GOVERNMENT OF KERALA PUBLIC WORKS DEPARTMENT … · government of kerala public works department...

GOVERNMENT OF KERALA

PUBLIC WORKS DEPARTMENT KERALA STATE TRANSPORT PROJECT

INVITATION FOR BIDS

MAINTENANCE OF PERUMBILAVU-PATTAMBI-PERINTHALMANNA ROAD

Contract No. KSTP/PMT/MC-01

Volume – II

Technical Specification

August 2015

VOLUME II

Particular Technical Specification CONTENTS (i) Technical Specifications (For Maintenance of Perimpilavu Perinthalmanna

Road Ch: (Km 0+000) to Ch: (Km 39+370))

KERALA STATE TRANSPORT PROJECT Technical Specifications

VOLUME II

SECTION 7

TECHNICAL SPECIFICATIONS

CONTENTS PAGE

1. PREAMBLE (i)

2. GENERAL REQUIREMENTS (i)

Part I : GENERAL SPECIFICATIONS (a)

Part II : SPECIAL SPECIFICATIONS (b)

KERALA STATE TRANSPORT PROJECT Technical Specifications Page No. (i)

TECHNICAL SPECIFICATIONS

SECTION 6 1.0 PREAMBLE 1.1 The primary intention of the riding quality improvement works is to attain the roughness

index of not greater than 3.5. 1.2 The Technical Specifications contained herein shall be read in conjunction with the other

Bidding Documents as specified in this Volume 1.2.1 Site Information

The information given hereunder and provided elsewhere is given in good faith by the Employer but the Contractor shall satisfy himself regarding all aspects of site conditions and no claim will be entertained on the plea that the information supplied by the Employer is erroneous or insufficient.

2. GENERAL REQUIREMENTS

The Technical Specifications in accordance with which the entire work described hereinafter shall be constructed and completed by the Contractor shall comprise of the following

2.1 Part - I- General Technical Specifications The General Technical Specifications shall be the "SPECIFICATIONS FOR ROAD AND BRIDGE WORKS" (FIFTH REVISION, April 2013) issued by the Ministry of Surface Transport (Roads Wing), Government of India and published by the Indian Roads Congress, hereinafter referred to as MORT&H Specifications and IRC: 67-2012.

2.2 Part-II-Supplementary Technical Specifications The Supplementary Technical Specifications shall comprise of various Amendments/ Modifications/ Additions to the "SPECIFICATIONS FOR ROAD AND BRIDGE WORKS" referred to in PART - I above and Additional Specifications for particular item of works not already covered in Part - I

2.2.1 A particular Clause or a part thereof in "SPECIFICATIONS FOR ROAD AND BRIDGE WORKS" (FIFTH REVISION, April 2013), referred in Part-I above, where Amended/ Modified/ Added upon, and incorporated in Part-II, referred to above, such Amendment/ Modification/ Addition supersedes the relevant Clause or part of the Clause.

2.2.2 When an Amended/Modified/Added Clause supersedes a Clause or part thereof in the said Specifications, then any reference to the superseded Clause shall be deemed to refer to the Amended/Modified/Added Clause or part thereof.

2.2.3 In so far as Amended/Modified/Added Clause may come in conflict or be inconsistent with any of the provisions of the MORT&H Specifications under reference, the Amended/Modified/Added Clause and the additional specifications shall always prevail.

2.2.4 In the absence of any definite provisions on any particular issue in the aforesaid Specifications, reference may be made to the latest codes and specifications of IRC and BIS in that order. Where even these are silent, the construction and completion of the works shall conform to sound engineering practice as approved by the Engineer and, in case of any dispute arising out of the interpretation of the above, the decision of the Engineer shall be final and binding on the Contractor.

PART I

GENERAL SPECIFICATIONS

KERALA STATE TRANSPORT PROJECT General Specifications Pge No. (a)

PART I : GENERAL SPECIFICATIONS

The General Specifications shall be the

"Specifications For Road and Bridge Works"

(FIFTH Revision, APRIL 2013)

Issued by the Ministry of Road Transport & Highways

Government of India

And published by the Indian Roads Congress, hereinafter referred to as MORTH Specifications.

KERALA STATE TRANSPORT PROJECT Special Specification

PART II

SPECIAL SPECIFICATIONS

KERALA STATE TRANSPORT PROJECT Special Specification

PART II : SPECIAL SPECIFICATIONS

TABLE OF CONTENTS

Section No. Section Page No.

200 SITE CLEARANCE 200-1

300 EARTHWORK, EROSION CONTROL AND DRAINAGE

300-1

400 SUB-BASES, BASES (NON-BITUMINOUS) AND SHOULDER

400-1 to 3

500 BITUMINOUS BASE AND SURFACE COURSES 500-1 to 4

800 TRAFFIC SIGNS, MARKINGS & OTHER ROAD APPURTENANCES

800-1 to 12

900 QUALITY CONTROL FOR ROADWORKS 900-1 to 14

1300 BRICK MASONRY 1300-1

1400 STONE MASONRY 1400-1

1500 FORMWORK 1500-1

1600 STEEL REINFORCEMENT (UNTENSIONED) 1600-1

1700 STRUCTURAL CONCRETE 1700-1 to 2

1900 STRUCTURAL STEEL 1900-1

2100 OPEN FOUNDATIONS 2100 - 1

2300 CONCRETE SUPERSTRUCTURE 2300-1

2500 RIVER TRAINING AND PROTECTION WORK 2500-1

2700 WEARING COAT AND APPURTENANCES 2700-1

3000 MAINTENANCE 3000 – 1 to 4

Page No. (b)


200 SITE CLEARANCE

KERALA STATE TRANSPORT PROJECT Part II: Special Specifications Page No. 200-1

Clause 201 CLEARING AND GRUBBING

Clause 201.5 Measurements for Payment

Delete the first sentence and substitute Clearing and grubbing for road embankment, drains and cross drainage structures shall not be measured separately and shall be deemed to be a part of earth works.

Add the following at the end of this Clause.

Pay Item No. Name Unit of Measurement

201-01 Clearing and grubbing road land including uprooting rank vegetation, grass, bushes, shrubs, saplings and trees girth up to 300 mm, removal of stumps of trees cut earlier and disposal of unserviceable materials and stacking of serviceable material to be used or auctioned, with all leads etc. complete.

Sq m

`

Clause 202 DISMANTLING CULVERTS, BRIDGES AND OTHER STRUCTURES /PAVEMENTS

Clause 202.5 Disposal of Material Add the following at the end of the first paragraph Any salvage material, which can be used in the project, shall be used by the Contractor. The unit rate of the salvage material will be agreed between the Engineer and the Contractor.


Add the following at the end of this Clause. Pay Item No. Name Unit of

Measurement 202-01 Dismantling of existing structures like culverts, bridges,

retaining walls and other structure comprising of masonry, cement concrete, wood work, steel work, including T&P and scaffolding wherever necessary, disposal of material all lifts and leads etc. complete.

(a) Cement concrete grade M-15, M-20 CD No.11/5 Cubic metre

(b) Rubble stone masonry in cement mortar. Cubic metre


300 EARTHWORK, EROSION CONTROL AND DRAINAGE

KERALA STATE TRANSPORT PROJECT Part II : Special Specifications Page No. 300 - 1

Clause 301 EXCAVATION FOR ROADWAY AND DRAINS


Add following item. "Pay Item No. Name Unit of

Measurement

301-01 Excavation for roadwork in soil with suitable machinery including cutting and loading in tippers, in accordance with requirements of lines, grades and cross sections, and transporting to disposal location within all lifts and lead etc. complete.

Cubic metre

Clause 304 EXCAVATION FOR STRUCTURES

Clause 304.4 Measurement for Payment

Add the following at the end of this Clause:

"Pay Item No. Name Unit of Measurement

304-01 Earth work in excavation of foundation of structures as per drawing and tachnical specification , including setting out construction of shoring and bracing removal of stumps and other deleterious matter dressing of sides and bottom and backfilling with excavated material.

Cubic metre

Clause 305 EMBANKMENT CONSTRUCTION


Add the following paragraph to the end of Clause 305.8


305-01 Construction of Earthern shoulders with approved materials from borrow pits inclusive all leads and lifts, etc. complete as per technical specifications and drawings.

Cubic metre

SPECIAL SPECIFICATIONS 400 SUB-BASES, BASES (NON-BITUMINOUS) AND SHOULDER

KERALA STATE TRANSPORT PROJECT Special Specifications Page No. 400 - 1

Clause 401 GRANULAR SUB-BASE

Clause 401.1 Scope


"Site trials shall be performed in accordance with Clause 901.16.

Clause 401.3.2 Spreading and compacting

Add the following at the end of para 1 of this Clause:

"The thickness of the loose layer shall be so regulated that the maximum thickness of the layer after compaction does not exceed 225 mm."

The fifth para of this Clause shall read as under:

"Immediately thereafter, rolling shall start with the help of a vibratory roller of minimum 80 to 100 kN static weight with plain drum or pad foot-drum or heavy pneumatic tyred roller of minimum 200 to 300 kN weight having a minimum tyre pressure of 0.7 MN/m2 or equivalent capacity roller capable of achieving the required compaction. Rolling shall commence at the lower edge and proceed towards the upper edge longitudinally for portions having unidirectional cross fall and superelevation and shall commence at the edges and proceed towards the centre of portions having crossfall on both sides."


In the last para, replace the first sentence with:

“Rolling shall be continued until the density achieved over the full width and thickness of material laid satisfies the requirements of Clause 903.2.2

Add at the end of this clause “ Granular sub base under footpath shall be compacted not less than 95% of maximum dry density by an appropriate method suggested by the Engineer”




401-01 GSB- Construction of granular sub-base by providing close graded material, spreading in uniform layers with suitable machinery on prepared surface, mixing by mix in place etc. complete as per technical specification.

Cubic metre

Clause 406. WET MIX MACADAM SUB-BASE/BASE

Clause 406.1. Scope


“Wet Mix Macadam shall be used as base course

A site trial shall be performed in accordance with Clause 901.16 and only if satisfactory compaction can be obtained to the full depth of the layer may the compacted depth of a single layer exceed 150 mm with prior approval of the Engineer.”

Clause 406.2.1.1. Physical Requirements

Delete the second sentence “If crushed gravel/shingle is used, not less than ……” and substitute:

“The constituents of the aggregates shall be produced by a multiple stage crushing/screening plant and unless otherwise instructed by the Engineer crushing shall be carried out in at least two stages.

If natural gravels are used to produce coarse aggregate, they shall be processed by a crushing plant, so that boulders for crushing are unweathered and have a minimum dimension as measured by callipers of not less than 150 mm. Not less than 98% by weight of crushed particles retained on the 4.75 mm sieve shall have at least two fractured faces.”

Modify Table 400-12 as under


Los Angeles Abrasion Value shall not exceed 35 per cent.

Delete the requirement for Aggregate Impact value in Table 400-12. The specified requirement shall be the Los Angeles Abrasion value only.


"The material shall be derived from boulders or parent rock that is hard, sound, durable and unweathered. It shall contain no deleterious constituents such as organic matter, clay and decomposed rock."

Clause 406.3.3 Preparation of mix

Delete the third sentence in para 2 of this Clause and substitute therefore the following:

“Unless otherwise instructed by the Engineer, the moisture content of the wet mix at the time of compaction shall be between 85% and 115% of the optimum moisture content and no segregation should be permitted”

Clause 406.3.5 Compaction

Delete second and third sentences of para 1 of this Clause.

In para 7, replace the first sentence with :

“Rolling shall be continued till the density achieved over the full thickness of material laid satisfies the requirements of Clause 903.2.2

Clause 406.3.6 Setting and Drying


“The completed Wet Mix Macadam should be primed, in accordance with Clause 502, immediately after the surface is dry.”




406-01 Providing, laying, spreading and compacting graded stone aggregate to wet mix macadam specification including premixing the Material with water at OMC mixing by mix in place etc. complete as per technical specification.the desired density.

Cubic metre


500 BITUMINOUS BASE AND SURFACE COURSES


Clause 501. 8 PREPARATION OF SURFACE Clause 501. 8.1 Scope Add “The work shall also include localised reconstruction involving

excavation of the existing pavement, recompaction of the subgrade and restoring to the required profile with sub-base material.”

Clause 501.8.3 Construction Operations Clause 501.8.3.2 Replace and rename the clause as under: "Preparation of existing road surface"

Add the following at the end of this Clause: “Where granular pavement material is to be placed over an existing

road surface, the bituminous part of the surface of the existing road shall be scarified to the full depth of the bituminous layer leaving the underlying granular material undisturbed as directed by the Engineer. The scarified material shall be removed by scraping into piles which shall be loaded on to trucks and hauled to spoil. If the underlying material is composed of placed bricks, these shall be removed without breaking or spalding them and placed in neat stacks within the right-of-way in accordance with Clause 202.5. The remaining surface shall be blade graded, watered, scarified as necessary, given at least five passes of a vibrating smooth wheeled roller of minimum static weight 8-10 tonnes and compacted to a minimum depth of 200 mm, in accordance with Clause 305.3.5 and 305.3.6, to not less than 98% of maximum dry density, determined in accordance with IS: 2720 (Part 8) as specified by the Drawings or directed by the Engineer

Clause 501.8.3.3 Patching of potholes and sealing of cracks. Amend the Clause as follows: “The areas to be patched shall be agreed with the Engineer. They shall

be cut/trimmed either with saw or hand tools like chisels, pick-axes etc., such that the areas are in the shape of rectangles. The edges shall be cut vertically up to the level where the lower layer is stable without any loose material. The areas shall be thoroughly cleaned with compressed air or any appropriate method approved by the Engineer to remove all dust and loose particles. The excavations shall then be filled with material as per Clause No. 501.2.2.”

For localised reconstruction the existing pavement shall be cut to a regular shape with vertical sides and stepped at successive layers down to the level of the subgrade. The subgrade shall be recompacted according to Table 300-2 and sub-base material shall be laid according to Clause 401.


Clause 502. PRIME COAT OVER GRANULAR BASE Clause 502.7. Measurements for Payment Add the following at the end of the Clause.


502-01

Providing and applying primer coat with bitumen emulsion on prepared surface of granular Base including clearing of road surface and spraying primer at the rate of 0.60 kg/sqm using suitable means.

Sq m

Clause 503. TACK COAT Clause 503.7. Measurements for Payment Add the following at the end of the Clause.

"Pay Item No. Name Unit of

Measurement

503-01 Tack Coat for Bituminous surface below DBM- Sq m

503-02

Providing and applying tack coat with bitumen emulsion using suitable means at the rate of 0.20 kg per sqm on the prepared bituminous/granular surface cleaned with suitable means etc. complete as per technical specification. Tack Coat for Bituminous surface- Providing and applying tack coat with bitumen emulsion using suitable means at the rate of 0.20 kg per sqm on the prepared bituminous surface cleaned with suitable means etc. complete as per technical specification.

Sq m

Clause 505 DENSE BITUMINOUS MACADAM Clause 505.2.1 Clause 505.2.2

Add at the end of the clause “ The grade of the bitumen shall be VG-30 or as directed by the engineer Coarse Aggregates

Delete the words "crushed gravel/shingle or other hard materials" from the first sentence of this Clause.

Delete para 2 of this Clause.


Add the following at the end of this Clause: "The material shall be derived from a parent rock that is hard, sound,

durable and unweathered. It shall contain no deleterious constituents such as organic matter, clay and decomposed rock. "

Crushing and screening shall consist of passing the material through a multiple stage crusher and screening the material, so that after crushing, screening and matching the material conforms to the grading for the layer concerned.

The requirement in Table 500.8 for the maximum values of Los Angeles Abrasion and Aggregate Impact Value shall be 30 percent and 25 percent respectively. The other requirements of the Table shall remain as stated.


505-01 Providing and laying dense graded bituminous

macadam with 60-90 TPH batch type HMP producing an average output of 75 tonnes per hour using crushed aggregates of specified grading, premixed with bituminous binder VG-30 as per mix design transporting the hot mix to work site, laying with a hydrostatic paver finisher with sensor control to the required grade, level and alignment, rolling with smooth wheeled, vibratory and tandem rollers to achieve the desired compaction as per MoRTH specification clause No. 507 complete in all respects.

Cu m

Clause 507 BITUMINOUS CONCRETE

Clause 507.2.1 Clause 507.2.2

Add at the end of the clause “ The grade of the bitumen shall be VG-30 or as directed by the engineer Coarse aggregates

Add to the end of this Clause: “and the maximum values of the Los Angeles Abrasion and Aggregate

Impact Value shall be 30 percent and 25 percent respectively.”

Clause 507.2.5. Aggregate grading and binder content Table 500-17 grading 2 shall remain except bitumen content as per mix

design "Pay Item No. Name Unit of

Measurement


507-01 Bituminous Concrete- Providing and laying dense graded bituminous macadam procured from local avaiable mix obtained from batch plant, premixed with bituminous binder VG-30 as per mix design , transporting the hot mix to work site, laying , rolling to desired compaction etc complete as per MoRTH specification

Cu m

Clause 516. MASTIC ASPHALT

Clause 516.8. Measurements for Payment

Add the following at the end of the Clause.


516-01 Providing and laying 65 mm thick mastic asphalt wearing course on top of deck slab with paving grade bitumen meeting the requirements given in table 500-29, prepared by using mastic cooker and laid to required level and slope after cleaning the surface, including providing antiskid surface with bitumen precoated fine grained hard stone chipping of 9.5 mm nominal size at the rate of 0.005cum per 10 sq m and at an approximate spacing of 10 cm center to center in both directions, pressed into surface when the temperature of surfaces not less than 100 deg. C, protruding 1 mm to 4 mm over mastic surface, all complete as per clause 515. ( MORTH 14-5-515-2702)

Sq m

800 TRAFFIC SIGNS, MARKINGS, AND OTHER APPURTENANCES


Clause 801.

TRAFFIC SIGNS The technical specification will be read as follows 1.1 General Specifications The colour, configuration, size and location of all traffic signs for highways and for other roads shall be in accordance with the Code of Practice for Road Signs, IRC: 67:2012 or as shown on the drawings. In the absence of any details or for any missing details, the signs shall be provided in accordance with international standards and/or as directed by the Owner. The work, in general, shall be executed conforming to IRC 67:2012, as per the description of the item and as per MoRTH’s specifications for Roads & Bridges, 2013 (Fifth Revision). 1.2. Specification of materials for Signs Detailed specification is attached. Materials and fabrication of road signs shall conform to the following requirements: Concrete: Concrete shall be of M25 grade. Reinforcing steel: Reinforcing steel shall conform to the requirements of IS 1786 unless otherwise specified in contract drawings. Bolts, nuts and washers: High strength bolts shall conform to IS 1367 whereas precision bolts, nuts etc, shall conform to IS 1364. Plates and supports: Plates and support sections for the signposts shall conform to IS 226 and IS 2062 or any other stated IS specification. Substrate: Aluminium sheets used for sign boards shall be of smooth, hard and corrosion resistant aluminium alloy conforming to IS 736-Material Designation 24345 or 1900. Plate Thickness: Shoulder mounted signs with a maximum side dimension not exceeding 600 mm shall not be less than 1.5 mm thick with aluminium. All other signs shall be atleast 2 mm thick with aluminium. The thickness of the sheet shall be related to the size of the sign and its support and shall be such that it does not bend or deform under prevailing wind and other loads. Retro reflective sheeting: The retro reflective sheeting used on the signs shall consist of the white or colored sheeting having a smooth outer surface, which has the property of retro reflection over its entire surface. It shall be weather-resistant and show color fastness. It shall be new and unused and shall show no evidence of cracking, scaling, pitting, blistering, edge lifting or curling and shall have negligible shrinkage or expansion. A certificate of having the sheeting tested for co-efficient of retro-reflection, day/night time colour luminous, shrinkage, flexibility, liner removal, adhesion, impact resistance, specular gloss and fungus resistance, 3 years outdoor weathering (as per table 14 of ASTM D 4956-09) and its having passed these tests shall be obtained from an International/ Laboratory, by the manufacturer of the sheeting and in case the certificate is obtained from international agency, it should also be obtained from Indian Agency within 3 years of launching of product by the manufacture in abroad. Retro-reflective sheeting is typically manufactured as a cube corner. The reflective sheeting shall be Class C retro-reflective sheeting made of Grade XI micro prismatic retro-reflective material. The retro-reflective surface, after cleaning with soap and water and in dry condition shall have the minimum co-efficient of retro-reflection (determined in accordance with ASTMD 4956-09) as indicated in the Table 9.2.When totally wet, the sheeting shall show not less than 90 per cent of the values, of retro reflection indicated in the Table 9.2. At the end of 10 years, the sheeting shall retain at least 75 per cent of its original retro-reflectance.


Table 9.2: Acceptable Minimum Coefficient of Retro-reflection for Type XI Prismatic Grade Sheeting** (Candelas per Lux per Square Metre) Observation Angle

Entrance Angle

White

Yellow

Orange

Green

Red

Blue

Brown

Florescent Yellow-Green

Florescent Yellow

Florescent Orange

0.1ºB -4º 830 620 290 83 125

37 25 660 500 250

0.1ºB +30º 325 245 115 33 50 15 10 260 200 100

0.2º -4º 580 435 200 58 87 26 17 460 350 175

0.2º +30º 220 165 77 22 33 10 7 180 130 66

0.5º -4º 420 315 150 42 63 19 13 340 250 125

0.5º +30º 150 110 53 15 23 7 5 120 90 45

1.0º -4º 120 90 42 12 18 5 4 96 72 36

1.0º +30º 45 34 16 5 7 2 1 36 27 14

** Minimum Co-efficient of Retro-reflection (RA) (cd.Ix-1.m-2). 1.3 Adhesives: The sheeting shall have a pressure-sensitive adhesive of the aggressive-tack type requiring no heat, solvent or other preparation for adhesion to a smooth clean surface, in a manner recommended by the sheeting manufacturer. The adhesive shall be protected by an easily removable liner (removable by peeling without soaking in water or other solvent) and shall be suitable for the type of material of the base plate used for the sign. The adhesive shall form a durable bond to smooth, corrosion and weather resistant surface of the base plate such that it shall not be possible to remove the sheeting from the sign base in one piece by use of sharp instrument. The sheeting shall be applied in accordance with the manufacturer’s specifications. 1.4 Fabrication: Surface to be reflectorised shall be effectively prepared to receive the retroreflective sheeting. The aluminium sheeting shall be de-greased either by acid or hot alkaline etching and all scale/dust removed to obtain a smooth plain surface before the application of retro-reflective sheeting. If the surface is rough, approved surface primer may be used. After cleaning, metal shall not be handled, except by suitable device or clean canvas gloves, between all cleaning and preparation operation and application of reflective sheeting/primer. There shall be no opportunity for metal to come in contact with grease, oil or other contaminants prior to the application or retro-reflective sheeting. Complete sheets of the material shall be used on the signs except where it is unavoidable. At splices, sheeting with pressure-sensitive adhesives shall be overlapped no less than 5mm. Where screen printing with transparent colored is proposed, only butt joint shall be used. The material shall cover the sign surface evenly and shall be free from twists, cracks and folds. Cut-outs to produce legends and borders shall be bonded with the sheeting in the manner specified by the manufacturer. 1.5 Messages/ borders: The messages (legends, letters, numerals, etc.) and borders shall either be screen-printed or of cut out from durable transparent overlay or cut-out from the


same type of reflective sheeting for the cautionary and mandatory sign boards. Screen printing shall be processed and finished with materials and in a manner specified by the sheeting manufacturer. For the informatory and other sign boards, the messages (legends, letters, numerals etc.) and borders shall be cut-out from durable transparent overlay film or cut-out from the same reflective sheeting only. Cut-outs shall be from durable transparent overlay materials as specified by the sheeting manufacturer and shall be bonded with the sheeting in the manner specified by the manufacturer. Whenever transparent overlay film is used for making any type of sign, the colored portion of sign shall have coefficient of reflectivity not less than the reflectivity of type and colour of sheeting normally used, as given in Table 9.2. Cut-out messages and borders, wherever used, shall be either made out of retro-reflective sheeting or made out of durable transparent overlay except those in black which shall be of non-reflective sheeting or opaque in case of durable transparent overlay. Creating colored areas by means of screen-printing with ink shall not be permitted. 1.6 Warranty and durability: The Contractor shall obtain from the manufacturer of retro reflective sheeting, a 10 year warranty certificate in original for field performance including the screen printed areas and cut-out sheeting and cut-out durable transparent overlay film and submit the same to the Owner. The contract shall indicate the minimum retro-reflectivity of the signs at the end of the warranty period. 1.7. Specifications for posts and mountings for Signs :The traffic signs shall be mounted on support posts, which may be of GI pipes of Class B conforming to IS 1239. In case of signs supported on two or more posts if necessary bracing may also provided. Sign posts, their foundations and sign mountings shall be so constructed as to hold these in a proper and permanent position against the normal storm wind loads or displacement by vandalism. Normally, signs with an area up to 0.9 square meter shall be mounted on a single post, and for greater area, two or more supports shall be provided. Sign supports may be of mild steel, reinforced concrete (M25) or galvanized iron (GI Post) sections. End(s) shall be firmly fixed to the ground by means of properly designed foundation. The work of foundation shall conform to relevant specifications as specified. For GI posts other than the reflective portion shall be thoroughly descaled, cleaned, primed and painted with two coats of epoxy paint. Any part of Mild Steel (MS) post below ground shall be painted with three coats of red lead paint. The signs shall be fixed to the posts by welding in case of steel posts and by bolts and washers of suitable size in the case of reinforced concrete of GI posts. After the nuts have been tightened, the tails of the bolts shall be furred over with a hammer to prevent removal. For overhead signs, the support systems should be properly designed based on sound engineering principles, to safety sustain the dead load, live load and wind load on the complete system. For this purpose overhead signs shall be designed to withstand a wind loading of 150 Kg/Sqm normal to the face of the sign and 30 Kg/sqm transverse to the face of the sign. In addition to the dead load of the structure, walkway loading of 250 Kg concentrated live load shall also be considered for the design of the overhead sign structure. 1.8. Specification for colour for signs: Signs shall be provided with retro-reflective sheeting and/or overlay film as shown on the detailed drawings. The colour of the material shall be located within the area defined by the chromaticity coordinates in Table 8.1 of IRC 67:2012 and comply with luminance factor given in Table


8.2 of IRC 67:2012 when measured as per ASTM D:4956-09. Chromaticity is the objective specification of the quality of a colour regardless of its luminance, that is, determined by its hue and colorfulness (or saturation/chroma, or intensity) .The colour shall be durable and uniform in acceptable hue viewed in day light or under normal headlights at night. 1.9.. Specification of size of letters :Letter size should be chosen with due regard to the speed, classification and location of the road, so that the sign is of adequate size of legibility but without being too large or obtrusive. Size of letters shall conform to the requirements of IRC 67:2012 unless otherwise specified in contract drawings. The size of the letter, in terms of x-height, to be chosen as per the design speed is given in Table 11.1 of IRC 67:2012.

Pre‐qualification Warranty certificates and test reports specified for each item to be submitted with the tender document/for source approval.

1. The bidder shall obtain and submit a Pre-qualification Warranty Certificate in original for 10 years from the sheeting manufacturer and Sign manufacturer for the retro reflective signs using Type XI sheeting as required in clause No. 801.3.11 of MoRTH specifications and as per clause 6.9 of IRC 67 – 2012, to the tendering authority, in original along with the technical bid.

2. A certified copy of test reports from an independent test laboratory conforming to clause 6.7 of IRC 67-2012 and ASTM D 4956-09 specification, having the sheeting tested for coefficient of retro reflection, daytime colour and luminance, shrinkage, flexibility, liner removal, adhesion, impact resistance, specular gloss and fungus resistance, 3 years outdoor weathering (as per table 14 of ASTM D 4956-09) shall be submitted by the bidder along with the technical bid. The report shall be attested by the retro reflective sheeting manufacturer, the performance reading after three years, must be at least 80% of the minimum values mentioned in table 10 of ASTM D 4956-09 and outdoor weathering test criteria as per Clause 6.4 and Table 14 of ASTM D 4956-09 for Type-XI sheeting performance and as per IRC clause 6.7 of outdoor weathering.

3. An undertaking from the bidder that if selected as the contractor, the supply and installation of all products including the retro reflective sign boards will be strictly conforming to the tender specifications and shall obtain and submit Warranty Certificate of the retro reflective signs as required in clause No. 801.3.11 of MoRTH specifications and as per clause 6.9 of IRC 67 – 2012, to the Engineer, immediately after the completion of work.

4. Also a product certificate in original for each product from the sheeting manufacturers specifying that the products manufactured and supplied to the bidder shall strictly confirm to the tender specifications.

5. One 30 x 15 cm size sample of Sign board (informatory) confirming to the BOQ specification shall be submitted for source approval.

6. After the installation of Sign boards KSTP will conduct a field test to measure the Coefficient of retro reflection randomly. Satisfactory completion of this test will be


considered as the 100% completion of Sign board work

2-Road Stud/RPM Material- Plastic body of RPM shall be moulded from Body ASA/HIPS/ABS. Markers shall support a load of 13635 Kg tested in accordance with ASTM D 4280. Reflective panels shall consist of number of lenses containing Single or dual prismatic cubes capable of providing total internal reflection of light entering the lens face. Lenses shall be moulded of methyl methacrylate confirming to ASTM D 788 or equivalent. RPM to be with molded shank. The strength of detachment of the integrated cylindrical shanks, (of diameter not less than 19 +/- 2 mm and height not less than 30+/- 2 mm) from the body is to be a minimum value of 500 Kgf. The height, width and length shall not exceed 50 mm, 100 mm and 100 mm and with minimum reflective area of 13 Sqcm on each side and the slope to the base shall be 35+/-5degree . Optical performance- Each reflector or a combination of reflectors on each side of the stud have a coefficient of luminance intensity (CIL) not less than that given in table 800-13 of MoRTH specification as mentioned below

Minimum CIL value of Category A stud

Entrance angle Observation angle

CIL in mcd/lx White

Amber

Red

0 deg U 5 deg L&R 0.3 deg 220 110 44 1 deg U10 deg L&R 0.5 deg 120 60 24

Fixing will be by drilling holes on the road for the shanks to go inside, without nails and using epoxy resin based adhesive as per manufacturer’s recommendation and complete as directed by the engineer. Warranty-For 2 years for the satisfactory field performance as per clause 804.7.3 of MoRTH specification

Pre‐qualification Warranty certificates and test reports specified for each item to be submitted with the tender document/for source approval.

1. A certified copy of test reports of having tested the lens and structural strength as per ASTM D 4280 for the specified tests and for the the C.I.L values as per the table 800-13 & 800-14 of clause 804 of MoRTH specification and its having passed these tests shall be obtained and the same shall be submitted along with the technical bid.

2. The bidder shall obtain and submit a Pre-qualification warranty from the product manufacturer in original for 2 years for the field performance of the Road Stud to be


submitted in original along with the technical bid

Metal Beam Crash Barrier: W beams manufactured as per AASHTOM180 will be having thickness 3mm and strip width 480mm. Posts and spacer in C section 150x75 having 5mm thickness. Galvanizing coating by hot dip method will be 78 microns. Test certificates for the qualities mentioned above will be submitted before installing the metal beam crash barrier at site Supplying and fixing Reflectors Supplying and fixing Reflectors of size 8 cm X 12 cm made of Type XI micro prismatic sheeting conforming to ASTM D 4956-09 road side hazards and for bridges as per specifications and as directed by the Engineer

Measurement of payments will read as follows

"Pay Item No.

Name Unit of Measurement

800-01

Direction and Place Identification Signs upto 0.9 sq m Size Board- Providing and erecting direction and place identification retro-reflectorised sign as per IRC:67 -2012 made of micro prismatic grade Type-XI sheeting vide clause 801.3.4.3, fixed over aluminium sheeting, 2 mm thick with area not exceeding 0.9 sqm supported on a mild steel single angle iron post 75 x 75 x 6 mm firmly fixed to the ground by means of properly designed foundation with M15 grade cement concrete 45 x 45 x 60 cm, 60 cm below ground level as per approved drawing .

Each

800-02 Direction and Place Identification Signs with size more than 0.9 Sqm size Board- Providing and erecting direction and place identification retro- reflectorised sign as per IRC :67 -2012 made of

Each


micro prismatic grade Type-XI sheeting vide clause 801.3.4.3, fixed over aluminium sheeting, 2 mm thick with area exceeding 0.9 sqm supported on a mild steel angle iron post 75 mm x 75 mm x 6 mm, 2 Nos. firmly fixed to the ground by means of properly designed foundation with M 15 grade cement concrete45 cm x 45 cm x 60 cm, 60 cm below ground level as per approved drawing

800-03

Providing and fixing reflective road studs ( Raised pavement markers) of ‘category A’ made out of poly carbonate/ABS moulded body and shanks and reflective panels with micro prismatic lens capable of providing total internal reflection of the light entering the lens face with retro reflectance and chromaticity values conforming to ASTM D4280 also confirming to MORTH circular No RW / NH. 33023/10/ 97-DO.III dt 11.06.97 and shall support a load of more than 13 t tested in accordance with ASTM D4280. Lenses shall be moulded of Polycarbonate or methyl methecrylate conforming to ASTM D788 and shall have a CIL not less than values specified in table 1 of said MoRT&H circular including installing by drilling the surface and fixing with adhessive .

Each

800-04

Providing and erecting Warning/Cautionary 900 mm equilateral triangle retro- reflectorised sign with10 years warranty, manufactured as per IRC :67:2012 using Type XI ASTM D 4956-09 micro prismatic retro reflective sheeting fixed over aluminium sheeting, 2 mm thick vide clause 801.3,supported on a mild steel angle iron post 75 mm x 75 mm x 6 mm, firmly fixed to the ground by means of properly designed foundation with M 25 grade cement concrete 45 cm x 45 cm x 60 cm, 60 cm below ground level including paiting all non-reflective faces with epoxy paint 2 coats over epoxy primer.

Each

800-05

Providing and erecting mandatory/ regulatory 600 mm circular retro- reflectorised sign with10 years warranty, manufactured as per IRC :67:2012 using Type XI ASTM D 4956-09 micro prismatic retro reflective sheeting fixed over aluminium sheeting, 2 mm thick vide clause 801.3,supported on a mild steel angle iron post 75 mm x 75 mm x 6 mm, firmly fixed to the ground by means of properly designed foundation with M 25 grade cement concrete 45 cm x 45 cm x 60 cm, 60 cm below

Each


800-06

800-07

800-08

800-09

ground level including paiting all non-reflective faces with epoxy paint 2 coats over epoxy primer. Providing and erecting Informatory / single chevron 600x800 mm rectangular retro- reflectorised sign with10 years warranty, manufactured as per IRC :67:2012 using Type XI ASTM D 4956-09 micro prismatic retro reflective sheeting fixed over aluminium sheeting, 2 mm thick vide clause 801.3,supported on a mild steel angle iron post 75 mm x 75 mm x 6 mm, firmly fixed to the ground by means of properly designed foundation with M 25 grade cement concrete 45 cm x 45 cm x 60 cm, 60 cm below ground level including paiting all non-reflective faces with epoxy paint 2 coats over epoxy primer. Providing and erecting retro-reflectorised Object Hazard Marker sign with 7 years warranty, manufactured as per IRC 67:2012 USING Type XI ASTM D 4956-09 micro prismatic retro reflective sheeting fixed over aluminium sheetig, 2 mm thick / aluminium composit material sheeting 4 mm thick with suitable back support frame and supported on a mild steel angle iron post 75mmx75mmx6mm, firmly fixed 30cm above ground level by means of properly designed foundation with M 15 grade cement concrete 30cmx30x45cm, 45cm below ground level including painting all non-reflective faces with epoxy paint 2 coats over epoxy primer as per approved drawing and clause 801. Supplying and fixing Reflectors of size 8 cm X 12 cm made of Type XI micro prismatic sheeting conforming to ASTM D 4956-09 road side hazards and for bridges as per specifications and as directed by the Engineer. Providing and erecting a "W" metal beam crash barrier as per IRC 73 2015 comprising of 3 mm thick corrugated sheet metal beam rail, 70 cm above road/ground level, fixed on ISMC series channel vertical post, 150 x 75 x 5 mm spaced 2 m centre to centre, 1.8 m high, 1.1 m below ground/road level, all steel parts and fitments to be galvanised by hot dip process, all fittings to conform to IS:1367 and IS:1364, metal beam rail to be fixed on the vertical post with a spacer of channel section 150 x 75 x 5 mm, 330 mm long complete as per clause 810 ( size of foundation 0.40 m x 0.40 m x 1.1 m

Each

Each

No

M


foundation concrete M 15grade ,anchoring end to the ground with M15 concrete including all cost & conveyance of materials ,all labour & fixing charges charges etc. complete as per Drawing and Technical Specifications


Clause 803.

ROAD MARKINGS

Clause 803.2

Materials

This Clause shall read as under:

Clause 803.3.2

"Road markings shall be of hot applied thermoplastic compound and the material shall meet the requirements as specified below".

Add following clause after 803.3.2

Painting on old/new concrete surface shall be with two coats of approved brand Enamel paint and one coat of approved brand primer. Before applying primer concrete surface should be properly cleaned and any old paint material shall be removed completely.

Clause 803.4.2.1


"General: The thermoplastic material shall be homogeneously composed of aggregate, pigment, resins and glass reflectorizing beads. The thermoplastic material shall be factory mixed, from an approved manufacturer, and shall be of a tropical grade suitable for application, by the means proposed, to the specified road surfaces."

Clause 803.4.6

The second sentence of item(e) shall be read “ Cold ductility of the material shall be such as to permit normal movement with the road surface without chopping, cracking or peeling”

Clause 803.6.1


"The material shall be applied only on a surface which is clean and dry. It shall not be laid over loose detritus, mud or similar extraneous matter, or over an old paint marking, or over an old thermoplastic marking which is faulty. New surfaces must be allowed to weather and compact for at least 72 hours before applying the marking. In the case of smooth polished surfaces, e.g. smooth concrete, old asphalt surfacings with smooth polished surface stones, and/or where the method of application requires or the Engineer directs, a tack coat shall be applied to the surface prior to the application. The tack coat shall be as recommended by the manufacturer of the thermoplastic material and to the approval of the Engineer. Faulty thermoplastic markings shall be removed if required by the Engineer."

Clause 803.6.2

This Clause shall read as under :

"The road markings shall be laid with the appropriate road marking machinery as approved by the Engineer. The thermoplastic material shall be applied hot either by screeding, extrusion or spraying. After transfer to the laying apparatus , the material shall be laid at a temperature within the range specified by the manufacturer for the particular method of laying being used. For locations or markings which are awkward to do by machine, approved manual methods


shall be used with the prior approval of the Engineer. Where the marking material is applied by means of a machine, it shall be applied in one layer. Before the road marking machine is used on the permanent works, the satisfactory working of the machine shall be demonstrated on a suitable site which is not part of the permanent works. Adjustment to the machine shall be followed by further testing. Only when the machine has been correctly adjusted and approved by the Engineer may the machine be used on the permanent work. The operator shall be experienced in the use of the machine. The rate of application shall be checked and adjusted if necessary before application on a large scale is commenced and thereafter daily. The Contractor shall maintain control over traffic while marking operations are in progress so as to cause minimum inconvenience to traffic compatible with protecting the workmen."

Clause 803.6.3

The last sentence of the third paragraph shall read:

“The glass beads shall be applied at the rate of not less than 400 grams per square meter area.”

Clause 803.6.5

Add the following at the beginning of this Clause :

"The work shall be carried out very carefully to a regular alignment in accordance with the Drawings. Straight edges and templates shall be used if required by the Engineer.

In broken lines, the length of segments and the gap between segments shall be as indicated on the Drawings. If these lengths are altered by the Engineer, the ratio of the lengths of the painted sections shall remain the same.

Lines and curves, whether broken or unbroken, shall not consist of chords but shall follow the correct radius.

(ii) Faulty Workmanship or Materials

If any materials not complying with the requirements is delivered at the Site or used in the Works, or if any sub-standard work is carried out, such material or work shall be removed, replaced or repaired as required by the Engineer, at the Contractor’s own cost. Rejected traffic markings and thermoplastic road marking material that has been splashed or has dripped onto the surfacing, kerbs, structures or other such surfaces shall be removed by the Contractor at his own cost, in such a way that the markings or spilt paint will not show up again later.

Clause 803.7.

Measurement for Payment


Clause 803.7.1.



803-01 Providing and applying two coat of Enamel paint of approved brand on old concrete surface including one coat of approved branded primer after throughly cleaning the surface to give an even shade as per technical specification etc. complete.

Sq m.

803-02

803-03

Painting two coats after filling the surface with approved brand synthetic enamel paint in all shades on new plastered concrete surfaces including one coat of approved branded primer after throughly cleaning the surface to give an even shade as per technical specification etc. complete. Providing and laying of hot applied thermoplastic compound 2.5 mm thick including reflectorising glass beads @ 400 gms per sq m area thickness of 2.5mm is exclusive of surface applied glass beads as per IRC 35 the finished surface to be level uniform and free from streak and hole.

Sq m.

Sq m.

SPECIAL SPECIFICATIONS 1300 BRICK MASONRY

KERALA STATE TRANSPORT PROJECT Part II: Special Specifications Page No. 1300 -1

Clause 1300 BRICK MASONRY

Clause 1315 Measurements for Payment



1300-01 Plastering with cement mortar (1:3) etc. complete as per Technical Specifications.

Square metre.

1300-02 Plastering with cement mortar (1 :6 ) on RR work in sub-structure etc. complete as per Technical Specifications.

Square metre.

SPECIAL SPECIFICATIONS 1400 STONE AND CONCRETE BLOCK MASONRY


Clause 1400 STONE MASONRY

Clause 1413 Measurements for Payment



1400-01 Dry Rubble masonry construction for foundation of retaining wall including all cost ,conveyance and all labour charges etc. complete as per drawing as per technical specifications.

Cubic metre.

1400-02 Random Rubble masonry in cement mortar 1:6 for foundation and superstructure of walls including all cost ,conveyance and all labour charges etc. complete as per drawing andtachnical specifications.

Cubic metre.

SPECIAL SPECIFICATIONS ______________________________

1500 FORMWORK

KERALA STATE TRANSPORT PROJECT Part II: Special Specifications Page No. 1500 - 1

Clause 1500. FORMWORK

Clause 1504. WORKMANSHIP

Clause 1504.5 Replace the dimension “25mm x 25mm” with “20mm x 20mm”


1600 STEEL REINFORCEMENT (UNTENSIONED)


Clause 1600. STEEL REINFORCEMENT (UNTENSIONED)

Clause 1608. MEASUREMENT FOR PAYMENT


“Pay Item No. Name Unit of Measurement

1600-01 Supplying, fitting and placing HYSD steel (Fe 415) reinforcement etc. complete as per the drawing and technical specifications.

M Tonne


1700 STRUCTURAL CONCRETE


Clause 1700.

STRUCTURAL CONCRETE

Clause 1704.

PROPORTIONING OF CONCRETE

Add the following at the end of this Clause

“In proportioning concrete, the quantity of both cement and aggregate shall be determined by weight. Where the weight of cement is determined by accepting the manufacturer’s weight per bag, a reasonable number of bags shall be weighed separately to check the net weight. Where cement is weighed from bulk stock at site and not by bag, it shall be weighed separately from the aggregates. Water shall either be measured by volume in calibrated tanks or weighed. All measuring equipment shall be maintained in a clean, and serviceable condition. Their accuracy shall be periodically checked.

It is most important to keep the specified water-cement ratio constant and at its correct value. To this end, moisture content in both fine and coarse aggregates shall be determined as frequently as possible, frequency for a given job being determined by the Engineer according to the weather conditions. The amount of mixing water shall then be adjusted to compensate for variations in the moisture content. For the determination of moisture content in the aggregates, IS:2386 (Part III) shall be referred to. Suitable adjustments shall also be made in the weight of aggregates to allow for the variations in weight of aggregates due to variation in their moisture content.”

Clause 1705.

ADMIXTURES

This Clause shall read as under :

“Duly tested admixtures/additives conforming to IS:6925 and IS:9103 (without replacement of cement) may be used subject to satisfactory proven use, with the approval of the Engineer. Admixtures generating Hydrogen or Nitrogen and containing chlorides, nitrates. Sulphides, sulphates and any other material liable to affect the steel or concrete shall not be permitted.”

“The general, physical and chemical requirements shall be as per Clause 1012.”


Clause 1707.

EQUIPMENT

Para 1 of this Clause shall read as under :

“Unless specified otherwise, equipment for production, transportation and compaction of concrete shall be as under:

a) For production of concrete:

(i) “Batching and mixing of the concrete shall be done in a concrete batching and mixing plant fully automatic with a minimum capacity of 15 cum. per hour. The plant shall be approved by the Engineer.

(ii) In special cases, for culverts, the Engineer may allow mixing of concrete by a diesel or electrically operated mechanical mixer with integrated weigh batching facility having a capacity of 500 litres and automatic water measuring system.”

Clause 1712

PROTECTION AND CURING

Clause 1712.2

Water Curing

Add the following at the end of para 1.

“Wherever possible, use of water sprinklers or perforated pipes should be encouraged for curing of concrete. Such arrangements must be maintained for a minimum period of 14 days after concreting.

Approved concrete curing compounds should be preferred where water curing cannot be done reliably.”

SPECIAL SPECIFICATIONS 1900 STRUCTURAL STEEL


Clause 1908. Measurement for Payment



1900-01 Providing and applying two coat of Enamel paint of approved brand on steel surface including one coat of approved branded primer after throughly cleaning the surface to give an even shade as per technical specification etc. complete.

Sq m


2100 OPEN FOUNDATIONS





2100-01 Plain Cement Concrete Grade M15 using concrete mixer including cost of conveyance and all labour charges etc complete as per drawing and technical specifications.

Cubic meter

2100-02 Reinforced Cement Concrete Grade M20 using concrete mixer including cost of conveyance and all labour charges etc complete as per drawing and technical specifications.

Cubic meter


2300 CONCRETE SUPERSTRUCTURE





2300-01 Reinforced Cement Concrete M 25 in super structure etc including centring and shuttering all complete excluding reinforcement as per Drawing and Technical Specifications.

Cubic meter

SPECIAL SPECIFICATIONS 2500 RIVER TRAINING WORK, PROTECTION WORK Clause 2504 Amend the title of this clause as under:

KERALA STATE TRANSPORT PROJECT Part II: Special Specifications Page No. 2200-2500 - 1

Clause 2504 “PITCHING/REVETMENT/FILTER MEDIA BEHIND

STRUCTURES”

Clause 2504.1 Description Add the following sentence at the end of this clause: “The work also includes providing filter media under stone

pitching, behind abutments, wing/return wall etc.”

Clause 2509 MEASUREMENTS FOR PAYMENT Add the following at the end of this Clause:

"Pay Item No. Name Unit of

Measurement

2500-01

Providing and laying Pitching of 150 mm thickness on slopes including filter media of 200 mm thickness with boulder apron laid dry in front of toe of embankment complete satisfying the requirements laid down in clause 2504.2.2. of MoRTH specifications.

Cubic meter

2500-02

Providing and laying Pitching of 150 mm thickness on slopes including filter media of 200 mm thickness with boulder apron laid dry in front of toe of embankment complete satisfying the requirements laid down in clause 2504.2.2. of MoRTH specifications. Providing and laying of Filter media with granular materials/stone crushed aggregates satisfying the requirements laid down in clause 2504.2.2. of MoRTH specifications behind culvert abutment to a thickness of 600 mm with smaller size towards the soil and bigger size towards the wall and provided over the entire surface behind abutment, wing wall and return wall to the full height compacted to a firm condition complete as per drawing and Technical Specification.

Cubic meter



2700 WEARING COAT AND APPURTENANCES


Clause 2706 WEEP HOLE


“Weep holes shall be provided in solid plain concrete/reinforced concrete, brick or stone masonry abutments, wing walls, return walls, retaining walls and lined drains as shown in the drawings or as directed by the Engineer to drain moisture from the back filling. Weep holes shall be provided with 100 mm dia A.C. pipe or PVC pipe (IS 4985) and shall extend through the full width of concrete/masonry with slope of about 1 vertical: 20 horizontal towards the external face.

The spacing of weep holes shall generally be 1 m in either direction with the lowest at about 150 mm above the low water level or ground level whichever is higher or as directed by the Engineer.”

Clause 2708. MEASUREMENTS FOR PAYMENT



2700-01 Providing weep holes in Brick masonry/Plain/ Reinforced concrete abutment, wing wall/ return wall with 100 mm dia P.V.C pipe, extending through the full width of the structure with slope of 1V :20H towards drawing foce. Complete as per drawing and Technical Specifications

Each


3000 MAINTENANCE


Clause 3004 BITUMINOUS WORK IN CONNECTION WITH MAINTENANCE AND REPAIRS

This Clause shall be deleted and substituted as under: Clause 3004.2 Filling Pot-holes and Patch Repairs Clause 3004.2.1 Scope This work shall include repair of pot-holes and patching of all types

of bituminous surfaces along existing carriageway which remains both inside and outside the areas of pavement improvement works. The location type and area of the repair works shall be as directed by the Engineer. Repair shall be carried out with a bituminous mix either produced at plant site or at the site itself with manual method of mixing and placed at site in the pot holes or in patches after trimming the pot-holes or depression to proper shape and depth, side painting with tack coat and compacting the layer.

Clause 3004.2.2 Materials The materials used for the pot-holes and patch repair of bituminous

surface shall be of the same type as used for the existing bituminous surface. A mix superior to the one on existing surface can also be considered appropriate for repair work. An emulsified bitumen mix compatible with the existing layer shall also be considered appropriate.

The grading of aggregates and bitumen content of the mix used for such patch repair shall be in accordance with Clause 501.

Clause 3004.2.3 Preparation of the Area for Pot-holes and Patch Repair The areas to be patched shall be agreed with the Engineer. They

shall be cut/trimmed either with saw hammer or hand tools like chisels, pick-axes etc., such that the areas are in the shape of rectangles or squares. The edges shall be cut vertically upto the level where the lower layer is suitable without any loose material. The areas shall be thoroughly cleaned with compressed air or any appropriate method approved by the Engineer to remove all dust and loose particles. The areas shall be tacked or primed with cutback or emulsion depending upon whether the lower layer is bituminous or granular in nature. The sides, however, are to be painted with hot tack coat material using a brush or spray. The prime coat and tack coat shall conform to Clauses 502 and 503 of these Specifications, respectively.

Clause 3004.2.4 Backfilling Operations The mix to be filled shall be either a hot mix or a cold storable mix

(using bituminous emulsion). Mixing shall be done in a plant of suitable capacity. It shall be placed in thickness not more than 100 mm (loose). It shall be compacted in layers with roller/plate compactor/handroller/rammer. While placing the final layer, the mix shall be spread slightly proud of the surface so that after rolling, the surface shall be flush with the adjoining surface. If the area is large, the spreading and levelling shall be done using hand shovel and wooden straight edge. During the process of


compaction with roller or other means, the surface level shall be checked using a 3 m straight edge.

Clause 3004.2.5 Measurements for Payment Filling of pot-holes and patch repairs shall be measured in square

metre. Clause 3004.2.6 Rate Contract unit rate for filling for patch repairs shall be in full

compensation for : (i) Handling and Plugging the patch repair material. (ii) Excavation as required and disposing of the materials within

all lifts and lead (iii) furnishing all materials required; (iv) works involved in trimming, tacking, priming with cutback or

emulsion; (v) all labour, tools, equipment and incidentals to complete the

work in accordance with Specifications. (vi) Carrying out the work in part widths of road where directed

by the Engineer. "Pay Item No. Name Unit of

Measurement

3004-01 Filling Pot-holes and Patch Repairs with Bituminous concrete, 40mm. Removal of all failed material, trimming of completed excavation to provide firm vertical faces, cleaning of surface, painting of tack coat on the sides and base of excavation as per clause 503, back filling the pot holes with hot bituminous material as per clause 504, compacting, trimming and finishing the surface to form a smooth continuous surface, all as per clause 3004.2

Square metre

Clause 3006 CLEANING AND REPAIR OF DRAINS Clause 3006.1 Scope The work of cleaning of drains shall include removal of earth,

muck, rubbish, organic and inorganic materials from the earthen or Pucca drain including their disposal, de-watering and making temporary diversions of water etc. The drains shall be repaired if required which includes repairs to lining, beds; pointing & plastering with Cement mortar 1:3 the covered drains shall be cleaned after removing the cover and replacing the same after completion of cleaning operations.

Clause 3006.2 Material The material to be used for repair shall be in accordance with

Clause 1000.


Clause 3006.3 Procedure The work shall be carried out manually or by machines as per

directions of Engineer. The work shall be carried in such a manner that the existing structure of the drain does not get damaged. The contractor shall be fully responsible to make good the dames caused while cleaning operations as per direction of Engineer. In case Extra earth is needed for providing proper bed slope or side walls, the same shall deemed to be included under the cleaning operations as this is incidental to work. For covered drains the cover shall be removed carefully and replaced after the operation of cleaning is completed.

Clause 3006.4 Measurement for payment Cleaning and repair of drains shall be measured in running meters

irrespective of cross sectional area. The earthen drains and Pucca drains shall be measured separately and paid under relevant item of BOQ.

Clause 3006.5 Rate The contract unit rate of cleaning and repair of drains shall be

payment in full compensation for 1. Cleaning & removal of earth, muck, rubbish, organic &

inorganic materials and disposal of the same within a lead of 1 km

2. De-watering, making temporary diversion of water for cleaning operations.

3. Repair to lining of drain in beds, sidewalls, including plastering & pointing with CM 1:3 where necessary.

4. The extra earth need for providing proper bed sloped or repairs to side slopes for earthen drains.

5. Removal and re-fixing the cover of drains in case of Covered Pucca drains.

6. All tools, equipment, manpower, materials and incidentals to complete the work in accordance with the above specification.


3006-01 Cleaning and repairing the existing lined drains Cleaning and repairing the existing lined drains, cleaning the area at the inlet, outlet and inside the barrel of the CD works including cleaning, grubbing of grass, vegetations etc, and disposal of surplus material including all leads and lifts as per technical specifications.

Sq m


a) For drains having no covering slabs Sq m

b) For drains having covering slabs 10 to 12 cm thick slab

Sq m

c) Culverts Clearance Sq m

GOVERNMENT OF KERALA PUBLIC WORKS DEPARTMENT … · government of kerala public works department...

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