Cross-section-variable drilling tool for cement mixing pile

Abstract

The invention relates to a cross-section-variable drilling tool for a cement mixing pile. The cross-section-variable drilling tool comprises an outer drill rod and an inner drill rod which are concentrically and coaxially arranged, a conveying pipe is arranged in the inner drill rod, outer drill rod blades are arranged on the lower portion of the outer drill rod, a spraying rod is connected to theend of the inner drill rod through a flange board, an inner drill bit is connected to the lower portion of the spraying rod through a flange board, a jet pipe is installed on the upper portion of thespraying rod, inner drill rod blades are installed on the lower portion of the spraying rod, one end of the jet pipe is hermetically connected with a conveying pipe for conveying a jet medium, jet orifices are formed in the other two ends of the jet pipe respectively, each of the outer drill rod blades and the inner drill rod blades comprises a fixed blade and a movable blade, the movable bladesare slidably connected with the outer drill rod blades, the other ends of the movable blades are connected with a hydraulic cylinder, the hydraulic cylinder is fixedly installed at one end, close to the inner wall of the outer drill rod or the spraying rod, of the fixed blade or directly installed on the spraying rod. The cross-section-variable drilling tool has the advantages of being simple in reducing structure, good in sealing performance, easy to control, high in adaptability and convenient to replace and clean.

Description

technical field [0001] The invention belongs to the field of deep soft foundation treatment equipment, and in particular relates to a variable-section drilling tool for cement mixing piles. Background technique [0002] Cement mixing pile refers to an effective form of soft foundation treatment. It is a main agent that uses cement as a curing agent. The cement is sprayed into the soil by a mixing pile machine and fully stirred to make a series of physical and chemical reactions between the cement and the soil. , to harden the soft soil and improve the strength of the foundation. [0003] Conventional columnar cement mixing piles have the problems of poor uniformity, upward grout, unreasonable force and low economic benefits. [0004] The nail-type two-way cement mixing pile is a new type of mixing pile, which has the characteristics of stable structure and good reinforcement effect. The inner and outer two sets of mixing blades rotate forward and reverse at the same time, ...

AI Technical Summary

Problems solved by technology

[0005] However, the equipment of the current nail-shaped two-way cement mixing piles is expensive, the structure is complex, and there is no single way to realize the variable section of the pile body, which cannot meet the needs of different diameters of the pile body. In addition, there are also problems with poor sealing and difficult replacement. And other issues

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