Common material characteristics and selection points of curtain wall

Author: Hou

Aug. 22, 2022

Construction & Real Estate

(1) Aluminum

Aluminium is the most used metal structural material in the construction industry today after steel. The main projects using aluminum in the construction industry are aluminum doors and windows and curtain walls. Aluminum

Has good material properties, such as low density (2710kg/m3), suitable strength, good chemical stability, easy to keep clean, electrical conductivity

High, good radiation performance, suitable for anodizing, and easy to process.

Aluminum alloy profiles are widely used materials in glass curtain wall projects. They have better weather resistance, durability and decorative effect than steel, but their strength

And fire resistance is not as good as steel. The metal rods of the glass curtain wall are mainly aluminum alloy profiles. In order to improve the service life and prevent harmful factors from nature

Corrosion of gold materials requires surface treatment of aluminum alloy profiles, such as: exposed to outdoor - generally use fluorocarbon treatment, indoor side use powder spray

painted or anodized. The material must strictly comply with the relevant specifications, and the wall thickness shall not be less than 1.2mm.

Aluminum panels can be used for curtain wall materials, which can be divided into aluminum veneer, composite aluminum panels and honeycomb aluminum panels. The aluminum veneer curtain wall is made of high-quality high-strength aluminum alloy plate, which is often

The thickness is 1.5, 2.0, 2.5, 3.0mm, the model is 3003, and the state is H24. The maximum size of conventional material is 1220mmx 2440mm.

Aluminium panel wall structure is mainly composed of panels, reinforcing ribs and corner yards. The corner code can be directly bent and stamped from the panel, or the corner code can be riveted on the small side of the panel

forming. The reinforcing rib is connected with the electric welding screw behind the panel, making it a solid whole, which greatly enhances the strength and rigidity of the aluminum veneer curtain wall.

It ensures the flatness and wind and earthquake resistance in long-term use. If sound insulation and thermal insulation are required, efficient sound insulation and thermal insulation materials can be installed on the inside of the aluminum plate.

As a curtain wall material, the disadvantages of composite aluminum panels outweigh the advantages, and the most important thing is that it is poisonous. Strength and lifespan are better than single

The layered aluminum plate is poor and should be used with caution. The honeycomb aluminum plate is heavy in weight, high in cost and poor in sealing performance. It should be improved from the perspective of construction before it can develop. Compare

For the above-mentioned aluminum plate curtain wall materials, from the perspective of comprehensive performance, single-layer aluminum plate is the best material for aluminum plate curtain wall.

(2) Steel

Steel is widely used in curtain walls. Many curtain wall projects use steel structure as the main skeleton; most of the connecting components between the curtain wall and the building are made of steel.

The steel used in the curtain wall project is mainly carbon structural steel, which is a material with typical mechanical properties. Exposure of steel to atmospheric environment

It is very easy to rust, and usually take anti-rust measures such as hot-dip galvanizing on the surface.

There are many types of steel used for curtain wall, among which steel used for glass curtain wall includes section steel, light steel, galvanized steel sheet, high weather resistance steel sheet, painted steel sheet, etc.

Commonly used are carbon structural steel, alloy structural steel, weathering steel and stainless steel. In engineering design, designers choose and design materials, in order to

To avoid contact corrosion between dissimilar metals, isolation measures that must place insulating gaskets between two dissimilar metals are taken.

(3) Glass

The glass in the curtain wall project must use safety glass, which usually needs to be tempered. When choosing the thickness of the curtain wall glass, it should be based on the wind in the area where the building is located.

The specific conditions such as pressure, floor height and glass division are determined by structural calculation. At present, in order to achieve energy saving needs, more applications are low

Radiation coated glass, coated glass is to coat one or more layers of metal, alloy or metal compound films on the surface of the glass to change the optical properties of the glass

able to meet certain specific requirements. Coated glass can be divided into the following categories according to the different characteristics of the product: heat-reflective glass, low-emissivity glass (Low-E glass)

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E), conductive film glass, etc. The glass curtain wall is a non-combustible material. In the event of a fire, it can melt or soften, and only use a short period of time in a fire.

The glass will be broken over time, so the fire protection requirements of the building should be fully considered in the architectural design, and fireproof glass can be used for special requirements.

(4) Stone

Natural granite has the advantages of beautiful color, noble and elegant, high strength and good weather resistance, which has become the first choice for stone curtain wall. At the same time, the stone curtain wall also exists

Many disadvantages: Stone is bulky and easy to break, and there are many serious dangers in making the outer wall of high-rise buildings, especially many stone curtain wall projects are low-cost

Winning the bid, the contractor will cut corners in order not to lose money, which makes it difficult to guarantee the safety of the stone curtain wall. The quality of the stone is difficult to grasp,

There are also obvious differences in strength and color of stone mined at different locations and depths in the same mine. And the same stone also has differences in texture.

The fire resistance of stone curtain wall is very poor, and it is easy to crack and leak at high temperature. In high-rise buildings, disasters are generally ignited indoors, and a fire in the building will cause hanging

The temperature of the stainless steel plate and metal structure of the slate rises, which softens the steel and loses its strength.

Dangerous to pedestrians and difficult for firefighting.

Therefore, granite with uniform texture, no obvious difference in color and texture, and high strength should be selected. And rough for quality control should be strictly checked.

(5) Fasteners

In the connection of curtain wall components, in addition to the use of silicone sealant for the connection between the glass and the aluminum frame of the hidden frame curtain wall, mechanical connection is usually used, which is thick and thick.

Made of austenitic stainless steel. Including stainless steel bolts, screws, studs and nuts and blind rivets and other fasteners, the role of fasteners is to attach two

The above metal or non-metal components are connected together. In the actual project, it can be adopted according to the actual construction technology, construction conditions and design requirements.

Detachable connection or detachable connection, of which riveting is a non-detachable connection, suitable for places where local connection strength is not high and is not frequently disassembled.

The threaded connection is a detachable connection, and the connected components can be freely disassembled.

(6) Other materials for curtain wall

In the installation process of the curtain wall, in addition to the extensive use of aluminum alloy materials, steel materials, stainless steel materials and glass materials, some architectural

Sealing materials, structural sealants, filling materials, thermal insulation materials, etc. Because the panel materials of the curtain wall, such as glass, cannot be beaten during the installation.

Bending, welding, and some materials with high hardness and brittleness, and the curtain wall, as the protection of the building, not only bears its own weight, but also bears the wind load.

At the same time, the curtain wall is also required to have excellent rainwater leakage resistance, thermal insulation performance, etc.

and sound insulation performance. Therefore, it is necessary to use structural sealants to fix panel materials such as glass and make them have a reliable connection with aluminum frames, etc.

The curtain wall is sealed, which requires a good performance adhesive. The silicone structural adhesive is used to fix the glass on the aluminum frame when the structural glass is installed.

The adhesive material, the silicone structural adhesive, can transfer the load and other indirect effects of the glass panel to the supporting members such as the aluminum frame through the glue joint. silicone

The invention of structural adhesive makes the hidden frame curtain wall develop rapidly, which has a profound impact on the glass curtain wall. .

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