Construction of RCC overhead water tanks and staircase CAP

Providing and Laying Reinforced cement concrete of grade M-30 in super structure conforming to IS 456-2000 and 13920 latest edition, at all floors and levels for all structural members in all geometrical shapes/ design as per drawings using graded stone aggregate of 20mm and down graded including machine mixing, conveying, placing in position, mechanical consolidation, finishing, curing, etc. complete all as per drawings, specifications & as directed by Engineer in Charge. Notes for RCC Works: a) All RCC works ( Staircase cap, Overhead water tanks, Lift pardi and top slab / beam / columns / any other works at appropriate height) shall be controlled concrete unless otherwise specified and shall be carried out strictly in accordance with the drawings, specifications and as directed by the Engineer in Charge. b) The water tank work shall be as per IS 3370-2009 latest edition c) The rates for RCC works shall be exclusive of cost of reinforcement and form work unless otherwise mentioned. d) All coarse aggregate to be 20mm maximum size and uniformly graded unless otherwise mentioned. e) For all RCC items, the rates quoted shall include the following without any extra cost to the Dept. i) Spacers/cover blocks of same grade to maintain clear cover for reinforcement. ii) Fixing at correct level and in proper alignment the inserts, pipe sleeves, pipe bends, hooks, other pipe specials etc. supplied by/ through the Department. iii) Cut out in slabs, construction joints etc. f) Test for concrete shall be done as per IS 456-2000 and the cost of the same shall be borne by the contractor. For all type of Structural/ RCC Elements with all geometrical shape

Extra for providing RMC (Ready Mixed Concrete) conforming to IS :4926 (latest) in lieu of conventional RCC and PCC items supplied by approved RMC manufacturers for all type of structural elements/ RCC/ PCC elements including transporting, pumping etc. complete as per instruction of the Engineer in charge. Notes: i) The contractor shall obtain prior approval for RMC manufacturer from Engineer in Charge in writing. ii) The rate shall apply for all levels and locations including all type of structure etc. iii) Extra for RMC in lieu of conventional RCC and PCC of any grade mentioned elsewhere shall be measured and paid under this item for substructure & superstructure works.

Reinforcement for RCC work including supplying steel bars of various diameters as required at site of work including loading, unloading, transporting, decoiling, straightening, cutting, bending placing in position and binding with 18 gauge, soft drawn annealed steel binding wire including carrying out various tests as required etc. all as per specifications, drawings & as directed by the Engineer in charge. (Cost of binding wire shall be borne by the contractor & shall not be measured for payment)- Thermo Mechanically Treated bars of grade Fe-550 D manufactured by SAIL, TATA STEEL, JSW and RINL only.

Providing, erecting, fixing in position, striking/ removing and cleaning steel/ timber shuttering & centering for form work including single/ multiple staging at all level & locations for all geometrical shapes in plain, curved surfaces of structural/ RCC elements ( Staircase cap, Overhead water tanks, Lift pardi and top slab/beam works at appropriate height) and including rails, bracings, props, brackets, cutting holes for pipes, slot for chambers etc., providing & applying approved form oil on all surfaces of form work coming in contact with concrete including close hacking of all exposed concrete work after removal of form work, all materials, labour etc. complete as per specifications, drawings & as directed by the Engineer in Charge. (Area of form work in contact with concrete shall only be measured for payment & stop boards for construction joints etc. will not be measured for payment). For all type of structural/ RCC elements including all geometrical shapes and single/ multiple staging at all floors and location. Good quality shuttering materials to be used as approved by EIC.

Providing and applying Cement plaster using READY MIX Plaster (RMP) of approved manufacturer in double coat over concrete/ masonry surfaces in CM 1:4 of thickness inside water tanks to correct line, level, plane, plumb etc., finished smooth with neat cement finish, including preparing the surface, scaffolding, curing etc. all complete as per drawings, specifications and as directed by the Engineer in charge.-20 mm thick smooth finish in two coats on concrete surfaces with water proofing agent @ 2% by weight of cement or as per manufacturers specifications - plastering for inside surface of water tank.

Providing and laying integral cement based water proofing treatment including preparation of surface as required for treatment of roofs, balconies, terraces etc consisting of following operations: (a) Applying a slurry coat of neat cement using 2.75 kg/sqm of cement admixed with water proofing compound conforming to IS. 2645 and approved by Engineer-in-charge over the RCC slab including adjoining walls upto 300 mm height including cleaning the surface before treatment. (b) Laying brick bats with mortar using broken bricks/brick bats 25 mm to 115 mm size with 50% of cement mortar 1:5 (1 cement : 5 coarse sand) admixed with water proofing compound conforming to IS : 2645 and approved by Engineer-in-charge over 20 mm thick layer of cement mortar of mix 1:5 (1 cement :5 coarse sand) admixed with water proofing compound conforming to IS : 2645 and approved by Engineer-in-charge to required slope and treating similarly the adjoining walls upto 300 mm height including rounding of junctions of walls and slabs. (c) After two days of proper curing applying a second coat of cement slurry using 2.75 kg/ sqm of cement admixed with water proofing compound conforming to IS : 2645 and approved by Engineer-in-charge. (d) Finishing the surface with 20 mm thick jointless cement mortar of mix 1:4 (1 cement :4 coarse sand) admixed with water proofing compound conforming to IS : 2645 and approved by Engineer-in-charge including laying glass fibre cloth of approved quality in top layer of plaster and finally finishing the surface with trowel with neat cement slurry and making pattern of 300x300 mm square 3 mm deep. (e) The whole terrace so finished shall be flooded with water for a minimum period of two weeks for curing and for final test. “All above operations to be done in order and as directed and specified by the Engineer-in-Charge”: 22.7.1 With average thickness of 120 mm and minimum thickness at khurra as 65 mm.

Providing GRP/FRP composite Mosquito proof hinged cover with frame with inside diameter of 600 mm for Overhead Water Tank (Having loading capacity not less than 300 Kg) of 'EVERLAST' or approved make as per CPWD/DAE make list having suitable locking arrangement for Manhole opening of water tank, fixing the cover by providing corrosion resistant studs, nuts, built-in hold fasts etc. by chasing or cutting holes and grouting with cement mortar 1:1 by adding approved water proofing compound @ 2% by weight of cement, all complete as per specification and as directed by EIC

Providing and laying autoclaved aerated cement blocks masonry with 115mm/ 150mm/ 230mm thick AAC blocks as per approved manufacturer, using approved block laying polymer modified adhesive mortar in super structure above plinth level at all locations, levels & lead with RCC band at sill level and lintel level all complete as per direction of Engineer in-Charge. (The payment of RCC band and reinforcement shall be made for separately) Notes: a) The contractor shall get approved the samples of autoclaved aerated cement blocks from the Engineer-In-Charge before procurement on large scale and shall maintain the same for the entire work. b) Necessary Openings/ nitches/ pipe sleeves/ cut-outs, wherever required as per drawings and asked for by the Engineer-In-Charge, shall be provided by the contractor without any extra cost. c) Masonry wall thickness shall be considered as 230mm/ 150mm/ 115mm thick and lesser wall thickness if any shall be made up to the required dimensions by the contractor in CM 1:4 using Ready Mix Mortar to proper line, level and plumb without any extra cost to the Department. d) The rate shall include cost of making autoclaved aerated cement blocks masonry to all geometrical shapes and sizes without any extra cost to the Department.

Cement plaster using READY MIX MORTAR (RMM) of approved manufacturer (Roofit Mix, Wallplast, Readiplast, Silcoplast) in single/ double coat as specified over masonry/Concrete surfaces in thickness as mentioned, in C.M 1:4 or richer by proportionally increasing cement content as required, over plane or curved surfaces at all level including rounding of surfaces wherever required, prepare the surfaces even and smooth in correct line, level, plane and plumb including scaffolding, chemical curing etc. complete as per specification drawings and as directed by the Engineer in charge.15 mm thick cement plaster using RMM 1:4 mix for internal masonry / concrete surfaces for all walls and beams flush with walls, mullions etc. Note: a) Before commencement of plastering, the area shall be cleaned, wetted and shall be marked with 'Thiyyas' or 'Tapanis' and shall be got approved by the Engineer-in-charge. b) Whenever the electrical contractor/ agency has to fix up switch boxes in walls, necessary Thiyyas or 'Dhadas' shall be arranged prior to plastering so that the electrical boxes are fixed properly in line with the finished plastered surfaces. c) Finishing around the junction boxes shall be done at all floor, level and position to the line, level and right angles as required while carrying out plastering work. d) No extra claim/cement consumption shall be entertained by the department for the plastering done more than the specified thickness shown in the schedule of quantities, to bring the plastered surface to perfect line, level and plumb with adjoining columns and beams. e) Only Ready mix Mortar of approved make shall be used. For richer proportion additional cement to be added in required proportion. f) 15mm thick internal plaster in single coat.

Sand faced cement plaster as mentioned below in CM 1:4, using factory manufactured pre mix/ ready mix of 'Roofit Mix' of M/s Premier Floor to Roof Materials pvt.ltd/ 'Build Well ready mix plaster' of M/s Walplast Products pvt.ltd/ 'Readiplast' of M/s Ultratech Cement Ltd / Readymade polymerised Dry mix Plaster - Silicoplast of M/s. Precise Conchem Pvt. Ltd.or other approved equivalent make, having minimum composition of Cement : Sand as 1:4 using fully treated dry, well graded natural sand conforming to IS 383 suitable for external plastering, having low rebound properties, low water demand for curing properties, mechanical mixing with water in a metallic tray only to make good consistency as per the specification of the Manufacturer and applied over exterior masonry and concrete surfaces final rendering, including using richer mix for making corners if necessary and making nosing / drip mould in plaster wherever required, at all floors, levels, all heights and locations including scaffolding, preparing the surfaces, finishing and rendering with sponge to correct line, level and plumb, curing/ chemical curing etc. complete as per specification and drawings and as directed by Engineer-in Charge- 20 mm thick in two coats for masonry/ concrete surfaces (external / internal) (back coat and finishing coat of 10 mm. thick each) with water proofing agent @ 2% by weight of cement or as per manufacturers specifications.