A construction method for the main girder of a steel-concrete composite girder cable-stayed bridge

Abstract

The invention discloses a construction method for the main girder of a steel-concrete composite girder cable-stayed bridge. The bridge deck crane is placed on the steel girder of the initial section, the hoisting unit of the first deck crane splices the steel beam of the section and is fixed on both ends of the steel beam of the initial section, and the first deck crane moves forward to one end of the steel beam of the initial section On the steel girder of the unit splicing section, the second deck crane is hoisted by the wall-attached crane to the steel girder of the unit splicing section at the other end of the initial section steel girder, and the first deck crane and the second deck crane respectively Move and complete the splicing construction of steel beams extending towards the side span of the bridge and the splicing construction of steel beams extending towards the middle span of the bridge, and complete the closing construction of the side span steel beams and the closing construction of the middle span steel beams. The invention has the advantages of strong operability, safety and reliability, controllable quality, high efficiency, energy saving and environmental protection.

Description

technical field [0001] The invention relates to the technical field of bridge construction equipment, in particular to a construction method for the main girder of a steel-concrete composite girder cable-stayed bridge. Background technique [0002] At present, the steel girders of combined girder cable-stayed bridges are generally pre-assembled on site after leaving the factory, and the installation adopts the overall hoisting or loose assembly process. After the installation and tensioning of the concrete bridge deck is completed, move forward to enter the next stage of construction. For the limited parts of the site, there is not enough pre-assembled space, and it is difficult to implement on-site pre-assembled; the overall hoisting can only be implemented when there is a better site under the bridge. For crossing unnavigable rivers, valleys, railways, highways and In environments such as bridges, it is difficult to implement the overall hoisting process; for special cabl...

AI Technical Summary

Problems solved by technology

For the limited parts of the site, there is not enough pre-assembled space, and it is difficult to implement on-site pre-assembled; the overall hoisting can only be implemented when there is a better site under the bridge. For crossing unnavigable rivers, valleys, railways, highways and In environments such as bridges, it is difficult to implement the overall hoisting process; for special cable tower structures, it is also difficult to deploy truss cranes, and at the same time, there is no suitable equipment for hoisting and installation combined with beam brackets and bridge deck cranes; Parts, transportation and installation on the beam, the limitation of the hoisting work surface, affect the work efficiency; after the installation of the steel girder and the bridge deck in the previous section and the pouring of the wet joints are completed, the wet joints are under strong tension, and the bridge deck crane moves forward, and then For the installation of the next section, for seasons with low temperature or large temperature difference, the wet joints cannot be constructed normally, which greatly affects the installation efficiency of the main girder. Wet joints will have tensile stress, even cracks, cracks, etc., and the entire construction requires a long construction period, which has a great impact on the installation quality and overall construction period of the combined beam

In addition, there is a method of delaying the pouring of wet joints, which can stagger the construction of wet joints and the installation of the main girder simultaneously, but the deck crane of this method will generate relatively large compressive stress on the concrete bridge deck and tensile stress on the steel girder , which is detrimental to the structural quality

From the above content, it can be seen that the installation of the main girder of the traditional composite girder cable-stayed bridge has high requirements for the construction site, high requirements for lifting equipment, high construction energy consumption, limited work area for scattered construction, large influence of climate factors, unfavorable stress on the main structure, and poor construction efficiency. Disadvantages such as long cycle

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