Repair and Rehabilitation of Amriti Bridge

Amount

Sand Blasting: Cleaning the exposed corroded Reinforcement as well as worn out concrete by sand blasting with air compressor including all materials, hire charges of machineries and labour etc. all complete as per technical specification and direction of the Engineer-in-Charge.

Anti- corrosive Coating: Providing anti-corrosive protective coating to inhibit the corrosion to HYSD reinforcements including two coats of anti-corrosive coatings of consumption as per manufacturer's specification, cleaning etc. complete as per the direction of the Engineer-in-Charge.

Guniting concrete surface with cement mortar applied with compressor after cleaning surface and spraying with epoxy complete as per Technical Specification (Reference to MORT&H's specification 2807).

Providing and inserting nipples with approved fixing compound after drilling holes for grouting as per Technical Specifications including subsequent cutting/removal and sealing of the hole as necessary of nipples after completion of grouting with Cement/Epoxy (Reference to MORT&H's specification 2800).

Sealing of crack / porous concrete with Epoxy Grout by injection through nipples complete as per clause 2803.1 (Reference to MORT&H's specification 2803).

Sealing of cracks/porous concrete ( within the limits of practical pressure 100kpa -400kpa until refusal ) by injection process through nipples/Grouting complete as per Technical Specification (Reference to MORT&H's specification 2806). Note Add 20% cost over cement as admixture (Anti shrinkage compound). Cement Grout

Epoxy bonding of new concrete to old concrete ( crack/spalling shall be sealed with epoxy injection/grouting coating of epoxy resin @ 0.80kg /sqm should be applied )(Reference to MORT&H's specification 2805).

Patching of damaged concrete surface with polymer concrete and curing compounds, initiator and promoter, available in present formulations, to be applied as per instructions of manufacturer and as approved by the Engineer (Reference to MORT&H's specification 2800). Thickness of patching = 25mm

Dismantling and removing of Damaged Concrete Railing.

Construction of RCC railing of M30 Grade in-situ with 20 mm nominal size aggregate, true to line and grade, tolerance of vertical RCC post not to exceed 1 in 500,centre to centre spacing between vertical post not to exceed 2000 mm, leaving adequate space between vertical post for expansion, complete as per approved drawings and technical specifications (Reference to MORT&H's specifications 2703, 1500, 1600 & 1700).

Clearing and Grubbing Road Land :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, up to a lead of 1000 metres including removal and disposal of top organic soil not exceeding 150 mm in thickness. (Reference to MoRT&H's specification clause 201) In area of thorny jungle

Filter Materials: Providing and laying Filter material underneath pitching in slopes complete as per drawing and Technical specification Gradation of filter , Thickness of filter 200/300 mm (Reference to MORT&H's specification 2504).

Geotextile Filter: Laying of a geotextile filter between cost of materials) pitching and embankment slopes on which pitching is laid to prevent escape of the embankment material through the voids of the stone pitching/cement concrete blocks as well as to allow free movement of water without creating any uplift head on the pitching. (Reference to MORT&H's specifications 700 & 2504).

Boulder Apron Laid without Wire Crates: Protection for Side Slope with Pitching and filter media: Providing and laying Pitching on slopes laid over prepared filter media including boulder apron laid dry in front of toe of embankment complete as per drawing and technical specifications (Reference to MORT&H's specification 2504).

Boulder Apron Laid in Wire Crates: 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).

R.C. Guard post Supplying fitting and fixing R.C. guard post 1.37m long with C.C. 1:2:4 with graded stone chips of 13.2mm down casting , curing complete including cost of providing 4nos.of 12mm dia. rod of length 1.54m as main reinforcement and 6 nos. of round shaped 8mm dia rods used as binders; the placing of the first binder should be at 75mm below the top finished surface and the other 5 nos of binders should be placed at 245mm c/c ; the guard post is of octagonal section with inscribed circle of dia 24cm at the base tapering to corresponding dimensions of 16cm at the top including two coats of painting with best quality synthetic enamel paint of approved make and grade to form 6 nos. horizontal alternate bands in white/tannery yellow and black to 90 cm length standing up above ground after mending good damages if any during striking off shuttering, making hole in ground of 47cm depth and 30cm. minimum dia, fixing the guard posts in the same holes and repacking the earth properly so as to keep the guard posts standing properly erect in correct position true to line and length including carriage of R. C. Guard Post with due care to the site including loading into the truck and unloading at site complete in all respect. With Pakur variety stone chips

Hire and labour charges for staging with sal bullah for super structure of bridge (Major and Minor) including stripping off and removing clearing on completion of work as per design and drawing approved by the Engineer-in-charge.