Bridge active fault monitoring device

Abstract

The invention relates to the field of bridge monitoring, and particularly discloses a bridge active fault monitoring device, which comprises a bearing platform, bridge bodies arranged on the bearing platform and a telescopic gap arranged between two adjacent bridge bodies, and a displacement monitoring mechanism is arranged in the telescopic gap. The displacement monitoring mechanism comprises a first monitoring mechanism used for monitoring axial displacement parallel to the bridge and a second monitoring mechanism used for monitoring axial displacement perpendicular to the bridge. According to the bridge active fault monitoring device, the displacement monitoring mechanisms comprise the first monitoring mechanism used for monitoring the displacement parallel to the axial direction of the bridge and the second monitoring mechanism used for monitoring the displacement perpendicular to the axial direction of the bridge, so that the displacement change of the bridge body in any direction can be monitored in real time; the expansion change of the bridge body caused by the influence of load, temperature and the like in daily life can be monitored, and the abnormal influence on the bridge body during the displacement of the active fault can be conveniently and timely handled.

Description

Technical Field

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

[0002] Bridge expansion joints are gaps set in the superstructure of a bridge to accommodate the expansion and contraction of materials. They are used to adjust the displacement between the superstructures caused by factors such as external temperature changes, concrete creep and drying shrinkage, and they also directly bear the repeated impact of wheel loads. It is the most vulnerable part of the bridge structure. Once damaged, the joints will sink and the road surface at the joints will be damaged, resulting in steps of different heights, causing passing vehicles to jump, making people on the vehicles feel uncomfortable, and even causing traffic accidents, affecting the normal operation of the bridge. Therefore, monitoring bridge expansion joints is an important measure to ensure the safety of bridge structures and traffic experience.

[0003] A monitoring device for a large displacement expansion joint structure of a bridge is disclosed in Chinese Patent Publication No. CN211626543U, which includes a support plate, a support column is fixedly connected to the middle of the upper surface of the support plate, a cavity is opened 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 arranged to cooperate with each other to realize monitoring. Although the changes of the expansion joint can be monitored in real time, the monitoring direction is limited. Generally, only the changes occurring in the direction parallel to the axis of the bridge can be monitored, and the pressure sensor can only realize monitoring when the expansion joint becomes narrower. The changes perpendicular to the axis of the bridge and the widening of the expansion joint cannot be effectively monitored, especially the impact of the displacement change of the active fault on the bridge cannot be effectively monitored. The 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 parallel to the axis of the bridge, but also affect the displacement change perpendicular to the axis of 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 of the expansion joint of the bridge caused by multiple factors.

[0005] Therefore, it is 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 technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is: A bridge active fault monitoring device, comprising 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. 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; The first monitoring mechanism includes a first monitoring shell arranged on the inner side of the telescopic gap and fixed on the bearing platform. A lifting frame is vertically movably connected to the inner side of the first monitoring shell. A first pressing head is arranged at the bottom of the lifting frame. A first elastic member is arranged 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 arranged directly below the first pressing head. Slopes are arranged on two opposite side edges of the upper end of the lifting frame along the width direction of the telescopic gap. A driving arm is movably connected to the corresponding position of the side wall of the first monitoring shell and the slope along the width direction of the telescopic gap. One end of the driving arm extends to the inner side of the first monitoring shell, and a notch in the shape of an isosceles trapezoid corresponding to the slope is arranged at the bottom of the end extending to the inner side of the first monitoring shell. The slope cooperates 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; The second monitoring mechanism is arranged on the end side wall of the bridge body. The second monitoring mechanism includes a fixing plate fixedly arranged on the end side wall of the bridge body. An installation groove corresponding to the first monitoring shell is arranged on the side of the fixing plate away from the bridge body. A second pressure sensor is arranged inside the installation groove. A second monitoring shell in the shape of a circle corresponding to the installation groove is fixedly arranged on the side of the fixing plate away from the bridge body. A through hole is arranged 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. A movable disk in the shape of a ring and movably connected to the inner side of the second monitoring shell is fixedly arranged on the outer side of the end of the driving rod extending to the inner side of the second monitoring shell. A third elastic member is evenly arranged between the circumferential side wall of the movable disk and the inner wall of the second monitoring shell. A conical driving groove is arranged at the end of the driving rod close to the movable disk. A conical force receiving head is movably connected to the driving groove. One end of the force receiving 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 arranged at the end of the force receiving head close to the second pressure sensor. A fourth elastic member is arranged between the second pressing head and the force receiving head. A pulling plate corresponding to the driving arm is fixedly arranged at the end of the driving rod away from the movable disk. The side of the pulling plate away from the driving rod is fixedly connected to the end of the driving arm.

[0008] Preferably, the bottom of the first monitoring shell is open, and the lifting frame corresponds to the opening; The lifting frame is in the shape of a "mouth", and the slopes are arranged on the inner and outer sides of the opposite side edges of the upper end of the lifting frame.

[0009] Preferably, the outer diameter of the movable disk is larger than the inner diameter of the mounting groove, and the movable disk is displaced on the inner side of the second monitoring shell along a direction perpendicular to the axial direction of the second monitoring shell.

[0010] Preferably, a bracket is fixedly provided at the end of the bottom of the first monitoring shell, and the lower end of the bracket is fixed on the support platform.

[0011] Preferably, the first monitoring mechanism is provided with a reset component for resetting the lifting frame, the reset component includes a groove arranged at the end of the lifting frame, the upper end of the groove is vertically movably connected with a pin, and the top of the pin is fixedly connected to the top wall of the inner cavity of the first monitoring shell, and a second elastic member is arranged between the lower end of the pin and the inner upper end of the groove, and is configured so that the second elastic member contracts when the lifting frame moves downward.

[0012] Preferably, the first elastic member, the second elastic member, the third elastic member and the fourth elastic member are springs.

[0013] Preferably, it also includes a cleaning component, which includes a transverse plate movably connected to the side wall of the first monitoring shell along the length direction of the expansion gap, one end of the transverse plate is vertically provided with a through groove, the through groove is vertically movably connected to the longitudinal plate, the top of the longitudinal plate is horizontally provided with a connecting plate, and the bottom of the connecting plate is evenly provided with cleaning sheets, a first guide groove is provided at the top of one end of the transverse plate, a first roller movably connected to the first guide groove is provided at the bottom of the pulling plate, a side plate corresponding to the longitudinal plate is provided at the bottom of the first monitoring shell, a second guide groove is obliquely provided at one end of the side plate, a third guide groove is horizontally provided at the lower end of the second guide groove, and a second roller for movably connecting to the second guide groove and the third guide groove is provided on the side of the longitudinal plate close to the side plate.

[0014] Preferably, the first roller and the first guide groove are configured so that when the pulling plate drives the first roller to move toward the first monitoring shell, the transverse plate moves toward the end of the expansion gap; The second roller and the second guide groove are configured so that when the transverse plate drives the longitudinal plate to move toward the end of the expansion gap, the longitudinal plate simultaneously moves 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 expansion gap.

[0015] Preferably, the first roller is rotatably connected to the bottom of the pulling plate; The second roller is rotatably connected to the side wall of the longitudinal movement plate.

[0016] Preferably, the side wall of the first monitoring shell is provided with a guide rail corresponding to the transverse moving plate, and the transverse moving plate is movably and guidingly connected to the guide rail.

[0017] Compared with the prior art, the present invention provides a bridge active fault monitoring device, which has the following beneficial effects: 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.

[0018] 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

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the displacement monitoring mechanism and the cleaning component of the present invention; Figure 3 The present invention Figure 2 Schematic diagram of the structure when the foundation is disassembled; 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; Figure 5 The present invention Figure 4 A structural diagram from another perspective based on the above; 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; Figure 7 It is a schematic diagram of the overall structure of the fixing plate and the second monitoring shell of the present invention; 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; Fig. 9 The present invention Figure 8 A structural diagram from another perspective based on the above; Fig.10 It is a structural schematic diagram of the first monitoring shell, the pulling plate and the cleaning component on one side of the present invention in a coordinated state; Fig.11 It is a schematic diagram of the structure of the cleaning component of the present invention in a disassembled state.

[0020] In the figure: 1, bearing platform; 2, bridge body; 3, expansion gap; 4, fixing plate; 5, first monitoring shell; 6, connecting plate; 7, second monitoring shell; 8, bracket; 9, cleaning sheet; 10, transverse plate; 11, pulling plate; 12, driving rod; 13, first pressure sensor; 14, driving arm; 15, lifting frame; 16, first pressure head; 17, first elastic member; 18, pin; 19, second elastic member; 20, slope; 21 , notch; 22, groove; 23, through hole; 24, mounting groove; 25, second pressure sensor; 26, force head; 27, movable disk; 28, third elastic member; 29, driving groove; 30, second pressure head; 31, fourth elastic member; 32, longitudinal plate; 33, side plate; 34, guide rail; 35, first roller; 36, through groove; 37, first guide groove; 38, second roller; 39, second guide groove; 40, third guide groove. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] like Figure 1-Figure 6 As shown, a bridge active fault monitoring device comprises a pedestal 1, a bridge body 2 arranged on the pedestal 1 and an expansion gap 3 arranged between two adjacent bridge bodies 2, a displacement monitoring mechanism is arranged in the expansion gap 3, the displacement monitoring mechanism comprises 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, as a preferred embodiment, the first monitoring mechanism comprises a first monitoring shell 5 arranged on the inner side of the expansion gap 3 and fixed on the pedestal 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 to the pedestal 1 by bolts, a lifting frame 15 is vertically and movably connected to the inner side of the first monitoring shell 5, the bottom of the first monitoring shell 5 is open, the lifting frame 15 corresponds to the opening, a first pressure head 16 is arranged at the bottom of the lifting frame 15, and the top of the first pressure head 16 is connected to the bottom of the lifting frame 15 A first elastic member 17 is arranged between the parts, and the first elastic member 17 is preferably a spring. A first pressure sensor 13 fixed on the base 1 is arranged directly below the first pressure head 16. A slope 20 is arranged on two opposite sides of the upper end of the lifting frame 15 along the width direction of the expansion gap 3. Specifically, the lifting frame 15 is in the shape of a "mouth", and the slope 20 is arranged on the inner and outer sides of the opposite sides of the upper end of the lifting frame 15. The driving arm 14 is movably connected to the corresponding part of the side wall of the first monitoring shell 5 and 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 extends to the bottom of one end of the inner side of the first monitoring shell 5. A recess 21 corresponding to the slope 20 and in the shape of an isosceles trapezoid is arranged. The slope 20 cooperates with the inner wall inclined surface of the recess 21, so that when the driving arm 14 moves along the width direction of the expansion gap 3, the lifting frame 15 moves longitudinally; like Figure 6 As shown, in order to facilitate the resetting of the lifting frame 15, a resetting component for resetting the lifting frame 15 is provided on the first monitoring mechanism, and the resetting component includes a groove 22 provided at the end of the lifting frame 15, and the upper end of the groove 22 is vertically and movably connected with a pin 18, the cross section of the pin 18 is "T"-shaped, and the top of the pin 18 is fixedly connected to the inner cavity top wall of the first monitoring shell 5, and a second elastic member 19 is provided between the lower end of the pin 18 and the inner upper end of the groove 22. The second elastic member 19 is preferably a spring, which is sleeved on the outer side of the lower end of the pin 18 and is configured so that the second elastic member 19 contracts when the lifting frame 15 moves downward; like Figure 1-Figure 3 , Figure 7-Figure 9 As shown, as a preferred embodiment, the second monitoring mechanism is arranged on the end side wall of the bridge body 2, and the second monitoring mechanism includes a fixing plate 4 fixedly arranged on the end side wall of the bridge body 2 by bolts, and a mounting groove 24 corresponding to the first monitoring shell 5 is arranged on the side of the fixing plate 4 away from the bridge body 2, and a second pressure sensor 25 is arranged on the inner side of the mounting groove 24, and a second monitoring shell 7 corresponding to the mounting groove 24 and in a circular shape is fixedly arranged on the side of the fixing plate 4 away from the bridge body 2, and a through hole 23 is arranged on the side of the second monitoring shell 7 away from the fixing plate 4, and a driving rod 12 with a diameter smaller than the inner diameter of the through hole 23 is movably inserted into the through hole 23, and a movable disk 27 in an annular shape and movably connected to the inner side of the second monitoring shell 7 is fixedly arranged on the outer side of one end of the driving rod 12 extending to the inner side of the second monitoring shell 7, and the movable disk 27 can only be displaced along the direction perpendicular to the axial direction of the second monitoring shell 7 on the inner side of the second monitoring shell 7, and the outer diameter of the movable disk 27 is larger than the inner diameter of the mounting groove 24, and the circumferential direction of the movable disk 27 is larger than the inner diameter of the mounting groove 24. A third elastic member 28 is evenly arranged between the side wall and the inner wall of the second monitoring shell 7. The third elastic member 28 is preferably a spring. A conical driving groove 29 is arranged at one end of the driving rod 12 close to the movable disk 27. The driving groove 29 is movably connected with a conical force-bearing head 26. The force-bearing head 26 matches the driving groove 29, so that when the movable disk 27 is displaced along an axial direction perpendicular to the second monitoring shell 7, the force-bearing head 26 is squeezed and displaced in a direction away from the driving rod 12. The end of the force-bearing head 26 away from the driving rod 12 is movably connected to the mounting groove 24 and corresponds to the second pressure sensor 25. A second pressure head 30 is arranged at one end of the force-bearing head 26 close to the second pressure sensor 25. A fourth elastic member 31 is arranged between the second pressure head 30 and the force-bearing head 26. The fourth elastic member 31 is preferably a spring. A pulling plate 11 corresponding to the driving arm 14 is fixedly arranged at one end of the driving rod 12 away from the movable disk 27. The side of the pulling plate 11 away from the driving rod 12 is fixedly connected to the end of the driving arm 14.

[0023] In addition, if Figure 1-Figure 3 , Figure 10-11As shown, in order to realize the cleaning of the inner side of the expansion gap 3, a cleaning component is provided. As a preferred embodiment, the cleaning component 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. Specifically, the side wall of the first monitoring shell 5 is provided with a guide rail 34 corresponding to the transverse plate 10, and the transverse plate 10 is located on the side of the first monitoring shell 5 facing the bridge body 2, and the transverse plates 10 are symmetrically provided at both ends of the side of the first monitoring shell 5 facing the bridge body 2, and the transverse plate 10 is movably guided and connected to the guide rail 34, and a through groove 36 is vertically penetrated at one end of the transverse plate 10, and the through groove 36 is vertically movably connected to the longitudinal plate 32, and a connecting plate 6 is horizontally provided on the top of the longitudinal plate 32, and cleaning sheets 9 are evenly provided on the bottom of the connecting plate 6, and a first guide groove 37 is provided on the top of one end of the transverse plate 10, and the two first guide grooves 37 located on the same side of the first monitoring shell 5 are in an "eight" shape, and 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 force, 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 so that when the pulling plate 11 drives the first roller 35 to move toward the direction of the first monitoring shell 5, the transverse plate 10 moves toward the end direction of the expansion gap 3. The bottom of the first monitoring shell 5 is provided with a side plate 33 corresponding to the longitudinal plate 32. One end of the side plate 33 is obliquely provided with a second guide groove 39. The lower end of the second guide groove 39 is horizontally provided with a third guide groove 40. The longitudinal plate 3 A second roller 38 for movably connecting with the second guide groove 39 and the third guide groove 40 is provided on one side close to the side plate 33. In order to reduce the friction force, the second roller 38 is rotatably connected to the side wall of the longitudinal moving plate 32. The second roller 38 and the second guide groove 39 are configured so that when the transverse moving plate 10 drives the longitudinal moving plate 32 to move toward the end direction of the expansion gap 3, the longitudinal moving 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.

[0024] When in use, the displacement monitoring mechanism and the cleaning component are installed at a suitable position in the expansion gap 3. When the bridge body 2 undergoes a telescopic displacement parallel to the axial direction of the bridge, the driving arm 14 will squeeze the slope 20 on the lifting frame 15 through the inclined surface inside the notch 21. The two inclined surfaces slide, the lifting frame 15 moves downward, the second elastic member 19 is compressed, and the lifting frame 15 drives the first pressure head 16 to squeeze the first pressure sensor 13. 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 whether the bridge body 2 is parallel to the bridge axis. Regarding the axial displacement of the bridge, whether the bridge body 2 on one side of the expansion gap 3 is expanded or contracted, or the bridge bodies 2 on both sides are expanded or contracted at the same time, the lifting frame 15 can move downward to drive the first pressure head 16 to apply pressure to the first pressure sensor 13, and because the outer diameter of the movable disk 27 is larger than the inner diameter of the mounting groove 24, the driving rod 12 can only be displaced on the inner side of the second monitoring shell 7 in a direction perpendicular to the axial direction of the second monitoring shell 7, so the driving rod 12 will not squeeze the force-bearing head 26, and further the force-bearing head 26 will not squeeze the second pressure sensor 25 through the second pressure head 30; When the bridge body 2 is displaced perpendicularly to the axial direction of the bridge, the bridge body 2 will drive the force head 26 and the second monitoring shell 7 to displace as a whole. Since one end of the driving rod 12 is fixedly connected to the pulling plate 11, the driving rod 12, the movable disk 27, the force head 26 and the second monitoring shell 7 are relatively displaced as a whole, and then the third elastic member 28 is compressed, and the inner wall of the driving groove 29 squeezes the force head 26, and then the force head 26 is displaced in the direction of the second pressure sensor 25 and squeezes the second pressure sensor 25 through the second pressure head 30. The fourth elastic member 31 will shrink to adapt to the displacement of the force head 26, and then the second pressure sensor 25 detects pressure data, thereby evaluating the displacement of the bridge body 2 perpendicular to the axial direction of the bridge. Whether it is the influence of daily temperature, load, etc., or the influence of geological active faults, real-time monitoring can be achieved, and once the data is abnormal due to the influence of active faults, it can be discovered and dealt with in time; In addition, when the bridge body 2 is appropriately expanded and contracted due to the influence of daily temperature, load, etc., the inside of the expansion gap 3 will be cleaned. Specifically, when the bridge body 2 expands and causes the expansion gap 3 to narrow, the bridge body 2 will drive the pulling plate 11 to move toward the first monitoring shell 5, and then the first roller 35 squeezes the inner wall of the first guide groove 37, and the transverse plate 10 moves toward the end of the expansion gap 3. During the displacement, the second roller 38 moves on the inner side of the second guide groove 39, and then the longitudinal plate 32 will gradually move downward. When the second roller 38 enters the third guide groove 40, the longitudinal plate 32 will move horizontally toward the end of the expansion gap 3, and then the connecting plate 6 drives the cleaning sheet 9 to move toward the end of the expansion gap 3. The cleaning sheet 9 cleans and pushes out impurities in the expansion gap 3. When the bridge body 2 contracts, the connecting plate 6 drives the cleaning sheet 9 to reset and rise.

[0025] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

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). The through hole (23) is movably penetrated by a driving rod (12) whose diameter is smaller than the inner diameter of 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-receiving head (26). 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). 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 the 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), there is a pin (18) 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 of the inner side of 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) moves 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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