Coal mine tunnel supporting device

Abstract

The utility model provides a coal mine tunnel supporting device which comprises a bottom supporting assembly and a top supporting assembly, the bottom supporting assembly comprises a first support and a second support, and the first support and the second support are arranged at intervals in the width direction of a tunnel. The top supporting assembly comprises an arc-shaped support and an arc-shaped grid mesh, the two ends of the arc-shaped support are connected with the first support and the second support respectively, the arc-shaped support is provided with an arc-shaped groove, and the arc-shaped groove is formed in the side, close to the top wall of the roadway, of the arc-shaped support. In a plane orthogonal to the thickness direction of the arc-shaped support, the section contour of the arc-shaped grid mesh is similar to the section contour of the arc-shaped groove, and at least part of the arc-shaped grid mesh is arranged in the arc-shaped groove. The coal mine roadway supporting device has the advantages of being large in contact area with the wall face of the roadway and good in supporting effect.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel support, in particular to a coal mine tunnel support device. Background Art

[0002] At present, the main source of coal mining is underground mining, which requires the excavation of a large number of tunnels underground. The tunnel support structure is used to keep the tunnel unobstructed and the surrounding rock stable. The basic purpose of tunnel support is to ease and reduce the movement of the surrounding rock, so that the tunnel section will not be excessively reduced, and at the same time prevent the scattered and damaged surrounding rock from falling. The support effect of the tunnel support structure depends not only on the supporting force of the structure itself, but also on a series of factors such as the surrounding rock properties, structural mechanical properties, structural installation quality, and the contact mode between the structure and the surrounding rock.

[0003] In the related technology, however, due to the unevenness of the tunnel surrounding rock, there is usually "point contact" between the tunnel surrounding rock and the support structure, which makes the support structure bear more concentrated force. The local stress points of the tunnel support structure will be easily damaged due to the increased force. In severe cases, the tunnel support structure will be deformed and unable to effectively support the tunnel surrounding rock, resulting in poor protection effect. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the utility model provides a coal mine tunnel support device, which has a large contact area with the tunnel surrounding rock and a good support effect.

[0005] The coal mine tunnel support device of the utility model embodiment comprises:

[0006] A bottom support assembly, the bottom support assembly comprising a first bracket and a second bracket, the first bracket and the second bracket being arranged at intervals along the width direction of the lane;

[0007] A top support assembly, the top support assembly includes an arc-shaped bracket and an arc-shaped grid, the two ends of the arc-shaped bracket are respectively connected to the first bracket and the second bracket, the arc-shaped bracket has an arc-shaped groove, the arc-shaped groove is opened on the side of the top wall of the arc-shaped bracket adjacent to the tunnel, in a plane orthogonal to the thickness direction of the arc-shaped bracket, the cross-sectional profile of the arc-shaped grid is similar to the cross-sectional profile of the arc-shaped groove, and at least a portion of the arc-shaped grid is placed in the arc-shaped groove.

[0008] In the coal mine tunnel support device of the embodiment of the utility model, an arc groove adapted to the tunnel top wall is opened at the top of the arc-shaped bracket, and an arc-shaped grid is arranged in the arc groove, so that when the top of the support device contacts the tunnel top wall, the arc-shaped grid contacts the uneven wall surface of the tunnel, providing an escape space for the raised part of the tunnel, increasing the contact area between the support device and the tunnel wall surface, avoiding the concentration of the force points of the support device, thereby reducing the damage of the support device caused by the increase of local force, and ensuring the support effect.

[0009] In some embodiments, there is a gap between the arc-shaped grid and the bottom wall of the arc-shaped groove in the thickness direction of the arc-shaped bracket.

[0010] In some embodiments, the top support assembly further includes a buffer protrusion, which is connected to the arc-shaped bracket and is located on a side of the arc-shaped bracket adjacent to the tunnel top wall, and the buffer protrusion is arranged along the circumference of the slot of the arc-shaped slot.

[0011] In some embodiments, the buffer protrusion is made of soft material.

[0012] In some embodiments, the coal mine tunnel support device of the utility model embodiment also includes an adjustment assembly, the adjustment assembly includes a first adjustment member and a second adjustment member, the first adjustment member connects the first bracket and the first end of the arc bracket, the second adjustment member connects the second bracket and the second end of the arc bracket, the first adjustment member includes a first adjustment part, the first adjustment part is movable relative to the first bracket along the height direction of the tunnel, the second adjustment member includes a second adjustment part, the second adjustment part is movable relative to the second bracket along the height direction of the tunnel.

[0013] In some embodiments, there are multiple first adjustment members, and the multiple first adjustment members are arranged at intervals along the width direction of the arc-shaped bracket;

[0014] There are a plurality of the second adjusting members, and the plurality of the second adjusting members are arranged at intervals along the thickness direction of the arc-shaped bracket.

[0015] In some embodiments, the coal mine tunnel support device of the utility model embodiment further includes a connecting assembly, the connecting assembly includes a connecting piece, a first extension piece and a second extension piece, the first extension piece and the second extension piece are both two, the two first extension pieces are respectively connected to the first bracket and the second bracket, the two second extension pieces are respectively connected to the two ends of the arc bracket,

[0016] There are multiple connecting members, at least one of which is used to connect the first extension member on the first bracket and the second extension member on the first end of the arc-shaped bracket, and at least one of which is used to connect the first extension member on the second bracket and the second extension member on the second end of the arc-shaped bracket.

[0017] In some embodiments, the first extension member has a plurality of first connection holes, which are arranged at intervals along the height direction of the alley, and the second extension member has a plurality of second connection holes, which are arranged at intervals along the height direction of the alley. In the height direction of the alley, at least one first connection hole corresponds to at least one second connection hole, so that at least part of the connection member fits in the first connection hole and the second connection hole.

[0018] In some embodiments, in the height direction of the lane, the distance between two adjacent first connection holes among the plurality of first connection holes gradually decreases from bottom to top.

[0019] The distance between two adjacent second connection holes among the plurality of second connection holes gradually decreases in a direction from bottom to top.

[0020] In some embodiments, the coal mine tunnel support device of the utility model embodiment also includes an anti-slip cone, and the bottom wall of the first bracket and the bottom wall of the second bracket are both provided with multiple anti-slip cones. In a plane orthogonal to the height direction of the tunnel, the cross-sectional area of ​​the anti-slip cone gradually decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a coal mine tunnel supporting device according to an embodiment of the utility model.

[0022] Figure 2 It is a partial structural schematic diagram of a coal mine tunnel supporting device according to an embodiment of the utility model.

[0023] Figure 3 It is a partial structural schematic diagram of a coal mine tunnel supporting device according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] 1. Bottom support assembly, 11. First bracket, 12. Second bracket,

[0026] 2. Top support assembly, 21. Arc bracket, 211. Arc groove, 22. Arc grid, 23. Buffer protrusion,

[0027] 3. Adjustment assembly, 31. First adjustment member, 32. Second adjustment member,

[0028] 4. Connecting assembly, 41. Connecting member, 42. First extending member, 421. First connecting hole, 43. Second extending member, 431. Second connecting hole,

[0029] 5. Anti-slip cone. DETAILED DESCRIPTION

[0030] 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 cannot be understood as limiting the present invention.

[0031] like Figure 1-Figure 3 As shown, the coal mine tunnel support device of the utility model embodiment includes a bottom support assembly 1 and a top support assembly 2, the bottom support assembly 1 includes a first bracket 11 and a second bracket 12, the first bracket 11 and the second bracket 12 are arranged along the width direction of the tunnel (such as Figure 1 The top support assembly 2 includes an arc-shaped bracket 21 and an arc-shaped grid 22. The two ends of the arc-shaped bracket 21 are connected to the first bracket 11 and the second bracket 12 respectively. The arc-shaped bracket 21 has an arc-shaped groove 211. The arc-shaped groove 211 is opened on the side of the top wall of the arc-shaped bracket 21 adjacent to the lane. In a plane orthogonal to the thickness direction of the arc-shaped bracket 21, the cross-sectional profile of the arc-shaped grid 22 is similar to the cross-sectional profile of the arc-shaped groove 211, and at least a part of the arc-shaped grid 22 is placed in the arc-shaped groove 211.

[0032] Specifically, Figure 1 and Figure 2 As shown, the bottom support assembly 1 is arranged on the bottom surface of the tunnel, that is, the lower ends of the first bracket 11 and the second bracket 12 can be fixed on the bottom surface of the tunnel to provide a support base for the top support assembly 2. The arc bracket 21 is located above the first bracket 11 and the second bracket 12, and the left and right ends of the arc bracket 21 are respectively connected to the upper end of the first bracket 11 and the upper end of the second bracket 12. The arc groove 211 is opened on the upper surface of the arc bracket 21, and the arc grid 22 is placed in the arc groove 211 to facilitate contact with the top wall of the tunnel.

[0033] It is understandable that if Figure 1 and Figure 2 As shown, the arc-shaped grid 22 can be installed in the arc-shaped groove 211. When the arc-shaped support 21 contacts the top wall of the tunnel, the grid on the arc-shaped grid 22 can provide avoidance space for the raised stones on the tunnel wall, avoiding the raised stones on the upper part of the tunnel from directly contacting the arc-shaped support 21, thereby reducing the "point contact" between the tunnel and the arc-shaped support 21, and the grid peripheral wall of the arc-shaped grid 22 can contact the raised circumferential part of the tunnel, increasing the contact area, thereby ensuring that the arc-shaped support 21 is subjected to more uniform force.

[0034] It should be noted that the arc-shaped grid 22 can be cross-arranged according to a certain spacing and cross bars and welded into a steel product with a square grid in the middle. According to the protrusion of the tunnel wall, arc-shaped grids 22 of different square sizes can be selected for support so as to better match the tunnel wall.

[0035] That is to say, in the coal mine tunnel support device of the embodiment of the utility model, an arc groove 211 adapted to the tunnel top wall is opened at the top of the arc bracket 21, and an arc grid 22 is arranged in the arc groove 211, so that when the top of the support device contacts the tunnel top wall, the arc grid 22 contacts the uneven wall surface of the tunnel, providing an escape space for the raised part of the tunnel, increasing the contact area between the support device and the tunnel wall surface, avoiding the concentration of the force points of the support device, thereby reducing the damage to the support device caused by the increase in local force, and ensuring the support effect.

[0036] In some embodiments, there is a gap between the arc-shaped grid 22 and the bottom wall of the arc-shaped groove 211 in the thickness direction of the arc-shaped bracket 21. It can be understood that Figure 1 and Figure 2 As shown, there is a certain gap between the arc grid 22 and the arc groove 211, which not only ensures that there is a certain buffer space when the arc grid 22 contacts the tunnel wall, but also provides space for the arc grid 22 to deform, and increases the distance between the tunnel wall and the arc bracket 21, further reducing the possibility of "point contact" between the arc bracket 21 and the tunnel wall.

[0037] In some embodiments, the top support assembly 2 further includes a buffer protrusion 23 , which is connected to the arc-shaped bracket 21 and is located on a side of the arc-shaped bracket 21 adjacent to the tunnel top wall. The buffer protrusion 23 is arranged circumferentially along the notch of the arc-shaped groove 211 .

[0038] Specifically, Figure 1 and Figure 2 As shown, the buffer protrusion 23 is provided on the upper surface of the arc bracket 21, and the buffer protrusion 23 is arranged around the notch of the arc groove 211. When the arc bracket 21 contacts the top wall of the lane, the arc protrusion can contact the wall surface of the lane relative to the arc grid 22, thereby playing a buffering role.

[0039] Preferably, the buffer protrusion 23 is made of a soft material. It is understandable that, since the buffer protrusion 23 contacts the tunnel wall earlier than the arc-shaped grid 22, the buffer protrusion 23 is made of a soft material, which not only can play a buffering role, but also increases the contact area between the buffer protrusion 23 and the tunnel wall when the buffer protrusion 23 contacts and deforms with the tunnel wall, thereby improving the stability of the support device.

[0040] It should be noted that the buffer protrusion 23 can be made of rubber material, or made of soft plastic material such as polyvinyl chloride.

[0041] In some embodiments, the coal mine tunnel support device of the utility model embodiment further includes an adjustment assembly 3, the adjustment assembly 3 includes a first adjustment member 31 and a second adjustment member 32, the first adjustment member 31 connects the first bracket 11 and the first end of the arc bracket 21, the second adjustment member 32 connects the second bracket 12 and the second end of the arc bracket 21, the first adjustment member 31 includes a first adjustment portion, the first adjustment portion is relative to the first bracket 11 along the height direction of the tunnel (such as Figure 1 The second adjusting member 32 includes a second adjusting portion, and the second adjusting portion is movable relative to the second bracket 12 along the height direction of the lane.

[0042] Specifically, Figure 1 As shown, the first adjusting member 31 connects the arc bracket 21 and the first bracket 11 and is used to adjust the distance between the arc bracket 21 and the first bracket 11, and the second adjusting member 32 connects the arc bracket 21 and the second bracket 12 and is used to adjust the distance between the arc bracket 21 and the second bracket 12. In other words, the adjusting assembly 3 can be a retractable device such as a cylinder or an oil cylinder, that is, the retractable shaft of the cylinder or the oil cylinder is the first adjusting part and the second adjusting part, which are used to drive the arc bracket 21 to move.

[0043] In addition, if Figure 1 As shown, the adjustment component 3 can also be a stud, and a nut is welded to the middle section of the stud. Taking the first bracket 11 as an example, threaded holes are provided on the top of the first bracket 11 and the bottom of the left end between the arcs. The two ends of the stud are respectively connected to the threaded holes on the first bracket 11 and the arc bracket 21. Then, by using a wrench or other tool to rotate the nut on the stud, the distance between the stud and the first bracket 11 and the arc bracket 21 is changed, thereby realizing the function of adjusting the distance between the arc bracket 21 and the first bracket 11. Similarly, the second bracket 12 and the arc bracket 21 can also be connected and adjusted by the stud. This is to reduce the overall production cost of the coal mine tunnel support device of the embodiment of the utility model.

[0044] Preferably, there are multiple first adjustment members 31 , which are arranged at intervals along the width direction of the arc-shaped bracket 21 ; there are multiple second adjustment members 32 , which are arranged at intervals along the thickness direction of the arc-shaped bracket 21 .

[0045] Specifically, Figure 1As shown, there are two first adjustment members 31, which are symmetrically arranged at the top of the first bracket 11 along the front-to-back direction, and there are two second adjustment members 32, which are symmetrically arranged at the top of the second bracket 12 along the front-to-back direction, so as to make the adjustment process more stable and improve the overall supporting strength.

[0046] In some embodiments, the coal mine tunnel support device of the utility model embodiment also includes a connecting component 4, the connecting component 4 includes a connecting piece 41, a first extension piece 42 and a second extension piece 43, there are two first extension pieces 42 and second extension pieces 43, the two first extension pieces 42 are respectively connected to the first bracket 11 and the second bracket 12, the two second extension pieces 43 are respectively connected to the two ends of the arc bracket 21, there are multiple connecting pieces 41, at least one connecting piece 41 is used to connect the first extension piece 42 on the first bracket 11 and the second extension piece 43 on the first end of the arc bracket 21, and at least one connecting piece 41 is used to connect the first extension piece 42 on the second bracket 12 and the second extension piece 43 on the second end of the arc bracket 21.

[0047] Specifically, Figure 1 and Figure 2 As shown, the tops of the first bracket 11 and the second bracket 12 are both connected to the first extension piece 42, and the two ends of the arc bracket 21 are both connected to the second extension piece 43. The upper end of the first extension piece 42 on the first bracket 11 overlaps with the lower end of the second extension piece 43 at the left end of the arc bracket 21 in the vertical direction, so that the connecting piece 41 can connect the first extension piece 42 and the second extension piece 43. Similarly, the upper end of the first extension piece 42 on the second bracket 12 overlaps with the lower end of the second extension piece 43 at the right end of the arc bracket 21 in the vertical direction, so that the connecting piece 41 can connect the first extension piece 42 and the second extension piece 43.

[0048] It is understandable that if Figure 1 and Figure 2 As shown, the first extension piece 42 and the second extension piece 43 can be arranged in an overlapping manner in the left-right direction; or, the first extension piece 42 and the second extension piece 43 can be connected by plugging (not shown in the figure). The connecting piece 41 can be a pin, a stud, etc., and correspondingly, the first extension piece 42 and the second extension piece are provided with correspondingly arranged pin holes and screw holes.

[0049] In some embodiments, the first extension member 42 has a plurality of first connection holes 421, and the plurality of first connection holes 421 are spaced along the height direction of the lane (eg Figure 1The second extension piece 43 has a plurality of second connection holes 431, and the plurality of second connection holes 431 are arranged at intervals along the height direction of the alley. In the height direction of the alley, at least one first connection hole 421 corresponds to at least one second connection hole 431, so that at least part of the connection piece 41 fits in the first connection hole 421 and the second connection hole 431.

[0050] Specifically, Figure 1 and Figure 2 As shown, when the height adjustment of the arc bracket 21 is completed by using the adjustment component 3, the first connecting hole 421 on the first extension member 42 corresponds to the second connecting hole 431 on the second extension member 43, so that one end of the connecting member 41 can pass through the first connecting hole 421 and cooperate with the second connecting hole 431, thereby connecting the first extension member 42 and the second extension member 43.

[0051] Preferably, in the height direction of the lane, the distance between two adjacent first connection holes 421 among the multiple first connection holes 421 gradually decreases from bottom to top, and the distance between two adjacent second connection holes 431 among the multiple second connection holes 431 gradually decreases from bottom to top.

[0052] Specifically, Figure 3 As shown, in the direction from bottom to top, the distance between two adjacent first connection holes 421 among the plurality of first connection holes 421 is a, b, c, respectively, and a>b>c. It can be understood that when the height of the arc bracket 21 is adjusted by the adjustment component 3, after the arc bracket 21 contacts the tunnel wall, the movable distance of the arc bracket 21 becomes smaller and smaller. Therefore, the distance between two adjacent first connection holes 421 among the plurality of first connection holes 421 is gradually reduced in the direction from bottom to top, which can ensure that the first connection hole 421 corresponds to the second connection hole 431 as much as possible, thereby facilitating the installation of the connection member 41 to enhance the support strength.

[0053] In some embodiments, the coal mine tunnel support device of the utility model embodiment also includes anti-slip cones 5. The bottom wall of the first bracket 11 and the bottom wall of the second bracket 12 are both provided with multiple anti-slip cones 5. In a plane orthogonal to the height direction of the tunnel, the cross-sectional area of ​​the anti-slip cones 5 gradually decreases.

[0054] Specifically, Figure 1 As shown, the anti-skid cone 5 is arranged on the bottom surface of the first bracket 11 and the second bracket 12, so that when the first bracket 11 and the second bracket 12 are in contact with the tunnel ground, the anti-skid cone 5 can penetrate into the ground to reduce the possibility of displacement of the first bracket 11 and the second bracket 12 and improve the stability of the support device.

[0055] It can be understood that the anti-slip cone 5 can be a cone or a pyramid, and the cross-sectional area of ​​the anti-slip cone 5 gradually decreases from top to bottom so as to facilitate penetration into the ground of the tunnel.

[0056] 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 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A coal mine tunnel support device, characterized in that: include: A bottom support assembly, the bottom support assembly comprising a first bracket and a second bracket, the first bracket and the second bracket being arranged at intervals along a width direction of the lane; A top support assembly, the top support assembly includes an arc-shaped bracket and an arc-shaped grid, the two ends of the arc-shaped bracket are respectively connected to the first bracket and the second bracket, the arc-shaped bracket has an arc-shaped groove, the arc-shaped groove is opened on the side of the top wall of the arc-shaped bracket adjacent to the tunnel, in a plane orthogonal to the thickness direction of the arc-shaped bracket, the cross-sectional profile of the arc-shaped grid is similar to the cross-sectional profile of the arc-shaped groove, and at least a portion of the arc-shaped grid is placed in the arc-shaped groove.

2. The coal mine tunnel support device according to claim 1, characterized in that: In the thickness direction of the arc-shaped bracket, there is a gap between the arc-shaped grid and the bottom wall of the arc-shaped groove.

3. The coal mine tunnel support device according to claim 2, characterized in that: The top support assembly also includes a buffer protrusion, which is connected to the arc-shaped bracket and is located on a side of the arc-shaped bracket adjacent to the tunnel top wall. The buffer protrusion is arranged along the circumference of the notch of the arc-shaped groove.

4. The coal mine tunnel support device according to claim 3, characterized in that: The buffer protrusion is made of soft material.

5. The coal mine tunnel support device according to claim 1, characterized in that: It also includes an adjustment component, which includes a first adjustment member and a second adjustment member, the first adjustment member connects the first bracket and the first end of the arc bracket, the second adjustment member connects the second bracket and the second end of the arc bracket, the first adjustment member includes a first adjustment part, the first adjustment part is movable relative to the first bracket along the height direction of the lane, and the second adjustment member includes a second adjustment part, the second adjustment part is movable relative to the second bracket along the height direction of the lane.

6. The coal mine tunnel support device according to claim 5, characterized in that: There are a plurality of first adjusting members, and the plurality of first adjusting members are arranged at intervals along the width direction of the arc-shaped bracket; There are a plurality of second adjusting members, and the plurality of second adjusting members are arranged at intervals along the thickness direction of the arc-shaped bracket.

7. The coal mine tunnel support device according to claim 6, characterized in that: It also includes a connecting component, the connecting component includes a connecting piece, a first extending piece and a second extending piece, the first extending piece and the second extending piece are both two, the two first extending pieces are respectively connected to the first bracket and the second bracket, and the two second extending pieces are respectively connected to two ends of the arc bracket, There are multiple connecting members, at least one of which is used to connect the first extension member on the first bracket and the second extension member on the first end of the arc-shaped bracket, and at least one of which is used to connect the first extension member on the second bracket and the second extension member on the second end of the arc-shaped bracket.

8. The coal mine tunnel support device according to claim 7, characterized in that: The first extension member has a plurality of first connection holes, which are arranged at intervals along the height direction of the lane; the second extension member has a plurality of second connection holes, which are arranged at intervals along the height direction of the lane; in the height direction of the lane, at least one first connection hole corresponds to at least one second connection hole, so that at least part of the connection member fits in the first connection hole and the second connection hole.

9. The coal mine tunnel support device according to claim 8, characterized in that: In the height direction of the lane, the distance between two adjacent first connection holes among the plurality of first connection holes gradually decreases from bottom to top. The distance between two adjacent second connection holes among the plurality of second connection holes gradually decreases in a direction from bottom to top.

10. The coal mine tunnel support device according to any one of claims 1 to 9, characterized in that: It also includes anti-skid cones. The bottom wall of the first bracket and the bottom wall of the second bracket are both provided with a plurality of anti-skid cones. In a plane orthogonal to the height direction of the laneway, the cross-sectional area of ​​the anti-skid cones gradually decreases.

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