Repair and rehabilitation of ROB at 20.50 km on NH- 37(New)/NH-53 (Old) (Silchar Jiribam section) under Annual Plan 2022-23 under PWD, NH Division, Silchar. (Job No.37/AS/2022-23/241)

Amount

Excavation for structures : 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 and backfilling with approved material,complete as per clause 304 of MoRTH specifications of Road and Bridge Works including all accessories,complete as per direction of Engineer in charge . I. In Ordinary Soil A) Manual means a) Without dewatering i) Upto 3m depth

Dismantling of Structures : Dismantling of existing structures like culverts ,bridges,retaining walls and other structure comprising of masonary,cement concrete ,wood work ,steel work,including T&P and scaffolding wherever necessary ,sorting the dismantled material ,disposal of unserviceable material and stacking the serviceable material with with all lift and leads as per clause 202 of MoRTH specifications of Road and Bridge Works including all accessories ,complete as per direction of Engineer in charge . ii. By Manual Means (c) Prestressed/Reinforced cement concrete of grade M-20 and above.

Chipping of deteriorated concrete and removal of all loose and friable materials and fully exposing rusted reinforcement followed by proper cleaning and removing of rusts and other foreign materials using sand blasting /emery cloths/wire brush etc. including formwork as directed and specified by the department ,complete as per direcion of engineer in charge.

Replacement of corroded reinforcement by cutting and welding new reinforcement of dia upto 25 mm ,including lapping on both sides to the specified length as directed and as per relevant IS/IRC codes inclusive cost of Gas,welding rods,higher charge of welding machines etc. including formwork as required (Reinforcement to be measured and paid seperately),complete as per direction of Engineer in charge

Anticorrosive Treatment : A) Supplying and applying two coats of Zinc rich ani-corrosive protective coating with 'Techguard 102' of Choksey Chemicals or equivalent @0.50 Lit per sqm over thoroughly cleaned and prepared steel bars including formwork as directed and specified by the department complete,as per direction of Engineer in charge.

Bonding between old and new concrete surfaces : A) Supplying and applying Epoxy based bonding agent Masterbond EP of Choksey Chemicals or equivalent @ 0.50 Lit per sqm after totally saturating the cleaned concrete surface with clean water for proper proper bonding of old and new concrete including formwork as specified and directed by the department complete,as per direction of Engineer in charge.

Providing and inserting nipples with approved fixing compound after drilling holes ,for grouting including subsequent cutting/removal and sealing of the holes of nipples as necessary after completion of grouting with Cement/Epoxy grout ,as per Technical specifications & clause 2800 MoRTH specificatioins of Road and Bridge works including all accessories ,complete as per direction of Engineer in charge.

Sealing of cracks/porous concrete with Epoxy grout by injection through nipples complete as per Clause 2803.1 of MoRTH specifications of Road and Bridge Works including all accessories ,complete as per direction of Engineer in charge.

Supplying ,fitting and placing TMT Bar reinforcement in sub-structure complete as per drawing and technical specificatioin and section I) TMT CRS (Fe-500) reinforcement bar

Concreting of the structure with free flow nonshrink cementious microconcrete with Rendorec RG of Fosroc or equivalent after proper mixing with clean water including formwork followed by proper curing for 28 days as per manufacturer's specifications complete and as directed by the Department ,complete as per direction of Engineer in Charge.

Structural Strengthening with carbon Fibre : A) Patching in depression of concrete surface wherever necessary by laying epoxy putty ,Nitocote VF of Fosroc Chemicals or equivalent @ 1 Lit per sqm after proper surface preparation and proper scraping of concrete protrusion as specified and directed by the department complete including formwork ,complete as per direction of Engineer in charge

Structural Strengthening with carbon Fibre : B) Applying Nitowrap 410 saturant Fosroc Chemicals or equivalent with wet film thickness @ 250 microns (0.27 Lit per sqm) over a coat of saturant epoxy primer Nitowrap 30 of Fosroc Chemicals or equivalent @ 0.11 Lit per sqm with brush followed by fixing carbon fibre composite system Nitowrap EP(CF) of Fosroc Chemicals or equivalent by pressing on the saturant and impregnate the same by applying a final coat of Nitowrap 410 Saturant Fosroc chemicals or equivalent as specified and directed by the department complete including formwork , complete as per direction of engineer in charge.

Structural Strengthening with carbon Fibre : C) Applying cement plaster to protect the carbon fiber from UV Ray as well as external damager as specified and dirrected by nthe department complete including formwork,complete as per direction of Enginer in charge

Repairing of RCC Railing carring out repair of RCC M30 Railing to bring it to the original shape.

Painting on concrete surface (Providing and applying 2 coats of water based cement paint to unplastered concrete surface after cleaning the surface of dirt, dust, oil, grease, efflorescence and applying paint @ of 1 litre for 2 Sq.m. ),complete as per Clause 800 of MoRTH specifications of Roads and Bridge Works including all accessories ,complete as per direction of Engineer in charge : For RCC Railing

Back filling behind abutment, wing wall and return wall complete as per drawing and Technical specification and as per clause 710.1.4 of IRC :78 & Section 2200 of MoRTH specifications of Road and Bridge Works including all accessories ,complete as per direction of Engineer in charge : With Granular material

PCC M15 Grade leveling course below approach slab complete as per drawing and Technical specification ,as per section 2700 of MoRTH SPECIFICATIONS OF Road and Bridge works including all accessories complete as per direction of Engineer in charge

Reinforced cement concrete approach slab including reinforcement and formwork complete as per drawing and Technical specification.A) With M-30 Grade concrete & TMT CRS (Fe-500 ) grade rebar.

Furnishing and Placing Reinforced/Prestressed cement concrete in super-structure as per drawing and Technical Specification' including steel shuttering formwork.Using Concrete Mixer .Height upto 10.00 m.

Dismantling of existing wearing coat

Providing laying mastic asphalt wearing coat

M/S. Prakalpa