What are the Texas Type 1 F-Shape Precast Concrete Traffic Barrier (PCTB) Specifications?

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The Texas Department of Transportation outlines specifications regarding the proper dimensions for Type 1 F-shape precast concrete traffic barriers (PCTB), including general notes, plan view details, bar details, and more.

Texas Type 1 F-Shape Precast Concrete Traffic Barrier (PCTB) General Notes

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

  1. Concrete should be Class H with a minimum compressive strength of 3,000 psi.

  2. Where used, rebar reinforcement should be Grade 60 and conform to ASTM A615.

  3. Precast barrier length should be 30 feet, unless otherwise specified.

  4. All precast barrier edges should have a ¾” chamfer or tooled radius.

  5. All concrete, reinforcement, joint connection systems, grout, etc. as shown, are considered as part of the barrier payment.

  6. All steel assemblies for joint should be galvanized after fabrication in accordance with Item 445, “Galvanizing.”

  7. Regardless of the method of handling, barrier lifting points should be approximately 7.5 feet from the ends of the barrier. Lifting devices and attachments to barrier sections should be approved by the Engineer.

  8. Surface finishing and grouting should be two parts sand and one part cement with enough water to make the mixture plastic. Grouting should be done in a manner that will assure a smooth surface. Surface finishing should be considered subsidiary to the various bid items involved.

  9. Conduit trough when required should be shown elsewhere on the plans, or as directed by the Engineer.

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Texas Type 1 F-Shape Precast Concrete Traffic Barrier (PCTB) Specifications

Texas PCTBs should conform to the following specifications, according to the Texas Department of Transportation.

Reinforcements for Precast Concrete Safety Barrier (Type 1)

Barriers measure 30’-0” (plus or minus 1”) long. Each barrier includes #4 S1 Bars with type X joint connection, #4 S3 Bars, and #5 R Bars. The S1 Bars are required with a WWR reinforcement option. There is a max spacing of 12” between the #4 S3 Bars.

Barriers also include 2” diameter lifting pipe holes which can fit steel pipe or Sch. 40 PVC. As mentioned in note 4, Regardless of the method of handling, barrier lifting points should be approximately 7.5 feet from the ends of the barrier. Lifting devices and attachments to barrier sections should be approved by the Engineer.

In addition to the reinforcing bars, barriers are required to include two drainage slots that measure 36” long x 3” deep, beginning 6’-0” from each end of the 30’-0” barrier segment.

End View for Precast Concrete Safety Barrier (Type 1)

When viewed from an end view, barriers measure 32” tall and include a ¾” chamfer (typ.) on the top and sides. There are two lifting pipe holes which are stacked vertically over each other and spaced 6” apart. The distance from the top of the barrier to the center of the upper hole is 11”, and the distance from the bottom of the barrier to the center of the bottom hole is 15”.

Barriers measure 9-1/2” wide at the top and 24” wide at the bottom. The break point occurs 10” from the ground line. The bottom slope is 7” tall and 4-3/4” wide; the upper slope is 22” tall and 2-1/2” wide. There is a conduit trough running through the center of the barrier, which is 6” wide and 3” tall. There is a 3” or 4” vertical reveal and a 1” ACP. However, it should be noted that when the 1” ACP is not used as lateral support for permanent barrier placement, a permissible method of attaining the equivalent lateral support may be used. Similarly, when the 1” ACP is not used for lateral supports, the height of the vertical reveal should be adjusted accordingly.

#4 S3 Bar Details

S3 Bars (#4) are U-shaped and measure 6” on the short “closed” end and 1’-7” on the wide “open” end. The bar is symmetrical in nature and measures 2’-3” long. Each symmetrical arm of the bar can be split into two “sections” – the long section and the short section. The long section measures 1’-9-1/4” long and the short section measures 5-3/4” long. On the closed section of the bar, there is a 2” diameter bending pin (typ.).

#2 S1 Bar (Joint Type X) Details

S1 Bars (#2) are vase-shaped and measure 6” on the short “closed” end and 10-5/8” on the wide “open” end. The bar is symmetrical in nature and measures 1’-9” long. Each symmetrical arm of the bar can be split into two “sections” – the long section and the short section. The long section measures 1’-4” long and the short section measures 5” long.

Deformed Bar Anchor Details

Bars are #5 Reinforcing Bar Grade 60 and measure 3’-8” in length. Two bars are required per assembly, and eight are required per joint. The arm of the bar is angled at 70 degrees.

Upper Connection Pipe Details

One steel pipe is required per upper assembly, and two are required per joint. Pipes should measure 1—11/16” long.

Lower Connection Pipe Details

One steel pipe is required per upper assembly, and two are required per joint. Pipes should measure 12-1/2” wide and be 1-1/2” std. pipe.

This blog post is an interpretation of specifications by the Texas Department of Transportation (TxDOT). Please consult with TxDOT' most recent requirements for definitive information.

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