Construction methods of drainage systems

Abstract

This invention provides a method for constructing a drainage system, comprising: arranging a construction boundary drainage roadway at the mining area boundary of the bottom coal seam of multiple coal seams, and arranging a construction drainage channel in the bottom coal seam; arranging a construction drainage channel in the top coal seam of multiple coal seams; arranging construction drainage wells that penetrate each coal seam; arranging drainage pipes within the drainage wells; when arranging working faces in each intermediate coal seam, arranging construction drainage channels in each intermediate coal seam, and arranging the drainage wells at the drainage channels of each intermediate coal seam; the drainage pipes comprising multiple drainage pipe sections, each drainage pipe section corresponding to one of the multiple coal seams; and during mining of each intermediate coal seam, cutting off a predetermined length of pipe section from the bottom of the intermediate coal seam upwards along the drainage pipe section in that intermediate coal seam. This construction method solves the problem of the large amount of engineering work involved in the construction of drainage systems used in existing multi-coal seam mining techniques.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and more specifically, to a method for constructing a drainage system. Background Technology

[0002] Groundwater is a significant hazard in coal mining and production, often affecting work progress, environmental quality, and endangering workers' health.

[0003] In the process of coal mining, when the roof of the coal seam is a strong water-bearing layer, it is necessary to effectively drain the water accumulated in the water-bearing layer of the roof. Only after the water hazard assessment is qualified can the coal resources under the water-bearing layer of the roof be mined.

[0004] Currently, during the mining of multiple coal seams in large-scale coal mines, a complete drainage system is constructed along the boundary of the coal seam mining area, namely a dedicated drainage roadway for the mining area. Then, after the working face is formed, a dedicated drainage channel is constructed to connect with the drainage roadway at the boundary of the mining area. Although this method solves the problem of water hazards in coal mining, the amount of engineering work involved in constructing roadways at the boundary of each coal seam is large, which greatly increases the investment of the mine and the labor intensity of the workers. Summary of the Invention

[0005] The main objective of this invention is to provide a method for constructing a drainage system, thereby solving the problem of the large amount of engineering work involved in the construction of drainage systems used in multi-coal seam mining in the prior art.

[0006] To achieve the above objectives, the present invention provides a method for constructing a drainage system, applicable to the overhead mining face of a multi-coal-seam, high-water-density mine. The method includes: arranging a construction boundary drainage roadway at the mining area boundary of the bottom coal seam of multiple coal seams, and arranging a drainage channel connecting the construction boundary drainage roadway to the bottom coal seam; arranging a construction drainage channel at the top coal seam of multiple coal seams; arranging construction drainage wells, extending along the distribution direction of the multiple coal seams and penetrating each coal seam, with the upper end of the drainage well located at the drainage channel of the top coal seam and the lower end located at the drainage channel of the bottom coal seam; and arranging drainage pipes within the drainage wells along their extension direction, with both ends of the drainage pipes extending to the bottom coal seam. The coal seams are divided into the top and bottom coal seams, with the upper end of the drainage pipe connected to the drainage channel of the top coal seam and the lower end of the drainage pipe connected to the drainage channel of the bottom coal seam. The coal seams other than the top and bottom coal seams are called intermediate coal seams. When setting up working faces in each intermediate coal seam, construction drainage channels are set up in each intermediate coal seam, and drainage wells are located at the drainage channels of each intermediate coal seam. The drainage pipe includes multiple drainage pipe sections, each corresponding to one of the multiple coal seams, and each drainage pipe section is located in the corresponding coal seam. When mining each intermediate coal seam, a predetermined length of pipe is cut off from the drainage pipe section in that intermediate coal seam, starting from the bottom of the intermediate coal seam and moving upwards.

[0007] Furthermore, before arranging the construction drainage wells, the construction method also includes: arranging a water reservoir connected to the boundary drainage tunnel in the bottom coal seam.

[0008] Furthermore, when arranging construction drainage channels in each coal seam, the construction method also includes: erecting support components in the drainage channels of each coal seam, and making the support components contact the top wall of the drainage channel to support the top wall of the drainage channel.

[0009] Furthermore, the support includes a plurality of support portions spaced apart along the extension direction of the drainage channel, each support portion contacting the top wall of the drainage channel.

[0010] Furthermore, the support structure is a stack of timber.

[0011] Furthermore, after cutting off a pre-set length of the drainage pipe section in the intermediate coal seam, the construction method also includes: when there is no water accumulation in the upper old goaf area of ​​the intermediate coal seam, blocking the lower end of the drainage pipe section in the intermediate coal seam.

[0012] Furthermore, methods for blocking the lower end of the drainage pipe section include: using a baffle to block the lower end of the drainage pipe section.

[0013] Furthermore, the baffle is welded to the lower end of the drainage pipe section.

[0014] Furthermore, the preset length is 0.5m.

[0015] Furthermore, the construction method of the drainage well includes: drilling a hole downwards using a riser drill in the drainage channel of the top coal seam, and drilling to the bottom of the bottom coal seam.

[0016] The construction method using the technical solution of this invention includes:

[0017] Construction boundary drainage roadways are arranged at the mining area boundaries of the bottom coal seams of multiple coal seams, and drainage channels connecting the construction boundary drainage roadways are arranged in the bottom coal seams; construction drainage channels are arranged in the top coal seams of multiple coal seams.

[0018] Drainage wells are constructed and extended along the distribution direction of multiple coal seams, penetrating each seam. The upper end of the drainage well is located at the drainage channel of the top coal seam, and the lower end is located at the drainage channel of the bottom coal seam. The multiple coal seams are distributed sequentially from top to bottom.

[0019] Drainage pipes are arranged within the drainage well along its extension direction, with both ends extending to the bottom and top coal seams respectively. The upper end of the drainage pipe connects to the drainage channel of the top coal seam, and the lower end connects to the drainage channel of the bottom coal seam. Among multiple coal seams, those other than the top and bottom seams are intermediate coal seams; that is, multiple coal seams include at least one intermediate coal seam. When setting up working faces in each intermediate coal seam, construction drainage channels are arranged in each intermediate coal seam, and the drainage well is located at the drainage channel of each intermediate coal seam. Multiple coal seams are mined sequentially from top to bottom. For each coal seam, a working face needs to be arranged during mining. Furthermore, for each intermediate coal seam, a construction drainage channel is arranged in that intermediate coal seam when setting up a working face.

[0020] The drainage pipeline comprises multiple drainage pipe sections, each corresponding to a specific coal seam. During the mining of each intermediate coal seam, a predetermined length of pipe is cut from the drainage pipe section in the intermediate coal seam, starting from the bottom and moving upwards. This connects the drainage channel of the intermediate coal seam to the upper end of the drainage pipe section in the lower coal seam, allowing water from the drainage channel of the intermediate coal seam to flow into the drainage pipe section of the lower coal seam. Water then flows along the drainage pipeline to the drainage channel of the bottom coal seam, and finally to the boundary drainage roadway of the bottom coal seam. Additionally, old working water from the roof of the intermediate coal seam can also flow into the drainage pipe section of the intermediate coal seam and through the lower end of the drainage pipe section to the drainage channel of the intermediate coal seam.

[0021] Because the upper end of the drainage pipe is connected to the drainage channel of the top coal seam, water in the drainage channel of the top coal seam flows into the drainage pipe through the upper end of the drainage pipe, and then flows along the drainage pipe to the drainage channel of the bottom coal seam, and then to the boundary drainage roadway of the bottom coal seam. The water in the drainage channel of the bottom coal seam flows directly into the boundary drainage roadway.

[0022] The drainage system constructed using the method of this application can achieve the purpose of drainage in the working face of each coal seam, achieving a good water hazard prevention effect and ensuring the safe mining of coal resources. Moreover, the construction method of this application only requires the construction of the boundary drainage roadway at the bottom coal seam, without the need to construct drainage roadways in each coal seam, reducing the amount of engineering construction and solving the problem of large engineering construction volume in the existing drainage system construction methods used in multi-coal seam mining. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A schematic diagram of the distribution structure of multiple coal seams according to the present invention is shown;

[0025] Figure 2 A schematic diagram of the structural layout of the working face during coal seam mining according to the present invention is shown;

[0026] Figure 3 A schematic diagram of the structure of the drainage well, the boundary drainage tunnel and drainage channel of the bottom coal seam, and the drainage channel of the top coal seam according to the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 10. Drainage channel; 20. Drainage well; 30. Boundary drainage tunnel; 31. Water reservoir; 40. Timber stack;

[0029] 200. Coal seam; 210. Top coal seam; 220. Bottom coal seam; 230. Intermediate coal seam;

[0030] 310, Transport Lane; 320, Return Air Lane; 330, Opening Cut. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] This invention provides a method for constructing a drainage system for overhead mining faces in multi-seam coal mines with large water content. Please refer to [reference needed]. Figures 1 to 3 The construction methods include:

[0035] Construction boundary drainage roadways 30 are arranged at the mining area boundary of the bottom coal seam 220 of multiple coal seams 200, and a drainage channel 10 connected to the boundary drainage roadway 30 is arranged in the bottom coal seam 220; a construction drainage channel 10 is arranged in the top coal seam 210 of multiple coal seams 200.

[0036] Construction drainage wells 20 are arranged and extended along the distribution direction of multiple coal seams 200, penetrating each coal seam 200. The upper end of the drainage well 20 is located at the drainage channel 10 of the top coal seam 210, and the lower end of the drainage well 20 is located at the drainage channel 10 of the bottom coal seam 220. The multiple coal seams 200 are distributed sequentially from top to bottom.

[0037] Drainage pipes are arranged within the drainage well 20 along its extension direction, with both ends of the drainage pipes extending to the bottom coal seam 220 and the top coal seam 210, respectively. The upper end of the drainage pipe is connected to the drainage channel 10 of the top coal seam 210, and the lower end of the drainage pipe is connected to the drainage channel 10 of the bottom coal seam 220. Among the multiple coal seams 200, the coal seams 200 other than the top coal seam 210 and the bottom coal seam 220 are intermediate coal seams 230, that is, the multiple coal seams 200 include at least one intermediate coal seam 230. When working faces are arranged in each intermediate coal seam 230, construction drainage channels 10 are arranged in each intermediate coal seam 230, and the drainage well 20 is located at the drainage channel 10 of each intermediate coal seam 230. Among them, multiple coal seams 200 are mined sequentially from top to bottom. For each coal seam 200, a working face needs to be arranged when mining the coal seam 200. Furthermore, for each intermediate coal seam 230, a construction drainage channel 10 is arranged in the intermediate coal seam 230 when arranging the working face.

[0038] The drainage pipe includes multiple drainage pipe sections, each corresponding to one of the multiple coal seams 200. Each drainage pipe section is located within its respective coal seam 200. When mining each intermediate coal seam 230, specifically for each intermediate coal seam 230, a predetermined length of pipe section is cut off from the bottom plate of the intermediate coal seam 230 upwards from the drainage pipe section within that intermediate coal seam 230. This ensures that the drainage channel 10 of the intermediate coal seam 230 is connected to the drainage channel 10 located in the lower layer of the intermediate coal seam 230. The upper end of the drainage pipe section in the coal seam 200 is connected, so that the water in the drainage channel 10 of the intermediate coal seam 230 can flow into the drainage pipe section of the lower coal seam 200, and then flow along the drainage pipe to the drainage channel 10 of the bottom coal seam 220, and then flow into the boundary drainage roadway 30 of the bottom coal seam 220; and the old working water in the roof of the intermediate coal seam 230 can also flow into the drainage pipe section of the intermediate coal seam 230, and flow through the lower end of the drainage pipe section to the drainage channel 10 of the intermediate coal seam 230.

[0039] It should be noted that since multiple coal seams 200 are mined sequentially from top to bottom, and the predetermined length of the pipe section is only cut off during the mining of the intermediate coal seam 230, the section of the drainage pipe below the currently mined intermediate coal seam 230 is continuous, enabling the water to be discharged into the drainage channel 10 of the bottom coal seam 220. The drainage pipe section of the upper coal seam 200 of the currently mined intermediate coal seam 230 has already undergone the predetermined length cut-off operation. Therefore, the old working water from the roof of the currently mined intermediate coal seam 230 can flow into the drainage pipe section through its upper port, and then flow from its lower port into the drainage channel 10 of the intermediate coal seam 230.

[0040] Because the upper end of the drainage pipe is connected to the drainage channel 10 of the top coal seam 210, water in the drainage channel 10 of the top coal seam 210 flows into the drainage pipe through the upper end of the drainage pipe, and then flows along the drainage pipe to the drainage channel 10 of the bottom coal seam 220, and then to the boundary drainage roadway 30 of the bottom coal seam 220. Water in the drainage channel 10 of the bottom coal seam 220 flows directly into the boundary drainage roadway 30.

[0041] Because it involves multi-seam mining, the mining of the top coal seam 210 is mainly affected by the aquifer water in its roof. The other coal seams 200, excluding the top coal seam 210, are mainly affected by water accumulation in the goaf during the mining of the upper coal resources (i.e., water hazards in the upper old goaf). The drainage system constructed using the method described in this application can achieve drainage for the working faces of each coal seam 200, achieving good water hazard prevention and ensuring the safe mining of coal resources. Furthermore, the construction method of this application only requires the construction of a boundary drainage roadway 30 in the bottom coal seam 220, eliminating the need to construct drainage roadways in every coal seam 200, thus reducing the amount of engineering work and solving the problem of large engineering workload in the existing drainage system construction methods used in multi-seam mining. By reducing the amount of engineering work involved in constructing the drainage system, water hazard prevention costs can also be reduced, and the labor intensity of workers can be decreased.

[0042] It should be noted that underground mines generally have varying degrees of water inflow. When the water inflow reaches a level that requires treatment before mining can begin, it is called a large water mine.

[0043] It should be noted that the bottom coal seam 220 refers to the bottom coal seam 200 among the multiple coal seams 200, and the top coal seam 210 refers to the top coal seam 200 among the multiple coal seams 200.

[0044] Specifically, the lower end of the drainage pipe extends to the drainage channel 10 of the bottom coal seam 220, so that the lower end of the drainage pipe is connected to the drainage channel 10 of the bottom coal seam 220. Furthermore, the lower end of the drainage pipe extends to the bottom plate of the bottom coal seam 220.

[0045] Specifically, the upper end of the drainage pipe extends to the drainage channel 10 of the top coal seam 210, so that the upper end of the drainage pipe is connected to the drainage channel 10 of the top coal seam 210. Furthermore, the upper end of the drainage pipe extends to the bottom plate of the top coal seam 210.

[0046] In this embodiment, a transport roadway 310, a return air roadway 320, and an opening cut 330 are constructed on the working face of each coal seam 200; the drainage channel 10 of each coal seam 200 is constructed on the working face of the coal seam 200; the drainage channel 10 of each coal seam 200 is connected to the transport roadway 310 of the coal seam 200 and to the opening cut 330 of the coal seam 200.

[0047] Specifically, the cut-out 330 on the working face of each coal seam 200 is connected to the return airway 320, and the cut-out 330 on the working face of each coal seam 200 is connected to the transport roadway 310; the drainage channel 10 on the working face of each coal seam 200 is connected at the intersection of the cut-out 330 and the transport roadway 310.

[0048] In this embodiment, before arranging the construction drainage well 20, the construction method further includes: arranging a water tank 31 connected to the boundary drainage tunnel 30 in the bottom coal seam 220, so that water in the boundary drainage tunnel 30 flows into the water tank 31.

[0049] In this embodiment, when constructing drainage channels 10 in each coal seam 200, the construction method further includes: erecting support members in the drainage channels 10 of each coal seam 200, and making the support members in each drainage channel 10 contact the top wall of the drainage channel 10 to support the top wall of the drainage channel 10, thereby preventing the drainage channel 10 from being crushed after the working face is mined out.

[0050] Specifically, for each support member, the support member includes a plurality of support parts spaced apart along the extension direction of the drainage channel 10, and each support part is in contact with the top wall of the drainage channel 10.

[0051] Optionally, the support is a timber stack 40.

[0052] In this embodiment, after cutting off a pre-set length of pipe segment from the drainage pipe segment in the intermediate coal seam 230, the construction method further includes: when there is no water accumulation in the upper old goaf area of ​​the intermediate coal seam 230, blocking the lower end of the drainage pipe segment in the intermediate coal seam 230 to prevent air leakage.

[0053] Specifically, methods for blocking the lower end of the drain pipe section include: using a baffle to block the lower end of the drain pipe section. Further, the baffle can be welded to the lower end of the drain pipe section.

[0054] In this embodiment, the preset length is 0.5m.

[0055] In this embodiment, the construction method of the drainage well 20 includes: drilling a hole downward in the drainage channel 10 of the top coal seam 210 using a raise boring machine, and drilling to the bottom plate of the bottom coal seam 220.

[0056] Specifically, the raise boring machine includes a series of sequentially set up... drill, Stabilize drill pipe, Drill pipe, Stabilize drill pipe, Drill pipe, Stabilize drill pipe, Drill pipe (top slag discharge).

[0057] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0058] In the construction method of the drainage system provided by the present invention, the construction method includes:

[0059] Construction boundary drainage roadways 30 are arranged at the mining area boundary of the bottom coal seam 220 of multiple coal seams 200, and a drainage channel 10 connected to the boundary drainage roadway 30 is arranged in the bottom coal seam 220; a construction drainage channel 10 is arranged in the top coal seam 210 of multiple coal seams 200.

[0060] Construction drainage wells 20 are arranged and extended along the distribution direction of multiple coal seams 200, penetrating each coal seam 200. The upper end of the drainage well 20 is located at the drainage channel 10 of the top coal seam 210, and the lower end of the drainage well 20 is located at the drainage channel 10 of the bottom coal seam 220. The multiple coal seams 200 are distributed sequentially from top to bottom.

[0061] Drainage pipes are arranged within the drainage well 20 along its extension direction, with both ends of the drainage pipes extending to the bottom coal seam 220 and the top coal seam 210, respectively. The upper end of the drainage pipe is connected to the drainage channel 10 of the top coal seam 210, and the lower end of the drainage pipe is connected to the drainage channel 10 of the bottom coal seam 220. Among the multiple coal seams 200, the coal seams 200 other than the top coal seam 210 and the bottom coal seam 220 are intermediate coal seams 230, that is, the multiple coal seams 200 include at least one intermediate coal seam 230. When working faces are arranged in each intermediate coal seam 230, construction drainage channels 10 are arranged in each intermediate coal seam 230, and the drainage well 20 is located at the drainage channel 10 of each intermediate coal seam 230. Among them, multiple coal seams 200 are mined sequentially from top to bottom. For each coal seam 200, a working face needs to be arranged when mining the coal seam 200. Furthermore, for each intermediate coal seam 230, a construction drainage channel 10 is arranged in the intermediate coal seam 230 when arranging the working face.

[0062] The drainage pipe includes multiple drainage pipe sections, each corresponding to one of the multiple coal seams 200. Each drainage pipe section is located within its respective coal seam 200. When mining each intermediate coal seam 230, specifically for each intermediate coal seam 230, a predetermined length of pipe section is cut off from the bottom plate of the intermediate coal seam 230 upwards from the drainage pipe section within that intermediate coal seam 230. This ensures that the drainage channel 10 of the intermediate coal seam 230 is connected to the drainage channel 10 located in the lower layer of the intermediate coal seam 230. The upper end of the drainage pipe section in the coal seam 200 is connected, so that the water in the drainage channel 10 of the intermediate coal seam 230 can flow into the drainage pipe section of the lower coal seam 200, and then flow along the drainage pipe to the drainage channel 10 of the bottom coal seam 220, and then flow into the boundary drainage roadway 30 of the bottom coal seam 220; and the old working water in the roof of the intermediate coal seam 230 can also flow into the drainage pipe section of the intermediate coal seam 230, and flow through the lower end of the drainage pipe section to the drainage channel 10 of the intermediate coal seam 230.

[0063] Because the upper end of the drainage pipe is connected to the drainage channel 10 of the top coal seam 210, water in the drainage channel 10 of the top coal seam 210 flows into the drainage pipe through the upper end of the drainage pipe, and then flows along the drainage pipe to the drainage channel 10 of the bottom coal seam 220, and then to the boundary drainage roadway 30 of the bottom coal seam 220. Water in the drainage channel 10 of the bottom coal seam 220 flows directly into the boundary drainage roadway 30.

[0064] The drainage system constructed using the method of this application can achieve the purpose of drainage for the working face of each coal seam 200, achieving a good water hazard prevention effect and ensuring the safe mining of coal resources. Moreover, the construction method of this application only requires the construction of the boundary drainage roadway 30 at the bottom coal seam 220, without the need to construct drainage roadways at each coal seam 200, reducing the amount of engineering construction and solving the problem of large engineering construction volume in the existing drainage system construction methods used in multi-coal seam mining.

[0065] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0066] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for constructing a drainage system, applied to the overhead mining face of a multi-coal-seam, high-water mine, characterized in that, The construction method includes: Construction boundary drainage roadways (30) are arranged at the mining area boundary of the bottom coal seam (220) of multiple coal seams (200), and drainage channels (10) connected to the boundary drainage roadways (30) are arranged in the bottom coal seam (220); construction drainage channels (10) are arranged in the top coal seam (210) of multiple coal seams (200); Arrange construction drainage wells (20), and make the drainage wells (20) extend along the distribution direction of the multiple coal seams (200) and penetrate each coal seam (200), so that the upper end of the drainage well (20) is located at the drainage channel (10) of the top coal seam (210), and the lower end of the drainage well (20) is located at the drainage channel (10) of the bottom coal seam (220); A drainage pipe is arranged in the drainage well (20) along the extension direction of the drainage well (20), and the two ends of the drainage pipe extend to the bottom coal seam (220) and the top coal seam (210) respectively, so that the upper end of the drainage pipe is connected to the drainage channel (10) of the top coal seam (210), and the lower end of the drainage pipe is connected to the drainage channel (10) of the bottom coal seam (220); Among the multiple coal seams (200), the coal seams (200) other than the top coal seam (210) and the bottom coal seam (220) are intermediate coal seams (230); when arranging working faces in each of the intermediate coal seams (230), construction drainage channels (10) are arranged in each of the intermediate coal seams (230), and the drainage wells (20) are located at the drainage channels (10) of each of the intermediate coal seams (230); The drainage pipe includes multiple drainage pipe sections, which are arranged one-to-one with multiple coal seams (200), and each drainage pipe section is located in the corresponding coal seam (200). When mining each intermediate coal seam (230), a pipe section of a predetermined length is cut off from the drainage pipe section in the intermediate coal seam (230) from the bottom plate of the coal seam upward.

2. The method for constructing a drainage system according to claim 1, characterized in that, Before arranging the construction drainage well (20), the construction method further includes: A water tank (31) connected to the boundary drainage tunnel (30) is constructed in the bottom coal seam (220).

3. The method for constructing a drainage system according to claim 1, characterized in that, When arranging construction drainage channels (10) in each of the coal seams (200), the construction method further includes: Support members are installed in the drainage channels (10) of each coal seam (200) and the support members are made to contact the top wall of the drainage channel (10) to support the top wall of the drainage channel (10).

4. The method for constructing a drainage system according to claim 3, characterized in that, The support includes a plurality of support portions spaced apart along the extension direction of the drainage channel (10), each of the support portions being in contact with the top wall of the drainage channel (10).

5. The method for constructing a drainage system according to claim 4, characterized in that, The support is a stack of timber (40).

6. The method for constructing a drainage system according to claim 1, characterized in that, After cutting off a predetermined length of pipe segment from the drainage pipe segment in the intermediate coal seam (230), the construction method further includes: When there is no water accumulation in the upper old goaf area of ​​the intermediate coal seam (230), the lower end of the drainage pipe section in the intermediate coal seam (230) is blocked.

7. The method for constructing a drainage system according to claim 6, characterized in that, Methods for blocking the lower end of the drainage pipe section include: The lower end of the drainage pipe section is blocked by a baffle.

8. The method for constructing a drainage system according to claim 7, characterized in that, The baffle is welded to the lower end of the drainage pipe section.

9. The method for constructing a drainage system according to claim 1, characterized in that, The preset length is 0.5m.

10. The method for constructing a drainage system according to claim 1, characterized in that, The construction method of the drainage well (20) includes: A reverse drilling rig is used to drill downwards into the drainage channel (10) of the top coal seam (210) and down to the bottom plate of the bottom coal seam (220).

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