Mine stope bottom filling reinforcement device and use method thereof

Abstract

This invention provides a reinforcement device for the bottom backfill in a mine stope and its usage method. The device includes an anchoring device installed within the failed backfill and a support structure installed within a pre-drilled working space at the bottom of the anchoring device. Anchor cables on the anchoring device are connected to the support structure, which has a groove structure within it. The installation of the anchoring device compacts the failed backfill, thus providing it with some support capacity. The support structure not only secures the connectors of the anchoring device but also partially encloses the failed backfill. Through the physical compression of the failed backfill by the anchoring device and the support between the support structure and the anchoring device, the failed backfill at the bottom of the mine stope is reinforced, restoring its support capacity and effectively supporting the overlying backfill and hanging wall ore, ensuring the safety of mining the backfill stope and the lower ore body.

Description

Technical Field

[0001] This invention relates to the field of mine backfill reinforcement technology, and in particular to a mine bottom backfill reinforcement device and its usage method. Background Technology

[0002] During underground mine backfilling, the strength of the backfill body is closely related to the mix proportions of the backfill materials and the quality of the cement. When the backfill material mix proportions are inappropriate or the quality is poor, the backfill body is prone to poor bonding, low strength, or even no strength. In such cases, the backfill body will fail and be unable to support the overlying backfill or ore in the stope, potentially leading to safety accidents. This is especially true when using layered backfilling methods for thick ore bodies. The effectiveness of the bottom layered backfill in the intermediate stope is crucial for the safe mining of the ore body, as the lower ore body will be mined under its direct protection. Its ability to support and stabilize the ore body directly affects the safety of mining the lower ore body. Therefore, backfill failure, especially the failure of the bottom layered backfill in the intermediate stope of thick ore bodies, becomes a major safety hazard when using backfilling methods in underground mines.

[0003] In view of this, it is necessary to design an improved reinforcement device for the bottom filling of a mine and its usage method to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a device for reinforcing the bottom filling material in a mine and its usage method.

[0005] To achieve the above-mentioned objectives, the present invention provides a reinforcement device for the bottom backfill of a mine, comprising an anchoring device disposed within the failed backfill and a support structure disposed within a pre-opened working space at the bottom of the anchoring device; the anchor cable on the anchoring device is connected to the support structure, the anchoring device is in a "V" shape after being stabilized, and the support structure has a groove structure inside.

[0006] Preferably, the anchoring device includes a first steel plate, a second steel plate, and a connector connecting the first steel plate and the second steel plate, and the first steel plate and the second steel plate are openable and closable.

[0007] Preferably, the first steel plate has a quadrilateral structure, and a first groove is provided on the wall surface of the first steel plate near the second steel plate. The second steel plate has a second groove at a corresponding position that can mate with the first groove. The first groove and the second groove mate to form a circular channel. The two opposite sides of the first steel plate are sharp pointed surfaces, and the connector is provided on one side of one of the pointed surfaces.

[0008] Preferably, the connector includes a hinge connecting the first steel plate and the second steel plate, and a connecting rod disposed on the hinge for sleeved anchor cable. The connecting rod includes a hinge rod and a hexagonal screw connected to each other. The hexagonal screw has a through hole for a collar for connecting the anchor cable to the connecting rod to pass through.

[0009] Preferably, the support structure consists of a first folded plate and a second folded plate, which are filled with filling slurry capable of forming a high-strength filling body and are joined together. The first folded plate is formed by a plurality of first plates and second plates arranged alternately. The length and width of the first folded plate do not exceed the length and width of the working space.

[0010] Preferably, the groove structure is composed of two adjacent first plates and a second plate located between the two first plates.

[0011] Preferably, the first plate has screw holes at both ends near the ends to connect the first folded plate and the second folded plate; one end edge of the second plate has a grouting hole for injecting the filling slurry into the support structure; the middle of the second plate also has two parallel circular holes for connecting the anchor cable to the support structure, and the diameter of the circular holes is not less than the diameter of the anchor cable.

[0012] Furthermore, the present invention also provides a method for using the aforementioned mine bottom backfill reinforcement device for reinforcing failed backfill, comprising the following steps:

[0013] S1. Near the transport channel of the intermediate mining area where the backfill material has failed, excavate a temporary storage chamber with a certain capacity for backfill waste.

[0014] S2. Enter the failed backfill at the bottom of the mining area from the existing intermediate mining area connecting roadway and excavate the working space for setting up the support structure.

[0015] S3. Anchoring devices are horizontally inserted into the failed backfill at the bottom of the stope from the working space. After being inserted to a certain depth, the anchor cables on the anchoring devices are pulled in the opposite direction. At the same time, a first folded plate is installed at the boundary of the backfill at the bottom of the stope in the working space, and the anchor cables are sequentially passed through two round holes on the first folded plate. After welding, the installation of the first folded plate is completed. Then, the second folded plate is combined and fixed together with the first folded plate cover. Next, backfill grout is injected into the bottom of the stope from the working space. The backfill grout enters the space between the first folded plate and the second folded plate and the interior of the working space through the grouting holes provided on the first folded plate and the second folded plate.

[0016] Preferably, in step S3, the process of inserting the anchoring device into the failed filling body can be carried out by means of a support rod. The support rod is inserted into the circular channel of the anchoring device to push the anchoring device to the corresponding position in the failed filling body. Preferably, the support rod includes a threaded first rod and several connecting rods. The two ends of the connecting rods are respectively provided with internal and external threads, and the outer diameter of the support rod is equal to the inner diameter of the groove on the first steel plate.

[0017] The beneficial effects of this invention are:

[0018] 1. The mine bottom backfill reinforcement device provided by the present invention includes an anchoring device disposed within the failed backfill and a support structure disposed within a pre-opened working space at the bottom of the anchoring device. The anchor cable on the anchoring device is connected to the support structure, and the support structure has a groove structure. When the anchoring device is installed into the failed backfill, the plate of the anchoring device can be used to compress the failed backfill. The anchoring device unfolds under the cutting action of the failed backfill. During the unfolding process, the action of the plate on the failed backfill can make the failed backfill more compact, thereby giving the failed backfill a certain support capacity. In addition, the setting of the support structure can not only fix the connecting parts of the anchoring device, but also close the failed backfill. At the same time, the setting of the groove structure in the support structure facilitates the fixing of the anchoring device and the installation of the support structure. After the hole structure formed by the groove structure is injected with the filling slurry that can form a high-strength backfill, a high-strength point column can be formed, giving the support structure high strength. In the above process, the physical compression of the failed backfill body by the anchoring device and the supporting effect between the supporting structure and the anchoring device can be used to reinforce the failed backfill body at the bottom of the mine, so that the failed backfill body can regain its support capacity, effectively support the overlying backfill body and the hanging wall ore, and ensure the mining safety of the backfilled mine and the lower ore body.

[0019] 2. The mine bottom backfill reinforcement device provided by this invention, by setting sharp pointed surfaces on the plate of the anchoring device, not only facilitates the installation of the anchoring device into the failed backfill, but also allows the anchoring device to unfold and perform its anchoring function through the cutting action between the pointed surfaces and the failed backfill. Simultaneously, during the unfolding process, the plate compresses the failed backfill, making it more compact. The support structure is designed as a first folded plate and a second folded plate that can be closed together. The first folded plate is provided with screw holes, grouting holes, and round holes. The round holes connect the anchoring device and the support structure, and the grouting holes inject filling grout that forms a high-strength backfill into the space between the first and second folded plates. The screw holes connect the first and second folded plates. This arrangement facilitates the installation of the anchoring device and support structure during actual construction. The device proposed in this invention fully utilizes the existing structural and compositional characteristics of failed backfill and specifically sets up reinforcement devices within it to give the failed backfill strength, thus possessing certain engineering application value. Attached Figure Description

[0020] Figure 1 A top view of the filling reinforcement device provided by this invention installed at the bottom of a mine workings;

[0021] Figure 2 Left view of the filling reinforcement device provided by this invention installed at the bottom of a mine stope;

[0022] Figure 3 for Figure 1 A schematic diagram of the anchoring device in the diagram;

[0023] Figure 4 for Figure 1 A schematic diagram of the first folded plate of the supporting structure in the middle;

[0024] Figure 5 for Figure 4 A schematic diagram of the structure after the first folding plate is closed;

[0025] Figure 6 A schematic diagram of the structure of the struts required when using the filling reinforcement device provided by the present invention;

[0026] The attached figures are labeled as follows:

[0027] 10. Failed filling material; 11. Temporary storage chamber for filling waste; 20. Anchoring device; 21. First steel plate; 22. Second steel plate; 23. Connector; 231. Hinge; 232. Connecting rod; 24. Anchor cable; 30. Working space; 31. Support structure; 311. First folded plate; 3111. First plate body; 3112. Second plate body; 3113. Screw hole; 3114. Round hole; 3115. Grouting hole; 312. Second folded plate; 313. Groove structure; 40. Support rod; 41. First and second rod; 42. Connecting rod. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0030] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Please see Figures 1 to 6 As shown, the present invention provides a reinforcement device for the bottom backfill of a mining stope, including an anchoring device 20 disposed within the failed backfill 10 and a support structure 31 disposed within a pre-opened working space 30 at the bottom of the anchoring device 20. The support structure 31 consists of a first folded plate 311 and a second folded plate 312, which are filled with backfill slurry that can form a high-strength backfill. Anchor cables 24 on the anchoring device 20 are connected to the first folded plate 311 near the anchoring device 20 to achieve the connection between the two. In the above process, the anchoring device 20 can be used to compress the failed backfill 10, which is in a loose state after failure, to give the failed backfill 10 a certain strength. The support structure 31 is used to seal the failed backfill 10 and the high strength of the support structure 31 gives the failed backfill 10 a supporting capacity, effectively supporting the overlying backfill and the hanging wall ore, and ensuring the mining safety of the backfill stope and the lower ore body.

[0032] Specifically, please refer to Figure 2 and Figure 3 and combined Figure 1As shown, the anchoring device 20 is an openable and closable structure, and when opened, it forms a "V" shape. The anchoring device 20 includes a symmetrically distributed first steel plate 21, a second steel plate 22, and a connecting piece 23 connecting the two. The first steel plate 21 has a quadrilateral structure, and a first groove (not shown in the figure) is provided on the wall surface of the first steel plate 21 near the second steel plate 22. A second groove (not shown in the figure) is provided at a corresponding position on the second steel plate 22, which can mate with the first groove. After the first groove and the second groove are mated, a circular channel (not shown in the figure) is formed. The formation of the channel facilitates the installation of the anchoring device 20 within the failed filling body 10. Furthermore, the two opposite sides of the first steel plate 21 are sharp pointed surfaces, and the connector 23 is located on one of these pointed surfaces. It includes a hinge 231 connecting the first steel plate 21 and the second steel plate 22, and a connecting rod 232 mounted on the hinge 231 for mounting the anchor cable 24. The connecting rod 232 includes a hinge rod and a hexagonal screw connected to each other. The hexagonal screw has a through hole for a collar (not labeled in the figure) to pass through, connecting the anchor cable 24 to the connecting rod 232. It should be noted that the structures of the second steel plate 22 and the first steel plate 21 are basically the same, and will not be described further here.

[0033] Further, please refer to Figure 4 and Figure 5As shown, the length and width of the first folded plate 311 do not exceed the length and width of the working space 30. The first folded plate 311 is formed by several first plates 3111 and second plates 3112 arranged alternately. Two adjacent first plates 3111 and the second plates 3112 between them together form a groove structure 313. After the first folded plate 311 and the second folded plate 312 are covered, a hole structure is formed between the groove structure 313 at the corresponding position. After injecting filling slurry that can form a high-strength filling body into the hole structure, a point column structure is formed in the support structure 31. The formation of the point column structure gives the support structure 31 high strength and improves the overall compressive strength and support capacity of the support structure 31 for the bottom layered filling body of the middle section of the mining area. Specifically, screw holes 3113 are respectively provided at both ends of the first plate 3111 near the end, so as to fix the first folded plate 311 and the second folded plate 312 with bolts. One end edge of the second plate 3112 is provided with a grouting hole 3115, so as to inject filling material into the support structure 31. The middle part of the second plate 3112 is also provided with two parallel circular holes 3114 for anchor cables 24 to be connected to the support structure 31, and the diameter of the circular holes 3114 is not less than the diameter of the anchor cable 24. Those skilled in the art should understand that the structures of the first folded plate 311 and the second folded plate 312 are basically the same, and will not be described again here. With the above setup, after the anchoring device 20 is fixed in the failed filling body 10, the anchor cable 24 is installed on the first folded plate 311 using the round hole 3114. Then, the first folded plate 311 and the second folded plate 312 are fixed together with bolts. Then, the filling body is injected into the groove structure 313 formed after the first folded plate 311 and the second folded plate 312 are closed using the grouting hole 3115. The filling body eventually spreads to the entire working space 30.

[0034] In particular, the present invention also provides a method for using the above-mentioned mine bottom filling reinforcement device for the reinforcement of failed filling 10, which specifically includes the following steps:

[0035] S1. Near the transport channel of the intermediate mining area where the backfill material has failed, excavate a temporary storage chamber 11 with a certain capacity for backfill waste.

[0036] S2. Enter the failed backfill at the bottom of the mining area from the existing intermediate mining area connecting roadway and excavate the working space 30 for setting up the support structure 31. To ensure the safety of on-site operations, appropriate support measures can be taken to support the top of the working space according to the conditions of the top backfill or surrounding rock during the excavation and subsequent operations.

[0037] S3. Insert the anchoring device 20 horizontally into the failed backfill 10 at the bottom of the stope from the working space 30. After inserting to a certain depth, pull the anchor cable 24 on the anchoring device 20 in the opposite direction. At the same time, install the first folded plate 311 at the boundary of the backfill at the bottom of the stope in the working space 30, and let the anchor cable 24 pass through the two round holes 3114 on the first folded plate 311 in sequence. Then weld the anchor cable 24 onto the first folded plate 311 to complete the installation of the first folded plate 311. Here, letting the anchor cable 24 pass through the first folded plate 311 before welding can effectively avoid anchoring. When cable 24 is subjected to the force of the first steel plate 21 and the second steel plate 22, it deforms, affecting the stability of the entire device. Then, the second folding plate 312 is closed with the first folding plate 311, and the first folding plate 311 and the second folding plate 312 are fixed together using the screw holes 3113 provided at the corresponding positions of the two. Next, the filling material is injected into the groove structure 313 formed after the first folding plate 311 and the second folding plate 312 are closed through the grouting hole 3115, and the injection is stopped when the filling material spreads into the entire working space 30.

[0038] Further, in step S3, to facilitate the insertion of the anchoring device 20 into the failed filling body 10, a support rod 40 can be used. The support rod 40 is inserted into the circular channel on the anchoring device 20 to push the anchoring device 20 to the corresponding position in the failed filling body 10, and then the support rod 40 is taken out from the circular channel and recycled. Specifically, the support rod 40 includes a threaded first rod 41 and a connecting rod 42. The two ends of the connecting rod 42 are respectively provided with internal and external threads, so that when it is necessary to extend the support rod 40, the required number of connecting rods 42 can be connected to the first rod 41.

[0039] It should be noted that the length and width of the first steel plate 21 and the second steel plate 22, as well as the size of the working space 30, can be designed according to the size of the failed filling body 10 for reinforcement work as needed, as long as the size of the working space 30 does not affect the reinforcement work and the reinforcement effect is good, it is not limited here.

[0040] In summary, the mine bottom backfill reinforcement device proposed in this invention includes an anchoring device 20 installed within the failed backfill 10 and a support structure 31 installed within a pre-opened working space 30 at the bottom of the anchoring device 20. Anchor cables 24 on the anchoring device 20 are connected to the support structure 31, and the support structure 31 has a groove structure 313. The installation of the anchoring device 20 compacts the failed backfill 10, thereby providing it with a certain support capacity. The support structure 31 not only fixes the connectors 232 of the anchoring device 20 but also partially seals off the failed backfill 10. During this process, the physical compression of the failed backfill 10 by the anchoring device 20 and the support between the support structure 31 and the anchoring device 20 jointly reinforce the failed backfill 10 at the bottom of the mine, enabling it to regain its support capacity, effectively supporting the overlying backfill and hanging wall ore, and ensuring the safety of mining the backfilled stope and the lower ore body. The device proposed in this invention makes full use of the existing structural and compositional characteristics of failed filling bodies and sets up reinforcement devices inside them to give the failed filling bodies strength, which has certain engineering application value.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A device for reinforcing the bottom filling body of a mine stope, characterized in that, It includes an anchoring device installed in the failed filling body and a support structure installed in the pre-opened working space at the bottom of the anchoring device; the anchor cable on the anchoring device is connected to the support structure, the anchoring device is in a "V" shape after being stabilized, and the support structure has a groove structure inside. The anchoring device includes a first steel plate, a second steel plate, and a connector connecting the first steel plate and the second steel plate, and the first steel plate and the second steel plate can be opened and closed. The first steel plate has a quadrilateral structure. A first groove is provided on the wall of the first steel plate near the second steel plate. A second groove is provided at the corresponding position of the second steel plate, which can mate with the first groove. The first groove and the second groove mate to form a circular channel. Two opposite sides of the first steel plate are sharp pointed surfaces, and the connector is provided on one side of one of the pointed surfaces. The connector includes a hinge connecting the first steel plate and the second steel plate, and a connecting rod disposed on the hinge for sleeved anchor cable. The connecting rod includes a hinge rod and a hexagonal screw connected to each other. The hexagonal screw has a through hole for a collar for connecting the anchor cable to the connecting rod to pass through. The support structure consists of a first folded plate and a second folded plate, which are filled with filling slurry capable of forming a high-strength filling body and are fitted together. The first folded plate is formed by a plurality of first plates and second plates arranged alternately. The length and width of the first folded plate do not exceed the length and width of the working space. The groove structure is composed of two adjacent first plates and a second plate located between the two first plates. After the first folded plate and the second folded plate are closed, a hole structure is formed between the groove structures at corresponding positions. After the filling slurry that forms a high-strength filling body is injected into the hole structure, a point column structure is formed in the support structure. The formation of the point column structure gives the support structure high strength and improves the overall compressive strength and support capacity of the support structure for the bottom layered filling body of the middle section of the mining area.

2. The mine bottom filling reinforcement device according to claim 1, characterized in that, The first plate has screw holes at both ends near the ends to connect the first folded plate and the second folded plate; one end edge of the second plate has a grouting hole for injecting the filling slurry into the support structure; the middle of the second plate also has two parallel circular holes for connecting the anchor cable to the support structure, and the diameter of the circular holes is not less than the diameter of the anchor cable.

3. A method of using a mine bottom backfill reinforcement device according to any one of claims 1-2 for reinforcing failed backfill, characterized in that, Includes the following steps: S1. Near the transport channel of the intermediate mining area where the backfill material has failed, excavate a temporary storage chamber with a certain capacity for backfill waste. S2. Enter the failed backfill at the bottom of the mining area from the existing intermediate mining area connecting roadway and excavate the working space for setting up the support structure. S3. Anchoring devices are horizontally inserted into the failed backfill at the bottom of the stope from the working space. After being inserted to a certain depth, the anchor cables on the anchoring devices are pulled in the opposite direction. At the same time, a first folded plate is installed at the boundary of the backfill at the bottom of the stope in the working space, and the anchor cables are sequentially passed through two round holes on the first folded plate. After welding, the installation of the first folded plate is completed. Then, the second folded plate is combined and fixed together with the first folded plate cover. Next, backfill grout is injected into the bottom of the stope from the working space. The backfill grout enters the space between the first folded plate and the second folded plate and the interior of the working space through the grouting holes provided on the first folded plate and the second folded plate.

4. The method of using the mine bottom filling reinforcement device according to claim 3 for reinforcing failed filling bodies, characterized in that, In step S3, the process of inserting the anchoring device into the failed filling body can be carried out by means of a support rod. The support rod is inserted into the circular channel of the anchoring device to push the anchoring device to the corresponding position in the failed filling body.

5. The method of using the mine bottom filling reinforcement device according to claim 4 for reinforcing failed filling bodies, characterized in that, In step S3, the support rod includes a threaded first rod and several connecting rods. The two ends of the connecting rods are respectively provided with internal and external threads, and the outer diameter of the support rod is equal to the inner diameter of the groove on the first steel plate.

Images