明敷管道对周边既有桥墩的影响分析

Analysis on Impact of Exposed Pipelines on Adjacent Existing Bridges Piers

摘要:

随着城市中建筑密集化程度加深，在密集的城市建筑群中明敷给排水管道的情况时有发生，这对设计及施工方案提出更高的要求。通过对穿越既有桥墩的给排水管道进行有限元模拟，分析管槽开挖对桥墩水平位移和竖向位移的影响，发现当管槽距离桥墩较近时，管槽开挖引起的桥墩变形偏大。为保证桥墩的安全运行，应充分保证管槽与既有桥墩之间的安全距离；同时，当相近的管道同步施工时，应尽可能采取单管管槽开挖形式，避免沟槽开挖宽度过大。通过分析讨论，期望对类似项目的设计和施工有一定的借鉴。

Abstract:

With the increasing density of buildings in cities, the exposed installation of water supply and drainage pipelines within densely urban building clusters has become increasingly common. Consequently, there is a growing demand for design and construction schemes. A finite element simulation is conducted to the water supply and drainage pipelines crossing the existing bridge piers, which analyzes the impact of pipe trench excavation on the horizontal and vertical displacements of these bridge piers. It is found that when the pipe trench is close to the bridge pier, the deformation of the bridge pier caused by the excavation of the pipe trench is relatively large. To ensure the safe operation of bridge piers, the safety distance should be fully ensured between the pipe trenches and the existing bridge piers. At the same time, when adjacent pipelines are constructed simultaneously, the single-pipe trench excavation form should be adopted as much as possible to avoid excessive trench excavation width. Through analysis and discussion, it is expected to provide certain references for the design and construction of similar projects.