PASMA Tower Assembly Methods 2

Question 1

What is the correct sequence for dismantling a mobile tower scaffold?

Accepted Answer

Top down, reversing the assembly procedure

Answer

Towers must always be dismantled from the top down, reversing the assembly sequence. This maintains structural integrity throughout the process and ensures operatives are always working from a stable platform.

Question 2

What is the purpose of horizontal braces (ledgers) in a tower scaffold?

Accepted Answer

To provide lateral stability and maintain frame spacing

Answer

Horizontal braces connect the two frames together, maintaining the correct spacing and providing lateral stability. Without them, the tower would be prone to racking and collapse.

Question 3

What is the function of diagonal braces on a tower scaffold?

Accepted Answer

They prevent racking (lateral sway) of the tower

Answer

Diagonal braces prevent racking, which is the tendency of the tower to sway or lean sideways. They triangulate the structure, converting it from a potentially unstable parallelogram into rigid triangles.

Question 4

When assembling a tower, at what height must a platform with edge protection first be provided?

Accepted Answer

At any height where there is a risk of a fall

Answer

Under the Work at Height Regulations 2005, there is no minimum height threshold — platforms and edge protection must be provided at any height where a person could fall and injure themselves. Even falls from low heights can cause serious injury.

Question 5

What type of locking mechanism is typically used to secure frames together during assembly?

Accepted Answer

Spring-loaded gravity locks or wind locks

Answer

Modern tower scaffolds use spring-loaded gravity locks (also called wind locks or spigot clips) that automatically engage when frames are connected. These must be checked to ensure they have fully locked into position.

PASMA Practice Test

PASMA Practice Test

PASMA Tower Assembly Methods 2