Section 4141. Corrugated Metal Culvert Pipe
1. Unless specified otherwise, meet the requirements of AASHTO M 36/M 36M for the following:
· Circular corrugated steel culvert pipe, Type I.
· Pipe arch shapes, Type II.
· Coupling bands, special fittings, and associated hardware.
2. Meet requirements of AASHTO M 218 Steel Sheet Zinc Coated (Galvanized) for corrugated Steel Pipe or AASHTO M 274 Steel Sheet Aluminum Coated (Type 2) for corrugated Steel Pipe.
3. Metallic coated sheets or coils used for corrugated pipe shall meet requirements of, and be marked in accordance with ASTM A 929.
B. Corrugated Aluminum Pipe.
Unless specified otherwise, meet requirements of AASHTO M 196/M 196M for the following:
· Circular corrugated steel culvert pipe, Type I.
· Pipe arch shapes, Type II.
· Coupling bands, special fittings, and associated hardware.
C. The minimum sheet thickness will be shown in the contract documents.
D. When the diameter of round pipe is elongated, increase one diameter by approximately 5%. Permanently mark each piece at least once inside and once outside to indicate the top.
E. Types of approved coupling devices are described in Materials I.M. 441.01. Joint types are standard and positive, and the type may be designated in the contract documents. When not designated, either type may be used.
4141.02 COATED CORRUGATED PIPE.
A. Use pipe coated by either of the following methods:
1. Meet the requirements of Article 4141.01 and AASHTO M 245/M 245M, Type I. The polymeric coating is to have a minimum thickness of 0.010 inch (254 µm) on inside surfaces and 0.003 inch (76 µm) on outside surfaces.
2. Aluminized pipe meeting requirements of Article 4141.01 may be furnished.
B. Repair, to the Engineer’s satisfaction, breaks or damage to the coating that occur during handling or installation.
4141.03 METAL PIPE APRONS AND BEVELED END SECTIONS.
A. Materials for pipe aprons and beveled end sections shall meet requirements of AASHTO M 218/M 218M.
B. Galvanized sheet metal of aprons and end sections shall be comparable to pipe sections in type, grade, sheet thickness, corrugations, dimensions, and coatings.
C. Furnish Aaprons
and end sections shall meeting requirements of Standard Road Plans RF-5 DR-203 and RF-44 DR-211 .