PASMA Tower Assembly Methods 3 — Questions and Answers
Question 1: What does the term 'base height to width ratio' refer to in tower scaffold design?
- The ratio of the base dimensions to the maximum permitted height of the tower (Correct answer)
- The weight distribution of the base plates
- The number of base frames relative to upper frames
- The colour coding system for base components
Correct answer: The ratio of the base dimensions to the maximum permitted height of the tower
The base height to width ratio determines the maximum height a tower can safely reach relative to its narrowest base dimension. For indoor use, the ratio is typically 3.5:1 and for outdoor use 3:1.
Question 2: When using the traditional method of assembly, what is the main disadvantage?
- It uses more components
- There is a period where the operative works without edge protection (Correct answer)
- It takes twice as long
- It can only be used outdoors
Correct answer: There is a period where the operative works without edge protection
The traditional method requires the operative to stand on a platform without guard rails while installing them, creating a period of unprotected working at height. This is why the AGR and 3T methods are preferred.
Question 3: What is the purpose of a toeboard on a tower scaffold platform?
- To help operatives keep their balance
- To prevent materials and tools from falling off the platform edge (Correct answer)
- To mark the edge of the platform with a colour
- To improve the appearance of the tower
Correct answer: To prevent materials and tools from falling off the platform edge
Toeboards are at least 150mm high and are fitted at platform edges to prevent loose materials, tools, and debris from falling off the platform and striking people below. This is a requirement under the Work at Height Regulations 2005.
Question 4: What is the recommended maximum height for a standard mobile tower scaffold used by a PASMA trained operative?
- There is no maximum; it depends on the manufacturer's instruction manual (Correct answer)
- 4 metres
- 8 metres in all cases
- 50 metres
Correct answer: There is no maximum; it depends on the manufacturer's instruction manual
There is no single universal maximum height — the permissible height depends on the specific manufacturer's design, the instruction manual, and the base-to-height ratio. Operatives must always follow the manufacturer's guidelines for the specific tower system being used.
Question 5: During assembly, where should tower components be stored before being passed up?
- Leaning against the partially built tower
- Neatly stacked close to the base but clear of the working area (Correct answer)
- On a nearby roadway for easy access
- On the roof of an adjacent building
Correct answer: Neatly stacked close to the base but clear of the working area
Components should be stored neatly and close to the tower base for easy access, but clear of walkways and the working area to prevent trip hazards and avoid obstructing emergency access.
Question 6: What must happen to the castors before any operative climbs the tower?
- They must be removed entirely
- They must be locked using the wheel brakes (Correct answer)
- They must be inflated to the correct pressure
- They must be oiled for smooth movement
Correct answer: They must be locked using the wheel brakes
All castor wheel brakes must be fully applied and locked before anyone climbs or works from the tower. If the tower moves while occupied, it could strike an obstruction and overturn.
PASMA Tower Assembly Methods 3
What does the term 'base height to width ratio' refer to in tower scaffold design?