What are Texas Precast Concrete Traffic Barrier (PCTB) Type 4 Specifications?
The Texas Department of Transportation outlines specifications regarding the proper dimensions for F-Shape precast concrete traffic barriers, (Type 4, 10 foot segments), including general notes, elevation view details, joint connection details, and more.
Texas Precast Concrete Traffic Barrier (PCTB) Type 4 General Notes
The Texas Department of Transportation’s general instructions are as follows:
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The 10 foot barrier is intended for maintenance applications of short duration periods. The 10 foot barrier is limited to use in temporary work zone conditions not to exceed two calendar months, unless approved in writing by the TxDOT Engineer, noting the duration and location of the barrier placement in the written approval.
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30 foot Type 1 barrier and 10 foot Type 4 barrier sections should not be mixed in a single run of barrier.
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Barrier lengths other than 10 feet for Type 4 barriers are not allowed.
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Concrete should be Class H, with a minimum compressive strength of 3,600 psi.
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Where used, rebar reinforcement should be Grade 60 and conform to ASTM A615.
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Only the Type X joint connection system is to be used with Type 4 barrier and is considered subsidiary. See CSB (1), Sheet 1 of 2, for Type X connection details.
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Conduit troughs may be omitted, as shown elsewhere or as directed by the Engineer.
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Usage of the 10 foot Type 4 CBS barrier requires a minimum of 100 linear feet. Shorter lengths than this should be discussed with the design division.
Texas Precast Concrete Traffic Barrier (PCTB) Type 4 Details
Texas PCTB Type 4 should conform to the following specifications, according to the Texas Department of Transportation.
Elevation View
PCTBs measure 10’ long, plus or minus 1”. Each barrier requires (#4) S1 bars (2) with Type X Joint connection, and S1 bars are required with WWR reinforcement option. Each barrier segment includes two lifting slots that are 24” long x 3” deep. The lifting slots are spaced 3’-0” apart from each other, and 1’-6” from each end of the barrier. Barriers include #4 S3 bars (17) and a 2” cover at each barrier end.
End View
PCTBs measure 24” wide at the bottom and 9-1/2” wide at the top. They stand 32” tall. All precast barrier edges should have a ¾” chamfer or tooled radius. There is a 6” conduit trough centered on the barrier running through its center, a 3” vertical reveal and a 1” ACP. When 1” ACP is not used for lateral support, the barrier’s dimensions should be adjusted accordingly. Barriers have a 10” R. The height of the lower slope is 7” and the height of the upper slope is 22”.
S1 Bar (#2) 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.
S3 (#4) Bar Details
S3 Bars (#4) are U-shaped and measure 6” on the short “closed” end and 1’-5-1/4” on the wide “open” end. The bar is symmetrical in nature and measures 2’-2” 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 4-3/4” long. On the closed section of the bar, there is a 2” diameter bending pin (typ.).
Schedule of Reinforcement for 10 Foot Precast Sections
Two S1 bars are required with the use of WWR reinforcement options. The S1 bars may need a slight modification to fit within the WWR cage, as directed by the Engineer.
Joint Connection Type X
Joint Type X Connection is required with 10 foot barrier lengths.
Type X Joint installation includes one upper connection and one lower connection. Each connection is made with a 7/8” diameter x 29” long A325 threaded rod. There is a plate washer and nut on each end.
The table below shows the approximate per L.F. quantities:
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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