Tiltmeter
(continued)
To obtain tilt readings, the operator connects the tiltmeter to the
readout unit and positions the tiltmeter on the tilt plate, with the (+)
marking on the sensor base plate aligned with peg 1. The operator
then notes the displayed reading, rotates the tiltmeter 180
.
, and ob-
tains a second reading. Later, the two readings are averaged to can-
cel sensor offset.
Changes in tilt are found by comparing the current reading to the
initial reading. A positive value indicates tilt in the direction of peg 1
(peg 1 down, peg 3 up). A negative value indicates tilt in the direc-
tion of peg 3.
The metric tiltmeter and indicator deliver a resolution of 8 arc sec-
onds or 0.004 mm of movement over the 101 mm base of the tilt
plate. The English tiltmeter and indicator deliver a resolution of 10
arc seconds or 200 micro-inches of movement.
Advantages
q
Only one tiltmeter is required for many tilt plates.
q
Tilt plates can be glued or bolted to convenient surfaces of the
structure.
Limitations
q
Tilt measurements are local to the tilt plate. Extrapolating tilt in
larger portions of the structure or interpolating rotation between a
number of survey points involves assumptions about the rigidity
and behavior of the structure.
q
Tilt plates must be protected from accidental damage
and vandalism.
q
Remote reading is not available.
Beam Sensors and Tiltmeters
Orientation for Horizontal Mounting
Orientation for Vertical Mounting
Rembco Geotechnical Contractors specializes in
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and support,
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Rembco techniques apply when adding new structures: especially
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installations for foundation support. Our specialties are
soil nails,
rock anchor,
chemical and
compaction grouting,
mini piles,
sinkhole repair,
micropiles, and
soil nailing.
