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目前钻孔灌注桩基中的桩均为园形截面,和矩形截面的桩相比,园桩的周长、断面系数较小,抗弯能力差。所以,当桩的截面积、长度相同时,园桩的垂直及水平承载能力都小于矩形桩。若将目前广泛采用的园桩改为矩形桩,不但可提高桩基的承载能力、节省工程量,而且还可加快施工进度、大幅度降低桩基费用。为改进桩基结构,提高其承载能力,本文对园桩和矩形桩的承载能力,进行了计算比较,并在实践的基础上,提出了矩形钻孔灌注桩和大型深基的钻孔灌注施工方法。
At present, the piles in the cast-in-place bored pile are all circular sections. Compared with the rectangular sectioned piles, the circumferential length and the section coefficient of the pile are small, and the bending resistance is poor. Therefore, when the pile cross-sectional area, the same length, the vertical and horizontal bearing capacity of the pile is less than the rectangular pile. If we change the widely used piles to rectangular piles, not only can increase the bearing capacity of piles, save the amount of works, but also speed up the construction progress and greatly reduce the pile cost. In order to improve the structure of pile foundation and increase its bearing capacity, the carrying capacity of the circular pile and the circular pile is calculated and compared in this paper. On the basis of practice, a rectangular bored pile and a large deep foundation bored and perforated construction method.