Method for rapid dismantling and coal recovery of intermediate bridge based on throwing blasting

Abstract

The application discloses a method for quickly demolishing an intermediate bridge and recovering coal based on throwing blasting, divides a bridge body demolition area into a bridge body first demolition area and a bridge body second demolition area, divides a coal bench into a coal bench first mining area and a coal bench second mining area, carries out the first step of bridge body first demolition, the second step of first mining, the third step of bridge body second demolition, and the fourth step of second mining.The method disperses the materials in the bridge body demolition area by adopting the method of throwing blasting to break and throw the materials in the bridge body demolition area, achieves the purpose of dispersing the materials in the bridge body demolition area, can strip the materials in the position of the intermediate bridge and the position of the goaf at the same time, shortens the bridge body demolition time, and advances the bridge body penetration; on the other hand, fully combines the wide space of the goaf with the storage of the second stripping materials, reduces the second stripping workload of the bridge body demolition area, and saves the second stripping cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of open-pit coal mining, and in particular to a method for rapid removal of an intermediate bridge based on throw blasting and recovery of coal. BACKGROUND

[0002] In related technologies, when the coal mining operation reaches the position of the intermediate bridge, in order to mine the coal under the bridge body, the intermediate bridge body begins to face the problem of removal. The existing secondary stripping mainly consists of two parts of perforation blasting and descending section mining. During construction, in order to ensure safety, perforation blasting is first performed at the coal-rock boundary to prepare for secondary stripping, then a front-loading machine or a bulldozer is used for descending section operation, and then the secondary stripping material is completely mined and loaded until the original coal bench is completely exposed. However, using this method to remove the bridge body, the number of mining and loading equipment working simultaneously is limited, which cannot fully utilize the efficiency of secondary stripping, resulting in a long bridge body removal time, a delay in the bridge body penetration, and an impact on the function of the intermediate bridge as a transport channel connecting the mining field and the internal dump. Moreover, the material above the original coal bench needs to be completely mined, and the secondary stripping workload is large. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in related technologies. To this end, the first object of the present application is to propose a method for rapid removal of an intermediate bridge based on throw blasting and recovery of coal, which can solve the problems of large secondary stripping workload and low intermediate bridge removal efficiency, reduce the secondary stripping workload, shorten the intermediate bridge removal time, speed up the intermediate bridge penetration, and protect the function of the intermediate bridge as a transport channel connecting the mining field and the internal dump.

[0004] To achieve the above-mentioned object, the first aspect of the present application proposes a method for rapid removal of an intermediate bridge based on throw blasting and recovery of coal, the intermediate bridge comprising an intermediate bridge reserved area and a bridge body removal area, one side of the intermediate bridge reserved area being connected to an internal dump, one side of the bridge body removal area being connected to a coal bench, the bridge body removal area being divided into a bridge body primary removal area and a bridge body secondary removal area, the coal bench being located below the bridge body removal area, the coal bench being coal under the bridge body, the coal bench being divided into a coal bench primary mining area and a coal bench secondary mining area; the method for rapid removal of the intermediate bridge based on throw blasting and recovery of coal comprising: using a throw blasting method to damage and throw the material in the bridge body primary removal area, and processing the remaining blast pile and the separate processing amount after throw blasting; mining the coal bench primary mining area to mine the coal in the coal bench primary mining area; using a throw blasting method to damage and throw the material in the bridge body secondary removal area, and processing the remaining blast pile and the separate processing amount after throw blasting; mining the coal bench secondary mining area to mine the coal in the coal bench secondary mining area.

[0005] The method for quickly demolishing an intermediate bridge and recovering coal based on throwing blasting according to the embodiment of the present application divides the bridge body demolition area into a bridge body first demolition area and a bridge body second demolition area, divides the coal bench into a coal bench first mining area and a coal bench second mining area, first demolishes the bridge body first demolition area, then mines the coal bench first mining area, then demolishes the bridge body second demolition area, and finally mines the coal bench second mining area. Thus, the method breaks and throws the materials in the bridge body demolition area by using the throwing blasting method, so as to disperse the materials in the bridge body demolition area. On the one hand, the materials in the position of the intermediate bridge and the position of the goaf can be stripped at the same time, so as to shorten the bridge body demolition time and advance the bridge body penetration. On the other hand, the wide space of the goaf is fully combined with the storage of the second stripping materials, so as to reduce the second stripping workload of the bridge body demolition area and save the second stripping cost.

[0006] In addition, the method for quickly demolishing an intermediate bridge and recovering coal based on throwing blasting according to the above embodiment of the present application can have the following additional technical features:

[0007] According to one embodiment of the present application, the single-bucket-truck process is used to process the residual blasting piles and the separate processing amount of the bridge body first demolition area and the bridge body second demolition area after the throwing blasting.

[0008] According to one embodiment of the present application, the single-bucket-truck process is used to process the residual blasting piles and the separate processing amount of the bridge body first demolition area and the bridge body second demolition area after the throwing blasting, including: using the single-bucket excavator and truck transportation to transport the residual blasting piles and the separate processing amount of the bridge body first demolition area and the bridge body second demolition area after the throwing blasting to the internal dump site for dumping.

[0009] According to one embodiment of the present application, the effective throwing amount in the bridge body first demolition area and the effective throwing amount in the bridge body second demolition area after the throwing blasting are temporarily stored in the goaf.

[0010] According to one embodiment of the present application, the boundary between the intermediate bridge reserved area and the bridge body demolition area is determined according to the natural repose angle of the intermediate bridge materials during the second stripping.

[0011] According to one embodiment of the present application, when the drilling and the installation of the blasting charge for the throwing blasting are performed, the inclination angle of the blast hole for the throwing blasting follows the principle of being consistent with the bench slope angle and the principle of the minimum resistance line.

[0012] According to one embodiment of the present application, when the throwing blasting is performed, the throwing direction of the materials is the direction of the goaf on both sides of the intermediate bridge.

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

[0014] According to one embodiment of the present application, the coal bench is divided into the primary coal mining area and the secondary coal mining area according to the sequence of exposing the coal in the coal bench.

[0015] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Flow chart of the method for rapid removal of the intermediate bridge and coal recovery based on the throw blasting according to an embodiment of the present application;

[0017] Figure 2 Schematic diagram of the bridge removal area of the intermediate bridge according to one embodiment of the present application;

[0018] Figure 3 Top view of the bridge and the coal bench when the intermediate bridge is penetrated according to one embodiment of the present application;

[0019] Figure 4 Top view of the bridge and the coal bench when the intermediate bridge is removed according to one embodiment of the present application;

[0020] Figure 5 Top view of the bridge and the coal bench when the primary bridge removal is completed according to one embodiment of the present application;

[0021] Figure 6 Top view of the bridge and the coal bench when the primary coal mining is completed according to one embodiment of the present application;

[0022] Figure 7 Top view of the bridge and the coal bench when the secondary bridge removal is completed according to one embodiment of the present application;

[0023] Figure 8 Front view of the division of the bridge removal area according to one embodiment of the present application;

[0024] Figure 9 Front view of the primary bridge removal completed according to one embodiment of the present application;

[0025] Figure 10 Front view of the secondary bridge removal completed according to one embodiment of the present application;

[0026] Figure 11 Schematic diagram of the primary bridge removal area after the throw blasting according to one embodiment of the present application;

[0027] Figure 12 Fig. 2 is a schematic view of a secondary demolition area of a bridge body after a throw blasting according to an embodiment of the present application.

[0028] Reference signs:

[0029] 1, inner dump; 2, middle bridge reserved area;

[0030] 3, bridge body demolition area; 31, primary demolition area of bridge body; 32, secondary demolition area of bridge body;

[0031] 4, coal bench; 41, primary coal mining area of coal bench; 42, secondary coal mining area of coal bench;

[0032] 5, upper coal bench top line; 6, upper coal bench bottom line; 7, lower coal bench top line; 8, lower coal bench bottom line; 9, middle bridge top line; 10, middle bridge pit bottom line; 11, middle bridge transport platform; 12, middle bridge bottom line of upper coal bench; 13, coal bench boundary line;

[0033] 141, effective throw amount of primary demolition area of bridge body after throw blasting; 142, effective throw amount of secondary demolition area of bridge body after throw blasting;

[0034] 151, separate processing amount of primary demolition area of bridge body after throw blasting; 152, separate processing amount of secondary demolition area of bridge body after throw blasting. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0036] A method for rapid demolition of a middle bridge and recovery of coal based on throw blasting is proposed in the embodiments of the present application, which is described below with reference to the accompanying drawings.

[0037] Figure 1 Fig. 1 is a flowchart of a method for rapid demolition of a middle bridge and recovery of coal based on throw blasting according to an embodiment of the present application.

[0038] In an embodiment of the present application, as shown in Fig. 1, the method for rapid demolition of a middle bridge and recovery of coal based on throw blasting comprises the following steps. Figures 2 to 12As shown, the intermediate bridge includes an intermediate bridge reserved area 2 and a bridge body removal area 3, one side of the intermediate bridge reserved area 2 is connected with the inner dump 1, one side of the bridge body removal area 3 is connected with the coal bench 4, the bridge body removal area 3 is divided into a bridge body first removal area 31 and a bridge body second removal area 32, the coal bench 4 is located below the bridge body removal area 3, the coal bench 4 is for bridge body coal, and the coal bench 4 is divided into a coal bench first mining area 41 and a coal bench second mining area 42.

[0039] Specifically, the intermediate bridge refers to a bridge body constructed to connect the mining area and the inner dump 1 for transportation to shorten the transportation distance. The intermediate bridge is a dynamic bridge, and the constituent material is the stripping material of the open-pit mine at the initial stage of bridge use, and is the unexplored coal in the later stage. From the start of bridge use as the starting point, until the position where the bridge body material changes to coal. Figure 2 As shown, from left to right, they are the inner dump 1, the intermediate bridge reserved area 2, the bridge body removal area 3 and the coal bench 4. In the embodiment of the present application, the bridge body removal area 3 is divided into a bridge body first removal area 31 and a bridge body second removal area 32 to divide the bridge body removal area 3 into two removals; and the coal bench 4 is divided into a coal bench first mining area 41 and a coal bench second mining area 42 to divide the coal in the coal bench 4 into two mining.

[0040] As shown, Figure 1 The intermediate bridge rapid removal and coal recovery method based on throwing blasting in the embodiment of the present application can include the following steps:

[0041] S1, the material in the bridge body first removal area 31 is damaged and thrown by using the throwing blasting mode, and the remaining blast pile and separate processing amount of the bridge body first removal area 31 after throwing blasting are processed.

[0042] S2, the coal in the coal bench first mining area 41 is mined to be mined out.

[0043] S3, the material in the bridge body second removal area 32 is damaged and thrown by using the throwing blasting mode, and the remaining blast pile and separate processing amount of the bridge body second removal area 32 after throwing blasting are processed.

[0044] S4, the coal in the coal bench second mining area 42 is mined to be mined out.

[0045] Specifically, the throw blasting technique refers to using the blasting energy of explosives to break the rock and throw a part of the stripped material to the goaf, thereby greatly reducing the operation cost of stripping equipment. After adopting the throw blasting, the stripping bench height is reduced, for example, the original 30m high bench is reduced in height after blasting, and only a bench with a height of about 20m remains. The process of removing the middle bridge is actually a process of recovering the coal under the bridge. During the removal process, the rock at the coal-rock interface of the bridge body needs to be cleaned first according to the equipment arrangement requirement. Since the rock at this part is piled up by the stripped material during the construction of the bridge body, the cleaning of the rock at this part is also called secondary stripping. After the secondary stripping, the recovery of the coal under the bridge is started.

[0046] Specifically, first, the throw blasting technique is used to blast the primary bridge removal area 31, and the primary bridge removal area 31 is destroyed and thrown to the designated area (goaf) by controlling the blasting energy and direction; after blasting, the remaining blast pile (i.e., the material accumulated after blasting) in the primary bridge removal area 31 and the amount that needs to be handled separately (which may refer to some large pieces of material or special areas, etc.) are cleaned and transported using the shovel-truck process, and the materials are transported to the internal dump 1 for treatment, as shown in Figs. Figure 5 、 9 and 11.

[0047] After the primary bridge removal area 31 is cleaned, the coal bench primary mining area 41 is mined using excavators or coal mining machines according to the normal coal mining procedures and working parameters, and the mined coal is transported to the designated location by trucks until the coal bench primary mining area 41 is completely mined, as shown in Fig. Figure 6 .

[0048] The throw blasting technique is used to blast the secondary bridge removal area 32, and the secondary bridge removal area 32 is destroyed and thrown to the goaf by controlling the blasting energy and direction; after blasting, the remaining blast pile in the secondary bridge removal area 32 and the amount that needs to be handled separately are cleaned and transported using the shovel-truck process, and the materials are transported to the internal dump 1 for treatment, as shown in Figs. Figure 7 、 10 and 12.

[0049] After the secondary bridge removal area 32 is cleaned, the coal bench secondary mining area 42 is mined using excavators or coal mining machines according to the normal coal mining procedures and working parameters, and the mined coal is transported to the designated location by trucks until the coal bench secondary mining area 42 is completely mined, and the coal bench 4 is completely mined, thereby completing the recovery of the coal under the bridge.

[0050] It needs to be understood that the near intermediate bridge demolition refers to that there is a coal bench 4 under the bridge body demolition area 3, when the mining operation reaches the position of the intermediate bridge pit bottom slope bottom line 10, the mined coal bench 4 under the bridge body encounters difficulties, and the intermediate bridge body begins to face the demolition problem, as shown in Figure 4

[0051] It needs to be pointed out that, in order to facilitate understanding, the upper coal bench slope top line 5, the upper coal bench slope bottom line 6, the lower coal bench slope top line 7, the lower coal bench slope bottom line 8, the intermediate bridge slope top line 9, the intermediate bridge pit bottom slope bottom line 10, the intermediate bridge transport platform 11, the upper coal bench intermediate bridge slope bottom line 12, and the coal bench boundary line 13 are marked in the top view of the Figures 2 to 6

[0052] Therefore, the intermediate bridge rapid demolition and coal recovery method based on the throwing blasting of the embodiment of the present application breaks and throws the materials in the bridge body demolition area 3 by using the throwing blasting method, about 1 / 3 of the materials are transferred into the goaf on both sides of the intermediate bridge, the purpose of dispersing the materials in the bridge body demolition area 3 is achieved, on the one hand, the number of simultaneously working mining and loading equipment can be increased to simultaneously strip the materials at the positions of the intermediate bridge and the goaf, the efficiency of the secondary stripping is fully utilized, the bridge body demolition time is shortened, the bridge body is penetrated in advance, and the function of the intermediate bridge as a transport channel connecting the mining area and the internal dump 1 is ensured; on the other hand, the function of the goaf for temporarily or long-term storing materials is utilized, the wide space of the goaf is fully combined with the storage of the secondary stripped materials, most of the materials far away from the coal bench 4 after the throwing are left in the goaf, only a small part of the materials still pressed on the slope foot after the throwing are stripped, the work amount of the secondary stripping in the bridge body demolition area 3 is reduced, and the secondary stripping cost is saved.

[0053] According to one embodiment of the present application, the single-bucket-truck process is used to process the remaining blasting piles and the separate processing amount of 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 amount 151 of the bridge body primary demolition area after the throwing blasting is as shown in Figure 11 The distribution of the separate processing amount 152 of the bridge body secondary demolition area after the throwing blasting is as shown in Figure 12

[0054] Further, according to one embodiment of the present application, the single-bucket-truck process is used to process the remaining blasting piles and the separate processing amount of the bridge body primary demolition area 31 and the bridge body secondary demolition area 32 after the throwing blasting, which includes: in the manner of single-bucket excavator mining and loading and truck transportation, the remaining blasting piles and the separate processing amount of the bridge body primary demolition area 31 and the bridge body secondary demolition area 32 after the throwing blasting are transported to the internal dump 1 for dumping.

[0055] ​​​Specifically, the single-bucket-truck process refers to the use of a single-bucket excavator for mining and loading and a truck for transporting materials in the mining operation of an open-pit coal mine, which can cope with different terrain and material conditions. The single-bucket excavator is used to perform mining and loading operations on the primary bridge removal area 31 and the secondary bridge removal area 32 after the throw blasting, the bucket of the excavator is inserted into the remaining blast pile to load the broken stones, earthwork or other materials generated by blasting into the bucket. For larger stones or irregularly shaped materials, further crushing or decomposition is performed on the individual processing amount to ensure that they can be effectively loaded onto the truck. After loading is completed, the truck will drive next to the excavator, the excavator will unload the materials in the bucket into the truck's cargo box, and the truck will then drive to the designated internal dump site 1 to dump the materials.

[0056] According to an embodiment of the present application, the effective throw amount in the primary bridge removal area 31 and the effective throw amount in the secondary bridge removal area 32 after throw blasting are temporarily stored in the goaf.

[0057] Specifically, the distribution of the effective throw amount 141 in the primary bridge removal area after throw blasting is as shown in Figure 11 , and the distribution of the effective throw amount 142 in the secondary bridge removal area after throw blasting is as shown in Figure 12 . The open-pit has a large goaf at the bottom, which has a wide space for temporarily or long-term storage of materials. Therefore, effectively integrating the wide space of the goaf with the transfer of the secondary stripping materials and stripping the materials at the intermediate bridge position and the goaf position at the same time can improve the efficiency of secondary stripping material mining and loading and shorten the intermediate bridge removal time; storing the materials away from the step position in the goaf can reduce the stripping workload.

[0058] According to an embodiment of the present application, the boundary between the intermediate bridge reserved area 2 and the bridge removal area 3 is determined according to the natural repose angle of the intermediate bridge materials during secondary stripping.

[0059] Specifically, the intermediate bridge reserved area 2 refers to the part that still needs to be reserved during secondary stripping, while the bridge removal area 3 refers to the part that needs to be removed, and the boundary between the two areas is very important because it determines which materials need to be removed and which can be reserved. The natural repose angle, 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 under the action of external forces. When the materials are piled up to a certain height, due to their own gravity and internal friction, a stable angle is formed that will not collapse on its own. This angle is the natural repose angle. Different materials have different natural repose angles, for example, the natural repose angle of dry sand is about 30-35 degrees.

[0060] The significance of considering the natural repose angle in determining the boundary between the intermediate bridge retention area 2 and the bridge removal area 3 lies in stability: the material in the intermediate bridge retention area 2 needs to have sufficient stability to support the structure above and vehicle traffic, and the natural repose angle can help determine the maximum safe angle of material stacking; economy: by reasonably determining the boundary, unnecessary material movement can be reduced, and mining costs can be lowered; safety: to avoid landslides or other safety incidents caused by excessive stripping or improper material stacking; resource recovery: to ensure that valuable coal resources can be maximally recovered during the removal process, while waste materials are reasonably disposed of.

[0061] According to an embodiment of the present application, when performing the installation work of the drill holes and blasting cartridges for the throw blasting, the inclination angle of the blast hole for the throw blasting follows the principle of consistent with the bench slope angle and the principle of minimum resistance line.

[0062] Specifically, the bench slope angle refers to the angle between the bench slope and the horizontal plane, which is usually between 65° and 70°. In throw blasting, the inclination angle of the blast hole should be consistent with the bench slope angle to ensure that the blasting power can effectively throw the rock to the intended area. This maximizes the use of blasting energy, achieves effective rock throwing, and reduces damage to the surrounding environment.

[0063] The resistance line refers to the shortest distance from the bottom of the blast hole to the free surface (i.e., the surface where the rock can move freely after blasting). In throw blasting, the principle of minimum resistance line states that the explosive in the blast hole should be placed in a way that minimizes the resistance line, so that the blasting energy can be more concentrated on the rock, thereby improving the blasting efficiency. By optimizing the position and depth of the cartridge, effective transmission of blasting energy and smooth throwing of rock can be ensured.

[0064] In actual operation, these two principles usually need to be considered together. The setting of the inclination angle of the blast hole needs to consider both the bench slope angle to ensure the effective use of blasting energy and the minimum resistance line to improve the efficiency and effectiveness of blasting. Such design can ensure the safety and economy of blasting operations, while minimizing the impact on the environment. It should be noted that when performing blasting operations, relevant safety regulations and standards, such as the provisions in the "Blasting Safety Regulations" (GB6722-2011), should be followed to ensure the safety of blasting operations.

[0065] According to an embodiment of the present application, when performing throw blasting, the throwing direction of the material is towards the goaf on both sides of the intermediate bridge.

[0066] Specifically, when the throwing blasting operation is performed, by reasonably designing the throwing distance, direction and distribution of the materials and the like, the materials after blasting can fall into the goaf as expected, so that the existing space can be effectively utilized, the occupation of new land can be reduced, the influence on the surrounding environment can be reduced, the potential risk of the blasting operation to the surrounding environment and personnel safety can be reduced, and the safety of the blasting can be improved; the materials thrown into the goaf can be recycled and processed subsequently, such as the recycling and utilization of waste rock or as a filling material, so that the mining cost can be reduced, the damage to the natural environment can be reduced, and the environmental protection requirement can be met.

[0067] According to an embodiment of the present application, the boundary between the primary bridge removal area 31 and the secondary bridge removal area 32 is determined according to the natural repose angle of the materials in the bridge removal area 3.

[0068] Specifically, the boundary between the primary bridge removal area 31 and the secondary bridge removal area 32 is determined based on the natural repose angle of the materials, and in combination with the blasting design principle and safety regulations, so that the safety of the removal process can be ensured, and the removal efficiency and economic benefits can be improved.

[0069] According to an embodiment of the present application, the coal bench 4 is divided into a primary coal mining area 41 and a secondary coal mining area 42 according to the sequence of the exposed coal in the coal bench 4.

[0070] In summary, according to the method for rapid removal of the intermediate bridge and recovery of the coal based on the throwing blasting according to the embodiments of the present application, the bridge removal area is divided into a primary bridge removal area and a secondary bridge removal area, the coal bench is divided into a primary coal mining area and a secondary coal mining area, the primary bridge removal area is removed first, then the primary coal mining area of the coal bench is mined, the secondary bridge removal area is removed, and finally the secondary coal mining area of the coal bench is mined. Therefore, the method can achieve the purpose of dispersing the materials in the bridge removal area by using the throwing blasting method to break and throw the materials in the bridge removal area, on the one hand, the materials in the intermediate bridge position and the goaf position can be stripped at the same time, the bridge removal time can be shortened, and the bridge penetration can be advanced; on the other hand, the wide space of the goaf and the storage of the secondary stripped materials can be fully combined, the secondary stripping workload of the bridge removal area can be reduced, and the secondary stripping cost can be saved.

[0071] It is to be appreciated that the above description and the examples that follow are intended to be illustrative only and that changes can be made to the description, as represented by the above listed elements, by the steps recited in the flow charts, and by the examples that follow, without departing from the spirit of the application. Accordingly, the scope of the present application is intended to be defined only by the appended claims.

[0072] It should be understood that aspects of the application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following techniques, which are well known in the art of hardware implementation, can be used: a hybrid of the above techniques, a mixture of two or more of the above techniques, or a combination of the above techniques with other techniques not listed above.

[0073] In the description of the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not intended to exclude that the terms in one place can refer to the same feature, structure, material, or characteristic as in another place, even if the above-mentioned terms are not explicitly used in one place. Furthermore, it is intended that the specific features, structures, materials, or characteristics described can be combined in any and all suitable ways.

[0074] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying a number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0075] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0076] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for rapid dismantling of intermediate bridges and recovery of compressed coal based on throwing blasting, characterized in that, The intermediate bridge includes an intermediate bridge preservation area and a bridge demolition area. One side of the intermediate bridge preservation area is connected to the inner spoil heap, and one side of the bridge demolition area is connected to the coal bench. The bridge demolition area is divided into a primary bridge demolition area and a secondary bridge demolition area. The coal bench is located below the bridge demolition area and serves as a coal-pressing structure for the bridge. The coal bench is divided into a primary coal mining area and a secondary coal mining area. The method for rapid dismantling of the intermediate bridge and recovery of compressed coal includes: The materials in the primary demolition area of ​​the bridge were destroyed and thrown using a throwing blasting method, and the remaining blast piles and separate disposal quantities in the primary demolition area of ​​the bridge were dealt with separately after the throwing blasting. The coal bench primary mining area is mined to extract the coal from the coal bench primary mining area; The materials in the secondary demolition area of ​​the bridge were destroyed and thrown by throwing blasting, and the remaining blast piles and separate disposal quantities in the secondary demolition area of ​​the bridge were dealt with separately after the throwing blasting. The secondary coal mining area of ​​the coal bench is mined to extract the coal from the secondary coal mining area of ​​the coal bench.

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

3. The method for rapid dismantling of intermediate bridges and recovery of compressed coal based on throwing blasting according to claim 2, characterized in that, The single-bucket-truck process for handling the remaining blast piles and individual disposal quantities in the primary and secondary demolition areas of the bridge after blasting includes: using a single-bucket excavator for loading and truck transportation to transport the remaining blast piles and individual disposal quantities in the primary and secondary demolition areas of the bridge after blasting to the internal spoil heap for disposal.

4. The method for rapid dismantling of intermediate bridges and recovery of compressed coal based on throwing blasting according to claim 1, characterized in that, The effective amount of explosives thrown into the primary demolition area of ​​the bridge body after the blasting and the effective amount of explosives thrown into the secondary demolition area of ​​the bridge body are temporarily stored in the goaf area.

5. The method for rapid dismantling of intermediate bridges and recovery of compressed coal based on throwing blasting according to claim 1, characterized in that, The boundary between the intermediate bridge retention area and the bridge demolition area is determined according to the natural angle of repose of the intermediate bridge material during the secondary stripping.

6. The method for rapid dismantling of intermediate bridges and recovery of compressed coal based on throwing blasting according to claim 1, characterized in that, When drilling and installing explosive charges for blasting, the borehole inclination angle should follow the principle of being consistent with the slope angle of the bench and the principle of minimum resistance.

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

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

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

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