Advance drilling method for high-pressure water-rich filling cavity

Abstract

The invention discloses an advance drilling method for a high-pressure water-rich filling cavity, which comprises the following steps: firstly, inwards drilling by adopting a drilling machine of which drill bit diameter is 15 to 30 millimeters more than the preset borehole diameter to obtain a borehole I with the depth of 2 to 3 meters, and then withdrawing the drilling and arranging an orifice pipe in the borehole I; secondly, arranging a T-shaped drainage-proof pipe at the outer end part of the orifice pipe; and thirdly, drilling holes in the high-pressure water-rich filling cavity by adopting the drilling machine, namely during drilling, when an impacter used by the drilling machine is blocked by sand or a drill stem is exchanged, keeping the impacter smooth by adopting a mode of introducing high-pressure water into the borehole to flush the sand in the impacter. The method has the advantages of simple drilling steps, convenient operation, low construction cost and good drilling effect, and can effectively solve various actual problems in the drilling process of the prior advance drilling method for the high-pressure water-rich filling cavity.

Description

technical field [0001] The invention belongs to the technical field of advanced detection of karst tunnels, and in particular relates to an advanced drilling method for filling a karst cavity with high-pressure rich water. Background technique [0002] When conducting advanced detection of karst tunnels, advanced drilling detection is the most intuitive, effective and accurate means. However, when the traditional advance drilling method is used to drill a hole in a high-pressure water-rich filled solution cavity, it is often impossible to drill the hole due to water and mud inrush, or the filling in the high-pressure water-rich solution cavity blocks the impactor and causes drilling failure. Kong was forced to abort. [0003] In the advanced drilling detection of karst tunnels, the high-pressure air generated by the medium-high air pressure air compressor is often used to drive the coal mine hydraulic drilling rig (such as MKD-5S) or large hydraulic drilling rig (Ruyi CANSS...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an advanced drilling method for high-pressure water-rich filling of dissolved cavities, which has simple drilling steps, convenient operation, low construction cost and good drilling effect, in view of the above-mentioned deficiencies in the prior art. It can effectively solve a variety of practical problems existing in the drilling process of the existing high-pressure rich water filling solution cavity advanced drilling method

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