What are the Maryland Approach Plates for Precast Temporary Concrete F-Shape Barrier (Left and Right Sides) Specifications?

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The Maryland Department of Transportation outlines specifications regarding the proper dimensions for approach plates for precast temporary concrete F-shape barriers, including general notes, plan view details, elevation details, plate anchorage details, and section A-A details.

Maryland Approach Plates for Precast Temporary Concrete F-Shape Barriers (Left and Right Sides), General Notes

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

  1. The approach plate should be fabricated using a ½” thick steel plate that’s bent or welded to the appropriate dimensions.

  2. Structural steel should conform to ASTM A 709 Grade 36 and galvanized after fabrication in conformance with ASTM A 123.

  3. See Standard MD 104.01-55 for details on precast temporary 32 inch F-shape concrete traffic barrier transition right side approach, and Standard MD 104.01-57 for left side approach.

  4. When the approach plate is removed, the holes in the existing barrier should be grouted.

Maryland F-Shape Barrier Approach Plate Details

Approach plates in Maryland should conform to the following dimensions and include the following features, according to the Maryland Department of Transportation’s specifications.

Plan View (Right and Left Side)

Right side plates should begin with a ½” gap between the plate and the barrier on the right side and expand to a 8-1/2” gap between the plate and the barrier on the left side. When measured from the end of the left side, there should be 2’-0” between the end of the plate and the flasher bracket hole. Flasher bracket holes should be 5/8” in diameter.

These measurements should be mirrored (inverted equally) for the left side.

Elevation View (Left and Right Side)

All plate corners should be rounded before galvanizing. Plates should include two sets of six holes that are each 1” in diameter. Holes are positioned in pairs of two, with 6” (horizontally) between each pair of holes. There should be four total holes in the bottom slope of the plate, and eight total holes in the top slope of the plate.

Approach Plate Anchorage
Approach plate anchorages should be installed in the field to achieve proper placement and hole alignment. Approach plate anchors include 6 expansion anchors with galvanized 7/8” diameter hex head bolts. (Use the same method to anchor plates to existing barriers as you would to new barriers). There should be a 2” minimum and a 2-1/2” maximum between the end of the inserted hex head bolt and the back of the temporary precast barrier transition.

Section A-A
Section A-A can be shown either bent with welded stiffener plates, or welded. The difference is that when the stiffener plate is bent, there is a 7” offset of the stiffener plate, but with the welded version, there is a 6-5/8” offset. All other measurements are equal.

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

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