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For pile loads not exceeding 25 tons for timber piles, nor 40 tons for concrete piles, concrete-filled steel pipe piles and rolled structural steel piles, the allowable pile loads may be determined by the value R obtained by one of the following formulas:
(a) For piles or mandrels whose weight is equal to or less than the weight of the striking parts.
(1) For single-acting steam hammers:
R | = | 2WH 3 + 0.1 |
(2) For double-acting and differential steam hammers:
R | = | 2 E S + 0.1 |
in which:
R = allowable pile load in pounds.
W = weight of striking part of hammer in pounds.
H = effective height of fall in feet.
E = actual energy delivered by the hammer per blow in foot-pounds.
S = penetration of pile per blow, in inches, determined under conditions acceptable to the building commissioner.
(b) For piles or mandrels whose weight is greater than the weight of the striking parts.
(1) For single-acting steam hammers:
R | = | 2WH(1 – 0.1P) S + 0.1W |
(2) For double-acting and differential steam hammers:
R | = | 2E(1 – 0.1P) S + 0.1W |
in which:
P = weight of pile or mandrel in pounds. Other terms as defined in (a) above.
(Prior code § 70-5.1; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 3-5-03, p. 104990, § 30; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)