Related Manuals for CGEO INTERNATIONAL LIMITED CGEO-SG5
Summary of Contents for CGEO INTERNATIONAL LIMITED CGEO-SG5
- Page 1 CGEO INTERNATIONAL LIMITED Model CGEO-SG5 Rebar Vibrating Wire Strain Gauge Installation Manual...
- Page 2 CGEO-SG5 Rebar VW Strain Gauge CGEO INTERNATIONAL LIMITED Installation Manual...
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Page 3: Table Of Contents
2.1. Preliminary Tests ..........................4 2.2. Rebar Strain Gauge Installation ....................... 5 2.2.1. Model CGEO-SG5 ........................ 5 2.2.2. Model CGEO-SG5-12 "Sister Bar" ................. 6 2.3. Cable Installation ..........................7 3. TAKING READINGS ......................8 3.1. Operation of the BSIL-RO-VW Readout Box ................. 8 3.2. -
Page 4: Introduction
Beijing Soil Instruments Ltd. The Model CGEO-SG5 Vibrating Wire Rebar Strain Gauge consists of a short length of high strength steel welded between two long sections of reinforcing bar. It is designed to be welded between sections of structural concrete reinforcing bar. -
Page 5: Installation
By pulling on the Strain Gauge it should be possible to change the readout digits, causing them to rise as tension increases. Checks of electrical continuity can also be made using an ohmmeter. For the CGEO-SG5, resistance between the gage leads should be approximately 180 ± 10 ohm. Remember to add cable resistance when checking (stranded copper leads are approximately 50ohm /km, multiply by 2 for both directions). -
Page 6: Rebar Strain Gauge Installation
(2 places, opposite) Rebar Reinforcement Concrete Material to be excavated Tieback (installed after excavation) Rebar Strain Gauges (2 places, opposite) Tieback (installed after excavation) Rebar Strain Gauges (2 places, opposite) Figure 3 - Model CGEO-SG5 Installation CGEO INTERNATIONAL LIMITED Installation Manual... -
Page 7: Model Cgeo-Sg5-12 "Sister Bar
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 CGEO INTERNATIONAL LIMITED Installation Manual... -
Page 8: Cable Installation
Wire Tie Tied to Reinforcing Rebar Tied to Reinforcing Rings Figure 5 - Model CGEO-SG5 "Sister Bar" Installation Detail 2.3. Cable Installation As noted in the installation sections, route the instrument cables along the structural rebar and tie off using nylon cable ties every 2-3 feet (1 meter) to secure. Outside of the instrumented structure, the cable should be protected from accidental damage caused by moving equipment or other construction activity. -
Page 9: Taking Readings
CGEO-SG5 Rebar VW Strain Gauge 3. TAKING READINGS 3.1. Operation of the BSIL-RO-VW Readout Box BSIL-RO-VW readout is suitable for all BSIL vibrating wire sensors. Connect the Readout using the flying leads or in the case of a terminal station, with a connector. -
Page 10: Data Reduction
CGEO-SG5 Rebar VW Strain Gauge 4. DATA REDUCTION 4.1. Strain Calculation The basic units utilized by Soil for measurement and reduction of data from Vibrating Wire Rebar Strain Gauges are "digits". Calculation of digits is based on the following equation;... -
Page 11: Environmental Factors
CGEO-SG5 Rebar VW Strain Gauge K is the thermal coefficient. Normally the effect of temperature to VW strain gauge is little, it needn’t to be corrected. Detail calculation method see calculation equation and related factor in calibration certificate. 4.3. Environmental Factors Since the purpose of the Strain Gauge installation is to monitor site conditions, factors which may affect these conditions should be observed and recorded. - Page 12 CGEO-SG5 Rebar VW Strain Gauge CGEO INTERNATIONAL LIMITED Room 06, 13A/F., South Tower, World Finance Centre, HarbourCity, 17 Canton Road, Tsim Sha Tsui, Kowloon,Hong Kong. Tel: +852 2206 0092 Fax: +852 3003 0133 VIBRATING WIRE SISTER BAR STRAIN GAUGE CALIBRATION CERTIFICATE...
- Page 13 CGEO-SG5 Rebar VW Strain Gauge Figure 6 - Sample Model CGEO-SG5 Calibration Sheet CGEO INTERNATIONAL LIMITED Installation Manual...
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Page 14: Troubleshooting
Symptom: Strain Gauge Fails to Read Is the cable cut or crushed? This can be checked with an ohmmeter. For the CGEO-SG5, nominal resistance between the two gage leads (usually red and black leads) is 180ohm+/-10, Remember to add cable resistance when checking (22 AWG stranded copper leads are approximately 50ohm /km, multiply by 2 for both directions). -
Page 15: Appendix A - Specifications
Water Proof customized 0.5, 2MPa available or others Connecting Bar high strength whorl steel or steel Table A-1 Model CGEO-SG5 Rebar Strain Gauge Specifications Notes: ¹ Consult the factory for other sizes available. A.2 Thermistor (see Appendix B also) Range: -80 to +150° C Accuracy: ±... -
Page 16: Appendix B - Thermistor Temperature Derivation
CGEO-SG5 Rebar VW Strain Gauge APPENDIX B - THERMISTOR TEMPERATURE DERIVATION Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 Resistance to Temperature Equation: 2732. B(LnR) C(LnR) Equation B-1 Convert Thermistor Resistance to Temperature T： Temperature in C. Where; LnR：Natural Log of Thermistor Resistance A：...