民用建筑现浇板式双跑楼梯基础的通常作法是,随同建筑物的基础一起挖基槽、做垫层、浇混凝土基础和砌筑砖基础,然后再浇筑楼梯地梁及楼梯段。地梁的长度一般为楼梯间开间的一半,截面一般为240mm×240mm。这种作法地下施工部分多,既费工费事,又浪费材料,还相对地影响基础工程施 The common practice of cast-in-place double-running staircase foundations for civil buildings is to excavate foundation trenches, make cushions, pour concrete foundations and masonry foundations together with the foundations of the buildings, and then pour the stair beams and stair sections. The length of the ground beam is generally half of the opening of a stairwell, and the section is generally 240mm×240mm. This method has many underground constructions, which not only wastes labor costs, but also wastes materials, and also relatively affects basic engineering facilities.