A method for rapid back-off of T-shaped passageway at working face end mining
By directly forming a T-shaped passage connecting the working face at the end of the mining phase, the problems of large workload, high cost, and long time consumption during equipment retraction were solved, achieving safe and efficient equipment retraction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA UNIV OF MINING & TECH (BEIJING)
- Filing Date
- 2023-04-13
- Publication Date
- 2026-04-10
AI Technical Summary
The existing working face equipment retraction process involves a large amount of roadway engineering, high maintenance costs, and long time consumption, and the instability of coal pillars leads to safety hazards.
The T-shaped channel rapid retreat method is adopted. When the working face is not mined, a channel the width of the hydraulic support is directly connected to the working face from the uphill or main roadway to the middle, forming a T-shaped rapid retreat channel. This avoids pre-excavation and scouring, and uses the protective coal pillar at the end of mining for equipment retreat.
This reduced the amount of roadway engineering, decreased maintenance costs, increased coal extraction rate, shortened retreat time, and ensured the safe and efficient retreat of equipment.
Smart Images
Figure CN116220684B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of coal mining, and in particular to a method for rapid retraction of the T-shaped channel at the end of the working face. Background Technology
[0002] After the longwall face is mined out, the safe and efficient withdrawal of equipment is a critical issue and a key concern for coal enterprises. Currently, the withdrawal process often involves pre-excavating withdrawal channels near the stop line and conducting equipment withdrawal operations within these channels. However, during the connection between the longwall face and the withdrawal channel, coal pillars are prone to instability and failure, leading to safety issues such as coal wall spalling and premature roof breakage, and even accidents like the hydraulic supports being crushed, which is detrimental to the safe and efficient withdrawal of equipment. Furthermore, the pre-planning of withdrawal channels not only significantly increases the amount of roadway excavation work but also substantially raises roadway maintenance costs.
[0003] In summary, existing technologies for withdrawing equipment from the final mining stage of a working face have several drawbacks, including safety issues, large-scale roadway engineering, high maintenance costs, and long processing times, which hinder the safe and efficient withdrawal of equipment from the working face. Summary of the Invention
[0004] To address the aforementioned technical problems, the present invention aims to propose a method for rapid retraction of the T-shaped channel at the end of the working face, thereby solving the problems of large amount of roadway engineering, high cost, and long time consumption in the existing working face equipment retraction.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A method for rapid retraction of the T-shaped passage at the end of the working face includes the following steps:
[0007] a. Before the working face enters the final mining stage, there is no need to pre-excavate the retreat channel or widen the stop line after the final mining.
[0008] b. When the working face is not mined, conventional measures such as hanging ropes and laying nets are used to control the roof. At the same time, a channel with the width of 2 to 3 hydraulic supports is excavated from the uphill or main roadway to the middle of the working face to directly connect with the working face, forming a T-shaped rapid retreat channel.
[0009] c. By utilizing the T-shaped rapid retreat channel excavated in the unmined protective coal pillar, the hydraulic supports arranged on the working face can be loaded and transported directly from the middle channel of the working face in sequence, so as to realize the rapid relocation and retreat of the working face.
[0010] The method described according to the present invention is preferably applicable to the rapid retreat of equipment at the end of mining operations in working faces without pre-excavated retreat channels, thereby realizing the rapid retreat of equipment in T-shaped channels.
[0011] Specifically, in step a, before the working face enters the final mining stage, no single or double retreat passage needs to be pre-excavated near the stop line, and no brush expansion treatment is needed for the working face after the final mining to widen the space of the working face for the convenience of equipment retreat.
[0012] In step b, when the working face is in the final mining stage, the conventional measures of hanging ropes and laying nets are taken to control the roof, 2-3 hydraulic support width passages are excavated from the upraise or main roadway to the middle of the working face, and are directly connected with the working face, support measures are taken for the excavated passages to form a T-shaped rapid retreat passage.
[0013] In step c, the T-shaped rapid retreat passage is used to retreat the hydraulic support arranged in the working face from the middle to the outside, and the purpose of rapid retreat from the middle of the working face to the target location is achieved.
[0014] The implementation method provided by the present application has the following advantages:
[0015] (1) The working face does not need to be specially arranged with a retreat passage and does not need to be brushed and expanded, which reduces the amount of roadway engineering and maintenance cost;
[0016] (2) The T-shaped passage of the working face in the final mining stage is located in the protective coal pillar in the final mining stage, which improves the coal recovery rate, and the area is not affected by mining stress, which is beneficial to the maintenance of the roadway;
[0017] (3) The length of the T-shaped passage of the working face in the final mining stage is usually less than the length of the working face, which shortens the excavation time, reduces the retreat time, and improves the retreat speed. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a schematic diagram of the working face in the final mining stage;
[0019] Figure 2 It is a schematic diagram of the working face in the final mining stage.
[0020] Figure 2 a is a schematic diagram of the working face in the final mining stage
[0021] Figure 2 b is a schematic diagram of the working face in the final mining stage DETAILED DESCRIPTION
[0022] The specific embodiment of the present application is described in combination with the drawings.
[0023] In this embodiment, in the first step, before the working face enters the final mining stage, no retreat passage needs to be pre-excavated or the stop line needs to be brushed and expanded after the final mining.
[0024] Second, the end of the working face, take the rope, laying net and other conventional measures to control the roof, while from the upper or roadway to the middle of the working face excavation 2~3 parts of the hydraulic support width of the channel directly with the working face, forming a T-shaped rapid back channel.
[0025] Third, the use of the end of the protection of the coal pillar excavation T-shaped rapid back channel, can be arranged in the working face of the hydraulic support from the middle of the working face channel directly loaded car transport, in order to achieve the working face rapid relocation back.
Claims
1. A method for rapid back retraction of a T-shaped passageway at the end of mining of a working face, characterized in that, It comprises the following steps: a. Before entering the final mining stage, the working face does not need to excavate a back-off channel in advance, and after the final mining, the working face does not need to be treated by brushing and expanding; b. When the working face is in the final mining stage, the conventional measures of hanging ropes and laying nets are taken to control the roof, and 2-3 channels of hydraulic support width are excavated from the upward slope or the main roadway to the middle of the working face to directly penetrate the working face, forming a T-shaped rapid back-off channel; c. The T-shaped rapid back-off channel excavated in the final mining protective coal pillar can be used to sequentially load and transport the hydraulic supports arranged in the working face from the middle channel of the working face to achieve the purpose of rapid relocation and back-off of the working face.
2. The method for quick retracement of T-shaped passageway at the end of mining of working face according to claim 1, characterized in that, In step a, before entering the final mining stage, the working face does not need to excavate a single or double back-off channel near the stop mining, and after the final mining, the working face does not need to be treated by brushing and expanding to widen the space of the final mining working face.
3. The method of quickly withdrawing the T-shaped passageway at the end of mining of the working face according to claim 1, characterized in that, In step b, when the working face is in the final mining stage, the conventional measures of hanging ropes and laying nets are taken to control the roof, and 2-3 channels of hydraulic support width are excavated from the upward slope or the main roadway to the middle of the working face to directly penetrate the working face, forming a T-shaped rapid back-off channel.
4. The method for quick retracement of T-shaped passageway at the end of mining of working face according to claim 1, characterized in that, In step c, the T-shaped rapid back-off channel formed is used to sequentially load and transport the hydraulic supports arranged in the working face from the middle of the working face to achieve the purpose of rapid relocation and back-off of the working face to the target location.