Definition of glass curtain wall
Definition: A glass curtain wall composed of panels and glass ribs or point support devices and support structures is an all-glass curtain wall.
Features: 1, transparent effect, which can make indoor space and outdoor environment naturally harmonious.
2. Exquisite parts and beautiful structure, which realize the perfect combination of exquisite metal structure and glass decoration art. ..
3. Various supporting structures can meet the needs of different building structures and decorative effects.
4. The glass is connected with the connecting claw through the ball hinge, which has strong deformation absorption ability.
Function of glass curtain wall
The glass curtain wall of modern high-rise buildings adopts mirror glass and ordinary glass, and the interlayer is filled with dry air or inert gas. There are two layers and three layers of insulating glass, and the two layers of insulating glass are sealed by two layers of glass and a frame to form a sandwich space; Triple glazing is two sandwich spaces composed of triple glazing. Insulating glass has the advantages of sound insulation, heat insulation, frost resistance, moisture resistance and strong wind pressure resistance. According to the measurement, when the outdoor temperature is-10℃, the temperature in front of single-layer glass window is -2℃, while the indoor temperature with three-layer insulating glass is 13℃. In hot summer, double-layer insulating glass can block 90% of solar radiation heat. Sunlight can still pass through the glass curtain wall, but most of it won't feel hot in the sun. The room with hollow glass curtain wall can be warm in winter and cool in summer, which greatly improves the living environment.
Construction technology of glass curtain wall
Installation sequence of glass curtain wall: construction preparation → measuring and setting out → installation and treatment of embedded parts → installation of connecting angle codes → installation of columns → installation of beams → fabrication and installation of structural glass assembly components → weatherproof silicone sealants caulking → cleaning and inspection → completion acceptance.
Selection points of glass curtain wall
1, depending on the design requirements
1), the drawings should be complete and detailed, and the expression should be standardized. Description of construction drawings and construction requirements, details of nodes, calculation of anchor nodes of embedded parts, calculation of stress and deformation of curtain wall keel frame under vertical and horizontal loads, and lightning protection, fire prevention, waterproof and drainage measures must be complete.
2) Curtain wall design should take measures to prevent rainwater leakage. The cross-section form of glass curtain wall columns and beams should be designed according to the principle of equal pressure. Drains should be set at the parts prone to leakage, and condensate drain pipes should be set at the parts prone to condensate. When making components, drain pipes should be drilled in strict accordance with the specified requirements, and neoprene or silicone rubber products should be used as sealing materials at the opening.
3) Contact points of different metal materials of glass curtain wall shall be provided with insulating gaskets (general thickness lmm) or other anti-corrosion measures. The size of the insulating sheet should not be less than the contact area, so as to ensure the direct contact between aluminum alloy columns and different steel connectors. The contact point between column and beam should be provided with flexible gasket.
2. Material selection.
1), the profile for curtain wall shall meet the high-precision requirements specified in the current national standard "Aluminum Alloy Building Profile" GB/T5237, and the thickness of anodic oxide film shall not be lower than AA 15 specified in "General Specification for Anodic Oxide Film of Aluminum and Aluminum Alloy", and its index is: the wall thickness of structural profile shall not be less than 3mm. The minimum average film thickness is 15дm, and the minimum local film thickness is12 д m. The surface color of anodized aluminum alloy profiles is basically uniform, and there are no defects such as corrosion spots, electric welding injuries, black spots and oxide film peeling.
2) Frame-supported glass curtain wall should adopt safety glass. For the point-supported glass curtain wall supported by glass ribs, the glass ribs shall be tempered laminated glass. Safety glass should be used in public places with high flow density, places where teenagers or children are active and vulnerable to impact during use.
3. Physical performance test
The physical performance test of building curtain wall refers to the test of many physical performance indexes such as wind pressure deformation performance, rainwater leakage performance, air permeability performance and horizontal displacement performance of curtain wall. Unit curtain wall and multi-span continuous beam curtain wall should be tested with more than two layers of representative parts. Structural adhesive, weather-resistant adhesive and other materials used in curtain wall shall be tested synchronously according to regulations before use, and shall be carried out before curtain wall components are installed. Through inspection, we can find the defects in design, manufacture and installation, confirm the correctness of design and material selection, and whether the design function of curtain wall conforms to the actual situation.
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