摘要
以一主跨178 m的提篮式钢管混凝土劲性骨架上承式拱桥施工项目为背景,介绍了该类桥梁施工中所涉及的拱座大体积混凝土浇筑、拱脚施工精度控制、吊索及拱肋施工控制、拱肋及连续梁施工方法等关键技术。通过改变混凝土配合比、分批分段浇筑、设置冷凝管等方法,有效解决了大体积混凝土温度裂缝问题;通过初步定位、精确微调等方法解决了拱肋与拱座钢管对接问题;通过有限元仿真技术和BIM技术实现了施工中吊索及拱肋的控制,钢管拱合龙后高程最大误差为1.1 cm。在立柱、拱肋及梁体施工中采用对称翻模施工、预偏量反向设置、"三环十三面"法和连续梁分批分次法,保证了工程质量及进度。
Based on a construction project of a basket-type concrete-filled steel-tube（CFST） deck arch bridge with the main span of 178 m,some key problems such as large volume concrete casting of arch abutments,precision control of arch footing construction /construction control of the suspended cables and arch ribs /construction method of arch ribs and the continuous girder were introduced.The temperature crack of the massive concrete is effectively solved by altering the mixture ratio of concrete partial pouring of concrete,sectional pouring of concrete and setting up condenser pipes.Also,the abutting joints between arch ribs and steel tubes on the arch abutment are solved by the initial localization and the precise fine adjustment technique.The control of suspended cables and arch ribs during construction is accomplished by means of numerical simulation and BIM（Building Information Modeling）technology,and the maximal error of elevation can be controlled to 1.1 cm after the closure of the CFST arch bridge.Furthermore,the symmetrical over-form construction,the reversed pre-offsetting installing,the method of ＂three rings plus thirteen surfaces＂,and the partial and sectional pouring of concrete are used in the construction,which can guarantee the construction quality and progress.
作者
贾红梅
张明波
JIA Hongmei ZHANG Mingbo(China Railway Society, Beijing 100844, China Metallurgical Corporation of China Ltd., Beijing 100028, China)
出处
《铁道建筑》
北大核心
2017年第2期21-25,共5页
Railway Engineering
关键词
提篮拱桥
钢管混凝土
劲性骨架
连续梁
施工技术
Basket-type arch bridge
Concrete-filled steel-tube
Stiffening framework
Continuous beam Construction technology
