Construction of R.C.C. Vaults at NSDF for storage of End Fittings, Garter Springs and pressure tubes (Unit#4) and associated works at RAPS plant site

Earthwork in excavation in all types of ground substrata consisting of hard rock / fragmented rock / soft rock / ordinary soils / filled up ground / murrum requring use of rock breaker, drilling, chiseling with mechanical / manual means etc. up to a depth of 1.5 m from the orginal ground level and dewatering if required for foundation of walls, columns, platforms etc. including backfilling with selected excavated materials in plinth and foundation trenches in layers not excedding 200 mm thick, watering ramming etc. complete and disposing off the surplus materials to a maximum radially measured lead of 1.0 KM. as per drawings, design, safety and specfication and directions of the Engineer. Note: Bidders should essentially visit and inpect the consturction sites and determine themselves the right and safest method/s of excavation considering the safety of nearby structures and population, before quoting their items rates (Blasting is not permitted).

Extra for every additional lead of 1Km or part thereof in all kinds of soil.

Extra for every additional lift of 1.5m & part there of in all kinds of soil.

Filling in foundations and plinth with sand with all cost of leads in layers of not more than 150mm thick each layer well rammed and consolidated including watering etc. complete.

Providing and laying 230 mm thick stone soling properly hand packed, filling interstices with spells and consolidating to required gradient and camber including spreading, watering and rolling binding materials earth etc. complete as per drawings, specifications and direction of Engineer (using quarry stone).

Providing and laying 150 mm thick stone soling under floors properly hand packed, filling interstices with spalls and binding material consolidating to required gradient and camber, spreading, watering etc. complete as per drawings, specifications and direction of Engineer.

Providing and laying cement concrete of 1:2:4 ( 1 Cement : 2 Coarse sand : 4 graded stone aggregate 20 mm nominal size) in retaining walls, return walls, walls(any thickness) including attached pilasters, columns, piers, abutments, pillars, posts, struts, buttresses, string or lacing courses, parapets, coping, bed block, anchor block, window sills, fillets etc. at all level including transporting of concrete to site, laying including cost of finishing, curing etc. all complete excluding the cost of centering and shuttering as per specifications and direction of Engineer-in-charge.

Providing and laying in position machine batched, machine mixed and machine vibrated design mix cement concrete of all grades for Reinforced cement concrete work using 20mm size graded stone aggregates including transporting of concrete to site for laying but excluding the cost of centering, shuttering, reinforcement and EPs but including cost of finishing, compaction, curing, approved chemical admixtures conforming to IS 9103 in recommended proportions for achieving slump not more than 120mm and water/cement ratio not more than 0.45 at all level as per direction of Engineer-in-charge. Use of concrete retarding agent / accelerator conforming to IS 9103 shall be done as per requirement based on mix design. Rates should be based on using 350 kg of cement per cum of concrete.

Supplying and casting RCC of Grade H-30/20 of minimum density 3.75 Gm per Cu Cm. using graded heavy aggregate of size 20 mm hematite from approved source including form work, scaffolding, mixing, adding admixure as per design mix, transporting, placing at all lifts, vibrating, consolidating, curing and finishing smooth all exposed faces for all in situ itmes as per drawings and specifications. (The rate quoted shall be exclusive of reinforcement and inclusive of formwork) NOTE : (i) Consumption of cement considered as 340 kgs / cum minimum. (ii) Any upward variation in cement consumption to achive H - 30 Grade shall be measured and paid under item no:8 below.. (iii) Design mix preparation shall be obtained from reputed approved concrete testing laboratory. (iv) Addition of admixture to accelerate, retard setting of concrete / to improve workability without impairing strength and durability of concrete as per direction of Engineer in charge and as per IS : 9103. (v) Fly Ash shall be used for additional leak tightness as per design mix. (vi) Bidder shall consider cost of preparing and dismantaling casting plateform for Heavy concrete Pre-cast hatch covers while calculating the rate.

Add extra for using more cement than specified in item of PCC or RCC