Improvement of structural life Composite ROBs and TGBs by Metallising and Conventional painting over various sections (DW-PNVL ,MNKD-PNVL, KYN-LNL) of Mumbai division. (8 Bridges)

Metallizing of steel work of girders with sprayed aluminium after surface preparation by Sand/grit blasting, followed by one coat of etch primer (IS:5666) & one coat of Zinc Chrome 2 primer (IS:104) and two coats of aluminium paint (IS:2339) with all labour, T&P and material as a complete job duly conforming to all relevant specifications and process given under Clause 39 of IRS- B1-2001. Note: Nominal Thickness of sprayed Aluminium coating shall be 150 microns. DFT of Zinc chrome primer shall be 25-30 microns and DFT of each coat of Aluminium paint shall be 12-14 microns. For maintenance work under running traffic

Supply, fabrication and erection of steel members to replace existing corroded members of built up section made up of MS plate, angles, channels of different thickness and sizes including painting with one coat of ready mix paint Zinc Chromate priming to IS:104 followed by one coat of ready mix paint red-oxide Zinc Chrome priming paint to IS:2074. Structural steel should 3 conform to IS:2062 E250- Grade'B0'. Fabrication and erection to be as per existing design initially by bolts and nuts and finally by rivetting during the sanctioned traffic block. Rate includes cutting of new steel work, removal of rivets by drilling, dismantling of any existing members required for inserting fabricated members, fixing of new fabricated built up members with all tools, plants, labour, consumables, machinery and accessories etc. Work will be executed as per IRS:B 1-2001. Note: Painting shall be paid extra under relevant item.

Supplying and changing of corroded worn-out and loose rivets of any size at any location of the bridges with or without traffic blocks including all tools, plants, machinery complete in all respects. For Rivets of size up to 25mm dia.

Removing all loose concrete, cleaning rust with dusting compound & water jet, 5 drying, replacing worn out reinforcements by welding new reinforcement for making up lost steel section, applying approved anti-corrosive polymer coating over the damaged area to proper profile, providing polymer mortar (up to 20mm thickness) or polymer concrete (more than 20mm thickness) consisting of cement, sand, 6mm down chips where required and polymer as per manufacturers' specification. The rate includes curing for 14 days, all materials, consumables, labours, tools and plants, scaffolding/staging with all lead and lift. Note: Cost of reinforcement, if used, to be paid separately. 20mm thick polymer mortar

Removing all loose concrete, cleaning rust with dusting compound & water jet, drying, replacing worn out reinforcements by welding new reinforcement for making up lost steel section, applying approved anti-corrosive polymer coating over the damaged area to proper profile, 6 providing polymer mortar (up to 20mm thickness) or polymer concrete (more than 20mm thickness) consisting of cement, sand, 6mm down chips where required and polymer as per manufacturers' specification. The rate includes curing for 14 days, all materials, consumables, labours, tools and plants, scaffolding/staging with all lead and lift. Note: Cost of reinforcement, if used, to be paid separately. 20mm - 50mm thick polymer concrete

Applying pre-packed cement based polymer mortar of strength 45 Mpa (28 days) for replacement of spalled concrete with average thickness of 10mm as per manufacturer's specification and approved procedure.

Item Breakup - 1-MS items

Existing girders with old paints

Surface preparation for painting of bridge Sqm plate/composite girders and other steel structures where the finishing coat shows signs of deterioration; but primer coat of paint is sufficiently in good condition and there are no signs of rusting etc. Surface shall be cleaned free from oil grease, scaling and other foreign matters without disturbing the primer coat {Rate includes cost of labour, consumables, tools & plants, scaffolding, jhoola, ladder etc.} BR.LINE-HQ-ENGINEERING/CENTRAL RLY Painting of cleaned plate/composite bridge girders including all scaffolding along with provision of Jhoola / hanging scaffolding ladders etc. where required.

With one coat ready mix Zinc Chromate Sqm conforming to IS:104 with DFT of 25-30 Microns followed by one coat of Zinc Chromate red oxide conforming to IS:2074 DFT of 25 Microns

With two coats of Aluminium paint in dual Sqm containers conforming to IS:2339 with DFT of 15 - 20 Microns for each coat. Surface preparation of steel work of bridge plate/composite girders by cleaning with scrappers and/or wire brushes to remove all rust and loose or perished paint to prepare perfectly clean & dry bare metal surface free from all dirt/foreign material & ready for initial coat of paint for new or existing steel girders. Rate includes cost of labour, consumables, brushes, tools & plants, ladders, scaffoldings, jhoola, hanging scaffolding staging etc. 5 041221(041280) Extra for working under traffic conditions Sqm 2100.00 5.31 11151.00 over items 041220 to 041274 [RATE = 10%] 6 041240(041280) Extra for working under traffic conditions Sqm 9797.00 2.60 25472.20 over items 041220 to 041274 [RATE = 10%] Painting of cleaned plate/composite bridge girders including all scaffolding along with provision of Jhoola / hanging scaffolding ladders etc. where required. 7 041261(041280) Extra for working under traffic conditions Sqm 2100.00 8.35 17535.00 over items 041220 to 041274 [RATE = 10%] 8 041263(041280) Extra for working under traffic conditions Sqm 11900.00 8.73 103887.00 over items 041220 to 041274 [RATE = 10%] Total 1738295.20