房屋建筑外墙门窗洞口上方,一般均设置带楣或不带楣的门窗过梁。为防止雨水顺过梁下面倒流污染墙面或腐蚀门窗,一般的做法是在外墙装饰时,过梁下面外口粉饰滴水线或做鹰嘴滴水。工人操作抬头作业,费工费时, Above the door and window openings of house building exterior walls, doors and windows with or without sill beams are generally installed. In order to prevent the rain from flowing down the walls of the beam or causing corrosion to the doors and windows, the general practice is to decorate the dripping line or do gargoyle dripping at the outside of the lintel under the lintel. Workers operate head-up operations, which are time-consuming and labor-intensive.