Segmented construction method for open-off cut of working face of underground coal mine

Abstract

The invention relates to the technical field of underground coal mining, and particularly discloses an underground coal mine working face open-off cut segmented construction method which comprises the following steps: digging an equipment transportation channel between a transportation crossheading and an air return crossheading; an auxiliary transportation channel is dug between the transportation crossheading and the air return crossheading, the auxiliary transportation channel and the equipment transportation channel are arranged at intervals in the mining direction of the working face, solid coal pillars are formed between the auxiliary transportation channel and the equipment transportation channel, and the equipment transportation channel is arranged closer to the working face than the auxiliary transportation channel; the solid coal pillar is segmented in the direction from the transportation gate road to the air return gate road, and expanding excavation is conducted in sequence in the direction from the transportation gate road to the air return gate road; after each section of the solid coal pillar is excavated in an expanding mode, each section is supported through a hydraulic support. According to the method, the width of the open-off cut is reduced by reserving the coal pillars, the supporting problem of the ultra-large-width open-off cut is solved in a segmented expanding excavation installation and simplified supporting mode, and safe operation of workers is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of underground coal mining, and in particular to a segmented construction method for opening and cutting an eye on an underground coal mine working face. Background Art

[0002] In the related technologies, the main methods for arranging the openings and cuttings are: large-section one-time tunneling, small-section pilot tunneling and then secondary expansion tunneling. The support method is mainly a combined support body: top and side anchor net cable support + middle #-shaped wood pile or single hydraulic support lifting shed, top and side anchor net cable + top truss anchor cable + middle #-shaped wood pile or single hydraulic support lifting shed and other combined support methods. After the opening and cutting system is formed, the comprehensive mining equipment will be installed. When the supporting dimensions of the comprehensive mining equipment are large, the width of the opening and cutting will exceed the width of the ordinary opening and cutting, reaching about 10 meters. Under the condition of ultra-large width opening and cutting, it brings great risks and challenges to the management of the opening and cutting roof. In the related technologies, the combined support body structure cannot effectively transmit the load transmitted from the upper part of the tunnel roof, and there are safety hazards and risks such as bending and sinking of the roof and large-area roof collapse. To this end, it is of great significance to overcome the opening and cutting arrangement method to solve the problem of ultra-large width opening and cutting support, create conditions for the installation of the working face, and ensure the safety of employees. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention proposes a segmented construction method for opening and cutting a working face in an underground coal mine, which reserves an intermediate coal pillar between the equipment transportation channel and the auxiliary transportation channel to reduce the width of the opening and cutting, prevent large-area roof collapse, and apply the beam-column structure principle, segmented expansion and installation, and simplified support methods to solve the problem of supporting an opening and cutting of an ultra-large width, thereby ensuring the safety of workers.

[0004] The segmented construction method for opening a cut in an underground coal mine working face according to an embodiment of the present invention comprises:

[0005] Dig out the equipment transportation channel between the transport chute and the return air chute;

[0006] An auxiliary transport channel is excavated between the transport chute and the return air chute, the auxiliary transport channel and the equipment transport channel are arranged at intervals in the mining direction of the working face, a solid coal pillar is formed between the auxiliary transport channel and the equipment transport channel, and the equipment transport channel is arranged closer to the working face than the auxiliary transport channel;

[0007] The solid coal pillar is segmented in the direction from the transport chute to the return air chute, and is sequentially expanded along the direction from the transport chute to the return air chute;

[0008] After each section of the solid coal pillar is expanded, each section is supported by a hydraulic support.

[0009] The segmented construction method for opening and cutting of the working face of an underground coal mine in the embodiment of the present invention applies the principle of beam-column structure. The solid coal pillar separates the ultra-large width opening and cutting into double-channel opening and cutting, so as to reduce the span of the opening and cutting, increase the structural stability, simplify the combined support body, and provide technical support for the safe management of the opening and cutting roof; through segmented expansion and installation, the comprehensive mining hydraulic support can support the roof in time, reduce the retention time of large-area suspended roof, achieve the expected effect of ultra-large width opening and cutting roof management, and ensure safe production. It is of great significance; through the simplified support method, the solid coal pillar, the two vertical walls of the opening and cutting and the roof of the tunnel form a beam-column structure, which effectively transmits the load from the upper part of the roof of the tunnel, so as to simplify the complex combined support method of the opening and cutting in the past.

[0010] In some embodiments, before segmenting the solid coal pillar in the direction from the transport chute to the return air chute, the construction method further includes:

[0011] Laying a first track in the equipment transport channel, laying a second track on the upper portion toward the parking lot, and connecting the first track and the second track to form a track transport system;

[0012] A conveyor is installed in the auxiliary transport channel, and the conveyor is connected to a transfer machine in the transport chute to form a coal discharge system for discharging coal when the solid coal pillar is expanded.

[0013] In some embodiments, after each section of the solid coal pillar is expanded, each section is supported by a hydraulic support, including:

[0014] Expanding and excavating the solid coal pillar along the direction from the transport chute to the return air chute;

[0015] The roof of the expanded tunnel is supported by anchor net cables combined with top truss anchor cables;

[0016] While the solid coal pillar is being excavated in sections, the hydraulic supports are transported to installation positions in sequence according to the installation sequence of the hydraulic supports;

[0017] Repeat the segmented expansion and installation of hydraulic supports until the expansion of the reserved solid coal pillar and the installation of all hydraulic supports are completed.

[0018] In some embodiments, the step of transporting the hydraulic support to the installation location includes:

[0019] In the first position, the hydraulic support moves to the second position after passing the cross switch;

[0020] At the second position, the hydraulic support moves to the third position after being adjusted to the parking lot;

[0021] In the third position, the hydraulic support is moved to the fourth position after being pulled by the lifting winch;

[0022] At the fourth position, the hydraulic support is adjusted and moved to the fifth position by means of a special installation device;

[0023] In the fifth position, the hydraulic support is moved to the installation position after displacement adjustment.

[0024] In some embodiments, the solid coal pillar is segmented in the direction from the transport chute to the return air chute, and is sequentially excavated in the direction from the transport chute to the return air chute, including:

[0025] Marking the starting point and the ending point of each section of the solid coal pillar and numbering them in sequence;

[0026] When each section of the solid coal pillar is expanded, the displacement of the tunnel roof is monitored in real time, and when the displacement is greater than a preset value, the tunnel roof is supported.

[0027] In some embodiments, the length of the starting point and the ending point of each section of the expansion of the solid coal pillar in the direction from the transport chute to the return air chute is 5-7m; and / or,

[0028] Each section of the expanded excavation space of the solid coal pillar can accommodate 3-5 pairs of hydraulic supports.

[0029] In some embodiments, a conveyor is installed in the auxiliary transport channel, including:

[0030] When the working face is a full-height working face for one-time mining, a common 40-type coal chute is laid in the auxiliary transportation channel, and the pre-installed expanded common 40-type coal chute is withdrawn after the expansion is completed;

[0031] When the working face is a fully mechanized top coal caving working face, a rear scraper conveyor matching the working face is laid in the auxiliary transport channel and serves as a permanent scraper conveyor at the rear of the working face, which will not be withdrawn after the expansion is completed.

[0032] In some embodiments, the auxiliary transportation channel adopts trackless transportation or rail transportation.

[0033] In some embodiments, the construction method further comprises:

[0034] The equipment transport channel and the auxiliary transport channel are supported by anchor net cables and top truss anchor cables.

[0035] In some embodiments, the dimension of the equipment transport passage in the mining direction of the working face is 2.5-3.5 m; and / or,

[0036] The dimension of the auxiliary transport channel in the mining direction of the working face is 3.5-4.5 m; and / or,

[0037] The heights of the equipment transport channel and the auxiliary transport channel in the up and down directions are set to be the same and meet the requirements of 3.5-4.2m. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the double-channel eyelet opening arrangement of the segmented eyelet opening construction method for the underground coal mine working face in an embodiment of the present invention.

[0039] Figure 2 It is a schematic diagram of the segmented excavation and installation construction of the solid coal pillar in the segmented construction method for opening and cutting the working face of an underground coal mine according to an embodiment of the present invention.

[0040] Figure 3 It is a cross-sectional view of a double-channel eyelet opening arrangement of an eyelet opening segmented construction method for an underground coal mine working face in an embodiment of the present invention.

[0041] Reference numerals:

[0042] Transport chute 100, return air chute 200, lifting winch 300,

[0043] Equipment transport channel 1,

[0044] Auxiliary transport channel 2,

[0045] Solid coal pillar 3, first section 31, second section 32, nth section 33,

[0046] Hydraulic support 4,

[0047] Turn to parking lot 5,

[0048] Track transportation system 6, first track 61, second track 62,

[0049] First position 71 , second position 72 , third position 73 , fourth position 74 , fifth position 75 , installation position 76 . DETAILED DESCRIPTION

[0050] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0051] The present invention is more suitable for large-span eye opening construction, with a width of about 10 meters and a height of 3.5-4.2 meters. The auxiliary and transportation channels are straight-walled flat-top rectangular sections with a width of 3.0 meters and a height consistent with the height of the eye opening. The auxiliary transportation channel is used for auxiliary transportation of eye opening equipment installation in the early stage, and the front scraper conveyor and coal mining machine of the eye opening are installed in the channel in the later stage. The width is preferably 3.5-4.5 meters to meet the safety space for equipment transportation; the equipment transportation channel is used for the transportation of raw coal after the expansion of the eye opening solid coal pillar and the installation of the rear scraper conveyor. The width is preferably 3.0-3.5 meters to meet the installation space of the rear scraper conveyor; the width of the solid coal pillar is determined again according to the eye opening width B=b1+b2+b3 (where B is the eye opening width, b1 is the equipment transportation channel width, b2 is the solid coal pillar width, and b3 is the auxiliary transportation channel width).

[0052] The following is combined with Figures 1 to 3 The present invention describes a segmented construction method for opening a cut hole in an underground coal mine working face.

[0053] like Figures 1 to 3 As shown, the segmented construction method for opening a cut in an underground coal mine working face according to an embodiment of the present invention comprises:

[0054] An equipment transport channel 1 is excavated between the transport chute 100 and the return air chute 200 to serve as a transport path for the fully mechanized mining equipment, ensuring that the equipment can smoothly and safely reach its installation location.

[0055] An auxiliary transport channel 2 is excavated between the transport chute 100 and the return air chute 200 to serve as a transportation path for coal. The auxiliary transport channel 2 is also a transportation channel for auxiliary equipment. The auxiliary transport channel 2 and the equipment transport channel 1 are arranged at intervals in the mining direction of the working face. A solid coal pillar 3 is formed between the auxiliary transport channel 2 and the equipment transport channel 1. The equipment transport channel 1 is arranged closer to the working face than the auxiliary transport channel 2, so that the solid coal pillar 3, the two vertical walls of the cut eye and the roadway roof form a beam-column structure, which effectively transfers the load from the upper part of the roadway roof, which not only makes full use of the bearing capacity of the coal pillar and improves the overall stability of the working face, but also simplifies the previous complex joint support method of the cut eye.

[0056] The solid coal pillar 3 is segmented in the direction from the transport chute 100 to the return air chute 200 (eg Figure 2 As shown, the solid coal pillar 3 is divided into a first section 31, a second section 32 ... an nth section 33), and is excavated sequentially in the direction from the transport chute 100 to the return air chute 200. The length and number of the sections can be adjusted according to actual conditions and mining needs.

[0057] After each section of the solid coal pillar 3 is expanded, each section is supported by the hydraulic support 4. This step closely coordinates the expansion and equipment installation to ensure that the hydraulic support 4 supports the roof in time and reduces the retention time of a large area of ​​suspended roof.

[0058] The segmented construction method for opening and cutting of the working face of an underground coal mine in the embodiment of the present invention applies the principle of beam-column structure. The solid coal pillar 3 divides the ultra-large width opening and cutting into double-channel opening and cutting, so as to reduce the span of the opening and cutting, increase the structural stability, simplify the combined support body, and provide technical support for the safe management of the opening and cutting roof; through segmented expansion and installation, the comprehensive mining hydraulic support 4 can support the roof in time, reduce the retention time of large-area suspended roof, achieve the expected effect of ultra-large width opening and cutting roof management, and ensure safe production. It is of great significance; by reducing the support method, the solid coal pillar 3, the two vertical walls of the opening and cutting and the roof of the tunnel form a beam-column structure, which effectively transmits the load from the upper part of the tunnel roof, so as to simplify the complex combined support method of the opening and cutting in the past.

[0059] like Figure 1 and Figure 2 As shown, in some embodiments, before the solid coal pillar 3 is segmented in the direction from the transport chute 100 to the return air chute 200, the construction method further includes:

[0060] A first track 61 is laid in the equipment transport channel 1, and a second track 62 is laid in the upper part toward the parking lot 5. The first track 61 and the second track 62 are connected to form a track transport system 6 for transporting and installing working face comprehensive mining equipment, such as hydraulic supports 4 and coal mining machines.

[0061] A conveyor (such as a scraper conveyor or a common chute) is installed in the auxiliary transport channel 2, and the conveyor is connected to the transfer machine in the transport chute 100 to form a coal discharge system for discharging coal when the solid coal pillar 3 is expanded. The coal discharge system can be used as a temporary coal discharge system during the coal pillar expansion stage. On the one hand, it avoids the accumulation and retention of coal in the mine, which leads to a decrease in production efficiency and safety. On the other hand, by using the existing coal discharge system as a temporary coal discharge system, the cost of building additional temporary coal discharge facilities is avoided.

[0062] Therefore, the underground coal mine working face cutting segmented construction method of the embodiment of the present invention can quickly and safely transport equipment and coal through the setting of the rail transportation system 6 and the coal delivery system, thereby improving the efficiency and safety of comprehensive mining.

[0063] like Figure 2 As shown, in some embodiments, after each section of the solid coal pillar 3 is expanded, the step of supporting each section by the hydraulic support 4 includes:

[0064] The solid coal pillar 3 is expanded along the direction from the transport chute 100 to the return air chute 200 to ensure the orderly progress of the expansion work and avoid resource waste and safety hazards caused by disorderly expansion.

[0065] The roof of the tunnel after expansion is supported in time by anchor net cables combined with top truss anchor cables to enhance the bearing capacity of the tunnel and prevent the tunnel roof from collapsing or deforming due to excessive force. In addition, the stability of the tunnel roof and side walls is monitored during the expansion process. If there are any abnormal conditions, reinforcement measures should be taken immediately, such as adding support materials, adjusting support methods, etc., to ensure the safety and stability of the tunnel.

[0066] While the solid coal pillar 3 is being excavated in sections, the hydraulic supports 4 are transported to the installation positions in sequence according to their installation order, so that the equipment installation and excavation processes are closely coordinated, ensuring that the hydraulic supports 4 support the roof in a timely manner and reducing the retention time of a large area of ​​suspended roof.

[0067] Repeat the segmented excavation and installation of the hydraulic supports 4 until the excavation of the reserved solid coal pillar 3 and the installation of all the hydraulic supports 4 are completed.

[0068] like Figure 2 As shown, in some embodiments, the step of transporting the hydraulic support 4 to the installation location includes:

[0069] The initial position (first position 71) of the hydraulic support 4 is usually set in a temporary storage area in the return air chute 200. The hydraulic support 4 is moved so that the hydraulic support 4 moves to the second position 72 (usually adjusted to the inside of the chamber) after passing the cross switch.

[0070] At the second position 72 , the hydraulic support 4 is continued to be moved, so that the hydraulic support 4 is moved to the third position 73 (usually in the winch chamber) after being adjusted to the parking lot 5 , and the hydraulic support 4 is connected to the lifting winch 300 at the third position 73 .

[0071] At the third position 73 , the hydraulic support 4 is pulled from the third position 73 to a fourth position 74 by the lifting winch 300 . The fourth position 74 is usually close to the expanded section.

[0072] At the fourth position 74 , the hydraulic support 4 is precisely adjusted through special installation equipment according to the actual situation of the working surface and the installation requirements of the hydraulic support 4 , so that the hydraulic support 4 enters the expanded excavation section.

[0073] At the fifth position 75, the hydraulic support 4 is moved to the installation position 76 after the final shift adjustment to support the roof and reduce the retention time of a large area of ​​suspended roof.

[0074] In some embodiments, the steps of segmenting the solid coal pillar 3 in the direction from the transport chute 100 to the return air chute 200 and sequentially expanding the coal pillar 3 in the direction from the transport chute 100 to the return air chute 200 include:

[0075] The starting point and the ending point of each section of the expansion of the solid coal pillar 3 are marked and numbered in sequence to ensure the accuracy and continuity of the expansion.

[0076] When each section of the solid coal pillar 3 is expanded, the displacement of the tunnel roof is monitored in real time, and when the displacement is greater than the preset value, the tunnel roof is supported by top truss anchor cables to ensure the stability of the tunnel roof and side walls and prevent tunnel collapse or deformation.

[0077] In some embodiments, the length of the starting point and the ending point of each expansion of the solid coal pillar 3 in the direction from the transport chute 100 to the return air chute 200 is 5-7m; and / or, each expansion space of the solid coal pillar 3 can accommodate 3-5 pairs of hydraulic supports 4.

[0078] Optionally, the length of the starting point and the ending point of each section of the expansion of the solid coal pillar 3 in the direction from the transport chute 100 to the return air chute 200 is 5-7m. Since a too short expansion section may lead to poor support effect, and an overly long expansion section may increase mining difficulty and safety risks, by setting the starting point and the ending point of each section of the expansion of the solid coal pillar 3 in the direction from the transport chute 100 to the return air chute 200 to 5-7m, both mining efficiency and coal seam stability are considered.

[0079] Optionally, each expansion space of the solid coal pillar 3 can accommodate 3-5 pairs of hydraulic supports 4. The number of hydraulic supports 4 needs to be adjusted according to the size of the expansion section and the actual situation of the coal seam to ensure the stability and reliability of the support structure.

[0080] Optionally, the length of the starting point and the end point of each section of the expansion of the solid coal pillar 3 in the direction from the transport chute 100 to the return air chute 200 is 5-7m, and each section of the expansion space of the solid coal pillar 3 can accommodate 3-5 pairs of hydraulic supports 4. This setting ensures both the mining efficiency and the stability of the coal seam, and the stability and reliability of the support structure.

[0081] In some embodiments, a conveyor is installed in the auxiliary transport channel 2, including:

[0082] When the working face is a full-height working face for one-time mining, an ordinary 40-type coal chute is laid in the auxiliary transportation channel 2, and the ordinary 40-type coal chute installed in advance for expansion is withdrawn after the expansion is completed; when the working face is a full-height working face for one-time mining, due to the characteristics of the coal chute with simple structure, convenient maintenance and moderate transportation capacity, it is suitable for the coal transportation needs of the full-height working face for one-time mining. In the process of expanding the solid coal pillar 3, in order to transport coal in advance, an ordinary 40-type coal chute is usually laid in advance in the auxiliary transportation channel 2 to ensure that the coal can be transported in time and effectively during the expansion stage.

[0083] When the working face is a fully mechanized top coal caving working face, the rear scraper conveyor matching the working face is laid in the auxiliary transport channel 2 and used as a permanent scraper conveyor at the rear of the working face, and it will not be withdrawn after the expansion is completed. When the working face is a fully mechanized top coal caving working face, the scraper conveyor has the characteristics of strong transportation capacity, strong adaptability, stable operation, etc., which is suitable for the coal transportation needs of the fully mechanized top coal caving working face. The rear scraper conveyor matching the working face is laid in the auxiliary transport channel 2 as the main equipment for coal transportation and as a permanent scraper conveyor at the rear of the working face.

[0084] In some embodiments, the auxiliary transportation channel 2 adopts trackless transportation or rail transportation.

[0085] Trackless auxiliary transport vehicles are highly specialized, flexible, fast, and have a large one-time load capacity. They are widely used in transport tunnels with a slope of less than 8 degrees and a hard bottom plate. In conjunction with a shovel-type support transporter, they are mainly used to transport transfer trains and three-machine equipment in the comprehensive mining working face. In conjunction with a frame-type support transporter, they are mainly used to transport hydraulic supports 4 in the comprehensive mining working face.

[0086] The rail transport line is paved with narrow gauge rails. The inclined lanes are hoisted by winches, which are suitable for transport lanes with slopes greater than 8 degrees; the horizontal lanes are pulled by electric locomotives. The rail types are mainly 30kg / m and 43kg / m; the track gauges are mainly 600mm and 900mm; single turnouts, cross turnouts, and curved rails are laid at the line turning, turning, and crossing positions. The line is equipped with reinforced concrete sleepers and track laying accessories; the transport vehicles are mainly special bracket flatbed trucks and material flatbed trucks, which are mainly used to transport heavy equipment and equipment accessories.

[0087] In some embodiments, the construction method further comprises:

[0088] The equipment transport channel 1 and the auxiliary transport channel 2 are supported by anchor net cables and top truss anchor cables to ensure the stability and safety of the tunnels and prevent the tunnels from collapsing or deforming during the mining process.

[0089] In some embodiments, since too small a size may cause difficulty in equipment transportation, and too large a size may increase mining costs and safety risks, the size of the equipment transportation channel 1 in the mining direction of the working face is 2.5-3.5m to simultaneously meet the transportation needs of large mining equipment and tools and the stability and safety of the channel. And / or,

[0090] In order to provide sufficient space for the rapid transportation of auxiliary equipment and materials while maintaining the stability and safety of the passage, the dimension of the auxiliary transportation passage 2 in the mining direction of the working face is 3.5-4.5m. And / or,

[0091] In order to simplify construction and maintenance work, the heights of the equipment transport channel 1 and the auxiliary transport channel 2 in the vertical direction are set to the same, and in order to meet the transportation needs of equipment and materials and the safety and comfort of personnel in the channel, the heights of the equipment transport channel 1 and the auxiliary transport channel 2 in the vertical direction are set to 3.5-4.2m.

[0092] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0093] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0094] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0096] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0097] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A segmented construction method for opening and cutting holes in an underground coal mine working face. It is characterized in that include: Dig out the equipment transportation channel between the transport chute and the return air chute; An auxiliary transport channel is excavated between the transport chute and the return air chute, the auxiliary transport channel and the equipment transport channel are arranged at intervals in the mining direction of the working face, a solid coal pillar is formed between the auxiliary transport channel and the equipment transport channel, and the equipment transport channel is arranged closer to the working face than the auxiliary transport channel; The solid coal pillar is segmented in the direction from the transport chute to the return air chute, and is sequentially expanded along the direction from the transport chute to the return air chute; After each section of the solid coal pillar is expanded, each section is supported by a hydraulic support.

2. The segmented construction method for opening and cutting holes in an underground coal mine working face according to claim 1, It is characterized in that Before segmenting the solid coal pillar in the direction from the transport chute to the return air chute, the construction method further includes: Laying a first track in the equipment transport channel, laying a second track on the upper portion toward the parking lot, and connecting the first track and the second track to form a track transport system; A conveyor is installed in the auxiliary transport channel, and the conveyor is connected to a transfer machine in the transport chute to form a coal discharge system for discharging coal when the solid coal pillar is expanded.

3. The segmented construction method for opening and cutting holes in an underground coal mine working face according to claim 2, It is characterized in that After each section of the solid coal pillar is expanded, each section is supported by a hydraulic support, including: Expanding and excavating the solid coal pillar along the direction from the transport chute to the return air chute; The roof of the expanded tunnel is supported by anchor net cables combined with top truss anchor cables; While the solid coal pillar is being excavated in sections, the hydraulic supports are transported to installation positions in sequence according to the installation sequence of the hydraulic supports; Repeat the segmented expansion and installation of hydraulic supports until the expansion of the reserved solid coal pillar and the installation of all hydraulic supports are completed.

4. The segmented construction method for opening and cutting holes in an underground coal mine working face according to claim 3, It is characterized in that The steps of transporting the hydraulic support to the installation location include: In the first position, the hydraulic support moves to the second position after passing the cross switch; At the second position, the hydraulic support moves to the third position after being adjusted to the parking lot; In the third position, the hydraulic support is moved to the fourth position after being pulled by the lifting winch; At the fourth position, the hydraulic support is adjusted and moved to the fifth position by means of a special installation device; In the fifth position, the hydraulic support is moved to the installation position after displacement adjustment.

5. The segmented construction method for opening and cutting holes in an underground coal mine working face according to claim 3, It is characterized in that The solid coal pillar is segmented in the direction from the transport chute to the return air chute, and is sequentially excavated in the direction from the transport chute to the return air chute, including: Marking the starting point and the ending point of each section of the solid coal pillar and numbering them in sequence; When each section of the solid coal pillar is expanded, the displacement of the tunnel roof is monitored in real time, and when the displacement is greater than a preset value, the tunnel roof is supported.

6. The segmented construction method for opening and cutting holes in an underground coal mine working face according to claim 5, It is characterized in that The length of the starting point and the ending point of each section of the expansion of the solid coal pillar in the direction from the transport chute to the return air chute is 5-7m; and / or, Each section of the expanded excavation space of the solid coal pillar can accommodate 3-5 pairs of hydraulic supports.

7. The segmented construction method for opening and cutting holes in an underground coal mine working face according to claim 2, It is characterized in that Installing a conveyor in the auxiliary transport channel, including: When the working face is a full-height working face for one-time mining, a common 40-type coal chute is laid in the auxiliary transportation channel, and the pre-installed expanded common 40-type coal chute is withdrawn after the expansion is completed; When the working face is a fully mechanized top coal caving working face, a rear scraper conveyor matching the working face is laid in the auxiliary transport channel and serves as a permanent scraper conveyor at the rear of the working face, which will not be withdrawn after the expansion is completed.

8. The segmented construction method for opening and cutting holes in an underground coal mine working face according to claim 7, It is characterized in that The auxiliary transportation channel adopts trackless transportation or track transportation.

9. The segmented construction method for opening and cutting holes in an underground coal mine working face according to claim 7, It is characterized in that The construction method also includes: The equipment transport channel and the auxiliary transport channel are supported by anchor net cables and top truss anchor cables.

10. The method for segmented construction of opening eyelets in an underground coal mine working face according to claim 1, It is characterized in that The dimension of the equipment transport channel in the mining direction of the working face is 2.5-3.5 m; and / or, The dimension of the auxiliary transport channel in the mining direction of the working face is 3.5-4.5 m; and / or, The heights of the equipment transport channel and the auxiliary transport channel in the up and down directions are set to be the same and meet the requirements of 3.5-4.2m.

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