N.O.W.-Cleaning of overhead RCC Tank and Erection of MS staircase etc. of 465 MS HIG DUs in Sector-18 B, Phase-II, Pkt-1, Under30 year maintenance in DDA Housing Scheme-2010.

Cleaning of under ground sump, Over Head R.C.C. Tank ( independent staging) including disposal of slit and rubbish, all as per direction of Engineer-in-Charge. The cleaning shall consist following operations: (i)Tank shall be emptied of water by pumping & bottom shall be cleaned of silt and other deposits. (ii) Entire surface area of the sump shall then scrubbed thoroughly with wire brush etc. and pressure washed with water. (iii) Chlorination of RCC internal surface by liquid chlorine. (iv) The treated surface shall be dried using air jetting and all loose particles shall be removal from the surface. (v)Finally the surface shall be treated with ultraviolet radiation etc. as per direction of Engineer-in-Charge.

Steel work in built up tubular (round, square or rectangular hollow tubes etc.) trusses etc., including cutting, hoisting, fixing in position and applying a priming coat of approved steel primer, including welding and bolted with special shaped washers etc. complete. (a) Hot finished welded type tubes

Steel work welded in built up sections/ framed work, including cutting, hoisting, fixing in position and applying a priming coat of approved steel primer using structural steel etc. as required. (a)In stringers, treads, landings etc. of stair cases, including use of chequered plate wherever required, all complete

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.25 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.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. SBR Polymer (@10% of cement weight) modified cementitious bond coat @ 2.2 kg cement per sqm of surface area mixed with specified proportion of approved polymer

Providing, mixing and applying SBR polymer (of approved make) modified Cement mortar in proportion of 1:4 (1 cement: 4 graded coarse sand with polymer minimum 2% by wt. of cement used) as per specifications and directions of Engineer-in-charge. Note: Measurement and payment: The pre-measurement of thickness shall be done just after the surface preparation is completed and Payment under this item shall be made only after proper wet curing has been done and surface has been satisfactorily evaluated by sounding / tapping with a blunt metal instrument and/or the 75 mm size cube crushing strength at the end of 28 days to be not less than 30 N/Sqmm2). 12mm average thickness

Finishing walls with water proofing cement paint of required shade a) Old work (one or more coats @ 2.20 kg/10 sqm) complete.

Painting with synthetic enamel paint of approved brand and manufacture of required colour to give an even shade :One or more coats on old work

Providing and Fixing Water Levelling Indicator/Water Alarm in Overhead Tanks on Terrace

Modified Estimated Cost for item no. 1 to 10 after using Correction factor on DSR 2023 on account of GST@ 0.973 i.e. Rs. 1918432 (total estimated cost is to be reduced by 2.7% accordingly)

less Cost Index @0.09% on all DSR items (except item no. 10)

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