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1808.2.8.1.5.3 Piles Installed by Use of Vibratory Hammer
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The capacity of piles installed by vibratory hammer shall not exceed the value established on the principle of similitude, as follows:
- Comparison piles, as required by the provisions of Item 4 below, shall be installed using an impact hammer and driving resistances corresponding to the proposed pile capacities as determined in paragraph 3 below or to tip elevations and driving resistances as determined by the engineer.
- For each comparison pile, an identical index pile shall be installed by use of the vibratory hammer at a location at least 4 feet (1219 mm), but not more than 6 feet (1829 mm), from each comparison pile. The index piles shall be installed to the same tip elevation as the comparison pile, except that where the comparison piles bear on rock, the index piles shall bear in or on similar material. All driving data for the index pile shall be recorded.
- The index piles shall be load tested in accordance with the provisions of Item 4 of this section. Should the specified load test criteria indicate inadequate capacity of the index piles, steps 1, 2, and 3 shall be repeated using longer, larger or other types of piles.
- All building piles within the area of influence of a given, satisfactorily tested index pile shall be installed to the same or lesser rate of penetration (inches per minute mm per minute) as the successful index pile. The same equipment that was used to install the index pile, identically operated in all aspects, shall be used to install the building piles. All building piles shall be of the same type size and shape as the index pile. All building piles within the area of influence as represented by a given satisfactorily tested index pile shall bear in, or on, the same bearing stratum as the index pile.
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