A settling displacement monitoring device for a subway shield tunnel passing under a bridge pier

Abstract

The present invention relates to the field of bridge monitoring technology, specifically to a settlement displacement monitoring device for a bridge pier under a subway shield tunnel, comprising a signal receiver and a mounting seat, wherein the signal receiver is fixed on the upper end face of the mounting seat, a plurality of fixed guide bars are horizontally laid on the roadbed surface, and guide grooves are provided in the plurality of fixed guide bars, a rotating shaft rod is symmetrically arranged on the lower surface of the mounting seat for rotation, and rolling wheels are installed on both end faces of the symmetrical rotating shaft rod, the two symmetrical rotating shaft rods are connected to each other through pulleys and belts, the rolling wheels on the left and right side faces of the mounting seat are in rotational contact with the guide groove, a support rod is fixed on the top face of the mounting seat, and the upper end face of the support rod supports the signal receiver, the present invention enables a single signal receiver to transmit corresponding signals to each signal generator on a plurality of bridge piers by continuously moving the mounting seat on the fixed guide bar, thereby facilitating rapid and accurate settlement displacement monitoring of a plurality of bridge piers.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge monitoring, and in particular to a device for monitoring the settlement and displacement of a bridge pier under a subway shield tunnel. Background Art

[0002] With the continuous development of my country's rail transit, the phenomenon of shield tunnels passing through bridges is very common in the construction of urban subways. During construction, tunnel excavation will cause the surrounding strata to deform, resulting in displacement and additional internal forces in adjacent bridge piles, which in turn affects the stability of the bridge superstructure and seriously threatens the driving safety on the bridge. With the development of society, the development of highways is also changing with each passing day.

[0003] When it is necessary to monitor the settlement and displacement of bridge piers under a shield-constructed subway tunnel, since subway tunnels are generally long, there is more than one bridge pier above the subway tunnel along its length. Therefore, it is necessary to monitor the settlement and displacement of multiple bridge piers. Most of the existing equipment for monitoring the settlement and displacement of bridge piers is to fix a signal receiver on the roadbed surface on one side of the bridge pier through a mounting base, and then install a signal generator on the corresponding bridge pier. If there are many bridge piers above the subway shield tunnel, it is necessary to install corresponding signal receivers and signal generators one by one through multiple mounting bases, which may easily lead to waste of monitoring equipment. At the same time, monitoring personnel are required to watch the monitors on one side of the bridge piers at different positions one by one in order to calculate the settlement and displacement data generated by the bridge piers at different positions, which affects the efficiency of the monitoring equipment in monitoring the bridge piers under the subway shield tunnel. Summary of the Invention

[0004] The purpose of the present invention is to provide a settlement and displacement monitoring device for a subway shield tunnel passing under a bridge pier, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for monitoring the settlement and displacement of a bridge pier under a subway shield tunnel, comprising a signal receiver and a mounting base, wherein a signal receiver is fixed on the upper end face of the mounting base, and the mounting base slides on the roadbed surfaces on both sides of the bridge pier through a sliding guide mechanism, thereby facilitating the signal receiver to slide horizontally on the roadbed surface to receive signals from signal generators respectively fixed on multiple bridge piers above the subway shield tunnel passing under it, thereby facilitating sliding fixed-point settlement and displacement monitoring of multiple bridge wheels.

[0006] Furthermore, the sliding guide mechanism includes fixed guide bars, rolling wheels, rotating shaft rods and support rods. Multiple fixed guide bars are laid horizontally on the roadbed surface, and multiple fixed guide bars are provided with guide grooves. The lower surface of the mounting seat is symmetrically rotatably provided with rotating shaft rods, and rolling wheels are installed at both end surfaces of the symmetrical rotating shaft rods. The two symmetrical rotating shaft rods are connected to each other through pulleys and belts. The rolling wheels on the left and right sides of the mounting seat are in rotational contact with the guide grooves. The top surface of the mounting seat is fixed with a support rod, and the upper end surface of the support rod supports a signal receiver.

[0007] Furthermore, a horizontal positioning assembly is provided in the guide groove, and the horizontal positioning assembly includes a positioning support rod, a horizontal ball, an electric push rod, a positioning sleeve and a snap cap. A positioning support groove is provided below the guide groove, and a plurality of positioning support rods are vertically fixed in the positioning support groove. A horizontal ball is installed on the top surface of the positioning support rod, a hidden cavity is provided inside the lower surface of the mounting seat, and an electric push rod is vertically fixed in the hidden cavity, a positioning sleeve is fixed on the end face of the piston rod of the electric push rod, and a snap cap is provided inside the positioning sleeve. The positioning sleeve is slidably sleeved on the positioning support rod under the push of the piston rod of the electric push rod, and the snap cap is slidably sleeved on the horizontal ball.

[0008] Furthermore, the sliding guide mechanism also includes a rubber membrane and a T-shaped slide bar. A sealing slide groove is opened above the two side walls of the guide slide groove, and two sections of rubber membranes are slidably arranged in the sealing slide groove, and the two sections of rubber membranes are located on both sides of the mounting seat. One end face of each section of the rubber membrane is fixed to the end of the fixed guide bar, and the other end face of each section of the rubber membrane is connected to the T-shaped slide bar. T-shaped slide grooves are vertically opened on the left and right side surfaces of the mounting seat, and T-shaped slide bars are slidably arranged in the T-shaped slide grooves.

[0009] Furthermore, a limiting horizontal bar is installed on the end surface where the rubber membrane is connected to the T-shaped slide bar, and the two ends of the limiting horizontal bar slide and fit in the sealing slide groove opened on the two side walls. The limiting horizontal bar is located on the end surface of the sealing slide groove and is rolled with rubber balls, and the rubber balls are in rolling friction contact with the sealing slide groove.

[0010] Furthermore, an elastic wear-resistant layer is provided on the inner wall of the positioning sleeve, and the inner wall surface of the elastic wear-resistant layer is coated with talcum powder.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The design of the present invention is to slide the mounting base onto the roadbed surface on one side of the bridge pier through a sliding guide mechanism, and detachably fix a plurality of fixed guide bars on the roadbed surface, and then put the mounting base with a rolling wheel into the guide slide groove opened on the upper surface of the fixed guide bar, and the rotating shaft rod will drive the mounting base to slide along the length direction of the fixed guide bar through the rolling wheel. When the signal receiver is aligned with the signal generator on the side of the bridge pier through the movement of the mounting base, the driving motor is controlled to stop rotating, and then the electrical signal emitted by the signal generator will be received by the signal receiver, and then the mounting base drives the signal receiver to move to the corresponding position of the next bridge pier and stop, so that it can transmit data with the signal generator installed on the bridge pier, and then the mounting base continuously moves at a fixed point on the fixed guide bar, so that a single signal receiver can transmit corresponding signals with each signal generator on multiple bridge piers, thereby facilitating rapid and accurate settlement displacement monitoring of multiple bridge piers.

[0013] When the guide rail is in the upright position, the guide rail is moved in a direction of rotation so that the guide rail is moved in a horizontal direction and the horizontal position of the guide rail is adjusted accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the mounting base of the present invention;

[0016] Figure 3 is a cross-sectional view of the mounting base of the present invention;

[0017] Figure 4 It is a cross-sectional view of the fixed guide bar of the present invention.

[0018] In the figure: 1. Signal receiver; 2. Mounting seat; 21. Hidden cavity; 22. T-shaped slide; 3. Sliding guide mechanism; 31. Fixed guide bar; 311. Guide slide; 312. Positioning support groove; 313. Sealing slide; 32. Rolling wheel; 33. Rotating shaft rod; 34. Support rod; 35. Rubber membrane; 36. T-shaped slide; 4. Horizontal positioning assembly; 41. Positioning support rod; 42. Horizontal ball; 43. Electric push rod; 44. Positioning sleeve; 45. Engaging cap; 5. Limiting horizontal bar; 6. Elastic wear-resistant layer. DETAILED DESCRIPTION

[0019] 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.

[0020] Example 1:

[0021] like Figures 1 to 4As shown, the present invention provides a technical solution for monitoring the settlement displacement of a bridge pier under a subway shield tunnel: it includes a signal receiver 1 and a mounting base 2, the upper end surface of the mounting base 2 is fixed with the signal receiver 1, and the mounting base 2 slides on the roadbed surfaces on both sides of the bridge pier through a sliding guide mechanism 3, so that the signal receiver 1 can slide horizontally on the roadbed surface to receive signals from signal generators respectively fixed on multiple bridge piers above the subway shield tunnel passing under, thereby facilitating sliding fixed-point settlement displacement monitoring of multiple bridge wheels; therefore, the present invention is designed to fix the sliding guide mechanism 3 on the roadbed surface on one side of multiple bridge piers, so that when it is necessary to monitor the settlement displacement of the bridge pier, the construction personnel can place the mounting base 2 horizontally on the sliding guide mechanism 3, and then drive the mounting base 2 to slide on the roadbed surface through the sliding guide mechanism 3, and then when the mounting base 2 drives the signal receiver 1 to slide to the side of the corresponding bridge pier, the signal receiver 1 will receive the signal from the signal generator on the side bone of the bridge pier. Then the signal receiver 1 will feed the electrical signal back to the computer. At this time, the computer will calculate and analyze the data at the bridge pier and record it with a number. Then the sliding guide mechanism 3 will continue to drive the mounting seat 2 to move, so that the signal receiver 1 will slide to the side of the next bridge pier at a fixed point, and then receive the electrical signal emitted by the next signal generator. Then the computer will perform calculations, and then the sliding guide mechanism 3 will drive the mounting seat 2 to continuously slide at a fixed point on the roadbed surface, so that the signal receiver 1 can receive the electrical signals generated by the signal generators fixed on different bridge piers. When a bridge settles, the height signal emitted by the signal generator at that location received by the signal receiver 1 driven by the sliding guide mechanism 3 will change, that is, the height difference between the signal generator and the signal receiver 1 will change, which will facilitate the monitoring of the settlement displacement generated by different bridge piers, thereby improving the efficiency and accuracy of the monitoring equipment in monitoring the settlement displacement of multiple bridge piers above the subway shield tunnel.

[0022] As an embodiment of the present invention, the sliding guide mechanism 3 includes a fixed guide bar 31, a rolling wheel 32, a rotating shaft rod 33 and a support rod 34. A plurality of the fixed guide bars 31 are horizontally laid on the roadbed surface, and a plurality of the fixed guide bars 31 are provided with a guide groove 311. The lower surface of the mounting seat 2 is symmetrically provided with a rotating shaft rod 33, and the two end surfaces of the symmetrical rotating shaft rod 33 are installed with a rolling wheel 32. The two symmetrical rotating shaft rods 33 are connected to each other through a pulley and a belt. The rolling wheels 32 on the left and right sides of the mounting seat 2 are in rotational contact with the guide groove 311. The top surface of the mounting seat 2 is fixed with a support rod 34, and the upper end surface of the support rod 34 supports the signal receiver 1; according to the design of the present invention, when the mounting seat 2 is needed to drive the signal receiver 1 to move on the roadbed surface, the construction workers need to level the roadbed surface first, and then detachably fix multiple fixed guide bars 31 on the roadbed surface according to the total length of multiple bridge piers, and then put the mounting seat 2 with the rolling wheel 32 into the guide groove 311 provided on the upper surface of the fixed guide bar 31, so that the wheel rim surface of the rolling wheel 32 contacts the guide groove 311, and then the signal receiver 1 is moved along the roadbed surface. The mounting base 2 is supported by the support rod 34. When the mounting base 2 needs to move on the fixed guide bar 31, the drive motor in the mounting base 2 is controlled to work, so that it drives the pulley to rotate through the output shaft, and then drives the two rotating shafts 33 to rotate through the belt, and then the rotating shaft 33 will drive the mounting base 2 to slide along the length direction of the fixed guide bar 31 through the rolling wheel 32. When the signal receiver 1 is aligned with the signal generator on the side of the bridge pier through the movement of the mounting base 2, the drive motor is controlled to stop rotating. Then the electrical signal emitted by the signal generator will be received by the signal receiver 1 and transmitted to the computer for data analysis and calculation. When the computer completes the analysis of the data generated by the bridge pier, the construction personnel continue to control the drive motor to work, so that the mounting base 2 drives the signal receiver 1 to move to the position corresponding to the next bridge pier and stop, so that it can transmit data with the signal generator installed on the bridge pier. Then, through the continuous fixed-point movement of the mounting base 2 on the fixed guide bar 31, a single signal receiver 1 can transmit corresponding signals to each signal generator on multiple bridge piers, thereby facilitating the rapid and accurate monitoring of the settlement displacement of multiple bridge piers.

[0023] As an embodiment of the present invention, a horizontal positioning component 4 is provided in the guide slot 311, and the horizontal positioning component 4 includes a positioning support rod 41, a horizontal ball 42, an electric push rod 43, a positioning sleeve 44 and a locking cap 45. A positioning support groove 312 is provided below the guide slot 311, and a plurality of positioning support rods 41 are vertically fixed in the positioning support groove 312. A horizontal ball 42 is installed on the top surface of the positioning support rod 41. A hidden cavity 21 is provided inside the lower surface of the mounting seat 2, and an electric push rod 43 is vertically fixed in the hidden cavity 21. A positioning sleeve 44 is fixed to the piston rod end surface of the electric push rod 43, and the positioning sleeve 44 is fixed to the piston rod end surface of the electric push rod 43. The interior of the positioning sleeve 44 is provided with a snap-fitting cap 45, and the positioning sleeve 44 is slidably sleeved on the positioning support rod 41 under the push of the piston rod of the electric push rod 43, and the snap-fitting cap 45 is slidably sleeved on the leveling ball 42; the present invention is designed to further improve the accuracy of the electrical signal that the signal receiver 1 can receive from the signal generator. Therefore, when the fixed guide bar 31 is fixed to the roadbed surface, the construction personnel fix multiple positioning support rods 41 in the positioning support grooves 312 opened on the fixed guide bar 31, and at the same time, it is necessary to use a level meter to measure that the upper end surfaces of the multiple positioning support rods 41 are at the same horizontal height, and then use the positioning support rods 41 to adjust the height of the positioning support rods 41. The horizontal ball 42 on the upper end surface is used as a reference point, and each positioning support rod 41 needs to be accurately aligned with the signal generator installed on the side of the bridge pier. Therefore, when the mounting seat 2 slides on the fixed guide bar 31 to be aligned with the bridge pier, the construction personnel control the piston rod of the electric push rod 43 installed in the mounting seat 2 to extend, so that it drives the positioning sleeve 44 to extend from the bottom end surface of the mounting seat 2, and the positioning sleeve 44 will extend downward and be sleeved on the positioning support rod 41. At the same time, the support of the positioning support rod 41 on the positioning sleeve 44 will cause the rolling wheel 32 to disengage from the guide groove 311. At the same time, when the positioning sleeve 44 is sleeved on the positioning support rod 41, at this time The engaging cap 45 in the positioning sleeve 44 will be synchronously sleeved on the horizontal ball 42, and the horizontal ball 42 serves as the horizontal base point of the positioning support rod 41. The mounting base 2 horizontally supported by the positioning support rod 41 can improve the horizontal accuracy of the signal receiver 1 in the fixed guide bar 31, thereby facilitating the signal receiver 1 to accurately and stably receive the electrical signal sent by the signal generator. It can effectively prevent the falling of debris or gravel into the guide groove 311 inside the fixed guide bar 31, thereby affecting the horizontal accuracy of the mounting base 2 in the fixed guide bar 31, thereby affecting the accurate monitoring of the settlement displacement of the bridge pier by the signal receiver 1 and the signal generator;After the signal receiver 1 on the upper end face of the mounting seat 2 receives the electrical signal sent by the signal generator on the bridge pier, the rolling wheel 32 is required to drive the mounting seat 2 to continue moving to the next bridge pier. Then, the construction personnel will control the piston rod of the electric push rod 43 to retract, so that it drives the rolling wheel 32 to contact the guide slide 311 first, and then continue to drive the positioning sleeve 44 to disengage from the positioning support rod 41, so that the positioning sleeve 44 can rise into the hidden cavity 21 for hiding. Then, the construction personnel control the rolling wheel 32 to continue rotating, so that it drives the signal receiver 1 to move to the position corresponding to the next bridge pier through the mounting seat 2, and then repeatedly pushes out the positioning sleeve 44 and sleeves it on the positioning support rod 41, thereby facilitating the mounting seat 2 to be lifted upward and horizontally, so that the signal receiver 1 can accurately and stably receive the electrical signal sent by the signal generator, thereby improving the monitoring equipment's ability to accurately monitor the settlement displacement of multiple bridge piers above the subway shield tunnel.

[0024] As an embodiment of the present invention, the sliding guide mechanism 3 further includes a rubber membrane 35 and a T-shaped slide 36. A sealing slide 313 is provided above the two side walls of the guide slide 311, and two sections of rubber membranes 35 are slidingly provided in the sealing slide 313. The two sections of rubber membranes 35 are located on both sides of the mounting seat 2. One end face of each section of the rubber membrane 35 is fixed to the end of the fixed guide bar 31, and the other end face of each section of the rubber membrane 35 is connected to the T-shaped slide 36. The left and right sides of the mounting seat 2 are vertically provided with T-shaped slides. The present invention is to provide a T-shaped slide groove 22, and a T-shaped slide bar 36 is provided for sliding in the T-shaped slide groove 22; the rubber membrane 35 of the present invention has a certain ductility and high resilience, when the mounting seat 2 slides in the guide slide groove 311, in order to prevent dust on the roadbed surface from falling into the guide slide groove 311, thereby affecting the normal and stable sliding of the rolling wheel 32 in the guide slide groove 311, the present invention provides a rubber membrane 35 in the sealing slide groove 313 on both side walls of the guide slide groove 311, so that the rubber membrane 35 can completely seal the guide slide The groove 311 is covered, so when the mounting seat 2 moves forward in the guide groove 311, the rubber membrane 35 on one side of the moving direction of the mounting seat 2 will elastically shrink due to its own resilience, while the rubber membrane 35 on the other side of the mounting seat 2 will be stretched due to its good ductility, and the rubber membrane 35 is slidably connected to the T-shaped groove 22 opened on the side of the mounting seat 2 through the T-shaped slide 36. Therefore, when the mounting seat 2 is pushed by the piston rod of the electric push rod 43, the rolling wheel 32 moves from the guide groove 3 When the mounting seat 2 slides upward in the guide slot, the T-shaped slide bar 36 will slide downward in the T-shaped slot 22. When the mounting seat 2 drives the rolling wheel 32 to descend into the guide slot, the T-shaped slide bar 36 will fit into the top surface of the T-shaped slot 22, so that when the mounting seat 2 slides up and down in the guide slot, it will not affect the safe and stable sealing of the guide slot by the rubber membrane 35, and will not cause the gravel or soil dust splashed on the roadbed surface to fall into the guide slot, thereby affecting the stable and safe sliding of the rolling wheel 32 in the guide slot.

[0025] When the cam 314 is in the closed position, the stopper 313 is engaged with the stopper 316, and the stopper 317 is engaged with the stopper 318. When the cam 314 is in the closed position, the stopper 318 is engaged with the stopper 319. When the cam 314 is in the closed position, the stopper 318 is engaged with the stopper 319. The effect of the pressing and positioning is that when the mounting seat 2 slides upward, the T-shaped slide bar 36 will only slide in the T-shaped slide groove 22, and the friction force between the T-shaped slide bar 36 and the T-shaped slide groove 22 will not be too great, causing the T-shaped slide bar 36 to slide upward synchronously with the mounting seat 2, which will easily cause the rubber membrane 35 to separate from the sealing slide groove 313, which will affect the sealing effect of the rubber membrane 35 on the guide slide groove 311; and the rolling contact between the limiting horizontal bar 5 and the sealing slide groove 313 through the rubber ball can reduce the friction force when the limiting horizontal bar 5 slides in the sealing slide groove 313. At the same time, when the mounting seat 2 slides upward in the guide slide groove 311, the friction force between the T-shaped slide bar 36 and the T-shaped slide groove 22 will inevitably generate an upward pulling force on the limiting horizontal bar 5, and then the rubber ball can play an elastic squeezing and buffering role on the limiting horizontal bar 5 and the upper side wall of the sealing slide groove 313.

[0026] As an embodiment of the present invention, the inner wall of the positioning sleeve 44 is provided with an elastic wear-resistant layer 6, and the inner wall surface of the elastic wear-resistant layer 6 is coated with talcum powder; according to the design of the present invention, when the positioning sleeve 44 is pushed by the piston rod of the electric push rod 43 and is sleeved on different positioning support rods 41, the elastic wear-resistant layer 6 and the talcum powder coated on the inner wall of the positioning sleeve 44 can reduce the degree of wear of the positioning sleeve 44 when it is frequently sleeved on the positioning support rod 41, thereby increasing the service life of the positioning sleeve 44.

[0027] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A settling displacement monitoring device for a subway shield tunnel passing under a bridge pier, comprising a signal receiver (1) and a mounting base (2), characterized in that: A signal receiver (1) is fixed to the upper end surface of the mounting seat (2), and the mounting seat (2) slides on the roadbed surfaces on both sides of the bridge pier through a sliding guide mechanism (3), thereby facilitating the signal receiver (1) to slide horizontally on the roadbed surface to receive signals from signal generators respectively fixed on multiple bridge piers above the subway shield tunnel passing through, thereby facilitating sliding fixed-point settlement displacement monitoring of multiple bridge wheels; The sliding guide mechanism (3) includes a fixed guide bar (31), a rolling wheel (32), a rotating shaft rod (33) and a support rod (34). A plurality of the fixed guide bars (31) are horizontally laid on the roadbed surface, and a guide slot (311) is provided in each of the plurality of fixed guide bars (31). The lower surface of the mounting seat (2) is symmetrically provided with a rotating shaft rod (33), and rolling wheels (32) are installed on both end surfaces of the symmetrical rotating shaft rod (33). The two symmetrical rotating shaft rods (33) are connected to each other through a pulley and a belt. The rolling wheels (32) on the left and right sides of the mounting seat (2) are in rotational contact with the guide slot (311). The top surface of the mounting seat (2) is fixed with a support rod (34), and the upper end surface of the support rod (34) supports a signal receiver (1). A horizontal positioning assembly (4) is provided in the guide chute (311), and the horizontal positioning assembly (4) includes a positioning support rod (41), a horizontal ball (42), an electric push rod (43), a positioning sleeve (44) and a locking cap (45). A positioning support groove (312) is provided below the guide chute (311), and a plurality of positioning support rods (41) are vertically fixed in the positioning support groove (312). The top surface of the positioning support rod (41) is equipped with a horizontal ball (42). A hidden cavity (21) is provided inside the lower surface of the mounting seat (2), and an electric push rod (43) is vertically fixed in the hidden cavity (21). A positioning sleeve (44) is fixed to the piston rod end face of the electric push rod (43), and a snap-fitting cap (45) is provided inside the positioning sleeve (44). The positioning sleeve (44) is slidably sleeved on the positioning support rod (41) under the push of the piston rod of the electric push rod (43), and the snap-fitting cap (45) is slidably sleeved on the horizontal ball (42); The sliding guide mechanism (3) further comprises a rubber film (35) and a T-shaped slide bar (36). A sealing slide bar (313) is provided above the two side walls of the guide slide bar (311), and two sections of rubber films (35) are slidably provided in the sealing slide bar (313). The two sections of rubber films (35) are located on both sides of the mounting seat (2). One end face of each section of the rubber film (35) is fixed to the end of the fixed guide bar (31), and the other end face of each section of the rubber film (35) is connected to the T-shaped slide bar (36). The left and right side surfaces of the mounting seat (2) are vertically provided with T-shaped slide bars (22), and the T-shaped slide bars (36) are slidably provided in the T-shaped slide bars (22).

2. The settlement and displacement monitoring device for a subway shield tunnel passing under a bridge pier according to claim 1, characterized in that: The end surface where the rubber membrane (35) is connected to the T-shaped slide bar (36) is installed with a limit bar (5), and the two ends of the limit bar (5) are slidably fitted in the sealing slide groove (313) opened on the two side walls. The end surface of the limit bar (5) located in the sealing slide groove (313) is rolled with a rubber ball, and the rubber ball is in rolling friction contact with the sealing slide groove (313).

3. The settlement and displacement monitoring device for a subway shield tunnel passing under a bridge pier according to claim 1, characterized in that: The inner wall of the positioning sleeve (44) is provided with an elastic wear-resistant layer (6), and the inner wall surface of the elastic wear-resistant layer (6) is coated with talcum powder.

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