A coal mine goaf tunnel support system and method

Abstract

The present application relates to a tunnel support system and method for a coal mine goaf, belonging to the technical field of tunnel support. The support system includes support columns located on both sides of the tunnel and a roof plate arranged above the support columns. One ends of the roof plate far from the support columns are hinged to each other. A cross beam is abutted against the upper end of the support column, and the cross beam is horizontally arranged below the roof plate. A top column connected to the bottom wall of the cross beam slides vertically along the support column, and the top column is used to push the cross beam to drive the roof plate to rotate. A driving assembly for driving the sliding of the top column is arranged on the support column. The method includes: building a support plate, building a roof plate, fitting the roof plate, fitting the support plate, and building and tunneling. By sliding the top column and the cross beam, the present application uses the top column to drive the cross beam to slide upward to push the roof plate to open, so that the roof plate can better fit the top wall of the tunnel, reduce the gap between the roof plate and the top wall of the tunnel, and thus has the advantage of improving the support and fitting property of the inner wall of the tunnel.

Description

Technical Field

[0001] This application relates to the technical field of tunnel support, and in particular to a tunnel support system and method for coal mine goafs. Background Technique

[0002] Currently, the development of coal mine resources mainly focuses on underground. Before coal mining, tunnels need to be dug, and the excavated tunnels are also called roadways. Then, they are used for personnel to enter and exit, and to transport the mined coal mine resources away. Therefore, when transporting coal mine resources out of the tunnel, the stability of the tunnel is crucial.

[0003] Related technologies such as a coal mine roadway support device disclosed in CN112576289A include a bottom plate. On the upper end of the bottom plate, a first roadway support plate and a second roadway support plate are symmetrically installed. A groove is provided on one side of the first roadway support plate, and a controller is arranged inside the groove. Support sleeves are fixedly installed at the upper ends of the first roadway support plate and the second roadway support plate. By rotating the crank, the first driving bevel gear and the first driven bevel gear rotate, driving the one-way lead screw to rotate. By rotating the one-way lead screw, the lifting tube rises. The first sliding groove and the first sliding block cooperate to limit the lifting of the lifting tube. By lifting the lifting tube, the roadway roof support plate is raised. By rotating the T-shaped rod, the second driving bevel gear and the second driven bevel gear rotate. By rotating the second driven bevel gear, the bidirectional lead screw rotates, and the telescopic tube sleeved with the second internal thread is telescoped to support both sides of the inner wall of the roadway roof support plate.

[0004] Regarding the above related technologies, the inventor found that when supporting a coal mine tunnel, the T-shaped rod rotates to telescope the telescopic tube sleeved with the second internal thread, only supporting the inner wall of the support plate. When the inner wall of the tunnel is uneven and the outer wall of the support plate does not fit the inner wall of the tunnel, there is a gap between the support plate and the inner wall of the tunnel, so the fitting degree of supporting the inner wall of the tunnel needs to be improved. Summary of the Invention

[0005] In order to improve the fitting degree of supporting the inner wall of the tunnel, the purpose of this application is to provide a tunnel support system and method for coal mine goafs.

[0006] On the one hand, a tunnel support system for coal mine goafs provided by this application adopts the following technical solution:

[0007] A tunnel support system for coal mine goafs includes support columns on both sides of the tunnel and a roof arranged above the support columns. One ends of the roof far from the support columns are hinged to each other. A cross beam abuts against the upper ends of the support columns, and the cross beam is horizontally placed below the roof. A top column connected to the bottom wall of the cross beam slides vertically inside the support column. The top column is used to push the cross beam to drive the roof to rotate. A driving assembly for driving the top column to slide is provided on the support column.

[0008] By adopting the above technical solution, when the tunnel in the goaf of the coal mine is supported, the support columns are erected on both sides inside the tunnel so that the support columns abut against both sides of the inner wall of the tunnel. Then the top columns and the cross beams are erected, and the roof plate is placed on the cross beams to form the support for the top wall of the tunnel. The driving assembly is started to drive the top column to slide upward. After the top column slides upward, it drives the cross beam to move upward to push the roof plate to open, so that the roof plate can fit more closely to the top wall of the tunnel, reducing the gap between the roof plate and the top wall of the tunnel, thereby improving the fitting degree of the support for the inner wall of the tunnel.

[0009] Optionally, the driving assembly includes a lead screw rotatably connected inside the support column, a bevel gear set connected to the lower end of the lead screw, and a driving rod detachably connected to the bevel gear set. The driving rod is used to drive the bevel gear set to rotate and drive the lead screw to rotate. The lead screw is threadedly connected inside the top column.

[0010] By adopting the above technical solution, when driving the top column to slide upward, the driving rod is inserted into the bevel gear set so that one of the bevel gears of the driving rod and the bevel gear set is coaxially connected. Then the driving rod is rotated. The driving rod drives the bevel gear set to rotate, and then drives the lead screw to rotate. After the lead screw rotates, it drives the top column to slide vertically inside the support column, so as to facilitate pushing the cross beam upward. After the cross beam pushes the roof plate to open, it fits more closely to the inner wall of the tunnel.

[0011] Optionally, support plates are provided on the opposite sides of the support column. The support plates are used to support the side walls on both sides of the tunnel. The upper ends of the support plates are hinged to the lower ends of the roof plate.

[0012] By adopting the above technical solution, when supporting the top wall of the tunnel, after the roof plate is pushed by the cross beam and opens to fit the tunnel, the roof plate rotates to drive the support plates to rotate, so that the support plates fit more closely to the side walls on both sides inside the tunnel. When the roof plate supports the top wall of the tunnel, the support plates support both sides inside the tunnel, thereby realizing the simultaneous support for the top wall and both sides of the tunnel.

[0013] Optionally, a resisting rod is hinged inside the support column. One end of the resisting rod away from the support plate is hinged inside the support column, and the end of the resisting rod close to the support plate abuts against the support plate. A resisting groove for the resisting rod to pass through is opened at the lower end of the top column. The top column is used to drive the resisting rod to rotate upward and push the support plate away from the support column.

[0014] By adopting the above technical solution, when the top column slides upward, on the one hand, it drives the cross beam to push the roof plate to open to support the top wall of the tunnel. On the other hand, after the top column slides upward, it drives the resisting rod to rotate upward, so that the resisting rod pushes the support plate away from the support column. After the support plate is driven by the roof plate to move away from the support column, it is also pushed by the resisting rod. The support plate receives the force from the horizontal direction of the resisting rod, thereby strengthening the stability of the support plate for supporting the side walls on both sides of the inner wall of the tunnel.

[0015] Optionally, the support rod includes a hinged rod hinged in a supporting column, a sleeve rod slidably mounted on the hinged rod, the sleeve rod is located in an abutment groove, and the lower end of the top column is provided with an abutment block for pushing the sleeve rod to slide from the hinged rod, the abutment block abuts against the side wall of the sleeve rod facing away from the support plate, and the sleeve rod abuts against the support plate at an inclined downward angle.

[0016] By adopting the above technical solution, when the top column slides up, the sleeve rod is abutted by the abutment block, so that when the sleeve rod and the hinge rod rotate upward, the sleeve rod slides away from the hinge rod due to the abutment of the abutment block. The sleeve rod that slides out pushes the support plate in the direction away from the support column, and the support plate can continue to push as the top column slides up, without considering the direction of the sleeve rod and the hinge rod at this time, so that the support plate can always be abutted during the sliding process of the top column, so that the support plate and the top plate can simultaneously press against the inner wall of the tunnel to form support.

[0017] Optionally, the driving rod includes rod one and rod two coaxially and detachably connected to the two bevel gear sets, and a sleeve sleeved on one end of rod one and rod two close to each other, wherein a spring is arranged in the sleeve to push rod one and rod two away from each other.

[0018] By adopting the above technical solution, when the screw is driven to rotate, the rod 1 and the rod 2 are slid into the sleeve to compress the spring and shorten the length of the rod 1 and the rod 2. It is convenient to align the rod 1 and the rod 2 with one of the bevel gears in the bevel gear set, and then loosen the rod 1 and the rod 2, so that the rod 1 and the rod 2 slide into one of the bevel gears in the bevel gear set under the action of the spring. So that the sleeve can be rotated to drive the rod 1 and the rod 2 to rotate synchronously, and then drive the bevel gear set to rotate and the screw to rotate, so as to facilitate the synchronous sliding of the top columns on both sides of the tunnel.

[0019] Optionally, two ends of the sleeve are hinged with shifting rods corresponding to the first rod and the second rod respectively.

[0020] By adopting the above technical solution, when the rotating sleeve drives rod one and rod two to rotate synchronously, the lever corresponding to rod one and rod two on the sleeve is moved to increase the force point when the sleeve rotates, so that the construction personnel can turn the lever to drive the sleeve to rotate.

[0021] Optionally, one end of the lever hinged in the sleeve is connected to a positioning block, and the side walls of the rod one and the rod two are provided with positioning grooves for the positioning block to rotate into, and the rod one and the rod two are both rotated in the sleeve.

[0022] By adopting the above technical solution, when only one side of the top column in the tunnel needs to be driven to slide, the lever corresponding to the first or second rod on the sleeve is rotated from the sleeve, so that the lever is rotated to be perpendicular to the length direction of the sleeve. Then the positioning block is driven to rotate into the positioning groove of the first or second rod, that is, the first or second rod with the positioning block in the positioning groove is fixed to the sleeve, and at this time, the sleeve rotation can drive the first or second rod with the positioning block to rotate, and the other first or second rod without the positioning block will not rotate with the rotation of the sleeve, so that it is convenient to adjust the sliding of the top column on one side of the tunnel separately.

[0023] On the other hand, the present application also provides a method for supporting a tunnel in a coal mine goaf area, which adopts a coal mine goaf area tunnel support system, comprising the following steps:

[0024] The support columns drive the support plates to fit the side walls of the tunnel, supporting the top columns and beams;

[0025] The top plate is placed on the cross beam, so that the top plate and the cross beam are plug-in but slidable;

[0026] Insert the driving rod into the supporting column and rotate it, so that the top column drives the cross beam to slide against the top plate and move it up to fit the top wall of the tunnel;

[0027] The top column moves upward to drive the push rod to rotate, and the push rod pushes the support plate to press against the side walls on both sides of the tunnel;

[0028] Excavate under the support of the top plate, and set up the next set of top plates after each excavation of the length of the driving rod.

[0029] By adopting the above technical solution, when supporting the tunnel in the coal mine goaf area, the support column drives the support plate to fit the side walls of the tunnel on both sides, so that the support column and the support plate are placed vertically, and the top column and the crossbeam are supported. After supporting the crossbeam and the support plate, the top plate is placed on the crossbeam to form a plug-in connection between the top plate and the crossbeam but can slide, so that the top plate can rotate upward. Then, after the rods 1 and 2 are retracted, they are aligned with the bevel gear set, so that the rods 1 and 2 slide into one of the bevel gears of the bevel gear set under the action of the spring. Then, the lever is moved to drive the sleeve to rotate, and then the rods 1 and 2 are driven to rotate synchronously. After the rods 1 and 2 rotate, the screw is driven to rotate through the bevel gear set, and the screw drives the top column to slide upward in the support column to drive the crossbeam to push the top plate open, so that the top plate is close to the top wall of the tunnel after opening. As the top column slides upward, it drives the push rod to rotate upward, and the push rod pushes the support plate away from the support column. At the same time, the support plate is also driven by the top plate to press the side walls on both sides of the tunnel tightly, so as to support the tunnel side walls above and on both sides of the top plate. Finally, excavation is carried out under the support of the top plate. After excavation to the length of the driving rod, the next set of support columns and top plates are set up, and the tunnel is supported in the coal mine goaf area.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. By sliding the top column and the cross beam, the top column drives the cross beam to slide upward and abut against the top plate to open it, so that the top plate can fit more closely to the tunnel top wall, reducing the gap between the top plate and the tunnel top wall, thereby improving the fitting of the support to the tunnel inner wall;

[0032] 2. By setting the support plate and the abutting rod, the support plate is subjected to the force from the horizontal direction of the abutting rod, thereby strengthening the stability of the support plate in supporting both sides of the tunnel inner wall;

[0033] 3. By setting the hinge rod, the sleeve rod, and the abutting block, regardless of the orientation of the sleeve rod and the hinge rod at this time, the support plate can always be abutted during the upward sliding of the top column, so that the support plate and the top plate can simultaneously abut against the tunnel inner wall to form a support;

[0034] 4. By setting the rod one, the rod two, the spring, and the lever, rotating the sleeve can drive the rod one and the rod two to rotate synchronously, and then drive the bevel gear set to rotate and the lead screw to rotate, so as to facilitate the synchronous sliding of the top columns on both sides in the tunnel;

[0035] 5. By setting the positioning block and the positioning groove, the separate rotation of the rod one and the rod two is realized, so as to facilitate the separate adjustment of the sliding of the top column on one side in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is the overall structural schematic diagram of the support system in the embodiment of the present application.

[0037] Figure 2 is the cross-sectional schematic diagram for showing the driving component in the embodiment of the present application.

[0038] Figure 3 is the cross-sectional schematic diagram for showing the abutting rod in the embodiment of the present application.

[0039] Figure 4 is the flow block diagram of the support method in the embodiment of the present application.

[0040] Description of the reference numerals: 1, support column; 11, top column; 111, abutting groove; 112, abutting block; 12, cross beam; 13, abutting rod; 131, hinge rod; 132, sleeve rod; 2, support plate; 3, top plate; 4, driving component; 41, lead screw; 42, bevel gear set; 421, bevel gear one; 422, bevel gear two; 43, driving rod; 431, rod one; 432, rod two; 433, sleeve; 434, lever; 435, positioning block; 436, positioning groove; 437, spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The following is combined with the attached Figures 1-4A further detailed description of the present application is provided.

[0042] An embodiment of the present application discloses a tunnel support system for a coal mine gob area.

[0043] Referring to Figure 1 , the tunnel support system for the coal mine gob area includes support columns 1 located on both sides inside the tunnel, support plates 2 located on the opposite sides of the two support columns 1, and roof plates 3 hinged to the upper ends of the support plates 2 and abutting against the top wall of the tunnel. There are two roof plates 3, which correspond to the support plates 2 one by one, that is, the mutually approaching ends of the roof plates 3 are hinged, and the support plates 2 abut against the side walls on both sides inside the tunnel.

[0044] Referring to Figure 1 and Figure 2 , the hinge axis of the roof plate 3 is parallel to the hinge axis of the support plate 2. A top column 11 slides vertically inside the support column 1, and the top column 11 can slide out of the upper end of the support column 1. A cross beam 12 is connected to the upper end of the top column 11 when the top column 11 slides out of the support column 1. The cross beam 12 is horizontally placed below the roof plate 3, and an embedding groove for the roof plate 3 to be embedded is provided on the cross beam 12, and the cross beam 12 slidably abuts against the bottom wall of the roof plate 3.

[0045] Referring to Figure 1 and Figure 2 , a driving assembly 4 for driving the top column 11 to slide upward is installed inside the support column 1. After the top column 11 slides upward, it drives the cross beam 12 to slide upward. The cross beam 12 pushes the roof plate 3 to open, reducing the gap between the roof plate 3 and the top wall of the tunnel. At the same time, the roof plate 3 also drives the support plate 2 to slide obliquely upward and away from the support column 1, pressing the two sides of the inner wall of the tunnel tightly.

[0046] Referring to Figure 2 , the driving assembly 4 includes a lead screw 41 rotatably connected inside the support column 1, a bevel gear set 42 connected to the lower end of the lead screw 41, and a driving rod 43 detachably connected to the bevel gear set 42. The lead screw 41 penetrates and is threadedly connected to the inside of the top column 11. The bevel gear set 42 includes a first bevel gear 421 coaxially connected to the lower end of the lead screw 41 and a second bevel gear 422 located on one side of the lead screw 41 and meshing with the first bevel gear 421.

[0047] Referring to Figure 2The bevel gear 2 422 and the driving rod 43 are detachably connected. The driving rod 43 includes a rod 1 431 and a rod 2 432 detachably connected to the bevel gear 2 422, and a sleeve 433 sleeved on one end of the rod 1 431 and the rod 2 432 close to each other. The rod 1 431 and the rod 2 432 are parallel to each other and correspond to the support columns 1 on both sides of the tunnel. An axial hole is provided on the bevel gear 2 422, and the axial hole passes through the side wall of the support column 1. The axial hole is for the rod 1 431 and the rod 2 432 to be inserted, so that the rod 1 431, the rod 2 432 and the bevel gear 2 422 are coaxially connected, so that the sleeve 433 is rotated to drive the rod 1 431 and the rod 2 432 to rotate, and then drive the bevel gear 2 422 and the bevel gear 1 421 to rotate, thereby driving the screw 41 to rotate, and realizing the synchronous upward sliding of the top column 11 in the support column 1.

[0048] Reference Figure 2 The two ends of the sleeve 433 are hinged with levers 434 corresponding to the rod 1 431 and the rod 2 432, respectively, and the hinge axis of the lever 434 is perpendicular to the length direction of the sleeve 433. After the lever 434 is turned away from the sleeve 433, the lever 434 is moved to drive the sleeve 433 to rotate, which is more labor-saving.

[0049] Reference Figure 2 , the rod 1 431 and the rod 2 432 rotate in the sleeve 433, and the end of the lever 434 located in the sleeve 433 is connected with a positioning block 435, and the side walls of the rod 1 431 and the rod 2 432 are provided with a positioning groove 436 for the positioning block 435 to rotate into. By rotating the lever 434, the positioning block 435 is driven to rotate into the positioning groove 436, and the rotation of the rod 1 431 or the rod 2 432 on one side of the sleeve 433 is locked, so that after the sleeve 433 rotates, the rod 1 431 or the rod 2 432 is driven to rotate alone, thereby realizing the driving of the top column 11 in the support column 1 on one side of the tunnel.

[0050] Reference Figure 3 A support rod 13 is hinged in the support column 1, and the hinge axis of the support rod 13 extends in the horizontal direction. The end of the support rod 13 passes through the support column 1 and abuts against the support plate 2. The support rod 13 includes a hinge rod 131 hinged in the support column 1, and a sleeve rod 132 slidably sleeved on the hinge rod 131. The sleeve rod 132 slides along the length direction of the hinge rod 131, and the sleeve rod 132 abuts against the side wall of the support plate 2 in an inclined downward direction.

[0051] Reference Figure 3 The lower end of the top column 11 is provided with an abutment groove 111 for the sleeve rod 132 to be embedded in. The abutment groove 111 passes through the side walls on both sides of the support column 1 so that the sleeve rod 132 extends from the support column 1 and abuts against the supporting plate 2. The sleeve rod 132 can rotate in the abutment groove 111.

[0052] Reference Figure 3, a contact block 112 is connected to the bottom wall of the contact groove 111. The contact block 112 tapers upward in the vertical direction. The contact block 112 contacts the side wall of the sleeve rod 132 facing away from the support plate 2, so as to facilitate the upward sliding of the top column 11. While driving the sleeve rod 132 to rotate upward, by contacting the sleeve rod 132 with the contact block 112, the sleeve rod 132 is slid in a direction away from the hinge rod 131, so as to increase the length of the sleeve rod 132 on the hinge rod 131, and further facilitate pushing the support plate 2 to slide obliquely upward away from the support column 1 to tightly contact the inner wall of the tunnel.

[0053] The implementation principle of a coal mine goaf tunnel support system according to an embodiment of the present application is as follows: When supporting a coal mine goaf tunnel, the support column 1 and the support plate 2 contact the inner wall of the tunnel, and the first rod 431 and the second rod 432 are inserted into the bevel gear set 42. Rotating the lever 434 drives the sleeve 433 to rotate, driving the bevel gear set 42 and the lead screw 41 to rotate, so that the top column 11 slides upward to drive the cross beam 12 to lift the roof 3. After the roof 3 is opened, the gap between the roof 3 and the top wall of the tunnel is reduced, and at the same time, the support plate 2 is also driven to obliquely upward away from the support column 1. The upward sliding of the top column 11 drives the contact rod 13 to push the support plate 2 to tightly contact the side walls on both sides of the tunnel, so that the roof 3 and the support plate 2 tightly contact the inner wall of the tunnel for support, reducing the gap between the roof 3, the support plate 2 and the tunnel, thereby improving the fitting degree of the support for the inner wall of the tunnel.

[0054] An embodiment of the present application also discloses a coal mine goaf tunnel support method, which adopts the coal mine goaf tunnel support system, referring to Figure 4 , including the following steps,

[0055] Support plate 2 erection: The support column 1 is erected at the goaf tunnel entrance, the support plate 2 is tightly contacted with the inner walls on both sides of the tunnel, and the top column 11 and the cross beam 12 are erected, so that the cross beam 12 is horizontally placed at the upper end of the tunnel;

[0056] Roof 3 erection: The roof 3 is placed in the slot of the cross beam 12 and forms an arch shape, so that the roof 3 is inserted into the slot of the cross beam 12 to form a plug-in connection, but can slide, facilitating the cross beam 12 to be able to push the roof 3 to open and fit the top wall of the tunnel more closely;

[0057] Roof 3 fitting: Compress the spring 437 of the driving rod 43, that is, the first rod 431 and the second rod 432, and then align them with the shaft holes of the bevel gear set 42, and then release. Under the action of the spring 437, the first rod 431 and the second rod 432 are inserted into the shaft holes of the bevel gear set 42, and then rotate the lever 434 to drive the sleeve 433, the first rod 431, the second rod 432, and the lead screw 41 to rotate, so as to drive the top column 11 to slide upward, push the cross beam 12 upward, and the cross beam 12 pushes the roof 3 to open and fit the top wall of the tunnel more closely.

[0058] When the support plate 2 is in contact, during the upward sliding of the top column 11, it first drives the sleeve rod 132 and the hinge rod 131 to rotate, and then the abutting block 112 drives the sleeve rod 132 to slide to lift the support plate 2 away from the support column 1, so as to press the support plate 2 against the two side walls inside the tunnel. When releasing, it only needs to move the top column 11 downward to drive the sleeve rod 132 and the hinge rod 131 to reset.

[0059] Finally, tunneling is carried out under the support of the roof plate 3 and the support plate 2. After each drive rod 43, that is, the lengths of rod one 431 and rod two 432, the next set of roof plate 3 and support plate 2 is erected, and the tunnel in the coal mine goaf is built and supported in this way of tunneling.

[0060] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A tunnel support system for coal mine gob areas, characterized in that: It includes support columns (1) located on both sides of the tunnel and a roof plate (3) arranged above the support columns (1). One ends of the roof plate (3) far from the support columns (1) are hinged to each other. The upper end of the support column (1) abuts against a cross beam (12), and the cross beam (12) is horizontally placed below the roof plate (3). A top column (11) connected to the bottom wall of the cross beam (12) slides vertically in the support column (1), and the top column (11) is used to push the cross beam (12) to drive the roof plate (3) to rotate. A driving assembly (4) for driving the top column (11) to slide is provided on the support column (1); The driving assembly (4) includes a lead screw (41) rotatably connected inside the support column (1), a bevel gear set (42) connected to the lower end of the lead screw (41), and a driving rod (43) detachably connected to the bevel gear set (42). The driving rod (43) is used to drive the bevel gear set (42) to rotate so as to drive the lead screw (41) to rotate, and the lead screw (41) is threadedly connected inside the top column (11); Support plates (2) are provided on the opposite sides of the support column (1), and the support plates (2) are used to support the side walls on both sides of the tunnel. The upper ends of the support plates (2) are hinged to the lower ends of the roof plate (3); An abutting rod (13) is hinged inside the support column (1). One end of the abutting rod (13) far from the support plate (2) is hinged inside the support column (1), and the end of the abutting rod (13) close to the support plate (2) abuts against the support plate (2). An abutting groove (111) for the abutting rod (13) to pass through is opened at the lower end of the top column (11), and the top column (11) is used to drive the abutting rod (13) to rotate upward and push the support plate (2) away from the support column (1); The abutting rod (13) includes a hinged rod (131) hinged inside the support column (1) and a sleeve rod (132) slidably sleeved on the hinged rod (131). The sleeve rod (132) is located in the abutting groove (111). Abutting blocks (112) for pushing the sleeve rod (132) to slide on the hinged rod (131) are provided at the lower end of the top column (11). The abutting blocks (112) abut against the side wall of the sleeve rod (132) facing away from the support plate (2), and the sleeve rod (132) abuts against the support plate (2) at an inclined downward angle.

2. The tunnel support system for coal mine gob areas according to claim 1, characterized in that: The driving rod (43) includes a rod one (431) and a rod two (432) detachably and coaxially connected to two bevel gear sets (42), and a sleeve (433) sleeved on the ends of the rod one (431) and the rod two (432) close to each other. A spring (437) for pushing the rod one (431) and the rod two (432) away from each other is provided inside the sleeve (433).

3. The tunnel support system for coal mine gob areas according to claim 2, characterized in that: Pushing rods (434) corresponding to the rod one (431) and the rod two (432) respectively are hinged at both ends of the sleeve (433).

4. The tunnel support system for coal mine gob areas according to claim 3, characterized in that: One end of the pushing rod (434) hinged inside the sleeve (433) is connected with a positioning block (435). Positioning grooves (436) for the positioning block (435) to turn into are opened on the side walls of the rod one (431) and the rod two (432), and both the rod one (431) and the rod two (432) rotate inside the sleeve (433).

5. A tunnel support method for coal mine gob areas, characterized in that: A coal mine gob tunnel support system described in any one of claims 1-4 is adopted, including the following steps: The support column (1) drives the support plate (2) to fit against the side walls on both sides of the tunnel, and props up the top column (11) and the cross beam (12); The roof plate (3) is placed on the cross beam (12), and the roof plate (3) and the cross beam (12) are inserted but can slide; The driving rod (43) is inserted into the support column (1) and rotated, and the top column (11) drives the cross beam (12) to slide and abut against the roof plate (3) to move up and fit against the top wall of the tunnel; The upward movement of the top column (11) drives the abutting rod (13) to rotate, and the abutting rod (13) abuts against the support plate (2) to tightly abut against the side walls on both sides of the tunnel; Tunneling is carried out under the support of the roof plate (3). After each driving rod (43) length is tunnelled, the next group of roof plates (3) is erected.

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