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 function”, 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.

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