Vibrating Wire Eearth/Soil Press Gauges
The model VWE series vibrating wire soil/earth pressure cells is an embedded soil pressure sensor, which is mainly used to measure the stress of soil inside structures such as earth-rock dams, soil lifts, slopes, roadbeds,retaining walls and tunnels. The main parts of the sensor are made of special steel, which can be used in harsh environments. It has excellent performance,good precision and sensitivity, excellent waterproof performance, corrosion resistance and long-term stability, etc. After the cable protection measures are perfected, it can be directly buried in the compacted soil which has higher requirements on the instrument.
Overview
A single earth pressure box can only measure the positive pressure perpendicular to its surface, and 3 to 4 earth pressure boxes are buried in groups at a certain angle to each other, so that the large and small principal stresses and the maximum shear stress on the observation point can be obtained according to the stress state theory.
The vibrating wire type earth pressure box is mainly composed of pressure-bearing membrane, sealing cover, induction coil, high-strength steel wire, etc. There are two string clamps on the pressure-bearing membrane, which are connected with steel strings, as shown in the figure below. When in use, the change of pressure on the structure causes the deformation of the pressure film, this small deformation can change the tension of the steel string and thus affect the oscillation frequency of the steel string, and the change of the pressure on the pressure film can be converted by measuring the change of the oscillation frequency.
Main functional characteristics:
●Adopt imported steel string, stable temperature performance, long service life
● Built-in intelligent temperature sensor, easy to carry out temperature compensation, improve the accuracy and reliability of monitoring data
The main components are with special surface treatment process, suitable for harsh environment use
●With good accuracy and sensitivity, excellent water resistance and corrosion resistance
Product application field
● Monitoring of mound pressure in subway construction
● Pressure monitoring of retaining wall of foundation pit
● Stress monitoring of tunnel soil
● Subgrade soil stress monitoring
Specifications
|
Type |
VWE-0.35 |
VWE-0.7 |
VWE-1 |
VWE-2 |
VWE-3 |
|
Measuring Range(kPa) |
0~350 |
0~700 |
0~1000 |
0~2000 |
0~3000 |
|
Accuracy |
0.5%F.S |
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Resolution |
0.025%F.S |
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Temperature Range |
-40~80℃ |
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TemperatureAccuracy |
±0.5℃(@-10℃~70℃) |
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|
Temperature Resolution |
0.1℃ |
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Over Range |
1.5× rated pressure |
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Waterproof |
1.2× rated pressure |
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Insulation Resistance |
≥50MΩ |
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Size |
Φ25×160mm |
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