Winding helical wire spoiler for suppressing cross-wind vibration of steel pipe tower web

Abstract

The invention discloses a winding type helical wire spoiler for suppressing transverse wind direction vibration of a steel pipe tower web, comprising a helical wire helically wound on the outer wall of the web, both ends of the helix are clamped to the web The positioning piece on the outer wall of the rod and corresponding to the end of the helix is ​​connected; the cross-section of the helix is ​​an angular structure, and the cross-sectional area along the length direction gradually becomes larger or smaller. The present invention adopts the winding type helical spoiler of the above-mentioned structure to suppress the vibration of the steel pipe tower web bar in the cross-wind direction. The helix is ​​wound on the web bar by spiraling 360° along the length direction, so as to break the wake Karman vortex of the web bar and adjust the web bar. The cross-sectional shape and mass distribution of the upper and lower rods, and the reduction of vortex correlation at different heights have multiple functions, thereby completely suppressing the transverse wind vibration of the web rod.

Description

technical field [0001] The invention relates to a technology for suppressing the wind direction vibration of the steel pipe tower web, in particular to a winding spiral spoiler for suppressing the transverse wind vibration of the steel pipe tower web. Background technique [0002] Lattice steel pipe tower is a kind of lattice tower whose main components are steel pipes, and other parts are made of steel pipes or section steel. It is a support structure for overhead transmission lines to support conductors and lightning protection lines. In the 1980s, many countries in the world began to apply steel pipe profiles to the tower structure when developing UHV transmission lines, and steel pipe towers with steel pipes as the main material of the tower body appeared. The steel pipe tower structure has been well developed in lines of different voltage levels due to its outstanding advantages such as high section stiffness, good section force characteristics, simple force load, and b...

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Problems solved by technology

[0013] Existing aerodynamic measures for wind power towers, such as helical spoilers, cannot be directly used for the across-wind vibration suppression of lattice steel pipe towers. This is because: on the one hand, the cross-sectional dimensions (a few centimeters to a dozen centimeters) is much smaller than the cross-sectional size of the wind power tower (2 to 3.5 meters), and the structural parameters of the two structures (such as: elastic modulus, stiffness, mass per unit length, mode) and wind load The frequency of vortex shedding under the action is far different from the range of Reynolds number; on the other hand, the mechanism of transverse wind vibration of steel pipe tower oblique web bars is far more complicated than that of wind power towers, except that the wind blows to the structure itself to generate vortex shedding and cause transverse vibration. In addition to the vortex induced resonance in the wind direction, when the target rod is in the vortex wake area of ​​the flow field in front of the rod, the periodically shedding vortices generated by the flow field around the rod in front will also excite the target rod to produce cross-wind vortex resonance, so , under multi-party excitation, a single vibration reduction method cannot completely solve the problem of cross-wind vibration of the diagonal web; thirdly, the web members of the lattice steel pipe tower are relatively thin, and the vibration frequency is relatively high under the action of wind load. It is used for end-by-end splicing of wind power towers and then pasted. When the helical wire is used for the inclined web of lattice steel pipe tower, the fixation is not reliable, and it is easy to fall off after long-term vibration.

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