Long cone pile and construction design method thereof

Abstract

The invention relates to the technical field of foundation engineering, in particular to a long cone pile which comprises three or more pile bodies with different diameters of cross sections, and thediameter of the cross section of an upper pile body is larger than that of the cross section of a lower pile body, so that the whole long cone pile is of an inverted cone structure from top to bottom.The invention further provides a construction design method of the long cone pile. The long cone pile of the inverted cone structure is obtained through design. In the hole forming process of the long cone pile, the downward compaction effect is achieved, and the longer the pile length is, the denser the soil at the pile end is, the better the compaction effect is, and the higher the bearing capacity is. The replacement rate is high, the total number of piles is small, and pile body materials are saved in number. Compared with a traditional CFG pile, the single pile body is conical and smallin size, pile body materials are saved from the single pile body, and about 20% of materials can be saved from the single pile body.

Description

technical field [0001] The invention relates to the technical field of foundation engineering, in particular to a long vertebral pile and its construction design [0002] method. Background technique [0003] The vertical force of the pile is generally transmitted downward from the pile top to the pile tip. The pile top is the largest and the pile terminal is the smallest. Some pile tips are almost zero in vertical stress. , to control the amount of settlement under force, even if the stress is small, it must satisfy a certain length. [0004] However, as the downward extension of the pile body becomes longer, the vertical stress attenuation becomes smaller. The pile bodies in the prior art are all about the same size up and down. In theory, the pile body that only considers the vertical stress should be designed according to the stress size to achieve best. In fact, there is basically no change in the pile body regardless of the specification and actual design and constr...

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Problems solved by technology

[0004] However, as the downward extension of the pile body becomes longer, the vertical stress attenuation becomes smaller. The pile bodies in the prior art are all about the same size up and down. In theory, the pile body that only considers the vertical stress should be designed according to the stress size to achieve best

In fact, there is basically no change in the pile body regardless of the specification and actual design and construction, resulting in a lot of waste of pile body materials, especially the most widely used method in foundation treatment is the CFG composite foundation treatment method.

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