连续梁-钢管拱组合桥快速施工关键技术  

Key Technology for Rapid Construction of Continuous Beam-Steel Tube Arch Composite Bridge

作　　者：王仲兵 WANG Zhongbing(Sinohydro Bureau 7 Co.,Ltd.,Chengdu Sichuan 610213)

机构地区：[1]中国水利水电第七工程局有限公司,四川成都610213

出　　处：《四川水力发电》2024年第5期1-5,共5页Sichuan Hydropower

摘　　要：连续梁-钢管拱组合桥系将连续梁与钢管混凝土拱两种结构结合在一起,具有跨越能力强、整体刚度大、施工方便的优点,较好地解决了高速行车对桥梁的要求,其广泛应用于跨径为60~200 m间的铁路、公路桥梁中。但连续刚构钢管拱组合存在结构复杂、桥梁的结构形式转换频繁、采用的施工方法多、工艺复杂多变,且因工期紧、现场安全和协调难度突出等问题。针对大跨度连续梁-钢管拱组合桥结构复杂、体系转换多、施工难度大的特点,提出了大跨度连续梁大节段支架现浇结合挂篮悬臂施工技术并予以实施,同时研发出一种能有效调节混凝土连续梁悬臂施工过程中荷载平衡的装置及调节方法,其适用性及可操作性强,安全可靠性高。在所依托工程0号块施工过程中,项目部技术人员根据实际情况提出了采用隐性反拉预压技术替换传统的显性堆载技术,避免了堆载过程中的施工干扰,消除了显性堆载施工过程中的安全隐患,提高了工作效率。在钢管拱施工过程中设置了支墩,提出了钢管拱安装与铺架平行作业工法并予以实施,保障了工程全线的铺架工期。The continuous beam steel tube arch composite bridge combines the continuous beam and steel tube concrete arch,which has the advantages of strong crossing ability,large overall stiffness,convenient construction,and has better solve requirements of the high-speed traffic on the bridge,widely used in the span of 60~200m railway,highway bridge.However,the structure of continuous rigid steel tube arch composite has complex structure,frequent structural system conversion of the bridge,many construction method,complex and changeable process,tight construction period,prominent site safety and coordination difficulties.Aiming at the characteristics of complex structure,multiple system conversion and difficult construction of long-span continuous beam arch composite bridge,the construction technology of cast-in-place support of large-span continuous beam combined with hanging basket cantilever is firstly proposed.At the same time,a device and adjustment method which can effectively adjust the load balance in the construction process of concrete continuous beam cantilever is developed,which has strong applicability and operability,and high safety and reliability.In the construction of No.0 block,the implicit reverse tension preloading technology is proposed to replace the traditional explicit overloading technology,which avoids the construction interference in the process of overloading,eliminates the safety hazards in the process of explicit overloading and improves the work efficiency.In the construction of steel tube arch,support piers are set up,and the construction method of steel tube arch installation and laying parallel is put forward,which guarantees the construction period of the whole line.

关 键 词：大跨度连续梁-钢管拱组合桥 平衡调节装置及方法 隐性反拉预压 钢管拱安装与铺架平行作业 施工技术 

分 类 号：U215[交通运输工程—道路与铁道工程] U215.7U24