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. 450 3.6 Widths of excavation for different diametre of pipes a) The width of excavation for a built up drain or sewer unless otherwise stated will be calculated to 250 mm on either side of the extreme edge of the footings and the depth upto the bottom of foundation. In case of pipes of different diametres and manholes the width of the trenches will, unless otherwise directed by the Engineer in writing, be paid for as mentioned in the table below. This width shall include the extra width required for shoring in one or more stages and working space required for construction brick masonry or plastering the same for laying and jointing of the pipes or any other purpose in connection with the excavation of the work. b) Where rock is met with unless otherwise determined by the Engineer, the width of the trench below the point at which the rock is met, shall be calculated as shown in the accompanying table, irrespective of the depth of the trench. In case of built up drains this shall be calculated to 75 mm on either side of the extreme edge of the footings. c) Statement showing widths to be given for excavation for either 1.20 M. or 1.50 M. (Inside) Circular or 1.50 M. x 1.50 M. square manholes in sewerage works. Depth of Manhole Upto invert level 1) For 1.20 M. dia. M.H. upto 2.30 M. Size of excavation Remarks 2.50 M. Square Without drop arrangement For 1.50 M. dia. M.H. 3.0 M. Square -- do -- For 2.30 M. to 5.00 M. 3.5 M. x 3.00 M. With drop arrangement on both sides.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 451 Depth of Manhole Upto invert level Size of excavation A. Without drop arrangement Remarks Above 5.00 M. I - In ordinary soil 3.4 M. Square 1st stage upto 5.00 M. 3.0 M. Square 2nd stage below 5.0 M. II - In trenches where rock is met with 3.4 M. Square Upto the point where rock is met with 3.0 M. Square Below the point where rock is met with B. With drop arrangement on both sides I - In ordinary soil Across Along 3.8 M. x 3.4 M. 1st stage upto 5.00 M. 3.5 M. x 3.0 M. 2nd stage below 5.0 M. II - In trenches where rock is met 3.8 M. x 3.4 M. Upto the point where rock is met with 3.5 M. x 3.0 M. Below the point where rock is met with d) Statement showing widths to be given for excavation for 1.8 M. dia. circular manholes and 1.50 M. scraper type manholes. A - Without drop arrangement : I - In ordinary soil 3.70 M. square 1 st stage upto 5.0 M. 3.40 M. square 2 nd stage below 5.0 M. II - In trenches where rock is met with : 3.70 M sq. upto the point where the rock is met with 3.40 M sq. below the point where the rock is met with B - With drop arrangement on both sides : I - In ordinary soil : Across and along : 4.10 M x 3.70 M 1 st stage upto 5.0 M 3.80 M x 3.4 M 2 nd stage below 5.0 M
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