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Acrow Props are an essential tool when removing structural support beams. They support masonry loads until permanent supports can be replaced or installed.
The general rule is to use an Acrow Prop every one metre for supporting a structure. Acrow Props should distribute evenly with the combined weight capacity exceeding the load they’re supporting.
Determine The Number of Acrow Props Based on These Factors
Acrow Prop Rating
Available in six adjustable sizes, each Acrow Prop is rated for their structural load capacity. The larger the size (or the longer you extend a singular prop), the less weight capacity you will have.
For example, a size one prop extends between 600 to 900mm and supports 1,500kg when fully closed. Meanwhile, a size three prop extends between 2.5 and 3.9M, but can only support 2,900kg when closed.
This rule makes it ideal for builders to choose the shortest prop that is feasible on the worksite to reduce the number of props required.
Size | Min. Height (mm) | Max. Height (mm) | Open Weight Capacity (t) | Closed Weight Capacity (t) |
00 | 600 | 900 | 1.1 | 1.5 |
0 | 1070 | 1820 | 1.2 | 2.3 |
1 | 1750 | 3120 | 1.5 | 3.5 |
2 | 1980 | 3350 | 1.9 | 3.3 |
3 | 2590 | 3950 | 2.2 | 2.9 |
4 | 3200 | 4870 | 1.3 | 2.0 |
Angle of Prop
Similar to any temporary structure supporting a heavy loads, an Acrow Prop must be vertically straight to maximise weight capacity.
If a prop is angled even two degrees off-centre, it can severely impact its maximum holding capacity. If terrain hinders props from standing straight, a structural engineer will need to assess the next best step forward for the worksite.
It is possible for props to operate at an angle, but more are required.
Usage of Scaffolding
Scaffolding can act as bracing when in an area using multiple Acrow Props. Horizontal bracing with couplers can ensure adjacent props can bear the brunt when one fails.
Horizontal bracing also enables weight acting on the props to distribute more evenly to enhance structural stability.
How Many Acrow Props Per Metre?
The rule of thumb is to use an Acrow Prop on a per metre basis for supporting a structure. Despite the general rule, there are various factors that can influence spacing including:
- Total Load;
- Unusual conditions;
- Prop size; and
- Base material.
It is vital and often a mandate to consult with a structural engineer to ensure the correct number of props on a construction site. Speak with our team at 1300 622 686 for a quote, or, visit our Sydney branch for more information.
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