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. 556 1.14.3 Lapping: i) As far as possible bars of the maximum length available shall be used. Laps shown on drawings or otherwise specified by the Engineer will be based on the use by the contractor of bars of maximum length. In case the contractor wished to use shorter bars, laps shall be provided at the contractors cost in the manner and at the location approved by Engineer. ii) As and when necessary welded laps shall be provided as specified by the Engineer. 1.14.4 Spacing, supporting and Cleaning: i) All reinforcement shall be placed and maintained in the position shown on the drawing. ii) The contractor shall provided approved type supports as specified on the drawings for maintenance the top bars of the slab in position during concreting. All cover blocks shall be concrete (not and cement mortar) and of the same strength as that of the surrounding concrete and properly compacted. iii) 17 SWG GI wire shall be used as binding wire. All bars crossing one another shall be bound with this wire twisted tight to make the skeleton or network rigid so that the reinforcement is not displaced during placing of concrete. iv) Bars must be cleaned before concreting commences of all scales, rust or partially set concrete which may have been deposited during placing of concrete in previous lift of concrete.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 557 The bars shall be cleaned with dry gunny bags if they are coated lightly with rust or other impurities. On no account shall the bars be oiled or painted nor shall mould oil used on the framework be allowed to come in contact with the bars. Cement wash to bars shall not be permitted. 1.14.5 Welding: i) Whenever specified all welding shall be carried in accordance with IS: 2751. Only qualified welders shall be permitted to carry out such welding. ii) For cold twisted reinforcement, welding operation must be 1.14.6 Measurement: controlled to prevent supply of large amount of heat greater than that can be dissipated. The extreme non twisted end portion shall be cut off before welding. Electrodes with rutile coating should be used. i) The weight of steel to be paid for at the contract rates shall be the weight of bars as mentioned on the drawing or as instructed by the Engineer including stirrups, ties, spacer bars, chairs and any other steel works specified as reinforcements but excluding welding and cover blocks. Laps as specified on the drawing shall be paid for. Laps required because of the contractor’s use of shorter bars will not be paid for. ii) The weight of any stirrups and tie bar shall be computed from the dimension given on the drawings or bending schedules. The weight in Kg/metre shall be taken as 0.785 kg/metre per 100 mm 2 of cross section. No allowance in the weight paid for shall be made for the rolling margin.
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