大跨度钢管拱大节段垂直提升施工关键技术

Key Technology of Vertical Lifting Construction for Large Section of Long-span Steel Tube Arch

针对汉十高速铁路崔家营汉江特大桥的(135+2×300+135) m连续刚构-拱组合体系,应用大跨度钢管拱大节段垂直提升施工技术,在桥梁位于水面或地质条件较差等不利条件下,对连续刚构拱桥拼装施工工艺进行优化。相对于常规的缆索吊装斜拉扣挂法,大跨度钢管拱大节段垂直提升施工技术可有效降低施工难度,尤其降低中间提升拼装段每节拱肋的安装难度,并节省拱肋架设时间及吊装机械占用时间,具有施工便利、风险小等优点,适合在类似项目中推广应用。

With regard to the(135+2×300+135) m continuous rigid frame-arch composite system of Cuijiaying Hanjiang River Grand Bridge of Wuhan-Shiyan High Speed Railway, the vertical lifting construction technology of large section of long-span steel tube arch was adopted to optimize the construction technology of continuous rigid frame-arch bridge under such unfavorable conditions as the bridge location with unfavorable water surface and geological conditions. Compared with the conventional cable-stayed suspension method, the vertical lifting construction technology of large sections of long-span steel tube arch can effectively reduce the difficulty of construction, especially for the installation of each arch rib in the middle hoisting assembly section. With the features of convenient construction and low risk, it can also save the erection time of arch ribs and the occupation time of hoisting machinery, which is suitable for promotion and application in similar projects.