Recovery and Reconstruction of RCC Bridge Approach at 7th Km of Sensua Naharoni Ali under NDRF(PDNA-2022) for the year 2025-26 for the year 2025-26, Khowang LAC

Excavation for structures : Earth work in excavation for structures as per drawings and technical specifications Clause 305.1 including setting out, construction of shoring and bracing, removal of stumps and other deleterious material and disposal upto a lead of 50.00M,dressing of sides and bottom and backfilling in trenches with excavated suitable material. (i) Ordinary soil Upto 3.00M depth

Collection and supply of Sand Gravel containing 60% Sand and 40% Gravel at site free from disintegrated and flaky pieces, vegetables or other deleterious matter and adherent coating etc.(rate including forest royalty and sales tax).

Labour for spreading metal gravel/ granular material on the road surface as directed including dressing and cambering the formation and utilising the loose earth in filling the depression as directed including carriage of gravel within 30 m.

Construction of Subgrade and Earthen Shoulders (Construction of subgrade 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 (300-2) with lead upto 1000m as per technical specification clause 310 (a) From Private Land

By Mix in Place Method (Construction of granular sub-base by providing close graded material, spreading in uniform layers with motor grader on prepared surface, mixing by mix in place method with rotavator at OMC, and compacting with vibratory roller to achieve the desired density,complete as per cl. 401( with an initial lead of 5 Km.) (ii) For Grading II Material

Water Bound Macadam (Providing, laying, spreading and compacting stone aggregates of specific sizes to water bound macadam specification including spreading in uniform thickness, hand packing, rolling with vibratory roller 8-10 tonnes in stages to proper grade and camber, applying and brooming requisite type of screening/binding material to fillup the interstices of coarse aggregate,watering and compacting to the reqd. density ( with all lead) By Manual Means Grading II Using screening type B (11.2mm Agg)

Water Bound Macadam (Providing, laying, spreading and compacting stone aggregates of specific sizes to water bound macadam specification including spreading in uniform thickness, hand packing, rolling with vibratory roller 8-10 tonnes in stages to proper grade and camber, applying and brooming requisite type of screening/binding material to fillup the interstices of coarse aggregate,watering and compacting to the reqd. density ( with an initial lead of 5.0 km. ) By Manual Means Grading III Using screening type B(11.2 mm Agg.)

Prime coat: 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 0.7--1.00 kg/sqm using mechanical means as per Technical specification C. 502.

Tack Coat: Providing and applying tack coat with bitumen emulsion(RS-1) using emulsion distributor at the rate of 0.25 to 0.30 kg per sqm on the prepared granular surface treated with primer and cleaned with Hydraulic broom as per Technical Specification Clause 503.

Open - Graded Premix Surfacing : Providing, laying and rolling of open - graded premix surfacing of 20 mm thickness composed of 13.2 mm to 5.6 mm aggregates either using penetration grade bitumen to required line, grade and level to serve as wearing coarse on a previously prepared base, including mixing in a suitable plant laying and rolling with a three wheeled roller 80-100kN static roller capacity,finished to required level and grades to be followed by seal coat of either Type-A or Type B or Type C as per Technical Specification Clause 508. Case-II By Mechanical Means (i) Bitumen (S-90)

Seal Coat: Providing and laying seal coat sealing the voids in a bituminous surface laid to the specified levels, grade and cross fall using Type A,Type B & Type C as per Technical Specification Clause 510. B.Mechanical Means Case-II:Type B (i) Bitumen (S-90)