多重预顶撑技术在地铁密贴穿越工程中的应用

Research on the Multiple Pre-top Bracing Technology in Subway Close-attached Undercrossing Engineering

以北京地铁新建10号线公主坟站密贴下穿既有1号线为工程背景,探讨多重预顶撑施工技术,并设计一种新型的顶撑平台系统,研究多重预顶撑施工技术在大跨度密贴穿越施工中的应用。数值分析及实测结果表明,在暗挖施工中,多重预顶撑技术是一种主动防御变形、控制沉降的有效措施,按照既有站的变形状况,动态调整千斤顶顶力,达到控制沉降发展的效果,在密贴穿越施工中具有非常高的实用性。

It is of great significance for the design and construction of similar underground projects to study the multiple pre-top bracing technology in subway close-attached undercrossing engineering. In this paper, by taking the New Gongzhufen station of Beijing Subway Line 10, which is close-attached undercrossing the existing Subway Line 1 as background, the application of multiple pre-top bracing construction technology is explored, and a new kind of top bracing platform system is designed, and the application of multiple pre-top bracing construction technology in the large span of close-attached undercrossing engineering is studied. Numerical analysis and experimental results show that, the multiple pre-top bracing construction technology is an active deformation defense and effective measure to control the settlement. This technology is highly practical in the close-attached undercrossing construction if the jack pressure is dynamically adjusted to control the settlement in line with the deformation conditions of existing stations.