Incremental launching construction method for large, ultrahigh and small-radius circular curve steel box girder

Abstract

The invention discloses an incremental launching construction method for a large, ultrahigh and small-radius circular curve steel box girder. The incremental launching construction method comprises the following steps that walking type incremental launching equipment and a temporary bearing beam are arranged; the steel box girder is assembled according to a cross slope and a longitudinal slope which are designed according to the girder body during assembly, and the steel box girder is pushed to the temporary bearing beam on the top of an adjacent cover beam through a pushing jack on an assembly jig frame and the walking type incremental launching equipment on the top of the cover beam; curve incremental launching of the steel box girder is carried out; the deviation of the steel box girder is corrected; and incremental launching counterweight of the steel box girder is carried out, according to the segment division of the steel box girder, the walking type advancing distance of the steel box girder and the cantilever length of the steel box girder are planned, and according to the working condition calculation result of each incremental launching of the steel box girder, counterweight adjustment is carried out on the existing negative reaction force working condition and the working condition of unbalanced stress on the inner side and the outer side of the steel box girder. The purposes that the forward bending moment and torque effect of a cantilever state at the box girder end under the incremental launching state of the small-radius steel box girder is overcome, and it is guaranteed that the pressure difference between incremental launching equipment on the inner side and the incremental launching equipment on the outer side is within a certain range are achieved.

Description

technical field [0001] The present application relates to the technical field of steel box girder jacking construction, in particular, to a method for jacking construction of a steel box girder with large super height and small radius circular curve. Background technique [0002] During the jacking construction of steel box girder bridges with high piers in some mountainous areas, due to the terrain conditions of deep trenches in mountainous areas, there is no terrain condition for erecting temporary piers. High, the temporary buttress becomes soft, the horizontal rigidity is difficult to guarantee, and the resistance effectiveness of the vertical and horizontal force during the jacking process is difficult to meet the requirements; and the bridge is located on a superelevation line, the transverse and longitudinal slopes are large, and the steel box girder roof There is a risk of lateral and forward slippage when pushing. The problem caused by the small radius is that the c...

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Problems solved by technology

[0005] The main purpose of this application is to provide a method for jacking construction of large, super-high and small-radius circular curved steel box girders, so as to solve the effect of torsion and positive bending moment during the jacking construction of curved steel box girders in the related art, so that the beam body The stress becomes complicated, and the effect of torsion will produce a tendency of unilateral voiding of the front-end fulcrum or the adjacent front-end fulcrum, and due to the transverse and longitudinal slopes of the steel box girder, it cannot be constructed according to the conventional horizontal push-up method question

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