Name of Work:Construction of underground sump at the Jawahar Navoday School premisesDunetha, Nani Daman. (6thCall) (E-11681)
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Repairing structural design of RCC Underground / Partially underground / above high ground level reservoir of required capacity as per relevant I.S.s and constructing the same, including excavation in all types of soil strata (including rock) including shoring strutting if required, for loose soil/ to protect from collapse due to nearby traffic load, casting 100 mm thick P.C.C. levelling course in M-10, Refilling the pit with proper soil and disposing of the surplus stuff within a lead of 50 meters including cement plaster in CM 1:2 with approved water proofing compound to inside water touching surface to container, including all types of labour and material charges of lowering, laying, erecting / hosting and jointing of pipe assembly to inlet, outlet overflow, washout and bye pass arrangement as per hydraulic design. Providing and fixing accessories like MS/GI Ladder, CI Manhole frame and cover, water level indicator, adequate cowl type ventilators or lantern type ventilator with stainless steel jali. B.B Masonry chambers for valves, Providing and applying three coats of cement paint/snowcem to the outside face of structure, It also includes satisfactory water tightness test as per relevant I.S code and painting name of scheme and capacity on the take as per direction of engineer-in-charge. List of Indian Standards for Design of GSR / Sump :- (1) I.S 3370 part I & II 2009 or latest revised (2) I.S456 - 2000 or latest revised.(3) I.S 1893 - 2000 - 1984 or latest revised. (4) I.S 1875 Part - 1 to 3, 1987 or latest revised. General Specification. (1) Water depth in container shall be adopted as per data of tender. If water depth is not specified the suitable water depth / acceptable to field engineer in accordance with hydraulic requirement shall be adopted for capacity. (2) Shape of container (in plan) specified by in data shall be adopted in absence circular shape shall be adopted. (3) Size shall be fixed as per availability of space (land area) at site/acceptable engineer in charge. (4) Effect of overlapping of pressure bulbs on soil due nearby structure and proposed sump should be considered. (5) Care shall be taken that no damage should occur to nearby existing structure, compensation shall be paid for the same by agency. (6) The minimum concrete grade for RCC shall be M-30. (7) HYSD Fe 500D grade reinforcing with epoxy coating bars confirming to IS 1786/1139 shall be considered in design. CRS/ TMT bars shall be provided, in saline atmosphere crossing resistance stainless steel / HCR rebar shall be provided. Any other steel can be used with approval of C.E/in situation of non-availability in market without extra cost. (8) Minimum size (or thickness) of various components shall be provided as per tender criteria/specifications in absence as per I.S/ Std. practice of G.W.S.SB Minimum dimension specified for various components in tender data / specification shall be provided without fail. (9) The safe bearing capacity (SBC) shall be referred from SBC test report, in absence of report it shall be referred from data sheet. If poor soil is found / water table is met with during excavation SBC shall be scientifically ascertained and design shall be revise, No extra shall be paid for increase in quantity. (10) DI pipes and special shall only be used if type is not specified in tender. (11) The rate shall include coat of dewatering during excavation making all arrangement when water table meets within depth. (12) The structure shall be designed properly to resist uplift due to ground water table specified in data or actual ground water table meets with during excavation. If GWT / Uplift is mentioned in tender and during excavation it does not meet 7.5% rate shall be reduced. (13) SS pipes railing shall be provided when sump is more than 1.5 meter above ground level. (14.a) RCC staircase/RCC stepsshould be provided from G.L to sump top slab based on the height of the GSR above /below the ground. (14) RCC stair case with SS railing to be provided inside reservoir container BB Masonry stair cabin with MS safety door having locking arrangement to be provided for GSR, Sump and HGLR of capacity morethan 7.5 lakhs liter with top slab ifis constructed as top slab then provide minimum opening of 900 mm x 2000 mm with curbing abd ss railing around. (15) Apperarance of structure should be aesthetically good looking acceptable to authority. (17) Any charge in data, dimension, shape, water depth, reduction in size if permitted by competent authority and if it reduces quantity then payment shall be reduced prorate.(18) When capacity of GSR / Sump is > 20 lakh litters two or suitable compartments acceptable to executive engineer shall be designed and provided. (19) Agency shall engage qualified (at least graduate) consulting engineer for designed the structure and he/she shall visit the site for guidance of work. (20) 75 % part rate shall be payable for concrete, reinforcement and plastering items of container until satisfactory hydraulic testing for water tightness is performed as per tender condition till the work shall be treated as incomplete. Above conditions /general specifications sr. No. 1 to 20 are part and parcel of tender (contact) and prevail over other provisions in tender. As above rectangular sump without watertable (Sub Soil water level below foundation) Cost of 100000 liter.
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