Pile-forming operation method for bidirectional agitation cement injection pile

Abstract

A piling operation method of a two-way mixing power spraying piling is realized by that two layers of positive spin mixing blades are arranged on the bit of an outside boring rod of a concentric inside and outside boring rod; two layers of reverse spin mixing blades are arranged on the bit of an inner boring rod of the concentric inside and outside boring rod. A power spraying mouth is arranged between the two layer mixing blades on the bit of the inner boring rod. The bit of the inner boring rod is arranged below the outside boring rod. In the process of the bit of the inner boring rod rotating into the earth reversely, the positive rotating blades of the bit of the outside boring rod play the function of ash pressuring and simultaneously pros and cons stirring to block the shooting passage of cement power and ensure the uniform distribution of the cement power in the piling. As a result of the positive and reverse rotating stirring, the stirring is more fully. The process includes drilling, power spraying, and stirring. In upgrading, stirring process, the rotating direction of the inside and the outside boring bits are changed, the bit of the outside boring rod is in the reversedirection, the bit of the inside boring rod is in the positive direction. Because of the functions, the piling quality is obviously improved.

Description

Technical field [0001] The invention is a method suitable for soft soil foundation treatment, relates to an operation form of using two-way mixing power and cement powder to treat soft soil foundation, and belongs to the technical field of foundation treatment methods. Background technique [0002] Soft soil foundations are often distributed in the coastal and river basins of our country. Under the dynamic action of loads, circulation, vehicles, etc., foundation settlement is the main form of foundation failure, which often leads to quality problems in highways, railways, airports, and docks. Among the various methods of soft soil foundation treatment, the most widely used method is to select composite foundation. In the reinforcement method of composite foundation, especially in the treatment of soft soil foundation in traffic engineering, the powder injection pile technology is often used for reinforcement. foundation. Engineering practice shows that the powder jet pile method...

AI Technical Summary

Problems solved by technology

[0004] (1) In the treatment of soft soil foundation, powder spraying piles generally have the problem of uneven mixing, which affects the quality of piles

[0005] (2) During the construction of powder spraying piles, there is a common phenomenon of serious ash returning, and a large amount of cement powder is sprayed out of the ground, which affects the amount of cement mixed in the pile body

[0006] (3) The construction methods of conventional powder-sprayed piles are generally: one spray and four stirs, two sprays and four stirs, or even two sprays and six stirs, which has low work efficiency

[0007] Due to the existence of the above problems, it has affected the promotion and use of powder spraying pile technology; at the same time, it has also seriously restricted the application range of powder spraying piles