地铁施工对邻近既有桥梁主动防护技术的研究

为保证在地铁施工过程中邻近既有桥梁的安全,提出主动防护的理念,以预防风险为核心,对风险来源(施工开挖)、风险载体(地层变形)、风险对象(既有桥梁)等不同对象中的风险状态进行预判,通过工前预测、及早干预、主动应对来实现对既有桥梁的保护,充分发挥防护的主动性,并将其应用于北京西三环暗挖穿越既有花园桥的施工过程。结果表明,穿越施工主动防护体系达到了预期的控制目标,实现了既有桥梁在隧道施工过程中的安全运营。

Study on Active Protection Technology for an Existing Bridge Adjacent to a Subway Project

In order to ensure the safety of existing bridge during the construction,the active protection concepts were put forward in this paper.By taking risk prevention as the core aim,the risk situations of different objects were prejudged,such as risk source(excavation),risk carrier(ground deformation),risk object(existing bridge).The existing bridge was protected by prediction before construction,early intervention and active response.The initiative of protection was completely utilized.And this method was successfully applied to covered excavation cross the existing Hua Yuan Bridge on western 3rd ring-road of Beijing.It is shown that the proposed control targets were met and safety management was guaranteed during the construction.