Coal mine goaf roadway supporting device and construction method

Abstract

The invention belongs to the technical field of gob-side roadway supporting, and particularly relates to a coal mine gob roadway supporting device and a construction method.The coal mine gob roadway supporting device comprises a cross beam, the bottom of the cross beam is in transmission connection with a plurality of lifting devices, and the bottom ends of the lifting devices are slidably arranged in sliding rails; a plurality of variable-angle supporting devices are symmetrically and fixedly connected to the top of the cross beam; the variable-angle supporting device comprises a rotating seat and a sliding seat, the rotating seat is in sliding connection with the sliding seat through an arc-shaped groove, the sliding seat is fixedly connected to the cross beam, and elastic supporting parts are arranged at the two ends of the rotating seat respectively. Through the arrangement of the rotating base and the sliding base, the supporting face can be matched with the inclination angle of the top of the roadway, the effective supporting area of the top of the roadway is increased, stable supporting is achieved, safety is improved, and interface deformation is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of goaf-side tunnel support, and in particular relates to a goaf-side tunnel support device and a construction method. Background Art

[0002] Gob-side tunnel refers to the maintenance of the original mining tunnel along the edge of the gob behind the coal mining face. It uses certain technical means to re-support the tunnel of the previous section and leave it for the next section. It is a method of pillarless mining technology. Gob-side tunnel can maximize resource recovery and avoid coal loss.

[0003] When supporting the goaf-side tunnel, anchor support and gantry support are generally used. Anchor support directly drives the anchor into the goaf-side tunnel, which makes it difficult to remove and inconvenient to install. The gantry support solves the problem of inconvenient installation. During installation, multiple gantry supports are transported to the goaf-side tunnel for support through a transfer device, and the support method adopts symmetrical support to make the top of the goaf-side tunnel bear the same force. However, the top of the goaf-side tunnel is uneven when mining the working face, and the use of symmetrical support will result in poor support effect. Therefore, a coal mine goaf tunnel support device and construction method are urgently needed to solve the problem. Summary of the invention

[0004] The purpose of the present invention is to provide a coal mine goaf tunnel support device and a construction method to solve the above problems.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A coal mine goaf tunnel support device, comprising: a crossbeam, the bottom of the crossbeam is transmission-connected with a plurality of lifting devices, the bottom end of the lifting device is slidably arranged in a slide rail, and the top of the crossbeam is symmetrically fixed with a plurality of variable angle support devices;

[0007] The variable angle support device comprises a rotating seat and a sliding seat. The rotating seat is slidably connected to the sliding seat via an arc-shaped groove. The sliding seat is fixed on the crossbeam. Both ends of the rotating seat are respectively provided with elastic support parts.

[0008] Preferably, the elastic support portion comprises a ball-jointed connecting rod spherically hinged to one end of the rotating seat, and the ball-jointed connecting rod is at least one, and a plurality of the ball-jointed connecting rods are vertically slidably connected to the same horizontal slider, and baffles are slidably connected to both ends of the horizontal slider, and the baffles are respectively fixed to the front and rear sides of the beam;

[0009] The bottom end of the ball joint connecting rod is axially connected with a flexible support portion;

[0010] The outer sleeve of the ball joint connecting rod is provided with a second elastic part, and the second elastic part is located between the rotating seat and the horizontal sliding block.

[0011] Preferably, the second elastic part includes a second spring, and the second spring is coaxially sleeved on the outer side of the corresponding ball joint connecting rod, the top end of the second spring is fixedly connected to the rotating seat, and the bottom end of the second spring is fixedly connected to the horizontal sliding block.

[0012] Preferably, the flexible support portion comprises a rubber block, the top of the rubber block is axially connected to the bottom end of the ball joint connecting rod, and the bottom of the rubber block is in contact with the surface of the sliding seat.

[0013] Preferably, a first arc-shaped friction strip matching its curvature is embedded on the arc surface of the bottom of the rotating seat, the first arc-shaped friction strip is frictionally matched with a second arc-shaped friction strip, the second arc-shaped friction strip is embedded in the arc-shaped groove, and the second arc-shaped friction strip matches the curvature of the arc-shaped groove.

[0014] Preferably, the lifting device comprises a hydraulic lifting rod, the top of the hydraulic lifting rod is fixedly connected to the bottom of the beam, and the bottom of the hydraulic lifting rod is slidably connected to the slide rail.

[0015] Preferably, a first set of plates is coaxially sleeved on the middle outer portion of the fixed end of the hydraulic lifting rod, the first set of plates is fixedly connected to the fixed end of the hydraulic lifting rod, and a second set of plates is vertically slidably matched at the bottom end of the hydraulic lifting rod, and both ends of the second set of plates are slidably arranged on the slide rail through first slide grooves, and two of the first slide grooves are opened on the inner walls on both sides of the slide rail;

[0016] A first elastic portion is provided between the first set of plates and the second set of plates; the first elastic portion is sleeved on the outside of the hydraulic lifting rod;

[0017] A friction part is fixedly connected to the bottom end of the hydraulic lifting rod, and a friction plate is frictionally matched with the friction part. The friction plate is arranged along the length direction of the slide rail, and the friction plate is fixedly connected to the inner wall of the bottom of the slide rail.

[0018] Preferably, the first elastic part includes a first spring, which is coaxially sleeved on the outside of the hydraulic lifting rod, the top end of the first spring is fixedly connected to the bottom end of the first sleeve plate, and the bottom end of the first spring is fixedly connected to the top end of the second sleeve plate.

[0019] Preferably, the friction portion includes a friction pattern formed at the bottom of the fixed end of the hydraulic lifting rod, and the friction pattern is frictionally matched with the friction plate.

[0020] A construction method of a coal mine goaf tunnel support device, based on the above-mentioned coal mine goaf tunnel support device, comprises the following steps:

[0021] Step 1: spraying a shotcrete layer on the inner side of the tunnel top;

[0022] Step 2: Move the lifting device via the slide rail to move the crossbeam to a specified position;

[0023] Step 3: lift the beams simultaneously by means of a plurality of lifting devices, so that the top surface of the rotating seat contacts the sprayed concrete layer sprayed on the inner side of the tunnel top; the rotating seat rotates relative to the sliding seat according to the surface angle of the sprayed concrete layer;

[0024] Step 4: Continue to lift the beam using a plurality of lifting devices to apply supporting force.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] When in use, first spray a layer of shotcrete onto the inner side of the tunnel top. The shotcrete layer is quick-setting concrete and can play a temporary supporting role. Then, slide rails are laid. The number of slide rails is adapted to the lifting device, and the number of lifting devices is set according to the length of the beam. The lifting device is moved by the slide rails to move the beam to a specified position. Then, the beam is lifted simultaneously by several lifting devices so that the top surface of the rotating seat contacts the shotcrete layer sprayed on the inner side of the tunnel top. As the lifting device continues to lift the beam, the rotating seat rotates relative to the sliding seat according to the surface angle of the shotcrete layer, and then fits with the concrete surface. The beam is continued to be lifted by several lifting devices to apply a supporting force. The setting of the rotating seat and the sliding seat can make the supporting surface match the inclination angle of the tunnel top, thereby increasing the effective supporting area of ​​the tunnel top. Then, the force is transmitted to the beam, and then from the beam to the lifting device and then to the ground, thereby achieving stable support, improving safety and reducing interface deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a cross-sectional view of the structure of the variable angle support device of the present invention;

[0030] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle part;

[0031] Figure 4 It is a cross-sectional view of the slide rail of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0033] Figure 6 For the present invention Figure 5 A partial enlarged view of point B in the middle;

[0034] Among them, 1. crossbeam; 2. baffle; 3. rotating seat; 4. hydraulic lifting rod; 5. first set of plates; 6. slide rail; 7. second set of plates; 8. first spring; 9. first slide groove; 10. friction plate; 11. first arc-shaped friction strip; 12. second arc-shaped friction strip; 13. arc-shaped groove; 14. horizontal slider; 15. second spring; 16. ball joint connecting rod; 17. rubber block; 18. sliding seat; 19. water injection pipe; 20. sprinkler cap; 21. water permeable hole; 22. vertical rod; 23. mounting frame; 24. limit plate; 25. third spring; 26. sprayed concrete layer; 27. tunnel top. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Embodiment 1:

[0038] Reference Figures 1 to 4 The present invention discloses a tunnel support device for a coal mine goaf, comprising: a crossbeam 1, a plurality of lifting devices are transmission-connected at the bottom of the crossbeam 1, the bottom end of the lifting devices is slidably arranged in a slide rail 6, and a plurality of variable angle support devices are symmetrically fixedly connected at the top of the crossbeam 1;

[0039] The variable angle support device comprises a rotating seat 3 and a sliding seat 18 . The rotating seat 3 is slidably connected to the sliding seat 18 via an arc groove 13 . The sliding seat 18 is fixed to the crossbeam 1 . Elastic support parts are respectively arranged at both ends of the rotating seat 3 .

[0040] When in use, first spray a shotcrete layer 26 onto the inner side of the tunnel top 27. The shotcrete layer 26 is quick-setting concrete and can play a temporary supporting role. Then, slide rails 6 are laid. The number of slide rails 6 is adapted to the lifting device, and the number of lifting devices is set according to the length of the beam 1. The lifting device is moved by the slide rails 6 to move the beam 1 to a specified position. Then, the beam 1 is lifted simultaneously by a plurality of lifting devices so that the top surface of the rotating seat 3 contacts the shotcrete layer 26 sprayed on the inner side of the tunnel top 27. As the lifting device continues to lift the beam 1, the rotating seat 3 rotates relative to the sliding seat 18 according to the surface angle of the shotcrete layer 26, and then fits with the concrete surface. The beam 1 is continuously lifted by a plurality of lifting devices to apply a supporting force. The setting of the rotating seat 3 and the sliding seat 18 can make the supporting surface match the inclination angle of the tunnel top 27, so that the effective supporting area of ​​the tunnel top 27 is increased. Then, the force is transmitted to the beam 1, and then transmitted from the beam 1 to the lifting device and then to the ground, so as to achieve stable support, improve safety and reduce interface deformation.

[0041] Further optimized solution, the elastic support part includes a ball joint connecting rod 16 spherically hinged with one end of the rotating seat 3, and there is at least one ball joint connecting rod 16, and a plurality of ball joint connecting rods 16 are vertically slidably connected to the same horizontal slider 14, and the two ends of the horizontal slider 14 are respectively slidably connected to the baffle 2, and the baffle 2 is respectively fixed to the front and rear sides of the beam 1;

[0042] The bottom end of the ball joint connecting rod 16 is axially connected with a flexible support portion;

[0043] A second elastic portion is disposed on the outer sleeve of the ball joint connecting rod 16 , and the second elastic portion is located between the rotating seat 3 and the horizontal sliding block 14 .

[0044] According to a further optimization scheme, the second elastic part includes a second spring 15 , which is coaxially sleeved on the outer side of the corresponding ball joint connecting rod 16 , the top end of the second spring 15 is fixedly connected to the rotating seat 3 , and the bottom end of the second spring 15 is fixedly connected to the horizontal slider 14 .

[0045] According to a further optimized solution, the flexible support portion includes a rubber block 17 , the top of the rubber block 17 is axially connected to the bottom end of the ball joint connecting rod 16 , and the bottom of the rubber block 17 is in contact with the surface of the sliding seat 18 .

[0046] Before the rotating seat 3 contacts the bottom surface of the tunnel top 27, the rotating seat 3 remains horizontal, and its own gravity compresses and deforms the rubber block 17 through the ball joint connecting rod 16. The deformation increases the contact area between the rubber block 17 and the sliding seat 18 surface, and the friction force increases, which can play a supporting role.

[0047] At this time, the rubber block 17 is in contact with the top surface of the sliding seat 18, the ball joint connecting rod 16 is in a vertical state, and the second spring 15 is at its initial length, so that the rotating seat 3 remains horizontal.

[0048] When the rotating seat 3 rotates relative to the sliding seat 18 due to the bottom angle of the tunnel top 27, it will drive the ball joint connecting rod 16 to rise and fall relative to the horizontal slider 14. When the ball joint connecting rod 16 rises and falls, the corresponding second spring 15 will be compressed or extended accordingly, and the downward moving end of the rotating seat 3 will continue to squeeze the corresponding rubber block 17 through the ball joint connecting rod 16, providing support force for the descending end of the rotating seat 3 after rotation by increasing friction. The upward moving end of the rotating seat 3 will cause the corresponding ball joint connecting rod 16 to move upward, and the corresponding rubber block 17 will return to its initial shape.

[0049] When the rotating seat 3 is separated from the tunnel top 27, the second spring 15 recovers its initial length, so that the rotating seat 3 returns to the horizontal position.

[0050] A further optimized solution is that a first arc-shaped friction strip 11 matching its curvature is embedded on the arc surface at the bottom of the rotating seat 3, the first arc-shaped friction strip 11 is frictionally matched with a second arc-shaped friction strip 12, the second arc-shaped friction strip 12 is embedded in an arc-shaped groove 13, and the second arc-shaped friction strip 12 matches the curvature of the arc-shaped groove 13.

[0051] In another embodiment, the first arc-shaped friction strip 11 matching the curvature of the rotating seat 3 can be embedded on the arc surface at the bottom of the rotating seat 3. In the initial state, the second spring 15 is replaced and the supporting force provided by the second spring 15 is used to separate the rotating seat 3 from the sliding seat 18. At this time, the second arc-shaped friction strip 12 matching the first arc-shaped friction strip 11 arranged in the arc-shaped groove 13 is separated from the first arc-shaped friction strip 11. When the lifting device lifts the beam 1, the rotating seat 3 first changes adaptively according to the angle, so that the rubber block 17 is deformed before the second spring 15. As the lifting continues, the second spring 15 is compressed or stretched. At this time, the first arc-shaped friction strip 11 contacts the second arc-shaped friction strip 12 and generates static friction, thereby fixing the rotating seat 3 and the sliding seat 18 relatively.

[0052] According to a further optimized solution, the lifting device includes a hydraulic lifting rod 4 , the top of the hydraulic lifting rod 4 is fixedly connected to the bottom of the beam 1 , and the bottom of the hydraulic lifting rod 4 is slidably connected to the slide rail 6 .

[0053] Further optimized solution, the middle outer coaxial sleeve of the fixed end of the hydraulic lifting rod 4 is provided with a first set of plates 5, the first set of plates 5 is fixedly connected to the fixed end of the hydraulic lifting rod 4, the bottom end of the hydraulic lifting rod 4 is vertically slidably matched with a second set of plates 7, the two ends of the second set of plates 7 are respectively slidably arranged on the slide rail 6 through the first slide grooves 9, and the two first slide grooves 9 are opened on the inner walls on both sides of the slide rail 6;

[0054] A first elastic portion is provided between the first set of plates 5 and the second set of plates 7; the first elastic portion is sleeved on the outside of the hydraulic lifting rod 4;

[0055] A friction part is fixedly connected to the bottom end of the hydraulic lifting rod 4 , and a friction plate 10 is frictionally matched with the friction part. The friction plate 10 is arranged along the length direction of the slide rail 6 , and the friction plate 10 is fixedly connected to the inner wall of the bottom of the slide rail 6 .

[0056] According to a further optimization scheme, the first elastic part includes a first spring 8 , which is coaxially sleeved on the outside of the hydraulic lifting rod 4 , the top end of the first spring 8 is fixedly connected to the bottom of the first set of plates 5 , and the bottom end of the first spring 8 is fixedly connected to the top of the second set of plates 7 .

[0057] According to a further optimized solution, the friction portion includes a friction pattern formed at the bottom of the fixed end of the hydraulic lifting rod 4 , and the friction pattern is frictionally matched with the friction plate 10 .

[0058] When in use, the first spring 8 is compressed later than the second spring 15. As the hydraulic lifting rod 4 continues to lift the crossbeam 1, the rotating seat 3 and the sliding seat 18 are relatively fixed. At this time, the bottom end of the hydraulic lifting rod 4 slides downward relative to the second set of plates 7, the first spring 8 is compressed, and the friction pattern at the bottom end of the second set of plates 7 and the friction plate 10 are matched, so that the hydraulic lifting rod 4 is relatively fixed on the slide rail 6, which is convenient for better transmission of force to the ground. When the load is unloaded, the first spring 8 lifts the corresponding hydraulic lifting rod 4 so that it can slide along the slide rail 6.

[0059] A construction method of a coal mine goaf tunnel support device, based on the above-mentioned coal mine goaf tunnel support device, comprises the following steps:

[0060] Step 1: spraying a shotcrete layer 26 on the inner side of the tunnel top 27;

[0061] Step 2: Move the lifting device via the slide rail 6 to move the beam 1 to a specified position;

[0062] Step 3: lift the crossbeam 1 simultaneously by means of a plurality of lifting devices, so that the top surface of the rotating seat 3 contacts the sprayed concrete layer 26 sprayed on the inner side of the tunnel top 27; the rotating seat 3 rotates relative to the sliding seat 18 according to the surface angle of the sprayed concrete layer 26;

[0063] Step 4: Continue to lift the beam 1 through several lifting devices to apply supporting force.

[0064] Embodiment 2:

[0065] refer to Figures 5 and 6The difference between this embodiment and the embodiment 1 is that a water injection pipe 19 is provided between the two sliding seats 18, and the water injection pipe 19 is arranged to penetrate the cross beam 1, and a mounting frame 23 is coaxially fixedly connected to the top of the water injection pipe 19. A plurality of vertical rods 22 arranged at equal intervals in the circumferential direction are vertically slid on the mounting frame 23, and the top ends of the plurality of vertical rods 22 are fixedly connected to the bottom end of the same sprinkler umbrella cap 20, and the sprinkler umbrella cap 20 is connected to the water injection pipe 19. A plurality of water permeable holes 21 arranged in a matrix are opened on the sprinkler umbrella cap 20, and the plurality of water permeable holes 21 are arranged around the sprinkler umbrella cap 20, and the bottom end of the vertical rod 22 is fixedly connected to a limit plate 24, and a third spring 25 is provided between the limit plate 24 and the mounting frame 23, and the third spring 25 is sleeved on the outer side of the corresponding vertical rod 22, and the top end of the third spring 25 is fixedly connected to the bottom of the mounting frame 23, and the bottom end of the third spring 25 is fixedly connected to the top of the corresponding limit plate 24.

[0066] In traditional support, the support surface and concrete are difficult to maintain due to obstruction. Geotextile is pre-laid between the support surface and the concrete, and connected to the water pipe through the water injection pipe 19. Water is injected into the water pipe by pressurization, so that water is sprayed on the geotextile through the various water-permeable holes 21 on the sprinkler cap 20. The geotextile is moistened as a whole due to capillary action, and the concrete in the obstructed part is cured by adding water. In order to prevent the sprinkler cap 20 from being crushed, it is designed to slide vertically relative to the water injection pipe 19. The top of the sprinkler cap 20 can be squeezed against the surface of the geotextile through the third spring 25.

[0067] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 a limitation on the present invention.

[0068] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A tunnel support device for coal mine goaf, characterized in that: include: A crossbeam (1), wherein the bottom of the crossbeam (1) is transmission-connected to a plurality of lifting devices, the bottom end of the lifting device is slidably arranged in a slide rail (6), and the top of the crossbeam (1) is symmetrically fixed to a plurality of variable-angle support devices; The variable angle support device comprises a rotating seat (3) and a sliding seat (18); the rotating seat (3) is slidably connected to the sliding seat (18) via an arc-shaped groove (13); the sliding seat (18) is fixed to the crossbeam (1); and elastic support parts are respectively provided at both ends of the rotating seat (3).

2. A coal mine goaf tunnel support device according to claim 1, characterized in that: The elastic support portion comprises a ball joint connecting rod (16) spherically hinged to one end of the rotating seat (3), the ball joint connecting rod (16) being at least one, a plurality of the ball joint connecting rods (16) being vertically slidably connected to the same horizontal sliding block (14), the two ends of the horizontal sliding block (14) being slidably connected to baffles (2), the baffles (2) being respectively fixed to the front and rear sides of the cross beam (1); The bottom end of the ball joint connecting rod (16) is axially connected to a flexible support portion; The outer sleeve of the ball joint connecting rod (16) is provided with a second elastic portion, and the second elastic portion is located between the rotating seat (3) and the horizontal sliding block (14).

3. A coal mine goaf tunnel support device according to claim 2, characterized in that: The second elastic part comprises a second spring (15), the second spring (15) is coaxially sleeved on the outer side of the corresponding ball joint connecting rod (16), the top end of the second spring (15) is fixedly connected to the rotating seat (3), and the bottom end of the second spring (15) is fixedly connected to the horizontal sliding block (14).

4. A coal mine goaf tunnel support device according to claim 2, characterized in that: The flexible support portion comprises a rubber block (17), the top of the rubber block (17) is axially connected to the bottom end of the ball joint connecting rod (16), and the bottom of the rubber block (17) is in contact with the surface of the sliding seat (18).

5. A coal mine goaf tunnel support device according to claim 1, characterized in that: A first arc-shaped friction strip (11) matching the arc of the rotating seat (3) is embedded on the arc surface at the bottom thereof; the first arc-shaped friction strip (11) is frictionally matched with a second arc-shaped friction strip (12); the second arc-shaped friction strip (12) is embedded in the arc-shaped groove (13); the second arc-shaped friction strip (12) matches the arc of the arc-shaped groove (13).

6. A coal mine goaf tunnel support device according to claim 1, characterized in that: The lifting device comprises a hydraulic lifting rod (4), the top of the hydraulic lifting rod (4) is fixedly connected to the bottom of the crossbeam (1), and the bottom of the hydraulic lifting rod (4) is slidably connected to the slide rail (6).

7. A coal mine goaf tunnel support device according to claim 6, characterized in that: A first set plate (5) is coaxially sleeved on the middle outer part of the fixed end of the hydraulic lifting rod (4), the first set plate (5) is fixedly connected to the fixed end of the hydraulic lifting rod (4), and a second set plate (7) is vertically slidably matched at the bottom end of the hydraulic lifting rod (4), and the two ends of the second set plate (7) are respectively slidably arranged on the slide rail (6) through first slide grooves (9), and two first slide grooves (9) are opened on the inner walls on both sides of the slide rail (6); A first elastic portion is provided between the first set plate (5) and the second set plate (7); the first elastic portion is sleeved on the outside of the hydraulic lifting rod (4); The bottom end of the hydraulic lifting rod (4) is fixedly connected with a friction part, and the friction part is frictionally matched with a friction plate (10). The friction plate (10) is arranged along the length direction of the slide rail (6), and the friction plate (10) is fixedly connected to the inner wall of the bottom of the slide rail (6).

8. A coal mine goaf tunnel support device according to claim 7, characterized in that: The first elastic part comprises a first spring (8), which is coaxially sleeved on the outside of the hydraulic lifting rod (4), the top end of the first spring (8) is fixedly connected to the bottom of the first sleeve plate (5), and the bottom end of the first spring (8) is fixedly connected to the top of the second sleeve plate (7).

9. A coal mine goaf tunnel support device according to claim 7, characterized in that: The friction portion comprises a friction pattern formed at the bottom of the fixed end of the hydraulic lifting rod (4), and the friction pattern is frictionally matched with the friction plate (10).

10. A construction method for a coal mine goaf tunnel support device, based on a coal mine goaf tunnel support device according to any one of claims 1 to 9, characterized in that: The steps include: Step 1, spraying a shotcrete layer (26) on the inner side of the tunnel top (27); Step 2: Move the lifting device via the slide rail (6) to move the crossbeam (1) to a designated position; Step 3: The crossbeam (1) is lifted up simultaneously by a plurality of lifting devices, so that the top surface of the rotating seat (3) contacts the sprayed concrete layer (26) sprayed on the inner side of the tunnel top (27); the rotating seat (3) rotates relative to the sliding seat (18) according to the surface angle of the sprayed concrete layer (26); Step 4: Continue to lift the crossbeam (1) by using a plurality of the lifting devices to apply a supporting force.

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