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CROSS Safety Report

Shutter failure during concrete wall pour

Report ID: 766 Published: 1 April 2019 Region: CROSS-UK

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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:

  • Acting on advice given by the Temporary Works Coordinator can ensure work activities are carried out safely

  • 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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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It was found that some of the ties had not been correctly installed initially and had been replaced by resin fixed ties anchored to the piles.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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