檐口在立面构图中占有重要的地位。为了防止屋面雨水流浸墙面,一般都将檐部挑出墙面。挑檐的大小,首先取决于功能使用要求和结构的合理性,同时,也受立面比例关系的制约。比如,当建筑总高度较大时,出檐可大些,檐口也相应要厚些,反之则应小些薄些。这就是比例相称的要求。 The mouth occupies an important position in the composition of the facade. In order to prevent the roof from flowing into the wall, the stern is usually picked out of the wall. The size of provocation depends primarily on the functional requirements and the rationality of the structure. At the same time, it is also constrained by the proportion of facades. For example, when the total height of the building is large, the outfall may be larger, and the mouthwash should be thicker. On the contrary, it should be smaller and thinner. This is a proportionate requirement.