CROSS Safety Report
Shutter failure during concrete wall pour
This report is over 2 years old
Overview
A reporter describes how a shutter failed during a concrete wall pour due to resin fixed ties not being allowed to cure.
Key Learning Outcomes
For construction professionals:
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Acting on advice given by the Temporary Works Coordinator can ensure work activities are carried out safely
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Regular toolbox talks are a good way of engaging with work crews and ensuring information such as resin anchor curing times are communicated to them
Full Report
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The Full Report below has been submitted to CROSS and describes the reporter’s experience. The text has been edited for clarity and to ensure anonymity and confidentiality by removing any identifiable details. If you would like to know more about our secure reporting process or submit a report yourself, please visit the reporting to CROSS-UK page.
A concrete wall was being poured between a shutter and exposed piles. The shutter was tied to the exposed piles at the top and bottom using proprietary 15mm diameter high tensile threaded bars. Part way through the pour, says the reporter, the concrete pump broke down and needed repair. On the final load of the pour, the concrete was pumped into the shutter too quickly applying to much pressure on the ties at the bottom of the shutter, causing them, and the shutter, to fail.
It was found that some of the ties had not been correctly installed initially and had been replaced by resin fixed ties anchored to the piles. The Temporary Works Co-ordinator (TWC) advised that the resin anchors should be allowed to cure for 16 hours, but this advice was not followed and hence the failure occurred.
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