Walking on the roads of the city, the towering stone curtain wall buildings on both sides make the city's taste more high-end. Its rich colors give the building a more lively coat. However, due to the influence of urban air, many buildings have not been accepted. In two or three years, the curtain wall is extremely old, and the more plaguing the stone curtain wall is the ubiquitous pollution. If the dust can be removed by self-cleaning, the pollution is more of a deep human bone marrow. The destruction made the stone curtain wall look low and low, which made the whole building look less beautiful. The generation of stone pollution is not a one-off event. However, it is often doomed at the design and construction stage. Unreasonable design schemes and barbaric construction methods are the sources of pollution. The following is a summary of the pollution situation that has occurred in recent years. The causes of each link are analyzed. 1. Wrong drainage direction In the same building, some are particularly serious in pollution, while some locations are not so obvious. This problem is worth pondering. Under the same material conditions, the serious pollution position must be that the drainage direction is not effectively controlled during design. The inclined surface of the water flow is formed at part of the position, and part of the position is properly drained. The same façade of the same stone, the stone on the left side of the high position is almost as clean as new, while the stone below the railing on the right side is more polluted. In this regard, we studied the node design of the project and found that the top cover of the parapet area of ​​the high platform is designed with an inward 3% drainage slope, so that the top water is discharged inward, and the lower part is provided with a glass railing, so it is used outward. The free drainage method, because the water flows to drive part of the top part of the dust, dust adheres to the surface of the stone, forming a water mark. As a result, the stone on the right side is more polluted than the left side. This phenomenon can be defined as “water pollution†and is a neglected part of the research on the pollution of stone curtain wall. 2. Unreasonable drain design As a functional existence, the drain pipes of many buildings are often exposed on the outer surface of the building, and some high-end villas often set the drain pipe within the stone curtain wall in order to pursue the façade integrity, which of course can add a lot to the appearance. However, contrary to the principle of “formal obedience functionâ€, it is difficult to check the first time when there is water seepage from the drain pipe, and it is often found until the water seeps into the stone panel. Due to the concealed design of the drain pipe, it is difficult to overhaul. It is necessary to dismantle the stone to achieve it. The stone curtain wall itself is also secondary damage. Moreover, the strength and appearance of the stone itself washed by the sewage for a long time are seriously affected. 3, inappropriate face material selection In the selection of the panel of stone curtain wall, it is necessary to strictly divide the boundary between indoor and outdoor. Many stone materials are only suitable for indoor use, such as marble. Due to its durability, corrosion resistance and weathering resistance, it is impossible to change naturally in the outdoor. In the long-term use of the environment, for sandstone, only the water absorption rate and strength of the specification are required. In fact, sandstone needs to consider its self-cleaning ability in addition to its safety. Sandstone has a lot of porosity on the surface. These holes provide space for the growth of mold. Usually, some sandstone-decorated stone curtain walls often have hard-to-clean black spots on the surface. Some low-rise buildings and even green moss on the surface will be cleaned. Brought a great deal of interference. After selecting the appropriate stone panel, it is necessary to protect the six sides of the line to avoid external contamination. 4, incorrect insulation material installation When the stone curtain wall is installed, it is often accompanied by the filling of the thermal insulation material. Generally, the thermal insulation cotton is used. When the thermal insulation cotton is transported to the site, the outer surface thereof is covered with a layer of aluminum foil to protect the moisture and keep the insulation cotton dry. However, the staff of many construction units do not understand the purpose, simply think that it is just packaging, tearing it apart during the construction process. Once the rainy season occurs, the insulation cotton will absorb the water and increase its own weight. It will collapse from the original structure, and eventually all the insulation cotton will sink. The bottom insulation cotton will accumulate and the top insulation cotton will be displaced, which will not effectively maintain the insulation. The effect of energy saving. What is more serious is that the insulation cotton absorbs water and hangs down, resulting in the accumulation of waste cotton with high water absorption at the bottom. It is close to the stone panel and the connecting piece, which not only easily oxidizes the metal joints, but also causes the moisture of the water from the stone. The holes ooze out to form uneven water spots, which are extremely unsightly from the façade. 5, unqualified transfer pendant The structure of the curtain wall needs to be connected by stainless steel or aluminum alloy. Due to cost considerations, stainless steel is used more widely. Some construction companies have cut corners and reduced the amount of stainless steel. It has little effect at the beginning of the building, but with the The age of the investment is increased, the galvanized layer on the metal surface is worn, and iron oxide is formed under the oxidation of moisture, and the rust is easily infiltrated through the joint portion, thereby causing rust marks on the stone panel. Therefore, in the selection of stone curtain wall connectors, it is not recommended to choose 530408-06Cr19Ni10 stainless steel, the material has general anti-rust performance, more suitable for interior decoration, it is recommended to use 531608-06Cr17Ni12Mo2 stainless steel and 531603-022Cr17Ni12Mo2 stainless steel, good anti-rust performance, on stone Less pollution. 6, unqualified stone sealant Stone sealant has the greatest impact on the pollution of the panel. Due to the nature of the material, the erosion of the stone is consistently penetrated from the edge of the stone into the interior of the stone, so it can not be effectively treated by mechanical cleaning, physical cleaning or chemical cleaning. Cleaning, so the choice of sealant should be carefully selected. During the construction process, the sealant used in the stone curtain wall must be subjected to oil leakage test. Only use non-polluting sealants. Inferior glue mixed with white oil (mineral oil) shall not be used for the filling of stone curtain wall, avoiding the infiltration of oily material into the edge of the stone, forming a special pollution shape with the glue joint as the center and spreading to both sides. Stone is a microporous material that penetrates deep into the stone if it is contaminated by the outside world. Oil pollution is the most common and most serious pollution. Once it appears in the stone curtain wall, it cannot be cleaned. It can only be removed and replaced. Concerned about surprises Label: Six reasons for the pollution of stone curtain wall Previous: Summer decoration often makes 8 kinds of mistakes, rainy days do not paint paint Next: The most water-saving installation skills basin faucet to be installed 1, Used as W/O or O/W type emulsifying agent, defoamer, oil emulsifier, PVC granules additives, etc., also can be used as laundry detergent. Nonylphenol Ethoxylate,Surfactant Nonylphenol Ethoxylate,Washing Agent Nonylphenol Ethoxylates,Nonyl Phenol Ethoxylates NINGBO LUCKY CHEMICAL INDUSTRY CO. LTD , https://www.chinaluckychem.com
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Analysis of six reasons for the pollution of stone curtain wall