Introduction of heart structure
Because the wind load, gravity load and earthquake action on the glass of point-supported glass curtain wall are all transmitted to the glass joint claw through the glass hole, the glass hole is often the position of maximum stress (1), and there are crack sources around the glass hole after opening, which is also the position where the glass is often damaged. Therefore, it is the key to improve the safety of point curtain wall to improve the edge strength of glass hole and reduce the stress of glass hole.
1 patented joint structure (patent number: 3211834.1; ZL) Zhibo United Rotation Center and Glass Thickness Center.
The purpose of joint connection with universal ball joint is to make the joint absorb the wind pressure deformation of glass and reduce the deformation stress. The heart structure makes the deformation center of the glass (that is, the neutral layer, the thickness of the glass) coincide with the center of the joint rotation center line. The deformation stress of glass is the smallest under the same load, as shown in Figure 2.
G glass gravity, N screw ball head support, E eccentricity. G = N, the split joint that bears the torque Ge adopts the reaction method. Around the glass hole, there is a great stress around the glass hole (this stress can not be considered in the current design and calculation). This kind of stress will cause glass damage under the combined action of wind load, deformation and stress.
Our company has developed a patented structure on the heart joint (patent number: ZL 3211834.1), and the thickness of the joint rotation center is consistent with the glass center line (Figure 4). This eccentricity e is zero and the additional torque t is zero, which reduces the stress around the hole glass.
2. Choosing small aperture joint is beneficial to improve the strength of glass hole edge, especially for irregular glass, small aperture is more beneficial to improve the strength of glass hole edge. Our factory has introduced various aperture connectors for users to choose.
In order to reduce the machining accuracy and production cost, the existing Bojie parts factory installed a rubber washer at the back of the joint. Because of the aging of rubber, it will do great harm to the present in a few years. The constant joint can rotate the ball head, and the ball head adopts bearing structure, all of which are connected by stainless steel metal, and is provided with elastic mechanism, which can not only ensure the flexible rotation of the ball head, but also absorb the vibration of the curtain wall.