Construction method of large-span continuous beams adjacent to existing deep-water foundations

Abstract

The invention discloses a construction method of a large-span continuous beam closely next to an existing line deep water foundation. The large-span continuous beam to be constructed is a reinforced concrete box beam located on one side of an existing railway line, and is formed by splicing two side-span beam segments, a middle-span beam segment and two pier top beam segments. The construction method of the large-span continuous beam to be constructed comprises the steps that 1, bridge piers are constructed; 2, the pier top beam segments are constructed, specifically, pier top brackets are installed and pre-pressed, formworks are erected on the pier tops, and concrete is poured to the pier top beam segments; and 3, side-span and middle-span closure construction is carried out, specifically, after construction of the two pier top beam segments is completed, closure construction is carried out on the middle-span beam segment and the two side-span beam segments through a hanging basket. According to the method, the steps are simple, design is reasonable, construction is easy and convenient, the using effect is good, construction of the large-span continuous beam closely next to the existing line deep water foundation can be completed easily, conveniently and quickly, and the construction process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method of a large-span continuous beam adjacent to an existing deep-water foundation. Background technique [0002] At present, my country's railway bridge construction is in a period of rapid development. The use of advanced design and construction technology to achieve the goal of saving investment, shortening the construction period and ensuring safety has always been the result pursued by the engineering community. Among them, in the construction of long-span and deep-water bridges, the design theory, construction technology and equipment have reached or approached the world's advanced level. For example, in the continuous girder construction of the new second-line new Yongjiang Bridge in Nanning Railway Hub, the main span of the bridge reaches 168m, which is the largest span among single-line railway bridges in China. The construction ...

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Problems solved by technology

[0003] Although there are relatively mature construction precedents in China for the construction of double-walled steel cofferdam foundations for deep-water piers and the construction of large-span continuous beams, they are not suitable for construction of deep-water uncovered underwater bedrock and deep-water foundations, and the distance from existing business lines It is only 30m, which is relatively rare, and the continuous beam cantilevered construction with the main span of the bridge reaching 168m is still very rare in China

And in the actual construction process, due to the large span of the continuous beam, the beam surface is prone to cracking

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