Suspension type telescopic arc compensation device for laying high-voltage cable along with bridge, bridge and method

Abstract

The invention discloses a suspension type telescopic arc compensation device for laying a high-voltage cable along with a bridge, the bridge and a method.The compensation device comprises a linear walking mechanism fixed to the top of the bridge, the linear walking mechanism is sequentially hinged to a suspension chain assembly and a cable supporting assembly to achieve multi-direction adjustment, and a limiting assembly is arranged below the cable supporting assembly; the base is inserted into a bridge bottom beam to limit the relative movement range; a plurality of the devices are arranged in the bridge along the length direction at intervals, and the high-voltage cable penetrates and is fixed in a vertical snakelike manner. The installation adopts hoisting butt joint after prefabrication and assembly. The device is provided with a plurality of hinge structures so as to realize multi-directional degree-of-freedom adjustment, deformation and vibration of the cable caused by telescopic movement of a bridge can be well absorbed, the maximum range of sag of each section of the cable along with telescopic change of the bridge can be limited through the device, and it is ensured that the cable maintains good self-performance when the bridge stretches out and draws back. And the bridge is good in space adaptability, simple in structure and easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of cable laying equipment technology, specifically to a suspended expansion arc compensation device, bridge, and method for laying high-voltage cables along a bridge. Background Technology

[0002] With the rapid advancement of urban power construction, laying high-voltage cables along bridges has become an important method for power transmission across rivers, lakes, and urban transportation bridges. During their service life, bridges are inevitably subject to expansion, contraction, and vibration due to changes in ambient temperature, vehicle loads, and their own structural characteristics. These dynamic changes are directly transmitted to the high-voltage cables laid along the bridge, causing the cables to endure repeated tensile and compressive stresses. If these stresses are not effectively relieved, they will accelerate the deterioration of the cable insulation layer, cause fatigue fracture of the metal sheath, and ultimately lead to cable line faults, seriously affecting the safety and stability of power transmission.

[0003] To address the aforementioned issues, relevant high-voltage cable expansion joint compensation devices have emerged in the industry. For example, the utility model patent with authorization announcement number CN216819310U discloses a compact and highly standardized compensation device. Through the hinged cooperation of the linear travel mechanism, the hoisting bracket, and the cable bracket, it achieves multi-directional degree of freedom adjustment, effectively solving the problems of traditional compensation devices having high installation space requirements and being unsuitable for small bridge expansion joints. Furthermore, it has achieved product localization, significantly reduced project costs, and accelerated project construction progress. It has been well applied in bridge scenarios with expansion joints of less than 120mm.

[0004] However, in practical engineering applications, it has been found that the compensation device disclosed in CN216819310U still has key technical defects: it lacks an effective relative motion limiting mechanism, resulting in a lack of constraint on the movement trajectory of the compensation device during bridge expansion and contraction, with the overall movement concentrated on the side far from the bridge expansion joint. This non-uniform movement characteristic causes the deformation and stress distribution of the high-voltage cable to be significantly uneven. Local areas of the cable must withstand stress loads far exceeding the design threshold. Under such conditions for a long time, the weak points of the cable are prone to irreversible damage. This not only fails to fully utilize the stress relief function of the compensation device but also accelerates the deterioration of the cable, shortens its service life, and makes it difficult to meet the requirements for the long-term safe and stable operation of high-voltage cables.

[0005] Currently, there is no existing technology that can specifically solve the problem of uneven stress distribution. There is an urgent need to develop a new type of compensation device that can effectively control the relative movement range between the bridge body and the compensation device, and balance the cable deformation and stress distribution, so as to make up for the shortcomings of the existing technology and ensure the safety and reliability of high-voltage cables laid with the bridge. Summary of the Invention

[0006] To address the shortcomings of the aforementioned background technology, the present invention aims to provide a simple, easy-to-install, and applicable high-voltage cable suspension expansion arc compensation device, bridge, and method for laying cables along bridges in inland rivers, lakes, and urban transportation.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, the present invention provides a suspended expansion arc compensation device for high-voltage cables laid along bridges, the compensation device comprising: The linear travel mechanism is fixed to the inner surface of the top of the bridge body; A catenary assembly, the top of which is hinged to the linear travel mechanism; A cable support assembly, the top of which is hinged to the bottom of the catenary assembly; A limiting component is located below the cable support component and is inserted into the bridge bottom beam to limit the range of relative movement between the bridge body and the compensation device.

[0008] As a preferred embodiment of the present invention, the limiting component includes a portal plate, a portal plate support, and a limiting plate. The top of the portal plate is rigidly connected to the cable support component through the portal plate support. The limiting plate is disposed on the inner surface of the portal plate. The portal plate is inserted into the bridge bottom beam. The bridge bottom beam has a limiting distance with the limiting plate in the bridge expansion and contraction direction.

[0009] As a preferred embodiment of the present invention, the bridge bottom beam is fixed to the inner surface of the side wall of the bridge body, and its length direction is perpendicular to the length direction of the bridge body; a bridge expansion joint is provided at one end of the bridge body, and the limiting distance from the other end of the bridge body to the bridge expansion joint increases sequentially.

[0010] As a preferred embodiment of the present invention, the linear travel mechanism includes at least one set of tracks and two pulleys, the two pulleys being connected by a pulley linkage, and the pulley linkage being hinged to the top of the catenary assembly; both ends of the track are provided with baffles to prevent the pulleys from slipping.

[0011] As a preferred embodiment of the present invention, the catenary assembly includes at least one set of sequentially connected rod hangers, connecting hangers, ball-head hangers, cup-head hangers, and length-adjustable connectors, wherein the rod hangers are hinged to the pulley rod.

[0012] As a preferred embodiment of the present invention, the length-adjustable connector includes an upper bracket and a lower bracket. The upper bracket is provided with a plurality of bolt holes distributed along its length direction, and the overall length can be adjusted by selecting different hole positions to connect with the lower bracket.

[0013] As a preferred embodiment of the present invention, the cable support assembly includes: Supporting steel plate; Two connecting plates are symmetrically arranged on both sides of the width direction of the supporting steel plate; Multiple transition plates are used to connect the connecting plate and the supporting steel plate; A cable fixing base is provided on the upper surface of both ends of the supporting steel plate along its length, and is used to fix the high-voltage cable.

[0014] As a preferred embodiment of the present invention, the supporting steel plate is composed of two symmetrical downward inclined steel plates, the connecting plate is in the shape of an isosceles obtuse triangle, the apex of the connecting plate is hinged to the bottom end of the catenary assembly, and the two bottom corners of the connecting plate are respectively connected to the inclined steel plate through transition plates.

[0015] Secondly, the present invention provides a bridge, including a bridge body, a bridge bottom beam and a laid high-voltage cable. The bridge body is provided with a plurality of compensation devices as described above at intervals along its length. The high-voltage cable passes through the cable fixing seat of the compensation device in a vertical serpentine path.

[0016] Thirdly, the present invention provides an installation method for a cable expansion arc compensation device laid along a bridge, comprising the following steps: The linear travel mechanism, catenary assembly, cable support assembly, and limit assembly are pre-assembled; An installation position is pre-set on the top of the bridge main body, and the assembled linear travel mechanism is fixed in the installation position; The assembled catenary assembly, cable support assembly, and limiting assembly are hoisted to the installation position, the limiting assembly is connected to the bottom beam of the bridge, and the cable support assembly is hinged to the linear travel mechanism through the multi-degree-of-freedom suspension assembly to complete the installation of a single compensation device. The steps are repeated to install multiple compensation devices at intervals along the length of the bridge. The high-voltage cables are sequentially threaded into the cable support assemblies of each compensation device and fixed in place, forming a serpentine laying pattern.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention precisely controls displacement by interlocking a limiting component (gantry plate + gantry plate bracket + limiting plate) with the bridge bottom beam, completely solving the problems of motion concentration and uneven stress, protecting the cable body structure, and setting the limiting distance differently according to the distribution law of bridge expansion and contraction displacement, achieving two key functions: accurately constraining the relative movement range of the bridge body and the compensation device, avoiding the movement of the compensation device concentrated on the side away from the expansion joint as in the prior art (CN216819310U), eliminating the problem of local stress overload of the cable from the root; through the matching design of displacement-limiting distance, the cable deformation is evenly distributed to the corresponding sections of each compensation device, avoiding the deterioration of the cable insulation layer due to local excessive stretching / compression, or fatigue fracture of the metal sheath, significantly extending the service life of the cable.

[0018] 2. The installation method of the present invention (pre-assembly + hoisting and docking + batch installation) has significant engineering practicality: Pre-assembly: The linear travel mechanism, catenary assembly, cable support assembly, and limiting assembly can be pre-assembled in the factory, reducing the workload of on-site welding and debugging, and avoiding the impact of the environment (such as high-altitude bridge operations and severe weather) on on-site construction; Batch adaptation: When installing multiple compensation devices at intervals along the length of the bridge, only the steps of hoisting and docking - adapting the limiting assembly to the bottom beam - cable threading and fixing need to be repeated, and the structure of each component is standardized (such as the bolt holes of the length adjustable connector and the uniform specifications of the cable fixing seat), which can be mass-produced and installed, greatly shortening the construction cycle and reducing labor and time costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the compensation device in this invention; Figure 2 This is a schematic diagram of the left-side structure of the compensation device in this invention; Figure 3 This is a schematic diagram of the front view of the linear travel mechanism in this invention; Figure 4 This is a schematic diagram of the left-side structure of the linear travel mechanism in this invention; Figure 5 This is a schematic diagram of the main structure of the catenary assembly in this invention; Figure 6 This is a schematic diagram of the left-side structure of the catenary assembly in this invention; Figure 7 This is a schematic diagram of the main structure of the adjustable-length connector in this invention; Figure 8 This is a schematic diagram of the left-side structure of the adjustable-length connector in this invention; Figure 9 This is a schematic diagram of the main structure of the cable support assembly in this invention; Figure 10 This is a schematic diagram of the left-side structure of the cable support assembly in this invention; Figure 11 This is a schematic diagram of the front view structure of the limiting component in this invention; Figure 12 This is a schematic diagram of the left-side structure of the limiting component in this invention; Figure 13 This is a schematic diagram of the main structure of the compensation device installed on the bridge in this invention; Figure 14 This is a schematic diagram of the left-side structure of the compensation device installed on the bridge in this invention; Figure 15 This is a left-side view of the structure of the compensation device installed on a bridge in one embodiment of the present invention.

[0020] Reference numerals: 1-Bridge main body, 2-Compensation device, 21-Linear travel mechanism, 211-Rail, 212-Pulley, 213-Pulley connecting rod, 22-Chassis assembly, 221-Connecting rod hanging plate, 222-Connecting hanging plate, 223-Ball head hanging plate, 224-Bowl head hanging plate, 225-Length adjustable connector, 2251-Upper support, 2252-Lower support, 23-Cable support assembly, 231-Connecting plate, 232-Transition plate, 233-Supporting steel plate, 234-Cable fixing seat, 24-Limiting assembly, 241-Gate plate bracket, 242-Gate plate, 243-Limiting plate, 3-Bridge bottom beam, 4-High voltage cable, 5-Expansion joint, 6-1#Compensation device, 7-2#Compensation device, 8-3#Compensation device, 9-4#Compensation device. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. For those skilled in the art, the omission of certain well-known structures and their descriptions in the drawings is understandable. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0022] like Figures 1-12 As shown, this embodiment of the invention provides a suspended telescopic arc compensation device for high-voltage cables laid along a bridge, including a linear travel mechanism 21, a catenary assembly 22, a cable support assembly 23, and a limiting assembly 24.

[0023] In one specific embodiment of the present invention, such as Figure 3 and Figure 4As shown, the linear travel mechanism 21 is fixed to the inner top surface of the bridge body 1. Specifically, the linear travel mechanism 21 includes a track 211 and two opposite and parallel pulleys 212. The two pulleys 212 are respectively bolted to the left and right ends of the pulley connecting rod 213, and the pulley connecting rod 213 is hinged to the top of the catenary assembly 22. Baffles are provided at both the front and rear ends of the track 211 to prevent the pulleys 212 from slipping.

[0024] In the above scheme, the baffle design at both ends of the track 211 of the linear travel mechanism 21 can effectively prevent the pulley 212 from slipping off the track 211 when the bridge is in severe expansion, contraction or vibration, thus avoiding the cable pulling and breaking accident caused by the overall detachment of the compensation device 2, providing a safety guarantee for the long-term stable operation of the device, and is especially suitable for urban bridge scenarios with heavy traffic and frequent vibration.

[0025] In one specific embodiment of the present invention, such as Figure 5 and Figure 6 As shown, the top of the catenary assembly 22 is hinged to the linear travel mechanism 21. Specifically, the catenary assembly 22 includes a connecting rod plate 221, a connecting plate 222, a ball-end plate 223, a cup-end plate 224, and a length-adjustable connector 225 connected in sequence. The connecting rod plate 221 is hinged to the pulley connecting rod 213. Figure 7 and Figure 8 As shown, the length-adjustable connector 225 includes an upper bracket 2251 and a lower bracket 2252. The upper bracket 2251 is provided with a plurality of bolt holes distributed along its length direction. By selecting different hole positions to connect with the lower bracket 2252, the overall length can be adjusted to adapt to the installation space of different bridges.

[0026] In the above scheme, the ball-head mounting plate 223 has a ball-head structure, and the bowl-head mounting plate 224 has a bowl-shaped structure. The two can rotate 360 ​​degrees to resist vibrations transmitted from all directions of the bridge and reduce the impact on the high-voltage cable 4. The connecting rod mounting plate 221, ball-head mounting plate 223, bowl-head mounting plate 224, and length-adjustable connector 225 are all made of carbon steel, while the connecting mounting plate 222 is made of aluminum alloy (a non-magnetic material). Since the entire device will actually form a closed loop around the high-voltage cable 4, the aluminum alloy connecting mounting plate 222 can reduce the eddy current loss and heat generation generated by the closed loop around the high-voltage cable 4.

[0027] In one specific embodiment of the present invention, such as Figure 9 and Figure 10As shown, the top of the cable support assembly 23 is hinged to the bottom of the catenary assembly 22. Specifically, the cable support assembly 23 includes a support steel plate 233, a connecting plate 231, a transition plate 232, and a cable fixing seat 234. Two connecting plates 231 are symmetrically arranged on both sides of the support steel plate 233 in the width direction. Multiple transition plates 232 are used to connect the connecting plates 231 and the support steel plate 233. The cable fixing seat 234 is located on the upper surface of the front and rear ends of the support steel plate 233 in the length direction and is used to fix the high-voltage cable 4. The support steel plate 233 is composed of two symmetrical downward-sloping steel plates. The connecting plate 231 is shaped like an isosceles obtuse triangle. The apex of the connecting plate 231 is hinged to the bottom of the catenary assembly 22, and the two base corners of the connecting plate 231 are connected to the inclined steel plates through the transition plates 232.

[0028] In one specific embodiment of the present invention, such as Figure 11 and Figure 12 As shown, the limiting component 24 is located below the cable support component 23 and is inserted into the bridge bottom beam 3 to limit the range of relative movement between the bridge body 1 and the compensation device 2. Specifically, the limiting component 24 includes a portal plate 242, a portal plate bracket 241, and a limiting plate 243. The top of the portal plate 242 is rigidly connected to the cable support component 23 through the portal plate bracket 241. The limiting plate 243 is located on the inner surface of the portal plate 242. The portal plate 242 is inserted into the bridge bottom beam 3, and there is a limiting distance between the bridge bottom beam 3 and the limiting plate 243 in the bridge expansion and contraction direction.

[0029] In the above scheme, the limiting stability is high: the portal plate 242 is rigidly connected to the cable support assembly 23 through the portal plate bracket 241, ensuring that the limiting assembly 24 moves synchronously with the cable support assembly 23, avoiding control failure caused by loosening of the limiting structure; precise displacement control: the portal plate 242 is plugged into the bridge bottom beam 3, and a limiting distance is reserved between the bridge bottom beam 3 and the limiting plate 243, which can accurately constrain the maximum displacement of the compensation device 2, preventing the cable from deteriorating its insulation layer or breaking its metal sheath due to excessive stretching / compression; convenient installation: the plug-in design does not require complex welding or bolt fixing. During on-site installation, only the portal plate 242 and the bridge bottom beam 3 need to be connected, reducing the difficulty of high-altitude operations and improving construction efficiency.

[0030] Furthermore, the bridge bottom beam 3 is fixed to the inner surface of the side wall of the bridge body 1, and its length direction is perpendicular to the length direction of the bridge body 1; a bridge expansion joint 5 is provided at one end of the bridge body 1, and the limiting distance from the other end of the bridge body 1 to the bridge expansion joint 5 increases sequentially.

[0031] The above scheme clarifies the distribution pattern of the position and limiting distance of the bridge bottom beam 3, which has the following advantages: Adaptability to bridge structure: The bridge bottom beam 3 is fixed to the inner surface of the side wall of the bridge main body 1 and its length direction is perpendicular to the main body. Its insertion fit with the portal plate 242 better conforms to the internal spatial layout of the bridge, avoiding the bottom beam occupying the cable laying channel; Gradient stress dispersion: The limiting distance increases sequentially along the other end of the bridge main body 1 towards the expansion joint 5, accurately matching the displacement distribution pattern during bridge expansion and contraction (smaller displacement near the expansion joint 5 and larger displacement further away), ensuring uniform distribution of deformation and stress in each cable segment, completely solving the problem of uneven stress caused by displacement concentration in existing technologies; Strong scenario adaptability: The gradient limiting is designed for the displacement characteristics of small bridge expansion joints 5 (such as below 120mm), allowing for adaptation to compensation devices 2 at different positions without additional adjustments, resulting in high versatility.

[0032] like Figures 13-14 As shown, an embodiment of the present invention provides a bridge, including a bridge body 1, a bridge bottom beam 3 and a laid high-voltage cable 4. Multiple compensation devices 2 are arranged at intervals along the length direction inside the bridge body 1, and the high-voltage cable 4 passes through the cable fixing seat 234 of the compensation device 2 in a vertical serpentine path.

[0033] Based on the above structural design, the present invention also provides an installation method for a cable expansion arc compensation device laid along a bridge, comprising the following steps: The linear travel mechanism 21, the catenary assembly 22, the cable support assembly 23, and the limit assembly 24 are pre-assembled; An installation position is pre-set on the top of the bridge body 1, and the assembled linear travel mechanism 21 is fixed in the installation position; The assembled catenary assembly 22, cable support assembly 23 and limiting assembly 24 are hoisted to the installation position, so that the limiting assembly 24 is connected to the bridge bottom beam 3, and the cable support assembly 23 is hinged to the linear travel mechanism 21 through the multi-degree-of-freedom suspension assembly to complete the installation of a single compensation device 2. Repeat the steps to install multiple compensation devices 2 at intervals along the length of the bridge. The high-voltage cable 4 is sequentially threaded into the cable support assembly 23 of each compensation device 2 and fixed to form a serpentine laying pattern.

[0034] In this invention, the expansion and contraction of the bridge body 1 will cause the arc segment of the high-voltage cable 4 to undergo stretching or compression, specifically manifested in the sag change of the cable during its serpentine laying. Throughout the process, the compensation device 2 can balance the movement and sag change of each section of the high-voltage cable 4 by displacing along the direction of travel of the bridge body 1, and uniformly distribute the stress generated by the expansion and contraction and vibration of the bridge body 1 onto the high-voltage cable 4.

[0035] The present invention provides a method for calculating the limiting distance as follows: According to the data collection and settlement, the maximum design expansion joint length of the bridge is confirmed to be X mm.

[0036] In accordance with relevant regulations and standards, and with reference to conventional design schemes for previous high-voltage power cable line projects, in order to meet the requirements of ensuring the normal and safe operation of the cable during bridge expansion and contraction, the installation area of ​​compensation device 2 is set with a length of 37.5m, the fixed pitch of the cable is 7.5m, the cable is divided into 5 sections, and 4 sets of compensation devices 2 are installed.

[0037] Based on the 1:1 full-scale test results, the cable displacement under external force is not uniformly distributed and tends to concentrate at compensation device #4 (9). Therefore, referring to the test results, the device was optimized, and limiting components 24 were installed at compensation devices #2, #3, and #4 respectively. Figure 15 As shown.

[0038] When the bridge expands or contracts by X mm: the relative displacement between compensation device 1 (6) and the bridge body is 4 / 5X mm; the relative displacement between compensation device 2 (7) and the bridge body is 3 / 5X mm; the relative displacement between compensation device 3 (8) and the bridge body is 2 / 5X mm; and the relative displacement between compensation device 4 (9) and the bridge body is 1 / 5X mm. Based on this, the specifications of each limiting component 24 are set as follows: compensation device 1 (6) has no limiting component 24; the limiting distance of compensation device 2 (7) is 3 / 5X mm; the limiting distance of compensation device 3 (8) is 2 / 5X mm; and the limiting distance of compensation device 4 (9) is 1 / 5X mm.

[0039] This invention features multiple hinge structures to achieve multi-directional degree of freedom adjustment, effectively absorbing the deformation and vibration of the cable caused by the expansion and contraction of the bridge. The device can limit the maximum range of cable sag variation with bridge expansion and contraction, ensuring that the cable maintains good performance during bridge expansion and contraction. It also has good adaptability to bridge space and a simple structure that is easy to maintain.

[0040] Based on the description and accompanying drawings of this invention, those skilled in the art can readily manufacture or use the suspended expansion arc compensation device, bridge, and method for high-voltage cable laying along a bridge, and can achieve the positive effects described in this invention.

[0041] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0042] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A suspended expansion arc compensation device for high-voltage cables laid along a bridge, characterized in that, The compensation device (2) includes: A linear travel mechanism (21) is fixed to the inner surface of the top of the main body of the bridge (1); The catenary assembly (22) has its top end hinged to the linear travel mechanism (21); The top end of the cable support assembly (23) is hinged to the bottom end of the catenary assembly (22); The limiting component (24) is located below the cable support component (23) and is inserted into the bridge bottom beam (3) to limit the range of relative movement between the bridge body (1) and the compensation device (2).

2. The high-voltage cable suspension expansion arc compensation device for bridge laying according to claim 1, characterized in that, The limiting component (24) includes a portal plate (242), a portal plate bracket (241), and a limiting plate (243). The top of the portal plate (242) is rigidly connected to the cable support component (23) through the portal plate bracket (241). The limiting plate (243) is disposed on the inner surface of the portal plate (242). The portal plate (242) is inserted into the bridge bottom beam (3). The bridge bottom beam (3) has a limiting distance between itself and the limiting plate (243) in the bridge expansion direction.

3. The high-voltage cable suspension expansion arc compensation device for bridge laying according to claim 2, characterized in that, The bridge bottom beam (3) is fixed to the inner surface of the side wall of the bridge body (1), and its length direction is perpendicular to the length direction of the bridge body (1); a bridge expansion joint (5) is provided at one end of the bridge body (1), and the limiting distance from the other end of the bridge body (1) to the bridge expansion joint (5) increases sequentially.

4. The high-voltage cable suspension expansion arc compensation device for bridge laying according to claim 1, characterized in that, The linear travel mechanism (21) includes at least one set of tracks (211) and two pulleys (212). The two pulleys (212) are connected by a pulley link (213), and the pulley link (213) is hinged to the top of the catenary assembly (22). Both ends of the track (211) are provided with baffles to prevent the pulleys (212) from slipping.

5. The high-voltage cable suspension expansion arc compensation device for bridge laying according to claim 4, characterized in that, The catenary assembly (22) includes at least one set of sequentially connected rod plate (221), connecting plate (222), ball head plate (223), cup head plate (224) and length adjustable connector (225). The rod plate (221) is hinged to the pulley connecting rod (213). The ball head plate (223) and the cup head plate (224) can rotate 360 ​​degrees. The connecting plate (222) is made of aluminum alloy.

6. The high-voltage cable suspension expansion arc compensation device for bridge laying according to claim 5, characterized in that, The length-adjustable connector (225) includes an upper bracket (2251) and a lower bracket (2252). The upper bracket (2251) is provided with a plurality of bolt holes distributed along its length direction. The overall length can be adjusted by selecting different hole positions to connect with the lower bracket (2252).

7. The high-voltage cable suspension expansion arc compensation device for bridge laying according to claim 1, characterized in that, The cable support assembly (23) includes: Support steel plate (233); Two connecting plates (231) are symmetrically arranged on both sides of the width direction of the supporting steel plate (233); Multiple transition plates (232) are used to connect the connecting plate (231) and the supporting steel plate (233). The cable fixing seat (234) is located on the upper surface of the front and rear ends of the support steel plate (233) along the length direction, and is used to fix the high voltage cable (4).

8. The high-voltage cable suspension expansion arc compensation device for bridge laying according to claim 7, characterized in that, The supporting steel plate (233) is composed of two symmetrical downward inclined steel plates. The connecting plate (231) is in the shape of an isosceles obtuse triangle. The apex of the connecting plate (231) is hinged to the bottom end of the catenary assembly (22). The two bottom corners of the connecting plate (231) are respectively connected to the inclined steel plate through transition plates (232).

9. A bridge, characterized in that, The bridge includes a main body (1), a bridge bottom beam (3) and a high-voltage cable (4) laid therein. Multiple compensation devices (2) as described in any one of claims 1-8 are arranged at intervals along the length of the main body (1). The high-voltage cable (4) passes through the cable fixing seat (234) of each compensation device (2) in a vertical serpentine path.

10. A method for installing a cable expansion arc compensation device during bridge laying, characterized in that, Includes the following steps: The linear travel mechanism (21), the catenary assembly (22), the cable support assembly (23), and the limit assembly (24) are pre-assembled. The assembled linear walking mechanism (21) is fixed in the installation position at the top of the bridge body (1); The assembled catenary assembly (22), cable support assembly (23) and limiting assembly (24) are hoisted to the installation position, so that the limiting assembly (24) is connected to the bridge bottom beam (3), and the cable support assembly (23) is hinged to the linear travel mechanism (21) through the multi-degree-of-freedom suspension assembly to complete the installation of a single compensation device (2). Repeat the steps to install multiple compensation devices (2) at intervals along the length of the bridge. The high-voltage cable (4) is sequentially threaded into the cable support assembly (23) of each compensation device (2) and fixed to form a serpentine laying pattern.

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