Novel fabricated cast steel joint of grid structure

Abstract

The invention relates to a novel fabricated cast steel joint, and belongs to the field of innovation of space grid structure joints. The interior of a novel fabricated cast steel ball joint is a cavity. External branch pipes and a steel ball are connected into a whole. The connection between the branch pipes and the steel ball enables the structure to be smooth through fillets. The branch pipes are distributed in the circumferential direction of the steel ball. Four steel pipes of the upper hemisphere obliquely extend outwards, and four steel pipes of the middle hemisphere extend outwards in the axial direction. The middles of the connecting parts between the steel pipes and the steel ball are hollow. Oblique rod pieces in the ball are obtained through topological optimization and is integrated with the outer ball shell. A steel ball surface is provided with a curved surface shape which is obtained by topological optimization calculation by taking the number, the positions and the diameters of the branch pipes as parameters and is matched with the stress of borne steel rods. Topological optimization analysis is carried out on the ball joint, so that the self-weight of the fabricated cast steel ball joint is greatly reduced while various mechanical properties are met.

Description

technical field [0001] The invention belongs to the innovation field of space grid structure nodes, and specifically relates to a new type of assembled cast steel node of grid structure, which is mainly used in grid and grid floor structures of airport terminal buildings, high-speed railway stations, large gymnasiums, etc. middle. Background technique [0002] At present, the grid structure is widely used in airport terminals, high-speed railway stations, World Expo halls, and large stadiums because of its reasonable force, light weight, and low cost. Nodes, as components connecting grid structure members, often account for 20%-50% of the total steel consumption of the structure. Therefore, reasonable nodes can often greatly reduce the cost of construction and improve safety. [0003] Grid structures are commonly used with welded ball joints, bolted ball joints and cast steel ball joints. With the continuous improvement of people's requirements for buildings, prefabricated...

AI Technical Summary

Problems solved by technology

There are three key technologies to realize the manufacture of new cast steel nodes. One is to meet the design goal of lightweight, which is also the focus of the design; the other is to have a beautiful shape. The new nodes are generally used in landmark buildings, not just to reduce the cost , but also need to make people feel beautiful; the third is how to manufacture new nodes, traditional machine tools are difficult to meet the manufacturing requirements, and new methods are needed to solve their manufacturing problems

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