CN115110956A - Method for building end slope bridge of thick-seam strip mine - Google Patents

Abstract

The invention provides a method for building a thick-seam strip mine end slope bridge, which comprises the following steps: pushing coal top plate steps and stripping steps of a plurality of coal seams and coal mining steps at a preset tracking distance from the sloping bottom of the dumping steps of the dumping site to the side, close to the end wall, of the working wall in a preset length and a preset width along the direction far away from the dumping site; and building a plurality of coal bed bridge bodies for connecting the soil discharging steps and the coal mining steps of a plurality of coal beds on the side slopes attached to the end walls, and building a coal bottom plate bridge body for connecting the soil discharging steps and the coal bottom plate on the slope attached to the coal bed bridge bodies. Through the technical scheme that this application provided, can solve the great problem that reduces production efficiency of below end group bridge truck throughput among the correlation technique.

Description

End slope bridge building method for thick coal seam strip mine

Technical Field

The invention relates to the technical field of coal mining, in particular to a method for constructing a thick coal seam strip mine end slope bridge.

Background

Mining of strip mines requires stripping of the cuttings above the coal seam to expose the coal seam. During mining, the strippings need to be separated from the coal and transported to the dump. Wherein, the waste dump is divided into an inner waste dump and an outer waste dump.

In the related art, the stripped objects are discharged to a waste dump through an end slope transportation road, the end slope transportation road is constructed in a mode that an end slope bridge is built on a coal seam roof towards the inner waste dump, each horizontal layered coal seam is arranged by adopting a moving pit line, and the coal seam roof is lifted layer by layer to enter the waste dump through the end slope bridge. The step strippers of at least two working slopes correspond to one step of the refuse dump, and the step strippers and the mined coal below need to be lifted to the nearest end slope conveying channel.

However, with the end bridge construction method in the related art, the throughput of the lower end bridge truck is large, and the stripping truck and the coal truck are operated in a crossing manner. If the truck breaks down when passing, the transportation system is temporarily broken down, and the production efficiency is reduced.

Disclosure of Invention

The invention provides a method for building an end slope bridge of a thick-seam strip mine, which aims to solve the problem that the production efficiency is reduced because the quantity of trucks passing through the lower end slope bridge is large in the related technology.

The invention provides a method for building an end slope bridge of a thick-seam strip mine, which comprises the following steps: pushing a coal roof step and stripping steps of a plurality of coal seams and a coal mining step along a direction far away from the dump at a preset tracking distance from the sloping bottom of a dumping step of the dump; and building a plurality of coal bed bridge bodies for connecting the soil discharging steps and the coal mining steps of a plurality of coal beds on the side slopes attached to the end walls, and building a coal bottom plate bridge body for connecting the soil discharging steps and the coal bottom plate on the slope attached to the coal bed bridge bodies.

Further, a plurality of coal seams are including the first coal seam, second coal seam and the third coal seam that from top to bottom arrange in proper order, are leaning on in a plurality of coal seam pontics of the side slope building connection dumping step of end group and the coal mining step of a plurality of coal seams, lean on the step of leaning on in the slope of putting of coal seam pontics building the coal bottom plate pontics of connecting dumping step and coal bottom plate and including: building a first bridge body between the soil discharging step and the coal mining step of the first coal seam and attached to the side slope of the end slope, enabling two ends of the first bridge body to be connected with the top surfaces of the first coal seam and the soil discharging step, building a second bridge body between the soil discharging step and the coal mining step of the second coal seam and attached to the slope of the first bridge body, enabling two ends of the second bridge body to be respectively connected with the top surfaces of the second coal seam and the soil discharging step, building a third bridge body between the soil discharging step and the coal mining step of the third coal seam and attached to the slope of the second bridge body, and enabling two ends of the third bridge body to be respectively connected with the top surfaces of the third coal seam and the soil discharging step to form a plurality of coal seam bridge bodies; and building a coal bottom plate bridge body between the soil discharging step and the coal bottom plate and attached to the slope of the third bridge body, so that one end of the coal bottom plate bridge body is connected with the top surface of the soil discharging step.

Further, at the preset tracking distance department of the sloping bottom of the dumping step apart from the refuse dump, the step of advancing the preset length of one side of the working slope close to the end slope and the coal roof step and the coal mining step of the stripping step and the coal mining step in the preset width along the direction far away from the refuse dump comprises: the preset width is obtained by adding and calculating the width of the first bridge body, the width of the second bridge body, the width of the third bridge body, the width of the coal bottom plate bridge body, the width of the slope of the coal bottom plate bridge body, the width of the transportation channel of the coal bottom plate and a preset coefficient.

Further, at the preset tracking distance department of the sloping bottom of the dumping step apart from the refuse dump, the step of advancing the preset length of one side of the working slope close to the end slope and the coal roof step and the coal mining step of the stripping step and the coal mining step in the preset width along the direction far away from the refuse dump comprises: the preset length is obtained by adding the projection length of the coal bottom plate bridge body on the coal bottom plate and the width of the transportation channel of the coal bottom plate; the projection length of the coal bottom plate bridge body on the coal bottom plate is calculated by the height difference between the coal bottom plate and the soil discharging step and the gradient of the coal bottom plate bridge body.

Further, the step of building a first bridge body between the soil discharging step and the coal mining step of the first coal bed and attached to the side slope of the end slope, the top surfaces of the first coal bed and the soil discharging step are connected at the two ends of the first bridge body, the second bridge body is built between the soil discharging step and the coal mining step of the second coal bed and attached to the slope of the first bridge body, the top surfaces of the second coal bed and the soil discharging step are connected at the two ends of the second bridge body respectively, the third bridge body is built between the soil discharging step and the coal mining step of the third coal bed and attached to the slope of the second bridge body, the top surfaces of the third coal bed and the soil discharging step are connected at the two ends of the third bridge body respectively, and the step of forming a plurality of coal bed bridge bodies comprises: transporting the first stripping object to a first coal seam, dumping the first stripping object along the side slope of the end slope, and flattening the first stripping object to form a first bridge body; transporting the second stripping object to a second coal seam, pouring the second stripping object along the slope of the first bridge body, and flattening the second stripping object to form a second bridge body; transporting the third stripping object to a third coal seam, pouring the third stripping object along the slope of the second bridge body, and flattening the third stripping object to form a third bridge body; and transporting the fourth stripping object to the coal bottom plate, pouring the fourth stripping object along the slope of the third bridge body, and flattening the fourth stripping object to form the coal bottom plate bridge body.

Further, the step of transporting the first stripper to the first coal seam, dumping the first stripper along the slope of the end slope, and flattening the first stripper to form the first bridge includes: and pouring the first stripping object from the working side to the direction of the waste dump.

Further, leaning on a plurality of coal seam pontics of the side slope building connection dumping step and the coal mining step in a plurality of coal seams of end group, leaning on the step of leaning on the slope building connection dumping step of coal seam pontics and the coal floor pontics of coal floor and including before: and paving coal gangue on the coal mining steps of each coal seam.

Further, at the preset tracking distance department of the sloping bottom of the dumping step apart from the refuse dump, include before the step of carrying out the lapse along the direction of keeping away from the refuse dump to the coal roof step and the coal mining step of peeling off the step and the coal mining step of the multiple coal seams of the preset length and the preset width of one side that the work group is close to the end group: and determining the width of each coal bed bridge body, the width of the coal floor bridge body, the width of a transportation channel of the coal floor and the projection width of the slope of the coal floor bridge body on the coal floor.

Further, after the step of building a coal bed bridge body connecting the dumping step and the coal bed floor by leaning against the slope of the end slope, the method for building the end slope bridge of the thick coal bed strip mine further comprises the following steps: and (4) removing a plurality of coal seam bridge bodies.

Further, the step of dismantling a plurality of coal seam bridges comprises: digging a first stripping object from the working side to the refuse dump until the distance between the projection of the coal bottom plate at the digging position and the working side is the width of a transportation channel of the coal bottom plate, enabling the first bridge body and the second bridge body to realize vehicle passing, transporting the first stripping object to the refuse dump, and flattening the first stripping object; excavating a first stripping object and a second stripping object from a working side to a dump until the distance between the projection of the coal bottom plate at the excavation position and the working side is the width of a transportation channel of the coal bottom plate, enabling the first bridge body, the second bridge body and the third bridge body to realize vehicle passing, transporting the first stripping object and the second stripping object to the dump, and flattening the first stripping object and the second stripping object; digging a first stripping object, a second stripping object and a third stripping object from the working side to the dump until the distance between the projection of the coal bottom plate and the working side at the digging position is the width of the transportation channel of the coal bottom plate, transporting the first stripping object, the second stripping object and the third stripping object to the dump, and flattening the first stripping object, the second stripping object and the third stripping object.

By applying the technical scheme of the invention, the coal roof steps and the stripping steps of the plurality of coal seams and the coal mining steps in the preset length and the preset width of one side of the working slope close to the end slope are pushed in advance at the preset tracking distance from the sloping bottom of the soil discharging step of the soil discharging field along the direction far away from the soil discharging field, so that the coal seams and rock stratums in the area can be cleaned, a space can be provided for building an end slope bridge, the bridge body in the area does not need to be dismantled subsequently, the workload is reduced, and the working efficiency is improved. And then can be in leaning on the side slope building connection dumping step and a plurality of coal seam coal mining step's a plurality of coal seam pontics to lean on the slope building connection dumping step and the coal floor pontics of coal floor who leans on in the coal seam pontics. Thereby can utilize a plurality of coal seam pontoons to carry the thing that peels off that corresponds the coal seam to the step of dumping and abandon to the coal cinder that will correspond the coal seam passes through the coal seam pontoons and the step of dumping and transports to corresponding broken station. The coal bottom plate bridge body is utilized to convey the stripped objects of the coal layer at the bottom to the soil discharging step for discharging, and the coal blocks of the coal layer at the bottom are conveyed to the corresponding crushing station through the coal layer bridge body and the soil discharging step. As the coal blocks and the stripped objects of different coal beds are transported through different end slope bridges, compared with the trucks of the end slope bridges in the related art, the end slope bridges can not be gathered, the throughput is small, and the production efficiency is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a flow chart of a method for constructing an end slope bridge of a thick-seam strip mine according to an embodiment of the invention;

FIG. 2 is a schematic diagram illustrating the movement of a working surface away from a dump according to an embodiment of the present invention;

FIG. 3 illustrates a schematic structural diagram of a first bridge construction provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic structural diagram illustrating construction of a second bridge according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram illustrating construction of a third bridge according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram illustrating the construction of a coal bed bridge according to an embodiment of the present invention;

FIG. 7 shows a partial enlarged view at Z in FIG. 5;

fig. 8 shows a structural diagram of a coal seam bridge dismantling method provided by the embodiment of the invention.

Wherein the figures include the following reference numerals:

10. a refuse dump;

20. a working upper; 21. a first coal seam; 22. a second coal seam; 23. a third coal seam;

30. end uppers;

40. a coal seam bridge body; 41. a first bridge body; 42. a second bridge; 43. a third bridge; 44. a coal bed plate bridge body;

A. presetting a tracking distance; B. presetting the length; C. presetting the width; D. a width of the first bridge; E. a width of the second bridge; F. the width of the third bridge; G. the width of the coal bed plate bridge body; H. the width of the slope of the bridge body of the coal bottom plate; l, the width of the transportation channel of the coal bottom plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 7, an embodiment of the present invention provides a method for building an end slope bridge of a thick-seam opencast mine, where the method for building an end slope bridge of a thick-seam opencast mine includes:

s200, pushing a coal roof step and stripping steps of a plurality of coal seams and a coal mining step within a preset length B and a preset width C of one side, close to the end slope 30, of the working slope 20 at a preset tracking distance A from the slope bottom of the dumping step of the dump 10 along the direction far away from the dump 10;

s400, building a plurality of coal seam bridge bodies 40 for connecting the soil discharging steps and the coal mining steps of a plurality of coal seams on the side slope attached to the end slope 30, and building a coal bottom plate bridge body 44 for connecting the soil discharging steps and the coal bottom plate on the slope attached to the coal seam bridge body 40.

By applying the technical scheme of the invention, the coal roof step and the stripping steps of a plurality of coal seams and the coal mining step in the preset length and the preset width of one side, close to the end slope 30, of the working slope 20 are pushed along the direction far away from the dump 10 at the preset tracking distance from the sloping bottom of the dumping step of the dump 10, so that the coal seams and rock stratums in the area can be cleaned, a space can be provided for the construction of an end slope bridge, the bridge body in the area does not need to be dismantled subsequently, the workload is reduced, and the working efficiency is improved. Further, a plurality of coal bed bridges 40 connecting the refuse disposal step and the coal mining steps of the plurality of coal beds may be constructed on the side slope abutting against the end wall 30, and a coal bed bridge 44 connecting the refuse disposal step and the coal bed may be constructed on the side slope abutting against the coal bed bridge 40. Therefore, the stripped objects of the corresponding coal beds can be transported to the soil removal steps by utilizing the plurality of coal bed bridge bodies 40 for removing, and the coal blocks of the corresponding coal beds are transported to the corresponding crushing stations through the coal bed bridge bodies 40 and the soil removal steps. The coal bed bridge 44 can be used for transporting the stripped objects of the lowest coal bed to the dumping step for dumping, and transporting the coal blocks of the lowest coal bed to the corresponding crushing station through the coal bed bridge 40 and the dumping step. Because the coal blocks and the stripping materials of different coal seams are transported through different end slope bridges, compared with the trucks of the end slope bridges in the related technology, the end slope bridge has the advantages of no aggregation, small throughput and improved production efficiency.

In step S200, in order to reduce subsequent workload, the coal roof step and the stripping step and the coal mining step of the plurality of coal seams within the preset length B and the preset width C of the working slope 20 close to the end slope 30 are advanced along the direction far away from the dump 10 at the preset tracking distance a from the sloping bottom of the dumping step of the dump 10, so as to provide a space for building an end slope bridge, and the coal seams and rock stratums in the area are cleaned, so that the bridge in the area does not need to be dismantled subsequently.

In this embodiment, in step S400, a plurality of coal bed bridges 40 connecting the dumping step and the coal mining steps of a plurality of coal beds are built on the side slope adjacent to the end slope 30, a coal bed bridge 44 connecting the dumping step and the coal bed is built on the caving slope adjacent to the coal bed bridge 40, and further, the stripped objects of the corresponding coal bed can be transported to the dumping step through the plurality of coal bed bridges 40 and the coal bed bridge 44 for dumping, and the coal blocks of the corresponding coal bed are transported to the corresponding crushing station through the coal bed bridges 40 and the dumping step.

In step S400, in the process that the coal roof step and the stripping step and the coal mining step of the plurality of coal seams are pushed in the direction away from the waste dump 10, the coal roof step and the stripping step and the coal mining step of the plurality of coal seams are all pushed in the direction away from the waste dump 10 while maintaining a certain step width.

As shown in fig. 3 to 7, the plurality of coal seams include a first coal seam 21, a second coal seam 22, and a third coal seam 23 sequentially arranged from top to bottom, the step S400 of building a plurality of coal seam bridges 40 connecting the dumping step and the coal mining steps of the plurality of coal seams at the side slope attached to the end slope 30, and building a coal bed bridge 44 connecting the dumping step and the coal bed at the slope attached to the coal seam bridge 40 includes:

s410, building a first bridge body 41 between the soil removal steps and the coal mining steps of the first coal seam 21 and attached to the side slope of the end slope 30, enabling two ends of the first bridge body 41 to be connected with the top surfaces of the first coal seam 21 and the soil removal steps, building a second bridge body 42 between the soil removal steps and the coal mining steps of the second coal seam 22 and attached to the slope of the first bridge body 41, enabling two ends of the second bridge body 42 to be respectively connected with the top surfaces of the second coal seam 22 and the soil removal steps, building a third bridge body 43 between the soil removal steps and the coal mining steps of the third coal seam 23 and attached to the slope of the second bridge body 42, and enabling two ends of the third bridge body 43 to be respectively connected with the top surfaces of the third coal seam 23 and the soil removal steps to form a plurality of coal seam bridge bodies 40;

s420, building a coal bottom plate bridge body 44 between the soil discharging step and the coal bottom plate and attached to the slope of the third bridge body 43, so that one end of the coal bottom plate bridge body 44 is connected with the top surface of the soil discharging step.

Specifically, in step S410, by constructing the first bridge 41, the second bridge 42, and the third bridge 43, the stripped object and the coal block of the corresponding coal seam may be transported through the corresponding bridges, respectively. By building the first bridge 41 against the end slope 30, the first bridge 41 can be supported by the slope of the end slope 30, thereby improving the strength of the first bridge 41. And the subsequent second bridge body 42 and third bridge body 43 are built by utilizing the slope of the corresponding bridge body on the side close to the end slope 30, so that the strength of the second bridge body 42 and third bridge body 43 can be improved, and the workload can be reduced.

In step S420, the slope of the third bridge 43 may be used to build the coal bed bridge 44, so as to increase the strength of the coal bed bridge 44 and reduce the workload.

As shown in fig. 3 to 7, at a preset tracking distance a from the slope bottom of the discharging step of the refuse dump 10, the step S200 of pushing the coal roof step and the coal mining step of the plurality of coal seams within a preset length B and a preset width C of the working slope 20 on the side close to the end slope 30 in the direction away from the refuse dump 10 includes:

s210, the preset width C is obtained by adding and calculating 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 bottom plate bridge body, the width H of the slope of the coal bottom plate bridge body, the width L of the transportation channel of the coal bottom plate and a preset coefficient.

In the present embodiment, in step S210, the preset width C in the above size range is adopted, so that the passing requirement of the vehicle can be met, and the workload is not increased.

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 bottom plate bridge body all need to meet the requirement of two-way traffic.

It should be noted that the preset coefficient refers to the sum of the projection widths of the slopes of two adjacent bridges on the coal bottom plate.

As shown in fig. 1 and 7, the step S200 of pushing the coal roof step and the coal mining step of the coal seams and the stripping step of the working slope 20 within the preset length B and the preset width C at the preset tracking distance a from the sloping bottom of the dumping step of the refuse dump 10 in the side close to the end slope 30 along the direction far from the refuse dump 10 includes:

s220, the preset length B is obtained by adding the projection length of the coal bottom plate bridge body 44 on the coal bottom plate and the width L of the transportation channel of the coal bottom plate;

the projection length of the coal bottom plate bridge 44 on the coal bottom plate is calculated by the height difference between the coal bottom plate and the soil discharging step and the gradient of the coal bottom plate bridge 44.

Specifically, in step S220, the preset length B within the above size range is adopted, so that the side of the coal bed bridge facing the working upper 20 can meet the requirement of vehicle passing, and a certain preset tracking distance a is provided between the refuse dump 10 and the working upper 20.

In the present embodiment, the predetermined tracking distance a is 50 m. The slope of the coal bed bridge 44 is between 6% and 8%.

As shown in fig. 3 to 7, the step S410 of constructing a first bridge 41 between the soil-discharging step and the coal-mining step of the first coal seam 21 and abutting against the side slope of the end slope 30, connecting both ends of the first bridge 41 with the top surfaces of the first coal seam 21 and the soil-discharging step, constructing a second bridge 42 between the soil-discharging step and the coal-mining step of the second coal seam 22 and abutting against the slope of the first bridge 41, connecting both ends of the second bridge 42 with the top surfaces of the second coal seam 22 and the soil-discharging step, respectively, constructing a third bridge 43 between the soil-discharging step and the coal-mining step of the third coal seam 23 and abutting against the slope of the second bridge 42, and connecting both ends of the third bridge 43 with the top surfaces of the third coal seam 23 and the soil-discharging step, respectively, to form a plurality of coal seam bridges 40 includes:

s411, transporting the first stripping objects to the first coal seam 21, dumping the first stripping objects along the side slope of the end slope 30, and flattening the first stripping objects to form a first bridge body 41;

s412, transporting the second stripping objects to the second coal seam 22, dumping the second stripping objects along the slope of the first bridge body 41, and flattening the second stripping objects to form a second bridge body 42;

s413, transporting the third stripping object to the third coal seam 23, dumping the third stripping object along the slope of the second bridge body 42, and flattening the third stripping object to form a third bridge body 43;

and S414, transporting the fourth stripping object to the coal bottom plate, dumping the fourth stripping object along the slope of the third bridge body 43, and flattening the fourth stripping object to form the coal bottom plate bridge body 44.

Specifically, in step S411, the first stripped object is transported to the coal mining bench of the first coal seam 21 by a truck, and the first stripped object is dumped along the side slope of the end slope 30 and flattened by a bulldozer, so that the width D of the first bridge body meets the requirement of bidirectional traffic. In step S412, the second stripped object is dumped along the slope of the first bridge body 41 in the same manner, and is flattened 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 stripped object is dumped along the slope of the second bridge 42 in the same manner, and is flattened by a bulldozer, so that the width F of the third bridge meets the requirement of two-way traffic. In step S414, the fourth stripped object is dumped along the slope of the third bridge 43 in the same manner, and is flattened by a bulldozer, so that the width G of the coal bed bridge meets the requirement of two-way traffic.

In this embodiment, the step S411 of transporting the first stripped object to the first coal seam 21, dumping the first stripped object along the slope of the end slope 30, and flattening the first stripped object to form the first bridge 41 includes:

s4111, dumping the first stripped object from the working slope 20 to the direction of the waste dump 10.

In step S4111, the truck pours the stripped object along the working side 20 toward the dump 10, so that the first bridge 41 is formed more safely and the truck can be transported and poured easily.

The second bridge 42 and the third bridge 43 are also formed to incline from the working upper 20 toward the dump 10.

Specifically, before step S400 of building a plurality of coal bed bridges 40 connecting the refuse disposal step and the coal mining steps of a plurality of coal beds on the side slope abutting on the end slope 30, step S400 of building a coal bed bridge 44 connecting the refuse disposal step and the coal bed plate on the side slope abutting on the coal bed bridge 40 includes:

s300, paving coal gangue on coal mining steps of each coal seam.

In this embodiment, in step S300, by paving the coal gangue on the coal mining step of each coal seam, the coal of the coal seam can be separated from the corresponding stripping object, so as to facilitate subsequent coal mining.

Specifically, coal gangue with the thickness of 2 meters is paved on the contact surface of the end slope bridge and the coal mining steps of the coal seam, so that coal rock mixing is prevented.

It should be noted that, at the preset tracking distance a from the slope bottom of the dumping step of the dump 10, the step S200 of pushing the coal roof step and the coal mining step within the preset length B and the preset width C of the working slope 20 on the side close to the end slope 30 along the direction far from the dump 10 includes:

s100, determining the width of each coal bed bridge 40, the width G of each coal bed bridge, the width L of a transportation channel of the coal bed and the projection width of the slope of each coal bed bridge 44 on the coal bed.

Specifically, in step S100, by determining the size range, a plan can be made in advance, and the coal seam and the rock formation in the corresponding area range are stripped.

As shown in fig. 8, after the step S400 of building a plurality of coal seam bridges 40 connecting the dumping step and the coal mining steps of a plurality of coal seams on the side slope abutting against the end slope 30 and building a coal floor bridge 44 connecting the dumping step and the coal floor on the side slope abutting against the coal seam bridge 40, the method for building an end slope bridge of a thick coal seam open pit further includes:

and S500, removing a plurality of coal seam bridge bodies 40.

In this embodiment, in step S500, by removing a plurality of coal seam bridge bodies 40, the coal of the constructed end slope bridge gland can be mined, so that the stripping ratio can be improved.

As shown in fig. 8, the step S500 of dismantling a plurality of coal seam bridges 40 includes:

s510, excavating a first stripping object from the working slope 20 to the refuse dump 10 until the distance between the projection of the coal bottom plate at the excavation position and the working slope 20 is the width L of the transportation channel of the coal bottom plate, enabling the first bridge body 41 and the second bridge body 42 to realize vehicle passing, transporting the first stripping object to the refuse dump 10, and flattening the first stripping object;

s520, excavating a first stripping object and a second stripping object from the working upper 20 to the dump 10 until the distance between the projection of the coal bottom plate and the working upper 20 at the excavating position is the width L of the transportation channel of the coal bottom plate, enabling the first bridge body 41, the second bridge body 42 and the third bridge body 43 to realize vehicle passing, transporting the first stripping object and the second stripping object to the dump 10, and flattening the first stripping object and the second stripping object;

s530, excavating a first stripping object, a second stripping object and a third stripping object from the working slope 20 to the dump 10 until the distance between the projection of the coal bottom plate and the working slope 20 at the excavation position is the width L of the transportation channel of the coal bottom plate, transporting the first stripping object, the second stripping object and the third stripping object to the dump 10, and flattening the first stripping object, the second stripping object and the third stripping object.

In this embodiment, in step S510, the first bridge body 41 is removed, and the first bridge body 41 is excavated to a length that the distance between the projection of the first bridge body 41 on the coal floor and the working slope 20 is the width L of the transportation channel of the coal floor, so that the coal seam covered under the first stripping object can be mined, and the traffic requirement of the vehicle can be met. Similarly, in step S520 and step S530, the second axle body 42 and the third axle body 43 need to be excavated to the same length so as to meet the vehicle passing requirement.

It should be noted that, since the coal bed bridge 44 does not cover the coal bed, the coal bed bridge 44 does not need to be dismantled.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for building an end slope bridge of a thick-seam strip mine is characterized by comprising the following steps:

pushing a coal roof step and a stripping step and a coal mining step of a plurality of coal seams at a preset tracking distance from the slope bottom of a dumping step of the dumping site (10) to the side, close to the end slope (30), of the working slope (20) within a preset length and a preset width along the direction far away from the dumping site (10);

the side slope clinging to the end slope (30) is constructed and connected with the soil discharging step and a plurality of coal bed bridge bodies (40) of the coal mining steps of the coal bed, and the slope releasing of the coal bed bridge bodies (40) is constructed and connected with the coal bottom plate bridge bodies (44) of the soil discharging step and the coal bottom plate.

2. The method for constructing an end slope bridge of a thick coal seam opencut according to claim 1, wherein the plurality of coal seams comprise a first coal seam (21), a second coal seam (22) and a third coal seam (23) which are sequentially arranged from top to bottom, a plurality of coal seam bridges (40) for connecting the soil removal step with a plurality of coal mining steps of the coal seams are constructed on the side slope attached to the end slope (30), and a coal floor bridge (44) for connecting the soil removal step with a coal floor is constructed on the slope attached to the coal seam bridge (40) comprises:

building a first bridge body (41) between the soil discharging step and the coal mining step of the first coal seam (21) and attached to the side slope of the end slope (30), enabling two ends of the first bridge body (41) to be connected with the first coal seam (21) and the top surface of the soil discharging step, building a second bridge body (42) between the soil discharging step and the coal mining step of the second coal seam (22) and attached to the slope of the first bridge body (41), so that two ends of the second bridge body (42) are respectively connected with the second coal seam (22) and the top surface of the soil discharging step, building a third bridge body (43) between the dumping steps and the coal mining steps of the third coal seam (23) and attached to the slope of the second bridge body (42), so that two ends of the third bridge body (43) are respectively connected with the third coal seam (23) and the top surface of the dumping steps to form a plurality of coal seam bridge bodies (40);

and building a coal bottom plate bridge body (44) between the soil discharging step and the coal bottom plate and attached to the slope of the third bridge body (43), so that one end of the coal bottom plate bridge body (44) is connected with the top surface of the soil discharging step.

3. The method for constructing the end slope bridge of the thick coal seam open-pit mine according to claim 2, wherein the step of pushing the coal roof step within the preset length and the preset width of the side of the working slope (20) close to the end slope (30) and the stripping step and the coal mining step of the plurality of coal seams in the direction away from the dump (10) at the preset tracking distance from the sloping bottom of the dumping step of the dump (10) comprises:

the preset width is obtained 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 bottom plate bridge body (44), the width of the slope of the coal bottom plate bridge body (44), the width of the transportation channel of the coal bottom plate and a preset coefficient.

4. The method for constructing the end slope bridge of the thick coal seam open-pit mine according to claim 2, wherein the step of pushing the coal roof step within the preset length and the preset width of the side of the working slope (20) close to the end slope (30) and the stripping step and the coal mining step of the plurality of coal seams in the direction away from the dump (10) at the preset tracking distance from the sloping bottom of the dumping step of the dump (10) comprises:

the preset length is obtained by adding the projection length of the coal bottom plate bridge body (44) on the coal bottom plate and the width of a transportation channel of the coal bottom plate;

the projection length of the coal bottom plate bridge body (44) on the coal bottom plate is calculated by the height difference between the coal bottom plate and the soil discharging step and the gradient of the coal bottom plate bridge body (44).

5. The thick coal seam opencast mine end slope bridge construction method according to claim 2, characterized in that a first bridge body (41) is constructed between the said dumping step and the coal mining step of the first coal seam (21) and against the side slope of the said end slope (30), both ends of the first bridge body (41) are connected to the top surface of the said first coal seam (21) and the said dumping step, a second bridge body (42) is constructed between the said dumping step and the coal mining step of the said second coal seam (22) and against the side slope of the said first bridge body (41), both ends of the said second bridge body (42) are constructed with the top surface of the said second coal seam (22) and the said dumping step, respectively, a third bridge body (43) is constructed between the said dumping step and the coal mining step of the said third coal seam (23) and against the side slope of the said second bridge body (42), both ends of the said third bridge body (43) are constructed with the said third coal seam (23) and the top surface of the said dumping step, the step of forming a plurality of coal seam bridges (40) comprises:

transporting a first stripper to the first coal seam (21), dumping the first stripper along a slope of the end slope (30), and flattening the first stripper to form the first bridge (41);

transporting a second stripper to the second coal seam (22), dumping the second stripper along a slope of the first bridge (41), and flattening the second stripper to form the second bridge (42);

transporting a third stripper to the third coal seam (23), dumping the third stripper along a slope of the second bridge (42), and flattening the third stripper to form the third bridge (43);

transporting a fourth lift to the coal bed, dumping the fourth lift along a slope of the third bay (43), and flattening the fourth lift to form the coal bed bay (44).

6. The method of constructing an end slope bridge of a thick coal seam opencast mine according to claim 5, wherein the steps of transporting a first stripper to the first coal seam (21), dumping the first stripper along a slope of the end slope (30), and flattening the first stripper to form the first bridge body (41) comprise:

and pouring the first stripping object from the working upper (20) to the direction of the waste dump (10).

7. The method for constructing an end slope bridge of a thick coal seam opencast mine according to claim 1, wherein a plurality of coal seam bridges (40) connecting the dumping step and a plurality of coal seam mining steps are constructed on the side slope abutting on the end slope (30), and a coal floor bridge (44) connecting the dumping step and a coal floor is constructed on the side slope abutting on the coal seam bridge (40) before the step of constructing the coal floor bridge (44) connecting the dumping step and the coal floor:

and paving coal gangue on the coal mining step of each coal seam.

8. The method for constructing an end slope bridge of a thick coal seam open-pit mine according to claim 1, wherein the step of pushing the coal roof step within a preset length and a preset width of one side of the working slope (20) close to the end slope (30) and the stripping step and the coal mining step of the plurality of coal seams in a direction away from the dump (10) at a preset tracking distance from the sloping bottom of the dumping step of the dump (10) comprises the steps of:

determining the width of each coal bed bridge (40), the width of the coal bed bridge (44), the width of a transportation channel of the coal bed and the projection width of the slope of the coal bed bridge (44) on the coal bed.

9. The method for constructing an end slope bridge of a thick coal seam opencast mine according to claim 5, wherein after the step of constructing a plurality of coal seam bridges (40) connecting the dumping step and a plurality of coal seam mining steps by abutting against the side slope of the end slope (30), the method for constructing an end slope bridge of a thick coal seam opencast mine further comprises:

removing a plurality of the coal seam bridges (40).

10. The method of constructing an end slope bridge of a thick coal seam opencast according to claim 9, wherein the step of dismantling a plurality of coal seam pontoons (40) comprises:

digging the first stripped object from the working upper (20) to the dump (10) until the distance between the projection of the coal floor and the working upper (20) at the digging position is the width of a transportation channel of the coal floor, enabling the first bridge body (41) and the second bridge body (42) to realize vehicle passing, transporting the first stripped object to the dump (10), and flattening the first stripped object;

excavating the first stripping object and the second stripping object from the working upper (20) to the refuse dump (10) until the distance between the projection of the coal base plate at the excavation position and the working upper (20) is the width of a transportation channel of the coal base plate, enabling the first bridge body (41) and the second bridge body (42) and the third bridge body (43) to realize vehicle passing, transporting the first stripping object and the second stripping object to the refuse dump (10), and flattening the first stripping object and the second stripping object;

digging the first stripping object, the second stripping object and the third stripping object from the working upper (20) to the dumping ground (10), enabling the distance between the projection of the coal base plate at the digging position and the working upper (20) to be the width of a transportation channel of the coal base plate, transporting the first stripping object, the second stripping object and the third stripping object to the dumping ground (10), and flattening the first stripping object, the second stripping object and the third stripping object.

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