Pneumatic Piezometer
Slope Indicator’s pneumatic piezometer can be sealed in a borehole,
embedded in fill, or fixed in a standpipe. Twin tubing runs from the
piezometer to a terminal at the surface.
Water pressure and gas pressure act on opposite sides of a diaphragm
inside the piezometer body. The diaphragm acts as a valve. In its
“closed” position, it seals off the vent tube, preventing the escape
of gas.
When a reading is required, a pneumatic indicator with a supply of
nitrogen gas is connected to the tubing at the surface. The indicator
sends gas down the input tube. Gas pressure on the diaphragm
increases. Gas pressure becomes greater than the water pressure and
forces the diaphragm away from the vent tube. Gas then escapes
through the vent tube to the surface.
At the surface, the operator observes a return flow of gas and shuts
off the gas supply. Gas pressure in the piezometer tip decreases until
the diaphragm is again forced against the vent tube, preventing
further escape of gas.
At this point, gas pressure in the piezometer and tubing equals the
water pressure on the other side of the diaphragm. The operator
obtains a reading from the indicator’s pressure gauge, which is
connected to the input tube.
Piezometers
Inactive
Vent
Diaphragm
Water
Pressure
Pressure
Gauge
Input
Ready to Use
Activated
Vent
Input
PZOP NU . cd r
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.
