Winding type spiral line spoiler for restraining wind direction vibration of steel pipe tower web member

Abstract

The invention discloses a winding type spiral line spoiler for restraining wind direction vibration of a steel pipe tower web member. The winding type spiral line spoiler comprises a spiral line spirally wound on the outer wall of the web member, wherein the two ends of the spiral line are connected with positioning pieces which are clamped to the outer wall of the web member and correspond to the ends of the spiral line; and the cross section of the spiral line is of a corner angle structure, and the cross section area in the length direction is gradually increased or decreased. According to the winding type spiral line spoiler for restraining wind direction vibration of the steel pipe tower web member, the spiral line is spirally wound on the web member in the length direction by 360 degrees, multiple effects of breaking web member wake flow Karman vortexes, adjusting the upper and lower section shapes and mass distribution of the web member, reducing correlation of vortexes of different heights and the like are achieved, and therefore transverse wind direction vibration of the web member is thoroughly restrained.

Description

technical field [0001] The invention relates to a technique for suppressing wind direction vibration of a steel pipe tower web, in particular to a winding spiral spoiler for suppressing wind direction vibration of a 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 beautiful appea...

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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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