Logged in as: Public User

Temporary Barrier Thrie Beam Connection

Question
State WI
Description Text

Below is an email from one of our contracting associations. 

I would like  MwRSF to review question #2.

___________________________________

2) Temporary Barrier Thrie Beam Connections
    A) 1st detail showing the use of 7/8" bolts and bolting back to back.
            AA) Problems of field drilling with rebar interference
    B) 2nd detail showing the use of 3/4" anchors and back to back Thrie
Rail Assemblies offset
    C) Why is single sided Temp. Thrie Connections not acceptable for
single side traffic
    D) Use of 3/4" Concrete Anchors

Keywords
  • Temporary Barriers
Other Keywords none
Date February 9, 2012
Attachment Temp Thrie Beam Connection.pdf
Attachment Thrie Rail Connection Plate.pdf


Response
Response

I will try to address the questions under number 2 below.

2) Temporary Thrie Beam Connections
    A) 1st detail showing the use of 7/8" bolts and bolting back to back.
            AA) Problems of field drilling with rebar interference

- There may be issues with rebar interference when through bolting the thrie beam pieces on the end of the TCB approach transition. The degree of interference will depend on the reinforcement of the barrier that is attached to. I believe that we were able to avoid interference on the PCB sections. We would allow the thrie beam to be adjusted a foot or so longitudinally along the barriers to prevent rebar interference if necessary.


    B) 2nd detail showing the use of 3/4" anchors and back to back Thrie
Rail Assemblies offset

- The offset shown is used to prevent interference of the mechanical anchors. If the ends of the thrie beam on each side are not offset, the anchors will interfere.


    C) Why is single sided Temp. Thrie Connections not acceptable for
single side traffic

- The double sided thrie beam is used even with single sided traffic to increase the stiffness of the connection between the PCB and the rigid barrier. It also serves to prevent snag, but obviously only one side of the thrie beam is effective for that. The use of both sides is primarily for stiffening of the joint.


    D) Use of 3/4" Concrete Anchors

- Not sure what the question is here. The system was tested with ¾" dia. x 6" long Powers Fasteners Wedge Bolt anchors.

 

Date February 10, 2012


Contact Us:
130 Whittier Research Center
2200 Vine Street
Lincoln, NE 68583-0853
(402) 472-0965
Email: mwrsf@unl.edu
Disclaimer:
The information contained on the Midwest Roadside Safety Facility (MwRSF) website is subject to change without prior notice. The University of Nebraska and the MwRSF is not responsible or liable, directly or indirectly, for any damage or loss caused or alleged to be caused by or in connection with the use or misuse of or reliance upon any such content, goods, or services available on this site.