Open caisson construction method

Abstract

The invention discloses an open caisson construction method. The problem that an old pile foundation cannot be effectively eliminated in the deep well process in the prior art is solved. The open caisson construction method is characterized by comprising the following steps that a soil layer placed in an open caisson body on the ground surface is dug, and the open caisson body gradually sinks in the downward digging process till the top of the open caisson body is flush with the ground surface; subsequent part open caisson bodies are placed on the top of the open caisson body sunk below the ground surface, downward digging is conducted at the bottom of an open caisson continuously, and the multiple sections of open caisson bodies continuously sink to the positions under the ground to forma well wall; and when the bottom open caisson body abuts against the old pile foundation, an operation pit is dig in the bottom face of the open caisson, an obstacle removing device is arranged in theoperation pit so that the cracked part of the old pile foundation can be pushed into the soil layer on the outer side of the open caisson body, then downward digging is conducted in the bottom face of the open caisson continuously, the open caisson body sinks till the open caisson body abuts against the old pile foundation again, and the above operation is repeated. By means of the above scheme,the old pile foundation below the open caisson can be effectively removed in the open caisson process, and the open caisson process is implemented smoothly.

Description

technical field

[0001] The invention relates to the technical field of building construction methods, in particular to a caisson construction method. Background technique

[0002] The caisson is a well-shaped structure. It excavates soil in the well, relies on its own gravity or the pressure of the downward pressure equipment to overcome the frictional resistance of the well wall, and then sinks to the design elevation, and then seals the bottom with concrete and fills the well hole to make it a bridge. The foundation of an abutment or other structure. It is relatively safe and reliable in technology, with less soil excavation and less impact on adjacent buildings. The caisson foundation is buried deeply, has good stability, and can support large loads. It is generally used in the construction of foundation pits of large bridge piers, sewage pumping stations, large equipment foundations, civil air defense shelters, shield assembly wells, underground lanes and station hydrau...

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