Complete set of device for long helical drilling and reaming bottom and method for reaming

Abstract

The invention discloses a long auger drilling and base-expanding complete device and a reaming method. The long auger drilling and base-expanding complete device comprises a concrete filling revolving joint, an oil cylinder driving bracket, a power head, a drill rod transition joint, an inner guide pipe, an outer auger stem, a reaming tool device, a drill bit and a hydraulic system, wherein the concrete filling revolving joint comprises an elbow pipe, a core pipe, a bearing gland, a bearing, an outer body, a round nut, an oil seal and a lining ring; the elbow pipe and the core pipe are welded into a whole; the core pipe and the outer body are moveably connected by the bearing gland, the bearing, the round nut and the lining ring; the oil seal seals a bearing cavity; two upper end lug plates of the core pipe and a slide frame lug plate of the oil cylinder driving bracket are connected by bolts; the outer body is fixedly connected with the inner core of the power head by a bolt and rotates with the inner core.

Description

technical field [0001] The invention relates to the technical field of pile machinery, in particular to a complete set of device for expanding the bottom of a long helical drilling hole and a method for expanding the hole. Background technique [0002] Long auger drilling method has been used for many years. It can not only increase the end load of the pile, but also realize the anti-pull function of the pile and reduce the foundation cost of the pile. It is a very valuable form of pile foundation. Judging from the existing long auger drilling and bottom expansion devices in the domestic piling market, there are many problems, such as relatively low operating efficiency and unsatisfactory pile quality. The comprehensive problems are as follows: [0003] The driving mechanism of the reamer is unreliable. For example, some rely on the gravity of the drilling tool to open the reamer, and some use a rope to pull the reamer away. The retraction of the reamer basically depends on ...

AI Technical Summary

Problems solved by technology

Judging from the existing long auger drilling and bottom expansion devices in the domestic piling market, there are many problems, such as relatively low operating efficiency and unsatisfactory pile quality. The comprehensive problems are as follows:

[0003]The driving mechanism of the expanding tool is unreliable. The retraction of the cutter basically relies on the self-weight of the cutter and the wall of the hole to help the retraction. The size of the reaming hole of the cutter cannot be guaranteed, and the retraction of the cutter cannot be received due to the blocking soil. There are many problems and it is difficult to solve

Some hydraulic drive devices set the drive cylinder on the upper end of the drill bit. Because it takes up the space for transporting soil, it is easy to block the soil and make it impossible to cut the soil.

Some blades are not installed in the expansion section, and the empty soil in the cavity is not easy to clean

The rigidity of the expansion tool structure is poor, and it is prone to deformation and displacement, which makes the cutting performance worse

Some separate the reaming and drilling process, although the quality can be guaranteed, but it will affect the construction speed and construction cost, causing inconvenience in construction and unsatisfactory use effect.

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