Extra-large section coal pillar crossheading roadway digging, filling, selecting and reserving integrated construction method

Abstract

The invention belongs to the technical field of coal mine roadway tunneling and filling. In order to solve the problem of mutual restriction of tunneling efficiency and filling efficiency in the prior art, the tunneling, filling, selecting and reserving integrated construction method for the oversized section coal pillar gate roadway comprises the steps that a roadway system is arranged, a protection coal pillar is formed between adjacent fully mechanized coal mining faces, a transportation gate roadway and an air return gate roadway are tunneled on the two sides of the protection coal pillar, and the tunneling efficiency and the filling efficiency are mutually restricted. An open-off cut connected roadway is excavated between two crossheads, tunneling complete equipment sequentially carries out transportation crossheading front tunneling and protection coal pillar side tunneling, then an air return crossheading is excavated, in-situ sorting is carried out on filling materials through an underground sorting system while roadway tunneling is carried out, a filling and sealing support is erected behind a tunneling head-on to seal a filling space, and the filling space is filled. And after the filling material reaches the solidification or form stripping strength, next cycle operation is carried out, meanwhile, the solid coal pillar on one side is reserved, the other side is supported by the solidified filling body, and gate roadway retaining is achieved. The construction method improves the resource recovery rate and the roadway tunneling efficiency of the fully mechanized coal mining face.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine roadway driving and filling, and particularly relates to an integrated construction method for roadway driving, filling, selection and retention of super-large cross-section coal pillar gateways. Background Art

[0002] In China, nearly 4 billion tons of coal are mined underground every year, but the phenomenon of resource waste is becoming increasingly serious. The resource recovery rate of coal mines in China is only 40%, and the resource recovery rate of mining areas is less than 85%. In the traditional "121" mining method, a 15-35m-wide protective coal pillar is usually left between adjacent sections, forming a mining mode of "gateway - coal pillar - gateway". During the advancement of the longwall face, the protective coal pillar is usually left unmined. On the one hand, it causes great waste of coal resources and directly leads to a reduction in the section resource recovery rate. On the other hand, from the roadway driving of the gateways on both sides of the coal pillar to the completion of the fully mechanized mining face mining, the roadway driving cycle is long, the driving speed is slow, and the bearing capacity of the coal pillar weakens after being affected by multiple dynamic pressures, resulting in a poor roadway protection effect. Summary of the Invention

[0003] In order to solve the above technical problems, the invention provides an integrated construction method for roadway driving, filling, selection and retention of super-large cross-section coal pillar gateways, which can improve the roadway forming efficiency and resource recovery rate on the gateway side.

[0004] The invention provides an integrated construction method for roadway driving, filling, selection and retention of super-large cross-section coal pillar gateways, which comprises the following steps: Arranging a roadway system, forming a protective coal pillar between adjacent fully mechanized mining faces, driving a transportation gateway and a return airway on both sides of the protective coal pillar respectively, arranging a cut-through roadway connecting the two gateways, arranging a complete set of driving equipment in the transportation gateway, and arranging an anchor support trolley in the return airway; Roadway driving: Using the complete set of driving equipment to successively drive the transportation gateway forward and the protective coal pillar side. The cutting part and the anchor support part of the complete set of driving equipment operate in parallel. After the complete set of driving equipment drives out the transportation gateway, it retreats to a designated position. By adjusting the angle between the fuselage of the complete set of driving equipment and the transportation gateway, the complete set of driving equipment repeats the operation of turning at an angle to drive the protective coal pillar until the space on the protective coal pillar side dug out can accommodate the complete set of driving equipment and the complete set of driving equipment is perpendicular to the axial direction of the transportation gateway. Then the complete set of driving equipment continues to drive towards the protective coal pillar side until the return airway is driven out. At the same time, the anchor support trolley completes the support operation in the return airway; While driving the roadway, the filling material is in-situ sorted by an underground sorting system. A filling sealing and fixing support is erected 20m behind the driving face to seal the filling space, and the sorted filling material is pumped to the filling working face through a filling pipeline. When the filling material reaches the setting or form removal strength, the next cycle operation is carried out. At the same time, one side of the solid coal pillar is reserved, and the other side is supported by the solidified filling body to realize gateway retention.

[0005] Optionally, the complete tunneling equipment includes a combined cutting, bolting and support unit, a combined bolting, hauling and breaking unit, a conveyor and a belt conveyor connected in sequence. The combined cutting, bolting and support unit tunnels and supports the roadway heading and transfers the coal to the combined bolting, hauling and breaking unit. The coal is crushed and buffered by the combined bolting, hauling and breaking unit and then transferred to the conveyor. The coal is transferred by the conveyor to the belt conveyor and transported out of the working face.

[0006] Optionally, the width of the transportation gateway is 5.0 m - 8.0 m, the height is 3.5 m - 6.0 m, the cutting and support cycle footage of the combined cutting, bolting and support unit is 1.0 m - 1.5 m, and the tunneling depth of the combined cutting, bolting and support unit is 1.5 - 2.0 times its body length.

[0007] Optionally, when the complete tunneling equipment conducts side tunneling of the protective coal pillar, adjust the crawler speed of the complete tunneling equipment to deflect its body towards the protective coal pillar. The angle between the body of the complete tunneling equipment and the axial direction of the transportation gateway is , the tail of the complete tunneling equipment deflects 45° towards the protective coal pillar, and the distance between the tail of the complete tunneling equipment and the coal rib on the side of the transportation gateway far from the protective coal pillar is 30 cm; The complete tunneling equipment tunnels along the angle After tunneling a certain distance, withdraw to the initial side tunneling position, adjust the crawler speed to deflect the body of the complete tunneling equipment until the distance between its tail and the coal rib on the side of the transportation gateway far from the protective coal pillar is 30 cm. The angle between the body of the complete tunneling equipment and the axial direction of the transportation gateway is ; The complete tunneling equipment tunnels along the angle After tunneling a certain distance, withdraw to the initial side tunneling position, adjust the crawler speed and repeat the above steps until a space for accommodating the complete tunneling equipment is dug out in the protective coal pillar. At this time, the complete tunneling equipment is at a 90° angle to the axial direction of the transportation gateway, and the complete tunneling equipment continues to tunnel until the transportation gateway is connected to the return air gateway.

[0008] Optionally, the filling material is a cemented filling material, and the filling material includes a mixture of gangue, fly ash, cement and water.

[0009] Optionally, the sum of the filling speed, the closing speed and the setting speed of the filling material is greater than the tunneling speed of the complete tunneling equipment.

[0010] Optionally, the underground sorting system includes an underground coal and gangue washing system, a ground gangue supply system, a ground pulp making system, and a filling mixing and pumping system; The underground coal gangue washing and separation system includes a main raw coal transportation system, an underground intelligent washing and separation system, a gangue material storage bin, and a heading face transportation system. The raw coal is transported to the underground intelligent washing and separation system through the main raw coal transportation system for washing and separation. The gangue washed out is stored in the gangue material storage bin. The heading face transportation system is used for transporting filling materials underground. The ground gangue supply system is used to transport the gangue in the gangue material storage bin to the filling mixing and pumping system. In the ground pulp preparation system, water, binder, additive, and fine aggregate are mixed to prepare the slurry. The filling mixing and pumping system includes a filling mixing system and an underground pumping system. The filling mixing system mixes the gangue and the slurry, and the mixed filling material is transported to the extra-large cross-section heading face through the underground pumping system.

[0011] Optionally, a roof contact sensor is provided in the filling and sealing support. The roof contact sensor is used to detect the distance from the top of the filling material to the bottom of the filling and sealing support. When the distance detected by the roof contact sensor is zero, the filling material achieves roof contact.

[0012] Optionally, an explosion-proof load-haul-dump vehicle is provided in the return air crossheading. The explosion-proof load-haul-dump vehicle is used to clean the floating coal in the cut-through roadway and the return air crossheading.

[0013] The technical solution provided by the embodiment of the present invention has the following beneficial effects compared with the prior art: The embodiment of the present invention provides an integrated construction method for roadway excavation, filling, separation, and retention of an extra-large cross-section coal pillar along the goaf. This construction method realizes the rapid excavation and retention of the gateways on both sides of the protected coal pillar, safely and efficiently recovers the protected coal pillar before the coal mining on both sides of the fully mechanized mining face, improves the resource recovery rate, realizes efficient mining through the integrated design of advancing mining, filling, and excavation, reduces ineffective transportation and energy consumption, reduces environmental pollution by filling with solid wastes such as coal gangue and fly ash, and can complete the excavation and support tasks of two roadways at one time, reduce the number of times of moving the equipment for roadway excavation, and improve the equipment operating rate.

[0014] While the tunneling complete equipment is tunneling the roadway, the filling work is carried out in parallel. After the coal pillar is recovered, the recovered space is immediately filled, leaving sufficient initial setting time for the filling body to avoid structural instability caused by premature disturbance, realizing the integration of tunneling, filling, and separation, solving the problem that the tunneling and filling efficiencies restrict each other in the prior art, proposing the in-situ filling process of gangue without hoisting to the surface, providing technical support and safety guarantee for improving the coal resource recovery rate. Description of the Drawings

[0015] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present invention, and are used together with the specification to explain the principles of the present invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the drivage and roadway formation of the super-large cross-section coal pillar gateway heading in the embodiment of the present invention; Figure 2 Schematic diagram of the cutting process of the combined roadway driving, bolting and support machine in the embodiment of the present invention; Figure 3 Schematic diagram of the underground sorting system in the embodiment of the present invention.

[0018] Among them, 1. The first fully mechanized mining face; 2. The return airway; 3. The filling material; 4. The conveyor gateway; 5. The second fully mechanized mining face; 6. The combined roadway driving, bolting and support machine; 7. The combined bolting, hauling and breaking machine; 8. The receiving section; 9. The bolting support trolley; 10. The transfer conveyor; 11. The filling pipeline; 12. The filling and sealing support; 13. The cut-through roadway; 14. The filling body; 15. The protective coal pillar; 16. The explosion-proof load-haul-dump vehicle. Detailed implementation manners

[0019] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the following will further describe the solutions of the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0021] Refer to Figure 1 As shown, this embodiment provides a method for integrated construction of excavation, filling, sorting and retention of super-large cross-section coal pillar gateways, which is applicable to geological conditions where the roof and floor of the coal seam are moderately stable or above, the coal and rock hardness is not higher than the Prandtl coefficient of 4, and the coal seam dip angle is not higher than 12°.

[0022] The roadway system is arranged, and a protective coal pillar 15 is formed between the adjacent first fully-mechanized coal mining face 1 and the second fully-mechanized coal mining face 5. The haulage gateway 4 and the return airway 2 are respectively driven on both sides of the protective coal pillar 15. The distance from the coal side of the haulage gateway 4 to the coal side of the return airway 2 is 20 m. Before the first fully-mechanized coal mining face 1 and the second fully-mechanized coal mining face 5 are mined, openings are made from one side of the district main roadway or the district up and down roadway, and the haulage gateway 4 and the return airway 2 are respectively driven. After driving to a certain distance, a cut-through roadway 13 is arranged between the haulage gateway 4 and the return airway 2 to form a "U"-type full-pressure ventilation system. An integrated tunneling equipment is arranged in the haulage gateway 4, and a bolt support jumbo 9 and an explosion-proof load-haul-dump vehicle 16 are arranged in the return airway 2.

[0023] The integrated tunneling equipment includes a combined cutting, bolting and roof support machine 6, a combined coal breaking, bolting and hauling machine 7, a conveyor 10 and a belt conveyor which are connected in sequence. The combined cutting, bolting and roof support machine 6 drives and supports along the roadway heading, loads and transfers the coal onto the combined coal breaking, bolting and hauling machine 7. The combined coal breaking, bolting and hauling machine 7 breaks, buffers and supports the coal with lagging bolts or cable bolts. The coal is transferred onto the conveyor 10 through the receiving section 8 at the tail of the combined coal breaking, bolting and hauling machine 7, and then is transferred onto the belt conveyor through the conveyor 10 and transported out of the working face.

[0024] For roadway driving, as shown in Figure 2 , the integrated tunneling equipment is used to drive the haulage gateway 4 forward and the side of the protective coal pillar 15 in sequence. Specifically, the body of the combined cutting, bolting and roof support machine 6 always remains parallel to the haulage gateway 4, and its cutting part and bolt support part operate in parallel. That is, the cutting part is advanced by the oil cylinder mechanism to cut and cut a groove, and at the same time, the bolt support part supports some bolts or cable bolts at different parts of the roof and side walls. After the combined cutting, bolting and roof support machine 6 drives forward a certain distance, the combined cutting, bolting and roof support machine 6 withdraws to a designated position, and the combined cutting, bolting and roof support machine 6 starts to drive the side of the protective coal pillar. By adjusting the crawler speed of the combined cutting, bolting and roof support machine 6, the body of the combined cutting, bolting and roof support machine 6 deflects towards the protective coal pillar 15. At the same time, the belt conveyor at the tail of the integrated tunneling equipment deflects 45° towards the protective coal pillar 15, and the distance between the tail of the integrated tunneling equipment and the coal side of the haulage gateway 4 away from the protective coal pillar 15 is 30 cm. At this time, the included angle between the body of the combined cutting, bolting and roof support machine 6 and the axial direction of the haulage gateway 4 is , and the combined cutting, bolting and roof support machine 6 drives along the included angle After driving a certain distance, it withdraws to the initial side-driving position, and continues to adjust the crawler speed of the combined cutting, bolting and roof support machine 6 to make the body of the combined cutting, bolting and roof support machine 6 deflect towards the protective coal pillar 15 until it stops when the distance between the tail of the integrated tunneling equipment and the coal side of the haulage gateway 4 away from the protective coal pillar 15 is 30 cm. At this time, the included angle between the body of the combined cutting, bolting and roof support machine 6 and the axial direction of the haulage gateway 4 is , and the angle of the included angle is greater than the included angle At an angle, the combined tunneling, bolting, and roadway support machine 6 advances along the included angle After tunneling a certain distance, it withdraws to the initial side tunneling position and repeats the above steps until the space on one side of the protective coal pillar 15 that has been excavated can accommodate the combined tunneling, bolting, and roadway support machine 6. At this time, the combined tunneling, bolting, and roadway support machine 6 forms a 90° angle with the axial direction of the transportation gateway 4. The combined tunneling, bolting, and roadway support machine 6 continues to tunnel towards the other side of the protective coal pillar 15 until the return airway 2 is excavated and the transportation gateway 4 is connected to the return airway 2.

[0025] During side tunneling, the combined tunneling, bolting, and roadway support machine 6 simultaneously performs bolting support operations. The bolting and cable bolting support in the return airway 2 are completed by the bolting support jumbo 9, and the explosion-proof load-haul-dump vehicle 16 is used to clean the floating coal in the crossheading connection roadway 13 and the return airway 2.

[0026] Among them, the width of the transportation gateway 4 is 5.0 m - 8.0 m, the height is 3.5 m - 6.0 m, the cutting and support cyclic advance of the combined tunneling, bolting, and roadway support machine 6 is 1.0 m - 1.5 m, the tunneling depth of the combined tunneling, bolting, and roadway support machine 6 is 1.5 - 2.0 times its fuselage length. The positions and quantities of the bolting rigs on the fuselages of the combined tunneling, bolting, and roadway support machine 6 and the combined tunneling, bolting, and coal breaking machine 7 can be flexibly arranged according to the support parameters and bolt distribution, and the support tasks are allocated in advance to ensure parallel operations of tunneling, support, and backfilling.

[0027] This construction method realizes the rapid excavation and retention of gateways on both sides of the protective coal pillar 15, safely and efficiently recovers the protective coal pillar 15 before the coal mining faces on both sides are mined, improves the resource recovery rate, realizes efficient mining through the integrated design of forward mining, excavation, and backfilling, reduces ineffective transportation and energy consumption, reduces environmental pollution by backfilling with solid wastes such as coal gangue and fly ash, and can complete the tunneling and support tasks of two roadways at one time, reduce the number of times of tunneling and relocating the face, and improve the operating rate of equipment.

[0028] While the roadway is being driven, the filling material 3 is sorted in-situ through an underground sorting system. The filling material 3 is a cemented filling material, which is a mixture of gangue, fly ash, cement and water. A filling and sealing support 12 is erected 20 m behind the driving face to enclose the filling space, and the sorted filling material 3 is pumped to the filling working face through a filling pipeline 11. Moreover, the sum of the filling speed, sealing speed and solidification speed of the filling material 3 is greater than the driving speed of the complete driving equipment, so as to realize parallel operation, such that the subsequent processes do not affect the driving progress. To ensure that the filling material 3 can completely reach the roof, a roof contact sensor is provided in the filling and sealing support 12. The roof contact sensor is used to detect the distance from the top of the filling material 3 to the bottom of the filling and sealing support 12. When the detected distance by the roof contact sensor is zero, the filling material 3 reaches the roof. When the filling material 3 reaches the solidification or form removal strength, the next cycle of operation is carried out. The filling and sealing support 12 is moved forward into the next filling working face to continue the filling operation. Meanwhile, a solid coal pillar is reserved on one side, and the other side is supported by the solidified filling body 14, realizing the retention of the crossheading roadway.

[0029] Among them, referring to Figure 3As shown in the figure, the underground separation system includes an underground coal-gangue washing system, a ground gangue supply system, a ground slurry preparation system, and a filling mixing and pumping system. The underground coal-gangue washing system includes a main raw coal transportation system, an underground intelligent washing system, a gangue material storage bin, and a tunneling face transportation system. The tunneling face transportation system transports the filling material 3 on the extra-large cross-section tunneling face to the main raw coal transportation system. The raw coal is transported to the underground intelligent washing system through the main transportation system underground, such as a belt conveyor or a mine car. The underground intelligent washing system efficiently washes the raw coal to remove gangue and other impurities in the raw coal, thereby improving the quality of coal. The gangue generated during the washing process is transported to the gangue material storage bin for storage. The ground gangue supply system lifts the underground gangue to the ground through a lifting device, and then transports the gangue to the filling mixing system through a transportation device. Before being supplied to the filling mixing system, the gangue needs to undergo pretreatment steps such as crushing and screening to meet the requirements of the filling operation. In the ground slurry preparation system, the water supply system provides clean water, cement and other cementitious materials are used to enhance the strength of the slurry, additives are used to improve the fluidity of the slurry, and fly ash and other fine aggregates are used to fill voids and reduce costs. Water, cementitious materials, additives, and fine aggregates are mixed and stirred to prepare a slurry that meets the requirements. The filling mixing system and the pumping system include a filling mixing system and an underground pumping system. The filling mixing system fully stirs and mixes the gangue with the slurry prepared by the ground slurry preparation system to form a uniform filling material 3. The mixed filling material 3 is transported to the extra-large cross-section tunneling face through the underground pumping system. At the extra-large cross-section tunneling face, the filling material 3 is used to fill the goaf or support the roadway to improve the safety and stability of the mine. Through the coordinated work of each system in the whole process, the efficient washing of underground coal and gangue, the ground supply of gangue, the preparation of high-quality slurry, and the underground pumping of the filling material 3 are realized. This process not only improves the utilization rate of coal resources, but also reduces the environmental pollution caused by gangue, and has significant economic and environmental benefits.

[0030] While the tunneling complete equipment is tunneling the roadway, the filling work is carried out in parallel. After the coal pillar is recovered, the recovered space is immediately filled, leaving sufficient initial setting time for the filling body 14 to avoid structural instability caused by premature disturbance. It realizes the integration of tunneling, filling, and separation, solves the problem that the tunneling and filling efficiencies restrict each other in the existing technology, and proposes an in-situ filling process for gangue without lifting it to the surface, providing technical support and safety guarantee for improving the recovery rate of coal resources.

[0031] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0032] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments described herein, but rather will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated construction method for roadway excavation, filling, selection, and retention of super-large cross-section coal pillars, characterized in that, The method includes the following steps: Arrange a roadway system, form a protective coal pillar (15) between adjacent fully mechanized mining faces, drive a haulage gateway (4) and a return airway (2) respectively on both sides of the protective coal pillar (15), arrange a cut-through roadway (13) between the haulage gateway (4) and the return airway (2), and arrange a complete tunneling equipment in the haulage gateway (4) and an anchor support jumbo (9) in the return airway (2); Tunnel the roadway. Use the complete tunneling equipment to successively drive ahead the haulage gateway (4) and side-drive the protective coal pillar (15). The cutting part and the anchor support part of the complete tunneling equipment operate in parallel. After the complete tunneling equipment excavates the haulage gateway (4), it withdraws to a designated position. By adjusting the angle between the body of the complete tunneling equipment and the haulage gateway (4), repeat the operation of turning at the corner to drive the protective coal pillar (15) until the side space of the excavated protective coal pillar (15) can accommodate the complete tunneling equipment and the axial direction of the complete tunneling equipment is perpendicular to that of the haulage gateway (4). Then the complete tunneling equipment continues to drive towards the side of the protective coal pillar (15) until the return airway (2) is excavated. At the same time, the anchor support jumbo (9) completes the support operation in the return airway (2); While tunneling the roadway, in-situ separation of the filling material (3) is carried out through an underground separation system. A filling and sealing support (12) is erected 20 m behind the tunneling face to seal the filling space, and the separated filling material (3) is pumped to the filling working face through a filling pipeline (11). When the filling material (3) reaches the setting or formwork removal strength, the next cycle of operation is carried out. At the same time, one side of the solid coal pillar is reserved, and the other side is supported by the solidified filling body (14) to realize the retention of the gateway roadway; 2. The integrated construction method for roadway excavation, filling, selection, and retention of an extra-large cross-section coal pillar gate road according to claim 1, characterized in that The complete tunneling equipment includes a combined cutting, bolting and support unit (6), a combined bolting, hauling and breaking unit (7), a belt conveyor (10) and a belt conveyor connected in sequence. The combined cutting, bolting and support unit (6) tunnels and supports along the tunneling face and transfers the coal to the combined bolting, hauling and breaking unit (7). The coal is crushed and buffered by the combined bolting, hauling and breaking unit (7) and then transferred to the belt conveyor (10). The coal is transferred to the belt conveyor by the belt conveyor (10) and transported out of the working face; 3. The integrated construction method for roadway excavation, filling, selection, and retention of an extra-large cross-section coal pillar gate road according to claim 2, characterized in that The width of the haulage gateway (4) is 5.0 m - 8.0 m, and the height is 3.5 m - 6.0 m. The cutting and support cycle footage of the combined cutting, bolting and support unit (6) is 1.0 m - 1.5 m, and the tunneling depth of the combined cutting, bolting and support unit (6) is 1.5 - 2.0 times its body length; 4. The integrated construction method for roadway excavation, filling, selection and retention of super-large cross-section coal pillars according to claim 1, characterized in that, When the full tunneling equipment is tunneling on the side of the protective coal pillar (15), adjust the crawler speed of the full tunneling equipment to deflect its fuselage towards the protective coal pillar (15). The included angle between the fuselage of the full tunneling equipment and the axial direction of the transport gateway (4) is , the tail of the full tunneling equipment deflects 45° towards the protective coal pillar (15), and the distance between the tail of the full tunneling equipment and the coal wall on the side of the transport gateway (4) away from the protective coal pillar (15) is 30 cm; Boring complete equipment along the included angle After boring a certain distance, withdraw to the initial side-boring position, adjust the crawler speed to deflect the fuselage of the boring complete equipment until the distance between its tail and the coal wall on the side of the transportation gateway (4) away from the protective coal pillar (15) is 30 cm. The included angle between the fuselage of the boring complete equipment and the axial direction of the transportation gateway (4) is ; The tunneling complete equipment along the included angle After tunneling a certain distance, withdraw to the initial side tunneling position, adjust the crawler speed and repeat the above steps until a space for accommodating the tunneling complete equipment is excavated in the protective coal pillar (15). At this time, the tunneling complete equipment forms a 90° angle with the axial direction of the transportation gateway (4), and the tunneling complete equipment continues to tunnel until the transportation gateway (4) is connected with the return air gateway (2).

5. A method for integrated construction of roadway excavation, filling, selection and retention of super-large cross-section coal pillars according to claim 1, characterized in that, The filling material (3) is a cemented filling material, and the filling material (3) includes a mixture of gangue, fly ash, cement and water; 6. The integrated construction method for roadway excavation, filling, selection and retention of an extra-large cross-section coal pillar gateway according to claim 1, characterized in that The sum of the filling speed, sealing speed and setting speed of the filling material (3) is greater than the tunneling speed of the complete tunneling equipment, achieving the purpose of parallel operation of tunneling, filling and setting; 7. The integrated construction method for roadway excavation, filling, selection and retention of super-large cross-section coal pillars according to claim 1, characterized in that, The underground separation system includes an underground coal and gangue washing system, a ground gangue supply system, a ground pulp preparation system and a filling mixing and pumping system; The underground coal gangue washing and separation system includes a main raw coal transportation system, an underground intelligent washing and separation system, a gangue material storage bin, and a heading face transportation system. The raw coal is transported to the underground intelligent washing and separation system through the main raw coal transportation system for washing and separation. The washed gangue is stored in the gangue material storage bin. The heading face transportation system is used to transport filling materials (3) underground; The ground gangue supply system is used to transport the gangue in the gangue material storage bin to the filling mixing and pumping system; In the ground pulp preparation system, water, binder, additives, and fine aggregate are mixed to prepare a slurry; The filling mixing and pumping system includes a filling mixing system and an underground pumping system. The filling mixing system mixes the gangue with the slurry, and the mixed filling material (3) is transported to the ultra-large cross-section heading face through the underground pumping system.

8. The integrated construction method for roadway excavation, filling, selection and retention of super-large cross-section coal pillars according to claim 1, characterized in that, A roof contact sensor is provided in the filling and sealing support (12). The roof contact sensor is used to detect the distance from the top of the filling material (3) to the bottom of the filling and sealing support (12). When the distance detected by the roof contact sensor is zero, the filling material (3) achieves roof contact.

9. The integrated construction method for roadway excavation, filling, selection and retention of super-large cross-section coal pillars according to claim 1, characterized in that, An explosion-proof load-haul-dump vehicle (16) is provided in the return air heading (2). The explosion-proof load-haul-dump vehicle (16) is used to clean the floating coal in the cut-through roadway (13) and the return air heading (2).

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