Points for Attention in Deepening Design of Spherical Joints of Steel Space Frame Structure

Steel space frame structure ball joints are divided into two types: welded ball and bolted ball. The bolted ball is fastened by high-strength bolts, and the welded ball is connected by on-site welding.


The following points need to be paid attention to when deepening the design of the ball joint:

(1) There are differences among the manufacturers of bolt ball joint fittings. The fitting data should be obtained before deepening.

(2) The materials of steel balls, high-strength bolts, sleeves, fastening screws, taper heads or sealing plates in bolted ball joints shall meet the requirements of design and specifications.

(3) The grades of high-strength bolts in bolted ball joints should be selected according to specifications.

(4) The diameter of the bolt ball should ensure that adjacent bolts do not collide in the ball and should meet the requirements of the sleeve contact surface.

(5) The cone or sealing plate at the end of the rod in the bolt ball joint is connected by welding, and the bearing capacity of the connection weld should not be lower than the connecting steel pipe; the cone section and the thickness of the sealing plate should be calculated and determined according to the actual force.

(6) The welded ball is generally a hollow ball welded by two hemispheres. It is necessary to determine whether to install stiffeners according to the force.

(7) The ratio of the outer diameter of the welded ball to the wall thickness, the ratio of the outer diameter of the ball to the outer diameter of the main steel pipe, and the ratio of the ball wall thickness to the wall thickness of the main steel pipe need to meet the specifications: the ratio of the outer diameter of the ball to the wall thickness is the best It is 25~45, the ratio of the outer diameter of the ball to the outer diameter of the main steel pipe is preferably 2.4-3.0, the ratio of the wall thickness of the ball to the main steel pipe wall thickness is preferably 1.5-2.0, and the ball wall thickness should not be less than 4mm.

(8) Groove welds should be used to connect the welded ball to the steel pipe, and a gap should be left between the steel pipe and the ball to ensure that the weld penetration is as strong as the steel pipe.

(9) When the number of connecting rods of the welded ball joint is too large, in order to reduce the diameter of the ball, some rods are allowed to meet, but they should meet the structural requirements specified in the specification; all the axes of the intersecting rods must pass through the center line of the ball; , The rod with a large cross-sectional area must be welded to the ball in full section (when the cross-sectional area of  the two rods are equal, take the tension rod), and the groove of the other rod is welded to the intersecting rod, but it should be ensured that 3/4 of the cross-section is welded On the ball, stiffeners should be set as required; for rods with large forces, support plates can be set as required.

LF is a professional manufacturer and engineering company for space frame and steel structure projects.Do you have a construction project we can help with? We are always ready to help you!Website:www.cnxzlf.com

 

 

评论

发表评论

此博客中的热门博文

Shape of steel space frame structure

图片
  The steel space frame  structure can realize various spatial regular shapes such as arches, circles, spherical shells, and saddle shapes, as well as various irregular shapes. Moreover, if the same shape and different structures are compared, the cost of the steel space frame  structure is relatively low. The shape of the steel space frame  structure refers to the regular or irregular changes in the three-dimensional shape of the grid. Due to the special structure of the space frame structure and the high-precision factory manufacturing requirements, the more precise components required for the complex space frame  shape can be processed in the factory. Through the subtle changes in the angle of the screw holes of the bolt ball joints and the changes in the length of the rods, the space frame  structure can be fitted to the complex shape requirements of the architectural modeling.  At present, the space frame structure has almost become "all-match", and all kinds of spatial
阅读全文

Types of steel space frame structure roof

图片
  Steel space frame  structure is widely used in various buildings, such as   stadiums, exhibition halls, high-speed railway station buildings, terminal buildings, large factories, etc.; steel space frame  structure is a large-span steel structure as the main structure; it has poles The parts have the advantages of reasonable force, light weight, good integrity and stability, large space rigidity, good seismic performance, beautiful appearance, and low cost. What are the main types of steel space frame  structures? The first type is composed of triangular pyramid units, and has three forms: triangular pyramid space frame , evacuated triangular pyramid space frame  and honeycomb triangular pyramid space frame . The second type is composed of a plane truss system, which has four forms: two-way orthogonal diagonally placed space frame , two-way orthogonally placed space frame , two-way diagonally diagonally placed space frame  and three-way space frame . The third type is composed of qua
阅读全文

Space frame dome structure

图片
The space frame  dome uses a spherica l dome  as the main structural system, and the outside of the space frame is covered with plates or glass according to different needs. The glass dome can meet the lighting needs of the building. Natural light is filtered into the environment through the glass interface, making the building visually light and transparent. The space frame  dome uses a bolted ball space structure  as the main structure, and the covering material can be divided into blocks according to the size of the modular. Compared with the hyperboloid molding material, the cost is lower. LF is a professional manufacturer and engineering company for space frame and steel structure projects.Do you have a construction project we can help with? We are always ready to help you!Website: www.cnxzlf.com
阅读全文