Two workers fell two-and-a-half metres in the incident on 8 July last year, although both escaped with only minor injuries.
Plymouth Magistrates' Court heard that the workers were pouring concrete onto a deck to form the floor of a weights area at the dry dive centre. However, no temporary support was used and the combined weight of the two men and concrete caused it to give way.
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An investigation by the Health and Safety Executive (HSE) found that Balfour Beatty Construction Scottish and Southern Limited failed to ensure that sufficient steps were taken to protect workers during the construction work that led to the collapse.
The company did not follow its own temporary works procedure and should have checked that the deck was properly supported before allowing the work to commence.
Balfour Beatty Construction Scottish and Southern Ltd, of 24 Ravelston Terrace, Edinburgh pleaded guilty to a single breach of The Construction (Design and Management) Regulations 2007. The company was fined £2,000 and ordered to pay costs of £5,347.
(CD/GK)
