High-strength flexible hubbed flange structure

Abstract

The invention provides a high-strength flexible hubbed flange structure, comprising a convex-platform-shaped flange body, wherein a convex part of a convex platform is provided with through holes which are parallel to the axis of the convex part; a flange plate at the bottom of the convex part is provided with a bolt hole which is parallel to the axis; the distance a from the central line of the bolt hole to the edge of the flange body is not less than 1.1 times as much as the diameter of a bolt; and hole diameters of the through holes are different. According to the high-strength flexible hubbed flange structure, the stress of the flange neck part of the flange and the bolt is more reasonable, the thickness of the flange plate is relatively thinned and the steel utilization amount is saved.

Description

technical field [0001] The invention relates to a flange, in particular to a high-strength flexible neck flange structure. Background technique [0002] With the development of long-distance and large-capacity transmission technology, the construction of UHV transmission lines, and the large-scale structure of transmission poles and towers, the application of high-strength steel in steel pipe components and flange connection nodes is becoming increasingly urgent. [0003] Stiffened flanges and non-stiffened flanges are commonly used for the main material connection of existing transmission line steel pipe towers. For non-stiffened flanges, the deformation of the flange plate is relatively large due to the absence of stiffened ribs, and its strength is relatively small; with stiffened flanges, such as figure 1 As shown, there are stiffeners welded on it, which increases the workload of welding, and the welding quality is not easy to guarantee. [0004] The neck flange is a ...

AI Technical Summary

Problems solved by technology

At present, the main materials of high-strength steel pipe towers in power transmission and transformation projects in my country are still mostly connected by high-strength stiffened flanges; some of them use Q345 neck flanges to connect high-strength steel pipes. Although the load-bearing performance meets the requirements, the strength does not match. unreasonable degree

For example, the neck flange used in Japan's power transmission steel pipe tower is a rigid flange, that is, the flange plate is thicker, the rigidity is greater, and there is no warping deformation, which results in a large amount of steel used in the flange as a whole, which is not economical.

[0005] In addition, in other industries such as China's petrochemical industry and Japan's power transmission industry, the connection method between the flange and the steel pipe is commonly used as a plug-in or flat welding connection, that is, there is a gap between the steel pipe and the flange. Two fillet welds, the welding workload is relatively large, the weld grade requirements are low, but the weld quality inspection is difficult, the weld quality is difficult to control, and the two fillet welds are far apart, the actual force is uneven; in addition, The connection method between the flat welding flange and the steel pipe is that the steel pipe is inserted into the flange neck, and it is easy to produce a certain gap between the outer wall of the steel pipe and the inner wall of the flange neck. When the pickling liquid enters the gap between the inner wall of the flat welded flange neck and the outer wall of the steel pipe from the defect, then when galvanizing in the galvanizing pool, the high temperature will make the liquid in the gap turn into gas and expand rapidly, resulting in The pressure increases rapidly and the weld seam bursts, and in severe cases, even the tube bursts

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