Project Description

Overview

Alma Bridge is part of a vital coastal path on the Sidmouth seafront. Due to years of cliff erosion and exposure to the elements, the bridge abutment was left vulnerable to future collapse.

Challenge

As the area is tidal, we had to carefully plan the working windows, constantly monitoring weather conditions and water levels to ensure our team’s safety. Access was also another challenge. Other than temporary steps, there was no way onto the beach. So we had to use a 100 tonne crane to lift all materials down to the working area – as well as a 3 tonne excavator.

Once everything was in place, we excavated the beach down to solid rock along a 15m stretch of the cliff next to the bridge. We drilled holes at 300mm centres and anchored 25mm bars into the rock. We then laid a concrete foundation and built a 3m high temporary shuttered wall, into which we poured 36m3 of concrete to underpin the cliff face and prevent further collapse. The concrete wall was then faced with a masonry finish.

Result

Drawing on our expertise working in tidal areas, we were able to manage the work 100% efficiently and safely. The work was completed to a high standard to ensure it fitted in with its surroundings.

Quick facts

Client: Devon County Council
Project type: Bridges & Structures
Scale: 15m x 3m retaining wall, 36m3 of concrete
Duration: 4 weeks