Sandy stratum surface collapse monitoring device

Abstract

The invention relates to the technical field of surface collapse monitoring, in particular to a sandy stratum surface collapse monitoring device which comprises an acousto-optic early warning device. An upper sleeve is arranged at the bottom of the acousto-optic early warning device, an early warning box is arranged at the bottom of the upper sleeve, and a lower sleeve is arranged at the bottom of the early A first rotating groove and a second rotating groove are formed in the inner side wall of the lower sleeve, a rotating disc is arranged in the lower sleeve, rotating blocks are symmetrically arranged on the rotating disc, the rotating blocks are in rotating fit with the first rotating groove and the second rotating groove respectively, first sliding grooves are symmetrically formed between the first rotating groove and the second rotating groove, and the rotating blocks are in vertical sliding fit with the first sliding grooves; a monitoring assembly is arranged below the rotating disc; an extension rod is arranged at the top of the rotating disc and extends into the upper sleeve, and an early warning assembly is arranged in the early warning box. According to the invention, the acousto-optic early warning device is combined with the early warning assembly, so that a multiple early warning mechanism is formed, and the reliability of surface collapse early warning work is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ground subsidence monitoring, and particularly relates to a ground subsidence monitoring device for sandy strata. Background Art

[0002] The successive occurrence of the 2·7 Foshan road surface subsidence accident, the 5·1 Meida Expressway road surface landslide accident and the 10·12 Shenzhen ground subsidence accident in Guangdong Province has posed a serious threat to people's lives and property. Geological disasters are extremely destructive and sudden. Especially in sandy strata, the soil structure is loose and the bearing capacity is low, which is prone to induce ground subsidence. Therefore, the monitoring and early warning of ground subsidence in sandy strata is particularly important.

[0003] Although some existing ground subsidence monitoring devices have realized the monitoring function of ground subsidence to a certain extent, due to the single warning method of using a single warning device, the warning function is not perfect enough, and it may not be able to send out warning signals in time and accurately, thus delaying the treatment time of ground subsidence.

[0004] In summary, the warning function of some existing ground subsidence monitoring devices is not perfect enough, and the problem of delayed warning that may be caused has become a difficult problem that needs to be solved urgently in this field. Therefore, it is necessary to propose a ground subsidence monitoring device for sandy strata. Summary of the Invention

[0005] To solve the above problems, the present invention provides a ground subsidence monitoring device for sandy strata. By combining an acoustic-optic warning device with a warning component, a multiple warning mechanism is formed, which improves the reliability of ground subsidence warning work.

[0006] To achieve the above object, the technical solution of the present invention is as follows: A ground subsidence monitoring device for sandy strata includes an acoustic-optic warning device. The acoustic-optic warning device is electrically connected to a controller, and the controller is electrically connected to a cloud processor. The controller is used to control the operation of the acoustic-optic warning device.

[0007] The bottom of the acoustic-optic warning device is fixedly connected to an upper sleeve, the bottom of the upper sleeve is fixedly connected to a warning box, and the bottom of the warning box is fixedly connected to a lower sleeve.

[0008] The inner side wall of the lower sleeve is successively provided with an annular first rotation groove and a second rotation groove from top to bottom. A rotating disk is arranged in the lower sleeve. The side wall of the rotating disk is symmetrically and fixedly connected with rotating blocks. The rotating blocks are respectively in rotational cooperation with the first rotation groove and the second rotation groove. First sliding grooves are symmetrically opened between the first rotation groove and the second rotation groove. The rotating blocks are all in vertical sliding cooperation with the first sliding grooves.

[0009] A monitoring component for monitoring the ground subsidence situation is arranged below the rotating disk.

[0010] An extension rod is coaxially fixedly connected to the top of the rotating disk. The extension rod passes through the warning box and extends into the upper sleeve. A warning component for issuing a physical warning is provided in the warning box.

[0011] The technical principles of the above scheme are as follows:

[0012] The staff installed the monitoring device in the ground so that its bottom is in contact with the ground. When the ground collapses, the monitoring component moves downward with the sinking of the ground, which in turn drives the rotating disk to rotate, and the rotating disk drives the rotating block and the extension rod to rotate, and the extension rod drives the early warning component to operate and issue a physical early warning.

[0013] When the rotating disk rotates in the first rotating groove, it slides down to the second sliding groove through the first sliding groove. If the ground still collapses at this time, the above movement process is repeated.

[0014] When the monitoring component moves downward, it will trigger the sound and light warning mechanism, and then send out a sound and light warning through the sound and light warning device.

[0015] The above scheme has the following beneficial effects:

[0016] 1. The present invention combines the sound and light warning device with the warning component, so that the monitoring device can detect the risk of ground collapse in time, and send out sound and light warning signals and physical warning signals through the sound and light warning device and the warning component respectively, reminding the staff to take countermeasures in time. Such a multiple warning mechanism improves the reliability of ground collapse warning work.

[0017] 2. The present invention, by setting up a monitoring component, the monitoring device can sense the specific situation of ground collapse in real time, and send the sensed situation to the controller, and the controller timely controls the operation of the sound and light warning device, thereby further improving the reliability of the monitoring device.

[0018] 3. In the present invention, the upper sleeve, the lower sleeve and the early warning box together form a stable support frame, which provides reliable protection and support for the monitoring components and the early warning components. This stable support structure ensures that the monitoring device can operate normally even under harsh geological conditions, and enhances the long-term stability of the monitoring device.

[0019] Furthermore, the monitoring component includes a rotating rod fixedly connected to the bottom of the rotating disk, a threaded groove is opened on the side wall of the rotating rod, an inner cylinder is vertically slidably matched with the inner wall of the lower sleeve, a clamping block is fixedly connected to the inner wall of the inner cylinder, and the clamping block is slidably matched with the threaded groove.

[0020] A first groove is formed on the outer wall of the inner tube, and a sound and light warning component for triggering the sound and light warning mechanism is arranged in the first groove.

[0021] Beneficial effects: Through the cooperation of the threaded groove and the clamping block, the stability and controllability of the rotating rod and the inner cylinder during movement are ensured, thereby reducing the monitoring error caused by external interference and improving the overall stability and reliability of the monitoring device.

[0022] Furthermore, the sound and light warning component includes a limiting block fixedly connected and arranged obliquely on the inner side wall of the first groove. A fixing frame is fixedly connected to the inner side wall of the lower sleeve. A pressing rod is slidably fitted horizontally in the fixing frame. A second groove is formed on the side of the pressing rod away from the fixing frame. The limiting block is slidably fitted vertically with the second groove.

[0023] A pressure sensor is fixedly connected to the inner side wall of the lower sleeve. The pressure sensor is located in the movement path of the pressing rod. The controller is used to receive the pressure signal sent by the pressure sensor and control the start and stop of the sound and light warning device based on the pressure signal.

[0024] Beneficial effects: Through the combined design of the limiting block, the pressing rod and the pressure sensor, the sound and light warning component quickly triggers the sound and light warning mechanism in the early stage of the risk of ground collapse. This design improves the sensitivity of the warning, enabling the monitoring device to detect and respond to the risk of ground collapse earlier.

[0025] Furthermore, the warning component includes a warning cylinder rotatably connected to the inner bottom wall of the warning box. A second sliding groove is formed on the inner side wall of the warning cylinder. A fixing block is fixedly connected to the side wall of the extension rod. The fixing block is slidably fitted vertically with the second sliding groove.

[0026] A gear ring is fixedly connected to the inner bottom wall of the warning box. A warning rod is fixedly connected to the outer side wall of the warning cylinder. One end of the warning rod away from the warning cylinder is rotatably connected to a first gear. The first gear meshes with the gear ring. A second gear is rotatably connected to the top of the warning rod. The second gear meshes with the first gear.

[0027] A knocking rod is fixedly connected to the top of the second gear. A knocking block is fixedly connected to one end of the knocking rod away from the second gear; a knocking ring is fixedly connected to the top of the gear ring.

[0028] Beneficial effects: The warning component realizes the triggering of the physical warning signal through a mechanical structure without relying on complex electronic components or sensor networks. Therefore, even if the electronic system fails, the warning component can still work normally to ensure the timely issuance of the physical warning signal, thereby further improving the stability and reliability of the monitoring device.

[0029] Furthermore, a plurality of cameras are fixedly connected circumferentially to the outer side wall of the warning box. The controller is used to receive the image information collected by the cameras, send the image information to the cloud processor, and the cloud processor analyzes and processes the image information through the artificial intelligence-enhanced collapse trend analysis technology, and then sends the analyzed and processed image information to the controller, and the controller sends the image information to the staff terminal.

[0030] Beneficial effects: Based on the image information captured by the camera, such as surface cracks and soil displacement, the artificial intelligence-enhanced subsidence trend analysis technology can assist the staff in early warning. This artificial intelligence-based auxiliary vision system enhances the early warning ability of the monitoring device.

[0031] Furthermore, one end of the pressing rod close to the pressure sensor is fixedly connected with a pressing plate.

[0032] Beneficial effects: The design of the pressing plate increases the contact area between the pressing rod and the pressure sensor, making the pressure transmission more uniform and stable, and reducing false alarms or missed alarms caused by poor contact or uneven pressure distribution.

[0033] Furthermore, a counterweight is fixedly connected to the bottom of the inner cylinder.

[0034] Beneficial effects: The design of the counterweight can accurately adjust the center of gravity position of the inner cylinder to make it more balanced, thus improving the stability of the monitoring device.

[0035] Furthermore, the cross-sectional shape of the counterweight is U-shaped.

[0036] Beneficial effects: The design of the counterweight with a U-shaped cross-section makes the center of gravity of the counterweight sink, thereby further improving the balance of the inner cylinder and further enhancing the stability of the monitoring device.

[0037] Furthermore, both the knocking rod and the knocking block are made of elastic rubber material.

[0038] Beneficial effects: When the knocking rod and the knocking block made of rubber material knock the knocking ring, they can buffer the knocking force on each other, thereby reducing the damage to the knocking ring when it is knocked and increasing the service life of the knocking ring.

[0039] Furthermore, the knocking ring is made of titanium alloy material.

[0040] Beneficial effects: Due to the high strength of titanium alloy, the knocking ring can still maintain excellent structural integrity under the repeated knocking of the knocking block, thereby improving the durability of the knocking ring.

[0041] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is an axonometric schematic diagram of the sand stratum ground subsidence monitoring device of the present invention.

[0043] Figure 2 It is a front sectional schematic diagram of the monitoring component in the sand stratum ground subsidence monitoring device of the present invention.

[0044] Figure 3 This is a schematic cross-sectional view of the acoustic-optic warning component in the ground collapse monitoring device of the present invention for sandy strata.

[0045] Figure 4 It is Figure 1 a schematic cross-sectional view along the A-A direction in

[0046] Figure 5 It is Figure 1 a schematic cross-sectional view along the B-B direction in

[0047] The reference numerals in the accompanying drawings of the specification include: 1, acoustic-optic warning device; 2, upper sleeve; 3, warning box; 4, lower sleeve; 5, rotating disc; 6, rotating block; 7, rotating rod; 8, inner cylinder; 9, clamping block; 10, counterweight; 11, limiting block; 12, fixing bracket; 13, pressing rod; 14, pressure sensor; 15, pressing plate; 16, extension rod; 17, warning cylinder; 18, fixing block; 19, gear ring; 20, warning rod; 21, first gear; 22, second gear; 23, knocking rod; 24, knocking block; 25, knocking ring; 26, camera. Detailed implementation manners

[0048] The following is a further detailed description through specific implementation manners:

[0049] Example 1:

[0050] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 : A ground collapse monitoring device for sandy strata includes an acoustic-optic warning device 1. The acoustic-optic warning device 1 is electrically connected to a controller, and the controller is electrically connected to a cloud processor. The controller is used to control the operation of the acoustic-optic warning device 1.

[0051] The bottom of the acoustic-optic warning device 1 is fixedly connected to the upper sleeve 2 by screws. The bottom of the upper sleeve 2 is welded to the warning box 3, and the bottom of the warning box 3 is welded to the lower sleeve 4.

[0052] The inner side wall of the lower sleeve 4 is successively provided with an annular first rotating groove and a second rotating groove from top to bottom. A rotating disc 5 is arranged inside the lower sleeve 4. Rotating blocks 6 are symmetrically and integrally formed on the side wall of the rotating disc 5. The rotating blocks 6 are respectively in rotational cooperation with the first rotating groove and the second rotating groove. First sliding grooves are symmetrically formed between the first rotating groove and the second rotating groove. The rotating blocks 6 are vertically slidably engaged with the first sliding grooves.

[0053] A monitoring component for monitoring the ground collapse situation is arranged below the rotating disc 5.

[0054] The monitoring assembly includes a rotating rod 7 welded to the bottom of the rotating disk 5, a threaded groove is opened on the side wall of the rotating rod 7, an inner cylinder 8 is vertically slidably matched with the inner wall of the lower sleeve 4, and a clamping block 9 is embedded and installed on the inner wall of the inner cylinder 8, and the clamping block 9 is slidably matched with the threaded groove.

[0055] A counterweight block 10 with a U-shaped cross section is welded at the bottom of the inner tube 8, and a first groove is opened on the outer wall of the inner tube 8. An acoustic and light warning component for triggering the acoustic and light warning mechanism is arranged in the first groove.

[0056] The sound and light warning assembly includes a stopper 11 integrally formed and obliquely arranged on the inner side wall of the first groove, a fixing frame 12 is welded to the inner side wall of the lower sleeve 4, and a pressing rod 13 is laterally slidably fitted in the fixing frame 12. Figure 2 As shown, a second groove is formed on the left side of the pressing rod 13, and the limiting block 11 is vertically slidably matched with the second groove.

[0057] The inner wall of the lower sleeve 4 is screwed and fixed with a pressure sensor 14, which is located in the movement path of the pressing rod 13. The controller is used to receive the pressure signal sent by the pressure sensor 14 and control the start and stop of the sound and light warning device 1 based on the pressure signal. Figure 3 As shown, a pressing plate 15 is integrally formed at the left end of the pressing rod 13 .

[0058] An extension rod 16 is coaxially integrally formed on the top of the rotating disk 5 . The extension rod 16 passes through the warning box 3 and extends into the upper sleeve 2 . The warning box 3 is provided with a warning component for issuing a physical warning.

[0059] The warning assembly includes a warning tube 17 rotatably connected to the inner bottom wall of the warning box 3, the inner wall of the warning tube 17 is provided with a second slide groove, and the side wall of the extension rod 16 is integrally formed with a fixing block 18, which vertically slides with the second slide groove.

[0060] A gear ring 19 is welded to the inner bottom wall of the warning box 3, and a warning rod 20 is welded to the outer wall of the warning tube 17. The end of the warning rod 20 away from the warning tube 17 is rotatably connected to a first gear 21, and the first gear 21 is meshed with the gear ring 19. The top of the warning rod 20 is rotatably connected to a second gear 22, and the second gear 22 is meshed with the first gear 21.

[0061] A knocking rod 23 is welded on the top of the second gear 22, and a knocking block 24 is integrally formed on the end of the knocking rod 23 away from the second gear 22. The knocking rod 23 and the knocking block 24 are both made of elastic rubber material; a knocking ring 25 made of titanium alloy material is welded on the top of the gear ring 19.

[0062] The specific implementation process is as follows: In this embodiment, the rotating block 6 is initially located in the first rotating groove. The staff sets the pressure threshold of the pressure sensor 14 through the controller. Then, the staff installs the lower part of the monitoring device in the formation at the position to be detected, ensuring that the counterweight 10 is in contact with the formation. At this time, the monitoring device continuously monitors the ground subsidence situation of the current formation.

[0063] When there is a ground subsidence situation, the formation below the counterweight 10 sinks, and the counterweight 10 moves downward under its own gravity, driving the inner cylinder 8 to move downward with it. During the downward movement of the inner cylinder 8, the clamping block 9 is driven to move downward with it. As Figure 2 shown, during the downward movement of the clamping block 9, it slides in the thread groove, thereby driving the rotating rod 7 to rotate. During the rotation of the rotating rod 7, the rotating disk 5 is driven to rotate, the rotating disk 5 drives the rotating block 6 and the extension rod 16 to rotate, and the extension rod 16 drives the fixed block 18 to rotate.

[0064] As Figure 4 shown, since the fixed block 18 is vertically slidably matched with the second chute, the second chute plays a limiting role on the fixed block 18, so that when the extension rod 16 rotates, it will drive the warning cylinder 17 to rotate with it.

[0065] During the rotation of the warning cylinder 17, the warning rod 20 is driven to rotate. At this time, the first gear 21 makes a circular motion around the extension rod 16 under the drive of the warning rod 20, and at the same time, the first gear 21 rotates self - driven under the meshing action of the toothed ring 19. During the self - rotation of the first gear 21, it will drive the second gear 22 to rotate self - driven. The second gear 22 drives the knocking rod 23 to rotate, and the knocking rod 23 drives the knocking block 24 to rotate with it, so that the knocking block 24 periodically knocks on the knocking ring 25, using the knocking sound as a physical warning signal to send a physical warning to the staff. The staff judges the ground subsidence speed through the knocking frequency.

[0066] As Figure 4 shown, when the rotating block 6 rotates in the first rotating groove to the position of the first chute, the rotating block 6 will slide down to the second rotating groove through the first chute. At this time, if the formation continues to sink, the counterweight 10 will continue to move downward, and then repeat the above movement process.

[0067] Thanks to the optimized design of the first groove and the second groove for the spatial structure, the inner cylinder 8 can slide smoothly in the lower sleeve 4. During the downward movement of the inner cylinder 8, the limiting block 11 is driven to move downward with it. The inclined limiting block 11 drives the pressing rod 13 to move horizontally during the downward movement, and the pressing rod 13 drives the pressing plate 15 to move horizontally to press the pressure sensor 14. When the pressure received by the pressure sensor 14 exceeds the pressure threshold, the pressure sensor 14 sends an acoustic - optical warning signal to the controller, and the controller controls the acoustic - optical warning device 1 to start for acoustic - optical warning.

[0068] Since the physical warning mechanism is achieved by knocking the knocking ring 25 through the knocking block 24 and does not rely on electronic components, when the acoustic-optic warning device 1 fails, the monitoring device can also issue a physical warning, thereby realizing the monitoring and warning of ground collapse.

[0069] The combination of the acoustic-optic warning device 1 and the warning component forms a multi-warning mechanism, enabling the monitoring device to promptly detect the risk of ground collapse. By respectively emitting an acoustic-optic warning signal and a physical warning signal through the acoustic-optic warning device 1 and the warning component, it reminds the staff to take corresponding measures in a timely manner, improving the reliability of the ground collapse warning work.

[0070] Embodiment 2:

[0071] As shown in the attached Figure 1 and Figure 5 figure, the difference from Embodiment 1 is that a plurality of cameras 26 are fixedly connected to the outer side wall of the warning box 3 by circumferential screws. The controller is used to receive the image information collected by the cameras 26, send the image information to the cloud processor, and the cloud processor analyzes and processes the image information through the artificial intelligence-enhanced collapse trend analysis technology, and then sends the analyzed and processed image information to the controller, and the controller sends the image information to the staff terminal.

[0072] The specific implementation process is as follows: When there is a ground collapse, the cameras 26 will perform real-time image acquisition of the ground and send the collected image information to the controller. The controller will send the image information to the cloud processor. At this time, the cloud processor will analyze and process the image information through the artificial intelligence-enhanced collapse trend analysis technology, and send the analyzed and processed image information back to the controller, and send it to the staff terminal through the controller. After receiving the image information, the staff analyzes the ground collapse situation based on the image information and estimates the degree of ground collapse according to the soil displacement situation and the size of the ground cracks.

[0073] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A device for monitoring ground subsidence in a sandy stratum, comprising an acoustic and visual warning device (1), characterized in that: The sound and light warning device (1) is electrically connected to a controller, and the controller is electrically connected to a cloud processor, and the controller is used to control the operation of the sound and light warning device (1); The bottom of the sound and light warning device (1) is fixedly connected to an upper sleeve (2), the bottom of the upper sleeve (2) is fixedly connected to an early warning box (3), and the bottom of the early warning box (3) is fixedly connected to a lower sleeve (4); The inner side wall of the lower sleeve (4) is provided with a first annular rotating groove and a second annular rotating groove in sequence from top to bottom; a rotating disk (5) is provided inside the lower sleeve (4), and a rotating block (6) is symmetrically fixedly connected to the side wall of the rotating disk (5), and the rotating blocks (6) are respectively rotatably matched with the first rotating groove and the second rotating groove, and a first sliding groove is symmetrically provided between the first rotating groove and the second rotating groove, and the rotating blocks (6) are vertically slidably matched with the first sliding groove; A monitoring component for monitoring ground collapse is provided below the rotating disk (5); An extension rod (16) is coaxially fixedly connected to the top of the rotating disk (5), and the extension rod (16) penetrates the warning box (3) and extends into the upper sleeve (2); An early warning component for issuing a physical early warning is arranged in the early warning box (3).

2. The sandy stratum ground subsidence monitoring device according to claim 1 is characterized in that: The monitoring assembly comprises a rotating rod (7) fixedly connected to the bottom of the rotating disk (5), and a thread groove is formed on the side wall of the rotating rod (7); an inner cylinder (8) is vertically slidably matched with the inner wall of the lower sleeve (4), and a clamping block (9) is fixedly connected to the inner wall of the inner cylinder (8), and the clamping block (9) is slidably matched with the thread groove; A first groove is formed on the outer wall of the inner cylinder (8), and a sound and light warning component for triggering the sound and light warning mechanism is arranged in the first groove.

3. The sandy stratum ground subsidence monitoring device according to claim 2 is characterized in that: The sound and light warning assembly comprises a limit block (11) fixedly connected and obliquely arranged on the inner side wall of the first groove; The inner wall of the lower sleeve (4) is fixedly connected to a fixing frame (12), a pressing rod (13) is slidably engaged in the fixing frame (12) in a transverse direction, a second groove is formed on the side of the pressing rod (13) away from the fixing frame (12), and the limiting block (11) is slidably engaged in the second groove in a vertical direction; A pressure sensor (14) is fixedly connected to the inner wall of the lower sleeve (4), and the pressure sensor (14) is located in the movement path of the pressing rod (13). The controller is used to receive the pressure signal sent by the pressure sensor (14) and control the start and stop of the sound and light warning device (1) based on the pressure signal.

4. The sandy stratum ground subsidence monitoring device according to claim 3 is characterized in that: The warning assembly comprises a warning tube (17) rotatably connected to the inner bottom wall of the warning box (3), a second slide groove is formed on the inner side wall of the warning tube (17), a fixing block (18) is fixedly connected to the side wall of the extension rod (16), and the fixing block (18) is vertically slidably matched with the second slide groove; The inner bottom wall of the warning box (3) is fixedly connected with a gear ring (19); the outer side wall of the warning tube (17) is fixedly connected with a warning rod (20); the end of the warning rod (20) away from the warning tube (17) is rotatably connected with a first gear (21); the first gear (21) is meshed with the gear ring (19); the top of the warning rod (20) is rotatably connected with a second gear (22); the second gear (22) is meshed with the first gear (21); A knocking rod (23) is fixedly connected to the top of the second gear (22), and a knocking block (24) is fixedly connected to one end of the knocking rod (23) away from the second gear (22); and a knocking ring (25) is fixedly connected to the top of the gear ring (19).

5. The sandy stratum ground subsidence monitoring device according to claim 4 is characterized in that: A plurality of cameras (26) are fixedly connected to the outer wall of the early warning box (3) in a circumferential direction. The controller is used to receive image information collected by the camera (26) and send the image information to a cloud processor. The cloud processor analyzes and processes the image information using artificial intelligence-enhanced collapse trend analysis technology, and sends the analyzed image information to the controller. The controller sends the image information to a staff terminal.

6. The sandy stratum ground subsidence monitoring device according to claim 5, characterized in that: One end of the pressing rod (13) close to the pressure sensor (14) is fixedly connected to a pressing plate (15).

7. The sandy stratum ground subsidence monitoring device according to claim 6, characterized in that: A counterweight block (10) is fixedly connected to the bottom of the inner cylinder (8).

8. The sandy stratum ground subsidence monitoring device according to claim 7, characterized in that: The cross-section of the counterweight (10) is U-shaped.

9. The sandy stratum ground subsidence monitoring device according to claim 8, characterized in that: The knocking rod (23) and the knocking block (24) are both made of elastic rubber material.

10. The sandy stratum ground subsidence monitoring device according to claim 9, characterized in that: The striking ring (25) is made of titanium alloy material.

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