Downward drilling plugging-while-drilling type slag discharging device and method

Abstract

A downward drilling plugging-while-drilling type slag discharging device includes an upper hollow connecting rod, a lower hollow connecting rod, a sealing bearing, a sealing rubber ring, upper slag discharging ducts and lower slag discharging ducts which are all vertically connected. The upper hollow connecting rod and the lower hollow connecting rod are connected respectively with an upper port and a lower port of the bearing inner ring. The sealing rubber ring is arranged on the outer ring of the sealing bearing. Both the number of the upper slag discharging ducts and the number of the lowerslag discharging ducts are two. The two lower slag discharging ducts are assembled between the sealing rubber ring and the outer ring of the sealing bearing. The upper ends of the two lower slag discharging ducts are coaxially connected with the lower ends of the two upper slag discharging ducts correspondingly. The invention further discloses a slag discharging method of the downward drilling plugging-while-drilling type slag discharging device. According to the invention, the structure is compact, the operation is convenient, the construction method is simple, the method can ensure effective and stable slag discharge power, improve the pore-forming quality for small-diameter and large depth drilling and slag discharging effect and reduce the air pollution, and the method is innovative in small-diameter and deep drilling and slag discharging.

Description

technical field [0001] The invention belongs to the technical field of roadway (tunnel) support, and in particular relates to a downhole drilling plugging type slag discharge device and method. Background technique [0002] Drilling in coal and rock mass is an important manifestation of coal and rock cutting. According to engineering needs, the depth and direction of drilling will be different. During the construction of mine support and rock mass blasting, it is often necessary to drill holes with a depth of several meters to tens of meters and different orientations. At this time, the discharge of cuttings generated by drilling is a key factor affecting drilling efficiency. At present, the slag discharge methods in the drilling construction process at home and abroad mainly include: high-pressure water slag discharge, high-pressure air slag discharge and mechanical spiral slag discharge. However, the above slag removal methods are mainly applicable to boreholes with large...

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Problems solved by technology

For the drilling construction with small diameter and large depth in the downward direction, high-pressure water is easily affected by the drilling depth. As the drilling depth increases, the hydraulic gradient gradually decreases, and it is difficult to achieve the ideal slag discharge pressure. The spiral slag discharge method is easily affected by the integrity of the hole wall, and the slag discharge power drops sharply in the collapsed hole area, which can easily lead to hole blocking, drill sticking, drill sticking, etc., so that stable and effective slag discharge power cannot be guaranteed. In addition, the two This method of slag discharge will also cause serious air pollution

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