CN114322880A - Displacement monitoring device and displacement monitoring method for bridge support - Google Patents
Displacement monitoring device and displacement monitoring method for bridge support Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 119
- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000012806 monitoring device Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004026 adhesive bonding Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 13
- 238000009434 installation Methods 0.000 description 6
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- 230000001174 ascending effect Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
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- 238000012935 Averaging Methods 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
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Abstract
The application discloses a displacement monitoring device and a displacement monitoring method for a bridge support, wherein the displacement monitoring device comprises a supporting component and an inclination angle sensor, and the supporting component can be connected between the bottom of a beam body and the top of a bridge pier in a telescopic and multidirectional rotating manner; the inclination angle sensor is fixedly arranged on the supporting component and used for measuring the inclination angle of the supporting component along the bridge direction and the inclination angle along the transverse bridge direction so as to monitor the displacement of the support along the bridge direction and the displacement along the transverse bridge direction. The embodiment of the application adopts the support component which can be contracted and can rotate in multiple directions and the tilt angle sensor, so that the measuring precision is improved, and the service life of the sensor is prolonged.
Description
Technical Field
The application relates to the technical field of bridge detection, in particular to a displacement monitoring device and a displacement monitoring method for a bridge support.
Background
For displacement monitoring of a bridge support, one displacement sensor in traditional unidirectional support displacement measurement can only monitor displacement in one direction, the displacement sensor must be strictly arranged along the measurement direction during measurement, and movement in the other direction may cause deformation and jamming of a pull rod or a guide rod of the displacement sensor.
Disclosure of Invention
In view of this, the embodiments of the present application are expected to provide a displacement monitoring device and a displacement monitoring method for a bridge bearer, so as to solve the problems that the installation requirement of a sensor is high or the sensor is easily damaged.
In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:
in one aspect of the embodiment of the application, a displacement monitoring device for a bridge bearing is disclosed, which comprises:
the supporting component can be connected between the bottom of the beam body and the top of the pier in a telescopic and multi-direction rotating manner; and
the inclination angle sensor is fixedly arranged on the supporting component and used for measuring the inclination angle of the supporting component along the bridge direction and the inclination angle along the transverse bridge direction so as to monitor the displacement of the support along the bridge direction and the displacement along the transverse bridge direction.
Furthermore, the supporting assembly comprises a base, a telescopic connecting rod and a rotating part, and the base is fixedly arranged at the bottom of the beam body and the top of the pier; the two ends of the telescopic connecting rod are respectively connected with the rotating piece, the rotating pieces at the two ends are respectively connected with the corresponding base in a multidirectional rotating mode, and the inclination angle sensor is arranged on the telescopic connecting rod.
Furthermore, the tilt angle sensor is externally arranged on the telescopic connecting rod.
Further, the base and the rotating member are configured as a ball joint structure, one of the base and the rotating member includes a ball head, and the other of the base and the rotating member includes a groove rotatably connected with the ball head.
Further, the base, the telescopic connecting rod and the rotating piece are all rigid pieces;
further, the base, the pantograph linkage and the rotary member are provided with a corrosion-resistant coating.
Further, the fixed mode of setting of base is spiro union, gluing or welding.
Further, the tilt sensor is a dual-axis tilt sensor.
On the other hand, the embodiment of the application discloses a displacement monitoring method for a bridge bearing, which utilizes the displacement monitoring device described in any one of the above items, and the displacement monitoring method comprises the following steps:
acquiring the vertical distance between two rotation centers of the support assembly;
acquiring an inclination angle of the supporting component along the forward bridge direction and an inclination angle of the supporting component along the transverse bridge direction, which are measured by the inclination angle sensor at a certain moment;
and calculating to obtain the displacement of the support along the forward bridge direction and the displacement along the transverse bridge direction at the moment.
Further, the displacement monitoring method further comprises:
and acquiring an initial angle of the support assembly measured by the tilt angle sensor along the forward bridge direction and an initial angle of the support assembly measured by the tilt angle sensor along the transverse bridge direction.
Further, the step of calculating the displacement of the support along the forward bridge direction and the displacement along the transverse bridge direction at the moment is specifically to calculate the displacement of the support along the forward bridge direction and the displacement along the transverse bridge direction at the moment according to the following functional relation:
Sx＝H×(tanθx-tanθx0)
Sy＝H×(tanθy-tanθy0)
wherein S isxFor displacement of the support in the direction of the bridge, SyFor the displacement of the support in the transverse direction, H is the vertical distance between the two centers of rotation of the support assembly, θx0An initial angle, θ, of the support assembly along the downbridge direction measured for the tilt sensory0Initial angle, θ, of the support assembly in the transverse bridge direction measured for the tilt sensorxThe inclination angle, theta, of the support member in the direction of the bridge, measured by the inclination sensor at a timeyThe inclination angle of the supporting component along the transverse bridge direction is measured by the inclination angle sensor at a certain moment.
The embodiment of the application discloses displacement monitoring device and displacement monitoring method of bridge beam supports, but through setting up the telescopic multidirectional pivoted supporting component between roof beam body bottom and pier top, and adopt inclination sensor real-time measurement along the inclination of bridge direction and the inclination of horizontal bridge direction, obtain the support indirectly through calculating along the displacement of bridge direction and along the displacement of horizontal bridge direction, for adopting displacement sensor among the prior art, the installation requirement of sensor has been reduced, the damage of sensor has been avoided, the deformation and the dead condition of card of displacement sensor's pull rod or guide arm can not appear among the prior art, the measuring precision and the life of sensor have been improved.
Drawings
Fig. 1 is a schematic structural diagram of a displacement monitoring device for a bridge bearing according to an embodiment of the present application;
FIG. 2 is a schematic structural view of the displacement monitoring device shown in FIG. 1 installed on a bridge along a bridge direction;
FIG. 3 is a schematic structural view of the displacement monitoring device shown in FIG. 1 installed on a bridge along a transverse direction;
fig. 4 is a schematic flowchart of a displacement monitoring method for a bridge bearing according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of another method for monitoring displacement of a bridge bearer according to an embodiment of the present application.
Description of reference numerals:
a displacement monitoring device 1; a support assembly 11; a base 111; a telescopic link 112; a bushing 1121; a connecting shaft 1122; a rotating member 113; a tilt sensor 12; a support 2; a beam body 3; and a pier 4.
Detailed Description
It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.
The present application will be described in further detail with reference to the following drawings and specific embodiments. The descriptions of "first," "second," etc. in the embodiments of the present application are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description of the embodiments of the present application, "vertical" and "vertical" refer to directions along the gravity direction, and a bridge direction refers to a central axis direction of a bridge, that is, an extending direction of a route; the transverse direction refers to a direction perpendicular to the central axis of the bridge. It is to be understood that such directional terms are merely for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present application.
Referring to fig. 2, the support 2 of the bridge is an important structural component connecting the beam 3 and the pier 4, and is located at the bottom of the beam 3 and at the top of the pier 4, where the top of the pier 4 may be a pier, a cushion or a support base placed on the pier, and the support 4 can reliably transmit the load and deformation (displacement and corner) borne by the beam 3 to the pier 4, and is an important force transmission device of the bridge.
Currently, bridge support displacement monitoring is mainly carried out by adopting direct measurement modes such as a linear type, a pull rope type or a magnetic flux type inclination angle sensor. However, during the conventional displacement measurement, the pull rod or the guide rod of the displacement sensor is easy to deform and block, which has great influence on the displacement measurement precision and the service life of the sensor.
In view of the above, an aspect of the present application provides a bridge bearing displacement monitoring apparatus, please refer to fig. 1 to 3, which includes a support assembly 11 and an inclination sensor 12. The support members 11 are telescopically and multi-rotatably connected between the bottom of the girder 3 and the top of the pier 4. The inclination angle sensor 12 is fixedly arranged on the support component 11 and used for measuring the inclination angle of the support component 11 along the bridge-following direction and the inclination angle of the support component along the transverse bridge-following direction so as to monitor the displacement of the support 2 along the bridge-following direction and the displacement of the support 2 along the transverse bridge-following direction.
Because the displacement of the bridge support along the transverse bridge direction and the longitudinal bridge direction is greatly influenced by temperature, the displacement monitoring of the bridge support is important, and the vertical displacement of the bridge support is 0.1mm in magnitude, so that the processing can be simplified in practice, and the monitoring of the vertical displacement is not needed.
It should be noted that, the support member 11 is retractable, which means that the support member 11 can be at least partially retracted along its own axis. The support component 11 can be connected between the bottom of the beam body 3 and the top of the pier 4 in a multi-way rotating manner, which means that at least part of the support component 11 can rotate in multiple directions, for example, one end of the support component 11 can be connected with the bottom of the beam body 3 in a multi-way rotating manner to form a rotating center, and the other end of the support component 11 can be connected with the top of the pier 4 in a multi-way rotating manner to form another rotating center; alternatively, two rotation centers are present inside the support member 11, one near the bottom of the girder 3 and the other near the top of the pier 4, and the tilt sensor 12 is installed on the support member 11 between the two rotation centers.
This application embodiment is through adopting scalable and multidirectional pivoted supporting component 11, and inclination sensor 12 sets up on supporting component 11, has reduced displacement monitoring device 1's installation required precision, and when support 2 took place the displacement, because supporting component 11 can multidirectional rotation and scalable, supporting component 11 can not be pulled apart, also can not appear the dead condition of displacement sensor card among the prior art.
In one embodiment, the support assembly 1 includes a base 111, a pantograph linkage 112 and a pivot member 113. Bases 111 are arranged at the bottom of the beam body 3 and the top of the pier 4; the fixing manner of the base 111 can be screwing, gluing or welding. The two ends of the telescopic link 112 are respectively connected with a rotating member 113.
Specifically, the telescopic link 112 may include a bushing 1121, a spring, and a connecting shaft 1122; one end of the shaft sleeve 1121 is connected with one rotating part 113, the spring is located in the shaft sleeve 111, one end of the connecting shaft 1122 is located in the shaft sleeve 1121 and connected with the spring, the other end of the connecting shaft 1122 is connected with the other rotating part 113, axial extension and retraction of the connecting shaft 1122 are achieved through extrusion or extension of the spring in the shaft sleeve 1121, deformation of the supporting component 11 when the bridge support 2 is displaced is avoided, and measuring accuracy is improved.
Further, the rotating members 113 at both ends are respectively connected to the corresponding bases 111 in a multi-directional rotatable manner. Specifically, the base 111 and the rotation member 113 are formed with a ball hinge structure, one of the base 111 and the rotation member 113 includes a ball head, and the other of the base 111 and the rotation member 113 includes a groove rotatably coupled with the ball head. For example, the rotation member 113 may be a rotation ball hinge, the rotation ball hinge may be integrally formed with the telescopic link 112, and the base 111 may be a ball hinge base having a groove, and the rotation ball hinge and the ball hinge base cooperate to realize multidirectional rotation of the telescopic link 112.
Further, the tilt sensor 12 is disposed on the support assembly 11, and may be disposed outside or inside the support assembly 11. For example, external or internal, on the pantograph linkage 112. Specifically, the tilt sensor 12 is externally arranged on the telescopic connecting rod 112, so that the installation and maintenance are convenient; the tilt angle sensor 12 and the telescopic connecting rod 112 can be installed in a clamping manner, a gluing manner or a welding manner; for example, the telescopic link 112 may be provided with a mounting groove matching the shape of the tilt sensor 12, and the tilt sensor 12 may be mounted in the mounting groove. The tilt angle sensor 12 can also be installed inside the supporting component 11, so that the rain erosion is avoided, and the service life of the tilt angle sensor 12 is prolonged.
This embodiment is through adopting rotation piece 113, base 111 and telescopic link 112, and the homoenergetic is freely flexible, is rotated when bridge beam supports 2 takes place the displacement to and the cooperation uses inclination sensor 12 to replace displacement sensor, and displacement sensor's connecting rod or guide arm warp, the dead circumstances such as card take place when having avoided among the prior art support 2 displacement measurement, has improved measurement accuracy, and the erection measurement is convenient, easy to maintain changes, and the durability is good.
In one embodiment, the tilt sensor 12 may be a dual-axis tilt sensor. Use the biax sensor, can measure supporting component 11 simultaneously along the ascending inclination of following the bridge to and along the ascending inclination of horizontal bridge to the displacement of monitoring support 2 along following the bridge to and horizontal bridge has reduced the construction process, has reduced monitoring cost.
In one embodiment, the tilt sensor 12 may be a single axis sensor. When using the single-axis sensor, set up two single-axis sensors on a supporting component 11, or set up a single-axis sensor respectively on different supporting components 11 respectively, measure supporting component 11 along the inclination of bridge direction and along the inclination of horizontal bridge direction respectively to monitor support 2 along the displacement of bridge direction and along the displacement of horizontal bridge direction. In an embodiment, the tilt sensor 12 includes a sensing module, a storage module, a communication module and a battery, the sensing module is sequentially connected to the storage module and the communication module, the battery is electrically connected to the sensing module, the storage module and the communication module, and the communication module can store information monitored by the sensing module in the storage module and transmit the information back to the monitoring system server through the communication module to determine the security of the bridge support 2. The tilt sensor 12 may be a wireless sensor or a wired sensor.
In one embodiment, the base 111, the telescopic link 112 and the rotation member 113 are rigid members, and the base 111, the telescopic link 112 and the rotation member 113 are not displaced or deformed relative to each other, so as to improve the monitoring accuracy. For example, the rigid part can be cast steel, so that the bearing capacity is increased, and the measurement accuracy is improved.
In one embodiment, the surfaces of the base 111, the rotating member 112, and the rotating member 113 are coated with corrosion-resistant coatings to prevent rain erosion and improve measurement accuracy.
In another aspect, the present embodiment provides a displacement monitoring method for a bridge bearing, referring to fig. 4, where the displacement monitoring method includes:
s1: acquiring the vertical distance between two rotation centers of the support assembly;
s2: acquiring an inclination angle of the supporting component along the forward bridge direction and an inclination angle of the supporting component along the transverse bridge direction, which are measured by an inclination angle sensor at a certain moment;
s3: and calculating to obtain the displacement of the support along the forward bridge direction and the displacement along the transverse bridge direction at the moment. According to the displacement monitoring method provided by the embodiment, on the basis that the vertical displacement change between the beam body 3 and the pier 4 can be ignored, the displacement of the support 2 along the bridge direction and the displacement along the transverse bridge direction can be calculated by acquiring the vertical distance H between the two rotation centers of the support assembly 11, the inclination angle theta x of the support assembly 11 along the bridge direction and the inclination angle theta y of the support assembly 11 along the transverse bridge direction, and the displacement monitoring method is simple and efficient.
In one embodiment, the support assembly 11 is vertically mounted between the bottom of the beam 3 and the top of the pier 4. So set, the initial angle of the tilt sensor 12 is zero. To calculate the displacement change of the support 2 at a certain time, the real-time tilt angle measured by the tilt angle sensor 12 at the time is obtained, and the calculation is performed through a simple trigonometric function. For example, the displacement of the support in the forward direction and the displacement in the transverse direction at this time can be calculated according to the following functional relationships:
Sx＝H×tanθx
Sy＝H×tanθy
wherein S isxFor displacement of the support in the direction of the bridge, SyFor the displacement of the support in the transverse direction, H is the vertical distance between the two centers of rotation of the support assembly, θxThe inclination angle, theta, of the support member in the direction of the bridge, measured by the inclination sensor at a timeyThe inclination angle of the supporting component along the transverse bridge direction is measured by the inclination angle sensor at a certain moment.
In an embodiment, referring to fig. 5, the support assembly 11 is installed between the bottom of the beam 3 and the top of the pier 4, and the support assembly 11 is not required to be vertical, so that the installation accuracy requirement of the support assembly 11 can be reduced, and the installation efficiency can be improved. In this case, the displacement monitoring method further includes: s4, acquiring the initial angle of the supporting component along the bridge direction and the initial angle along the transverse bridge direction measured by the inclination angle sensor. S4 is located between steps S1 and S2.
For example, the displacement of the support in the forward bridge direction and the displacement in the transverse bridge direction at a certain moment can be calculated according to the following functional relations:
Sx＝H×(tanθx-tanθx0)
Sy＝H×(tanθy-tanθy0)
wherein S isxFor displacement of the support in the direction of the bridge, SyFor the displacement of the support in the transverse direction, H is the vertical distance between the two centers of rotation of the support assembly, θx0An initial angle, θ, of the support assembly along the downbridge direction measured for the tilt sensory0Initial angle, θ, of the support assembly in the transverse bridge direction measured for the tilt sensorxThe inclination angle, theta, of the support member in the direction of the bridge, measured by the inclination sensor at a timeyThe inclination angle of the supporting component along the transverse bridge direction is measured by the inclination angle sensor at a certain moment.
It is understood that, in this embodiment, the upper and lower bases 111 of the support assembly 11 may not be located on the same vertical line, and the bases 111 may be horizontally disposed or not.
The mounting method of the displacement monitoring device of the embodiment can reduce the mounting requirement and mounting precision of the base 111, save the mounting cost and reduce the procedures implemented on site.
In one embodiment, the displacement of one support 2 is monitored, the number of the displacement monitoring devices 1 used may be plural, and a plurality of the displacement monitoring devices 1 may be arranged on the peripheral side of the support 2. For example, when the displacement monitoring device 1 is plural, the average value of plural monitoring data can be taken, so as to avoid the influence of errors and improve the accuracy of measurement. Specifically, a plurality of displacement monitoring devices 1 are disposed on the periphery of one support 2, and the displacement monitoring method in this embodiment includes:
acquiring the vertical distance between two rotation centers of each support assembly;
acquiring the inclination angle of the support assembly along the bridge direction and the inclination angle of the support assembly along the transverse bridge direction, which are measured by each inclination angle sensor at a certain moment;
and calculating each displacement monitoring device to obtain the displacement of the support along the forward bridge direction and the displacement along the transverse bridge direction at the moment, and averaging.
The above description is only a preferred embodiment of the present application, and is not intended to limit the present application, and it is obvious to those skilled in the art that various modifications and variations can be made in the present application. All changes, equivalents, modifications and the like which come within the spirit and principle of the application are intended to be embraced therein.
Claims (10)
1. A displacement monitoring device of a bridge bearing is characterized by comprising:
the supporting component can be connected between the bottom of the beam body and the top of the pier in a telescopic and multi-direction rotating manner; and
the inclination angle sensor is fixedly arranged on the supporting component and used for measuring the inclination angle of the supporting component along the bridge direction and the inclination angle along the transverse bridge direction so as to monitor the displacement of the support along the bridge direction and the displacement along the transverse bridge direction.
2. The displacement monitoring device of claim 1, wherein the support assembly comprises a base, a telescopic connecting rod and a rotating member, and the base is fixedly arranged on the bottom of the beam body and the top of the pier; the two ends of the telescopic connecting rod are respectively connected with the rotating piece, the rotating pieces at the two ends are respectively connected with the corresponding base in a multidirectional rotating mode, and the inclination angle sensor is arranged on the telescopic connecting rod.
3. The displacement monitoring device of claim 2, wherein the tilt sensor is externally mounted on the pantograph linkage.
4. The displacement monitoring device of claim 2, wherein the base and the rotating member are configured in a ball-and-socket arrangement, one of the base and the rotating member including a ball head, and the other of the base and the rotating member including a groove rotatably coupled to the ball head.
5. The displacement monitoring device of claim 2, wherein the base, the pantograph linkage and the rotary member are each rigid members; and/or the presence of a gas in the gas,
the base, the telescopic link and the rotating member all have a corrosion resistant coating.
6. The displacement monitoring device of claim 2, wherein the base is fixedly attached by screwing, gluing or welding.
7. The displacement monitoring device of any one of claims 1 to 6, wherein the tilt sensor is a dual-axis tilt sensor.
8. A displacement monitoring method of a bridge bearing, which is characterized in that the displacement monitoring device of any one of claims 1 to 7 is used, and the displacement monitoring method comprises the following steps:
acquiring the vertical distance between two rotation centers of the support assembly;
acquiring an inclination angle of the supporting component along the forward bridge direction and an inclination angle of the supporting component along the transverse bridge direction, which are measured by the inclination angle sensor at a certain moment;
and calculating to obtain the displacement of the support along the forward bridge direction and the displacement along the transverse bridge direction at the moment.
9. The displacement monitoring method according to claim 8, further comprising:
and acquiring an initial angle of the support assembly measured by the tilt angle sensor along the forward bridge direction and an initial angle of the support assembly measured by the tilt angle sensor along the transverse bridge direction.
10. The displacement monitoring method according to claim 9, wherein the step of calculating the displacement of the support along the forward bridge direction and the displacement along the transverse bridge direction at the time is to calculate the displacement of the support along the forward bridge direction and the displacement along the transverse bridge direction at the time according to the following functional relations:
Sx＝H×(tanθx-tanθx0)
Sy＝H×(tanθy-tanθy0)
wherein S isxFor displacement of the support in the direction of the bridge, SyFor the displacement of the support in the transverse direction, H is the vertical distance between the two centers of rotation of the support assembly, θx0An initial angle, θ, of the support assembly along the downbridge direction measured for the tilt sensory0Initial angle, θ, of the support assembly in the transverse bridge direction measured for the tilt sensorxThe inclination angle, theta, of the support member in the direction of the bridge, measured by the inclination sensor at a timeyThe inclination angle of the supporting component along the transverse bridge direction is measured by the inclination angle sensor at a certain moment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111481086.0A CN114322880A (en) | 2021-12-06 | 2021-12-06 | Displacement monitoring device and displacement monitoring method for bridge support |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111481086.0A CN114322880A (en) | 2021-12-06 | 2021-12-06 | Displacement monitoring device and displacement monitoring method for bridge support |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201037764Y (en) * | 2007-04-12 | 2008-03-19 | 中国矿业大学 | Displacement sensor for measuring gap of brake block |
| CN102252590A (en) * | 2010-05-21 | 2011-11-23 | 喻继远 | Displacement distance sensor for clutch brake of press machine |
| CN107462199A (en) * | 2017-08-08 | 2017-12-12 | 武汉理工光科股份有限公司 | A kind of scalable anti-offset lossless support displacement monitoring device |
| CN207231440U (en) * | 2017-10-12 | 2018-04-13 | 湖南联智桥隧技术有限公司 | A kind of bridge pad monitoring device |
-
2021
- 2021-12-06 CN CN202111481086.0A patent/CN114322880A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201037764Y (en) * | 2007-04-12 | 2008-03-19 | 中国矿业大学 | Displacement sensor for measuring gap of brake block |
| CN102252590A (en) * | 2010-05-21 | 2011-11-23 | 喻继远 | Displacement distance sensor for clutch brake of press machine |
| CN107462199A (en) * | 2017-08-08 | 2017-12-12 | 武汉理工光科股份有限公司 | A kind of scalable anti-offset lossless support displacement monitoring device |
| CN207231440U (en) * | 2017-10-12 | 2018-04-13 | 湖南联智桥隧技术有限公司 | A kind of bridge pad monitoring device |
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