Method for erecting large-span lower chord variable truss high continuous steel trussed beam cantilever

Abstract

The invention discloses a method for erecting a large-span lower chord variable truss high continuous steel trussed beam cantilever. Temporary buttresses are adopted in side-span steel beams to assist in semi-cantilever splicing and erection, and main-span full cantilever erection is conducted. The method specifically includes the steps that steel beam lifting stations are arranged at the positions of abutment piers, the temporary buttresses are arranged at the positions of corresponding joints of the side-span steel beams according to the main truss structure stress, the beams are lifted through the lifting stations and transported through a bridge floor, and an upper chord beam erection crane is used for erecting the steel beams joint by joint from the side span to the main span; and in the midspan closure process, the down-warping and the turning angle of the front end of a closure opening are adjusted through an abutment pier beam rising and falling method, and in combination with measures of longitudinal jacking and pulling of the steel beams and the like, the steel beams are closed with the high accuracy. By the adoption of the method for erecting the large-span variable truss high continuous steel trussed beam cantilever, the construction problem of striding over a river without a large-tonnage ship navigation condition and with a navigation requirement is solved.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a cantilever erection method of a continuous steel truss girder with variable chord height and large span. Background technique [0002] As a structural type of long-span bridges, continuous steel truss bridges have the advantages of large spanning capacity, clear structural stress, novel design, and beautiful architectural shapes. They are often used in bridges spanning highways, railways, and long-span rivers. . At present, the construction methods of long-span continuous steel truss girder bridges are mostly two-way symmetrical cantilever assembly from the middle main pier, and with the help of external facilities such as suspension towers or mid-span temporary piers, the mid-span closing method is realized. According to its structural characteristics , environmental factors, boundary conditions, selection of construction auxiliary facilities and insta...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a construction method for a continuous steel truss girder bridge with variable truss height and lower chord, which realizes cantilever erection on the river bank and bridge deck transportation, and solves the problem of crossing rivers that do not have navigation conditions for large-tonnage ships and have navigation requirements. construction problems

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