建筑物的钢筋混凝土天沟,往往由于温度膨胀而产生裂缝。不论是现浇天沟还是预制天沟,都存在这个问题。作者在过去的施工中采取了一些处理。经过多年观察,没有发生裂纹。实践证明处理办法是可行的。现分述于下: 1.现浇挑檐钢筋混凝土天沟,往往每隔10至15米有一条横向裂纹,在阴阳角处也大多数有裂缝,尤其是阴角几乎是均有裂缝。(大雨蓬如有阴角的也 The reinforced concrete gutter of a building often causes cracks due to temperature expansion. This problem exists whether it is a cast-in-place gutter or a prefabricated gutter. The author took some steps in the past construction. After many years of observation, no cracks have occurred. Practice has proved that the treatment method is feasible. Are described in the following: 1. Casting provocation of reinforced concrete gutters, often every 10 to 15 meters with a horizontal crack, at the yin and yang corner also most of the cracks, especially the internal corners are almost all cracks. (If there is a big awning in the corner,