Separable pier type cofferdam

Abstract

The invention relates to a separable pier type cofferdam which comprises a reinforced concrete drum and a steel drum, wherein the reinforced concrete drum and the steel drum are vertically coaxial overlapped; the reinforced concrete drum is located on the steel drum; a limiting water stop structure is arranged at the bottom of the reinforced concrete drum; the steel drum is inserted into the limiting water stop structure. When the cofferdam is used as a shore protection temporary cofferdam structure and an upper section of drum needs to be removed, a hoisting device is directly used for removing, so that the underwater operation is avoided, the operation strength is reduced, the operation time is saved, the operation cost is lowered and the working efficiency is increased. When the separable pier type cofferdam is used as a permanent structure, the reinforced concrete drum located in strong corrosive areas, such as, splash zone and water level fluctuation zone, compared with the steel drum, can effectively promote the durability of the structure and can reduce the later maintenance workload and cost.

Description

Technical field [0001] The invention relates to the technical field of pier type cofferdam structures, in particular to a separable pier type cofferdam. Background technique [0002] In recent years, with the development of offshore engineering projects, steel cylinders have been widely used as a temporary cofferdam structure or permanent structure for bank protection, but steel cylinders have two shortcomings in engineering applications: one is application in artificial islands When the temporary bank protection cofferdam is connected with the tunnel and other transportation facilities, the steel cylinder needs to be removed after the artificial island is completed. The current steel cylinder is designed as a whole, and it is difficult to pull out the entire steel cylinder after it is inserted into the soil. Lower cutting operations are difficult and costly; second, when applied to offshore pier-type permanent structures, steel cylinders have poor durability compared to reinforc...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the development of offshore engineering projects, steel cylinders have been widely used as a temporary cofferdam structure or permanent structure for revetment, but there are two deficiencies in engineering applications of steel cylinders: one is that they are used in artificial islands When the revetment temporary cofferdam is connected with traffic facilities such as tunnels, the steel cylinder needs to be dismantled after the artificial island is completed. The current steel cylinder is designed as a whole, and it is difficult to pull out the whole steel cylinder after it is inserted into the soil. The lower cutting operation is difficult and costly; second, when it is applied to the permanent structure of the offshore pier, the durability of the steel cylinder is poor compared to the reinforced concrete cylinder, especially in the highly corrosive areas such as the splash zone. It has seriously affected the service life of the structure, and the post-corrosion maintenance of the steel cylinder is difficult and costly, and the effect is not ideal

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