shall permit stressing of the tendon in increments and raising or lowering
the load in the tendon. [Stressing equipment for strands shall be capable
of stressing all elements equally and simultaneously.] The equipment shall
be calibrated with an accuracy of +2% and the calibration certificate and
graphs shall be available at the site. The production gage shall have
graduations of 500 kPa 100 psi or less. A second certified gage shall be
maintained for periodic verification of the production gage. A dial gage
or approved device shall be provided to measure total tendon elongation at
each load increment to the nearest 0.03 mm 0.001 inch. The dial gage shall
be capable of measuring the entire anchor movement without being reset.
Calibration of gages shall be verified no more than 30 calendar days prior
to commencing work under this contract and at six-month intervals
throughout the period of use.
3.1.4
Testing Equipment
Testing equipment shall consist of a hydraulic jack with calibrated
pressure gage for applying the load and a dial gage or vernier scale to
measure anchor movement. The ram travel of the stressing equipment shall
be not less than the theoretical elastic elongation of the total anchor
length at the maximum Test Load. The pressure gage shall be graduated in
[500] [_____] kPa [100] [_____] psi increments. The stressing equipment
and pressure gage must have been calibrated as a unit no more than 30
calendar days prior to commencing work under this contract and at six-month
intervals throughout the period of use. The movement measuring device
shall have a minimum travel equal to the theoretical elastic elongation of
the total anchor length at the maximum Test Load without resetting the
device. [An approved dial gage or vernier scale and stand shall be
provided to measure movement of the [wall] [structure].]
3.2
DRILLING HOLES
3.2.1
General
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NOTE: If redesign of anchored structures due to
relocation of anchors is to be performed by the
Contractor, the appropriate design criteria must be
furnished by the Government.
Limitations on distance between grout holes and
holes being drilled is based on prevention of
washout of fresh grout by drill water. The actual
distance, if required, should be determined on the
basis of integrity of the rock and whether or not
the hole was pregrouted.
When environmental considerations require
containment and disposal of waste water, the last
two sentences should be included and the work should
be coordinated with Section 01355A.
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The [top of bond zone elevations] [and other] physical conditions indicated
on the drawings are the result of [soil sampling] [and] [core borings].
(See also paragraph "PROJECT SITE CONDITIONS"). Holes shall be drilled at
the locations and inclinations shown and to the depths and diameters
determined by the Contractor to provide the design bond length and capacity
indicated on the drawings. The locations of the holes may be changed only
SECTION 02490
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