Variable diameter rotary jet mixing pile

Abstract

The invention relates to a variable-diameter rotary spraying mixing pile. The mixed cement slurry is pressed into the cement slurry pipe by the mud pump, enters the faucet through the cement slurry pipe interface, and then enters the grouting steel pipe, and is sprayed out through the high-pressure spray head to realize high-pressure cutting of the soil. While the high-pressure cement slurry is cutting the soil, the variable-diameter stirring blades arranged on the outer drill pipe and the inner drill pipe realize the stirring of the soil synchronously. When the high-pressure grouting is cutting the soil while the inner and outer drill pipe stirring blades are rotating and stirring the soil, the whole high-pressure grouting mixing system, under the action of the lifting system, sinks while grouting while stirring or goes up while stirring according to the design requirements. carry. This series of actions just can complete the cement-soil cylindrical mixing pile with certain diameter. On the basis of inheriting the advantages of simple construction machinery and fast speed of the deep mixing method, the present invention combines the comprehensive advantages of high-pressure rotary spraying method with high grouting pressure, wide applicable strata and large power of three-axis stirring piles, and has a wide range of applications specialty.

Description

technical field [0001] The invention relates to a variable-diameter rotary spraying mixing pile, which can be used for treating weak foundations by cement reinforcement. Background technique [0002] The cement reinforcement method has been popularized and used for many years in my country to deal with weak foundations, and it can make the most of the in-situ foundation soil. Through a large number of engineering practices, it has been proved that the cement reinforcement method is a widely used, economical and effective foundation treatment method. At present, the main construction methods that use the principle of cement reinforcement method to treat the foundation in our country are: deep mixing method, high-pressure rotary spraying method, and three-axis mixing method. [0003] The deep mixing method uses cement, lime and other materials as the curing agent, and uses a low-pressure slurry pump (generally less than 2Mpa) to pump the solidified slurry to the depth of the ...

AI Technical Summary

Problems solved by technology

In order to make the mixing more uniform, the slurry and the soil are fully turned and mixed through the spiral blade on the mixing shaft. During this process, the cement slurry and some displaced soil clods fall into the pile hole, resulting in uneven mixing at the bottom of the pile. poor pile strength

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