Cable force monitoring device for bridge suspender replacement

Abstract

The utility model discloses a cable force monitoring device for bridge suspender replacement, which comprises a steel strand sheath and a plurality of vibrating wire sensors, a plurality of accommodating groove chambers are uniformly arranged in the steel strand sheath, the vibrating wire sensors are respectively arranged in the corresponding accommodating groove chambers, inner side open grooves are uniformly arranged on the inner side circumferential surface of the steel strand sheath, and the inner side open grooves are communicated with the accommodating groove chambers. The inner side open groove is communicated with the containing groove chamber, and a protective ring pad is arranged on the outer side of the steel stranded wire sheath and covers the area of the containing groove chamber. By adopting the sliding connection structure of the protection ring pad and the U-shaped chute, the rapid adjustment of rotation-downward movement-reverse rotation of the protection ring pad is realized, so that the maintenance or replacement of the vibrating wire sensor does not need to disassemble the steel strand sheath, the outer side open slot can be exposed only by sliding the protection ring pad, and the maintenance and replacement are convenient. And the high-altitude operation difficulty and risk are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of bridges, and more specifically, to a cable force monitoring device for bridge suspender replacement. Background Technology

[0002] Monitoring cable tension after bridge suspender replacement is a crucial step in ensuring the structural safety, performance stability, and compliance with design requirements of the bridge. After replacement, the actual cable tension may deviate from the design value. Monitoring confirms whether the cable tension of the new suspenders meets design requirements, preventing structural safety hazards caused by insufficient tension or overloading. Uneven cable tension can lead to uneven stress on the suspenders, potentially causing fatigue damage over long-term operation. Real-time monitoring can promptly detect abnormal cable tension, preventing premature failure of localized suspenders.

[0003] Currently, the monitoring methods used in this field typically involve attaching a sensing device to the surface of the boom and inferring cable force by monitoring strain changes. For example, Chinese patent application No. 202221727289.3 discloses a mounting base for a MEMS sensor in bridge natural frequency monitoring. The MEMS sensor is attached to the upper horizontal plate of the U-shaped mounting plate, and a waterproof box is added to the outside of the MEMS sensor. The FBG sensor is tightly bonded to the surface of the boom with adhesive, forming an adhesive layer with the boom surface. However, the disadvantage of this technology is that when the boom is subjected to stress and deformation, the strain is transmitted to the sensor through the adhesive layer. If the thickness of the adhesive layer is uneven, stress concentration will occur in the area of ​​abrupt thickness change. This local stress concentration will not only significantly accelerate the aging process of the adhesive, but also cause damage such as debonding of the adhesive interface and propagation of microcracks, ultimately leading to the sensor peeling off from the surface of the boom and failure. Utility Model Content

[0004] The purpose of this invention is to provide a cable force monitoring device for bridge suspender replacement, in order to solve the problem that when the suspender is subjected to stress and deformation, the strain is transmitted to the sensor through the adhesive layer. If the adhesive layer thickness is uneven, stress concentration will occur in the area of ​​abrupt thickness change.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] This utility model discloses a cable tension monitoring device for bridge suspender replacement, comprising a steel strand sheath and several vibrating wire sensors. The steel strand sheath has several uniformly distributed receiving slots inside, and each vibrating wire sensor is respectively installed in a corresponding receiving slot. The inner circumferential surface of the steel strand sheath has uniformly distributed inner slots, which are connected to the receiving slots. A protective ring pad is provided on the outer side of the steel strand sheath, covering the area of ​​the receiving slot.

[0007] Preferably, the outer side of the steel strand sheath is provided with an outer groove, which is connected to the receiving groove and the inner groove.

[0008] Preferably, a U-shaped groove is formed between two adjacent outer slots, and a limiting movable member is uniformly provided on the inner surface of the protective ring pad, with each limiting movable member slidingly connected to the corresponding U-shaped groove.

[0009] Preferably, the height of the protective ring pad is greater than the outer groove.

[0010] Preferably, the surface of the vibrating wire sensor is provided with a force-sensitive element, which matches the inner slot and contacts the corresponding steel strand.

[0011] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0012] 1. A cable force monitoring device for bridge hanger replacement, which, by designing a receiving groove and an inner slot within the steel strand sheath, allows the force-sensitive element of the vibrating wire sensor to directly contact the steel strand, achieving precise alignment of monitoring points. Combined with the priority layout of high, medium, and low-level monitoring points (anchoring end, middle, and transition section), this device is installed at these three locations. Thus, the cable force changes at these three locations on the bridge are monitored sequentially by the vibrating wire sensor, which can comprehensively cover the key stress areas of the hanger and ensure the continuity and reliability of cable force monitoring data.

[0013] 2. By employing a sliding connection structure between the protective ring pad and the U-shaped groove, rapid adjustment of the protective ring pad—rotation, downward movement, and reverse rotation—is achieved. This eliminates the need to disassemble the steel wire sheath for maintenance or replacement of the vibrating wire sensor; simply sliding the protective ring pad exposes the outer groove, significantly reducing the difficulty and risk of high-altitude operations. Furthermore, after the protective ring pad returns to its original position, it continues to cover the area of ​​the receiving chamber, ensuring the sensor's protective integrity in non-maintenance conditions and extending the equipment's lifespan. Attached Figure Description

[0014] Figure 1 This is an overall structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the steel strand sheath of this utility model;

[0016] Figure 3 This is a schematic diagram of the outer groove and protective ring gasket of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the protective ring gasket of this utility model.

[0018] In the diagram: 1. Steel strand sheath; 11. Outer groove; 12. U-shaped chute; 2. Protective ring gasket; 21. Limiting moving part; 3. Receiving chamber; 4. Vibrating wire sensor; 41. Force sensitive element; 5. Inner groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0021] Combination Figure 1 This utility model discloses a cable tension monitoring device for bridge hanger replacement, comprising a steel strand sheath 1 and several vibrating wire sensors 4. The steel strands are threaded through the steel strand sheath 1. The top end of the hanger is embedded and connected to the main beam concrete of the bridge, and the bottom end of the hanger is embedded and connected to the bridge deck concrete. Several receiving slots 3 are evenly distributed inside the steel strand sheath 1, and each vibrating wire sensor 4 is respectively installed in the corresponding receiving slot 3. The inner circumferential surface of the steel strand sheath 1 is evenly distributed with inner grooves 5, which are connected to the receiving slots 3. A protective ring pad 2 is provided on the outer side of the steel strand sheath 1, covering the area of ​​the receiving slot 3.

[0022] The present invention will be further described below with reference to the embodiments.

[0023] Combination Figures 2-4 The outer side of the steel strand sheath 1 has an outer groove 11, which is connected to the receiving chamber 3 and the inner groove 5. A U-shaped groove 12 is provided between two adjacent outer grooves 11. The height of the U-shaped groove 12 is smaller than the height of the outer groove 11. A force-sensitive element 41 is provided on the surface of the vibrating wire sensor 4. The force-sensitive element 41 matches the inner groove 5 and is in contact with the steel strand. The height of the protective ring pad 2 is larger than that of the outer groove 11. Several limiting movable parts 21 are evenly provided on the inner surface of the protective ring pad 2. Each limiting movable part 21 is slidably connected to the corresponding U-shaped groove 12. During daily operation, the protective ring pad 2 completely covers the outer groove 11 to avoid being subjected to other impact forces and foreign objects.

[0024] In this embodiment, in order to enhance the monitoring of cable force of the bridge suspender, priorities are set according to different installation positions: high priority monitoring points are located at the anchor end; medium priority monitoring points are located in the middle of the suspender; and low priority monitoring points are located in the transition section. The device is installed at these three positions, and the cable force changes are monitored sequentially at these three positions of the bridge by the vibrating wire sensor 4. The installation position of the vibrating wire sensor 4 is restricted by the outer slot 11. The vibrating wire sensor 4 monitors the cable force of the steel strands at different heights inside the suspender in real time. The inner slot 5 makes the force-sensitive element 41 contact the steel strands inside the steel strand sheath 1 to ensure stable connection of the monitoring points.

[0025] To facilitate regular maintenance of the vibrating wire sensor 4, a limiting movable part 21 is slidably connected to the U-shaped slide 12. The limiting movable part 21 rotates and slides along the first end of the U-shaped slide 12 to the corner position, then moves down, and then rotates and moves to the end of the U-shaped slide 12. This allows for the adjustment of the protective ring pad 2 through rotation, downward movement, and reverse rotation, so that the outer slot 11 is smoothly exposed. This enables maintenance or replacement of the vibrating wire sensor 4. Afterwards, the protective ring pad 2 is returned to its original position to continuously protect the vibrating wire sensor 4. This replaces the traditional adhesive installation method of the sensor, ensuring the connection stability between the sensor and the bridge, and without increasing the installation and maintenance burden.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cable tension monitoring device for bridge suspender replacement, characterized in that: The device includes a steel strand sheath (1) and several vibrating wire sensors (4). The steel strand sheath (1) has several uniformly arranged receiving slots (3) inside. Each vibrating wire sensor (4) is respectively arranged in the corresponding receiving slot (3). The inner circumferential surface of the steel strand sheath (1) has uniformly arranged inner grooves (5). The inner grooves (5) and the receiving slots (3) are connected. The outer side of the steel strand sheath (1) is provided with a protective ring pad (2), which covers the area of ​​the receiving slot (3).

2. The cable tension monitoring device for bridge suspender replacement according to claim 1, characterized in that: The outer side of the steel strand sheath (1) is provided with an outer groove (11), which is connected to the receiving chamber (3) and the inner groove (5).

3. The cable tension monitoring device for bridge suspender replacement according to claim 2, characterized in that: A U-shaped groove (12) is provided between two adjacent outer slots (11), and a number of limiting movable parts (21) are evenly provided on the inner surface of the protective ring pad (2), and each limiting movable part (21) is slidably connected to the corresponding U-shaped groove (12).

4. The cable tension monitoring device for bridge suspender replacement according to claim 2, characterized in that: The height dimension of the protective ring pad (2) is greater than that of the outer groove (11).

5. The cable tension monitoring device for bridge suspender replacement according to any one of claims 1 to 4, characterized in that: The surface of the vibrating wire sensor (4) is provided with a force-sensitive element (41), which is matched with the inner groove (5) and in contact with the corresponding steel strand.

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