What are Illinois Temporary Concrete Barrier Specifications?

Tips & Advice

The Illinois Department of Transportation outlines specifications regarding the proper dimensions of concrete F-shape barrier walls, including the correct connecting loop bar design, s1 and alternate s1 designs, reflector placement, and reinforcement bar placements.

Illinois F-Shape Barrier General Notes

Concrete barriers in Illinois should conform to the F-shape design. Each F-shape barrier should be clearly marked with “ILLINOIS F SHAPE,” the Producer’s mark and the date of manufacture. The markings should be indented or painted on the barrier with waterproof paint or ink.

The insert for the ½ (M12) bolt should be capable of 3,000 pounds (13 kN) of pull-out strength.

When the barrier separates opposing flows of traffic, markers should be placed on both sides of the barrier panel.

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Illinois Temporary Concrete Barrier F-Shape Design

Each F-shape barrier panel should be 12’-6” (3.8 m) long and include:

  • One center insert with a galvanized ½” (M12) bolt and washer

  • Two lifting slots that are 18” (455 mm) in length, placed 45” (1,145 mm) from each end of the panel

  • ¾” (19 mm) diameter connecting loop bars

  • One loop bar that is located 8” (200 mm) from the bottom of the panel at both ends

  • One loop bar that is located 10” (250 mm) from the top of the panel at both ends

  • One loop bar that is located 6” (150 mm) from the top of the panel at both ends

  • 1-1/2 (38 mm) diameter handling hole set 13” (330 mm) from the bottom at each end of the panel (optional)

  • 1” (25 mm) chamfer on all edges (optional)

Illinois Temporary Concrete Barrier F-Shape Connecting Loop Bar Design

Each connecting loop bar should be ¾” (19 mm) in diameter and 39” (990 mm) long. Additionally, the pivoting end section should be 6” (150 mm) long and rotate at a 45 degree angle.

There should be 3-1/2” (88 mm) plus or minus ¼” (6 mm) of space between the two ends of each connecting loop bar. There should be 2-1/2” (63 mm) of space between the face of the panel and the end of the loop bar.

Illinois F-Shape S1 and Alternate S1 Design

F-shape barrier walls may conform to one of two different designs: the s1 bar or the alternate s1 bar.

S1 Bar Specifications:

Height: 28” (711 mm)

Width: 19” (483 mm)

Height of lower slope: 9” (229 mm)

Height of upper slope: 20-3/4” (527 mm)

Length from bottom center to bottom edge: 8-1/2” (216 mm)

Alternate S1 Bar Specifications:

Height: 28” (711 mm)

Width: 19” (483 mm)

Height of lower slope: 9” (229 mm)

Height of upper slope: 20-3/4” (527 mm)

Length from bottom center to bottom edge: 4” (102 mm)

Illinois F-Shape Barrier Wall Reflectors

Each barrier should include four Type C reflectors (TYP.), facing the traffic, located 12” (300 mm) from the top of the panel, and spaced 25’ (17.6 m) apart.

Illinois F-Shape Barrier Reinforcement Bar Specifications

Each barrier should include the following reinforcement bars:

  • Horizontal No. 5 (No. 16) h1 bar, located near the top of the panel

  • Horizontal No. 4 (No. 13) h2 bar, spaced 12-1/8” (308 mm) below the No. 5 bar

  • Horizontal No. 5 (No. 16) h1 bar, spaced 9” (229 mm) below the No. 4 (No. 13) h2 bar

  • Horizontal No. 4 (No. 13) s1 bar, set between upper the No. 5 h1 bar and the No. 4 h2 bar.

  • Vertical No. 6 (No. 19) s2 bars, 8-3/4” (222 mm) long, set 7-3/4” (197 mm) from each end of the panel

  • Vertical No. 6 (No. 19) s2 bars, set between the lifting slots

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

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