Post on 08-Dec-2021
METHOD OF CONNECTION
DIRECT TO EXISTING SEWERAGE MAIN
TO SHAFT OF EXISTING MS or MC
PREFERENCETABLE 500-A: CONNECTIONS TO LIVE SEWERS. OPTIONS, REQUIREMENTS AND PREFERENCES
SITUATIONS OF USE AND COMMENTSDN100 & DN150 CONNECTIONS TO MAINS < 3.5m (PRIVATEPROPERTY) or < 4.0m DEEP (RD RESERVE OR PUBLIC OPEN SPACE)DN100 CONNECTION < 5m FROM EXISTING MS or MC
KEY REFERENCESTABLE 104A-A, MRWA-S-503
TABLE 104A-A, MRWA-S-305 & 306
TO SHAFT OR BASE OFEXISTING CONCRETE MH
TO BASE OF EXISTING PLASTICMAINTENANCE STRUCTURE
1
OFTEN DIFFICULT TO COMPLY WITH ALL MRWA-S-308REQUIREMENTS
TABLE 104A-A, MRWA-S-305, 306& 306B
2
ONLY IF UNUSED BASE INFLOW STUB IS CONFIRMED
HIGHLY FLEXIBLE SOLUTION WHERE MOST CONSTRUCTIONCAN USUALLY OCCUR WHILE THE SEWER REMAINS IN SERVICE
TABLE 104A-A, MRWA-S-307 to314, 508 & 510
TO BASE OR SHAFT OF NEWCONCRETE MH
3EXISTING FLOWS MUST BE CONTAINED DURINGCONSTRUCTION. SOMETIMES THE ONLY VIABLE SOLUTIONWHERE THERE IS LIMITED FOOTPRINT FOR A CONCRETE MH
TABLE 104A-A, MRWA-S-305,306, 306B & 512
TO BASE OF NEW PLASTIC STRUCTURE,OR SHAFT OF NEW PLASTIC MH
TABLE 104A-A, MRWA-S-308& 506
ACCEPTANCE TESTING REQUIREMENTS
PRESSURE / VACUUM TESTING NOTREQUIRED. VISUAL RECORD OF NEWCONNECTION (REFER TABLE 500-D).
PRESSURE / VACUUM TEST NEW CONNECTIONPIPEWORK IN THE SIGNED PRESENCE OF ANACCREDITED CONSULTANT OR WATERAGENCY AUDITOR, or
VISUAL RECORD OF NEW CONNECTION (REFERTABLE 500-D) AND STRUCTURE. THIS METHODIS TYPICALLY MORE PRACTICAL WHERE THEEXISTING ASSET IS IN POOR CONDITION
TABLE 500-D Notes:a. Still photographs shall be taken with a > 5MP pixel camera with sufficient light to ensure
images are clear whilst zoomed x10. Blurry and unclear images are not acceptable.b. All parts of a structure impacted by Live Sewer works shall be photographed so that all work
completed can be clearly observed.c. Still photograph the junction's internal bore by pointing the camera down the line of the
junction's offtake to verify that the full bore of the offtake is clear & unimpeded.d. Provide As Constructed visual records to Water Agency in accordance with their requirements.e. Where CCTV camera insertion is required, backfill as much of the new pipework as practical
while maintaining access to the end of pipe for CCTV camera insertion.At least one layer of backfill shall be placed over embedment up until 1m from end of pipe.Some CCTV footage of the backfilled pipe and extent of excavation shall be provided withinfootage of the pipe internals.
f. CCTV inspection shall be for the full length of new pipework.g. Push Rod CCTV camera reports shall list the size, type (crack, wrinkle, hole, gouge) and
severity of all defects (full WSA 05 report not required).h. Tractor CCTV report as per WSA 05, WSAA Conduit Inspection Reporting Code.
> DN150 & < 25m LONG
PUSH ROD CCTV PIPE INTERNALLY AFTER BACKFILL
STILL PHOTOGRAPH OF INTERNAL BORE OF JUNCTION &EXTERNAL PHOTOGRAPH OF EACH JOINT PRIOR TO BACKFILL
DN100 & > 3m LONG
RECORD REQUIREDSITUATIONTABLE 500-D: VISUAL RECORDING OF CONSTRUCTION
TRACTOR (CRAWLER) CCTV INTERNALLY AFTER BACKFILL> DN150 & > 25m LONG
DN100 & <3m LONG
PUSH ROD CCTV PIPE INTERNALLY AFTER BACKFILL
STILL PHOTOGRAPH(S) OF STRUCTURE INTERNALSSTRUCTURES
SIDE BOUNDARY
REAR BOUNDARY
DRIVEWAYDRIVEWAY
SIDE BOUNDARY
REAR BOUNDARY
DRIVEWAYDRIVEWAY
FRONT BOUNDARY
FIGURE 500-C1: BEFORE CONNECTION TO NEW STRUCTURE
FIGURE 500-C2: AFTER NEW MAINTENANCE STRUCTURE &CONNECTION & PIPE CONNECTION DECOMMISSIONING
FIGURE 500-D2: AFTER LARGERSTRUCTURE REPLACEMENT
FIGURE 500-D1: BEFORE ISREPLACEMENT
FIGURE 500-E2: AFTER LARGERSTRUCTURE REPLACEMENT
FIGURE 500-E1: BEFORE ISREPLACEMENT IN ROAD RESERVE
DRIVEWAY
DRIVEWAY
FRONT BOUNDARY
FIGURE 500-B1: BEFORE NEW PIPE CONNECTIONS
FIGURE 500-B2: AFTER NEW PIPE CONNECTIONS &REDUNDANT PIPE CONNECTION DECOMMISSIONING
NEW LIVE SEWERPIPE CONNECTION(REF MRWA-S-503)
NEW LIVE SEWERPIPE CONNECTION(REF MRWA-S-503)
DECOMMISSIONEDPROPERTY CONNECTION(REF MRWA-S-514)
NEW MAINTENANCESTRUCTURE (REFMRWA-S-508, 510 & 512)
HIGH STRENGTHFILLER (COMPO)
SIKADUR 31 (SIKA), NITOMORTAR EL-HB (PARCHEM),MEGAPOXY PM (VIVACITY), EPIREZ 633, DUO-BOND(DEKS), FERROPRE (HENKEL)
CONCRETE
GROUT
32 MPa PREMIXED or > 50 MPa BAGGED or COMPO
ACRYLIC, SBR or LATEX BONDING AGENTBONDING AGENT
HIGH FLOW, LOW SHRINKAGE CEMETITIOUS MATERIALeg: LIQUIFILL GRADE PC1 or RAPIDFILL A
SUPPLIER / SPECIFICATIONMATERIAL
ALL PREPARATION FOR AND APPLICATION OF MATERIALS SHALL COMPLY WITH THEMANUFACTURER'S INSTRUCTIONS
TABLE 500-B: LIVE SEWER WORKS MATERIALS
MORTAR TYPE M4, CONSTITUENTS AS PER TABLE 500-C
-
AS 1379
-
AS 1478.1
AS 3700
STANDARD
SAND 4.5
BUILDING LIME 0.5
1GP or GB CEMENTOPTION 1MATERIAL
TABLE 500-C: ACCEPTABLE MORTAR MIX PROPORTIONS
4
0
1
3
0 - 0.25
1
WATER THICKENER OPTIONAL YES OPTIONAL
AS 3972STANDARD
AS 1478.1
AS 1672.1
WSA PS 360
DECOMMISSIONEDPROPERTY CONNECTION(REF MRWA-S-514)
NEW MAINTENANCESTRUCTURE (REFMRWA-S-508, 510 & 512)
SIDE BOUNDARY
REAR BOUNDARY
FIGURE 500-A1: BEFORE NEWCONNECTION TO EX STRUCTURE
EX CONCRETE MH
FIGURE 500-A2: AFTER NEWCONNECTION TO EX STRUCTURE
SIDE BOUNDARY
REAR BOUNDARY
NEW CONNECTION(REF MRWA-S-506)
TYPICAL EXAMPLES OF LIVE SEWER ALTERATIONS
OPTION 2 OPTION 3
Surface Preparation & Placement of Materials:A. Prepare existing concrete and pipe for new concrete / Compo. Remove any
redundant items, hose down & scabble existing concrete to expose aggregate.Specialised scabbling tools shall be used for significant areas (ie: > 150 x 150).
B. Place Bonding Agent on all bonding surfaces to be concreted or mortar rendered.C. Fill redundant shaft inflow pipe or fix new pipe stub in place with Compo.D. Render any channel concrete to required geometry with mortar or Compo.E. Fill any redundant channel and base connection with concrete.F. If live flow in other channels can be maintained below the invert of the channel
being constructed or decommissioned, concrete or render may be placed byhand without the need for a retaining plate or flow isolation.Ensure no concrete enters a live channel.
G. If live flow in other channels will be above the invert of the channel beingconstructed or decommissioned, new concrete shall be formed against aretaining plate (refer Figure 516-E) set flush against the live flow channel surface.Alternatively the flow can be reduced or restricted.
TO SHAFT OF EXISTING PLASTIC MH TABLE 104A-A, MRWA-S-306B
TO SHAFT OF NEW MS or MC PRESSURE / VACUUM TESTING NOT REQUIRED.VISUAL RECORD (REFER TABLE 500-D).
TABLE 104A-A, MRWA-S-305,306 & 512
ONLY IF SUITABLE UNUSED CHANNEL IS CONFIRMED FOR DROP
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JUNE 2020JUNE 2020
PRE-PUBLISHED DRAFT1
2020 1CP / GA / NGJUN 20
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
LIVE SEWER WORKSMRWA-S-500
LEGEND:New Assert (black)
Existing asset (blue)
THIS LEGENDAPPLIES TO ALL500 SERIESSTANDARDS
· ALL WORKS SHALL BE UNDERTAKEN BY AN APPROPRIATELY ACCREDITED (APPROVED) LIVE SEWER CONTRACTOR· THE 500 SERIES STANDARDS DO NOT PROVIDE INFORMATION ON THE REHABILITATION OF SEWERS OR CONNECTIONS
CONDITION ASSESSMENT:1. "DEFECTIVE" is defined as having 8 or more points as per Appendix C of WSA 05. "SOUND" is not defective.2. Connect to or alter the height of existing assets which are in sound condition. Assess condition using one of the following:
2.1. Existing Pipe. Expose the pipe at location of work and visually inspect.If pipe is defective, expose more pipe and inspect (up to 1m in both directions or as far as practical).If this pipe is defective, insert push rod CCTV through a small hole (<30) in crown of pipe and inspect further.If work is abandoned due to poor pipe condition, patch hole with section of half pipe, Compo and then concrete in place.
2.2. Existing Pipe. CCTV inspect the main from a neighboring maintenance structure.2.3. Existing Maintenance Structure. Visually inspect, take visual records and survey any structure prior to works commencing.
3. Replace all joints and defective pipe within 300 of new pipe or new structures.4. Should a defective section of sewer not be able to be taken out of service or be too long to practically re-lay, contact the Water
Agency for advice. Typically a structural liner will be installed to rehabilitate the sewer prior to connection to the liner.
FRONT BOUNDARYFRONT BOUNDARY FRONT BOUNDARY
FRONT BOUNDARY
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JUNE 2020JUNE 2020
2020 1
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
PIPE CONNECTIONSMRWA-S-503
FIGURE 503-A: SS JUNCTION CLAMP
FLOW
TABLE 503-A: PROPERTY CONNECTION JUNCTION FITTINGS
STAINLESS STEEL 45° JUNCTION CLAMP,(unless conc embedment / encasement)
100 150 225 300 375 600525450 > 675
PVC DWV 45° JUNCTION (OB) - IN LINE FITTING
PVC, PP, GRP 45° JUNCTION (OB) - IN LINE
HOST PIPE
PVC DWV
PP
CONNECTION FITTING TYPESEWER STATUS
OUT OF SERVICE
PE
PVC DWV, PP,GRP, VC or CONC
DRY or LIVE SEWER
LIVE SEWER
ELECTROFUSION SADDLE JUNCTION 4 GRP GRP FABRICATED 45° JUNCTION (OB)- IN LINE
TYP NOT OKACCEPTABLE HOST DN
PROCESS STEP DESCRIPTIONSTEPAB
CD
E
F
H
I
TABLE 503-B: CLAMP / SADDLE JUNCTION INSTALLATION INSTRUCTIONS (assuming existing sewer in acceptable condition)
Place clamp or saddle correctly over hole so no host pipe surfacevisible looking through the branch opening (ie: no flow impedance)
Mark the outline of the branch's hole and the saddle perimeter,remove the mat / saddle and oversize the outline of the hole by 5mmusing a paint marker
Support the pipe so that it does not sag when the hole / coupon is cut
Ensure saddle / clamp matches the outside diameter of the host pipeLINING SADDLEMatch lining OD
N/A
Excavate pipe and determine the optimum location for junction.Keep junction 300 clear of pipe defects and pipe sockets / collars
Cut out the hole (using saber, hole or air saw, grinder), ensuringthat all cut out material, swarf and jagged edges are removedClean the pipe / clamp mat / saddle surfaces
G
Apply jointing compount (ref Table 503-C) to outside of hostpipe and saddle inside surfaces
If installing a saddle on a pipe lining, clear host pipe away from theliner equal to the saddle length plus ~150mm both sides of saddlePlace rubber mat from clamp or saddle junction over host pipe,orientating branch as required for TY1, 2 or 4 junction
J
K
SS CLAMP DWV SADDLE OTHER SADDLE PE SADDLE
Rotary peel bondingarea of PE pipe & cleanwith approved wipe
EXCEPTIONS / SPECIAL REQUIREMENTS
N/A N/A N/A N/A
N/A
Hold / fasten clamp / saddle firmly in place.Place temporary pipe (OD close fit to ID of saddle) down throughsaddle offtake and through hole in host pipe to keep saddle and hostmain holes aligned until jointing compound sets.
LM
N
Bolt halvestogetherandtightenfirmly
Fasten SS hoseclamps until bondingagent oozes fromsaddle. Cure epoxybefore loading.
Hold saddlefirmly on pipe for15 sec. Do notdisturb for 5 min
Clean off excess bonding agent from the inside surface of the pipeIf the hole is cut after fixing the saddle, cut out the hole through thebranch (using hole saw), ensuring that all cut out material, swarf andjagged edges are removedIf Type 2, support junction with concrete or cement stabilisedembedment. Remove pipe supports, place embedment & backfill.Test the property connection (as per Table 500-A if existing main)O
Strap saddle tomain in accordancewith themanufacturer'sinstructions
N/A N/A
FIGURE 503-C: PE ELECTROFUSIONSADDLE JUNCTION ON PE PIPE· Transition PE to DWV as per Figure 317-A.· For DN100 property connections, use a saddle
with DN110PE branch.· For DN150 property connections, use a saddle
with DN160PE branch.
Also chamfer insidediameter of PE branchto match DWV ID
REFERENCE
MRWA-S-302 to 304
MRWA-S-302 to 304
MRWA-S-302 to 304
FIGURE 503-C
LINER or DWV WITHCONC EMBEDMENT
FIGURE 503-D or EDWV SADDLE JUNCTION
VC or CONC WITHCONC EMBEDMENT
OUT OF SERVICE
OUT OF SERVICE
VC SADDLE JUNCTION
DEFECTIVE PIPE OUT OF SERVICE 45° JUNCTION (OB) AND MAKE UP PIECE
FIGURE 503-D: CONCRETE EMBEDDEDDWV, GRP, PP, VC or CONCRETE PIPE
FIGURE 503-F: CONNECTING TO PIPE WITH LOCAL DEFECTS (AFTER WORKS)
SOUNDEXISTING
PIPESOUND
EXISTING PIPE
DEFECTS >300
SOUNDEXISTING
PIPESOUND
EXISTING PIPE
>300
COUPLING OR CLAMP AS PERFIGURES 514-C to E
NEW PIPE
FIGURE 503-D
FIGURE 503-F
REMOVE SOCKET / COLLARIF WITHIN 300 OF DEFECTOR NEW JUNCTION FITTING
JUNCTION FITTING(AS ABOVE)
(BEFORE WORKS)IF NO JUNCTIONCOMPATIBLE WITHEXISTING PIPE, NEWPIPE & FITTING ASPER OPPOSITE SIDEMAY BE USED
LIVE SEWER INSTALL STRUCTURAL LINER & CONNECT FIGURE 503-E
EX CONCRETE
SMOOTHINTERNALPROFILE
EMBEDMENT
SADDLE
AS PER ROWS 1 to 3 ABOVE
DEFECTIVE PIPE
GRP WITH CONCEMBEDMENT
FIGURE 503-DOUT OF SERVICE orLIVE SEWER
GRP SADDLE JUNCTION
FIGURE 503-A & B
CONCRETE or CEMENT STABILISE IF:1) TYPE 2 CONNECTION, or2) IF PP PIPE + SS HALF CLAMP SADDLE
FIGURE 503-B: SS JUNCTION CLAMP ELEVATION
EMBEDMENT
ENSURE OFFTAKEPROTRUSION FITSWITHIN PIPE CUTOUT
CONCRETEOR CEMENTSTABILISEDIF TYPE 2CONNECTION
TABLE 503-C: SADDLE JOINTING COMPOUND & ADAPTATION TO DWV
PP
PIPE
GRP
FIGURE 317-A
ADAPTATION TO DWV
VC or CONCRETE
REDUCING JUNCTION CLAMP *ORDER SADDLE WITH DWV OFFTAKEHEPWORTH SA9 or SA10 ADAPTOR
PE
PVC STUB
JOINTING COMPOUND(REF TABLE 503-C)
SILICON SEALANT
JOINTING COMPOUND
SIKADUR 31 or MEGAPOXY PMCOMPO
ELECTRO-FUSION WELD
DWV NAPRIMER & SOLVENT CEMENT
DWVBEND
ADAPTOR
NOTES Regarding Table 503-A & B:1. Denotes only DN100 offtake available.
Denotes that DN100 and DN150 branches are acceptable and available.2. The terms "OUT OF SERVICE" and "DRY" are interchangeable.3. > DN225 branches are not acceptable.4. All junction fittings are to connect at 45° to the upstream line.5. For PE Electrofusion saddles, use 45° wastewater EF saddles where available. Otherwise use 90°large bore EF branch saddles.6. For Type 2 saddle or clamp connections, support all saddle and clamp offtakes with concrete or cement stabilised bedding to
prevent vertical loads rotating the offtake. Place between underside of offtake and extend down to native soil. Refer Figure 503-B.
SS316 HOSE CLAMPS(DEKS INDUSTRIES)
FIGURE 503-E:DWV SADDLE JUNCTION ON SEWER LINING
PVC SADDLE, Ø TOSUIT LINING OD
SIKADUR 31 orMEGAPOXY PM
<150
CLEAR HOSTMAIN 150FROM LINER
OUT OF SERVICE orLIVE SEWER
OUT OF SERVICE orLIVE SEWER
INSTALL JOINTING COMPOUNDS IN ACCORDANCE WITH MANUFACTURER'S INSTRUCTIONS.
<300
<300
ENSURE CLAMP 300 CLEAROF JOINTS AND DEFECTS
FLOW
SS
SADDLE
GRP + DWVVC
PE
DWVNALINER DWV SIKADUR 31 or MEGAPOXY PM
* REMOVE BOTTOM HALF OF CLAMP, PLACE TOP HALF OF CLAMP WITH OFFTAKE & CONCRETE IN PLACE
PLACE CONCRETE OR CEMENT STABILISED EMBEDMENTUNDER OFFTAKE AS INDICATED IN FIGURE 503-B
TYPE 2ALIGNMENT
TYPE 1 or 4ALIGNMENT
ENSURE SADDLE 300 CLEAROF JOINTS AND DEFECTS
EX SOCKET / COLLAR CANBE RETAINED IF >300 FROMNEW PIPE
FIGURE 506-C1: EXISTINGCONCRETE MH SHAFT
FIGURE 506-H2: PREPARATION FOR BASECONNECTION WITHIN EX MH BASE
FIGURE 506-D2: PREPARATION FORDROP BEND WITHIN EX MH BASE
TEMPORARYCHANNEL ENCLOSURE
FIGURE 506-I2: PREPARATION FOR BASECONNECTION ABOVE EX MH BASE
NEW
SHA
FT C
ONNE
CTIO
NS T
O EX
ISTI
NG C
ONCR
ETE
MHs
NEW
BAS
E CO
NNEC
TION
S TO
EXIS
TING
CON
CRET
E MH
s
FIGURE 506-D1: EXISTINGCONCRETE MH BASE
FIGURE 506-E1: EXISTINGCONCRETE MH BASE
FIGURE 506-H1: EXISTINGCONCRETE MH BASE
FIGURE 506-I1: EXTENDEDEXISTING CONCRETE MH BASE
CONNECT PIPE TO SHAFTAS PER FIGs 310-D to G
COMPO IN PLACEAS PER TABLE 500-B
DROP PIPE BRACKETSAS PER FIG 314-IDROP PIPE, BENDS & CHANNELAS PER FIG 311-C to E
FIGURE 506-C2: PREPARATION,MH SHAFT CONNECTION
FIGURE 506-E2: PREPARATION FORDROP BEND ABOVE EX MH BASE
SCABBLE ALLSURFACES WHICH WILLBE IN CONTACT WITHNEW CONCRETE
BREAKOUT, BETWEEN 50 & 75 LARGERIN DIAMETER THAN FUTURE PIPE STUB
PROVIDE ROUGH SURFACE:1) PLUG & FEATHER, or2) DRILL SERIES OF HOLES & BREAKOUT, or3) CORE DRILL & SCABBLE SURFACE(JACK HAMMERING NOT ALLOWED)
FIGURE 506-H3: FINAL ARRANGEMENT FORBASE CONNECTION WITHIN EX MH BASE
FIGURE 506-D3: FINAL ARRANGEMENTFOR DROP BEND WITHIN EX MH BASE
FIGURE 506-I3: FINAL ARRANGEMENT FORBASE CONNECTION ABOVE EX MH BASE
FIGURE 506-C3: FINAL ARRANGEMENTMH SHAFT CONNECTION
FIGURE 506-E3: FINAL ARRANGEMENTFOR DROP BEND ABOVE EX MH BASE
>750
CONCRETEELEVATED
TABLE
CONCRETE ELEVATED TABLE TOREQUIRED DIMENSIONS & FINISH
MORTAR RENDER CHANNEL TOREQUIRED DIMENSIONS & FINISH
MECHANICAL REMOVALOF BASE TO CREATEPENETRATION & CHANNEL
BREAKOUT SHAFTAS PER FIG 506-C2
SCABBLE ALL SURFACESTO BE CONCRETED
COMPO PIPESTUB IN PLACE
MECHANICAL REMOVAL OFBASE TO CREATE CHANNEL
COMPO PIPE STUB IN PLACE
MORTAR RENDER TOREQUIRED CHANNEL
DIMENSIONS & FINISH
CONNECT PIPETO BASE AS PER
FIGs 310-D to G
CONNECT PIPETO BASE AS PERFIGs 310-D to G
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JUNE 2020JUNE 2020
2020 1
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
NEW CONNECTIONS TOEXISTING CONCRETE MHs
MRWA-S-506
Connection to Shafts / Risers of Existing MHs:1. New shaft connections shall comply with MRWA-S-311.2. Drop pipes shall discharge with the following preference:
2.1. Into a new channel formed in the existing base (refer Figure 506-D).Provide a compelling reason to the Water Agency if this is not practical:
2.2. Into a channel formed within an elevated table (refer Figure 506-E).Provide a compelling reason to the Water Agency if this is not practical:
2.3. Into an existing live sewer channel, preferably at the downstream end of themain channel.
Connection to Base of Existing MHs:a. New base connections shall comply with MRWA-S-308 & 310.b. Designer shall specify whether connection level can be elevated to enable Fig 506-I option.c. Option described by Figure 506-I requires Water Agency approval.
Submit photo evidence to the Water Agency that the existing concrete base extends > 750 beyond MH shaft.
General Requirements:A. Inspect the structure or any pipe stub being connected to so as to obtain
geometric and condition information. Ref MRWA-S-500.B. Assess whether it would be better to connect to an existing maintenance
structure or construct a new structure over the existing sewer.Provide justification to the Water Agency for any decision.
C. Provide a detailed design as per MRWA-S-308 for all changes to existingMHs and new MHs on live sewers. All of the requirements detailed inMRWA-S-308 shall apply to alterations to existing concrete MHs.
D. Selection and application of all materials shall be as per MRWA-S-500.E. Where penetrations are to be made to existing shafts or where new
channels are to be formed in existing bases, implement measures to captureall debris and prevent this from entering the sewer. Existing channels shallbe covered or temporary pipes placed in existing channels.
F. Where tables are elevated, ladders or step irons shall be modified toconform to MRWA-S-314.
G. Where unused stubs are being connected to, new pipe connecting to thestub shall be of the same material as the stub. Inspect existing stubs toconfirm material.
FIGURE 506-A: BEFORENEW CONNECTION
EXI
STIN
G SE
WER
EX MH
FIGURE 506-B: AFTERNEW SHAFT CONNECTION
EXI
STIN
G SE
WER
NEWSHAFTCONNECTION
-
-3
-
FIGURE 506-F: BEFORENEW CONNECTION
EXI
STIN
G SE
WER
EX MH
FIGURE 506-G: AFTERNEW BASE CONNECTION
EXI
STIN
G SE
WER
NEWBASECONNECTION
-
-3
-
LEGEND:New Assert (black)
Existing asset (blue)
EX MH
EX MH
PIPE Ø +50 to 75
EXISTING BASE
NEWCHANNEL
· The existing pipe shall not be broken into until as much of the MH has beenconstructed as possible.
· While it remains unbroken, the excavation may or not be a confined space.Decision shall depend on possibility of hazardous atmosphere and the age, typeand condition of pipe.
1. Excavate and expose the pipe where MH is to be constructed.2. Identify the most appropriative location for the new MH.
Ensure pipe at and around new MH is in sound condition, preferably straight withas few joints as possible.
3. Thoroughly clean pipe to be encased and where MH encasement is to occur:3.1. If PVC DWV- prime the pipe before applying solvent cement fully around
the pipe. Sprinkle builders sand liberally to the solvent cement while soft.Allow to harden before concreting.
3.2. If PP, VC or CONC- applying a circular 2 thick Hydrotite bandage 75 backfrom where the pipe crown will be removed.
3.3. If GRP- sand the pipe with coarse sand paper. Then apply polyester resinto abraded surface and sprinkle builders sand liberally to resin while soft.Allow to harden before concreting.
4. Place polystyrene blockout above the existing pipe and for any new lateralconnection chase / channel as per Figure 508-D1 and E1.
5. Place steel reinforcement for base as per Table 310-B. Mesh may be difficult toplace, in which case place equivalent bars as much as practical.
6. Install formwork required in preparation for placement of concrete for the base.7. Pour the in-situ cast base including nib wall and starter bars in accordance with
MRWA-S-310.8. Pour the wall segments and shaft connections (if present) as per MRWA-S-311.
9. Pour the MH top and set cover and frame as per MRWA-S-313 & 313B.10. Fix ladder / step irons / landings / drop pipe as per MRWA-S-314.11. Remove the polystyrene blockout from the base. Recommended lateral channel
block out foam be removed first & side channel inspected & rendered as requiredbefore live channel blockout foam and crown are removed.
12. Vacuum test the new MH and new connection pipework (refer Table 500-A).13. Cut out the top of the pipe (crown) as per Figure 508-D3.14. Cut out the side of the existing pipe to allow the new lateral channel to enter the
main channel as per Figure 508-E3.15. Render the top edges of the cut pipe and any gap between pipe and base with
Compo (refer Table 500-B) in accordance with Figure 508-D4 & E4.16. Once the MH walls have set sufficiently, backfill in accordance with the MRWA
Backfill Specification MRWA-04-03.
Concrete Maintenance Hole Construction Over Existing Sewers:
FLOW THROUGH FOAMBLOCKOUT
REQUIRE SHORT FLOW ISOLATION(SUITABLE FOR SMALL FLOWS)
REQUIRE SECTION OF SOUND PIPEIN A SUITABLE LOCATION
CONSTRUCT OVEREXISTING SEWER
LIMITATION / OUTCOMEOPTION (IN ORDER OF PREFERENCE)TABLE 508-A: FLOW MANAGEMENT & CONSTRUCTION OPTIONS
2A
1
3 BYPASS PUMPING MORE COSTLY AND RISKY
4
CONSTRUCT OVER NEWSECTION OF REPLACED PIPE
FIG 508-D & E,MRWA-S-510
REFERENCE
PIPE
FOAM BLOCKOUT
FIGURE 508-D1: PREPARATION: AWAY FROM LATERAL CONNECTION
PIPENEW BASECONCRETE
FIGURE 508-D2: BASE CONCRETE IN PLACE, AWAY FROM LATERAL CONNECTION
PIPE
FIGURE 508-E1: PREPARATION, AT LATERAL CONNECTION
PIPE
FIGURE 508-E2: BASE CONCRETE IN PLACE, AT LATERAL CONNECTION
FOAMBLOCKOUT
NEW BASECONCRETE
CUTCUT
FIGURE 508-D3: CUT OUT EXPOSED PIPE FIGURE 508-D4: RENDER TOP EDGE OF CUT PIPE
COMPO
CUT
FIGURE 508-E3: CUT OUT EXPOSED PIPE FIGURE 508-E4: RENDER TOP EDGE OF CUT PIPE
CUTCOMPO
FIGURE 508-A: OPTION 1, PLAN VIEW
EXI
STIN
G SE
WER
NEWMH
NEWLATERALCONNECTION
-
B
-
A
-
GENERAL REQUIREMENTS:A. Comply with Confined Space entry requirements of the Water Agency throughout the works.B. Submit Work Method Statement if this has been requested by the Water Agency.C. This standard is applicable to both new shaft and new base connections to concrete MHs constructed around an existing sewer.
Refer MRWA-S-311 for new shaft connection and MRWA-S-310 for new base connection requirements.D. Excavate down to and around pipe where the MH is to be constructed, ensuring that the main is stable and not damaged.E. Assess the condition of the pipe in accordance with MRWA-S-500, note 2. Construct around existing pipe in sound condition.
The new MH may need to be constructed in an alternate location or the pipe replaced (ref Option 2C) or rehabilitated prior to work.F. Construct concrete MHs in accordance with MRWA-S-307 to 317 as much as practical.G. Once the MH walls have cured sufficiently, backfill in accordance with the MRWA Backfill Specification MRWA-04-03.
OPTION 1SECTION A
FIGURES (INCHRONOLOGICAL
SEQUENCE)
OPTION 1SECTION B
FIGURES (INCHRONOLOGICAL
SEQUENCE)
GRAVITY BYPASS NOT TYPICALLY PREFERRED
OPTION 2B FIGURES IN
CHRONOLOGICALSEQUENCE
FIGURE 508-F1: FOAM BLOCKOUT WITHINTERNAL FLOW THROUGH PIPE
FIGURE 508-F2: FOAM BLOCKOUT
NEW BASECONCRETE
FIGURE 508-F3: BASE CONCRETE IN PLACE, AWAYFROM LATERAL CONNECTION (THROUGH SECTION A)
FIG 508-F
FIG 512-I & J
-
-
DWV PIPE THROUGH FOAMBLOCKOUT FOR SEWAGETO PASS THROUGHDURING CONSTRUCTION
FIGURE 508-F4: BASE CONCRETE IN PLACE, ATLATERAL CONNECTION (THROUGH SECTION B)
NEW BASECONCRETE
FIGURE 508-C: NEW MH BASE INSTALLED OVER EXISTING PIPE
NEW LATERALCHANNEL
FIGURE 508-B: EXISTING PIPE OVER WHICH CONCRETE MH WILL BE CONSTRUCTED
FOOTPRINT OFPIPE CROWN TOBE REMOVED
RELEVANT TO ALL OPTIONS SHOWN IN MRWA-S-508 to 512
PIPE SURFACE TO BEPREPARED FOR CONCRETE
PIPE SURFACE TO BEPREPARED FOR CONCRETE
SHAFT OR BASECONNECTION
INSTALL PREFABRICATEDMAINTENANCE STRUCTURE
FIG 512-D,F & L
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JUNE 2020JUNE 2020
2020 1
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
LIVE SEWER CONCRETE MH CONSTRUCTIONMRWA-S-508
PIPE
FOAMBLOCKOUT
ALTERNATIVE BLOCKOUT PROFILE IFCHANNEL FOR SHAFT CONNECTION
PIPE STUB AS PERFIGs 310-D to G IFBASE CONNECTION
STEELREINFORCEMENT,BARS WIRED INPLACE WHEREPRACTICAL
>150
NOTE: ONE OF 3 MH CONNECTORS NOT YET PLACED
2B
2C
MAINTAIN CONCRETEHAUNCH UNDER PIPEIF PRACTICAL
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JUNE 2020JUNE 2020
PUBLISHED FIRST ISSUE
2020 1
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
LIVE SEWER CONCRETE MHCONSTRUCTION, CONCRETE ENCASED
MRWA-S-510
PIPE
EX CONCRETE
FOAM BLOCKOUT
>75
~2 3 PIP
E Ø
FIGURE 510-B1: PREPARATION,DEEP CONCRETE EMBEDMENT
DOWEL
PIPE
EX CONCRETE
FOAM BLOCKOUT
FIGURE 510-C1: PREPARATION,EXPOSED CONCRETE EMBEDMENT
PIPE
EX CONCRETE
NEW BASECONCRETE
FIGURE 510-C2: BASE CONCRETE IN PLACE
~1 3 PIP
E Ø
PIPE
EX CONCRETE
>75
~2 3 PIP
E Ø
FIGURE 510-B2: BASE CONCRETE IN PLACE
DOWEL
~1 3 PIP
E Ø
PIPE
EX CONCRETE
FIGURE 510-D1: PREPARATION, CONCRETE ENCASEMENT FIGURE 510-D2: BASE CONCRETE IN PLACE
PIPE
EX CONCRETENEW BASE
PIPE
FOAMBLOCKOUT
FIGURE 510-E1: PREPARATION, DEEP CONCRETEEMBEDMENT AND SMALLER LATERAL CONNECTION
SMALLER SEWER INVERT
PIPE
FIGURE 510-F1: PREPARATION, DEEP CONCRETEEMBEDMENT AND LARGER LATERAL CONNECTION
ELEVATED LARGERSEWER INVERT
PIPE
FIGURE 510-F2: BASE CONCRETE IN PLACE, CONCRETEEMBEDMENT AT LATERAL CONNECTION
ELEVATEDSEWER INVERT
ELEVATED TABLE LEVEL
EX CONCRETE
EX CONCRETE EX CONCRETE
PIPE
FIGURE 510-E2: BASE CONCRETE IN PLACE
NORMAL TABLE LEVEL
EX CONCRETE
FOAMBLOCKOUT
SMALLER SEWER INVERT NEW BASE
NEW BASE
PIPE
EX CONCRETE
FIGURE 510-G1: PREPARATION, CONCRETEENCASEMENT, AWAY FROM LATERAL
FIGURE 510-G2: PREPARATION, CONCRETEENCASEMENT, AWAY FROM LATERAL
EX CONCRETENEW BASE
PIPE
ELEVATEDTABLE LEVEL
CONSTRUCTION DETAILS, SECTION A OPTIONS(AWAY FROM LATERAL CONNECTION)
CONSTRUCTION DETAILS, SECTION B(DROP OR BASE LATERAL CONNECTION)
Concrete Embedment (Figures 510-B, C, E & F):1. Drill a pilot hole through concrete embedment / encasement to confirm thickness and condition of embedment.2. Ensure concrete is able to withstand dowel insertion and scabbling without fracturing. Remove all weak material or if most concrete is
weak, remove all concrete embedment. Concrete removal method shall take into account the condition of the existing pipe and thedegree to which it can withstand vibration and impact.
3. Scabble all existing concrete surfaces which will bond with new concrete until aggregate exposed.4. Place dowels as shown at 200 spacing for the length of the new MH, ensuring that all dowels will have > 75 clear cover once concreted in
place as per Figure 510-B1 and dowels > 75 from the pipe.Dowel thickness as per Table 310-B. Insert into the existing concrete with adhesive capsule chemical anchors. Keep dowels >75 clear ofany new lateral channel connection.If concrete thickness is less than half pipe Ø, reduce the penetration of the dowels to ensure they have adequate clear cover underneath.
5. Where the concrete is in good condition, shallow and structurally sound enough to safely excavate underneath the embedment, prepareas per Figure 510-C1.5.1. Support pipe against deflection due to weight of concrete where required (ie: if flexible pipe).5.2. Place base N16 x 200 reinforcement bars at 45° and 135°to the sewer as much as practical.
6. Place foam blockout at lateral connection if channel required for shaft connection with drop pipe, as per Figure 510-E1.7. Place foam blockout and stub pipe at lateral connection if channel required for a base connection, as per Figure 510-F1.8. Prepare concrete surface and place materials as per Figures 510-B, C, E and F and MRWA-S-500 and 508.9. Remove blockout and pipe crown as per Figure 508-D3 and E3, ensuring no material falls into the live channel.10. Trim all edges and smooth rough edges with Compo as per Figures 508-D4 and E4.
Concrete Encasement (Figures 510-D & G):Connection to a concrete encased sewer requires Water Agency approval and shall only be undertaken where there is no practical alternative.Approval will depend on the contractor having a sound methodology to prevent debris entering the sewer.A. Excavate down to string line of the encasement and drill a dowel hole to confirm condition of concrete.B. Ensure concrete able to withstand dowel insertion and scabbling without fracturing.C. Remove all weak material or if most concrete is weak, remove all concrete encasement. Concrete removal method shall take into account
the condition of the existing pipe and the degree to which it can withstand vibration and impact.D. Remove concrete encasement for lateral connection as per Figure 510-G1.
Refrain from removing concrete from the haunch of the pipe, even if that means elevating the lateral inflow channel.E. Scabble all existing concrete surfaces which will bond with new concrete until aggregate exposed.F. Place dowels as shown at 200 spacing for the length of the new MH, ensuring that all dowels will have > 75 clear cover once concreted in
place and are > 75 from the pipe as per Figure 510-D1. Dowel thickness as per Table 310-B.Insert into the existing concrete with adhesive capsule chemical anchors. Keep dowels >75 clear of any new lateral channel connection.Dowels are shown in the below figures as horizontal, but may be angled upwards to as much as 45 deg from horizontal.
G. Place foam blockout at lateral connection if channel required for shaft connection with drop pipe.H. Place foam blockout and stub pipe at lateral connection if channel required for a base connection.I. Prepare concrete surface and place materials as per Figures 510-D & G and MRWA-S-500 and 508.J. Remove blockout and pipe crown as per Figure 508-D3 and E3, ensuring no material falls into the live channel.K. Trim all edges and smooth rough edges with Compo as per Figures 508-D4 and E4.
NEW BASECONCRETE
>150
REMOVE EXCESS CONCRETEAND PIPE CROWN AS PER FIG508-D3 and D4
ELEVATED TABLE LEVELSCABBLE SURFACE OF ALL EX CONCRETETO CONTACT NEW CONCRETE
CUT
CUT
CUT
REMOVE EXCESS CONCRETE ANDPIPE CROWN AS PER FIG 508-E3 & E4
SCABBLE SURFACEOF ALL ACCESSIBLEEX CONCRETE TOCONTACT NEWCONCRETE
SCABBLESURFACE OFALL ACCESSIBLEEX CONCRETETO CONTACTNEW CONCRETE
BLOCKOUT PROFILE IF CHANNEL FORSHAFT CONNECTION DROP BEND
PIPE STUB AS PER FIGs 310-D to G
FOAM BLOCKOUT FORNEW SEWER INFLOW SAME
Ø AS EXISTING SEWER
FOAM BLOCKOUT FORNEW SEWER INFLOW SAME
Ø AS EXISTING SEWER
ELEVATE LATERALSEWER SO EX
CONCRETE UNDERHAUNCH LEFT IN PLACE
PIPE STUBNOT SHOWNFOR CLARITY
ELEVATE LATERALSEWER SO EX
CONCRETE UNDERHAUNCH LEFT IN PLACE
~23 PIPE Ø
~13 PIPE Ø
> 75
FIGURE 510-A: PLAN VIEW E
XIST
ING
SEW
ER
NEWMH
-
B
-
A
-
FOOTPRINT OF PIPECROWN TO BEREMOVED
NEW SHAFTOR BASECONNECTION
MECHANICAL REMOVAL OFCONCRETE ENCASEMENTFOR NEW LATERAL CHANNEL
(INTERNAL DROP CONNECTION AND SHALLOW CHANNEL SHOWN)
(BASE CONNECTION AND DEEP CHANNEL SHOWN)
DOWEL
NOTES Regarding Inserting Plastic Structures into Existing Sewers:· This type of installation may only be used where:·· Flows can be contained without significant risk.·· The host sewer is not lined.
· Plastic structures with flexible RRJ connectors are recommended.· Comply with the Water Agency's confined space entry requirements at all times.· Undertake installation as follows:
1. Submit Work Method Statement if this has been requested by the Water Agency.2. Excavate down to and around the pipe where the plastic structure is to be constructed.
3. Minimise the amount of pipe embedment removed around the existing pipe.4. Prepare the base in accordance with MRWA-S-305, 306 & 306B.5. Stop sewer flow from entering the main to be cut.6. Place a band around the existing pipe to mark straight cut lines where the pipe is to be cut.7. Cut (+/- 3 mm from straight circumferential line) and dry the main.8. Place plastic structure with pipe extension(s) and lubricated couplings (if coupling).9. Pull back couplings or place clamps over joins, ensuring fitting is centered over the gap.10. Install remaining items, place embedment and backfill as per MRWA-S-305, 306 & 306B.
FIGURE 512-D: NEW PLASTIC STRUCTUREINSTALLED INTO EXISTING SEWER
FIGURE 512-H: EXAMPLE OF STRUCTURE TO BE REMOVED INPREPARATION FOR MH AND LARGER CONNECTION (ELEVATION)
PREPARED PIPESURFACE (REF
NOTE 3 OFMRWA-S-508)
FIGURE 512-I: REPLACE DEFECTIVE OR REMOVEDSTRUCTURE WITH SECTION OF NEW SEWER
(REFER MRWA-S-508 & 510 FOR CONSTRUCTION DETAILS)
FIGURE 512-G: EXAMPLE OF DEFECTIVE PIPE AT LOCATIONWHERE NEW CONCRETE MH IS TO BE CONSTRUCTED (ELEVATION)
FIGURE 512-J: INSTALL CONCRETE MH OVER NEW SECTION OF SEWER(REFER MRWA-S-508 & 510 FOR CONSTRUCTION DETAILS)
FIGURE 512-B: EXAMPLE OF DEFECTIVE PIPE WHERE NEW PLASTICMAINTENANCE STRUCTURE IS TO BE INSTALLED (ELEVATION)
FIGURE 512-A: EXISTING PIPE WHERE NEW PLASTIC MAINTENANCESTRUCTURE IS TO BE INSTALLED (ELEVATION)
FIGURE 512-C: EXAMPLE OF STRUCTURE TO BE REMOVED IN PREPARATION FORPLASTIC MAINTENANCE STRUCTURE INSTALLATION (ELEVATION)
SLIP COUPLING, FLEXIBLECOUPLING, OR CLAMP(REFER FIGURES 514-C to E)
FIGURE 512-E: EXAMPLE OF STRUCTURE TO BE REMOVED INPREPARATION FOR MH AND LARGER CONNECTION (ELEVATION)
FIGURE 500-F: NEW PLASTIC MH WITHLARGER SHAFT CONNECTION
FIGURE 512-L: LARGER CONNECTION TO NEW PLASTICSTRUCTURE ON AN EXISTING SMALL SEWER
DN225 CHANNEL
NEW PLASTICSTRUCTURE
DN22
5CH
ANNE
L
NOTE: DISPENSATIONREQUIRED
SLIP COUPLING, FLEXIBLE COUPLING,or CLAMP (REFER FIG's 514-C to F)
ECCENTRIC REDUCER(COMMON INVERT)
ECCENTRICREDUCER(COMMONINVERT)
EXISTINGDN150SEWERPIPE
EXISTINGDN150SEWERPIPE
NEW
DN2
25CO
NNEC
TION
FIGURE 512-K: LARGER CONNECTIONS TO NEW CONCRETEMH ON AN EXISTING SMALLER SEWER
(REFER MRWA-S-508 & 510 FOR CONSTRUCTION DETAILS)
NEW DN225CONNECTION
EX
DN15
0 SEW
ER
NEW CONCRETE MH
NEWCHANNEL
NOTE:DISPENSATIONREQUIRED
General Notes:· "DEFECTIVE PIPE" is defined as having 8 or more points as per Appendix C of WSA 05- Conduit Inspection Code.· While existing sewer is shown as brown (indicating VC pipe), the existing pipe may be of any type.· To make a new shaft connection to an existing plastic maintenance structure, excavate to the new shaft connection level and
install shaft connection as per MRWA-S-305, 306 & 306B. Some brands will require that the entire top section of structure beremoved and a shaft coupler added. Some brands will enable a shaft connection to be made to an existing shaft.
SLIP COUPLING, FLEXIBLECOUPLING, OR CLAMP(REFER FIGURES 514-C to F)
SLIP COUPLING, FLEXIBLECOUPLING, OR CLAMP(REFER FIG's 514-C to F)REFER MRWA-S-305,
306 & 306B FORPLASTIC STRUCTUREINSTALLATION DETAILS NEW SHAFT
CONNECTION
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JUNE 2020JUNE 2020
2020 1
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
LIVE SEWER MAINTENANCE STRUCTUREINSTALLATION EXAMPLES
MRWA-S-512
>2 xPIPEØ
>2 xPIPEØ
>2 xPIPEØ
NEW PIPE
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JUNE 2020JUNE 2020
2020 1
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
REPAIR OF SEWERSAND DECOMMISSIONING
OF SEWER PIPE CONNECTIONS
MRWA-S-514
NEW MAKE-UP PIPE
FIGURE 514-C: PIPE INSERTION USING FLEXIBLE COUPLINGS
TYPE B, STRAUB or REHAU AWADUCTFLEX-CONNECT COUPLINGSCENTERED ON JOINT, AS PER FIG 514-E
SOUNDEXISTING
PIPE
SOUNDEXISTING
PIPE
MINLENGTH
300
5 MAX GAP REINSTATE BEDDING
NEW MAKE-UP PIPE
FIGURE 514-D: PIPE INSERTION USING SLIP COUPLINGS
SLIP COUPLINGSCENTERED ON JOINT
SOUNDEXISTING
PIPE
SOUNDEXISTING
PIPE
MINLENGTH
300
5 MAX GAP REINSTATE BEDDING
NOTES Regarding Couplings, Clamps & Make Up Pieces:· Any makeup piece shall have the same ID as the host main +/-5.· Chamber internal protruding edges to ensure smooth transition through make up piece.· Ensure the sealing range of the selected product can accommodate the outside
diameter of both the existing main and make up piece as per Figure 514-E.· Slip couplings and clamps may only be used where the make up piece and existing host
main have the same outside diameter (+/- 1). Refer Figure 514-D & F: .· Clamps and couplings shall not be used in the construction of new pipelines.· Profiled repair clamps and joining clamps for insertion of pipe sections into profiled wall
pipe (ie: PP pipe) are available from the relevant manufacturer.· Ensure clamps overlap existing pipe as per Table 514-C.
MIN CLAMP LENGTH EITHER SIDE OF GAP
75
125
PIPE DN< DN375> DN450
TABLE 514-C: CLAMP OVERLAP
Option 2 Procedure- Pipe Insertion:1. Submit Work Method Statement if requested by the Water Agency.2. Minimise the amount of pipe embedment removed around existing
pipe.3. Inspect the pipe and determine its structural integrity. Only bridge
between existing pipe in sound condition with no defects.4. Expose as much as 3m of pipe in an attempt to find pipe of
acceptable condition.Where pipe of satisfactory condition cannot be found within that 3m,contact the Water Agency for advice. Typically the pipe insertionworks will need to be delayed or canceled as full pipe rehabilitationoptions will need to be considered.
5. Stop sewer flow from entering the main (plug upstream sewer).6. Place a band around existing pipe and mark straight cut lines (+/- 3
from straight).7. Obtain confined space permits and prepare for confined space entry
if this has not already been done.7. Cut the main and remove redundant pipework.8. Cut an insertion piece, ensuring gaps will be < 5 wide and that the
difference in ID is less than 5.9. Chamfer any protruding internal edge and ensure a smooth
transition.10. Clean outside surfaces of insertion piece and beyond each of the
existing pipe ends and lubricate if RRJ couplings are being used.11. Place a coupling over each existing pipe end (unless clamps used),12. Insert pipe piece and pull back couplings or place clamps over joins,
ensuring fittings centered over gaps.13. Embed and backfill as per MRWA-S-201 and 202.
NEW MAKE-UP PIPE.> 2 x CLAMP LENGTH
FIGURE 514-F: PIPE INSERTION USING CLAMPS
CENTER CLAMPSON JOINTS
SOUNDEXISTING
PIPE
SOUNDEXISTING
PIPE
MINLENGTH
300
5 MAX GAP REINSTATE BEDDING
FIGURE 514-A: MECHANICAL INSERT ARRANGEMENTS
SOUNDEXISTING
PIPE
SOUNDEXISTING
PIPE
POSSIBLE JUNCTION OFFTAKEMECHANICAL INSERT
POSSIBLEDEFECT >150
CENTRE INSERT AT CENTREOF DEFECT / OFFTAKE
>1mBACKFILL
DEFINITION
SHALLOW
SHALLOW
DEPTH
YES
YES or NO
TABLE 514-B: DEPTH DEFINITIONS
NO DEEP
2
1
3
< 3.5m DEEP
< 2.0m
> 2.0m DEEP
~5 ton EXCAVATOR ACCESS
YES or NO DEEP4 > 3.5m DEEP
>150
FIGURE 514-B: PATCH LINER ARRANGEMENTS
SOUNDEXISTING
PIPE
SOUNDEXISTING
PIPE
POSSIBLE JUNCTIONOFFTAKE APPROVED PATCH LINER
POSSIBLEDEFECT
>200 >200
~1000
CENTRE INSERT AT CENTREOF DEFECT / OFFTAKE
SITUATION OF USE
UNPAVED SHALLOW CONNECTIONS / DEFECTS and FLOW ISOLATION PRACTICAL
PAVED or DEEP CONNECTIONS / DEFECTS or EXCAVATION IMPRACTICALOPTION
FIG 514- C to F
FIG 514- A or B
TABLE 514-A: REPAIR / CONNECTION DECOMMISSIONING OPTIONS
FIG 514- G, H or I UNPAVED SHALLOW CONNECTIONS / DEFECTS and FLOW ISOLATION IS IMPRACTICAL
2
1
3
PIPE REPLACEMENT
INSERT / LINER
CAP CONNECTION
REFERENCE
· "PAVED" includes all surfaces which are not soil or gravel (eg: concrete, bitumen, paving etc).· Option 3 requires Water Agency approval.· "DEFECTS" or "DEFECTIVE PIPE" is defined as having 8 or more points as per Appendix C of WSA 05.
OPTION 1: MECHANICAL INSERT or PATCH LINER
OPTION 2: PIPE REPLACEMENT
OPTION 3: CAP CONNECTION
FIGURE 514-G: TYPE 2 CONNECTION CAP
Option 3 Procedure- Cap Connection :a. Excavate down to section of straight property connection
pipe nearest the junction fitting or concrete encasement.b. Cut this straight pipe within 100mm of the junction fitting,
junction bend or concrete encasement.c. Inspect inside the junction fitting & bend (with push rod
CCTV if necessary) from this location to confirm they arein sound condition (no cracks, defects and offtake doesnot protrude into reticulation main).Undertake Option 1 or 2 where a defect is observed.
d. If PVC DWV pipe, SCJ weld a cap to the cut end , orIf VC pipe, place a Fernco QwikCap or HepworthStopper at cut end.
e. Place concrete to 100 above the cap.f. Backfill any excavation in accordance with the MRWA
Backfill Specification.
<100
BACKFILL
CAP
NEW CONCRETE
UNPAVED SURFACE
EXCA
VATI
ON E
DGE
EX CONCRETEEMBEDMENT
>100
FIGURE 514-H: TYPE 1 or4 CONNECTION CAP
FIGURE 514-I: CONCRETEENCASED CONNECTION CAP
<100
>100
>100
<100
NEWCONCRETE
NEW CONCRETE
< 2.5
4
5
°
FIGURE 514-E: COUPLINGARRANGEMENTS
PIPE COUPLING
FLOW EITHER DIRECTION
< 5
CHAMFER
COUPLING WITHSEALING RANGE FORLARGER PIPE
GROUT AS PERMRWA-S-516
ONLY SUITABLE FOR BRIDGING WHERE HOST AND MAKEUP PIECE ARE THE SAME PIPE
EPDM RUBBER BUSH OFCORRECT THICKNESSTO COMPENSATE FORDIFFERENCE IN PIPE OD.BUSHES FOR > DN300PIPE ARE CUSTOM MADETO ORDER.
Quality Control:A. Contractors accredited by approved
mechanical insert suppliers shall assesswhich of mechanical insert or patch lineris the most appropriate sealing method.
B. Mechanical inserts shall be used wherepractical. Patch liners may be used when:B.A. a longitudinal crack is present in
the host main (where expansion ofthe mech insert may elongate thecrack),
B.B. an obstruction in the pipe preventsmechanical insert installation.
B.C. the defect is longer than can besealed by a mech insert .
C. MRWA Approved Patch Liners aredefined in Sydney Water documentACP003: List of Deemed to ComplyProducts for Pipeline Rehabilitation.
D. Mechanical inserts and patch liners needto be installed as per the manufacturersinstructions and QA procedures.
E. Pre and post installation Visual Recordsas per Table 500-D shall be provided tothe Water Agency.
Limitations & Requirements:a. Mechanical inserts approved in MRWA Products Portal may only be used
to repair small defects (ie: defects or openings < insert length minus 300).b. Mechanical inserts shall not be used on lined sewers.c. Maximum 4 inserts or patches per sewer. Should more than 4 be required,
obtain Water Agency approval or reline sewer from maintenance structureto maintenance structure.
d. Min 1m separation between mechanical inserts.e. Patch liners are typically about 1 meter long but two may be 200
overlapped to bridge defective pipe up to 1m long.f. For defective pipe longer than 1m, replace section of pipe as per Option 2
or reline the sewer from maintenance structure to maintenance structure.
>300>300
GROUT AS PERMRWA-S-516
Depth refers to the height between FSL and the lowest invert
PVC DWV CONNECTION PIPEWORK SHOWN. SAMEAPPROACH SHALL BE TAKEN FOR VC PIPEWORK
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JUNE 2020JUNE 2020
2020 1
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
DECOMMISSIONING OFSEWERS AND STRUCTURES
MRWA-S-516
Sewer Decommissioning Procedure: (Assumes concrete MHs)Select and apply materials as described in Tables 500-B & C and adjacent notes.A. Remove sewer main from service (disconnect inflows).
Option 1: Seal Downstream Junctions:B. Prepare inflow channel and pipe for concrete / Compo.
B.A. Remove all drop pipe, fittings and brackets. Refer Figure 516-D.B.B. Remove greater than half of pipe within MH wall (cut or jackhammer out).
C. If grouting buried sewer line or leaving in place:C.A. Place sandbags up inflow pipe, more than 100 past structure wall.C.B. If grouting, place breather through sandbags and extend into MH and up to a
higher elevation than the highest grout level (highest obvert of sewer beingdecommissioned) plus 1m.
D. Place Bonding Agent on all surfaces which will contact concrete.E. Fill redundant shaft inflow pipe with Compo.F. Fill base channel with concrete, ensuring new concrete finishes flush with existing
table and live channel surfaces (refer Notes F & G of MRWA-S-500).G. Remove any retaining plate and plug any fastener holes in table with Compo.
Option 2: Remove SewerH. Remove sewer pipe to within 500 of maintenance structure. Alternatively, remove
adjacent sewer if note 1 from Table 516-A applies.
I. Cut sewer cleanly and install close fit cap to pipe.J. Place concrete or cement stabilised embedment all around capped pipe
down to bottom of excavation.Option 3: Grout SewerIf sewer terminates at a MH:K. Open temporary ball valve on breather.L. Where practical, open property service IO caps to allow air escape
and the property connection pipe to be grouted below the grout level.M. Place grout, slowly enough that the grout will rise from the low point without
creating any air pockets.N. Monitor the grout level in the breather and ensure that it does not overflow from
the breather by closing the ball valve if the grout level gets too high.O. Complete grouting of the sewer until the pipe is full. Allow grout to set (ie: >24 hrs).P. Trim off breather pipe flush with the table or wall surface. Reuse ball valve if
functional.If sewer terminates at a pipe connection, MS or MC:Q. Block the end of pipe by (i) grouting the downstream line as above, (ii) installing
mechanical insert or patch liner (refer Fig 514-A & B), or (iii) installing a plug.R. Insert grout placement Tremie hose down pipe sewer to just before end of line.S. Pump grout down Tremie hose in one continuous operation while retracting the
Tremie hose at a speed to match the pump rate. Grout until pipe is full.
FIGURE 516-E: MH BASE JUNCTIONSEAL, PRE GROUT PLACEMENT
NEW CONCRETE
TEMPORARY PLATETO RETAIN CONCRETEIF SEWAGE LEVELABOVE INVERT
BREATHER.DN50 SOLVENTWELDED PVCPRESSURE PIPE
SANDBAGS
TEMPORARY BALL VALVESET BALL VALVEABOVE HIGHESTOBVERT OF PIPE TOBE GROUTED + 1m
FIGURE 516-F: MH BASE JUNCTIONSEAL, POST GROUTED SEWER
TRIM PIPE SO FLUSHWITH TABLE ONCEGROUT HAS CURED
GROUT
TYPICAL SITUATION WHERE OPTION APPROPRIATE
SHALLOW SEWER and UNPAVED SURFACE
ALL DECOMMISSIONED SEWERS
DECOMMISSIONING OPTION
FIG 516- G and H
FIG 516- B to J
TABLE 516-B: SEWER DECOMMISSIONING OPTIONS
2
1
REMOVE SEWER + OPTION 1
SEAL DOWNSTREAM JUNCTION
REFERENCE
RISKS OF LEAVING EMPTY REDUNDANT SEWERS IN PLACE:a. Sewer Collapse. May lead to subsidence of the surface or neighboring structures.b. Damage from Groundwater. Empty decommissioned sewers can provide a conduit whereby ground water could
enter, accelerate and erode or scour the area where it discharges. Steep decommissioned sewers (steeper than 1 in20) and decommissioned sewers with substantial elevation change (>2m) should be grouted or removed.
c. Infiltration and inflow. Ground water may enter decommissioned assets and flow into live sewers unlessdownstream junctions are correctly sealed.
DEEP SEWERS or PAVED SURFACE or EXCAVATION IMPRACTICAL FIG 516- A to F3 GROUT SEWER + OPTION 1"SHALLOW" and "DEEP" terms defined in Table 514-B.
LIKELIHOODOF COLLAPSE
MEDIUM
HIGH
PIPE MATERIAL
ADJACENT INFRASTRUCTURE PRESENT 1 ADJACENT SIGNIFICANT INFRASTRUCTURE PRESENT
ADJACENT INFRASTRUCTURE PRESENT
TABLE 516-A: SITUATIONS WHERE SEWERS REQUIRE GROUTING or REMOVAL
PLASTIC, GRP orDEFECTIVE VC 2
CONCRETE or METALLIC
WHEN GROUTING / REMOVAL REQUIRED
LOW ADJACENT SIGNIFICANT INFRASTRUCTURE PRESENTSOUND VC 2
· "ADJACENT" can be considered to be where the seweris within the zone of influence of the infrastructure.
· "PRESENT" could be now or in the future.· "INFRASTRUCTURE" can be considered to be any
functioning asset (eg: road, footpath, residentialdwellings, shops etc).
· "SIGNIFICANT INFRASTRUCTURE" can be consideredto be any functioning asset of high importance (eg: > 3story buildings, VicRoads roads, rail, tram lines etc).
1 Only required for the part of sewer adjacent to theinfrastructure.
2 Assess condition of DN100 VC pipe where AdjacentSignificant Infrastructure present as per MRWA-S-500.
GROUTING / REMOVALREQ'D (REF) TABLE 516-A
YES
NOT NECESSARY
YES
>100
GROUTED DECOMMISSIONED SEWERAGE MAIN
FINISHED SURFACE LEVEL (FSL)
>1mBACKFILL AS PER MRWABACKFILL SPECIFICATION
FIGURE 516-A: MAINTENANCE STRUCTURE DECOMMISSIONING
IF TRAFFICABLE: AS PER ROAD OWNER'SSPECIFICATION and MIN CLASS 4 FCR.IF NON-TRAFFICABLE: GRANULAR FILL
FIGURE 516-C: MH SHAFT JUNCTIONSEAL, GROUTED SEWER
>100
TRIM PIPE SO FLUSHWITH TABLE ONCEGROUT HAS CURED
GROUT
FIGURE 516-B: MH SHAFT JUNCTIONSEAL, PRE GROUT PLACEMENT
>100
BREATHER. DN50SOLVENT WELDED PVCPRESSURE PIPE
TEMPORARY BALL VALVE
SET BALL VALVEABOVE HIGHESTOBVERT OF PIPE TOBE GROUTED + 1m
COMPO. FINISHFLUSH WITHINTERNAL WALL
FIGURE 516-D: MH SHAFT JUNCTIONSEAL, DROP PIPE CHANNEL FILL
REMOVE DROPPIPE AND FILLCHANNEL WITHNEW CONCRETE
THIS FIGURE APPLIES TO ALL SHAFT JUNCTION SEALS(FIGURES 516- C, G & I)
FIGURE 516-J: MH BASE JUNCTIONSEAL, SEWER LEFT IN PLACE
FINISH CHANNELINFILL CONCRETEFLUSH WITH EX TABLE
NEW CONCRETE
SANDBAGS
SEWER LEFTIN PLACE
FIGURE 516-H: MH BASE JUNCTIONSEAL, REMOVED SEWER
NEW CONCRETE
FIGURE 516-G: MH SHAFTJUNCTION SEAL, REMOVED SEWER
COMPO. FINISHFLUSH WITHINTERNAL WALL
CAP
>100
CAP>100
>100
>100
FIGURE 516-I: MH SHAFT JUNCTIONSEAL, SEWER LEFT IN PLACE
GENERAL NOTES:· All live sewer maintenance (cleaning) and construction work shall be
completed by a Water Agency approved contractor.· Flow control is the responsibility of the contractor. Spills are not acceptable.
SEWER LEFTIN PLACE COMPO. FINISH
FLUSH WITHINTERNAL WALL
SANDBAGS >100
>100
REMOVE ALLDROP PIPE ANDBRACKETS
REMOVE ALLDROP PIPE ANDBRACKETS
SANDBAGS
REMOVE ALL DROPPIPE & BRACKETS
EXISTINGWALL
i) Cut back > 50 of bracketinsert within wall.
ii) Fill cavity with Compo toMH inner wall surface.
DROP PIPEBRACKETWALL INSERT
COMPO
FINISH CHANNELINFILL CONCRETEFLUSH WITH EX TABLE
T
REMOVE >HALF OF PIPEWITHIN WALL
1. Grout redundant sewers, orCover channels with half pipe (one size larger than channel), sealgaps and concrete to 100 above crown of covers.
2. Remove all of structure within 1m of surface and dispose of allmaterials.
3. Backfill the excavation as per the relevant MRWA BackfillSpecification 04-03.
WALL
Maintenance Structure Decommissioning Procedure:
>50
a. Remove and dispose of the vent and base.b. Excavate and remove all buried pipework within 1m of FSL.c. Grout the buried vent pipe if required as per Table 516-A & B.
Vent Decommissioning Procedure:
PIPE SIZE
> DN150ANY
ANY
> DN150TYPICALLY ALL OF REDUNDANT SEWER SHALL BE REMOVED OR GROUTED UNLESS NOTE 1 APPLIES
FILL DROP PIPECHANNEL AS FIG 516-D
FILL DROP PIPECHANNEL AS FIG 516-D
IF SEWER TO REMAIN LIVE, PLACE ANDSECURE COVER(S) OVER CHANNELS
>300
>300
NEW CONCRETE ORCEMENT STABILISED
EMBEDMENT
> T / 2
LIMIT:TOP
RUNG< 600
BELOWFSL &
BELOWNECK
MRWA SEWERAGE STANDARDSMELBOURNE RETAIL WATER AGENCIESDRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H H
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
VERSIONISSUED
DATE:
DATE:
CHECKED:GWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
JAN 2020JAN 2020
2020 1PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
EXISTING CONCRETE MH HEIGHTADJUSTMENT, METHOD
SELECTION & GENERAL REQUIREMENTS
MRWA-S-518
FIGURE 518-J: NECK LOWER FIGURE 518-K: TRUNCATECONICAL TOP
FIGURE 518-M: TRUNCATECONICAL TOP & SHAFT LOWER
FIGURE 518-L: SHAFT LOWERFIGURE 518-F: SHAFT RAISE FIGURE 518-H: NECK RAISE FIGURE 518-I: EXISTINGCONICAL TOP MH
FIGURE 518-G: TRUNCATECONICAL TOP & NECK RAISE
GENERAL NOTES:1. Works shall be undertaken in accordance with the Water Agency's Confined Space procedure by a Live
Sewer accredited Contractor.2. MHs shall be inspected and measured prior to works commencing so that the appropriate height
adjustment method can be selected.3. Depending on Table 313-B, some of the provided options may be interchangeable, for example:
3.1. Figures 518-A and 518-F3.2. Figures 518-E and 518-L.ie: once the existing shaft is exposed, the MH may be rebuilt with either a Flat Top or Conical Top.
4. Where the existing MH has a shaft connection, new construction is not permitted within 500 of the shaftconnection.
5. Where MHs in a significantly deteriorated state are observed, contact the Water Agency for advice.A number of options may be considered:5.1. Rehabilitate the existing MH to be retained with a liner or Calcium Aluminate Cement CAC.5.2. Knock down the MH to the nib wall and reconstruct from that level.5.3. Decommission the MH and reconstruct a new MH over the sewer (refer MRWA-S-508 to 512 & 516).
6. MH depth may exceed 8m depth if structural assessment of the existing MH by a competent personindicates that it is structurally capable of being deepened.
7. These details may also be applied to the removal and reconstruction of cover and step ironor ladderrelocation within MHs
FIGURE 518-D: NECK LOWER FIGURE 518-E: SHAFT LOWERFIGURE 518-B: NECK RAISE FIGURE 518-C: EXISTINGFLAT TOP MH
FIGURE 518-A: SHAFT RAISE
LIMIT: > 100
LIMIT: SHAFTHEIGHT 1000
FLAT TOP MH HEIGHT ADJUSTMENT OPTIONS:
CONICAL TOP MH HEIGHT ADJUSTMENT OPTIONS:
LIMIT: < 8m
CUT LINE FORFIGURE 518-E OPTION
REMOVE FLAT TOP,CUT AND REMOVE
UPPER SECTION OFSHAFT & REPLACE
FLAT TOP
REMOVE FLAT TOP,ADD SHAFT &
REPLACE FLAT TOPCUT LINE FORFIGURE 518-D OPTION
CUT LINE FORFIGURE 518-B OPTION
LOWER NECK, orREMOVE NECK &PLACE NEW NECK,COVER & FRAME
CUT & REMOVEUPPER SECTION OF
NECK, EXTEND NECKWITH NEW COVER &
FRAME
NEW & OLD CONCRETEINTERFACE
NEW & OLD CONCRETEINTERFACE
LIMIT: < 900
HEIGHT: REFTABLE 313-C
HEIGHT OPTIONS
LIMIT: < 8m
NEW &OLD
CONCRETEINTERFACE
REMOVE CONICALTOP, ADD SHAFT &NEW CONICAL TOP
CUT LINE FOR FIGURE518-L & M OPTIONS
CUT LINE FORFIGURE 518-F OPTION
CUT LINE FORFIGURE 518- K
OPTIONS
PRIOR APPROVALREQUIRED AS MH
BECOMES NON-ENTY.
TRUNCATE CONICALTOP, ADD NEW 750ID
NECK
LIMIT: NONECK
CUT LINEFIG 518-J
CUT LINE FIG 518-H
REMOVE COVER &FRAME AND RAISE
NECK
REMOVE SECTIONOF NECK REMOVE NECK AND
SECTION OFCONICAL TOP REMOVE NECK,
CONICAL TOP ANDSECTION OF SHAFT.
REBUILD TO NEWSURFACE LEVEL
REMOVE NECK, CONICALTOP AND SECTION OF
SHAFT. ADD TRUNCATEDCONICAL TOP
FLAT TOP MH Height Adjustment:A. Existing flat tops may only be reused if they are in excellent condition (ie: no discernable loss of material, concrete is
hard such that it does not flake or spall when hit with a hammer, lift anchours in new condition).B. Where the frame is cast into the neck and it is in corroded or in poor condition and the conversion slab (flat top) is in
good condition, the neck may be removed and rebuilt on the existing conversion slab if conversion slab is to be reused.
LIMIT:NOSHAFT
CONVERSION SLAB
NECKSHOWN AS EXISTING.
MAY NEED TO BE NEW(REFER NOTES A & B)
SHOWN AS EXISTING.MAY NEED TO BE NEW(REFER NOTES A & B)
REFER FIGURE 313B-A REFER FIGURE 313B-BREFER FIGURE 313B-B
REFER FIGURE 313B-C
REFER FIGURE 520-D or E
REFER FIGURE 520-F or G
REFER FIGURE 520-F or GREFER FIGURE 520-J REFER FIGURE 520-H & I
LEGEND:New Assert (black)
Existing asset (blue)
LIMIT: TOPRUNG < 600FROM FSL& BELOWNECK
EXISTING MH
EXISTING MH
REFER FIGURE 313B-C REFER FIGURE 313B-C
HEIGHT: REFTABLE 313-C
HEIGHT OPTIONS
MRWA SEWERAGE STANDARDS
VERSIONISSUED
MELBOURNE RETAIL WATER AGENCIESDATE:
DATE:
CHECKED:DRAWN:DESIGNED:
1 2 6 7 8 9 10 12113 4 5
H HGWW
SEW
YVW
DATENAME APPROVED:
GWW
SEW
YVW
DATENAME
APPROVEDDATEDESCRIPTIONREV
A
1 2 63 4 5
B
C
D
A
E
F
G
1 2 6 7 8 9 10 12113 5
A
B
C
D
E
F
G
H
Planning Design Construction
R. JAGGERR. JAGGER
JAN 2020JAN 2020
2020 1
ALL DIMENSIONS IN mm UNLESS STATED OTHERWISE
PRE-PUBLISHED DRAFT1 CP / GA / NGJUN 20
G. ANTHONSENC. PAXMANN. GERHARD
S. TRIKHA
R. LEOND. STEWART
SEP 20SEP 20SEP 20
SEP 20SEP 20SEP 20
PUBLISHED FIRST ISSUE2 CP / GA / RLSEP 20
NOT TO SCALE
EXISTING CONCRETE MHHEIGHT ADJUSTMENT,
CONSTRUCTION DETAILS
MRWA-S-520
F.S.L F.S.LNON ROADPAVEMENTOR SOIL
NEW MAKEUP RING
NEW COVER
<600
FIGURE 520-D: LOWERED CONE TOP MH NECK IN ANY SITUATION
NOTES Regarding All Height Alterations:· Arrangements shown are suitable for both conical and flat
top MHs unless otherwise indicated.· All figures are shown in the finished altered state.· Re-grease all frames prior to replacement of covers.· All frames and covers shall be new and as per Table 313-E.· New cover shall be the same size as that removed unless
otherwise stated.· Place covers over live channels to collect debris and ensure
that no content enters the sewer.
FIGURE 520-E: LOWERED MH NECK OUT OF ROAD PAVEMENT
CONCRETE SURFACEIF PAVEMENT
CONCRETE SURFACE IF SOIL
F.S.L
MASTICWEDGES (x 3)
FIGURE 520-G: RAISED MH NECK OUT OF ROAD PAVEMENTFIGURE 520-F: RAISED MH NECK IN ANY SITUATION
F.S.L
TOP RUNG LEVEL TOP RUNG LEVEL
NEW COVER ASPER TABLE 313-ENEW COVER
<900
FIGURE 520-J: TRUNCATED MH CONE WITHRAISED 750Ø NECK TO SURFACE
F.S.L
FRESHCONCRETE
POSSIBLEOUTLINE OF
ORIGINAL 600ØNECK
CUTTING EXISTING CONCRETE:A. Ensure only MHs in sound condition are cut.B. Jack hammer demolition not allowed.C. Ring or demolition saw cut, or
D. Plug and feather cut.E. Where mastic joint to be used, cut surface
must be flat with surface irregularities <5mm depth.
LADDER / STEP IRON ALTERATION PROCEDURE:Ladder and step irons shall be installed / modified in accordance with MRWA-S-314.1. Cut down ladder or remove step irons as required (to <600 from new FSL).2. If Figure 520-J being constructed: (i) if ladder / step irons in poor condition, remove all (structure becomes
non-entry), or (ii) if ladder / step irons in good condition, apply note 1.3. Install new ladder support brackets as required as per Figure 314-D.4. Extend ladder from existing ladder using brackets as per Figure 314-B.5. Add new step irons as per Figure 314-E when raising MHs.6. If a landing is present, it shall be left in place unless impractical to do so. New landings need not be added.
Pre-cast construction joints not permitted for MH's < 12 months old.MASTIC + PRECAST COMPONENT PROCEDURE:1. Cut neck / cone / shaft (refer cut instructions).2. Place mastic primer on both surfaces.2. Place 25 wide triangular bromo butyl mastic around top surface.3. Locate precast item (frame, flat top, ring segment) with wedges.4. Place precast item centrally.5. Place new rapid set concrete around joint perimeter, > 2T wide and
> 200 deep (flat top on vertical shaft does not require this).6. Place new cover & return to normal service.
CONCRETE SPECIFICATION:a. Concrete quantities > 0.5m3 shall be approved fresh
plant mixed 32 MPa concrete trucked to site.b. Concrete quantities < 0.5m3 may be mixed on site using
50 MPa structural concrete (ie: not "builders" concrete).
IRREGULARLY SHAPED ORBRICK EXISTING MH SHAFT
CONVERSION SLABOUTER EDGE
IRREGULARLYSHAPED ORBRICK EXISTINGMH SHAFT
NEW SHAFT
REINFORCEMENT AS PERTABLE 313B-D & MRWA-S-309
CONVERSION SLAB INTERNALDIAMETER TO SUIT NEW SHAFTINSIDE DIAMETER
SLAB OUTER EDGE. DIMENSIONS:> NEW SHAFT OUTSIDE DIAMETER, &> LOWER SHAFT OUTSIDE EDGE
XY
A
MASTIC
HOOP AND OUTER BARS TO BE N20.ADD OUTER BAR IF SL81 MESH USED.
INNER DIAMETER OFCONVERSION SLAB MAYBE FOR 600 or 750 NECKOR 1050 / 1200 SHAFT
CONVERSION SLAB.REF FIG 313B-D
THIS OPTION REQUIRES WATER AGENCY APPROVAL.
B-
A-
FIGURE 520-K: SECTION A: CONVERSION SLAB
FIGURE 520-L: SHAFT SHAPE OR DIAMETER CHANGE
FIGURE 520-M: SECTION B: COMPONENT OUTLINES
NEW UPPER SHAFTOUTSIDE DIAMETER
<600
NEW SHAFT.ENSURE ID BETWEEN X & Y.ENSURE OD > A.
REF FIG 520-A
FIGURE 520-H: TRUNCATED MH CONE & PRECAST FRAME
F.S.L
FIGURE 520-I: TRUNCATED MH CONE & CAST IN SITU FRAME
F.S.L
NEW COVER AS PER TABLE 313-C(750 ROUND COVER SHOWN)
REFER FIG 520-A or B
NEW COVER AS PER TABLE 313-C(750 ROUND COVER SHOWN)
REF PER FIG520-A or B
· Lip of precast concrete frame surround may need to be trimmed to fit within the recess ofthe make up ring.
· Proprietary MH adjustment rings systems approved by the Water Agency (eg: Cretex)may be used in lieu of the above. Install as per manufacturer's installation instructions.
50 to75
>200
>200
NEW CAST IN SITUCONCRETE
> N12 DOWEL (x4)EQUI-SPACED AROUND
PERIMETER
ADHESIVE CAPSULE
EXTEND INTO NEWCONCRETE AS LONG AS
POSSIBLE UP TO 200
MORTAR
30-50
>50
FIGURE 520-C: PRE-CAST CONSTRUCTION JOINT
FIGURE 520-A: DOWEL CONSTRUCTION JOINT
FLAT CUTSURFACE
REMOVE LIPFROM PRECASTSURROUND IFREQ'D
FRAME &PRECASTSURROUND
FRESHCONCRETE>200
REF PERFIG 520-C
REF PER FIG520-A or B
REF PER FIG 520-C
SHALLOW PLAIN CONCRETE CONSTRUCTION JOINT SHOWNFOR FLAT TOPS, WHERE NECK CUT TO < 100 HIGH, REMOVE ALL OF EXISTING NECK
MHs IN TRAFFICABLE AREAS MAY NOT BE TRUNCATED
REF PER FIG 520-C
CAST IN SITU PROCEDURE:1. Cut neck / cone / shaft (refer
cut instructions).2. Scabble / roughen cut surface,
exposing aggregate.3. Place internal (& external if
preferred) formwork.4. Place mortar over cut surface.5. Pour new concrete to F.S.L
6. Place new frame within wetconcrete & finish surface.
7. Steel plate over work area if intrafficable area.
8. Wait until 60% cure strength(ie: 24 hrs normally).
9. Strip formwork, Compo formsupport holes, place new cover& return to service.
LEGEND:New Assert (black)
Existing asset (blue)
NEW COVER AS PER TABLE 313-C(750 ROUND COVER SHOWN)
750
NON ROADPAVEMENTOR SOIL
NEW COVER
REMOVE LIPFROM PRECASTRING IF REQ'D
100 to 200
FIG 520-B: PLAIN CONCRETE CONSTRUCTION JOINT
2T
30-50
>200 >50
FRESHCONCRETE
CONCRETESURFACE IFPAVEMENT
CONCRETESURFACE IF SOIL
>200
100 to 200
TALLER DOWEL CONSTRUCTION JOINT SHOWN
REF PERFIG 520-A
>200
ROUGH SURFACE
MORTAR
ROUGH SURFACE
FLAT OR CONE TOP
FLAT OR CONE TOPFLAT OR CONE TOP
T
2T T
FLAT OR CONE TOP