Measuring device for TBM tunnel construction monitoring points

Abstract

The invention discloses a TBM tunnel construction monitoring point measuring device which comprises a tunnel pipeline, and a total station is arranged at the inner bottom of the tunnel pipeline. The positioning assembly is matched with the total station, the positioning assembly comprises a vertical plate, the left side of the vertical plate is rotationally connected with a rotating shaft, the left end of the rotating shaft is fixedly connected with a reflective indicating plate, and a cross marking line is arranged on the reflective indicating plate; and the cleaning mechanism is used for cleaning the reflective indicating plate, the cleaning mechanism comprises a rotating shaft rotationally connected to the left side of the vertical plate, the left end of the rotating shaft is fixedly connected with a rotating cylinder, and a third piston plate capable of sliding up and down is arranged in the rotating cylinder. In the actual using process of the device, the cleaning mechanism can be started to operate before monitoring is conducted every time, the cleaning mechanism is used in cooperation with a rubber scraping plate through a water body, dust scattering and overflowing prevention type self-cleaning can be achieved, and the monitoring accuracy is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of tunnel settlement monitoring, and particularly to a measuring device for monitoring points in TBM tunnel construction. Background Art

[0002] During the construction process of a tunnel boring machine (TBM), ensuring the stability of the tunnel segment structure is a key factor in maintaining construction safety. Traditionally, this monitoring task mainly relies on a total station to regularly measure the spatial coordinates of reflectors carefully arranged on the segment surface. Although this method can theoretically provide relatively accurate monitoring data, it faces a series of challenges in actual operation; A significant problem is that there are inevitably a large number of moving dust particles in the tunnel. These dust particles are extremely likely to adhere to the reflectors, thereby having an adverse impact on the light reflection ability of the reflectors. As a key component in the measurement process, the cleanliness of the reflector surface is directly related to the accuracy and reliability of the measurement data. Once the reflector is contaminated by dust, it will lead to a decrease in measurement accuracy and may even mislead construction decisions, thus threatening the safety of the entire tunnel project; Even more troublesome is that the reflectors are usually installed at relatively high positions to facilitate unobstructed measurement by the total station. This means that once the reflectors need to be cleaned, the staff often need to climb to a relatively high position to operate. Such high-altitude operations not only have extremely high labor intensity but also pose significant safety hazards. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies existing in the prior art, and a measuring device for monitoring points in TBM tunnel construction is proposed. During the actual use process of this device, before each monitoring, the cleaning mechanism can be started to operate. The cleaning mechanism uses water in cooperation with a rubber squeegee to achieve dust-proof overflow self-cleaning, ensuring the accuracy of monitoring.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions: A measuring device for a monitoring point of a TBM tunnel construction comprises a tunnel pipeline, wherein a total station is arranged at the inner bottom of the tunnel pipeline; a positioning assembly, wherein the positioning assembly cooperates with the total station, wherein the positioning assembly comprises a vertical plate, wherein a rotating shaft is rotatably connected to the left side of the vertical plate, wherein a reflective indicator plate is fixedly connected to the left end of the rotating shaft, wherein a cross mark line is arranged on the reflective indicator plate; a cleaning mechanism, wherein the cleaning mechanism is used to clean the reflective indicator plate, wherein the cleaning mechanism comprises a rotating shaft rotatably connected to the left side of the vertical plate, wherein a rotating cylinder is fixedly connected to the left end of the rotating shaft, wherein a third piston plate which can slide up and down is arranged in the rotating cylinder, wherein a folded connecting rod is fixedly connected to the upper end of the third piston plate, wherein the lower end of the third piston plate is elastically connected to the inner bottom of the rotating cylinder through a second spring, wherein one vertical portion of the folded connecting rod passes through the inner top of the rotating cylinder, wherein a hollow bar is fixedly connected to the other end of the folded connecting rod, wherein a rubber scraper is arranged on the right side of the hollow bar; and a fluid supply mechanism, wherein the fluid supply mechanism is used to supply fluid, and the cleaning effect is improved while the cleaning mechanism is operated.

[0005] Preferably, a mounting plate is fixedly connected to the top of the vertical plate, and a plurality of mounting holes are formed on the mounting plate.

[0006] Preferably, the folded connecting rod is a rod body provided with a through groove, one end of which passes through the third piston plate, and the other end extends to the inside of the hollow bar.

[0007] Preferably, a drive motor is installed on the right side of the vertical plate, a gearbox is installed on the right side of the vertical plate, an input shaft of the gearbox passes through the vertical plate and is fixedly connected to the right end of the rotating shaft, and the input shaft of the gearbox and the output shaft of the drive motor are connected through a transmission member.

[0008] Preferably, the transmission member comprises two pulleys, the two pulleys are respectively mounted on the output shaft of the driving motor and the input shaft of the gearbox, and the two pulleys are connected via a transmission belt.

[0009] Preferably, the fluid supply mechanism includes a first piston cylinder installed on the right side of the vertical plate, the right side of the vertical plate is fixedly connected to a water tank, the inner top space of the first piston cylinder is connected to the water tank through a first one-way tube, the inner top space of the first piston cylinder is connected to the outside through a one-way port, a connecting cylinder is installed at the upper end of the water tank, the inner top of the connecting cylinder is connected to the outside through a connecting hole, a second piston plate that can slide up and down is provided in the connecting cylinder, the upper end of the second piston plate is connected to the inner top space of the connecting cylinder through a first spring, the inner top space of the first piston cylinder is connected to the inner bottom space of the connecting cylinder through a second one-way tube, the inner bottom space of the connecting cylinder is connected to the inner bottom space of the rotating cylinder through a gas-liquid discharge pipe, and the gas-liquid discharge pipe is a soft pipe.

[0010] Preferably, a normally closed solenoid valve is installed inside the gas-liquid discharge pipe. An installation post is installed at the inner top of the connecting cylinder. A touch delay switch is installed at the lower end of the installation post. The touch delay switch is electrically connected to the normally closed solenoid valve.

[0011] Preferably, check valves are installed inside the first one-way pipe, the second one-way pipe, and the one-way port. The flow direction of the check valve inside the first one-way pipe is from the water tank unidirectionally into the inner top space of the first piston cylinder for connection and communication. The flow direction of the check valve inside the second one-way pipe is from the first piston cylinder unidirectionally into the inner bottom space of the connecting cylinder. The flow direction of the check valve inside the one-way port is from the outside unidirectionally into the first piston cylinder.

[0012] Preferably, a plurality of gas-liquid discharge holes are formed on the right side wall of the hollow strip. A plurality of second piston cylinders are fixedly connected to the right side of the hollow strip. The left side spaces of the plurality of second piston cylinders are all communicated with the inside of the hollow strip through communication ports. A slidable piston column is arranged in each second piston cylinder. The left side of each piston column is elastically connected to the left inner wall of the second piston cylinder through a third spring. The right ends of the plurality of piston columns are commonly fixedly connected to a rubber squeegee.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By installing the positioning component at the inner top position of the tunnel pipeline and regularly monitoring the coordinate changes of the reflective indicator board by using a total station, the effective monitoring of the tunnel pipeline is realized. This installation method reduces the possibility of being blocked, improves the accuracy and reliability of monitoring, ensures timely intervention when problems occur in the tunnel, and guarantees the safe operation of the tunnel.

[0014] 2. The present invention designs a fluid supply mechanism and a cleaning mechanism. By starting the drive motor, the automatic cleaning of the reflective indicator board is realized. The fluid supply mechanism can regularly spray water on the reflective indicator board, while the cleaning mechanism uses a rubber squeegee to scrape off the dust and stains on the reflective indicator board. With this structure, the anti-dust and dust-removing effect can be improved, and the possibility of secondary adhesion of dust is reduced.

[0015] 3. After the liquid is ejected, the gas ejection operation will be carried out. The jet air quickly dries the surface and avoids the formation of water stains. This design greatly improves the cleaning efficiency and cleaning effect of the reflective indicator board and ensures the accuracy of monitoring.

[0016] 4. Through the release of high-pressure fluid and the fluid pressure action of the piston cylinder, the contact between the rubber squeegee and the reflective indicator board is made closer, and the scraping effect is better. At the same time, after the cleaning is completed.

[0017] 5. After cleaning is completed, the rubber squeegee can quickly rotate back, scrape off the "sewage marks" located on its rear side, and fling them off, ensuring the cleanliness of the rubber squeegee and extending its service life.

[0018] In summary, during the actual use of this solution, it has beneficial effects such as accurate and reliable monitoring, high cleaning efficiency, good cleaning effect, and long service life, providing strong technical support for the monitoring and maintenance of tunnel pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a measuring device for monitoring points in TBM tunnel construction proposed by the present invention; Figure 2 is an enlarged view of the positioning component; Figure 3 is Figure 1 a schematic view of the right side perspective of; Figure 4 is Figure 3 a schematic cross-sectional structure diagram of; Figure 5 is Figure 4 an enlarged view of part A of; Figure 6 is a schematic diagram of the cooperation of structures such as the rotating cylinder, folded connecting rod, hollow strip, and rubber squeegee; Figure 7 is Figure 6 a schematic diagram of the structure after removing the rotating cylinder; Figure 8 is Figure 7 a schematic cross-sectional view of; Figure 9 is Figure 8 an enlarged view of part B of;

[0020] In the figure: 1 tunnel pipeline, 2 total station, 3 positioning component, 4 vertical plate, 5 mounting plate, 6 reflective indicator board, 7 water tank, 8 rotating shaft, 9 rotating cylinder, 10 fixing plate, 11 limiting plate, 12 connecting cylinder, 13 connecting hole, 14 first one-way pipe, 15 second one-way pipe, 16 gas-liquid discharge pipe, 17 torsion spring, 18 driving motor, 19 transmission part, 20 gearbox, 21 first piston cylinder, 22 one-way port, 23 first spring, 24 second piston plate, 25 first piston plate, 26 driving rod, 27 crankshaft, 28 third piston plate, 29 second spring, 30 folded connecting rod, 31 hollow strip, 32 second piston cylinder, 33 rubber squeegee, 34 gas-liquid discharge hole, 35 third spring, 36 piston column, 37 mounting column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] 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.

[0022] Reference Figures 1 - 9 , a measuring device for a TBM tunnel construction monitoring point, comprising a tunnel pipeline 1, a total station 2 is arranged at the inner bottom of the tunnel pipeline 1; As an embodiment of the present invention, it also includes a positioning assembly 3, which cooperates with the total station 2. The positioning assembly 3 includes a vertical plate 4, and the top of the vertical plate 4 is fixedly connected to a mounting plate 5, and a plurality of mounting holes are provided on the mounting plate 5. The left side of the vertical plate 4 is rotatably connected to a rotating shaft, and the left end of the rotating shaft is fixedly connected to a reflective indicator plate 6, and a cross mark is provided on the reflective indicator plate 6 to facilitate positioning to the center of the plate body; As an embodiment of the present invention, a cleaning mechanism is also included, which is used to clean the reflective indicator plate 6. The cleaning mechanism includes a rotating shaft 8 rotatably connected to the left side of the vertical plate 4, and the left end of the rotating shaft 8 is fixedly connected to a rotating cylinder 9. A third piston plate 28 that can slide up and down is provided in the rotating cylinder 9. The upper end of the third piston plate 28 is fixedly connected to a folding connecting rod 30, and the folding connecting rod 30 is a rod body provided with a through groove. Further, the aperture of the internal through groove is small. When a large gas or liquid enters the bottom of the rotating cylinder 9, the through groove is not enough to quickly The release flow causes a relatively large pressure at the bottom of the rotating cylinder 9. One end of the third piston plate 28 penetrates the third piston plate 28, and the other end extends to the inside of the hollow bar 31. The lower end of the third piston plate 28 is elastically connected to the inner bottom of the rotating cylinder 9 through the second spring 29. One of the vertical parts of the folded connecting rod 30 penetrates the inner top of the rotating cylinder 9. The other end of the folded connecting rod 30 is fixedly connected to the hollow bar 31. A rubber scraper 33 is arranged on the right side of the hollow bar 31. The rubber scraper 33 is inclined in the initial state, and its right side just fits with the left side of the reflective indicator plate 6 after moving up. As an embodiment of the present invention, a drive motor 18 is installed on the right side of the vertical plate 4. The start of the drive motor 18 can be controlled by a wireless module to achieve remote control. A gearbox 20 is installed on the right side of the vertical plate 4. The input shaft of the gearbox 20 passes through the vertical plate 4 and is fixedly connected to the right end of the rotating shaft. The input shaft of the gearbox 20 and the output shaft of the drive motor 18 are connected by a transmission member 19. The transmission member 19 includes two pulleys, which are respectively installed on the output shaft of the drive motor 18 and the input shaft of the gearbox 20. The gearbox 20 adopts a speed reduction box, which can accelerate the input shaft and output it from the output shaft. The two pulleys are connected by a transmission belt. As an implementation manner of the present invention, it further includes a fluid supply mechanism for supplying fluid. While improving the cleaning effect, the cleaning mechanism is operated. The fluid supply mechanism includes a first piston cylinder 21 installed on the right side of the vertical plate 4. A water tank 7 is fixedly connected to the right side of the vertical plate 4. The inner top space of the first piston cylinder 21 is communicated with the water tank 7 through a first one-way pipe 14. The inner top space of the first piston cylinder 21 is communicated with the outside through a one-way port 22. A connecting cylinder 12 is installed at the upper end of the water tank 7. The inner top of the connecting cylinder 12 is communicated with the outside through a connecting hole 13. A second piston plate 24 that can slide up and down is arranged in the connecting cylinder 12. The upper end of the second piston plate 24 is communicated with the inner top space of the connecting cylinder 12 through a first spring 23. The inner top space of the first piston cylinder 21 is communicated with the inner bottom space of the connecting cylinder 12 through a second one-way pipe 15. The inner bottom space of the connecting cylinder 12 is communicated with the inner bottom space of the rotating cylinder 9 through a gas-liquid discharge pipe 16. The gas-liquid discharge pipe 16 is a flexible pipe. A normally closed solenoid valve is installed inside the gas-liquid discharge pipe 16. An installation column 37 is installed at the inner top of the connecting cylinder 12. A touch delay switch is installed at the lower end of the installation column 37. The touch delay switch is electrically connected to the normally closed solenoid valve. It should be noted that a normally open solenoid valve is also installed inside the first one-way pipe 14, and this normally open solenoid valve is also electrically connected to the touch delay switch; As an implementation manner of the present invention, check valves are installed inside the first one-way pipe 14, the second one-way pipe 15, and the one-way port 22. The flow direction of the check valve inside the first one-way pipe 14 is from the water tank 7 to the inner top space of the first piston cylinder 21 unidirectionally. The flow direction of the check valve inside the second one-way pipe 15 is from the first piston cylinder 21 to the inner bottom space of the connecting cylinder 12 unidirectionally. The flow direction of the check valve inside the one-way port 22 is from the outside to the first piston cylinder 21 unidirectionally; As an implementation manner of the present invention, a plurality of gas-liquid discharge holes 34 are formed on the right side wall of the hollow strip 31. A plurality of second piston cylinders 32 are fixedly connected to the right side of the hollow strip 31. The left side spaces of the plurality of second piston cylinders 32 are all communicated with the inside of the hollow strip 31 through communication ports. The inner diameter of the second piston cylinder 32 is smaller than the inner diameter of the hollow strip 31. The inner diameter of the hollow strip 31 is smaller than the through groove inside the folded connecting rod 30. A piston column 36 that can slide left and right is arranged in each second piston cylinder 32. The left side of each piston column 36 is elastically connected to the left inner wall of the second piston cylinder 32 through a third spring 35. The right ends of the plurality of piston columns 36 are commonly fixedly connected to a rubber squeegee 33. The length of the rubber squeegee 33 is the same as the radius of the reflective indicator board 6. It should be noted that a fine hole (not shown) is provided in the rear side space of each second piston cylinder 32. The fine hole is a hole body structure with a relatively fine aperture. Further, the spring constants of the first spring 23, the second spring 29, and the third spring 35 decrease in sequence.

[0023] In the present invention, in actual use, the positioning assembly 3 is installed at the inner top position of the tunnel pipeline 1. Since the space is relatively open, the possibility of being blocked is reduced. Then, after placing the total station 2 at a fixed position, the total station 2 regularly monitors whether the coordinates of the reflective indicator plate 6 change, so that pipeline monitoring can be achieved, and timely intervention can be made when problems occur in the tunnel; Before each monitoring, the drive motor 18 can be started for a period of time (four minutes). The start of the drive motor 18 will rotate the input shaft of the gearbox 20 through the transmission member 19, and then use the rotating shaft to rotate the reflective indicator plate 6 at a low speed. Through the transmission of the gearbox 20, the crankshaft 27 can rotate quickly. The rotation of the crankshaft 27 will use the drive rod 26 to make the first piston plate 25 reciprocate up and down. The downward movement of the first piston plate 25 will draw air through the one-way port 22, and at the same time, draw water from the water tank 7 through the first one-way pipe 14. The upward movement of the first piston plate 25 will pass through the second one-way pipe 15. The water and gas are pressed into the connecting tube 12 together. Since the normally closed solenoid valve inside the gas-liquid discharge pipe 16 is closed at this time, the gas and liquid will gather at the bottom of the connecting tube 12 and push the second piston plate 24 to move up, compressing the first spring 23. Water and high-pressure gas gather under the second piston plate 24, with the water at the bottom and the gas at the top. As the amount of fluid increases, the second piston plate 24 moves up to the touch delay switch on the contact mounting column 37 (this process lasts about 90 seconds), and the normally closed solenoid valve and the normally open solenoid valve will be energized for a period of time (such as two minutes). At this time, the gas-liquid discharge pipe 16 is connected, and the high-pressure fluid is quickly released to the bottom of the rotating cylinder 9 (the release speed of the high-pressure fluid is further greater than the supply speed of the second one-way pipe 15). The aperture of the through groove inside the folded connecting rod 30 is small. When the high-pressure fluid enters the bottom of the rotating cylinder 9, the through groove is not enough to release the flow quickly, resulting in a large pressure at the bottom of the rotating cylinder 9, causing the third piston plate 28 to move up and stretch the second spring 29. The upward movement of the third piston plate 28 will drive the hollow bar 31 to move up through the folded connecting rod 30, so that the rubber scraper 33 moves up; When the high-pressure fluid is released, it will enter the hollow bar 31 through the through groove inside the folded connecting rod 30, and most of it will be directly discharged from the gas-liquid discharge hole 34, and a small part will enter the second piston cylinder 32 and finally be discharged from the fine hole; The folded connecting rod 30 drives the hollow strip 31 to move upward. When the rubber squeegee 33 moves upward until it touches the reflective indicator board 6, the rotation of the reflective indicator board 6 will drive the rubber squeegee 33 to rotate by using friction. The rotation direction of the reflective indicator board 6 is counterclockwise from the left side view. Therefore, it will drive the rubber squeegee 33 to rotate to a vertical state (rotating around the rotating shaft 8), and the rotating cylinder 9 will also rotate to a vertical state (rotating around the rotating shaft 8 until the rotating shaft 8 rotates until it touches the limiting plate 11 and the fixed plate 10). At this time, the torsion spring 17 is compressed. When the rubber squeegee 33 moves upward to the maximum position, it just covers the lower half of the reflective indicator board 6, and the plurality of gas-liquid discharge holes 34 just cover the upper half of the reflective indicator board 6. The plurality of gas-liquid discharge holes 34 spray out water during the upward movement, and cooperate with the rotation of the reflective indicator board 6 to evenly wet the reflective indicator board 6. As the reflective indicator board 6 rotates, the wetted dust and the mixture of water and dust will be scraped to the rear position of the rubber squeegee 33, realizing the cleaning of the reflective indicator board 6; Further, after a part of the fluid flows into the left space of the second piston cylinder 32, due to the difficulty of quickly discharging the fluid through the fine holes, the fluid pressure in the left space of the second piston cylinder 32 is relatively large. This fluid pressure will give the piston column 36 a force to the right, making the contact between the rubber squeegee 33 and the reflective indicator board 6 closer and the scraping effect better; It should be noted that when the liquid is sprayed out, air will be sprayed. After the gas is sprayed out from the plurality of gas-liquid discharge holes 34, it can quickly dry the small amount of water body that may remain on the surface of the rotating reflective indicator board 6, avoiding the formation of water stains; When the entire cleaning operation is completed, the drive motor 18 is turned off. At this time, the reflective indicator board 6 stops rotating. Under the elastic action of the torsion spring 17, the rotating shaft 8 will rotate back. And because the fluid supply mechanism also stops working at this time, the contact pressure between the rubber squeegee 33 and the reflective indicator board 6 decreases, so the contact friction decreases. It will rotate back at a relatively fast speed. The rotation of the rubber squeegee 33 will scrape off the "sewage mark" of the reflective indicator board 6 located behind the rubber squeegee 33. Finally, after the rubber squeegee 33 moves to the limit position, it stops moving, and the sewage mark will break away from the rubber squeegee 33 under the action of inertia, ensuring the cleanliness of the rubber squeegee 33 and completing the overall cleaning.

[0024] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A measuring device for TBM tunnel construction monitoring points, characterized in that, include: A tunnel pipeline (1), wherein a total station (2) is arranged at the inner bottom of the tunnel pipeline (1); A positioning assembly (3), the positioning assembly (3) cooperates with the total station (2), the positioning assembly (3) comprises a vertical plate (4), the left side of the vertical plate (4) is rotatably connected to a rotating shaft, the left end of the rotating shaft is fixedly connected to a reflective indicator plate (6), and the reflective indicator plate (6) is provided with a cross mark; A cleaning mechanism, the cleaning mechanism is used to clean the reflective indicator plate (6), the cleaning mechanism comprising a rotating shaft (8) rotatably connected to the left side of the vertical plate (4), the left end of the rotating shaft (8) being fixedly connected to a rotating cylinder (9), a third piston plate (28) being arranged in the rotating cylinder (9) and being capable of sliding up and down, the upper end of the third piston plate (28) being fixedly connected to a folding connecting rod (30), the lower end of the third piston plate (28) being elastically connected to the inner bottom of the rotating cylinder (9) via a second spring (29), one of the vertical portions of the folding connecting rod (30) passing through the inner top of the rotating cylinder (9), the other end of the folding connecting rod (30) being fixedly connected to a hollow bar (31), and a rubber scraper (33) being arranged on the right side of the hollow bar (31); The fluid supply mechanism is used to supply fluid to improve the cleaning effect and allow the cleaning mechanism to operate.

2. The measuring device for the TBM tunnel construction monitoring point according to claim 1, characterized in that, The top of the vertical plate (4) is fixedly connected to a mounting plate (5), and a plurality of mounting holes are provided on the mounting plate (5).

3. The measuring device for TBM tunnel construction monitoring points according to claim 1, characterized in that The folded connecting rod (30) is a rod body provided with a through groove, one end of which passes through the third piston plate (28) and the other end of which extends into the interior of the hollow bar (31).

4. The measuring device for the TBM tunnel construction monitoring point according to claim 1, characterized in that, A drive motor (18) is installed on the right side of the vertical plate (4), and a gearbox (20) is installed on the right side of the vertical plate (4). An input shaft of the gearbox (20) passes through the vertical plate (4) and is fixedly connected to the right end of the rotating shaft. The input shaft of the gearbox (20) and the output shaft of the drive motor (18) are connected in transmission via a transmission member (19).

5. The measuring device for the TBM tunnel construction monitoring point according to claim 4, characterized in that, The transmission member (19) comprises two pulleys, the two pulleys being respectively mounted on the output shaft of the drive motor (18) and the input shaft of the gearbox (20), and the two pulleys being connected via a transmission belt.

6. The measuring device for the monitoring points in TBM tunnel construction according to claim 4, characterized in that, The fluid supply mechanism includes a first piston cylinder (21) installed on the right side of the vertical plate (4). A water tank (7) is fixedly connected to the right side of the vertical plate (4). The inner top space of the first piston cylinder (21) is communicated with the water tank (7) through a first one-way pipe (14). The inner top space of the first piston cylinder (21) is communicated with the outside through a one-way port (22). A connecting cylinder (12) is installed at the upper end of the water tank (7). The inner top of the connecting cylinder (12) is communicated with the outside through a connecting hole (13). A second piston plate (24) that can slide up and down is arranged inside the connecting cylinder (12). The upper end of the second piston plate (24) is communicated with the inner top space of the connecting cylinder (12) through a first spring (23). The inner top space of the first piston cylinder (21) is communicated with the inner bottom space of the connecting cylinder (12) through a second one-way pipe (15). The inner bottom space of the connecting cylinder (12) is communicated with the inner bottom space of the rotating cylinder (9) through a gas-liquid discharge pipe (16). The gas-liquid discharge pipe (16) is a flexible pipe.

7. The measuring device for the TBM tunnel construction monitoring point according to claim 6, characterized in that, A normally closed solenoid valve is installed inside the gas-liquid discharge pipe (16). An installation column (37) is installed at the inner top of the connecting cylinder (12). A touch delay switch is installed at the lower end of the installation column (37). The touch delay switch is electrically connected to the normally closed solenoid valve.

8. The measuring device for the monitoring point of TBM tunnel construction according to claim 6, characterized in that, One-way valves are installed inside the first one-way pipe (14), the second one-way pipe (15), and the one-way port (22). The flow direction of the one-way valve inside the first one-way pipe (14) is from the water tank (7) to the inner top space of the first piston cylinder (21) unidirectionally. The flow direction of the one-way valve inside the second one-way pipe (15) is from the first piston cylinder (21) to the inner bottom space of the connecting cylinder (12) unidirectionally. The flow direction of the one-way valve inside the one-way port (22) is from the outside to the first piston cylinder (21) unidirectionally.

9. The measuring device for a TBM tunnel construction monitoring point according to claim 1, characterized in that, A plurality of gas-liquid discharge holes (34) are formed on the right side wall of the hollow bar (31). A plurality of second piston cylinders (32) are fixedly connected to the right side of the hollow bar (31). The left side spaces of the plurality of second piston cylinders (32) are all communicated with the inside of the hollow bar (31) through communication ports. A piston column (36) that can slide left and right is arranged inside each second piston cylinder (32). The left side of each piston column (36) is elastically connected to the left inner wall of the second piston cylinder (32) through a third spring (35). The right ends of the plurality of piston columns (36) are commonly fixedly connected to a rubber squeegee (33).

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