Inclinometer Surveys
General Concerns
q
When possible, use the same probe and control cable for each
survey. If you must use different probes, be sure to note the serial
number of the probe used for each data set so any necessary cor-
rections can be made during data processing.
q
Mark the A0 casing groove with paint or a notch in the casing.
Train technicians to start the survey with the uppermost wheels
of the probe in this groove. See drawing below.
q
A new installation should be surveyed several times and a repre-
sentative data set chosen for use as the initial (datum) set. All sub-
sequent data sets will be compared with this set.
q
Determine the standard deviation of checksums (explained later)
for the initial data set. Record this value and use it for quick
validation of subsequent data sets.
q
Always use the same reference for depth control. If one technician
uses the top of the pulley assembly as reference and another
technician uses the top of the casing as reference, there will be a
300 mm difference in probe position from survey to survey.
Accurate results require placement repeatability of 6 mm
(0.25 inch) or better.
q
If you accidentally draw the probe past a reading depth, lower the
probe at least one depth below the intended depth. Then draw the
probe up to the intended depth a second time. This technique
ensures the probe will be positioned correctly.
Mark this Groove.
Always Start Survey with
Uppermost Wheels in this Groove.
The "A" Grooves are Typically
Aligned with the Direction
of Movement.
S EN SOR -2 . cdr
Rembco Geotechnical Contractors specializes in
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foundation repair
and support,
grouting,
shoring,
micropile
construction,
rock drilling, and we remediate
sinkholes. We use a
problem-solving approach in the geotechnical portions of buildings, bridges, water plants, sewage plants, tunnels,
installing caisson bottom, and roads. We are experienced in these applications:
micro piles,
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permeation and
pressure
grouting,
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chemical grouting,
micropiles,
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rock anchors.
Rembco techniques apply when adding new structures: especially
rock anchor,
microfine cement,
soil nailing, and
micropile
installations for foundation support. Our specialties are
soil nails,
rock anchor,
chemical and
compaction grouting,
mini piles,
sinkhole repair,
micropiles, and
soil nailing.
