A Construction Technology of Pneumatic Down-the-hole Hammer Reverse Circulation Slagging for Rotary Drilling Rig

Abstract

The invention discloses a pneumatic DTH hammer reverse circulation slagging construction process for a rotary drilling rig. According to the pneumatic DTH hammer reverse circulation slagging construction process, a direct circulation DTH hammer is arranged on the rotary drilling rig; mud is utilized to protect the wall of a hole; a water faucet used for slagging and providing a gas source for a drill pipe and the DTH hammer, and a direct and reverse circulation conversion device used for removing slag generated by the drilling of the direct circulation DTH hammer through utilizing a reverse circulation work method are additionally arranged in an overall transmission work device; the water faucet is installed at the upper end of the drill pipe; the direct and reverse circulation conversion device is installed between the drill pipe and the direct circulation DTH hammer; and with a reverse circulation construction process adopted, gas lifting is utilized to suck and circulate the wall protecting mud and carry the slag, so that the slag can be discharged from the hole along the inner cavity of the direct and reverse circulation conversion device, the inner cavity of the drill pipe and the slag discharge pipeline of the water faucet; the direct circulation DTH hammer can be utilized to realize the reverse circulation slagging construction process; the mud is adopted to protect the wall of the hole, and therefore, construction cost can be greatly reduced, and pollution and damage to the environment can be reduced.

Description

technical field [0001] The invention relates to a construction process for a rotary drilling rig, in particular to a reverse cycle slag discharge construction process for a pneumatic down-the-hole hammer used for a rotary drilling rig, and belongs to the technical field of rotary drilling rigs. Background technique [0002] At present, when the rotary drilling rig is drilling in hard rock formation, in order to improve the construction efficiency, a pneumatic down-the-hole hammer working device can be equipped on the machine body. The pneumatic down-the-hole hammer mainly blows out the broken rock debris through the residual air of high-pressure air. Construction outside the hole. Existing down-the-hole hammers are divided into positive circulation down-the-hole hammers and reverse circulation down-the-hole hammers. Generally, the positive circulation down-the-hole hammers use the positive circulation construction technology, and the reverse circulation down-the-hole hammers...

AI Technical Summary

Problems solved by technology

However, if a positive circulation DTH hammer is used, the positive circulation construction process will naturally be adopted for construction. In order to prevent the hole from collapsing, a full casing casing must be installed to follow up the construction. This not only increases the cost, but also the slag is not easy to collect , the environment is more polluted

On the contrary, if reverse circulation construction technology is used for slag discharge, the slag can be collected in a concentrated manner. At the same time, through structural design, the construction of the whole casing can be reduced, the construction cost can be reduced, and the problems caused by the positive circulation construction technology can be solved, but At present, there is no precedent for using the positive circulation DTH hammer to implement the reverse circulation construction technology. Therefore, how to realize the reverse circulation construction method through the positive circulation DTH hammer when constructing large apertures is a major difficulty in the pile engineering industry.

Images