BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

The concrete for the pile cores shall comply with the concrete specification.Concrete may need to be made from sulphate resisting cement where necessary.Concreting of the core shall not commence until the Board has inspected.The concrete shall be transported and placed in such a way that it ishomogeneous with a high density, and care shall be taken to avoid segregation.The method of placing and compacting the concrete shall be to the completesatisfaction of the Board. Care shall be taken that harmful materials do not fallinto the pile hole during concreting.Curing of pile-heads expose to the atmosphere below cut-off level shall complywith the concrete Specification where practicable.The concrete shall be finished 40 mm above cut-off level. Concrete shall notnormally be placed in or through water. In particular circumstances only, theBoard may allow the Contractor at his own expense to place concrete (usingsuitable mix) through water by means of a termite pipe. If the Contractor's pilingsystem does not normally exclude water during concreting, he should allow in histender for the use -of compressed air or other method to keep the pile hole free'from water whilst the concrete is being placed.(5) Steel PilesThe Contractor shall take all necessary precautions to prevent damage to steelpiles and fittings when handling, pitching and driving piles. Adequate bearers shallbe provided under stacks of piles at positions to prevent distortion of the piles.Any piles which are permanently deformed will be rejected.Details and jointing lengths- of piles will only be permitted with the Board'sapproval. The type of joint and weld details shall be in accordance with the pilemanufactures recommendations.Where the completed pile will be subjected to long term corrosion adequatemeasures shall be taken to protect the surface of the exposed pile by casing inconcrete or such other means satisfactory to the Board.(6) Miscellaneous Piling Systems and Subsoil Improvement MethodThe Contractor can propose any system of piling or subsoil improvement methodnot covered by the foregoing specification and shall submit his proposal thereonto the Board for approval in sufficient time to allow the suitability of the system inthe ground conditions prevailing on this Site to be investigated fully.(7) TestingThe Contractor shall install at least two piles solely for testing purposes and shallsubmit a detailed driving record and other data as directed by the Board for thepurpose of proving the proposed pile design. If this pile test does not satisfy thespecified settlement, further piles shall be installed and tested.The Contractor shall provide all the equipment required for carrying out load testsGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)165