Narrow coal pillar instability prevention and control supporting device

Abstract

The utility model belongs to the technical field of coal pillar instability control, and particularly relates to a narrow coal pillar instability prevention and control supporting device which comprises a transverse anchor rod and an intersection unit, and the transverse anchor rod is located in a transverse penetrating type anchor hole in the bottom of a narrow coal pillar; the first hollow anchor rod and the second hollow anchor rod are located in anchor holes in the two sides of the narrow coal pillar, a thickened hole and a convex hole are formed in the lower end and the upper end of each anchor hole respectively, the convex holes in the upper ends of the two anchor holes intersect in the center area of the narrow coal pillar, and a convex pipe is arranged at the upper end of the second hollow anchor rod and penetrates through the interior of the convex rod at the upper end of the first hollow anchor rod. The method is used for enabling the central area of the narrow coal pillar to form tension support for the outside fragile area. The inner and outer double supporting effect can be achieved on the narrow coal pillar, instability spreading of fragile areas on the two sides of the narrow coal pillar can be effectively relieved, and corresponding protection measures can be conveniently taken in the early stage of instability.

Description

Technical Field

[0001] This utility model belongs to the field of coal pillar instability control technology, and in particular relates to a narrow coal pillar instability prevention and control support device. Background Technology

[0002] A coal pillar is a portion of the ore body that is temporarily or permanently left unmined during underground coal mining for the sake of convenience and safety. Narrow coal pillars, in particular, have fractured zones on both sides, and are affected by the mining activity of the next working face. The fractured zones on both sides of the coal pillar will develop towards the center of the coal pillar, causing the narrow coal pillar to undergo large plastic deformation, which makes it prone to instability.

[0003] Currently, when reinforcing narrow coal pillars, anchor bolts are often installed on both sides of the wall. Due to the influence of the construction environment, the anchor bolts on both sides cannot be directly connected, resulting in each bolt working independently. A single anchor bolt cannot effectively support the easily broken coal seam on the outside, leading to the instability of the easily broken coal seam that cannot be effectively controlled.

[0004] To address the aforementioned issues, this application proposes a support device for preventing instability in narrow coal pillars. Utility Model Content

[0005] The purpose of this invention is to provide a support device for preventing and controlling instability in narrow coal pillars, which solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model is a support device for preventing instability of narrow coal pillars, including transverse anchor bolts and intersection units. The transverse anchor bolts are located in transverse through-type anchor holes at the bottom of the narrow coal pillar.

[0008] The first hollow anchor and the second hollow anchor are located inside the anchor holes on both sides of the narrow coal pillar. The lower end and the upper end of the anchor holes are respectively provided with thickening holes and protruding holes. The protruding holes at the upper end of the two anchor holes meet in the central area of ​​the narrow coal pillar. The upper end of the second hollow anchor is provided with a protruding tube that passes through the protruding rod at the upper end of the first hollow anchor, so as to make the central area of ​​the narrow coal pillar provide tensile support to the easily broken area on the outside.

[0009] The push plate and the support column are located on the wall of the narrow coal pillar. The support column abuts against the outside of the push plate to provide thrust support to the wall of the narrow coal pillar. Combined with the tie rods inside the first and second hollow anchor rods, a double support effect is formed inside and outside.

[0010] Furthermore, the upper end of the first hollow anchor rod and the inside of the convex tube are respectively provided with positioning holes and through holes for grouting, so as to fix the top of the first hollow anchor rod and the second hollow anchor rod to the stable area of ​​the center of the narrow coal pillar.

[0011] Furthermore, the upper end of the tie rod is provided with a connecting rod located inside the first hollow anchor rod and the second hollow anchor rod, and the lower end of the tie rod is helically fitted with a helical sleeve.

[0012] Furthermore, the push plate has a ring sleeve on its outer side, which is fitted onto the outer side of the spiral sleeve. The outer side of the spiral sleeve has an outer ring block, which is rotatably installed inside the annular groove on the inner side of the lower end of the ring sleeve.

[0013] Furthermore, the push plate is provided with bearing seats on both sides for inserting support columns, thereby making the adjacent push plates neatly arranged.

[0014] Furthermore, the outer side of the support column is provided with a limiting clamp connected to the push plate, which is used to fix the height position of the push plate so that it remains stable and prevents displacement when it loosens in the easily broken area of ​​the narrow coal pillar.

[0015] Furthermore, the confluence unit is inclined above the transverse anchor hole at the bottom of the transverse anchor bolt, so as to achieve the effect of the two anchor holes confluenced.

[0016] This utility model has the following beneficial effects:

[0017] This invention involves creating an anchor hole at the bottom of a narrow coal pillar, then moving upwards a predetermined distance to drill oblique holes, forming interlocking anchor holes. This allows for the staggered installation of the first and second hollow anchor rods, forming a triangular structure. The top of the anchor rod is fixed to the center of the narrow coal pillar in a less vulnerable area. This arrangement enables the central area to provide tensile support to the already broken areas on the outside, thereby strengthening the stability of the coal seam in the outer area, delaying the spread of breakage, and achieving the effect of instability prevention and control.

[0018] This utility model, through the vertical arrangement of push plates, can block the support column after it is installed, and together with the tensile support of the connecting rod, it forms a double support effect. Thus, it can achieve both tensile support and thrust support, making the fragile outer area more stable, and facilitating subsequent maintenance and reinforcement.

[0019] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the narrow coal column cross-section structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the multi-layered combined structure of the second hollow anchor rod and the first hollow anchor rod of this utility model;

[0024] Figure 4 This is a schematic diagram of the connection between the second hollow anchor rod and the first hollow anchor rod of this utility model.

[0025] Figure 5 This is a partially enlarged structural diagram of part A of this utility model;

[0026] The attached diagram lists the components represented by each number as follows:

[0027] In the diagram: 1. Horizontal anchor bolt; 2. First hollow anchor bolt; 201. Protruding rod; 202. Positioning hole; 3. Second hollow anchor bolt; 301. Protruding tube; 4. Tie rod; 401. Connecting rod; 402. Spiral sleeve; 403. Outer ring block; 5. Push plate; 501. Shaft seat; 502. Ring sleeve; 503. Ring groove; 6. Support column; 601. Limiting clamp; 7. Intersection unit; 701. Anchor hole; 702. Thickened hole; 703. Protruding hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Please see Figure 1-5 As shown, this utility model is a support device for preventing and controlling instability of a narrow coal pillar, including a transverse anchor 1 and a confluence unit 7. The transverse anchor 1 is located in a transverse through-type anchor hole at the bottom of the narrow coal pillar.

[0031] The first hollow anchor bolt 2 and the second hollow anchor bolt 3 are located inside the anchor holes 701 on both sides of the narrow coal pillar. The lower end and the upper end of the anchor holes 701 are respectively provided with a thickening hole 702 and a protrusion hole 703. The protrusion holes 703 at the upper end of the two anchor holes 701 meet in the central area of ​​the narrow coal pillar. The upper end of the second hollow anchor bolt 3 is provided with a protrusion tube 301 that passes through the protrusion rod 201 at the upper end of the first hollow anchor bolt 2, which is used to make the central area of ​​the narrow coal pillar provide tensile support to the easily broken area on the outside.

[0032] Push plate 5 and support column 6, push plate 5 is located on the wall of narrow coal pillar, support column 6 abuts against the outside of push plate 5 to form thrust support on the wall of narrow coal pillar, and combined with tie rod 4 inside the first hollow anchor 2 and the second hollow anchor 3 to form a double support effect inside and outside.

[0033] This embodiment provides a support mechanism that can prevent the instability of the sidewalls of narrow coal pillars in both directions. By using the symmetrically inclined anchor holes 701 on both sides, the first hollow anchor 2 and the second hollow anchor 3 can meet in the central area of ​​the narrow coal pillar and form a triangular structure to increase the support performance. This also allows them to be fixed in the central area to provide tensile support to the coal seam in the outer area. In addition, combined with the limiting of the push plate 5 by the support column 6, a support effect from the outside to the inside is formed. This creates a double support from the inside and outside, effectively preventing the spread of instability and breakage, and facilitating timely adjustments and reinforcement.

[0034] The upper end of the first hollow anchor rod 2 and the inside of the convex tube 301 are respectively provided with positioning holes 202 and through holes for grouting. These are used to fix the top of the first hollow anchor rod 2 and the second hollow anchor rod 3 to the stable area of ​​the center of the narrow coal pillar, forming an upward tensile support and enabling the two sides to work together. In the case of damage on one side and fixation on the other side, the tensile support performance of the damaged area is enhanced.

[0035] The upper end of the tie rod 4 is provided with a connecting rod 401 located inside the first hollow anchor rod 2 and the second hollow anchor rod 3. The lower end of the tie rod 4 is spirally fitted with a spiral sleeve 402. The outer side of the push plate 5 is provided with a ring sleeve 502, which is fitted on the outer side of the spiral sleeve 402. The outer side of the spiral sleeve 402 is provided with an outer ring block 403, which is rotatably installed inside the annular groove 503 on the inner side of the lower end of the ring sleeve 502. This forms a movement mode in which the inner side rotates but the outer side does not rotate, which is used to drive the push plate 5 to approach the wall of the narrow coal pillar and maintain its directional stability.

[0036] Among them, the push plate 5 is provided with a bearing 501 on both sides for the support column 6 to pass through, so that the upper and lower adjacent push plates 5 are neatly arranged, ensuring that the control area of ​​each push plate 5 is staggered and increasing the control range.

[0037] Among them, the outer side of the support column 6 is provided with a limiting clamp 601 connected to the push plate 5, which is used to fix the height position of the push plate 5 so that it remains stable and prevents displacement when it loosens in the easily broken area of ​​the narrow coal column, and at the same time forms a secondary support force to enhance stability.

[0038] Among them, the confluence unit 7 is opened at an angle above the horizontal anchor hole at the bottom of the horizontal anchor rod 1, so as to achieve the effect of mutual confluence of the two anchor holes 701.

[0039] Understandably, this utility model can provide dual internal and external support for narrow coal pillars, effectively mitigating the instability and spread of easily broken areas on both sides of the narrow coal pillar, and facilitating the implementation of corresponding protective measures in the early stages of instability.

[0040] A specific application of the operation process of this embodiment is as follows: In use, firstly, a horizontal through-hole is opened at the bottom of the narrow coal pillar to install the horizontal anchor rod 1. Then, based on this, an oblique anchor hole 701 is opened in the upper area, and the anchor holes 701 on both sides of the narrow coal pillar are staggered to install the first hollow anchor rod 2 and the second hollow anchor rod 3. At this time, the convex tube 301 passes through the convex rod 201, and the two are fused together after grouting. After this arrangement, the first hollow anchor rod 2 and the second hollow anchor rod 3 form a triangular structure, which not only enhances the resistance to external forces, but also uses the fixed area in the center of the narrow coal pillar to form tensile support for the easily broken area on the outside. In addition, combined with the reinforcement of the push plate 5 by the support column 6, it can form thrust support for the outer wall of the narrow coal pillar from the outside, thus forming a double support effect inside and outside. This not only strengthens the stability of the coal seam in this area, but also delays the spread of breakage and makes it convenient to make corresponding adjustments. While achieving the instability prevention and control of the narrow coal pillar, it also facilitates the reinforcement and maintenance of the support mechanism by the staff.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A narrow coal pillar instability prevention and control supporting device, comprising a transverse anchor rod (1) and an intersection unit (7), the transverse anchor rod (1) is located in a transverse through-type anchor hole at the bottom of the narrow coal pillar, characterized in that: the intersection unit (7) comprises an anchor hole (701); a first hollow anchor rod (2) and a second hollow anchor rod (3) are located in the anchor hole (701) on both sides of the narrow coal pillar, the lower end and the upper end of the anchor hole (701) are respectively provided with a thickened hole (702) and a protruding hole (703), the protruding holes (703) at the upper ends of the two anchor holes (701) intersect at the central region of the narrow coal pillar, the upper end of the second hollow anchor rod (3) is provided with a protruding pipe (301) penetrating into the protruding rod (201) at the upper end of the first hollow anchor rod (2), so as to form a tensile support for the central region of the narrow coal pillar to the fragile region on the outside; a push plate (5) and a support column (6), the push plate (5) is located on the wall surface of the narrow coal pillar, the support column (6) abuts against the outside of the push plate (5) to form a thrust support for the wall surface of the narrow coal pillar, and the inner and outer double support effects are formed by combining the pull rod (4) in the first hollow anchor rod (2) and the second hollow anchor rod (3).

2. The narrow coal pillar instability prevention and control supporting device according to claim 1, characterized in that: The upper end of the first hollow anchor rod (2) and the inner part of the protruding pipe (301) are respectively provided with a positioning hole (202) and a through hole for grouting, so as to fixedly connect the top of the first hollow anchor rod (2) and the second hollow anchor rod (3) with the stable region in the center of the narrow coal pillar.

3. The narrow coal pillar instability prevention and control supporting device according to claim 1, characterized in that: The upper end of the pull rod (4) is provided with a connecting rod (401) located in the first hollow anchor rod (2) and the second hollow anchor rod (3), and the lower end of the pull rod (4) is spirally provided with a spiral sleeve (402).

4. The narrow coal pillar instability prevention and control supporting device according to claim 1, characterized in that: The outer side of the push plate (5) is provided with a ring sleeve (502) sleeved on the outer side of the spiral sleeve (402), the outer side of the spiral sleeve (402) is provided with an outer ring block (403), and the outer ring block (403) is rotatably installed in the ring groove (503) on the inner side of the lower end of the ring sleeve (502).

5. The narrow pillar instability prevention and control supporting device according to claim 1, characterized in that: The two sides of the push plate (5) are provided with shaft seats (501) for penetrating the support column (6), so that the push plates (5) arranged above and below are arranged in order.

6. The narrow pillar instability prevention and control supporting device according to claim 1, characterized in that: The outer side of the support column (6) is provided with a limiting clamp (601) connected with the push plate (5), which is used for fixing the height position of the push plate (5), so that the push plate (5) remains stable and prevents deviation when the fragile region of the narrow coal pillar loosens.

7. The narrow pillar instability prevention and control supporting device according to claim 1, characterized in that: The intersection unit (7) is inclined and arranged above the transverse anchor hole at the bottom of the transverse anchor rod (1), so as to achieve the effect of the intersection of the two anchor holes (701).

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