particular specifications (road works) - CIDCO Maharashtra Ltd.

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.