View Q&A

I was ask by a construction engineer, if it O.K. to bolt the 12.5-foot temporary concrete barrier to a bridge deck that has an asphalt overlay.

Currently, our detail (see attached) does not allow this.  Why does the barrier need to rest on concrete?  If there is an asphalt overlay on the bridge deck, is there some other modification to the design that we should do?

Our concern with installation the bolt-through tie-down in asphalt is that the asphalt increases the moment arm on the bolt and the corresponding bending stresses. We have come up with a retrofit using a pipe sleeve in the asphalt and concrete that should eliminate this issue. See the attached schematic.