Goaf feature detection device

Abstract

The utility model discloses a goaf feature detection device, comprising a detection assembly which can extend into a drill hole to carry out recording shooting, three-dimensional coordinate recording, data positioning and radar scanning in the drill hole and is used for collecting drill hole information of the drill hole; the auxiliary assembly comprises a supporting frame, the supporting frame is arranged above the drill hole, a data transmission line is connected to the supporting frame in a sliding mode, and the data transmission line is connected with the detection assembly and used for driving the detection assembly to stretch into the drill hole from the supporting frame; the data conversion module comprises a conversion unit and a display unit, the data conversion unit is connected with the data transmission line, receives the drilling information and converts the drilling information into a three-dimensional geologic model, and the display unit is used for displaying the three-dimensional geologic model. According to the utility model, a refined three-dimensional geologic model of the underlying goaf site of the highway subgrade can be obtained, and the whole device is simple in structure, can be modularly assembled, is easy to assemble and disassemble, and is convenient to use on an engineering site.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of geotechnical engineering exploration, especially to a goaf feature detection device. BACKGROUND

[0002] Highway engineering is linear engineering, and it is inevitable to cross different topography and geological structure units in the construction process. In some areas rich in underground mineral resources, there are a large number of goafs underground, and due to different mining ages and mining methods, combined with illegal mining, the distribution of underground goafs is complex, and the actual distribution of goafs cannot be clearly detected. The current detection method of goafs mainly includes the following aspects: investigating and visiting the geological phenomena such as surface cracks and faulted benches of goafs, and the surrounding residents to understand the mining age of goafs, or using seismic method, transient electromagnetic method, high-density electrical method, etc. By using the reflection, refraction and diffraction phenomena of seismic waves encountering elastic interface, resistivity imaging technology and electromagnetic induction theory, the differences of strata, rocks and cavities are detected to detect the geological structure of goafs. Since the reliability of the investigation and visit data needs to be verified, the actual situation of the underground distribution of goafs cannot be obtained, and the detection accuracy of the seismic method and other methods depends on the seismic data, which is difficult to achieve accurate detection. Moreover, the above detection methods have low detection efficiency and cannot guarantee the detection accuracy. If the highway subgrade construction is carried out in the goaf influence area, it will cause safety hazards to the later operation of the subgrade engineering, lead to subgrade subsidence, and even subgrade collapse. SUMMARY

[0003] The utility model discloses a goaf feature detection device, which can obtain a refined three-dimensional geological model of the goaf site under the highway subgrade by using video visual exploration, three-dimensional laser scanning imaging positioning and radar penetration of geological bodies. The whole device has simple structure, can be modularly assembled, is easy to assemble and disassemble, is convenient for use in engineering site, and can be widely applied to underground structure detection.

[0004] To solve the above technical problems, the embodiment of the utility model discloses a goaf feature detection device for detecting the drill hole in the highway subgrade, obtaining the topographic features of the underground goaf of the highway subgrade, which comprises:

[0005] The detection assembly can extend into the drill hole to record and shoot the drill hole, record three-dimensional coordinates and data positioning and radar scanning, and is used for collecting the drill hole information of the drill hole.

[0006] The auxiliary component includes a support frame disposed above the borehole. A data transmission line is slidably connected to the support frame and connected to the detection component. The data transmission line is used to drive the detection component to extend into the borehole from the support frame and is electrically connected to the detection component to receive and transmit borehole information to the next module.

[0007] The data conversion module includes a conversion unit and a display unit. The data conversion unit is connected to the data transmission line, receives borehole information and converts the borehole information into a three-dimensional geological model, and the display unit is used to display the three-dimensional geological model.

[0008] Using the above technical solution, a detailed three-dimensional geological model of the subgrade mining area can be obtained by using video visual exploration, three-dimensional laser scanning imaging positioning, and radar penetration of geological bodies. The entire device has a simple structure, can be modularly assembled, is easy to assemble and disassemble, is convenient for use on engineering sites, and can be widely used for underground structure detection.

[0009] According to another specific embodiment of the present invention, the detection component is a columnar structure, and along the extending direction of the detection component, it sequentially includes a radar scanning device, a three-dimensional laser scanning device, and a camera device, wherein;

[0010] The radar scanning device is used to scan the borehole and obtain information on the original rock geology around the borehole, as well as the collapse zone, fracture zone, and water inflow in the goaf area.

[0011] The three-dimensional laser scanning device is used to scan the borehole and obtain the three-dimensional coordinate information of the cavity in the surrounding goaf area of ​​the borehole;

[0012] The camera device is used to photograph the inner wall of the borehole and the cavities inside the borehole to obtain internal information about the borehole.

[0013] According to another specific embodiment of the present invention, the present invention discloses that the data transmission line is electrically connected to the radar scanning device, the three-dimensional laser scanning device and the camera device respectively, for transmitting the surrounding original rock geology and information on the collapse zone, fracture zone and water filling of the goaf, as well as the three-dimensional coordinate information and internal information of the cavity of the surrounding goaf, to the data conversion module.

[0014] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a three-dimensional laser scanning device comprising:

[0015] The transmitter and receiver are used to emit a laser beam into the borehole. The receiver receives the laser signal reflected back from the inner wall of the borehole and converts the laser signal into an electrical signal. The receiver then transmits the electrical signal to the data conversion module through a data transmission line.

[0016] The scanning mechanism is used to scan the borehole, acquire the point cloud data of the borehole, and transmit it to the data conversion module via a data transmission line.

[0017] According to another specific embodiment of the present invention, the camera device disclosed in this embodiment includes:

[0018] LED light groups are arranged at equal intervals around the perimeter below the three-dimensional laser scanning device to provide light into the borehole.

[0019] The camera is located at the bottom of the LED light assembly. The camera lens is a wide-angle lens, used to photograph the inner wall of the borehole and the cavities inside the borehole.

[0020] A protective cover is placed over the bottom of the LED light assembly. The protective cover is transparent and houses the camera. The cover is used to protect the camera.

[0021] According to another specific embodiment of the present invention, the auxiliary component further includes a winding device. The winding device is disposed on one side of the drill hole and includes a drum. The data transmission line is wound on the drum and is slidably connected to the support frame after being unwound by the winding device.

[0022] According to another specific embodiment of the present invention, the auxiliary component further includes a fixing frame, which is disposed on the top of the support frame. The fixing frame is provided with a first pulley and a second pulley. The first pulley is disposed on one side of the second pulley, and the height of the first pulley is lower than that of the second pulley in the vertical direction. After the data transmission line passes around the bottom of the first pulley and the top of the second pulley in sequence, it drives the detection component to extend from the support frame into the borehole.

[0023] According to another specific embodiment of the present invention, the auxiliary component further includes a hole depth recorder, which is disposed on the second pulley and is used to record the number of turns of the second pulley to calculate the length of the data transmission line.

[0024] According to another specific embodiment of the present invention, the present invention discloses a data transmission line comprising a steel strand and a data line, wherein the steel strand and the data line are connected by concentric twisting, the data line is disposed at the center of the steel strand, and the steel strand is spirally twisted around the data line.

[0025] According to another specific embodiment of the present invention, the embodiment discloses that multiple boreholes are set up, and a data conversion module acquires multiple borehole data and integrates them to output a three-dimensional geological model.

[0026] The beneficial effects of this application are as follows: by using video visual exploration, three-dimensional laser scanning imaging positioning and radar penetration of geological bodies, a refined three-dimensional geological model of the subgrade mining area can be obtained. Moreover, the entire device has a simple structure, can be modularly assembled, is easy to assemble and disassemble, is convenient for use on engineering sites, and can be widely used in underground structure detection. Attached Figure Description

[0027] Figure 1 This diagram shows a structural schematic of the goaf feature detection device according to an embodiment of the present invention;

[0028] Figure 2 This diagram shows a schematic representation of the camera device according to an embodiment of the present invention.

[0029] Figure 3 This diagram illustrates the structure of the three-dimensional geological model output by the data conversion module in an embodiment of the present invention. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0031] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0033] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0036] Reference Figure 1 and Figure 2 This application provides a goaf feature detection device for detecting boreholes within a highway subgrade to obtain the geomorphological features of the underground goaf area, including:

[0037] Detection component 1, which can extend into the borehole to record and photograph the borehole, record three-dimensional coordinates and data positioning, and perform radar scanning, is used to collect borehole information;

[0038] The auxiliary component 2 includes a support frame 21, which is disposed above the borehole. A data transmission line 22 is slidably connected to the support frame 21. The data transmission line 22 is connected to the detection component 1 and is used to drive the detection component 1 from the support frame 21 into the borehole. It is also electrically connected to the detection component 1 to receive and transmit borehole information to the next module.

[0039] The data conversion module 3 includes a conversion unit and a display unit 31. The data conversion unit is connected to the data transmission line 22, receives borehole information and converts the borehole information into a three-dimensional geological model, and the display unit 31 is used to display the three-dimensional geological model.

[0040] In this embodiment, the borehole layout is determined based on surface reconnaissance and survey data to identify the approximate area of ​​the mining subsidence zone within the roadbed crossing area. A borehole layout map is then established within this approximate area to lay out the boreholes. The borehole spacing is 10m within the roadbed boundary and 20m between the boreholes outside the roadbed boundary and the mining subsidence boundary.

[0041] Geological drilling rigs were selected to conduct drilling according to the borehole layout diagram. In addition to routine geological information, the occurrence of drill bit loss was recorded during the drilling process, which served as an important basis for the extent of the cavity in the goaf.

[0042] A support frame 21 is erected at the borehole opening, and a data transmission line 22 is connected to the detection component 1. The detection component 1 is lowered to the ground level at the borehole opening, and the support frame 21 is adjusted so that the detection component 1 is located at the center of the borehole. The other end of the data transmission line 22 is connected to the data conversion module 3 to record the borehole number and depth.

[0043] The detection component 1 is lowered to the bottom of the borehole, simultaneously acquiring video, 3D point cloud, and radar information until it reaches the bottom. During the retraction process from the bottom of the borehole to the opening, the information inside the borehole is collected again as backup data for the previous data analysis.

[0044] The collected borehole information is comprehensively analyzed using existing mature 3D geological modeling algorithms (such as point cloud data-based triangulation algorithms and geological body voxel modeling algorithms) based on the borehole spatial location, rock layer thickness, lithology, etc., to ultimately achieve a 3D geological model of the entire goaf site.

[0045] Specifically, a camera device 13 is used to record and photograph the inside of the borehole. The camera device 13 includes a high-resolution industrial-grade camera 132 with low-light shooting capability. Its lens has wide-angle characteristics and can cover a large area of ​​the borehole wall to ensure comprehensive recording of the inside of the borehole. It can clearly image the borehole in a relatively dark environment.

[0046] To ensure the shooting effect, the camera device 13 also includes a ring-shaped LED light group 131. The LED light group 131 surrounds the top of the camera 132 and can adjust the brightness in multiple levels according to the drilling depth and light requirements through the adjustment circuit. This ensures that there is sufficient and uniform light from the shallow part to the deep part of the drilling hole, so that the image captured by the camera 132 can clearly show the rock texture, cracks and other features of the inner wall of the drilling hole.

[0047] The camera 132 is equipped with a protective cover 133 to protect the lens. The protective cover 133 is made of reinforced borosilicate glass. Borosilicate glass has high transparency, which can maximize the transmission of light, allowing the camera 132 to receive sufficient lighting for shooting and thus obtain clear images. The reinforced glass can better resist the impact of rock debris, tool collisions, and other external forces that may occur in the borehole, protecting the camera 132 from damage.

[0048] The protective cover 133 is designed in a dome or hemispherical shape, which can reduce the reflection and refraction of light inside the cover, optimize the light propagation path, and provide good structural strength, making it more effective in resisting external impacts from all directions. Its size is adapted to the camera 132, ensuring complete coverage and protection of the camera 132 while minimizing obstruction of the shooting field of view, so that the camera 132 can make full use of the advantages of the wide-angle lens.

[0049] The camera device 13 can also be equipped with a built-in microcontroller and timer to automatically perform shooting operations at preset time intervals. It also supports external manual control shooting, which is convenient for obtaining image data in real time when encountering special geological conditions.

[0050] A three-dimensional laser scanning device 12 is used to record three-dimensional coordinates and data positioning. The three-dimensional laser scanning device 12 includes a transmitter and a receiver. The transmitter is a laser emitter that can emit a laser beam with high power density and stable wavelength to ensure that the laser can effectively reach the target area and generate sufficiently strong reflected light in environments with relatively complex drilling and low light. The receiver uses a high-resolution photodetector that can accurately capture weak laser signals reflected back from the goaf around the borehole and has a large dynamic range to adapt to the laser reflection reception requirements of objects with different distances and reflectivities.

[0051] The three-dimensional laser scanning device 12 also includes a scanning mechanism: employing a precision rotating mirror or galvanometer scanning system, it can achieve omnidirectional, multi-angle scanning of the goaf surrounding the borehole along the columnar extension direction of the detection component 1. The scanning angle range can be set according to the borehole diameter and actual detection range requirements. For example, it can achieve 360° continuous scanning in the horizontal direction, and the vertical scanning angle range covers the entire height range from the bottom to the top of the borehole. The scanning speed can be adjusted according to data accuracy requirements and overall detection efficiency to ensure that sufficient density of point cloud data is acquired within a reasonable time.

[0052] The radar scanning device 11 is a geological radar suitable for underground detection. Its operating frequency range is selected according to the characteristics of highway subgrade and mining area detection to ensure a certain detection depth and good resolution for different media (such as cavities, loose deposits, etc.) in the mining area.

[0053] A directional antenna integrating transmission and reception is employed, with its beamwidth optimized to focus on scanning a specific area of ​​the underground region surrounding the borehole. The antenna is mounted at a specific location on the detection component 1 and can achieve 360° omnidirectional scanning via a rotation mechanism, ensuring comprehensive detection of the geological conditions around the borehole without any blind spots.

[0054] During the insertion of the detection component 1 into the borehole, the radar scanning device 11, the three-dimensional laser scanning device 12, and the camera device 13 operate synchronously. The camera device 13 continuously captures images of the borehole wall; the three-dimensional laser scanning device 12 scans the three-dimensional coordinates of the goaf cavity surrounding the borehole; the radar scanning module continuously emits radar waves around the borehole and receives reflected signals for analysis, scanning the original rock geology around the borehole and the collapse zone, fracture zone, and water filling conditions of the goaf. This ensures that the acquired borehole information accurately and comprehensively reflects the geomorphological characteristics of the goaf area under the highway subgrade.

[0055] The support frame 21 is made of lightweight, high-strength, and corrosion-resistant aluminum alloy, making it easy to transport and install at field road construction sites. Its overall structure is triangular to adapt to the placement requirements above the borehole under different terrain conditions, ensuring that the support frame 21 is placed stably on the ground and will not sway or tilt due to external forces.

[0056] One end of the data transmission line 22 is electrically connected to the detection component 1, and the other end is connected to the data conversion module 3. The sliding connection with the support frame 21 is used to lower the detection component 1 and also to transmit the data collected by the detection component 1 to the data conversion module 3.

[0057] The data conversion module 3 includes a conversion unit and a display unit 31. The conversion unit receives various types of borehole information from the detection component 1, including borehole images, 3D coordinates and data positioning, and radar scan data, through an interface connected to the data transmission line 22. First, it performs an integrity check on this data, eliminating any potentially erroneous or missing data segments. Then, it performs a unified data format conversion, standardizing the data collected by different modules into a format that facilitates subsequent processing. For example, it converts image data into a common bitmap format and converts positioning data and radar scan data into specific numerical matrix forms.

[0058] Existing mature 3D geological modeling algorithms, such as point cloud-based triangulation algorithms and voxel modeling algorithms for geological bodies, are used to integrate and process pre-processed borehole information. Using positioning data as a coordinate reference, the geological structural features reflected in radar scan data and the detailed information of the borehole inner wall presented in the captured images are used to construct a 3D geological model of the goaf area beneath the highway subgrade using specific spatial interpolation and fitting methods. During the modeling process, prior knowledge such as the radar wave reflection characteristics corresponding to different geological media is used to comprehensively analyze the geological bodies in the model based on the spatial location of the boreholes, rock layer thickness, lithology, etc., so that the generated 3D model can intuitively display the distribution of different geomorphic features such as cavities, fissures, and filling materials within the goaf area.

[0059] Display unit 31 uses a high-resolution liquid crystal display (LCD). The screen size is selected based on the actual usage scenario and the need for easy viewing; for example, a large screen of 24 inches or more can be used, featuring high contrast and wide viewing angles, facilitating simultaneous viewing of the model by multiple staff members. The display connects to the conversion unit via common video interfaces such as HDMI or VGA, ensuring stable image transmission.

[0060] Interactive Functionality: The display unit 31 is equipped with a touch function or can be connected to an external mouse, keyboard, or other input devices to enable human-computer interaction. Operators can zoom, rotate, and pan to view the displayed 3D geological model from all angles. They can also select to display detailed information such as specific strata and geomorphological features in the model, facilitating in-depth analysis and research of the situation of mining subsidence areas beneath highway subgrades, and providing a strong basis for subsequent highway maintenance and repair decisions.

[0061] In one feasible embodiment, the auxiliary component 2 further includes a winder 23 disposed on the drilling side, which includes a spool 231 on which a data transmission line 22 is wound. The data transmission line 22 is slidably connected to the support frame 21 after being unwound by the winder 23.

[0062] In this embodiment, the drum 231 is designed as a cylinder to ensure that the data transmission line 22 can be wound neatly and orderly. The drum 231 is made of alloy material, which is convenient for installation and handling, and can withstand the tension generated when the data transmission line 22 is wound, as well as the external forces that may be subjected to during use. At the same time, the surface is anodized to form a dense oxide film, which further improves its wear resistance and corrosion resistance, and extends the service life of the drum 231.

[0063] The drum 231 is connected to the bracket of the winder 23 via bearings, allowing it to rotate flexibly around its axis. During the winding process, the data transmission line 22 is wound onto the drum 231 in a uniform spiral manner. A manual crank coaxial with the drum 231 drives the drum 231 to rotate, thus winding the data transmission line 22. The bracket is also equipped with a locking component to lock the drum 231 when the data transmission line 22 reaches a preset position.

[0064] Winding the data transmission cable 22 onto the reel 231 facilitates its storage, handling, and pre-use inspection, improving the standardization and efficiency of on-site construction. Simultaneously, the neat winding helps to promptly detect issues such as damaged sheaths or exposed wires, allowing for timely maintenance or replacement and ensuring the smooth progress of detection work.

[0065] In one feasible embodiment, the auxiliary component 2 further includes a fixing frame 24, which is disposed on the top of the support frame 21. The fixing frame 24 is equipped with a first pulley 25 and a second pulley 26. The first pulley 25 is disposed on one side of the second pulley 26, and its height is lower than that of the second pulley 26 in the vertical direction. After the data transmission line 22 sequentially wraps around the bottom of the first pulley 25 and the top of the second pulley 26, it drives the detection component 1 to extend from the support frame 21 into the borehole. A hole depth recorder 27 is also included, disposed on the second pulley 26. The hole depth recorder 27 is used to record the number of turns of the second pulley 26 to calculate the length of the data transmission line 22.

[0066] The fixing frame 24 is a frame structure with a support plate at the top. A first pulley 25 and a second pulley 26 are installed on the top of the support frame 21. The fixing frame 24 is mounted on top of the support frame 21 and is securely connected to the support frame 21 using anchor bolts or slots. The pulleys on the fixing frame 24 cooperate with the data transmission line 22 released from the winder 23 and the sliding track on the support frame 21 to form a complete data transmission line guiding and lowering system. After the data transmission line 22 is released from the winder 23's drum 231, it is first guided through a guide tube on one side of the fixing frame 24 to the bottom of the first pulley 25, then around the top of the second pulley 26, and then extends along the sliding track of the support frame 21 into the borehole to connect with the detection component 1. This coordinated design enables the smooth and accurate lowering and retrieval of the data transmission line 22 to the detection component 1, ensuring the smooth progress of the detection work.

[0067] By properly setting the position and height of the first pulley 25 and the second pulley 26, the data transmission line 22 can pass through the two pulleys along a precise path, achieving a smooth transition from the winder 23 to the support frame 21 and then into the borehole. This avoids problems such as jamming, knotting, or detachment of the transmission line from the pulleys during the transition, ensuring that the data transmission line 22 can be laid down stably. This, in turn, drives the detection component 1 to enter the borehole accurately and at a uniform speed for detection operations, improving the reliability of the detection work and the accuracy of data acquisition.

[0068] The borehole depth recorder 27 uses an encoder as its core sensor. The encoder is mounted on the shaft of the second pulley 26 and rotates coaxially with it, enabling precise measurement of the pulley's rotation angle and number of rotations. When the data transmission line 22 drives the second pulley 26 to rotate, the encoder outputs pulse signals in real time. These pulse signals are transmitted to the built-in counter of the borehole depth recorder 27 for accumulation. The microprocessor inside the borehole depth recorder 27 calculates the length of the data transmission line 22 based on preset pulley circumference parameters and the encoder's pulse resolution using a mathematical formula (lowering length = pulley circumference × cumulative rotations), thereby indirectly determining the depth position of the detection component 1 within the borehole. Simultaneously, to improve measurement accuracy, the expansion coefficient of the data transmission line 22 (a small change in length due to material, tension, etc.) and the sliding friction of the pulley are considered. Appropriate compensation algorithms are used to correct the calculation results, ensuring the accuracy of the borehole depth measurement.

[0069] In one feasible embodiment, the data transmission line 22 includes a steel strand and a data line, which are connected by concentric twisting. The data line is located at the center of the steel strand, and the steel strand is spirally twisted around the data line.

[0070] In this embodiment, the steel strand and the data cable are generally combined in a concentric twisting manner. The data cable is placed at the center of the steel strand, and the steel strand is evenly twisted around the data cable in a spiral shape using a specific twisting device.

[0071] Steel strands are typically made of carbon steel wire or alloy steel wire. They effectively resist weathering, oxidation, and other adverse conditions, extending their service life. As a crucial component of the data transmission line 22, the steel strand primarily provides mechanical support. It can withstand the tensile, compressive, and other external forces encountered by the data transmission line 22 during laying and use.

[0072] The conductors of data cables are generally made of highly conductive metals, commonly copper or copper alloys. Pure copper has excellent conductivity and low resistance, ensuring that data signals are transmitted with low loss; while copper alloys (such as copper-tin alloys, copper-silver alloys, etc.) maintain good conductivity while also improving the conductor's strength, wear resistance, and corrosion resistance.

[0073] An insulating layer is wrapped around the outside of the conductor to prevent electrical faults such as short circuits and leakage between conductors and between the conductor and the external environment.

[0074] In one feasible embodiment, multiple boreholes are set up, and the data conversion module 3 acquires multiple borehole data and integrates them to output a three-dimensional geological model.

[0075] In this embodiment, each borehole is numbered according to the borehole layout diagram, and the borehole depth data of each borehole is recorded according to the borehole depth recorder 27. The individual borehole information of each borehole is imported into the data conversion module 3. The borehole information is comprehensively analyzed according to the borehole spatial location, rock layer thickness, lithology, etc., and finally a three-dimensional geological model of the entire goaf site is obtained.

[0076] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A goaf feature detection device for detecting a borehole in a highway embankment to obtain a topographic feature of a goaf under the highway embankment, characterized in that, The utility model relates to a kind of drilling information acquisition device, including: Detection assembly can extend into the borehole to the borehole is recorded shooting, record three-dimensional coordinate and data positioning and radar scanning, for the borehole information of the borehole is collected; Auxiliary assembly, which includes a support frame, is disposed above the borehole. A data transmission line is slidably connected to the support frame. The data transmission line is connected to the detection assembly for driving the detection assembly to extend into the borehole from the support frame and electrically connected to the detection assembly for receiving and transmitting the borehole information to the next module; Data conversion module includes a conversion unit and a display unit. The data conversion unit is connected to the data transmission line to receive the borehole information and convert it into a three-dimensional geological model. The display unit is used to display the three-dimensional geological model.

2. The gob characteristic detection device of claim 1, wherein, The detection assembly is a cylindrical structure. Along the extension direction of the detection assembly, it includes a radar scanning device, a three-dimensional laser scanning device, and a camera device in sequence. The radar scanning device is used to scan the borehole to obtain the surrounding rock geology and information of the caving zone, fractured zone, and water filling zone. The three-dimensional laser scanning device is used to scan the borehole to obtain the three-dimensional coordinate information of the cavity in the surrounding goaf. The camera device is used to take pictures of the inner wall of the borehole and the cavity inside the borehole to obtain the internal information of the borehole.

3. The gob characterization apparatus of claim 2, wherein, The data transmission line is electrically connected to the radar scanning device, the three-dimensional laser scanning device, and the camera device, respectively, for transmitting the surrounding rock geology and information of the caving zone, fractured zone, and water filling zone, the three-dimensional coordinate information of the cavity in the surrounding goaf, and the internal information to the data conversion module.

4. The gob characterization apparatus of claim 3, wherein, The three-dimensional laser scanning device includes: A transmitter and a receiver. The transmitter is used to emit a laser beam into the borehole. The receiver receives the laser signal reflected by the inner wall of the borehole and converts it into an electrical signal. The receiver transmits the electrical signal to the data conversion module through the data transmission line. A scanning mechanism is used to scan the borehole to obtain point cloud data of the borehole and transmit it to the data conversion module through the data transmission line.

5. The gob characterization apparatus of claim 3, wherein, The camera device includes: An LED lamp group is arranged circumferentially and equally spaced below the three-dimensional laser scanning device to provide light source to the borehole. A camera is arranged at the bottom of the LED lamp group. The lens of the camera is a wide-angle lens for taking pictures of the inner wall of the borehole and the cavity inside the borehole. A protective cover is arranged at the bottom of the LED lamp group. The protective cover is a transparent protective cover. The camera is arranged in the protective cover to protect the camera.

6. The gob characterization apparatus of claim 1, wherein, The auxiliary assembly further includes a wire winder arranged on one side of the borehole. The wire winder includes a reel. The data transmission line is wound on the reel. After the data transmission line is unwound from the wire winder, it is slidably connected to the support frame.

7. The gob characterization apparatus of claim 6, wherein, The auxiliary assembly further comprises a fixing frame arranged on the top of the support frame, the fixing frame is provided with a first pulley and a second pulley, the first pulley is arranged on one side of the second pulley, and the height of the first pulley is lower than that of the second pulley in the vertical direction, the data transmission line is wound around the bottom of the first pulley and the top of the second pulley in sequence, and the detection assembly is driven by the data transmission line to extend into the drill hole from the support frame.

8. The gob characterization apparatus of claim 7, wherein, The auxiliary assembly further comprises a hole depth recorder arranged on the second pulley, the hole depth recorder is used for recording the number of turns of the second pulley to calculate the length of the data transmission line.

9. The gob characterization apparatus of claim 1, wherein, The data transmission line comprises a steel strand and a data line, the steel strand and the data line are connected by concentric stranding, the data line is arranged at the center of the steel strand, and the steel strand is spirally stranded around the data line.

10. The gob characterization apparatus of claim 1, wherein, The drill holes are arranged in plurality, the data conversion module acquires and integrates the drill hole data to output the three-dimensional geological model.

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