
WJ are once again showing our technical prowess with another challenging project in
Anchorsholme; dewatering a
cofferdam in the
Irish Sea! WJ have been working in and around
Blackpool for several years now, having completed the
Anchorsholme Park Storage Phase 1 and Phase 2 works for
Ward and Burke and the
Lennox Gate project for Ward and Burke and
JN Bentley, both during 2016 and 2017. Our latest project, working with the
CH2M HILL –
VolkerStevin joint venture,
C2V+, was to aid the construction of a new 6m by 20m
cofferdam in the
Irish Sea, directly off the coast from the
Anchorsholme Park Storage site. The particularly challenging aspect of this project was the offshore location of the cofferdam, fortunately WJ have undertaken several similar projects to this in recent years in
Ipswich and
Dover. The
dewatering system comprised eight 9.5m deep deepwells installed around the internal perimeter of the cofferdam, installed using a
rotary drilling rig, in to interbedded
sand and
clay deposits during
February 2018.

The first
technical challenge on this project was the installation of the wells themselves. It was only possible to install during the two 6-hr
low tide windows each day, as during
high tides the cofferdam would be flooded. During each of these windows it was necessary to pump out the cofferdam, crane the drilling rig in to position, drill, seal off the works so they wouldn’t flood when the tide came back in, and remove the rig from the cofferdam. Fortunately due to the meticulous
planning of the works by the
WJ Project Engineer, Michael Cummiskey, the wells were all successfully installed during the planned installation period.

The second technical challenge was also a result of the offshore location. As the cofferdam would be flooded during high tides it was necessary for the WJ control cabin and generators to be located onshore on an existing revetment, above the maximum tide level, with cables running between the cofferdam and the cabins along the beach and existing sea defences. Despite the best efforts of the Irish Sea the target drawdown was successfully achieved and the pumping is due to continue until the end of April.
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