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Construction method of cast-in-situ bored pile of existing underground structure

A technology of bored piles and underground structures, which is applied in foundation structure engineering, sheet pile walls, buildings, etc., and can solve problems such as speeding up construction progress, great influence on the quality of pile foundation holes, and large differences in natural floor elevations. Achieve the effect of speeding up the construction progress and avoiding safety risks

Pending Publication Date: 2022-04-22
SHANGHAI MECHANIZED CONSTR GRP
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Problems solved by technology

[0003] The purpose of the present invention is to provide a construction method for bored piles with existing underground structures, which not only avoids the safety risk of dismantling the existing underground structures, speeds up the construction progress, but also solves the problem of the existing underground structures and the natural floor elevation. The difference is large, which leads to the problem that groundwater has a great influence on the quality of pile foundation holes

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  • Construction method of cast-in-situ bored pile of existing underground structure
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  • Construction method of cast-in-situ bored pile of existing underground structure

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[0029] In order to make the purpose, advantages and features of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in very simplified form and not drawn to scale, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. In addition, the structures shown in the drawings are often a part of the actual structures. In particular, each drawing needs to display different emphases, and sometimes uses different scales.

[0030] As used herein, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. As used herein, the term "or" is generally employed in its sense including "and / or" unless the content clearly dictates otherwise. As used in the present invention, the term "several" is generally used in the mean...

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Abstract

The invention provides a cast-in-situ bored pile construction method of an existing underground structure, which comprises the following steps of: digging out covering soil on a top plate of the existing underground structure, and breaking and trepanning at a first preset piling position on the top plate; breaking and trepanning are carried out at a second preset piling position on the bottom plate of the existing underground structure; the pile hole in the bottom plate serves as a first water collecting well for pre-precipitation treatment; according to the hydrogeological condition below the bottom plate, the anti-inrush stability checking calculation is conducted on the underground confined water, the minimum mud specific gravity is determined, and mud is prepared according to the minimum mud specific gravity; and hole drilling, hole cleaning and concrete pouring are carried out. Holes are locally formed in the top plate and the bottom plate of the existing underground structure through the bearing force of the existing underground structure, and the safety risk of dismantling is avoided. And moreover, by taking a pre-precipitation measure before pile foundation construction and adjusting the specific gravity of slurry in the construction process, the problem that the difference between the elevation of the existing underground structure and the elevation of the natural terrace is large, and consequently the influence of underground water on the pile foundation pore-forming quality is large is solved.

Description

technical field [0001] The invention relates to the technical field of pile foundation engineering construction, in particular to a construction method of bored piles with existing underground structures. Background technique [0002] In recent years, with the continuous development of cities, more and more building functions cannot meet the growing urban needs. It is imperative to renovate old buildings in the city. Due to the old structures underground, the construction of pile foundation Large-scale demolition and obstacle removal construction is required. During the demolition process, safety risks are high and the progress is greatly affected. After the demolition is completed, due to the large difference in elevation between the existing underground structure and the natural floor, it is necessary to consider the overall backfilling to ensure the normal construction of the pile foundation. Increased the construction difficulty and construction cost of the old building ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/34E02D19/10
CPCE02D5/34E02D19/10
Inventor 谷凯刘轩解煜徐杰卞超武诣霖
Owner SHANGHAI MECHANIZED CONSTR GRP
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