Special repair and other civil works of Repeater Station Building at Hirodih ADDITIONAL WORKS

Amount

SH: RCC Work

Reinforced cement concrete work in beams, suspended floors, roofs having slope up to 15° landings, balconies, shelves, chajjas, lintels, bands, plain window sills, staircases and spiral stair cases above plinth level up to floor five level, excluding the cost of centering, shuttering, finishing and reinforcement with 1:1.5:3 (1 cement : 1.5 coarse sand(zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources)

Centering and shuttering including strutting, propping etc. and removal of form for:

(a) 40 mm thick with 20 mm nominal size stone aggregate

SH: FLOORING

Cement concrete flooring 1:2:4 (1 cement : 2 coarse sand : 4 graded stone aggregate) finished with a floating coat of neat cement, including cement slurry, but excluding the cost of nosing of steps etc. complete.

(a) 40 mm thick with 20 mm nominal size stone aggregate

SH: REPAIRS TO BUILDING

Providing & fixing single scaffolding system on the exterior side of building made with 50 mm dia (approx) bamboo tree 1.00 metre centre to centre horizontal & vertical for repair of projected roof maintaining it in a serviceable condition for the required duration as approved and removing it there after complete as per direction of Engineer-in-charge.

SH: WATERPROOFING

Grading roof for water proofing treatment with

(a) Cement concrete 1:2:4 (1 cement : 2 coarse sand : 4 graded stone aggregate 20mm nominal size)

(b) Cement mortar 1:3 (1 cement : 3 coarse sand)

SH: REPAIRS & REHABILITATION

Chipping of unsound/weak concrete material from slabs, beams, columns etc. with manual Chisel and/ or by standard power driven percussion type or of approved make including tapering of all edges, making square shoulders of cavities including cleaning the exposed concrete surface and reinforcement with wire brushes etc. and disposal of debris for all lead and lifts all complete as per direction of Engineer-In-Charge.

(a) 75mm average thickness

(b) 50 mm average thickness

Cleaning of reinforcement from rust from the reinforcing bars to give it a total rust free steel surface by using alkaline chemical rust remover of approved make with paint brush and removing loose particles after 24 hours of its application with wire brush and thoroughly washing with water and allowing it to dry, all complete as per direction of Engineer-In-Charge

(a) Bars upto 12 mm diameter

Providing, mixing and applying bonding coat of approved adhesive on chipped portion of RCC as per specifications and direction of Engineer-In-charge complete in all respect.

Epoxy bonding adhesive having coverage 2.20 sqm/kg of approved make

Replacement of sufficiently damaged reinforcements or providing additional reinforcements with the damaged reinforcements by welding etc. including cost of reinforcement (TMT bar of required dia ),mobilization etc. complete as per direction of Engineer-in-Charge. (work is to be executed upto 20 m heights above G.L).

Repairs of damaged RCC portion in beams, columns floors, roofs having slope upto 15° landings, balconies, shelves, chajjas, lintels, bands, plain window sills, staircases and spiral stair cases above plinth level up to floor five level, excluding the cost of centering, shuttering, finishing and reinforcement with 1:1.5:3 (1 cement : 1.5 coarse sand(zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources).

(a) 75 mm average thicknes

(b) 50 mm average thicknes

Plastering in cement mortar 1:3 (1 cement:3 fine sand) of 6 mm thick admixed with water proofing compound of approved make such as plastocrete super or equivalent confirming to IS 9103-1999,IS 2645-1975 and ASTM C-494-86 Type A @ 0.2% by weight of cement and as per manufacturer specification complete to improve water tightness and workability without increased water content and as per direction of Engineer in Charge.(work is to be executed upto 20 m heights above G.L).

Extra for providing & fixing liquid intgral water proofing materials conforming to IS: 2645 of the approved brand such as ROFF HYPROOF/LATICRETE or equivalent at the rate of 140ml/50kg bag of cement or in proportion as recommended by the manufacturer in RCC/CC/Cement mortar etc. as per direction of Engineer-in-charge. (Note: Integral liquid water proofing material shall be added in the water needed for preparation of RCC/CC/Mortar etc.)

Rajeev Kumar Pandey