一般混凝土构件的裂缝主要发生在梁(或桁架)的下部,要测量时或是用梯子或是用行车从下往上测量,此时如使用相纸和放大镜进行对比是比较困难的,当构件裂缝处光线较差、裂缝数量较多时就更加困难了。我们采用了一种更简易的方法,用普通锁针和钢线敲扁成厚度0.05～3.0毫米的塞尺(用游标卡尺校正)。塞尺根部有眼孔 The cracks of concrete members mainly occur at the lower part of the beam (or truss). To measure, either from a ladder or from the bottom to the top, it is difficult to compare the photographic paper with a magnifying glass. It is more difficult when the cracks are poorly lit and the number of cracks is high. We have adopted a simpler method, knocking out a feeler gauge (calibrated with a vernier caliper) with a thickness of 0.05-3.0 mm using a common locking pin and steel wire. There is an eye hole in the root of the feeler