Rotary percussive rods used on Great Yarmouth flood alleviation scheme
As a continuation of the Great Yarmouth Flood Alleviation Scheme (Compartment C), Keller Geotechnique was awarded the sub-contract to install and test both the Preliminary Trial Anchors and the Main Wall Permanent Anchors for Walls 82-90.
Vertical drilled depths ranged from 22-24.5m and the 30 deg. inclined probe was 52m long, all drilled using a 133/76 rotary-percussive water flush drilling system with full length temporary drill casing supplied by Colcrete Eurodrill, together with a CX4/10 mixer pump which provided grout for the anchors.
Working anchor installation was carried out over the River Yare using two specially adapted CAT 315 excavators and drill masts fitted out and assembled by Keller in their Coventry Depot.
These rigs, in conjunction with a robust, over water working platform, designed and provided by BAM Nuttall, have achieved a commendable installation rate on an extremely challenging project.