我国幅员辽阔,在城乡各地拥有大量的房屋,这些不同年代、结构多样的房屋有相当数量已用了很长时间,许多房屋由于建造年代久远、缺修少养、风侵雨蚀致使建筑材料老化、腐朽;或者因为自然灾害、使用不当等因素的影响,而造成了地基不均匀沉降、墙体开裂、承重构件稳定性不足、承载力减弱等险情。诸如此类的复杂原因或多或少地影响着房屋的住用安全;这些房屋的现 With a vast territory and a large number of houses in urban and rural areas, a considerable number of these houses of different ages and structures have taken a long time. Many houses are aging due to erection of buildings, lack of repair and less rainfall Or decay; or because of natural disasters, improper use of such factors as the impact of uneven subsidence caused by the foundation, the wall cracking, lack of stability of load-bearing components, bearing capacity and other dangers. The complex causes of such affect, to a greater or lesser degree, on the domestic safety of houses;