[China Glass Net] The glass curtain wall combines the functions of wind protection, rain protection, lighting, heat insulation and other functions of building exterior protection with the exterior decoration of the building to form a building envelope with integrated construction technology and architectural art. It has been widely used in high-rise buildings and super high-rise buildings in China. However, due to the special nature of the glass curtain wall structure, involving a variety of materials and high technical requirements, it is necessary to have correct design calculations, standardized process flow, and supporting processing equipment and high-quality construction team, so the glass curtain wall The mastery of the quality control points in the whole process of the project is more important. This paper briefly describes several points of the all-round quality control of the glass curtain wall project.
Quality control of the design:
The design of the curtain wall should be fully understood by the production, installation, supervision and other personnel without any explanation. Therefore, the drawings should be complete and detailed, and the expression should be standardized. At present, the glass curtain wall project is mostly designed by the construction enterprise. The drawings have not been reviewed by the original structural design unit. Although some have been reviewed, they have only been roughly reviewed from the overall scheme and the façade effect, and have not played a role in technical review. Therefore, the design drawings are extremely non-standard, and there are widespread phenomena that the design drawings are not deep enough and the design drawings are incomplete: no construction drawings and construction requirements, lack of large-scale image of nodes, lack of calculation of anchor nodes for embedded parts, vertical load of curtain wall keel frames Calculation of stress and deformation under horizontal load; improper lightning protection, fire prevention and drainage measures, no design determination of the distribution of the lightning protection grounding system of the curtain wall, the material and section size of the lead wire and the lightning protection system of the main structure, and It is clearly marked on the design drawing and the large sample drawing, and the connecting body of the curtain wall and the main structure is directly connected as the lightning protection grounding; the position of the embedded part is not marked in the design drawing, and the three-dimensional adjustment processing is ignored. In addition, the design of the glass curtain wall of some projects lags behind the progress of the main project, and there are no embedded parts in the structure, so that the connection between the glass curtain wall and the main structure is improper, which affects the reliable connection. Some of the outer edges of the project floor have no physical window under the wall, but the anti-collision railings are not provided as required, all of which leave different degrees of quality and safety hazards to the glass curtain wall.
Quality control of materials:
The profile of the curtain wall shall comply with the high precision requirements specified in the current national standard "Aluminum Alloy Building Profiles" GB/T5237. The thickness of the anodized film shall not be lower than the AA15 specified in GB8013 of the General Specification for Aluminium and Aluminum Alloy Anodized Films. The wall thickness of the structural part profile is not less than 3mm. The structural adhesive should have good tensile strength, peel strength, tear strength and elastic modulus, and it also acts as a shock absorber. Structural silicone sealants and weather-resistant silicone sealants must have a quality certificate for the product quality guarantee period provided by the material supplier and a test report on the compatibility and adhesion of the structural silicone sealant to the contact material, and should pay attention to the same Whether the quality of the structural adhesive of the batch is stable, the structural silicone rubber exceeding the expiration date shall not be used; the weathering adhesive and the structural adhesive shall not be used interchangeably. In particular, the structural adhesive shall not be used as the weather resistant adhesive; the hardware shall meet the design requirements and shall not be easily rusted. For stainless steel materials, the stainless steel should be shielded from welding to prevent the welding spark from splashing onto the stainless steel to cause rust; the material with fire rating A or B1 should be used strictly according to the specifications. When the fire rating of the material is not clear, it should be sampled for testing. .
Quality control of construction:
The construction quality control of the glass curtain wall project mainly lies in two aspects: one is the installation and installation of the pre-embedded joints; the second is the fabrication and installation of the components. Specifically, it can be controlled from the following aspects:
The curtain wall is connected with the main body. When there is no condition to connect the embedded parts, other reliable connection measures are adopted, but the bearing capacity must be determined by the joint strength test. The test items and bearing capacity should be determined by the design. The embedded parts and connecting parts must be installed firmly and in the correct position. The quality of the welded joints meets the requirements of JGJ81-91 of the Welding Rules for Building Steel Structures and is treated with anti-corrosion treatment.
The curtain wall connector should have a three-dimensional adjustment margin, the adjustable range is 40mm, and there are anti-loose measures. The force of the rivets and bolts must be no less than two.
Custom Terry Cloth Fabric,Terry Fabric,Stripe Cotton Fabric,Polyester Cotton Terry Fabric
Zhejiang Tangber Trade Co .,Ltd , https://www.tangber.com