wave equation analysis, the type capblock used
should be the same as that used in the analysis.
**************************************************************************
Use a hammer cushion or capblock between driving helmet or cap and hammer
ram consisting of [a solid hardwood block with grain parallel to the pile
axis and enclosed in a close-fitting steel housing] [aluminum and micarta
(or equal) discs stacked alternately in a steel housing]. Use steel plates
at top and bottom of capblock. [Replace wood capblock when it becomes
highly compressed, charred or burned, or becomes spongy or deteriorated in
any manner.] [Replace aluminum or micarta discs that have become damaged,
split, or deteriorated in any manner.] [Do not replace wood capblock
during final driving of any pile.] Do not use small wood blocks, wood
chips, rope, or other materials that permit excessive loss of hammer energy.
3.3
FIELD QUALITY CONTROL
3.3.1
Pile Records
For each pile, keep a record of the number of blows required for each 0.30 m
foot of penetration and the number of blows for the last 150 mm 6 inch
penetration or fraction thereof. Include in the record the beginning and
ending times of each operation during driving of pile, type and size of the
hammer used, rate of operation, stroke or equivalent stroke for diesel
hammer, type of driving helmet, and type and dimension of the hammer
cushion (capblock) and pile cushion used. Record re-tap data and any
unusual occurrence during driving of the pile. Include in the record
performance characteristics of jet pump, unassisted penetration of pile,
jet-assisted penetration of pile, and tip elevation before driving and at
end of driving. Notify Contracting Officer 10 days prior to driving of
piles. Submit complete and accurate records of installed piles to
Contracting Officer within 15 calendar days after completion of the pile
driving. Make pile-driving records available to the Contracting Officer at
the job site within 24 hours of each day's pile driving. A preprinted form
for recording pile driving data is included at the end of this section.
SECTION 02395
Page 21
Previous Page
