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4810
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Geokon 4810 manual available for free PDF download: Instruction Manual
Geokon 4810 Instruction Manual (40 pages)
VW Earth Pressure Cells
Brand:
Geokon
| Category:
Industrial Equipment
| Size: 2.17 MB
Table of Contents
Table of Contents
5
Introduction
11
Theory of Operation
11
Figure 1: Stress Redistribution, Weak Soil with Stiff Cell
11
Equation 1: Terzaghi's Principle of Effective Stress
11
Earth Pressure Cell Design
12
Figure 2: Stress Redistribution, Strong Soil with Stiff Cell
12
Figure 3: Stress Redistribution, Stiff Soil with Weak Cell
12
Earth Pressure Cell Construction
13
Model 4800 Earth Pressure Cells
13
Figure 4: Model 4800 Rectangular Earth Pressure Cell
13
Figure 5: Model 4800 Circular Earth Pressure Cell
13
Model 4810 Contact ("Fat Back") Pressure Cell
14
Model 4815 Hydraulic Load Cell
14
Figure 6: Model 4810 Contact Pressure Cell
14
Figure 7: Model 4815 Hydraulic Load Cell
14
Model 4820 Earth Pressure "Jackout" Cell
15
Model 4830 Push-In Pressure Cell
15
Figure 8: Model 4820 Jackout Load Cell
15
Figure 9: Model 4830 Push-In Pressure Cell
15
Installation
16
Preliminary Tests
16
Pressure Cell Installation
16
Inside Fills and Embankments
16
Figure 10: Model 4800 Earth Pressure Cell Installation
17
Installation of Model 4810 Contact ("Fat Back") Pressure Cell
18
Table 1: Ratios for Two Grout Mixes
18
Figure 11: Attachment of Model 4810 to Concrete Form
19
Figure 12: Model 4810 Contact Pressure Cell Installation
19
Installation of Model 4815 Hydraulic Load Cell
20
Installation of Model 4820 Jackout Pressure Cell in Slurry Trenches
20
Figure 13: Model 4815 Hydraulic Load Cell Measuring Loads
20
Installation of Cells to Measure Earth Pressure at the Base of Footings, Floor Slabs, Pavements, Etc
21
Figure 14: Model 4820 Jackout Pressure Cell Installation
21
Installation of Push-In Pressure Cells to Measure Lateral Earth Pressures
22
Figure 15: Model 4800-1-1P Earth Pressure Cell Installation
22
Cable Installation and Splicing
23
Table 2: 4830 Wiring Chart
23
Electrical Noise
24
Initial Readings
24
Taking Readings
25
Operating the Gk-404
25
Gk-405 Vibrating Wire Readout
25
Figure 16: Gk-404 Readout
25
Figure 17: Lemo Connector to Gk-404
25
Figure 18: Gk-405 Readout
25
Connecting Sensors with 10-Pin Bulkhead Connectors Attached
26
Connecting Sensors with Bare Leads
26
Operating the Gk-405
26
Measuring Temperatures
26
Data Reduction
27
Pressure Calculation
27
Table 3: Engineering Units Multiplication Factors
27
Equation 2: Digits Calculation
27
Equation 3: Convert Digits to Pressure
27
Temperature Correction
28
Barometric Correction
28
Equation 4: Temperature Correction
28
Figure 19: Sample Model 4800 Calibration Sheet
29
Troubleshooting
30
Appendix A. Specifications
31
Earth Pressure Cells
31
Standard Temperature Thermistor
31
Table 4: Earth Pressure Cell Specifications
31
Appendix B. Thermistor Temperature Derivation
32
Table 5: 3Kω Thermistor Resistance
32
Equation 5: 3Kω Thermistor Resistance
32
Appendix C. Temperature Effect on Earth Pressure and Concrete Stress Cells
33
Formulas
33
Figure 20: Radius (R) and Thickness (D)
33
Equation 6: Expansion of Liquid for a 1° C Temperature Rise
33
Equation 7: Compression of Liquid
33
Equation 8: Expansion of Liquid
33
Equation 9: Deformation at the Center
33
Equation 10: Deformation at the Edge
34
Equation 11: Difference in Deformation
34
Equation 12: Average Total Expansion of the Cell
34
Equation 13: Combined Equations
34
Equation 14: Total Embedment
34
Equation 15: Total Embedment for Contact Pressure Cells
34
Examples
35
Table 6: Typical Values of Various Cell Parameters
35
Appendix D. Improving Calculated Pressure Accuracy
37
Equation 16: Pressure Calculation with Second Order Polynomial
37
Equation 17: "Linearity (%F.s.)" on Calibration Sheet
37
Equation 18: Calculating C Using the Zero Pressure Reading
37
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