Method for building end - slope bridge in thick - coal - seam open - pit mine

Abstract

The present invention provides a method for constructing an end-bench bridge in an open-pit mine with thick coal seams. The method for constructing an end-bench bridge in an open-pit mine with thick coal seams includes: at a preset tracking distance from the slope bottom of the waste-dumping bench of the waste-dump yard, pushing the coal roof bench, the stripping benches and the coal-mining benches of multiple coal seams within a preset length and a preset width on the side of the working bench close to the end-bench in the direction away from the waste-dump yard; constructing multiple coal-seam bridge bodies on the slope adjacent to the end-bench to connect the waste-dumping bench and the coal-mining benches of multiple coal seams, and constructing a coal-floor bridge body on the slope adjacent to the coal-seam bridge bodies to connect the waste-dumping bench and the coal floor. Through the technical solution provided by this application, the problem that the passing volume of trucks on the lower end-bench bridge in the related art is large, reducing the production efficiency, can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine mining, and in particular, to a method for building an end-bench bridge in an open-pit mine with thick coal seams. Background Art

[0002] Open-pit mine mining requires stripping the overburden above the coal seam to expose the coal seam. During the mining process, it is necessary to separate the overburden from the coal and transport the overburden to the waste dump. Among them, the waste dump is divided into an internal waste dump and an external waste dump.

[0003] In the related art, the overburden is discharged to the waste dump through the end-bench transportation road. The method for building the end-bench transportation road is to build an end-bench bridge from the coal seam roof to the internal waste dump. The mobile pit line is arranged for each horizontal stratified coal seam, and it is gradually lifted to the coal seam roof and enters the waste dump through the end-bench bridge. Among them, the bench overburden of at least two working benches corresponds to one bench of the waste dump, and the overburden of the lower bench and the mined coal need to be lifted to the nearest end-bench transportation channel.

[0004] However, when using the method for building the end-bench bridge in the related art, the passing volume of trucks on the lower end-bench bridge is large, and the stripping trucks and coal-hauling trucks run crosswise. If a truck breaks down during passing, it will cause a temporary paralysis of the transportation system and reduce the production efficiency. Summary of the Invention

[0005] The present invention provides a method for building an end-bench bridge in an open-pit mine with thick coal seams to solve the problem of reduced production efficiency due to the large passing volume of trucks on the lower end-bench bridge in the related art.

[0006] The present invention provides a method for building an end-bench bridge in an open-pit mine with thick coal seams. The method for building an end-bench bridge in an open-pit mine with thick coal seams includes: pushing the coal roof bench, the stripping benches and the coal mining benches of multiple coal seams within a preset length and a preset width on the side of the working bench close to the end-bench in the direction away from the waste dump at a preset tracking distance from the slope bottom of the waste dump bench of the waste dump; building multiple coal seam bridges connecting the waste dump bench and the coal mining benches of multiple coal seams on the slope attached to the end-bench, and building a coal floor bridge connecting the waste dump bench and the coal floor on the slope attached to the coal seam bridge.

[0007] Furthermore, the multiple coal seams include a first coal seam, a second coal seam, and a third coal seam arranged in sequence from top to bottom. Multiple coal seam bridges connecting the waste dump bench and the coal mining benches of the multiple coal seams are built on the slope adjacent to the end slope. The steps of building a coal floor bridge connecting the waste dump bench and the coal floor on the slope adjacent to the coal seam bridges include: building a first bridge between the waste dump bench and the coal mining bench of the first coal seam and on the slope adjacent to the end slope, connecting the two ends of the first bridge to the top surface of the first coal seam and the waste dump bench; building a second bridge between the waste dump bench and the coal mining bench of the second coal seam and on the slope adjacent to the first bridge, connecting the two ends of the second bridge to the second coal seam and the top surface of the waste dump bench respectively; building a third bridge between the waste dump bench and the coal mining bench of the third coal seam and on the slope adjacent to the second bridge, connecting the two ends of the third bridge to the third coal seam and the top surface of the waste dump bench respectively, so as to form multiple coal seam bridges; building a coal floor bridge between the waste dump bench and the coal floor and on the slope adjacent to the third bridge, connecting one end of the coal floor bridge to the top surface of the waste dump bench.

[0008] Furthermore, the steps of pushing the coal roof bench, the stripping benches, and the coal mining benches of the multiple coal seams within a preset length and a preset width on the side of the working bench close to the end slope away from the waste dump at a preset tracking distance from the bottom of the slope of the waste dump bench of the waste dump yard include: the preset width is calculated by adding the width of the first bridge, the width of the second bridge, the width of the third bridge, the width of the coal floor bridge, the width of the slope of the coal floor bridge, the width of the transportation channel of the coal floor, and a preset coefficient.

[0009] Furthermore, the steps of pushing the coal roof bench, the stripping benches, and the coal mining benches of the multiple coal seams within a preset length and a preset width on the side of the working bench close to the end slope away from the waste dump at a preset tracking distance from the bottom of the slope of the waste dump bench of the waste dump yard include: the preset length is calculated by adding the projected length of the coal floor bridge on the coal floor and the width of the transportation channel of the coal floor; the projected length of the coal floor bridge on the coal floor is calculated from the height difference between the coal floor and the waste dump bench and the slope of the coal floor bridge.

[0010] Further, a first bridge body is constructed on the slope of the waste-dumping bench that abuts against the end slope and is adjacent to the coal-mining bench of the first coal seam, with both ends of the first bridge body connected to the top surface of the first coal seam and the waste-dumping bench. A second bridge body is constructed on the slope of the waste-dumping bench that abuts against the first bridge body and is adjacent to the coal-mining bench of the second coal seam, with both ends of the second bridge body respectively connected to the second coal seam and the top surface of the waste-dumping bench. A third bridge body is constructed on the slope of the waste-dumping bench that abuts against the second bridge body and is adjacent to the coal-mining bench of the third coal seam, with both ends of the third bridge body respectively connected to the third coal seam and the top surface of the waste-dumping bench. The steps of forming multiple coal-seam bridge bodies include: transporting the first overburden to the first coal seam, dumping the first overburden along the slope of the end slope, and leveling the first overburden to form the first bridge body; transporting the second overburden to the second coal seam, dumping the second overburden along the slope of the first bridge body, and leveling the second overburden to form the second bridge body; transporting the third overburden to the third coal seam, dumping the third overburden along the slope of the second bridge body, and leveling the third overburden to form the third bridge body; transporting the fourth overburden to the coal floor, dumping the fourth overburden along the slope of the third bridge body, and leveling the fourth overburden to form the coal-floor bridge body.

[0011] Further, the steps of transporting the first overburden to the first coal seam, dumping the first overburden along the slope of the end slope, and leveling the first overburden to form the first bridge body include: dumping the first overburden from the working bench towards the waste-dumping yard.

[0012] Further, before the steps of constructing multiple coal-seam bridge bodies that connect the waste-dumping bench and the coal-mining benches of multiple coal seams on the slope that abuts against the end slope, and constructing a coal-floor bridge body that connects the waste-dumping bench and the coal floor on the slope of the coal-seam bridge body, it includes: laying gangue on the coal-mining benches of each coal seam.

[0013] Further, before the steps of pushing the coal roof bench, the overburden benches, and the coal-mining benches of multiple coal seams within a preset length and width on the side of the working bench close to the end slope in the direction away from the waste-dumping yard at a preset tracking distance from the bottom of the slope of the waste-dumping bench of the waste-dumping yard, it includes: determining the widths of each coal-seam bridge body, the coal-floor bridge body, the transportation passage of the coal floor, and the projected width of the slope of the coal-floor bridge body on the coal floor.

[0014] Further, after the steps of constructing multiple coal-seam bridge bodies that connect the waste-dumping bench and the coal-mining benches of multiple coal seams on the slope that abuts against the end slope, and constructing a coal-floor bridge body that connects the waste-dumping bench and the coal floor on the slope of the coal-seam bridge body, the method for constructing the end slope bridge of the thick coal-seam open-pit mine further includes: demolishing the multiple coal-seam bridge bodies.

[0015] Further, the steps of demolishing multiple coal seam bridges include: excavating the first overburden from the working slope to the waste dump until the distance between the projection of the excavation position on the coal floor and the working slope is the width of the transportation passage of the coal floor, enabling vehicle passage between the first bridge and the second bridge, transporting the first overburden to the waste dump, and leveling the first overburden; excavating the first overburden and the second overburden from the working slope to the waste dump until the distance between the projection of the excavation position on the coal floor and the working slope is the width of the transportation passage of the coal floor, enabling vehicle passage between the first bridge, the second bridge and the third bridge, transporting the first overburden and the second overburden to the waste dump, and leveling the first overburden and the second overburden; excavating the first overburden, the second overburden and the third overburden from the working slope to the waste dump until the distance between the projection of the excavation position on the coal floor and the working slope is the width of the transportation passage of the coal floor, and transporting the first overburden, the second overburden and the third overburden to the waste dump, and leveling the first overburden, the second overburden and the third overburden.

[0016] Applying the technical solution of the present invention, by pushing the coal roof bench, the stripping benches and the coal mining benches within the preset length and preset width on one side of the working slope close to the end slope at a preset tracking distance from the bottom of the slope of the waste dump step in the direction away from the waste dump in advance, the coal seams and rock strata in this area can be cleared, thereby providing space for the construction of the end slope bridge, and there is no need to demolish the bridges in this area subsequently, reducing the workload and improving the work efficiency. Furthermore, multiple coal seam bridges connecting the waste dump step and the coal mining benches of multiple coal seams can be built on the slope adjacent to the end slope, and a coal floor bridge connecting the waste dump step and the coal floor can be built on the slope adjacent to the coal seam bridge. Thus, the overburden of the corresponding coal seam can be transported to the waste dump step for disposal by using multiple coal seam bridges, and the coal blocks of the corresponding coal seam can be transported to the corresponding crushing station through the coal seam bridges and the waste dump step. The coal floor bridge can be used to transport the overburden of the lowermost coal seam to the waste dump step for disposal, and the coal blocks of the lowermost coal seam can be transported to the corresponding crushing station through the coal seam bridges and the waste dump step. Since the coal blocks and overburden of different coal seams are transported by different end slope bridges, compared with the end slope bridges in the related art, the trucks will not gather, and the throughput is small, improving the production efficiency. Description of the Drawings

[0017] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 Shows a flowchart of a method for building an end slope bridge in a thick coal seam open-pit mine according to an embodiment of the present invention;

[0019] Figure 2Shows a schematic structural diagram of the working bench moving away from the waste dump according to an embodiment of the present invention;

[0020] Figure 3 Shows a schematic structural diagram of the construction of the first bridge body according to an embodiment of the present invention;

[0021] Figure 4 Shows a schematic structural diagram of the construction of the second bridge body according to an embodiment of the present invention;

[0022] Figure 5 Shows a schematic structural diagram of the construction of the third bridge body according to an embodiment of the present invention;

[0023] Figure 6 Shows a schematic structural diagram of the construction of the coal floor bridge body according to an embodiment of the present invention;

[0024] Figure 7 Shows Figure 6 A partial enlarged view of the Z in;

[0025] Figure 8 Shows a schematic structural diagram of the removal of the coal seam bridge body according to an embodiment of the present invention.

[0026] Among them, the above-mentioned drawings include the following reference numerals:

[0027] 10. Waste dump;

[0028] 20. Working bench; 21. First coal seam; 22. Second coal seam; 23. Third coal seam;

[0029] 30. End bench;

[0030] 40. Coal seam bridge body; 41. First bridge body; 42. Second bridge body; 43. Third bridge body; 44. Coal floor bridge body;

[0031] A. Preset tracking distance; B. Preset length; C. Preset width; D. Width of the first bridge body; E. Width of the second bridge body; F. Width of the third bridge body; G. Width of the coal floor bridge body; H. Width of the slope of the coal floor bridge body; L. Width of the transportation channel of the coal floor. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] As Figures 1 to 7 shown, the embodiment of the present invention provides a method for building an end-bench bridge in a thick coal seam open-pit mine. The method for building an end-bench bridge in a thick coal seam open-pit mine includes:

[0034] S200. At a preset tracking distance A at the bottom of the slope of the dumping bench 10 away from the dump site, push the coal roof bench, the stripping benches and the coal mining benches of multiple coal seams within a preset length B and a preset width C on the side of the working bench 20 close to the end bench 30 in the direction away from the dump site 10;

[0035] S400. Build multiple coal seam bridges 40 connecting the dumping bench and the coal mining benches of multiple coal seams on the slope close to the end bench 30, and build a coal floor bridge 44 connecting the dumping bench and the coal floor on the slope close to the coal seam bridge 40.

[0036] Applying the technical solution of the present invention, by pre-pushing the coal roof bench, the stripping benches and the coal mining benches of multiple coal seams within a preset length and a preset width on the side of the working bench 20 close to the end bench 30 at a preset tracking distance at the bottom of the slope of the dumping bench 10 away from the dump site, the coal seams and rock strata in this area can be cleared, thereby providing space for the construction of the end-bench bridge, and there is no need to demolish the bridges in this area subsequently, reducing the workload and improving the work efficiency. Furthermore, multiple coal seam bridges 40 connecting the dumping bench and the coal mining benches of multiple coal seams can be built on the slope close to the end bench 30, and a coal floor bridge 44 connecting the dumping bench and the coal floor can be built on the slope close to the coal seam bridge 40. Thus, the stripping materials of the corresponding coal seams can be transported to the dumping bench for disposal by using the multiple coal seam bridges 40, and the coal blocks of the corresponding coal seams can be transported to the corresponding crushing stations through the coal seam bridges 40 and the dumping bench. The coal floor bridge 44 can be used to transport the stripping materials of the lowermost coal seam to the dumping bench for disposal, and the coal blocks of the lowermost coal seam can be transported to the corresponding crushing stations through the coal seam bridges 40 and the dumping bench. Since the coal blocks and stripping materials of different coal seams are transported by different end-bench bridges, compared with the trucks of the end-bench bridges in the related art, they will not gather, and the throughput is small, thus improving the production efficiency.

[0037] Among them, in step S200, in order to reduce the subsequent workload, at a preset tracking distance A at the slope bottom of the dumping bench 10 away from the dump site, the coal roof bench, the stripping benches and the coal mining benches within a preset length B and a preset width C on the side of the working bench 20 close to the end bench 30 are pushed along the direction away from the dump site 10, which can provide space for the construction of the end bench bridge, and since the coal seams and rock strata in this area are cleared, there is no need to demolish the bridge body in this area subsequently.

[0038] In this embodiment, in step S400, by building a plurality of coal seam bridges 40 connecting the dumping bench and the coal mining benches of multiple coal seams on the slope against the end bench 30, and building a coal floor bridge 44 connecting the dumping bench and the coal floor on the slope against the coal seam bridge 40, the overburden of the corresponding coal seam can be transported to the dumping bench for dumping through the plurality of coal seam bridges 40 and the coal floor bridge 44, and the coal blocks of the corresponding coal seam can be transported to the corresponding crushing station through the coal seam bridges 40 and the dumping bench.

[0039] It should be noted that in step S400, during the process of pushing the coal roof bench and the stripping benches and the coal mining benches of multiple coal seams along the direction away from the dump site 10, the coal roof bench and the stripping benches and the coal mining benches of multiple coal seams all need to maintain a certain bench width and be pushed along the direction away from the dump site 10.

[0040] As Figures 3 to 7 shown, the multiple coal seams include a first coal seam 21, a second coal seam 22 and a third coal seam 23 arranged in sequence from top to bottom. The step S400 of building a plurality of coal seam bridges 40 connecting the dumping bench and the coal mining benches of multiple coal seams on the slope against the end bench 30 and building a coal floor bridge 44 connecting the dumping bench and the coal floor on the slope against the coal seam bridge 40 includes:

[0041] S410. Build a first bridge 41 between the dumping bench and the coal mining bench of the first coal seam 21 and against the slope of the end bench 30, so that both ends of the first bridge 41 are connected to the top surface of the first coal seam 21 and the dumping bench. Build a second bridge 42 between the dumping bench and the coal mining bench of the second coal seam 22 and against the slope of the first bridge 41, so that both ends of the second bridge 42 are respectively connected to the second coal seam 22 and the top surface of the dumping bench. Build a third bridge 43 between the dumping bench and the coal mining bench of the third coal seam 23 and against the slope of the second bridge 42, so that both ends of the third bridge 43 are respectively connected to the third coal seam 23 and the top surface of the dumping bench to form a plurality of coal seam bridges 40;

[0042] S420. Build a coal floor bridge 44 between the dumping bench and the coal floor and against the slope of the third bridge 43, so that one end of the coal floor bridge 44 is connected to the top surface of the dumping bench.

[0043] Specifically, in step S410, by constructing the first bridge body 41, the second bridge body 42, and the third bridge body 43, the overburden and coal blocks of the corresponding coal seams can be transported through the corresponding bridge bodies respectively. By constructing the first bridge body 41 against the end slope 30, the side slope of the end slope 30 can be used to support the first bridge body 41, thereby enhancing the strength of the first bridge body 41. And the subsequent second bridge body 42 and third bridge body 43 are constructed using the slope of the corresponding bridge body on the side close to the end slope 30, which can enhance the strength of the second bridge body 42 and the third bridge body 43 and reduce the workload.

[0044] Among them, in step S420, the coal floor bridge body 44 can be constructed using the slope of the third bridge body 43, thereby enhancing the strength of the coal floor bridge body 44 and reducing the workload.

[0045] As Figures 3 to 7 shown, at the preset tracking distance A at the bottom of the slope of the dumping bench of the dumping site 10, the step S200 of pushing the coal roof bench, the overburden benches and the coal mining benches within the preset length B and the preset width C on the side of the working bench 20 close to the end slope 30 in the direction away from the dumping site 10 includes:

[0046] S210. The preset width C is calculated by adding the width D of the first bridge body, the width E of the second bridge body, the width F of the third bridge body, the width G of the coal floor bridge body, the width H of the slope of the coal floor bridge body, the width L of the transportation channel of the coal floor, and a preset coefficient.

[0047] In this embodiment, in step S210, by using the preset width C within the above-mentioned dimension range, it can not only meet the vehicle passing requirements but also not increase the workload.

[0048] Among them, the width D of the first bridge body, the width E of the second bridge body, the width F of the third bridge body, and the width G of the coal floor bridge body all need to meet the requirements of two-way traffic.

[0049] It should be noted that the preset coefficient refers to the sum of the projected widths of the slopes of adjacent two bridge bodies on the coal floor.

[0050] As Figure 1 and Figure 7 shown, at the preset tracking distance A at the bottom of the slope of the dumping bench of the dumping site 10, the step S200 of pushing the coal roof bench, the overburden benches and the coal mining benches within the preset length B and the preset width C on the side of the working bench 20 close to the end slope 30 in the direction away from the dumping site 10 includes:

[0051] S220. The preset length B is calculated by adding the projected length of the coal floor bridge body 44 on the coal floor and the width L of the transportation channel on the coal floor.

[0052] The projected length of the coal floor bridge body 44 on the coal floor is calculated from the height difference between the coal floor and the waste dump bench and the slope of the coal floor bridge body 44.

[0053] Specifically, in step S220, by using the preset length B within the above-mentioned dimension range, it can not only meet the traffic requirements on the side of the coal floor bridge body facing the working bench 20, but also ensure a certain preset tracking distance A between the waste dump 10 and the working bench 20.

[0054] In this embodiment, the preset tracking distance A is 50 m. The slope of the coal floor bridge body 44 is taken within the range of 6% to 8%.

[0055] As Figures 3 to 7 shown, step S410 of building a plurality of coal seam bridge bodies 40 by building a first bridge body 41 between the waste dump bench and the coal mining bench of the first coal seam 21 and against the slope of the end bench 30, connecting the two ends of the first bridge body 41 to the top surface of the first coal seam 21 and the waste dump bench, building a second bridge body 42 between the waste dump bench and the coal mining bench of the second coal seam 22 and against the slope of the first bridge body 41, connecting the two ends of the second bridge body 42 to the top surface of the second coal seam 22 and the waste dump bench respectively, and building a third bridge body 43 between the waste dump bench and the coal mining bench of the third coal seam 23 and against the slope of the second bridge body 42, connecting the two ends of the third bridge body 43 to the top surface of the third coal seam 23 and the waste dump bench respectively includes:

[0056] S411. Transport the first overburden to the first coal seam 21, dump the first overburden along the slope of the end bench 30, and spread the first overburden flat to form the first bridge body 41.

[0057] S412. Transport the second overburden to the second coal seam 22, dump the second overburden along the slope of the first bridge body 41, and spread the second overburden flat to form the second bridge body 42.

[0058] S413. Transport the third overburden to the third coal seam 23, dump the third overburden along the slope of the second bridge body 42, and spread the third overburden flat to form the third bridge body 43.

[0059] S414. Transport the fourth overburden to the coal floor, dump the fourth overburden along the slope of the third bridge body 43, and spread the fourth overburden flat to form the coal floor bridge body 44.

[0060] Specifically, in step S411, the first overburden is transported to the coal mining bench of the first coal seam 21 by a truck, dumped along the slope of the end slope 30, and leveled by a bulldozer so that the width D of the first bridge body meets the requirement of two-way traffic. In step S412, the second overburden is dumped along the slope of the first bridge body 41 in the same way and leveled by a bulldozer so that the width E of the second bridge body meets the requirement of two-way traffic. In step S413, the third overburden is dumped along the slope of the second bridge body 42 in the same way and leveled by a bulldozer so that the width F of the third bridge body meets the requirement of two-way traffic. In step S414, the fourth overburden is dumped along the slope of the third bridge body 43 in the same way and leveled by a bulldozer so that the width G of the coal floor bridge body meets the requirement of two-way traffic.

[0061] In this embodiment, step S411 of transporting the first overburden to the first coal seam 21, dumping the first overburden along the slope of the end slope 30, and leveling the first overburden to form the first bridge body 41 includes:

[0062] S4111. Dump the first overburden from the working slope 20 towards the waste dump 10.

[0063] It should be noted that in step S4111, the truck dumps the overburden from the working slope 20 towards the waste dump 10, which can make the formation of the first bridge body 41 safer and facilitate the transportation and dumping of the truck.

[0064] Among them, the second bridge body 42 and the third bridge body 43 are also formed by dumping from the working slope 20 towards the waste dump 10.

[0065] Specifically, before step S400 of building a plurality of coal seam bridge bodies 40 connecting the waste dump bench and the coal mining benches of multiple coal seams along the slope of the end slope 30 and building a coal floor bridge body 44 connecting the waste dump bench and the coal floor along the slope of the coal seam bridge body 40, it includes:

[0066] S300. Lay gangue on the coal mining bench of each coal seam.

[0067] In this embodiment, in step S300, by laying gangue on the coal mining bench of each coal seam, the coal of this coal seam can be separated from the corresponding overburden, which is convenient for subsequent coal mining.

[0068] Specifically, 2-meter-thick gangue is laid on the contact surface between the end slope bridge and the coal mining bench of the coal seam to prevent the mixing of coal and rock.

[0069] It should be noted that before step S200 of pushing the coal roof bench and the stripping benches and coal mining benches of multiple coal seams within the preset length B and preset width C on the side of the working bench 20 close to the end bench 30 in the direction away from the waste dump 10 at the preset tracking distance A at the slope bottom of the waste dump bench at a distance of 10 from the waste dump:

[0070] S100. Determine the width of each coal seam bridge body 40, the width G of the coal floor bridge body, the width L of the transportation passage on the coal floor, and the projected width of the slope of the coal floor bridge body 44 on the coal floor.

[0071] Specifically, in step S100, by determining the above-mentioned dimensional ranges, planning can be made in advance, and then the coal seams and rock strata within the corresponding area range can be stripped.

[0072] As Figure 8 shown, after step S400 of building multiple coal seam bridge bodies 40 connecting the waste dump bench and the coal mining benches of multiple coal seams on the slope adjacent to the end bench 30 and building a coal floor bridge body 44 connecting the waste dump bench and the coal floor on the slope adjacent to the coal seam bridge body 40, the method for building the end bench bridge of an open-pit coal mine with thick coal seams further includes:

[0073] S500. Demolish the multiple coal seam bridge bodies 40.

[0074] In the present embodiment, in step S500, by demolishing the multiple coal seam bridge bodies 40, the coal covered by the built end bench bridge can be mined, thereby improving the stripping ratio.

[0075] As Figure 8 shown, step S500 of demolishing the multiple coal seam bridge bodies 40 includes:

[0076] S510. Excavate the first stripping material from the working bench 20 to the waste dump 10 until the projection of the excavation position on the coal floor is at a distance of the width L of the transportation passage on the coal floor from the working bench 20, enable the first bridge body 41 and the second bridge body 42 to achieve vehicle passage, transport the first stripping material to the waste dump 10, and level the first stripping material;

[0077] S520. Excavate the first stripping material and the second stripping material from the working bench 20 to the waste dump 10 until the projection of the excavation position on the coal floor is at a distance of the width L of the transportation passage on the coal floor from the working bench 20, enable the first bridge body 41, the second bridge body 42 and the third bridge body 43 to achieve vehicle passage, transport the first stripping material and the second stripping material to the waste dump 10, and level the first stripping material and the second stripping material;

[0078] S530. Excavate the first overburden, the second overburden, and the third overburden from the working bench 20 to the waste dump 10 until the distance between the projection of the excavation position on the coal floor and the working bench 20 is the width L of the transportation channel on the coal floor, and transport the first overburden, the second overburden, and the third overburden to the waste dump 10, and level the first overburden, the second overburden, and the third overburden.

[0079] In this embodiment, in step S510, the first bridge 41 is demolished. By excavating the length of the first bridge 41 until the distance between its projection on the coal floor and the working bench 20 is the width L of the transportation channel on the coal floor, the coal seam covered by the first overburden can be mined, and the traffic requirements of vehicles can be met. Similarly, in steps S520 and S530, the second bridge 42 and the third bridge 43 also need to be excavated to the same length, so as to meet the traffic requirements of vehicles.

[0080] It should be noted that since the coal floor bridge 44 does not cover the coal seam, it is not necessary to demolish the coal floor bridge 44.

[0081] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0082] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters indicate like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0083] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0084] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation other than the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used here should be made.

[0085] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional declaration, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0086] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for building an end - slope bridge in an open - pit mine with thick coal seams, characterized in that, the method for building an end - slope bridge in an open - pit mine with thick coal seams includes: determining the width of each coal - seam bridge body (40), the width of the coal - floor bridge body (44), the width of the transportation channel on the coal floor, and the projected width of the slope of the coal - floor bridge body (44) on the coal floor; at a preset tracking distance from the bottom of the slope of the waste - dumping bench of the waste - dumping yard (10), pushing the coal - roof bench, the stripping benches and the coal - mining benches of multiple coal seams within a preset length and a preset width on the side of the working bench (20) close to the end - slope (30) in a direction away from the waste - dumping yard (10); building multiple coal - seam bridge bodies (40) connecting the waste - dumping bench and the coal - mining benches of multiple coal seams on the slope adjacent to the end - slope (30), and building the coal - floor bridge body (44) connecting the waste - dumping bench and the coal floor on the slope adjacent to the slope of the coal - seam bridge body (40); wherein, the multiple coal seams include a first coal seam (21), a second coal seam (22), and a third coal seam (23) arranged in sequence from top to bottom. Building a first bridge body (41) on the slope between the waste - dumping bench and the coal - mining bench of the first coal seam (21) and adjacent to the end - slope (30), so that both ends of the first bridge body (41) are connected to the top surface of the first coal seam (21) and the waste - dumping bench. Building a second bridge body (42) on the slope between the waste - dumping bench and the coal - mining bench of the second coal seam (22) and adjacent to the slope of the first bridge body (41), so that both ends of the second bridge body (42) are respectively connected to the second coal seam (22) and the top surface of the waste - dumping bench. Building a third bridge body (43) on the slope between the waste - dumping bench and the coal - mining bench of the third coal seam (23) and adjacent to the slope of the second bridge body (42), so that both ends of the third bridge body (43) are respectively connected to the third coal seam (23) and the top surface of the waste - dumping bench to form multiple coal - seam bridge bodies (40); the preset width is calculated by adding the width of the first bridge body (41), the width of the second bridge body (42), the width of the third bridge body (43), the width of the coal - floor bridge body (44), the width of the slope of the coal - floor bridge body (44), the width of the transportation channel on the coal floor, and a preset coefficient; the preset length is calculated by adding the projected length of the coal - floor bridge body (44) on the coal floor and the width of the transportation channel on the coal floor.

2. The method for building an end - slope bridge in an open - pit mine with thick coal seams according to claim 1, characterized in that, the step of building multiple coal - seam bridge bodies (40) connecting the waste - dumping bench and the coal - mining benches of multiple coal seams on the slope adjacent to the end - slope (30), and building the coal - floor bridge body (44) connecting the waste - dumping bench and the coal floor on the slope adjacent to the slope of the coal - seam bridge body (40) includes: building the coal - floor bridge body (44) on the slope between the waste - dumping bench and the coal floor and adjacent to the slope of the third bridge body (43), so that one end of the coal - floor bridge body (44) is connected to the top surface of the waste - dumping bench.

3. The method for building the end - slope bridge in a thick - coal - seam open - pit mine according to claim 2, characterized in that, the step of pushing the coal - roof bench, the stripping benches and the coal - mining benches within a preset length and a preset width on the side of the working bench (20) close to the end - slope (30) in a direction away from the spoil ground (10) at a preset tracking distance from the bottom of the slope of the spoil bench of the spoil ground (10) includes: the projected length of the coal - floor bridge body (44) on the coal floor is calculated from the height difference between the coal floor and the spoil bench and the slope of the coal - floor bridge body (44).

4. The method for building the end - slope bridge in a thick - coal - seam open - pit mine according to claim 2, characterized in that, the step of building the first bridge body (41) between the spoil bench and the coal - mining bench of the first coal seam (21) and against the slope of the end - slope (30), connecting the two ends of the first bridge body (41) to the top surfaces of the first coal seam (21) and the spoil bench, building the second bridge body (42) between the spoil bench and the coal - mining bench of the second coal seam (22) and against the slope of the first bridge body (41), connecting the two ends of the second bridge body (42) to the top surfaces of the second coal seam (22) and the spoil bench respectively, building the third bridge body (43) between the spoil bench and the coal - mining bench of the third coal seam (23) and against the slope of the second bridge body (42), connecting the two ends of the third bridge body (43) to the top surfaces of the third coal seam (23) and the spoil bench respectively to form a plurality of the coal - seam bridge bodies (40) includes: transporting the first stripping material to the first coal seam (21), dumping the first stripping material along the slope of the end - slope (30), and spreading the first stripping material flat to form the first bridge body (41); transporting the second stripping material to the second coal seam (22), dumping the second stripping material along the slope of the first bridge body (41), and spreading the second stripping material flat to form the second bridge body (42); transporting the third stripping material to the third coal seam (23), dumping the third stripping material along the slope of the second bridge body (42), and spreading the third stripping material flat to form the third bridge body (43); transporting the fourth stripping material to the coal floor, dumping the fourth stripping material along the slope of the third bridge body (43), and spreading the fourth stripping material flat to form the coal - floor bridge body (44).

5. The method for building the end - slope bridge in a thick - coal - seam open - pit mine according to claim 4, characterized in that, the step of transporting the first stripping material to the first coal seam (21), dumping the first stripping material along the slope of the end - slope (30), and spreading the first stripping material flat to form the first bridge body (41) includes: dumping the first stripping material in a direction from the working bench (20) towards the spoil ground (10).

6. The method for building the end - slope bridge in a thick - coal - seam open - pit mine according to claim 1, characterized in that, Before the step of building a plurality of coal seam bridges (40) that connect the waste dump bench and the coal mining benches of a plurality of the coal seams on a slope adjacent to the end slope (30), and building a coal floor bridge (44) that connects the waste dump bench and the coal floor on a slope adjacent to the coal seam bridge (40), it includes: Laying coal gangue on the coal mining bench of each of the coal seams.

7. The method for building an end slope bridge of an open-pit mine with thick coal seams according to claim 4, characterized in that, After the step of building a plurality of coal seam bridges (40) that connect the waste dump bench and the coal mining benches of a plurality of the coal seams on a slope adjacent to the end slope (30), and building a coal floor bridge (44) that connects the waste dump bench and the coal floor on a slope adjacent to the coal seam bridge (40), the method for building an end slope bridge of an open-pit mine with thick coal seams further includes: Demolishing a plurality of the coal seam bridges (40).

8. The method for building an end slope bridge of an open-pit mine with thick coal seams according to claim 7, characterized in that, The step of demolishing a plurality of the coal seam bridges (40) includes: Excavating the first overburden from the working slope (20) to the waste dump (10) until the distance between the projection of the excavation position on the coal floor and the working slope (20) is the width of the transportation channel of the coal floor, enabling vehicle passage between the first bridge (41) and the second bridge (42), transporting the first overburden to the waste dump (10), and leveling the first overburden; Excavating the first overburden and the second overburden from the working slope (20) to the waste dump (10) until the distance between the projection of the excavation position on the coal floor and the working slope (20) is the width of the transportation channel of the coal floor, enabling vehicle passage between the first bridge (41), the second bridge (42) and the third bridge (43), transporting the first overburden and the second overburden to the waste dump (10), and leveling the first overburden and the second overburden; Excavating the first overburden, the second overburden and the third overburden from the working slope (20) to the waste dump (10) until the distance between the projection of the excavation position on the coal floor and the working slope (20) is the width of the transportation channel of the coal floor, transporting the first overburden, the second overburden and the third overburden to the waste dump (10), and leveling the first overburden, the second overburden and the third overburden.

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