CGEO-SG5
Rebar VW Strain Gauge 6
CGEO INTERNATIONAL LIMITED
Installation Manual
2.2.2. Model CGEO-SG5-12 "Sister Bar"
The "Sister Bar" is usually installed using standard iron tie wire. Normally ties near the ends and
at the one third points are sufficient if the gage is being wired to a larger section of rebar or to
horizontal bars. Wiring at the one third points alone is sufficient if the gage is being wired in
parallel to the structural rebar. See Figures 4 and 5. Route the instrument cable along the rebar
system and tie it off every 3-4 feet (1 meter) using nylon cable ties. Avoid using the tie wire on
the instrument cable as it could cut the cable.
Be sure when installing the Strain Gauges to note the location and serial numbers of all
instruments. This is necessary for applying the proper calibration factors and determining load
characteristics when reducing data.
Instrument Cables
Pile
Rebar Strain Gauges
(2 or 3 places)
Rebar Reinforcement or
Pre-Stressing Cables
Concrete
Rebar Strain Gauges
(2 or 3 places)
Rebar Strain Gauges
(2 or 3 places)
Figure 4 - Model CGEO-SG5 "Sister Bar" Installation
