8 shows trestle scaffold.
TRESTLE SCAFFOLD
Figure 8.
MOBILE SCAFFOLD TOWERS
Mobile scaffold towers may constructed basic scaffold components
or made from light alloy tube. the platform more than above the
ground, toeboards and guardrails must fitted, and separate ladder
provided for access.
Start position
Footing
base of
ladder
Lift and walk
towards wall
Continue until
upright
FIGURE 8. Where anyone can fall more than 4.8
A trestle scaffold.
FIGURE 8.
. The boards which form the working platform should
be equal length and not overhang the trestles more than four times
their own thickness.9.Basic Electrical Installation Work
168
Safety First
Scaffold
● scaffold mobile towers are
always safer than ladders for
working above ground.6m must tied the building give
them stability.5m for boards 50mm thick. Two pairs trestles spanned scaf-
folding boards provide simple working platform. The tower built slotting the sections
together until the required height reached.7
Correct procedure for erecting long extension ladder. 8.3m for boards 40mm thick
● 2. The platform must be
at least two boards 450mm wide.
Trestles which are higher than 3. scaffold tower shown in
Fig. least one-third the trestle must
be above the working platform.5m from the working
platform, trestles may not used. The maximum span boards between trestles is:
● 1
