CN-121983895-A - Self-adaptive temperature control system of large-span cable bridge and installation method thereof

CN121983895ACN 121983895 ACN121983895 ACN 121983895ACN-121983895-A

Abstract

A self-adaptive temperature control system of a large-span cable bridge and an installation method thereof comprise a concrete support, a large-span bridge, a movable base, a limiting support, a fixed cable channel, a bridge cable channel, a first movable card, a second movable card, a movable wedge, a linear actuator, a third movable card, a fixed card and a cable, wherein two ends of the large-span bridge are arranged on the concrete support at the corresponding side through the movable base and the limiting support, the fixed cable channel arranged along the extending direction of the cable is arranged inside the concrete support, a through bridge cable channel is formed inside the large-span bridge, and the cable is fixedly laid inside the channel through a plurality of fixed cards. The scheme protects the structural stability of the concrete support and the large-span bridge, and solves the problem of excessive abrasion of cables at the end part of the large-span cable bridge in the prior art.

Inventors

YANG JINHONG
HAN XINGJUN
LI TONGTONG

Assignees

山东鸿丰电力科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260129

Claims (10)

1. A self-adaptive temperature control system for a large-span cable bridge is characterized by comprising a concrete support, a large-span bridge, a movable base, a limiting support, a fixed cable channel, a bridge cable channel, a first movable clamp, a second movable clamp, a movable wedge, a linear actuator, a third movable clamp, a fixed clamp and a cable, wherein both ends of the large-span bridge are arranged on the concrete support at the corresponding side through the movable base and the limiting support, the fixed cable channel arranged along the extending direction of the cable is arranged in the concrete support, a through bridge cable channel is formed in the large-span bridge, the cable is fixedly laid in the channel through a plurality of fixed clamps, the first movable clamp is arranged at a position close to an outlet of the fixed cable channel after the last fixed clamp of the fixed cable channel, the cable is bent from the first movable clamp, the third movable clamp is arranged at a position close to an inlet of the cable channel of the bridge, and the cable arranged in the cable channel is bent from the third movable clamp.
2. The adaptive temperature control system of the large-span cable bridge frame according to claim 1, wherein the second movable clamp, the movable wedge and the linear actuator are arranged in a channel between the first movable clamp and the third movable clamp, the second movable clamp and the movable wedge are arranged in an outlet area of the fixed cable channel, the movable wedge comprises a first wedge body, a second wedge body, a track and a coupler, the track is fixedly arranged on a bottom wall of the outlet of the fixed cable channel along the direction of the fixed cable channel, the first wedge body and the second wedge body are identical and are connected end to end, a sliding body formed by the first wedge body and the second wedge body is integrally arranged on the track in a sliding mode, the coupler is connected to the tail portion of the second wedge body, the linear actuator is connected to the tail portion of the coupler, and the movable section of the linear actuator is fixedly arranged on the bottom wall of the inlet of the cable bridge frame channel.
3. The adaptive temperature control system of a large-span cable bridge frame as set forth in claim 2, wherein the top parts of the first wedge and the second wedge are respectively provided with a wedge surface structure, the wedge surface structure comprises a first wedge surface section, a horizontal section and a second wedge surface section, and the first wedge surface section, the horizontal section and the second wedge surface section are sequentially connected and gradually rise.
4. The adaptive temperature control system of the large-span cable bridge frame according to claim 3, wherein the second movable clamp comprises a base, a guide groove, a guide post, a pressure spring, a movable plate, an upper clamping wheel, a lower clamping wheel and a first jacking wheel, wherein the base is fixedly arranged on the inner wall of the top of an outlet area of a fixed cable channel, the guide groove is fixedly arranged on the base, the guide groove is provided with a rectangular guide groove with a downward vertical opening, the guide post with a rectangular section is slidingly arranged in the guide groove, the movable plate is fixedly arranged at the bottom of the guide post, the pressure spring is sleeved on the periphery of the guide post, one end of the pressure spring is fixedly connected with the bottom of the guide groove, the other end of the pressure spring is fixedly connected with the top of the movable plate, the movable plate is of a vertically extending plate body structure, the upper clamping wheel and the lower clamping wheel are horizontally arranged on the plate body in a rotating manner, cables of which bending sections are penetrated between the upper clamping wheel and the lower clamping wheel are also provided with arc grooves for limiting the cables, the first jacking wheel and the second jacking wheel are arranged at the same height of the position of the lowest part of the movable plate body in a rolling manner, and the first jacking wheel and the second jacking wheel are in a rolling contact with the wedge structure on the first wedge and the second wedge structure of the second wedge body.
5. The adaptive temperature control system of the large-span cable bridge frame as set forth in claim 4, further comprising an active temperature control system formed by an optical fiber temperature sensor, an ambient temperature sensor and a controller, wherein the input end of the controller is connected with the optical fiber temperature sensor and the ambient temperature sensor, the output end of the controller is in control connection with the linear actuator, and when the severe temperature rise inside and outside the large-span cable bridge frame is detected, the controller controls the linear actuator to extend, so that the extension of the linear actuator drives the first jacking wheel and the second jacking wheel to climb through the first wedge section A.
6. The adaptive temperature control system for a large-span cable bridge frame as defined in claim 5, wherein the movable base is arranged at the bottom of one end of the large-span bridge frame, the movable base comprises a plurality of roller bodies perpendicular to the extending direction of the large-span bridge frame, the upper parts of the roller bodies bear the large-span bridge frame through the accommodating structure, the lower parts of the roller bodies are arranged on the limiting support in a rolling manner, and the limiting support is arranged on a stepped boss formed by the concrete support.
7. The adaptive temperature control system of the large-span cable bridge rack of claim 6, wherein the limiting support comprises a limiting plate and a bearing plate, the limiting plate is paved on a stepped boss of the concrete support, the limiting plate is arranged on the periphery of the bearing plate, and the moving base is limited in four directions of front, back, left and right.
8. The adaptive temperature control system of the large-span cable bridge rack of claim 7, wherein the first movable clamp and the third movable clamp have the same structure and comprise a top support, a guide groove, a guide post, a cable pressing spring, a movable support, a cable pressing wheel, a fixed support, a supporting wheel and a bottom support, wherein the top support is arranged on the top wall of the channel, the bottom support is arranged on the bottom wall of the channel at a corresponding position, the fixed support is fixedly arranged on the bottom support, the supporting wheel is rotatably arranged on the fixed support, the guide groove is arranged below the top support, a vertically arranged rectangular guide groove is arranged inside the guide groove, a guide post with a rectangular cross section is arranged in the rectangular guide groove in a sliding mode, the movable support is fixedly arranged at the lower end of the guide post, the cable pressing wheel is rotatably arranged below the movable support, the cable pressing spring is sleeved on the guide post, the upper end of the cable pressing spring is fixedly connected with the bottom of the guide groove, the lower end of the cable pressing spring is fixedly connected with the top of the movable support, and the cable pressing wheel and the supporting wheel are arranged on the upper side and the lower side of the cable.
9. The adaptive temperature control system of the large-span cable bridge frame as set forth in claim 8, wherein the cable pressing wheel and the supporting wheel are arc-shaped groove structures on the periphery for limiting the cable between the cable pressing wheel and the supporting wheel.
10. A method of installing the adaptive temperature control system for a large span cable tray according to any one of claims 1 to 9, comprising the steps of: s1, parameter investigation and calculation, namely, consulting a design file to determine the thermal expansion coefficient and the working temperature change range of the bridge frame material; S2, positioning and fixing the bridge connecting end, namely leveling and fixing a support of the connecting end of the large-span cable bridge and the concrete support, ensuring that a limiting support is firmly attached to a concrete base layer, filling a gap with sealant, and preventing loosening caused by temperature difference; S3, reserving the cable laying and bending sections, namely laying the cable at the middle position of the connecting section of the large-span cable bridge frame and the concrete support according to the calculated reserved length, deliberately reserving an arc-shaped bending section, wherein the bending radius is not smaller than 15 times of the diameter of the cable; S4, temperature adaptation fine adjustment, namely confirming the temperature of an installation site by using a temperature detector, and adjusting the bending degree of the reserved bending section by using a linear actuator according to the relation between the site temperature and the working temperature change range.

Description

Self-adaptive temperature control system of large-span cable bridge and installation method thereof Technical Field The invention belongs to an industrial control system, relates to adaptive temperature control of a cable bridge, and particularly relates to an adaptive temperature control system of a large-span cable bridge and an installation method thereof. Background The large-span cable bridge has wide application in the engineering of power transmission, building electromechanics and the like, the spanning distance can be tens of meters or even longer, and the rigid connection structure of the bridge end and the concrete foundation pile is extremely easy to cause the related problems of thermal expansion and cold contraction when the ambient temperature changes, thereby bringing hidden trouble to the safe operation of the cable. The concrete foundation pile is used as a fixed supporting member, the self thermal expansion coefficient is extremely low, the concrete foundation pile is tightly combined with a foundation, temperature deformation is hardly generated, the cable bridge is made of metal materials, the thermal expansion coefficient and the cold contraction coefficient are far higher than those of concrete, when the environment temperature rises, the bridge body can generate elongation along the length direction due to thermal expansion, shrinkage can occur when the temperature is reduced, and the expansion deformation is particularly remarkable in a large-span structure. Because the end part of the bridge frame is rigidly connected with the concrete foundation pile, an effective buffer space cannot be provided for expansion deformation, and the bridge frame body is forced to generate tiny bending or stretching in the expansion process, so that the cable laid in the bridge frame body is driven to deform synchronously. The cables are usually arranged in a multi-layer or densely laid state in the bridge, when the bridge expands and contracts due to heat and cold, the two ends of the cables are constrained by fixed points of the bridge, and the middle part of the cables is frequently bent or straightened along with deformation of the bridge. When the temperature is increased, the cable is slightly stretched by the elongation of the bridge, the contact pressure between a part of area and the side wall of the bridge is increased, and when the temperature is reduced, the cable is bent due to the shrinkage of the bridge, and the bending part forms continuous friction with the edge and the corner of the bridge. The repeated bending and straightening actions not only can aggravate the mechanical abrasion between the cable sheath and the side wall of the bridge, but also can lead the cable inner conductor and the insulating layer to bear periodic stress change, and under the long-term action, the cable sheath is easy to scratch, thin and even break, and the insulating layer can be aged and accelerated to cause safety accidents such as short circuit, electric leakage and the like when serious. Especially in the region with large day and night temperature difference and obvious seasonal climate change, the shape caused by expansion with heat and contraction with cold is changed frequently, and the abrasion problem of the cable and the side wall of the bridge is more prominent. The longer the long span bridge, the larger the expansion amount generated by thermal expansion and contraction, the angle of bending and stretching force of the cable are also increased, and the abrasion rate is obviously improved. Meanwhile, parts such as supporting pieces, fixing clamps and the like in the bridge frame can generate additional friction with the cable in the deformation process, so that the abrasion degree is further increased. The frequent mechanical action not only affects the service life of the cable, but also increases the operation and maintenance cost, and even can cause power interruption due to cable faults, thereby bringing serious influence to the normal operation of related engineering. Therefore, there is a need to design an adaptive temperature control system for a large-span cable tray and an installation method thereof to solve the problem of excessive wear of cables at the end of the large-span cable tray in the prior art. Disclosure of Invention The invention aims to provide a self-adaptive temperature control system of a large-span cable bridge and an installation method thereof, which are used for solving the technical problems in the prior art. The invention adopts the following technical scheme to realize the aim: the self-adaptive temperature control system for the large-span cable bridge comprises a concrete support, a large-span bridge, a movable base, a limiting support, a fixed cable channel, a bridge cable channel, a first movable clamp, a second movable clamp, a movable wedge, a linear actuator, a third movable clamp, a fixed clamp and a cable, wherein both ends of the large-span bridge ar