Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more



TEMPORARY SUPPORT equipment from shoring supplier MGF is helping main contractor Costain build a treatment plant at Barrow water treatment works near Bristol.

The project for Bristol Water lies close to treatment plant and services and involves excavation of a large pit for settlement tanks.

The pit is 25m long, 17m wide and nearly 6m deep so careful shoring was needed to provide a safe working environment and to prevent settlement damaging nearby structures, including a 1,500mm diameter gravity water main.

The final design comprised a cofferdam of Larssen LX8 sheet piles supported at two levels with MGF's hydraulic tank braces and struts. The top frame consists of a heavy duty tank brace with 15t power packs, mechanical Superstruts with 540kN Superstrut extensions acting as knee braces and cross struts.

The bottom frame is similar, but employs 30t power packs to counteract the greater lateral forces at the bottom of the excavation.

Work is due to finish in July.

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Please note comments made online may also be published in the print edition of New Civil Engineer. Links may be included in your comments but HTML is not permitted.