Shoring - what is proper way to distribute lod to s.o.g.?

[ajk1]

The attached photo shows temporary steel post shores placed under a reinforced concrete suspended slab in preparation for repairs. Are the wood blocks placed eccentrically under the base of the post shores the way it is usually done when the post is supported by a slab-on-grade? I am surprised a) that the blocks are smaller in area than the bottom steel plate on the post shore, and b) that many of them are eccentrically placed.

 

[hokie66]

No photo, ajk1.

 

[ajk1]

Sorry. Here are 3 photos now.

 

[Brad805]

That looks sketchy. 2x4's is not what I would think of for timber cribs. The wood looks largely pointless. I would expect something like a 6x6 if I were hoping to distribute to a larger floor area.

 

[thaidavid40]

For small posts like this, some 4x4s (or larger) stacked cross-ways in two layers to form a cribbing, would be more typical. That would distribute the post loads more widely, and uniformly.

Thaidavid

 

[kingnero]

This practise does not serve for load distribution, I'd even say if the contact area wood-floor is smaller than the footplate of the post, it concentrates the load even more.

The first one is essentially a wig, so I'd hazard a guess and say it was ment to take out the slack of the post, in a real bad manner.

 

[hokie66]

Those are just shims, and too small. The shoring contractor doesn't know what he is doing.

 

[ajk1]

I think the post shores were put in by the general contractor, but I agree with you Hokie66 that it makes no make sense, However they are at 2 feet centres (600 mm) each way, so the load on them is quite small. Nevertheless I will bring it to his attention, so he does it better for the remainder of the shoring. I was just checking here to see if it was ever done like this when the loads are small.

 

[Triangled]

I'm in the middle of a shoring project just now...
My bottom line: if you don't like it, you'd better not accept it. The sub-contracted shoring engineering keeps sending me, sigh, half a$$ documents and calcs for review and approval, the feeling is they want me to sign off on the bare minimum they can get away with, and here I am on a forum on 4th of July weekend!!!

 

[ajk1]

ok triangled. I am having similar troubles with the shoring engineer on my project. I finally got him to double up on his bracing to the basement wall but it was a heck of a struggle and his calculations were not what any structural engineer would do...but shoring engineers are seemingly not bound by the rules for structural engineers for buildings. I had a long string on an earlier post about shoring engineers.
By the way, it is not a holiday here in Canada.