目前在一些城市中,采用砖混结构形式的住宅建筑还相当多(砌体材料主要使用粘土砖、煤干石砖、炉渣空心砖、加气混凝土砖、混凝土盲孔砖)。因为基础沉降、温度应变、荷载作用等原因,在房屋的墙体(尤其在房屋的顶层和最上两至三层)、门窗洞口四角部位及其它部位,经常出现各种形状的裂纹和裂缝。建筑物的墙体裂纹和裂缝不仅影响建筑物的安全、美观和使用功能要求(如引起建筑物透风、渗漏);同时这种现象对结构本身, At present, in some cities, there are quite a lot of residential buildings adopting the form of masonry concrete (masonry materials mainly use clay brick, coal-fired dry stone brick, hollow slag brick, aerated concrete brick and concrete blind hole brick). Cracks and cracks of various shapes often appear on the walls of houses (especially on the top and top two to three floors of houses), the four corners of doors and windows and other parts due to the foundation settlement, temperature strain and load. Building wall cracks and cracks not only affect the safety of buildings, aesthetics and the use of functional requirements (such as causing the building ventilation, leakage); the same time, this phenomenon on the structure itself,