EXCAVATION
The work involves the excavation of
the trench to the required level,
compacting the sub-graded and preparing
sand bedding for the foundation.
Procedure of Works :--
- Care
shall be taken during mechanized excavation using excavator and JCB’s
especially in the first 6M depth where most of the services are located.
- Upon
identifying warning tape of any service, mechanical excavation shall be
stopped and manual excavation shall be done.
- In
areas where the trench is close to the buildings, depending on the type of
foundation of the building, shoring shall be done by planking, shuttering
or trench sheets.
- In
other areas it will be stopped open excavation with battened slopes.
- Dewatering
system shall continue to run until backfilling is completed up to the
level of natural water table.
- Bottom of the trench shall be cleaned, free of loose material; rock
projections and the surface will be leveled and moistened uniformly before
commencing compaction.
- Leveled Bottom shall be compacted
as per specifications.
- Where necessary, temporary pedestrian bridges over trenches and
vehicle access bridges shall be erected to provide access to labour.
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