The withdrawal method of the rock-blocking support in the fully-mechanized mining working face along the gob-retaining lane

Abstract

The present invention provides a method for withdrawing a rock-blocking support in a fully-mechanized mining face along the goaf. The withdrawal method comprises: when the fully-mechanized mining face is advanced to the first preset distance from the stop mining line, a top net is laid in front of the end support, the transition support and the basic support; during the mining process, after each coal cutter is stopped, anchor cables and / or anchor rods are driven between each end support until they are connected with the withdrawal channel; anchor cables and / or anchor rods are driven between each transition support, between adjacent end support and transition support members, and between adjacent transition support and the basic support; wood piles are driven behind the transition support adjacent to the basic support to isolate the goaf; bracing columns are driven behind the rock-blocking support to isolate the goaf; the rock-blocking support is moved into the drift, and the flexible formwork concrete wall in the space to be poured is cast; the rock-blocking support is transported out of the drift to complete the withdrawal. The present invention solves the problem in the prior art that the rock-blocking support in the fully-mechanized mining face along the goaf cannot be withdrawn quickly and safely.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, and in particular to a method for withdrawing a gangue retaining support in a fully-mechanized mining working face along a goaf. Background Art

[0002] At present, in order to reduce the loss of coal pillars between the two tunnels of the working face, pillar-free mining, namely, goaf-retaining technology, is used as one of the common means to improve coal recovery rate. From the 1970s to the present, the development of goaf-retaining technology has experienced dense supports, gangue piles, masonry wall methods, and now the more widely used soft film grouting support technology. It can be said that the development trend of goaf-retaining technology in my country will become increasingly obvious.

[0003] The soft film grouting support technology refers to building a fiber flexible mold bag at the reserved tunnel location, using a concrete pump to fill the high-fluidity filling material mixture into the soft mold bag, forming a high-strength, high-stability, and fast-acting continuous wall support structure, which achieves the purpose of fast tunnel retention speed, small tunnel deformation, and easy maintenance. Before grouting, the reserved tunnel construction location is generally supported by wooden stomp walls or self-moving rock retaining supports. At present, the reserved wooden stomp support wall is less used due to its non-recyclable disadvantages, which reduces the material recovery rate and increases the cost of coal mines. The self-moving rock retaining support is widely promoted due to its high support strength, low labor intensity, high degree of mechanization, and high safety.

[0004] While the rock-blocking support brings convenience to the gob-side tunnel-retaining working face, it also brings certain difficulties to the retreat of the working face. Since the gob-side tunnel-retaining is close to the goaf of the working face, the roof is not easy to maintain. If the roof cannot be maintained and the rock-blocking support cannot be quickly withdrawn during the retreat, it is very easy to cause the rock-blocking support to be crushed and difficult to withdraw. How to ensure the stability of the roof while quickly withdrawing the rock-blocking support has become the focus and main risk point of the retreat of the gob-side tunnel-retaining working face.

[0005] As can be seen from the above, there is a problem in the prior art that the rock retaining support of the fully-mechanized mining working face along the goaf cannot be withdrawn quickly and safely. Summary of the invention

[0006] The main purpose of the present invention is to provide a method for withdrawing a rock retaining support in a fully-mechanized mining working face along a goaf-retaining lane, so as to solve the problem in the prior art that the rock retaining support in a fully-mechanized mining working face along a goaf-retaining lane cannot be withdrawn quickly and safely.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a method for withdrawing a rock-blocking support in a fully-mechanized mining face along an empty goaf, comprising: step S1: when the fully-mechanized mining face is advanced to a first preset distance from a stop mining line, a top net is laid in front of the end support, the transition support and the basic support; step S2: during the mining process, after each coal cutter is stopped, anchor cables and / or anchor rods are driven between the end supports until they are connected with a withdrawal channel; step S3: anchor cables and / or anchor rods are driven between the transition supports, between adjacent end supports and transition support members, and between adjacent transition supports and the basic supports; step S4: a wood pile is driven behind the transition support adjacent to the basic support to isolate the goaf; step S5: a bracing column is driven behind the rock-blocking support to isolate the goaf; step S6: the rock-blocking support is moved into the chute, and a flexible formwork concrete wall is cast in the space to be cast; step S7: the rock-blocking support is transported out of the chute to complete the withdrawal.

[0008] Furthermore, in step S1, the laying distance of the top mesh is the sum of the maximum horizontal length of the rock retaining support and the maximum empty top distance allowed by the fully mechanized mining working face.

[0009] Furthermore, the end bracket includes a first end bracket and a second end bracket, and the transition bracket includes a first transition bracket, a second transition bracket and a third transition bracket. In step S3, an anchor cable is laid between the second end bracket and the first transition bracket; an anchor cable and an anchor rod are laid between the first transition bracket and the second transition bracket and between the second transition bracket and the third transition bracket; and an anchor cable is laid between the third transition bracket and the basic bracket.

[0010] Furthermore, there are multiple anchor cables between the second end bracket and the first transition bracket, and between the third transition bracket and the basic bracket, and the multiple anchor cables are arranged at equal intervals; and / or there are multiple anchor cables and anchor rods between the first transition bracket and the second transition bracket, and between the second transition bracket and the third transition bracket, and the multiple anchor cables and multiple anchor rods are arranged in an alternating manner.

[0011] Furthermore, step S3 also includes: installing anchor cables and anchor rods behind the first transition bracket.

[0012] Furthermore, step S4 also includes: when the comprehensive mining working face advances to a second preset distance from the stop mining line, setting up a wood pile.

[0013] Furthermore, step S4 also includes: before constructing the wood pile, constructing a bracing column behind a transition support adjacent to the basic support.

[0014] Furthermore, in step S4, the bracing columns are installed in such a manner that one bracing column is installed for each step distance of mining.

[0015] Furthermore, step S5 also includes: in the last cycle before the comprehensive mining face stops mining, a supporting column is set behind the rock-blocking support.

[0016] Further, in step S6, moving the rock retaining support into the chute and casting the flexible formwork concrete wall in the space to be cast includes: moving the rock retaining support laterally into the chute, and then casting the flexible formwork concrete wall in the space to be cast.

[0017] Furthermore, in step S6, moving the rock retaining support into the drift and casting the flexible formwork concrete wall in the space to be cast includes: moving the rock retaining support forward to the coal wall of the comprehensive mining working face, casting the flexible formwork concrete wall in the space to be cast, and then moving the rock retaining support laterally into the drift.

[0018] By applying the technical scheme of the present invention, the self-bearing capacity of the roof surrounding rock is actively strengthened and the passive resistance is applied to reduce the displacement of the roof by utilizing the support method of "top net + anchor cable anchor rod + bracing column + wood pile", and the roof in the withdrawal area is pre-controlled in advance, so that the influence of roof sinking during the withdrawal process is effectively controlled in advance, and the situation that the rock retaining support is crushed to death due to the pressure during the withdrawal process is avoided. At the same time, the empty top distance is reduced by using flexible formwork concrete wall support, and the rapid withdrawal of the rock retaining support is realized. In addition, the above-mentioned support method can effectively support the rear of the rock retaining support, and avoid the rock retaining support from collapsing due to lack of support at the rear after the rock retaining support moves forward, reducing the damage to the rock retaining support, ensuring the safe withdrawal of the rock retaining support, and solving the problem that the rock retaining support of the comprehensive mining working face along the empty lane in the prior art cannot be withdrawn quickly and safely. In addition, the roof control creates good working conditions and environment for the subsequent withdrawal of the comprehensive mining working face, and has extremely strong universal application value for the efficient continuation of mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A flow chart showing a method for withdrawing a rock retaining support in a fully-mechanized mining working face along a goaf-retaining lane in a specific embodiment of the present invention; and

[0021] Figure 2 A schematic diagram showing a method for withdrawing a gangue retaining support in a fully-mechanized mining working face along a goaf in the first embodiment of the present invention is shown;

[0022] Figure 3 A schematic diagram of a method for withdrawing a rock-blocking support in a fully mechanized mining working face along a goaf-retaining lane in the second embodiment of the present invention is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Comprehensive mining working face; 20. End support; 21. First end support; 22. Second end support; 30. Transition support; 31. First transition support; 32. Second transition support; 33. Third transition support; 40. Basic support; 50. Top net; 60. Anchor cable; 70. Anchor rod; 80. Withdrawal channel; 90. Wood pile; 100. Gangue retaining support; 110. Bracing column; 120. Chute; 130. Flexible formwork concrete wall; 140. Transfer machine; 150. Scraper conveyor. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0027] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0028] Obviously, the above-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 ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] In order to solve the problem in the prior art that the rock retaining support of a fully-mechanized mining working face along the goaf-retaining lane cannot be withdrawn quickly and safely, the present invention provides a method for withdrawing the rock retaining support of a fully-mechanized mining working face along the goaf-retaining lane.

[0030] Embodiment 1

[0031] like Figure 1As shown, the method for withdrawing the gangue-blocking support of the fully-mechanized mining working face along the goaf-retaining lane comprises: step S1: when the fully-mechanized mining working face 10 is advanced to the first preset distance from the stop mining line, a top net 50 is laid in front of the end support 20, the transition support 30 and the basic support 40; step S2: during the mining process, after each coal cutter is stopped, an anchor cable 60 and / or an anchor rod 70 is driven between each end support 20 until it is connected with the withdrawal channel 80; step S3: between each transition support 30, and between adjacent end support 20 and transition support 30. And anchor cables 60 and / or anchor rods 70 are installed between adjacent transition supports 30 and basic supports 40; Step S4: A wood pile 90 is installed behind the transition support 30 adjacent to the basic support 40 to isolate the goaf; Step S5: A support column 110 is installed behind the slag retaining support 100 to isolate the goaf; Step S6: Move the slag retaining support 100 into the chute 120, and cast the flexible formwork concrete wall 130 in the space to be cast; Step S7: Transport the slag retaining support 100 out of the chute 120 to complete the withdrawal.

[0032] By using the support method of "top net + anchor cable anchor rod + bracing column + wood pile" to actively strengthen the self-bearing capacity of the roof surrounding rock and passively apply resistance to reduce the displacement of the roof, the roof in the withdrawal area is pre-controlled in advance, so that the influence of roof sinking during the withdrawal process is effectively controlled in advance, avoiding the crushing of the rock retaining support 100 due to the pressure during the withdrawal process. At the same time, the flexible formwork concrete wall 130 is used to support and reduce the empty top distance, so that the rapid withdrawal of the rock retaining support 100 is achieved. In addition, the above The supporting method can effectively support the rear of the rock retaining support 100, avoid the rock retaining support 100 from collapsing due to lack of support at the rear after moving forward, reduce the damage of the rock retaining support 100, ensure the safe withdrawal of the rock retaining support 100, and thus realize the rapid and safe withdrawal of the rock retaining support along the goaf-retaining lane in the comprehensive mining working face. In addition, the roof control creates good working conditions and environment for the subsequent withdrawal of the comprehensive mining working face 10, and has extremely strong universal application value for the efficient continuation of mines.

[0033] It should be noted that the transverse direction in this embodiment is a direction parallel to the fully mechanized mining face 10, and the longitudinal direction is a direction perpendicular to the fully mechanized mining face 10, that is, the extension direction of the drift 120. The front and rear directions are relative to the fully mechanized mining face 10, the direction close to the fully mechanized mining face 10 is the front, and the direction away from the fully mechanized mining face 10 is the rear.

[0034] It can be understood that the anchor cables 60, anchor rods 70, wood piles 90 and bracing columns 110 in this embodiment are all started to be installed when the fully-mechanized mining face 10 advances to the first preset distance from the stop mining line, and are installed at intervals as the fully-mechanized mining face 10 advances, thereby forming a longitudinal row arrangement until the fully-mechanized mining face 10 reaches the stop mining line. Figure 2 shown.

[0035] In this embodiment, in step S1 , the laying distance of the top mesh 50 is the sum of the maximum horizontal length of the rock-retaining support 100 and the maximum empty top distance allowed by the fully mechanized mining working face 10 .

[0036] In this embodiment, the top mesh 50 may be a nylon mesh or a metal mesh.

[0037] In this embodiment, the end bracket 20, the transition bracket 30 and the basic bracket 40 form a hydraulic bracket. The end bracket 20, the transition bracket 30 and the basic bracket 40 are all multiple. Specifically, Figure 2 As shown, the end bracket 20 includes a first end bracket 21 and a second end bracket 22, and the transition bracket 30 includes a first transition bracket 31, a second transition bracket 32 ​​and a third transition bracket 33. According to the different requirements for the support and top protection of the location, the combination of the anchor cable 60 and the anchor rod 70 installed between each bracket is different. In step S3, the anchor cable 60 is installed between the second end bracket 22 and the first transition bracket 31. The anchor cable 60 and the anchor rod 70 are installed between the first transition bracket 31 and the second transition bracket 32, and between the second transition bracket 32 ​​and the third transition bracket 33. The anchor cable 60 is installed between the third transition bracket 33 and the basic bracket 40. Through the above arrangement, the top protection is achieved.

[0038] In this embodiment, there are multiple anchor cables 60 between the second end bracket 22 and the first transition bracket 31 and between the third transition bracket 33 and the basic bracket 40, and the multiple anchor cables 60 are arranged at equal intervals.

[0039] In this embodiment, there are multiple anchor cables 60 and multiple anchor rods 70 between the first transition bracket 31 and the second transition bracket 32 ​​and between the second transition bracket 32 ​​and the third transition bracket 33, and the multiple anchor cables 60 and the multiple anchor rods 70 are staggered.

[0040] In this embodiment, step S3 further includes: installing an anchor cable 60 and an anchor rod 70 behind the first transition bracket 31 .

[0041] In this embodiment, step S4 also includes: when the fully mechanized mining face 10 advances to a second preset distance from the stop mining line, setting up a wood pile 90 .

[0042] In this embodiment, step S4 further includes: before constructing the wood pile 90 , constructing a bracing column 110 behind the transition support 30 adjacent to the basic support 40 .

[0043] In this embodiment, in step S4, the buttress pillars 110 are installed in a manner of installing one buttress pillar 110 for each step of mining.

[0044] In this embodiment, step S5 also includes: in the last cycle before the comprehensive mining face 10 stops mining, a support column 110 is installed behind the rock-blocking support 100 .

[0045] In this embodiment, in step S6, moving the rock retaining support 100 into the chute 120 and casting the flexible formwork concrete wall 130 in the space to be cast includes: moving the rock retaining support 100 laterally into the chute 120, and then casting the flexible formwork concrete wall 130 in the space to be cast.

[0046] The following is a specific explanation of the withdrawal method of this application using a specific coal mine comprehensive mining work.

[0047] In this embodiment, the first preset distance is 30m, and the second preset distance is 27m. That is to say, when the comprehensive mining working face 10 is advanced to 30m from the stop mining line, a nylon mesh is laid on the top plate in front of the end support 20, the transition support 30 and the basic support 40, and the specification of the nylon mesh is 10000mm*10000mm. The first roll of the net begins to be laid between the frames and fixed on the top plate with anchor cables; 10m is laid along the inclination of the comprehensive mining working face 10, and 30m is laid along the direction of the comprehensive mining working face 10. The edge of the nylon mesh overlaps the steel mesh in the lane by no less than 0.2m, and is connected with spacers. After the withdrawal channel 80 is connected, the nylon mesh overlaps the top mesh in the withdrawal channel 80 and is connected with spacers.

[0048] At the same time, anchor cables 60 and anchor rods 70 are installed between the supports to protect the roof. Figure 2 As shown, an anchor cable 60 is set between the second end bracket 22 and the first transition bracket 31, wherein the spacing between two adjacent anchor cables 60 is 1.6m. Anchor cables 60 and anchor rods 70 are set between the first transition bracket 31 and the second transition bracket 32, and between the second transition bracket 32 ​​and the third transition bracket 33, wherein the anchor cables 60 and anchor rods 70 are staggered and arranged at equal intervals, and the spacing between two adjacent anchor cables 60 and two adjacent anchor rods 70 is 1.6m. Anchor cables 60 are set between the third transition bracket 33 and the adjacent basic bracket 40, wherein the spacing between two adjacent anchor cables 60 is 0.8m. The row spacing between the above four rows of anchor cables 60 (anchor rods 70) is 1.75m.

[0049] In this embodiment, the anchor cable 60 has a diameter of Φ22×6500 mm; the anchor rod 70 is a threaded steel anchor rod with a diameter of Φ18×2100 mm; and the resin anchoring agent has a specification of CK2350.

[0050] Next, a row of anchor cables 60 and anchor rods 70 are installed behind the first transition support 31 for roof reinforcement. The anchor cables 60 and anchor rods 70 are staggered and arranged at equal intervals, and the distance between two adjacent anchor cables 60 and two adjacent anchor rods 70 is 1.6 m.

[0051] When the comprehensive mining face 10 is advanced to 27m from the stop mining line, a support column 110 is installed behind the third transition support 33 in the manner of installing one support column 110 for each step of back mining. Then, a wood pile 90 is installed under the cover of the support column 110 to isolate the goaf. Among them, the support column 110 is installed with a single pillar and short sleepers, and the angle between it and the bottom plate of the comprehensive mining face 10 is about 82°. The wood pile 90 is installed with sleepers with a specification of 120mm*120mm*1500mm, and a total of 12 are installed.

[0052] In the last cycle before the comprehensive mining face 10 stops mining, a support column 110 is set behind the rock-blocking support 100. The support columns 110 set here are multiple, and multiple support columns 110 are arranged at intervals in the longitudinal direction to create conditions for the lateral movement of the rock-blocking support 100.

[0053] Figure 2 The two rock retaining supports 100 shown are two positions of the rock retaining support 100. The arrow represents the moving direction of the rock retaining support 100. The moving direction of the rock retaining support 100 is to move horizontally from the rear of the transition support 30 to the inside of the chute 120.

[0054] The rock-blocking support 100 is moved out laterally into the tunnel for disassembly and transportation. In the present embodiment, the rock-blocking support 100 includes 6 units arranged in 2 rows in the horizontal direction. The top beam and the base are connected as a unit through columns and transported out. The top beam and the base are balanced and fixed by anchor chains or wire ropes to ensure safe transportation. Among them, a row of units close to the goaf side are marked as 1# frame, 2# frame and 3# frame in the direction away from the comprehensive mining working face; a row of units close to the goaf side are marked as 4# frame, 5# frame and 6# frame in the direction away from the comprehensive mining working face. Specifically, the rock-blocking support 100 itself has a lateral movement function. The 1# frame is used to push the 2# frame out through the frame pulling jack, and the 2# frame is used to pull the 1# frame back, and the cycle is repeated until all units of the rock-blocking support 100 are moved to the position in the tunnel. When the rock retaining support 100 is being moved out laterally, if the one-beam and four-column unit affects the rock retaining support 100, it can be replaced to ensure that there are always at least two units of the scaffolding. After the rock retaining support 100 is transported away, the one-beam and four-column unit is supplemented according to the design requirements.

[0055] After the rock-blocking support 100 is removed, the flexible concrete wall 130 in the space to be cast is cast in a centralized manner. The space to be cast is the space behind the transition support 30. The minimum top control distance is retained after the casting from the transition support 30. After the casting work is completed, the equipment of the comprehensive mining face is withdrawn and the final closure work is carried out according to the finishing measures. In other words, the transfer machine 140, the scraper conveyor 150, the end support 20, the transition support 30, the basic support 40 and other equipment are withdrawn to the chute 120 in sequence.

[0056] Embodiment 2

[0057] The difference between this embodiment and the first embodiment lies in the specific operation sequence in step S6.

[0058] like Figure 3 As shown, in this embodiment, in step S6, the rock retaining support 100 is moved into the chute 120 and the flexible formwork concrete wall 130 in the space to be cast includes: moving the rock retaining support 100 forward to the coal wall of the comprehensive mining working face 10, casting the flexible formwork concrete wall 130 in the space to be cast, and then moving the rock retaining support 100 horizontally into the chute 120.

[0059] Specifically, the rock-blocking support 100 is located behind the second transition support 32. When the comprehensive mining face 10 is mined to the stop line, the transfer machine 140, the scraper conveyor 150, the first end support 21, the second end support 22, the first transition support 31 and the second transition support 32 are withdrawn to the chute 120 in the order of withdrawal, and then the rock-blocking support 100 is moved forward to the coal wall of the comprehensive mining face 10. Then, the flexible formwork concrete wall 130 in the space to be poured is cast, and the flexible formwork concrete wall 130 is laterally cast immediately behind the rock-blocking support 100, and the exit of the withdrawal channel 80 is guaranteed to retain the minimum top control distance under the premise of ensuring the smooth entry and exit of the transportation equipment.

[0060] According to the integrity of the roof, and on the premise of timely adding anchor cables 60 or anchor rods 70 to maintain the roof, start to withdraw the 1# and 4# frames of the slag retaining support 100. After the 1# and 4# frames of the slag retaining support 100 are withdrawn, a temporary valve group is used to connect the remaining 4 units of the slag retaining support 100, and the temporary valve group is used to continue to move the slag retaining support 100 forward to the coal wall of the comprehensive mining working face 10. The 2# and 5# frames of the slag retaining support 100 are dismantled and withdrawn from the comprehensive mining working face 10 and transported away. Using the above method, the 3# and 6# frames of the slag retaining support 100 are continued to be withdrawn to the chute 120 and transported away. Figure 3 What is shown is a schematic diagram of the 3# frame and the 6# frame of the rock retaining support 100 when they are withdrawn to the chute 120 .

[0061] By disassembling and withdrawing the rock retaining support 100 as described above, in conjunction with reinforced support, a large area of ​​empty top caused by a one-time withdrawal in the traditional method is avoided, the potential safety hazards during the construction process are greatly reduced, and the withdrawal of the rock retaining support 100 can be completed safely, quickly and efficiently.

[0062] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: by utilizing the support method of "top net + anchor cable anchor rod + bracing column + wood pile" to actively strengthen the self-bearing capacity of the top plate surrounding rock and passively apply resistance to reduce the displacement of the top plate, the top plate in the withdrawal area is pre-controlled in advance, so as to effectively control the influence of the top plate sinking during the withdrawal process in advance, avoid the situation where the rock retaining bracket 100 is crushed to death due to the pressure during the withdrawal process, and at the same time, the flexible formwork concrete wall 130 is used to support and reduce the empty top distance, so as to achieve rock retaining. The support 100 can be quickly withdrawn. In addition, the above-mentioned support method can effectively support the rear of the rock-blocking support 100, so as to prevent the rock-blocking support 100 from collapsing due to lack of support at the rear after the rock-blocking support 100 moves forward, thereby reducing the damage of the rock-blocking support 100 and ensuring the safe withdrawal of the rock-blocking support 100, thereby realizing the rapid and safe withdrawal of the rock-blocking support of the comprehensive mining working face along the goaf. In addition, the roof control creates good working conditions and environment for the subsequent withdrawal of the comprehensive mining working face 10, and has extremely strong universal application value for the efficient continuation of mines.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, 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 withdrawing a rock-blocking support in a fully-mechanized mining face along a goaf-retaining lane, characterized in that: include: Step S1: when the fully mechanized mining working face (10) is advanced to a first preset distance from the stop mining line, a top net (50) is laid in front of the end support (20), the transition support (30) and the basic support (40); Step S2: during the mining process, after each coal cutter is stopped, anchor cables (60) and / or anchor rods (70) are installed between the end supports (20) until they are connected with the withdrawal channel (80); Step S3: installing the anchor cable (60) and / or the anchor rod (70) between the transition brackets (30), between adjacent end brackets (20) and the transition brackets (30), and between adjacent transition brackets (30) and the basic bracket (40); Step S4: placing a wood pile (90) behind the transition support (30) adjacent to the basic support (40) to isolate the goaf; Step S5: installing a support column (110) behind the rock blocking support (100) to isolate the goaf; Step S6: moving the rock retaining support (100) into the chute (120), and pouring the flexible formwork concrete wall (130) in the space to be poured; Step S7: The rock retaining support (100) is transported out of the chute (120) to complete the withdrawal.

2. The method for withdrawing the rock-blocking support of the fully-mechanized mining working face along the goaf-retaining lane according to claim 1 is characterized in that: In the step S1, the laying distance of the top net (50) is the sum of the maximum horizontal length of the rock-blocking support (100) and the maximum empty top distance allowed by the fully mechanized mining working face (10).

3. The method for withdrawing the rock-blocking support of the fully-mechanized mining working face along the goaf-retaining lane according to claim 1 is characterized in that: The end bracket (20) includes a first end bracket (21) and a second end bracket (22), and the transition bracket (30) includes a first transition bracket (31), a second transition bracket (32) and a third transition bracket (33). In step S3, The anchor cable (60) is installed between the second end bracket (22) and the first transition bracket (31); The anchor cable (60) and the anchor rod (70) are installed between the first transition bracket (31) and the second transition bracket (32), and between the second transition bracket (32) and the third transition bracket (33); The anchor cable (60) is installed between the third transition support (33) and the basic support (40).

4. The method for withdrawing the rock-blocking support of the fully-mechanized mining working face along the goaf-retaining lane according to claim 3 is characterized in that: There are a plurality of anchor cables (60) between the second end bracket (22) and the first transition bracket (31), and between the third transition bracket (33) and the basic bracket (40), and the plurality of anchor cables (60) are arranged at equal intervals; and / or There are multiple anchor cables (60) and multiple anchor rods (70) between the first transition bracket (31) and the second transition bracket (32), and between the second transition bracket (32) and the third transition bracket (33), and the multiple anchor cables (60) and the multiple anchor rods (70) are arranged in a staggered manner.

5. The method for withdrawing the rock-blocking support of the fully-mechanized mining working face along the goaf-retaining lane according to claim 3 is characterized in that: The step S3 further comprises: The anchor cable (60) and the anchor rod (70) are installed behind the first transition bracket (31).

6. The method for withdrawing the rock-blocking support of a fully-mechanized mining working face along the goaf-retaining lane according to claim 1 is characterized in that: The step S4 further comprises: When the fully mechanized mining working face (10) is advanced to a second preset distance from the stop mining line, the wood pile (90) is built.

7. The method for withdrawing the rock-blocking support of a fully-mechanized mining face along the gob-retaining lane according to claim 1 is characterized in that: The step S4 further comprises: Before the wood pile (90) is erected, the bracing column (110) is erected behind the transition support (30) adjacent to the basic support (40).

8. The method for withdrawing the rock-blocking support of a fully-mechanized mining face along the goaf-retaining lane according to claim 7 is characterized in that: In the step S4, the bracing pillars (110) are installed in a manner of installing one bracing pillar (110) for each step of mining.

9. The method for withdrawing the rock-blocking support in a fully-mechanized mining working face along the goaf-retaining lane according to claim 1 is characterized in that: The step S5 further comprises: In the last cycle before the fully mechanized mining face (10) stops mining, the support column (110) is installed behind the rock-blocking support (100).

10. The method for withdrawing the rock-blocking support in a fully-mechanized mining working face along the goaf-retaining lane according to claim 1 is characterized in that: In the step S6, the step of moving the rock retaining support (100) into the chute (120) and casting the flexible formwork concrete wall (130) in the space to be cast comprises: The rock retaining support (100) is moved transversely into the chute (120), and then the flexible formwork concrete wall (130) in the space to be cast is cast.

11. The method for withdrawing the rock-blocking support in a fully-mechanized mining face along the goaf-retaining lane according to claim 1 is characterized in that: In the step S6, the step of moving the rock retaining support (100) into the chute (120) and casting the flexible formwork concrete wall (130) in the space to be cast comprises: The rock-blocking support (100) is moved forward to the coal wall of the fully mechanized mining working face (10), the flexible formwork concrete wall (130) in the space to be cast is cast, and then the rock-blocking support (100) is moved laterally into the drift (120).

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