Connection structure and connection method of a cast steel node

Abstract

The invention discloses a connection structure and connection method of a cast steel node. The spring threaded steel column on the connection member passes through the opening hole on the steel pipe for bayonet connection. The structure is simple and the connection strength is high; the connection member body is embedded in the steel pipe The surface at the corresponding position of the part is designed as a wave, and the thermal bonding material is set at the trough in the wave structure. The corresponding position of the inner wall of the steel pipe is designed as a tooth shape. The meshing structure combined with chemical bonding further strengthens the cast steel node and the steel pipe. The connection makes its stress points less susceptible to fracture and deformation due to external forces, improves the structural stress performance, improves structural safety, and solves the problem of stress concentration that is prone to occur in engineering structures after the cast steel node is connected to the steel pipe; the bayonet connection Finally, it is reinforced again by the nut, and after cooling, considering the thermal expansion coefficient of the nut and the threaded steel column material, under the action of thermal expansion and contraction, the nut squeezes the spring threaded steel column to a certain degree of reliability, further strengthening The connection structure of the bayonet part.

Description

technical field [0001] The invention relates to the technical field of connection between prefabricated steel components such as cast steel nodes and their connecting components, in particular to a connection structure of cast steel nodes and a connection method thereof. Background technique [0002] Due to the characteristics of diversified structures, beautiful appearance, short construction period and good applicability, cast steel joints are gradually popularized and used in large-scale steel structure buildings, bridges and other projects in my country, especially when dealing with complex intersection joints. Nodes have unique advantages. Nowadays, cast steel nodes are inseparable from the construction of railway stations, high-speed rail stations, airports, stadiums, and large buildings. The joints are tubular and directly cast, the stress of the steel structure is more reasonable, and the overall structure is more stable, which overcomes the adverse effects of the st...

AI Technical Summary

Problems solved by technology

[0003] At present, in engineering applications, cast steel nodes are often connected with steel pipes to form the entire force-bearing frame. Due to the limitation of casting technology, the wall thickness of cast steel nodes is usually relatively large. For aesthetic considerations, the outer diameter of the joint limbs and connecting steel pipes is usually the same. The way to connect, keep the appearance flat and smooth, which ensures the beauty of the connection point, but also increases the difficulty of connection

At present, the connection methods of cast steel joints are mainly bolted connection and welded seam connection. The bolted connection is prone to corrosion at the joint gap, resulting in connection failure, and the bolts of ordinary bolted connection are loose under long-term dynamic load, and high-strength bolts Slip deformation caused by connection prestress relaxation has limited the application and promotion of bolted connection

Welding seam connection is widely used in the field of steel structure due to the advantages of convenient construction, low construction cost and fast speed, but the welding method still has its shortcomings: due to the high temperature, the heat-affected zone is formed near the weld seam, the metallographic structure of the steel and the mechanical The performance changes, and the material is easy to become brittle; the welding residual stress increases the possibility of brittle failure of the structure, and reduces the stable bearing capacity of the compression bar. At the same time, the residual deformation will also change the size and shape of the component, etc.

Images