A deep soil body displacement monitoring device based on a MEMS sensor and a use method thereof

Abstract

The application discloses a deep soil body displacement monitoring device based on a MEMS sensor, which comprises a monitoring line connected with an upper computer connection port at one end, and a MEMS sensor connected with the other end of the monitoring line; the monitoring line comprises a straight line segment and an elastic spiral line segment; a buckle is arranged on the straight line segment close to the upper side of the elastic spiral line segment; a stretchable air bag and a semi-open soil isolation box are sequentially wrapped outside the elastic spiral line segment of the monitoring line from inside to outside; an air bag inflation port, an air bag upper threading port, an air bag lower threading port and a deformation prevention ring are arranged on the stretchable air bag; a soil isolation box upper threading port, a soil isolation box lower threading port and a soil isolation box pipe threading port are arranged on the soil isolation box; and the stretchable air bag is externally connected with an air pump through an air pipe. The device has low cost, is not affected by soil pressure and underground water, and is accurate in monitoring.

Description

Technical Field

[0001] This invention relates to geotechnical engineering monitoring auxiliary technology, specifically a deep soil displacement monitoring device and its usage method based on MEMS sensors. Background Technology

[0002] In the field of geotechnical engineering monitoring, deformation (geometric) monitoring of soil and rock masses is an extremely important part. Displacement is a crucial factor in deformation monitoring because it provides a relatively direct indication of soil and rock deformation.

[0003] Existing methods for monitoring soil and rock displacement primarily focus on surface displacement, which cannot comprehensively capture the dynamic deformation characteristics of soil and rock masses. Therefore, deep displacement monitoring of soil and rock masses is also necessary. Besides inclinometers and optical fibers, MEMS sensors, which have emerged in recent years, are increasingly used in deep soil displacement monitoring. However, because MEMS sensors used for deep soil displacement monitoring require wired connections, the monitoring lines are easily affected by the soil pressure from the borehole backfill, restricting the movement of the MEMS sensors and preventing accurate data output. Therefore, there is an urgent need to find a deep soil displacement monitoring device based on MEMS sensors. This device should have the advantages of allowing the sensor to be placed at any depth in the borehole, the monitoring lines being unaffected by backfill soil pressure, and the ability to operate underground for extended periods without being affected by groundwater seepage. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a deep soil displacement monitoring device and its usage method based on MEMS sensors. This device is low-cost, unaffected by soil pressure and groundwater, and allows the MEMS sensor to be placed at any target borehole depth for accurate monitoring.

[0005] The technical solution to achieve the objective of this invention is:

[0006] A deep soil displacement monitoring device based on a MEMS sensor includes a monitoring line connected to a host computer at one end and a MEMS sensor connected to the other end of the monitoring line. The monitoring line includes a straight section and an elastic spiral section. A buckle is provided on the straight section near the upper part of the elastic spiral section. The elastic spiral section of the monitoring line is surrounded by a telescopic airbag and a half-open soil isolation box from the inside out. The telescopic airbag is provided with an airbag inflation port, an upper wire insertion port, a lower wire insertion port, and an anti-deformation ring. The soil isolation box is provided with an upper wire insertion port, a lower wire insertion port, and a pipe insertion port. The telescopic airbag is connected to an external air pump through an air pipe.

[0007] The telescopic airbag has a hollow cavity and an inflation chamber surrounding the hollow cavity, and the inflation chamber is connected to the airbag inflation port.

[0008] The two ends of the hollow cavity of the telescopic airbag are connected to the upper and lower wiring ports of the airbag, respectively, and the elastic spiral segment of the monitoring line is located inside the hollow cavity of the telescopic airbag.

[0009] The wire insertion ports on the top and bottom of the soil separator box, the top and bottom of the airbag, are located on the same axis.

[0010] The location of the soil separator tube opening corresponds to the location of the airbag inflation port.

[0011] The telescopic airbag has multiple annular folds, and the anti-deformation ring is located at the fold of the annular fold.

[0012] The MEMS sensor is an MPU-6050 motion processing module with waterproof encapsulation. It integrates a three-axis accelerometer and a three-axis micro-mechanical electronic gyroscope, which can accurately output the acceleration and angle information of the soil during movement. After integrating the acceleration, the displacement of the underground soil can be obtained.

[0013] The monitoring line has a pre-set scale on the straight section. The scale is zero at the host computer connection port and gradually increases as it moves down to the elastic spiral section.

[0014] The inner diameter of the soil-separating box is larger than the outer diameter of the telescopic airbag, and its material is a non-magnetic material with a density greater than that of water.

[0015] The air tube is a rubber tube with a ring-shaped spiral steel wire structure, which has a certain elasticity and is not easy to bend. In addition, it can ensure that the air tube does not deform under soil compression, thus affecting the inflation and deflation of the telescopic airbag.

[0016] The diameter of the toroidal segment of the elastic spiral is smaller than the diameter of the hollow cavity of the telescopic airbag but larger than the diameter of the airbag's thread opening. This ensures that when the telescopic airbag contracts longitudinally, the upper and lower thread openings of the airbag can press the elastic spiral segment tightly, preventing it from being pulled out, allowing the MEMS sensor to smoothly reach the monitoring depth. After the backfilling is completed, the airbag is inflated, which releases the pressure on the elastic spiral segment, allowing the moving MEMS sensor to pull it out smoothly.

[0017] The buckle is attached to the straight section slightly above the elastic spiral segment, and the buckle diameter is larger than the diameter of the wire thread opening of the soil separator box.

[0018] The elastic spiral segment of the monitoring line, used in conjunction with the soil isolation box, telescopic airbag, air pump, and buckle, prevents the MEMS sensor from falling out due to its own weight when it is lowered to the target depth of the borehole. After the backfilling is completed, inflating the telescopic airbag can relieve the compression on the elastic spiral segment, allowing the MEMS sensor to flexibly pull the elastic spiral segment, thereby accurately reflecting the soil movement.

[0019] A method for using a deep soil displacement monitoring device based on MEMS sensors, comprising the aforementioned deep soil displacement monitoring device based on MEMS sensors, the method comprising the following steps:

[0020] 1. The telescopic airbag and the air pump are connected by an air pipe. When the air pump works, it inflates the inflation chamber of the telescopic airbag to ensure that the hollow cavity of the telescopic airbag is longer than the elastic spiral section of the monitoring line.

[0021] 2. Pass the upper end of the straight section of the monitoring line through the lower and upper holes of the inflated telescopic airbag in sequence. When the elastic spiral section of the monitoring line reaches the lower hole of the airbag, apply force to the straight sections of the monitoring line on both sides of the telescopic airbag in the outward direction to stretch the elastic spiral section of the monitoring line to the extent that it can pass smoothly through the lower hole of the airbag and enter the cavity of the telescopic airbag.

[0022] 3. When the elastic spiral segment of the monitoring line is completely inside the cavity of the telescopic airbag, release the monitoring line to ensure that the elastic spiral segment of the monitoring line returns to its original state, and the elastic spiral segment is completely inside the cavity of the telescopic airbag.

[0023] 4. Use waterproof glue to attach a buckle to the straight section near the upper end of the wire hole on the airbag. Install the host computer connection port at the upper end of the monitoring line and the MEMS sensor at the lower end of the monitoring line. Pull the air tube out of the air pump and connect it to the telescopic airbag. The air pump sucks in air to tighten the telescopic airbag, ensuring that the elastic spiral section will not fall out due to the weight of the MEMS sensor when it is tightened.

[0024] 5. Separate the soil-separating box from the middle, apply waterproof glue, and stick it to the outer surface of the telescopic airbag. Reinforce it again with tape. During the sticking process, ensure that the wire hole on the soil-separating box is above the buckle, and ensure that the upper and lower ends of the monitoring line pass through the upper and lower wire holes of the soil-separating box respectively. The air tube passes through the tube hole of the soil-separating box.

[0025] 6. Insert the MEMS sensor into the borehole. Determine the borehole depth based on the scale on the surface of the straight section and the length of the telescopic airbag. The total length of the straight section is N, the remaining length of the line on the ground is n, and the length of the telescopic airbag is m. Then the MEMS sensor is located at (N-n+m) meters.

[0026] 7. After reaching the designated depth, backfill the soil. Once backfilling is complete, inflate the telescopic airbag to release its squeezing effect on the elastic spiral segment. Connect the host computer to the host computer via the upper computer connection port to monitor the deep displacement of the soil.

[0027] This technical solution has the following advantages:

[0028] (1) When the telescopic airbag contracts, the elastic spiral segment is compressed, and the surface scale of the straight segment allows the MEMS sensor to reach the specified depth before drilling and backfilling.

[0029] (2) After drilling and backfilling, the telescopic airbag is used in conjunction with the air pump, soil separator and buckle to ensure that the telescopic airbag expands smoothly and relieves the squeezing effect of the telescopic airbag on the elastic spiral segment. In addition, the soil pressure cannot affect the elastic spiral segment, ensuring that when the soil moves, the MEMS sensor can pull the elastic spiral segment to move flexibly with the soil.

[0030] (3) Due to the influence of drilling depth, groundwater may seep out. The material of the soil separator is a non-magnetic material with a density greater than that of water. This avoids the MEMS sensor from being unable to reach the target monitoring depth due to the buoyancy of groundwater, and also ensures that the MEMS sensor is close to magnetic objects, which may cause the device to malfunction.

[0031] (4) The materials of the device are easy to obtain and easy to manufacture. In addition, the device itself has a low cost. With a low cost, the MEMS sensor can reach the specified depth, and the monitoring line can avoid the influence of soil pressure. The device is not affected by groundwater and does not cause magnetic field influence on the MEMS sensor itself. Attached Figure Description

[0032] Figure 1 This is a structural diagram of an embodiment;

[0033] Figure 2 This is a schematic diagram of the telescopic airbag structure in the embodiment;

[0034] Figure 3 This is a schematic diagram of the soil-separating box structure in the embodiment;

[0035] Figure 4 This is a schematic diagram of the monitoring line in the embodiment;

[0036] Figure 5 This is a schematic diagram of the snap-fit ​​structure in the embodiment.

[0037] In the diagram: 1. Host computer connection port, 2. Air pump, 3. Air pipe, 4. Monitoring line, 5. Telescopic airbag, 6. Buckle, 7. Soil-separating box, 8. MEMS sensor, 9. Airbag upper wiring port, 10. Airbag lower wiring port, 11. Airbag inflation port, 12. Anti-deformation ring, 13. Hollow cavity, 14. Inflation chamber, 15. Soil-separating box upper wiring port, 16. Soil-separating box lower wiring port, 17. Soil-separating box pipe port, 18. Straight section, 19. Elastic spiral section. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this is not intended to limit the scope of the invention. Example

[0039] Reference Figure 1A deep soil displacement monitoring device based on MEMS sensors includes a monitoring line 4 connected at one end to a host computer connection port 1, and a MEMS sensor 8 connected at the other end of the monitoring line 4. Figure 4 As shown, the monitoring line 8 includes a straight section 18 and an elastic spiral section 19. A buckle 6 is provided on the straight section near the upper part of the elastic spiral section. The elastic spiral section 19 of the monitoring line is surrounded from the inside out by a telescopic airbag 5 and a half-open soil-separating box 7. Figure 2 As shown, the telescopic airbag 5 is provided with an airbag inflation port 11, an upper airbag threading port 9, a lower airbag threading port 10, and an anti-deformation ring 12, as follows. Figure 3 As shown, the soil-separating box 7 is provided with a soil-separating box upper wire-passing port 15, a soil-separating box lower wire-passing port 16 and a soil-separating box pipe-passing port 17, and the telescopic airbag 5 is connected to an external air pump 2 through an air pipe 3.

[0040] The telescopic airbag 5 has a hollow cavity 13 and an inflation cavity 14 surrounding the hollow cavity 13, and the inflation cavity 14 is connected to the airbag inflation port 11.

[0041] The two ends of the hollow cavity 13 of the telescopic airbag are connected to the upper wiring port 9 and the lower wiring port 10 of the airbag, respectively, and the elastic spiral segment 19 of the monitoring line is located inside the hollow cavity 13 of the telescopic airbag 5.

[0042] The upper wire insertion port 15 of the soil separator box, the lower wire insertion port 16 of the soil separator box, the upper wire insertion port 9 of the airbag, and the lower wire insertion port 10 of the airbag are located on the same axis.

[0043] The position of the soil separator tube opening 17 corresponds to the position of the airbag inflation port 11.

[0044] The telescopic airbag 5 is provided with multiple annular folds, and the anti-deformation ring 12 is located at the fold of the annular fold.

[0045] The MEMS sensor 8 is a waterproof encapsulated MPU-6050 motion processing module, which integrates a three-axis accelerometer and a three-axis micro-mechanical electronic gyroscope. It can accurately output the acceleration and angle information of the soil during movement. After integrating the acceleration, the displacement of the underground soil can be obtained.

[0046] The monitoring line has a reserved scale on the straight section 18. The scale is zero at the length of port 1 at the host computer and gradually increases down to the elastic spiral section 19.

[0047] The inner diameter of the soil-separating box 7 is larger than the outer diameter of the telescopic airbag 5, and its material is non-magnetic and has a density greater than that of water.

[0048] The air tube 3 is a rubber tube with a ring-shaped steel wire structure, which has a certain elasticity and is not easy to bend. In addition, it can ensure that the air tube does not deform under soil compression, thus affecting the inflation and deflation of the telescopic airbag.

[0049] The annular diameter of the elastic spiral segment 19 is smaller than the diameter of the hollow cavity 13 of the telescopic airbag but larger than the diameter of the airbag thread opening. This ensures that when the telescopic airbag 5 contracts longitudinally, the upper and lower thread openings of the airbag can press the elastic spiral segment 19 tightly, preventing it from being pulled out and allowing the MEMS sensor 8 to smoothly reach the monitoring depth. After the backfilling is completed, the telescopic airbag is inflated, which cancels the compression on the elastic spiral segment 19, allowing the elastic spiral segment 19 to be smoothly pulled out by the moving MEMS sensor 8.

[0050] The elastic spiral segment 19 of the monitoring line, used in conjunction with the soil isolation box 7, the telescopic airbag 5, and the air pump 2, prevents the MEMS sensor 8 from falling out due to its own weight when it is lowered to the target depth of the borehole. After the backfilling is completed, inflating the telescopic airbag 5 can relieve the compression on the elastic spiral segment 19, allowing the MEMS sensor 8 to flexibly pull the elastic spiral segment 19, thereby accurately reflecting the soil movement.

[0051] A method for using a deep soil displacement monitoring device based on MEMS sensors, comprising the aforementioned deep soil displacement monitoring device based on MEMS sensors, the method comprising the following steps:

[0052] 1. The telescopic airbag 5 and the air pump 2 are connected by an air pipe 3. The air pump 2 works to inflate the inflation chamber 14 of the telescopic airbag 5, ensuring that the hollow cavity 13 of the telescopic airbag 5 is longer than the elastic spiral segment 19 of the monitoring line.

[0053] 2. Pass the upper end of the straight section 18 of the monitoring line through the lower cable opening 10 and the upper cable opening 9 of the inflated telescopic airbag 5 in sequence. When the elastic spiral section 19 of the monitoring line reaches the lower cable opening 10 of the airbag, apply force to the straight section 18 of the monitoring line on both sides of the telescopic airbag 5 in the outward direction, so that the elastic spiral section 19 of the monitoring line is stretched to the extent that it can pass smoothly through the lower cable opening 10 of the airbag and enter the hollow cavity 13 of the telescopic airbag.

[0054] 3. When the elastic spiral segment 19 of the monitoring line is completely inside the cavity 13 of the telescopic airbag, release the monitoring line to ensure that the elastic spiral segment 19 of the monitoring line returns to its original state, and the elastic spiral segment 19 is completely inside the cavity 13 of the telescopic airbag.

[0055] 4. Attach the buckle 6 to the straight section 18 near the upper end of the threading opening 9 on the airbag using waterproof adhesive, such as... Figure 5As shown, a host computer connection port 1 is installed at the upper end of the monitoring line, and a MEMS sensor 8 is installed at the lower end of the monitoring line. The air tube 3 is pulled out from the air pump 2 and connected to the telescopic air bag 5. The air pump 2 draws in air, causing the telescopic air bag 5 to tighten, ensuring that the elastic spiral segment 19 will not fall out due to the weight of the MEMS sensor 8 when it is tightened.

[0056] 5. Separate the soil-separating box 7 from the middle, apply waterproof glue, and stick it to the outside of the telescopic airbag 5. Then reinforce it with tape. During the sticking process, ensure that the wire hole 15 on the soil-separating box is above the buckle 6, and ensure that the upper and lower ends of the monitoring line pass through the upper and lower wire holes 15 and 16 of the soil-separating box respectively, and the air tube passes through the tube hole 17 of the soil-separating box.

[0057] 6. Insert the MEMS sensor 8 into the borehole. The borehole depth can be determined based on the scale on the surface of the straight segment 18 and the length of the telescopic airbag 5. The total length of the straight segment 18 is N, the remaining length of the line on the ground is n, and the length of the telescopic airbag 5 is m. Then the position of the MEMS sensor 8 is (N-n+m) meters.

[0058] 7. After reaching the designated depth, backfill the soil. Once backfilling is complete, inflate the telescopic airbag 5 to release the compression effect of the telescopic airbag 5 on the elastic spiral segment 10. Connect the host computer to the host computer at the host computer connection port 1 to monitor the deep displacement of the soil.

Claims

1. A deep soil displacement monitoring device based on MEMS sensors, characterized in that, The system includes a monitoring line connected to a host computer at one end and a MEMS sensor connected to the other end. The monitoring line includes a straight section and an elastic spiral section. A buckle is provided on the straight section near the upper part of the elastic spiral section. The elastic spiral section of the monitoring line is surrounded by a telescopic airbag and a semi-open soil-separating box from the inside out. The telescopic airbag is provided with an airbag inflation port, an upper wire insertion port, a lower wire insertion port, and an anti-deformation ring. The soil-separating box is provided with an upper wire insertion port, a lower wire insertion port, and a pipe insertion port. The telescopic airbag is connected to an external air pump through an air pipe. The telescopic airbag has a hollow cavity and an inflation chamber surrounding the hollow cavity, and the inflation chamber is connected to the airbag inflation port; The two ends of the hollow cavity of the telescopic airbag are connected to the upper and lower wiring ports of the airbag, respectively, and the elastic spiral segment of the monitoring line is located inside the hollow cavity of the telescopic airbag.

2. The deep soil displacement monitoring device based on MEMS sensors according to claim 1, characterized in that, The wire insertion ports on the top and bottom of the soil separator box, the top and bottom of the airbag, are located on the same axis.

3. The deep soil displacement monitoring device based on MEMS sensors according to claim 1, characterized in that, The location of the soil separator tube opening corresponds to the location of the airbag inflation port.

4. The deep soil displacement monitoring device based on MEMS sensors according to claim 1, characterized in that, The telescopic airbag has multiple annular folds, and the anti-deformation ring is located at the fold of the annular fold.

5. The deep soil displacement monitoring device based on MEMS sensors according to claim 1, characterized in that, The MEMS sensor is a waterproof-encapsulated MPU-6050 motion processing module, which integrates a three-axis accelerometer and a three-axis microelectromechanical gyroscope.

6. A method of using a deep soil displacement monitoring device based on a MEMS sensor, comprising the deep soil displacement monitoring device based on a MEMS sensor as described in any one of claims 1 to 5, the method comprising the following steps: 1) The telescopic airbag and the air pump are connected by an air pipe. When the air pump works, it inflates the inflation chamber of the telescopic airbag to ensure that the hollow cavity of the telescopic airbag is longer than the elastic spiral section of the monitoring line. 2) Pass the upper end of the straight section of the monitoring line through the lower and upper holes of the inflated telescopic airbag in sequence. When the elastic spiral section of the monitoring line reaches the lower hole of the airbag, apply force to the straight sections of the monitoring line on both sides of the telescopic airbag in the outward direction to stretch the elastic spiral section of the monitoring line to the extent that it can pass smoothly through the lower hole of the airbag and enter the cavity of the telescopic airbag. 3) When the elastic spiral segment of the monitoring line is completely inside the cavity of the telescopic airbag, release the monitoring line to ensure that the elastic spiral segment of the monitoring line returns to its original state, and the elastic spiral segment is completely inside the cavity of the telescopic airbag. 4) Use waterproof glue to attach a buckle to the straight section near the upper end of the wire hole on the airbag. Install the host computer connection port at the upper end of the monitoring line and the MEMS sensor at the lower end of the monitoring line. Pull the air tube out of the air pump and connect it to the telescopic airbag. The air pump sucks in air to tighten the telescopic airbag and ensures that the elastic spiral section will not fall out due to the weight of the MEMS sensor when it is tightened. 5) Separate the soil-separating box from the middle, apply waterproof glue, and stick it to the outer surface of the telescopic airbag. Reinforce it again with tape. During the sticking process, ensure that the wire hole on the soil-separating box is above the buckle, and ensure that the upper and lower ends of the monitoring line pass through the upper and lower wire holes of the soil-separating box respectively. The air tube passes through the tube hole of the soil-separating box. 6) Insert the MEMS sensor into the borehole and determine the borehole depth based on the surface scale of the straight section and the length of the telescopic airbag. The total length of the straight section is N, the remaining length of the line on the ground is n, and the length of the telescopic airbag is m. Then the MEMS sensor is located at (N-n+m) meters. 7) After reaching the designated depth, backfill the soil. Once backfilling is complete, inflate the telescopic airbag to release the compression effect of the telescopic airbag on the elastic spiral segment. Connect the host computer to the host computer at the upper computer connection port to monitor the deep displacement of the soil.

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