E-TENDER FOR EXTERNAL STRUCTURAL REPAIRS AND EXTERNAL PAINTING OF NABARD REGIONAL OFFICE, CHENNAI

Scaffolding Works Supplying and erecting Safety Scaffolding arrangement using Cup-lock system, having a standard width of 1.20m, provided for working platform in the peripheral area of the high rise building. The Safety Scaffolding arrangement shall be formed by using vertical hot rolled steel pipe of 40mm diameter with a thickness of 2.90mm. The vertical pipe shall have a steel cup arrangement of 80mm diameter to hold the horizontal ledger pipe with top movable lock arrangement made up of Cast Iron. The above cup arrangement to hold the ledger pipe shall be welded to the vertical pipe at a distance of every 0.50m c/c. The horizontal ledger pipe with various lengths ranging from 0.90m to 2.0m may be used with a diameter of 40mm and with a thickness of 2.90mm made up of Hot rolled steel. The horizontal ledger pipe shall be provided at a vertical height of every 1m. Both the ends of the horizontal ledger pipe shall be welded with a steel plate of 100mm length and a width of 60mm at the center and 35mm at both the ends. Suitable double nylon safety net of approximately 25 mm mesh size shall be provided at about 4.0 m height from ground level around the building, extending at least 3.0 m from the building edge, wherever required, to protect persons, vehicles and property from falling materials. No extra charges shall be paid for it

Dismantling of doors and windows including removal of frames, hinges and fastenings

Removal of existing Iron Rods

Removal of Horizontal RCC Fin Strips Carefully chipping, cutting and removing existing damaged horizontal RCC fin strips / projections, including removal of loose and spalled concrete upto 75mm thickness, cutting/removal of embedded reinforcement where required, taking necessary safety precautions, protecting adjoining surfaces, lowering of dismantled materials, stacking of serviceable materials if any, disposal of debris outside the site as directed by the Engineer-in-Charge, including all labour, tools, tackles, equipment and incidentals complete.

RCC Fin Wall Anchoring Drilling holes of suitable diameter and depth in RCC beams and fin walls as per approved structural drawings, fixing reinforcement/anchor rods with approved chemical anchoring system, cleaning and treating exposed reinforcement with anti-corrosive coating, applying bonding agent, and restoring the damaged portions with polymer-modified repair mortar/micro-concrete, including curing, finishing, scaffolding, disposal of debris, and all labour, materials, tools, and incidentals complete as directed by the Engineer-in-Charge and as shown in the drawings.

TMT Reinforcement Works Supplying, fabricating and placing in position Ribbed Tor Steel / TMT reinforcement grills of all variety like HYSD/CTD/TMTand all grade like Fe 500, Fe550D, Fe 500 D etc., for all RCC works as per design given including cost of steel reinforcement and G.I. binding wire, wastage etc. complete complying with standard specification and as directed by Engineer-in-charge.

Rebar Treatment & Bonding Carefully remove damaged plaster and loose concrete from the affected areas, clean the exposed reinforcement thoroughly by removing dirt, rust, scales, and other corrosion products using approved rust remover and mechanical cleaning methods. Apply epoxy zinc-rich primer to the cleaned reinforcement for corrosion protection. Apply approved epoxy bonding adhesive having coverage 2.20 sqm/kg of approved make between the hardened existing concrete surface and the fresh repair concrete/mortar, complete as directed by the Engineer-in-Charge.

Wire Mesh Fixing Providing and fixing hard drawn steel wire fabric of size 75 x25 mm mesh of 3 mm dia or other suitable size wire mesh to be fixed & firmly anchored to the concrete surface by means of “L” shaped mild steel shear key welded with existing reinforcement including the cost of materials, labour, tool & plants as approved by Engineer-in-charge.

Shuttering & Formwork Supplying and erecting centering for plane surfaces such as RCC Floor/Roof Beam, Lintels, Cantilever Beams, Bed Blocks etc.. with necessary supports and strutting upto 3.60m height in all floors with all cross bracings using MS Sheets made of 10 gauge thick welded with MS angle of Size 25mm x 25mm x 3mm for boarding laid over Steel adjustable Span of Size 2m x 2m (expandable upto 3.60m) and Silver Oak Joists of Size 10 x 5 cm spaced at 50cm to 60cm c/c and supported by Steel Adjustable Telescopic Props of Size 2m x 2m (expandable upto 3.60m) made with outer steel pipe with dia 50mm (3.60mm thick) and inner steel pipe with dia 40mm (2.90mm thick) Spaced at not more than 50 to 60cm c/c , etc complete complying with standard specifications. Steel adjustable span and Steel Adjustable telescopic props shall be provided as directed by the Engineer-in-charge.

RCC / Micro-Concrete Jacketing Provide RCC jacketing to the existing fin walls as detailed in the approved structural drawings, including surface preparation, drilling and fixing dowel bars/anchors with chemical adhesive, placing reinforcement, shuttering, and casting with free-flow, non-shrink, high-strength cementitious micro-concrete (minimum compressive strength 45 MPa at 28 days), such as MasterEmaco S 488, Fosroc Renderoc RG, Dr. Fixit Micro Concrete, or approved equivalent, to restore the structural strength, stability, and durability of the fin walls. The work shall include curing, finishing, and all necessary materials, labour, tools, and equipment complete. The elevation jaali shall be installed only after completion of the strengthening works, strictly in accordance with the approved structural drawings and the Engineer-in-Charge's instructions.