A Brief Talk on the Development of Curtain Wall Construction and Leakage Factors

As early as 150 years ago (the middle of the 19th century), due to the limitations of data and processing technology, the curtain wall could not achieve absolute water tightness, air tightness, resistance to various natural external forces (such as wind, earthquake, air temperature), and thermophysical factors ( Heat radiation, condensation), sound insulation, fire prevention and other requirements, therefore, indoor curtain walls are used in construction projects. Since the 1950s, due to the rapid development of construction data and processing technology, the development of various construction data, such as the invention of various sealants and the introduction of other sound insulation and fireproof filling data, has solved the construction indicators around the curtain wall. It has gradually become a new trend of contemporary exterior wall architectural decoration. Nowadays, curtain walls are not only widely used in the exterior walls of various structures, but also widely used in various functions such as communication rooms, television studios, airports (airports), large stations, stadiums, museums, cultural centers, hotels, shopping malls, etc. In the construction of the interior wall, the curtain wall is composed of a supporting structure system and panels, which has a certain displacement capacity compared with the main structure, and does not share the external protective structure or decorative structure of the main structure. In the future, due to the combination of curtain wall technology and science and technology, in order to respond to the global order of energy conservation and emission reduction, smart curtain walls, such as solar photovoltaic curtain walls, ventilation channel breathing curtain walls, wind and rain induction smart curtain walls, will show the strange charm of architecture. There should be three factors for rain leakage curtain wall: gap, water pressure and wind pressure: The first point: the poor quality of the weather sealant for curtain wall injection, causing the gel to crack, pores, and water leakage. It is important not to inject the glue according to the glue process, such as the glue injection part is not clean, the glue seam depth is too large, the filling data depth is different, the thickness does not meet the requirements, and the glue injection in the seam is not dense and uneven. Separately leak and seal. The quality of the weather-resistant sealant is also one of the reasons for the leakage of adhesive joints. The second point: The closed parts such as edge sealing and top sealing do not meet the requirements. The building curtain wall is composed of a supporting structure system and panels. Compared with the main structure, it has a certain displacement ability and is not shared with the external protection structure or decoration structure of the main structure. If the closing plate is in direct contact with the main cement mortar, it will cause corruption and fail to achieve the proper sealing effect. The water must be turned back. Point 3: Analysis of the reasons for open window leakage and water leakage 1. When the window frame and the fan frame device are not matched or adjusted incorrectly, the machining size error of the parts is large. After assembly, there is a large gap between the frame and the fan. The seal is not tight. Second, the quality of the sealing tape is unqualified, the material feels poor, the elasticity is not good, and the aging resistance is not good. The specifications and models of the tape do not meet the requirements of the drawings, and there is no sealing effect. 3. The quality of hardware accessories such as sliding supports and handles is poor. Some accessories have large deviations in the position of the device, the length of the sealing strip is not enough, or the welding of the rubber strip is not strong when the rubber strip is overlapped, and the rubber strip is tightened after the installation, resulting in partial sealing failure . The design did not consider the detailed waterproof structure of the fan frame, and rainwater directly enters the waterproof rubber strip, such as drip eaves, bleeding holes and other detailed designs. Individual details are not handled properly, such as the exposed screw holes of the frame fan and the larger splicing gaps that are not sealed, which becomes a leaky channel.