How to Realize Bridge Erection for Tunnel Construction Site?

bridge girder launcher for tunnel construction
 
In order to meet the demand of bridge girder launcher and girder transporter passing through tunnels during bridge construction, Zhengzhou Huazhong Construction Machinery Co. Ltd developed THQ900t bridge girder launcher and THY900B girder carrying vehicle to solve the bridge construction problem. The cooperation of the both giant bridge construction equipment can realize the box girder erection for 32m, 24m and 20m full span and double track tunnels.
 
THQ900 bridge girder launcher for tunnel is mainly composed of main beam, cantilever beam, lower guide beam, nose girder hoist, outriggers and etc. THQ900 bridge girder launcher adopts lifting method at a fixed position. Lower guide beam is set at a high location, so that the trolley to lift bridge girders will travel from 900t girder carrying vehicle to lower guide beam. Lower guide beam will assist the bridge girder launcher to shift to next span. There are four lifting positions, in which three lifting positions can keep balance and stable. In the front and middle of the lifting mechanism, there are 4 winches in total. Separate setting of lifting trolleys will decrease the overall height and self-weight. Front and back outriggers simply support the main beam, it is convenient for operators to see current working and erecting situation clearly. Structure of outriggers adopts C shape to provide enough space for the 900t girder carrying vehicle and the girders. THQ900t bridge girder launcher can realize passing through one span to the next by small guide beam, auxiliary outrigger and self-spreader, without help from any other tool. For the bridge building at the last span of the tunnel, front cantilever and guide beam of the beam launcher can go into the tunnel directly. At the first span of the tunnel, THY900B girder carrying vehicle can transport THQ900t bridge girder launcher to their construction site and then finish erecting the first span.

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