大跨高墩连续刚构桥挂篮悬臂浇筑施工关键技术分析

Key Technical Analysis of Cantilever Casting Construction of Large-span High Pier Continuous Rigid Frame Bridge with Hanging Basket

摘要:

针对四川山区大跨高墩连续刚构桥施工场地狭窄、峡谷风荷载多变、线形控制难度大等工程难题,文章以四川某高速公路主跨160 m的连续刚构桥为依托,围绕挂篮悬臂浇筑施工全流程开展技术优化研究,通过推行挂篮轻量化设计、增设峡谷抗风稳定装置、构建自适应线形调控体系、改进合龙段施工工艺,构建适配高墩大跨场景的成套施工技术体系。工程实践表明,该技术体系可以有效缓解挂篮随风晃动的现象,提升线形控制精度,保障混凝土浇筑质量。

Abstract:

In response to the engineering challenges of narrow construction sites, variable wind loads in canyons, and difficult linear control of large-span and high pier continuous rigid frame bridges in mountainous areas of Sichuan Province, this article relies on a continuous rigid frame bridge with a main span of 160 m on a highway in Sichuan Province, and conducts technical optimization research on the entire process of hanging basket cantilever pouring construction. By promoting lightweight design of hanging baskets, adding wind resistant and stabilizing devices in canyons, constructing an adaptive linear control system, improving the construction process of the closure section, a complete set of construction technology system suitable for high pier and large-span scenarios is constructed. Engineering practice has shown that this technology system can effectively alleviate the phenomenon of hanging baskets swaying with the wind, improve the accuracy of linear control, ensure the quality of concrete pouring.