小净空上跨营业线连续梁中跨合龙吊架施工关键技术

Key Construction Technology of Mid-span Closing Hanger with Small Clearance for Continuous Girder over Business Line

新建武汉—十堰高速铁路云安特大桥转体连续梁上跨营业线汉丹铁路,梁底距离铁路净空仅2.2m。基于传统跨营业线合龙的方法,提出了一种新型可行走吊架法,并利用有限元建模分析了其可行性,在实际施工过程中成功解决了跨营业线小净空合龙施工技术难题。

The swivel continuous girder of Yun＇an Bridge,which is a part of the new-built high-speed railway from Wuhan to Shiyan,and is designed over Wuhan-Danjiangkou business line. The clearance distance between the line and girder bottom is only 2. 2 m. This paper proposes a new method named walkable hanger based on the traditional method of closure constructions over business line,and its feasibility is analyzed by finite element modeling. Small clearance construction technology problems over business line are successfully solved.