3.3
FIELD TESTS AND INSPECTIONS
3.3.1
Test Piles
Test piles shall be of the class, and shall be driven in the manner
specified for all piling elsewhere in this section. A record shall be kept
for each test pile, of the number of blows required for each 1/3 m 1 foot
of penetration throughout the entire length of the pile, the penetration
per blow at such intervals as directed and the number of blows for the
final 150 mm 6 inches of penetration. The record shall include the type
and size of the hammer used, the rate of operation, and the type and
dimensions of driving helmet and pile cushion used. Any unusual occurrence
during driving of pile and any increase and decrease of driving resistance
shall be recorded by the Contractor and brought to the attention of the
Contracting Officer. The Government will use load test and test pile data
to determine the "calculated" pile tip elevation and the necessary driving
resistance. [_____] test piles shall be driven in the locations indicated
or directed by the Contracting Officer, with surrounding earth at the
elevations shown. Test piles properly treated and driven without damage to
the protective treated shell, and which are located properly, and have
adequate driving resistance may be used in the finished work. Jetting will
be permitted by the Contracting Officer only when test pile driving clearly
establishes the validity of its use.
3.3.2
Load Tests
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NOTE: The provisions of ASTM D 1143, such as pile
set-up time after driving, test load, method of
applying load, loading and unloading procedures,
instrumentation, etc., should be carefully examined
and modified as necessary to fit the specific load
test being conducted.
Delete this paragraph for projects for which load
testing is not specified. Insert the number of
piles to be load tested. When it is desirable to
show analysis for determination of pile capacities
from load tests and for relating load test
capacities to job capacities, the following should
be included.
Test Measurements: The ultimate test load shall be
maintained for not less than 24 hours and then
released. Broomed heads shall be cut to sound wood
before making penetration measurements. The safe
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 0.23 mm/metric ton
(0.01 inch/ton) of total test load.
b. One-half the load that causes a gross settlement
of not more than 25 mm (1 inch) provided that the
load settlement curve shows no sign of failure.
Pile Capacity:
The capacity, as driven, of single
SECTION 02457A
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