Tunnel over-break and under-break detection device and detection method thereof

Abstract

The present invention discloses a tunnel over-excavation and under-excavation detection device, including a central computer processor and a detection feedback body, wherein the central computer processor is arranged inside the detection feedback body, and a plurality of telescopic rods are arranged between the detection feedback body and the central computer processor, wherein the telescopic ends of the telescopic rods are detachably connected to the detection feedback body, and the ends of the telescopic rods away from the telescopic ends are connected to the outer side of the central computer processor. The present invention also provides a detection method, including the following steps: S1, during the forward movement of the tunnel over-excavation and under-excavation detection device, point cloud data of the tunnel cross-sectional profile is generated by a scanner; S2, specific data of tunnel over-excavation and under-excavation are measured by the detection feedback body, and the over-excavation and under-excavation positions of the tunnel are marked one by one, and numbered; S3, the point cloud data and the data obtained by the detection feedback body are respectively transmitted to the central computer processor for pre-processing; S4, the pre-processed data is fitted, compared with the tunnel design value, and the over-excavation and under-excavation status of the current data is calculated.

Description

Technical Field

[0001] The invention belongs to the field of tunnel over-break and under-break detection, and in particular relates to a tunnel over-break and under-break detection device and a detection method thereof. Background Art

[0002] With the further improvement of urbanization level, the urban population is showing an explosive growth trend. In order to ease the pressure of urban traffic environment, more and more cities choose to build urban subways as a solution.

[0003] During the construction of subway tunnels, due to the cumulative influence of geology, blasting, etc., over-excavation and under-excavation are prone to occur. When there is over-excavation and under-excavation in the tunnel, there will be a difference between the actual excavation contour of the tunnel and the designed contour. The uneven contour of the actual excavation causes the stress exerted by the tunnel surrounding rock on the support structure to produce local stress concentration, making the initial support structure unstable. In actual engineering construction, over-excavation is inevitable, and over-excavation can be controlled within an acceptable range through construction technology control and equipment control. However, under normal circumstances, over-excavation and under-excavation are not allowed. Strict control of over-excavation and under-excavation is of great significance to smooth construction, saving of equipment and human resources, and production safety.

[0004] Traditional tunnel over-break and under-break detection is mainly based on manual measurement, using equipment such as profilers or total stations to measure the entire tunnel section by section. This method is time-consuming and labor-intensive, and the equipment required for measurement is bulky, making it difficult to complete the detection on time during the short window period when subway vehicles stop running. In order to successfully complete the overall tunnel construction, a reliable and fast tunnel over-break and under-break detection system is of great application value. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a tunnel over-break and under-break detection device and a detection method thereof. The present invention can conveniently and quickly automatically process and analyze data and detect over-break and under-break status. It is simple to operate and easy to carry.

[0006] The first object of the present invention is to provide a tunnel over-excavation and under-excavation detection device, comprising a central computer processor and a detection feedback body, wherein the central computer processor is arranged inside the detection feedback body, and a plurality of telescopic rods are arranged between the detection feedback body and the central computer processor, wherein the telescopic end of each telescopic rod is detachably connected to the detection feedback body, and an end of each telescopic rod away from the telescopic end is connected to the outer side surface of the central computer processor.

[0007] Preferably, the detection feedback body comprises a fixed annular steel frame and a movable annular steel belt, the movable annular steel belt is arranged on the outside of the fixed annular steel frame, and the telescopic ends of the telescopic rod are respectively connected to the fixed annular steel frame and the movable annular steel belt.

[0008] Preferably, a plurality of induction detection mechanisms are evenly spaced along the circumferential direction between the fixed annular steel frame and the movable annular steel belt.

[0009] Preferably, each of the induction detection mechanisms includes a limit groove, a spring, a pressure strain gauge and a limit column, the limit groove is opened on the outer side of the fixed annular steel frame, the pressure strain gauge is arranged at the bottom of the limit groove, one end of the spring is connected to the pressure strain gauge, and the other end of the spring is connected to the limit column, and the movable end of the limit column is in contact with the inner side surface of the movable annular steel belt.

[0010] Preferably, the central computer processor includes a signal conversion module, a signal indicator light, an industrial computer and a power supply module. The input end of the signal conversion module is connected to the pressure strain gauge through a wire, the output end of the signal conversion module is connected to the input end of the signal indicator light, and the power supply module is electrically connected to the signal conversion module, the signal indicator light and the industrial computer respectively.

[0011] Preferably, wheels are respectively provided on the top and bottom of the outer side surface of the fixed annular steel frame, and tilt sensors are provided on the wheels.

[0012] Preferably, a scanner is disposed on the front side of the central computer processor, the scanner is electrically connected to the central computer processor via a wire, and a fixing rod is disposed on the rear side of the central computer processor.

[0013] A second object of the present invention is to provide a detection method of the above-mentioned tunnel over-break and under-break detection device, comprising the following steps:

[0014] S1. Move the tunnel overbreak and underbreak detection device to the tunnel section that needs to be measured. During the forward movement of the tunnel overbreak and underbreak detection device, generate point cloud data of the tunnel section contour by using a laser point cloud scanner;

[0015] S2. During the process of the tunnel over-break and under-break detection device moving forward, the specific data of the tunnel over-break and under-break are measured by detecting the feedback body, and the over-break and under-break positions of the tunnel are marked one by one and numbered;

[0016] S3, transmitting the point cloud data obtained in step S1 and the data obtained by the detection feedback body obtained in step S2 to the central computer processor through wires, and converting the transmitted electrical signals into specific data to obtain point cloud pre-processing data and tunnel over-excavation and under-excavation pre-processing data;

[0017] S4. Fitting the point cloud preprocessing data obtained in step S3 and the tunnel over-break and under-break preprocessing data in the central computer processor, extracting the tunnel section contour line, and then comparing it with the tunnel design value, calculating the over-break and under-break status of the current data, and then judging whether corresponding measures need to be taken.

[0018] Preferably, in step S2, the specific steps for the detection feedback body to measure the specific data of tunnel over-excavation and under-excavation are as follows: during the forward movement of the tunnel over-excavation and under-excavation detection device, the movable annular steel belt contacts the tunnel section, and the movable annular steel belt generates corresponding deformation according to different excavation conditions of the tunnel section, so that the limit column is displaced, and the limit column extrusion spring is deformed to cause the pressure strain gauge to generate pressure, and the pressure strain gauge will deform to generate resistance, which is converted into an electrical signal through a signal conversion module, thereby generating an electrical signal, and a small light bulb is lit through a signal indicator light, and the approximate situation of the tunnel section can be judged by the brightness of the small light bulb, and at the same time, the electrical signal is transmitted to the central computer processor for processing, and the size of the current signal is converted into the corresponding spring deformation to obtain the specific data of tunnel over-excavation and under-excavation.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The detection device provided by the present invention contacts the tunnel section through the movable annular steel belt. The movable annular steel belt produces corresponding deformation, so that the cylindrical steel column produces vertical displacement. The cylindrical steel column squeezes the spring to deform. The spring deformation causes the pressure strain gauge to produce pressure. The pressure strain gauge will deform and produce resistance. The resistance is converted into an electrical signal through the signal conversion module, thereby generating an electrical signal. The small light bulb is lit through the signal indicator light. The general situation of the tunnel section can be judged by the brightness of the small light bulb. At the same time, the electrical signal is transmitted to the central computer processor for processing. The size of the current signal is converted into the corresponding spring deformation. The linear function of the electrical signal and the spring deformation is fitted by linear interpolation. Then, combined with the point cloud data obtained by the scanner, the accurate shape of the tunnel section can be obtained. Therefore, the detection device provided by the present invention can conveniently and quickly automate data processing and analysis, detect over-excavation and under-excavation conditions, and is simple to operate and easy to carry.

[0021] (2) The detection device of the present invention includes a telescopic rod, which is installed on a fixed annular steel frame and a movable annular steel belt. The size of the movable annular steel belt can be adjusted by adjusting the length of the telescopic rod, thereby adapting to different tunnel cross-section conditions, thereby improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A longitudinal section diagram of a tunnel over-break and under-break detection device provided by an embodiment of the present invention;

[0023] Figure 2 A cross-sectional view of a tunnel over-break and under-break detection device provided by an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the structure of the movable annular steel belt in the embodiment of the present invention;

[0025] Figure 4 is a structural schematic diagram of the wheel position in an embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the connection structure of the first fixing mechanism, the second fixing mechanism and the steel belt in an embodiment of the present invention;

[0027] Figure 6 A detection flow chart of a tunnel over-break and under-break detection device provided by an embodiment of the present invention;

[0028] Figure 7 is a circuit connection diagram of a central computer processor in an embodiment of the present invention;

[0029] In the figure: 1-fixed annular steel frame; 2-movable annular steel belt; 3-spring; 4-pressure strain gauge; 5-cylindrical steel column; 6-telescopic rod; 7-scanner; 8-central computer processor; 9-fixed rod; 10-tilt sensor; 11-wheel; 12-steel belt; 13-first fixing mechanism; 14-placement box; 15-second fixing mechanism; 16-connecting rod; 17-first spherical limit block; 18-second limit block; 19, slot; 20, bolt hole; 21-threaded rod; 22-second spherical limit block; 23-nut; 24-limiting groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] During the tunnel construction process, due to the cumulative influence of geology, blasting, etc., over-excavation and under-excavation are prone to occur. When there is over-excavation and under-excavation in the tunnel, there will be a difference between the actual excavation contour of the tunnel and the designed contour. The uneven contour of the actual excavation causes the stress exerted by the tunnel surrounding rock on the support structure to produce local stress concentration, making the initial support structure unstable. In actual engineering construction, over-excavation is inevitable, and over-excavation can be controlled within an acceptable range through construction technology control, equipment control, etc. However, under-excavation is generally not allowed. Strict control of over-excavation and under-excavation is of great significance to smooth construction, saving of equipment and human resources, and production safety. In order to prevent tunnel over-excavation and under-excavation, a tunnel over-excavation and under-excavation detection device and detection method are proposed.

[0033] like Figure 1-Figure 5 As shown, an embodiment of the present invention provides a tunnel over-excavation and under-excavation detection device, including a central computer processor 8 and a detection feedback body, wherein the central computer processor 8 is arranged inside the detection feedback body, and a plurality of telescopic rods are arranged between the detection feedback body and the central computer processor 8, wherein the telescopic end of each telescopic rod 6 is detachably connected to the detection feedback body, and an end of each telescopic rod 6 away from the telescopic end is connected to the outer side surface of the central computer processor 8.

[0034] The detection feedback body includes a fixed annular steel frame 1 and a movable annular steel belt 2, wherein the movable annular steel belt 2 is arranged on the outside of the fixed annular steel frame 1, and the telescopic end of the telescopic rod 6 is connected to the fixed annular steel frame 1. Four threaded holes of the same size are respectively opened on the fixed annular steel frame 1, and the telescopic rod 6 includes a threaded tube and a threaded rod, the bottom of the threaded rod is threadedly connected to the threaded tube, and the bottom of the threaded tube is connected to the outer side of the central computer processor, the top of the threaded rod passes through the threaded hole on the fixed annular steel frame 1, and the top of the threaded rod may be magnetic, and the inner side of the movable annular steel belt 2 has a magnetism opposite to that on the threaded rod, and the top of the threaded rod and the movable annular steel belt 2 are fixed by magnetic attraction, and the magnetism of the top of the threaded rod can be adjusted by the industrial computer.

[0035] The movable annular steel belt 2 includes two symmetrically arranged steel belts 12, the two steel belts are respectively rotatably arranged in the placement and storage boxes 14, the two placement and storage boxes 14 are arranged adjacent to each other, and the tops of the two placement and storage boxes 14 are connected to the bottom of the outer side of the fixed annular steel frame 1, and the two placement and storage boxes 14 are provided with through holes for the steel belts 12 to be retracted or pulled out. The specific connection structure of the placement and storage boxes 14 and the steel belt 12 is similar to the connection structure of the existing retractable and automatically retractable tape measure. The sliding ends of the two steel belts 12 are respectively provided with a first fixing mechanism 13 and a second fixing mechanism 15, the first fixing mechanism 13 includes a connecting rod 16 and a first spherical limit block 17, and one of the connecting rods 16 One end is connected to the movable end of one of the steel belts 12, and the other end is connected to the first spherical limit block 17. The second fixing mechanism 15 includes a second limit block 18. A slot 19 is provided on the side of the second limit block 18 adjacent to the first fixing mechanism 13. The first spherical limit block 17 can be plugged into the slot 19. A bolt hole 20 connected to the slot 19 is provided on the rear side of the second limit block 18. A threaded rod 21 is threadedly connected to the bolt hole 20. A second spherical limit block 22 matching the first spherical limit block 17 is provided at the bottom of the threaded rod 21. The second spherical limit block 22 can be clamped with the first spherical limit block 17, and the threaded rod 21 and the second limit block 18 are fixed by a nut 23.

[0036] The tunnel over-excavation and under-excavation detection device provided by the embodiment of the present invention controls the extension length of the threaded rod by rotating the threaded rod. When the threaded rod is extended or shortened, the movable annular steel belt 2 will be pulled out or retracted from the placement box 14, thereby changing the radius of the movable annular steel belt 2 to adapt to tunnels of different cross-sectional sizes. When the size of the movable annular steel belt 2 is adjusted, the first spherical stopper 17 on one of the steel belts 12 is inserted into the slot 19 on the second stopper 18 on the other steel belt 12, and then the threaded rod 19 is inserted into the bolt hole 20, and the second spherical stopper 22 at the bottom of the threaded rod 19 is clamped with the first spherical stopper 17, and then the threaded rod 21 and the second stopper 18 are fixed by the nut 23, so that the two steel belts 12 can be fixedly connected, thereby realizing the fixing of the movable annular steel belt 2. Before excavation, the movable annular steel belt 2 is adjusted to the tunnel design radius, and then the data received by the central processor 8 is reset to zero, so as to ensure that the data obtained by excavation is correct.

[0037] A plurality of induction detection mechanisms are evenly spaced along the circumferential direction between the fixed annular steel frame 1 and the movable annular steel belt 2. Each of the induction detection mechanisms comprises a limit groove 24, a spring 3, a pressure strain gauge 4 and a limit column 5. The limit groove 24 is provided on the outer side of the fixed annular steel frame 1, the pressure strain gauge 4 is provided at the bottom of the limit groove 24, one end of the spring 3 is connected to the pressure strain gauge 4, the other end of the spring 3 is connected to the limit column 5, and the movable end of the limit column 5 is in contact with the inner side of the movable annular steel belt 2. In the specific design, the entire spring 3 and part of the limit column 5 are always located inside the limit groove 24. When the size of the movable annular steel belt 2 is adjusted to the maximum state, the spring 3 is just in an uncompressed state. Such a design enables the limit column 5 to always be in contact with the steel belt 12 when the size of the movable annular steel belt 2 is adjusted, so that it can well receive the pressure of the tunnel section. Through the design of the limit column 5, it can be ensured that when the steel belt 12 is retracted or pulled out for size adjustment, the sensing detection mechanism will not produce horizontal displacement with the movement of the steel belt 12.

[0038] like Figure 7 As shown, the central computer processor 8 includes a signal conversion module, a signal indicator light, an industrial computer and a power module. The input end of the signal conversion module is connected to the pressure strain gauge 4 through a wire, and the output end of the signal conversion module is connected to the input end of the signal indicator light. The power module is electrically connected to the signal conversion module and the signal indicator light respectively. When the signal indicator light passes current, the small light bulb will light up. The over-excavation and under-excavation of the tunnel can be roughly judged according to the brightness of the small light bulb. The central computer processor 8 is provided with a power switch connected to the internal power module, and the power module supplies power to the signal conversion module and the signal indicator light.

[0039] After the tunnel excavation is completed, as the waterproof board hanging stand moves forward, the movable annular steel belt 2 on the detection device provided by the embodiment of the present invention contacts the tunnel section. The movable annular steel belt produces corresponding deformation according to the different excavation conditions of the tunnel section, so that the cylindrical steel column 5 produces vertical displacement, and the cylindrical steel column 5 squeezes the spring 3 to deform. The spring 3 is deformed to cause the pressure strain gauge 4 to generate pressure. The pressure strain gauge 4 will deform and generate resistance. The resistance is converted into an electrical signal through the signal conversion module, thereby generating an electrical signal. The small light bulb is lit through the signal indicator light, and the general situation of the tunnel section can be judged by the brightness of the small light bulb. At the same time, the electrical signal is transmitted to the central computer processor 8 for processing, and the size of the current signal is converted into the corresponding spring deformation. The linear function of the electrical signal and the deformation of the spring 3 is fitted by linear interpolation, and the linear function is fitted with the point cloud data obtained by the scanner 7 to know the exact shape of the tunnel section.

[0040] Wheels 11 are respectively arranged on the top and bottom of the outer side of the fixed annular steel frame 1, and a tilt sensor 10 is arranged on the wheel 11. When the wheel 11 moves forward, the tilt sensor 10 can obtain the posture of the platform at any time.

[0041] A scanner 7 is provided on the front side of the central computer processor 8, and the scanner 7 is electrically connected to the central computer processor 8 through a wire. A fixing rod 9 is provided on the rear side of the central computer processor 8, and the central computer processor 8 is connected to the tunnel waterproof board hanging stand through the fixing rod 9. The stand is an operating stand at the construction site. The detection device provided in the embodiment of the present invention is connected to the stand and can be processed immediately after the over-excavation result is detected, thereby improving efficiency. The model of the scanner 7 is a RIEGLVZ-1000 ground laser scanner. The scanner 7 can draw the general outline of the tunnel section through the laser point cloud, and transmit the data to the central computer processor 8 for processing. The central computer processor 8 will generate a 3D general outline of the tunnel from the point cloud data obtained by the scanner 7. As the stand moves forward, the central computer processor 8 will process the data obtained by the pressure strain gauge 4 and fit it with the point cloud data to obtain a more accurate tunnel section shape.

[0042] like Figure 6 As shown, the embodiment of the present invention also provides a detection method of the above tunnel over-break and under-break detection device, which specifically includes the following steps:

[0043] S1, moving the tunnel overbreak and underbreak detection device to the tunnel section to be measured, and in the process of the tunnel overbreak and underbreak detection device moving forward, using the laser point cloud to generate point cloud data of the tunnel section contour through the scanner 6;

[0044] S2. During the forward movement of the tunnel over-break and under-break detection device, the specific data of the tunnel over-break and under-break are measured by the detection feedback body, and the over-break and under-break positions of the tunnel are marked one by one and numbered. The specific steps of measuring the specific data of the tunnel over-break and under-break by the detection feedback body are as follows:

[0045] During the forward movement of the tunnel over-excavation and under-excavation detection device, the movable annular steel belt 2 contacts the tunnel section, and the movable annular steel belt 2 produces corresponding deformation, thereby causing the cylindrical steel column 5 to produce vertical displacement. The cylindrical steel column 5 squeezes the spring 3 to deform, and the spring 3 is deformed to cause the pressure strain gauge 4 to generate pressure. The pressure strain gauge 4 will deform and generate resistance, which will be converted into an electrical signal through a signal conversion module, thereby generating an electrical signal. The signal indicator light makes a small light bulb light up, and the condition of the tunnel section can be judged by the brightness of the small light bulb. At the same time, the electrical signal is transmitted to the central computer processor 8 for processing, and the size of the current signal is converted into the corresponding spring deformation to obtain specific data of the tunnel over-excavation and under-excavation.

[0046] S3, transmitting the point cloud data obtained in step S1 and the data obtained by the detection feedback body obtained in step S2 to the central computer processor 7 through wires, and converting the incoming electrical signals into specific data to obtain point cloud pre-processing data and tunnel over-excavation and under-excavation pre-processing data;

[0047] S4. In the central computer processor 8, the point cloud preprocessing data obtained in step S3 and the tunnel over-break and under-break preprocessing data are fitted, and Andrew's monotone chain convex hull algorithm is used to extract the tunnel section contour line. The tunnel section contour line is extracted and then compared with the tunnel design value, the over-break and under-break status of the current data is calculated, and then it is determined whether corresponding measures need to be taken.

[0048] In summary, the tunnel over-excavation and under-excavation detection method provided by the embodiment of the present invention solves the detection problem of traditional tunnel over-excavation and under-excavation, and can replace the traditional manual measurement of tunnel over-excavation and under-excavation. The detection device provided by the embodiment of the present invention has a simple structure, low cost, simple operation, and is easy to master. It can accurately detect the over-excavation and under-excavation of the tunnel, avoid the time-consuming and labor-intensive traditional measurement device, and the problem of bulky equipment required for measurement. While reducing construction costs, it guarantees the construction period; the structural design is reasonable, the concept is ingenious and novel, breaking the traditional method, greatly enriching the tunnel construction detection equipment, and has extremely wide promotion value.

[0049] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A tunnel over-break and under-break detection device, characterized in that: It comprises a central computer processor (8) and a detection feedback body, wherein the central computer processor (8) is arranged inside the detection feedback body, and a plurality of telescopic rods are arranged between the detection feedback body and the central computer processor (8), wherein the telescopic end of each telescopic rod (6) is detachably connected to the detection feedback body, and the end of each telescopic rod (6) away from the telescopic end is connected to the outer side surface of the central computer processor (8); The detection feedback body comprises a fixed annular steel frame (1) and a movable annular steel belt (2), wherein the movable annular steel belt (2) is arranged outside the fixed annular steel frame (1), and the telescopic ends of the telescopic rod (6) are respectively connected to the fixed annular steel frame (1) and the movable annular steel belt (2); A plurality of induction detection mechanisms are evenly spaced along the circumferential direction between the fixed annular steel frame (1) and the movable annular steel belt (2); Each of the inductive detection mechanisms comprises a limit groove (24), a spring (3), a pressure strain gauge (4) and a limit column (5); the limit groove (24) is opened on the outer side surface of the fixed annular steel frame (1); the pressure strain gauge (4) is arranged at the bottom of the limit groove (24); one end of the spring (3) is connected to the pressure strain gauge (4); the other end of the spring (3) is connected to the limit column (5); and the movable end of the limit column (5) is in contact with the inner side surface of the movable annular steel belt (2).

2. The tunnel over-break and under-break detection device according to claim 1, characterized in that: The central computer processor (8) comprises a signal conversion module, a signal indicator light, an industrial computer and a power module. The input end of the signal conversion module is connected to the pressure strain gauge (4) via a wire, the output end of the signal conversion module is connected to the input end of the signal indicator light, the output end of the signal indicator light is connected to the industrial computer, the industrial computer performs registration, denoising, coordinate system normalization, compression and three-dimensional reconstruction processing on the input electrical signal to simulate the over-excavation and under-excavation conditions of the tunnel. The power module is electrically connected to the signal conversion module, the signal indicator light and the industrial computer respectively.

3. The tunnel over-break and under-break detection device according to claim 1, characterized in that: Wheels (11) are respectively arranged at the top and bottom of the outer side surface of the fixed annular steel frame (1), and tilt sensors (10) are arranged on the wheels (11).

4. The tunnel over-break and under-break detection device according to claim 1, characterized in that: A scanner (7) is arranged on the front side of the central computer processor (8), and the scanner (7) is electrically connected to the central computer processor (8) via a wire. A fixing rod (9) is arranged on the rear side of the central computer processor (8).

5. A detection method according to the tunnel over-break and under-break detection device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, moving the tunnel overbreak and underbreak detection device to the tunnel section to be measured, and in the process of the tunnel overbreak and underbreak detection device moving forward, using a scanner (7) to generate point cloud data of the tunnel section contour using a laser point cloud; S2. During the process of the tunnel over-break and under-break detection device moving forward, the specific data of the tunnel over-break and under-break are measured by detecting the feedback body, and the over-break and under-break positions of the tunnel are marked one by one and numbered; S3, transmitting the point cloud data obtained in step S1 and the data obtained by the detection feedback body obtained in step S2 to the central computer processor (8) through wires, and converting the transmitted electrical signals into specific data to obtain point cloud pre-processing data and tunnel over-excavation and under-excavation pre-processing data; S4. In the central computer processor (8), the point cloud pre-processed data obtained in step S3 and the tunnel over-break and under-break pre-processed data are fitted to extract the tunnel section contour line, which is then compared with the tunnel design value to calculate the over-break and under-break status of the current data, and then determine whether corresponding measures need to be taken.

6. The detection method of the tunnel over-break and under-break detection device according to claim 5, characterized in that: In step S2, the specific steps for the detection feedback body to measure the specific data of tunnel over-break and under-break are as follows: during the forward movement of the tunnel over-break and under-break detection device, the movable annular steel belt (2) contacts the tunnel section, the movable annular steel belt (2) generates corresponding deformation, thereby driving the limit column (5) to move, and compressing the spring (3) to deform so that the pressure strain gauge (4) generates pressure, the pressure strain gauge (4) will deform to generate resistance, and the resistance will be converted into an electrical signal through the signal conversion module, thereby generating an electrical signal, and the small light bulb will light up through the signal indicator light, and the condition of the tunnel section can be judged by the brightness of the small light bulb, and at the same time, the electrical signal is transmitted to the central computer processor (8) for processing, and the size of the current signal is converted into the corresponding spring deformation to obtain the specific data of tunnel over-break and under-break.

Images