浅谈挂篮法悬臂浇筑施工在梁垛河大桥施工中的应用
2015-07-17朱殿明
【摘 要】随着我国经济建设的迅猛发展,交通需求日益增大,交通工程迎来又一轮建设高潮,变截面连续箱梁体系梁桥已成为我国桥梁建设中基本的桥型之一,此类桥梁多采用悬臂浇筑法施工。本文结合某大桥的实际施工情况,通过对挂篮施工悬臂浇筑方法的介绍,全面叙述了悬浇梁施工关键工序、控制要点以及对技术问题的处理措施,为预应力混凝土连续梁桥施工质量控制提供一定的参考。
【关键词】悬臂浇筑法;连续梁 ;质量控制
On the hanging basket method Cantilever Cast beam stack River Bridge construction
Zhu Dian-ming
(The Dongtai transportation Board Dongtai Jiangsu 224200)
【Abstract】With the rapid development of China's economic construction, traffic demand is increasing, traffic engineering usher in another round of construction boom, continuous box girder system of variable cross-section girder bridge has become China's bridge construction one of the bridge, such bridge more thancantilevered poured construction. In this paper, the actual construction of a bridge, through the introduction of the cradle construction cantilever pouring method, a comprehensive description of the key processes of Cantilever beam construction, control points, and measures to deal with technical issues, continuous prestressed concrete beam bridge construction quality control to provide a reference.
【Key words】Cantilever pouring method;Continuous beam;Quality Control
梁垛河是一条规划Ⅴ级航道,梁垛河大桥与其交角90°,桥梁中心桩号为K239+368.5,桥长290.4m,桥宽2×12.75m。其中主桥采用(37+60+37)m三跨预应力混凝土变截面单箱单室连续箱梁,主跨跨中箱梁高度为2.0m,至距墩中心1.75m处按圆曲线变化至3.6m。箱梁在主墩墩顶处设置一道厚度为2.5m的中横梁,中横梁上设人孔,中跨跨中设厚度为0.4m的横隔板,边跨端部设厚度为1.4m的端横梁,其余部位均不设横隔板。箱梁顶板设2%的单向横坡,底板保持水平,采用纵、横、竖三向预应力体系。引桥为6孔25 m装配式部分预应力混凝土连续箱梁,主墩采用钢筋混凝土矩形实体式薄壁式墩,群桩基础式承台。
1. 0#块施工方法和工艺
梁垛河大桥主桥为双幅预应力混凝土变截面单箱单室连续箱梁,跨中梁高2.0米,主墩中心梁高3.6米,跨径组合为37+60+37米。0#块长度为11.0米,混凝土方量为171.10米3,考虑到整个0#块混凝土体积不大,梁高也只有3.6米,采用附墩三角刚性支架做支撑,以型钢组拼形成钢平台,在钢平台上铺设底模及腹板、翼板支架以形成整个模板系统。……
