Technical specification for glass curtain wall
1. Steel: The surface of steel needs to be galvanized or coated with inorganic zinc-rich coating.
2. Aluminum alloy: surface anodizing, electrophoretic coating, powder spraying and fluorocarbon spraying.
3, hidden frame, semi-hidden frame glass curtain wall, glass and aluminum bonding must use neutral structure silicone sealants, all-glass curtain wall and point-supported curtain wall coated glass, acid silicone structural sealant shall not be used.
4. Threading aluminum profile insulation material: polyamide+glass fiber casting aluminum profile insulation material: polyurethane.
5. The stainless steel of glass curtain wall should be austenitic stainless steel, and the nickel content should not be less than 8%.
6. Insulating glass of glass curtain wall: When the gas layer thickness is ≥9mm, double-pass sealing shall be adopted, one with butyl hot-melt sealant and the other with silicone sealants.
7. Glass curtain wall laminated glass: the clip should be made of polyvinyl butyral film.
8. Rubber products for glass curtain wall should be EPDM, neoprene and silicone rubber.
9, curtain wall opening fan angle should not be greater than 30 degrees, opening distance should not be greater than 300mm, when the height is more than 40 meters, cleaning equipment should be set.
10, when heating, ventilation and air conditioning are required, the air tightness of the glass curtain wall should not be lower than Grade 3.
1 1, the glass curtain wall should adopt curtain wall glass with reflectivity not greater than 0.3, and the lighting reduction factor of glass curtain wall with lighting requirements should not be less than 0.2.
Key design points of modular concealed frame glass curtain wall
1. Regarding the connection between glass curtain wall columns and beams, Article 6.3. 1 1 in Technical Specifications for Glass Curtain Wall Engineering actually means that this can be done under certain conditions, which is a selective meaning, because aluminum profiles are basically selected for normal glass curtain wall columns and beams.
However, at present, the building curtain wall industry is developing rapidly, and many investment units of construction and development hope to save the building assembly and push it to the market to maximize the benefits. Therefore, there are many commercial buildings with high floors, and the cost of choosing aluminum alloy profiles to complete the investment in building curtain wall is relatively high, so many buildings use carbon structural steel profiles to realize the design and construction of curtain wall products.
2. Regarding the installation of the hidden frame glass plate, considering that the installation of the plate meets the requirements of the actual construction period and the safety requirements after the plate is installed, the plate needs to be bonded with the aluminum alloy auxiliary frame in advance in the factory, so it cannot be ignored because the aluminum alloy auxiliary frame bears a certain burden of safely bearing the glass load.
At present, there are two forms of aluminum alloy glass subframe: closed cavity and open type. All templates with closed cavities are designed with special matching aluminum alloy corner codes, which is convenient for matching and assembling when producing sub-frames. The open aluminum alloy subframe does not need to be designed with special supporting aluminum alloy corner codes, and it can be properly designed to meet the stress requirements, but no matter which one is chosen, the glass aluminum alloy subframe should be combined into a closed aluminum alloy stress frame during production.
3. Regarding the construction and installation of glass, the first thing is to protect the glass products, and the second is to pay attention to the installation quality. Only by protecting the glass sent to the construction site from other external damages can we further ensure that the cost of good materials does not exceed the planned cost, so the glass cannot be placed in the construction area at will.
The installation quality of glass is a key process management problem. Once the management is not in place and the supervision is lax, unnecessary security problems will occur. In the whole process of construction and installation, first of all, it must be strictly required to operate in accordance with relevant specifications and construction drawings. The materials used must be consistent with the drawings and cannot be changed and operated at will because of simplicity.
What should be paid attention to in the construction of glass curtain wall?
First, when designing, the drawings should be clear enough and marked in detail, so as to ensure that other builders can understand what your building requirements are, that is, to convey your ideas clearly.
Second, the selection of materials should meet the prescribed standards. The material selection of glass curtain wall should pay special attention to the requirements of high precision grade specified in GB/T5237, the national standard "Aluminum Alloy Building Profile". Materials with higher fire resistance should be used in strict accordance with the specifications, preferably Grade A or Grade B 1. If the fire resistance grade of the material is not clear, sampling test must be carried out.
Thirdly, when designing the glass curtain wall, it is very important to prevent rainwater from leaking to the outside. It is best to design drain holes and drain pipes for condensate water. It is best to prevent outdoor water from entering, and the indoor drainage system should be unobstructed.
Fourthly, what needs to be tested is the wind pressure deformation performance, rain water leakage performance, air permeability performance and displacement performance of the glass curtain wall.
Five, when installation must pay attention to the verticality and flatness of the glass plate. When processing glass plates, attention should be paid to the thickness of glue injection and the flatness of pasting frames to avoid stress when structural glue is cured. In order to prevent image distortion caused by uneven plane, attention should be paid to the verticality and flatness of glass plate during installation.
Six, attention should be paid to the connection between curtain wall components and the main structure, joint treatment around curtain wall and structure, lightning protection and grounding joints, curtain wall expansion joints including upper and lower seals and corner joints, column joints, beam-column joints, frame joints, fire insulation facilities, internal drainage joints, etc.
The above is a complete introduction to the design specifications and design considerations of glass curtain wall. I hope the above introduction can help you. This kind of glass curtain wall design needs professionals to know very well. If you are interested, you can learn more about relevant design knowledge!
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