Roadway supporting device for downward mining of coal seam group

Abstract

The utility model discloses a roadway supporting device for coal seam group descending mining, and relates to the technical field of coal mining, the roadway supporting device comprises a roadway supporting structure, an upper-layer coal roadway corresponding to an upper coal seam, a middle-layer coal roadway corresponding to a middle coal seam, and a lower-layer coal roadway corresponding to a lower coal seam; at least three single hydraulic props are arranged between the roadway top plate and the roadway bottom plate corresponding to the middle-layer coal roadway and the lower-layer coal roadway respectively, the top ends of the single hydraulic props abut against the roadway top plate, the bottom ends of the single hydraulic props abut against the roadway bottom plate, and the single hydraulic props are perpendicular to the roadway top plate; and anchor net cable roadway supporting structures are respectively arranged at the roadway top plate, the roadway bottom plate, the roadway left side and the roadway right side corresponding to the middle-layer coal roadway and the lower-layer coal roadway. The supporting structure has the characteristics of high-strength yielding and reliable supporting, and can effectively solve the problems of roadway deformation of the next coal seam, high supporting cost, repeated maintenance and low working efficiency in multi-coal-seam combined arrangement mining.

Description

Technical Field

[0001] This application relates to the technical field of coal mine mining, and particularly to a roadway support device for downward mining of coal seams in a coal seam group. Background Art

[0002] In the combined layout mining of multiple coal seams underground in a coal mine, the layout of the gateways in the lower overlying coal seams is affected by the mining pressure of the upper overlying coal seams. The gateways in the lower overlying coal seams need to be constructed after the mining pressure of the upper overlying coal seams stabilizes after the end of mining. That is, for the layout of the gateways in the lower overlying coal seams within the influence range of the mining pressure during the mining of the upper overlying coal seam working face, after the mining of the upper overlying coal seam, it is necessary to wait for 3 to 5 months for stable subsidence before the transportation gateway and the return airway of the lower overlying coal seam can be arranged and constructed; during the construction of the gateways in the lower overlying coal seams, the relationship between the gateway layout and the strata position of the goaf in the upper overlying coal seam is affected by the lateral mining pressure, and it is easy to cause roof subsidence to form a net pocket, roadway rib heaving, and floor heaving, etc., resulting in roadway disrepair, increasing the maintenance cost. At the same time, the roof pressure is large during tunneling, which is easy to cause roof safety accidents. Utility Model Content

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this reason, this application proposes a roadway support device for downward mining of coal seams in a coal seam group, which has the support characteristics of high strength yielding, safety, and reliability, and can effectively solve the problems of roadway deformation, high support cost, repeated maintenance, and low work efficiency in the combined layout mining of multiple coal seams.

[0004] This application provides a roadway support device for downward mining of coal seams in a coal seam group, including:

[0005] A roadway support structure, an upper coal roadway corresponding to the upper coal seam, a middle coal roadway corresponding to the middle coal seam, and a lower coal roadway corresponding to the lower coal seam;

[0006] The upper coal roadway is arranged above the middle coal roadway, the middle coal roadway is arranged above the lower coal roadway, the roadway support structure includes three roadway support components corresponding to the upper coal roadway, the middle coal roadway, and the lower coal roadway respectively, and each roadway support component includes a roadway roof, a roadway floor, a roadway left rib, and a roadway right rib. The roadway left rib and the roadway right rib are respectively arranged on the roadway floor, and the roadway roof is arranged above the roadway left rib and the roadway right rib. The roadway roof, the roadway floor, the roadway left rib, and the roadway right rib enclose to form the corresponding upper coal roadway, or middle coal roadway, or lower coal roadway;

[0007] At least three single hydraulic props are provided between the roadway roof and the roadway floor corresponding to the middle coal roadway and the lower coal roadway respectively. The top end of the single hydraulic prop abuts against the roadway roof, the bottom end of the single hydraulic prop abuts against the roadway floor, the single hydraulic prop is perpendicular to the roadway roof, and the three single hydraulic props are evenly distributed;

[0008] Anchor mesh cable roadway support structures are respectively provided at the roadway roof, the roadway floor, the left roadway side, and the right roadway side corresponding to the middle coal roadway and the lower coal roadway respectively.

[0009] According to some embodiments of the present application, the anchor mesh cable roadway support structure includes an anchor mesh, a plurality of anchor bolts and a plurality of anchor cables. The ends of the anchor bolts and the anchor cables corresponding to the roadway roof can pass through the surrounding rock loosening circle range of the roadway roof and be located in the interlayer rock stratum. The ends of the anchor bolts and the anchor cables corresponding to the roadway floor can pass through the surrounding rock loosening circle range of the roadway floor and be located in the interlayer rock stratum. The ends of the anchor bolts and the anchor cables corresponding to the left roadway side can pass through the surrounding rock loosening circle range of the left roadway side and be located in the solid coal or rock stratum. The ends of the anchor bolts and the anchor cables corresponding to the right roadway side can pass through the surrounding rock loosening circle range of the right roadway side and be located in the solid coal or rock stratum. The anchor bolts and the anchor cables are both perpendicular to the corresponding roadway roof. The anchor mesh is arranged on the corresponding roadway roof, or the roadway floor, or the left roadway side, or the right roadway side through the plurality of anchor bolts and / or the plurality of anchor cables.

[0010] According to some embodiments of the present application, the anchor bolts are all deformed steel bolts. The anchor mesh cable roadway support structure further includes a bearing beam. The bearing beam is fixedly arranged at the corresponding roadway roof, or the roadway floor, or the left roadway side, or the right roadway side. A plurality of drill holes are formed in the bearing beam. Each anchor cable is correspondingly provided with a locking device. The drill holes correspond to the anchor cables one by one. The anchor cables are fastened in the corresponding drill holes through the corresponding locking devices.

[0011] According to some embodiments of the present application, the anchor mesh is a rectangular anchor mesh.

[0012] According to some embodiments of the present application, the plurality of anchor bolts and the plurality of anchor cables in each anchor mesh cable roadway support structure are arranged at intervals in sequence.

[0013] According to some embodiments of the present application, the lateral distance between the middle coal roadway and the upper coal roadway is a first preset lateral safety distance, and the lateral distance between the lower coal roadway and the middle coal is a second preset lateral safety distance.

[0014] In this application, the roadway roof of the middle coal roadway located below the upper coal roadway and the roadway roof of the lower coal roadway located below the middle coal roadway adopt an anchor net cable roadway support structure combined with single hydraulic props for combined support, effectively controlling the situation that the roadway roof of the lower coal seam in the downward mining of coal seam groups is prone to bedding separation due to the influence of the overlying coal seam abutment pressure, the stress in the coal and rock mass, and the advanced stress; by setting up the anchor net cable roadway support structure and strengthening it with the anchor net cable ladder support, the shear and compression resistance of the rock strata in a certain range of the corresponding roadway roof, roadway floor, roadway left side, and roadway right side is improved, forming a strengthened bearing arch to resist the deformation of the roadway surrounding rock and achieving the purpose of supporting and maintaining the middle coal roadway and the lower coal roadway. Through this setting, this application has the support characteristics of high strength yielding, safety, and reliability, and can effectively solve the problems of roadway deformation, high support cost, repeated maintenance, and low work efficiency in the combined layout and mining of multiple coal seams.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The additional aspects and advantages of the present application will become apparent and be easily understood in conjunction with the following description of the embodiments with reference to the accompanying drawings, in which:

[0017] Figure 1 is a schematic structural diagram of a roadway support device for downward mining of coal seam groups provided by an embodiment of the present application;

[0018] Figure 2 is a schematic cross-sectional view of a roadway designed for downward mining of coal seam groups provided by an embodiment of the present application;

[0019] Figure 3 is a schematic cross-sectional view of a roadway designed for upward mining of coal seam groups provided by an embodiment of the present application.

[0020] Reference Signs:

[0021] Upper coal seam 110, upper coal roadway 111, middle coal seam 120, middle coal roadway 121, lower coal seam 130, lower coal roadway 131;

[0022] Roadway roof 140, roadway floor 141, roadway left side 142, roadway right side 143, single hydraulic prop 144, anchor cable 145, anchor bolt 146. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0024] In the description of the present application, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application.

[0025] In the description of the present application, if the first and the second are described only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence of the indicated technical features.

[0026] In the description of the present application, unless otherwise clearly defined, terms such as "set", "install", "connect" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0027] In the combined mining of multiple coal seams underground in a coal mine, the layout of the gateways in the underlying coal seam is affected by the mining of the overlying coal seam. The gateways in the underlying coal seam need to be constructed after the mining pressure of the overlying coal seam stabilizes after the mining of the overlying coal seam is completed. That is, for the layout of the gateways in the underlying coal seam within the influence range of the mining pressure of the overlying coal seam working face, after the mining of the overlying coal seam, after a stable settlement period of 3 to 5 months, the transportation gateway and the return airway of the underlying coal seam can be laid out and constructed; during the construction of the gateways in the underlying coal seam, the relationship between the gateway layout and the goaf horizon of the overlying coal seam is affected by the mining lateral pressure, and it is easy to cause roof subsidence to form a mesh pocket, roadway rib spalling, floor heave, etc., resulting in roadway disrepair and increasing the maintenance cost. At the same time, the roof pressure is large during tunneling, and it is easy to cause roof safety accidents.

[0028] To solve the above problems, the present application proposes a roadway support device for downward mining of coal seam groups. The embodiments of the present application will be further described below with reference to the accompanying drawings.

[0029] Refer to Figures 1 to 2, this application provides a roadway support device for downward mining of coal seam groups, including: a roadway support structure, an upper coal roadway 111 corresponding to the upper coal seam 110, a middle coal roadway 121 corresponding to the middle coal seam 120, and a lower coal roadway 131 corresponding to the lower coal seam 130; the upper coal roadway 111 is arranged above the middle coal roadway 121, and the middle coal roadway 121 is arranged above the lower coal roadway 131. The roadway support structure includes three roadway support components corresponding to the upper coal roadway 111, the middle coal roadway 121, and the lower coal roadway 131 respectively. Each roadway support component includes a roadway roof 140, a roadway floor 141, a roadway left side 142, and a roadway right side 143. The roadway left side 142 and the roadway right side 143 are respectively arranged on the roadway floor 141, and the roadway roof 140 is arranged above the roadway left side 142 and the roadway right side 143. The roadway roof 140, the roadway floor 141, the roadway left side 142, and the roadway right side 143 enclose to form the corresponding upper coal roadway 111, or middle coal roadway 121, or lower coal roadway 131; at least three single hydraulic props 144 are arranged between the roadway roof 140 and the roadway floor 141 corresponding to the middle coal roadway 121 and the lower coal roadway 131 respectively. The top end of the single hydraulic prop 144 abuts against the roadway roof 140, and the bottom end of the single hydraulic prop 144 abuts against the roadway floor 141. The single hydraulic prop 144 is arranged perpendicular to the roadway roof 140, and the three single hydraulic props 144 are evenly distributed; anchor net cable roadway support structures are respectively arranged at the roadway roof 140, the roadway floor 141, the roadway left side 142, and the roadway right side 143 corresponding to the middle coal roadway 121 and the lower coal roadway 131 respectively.

[0030] In some embodiments, three single hydraulic props 144 are arranged, and the three single hydraulic props 144 are evenly distributed between the roadway roof 140 and the roadway floor 141. One of the single hydraulic props 144 is arranged close to the roadway center line, and the other two single hydraulic props 144 are respectively arranged close to the corresponding roadway left side 142 and roadway right side 143.

[0031] In this application, the roadway roof 140 of the middle coal roadway 121 located below the upper coal roadway 111 and the roadway roof 140 of the lower coal roadway 131 located below the middle coal roadway 121 adopt the bolt-net-cable roadway support structure and are jointly supported in combination with single hydraulic props 144, effectively controlling the situation that the roadway roof 140 is extremely prone to bedding separation during the downward mining of the coal seam group for the lower coal seam due to the abutment pressure of the upper coal seam 110, the stress in the coal and rock mass, and the advance stress. By setting up the bolt-net-cable roadway support structure and strengthening it with the bolt-net-cable ladder support, the shear and compression resistance of the rock strata in a certain range of the corresponding roadway roof 140, roadway floor 141, roadway left side 142, and roadway right side 143 is improved, forming a strengthened bearing arch to resist the deformation of the roadway surrounding rock and achieving the purpose of supporting and maintaining the middle coal roadway 121 and the lower coal roadway 131. With this setting, this application has the support characteristics of high strength, yielding, safety, and reliability, and can effectively solve the problems of roadway deformation, high support cost, repeated maintenance, and low work efficiency in the combined layout and mining of multiple coal seams.

[0032] Referring to Figure 1 , it can be understood that the bolt-net-cable roadway support structure includes a bolt-net, multiple bolts 146, and multiple cables 145. The ends of the bolts 146 and cables 145 corresponding to the roadway roof 140 can pass through the loosening circle range of the surrounding rock of the roadway roof 140 and be located in the interlayer rock strata. The ends of the bolts 146 and cables 145 corresponding to the roadway floor 141 can pass through the loosening circle range of the surrounding rock of the roadway floor 141 and be located in the interlayer rock strata. The ends of the bolts 146 and cables 145 corresponding to the roadway left side 142 can pass through the loosening circle range of the surrounding rock of the roadway left side 142 and be located in the solid coal or rock strata. The ends of the bolts 146 and cables 145 corresponding to the roadway right side 143 can pass through the loosening circle range of the surrounding rock of the roadway right side 143 and be located in the solid coal or rock strata. The bolts 146 and cables 145 are both perpendicularly arranged with the corresponding roadway roof 140. The bolt-net is arranged on the corresponding roadway roof 140, or roadway floor 141, or roadway left side 142, or roadway right side 143 through multiple bolts 146 and / or multiple cables 145.

[0033] It should be noted that the bolt-net-cable roadway support structure is a new type of hybrid support technology that combines bolts 146, cables 145, and bolt-nets to jointly support the roadway roof 140. Its action principle is to use the bolt-net-cable ladder support to strengthen and improve the shear and compression resistance of the rock strata in a certain range of the roadway roof 140, form a strengthened bearing arch, resist the deformation of the roadway surrounding rock, and achieve the purpose of supporting and maintaining the roadway. Its specific function is to end-anchor the top bolts 146 under a certain pre-tightening force, so that the composite rock strata within the end-anchoring range form a combined beam under the elastic compression of the bolts 146. At the same time, the cables 145 anchored in the stable rock strata are used to suspend the combined beam under a certain pre-tightening force to further enhance the support strength of the combined beam.

[0034] In some embodiments, referring to Figure 1 , three cable bolts 145 and three rock bolts 146 are arranged on the left sidewall 142 of the roadway. The cable bolts 145 and the rock bolts 146 are arranged in an interspersed manner. The rock bolt 146 arranged in the middle position is perpendicular to the left sidewall 142 of the roadway, and the other two rock bolts 146 form an angle of 75° with the left sidewall 142 of the roadway; three cable bolts 145 and three rock bolts 146 are arranged on the floor 141 of the roadway. The cable bolts 145 and the rock bolts 146 are arranged in an interspersed manner. The rock bolt 146 arranged in the middle position is perpendicular to the floor 141 of the roadway, and the other two rock bolts 146 form an angle of 75° with the floor 141 of the roadway; two cable bolts 145 and two rock bolts 146 are arranged on the right sidewall 143 of the roadway. The cable bolts 145 and the rock bolts 146 are arranged in an interspersed manner. In other embodiments, other quantities of rock bolts 146 and cable bolts 145 may also be set, without being limited to the embodiments of the present application.

[0035] It can be understood that the rock bolts 146 are all deformed steel bolts. The bolt-mesh-cable roadway support structure further includes a bearing beam, which is fixedly arranged at the corresponding roadway roof 140, or the floor 141 of the roadway, or the left sidewall 142 of the roadway, or the right sidewall 143 of the roadway. A plurality of drill holes are formed in the bearing beam. Each cable bolt is correspondingly provided with a locking device. The drill holes correspond to the cable bolts one by one, and the cable bolts are fastened in the corresponding drill holes through the corresponding locking devices.

[0036] It should be noted that the bearing beam is a key component of the bolt-mesh-cable roadway support structure. It connects the single deformed steel bolts to form an integral load-bearing structure, which can significantly improve the overall effect of the support of the rock bolts 146.

[0037] It should be noted that the bearing beam can be one of a steel plate beam, a steel bar beam, and a W-shaped steel strip, and the embodiments of the present application do not make any limitations here.

[0038] It can be understood that the bolt-mesh is a rectangular bolt-mesh.

[0039] It should be noted that the rectangular mesh is woven from metal wires and is diamond-shaped. It can effectively prevent rock caving and support the ground surface. Preventing rock caving: The main functions of the bolt-mesh are as follows: (1) In the bolt-mesh-cable roadway support structure, the caving of rocks is one of the most serious problems. The rectangular mesh can effectively prevent rock caving through its tight structure and high-strength metal wires, and ensure the stability and safety of the support structure; (2) Supporting the roof and sidewalls: The metal wire structure of the rectangular mesh can support the roof and sidewalls, and disperse the tension of the cable bolts 145 and the rock bolts 146, reducing the pressure of the single rock bolt and cable bolt on the roadway; (3) Tensile and shear resistance: The material, shape, and structural design of the rectangular mesh are very scientific, and it can effectively resist the tensile and shear failures caused by roadway deformation, thereby improving the support effect.

[0040] Referring toFigure 1 It can be understood that the multiple bolts 146 and the multiple cable bolts 145 in each bolt-cable bolt roadway support structure are arranged at intervals in sequence.

[0041] It should be noted that by arranging the bolts 146 and the cable bolts 145 in an interspersed manner, the bolts 146 can achieve full-length anchoring. After strengthening the support with the cable bolts 145, the deformation of the surrounding rock of the roadway under the coal pillar can be effectively controlled.

[0042] Referring to Figure 2 It can be understood that the lateral distance between the middle coal roadway 121 and the upper coal roadway 111 is the first preset lateral safety distance, and the lateral distance between the lower coal roadway 131 and the middle coal is the second preset lateral safety distance.

[0043] It should be noted that referring to Figure 2 when mining in the downward direction of the coal seam group, X3 represents the first preset lateral safety distance, and X4 represents the second preset lateral safety distance; referring to Figure 3 when mining in the upward direction of the coal seam group, X1 represents the preset safety lateral distance between the upper coal roadway 111 and the middle coal roadway 121, and X2 represents the preset safety lateral distance between the middle coal roadway 121 and the lower coal roadway 131.

[0044] It should be noted that the mining of a coal seam group with combined layout of multiple coal seams is a mining method in a coal mine field with multiple closely spaced coal seams. According to the distance between coal seams, coal thickness, and the hardness of rock strata, during the mining process, reasonable roadway layout is the premise for ensuring safe and efficient coal seam mining. The manifestation of mining-induced pressure on the roadway layout in different areas directly affects the service life of the roadway. Verifying the rationality of the roadway layout based on field observations is particularly prominent in terms of support cost, tunneling efficiency, and coal mine excavation and connection. Therefore, how to reasonably layout the roadways for combined mining of multiple coal seams is particularly important.

[0045] Exemplarily, the distance between the upper coal seam 110 and the middle coal seam 120 in this embodiment is 30 m, and the distance between the middle coal seam 120 and the lower coal seam 130 is 19 m.

[0046] In this embodiment, through the research and analysis of the lateral pressure manifestation of multi-seam roadways in a certain mining area, the influence range of the lateral pressure in the combined mining of multi-seams in this mining area is determined, and a roadway support plan is provided for the roadway layout in the combined mining of multi-seams. Exemplarily, first, the research on the lateral pressure of the overlying coal seam mining on the underlying coal seam is analyzed. According to the mine pressure observation and analysis of the roadways of coal seams 5, 8, and 9 that have been mined and excavated in a certain mine, the influence range of the lateral pressure of coal seam 5 mining on the underlying coal seam 8 in the downhill direction is not more than 36 m, the influence range of the lateral pressure of coal seam 8 mining on the underlying coal seam 9 in the downhill direction is not more than 36 m, and the influence range of the lateral pressure of coal seam 8 mining on the underlying coal seam 9 in the uphill direction is not more than 24 m. Among them, coal seam 5 is the upper coal seam 110, coal seam 8 is the middle coal seam 120, and coal seam 9 is the lower coal seam 130.

[0047] Exemplarily, during downward mining, through the analysis of the influence range of the lateral pressure during the mining of the upper coal seam, when the driving roadway layout of the next coal seam is greater than 36 m, the roadway of the next coal seam will not be affected by the mining-induced lateral pressure. That is, in this embodiment, both the first preset lateral safety distance and the second preset lateral safety distance are 36 m. In addition, during the upward mining of the coal seam group, through the analysis of the influence range of the lateral pressure during the mining of the upper coal seam, it is concluded that when the driving roadway layout of the next coal seam is greater than 24 m, the roadway of the next coal seam will not be affected by the mining-induced lateral pressure.

[0048] It should be noted that through the research and analysis of the lateral pressure manifestation of multi-seam roadways in the mining area, the roadway layout relationship in the combined mining of multi-seams is determined, and the problems of roadway deformation, high support cost, repeated maintenance, and low work efficiency of the next coal seam roadway in the combined mining of multi-seams are solved.

[0049] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The above is the preferred embodiment of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and refinements can still be made, and these improvements and refinements are also regarded as the protection scope of the present application.

[0051] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A roadway support device for downward mining of coal seam groups, characterized in that Including: A roadway support structure, an upper coal roadway corresponding to the upper coal seam, a middle coal roadway corresponding to the middle coal seam, and a lower coal roadway corresponding to the lower coal seam; The upper coal roadway is arranged above the middle coal roadway, the middle coal roadway is arranged above the lower coal roadway. The roadway support structure includes three roadway support components corresponding to the upper coal roadway, the middle coal roadway, and the lower coal roadway respectively. Each roadway support component includes a roadway roof, a roadway floor, a roadway left side, and a roadway right side. The roadway left side and the roadway right side are respectively arranged on the roadway floor, and the roadway roof is arranged above the roadway left side and the roadway right side. The roadway roof, the roadway floor, the roadway left side, and the roadway right side enclose to form the corresponding upper coal roadway, or middle coal roadway, or lower coal roadway; At least three single hydraulic props are arranged between the roadway roof and the roadway floor corresponding to the middle coal roadway and the lower coal roadway respectively. The top end of the single hydraulic prop abuts against the roadway roof, the bottom end of the single hydraulic prop abuts against the roadway floor, the single hydraulic prop is perpendicular to the roadway roof, and the three single hydraulic props are evenly distributed; An anchor net cable roadway support structure is respectively arranged at the roadway roof, the roadway floor, the roadway left side, and the roadway right side corresponding to the middle coal roadway and the lower coal roadway.

2. The roadway support device for downward mining of coal seam groups according to claim 1, characterized in that, The anchor net cable roadway support structure includes an anchor net, a plurality of anchor bolts, and a plurality of anchor cables. The ends of the anchor bolts and the anchor cables corresponding to the roadway roof can pass through the surrounding rock loosening circle range of the roadway roof and be located in the interlayer rock formation. The ends of the anchor bolts and the anchor cables corresponding to the roadway floor can pass through the surrounding rock loosening circle range of the roadway floor and be located in the interlayer rock formation. The ends of the anchor bolts and the anchor cables corresponding to the roadway left side can pass through the surrounding rock loosening circle range of the roadway left side and be located in the solid coal or rock formation. The ends of the anchor bolts and the anchor cables corresponding to the roadway right side can pass through the surrounding rock loosening circle range of the roadway right side and be located in the solid coal or rock formation. The anchor bolts and the anchor cables are all arranged perpendicular to the corresponding roadway roof. The anchor net is arranged on the corresponding roadway roof, or roadway floor, or roadway left side, or roadway right side through a plurality of the anchor bolts and / or a plurality of the anchor cables.

3. The roadway support device for downward mining of coal seam groups according to claim 2, characterized in that All the anchor bolts are deformed steel bars. The anchor net cable roadway support structure further includes a bearing beam. The bearing beam is fixedly arranged at the corresponding roadway roof, or roadway floor, or roadway left side, or roadway right side. A plurality of drill holes are formed in the bearing beam. Each anchor cable is correspondingly provided with a locking device. The drill holes correspond to the anchor cables one by one. The anchor cable is fastened in the corresponding drill hole through the corresponding locking device.

4. The roadway support device for downward mining of coal seam groups according to claim 2, characterized in that, The anchor net is a rectangular anchor net.

5. The roadway support device for downward mining of coal seam groups according to claim 2, characterized in that, The plurality of anchor bolts and the plurality of anchor cables in each anchor net cable roadway support structure are arranged at intervals in sequence.

6. The roadway support device for downward mining of coal seam groups according to claim 1, characterized in that, The lateral distance between the middle coal roadway and the upper coal roadway is the first preset lateral safety distance, and the lateral distance between the lower coal roadway and the middle coal is the second preset lateral safety distance.

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