ã€China Aluminum Network】 The leakage of aluminum alloy doors and windows in construction projects is common and difficult to cure in the process of use. Over the years, it has become one of the more common defects in aluminum alloy doors and windows. With the large-scale development of China's civil housing, the monotonous areas of doors and windows have become larger and more walled, which has led to more and more obvious problems of rainwater leakage. This has a great impact on the quality of construction projects, resulting in more economic losses. Can not estimate. Therefore, it reminds us to strengthen the research on the waterproof of aluminum alloy doors and windows, form effective waterproof measures, and effectively improve product quality. The following analysis of several common causes of leakage of aluminum doors and windows and solutions.
First, aluminum alloy doors and windows main causes of water seepage analysis 1, aluminum alloy doors and windows in the design process itself is caused by defects in the structure. The main structural strength of doors and windows and the degree of rigidity have failed to meet the requirements of the local wind pressure performance indicators, such as small cross-sections and thin wall thicknesses, which result in the normal wind load of the aluminum alloy doors and windows by the stress members, hardware fittings, seals and bonding materials. Under the action of a serious plastic deformation, cracking or damage, etc., resulting in failure of the door and window body seal failure and rain leakage. The reason for this is that the product fails to accurately calculate and design the strength according to the specifications, and it has not passed the physical function test of the wind pressure before the factory installation and caused the door and window to leak water.
2. The design of the waterproof structure of aluminum alloy doors and windows is irrational. The level of the waterproof seal of the profile section is not enough and there are no multiple drainage channels. When rainwater enters the aluminum alloy door and window cavity and enters the room easily due to the difference of indoor and outdoor wind pressure, the rainwater entering the aluminum alloy door and window cavity can not be smoothly exhausted through the aluminum door and window drainage system and remain in the door and window. Causes water accumulation and leakage.
3, can not reach the quality requirements caused by processing and installation. Aluminum alloy doors and windows installed in the field, the assembly size control is not good, resulting in mutual overlapping position of the seal or lap joint size is insufficient; frame fan spell angle joints are not sealed, did not hit plastic; or due to pressure enough to have a gap, The fastening screws for fixing the door window frames are not sealed with glue, and the surfaces of the sealing parts are not cleaned when sealed with the sealant.
4, material and accessories caused by material differences. The use of aluminum alloy doors and windows sealant, plastic strips and hardware accessories and other auxiliary material quality is not qualified. If the sealant is used out of date or counterfeit, the anti-deformation capacity is poor and it is easy to crack; the rubber strip is too hard, the anti-aging time is short, and the shrinkage is easy to pull off; the quality of the hardware accessories is too bad to withstand multiple opening breaks or Deformation caused by lax close, leading to water seepage phenomenon.
5. The improper sealing and sealing of the joints between the outer frame of the aluminum alloy door and window frame and the wall of the cavern, and the gap between the wall of the cavern and the wall of the cavern are too large or too small, which makes it difficult to fix the door and window, and it is not easy to produce cracks. This is often caused by civil works. . It is also one of the causes of seepage.
Second, for the above reasons to take the waterproof approach 1, design and preparation stage. First of all, strict calculation and design shall be conducted according to the characteristics of the project in accordance with the specifications. The wall thickness and section of the aluminum profile shall meet the local building's wind load size and use requirements. In front of the door and window frame wall, select the overall window with unfavorable wind pressure or large batch size to perform the three-character detection. According to the actual physical performance test, determine whether the door and window meet the design requirements and performance indicators.
2, door and window structure waterproof design.
(1) The aluminum alloy door and window structure design actively adopts equal pressure principle, which is an effective way to improve the waterproof sealing performance of doors and windows.
(2) The amount of overlap between the movable fan and the window frame must not be too small. The amount of lap joints between the swing window and the window frame should not be less than 6mm.
(3) High-rise buildings, cold areas, and areas with high energy-saving requirements should adopt flat-open door and window structures as much as possible, with little or no push-pull door and window structure. Because there is a large gap between the push-pull type door and window movable fan and the upper descending rail, and the adjacent two window fans are not on the same plane, there is no seal pressing force between the two sashes, and only the top bar is used for overlap and overlap. There is a gap between the tops and the sealing effect is very weak, so the waterproof sealing performance of sliding doors and windows is poor. The flat door and window sash and the window frame are provided with 2 to 3 sealing rubber strip seals. After the sash is closed and locked, the sealing rubber strip is pressed tightly, and an equal pressure chamber is easily formed in the middle cavity. Designed doors and windows with superior sealing performance.
(4) Aluminium alloy glass pressure wires for glass doors and windows should be designed in the indoor direction to avoid seepage of fine gaps between glass pressure lines and window frames.
(5) Push-pull type doors and windows should be designed with a sufficiently high water deflector on the interior side of the slide. Otherwise, when there is a certain amount of rain on the outdoor rainwater, rainwater will flow into the room through the baffle.
(6) The upper part of the door and window movement fan shall be provided with a drip plate, and the lower part shall be provided with a drainage hole with sufficient displacement so that the water entering the door and window can be smoothly discharged to the outside.
(7) Assemble doors and windows to minimize exposed seams, as fine gaps cannot be leaked with sealant seals. When the joints cannot be avoided due to structural reasons, the two contact surfaces of the joints form a 90[deg.], which facilitates the sealing of the sealant.
3, doors and windows cutting, assembly to improve the production of fine degree, to ensure that the appropriate amount of overlap, but also need to pay special attention to the embedded glass when the fan and the fan and the fan and the surrounding box at the sealing joints.
4, materials and accessories material selection. The selected weatherproof silicone sealant, wall glue, and sealant on the frame fan spell corner seam; select the regular manufacturers of hardware accessories.
5, aluminum alloy doors and windows around the hole and the wall of the junction, to ensure that the gap size meets the requirements, to facilitate the seal between the two, and filled with waterproof material packing seal.
Conclusion In summary, the water seepage problem of aluminum alloy doors and windows may be related to design, installation, processing, and civil engineering units. As long as we strengthen the study and summary of water seepage problems, take effective measures, and strengthen the monitoring of the quality of water seepage. Must be able to build high-quality aluminum alloy doors and windows with minimal water leakage.
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