CN102146648B - High-speed railway structure settlement monitoring device and monitoring method - Google Patents

Abstract

The invention discloses a high-speed railway structure settlement monitoring device and a monitoring method. The upper part of the liquid reservoir of the device is provided with a sealing cover, the middle and lower parts of the liquid reservoir are equipped with pressure transmission fluid, and the upper part of the liquid reservoir passes through the connection between the air pipe and the pressure transmitter. The pressure inlet end is connected to one, the lower part of the liquid reservoir is connected to the pressure inlet end two of the pressure transmitter through the pressure transmission tube, the electrical signal output end of the pressure transmitter is electrically connected to the data acquisition and transmission system, and the data acquisition and transmission system is connected to the control Center Communications. The device of the invention has the advantages of simple structure, high precision and convenient operation, and can realize long-term automatic monitoring of settlement of high-speed railway structures in bad environment areas.

Description

A high-speed railway structure settlement monitoring device and monitoring method

technical field

The invention belongs to the field of surveying and mapping science and technology, in particular to a settlement monitoring device and a monitoring method for high-speed railway structures.

Background technique

my country's railways are developing by leaps and bounds. New high-speed passenger dedicated lines and reconstruction of existing railways are in the ascendant. High-speed driving requires the line structure to provide a track system with high ride comfort. How to accurately monitor the settlement and deformation of structures has become a key technical issue for high-speed railways.

There are two main types of traditional settlement deformation monitoring methods: one is the conventional measurement method (geodetic method and photogrammetry method); the other is the physical sensor method. Conventional measurement methods have the advantages of high measurement accuracy and reliable data, but they also have disadvantages such as large observation workload, low efficiency, great influence of climate, difficult to realize continuous and automatic monitoring, and require communication between monitoring points and base points. Physical sensors such as: sedimentation test instruments, such as profile sedimentation meters, magnetic ring sedimentation meters, electric rod-type sedimentation meters, etc., have the advantages of small size, long life, simple measurement methods, and reliable data collection. However, its observation workload is large, its anti-vibration ability is low, it is greatly affected by climate, and it is difficult to realize continuous and automatic monitoring, and it is difficult to meet the requirements of passenger dedicated line settlement observation in terms of accuracy. Although electronic levels and total stations can accurately test the settlement and deformation of foundation buildings, ground reference points need to be set, and they are greatly affected by climate and environmental factors, which seriously affect the accuracy of on-site testing.

To sum up, it is necessary to develop an accurate testing device and method that is high-precision, less affected by the environment, simple in testing methods, and capable of satisfying the settlement deformation of structures.

Contents of the invention

The purpose of the present invention is to provide a high-speed railway structure settlement monitoring device, which can realize the automatic continuous monitoring of high-speed railway structure settlement. monitor.

The technical scheme adopted by the present invention to realize the purpose of the invention is: a high-speed railway structure settlement monitoring device, which is characterized in that: the upper part of the liquid reservoir has a sealing cover, the middle and lower part of the liquid reservoir is equipped with pressure transmission fluid, and the upper part of the liquid reservoir The air pipe is connected to the pressure inlet port 1 of the pressure transmitter, the lower part of the liquid reservoir is connected to the pressure inlet port 2 of the pressure transmitter through the pressure transmission tube, and the electrical signal output port of the pressure transmitter is connected to the data acquisition and transmission system electrical circuit Connection, data acquisition and transmission system communicates with the control center.

The second object of the present invention is to provide a method for monitoring the settlement of a high-speed railway using the above-mentioned settlement monitoring device.

The technical solution adopted by the present invention to realize its second object of the invention is: a method for using the above-mentioned settlement monitoring device to carry out settlement monitoring of high-speed railways, the steps are as follows:

A. Device installation: Fix the bottom of the liquid reservoir on the settlement surface to be measured with expansion screws, and fix the pressure transmitter on the reference pile or zero settlement;

B. Monitoring: First, the data acquisition and transmission system and the control center read the initial electrical signal reading R ₀ of the pressure transmitter; during the monitoring process, continuously read the electrical signal reading R _i of the pressure transmitter, and the subscript i is the data The serial number of the read times;

C. Calculation of the height of the settlement surface to be measured:

When the pressure transmitter is a linear sensor, the height value S _i of the subsidence surface to be measured corresponding to the i-th reading is: S _i =kR _i +b, where k and b are the approximate values of the first-order term and the constant term, respectively. The fitting coefficient is determined by indoor instrument calibration, and is the fitting coefficient, which is determined by indoor instrument calibration;

k₂、k₁、b二次项、一次项和常数项的拟合系数，均通过室内仪器标定实验并利用最小二乘法确定；When the pressure transmitter is a nonlinear sensor, the height value _Si of the settlement surface to be measured corresponding to the i-th reading is:

The fitting coefficients of k ₂ , k ₁ , b quadratic term, first-order term and constant term are all determined by the least squares method through indoor instrument calibration experiments;

D. Obtain the settlement value of the settlement surface to be measured

The settlement value Δh _i of the settlement surface to be measured corresponding to the i-th reading is obtained by the following formula:

Δh _i =I _ti S _i -I _t0 S ₀

In the formula, I _ti is the total correction coefficient corresponding to the temperature ti at the i-th reading, I _ti =span{I _mti , I _lti , I _yti }; I _mti , I _lti , I _yti are respectively the i-th reading The liquid density correction coefficient, pipeline length correction coefficient and pressure transmitter no-load correction coefficient corresponding to the temperature ti, span {I _mti , I _lti , I _yti } is the linearity spanned by I _mti , I _lti , and I _yti space;

E. Data processing:

The control center will store the settlement value Δh _i of the subsidence surface to be measured each time, and draw the displacement time history curve of the subsidence surface to be measured after processing.

Compared with prior art, the beneficial effect of the present invention is:

1. According to the principle that the liquid pressure is directly proportional to the height of the liquid level, when the pressure transmitter is fixed on the reference pile, the vertical position of the reference pile is fixed, and the liquid reservoir fixed on the settlement surface to be measured changes with the settlement surface. Settling together, the height difference between the liquid level of the liquid reservoir and the pressure transmitter also changes accordingly, that is, the hydraulic pressure introduced from the pressure introduction port 2 of the pressure transmitter changes. And the pressure inlet end of the pressure transmitter introduces a sealed gas pressure, which remains unchanged. The pressure transmitter detects the change of the pressure difference between the two ends, and outputs an electrical signal reading accordingly. After the electric signal reading is corrected by factors such as calibration, fitting and temperature, the settlement value of the settlement surface to be measured can be accurately obtained. Therefore, the present invention cleverly utilizes the vertical position change between the pressure transmitter and the sealed liquid reservoir to realize the continuous automatic outdoor monitoring of the settlement surface.

2. The device realizes the settlement monitoring of the railway settlement surface through the settlement of the liquid surface of the sealed container, and minimizes the interference of the external environment. At the same time, through the correction and compensation of the temperature, the settlement test of the present invention is more accurate and reliable. Up to 0.01mm.

3. The sensing part of the device is only composed of a liquid reservoir, a pressure transmitter and connecting pipelines. It has a simple structure, low manufacturing cost, easy maintenance, and stable and reliable operation.

4. Due to the temperature compensation mechanism, the present invention can be applied to the settlement test in areas with high temperature difference. When the pressure transmission fluid is antifreeze, it can be used in high cold areas. It can realize accurate test of settlement in harsh environment areas.

5. The test range is adjustable and the range is large. The range can be adjusted by controlling the height difference of the initial installation liquid level, or by adjusting the parameters of the pressure transmitter to achieve the purpose of controlling and adjusting the range.

6. The test method is simple, continuous and automatic, and has good stability. The test signal is transmitted to the indoor control center, which can realize unmanned long-term automatic remote monitoring of the settlement of high-speed railway structures.

The above-mentioned pressure transmitter is installed in the protective cover. This further reduces external interference and influence on the test, improves the test accuracy, and also improves the service life of the pressure transmitter.

A sealing ring is provided between the above-mentioned sealing cover and the liquid reservoir.

Silicone oil is added to the surface of the above-mentioned pressure transmission fluid. In this way, the evaporation of the pressure transmission fluid can be reduced, the maintenance cost of the device can be reduced, and the maintenance frequency of the device can be reduced.

The above-mentioned pressure transmission fluid is distilled water or antifreeze. In this way, the use of distilled water for normal temperature monitoring can reduce costs, and the use of antifreeze can be used for monitoring in alpine regions.

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed ways

Figure 1 shows that a specific embodiment of the present invention is a high-speed railway structure settlement monitoring device, which is characterized in that: the upper part of the liquid reservoir 9 has a sealing cover 5, and the middle and lower part of the liquid reservoir 9 is equipped with a pressure transmission fluid 8. The upper part of the liquid reservoir 9 is connected to the pressure introduction end 1 of the pressure transmitter 4 through the gas pipe 2, and the lower part of the liquid reservoir 9 is connected to the pressure introduction end 2 of the pressure transmitter 4 through the pressure transmission tube 3, and the pressure transmission The electrical signal output terminal of the device 4 is electrically connected with the data acquisition and transmission system 15, and the data acquisition and transmission system 15 communicates with the control center 16.

The communication between the data acquisition system and the control center can be carried out by wire or wirelessly. For example, the mature GPRS wireless communication method can be used.

The pressure transmitter 4 of this example is installed in the protective cover 11 . A sealing ring 6 is provided between the sealing cover 5 and the liquid reservoir 9 .

The surface of the pressure transmission fluid 8 in this example is filled with silicone oil 7 . The pressure transmission fluid 8 is distilled water or antifreeze.

A kind of method that uses above-mentioned settlement monitoring device to carry out settlement monitoring to high-speed railway, its steps are as follows:

A. Device installation: fix the bottom of the liquid reservoir 9 on the settlement surface 18 to be measured with expansion screws, and fix the pressure transmitter on the reference pile 17 or zero settlement;

B. Monitoring: First, the data acquisition and transmission system 15 and the control center read the initial electrical signal reading R ₀ of the pressure transmitter 4; during the monitoring process, continuously read the electrical signal reading R _i of the pressure transmitter 4, subscript i is the serial number of the number of data reads;

C. Calculation of the height of the settlement surface to be measured:

When the pressure transmitter is a linear sensor, the height value S _i of the subsidence surface to be measured corresponding to the i-th reading is: S _i =kR _i +b, where k and b are the approximate values of the first-order term and the constant term, respectively. The fitting coefficient is determined by indoor instrument calibration, and is the fitting coefficient, which is determined by indoor instrument calibration;

k₂、k₁、b二次项、一次项和常数项的拟合系数，均通过室内仪器标定实验并利用最小二乘法确定；When the pressure transmitter is a nonlinear sensor, the height value _Si of the settlement surface to be measured corresponding to the i-th reading is:

The fitting coefficients of k ₂ , k ₁ , b quadratic term, first-order term and constant term are all determined by the least squares method through indoor instrument calibration experiments;

D. Obtain the settlement value of the settlement surface to be measured

The settlement value Δh _i of the settlement surface to be measured corresponding to the i-th reading is obtained by the following formula:

Δh _i =I _ti S _i -I _t0 S ₀

In the formula, I _ti is the total correction coefficient corresponding to the temperature ti at the i-th reading, I _ti =span{I _mti , I _lti , I _yti }; I _mti , I _lti , I _yti are respectively the i-th reading The liquid density correction coefficient, pipeline length correction coefficient and pressure transmitter no-load correction coefficient corresponding to the temperature ti, span {I _mti , I _lti , I _yti } is the linearity spanned by I _mti , I _lti , and I _yti space;

E. Data processing:

The control center will store the settlement value Δh _i of the subsidence surface to be measured each time, and draw the displacement time history curve of the subsidence surface to be measured after processing, that is, the settlement time curve.

When the present invention is implemented, in order to better reduce external influences such as temperature, the pressure transmission pipe 3 can be buried in the soil.

The pressure transmitter 4 used in the present invention can adopt various existing pressure transmitters. If the SE133 pressure transmitter can be selected, the working principle of the transmitter is: using the piezoresistive effect of the semiconductor and the micro-machining technology, on the specific crystal direction of the single crystal silicon wafer, a whiis is made by the diffused semiconductor process. Board the bridge to form a sensitive diaphragm. When subjected to external force, micro-strain is generated, and the resistivity changes, so that the resistance of the bridge arm changes (one pair becomes larger and the other becomes smaller). The excitation voltage signal is output. After computer temperature compensation, laser Adjustment of resistance, signal amplification and other processing methods and strict assembly testing, calibration and other processes produce standard output signals.

During implementation, all joints are treated with waterproofing, and in order to realize long-term monitoring, the appearance of the device needs to be treated with anti-corrosion.

Claims (6)

1. high-speed railway works settlement monitoring device, it is characterized in that: gland bonnet (5) is arranged at reservoir (9) top, and pressure transmission liquid (8) is equipped with in reservoir (9) middle and lower part; Reservoir (9) top links to each other with the pressure leading-in end one of pressure unit (4) through tracheae (2), and the bottom of reservoir (9) links to each other with the pressure leading-in end two of pressure unit (4) through pressure tube (3); The electrical signal of pressure unit (4) is electrically connected with data collection and transfering system (15), data collection and transfering system (15) and control center (16) communication.

2. a kind of high-speed railway works settlement monitoring device as claimed in claim 1, it is characterized in that: described pressure unit (4) is installed in the protective cover (11).

3. a kind of high-speed railway works settlement monitoring device as claimed in claim 1 is characterized in that: be provided with O-ring seal (6) between described gland bonnet (5) and the reservoir (9).

4. a kind of high-speed railway works settlement monitoring device as claimed in claim 1 is characterized in that: described pressure transmission liquid (8) surface filling silicone oil (7).

5. a kind of high-speed railway works settlement monitoring device as claimed in claim 1, it is characterized in that: described pressure transmission liquid (8) is distilled water or anti freezing solution.

6. one kind is used the described high-speed railway works of claim 1 settlement monitoring device that the high-speed railway works is carried out the method for settlement monitoring, and its step is following:

A, device are installed: described reservoir (9) bottom is fixed on the sedimentation face to be measured (18) with setscrew, and pressure unit is fixed on reference stake (17) or zero sedimentation place;

B, monitoring: at first data collection and transfering system (15) and control center read the initial electrical signal reading R of pressure unit (4) ₀In observation process, read the electric signal reading R of pressure unit (4) continuously _i, subscript i is the sequence number of data reading times;

C, sedimentation face height calculation to be measured:

When pressure unit is linear transducer, the height value S of the sedimentation face to be measured of the i time reading correspondence _iFor: S _i=kR _i+ b, in the formula, k, b are respectively once the fitting coefficient of item and constant term, confirm through indoor instrumental calibration;

When pressure unit is nonlinear transducer, the height value S of the sedimentation face to be measured of the i time reading correspondence _iThen be:

k ₂, k ₁, b quadratic term, once and the fitting coefficient of constant term, all through indoor instrumental calibration experiment and utilize least square method to confirm;

D, draw the sedimentation value of sedimentation face to be measured:

The sedimentation value Δ h of the sedimentation face to be measured of the i time reading correspondence _i, draw by following formula:

Δh _i＝I _tiS _i-I _t0S ₀，

In the formula, I _TiTotal correction factor that temperature t i when being the i time reading is corresponding, I _Ti=span{I _Mti, I _Lti, I _Yti; I _Mti, I _Lti, I _YtiThe unloaded correction factor of the pairing fluid density correction factor of temperature t i when being respectively the i time reading, pipeline length correction coefficient and pressure unit, span{I _Mti, I _Lti, I _YtiBe I _Mti, I _Lti, I _YtiThe linear space of opening;

E, data processing:

Control center will store the sedimentation value Δ h of the sedimentation face to be measured that at every turn monitors _i, and the displacement time-history curves of the sedimentation face to be measured that draws after handling.

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