A bauxite mining method without leaving a roof guard

Abstract

The present invention belongs to the technical field of underground bauxite mining, specifically a bauxite mining method without leaving a roof guard; the method includes dividing the ore blocks, excavating transport tunnels and return air tunnels; dividing the ore blocks into several groups of mining columns, each group of mining columns including inter-mining columns and full-mining columns; the inter-mining columns are spaced to form ore pillars and mine rooms; mining each group of mining columns in turn, using row hydraulic supports for support; and recovering the row hydraulic supports. Compared with the existing method, the bauxite mining method of the present invention does not leave a roof guard, and the ore layer is mined all at once. The roof is supported by row hydraulic supports, which not only realizes the mining of the roof guard ore layer without causing waste of bauxite resources, but also achieves the purpose of ensuring the safety of personnel and equipment in the mining space, and will not affect normal production operations. The row hydraulic supports can be recycled after being withdrawn, maximizing the cost savings of the supports.

Description

Technical Field

[0001] The invention belongs to the technical field of underground bauxite mining, and in particular relates to a bauxite mining method without leaving a mine roof. Background Art

[0002] Currently, the development and utilization of underground bauxite resources is still in its infancy. Mining methods primarily rely on room-and-pillar methods, relying on drilling and blasting to achieve ore drop. The stope roof and surrounding rock are stabilized by leaving numerous point and intermediate pillars and a protective roof. The direct roof of bauxite ore is mostly composed of soft rock, such as claystone. Claystone is weak and fragmented, has low compressive and shear strength, and is unstable. It weathers rapidly when exposed to air, making it highly susceptible to roof collapse. Therefore, in bauxite mining engineering practice, a suitable thickness of bauxite ore is typically reserved as a protective roof to prevent weathering and collapse of the direct claystone roof. This protective roof prevents direct contact with the air, thereby preventing weathering and acting as a stable roof, protecting the stope space and ensuring the safety of personnel and equipment working within it. However, the extensive use of protective roofs results in wasted bauxite, low resource utilization, and an excessively high proportion of protective roofs significantly reduces bauxite recovery rates. Furthermore, existing mining methods require the installation of anchor bolts and mesh on top of the remaining retaining roof, increasing the workload and construction time, impacting mining efficiency, and requiring regular inspection and maintenance, which in turn increases costs. Therefore, addressing the resource waste caused by the extensive use of retaining roofs, improving bauxite recovery rates, and ensuring safety during mining are crucial. Summary of the Invention

[0003] The purpose of the present invention is to provide a mining method without leaving a roof guard during bauxite mining, so as to solve the problem that existing mines cannot mine bauxite resources with a roof guard while ensuring safety.

[0004] In order to solve the above problems, the present invention provides a bauxite mining method without leaving a ore roof, comprising the following steps:

[0005] Step 1: Divide a certain stage of the ore body into several blocks along the ore body strike, and leave pillars between adjacent blocks;

[0006] Step 2: Excavate a transport tunnel along the ore body at the bottom of the ore block; excavate a return air tunnel along the ore body at the top of the ore block;

[0007] Preferably, in the second step, the bottom of the transport tunnel is a bottom column, and the top of the return air tunnel is a top column.

[0008] Step 3: Arrange a cutting shaft along the ore body inclination beside the intermediate pillar on the right side of the ore block to connect the transport tunnel and the return air tunnel;

[0009] Step 4: Divide the ore block into several groups of mining columns along the strike of the ore body. Each group of mining columns includes an intermediate mining column on the left and a full mining column on the right. The intermediate mining columns are arranged at intervals along the inclination of the ore body as pillars and mine rooms. The pillars are not mined, the mine rooms are mined, and the full mining columns are fully mined.

[0010] Preferably, in the fourth step, the length of the mining column is the width of the ore block between the transport tunnel and the return air tunnel.

[0011] Step 5: Mining each group of mining columns from left to right in turn; the mining steps for each group of mining columns are:

[0012] a. Mining is carried out in full strips from the transport roadway to the return air roadway, and the mining thickness is the full thickness of the ore body;

[0013] b. Use row hydraulic supports to timely support the roof of the mining space;

[0014] c. transporting the mined ore;

[0015] d. Repeat step a; and promptly move the row of hydraulic supports forward in the direction of mining. When the length of the row of hydraulic supports cannot support the mining space, add a new row of hydraulic supports; repeat step c; until the mining column is fully mined;

[0016] Preferably, the width of the row of hydraulic supports is the same as the width of the full-mining columns.

[0017] Preferably, each row of hydraulic supports includes several rows of odd-row hydraulic supports and even-row hydraulic supports arranged at intervals from front to back, and each row of odd-row hydraulic supports and each row of even-row hydraulic supports include at least two hydraulic supports; the tops of the odd-row hydraulic supports are connected to the odd-row joists, and the tops of the even-row hydraulic supports are connected to the even-row joists; all the odd-row joists are fixed as a whole through several odd-row top beams, and each odd-row top beam is fixedly connected to the tops of all the odd-row joists; all the even-row joists are fixed as a whole through several even-row top beams, and each even-row top beam is fixedly connected to the tops of all the even-row joists; the odd-row top beams and even-row top beams are arranged at intervals along the left-right direction; the odd-row top beams are slidably connected to the tops of the even-row joists, and the even-row top beams are slidably connected to the tops of the odd-row joists; a hydraulic propulsion cylinder connection is provided between adjacent odd-row joists and even-row joists.

[0018] Preferably, a hydraulic propulsion cylinder connection is provided between an adjacent odd-row joist and an adjacent even-row joist.

[0019] Preferably, a flip beam is hinged on the left side of the odd-row support beam and the even-row support beam, and a retractable telescopic beam is provided inside the flip beam; the flip beam and / or the telescopic beam is supported by a single hydraulic support.

[0020] Preferably, in the fifth step, the advancing manner of the row of hydraulic supports in step b and step d is as follows:

[0021] ① Odd-row hydraulic props and even-row hydraulic props respectively support odd-row joists and even-row joists, thereby enabling odd-row top beams and even-row top beams to support the roof;

[0022] ② Lift all even-row hydraulic supports to remove even-row top beams from their original supporting state;

[0023] ③ The hydraulic propulsion cylinder extends, driving the even-row hydraulic struts, even-row top beams and even-row support beams that have no supporting function to move forward one step;

[0024] ④ Then lower the even-row hydraulic props. After the even-row hydraulic prop footing touches the ground, the even-row top beams and even-row support beams begin to play a supporting role.

[0025] ⑤ Lift all odd-row hydraulic supports to remove the odd-row top beams from their original supporting state;

[0026] ⑥ The hydraulic propulsion cylinder contracts, driving the odd-row hydraulic struts, odd-row top beams and odd-row support beams that have no supporting function to move forward one step;

[0027] ⑦Then lower the odd-row hydraulic supports. After the foot of the odd-row hydraulic supports touches the ground, the odd-row top beams begin to play a supporting role.

[0028] After the mining is complete, the mining of the columns in the mining room includes the following steps:

[0029] e. Mining the chambers designed in the intermediate mining columns from right to left, with the mining thickness reaching the full thickness of the ore body;

[0030] Preferably, in step e of the fifth step, the ore rooms in the same mining column are mined simultaneously or sequentially.

[0031] f. Provide timely roof support for the mined mine room;

[0032] Preferably, in step f of the fifth step, the flip beams of the flipped row hydraulic supports are parallel to the odd-row joists and the even-row joists.

[0033] g. transporting the mined ore;

[0034] h. Repeat steps eg until all the rooms are mined;

[0035] Preferably, in step h of the fifth step, when the length of the turnover beam cannot support the mining space, the telescopic beam is gradually extended, and the turnover beam and / or the telescopic beam are supported by a single hydraulic support.

[0036] Step 6: Recover the row hydraulic supports.

[0037] Preferably, the row of hydraulic supports are recovered in sequence from left to right, and the mining columns that are recovering the row of hydraulic supports are separated from the mining columns that are being mined by one or more groups of mining columns.

[0038] Preferably, the recovery steps of the row hydraulic supports are as follows:

[0039] a. Contract and retract the single hydraulic prop and retract the telescopic beam at the same time;

[0040] b. The front row of hydraulic supports is equipped with a rotatable front beam at the front end of the odd-row top beam and the even-row top beam. The rotation angle of the front beam is controlled by a hydraulic cylinder. The recovery steps of the hydraulic supports located within the full mining column are as follows:

[0041] ① Raise the front beam so that the angle between it and the extension lines of the odd-row top beam and the even-row top beam is α;

[0042] ② Lift all odd-row hydraulic supports to remove the odd-row top beams from their original supporting state;

[0043] ③ The hydraulic propulsion cylinder extends, driving the odd-row hydraulic struts, odd-row top beams and odd-row support beams that have no supporting function to move backward by one step;

[0044] ④Then lower the odd-row hydraulic struts. The odd-row hydraulic struts’ column feet touch the ground and the odd-row top beams begin to play a supporting role.

[0045] ⑤ Lift all the even-row hydraulic supports to remove the even-row top beams from their original supporting state;

[0046] ⑥ The hydraulic propulsion cylinder contracts, driving the even-row hydraulic struts, even-row top beams and even-row support beams that have no supporting function to move backward by one step;

[0047] ⑦ Then lower the even-row hydraulic props. After the even-row hydraulic prop foot touches the ground, the even-row top beams and even-row support beams begin to play a supporting role.

[0048] ⑧ Repeat steps ②-⑦ until the row of hydraulic supports in the full-scale columns are retracted, and the front cantilever beam is retracted so that it is in close contact with the bottom surfaces of the odd-row top beams and the even-row top beams.

[0049] The beneficial technical effects of the present invention are as follows: Compared with existing methods, the bauxite mining method of the present invention does not leave a protective roof, and the entire ore layer is mined at once. The roof is supported by the row of hydraulic supports, which not only mines the protective roof layer without wasting bauxite resources, but also ensures the safety of personnel and equipment in the mining area without affecting normal production operations. After being withdrawn, the row of hydraulic supports can be recycled, maximizing support cost savings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1This is a schematic plan view of the bauxite mining method without leaving a roof guard;

[0051] Figure 2 yes Figure 1 A partial enlarged schematic diagram;

[0052] Figure 3 This is a top view of the row hydraulic support of the present invention;

[0053] Figure 4 This is a front view of the row hydraulic support of the present invention;

[0054] Figure 5 This is an exploded schematic diagram of the present invention's row of hydraulic supports moving one step;

[0055] Figure 6 It is a schematic diagram of the row of hydraulic supports of the present invention lifting the front beam.

[0056] In the figure, 1. Transport tunnel; 2. Return air tunnel; 3. Cutting shaft; 4. Top pillar; 5. Bottom pillar; 6. Intermediate pillar; 7. Mine pillar; 8. Mine room; 9. Full-mined strip pillar; 10. Blast hole; 11. Row hydraulic support; 12. Hydraulic propulsion cylinder; 13. Odd-row hydraulic support; 14. Even-row hydraulic support; 15. Odd-row top beam; 16. Even-row top beam; 17. Odd-row supporting beam; 18. Even-row supporting beam; 19. Single hydraulic support; 20. Turning beam; 21. Front cantilever beam; 22. Telescopic beam; 23. Hydraulic cylinder. DETAILED DESCRIPTION

[0057] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0058] The present invention proposes a bauxite mining method without leaving ore top protection, which is particularly suitable for gently inclined ore bodies, such as Figure 1-6 As shown, the following steps are included:

[0059] The first step is to divide a certain stage of the ore body into several ore blocks along the ore body strike direction, and leave pillars 6 between adjacent ore blocks; that is, between two adjacent pillars 6 is a mining ore block. Figure 1 In the middle is a mining block;

[0060] Step 2: Excavate a transport tunnel 1 along the ore body at the bottom of the ore block. The transport tunnel 1 is connected to the stage transport tunnel. The bottom of the transport tunnel 1 is a bottom pillar 5. Excavate a return air tunnel 2 along the ore body at the top of the ore block. The return air tunnel 2 is connected to the stage return air tunnel. The top of the return air tunnel 2 is a top pillar 4.

[0061] Step 3: Arrange a cutting shaft 3 along the ore body inclination beside the intermediate pillar 6 on the right side of the ore block, connecting the transport tunnel 1 and the return air tunnel 2 to form a ventilation system;

[0062] Step 4: Divide the ore block into several groups of mining columns along the strike of the ore body. Each group of mining columns includes an intermediate mining column on the left and a full mining column 9 on the right. The width of the intermediate mining column is b, and the length is the width of the ore block between the transport roadway 1 and the return air roadway 2. The intermediate mining columns are arranged at intervals along the inclination of the ore body as pillars 7 and mine rooms 8. The length of the pillar 7 is b, and the length of the mine room 8 is c. The pillar 7 is not mined, and the mine room 8 is mined. The full mining column 9 is a, and the length is the width of the ore block between the transport roadway 1 and the return air roadway 2. All the full mining columns 9 are mined.

[0063] Step 5: Mining each group of mining columns from left to right in turn; the mining steps for each group of mining columns are:

[0064] a. Mining the entire strip 9 from the transport tunnel 1 toward the return air tunnel 2 (i.e., from bottom to top). The mining thickness is the full thickness of the ore body. Rock drilling is performed using a rock drill, and explosive blasting is performed to drop the ore. The direction of the blasthole 10 during drilling is consistent with the inclination direction of the ore body.

[0065] b. Use the row of hydraulic supports 11 to promptly support the roof of the mining space. Workers work under the support of the row of hydraulic supports 11 to prevent the roof from falling off and ensure the safety of life and equipment;

[0066] c. The mined ore is loaded into mining trucks using scrapers and transported out through transport tunnel 1;

[0067] d. Repeat step a; and promptly move the row of hydraulic supports 11 forward in the direction of mining. When the length of the row of hydraulic supports 11 cannot support the mining space, add a new row of hydraulic supports 11; the width of the row of hydraulic supports 11 is a; repeat step c; until the mining column 9 is completely mined;

[0068] like Figure 2-4 As shown, each row of hydraulic supports 11 includes several rows of odd-row hydraulic supports 13 and even-row hydraulic supports 14 arranged at intervals from front to back, and each row of odd-row hydraulic supports 13 and each row of even-row hydraulic supports 14 include at least two hydraulic supports; the tops of the odd-row hydraulic supports 13 are connected to odd-row joists 17, and the tops of the even-row hydraulic supports 14 are connected to even-row joists 18; all odd-row joists 17 are fixed together by several odd-row top beams 15, and each odd-row top beam 15 is fixedly connected to the tops of all odd-row joists 17; all even-row joists The beams 18 are fixed together by a plurality of even-row top beams 16, and each even-row top beam 16 is fixedly connected to the tops of all even-row joists 18; the odd-row top beams 15, the even-row top beams 16, the odd-row joists 17, and the even-row joists 18 are arranged perpendicularly, and the odd-row top beams 15 and the even-row top beams 16 are arranged at intervals in the left-right direction; the odd-row top beams 15 are slidably connected to the tops of the even-row joists 18, and the even-row top beams 16 are slidably connected to the tops of the odd-row joists 17; wherein, a hydraulic propulsion cylinder 12 is provided between adjacent odd-row joists 17 and even-row joists 18;

[0069] refer to Figure 4 The odd-row joists 17 and the even-row joists 18 are hingedly connected to a flip beam 20 on the left side, and a retractable telescopic beam 22 is provided inside the flip beam 20; the flip beam 20 and / or the telescopic beam 22 can be supported by a single hydraulic support 19;

[0070] The forward movement of the row of hydraulic supports 11 in step b and step d is as follows: Figure 5 As shown, taking the forward step d as an example, the forward method is:

[0071] ① Odd-row hydraulic struts 13 and even-row hydraulic struts 14 respectively support odd-row joists 17 and even-row joists 18, thereby respectively supporting odd-row top beams 15 and even-row top beams 16 on the roof; both odd-row hydraulic struts 13 and even-row hydraulic struts 14 maintain supporting force;

[0072] ② Only lift all the even-row hydraulic supports 14, so that the even-row top beams 16 are separated from the original supporting state, while the odd-row top beams 15 continue to support the roof and maintain the supporting force;

[0073] ③ The hydraulic propulsion cylinder 12 extends, driving the even-row hydraulic struts 14, even-row top beams 16 and even-row support beams 18, which have no supporting function, to move forward a step distance d;

[0074] ④ Then lower the even-row hydraulic struts 14. After the foot of the even-row hydraulic struts 14 touches the ground, the even-row top beams 16 and even-row support beams 18 begin to play a supporting role.

[0075] ⑤ Only lift all the odd-row hydraulic supports 13, so that the odd-row top beams 15 are separated from the original supporting state, while the even-row top beams 16 continue to support the roof and maintain the supporting force;

[0076] ⑥ The hydraulic propulsion cylinder 12 contracts, driving the odd-row hydraulic struts 13, odd-row top beams 15 and odd-row joists 17, which have no supporting function, to move forward a step distance d;

[0077] ⑦ Then lower the odd row hydraulic support 13. After the column feet of the odd row hydraulic support 13 touch the ground, the odd row top beam 15 begins to play a supporting role.

[0078] After the mining of the complete mining column 9, the mining column is collected in the mining room, including the following steps:

[0079] e from right to left between the mining column designed in the mine room 8 for mining, mining thickness is the full thickness of the ore body, all mines can be mined simultaneously, can also be mined sequentially; from right to left using a rock drill drilling, charging blasting ore, each row of blastholes 10 in the direction and the ore body tilt direction consistent;

[0080] f. The flip beam 20 of the flip-row hydraulic support 11 is parallel to the odd-row joists 17 and the even-row joists 18. The flip beam 20 is supported by a single hydraulic support 19, thereby timely supporting the roof of the mining space. Workers work under the support of the flip beam 20 to prevent the roof from falling off, ensuring the safety of life and equipment;

[0081] g. The mined ore is loaded into mining trucks by scrapers and transported out through transport tunnel 1;

[0082] h. Repeat step e; when the length of the flip beam 20 cannot support the mining space, gradually extend the telescopic beam 22, using a single hydraulic support 19 to support the flip beam 20 and the telescopic beam 22; repeat step f; so until the mining room 8 is completed;

[0083] Step 6: Recover the row hydraulic supports 11 in sequence from left to right, and lag behind one or more groups (e.g., two groups) of mining columns to recover the row hydraulic supports 11, that is, the mining columns that are recovering the row hydraulic supports 11 are separated from the mining columns that are recovering by one or more groups of mining columns; the recovery steps of the row hydraulic supports 11 are as follows:

[0084] a. Contraction of the single hydraulic support 19 and recovery, while retracting the telescopic beam 22, this time the flip beam 20 rotates 90 ° counterclockwise, under the effect of its own weight in a vertical shape; the row of hydraulic supports 11 in the mine room 8 are partially recovered;

[0085] b. The front row hydraulic support 11 is provided with a rotatable front beam 21 at the front end of the odd-row top beam 15 and the even-row top beam 16. The front beam 21 is controlled by a hydraulic cylinder 23 so that it can rotate around the front end of the odd-row top beam 15 and the even-row top beam 16; the recovery steps of the row hydraulic support 11 located within the full mining column 9 are as follows:

[0086] ① Raise the front beam 21 so that the angle between it and the extension lines of the odd-row top beam 15 and the even-row top beam 16 is α; when the top plate collapses during recovery, the front beam 21 can play a protective role;

[0087] ② Only lift all the odd-row hydraulic supports 13, so that the odd-row top beams 15 are separated from the original supporting state, while the even-row top beams 16 continue to support the roof and maintain the supporting force;

[0088] ③ The hydraulic propulsion cylinder 12 extends, driving the odd-row hydraulic struts 13, odd-row top beams 15 and odd-row joists 17, which have no supporting function, to move backward by a step distance d;

[0089] ④ Then lower the odd-row hydraulic struts 13, and the odd-row hydraulic struts 13 column feet touch the ground and the odd-row top beams 15 begin to play a supporting role;

[0090] ⑤ Only lift all the even-row hydraulic supports 14, so that the even-row top beams 16 are separated from the original supporting state, while the odd-row top beams 15 continue to support the roof and maintain the supporting force;

[0091] ⑥ The hydraulic propulsion cylinder 12 contracts, driving the even-row hydraulic struts 14, even-row top beams 16 and even-row support beams 18, which have no supporting function, to move backward by a step distance d;

[0092] ⑦ Then lower the even-row hydraulic props 14. After the even-row hydraulic props 14 foot contact the ground, the even-row top beams 16 and even-row joists 18 begin to play a supporting role.

[0093] ⑧ Repeat steps ②-⑦ until the row of hydraulic supports 11 in the entire mining column are retracted, and the front cantilever beam 21 is retracted so that it is in close contact with the bottom surface of the odd-row top beam 15 and the even-row top beam 16.

[0094] Of course, the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above-mentioned embodiments. It should be noted that all equivalent substitutions and obvious deformation forms made by any technician familiar with this field under the guidance of this specification fall within the substantive scope of this specification and should be protected by the present invention.

Claims

1. A bauxite mining method without leaving a roof for protection, characterized in that: The following steps are involved: Step 1: Divide a certain stage of the ore body into several blocks along the ore body strike, and leave pillars between adjacent blocks; Step 2: Excavate a transport tunnel along the ore body at the bottom of the ore block; excavate a return air tunnel along the ore body at the top of the ore block; Step 3: Arrange a cutting shaft along the ore body inclination beside the intermediate pillar on the right side of the ore block to connect the transport tunnel and the return air tunnel; Step 4: Divide the ore block into several groups of mining columns along the strike of the ore body. Each group of mining columns includes an intermediate mining column on the left and a full mining column on the right. The intermediate mining columns are arranged at intervals along the inclination of the ore body as pillars and mine rooms. The pillars are not mined, the mine rooms are mined, and the full mining columns are fully mined. Step 5: Mining each group of mining columns from left to right in turn; the mining steps for each group of mining columns are: a. Mining is carried out in full strips from the transport roadway to the return air roadway, and the mining thickness is the full thickness of the ore body; b. Use row hydraulic supports to timely support the roof of the mining space; c. transporting the mined ore; d. Repeat step a; and promptly move the row of hydraulic supports forward in the direction of mining. When the length of the row of hydraulic supports cannot support the mining space, add a new row of hydraulic supports; repeat step c; until the mining column is fully mined; Each row of hydraulic supports includes several rows of odd-row hydraulic supports and even-row hydraulic supports arranged at intervals from front to back, and each row of odd-row hydraulic supports and each row of even-row hydraulic supports includes at least two hydraulic supports; the tops of the odd-row hydraulic supports are connected to odd-row joists, and the tops of the even-row hydraulic supports are connected to even-row joists; all odd-row joists are fixed together by several odd-row top beams, and each odd-row top beam is fixedly connected to the tops of all odd-row joists; all even-row joists are fixed together by several even-row top beams, and each even-row top beam is fixedly connected to the tops of all even-row joists; the odd-row top beams and even-row top beams are arranged at intervals in the left-right direction; the odd-row top beams are slidably connected to the tops of the even-row joists, and the even-row top beams are slidably connected to the tops of the odd-row joists; a hydraulic propulsion cylinder is provided between adjacent odd-row joists and even-row joists; After the mining is complete, the mining process is repeated to extract the bars, including the following steps: e. Mining the chambers designed in the intermediate mining columns from right to left, with the mining thickness reaching the full thickness of the ore body; f. Provide timely roof support for the mined mine room; g. transporting the mined ore; h. Repeat steps eg until all the rooms are mined; Step 6: Recover the row of hydraulic supports from left to right in sequence, and the mining columns that are recovering the row of hydraulic supports are separated from the mining columns that are being mined by one or more groups of mining columns.

2. The bauxite mining method according to claim 1, characterized in that: In the second step, the bottom of the transport tunnel is the bottom pillar and the top of the return air tunnel is the top pillar; in the fourth step, the length of the mining column is the width of the ore block between the transport tunnel and the return air tunnel.

3. The bauxite mining method according to claim 1, characterized in that: The width of the row of hydraulic supports is the same as the width of the full-mining columns.

4. The bauxite mining method according to claim 1, characterized in that: A hydraulic propulsion cylinder is provided between an adjacent odd-row joist and an adjacent even-row joist.

5. The bauxite mining method according to claim 1, characterized in that: The odd-row joists and the even-row joists are hinged with a flip beam on the left side, and a retractable telescopic beam is arranged inside the flip beam; the flip beam and / or the telescopic beam are supported by a single hydraulic support.

6. The bauxite mining method according to claim 1 or 5, characterized in that: In the fifth step, the forward movement of the row of hydraulic supports in step b and step d is as follows: ① Odd-row hydraulic props and even-row hydraulic props respectively support odd-row joists and even-row joists, thereby enabling odd-row top beams and even-row top beams to support the roof; ② Lift all the even-row hydraulic supports to remove the even-row top beams from their original supporting state; ③ The hydraulic propulsion cylinder extends, driving the even-row hydraulic struts, even-row top beams and even-row support beams that have no supporting function to move forward one step; ④ Then lower the even-row hydraulic props. After the even-row hydraulic prop footing touches the ground, the even-row top beams and even-row support beams begin to play a supporting role. ⑤ Lift all odd-row hydraulic supports to remove the odd-row top beams from their original supporting state; ⑥ The hydraulic propulsion cylinder contracts, driving the odd-row hydraulic struts, odd-row top beams and odd-row support beams that have no supporting function to move forward one step; ⑦Then lower the odd row of hydraulic supports. After the odd row of hydraulic supports’ column feet touch the ground, the odd row of top beams begin to play a supporting role.

7. The bauxite mining method according to claim 1, characterized in that: In step e of the fifth step, the ore rooms in the same mining column are mined simultaneously or sequentially.

8. The bauxite mining method according to claim 5, characterized in that: In step f of the fifth step, the flip beams of the flipped row hydraulic supports are parallel to the odd-row joists and the even-row joists.

9. The bauxite mining method according to claim 8, characterized in that: In step h of the fifth step, when the length of the turnover beam cannot support the mining space, the telescopic beam is gradually extended, and the turnover beam and / or the telescopic beam are supported by a single hydraulic support.

10. The bauxite mining method according to claim 6, characterized in that: The recovery steps of the row hydraulic supports are as follows: a. Contract and retract the single hydraulic prop and retract the telescopic beam at the same time; b. The front row of hydraulic supports is equipped with a rotatable front beam at the front end of the odd-row top beam and the even-row top beam. The rotation angle of the front beam is controlled by a hydraulic cylinder. The recovery steps of the hydraulic supports located within the full mining column are as follows: ① Raise the front beam so that the angle between it and the extension lines of the odd-row top beam and the even-row top beam is α; ② Lift all odd-row hydraulic supports to remove the odd-row top beams from their original supporting state; ③ The hydraulic propulsion cylinder extends, driving the odd-row hydraulic struts, odd-row top beams and odd-row support beams that have no supporting function to move backward by one step; ④Then lower the odd-row hydraulic struts. The odd-row hydraulic struts’ column feet touch the ground and the odd-row top beams begin to play a supporting role. ⑤ Lift all the even-row hydraulic supports to remove the even-row top beams from their original supporting state; ⑥ The hydraulic propulsion cylinder contracts, driving the even-row hydraulic struts, even-row top beams and even-row support beams that have no supporting function to move backward by one step; ⑦ Then lower the even-row hydraulic props. After the even-row hydraulic prop foot touches the ground, the even-row top beams and even-row support beams begin to play a supporting role. ⑧ Repeat steps ②-⑦ until the row of hydraulic supports in all the columns are retracted, and the front cantilever beam is retracted so that it is in close contact with the bottom surface of the odd-row top beam and the even-row top beam.

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