PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

maintained. In addition to the normal lighting arrangements, the Contractor shall
provide, whenever such work is in progress, battery operated blinking lights
(6 volts) in the beginning and end of a trench with a view to provide suitable
indication to the vehicular traffic. The Contractor shall also provide and display
special boards printed with fluorescent prints indicating the progress of work along
the road. In the event of the Contractor not complying with the provisions of the
clause, it may be carried out by the Engineer and the cost recovered from the
Contractor besides claiming liquidity damages from the contractor. In all such
cases the work may be carried out by Board. The Contractor shall be held
responsible for all claims for compensation as a result of accident or injury to
persons/non-provision of red flags.
The Contractor shall at his own cost provide all notice boards before opening of
roads as directed by the Engineer.
Arrangements shall be made by the Contractor to obtain permission from traffic
authorities for working and to direct traffic when work is in progress. No separate
payment shall be paid for this item of work.
5.19 Refilling trenches.
a) With a view to restrict the length of open trenches, on completion of the pipe laying
operations, refilling of trenches shall be started immediately by the Contractor.
Pipe laying and testing shall follow closely upon the progress of trench excavation
and the Contractor shall not be permitted more than 500 metres of trench
excavation to remain open while awaiting testing of the pipe line.
b) Care shall be taken while back filling, not to injure or disturb the pipe. Filling shall
be carried out simultaneously on both the sides of the pipes so that unequal pressure
does not occur.
c) Walking or working on the completed pipelines shall not be permitted unless the
trench has been filled to a height of at least 30cm over the top of the pipe except as
may be necessary for tamping etc., during back filling work.
d) Filling-in shall be done in layers not exceeding 150mm in thickness accompanied
by adequate watering, ramming etc. so as to get good compaction upto 300mm
above the top of the pipe. Above this level, river sand shall be placed in layers of
200mm watered and compacted by tamping.
e) The trench shall be refilled so as to build up to the original ground level, keeping
due allowance for subsequent settlement likely to take place.
GTS : General Technical Specification. Page 40