Intermediate bridge quick dismantling and pressed coal recycling method based on throwing blasting

Abstract

The invention discloses an intermediate bridge rapid dismantling and pressed coal recovery method based on throwing blasting, a bridge body dismantling area is divided into a bridge body primary dismantling area and a bridge body secondary dismantling area, a coal step is divided into a coal step primary coal mining area and a coal step secondary coal mining area, the first step is bridge body primary dismantling; 2, primary coal mining; thirdly, the bridge body is dismantled for the second time; and 4, secondary coal mining. According to the method, the materials in the bridge body demolition area are crushed and thrown through the throwing blasting method, the purpose of dispersing the materials in the bridge body demolition area is achieved, on one hand, the materials in the middle bridge position and the goaf position can be stripped at the same time, the bridge body demolition time is shortened, and the bridge body is communicated in advance; on the other hand, the wide space of the goaf is fully combined with storage of secondary stripping materials, the secondary stripping workload of the bridge body dismantling area is reduced, and the secondary stripping cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of open-pit coal mining, and in particular to a method for quickly dismantling an intermediate bridge and recovering compressed coal based on cast blasting. Background Art

[0002] In the related art, when the coal mining operation reaches the position of the middle bridge, in order to mine the compressed coal of the bridge body, the middle bridge body begins to face the problem of demolition. The existing secondary stripping mainly consists of two parts: perforation blasting and lowering mining and loading. During construction, in order to ensure safety, perforation blasting is first carried out at the junction of coal and rock to prepare for secondary stripping, and then a front loader or bulldozer is used to carry out the lowering operation, and then the secondary stripping material is completely mined and loaded until the raw coal step is completely exposed. However, when this method is used to demolish the bridge body, the number of mining and loading equipment working at the same time is limited, and the efficiency of secondary stripping cannot be fully utilized, resulting in a long time for bridge demolition and a delay in bridge penetration, affecting the function of the middle bridge as a transportation channel connecting the mining area and the inner dump; and the materials above the raw coal step need to be completely mined, and the workload of secondary stripping is large. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to propose a method for rapid removal of the intermediate bridge and compressed coal recovery based on throwing blasting, which can solve the problems of large secondary stripping workload and low efficiency of intermediate bridge removal, reduce the secondary stripping workload, shorten the removal time of the intermediate bridge, speed up the connection of the intermediate bridge, and ensure the function of the intermediate bridge as a transportation channel connecting the mining area and the inner dump.

[0004] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes a method for rapid demolition and compressed coal recovery of an intermediate bridge based on cast blasting, wherein the intermediate bridge comprises an intermediate bridge retention area and a bridge body demolition area, one side of the intermediate bridge retention area is connected to an inner spoil dump, one side of the bridge body demolition area is connected to a coal step, the bridge body demolition area is divided into a primary demolition area of ​​the bridge body and a secondary demolition area of ​​the bridge body, the coal step is located below the bridge body demolition area, the coal step is for compressing coal for the bridge body, and the coal step is divided into a primary coal mining area of ​​the coal step and a secondary coal mining area of ​​the coal step; the method for rapid demolition and compressed coal recovery of the intermediate bridge is provided. The recovery method includes: destroying and throwing materials in the primary demolition area of ​​the bridge body by throwing blasting, and processing the remaining blast piles and separate processing volume in the primary demolition area of ​​the bridge body after the throwing blasting; mining the primary mining area of ​​the coal step to mine the coal in the primary mining area of ​​the coal step; destroying and throwing materials in the secondary demolition area of ​​the bridge body by throwing blasting, and processing the remaining blast piles and separate processing volume in the secondary demolition area of ​​the bridge body after the throwing blasting; mining the secondary mining area of ​​the coal step to mine the coal in the secondary mining area of ​​the coal step.

[0005] According to the method for rapid dismantling and compressed coal recovery of the intermediate bridge based on throwing blasting of the embodiment of the present invention, the bridge body dismantling area is divided into the bridge body primary dismantling area and the bridge body secondary dismantling area, and the coal step is divided into the coal step primary coal mining area and the coal step secondary coal mining area. First, the bridge body primary dismantling area is dismantled, and then the coal step primary coal mining area is mined, and then the bridge body secondary dismantling area is dismantled, and finally the coal step secondary coal mining area is mined. Therefore, the method achieves the purpose of dispersing the materials in the bridge body dismantling area by adopting the method of throwing blasting to crush and throw the materials in the bridge body dismantling area. On the one hand, the materials at the intermediate bridge position and the goaf position can be stripped at the same time, shortening the bridge body dismantling time and advancing the bridge body penetration; on the other hand, the vast space of the goaf is fully combined with the storage of the secondary stripping materials, reducing the secondary stripping workload in the bridge body dismantling area and saving the secondary stripping cost.

[0006] In addition, the method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to the above embodiment of the present invention may also have the following additional technical features:

[0007] According to one embodiment of the present invention, a single bucket-truck process is used to process the remaining blast piles and separate processing volumes in the primary demolition area of ​​the bridge body and the secondary demolition area of ​​the bridge body after the throwing blasting.

[0008] According to one embodiment of the present invention, a single-bucket-truck process is used to process the remaining explosive piles and separate processing volumes in the primary demolition area and the secondary demolition area of ​​the bridge body after throw blasting, including: using a single-bucket excavator to load and a truck to transport the remaining explosive piles and separate processing volumes in the primary demolition area and the secondary demolition area of ​​the bridge body after throw blasting to the inner spoil yard for disposal.

[0009] According to one embodiment of the present invention, the effective throwing amount in the primary demolition area of ​​the bridge body and the effective throwing amount in the secondary demolition area of ​​the bridge body after the throwing blasting are temporarily stored in the goaf.

[0010] According to one embodiment of the present invention, the boundary between the intermediate bridge retaining area and the bridge body removal area is determined according to the natural repose angle of the intermediate bridge material during the secondary peeling.

[0011] According to one embodiment of the present invention, when drilling holes for cast blasting and installing blasting charges, the inclination angle of the blasthole for cast blasting follows the principle of being consistent with the step slope angle and the principle of the line of least resistance.

[0012] According to one embodiment of the present invention, when performing throwing blasting, the throwing direction of the material is the direction of the goaf on both sides of the middle bridge.

[0013] According to one embodiment of the present invention, the boundary between the primary bridge demolition area and the secondary bridge demolition area is determined according to the natural repose angle of the materials in the bridge demolition area.

[0014] According to one embodiment of the present invention, the coal step is divided into a primary coal mining area of ​​the coal step and a secondary coal mining area of ​​the coal step according to the order in which coal is exposed in the coal step.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a method for rapid dismantling of an intermediate bridge and compressed coal recovery based on throwing blasting according to an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of a bridge body removal area of ​​an intermediate bridge according to an embodiment of the present invention;

[0018] Figure 3 A top view of the bridge body and the coal step when the middle bridge is through according to an embodiment of the present invention;

[0019] Figure 4 A top view of a bridge body and a coal step when they are about to be demolished according to an embodiment of the present invention;

[0020] Figure 5 A top view of a bridge body and a coal step after the bridge body is removed at one time according to an embodiment of the present invention;

[0021] Figure 6 A top view of a bridge body and a coal step after one-time coal mining according to an embodiment of the present invention;

[0022] Figure 7 A top view of the bridge body and coal steps after the secondary dismantling of the bridge body according to one embodiment of the present invention;

[0023] Figure 8 A front view showing the division of bridge body demolition areas according to one embodiment of the present invention;

[0024] Fig. 9 It is a front view of a bridge body according to an embodiment of the present invention after being dismantled in one step;

[0025] Fig.10 It is a front view of a bridge body after secondary dismantling according to an embodiment of the present invention;

[0026] Fig.11 It is a schematic diagram of a primary demolition area of ​​a bridge body after throwing blasting according to an embodiment of the present invention;

[0027] Fig.12 It is a schematic diagram of the secondary demolition area of ​​the bridge body after the throwing blasting according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1. Inner dumping ground; 2. Middle bridge reserved area;

[0030] 3. Bridge body demolition area; 31. Bridge body primary demolition area; 32. Bridge body secondary demolition area;

[0031] 4. Coal step; 41. Coal step primary coal mining area; 42. Coal step secondary coal mining area;

[0032] 5. Top line of the upper coal step slope; 6. Bottom line of the upper coal step slope; 7. Top line of the lower coal step slope; 8. Bottom line of the lower coal step slope; 9. Top line of the middle bridge slope; 10. Bottom line of the middle bridge pit bottom slope; 11. Middle bridge transport platform; 12. Bottom line of the middle bridge slope of the upper coal step; 13. Boundary line of the coal step;

[0033] 141. Effective throwing volume of the bridge body in the primary demolition area after throwing blasting; 142. Effective throwing volume of the bridge body in the secondary demolition area after throwing blasting;

[0034] 151. The separate processing volume of the first demolition area of ​​the bridge body after the throwing blasting; 152. The separate processing volume of the second demolition area of ​​the bridge body after the throwing blasting. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] The following describes a method for rapid dismantling of an intermediate bridge and compressed coal recovery based on cast blasting according to an embodiment of the present invention with reference to the accompanying drawings.

[0037] Figure 1 The present invention is a flowchart of a method for rapid dismantling of an intermediate bridge and compressed coal recovery based on cast blasting according to an embodiment of the present invention.

[0038] In one embodiment of the present invention, Figures 2 to 12As shown, the middle bridge includes a middle bridge retention area 2 and a bridge body demolition area 3. One side of the middle bridge retention area 2 is connected to the inner spoil dump 1, and one side of the bridge body demolition area 3 is connected to a coal step 4. The bridge body demolition area 3 is divided into a bridge body primary demolition area 31 and a bridge body secondary demolition area 32. The coal step 4 is located below the bridge body demolition area 3. The coal step 4 is used to press coal for the bridge body. The coal step 4 is divided into a coal step primary coal mining area 41 and a coal step secondary coal mining area 42.

[0039] Specifically, the intermediate bridge refers to a bridge body that connects the mining area and the inner spoil dump 1 for transportation in order to shorten the transportation distance. The intermediate bridge is a dynamic bridge, and its constituent materials are stripping materials from the open-pit mine in the early stage of bridge use, and unmined coal in the later stage. The starting point is the beginning of the bridge use until the bridge body material becomes coal. Figure 2 As shown, from left to right are the inner spoil dump 1, the middle bridge retention area 2, the bridge body demolition area 3 and the coal step 4. In the embodiment of the present invention, the bridge body demolition area 3 is divided into a bridge body primary demolition area 31 and a bridge body secondary demolition area 32, so that the bridge body demolition area 3 is divided into two demolitions; the coal step 4 is divided into a coal step primary coal mining area 41 and a coal step secondary coal mining area 42, so that the coal at the coal step 4 is mined out twice.

[0040] like Figure 1 As shown, the method for rapid dismantling of the intermediate bridge and compressed coal recovery based on blasting according to the embodiment of the present invention may include the following steps:

[0041] S1, destroying and throwing materials in the bridge body primary demolition area 31 by throwing blasting, and processing the remaining blast pile and separate processing volume in the bridge body primary demolition area 31 after throwing blasting.

[0042] S2, mining the primary mining area 41 of the coal step to mine the coal in the primary mining area 41 of the coal step.

[0043] S3, destroying and throwing the materials in the secondary demolition area 32 of the bridge body by throwing blasting, and processing the remaining blast pile and the separate processing volume in the secondary demolition area 32 of the bridge body after the throwing blasting.

[0044] S4, mining the coal step secondary mining area 42 to mine the coal in the coal step secondary mining area 42.

[0045] Specifically, the throwing blasting technology refers to the use of explosive blasting energy to break the rock and throw a portion of the stripping material into the goaf, which greatly reduces the operating cost of the stripping equipment. After the throwing blasting is adopted, the height of the stripping step is reduced. For example, the original 30m high step is partially reduced after the blasting, and only a step of about 20m in height remains. The demolition process of the middle bridge is actually the process of recovering the coal compressed by the bridge body. During the demolition process, according to the equipment layout requirements, it is necessary to first clean the rocks at the junction of the coal and rock of the bridge body. Since this part of the rock is piled up with stripping materials during the construction of the bridge body, cleaning the rocks there is also called secondary stripping; after the secondary stripping, the recovery of the coal compressed by the bridge body begins.

[0046] Specifically, first, the throw blasting technology is used to blast the bridge body primary demolition area 31, and the bridge body primary demolition area 31 is destroyed and thrown into the designated area (goaf area) by controlling the blasting energy and direction; after the blasting, the remaining blast pile (i.e., the materials accumulated after the blasting) and the amount that needs to be processed separately (which may refer to some large pieces of materials or special areas, etc.) in the bridge body primary demolition area 31 are cleaned and transported by a single bucket-truck process, and these materials are transported to the inner dump 1 for processing, such as Figure 5 , 9 and 11.

[0047] After the bridge body primary demolition area 31 is cleared, the coal step primary mining area 41 is mined using equipment such as an excavator or a coal mining machine according to normal mining procedures and working parameters, and the mined coal is transported to a designated location by truck until the coal step primary mining area 41 is mined. Figure 6 shown.

[0048] The secondary demolition area 32 of the bridge body is blasted by using the throwing blasting technology. By controlling the blasting energy and direction, the secondary demolition area 32 of the bridge body is destroyed and thrown into the goaf. After the blasting, the remaining blast piles and separate processing volumes in the secondary demolition area 32 of the bridge body are cleaned and transported by using the single bucket-truck process, and these materials are transported to the inner dump 1 for processing, such as Figure 7 , 10 and 12.

[0049] After the secondary demolition area 32 of the bridge body is cleared, the coal step secondary mining area 42 is mined using equipment such as excavators or coal mining machines according to normal coal mining procedures and working parameters, and the mined coal is transported to a designated location by truck until the coal step secondary mining area 42 is mined and the coal step 4 is completely mined, thereby completing compressed coal recovery.

[0050] It should be understood that the demolition of the adjacent middle bridge means that there is a coal step 4 below the bridge demolition area 3. When the coal mining operation reaches the bottom line 10 of the middle bridge pit bottom slope, it is difficult to mine the coal step 4 below the bridge body, and the middle bridge body begins to face the problem of demolition. Figure 4 shown.

[0051] It should be noted that, for ease of understanding, in the present invention Figures 2 to 6 The top view shows the upper coal step slope top line 5, upper coal step slope bottom line 6, lower coal step slope top line 7, lower coal step slope bottom line 8, middle bridge slope top line 9, middle bridge pit bottom line 10, middle bridge transport platform 11, upper coal step middle bridge slope bottom line 12, and coal step boundary line 13.

[0052] Therefore, the method for rapid demolition of the intermediate bridge and compressed coal recovery based on throwing blasting in the embodiment of the present invention adopts the method of throwing blasting to crush and throw the materials in the bridge demolition area 3, of which about 1 / 3 is transferred to the goaf on both sides of the intermediate bridge, so as to achieve the purpose of dispersing the materials in the bridge demolition area 3. On the one hand, by increasing the number of mining and loading equipment working at the same time, the materials at the intermediate bridge position and the goaf position can be stripped at the same time, so as to give full play to the efficiency of secondary stripping, shorten the bridge demolition time, advance the bridge penetration, and ensure the function of the intermediate bridge as a transportation channel connecting the mining area and the internal spoil dump 1; on the other hand, by giving full play to the function of the goaf for temporary or long-term storage of materials, the vast space of the goaf is fully combined with the storage of secondary stripping materials, and most of the materials far away from the coal step 4 after throwing are left in the goaf, and only a small part of the materials that are still pressing on the slope foot after throwing are stripped, so as to reduce the secondary stripping workload in the bridge demolition area 3 and save the secondary stripping cost.

[0053] According to one embodiment of the present invention, a single bucket-truck process is used to process the remaining blast piles and separate processing volume in the bridge body primary demolition area 31 and the bridge body secondary demolition area 32 after the throwing blasting. The distribution of the separate processing volume 151 in the bridge body primary demolition area after the throwing blasting is as follows: Fig.11 As shown in the figure, the distribution of the single processing volume 152 in the secondary demolition area of ​​the bridge body after the blasting is as follows Fig.12 shown.

[0054] Furthermore, according to one embodiment of the present invention, a single bucket-truck process is used to process the remaining explosive piles and separate processing volumes in the primary demolition area 31 and the secondary demolition area 32 of the bridge body after the throwing blasting, including: using a single bucket excavator for loading and a truck for transportation to transport the remaining explosive piles and separate processing volumes in the primary demolition area 31 and the secondary demolition area 32 of the bridge body after the throwing blasting to the inner spoil yard 1 for disposal.

[0055] Specifically, the single-bucket-truck process refers to the use of a single-bucket excavator to collect and load materials and a truck to transport materials during the mining work of an open-pit coal mine, which can cope with different terrain and material conditions. A single-bucket excavator is used to collect and load the primary demolition area 31 of the bridge body and the secondary demolition area 32 of the bridge body after the throwing blasting. The bucket of the excavator is inserted into the remaining blasting pile to load the gravel, earth or other materials produced by the blasting into the bucket. For larger stones or irregularly shaped materials, the individual processing volume is further crushed or decomposed to ensure that it can be effectively loaded onto the truck. After loading is completed, the truck will drive next to the excavator, and the excavator will unload the materials in the bucket into the truck's cargo box. The truck then drives to the designated internal dumping site 1 to discard the materials.

[0056] According to one embodiment of the present invention, the effective throwing amount in the primary demolition area 31 of the bridge body and the effective throwing amount in the secondary demolition area 32 of the bridge body after the throwing blasting are temporarily stored in the goaf.

[0057] Specifically, the distribution of the effective throwing amount 141 in the bridge body demolition area after throwing blasting is as follows: Fig.11 As shown in the figure, the distribution of the effective throwing amount 142 in the secondary demolition area of ​​the bridge body after throwing blasting is as follows Fig.12 As shown. The open pit has a large area of ​​goaf at the bottom, which can be used to store materials temporarily or for a long time. Therefore, the vast space of the goaf is effectively integrated with the transfer of secondary stripping materials. The materials at the middle bridge position and the goaf position are stripped at the same time, which can improve the efficiency of secondary stripping material collection and loading and shorten the time of middle bridge removal; the materials far away from the step position are stored in the goaf to reduce the workload of stripping.

[0058] According to one embodiment of the present invention, the boundary between the middle bridge retaining area 2 and the bridge body removal area 3 is determined according to the natural repose angle of the middle bridge material during the secondary peeling.

[0059] Specifically, the middle bridge retention area 2 refers to the part that still needs to be retained during the secondary stripping, while the bridge body demolition area 3 is the part that needs to be demolished. The dividing line between these two areas is very important because it determines which materials need to be removed and which can be retained. The natural angle of repose, also known as the natural angle of repose or internal friction angle, refers to the maximum stable angle formed by the natural accumulation of materials without the action of external forces. When the material is piled to a certain height, due to its own gravity and internal friction, a stable angle that will no longer collapse on its own will be formed. This angle is the natural angle of repose. Materials of different materials have different natural angles of repose. For example, the natural angle of repose of dry sand is approximately between 30-35 degrees.

[0060] When determining the boundary between the middle bridge retention area 2 and the bridge body demolition area 3, the significance of considering the natural repose angle is as follows: Stability: The materials in the middle bridge retention area 2 need to have sufficient stability to support the upper structure and vehicle traffic, and the natural repose angle can help determine the maximum safe angle for material stacking; Economy: By reasonably determining the boundary line, unnecessary material movement can be reduced and mining costs can be lowered; Safety: Avoid landslides or other safety accidents that may be caused by excessive stripping or improper material stacking; Resource recovery: Ensure that during the demolition process, valuable coal resources can be recovered to the maximum extent possible, while waste materials are properly disposed of.

[0061] According to one embodiment of the present invention, when drilling holes for cast blasting and installing blasting charges, the inclination angle of the blasthole for cast blasting follows the principle of being consistent with the step slope angle and the principle of the line of least resistance.

[0062] Specifically, the step slope angle refers to the angle between the step slope and the horizontal plane, which is usually between 65° and 70°. In throw blasting, the blast hole inclination should be consistent with the step slope angle to ensure that the blasting force can effectively throw the rock to the intended area. Doing so can maximize the use of blasting energy, achieve effective rock throwing, and reduce damage to the surrounding environment.

[0063] The resistance line refers to the shortest distance from the bottom of the blasthole to the free surface (i.e. the surface where the rock can move freely after blasting). In throw blasting, the principle of the minimum resistance line states that the explosives in the blasthole should be placed where the resistance line is the smallest, so that the blasting energy can act more concentratedly on the rock, thereby improving the blasting efficiency. By optimizing the position and depth of the explosive pack, the effective transfer of blasting energy and the smooth throwing of the rock can be ensured.

[0064] In actual operation, these two principles usually need to be considered in combination. The setting of the blasthole inclination angle should take into account both the step slope angle to ensure the effective use of blasting energy and the minimum resistance line to improve the efficiency and effect of blasting. Such a design can ensure the safety and economy of blasting operations while minimizing the impact on the environment. It should be noted that when carrying out blasting operations, it is also necessary to comply with relevant safety regulations and standards, such as the provisions of the "Safety Regulations for Blasting" (GB6722-2011), to ensure the safety of blasting operations.

[0065] According to one embodiment of the present invention, when performing throwing blasting, the throwing direction of the material is the direction of the goaf on both sides of the middle bridge.

[0066] Specifically, when carrying out throwing blasting operations, by reasonably designing the throwing distance, direction and material distribution, the blasted materials can fall into the goaf as expected, thereby effectively utilizing the existing space and reducing the occupation of new land; and can reduce the impact on the surrounding environment, reduce the potential risks of blasting operations to the surrounding environment and personnel safety, and improve the safety of blasting; materials thrown into the goaf can be subsequently recycled and processed, such as recycling waste rock or using it as filling material, thereby reducing mining costs and helping to reduce damage to the natural environment, meeting environmental protection requirements.

[0067] According to one embodiment of the present invention, the boundary between the primary bridge demolition area 31 and the secondary bridge demolition area 32 is determined according to the natural repose angle of the material in the bridge demolition area 3 .

[0068] Specifically, the boundary between the first demolition area 31 of the bridge body and the second demolition area 32 of the bridge body needs to be determined based on the natural repose angle of the material and combined with blasting design principles and safety regulations. This can not only ensure the safety of the demolition process, but also improve the demolition efficiency and economic benefits.

[0069] According to one embodiment of the present invention, the coal step 4 is divided into a coal step primary coal mining area 41 and a coal step secondary coal mining area 42 according to the order in which coal is exposed in the coal step 4 .

[0070] In summary, according to the method for rapid dismantling and compressed coal recovery of the intermediate bridge based on throwing blasting in the embodiment of the present invention, the bridge body dismantling area is divided into the primary dismantling area of ​​the bridge body and the secondary dismantling area of ​​the bridge body, and the coal step is divided into the primary coal mining area of ​​the coal step and the secondary coal mining area of ​​the coal step. First, the primary dismantling area of ​​the bridge body is dismantled, and then the primary coal mining area of ​​the coal step is mined, and then the secondary dismantling area of ​​the bridge body is dismantled, and finally the secondary coal mining area of ​​the coal step is mined. Therefore, the method achieves the purpose of dispersing the materials in the bridge body dismantling area by adopting the method of throwing blasting to crush and throw the materials in the bridge body dismantling area. On the one hand, the materials at the intermediate bridge position and the goaf position can be stripped at the same time, shortening the bridge body dismantling time and advancing the bridge body penetration; on the other hand, the vast space of the goaf is fully combined with the storage of the secondary stripping materials, reducing the secondary stripping workload in the bridge body dismantling area and saving the secondary stripping cost.

[0071] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0072] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for rapid dismantling of an intermediate bridge and compressed coal recovery based on blasting, characterized in that: The intermediate bridge includes an intermediate bridge reserved area and a bridge body demolition area. One side of the intermediate bridge reserved area is connected to the inner spoil dump, and one side of the bridge body demolition area is connected to the coal step. The bridge body demolition area is divided into a bridge body primary demolition area and a bridge body secondary demolition area. The coal step is located below the bridge body demolition area. The coal step is used to press coal for the bridge body. The coal step is divided into a coal step primary coal mining area and a coal step secondary coal mining area. The method for rapid removal of the intermediate bridge and compressed coal recovery comprises: The materials in the bridge body primary demolition area are destroyed and thrown by throwing blasting, and the remaining blast piles and separate processing quantities in the bridge body primary demolition area after throwing blasting are processed; Mining the primary coal mining area of ​​the coal step to mine the coal in the primary coal mining area of ​​the coal step; The materials in the secondary demolition area of ​​the bridge body are destroyed and thrown by throwing blasting, and the remaining blast piles and separate processing quantities in the secondary demolition area of ​​the bridge body after throwing blasting are processed; The secondary mining area of ​​the coal step is mined to mine the coal in the secondary mining area of ​​the coal step.

2. The method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to claim 1 is characterized in that: The single bucket-truck process is used to process the remaining blast piles and separate processing volumes in the primary demolition area of ​​the bridge body and the secondary demolition area of ​​the bridge body after the throwing blasting.

3. The method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to claim 2 is characterized in that: The single bucket-truck process is used to process the remaining explosive piles and separate processing volumes in the primary demolition area and the secondary demolition area of ​​the bridge body after the throw blasting, including: using a single bucket excavator to load and a truck to transport the remaining explosive piles and separate processing volumes in the primary demolition area and the secondary demolition area of ​​the bridge body after the throw blasting to the inner spoil yard for disposal.

4. The method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to claim 1 is characterized in that: The effective throwing volume in the first demolition area of ​​the bridge body and the effective throwing volume in the second demolition area of ​​the bridge body after the throwing blasting are temporarily stored in the goaf.

5. The method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to claim 1 is characterized in that: The boundary between the intermediate bridge retaining area and the bridge body removal area is determined according to the natural repose angle of the intermediate bridge material during the secondary peeling.

6. The method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to claim 1 is characterized in that: When drilling holes and installing blasting charges for throw blasting, the inclination angle of the blasthole for throw blasting follows the principle of consistency with the step slope angle and the principle of the minimum resistance line.

7. The method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to claim 1 is characterized in that: When throwing blasting is carried out, the throwing direction of the material is the direction of the goaf on both sides of the middle bridge.

8. The method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to claim 1 is characterized in that: The boundary between the primary demolition area of ​​the bridge body and the secondary demolition area of ​​the bridge body is determined according to the natural repose angle of the materials in the bridge body demolition area.

9. The method for rapid dismantling of the intermediate bridge and compressed coal recovery based on throwing blasting according to claim 1 is characterized in that: The coal step is divided into a primary coal mining area and a secondary coal mining area according to the order in which coal is exposed in the coal step.

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