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ZX30 vibrating wire multi-point displacement meter

ZX30 multi-point displacement meter adopts vibrating wire structure, which is composed of the displacement meter with supporting accessories. It mainly includes sensors, sensor shields, measuring rods and PVC protective tubes, as well as mounting bases, anchor heads, and signal transmission cables. Etc composition.
ZX30 vibrating wire multi-point displacement meter

Instrument model and structure:
According to the different measurement ranges, the measured displacement can be divided into 50mm and 100mm, and can be divided into four kinds of measuring points, 2.3 4 .5.
ZX30 multi-point displacement meter adopts vibrating wire structure, which is composed of the displacement meter with supporting accessories. It mainly includes sensors, sensor shields, measuring rods and PVC protective tubes, as well as mounting bases, anchor heads, and signal transmission cables. Etc composition.
Instrument use:
ZX30 vibrating wire type multi-point displacement meter is suitable for long-term buried in hydraulic structures or earth dams, earth embankments, slopes and other structures, measuring displacements, settlements, strains, slips, etc. in multiple deep parts of the structure, and The temperature of the buried point can be measured simultaneously.
Features:
Multi-point displacement meters are widely used in different places and environments. The buried methods include horizontal, inclined, and vertical burial. They are installed in the corridor of the dam, on the abutment of the dam, and in the tunnel. , Mountain slopes, earth dams, embankments, and so on. The working conditions of these instruments are different, so the installation methods are different. The following is a brief description of the installation methods for burying on the rock mass to measure the stability of the rock mass. Other installation methods can be referred to.
working principle:
When the structure under test is deformed, the rod will be driven by the anchor of the multi-point displacement meter. The rod will pull the displacement meter to produce displacement deformation. The deformation is transmitted to the vibrating string to change into vibrating string stress, thereby changing the vibration of the vibrating string. frequency. The electromagnetic coil excites the vibrating string and measures its vibration frequency. The frequency signal is transmitted to the reading device through the cable, and the deformation of the structure under test can be measured. Simultaneously measure the temperature of the buried point (optional).
Technical Parameters:

Specification code ZX 30-50 ZX 30—100
Measuring range, mm 0 to 50 0 to 100
Minimum reading k, mm / F ≤0.02 ≤0.04
Temperature measurement range, ℃ -25 to +60 -25 to +60
Temperature measurement accuracy, ℃ ± 0.5 ± 0.5
Temperature correction factor b, mm / ℃ ≈0.002 ≈0.002
Insulation resistance MΩ ≥50 ≥50

Precautions:
The displacement sensors of the multi-point displacement meter are calibrated and qualified when they leave the factory. When the user does not find any abnormal conditions, no further calibration is required. If a sensor is found to be damaged or abnormal, it can be guided by the professional and technical personnel of the manufacturer Check or replace the sensor.
After the displacement meter is installed and positioned, the initial value of the instrument should be measured in time. Records should be made and archived according to the instrument number and design number, and the lead cables of the instrument should be strictly protected.
ZX30 vibrating wire multi-point displacement meter
Schematic diagram of four measuring point displacement meter
ZX30 vibrating wire multi-point displacement meter
(General) Calculation method:
a) When the external temperature constant displacement meter is only subjected to axial deformation, the displacement L and the output frequency modulus ΔF have the following linear relationship:
L = k △ F
△ F = F-F0
In the formula: k—the minimum reading of displacement measured by the displacement meter, the unit is mm / F;
△ F—The change amount of the real-time measured value of the displacement meter relative to the reference value, the unit is F;
F—the real-time measurement modulus value of the displacement meter, the unit is F;
F0—the reference modulus value of the displacement meter, the unit is F.
b) When the displacement meter is not affected by external force (the gauge distance at both ends of the instrument is not changed), and the temperature increases △ T, the displacement meter has an output △ F. This output is only caused by temperature changes. A deduction should be given in the calculation.
The experiment shows that △ F and △ T have the following linear relationship:
L = k △ F + b △ T = 0
k △ F = -b △ T
△ T = T-T0
In the formula: b—temperature correction coefficient of the displacement meter, the unit is mm / ℃;
△ T—The change amount of temperature real-time measured value from the reference value, the unit is ℃;
T—Real-time measurement of temperature, unit is ℃;
T0—reference value of temperature, unit is ℃.
c) The displacement meter embedded in the concrete structure or other structures is subject to the dual effects of deformation and temperature. Therefore, the general calculation formula of the displacement meter is:
Lm = k △ F + b △ T = k (F-F0) + b (T-T0)
In the formula: Lm—the amount of deformation of the structure under test, the unit is mm.
Note: The sensitive measuring element of the ZX3 vibrating wire displacement meter is very close to the linear expansion coefficient of the material of the fixed frame, so its temperature correction coefficient b is very small, so formula a can be used for general calculations.
Precautions:
The deformation observed by the displacement gauge is generally relatively large, so the sensor lead-out cable is particularly easy to be broken if it is improperly buried. Therefore, special attention should be paid to the reasonably buried lead-out cable when it is buried. Tighten this section of cable.
The bed leveling method and compaction requirements for placing the sensor: the trench excavation depth is 1.0-1.2m (the upper limit for the depth of the coarse-grained dam body). For coarse-grained dams, the foundation bed must be manually compacted and leveled in the form of a transition layer. For fine-grained dams, over-digging should be avoided. Secondly, a concrete base bed with a thickness of about 10 cm is poured at the position where the displacement meter is buried, and the level of the sensor is calibrated with a spirit level. The allowable deviation of unevenness is ± 2 mm. The slope of the pipeline foundation bed is 1% -3% (the upper limit is expected when the measurement point and the settlement along the line are large), and a 10cm thick reinforced mesh concrete is placed around the sensor to protect the site. The coarse-grained dam body is manually compacted and backfilled with a transition layer in the form of a transition layer, and the fine-grained dam body is backfilled with the original dam material. After manual compaction, construction can be performed as normal.
After the displacement meter is installed and buried, the initial reading should be measured in time. Generally before the burial, the instrument is placed in the installation position, after backfilling the protective layer and when the burial is resumed, the normal filling construction should be measured, and the correct initial reading should be selected to participate in the calculation. The measured displacement is divided by the distance between the anchor plates to obtain the strain value.
For any method of embedding and installing a displacement meter, the initial position of the displacement meter rod must be adjusted to meet the needs of measuring displacement in both tension and compression.
After the installation of the cable is completed, the cables are led out in a concentrated manner, and the cable is fixed according to the design direction. Record and archive according to the instrument number and design number, and strictly protect the lead-out cable of the instrument.

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