Analysis Of Design Problems Related To Unitized Curtain Walls

The unitized curtain wall is the product of the industrialization of building products, and the processed unit plate can be directly installed on the bearing system after being transported to the site to achieve a closed state, which represents the future development direction of the building envelope system.

Its composition principle is: the curtain wall is made of a unit component in the factory, which is generally a floor height, or 2-3 floors high, and a unit component is a stressed unit. During installation, the unit assembly is fixed on the floor slab (beam) of the floor, the left and right mullions of the two adjacent unit components in the horizontal direction form a vertical combination rod through the insertion, and the lower frame of the upper unit and the upper frame of the lower unit are combined into a transverse combination rod, so that the load it bears is directly transmitted to the main structure by the mullion of the unit assembly, and its lattice joint is not on the integral member, but the frame of the two adjacent unit components forms a combined rod through the insertion.

According to the difference in the response of unit components under the action of earthquake, the unitized curtain wall can be divided into two types: transverse sliding type and transverse lock type.

The unit glass curtain wall is a frame-supported glass curtain wall that assembles the panels and metal frames (beams and columns) into curtain wall units in the factory, and completes the installation and construction on site in the form of curtain wall units, with a short construction period. According to the exterior effect, it can usually be divided into three forms: hidden frame, open frame and semi-hidden.

1. Hidden frame unit glass curtain wall

Hidden frame unit glass curtain wall vertical section node: the glass surface material is made of hollow tempered LOW-E glass, the glass configuration needs to be determined after structural calculation and thermal calculation, the curtain wall keel is made of aluminum profiles, and the surface treatment of the profile is sprayed with visible fluorocarbon, three coats and two bakes, and indoor powder spraying, (depending on the project requirements). The design adopts a transverse plug-in unit structure system to achieve three sealing performance, the edge protection adopts aluminum alloy edge protection, reflecting the external metal texture lines, in order to avoid the cold bridge at the aluminum alloy edge protection position, the aluminum alloy edge protection and the unit mullion connection increase the heat insulation pad.

2. Glass curtain wall of the exposed frame unit

The dustproof, gasproof and waterproof performance design of the unit glass curtain wall