For marine piling, working platform is either floating barge or
fixedjack up platform. Normally floating barge are kept in position
usingsuitable anchors and maintaining them according to tidal
variation oflocation or used spud barge. Jack up platform stands on
its leg restingon sea-bed, so tidal variation does not effect on
working.
Before starting any work and mobilization of piling equipment,
roughbathymetric survey to be done to estimate water depth as well
as sea-bed profile on that particular area. If accurate local
bathymetric data isalready available then this step may be
skipped.
Mobilization to be done considering factors like depth of water,
tidalvariations, nature of sea wave and current etc.
Approximate position of piling location is worked out using
marinesurvey system (Say DGPS system) using atleast 2 known points
onshore. After tracing position of piling location piling working
platform tobe shifted and set at that location.
Temporary guide casing then lowered and installed in to
sea-bed.Once guide casing is fixed, center of casing is checked and
maintainthe accuracy of piling.
Once this set-up is complete, it becomes ready for piling work.
Firstguide casing of suitable diameter is embedded into sea
bedsufficiently to ensure no drifting of bottom. Then drilling etc
completedas like on shore piling work.
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