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1808.2.8.1.5.1 Piles Installed by Use of Steam-Powered, Air-Powered, Diesel-Powered or Hydraulic Impact Hammers
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- The minimum required driving resistance and the requirements for hammer energies for various types and capacities of piles are given in Tables 1808.2.8.1.5A and 1808.2.8.1.5B. To obtain the required total driving resistance, the indicated driving resistances shall be added to any driving resistance experienced by the pile during installation, but which will be dissipated with time (resistance exerted by nonbearing materials or by materials which are to be excavated). For the purposes of this section, the resistance exerted by nonbearing materials may be approximated as the resistance to penetration of the pile recorded when the pile has penetrated to the bottom of the lowest stratum of nominally unsatisfactory bearing material (Class 6 and uncontrolled fills, but not controlled fill) or to the bottom of the lowest stratum of soft or loose deposits of soils of Class 4 or 5 but only where such strata are completely penetrated by the pile.
- Alternate for similitude method—The requirement for installation of piling to the penetration resistances given in Tables 1808.2.8.1.5A and 1808.2.8.1.5B may be waived where the following six conditions are satisfied:
- The piles bear on, or in, soil of Classes 2 through 5.
- The stratigraphy, as defined by not less than one boring for every 1600 square feet (149 m2) of building area, shall be reasonably uniform or divisible into areas of uniform conditions.
- Regardless of pile type or capacity, one load test, as described in Section 1808.2.8.1.5.3, shall be conducted in each area of uniform conditions, but not less than two typical piles for the entire foundation installation of the building or group of buildings on the site, nor less than one pile for every 15,000 square feet (1394 m2) of pile foundation area shall be load tested.
- Except as permitted by the provisions of paragraph 2.6 below, all building piles within the area of influence of a given load-tested pile of satisfactory performance shall be installed to the same or greater driving resistance as the successful load-tested pile. The same or heavier equipment of the same type that was used to install the load-tested pile shall be used to install all other building piles, and the equipment shall be operated identically. Also, all other piles shall be of the same type, shape, external dimension, and equal or greater cross-section as the load-tested pile. All building piles within the area of influence represented by a given satisfactory load-tested pile shall bear in, or on the same bearing stratum as the load test pile.
- A report by an engineer shall be submitted to the commissioner for review and approval establishing that the soil-bearing pressures do not exceed the values permitted by Table 1804.1 and that the probable differential settlements will not cause stress conditions in the building in excess of those permitted by the provisions of this code.
- Where the structure of the building or the spacing and length of the piling is such as to cause the building and its foundation to act as an essentially rigid body, the building piles may be driven to length and/or penetration into the bearing stratum without regard to penetration resistance, subject to the requirement of paragraph 2.5 above, relating to the submission and approval of a report.
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