随着建筑工业的日益发展,桩基的应用越来越广泛。十多年来,我单位在广州、佛山、深圳等地几十幢多层和高层建筑设计中采用了各种类型的桩基。近几年来,采用了不少人工挖孔桩和少量内冲沉管式灌注桩。本文就外击式沉管灌注桩在多层建筑中应用综述如下。一、沉管灌注桩的使用范围与施工沉管灌注桩虽然单桩承载力低,且在施工过程中的振动对邻近建筑物有影响,但由于其施工设备较简单,桩长可随实际地质条件确定,经济效果较好,故仍然被广泛采用。这种桩只能打到硬塑至坚硬土层或中密砂层。广东各地普遍采用的桩径为φ340 With the increasing development of the construction industry, the application of pile foundations has become more and more extensive. For more than a decade, our company has used various types of pile foundations in dozens of multi-storey and high-rise building designs in Guangzhou, Foshan and Shenzhen. In recent years, many manual digging piles and a small number of inner-impregnated tubular piles have been used. This article summarizes the application of external impact immersed cast-in-place piles in multi-story buildings. First, the scope of use of cast-in-place bored piles and construction of cast-in-place bored piles Although the bearing capacity of single pile is low, and the vibration in the construction process has an impact on neighboring buildings, but due to its simple construction equipment, the length of the pile can follow the actual geology Conditions are determined and the economic effect is good, so it is still widely used. This pile can only hit hard plastic to hard or medium dense sand. The commonly used pile diameters in Guangdong are φ340