A double-walled drilling tool for drilling and taking soil samples

Abstract

The invention belongs to drilling equipment, in particular to a double-wall drilling tool for drilling and taking soil samples. The present invention comprises a drill pipe, the upper end of which is connected with an active drill pipe through a drill pipe joint, and the upper end of the active drill pipe is connected with a faucet; the lower end of the drill pipe is connected with a drill bit; The inner pipe of the drill pipe in the outer pipe of the drill pipe, and the annular channel of the flushing fluid of the drill pipe is formed between the outer pipe of the drill pipe and the inner pipe of the drill pipe; the active drill pipe includes the outer pipe of the active drill pipe, which is fixed on the outer The inner pipe of the active drill pipe in the pipe, the outer pipe of the active drill pipe and the inner pipe of the active drill pipe form an annular channel for the active drill pipe flushing fluid; the upper part of the inner pipe of the active drill pipe is arranged with a drain from the inner wall downward to the outer wall The upper port of the air hole is also provided with a water-tight sealing gasket. The invention has the advantages of simple structure, convenient operation, little disturbance to soil samples during drilling and sampling, and high efficiency of soil sampling.

Description

technical field [0001] The invention belongs to drilling equipment, in particular to a double-wall drilling tool for drilling and taking soil samples. Background technique [0002] Drilling is an important means for geological exploration to obtain physical geological data. Drilling requires not only improving drilling efficiency, but more importantly, ensuring the quality of samples taken. The quality of these samples directly affects engineering geological surveys, geological structure judgments, and mineral resources. Accuracy and reliability of appraisals, hydrogeological surveys, and submissions of mineral reserves. Therefore, how to obtain complete, accurate and reliable physical geological data from the borehole is one of the key technologies of the drilling work. [0003] The main task of engineering geological drilling is to take core or undisturbed soil samples in the rock and soil layer. It mainly drills into the surface soil layer and has special sampling requir...

AI Technical Summary

Problems solved by technology

There are two main types of rotary soil fetchers: single-action double-pipe soil fetcher and double-action double-pipe soil fetcher. The structure of these two soil fetching pipes is more complicated and inconvenient to operate

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