BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

exceeds the tolerance limits specified herein may be required by the Board to beremedied or removed and replaced by the Contractor.Construction Tolerances for Concretea. -Variation from vertical:In the lines & surfaces of In 3 m 5 mmcolumns, walls and towers In 6 m 10 mmIn 12m or more 20 mmFor exposed columns, In 6 m max, 10 mmjoint grooves and other In 12 m or more 15 mmConspicuous linesb. Variation from the level or In 3 m 5 mmfrom the grades indicated On In any bay or 15 mmthe approved drawings:6 m max.- In floors, inverts, In 12m or more 20 mmc. Variation of the linear In any bay or 20 mmstructure lines from estabt- 6 m max.lished position in plan andrelated position of wallsIn 12m or more 30mmd. Variation in locations of 10 mmsleeves and sizes and locationsof floor openings andwall openingse. Variation in cross-section @1 minus 10 mmdimensions or columns, beams Plus 15 mmand in the thickness of slabsand wallsf. Variation in steps:In a flight of stairs Rise 3 mmIn consecutive steps Tread 5 mmRise 2 mmTread 3 mmg. Variation in other structure 30 mmConstruction Tolerance forPlacing Reinforcing Steela. Variation of protective 50 mm cover or less 10mmcovering more than 50 mm cover 15mmVariation from indicatedspacing (any one bar)25mm(3) Repair of concreteGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)173