Embedded road collapse automatic monitoring and early warning device and early warning method

Abstract

The present invention relates to the technical field of road collapse early warning, and more specifically to an embedded road collapse automatic monitoring and early warning device and an early warning method, comprising: a borehole extending from a road surface layer to a target soil layer; a first anchoring structure, arranged at the bottom of the borehole and anchored to the target soil layer; a second anchoring structure, arranged at the top of the borehole and anchored to the road surface layer, wherein a stress detection component is arranged in the second anchoring structure. The present invention sets two anchor points at the road surface layer and the target soil layer respectively, and the two anchor points are connected by a rigid rod or elastic rod that bears pressure, so as to maintain the same thrust on the two anchor points, and monitor the thrust of the upper anchor point to determine whether the soil layer at the lower anchor point is loose. Once the soil of the target soil layer is loose, the rod with prestress between the two anchor points will release the stress, so as to be detected by the pressure detection component, and give an early warning of the collapse of the lower soil layer.

Description

Technical Field

[0001] The present invention relates to the technical field of road collapse early warning, and in particular to an embedded road collapse automatic monitoring and early warning device and an early warning method. Background Art

[0002] Road collapse is the process and phenomenon in which a road sinks downward due to natural or human factors, forming depressions or potholes on the road surface. In order to ensure the safe and smooth operation of urban infrastructure, ground penetrating radar is generally used to detect underground disease bodies on municipal roads, and to investigate and rectify underground disease bodies on urban roads.

[0003] Specifically, it includes: conducting geological radar detection on roads within the specified range, finding out whether there are abnormal defects such as cavities and voids in the soil below the road surface and around the pipelines within the specified range, finding out the basic parameters such as the location, size, and burial depth of the abnormalities, and assessing the risk level. It provides basic data for construction, design, and construction units so that they can take effective measures to eliminate safety hazards and ensure the safety of roads, buildings, and surrounding environments within the detection area.

[0004] Although regular geological radar detection can reflect the collapse of urban roads to a certain extent, the workload is too large, especially the selection of detection range and frequency is difficult. The prediction of risks depends on the frequency of detection. High-frequency detection will undoubtedly increase the burden on the municipal government, while low-frequency detection will bring safety hazards.

[0005] For example, as shown in Patent Document 1, although the pre-buried detection method can accurately reflect the development of holes, it is not suitable for use on roads that are already in use. Therefore, after the underground holes are detected by geological radar, how to conduct continuous, real-time, accurate, and low-cost effective monitoring of the holes becomes an urgent problem to be solved.

[0006] Prior art literature

[0007] Patent document 1CN115240368A An IoT system for monitoring and early warning of urban road collapse Summary of the invention

[0008] The first aspect of the present invention proposes a technical solution, an embedded road collapse automatic monitoring and early warning device, comprising:

[0009] A borehole extending from the road surface to the target soil layer;

[0010] a first anchoring structure, arranged at the bottom of the borehole and anchored to the target soil layer;

[0011] a second anchoring structure, arranged at the top of the borehole and anchored to the road surface, wherein a stress detection component is arranged in the second anchoring structure;

[0012] A probe rod, a first end of which is connected to the first anchoring structure, and a second end of which is connected to the stress detection component;

[0013] Wherein, the probe rod is configured to be in an energy storage state, and has a tendency to release energy in the direction of the first anchoring structure and the stress detection component. The probe rod keeps applying stress to the first anchoring structure and the stress detection component, and the stress detection component is configured to detect stress changes of the probe rod.

[0014] Preferably, the first anchoring structure comprises a pressure plate and a sleeve, the pressure plate is configured to allow movement from the top to the bottom of the borehole and to be attached to the bottom of the borehole, and the bottom of the pressure plate is a plane.

[0015] Preferably, the upper end surface of the pressure plate is provided with a sleeve for the probe rod to extend into, and the probe rod extends into the sleeve and contacts the upper end surface of the pressure plate, so that the first end of the probe rod has a determined position on the upper end surface of the pressure plate.

[0016] Preferably, the second anchoring structure includes a shell, a cavity is provided inside the shell, the stress detection component is arranged in the cavity, a channel is provided at the bottom of the shell for the probe rod to penetrate, the channel is connected to the cavity, and the probe rod penetrates through the channel through a drilled hole to collide with the stress detection component.

[0017] Preferably, the second anchoring structure also includes a threaded column, the outer wall of the threaded column is provided with threads, the channel of the shell is provided with threads, the threaded column is threadedly connected to the shell, the stress detection component is fixed to the threaded column, and the threaded column is provided with a channel for the probe rod to contact the stress detection component.

[0018] Preferably, a first channel section and a second channel section are provided inside the threaded column, the first channel section is provided with an internal thread, the stress detection component is threadedly connected to the first channel section, the lower end face of the stress detection component is a stress detection end, the diameter of the first channel section is larger than the diameter of the second channel section, a step is formed between the first channel section and the second channel section, a spring is provided between the stress detection component and the step, and the second end of the probe rod is connected to the spring.

[0019] Preferably, the outer wall of the threaded column is provided with a clamping groove distributed along the axial direction thereof, and a clamping block capable of clamping the clamping groove is provided in the cavity, so that the threaded column and the housing are relatively fixed.

[0020] Preferably, an anchoring structure is provided on the shell, and the anchoring structure includes rivets distributed perpendicular to the drilling axis.

[0021] Preferably, the probe rod is an elastic rod.

[0022] The second aspect of the present invention proposes a technical solution, a method for automatic monitoring and early warning of buried road collapse, using the above-mentioned automatic monitoring and early warning device for buried road collapse, comprising the following steps:

[0023] Step 1: Use a drilling tool to form a borehole extending from the road surface layer to the target soil layer;

[0024] Step 2: Arrange the first anchoring structure, the second anchoring structure and the probe rod;

[0025] Step 3: Detect the stress of the probe rod through the stress detection component, and regularly send the collected signal to the server to determine whether the target soil layer collapses according to the stress of the probe rod;

[0026] Among them, in the step, when the probe rod is arranged, the threaded column is rotated to change the relative position of the threaded column and the shell, so that the distance between the first end and the second end of the probe rod changes, thereby controlling the initial stress of the probe rod.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] The present invention sets two anchor points on the road surface and the target soil layer respectively. The two anchor points are connected by a rigid rod or elastic rod that bears pressure, so as to maintain the same thrust on the two anchor points. By monitoring the thrust on the upper anchor point, it can be determined whether the soil layer of the lower anchor point is loose. Once the soil of the target soil layer is loose, the prestressed rod between the two anchor points will release the stress so as to be monitored by the pressure detection component, thereby giving an early warning of the collapse of the soil layer below. The early warning device of the present application has little damage to the road and a simple structure, and is suitable for providing targeted collapse early warnings at hollow locations detected on the road. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0030] Figure 1 It is a schematic diagram of the road surface layer collapsing downwards shown in the present invention;

[0031] Figure 2 It is a structural schematic diagram of the buried road collapse automatic monitoring and early warning device shown in the present invention;

[0032] Figure 3 is a structural schematic diagram of a first anchoring structure shown in the present invention;

[0033] Figure 4 is a structural schematic diagram of a second anchoring structure shown in the present invention;

[0034] Figure 5 is another structural schematic diagram of the second anchoring structure shown in the present invention;

[0035] Figure 6 It is a structural schematic diagram of the threaded column shown in the present invention;

[0036] Figure 7 This is a schematic diagram of the probe rod in a compressed state shown in the present invention.

[0037] Figure 8 It is a schematic diagram of the probe rod shown in the present invention in a stress-released state. DETAILED DESCRIPTION

[0038] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0039] Combination Figure 1 As shown, the road surface layer 100 is usually a paved road surface such as asphalt, cement, gravel, etc., below the road surface layer 100 is the road base layer, and below the road base layer is the soil layer. Generally, pipes 201 such as water pipes and electric wire pipes are buried at the bottom of urban roads. In particular, hollowing 202 is prone to occur around the water pipes 201. With the increase of time and the effect of the water environment, the hollowing 202 gradually develops into a cavity 200. The cavity 200 and the road surface layer 100 are defined as a hard shell layer. At this time, the hard shell layer is sufficient to support the load on the road surface layer 100. When the cavity 200 gradually expands, the road surface layer 100 may collapse slightly, as shown in the collapsed area 100". It is also possible that the cavity 200 expands to the point where the hard shell layer cannot support the load of the road surface layer 100, and a collapse pit is formed on the road surface.

[0040] Among them, the directly formed collapse pits are very harmful and sudden. At present, ground penetrating radar is generally used for underground holes, which has a long detection cycle and cannot accurately predict the development of the cavity. The use of, for example, a magnetoresistive stratified sedimentation meter to warn of collapse has limitations. It specifically detects the displacement of the soil layer, and when the displacement occurs, the soil layer has already loosened and cannot provide early warning. The present application aims to detect the soil force of the target soil layer 102, and two anchor points are respectively set on the road surface layer 100 and the target soil layer 102. The two anchor points are connected by a prestressed probe rod 20, and the probe rod 20 is in a compressed state. When the target soil layer 102 loosens, the compressive stress of the probe rod 20 is released, and it is determined that the target soil layer 102 is about to collapse. In this way, by detecting the stress of the target soil layer 102, early warning of the development of underground holes can be provided.

[0041] It should be understood that the structural layer between the road surface layer 100 and the target soil layer 102 is defined as the hard shell layer 101. The hard shell layer 101 is a structure that can support the load on the road surface layer 100. If the hard shell layer 101 is destroyed (the bottom develops into a cavity 200), the road surface is at risk of collapse. Optionally, the thickness of the hard shell layer is 2-3m, which is determined by the strength of the soil layer. The soil layer below the target soil layer 102 is the hole erosion layer 103.

[0042]

Buried road collapse automatic monitoring and early warning device

[0043] Combination Figure 2 As shown, the first aspect of the present invention proposes a technical solution, an embedded road collapse automatic monitoring and early warning device, including a borehole 40, a first anchoring structure 30, a second anchoring structure 10 and a probe 20, the borehole 40 extends from the road surface layer 100 to the target soil layer 102; the first anchoring structure 30 is set to the bottom of the borehole 40 and anchored to the target soil layer 102; the second anchoring structure 10 is set to the top of the borehole 40 and anchored to the road surface layer 100, wherein the second anchoring structure 10 is provided with a stress detection component 13; the first end of the probe 20 is connected to the first anchoring structure 30, and the second end is connected to the stress detection component 13.

[0044] Furthermore, the probe rod 20 is configured to be in an energy storage state, with a tendency to release energy toward the first anchoring structure 30 and the stress detection component 13. The probe rod 20 maintains applying stress to the first anchoring structure 30 and the stress detection component 13, and the stress detection component 13 is configured to detect stress changes in the probe rod 20.

[0045] In this way, the two ends of the probe rod 20 are anchored to the road surface 100 and the target soil layer 102 respectively, and compressive stress is applied through the probe rod 20 to put it in an energy storage state. The probe rod 20 has a tendency to release energy to the two anchoring ends, that is, there is pressure on both the road surface 100 and the target soil layer 102. The present invention judges the state of the soil structure according to the pre-pressure on the target soil layer 102. When the target soil layer 102 can withstand and maintain support for the probe rod 20, the soil layer structure is complete. Once the soil layer structure becomes loose, it cannot withstand the pre-pressure, so that the pressure of the probe rod 20 is released. Therefore, the stress detection component 13 can monitor the stress change of the probe rod 20. When the stress of the probe rod 20 is released, especially when the stress is reduced to less than 30% of the initial stress, it can be explained that the structural layer of the target soil layer 102 has been loosened.

[0046] In a specific embodiment, in order to improve the monitoring accuracy and reliability, the first anchoring structure 30 should maintain a large contact area with the soil layer and should not have a sharp angle to prevent it from continuously embedding into the soil under the action of stress. Figure 3As shown, the first anchoring structure 30 includes a pressure plate 31 and a sleeve 32. The pressure plate 31 is configured to allow movement from the top to the bottom of the borehole 40 and to be attached to the bottom of the borehole 40. The bottom of the pressure plate 31 is a plane.

[0047] Optionally, the cross-sectional shape of the pressure plate 31 is circular, which is the same as the diameter of the borehole 40. In this way, the contact area with the bottom of the borehole 40 can be increased to the maximum extent, preventing the pressure plate 31 from causing a large amount of extrusion and deformation to the soil layer.

[0048] Furthermore, the upper end surface of the pressure plate 31 is provided with a sleeve 32 for the probe rod 20 to extend into. The probe rod 20 extends into the sleeve 32 and contacts the upper end surface of the pressure plate 31, so that the first end of the probe rod 20 has a determined position on the upper end surface of the pressure plate 31.

[0049] In this way, after the probe rod 20 is compressed, the end in contact with the pressure plate 31 is fixed and will not deviate or slide, thereby ensuring that the stress remains in a stable state, which is beneficial for the later monitoring of stress changes.

[0050] Combination Figure 4 As shown, the second anchoring structure 10 includes a shell 11, a cavity 111 is provided inside the shell 11, a stress detection component 13 is arranged in the cavity 111, and a channel for the probe rod 20 to penetrate is provided at the bottom of the shell 11, the channel is connected to the cavity 111, and the probe rod 20 penetrates from the channel through the drill hole 40 and hits the stress detection component 13.

[0051] The shell 11 is constructed in a cylindrical shape, with an outwardly extending edge on the upper part. The edge has anchor holes that can be penetrated by anchor nails or bolts to fix the shell 11 to the road surface 100. A cavity 111 is provided on the inner side of the shell 11, and a through hole communicating with the cavity 111 is provided on the bottom.

[0052] Furthermore, in order to ensure that the shell 11 can be reliably fixed to the road surface 100 under prestressed conditions, it is necessary to provide the shell 11 with better anchoring properties. An anchoring structure 19 is provided on the shell 11, and the anchoring structure 19 includes rivets distributed perpendicular to the axis of the drill hole 40.

[0053] Specifically, the rivet is wedged from the cavity 111 of the housing 11 toward the road surface layer 100 .

[0054] A sealing cover 17 is provided above the shell 11, and the cavity 111 provides a relatively sealed environment for the stress detection component 13 and other electronic devices to prevent moisture. A communication and control module 16 is also provided in the cavity 111. Optionally, the communication module supports cellular data connection of low-power devices in the wide area network through narrowband Internet of Things communication. The communication module is used to transmit the collected stress data to the server.

[0055] Preferably, in order to reduce power consumption, the control module controls the pressure sensor to collect data regularly, and the communication module uploads data regularly. Optionally, the collection period is one day, and the upload period is one week. In this way, the power consumption of the device can be greatly reduced.

[0056] The pressure sensor and other electronic components are powered by a battery.

[0057] Optionally, the stress detection component 13 is a pressure sensor, preferably an inductive or string pressure sensor. The pressure sensor can collect the pressure of the probe rod 20 for a long time with low power consumption.

[0058] Furthermore, in order to adjust the initial stress of the probe rod 20, the second anchoring structure 10 also includes a threaded column 12, the outer wall of the threaded column 12 is provided with threads, the channel of the shell 11 is provided with threads, the threaded column 12 is threadedly connected to the shell 11, the stress detection component 13 is fixed to the threaded column 12, and the threaded column 12 is provided with a channel for the probe rod 20 to contact the stress detection component 13.

[0059] Optionally, the probe rod 20 is an elastic rod, for example, an elastic solid or hollow rod made of a polymer material such as stainless steel or PVC.

[0060] In this way, when the lower end of the probe rod 20 is connected to the sleeve 32 of the pressure plate 31, the upper end is at the bottom of the shell 11, the threaded column 12 is put on the outside of the probe rod 20, and the threaded column 12 is rotated to connect the threaded column 12 to the inner wall of the shell 11, wherein the stress detection component 13 is fixed to the top of the threaded column 12. When the threaded column 12 is continuously pressed downward, the probe rod 20 is squeezed downward, so that the compressive stress of the probe rod 20 continues to increase until the preset initial stress is reached.

[0061] The stress change of the probe rod 20 caused by road vibration or thermal expansion and contraction is F1. Preferably, the initial stress given to the probe rod 20 should be F2, wherein F2>10F1.

[0062] Combination Figure 5 As shown, the interior of the threaded column 12 is provided with a first channel section 121 and a second channel section, the first channel section 121 is provided with an internal thread, the stress detection component 13 is threadedly connected to the first channel section 121, the lower end face of the stress detection component 13 is a stress detection end, the diameter of the first channel section 121 is greater than the diameter of the second channel section, a step is formed between the first channel section 121 and the second channel section, a spring 14 is provided between the stress detection component 13 and the step, and the second end of the probe rod 20 is connected to the spring 14.

[0063] In this embodiment, the probe rod 20 may be a rigid rod or an elastic rod.

[0064] A partition 15 is provided at the bottom of the spring 14, and the probe rod 20 is placed under the partition 15. When the probe rod 20 is a rigid rod, the stress detection component 13 is pressed by the elastic force of the spring 14. In this way, the spring 14 is in a relatively closed environment, is not easily affected by moisture, and the stress remains stable for a long time, and the soil layer strength at the bottom of the probe rod 20 can be accurately fed back.

[0065] In the above embodiment, the stress detection component 13 is enclosed in the cavity 111 by using the partition 15, so that the cavity 111 is not damp-proof, and the structures of the electrical components and the force transmission components are reliable.

[0066] In another embodiment, when the probe rod 20 is an elastic rod, the stress detection component 13 is pressed by the combined action of the spring 14 and the probe rod 20 .

[0067] In the above embodiments, combined with Figure 6 As shown, in order to ensure that the threaded column 12 will not loosen and produce axial displacement under stress and vibration conditions, a groove 122 distributed along its axial direction is provided on the outer wall of the threaded column 12, and a block 18 that can clamp the groove is provided in the cavity 111, so that the threaded column 12 and the shell 11 are relatively fixed.

[0068] Specifically, a limiting groove 112 is provided in the cavity 111 . When the threaded column 12 is rotated to a suitable position, the clamping block 18 is placed in the limiting groove 112 and the clamping groove 122 , so that the threaded column 12 and the housing 11 are relatively fixed.

[0069]

Automatic monitoring and early warning method for buried road collapse

[0070] Combination Figure 7-8 As shown, the second aspect of the present invention proposes a technical solution, a method for automatic monitoring and early warning of buried road collapse, using the above-mentioned automatic monitoring and early warning device for buried road collapse, comprising the following steps:

[0071] Step 1: using a drilling tool to form a borehole 40 extending from the road surface layer 100 to the target soil layer 102;

[0072] Step 2, arranging the first anchoring structure 30, the second anchoring structure 10 and the probe rod 20;

[0073] Step 3: Detect the stress of the probe rod 20 through the stress detection component 13, and regularly send the collected signal to the server, and determine whether the target soil layer 102 collapses according to the stress of the probe rod 20;

[0074] In step 2, when the probe rod 20 is arranged, the threaded column 12 is rotated to change the relative position of the threaded column 12 and the housing 11 so that the distance between the first end and the second end of the probe rod 20 changes, thereby controlling the initial stress of the probe rod 20.

[0075] A drilling device is used to drill a borehole 40 extending from the road surface layer 100 to the target soil layer 102, and the probe rod 20 and the first anchoring structure 30 are placed below the bottom of the borehole 40, wherein the probe rod 20 and the sleeve 32 can be connected by a pin; after lowering the probe rod 20 and the sleeve 32, the shell 11 is arranged at the hole mouth, and the shell 11 is fixed to the road surface layer with rivets, and then the threaded column 12 is inserted, and the height of the threaded column 12 is adjusted so that the pressure on the probe rod 20 is within a preset range, and then the stress detection component 13 is connected to the communication and control module 16, and the stress data uploaded by the stress detection component 13 is used to determine whether the cavity at the point has developed to the target soil layer 102.

[0076] Combination Figure 8 As shown, optionally, when cavities develop in the soil layer at the bottom of the probe rod 20, the soil layer below the pressure plate 31 becomes thinner and gradually cannot support the downward pressure of the bearing plate 31. Therefore, when the stress detection component 13 detects that the stress of the probe rod 20 is reduced to less than 30% of the initial stress, it is determined that the soil layer is loose.

[0077] In combination with the above embodiments, the present invention respectively sets two anchor points on the road surface and the target soil layer. The two anchor points are connected by a rigid rod or elastic rod that bears pressure, so as to maintain the same thrust on the two anchor points. By monitoring the thrust of the upper anchor point, it can be determined whether the soil layer of the lower anchor point is loose. Once the soil of the target soil layer is loose, the prestressed rod between the two anchor points will release the stress so as to be monitored by the pressure detection component, thereby giving an early warning of the collapse of the lower soil layer. The early warning device of the present application has little damage to the road and a simple structure, and is suitable for providing targeted collapse early warnings at hollow locations detected on the road.

[0078] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. An embedded road collapse automatic monitoring and early warning device, characterized in that: include: A borehole (40) extending from the road surface layer (100) to the target soil layer (102); A first anchoring structure (30) is arranged at the bottom of the borehole (40) and anchored to the target soil layer (102); A second anchoring structure (10) is arranged on the top of the drill hole (40) and is anchored to the road surface layer (100), wherein a stress detection component (13) is provided in the second anchoring structure (10); A probe rod (20), a first end of which is connected to the first anchoring structure (30), and a second end of which is connected to a stress detection component (13); The probe rod (20) is configured to be in an energy storage state and has a tendency to release energy in the direction of the first anchoring structure (30) and the stress detection component (13); the probe rod (20) keeps applying stress to the first anchoring structure (30) and the stress detection component (13); and the stress detection component (13) is configured to detect stress changes in the probe rod (20); The first anchoring structure (30) comprises a pressure plate (31) and a sleeve (32); the pressure plate (31) is configured to allow movement from the top to the bottom of a borehole (40) and to be attached to the bottom of the borehole (40); the bottom of the pressure plate (31) is a plane.

2. The buried road collapse automatic monitoring and early warning device according to claim 1 is characterized in that: The upper end surface of the pressure plate (31) is provided with a sleeve (32) for the probe rod (20) to extend into. The probe rod (20) extends into the sleeve (32) and contacts the upper end surface of the pressure plate (31), so that the first end of the probe rod (20) has a determined position on the upper end surface of the pressure plate (31).

3. The buried road collapse automatic monitoring and early warning device according to claim 1 is characterized in that: The second anchoring structure (10) comprises a shell (11), a cavity (111) is provided inside the shell (11), the stress detection component (13) is arranged in the cavity (111), a channel for the probe rod (20) to penetrate is provided at the bottom of the shell (11), the channel is connected to the cavity (111), and the probe rod (20) penetrates from the channel through the drill hole (40) to abut against the stress detection component (13).

4. The automatic monitoring and early warning device for buried road collapse according to claim 3 is characterized in that: The second anchoring structure (10) further comprises a threaded column (12), the outer wall of the threaded column (12) being provided with threads, the channel of the housing (11) being provided with threads, the threaded column (12) being threadedly connected to the housing (11), the stress detection component (13) being fixed to the threaded column (12), and the threaded column (12) being provided with a channel for the probe rod (20) to contact the stress detection component (13).

5. The buried road collapse automatic monitoring and early warning device according to claim 4 is characterized in that: The threaded column (12) is provided with a first channel section (121) and a second channel section inside, the first channel section (121) is provided with an internal thread, the stress detection component (13) is threadedly connected to the first channel section (121), the lower end surface of the stress detection component (13) is a stress detection end, the diameter of the first channel section (121) is larger than the diameter of the second channel section, a step is formed between the first channel section (121) and the second channel section, a spring (14) is provided between the stress detection component (13) and the step, and the second end of the probe rod (20) is connected to the spring (14).

6. The buried road collapse automatic monitoring and early warning device according to claim 4 or 5, characterized in that: The outer wall of the threaded column (12) is provided with a clamping groove (122) distributed along the axial direction thereof, and the cavity (111) is provided with a clamping block (18) capable of clamping the clamping groove, so that the threaded column (12) and the housing (11) are relatively fixed.

7. The buried road collapse automatic monitoring and early warning device according to claim 3 is characterized in that: An anchoring structure (19) is provided on the shell (11), and the anchoring structure (19) comprises rivets distributed perpendicularly to the axis of the drill hole (40).

8. The buried road collapse automatic monitoring and early warning device according to claim 1 is characterized in that: The probe rod (20) is an elastic rod.

9. An automatic monitoring and early warning method for buried road collapse, characterized in that: The embedded road collapse automatic monitoring and early warning device according to any one of claims 1 to 8 comprises the following steps: Step 1: using a drilling tool to form a borehole (40) extending from a road surface layer (100) to a target soil layer (102); Step 2: arranging the first anchoring structure (30), the second anchoring structure (10) and the probe rod (20); Step 3: Detecting the stress of the probe rod (20) by means of the stress detection component (13), and regularly sending the collected signal to the server, and judging whether the target soil layer (102) has collapsed according to the stress of the probe rod (20); Wherein, in step 2, when the probe rod (20) is arranged, the threaded column (12) is rotated to change the relative position of the threaded column (12) and the housing (11), so that the distance between the first end and the second end of the probe rod (20) changes, thereby controlling the initial stress of the probe rod (20).

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