Suspension protection excavation method for existing pipeline: Fid-Bau Portal

Suspension protection excavation method for existing pipeline

ZHAO WEIPENG / HU GUANG'AN / HUANG JUNHUA / ZHU DEWEI

The invention discloses a suspension protection excavation method for an existing pipeline, which can effectively protect the pipeline, reduce the disturbance of soil around the pipeline in the underground structure construction process and ensure the stability of the pipeline in the underground structure construction process under the condition that the pipeline is not migrated. The suspension protection excavation method for the existing pipeline comprises the steps that construction preparation is conducted, and earth surface sundries in a construction area are removed; the current pipeline is searched, the position of the current pipeline is marked, and then support piles are constructed around the excavation construction area; crown beams are constructed, and the adjacent supporting piles are connected; a first foundation pit inner support is constructed, and the opposite supporting piles are connected; mounting a supporting beam and a suspension beam; earthwork is excavated layer by layer at the crown beams on the two sides of the pipeline, and retaining walls are constructed; and the pipelines are suspended, earthwork is excavated in a layered mode in an excavation construction area defined by the supporting piles, and a retaining wall is constructed till construction reaches the foundation elevation.

本发明公开了一种既有管道的悬吊保护开挖方法，能够在不迁移管道的情况下，对管道进行有效防护，减小地下结构施工过程中的管道周围土体的扰动，保证管道在地下结构施工中的稳定性；该既有管道的悬吊保护开挖方法包括施工准备，清除施工区域的地表杂物；摸查现状管线，标记出现状管线的位置，然后在开挖施工区域的周围施工支护桩；施工冠梁，将相邻的支护桩连接；施工第一道基坑内支撑，将相对的支护桩连接；安装支撑梁和悬吊梁；在管线两侧的冠梁处分层开挖土方，施工挡墙；悬吊管线以及在支护桩围成的开挖施工区域内分层开挖土方，施工挡墙，直至施工到基底标高等步骤。

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