CN107063184A - A kind of conductance type obliquity sensor for landslide monitoring - Google Patents

Abstract

A conductive inclination sensor for landslide monitoring, comprising an upper end cover, a sealed cabin, a casing, a circuit seat, a circuit board, a lower end cover, a collector ring, a base, a probe, and a temperature probe; the sealed cabin is filled with a solution; The upper and lower ends of the sealed cabin are processed with multi-level grooves, and the upper end cover is connected with the second-level grooves at the upper end of the sealed cabin through threads; the upper end of the shell is connected with the first-level grooves at the lower end of the sealed cabin through threads; Groove, the probe is placed in the secondary groove at the upper end of the base, and the top of the probe enters the solution inside the sealed cabin through the through hole in the middle of the sealed cabin; the upper end of the base is connected with the secondary groove at the lower end of the sealed cabin by threads; The lower end of the base is connected with the collector ring through threads; the circuit base is screwed into the shell through threads, and a threaded hole is opened at the bottom of the circuit base, and the temperature probe is screwed into the threaded hole through threads; the circuit board is fixedly installed with the circuit base on; the upper end of the lower end cover is threadedly connected with the lower end of the shell.

Description

A Conductive Inclinometer for Landslide Monitoring

technical field

The invention relates to the field of landslide monitoring, in particular to a conductive inclination sensor used for landslide monitoring, which can realize the measurement of the top angle of a borehole.

Background technique

As a common geological hazard worldwide, landslides are listed by the United Nations as one of the important research contents of the "International Decade for Disaster Reduction". Landslides are widely distributed both in time and space, and landslides are still very sudden and destructive when scientific and technological research cannot fully explain the mechanism and evolution of landslides. In order to effectively avoid or reduce the losses caused by landslide geological disasters, scholars at home and abroad have conducted a lot of research on landslides, and have achieved a series of remarkable results in the aspects of landslide cognition, discovery, monitoring, forecasting, and prevention. The monitoring method is the basis of landslide research, and it is also the most effective way to reduce disaster losses and casualties.

Landslide monitoring methods can be divided into surface monitoring method and deep monitoring method. The surface monitoring method only monitors landslide change factors such as surface displacement, precipitation, and pore water pressure of the landslide body. Since most of the change factors of the landslide body are determined by the deep part of the landslide body. Generated and gradually spread to the surface, so the accuracy of deep landslide monitoring is higher.

Common monitoring parameters in the deep part of landslides include displacement, force, and pore water pressure. Since deep displacement monitoring can more intuitively reflect the evolution process of landslides, it is more commonly used, and inclinometer technology is a commonly used deep part of landslides. Displacement monitoring method.

The inclinometer is a monitoring instrument for measuring the horizontal displacement of a borehole. When using it, a hole is drilled on a potential landslide body in advance. After the borehole is completed, a hard plastic pipe or metal pipe is put into the borehole. The length of the pipe is the same as the length of the borehole. Same, then backfill the annulus between the pipe and the inner wall of the borehole. The inclinometer is gradually lowered from the mouth of the pipe to the bottom of the pipe, and data is collected at a fixed distance during this period (the distance is generally 0.5 meters or 1 meter). The data collected by the inclinometer is the angle between the pipe and the plumb line (that is, the inclination angle), therefore, the horizontal displacement of the inclinometer at each measurement point can be obtained by using the knowledge of trigonometric functions combined with the inclination angle and the depth of the position of the inclinometer. The core component of the inclinometer is the inclination sensor, whose main function is to measure the top angle of the borehole (also known as the inclination angle).

According to the different implementation principles of apex angle measurement, the inclination sensors commonly used in inclinometers are divided into two types, namely pendulum inclination sensors and accelerometer inclination sensors. Among them, the pendulum-type inclination sensor uses a special measurement method to measure the position of the pendulum inside the sensor off the axis, so as to obtain the top angle, but its components are complex, and the main components are composed of mechanical moving parts, so they are prone to damage or wear during use, resulting in Failures happen, so use less. The accelerometer-type inclination sensor generally needs to be able to detect the mass (sensitive mass), support, potentiometer, spring, damper, housing, etc., and uses electronic methods to measure the top angle, so the accuracy is high, but it is a precision electronic component. It is easy to cause damage in strata with complex working conditions, and when using an accelerometer-type inclination sensor to measure the top angle, it is generally solved by using the strapdown inertial navigation formula, and the calculation process is relatively complicated. Therefore, there is an urgent need for an environmental An inclination sensor for landslides with high adaptability, simple data processing, high corresponding frequency and low cost.

Contents of the invention

In view of this, an embodiment of the present invention provides a conductive inclination sensor for landslide monitoring, which is used for measuring the top angle in the deep displacement monitoring of the landslide body.

An embodiment of the present invention provides a conductive inclination sensor for landslide monitoring, including an upper end cover, a sealed cabin, a housing, a circuit seat, a circuit board, a lower end cover, a collector ring, a base, a probe and a temperature probe; The sealed cabin is equipped with solution; the upper and lower ends of the sealed cabin are processed with multi-level grooves, and a through hole is arranged in the middle, and the upper end cover is connected with the secondary groove at the upper end of the sealed cabin by threads; The grooves are connected by threads; the upper and lower ends of the base are also processed with multi-level grooves, the probe is placed in the second-level groove on the upper end of the base, and the top of the probe passes through the through hole in the middle of the sealed cabin and enters the inside of the sealed cabin. solution; the upper end of the base is connected with the secondary groove at the lower end of the sealed cabin through threads; the lower end of the base is connected with the collector ring through threads; the circuit seat is connected with the shell through threads and screwed into the shell, and the bottom of the circuit seat has A threaded hole, the temperature probe is screwed into the threaded hole; the circuit board is fixedly installed on the circuit seat; the upper end of the lower end cover is connected with the lower end of the shell through threads.

Further, the conductive inclination sensor also includes a fixed joint, an armored cable and a cable waterproof joint, a groove is arranged above the upper end cover, and the lower end of the fixed joint is connected to the groove of the upper end cover through threads; the lower end of the lower end cover Processed with multi-level grooves, the first gasket is placed in the first-level groove at the lower end of the lower end cover, and the upper end of the cable waterproof joint is connected with the second-level groove at the lower end of the lower end cover through threads, and the first gasket is pressed to seal , the armored cable passes through the center hole of the cable waterproof joint. When the cable waterproof joint and the lower end cover are screwed together, the armored cable is also clamped to achieve sealing.

Further, a first O-ring is placed in the first-level groove at the upper end of the airtight cabin, and the upper end cover and the second-level groove at the upper end of the airtight cabin are screwed together to seal the first O-ring; the sealing A second O-ring is placed on the first-level groove at the lower end of the cabin, and the upper end of the shell is connected to the first-level groove at the lower end of the sealing cabin through threads, and the second O-ring is pressed to seal; the second-level groove at the lower end of the sealing cabin A second gasket is placed inside, and the upper end of the base is connected to the lower end of the sealing chamber through threads, and the second gasket is pressed to seal; the third O-ring is placed on the stepped shaft at the upper end of the lower end cover, and the upper end of the lower end cover While being connected with the lower end of the housing through threads, the third O-ring is compressed to seal.

Further, a first rubber ring is provided between the through hole in the middle of the sealed cabin and the probe, and the periphery of the first rubber ring is pasted on the through hole in the middle of the sealed cabin by glue; A second rubber ring for fixing the probe is arranged between the groove and the probe; a gland is placed above the second rubber ring, and the fixing screw passes through the through hole on the gland and connects with the base through threads. While connecting, the second rubber ring is compressed, and the second rubber ring will produce radial deformation while being compressed, so that the probe is tightly hugged and fixed.

Further, the circuit base and the circuit board are processed with corresponding through holes, and the bolts pass through the through holes on the circuit board and the circuit base in turn and are connected with nuts to fix the circuit board on the circuit base.

Further, the upper end of the fixed joint is processed with an inner hexagonal groove for unscrewing, and the upper end of the fixed joint is processed with external threads for connecting and fixing the entire sensor to the outside.

Further, the solution is a sodium chloride solution with a concentration of 0.25mol/L.

Further, the probe material is metallic platinum.

Furthermore, the measurement data of the temperature probe and the probe are all input into the circuit board through wires (not shown in the figure), and the circuit board processes the data and outputs the data through the armored cable.

The working principle of the whole sensor is: the probe inside the sensor is immersed in the sodium chloride solution in the sealed cabin, and the height of the probe immersed in the solution is h. At this time, the positive pole of the DC power supply is connected to the probe, and the DC The ground of the power supply is connected to the inner wall of the sealed cabin. Since the solution is conductive, the entire circuit is turned on at this time, and the conduction current in the circuit is I; when the vertex angle changes, the height h of the probe immersed in the solution will occur At this time, the conduction current I in the circuit will also change, and the inclination sensor is made according to this principle.

Description of drawings

Fig. 1 is a front view of a conductive inclination sensor for landslide monitoring according to the present invention.

Fig. 2 is a top view of a conductive inclination sensor used for landslide monitoring according to the present invention.

Fig. 3 is a bottom view of a conductive inclination sensor used for landslide monitoring according to the present invention.

Fig. 4 is a schematic cross-sectional view of a conductive inclination sensor A-A for landslide monitoring according to the present invention.

Fig. 5 is a schematic diagram of the working principle of a conductive inclination sensor for landslide monitoring according to the present invention.

In the above figure, 1. Upper end cover; 2. First O-ring; 3. Sealed cabin; 4. First rubber ring; 5. Second O-ring; 6. Shell; 7. Second rubber ring; 8. Circuit seat; 9, third O-ring; 10, nut; 11, first gasket; 12, armored cable; 13, cable waterproof joint; 14, circuit board; 15, lower end cover; 16, bolt; 17, Collecting ring; 18, base; 19, fixing screw; 20, gland; 21, second gasket; 22, solution; 23, probe; 24, fixed joint; 25, temperature probe.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the embodiment of the present invention provides a kind of conduction type inclination sensor used for landslide monitoring, comprises upper end cover 1, first O-ring 2, sealing cabin 3, the first A rubber ring 4, a second O-ring 5, a casing 6, a second rubber ring 7, a circuit seat 8, a third O-ring 9, a nut 10, a first gasket 11, an armored cable 12, and a cable waterproof joint 13 , circuit board 14, lower end cover 15, bolt 16, collector ring 17, base 18, fixing screw 19, gland 20, second gasket 21, solution 22, probe 23, fixed joint 24, temperature probe 25.

The upper and lower ends of the sealed cabin 3 are processed with multi-level grooves, the first O-ring 2 is placed in the first-level groove at the upper end of the sealed cabin 3, and the upper end cover 1 and the second-level groove at the upper end of the sealed cabin 3 are connected by threads. Compress the first O-ring 2 for sealing. A second O-ring 5 is placed on the first-level groove at the lower end of the airtight cabin 3, and the second O-ring 5 is compressed and sealed while the upper end of the casing 6 is connected to the first-level groove at the lower end of the airtight cabin 3 by threads. The upper and lower ends of the base 18 are also processed with multi-level grooves, the second rubber ring 7 is placed in the first-level groove on the upper end of the base 18, the probe 23 is placed in the middle hole of the second rubber ring 7, and the gland 20 is placed On the top of the second rubber ring 7, the second rubber ring 7 is compressed while the fixing screw 19 passes through the through hole on the gland 20 and is connected to the base 18 by threads, and the second rubber ring 7 is compressed. Radial deformation will occur, so that the probe 23 is hugged and fixed. The first rubber ring 4 is pasted in the secondary groove at the lower end of the sealed cabin 3 by glue, and the probe 23 enters the inside of the sealed cabin 3 after passing through the central hole of the gland 20 and the first rubber ring 4 in turn. A second gasket 21 is placed in the secondary groove at the lower end of the airtight cabin 3, and the upper end of the base 18 is connected to the lower end of the airtight cabin 3 by threads, and the second gasket 21 is compressed for sealing. The sealed cabin 3 is filled with a solution 22 . The lower end of the base 18 is connected with the collector ring 17 through threads. The shell 6 is processed with threads, the circuit base 8 is connected with the shell 6 through threads and screwed into the shell 6, the circuit base 8 is processed with through holes, the circuit board 14 is placed on the circuit base 8, and the bolts 16 pass through the circuit board in turn 14 and the through hole on the circuit base 8 are connected with the nut 10, thus the circuit board 14 is fixed on the circuit base 8. There is a threaded hole at the bottom of the circuit base 8, and the temperature probe 25 is screwed into the threaded hole. The upper and lower ends of the lower end cover 15 are threaded, the third O-ring 9 is placed on the stepped shaft at the upper end of the lower end cover 15, and the upper end of the lower end cover 15 is connected to the lower end of the housing 6 through threads while the third O-ring 9 is pressed. For tight sealing, the lower end of the lower end cover 15 is processed with multi-level grooves, the first gasket 11 is placed in the first-level groove at the lower end of the lower end cover 15, and the upper end of the cable waterproof joint 13 is connected to the second-level groove at the lower end of the lower end cover 15 through threads. While connecting, press the first gasket 11 to seal it. The armored cable 12 passes through the center hole of the cable waterproof joint 13. When the cable waterproof joint 13 and the lower end cover 15 are screwed tightly, the armored cable 12 is also clamped. tight to achieve a seal. A threaded groove is processed above the upper end cover 1, and the lower end of the fixed joint 24 is screwed into the groove by threads.

The upper end of the fixed joint 24 is processed with an inner hexagonal groove for unscrewing. The upper end of the fixed joint 24 is also processed with external threads for connecting and fixing the entire sensor with the outside.

The solution 22 is a sodium chloride solution 22 with a concentration of 0.25 mol/L.

The material of the probe 23 is metal platinum.

The measurement data of the temperature probe 25 (as shown in FIG. 4 ) and the probe 23 are all input into the circuit board 14 through wires (not shown in the figure), and the circuit board 14 outputs the data through the armored cable 12 after processing the data.

A schematic diagram of the working principle of a conductive inclination sensor for landslide monitoring according to the present invention is shown in FIG. 5 . The working principle of the whole sensor is: the sensor is buried in the monitored landslide, the probe 23 inside the sensor is immersed in the sodium chloride solution 22 in the sealed cabin 3, and the height of the probe 23 immersed in the solution 22 is h, At this moment, the positive pole of the DC power supply is connected with the probe 23, and the ground of the DC power supply is connected with the inner wall of the sealed cabin 3. Since the solution 22 has conductivity, the entire circuit is turned on at this time, and the conduction current in the circuit is now is I; when the landslide moves, the angle between the plane of the sensor internal solution 22 and the probe 23 changes, and the height h of the probe 23 immersed in the solution 22 will change to h1, and the conduction current I in the circuit will also change at this time , according to the functional relationship between the change of h and the change of current I, the inclination sensor is made, so that the horizontal displacement of the landslide can be obtained.

In this article, the orientation words such as front, rear, upper, and lower involved are defined by the parts in the drawings and the positions between the parts in the drawings, just for the clarity and convenience of expressing the technical solution. It should be understood that the use of the location words should not limit the scope of protection claimed in this application.

In the case of no conflict, the above-mentioned embodiments and features in the embodiments herein may be combined with each other.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. a conductance type inclination sensor for landslide monitoring, is characterized in that: comprise upper end cover, sealed cabin, shell, circuit seat, circuit board, lower end cover, collector ring, base, probe and temperature probe; The sealed cabin is equipped with solution; the upper and lower ends of the sealed cabin are processed with multi-level grooves, and a through hole is arranged in the middle, and the upper end cover is connected with the secondary groove at the upper end of the sealed cabin by threads; The grooves are connected by threads; the upper and lower ends of the base are also processed with multi-level grooves, the probe is placed in the second-level groove on the upper end of the base, and the top of the probe passes through the through hole in the middle of the sealed cabin and enters the inside of the sealed cabin. solution; the upper end of the base is connected with the secondary groove at the lower end of the sealed cabin through threads; the lower end of the base is connected with the collector ring through threads; the circuit seat is connected with the shell through threads and screwed into the shell, and the bottom of the circuit seat has A threaded hole, the temperature probe is screwed into the threaded hole; the circuit board is fixedly installed on the circuit seat; the upper end of the lower end cover is connected with the lower end of the shell through threads. 2. A kind of conduction type inclination sensor that is used for landslide monitoring according to claim 1, is characterized in that: also comprise fixed joint, armored cable and cable waterproof joint, be provided with groove above described upper end cover, fixed joint The lower end and the groove of the upper end cover are connected through threads; the lower end of the lower end cover is processed with multi-level grooves, the first gasket is placed in the first-level groove at the lower end of the lower end cover, and the upper end of the cable waterproof joint is threaded with the lower end of the lower end cover. While connecting the level groove, press the first gasket to seal it. The armored cable passes through the center hole of the cable waterproof joint. When the cable waterproof joint and the lower end cover are screwed tightly, the armored cable is also clamped. Thereby achieving sealing. 3. A conductive inclination sensor for landslide monitoring according to claim 1, characterized in that: a first O-ring is placed in the first-level groove at the upper end of the sealed cabin, and the upper end cover is connected with the upper end of the sealed cabin. The first O-ring is compressed and sealed while the first-level groove is connected by thread; the second O-ring is placed on the first-level groove at the lower end of the airtight cabin, and the upper end of the shell is connected with the first-level groove at the lower end of the airtight cabin by threads At the same time, the second O-ring is compressed to seal; the second gasket is placed in the second-level groove at the lower end of the sealed cabin, and the upper end of the base is connected to the lower end of the sealed cabin through threads, and the second gasket is compressed for sealing. seal. 4. A conductive inclination sensor for landslide monitoring according to claim 1, characterized in that: a third O-ring is placed on the stepped shaft at the upper end of the lower end cover, and the upper end of the lower end cover is connected to the lower end of the housing through threads. While connecting, press the third O-ring to seal. 5. A kind of conduction type inclination sensor that is used for landslide monitoring according to claim 1, is characterized in that: the first rubber ring is arranged between the through hole in the middle of the sealed cabin and the probe, the first rubber ring The surrounding area is pasted on the through hole in the middle of the sealed cabin by glue; a second rubber ring for fixing the probe is arranged between the secondary groove on the upper end of the base and the probe; the second rubber ring of the second rubber ring A gland is placed on the top, the fixing screw passes through the through hole on the gland, and the second rubber ring is compressed while the fixing screw is threaded and connected to the base. The probe is held tightly in place. 6. A conductive inclination sensor for landslide monitoring according to claim 1, characterized in that: the circuit base and the circuit board are processed with corresponding through holes, and the bolts pass through the circuit board and the circuit board in sequence Connect the through hole with the nut to fix the circuit board on the circuit seat. 7. A conductive inclination sensor for landslide monitoring according to claim 2, characterized in that: the upper end of the fixed joint is processed with an inner hexagonal groove for unscrewing, and the upper end of the fixed joint is processed with an external thread. It is used to connect and fix the entire sensor with the outside. 8. A conductive inclination sensor for landslide monitoring according to claim 1, characterized in that: the solution is a sodium chloride solution with a concentration of 0.25 mol/L. 9. A conductive inclination sensor for landslide monitoring according to claim 1, characterized in that: the probe material is metal platinum. 10. A kind of conductivity type inclination sensor for landslide monitoring according to claim 1 or 2, it is characterized in that: the measurement data of temperature probe and probe all input circuit board by wire, after circuit board processes data, it will be Data is output via armored cables.