What are the Oregon Precast Single Slope Concrete Barrier Specifications?

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The Oregon Department of Transportation outlines specifications regarding the proper dimensions for concrete barriers, including general notes, plan view details, elevation details, end view details and more.

Oregon Precast Single Slope Concrete Barrier General Notes

The Oregon Department of Transportation’s general instructions are as follows:

  1. All reinforcing steel should conform to ASTM A706 or AASHTO M31 (ASTM A615) grade 420. All bars should be full length as shown and should be placed 1-1/2” clear of the nearest face of concrete, unless shown otherwise.

  2. All structural steel (including fasteners) should be hot-dip galvanized after fabrication.

  3. Normal use of precast single slope median barrier is restricted to curves with radii greater than 820’.

  4. Chamfer all edges ¾” (typical).

  5. Perforated C-shape should be place in locations shown to a tolerance of 1/16”.

  6. Estimated barrier weight is 6,900 lbs. unit length. Estimated vertical backed barrier weight is 5,500 lbs.

Oregon Precast Single Slope Concrete Barrier Specifications

Oregon barriers should conform to the following specifications according to the Oregon Department of Transportation:

Elevation View

Barriers measure 9’-10” long and 42” high. They have a 9’-11” laying length from the center of the joint to the center of the joint. Each barrier includes seven #4 longitudinal bars (on each face). Barriers also include two 5” x 8” scuppers (but only when called for in the plans). Lower longitudinal bars should be stopped with a 1” clearance of the scupper.

Barriers include a 1-1/2” diameter standard pipe (A53, grade A or B) for lifting. Barriers also include two lifting slots, which are spaced 3’-4-1/4” from the edge of the barrier to the closest edge of each lifting slot.

Plan View

The Oregon Department of Transportation plan view outlines the proper connection between two barriers. It’s noted that there should be a distance of 12” between the center of the loop and the edge of the barrier. Loop holes measure 1” rad. (typ.) and 2” rad (typ.).

Typical Section

A typical barrier section includes #4 stirrups, which measure 12” in length (horizontally) at the bottom, 3’-0” in length on the long vertical, 4” in length horizontally at the top, and 6” in length on the short vertical.
There are fourteen #4 x 9’-6” (as shown on the plans); two #4 stirrups (see elevation view for spacing), and a scupper when required.

The base of a barrier measures 2’ wide at the bottom and 8” wide at the top. Barriers are 3’-6” tall, with a 6” v-notch and a 3” clearance between the bottom of the stirrup and the bottom of the barrier.

End View A-A and B-B

When observing end view A-A and B-B, barriers include a 2” radius blockout for a bolt at the top (on both ends); 1-1/2” diameter standard pipes (ASTM A53 grade A or B) for lifting; 1” radius blockout for a bolt at the bottom (on both ends); one U1 bar at the top (for each end); one U2 bar in the center (for each end), and one U3 bar at the bottom (for each end).

Fillet weld caged nut to the bottom of perforated C-shape.

Oregon Precast Single Slope Concrete Barrier Details

Oregon barriers should conform to the following specifications according to the Oregon Department of Transportation:

Bolt Details

Barrier ends bolts should measure 2’-6” long, 1” wide, with a 3” threaded end that tapers to ½” wide.

U-Bar Detail

U-bars should conform to the following widths:

  • U1 = 8”

  • U2 = 10”

  • U3 = 12-1/2”

Perforated C-Shape

Cut from a 5/16” thick steel plate or bar (AASHTO M183, ASTM A36). Hot dip galvanize after fabrication. (See general note #5 for casting instructions).

Narrow Base Barrier

Narrow base barriers should only be used against retaining walls or as directed.

This blog post is an interpretation of specifications by the Oregon Department of Transportation. Please consult with Oregon DOT's most recent requirements for definitive information.

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