Drill bit salvaging method and drill bit salvaging device

Abstract

The invention discloses a drill bit salvaging method and a drill bit salvaging device, and relates to the technical field of drill pile construction. A drill machine is used for lowering a drill rod,coordinates of multiple edge points of a drill bit are detected through the drill rod, and after center hole coordinates of the drill bit are determined, the drill bit salvaging device is connected with the drill rod of the drill machine through a flexible connecting device; and the drill machine is used for driving the drill bit salvaging device to move slightly in the center hole position of thedrill bit, firstly the lower end part of the drill bit salvaging device is dropped into the center hole of the drill bit, then the drill bit salvaging device is lowered, the drill bit salvaging device slides down into the center hole of the drill bit under the action of gravity, the inverted tooth structure of the drill bit salvaging device is connected with an inner thread of the center hole ofthe drill bit in a clamping mode, finally, the drill rod is lifted by using the drill machine, thus the drill bit can be salvaged timely and quickly, the problem of inclined drill bit salvaging is solved, and limitation of rigidly connected salvaging device to an inclined drill bit is overcome.

Description

technical field [0001] The invention relates to the technical field of bored pile construction, in particular to a method for fishing a drill bit and a drill bit fishing device. Background technique [0002] During the drilling process of bored piles, accidents such as the separation of the drill bit from the drill pipe and the fracture of the drill pipe body may occasionally occur, causing the drill bit to fall off to the bottom of the hole. Once the drill bit falls off, the drill bit must be salvaged in time, otherwise the hole wall will easily collapse if the hole wall is open for a long time. On the one hand, the drill bit may not be taken out and be scrapped. In severe cases, the pile foundation may even be scrapped and the design changed, which not only delays the construction period, but also causes huge economic losses. The salvage measures after the existing bored pile bit comes off mainly contain the following: [0003] 1) When the depth of the drill bit falling ...

AI Technical Summary

Problems solved by technology

This method needs to meet certain conditions and has a narrow scope of application;

[0004] 2) Use a strong magnetic fisher to suck the metal drill out of the drill hole and take it out. This method is more efficient, but limited by the power of the strong magnetic fisher, if the drill is heavy or the hole wall collapses and buries the drill, the drill cannot be taken out ;

[0005] 3) Using a mechanical overshot, the overshot head is rigidly connected to the drill pipe of the drilling rig through a flange, and the mechanical overshot head is inserted into the hole in the center of the drill bit to take out the drill bit. When the drill bit deviates due to various reasons and it is difficult to right it, it is difficult to implement this fishing method, and the soil of the hole wall will be disturbed during the righting process, which may easily cause the hole wall to collapse

[0006] In view of this, when the drill pipe breaks and the drill bit falls to the bottom of the hole, it is very difficult to use the existing salvage technology to salvage the drill bit due to the narrow drilling space, and the commonly used salvage methods have limitations

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