Support drilling construction method for coal body crack broken area and application of support drilling construction method

Abstract

The invention provides a support drilling construction method and application of a coal fracture crushing area, and the construction method comprises the following steps: laying and fixing a metal net on the surface of the coal fracture crushing area, laying and fixing a plurality of criss-cross metal belts on the outer side of the metal net to form a grating net belt, a plurality of intersection points formed by two intersected metal belts are formed on the grid net belt, drill holes with certain inclination angles are formed in the intersection points, drill holes are constructed in the metal belts, the metal net and the coal body fracture crushing area by adopting a drill rod and a drill bit, the drill holes extend to the undamaged coal body area, and coal powder is discharged outwards through the drill holes; and the anchor rod sequentially penetrates through the metal belt and the metal net and then is inserted into the drill hole, and the tray is fixed to the outer portion of the metal belt. The method can ensure normal drilling construction under the condition that the exterior of the surrounding rock is broken, ensures that an anchoring agent and an anchor rod are normally loaded into the drill hole, achieves the purpose of normal supporting of the roadway surrounding rock, and is suitable for underground coal mining or open pit coal mine slope protection.

Description

Technical Field

[0001] The present invention relates to the technical field of anchor support, and in particular to a support drilling construction method and application of a coal body fissure and crushing zone. Background Art

[0002] During the sequential mining of the rock burst coal seam working face, small coal pillars are generally left between the working face and the adjacent goaf to protect the tunnel. During the mining period of the working face, the small coal pillars are affected by the combined influence of the advance support pressure and the gravity of the overlying coal and rock layers, resulting in local areas of coal body fragmentation. In order to ensure the normal use of the tunnel, it is necessary to strengthen the support of the fragmented area in a timely manner. The traditional construction method of support drilling generally uses Φ19mm soft rock drill rods with Φ24-30mm drill bits. However, due to the internal cracks and fragments of the coal body, the traditional method of constructing support drilling is prone to collapse, and it is impossible to smoothly install anchoring agents and support anchors (cables). Summary of the Invention

[0003] The present invention aims to address, at least to a certain extent, one of the technical problems in the related art. To this end, embodiments of the present invention provide a method and application for supporting drilling in a fractured coal body zone. This method ensures normal drilling in the presence of externally fractured surrounding rock, ensures the proper loading of anchoring agents and bolts into the borehole, and achieves the purpose of properly supporting the surrounding rock of the roadway.

[0004] In one embodiment of the present invention, a method for supporting drilling in a fractured coal body zone is provided, comprising the following steps:

[0005] S1. Mark the location where the drilling is required on the surface of the coal fracture and crushing area;

[0006] S2. Lay and fix a metal mesh on the surface of the fractured and broken area of ​​the coal body, with the metal mesh covering all the drilling marks;

[0007] S3. Lay and fix a plurality of crisscross metal strips on the outside of the metal mesh to form a grid mesh belt. The grid mesh belt has a plurality of intersections formed by two intersecting metal strips. Drill hole marks are located at the intersections so that the intersections cover the drill holes.

[0008] S4. A through hole is opened at the intersection covered with the drilling mark. A suitable drill rod and drill bit are used to drill through the through hole to the metal mesh and the surface of the coal fracture and fracture area. The drill hole is extended to the undamaged coal area, and the coal powder is discharged outward through the drill hole;

[0009] S5. Insert the anchor rod through the metal belt and metal mesh in sequence and into the drilled hole, and fix the tray on the outside of the metal belt.

[0010] In some embodiments, the drill hole has a certain inclination angle, and the angle between the anchor rods and the surface of the coal fracture and crushing zone is 45 to 135 degrees, and all the anchor rods form an interwoven network structure.

[0011] In some embodiments, the borehole is inclined in a vertical or horizontal direction.

[0012] In some embodiments, in step S5, the anchor rod is a grouting anchor rod, and after the anchor rod is inserted into the borehole, an anchoring agent is injected into the borehole through the anchor rod.

[0013] In some embodiments, in step S5, a two-component anchoring agent is first loaded into the borehole, and then the anchor rod is screwed into the borehole to mix the two-component anchoring agent evenly.

[0014] In some embodiments, the tray is detachably fixed to the surface of the coal fracture and crushing zone by bolts, the bolts pass through the metal belt and the metal mesh, and the outer diameter of the tray is smaller than the width of the metal belt.

[0015] In some embodiments, the diameter of the drilled hole is 1.2 to 1.5 times the outer diameter of the anchor rod.

[0016] In some embodiments, the metal mesh and the metal belt are both made of stainless steel.

[0017] In some embodiments, the drill rod is an auger drill rod.

[0018] Another embodiment of the present invention provides an application of the above-mentioned support drilling construction method in underground coal mining or open-pit coal mine slope protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings.

[0020] in:

[0021] Figure 1 A schematic diagram of a support drilling construction method for a coal body fracture and crushing zone according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the connection relationship between the anchor rod, tray, metal mesh and metal belt from the left perspective;

[0023] Reference numerals:

[0024] 1. Metal mesh; 2. Metal belt; 3. Tray; 4. Coal body fracture and crushing area; 5. Coal seam roof; 6. Goaf; 7. Anchor rod; 8. Coal seam floor; 9. Undamaged coal body area. DETAILED DESCRIPTION

[0025] 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.

[0026] The following describes the support drilling construction method and application of the coal body fracture and crushing zone according to the embodiment of the present invention with reference to the accompanying drawings.

[0027] like Figure 1 、 2 As shown, the embodiment of the present invention provides a support drilling construction method for a coal fracture and crushing zone, comprising the following steps:

[0028] S1. Mark the location where the drilling is required on the surface of the coal fracture and crushing zone 4;

[0029] S2. Lay and fix the metal mesh 1 on the surface of the coal fracture and crushing zone 4, so that the metal mesh 1 covers all the drilling marks;

[0030] S3. Lay and fix several crisscross metal strips 2 on the outside of the metal mesh 1 to form a grid mesh belt. The grid mesh belt has several intersections formed by two intersecting metal strips 2. Drill hole marks are located at the intersections so that the intersections cover the drill holes.

[0031] S4. A through hole is opened at the intersection covered with the drilling mark. A suitable drill rod and drill bit are used to drill through the through hole to the surface of the metal mesh 1 and the coal fracture and crushing area 4. The drill hole is extended to the undamaged coal area 9, and the coal powder is discharged outward through the drill hole;

[0032] S5. Insert the anchor rod 7 through the metal belt 2 and the metal mesh 1 in sequence and then into the drilled hole, and fix the tray 3 on the outside of the metal belt 2.

[0033] The method of the embodiment of the present invention can ensure normal drilling construction when the surrounding rock is broken, ensure the normal loading of anchoring agent and anchor rod 7 into the borehole, and achieve the purpose of normal support of the tunnel surrounding rock. The on-site construction operation is simple, fast and efficient.

[0034] It should be noted that Figure 1 It is shown that the coal body fracture and crushing area 4, the undamaged coal body area 9 and the goaf area 6 are located between the coal seam roof 5 and the coal seam floor 8.

[0035] In some embodiments, the drilled holes are tilted at a certain angle, with the angle between the anchor rods 7 and the surface of the coal fracture zone 4 being 45 to 135 degrees, forming an interwoven mesh structure. By inserting the anchor rods 7 obliquely, the multi-angle and multi-directional support prevents the fractured coal from loosening. Furthermore, the injection of the anchoring agent solidifies the surrounding coal and the anchor rods 7 into a single entity, improving support strength.

[0036] Furthermore, the distance between two adjacent boreholes is 0.5 to 0.9 m.

[0037] In some embodiments, the borehole is inclined in a vertical or horizontal direction.

[0038] In some embodiments, in step S5, an anchoring agent is injected into the borehole. There are two ways to inject the anchoring agent. The first way is to use a grouting anchor rod 7. After the anchor rod 7 is inserted into the borehole, the anchoring agent is injected into the borehole through the anchor rod 7. The second way is to first load the borehole with a two-component anchoring agent, then screw the anchor rod into the borehole to mix the two-component anchoring agent evenly. The method can be selected according to actual conditions.

[0039] It should be noted that the principle of the two-component anchoring agent is based on a chemical reaction crosslinking mechanism. After the two components are mixed, a polymerization reaction occurs to form a three-dimensional network structure, achieving a strong anchoring effect. In actual operation, the two-component anchoring agent includes separate components A and B. Components A and B are placed into the borehole in sequence and mixed evenly using the spiral agitation of the anchor rod 7. If components A and B have an outer shell, the agitation of the anchor rod 7 breaks the outer shell, allowing components A and B to contact and mix evenly.

[0040] In some embodiments, the tray 3 is detachably fixed to the surface of the coal fracture zone 4 by bolts, the bolts passing through the metal belt 2 and the metal mesh 1, and the outer diameter of the tray 3 is smaller than the width of the metal belt 2, thereby improving the strength of the support.

[0041] Furthermore, the shape of the tray 3 can be circular or square.

[0042] In some embodiments, the borehole diameter is 1.2 to 1.5 times the outer diameter of the anchor rod 7. Increasing the borehole diameter not only effectively discharges coal dust from the borehole, but also prevents the coal in the fractured and broken coal zone 4 from collapsing or collapsing sufficiently within a short period of time, thereby preventing the borehole from completely blocking. This facilitates the smooth installation of the anchor rod 7 and the anchoring agent. Furthermore, the increased borehole diameter allows for a greater amount of anchoring agent to be injected, further enhancing support strength.

[0043] In some embodiments, the metal mesh 1 and the metal belt 2 are both made of stainless steel, which can improve support strength and corrosion resistance.

[0044] In some embodiments, the drill rod is a spiral drill rod. By driving the drill rod in reverse, the coal powder in the borehole can be discharged outward.

[0045] Furthermore, the drill rod adopts a Φ42mm spiral drill rod and a Φ42mm drill bit.

[0046] Another embodiment of the present invention provides an application of the above-mentioned support drilling construction method in underground coal mining or open-pit coal mine slope protection.

[0047] The present invention is further described below through specific examples.

[0048] Example 1

[0049] A support drilling construction method for a coal body fracture and crushing zone comprises the following steps:

[0050] S1. Plan the number, diameter, angle, and location of the drill holes according to the actual situation, and mark the locations where the holes need to be drilled on the surface of the coal fracture zone 4. The diameter of the drill holes is designed to be 1.2 times the outer diameter of the anchor rod 7.

[0051] S2. Lay and fix the metal mesh 1 on the surface of the coal body fracture and crushing zone 4, and the metal mesh 1 covers all the drilling marks.

[0052] S3. Use several crisscross metal belts 2 to lay and fix on the outside of the metal mesh 1 to form a grid mesh belt. The grid mesh belt has several intersections formed by two intersecting metal belts 2. The drilling marks are located at the intersections, and the intersections cover the drill holes.

[0053] S4. A through hole is drilled through the intersection marked with a drill mark. Using a suitable drill rod and drill bit, a hole is drilled through the through hole into the metal mesh 1 and the surface of the coal fracture zone 4. The hole is extended to the undamaged coal zone 9. The drill hole is tilted at a certain angle, so that the angle between the anchor rod 7 and the surface of the coal fracture zone 4 is 45-135 degrees. The coal dust in the hole is then discharged using an auger.

[0054] S5. Insert the anchor rod 7 through the metal belt 2 and the metal mesh 1 in sequence into the drill hole, and fix the tray 3 on the outside of the metal belt 2. The anchor rod 7 is a grouting anchor rod, and the anchoring agent is injected into the drill hole through the anchor rod 7.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A support drilling construction method for coal body fracture and crushing zone, characterized in that: The steps include: S1. Mark the location where the drilling is required on the surface of the coal fracture and crushing area; S2. Laying and fixing a metal mesh on the surface of the coal fracture and crushing area, wherein the metal mesh covers all drilling marks; S3. Laying and fixing a plurality of crisscross metal strips on the outside of the metal mesh to form a grid mesh belt, wherein the grid mesh belt has a plurality of intersections formed by two intersecting metal strips, and drilling marks are located at the intersections so that the intersections cover the drill holes; S4. A through hole is opened at the intersection covered with the drilling mark, and a suitable drill rod and drill bit are used to drill a hole through the through hole toward the metal mesh and the surface of the fractured and broken area of ​​the coal body. The drill hole extends to the undamaged coal body area, and the coal powder is discharged outward through the drill hole; S5. Insert the anchor rod through the metal belt and the metal mesh in sequence and then into the drilled hole, and fix the tray on the outside of the metal belt.

2. The support drilling construction method for coal body fracture and crushing zone according to claim 1 is characterized in that: The drill hole has a certain inclination angle, and the angle between the anchor rods and the surface of the coal body fracture and crushing zone is 45 to 135 degrees, and all the anchor rods form an interwoven network structure.

3. The support drilling construction method for coal body fracture and crushing zone according to claim 2 is characterized in that: The borehole is inclined in a vertical direction or a horizontal direction.

4. The support drilling construction method for coal body fracture and crushing zone according to claim 1 is characterized in that: In step S5, the anchor rod is a grouting anchor rod, and after the anchor rod is inserted into the borehole, an anchoring agent is injected into the borehole through the anchor rod.

5. The support drilling construction method for coal body fracture and crushing zone according to claim 1 is characterized in that: In step S5, a two-component anchoring agent is firstly loaded into the borehole, and then the anchor rod is screwed into the borehole to mix the two-component anchoring agent evenly.

6. The support drilling construction method for coal body fracture and crushing zone according to claim 1 is characterized in that: The tray is detachably fixed to the surface of the coal body fracture and crushing zone by bolts, the bolts penetrate the metal belt and the metal mesh, and the outer diameter of the tray is smaller than the width of the metal belt.

7. The support drilling construction method for coal body fracture and crushing zone according to claim 1 is characterized in that: The diameter of the drill hole is 1.2 to 1.5 times the outer diameter of the anchor rod.

8. The support drilling construction method for coal body fracture and crushing zone according to claim 1 is characterized in that: The metal mesh and the metal belt are both made of stainless steel.

9. The support drilling construction method for coal body fracture and crushing zone according to claim 1 is characterized in that: The drill pipe is a spiral drill pipe.

10. Application of the support drilling construction method according to any one of claims 1 to 9 in underground coal mining or open-pit coal mine slope protection.

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