| 2 | Construction of OHT:
Design, Submission of vetted design and drawing from IIT, Supply of all materials, site clearance labour, T&P etc. required for construction of INTZ type RCC Overhead Tank with minimum freeboard of 15 cm including Ventilator and Water Level Indicator, Lightning Conductor, C.I. D/F Vertical Pipes (Inlet Pipe-1 No., Outlet Pipe-2 No., Overflow Pipe-1 No. & Washout Pipe-1 No.), Duck Foot Bend, Puddle Collars and Bell Mouths, DI/D/F Sluice Valves with actuartors on Inlet, Outlet & Washout Pipes and Sluice Valve Chambers, Bypass Arrangement of OHT, Flooring with Apron & Drain (minimum 100 mm thick PCC of 1:2:4 & 100 mm thick RCC of 1:1.5:3 with nominal reinforcement), the construction of a 30x30 cm cement concrete (CC) drain with an internal wall thickness of 100 mm, over a 60 cm wide plain cement concrete (PCC) base of 100 mm thickness in 1:2:4 mix, for rain water disposal of campus, shall be carried out for a minimum length of 200 meters along the boundary wall of the campus up to the disposal point, Floor Level shall be 70 cm above the Finished Ground Level of whole Campus (The finished Ground level of campus shall be kept 30 cm above the nearest approach road) including supply of earth to fill the whole campus according to the formation level(floor) of OHT, Three Coats of Apex Painting(Painting through spray is prohibited) over One Coat Primer of Approved Colour after Finishing of RCC Surface with Grinder, Repair of Pinholes, Unevenness (contractor to ensure smooth surface free from any marks and roughness), supply and fixing of four number 60 Watt solar light system (with dry battery) at the height of second brace of the OHT near stair case and main gate, Railings G.I. Pipe Railing around Staircase (both sides), Balcony & Top Dome Periphery, S.S. Ladder from Opening of Top Dome to Bottom Dome, Staircase (Separate Two-Column Based RCC Staircase including Escape Channel of 20 m Length, Box-Type Enclosure at the Entrance of the Staircase having Locking Arrangements, and 1.20 m Wide Balcony), Food Grade Epoxy Coating on Inside Surface Area of Water Container after Successful Testing for Water Tightness as specified as per Tender Document for Following Capacity and Staging mentioned as per BOQ. Item also include earthwork, brickwork, pumping out of water/mud/sewage, 1 no. toilet (with Saptik tank and proper flushing system) required activity necessary for construction of OHT and its appurtenant structures. Cost Included in Item 1.03 & 1.04 | | |
| 3 | For bidding purposes, the bearing capacity of soil shall be considered as 7.0 t/sq.m. Working design shall be based on the SBC determined (The depth of bore hole shall be two times of proposed dia meter raft foundation of OHT) after soil investigation / 7.0 tonne/sq.m. The depth of foundation is minimum 3.0 m from existing ground level on raft foundation or pile-cum-raft foundation or at more depth based on the design of the tank, for which no extra claim shall be entertained. The height of columns shall be desided by considering the natural ground level and formation level of floor of OHT. The staging shall be accounted between floor level to bottom ring beam.
Note: The bid price of Overhead Tanks is to be submitted considering net safe allowable bearing capacity as 7.0 t/m , keeping the minimum foundation depth to be 3 m below the existing ground level at the site of work. The successful bidder will be required to investigate the soil bearing capacity. If net safe allowable bearing capacity is found to be equivalent to or more than 7.0 t/m , the design of OHT will be based on 7.0 t/m capacity. However, in case the net safe allowable bearing capacity is found to be below 7.0 t/m , then the design of OHT will be based on the actual bearing capacity, adopting raft foundation or raft-cum-pile foundation.
Cost Included in Item 1.03 & 1.04
| | |
