The unitized curtain wall is composed of many independent units. All the plate installations and the joint sealing between the plates are processed and assembled in the factory. Construction is carried out simultaneously.
Usually, each unit component is one floor high (or two or three floors high) and one compartment wide, and a yin and yang inlaid structure is used between the units, that is, the left and right mullions and the upper and lower horizontal frames of the unit components are in the same Adjacent unit components are inserted into each other to form a combined rod, thereby forming a meeting between the unit components.
The mullion of the unit assembly is directly fixed on the main structure, and the load it bears is directly transmitted to the main structure by the mullion of the unit assembly.
1. The processing and production of the curtain wall unit in the factory is easy to realize industrial production, reduce labor costs, and control the quality of the unit; a large number of processing and preparation work are completed in the factory, thereby shortening the construction period of the curtain wall on-site and the project construction period, bringing more benefits to the owner. Great economic and social benefits.
2. The yin and yang inlaid connection between the unit and the unit has a strong ability to adapt to the displacement of the main structure, and can effectively absorb earthquake action, temperature change, and inter-story displacement. The unitized curtain wall is more suitable for super high-rise buildings and pure steel structure high-rise buildings.
3. Use glue strips to seal the meeting place, and do not use weather-resistant glue (which is the current development trend of curtain wall technology at home and abroad), and is not affected by the weather on glue, and the construction period is easy to control.
4. Since the unitized curtain wall is mainly constructed and installed indoors, the adaptability of the main structure is poor, and it is not suitable for the main structure with shear walls and walls between windows.
5. Strict construction organization and management are required, and there are strict construction sequences during construction, which must be installed in the order of plugging. There are strict restrictions on the placement of construction machinery such as vertical transport equipment for main construction, otherwise the installation of the entire project will be affected.
Breathability
The air tightness tests measure the amount of air that passes through a closed window at a certain air pressure. The peak test pressure is determined by the specifier based on one of the categories in curtain wall air permeability, performance requirements, and classification.
The specifier must determine the level of air tightness required for the particular building. Higher test pressures can be specified if a more airtight building is required.
Waterproof
The water tightness test consists of applying a uniform spray of water under increased air pressure until water seeps into the window. The peak test pressure is to be determined by the specifier according to one of the categories in BS EN 12154:2000 Curtain walls, waterproofness, performance requirements and classification.
The specifier must determine the waterproofing rating of a particular building based on the degree of exposure to the weather. For example, in coastal areas, they may want to test higher peak pressures.
Wind resistance
Wind load is an indicator to measure the structural strength of the profile, and the test is carried out by increasing the air pressure to simulate the wind force. Performance requirements for the wind resistance of curtain walls are listed in BS EN 13116:2001 Curtain Walling, Resistance to Wind Load.
Due to the many different facade layouts and variations in curtain wall installations, it is impractical to structurally categorize the various curtain wall systems and specially designed structures.
Installation
Unitized curtain walls can be installed from inside the building using beams on the floor above, or from the outside using a crane. The installation team had to be securely connected to the structure by a wire harness.
Modules are transported to each floor, lifted into the correct position and installed on each floor. This involves hooking them on brackets that attach to the main base plate and leveling them with jacking bolts.
