Three-span deck type reinforced concrete continuous arch bridge dismantling method

Abstract

The invention discloses a three-span deck type reinforced concrete continuous arch bridge dismantling method which sequentially dismantles a bridge deck accessory structure, a bridge deck plate, an arch ring, a bridge pier, a bearing platform, a pile foundation and a bridge abutment of a bridge, the bridge deck plate and the arch ring are symmetrically cut into blocks, a temporary fixing support is installed, and the temporary fixing support is fixed to the top face of the bridge pier to be limited, the arch ring is prevented from generating unbalance loading or unbalance loading on the bridge pier in sequence when being dismantled and unloaded, the situation that the arch ring cracks or even collapses due to the fact that stress borne by the arch ring exceeds allowable stress is prevented, and the arch ring is prevented from being broken due to the fact that the horizontal inhaul cable is additionally arranged when the arch ring is dismantled. Construction is safer, the bridge deck slab and the arch ring are cut, dismantled and hoisted away in a blocked mode, a riverbed does not need to be salvaged and cleaned after construction is completed, the construction period is short, construction is more convenient and faster, rapid dismantling of the three-span multi-arch bridge is achieved, and the method is used for the field of bridge engineering.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a method for dismantling a three-span upper-supported reinforced concrete multi-arch bridge. Background technique [0002] In recent years, with the reconstruction and expansion of expressways and the upgrading of urban roads, some bridges that have been built have seriously affected the development and construction of expressways and urban roads; in addition, some bridges (including some concrete arch rings connected arch bridge), its maintenance cost is too high, it has no use value, and some bridge structures are built according to the abolished code, which can no longer meet the requirements of the current code, no longer have use value, need to be demolished, and then rebuilt The bridges form the expressway and urban road network system. The traditional demolition methods of concrete arch ring double-arch bridges are divided into two categories: blasting demolition method ...

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Problems solved by technology

[0003] The blasting demolition method is often used for bridges in the wild or in open places. However, the blasting demolition method has the following problems: high construction noise, high requirements for the air surface of the site, great influence by rain and temperature, flying rocks, and safety risks. And it is easy to cause harm to the surrounding buildings, and after the demolition construction is completed, it is necessary to salvage the broken objects in the river water to clean the river bed, which needs to increase the construction cost and construction period

[0004] The bridges in densely populated areas in urban areas choose mechanical demolition method more. The traditional mechanical demolition method has the following problems: it is easy to generate noise and dust, which has a great impact on the surrounding environment, and it needs to be removed under the bridge deck and arch ring. The erection of auxiliary supports requires an increase in material costs and construction period, and requires large-scale hoisting equipment, resulting in poor construction economy and safety

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