CGEO-SG5 Vibrating Wire Rebar/ Sisterbar Strain Gauge

Product Detail

Description

The CGEO-SG5 Rebar Strain Gauge is designed for monitoring stress changes in rebar or anchor rods within concrete or other structures. The built-in temperature sensor also allows for the measurement of ambient temperature at the installation location. The ends of the rebar strain gauge can be welded in the middle of the rebar to be measured, or processed into threaded joints according to user-provided dimensions for easy on-site installation.

Small diameter rebar strain gauges (Φ12mm~Φ16mm) can be used as 'sisterbar', allowing them to be directly tied near the large diameter rebar (≥Φ22mm) to be measured. This enables stress measurement of the rebar using an equivalent measurement method.

Applications

Diaphragm and slurry walls

Monitoring of strain due to load

Bridges and dams

Monitoring strain and load during construction and service life

Piles and mass concrete

Monitoring strains in reinforcing bars during construction, pile testing and service life

Operation

The Rebar and Sister Bar Strain Gauge consists of a sealed element containing the wire, which is de-bonded from the concrete by a plastic coating. This is attached to two lengths of rebar, one at either end, which in turn are used to transfer strain from the structure to be monitored to the gauge. These rebar extensions are long enough to ensure full transfer of the strain within the concrete to the strain gauge.

The Rebar Strain Gauge is installed by welding the gauge into the rebar cage at a location within the structure suitable to accurately pass loads from the cured concrete into the gauge. Sisterbars (of 12mm diameter) are installed alongside existing lengths of rebar within the cage. Rebar Strain Gauges and Sisterbars are usually installed in pairs within the structure on either side of the neutral axis, so that bending movements can be separated from axial loads. The integrated thermistor allows for temperature data to be recorded, aiding the evaluation of thermally induced strains.

Features

Accurate, long-term stability

Robust design and reliable

Available for most rebar sizes

Fit for manual or remote reading

Range is adjustable to suit compression or tension

Integral thermistor

Specifications

Model	CGEO-SG5-XX-300	CGEO-SG5-XX-400
Range	2000με	2500με
Nonlinearity	Linearity: ≤1% F.S.; Polynomial: ≤0.5% F.S.
Resolution	≤ 0.07% F.S.
Temperature Range	-20° to +80°C
Waterproof	Customized
Diameter	12,14, 16, 18, 20, 22, 25, 28, 32, 36,40mm
Connecting Rod	High-strength Rebar or Round Steel