Note for space frame structure nodes

The method of space frame structure ball nodes is divided into two types: welding ball and bolt ball. The bolt ball uses a high -strength bolt to tighten the connection, and the welding ball uses on -site welding connection.

1. The manufacturers of the bolt ball node parts are different. Receive data information information should be obtained before promoting.
2. The ingredients of the central bearing steel ball, high -strength bolt, sleeve specifications, tight screws, cones or daily raw materials of the central bearing steel ball, high -strength bolt, sleeve specifications, tight screws, cones or daily limit requirements shall meet the requirements of the design and specifications of the scheme.
3. The level of high -strength bolts in the bolt nodes shall be selected separately according to the model specifications.
4. The diameter of the bolt ball should ensure that the bar screws of the adjacent places do not hit the sphere and meet the requirements of the surface layer of the sleeve specification.
5. The cone at the top of the pole of the bolt ball node adopts a welding connection, and the bearing capacity of the space frame manufacturer in connecting welding should be less than the steel pipe. Both the cut section of the cone and the daily limit shall be calculated according to the actual bearing capacity specifications.
6. Welding balls are generally welded by two hemisphere welded. It is necessary to establish a rib for setting whether to set up whether to set up the ribs according to the ability specifications.
7. The ratio of the diameter of the welding ball to the thin thickness, the ratio of the ball diameter to the main steel pipe diameter, the ratio of the thickness of the ball wall to the main steel pipes must be regulated: the ratio of the ball diameter to the wall thickness should be 25 ~ 45 The ratio of the diameter to the main steel pipe should be taken 2.4 ~ 3.0, and the ratio of the thickness of the ball wall to the main steel pipe should be 1.5 ~ 2.0, and the thickness of the ball wall should not be less than 4mm.
8. The welding ball and the steel pipe should be used to take the welding seam of the slopes, and the middle gap between the steel pipe and the ball should be used in the middle to ensure that the welded welding guarantee is strong.
9. When the number of welding ball nodes is too large, in order to reduce the junction of a part of the ball diameter, the structure requirements of the specified regulations should be met: the axis of all exchange rods should be as much as possible in accordance with the center line of the ball; At the same time, the large cross section is welded on the ball as much as possible (when the cross -section of the two rods is the same, the supporting frame is replaced). The other rod is welded on the rod, but it should be guaranteed that 3/4 of the section of the section should be welded on the ball, and the ribs should be set as required.