600-225Section 655 — Square Tube Posts
655.1Description
1 Furnish, fabricate, and install square tub e posts.
655.2Materials
1 Fabricate posts from cold- rolled steel strip, and apply a commercial quality zinc coating that conforms to ASTM A653 G90 or G140. Use Grade 50 steel. Ensure that the posts are galvanized for their full length and total area. Ensure that the cross section of the post is a square tube formed of 12 gauge (0.105 in.) steel. Ensure that the tubing is high frequency resistance welded in the corner and externally scarfed to agree with a specified corner radii of 5/32 in. ±1/64 in. to ensure proper telescoping action. 2 Use a ⅜-in. galvanized corner bolt of the appropriate length, lock washer, and nut to connect the sign post and the stub assembly. 3 Provide the Mill Test Reports and a Materials Certification for each shipment of square tubing to the RCE . Ensure that the Mill Test Report identifies the various lots of tubing. Ensure that the chemical and physical properties conform to the requirements of the specified alloy. Ensure that the production lots are identifiable upon receipt at the site. Failure to provide Mill Test Reports and Materials Certifications may result in the rejection of all materials and require replacement at the Contractor ’s expense.
655.3Construction
655.3.1 Fabrication 1 Ensure that the post is straight with a smooth finish to allow a smaller tube to fit freely into the larger tube with minimum play. Punch standard clean- punched open holes 7/16 in. (+1/64 in.) in diameter on 1- in. centers on all four sides beginning 1 in. from the top in each section with the hole spacing being accurate to ⅛ in. in 20 ft of tube length . Ensure that holes are free from plugs and burrs . Holes do not require zinc treatment after fabrication.
655.3.2 Erection 1 Align and locate signs, delineators, and bridge marker posts accurately. Ensure that posts are located properly to provide the sign or delineator with the required pavement edge clearance. 2 Locate and orient the posts so that the mounted sign or delineator approximates the location and orientation shown on the Plans. Use the Plans as a guide for placement of the signs. Some variations may be necessary to erect the sign in the best location.