What are the Colorado Precast Type 7 Concrete Barrier with Pin and Loop Connection Specifications?

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The Colorado Department of Transportation outlines specifications regarding the proper dimensions for precast type 7 barrier pins and loops, including general notes, elevation view details, joint style details, and more.

Colorado Precast Type 7 Concrete Barrier Pin and Loop General Notes

  1. Washers should be forged as an integral part of the pin, or should be welded as described below.

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

  3. If an alternative top configuration is used for lifting, the lifting pin should be provided. Pins should conform to critical dimensions (pin length diameter).

  4. Pins should conform to ASTM A449.

  5. Approved non-shrink grout should be used for grouting over all pins, and grouting of scuppers.

  6. Joints between cast in place guardrail type 7 and permanent installation precast type 7 concrete barriers should include all regresses and loops in the cast in place end, along with the pin to complete the typical precast type 7 concrete barrier joint.

Colorado Precast Type 7 Concrete Barrier Pin and Loop Plan Details

Plan View Details
According to the Colorado Department of Transportation plan view details, precast type 7 concrete barrier pins and loops should include the following features and conform to the following dimensions:

  • Clearance between panels: ½”

  • ¼” chamfer

  • Two ¾” diameter loop bars running horizontally through the center of each panel

  • Two pinning assembly configurations in each panel that will mirror each other when the panels are joined together.

Connecting Pin Details

Connecting pins should be 30” long plus or minus 1/8”. The threading is not included in this number; threading should be 1-1/2” long. There should be a 2” or 2-1/4” diameter circular washer (with a 1/8” minimum thickness) set onto the threading, which should rest where the threading ends and the bar begins. Pins should be 1” in diameter. The bottom ½” of the pin may be beveled to facilitate placement.

Alternative Pin Details

According to the Colorado Department of Transportation alternative pin details, pins should be 1” in diameter and hot-dipped galvanized after fabrication. Pins should be 30” long below the washer (plus or minus 1/8”) and 1” high above the washer. Washers should be 1/8” thick.

Colorado Precast Type 7 Concrete Barrier Pin and Loop Elevation Details

According to the Colorado Department of Transportation elevation view details, where two panels are joined together, there should be a connecting pin that is “shown partially in place,” which is protruding from the top of the spot where the panels join. Furthermore, there should be “grout over the connecting pin.”

Colorado Precast Type 7 Concrete Barrier Pin and Loop Joint Style Details

  1. A 1” x 12” taper is required at the bottom of all four corners of the barrier sections to eliminate snagging of snowplow blades. The taper is optional on permanent installations.

  2. The horizontal slots should be 1-1/2” in depth at the center of the barrier and may decrease in depth at the edge of the barrier due to the 24:1 taper.

  3. There should be a 2-1/2” diameter x 2” vertical recess for the top of the connecting pin.

  4. There should be a 1-1/2” horizontal x 2” high horizontal slot for loop from the other barrier section.

  5. There should be a 1-1/2” maximum diameter central slot to receive connecting pins.

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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