CASE STUDIES
Groundforce provides comprehensive support package for water diversion
Groundforce Shorco and sister division Piletec have come together to provide a turnkey ground support package on a mains water diversion project in the Midlands.
The project involved re-routing the strategic watermain under a new railway line, currently under construction, at Lavender Hall Farmat Berkswell, near Coventry.
Contractor JMurphy & Sons is carrying out the complex operation for customer Severn Trent, which has involved eight different designs that overlap to allow
the installation of the pipework and UTX (under track crossing) chamber.
Murphy is installing 110mof 1200mm concrete sleeves in a 6m-wide, 6m-deep open trench under a railway line to allow for futuremaintenance and removal without causing disruption to the railway line operations.
“The new pipelines run parallel to the existing watermain about 30mto the south. But they need to be deeper to allow the railway to be built over the top,” explainsMurphy’s projectmanager Sam Woodyatt.
The length of UTX concrete sleeve being installed under the railway is 110m. The length of each watermain diversion is 220m. Support for the 6m-deep trench is provided by Groundforce Shorco’s rolling strut trench boxes extended to their full width of approximately 6.3m.
The trench boxes avoid the need to install steel sheet piles along the full length of the excavation. Instead, Murphy is using 11 rolling strut boxes which are deployed progressively, in ‘leap-frog’ fashion.
As work progresses along the route of the pipeline,Murphy backfills the trench as it goes, removing each trench box in turn fromthe rear of the excavation and re-installing it at the forward end.
Groundforce Shorco trench boxes are a popular choice for pipeline installation in relatively shallow trenches due to the speed and simplicity of installation. Rolling strut boxes differ from conventional fixed-strut boxes in that the rolling struts enable both plates tomove independently of each other during installation and removal.
This has the benefit that during the installation process, parallel plate movement vastly reduces the potential for horizontal soilmovements compared tomore conventional box strutting
20 | June 2023 |
www.draintraderltd.com
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