Grouting anchor rod for monitoring looseness in coal seam
By filling foam strips between the indicator belt of the grouting anchor and the outer wall of the anchor rod, effective monitoring of looseness within the coal seam is achieved, solving the problem of the inability to monitor internal misalignment and slippage of the coal seam in the prior art, and improving safety .
Patent Information
- Application Number
- CN202421111938.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-21
AI Technical Summary
When existing grouting anchors are partially loose inside the coal seam, they lead to misalignment and slippage, they cannot be effectively monitored and warned, resulting in safety hazards.
A grouting anchor rod is designed to monitor looseness in the coal seam. By filling foam strips between the indicator belt and the outer wall of the anchor rod, the internal misalignment and shearing of the coal seam can be indicated by changes in the position of the indicator strip to improve monitoring capabilities.
Through the change of the position of the indicator bar, the looseness inside the coal seam can be effectively monitored, and the monitoring capacity of looseness inside the coal seam is improved and safety is ensured.
Smart Images
Figure CN222296271U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of grouting anchor rods, in particular to a grouting anchor rod for monitoring the looseness inside a coal seam. Background Art
[0002] When mining coal seams, tunnels need to be built through the coal seams. Therefore, not only the side walls need to be supported, but also the top coal of the "top coal section" at the top of the tunnel needs to be supported, especially for loose coal seams or three soft coal seams. Otherwise, there will be the danger of separation and caving, and even cause the upper rock layer to separate, which will cause greater harm. Therefore, in the prior art, support structures such as anchor rods, anchor cables, anchor nets and guard plates are generally used to anchor and support the top coal seam.
[0003] Existing grouting anchors can consolidate loose coal seams and anchor surrounding coal seams at the same time. However, when local loosening occurs inside the coal seam, causing dislocation and slippage inside the coal seam, it cannot be well observed outside the coal seam and cannot serve as a warning. Utility Model Content
[0004] In order to solve the problem in the prior art that the outside of the coal seam cannot serve as a warning when dislocation and slippage occur inside the coal seam due to local loosening inside the coal seam, the utility model provides a grouting anchor for monitoring loosening inside the coal seam. The grouting anchor fills a foam strip between the indicator band and the outer wall of the anchor rod body, so that dislocation and shearing inside the coal seam can be indicated by changes in the position of the indicator strip, thereby improving the monitoring capability of loosening inside the coal seam.
[0005] The utility model adopts the following technical solution to solve the above-mentioned technical problems: a grouting anchor for monitoring the looseness inside a coal seam, comprising an anchor rod body and a drill bit at one end thereof, a grouting channel penetrating the drill bit is provided in the anchor rod body, a sealing bag is sleeved on the other end of the anchor rod body, a plurality of indicator bands are arranged around the outer wall of the anchor rod body, one end of the indicator band is connected to the outer wall of the anchor rod body, and the other end passes through a through hole on the sealing bag and extends out of the drill hole on the coal seam, and a foam strip is filled between each indicator band and the outer wall of the anchor rod body.
[0006] As a further optimization of the grouting anchor rod for monitoring the looseness inside the coal seam of the utility model: a plurality of protrusions are arranged on the indicator belt along its length direction, and the outer edges of all the protrusions are located on the same cylindrical surface.
[0007] As a further optimization of the grouting anchor rod for monitoring the looseness inside a coal seam according to the utility model: the outer wall of the anchor rod body is provided with a receiving groove extending along the length direction thereof, and the foam strip is arranged in the receiving groove.
[0008] As a further optimization of the utility model, a grouting anchor for monitoring the looseness inside a coal seam is provided: the anchor rod body is a hollow structure, the inner wall of the anchor rod body is provided with a plurality of positioning grooves along its length direction, an inner support body is passed through the anchor rod body, and the surface of the inner support body is provided with positioning blocks that cooperate with the positioning grooves, and the gap between the inner support body and the inner wall of the anchor rod body forms the grouting channel.
[0009] As a further optimization of the grouting anchor for monitoring the looseness inside a coal seam according to the utility model: the outer wall of the inner support body is provided with a spiral support plate along its length direction, and the outer edge of the support plate contacts the inner wall of the anchor body.
[0010] As a further optimization of the grouting anchor rod for monitoring the looseness inside the coal seam of the utility model: the spiral support plate is arranged in multiple sections, there are gaps between the support plates of adjacent sections and the spiral directions are opposite.
[0011] As a further optimization of the utility model of a grouting anchor for monitoring internal looseness of a coal seam: the outer wall of the inner support body is inclinedly provided with a plurality of fan-shaped anti-shear plates along its length direction, and the outer end faces of the anti-shear plates are in contact with the inner wall of the anchor rod body.
[0012] As a further optimization of the grouting anchor rod for monitoring the looseness inside the coal seam of the utility model: the angle between the anti-shear plate and the axial direction is 120° to 160°.
[0013] As a further optimization of the utility model of a grouting anchor for monitoring the looseness inside a coal seam: a pad is provided on the portion of the anchor rod body outside the drill hole, a through groove is opened on the pad for the indicator belt to pass through, and the length direction of the through groove is consistent with the deformation direction of the foam strip.
[0014] As a further optimization of the utility model of a grouting anchor for monitoring the looseness inside a coal seam: a connecting ring is sleeved on the anchor rod body, and the indicator strip is connected to the outer wall of the anchor rod body through the connecting ring.
[0015] Beneficial effects: The utility model fills a foam strip between the indicator strip and the outer wall of the anchor rod body, so that the dislocation and shearing inside the coal seam can be indicated by the change of the position of the indicator strip, thereby improving the monitoring capability of looseness inside the coal seam;
[0016] A plurality of protrusions are arranged in the length direction of the indicator belt, and the outer edges of all the protrusions are located on the same cylindrical surface, so that the coal seam can be squeezed more quickly after the internal dislocation and shearing of the coal seam, so that the position of the indicator belt changes;
[0017] An accommodating groove extending along the length direction of the anchor rod body is provided on the outer wall thereof, and the foam strip is arranged in the accommodating groove, so as to ensure that the foam strip can be conveniently installed and at the same time give the indicator belt a relatively large activity space;
[0018] An inner support body is passed through the grouting channel of the anchor rod body, and a spiral support plate or an inclined fan-shaped anti-shear plate is provided on the surface of the inner support body, which improves the shear strength of the anchor rod body. When dislocation and slippage occur inside the coal seam, the anchor rod body is not easy to break. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the utility model;
[0020] Figure 2 It is a partial enlarged view of the utility model;
[0021] Figure 3 It is a schematic diagram of the spiral plate setting method;
[0022] Figure 4 It is a schematic diagram of the overall structure of a grouting anchor with a spiral plate;
[0023] Figure 5 It is a schematic diagram of the setting method of the shear plate;
[0024] Figure 6 It is a schematic diagram of the overall structure of a grouting anchor with a shear plate;
[0025] Figure numerals: 1. anchor rod body, 101. drill bit, 102. sealing bag, 103. pad, 104. grouting channel, 105. positioning groove, 106. receiving groove, 2. indicator belt, 201. protrusion, 202. foam strip, 203. connecting ring, 3. coal seam, 4. drill hole, 5. inner support body, 501. support plate, 502. positioning block, 503. anti-shear plate. DETAILED DESCRIPTION
[0026] The technical solution of the present invention is further elaborated in detail below in conjunction with specific embodiments. The parts that are not described and disclosed in detail in the following embodiments of the present invention should be understood as the existing technologies known or should be known to those skilled in the art, such as the material and model of the anchor rod body 1, the material and model of the sealing bag 102 and the specific working principle, how to grout into the anchor rod body 1, the material, structure and model of the drill bit 101, etc.
[0027] Example 1
[0028] A grouting anchor for monitoring looseness inside coal seams, such as Figure 1 and Figure 2As shown, it includes an anchor rod body 1 and a drill bit 101 at one end thereof. The length of the anchor rod body 1 is 2m-3m. A grouting channel 104 penetrating the drill bit 101 is provided in the anchor rod body 1. Subsequently, the grouting channel 104 in the anchor rod body 1 is grouted, and the slurry is discharged from the drill bit 101 into the borehole 4. A sealing bag 102 is sleeved on the other end of the anchor rod body 1. The outer surface of the sealing bag 102 can fit with the inner wall of the borehole 4, so as to prevent the slurry from leaking out of the borehole 4. A plurality of indicator strips 2 are arranged around the outer wall of the anchor rod body 1. One end of the indicator strip 2 is connected to the inner wall of the borehole 4. The outer wall of the anchor rod body 1 is connected, and the other end passes through the through hole on the sealing bag 102 and then extends out of the borehole 4 on the coal seam 3. The thickness of the indicator tape 2 can be set at 0.3cm-0.6cm, preferably at 0.4cm. The length of the portion of the indicator tape 2 extending out of the borehole 4 can be set at 1cm-5m, preferably at 2cm. In order to make the indicator tape 2 easier to observe, the end surface of the portion of the indicator tape 2 extending out of the borehole 4 can be painted. The number of indicator tapes 2 can be set to four, and the four indicator tapes 2 are evenly distributed around the outer wall of the anchor rod body 1, and the indicator tape 2 is set to a metal tape. Each indicator band 2 and the outer wall of the bolt rod body 1 are filled with a foam strip 202, the foam strip 202 can be set as a long section, or can be set as several sections, there is a certain gap between each section of the foam strip 202, the height of the foam strip 202 is set to 0.4cm-0.6cm, preferably 0.5cm, when the bolt rod body 1 is placed in the borehole 4 on the coal seam 3 for grouting, due to the presence of the foam strip 202, the foam strip 202 will occupy a certain space, so that the slurry cannot completely fill the indicator band 2 and the outer wall of the bolt rod body 1. When the slurry solidifies, once the coal seam 3 is dislocated and shears and squeezes the indicating belt 2, causing the indicating belt 2 to move. Due to its own material, the sealing bag 102 itself has a certain deformation ability when the indicating belt 2 moves, which will not affect the function of the indicating belt 2. When the indicating belt 2 moves, the indicating belt 2 located at or close to this part will squeeze the foam strip 202 to deform it, so that the part of the indicating belt 2 extending outside the borehole 4 will also be offset. The construction personnel can know that the inside of the coal seam 3 is loosened by observing the changes in the indicating belt 2, thereby improving the monitoring ability of the looseness inside the coal seam 3.
[0029] It should be noted that the foam strip 202 is filled between the indicator band 2 and the outer wall of the anchor rod body 1 and occupies a certain space. When the slurry is discharged from the borehole 4 and enters between the outer wall of the anchor rod body 1 and the inner wall of the borehole 4, the slurry adheres to and solidifies on the surface of the foam strip 202 without destroying the structure of the foam strip 202. When deformation occurs inside the coal seam 2, the indicator band 2 will be squeezed, and then the indicator band 2 presses the foam strip 202 to crush the foam strip 202 and the solidified slurry together. Finally, the position of the indicator band 2 is changed, which has an indication effect.
[0030] The above is a basic implementation method of the utility model, which can be further improved, optimized and limited on the basis of the above to obtain the following embodiments:
[0031] Example 2
[0032] This embodiment is an improved solution based on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 1 and Figure 2 As shown, a plurality of protrusions 201 are provided on the indicator belt 2 along its length direction, the outer edges of all the protrusions 201 are located on the same cylindrical surface, the height of the protrusions 201 is set between 0.1 cm and 0.3 cm, preferably set to 0.2 cm, when the anchor rod body 1 is inserted into the borehole 4 on the coal seam 3, all the protrusions 201 can be against the inner wall of the borehole 4, so that when dislocation or slippage occurs inside the coal seam 3, the protrusions 201 can be squeezed in advance to move the indicator belt 2.
[0033] Example 3
[0034] This embodiment is an improved solution based on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 3-Figure 6 As shown, the foam strip 202 can be filled between the outer wall of the anchor rod body 1 and the indicator band 2, but the gap between the outer wall of the anchor rod body 1 and the drill hole 4 is small. Therefore, in order not to affect the use of the indicator band 2, a receiving groove 106 extending along its length direction is opened on the outer wall of the anchor rod body 1. The thickness of the receiving groove 106 is set to one third to one half of the difference between the outer diameter and the inner diameter of the anchor rod body 1. The foam strip 202 is arranged in the receiving groove 106, which can save space for installing the foam strip 202 and provide a relatively large range for the movement of the indicator band 2.
[0035] Example 4
[0036] This embodiment is an improved solution based on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 3 As shown, the anchor rod body 1 is a hollow structure, and the inner wall of the anchor rod body 1 is provided with a plurality of positioning grooves 105 along its length direction. An inner support body 5 is passed through the anchor rod body 1, and a positioning block 502 cooperating with the positioning groove 105 is provided on the surface of the inner support body 5. The number of the plurality of positioning grooves 105 provided is at least two, and the two positioning grooves 105 are symmetrically distributed along the axial direction of the anchor rod body 1, so that when the positioning block 502 extends into the positioning groove 105, it can ensure that the inner support body 5 is stable in the circumferential direction and radial direction inside the grouting channel 104. If the number of positioning grooves 105 provided is three or more, it is sufficient to ensure that the positioning grooves 105 are evenly distributed on the inner wall of the anchor rod body 1, and the gap between the inner support body 5 and the inner wall of the anchor rod body 1 forms the grouting channel 104.
[0037] Example 5
[0038] This embodiment is an improved solution based on the embodiment 4. Its main structure is the same as that of the embodiment 4. The improvement is as follows: Figure 4 As shown, in order to further strengthen the stabilizing effect of the anchor rod body 1, increase the anti-shearing ability of the anchor rod body 1, and extend the service life of the anchor rod body 1, the outer wall of the inner support body 5 is provided with a spiral support plate 501 along its length direction, and the outer edge of the support plate 501 contacts the inner wall of the anchor rod body 1, and the spiral support plate 501 is arranged in multiple sections, and there are cavities between the support plates 501 of adjacent sections and the spiral directions are opposite. The support plate 501 can be made of a rigid material, and the thickness is set to 2cm-3cm, preferably 2.5cm. The specific anti-shearing working principle is the existing technology in this field, and will not be described in detail here.
[0039] Example 6
[0040] This embodiment is an improved solution based on the embodiment 4. Its main structure is the same as that of the embodiment 4. The improvement is as follows: Figure 5 As shown, the outer wall of the inner support body 5 is obliquely provided with a plurality of fan-shaped anti-shear plates 503 along its length direction. The anti-shear plates 503 may be staggered, that is, adjacent anti-shear plates 503 may not be located on the same side, or may all be arranged on the same side. The outer end surface of the anti-shear plate 503 contacts the inner wall of the anchor rod body 1. The angle between the anti-shear plate 503 and the axial direction is 120° to 160°, preferably set to 140°. The anti-shear plate 503 may be inclined toward the outside of the borehole 4, or may be inclined toward the drill bit 101.
[0041] Example 7
[0042] This embodiment is an improved solution based on the embodiment 1. Its main structure is the same as that of the embodiment 1. The improvement is as follows: Figure 1 As shown, the portion of the anchor rod body 1 outside the borehole 4 is provided with a pad 103. After the pad 103 is connected to the anchor rod, the pad 103 is fixed to the coal seam 3 to enhance the support effect. A through slot is provided on the pad 103 for the indicator band 2 to pass through. The length of the through slot is greater than the height of the foam strip 202. The length direction of the through slot is consistent with the deformation direction of the foam strip 202. Dislocation and shearing occur inside the coal seam 3, so that the indicator band 2 moves in the through slot after being squeezed and deformed. If the length direction of the through slot is inconsistent with the deformation direction of the foam strip 202, the movement of the indicator band 2 will be restricted. In order to facilitate the connection between the indicator band 2 and the outer wall of the anchor rod body 1, a connecting ring 203 is sleeved on the anchor rod body 1, and the indicator band 2 is connected to the outer wall of the anchor rod body 1 through the connecting ring 203.
[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A grouting anchor for monitoring looseness inside a coal seam, comprising an anchor rod body (1) and a drill bit (101) at one end thereof, a grouting channel (104) penetrating the drill bit (101) being provided in the anchor rod body (1), and a sealing bag (102) being provided at the other end of the anchor rod body (1), characterized in that: A plurality of indicator bands (2) are arranged around the outer wall of the anchor rod body (1), one end of the indicator band (2) is connected to the outer wall of the anchor rod body (1), and the other end passes through a through hole in the sealing bag (102) and extends out of a drill hole (4) in the coal seam (3), and a foam strip (202) is filled between each indicator band (2) and the outer wall of the anchor rod body (1).
2. The grouting anchor for monitoring the looseness inside the coal seam according to claim 1, characterized in that: The indicator strip (2) is provided with a plurality of protrusions (201) along its length direction, and the outer edges of all the protrusions (201) are located on the same cylindrical surface.
3. The grouting anchor for monitoring the looseness inside the coal seam according to claim 1, characterized in that: The outer wall of the anchor rod body (1) is provided with a receiving groove (106) extending along its length direction, and the foam strip (202) is arranged in the receiving groove (106).
4. The grouting anchor for monitoring the looseness inside the coal seam according to claim 1, characterized in that: The anchor rod body (1) is a hollow structure, the inner wall of the anchor rod body (1) is provided with a plurality of positioning grooves (105) along its length direction, an inner support body (5) is passed through the anchor rod body (1), a positioning block (502) cooperating with the positioning grooves (105) is provided on the surface of the inner support body (5), and the gap between the inner support body (5) and the inner wall of the anchor rod body (1) forms the grouting channel (104).
5. The grouting anchor for monitoring the looseness inside the coal seam according to claim 4, characterized in that: The outer wall of the inner support body (5) is provided with a spiral support plate (501) along its length direction, and the outer edge of the support plate (501) is in contact with the inner wall of the anchor rod body (1).
6. The grouting anchor for monitoring the looseness inside the coal seam according to claim 5, characterized in that: The spiral support plate (501) is arranged in multiple sections, and there is a gap between the support plates (501) in adjacent sections and the spiral directions are opposite.
7. The grouting anchor for monitoring the looseness inside the coal seam according to claim 4, characterized in that: The outer wall of the inner support body (5) is provided with a plurality of fan-shaped anti-shear plates (503) obliquely along its length direction, and the outer end surfaces of the anti-shear plates (503) are in contact with the inner wall of the anchor rod body (1).
8. The grouting anchor for monitoring the looseness inside the coal seam according to claim 7, characterized in that: The angle between the anti-shear plate (503) and the axial direction is 120° to 160°.
9. The grouting anchor for monitoring the looseness inside the coal seam according to claim 1, characterized in that: A pad (103) is provided at the portion of the anchor rod body (1) located outside the drill hole (4), and a through slot is provided on the pad (103) for the indicator band (2) to pass through, wherein the length direction of the through slot is consistent with the deformation direction of the foam strip (202).
10. The grouting anchor for monitoring the looseness inside the coal seam according to claim 1, characterized in that: A connecting ring (203) is sleeved on the anchor rod body (1), and the indicating band (2) is connected to the outer wall of the anchor rod body (1) via the connecting ring (203).