NORWEST SOIL Engineering has used an in-house designed limited headroom vibroflotation rig on a project to upgrade a railway carriage works in West Yorkshire.
The firm, working for Bombardier Prorail and Lincoln-based management contractors Simons, built the restricted height vibroflotation equipment to treat 3,000m2 of ground for phase two of the works inside the facility near Wakefield with a restriction of 7.2m.
Normal work- ing height of the vibroflot rig is 15m, so Norwest Soil Engineering built a new mast arrange- ment and redesigned the reduced length vibroflot at its Leeds depot for the work.
The firm also carried out the first phase of the contract, treat- ing 10,000m2 of ground and instal-ling 300, 350mm diameter and 13m deep CFA piles.
Although this phase was not subject to height restrictions or affected by the adjacent railway, the five week project required constant vibration monitoring of Railtrack property to ensure levels were below the specified limit of 10mm/s.