我在多年的土建施工中发现,普通楼梯的结构设计图和建筑设计图大多如图1的形式。楼梯踏步拐弯处的横梁边线是上段梯梯踏步的起线,又是下段楼梯踏步的终线。设计人员在结构图和建筑图上都把这三条线画成重合的通线。结构图这样画是对的,建筑图这样画就错了。实际上,楼房主体结构施工后,建筑抹灰三条线 I have found in many years of civil construction that most of the structural drawings and architectural designs of ordinary stairs are shown in Figure 1. The sideline of the beam at the turn of the stairs is the starting line of the steps of the upper ladder and the final line of the next step. The designers painted the three lines as coincident lines on both the structural and architectural drawings. The drawing of the structure is correct, and the drawing of the building is wrong. In fact, after the construction of the main structure of the building, the three lines of the construction plastering