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CGEO INTERNATIONAL LIMITED CGEO-SG5, Руководство по установке

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CGEO-SG5

 

Rebar VW Strain Gauge                                                                                                                                        10 

CGEO INTERNATIONAL LIMITED 

                                                                              Installation Manual           

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. Seemingly minor effects may 
have a real influence on the behavior of the structure being monitored and may give an early 
indication of potential problems. Some of these factors include, but are not limited to: blasting, 
rainfall, tidal or reservoir levels, excavation and fill levels and sequences, traffic, temperature 
and barometric changes, changes in personnel, nearby construction activities, seasonal changes, 
etc. 

 

Содержание CGEO-SG5

Страница 1: ...CGEO INTERNATIONAL LIMITED Model CGEO SG5 Rebar Vibrating Wire Strain Gauge Installation Manual ...

Страница 2: ...CGEO SG5 Rebar VW Strain Gauge 1 CGEO INTERNATIONAL LIMITED Installation Manual ...

Страница 3: ... 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 Measuring Temperatures 8 4 DATA REDUCTION 9 4 1 Strain Calculation 9 4 2 Temperature Correction 9 4 3 Environmental Factors 10 5 TROUBLESHOOTING 13 APPENDIX A SPECIFICATIONS 14 A 1 Rebar Strain Gauges 14 A 2 Thermistor see Appendix B also 14 APPENDIX B THERMISTOR TEM...

Страница 4: ... a compression fitting See Figure 1 Rebar Strain Gauge Body Strain Gage Electromagnetic Coil Heat Shrink Weld Rebar Weld Thermistor Compression Fitting Instrument Cable 900 mm Figure 1 Model CGEO SG5 Rebar Strain Gauge The Model CGEO SG5 12 diameter 12 Vibrating Wire Rebar Strain Gauge or Sister Bar consists of a short length of high strength steel welded between two long sections of reinforcing b...

Страница 5: ...t differ by more than about 25 digits 10 microstrain Shipping shocks may however cause larger shifts If the reading is within 100 digits 40 microstrain of the factory zero and is stable it is safe to proceed with the 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 ma...

Страница 6: ...ags between the weld area and the coil housing Also take care not to damage or burn the instrument cable when welding After welding route the instrument cable along the rebar system and tie it off every 3 4 feet 1 meter using nylon cable ties Avoid using iron tie wire to secure the cable as the cable could be cut Be sure when installing the Strain Gauges to note the location and serial numbers of ...

Страница 7: ... 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 characteristi...

Страница 8: ...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 Cables may be spliced to lengthen them without affecting gage readings Always waterproof t...

Страница 9: ...gestions The thermistor will be read and output directly in degrees centigrade 3 Turn off the readout Or the unit will automatically turn itself off after approximately 15 minutes to conserve power 3 2 Measuring Temperatures Each Vibrating Wire Rebar Strain Gauge is equipped with a thermistor for reading temperature The thermistor gives a varying resistance output as the temperature changes Usuall...

Страница 10: ...t reading R1 of 7700 and a calibration factor G of 0 718439 microstrain per digit F 7700 8000 0 718439 215 5217 compression Symbol rule compression tension 4 2 Temperature Correction Rebar Strain Gauges are usually embedded in concrete and strained by the concrete the assumption being that the strain in the meter is equal to the strain in the concrete When the temperature changes the concrete expa...

Страница 11: ...of the Strain Gauge installation is to monitor site conditions factors which may affect these conditions should be observed and recorded Seemingly minor effects may have a real influence on the behavior of the structure being monitored and may give an early indication of potential problems Some of these factors include but are not limited to blasting rainfall tidal or reservoir levels excavation a...

Страница 12: ...8 02 0 05 28 01 0 03 35 0 6223 5 6222 5 6222 7 6222 9 34 98 0 05 35 00 0 01 Linear F G R1 R0 K T1 T0 Polynomial F AR1 2 BR1 C K T1 T0 kN Linear Gage Factor G 0 019589kN Digit kN Polynomial Gage Factor A B C Thermal Factor K 0 01517kN R0 Original reading T0 Original temperature CGEO INTERNATIONAL LIMITED Room 06 13A F South Tower World Finance Centre HarbourCity 17 Canton Road Tsim Sha Tsui Kowloon...

Страница 13: ...CGEO SG5 Rebar VW Strain Gauge 12 CGEO INTERNATIONAL LIMITED Installation Manual Figure 6 Sample Model CGEO SG5 Calibration Sheet ...

Страница 14: ...obable sources of electrical noise are motors generators and antennas Make sure the shield drain wire is connected to ground whether using a portable readout or datalogger Check whether the connection of readout and strain gauge s leads is well Does the readout work with another Strain Gauge If not the readout may have a low battery or be malfunctioning Symptom Strain Gauge Fails to Read Is the ca...

Страница 15: ...Pa 2000με Diameter 12mm 14 16 18 20 22 25 28 32 36 40mm 25 28 32 36 40mm Accuracy 0 25 F S Resolution 0 016 F S Temperature Range 20 80 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 Consult the factory for other sizes available A 2 Thermistor see Appendix B also Range 80 to 150 ...

Страница 16: ... 4 82 110 8 122 82 87K 37 8417 3 1418 43 342 2 83 107 9 123 77 66K 36 8006 4 1363 44 331 5 84 105 2 124 72 81K 35 7618 5 1310 45 321 2 85 102 5 125 68 30K 34 7252 6 1260 46 311 3 86 99 9 126 64 09K 33 6905 7 1212 47 301 7 87 97 3 127 60 17K 32 6576 8 1167 48 292 4 88 94 9 128 56 51K 31 6265 9 1123 49 283 5 89 92 5 129 53 10K 30 5971 10 1081 50 274 9 90 90 2 130 49 91K 29 5692 11 1040 51 266 6 91 8...

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