Construction method of cement mixing pile

Abstract

The invention discloses a construction method of a cement mixing pile, which comprises the following steps: 1) making a hole by squeezing soil with an immersed tube in a conventional manner or drilling a hole with long spiral equipment; 2), in the outside of the hole, mixing powder clay or powder soil with cement to make a cement mixture; 3) adding water into the mixture and mixing the mixture with a mixer to make uniform and flowable cement slurry; and 4), pouring cement slurry into a pile pipe by using conveying equipment and removing the pipe to obtain the pile, or pumping the slurry by an injection pump and pressing the slurry into the drill hole by a long spiral drill stem. The construction method of the invention has the advantages that: by mixing the powder clay and the powder soil in the outside of the hole, the soil material can be controlled and selected to make the strength of the whole pile body uniform and the quality of the pile body easily controllable and thus, the problem that the strength of the pile body made by using in-situ mixing is nonunifrom due to stratigraphic fluctuation; compared with the conventional deep mixing method, the mixing method can reduce the addition amount of cement under the condition of the same cement strength and prevents slurry waste and ground rising in a construction process; and the construction speed is high and cement of different strengths can be used according to different requirements.

Description

technical field [0001] The invention relates to a construction method of a cement-soil mixing pile, which changes in-situ mixing into outside-hole mixing, and belongs to the field of construction engineering. Background technique [0002] The traditional cement-soil mixing pile uses cement as a curing agent, sprays slurry or mist powder into the soft soil while drilling through a deep mixing machine, and mixes cement or other curing agents with the soft soil on the spot deep in the foundation. The cement, curing agent and soft soil mixed into the soft soil are fully mixed, and after a series of physical and chemical reactions, a cement-soil pile with higher compressive strength than the soil strength, integrity and water stability is formed. However, this method has the following problems: due to the different properties of each layer of foundation soil, when the amount of cement added is constant, the vertical strength of the formed pile body is uneven; Reduced body streng...

AI Technical Summary

Problems solved by technology

[0003] Therefore, in order to overcome the defects of traditional cement-soil mixing piles, the present invention provides a construction method of cement-soil mixing piles, which can avoid waste of cement and improve the strength of the pile body