Extended-range bridge expansion joint displacement monitor

Abstract

The invention relates to the technical field of bridge displacement monitoring, and discloses an extended-range bridge expansion joint displacement monitor, which comprises two horizontally adjacent beam bodies and an expansion joint arranged between the two beam bodies, and further comprises a fixed block fixed on the left beam body; the monitoring box is fixed on the right side beam body; one end of the connecting rod is mounted on one side, facing the monitoring box, of the fixing block, and the other end extends into the monitoring box and is connected with a measuring plate through a range extending mechanism; the infrared distance measuring sensor is fixedly installed on the inner side wall of the monitoring box, faces the measuring plate and is used for measuring the distance between the infrared distance measuring sensor and the measuring plate. According to the extended-range bridge expansion joint displacement monitor, the displacement stroke of the expansion joint is amplified through the extended-range mechanism, and infinitesimal displacement is converted into displacement change with a larger amplitude, so that the measurement precision of the laser distance measuring sensor is remarkably improved, and the measurement error is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge displacement monitoring, and in particular to an extended-range bridge expansion joint displacement monitor. Background Art

[0002] As an important infrastructure, the long-term safety and stability of bridge operation are of great significance to transportation and socio-economic development. During the operation of the bridge, due to temperature changes, traffic loads, foundation settlement and other external environmental influences, the bridge structure will have certain displacement and deformation. As the key connecting component between the bridge beams, the expansion joints have the important functions of absorbing the relative displacement of the beams, alleviating structural deformation and protecting the overall performance of the bridge. Therefore, real-time monitoring of the expansion joint displacement can effectively warn of potential risks in bridge operation, which is very necessary.

[0003] For example, in Chinese patent CN115289978B, a real-time monitoring device for the displacement of bridge expansion joints is provided, which solves the problem that the displacement of bridge expansion joints is monitored by the naked eye or spacing measuring devices at intervals, and the existing embedded devices are easily damaged by external sand or debris entering the expansion joints. The structure is sophisticated and very practical.

[0004] However, in practical applications, we found that the above and traditional bridge expansion joint displacement monitoring devices still have certain shortcomings:

[0005] The displacement amplitude of expansion joints is usually small, and conventional monitoring devices (such as displacement sensors or laser ranging equipment) are difficult to accurately capture these tiny displacements, resulting in insufficient measurement accuracy. If ultra-high precision sensors are used, it will not only be costly, but also have strict requirements on the use environment and be easily affected by dust, moisture or high vibration environment. At the same time, it consumes a lot of energy and is difficult to meet the needs of long-term reliable monitoring. Summary of the invention

[0006] (1) Technical issues solved

[0007] In view of the deficiencies in the prior art, the present invention provides an extended-range bridge expansion joint displacement monitor, which has the advantage of being able to improve monitoring accuracy by amplifying displacement.

[0008] (II) Technical solution

[0009] In order to achieve the above-mentioned purpose of improving monitoring accuracy by amplifying displacement, the present invention provides the following technical solution: an extended-range bridge expansion joint displacement monitor, comprising two horizontally adjacent beam sections and an expansion joint disposed between the two beam sections, and further comprising:

[0010] A fixed block, fixed on the left beam body;

[0011] Monitoring box, fixed on the right beam;

[0012] A connecting rod, one end of which is mounted on the side of the fixed block facing the monitoring box, and the other end of which extends into the interior of the monitoring box and is connected to the measuring plate through the range extension mechanism; and

[0013] The infrared distance measuring sensor is fixedly mounted on the inner wall of the monitoring box and faces the measuring plate, and is used to measure the distance between it and the measuring plate.

[0014] As a preferred technical solution of the present invention, side wings are fixedly mounted on the outer walls of the fixing block and the monitoring box, bolt holes are opened on the side wings, and expansion bolts pass through the bolt holes to fix the side wings on the beam body.

[0015] As a preferred technical solution of the present invention, the range-extending mechanism comprises a range-extending plate, a middle rod, a first articulated rod, a first articulated seat, a second articulated rod and a second articulated seat;

[0016] The end of the connecting rod extends into the monitoring box and is fixedly connected to the range extender board. Two X-shaped cross middle rods are rotatably installed in the middle of the side of the range extender board through the positioning shaft. The end of the middle rod facing away from the measuring plate is hinged with a hinge rod 1, and the other end of the hinge rod 1 is rotatably installed on a hinge seat 1, and the hinge seat 1 is fixedly installed on the inner wall of the monitoring box;

[0017] One end of the middle rod facing the measuring plate is hinged with a hinge rod 2, the other end of the hinge rod 2 is rotatably mounted on a hinge seat 2, and the hinge seat 2 is fixedly mounted on the measuring plate.

[0018] As a preferred technical solution of the present invention, a stabilizing rod is fixedly mounted on the side of the measuring plate facing the range extender plate, and the stabilizing rod is movably inserted on the range extender plate.

[0019] As a preferred technical solution of the present invention, two baffles are fixedly mounted on the stabilizing rod, and the two baffles are respectively arranged on both sides of the range extender.

[0020] As a preferred technical solution of the present invention, an annular pressure sensor is fixedly installed on the opposite sides of the two baffles;

[0021] It also includes two force springs, which are sleeved on the stabilizing rod and are respectively arranged on both sides of the range extender plate, and are used to apply pressure on the annular pressure sensor;

[0022] The output end of the annular pressure sensor is electrically connected to a controller, and the output end of the controller is electrically connected to the input end of the infrared ranging sensor.

[0023] As a preferred technical solution of the present invention, an inner plate is fixedly installed on one end of the connecting rod facing away from the monitoring box, and the inner plate is movably arranged in an inner cavity opened inside the fixed block and supported by a supporting spring.

[0024] As a preferred technical solution of the present invention, a regulating plate is movably arranged in the inner cavity, and the supporting spring is arranged between the regulating plate and the inner plate.

[0025] As a preferred technical solution of the present invention, a threaded rod is rotatably mounted on the fixing block via a bearing, and the regulating plate is threadedly connected to the threaded rod.

[0026] (III) Beneficial effects

[0027] Compared with the prior art, the present invention provides an extended-range bridge expansion joint displacement monitor, which has the following beneficial effects:

[0028] 1. The extended-range bridge expansion joint displacement monitor amplifies the expansion joint displacement stroke through the range-extending mechanism, converting small displacements into larger displacement changes, thereby significantly improving the measurement accuracy of the laser ranging sensor and reducing the measurement error.

[0029] 2. The extended-range bridge expansion joint displacement monitor can filter out tiny vibrations on demand through adjustable support springs, avoid interference from meaningless or tiny displacement signals, avoid redundancy in monitoring data, and improve the stability and accuracy of data monitoring.

[0030] 3. The extended-range bridge expansion joint displacement monitor reduces the dependence on high-precision sensors and reduces the overall cost of the equipment through a simple and reliable structural design. It also has good environmental adaptability, can operate stably for a long time under harsh conditions, and is suitable for a variety of bridge environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0033] Figure 3 It is a cross-sectional view of the overall structure of the present invention;

[0034] Figure 4 It is a cross-sectional view of the fixing block part of the present invention;

[0035] Figure 5 It is an enlarged schematic diagram of the stabilizing rod portion of the present invention;

[0036] Figure 6 A schematic diagram of another monitoring method of the present invention;

[0037] Figure 7 It is a schematic diagram of signal transmission of the present invention.

[0038] In the figure: 1. fixing block; 2. monitoring box; 3. wing; 4. connecting rod; 5. measuring plate; 6. infrared ranging sensor; 7. range extender board; 8. middle rod; 9. articulated rod one; 10. articulated seat one; 11. articulated rod two; 12. articulated seat two; 13. stabilizing rod; 14. baffle; 15. annular pressure sensor; 16. force spring; 17. inner plate; 18. inner cavity; 19. support spring; 20. regulating plate; 21. threaded rod; 22. knob. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] See also Figure 1 -

[0042] Figure 3 An extended-range bridge expansion joint displacement monitor includes two horizontally adjacent beams and an expansion joint between the two beams. A fixing block 1 is fixed on the left beam, and a monitoring box 2 is fixed on the right beam. Specifically, Figure 1 As shown, side wings 3 are fixedly mounted on the outer walls of the fixing block 1 and the monitoring box 2. Bolt holes are opened on the side wings 3. Expansion bolts pass through the bolt holes to fix the side wings 3 on the beam body, thereby installing the fixing block 1 and the monitoring box 2.

[0043] like Figure 2 As shown, one end of the connecting rod 4 is installed on the side of the fixed block 1 facing the monitoring box 2, and the other end extends to the interior of the monitoring box 2 and is connected to the measuring plate 5 through the range extension mechanism. The infrared ranging sensor 6 is fixedly installed on the inner wall of the monitoring box 2 and faces the measuring plate 5, and is used to measure the distance between it and the measuring plate 5, thereby monitoring the displacement change of the expansion joint.

[0044] The design of the range extender mechanism is as follows: Figure 2 and Figure 3As shown, it includes a range-extending plate 7, a middle rod 8, an articulated rod 19, an articulated seat 10, an articulated rod 2 11 and an articulated seat 2 12. Specifically, the end of the connecting rod 4 extends into the monitoring box 2 and is fixedly connected to the range-extending plate 7. Two X-shaped cross middle rods 8 are rotatably installed in the middle part of the side of the range-extending plate 7 through a positioning axis. The end of the middle rod 8 facing away from the measuring plate 5 is hinged to an articulated rod 19, and the other end of the articulated rod 19 is rotatably installed on an articulated seat 10. The articulated seat 10 is fixedly installed on the inner side wall of the monitoring box 2. The end of the middle rod 8 facing the measuring plate 5 is hinged to an articulated rod 2 11. The articulated rod 2 11 is The other end is rotatably mounted on the articulated seat 2 12, and the articulated seat 2 12 is fixedly mounted on the measuring plate 5. Through the above structure, when the connecting rod 4 produces a small displacement, the range-extending plate 7 will significantly amplify the displacement stroke and transmit it to the measuring plate 5 through the cross-amplification effect of the middle rod 8, so that the infrared ranging sensor 6 can accurately measure the displacement change. Specifically, the connecting rod 4 drives the range-extending plate 7 to move, and the measuring plate 5 can move twice as much as the range-extending plate 7 to amplify the stroke and convert small displacement into larger displacement, which significantly improves the measurement accuracy of the laser ranging sensor and reduces the measurement error.

[0045] like Figure 2 As shown, a stabilizing rod 13 is fixedly mounted on one side of the measuring plate 5 facing the range extending plate 7. The stabilizing rod 13 is movably inserted on the range extending plate 7 to provide auxiliary support when the range extending mechanism is working, thereby ensuring the stability and stability of the device during the measurement process.

[0046] Embodiment 2:

[0047] See also Figure 3 , Figure 5 and Figure 7 On the basis of the first embodiment, in this embodiment, two baffles 14 are fixedly mounted on the stabilizing rod 13, the two baffles 14 are respectively arranged on both sides of the range extender 7, and an annular pressure sensor 15 is fixedly mounted on opposite sides of the two baffles 14;

[0048] Two force springs 16 are also provided, which are sleeved on the stabilizing rod 13 and are respectively provided on both sides of the range extender plate 7, and are used to apply pressure on the annular pressure sensor 15. The output end of the annular pressure sensor 15 is electrically connected to the controller, and the output end of the controller is electrically connected to the input end of the infrared ranging sensor 6;

[0049] When the expansion joint does not displace, the range extender plate 7 is in the initial position (the middle position of the range extender mechanism), and the two force springs 16 are not compressed; when the expansion joint is displaced, the force spring 16 is compressed through the deformation of the range extender mechanism, and pressure is applied to the annular pressure sensor 15 through the force spring 16, so that the annular pressure sensor 15 is triggered. When the annular pressure sensor 15 is triggered, the infrared ranging sensor 6 is restarted through the controller to realize intelligent monitoring and avoid energy waste caused by invalid monitoring. The infrared ranging sensor 6 does not have to be in the on state all the time.

[0050] Embodiment three:

[0051] See also Figure 4 On the basis of the first or second embodiment, in the present embodiment, an inner plate 17 is fixedly mounted on one end of the connecting rod 4 facing away from the monitoring box 2. The inner plate 17 is movably arranged in an inner cavity 18 opened inside the fixed block 1 and supported by a support spring 19. The support spring 19 can absorb small vibrations and small disturbances of the expansion joint, avoid frequent response of the range-extending mechanism to meaningless small displacements, avoid redundancy of monitoring data, and improve the stability and accuracy of data monitoring.

[0052] Furthermore, a regulating plate 20 is movably arranged in the inner cavity 18, a support spring 19 is arranged between the regulating plate 20 and the inner plate 17, a threaded rod 21 is rotatably mounted on the fixed block 1 through a bearing, the regulating plate 20 is threadedly connected to the threaded rod 21, and a knob 22 is fixedly connected to the other end of the threaded rod 21;

[0053] By rotating the threaded rod 21, the position of the control plate 20 can be adjusted, and then the preload force of the support spring 19 can be adjusted to meet the monitoring requirements of different displacement amplitudes and environments.

[0054] Embodiment 4:

[0055] On the basis of the first embodiment, in this embodiment, the fixing block 1 and the monitoring box 2 are provided in two groups, such as Figure 6 As shown, two fixed blocks 1 are fixedly connected (the fixed blocks 1 are not installed on the beam body), and two monitoring boxes 2 are fixedly installed on the two sections of the beam body respectively, and the whole is in an "L" shape. In this way, the horizontal displacement and the vertical displacement of the expansion joint can be monitored at the same time, expanding the monitoring range.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extended-range bridge expansion joint displacement monitor, comprising two horizontally adjacent beam sections and an expansion joint disposed between the two beam sections, characterized in that: Also includes: A fixing block (1), fixed on the left beam body; A monitoring box (2) is fixed on the right beam; A connecting rod (4), one end of which is mounted on a side of the fixed block (1) facing the monitoring box (2), and the other end of which extends into the interior of the monitoring box (2) and is connected to a measuring plate (5) via a range-extending mechanism; and The infrared distance measuring sensor (6) is fixedly mounted on the inner wall of the monitoring box (2) and faces the measuring plate (5), and is used to measure the distance between the infrared distance measuring sensor and the measuring plate (5).

2. The extended-range bridge expansion joint displacement monitor according to claim 1, characterized in that: Side wings (3) are fixedly mounted on the outer walls of the fixing block (1) and the monitoring box (2), and bolt holes are provided on the side wings (3). Expansion bolts pass through the bolt holes to fix the side wings (3) on the beam body.

3. The extended-range bridge expansion joint displacement monitor according to claim 1, characterized in that: The range-extending mechanism comprises a range-extending plate (7), a middle rod (8), a first hinged rod (9), a first hinged seat (10), a second hinged rod (11) and a second hinged seat (12); The end of the connecting rod (4) extends into the monitoring box (2) and is fixedly connected to the range extender plate (7); two X-shaped cross middle rods (8) are rotatably mounted in the middle of the side of the range extender plate (7) via a positioning shaft; one end of the middle rod (8) facing away from the measuring plate (5) is hinged to a hinge rod (9); the other end of the hinge rod (9) is rotatably mounted on a hinge seat (10); and the hinge seat (10) is fixedly mounted on the inner wall of the monitoring box (2); One end of the middle rod (8) facing the measuring plate (5) is hingedly connected to a second hinge rod (11), the other end of the second hinge rod (11) is rotatably mounted on a second hinge seat (12), and the second hinge seat (12) is fixedly mounted on the measuring plate (5).

4. The extended-range bridge expansion joint displacement monitor according to claim 3 is characterized by: A stabilizing rod (13) is also fixedly mounted on one side of the measuring plate (5) facing the range extending plate (7), and the stabilizing rod (13) is movably inserted on the range extending plate (7).

5. The extended-range bridge expansion joint displacement monitor according to claim 4 is characterized in that: Two baffles (14) are fixedly mounted on the stabilizing rod (13), and the two baffles (14) are respectively arranged on both sides of the range extender plate (7).

6. The extended-range bridge expansion joint displacement monitor according to claim 5, characterized in that: An annular pressure sensor (15) is fixedly mounted on opposite sides of the two baffles (14); It also includes two force springs (16) which are sleeved on the stabilizing rod (13) and are respectively arranged on both sides of the range extender plate (7) and are used to apply pressure on the annular pressure sensor (15); The output end of the annular pressure sensor (15) is electrically connected to a controller, and the output end of the controller is electrically connected to the input end of the infrared distance measuring sensor (6).

7. An extended-range bridge expansion joint displacement monitor according to any one of claims 1 to 6, characterized in that: An inner plate (17) is fixedly mounted on one end of the connecting rod (4) facing away from the monitoring box (2); the inner plate (17) is movably arranged in an inner cavity (18) opened inside the fixed block (1) and supported by a supporting spring (19).

8. The extended-range bridge expansion joint displacement monitor according to claim 7, characterized in that: A regulating plate (20) is movably arranged in the inner cavity (18), and the supporting spring (19) is arranged between the regulating plate (20) and the inner plate (17).

9. The extended-range bridge expansion joint displacement monitor according to claim 8, characterized in that: A threaded rod (21) is rotatably mounted on the fixed block (1) via a bearing, and the regulating plate (20) is threadedly connected to the threaded rod (21).

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