3401Flanged Channel Sign Posts

3401.1SCOPE

Provide rerolled rail steel and comparable new billet steel posts for signs, delineators, and guide posts.

3401.2REQUIREMENTS

A Material Use posts made of rerolled rail steel or a new billet steel meeting the mechanical requirements of ASTM A499, Standard Specification for Steel Bars and Shapes, Carbon Rolled from ’T’ Rails, Grade 60. For rails weighing at least 91 pounds per yard of length, use steel meeting the chemical requirements of ASTM A1, Standard Specification for Carbon Steel Tee Rails. B Length Use posts with lengths within 1/2 inch as shown on the Plans or in the Special Provisions. C Weight Use posts with the following Nominal weights per length, as shown on the Plans or in the Special Provisions:

Verify the Nominal weights of the posts before punching and without galvanizing, or the addition of anchor plates or other attachments. Use posts weighing within 5 percent of the weight shown on the Plans or the Special Provisions. D Shape and Dimensions Use channel section design posts with flanges for the placement of the signs . Use flanges with a flat front face and positioned in the same plane to provide a smooth, uniform bearing for the sign. The back of the flanges and the posts shall be flat and parallel to the front. Connect the backs of the flanges and the posts flat and parallel to the front. Make the cross-section of the posts symmetrical about the central axis, perpendicular to the front and back. Use straight posts, free of bow, twist, burrs, and other unsightly defects. Table 3401.2-1 Nominal Dimensions Dimension 2 pounds per foot 2 1/2 pounds per foot 3 pounds per foot 4 pounds per foot Width, overall across front (inches) 3 3 3 1/4 3 1/2 Width, back surface (inches) 1 1 1 1/4 1 1/4 Width, flanges (bearing surface) (inches) 1/2 1/2 5/8 3/4 Depth overall, front to back (inches) 1 3/8 1 3/8 1 1/2 1 1/2 Thickness of metal, flanges, and back (inches) 1/8 1/8 5/32 3/16 Note: Dimension requirements are for flat flange sections E Punching If the Plans specify posts weighing 2 pounds per foot of length, punch 7/16 inch diameter holes along the centerline of the back on 3 inch centers, beginning at 1 1/2 inches from the top and extending the full length of the post. Space the holes so that the variation in distance between the centers of any 2 holes is ±1/16 inches for each 1 inch between the holes. If using posts weighing at least 2 1/2 pound per foot of length, punch 3/8 inch diameter holes along the centerline of the back on either 1 inch or 3 inches centers, beginning 1 inch or 1 1/2 inches from the top and extending the full length of the post. Space the holes so that the variation in distance between the centers of any 2 holes is ±1/16 inches for each 1 inch between the holes. Punch holes so that cracks do not radiate from the holes. F Galvanizing Provide posts galvanized in accordance with ASTM A123, Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products.

3401.3SAMPLING AND TESTING

Obtain a certified mill analysis from the supplier that states the chemical composition of each lot of posts delivered. The Engineer may take samples for testing from any of the provided posts. During the inspection of any lot of posts, if the Engineer rejects more than 20 percent of the posts in the lot, the Engineer may reject the entire lot.