Method for rapidly filling and supporting coal pillars under coal mine

Abstract

The invention relates to the technical field of coal mine underground filling and supporting, and discloses a method for rapidly filling and supporting coal pillars under a coal mine, which comprises the following steps of: rapidly completing a filling task through a transportation system, a filling structure, a mounting system and a filling system after a coal mine tunnel is excavated and mined; according to the inter-face coal pillar rapid filling system, prefabricated wall blocks, roof-contacted pipelines and the like needed by filling and supporting are conveyed into an excavation roadway through a conveying system, the installation process roughly comprises the steps that the roof-contacted pipelines are installed on the top of a filling area, the prefabricated blocks are installed layer by layer through installation equipment with a method similar to brick wall building, and a closed area is constructed; the closed area formed by the prefabricated wall body is filled with the filling material through the conveying pipeline, the top space is further filled through the roof-contacted pipeline, the supporting and filling speed is increased, the time for waiting for solidification is shortened, supporting force is provided faster, coal pillars originally used for supporting are replaced, and the coal mining utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of underground support and filling in coal mine mining engineering, and particularly relates to a method for rapid filling and support of inter-panel coal pillars in coal mines. Background Art

[0002] The width of the inter-panel coal pillars left in longwall mining faces of underground coal mines in China is generally 20 - 50 m. After the working face is mined, the coal pillars generally cannot be recovered, resulting in a low recovery rate of coal resources. How to recover the coal pillars is a hot and difficult issue in current mining research. The inter-panel coal pillar scheme proposes an integrated operation of tunneling, support, and filling, and particularly relates to a method for rapid filling and support of inter-panel coal pillars in coal mines.

[0003] Chinese Patent with the application number 201510936436.6 discloses a construction method for improving the performance of coal pillars by filling walls, which relates to the field of coal mine strip mining. Combining multiple mining methods such as roadway mining, filling mining, and strip mining, the filling walls improve the performance of coal pillars from two aspects: laterally constraining the mining coal pillars and sharing the bearing load of the mining coal pillars, coordinating the relationship between reducing the size of coal pillars and the stability of coal pillars, increasing the extraction rate of strip mining. The pressure sensors installed in the flat roadway can effectively monitor the stability of the filling walls, providing a basis for the recovery of mining coal pillars. When recovering the mining coal pillars, since the working face haulage roadway and the track roadway are excavated on both sides of the mining coal pillars, only one side of the coal wall needs to be supported, and the side of the filling wall does not need to be supported, reducing the roadway support cost.

[0004] Existing underground coal mine filling methods, such as the conventional underground filling methods disclosed in Chinese Patents CN118208235A and CN114233293A, like flexible membrane support and removing after filling with baffles, have serious technical drawbacks. The most prominent one is the extremely slow solidification speed. After a working cycle is completed, it is necessary to wait for the filling body to take shape, and this waiting process takes a very long time. For example, in actual operations, when using flexible membrane support, it often takes several hours or even longer for the filling body to have the initial stable support ability from filling, greatly affecting the mining efficiency. In addition, due to the long waiting time, a stable support structure cannot be formed in time, and effective support force cannot be provided quickly, making it difficult to replace the coal pillars originally used for temporary support in a timely manner, further restricting the recovery rate of coal resources.

[0005] Therefore, in order to meet the requirements of inter-panel coal pillar tunneling, support, and filling operations, a more efficient, environmentally friendly, and economical support and wall filling method is needed. The present invention proposes a method for rapid filling and support of inter-panel coal pillars in coal mines to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a rapid filling and support method for the coal pillar between rooms in a coal mine shaft to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: A rapid filling and support method for the coal pillar between rooms in a coal mine shaft, using a transportation system, a filling structure, an installation system, and a filling system. The specific steps include:

[0008] S1: The transportation system transports the filling structure required for filling and support to the inside of the driving roadway.

[0009] Specifically, the transportation equipment transports the materials required for the roof connecting pipe and the precast wall body and the installation system to the filling area in the roadway. Among them, the transportation system includes transportation equipment, which is arranged on both sides of the roadway, and the transportation equipment is selected from belt conveyors or trackless rubber-tyred vehicles.

[0010] S2: Move the installation system to around the precast wall body and the roof connecting pipe in step S1, and use the installation system to install the precast wall body and the roof connecting pipe that have been transported into the driving roadway correspondingly.

[0011] Specifically, the first precast wall, the second precast wall, and the third precast wall are respectively installed to the designated area in the coal mine through the installation equipment. During the process of the installation equipment installing the precast wall body, the installation sequence of the installation equipment is:

[0012] First, install the first precast wall, and then install the second precast wall. At the same time, during the installation of the second precast wall, install the perforated precast block with a filling port to the position near the top of the center of the second precast wall. Then, when using the installation equipment to install the roof connecting pipe at the top of the roadway, fix the roof connecting pipe to the top of the roadway with screws. In addition, install the two roof connecting pipes required for one working cycle in sequence. Among them, the precast wall body is composed of the first precast wall, the second precast wall, and the third precast wall, and a perforated precast block is provided at a position near the middle of the upper surface of the second precast wall.

[0013] S3: Then, the filling system fills and reinforces the installed filling structure, and makes the filling structure form a support wall.

[0014] Specifically, through the filling equipment in cooperation with the conveying pipe, the hose, and the filling port, transport the filling material into the sealed space formed by the precast wall body. This process is the filling and reinforcement work for the closed area inside the precast wall body.

[0015] Furthermore, the material of the precast wall body is selected from coal gangue or cement mortar. When the length, width, and height of the precast wall body are greater than 300 mm, a groove structure is provided at the bottom of the precast wall body. The filling material is filled in the closed area formed by the precast wall body, and a notch block is provided at the upper part of the precast wall body.

[0016] Further, the installation system includes installation devices, where the installation devices are used to transport the precast wall body to a designated position and install it. The number of the installation devices is set to two, and each of the installation devices is oppositely arranged at the end of the precast wall body close to the roadway advancing direction.

[0017] Further, the filling system includes filling equipment, where the filling equipment consists of a pumping system, a conveying pipeline, and a control system. The filling equipment is used to quickly and evenly fill the filling material into the enclosed space surrounded by the precast wall body.

[0018] Further, the filling system further includes a roof contact pipeline, where the roof contact pipeline is arranged at the top of the precast wall body and the filling material. The roof contact pipeline is used to continue filling the top of the filling area after filling is completed. The roof contact pipeline is fixed to the roadway top by screws, and a notch block is provided inside the roof contact pipeline.

[0019] Further, the filling equipment is arranged outside the second precast wall, and the filling equipment is provided with a hose through the second precast wall. When the filling equipment is in the filling state, it is connected to the filling port. The conveying pipeline consists of the filling material, the hose, and the connector. The filling material is connected to the conveying pipeline through the hose and the filling equipment, and the material of the hose is set as rubber material.

[0020] Beneficial effects: The filling material is filled into the enclosed area formed by the precast wall body through the conveying pipeline. When the filling material reaches a predetermined height inside the precast wall body, the roof contact pipeline is used to perform the roof contact work on the top of the precast wall body. Subsequently, the filling material is input into the roof contact pipeline through the filling equipment, and the filling material flows out from the notch block in the roof contact pipeline to the top of the precast wall body, so as to achieve the effect of further filling the top space by using the roof contact pipeline, improve the filling speed, reduce the waiting solidification time, provide support force faster, replace the coal pillars originally used for support, improve the coal mine exploitation utilization rate, and provide a strong guarantee for the safe production in the coal mine. Description of the Drawings

[0021] Figure 1 It is a top view of the working face of the inter-panel coal pillar project;

[0022] Figure 2 It is the schematic diagram of the present invention;

[0023] Figure 3 It is an axonometric view of the precast wall block in the embodiment of the present invention;

[0024] Figure 4 It is a top view of the precast wall and the filling body in the embodiment of the present invention;

[0025] Figure 5 It is a diagram showing the dimensional relationship among precast wall blocks, mortar, and precast walls in the embodiments of the present invention;

[0026] Figure 6 It is an axonometric view of the geometric relationship between the precast wall and the pipe for topping in the embodiments of the present invention;

[0027] Figure 7 It is a left view of the pipe for topping in the embodiments of the present invention;

[0028] Figure 8 It is a cross-sectional view of the filling working face in the embodiments of the present invention;

[0029] Figure 9 It is a flow chart of the wall filling in the embodiments of the present invention.

[0030] In the figure: 1. Transportation equipment; 2. Precast wall body; 21. First precast wall; 22. Second precast wall; 23. Third precast wall; 221. Perforated precast block; 3. Filling material; 4. Installation equipment; 5. Pipe for topping; 51. Notch block; 6. Filling port; 7. Filling equipment; 8. Delivery pipe. Specific implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0032] The present invention provides a method for rapid filling and support of the coal pillar in the underground room of a coal mine as Figures 1 to 9 , which uses a transportation system, a filling structure, an installation system, and a filling system;

[0033] The specific steps include:

[0034] S1: Use the transportation system to transport the filling structure required for filling and support to the inside of the driving roadway; specifically, the transportation system includes transportation equipment 1, and the transportation equipment 1 transports the materials required for the pipe for topping 5 and the precast wall body 2 and the installation system to the filling area in the roadway. Among them, the transportation equipment 1 of the transportation system is arranged on both sides of the roadway, and the transportation equipment 1 is selected as a belt conveyor or a trackless rubber-tyred vehicle.

[0035] S2: Move the installation system to the periphery of the precast wall body and the pipe for topping, and use the installation system to install the precast wall body and the pipe for topping that have been transported into the driving roadway correspondingly;

[0036] Specifically, the installation system includes an installation device 4. The first precast wall 21, the second precast wall 22, and the third precast wall 23 are respectively installed on the coal wall surface in the coal mine through the installation device 4. During the installation process of the precast wall body 2 by the installation device 4, the installation sequence of the installation device 4 is as follows:

[0037] First, install the first precast wall 21, and then install the second precast wall 22. During the installation of the second precast wall 22, install the perforated precast block 221 with a filling port 6 at a position near the top of the center of the second precast wall 22. Then, when installing the roof connecting pipe 5 at the top of the roadway by using the installation device 4, fix the roof connecting pipe 5 to the top of the roadway with screws. In addition, install two roof connecting pipes 5 required for one working cycle in sequence. Among them, the precast wall body 2 is composed of the first precast wall 21, the second precast wall 22, and the third precast wall 23. There is a perforated precast block 221 at a position near the middle of the upper surface of the second precast wall 22.

[0038] S3: Then, use the filling system to fill and reinforce the installed filling structure, and form a supporting wall from the filling structure;

[0039] Specifically, through the filling device 7, the conveying pipe 8, the hose, and the filling port 6, the filling material 3 is transported into the sealed space formed by the precast wall body 2. This process is the filling and reinforcement work for the enclosed area inside the precast wall body 2.

[0040] As Figure 2 shown, the transportation system includes a transportation device 1. The transportation device 1 is arranged on both sides of the roadway. Among them, the transportation device 1 is selected as a belt conveyor or a trackless rubber-tyred vehicle. The transportation device 1 is used to transport the filling structure to the designated working area. The installation system includes an installation device 4. Among them, the installation device 4 is used to transport the precast wall body 2 to the designated position and install it. The number of installation devices 4 is set to two, and each installation device 4 is oppositely arranged at the end of the precast wall body 2 near the roadway advancing direction.

[0041] As Figure 3 、 Figure 4 、 Figure 6 and Figure 8As shown in the figure, the filling structure includes a precast wall body 2 and a filling material 3. The precast wall body 2 is composed of prefabricated building elements and is the main part of the rapid filling support system. The precast wall body 2 consists of a first precast wall 21, a second precast wall 22, and a third precast wall 23. A perforated precast block 221 is provided at a position near the middle of the upper surface of the second precast wall 22. A filling port 6 is provided in the hole of the perforated precast block 221. The precast wall body 2 is used to form a closed filling area underground. The material of the precast wall body 2 is selected from gangue or cement mortar. When the length, width, and height of the precast wall body 2 are greater than 300 mm, a groove structure is provided at the bottom of the precast wall body 2 (for details, please refer to Figure 3 ). The filling material 3 is filled in the closed area formed by the precast wall body 2. A notch block 51 is provided inside the roof connecting pipe 5.

[0042] The filling system includes a filling device 7. The filling device 7 consists of a pumping system, a conveying pipeline 8, and a control system. The filling device 7 is used to quickly and evenly fill the filling material 3 into the closed space surrounded by the precast wall body 2. The filling system also includes a roof connecting pipe 5. The roof connecting pipe 5 is arranged at the top of the precast wall body 2 and the filling material 3. The roof connecting pipe 5 is used to continue filling the top of the filling area after filling is completed. The roof connecting pipe 5 is fixed to the top of the roadway by screws. The filling device 7 is arranged outside the second precast wall 22, and the filling device 7 is provided with a hose through the second precast wall 22. When the filling device 7 is in the filling state, it is connected to the filling port 6. The conveying pipeline 8 consists of the filling material 3, the hose, and the connector. The filling material 3 is connected to the conveying pipeline 8 through the hose and the filling device 7, and the material of the hose is set as rubber material.

[0043] The specific steps of rapid filling support are as follows:

[0044] First, use the transportation device 1 to transport the roof connecting pipe 5 and the precast wall body 2 to the roadway filling area. Subsequently, use the installation device 4 to install the first precast wall 21, the second precast wall 22, and the third precast wall 23 on the coal wall surface underground in sequence. During the installation process of the precast wall body 2 by the installation device 4, the installation sequence of the installation device 4 is to install the first precast wall 21 first, and then install the second precast wall 22. At the same time, during the installation of the second precast wall 22, install the perforated precast block 221 with the filling port 6 at a position near the top of the center of the second precast wall 22. Subsequently, the personnel and equipment move out of the filling area, and after checking the installation conditions of the first precast wall 21 and the second precast wall 22, install the third precast wall 23, and make the installed precast wall body 2 form a closed area. When transporting the precast wall body 2 with a groove at the bottom by the transportation device 1, transport it in a consistent posture.

[0045] When installing the roof-connecting pipe 5 at the top of the roadway, the roof-connecting pipe 5 is fixed to the top of the roadway using screws. Additionally, two roof-connecting pipes 5 required for one working cycle are installed in sequence. During the process of filling the filling material 3, it is made to evenly enter the interior of the precast wall body 2 to avoid the existence of filling dead corners that may affect the stability of the supporting wall. The connection states of the hose with the filling equipment 7, the hose with the conveying pipe 8, and the conveying pipe 8 with the filling port 6 on the second precast wall 22 are checked in sequence. One end of the hose is always kept connected to the output end of the filling equipment 7, while the other end of the hose is connected to the end of the conveying pipe 8, facilitating the formation of a passage between the conveying pipe 8 and the hose, enabling the filling equipment 7 to transport the filling material 3 through the conveying pipe 8 and the hose to the filling area.

[0046] Subsequently, through the cooperation of the filling equipment 7, the conveying pipe 8, the hose, and the filling port 6, the filling material 3 is transported into the sealed space formed by the precast wall body 2. This process is for the filling and reinforcement work of the enclosed area within the precast wall body 2. When the filling material 3 reaches the predetermined height, roof connection treatment is required. During this process, the top pipe is used for roof connection work. At this time, first disconnect the connection between the conveying pipe 8 and the filling equipment 7. Subsequently, connect the roof-connecting pipe 5 located at the top of the precast wall body 2 to the filling equipment 7, and turn on the filling equipment 7 to introduce an appropriate amount of filling material 3 into the roof-connecting pipe 5. The filling material 3 flows out from the notch block 51 of the reserved roof-connecting pipe 5 to the filling area, gradually filling the area to be filled and completing the roof connection work. When the filling work of the area to be filled is completed, continue to introduce the filling material 3 into the roof-connecting pipe 5 through the filling equipment 7 to make the filling material 3 closely combine with the roof-connecting pipe 5. Subsequently, stop the filling equipment 7, and after the roof connection filling work is completed, it is not recovered.

[0047] It should be noted that when designing and manufacturing the precast wall body 2, first measure the dimensional information of the filling area, and proportionally manufacture the adapted precast wall body 2 and the roof-connecting pipe 5 according to the measured dimensional information of the filling area. Subsequently, prepare the required filling material according to the working conditions, and design the dimensions, shape, and structure of the precast wall body 2 according to the requirements of the coal mine underground. When the length, width, and height of the designed precast wall body 2 are each greater than 300 mm according to the requirements of the coal mine underground, at this time, set the bottom of the designed precast wall body 2 as a groove structure for positioning and transportation during the filling support process. When the size of the precast wall body 2 designed according to the requirements is small, use a mortar spraying device to make the sprayed mortar adhere to the surface of the precast wall body 2, which is to increase the self-strength of the precast wall body 2 with a small size and lay a foundation for the support work in the coal mine underground. Additionally, when the filling material 3 reaches the predetermined height during the filling process, roof connection treatment work is required. At this time, it is necessary to select the size and length of the roof-connecting pipe 5 according to the length, width, and height of the filling area and the roof connection speed, such as Figure 1 、 Figure 2 andFigure 3 As shown, N represents the number of precast wall bodies 2 installed in a single direction, and the number is a positive integer. The wall bodies satisfy the following algebraic relationship:

[0048] Algebraic formula for obtaining the filling material: Filling height: A = HN + S(N - 1) = h;

[0049] Obtain the filling width on both sides of the precast wall body 2: B = WN + S(N - 1) = w. Among them, the dimensions of the precast wall body 2 are represented by L (length), W (width), and H (height), and the unit is millimeter (mm). Satisfying the above relationship, its specific size can be changed according to different working environments and working requirements.

[0050] The reinforcement period of the filling material is as follows:

[0051]

[0052] It should be noted that: Through the specific implementation manners of the above steps, the rapid wall filling method for the inter-panel coal pillar of the present invention can achieve rapid, efficient, and stable filling and support effects.

[0053] Finally, it should be noted that: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for rapid filling and supporting coal pillars below a coal mine, characterized in that: Using the transport system, filling structure, installation system and filling system, the specific steps include: S1: The transportation system transports the filling structure required for filling support to the interior of the excavation tunnel; Specifically, the transport equipment (1) transports the materials and installation system required for the top connection pipe (5) and the prefabricated wall body (2) to the filling area in the tunnel, wherein the transport system includes the transport equipment (1), the transport equipment (1) is arranged on both sides of the tunnel, and the transport equipment (1) is a belt conveyor or a trackless rubber-wheeled vehicle; S2: moving the installation system to the vicinity of the prefabricated wall body (2) and the top connection pipe (5) in step S1, and using the installation system to correspondingly install the prefabricated wall body (2) and the top connection pipe (5) that have been transported into the excavation tunnel; Specifically, the first prefabricated wall (21), the second prefabricated wall (22) and the third prefabricated wall (23) are installed layer by layer in a designated area of ​​the coal mine using a method similar to laying a brick wall by using the installation equipment (4). In the process of installing the prefabricated wall body (2) by the installation equipment (4), the installation sequence of the installation equipment (4) is as follows: The first prefabricated wall (21) is installed first, and then the second prefabricated wall (22) is installed. During the installation of the second prefabricated wall (22), a prefabricated block (221) with a filling port (6) is installed at a position near the center of the second prefabricated wall (22) and near the top. When a top connection pipe (5) is installed at the top of the tunnel, the top connection pipe (5) is fixed to the top of the tunnel by screws. In addition, two top connection pipes (5) required for one working cycle are installed in sequence. The prefabricated wall body (2) is composed of the first prefabricated wall (21), the second prefabricated wall (22) and the third prefabricated wall (23). A prefabricated block (221) with a hole is provided near the middle of the upper surface of the second prefabricated wall (22). S3: Then, the filling structure after installation is filled and reinforced by the filling system, and the filling structure is formed into a supporting wall; Specifically, the filling material (3) is transported into the sealed space formed by the prefabricated wall body (2) through the filling device (7) in cooperation with the conveying pipeline (8), the hose and the filling port (6).

2. The method for rapid filling and supporting coal pillars below a coal mine according to claim 1, characterized in that: The filling structure comprises a prefabricated wall body (2) and a filling material (3); the prefabricated wall body (2) is composed of pre-processed building elements; the prefabricated wall body (2) is the main part of the rapid filling support system; a filling port (6) is provided in the hole of the perforated prefabricated block (221); and the prefabricated wall body (2) is used to form a closed filling area underground.

3. The method for rapid filling and supporting coal pillars below a coal mine according to claim 2, characterized in that: The material of the prefabricated wall body (2) is selected from coal gangue or cement mortar. When the length, width and height of the prefabricated wall body (2) are greater than 300 mm, a groove structure is provided at the bottom of the prefabricated wall body (2), and the filling material (3) is filled in the closed area formed by the prefabricated wall body (2).

4. The method for rapid filling and supporting coal pillars below a coal mine according to claim 1, characterized in that: The installation system comprises an installation device (4), wherein the installation device (4) is used to transport the prefabricated wall body (2) to a designated location and install it, the number of the installation devices (4) is set to two, and each of the installation devices (4) is relatively arranged at the end of the prefabricated wall body (2) close to the tunnel advancement direction.

5. The method for rapid filling and supporting coal pillars below a coal mine according to claim 1, characterized in that: The filling system comprises a filling device (7), wherein the filling device (7) is composed of a pumping system, a conveying pipeline (8) and a control system, and the filling device (7) is used to quickly and evenly fill the filling material (3) into the closed space surrounded by the prefabricated wall body (2).

6. The method for rapid filling and supporting coal pillars below a coal mine according to claim 5, characterized in that: The filling system further comprises a top connection pipe (5), wherein the top connection pipe (5) is arranged on the top of the prefabricated wall body (2) and the filling material (3), and the top connection pipe (5) is used to continue filling to the top of the filling area after the filling is completed. The top connection pipe (5) is fixed to the top of the tunnel by screws, and a notch block (51) is opened inside the top connection pipe (5).

7. The method for rapid filling and supporting coal pillars below a coal mine according to claim 6, characterized in that: The filling device (7) is arranged outside the second prefabricated wall (22), and the filling device (7) is provided with a hose through the second prefabricated wall (22). When the filling device (7) is in filling, it is connected to the filling port (6). The conveying pipeline (8) is composed of the filling material (3), the hose and the connecting piece. The filling material (3) is connected to the conveying pipeline (8) through the hose and the filling device (7), and the material of the hose is set to be rubber material.

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