The Huanan Bridge is a three span continuous rigid frame bridge with a length of 110 m+190 m+110 m.After inspection,cracks were found in the pier column,which continued to deteriorate.The main reason is that the pier body stiffness is relatively high compared to the main beam stiffness.It is necessary to reinforce and dispose of the main piers as soon as possible.The main pier anti-collision facilities adopt a concrete wall structure,and the space between the piers and the walls is narrow.The reinforcement of pier columns often adopts the method of increasing the cross-section,and the construction of water reinforcement often uses steel cofferdams to form a dry environment.In order to avoid excessive increase in the stiffness of the pier section after reinforcement,the method of using UHPC to increase the section outside the steel frame for pier reinforcement is proposed.Calculation analysis shows that the reinforcement design scheme has less stress on other components of the bridge.The original design plan for pier column reinforcement construction was to first remove the concrete anti-collision wall,then use a steel cofferdam,and later rebuild the concrete anti-collision wall.In response to the problems of large environmental impact,poor economy,and difficulty in underwater operations in the original design scheme,a scheme is proposed to transform the concrete anti-collision wall and form a dry environment for pier column reinforcement construction in a narrow space.The smooth implementation of the project provides references for the design and construction of similar projects.
continuous rigid-framerigidity matchingsteel frameoutsourced UHPCanti-collision wallsuspension rail system
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