Extra-large mining height hydraulic support withdrawing process

Abstract

The invention relates to the technical field of support withdrawing processes, in particular to an ultra-large mining height hydraulic support withdrawing process which comprises the following steps: SI, preparation work; s2, replacing a machine head end bracket; s3, replacing a transition bracket; s4, withdrawing the bracket and carrying out subsequent operation; according to the support withdrawing process, the support with the small size and the light weight is used for replacing an original machine head and machine tail end and a transition support, the difficulty and the operation risk in the support withdrawing and closing-up process are effectively reduced, and the situation that the support is pressed tightly is avoided; by means of the technology, the risk of retracting and closing-up operation of the support can be reduced to the maximum extent, meanwhile, the difficulty is reduced to the minimum, the retracting speed of the hydraulic support is increased, the support is not pressed tightly in the support retracting period, the retracting period can be shortened, and the production cost is reduced; in the withdrawing process, the safety and the stability in the withdrawing process can be ensured through a reasonable support replacement sequence, interlocking wood cribs are erected and round wood supporting columns are erected.

Description

Technical Field

[0001] The present invention relates to the technical field of support withdrawal processes, and particularly to the withdrawal process of hydraulic supports with extra-large mining heights. Background Art

[0002] In fully-mechanized coal mining faces, with the increase in mining depth and mining height, the size and weight of hydraulic supports also continuously increase. Especially in fully-mechanized coal mining faces with extra-large mining heights, the length from the front end of the top beam to the rear end of the rear tail beam of the hydraulic support can reach more than 10 meters, and the weight exceeds 70 tons. Such extra-large size and weight pose great challenges to the support withdrawal work.

[0003] In the traditional withdrawal method, when the support is withdrawn to the head and tail of the working face, due to the long rear tail beam and large weight of the end support, both the length and weight of the support pose great challenges to the retraction and extension work. There is a high possibility of being crushed when the support is withdrawn and closed, bringing great difficulties and risks to the closing work.

[0004] Therefore, aiming at the problems of large withdrawal difficulty and high risk caused by the large size and heavy weight of the above-mentioned hydraulic supports with extra-large mining heights during the withdrawal process, a withdrawal process for hydraulic supports with extra-large mining heights can be designed. Summary of the Invention

[0005] In order to overcome the problems of large withdrawal difficulty and high risk caused by the large size and heavy weight of traditional hydraulic supports with extra-large mining heights during the withdrawal process.

[0006] The technical solution of the present invention is as follows: A withdrawal process for hydraulic supports with extra-large mining heights, and its steps are as follows: S1: Preparation Work Before the support is withdrawn, 10 supports with a length of 5.8 meters, a weight of 40 tons, and a length from the front end of the top beam to the rear end of the rear tail beam of 7.5 meters after lowering are transported into the well from the ground and temporarily stored underground for replacing the original head and tail end supports and transition supports; S2: Replacement of Head End Support S21: First, remove the original No. 2 end support, use a 75-ton scraper loader to transport the 5.8-meter support to the position of the original No. 2 support, supply liquid to adjust the position, and raise it to contact the roof; S22: Replace the remaining original No. 1 end support and original No. 3 end support in the same way; After all the end supports are replaced, raise them all to contact the roof; S3: Replacement of Transition Support S31: Replace the original No. 4 transition support and original No. 5 transition support in sequence; S4: Support Withdrawal and Subsequent Operations S41: Use a winch to withdraw the replaced No. 5 transition support, build an interlocking crib at the original position and set up two round wood columns, and use a winch to pull the five shielding supports into place; S42: Use a winch to remove the replaced No. 4 transition support, set up an interlocking crib at the original position and install two round wooden props, and use the winch to pull the four shielding supports, three shielding supports, auxiliary shielding support and main shielding support into place; S43: Use a winch to remove the five shielding supports; S44: Use a winch to remove the four shielding supports; S45: Use a winch to remove the remaining three shielding supports, auxiliary shielding support and main shielding support, and then use a 75-ton scraper loader to remove the winch; S46: Step by step, arrange the replaced No. 1 end support, No. 2 end support and No. 3 end support to the crossheading; S47: Use a 75-ton scraper loader to transport the No. 2 end support away; S48: Use a 75-ton scraper loader to transport the No. 1 end support and No. 3 end support away. Thus, the support withdrawal at the crossheading is completed.

[0007] Preferably, in step S1, for the 10 sets of 5.8-meter supports lowered into the well from the ground, before being lowered into the well, it is necessary to comprehensively inspect the integrity of each component, the sealing of the hydraulic system and the strength of the structural members to ensure that the supports lowered into the well meet the safety usage standards.

[0008] Preferably, in step S21, before removing the original No. 2 end support, first temporarily support and reinforce the roof around the support, using the method of single hydraulic props combined with steel beams to ensure the safety of the roof in the working space.

[0009] Preferably, in step S31, when successively replacing the original No. 4 transition support and the original No. 5 transition support, before replacement, it is necessary to remove the connecting components between the original transition support and the adjacent supports. During the removal process, use special tools and strictly prohibit violent disassembly; after the new transition support is replaced in place, it is necessary to reinstall the connecting components and ensure that the connection is firm and reliable. At the same time, debug the components of the new support's push jack and side guard plate to ensure its flexible movement; during the process of removing and installing the connecting components, record the removal and installation sequence in detail for convenient subsequent inspection and traceability. When debugging the components, conduct tests according to the debugging procedures to ensure stable performance.

[0010] Preferably, in step S42, during the operation of using a winch to remove the replaced No. 4 transition support and pull the shielding support into place, obvious warning signs shall be set in the roadway, and non-operating personnel are strictly prohibited from entering the operation area; and for each time the support is pulled and moved, it is necessary to check the operation condition of the winch and the moving track of the support to prevent the support from getting stuck or skewed during the pulling and moving process.

[0011] Preferably, the warning signs are set in accordance with relevant safety standards to ensure clear visibility from all angles in the roadway. A written record is made during the inspection process, and the record content includes the inspection time, inspection results, and information of the inspection personnel.

[0012] Preferably, in steps S43 to S45, when using a winch to remove the shield support, before each shield support is removed, first remove the connection devices, pipelines, etc. between it and the surrounding supports completely, and seal the interfaces after removal to prevent foreign objects from entering; after the winch is removed, clean and maintain the roadway where the winch is parked to ensure the roadway is unobstructed; the interface sealing material has good sealing performance and durability. When cleaning and maintaining the roadway, comprehensively clean the accumulated water, floating coal and sundries in the roadway, and at the same time check the roadway support conditions and repair problems in time.

[0013] Preferably, in steps S47 to S48, when using a 75-ton scraper loader to transport the end support, after the scraper loader loads the end support, re-check the fixing condition of the support to ensure that the support will not shake during transportation; and when the scraper loader travels in the gate roadway, keep a safe distance from other equipment and pipelines in the gate roadway to prevent collisions; multiple methods are used for checking the fixing condition, including visually checking whether the fixing parts are loose and using tools to conduct tightening tests on the fixing points. Position signs of equipment and pipelines are set in the gate roadway to remind the scraper loader driver to pay attention to the safe distance.

[0014] Preferably, during the entire support withdrawal process, a perfect safety monitoring system is established to monitor the roof pressure and gas concentration parameters of the roadway in real time. Once the parameters exceed the safety range, immediately start the emergency plan, stop the operation and organize personnel to evacuate. The data of the safety monitoring system are recorded and stored in real time for convenient subsequent analysis. The emergency plan is regularly organized for drills to ensure that the operating personnel are familiar with the emergency process.

[0015] The beneficial effects of the present invention: 1. The support withdrawal process of the present invention replaces the original head and tail end supports and transition supports with supports of smaller size and lighter weight, effectively reducing the difficulty and operation risk during the support withdrawal and closing process, and avoiding the situation where the supports are crushed. During the withdrawal process, through a reasonable support replacement sequence, erection of interlocking cribs, and erection of round wooden props, the safety and stability during the withdrawal process can be ensured. Through this process, the risk of the support withdrawal and closing operation can be minimized, and the difficulty can be reduced to the lowest level, accelerating the withdrawal speed of the hydraulic support. During the support withdrawal period, not only is the support not crushed, but the withdrawal cycle can also be shortened, reducing the production cost. Compared with the traditional withdrawal method, in the case of long rear tail beams and large weights of the head and tail end supports, it is extremely easy to be crushed, resulting in great difficulty and high risk in the closing work. This process greatly reduces the operation difficulty in terms of size and weight. Especially in the underground environment with limited space, it is more convenient for transportation and installation, greatly alleviating the challenges brought by the excessive size and weight of the traditional support to the withdrawal work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The schematic diagram of the original end support and transition support in the ultra-high mining height hydraulic support withdrawal process of the present invention is shown; Figure 2 The schematic diagram of replacing the rear end support and transition support in the present invention; Figure 3 The schematic diagram of the removal operation of the No. 5 transition support in the present invention; Figure 4 The schematic diagram of the operation of S41 in the present invention; Figure 5 The schematic diagram of the removal operation of the No. 4 transition support in the present invention; Figure 6 The schematic diagram of the operation of S42 in the present invention; Figure 7 The schematic diagram of the removal process of the five shield supports in the present invention; Figure 8 The schematic diagram of the completion of the removal of the five shield supports in the present invention; Figure 9 The schematic diagram of the removal process of the four shield supports in the present invention; Figure 10 The schematic diagram of the completion of the removal of the four shield supports in the present invention; Figure 11 The schematic diagram of the operation of S45 in the present invention; Figure 12 The schematic diagram of the operation of S46 in the present invention; Figure 13 The schematic diagram of the removal process of the No. 2 end support in the present invention; Figure 14 The schematic diagram of the completion of the removal of the No. 2 end support in the present invention; Figure 15 Schematic diagram of the operation of S48 in the present invention.

[0017] In the attached drawing reference numerals: 101, original No. 1 end support; 102, No. 1 end support; 201, original No. 2 end support; 202, No. 2 end support; 301, original No. 3 end support; 302, No. 3 end support; 401, original No. 4 transition support; 402, No. 4 transition support; 501, original No. 5 transition support; 502, No. 5 transition support; 6, five-cover support; 7, four-cover support; 8, three-cover support; 9, auxiliary cover support; 10, main cover support; 11, interlocking crib; 12, round log prop; 13, winch; 14, 75-ton scraper loader. Specific embodiments

[0018] The present invention will be further described below in conjunction with the attached drawings and embodiments.

[0019] When using the process of the present technical solution, the steps are as follows: SI: Preparation work Before the support withdrawal, 10 supports with a length of 5.8 meters, a weight of 40 tons, and a length from the end of the roof beam to the end of the rear tail beam of 7.5 meters after lowering are transported into the well from the ground and temporarily stored in the well for replacing the original head and tail end supports and transition supports. In step S1, for the 10 supports with a length of 5.8 meters transported into the well from the ground, the integrity of each component, the sealing of the hydraulic system, and the strength of the structural members need to be comprehensively inspected before entering the well to ensure that the supports entering the well meet the safety use standards; S2: Replacement of the head end support S21: First, remove the original No. 2 end support 201, use the 75-ton scraper loader 14 to transport the 5.8-meter support to the position of the original No. 2 support 201, supply liquid to adjust the position, and raise it to contact the roof. In step S21, before removing the original No. 2 end support 201, the roof around the support is temporarily supported and reinforced first, using the method of single hydraulic props cooperating with steel beams to ensure the safety of the roof in the operation space; S22: Replace the remaining original No. 1 end support 101 and original No. 3 end support 301 in the same way; S23: After all the end supports are replaced, raise them all to contact the roof; S3: Replacement of the transition support S31: Replace the original No. 4 transition support 401 and the original No. 5 transition support 501 in sequence. In step S31, when replacing the original No. 4 transition support 401 and the original No. 5 transition support 501 in sequence, before replacement, the connecting components between the original transition support and the adjacent supports need to be removed. During the removal process, special tools should be used, and violent disassembly is strictly prohibited. After the new transition support is replaced in place, the connecting components need to be reinstalled, and it is ensured that the connection is firm and reliable. At the same time, the push jacks and side guard plates of the new support are debugged to ensure that their actions are flexible. During the process of removing and installing the connecting components, the removal and installation sequences are recorded in detail for convenient subsequent inspection and traceability. When debugging the components, tests are carried out in accordance with the debugging procedures to ensure stable performance. S4: Support withdrawal and subsequent operations S41: Use the winch 13 to remove the replaced No. 5 transition support 502, build an interlocking crib 11 at the original position and set up two round wood pillars 12, and use the winch 13 to pull the five-cover support 6 in place. S42: Use the winch 13 to remove the replaced No. 4 transition support 402, build an interlocking crib 11 at the original position and set up two round wood pillars 12, and use the winch 13 to pull the four-cover support 7, the three-cover support 8, the auxiliary cover support 9, and the main cover support 10 in place. In step S42, during the operation of using the winch 13 to remove the replaced No. 4 transition support 402 and pulling the cover supports in place, obvious warning signs need to be set in the roadway, and non-operating personnel are strictly prohibited from entering the operation area. And every time a support is pulled, the running condition of the winch 13 and the moving track of the support need to be checked to prevent the support from getting stuck or skewed during the pulling process. The warning signs are set in line with relevant safety standards to ensure that they are clearly visible from all angles in the roadway. The inspection process is recorded in writing, and the record content includes the inspection time, inspection results, and information of the inspection personnel. S43: Use the winch 13 to remove the five-cover support 6. S44: Use the winch 13 to remove the four-cover support 7. S45: Use the winch 13 to remove the remaining three-cover support 8, the auxiliary cover support 9, and the main cover support 10, and then use the 75-ton scraper loader 14 to remove the winch 13. In steps S43 to S45, when using the winch 13 to remove the cover supports, before each cover support is removed, first remove the connection devices, pipelines, etc. between it and the surrounding supports completely, and seal the interfaces after removal to prevent sundries from entering. After the winch 13 is removed, the roadway where the winch 13 is parked is cleaned and maintained to ensure the smoothness of the roadway. The interface sealing material has good sealing performance and durability. When cleaning and maintaining the roadway, the accumulated water, floating coal, and sundries in the roadway are comprehensively cleaned, and at the same time, the roadway support condition is inspected, and problems are repaired in time. S46: walking to arrange the replaced 1# end bracket 102, 2# end bracket 202, and 3# end bracket 302 to the slot; S47: Use the 75-ton forklift 14 to transport the 2# end bracket 202 away; S48: Use the 75-ton forklift 14 to transport the 1# end bracket 102 and the 3# end bracket 302 away, and the closing and withdrawing of the brackets is now completed; In steps S47 to S48, when the end bracket is transported by the 75-ton forklift 14, the fixing condition of the bracket is checked again after the forklift is loaded with the end bracket to ensure that the bracket will not shake during transportation; and when the forklift is driving in the chute, it keeps a safe distance from other equipment and pipelines in the chute to prevent collision; the fixing condition is checked in a variety of ways, including visually checking whether the fixing parts are loose, using tools to perform a tightening test on the fixing points, and setting equipment and pipeline position marks in the chute to remind the forklift driver to pay attention to the safe distance; During the entire support withdrawal process, a complete safety monitoring system is established to monitor the tunnel roof pressure and gas concentration parameters in real time. Once the parameters exceed the safety range, the emergency plan is immediately activated, operations are stopped and personnel are organized to evacuate. The data of the safety monitoring system is recorded and stored in real time to facilitate subsequent analysis. Emergency plan drills are organized regularly to ensure that operators are familiar with emergency procedures.

Claims

1. The technology for withdrawing the hydraulic support with extra-large mining height is characterized in that, The steps are as follows: SI: Preparation Before the support is retracted, replace the original head and tail end supports and transition supports; S2: Replacement of the head end support S21: First, remove the original No. 2 end support (201), use a 75-ton scraper loader (14) to transport a 5.8-meter support to the original position of the No. 2 support (201), supply liquid to adjust the position, and raise it to contact the roof; S22: Replace the remaining original No. 1 end support (101) and original No. 3 end support (301) in the same way; S23: After all the end supports are replaced, raise them all to contact the roof; S3: Replacement of the transition support S31: Replace the original No. 4 transition support (401) and original No. 5 transition support (501) in sequence; S4: Support retraction and subsequent operations S41: Use a winch (13) to remove the replaced No. 5 transition support (502), build an interlocking crib (11) at the original position and set up two round wood pillars (12), and use the winch (13) to pull the five-cover support (6) into place; S42: Use a winch (13) to remove the replaced No. 4 transition support (402), build an interlocking crib (11) at the original position and set up two round wood pillars (12), and use the winch (13) to pull the four-cover support (7), three-cover support (8), auxiliary cover support (9) and main cover support (10) into place; S43: Use a winch (13) to remove the five-cover support (6); S44: Use a winch (13) to remove the four-cover support (7); S45: Use a winch (13) to remove the remaining three-cover support (8), auxiliary cover support (9) and main cover support (10), and then use a 75-ton scraper loader (14) to remove the winch (13); S46: Step by step, arrange the replaced No. 1 end support (102), No. 2 end support (202) and No. 3 end support (302) to the crossheading opening; S47: Use a 75-ton scraper loader (14) to transport the No. 2 end support (202) away; S48: Use a 75-ton scraper loader (14) to transport the No. 1 end support (102) and No. 3 end support (302) away. So far, the support retraction at the end is completed.

2. The ultra-high mining height hydraulic support withdrawal process according to claim 1, characterized in that: In step S1, 10 supports with a length of 5.8 meters, a weight of 40 tons, and a length from the front end of the roof beam to the rear end of the tail beam of 7.5 meters after lowering are lowered into the well from the ground and temporarily stored underground for replacing the original head and tail end supports and transition supports. Before the supports are lowered into the well, a comprehensive inspection shall be carried out on the integrity of their various components, the sealing performance of the hydraulic system, and the strength of the structural members to ensure that the supports lowered into the well meet the safety use standards.

3. The ultra-high mining height hydraulic support withdrawal process according to claim 1, characterized in that: In step S21, before removing the original No. 2 end support (201), first temporarily support and reinforce the roof around the support, using the method of single hydraulic props combined with steel beams to ensure the safety of the roof in the operation space.

4. The ultra-high mining height hydraulic support withdrawal process according to claim 1, characterized in that: In step S31, when successively replacing the original No. 4 transition support (401) and the original No. 5 transition support (501), before replacement, the connecting components between the original transition support and the adjacent supports need to be removed. Special tools should be used during the removal process, and violent disassembly is strictly prohibited. After the new transition support is replaced in place, the connecting components need to be reinstalled, and it is ensured that the connection is firm and reliable. At the same time, the push jacks and side guard plates of the new support are debugged to ensure their flexible operation. During the process of removing and installing the connecting components, the removal and installation sequences are recorded in detail for convenient subsequent inspection and traceability. When debugging the components, tests are carried out in accordance with the debugging procedures to ensure stable performance.

5. The ultra-high mining height hydraulic support withdrawal process according to claim 1, characterized in that: In step S42, during the operation of using the winch (13) to remove the replaced No. 4 transition support (402) and pull the shield support in place, obvious warning signs need to be set in the roadway, and non-operating personnel are strictly prohibited from entering the operation area. Moreover, each time a support is pulled, the operating conditions of the winch (13) and the moving track of the support are checked to prevent the support from getting stuck or skewed during the pulling process.

6. The super-high mining height hydraulic support withdrawal process according to claim 5, characterized in that: The setting of the warning signs complies with relevant safety standards to ensure that they are clearly visible from all angles in the roadway. The inspection process is recorded in writing, and the recorded content includes the inspection time, inspection results, and information of the inspection personnel.

7. The ultra-high mining height hydraulic support withdrawal process according to claim 1, characterized in that: In steps S43 to S45, when using the winch (13) to remove the shield support, before each shield support is removed, the connecting devices, pipelines, etc. between it and the surrounding supports are removed completely, and the interfaces after removal are sealed to prevent foreign objects from entering. After the winch (13) is removed, the roadway where the winch (13) is parked is cleaned and maintained to ensure the smoothness of the roadway. The interface sealing material has good sealing performance and durability. When cleaning and maintaining the roadway, the accumulated water, floating coal, and foreign objects in the roadway are comprehensively cleaned, and at the same time, the roadway support conditions are inspected, and problems are repaired in a timely manner.

8. The super-high mining height hydraulic support withdrawal process according to claim 1, characterized in that: In steps S47 to S48, when using the 75-ton scraper loader (14) to transport the end support, after the scraper loader loads the end support, the fixing condition of the support is checked again to ensure that the support will not shake during transportation. Moreover, when the scraper loader travels in the gate roadway, it maintains a safe distance from other equipment and pipelines in the gate roadway to prevent collisions. The inspection of the fixing condition adopts various methods, including visually checking whether the fixing components are loose and using tools to conduct tightening tests on the fixing points. Position signs of the equipment and pipelines are set in the gate roadway to remind the scraper loader driver to pay attention to the safe distance.

9. The ultra-high mining height hydraulic support withdrawal process according to claim 1, characterized in that: During the entire support withdrawal process, a perfect safety monitoring system is established to monitor the roof pressure and gas concentration parameters of the roadway in real time. Once the parameters exceed the safe range, the emergency plan is immediately activated, the operation is stopped, and personnel are organized to evacuate. The data of the safety monitoring system are recorded and stored in real time for convenient subsequent analysis. The emergency plan is regularly rehearsed to ensure that the operating personnel are familiar with the emergency procedures.

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