Contractors World


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Contractors World UK & Ireland
2011 Volume 1 Issue 8
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Contractors_World_UK_JCB ensures rapid river crossing for pipeline firm
 

 

 

Waiting use JCBs to ensure rapid river crossing for pipeline project

Six JCB excavators were involved in a complex and time sensitive application – laying 140 metres of pipeline under a Lancashire riverbed.

Cumbria-based drainage and pipeline specialist, Waitings had just 24 hours to lay the pipeline during low tide on the River Lune in Lancaster.

Waitings undertook this work on the United Utilities project on behalf of main contractor Volker Stevin. It involved the installation of a new sewer pipeline two metres beneath the river bed as part of a project to enhance the city’s sewer network both north and south of the river. The upgraded network will provide a more effective system by capturing a larger volume of water during storm conditions.

The result will be fewer overflows into the River Lune which will help meet tough EU standards on water quality. The task was subject to the strict time-frame imposed by the Environment Agency due to tidal influence and unseasonal flood risks in the region.

To achieve the river crossing aspect of the installation within the allotted 24 hour slot, Waitings employed several JCB units including one JS360, two JZ235 and three JS220 tracked excavators along with a 3CX backhoe loader and a JCB 22kvA generator.

Constructed on the river bank, approximately 140 metres of 560 mm diameter polyethylene pipeline was welded together before insertion into 130 metres of 600 mm diameter welded steel piping.   Constructed on the river bank, approximately 140 metres of 560 mm diameter polyethylene pipeline was welded together before insertion into 130 metres of 600 mm diameter welded steel piping.

After the JCB JS units had excavated a two metre trench in the riverbed, the entire 35 tonne pipe string was pressure tested and carried into the channel by the six JCB excavators which were evenly spaced across the river. The pipeline was then lowered into place, weighed down by pumping water into it and secured in place by 17 special cast five-tonne concrete blocks.

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