Longitudinal displacement measuring device for cable-stayed bridge

Abstract

The utility model relates to the technical field of bridge displacement measurement, in particular to a longitudinal displacement measuring device for a cable-stayed bridge, which comprises a displacement measuring mechanism and two mounting brackets, each mounting bracket comprises a first connecting part and a second connecting part, the first connecting part of one mounting bracket is connected with the main beam, the first connecting part of the other mounting bracket is connected with the cable bent tower, and the second connecting parts of the two mounting brackets are arranged in parallel; the two ends of the displacement measuring mechanism are connected with the second connecting parts of the two installation supports respectively, and the displacement measuring mechanism is used for measuring the relative displacement between the two second connecting parts. The main beam longitudinal displacement monitoring device is simple in structure, can continuously monitor the longitudinal displacement of the main beam after being installed, and avoids measurement errors caused by repeated arrangement of instruments in a total station method.

Description

Technical Field

[0001] This utility model relates to the field of bridge displacement measurement technology, specifically to a longitudinal displacement measurement device for cable-stayed bridges. Background Technology

[0002] A floating cable-stayed bridge consists of a main girder, towers, and cables. The main girder is connected to the towers via cables. The main girder of a floating cable-stayed bridge does not have supports at the towers. Since the main girder can freely expand and contract in the longitudinal direction, it is in a floating state. When cable replacement is required, it is necessary to accurately measure the longitudinal displacement of the main girder at the towers to eliminate potential safety hazards.

[0003] Existing measurement methods mainly involve measuring the coordinates of the pylon and the main beam separately using a total station, and then calculating the longitudinal relative displacement between the pylon and the main beam. This method requires setting up multiple measuring devices, and the measurement error is relatively large, requiring a lot of manpower and resources to complete the measurement.

[0004] In summary, there is an urgent need for a longitudinal displacement measuring device for cable-stayed bridges to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this utility model is to provide a longitudinal displacement measuring device for cable-stayed bridges, and the specific technical solution is as follows:

[0006] A longitudinal displacement measuring device for a cable-stayed bridge includes a displacement measuring mechanism and two mounting brackets;

[0007] The mounting bracket includes a first connecting part and a second connecting part. The first connecting part of one mounting bracket is connected to the main beam, and the first connecting part of the other mounting bracket is connected to the cable tower. The second connecting parts of the two mounting brackets are arranged parallel to each other.

[0008] The displacement measuring mechanism is connected to the second connecting parts of two mounting brackets at both ends, and is used to measure the relative displacement between the two second connecting parts.

[0009] Preferably, the displacement measuring mechanism includes a piston, a liquid storage container, and a graduated transparent tube;

[0010] The piston is movably disposed inside the liquid storage container, and the piston and the inner wall of the liquid storage container form a portion for containing liquid.

[0011] The liquid storage container is connected to a graduated transparent tube via a flexible tube, and the liquid level is set within the graduated transparent tube.

[0012] The piston is connected to the second connecting part of one of the mounting brackets via a connector, and the liquid storage container is connected to the second connecting part of the other mounting bracket via a connector.

[0013] Preferably, a level tube is provided on the outer wall of the liquid storage container.

[0014] Preferably, the connector includes a base and a connecting rod. The base is disposed on the second connecting part of the mounting bracket, and one end of the connecting rod is connected to the base, while the other end is connected to a piston or a liquid storage container.

[0015] Preferably, the base is a circular chassis, and the end of the connecting rod is located at the center of the base.

[0016] Preferably, the liquid storage container is a liquid storage cylinder, the piston is matched with the liquid storage cylinder, and the end of the connecting rod is located at the center of the piston.

[0017] Preferably, the liquid is hydraulic oil.

[0018] The application of the technical solution of this utility model has the following beneficial effects:

[0019] This utility model discloses a longitudinal displacement measuring device for cable-stayed bridges. By installing a displacement measuring device between the main girder and the tower, the longitudinal displacement of the main girder is converted into a relative displacement between the two mounting supports via mounting brackets. The relative displacement between the mounting supports is then accurately measured by a displacement measuring mechanism, thereby obtaining the longitudinal displacement of the main girder. Compared with existing technologies, this utility model has a simple structure and, after installation, enables continuous monitoring of the longitudinal displacement of the main girder, avoiding measurement errors caused by repeatedly setting up instruments in the total station method.

[0020] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic diagram of the installation of the longitudinal displacement measuring device for a cable-stayed bridge in a preferred embodiment of this utility model;

[0024] Figure 2 yes Figure 1 A schematic diagram of the connection of the displacement measuring mechanism.

[0025] Explanation of key component symbols:

[0026] 100-Displacement measuring mechanism, 110-Piston, 120-Liquid storage container, 130-Graded transparent tube, 140-Liquid, 150-Hose, 160-Connector, 161-Base, 162-Connecting rod, 170-Level tube, 200-Mounting bracket, 210-First connecting part, 220-Second connecting part, A-Main beam, B-Tower. Detailed Implementation

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0028] Example:

[0029] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the installation of the longitudinal displacement measuring device for a cable-stayed bridge in a preferred embodiment of this utility model; Figure 2 yes Figure 1 A schematic diagram of the connection of the displacement measuring mechanism.

[0030] like Figure 1 and Figure 2 As shown, this embodiment discloses a longitudinal displacement measuring device for a cable-stayed bridge, including a displacement measuring mechanism 100 and two mounting brackets 200;

[0031] The mounting bracket 200 includes a first connecting part 210 and a second connecting part 220. The first connecting part 210 of one mounting bracket 200 is connected to the main beam A, and the first connecting part 210 of the other mounting bracket 200 is connected to the tower B. The second connecting parts 220 of the two mounting brackets 200 are arranged parallel to each other.

[0032] The displacement measuring mechanism 100 is connected at both ends to the second connecting parts 220 of the two mounting brackets 200 respectively, and is used to measure the relative displacement between the two second connecting parts 220.

[0033] It should be noted that the mounting bracket 200 in this embodiment is an L-shaped angle iron, and the first connecting part 210 and the second connecting part 220 are respectively one side of the L-shaped angle iron. Furthermore, in this embodiment, the first connecting part 210 is fixedly connected to the main beam A or the cable tower B using structural adhesive.

[0034] In this embodiment, the displacement measuring mechanism 100 includes a piston 110, a liquid storage container 120, and a graduated transparent tube 130. The piston 110 is movably disposed within the liquid storage container 120, and the piston 110 and the inner wall of the liquid storage container 120 form a portion for containing liquid 140. The portion of the liquid storage container 120 for containing liquid 140 is connected to the graduated transparent tube 130 via a flexible tube 150, and the liquid level of the liquid 140 is set within the graduated transparent tube 130. The piston 110 is connected to the second connecting portion 220 of one of the mounting brackets 200 via a connector 160, and the liquid storage container 120 is connected to the second connecting portion 220 of the other mounting bracket 200 via the connector 160.

[0035] It should be noted that the liquid storage space in the liquid storage container 120 changes with the movement of the piston 110. The relative displacement between the main beam A and the tower B will cause relative displacement between the second connecting parts 220 of the two mounting brackets 200, thereby causing the piston 110 to move along the length of the liquid storage container 120. The change in the volume of the liquid 140 in the liquid storage container 120 will cause the liquid level in the graduated transparent tube 130 to change. The staff can accurately detect the displacement of the main beam A of the cable-stayed bridge in the longitudinal direction by recording the reading on the graduated transparent tube 130.

[0036] Furthermore, in order to ensure the accuracy of the conversion between the displacement of the main beam A and the liquid level height, a level tube 170 is provided on the outer wall of the liquid storage container 120, so that the length direction of the liquid storage container 120 is the same as the longitudinal displacement direction of the main beam.

[0037] In this embodiment, the connector 160 includes a base 161 and a connecting rod 162. The base 161 is disposed on the second connecting part 220 of the mounting bracket 200. One end of the connecting rod 162 is connected to the base 161, and the other end is connected to the piston 110 or the liquid storage container 120.

[0038] In some specific implementation cases, the base 161 is a circular chassis, and the end of the connecting rod 162 is located at the center of the base 161.

[0039] In some other specific implementations, the liquid storage container 120 is a liquid storage cylinder, the piston 110 is matched with the liquid storage cylinder, and the end of the connecting rod 162 is located at the center of the piston 110.

[0040] In this embodiment, the liquid 140 is hydraulic oil. In addition, the liquid 140 in this embodiment can also be other non-volatile oils.

[0041] The measurement method used in this embodiment is as follows:

[0042] 1) When a longitudinal bridge displacement L occurs between the main beam A and the tower B, the volume change of the liquid 140 in the liquid storage container 120 (a cylinder is used in this embodiment) is: (D is the inner diameter of the cylinder).

[0043] 2) The volume change of liquid 140 inside the cylinder is the same as that inside the graduated transparent tube 130 and the flexible tube 150. At this time, the volume of liquid 140 inside the graduated transparent tube 130 is: (d is the inner diameter of the graduated transparent tube, and h is the liquid level change).

[0044] 3) According to V'=V, we know that...

[0045] 4) If D = 10cm and d = 1cm, when a longitudinal bridge displacement of 8mm occurs between the main beam A and the tower B, the change in liquid level is:

[0046] It should be noted that before applying the device of this embodiment, correlation can be used to perform linear regression to establish a curve. Based on the liquid level change h, the longitudinal bridge displacement L between the main beam and the tower can be accurately determined.

[0047] By using the device of this embodiment, real-time monitoring of the longitudinal displacement of the main beam A can be achieved. At the same time, the device of this embodiment can directly measure the longitudinal displacement of the main beam and amplify the displacement for easier observation and to reduce errors.

[0048] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A longitudinal displacement measuring device for a cable-stayed bridge, characterized in that, It includes a displacement measuring mechanism (100) and two mounting brackets (200); The mounting bracket (200) includes a first connecting part (210) and a second connecting part (220). The first connecting part (210) of one mounting bracket (200) is connected to the main beam (A), and the first connecting part (210) of the other mounting bracket (200) is connected to the cable tower (B). The second connecting parts (220) of the two mounting brackets (200) are arranged parallel to each other. The displacement measuring mechanism (100) is connected at both ends to the second connecting parts (220) of two mounting brackets (200) respectively, and is used to measure the relative displacement between the two second connecting parts (220).

2. The longitudinal displacement measuring device for cable-stayed bridges according to claim 1, characterized in that, The displacement measuring mechanism (100) includes a piston (110), a liquid storage container (120), and a graduated transparent tube (130); The piston (110) is movably disposed within the liquid storage container (120), and the piston (110) and the inner wall of the liquid storage container (120) form a portion for containing liquid (140); The portion of the liquid storage container (120) used to hold the liquid (140) is connected to the graduated transparent tube (130) via a hose (150), and the liquid level of the liquid (140) is set in the graduated transparent tube (130); The piston (110) is connected to the second connection part (220) of one of the mounting brackets (200) via a connector (160), and the liquid storage container (120) is connected to the second connection part (220) of the other mounting bracket (200) via a connector (160).

3. The longitudinal displacement measuring device for cable-stayed bridges according to claim 2, characterized in that, A level tube (170) is provided on the outer wall of the liquid storage container (120).

4. The longitudinal displacement measuring device for cable-stayed bridges according to claim 2, characterized in that, The connector (160) includes a base (161) and a connecting rod (162). The base (161) is disposed on the second connecting part (220) of the mounting bracket (200). One end of the connecting rod (162) is connected to the base (161), and the other end is connected to the piston (110) or the liquid storage container (120).

5. The longitudinal displacement measuring device for cable-stayed bridges according to claim 4, characterized in that, The base (161) is a circular chassis, and the end of the connecting rod (162) is located at the center of the base (161).

6. The longitudinal displacement measuring device for cable-stayed bridges according to claim 4, characterized in that, The liquid storage container (120) is a liquid storage cylinder, the piston (110) is matched with the liquid storage cylinder, and the end of the connecting rod (162) is located at the center of the piston (110).

7. The longitudinal displacement measuring device for cable-stayed bridges according to claim 2, characterized in that, The liquid (140) is hydraulic oil.

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