Reaming guide device for core drilling

Abstract

The utility model discloses a core drilling reaming guide device, which comprises a guide rod and a core tube, and further comprises an inner tube and a coring drill rod in threaded connection with the core tube, the inner tube is positioned in the core tube, and the inner tube and the core tube are connected together through an elastic clamping structure; the inner pipe is provided with a rope used for taking the inner pipe out of the rock core pipe, the maximum outer diameter of the guide rod is smaller than the inner diameter of the coring drill rod and the inner diameter of the rock core pipe, the top end of the guide rod is provided with a threaded connection portion used for being connected with the inner pipe, and a reamer bit of the guide rod is located outside the coring drill rod. Structural connection is stable, chambering and coring are integrated, the guide rod is taken out conveniently, and time is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of hole enlargement, in particular to a core drilling hole enlargement guide device. Background Art

[0002] In geological core drilling construction, common problems such as borehole leakage, hole wall collapse, cave fissures or other technical factors make it impossible for mud technology to protect the wall, resulting in the inability to continue drilling. It is necessary to expand the hole and install casing to ensure normal drilling work.

[0003] The common method of hole expansion guidance is: first insert a guide rod with a smaller diameter than the core tube into the core tube, and then use a pin to pass through the guide rod and the core tube to fix it. Since the pin is prone to breakage during the hole expansion process, the guide rod will fall and cause complex accidents in the hole; in addition, after the hole expansion is completed, in order to ensure that the drilled core enters the core tube, the entire drilling structure needs to be removed from the underground hole before the guide rod can be removed, but it takes a long time to pull out and re-drill, which affects work efficiency. Utility Model Content

[0004] The utility model aims to solve the technical problems existing in the prior art, and particularly innovatively proposes a core drilling reaming guide device, which has a stable structural connection, integrates reaming and coring, is convenient to take out the guide rod, and saves time.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a core drilling reaming guide device, including a guide rod and a core tube, and also including an inner tube and a coring drill rod threadedly connected to the core tube, the inner tube is located in the core tube and connected together by a spring-clip structure; the inner tube is equipped with a rope for removing the inner tube from the core tube, the maximum outer diameter of the guide rod is smaller than the inner diameters of the coring drill rod and the core tube, the top end of the guide rod is provided with a threaded connection portion for connecting to the inner tube, and the reaming drill bit of the guide rod is located outside the coring drill rod.

[0006] In the above solution: an extension piece is arranged on the top of the guide rod, and the threaded connection part is arranged on the top of the extension piece to ensure the installation position of the guide rod.

[0007] In the above scheme: the extension piece is a retaining spring seat, which directly adopts the retaining spring seat commonly found at the coring site, can be obtained from anywhere, and is easy to assemble.

[0008] In the above solution: the extension piece and the guide rod are detachably connected together, which is convenient for removing or replacing the extension piece.

[0009] In summary, the beneficial effects of the utility model are: the guide rod can be directly taken out of the core tube through the inner tube and the rope, without the need to extract the coring drill rod and the core tube, thus saving time. The guide rod is threadedly connected to the inner tube, which is stable to install and will not cause complicated accidents in the hole where the guide rod falls. The disassembly is convenient, and the threaded connection is convenient to disassemble, which facilitates the subsequent connection of the inner tube with other components. The coring drill rod and inner tube involved are common equipment on site, which can save costs and do not require the purchase of other equipment. It is only necessary to set a threaded connection part at the top of the guide rod, which is simple and convenient to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional view of the utility model. DETAILED DESCRIPTION

[0011] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0012] like Figure 1 As shown, a core drilling and hole enlarging guide device comprises a guide rod 1, a core tube 3, a coring drill rod 2 and an inner tube 4. The coring drill rod 2 is threadedly connected to the core tube 3, and the inner tube 4 is located in the core tube 3 and connected together by a spring-clip structure 5. The inner tube 4 is equipped with a rope for taking the inner tube 4 out of the core tube 3. The spring-clip structure 5 and the rope are conventional technical means and are not described in detail here.

[0013] The maximum outer diameter of the guide rod 1 is smaller than the inner diameter of the coring drill rod 2 and the core tube 3. An extension piece 6 is provided at the top of the guide rod 1, so that the reaming drill bit of the guide rod 1 is located outside the coring drill rod 2, ensuring the reaming operation requirements. A threaded connection part for connecting with the inner tube 4 is provided at the top of the extension piece 6. The extension piece 6 is connected to the inner tube 4 through a thread, and the connection is stable, which can prevent the guide rod 1 from falling as much as possible. The extension piece 6 is detachably connected to the guide rod 1, which is convenient for removing or replacing the extension piece 6. Among them, the extension piece 6 can directly adopt the spring seat commonly used at the coring site, which can be obtained from anywhere and is easy to assemble.

[0014] When in use, the guide rod 1 is used to guide and expand the hole. When the hole is expanded to match the size of the coring drill rod 2, the guide rod 1 and the inner tube 4 are removed from the core tube 3 by a rope to ensure the integrity of the rock sample drilled later. After the removal is completed, the coring drill rod 2 is used to collect the core.

Claims

1. A core drilling and reaming guide device, comprising a guide rod (1) and a core tube (3), characterized in that: It also comprises an inner tube (4) and a coring drill rod (2) threadedly connected to the core tube (3); the inner tube (4) is located inside the core tube (3) and connected together via a spring-clip structure (5); the inner tube (4) is equipped with a rope for removing the inner tube (4) from the core tube (3); the maximum outer diameter of the guide rod (1) is smaller than the inner diameters of the coring drill rod (2) and the core tube (3); the top end of the guide rod (1) is provided with a threaded connection portion for connecting with the inner tube (4); and the reaming drill bit of the guide rod (1) is located outside the coring drill rod (2).

2. A core drilling and hole enlarging guide device according to claim 1, characterized in that: An extension piece (6) is arranged at the top of the guide rod (1), and the threaded connection portion is arranged at the top of the extension piece (6).

3. A core drilling and hole enlarging guide device according to claim 2, characterized in that: The extension piece (6) is a spring seat.

4. A core drilling and hole enlarging guide device according to claim 2, characterized in that: The extension piece (6) is detachably connected to the guide rod (1).

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