What are Michigan Temporary Concrete Barrier Specifications for Type L?

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

The difference between Type J1/J2 and Type L barriers is that J1 and J2 must be used together as a pair (since they are not symmetrical), but Type L can stand alone (since it is symmetrical). The difference between Type S and Type L barriers is that Type L is nearly twice as large, with additional features to accommodate the added size.

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

Plan View, Type L

Type L temporary concrete barriers measure 20’-0” 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). There are five pairs of holes total, or ten total holes.

The first pair of holes is set 2’-0” from the left edge of the barrier; the second pair of holes is set 4’-0” away from the first set of holes; the third set of holes is set 4’-0” away from the second set of holes; this spacing continues at even intervals for the fourth and fifth set of holes. The final (fifth) set of holes is spaced 2’-0” from the right side of the barrier, ensuring that the barrier is symmetrical.

Barriers include A1 Bar, A2 Bars (in pairs), and B1 Bars. They include a loop bar on both sides of the barrier, which are symmetrical in nature.

Elevation View, Type L

Type L temporary concrete barriers include 4” diameter lifting holes with an 11 gauge steel round mechanical tubing sleeve. (Lifting holes are optional). 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. Additional lifting slots may be installed at the Contractor’s opinion, provided the additional slots do not interfere with anchor blockouts or steel reinforcement in the temporary concrete barrier section.

There are anchor blockouts on both sides of the barrier.

Barriers include A1 bars, A2 bars, D1 bars, D2 bars, D3 bars and D4 bars.
On the right side of the barrier, the bars protrude from the edge of the barrier and are spaced as follows: D1 bar is spaced 6” from the top of the barrier; D2 bar is spaced 3” below D1 bar; D3 bar is spaced 1’-5” below D2 bar.

On the left side of the barrier, the bars protrude from the edge of the barrier and are spaced as follows: D3 bar is spaced 7-1/2” from the top of the barrier; D2 bar is spaced 1’-5” below D3 bar; D1 bar is spaced 3” below D2 bar.

End View, Type L

Type L temporary concrete barriers measure 1’-10-1/2” wide at the bottom, 8” wide at the top, and stand 2’-8” tall. They are symmetrical in nature and include a 7” v-notch that is centered on the barrier (optional). Barriers include an optional 4” diameter lifting hole, which is set 10” from the groundline. Barriers include blockouts for stakes, anchor bolts or rods to secure the barrier to the roadway. Loop assemblies (typ.) are centered on the barrier. The bottom slope is 7” tall. The upper slope is 1’-10” tall.

Section A-A, Type L

Type L temporary concrete barriers have B1 bars running down their lengths, which are installed in pairs (for every bar on the left side of the barrier, there is an identical bar on the right side of the barrier). This excludes the bar at the very top of the barrier, which stands alone. B1 bars are spaced as follows: the first pair are spaced 6-1/2” over the groundline; the second pair are spaced 8” over the first pair; the third pair are spaced 8” over the second pair; the final top bar is spaced 6-5/8” over the third pair.

There is a minimum 1-3/4” clearance between the A1 bar and the outer edge of the barrier, and a 2” clearance for A2 bars.

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

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