Tensioned-Rod
Extensometers
Tensioned-rod extensometers are typically used in deep boreholes.
In such installations, friction between the rod and its protective
sleeves becomes a significant factor that can hide real movement. A
mechanism in the reference head keeps the rod under tension, reduc-
ing the effect of friction.
Advantages
q
Works in any orientation, from vertical to horizontal.
q
Works well in both extension and compression.
Limitations
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Higher cost.
q
More difficult to install.
q
Lateral deformation can affect reading.
Untensioned-Rod
Extensometers
There is no tensioning mechanism in the reference head.
Advantages
q
Lower cost.
q
Easier to install.
Limitations
q
Useful length of rods is limited to 30 meters (fiberglass) or 50
meters (steel), except when rods are suspended from anchor
(in up-holes at angle greater than 45
.
).
q
Lateral deformation can affect reading.
Borehole Extensometers
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.
