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Geokon 4910, Instruction Manual

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TABLE of CONTENTS 

Instruction Manual............................................................................................................................................... 1

 

M

ODEL 

4910

 ......................................................................................................................................................... 1

 

INSTRUMENTED ROCKBOLT .............................................................................................................................. 1

 

1. INTRODUCTION ................................................................................................................................................... 1

 

1.1

 

T

HEORY OF 

O

PERATION

 ....................................................................................................................................... 1

 

2. INSTALLATION .................................................................................................................................................... 3

 

2.1

 

P

RELIMINARY 

T

ESTS

............................................................................................................................................ 3

 

2.2

 

I

NSTRUMENTED 

R

OCKBOLT 

I

NSTALLATION

 ......................................................................................................... 3

 

3. TAKING READINGS ............................................................................................................................................. 4

 

3.1

 

GK-404

 

R

EADOUT 

B

OX

 ....................................................................................................................................... 4

 

3.1.1 Operating the GK-404 ................................................................................................................................ 4

 

3.2

 

GK-405

 

R

EADOUT 

B

OX

 ....................................................................................................................................... 5

 

3.2.1 Connecting Sensors ..................................................................................................................................... 5

 

3.2.2 Operating the GK-405 ................................................................................................................................ 5

 

3.3

 

GK-403

 

R

EADOUT 

B

OX 

(O

BSOLETE 

M

ODEL

) ...................................................................................................... 6

 

3.3.1 Connecting Sensors ..................................................................................................................................... 6

 

3.3.2 Operating the GK-403 ................................................................................................................................ 6

 

4. DATA REDUCTION .............................................................................................................................................. 7

 

4.1

 

L

OAD 

C

ALCULATION

 ........................................................................................................................................... 7

 

4.2

 

T

EMPERATURE 

C

ORRECTION 

F

ACTOR

 ................................................................................................................. 8

 

4.3

 

E

NVIRONMENTAL 

F

ACTORS

 ................................................................................................................................. 8

 

5. TROUBLESHOOTING .......................................................................................................................................... 9

 

APPENDIX A. SPECIFICATIONS ......................................................................................................................... 10

 

A.1

 

S

PECIFICATIONS

 ................................................................................................................................................ 10

 

APPENDIX B. SAMPLE CALIBRATION REPORT ........................................................................................... 11

 

 

 

Summary of Contents for 4910

Page 1: ...rmation contained herein is believed to be accurate and reliable However Geokon assumes no responsibility for errors omissions or misinterpretation The information herein is subject to change without notification Copyright 2007 2019 by Geokon Doc Rev B 05 02 19 Instruction Manual Model 4910 Instrumented Rockbolt ...

Page 2: ......

Page 3: ...nnel There are no warranties except as stated herein There are no other warranties expressed or implied including but not limited to the implied warranties of merchantability and of fitness for a particular purpose Geokon is not responsible for any damages or losses caused to other equipment whether direct indirect incidental special or consequential which the purchaser may experience as a result ...

Page 4: ......

Page 5: ...EADOUT BOX 4 3 1 1 Operating the GK 404 4 3 2 GK 405 READOUT BOX 5 3 2 1 Connecting Sensors 5 3 2 2 Operating the GK 405 5 3 3 GK 403 READOUT BOX OBSOLETE MODEL 6 3 3 1 Connecting Sensors 6 3 3 2 Operating the GK 403 6 4 DATA REDUCTION 7 4 1 LOAD CALCULATION 7 4 2 TEMPERATURE CORRECTION FACTOR 8 4 3 ENVIRONMENTAL FACTORS 8 5 TROUBLESHOOTING 9 APPENDIX A SPECIFICATIONS 10 A 1 SPECIFICATIONS 10 APPE...

Page 6: ...CONNECTOR TO GK 404 4 FIGURE 4 LIVE READINGS RAW READINGS 5 FIGURE 5 TYPICAL MODEL 4910 CALIBRATION REPORT 11 TABLES TABLE 1 ENGINEERING UNITS CONVERSION MULTIPLIERS 7 TABLE 2 MODEL 4910 INSTRUMENTED ROCKBOLT SPECIFICATIONS 10 EQUATIONS EQUATION 1 DIGITS CALCULATION 7 EQUATION 2 LOAD CALCULATION USING LINEAR REGRESSION 7 ...

Page 7: ...ned by the torque applied to the rockbolt nut or to the hydraulic pressure exerted by a jack during installation To provide a permanent means of monitoring the load throughout the life of the rockbolt The Instrumented Rockbolt is read out by means of a hand held Readout Probe that is used to contact an electrode in the end of the bolt The probe is shown in Figure 1 The probe is connected to a read...

Page 8: ...2 Figure 2 Model 4910 Installation ...

Page 9: ...eading that will be subtracted from all subsequent readings to calculate the load Note that each Instrumented Rockbolt has a different no load reading which is not zero See Section 3 for operation of the Readout Boxes 2 2 Instrumented Rockbolt Installation Connect the instrumented section to the rest of the rockbolt using the coupler provided make sure that the electrode end points out of the end ...

Page 10: ...bare To turn the GK 404 on press the ON OFF button on the front panel of the unit The initial startup screen will be displayed After approximately one second the GK 404 will start taking readings and display them based on the settings of the POS and MODE buttons The unit display from left to right is as follows The current Position Set by the POS button Displayed as a letter A through F The curren...

Page 11: ...nector until it locks into place Connecting sensors with bare leads Attach the GK 403 2 flying leads to the bare leads of a Geokon vibrating wire sensor by connecting each of the clips on the leads to the matching colors of the sensor conductors with blue representing the shield bare 3 2 2 Operating the GK 405 Press the button labeled POWER ON A blue light will begin blinking signifying that the R...

Page 12: ... of the male connector until it locks into place Connecting Sensors with Bare Leads Attach the GK 403 2 flying leads to the bare leads of a Geokon vibrating wire sensor by connecting each of the clips on the leads to the matching colors of the sensor conductors with blue representing the shield bare 3 3 2 Operating the GK 403 1 Turn the display selector to position B 2 Turn the unit on 3 The reado...

Page 13: ...near Regression Where L is the load in lbs or kg etc R0 is the regression no load reading in digits s supplied on the calibration report A sample calibration report is given in Appendix B R1 is the current reading in digits G is the gauge factor as supplied on the calibration report K is the conversion factor optional as listed in Table 1 From To Lbs Kg Kips Tons Metric Tonnes Lbs 1 2 205 1000 200...

Page 14: ...he vibrating wire has the same temperature coefficient as the steel rockbolt no temperature correction is required 4 3 Environmental Factors Since the purpose of the instrumented rockbolt 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 rock strata monitored ...

Page 15: ...readout work with another instrumented rockbolt If not the readout may have a low battery or be malfunctioning Symptom Instrumented Rockbolt Fails to Read Is the electrode covered with dirt Clean the electrode with a swab attached to the readout probe Use electro contact cleaner or similar product Does the readout or datalogger work with another Instrumented rockbolt If not the readout or datalogg...

Page 16: ...y 0 5 FSR Resolution 0 5 microstrain equivalent to 5 kg in a 25 mm dia bolt Repeatability 0 1 FSR Temperature Effect zero Temperature Range 40 to 80 C 40 to 110 F Frequency Output Range 1400 3000 Hz Over range 150 Bolt Size 25 mm or 8 rebar and larger Length 300 mm standard other lengths are optional Table 2 Model 4910 Instrumented Rockbolt Specifications ...

Page 17: ...11 APPENDIX B SAMPLE CALIBRATION REPORT Figure 5 Typical Model 4910 Calibration Report ...

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