UFC 4-151-10
10 September 2001
2-1.2.7
Splicing. The necessity for pile splicing should be avoided through
selection of pile type and cross-section. However, where unavoidable, construct splices
to provide and maintain true alignment and position of the component parts of the pile
during installation. Construct splices capable of developing all germane structural
capacities of the spliced pile cross-sections regardless of the expected design loads of
the pile.
2-1.2.8
Mixed Types or Capacities of Piling and Multiple Types of Installation
Equipment or Methods. Mixed types or capacities of piling and different types of
installation equipment or methods are permitted, provided that the effects on the
superstructure of differential elastic shortening and settlement are considered.
2-1.2.9
Slope of Batter Piles. Unless special provisions are made for the
difficulties of installation and the effects of diminished driving energy on the capacity,
keep the maximum slope of the batter piles to 5 horizontal to 12 vertical maximum batter
or 4 horizontal to 12 vertical preferred or steeper.
2-2
REQUIREMENTS FOR SPECIFIC TYPE OF PILES
2-2.1
2-2.1.1
Marine / Brackish Water Environment. In general, do not use untreated
timber piles without total encasement in a marine or brackish water environment. The
one notable exception is their use as fender piles in volatile berthing areas where pile
longevity is dictated by impact damage rather than by biological attack. Otherwise,
encapsulate untreated piles exposed to air and water in one of the many flexible barrier
products now available. It is becoming increasingly common to install untreated piles with
these "wraps" as new construction, adding rub strips as appropriate for fender piles.
Untreated piles are also required in some locations, i.e. San Diego, due to local
environmental concerns over using salt treated timber in the marine environment.
2-2.1.2
Fresh Water Environment. Untreated, un-encased timber piles may be
used in fresh water applications as long as they are not exposed to air. They must be cut
off below the permanent ground water level or below MLW. As in the marine
environment, it is becoming more common to install untreated piles with flexible "wraps"
to protect the air-exposed portions as new construction.
2-2.1.3
conform to the American Society for Testing and Materials Specifications (ASTM) D25,
selecting the geometric property of butt diameter with respect to length in accordance with
ANSI 05.1, Class 3 poles, those most commonly used by utility companies.
2-5
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