3.3
INSTALLATION
Cut piles at cut-off grade with pneumatic tools, sawing, or other approved
method. Bolt holes shall be of a size that will ensure a driving fit.
3.3.1
Test Piles
Shall be of the same diameter and type and driven in the same manner as
specified for production piles. Keep a record for each test pile and every
unusual occurrence during pile driving. Record every increase or decrease
of driving resistance and bring it to the attention of the Contracting
Officer. Properly located test piles may be used in the finished work.
Drive test piles in locations indicated.
[3.3.1.1
Load Tests
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NOTE: Delete these paragraphs if load testing is
not required. Insert the number of test piles to be
load tested or indicate on drawings. When it is
desirable to show analysis for determination of
allowable pile capacities from load tests and for
relating load test capacities to allowable loads,
the following shall be included:
1. Test measurements: The ultimate test load (200
percent of allowable design load) shall be
maintained for a minimum 24 hours and then released.
Broomed heads shall be cut to sound wood before
making settlement measurements. The safe or
allowable design capacity of a test pile as
determined from the results of load tests shall be
the lesser of the two values computed according to
the following:
(a) One-half the load that causes a net settlement
after rebound of not more than 0.25 mm per metric ton
0.01 inch per ton of total test load.
(b) One-half the load that causes a maximum gross
settlement of one inch provided that the load
settlement curve shows no sign of failure.
2. Pile capacity: The capacity, as driven, of
single piles not in clusters in the structure shall
be not less than [_____] [metric tons] [tons]. The
capacity will be determined by the following
formulas, modified according to the data obtained by
the load tests:
For single-acting hammers
[R = 2 WH/( s
+ 0.1P)
85.678
W]
[R = 2 WH/(S + 0.1 P/W)]
For double-acting hammers
SECTION 02458N
Page 12
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