Device for preventing hole shrinkage of drill hole in geotechnical engineering investigation

Abstract

The utility model relates to the technical field of geotechnical engineering investigation, and discloses a device for preventing hole shrinkage of a drill hole in geotechnical engineering investigation, which comprises a connecting block provided with a central hole used for being sleeved on the peripheral side of a drill rod; one end of each gravity rope is fixedly connected with the lower surface of the connecting block, and when the connecting block rotates, the other end of each gravity rope can protrude out of the projection size of the connecting block. The connecting block is installed on the drill rod, the drill rod can drive the iron chain to swing along with inertia while rotating, the other end of the iron chain can act on the hole wall of a drill hole, the effects of reaming and wall fixing are achieved for the drill hole, and then resistance generated by hole shrinkage of the drill hole in the pulling-out and drilling-down process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering investigation, in particular to a device for preventing drilling from shrinking in geotechnical engineering investigation. Background Art

[0002] Drilling is a common task in geotechnical engineering surveys. In conventional exploration, the borehole diameter is generally Φ110mm, and the drilling footage is generally 2 meters per round. However, due to the complexity of the strata, when encountering soft soil during the drilling process, the soft soil is very easy to shrink in diameter during drilling construction due to its high water content, high compressibility, low strength, and easy thixotropy. When the drill passes through the soft soil layer, the soft soil shrinks after the drill is pulled out, resulting in the inability to reach the previous drilling depth when the drill is lowered again, and the hole needs to be cleaned again. The hole often becomes shallower and shallower, and repeated work leads to reduced work efficiency.

[0003] The patent with the announcement number CN217976193U discloses a single-tube drill for core drilling that prevents shrinkage. In this patent, the diameter-protecting desilting part is rotated to cut the hole wall during the process of raising and lowering the drill rod, effectively overcoming the phenomenon of shrinkage caused by the deformation of the hole wall stratum into the hole under the action of pore water pressure and ground stress. However, the diameter-protecting desilting part in this patent can only cut on the basis of the original borehole diameter, and cannot achieve the effect of expanding the hole and consolidating the wall, and the borehole shrinkage phenomenon will still occur.

[0004] In view of this, how to change the current situation of borehole shrinkage in geotechnical engineering survey has become a technical problem that technical personnel in this field need to solve urgently. Utility Model Content

[0005] The utility model aims to provide a device for preventing the shrinkage of drilling holes in geotechnical engineering survey, so as to overcome the above-mentioned shortcomings.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is:

[0007] A device for preventing borehole shrinkage in geotechnical engineering investigation, comprising:

[0008] A connecting block having a central hole, wherein the central hole is used for sleeve connection on the peripheral side of the drill rod; and

[0009] A plurality of gravity ropes, one end of each gravity rope is fixedly connected to the lower surface of the connection block, and when the connection block rotates, the other end of each gravity rope can protrude beyond the projection size of the connection block.

[0010] Furthermore, the connection block includes a plurality of connection halves, which can be enclosed in a ring shape and are fixedly connected by fasteners. The center holes in the plurality of connection halves are used for fixed connection with the drill rod.

[0011] Furthermore, it also includes a clamping assembly, wherein two clamping assemblies are respectively arranged on the upper and lower surfaces of the connecting block, and the clamping assemblies are used to clamp the drill rod.

[0012] Furthermore, the clamping assembly comprises:

[0013] A rotating ring coaxially connected to the central hole for rotation, a plurality of sliding rods being arranged on the end surface of the rotating ring, and the plurality of sliding rods being distributed at intervals along the axis of the rotating ring; and

[0014] A plurality of clamping arms are arranged corresponding to the plurality of sliding rods, one end of the clamping arm is rotatably connected to the connecting block, a sliding groove is arranged in the middle of the clamping arm, the sliding rod is slidably connected in the sliding groove, and the other end of the clamping arm is used to clamp the drill rod.

[0015] Furthermore, the other end of the clamping arm is hingedly connected to a limit clamp, and the limit clamp is used to clamp the drill rod.

[0016] Furthermore, an end surface of the other end of the limiting clamp away from the clamping arm is arc-shaped.

[0017] Furthermore, the rotating ring is fixedly connected to a threaded sleeve, a positioning sleeve is arranged on the connecting block, a threaded rod is rotatably connected inside the positioning sleeve, and the threaded rod is threadedly connected to the threaded sleeve, and the limit clamp can be moved toward or away from the axis of the center hole by rotating the threaded rod.

[0018] Furthermore, the clamping arm is arc-shaped.

[0019] Furthermore, the gravity rope is an iron chain.

[0020] Compared with the prior art, the utility model has at least the following advantages:

[0021] The utility model installs the connection block on the drill rod, and the rotation of the drill rod can drive the iron chain to swing with inertia. The other end of the iron chain can act on the wall of the drill hole to achieve the effect of expanding the hole and consolidating the wall, thereby reducing the resistance caused by the shrinkage of the drill hole during the process of pulling out and drilling down. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the device for preventing the shrinkage of drilling holes in geotechnical engineering survey of the utility model;

[0024] Figure 2 It is a schematic diagram of the overall structure of the first embodiment of the device for preventing the shrinkage of drilling holes in geotechnical engineering survey according to the utility model from another perspective;

[0025] Figure 3 This is a schematic diagram of the drilling state of the device for preventing drilling shrinkage in geotechnical engineering investigation according to the utility model;

[0026] Figure 4 This is a schematic diagram of the soil taking state of the device for preventing the shrinkage of the drilling hole in geotechnical engineering investigation according to the utility model;

[0027] Figure 5 This is a schematic diagram of the overall structure of the second embodiment of the device for preventing the shrinkage of drilling holes in geotechnical engineering survey of the utility model;

[0028] Figure 6 It is a schematic diagram of the overall structure from another perspective of the second embodiment of the device for preventing drilling shrinkage in geotechnical engineering investigation of the utility model.

[0029] Figure numerals: 1, connecting block; 2, gravity rope; 3, connecting half; 4, fastener; 5, rotating ring; 6, sliding rod; 7, clamping arm; 8, sliding groove; 9, limit clamp; 10, threaded casing; 11, positioning casing; 12, threaded rod; 13, drill pipe; 14, core tube; 15, soft soil area; 16, abandoned soil. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Embodiment 1:

[0033] Reference Figure 1-2The utility model provides a device for preventing borehole shrinkage in geotechnical engineering investigation, comprising a connecting block 1 and a gravity rope 2. The connecting block 1 is provided with a center hole, which is used to be sleeved on the peripheral side of a drill rod 13 and connected to the drill rod 13. One end of the gravity rope 2 is fixedly connected to the lower surface of the connecting block 1. When the connecting block 1 rotates, the other end of the gravity rope 2 can protrude beyond the projection size of the center block. The gravity rope 2 is preferably an iron chain to provide sufficient weight and stability.

[0034] Preferably, the connecting block 1 includes multiple connecting halves 3, which can be enclosed in a ring shape and are fixedly connected by fasteners 4, which are preferably bolts and nuts. The center holes in the multiple connecting halves 3 are used for fixed connection with the drill rod 13.

[0035] In this embodiment, the connection block 1 includes two connection halves 3 , which are clamped on both sides of the drill rod 13 , and the two connection halves 3 are spliced ​​into the connection block 1 by bolts and nuts.

[0036] When in use, the center hole is roughened to increase the friction when the drill rod 13 is connected to the center hole. The iron chain is 10 cm long and is installed at the bottom of the connecting block 1 by welding. Figure 3-4 During the high-speed rotation of the drill rod 13, the iron chain swings with inertia, which also plays the role of expanding the hole and consolidating the wall. The excess spoil 16 will remain above the core tube 14 and the connecting block 1, and the excess spoil 16 will be brought out during the drilling process, thereby reducing the resistance caused by the shrinkage of the borehole during the drilling process.

[0037] Embodiment 2:

[0038] Reference Figure 5-6 The present embodiment further comprises a clamping assembly installed in the center hole, and the present embodiment realizes the connection between the connection block 1 and the drill hole through the clamping assembly. Specifically, two clamping assemblies are respectively arranged on the upper and lower surfaces of the connection block 1, and the clamping assemblies are used to realize the clamping effect of the drill rod 13.

[0039] Preferably, the clamping assembly comprises a rotating ring 5, a sliding rod 6 and a clamping arm 7. The rotating ring 5 is coaxially connected to the center hole, a plurality of sliding rods 6 are arranged on the end surface of the rotating ring 5, the plurality of sliding rods 6 are distributed in a circumferential array along the center of the rotating ring 5, a plurality of clamping arm 7 are arranged in a one-to-one correspondence with the plurality of sliding rods 6, the clamping arm 7 is arc-shaped, the clamping arm 7 is distributed in a circumferential array along the center of the rotating ring 5, one end of the clamping arm 7 is rotatably connected to the connecting block 1, a sliding groove 8 is arranged in the middle of the clamping arm 7, the sliding rod 6 is slidably connected in the sliding groove 8, and the other end of the clamping arm 7 is used to clamp the drill rod 13.

[0040] Preferably, the other end of the clamping arm 7 is hinged with a limit clamp 9, and the limit clamp 9 is used to clamp the drill rod 13. And the end surface of the limit clamp 9 away from the other end of the clamping arm 7 is arc-shaped.

[0041] Optionally, the rotating ring 5 is fixedly connected with a threaded sleeve 10, a positioning sleeve 11 is arranged on the connecting block 1, a threaded rod 12 is rotatably connected inside the positioning sleeve 11, and the threaded rod 12 is threadedly connected to the threaded sleeve 10, and the limit clamp 9 can be moved toward or away from the axis of the center hole by rotating the threaded rod 12.

[0042] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for preventing drilling shrinkage in geotechnical engineering survey, characterized in that: include: A connecting block (1) provided with a central hole, wherein the central hole is used for sleeve connection on the peripheral side of a drill rod (13); as well as A plurality of gravity ropes (2), one end of each gravity rope (2) being fixedly connected to the lower surface of the connection block (1), and when the connection block (1) rotates, the other end of each gravity rope (2) can protrude beyond the projection size of the connection block (1).

2. The device for preventing drilling shrinkage in geotechnical engineering investigation according to claim 1 is characterized in that: The connection block (1) comprises a plurality of connection halves (3), the plurality of connection halves (3) being able to enclose a ring shape, and the plurality of connection halves (3) being fixedly connected by fasteners (4), and the central holes in the plurality of connection halves (3) being used for fixed connection with a drill rod (13).

3. The device for preventing drilling shrinkage in geotechnical engineering investigation according to claim 1, characterized in that: It also comprises a clamping assembly, wherein the two clamping assemblies are respectively arranged on the upper and lower surfaces of the connecting block (1), and the clamping assemblies are used to clamp the drill rod (13).

4. The device for preventing drilling shrinkage in geotechnical engineering investigation according to claim 3 is characterized in that: The clamping assembly comprises: A rotating ring (5) coaxially rotatably connected to the central hole, a plurality of sliding rods (6) being arranged on the end surface of the rotating ring (5), and the plurality of sliding rods (6) being distributed at intervals along the circumference of the axis of the rotating ring; and A plurality of clamping arms (7) are arranged corresponding to the plurality of sliding rods (6), one end of the clamping arm (7) is rotatably connected to the connecting block (1), a sliding groove (8) is arranged in the middle of the clamping arm (7), the sliding rod (6) is slidably connected in the sliding groove (8), and the other end of the clamping arm (7) is used to clamp the drill rod (13).

5. The device for preventing drilling shrinkage in geotechnical engineering investigation according to claim 4 is characterized in that: The other end of the clamping arm (7) is hingedly connected to a limit clamp (9), and the limit clamp (9) is used to clamp the drill rod (13).

6. The device for preventing drilling shrinkage in geotechnical engineering investigation according to claim 5, characterized in that: The end surface of the other end of the limiting clamp (9) away from the clamping arm (7) is in an arc shape.

7. The device for preventing drilling shrinkage in geotechnical engineering investigation according to claim 5, characterized in that: The rotating ring (5) is fixedly connected to a threaded sleeve (10), a positioning sleeve (11) is arranged on the connecting block (1), a threaded rod (12) is rotatably connected inside the positioning sleeve (11), and the threaded rod (12) is threadedly connected to the threaded sleeve (10), and the limit clamp (9) can be moved toward or away from the axis of the center hole by rotating the threaded rod (12).

8. The device for preventing drilling shrinkage in geotechnical engineering investigation according to claim 7, characterized in that: The clamping arm (7) is arc-shaped.

9. The device for preventing drilling shrinkage in geotechnical engineering investigation according to any one of claims 1 to 8, characterized in that: The gravity rope (2) is an iron chain.

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