Secure & Innovative Solution To Sensitive Water Scheme
An intricate cofferdam solution was essential to allow the construction of a new pumping station on the River Clodiagh near Holycross, County Tipperary.
Main contractor Glan Agua in conjunction with their Civil Engineering Partner, MEIC Ltd have built the new intake chamber and pump house on a site directly alongside the river, upstream of the R661 Rathkennan road bridge.
Approximately 50 x 15 m long precast concrete piles were required to support the concrete structures of the pump house, gravity main and intake chamber. These were installed by specialist contractor Taranto Ltd.
Three interlinked cofferdams were required for the construction of the facility with a safe, dry working area inside despite the poor silty ground and the high water table.
The excavations reached a depth of 6 m with the water table at 1.5 m below original ground level.
The cofferdams utilised 7 m long Larsen L603 sheet piles to enclose the intake chamber and gravity main. The holding tank – which is located underneath the pump house itself – required 11 m long Larsen L605 sheet piles.
Support for these cofferdams was provided by Groundforce heavy duty hydraulic frame, Megabrace HSK150 hydraulic prop, with 150 t capacity installed as knee-braces across the corners
In the deep excavation housing the holding tank and pumping station, Groundforce provided three levels of Megabrace and eight knee-braces.
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