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. 468
distance therefrom to be well clear of all intended excavation, so
arranged that a sight-rail when fixed level against the post will cross
the centre of the manhole. The posts must also be so set up that the
longitudinal direction of the rail may be as clear as possible of the
direction of any of the lines of pipes or drains converging to the
manhole. If walls of buildings afford suitable means of fixing the
sight-rail, the post may, however the dispensed with. The sight rails
must not in any case be more than 30 M. apart intermediate rails
therefore be put up if necessary.
23.2 Construction of boning staves
23.3 Site rails
Boning staves shall be prepared by the contractors about 75 mm by
50 mm of various lengths, each length being of a certain number of
Metre and with a fixed tee-head ad a fixed intermediate cross piece,
each about 300 mm long. The top edge of the cross piece must be
fixed at distance below the top edge of this tee-head, equal to as the
case may be, the out side diametre of the pipe or thickness of the
concrete bed to be laid. The boning staff, must be marked on both
sides to indicate its full length. According to the circumstances of
each case, a suitable length of boning staff will be determined upon,
and the reduced level of the bed of the pipe or bottom of concrete of
drain at each sight-rail added to the selected length of boning staff,
will be marked by a horizontal line on both posts, or on walls or
fences to which the sight-rail is to be fixed.
a) The sight-rails (about 25 cm wide and 40 mm thick) is to be screwed
with the top edge against the level marks. The centre line of the
pipe sewer or the drain will be marked on the rail and this mark will