How to Use Acrow Props in Five Easy Steps

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Acrow Props are indispensable tools for formwork support in construction projects worldwide, providing robust support for vertical loads. This guide outlines a streamlined approach to effectively use Acrow Props and their typical applications in the building industry.

The invention of the Acrow Prop dates back to the 1940s, created as a solution to the conventional timber props that were prevalent at that time. Their popularity surged when Sir Robert McAlpine adopted them in construction.

Consult a Qualified Engineer

Before commencing any project, it is crucial to ascertain:

• The total vertical weight that requires support;
• The floor's ability to bear that weight;
• If additional support like Strong Boys or Timber Needles is necessary;
• The quantity of props required for safely supporting the load.

Consulting with a structural engineer will provide insights regarding the correct number of Acrow Props to deploy. If sourcing a professional proves challenging, many wholesale suppliers can recommend trained experts.

It is extremely hazardous to support beams, roofing, or masonry without engineering advice. Doing so jeopardizes the safety of the worksite and the individuals present.

Select Acrow Props with Appropriate Height and Load Capacity

Since their inception almost a century ago, Shoring Props are available in six standardized sizes, each with specific weight capacities as detailed in the Acrow Prop Capacity Table below.

Acrow Prop Capacity Table

Size
Min. Height (mm)
Max. Height (mm)
Open Weight Capacity (t)
Closed Weight Capacity (t)
00
600
900
1.1
1.5

0
1200
2300
1

1.5
3500
2000

1.9
3300
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3
2200
2900
4

1.3
2000
The load capacity of the props must always exceed the weight they support. It is advisable to have extra props on hand as a precaution against any failures. Taller Formwork Props sacrifice capacity for increased height, necessitating the use of more props on elevated structures.

Engineers typically advise one Acrow Prop for every meter; however, this can vary based on the specific job. Ensure an even distribution of props for consistent load support.

Prepare the Load-Bearing Surfaces

Additional work may be needed to establish suitable load-bearing surfaces. The risk of structural failure is significant if the underlying floor joists and timber cannot support the weight of the props.

A suitable load-bearing surface must be flat, level, and capable of bearing heavy loads. Even if a floor doesn’t collapse, excessive loading can compromise its integrity.

Timber floors, while often able to support Acrow Props, are prone to damage; thus, thorough inspections are crucial. Concrete surfaces are ideal as they can consistently support heavy weights.

Set Up and Secure the Acrow Prop

Begin installation by raising the inner tube and inserting the prop pin to achieve a rough height. Then, adjust the prop to the precise height using the handle on the adjustable collar, tightening it further with a wrench if needed.

Ensure that the prop stands perfectly vertical and immobile. The load-bearing performance of a prop is significantly compromised if it tilts beyond 1.5 degrees.

Allow the load to rest upon the prop, which should support a structural beam or joist accordingly. Regular inspections of the props at the beginning and end of each workday are crucial, maintaining their setup until the project concludes.

Bear in mind that the weight being supported by the props may fluctuate throughout the project duration. Stay alert to ensure that any changes do not surpass the props' load limits. A quick visual guide can be helpful; consider watching our related video.

Utilize Strong Boys and Timber Needles for Masonry Support

This step is optional and applies exclusively when supporting masonry. For brickwork and masonry, horizontal support is essential in addition to vertical support.

Strong Boys connect onto Acrow Props and extend outward into sections of removed brick. Multiple Strong Boys can adequately sustain a brick wall positioned above them.

Timber Needles function similarly and fit where bricks have been removed, acting as a platform that distributes weight evenly across two props beneath the needle. Needles are especially useful for long-term projects with heavy loads.

This guide aims to help you avoid basic errors and ensure a safe working environment.

You can purchase Formwork Props online or visit our stores in Dandenong or Laverton, Melbourne. We also provide nationwide delivery. Should you have further inquiries on the usage of Acrow Props, feel free to contact us at 622 686 or reach out via our website.

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