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Using Acrow props as trench struts

Using Acrow props as trench struts

Using Acrow props as trench struts

(OP)
I have a temporary works job where the design engineer has specified acrow props to be used as trench struts. I am used to these being used in a vertical position such as for supporting formwork or an opening but I am dubious about their capacity in a horizontal position.

Has anyone had any experience with this?

RE: Using Acrow props as trench struts

The water authority that I used to work for used them for many years in trenching operations and they were satisfactory. I had a few problems in severe works (had 2 that completely buckled !) but generally they are quite good.

RE: Using Acrow props as trench struts

(OP)
Thanks

Do you use the full rated capacity or reduce the a little for bending?

RE: Using Acrow props as trench struts

We just used them didn't worry about designing them, it was for timbering and some trench shielding and they were about 4' long.  If your designing, I would reduce the rated capacity by maybe 5 to 7% due to the bending.  Other than that they are quite good for this application.

RE: Using Acrow props as trench struts

(OP)
Thanks, I automatically discounted them when I saw them but i may rethink that.

RE: Using Acrow props as trench struts

I have seen acrow jacks used to prop trench sheeting on a number of occasions with no problem.  The trenches were usually pretty small.

Used horizontally there would be an additional bending generated within the prop but I would expect this to be pretty small.  The bending may induce secondary effects as the prop is not a single member as gravity would tend to to pull it to one side.  Whether this is significant, not sure.

I would have though the axial loads generated by the retained material would be pretty small. Unless you had a very deep excavation and significant plant surcharge.  In such cases then it is maybe more advisable to use a waling frame, or a properly designed trench shutter.

RE: Using Acrow props as trench struts

(OP)
thanks ussuri and civeng80,

I cannot find anything to say definately no but I cannot find any guidance on it either. At least I know it has been done elsewhere.

RE: Using Acrow props as trench struts

I would check with Acrow. Why not use trench jacks which are designed for this purpose?

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