Cord core drilling tool for tunnel subhorizontal hole

Abstract

The invention relates to a cord core drilling tool for a tunnel subhorizontal hole, capable of improving the applicability of the cord core drilling tool in the construction of the tunnel subhorizontal hole. A cord core drilling tool product special for a subhorizontal tunnel is absent in the market at present, only individual user unit for constructing large-angle declined holes improves a ground cord core drilling tool for reluctant use, and the advantages of the cord core drilling technology are not brought into play. By designing a lug boss for fishing a spear and a composite positioning mechanism for opening a clamp and positioning a core shaft, the cord core drilling tool effectively prevents the single-sided clamping in the process of drilling the subhorizontal hole. An inner tube assembly has a sectional structure, the rapid connection and disconnection of an inner tube are realized, and the problem between shorter stroke of the drill and longer inner tube is solved. A mud pump pumps the inner tube assembly and a hydrostatic bailer for providing power for constructing the subhorizontal hole. The cord core drilling tool effectively solves the problem of the applicability ofthe cord core drilling tool during the construction of the subhorizontal hole, and improves the working efficiency of drilling operation.

Description

technical field [0001] The invention relates to a cable core drilling tool for near-horizontal holes in tunnels. Background technique [0002] Tunnel exploration can save a lot of drilling workload compared with surface exploration, and it is widely used in the field of mineral resource exploration and development. Wireline coring drilling technology has been obtained due to its advantages such as high coring rate, high drilling efficiency, and good geological effects. received widespread attention. In addition to the construction of near-vertical holes, tunnel exploration often requires drilling down-sloping holes, near-horizontal holes, and even upward holes along the bed zone. When drilling on the ground, the space is not limited, the stroke of the drilling rig can be made larger, and the length of the corresponding inner tube assembly of the drilling tool can also be longer. The length of the standard inner core tube of the drilling tool is 3000mm, and the long stroke o...

AI Technical Summary

Problems solved by technology

When drilling on the ground, the space is not limited, the stroke of the drilling rig can be made larger, and the length of the corresponding inner tube assembly of the drilling tool can also be longer. The standard inner core tube length of the drilling tool is 3000mm, and the long stroke of the drilling rig can guarantee The inner pipe assembly was put forward at one time, but when drilling in the tunnel, the stroke of the drilling rig is too short, and the inner pipe length of the cable core drilling tool used for ground drilling is too long, which is inconvenient to use in the tunnel; when constructing, use a near-vertical hole When drilling, the inner tube assembly and overshot can be freely lowered by gravity, but the inner tube assembly and overshot cannot be lowered freely when drilling near horizontal holes and upward holes in the tunnel; The device usually adopts a mechanism that relies on the tension of the tension spring to open the cartridge to realize the fixation of the inner tube assembly after it is in place and prevent the inner tube from moving upwards. When it is under the influence of its own gravity, it is easy to get stuck on one side, and the positioning function will fail.

At present, there are no special wireline core drilling tools for near-horizontal tunnels on the market. Only a few user units that construct large-angle downward slope holes have improved the ground wireline core drilling tools and used them reluctantly, and have not brought out the full potential of wireline core drilling. Advantages of technology, poor use effect

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