What Is An Acrow Prop?
Acrow props can be seen on many construction sites and are used to support a structure or transfer a load. Construction props are typically used to support concrete form work while the concrete is curing or to support a roof or overhead structure while removing, replacing or repairing a wall or other supporting structure. They are easy to position and are fully adjustable with in the height range of the prop.
Acrow props consist of two circular steel tubes, an inner tube with a top plate that slides up and down freely inside an outer tube which is attached to the base plate. The inner tube has holes down its length so that you can quickly extend the inner tube to just below the desired height and insert a steel pin to lock in that length. To extend the prop to the correct height the top of the outer tube is threaded and a collar, which is similar to a nut on a bolt, picks up and supports the steel pin. So by rotating the collar and moving it up it extends the inner prop. This allows you to achieve the exact height required.
When it comes to using Acrow Props on your project you have a number of different options to choose from. Acrow Props come in 5 different sizes from a No.0 to a No.4, so how do you choose the right prop for your project?
Start With Your Propping Height
Well the first step is to look at the height or distance that you are looking to prop. Do not use props that are too short by making up the gap with timber or other packer and always use the correct length prop for the job. Similarly, if your propping distance is on the limit of the fully collapsed prop it may be best to select the next size down to ensure that there is enough adjustment in the prop if there is a slight variation on site.
The following table is to be used as a general guide only as specifications will vary with different suppliers. Please check with your supplier for their specific specification.
No.0 — 1050 – 1830 mm ( or 3.44 – 6.00 feet)
No.1 — 1600 – 2800 mm ( or 5.25 – 9.18 feet)
No.2 — 1900 – 3400 mm ( or 6.23 – 11.15 feet)
No.3 — 2170 – 3975 mm ( or 7.12 – 13.04 feet)
No.4 — 3100 – 4900 mm ( or 10.17 – 16.07 feet)
Estimate The Load That You Need To Support.
The second step is to look at what load the prop is required to support. You will need to consult your Engineer or other responsible persons regarding the weight of the overhead structure so they Red Door Homes Los Angeles can determine what loads are required to be supported. Where the load is higher than the capacity of a single prop you can use multiple props to increase the supported load in a given area.
The following table is to be used as a general guide only as specifications will vary with different suppliers. Please check with your supplier for their specific specification.
No.0 — 22 – 42 KN — 2243 – 4282 kg ( or 4945 – 9442 lbs)
No.1 — 12 – 34 KN — 1223 – 3467 kg ( or 2697 – 7643 lbs)
No.2 — 11 – 39 KN — 1121 – 3976 kg ( or 2472 – 8767 lbs)
No.3 — 7 – 35 KN — 713 – 3569 kg ( or 1573 – 7868 lbs)
No.4 — 7 – 20 KN — 713 – 2039 kg ( or 1573 – 4496 lbs)
Ensure that wherever you use a construction prop that the structure at both the base and the head of the prop are solid and strong enough to support the desired load. If there is any doubt then it would be a good idea to spread the impact of the prop by using a spreader beam or plate.
Remember that the correct selection of your props is critical to the safety and efficiency of your building New Small House Plans 2018 site and must always be signed off by a suitably qualified engineer or other qualified person.