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Parallel steel wire stay cable rupturing warning method

A technology of stay cables and steel wires, applied in the fields of bridges and building structures, can solve the problems of uncertainty in the fracture life of bridge stay cables, the danger of sudden rupture of stay cables, and the high cost of removing and replacing the stay cables. To achieve the effect of reducing costs, improving security, and avoiding waste of resources

Active Publication Date: 2017-06-20
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has been improved in recent years, it cannot be expected to have the same service life as the structure; secondly, due to the randomness of its load and environmental effects, the fracture life of bridge stay cables is non-deterministic, and it is not known when they will break
[0004] At present, although the health detection and diagnosis technology with life prediction as the core is generally adopted for the cable-stayed cables, as well as the guarantee measures of "testing every three years and replacing every ten years", due to the randomness of the load and the limitation of detection In essence, such detection and replacement measures cannot rule out the risk of sudden breakage of the stay cables.
Since the reasonable and economical replacement time of cable stays cannot be determined, generally bridges usually adopt “replacement when in doubt” and replace them in batches as soon as they are replaced, or even replace the entire bridge, which wastes resources.
If the judgment is inaccurate, the stay cable will break suddenly, and the repair of the bridge damage and the replacement of the stay cable will cost more

Method used

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  • Parallel steel wire stay cable rupturing warning method
  • Parallel steel wire stay cable rupturing warning method
  • Parallel steel wire stay cable rupturing warning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The schematic diagram corresponding to this embodiment is shown in figure 1 . The stay cable in the present invention includes: a high-density polyethylene protective layer 1 and pretreated steel wires 2 and ordinary steel wires 3 wrapped therein. The method provided by the present invention to realize early warning of the breakage of parallel steel wire stay cables is as follows: before adopting conventional methods to make stay cables, stretch some steel wires, and the tension force and variation range are the corresponding design values ​​during the service period of the structure. The number of times is 100,000 times, and the pretreatment steel wire 2 with fatigue damage is obtained; when making the stay cable, the outer layer of the steel wire bundle is placed with the pretreatment steel wire 2, and the pretreatment steel wire 2 is positioned at 6 of the hexagon of the steel bundle. corner.

Embodiment 2

[0021] The schematic diagram corresponding to this embodiment is shown in figure 2 . The difference between this embodiment and the first embodiment is that there are three pretreated steel wires 2 in each stay cable, which are evenly distributed in the three corners of the hexagon of the steel bundle.

Embodiment 3

[0023] The schematic diagram corresponding to this embodiment is shown in image 3 . The difference between this embodiment and Embodiment 1 is that there are two pretreated steel wires 2 in each stay cable, and the pretreated steel wire 2 is located at the outermost layer of the steel wire bundle, and is located at a relative position with respect to the center of the stay cable cross section. .

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Abstract

The invention discloses a parallel steel wire stay cable rupturing warning method and belongs to the technical field of bridges, building structures and the like. Steel wires of a stay cable comprise pretreated steel wires and ordinary steel wires. The pretreated steel wires are obtained after ordinary steel wires are subjected to a certain number of times of fatigue damage. The pretreated steel wires and the ordinary steel wires in the stay cable are different in fatigue life. During a service period of the stay cable, a warning is given out through rupturing of the pretreated steel wires after a period of time, so that the stay cable is immediately and conveniently detached and replaced. According to the parallel steel wire stay cable rupturing warning method, implementing and operating are easy, a manufacturing process for conventional parallel steel wire stay cables is not changed, the cost is slightly increased, the structural safety is improved, and the method has wide application prospects.

Description

technical field [0001] The invention relates to a method for realizing early warning of breakage of parallel steel wire stay cables, and belongs to the technical fields of bridges, building structures and the like. Background technique [0002] Parallel steel wire stay cables made of steel wires have long been widely used in fields such as bridges and buildings, such as stay cables in cable-stayed bridges or suspenders in arch bridges. However, major accidents in which the cable-stayed cables break suddenly and the structures are damaged have not been eliminated. [0003] Taking the stay cables in cable-stayed bridges as an example, the broken statistical life of stay cables so far is 3-16 years, rarely exceeding 20 years. Although it has been improved in recent years, it cannot be expected to have the same service life as the structure; secondly, due to the randomness of its load and environmental effects, the fracture life of bridge stay cables is non-deterministic, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/16G08B21/18
CPCE01D19/16G08B21/187
Inventor 魏建东管曼羽成书普
Owner ZHENGZHOU UNIV