钢管混凝土拱桥拱肋吊装方案比选

Comparison and Selection of Arch Rib Hoisting and Installation Schemes for Concrete-Filled Steel Tubular Arch Bridge

文惠桥改造工程主桥由3孔净跨径为108m的中承式哑铃形钢管混凝土拱和两边孔净跨径为62m的上承式钢筋混凝土箱肋拱组成。为在预定工期内实现该桥安全架设、顺利合龙的目标,从地形条件、工期、施工难度、线形控制、成本等方面,对钢管拱肋的3种吊装方案(缆索系统加扣塔扣挂分段吊装、双浮吊单片拱肋吊装、双浮吊三节段双拱肋无扣塔扣挂吊装)进行比选,确定采用双浮吊三节段双拱肋无扣塔扣挂吊装作为实际施工方案,运用有限元法建立主桥空间模型对选定方案进行验算分析,结果表明该方案合理可行。

The main bridge of the renovation project of Wenhui Bridge incorporates a half through dumbbellshaped concretefilled steel tubular arch with three spans each 108 m in net length, which are flanged at each side by a deck arch structure with reinforced concrete box arch ribs and with net span length of 62 m. In order to achieve the goal of safe erection and smooth clo sure of the bridge within the scheduled construction period, the three hoisting and installation schemes for the steel tubular arch ribs, including segmental hoisting and installation using cable system with fastening towers and fastening stays, using two floating cranes to carry out the hoist ing and installation of a single arch rib and using two floating cranes to hoist and install three seg ments each time without fastening tower and fastening stays, were compared and analyzed from as pects of topographic condition, construction time, difficulties of construction, geometry control and cost. Finally, the construction scheme of using two floating cranes to hoist and install three segments each time without fastening tower and fastening stays were chosen. The finite element spatial model of the main bridge was built to carry out checking analysis of the chosen scheme. The results of the analysis demonstrated that the scheme was rational and applicable.