What are the Colorado Precast Type 7 Concrete Barrier Stabilization Specifications?

The Colorado Department of Transportation outlines specifications regarding the details for the stabilization of permanent or temporary pinned precast type 7 concrete barriers, including general notes, a plan view of S bar ends, an elevation view with stabilization pin details, and stabilization pin details.

Colorado Precast Type 7 Concrete Barrier Stabilization General Notes

1. Pins should be hot-dipped galvanized after fabrication.

2. For terminal anchoring of the permanent installation of precast type 7 concrete barrier, refer to the end anchorage detail on standard plan M-606-13, sheet 1, which is provided by the Colorado Department of Transportation.

3. An optional 3 inch maximum tapered end point may be included on the stabilization pin to facilitate driving.

Colorado Precast Type 7 Concrete Barrier Plan View of S Bar Ends

According to the Colorado Department of Transportation plan view of S bar ends, precast type 7 concrete barriers should include the following features and conform to the following dimensions:

• One #4 S bar included at each barrier end

• 12” between the end of the barrier and the center loops of the S bars

• S bar loops (when measured from the outside of the looped ends) should be 2-1/2” long (typ.) and 1-1/2” in diameter

• S bars should be 16-1/4” long when measured in total from end to end; each outer leg should be 12-1/2” long

• The barrier should include a 12:1 taper (typ.) at each S bar end

Colorado Precast Type 7 Concrete Barrier Elevation View with Pins

According to the Colorado Department of Transportation elevation view with pins, precast type 7 concrete barriers should include the following features and conform to the following dimensions:

• Length: 13-1/2”

• Distance between ground line and first #4 S bar: 4”

• Width between the end of the S bar and the side of the barrier: 4-3/4”

• Diameter of bars: 1” (typ.)

• Recess to be 3” width (typ.)

• Fill recess with grout after placing pin

• A stabilization pin is required through the barrier surfacing into the subgrade. Drilled holes are required for concrete pavement. Use two pins for each end in each unit.

• Form a hole for the pin with 1-1/2” O.D. PVC plastic pipe (which is to be left in place)

Colorado Precast Type 7 Concrete Barrier Stabilization Pin Details

According to the Colorado Department of Transportation stabilization pin details, precast type 7 concrete barrier stabilization pins should include the following features:

Stabilization Pin

This description is for ASTM A 36 steel pins.

Pins should include a 2-1/2” diameter plate that is 3/8” thick. The plate should be placed 3/8” from the top of the pin. The diameter of the pin should be 1” and should be hot-dipped galvanized after fabrication. The pin length will vary based on the road surface, as described in the table below.

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

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