Articles & Case Studies

SYKES PUMPS PROVIDES GATEWAY TO RAPID MERSEY EXCAVATIONS

Posted: Monday 20th July 2015

Pump hire specialist, Sykes Pumps, has provided the pumps required to enable piling works for the construction of the Mersey Gateway Bridge, a new six lane toll road over the River Mersey between Runcorn & Widnes.

Constructed by Merseylink Civil Contractors Joint Venture (Merseylink CCJV), a joint venture between Kier Infrastructure and Overseas Limited, Samsung C&T ECUK Limited and FCC Construcción SA, the Mersey Gateway Bridge will be located just 1.5km to the east of the existing Silver Jubilee Bridge.

The bridge’s 2.3km length includes a 1km span crossing the river, which will be supported by three towers, anchored by foundations cast beneath the river bed. A steel coffer dam was erected in order to drain the area of the river bed where the foundations for the first tower were constructed, enabling the construction team to excavate down to the river bed safely, ready for piling and concrete pour.

Specialist contractor, Jet Pumps UK Ltd suspended two 8” electric submersible pumps from Sykes Pumps from a temporary access bridge between the shoreline and the dam, using them to extract river water. This water was then fed into a high pressure water pump to supply Motive water to the jet Pump hopper located on the shore, fluidising the sand to create a sand sludge that could be pumped into the centre of the coffer dam.

Jet Pumps also used a UVO 200/150F (D70) high pressure diesel driven pump from Sykes to drive the sand sludge from the hopper and down the 250 metre pipe to the dam at the rate of 100 tonnes per hour.

Once the coffer dam for the first tower had been filled with sand, an inner ring of steel sections was driven into the ground and the central core of sand was excavated down to the river bed so that the foundations for the first tower could be constructed.

Graham Lamond from Jet Pumps comments: “The two 8” submersible pumps were ideal for creating the sand sludge to fill the coffer dam due to the rise and fall of the tide and the pressure boost that the UVO 200/150F (D70) from Sykes Pumps provided enabled us to complete the sand fill operation within just four days, including night works, so that the construction team could get on with the rest of the operation.”




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