Bridge lateral restraint device and restraining method thereof

Abstract

The application discloses a bridge transverse restraint device, which comprises a bearing plate, a bearing column fixedly arranged on the lower surface of the bearing plate, balance components symmetrically arranged on one side of the bearing column, a supporting plate, a stainless steel plate vertically and fixedly connected to the upper surface of the supporting plate, the stainless steel plate being arranged on the outer side of the balance components, the other side of the balance components being arranged in close contact with the inner wall of the stainless steel plate, and the balance components comprising first balance components and second balance components correspondingly arranged on the two side walls of the bearing column, wherein the first balance components and the second balance components are of the same structure, the symmetrically arranged balance components can effectively limit the transverse swing of the beam body caused by wind force or earthquake force when one transverse restraint device is installed, and the displacement and the rotation angle of the beam body in each direction can be met, so that the technical problem that the anti-wind support is symmetrically installed on the two sides of the bridge and is difficult to maintain is solved, and the technical effects of convenient installation and easy maintenance are achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of bridge construction technology, and more particularly relates to a bridge transverse restraint device and a restraint method thereof. BACKGROUND

[0002] With the rapid development of bridge construction technology, more and more large-span bridges cross rivers and seas, however, the larger the span of the bridge, the more the wind load acting area, and the greater the harm of wind load to the bridge, especially the full-floating system bridge. Therefore, how to improve the wind resistance of large-span, large-bearing-capacity cable-stayed bridges and suspension bridges, especially the transverse wind resistance of the beam body itself, is a very important problem. The wind-resistant support in the prior art is generally transversely arranged between the tower and the beam body, and is installed in pairs on both sides of the beam body, and is respectively anchored and connected with the tower body and the beam body to bear the transverse horizontal force transmitted by the beam body, which can effectively limit the large-distance swing of the beam body in the transverse direction caused by wind force or seismic force, and can also meet the displacement and angle requirements of the beam body in all directions. However, in this installation mode, the installation space on both sides of the beam body is limited due to part of the construction requirements, so the application range is small, and multiple installations are required, which is complicated to install and difficult to maintain and maintain in the later period. At the same time, the construction cost of the wind-resistant support installed in pairs is high, so it is a technical problem to be solved at present to provide a bridge transverse restraint device which is convenient to install, maintain and reduce construction cost. SUMMARY

[0003] The present application solves the technical problem of the wind-resistant support in the prior art which is inconvenient to install and maintain on both sides of the bridge.

[0004] To solve the above technical problems, the present application provides a bridge transverse restraint device, which comprises a load-bearing component, a balancing component arranged around the outer wall of the load-bearing component, and a support component fixedly connected with the outer wall of the balancing component.

[0005] The load-bearing component comprises a load-bearing plate, a load-bearing column fixedly arranged at the middle position of the lower surface of the load-bearing plate and perpendicular to the load-bearing plate, the load-bearing column is symmetrically arranged on one side of the balancing component, the support component comprises a support plate, a stainless steel plate is fixedly and vertically connected to the upper surface of the support plate, the stainless steel plate is arranged around the outer side of the balancing component, and the other side of the balancing component is arranged in close contact with the inner wall of the stainless steel plate.

[0006] The balancing component comprises a first balancing component and a second balancing component symmetrically arranged on the two side walls of the load-bearing column, the first balancing component and the second balancing component are both spherical hinge support structures with transverse expansion and contraction functions, the first balancing component and the second balancing component are the same in structure and are used for balancing the transverse displacement of the bridge.

[0007] Further, the first balancing component comprises a first balancing connector fixedly connected to the outer wall of the load-bearing column, a moving balancing component in sliding connection with the first balancing connector, and a plurality of matching areas provided on the corresponding side surfaces of the first balancing component and the moving balancing component, wherein an elastic structure for buffering the force acting between the first balancing connector and the moving balancing component is arranged inside the matching areas, and a first gap is formed between the first balancing component and the moving balancing component through the elastic structure, wherein the other side of the moving balancing component is in the shape of a concave arc, and the side of the second balancing connector movably arranged in the concave part of the moving balancing component is movably arranged in the inner wall of the stainless steel plate, the second balancing connector is hollow inside, and a second rotating wear-resistant plate is movably arranged in the hollow part of the second balancing connector, and a tensile shaft is fixedly connected to one side of the second rotating wear-resistant plate, and the tensile shaft passes through the moving balancing component and is arranged inside the moving balancing component.

[0008] Further, the matching areas are a plurality of grooves recessed inward along the side wall of the first balancing connector and a plurality of protrusions extending outward along the moving balancing component.

[0009] Further, the elastic structure is a disc spring.

[0010] Further, the second balancing component is fixedly connected to a first rotating wear-resistant plate on one side, the first rotating wear-resistant plate is arranged in the concave part of the moving balancing component, and a planar wear-resistant plate is fixedly connected to the other side, and the planar wear-resistant plate is arranged on the inner wall of the stainless steel plate.

[0011] Further, a U-shaped annular limiting groove is fixedly arranged on the upper end of the side wall of the first balancing connector, the moving balancing component is provided with a limiting protrusion extending outward at both ends, the limiting groove and the limiting protrusion are matched, the outer wall of the limiting protrusion is matched with the inner wall of the first balancing connector, the moving balancing component can move horizontally in the inner wall of the first balancing connector, a second gap is formed between the limiting groove and the limiting protrusion, and the limiting groove and the limiting protrusion limit the moving balancing component.

[0012] Further, the limiting protrusion and the limiting groove are respectively fixedly provided with a first buffer layer and a second buffer layer on the corresponding surfaces inside.

[0013] Further, a first reinforcing rib is fixedly arranged at the vertical position of the load-bearing plate and the load-bearing column.

[0014] Further, a second reinforcing rib is fixedly arranged at the vertical connection between the support plate and the stainless steel plate.

[0015] A bridge transverse constraint method, comprising:

[0016] S1: when the bridge is subjected to a lateral force, the bearing column is subjected to a lateral force and drives the first balance connecting piece and the force to move in the same direction, and the first balance connecting piece is close to the moving balance part;

[0017] S2: the first balance connecting piece (21) compresses the disc spring to cause elastic deformation, the compression amount of the disc spring gradually increases, so that the first gap between the first balance connecting piece and the moving balance part gradually decreases, until the groove formed on the side of the first balance connecting piece matches the protrusion formed on the side of the moving balance part;

[0018] S3: the first balance connecting piece on the other side moves in the direction of the external force, the second gap formed between the limiting grooves arranged at the edge positions on the upper and lower sides of the first balance connecting piece and the limiting protrusions on the upper and lower sides of the moving balance part gradually decreases, until the limiting grooves arranged at the edge positions on the upper and lower sides of the first balance connecting piece match the limiting protrusions on the upper and lower sides of the moving balance part, and the limiting is completed;

[0019] S4: the lateral force acting on the bridge disappears, the disc spring restores elastic deformation, and the bridge returns to the balanced state.

[0020] Overall, compared with the prior art, the above technical scheme conceived by the present application can achieve the following beneficial effects:

[0021] 1. The bridge lateral restraint device of the present application solves the problem that the installation of the lateral restraint device on both sides of the bridge cannot meet the requirements of some construction conditions, and achieves the technical effect of wide application range.

[0022] 2. The bridge lateral restraint device of the present application can meet the requirements of displacement and angle of rotation in all directions of the bridge by installing one bridge lateral restraint device, and solves the technical problems of complex installation and difficult maintenance of the bridge lateral restraint device in the prior art, and achieves the technical effects of easy installation and convenient maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the overall structure of the embodiment of the present application;

[0024] Figure 2 The figure is a schematic diagram of the structure of the embodiment of the present application;

[0025] Figure 3 The figure is a schematic diagram of the structure of the balance part in the embodiment of the present application;

[0026] Figure 4 The figure is a schematic diagram of the structure of the balance part in the embodiment of the present application; Figure 3 The figure is a schematic diagram of the structure of the balance part in the embodiment of the present application;

[0027] Figure 5 The method flowchart for constraining embodiments of the present application.

[0028] In all the drawings, the same reference signs refer to the same technical features, specifically: 1 - force bearing component, 11 - force bearing plate, 12 - first fastening component, 13 - force bearing column, 14 - first reinforcing rib, 2 - balancing component, 2'- first balancing component, 2"- second balancing component, 21 - first balancing connecting piece, 211 - groove, 22 - moving balancing component, 221 - protrusion, 222 - limiting protrusion, 223 - first buffer layer, 23 - second balancing connecting piece, 231 - planar wear-resistant plate, 232 - first rotating wear-resistant plate, 24 - second rotating wear-resistant plate, 241 - tensile shaft, 25 - limiting groove, 251 - second buffer layer, 26 - disc spring, 3 - support component, 31 - support plate, 32 - stainless steel plate, 33 - second reinforcing rib, 34 - second fastening component. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] Please refer to Figure 1 A bridge transverse restraint device shown in FIG. 1 comprises a force bearing component 1, a balancing component 2 arranged on the outer wall of the force bearing component 1, and a support component 3 fixedly connected to the outer wall of the balancing component 2. The force bearing component 1 is used to place a bridge body (not shown in the figure) and provide an action force opposite to the direction of the gravity of the bridge so as to balance the bridge. The balancing component 2 is used to balance the external action force causing the displacement of the bridge, avoid the damage of the bridge caused by the displacement of the bridge, and make the bridge in a dynamic balance state. The lower part of the support component 3 is used to fixedly connect a pier so as to make the support component 3 in a stable state. The upper part of the support component 3 is used to accommodate the balancing component 2 and provide an upward supporting force, so as to make the bridge in a balanced state.

[0031] Please refer to Figure 2As shown, the force bearing component 1 comprises a force bearing plate 11, which is a plate structure, the upper surface of the force bearing plate 11 is used to place a bridge (not shown in the figure), and provides upward support force for the bridge, a plurality of through holes are formed in the corresponding positions of the outer edge of the force bearing plate 11, and the plurality of through holes are used to set a first fastening component 12 for fixedly connecting the bridge and the force bearing plate 11, a force bearing column 13 is fixedly arranged at the middle position of the lower surface of the force bearing plate 11, the force bearing column 13 is arranged vertically to the force bearing plate 11, the force bearing column 13 is a cylindrical structure, a first reinforcing rib 14 is arranged around the vertical area of the force bearing column 13, the first reinforcing rib 14 is of any shape, and the first reinforcing rib 14 is used to reinforce the fixed connection between the force bearing plate 11 and the force bearing column 13.

[0032] Please refer to Figure 2 As shown, the balancing component 2 comprises a first balancing component 2' and a second balancing component 2'', the first balancing component 2' and the second balancing component 2'' are the same structure, and the first balancing component 2' and the second balancing component 2'' are symmetrically arranged at the two sides of the force bearing column 13, through the symmetric arrangement of the first balancing component 2' and the second balancing component 2'' at the two sides of the force bearing column 13, the first balancing component 2' and the second balancing component 2'' can move in the direction of the external force acting on the bridge to make the bridge in dynamic balance, through the symmetric arrangement of the first balancing component 2' and the second balancing component 2'', the first balancing component 2' and the second balancing component 2'' are respectively arranged at the two sides of the force bearing column 13, which solves the technical problems of complex installation, difficult maintenance and maintenance work and high construction cost of the damping support in the prior art, and achieves the technical effects of convenient installation, easy maintenance and low construction cost.

[0033] Please refer to Figure 3As shown, the first balancing component 2' includes a first balancing connecting piece 21 fixedly connected to one side of the load-bearing column 13, one side of the first balancing connecting piece 21 is a planar structure fixedly connected to the load-bearing column 13, the other side is recessed inwardly and forms a U-shaped structure, the inner side of the U-shaped structure is provided with a plurality of grooves 211, the upper end of the side wall of the first balancing connecting piece 21 is fixedly provided with an annular limiting groove 25 with a U-shaped cross section, the inner side of the limiting groove 25 is movably provided with a moving balancing component 22, one side of the moving balancing component 22 is formed with a protrusion 221 matched with the surface groove of the balancing connecting component 22, a plurality of grooves are formed inwardly around the outer wall of the protrusion 221, a disc spring 26 is arranged inside the grooves, one end of the disc spring 26 abuts the inner bottom wall of the groove formed around the outer wall of the protrusion 211, the other end abuts the surface of the balancing connecting piece, and the first gap is formed between the first balancing connecting piece 21 and the moving balancing component 22 through the disc spring 26, the first gap is a first buffer space for compressing the disc spring 26 to complete the lateral movement of the moving balancing component so as to make the bridge in dynamic balance, the limiting protrusions 222 are formed at the positions of the two ends of the moving balancing component 22 and extend outwardly, the outer wall of the limiting protrusion abuts the inner wall of the first balancing connecting piece 21, and the moving balancing component 22 can move horizontally in the inner wall of the first balancing connecting piece 21, the inner side end of the limiting groove 25 is used for limiting the movement of the limiting protrusion 222 of the first balancing connecting piece 21 to avoid the complete disengagement of the first balancing connecting piece 21 and the moving balancing component 22, the positions corresponding to the limiting groove 25 of the limiting protrusion 222 are provided with a first buffer layer 223 and a second buffer layer 251, the buffer layers are used for buffering the acting force generated after the limiting protrusion 222 and the limiting groove 25 are contacted, a second gap is formed between the limiting protrusion 222 and the limiting groove 25, the second gap is a second buffer space, the second buffer space is used for avoiding the falling of the moving balancing component 22 from the inside of the first balancing connecting piece 21, when the bridge is subjected to a lateral force, the acting force received by the bridge is transmitted to the load-bearing column 13 through the force plate 11 fixedly connected to the bridge, the load-bearing column 13 moves in the same direction as the acting force, at this time, the first balancing connecting piece 21 fixedly connected to the load-bearing column 13 moves to the moving balancing component 22, the disc spring 26 is compressed in the movement process, the length of the disc spring 26 gradually shortens, thereby the first gap between the first balancing connecting piece 21 and the moving balancing component 22 gradually decreases, until the grooves 211 formed on the side of the first balancing connecting piece 21 cooperate with the protrusions 221 formed on the side of the moving balancing component 22, at the same time, the first balancing connecting piece 21 on the other side moves in the direction of the external acting force, the second gap formed between the limiting grooves 25 arranged at the edge positions of the upper and lower sides of the first balancing connecting piece 21 and the limiting protrusions 222 of the moving balancing component 22 gradually decreases,The limiting grooves 25 arranged at the edge positions of the upper and lower sides of the first balance connecting piece 21 are in close contact with the limiting bosses 222 of the upper and lower sides of the moving balance component 22. When the lateral force disappears, the disc spring 26 restores the elastic deformation to transmit the force to the load-bearing column 13 through the first balance connecting piece 21, so that the load-bearing column is located at the middle position of the device. The other side of the moving balance component 22 is a concave circular arc. The second balance connecting piece 23 has a first rotating wear plate 232 near the side surface of the moving balance component. The first rotating wear plate 232 is movably arranged at the concave circular arc of the moving balance component 22. The first rotating wear plate 232 cooperates with the concave circular arc of the moving balance component 22, so that the second balance component 2" can form a rotating friction pair with the moving balance component, thereby enabling the bridge to move in a direction parallel to the bridge. The other side of the second balance connecting piece 23 is fixedly connected with a planar wear plate 231. The planar wear plate 231 is arranged in close contact with the support component 3. The planar wear plate 231 cooperates with the support component 3, so that a sliding friction pair can be formed between the planar wear plate 231 and the support component 3, thereby enabling the bridge to move vertically. The middle position of the second balance connecting piece 23 is concave to form a groove matched with a second rotating wear plate 24. The second rotating wear plate 24 is movably connected with the second balance connecting piece 23. The second rotating wear plate 24 is fixedly connected with one end of a tensile shaft 241 near the side surface of the moving balance component. The other end of the tensile shaft 241 passes through the second balance connecting piece 23 and is arranged inside the second balance connecting piece. The tensile shaft 241 and the second rotating wear plate 24 can rotate in the groove formed in the middle position of the second balance connecting piece 23. The tensile shaft 241 and the second rotating wear plate 24 can enable the load-bearing column 13 to rotate when the bridge is subjected to a force parallel to the bridge, thereby buffering the force applied to the bridge. The symmetrical arrangement of the first balance component 2' and the second balance component 2" enables the first balance component 2' and the second balance component 2" to buffer the force applied to the bridge when the bridge is subjected to a lateral displacement, thereby enabling the bridge to be in a dynamic balance device. The technical problem of limited installation space of the existing technology shock-absorbing support installed on both sides of the bridge is solved, and the technical effect of convenient installation is achieved.

[0034] Please refer to Figure 2As shown, the support component 3 comprises a support plate 31, which is a plate structure, the bottom of the support plate 31 is fixedly connected with a plurality of second fastening components 34, the second fastening components 34 are used for fixedly connecting the support plate 31 and a pier (not shown in the figure), the upper surface of the support plate 31 is fixedly connected with a stainless steel plate 32, the stainless steel plate 32 is vertically arranged with the support plate 31, the stainless steel plate 32 is arranged around the outside of the balancing component 2, the other side of the second balancing connecting piece 23 is arranged in the inside of the stainless steel plate 32, the outside of the stainless steel plate 32 is arranged with a second reinforcing rib 33 at the vertical position of the support plate 31, the second reinforcing rib 33 is used for reinforcing the connection between the stainless steel plate 32 and the support plate 31, through the support component 3 containing the first balancing component 2', the second balancing component 2" and the bearing column 13, the technical problem that the existing technology damping support is installed in the limited space position on both sides of the bridge is solved, and the technical effect that the installation is facilitated is achieved.

[0035] In use, the support plate 31 is placed on the upper surface of the pier (not shown in the figure), the pier and the support plate 31 are fixedly connected through the second fastening component 34, the bridge (not shown in the figure) is placed on the upper surface of the bearing plate 11, the bridge and the bearing plate 11 are fixedly connected through the first fastening component 12, at this time the device is subjected to the downward force of the bridge under the gravity of the bridge, the upward force provided by the device balances the force applied by the bridge, so that the bridge is in a balanced state, when the bridge is subjected to the lateral force under the condition of external force, the force applied to the bridge is transmitted to the bearing column 13 through the bearing plate 11 fixedly connected with the bridge, the bearing column 13 is subjected to the lateral force and moves in the same direction as the force, at this time the first balance connecting piece 21 moves towards the moving balance component 22 through the fixed connection with the bearing column 13, the disc spring 26 is compressed in the movement process, the length of the disc spring 26 gradually shortens, so that the first gap between the first balance connecting piece 21 and the moving balance component 22 gradually decreases, until the groove 211 formed on the side surface of the first balance connecting piece 21 matches the protrusion 221 formed on the side surface of the moving balance component 22, at the same time, the first balance connecting piece 21 on the opposite side moves in the direction of the external force, the second gap formed between the limiting groove 25 arranged at the edge position on the upper and lower sides of the first balance connecting piece 21 and the limiting boss 222 on the upper and lower sides of the moving balance component 22 gradually decreases, until the limiting groove 25 arranged at the edge position on the upper and lower sides of the first balance connecting piece 21 matches the limiting boss 222 on the upper and lower sides of the moving balance component 22, when the lateral force disappears, the disc spring 26 restores the elastic deformation to transmit the force to the bearing column 13 through the first balance connecting piece 21, so that the bearing column is located at the middle position of the device, when the device is subjected to the force parallel to the direction of the bridge, the force applied to the bridge is transmitted to the bearing column 13 through the bearing plate 11 fixedly connected with the bridge, the bearing column 13 is subjected to the force parallel to the direction of the bridge and moves in the same direction as the force, at the same time, the moving balance component 22 rotates, the second balance component 2" can form a rotating friction pair with the moving balance component through the cooperation of the first rotating wear plate 232 and the inwardly recessed arc of the moving balance component 22, so that the bridge can move in the direction parallel to the bridge.

[0036] Those skilled in the art will easily understand that the above description is only the preferred embodiment of the present application and is not intended to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bridge lateral restraint device, characterized by, The utility model provides a bridge balance device, including bearing component (1), the balance component (2) of setting around in the outer wall of bearing component (1), with the fixed connection of balance component (2) outer wall support component (3); The bearing component (1) includes a bearing plate (11), a bearing column (13) fixedly arranged at a middle position of a lower surface of the bearing plate (11) and perpendicular to the bearing plate (11), the bearing column (13) is symmetrically arranged on one side of the balance component (2), the support component (3) includes a support plate (31), a stainless steel plate (32) is fixedly and vertically connected to an upper surface of the support plate (31), the stainless steel plate (32) is arranged around the outer side of the balance component (2), and the other side of the balance component (2) is arranged in close contact with the inner wall of the stainless steel plate (32); The balance component (2) includes a first balance component (2') and a second balance component (2") symmetrically arranged on the two side walls of the bearing column (13), and the first balance component (2') and the second balance component (2") are both spherical hinge support structures with transverse expansion and contraction functions; the first balance component (2') and the second balance component (2") are the same in structure and are used for balancing the transverse displacement of the bridge; The first balance component (2') includes a first balance connecting piece (21) fixedly connected to the outer side wall of the bearing column (13), a moving balance component (22) in sliding connection with the first balance connecting piece (21), a plurality of matching areas are arranged on the corresponding side surfaces of the first balance component and the moving balance component (22), an elastic structure for buffering the force acting between the first balance connecting piece (21) and the moving balance component (22) is arranged in the plurality of matching areas, a first gap is formed between the first balance component and the moving balance component (22) through the elastic structure, the other side of the moving balance component (22) is in the form of a concave arc, one side of a second balance connecting piece (23) movably arranged in the concave part of the moving balance component (22), the other side of the second balance connecting piece (23) is movably arranged in the inner side wall of the stainless steel plate (32), the second balance connecting piece (23) is hollow, a second rotating wear-resistant plate (24) is movably arranged in the hollow part of the second balance connecting piece (23), a tensile shaft (241) is fixedly connected to one side of the second rotating wear-resistant plate (24), and the tensile shaft (241) passes through the moving balance component (22) and is arranged in the moving balance component (22); The matching areas are a plurality of grooves (211) recessed inward along the side wall of the first balance connecting piece (21) and a plurality of protrusions (221) extending outward along the moving balance component (22). The first balance connecting piece (21) is provided with an annular limiting groove (25) with a U-shaped cross section at the upside of the side wall, the moving balance component (22) is provided with a limiting protrusion (222) at both ends, the limiting groove (25) cooperates with the limiting protrusion (222), the limiting protrusion (222) is attached to the inner wall of the first balance connecting piece (21), the moving balance component (22) moves horizontally in the inner wall of the first balance connecting piece (21), the limiting groove (25) and the limiting protrusion (222) are provided with a second gap at the inner side, and the limiting groove (25) cooperates with the limiting protrusion (222) to limit the moving balance component (22).

2. The bridge lateral restraint device of claim 1, wherein, The elastic structure is a disc spring (26).

3. The bridge lateral restraint device of claim 1, wherein, The second balance component is fixedly connected with a first rotating wear-resistant plate (232) on one side, the first rotating wear-resistant plate (232) is attached to the recess of the moving balance component (22), and a flat wear-resistant plate (231) is fixedly connected on the other side, and the flat wear-resistant plate (231) is attached to the inner wall of the stainless steel plate (32).

4. The bridge lateral restraint device of claim 1, wherein, The force bearing plate (11) and the force bearing column (13) are fixedly provided with a first reinforcing rib (14) at the vertical position. The support plate (31) and the stainless steel plate (32) are fixedly provided with a second reinforcing rib (33) at the vertical connection position.

5. The bridge lateral restraint device of claim 1, wherein, Comprise:

6. The transverse restraint method of a bridge transverse restraint device according to claim 1, characterized by, S1: when the bridge is subjected to a lateral force, the force bearing column (13) is subjected to a lateral force and drives the first balance connecting piece (21) and the force to move in the same direction, and the first balance connecting piece (21) is close to the moving balance component (22); S2: the first balance connecting piece (21) compresses the disc spring (26) to make it elastically deformed, the compression amount of the disc spring (26) gradually increases, so that the first gap between the first balance connecting piece (21) and the moving balance component (22) gradually decreases, until the groove formed on the side of the first balance connecting piece (21) cooperates with the protrusion formed on the side of the moving balance component (22); S3: the other side of the first balance connecting piece (21) moves along the direction of the external force, the limiting groove (25) provided at the edge position of the first balance connecting piece (21) and the limiting protrusion (222) provided at the edge position of the moving balance component (22) form a second gap, the second gap gradually decreases, until the limiting groove (25) provided at the edge position of the first balance connecting piece (21) cooperates with the limiting protrusion (222) provided at the edge position of the moving balance component (22), and the limiting is completed; S4: the lateral force acting on the bridge disappears, the disc spring (26) restores the elastic deformation, and the bridge returns to the balanced state. ​ ​ ​

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