[China Glass Net] The problem of water seepage in the glass curtain wall in the northeast region has seriously affected the function and life of the building, and reduced the safety and durability of the building. The reason for the water seepage of the glass curtain wall is very complicated, involving various aspects such as design, material use, construction and management. Xiaobian shares the method of solving the water seepage of the curtain wall. 1. Analysis of the causes of water seepage in glass curtain wall 1.1, aluminum profile 1 aluminum profile surface treatment does not meet the national standards, the surface coating adhesion is not strong, the oxidation mold is too thin or too thick, resulting in sealant bonding failure. 2 The main members of the aluminum members are insufficient in strength and rigidity, and the wall thickness of the section subjected to the force is less than 3 mm. Under the load standard value, the relative deflection is greater than L/180 or the deflection is greater than 20 mm, and the curtain wall is severely deformed. Displacement and rain leaks. 3There is no high-precision grade aluminum material, especially the curtain wall column should adopt ultra-high precision grade. The aluminum profile is unqualified, and its bending, twisting, and wavy are seriously exceeded, resulting in the flatness and verticality of the entire curtain wall not meeting the requirements. 1.2, sealant 1 in order to save costs, the use of ordinary sealant without the use of weather-resistant silicone sealant for outdoor caulking, after ultraviolet radiation by the sun, the glue seam premature aging, causing cracking. 2 Use expired structural silicone sealant, weather-resistant silicone sealant, wall edge glue, foaming, cracking or non-solidification, resulting in water seepage on the curtain wall. 3 The structural silicone rubber sealant contact material compatibility test was not carried out according to the specifications. As a result, the structural silicone sealant is incompatible with aluminum profiles, glass, rubber strips, etc., and chemical changes affecting the adhesion occur, and at the same time affect the sealing effect. . 1.3, glass 1 glass strength is not checked, the glass does not have enough bearing capacity, cracking and breaking under the typhoon rain, leading to water. 2 Glass is not used for thermal stress verification. Large areas of glass absorb sunlight, thermal stress exceeds its allowable stress, causing thermal fracture and leakage of curtain wall. 3 The dimensional tolerance of the glass exceeds the standard. The embedding amount and gap on both sides of the glass do not meet the requirements. When the glass is mounted on the glass frame wall of the bright frame, the glass is too small, the depth of the notch is insufficient, the width of the glue is not up to the requirement, and the glass is easily broken from the edge. If the glass is too large, the slot is embedded too deep, and the glass is easily expanded by the aluminum profile due to thermal expansion. When the glass with inaccurate size is installed on the hidden frame glass curtain wall, the width of the glue seam is not uniform, and it is difficult to control the quality of the glue injection. According to the specification, the width of the glass joint wall of the hidden frame glass curtain wall should not be less than 15mm, so as to ensure that the seam clearance meets the curtain wall. Earthquakes and temperature changes create inter-layer displacement requirements without squeezing the glass. 4The glass is not subjected to edge chamfering and chamfering treatment. When used as a curtain wall material, the glass is prone to stress concentration, resulting in cracking or self-explosion, and there are hidden dangers. 1.4. Construction 1 When the aluminum frame is installed, it does not operate according to the specifications. The quality is not grasped. The horizontality, verticality, diagonal difference and straightness exceed the standard, which directly affects the physical properties of the curtain wall. 2 The weather-resistant silicone sealant is not compact, the sealing is not strict or the length or width ratio does not meet the specifications. 3 does not pay attention to the construction conditions of the sealant. There are many rains in the south. For example, in the rainy season, the weather-resistant sealant is forcibly constructed in the open air, and the sealing quality cannot be guaranteed. Structural rubber construction also has certain temperature and humidity conditions, which must be noted. 4The size of the sealing strip does not match or adopts inferior material, so it is loose or aging quickly, and the sealing and waterproof function is lost. 5 The elastic positioning pad is not used, and the glass is in direct contact with the member. When the building is deformed or the temperature changes, the component generates a large stress on the glass, often starting to crack the glass from the bottom of the curtain wall. 1.5. Use 1 does not provide detailed completion data and instructions for use to the user. After the user stays, the user does not understand the use of the curtain wall, causing damage to the curtain wall, collision deformation, pollution, etc., resulting in water seepage. 2 When the outer wall is cleaned, improper operation may cause damage to the curtain wall. 3 The households carried out renovations without authorization, and the damaged parts were not carefully filled and waterproofed. 2. Curtain wall seepage prevention measures There are three basic conditions that cause water seepage and water leakage in the curtain wall: there are pores; there is water; there is a pressure difference with water seepage cracks. Eliminating one or more of these basic conditions is a way to prevent water leakage: one is to minimize the pores; the other is to block the rainwater so as not to wet the gap; the third is to reduce the wind pressure difference at the wetted gap. 1In the curtain wall aluminum profile, a small hole flowing to the outside is opened, and the water entering the curtain wall through the small gap is collected and discharged outside the curtain wall, and a small amount of water in the isobaric chamber between the glass, the aluminum profile and the aluminum buckle is discharged. 2 When designing, it is also conceivable to set up collecting pipes and drainage pipes on the glass curtain wall, collect the water that has penetrated into the crack walls into the curtain wall, and smoothly discharge them to a designated drainage hole in the room through the drainage pipe. 3 Use high-quality structural silicone sealant, weather-resistant silicone sealant, wall edge glue, and strengthen inspection to prevent overdue use. The choice of high-quality float glass, the glass must be treated by the edge, the size error of the glass meets the standard requirements. 4 Pay attention to controlling the use environment of the sealant. It is strictly forbidden to carry out the construction of weather-resistant silicone sealant in the open air on rainy days. The indoor temperature should not be higher than 27 °C, and the relative humidity should not be lower than 50%. Remove dust, grease, loose objects and other dirt from the aluminum frame, glass or gap before applying the glue. After injection, it should be embedded and compacted, the surface should be flat, and the maintenance should be strengthened to prevent hand mold and water flushing. 5 According to the requirements of the specification, the rain curtain leakage performance inspection should be carried out in layers during the construction of the glass curtain wall in order to repair and control the quality of the curtain wall. 6 The quality inspection of glass curtain wall is divided into two types: concealed acceptance and engineering acceptance. Concealed acceptance is carried out after the installation of aluminum profile frame. It mainly checks the firmness of the connection steel code, and checks the installation of the gap node with the main structure of the curtain wall, installation of expansion joints, etc. . The project acceptance is carried out after the completion of the glass curtain wall project. Casket Lining Fabrics and Liners Sewing
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March 25, 2023