Guidelines for Horizontal Directional Drilling Pipe Bursting Microtunnelling and PJ
Short Drive Microtunnelling (MTBM) - CATTcattevents.ca/pdf/TRS_ses1_Woodbridge.pdf · MTBM - Three...
Transcript of Short Drive Microtunnelling (MTBM) - CATTcattevents.ca/pdf/TRS_ses1_Woodbridge.pdf · MTBM - Three...
TRENCHLESS TECHNOLOGY ROADSHOW
May 28-29, 2014 – Scotiabank Convention Centre, Niagara Falls, ON
Short Drive
Microtunnelling (MTBM)
Founded in Streetsville Ontario in 1947
Specialize in Large Diameter:
Microtunnelling
Auger Boring
Pipe Ramming
HDD – Horizontal Directional Drilling
Pipe Bursting
Hand Mining
Right Sized Trenchless Technologies
Engaged Partner in all Aspects of the Trenchless Industry CATT, NASTT, OHDDA, Industry Lectures and Seminars, Trenchless Design Consultation, Project Post Mortem
Earth Boring Co. Limited
Trenchless Since 1947
In microtunelling hydraulic jacks are used to push pipes
through the ground behind a shield at the same time as
excavation is taking place within the shield.
MTBM provides a flexible, structural, watertight, finished
pipeline as the tunnel is excavated.
Microtunnelling – MTBM
Slurry machines belonging to the category of closed, full face
excavation machines with a hydraulic slurry circuit.
The soil to be excavated is removed using a cutterhead adapted to the
respective geology. This makes it possible to use the machines in
almost all geological conditions.
In soft soils and mixed geologies, standard or mixed ground
cutterheads are used, while a rock cutterhead with disc cutters is used
for tunnelling in stable rock formations.
Microtunnelling – MTBM
A cone-shaped crusher inside the excavation chamber crumbles stones
and other obstructions to a conveyable grain size while tunnelling and
advancing.
Afterwards, the material falls through openings similar to a strainer in
front of the suction port and is then removed through the slurry line
together with the slurry suspension
Microtunnelling – MTBM
Complex Ground Conditions –
Mixed Face
Wet Soils, Ravelling Face
Cobbles, Boulders
Rock
Long Drives (IJS)
Range of Pipe Diameter
Microtunnelling – MTBM
Suited For:
Sounds like it’s the panacea! Why aren’t we doing this on all our projects?
Cost & Risk
Microtunnelling – MTBM
So Why Isn’t It the Only Choice?
Cost 2.5x Auger Boring
2-3x HDD
1.5x Pipe Ramming Comparatively the above are generally constrained in one fashion
or another by soils, diameter of product pipe and length
Microtunnelling – MTBM
So Why Isn’t It the Only Choice?
So cost would limit the selection of MTBM over the other methods
Risk Time
Hwy, Railway
Soils, challenging, unknown
Environment, rivers, wetlands, Fisheries Window
Subsidence
Limiting the potential unknown
Limiting Potential Schedule Over-runs
Microtunnelling – MTBM
So Why Isn’t It the Only Choice? Risk begins to bring the palate for cost back in line
Short Run Trenchless Projects May Not SEEM to make
sense
Cost Quantum
In Short, It’s an Expensive Venture
Suited for Longer
Microtunnelling – MTBM
So Why Isn’t It the Only Choice?
Mobilization
Drive
De-Mobilization
MTBM - Three Main Elements to the Drive
Outside of planning and design, project closeout
MTBM - Three Main Elements to the Drive
Hand Mine
HDD Auger Bore
Pipe Ram
MTBM
Set-Up 1 2 2 2 7
Drive 20 5 8 10 3
De-Mob 1 2 2 2 4
Duration 22 9 12 14 14
All things being equal Soils, Diameter, Distance 900mm, 30m, Alluvial
Hand Mine and MTBM in line for costs Most economical would be HDD Auger Bore is another suitable choice Pipe Ram 2.5x the AB Price
MTBM - Three Main Elements to the Drive
Hand Mine
HDD Auger Bore
Pipe Ram
MTBM
Set-Up 1 2 2 2 7
Drive 20 5 8 10 3
De-Mob 1 2 2 2 4
Duration 22 9 12 14 14
Soils, Diameter, Distance 900mm, 50m Under a River Soils are not cohesive & unknown under River 0.1% Grade
Hand Mine and MTBM in line for costs Most economical would be HDD Auger Bore is another suitable choice Pipe Ram 2.5x the AB Price Length – Conservation Authority has asked that the limits be moved outside flood
area HDD still possible, up to 1000m. But not at fine grades Auger Bore – soils limitations, outside end of viable length, need to upsize liner Pipe Ram – same as auger bore, but no grade or line control
MTBM - Three Main Elements to the Drive
Hand Mine
HDD Auger Bore
Pipe Ram
MTBM
Set-Up 1 2 2 2 7
Drive 20 5 8 10 3
De-Mob 1 2 2 2 4
Duration 22 9 12 14 14
Soils, Diameter, Distance 900mm, 50m Under a River Soils are not cohesive & Unknown under River 0.1% Grade
Length – Conservation Authority has asked that the limits be moved outside flood area HDD still possible, up to 1000m. But not at fine grades Auger Bore – soils limitations, outside end of viable length, need to upsize liner Pipe Ram – same as auger bore, but no grade or line control
No system movement for grade adjustment Adjustment to construction sequence places this component on critical path
Conservation Authority Limits of Approach Windows
Encroachment Permit Limits Issue Resolution
MTBM - Risk Drives Utilization of Short
Distance MTBM
But what constitutes a short drive MTBM?
150m or Less Economies of Scale when
Compared to Standard Tunnel & Considering Other Standard
Trenchless Operations
2nd Concession 120m Gravity Sewer 1200mm Holland River Wet Running Sand and Cobbles Concrete Obstruction Existing Structures Other Trades on Site Initially HDD CHANGE SOILS River
OPG Darlington 72m x 1500mm Steel Liner Un-Cohesive Soils Unknown Soils under railway Hi Speed Railway Corridor Designed as Auger Bore Change Soils Risk Railway Unknown Soils
OPG Darlington 72m x 1500mm Steel Liner Un-Cohesive Soils Unknown Soils under railway Hi Speed Railway Corridor Designed as Auger Bore Change Soils Risk Railway Unknown Soils
Region of Peel 2 x 1200mm RCP 30m & 40m Solid Shale Bedrock w Limestone Stringers Environmental Crossings Lakeshore Rd & Dixie Busy Thoroughfare Risk Time Environmental
Region of Peel 2 x 1200mm RCP 30m & 40m Solid Shale Bedrock w Limestone Stringers Environmental Crossings Lakeshore Rd & Dixie Busy Thoroughfare Risk Time Environmental
Region of Peel 2 x 1200mm RCP 30m & 40m Solid Shale Bedrock w Limestone Stringers Environmental Crossings Lakeshore Rd & Dixie Busy Thoroughfare Risk Time Environmental
Region of Peel 1200mm RCP 110m Solid Shale Bedrock Environmental Crossings Erin Mills Parkway Had to hit existing shaft Risk Time Accuracy Environmental
Region of York 1200mm RCP 2 x 130m Alluvial Soils Environmental Crossings Risk Time Accuracy Environmental
Short Drive MTBM - Design Considerations
• ROW – Set-Up, MTBM Retrieval • Vehicle Access – Spoils Management • OH Wires • Soils • Balance Soils, Distance, Diameter w/ cost/quality &
schedule • Demonstrated Experience
Soils Distance Diameter Cost Quality Schedule
MTBM - Conclusion
Myriad of Factors Influence Trenchless Technology Selection Key Factors are
• Soil, Diameter and Distance Driving Factors in our Experience?
• Cost • Risk
There is a growing market for short Drive MTBM It is defined and will continue to be defined by the ability and desire to mitigate risk
Gene Woodbridge
Earth Boring Co. Ltd.
www.earthboring.ca
(905) 277-9632
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