3226Corrugated Steel Pipe

3226.1SCOPE

Provide prefabricated corrugated galvanized steel (CS) pipe to construct C ulverts and underdrains. The unmodified term “pipe” refers to any or all types of pipe. The Department will designate the size of the circular pipe by the N ominal inside diameter. The Department will designate the size of the pipe-arches by the span width measured from the inside crest of the corrugations.

3226.2REQUIREMENTS

Provide pipe meeting the requirements of AASHTO M 36 Standard Specification for Corrugated Steel Pip, Metallic-Coated, for Sewers and Drains, for the type required by the Contract and in accordance with the following: A Dimensions Ensure that pipe dimensions meet the requirements of AASHTO M 36 except as modified by the following:

meeting the requirements for specified thickness in AASHTO M 218 Standard Specification for Steel Sheet, Zinc-Coated (Galvanized), for Corrugated Steel Pipe, Table 4

3 inch by 1 inch, or 5 inch by 1 inch as shown on the Plans and meeting the requirements in AASHTO M 36, Table 1 for the provided pipe sizes

and meeting the requirements of AASHTO M 36, Table 3 for the provided pipe sizes. Provide the pipes with section properties meeting the requirements of AASHTO LRFD Bridge Design Specifications, Appendix A12 B Appurtenant Parts and Sections Provide metallic zinc (galvanized) coated steel aprons fabricated in accordance with this section and 3351, “Sheet Steel Products.” Provide elbow, tee, and wye sections as shown on the Plans and fabricated from standard pipe sections, using mitered and welded joints, forming the required intersection angles for each installation . Provide special adapters as necessary to make connections between different sizes and types of pipe.

Provide an outlet screen at each free end of underdrain systems. The Contractor may provide metal end caps to close the dead ends of pipe instead of installing concrete or vitrified clay plugs. C Identification Marks Mark each pipe section with identification meeting the requirements of AASHTO M 196. Provide pipe with a sheet thickness, as designated in the markings on sheets and coils, meeting the requirements in AASHTO M 218, Table 4.

3226.3SAMPLING AND TESTING

The Engineer will not accept units of pipe if the zinc (galvanized) coating has been burned by shop welding or otherwise damaged in shop fabrication, unless the Contractor regalvanizes the pipe units using the hot-dip process or the metalizing process specified in AASHTO M 36. Do not make shop repairs with zinc paint. Use the metalizing process to make zinc coating repairs on butt -welded seams of helical corrugated pipe, if the adjacent zinc coating is burned to a width greater than three times the metal thickness. After the Contractor delivers the pipe to the Project, the Engineer will inspect each unit for compliance with the details of construction, workmanship, and finish requirements . In addition to all other defects as listed in AASHTO M 36 constituting cause for rejection, the Engineer may reject, at the Project, any units damaged during shipment or fabrication. The Contractor may use zinc paint to repair pipe coating damage caused by job site field welding or fabrication in lieu of regalvanizing. Use organic zinc primer paint specified on the APL, Bridge Structural Steel Coating, “Three Coat Systems - Organic.” Clean the damaged area by sandblasting or as otherwise approved by the Engineer. Apply the zinc paint in accordance with instructions from the paint manufacturer.