Contract Details

Cumnor Construction Ltd. carried out the role of Works Contractor and PSCS for this project.

This contract required specialised work involving the installation of soil nails/ground anchors and the application of spray applied concrete to the cliff walls and slopes.

Environmental control procedures were implemented so as not to contaminate the sea water. A temporary platform had to be constructed to a level above the highest tide while the work was being completed. This was constructed using Rock Armour and netting. The existing slope face was cleared of all vegetation and loose material. The face of the slope was cut back and graded for the full height so that the toe of the shotcrete rested on the rock and was supported for its full height by the rock. Runoff from grouting and shotcreting was prevented from entering the water.

53 self-drilling hollow bar soil nail anchors were installed and proof tested.  Drainage was required to the cliff front face behind the shotcrete. Additional drainage to the body of the cliff soil required drilling into the cliff face and installation of PVC drains. Shotcrete was applied to the cliff face and was coloured to help blend into the surrounding cliff.  The shotcrete was reinforced in its centre using two layers of 2.4mm galvanised triple twist wire mesh.