What are Texas Low Profile Precast Concrete Barrier (Type 1) Specifications?

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

Texas Low Profile Precast Concrete Barrier (Type 1) General Notes

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

  1. Low Profile Concrete Barrier (LPCB) is approved for use in temporary work zone locations where the posted speed is 45 mph or less.

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

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

  4. Precast LPCB length should be 20 feet.

  5. All barriers should have a ¾” chamfer or a tooled radius.

  6. Join connection hardware should be in accordance with Item 449, “Anchor Bolts” and is considered subsidiary.

  7. Steel pipe required for joint connection bolts should be galvanized in accordance with Item 445, “Galvanizing.”

  8. Welded wire reinforcement (WWR) may be used in lieu of conventional reinforcement for Type 1 barrier, and should be the requirements shown.

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Texas Low Profile Precast Concrete Barrier (Type 1) Specifications

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

Plan View

Type 1 barriers are symmetrical about the center lines. They measure 20’-0” long and 28” wide, and include a 1-1/4” PVC drainpipe hole, plus a trough for bolt joint connections. The connection trough measures 30” long and begins 10” from the left side of the barrier. Steel pipe is required for all joint connections. Barriers include H2 Bars, V1 Bars and H1 Bars for reinforcement.

Elevation View

Each barrier includes a drain slot that is no taller than 2”. Galvanized steel pipes are required for all joint connections. There are 2” nominal diameter lifting pipes made of steel or Sch. 40 PVC spaced approximately 4’-0” from each barrier end. Barriers stand 20” tall.

H2 (#5) Bars

Each barrier includes eight H2 Bars. This is a U-shaped bar. Each arm of the bar measures 41” long, the open end of the bar measures 22-1/2” wide, and there is a 6” diameter bending pin on both corners.

V1 (#4) Bars

Each barrier includes 17 V1 Bars. This rebar is a square shaped rebar with one unconnected, overlapping corner. The rebar measures 21” long and 13-1/2” wide. The overlapping ends measure 5” each.

V2 (#4) Bars

Each barrier includes 12 V2 Bars. This rebar is a U-shaped rebar with three sides, plus one open end. The bottom of the U measures 21” long, and each arm of the U measures 13-1/2” long. The open end of the rebar measures 12” across. The ends of each arm of the U is bent, and this bent section measures 4-1/2” and 10-1/4”.

Section A-A

Section A-A of the Type 1 LPCB measures 28” across on the top and is symmetrical along the center line. There are two vertically stacked 1-1/2” nominal diameter holes that are required for steel pipe connection bolts. These two holes are spaced 9” apart. There is also a 2” cover at the top of the barrier.

Section B-B

Section B-B of the Type 1 LPCB measures 28” across at the top and 26” across at the bottom. The section stands 20” tall. There is a 2” cover at the top and the sides of the section, and a 4” cover at the bottom.

ASTM A36 Connection Bolts and Plate Washer

Nuts, hex nuts and washers should all be galvanized.

Connection bolts measure 26” long. They are 1-1/4” in diameter and include a thread that is a minimum of 4” long. Hex nuts are Grade 5. The plate washer measures 5” x 10” x 3/8” and includes two holes, through which the connection bolts will be secured.

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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