Construction Technology for Precasting of Built-up Box Girders Used for Hefei-Wuhan Railway

The construction of passenger dedicated railways in China is presently in full swing and the design and construction standard systems catering for the need of the construction of the railways have been accordingly promptly established.To tackle the problem of the width restriction of the precast full span box girders when transported through tunnels on the railways,the precast built-up box girders were designed and were used to substitute for the full span box girders and the standard systems for the built-up box girders were firstly released and put into application in the construction of Hefei-Wuhan Railway.The construction technology for precasting of the built-up box girders for the Railway were researched and formulated from aspect of the formwork fabrication,reinforcement binding,concrete casting and prestressing construction control for the purpose of ensuring that the construction process of the girders would be rational and orderly and the construction quality would be in the controllable state.The construction technology herewith have been widely applied in the construction of the Hubei section of the Railway and have achieved sound effect.