piles not in clusters in the structure shall be not
less than [_____] metric tons tons. The capacity
shall be determined by the following formulas,
modified according to the data obtained by the load
tests:
For single-acting hammers:
R= (166.7HW)/ (S + 2.54P/W); expressed in N
R= 2HW/ (S + 0.1P/W); expressed in pounds
For double-acting hammers:
R= 166.7E/ (S + 2.54 P/W); expressed in N
R= 2 E/(S + 0.1 P/W); expressed in pounds
Where:
R is the allowable static pile load in
N pounds.
W is the weight of the striking part of the hammer
in N pounds.
H is the effective height of fall in
meters feet.
E is the actual energy delivered by
the hammer per blow in
N foot-pounds.
S is the average net penetration in
mm inches
per blow for the last five blows after
the pile has been driven to a depth
where successive blows produce
approximately equal net penetration
(a minimum distance of
1 meter 3 feet
for friction piles).
P is the weight of the pile in
N pounds.
If P is less than W, P/w shall be taken as unity.
Dynamic pile stresses should not exceed the crushing
strength of piles.
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Loads tests shall be in accordance with ASTM D 1143, [_____] loading
method. The apparatus for applying the vertical loads shall be as given by
the method, either for load supported directly by the pile, or load from
weighted box or platform or reaction frame attached to sufficient uplift
piles to take safely the required load applied to the pile by hydraulic
jack. The load tests at locations shown or directed shall be made on test
piles driven to the tip elevation used for establishing lengths of piles
for bidding, except as otherwise directed. Additional load tests, at the
expense of the Government, may be required.
3.4
SPECIAL INSPECTION AND TESTING FOR SEISMIC-RESISTING SYSTEMS
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NOTE: Include this paragraph only when special
SECTION 02457A
Page 14
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