DUCKBILL GROUND anchors from WT Anchor Systems have been used to secure a new sewer pipeline crossing the River Eamont at Penrith in Cumbria.
The original upvc sewer pipe had shifted in a trench cut in the river bed. To prevent future uplift and avoid contamination of the river, the replacement 225mm diameter ductile iron pipeline was laid in the trench and fixed with ten pairs of Duckbill MR3 stainless steel mechanical anchors.
Contractor DW Craig, working for Eden District Council (agent for North West Water and the Environment Agency), used a breaker mounted on an excavator to drive the anchors 3m into the river bed gravels before tensioning them to a working load of 40kN.
Kevlar straps were then used across the pipeline between each anchor pair using webbing cleats and load nuts to restrain the pipe and prevent it from floating if it ever becomes empty.
WT Anchor Systems says the stainless steel anchors have long term corrosion resistance and as grout is not used, they can be installed quickly with immediate load application.