What are Maryland Precast Temporary 32 Inch F-Shape Concrete Barrier Pin and Loop Joint Specifications?

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The Maryland Department of Transportation outlines specifications regarding the proper dimensions for precast F-shape concrete barrier pin and loop joints, including general notes, elevation view details and plan view details.

Maryland F-Shape Barrier Pin and Loop Joint General Notes

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

  1. Reinforcements:

a. 6x6 W2.9 x W2.9 welded wire fabric folded in a U shape

b. Two No. 4 ½” diameter reinforcement bars that are Grade 60 and each 11’-4” long

  1. Concrete should be mix No. 6 (4,500 PSI)

  2. 2 -SC52 – 2 ton lifting anchors

  3. All barriers should have “T350” imprinted onto the top end of the barrier

  4. Include a 24” wide x 1-7/8” high drain pan

  5. ¾” chamfer along the top edges

  6. Connector loops should be ¾” diameter rods of ASTM 709 Grade 36

  7. Plain should conform to ASTM A 153

Maryland F-Shape Barrier Pin and Loop Joint Details

The pin and loop joints of precast concrete barriers in Maryland should conform to the following dimensions and include the following features, according to the Maryland Department of Transportation’s specifications.

Elevation View

When observing the barrier at an elevation view, the lower connector loop (on the right side) should protrude from the bottom of the barrier 2” above the ground line; the distance between the lower connector loop (right side) and the upper connector loop (right side) should be 1’-6”; the distance between the upper connector loop (right side) and the top of the barrier should be 8”. There should be a 2” lip at the bottom of the barrier, from which the lower connector loop protrudes.

When observing the barrier at an elevation view, the lower connector loop (on the left side) should protrude 4” from the ground line; the distance between the lower connector loop (left side) and the upper connector loop (left side) should be 1’-6”; the distance between the upper connector loop (left side) and the top of the barrier should be 6”.

Connector Loops

Connector loops should protrude 2-1/4” out from the barrier; each loop should have a 7/8” interior radius. The “flat side” or “face” of the loop should be facing downwards (in other words, connector loops should be positioned so that connector pins can be inserted vertically).

End View

When observing the barrier from an end view, connector loops should be horizontally centered on the barriers. When measured from the center of each loop, there should be a 1’-0” distance from the center of the loop to the outside (bottom) of the barrier.

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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