A whole-segment erection method of exposed lattice steel girders in a steel box tie-rod arch bridge

Abstract

The invention discloses a whole-section erecting method for an open lattice type steel beam of a half-through steel box tied-arch bridge. The whole-section erecting method includes the steps that an open lattice type steel beam section and a distributing beam are prefabricated; a walking-pedrail beam erection crane is assembled on a poured concrete bridge face and backwards anchored, the open lattice type steel beam section is transported to a site, a reinforcing connecting system is installed, a first section and a second section of the open lattice type steel beam section are erected on the concrete bridge face through the walking-pedrail beam erection crane, and a suspender is installed and tensioned; the distributing beam with the walking-pedrail beam erection crane is hoisted to the erected open lattice type steel beam section; after the walking-pedrail beam erection crane is backwards anchored, the open lattice type steel beam section is hoisted, the suspender is installed, the position of the open lattice type steel beam section is adjusted, installation and welding are in place, and after the suspender is tensioned, the walking-pedrail beam erection crane is started to be forwards moved for continuous hoisting till the closure is completed. The whole-section hoisting method is carried out by combining the walking-pedrail beam erection crane with the distributing beam, the aerial welding workloads are reduced, the construction speed is high, and the safety risks are small.

Description

technical field [0001] The invention is used in the technical field of bridge construction, and in particular relates to a whole-segment erection method of an open lattice type steel girder of a mid-jacketed steel box tie-rod arch bridge. Background technique [0002] With the large-scale construction of highways and railway expressway networks in my country, a large number of bridges across rivers, rivers and seas have been built. Steel-concrete composite beams are one of the common load-bearing structures of various arch bridges, cable-stayed bridges and suspension bridges. For steel girders erected in the order of erecting steel girders first and then installing concrete bridge decks, the steel girders at this time are often open lattice structures. The general method of installation and construction of such main girders is: erect steel girders first, and then install concrete bridges panels, and finally pour the wet joints between the concrete bridge decks. Before the i...

AI Technical Summary

Problems solved by technology

[0016] In order to solve the above-mentioned problems, the present invention provides a method for erecting the whole section of open lattice steel girders of a mid-mounted steel box tied arch bridge, which solves the problem of erecting open lattice steel girders on a mid-mounted steel box tied arch bridge. The girder erected by the previous erection method has high risk of loose multiple hoisting, difficulty in design and construction of cable crane assembly and high risk, difficulty in assembly of arch crane and high safety risk, high risk of large-scale floating crane assembly channel, double bridge deck The assembly of automobile cranes needs to set up large-rigidity bridge deck support points and rear anchor structures. The existing tower crane assembly frame cranes for arch bridge triangular rigid frame construction can be used on the construction site, which can save cable cranes, arch crane tracks and The use of large temporary structural steel materials such as bridge deck support points of bridge deck truck cranes can reduce the occupation time and obstruction of the waterway, truly avoid typhoon danger and high altitude danger, and can also ensure the assembly line of steel girders to ensure safety, quality, maximizing the economy

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