§ 27-707 Timber piles.
AC § 27-707
(a)Materials. Timber piles shall conform in quality to class A or B of reference standard RS 11-7.
(1)SIZE OF PILES. Piles shall be of adequate size to resist the applied loads without creating stresses in the pile materials in excess of twelve hundred psi for piles of southern pine, Douglas fir, oak, or other wood of comparable strength; or eight hundred fifty psi for piles of cedar, Norway pine, spruce or other wood of comparable strength. Except as provided in paragraph two of this subdivision, for piles forty feet or more in length and of thirty tons capacity or less, the following sizes or classes of piles shall be deemed to be adequate for considerations of stress in the pile material: a. Piles of twenty-five to thirty tons capacity – Class A or minimum eight inch tip with uniform taper. b. Piles of less than twenty-five tons capacity – Class A or B or minimum six inch tip with uniform taper.
(2)PILES DRIVEN TO END BEARING. All timber piles, regardless of capacity, driven to end bearing on soils of classes 1-65 through 5-65 shall be class A or shall have a minimum eight inch tip and a uniform taper.
(3)SPECIES OF WOOD. Any species of wood may be used that conforms to the provisions of reference standard RS 11-7 and that will stand the driving stresses.
(4)PEELING. Unless treated, piles need not be peeled.
(b)Limitations on use. Where timber piles are to be driven to end bearing on soils of classes 1-65 through 5-65 by use of an impact hammer, the installation of each such pile shall be under the personal supervision of an architect or engineer, and the operations of driving such piles, the observations of penetration resistance, and the operation of the equipment shall be so conducted as to terminate driving directly when the pile reaches bearing on the hard material. A report, prepared by the architect or engineer, describing the procedures, equipment, and precautions followed to prevent injury to the piling shall be submitted to the commissioner.
(c)Lagged and inverted piles. The use of lagged or inverted piles will be permitted. Double lagging shall be adequately connected to the basic pile material to transfer the full pile load from the basic pile material to the lagging without exceeding values of allowable stress as established in subchapter ten of this chapter. The connection for single lagging shall be proportioned for half the pile load. The diameter of any inverted timber pile at any section shall be adequate to resist the applied load without exceeding the stresses indicated in paragraph one of subdivision (a) of this section, but in no case shall it be less than eight inches.
(d)Installation.
