What are North Carolina Portable Concrete Barrier Specifications?
The North Carolina Department of Transportation outlines general notes regarding the proper dimensions of portable concrete traffic barriers, including general notes, elevation views, plan views, section details, and more.
North Carolina Portable Concrete Barrier General Notes
The North Carolina Department of Transportation’s general notes are as follows:
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The draining/lifting slot shown on the outline (and detailed below) is a modification of the lift openings. All other design criteria (such as reinforcing bars, etc.) are the same as shown on the standard drawings.
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Barriers with drainage/lifting slots are intended to be used in areas where the roadway surface water runoff causes excess puddling adjacent to the temporary barrier. Install the barrier as shown in the plans, or as directed by the Engineer.
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Drainage slots can be used with anchored “portable concrete barriers.”
North Carolina Portable Concrete Barrier Specifications
The North Carolina Department of Transportation’s specifications for barriers are as follows:
Plan View
According to the plan view, barriers measure 10’-0” long and 2’-0” wide. They include a 1-1/4” space of clearance (typ.) between the point where the connection hook inserts into the barrier and the edge of the barrier.
Elevation View
Barriers include ¾” diameter loop bars running through the center of the barrier. The bars protrude on the left and right sides of the barriers by a distance of 2” (when measured from the face of the barrier to the outer edge of the bar).
On the right side of the barrier, there are 6” between the top of the barrier and the upper bar; 4” between the upper bar and the middle bar; and 1’-2” between the middle bar and lower bar.
On the left side of the barrier, there are 8” between the top of the barrier and the upper bar; 1’-2” between the upper bar and the middle bar; and 4” between the middle bar and lower bar.
End View A-A
Barriers measure 2’-0” wide at the bottom and 4” wide at the top. They have a RAD. Of 10” and a ¾” chamfer or radius on all corners. The vertical reveal is 3”. The lower slope is 10” tall 7” wide. The upper slope is 1’-7” tall.
Section B-B
Section B-B depicts a welded wire fabric running through the center of the barrier which is labeled “6 x 6 W2.9 x W2.9.” There is a #4 bar attached to the fabric with approved wire ties. All ¾” diameter loops running through the center of the bar are attached to fabric.
Elevation Details of Drainage and Lift Slots
From an elevation view, the drainage slot measures 3” tall and 3’-4” wide. The image shows crosshatching to denote an open area at the bottom of the barrier, which allows for drainage.
This blog post is an interpretation of specifications by the North Carolina Department of Transportation. Please consult with NCDot's most recent requirements for definitive information.
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