scaffold tower shown in
Fig. 8.
TRESTLE SCAFFOLD
Figure 8.9.8
A trestle scaffold.5m for boards 50mm thick. The tower built slotting the sections
together until the required height reached.
FIGURE 8.
Trestles which are higher than 3. The maximum span boards between trestles is:
● 1.7
Correct procedure for erecting long extension ladder. least one-third the trestle must
be above the working platform.
. The platform must be
at least two boards 450mm wide.8 shows trestle scaffold.
Start position
Footing
base of
ladder
Lift and walk
towards wall
Continue until
upright
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. Where anyone can fall more than 4. the platform more than above the
ground, toeboards and guardrails must fitted, and separate ladder
provided for access.5m from the working
platform, trestles may not used. Two pairs trestles spanned scaf-
folding boards provide simple working platform.3m for boards 40mm thick
● 2.
MOBILE SCAFFOLD TOWERS
Mobile scaffold towers may constructed basic scaffold components
or made from light alloy tube.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
