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. 482 In pipe sewer sufficient bedding of concrete should be placed and walls should be constructed of the standard thickness on the foundation upto the top of road level as per standard design of circular manholes. In ovoid sewer walls should be constructed upto the top of the arch and concrete beams should be provided above the ovoid sewer in a rectangular shape, so that the weight of masonry above does not fall on the arch of ovoid sewer, and walls should be constructed upto road level as per standard design of a rectangular manhole (including steps). After all, the plaster work is done and frame and covers are fixed above usual 0.30 M (1.’0”) thick concrete block. The top of the pipe or the ovoid sewer should be broken. This should be done by person standing top of the road level, by using long crow bars by heavy weight fixed at the bottom or by some other mechanical device. As getting inside the manhole and breaking with sledge hammer or chisel may cause sudden raise in level of water or poisonous gas may com out suddenly and may endanger the lift of the workman. After sufficiently big manhole is made in the arch of pipe, four manholes should be kept open in the stretch where manhole is to be constructed, two on upstream side and two on downstream side. The manhole covers should be kept open for an hour and tests are carried out viz. Davy’s safety lamp, lead acetate paper test and candle test. After the tests are successful another workman should get down in the newly constructed manhole preferably when the channel condition is seen on the manhole upstream or downstream side. He should apply coconut oil all over body and after tying rope around his waist and the other end held by another workman at the
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 483 top the work man should get down the manhole and chisel the pipe ends or ovoid arches ends so that the same is in flush with the wall of the manhole. Plaster in cement mortar 1:1 or if a big gap is there, concrete should be placed over exposed surface. (1 : 11/2:3 c.c.) The manhole should then be cleared of all debris etc. and should be thoroughly cleaned and handed over to CIDCO, if the manholes are constructed above main sewer, it should be shown to the Engineer, before handing over to the CIDCO. No utility service should be allowed to remain inside the manhole. Care should be taken to shift the same outside manhole. Steps should be provide on the side or place where there are no connections. After completing the work, the same should be handed over to CIDCO for maintenance. A copy of the memo acknowledging the taking over should be handed over to the respective superintending Engineer (Construction). 38.1 Drop Arrangement The rate of providing 150 mm, 230 mm dia vertical drop arrangement 0.60 M high in manholes with drop arrangement will include : 1. i) Providing 150 mm, 230 mm, 300 mm dia S.W. pipe of required length embedded in the masonry of the manholes at the upper and lower ends of the drop arrangement.
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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