Darda ROCK SPLITTERS
Main Darda Rock Splitters
Application Reports Index
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| Application Report - Demolition of Rock and Natural
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Underwater demolition
- demolition on the bed of the East River
The Job:
A new power line had to be laid under water, on
the bed of the East River in Manhattan, NY. The cable itself would
be laid in a trench. During the trenchdigging operations, the workers
hit a stratum of hard slate, over 200 m in length, at a depth of 10m
under water.
The requirements:
This posed a problem in that the site was located
near the Long Island railway tunnel, making it impossible for explosives
to be used.
The solution:
Two divers, using suitable pneumatic hammer drills,
drilled the necessary holes in the bed of the river after which the
slate was split with two hydraulic splitting cylinders. The hydraulic
equipment, mounted on a barge, was connected to the cylinders with
long hydraulic hoselines. The splitter destroyed the structure of
the slate, after which it was reduced with a hydraulic breaker and
extracted by a dredger.
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