Comparison of Erection Schemes for Steel Tube Arch of Main Bridge of Huanghe River Bridge on Zhungeer-Shuozhou Railway

The main bridge of the Huanghe River Bridge on Zhungeer-Shuozhou Railway is a concrete-filled steel tube(CFST)deck arch bridge with a main span of 380 m.The main arch ribs of the bridge are the spatial truss structure that is composed of the CFST main chords and box steel web members.In the light of the structural features and construction difficulties of the bridge,the scheme of assembling the main arch ribs on scaffoldings and closing the arch ribs by vertically rotating and the construction scheme of fastening stay method for lifting the single arch rib element and integrally lifting the double arch ribs element were proposed.Through comparison of the technical feasibility and the construction cost and safety,it was determined that the construction scheme of fastening stay method for both lifting the single arch rib element and integrally lifting the double arch ribs element should be adopted.For the arch rib element that was heavier than the designed lifting capacity of the cable crane,the single arch rib element was lifted only,the single-leg rib at each side of the element was respectively lifted and the K-shape struts and cross struts were installed to form the complete designed element in the air.The rest of the arch rib elements were assembled into the designed elements in the assembling yard,were integrally transported to the underneath of the cable crane and integrally lifted and connected with the previous arch rib elements in the air.Then,the fastening stays were fixed to gradually form each half arch and finally two half arches were closed and the concrete was pumped in to the steel tubes of the whole arch.