3351.1SCOPE
Fabricate galvanized sheet steel products for erosion control or other uses, including open metal flumes or gutters, Culvert headwalls or aprons, anti-seepage diaphragms, erosion dams, and cribbing.
3351.2REQUIREMENTS
The term, “metal unit” refers to the products specified in this section. A Materials Provide galvanized steel in the fabrication of metal units meeting the requirements of ASTM A929, Standard Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel Pipe, except as modified for different coating classes. If the Plans or Specifications specify a galvanized coating requirement other than 2 ounce per square foot of sheet, provide galvanized coating in accordance with ASTM A653, Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process. Provide the steel thickness shown on the Plans. Galvanize rivets consisting of the same base metal as used for the sheets. Unless the C ontract requires otherwise, provide bolts, nuts, and washers of commercial grade and galvanized in accordance with ASTM A153, Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware. Provide other unspecified steel shapes, plates, bars, and rods made of steel meeting the requirements of 3306, “Low-Carbon Structural Steel,” and galvanized in accordance with ASTM A123, Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products. B Fabrication Provide units fabricated to the shape and dimensions shown on the P lans. Avoid cracking or breaking the spelter coating on galvanized sheets. Ensure fabricated units of the same Nominal size and type are interchangeable. Do not drill, punch, or drift to correct defects in manufacture. Ensure the centers of rivets or bolt holes are at least twice the diameter of the holes from the edge of the metal. Locate slots, holes, and lugs for accurate field assembly as shown on the Plans. Drive rivets cold, and ensure the plates are drawn tightly together throughout the entire lap. Provide rivets with full hemispherical heads or heads of a form acceptable to the Engineer . Drive rivets without bending and completely fill the hole with driven rivets.
3351.3SAMPLING AND TESTING ................................................................................................... 3226.3
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