A Kent construction company has been fined for unsafe excavation work after a worker was seriously injured at a building site in Cranbrook.

The BBS Construction Ltd employee, who does not wish to be named, smashed his right hip in the incident at Benenden School for Girls on 18 January 2011 when the face of an excavation some four metres in depth collapsed on top of him.

He also injured his left knee after being buried up to his waist by earth and rubble, and was unable to work for several months before eventually returning.

Maidstone Magistrates' Court heard that the collapse occurred during work to build a new multi-storey science block, which Tovil-based BBS Construction was contracted to deliver.

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The injured worker, then aged 44, was excavating a basement to support the new building. However, concrete to fix the posts for a supporting wall had been overpoured and the excess had to be chipped away with a manually-operated hydraulic breaker. It was this work that triggered the collapse.

A quick-thinking excavator driver managed to stem the flow of earth by placing the bucket of his machine into the face of the weakened earth, but his colleague was still caught and trapped. Another worker managed to jump clear.

The Health and Safety Executive (HSE) investigated the incident and established that the risks of manually breaking the excess concrete were not properly assessed.

An inspector also found that earlier in the project a waste water drain had been installed by BBS less than half-a-metre from the face of the basement excavation at a depth of two metres. Magistrates were told that this may have weakened the earth around the basement and made it more susceptible to collapse.

BBS Construction Ltd, of Church Street, Tovil, Maidstone, was fined £8,000 and ordered to pay £10,536 in costs after pleading guilty to a single breach of the Construction (Design and Management) Regulations 2007.

(CD)