Construction method for hoisting broad width steel box girder cantilever

Abstract

The invention relates to a construction method for lifting a broad width steel box girder cantilever. A cantilever lifting machine is installed on a finished bridge segment, a steel box girder to be lifted and installed is transported below the position to be installed by a girder transportation ship, and loading tentative lifting is carried out on the lifting machine by utilizing the steel box girder; the steel box girder is lifted to a bridge deck set elevation by the cantilever lifting machine, secondary tensioning is carried out on a stay cable of the finished bridge segment located by the cantilever lifting machine, and then axial-direction bridge deviation regulation, direction across bridge deviation regulation, girder segment elevation regulation and girder segment deformation regulation are carried out on the lifted steel box girder; the lifted steel box girder and the finished bridge segment are in whole section welding, hanging and first tensioning are carried out on the stay cable of the lifted girder segment, and then holding load is discharged by the cantilever lifting machine; and a next steel box girder is lifted by repeating the steps.

Description

technical field [0001] The invention relates to a method for hoisting steel box girders during bridge construction, in particular to a construction method for cantilever hoisting of wide steel box girders. Background technique [0002] In order to solve the congestion problem of urban traffic, urban planning has increased the traffic capacity of roads and bridges. At present, two-way eight-lane bridges have appeared; according to the needs of urban construction, many bridges use wide-width The steel box girder is the main light girder structure. In order to improve the service life of the bridge, the wide steel box girders adopted are all orthotropic structures. [0003] The common installation methods of steel box girders include cantilever hoisting method, jack-up method, full support floating hoisting hoisting method, etc. When the bridge spans an uninterrupted transport river, the cantilever construction method is undoubtedly an ideal method; however, for The two-way ei...

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Problems solved by technology

[0003] The common installation methods of steel box girders include cantilever hoisting method, jack-up method, full support floating hoisting hoisting method, etc. When the bridge spans an uninterrupted transport river, the cantilever construction method is undoubtedly an ideal method; however, for The two-way eight-lane wide steel box girder adopts cantilever hoisting during the construction process. Due to the large deformation of the steel box girder due to its own weight, the combination and alignment of the steel box girders is difficult. The hoisting method of forming a bridge combined with end-to-face alignment has become a key and difficult point

At present, there is no mature and reliable construction method for the cantilever hoisting of wide-width steel box girders. During the construction process, the construction is generally carried out while exploring, so it is difficult to guarantee the construction quality and construction period.

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