Pile forming apparatus and method for mud-jacking inner-ramming pedestal pile

Abstract

The invention provides a pile-forming device for a grouting internal-ramming pedestal pile and a pile-forming method thereof, relating to a pile-forming device and a method. The device and the method aim at solving the problems that the existing internal-ramming pile has bad side friction and anti-pulling capability, is easy to generate the necking and breaking problem and has low construction efficiency. The injection pipe of the device is fixed in an external steel plate with a sealed cavity; the bottom end of the external steel plate with the sealed cavity is fixedly provided with a lower sealing plate with a sealed cavity; the invention is provided with four methods as follows: method one: an external pipe is impacted by a hammer, meanwhile, the grout is injected into the injection pipe by a pump, with the injection pressure of 0.3-10MPa; method two: an internal pipe is impacted by a diesel hammer, a hydraulic hammer or a vibration hammer and the filling material is impacted; method three: the external pipe and a pre-fabricated pile are impacted to a design depth by the diesel hammer, the hydraulic hammer or the vibration hammer; method four: the pre-fabricated pile is impacted into the pile hole, wherein, the diameter of the external pipe is less than or equal to the maximum internal tangent round of the pre-fabricating pile. The device has high construction efficiency and is suitable for various soil qualities. The method reduces the generation of necking and breaking, and improves the bearing capability by more than 30%.

Description

Pile-forming device and pile-forming method of grouted internally rammed and expanded bottom piles technical field The invention relates to a pile forming device and a pile forming method. Background technique The currently widely used rammed pile can reduce the pile length and cost because it can make full use of the bearing layer at the pile end to increase the bearing capacity. However, with the gradual passage of application time, some deficiencies of the rammed and expanded piles have gradually emerged: 1. Because the length of the pile is too short, generally not exceeding 10 meters, the soil between the piles in this interval qsik (standard value of limit side resistance) ) is generally small, and although the soil between the piles is squeezed, the side friction and pullout resistance are still poor. Therefore, rammed and expanded piles are generally used in multi-storey buildings and less in high-rise buildings. Two, because the concrete of the pile body is poure...

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Problems solved by technology

The purpose of the present invention is to solve the problem that the side friction and pull-out resistance of the existing internal tamping piles are still relatively poor, and the concrete of the pile body is poured underground, which is easy to cause necking and broken piles, low construction efficiency, low strength of the pile itself and easy occurrence of In order to solve the problem that the outer pipe cannot sink to the design depth or pull out the outer pipe due to the pipe holding phenomenon, a pile forming device and pile forming method for grouting inner rammed and expanded bottom piles are provided

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