Safety and health In building and civil engineering
Shaft supports
32.3.3.
Structures in shafts should be:
kept free of stones and other objects; and
cleaned at suitable intervals.
Headframes
32.3.4.
All shafts over 30 m (100 ft) in depth should have an
adequate headframe.
32.3.5.
Headframes should be strong enough to withstand
safely the maximum loads that they will have to carry.
32.3.6.
Headframes should preferably be of open steelwork
construction.
32.3.7.
If headframes are of timber, they should be treated to
make them fire-resistant.
32.3.8.
Headframes should be earthed or otherwise adequately
protected against lightning.