Abstract:The circular foundation pit support structure has good mechanical force characteristics during excavation and is more commonly used in the foundation pit support of large anchors. According to the xx bridge east anchorage foundation pit support project, the construction process of the new pile-wall snap circular anchor foundation pit support construction process was studied. The results show that the pile foundation construction was used as the first phase of construction, the underground diaphragm wall was used as the second phase of construction. The pile foundation construction of the first phase should be skipped construction, and the difference of age between the underground diaphragm wall and the pile foundation should be reduced; the steel guide wall can effectively shorten the construction period instead of the conventional guide wall and avoid the cumbersome process of conventional guide wall production。