441 SECTION 840
840.01 Steel Piling
A.Steel H -Piling and Special Sections. Use materials for steel piling and special sections that meet AASHTO M 270, Grade 50.
B.Shells for Steel Encased Concrete Piling. Use shells for steel encased concrete piling that are either cylindrical pipe or tapered fluted. Use cylindrical pipe shells that are electric welded steel pipe or seamless steel pipe and that meet ASTM A 252, Grade 2. Use end closure plates that are 3/4 inch flat steel plate welded directly to the pipe and that do protrude beyond the perimeter of the pile.
840.02 Timber Piling
A.Requirements. Use timber piling that is clean-peeled and meets ASTM D 25. Provide a certificate of compliance for timber piling.
B.Dimensions. Provide piles with the diameters shown in Table 840-01. Table 840-01 Length of Piles Diameter (Inches) 3 Feet from Butt At Tip Under 40 feet 12 8 40 to 74 feet 13 7 75 to 90 feet 13 6 Over 90 feet As shown elsewhere in the contract
C.Treatment. If specified, treat timber piling according to Section 846, “Preservatives and Pressure Treatment Processes for Timber” . In addition to the requirements of Section 106.01 C, “Certificate of Compliance” , include the following information on the certificate of compliance: − The species of timber; − Type of preservative; and − Method of treatment.
840.03 Sheet Piling for Permanent Installation
A.Steel Sheet Piling. Use steel sheet piling that meets AASHTO M 202. 442 B. Corrugated Steel Sheet Piles. Provide steel sheet piles that are of the continuous interlock type and of the lengths and section modulus specified. Use new sheeting constructed using a base metal composed of open hearth steel. Form the interlock by bending the metal through 180 degrees or more, leave an opening of sufficient size to all ow free slippage of the adjoining sheet pile, while maintaining a reasonably snug fit. Provide sheet piles that are true, straight, and uniform in section. Use corner sections that are of the same section modulus and material as the regular sections. Section 846 443 SECTION 846 PRESERVATIVES AND PRESSURE TREATMENT PROCESSES FOR TIMBER
846.01 Timber Preservatives
Provide material that meets AASHTO M 133.
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 476–477 of 550.