The Design of Flexible Arch with Long Steel Truss Girder of Xiong'an-Shangqiu High-speed Railway Yellow River Bridge
In order to meet the requirements of wide channel of the Yellow River,high seismic intensity and high-speed running on ballastless track,after comparing and selecting bridge type schemes,Xiong'an-Shangqiu high-speed Railway adopts the flexible arch of long connected porous continuous steel truss beam across the Yellow River,and the span arrangement is(60+80+4×260+280+80+60)m with a link length of 1 602.7 m.The main bridge of the Yellow River Bridge has a truss height of 15 m and a truss width of 13.8 m.The triangular truss with vertical bars is used,the arch height is 50 m,and flexible suspenders are employed.The bridge deck is made of orthotropic steel deck,and 15 cm thick concrete slabs are laid on it to facilitate the laying of ballastless track.The lower part of the bridge adopts double column reinforced concrete solid pier,and the pile foundation adopts 2.0 m diameter friction pile with 2.0 m diameter.The pile foundation uses the pile bottom grouting technology to effectively reduce the pile length.Finally,based on the specific situation of the bridge location,a construction plan of steel truss beam suspension assembly and steel arch vertical rotation is applied.The research results indicate that the long steel truss flexible arch structure has good stiffness,with a beam end angle control of 0.778‰rad and a vertical stiffness of 1/2 107;Each member,suspension rod,anchor box,arch foot and other complex load-bearing parts meet the specification requirements;The suspension and vertical rotation construction plan can make secondary use of the tower buckle and open multiple working faces at the same time,which can greatly save the construction time and have good economic efficiency.The design and construction of the bridge will provide references for the construction and development of the long ballastless track steel bridge of China's railways.
high-speed railwayrailway bridgeYellow River Large Bridgelong coupletsteel truss beam flexible archballastlesscantilever assembly methodsteel arch vertical rotation
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