particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 506 50. FORM WORK a) Material All form work for concrete works shall be made either of planed and matched timber or M.S. plates. The timber for the form work shall be hard wood dry and well seasoned. It shall not be so dry as to absorb water from concrete nor shall it be so green as to shrink after erection. When steel plates are used for forms, the plates shall be free from wrinkles, dents, lumps or other imperfections. The timber boards or steel plates shall have sufficient thickness to withstand the construction loads and the pressure exerted by the wet concrete as well as vibration during placing of concrete. Normally the thickness shall not be less than 38mm for timber and 18 gauge 18 M.S. Plates. However, in case where depth of concrete to be poured in the formwork is small, the thickness of timber planks may be reduced in consultation with the Engineer. b) All forms shall conform to the shape, lines, dimensions as shown on the plans of the concrete members. The form works shall include all wedging, bracing, tierod, clamps, stop of boards and other devices necessary to mould the concrete to the desired shape. The formwork shall be so constructed as to remain sufficiently rigid during the placing and compacting of the concrete and shall with-stand the necessary pressure, ramming and vibration without any deflection from the prescribed lines and curves. It shall be properly strutted tight to prevent loss of liquid slurry from the concrete. It shall be strongly and firmly erected. The mould shall be planed smooth, free from knots, holes, open joints and other imperfection. The use of bolts passing through
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 507 concrete members which form parts of any water retaining structure shall not be permitted for the purpose of securing and aligning the form work. The form work shall be so arranged as to permit easy erection initially and later easy removal without jarring or disturbing the concrete wedges and clamps shall be used wherever practicable instead of nails. Where the depth of form work exceeds 1.5 metres, the contractors shall keep one side partly open, from which the concrete could be placed and the planking on the open side could be raised as the work proceeds. This will avoid segregation of material in concrete and also facilitate its proper vibration. Before concrete is placed, all rubbish shall be removed from the interior of the forms and surface of the forms work in contact with the concrete shall be cleaned and thoroughly wetted. The inside surface of the form work shall be treated with a coat of line, oil or any other material approved by the Engineer. Care shall be taken to see that the above approved composition is kept out of contact with the reinforcement. The slab centering shall be covered with double war water proofing paper or tar paper or polythene sheet as directed by the Engineer. c) Waterproof Paper Waterproof building paper shall comply with B.S. 1521, 1949 for road works, it shall be of class ‘B’. Where no special finish is desired such as slabs, columns in the reservoir etc. and where form finish is acceptable, the form work may be prepared out of ‘Anchor’ brand plywood for similar
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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