Abstract:The incremental launching construction is an important construction method in bridge engineering, is often used in the case of complex construction conditions, and its construction safety is particularly important. Taking the incremental launching construction of steel box girder in Binsui Line in the East Third Ring of Harbin as an example, the overpass of this project is composed of four-layer three-dimensional transportation. The construction time is seriously limited by the railway train operation. The construction difficulty is very large. Therefore, the stress of the steel box girder and guide beam in the whole pushing process is simulated and analyzed in order to smoothly implement the project. The analysis results show that during the assembling of the second steel box girder, the tensile and compressive stresses of the guide beam and the steel box beam reach the maximum value at the same time. When the steel box girder is pushed up to the maximum cantilever in front of the push pier but not yet on the pier, the stress of the guide beam under the pushing cantilever state of each section of the steel box girder is basically unchanged. When the steel box girder is pushed on the top push pier and under the finished bridge, the guide beam has the greatest stress on the second top pushing pier. When the steel box girder is erected to the permanent support and the bridge is finished, the steel box girder has the greatest stress at the moment. The simulation results show that the maximum stress meets the specification requirements, which can ensure the safety of construction. The analysis process can provide a reference for similar projects.
