Vibrating Wire
Piezometers
Slope Indicator’s VWP piezometer is a pressure transducer that can
be sealed in a borehole or embedded in fill. Its sensing mechanism
consists of a tensioned steel wire, a diaphragm, and an electro-
magnetic coil. One end of the wire is connected to the diaphragm.
Pressure causes the diaphragm to deflect, reducing tension in the
wire. The magnetic coil is used to “pluck” the wire, causing it to
vibrate. The vibration of the wire near the coil generates a frequency
signal that is transmitted via a signal cable to the readout device.
Some readout devices display a simple frequency reading. Other
readouts, such as Slope Indicator’s DataMate series, convert the
frequency reading to units of pressure or water head.
Advantages
q
Reading station is remote from work area and does not interfere
with construction activity.
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Very good response time even in soils with low permeability.
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Easy to automate.
Limitations
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Calibrated components are buried.
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Resolution worst at low pressures.
q
Temperature corrections may be required for highest accuracy.
Piezometers
Rembco Geotechnical Contractors specializes in
slope stabilization,
soil nail wall,
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,
sinkhole repair,
permeation and
pressure
grouting,
soil nails,
cement grouting,
chemical grouting,
micropiles,
compaction grouting, and
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.
