Sleeve drill pipe drilling tool and construction method for pulling out old pile by using drilling tool

Abstract

The invention relates to a sleeve drill pipe drilling tool. The sleeve drill pipe drilling tool comprises a transition connector connected to a drilling machine, an unearthing hole is formed in the side wall of the lower end of the transition connector, a sleeve drill pipe fitting is detachably connected to the lower portion of the transition connector, and a drill bit is detachably connected to the lower portion of the sleeve drill pipe fitting; the sleeve drill pipe fitting comprises a plurality of sections of cylindrical sleeve drill pipes which communicate with one another, spiral blades are arranged on the inner wall and the outer wall of each section of sleeve drill pipe respectively, and a material hole is formed in the side wall of the lower end of each section of sleeve drill pipe; and a plurality of groups of soil scrapers are annularly arranged on the inner wall of the lower end of each section of sleeve drill pipe. The invention further relates to a construction method for pulling out an old pile through the sleeve drill pipe drilling tool. According to different old pile types, the drill bits and the soil scrapers which are matched with each other are selected, a pile body and a soil body can be rapidly and well separated, and efficient, convenient and stable old pile pulling-out operation is achieved.

Description

technical field [0001] The invention relates to the technical field of construction of old building piles, in particular to a casing drill pipe drilling tool and a construction method for pulling out old piles by using the drilling tool. Background technique [0002] With the vigorous development of urbanization in our country, the transformation of old cities and the reconstruction and expansion of buildings have been born. Old city reconstruction and building reconstruction and expansion usually involve the demolition of old buildings and reconstruction of high-rise buildings. For soft soil areas or bad soil areas, old building foundations mostly use pile foundations. When pile foundations are used for new building foundations in this area, the construction of new pile foundations will be affected by old building pile foundations. Therefore, how to eliminate the influence of the old pile foundation on the construction of the new building pile foundation is an urgent prob...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problems of poor construction effect and low efficiency of removing old pile foundations in the existing isolation and pulling tools, the present invention provides a drilling tool with casing and a construction method for removing old piles by using the drilling tool, which can realize the separation of old pile foundations and surrounding soil. Good separation, less disturbance to the surrounding soil, flexible and convenient construction, high construction efficiency

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