Tunnel deformation monitoring device after tunnel excavation

Abstract

The invention discloses a tunnel deformation monitoring device after tunnel excavation, and particularly relates to the field of tunnel deformation monitoring, the tunnel deformation monitoring device comprises a displacement meter and a detection pipe, the displacement meter is used for being inserted into the detection pipe, a bottom plate is installed at the upper end of the detection pipe, a power assembly is installed on the bottom plate, and a lower pressing plate is installed at the output end of the power assembly; the power assembly is used for driving the pressing plate to press the guide wheel of the displacement meter, so that the displacement meter is pressed into the detection pipe. Through the arrangement of the lower pressing plate, the power assembly, the middle push plate and the driving assembly, on one hand, a guide wheel below can be automatically aligned with a guide groove through rotation of the middle push plate so that the guide wheel can enter the guide groove conveniently, and on the other hand, the guide wheel can be pressed downwards through the lower pressing plate so that a section can enter a detection pipe; therefore, the purpose of automatically inserting the displacement meter is achieved, dragging by multiple persons is not needed any more, and the problem of dragging damage can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel deformation monitoring, and more particularly to a device for monitoring tunnel deformation after tunnel excavation. Background Art

[0002] A tunnel is an engineering structure buried in the ground and a form of human utilization of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mining tunnels, and military tunnels. The definition of a tunnel is: "A cavern with a cross-sectional area greater than 2 square meters, built underground by any method in a specified shape and size for a certain purpose." After the tunnel is excavated, deformation monitoring is required to ensure the safety of the tunnel.

[0003] Currently, segmental displacement meters are commonly used. These meters are equipped with inclination sensors. After a measuring hole is dug in the tunnel and a detection tube is inserted, the segmental displacement meter is placed inside. The horizontal displacement is calculated based on the inclination angle. By measuring displacement changes in real time, potential problems can be identified and appropriate countermeasures can be implemented.

[0004] The segmental displacement meter is mainly composed of segments, connectors, and guide wheels. Through the connectors, multiple segments can be connected in sequence, so that the horizontal displacement of each height of the measuring hole can be measured.

[0005] Since more segments are needed for measurement, the current method is to assemble a large number of segments together in advance. When placing them into the measuring hole, multiple people are needed to drag them, which not only wastes time but also makes them easily damaged during dragging. Summary of the Invention

[0006] The present invention provides a tunnel deformation monitoring device after tunnel excavation, which aims to solve the problem that a large number of segments are assembled together in advance and placed into a measuring hole, which requires multiple people to drag them, delaying the time and making them easy to be damaged during dragging.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a device for monitoring deformation of a tunnel after tunnel excavation, comprising a displacement meter and a detection tube, the displacement meter being used to be inserted into the interior of the detection tube, a base plate being installed at the upper end of the detection tube, a power assembly being installed on the base plate, a lower pressure plate being installed at the output end of the power assembly, the power assembly being used to drive the lower pressure plate to press down the guide wheel of the displacement meter, thereby pressing the displacement meter into the interior of the detection tube; the device for monitoring deformation of a tunnel after tunnel excavation also comprises a middle push plate for being arranged on one side of the upper end of the detection tube, one end of the middle push plate being close to the axis of the detection tube, and the other end of the middle push plate being away from the axis of the detection tube, a drive assembly being further provided on the base plate, the drive assembly being used to drive the middle push plate to rotate around the axis of the detection tube, thereby pushing the guide wheel of the displacement meter toward the axis of the detection tube.

[0008] In a preferred embodiment, the displacement meter includes multiple segments and connecting parts, and the multiple segments are connected end to end in sequence through the connecting parts. The upper and lower ends of the segments are rotatably connected to wheel rods through torsion springs, and both ends of the wheel rods are rotatably connected to guide wheels. The guide wheel on one side of the segment is tilted downward, and the guide wheel on the other side is tilted upward.

[0009] In a preferred embodiment, the power assembly includes two motors, which are fixedly mounted on the base plate. The output shafts of the two motors are fixedly mounted with screws, a worm gear is provided between the two screws, and the worm gear is engaged with the two screws for transmission. A guide rod is fixedly mounted on the base plate, and a movable frame is provided on the vertical sliding sleeve of the guide rod. The middle part of the worm gear is fixedly connected to the main shaft, one end of the main shaft is rotatably connected to the movable frame, and the lower pressure plate is fixedly mounted on the other end of the main shaft.

[0010] In a preferred embodiment, the lower pressing plate includes a connecting portion and a pressing portion, the connecting portion is arranged along the radial direction of the worm gear, and the connecting portion and the pressing portion form a V-shaped structure.

[0011] In a preferred embodiment, the driving assembly includes a fixed ring, which is fixedly sleeved on the upper end of the detection tube, and the outer side of the fixed ring is rotatably connected to gear 1, and the base plate is rotatably connected to a vertical shaft, and gear 2 is sleeved on the vertical shaft, and gear 2 is engaged with gear 1, and the middle push plate is fixedly installed on gear 1; the driving assembly also includes a first bevel gear and a second bevel gear, the first bevel gear is rotatably connected to the movable frame and vertically slidably set on the vertical shaft, the second bevel gear is fixed at one end of the main shaft, and the first bevel gear and the second bevel gear are engaged for transmission.

[0012] In a preferred embodiment, an arc-shaped slide groove is opened at the upper end of the base plate, a slider is fixedly connected to the lower surface of gear one, the slider is slidably set in the arc-shaped slide groove, a spring one is set inside the arc-shaped slide groove, and the two ends of the spring one are respectively pressed with the arc-shaped slide groove and the slider.

[0013] In a preferred embodiment, gear two is vertically slidably set on the vertical shaft, and a limit block is fixedly connected to the vertical shaft. When gear two is engaged with gear one, gear two contacts the lower surface of the limit block. Spring two is sleeved on the bottom of the vertical shaft, and the two ends of spring two are respectively pressed with gear two and the bottom plate. A pressure rod is fixedly connected to the movable frame, and the pressure rod is used to press gear two down.

[0014] In a preferred embodiment, a limit rod is fixedly connected to the bottom plate, and a limit groove is provided on the upper end of the limit rod close to the displacement meter, and the limit groove is used for the guide wheel to roll inside.

[0015] In a preferred embodiment, the tunnel deformation monitoring device after tunnel excavation further includes a protective tube, the upper end cover of the protective tube is provided with a protective cover, the protective tube is arranged outside the power assembly and the displacement meter, and the bottom of the protective tube is fixed to the base plate.

[0016] In a preferred embodiment, the device for monitoring deformation of a tunnel after tunnel excavation further comprises a concrete base, the bottom plate is pre-buried in the concrete base, and a plurality of lighting lamps are installed on the concrete base.

[0017] The present invention also provides a monitoring method using the above-mentioned tunnel deformation monitoring device after tunnel excavation, comprising the following steps: Step 1: Place the displacement meter on the upper end of the detection tube, with the guide wheel located below it on the outside of the upper end of the detection tube; Step 2: The driving assembly drives the middle push plate to rotate around the axis of the detection tube, thereby pushing the guide wheel of the displacement meter toward the axis of the detection tube; Step 3: The power assembly drives the lower pressure plate to press down the guide wheel of the displacement meter, thereby pressing the displacement meter into the interior of the detection tube.

[0018] Technical effects and advantages of the present invention: The present invention provides a lower pressure plate, a power assembly, a middle push plate and a drive assembly. On the one hand, the rotation of the middle push plate can automatically align the guide wheel below with the guide groove so that the guide wheel can enter the interior of the guide groove. On the other hand, the guide wheel can be pressed down by the lower pressure plate to make the segment enter the interior of the detection tube, thereby achieving the purpose of automatically inserting the displacement meter. There is no need for multiple people to drag it, which can prevent the problem of dragging damage.

[0019] The present invention provides a lower pressure plate, which, on the one hand, can drive the lower pressure plate to move downward to insert the segment into the interior of the detection tube, and on the other hand, can control the rotation of the lower pressure plate. When it is necessary to press down the guide wheel, the lower pressure part is rotated to directly above the guide wheel, and when it is not necessary to press down the guide wheel, the lower pressure part is rotated to one side of the guide wheel to prevent the lower pressure part from hitting the upper guide wheel when moving upward. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the appearance of the present invention after installation.

[0021] Figure 2 The internal structure of the present invention is schematically shown as a whole Figure 1 .

[0022] Figure 3 The internal structure of the present invention is schematically shown as a whole Figure 2 .

[0023] Figure 4 Schematic diagram of the displacement meter and detection tube of the present invention.

[0024] Figure 5 Schematic diagram of the power assembly of the present invention.

[0025] Figure 6Schematic diagram of the installation of the drive assembly of the present invention.

[0026] Figure 7 This is a schematic diagram of the installation of the first bevel gear and the second bevel gear of the present invention.

[0027] Figure 8 For the present invention Figure 7 Exploded diagram.

[0028] Figure 9 This is an exploded view of the installation of the slider of the present invention.

[0029] Figure 10 Schematic diagram of the lower pressing plate before and after rotation of the present invention.

[0030] Figure 11 Flow chart of the monitoring method of the present invention.

[0031] The accompanying drawings are marked as follows: 1. base plate; 11. arc-shaped slide groove; 2. lower pressure plate; 21. connecting part; 22. lower pressure part; 3. power assembly; 31. motor; 32. screw; 33. worm gear; 34. guide rod; 35. movable frame; 36. main shaft; 4. middle push plate; 5. drive assembly; 51. fixing ring; 52. gear 1; 521. slider; 53. vertical axis; 531. limit block; 54. gear 2; 55. first bevel gear; 56. second bevel gear; 6. spring 1; 7. spring 2; 8. pressure rod; 9. limit rod; 91. limit groove; 100. displacement meter; 101. segment; 102. wheel rod; 103. guide wheel; 104. connecting part; 200. detection tube; 201. guide groove; 300. protective tube; 301. protective cover; 302. lighting lamp; 400. concrete base. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Refer to the instruction manual Figures 1-11, a tunnel deformation monitoring device after tunnel excavation includes a displacement meter 100 and a detection tube 200, the displacement meter 100 is used to be inserted into the detection tube 200, the upper end of the detection tube 200 is installed with a base plate 1, and a power assembly 3 is installed on the base plate 1, and a lower pressure plate 2 is installed at the output end of the power assembly 3, and the power assembly 3 is used to drive the lower pressure plate 2 to press down the guide wheel 103 of the displacement meter 100, thereby pressing the displacement meter 100 into the interior of the detection tube 200; the tunnel deformation monitoring device after tunnel excavation also includes a middle push plate 4 for being arranged on one side of the upper end of the detection tube 200, one end of the middle push plate 4 is close to the axis of the detection tube 200, and the other end of the middle push plate 4 is away from the axis of the detection tube 200, and a driving assembly 5 is also provided on the base plate 1, and the driving assembly 5 is used to drive the middle push plate 4 to rotate around the axis of the detection tube 200, thereby pushing the guide wheel 103 of the displacement meter 100 toward the axis direction of the detection tube 200.

[0034] In the above technical solution, if Figure 4 As shown, the displacement meter 100 includes multiple segments 101 and connecting members 104. The multiple segments 101 are connected end to end in sequence through the connecting members 104. The upper and lower ends of the segments 101 are rotatably connected to the wheel rod 102 through a torsion spring. Both ends of the wheel rod 102 are rotatably connected to the guide wheel 103. The guide wheel 103 on one side of the segment 101 is tilted downward, and the guide wheel 103 on the other side is tilted upward.

[0035] It should be noted that the displacement meter 100 adopts the existing technical structure, and an inclination sensor is set inside the segment 101. During measurement, the inclination sensor measures the inclination of the segment 101 at that position, and the horizontal displacement can be calculated based on the inclination. Multiple segments 101 can measure horizontal displacement data at different depths.

[0036] In the above technical solution, if Figure 2-Figure 3 、 Figure 5 As shown, the power assembly 3 includes two motors 31, and the two motors 31 are fixedly mounted on the base plate 1. The output shafts of the two motors 31 are fixedly mounted with screws 32, and a worm gear 33 is arranged between the two screws 32. The worm gear 33 is engaged with the two screws 32 for transmission. A guide rod 34 is fixedly mounted on the base plate 1, and a movable frame 35 is provided on the vertical sliding sleeve of the guide rod 34. The middle part of the worm gear 33 is fixedly connected to the main shaft 36, and one end of the main shaft 36 is rotatably connected to the movable frame 35, and the lower pressure plate 2 is fixedly mounted on the other end of the main shaft 36.

[0037] It should be noted that when the two motors 31 rotate in the same direction and at the same speed, they can drive the worm gear 33 to move up and down, with the upward or downward movement determined by the rotation direction of the output shaft of the motor 31. When the two motors 31 rotate in opposite directions and at the same speed, the height of the worm gear 33 remains unchanged, but it rotates in a direction determined by the rotation direction of the output shaft of the motor 31. The worm gear 33 can drive the main shaft 36 to rotate, and the main shaft 36 can drive the power assembly 3 to rotate.

[0038] In the above technical solution, if Figure 6 As shown, the lower pressing plate 2 includes a connecting portion 21 and a pressing portion 22 . The connecting portion 21 is arranged along the radial direction of the worm gear 33 , and the connecting portion 21 and the pressing portion 22 form a V-shaped structure.

[0039] It should be noted that when the main shaft 36 drives the lower pressure plate 2 to rotate, causing the lower pressure part 22 to rotate above the guide wheel 103, the power component 3 then drives the worm gear 33 to move downward, so that the guide wheel 103 can be pressed down by the lower pressure part 22, thereby pressing the displacement meter 100 into the interior of the detection tube 200.

[0040] In the above technical solution, if Figure 2-Figure 3 、 Figure 6-Figure 8 As shown, the driving assembly 5 includes a fixed ring 51, which is fixedly sleeved on the upper end of the detection tube 200, and the outer side of the fixed ring 51 is rotatably connected to a gear 1 52, and a vertical shaft 53 is rotatably connected to the base plate 1, and a gear 2 54 is sleeved on the vertical shaft 53, and the gear 2 54 is meshed with the gear 1 52, and the middle push plate 4 is fixedly mounted on the gear 1 52; the driving assembly 5 also includes a first bevel gear 55 and a second bevel gear 56, the first bevel gear 55 is rotatably connected to the movable frame 35 and is vertically slidably set on the vertical shaft 53, the second bevel gear 56 is fixed to one end of the main shaft 36, and the first bevel gear 55 and the second bevel gear 56 are meshed for transmission.

[0041] It should be noted that when the worm gear 33 rotates, the worm gear 33 drives the second bevel gear 56 to rotate through the main shaft 36, the second bevel gear 56 drives the first bevel gear 55 to rotate, the first bevel gear 55 drives the vertical shaft 53 to rotate, the vertical shaft 53 drives the second gear 54 to rotate, the second gear 54 drives the first gear 52 to rotate, and the first gear 52 drives the middle push plate 4 to rotate around the axis of the detection tube 200. Figure 6 In the top view, when the gear 1 52 drives the middle push plate 4 to rotate clockwise, the middle push plate 4 can push the guide wheel 103 toward the middle of the detection tube 200.

[0042] In the above technical solution, if Figure 6-Figure 7 、 Figure 9As shown, an arc-shaped slide groove 11 is provided at the upper end of the base plate 1, and a slider 521 is fixedly connected to the lower surface of the gear 1 52. The slider 521 is slidably set in the arc-shaped slide groove 11. A spring 16 is set inside the arc-shaped slide groove 11, and the two ends of the spring 16 are pressed against the arc-shaped slide groove 11 and the slider 521 respectively.

[0043] Furthermore, gear 2 54 is vertically slidably set on the vertical shaft 53, and a limit block 531 is fixedly connected to the vertical shaft 53. When gear 2 54 is engaged with gear 1 52, gear 2 54 contacts the lower surface of the limit block 531. A spring 2 7 is sleeved on the bottom of the vertical shaft 53, and the two ends of the spring 2 7 are respectively pressed with gear 2 54 and the bottom plate 1. A pressure rod 8 is fixedly connected to the movable frame 35, and the pressure rod 8 is used to press gear 2 54 downward.

[0044] In this embodiment, a guide groove 201 is formed on each side of the detection tube 200. When the displacement meter 100 is inserted into the detection tube 200, the guide wheels 103 on either side of the segment 101 slide within the guide grooves 201 on either side. When installing the displacement meter 100, multiple segments 101 need to be inserted into the detection tube 200 to facilitate measuring horizontal displacement at different depths.

[0045] The initial state is Figure 2 、 Figure 3 、 Figure 6 As shown, the connecting portion 21 and the pressing portion 22 are in a horizontal state. Figure 10 As shown in the left picture.

[0046] (1) First, place the first segment 101 on the upper end of the detection tube 200, with the guide wheel 103 located below being located outside the upper end of the detection tube 200. Then, install the second segment 101 on the upper end of the first segment 101 through the connector 104. After installation, prepare to press the segment 101 down into the interior of the detection tube 200.

[0047] (2) Then, the two motors 31 rotate in the same direction and at the same speed to drive the worm gear 33 to move upward (when the worm gear 33 moves upward, the moving frame 35, the main shaft 36, the first bevel gear 55, and the second bevel gear 56 move together). When the lower pressing plate 2 moves to the top of the guide wheel 103 located above the first root segment 101, the two motors 31 rotate in opposite directions and at the same speed. The two motors 31 drive the worm gear 33 to rotate, and the worm gear 33 drives the lower pressing part 22 to rotate through the main shaft 36, so that the connecting part 21 rotates to a vertical state, and the lower pressing part 22 rotates to the top of the guide wheel 103, as shown in FIG. Figure 10As shown in the right figure of FIG. During this process, the main shaft 36 drives the second bevel gear 56 to rotate, which in turn drives the first bevel gear 55 to rotate. The first bevel gear 55 drives the second gear 54 to rotate via the vertical shaft 53. The second gear 54 drives the first gear 52 and the middle push plate 4 to rotate. The end of the middle push plate 4 pushes the guide wheel 103 toward the center axis of the detection tube 200, thereby aligning the guide wheel 103 located below with the guide groove 201. When the gear 1 52 rotates, the slider 521 presses the spring 1 6, compressing it.

[0048] (3) Secondly, the two motors 31 rotate in the same direction and at the same speed to drive the worm gear 33 to move downward. At this time, the lower pressure part 22 pushes the guide wheel 103 downward, so that the lower guide wheel 103 enters the guide groove 201 and the segment 101 enters the detection tube 200 until the upper guide wheel 103 moves to the upper end of the detection tube 200. During the downward movement of the worm gear 33, the moving frame 35 drives the pressure rod 8 to move downward. When the pressure rod 8 contacts the gear 2 54, it pushes the gear 2 54 to move downward and disengage from the meshing state with the gear 1 52. The spring 1 6 pushes the slider 521 to move, so that the gear 1 52 and the middle push plate 4 rotate and reset. It should be noted that the purpose of the disengagement of the gear 2 54 and the gear 1 52 is to reset the gear 1 52 and the middle push plate 4 in advance to prevent the upper guide wheel 103 from colliding with the middle push plate 4 when moving downward.

[0049] (4) Finally, the worm wheel 33 is driven to move upward a short distance, and then the worm wheel 33 is driven to rotate, so as to drive the lower pressing plate 2 to rotate and reset to the position as shown in FIG. Figure 10 The state shown in the left figure, and then, the worm gear 33 is driven to move upward a distance, so that the pressure rod 8 is disengaged from the gear 2 54, and the spring 2 7 pushes the gear 2 54 upward so that the gear 2 54 re-engages with the gear 1 52.

[0050] Connect another segment 101 to the second segment 101 through the connector 104, and repeat the above (1)-(4). It should be noted that when the segment 101 is inserted into the interior of the detection tube 200, the staff can manually support the segment 101 to prevent it from tilting excessively. After the required displacement meter 100 is inserted into the interior of the detection tube 200, deformation measurement can be carried out, that is, the horizontal displacement at each depth is measured and calculated by the inclination sensor on the displacement meter 100, so as to timely discover potential problems, such as measuring stratum compression or lining voids. If the inclination of a segment continues to increase, uneven settlement will occur in the corresponding area. If a sudden change in displacement occurs, rock instability may occur.

[0051] The above technical solution is provided with a lower pressure plate 2, a power component 3, a middle push plate 4, and a drive component 5. On the one hand, the rotation of the middle push plate 4 can automatically align the lower guide wheel 103 with the guide groove 201, so that the guide wheel 103 can enter the interior of the guide groove 201. On the other hand, the guide wheel 103 can be pressed down by the lower pressure plate 2 to make the segment 101 enter the interior of the detection tube 200, thereby achieving the purpose of automatically inserting the displacement meter 100, and no longer requiring multiple people to drag it, which can prevent the problem of dragging damage.

[0052] The above technical solution is achieved by setting a lower pressure plate 2, which, on the one hand, can drive the lower pressure plate 2 to move downward to insert the segment 101 into the interior of the detection tube 200, and on the other hand, can control the rotation of the lower pressure plate 2. When it is necessary to press down the guide wheel 103, the lower pressure part 22 is rotated to the top of the guide wheel 103, and when it is not necessary to press down the guide wheel 103, the lower pressure part 22 is rotated to one side of the guide wheel 103 to prevent the lower pressure part 22 from hitting the upper guide wheel 103 when moving upward.

[0053] Refer to the instruction manual Figure 2 A limit rod 9 is fixedly connected to the bottom plate 1, and a limit groove 91 is provided on the upper end of the limit rod 9 close to the displacement meter 100, and the limit groove 91 is used for the guide wheel 103 to roll inside.

[0054] It should be noted that when the first segment 101 is initially inserted, the guide wheel 103 on the right is located inside the limit groove 91. The purpose is to prevent the segment 101 from rotating when the middle push plate 4 pushes the guide wheel 103 on the left, which will cause the guide wheel 103 to be unable to be pushed and the guide wheel 103 to be unable to be aligned with the guide groove 201.

[0055] Refer to the instruction manual Figure 1 The tunnel deformation monitoring device after tunnel excavation also includes a protective tube 300. The upper end cover of the protective tube 300 is provided with a protective cover 301. The protective tube 300 is arranged on the outside of the power component 3 and the displacement meter 100, and the bottom of the protective tube 300 is fixed on the base plate 1.

[0056] Furthermore, the device for monitoring deformation of a tunnel after tunnel excavation further includes a concrete base 400 , the bottom plate 1 is pre-buried on the concrete base 400 , and a plurality of lighting lamps 302 are installed on the concrete base 400 .

[0057] It should be noted that by providing the protective tube 300 and the protective cover 301, the internal structure can be protected. By pre-embedding the bottom plate 1 on the concrete base 400, the stability of the bottom plate 1 can be improved. The provision of 302 facilitates the operation of the staff in the optically dim tunnel.

[0058] Refer to the instruction manual Figure 11This embodiment further provides a monitoring method using the above-mentioned tunnel deformation monitoring device after tunnel excavation, comprising the following steps: Step 1: Place the displacement meter 100 on the upper end of the detection tube 200, and the guide wheel 103 located below is located outside the upper end of the detection tube 200; Step 2: The driving assembly 5 drives the middle push plate 4 to rotate around the axis of the detection tube 200, thereby pushing the guide wheel 103 of the displacement meter 100 toward the axis of the detection tube 200; Step 3: The power assembly 3 drives the lower pressing plate 2 to press down the guide wheel 103 of the displacement meter 100 , thereby pressing the displacement meter 100 into the interior of the detection tube 200 .

[0059] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for monitoring tunnel deformation after tunnel excavation, characterized by: The invention comprises a displacement meter (100) and a detection tube (200), wherein the displacement meter (100) is used to be inserted into the interior of the detection tube (200), a bottom plate (1) is installed at the upper end of the detection tube (200), a power assembly (3) is installed on the bottom plate (1), a lower pressing plate (2) is installed at the output end of the power assembly (3), and the power assembly (3) is used to drive the lower pressing plate (2) to press down the guide wheel (103) of the displacement meter (100), thereby pressing the displacement meter (100) into the interior of the detection tube (200); The tunnel deformation monitoring device after tunnel excavation further comprises a middle push plate (4) for being arranged on one side of the upper end of the detection tube (200), one end of the middle push plate (4) being close to the axis of the detection tube (200), and the other end of the middle push plate (4) being away from the axis of the detection tube (200), and a driving assembly (5) being further arranged on the bottom plate (1), and the driving assembly (5) being used to drive the middle push plate (4) to rotate around the axis of the detection tube (200), thereby pushing the guide wheel (103) of the displacement meter (100) toward the axis direction of the detection tube (200).

2. The device for monitoring tunnel deformation after tunnel excavation according to claim 1, characterized in that: The displacement meter (100) comprises a plurality of segments (101) and a connecting member (104). The plurality of segments (101) are connected end to end in sequence via the connecting member (104). The upper end and the lower end of the segment (101) are both rotatably connected to a wheel rod (102) via a torsion spring. Both ends of the wheel rod (102) are rotatably connected to a guide wheel (103). The guide wheel (103) on one side of the segment (101) is tilted downward, and the guide wheel (103) on the other side is tilted upward.

3. The device for monitoring tunnel deformation after tunnel excavation according to claim 1, characterized in that: The power assembly (3) includes two motors (31), the two motors (31) are fixedly mounted on the base plate (1), the output shafts of the two motors (31) are fixedly mounted with screws (32), a worm gear (33) is provided between the two screws (32), the worm gear (33) and the two screws (32) are meshed and driven, a guide rod (34) is fixedly mounted on the base plate (1), a movable frame (35) is provided on the vertical sliding sleeve of the guide rod (34), a main shaft (36) is fixedly connected to the middle part of the worm gear (33), one end of the main shaft (36) is rotatably connected to the movable frame (35), and the lower pressure plate (2) is fixedly mounted on the other end of the main shaft (36).

4. The device for monitoring tunnel deformation after tunnel excavation according to claim 1, characterized in that: The lower pressing plate (2) comprises a connecting portion (21) and a pressing portion (22), wherein the connecting portion (21) is arranged along the radial direction of the worm wheel (33), and the connecting portion (21) and the pressing portion (22) form a V-shaped structure.

5. The device for monitoring tunnel deformation after tunnel excavation according to claim 3, characterized in that: The driving assembly (5) includes a fixed ring (51), the fixed ring (51) is fixedly sleeved on the upper end of the detection tube (200), the outer side of the fixed ring (51) is rotatably connected to a gear 1 (52), the bottom plate (1) is rotatably connected to a vertical shaft (53), the vertical shaft (53) is sleeved with a gear 2 (54), the gear 2 (54) is meshed with the gear 1 (52), and the middle push plate (4) is fixedly mounted on the gear 1 (52); the driving assembly (5) also includes a first bevel gear (55) and a second bevel gear (56), the first bevel gear (55) is rotatably connected to the moving frame (35) and is vertically slidably arranged on the vertical shaft (53), the second bevel gear (56) is fixed to one end of the main shaft (36), and the first bevel gear (55) and the second bevel gear (56) are meshed and transmitted.

6. The device for monitoring tunnel deformation after tunnel excavation according to claim 5, characterized in that: An arc-shaped slide groove (11) is provided at the upper end of the base plate (1), a slider (521) is fixedly connected to the lower surface of the gear 1 (52), and the slider (521) is slidably arranged in the arc-shaped slide groove (11). A spring 1 (6) is provided inside the arc-shaped slide groove (11), and the two ends of the spring 1 (6) are respectively pressed against the arc-shaped slide groove (11) and the slider (521).

7. The device for monitoring tunnel deformation after tunnel excavation according to claim 6, characterized in that: The gear 2 (54) is vertically slidably arranged on the vertical shaft (53), and a limit block (531) is fixedly connected to the vertical shaft (53). When the gear 2 (54) is engaged with the gear 1 (52), the gear 2 (54) contacts the lower surface of the limit block (531). The bottom of the vertical shaft (53) is provided with a spring 2 (7), and the two ends of the spring 2 (7) are respectively pressed with the gear 2 (54) and the bottom plate (1). The movable frame (35) is fixedly connected with a pressure rod (8), and the pressure rod (8) is used to press the gear 2 (54) downward.

8. The device for monitoring tunnel deformation after tunnel excavation according to claim 1, characterized in that: A limiting rod (9) is fixedly connected to the bottom plate (1), and a limiting groove (91) is provided on the upper end of the limiting rod (9) close to the displacement meter (100). The limiting groove (91) is used for the guide wheel (103) to roll inside.

9. The device for monitoring tunnel deformation after tunnel excavation according to claim 1, characterized in that: The post-tunnel excavation tunnel deformation monitoring device further comprises a protective cylinder (300), the upper end cover of the protective cylinder (300) being provided with a protective cover (301), the protective cylinder (300) being arranged outside the power assembly (3) and the displacement meter (100), and the bottom of the protective cylinder (300) being fixed on the base plate (1).

10. The device for monitoring tunnel deformation after tunnel excavation according to claim 9, characterized in that: The tunnel deformation monitoring device after tunnel excavation further comprises a concrete base (400), the bottom plate (1) is pre-buried in the concrete base (400), and a plurality of lighting lamps (302) are installed on the concrete base (400).

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