Construction method of a reinforced concrete arch bridge

Abstract

The invention provides a construction method of a reinforced concrete arch bridge and belongs to the technical field of bridge construction. The construction method comprises the following steps of (1) assembling of an arch frame, (2) prepressing of an arch ring and the arch frame, (3) laying of arch ring formworks, (4) binding of steel bars, (5) concrete segmented pouring construction and (6) unloading and removing of the arch frame. According to the construction method of the reinforced concrete arch bridge, aiming at the problem that as for bridges in deeply mountains, full space supports cannot be erected for arch ring concrete cast-in-situ construction due to the terrain limitation, the construction technology that the non-supporting-pier 64-type military beam assembling arch frame iscombined with sand cylinders for unloading and frame removing is adopted, and the construction method has the advantages of less investment, short construction period, high operability, high standardized degree and the like; and based on the principle that the engineering requirements can be met and the economical and applicable principles, the adopted construction method is simple and flexible,and significant economic and social benefits can be achieved.

Description

【Technical field】 [0001] The invention relates to the technical field of bridge construction, in particular to a construction method of a reinforced concrete arch bridge. 【Background technique】 [0002] Arch bridge is a common bridge structure with a long history of development. It is widely used in various bridge projects because of its beautiful line shape, good mechanical performance and excellent spanning ability. Especially under the background of the country's implementation of the western development, a large number of infrastructure such as highways and high-speed railways have been built. More and more arch bridges are favored by engineers and owners as spanning structures, and they have been successfully applied to actual projects and achieved good results. economic and social benefits. The construction of reinforced concrete arch rings is generally divided into two types: prefabricated installation and cast-in-place erection. [0003] When the reinforced concret...

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Problems solved by technology

In the construction of bridges in mountainous areas, there are the following problems: 1. Due to the limitations of local construction technical conditions, human resources, mechanical equipment and site terrain, bridges located in deep mountains and canyons cannot be erected with full support for arch ring concrete cast-in-situ construction due to terrain constraints ;2. When the arch ring is poured, it is easy to cause abnormal deformation of the support, damage the axis of the main arch, and even cause concrete cracks; 3. The inconvenient transportation in mountainous areas makes it difficult to maintain the bridge in the later stage. Therefore, the quality of the bridge is high. Strict control, especially the maintenance in the initial stage after concrete pouring is very important; 4. During the demolition process of the arch frame, if the sand cylinder is not evenly discharged, the support will suddenly sink, and it is easy to cause the support to sink too high in mountainous areas with difficult terrain. lead to major safety hazards

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