Design method of big-diameter well

The invention discloses a design method of a big-diameter well. The method comprises the following steps: firstly, alternately arranging cast-in-place plain concrete piles and cast-in-place reinforced concrete piles, so that a well wall of the big-diameter well is formed; casting an annular crown beam at the upper side of the well wall of the big-diameter well and arranging reserved steel bars on the annular crown beam; then, arranging a steel ring beam at the bottom of the big-diameter well, filling side seams with gravels and casting a plain concrete ring beam; and then, uniformly paving prefabricated slabs on the upper surface of the annular crown beam, and implementing secondary annular crown beam casting at a formed top, so that a first layer of base plate is formed. With the application of the design method, construction difficulty of the entire big-diameter well is reduced, safety risk is reduced and construction cost is reduced, and meanwhile construction quality is guaranteed. 本发明公开种大口井设计方法，该方法通过先交替设