3402Square Tubular Sign Posts

3402.1SCOPE

Provide square steel tubular posts for signs.

3402.2REQUIREMENTS

A Material Use steel posts meeting standard specification for hot rolled carbon sheet steel, structural quality, ASTM A1011, Standard Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with Improved Formability, and Ultra-High Strength, Grade 50. The average minimum yield strength after cold forming shall be a minimum of 50,000 psi. B Length Use posts with lengths within 1/4 inch of the length shown on the Plans or in the Special Provisions. C Weight Use posts in accordance with the following, as shown on the Plans or in the Special Provisions: Table 3402.2-1 Properties Size USS Gauge Weight 1 1/2 inches by 1 1/2 inches 12 1.7 pounds/foot 1 3/4 inches by 1 3/4 inches 14 1.71 pounds/foot 1 3/4 inches by 1 3/4 inches 12 2.06 pounds/foot 2 inches by 2 inches 12 2.42 pounds/foot 2 3/16 inches by 2 3/16 inches 10 3.43 pounds/foot 2 1/4 inches by 2 1/4 inches 12 2.77 pounds/foot 2 1/2 inches by 2 1/2 inches 12 3.14 pounds/foot 2 1/2 inches by 2 1/2 inches 10 4.01 pounds/foot

The post weight shall be within 7 percent of the weight shown for the specified post size and gauge. D Cross-Section Use square tube formed of the size and gauge of steel as shown in P lans or Special Provisions, carefully rolled to size and welded directly in the corner by high frequency resistance welding and externally scarfed to agree with corner radii. E Hole Punching Use posts with punched holes 7/16 ± 1/64 inch in diameter on 1 inch centers on 4 sides down the entire length of the post. Holes shall be on centerline of each side and in true alignment and opposite of each other directly and diagonally.

F Coating Use posts hot dip galvanized steel in accordance with ASTM A653, Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process, G90. The corner weld shall be zinc coated after scarfing operation. The steel shall also be coated with a chromate conversion coating and a clear organic polymer topcoat. Both the interior and the exterior of the post shall be galvanized. Modifications made to the post after the initial fabrication, such as additional welding or other alterations shall be galvanized. G Telescoping Properties Use straight posts, with a smooth uniform finish free of bow, twist , and other unsightly defects. holes and ends shall be free from burrs and ends shall be cut square. Telescoping systems shall meet dimensional requirements and shall permit consecutive sizes of square tubes to telescope freely without necessity of matching any particular face to any other face. H Anchors Use galvanized square tube anchors as shown in Plans or in the Special Provisions.

3402.3SAMPLING 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.