Positive-circulation drilling and dedusting technique of chamber down-hole hammer and double-wall pipe

A technology of down-the-hole hammer and double-wall pipe, which is applied to drilling equipment, earthwork drilling, and driving devices for drilling in boreholes.

Inactive Publication Date: 2010-10-20
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, lubricants and foaming agents need to be added in water, which increases the construction cost; foaming agents injected with compressed air will obviously reduce the drilling time of the DTH hammer

Method used

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  • Positive-circulation drilling and dedusting technique of chamber down-hole hammer and double-wall pipe
  • Positive-circulation drilling and dedusting technique of chamber down-hole hammer and double-wall pipe
  • Positive-circulation drilling and dedusting technique of chamber down-hole hammer and double-wall pipe

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Experimental program
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Effect test

Embodiment Construction

[0016] This design consists of the following parts:

[0017] Rotator 1, water supply box 2, double wall pipe 3, joint 6, joint 7, down-the-hole hammer 8, drill bit 9

[0018] When working, the compressed air is transmitted to the down-the-hole hammer (8) through the central channel (5) of the double-wall pipe, so that the gas drives the piston to reciprocate, and impacts the drill bit (9) for rock drilling; the exhaust gas is discharged through the exhaust hole of the drill bit (9) , flush the bottom of the hole, cool the drill bit (9), carry cuttings back along the gap between the hole wall and the down-the-hole hammer (8), and meet the annular gap between the water box (2) and the double-wall pipe (3) (4) In the water mist area sprayed by the conversion joint (6) (7), the exhaust gas carries the rock dust and mixes in the water mist area, and the multiphase flow of water, gas and rock slag formed runs along the double-walled pipe and the hole wall. The annular gap discharge...

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Abstract

The invention relates to a positive-circulation drilling and dedusting technique of a chamber down-hole hammer and a double-wall pipe, which is specially used for a positive-circulation drilling and dedusting method of combination of an ordinary down-hole hammer and a double-wall pipe. The dedusting portion is realized by three parts, i.e. a water delivering box, a double-wall pipe and a water injection conversion joint. Compared with other chamber injected hole drilling dedusting methods, the dedusting method has simple and reliable structure and favorable dedusting efficiency and does not affect the impact drilling efficiency of ordinary down-hole hammers. When the hammer head of the down-hole hammer is drilled, water with a certain pressure is fed to an annular gap of the double-wall pipe through a water box; water enters in the water injection conversion joint through the annular gap; pressure water is sprayed from holes circumferentially arranged on the water injection conversion joint to form a water spray area; waste gas carries rock powder to mix in the water spray area; and the formed multiphase flow of water, gas and rock slag is discharged outside through the annular gap between the double-wall pipe and the hole wall to realize positive-circulation drilling wet-type dedusting of ordinary down-hole hammers.

Description

technical field [0001] The invention relates to a cavern down-the-hole hammer double-wall pipe positive circulation drilling dust removal technology, which can achieve the effect of dust removal in the hole without affecting the rock drilling efficiency. It can be applied to the construction of grouting holes in caverns, geological drilling, and mining to reduce or eliminate the hazards of dust to human health and machine performance during drilling. Background technique [0002] The traditional method of down-the-hole hammer is positive circulation drilling. When drilling, the airflow discharged from the hole carries slag chips and is ejected from the orifice. The dust is diffuse, endangering the health of workers, polluting the construction environment, and affecting the service life of the machine. Therefore, the choice of dust removal method is particularly important. [0003] At present, the dust removal technology methods in the drilling process of pneumatic down-the-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B4/06
Inventor 卜长根韦旌坤曾辉
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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