OHS Code Explanation Guide

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

Section 464 Tunnel

Subsection 464(1)

Temporary protective structures used to retain the walls of a tunnel while it is being excavated must be certified by a professional engineer. This ensures that the structures are designed and installed to prevent the walls from collapsing or caving in.

Subsection 464(2)

Water can introduce an unacceptable hazard since it can cause the walls or supporting structures of a tunnel to deteriorate. The accumulation of water must therefore be controlled. The employer must ensure that suitable, efficient machinery or devices are available for this purpose.