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ALTO MD 250 Double Width Tower
| Assembly Guide
Erecting & Dismantling the Tower
All Alto towers must be built and dismantled in accordance with the step by step instructions in the
following pages corresponding to the particular tower configuration involved and having regard to the
Work at Height Regulations 2005; PUWER and Health & Safety legislation as appropriate.
3T Method Explained
The “3T” or “through the trapdoor” method is one of the two permitted ways of assembling a tower
without the assembler being at risk of falling. This tower is a 3T tower.
Step 1:
As each new level of platform is installed, the operative
takes up a working position in the trap door of the
platform, standing on the ladder and leaning back
against the edge of the trapdoor aperture.
Step 2:
From this position, the operative fits the horizontal
braces 500mm and 1000 mm above the platform level
(i.e. on the 2nd and 4th rungs above the platform). If
the far end of the guardrail braces don’t fully engage
when they are put in place, the operative fully engages
it when first climbing up onto the platform. This process
ensures that operatives never have to stand on an
unguarded platform.
