Design and Construction of Guanshi River Bridge

Located in the middle-low mountainous area of the Dabie Mountain Range,the Guanshi River Bridge is a control project of Macheng-Wuhan Expressway in Hubei Province.The main bridge of the Bridge is a five-span prestressed concrete continuous rigid-frame bridge arranged in separated left and right bridges with span arrangement(67+33×120+67) m,the main girder is of box structure,and the piers of the bridge are designed as two-leg rectangular thin-wall hollow piers with variable sections.In view of the common problems or deterioration that may appear in the construction and operation processes of such type of bridges,the depth of the box girder and the thickness of the bottom slabs were all determined based on the variation of quadratic parabola in the design to improve the mechanical behavior of the structures.And in accordance with the dynamic and life cycle design concept,a given amount of standby ducts for the prestressing strands in the top and bottom slabs were reserved,which would be used in either the construction or operation process if needed.The main girder was cantileveredly cast by triangular cable-stayed form travelers with rear supports and segments No.0 were cast with shaped steel brackets.The load test results of the completed bridge indicate that the bearing capacity of the bridge can meet the design requirements.