Salvage device and construction method of drill bit of spin dig drill

Abstract

The invention discloses a salvage device and a construction method of a drill bit of a spin dig drill. The salvage device comprises a comb-shaped rotating drill bit, a flat bamboo cutting type drill,and an anchor type drill bit; and in the comb-shaped rotating drill bit, the lower end of a first high pressure water pipe is connected with a rotating drill bit barrel body, radially distributed rotating drill bit irons nail or elastic steel wire are arranged on the inner wall or the outer wall of the rotating drill bit barrel body, the top end of the first high-pressure water pipe is connected with a drill pipe, and water outlet holes are formed in the side wall or / and bottom of the rotating drill bit barrel body. During construction, the comb-shaped rotating drill bit removes drilling slagon the drill bit of the spin dig drill, and the drill bit of the flat bamboo cutting type drill removes attachment in the drill bit of the spin dig drill; and the anchor type drill bit lifts the drillbit of the spin dig drill. According to the fishing device and the construction method of the drill bit of the spin dig drill, the drilling slag in a borehole is cleaned in the early stage by the comb-shaped rotating drill bit and the drill of the flat bamboo cutting type drill, a passage in the borehole is unobstructed, and the success rate of drill bit salvage of the spin dig drill bit is greatly increased; and the anchor type drill bit adopts an internal bracing structure, the problem of small gap between the drill bit of the spin dig drill and the inner wall of the borehole is solved, andthe success rate of salvage is significantly increased.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a rotary drilling drill bit fishing device and a construction method. Background technique [0002] Bored pile foundations are widely used in today's bridge construction process, especially under the conditions of some cross-river and urban soft ground geological environment factors, the pile foundation design is generally the bridge construction mode of bored pile foundation columns, because The pile foundation is the foundation part of the bridge construction, and the pile foundation must be driven into the bearing layer to provide a stable bearing capacity. [0003] The bearing layer of the pile foundation is a hard rock layer with a deep buried depth and stable geological conditions. When the bored pile is used for construction, due to the excessive consumption of the drill pipe, the brittle fracture of the drill pipe causes the accident that the drill bit breaks and falls...

AI Technical Summary

Problems solved by technology

In the salvage of drill pipes, manual salvage is mainly used. Usually the underwater environment is relatively harsh, the depth of the water is relatively deep, and the proportion of underwater mud is too large, there is a risk of hole collapse, the underwater vision is blurred, and the underwater working time is long , and the purpose of salvaging the drill pipe is often not achieved by launching once, and multiple launches are required, which poses a great safety risk to the launching staff

If the drill pipe is too thick due to the drilling slag and the drill bit is wrapped by the drill slag, manual labor often cannot achieve the effect of successfully salvaging the drill pipe

[0004] Chinese patent document CN101382049A has recorded a kind of salvage method of the bucket door of a rotary drilling rig, and salvages by adopting a scheme similar to a steel wire cage; but for the rotary drilling bit, the structure of the steel wire cage is difficult to be placed on the rotary drilling bit

Chinese patent document CN101382049A describes a drilling tool fishing device, which uses a structure similar to a hydraulic grab to grab the drilling tool, but the gap between the rotary drilling bit and the inner wall of the well hole (9) is small, and the grab structure It is difficult to operate, and the downhole hydraulic supply in the wellbore (9) is also difficult, and an additional hydraulic system is required

Chinese patent document CN204492730U describes a rotary drilling rig and its drilling bucket fishing device, which uses a barb structure to hook the rotary drilling bit, but the positioning of this solution is relatively difficult, and it can only be aimed at specific types of drilling buckets. And it is easy to fall off during lifting

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