Variable slope joint for section of non-filler plate four-piece combined angle steel of power transmission tower

Abstract

The invention discloses a variable slope joint for a section of non-filler plate four-piece combined angle steel of a power transmission tower. The variable slope joint comprises a pedestal plate and upper and lower shoe plates, and is provided with inner covering angle steel and the non-filler plate four-piece combined angle steel, wherein an end part of each non-filler plate four-piece combined angle steel is aligned with an end part of the lower shoe plate; the inner covering angle steel is arranged on the outer sides of the non-filler plate four-piece combined angle steel and the lower shoe plate; the upper section of the inner covering angle steel is connected with the lower shoe plate; the lower section of the inner covering angle steel is connected with the non-filler plate four-piece combined angle steel; the mounting direction of the inner covering angle steel is consistent with the non-filler plate four-piece combined angle steel on the lower part in direction. According to the structure provided by the invention, the filler plate required by a conventional connection mode is not required to be arranged for a four-piece angle steel member while the rigidity and the safety of the variable slope joint are improved, the weight of the entire tower is effectively reduced, the welding workload is reduced, the machining and the construction are convenient, the construction period is shortened, the engineering cost is saved, and the joint has certain economy.

Description

technical field [0001] The invention relates to a variable slope node type of a power transmission tower, especially a special variable slope node connection type adopted by a four-combined angle steel power transmission tower without a filling plate. Background technique [0002] With the rapid development of power grid construction and the gradual increase of voltage level, more and more multi-circuit and UHV transmission lines are being constructed, and the accompanying tower loads are also increasing, and the types of tower components are also diversifying. Single angle steel ( Including large angle steel) can no longer meet the load requirements. For heavy-duty iron towers on mountainous lines, it is the best choice to use four-combined angle steel towers. [0003] In the prior art, the conventional four-combined angle steel tower adopts the seat plate type, and the welded steel plate (the technical term is called "lower shoe plate", hereinafter referred to as this) is...

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Problems solved by technology

[0004] (1) In order to connect the four-combined angle steel, each section of the lower main material needs to be provided with a filler plate of the same thickness as the shoe plate at the slope change node, resulting in heavy weight of the tower, heavy welding workload, and inconvenient processing and construction;

[0005] (2) In order to meet the requirements of the connection between the conventional four-combination angle steel members (the members are connected by filling plates, there are gaps in the thickness of the filling plates), the joints where the four-combination angle steel is directly connected to the shoe plate of the variable slope node lead to sudden changes in stress and stiffness Without strengthening measures, its stiffness is relatively weak

[0006] (3) There is a certain degree of stress and stiffness mutation at the slope-changing node due to the change of the three-dimensional space gradient. At present, the lower shoe plate of this kind of slope-changing node is directly connected to the main material of the square steel. There is no strengthening measure below the slope-changing node, and the stiffness is relatively high. Weak, the safety performance reserve of the slope point is relatively low

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