某海水浴场的设计有一处现浇楼梯为螺旋形,平面见图1。施工工期紧,迫使我单位采取了预制混凝土踏步板、现浇钢筋混凝土柱的施工方法。具体做法如下:1.将现浇混凝土楼梯改成预制混凝土楼梯施工,首先要改变设计,我们采用将踏步板预制、主柱现浇 The design of a bathing beach has a cast-in-place staircase with a spiral shape. The plane is shown in Figure 1. The construction period was tight, forcing our unit to adopt the construction methods of precast concrete tread boards and cast-in-situ reinforced concrete columns. The specific methods are as follows: 1. To change the cast-in-place concrete stairs into prefabricated concrete stairs, we must first change the design. We use prefabricated prefabricated slabs and cast-in-place concrete columns.