CN115979918A - A vibrating wire piezometer suitable for use in cold environments and its application method - Google Patents

Abstract

The present application discloses a vibrating wire piezometer suitable for use in cold environments and a method of use, wherein the vibrating wire piezometer includes a hollow shell with openings at both ends, and the hollow shell includes: The water-permeable mechanism is set at one end of the hollow shell, and is used to permeate water into the hollow shell to form the penetrating water pressure; the pressure sensing mechanism is set in the hollow shell; the isolation mechanism is set in the hollow shell, and uses It is used to isolate the permeable mechanism and the pressure sensing mechanism, feel the pressure of the permeating water, and transmit the pressure of the permeating water to the pressure sensing mechanism; the circuit connection mechanism, which is electrically connected to the pressure sensing mechanism, is located at the other end of the hollow shell; the sealing mechanism is used for The sealed circuit connection mechanism and the other end of the hollow housing. When the application is applied to low-temperature frozen soil environment, it can effectively protect the pressure sensing mechanism and improve the measurement accuracy of the vibrating wire piezometer.

Description

A vibrating wire piezometer suitable for use in cold environments and its application method

technical field

The invention relates to the technical field of piezometers, in particular to a vibrating wire piezometer suitable for use in cold environments and a use method thereof.

Background technique

At present, in roadbeds, reservoirs and dams, in order to ensure the safety of engineering construction, it is necessary to monitor the seepage water pressure of the soil. In practice, the vibrating wire piezometer is usually used to monitor the seepage water pressure. The vibrating wire piezometer is buried inside the structure or soil to monitor the seepage water pressure for a long time.

However, the existing vibrating wire piezometer is mainly used in the normal temperature environment, and it is difficult to adapt to the low temperature frozen soil environment. According to the description of the 0003-0004 paragraph of the Chinese patent CN102879148A specification, it can be known that the liquid (ie water) in the frozen soil pores passes through the filter 11 enters the cavity 12, the liquid pressure directly acts on the pressure sensing membrane 13, the water in the cavity 12 will freeze, and the volume of the water will expand after freezing and squeeze the pressure sensing membrane 13, resulting in pressure The sensing membrane 13 produces mechanical deformation. It can be seen that when the vibrating wire piezometer is in a freezing environment, its protection is poor. The water between the filters 11) of the patent CN102879148A freezes to cause frost heave, which causes mechanical deformation and other damage to the pressure-bearing diaphragm at the front end that senses pressure, resulting in permanent failure of the vibrating wire piezometer.

In addition, when the vibrating wire piezometer is applied to the low-temperature frozen soil environment, it is easily affected by the frost heave caused by the freezing of low-temperature water, which reduces its measurement accuracy.

Contents of the invention

The embodiments of the present application provide a vibrating wire piezometer suitable for use in cold environments and a method of use, which can be applied to cold environments and solve the problem that conventional vibrating wire piezometers cannot work stably for a long time in low-temperature frozen soil environments This ensures the long-term effectiveness of water seepage pressure monitoring in low temperature permafrost environment.

Other features and advantages of the present application will become apparent from the following detailed description, or in part, be learned by practice of the present application.

According to the first aspect of the embodiments of the present application, there is provided a vibrating wire piezometer suitable for use in cold environments, comprising a hollow shell with openings at both ends, and the hollow shell includes:

The water-permeable mechanism is arranged at one end of the hollow shell, and is used to permeate water into the hollow shell to form a penetrating water pressure;

The pressure sensing mechanism is set in the hollow shell;

The isolation mechanism is set in the hollow shell and is used to isolate the permeable mechanism and the pressure sensing mechanism, sense the pressure of the permeable water, and transmit the pressure of the permeable water to the pressure sensing mechanism;

The circuit connection mechanism, electrically connected to the pressure sensing mechanism, is located at the other end of the hollow shell;

The sealing mechanism is used for sealing the circuit connection mechanism and the other end of the hollow shell.

In some embodiments of the present application, based on the aforementioned solutions, the pressure sensing mechanism includes:

The pressure-bearing diaphragm is used to feel the osmotic water pressure transmitted by the isolation mechanism;

Steel strings for transmitting the permeate water pressure received by the pressure-bearing membrane;

The pressure sensor is used to detect the frequency of the steel string to detect the change of the pressure of the seepage water, and is electrically connected to the circuit connection mechanism.

In some embodiments of the present application, based on the aforementioned solution, the isolation mechanism includes:

a flexible membrane for forming a pressure chamber, the pressure chamber is located between the flexible membrane and the water permeable mechanism;

A conduction chamber, formed between the flexible membrane and the pressure sensing mechanism, is filled with a heat transfer fluid.

In some embodiments of the present application, based on the foregoing solutions, the hollow housing includes:

The lightning protector is electrically connected to the pressure sensing mechanism and the hollow shell.

In some embodiments of the present application, based on the aforementioned solutions, the water-permeable mechanism includes:

The permeable stone is arranged at one end of the hollow shell.

In some embodiments of the present application, based on the foregoing solution, the circuit connection mechanism includes:

The waterproof circuit connector is set in the hollow shell, one end is electrically connected to the pressure sensing mechanism, and the other end is electrically connected to the cable;

The cable extends out of the hollow shell, and the space between the cable and the waterproof circuit connector is sealed by a sealing mechanism.

In some embodiments of the present application, based on the foregoing solution, the sealing mechanism uses a filling sealing material to seal the space between the cable and the waterproof circuit connector.

In some embodiments of the present application, based on the foregoing solutions, the sealing mechanism includes:

The waterproof joint is arranged at the other end of the hollow shell and sleeved on the outside of the cable for fixing the cable.

In some embodiments of the present application, based on the foregoing solutions, the hollow housing includes:

The temperature detecting mechanism is arranged in the hollow casing and is electrically connected to the circuit connecting mechanism.

In some embodiments of the present application, the isolation mechanism isolates the pressure sensing mechanism from the water permeable mechanism, avoiding direct contact between the pressure sensing mechanism and the water penetrating into the hollow shell. When the vibrating wire piezometer is applied In the low-temperature frozen soil environment, the pressure sensing mechanism can reduce the influence of low-temperature water, avoid the frost heaving of the pressure sensing mechanism due to low temperature, effectively protect the pressure sensing mechanism, and improve the performance of the piezometer in the low-temperature frozen soil environment. measurement accuracy.

According to the second aspect of the embodiments of the present application, there is provided a method for using a vibrating wire piezometer suitable for use in a cold environment, the method comprising:

burying the vibrating wire piezometer inside a structure or soil;

The water inside the structure or soil penetrates into the hollow shell through the permeable mechanism to form the seepage water pressure;

The isolation mechanism senses the pressure of the seepage water, transmits the pressure of the seepage water to the pressure sensing mechanism, and isolates the pressure sensing mechanism from the water penetration mechanism;

The pressure sensing mechanism detects the osmotic water pressure transmitted by the isolation mechanism, obtains the detection result, and transmits the detection result through the circuit connection mechanism.

For the beneficial effects of the above-mentioned second aspect, reference may be made to the above-mentioned first aspect and the beneficial effects of the various embodiments of the first aspect, which will not be repeated here.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application. Apparently, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative efforts. In the attached picture:

Fig. 1 shows a schematic structural view of a vibrating wire piezometer suitable for use in a cold environment in an embodiment of the present application;

Fig. 2 shows a flow chart of a method of using a vibrating wire piezometer suitable for use in cold environments in an embodiment of the present application.

Reference signs: 1-permeable stone, 2-pressure chamber, 3-flexible membrane, 4-heat transfer fluid, 5-isolating mechanism, 6-pressure-bearing diaphragm, 7-steel string, 8-pressure sensor, 9- Pressure sensing mechanism, 10-lightning protector, 11-hollow shell, 12-thermistor thermometer, 13-waterproof circuit connector, 14-cable, 15-epoxy resin, 16-waterproof connector.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be employed. In other instances, well-known methods, apparatus, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.

The flow charts shown in the drawings are only exemplary illustrations, and do not necessarily include all contents and operations/steps, nor must they be performed in the order described. For example, some operations/steps can be decomposed, and some operations/steps can be combined or partly combined, so the actual order of execution may be changed according to the actual situation.

In the description of the present application, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, unless otherwise specified, "plurality" means two or more.

It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. Unless otherwise clearly stated in the present invention, the singular form also includes the plural form. In addition, it should also be noted that when the terms "comprising" and/or "comprising" are used in this specification, it indicates that there are features, steps, operations, devices, components and/or combinations thereof.

For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the directions of up, down, left and right of the drawings themselves, and do not limit the structure. It is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Fig. 1 shows a schematic structural diagram of a vibrating wire piezometer suitable for use in a cold environment in an embodiment of the present application. Referring to Figure 1, the piezometer includes a hollow shell with two ends open, the hollow shell can be cylindrical or prismatic, the hollow shell can be made of stainless steel, and the shell includes a water-permeable mechanism , pressure sensing mechanism, isolation mechanism, circuit connection mechanism and sealing mechanism, the details are as follows:

The water-permeable mechanism is arranged at one end of the hollow shell, and is used for penetrating water into the hollow shell to form a penetrating water pressure.

In the present application, water can permeate into the hollow shell through the water-permeable mechanism, so that the detection components in the hollow shell can detect the pressure of the penetrating water.

The pressure sensing mechanism is arranged in the hollow casing.

In this application, the pressure sensing mechanism can be used to detect the pressure of osmotic water.

The isolation mechanism is arranged in the hollow shell and is used for isolating the water-permeable mechanism and the pressure sensing mechanism, sensing the pressure of the permeating water, and transmitting the pressure of the permeating water to the pressure-sensing mechanism.

In this application, the isolation mechanism can isolate the pressure sensing mechanism from the water permeable mechanism, avoiding direct contact between the water penetrating into the hollow shell and the pressure sensing mechanism. When the piezometer is applied to the low-temperature frozen soil environment, The pressure sensing mechanism can reduce the impact of low-temperature water, prevent the pressure sensing mechanism from frost heaving, effectively protect the pressure sensing mechanism, and improve the accuracy of the vibrating wire piezometer. The pressure of the permeated water is transmitted to the pressure sensing mechanism, which is convenient for the pressure sensing mechanism to detect the pressure of the permeated water.

The circuit connecting mechanism, electrically connected to the pressure sensing mechanism, is arranged at the other end of the hollow shell.

In this application, the circuit connection mechanism can transmit the detection result of the pressure sensing mechanism for convenient display or viewing.

The sealing mechanism is used for sealing the circuit connection mechanism and the other end of the hollow shell.

In the present application, the sealing mechanism is used to seal the other end of the hollow shell to prevent permeated water from entering the hollow shell from the other end of the hollow shell and causing damage to components in the hollow shell.

Continuing to refer to Fig. 1, the pressure sensing mechanism includes a pressure-bearing diaphragm, a steel string and a pressure sensor, which are described in detail as follows:

The pressure-bearing diaphragm is used to sense the permeate water pressure transmitted by the isolation mechanism.

In this application, the pressure-bearing diaphragm can be the diaphragm of an existing vibrating wire piezometer.

Steel strings for transmitting the permeate water pressure received by the pressure-bearing membrane.

In this application, the steel string can adopt the vibrating wire of the existing vibrating wire piezometer, so as to facilitate the transmission of the osmotic water pressure felt by the pressure-bearing diaphragm.

The pressure sensor is used to detect the frequency of the steel string to detect the change of the pressure of the seepage water, and is electrically connected to the circuit connection mechanism.

In the present application, the pressure sensor may include a receiving coil for sensing the vibration frequency of the steel string, so as to facilitate detection of the vibration frequency of the steel string, so as to detect the change of the seepage water pressure.

Since the osmotic water pressure does not directly act on the pressure-bearing diaphragm, damage to the pressure-bearing diaphragm by freezing and heaving of water is avoided, so that the vibrating wire osmometer has better self-protection performance and strength, and high reliability.

Continuing to refer to Figure 1, the isolation mechanism includes a flexible membrane and a conduction chamber, which are described in detail as follows:

A flexible membrane is used to form a pressure chamber, and the pressure chamber is located between the flexible membrane and the water-permeable mechanism.

In this application, the water that enters the hollow shell through the water-permeable mechanism is located in the pressure chamber to generate osmotic water pressure, and the flexible membrane feels the osmotic water pressure through the water in the pressure chamber. The flexible membrane can be a latex membrane, which has a sensitive deformation capability, improving the measurement accuracy of the vibrating wire piezometer.

A conduction chamber, formed between the flexible membrane and the pressure sensing mechanism, is filled with a heat transfer fluid.

In this application, the conduction chamber transmits the permeated water pressure felt by the flexible membrane to the pressure sensing mechanism, and the actual transmission is completed through the heat transfer fluid, which can serve as the medium for the permeated water pressure transmission, and the heat transfer fluid can be high and low temperature heat-conducting silicone oil .

Specifically, the conduction chamber transmits the osmotic water pressure felt by the flexible membrane to the pressure sensing mechanism, and it may be that the conduction chamber transmits the osmotic water pressure felt by the flexible membrane to the pressure-bearing diaphragm.

Due to the existence of the isolation mechanism, the vibrating wire piezometer can work stably for a long time in a low-temperature frozen soil environment, and can effectively observe the seepage water pressure for a long time.

Continuing to refer to Fig. 1, the hollow housing also includes:

The lightning protector is electrically connected to the pressure sensing mechanism and the hollow shell.

In this application, the lightning strike protector can be used to protect the pressure sensing mechanism. Specifically, when the pressure sensing mechanism is struck by lightning, it will be transmitted to the ground through the hollow shell to avoid damage to the pressure sensing mechanism during the lightning strike, so that The vibrating wire piezometer has good lightning strike resistance and electromagnetic interference resistance.

Continuing to refer to Fig. 1, the water permeable mechanism includes:

The permeable stone is arranged at one end of the hollow shell.

In this application, the permeable stone may be the permeable stone of the existing vibrating wire piezometer.

Continuing to refer to Figure 1, the circuit connection mechanism includes waterproof circuit connectors and cables, which are described in detail as follows:

The waterproof circuit connector is arranged in the hollow shell, one end is electrically connected to the pressure sensing mechanism, and the other end is electrically connected to the cable.

In this application, the waterproof circuit connector can isolate the pressure sensing mechanism in the hollow shell, avoid the pressure sensing mechanism from being affected by seepage water, and can transmit the detection result of the pressure sensing mechanism through the cable.

The cable extends out of the hollow shell, and the space between the cable and the waterproof circuit connector is sealed by a sealing mechanism.

In the present application, the cable is used to transmit data, that is, the detection result of the pressure sensing mechanism, and the cable may be a shielded cable, and the cable may be a four-core cable.

Continuing to refer to FIG. 1 , the sealing mechanism uses a filling sealing material to seal the space between the cable and the waterproof circuit connector.

Specifically, the sealing material may be epoxy resin.

Continue to refer to Fig. 1, described sealing mechanism comprises:

The waterproof joint is arranged at the other end of the hollow shell and sleeved on the outside of the cable for fixing the cable.

In this application, the waterproof joint can seal the other end of the hollow casing.

The waterproof joint and the sealing material work together to have a double sealing function, so that the vibrating wire piezometer has better sealing performance.

Continuing to refer to Fig. 1, the hollow housing includes:

The temperature detecting mechanism is arranged in the hollow casing and is electrically connected to the circuit connecting mechanism.

The temperature detecting mechanism may be a thermistor thermometer or a temperature sensor for the temperature inside the hollow shell.

In this embodiment, by adding an isolation mechanism, the pressure sensing mechanism is prevented from being damaged by frost heaving in the low-temperature frozen soil environment, the flexible membrane has high sensitivity, and the heat transfer fluid does not freeze in the low-temperature frozen soil environment, which jointly improves the The measurement accuracy of the vibrating wire piezometer.

In order to better understand the embodiments of the present application, specific examples are provided as follows:

The vibrating wire piezometer includes a hollow shell with openings at both ends, and the hollow shell is sequentially provided with a permeable stone, a flexible membrane, a pressure diaphragm, a steel string, a pressure sensor, and a lightning protector from one end to the other. , a thermistor thermometer, a waterproof circuit connector and a waterproof connector, the permeable stone and the waterproof connector are respectively arranged at both ends of the hollow shell, a pressure chamber is formed between the permeable stone and the flexible membrane, and the permeable water enters the pressure chamber through the permeable stone, The osmotic water pressure is formed, and the flexible membrane feels the osmotic water pressure and deforms. A conduction chamber is formed between the flexible membrane and the pressure-bearing diaphragm, and the conduction chamber is filled with a heat transfer fluid. The heat transfer fluid transmits the osmotic water pressure felt by the flexible membrane to the The pressure-bearing diaphragm, the pressure-bearing diaphragm deforms, and the pressure-bearing diaphragm transmits the pressure of the permeated water received to the steel string, causing the steel string to generate stress, and the vibration frequency of the steel string changes. The pressure sensor detects the vibration frequency of the steel string , to detect changes in the pressure of the seepage water, the pressure sensor and the waterproof circuit connector are electrically connected by wires, the lightning protector is a conductor of a sheet structure, and a through hole through which a wire passes is formed on the lightning protector, and the lightning protector The device is directly connected to the hollow shell, and the hollow shell is also a conductor, which can complete the electrical conduction between the lightning protector and the hollow shell. The lightning protector and the pressure sensor are electrically connected by wires to complete the lightning strike protection. When the pressure sensor is struck by lightning, the lightning can be transmitted to the hollow shell through the lightning protector, and the hollow shell is then transmitted to the conductor, so as to realize the lightning protection of the pressure sensor, waterproof joint and waterproof circuit connection The space between the pressure sensors is filled with sealing material to seal the hollow shell to prevent water seepage from entering the hollow shell and causing damage to the pressure sensor. There is a cable in the waterproof connector, and one end of the cable is electrically connected to the waterproof circuit connector. The other end extends through the sealing material to the outside of the hollow casing.

Specifically, the flexible membrane isolates the permeating water from the pressure-bearing diaphragm. Since the heat transfer fluid does not experience frost heaving at low temperatures, it effectively avoids damage to the pressure-bearing diaphragm due to frost heaving in a low-temperature environment, and improves the permeability. Measuring accuracy of the pressure gauge.

Referring to Fig. 2, Fig. 2 shows a flow chart of a method of using a vibrating wire piezometer suitable for use in a cold environment in the embodiment of the present application. The method of use includes the following steps:

In step S1, the vibrating wire piezometer is buried inside a structure or soil.

In the present application, the burying method of the vibrating wire piezometer can be the burying method of the existing vibrating wire piezometer.

In step S2, the water inside the structure or the soil penetrates into the hollow shell through the water permeable mechanism to form a permeable water pressure.

In step S3, the isolation mechanism senses the pressure of the osmotic water, transmits the pressure of the osmotic water to the pressure sensing mechanism, and isolates the pressure sensing mechanism from the water permeable mechanism.

In this application, the isolation mechanism reduces the influence of the low temperature environment on the pressure sensing mechanism by isolating the pressure sensing mechanism and the water-permeable mechanism.

In step S4, the pressure sensing mechanism detects the osmotic water pressure transmitted by the isolation mechanism, obtains the detection result, and transmits the detection result through the circuit connection mechanism

In this application, the pressure sensing mechanism can detect the pressure of the permeated water to complete the work of monitoring the permeated water pressure.

The above description is only an embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of the claims of the present application.

Claims (10)

1. The utility model provides a vibrating wire osmometer suitable for cold circumstance uses which characterized in that, includes both ends open-ended cavity casing, the cavity casing includes:

the water permeable mechanism is arranged at one end of the hollow shell and is used for permeating water into the hollow shell to form osmotic water pressure;

the pressure sensing mechanism is arranged in the hollow shell;

the isolation mechanism is arranged in the hollow shell and used for isolating the permeable mechanism and the pressure sensing mechanism, sensing the osmotic water pressure and transmitting the osmotic water pressure to the pressure sensing mechanism;

the circuit connecting mechanism is electrically connected with the pressure sensing mechanism and is arranged at the other end of the hollow shell;

and the sealing mechanism is used for sealing the circuit connecting mechanism and the other end of the hollow shell.

2. The osmometer of claim 1, wherein the pressure sensing mechanism comprises:

the pressure-bearing membrane is used for sensing the osmotic water pressure transmitted by the isolation mechanism;

the steel string is used for transmitting the osmotic pressure received by the pressure-bearing membrane;

and the pressure sensor is used for detecting the frequency of the steel string so as to detect the change of the osmotic water pressure and is electrically connected with the circuit connecting mechanism.

3. The osmometer of claim 1, wherein the isolation mechanism comprises:

the flexible membrane is used for forming a pressure chamber, and the pressure chamber is positioned between the flexible membrane and the water permeable mechanism;

and the conduction chamber is formed between the flexible membrane and the pressure sensing mechanism and is filled with heat conduction liquid.

4. Osmometer according to claim 1, characterized in that the hollow casing comprises:

the lightning stroke protector is electrically connected with the pressure sensing mechanism and the hollow shell.

5. The osmometer of claim 1, wherein the water permeable mechanism comprises:

the permeable stone is arranged at one end of the hollow shell.

6. The osmometer of claim 1, wherein the circuit connection mechanism comprises:

the waterproof circuit connector is arranged in the hollow shell, one end of the waterproof circuit connector is electrically connected with the pressure sensing mechanism, and the other end of the waterproof circuit connector is electrically connected with a cable;

and the cable extends out of the hollow shell, and the space between the cable and the waterproof circuit connector is sealed by a sealing mechanism.

7. The osmometer of claim 6, wherein the sealing mechanism seals the space between the cable and the waterproof circuit connector with a potting material.

8. The osmometer of claim 6, wherein the sealing mechanism comprises:

and the waterproof joint is arranged at the other end of the hollow shell, sleeved on the outer side of the cable and used for fixing the cable.

9. The osmometer of claim 1, wherein the hollow housing comprises:

and the temperature detection mechanism is arranged in the hollow shell and is electrically connected with the circuit connection mechanism.

10. A method of using a vibrating wire osmometer adapted for use in cold environments, the method comprising:

burying the vibrating wire osmometer in a structure or a soil body;

water in the structure or the soil body enters the hollow shell through the water permeable mechanism to form permeable water pressure;

the isolation mechanism senses the osmotic water pressure, transmits the osmotic water pressure to the pressure sensing mechanism and isolates the pressure sensing mechanism from the water permeable mechanism;

the pressure sensing mechanism detects the osmotic water pressure transmitted by the isolation mechanism to obtain a detection result, and the detection result is transmitted through the circuit connection mechanism.

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