3.3.2.2
Torque Wrench Testing
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NOTE: Delete this paragraph for expansion anchors
which are not anchored by an applied torque, such as
self drilling anchors.
Torque wrench testing verifies that a torqued
expansion anchor has seated properly. If it has not
seated, the applied torque on the nut will cause the
bolt to twist in the hole. Torque wrench testing
does not load the bolt up to allowable load and
therefore does not verify the capacity of the
installed bolt.
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Torque wrench testing shall be done on not less than [50] [_____] percent
of the total installed expansion anchors and at least [one anchor] [[_____]
anchors] for every piece of equipment containing more than [two] [_____]
anchors. The test torque shall equal the minimum required installation
torque as required by the bolt manufacturer. Torque wrenches shall be
calibrated at the beginning of each day the torque tests are performed.
Torque wrenches shall be recalibrated for each bolt diameter whenever tests
are run on bolts of various diameters. The applied torque shall be between
20 and 100 percent of wrench capacity. The test torque shall be reached
within one half turn of the nut, except for 9 mm 3/8 inch sleeve anchors
which shall reach their torque by one quarter turn of the nut. If any
anchor fails the test, similar anchors not previously tested shall be
tested until [20] [_____] consecutive anchors pass. Failed anchors shall
be retightened and retested to the specified torque; if the anchor still
fails the test it shall be replaced.
3.3.2.3
Pullout Testing
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NOTE: Pullout testing is expensive and labor
intensive because of the apparatus needed to pull on
the anchor bolt. Pullout testing determines the
tension capacity of the anchor bolt. The amount of
load to be applied can vary between 0.5 to 2 times
the calculated load, depending on the importance of
the bolt. There is not a significant cost
difference between testing to 0.5 or 2 times the
calculated load; since most anchor bolts have a
factor of safety of 4, testing to twice the
specified load should not cause any distress. The
typical tension failure causes a shear cone to be
pulled out of the concrete, the slope of the cone is
about a 45 degree angle so there should be nothing
on the concrete surface in the vicinity of the bolt
to prevent the cone from pulling out. Shear testing
is usually not needed unless the bolt is heavily
loaded in shear and close to an edge.
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Expansion and chemically bonded anchors shall be tested by applying a
pullout load using a hydraulic ram attached to the anchor bolt. At least
[5] [_____] percent of the anchors, but not less than [3] [_____] per day
shall be tested. The load shall be applied to the anchor without removing
SECTION 13080
Page 12
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