关键词: 分段护壁成井法, 沉井, 新老管线交叉, 节点开挖

Abstract: In recent years, with the development of the urban renewal as well as the renovation of old residential areas and blocks, many problems that are not occurred in the conventional new constructions have also been encountered during the development. For example, during the pipe network placement in the process of the renewal and reconstruction, the cross-connection construction of the new and existing underground pipelines is often encountered. Due to the existing underground pipeline, the traditional open caisson method is not feasible. Currently, the common treatment method is to directly adopt the method of deep excavation support plus the open cut and cover at the connection position of the new and the existing pipelines. However, sometimes, due to the unclear quantity, buried depth and direction of underground pipelines, the construction of supporting structure for the deep excavation may damage the existing underground pipelines. In addition, in some old residential areas with restricted construction space, the construction equipment cannot enter the site or there is no operating space. To solve similar problems, designers must seek new methods. This paper introduces a treatment method, which is called segmented slurry wall method, in combination with engineering examples.

Key words: Segmented Slurry Wall Method, Open Caisson, Proposed Pipeline Crossing the Existing Pipelines, Joint Excavation