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Steel-cased piles shall comply with the requirements of Sections 1812.5.1 through 1812.5.4.
1812.5.1 Materials
Shells or casings for steel cased piles shall be of steel and be sufficiently strong to resist collapse and sufficiently water tight to exclude any foreign materials during the placing of concrete. Steel shells shall have a sealed tip with a diameter of not less than 8 inches (203.2 mm).
1812.5.2 Allowable Stresses
For allowable stresses, see Table 1810.8.
1812.5.2.1 Shell Thickness
The thickness of the steel shell shall not be less than manufacturer's standard No. 14 gage (0.068 inch) (1.75 mm) minimum.
1812.5.2.2 Shell Type
The shell shall be seamless or provided with seams of strength equal to the basic material and be of a configuration that will provide confinement to the cast-in-place concrete.
1812.5.2.3 Strength
The ratio of steel yield strength (fy) to 28-day specified compressive strength (f'c) shall not be less than six.
1812.5.2.4 Diameter
The nominal diameter of steel cased piles shall not be greater than 16 inches (406.4 mm).
1812.5.3 Installation
Steel shells shall be mandrel driven for their full length in contact with the surrounding soil. The steel shells shall be driven in such order and with such pacing as to ensure against distortion of or injury to steel cased piles already in place. A steel cased pile shall not be driven within four and one-half average diameters of a steel cased pile filled with concrete less than 24 hours old unless approved by the commissioner. Concrete shall not be placed in steel shells within heave range of driving.
1812.5.4 Reinforcement
Reinforcing shall be required for unsupported lengths of steel cased piles or where the steel cased pile is designed to resist uplift or unbalanced lateral loads. For minimum concrete cover requirements, see Table 1810.2.13.
1812.5.4.1 Seismic Reinforcement
Where a structure is assigned to Seismic Design Category C or D in accordance with Section 1613, the reinforcement requirements of Sections 1812.1.2.3 through 1812.1.2.5 shall be met.

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