Suspension bridge catwalk global state online monitoring system

Abstract

The utility model discloses a suspension bridge catwalk global state on-line monitoring system which comprises a catwalk system which comprises a plurality of portal frame bearing cables and a plurality of catwalk bearing cables which are erected in the length direction of a suspension bridge; the portal frame bearing cable is arranged above the catwalk bearing cable and is used for supporting a catwalk portal frame; the catwalk bearing cable is used for supporting the catwalk surface layer; the two ends of the portal bearing cable and the two ends of the catwalk bearing cable are anchored to the two ends of the suspension bridge through anchoring structures correspondingly. At least one portal bearing cable and at least one catwalk bearing cable are built-in optical fiber bearing cables; the built-in optical fiber load-bearing cable comprises a plurality of load-bearing cable steel wire ropes, an optical fiber is arranged in one load-bearing cable steel wire rope, and the optical fiber is led out of the end of the load-bearing cable steel wire rope, penetrates through the anchoring structure and then is sequentially connected with a signal acquisition instrument and a data processor. On the premise that the stress and the appearance of a catwalk system are not affected, online monitoring of the global state of the catwalk can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of catwalk monitoring technology. More specifically, this utility model relates to an online monitoring system for the entire status of a suspension bridge catwalk. Background Technology

[0002] The catwalk is the most important temporary structure in the construction of the superstructure of a suspension bridge. Currently, domestic suspension bridge catwalk systems generally adopt continuous catwalks, meaning that the load-bearing cable of the catwalk runs from one anchorage to the other as a single, continuous cable. Continuous catwalks are convenient to erect, allow for quick alignment adjustments, and have high utilization rates of steel wire ropes. However, if the load-bearing cable breaks, it could cause the entire catwalk to collapse, leading to a major safety accident. Therefore, monitoring the status of the catwalk system is particularly important.

[0003] Currently, to monitor the status of the catwalk system, pressure rings are typically installed at the anchorages of the catwalk's load-bearing cables. The safety of the catwalk is determined by whether the cable tension is within the design threshold. This method is quick but provides only one indicator, making it more suitable for short-span suspension bridges. However, this method is clearly insufficient for monitoring catwalks on long-span bridges. Firstly, the load-bearing cables of long-span suspension bridges are subject to various constraints along their length, resulting in inconsistent cable tensions, especially at the anchorages where the tension is not at its maximum value. Secondly, the catwalk system of long-span suspension bridges is more complex; in addition to the catwalk's load-bearing cables, other cables such as gantry cables and handrail cables also share the load, leading to discrepancies between the cable distribution and the design specifications. Therefore, monitoring the entire catwalk system of long-span suspension bridges to ensure the safety of personnel working on it is essential. Utility Model Content

[0004] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0005] To achieve these objectives and other advantages according to this utility model, a suspension bridge catwalk online monitoring system is provided, comprising: a catwalk system including multiple gantry load-bearing cables and multiple catwalk load-bearing cables erected along the length of the suspension bridge; the gantry load-bearing cables are positioned above the catwalk load-bearing cables to support the catwalk gantry; the catwalk load-bearing cables support the catwalk surface layer; the ends of the gantry load-bearing cables and the catwalk load-bearing cables are respectively anchored to the ends of the suspension bridge via anchoring structures; at least one of the gantry load-bearing cables and at least one catwalk load-bearing cable is a built-in optical fiber load-bearing cable; the built-in optical fiber load-bearing cable includes multiple load-bearing cable wire ropes, one of which has an embedded optical fiber, the optical fiber being led out from the end of the load-bearing cable wire rope, passing through the anchoring structure, and then sequentially connected to a signal acquisition instrument and a data processor.

[0006] Preferably, the load-bearing cable includes a central strand and multiple strands of steel wire evenly distributed around the outer periphery of the central strand; a through-hole is provided in the central wire of one of the central strands of the load-bearing cable, and the optical fiber 11 is fixedly disposed in the through-hole.

[0007] Preferably, the center wire is a steel wire or a carbon rod.

[0008] Preferably, the optical fiber is fixed inside the channel by a curing adhesive.

[0009] Preferably, an optical fiber signal interface is provided after the optical fiber extends from the load-bearing cable steel wire rope.

[0010] This utility model has at least the following beneficial effects:

[0011] 1. The online monitoring system for the entire status of the catwalk of the suspension bridge provided by this utility model can realize online monitoring of the entire status of the catwalk, such as cable force, temperature, vibration, etc., without affecting the stress and shape of the catwalk system, by replacing some of the gantry load-bearing cables and catwalk load-bearing cables in the catwalk system with built-in fiber optic load-bearing cables.

[0012] 2. The online monitoring system for the entire catwalk status of the suspension bridge provided by this utility model connects optical fibers to signal acquisition instruments and data processors at the anchorages of the gantry load-bearing cables and the catwalk load-bearing cables. This can maximize the protection of optical fibers and give full play to the advantages of optical fiber sensing, so as to realize all-weather early warning of the entire catwalk status and avoid safety accidents.

[0013] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the online monitoring system for the entire status of the catwalk of the suspension bridge described in this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the central strand described in this utility model;

[0016] Figure 3 This is a schematic cross-sectional view of the catwalk system described in this utility model; Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0018] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] like Figures 1 to 3 As shown, this utility model provides an online monitoring system for the entire status of a suspension bridge catwalk, comprising: a catwalk system, which includes multiple gantry load-bearing cables 2 and multiple catwalk load-bearing cables 1 erected along the length of the suspension bridge; the gantry load-bearing cables 2 are positioned above the catwalk load-bearing cables 1 to support the catwalk gantry 9; the catwalk load-bearing cables 1 are used to support the catwalk surface layer; the two ends of the gantry load-bearing cables 2 and the catwalk load-bearing cables 1 are respectively anchored to the two ends of the suspension bridge through anchoring structures; at least one of the gantry load-bearing cables 2 and at least one catwalk load-bearing cable 1 are built-in optical fiber load-bearing cables; the built-in optical fiber load-bearing cable includes multiple load-bearing cable steel wire ropes, one of which has an optical fiber 11 built-in, the optical fiber 11 is led out from the end of the load-bearing cable steel wire rope, passes through the anchoring structure, and is sequentially connected to a signal acquisition instrument 7 and a data processor 8.

[0020] In this technical solution, based on the cross-sectional layout of the catwalk system, some of the gantry load-bearing cables 2 and the catwalk load-bearing cables 1 are replaced with the built-in optical fiber load-bearing cables. The optical fibers 11 are embedded synchronously during the manufacturing of the gantry load-bearing cables 2 and the catwalk load-bearing cables 1. Then, the catwalk system is erected according to the conventional catwalk system erection process. Finally, the anchoring structures 3 and 4 of the gantry load-bearing cables 2 and 1 are connected to the signal acquisition instrument 7 and the data processor 8 respectively via lead wires, thus forming the online monitoring system for the entire catwalk status of the suspension bridge. Both the gantry load-bearing cable anchoring structure 3 and the catwalk load-bearing cable anchoring structure 4 can adopt conventional anchor structures. The signal acquisition instrument 7 collects the optical fiber signals of each optical fiber 11 in real time. The data processor 8, based on the corresponding relationship between the optical wave temperature, strain, or vibration within the optical fiber (see equation (1), can obtain the temperature, cable force, and vibration frequency at any point in the entire catwalk.

[0021] (1)

[0022] In equation (1), T iLet T be the temperature T at the i-th point along the embedded fiber optic load-bearing cable in the catwalk system, and k be the temperature at the i-th point along the cable. T x is the temperature conversion factor. i Let F be the optical signal at position i (e.g., wavelength, frequency, etc.); i Let F be the cable force F at the j-th point along the embedded fiber optic load-bearing cable in the catwalk system. F x is the cable force conversion factor. j W is the optical signal at position j; n Let W be the vibration frequency W at the nth point along the embedded fiber optic load-bearing cable in the catwalk system. W x is the frequency conversion factor. n Let be the optical signal at position n.

[0023] Then, based on the set thresholds, such as the upper and lower temperature limits T... max With T min upper and lower limits of cable force F max and F min Vibration frequency upper and lower limits W max and W min The system can also obtain real-time online data on temperature, cable tension, and vibration frequency at any point along the catwalk, enabling early warning and preventing accidents.

[0024] In another technical solution, the load-bearing cable includes a central strand 10 and multiple strands of steel wire evenly distributed around the outer periphery of the central strand; one of the central strands 10 of the load-bearing cable includes a continuous channel within its central wire, and the optical fiber 11 is fixedly disposed within the channel. After replacing the original central steel wire of the central strand with a central wire containing the embedded optical fiber 11, it is twisted with ordinary steel wire 12 to form the central strand 10, and then combined with other ordinary steel wires to form a load-bearing cable with an embedded steel wire, and finally combined with other ordinary load-bearing cable ropes to form the load-bearing cable with an embedded optical fiber.

[0025] In another technical solution, the center wire is a steel wire or a carbon rod. The diameter of the steel wire or carbon rod is the same as the diameter of the original center wire of the center strand 10.

[0026] Furthermore, the optical fiber 11 is fixed within the channel using a curing adhesive. The curing adhesive is uniformly applied along the longitudinal direction of the optical fiber 11 to fix it within the channel. Alternatively, symmetrical grooves can be etched on the outer periphery of a steel wire or carbon rod, and the optical fiber can be fixed within the grooves using curing adhesive. Then, a cladding layer is wrapped around the outer periphery to form the central wire. The cladding layer can be a steel tape. When the central wire has multiple grooves, temperature and humidity optical fibers, strain optical fibers, or vibration optical fibers can be inserted respectively.

[0027] In another technical solution, the optical fiber 11 is provided with an optical fiber signal interface after it extends from the load-bearing cable steel wire rope. The optical fiber signal interface is used to connect with the lead wire, thereby transmitting the optical fiber signal to the signal acquisition device 6. The gantry load-bearing cable 2 and the catwalk load-bearing cable 1 are respectively connected to the signal acquisition device 6 through the first lead wire 5 and the second lead wire 6.

[0028] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A system for online monitoring of the entire status of a catwalk on a suspension bridge, characterized in that, include: The catwalk system includes multiple portal frame load-bearing cables and multiple catwalk load-bearing cables that are erected along the length of the suspension bridge; The gantry support cable is positioned above the catwalk support cable to support the catwalk gantry; the catwalk support cable is used to support the catwalk surface layer. The two ends of the gantry load-bearing cable and the catwalk load-bearing cable are respectively anchored to the two ends of the suspension bridge through anchoring structures; At least one of the gantry load-bearing cables and at least one catwalk load-bearing cable is a built-in optical fiber load-bearing cable; the built-in optical fiber load-bearing cable includes multiple load-bearing cable wire ropes, one of which has an optical fiber built-in. The optical fiber is led out from the end of the load-bearing cable wire rope, passes through the anchoring structure, and is connected to the signal acquisition instrument and the data processor in sequence.

2. The online monitoring system for the entire status of the catwalk of a suspension bridge as described in claim 1, characterized in that, The load-bearing cable includes a central strand and multiple strands of steel wire evenly distributed around the outer periphery of the central strand; a through-hole is provided in the central wire of one of the central strands of the load-bearing cable, and the optical fiber 11 is fixedly disposed in the through-hole.

3. The online monitoring system for the entire status of the catwalk of a suspension bridge as described in claim 2, characterized in that, The central wire is a steel wire or a carbon rod.

4. The online monitoring system for the entire status of the catwalk of a suspension bridge as described in claim 2, characterized in that, The optical fiber is fixed inside the channel by a curing adhesive.

5. The online monitoring system for the entire status of the catwalk of a suspension bridge as described in claim 1, characterized in that, The optical fiber is provided with an optical fiber signal interface after it leads out of the load-bearing cable steel wire rope.

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