Culvert - Leigh Hall Colliery - Staffordshire

Land at the former Leigh Hall Colliery had been cleared for a large warehouse complex and the ground thoroughly compacted when a 212m, 1200mm diameter culvert was discovered at an average depth of 7m. Major disruption to the already-compacted ground wasn’t an option, so it was decided to use Benefil. 

Pumping equipment was moved to the culvert by offroad vehicles, and access was excavated to one manhole, giving the Benefil team a distance to fill of 135m in one direction and 77m in the other. Under confined space operating procedures, the team took their equipment into the culvert and were able to pump the grout to achieve a complete fill in both directions.