Method for constructing large-span and self-anchored composite beam suspension bridge girder

Abstract

The invention relates to a method for constructing a large-span and self-anchored composite beam suspension bridge girder; and the method comprises the following steps: arranging temporary piers according to needs of a pusher; finishing the construction of a steel beam through the pusher; mounting a main cable; tensioning a full-bridge sling so as to form a self-anchored suspension bridge structure; detaching all temporary piers; lifting a bridge panel by means of the bearing capacity of the main cable; and combining a cast-in-situ wet joint and the steel beam so as to form a steel-concrete composite beam; carrying out secondary dead load construction, so as to form the whole bridge. According to the invention, as a little amount of temporary piers are only needed by the steel beam pusher, the bridge panel is erected as soon as possible by means of the bearing of the main cable after a self-anchored suspension bridge structure is formed. According to the invention, the traditional method for erecting the bridge panel through the supporting of a bracket or the temporary piers is improved; temporary facility cost is reduced; good economic efficiency is obtained; as the service times of the underwater temporary piers in navigable openings are short, ship collision risk is reduced; and smooth bridge line and safe and reasonable structural stress are realized. The method for constructing the large-span and self-anchored composite beam suspension bridge girder, provided by the invention, is especially suitable for situations that navigable requirements or other barriers to be crossed are available at bridge locations during construction and the brackets and the temporary piers are inappropriately arranged with an excessive number or inappropriately arranged for a long time.

Description

technical field [0001] The invention relates to a construction method for the main girder of a large-span self-anchored composite girder suspension bridge. Background technique [0002] In the construction of composite girders of long-span self-anchored composite girder suspension bridges, steel girders are generally installed first, and then steel girders are used as supports, and concrete bridge decks are hoisted to combine with steel girders to form composite girders. In order to save the amount of steel beam material, steel beams are generally designed as flexible steel beams. In the composite beam, the concrete bridge deck usually accounts for more than 50% of the weight of the main girder. When erecting the bridge deck, it is difficult to complete the erection of the bridge deck only relying on flexible steel beams as supports. [0003] At present, the main girder construction of domestic long-span self-anchored composite girder suspension bridges basically adopts a l...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the steel girder and the bridge deck can be combined in a stress-free state. After the system is converted, the main girder bears less internal force of the constant load and the line shape is smooth; the disadvantage is that a large number of supports or temporary piers need to be laid, and the temporary piers are located on rivers or roads. Anti-collision design is required when going up, and the construction cost is high; the temporary pier is used for a long time, and the risk is high; it is not applicable when the support or temporary pier cannot be erected due to navigation requirements or other reasons

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