What are Texas Single Slope Concrete Barrier Type 1 Pinned Placement Specifications?

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The Texas Department of Transportation outlines specifications regarding the proper dimensions for Type 1 single slope concrete barriers with pinned placement, including general notes, section details, and more.

Texas Single Slope Concrete Barrier Type 1 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 deflection under normally expected passenger vehicle impacts. These details are intended for use in work zones, primarily on bridge decks, or pavement where temporary barrier must be placed less than 2 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 total of eight 1-3/8” ID holes formed or cord through the barrier. The center lines of the holes are shown in the whole location detail. If rebar is encountered, the entry point may be shifted to inches plus or minus longitudinally along the barrier. The eight holes are spaced along the length of the barrier as shown in detail one.

  3. The drilling of the travel service 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 SSCB (2) to standard sheet 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 pens, 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. All steel pins should be galvanized after fabrication in accordance with Item 445.

  9. The weight of barrier is approximately 700 pounds per foot.

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Texas Single Slope Concrete Barrier Type 1 Pinned Placement Details

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

Detail 1

Barriers measure 30” long and include 1-3/8” diameter holes, which are arranged in pairs along the barrier. Each hole in a pair is spaced 7” apart. The pairs of holes are spaced 6’-9” apart from each other, and 4’-3” away from either end of the barrier (when measured to the nearest hole).

Detail 2

Detail 2 depicts placement on asphalt concrete pavement (ACP) or treated base materials. In this instance, a 30” pin is required. Cross pins should be used if traffic is on both sides of the barrier and there is less than 2’-0” of slide room. The front or traffic side pin will be fit into a 1-3/8” diameter hole (typ. front and back).

Detail 3

Detail 3 depicts placement on a bridge deck or CRCP. In this instance, a 27” pin is required. Cross pins should be used if traffic is on both sides of the barrier and there is less than 2’-0” of slide room. The front or traffic side pin will be fit into a 1-3/8” diameter hole (typ. front and back). Cross pins are recommended but not required if there is less than 2’-0” on the bridge deck.

Core Drilling
Core drilling 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 bit to cut through existing reinforcing will likely be required. Spalls in the concrete exceeding ½” should be patched.

Precast SSCB 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.

There is a grout recess at the top of the barrier where the barrier bolt is placed, and a 3-1/2” x 3-1/2” recess (spread reinforcing steel at the top to clear recess by ½”).

There is a 1” diameter bolt and hex nut running vertically through the center of the barrier into the deck below (the bolt length will vary). Barriers include a 1-1/2” ID Hole (formed or cored) and a void at the bottom for conduit where applicable (with a 2” radius).

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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