Construction of foundation is most important in a structure,
so all the correct and safe actions should be taken while doing a foundation.
Cofferdam is commonly used for oil rig construction and repair, bridge and dam
work, the cofferdam is usually a welded steel structure that is temporary and
is typically dismantled after work is completed.
Cofferdams is used to provide a safe
working space at foundation level
It’s difficult to handle deep foundations
under water or ground in deep
Safety in construction of cofferdams
Construction of cofferdam presents safety problems
unique to this type of construction.
They will be limited access, limited work
areas, damp or wet footing, and deep excavations.
Provisions must be made for safe access in
terms of adequate walkways, rails, ladders, or stairs into and out the lower
levels.
The work may be within a waterway, in which
case additional safety regulations may apply. These would include provisions
for flotation devices, boats, warning singles, and suitable means for a rapid
exit.
Inspection and Maintenance
Dams should be inspected regularly and
immediately repaired if required. A
through inspection should be conducted following flood events.
Water removed from work area may be silty
and should be discharged to a
vegetated area at least 30 m from the
watercourse, or pumped through a filter bag
The weather forecast should be monitored to
anticipate the occurrence of high flow
events.
Work operations should be adjusted to accumulate possible overtopping of
the coffer dams
Consideration
of Selection of a cofferdam
Soil
conditions
Location
of the coffer dam (land/water)
Plan
size of working area
Maximum
depth of soil or water to be retained.
Nature
of the permanent or floating structure
Effects
on excising adjacent structures
Ground
water level & their fluctuation
Construction
time
Availability
of equipment and material
Possible
construction method & dismantling
Effects
of noise, vibration and fumes, & fire risk.
It
water cofferdam behavior of water.
Cofferdams
is mainly of two types
Gravity
coffer dam :-
Sheeting
cofferdam
Cofferdams promote safety, yes. That’s the very reason why most of the construction engineers and owners of a specific building choose to use cofferdams. It is to enhance the construction progress and everyone’s safety as well.
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