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Analysis on the design of waterproof system for thermal insulation aluminum alloy doors and windows
Editor: liefan, December 11, 2019 18:00:01

1、 Preface
Broken bridge aluminum doors and windows, also known as aluminum plastic composite doors and windows, adopt heat insulation bridge broken aluminum profile and insulating glass, usually three cavity structure, with energy saving, sound insulation, noise prevention, dust-proof, waterproof and other functions. Compared with plastic steel windows, the outstanding advantages of thermal insulation bridge broken aluminum alloy doors and windows are high strength, good steel, good fire resistance, large lighting area, good atmospheric corrosion resistance, long service life, good thermal insulation and decoration effect. Because of its high comprehensive performance. It is widely used in modern architecture.
At present, the aluminum doors and windows of bridge break can not be assembled by seamless welding technology like plastic steel windows. Nowadays, it is mainly mechanical assembly. If it is not handled properly, water seepage will easily occur in practical engineering. The main reason is that the design of the profile drainage system is not reasonable, and the installation and construction are not done in place. When the rainwater penetrates into the profile cavity through the gap between the sealant strip and the glass, it can not be discharged in time, resulting in water accumulation. Over time, the rainwater will penetrate into the wall through the assembly gap of the profile, thus damaging the interior decoration effect. Therefore, when making the design of heat-resistant aluminum alloy doors and windows, we must design the drainage system to avoid the possibility of ponding and water seepage.

2、 Waterproofing design of aluminum alloy doors and windows with broken bridge
The design principle of waterproof system for thermal insulation aluminum alloy doors and windows is very simple, that is, the principle of pressure balance. As long as we apply this principle of thinking,
If a set of drainage channel is designed well, the possibility of rainwater ponding can be solved by structural technology, so as to avoid the occurrence of rainwater leakage.

There are three elements for rain leakage of doors and windows
A. there should be gaps on the outer surface of doors and windows or in the cavity;
B. there should be water around the gap;
C. It can make water enter the interior of doors and windows through gaps. There are usually gravity, kinetic energy, surface tension, air flow, pressure difference, etc.
If one of the three elements is missing, leakage will not occur (if the effect of these three elements is reduced to the minimum, the leakage can be minimized). In the outer wall, water and crevice can not be eliminated, only in the role of efforts, through the elimination of water does not pass through the gap into the inner chamber, flow into the room.
The so-called pressure balance is to eliminate the pressure difference on both sides of the opening, so that the pressure on both sides of the opening is balanced. In the application of this principle, the main factor is that there is a cavity inside the joint, and the pressure on the inner side of the outer surface must be kept equal to the outdoor air pressure at all parts, so that both sides of the outer surface are in the state of equal pressure. Pressure balance is achieved by deliberately making the opening in the open state, so that the cavity and outdoor air circulation, in order to achieve pressure balance.
Bridge broken aluminum profiles are usually three cavity structure. The principle of pressure balance is to keep the internal pressure of the outer chamber balanced with the external atmospheric pressure. When some water enters the outer cavity through the gap of the outer surface, due to the balance of the internal and external pressure, the water can be discharged out of the room through the drainage outlet under its own gravity.

The main points are as follows:
1. The surface of the window should be able to prevent a large amount of rainwater from entering the inner cavity of the profile. Generally, the sealing part of the glass and the window sash should be sealed with a good elastic rubber strip, and the overlapping part of the window sash and window frame should be set with water blocking;
2. Due to the inevitable water and gap, when the external wind pressure is large, which will produce pressure on the glass, the gap between the glass and the window sash is easy to seep. Therefore, the outer cavity of the profile should be provided with a water collecting tank, which should have a certain capacity to hold water;

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