OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 32 Excavating and Tunnelling

Section 463 Prohibition

The area at the bottom of a shaft can become belled – enlarged to a greater diameter than the designed shaft – as a result of excessive excavation, slumping or unplanned ground failure. Such a belled area presents a major hazard to workers and additional temporary structures must be installed before workers are allowed to enter the belled area.