A non-destructive assembly and disassembly of double-layer steel casing group structure and construction method of bored pile in deep water area

Abstract

The invention relates to a construction method of an abyssal region cast-in-situ bored pile nondestructive assembly and disassembly double-layer steel casing group. The construction method sequentially comprises the steps of manufacturing and immersion construction of an outer steel casing group, drilling construction of a cast-in-situ pile, installation of an inner steel casing in place, downward placement of a reinforcement cage, filling of concrete, and disassembly of the inner steel casing and the outer steel casing group. The double-layer steel casing group comprises an integrated system of the outer steel casing group and the inner steel casing; outer steel casings are formed by winding and welding steel boards; annular brackets are welded to the inner walls of the lower ends of the outer steel casings and provided with vertical baffles; a rubber gasket is arranged inside a groove in the upper end of each bracket; the outer steel casings form the steel casing group through three steel trusses up and down. The cast-in-situ bored pile constructed by the double-layer steel casing group is high in construction quality, speed and material recycling rate under the project conditions of complex hydrologic conditions, a thin riverbed covering layer and high appearance quality of a concrete pile body in water, and good technical and economic benefits are obtained.

Description

technical field [0001] The invention relates to a construction method for non-destructive assembly and disassembly of double-layer steel casing groups for bored piles in deep water areas, which belongs to the field of pile foundation construction in bridge engineering, and is suitable for the construction of large-diameter bored piles in water, especially for complex hydrological conditions. , The construction of bored piles with thinner river bed cover and higher appearance quality of concrete piles in water. Background technique [0002] The sinking of the steel casing is a technical difficulty when carrying out pile foundation construction in river sections with complex hydrological conditions and thin river bed cover. In order to ensure the stability of the steel casing, the depth of the steel casing needs to be increased, while the cover layer The lower layer of the thinner river section is mostly hard rock formation, and it is difficult for the steel casing to enter in...

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Problems solved by technology

[0003] In view of the construction of bored piles under this construction condition, it is difficult to ensure the stability of the steel casing by using conventional steel casings for the construction of bored piles, or the project cost will be significantly increased in order to meet the stability requirements. After the strength of the pile body reaches a certain requirement, it is difficult or even impossible to pull out the conventional steel casing for recycling, and a large amount of steel is lost

[0004] In summary, although the existing bored piles have achieved certain results under similar construction conditions using conventional methods, there are still some areas for improvement

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