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. 526
1.9 Refilling :
On completion of the pipe laying operation any section for a length
of about 10 mtrs., and while further work is still in progress, refilling
of trenches shall be started by the contractor with a view to throw
open the traffic the portion of the roadway in which the work is
already over. Only soft earth and murum of good quality obtained
form the excavation and stacked near the work site shall be used for
filling in around the pipes (at least 30 cms. Around) and its-
anchorages. The remaining portion of the trench shall be filled in
with a mixture of hard and soft materials in sufficient quantities if
good earth and murum are not available. Filling shall be done in
layer not exceeding 20 cm. in thickness with adequate watering,
ramming and rolling so as to obtain good compaction. Excavated
materials laying within a distance of 50 mtrs., shall be used for this
purpose. The trenches shall be refilled so as to build up to the
existing ground level. Such refilling work including a lead of 50
mtrs., shall be paid for separately under relevant item in schedule
“A”. The Engineer shall at all times have powers to decide which
portion of the excavated materials shall be used for refilling and
which place of site and in what manner it shall be used.
2.0 Murum Bedding :
In case of hard rock, marine clay and black cotton soil, sand
bedding to a maximum depth of 300 mm shall be provided by the
contractor. The murum bedding shall be done for the full width of
the trench in the portion where such bedding under the pipeline is
necessary. It shall be properly watered and rammed. The murum to
be used shall be as far as possible out of excavated materials only.