Generally speaking, there are cracks in rural buildings, especially in brick-concrete structures, which are mainly concentrated in three places: cracks in walls, cracks in roofs, cracks in floors and terraces. In today's problems, the main problem is wall cracks, which is also the most common phenomenon of housing cracks. Let's have a look.
Wall cracks are usually caused by the following reasons: first, uneven settlement of foundation, which is the most common reason for wall cracks in most houses. Building houses in the countryside is different now. When people build new houses, most of them will build villas with two or three floors or even higher, which is much more complicated than building simple bungalows in the past, and the foundation load is many times larger than that when building Jianping houses. If we don't pay attention to the detection of foundation before building, it may lead to the settlement of foundation and cracks after building is completed. For example, some foundations used to be garbage, fish ponds and silt. When building a house, these miscellaneous soils must be replaced or even piled to lay the foundation well, otherwise there will be great security risks. In addition, setting reinforced concrete ring beams in buildings will also improve the crack resistance of buildings when they settle, so the foundation is very important, so don't be reluctant to spend this money.
Second, when building a house, we should strictly control the quality of the building, strictly follow the design drawings, and don't make any changes at will. For example, don't make holes in the load-bearing wall when decorating. After a long time, it may lead to cracks in the wall. For example, when building a wall, the mortar joint should be full and the thickness should be moderate, so as to improve its compressive strength and reduce the possibility of cracks in the wall.
Third, the change of temperature difference, which is one reason why people don't pay much attention to it. Due to the different expansion coefficients of various materials constituting the wall structure, cracks will occur when the local temperature difference between day and night is large or the seasonal temperature difference is large enough. In this way, the temperature difference can be reduced by setting thermal insulation layer and thermal insulation layer, thus reducing the probability of cracks. In addition, if the building materials are used improperly, it will also cause the wall to crack.
The above are some common causes of wall cracks. However, when cracks appear in the wall, don't worry too much, because not all cracks need to be repaired. According to the Technical Manual for Village Renovation compiled by the Rural Construction Bureau of the Ministry of Housing and Urban-Rural Development, "Generally speaking, when the crack width of masonry members is less than 2mm, the bearing capacity will only decrease by 15%, which can be used as the limit for not repairing." ? So if you have any suggestions, because the analysis of wall cracks is a professional problem, it must be dealt with according to the actual situation, not a question and answer or an article, so it is best to find local professional and technical personnel to identify and deal with it according to different situations. This will be reassuring.