城市跨河飞燕式钢箱拱桥先梁后拱施工技术研究

Research on the Construction Technology of the First Beam and then Arch of the Urban Cross River Flying Swallow Style Steel Box Arch Bridge

随着我国城市建设的不断加快,市政交通工程迅速增加。为了营造美观环境,进一步加强结构与环境的协调统一,在城市跨河区域通常采用拱桥结构形式。由于城市内的河道一般过水量较少,或季节周期性排水,城市拱桥采用弱拱强梁的结构形式尤为常见。以赤峰市中环路快速化改造工程土建四标阴河大桥主桥上部结构施工为例,针对城市跨河飞燕式钢箱拱桥施工的特点,从场地布置、拱桥节段划分、支架结构形式、节段安装顺序、体系转换等方面,详细介绍了一种先梁后拱的架设方式。其有别于通常拱桥先拱后梁的架设施工,具有施工便捷、便于控制安全质量等优点,可供类似工程参考借鉴。

With the continuous acceleration of urban construction in our country,municipal transportation projects are rapidly increasing.In order to create a beautiful environment and further strengthen the coordination and unity between structure and environment,arch bridge structures are usually used in urban river crossing areas.Due to the generally low waterflow of urban waterways or seasonal periodic drainage,it is particularly common for urban arch bridges to adopt a weak arch and strong beam structure.Taking the construction of the upper structure of the main bridge of the Yinhe Bridge in the fourth standard of civil engineering for the rapid transformation project of the Central Ring Road in Chifeng City as an example,this paper focuses on the characteristics of the construction of the urban cross riverflying swallow style steel box arch bridge,mainly from the aspects of site layout,arch bridge segment division,support structure form,segment installation sequence,system transformation,etc.,and introduces in detail a method of erecting beamsfirst and then arches.It is different from the usual construction of arch bridges where the arch isfirst arched and then the beam is erected.It has the advantages of convenient construction,easy safety and quality control,and can be used as a reference for similar projects.