下穿既有公路桥梁浅埋隧道施工技术

Construction Technology of Shallow Tunnel Underpassing Existing Highway Bridge

我国经济建设快速发展下,交通体系愈加完善和便利,极大便利了城市生产生活。我国交通建设发展迅猛,但对于已建成公路网,部分隧道工程需要下穿公路桥梁建设。隧道施工会干扰周边土地层、破坏原有应力场。施工中出现土地变性问题,在桩基与周边环境相互作用力下,会向邻近桩基传递,导致桩基变形。随着问题严重化,会导致公路桥梁结构稳定性降低而失衡。因此在隧道下穿既有构筑物项目施工中,需要保证施工技术与管理到位。

With the rapid development of China's economic construction,the transportation system has become more perfect and convenient,which greatly facilitates urban production and life.The transportation construction in China is developing rapidly,but for the already built road network,some tunnel projects need to be constructed under the road and bridge.Tunnel construction will disturb the surrounding soil layer and destroy the original stress field.The problem of land degeneration occurs during construction.Under the interaction force between the pile foundation and the surrounding environment,it will be transmitted to the adjacent pile foundation,causing the pile foundation to deform.As the problem becomes serious,the stability of the highway bridge structure will decrease and become unbalanced.Therefore,it is necessary to ensure that the construction technology and management are in place during the construction of the tunnel underneath the existing structure.