Drilling and reaming dual-purpose drilling tool and construction method thereof

Abstract

The invention discloses a drilling and reaming dual-purpose drilling tool and a construction method thereof. According to the method, the rotation of a control shaft is controlled through a brake inside a diving rig, so that the power transmission from the drilling rig to the drill bit can be shunted, namely the main transmission is used for driving the drill bit to drill holes, and the secondary transmission is used for driving a reaming cutter bar to retract and ream; when the drill rig is used for drilling holes, the control shaft of the drilling rig is in a non-brake state, the conventional drilling can be performed; when the drilling rig is used for reaming, the control shaft of the drilling rig is in a brake state, and reaming can be performed; and moreover, the revolutions of the motor shaft and the control shaft is detected, the rotating state of the motor shaft and the control shaft and the vertical drilling speed are subjected to linkage control, and the transverse extension reaming and vertical drilling of the reaming cutter bar can be reamed according to a program-controlled reaming and cutting motion mode; and therefore, the drilling rig can be used for continuous drilling and reaming construction for multi-stage reaming piles containing set rotating body reaming cavities in soft soil foundation.

Description

technical field [0001] The invention relates to a pile hole forming machine tool and a forming method in geotechnical engineering, in particular to a drilling and reaming drilling tool for multi-stage reaming piles and a construction method thereof. Background technique [0002] Ordinary bored piles, the pile-forming process is: first form a cylindrical pile hole cavity by drilling in the foundation soil, then pour concrete into the hole after the steel cage is lowered, and the concrete in the pile hole solidifies to form a steel bar. Concrete piles. [0003] In order to improve the single pile bearing capacity of the cast-in-situ pile and the utilization rate of the concrete strength of the pile body, it is found that the cross section of the pile body can be enlarged locally—that is, the goal can be achieved by expanding the hole. Aiming at the problem of pile body reaming, people have invented a variety of construction methods and tools for reaming piles. The typical ...

AI Technical Summary

Problems solved by technology

However, this method of reaming is greatly affected by the geomechanical properties of the soil in the stratum. Extruding and reaming in hard soil layers will cause reaming to fail because it cannot be squeezed; The defects such as shrinkage or even hole collapse reduce the bearing capacity consistency of reaming piles

[0006] In order to solve the problems in the above-mentioned patents and technologies, the inventor proposed a patent application 01100563.7, and proposed a "Measurable and Controllable Differential Drilling and Reaming Dual-purpose Drilling Machine" in the patent 01100563.7. Technical Problems of Integrated Hole Construction

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