Royal Hotel, Guernsey

Doran Consulting was appointed by the Longport Group, to design a combi-pile retaining wall for a double basement car park at the Royal Hotel in Guernsey. The combi-pile wall comprised 457mm diameter tubes at 2.75m centres with AU16 intermediate piles.

The wall is 150m long, with retained heights ranging from 4 to 8m. The tubes have been installed using cased auger piling rigs to socket into the underlying Gabbro. The wall is supported with two levels of duckbill anchors in the temporary case and by the basement floor slabs in the permanent case.