小直径钻孔灌注桩通常作群桩设置,它们主要的应用范围是对原有建筑进行托换技术,在基坑开挖方面(即地下工程施工),它们常常也要承受相当大的水平荷载。承受侧向荷载密集的树根桩桩群一般都象复合体起作用,它的承载能力通过类似钢筋砼的理论来估算,这个假定已经在几个施工现场得到证明。因此,这种桩群被称为“栅墙”(bar wall)。 Small-diameter cast-in-place bored piles are usually set as group piles. Their main application scope is the underpinning technology of existing buildings. In excavation of foundation pits (ie underground construction), they often also have to bear considerable horizontal loads. . The root piles that are subject to lateral loads are generally acting like complexes. Its load carrying capacity is estimated by a theory similar to that of reinforced concrete. This assumption has been proven on several construction sites. Therefore, this kind of pile is called a “bar wall”.