Construction method of auxiliary jacking of large-span steel box girder suspension cable tower

Abstract

The invention discloses a construction method of an auxiliary jacking of a large-span steel box girder suspension cable tower, and belongs to a large-span bridge construction method. The construction method comprises the following steps that step A, assembly platform piers, middle piers and end piers are arranged in the construction area, assembly brackets are assembled between the assembly platform piers, and a sideway girder is arranged on the assembly brackets; and step B, a nose girder is assembled on the assembly brackets, a first assembling section of a steel box girder is continuously assembled at the back end of the nose girder, and a jacking sliding block is mounted at the tail end of the steel box girder. According to the construction method, by arranging the suspension cable tower and the nose girder auxiliary jacking, deflection and stress of the steel box girder caused by a large hogging moment of large-span steel girder jacking cantilever are reduced; by designing multi layers of suspenders on the suspension cable tower, the structural stress and linear changes of the steel box girder meet the design requirements in the construction process; by arranging jacking devices and cushioning with sliding cushion blocks, the elevation multiple adjustment method is realized, and the linear changes of the steel girder in the jacking process are solved; and adjustable guide is designed, and a corrective device is adapted to the linear changes of the steel box girder.

Description

technical field [0001] The invention relates to a construction method of a long-span bridge, and more specifically, the invention mainly relates to a construction method for auxiliary jacking of a large-span steel box girder suspension cable tower. Background technique [0002] Steel box girder jacking construction has been more and more widely used due to its low construction cost, fast construction speed, good construction stability, strong controllability of construction period, and no need to interrupt the traffic under the bridge during construction. It is especially suitable for Suitable for bridges across busy traffic roads and shipping rivers. However, with the development of my country's bridge industry, due to the influence of terrain and the diversification of design forms, some steel box girder bridges have large spans, and temporary piers cannot be set in the middle of the span due to traffic or geological and hydrological conditions. . This kind of steel box g...

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Problems solved by technology

[0003] One of the purposes of the present invention is to address the above-mentioned deficiencies and provide a large-span steel box girder sling tower assisted jacking construction method, in order to expect that due to the large span of steel box girder bridges in the prior art, it is impossible to install them in the middle of the span. Temporary piers, during the construction of steel box girders, technical problems such as bridge alignment control, fulcrum reaction force control, and steel box girder's own stress are difficult to control

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