CN205262461U - Big depth displacement in tunnel subsides measurement system - Google Patents

Abstract

The utility model discloses a large elevation difference settlement measurement system for a tunnel, which comprises a liquid source water tank filled with liquid, more than one liquid pressure sensor, and a connecting pipe connecting the liquid source water tank and each liquid pressure sensor; the above-mentioned liquid pressure sensors It includes a shell and more than one stroke difference block; the part connecting the connecting pipe at the bottom of the shell is defined as a liquid port, and the liquid port is connected with an exhaust valve; the inner bottom of the shell and the top of the liquid port are covered with elastic pressure-sensitive elements, and the process The differential block is placed on the elastic pressure sensitive element. The utility model utilizes the pressure compensation means to make the liquid pressure sensor need not be adjusted to be consistent with the liquid level when the settlement measurement is carried out in an environment with limited internal space such as a tunnel, which reduces the transmission of too much relative reference and is not limited by the elevation of the measurement point. , reducing the difficulty of measurement.

Description

A Settlement Measuring System for Tunnel with Large Elevation Difference

technical field

The utility model relates to the technical field of tunnel settlement measurement, in particular to a large elevation difference settlement measurement system for tunnels.

Background technique

Settlement monitoring is an important monitoring content in building deformation monitoring. Settlement monitoring uses reasonable instruments and methods to measure the elevation change of the building in the vertical direction, which is reflected by the settlement of the monitoring points. Regularly and accurately measure the settlement of the monitoring points, the cumulative settlement, settlement difference, and average settlement rate of the monitoring points can be calculated, and the trend can be analyzed and predicted, and the local relative inclination and deflection can be further calculated.

Precision leveling has high precision and simple method, and is the most commonly used method for settlement monitoring. This method is less affected by the observation environment, but affected by human measurement, it can only be used for regular manual measurement. Conventionally, there are precision levels, electronic levels, and rulers corresponding to grade requirements. In view of the poor line condition of the leveling route, the implementation of leveling survey will become very difficult. The precise triangular elevation survey using electromagnetic wave distance measurement is applied in the settlement survey. It is also affected by man-made surveys and can only be used for regular manual surveys. The above two The technology is basically based on the comparison of measurements before and after construction, and is suitable for the measurement of large settlements, as well as regular measurements in the later period, which cannot meet the requirements of automatic real-time monitoring in the later period.

The static level measurement of the liquid is also called the communication pipe measurement, which is a method of measuring the height transfer by using the liquid level when it is connected to each other and the static force is balanced. The feature of using a static level is that it can be measured in real time, which is very suitable for small-scale measurement after the building is completed and stabilized. However, when laying out each static level, the liquid level must be consistent. For the environment with a large elevation difference, multiple static levels are required. Make benchmark transfers.

At present, the real-time on-line detection of tunnel settlement is usually done by static levels, and connecting pipes are used to connect the static levels so that the liquid levels of the static levels are consistent. However, due to the complex geological structure in the tunnel, large elevation fluctuations, and limited internal space, it is difficult to satisfy the level of each liquid level at the same level, and for tunnels with a distance of more than 100 meters, it is necessary to deploy multiple static levels. The facility structure is complex, the project implementation is difficult to increase, and the measurement accuracy is low.

Utility model content

The technical problem to be solved by the utility model is: when measuring the settlement of an environment with limited internal space such as a tunnel, the pressure compensation method is used to make the liquid pressure sensor need not be adjusted to the same height of the liquid level, so as to reduce the transmission of too much relative reference, At the same time, it is not limited by the elevation of the measurement point, reducing the difficulty of measurement.

The technical solution adopted by the utility model is specifically: a large elevation difference settlement measurement system for tunnels, including a liquid source water tank filled with liquid, more than one liquid pressure sensor, and a connecting pipe connecting the liquid source water tank and each liquid pressure sensor;

Each of the above-mentioned liquid pressure sensors includes a shell and more than one stroke difference block; the part where the bottom of the shell is connected to the communication pipe is defined as the liquid port, and the liquid port is connected with an exhaust valve; the inner bottom of the shell and the top of the liquid port are covered with elastic For the pressure sensitive element, the stroke difference block is placed on the elastic pressure sensitive element.

The design principle of the utility model is as follows: the pressure difference between the upper and lower sides of the elastic pressure sensitive element is compensated by placing a stroke difference block on the elastic pressure sensitive element, so that in the process of settlement measurement, the placement of the sensor does not need to wait for the liquid surface to be installed, and it can be applied to large Relative settlement measurements of elevation differences in environments. The step difference block described in the utility model is a block with a certain quality, and the number of the step difference block can be set to multiple. When the liquid pressure sensor is arranged, the additional pressure generated by the liquid height difference is offset by placing the step difference block. The upper and lower pressures of the elastic pressure sensitive element are in a balanced state. During measurement, when there is settlement at a certain point, the liquid height difference of the liquid pressure sensor at this point relative to the liquid source tank will change. At this time, if the pressure difference between the upper and lower elastic pressure sensitive elements changes, the corresponding pressure difference signal will be output, which can be further improved. Get the amount of sedimentation. The elastic pressure sensitive element can adopt existing products, such as capacitive, resistive, optical and other pressure sensors extended on the basis of elastic diaphragms.

When the elevation difference between the liquid source at a high place and the pressure sensor at a certain place is H, and N height difference blocks (mass is m) are added to the pressure sensor, the upper and lower pressure difference at the sensitive element is ρgH-Nmg/ S, where S is the pressure-receiving area of the elastic pressure-sensitive element. When the elevation of the pressure sensor sinks by ΔH, the pressure difference between the upper and lower sides of the sensitive element is ρg(H+ΔH)-Nmg/S. It can be seen that the pressure There is a corresponding relationship between the signal change output by the sensitive element and the settlement amount, and the settlement amount can be obtained by detecting the pressure difference signal output by the elastic pressure sensitive element.

The quality of the range difference block in the utility model can be set as required, and the minimum range difference between two adjacent liquid pressure sensors is defined as h, the pressure-bearing area of the elastic pressure sensitive element is s, and ρ is the density of the liquid. The mass m of the stroke difference block is: m=ρhS. In order to maintain the consistency of the product, each liquid pressure sensor can be arranged according to the integral multiple of the minimum height difference h set above, so that the height difference between each liquid pressure sensor and the liquid source tank is the minimum height difference. Integer multiples of the difference h, that is, only by increasing or decreasing multiple stroke difference blocks of the same mass, the upper and lower pressures of the elastic pressure sensitive elements in each liquid pressure sensor are balanced.

Further, the elastic pressure-sensitive element in the utility model can be sealed by welding, adhesion, etc., in order to make the seal more reliable, the lower part of the elastic pressure-sensitive element is evenly pressed, and the elastic pressure-sensitive element covers the inner bottom surface of the housing; at the same time, in order to make the elastic The upper part of the pressure sensitive element is evenly pressed, and the stroke difference block is plate-shaped with uniform thickness, covering the elastic pressure sensitive element above the liquid opening.

The beneficial effects of the utility model are: through the increase and decrease of the stroke difference block to balance the change of the liquid level height caused by the elevation difference, when the liquid pressure sensor is arranged, it is not necessary to set the internal liquid height of each liquid pressure sensor on the same horizontal plane, which is difficult to install It is greatly reduced and is not limited by the elevation of the measurement point. It is very convenient to use in relative settlement with large elevation difference.

Description of drawings

Figure 1 shows a schematic diagram of the system structure of the utility model.

detailed description

It will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the large elevation difference settlement measurement system for tunnels of the present invention includes a liquid source water tank 1 filled with liquid, more than one liquid pressure sensor 2, and a connection between the liquid source water tank 1 and each liquid pressure sensor 2 pipe; the connecting pipe is provided with a drain valve 3 .

Each of the above-mentioned liquid pressure sensors 2 includes a housing 21 and more than one stroke block 23; the position where the bottom of the housing 21 is connected to the communication pipe is defined as a liquid port, and the liquid port is connected to an exhaust valve 22; the inner bottom of the housing 21, An elastic pressure sensitive element 24 is sealed and fixed above the liquid opening, and the stroke difference block 23 is placed on the elastic pressure sensitive element 24 .

Example

The distance difference block is a block with a certain quality, the number of the distance difference blocks is set to be multiple, the quality of the distance difference block can be set directly or as required, and the minimum distance difference between the liquid pressure sensors is defined as h, The pressure-bearing area of the elastic pressure-sensitive element is s, ρ is the density of the liquid, and the mass m of the above-mentioned difference block is: m=ρhS. In order to maintain the consistency of the product, each liquid pressure sensor can be set according to the integral multiple of the above-mentioned minimum stroke difference h when arranging the position, that is, only by increasing or decreasing multiple stroke difference blocks of the same mass, so that each liquid pressure The upper and lower pressure of the elastic pressure sensitive element in the sensor is balanced.

In order to make the sealing of the elastic pressure sensitive element more reliable and the pressure on the lower part of the elastic pressure sensitive element to be more uniform, the elastic pressure sensitive element covers the inner bottom surface of the housing in this embodiment; at the same time, in order to make the upper part of the elastic pressure sensitive It is in the shape of a plate with uniform thickness, covering part of the elastic pressure-sensitive element above the liquid port.

The design principle of the utility model is as follows: the pressure difference between the upper and lower sides of the elastic pressure sensitive element is compensated by placing a stroke difference block on the elastic pressure sensitive element, so that in the process of settlement measurement, the placement of the sensor does not need to wait for the liquid surface to be installed, and it can be applied to large Relative settlement measurements of elevation differences in environments. When the liquid pressure sensor is arranged, the increase or decrease of the liquid pressure is counteracted by increasing or decreasing the stroke difference block, so that the upper and lower pressures of the elastic pressure sensitive element are in a balanced state. When measuring, when there is settlement at a certain point, the liquid height difference of the liquid pressure sensor at this point relative to the liquid source tank will change. At this time, the pressure difference between the upper and lower elastic pressure sensitive elements will output a corresponding signal. After detecting the pressure difference signal The settlement amount can be obtained by compensating the signal in the equilibrium state.

Claims (4)

1. A large elevation difference settlement measurement system for tunnels, characterized in that it comprises a liquid source water tank filled with liquid, more than one liquid pressure sensor, and connecting pipes connecting the liquid source water tank and each liquid pressure sensor; Each of the above-mentioned liquid pressure sensors includes a shell and more than one stroke difference block; the part where the bottom of the shell is connected to the communication pipe is defined as the liquid port, and the liquid port is connected with an exhaust valve; the inner bottom of the shell and the upper part of the liquid port are sealed and fixed elastically For the pressure sensitive element, the stroke difference block is placed on the elastic pressure sensitive element. 2. The tunnel large elevation difference settlement measurement system according to claim 1, wherein the minimum elevation difference between adjacent liquid pressure sensors is defined as h, the pressure-bearing area of the elastic pressure sensitive element is S, and ρ is liquid density, the mass m of the difference block is: m=ρhS. 3. The tunnel settlement measurement system with large elevation difference according to claim 1, characterized in that the elastic pressure-sensitive element covers the inner bottom surface of the casing. 4. The tunnel settlement measurement system with large elevation difference according to claim 1, characterized in that the elevation difference block is plate-shaped with uniform thickness and covers the elastic pressure-sensitive element above the liquid opening.