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경매번역카페 무료번역질문:

3.3.5 Predrilling of Piles
Predrilling to remove soil or other material representing the bulk of
the volume of the pile to be driven will be permitted only when test
piles clearly establish validity of its use, or as directed by the
Contracting Officer. Predrilling shall be as determined by the
Contractor's Geotechnical Engineer and approved by the Contracting
Officer. The diameter of the predrilled hole should not be greater
than 150 mm larger than the pile diameter.
Predrill only to depths required to mitigate ground vibration and/or
noise or to penetrate beyond obstructions (e.g. cobbles, boulders).
Where allowable limits are not otherwise stated, allowable ground
vibration and noise limits shall be 25 mm per second and 70 dB,
respectively, as measured at existing adjacent structures. Discontinue
predrilling at least 1.5 m above the pile tip elevation and subsequently
drive the pile to its final depths of penetration. Pile shall be driven
a minimum 1.5 m beyond predrill depths.
Predrilling shall be carried out in a manner which will not impair the
capacity of the piles already in place or the safety of existing
adjacent structures. If the Contracting Officer determines that
predrilling has disturbed the capacities of previously installed piles,
those piles that have been disturbed shall be restored to conditions
meeting the requirements of this specification by re-driving or by other
methods acceptable to the Contracting Officer. All work in connection
with restoring disturbed piles shall be done at no additional cost to
the Government.
Voids around the pile shall be completely filled with cement grout.
Cement grout shall be placed by tremie pipe and in one continuous
operation into the annulus between the pile and the predrill wall or
casing. If the predrill depth is less than 4.5 m and without fluid in
the predrilled holes, the grout may be placed either by pouring or
pumping. The discharge end of the tremie pipe shall be submerged at all
times. Additional grout shall be added from the surface to maintain the
level of the grout within 300 mm of the ground surface as grout
settlement occurs. For test piles with dynamic pile analysis, voids
around the pile shall be grouted after completion of dynamic testing.

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