Safety body Structural-Safety has released its quarterly update detailing recent failings with grade 10.9 bolts.
The report found that following an incident, there had been a high potential for collapse when supposedly grade 10.9 high strength holding bolts failed on a crane base. It said that sixteen bolts, which had been pre-tensioned using the standard process, all failed within four days.
The organisation said that it believed the failure was due to delayed hydrogen embrittlement, which can be caused during the manufacturing process.
A warning over inadequate structural design at a school has also been highlighted in the report, which is aimed at improving safety in the construction industry.
Speaking generally about safety, a Structural-Safety spokesperson said that there had been a worrying number of near misses in the UK and elsewhere.
The new body has incorporated Scoss (Standing Committee on Structural Safety) and the Cross (Confidential Reporting on Structural Safety) scheme, and provides a confidential tool for reporting incidents within the construction industry.
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