Secondary bottom sealing structure of open caisson and construction method

Abstract

The invention relates to a secondary bottom sealing structure of an open caisson and a construction method. The problems that a traditional open caisson adopts the structure of one-time sinking and caisson bottom sealing, the adjusting difficulty of the sinking process is large, bottom sealing construction is complex, and the construction quality is prone to being influenced by the downhole environment are solved. The secondary bottom sealing structure comprises a shell and an inner container which are buried under the ground, the shell is in the shape of a straight cylinder with an upper opening and a lower opening, and the inner container is cylindrical; the side wall of the inner container and the inner wall of the shell are consistent in shape, and a gap is reserved between the side wall of the inner container and the inner wall of the shell; and the top of the inner container is open, a bottom plate is arranged at the bottom of the inner container, and grout is poured into the gap between the shell and the inner container and is solidified to form a consolidation layer. During construction, the construction mode that the shell is firstly sunk, the inner container is then sunk, and then consolidation is carried out is adopted. The cylindrical wall of the shell of the open caisson is thinner than the sinking wall of a common open caisson, and sinking can be controlled conveniently; steel bars are bound to the bottom of the inner container of the open caisson, concrete is poured, the inner container is sunk after mud holes are reserved, and grouting and solidification are carried out between the inner container and the shell after sinking to the bottom, so that the situation that steel bars are bound in mud and then concrete is poured is prevented, and the quality is guaranteed.

Description

technical field [0001] The invention belongs to the field of construction engineering, and relates to a caisson construction structure, in particular to a caisson secondary bottom sealing structure and a construction method. Background technique [0002] The caisson is a shaft-shaped structure. It excavates the soil in the well, relies on its own gravity to overcome the friction of the well wall and sinks to the design elevation, and then seals the bottom with concrete and fills the well hole to make it a bridge pier or other structures. Foundation. 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 hydraulic foundation construction enclosures. [0003] Traditional caissons are all one-time sinking, such as the CN 03343544A patent disclosed by the Chinese Patent Office on October 09, 2013, which is named as a ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional caisson adopts a structure of sinking once and sealing the bottom of the well, the adjustment of the sinking process is difficult, and the construction of the bottom sealing is complicated, and the construction quality is easily affected by the environment at the bottom of the well. Secondary back cover structure and construction method

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