Drilling tools and one-step hole forming method

Abstract

The present invention discloses a drilling tool and a one-time hole-forming method, the drilling tool comprising a drill rod and a drill bit, the drill rod being provided with a center hole, an air inlet hole, an air outlet hole, a feed hole, and a discharge hole, the center hole, the air inlet hole, and the feed hole being all arranged at the first end of the drill rod, the air outlet hole being arranged on the side wall of the drill rod, the plurality of air outlet holes being provided, the plurality of air outlet holes being spaced apart along the circumference of the drill rod, the plurality of air outlet holes being connected to the air inlet hole, the air outlet holes being provided on the side wall of the drill rod, and the discharge hole being closer to the second end of the drill rod relative to the air outlet holes, the plurality of discharge holes being provided, the plurality of discharge holes being spaced apart along the circumference of the drill rod, the plurality of discharge holes being connected to the feed hole, the drill bit being connected to the second end of the drill rod, and the drill bit being connected to the center hole. During the drilling back process, the drilling tool of the present invention sprays an adhesive on the anchor hole wall to improve the anchor hole strength and reduce the phenomenon of hole collapse or difficulty in hole-forming.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel support, and in particular relates to a drilling tool and a one-time hole forming method. Background Art

[0002] The surrounding rock of the soft and broken coal seam is a heterogeneous layer with great differences. It is difficult for the surrounding rock to form a bearing structure and is prone to instability and collapse. In addition, due to its small Provost coefficient, small internal friction coefficient and small cohesion, the coal seam has a very small ability to withstand stress. After the anchor hole of the soft and broken coal seam roof is drilled, due to the secondary distribution of stress, the hole wall cannot withstand the self-weight stress above and the shear stress around, causing the hole wall to be damaged, resulting in collapse or difficulty in drilling. Therefore, when drilling anchor holes in the soft and broken coal seam roof, mines generally have problems such as shallow drilling depth, poor drilling stability, poor hole quality, low porosity and low anchoring force, which have a great impact on mine mining safety and mining costs. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, an embodiment of the present invention provides a drilling tool that sprays an adhesive onto the anchor hole wall during the drill back process to improve the anchor hole strength and reduce the phenomenon of hole collapse or difficulty in hole formation.

[0004] The second embodiment of the present invention further proposes a sequential pore forming method.

[0005] The drilling tool of an embodiment of the present invention includes a drill rod and a drill bit, the drill rod is provided with a center hole, an air inlet hole, an air outlet hole, a feed hole and a discharge hole, the center hole, the air inlet hole and the feed hole are all arranged at the first end of the drill rod, the air outlet hole is arranged on the side wall of the drill rod, there are multiple air outlet holes, and the multiple air outlet holes are distributed at intervals along the circumference of the drill rod, and the multiple air outlet holes are all connected to the air inlet hole, the air outlet hole is arranged on the side wall of the drill rod, and the discharge hole is close to the second end of the drill rod relative to the air outlet hole, there are multiple discharge holes, and the multiple discharge holes are distributed at intervals along the circumference of the drill rod, and the multiple discharge holes are all connected to the feed hole, the drill bit is connected to the second end of the drill rod, and the drill bit is connected to the center hole.

[0006] The drilling tool of the embodiment of the present invention allows air or water to be passed into the drill bit through the center hole, cools the drill bit during the drilling process and cleans broken debris out of the anchor hole; ventilates the anchor hole through the air inlet and outlet holes, blows the anchor hole wall to clean out debris, and prevents the debris from affecting the sprayed adhesive; sprays the adhesive onto the anchor hole wall through the feed port and the discharge port, thereby improving the strength of the anchor hole to reduce the phenomenon of hole collapse or difficulty in forming a hole.

[0007] In some embodiments, the air outlet is inclined from inside to outside along the radial direction of the drill rod toward the first end of the drill rod, and the material outlet is inclined from inside to outside along the radial direction of the drill rod toward the second end of the drill rod.

[0008] In some embodiments, the drill rod includes a first connecting section, a spraying section and a second connecting section. The first connecting section, the spraying section and the second connecting section are sequentially connected from the first end of the drill rod to the second end of the drill rod, and the air outlet and the discharge hole are both arranged on the spraying section.

[0009] In some embodiments, a plurality of first protrusions are provided on the side wall of the first connecting section, and the plurality of first protrusions are distributed at intervals along the circumference of the drill rod.

[0010] In some embodiments, a second protrusion is further provided on the side wall of the first connecting section, and the cross-sectional shape of the second protrusion is different from that of the first protrusion.

[0011] In some embodiments, the cross section of the spraying section is a regular polygon.

[0012] In some embodiments, the number of the side surfaces of the spraying section is equal to the number of the air outlet holes, and each side surface of the spraying section has one air outlet hole and one discharge hole.

[0013] The one-time pore forming method of the second embodiment of the present invention comprises:

[0014] Providing a drilling tool according to any one of the above embodiments, installing the drilling tool on a drilling rig and moving it to a drilling position;

[0015] introducing fluid into the central hole and starting the drilling machine to drill;

[0016] After the drilling is completed, the flow of fluid into the central hole is stopped;

[0017] Ventilate the air inlet and introduce adhesive into the feed hole, slowly withdraw the drill rod so that the adhesive is sprayed on the inner wall of the anchor hole until the air outlet and the discharge port are both moved out of the anchor hole;

[0018] The ventilation to the air inlet is stopped, and the introduction of the adhesive to the feed hole is stopped.

[0019] The one-time hole-forming method of the embodiment of the present invention is to introduce air or water into the drill bit through the center hole of the above-mentioned drilling tool, cool the drill bit during the drilling process and clean out broken debris from the anchor hole; ventilate the anchor hole through the air inlet and outlet holes of the above-mentioned drilling tool, blow the anchor hole wall to clean out debris, and prevent the debris from affecting the spraying of adhesive; spray the adhesive onto the anchor hole wall through the feed port and discharge port of the above-mentioned drilling tool, thereby improving the strength of the anchor hole to reduce the phenomenon of hole collapse or difficulty in hole forming.

[0020] In some embodiments, the adhesive is Line-x.

[0021] In some embodiments, the fluid is one of air and water. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 4 is a front view of a drilling tool according to an embodiment of the present invention.

[0023] Figure 2 This invention Figure 1 Partially enlarged view a.

[0024] Figure 3 2 is a bottom view of the drilling tool according to an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of a one-time pore forming method according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Drill rod 1; center hole 11; air inlet 12; air outlet 13; feed hole 14; discharge hole 15; first connecting section 16; first protrusion 161; second protrusion 162; spraying section 17; second connecting section 18;

[0028] Drill bit 2. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] The following describes a drilling tool according to an embodiment of the first aspect of the present invention with reference to the accompanying drawings.

[0031] like Figures 1 to 3 As shown, the drilling tool according to the embodiment of the present invention includes a drill rod 1 and a drill bit 2 .

[0032] The drill rod 1 is provided with a central hole 11, an air inlet hole 12, an air outlet hole 13, a feed hole 14 and a discharge hole 15. The central hole 11, the air inlet hole 12 and the feed hole 14 are all provided at the first end of the drill rod 1 (e.g. Figure 1 The air outlet hole 13 is provided on the side wall of the drill rod 1, and there are multiple air outlet holes 13, and the multiple air outlet holes 13 are distributed at intervals along the circumference of the drill rod 1, and the multiple air outlet holes 13 are connected to the air inlet hole 12. The air outlet hole 13 is provided on the side wall of the drill rod 1, and the discharge hole 15 is closer to the second end of the drill rod 1 relative to the air outlet hole 13. There are multiple discharge holes 15, and the multiple discharge holes 15 are distributed at intervals along the circumference of the drill rod 1, and the multiple discharge holes 15 are connected to the feed hole 14. The drill bit 2 is connected to the second end of the drill rod 1 (as shown in FIG. Figure 1 The drill bit 2 is connected to the center hole 11.

[0033] It should be noted that when the drilling tool is used, the lower end of the drill rod 1 is connected to the drilling rig. Before drilling, ventilation or water is passed to the drill bit 2 through the center hole 11 to cool the drill bit 2 and clean the broken debris out of the anchor hole. The drilling rig drives the drill rod 1 to rotate and the drill bit 2 to drill the surrounding rock. After the drilling is completed, the rotation of the drill rod 1 is stopped and the ventilation or water passage to the drill bit 2 is stopped. Subsequently, ventilation is introduced into the anchor hole through the air inlet hole 12 and the air outlet hole 13. The wind removes the debris on the hole wall (such as broken surrounding rock). The anchor hole is cleaned by blowing away impurities such as residue, dust, and water to prevent impurities from affecting the bonding effect of the adhesive. The adhesive is introduced into the anchor hole through the feed hole 14 and the discharge hole 15. The adhesive quickly bonds the soft and broken surface of the anchor hole, thereby improving the surface integrity of the anchor hole and enhancing the tensile, compressive and shearing properties of the anchor hole. Moreover, the adhesive bonds the soft and broken surface of the anchor hole, thereby enhancing the bonding force between the anchor agent and the surrounding rock and preventing water from seeping into the anchor hole, thereby avoiding water corrosion on the anchoring structure.

[0034] The drilling tool of the embodiment of the present invention allows air or water to be passed into the drill bit 2 through the center hole 11, so that the drill bit 2 is cooled during the drilling process and broken debris is cleaned out of the anchor hole; the anchor hole is ventilated through the air inlet hole 12 and the air outlet hole 13, and the anchor hole wall is blown to clean out debris to prevent the debris from affecting the spraying of the adhesive; the adhesive is sprayed onto the anchor hole wall through the feed port and the discharge port, thereby improving the strength of the anchor hole to reduce the phenomenon of hole collapse or difficulty in forming a hole.

[0035] like Figure 1 and Figure 2 As shown, in some embodiments, the air outlet 13 is inclined from the inside to the outside along the radial direction of the drill rod 1 toward the first end of the drill rod 1, and the discharge hole 15 is inclined from the inside to the outside along the radial direction of the drill rod 1 toward the second end of the drill rod 1. It can be understood that the air outlet 13 is inclined from the inside to the outside along the radial direction of the drill rod 1 toward the first end of the drill rod 1, so that the airflow discharged from the air outlet 13 is swept out of the anchor hole, thereby sweeping away debris on the hole wall to the outside of the anchor hole, preventing the airflow or debris from affecting the spraying of the adhesive at the discharge port; the discharge hole 15 is inclined from the inside to the outside along the radial direction of the drill rod 1 toward the second end of the drill rod 1, so that the adhesive is sprayed toward the bottom of the anchor hole, preventing the adhesive spraying from being affected by the airflow from the air outlet.

[0036] like Figure 1 As shown, in some embodiments, the drill rod 1 includes a first connecting section 16, a spraying section 17 and a second connecting section 18. The first connecting section 16, the spraying section 17 and the second connecting section 18 are sequentially connected from the first end of the drill rod 1 to the second end of the drill rod 1, and the air outlet 13 and the discharge hole 15 are both arranged on the spraying section 17.

[0037] like Figure 3 As shown, further, a plurality of first protrusions 161 are provided on the side wall of the first connecting section 16, and the plurality of first protrusions 161 are distributed at intervals along the circumference of the drill rod 1, thereby ensuring that the drill rod 1 and the drilling rig rotate synchronously.

[0038] like Figure 3 As shown, further, a second protrusion 162 is provided on the side wall of the first connecting section 16. The cross-sectional shape of the second protrusion 162 is different from that of the first protrusion 161. The second protrusion 162 avoids the misalignment of the drill rod 1 and the drilling rig, which causes abnormal communication between the air inlet 12 and the feed hole 14 and the pumping device, thereby avoiding the reduction of the air volume of the air outlet 13 and the amount of adhesive at the discharge port, or even the lack of wind at the air outlet 13 and the lack of adhesive at the discharge port, which affects the effect of enhancing the efficiency of the anchor hole.

[0039] Optionally, the cross section of the first protrusion 161 is fan-shaped, the cross section of the second protrusion 162 is triangular, and the cross-sectional area of the second protrusion 162 is larger than the cross-sectional area of the first protrusion 161 .

[0040] like Figures 1 to 3 As shown, in some embodiments, the cross section of the spraying section 17 is a regular polygon.

[0041] like Figure 1 and Figure 2 As shown, further, the number of the side surfaces of the spraying section 17 is equal to the number of the air outlet holes 13 , and each side surface of the spraying section 17 has an air outlet hole 13 and a discharge hole 15 .

[0042] The following describes the one-time pore forming method according to the second embodiment of the present invention in conjunction with the accompanying drawings.

[0043] like Figure 4 As shown, the one-time pore forming method of the second embodiment of the present invention includes:

[0044] Providing a drilling tool according to any one of the above embodiments, installing the drilling tool on a drilling rig, positioning the anchor rod and the drilling rig, and then moving the drilling rig and the drilling tool to a drilling position;

[0045] A fluid, such as air or water, is introduced into the central hole 11 through a pumping device, and the drilling rig is started to rotate the drill rod 1 and the drill bit 2 to perform drilling;

[0046] After the drilling is completed, the flow of fluid into the center hole 11 is stopped;

[0047] Ventilate the air through the air inlet 12, and the air is discharged from the air outlet to the wall of the anchor hole to remove debris in the anchor hole. Then, introduce adhesive into the feed hole 14, and the adhesive is discharged from the drill rod 1 through the discharge port and sprayed onto the wall of the anchor hole. The adhesive quickly bonds the soft and broken surface of the anchor hole. Slowly withdraw the drill rod 1 so that the adhesive is sprayed onto the inner wall of the anchor hole until the air outlet and the discharge port are both removed from the anchor hole.

[0048] Stop ventilation to the air inlet 12 and stop feeding the adhesive to the feed hole 14.

[0049] The one-time hole-forming method of the embodiment of the present invention introduces air or water into the drill bit 2 through the center hole 11 of the above-mentioned drilling tool, cools the drill bit 2 during the drilling process and cleans out broken debris from the anchor hole; ventilates the anchor hole through the air inlet hole 12 and the air outlet hole 13 of the above-mentioned drilling tool, blows the anchor hole wall to clean out debris, and prevents the debris from affecting the spraying of the adhesive; sprays the adhesive onto the anchor hole wall through the feed port and the discharge port of the above-mentioned drilling tool, thereby improving the strength of the anchor hole to reduce the phenomenon of hole collapse or difficulty in hole forming.

[0050] In some embodiments, the adhesive is Line-x. After the adhesive is sprayed on the wall of the anchor hole, it quickly bonds the soft and broken anchor hole surface, improves the surface area integrity, and enhances the tensile, compressive and shear resistance. In addition, after the adhesive bonds the soft and broken anchor hole surface, it enhances the bonding strength between the anchor and the surrounding rock, and at the same time prevents water from seeping into the anchor hole, avoiding water corrosion on the anchoring structure.

[0051] In some embodiments, the fluid is one of air and water, and the fluid cools the drill bit 2 and discharges cutting debris in the anchor hole out of the anchor hole.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0054] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0056] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0057] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A drilling tool, characterized in that: The invention comprises a drill rod and a drill bit, wherein the drill rod is provided with a center hole, an air inlet hole, an air outlet hole, a feed hole and a discharge hole, the center hole, the air inlet hole and the feed hole are all arranged at the first end of the drill rod, the air outlet hole is arranged on the side wall of the drill rod, there are a plurality of air outlet holes, the plurality of air outlet holes are spaced apart along the circumference of the drill rod, the plurality of air outlet holes are all connected with the air inlet hole, the air outlet hole is arranged on the side wall of the drill rod, and the discharge hole is close to the second end of the drill rod relative to the air outlet hole, there are a plurality of discharge holes, the plurality of discharge holes are spaced apart along the circumference of the drill rod, the plurality of discharge holes are all connected with the feed hole, the drill bit is connected to the second end of the drill rod, and the drill bit is connected with the center hole; The air outlet is inclined from the inside to the outside along the radial direction of the drill rod toward the first end of the drill rod, and the material outlet is inclined from the inside to the outside along the radial direction of the drill rod toward the second end of the drill rod; The drill rod includes a first connecting section, a material spraying section, and a second connecting section, wherein the first connecting section, the material spraying section, and the second connecting section are sequentially connected from the first end of the drill rod to the second end of the drill rod, and the air outlet and the material outlet are both provided on the material spraying section; A plurality of first protrusions are provided on the side wall of the first connecting section, and the plurality of first protrusions are distributed at intervals along the circumference of the drill rod; A second protrusion is further provided on the side wall of the first connecting section, and the cross-sectional shape of the second protrusion is different from that of the first protrusion.

2. The drilling tool according to claim 1, characterized in that The cross section of the material spraying section is a regular polygon.

3. The drilling tool according to claim 2, characterized in that The number of the side surfaces of the spraying section is equal to the number of the air outlet holes, and each side surface of the spraying section has one air outlet hole and one discharge hole.

4. A one-time hole forming method, characterized in that: include: Providing a drilling tool according to any one of claims 1 to 3, installing the drilling tool on a drilling rig and moving it to a drilling position; introducing fluid into the central hole and starting the drilling machine to drill; After the drilling is completed, the flow of fluid into the central hole is stopped; Ventilate the air inlet and introduce adhesive into the feed hole, slowly withdraw the drill rod so that the adhesive is sprayed on the inner wall of the anchor hole until the air outlet and the discharge hole are both moved out of the anchor hole; The ventilation to the air inlet is stopped, and the introduction of the adhesive to the feed hole is stopped.

5. The one-time hole forming method according to claim 4, characterized in that: The adhesive is Line-x.

6. The one-time hole forming method according to claim 4, characterized in that: The fluid is one of air and water.

Images