Design and Technology Innovation of Cangrong Xunjiang Bridge
The Cangrong Xunjiang Bridge spans the Xunjiang River,with a total length of 1 688 m,adopting a central single-column tower design solution,with the span layout of two 520 m main spans and two 55 m side spans.The middle tower is 108.9 m high,and the side tower is 108.8 m high.The bridge is a three tower space cable anchor suspension structure.The main beam adopts a split type steel box girder,consisting of two steel box girders with a height of 3.0 m and a full width of 36.2 m,as well as a transverse connecting box.The anchor foundation is a pile foundation+milling joint scheme structure,which adopts a shear wall structure formed by the pile foundation and the second phase slot.The diameter of the pile foundation is 3 m.The side of the bridge main span is a space cable with the center distance of 1 m from the cable tower,and the standard strength of the main cable is 1 960 MPa.In response to the complex construction conditions in the bridge site area,the structural system of the three tower space cable suspension bridge of Cangrong Xunjiang Bridge has been innovated.A new type of permanent force anchor foundation structure combining large diameter piles and diaphragm wall is adopted for the first time.The cable beam construction technology of the three tower space cable suspension bridge has been developed,and the composition and combination optimization design method of steel bridge deck paving materials have been established,forming a complete set of key technologies for the three tower space cable suspension bridge of Cangrong Xunjiang Bridge,leading a new leap in the construction of space cable suspension bridges in China.
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