What are the Texas Precast Concrete Traffic Barrier (F-Shape) Pinned Placement Specifications?

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The Texas Department of Transportation (TxDOT) outlines specifications regarding the proper pinned placement for precast concrete traffic barriers F-Shape, Type 1 (PCTB), including general notes, pin details, side view details, and more.

Texas Precast Concrete Traffic Barrier (PCTB) Precast Pinned Placement General Notes

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

  1. These details provide a method of laterally restraining precast concrete barrier to limit deflections under normally expected passenger vehicle impacts. These details are intended for use in work zones, primarily on bridge decks or pavement where temporary barriers must be placed less than two feet from the longitudinal edge of the deck or drop off and parallel to the direction of travel. Other applications of these details are acceptable as directed by the Engineer.

  2. Each precast concrete barrier section should have a minimum of four or a total of eight 1/38” diameter holes formed or cored through the barrier. The center lines of the holes are shown in the hole location detail. If rebar is encountered, the entry point may be shifted 2” plus or minus longitudinally along the barrier. The eight holes are spaced along the length of the barrier as described in Detail 1.

  3. The drilling of the travel surface is accomplished by placing the pre-drilled barrier section on the travel surface in the desired position. Then the hole is drilled with the bit passing through the hole in the barrier. The bit is to be inserted into the hole in the barrier so that the travel surface is drilled to a point which is slightly more than the pin length.

  4. Note that steel washers have been welded to the top of the steel pins to aid in the removal of the pins, when the barrier is removed.

  5. See CSB standard sheets for reinforcement requirements and joint connection types.

  6. The forming or coring of holes in the barrier, drilling of holes in bridge deck or pavement, fabrication and materials for the 1-1/4” pins, installation of pins, and any repair to the barrier should be considered as subsidiary to the barrier bid items.

  7. The barrier and travel surface will be repaired as directed by the Engineer in accordance with Item 429, “Concrete Structure Repair.”

  8. Provide galvanized bolts, nuts and plate washers. All steel pins should be galvanized after fabrication in accordance with Item 445, “Galvanizing.”

  9. Weight of barrier is approximately 440 pounds per foot.

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Texas Precast Concrete Traffic Barrier (PCTB) Pinned Placement

Texas PCTB pinned placement should conform to the following specifications, according to the Texas Department of Transportation:

Detail 1

Barriers include front and back holes that measure 1-3/8” in diameter. These holes are meant for side pins or bolt throughs, and they are spaced as follows:

  1. Front Holes

The first front hole is spaced 4’-10” from the left side of the barrier; the next three holes are then spaced in even intervals of 6’-9”.

  1. Back Holes

The first back hole is spaced 4’-3” from the left side of the barrier; the next three holes are then spaced in even intervals of 6’-9”.

Detail 2

Detail two shows placement on Asphalt Concrete Pavement or treaded pace material. A cross pin of 30” is required if traffic is on both sides of the barrier and there is less than 2’-0” of slide room. The pins will fit into a 1-3/8” diameter hole (typ., front and back). Front or traffic side pin is required with this pinned placement.

30” Pin Detail

Pins should be made of ASTM A36 steel and measure 30” long and 1-1/4” in diameter. A steel washer should be welded to the pin at a 5 degree angle so that the washer is flush to the barrier surface.

Detail 3

Detail three shows placement on a bridge deck or CRCP. Cross pins of 21” are required if traffic is on both sides of the barrier and there is less than 2’-0” of slide room. Cross pins are recommended but not required if there is less than 2’-0” on the bridge deck. The pins will fit into a 1-3/8” diameter hole (typ., front and back). Front or traffic side pin is required with this pinned placement.

21” Pin Detail

Pins should be made of ASTM A36 steel and measure 20-1/2” long and 1-1/4” in diameter. A steel washer should be welded to the pin at a 5-degree angle so that the washer is flush to the barrier surface.

Core Drilling an Existing Barrier

Core drilling an existing concrete barrier is permitted. Holes should be drilled with coring or masonry drilling type equipment. Percussion drilling should not be used. A special drill but will likely be required. Spalls in the concrete exceeding ½” should be patched.

Precast Concrete Traffic Barrier Bolt Through Placement Over Longitudinal Expansion Joint

The “bolt through” method of pinning precast barriers on a bridge deck is primarily used in a permanent location that requires limited barrier deflection.

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

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