Steel box girder lifting structure and lifting method of large-span combined beam

Abstract

The invention discloses a large-span composite beam steel box girder lifting structure and method. The lifting structure comprises a portal lifting frame and a reinforced concrete box girder arranged on a bridge in the extending direction of the bridge. The portal lifting frame comprises a cross beam and two supporting columns. A lifting trolley is arranged on the cross beam. The upper ends of the two supporting columns are used for supporting the two ends of the cross beam. The lower end of each supporting column is provided with a moving trolley. The upper ends of the two supporting columns are flush. The lower ends of the two supporting columns have a height difference, and the higher supporting column and the lower supporting column are formed. The moving trolley at the lower end of the higher supporting column is arranged on the upper surface of the reinforced concrete box girder. The moving trolley at the lower end of the lower supporting column is arranged on the ground. The large-span composite beam steel box girder lifting structure is combined with the lifting method. The cast-in-situ reinforced concrete box girder serves as the track laying surface of the moving trolley of the higher supporting column of the portal lifting frame. The width of the occupied area of the portal lifting frame is reduced. The leveling cost of a roadbed during track laying is saved. The economic performance is good.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a steel box girder hoisting structure and a hoisting method of a large-span combined girder. Background technique [0002] With the rapid and steady growth of the country's economic construction and the vigorous development of infrastructure construction, the number of long-span bridges has been continuously increased in recent years. At present, the combined beam composed of steel box girder and reinforced concrete box girder can obtain more superior structural mechanical properties and reasonable structural form. The tension area has good tensile strength and deformation capacity, but it is easy to yield in the compression area, and the reinforced concrete members are really good. On the contrary, the compressive strength is high, and the weight of pure steel members is lighter than that of pure reinforced concrete members, but the cost of reinforced c...

AI Technical Summary

Problems solved by technology

In the process of bridge construction, for example, in poor or complex terrain conditions such as narrow urban spaces and mountainous areas, there may not be enough space to set up conventional gantry lifting frames to lift long-span steel box girders. At this time, it is difficult to lift long-span steel box girders

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