What are the New Mexico Temporary Precast Concrete Wall Barrier Specifications?

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The New Mexico Department of Transportation outlines specifications regarding the proper dimensions for temporary concrete wall barriers, including general notes, plan view details, elevation details and section details.

New Mexico Temporary Precast Concrete Wall Barrier General Notes

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

  1. All work should be in accordance with the New Mexico Department of Transportation’s Standard Specifications for Highway and Bridge Construction, Current Edition.

  2. All devices seeking department approval should conform to the following:

a. Follow the approval process defined by the Department.

b. Conform to NCHRP report 350 for crashworthiness.

  1. Concrete should be Class A concrete in accordance with Section 510 of the New Mexico State Department Standard Specifications for Highway and Bridge Construction, Current Edition.

  2. Shop drawings should be submitted prior to fabrication.

  3. The contractor should not intermix the use of concrete wall barrier designs of type 32, type 42 and temporary concrete wall barriers shown on sheet 4 of 5 of their set of standard drawings.

  4. Mandatory: 1” x 12” lifting coil with double flared loops (safe working load of 8,000 lbs.)

  5. Placement of concrete wall barriers should extend a minimum of 60 feet beyond the area of concern unless wall barriers are anchored.

  6. In order to allow for the deflection of concrete wall barriers, a clear area of at least 5 feet must be maintained behind the barrier unless anchorage is used.

  7. Consecutive lengths of temporary concrete wall barriers should always be connected by utilizing the connecting pin assembly shown on 606-20-2/5.

New Mexico Temporary Precast Concrete Wall Barrier Specifications

Concrete barriers in New Mexico should include the following features, according to the New Mexico Department of Transportation specifications.

Elevation View

Barriers include two drainage slots, which are set 3’-4” apart from each other (when measured from their centers). The left drainage slot sits 3’-4” from the left edge of the barrier, and the right drainage slot sits 3’-4” from the right end of the barrier (when measured from their centers).

There are three connection loop bars protruding from each end of the barrier (for a total of six loops in all). On the left side of the barrier, the loops are spaced as follows:

  • Distance from bottom of the barrier to the lower loop: 8”

  • Distance from the lower loop to the middle loop: 1’-2”

  • Distance from the middle loop to the highest loop: 4”

  • Distance from the highest loop to the top of the panel: 6”

On the right side of the barrier, the loops are spaced as follows:

  • Distance from bottom of the barrier to the lower loop: 6”

  • Distance from the lower loop to the middle loop: 4”

  • Distance from the middle loop to the highest loop: 1’-2”

  • Distance from the highest loop to the top of the panel: 8”

Loop bars measure ¾” in diameter.

Each barrier includes both #6 deformed bars and #3 bar cages.

Centered on the barrier is a 1” x 12” double lifting coil (see general note #6).

Plan View

Barriers measure 10’-0” long and 2’-0” high. They include a 1” typical taper at the traffic approach corners. All loops are projected 2” (typ.) from the end of the barrier.

Loop Details

When two barriers come together through the use of the loop bars, there should be a maximum gap of 2-1/4” between them and a minimum gap of 1-1/4”, which is created by the taper at the end of the barrier.

New Mexico Temporary Precast Concrete Wall Barrier Section Details

Concrete barrier sections in New Mexico should include the following features, according to the New Mexico Department of Transportation specifications.

Section A-A

Barrier widths measure 2’-0” on the bottom and 6” at the top. The v-notch measures 1’-0” wide. The vertical reveal measures 3” high. Each barrier includes a top loop bar, a 1-1/4” diameter steel bar (Grade 36), and a bottom loop bar, as well as a ¾” chamfer or radius.

Section B-B

Section B-B shows that each barrier includes ¾” diameter smooth loop bars (top), a #6 deformed bar, ¾” diameter smooth loops bars (bottom), and an anchoring slot.

Section C-C

Section C-C shows that each barrier includes slotted holes on either side of the barrier. Note that triangular space in the base of a barrier is typical, though a circular arch shape will be permitted.

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

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