Mud pressure feed type horizontal directional drilling engineering geological investigation hole internal testing device

Abstract

The invention discloses a mud pressure feed type horizontal directional drilling engineering geological investigation hole internal testing device. The mud pressure feed type horizontal directional drilling engineering geological investigation hole internal testing device comprises a drilling tool, a testing device overall mechanism, a sealing pressure feed mechanism and an in-place alarm mechanism, wherein the drilling tool comprises a double-wall drill rod, and the double-wall drill rod is provided with an outer wall and an inner wall which is coaxial with the outer wall and is arranged in aspaced mode; the testing device overall mechanism is located in an inner cavity of the double-wall drill rod and comprises a center rod and a testing device body connected to the bottom end of the center rod through a bearing; the sealing pressure feed mechanism is located between the inner wall of the double-wall drill rod and the center rod; and the in-place alarm mechanism is located between the inner wall of the double-wall drill rod and the center rod, is adjacent to the sealing pressure feed mechanism and comprises a suspension seat ring fixedly connected with the inner wall of the double-wall drill rod and a valve plug connected with the suspension seat ring through a spring pin. The mud pressure feed type horizontal directional drilling engineering geological investigation hole internal testing device is simple in structure and reasonable in design, hole internal testing can be completed under the condition that a horizontal directional investigation hole is not lifted, and the mud pressure feed type horizontal directional drilling engineering geological investigation hole internal testing device integrally reaches the hole bottom for testing through a mud pressure push device.

Description

technical field [0001] The invention relates to the technical field of horizontal directional drilling engineering geological survey equipment, in particular to a mud pressure-feeding horizontal directional drilling engineering geological survey hole testing device. Background technique [0002] At present, with the development needs of engineering geological survey of mountain tunnels in high-altitude areas, engineering geological survey is not limited to vertical holes, but has been extended to horizontal directional holes. The traditional vertical hole in-hole test device cannot be directly applied to horizontal holes, and there are the following problems: [0003] (1) The test instrument is directly connected to the front end of the drill pipe, which cannot guarantee the safety of the instrument during the test; [0004] (2) Horizontal drilling generally has a long distance, and it takes a lot of time to test tripping and testing instrument drill pipe threading. [000...

AI Technical Summary

Problems solved by technology

[0003] (1) The test instrument is directly connected to the front end of the drill pipe, which cannot guarantee the safety of the instrument during the test;

[0004] (2) Horizontal drilling generally has a long distance, and it takes a lot of time to test tripping and testing instrument drill pipe threading

[0005] Therefore, it is necessary to provide a mud pressure-feeding type horizontal directional drilling engineering geological survey hole test device to solve the problem that the above-mentioned traditional vertical hole test device cannot be directly applied to horizontal holes

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