在1977～1979年间建造了一栋两层楼的建筑物。整栋结构的外墙面为预制混凝土墙板。混凝土墙板安装后,即发现大量裂缝,雨水使得这种裂缝更加明显。一般说来,裂缝是任意发生的,其宽度在1.59mm范围内。1.现场观察为确定裂缝的走向和严重程度;借助于测量放 A two-story building was built between 1977 and 1979. The external wall of the entire structure is prefabricated concrete wall panels. After the concrete wallboard was installed, a large number of cracks were found, and rainwater made this crack more visible. In general, cracks occur arbitrarily and their width is in the range of 1.59mm. 1. Field observation to determine the direction and severity of cracks;