Gob-side entry retaining gangue blocking hydraulic support withdrawing process
Through the hydraulic bracket retraction process of the gangue arrest along the airway, the problem that the traditional bracket retraction method cannot adapt to the special position and length of the gangue arrest support is solved, and a safe and efficient bracket retraction process is achieved, and the bracket retraction task of special structures and layouts is adapted to.
Patent Information
- Application Number
- CN202510483741.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2025-07-11
AI Technical Summary
The traditional bracket retracement method cannot adapt to the special installation position and length of the gangue stop bracket, which poses great safety risks.
The retraction process of the hydraulic support for gangue arrest along the airway is designed, including the early anchor net + single body + chain wooden stack support, and gradually retract T3, T4 and gangue arrest support. The linkage of the shovel truck and the oil cylinder is used, combined with laser rangefinder and inclination sensor monitoring, to ensure the stability and safety of the bracket.
It effectively enhances the stability of the operation area, reduces the risk of roof collapse, ensures the safety and smoothness of the gangue stop bracket retraction, forms a standardized operation process, and adapts to the special structure and layout of the bracket retraction task.
Smart Images
Figure CN120291904A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of support withdrawal technology, and in particular to a technology for withdrawing a hydraulic support for rock blocking along a gob-side lane retaining. Background Art
[0002] The gangue-blocking hydraulic support along the goaf is a key equipment used to block gangue and maintain the stability of the goaf when retaining the goaf in coal mining. Its structural design can effectively resist the gangue pressure in the goaf area, ensure the integrity of the goaf space, and create favorable conditions for subsequent production.
[0003] During the retraction of the working equipment, due to the installation of 3 sets of rock retaining supports behind the tail beam of the head T4 support, with an overall length of 21 meters, the rock retaining supports could not be retracted according to the traditional support retraction method, and there was a great safety risk. It failed to adapt to the special installation position and length of the rock retaining support, exposing its lack of flexibility and adaptability when faced with the task of retracting supports with special structures and layouts, and had technical limitations.
[0004] Therefore, in view of the problem that the above-mentioned traditional support withdrawal method cannot adapt to the special installation position and length of the rock retaining support and there is a great safety risk, a withdrawal process of the rock retaining hydraulic support along the goaf can be designed. Summary of the invention
[0005] In order to overcome the problem that the traditional support retraction method cannot adapt to the special installation position and length of the rock retaining support for retraction, and there is a great safety risk.
[0006] The technical solution of the present invention is: a process for withdrawing a hydraulic support for rock blocking along a gob-retaining tunnel, and the steps are as follows: SI: Preliminary preparation Before withdrawing the rock-blocking support, the mine owner shall carry out anchor net + single body + interlocking wood pile support at the T3 support, T4 support and rock-blocking support, and complete the withdrawal of the slot transfer machine at the same time; S2: T3 stent withdrawal S21: lowering the T3 stent supply; S22: Using the support's own pushing cylinder and the bottom lifting cylinder to work together, the support crawls to the position of the withdrawal channel; S23: Use a 55-ton forklift to drag the T3 bracket to the rubber transport chute for loading; S3: T4 stent withdrawal S31: lowering the T4 stent supply; S32: Using the support's own pushing cylinder and the bottom lifting cylinder to work together, the support crawls to the position of the withdrawal channel; S33: Use a 55-ton forklift to drag the T4 bracket to the rubber transport chute for loading; S4: The rock retaining support moves forward and is withdrawn in steps S41: The three groups of rock retaining supports are moved forward in a stepping manner, so that the first group of rock retaining supports is moved forward to the T4 support position; S42: dismantle the push cylinder and the tension cylinder connecting the first and second groups, and use a 55-ton shovel to remove the first group of rock retaining brackets; S43: The remaining two sets of rock retaining supports are moved forward in a stepping manner, so that the third set of rock retaining supports (3) is moved forward to the T4 support position; S44: dismantle the push cylinder and tension cylinder connected to the second and third groups, and use a 55-ton shovel to remove the second group of rock retaining brackets; S45: Continue to complete the withdrawal of the third group of rock-blocking supports, and the withdrawal of the rock-blocking supports is now completed; S5: Place two general supports for the working surface at the original T4 and T3 supports to support the roof.
[0007] Preferably, in step S21, before lowering the T3 bracket, the bracket's liquid supply system is first comprehensively checked, including whether the pipeline connections are firm, whether the valves open and close flexibly, and whether the hydraulic oil is sufficient and clean, to ensure the normal operation of the liquid supply system; during the liquid supply lowering process, a dedicated person is arranged to observe the movement of each component of the bracket. If any abnormality is found, the operation is stopped immediately and the fault is checked.
[0008] Preferably, in step S22, when the bracket crawls to the withdrawal channel position by utilizing the bracket's own pushing cylinder and the bottom lifting cylinder in linkage, a steel plate is laid on the bracket's crawling path in advance to increase the friction between the bracket and the bottom plate to prevent the bracket from slipping during the crawling process.
[0009] Preferably, in step S23, when a 55-ton forklift is used to tow the T3 bracket to the rubber transport chute for loading, the forklift driver shall be professionally trained and have corresponding qualifications, and shall conduct a comprehensive inspection of the brake, steering and hydraulic systems of the forklift before towing to ensure that the vehicle performs well; during the towing process, a special binding device shall be used to fix the bracket and the forklift, with no less than 5 bindings, and special personnel shall be arranged to monitor on both sides of the bracket and around the forklift to ensure that the towing route is unobstructed.
[0010] Preferably, in step S41, when the three groups of rock-blocking supports are moved forward in steps, the distance between two adjacent groups of supports is monitored in real time by a laser rangefinder installed on the support, and the tilt state of the support is monitored in real time by inclination sensors installed on the top and bottom of the support. Once the tilt angle exceeds the range, the forward movement operation is stopped immediately, and the deviation is corrected by adjusting the support cylinder or taking auxiliary support measures to ensure the stability of the support during movement.
[0011] Preferably, in step S42, before disassembling the push cylinders and tension cylinders connecting the first group and the second group, first release the pressure of the cylinders. Use a special pressure relief tool to slowly reduce the pressure in the cylinders to zero. During the disassembly process, use appropriate disassembly tools to prevent damage to the cylinders and connecting components. After disassembly, clean, inspect the cylinders and connecting components, and make marks for subsequent installation.
[0012] Preferably, in step S45, when continuing to complete the removal of the third group of rock baffle supports, the removal method is the same as that of the first group and the second group of rock baffle supports. Before removing the third group of rock baffle supports, re-check the withdrawal passage to ensure that there are no sundries, no accumulated water, and the roof support is intact. After the removal is completed, comprehensively clean the entire withdrawal area, and promptly transport the disassembled cylinders and connectors to the designated location for storage.
[0013] Preferably, in step S5, before steadily placing the ordinary support, comprehensively check the structural integrity and hydraulic system of the ordinary support to ensure the normal operation of the ordinary support. During the steady placement process, use special lifting equipment, select the lifting points at the designed lifting positions of the ordinary support, the lifting process is stable and slow. After accurately placing the ordinary support at the predetermined position, immediately level and fix the ordinary support, and connect the hydraulic system of the ordinary support to the roadway liquid supply system to ensure that the ordinary support can provide effective support in a timely manner.
[0014] Preferably, in step S5, after the installation of the ordinary support is completed and connected to the roadway liquid supply system, detect the sealing performance of the ordinary support.
[0015] Advantages of the present invention: 1. Before withdrawing the shielding support of the present invention, the mining party carried out bolt mesh + single prop + interlocking crib support at the T3 support, T4 support and shielding support, effectively enhancing the stability of the operation area and reducing safety risks such as roof collapse. The entire process has been measured on-site and technically demonstrated by the project department, greatly ensuring the safety of the operators during the support withdrawal. This forms a sharp contrast with the traditional method that has great safety risks. This process first removes the T3 support and T4 support at the head, leaving enough space for the withdrawal of the shielding support, successfully solving the problem that the traditional method cannot withdraw the shielding support due to insufficient space planning, and enabling subsequent operations such as the stepping forward and step-by-step removal of the three groups of shielding supports to proceed smoothly. The detailed and systematic step arrangement of this process, from the preliminary preparation, the withdrawal of the T3 and T4 supports, the step-by-step operation of the shielding support to the final installation and support of the ordinary support, forms a complete and standardized operation process for the withdrawal of the shielding support. Using this process to withdraw the shielding support effectively guarantees the smooth progress of the withdrawal of the shielding support, provides a standardized technical guidance for the future withdrawal operation of the shielding support, especially for the special installation position and large length of the shielding support, demonstrating how to flexibly handle the withdrawal task of the support with special structure and layout, making up for the limitations of the traditional method in technical adaptability. This process can be used as the operation standard for the future withdrawal of the shielding support, standardizing the operation process of the withdrawal of the shielding support. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The figure shows the operation schematic diagram of S2 in the gob-side entry retaining shielding hydraulic support withdrawal process of the present invention; Figure 2 It is the operation schematic diagram of S3 in the present invention; Figure 3 The operation schematic diagram of S41 in the present invention; Figure 4 The operation schematic diagrams of S42 and S43 in the present invention; Figure 5 The operation schematic diagram of S44 in the present invention; Figure 6 The operation schematic diagram of S45 in the present invention; Figure 7 The operation schematic diagram of S5 in the present invention.
[0017] In the reference signs: 1. T3 support; 2. T4 support; 3. Shielding support; 4. Ordinary support. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] The present invention will be further described below in conjunction with the drawings and embodiments.
[0019] Embodiment 1 When using the process of this technical solution, the steps are as follows: SI: Preliminary preparation Before withdrawing the gob-side support 3, the mine party shall carry out bolt-net + single prop + interlocked crib support at the T3 support 1, T4 support 2 and gob-side support 3, and at the same time complete the withdrawal work of the trough conveyor. S2: Withdrawal of the T3 support 1 S21: Lower the liquid supply of the T3 support 1. Before lowering the liquid supply of the T3 support 1, first conduct a comprehensive inspection of the liquid supply system of the support, including whether the connections of each pipeline are firm, whether the valves open and close flexibly, and whether the hydraulic oil is sufficient and clean, to ensure the normal operation of the liquid supply system; during the process of lowering the liquid supply, arrange a special person to observe the movement of each component of the support. If any abnormality is found, immediately stop the operation and troubleshoot the problem. S22: Use the linkage of the self-propelling oil cylinder and the floor-raising oil cylinder of the support to make the support crawl to the withdrawal passage position. When using the linkage of the self-propelling oil cylinder and the floor-raising oil cylinder of the support to make the support crawl to the withdrawal passage position, lay steel plates in advance on the crawling path of the support to increase the friction between the support and the floor, and prevent the support from slipping during the crawling process. S23: Use a 55-ton scraper loader to tow the T3 support 1 to the loading point in the belt conveyor gate. When using a 55-ton scraper loader to tow the T3 support 1 to the loading point in the belt conveyor gate, the driver of the scraper loader has received professional training and has the corresponding qualifications. Before towing, conduct a comprehensive inspection of the braking, steering and hydraulic systems of the scraper loader to ensure good vehicle performance; during the towing process, use a special bundling device to fix between the support and the scraper loader, with no less than 5 bundling points. At the same time, arrange a special person to monitor on both sides of the support and around the scraper loader to ensure unobstructed towing route. S3: Withdrawal of the T4 support 2 S31: Lower the liquid supply of the T4 support 2. S32: Use the linkage of the self-propelling oil cylinder and the floor-raising oil cylinder of the support to make the support crawl to the withdrawal passage position. S33: Use a 55-ton scraper loader to tow the T4 support 2 to the loading point in the belt conveyor gate. S4: Step-by-step forward movement and step-by-step removal of the gob-side support 3 S41: Move the three groups of gob-side supports 3 forward in a step-by-step manner so that the first group of gob-side supports 3 moves forward to the position of the T4 support 2. When the three groups of gob-side supports 3 move forward in a step-by-step manner, use the laser rangefinder installed on the support to monitor the distance between adjacent two groups of supports in real time, and use the inclination sensors installed on the top and bottom of the support to monitor the inclination state of the support in real time. Once the inclination angle exceeds the range, immediately stop the forward movement operation, and correct the deviation by adjusting the support's support oil cylinder or taking auxiliary support measures to ensure the stability of the support during the movement. S42: Dismantle the push cylinder and the tension cylinder connected to the first and second groups, and use a 55-ton shovel to remove the first group of rock retaining brackets 3. Before dismantling the push cylinder and the tension cylinder connected to the first and second groups, first release the pressure of the cylinder, and use a special pressure relief tool to slowly reduce the pressure in the cylinder to zero; during the dismantling process, use appropriate disassembly tools to prevent damage to the cylinder and connecting parts; after the dismantling is completed, clean, inspect, and mark the cylinder and connecting parts for subsequent installation; S43: the remaining two groups of rock retaining brackets 3 are moved forward in a stepping manner, so that the third group of rock retaining brackets 3 is moved forward to the position of the T4 bracket 2; S44: dismantle the push cylinder and the tension cylinder connected to the second and third groups, and use a 55-ton shovel to remove the second group of rock retaining brackets 3; S45: Continue to complete the withdrawal of the third group of rock retaining supports 3. At this point, the rock retaining supports 3 are withdrawn. When continuing to complete the withdrawal of the third group of rock retaining supports 3, the withdrawal method is the same as the withdrawal method of the first and second groups of rock retaining supports 3. Before withdrawing the third group of rock retaining supports 3, check the withdrawal channel again to ensure that there is no debris or water in the channel, and the roof support is intact. After the withdrawal is completed, the entire withdrawal area is fully cleaned, and the disassembled oil cylinders and connectors are promptly transported to the designated location for storage; S5; Place two general frames 4 on the working surface to support the top plate at the original positions of T4 support 2 and T3 support 1. Before placing the general frames 4, conduct a comprehensive inspection of the structural integrity and hydraulic system of the general frames 4 to ensure the normal operation of the general frames 4; during the placing process, use special lifting equipment, and select the lifting point at the designed lifting position of the general frames 4. The lifting process is smooth and slow. After the general frames 4 are accurately placed at the predetermined position, immediately level and fix the general frames 4, and connect the hydraulic system of the general frames 4 to the tunnel fluid supply system to ensure that the general frames 4 can provide effective support in time. After the general frames 4 are installed and connected to the tunnel fluid supply system, the sealing performance of the general frames 4 is tested.
[0020] In the figure, the T1, T2, T3, T4 and other supports are arranged in order from left to right. The left side of the T1 support is the rubber transport chute; the top of the T3 support 1 and the T4 support 2 is the main withdrawal channel.
Claims
1. The technology for withdrawing the gob-side entry retaining gangue hydraulic support is characterized in that The steps are as follows: SI: Preliminary preparation Before withdrawing the rock-blocking support (3), the mine owner shall carry out anchor net + single body + interlocking wood pile support at the T3 support (1), T4 support (2) and the rock-blocking support (3), and complete the withdrawal of the slot transfer machine at the same time; S2: T3 support (1) retracement S21: lowering the T3 support (1) with liquid supply; S22: Using the support's own pushing cylinder and the bottom lifting cylinder to work together, the support crawls to the position of the withdrawal channel; S23: Use a 55-ton forklift to drag the T3 bracket (1) to the rubber transport chute for loading; S3: T4 support (2) retracement S31: lowering the T4 support (2) with liquid supply; S32: Using the support's own pushing cylinder and the bottom lifting cylinder to work together, the support crawls to the position of the withdrawal channel; S33: Use a 55-ton forklift to drag the T4 bracket (2) to the rubber transport chute for loading; S4: The rock retaining support (3) moves forward and withdraws in steps S41: the three groups of rock retaining supports (3) are moved forward in a stepping manner, so that the first group of rock retaining supports (3) is moved forward to the position of the T4 support (2); S42: dismantle the push cylinder and the tension cylinder connected to the first and second groups, and remove the first group of rock retaining brackets (3) using a 55-ton shovel; S43: the remaining two groups of rock retaining supports (3) are moved forward in a stepping manner, so that the third group of rock retaining supports (3) is moved forward to the position of the T4 support (2); S44: dismantle the push cylinder and the tension cylinder connected to the second and third groups, and remove the second group of rock retaining brackets (3) using a 55-ton shovel; S45: Continue to complete the withdrawal of the third group of rock retaining brackets (3), and the withdrawal of the rock retaining brackets (3) is now completed; S5: Place two working surface general frames (4) at the original T4 support (2) and T3 support (1) positions to support the roof.
2. The gob-side entry retaining rib hydraulic support withdrawal process according to claim 1, characterized in that: In step S21, before the T3 support (1) is lowered, the support's liquid supply system is first comprehensively checked, including whether the pipe connections are secure, whether the valves open and close flexibly, and whether the hydraulic oil is sufficient and clean, to ensure the normal operation of the liquid supply system. During the liquid supply lowering process, a dedicated person is arranged to observe the movement of each component of the support. If any abnormality is found, the operation is stopped immediately and the fault is checked.
3. The gob-side entry retaining gangue hydraulic support withdrawal process according to claim 1, characterized in that: In step S22, when the bracket crawls to the withdrawal channel position by utilizing the bracket's own pushing cylinder and the bottom lifting cylinder, a steel plate is laid on the bracket's crawling path in advance to increase the friction between the bracket and the bottom plate to prevent the bracket from slipping during the crawling process.
4. The gob-side entry retaining gangue hydraulic support withdrawal process according to claim 1, characterized in that: In step S23, when a 55-ton forklift truck is used to tow the T3 support (1) to the rubber transport chute for loading, the forklift truck driver shall be professionally trained and have the corresponding qualifications. Before towing, the forklift truck shall be fully inspected for brake, steering and hydraulic systems to ensure that the vehicle is in good performance. During the towing process, a special binding device shall be used to fix the support and the forklift truck, with no less than 5 binding points. At the same time, a special person shall be arranged to monitor the two sides of the support and the area around the forklift truck to ensure that the towing route is unobstructed.
5. The gob-side entry retaining gangue hydraulic support withdrawal process according to claim 1, characterized in that: In step S41, when the three groups of gangue retaining supports (3) are advanced in a stepped manner, the distance between adjacent two groups of supports is monitored in real time by a laser rangefinder installed on the support, and the inclination state of the support is monitored in real time by inclination sensors installed at the top and bottom of the support. Once the inclination angle exceeds the range, the forward movement operation is immediately stopped, and the deviation is corrected by adjusting the support hydraulic cylinder or taking auxiliary support measures to ensure the stability of the support during the movement.
6. The gob-side entry retaining gangue hydraulic support withdrawal process according to claim 1, characterized in that: In step S42, before disassembling the push cylinder and the tension cylinder connecting the first group and the second group, first release the pressure of the cylinder. Use a special pressure relief tool to slowly reduce the pressure in the cylinder to zero. During the disassembly process, use appropriate disassembly tools to prevent damage to the cylinder and connecting components. After disassembly, clean, inspect the cylinder and connecting components, and make marks for subsequent installation.
7. The gob-side entry retaining gangue hydraulic support withdrawal process according to claim 1, characterized in that: In step S45, when continuing to complete the removal of the third group of gangue retaining supports (3), the removal method is the same as that of the first group and the second group of gangue retaining supports (3). Before removing the third group of gangue retaining supports (3), recheck the withdrawal passage to ensure that there is no debris, no accumulated water, and the roof support is intact. After the removal is completed, comprehensively clean the entire withdrawal area, and timely transport the disassembled cylinders and connectors to the designated location for storage.
8. The gob-side entry retaining rib hydraulic support withdrawal process according to claim 1, characterized in that: In step S5, before steadily placing the ordinary support (4), comprehensively check the structural integrity and hydraulic system of the ordinary support (4) to ensure the normal operation of the ordinary support (4). During the steady placement process, use special lifting equipment, and select the lifting point at the designed lifting position of the ordinary support (4). The lifting process is stable and slow. After accurately placing the ordinary support (4) at the predetermined position, immediately level and fix the ordinary support (4), and connect the hydraulic system of the ordinary support (4) to the roadway liquid supply system to ensure that the ordinary support (4) can provide effective support in a timely manner.
9. The gob-side entry retaining rib hydraulic support withdrawal process according to claim 1, characterized in that: In step S5, after the ordinary support (4) is installed and connected to the roadway liquid supply system, detect the sealing performance of the ordinary support (4).