During the construction of metal sheet curtain walls, self-tapping screws are mainly used to directly fix the panel to the frame, or after the plate is folded and angle aluminum is added, the panel is fixed to the connector using self-tapping screws to fix the angle aluminum.
The metal plate curtain wall is composed of metal plates as panels and a supporting structure system. It is a decorative structure for the building's exterior that does not share the effects of the main structure of the building and has a certain displacement capacity. Aluminum alloy panels are the most commonly used metal panels for curtain walls. The metal panels are used as decorative surface layers and are connected to the main body of the building through metal frames and adapters behind the panels. The system also includes fire protection, lightning protection, thermal insulation, sound insulation, Structure required for ventilation, shading and other functions.
Under the standard value of wind load or standard value of gravity load, the curtain wall should meet the following requirements: the maximum bending deformation of aluminum profile members should be controlled at ≤L/180, and the maximum deformation of steel profile members should be controlled Control it at ≤L/250; the maximum bending deformation of the plate should be controlled at ≤L/60; the starting point of the standard wind load value is not less than 1.0kPa, which is calculated specifically in accordance with the provisions of GB50009 "Load Code for Building Structures"; the open curtain wall should be considered to act on Wind loads on building envelope.
Metal plate curtain wall performance requirements
Water-tight performance: The water-tight performance index of the curtain wall can be calculated according to GB/T21086-2007 (the fixed part of the curtain wall in areas hit by tropical storms and typhoons is taken The value should not be less than 1000Pa, and the fixed part in other areas should not be less than 700Pa); the watertight performance classification index value of the curtain wall can be found in the GB/T21086-2007 table; in the on-site water spray test of the building curtain wall with watertightness requirements, water leakage should not occur; The watertight performance of open building curtain walls is not required.
Thermal insulation performance: The heat transfer coefficient of the curtain wall is proposed in accordance with relevant national standards and specifications. The open curtain wall itself does not have the function of thermal insulation; when using an open curtain wall, the thermal insulation performance of the overall building envelope should be considered. The design of the heat transfer coefficient of the building exterior wall should be calculated and determined in accordance with the provisions of GB50176, and should meet the requirements of GB50189, JGJ132-2001, JGJ134, JGJ26 and JGJ75.