Highway tunnel crack depth measuring equipment

Abstract

The invention relates to the technical field of highway tunnel crack measurement, and discloses highway tunnel crack depth measuring equipment which comprises a laser range finder used for measuring the depth of a crack, and the bottom of the laser range finder is provided with a laser emission port; the laser range finder further comprises installation plates fixed to the two sides of the laser range finder, an air curtain isolation mechanism is arranged on the outer side of the laser emission port and used for preventing dust, sand and stone particles from entering the light beam channel, and an airflow supply mechanism is installed on one side of one installation plate. According to the highway tunnel crack depth measuring device, existing highway tunnel crack depth measuring equipment is improved, the designed air curtain isolation mechanism and the airflow supply mechanism are matched with each other, and the airflow supply mechanism can introduce dry nitrogen into the air curtain isolation mechanism, so that clean airflow is continuously blown out below a laser emission port, and an air curtain is formed to isolate a measuring path; and dust or gravel particles are prevented from entering a light beam channel.

Description

Technical Field

[0001] The present invention relates to the technical field of crack measurement for highway tunnels, and particularly to a device for measuring the depth of cracks in highway tunnels. Background Technique

[0002] During the long-term use of the highway tunnel surface, cracks will appear. In order to better analyze the structural stability of the highway tunnel, a laser rangefinder is needed to measure the depth of the cracks. This device can accurately and quickly measure the depth of the cracks through the built-in laser ranging module. The laser beam emitted by the laser rangefinder can directly irradiate the bottom of the crack, and by measuring the reflection time or phase difference of the laser beam, the depth of the crack can be accurately calculated.

[0003] In view of the fact that the current measurement of the depth of cracks in highway tunnels using a laser rangefinder is carried out in an outdoor environment, there are vehicles driving on the highway tunnel during the measurement process, resulting in dust or sand and gravel flying around the measurement position. Dust, sand and gravel particles will scatter and absorb the laser beam, making the reflected light signal received by the receiver of the laser rangefinder weaker and containing clutter, interfering with the distance calculation. Moreover, there are often inevitable impurities such as sand and gravel in the crack, which may also cause occlusion of the measurement path, resulting in a large error in the detection of the crack depth or even obtaining a wrong result. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for measuring the depth of cracks in highway tunnels to solve the problem of inaccurate measurement results of the laser rangefinder proposed in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A device for measuring the depth of cracks in highway tunnels, including a laser rangefinder for measuring the depth of the gap, and the bottom of the laser rangefinder has a laser emission port; further including: mounting plates fixed on both sides of the laser rangefinder, an air curtain isolation mechanism is provided outside the laser emission port, and the air curtain isolation mechanism is used to block dust, sand and gravel particles from entering the beam channel, and an air flow supply mechanism is installed on one side of one of the mounting plates; a connection mechanism installed at the outer end of one side of the bottom of the mounting plate, and the mounting plate is rotationally connected with an inner support mechanism through the connection mechanism.

[0006] Preferably, the air curtain isolation mechanism includes an annular pipe, a first blowing branch pipe, a first gas inlet pipe and a micro air pump. The annular pipe is fixedly sleeved outside the laser emission port, and a plurality of first blowing branch pipes are evenly provided. One end of each of the plurality of first blowing branch pipes is communicated with the inside of the annular pipe, and one end of the first gas inlet pipe is also communicated with the inside of the annular pipe. A cleaning member is further provided between the annular pipe and the laser rangefinder. The micro air pump is fixedly installed inside the mounting plate, and the other end of the first gas inlet pipe is fixedly connected to the output end of the micro air pump.

[0007] Preferably, the air flow supply mechanism includes a nitrogen cylinder, a manual valve and a connecting pipe. The manual valve is installed at the position of the air outlet at the bottom end of the nitrogen cylinder. The air outlet of the nitrogen cylinder is communicated with the air inlet end of the micro air pump through the connecting pipe. Two positioning members are fixed on the outer side of the nitrogen cylinder.

[0008] Preferably, the inner support mechanism includes a fixing plate, a support plate, a connecting plate and an extrusion member. There are two support plates symmetrically arranged. The tops of the two support plates are both connected to the extrusion member through the connecting plate. The extrusion member is installed on the fixing plate.

[0009] Preferably, the extrusion member includes a sliding plate, an operation block, an extrusion spring and a limiting post. A sliding groove is formed on the fixing plate. The sliding plate is slidably connected in the sliding groove. The bottom end of the sliding plate is fixed to the support plate through the connecting plate. The two ends of the limiting post are respectively fixed to the inner side of the sliding groove. The sliding plate is slidably sleeved on the outer side of the limiting post. The operation block is fixed on the top of the sliding plate. The two ends of the extrusion spring are respectively fixed to the two sliding plates, and the limiting post is sleeved inside the extrusion spring.

[0010] Preferably, there is a gap between the two support plates, and anti-slip patterns are provided on the sides of the two support plates away from each other.

[0011] Preferably, a transparent cover is fixed at the end of the laser emission port, and a coupling liquid is filled in the transparent cover.

[0012] Preferably, the connecting mechanism includes a U-shaped block and a connecting seat. One end of the connecting seat is fixedly connected to the mounting plate. One end of the U-shaped block is fixedly connected to the fixing plate. A groove is formed on one side of the connecting seat. The U-shaped block is rotatably connected in the groove through a fixing pin shaft.

[0013] Preferably, the positioning member includes a fixed collar and a positioning bolt. The fixed collar is fixed on the outer wall of the mounting plate. The nitrogen cylinder is sleeved inside the fixed collar. The positioning bolt is threadedly connected to one end of the fixed collar, and the end of it extending into the inner side of the fixed collar is in contact with the outer wall of the nitrogen cylinder.

[0014] Preferably, the cleaning member includes a second gas inlet pipe, second blowing branch pipes and cleaning spray pipes. One end of the second gas inlet pipe is fixedly connected to the annular pipe. The other end of the second gas inlet pipe is fixedly connected to the second blowing branch pipes. A plurality of cleaning spray pipes are evenly distributed on the upper side of the second gas inlet pipe. The cleaning spray pipes are arranged obliquely upward and face the outer surface of the data display screen on the laser rangefinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. By improving the existing device for measuring the depth of cracks in highway tunnels, through the mutual cooperation of the designed air curtain isolation mechanism and the air flow supply mechanism, the air flow supply mechanism can introduce dry nitrogen into the air curtain isolation mechanism, so that a clean air flow continuously blows below the laser emission port, forming an air curtain to isolate the measurement path. This can not only prevent dust or sand particles from entering the light beam channel, but also clean impurities such as sand in the measurement path, thus avoiding occlusion of the measurement path.

[0017] 2. The designed inner support mechanism and connection mechanism in the present invention enable the laser rangefinder to be fixed to cracks of different widths, avoiding shaking of the laser rangefinder during measurement, thereby affecting the stability of the device and the accuracy of measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a front view of the present invention;

[0020] Figure 3 is a schematic diagram of the structure of the air curtain isolation mechanism and the air flow supply mechanism of the present invention;

[0021] Figure 4 is a schematic diagram of the structure of the inner support mechanism and the connection mechanism of the present invention;

[0022] Figure 5 is a schematic diagram of the structure of the positioning member of the present invention;

[0023] Figure 6 is a schematic diagram of the structure of the cleaning member of the present invention;

[0024] Figure 7 is a schematic diagram of the internal sectional structure of the laser emission port of the present invention.

[0025] In the figure: 1. Laser rangefinder; 2. Laser emission port; 3. Mounting plate; 4. Air curtain isolation mechanism; 5. Air flow supply mechanism; 6. Connection mechanism; 7. Inner support mechanism; 8. Annular tube; 9. First blowing branch pipe; 10. First gas inlet pipe; 11. Micro air pump; 12. Cleaning member; 13. Nitrogen cylinder; 14. Manual valve; 15. Connecting pipe; 16. Positioning member; 17. Fixed plate; 18. Support plate; 19. Connecting plate; 20. Extrusion member; 21. Sliding plate; 22. Operating block; 23. Extrusion spring; 24. Limit post; 25. Chute; 26. Transparent cover; 27. Coupling liquid; 28. U-shaped block; 29. Connection seat; 30. Fixed collar; 31. Positioning bolt; 32. Second gas inlet pipe; 33. Second blowing branch pipe; 34. Cleaning spray pipe. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1: Please refer to Figures 1 - 3 , a device for measuring the crack depth of a highway tunnel in the figure, including a laser rangefinder 1 for measuring the crack depth, and the bottom of the laser rangefinder 1 has a laser emission port 2; further including: mounting plates 3 fixed on both sides of the laser rangefinder 1, an air curtain isolation mechanism 4 is arranged outside the laser emission port 2, and the air curtain isolation mechanism 4 is used to block dust, sand and gravel particles from entering the light beam channel, and an air flow supply mechanism 5 is installed on one side of one of the mounting plates 3; a connecting mechanism 6 installed on the outer end of the bottom side of the mounting plate 3, and the mounting plate 3 is rotatably connected with an inner support mechanism 7 through the connecting mechanism 6.

[0028] In this solution, through the mutual cooperation of the designed air curtain isolation mechanism 4 and the air flow supply mechanism 5, the air flow supply mechanism 5 can introduce dry nitrogen into the air curtain isolation mechanism 4, so that a clean air flow continuously blows below the laser emission port 2, separating the outside air containing dust or sand and gravel particles from the laser beam channel, preventing particles from entering the beam channel, thereby avoiding the influence of particles on the laser such as scattering and absorption, ensuring the accuracy of laser ranging, and also being able to clean impurities such as sand and gravel in the measurement path, thereby avoiding blockage in the measurement path.

[0029] Furthermore, refer to Figure 3 , the air curtain isolation mechanism 4 includes an annular tube 8, a first blowing branch tube 9, a first gas inlet tube 10 and a micro air pump 11. The annular tube 8 is fixedly sleeved outside the laser emission port 2. A plurality of the first blowing branch tubes 9 are evenly arranged, and one ends of the plurality of first blowing branch tubes 9 are all communicated with the inside of the annular tube 8. One end of the first gas inlet tube 10 is also communicated with the inside of the annular tube 8. A cleaning member 12 is further arranged between the annular tube 8 and the laser rangefinder 1. The micro air pump 11 is fixedly installed on the inner side of the mounting plate 3, and the other end of the first gas inlet tube 10 is fixedly connected to the output end of the micro air pump 11.

[0030] In addition, refer to Figure 3, the air flow supply mechanism 5 includes a nitrogen cylinder 13, a manual valve 14 and a connecting pipe 15. The manual valve 14 is installed at the outlet of the bottom end of the nitrogen cylinder 13. The outlet of the nitrogen cylinder 13 is connected to the inlet end of the micro air pump 11 through the connecting pipe 15. Two groups of positioning members 16 are fixed on the outer side of the nitrogen cylinder 13.

[0031] The principle of laser path isolation for the laser rangefinder 1: When in use, the operator opens the manual valve 14, then starts the micro air pump 11 to work, and introduces the dry nitrogen in the nitrogen cylinder 13 into the annular pipe 8 and blows it out from multiple first blowing branch pipes 9. That is, the dry nitrogen is ejected in the form of a high-pressure air flow through the micro air pump 11. The high-pressure air flow forms a continuous air curtain in front of the laser emission port 2, separating the outside air containing dust or sand particles from the laser beam channel, so that the particles cannot enter the beam channel, thereby avoiding the influence of particle scattering and absorption on the laser, and ensuring the accuracy of laser ranging; in addition, the formed high-pressure air curtain blows towards the surface of the gap, thereby indirectly cleaning the accumulated water and loose sand on the surface of the gap, so as to expose the true interface of the crack.

[0032] It should be noted that: The dry nitrogen used in the nitrogen cylinder 13 of this solution has the characteristics of being dry, oil-free and low in pollutant content. Nitrogen is an inert gas, which can make the laser work in an oxygen-free environment, without the risk of oxidation, and can also prevent damage to the laser equipment caused by the condensation of water vapor in humid air.

[0033] Further, refer to Figure 5 , the positioning member 16 includes a fixed collar 30 and a positioning bolt 31. The fixed collar 30 is fixed on the outer wall of the mounting plate 3. The nitrogen cylinder 13 is sleeved inside the fixed collar 30. The positioning bolt 31 is threadedly connected to one end of the fixed collar 30, and the end thereof extending into the inside of the fixed collar 30 is in contact with the outer wall of the nitrogen cylinder 13.

[0034] Specifically, by sleeving the nitrogen cylinder 13 inside the fixed collar 30 and then rotating the positioning bolt 31, one end of the positioning bolt 31 is brought into contact with the surface of the nitrogen cylinder 13, thereby realizing the fixation of the nitrogen cylinder 13, which makes it more convenient and fast to replace the nitrogen cylinder 13.

[0035] Further, please refer to Figure 6, the cleaning member 12 includes a second gas inlet pipe 32, second blowing branch pipes 33, and cleaning spray nozzles 34. One end of the second gas inlet pipe 32 is fixedly connected to the annular pipe 8, and the other end of the second gas inlet pipe 32 is fixedly connected to the second blowing branch pipes 33. A plurality of cleaning spray nozzles 34 are evenly distributed on the upper side of the second gas inlet pipe 32. The cleaning spray nozzles 34 are arranged obliquely upward and face the outer surface of the data display screen on the laser rangefinder 1.

[0036] Specifically, during the measurement process, the introduced dry nitrogen gas also enters the second blowing branch pipes 33 from the second gas inlet pipe 32 and is ejected from the plurality of cleaning spray nozzles 34. At this time, a small amount of dry nitrogen gas has a cleaning effect, and can synchronously clean the surface dust and particles of the data display screen on the laser rangefinder 1, ensuring the clarity of the depth size display result.

[0037] Embodiment 2: Please refer to Figure 2 and Figure 4 , this embodiment further describes Embodiment 1, and the difference lies in optimizing the installation and disassembly steps of the laser rangefinder 1.

[0038] Specifically, the inner support mechanism 7 includes a fixing plate 17, support plates 18, a connecting plate 19, and an extrusion member 20. There are two symmetrically arranged support plates 18. The tops of the two support plates 18 are both connected to the extrusion member 20 through the connecting plate 19, and the extrusion member 20 is installed on the fixing plate 17; the extrusion member 20 includes a sliding plate 21, an operation block 22, an extrusion spring 23, and a limit post 24. A chute 25 is formed on the fixing plate 17, and the sliding plate 21 is slidably connected in the chute 25. The bottom end of the sliding plate 21 is fixedly connected to the support plate 18 through the connecting plate 19. The two ends of the limit post 24 are respectively fixed to the inner side of the chute 25. The sliding plate 21 is slidably sleeved on the outer side of the limit post 24. The operation block 22 is fixed to the top of the sliding plate 21. The two ends of the extrusion spring 23 are respectively fixedly connected to the two sliding plates 21, and the limit post 24 is sleeved inside the extrusion spring 23.

[0039] The principle of positioning the laser rangefinder 1 is as follows: before measurement, the two operating blocks 22 are pressed by fingers, and the two operating blocks 22 drive the extrusion springs 23 to compress, and drive the sliding plate 21 to slide in the slide groove 25, thereby driving the two support plates 18 to move closer to each other, and then the two support plates 18 are inserted into the corresponding gaps, and the operating blocks 22 are released. Under the elastic restoring force of the extrusion springs 23, the two support plates 18 are driven to move away from each other, so that the outer sides of the support plates 18 are attached to the inner walls of the gaps, thereby installing the laser rangefinder 1 on the gap, so as to better perform measurements and avoid shaking of the laser rangefinder 1 during measurement, thereby affecting the stability of the equipment and the accuracy of the measurement.

[0040] At the same time, there is a gap between the two support plates 18, and the sides of the two support plates 18 that are away from each other are both provided with anti-slip grooves, thereby increasing the friction between the support plates 18 and the inner wall of the gap.

[0041] At the same time, the connecting mechanism 6 includes a U-shaped block 28 and a connecting seat 29, one end of the connecting seat 29 is fixedly connected to the mounting plate 3, one end of the U-shaped block 28 is fixedly connected to the fixed plate 17, and a groove is provided on one side of the connecting seat 29, and the U-shaped block 28 is rotatably connected in the groove through a fixed pin shaft.

[0042] Specifically, when the gap is not in a horizontal state when viewed from a top-down perspective, the fixing plate 17 can be rotated by the U-shaped block 28 and the connecting seat 29 to adjust the angle between the support plate 18 and the laser rangefinder 1 so that it can be smoothly inserted into the corresponding gap for positioning, thereby adapting to the positioning of gaps of different shapes.

[0043] Example 3: Please refer to Figure 1 and Figure 7 This embodiment further explains other embodiments, and the difference lies in the optimization of the transmitting end of the laser rangefinder 1.

[0044] Specifically, a highway tunnel crack depth measurement device includes a laser rangefinder 1 for measuring crack depth. The bottom of the laser rangefinder 1 has a laser emission port 2, and a transparent cover 26 is fixed to the end of the laser emission port 2. The transparent cover 26 is filled with a coupling liquid 27. By adding a transparent waterproof cover to the laser emission end and filling it with coupling liquid 27 with a refractive index close to that of water (such as glycerin), the refractive loss of laser light when it enters water from air is reduced, the penetration ability is improved, and the influence of water accumulation in the crack on the measurement result is avoided.

[0045] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0046] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the crack depth of a highway tunnel, comprising: A laser rangefinder (1) for measuring the crack depth, and the bottom of the laser rangefinder (1) has a laser emission port (2); It is characterized in that it further comprises: Mounting plates (3) fixed on both sides of the laser rangefinder (1), an air curtain isolation mechanism (4) is arranged outside the laser emission port (2), and the air curtain isolation mechanism (4) is used to block dust, sand and gravel particles from entering the light beam channel, and an air flow supply mechanism (5) is installed on one side of one of the mounting plates (3); A connecting mechanism (6) installed at the outer end of one side of the bottom of the mounting plate (3), and the mounting plate (3) is rotatably connected to an inner support mechanism (7) through the connecting mechanism (6).

2. The depth measurement device for cracks in a highway tunnel according to claim 1, characterized in that: The air curtain isolation mechanism (4) comprises an annular pipe (8), a first blowing branch pipe (9), a first gas inlet pipe (10) and a micro air pump (11), the annular pipe (8) is fixedly sleeved outside the laser emission port (2), a plurality of the first blowing branch pipes (9) are evenly arranged, one ends of the plurality of the first blowing branch pipes (9) are all communicated with the inside of the annular pipe (8), one end of the first gas inlet pipe (10) is also communicated with the inside of the annular pipe (8), a cleaning member (12) is further arranged between the annular pipe (8) and the laser rangefinder (1), the micro air pump (11) is fixedly installed on the inner side of the mounting plate (3), and the other end of the first gas inlet pipe (10) is fixedly connected to the output end of the micro air pump (11).

3. The depth measurement device for highway tunnel cracks according to claim 2, characterized in that: The air flow supply mechanism (5) comprises a nitrogen cylinder (13), a manual valve (14) and a connecting pipe (15), the manual valve (14) is installed at the position of the bottom air outlet of the nitrogen cylinder (13), the air outlet of the nitrogen cylinder (13) and the air inlet end of the micro air pump (11) are communicated through the connecting pipe (15), and two groups of positioning members (16) are fixed on the outer side of the nitrogen cylinder (13).

4. The depth measurement device for highway tunnel cracks according to claim 1, characterized in that: The inner support mechanism (7) comprises a fixing plate (17), a support plate (18), a connecting plate (19) and an extrusion member (20), two support plates (18) are symmetrically arranged, the tops of the two support plates (18) are both connected to the extrusion member (20) through the connecting plate (19), and the extrusion member (20) is installed on the fixing plate (17).

5. The highway tunnel crack depth measuring device according to claim 4, wherein: The extrusion member (20) includes a sliding plate (21), an operating block (22), an extrusion spring (23), and a limiting post (24). A chute (25) is formed in the fixed plate (17). The sliding plate (21) is slidably connected in the chute (25). The bottom end of the sliding plate (21) is fixed to the support plate (18) through the connecting plate (19). Both ends of the limiting post (24) are respectively fixed to the inner side of the chute (25). The sliding plate (21) is slidably sleeved on the outer side of the limiting post (24). The operating block (22) is fixed to the top of the sliding plate (21). Both ends of the extrusion spring (23) are respectively fixedly connected to the two sliding plates (21), and the limiting post (24) is sleeved inside the extrusion spring (23).

6. The depth measurement device for cracks in a highway tunnel according to claim 4, characterized in that: There is a gap between the two support plates (18), and anti-slip patterns are provided on the sides of the two support plates (18) facing away from each other.

7. The depth measuring device for cracks in a highway tunnel according to claim 1, characterized in that: A transparent cover (26) is fixed to the end of the laser emission port (2), and a coupling liquid (27) is filled in the transparent cover (26).

8. The depth measurement device for highway tunnel cracks according to claim 4, characterized in that: The connecting mechanism (6) includes a U-shaped block (28) and a connecting seat (29). One end of the connecting seat (29) is fixedly connected to the mounting plate (3). One end of the U-shaped block (28) is fixedly connected to the fixed plate (17). A groove is formed on one side of the connecting seat (29). The U-shaped block (28) is rotatably connected in the groove through a fixed pin shaft.

9. The depth measuring device for cracks in a highway tunnel according to claim 3, characterized in that: The positioning member (16) includes a fixed collar (30) and a positioning bolt (31). The fixed collar (30) is fixed to the outer wall of the mounting plate (3). The nitrogen cylinder (13) is sleeved inside the fixed collar (30). The positioning bolt (31) is threadedly connected to one end of the fixed collar (30), and the end of it extending into the inside of the fixed collar (30) is in contact with the outer wall of the nitrogen cylinder (13).

10. The highway tunnel crack depth measuring device according to claim 2, characterized in that: The cleaning member (12) includes a second gas inlet pipe (32), second blowing branch pipes (33), and cleaning spray pipes (34). One end of the second gas inlet pipe (32) is fixedly connected to the annular pipe (8). The other end of the second gas inlet pipe (32) is fixedly connected to the second blowing branch pipes (33). A plurality of cleaning spray pipes (34) are evenly distributed on the upper side of the second gas inlet pipe (32). The cleaning spray pipes (34) are arranged obliquely upward and face the outer surface of the data display screen on the laser rangefinder (1).

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