What are Michigan Temporary Concrete Barrier Specifications: Type J1 and J2?

The Michigan Department of Transportation outlines specifications regarding the proper dimensions for temporary concrete barriers with limited deflection (type J1 and J2), including general notes, plan view details, elevation details, and more.

Michigan Temporary Concrete Barrier General Notes

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

1. Do not lift or move the TCB sections by use of the connecting loop bars D1, D2, D3 or D4. Do not apply excessive force to these connecting loop bars.

2. Concrete clear cover for reinforcing bars must be 1-1/2” (min.) except where otherwise specified.

3. Lifting slots should be constructed as specified to facilitate the drainage of water after installation on the roadway.

Michigan Temporary Concrete Barrier Specifications

Michigan temporary precast concrete barriers should conform to the following specifications, according to the Michigan Department of Transportation:

Plan View, Type J1

Barriers measure 12’-6” long and 1’-10-1/2” wide. They include holes for stakes, anchor bolts or rods (to secure the barrier to the ground). These holes are 2” in diameter (typ.) and are spaced symmetrically along the barrier in pairs (for every hole on the left side, there is an identical hole on the right side).

The first pair of holes is set 2’-0” from the left edge of the barrier; the second pair of holes is set 4’-3” away from the first set of holes; the third set of holes is set 4’-3” away from the second set of holes (moving from left to right).

Each barrier includes 1” diameter (8-NC) loop ferrules on the right side of the barrier. Barriers include A1 Bar, A2 Bars (in pairs), and B1 Bars.

Plan View, Type J2

J2 barriers are like J1 barriers, except they are inverted.

J2 barriers measure 12’-6” long and 1’-10-1/2” wide. They include holes for stakes, anchor bolts or rods (to secure the barrier to the ground). These holes are 2” in diameter (typ.) and are spaced symmetrically along the barrier in pairs (for every hole on the left side, there is an identical hole on the right side).

The first pair of holes is set 2’-0” from the right edge of the barrier; the second pair of holes is set 4’-3” away from the first set of holes; the third set of holes is set 4’-3” away from the second set of holes (moving from right to left).

Each barrier includes 1” diameter (8-NC) loop ferrules on the left side of the barrier. Barriers include A1 Bar, A2 Bars (in pairs), and B1 Bars.

Elevation View, Type J1 and J2

J1 barriers include 4” diameter lifting holes with an 11 gauge steel round mechanical tubing sleeve. (Lifting holes are optional). The barriers also include a 4” diameter x 12’-6” galvanized pipe running through the center of the barrier.

Barriers include two lifting slots, which are each 1’-0” long and 3” deep. The lifting slots are spaced 2’-0” apart from each other and are centered on the barrier.

On the right side of the barrier, there are loop ferrules (typ.) and a cap plate recess. Barriers include A1 Bars, A2 Bars, and D4 Bars.

J2 barriers are identical to J1 barriers, except their measurements are flipped. For example, the loop ferrules are on the left side of the barrier as opposed to the right side.

Section C-C, Type J1 and J2

Section C-C shows a 4” diameter galvanized pipe running through the center of the barrier. Above and below the pipe are 2” diameter dowel bar holes (typ.). There is a 5/8” recess (typ.), a ¾” weld or bend (typ.) on the barrier edge, and a 1/8” CL. to cap plate within the barrier. Barriers include a 1-1/8” minimum CL. to reinforcement, and a ½” x 36” x 48” steel cap plate (galvanized).

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

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