1. What is an Acrow Prop and what's it for?

An Acrow Prop (also known as an acro prop or jack post) is a telescopic steel support used in construction. It provides temporary vertical support for structures during building, repairs, or alterations. Think of it as a temporary steel column holding things up.

2. What sizes do Acrow Props come in, and what's their capacity?

Dynaton offers a comprehensive range of Acrow Props to suit various construction needs. These props are made from high-quality, hot-dipped galvanized steel, ensuring durability and compliance with Australian and New Zealand Standards. The available sizes and their specifications are as follows:

• Super Stump: Closed Height: 270 mm | Open Height: 420 mm
• Stump Pro: Closed Height: 450 mm | Open Height: 700 mm
• Size #00: Closed Height: 690 mm | Open Height: 1163 mm
• Size #0: Closed Height: 1090 mm | Open Height: 1833 mm
• Size #1: Closed Height: 1620 mm | Open Height: 2620 mm
• Size #2: Closed Height: 1950 mm | Open Height: 3210 mm
• Size #3: Closed Height: 2590 mm | Open Height: 3935 mm
• Size #4: Closed Height: 3200 mm | Open Height: 4950 mm

The load capacities of these props vary depending on their extension length. For instance, the maximum load capacity ranges from 7 kN to 42.5 kN, with shorter extensions supporting higher loads. Always refer to the manufacturer's specific load charts and consult a structural engineer to determine the appropriate prop size and quantity for your project.

3. How do I adjust an Acrow Prop's height?

To adjust an Acrow Prop's height, pull the pin to roughly set the desired height. Then, fine-tune it by turning the prop collar (winding handle) on the outer tube, which moves the inner tube up or down on a screw thread.

4. How many Acrow Props do I need?

The number of Acrow Props required depends on the weight you're supporting, the prop's safe working load (SWL) at your chosen height, and how you're using them (e.g., with sole plates or strongboys). Always consult a qualified structural engineer to determine the exact number and placement for your specific project.

5. How long can Acrow Props stay in place?

Acrow Props are intended for temporary use. For new masonry, they might be removed after 24–48 hours. For other structures, only remove them once the permanent support is finished and certified by an engineer. If left for extended periods, inspect them regularly (at least weekly).

6. Can Acrow Props be used horizontally?

No, Acrow Props are designed for vertical support only. Using them horizontally or at extreme angles is unsafe and can lead to structural failure.

7. What other types of vertical props are there?

In addition to standard steel Acrow Props, Dynaton offers a range of advanced vertical support systems designed to meet various construction needs:

• Multi System Props (MSP Props): Dynaton's MSP Props are engineered for precise slab support in construction projects. With millimeter accuracy and five adjustable sizes, they cater to a range of typical heights from 1.5m to 5m. These props provide reliable and consistent support, boasting a loading capacity of up to 40kN. Constructed from hot-dipped galvanized steel, they offer excellent resistance to rust and are designed to withstand the rigors of construction environments. Features include numbered height adjustment holes for easy on-site adjustments and an impact-resistant design in the bottom section of the outer tube. MSP Props are certified to Australian/New Zealand standards, ensuring quality and safety.
• Aluminium Props (ALU Props): Lighter than steel props, aluminium props are easier to handle and transport. Despite their lighter weight, they often have high load capacities, making them suitable for various construction applications.
• Heavy Duty Shoring Systems: Designed for supporting very heavy loads or high structures, these systems are often modular, allowing for flexibility in assembly and disassembly. They are ideal for large-scale construction projects requiring robust support solutions.

8. What are the key safety rules for using Acrow Props?

• Use the correct size prop for the load.
• Place props on stable foundations (like sole boards).
• Always position props as vertically as possible.
• Spread the load at the top and bottom with plates or timber.
• Never exceed the Safe Working Load (SWL).
• Inspect props regularly for damage.
• Do not remove props until the permanent structure is safe.
• Wear appropriate Personal Protective Equipment (PPE).
• Ensure all workers are trained and competent.

9. How should Acrow Props be stored when not in use?

Store Acrow Props in a dry and sheltered area to prevent rust and moisture damage. Position them vertically, resting on their base plates, to maintain their integrity and shape. Proper storage extends their lifespan and ensures they remain safe for future use.

10. What should I inspect before using an Acrow Prop?

Before each use, inspect the Acrow Prop for:

• Surface Condition: Check for rust, dents, or other physical damage.
• Threads: Ensure threads are clean and undamaged for proper adjustability.
• Pins and Collars: Verify that pins are not bent or damaged and that collars move freely.
• Straightness: Confirm that inner and outer tubes are straight and telescope smoothly.

Regular inspections helps prevent accidents and maintain structural integrity.

11. Do Acrow Props require bracing?

Yes, in certain applications, especially when used in open areas or where lateral forces may be present, Acrow Props should be braced to prevent movement. Bracing helps maintain the prop's position and ensures stability under load.

12. What accessories are available for Acrow Props?

Dynaton Sales & Hire offers a comprehensive range of Acrow Prop accessories designed to enhance functionality and ensure safety in various construction applications:

U-Heads:

• Single U-Head: Ideal for supporting single beams or joists.
• Double U-Head: Suitable for wider beams or dual joist support.

Swivel Head Kits:

• Allow for angular adjustments, accommodating sloped surfaces or non-standard alignments.
• Includes male and female swivel head parts and necessary bolts.

I-Beam Supports:

• Designed to securely hold I-beams atop Acrow Props, ensuring stability during construction.

Formwork Tripods:

• Provide lateral stability to vertical props, especially useful in free-standing applications.

Base Plates:

• Distribute the load at the base of the prop, preventing ground penetration and enhancing stability.

Prop Pins:

• Available in various styles, including G-style, D-style, and chain-style, for securing the inner and outer tubes of the prop at the desired height.

Forge Nuts:

• High-strength nuts used for fine height adjustments and securing the prop's position.

Wall Supports (Strongboys):

• Facilitate the support of masonry walls when creating openings, such as for doors or windows.

DYNATON Multi System PROPS (MSP Props) outperform Acrow Props in several key ways, making them an excellent choice for precise slab support in construction:

1. Precision and Adjustability: MSP Props offer millimeter-accurate height adjustment, ensuring precise support tailored to your project's needs.

2. Higher Loading Capacity: With a loading capacity of up to 40kN, MSP Props can handle heavier loads compared to Acrow Props, providing greater flexibility.

3. Durability: Galvanized for rust resistance, MSP Props have a longer lifespan, reducing the need for replacements and maintenance.

4. Versatility: Available in five dimensions, MSP Props suit various height requirements, allowing for adaptability on different projects.

5. Compatibility: MSP Props can be used with double and single Li-heads to hold beams and bearers and with tripod stands to stabilize LVLs during installation, making them a versatile choice for construction.

In summary, MSP Props offer precision, strength, durability, versatility, and compatibility with various construction equipment, making them a superior option for efficient and reliable slab support when compared to traditional Acrow Props.