Construction method for cropping bridge pile foundation at sandy gravel stratum of abyssal region

Abstract

The invention discloses a construction method for cropping a bridge pile foundation at a sandy gravel stratum of an abyssal region. A passive underpinning principle is adopted; firstly, an enclosing structure is constructed behind an existing bridge abutment by a certain distance, and a temporary cofferdam is constructed in a river, so that operation space is provided; an underpinning pile foundation and an underpinning bearing table are constructed in the enclosing structure, and dead loads of an existing bridge is transferred to an underpinning pile and the underpinning bearing table; and a pile breaking channel is dug below the underpinning bearing table, and the pile is finally removed with a manual hole digging method. According to the method, on the premise that the construction quality is guaranteed, the construction schedule can be quickened, the manufacturing cost is reduced, and influences of underpinning construction on existing buildings, pipes and ground transportation are reduced; and the construction method has the technical advancement and has social benefits and economic benefits.

Description

technical field [0001] The invention belongs to the field of bridge construction, and in particular relates to a construction method for cutting bridge pile foundations in sand and pebble strata in deep water areas. Background technique [0002] With the rapid development of my country's economy and the continuous improvement of underground engineering construction technology at home and abroad, the number and scale of urban underground engineering have reached a very high level. In order to strengthen inter-city traffic connections, especially in cities divided by rivers, lakes, and shallow seas, bridges were mainly used to connect various administrative areas in the city. With the advancement of underground engineering excavation technology and the development of mechanized equipment, major Cities began to use the shield method to construct tunnels across rivers or seas. When constructing shield tunnels in these waters, it is often encountered that the bridge pile foundat...

AI Technical Summary

Problems solved by technology

The above method is not only time-consuming and labor-intensive, but also very expensive

At the same time, this method is often subject to many restrictions for important areas where traffic cannot be affected, or when it is impossible to create another space to build temporary bridges

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