We got called to this job after a 2.5m deep hole appeared in this footpath.

Later investigations found a 450mm ductile overflow pipe from a water course had moved, causing a joint to open up and the water had washed away the ground above the pipe.

Due to access issues and unable to dig, we managed to slip line the pipe using a 300mm twin wall grouting between the two and managed to fill the sink hole with a foam concrete.