What are the Maine Concrete Transition Barrier Specifications?

Tips & Advice

The Maine Department of Transportation outlines specifications regarding the proper dimensions for concrete transition barriers, including general notes, plan view details, elevation details, and more.

Maine Permanent Concrete Barrier General Notes

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

  1. All work and materials should conform to the provisions of Standard Specifications Section 526 - Concrete Barrier.

  2. The Contractor is responsible for ensuring that vertical reinforcing bars TB651 and TB652 are installed prior to placement of the curb or sidewalk concrete. Payment for these bars will be considered incidental to Item No. 526.34, Permanent Concrete Transition Barrier.

  3. Reinforcing steel should have a minimum concrete cover of 2 inches.

  4. Quantities of reinforcing bars shown are for one transition barrier only.

  5. When the Concrete Transition Barrier is cantilevered over an expansion joint, the nose should be blocked out as shown.

  6. Payment for guardrail anchorage will be considered incidental to the transition barrier pay item. Class 8.8.3 bolts should be used when corrosion-resistant steel guardrail is specified on the approach roadway.

  7. Precast Concrete Transition Curb should meet the requirements of Standard Specifications Section 609 - Curb. The bridge end of the curb should be saw cut in the field to fit flush against the backwall, as dictated by the bridge skew angle and the profile grade. Where curbing is specified on the adjacent highway, the transition should be modified accordingly. Payment for transition curb will be considered incidental to the Concrete Transition Barrier pay item.

  8. Concrete Transition Barrier is designed for attachment of Bridge Transition Type "1" unless otherwise indicated on the Design Drawings. Refer to Section 606 for details.

  9. After installation of the guardrail is complete, upset the threads on the anchor bolts in three (3) places around each bolt, at the junction of the nut and the exposed thread, with a center punch or similar tool.

  10. If there is a conflict between these Standard Details and the Design Drawings, the requirements of the Design Drawings should be followed.

Maine Permanent Concrete Barrier Specifications

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

Plan View

Concrete transition barriers can be cut into three sections: the recess, the stem and the nose. The recess measures 1’-0” long; the stem measures 2’-8” long; and the nose measures 2’-8” long. The recess measures 1’-2” wide; the stem measures 1’-7” wide; and the nose measures 1’-7” wide.

Each barrier includes two guardrail anchor bolts, which are found on the right end of the barrier (according to the plan view). There is a distance of 8” between the two guardrail anchor bolts, and a distance of 1’-8” between the right-most anchor bolt and the back (end) of the barrier.

Elevation View

The height of the barrier is dependent on the type of traffic being guarded and whether the barrier will be set on a curb or on a sidewalk:

  • 2 – Bar Traffic = 2’-1-1/2” tall

  • 3 – Bar Bicycle = 2’-9-1/2” tall

  • 4 – Bar Bicycle = 3’-9-1/2” tall

  • 4 – Bar Pedestrian = 3’-6-1/2” tall

Barriers height measures 1’-11’ on curbs and 2’-8” on sidewalks.

When the Concrete Transition Barrier is cantilevered over an expansion joint, the nose should be blocked out.

Guardrail Anchorage Section

Each anchorage section is bound by a ¼” guardrail anchor plate and includes 4” galvanized (min.) Type I bolts. There are 5 bolts total. The bolts are 7/8” diameter x 8” A 325 Bolts. There is 1-1/2” between the bottom of the nut and the top of the projected bolt.

Guardrail Anchor Plate

The guardrail anchor plate has seven total holes stamped through the plate. On the long end of the plate, there are three 15/16” diameter holes spaced 7-5/8” apart. On the short end of the plate, there are two 15/16” diameter holes spaced 7-5/8” apart. In the center of the plate, there are two 4” diameter holes spaced 7-5/8” apart. All spacing is when measured from the center of the hole.

The long end of the plate measures 1’-6-1/2” long and the sort end of the plate measures 10-5/8” long. The guardrail anchor plate measures 11-1/4” wide.

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

BUY AND SELL WITH EIFFEL TRADING

Eiffel Trading’s heavy civil material inventory ranges from new and used precast barrier wall, to used HDPE pipe, to wide flange beams, and everything in between. Furthermore, our construction listings include
foundation equipment, concrete formwork, and much more.

All of our listings are constantly being updated, but if you don’t see what you’re looking for, create a wanted listing for free.

Ready to sell your used heavy equipment or construction material? List your products today for free on Eiffel Trading’s online marketplace.

If you have any questions or would like additional information, please call us at 1-800-541-7998 or email sales@eiffeltrading.com.