Special repairs to substructure of Sardar Vallabhai Patel bridge i.e. Parallel bridge of Visakhapatnam Port

Surface Preparation: Labour charges for chipping the spalled and old concrete of the RC Structural Element. Check for the phenolphthalein test, and if there is no change in colour, chip the same further down until it reaches the good or uncontaminated concrete. Clean the surface and make sure that it is clean and free from loose particles. The rate shall include the cost of all the operations, Working platform & scaffolding and etc as required and as directed by the Engineer-in-charge complete. All labour and materials

Anchoring the Main Reinforcement: Mark the position of holes to be drilled for anchoring the rebar into the RC Pile cap. Drill 16mm diameter holes in the marked places using a rotary hammer drilling machine of reputed make to a depth of 75 mm into the RC Pile cap. Clean the holes neatly and wash them with a jet of water. Allow it to dry and make sure that no fine dust particles are present in the holes. Mix the base and hardener of the polyester resin using a spatula and push the same into the holes with a proper tool so that the bottom most point of the hole receives the material. The filling is to be done for a minimum portion of 1/3rd of the hole depth. Now insert the rebar which needs to be anchored for the provision of main reinforcement, gently and finish the surface around the rebar area using the same material which comes out of the hole excessively. The rate shall include the cost of all the operations, Working platform & scaffolding and etc as required and directed by the Engineering-in-charge complete. All labour and materials.

Additional Reinforcement: TMT HYSD rebars as per the drawing shall be fabricated and placed in position. The cost of all materials and all fabrication charges and all labour charges, Working platform & scaffolding and etc and as directed by the Engineer-in-charge complete.

Shear Connectors: Drilling 12mm diameter holes up to a depth of 75mm maximum and fixing 8mm diameter L- shaped anchor rods as shear connectors at every 500mm c/c on the surfaces of the Pile or any other structural member, as the case may be. Clean the same using water and make sure that there are no fine particles present in the hole. Mix the base and hardener of the polyester resin, like Lokfix S/P manufactured by Fosroc or equivalent, thoroughly with the spatula. Fill the drilled and cleaned holes to a minimum depth of 1/3rd of the hole with the prepared polyester resin. Make sure that the resin has reached till the end of the hole. At this stage, push the shear connector gently into the hole and finish the excess resin which comes out of the hole, and allow the shear connectors not to be disturbed for a minimum of 20 minutes -complete. The rate shall include the cost of all the operations, Working platform/ Scaffolding and etc as required and as directed by the Engineer-in-charge complete. All labour and materials.

Anti-corrosive Coating: Clean reinforcement using Reebaklens RR of Fosroc or equivalent; otherwise, clean the rebar free of foreign material. Mix the base and hardener of the anti-corrosive coating like Nitozinc Primer of Fosroc or equivalent, mechanically using a slow-speed, heavy-duty drilling machine fitted with a mixing paddle. Apply the mixed materials to the cleaned rebar at 45 microns/coat and total dry film thickness (DFT 90) microns in 2 coats and allow it to dry completely. The rate shall include the cost of all the operations, Working platform/ Scaffolding, etc, as required and as directed by the Engineer-in-charge complete. All labour and materials.

Formwork: Centring and shuttering, including strutting, propping, etc., as per the required line and length at all different floor levels as per the standard specification, is complete. Form work should be rigid to prevent loss of grout or mortar concrete from the concrete at all stages & appropriate to the methods of placing & compacting as per standard specification. It should be made of suitable material, i.e., timber, plywood, or plastic, depending upon the type of finish specified. The rate shall include the cost of all the operations, Working platform/ Scaffolding, etc, as required and as directed by the Engineer-in-charge complete. All labour and materials.

Micro- Concrete: Stock sufficient quantity of micro concrete and 12mm downgraded chips on site to enable the completion of the pouring in a continuous operation. An approved concrete mixer or a slow-speed heavy- duty drilling machine fitted with a mixing paddle shall be used. Mix the micro concrete and the 12mm down grade chips in the ratio of 1:0.5 by weight with the required quantity of water as per the data sheet and place the same in the prefixed formwork well before the epoxy jointing compound dries up. Check for any surface defects, and if so, apply the polymer-modified mortar - complete. The rate shall include the cost of all the operations, Working platform/ Scaffolding, etc, as required and as directed by the Engineer-in-charge complete. All labour and materials.

Curing Compound: Immediately after striking the form work or after completion of the repair works, the surface should be sprayed with water once and followed by application of membrane-based curing compound like Nitobond AR of Fosroc or equivalent diluted with water in the ratio of 1: 1 as a curing membrane - Complete. The rate shall include the cost of all the operations, etc, as required and as directed by the Engineer-in-charge complete. All labour and materials.complete

Protective coatings for Environmental face using Dekguard S of Fosroc: Providing and applying a single component high build elastomeric, crack - bridging, resistant to CO2 and Chloride ion diffusion, UV resistant, breathable acrylic coating with elongation at break exceeding 200% using Dekguard S of Fosroc or equivalent material applied in two coats(Each coat 150 micron WFT) on acrylic based primer at an average thickness of 150 microns DFT in two coats including acrylic resin basedprimer as per recommendation of the manufacturers. The rate shall consist of the cost of all the operations, Working platform/ Scaffolding, etc, as required and as directed by the Engineer-in-charge complete. All labour and materials.

Debris Removing: Loading, transporting, dumping and levelling the debris etc, in the hollows of low-lying area inside the harbour within a lead of 2 Km (Viz Between 1 Km to 2 Km) as directed, all details as per relevant specification and including all labour, transport, tools, equipments, fuel, etc, complete. (No deduction will be made for voids)

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