BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

on piles together with the apparatus for measuring shall be to the satisfaction ofthe Board.Measurement of pile movement during testing shall be by a means capable ofreading to 0.1 mm. This shall be related to a benchmark situated at a sufficientdistance from the pile to ensure a permanent datum.The loading system shall incorporate a proving ring, load cell or other apparatuscapable of measuring the load to an accuracy with 2%.(8) Test Pile LoadThe test pile load shall be twice the specified working load and shall be applied insteps not exceeding 10 tons. Displacement readings shall be taken every 5minutes after application of the load increment until two consecutive readingsshow that the displacement has ceased. When the test load reaches the specifiedworking load, the displacement readings shall continue until it is established thatno further displacement has occurred over a 15 minute period.The working load shall be then maintained for a further 24 hours, displacementreadings taken every 2 hours.When no further displacement is apparent on completion of the 24 hour period orwhen approved by the Board, the load shall be removed in one stage and therecovery readings taken every 15 minutes until recovery has ceased.The pile shall then be reloaded in one stage to the specified working load,readings being taken every 15 minutes until displacement has again ceased.The load shall be then increased in equal increments up to twice the specifiedworking load, the same procedure being followed as stipulated for the beginningof the test. The maximum load shall be maintained for 24 hours or as directed bythe Board after all displacement has, ceased, and readings shall be taken every 2hours during this period.On completion of this period or when approved by the Board, all loads shall beremoved and the displacement on recovery noted.(9) Settlement Under Test LoadsThe settlement of the pile head under test load shall not exceed -the followingfigures under the loads stated :Under 120% working load, settlement of 8mm.Under 200% working load, settlement of 25mm.After removal of test load immediate residual settlement of 3m m for 120%working load and 15mm for 200% working load.On completion of each pile test the Contractor shall supply the Board with twocopies of a complete report which shall include graphs of load-settlement, load-Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)166