Stirring drill pipe internally provided with core tube

Abstract

The invention relates to a stirring drill pipe internally provided with a core tube. The stirring drill pipe comprises a hollow drill pipe provided with groups of stirring wings, an internal oil tubecombination, a grouting tube, upper and lower retainer rings and upper and lower seal rings, wherein the grouting tube is fixed in an inner cavity of the hollow drill pipe, two parallelly arranged hydraulic pipelines of the internal core tube are placed in an inner cavity of the grouting tube through a plurality of brackets, the upper end of the internal core tube is fixedly mounted in a step countersink of a male joint body through an outer joint seat and the lower end of the internal core tube is fixedly mounted in a bottom countersink of a plug of the male joint through an inner joint seat;an outer joint assembly is locked through an outer locking nut; a quick male joint is fixed through an inner locking nut; a quick female joint is fastened in an inner thread at the lower end of the first inner joint; and positioning plates are fixedly mounted between the two first outer joints and the two first inner joints, separately. According to the stirring drill pipe, the quick joints are connected accurately, so that the sealing property of pipeline connection is improved; the stirring drill pipe is convenient to operate, quick and reliable, simple to detach and easy to renovate a drill pipe grouting pipeline. The detachable stirring wings can meet construction with different drill hole diameters, so that the applicability of a drilling machine is improved.

Description

technical field [0001] The invention relates to a stirring drill rod, in particular to a stirring drill rod with a built-in core tube for a hydraulic reaming drill used for pile-planting drilling method construction. Background technique [0002] With the construction and development of foundation projects such as large-scale buildings, high-speed railways, expressways, large bridges and urban underground pipe galleries, in order to improve the bearing capacity of pile foundations, a large number of new bearing piles such as expanded bottom piles and gourd piles are used. Pile technology has the characteristics of reasonable structure, high strength of pile body material, large single pile bearing capacity, increased pullout resistance, low risk factor, short construction period and low project cost, so it is widely used in pile foundation construction. To complete the construction of the above-mentioned various bottom expansion piles and gourd piles, a large number of stati...

AI Technical Summary

Problems solved by technology

For the drill pipe used in the current hydraulic reaming drilling rig, in order to provide hydraulic power source for the built-in expansion cylinder of the reaming drilling tool, the oil inlet and return pipelines generally have the following forms and existing problems: 1) The hydraulic oil pipe set in the inner cavity of the drill pipe is suspended in the inner hole of the drill pipe. When the drill pipe needs to be added with the increase of the drilling depth, it cannot be guaranteed to be connected conveniently and quickly.

2) The hydraulic oil pipe is arranged on the outside of the drill pipe, which easily makes the structure and installation of the drill pipe more complicated, the oil pipe wears seriously, and the sealing performance is poor, which greatly reduces the efficiency of drilling rig reaming operation

This type of structural arrangement makes the connection between the oil inlet pipe, the oil return pipe and the fixed ring quite complicated, which brings great difficulties to the processing, and the manufacturing cost is high. The sealing performance of the oil return pipe, when in use, sometimes the cement slurry in the inner cavity of the drill pipe will enter the oil pipe, resulting in the failure of the reaming bit at the front end of the drill pipe, which will affect the timely opening and closing of the enlarged cutting fins at any time, greatly reducing the construction efficiency

In addition, it is also quite difficult to clean the grouting pipeline in the inner cavity of the drill pipe, and it is not easy to clean the cement slurry remaining in the pipeline, so that when such a drilling machine is used for the next construction, the quality of the drilled pile will be affected

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