A bridge active fault monitoring device

Abstract

The present invention relates to the field of bridge monitoring, and specifically discloses a bridge active fault monitoring device, which includes a bearing platform, a bridge body arranged on the bearing platform, and a telescopic gap arranged between two adjacent bridge bodies. A displacement monitoring mechanism is arranged in the telescopic gap, and the displacement monitoring mechanism includes a first monitoring mechanism for monitoring the displacement parallel to the axial direction of the bridge and a second monitoring mechanism for monitoring the displacement perpendicular to the axial direction of the bridge. For this bridge active fault monitoring device, by setting the displacement monitoring mechanism including the first monitoring mechanism for monitoring the displacement parallel to the axial direction of the bridge and the second monitoring mechanism for monitoring the displacement perpendicular to the axial direction of the bridge, the displacement changes of the bridge body in any direction can be monitored in real time, that is, the telescopic changes of the bridge body caused by daily loads, temperature, etc. can be monitored, and the abnormal influence on the bridge body when the active fault occurs can also be monitored, which is convenient for timely response.

Description

Technical Field

[0001] The present invention relates to the field of bridge monitoring, and particularly to a bridge active fault monitoring device. Background Art

[0002] A bridge expansion joint is a gap provided in the upper structure of a bridge to accommodate the expansion and contraction deformation of materials. Its function is to adjust the displacement between the upper structures caused by factors such as external temperature changes, creep of concrete, and drying shrinkage. At the same time, it directly bears the repeated impact of wheel loads. It is the part of the bridge structure that is most vulnerable to damage. Once damaged, the joint will sink, the road surface at the connection will be damaged, resulting in steps of different heights, causing the passing vehicles to jolt, making the passengers in the vehicle feel uncomfortable, and even triggering traffic accidents, affecting the normal operation of the bridge. Therefore, monitoring the bridge expansion joint is an important measure to ensure the safety of the bridge structure and the passing experience.

[0003] In Chinese Patent Publication No.: CN211626543U, a bridge large-displacement expansion joint structure monitoring device is disclosed, including a support plate. A support column is fixedly connected to the middle of the upper surface of the support plate. A cavity is provided inside the support column, and an inverter is fixedly connected to the front side of the inner bottom side wall of the support column.

[0004] In the above-mentioned prior art, a pressure sensor and a spring are provided to cooperate with each other to achieve monitoring. Although the changes in the expansion joint can be monitored in real time, its monitoring orientation has limitations. Generally, it can only monitor the changes occurring in the axial direction parallel to the bridge. Moreover, the pressure sensor can only achieve monitoring when the expansion joint becomes narrower, and it cannot effectively monitor the changes in the axial direction perpendicular to the bridge and the situation where the expansion joint becomes wider. In particular, it cannot effectively monitor the impact on the bridge caused by the displacement change of the active fault. An active fault is a common geological structure in the earth's crust, and its displacement may cause the overall deformation or damage of the bridge structure. The active fault will not only affect the displacement change in the axial direction parallel to the bridge, but also affect the displacement change in the axial direction perpendicular to the bridge. Therefore, in order to more comprehensively evaluate the safety and stability of the bridge structure, it is necessary to develop a monitoring device that can simultaneously monitor the changes in the bridge expansion joint caused by various factors.

[0005] Therefore, it is very necessary to propose a bridge active fault monitoring device to solve the above problems. Summary of the Invention

[0006] The main purpose of the present invention is to provide a bridge active fault monitoring device, which can effectively solve the problems in the background art.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] A bridge active fault monitoring device includes a bearing platform, a bridge body disposed on the bearing platform, and a telescopic gap disposed between two adjacent bridge bodies. A displacement monitoring mechanism is disposed in the telescopic gap. The displacement monitoring mechanism includes a first monitoring mechanism for monitoring displacement parallel to the axial direction of the bridge and a second monitoring mechanism for monitoring displacement perpendicular to the axial direction of the bridge.

[0009] The first monitoring mechanism includes a first monitoring shell disposed inside the telescopic gap and fixed on the bearing platform. A lifting frame is vertically movably connected inside the first monitoring shell. A first pressing head is disposed at the bottom of the lifting frame. A first elastic member is disposed between the top of the first pressing head and the bottom of the lifting frame. A first pressure sensor fixed on the bearing platform is disposed directly below the first pressing head. Slopes are disposed on two opposite sides of the upper end of the lifting frame along the width direction of the telescopic gap. A driving arm is movably connected along the width direction of the telescopic gap at the corresponding position between the side wall of the first monitoring shell and the slope. One end of the driving arm extends to the inside of the first monitoring shell, and a notch in the shape of an isosceles trapezoid corresponding to the slope is disposed at the bottom of the end extending to the inside of the first monitoring shell. The slope is in mating engagement with the inner wall slope of the notch, so that when the driving arm displaces along the width direction of the telescopic gap, the lifting frame longitudinally displaces.

[0010] The second monitoring mechanism is disposed on the end side wall of the bridge body. The second monitoring mechanism includes a fixing plate fixedly disposed on the end side wall of the bridge body. An installation groove corresponding to the first monitoring shell is disposed on the side of the fixing plate away from the bridge body. A second pressure sensor is disposed inside the installation groove. A second monitoring shell in the shape of a circle corresponding to the installation groove is fixedly disposed on the side of the fixing plate away from the bridge body. A through hole is disposed on the side of the second monitoring shell away from the fixing plate. A driving rod with a diameter smaller than the inner diameter of the through hole is movably inserted through the through hole. An activity disk in the shape of a ring and movably connected to the inside of the second monitoring shell is fixedly disposed on the outer side of the end of the driving rod extending to the inside of the second monitoring shell. Third elastic members are uniformly disposed between the circumferential side wall of the activity disk and the inner wall of the second monitoring shell. A driving groove in the shape of a cone is disposed at one end of the driving rod close to the activity disk. A force-bearing head in the shape of a cone is movably connected to the driving groove. One end of the force-bearing head away from the driving rod is movably connected to the installation groove and corresponds to the second pressure sensor. A second pressing head is disposed at one end of the force-bearing head close to the second pressure sensor. A fourth elastic member is disposed between the second pressing head and the force-bearing head. A pulling plate corresponding to the driving arm is fixedly disposed at the end of the driving rod away from the activity disk. One side of the pulling plate away from the driving rod is fixedly connected to the end of the driving arm.

[0011] Preferably, the bottom of the first monitoring shell is open, and the lifting frame corresponds to the opening.

[0012] The lifting frame is in the shape of a "mouth", and the slopes are disposed on the inner and outer sides of the opposite sides of the upper end of the lifting frame.

[0013] Preferably, the outer diameter of the movable disk is larger than the inner diameter of the mounting groove, and the movable disk is displaced along a direction perpendicular to the axial direction of the second monitoring shell inside the second monitoring shell.

[0014] Preferably, a bracket is fixedly arranged at the end of the bottom of the first monitoring shell, and the lower end of the bracket is fixedly arranged on the base.

[0015] Preferably, a reset assembly for resetting the lifting frame is arranged on the first monitoring mechanism. The reset assembly includes a groove arranged at the end of the lifting frame. A pin is vertically movably connected to the upper end of the groove, and the top of the pin is fixedly connected to the top wall of the inner cavity of the first monitoring shell. A second elastic member is arranged between the lower end of the pin and the upper end of the inner side of the groove, and is configured to contract when the lifting frame is displaced downward.

[0016] Preferably, the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member are springs.

[0017] Preferably, a cleaning assembly is further included. The cleaning assembly includes a transverse moving plate movably connected to the side wall of the first monitoring shell along the length direction of the telescopic gap. A through groove is vertically penetrated at one end of the transverse moving plate. A longitudinal moving plate is vertically movably connected to the through groove. A connecting plate is horizontally arranged at the top of the longitudinal moving plate. Cleaning sheets are uniformly arranged at the bottom of the connecting plate. A first guide groove is arranged at the top of one end of the transverse moving plate. A first roller movably connected to the first guide groove is arranged at the bottom of the pulling plate. A side plate corresponding to the longitudinal moving plate is arranged at the bottom of the first monitoring shell. A second guide groove is obliquely arranged at one end of the side plate. A third guide groove is horizontally arranged at the lower end of the second guide groove. A second roller for movably connecting to the second guide groove and the third guide groove is arranged on the side of the longitudinal moving plate close to the side plate.

[0018] Preferably, the first roller and the first guide groove are configured such that when the pulling plate drives the first roller to displace towards the first monitoring shell, the transverse moving plate displaces towards the end of the telescopic gap.

[0019] The second roller and the second guide groove are configured such that when the transverse moving plate drives the longitudinal moving plate to displace towards the end of the telescopic gap, the longitudinal moving plate simultaneously displaces downward, and when the second roller enters the inner side of the third guide groove, the bottom of the cleaning sheet contacts the bottom wall of the telescopic gap.

[0020] Preferably, the first roller is rotatably connected to the bottom of the pulling plate;

[0021] The second roller is rotatably connected to the side wall of the longitudinal moving plate.

[0022] Preferably, a guide rail corresponding to the transverse moving plate is arranged on the side wall of the first monitoring shell, and the transverse moving plate is movably and guidingly connected to the guide rail.

[0023] Compared with the prior art, the present invention provides a bridge active fault monitoring device, which has the following beneficial effects:

[0024] The bridge active fault monitoring device, through the displacement monitoring mechanism provided, includes a first monitoring mechanism for monitoring the axial displacement parallel to the bridge and a second monitoring mechanism for monitoring the axial displacement perpendicular to the bridge. It can monitor the displacement changes of the bridge body in any direction in real time, and can monitor the daily expansion and contraction changes of the bridge body caused by load, temperature and the like, and can also monitor the abnormal impact of the active fault on the bridge body when displacement occurs, so as to facilitate timely response and comprehensive evaluation of the safety and stability of the bridge structure. Moreover, the first monitoring mechanism and the second monitoring mechanism are arranged in one piece and do not affect each other, and the structure is compact and easy to use.

[0025] The bridge active fault monitoring device, through the linkage arrangement of the cleaning component and the first monitoring mechanism, can clean the expansion gap when the bridge body expands and contracts due to the influence of temperature, load, etc. on a daily basis, thereby reducing the accumulation of debris and avoiding affecting the use of the expansion gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the overall structure of the displacement monitoring mechanism and the cleaning component of the present invention;

[0028] Figure 3 The present invention Figure 2 Schematic diagram of the structure when the foundation is disassembled;

[0029] Figure 4 It is a schematic diagram of the structure of the first monitoring shell, the first pressure sensor, and the lifting frame of the present invention in a disassembled state;

[0030] Figure 5 The present invention Figure 4 A structural diagram from another perspective based on the above;

[0031] Figure 6 It is a schematic diagram of the structure of the driving arm, lifting frame and reset assembly of the present invention in a disassembled state;

[0032] Figure 7 It is a schematic diagram of the overall structure of the fixing plate and the second monitoring shell of the present invention;

[0033] Figure 8 It is a schematic diagram of the structure of the second monitoring mechanism and the fixing plate of the present invention in a disassembled state;

[0034] Figure 9 The present invention Figure 8 A structural diagram from another perspective based on the above;

[0035] Figure 10 It is a schematic structural diagram of the first monitoring shell, the pulling plate and the cleaning component on one side of the present invention in a cooperative state;

[0036] Figure 11 It is a schematic structural diagram of the cleaning component of the present invention in a disassembled state.

[0037] In the figure: 1, bearing platform; 2, bridge body; 3, expansion joint; 4, fixing plate; 5, first monitoring shell; 6, connecting plate; 7, second monitoring shell; 8, bracket; 9, cleaning piece; 10, transverse moving plate; 11, pulling plate; 12, driving rod; 13, first pressure sensor; 14, driving arm; 15, lifting frame; 16, first pressing head; 17, first elastic member; 18, pin; 19, second elastic member; 20, slope; 21, notch; 22, groove; 23, through hole; 24, installation groove; 25, second pressure sensor; 26, force receiving head; 27, movable disk; 28, third elastic member; 29, driving groove; 30, second pressing head; 31, fourth elastic member; 32, longitudinal moving plate; 33, side plate; 34, guide rail; 35, first roller; 36, through slot; 37, first guide slot; 38, second roller; 39, second guide slot; 40, third guide slot. Specific embodiments

[0038] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0039] Such as Figures 1-6As shown in the figure, a bridge active fault monitoring device includes a bearing platform 1, a bridge body 2 arranged on the bearing platform 1, and a telescopic gap 3 arranged between two adjacent bridge bodies 2. A displacement monitoring mechanism is arranged in the telescopic gap 3. The displacement monitoring mechanism includes a first monitoring mechanism for monitoring the displacement parallel to the bridge axis and a second monitoring mechanism for monitoring the displacement perpendicular to the bridge axis. As a preferred embodiment, the first monitoring mechanism includes a first monitoring shell 5 arranged inside the telescopic gap 3 and fixed on the bearing platform 1. A bracket 8 is fixedly arranged at the end of the bottom of the first monitoring shell 5. The lower end of the bracket 8 is fixed on the bearing platform 1 by bolts. A lifting frame 15 is vertically movably connected inside the first monitoring shell 5. The bottom of the first monitoring shell 5 is open, and the lifting frame 15 corresponds to the opening. A first pressing head 16 is arranged at the bottom of the lifting frame 15. A first elastic member 17 is arranged between the top of the first pressing head 16 and the bottom of the lifting frame 15. The first elastic member 17 is preferably a spring. A first pressure sensor 13 fixed on the bearing platform 1 is arranged directly below the first pressing head 16. Slopes 20 are arranged on two opposite sides of the upper end of the lifting frame 15 along the width direction of the telescopic gap 3. Specifically, the lifting frame 15 is in a "mouth" shape, and the slopes 20 are arranged on the inner and outer sides of the opposite sides of the upper end of the lifting frame 15. A driving arm 14 is movably connected along the width direction of the telescopic gap 3 at the corresponding position of the side wall of the first monitoring shell 5 and the slope 20. One end of the driving arm 14 extends to the inside of the first monitoring shell 5, and a notch 21 corresponding to the slope 20 and in an isosceles trapezoid shape is arranged at the bottom of the end extending to the inside of the first monitoring shell 5. The slope 20 is in cooperation with the inner wall slope of the notch 21, so that when the driving arm 14 displaces along the width direction of the telescopic gap 3, the lifting frame 15 longitudinally displaces;

[0040] As Figure 6 shown, for the convenience of resetting the lifting frame 15, a reset assembly for resetting the lifting frame 15 is arranged on the first monitoring mechanism. The reset assembly includes a groove 22 arranged at the end of the lifting frame 15. A pin 18 is vertically movably connected to the upper end of the groove 22. The cross section of the pin 18 is in a "T" shape, and the top of the pin 18 is fixedly connected to the inner cavity top wall of the first monitoring shell 5. A second elastic member 19 is arranged between the lower end of the pin 18 and the upper end of the inside of the groove 22. The second elastic member 19 is preferably a spring. The spring is sleeved on the outside of the lower end of the pin 18 and is configured to contract the second elastic member 19 when the lifting frame 15 displaces downward;

[0041] As Figures 1-3 、 Figures 7-9As shown, as a preferred embodiment, the second monitoring mechanism is arranged on the end side wall of the bridge body 2. The second monitoring mechanism includes a fixing plate 4 fixedly arranged on the end side wall of the bridge body 2 by bolts. On the side of the fixing plate 4 away from the bridge body 2, there is an installation groove 24 corresponding to the first monitoring shell 5. Inside the installation groove 24, there is a second pressure sensor 25. On the side of the fixing plate 4 away from the bridge body 2, a circular second monitoring shell 7 corresponding to the installation groove 24 is fixedly arranged. On the side of the second monitoring shell 7 away from the fixing plate 4, there is a through hole 23. A driving rod 12 with a diameter smaller than the inner diameter of the through hole 23 is movably inserted through the through hole 23. On the outer side of the end of the driving rod 12 extending into the inner side of the second monitoring shell 7, there is an annular movable disk 27 which is movably connected to the inner side of the second monitoring shell 7. The movable disk 27 can only displace along the direction perpendicular to the axial direction of the second monitoring shell 7 inside the second monitoring shell 7. The outer diameter of the movable disk 27 is larger than the inner diameter of the installation groove 24. Between the circumferential side wall of the movable disk 27 and the inner wall of the second monitoring shell 7, third elastic members 28 are evenly arranged. The third elastic members 28 are preferably springs. At one end of the driving rod 12 close to the movable disk 27, there is a conical driving groove 29. The driving groove 29 is movably connected to a conical force receiving head 26. The force receiving head 26 matches the driving groove 29. Thus, when the movable disk 27 displaces along the direction perpendicular to the axial direction of the second monitoring shell 7, the force receiving head 26 is extruded to displace in the direction away from the driving rod 12. One end of the force receiving head 26 away from the driving rod 12 is movably connected to the installation groove 24 and corresponds to the second pressure sensor 25. At one end of the force receiving head 26 close to the second pressure sensor 25, there is a second pressing head 30. Between the second pressing head 30 and the force receiving head 26, there is a fourth elastic member 31. The fourth elastic member 31 is preferably a spring. At the end of the driving rod 12 away from the movable disk 27, there is a pulling plate 11 corresponding to the driving arm 14. On the side of the pulling plate 11 away from the driving rod 12, it is fixedly connected to the end of the driving arm 14.

[0042] In addition, as Figures 1-3 , Figures 10-11As shown in the figure, in order to clean the inner side of the telescopic gap 3, a cleaning component is provided. As a preferred embodiment, the cleaning component includes a transverse movement plate 10 movably connected to the side wall of the first monitoring shell 5 along the length direction of the telescopic gap 3. Specifically, a guide rail 34 corresponding to the transverse movement plate 10 is provided on the side wall of the first monitoring shell 5. Moreover, the transverse movement plate 10 is located on the side of the first monitoring shell 5 facing the bridge body 2, and two transverse movement plates 10 are symmetrically arranged at both ends of the side of the first monitoring shell 5 facing the bridge body 2. The transverse movement plate 10 is movably and guidingly connected to the guide rail 34. A through groove 36 is vertically provided through one end of the transverse movement plate 10, and a longitudinal movement plate 32 is vertically movably connected to the through groove 36. A connecting plate 6 is horizontally arranged at the top of the longitudinal movement plate 32, and cleaning pieces 9 are uniformly arranged at the bottom of the connecting plate 6. A first guide groove 37 is provided at the top of one end of the transverse movement plate 10, and the two first guide grooves 37 on the same side of the first monitoring shell 5 are in an "eight" shape. A first roller 35 movably connected to the first guide groove 37 is provided at the bottom of the pulling plate 11. In order to reduce the friction, the first roller 35 is rotatably connected to the bottom of the pulling plate 11. The first roller 35 and the first guide groove 37 are configured such that when the pulling plate 11 drives the first roller 35 to displace towards the first monitoring shell 5, the transverse movement plate 10 displaces towards the end of the telescopic gap 3. A side plate 33 corresponding to the longitudinal movement plate 32 is provided at the bottom of the first monitoring shell 5. A second guide groove 39 is obliquely arranged at one end of the side plate 33, and a third guide groove 40 is horizontally arranged at the lower end of the second guide groove 39. A second roller 38 for movably connecting to the second guide groove 39 and the third guide groove 40 is provided on the side of the longitudinal movement plate 32 close to the side plate 33. In order to reduce the friction, the second roller 38 is rotatably connected to the side wall of the longitudinal movement plate 32. The second roller 38 and the second guide groove 39 are configured such that when the transverse movement plate 10 drives the longitudinal movement plate 32 to displace towards the end of the telescopic gap 3, the longitudinal movement plate 32 simultaneously displaces downward, and when the second roller 38 enters the inner side of the third guide groove 40, the bottom of the cleaning piece 9 contacts the bottom wall of the telescopic gap 3.

[0043] During use, the displacement monitoring mechanism and the cleaning component are installed at appropriate positions in the expansion joint 3. When the bridge body 2 undergoes expansion and contraction displacement parallel to the bridge axis, the driving arm 14 will squeeze the slope 20 on the lifting frame 15 through the slope on the inner side of the notch 21. The slopes of the two slide, the lifting frame 15 moves downward, the second elastic member 19 is compressed, the lifting frame 15 drives the first pressing head 16 to squeeze the first pressure sensor 13, and at the same time, the first elastic member 17 contracts to adapt to the downward movement of the lifting frame 15. The first pressure sensor 13 detects the pressure data, thereby evaluating the displacement of the bridge body 2 parallel to the bridge axis. Whether the bridge body 2 on one side of the expansion joint 3 expands and contracts, or the bridge bodies 2 on both sides expand and contract simultaneously, the downward movement of the lifting frame 15 can drive the first pressing head 16 to apply pressure to the first pressure sensor 13. Moreover, since the outer diameter of the movable disk 27 is larger than the inner diameter of the installation groove 24, the driving rod 12 can only displace in the direction perpendicular to the axis of the second monitoring shell 7 inside the second monitoring shell 7. Therefore, the driving rod 12 will not squeeze the force receiving head 26, and thus the force receiving head 26 will not squeeze the second pressure sensor 25 through the second pressing head 30;

[0044] When the bridge body 2 undergoes displacement perpendicular to the bridge axis, the bridge body 2 will drive the entire force receiving head 26 and the second monitoring shell 7 to displace. Since one end of the driving rod 12 is fixedly connected to the pulling plate 11, the entire driving rod 12 and the movable disk 27 undergo relative displacement with the force receiving head 26 and the second monitoring shell 7. Furthermore, the third elastic member 28 is compressed, the inner wall of the driving groove 29 squeezes the force receiving head 26, and then the force receiving head 26 displaces towards the second pressure sensor 25 and squeezes the second pressure sensor 25 through the second pressing head 30. The fourth elastic member 31 will contract to adapt to the displacement of the force receiving head 26. Furthermore, the second pressure sensor 25 detects the pressure data, thereby evaluating the displacement of the bridge body 2 perpendicular to the bridge axis. Whether it is the influence of daily temperature, load, etc., or the influence of geological active faults, real-time monitoring can be achieved. Moreover, once data anomalies are caused by the influence of active faults, they can be discovered and dealt with in a timely manner;

[0045] In addition, when the bridge body 2 undergoes appropriate expansion and contraction under the influence of daily temperature, load, etc., the inside of the expansion joint 3 will be cleaned. Specifically, when the bridge body 2 expands and the expansion joint 3 becomes narrower, the bridge body 2 will drive the pulling plate 11 to displace towards the first monitoring shell 5. Furthermore, the first roller 35 squeezes the inner wall of the first guide groove 37, and the transverse movement plate 10 displaces towards the end of the expansion joint 3. During the displacement, the second roller 38 displaces inside the second guide groove 39. Furthermore, the longitudinal movement plate 32 will gradually move downward. When the second roller 38 enters the third guide groove 40, the longitudinal movement plate 32 will horizontally displace towards the end of the expansion joint 3. Furthermore, the connecting plate 6 drives the cleaning piece 9 to displace towards the end of the expansion joint 3, and the cleaning piece 9 realizes the cleaning and pushing out of impurities in the expansion joint 3. When the bridge body 2 contracts, the connecting plate 6 drives the cleaning piece 9 to reset and rise.

[0046] The above has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A bridge active fault monitoring device, comprising a cap (1), a bridge body (2) arranged on the cap (1), and an expansion gap (3) arranged between two adjacent bridge bodies (2), characterized in that: A displacement monitoring mechanism is provided in the expansion gap (3), the displacement monitoring mechanism comprising a first monitoring mechanism for monitoring displacement parallel to the axial direction of the bridge and a second monitoring mechanism for monitoring displacement perpendicular to the axial direction of the bridge; The first monitoring mechanism comprises a first monitoring shell (5) arranged inside the expansion gap (3) and fixed on the support platform (1); the first monitoring shell (5) is vertically and movably connected to a lifting frame (15) on the inside; a first pressure head (16) is arranged at the bottom of the lifting frame (15); a first elastic member (17) is arranged between the top of the first pressure head (16) and the bottom of the lifting frame (15); a first pressure sensor (13) fixed on the support platform (1) is arranged directly below the first pressure head (16); two pressure sensors (13) are arranged at the upper end of the lifting frame (15) along the width direction of the expansion gap (3); A slope (20) is provided on the opposite side edge, and a driving arm (14) is movably connected to the side wall of the first monitoring shell (5) at a position corresponding to the slope (20) along the width direction of the expansion gap (3), one end of the driving arm (14) extends to the inner side of the first monitoring shell (5), and a recess (21) corresponding to the slope (20) and in the shape of an isosceles trapezoid is provided at the bottom extending to one end of the inner side of the first monitoring shell (5), the slope (20) and the inner wall inclined surface of the recess (21) cooperate, so that when the driving arm (14) moves along the width direction of the expansion gap (3), the lifting frame (15) moves longitudinally; The second monitoring mechanism is arranged on the end side wall of the bridge body (2). The second monitoring mechanism includes a fixing plate (4) fixedly arranged on the end side wall of the bridge body (2). On the side of the fixing plate (4) away from the bridge body (2), there is an installation groove (24) corresponding to the first monitoring shell (5). Inside the installation groove (24), there is a second pressure sensor (25). On the side of the fixing plate (4) away from the bridge body (2), there is a circular second monitoring shell (7) fixedly arranged corresponding to the installation groove (24). On the side of the second monitoring shell (7) away from the fixing plate (4), there is a through hole (23). A driving rod (12) with a diameter smaller than the inner diameter of the through hole (23) is movably inserted through the through hole (23). At the outer side of the end of the driving rod (12) extending into the second monitoring shell (7), there is a movable disk (27) fixedly arranged in a ring shape and movably connected to the inner side of the second monitoring shell (7). Between the circumferential side wall of the movable disk (27) and the inner wall of the second monitoring shell (7), there are uniformly arranged third elastic members (28). At one end of the driving rod (12) close to the movable disk (27), there is a conical driving groove (29). The driving groove (29) is movably connected to a conical force-bearing head (26). One end of the force-bearing head (26) away from the driving rod (12) is movably connected to the installation groove (24) and corresponds to the second pressure sensor (25). At one end of the force-bearing head (26) close to the second pressure sensor (25), there is a second pressing head (30). Between the second pressing head (30) and the force-bearing head (26), there is a fourth elastic member (31). At the end of the driving rod (12) away from the movable disk (27), there is a pulling plate (11) corresponding to the driving arm (14). The side of the pulling plate (11) away from the driving rod (12) is fixedly connected to the end of the driving arm (14).

2. A bridge active fault monitoring device according to claim 1, characterized in that: The bottom of the first monitoring shell (5) is open, and the lifting frame (15) corresponds to the opening; The lifting frame (15) is in a "mouth" shape, and the slope surface (20) is arranged on the inner and outer sides of the upper opposite sides of the lifting frame (15).

3. The bridge active fault monitoring device according to claim 1, characterized in that: The outer diameter of the movable disk (27) is larger than the inner diameter of the installation groove (24), and the movable disk (27) is displaced along a direction perpendicular to the axial direction of the second monitoring shell (7) inside the second monitoring shell (7).

4. The bridge active fault monitoring device according to claim 1, characterized in that: At the end of the bottom of the first monitoring shell (5), a bracket (8) is fixedly arranged, and the lower end of the bracket (8) is fixed on the bearing platform (1).

5. The bridge active fault monitoring device according to claim 1, characterized in that: On the first monitoring mechanism, there is a reset assembly for resetting the lifting frame (15). The reset assembly includes a groove (22) arranged at the end of the lifting frame (15). At the upper end of the groove (22), a pin (18) is vertically movably connected, and the top of the pin (18) is fixedly connected to the top wall of the inner cavity of the first monitoring shell (5). Between the lower end of the pin (18) and the upper end inside the groove (22), there is a second elastic member (19), and it is configured that the second elastic member (19) contracts when the lifting frame (15) is displaced downward.

6. A bridge active fault monitoring device according to claim 5, characterized in that: The first elastic member (17), the second elastic member (19), the third elastic member (28) and the fourth elastic member (31) are springs.

7. The bridge active fault monitoring device according to claim 1, characterized in that: The cleaning assembly also includes a transverse plate (10) movably connected to the side wall of the first monitoring shell (5) along the length direction of the expansion gap (3), one end of the transverse plate (10) is vertically penetrated by a through groove (36), the through groove (36) is vertically movably connected to a longitudinal plate (32), a connecting plate (6) is horizontally arranged on the top of the longitudinal plate (32), and cleaning sheets (9) are evenly arranged on the bottom of the connecting plate (6), a first guide groove (37) is arranged on the top of one end of the transverse plate (10), and the through groove (36) is vertically movably connected to a longitudinal plate (32), a connecting plate (6) is horizontally arranged on the top of the longitudinal plate (32), and cleaning sheets (9) are evenly arranged on the bottom of the connecting plate (6), and a first guide groove (37) is arranged on the top of one end of the transverse plate (10). A first roller (35) movably connected to the first guide groove (37) is arranged at the bottom of the pulling plate (11); a side plate (33) corresponding to the longitudinal movement plate (32) is arranged at the bottom of the first monitoring shell (5); a second guide groove (39) is obliquely arranged at one end of the side plate (33); a third guide groove (40) is horizontally arranged at the lower end of the second guide groove (39); and a second roller (38) movably connected to the second guide groove (39) and the third guide groove (40) is arranged on a side of the longitudinal movement plate (32) close to the side plate (33).

8. A bridge active fault monitoring device according to claim 7, characterized in that: The first roller (35) and the first guide groove (37) are configured such that when the pulling plate (11) drives the first roller (35) to move in the direction of the first monitoring shell (5), the transverse plate (10) moves in the direction of the end of the expansion gap (3); The second roller (38) and the second guide groove (39) are configured such that when the transverse plate (10) drives the longitudinal plate (32) to move toward the end of the expansion gap (3), the longitudinal plate (32) simultaneously moves downward, and when the second roller (38) enters the inner side of the third guide groove (40), the bottom of the cleaning sheet (9) contacts the bottom wall of the expansion gap (3).

9. The bridge active fault monitoring device according to claim 7, characterized in that: The first roller (35) is rotatably connected to the bottom of the pulling plate (11); The second roller (38) is rotatably connected to the side wall of the longitudinal movement plate (32).

10. The bridge active fault monitoring device according to claim 7, characterized in that: A guide rail (34) corresponding to the transverse moving plate (10) is provided on the side wall of the first monitoring shell (5), and the transverse moving plate (10) is movably and guidingly connected to the guide rail (34).

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