Displacement detection device and detection system for bridge expansion joint

Abstract

The utility model discloses a bridge expansion joint displacement detection device and detection system, and the device comprises a detection rod and a protection sleeve with one end provided with an opening. One end of the detection rod is inserted into the protective sleeve in a sliding and sealing manner, a laser displacement sensor is fixedly mounted at the end, located in the protective sleeve, of the detection rod, and a reflection part right opposite to the laser displacement sensor is arranged in the protective sleeve; the end, away from the detection rod, of the protection sleeve is fixedly sleeved with a sleeve in a sealed mode, a first cavity is formed between the sleeve and the protection sleeve, a first through hole communicated with the first cavity is formed in the sleeve, and a second through hole communicated with the first cavity is formed in the protection sleeve. According to the utility model, the bridge expansion joint can be detected in real time, and the detection efficiency and precision are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge safety detection, in particular to a displacement detection device and a detection system for bridge expansion joints. Background Art

[0002] Bridges are a vital part of modern transportation infrastructure and have a significant impact on urban economic and social development and people's daily lives. In order to ensure the safety, stability and durability of bridge structures, real-time detection of the health of bridges is essential. Bridge expansion joints are an important part of bridge design, requiring them to be able to freely expand and contract in directions parallel and perpendicular to the bridge axis. The displacement change of expansion joints will affect the service life and performance of the bridge. Monitoring the displacement of expansion joints is an important part of bridge maintenance work. The current main observation method is to have inspectors standing on the bridge deck make visual judgments and identifications, which can only qualitatively judge the condition of expansion joints, are prone to misjudgment, and cannot detect the displacement of expansion joints in real time. Utility Model Content

[0003] The utility model aims to provide a displacement detection device for a bridge expansion joint to solve the deficiencies in the prior art, and can realize real-time detection of the bridge expansion joint.

[0004] The utility model provides a displacement detection device for bridge expansion joints, which comprises a detection rod and a protective sleeve with an opening at one end;

[0005] One end of the detection rod is slidably and sealedly inserted in the protective sleeve, and a laser displacement sensor is fixedly installed on the end of the detection rod located in the protective sleeve. A reflecting part facing the laser displacement sensor is provided in the protective sleeve; a sleeve is sealed and fixedly sleeved on the end of the protective sleeve away from the detection rod, and a first cavity is formed between the sleeve and the protective sleeve, a first through hole connected to the first cavity is opened on the sleeve, and a second through hole connected to the first cavity is opened on the protective sleeve.

[0006] A device for detecting displacement of expansion joints of bridges as described above, wherein preferably, the reflecting part is a reflecting plate having the same inner diameter as the protective sleeve, the reflecting plate is fixedly mounted on the inner wall of the protective sleeve, and the center line of the reflecting plate coincides with the center line of the protective sleeve, the reflecting plate is located between the second through hole and the laser displacement sensor, and a vent is provided on the reflecting plate.

[0007] A device for detecting displacement of a bridge expansion joint as described above, wherein preferably, an elastic membrane is provided in the first cavity, the elastic membrane is arranged along the circumference of the protective sleeve, the elastic membrane and the outer wall of the protective sleeve are sealed to form a second cavity, and the second cavity is connected to the protective sleeve through the second through hole.

[0008] As described above, a device for detecting displacement of a bridge expansion joint, wherein preferably, an accommodating groove is provided on the inner side wall of the open end of the protective sleeve, the accommodating groove is arranged along the circumferential direction of the protective sleeve, and a sealing ring is installed in the accommodating groove.

[0009] A device for detecting displacement of expansion joints of bridges as described above, wherein preferably, a cleaning ring is fixedly mounted on the open end of the protective sleeve, bristles are provided on the inner wall of the cleaning ring, and one end of the bristles away from the cleaning ring abuts against the detection rod.

[0010] In the above-mentioned device for detecting displacement of bridge expansion joints, preferably, a limiting ring is further provided on the outer periphery of the detection rod, and the limiting ring is arranged at an end away from the laser displacement sensor.

[0011] A device for detecting displacement of a bridge expansion joint as described above, wherein, preferably, it also includes a first mounting seat and a second mounting seat; the end of the detection rod away from the laser displacement sensor is hinged to the first mounting seat; the sealing end of the protective sleeve is hinged to the second mounting seat; the hinge center line of the detection rod and the first mounting seat, and the hinge center line of the protective sleeve and the second mounting seat are parallel, and both are perpendicular to the axis of the detection rod.

[0012] The utility model also provides a bridge expansion joint displacement detection system, which includes a plurality of detection devices as described above, a wireless transmission module and a remote server; the detection device is electrically connected to the wireless transmission module; the wireless transmission module is fixedly mounted on the detection device, and the wireless transmission module is communicatively connected to the remote server.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model can realize real-time detection of bridge expansion joints, which is convenient for staff to grasp the status of expansion joints in real time and formulate bridge maintenance plans.

[0015] 2. The utility model can effectively protect the laser displacement sensor by slidingly sleeved one end of the detection rod provided with the laser displacement sensor in the protective sleeve to prevent the laser displacement sensor from being directly exposed to the air; a sleeve is provided on the protective sleeve, a first through hole is provided on the sleeve, and a second through hole is provided on the protective sleeve, which can ensure that the detection rod can slide more smoothly in the protective sleeve and can also effectively prevent rainwater from entering the protective sleeve.

[0016] 3. The utility model provides an elastic membrane in the first cavity formed between the sleeve and the protective sleeve, which can effectively prevent dust and water vapor from entering the protective sleeve, while ensuring smooth sliding between the detection rod and the protective sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a device for detecting displacement of a bridge expansion joint in Embodiment 1 of the utility model;

[0018] Figure 2 yes Figure 1 A cross-sectional view of

[0019] Figure 3 It is a schematic diagram of the structure of the detection rod;

[0020] Figure 4 It is a schematic diagram of the structure of the protective sleeve and the casing in the first embodiment;

[0021] Figure 5 is a cross-sectional view of the protective sleeve in the second embodiment;

[0022] Figure 6 It is a structural schematic diagram of a displacement detection device for bridge expansion joints in Embodiment 3 of the present utility model;

[0023] Figure 7 yes Figure 6 Schematic diagram of the structure from another perspective.

[0024] Description of reference numerals:

[0025] 1-detection rod, 2-protective sleeve, 3-laser displacement sensor, 4-sleeve, 5-reflecting part, 6-first cavity, 41-first through hole, 21-second through hole, 22-accommodating groove, 51-vent, 7-elastic membrane, 8-second cavity, 9-sealing ring, 10-cleaning ring, 11-brush, 12-limiting ring, 13-first mounting seat, 14-second mounting seat, 15-first mounting plate, 16-second mounting plate, 17-third mounting plate, 18-fourth mounting plate, 19-first mounting hole, 23-first connecting ear, 24-connecting shaft, 25-second connecting ear, 161-second mounting hole. DETAILED DESCRIPTION

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] Embodiment 1 of the present utility model: Figure 1-Figure 4 As shown, the utility model proposes a displacement detection device for a bridge expansion joint, comprising a detection rod 1 and a protective sleeve 2 with an opening at one end; a laser displacement sensor 3 is installed at one end of the detection rod 1. As an implementation method, a mounting groove can be opened at the end of the detection rod along its axial direction, and the laser displacement sensor 3 can be fixedly installed in the mounting groove; as another implementation method, the laser displacement sensor 3 can also be designed to be the same shape as the detection rod, and then the laser displacement sensor 3 can be installed at one end of the detection rod 1.

[0028] One end of the detection rod 1 on which the laser displacement sensor 3 is installed is slidably sealed and inserted in the protective sleeve 2. By providing the protective sleeve 2, the laser displacement sensor 3 is prevented from being directly exposed to the air, and the laser displacement sensor 3 can be effectively protected; a reflecting part 5 is provided in the protective sleeve 2, which is directly opposite to the laser displacement sensor 3. The laser emitted by the transmitting end of the laser displacement sensor 3 is reflected by the reflecting part 5 and received by the receiving end of the laser displacement sensor 3, so that the distance between the laser displacement sensor 3 and the reflecting part 5 can be measured; a sleeve 4 is sealed and fixedly sleeved on the end of the protective sleeve 2 away from the detection rod 1, and a first cavity 6 is formed between the sleeve 4 and the protective sleeve 2, and a first through hole 41 connected to the first cavity 6 is opened on the sleeve 4, and a second through hole 21 connected to the first cavity 6 is opened on the protective sleeve 2. By providing the first through hole 41 and the second through hole 21, the inside of the protective sleeve 2 can be connected with the outside, so that the sliding between the detection rod 1 and the protective sleeve 2 can be smoother. The provision of the sleeve 4 can prevent rainwater from entering the protective sleeve 2 through the second through hole 21 and affecting the laser displacement sensor 3 , thereby improving the measurement accuracy and service life of the laser displacement sensor 3 .

[0029] The maximum value of the relative displacement change between the detection rod 1 and the protective sleeve 2 is greater than the limit value of the width change of the expansion joint of the detected bridge. That is, when the width of the expansion joint of the detected bridge exceeds the limit value, the bridge is broken.

[0030] When in use, the end of the detection rod 1 away from the laser displacement sensor 3 is connected to one side of the bridge expansion joint, and the sealed end of the protective sleeve 2 is connected to the other side of the bridge expansion joint. At this time, the first through hole 41 is located below the sleeve 4, which makes it easier to prevent rainwater from entering the first cavity 6 when it rains. When the bridge expansion joint is displaced, relative sliding occurs between the detection rod 1 and the protective sleeve 2, and the distance between the laser displacement sensor 3 and the reflecting part 5 changes, thereby obtaining the change in the expansion joint width, thereby achieving real-time detection of the bridge expansion joint.

[0031] As an implementation method, the reflecting part 5 is a reflecting plate with the same inner diameter as the protective sleeve 2. The reflecting plate is fixedly mounted on the inner wall of the protective sleeve 2, and the center line of the reflecting plate coincides with the center line of the protective sleeve 2. The reflecting plate is located between the second through hole 21 and the laser displacement sensor 3. Such a setting can further play a protective role and reduce the influence of external dust on the laser displacement sensor 3.

[0032] A vent hole 51 is provided on the reflective plate, and a plurality of vent holes 51 can be provided. The plurality of vent holes 51 are arranged along the circumferential direction of the reflective plate. To prevent the vent holes 51 from affecting the laser emitted by the laser displacement sensor 3 and affecting the receiving end of the laser displacement sensor 3 from receiving the laser reflected by the reflective plate, the vent holes 51 are used to avoid the emission direction of the laser displacement sensor 3.

[0033] Embodiment 2 of the present utility model:

[0034] This embodiment is a further improvement on the basis of the first embodiment. The same parts as the first embodiment are not repeated here, and only the improved points are described:

[0035] like Figure 5 In order to prevent dust and water vapor from entering the protective sleeve 2 and causing pollution to the laser displacement sensor 3, thereby affecting the measurement accuracy of the laser displacement sensor 3, an elastic membrane 7 can be arranged in the first cavity 6. The elastic membrane 7 is arranged along the circumference of the protective sleeve 2, and the two ends of the elastic membrane 7 are sealed and fixedly connected to the inner wall of the sleeve 4. The elastic membrane 7 and the outer wall of the protective sleeve 2 are sealed to form a second cavity 8, and the second cavity 8 is connected to the protective sleeve 2 through the second through hole 21. When the detection rod 1 moves relative to the protective sleeve 2, the elastic membrane 7 can be deformed. Specifically, when the detection rod 1 moves in a direction away from the reflector, the gas in the second cavity 8 is gradually sucked into the protective sleeve 2, and the elastic membrane 7 is concave in a direction close to the protective sleeve 2. When the detection rod 1 moves in a direction close to the reflector, the gas in the protective sleeve 2 is gradually discharged into the second cavity 8, and the elastic membrane 7 is convex in a direction away from the protective sleeve 2.

[0036] In order to improve the sealing between the protective sleeve 2 and the detection rod 1, a receiving groove 22 is provided on the inner side wall of the open end of the protective sleeve 2. The receiving groove 22 is arranged along the circumferential direction of the protective sleeve 2, and a sealing ring 9 is installed in the receiving groove 22. The detection rod 1 is exposed to the air and dust is easily accumulated on the surface. In order to prevent dust from entering the protective sleeve 2 when the detection rod 1 and the protective sleeve 2 slide relative to each other, the following measures can be adopted:

[0037] A cleaning ring 10 is fixedly mounted on the open end of the protective sleeve 2, the center line of the cleaning ring 10 coincides with the center line of the protective sleeve 2, bristles 11 are arranged on the inner wall of the cleaning ring 10, and the end of the bristles 11 away from the cleaning ring 10 abuts against the detection rod 1. When the detection rod 1 and the protective sleeve 2 slide relative to each other, the cleaning ring 10 can remove the dust falling on the detection rod 1.

[0038] like Figure 3 As shown, a limit ring 12 is also provided on the outer periphery of the detection rod 1. The limit ring 12 is arranged at an end away from the laser displacement sensor 3. By setting the limit ring 12, the protective sleeve 2 can be limited to avoid friction between the laser displacement sensor 3 and the reflecting part 5 when not in use.

[0039] Embodiment 3 of the present utility model:

[0040] This embodiment is a further improvement on the basis of the second embodiment, and the same parts as the second embodiment are not repeated here, and only the improved points are described.

[0041] like Figure 6-Figure 7 As shown, in order to facilitate the connection between the detection rod 1 and the protective sleeve 2 and the two sides of the bridge expansion joint, the detection device also includes a first mounting seat 13 and a second mounting seat 14; the end of the detection rod 1 away from the laser displacement sensor 3 is hinged to the first mounting seat 13; the sealing end of the protective sleeve 2 is hinged to the second mounting seat 14; the hinge center line of the detection rod 1 and the first mounting seat 13, and the hinge center line of the protective sleeve 2 and the second mounting seat 14 are parallel, and are both perpendicular to the axis of the detection rod 1.

[0042] As an implementation method, the first mounting seat 13 includes a first mounting plate 15, a second mounting plate 16, a third mounting plate 17 and a fourth mounting plate 18; the first mounting plate 15 is vertically fixedly mounted on the second mounting plate 16 by welding, the connection between the first mounting plate 15 and the second mounting plate 16 is located on the central axis of the second mounting plate 16, the third mounting plate 17 and the fourth mounting plate 18 are both fixedly mounted on the first mounting plate 15 by welding, and the third mounting plate 17 is arranged parallel to the fourth mounting plate 18, the third mounting plate 17 and the fourth mounting plate 18 are both provided with a first mounting hole 19, and the two first mounting holes 19 are arranged oppositely, and the end of the detection rod 1 away from the laser displacement sensor 3 is provided with a first connecting ear 23, and the first connecting ear 23 is rotatably connected to the third mounting plate 17 and the fourth mounting plate 18 through a connecting shaft 24. The second mounting plate 16 is provided with a plurality of second mounting holes 161, and the plurality of second mounting holes 161 are evenly arranged along the circumferential direction of the second mounting plate 16.

[0043] The second mounting seat 14 has the same structure as the first mounting seat 13. A second connecting ear 25 is provided at one end of the protective sleeve 2 away from the cleaning ring 10. The second connecting ear 25 is rotatably connected to the third mounting plate 17 and the fourth mounting plate 18 on the second mounting seat 14 through the connecting shaft 24.

[0044] When in use, a third mounting hole corresponding to the second mounting hole 161 is opened at the bottom of both sides of the bridge expansion joint to be tested, and the second mounting plates 16 of the first mounting seat 13 and the second mounting seat 14 are fixedly installed on both sides of the bridge expansion joint by bolts passing through the corresponding second mounting holes 161 and the third mounting holes.

[0045] The utility model also provides a bridge expansion joint displacement detection system, comprising a plurality of detection devices as described above, a wireless transmission module and a remote server; the detection device is electrically connected to the wireless transmission module; the wireless transmission module is fixedly mounted on the detection device, and the wireless transmission module is communicatively connected to the remote server. The detection value of the detection device can be transmitted to the remote server in real time through the wireless transmission module, and the remote server can grasp the actual expansion and contraction of the bridge expansion joint in real time according to the detection value, so as to judge whether the bridge needs to be maintained.

[0046] The above describes in detail the structure, features and effects of the utility model based on the embodiments shown in the drawings. The above is only a preferred embodiment of the utility model, but the utility model is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the utility model, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and the drawings, should be within the protection scope of the utility model.

Claims

1. A device for detecting displacement of a bridge expansion joint, characterized in that: It comprises a detection rod (1) and a protective sleeve (2) having an opening at one end; One end of the detection rod (1) is inserted into the protective sleeve (2) in a sliding and sealing manner, a laser displacement sensor (3) is fixedly mounted on one end of the detection rod (1) located in the protective sleeve (2), and a reflecting portion (5) facing the laser displacement sensor (3) is provided in the protective sleeve (2); A sleeve (4) is sealed and fixedly sleeved on one end of the protective sleeve (2) away from the detection rod (1); a first cavity (6) is formed between the sleeve (4) and the protective sleeve (2); a first through hole (41) communicating with the first cavity (6) is formed on the sleeve (4); and a second through hole (21) communicating with the first cavity (6) is formed on the protective sleeve (2).

2. The device for detecting displacement of a bridge expansion joint according to claim 1, characterized in that: The reflecting portion (5) is a reflecting plate having the same inner diameter as the protective sleeve (2); the reflecting plate is fixedly mounted on the inner wall of the protective sleeve (2), and the center line of the reflecting plate coincides with the center line of the protective sleeve (2); the reflecting plate is located between the second through hole (21) and the laser displacement sensor (3); and a vent hole (51) is provided on the reflecting plate.

3. The device for detecting displacement of a bridge expansion joint according to claim 1 is characterized in that: An elastic membrane (7) is provided in the first cavity (6), and the elastic membrane (7) is arranged along the circumference of the protective sleeve (2). The elastic membrane (7) and the outer wall of the protective sleeve (2) are sealed to form a second cavity (8), and the second cavity (8) is connected to the protective sleeve (2) through the second through hole (21).

4. The device for detecting displacement of a bridge expansion joint according to claim 1, characterized in that: An accommodating groove (22) is provided on the inner side wall of the open end of the protective sleeve (2). The accommodating groove (22) is arranged along the circumferential direction of the protective sleeve (2), and a sealing ring (9) is installed in the accommodating groove (22).

5. The device for detecting displacement of a bridge expansion joint according to claim 1, characterized in that: A cleaning ring (10) is fixedly mounted on the open end of the protective sleeve (2), bristles (11) are provided on the inner wall of the cleaning ring (10), and one end of the bristles (11) away from the cleaning ring (10) abuts against the detection rod (1).

6. The device for detecting displacement of a bridge expansion joint according to claim 1, characterized in that: A limiting ring (12) is also provided on the outer circumference of the detection rod (1), and the limiting ring (12) is arranged at an end away from the laser displacement sensor (3).

7. The device for detecting displacement of a bridge expansion joint according to claim 1, characterized in that: It also comprises a first mounting seat (13) and a second mounting seat (14); one end of the detection rod (1) away from the laser displacement sensor (3) is hinged to the first mounting seat (13); the sealing end of the protective sleeve (2) is hinged to the second mounting seat (14); the hinge center line of the detection rod (1) and the first mounting seat (13) and the hinge center line of the protective sleeve (2) and the second mounting seat (14) are parallel and perpendicular to the axis of the detection rod (1).

8. A bridge expansion joint displacement detection system, characterized in that: It comprises a plurality of detection devices, wireless transmission modules and remote servers as described in any one of claims 1 to 7 above; the detection device is electrically connected to the wireless transmission module; the wireless transmission module is fixedly mounted on the detection device, and the wireless transmission module is communicatively connected to the remote server.

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