Combined fishing tool and fishing method for inclined percussion drill bit in deep water karst environment

Abstract

The invention discloses a combined salvage tool and a salvage method for an inclined percussion drill bit in a deep-water karst environment. The combined salvage tool is composed of a hollow hammer and a drill bit grab. The positively inclined percussion drill bit breaks the hard rock in the dissolved cavity that is stuck on the edge of the percussion drill bit; then replaces the drill bit grab and lowers it, the jaw plate of the drill grab is in an open state due to its own gravity, and the top of the percussion drill bit is squeezed Enter the drill bit grab, at this time the impact drill wire rope is lifted up, the jaw plate is forced to close and embedded in the wire rope hole on the top of the impact drill bit, so as to grab the impact drill bit and fish it out of the hole. The two tools of the present invention cooperate with each other, and the two-pronged approach has high fishing efficiency, can effectively save processing time, and has certain economic benefits. In addition, in the deep-water karst environment, salvaging the inclined percussion drill bit does not require divers to perform underwater operations and blasting operations, which can effectively avoid the occurrence of safety accidents.

Description

technical field [0001] The invention relates to a salvage tool for a drill bit, in particular to a combined salvage tool and method for an inclined impact drill bit in a deep-water karst environment. Background technique [0002] In the pile foundation engineering in karst geological environment, the impact drill is usually used for drilling construction. When the impact drill hits the karst cavity, the drill bit is prone to stuck or dropped. The traditional percussion drill bit salvage method is to use the diver diving method or the underwater blasting method, but in the complex karst geological environment, the diving salvage method and the underwater blasting method have great safety risks, and the operation depth of the diver diving and underwater blasting is not suitable. More than 60m, it is not applicable at all when the drill bit is dropped deep; or use a crane to hang the special sling and hook into the pile hole to repeatedly try to hook the impact drill bit, and t...

AI Technical Summary

Problems solved by technology

[0002] Pile foundation engineering in karst geological environment usually adopts percussion drill for drilling construction. When percussion drill impacts into karst cave, it is easy to cause drill bit sticking or drill drop accidents.

The traditional percussion drill bit salvage method is to use diver's diving salvage method or underwater blasting method, but the safety risk of diving salvage method and underwater blasting method is extremely high in complex karst geological environment, and the operating depth of diver's diving and underwater blasting is not suitable More than 60m, it is not applicable when the drill bit is deep; or use a crane to hang the special sling and hook into the pile hole and try repeatedly to hook the percussion drill bit, and then take out the percussion drill bit. The efficiency of this method is extremely low. When the pile hole is deep and the impact drill bit is tilted, it is difficult to catch the dropped impact drill bit. It is necessary to keep trying repeatedly, which will easily delay the construction period.

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