View Q&A

I was reviewing MwRSF's detail for the temporary barrier tie-down strap.  I have a question about a plate installed near the bottom of the connection pin (see attached drawings).

How is this plate installed?  If it is welded to the connection pin, I don't think the connecting pin can be installed.  I don't think that the plate can be installed after the tie-down strap and the barriers are installed ( not enough room to work).

Looking at Iowa's concrete barrier detail, they don't show the plate on the connection pin.

If the plate is needed what is its' purpose?  I don't believe that it is needed for the double shear connection (i.e. the double shear is provided by the second set of loops).

Any information you can provide would be greatly appreciated. 

The plate on the bottom of the connection pin is not welded. It slides onto the bottom of the connection pin and is held in place by the bolt.

In order to install it with the strap tie-down, you have to lift the strap up, put the plate and bolt on the connection pin, and then lower the strap back down. The strap can then be bolted to the drop-in anchors or secured with wedge bolts.

The system was tested with the bolt and plate in place. Because this system relies on loading of the connection pin to restrain the barrier, we believe that the retention plate and bolt are necessary to prevent the pin from pulling out of the loops. I don't believe that the bolt has sufficient capacity to prevent the pullout of the pin under high loads. Thus, the plate is likely necessary.