Emergent Restoration work for approach and piers of Gairganda Bridge at Chainage 2.200 kmp of NH-317 near Birpara, in the district of Alipurduar, West Bengal, during the year 2025-26. Phase-I

Amount

Clearing grass and removal of rubbish up to a distance of 50 metres outside the periphery of the area. (Reference to MoRT&H's specification clause 201)

Earth work in excavation of foundation of structures as per drawing and technical specification, including setting out, construction of shoring and bracing, removal of stumps and other deleterious matter, dressing of sides and bottom, backfilling the excavation earth to the extent required and utilising the remaining earth locally for road work (Reference to MoRT&H's specification clause 304). In Marshy Soil (For areas within river bed)

Providing and construction of a gabian structure for retaining earth with segments of wire crates of size 7 m x 3 m x 0.6 m ( 7.50m x 3.0m x0.6m ) each divided into 1.5 m compartments by cross netting, made from 4 mm galvanised steel wire @ 32 kg per 10 sqm having minimum tensile strength of 300 Mpa ( tensile strength 300-450 Mpa ) conforming to IS:280 and galvanizing coating conforming to IS:4826, woven into mesh with double twist, mesh size not exceeding 100 x 100 mm, filled with boulders with least dimension of 200 mm, all loose ends to be tied with 4 mm galvanised steel wire (Reference to MORT&H's specification 2503.3).

Providing and laying of boulder apron laid in wire crates made with 4mm dia wire dia not less than 4mm GI wire conforming to IS: 280 & IS:4826 in 100mm x 100mm mesh Mesh size not more than 150mm (weaved diagonally) including 10 per cent extra for laps and joints laid with stone boulders weighing not less than 40 kg each ( Tensile strength 300-450mpa, size of wire crates 3.0mx1.50mx1.25 m) (Reference to MORT&H's specification 2503).

Providing and laying boulders apron on river bed for protection against scour with stone boulders weighing not less than 40 kg each template cross wall in dry wall masonry shall be built about a meter thick & to the full height of the specified thickness of appron at 30 mt. interval complete as per drawing and Technical specification (Reference to MORT&H's specification 2503). 1A. Boulder Laid Dry Without Wire Crates.

Construction of embankment with approved material obtained from borrow pits with all lifts and leads, transporting to site, spreading, grading to required slope and compacting to meet requirement of table 300-2 & 300-1 .The size course material in the mix of earth ordinarily shall not be exceed 75mm.(Reference to MoRT&H's specification clause 305). (Using RBM)

Plain/Reinforced cement concrete in open foundation complete all as per drawing and Technical Specifications (Reference to MORT&H's specifications 1500, 1700 & 2200). PCC Grade M15. Height up to 5m.

Construction of sub-grade and earthen shoulders with approved material obtained from borrow pits with all lifts & leads, transporting to site, spreading, grading to required slope and compacted to meet requirement of table No. 300-2 (Reference to MoRT&H's specification clause 305). (carriage from private land upto 10 km distance)

Construction of granular sub-base by providing graded materials such as natural sand/ crushed gravel/crushed stone / combination depending upon the required grading , spreading in uniform layers with motor grader on prepared surface, mixing by mix in place method with rotavator and compacting with vibratory roller to achieve at least 98% of the maximum dry density for the material determined as per IS:2720 (Part 8), complete as per clause 401 desired density, complete as per clause 401 Plant Mix Method. 1A(V) (Grading-V)

Providing, laying, spreading and compacting graded stone aggregate conforming to the grading of table 400-13 revised vide table 2 of IRC : 109 (2015) to wet mix macadam specification including premixing the Material with water at OMC in mechanical mix plant carriage of mixed Material by tipper to site, laying in uniform layers with paver in sub- base / base course on well prepared surface and compacting with vibratory roller to achieve the desired density .The thickness of a single compacted layer shall not be less than 75 mm.(Reference to MoRT&H's specification 406.

Providing and applying primer coat with cationic bitumen emulsion SS1 grade conforming to IS:8887 on prepared porous granular surface including clearing of road surface and spraying primer using mechanical means (Ref. to MORT&H's specification clause 502). On WMM/WBM surface @ 0.70-1.0kg /sqm.

Providing and applying tack coat with Cationic bitumen emulsion (RS1) complying with IS:8887 using emulsion pressure distributor on the prepared bituminous /granular cement concrete pavement surface cleaned with mechanical broom and high pressure air jet (Reference to MORT&H's specification clause 503). A) On Granular surface treated with primer @ 0.25kg-0.30 /sqm.

B) On bituminous surface @ 0.20kg - 0.3kg /sqm

Providing and laying dense graded bituminous macadam with 100-120 TPH batch type HMP using crushed aggregates of specified grading, premixed with bituminous binder of approved grade @ 4.0% (min) for Grading -1 and 4.5% (min) for Grading -2 by weight of total mix and filler(Cement /hydrated lime / Rock dust ) as per table 500-10 and mix design done as per table 500- 11and job mix formula as per clause 505.3.3 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 tandem roller and with pneumatic tyre roller of 12 to 15 tonne weight with a pressure at least 0.56 MPa as directed by E-I-C, and to achieve the desired compaction as per MORT&H specification clause No. 505.3.5 complete in all respects (Reference to MORT&H's specification clause 505). 6(ii) For Grading 2 (26.5 mm nominal maximum aggregate size ) Layer Thickness 50-75mm

Providing and laying bituminous concrete with 100-120 TPH batch type hot mix plant using crushed aggregates of specified grading, premixed with bituminous binder of approved grade@ 5.2% (min) for Gr.-1 & @ 5.4% (min) for Gr.-2 , as per table 500-17, and mix design done as per table 500-10 and job mix formula as per cl. 505.3.3 and filler(Cement /hydrated lime / Rock dust ), 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 tandem roller and with pneumatic tyre roller of 12 to 15 tonne weight with a pressure at least 0.56 MPa as directed by E-I-C to achieve the desired compaction as per clause no 507.3.5 complete in all respects ref. to MORTH specification clause No.507. 8(ii) for Grading-2 ( 13.2 mm nominal maximum aggregate size), Layer thickness:30-40mm

Providing and erecting a "Thrie" metal beam crash barrier comprising of 3 mm thick corrugated sheet metal beam rail, 85 cm above road/ ground level, fixed on ISMC series channel vertical post, 150 x 75 x 5 mm spaced 2 m centre to centre, 2 m high with 1.15 m below ground 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 space of channel section 150 x 75 x 5 mm, 546 mm long complete as per clause 811

Sal-wood work rough dressed including necessary hoisting and fitting, and fixing in position including cost of nails but excluding cost of bolts, nuts and washer in Bridge Work excluding Bridge Floor.

M/S. DDSD CONSTRUCTION CO. (BID ID -3255281)