Gob-side entry retaining prefabricated wall structure and construction method

Abstract

The invention relates to the technical field of coal mining, and provides a gob-side entry retaining prefabricated wall structure and a construction method.The wall structure comprises wall units, splicing faces are arranged on the side portions of the wall units, lock catch structures are arranged on the splicing faces, and the multiple wall units are spliced through the lock catch structures to form a wall; the lock catch structure comprises a male tenon and a female groove which are respectively arranged on the splicing surfaces of the adjacent wall body units, and the male tenons and the female grooves of the adjacent wall body units are embedded; at least part of the wall body units are provided with connecting positions, and the flexible mold bags can be connected with the connecting positions so that the flexible mold bags and the wall body units can be assembled into a whole. Through the arrangement, the wall surfaces of the adjacent wall body units are kept aligned under the constraint of the embedded male tenons and female grooves, subsequent manual adjustment is not needed, and the construction difficulty and workload are reduced; the flexible mold bag installed in advance avoids underground climbing operation, reduces workload, eliminates potential safety hazards caused by the underground climbing operation, and enables construction to be simpler, quicker and safer.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, and in particular to a prefabricated wall structure for retaining a tunnel along a goaf and a construction method. Background Art

[0002] Leaving a tunnel along the goaf is a major way to increase coal recovery rate and implement green mining without coal pillars. It can effectively reduce coal losses and can be used for recovery in the lower section working face. It has many advantages such as reducing tunnel excavation rate, achieving Y-type ventilation, and solving gas accumulation in corners.

[0003] There are two main ways to form the existing goaf-side tunnel wall: one is to cast a concrete wall on site on one side of the goaf; the other is to prefabricate the concrete wall and then place it on one side of the goaf for support. Both methods replace the traditional coal pillar retention, retain the transportation tunnel of the working face, and provide for the recovery of the working face in the next section.

[0004] However, among the above-mentioned related technologies, on-site pouring is limited by underground conditions, with high construction costs and low efficiency, making it difficult to meet the needs of rapid advancement of the working face; while the construction of prefabricated walls along the goaf is difficult, and wall alignment is difficult. At the same time, it is necessary to climb underground to install the top flexible formwork, which increases the workload and poses a safety hazard. Summary of the invention

[0005] The present invention provides a prefabricated wall structure and a construction method for retaining a tunnel along an air space, which are used to solve the defects of the prior art that the prefabricated wall structure is difficult to construct and has potential safety hazards, and has the advantages of being simpler, faster and safer to construct.

[0006] The present invention provides a prefabricated wall structure for retaining a tunnel along a goaf, comprising: A wall unit, wherein a joint surface is provided on the side of the wall unit, and a locking structure is provided on the joint surface, and a plurality of the wall units are joined together by the locking structure to form a wall; the locking structure comprises a male tenon and a female groove respectively provided on the joint surfaces of adjacent wall units, and the male tenons and the female grooves of adjacent wall units are engaged; A flexible mold bag, at least part of the wall unit is provided with a connection position, the flexible mold bag can be connected to the connection position to be assembled into a whole with the wall unit, a plurality of the flexible mold bags are arranged side by side on the top of the wall along the length direction of the wall; a grouting port is provided on the flexible mold bag.

[0007] According to a prefabricated wall structure for retaining tunnels along the goaf provided by the present invention, sealing grooves are provided on the joint surfaces of the wall units, the sealing grooves of adjacent wall units are positioned correspondingly to form a sealing channel, and the flexible mold bag is connected to the sealing channel.

[0008] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, the sealing groove extends from the joint surface to the bottom surface of the wall unit for contacting the ground; The wall unit is provided with a through hole, and the sealing groove at the top of the wall unit and the sealing groove at the bottom are connected through the through hole.

[0009] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, adjacent wall units are fixedly connected by a fixing assembly; the fixing assembly comprises: A fixing plate is simultaneously fitted with two adjacent wall units; The fixing piece is suitable for fixing and connecting the fixing plate and the wall unit.

[0010] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, the fixing member comprises: A fixing rod, which is pre-buried in the wall unit and has an end extending out of the wall surface of the wall unit to form a fixing end. The fixing plate is provided with a fixing hole, the fixing end is passed through the fixing hole, and a thread is provided on the fixing end; A fixing nut is threadedly connected to the fixing end and abuts against the other side of the fixing plate relative to the wall unit.

[0011] According to a prefabricated wall structure for retaining a tunnel along an airspace provided by the present invention, the wall unit provided with the connecting position is a first wall unit, a plurality of the first wall units are arranged side by side and spliced ​​by the locking structure; the flexible mold bag is connected to the connecting position of the first wall unit by a connecting component.

[0012] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, the connection position comprises crimping surfaces arranged on two opposite sides of the top of the first wall unit, and two sides of the bottom of the flexible mold bag are in contact with the crimping surfaces; the connection assembly comprises: A crimping piece, used for crimping the flexible mold bag onto the crimping surface; A connecting piece is used to connect and lock the crimping piece and the crimping surface.

[0013] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, the connecting member comprises: An anchor rod, adapted to sequentially pass through the crimping pieces, the crimping surface and both sides of the bottom of the flexible mold bag located on opposite sides of the first wall unit, the end of the anchor rod being a threaded end; A tray, sleeved on the anchor rod, and used for abutting and cooperating with the other side of the crimping piece relative to the crimping surface; A connecting nut is threadedly connected to the threaded end and is used for abutting and matching with the other end of the tray relative to the crimping piece.

[0014] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, the wall comprises a top layer and at least one bottom layer located below the top layer; The wall unit also includes a second wall unit; a plurality of the first wall units are spliced ​​together to form the top layer, and a plurality of the second wall units are spliced ​​together to form at least one layer of the bottom layer; the wall units located on the upper and lower layers are staggered.

[0015] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, the connection position also includes a shoulder provided on the first wall unit and arranged at an angle to the crimping surface, the shoulder is adapted to the crimping piece, and the crimping piece is supported on the shoulder.

[0016] A prefabricated wall structure along the gob-retaining tunnel provided by the present invention also includes metal inner reinforcement arranged in the sealing channel, a part of the metal inner reinforcement is located in the sealing groove of the upper wall unit, and the other part is located in the sealing groove of the lower wall unit.

[0017] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, the metal inner reinforcement is made of channel steel or I-beam.

[0018] According to a prefabricated wall structure for retaining a tunnel along a gob provided by the present invention, the wall unit is provided with a mounting hole for cooperating with a forklift.

[0019] The present invention also provides a construction method for a prefabricated wall structure along a gob-side tunnel retaining, comprising the following steps: Prefabricate the wall unit, assemble the flexible mold bag and the corresponding wall unit into a whole; The wall units are transported to the underground construction location, and the wall units are placed in sequence, and the locking structures of adjacent wall units are engaged to form a wall; Pump cement slurry into the top-jointed flexible film bag through the grouting port, and fill the sealed channel between adjacent wall units with cement slurry until the flexible film bag is completely joined to the top and generates a certain pressure, and finally wait for the cement slurry to solidify to form a complete and closed lane retaining wall structure; After constructing a certain distance, move the hydraulic unit support, rock retaining support, transition support and end support forward and repeat the construction process of the wall unit.

[0020] The prefabricated wall structure and construction method for retaining tunnels along the goaf provided by the present invention enable the wall surfaces of adjacent wall units to remain aligned under the constraints of the engaged male tenons and female grooves, without the need for subsequent manual adjustment, thus reducing the construction difficulty and workload; the locking structure can also limit the adjacent wall units to resist the lateral and longitudinal forces caused by the collapse of the goaf, thereby avoiding lateral and longitudinal displacement of the upper adjacent wall units; after the wall units are spliced, the pre-installed flexible mold bags are arranged side by side on the top of the wall along the length direction of the wall, without the need for underground climbing operations, thus reducing the workload and eliminating the potential safety hazards caused by underground climbing operations. The above-mentioned technical scheme can make the construction simpler, faster and safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a prefabricated wall structure for retaining a tunnel along the goaf provided by an embodiment of the present invention.

[0023] Figure 2 It is a schematic structural diagram of the splicing of adjacent wall units provided by an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the cooperation between the through hole and the sealing groove provided in an embodiment of the present invention.

[0025] Figure 4 It is a schematic structural diagram of the cooperation between the first wall unit and the flexible mold bag provided by an embodiment of the present invention.

[0026] Figure 5 It is a structural schematic diagram of a prefabricated wall structure along an air-retained tunnel provided by another embodiment of the present invention.

[0027] Figure 6 It is a structural schematic diagram of a prefabricated wall structure along an air-retained tunnel provided by another embodiment of the present invention.

[0028] Figure 7 It is a structural schematic diagram of a prefabricated wall structure along an air-retained tunnel provided by another embodiment of the present invention.

[0029] Figure 8 It is a schematic diagram of the coordination between the prefabricated wall structure and the tunnel along the goaf provided by an embodiment of the present invention.

[0030] Fig. 9It is a flow chart of a construction method of a prefabricated wall structure for retaining a tunnel along the goaf provided in an embodiment of the present invention.

[0031] Reference numerals: 1. Wall unit; 10. First wall unit; 11. Second wall unit; 100. Sealing groove; 101. Through hole; 102. Metal inner rib; 103. Mounting hole; 104. Crimp surface; 105. Shoulder; 2. Flexible mold bag; 20. Grouting port; 3. Locking structure; 30. Female groove; 31. Male tenon; 4. Fixing assembly; 40. Fixing plate; 41. Fixing piece; 410. Fixing rod; 411. Fixing nut; 5. Connecting assembly; 50. Crimp piece; 51. Connecting piece; 510. Anchor rod; 511. Tray; 512. Connecting nut; 60. Goaf of this working face; 61. Hydraulic unit bracket; 62. Top material pump; 63. Pumping pipe; 64. Gangue retaining bracket; 65. Transition bracket; 66. End bracket; 67. Area to be mined. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to facilitate understanding of the prefabricated wall structure and construction method of the goaf-side tunnel provided by the present invention, its application background is first introduced. Goaf-side tunnel is a main way to improve coal recovery rate and green mining without coal pillars, which can effectively reduce coal losses. It can be used for recovery in the working face of the lower section, and has many advantages such as reducing tunnel excavation rate, realizing Y-type ventilation, and solving gas accumulation in corners.

[0034] There are two main ways to form the existing goaf-side tunnel wall: one is to cast a concrete wall on site on one side of the goaf; the other is to prefabricate the concrete wall and then place it on one side of the goaf for support. Both methods replace the traditional coal pillar retention, retain the transportation tunnel of the working face, and provide for the recovery of the working face in the next section.

[0035] However, among the above-mentioned related technologies, on-site pouring is restricted by underground conditions (dark tunnels and dim light), and not only requires concrete transport vehicles and long-distance concrete pumping, but also complex tasks such as assembling molds on the construction site, hanging flexible molds, lubricating and washing pumps, etc., requiring a large number of people, high pouring costs, and slow construction. Not only is the speed of retaining lanes unable to keep up with the rapid advancement of the working face, but the on-site poured concrete also takes a long time to solidify, and its low early strength makes it difficult to meet the requirements of bearing the top plate pressure.

[0036] The construction of prefabricated walls along the goaf is difficult. After the concrete blocks are placed, they need to be manually aligned to the wall by pulling anchor rods. The wall alignment is difficult (the weight of a single concrete block is basically in the tons level). At the same time, it is necessary to climb underground to install the top flexible formwork. The underground environment is complex, and climbing operations will undoubtedly bring huge workload and safety hazards.

[0037] In view of the above problems, the present invention provides a prefabricated wall structure and a construction method for retaining a tunnel along the goaf, which has the advantages of being easier, faster and safer to construct.

[0038] Combine the following Figure 1-Figure 9 The invention describes the prefabricated wall structure and construction method of the gob-side tunnel retaining device.

[0039] Reference Figures 1 to 3 A prefabricated wall structure along an air-gap tunnel comprises a wall unit 1 and a flexible mold bag 2; wherein, a splicing surface is provided on the side of the wall unit 1, and a locking structure 3 is provided on the splicing surface, and a plurality of wall units 1 are spliced ​​together to form a wall through the locking structure 3; the locking structure 3 comprises a male tenon 31 and a female groove 30 respectively arranged on the splicing surfaces of adjacent wall units 1, and the male tenons 31 and the female grooves 30 of adjacent wall units 1 are engaged, thereby limiting the relative movement of adjacent wall units 1 along the wall surface direction.

[0040] At least part of the wall unit 1 is provided with a connection position, and the flexible mold bag 2 can be connected to the connection position to be assembled into a whole with the wall unit 1. Multiple flexible mold bags 2 are arranged side by side on the top of the wall along the length direction of the wall, and a grouting port 20 is provided on the flexible mold bag 2.

[0041] In actual construction of a prefabricated wall structure for retaining a tunnel along the goaf, the wall unit 1 is prefabricated first, and the flexible mold bag 2 can be connected to the connecting position of the wall unit 1 before the wall unit 1 is transported underground, so that the flexible mold bag 2 and the wall unit 1 are assembled into a whole, and then the wall unit 1 is transported underground and placed in sequence, the male tenons 31 and female grooves 30 of adjacent wall units 1 are engaged, and multiple wall units 1 are spliced ​​together to form a wall; after the wall units 1 are spliced, the pre-installed flexible mold bags 2 are arranged side by side on the top of the wall along the length direction of the wall, and after the wall is spliced, grouting is injected into the flexible mold bag 2 through the grouting holes until the flexible mold bag 2 is completely connected to the top and generates a certain pressure, and finally the cement slurry is solidified to form a complete and closed tunnel retaining wall structure.

[0042] Compared with the related art, the wall surfaces of adjacent wall units 1 are kept flush under the constraints of the engaged male tenons 31 and female grooves 30, without the need for subsequent manual adjustments, reducing the construction difficulty and workload, and the locking structure 3 can also limit the adjacent wall units 1 to resist the lateral and longitudinal forces caused by the collapse of the goaf, and avoid lateral and longitudinal displacement of the adjacent wall units 1; after the wall units 1 are spliced, the pre-installed flexible mold bags 2 are arranged side by side at the top of the wall along the length direction of the wall, without the need for underground climbing operations, reducing the workload and eliminating the safety hazards brought about by underground climbing operations. Through the above-mentioned technical solution, the construction can be simpler, faster and safer.

[0043] In some optional embodiments, the wall unit 1 can be set to different structures, shapes and specifications to adapt to different needs and working conditions. For example, when the tunnel height is low, the wall structure can be composed of a layer of wall units 1 arranged side by side, and when the tunnel height is high, the wall structure can be composed of two or more layers of wall units 1 arranged side by side. The wall unit 1 can be set to a rectangle or other shapes, as long as the sides of adjacent wall units 1 can be spliced ​​to form a flat and closed wall. Of course, in order to improve the supporting strength of the wall unit 1, the wall unit 1 can also be set to a partially thickened special-shaped structure, for example, by thickening the bottom of the wall unit 1 to improve the bottom support capacity of the wall unit 1. The wall unit 1 can be formed by pouring concrete, and the anti-splitting ability and bearing capacity of the wall unit 1 can also be improved by an internal steel skeleton. The above can be flexibly combined and configured according to actual needs and working conditions.

[0044] In one embodiment of the present invention, the wall unit 1 is rectangular as a whole and is cast with reinforced concrete material. Each wall unit 1 has four sides, and the surface of the four sides of each wall unit 1 used for splicing with adjacent wall units 1 is set as a splicing surface. According to the number of layers of the wall and the position of the wall unit 1, the position of the splicing surface of each wall unit 1 will also be different. For example, the splicing surface may be formed on the left and right sides of the wall unit 1, or it may be formed as the left, right and lower sides of the wall unit 1, or it may be formed as the left, right, upper and lower sides of the wall unit 1. It can be specifically configured according to actual working conditions. It only needs to place multiple wall units 1 in sequence, and the male tenons 31 and female grooves 30 of adjacent wall units 1 can be fitted together, so that multiple wall units 1 can be spliced ​​to form a whole wall.

[0045] The cross-sectional shape of the male tenon 31 and the female groove 30 can be rectangular, wedge-shaped, or any shape that can be laterally engaged, as long as the engaged male tenon 31 and the female groove 30 can limit the relative movement of the adjacent wall units 1 along the wall surface. In addition, the formation method of the male tenon 31 and the female groove 30 on the wall unit 1 can also be selected, for example, the male tenon 31 and the female groove 30 can be integrally cast with the wall unit 1, or can be formed on the joint surface of the wall unit 1 through post-processing, and can be specifically configured according to actual needs and working conditions.

[0046] In this embodiment, the cross-sectional shape of the male tenon 31 and the female groove 30 is set to be wedge-shaped, so that the matching surface of the male tenon 31 and the female groove 30 is an inclined surface, and the female groove 30 is formed into a flared shape in the direction away from the wall unit 1, while the male tenon 31 is gradually reduced in cross-sectional shape in the direction away from the wall unit 1, so that during the splicing process of the wall unit 1, the male tenon 31 and the female groove 30 can be more conveniently aligned and self-guided, which is conducive to improving the convenience of splicing the wall unit 1. In addition, the male tenon 31 and the female groove 30 with inclined surfaces can extend the penetration path, which can reduce the risk of water leakage and air leakage in the wall structure.

[0047] In order to ensure a stable connection between adjacent wall units 1, refer to Figure 1 and Figure 2 , adjacent wall units 1 are fixedly connected via fixing components 4 .

[0048] Specifically, the fixing assembly 4 includes a fixing plate 40 and a fixing member 41, wherein the fixing plate 40 is simultaneously attached to the wall surfaces of two adjacent wall units 1, and the fixing member 41 is suitable for fixing and connecting the fixing plate 40 and the wall unit 1. The connection between the two adjacent wall units 1 is achieved through the fixing plate 40 and the fixing member 41.

[0049] According to different needs, the fixing part 41 can adopt different structures or forms, for example, a self-tapping part can be adopted. However, when the fixing part 41 in the above form is adopted, it is necessary to manually push the adjacent wall units 1 laterally during the process of connecting the fixing part 41 to ensure the sealing of the lateral joints of the adjacent wall units 1, which makes the construction more difficult.

[0050] Therefore, in one embodiment of the present invention, the fixing member 41 includes a fixing rod 410 and a fixing nut 411; wherein, the fixing rod 410 is pre-buried in the wall unit 1 and the end thereof extends out of the wall surface of the wall unit 1 to form a fixed end, and a fixing hole is provided on the fixing plate 40 for the fixing end to pass through, and a thread is provided on the fixing end; the fixing nut 411 is used to be threadedly connected to the fixing end and abut against a side of the fixing plate 40 facing away from the wall unit 1.

[0051] In actual application, after the wall units 1 are spliced, the staff uses forklifts, shovels and other equipment to push the two adjacent wall units 1 laterally, so that the fixing rods 410 on the two adjacent wall units 1 correspond to the fixing holes on the fixing plate 40, and the fixed ends of the fixing rods 410 pass through the fixing holes on the fixing plate 40 to achieve lateral positioning of the two adjacent wall units 1. Then, the fixing nuts 411 are connected to the fixed ends and pressed against the fixing plates 40 to achieve connection and fixation of the two adjacent wall units 1. Through the above-mentioned type of fixing parts 41, the connection of adjacent walls is simpler and more convenient.

[0052] It is found in actual applications that even if the processing technology is sophisticated and the male tenon 31 and the female groove 30 fit tightly, the joint gap between two adjacent wall units 1 is still unavoidable, and the wall structure still has the risk of water leakage and air leakage.

[0053] In order to solve the above problems, a sealing groove 100 is provided on the joint surface of the wall unit 1, and the sealing groove 100 extends along the length direction of the side of the wall unit 1. The sealing grooves 100 of adjacent wall units 1 are positioned correspondingly to form a sealing channel, and the flexible mold bag 2 is connected to the sealing channel.

[0054] After the wall unit 1 is spliced, grout is injected into the flexible mold bag 2 through the grouting hole, and the slurry flows into the sealed channel through the flexible mold bag 2, thereby achieving the sealing of the splicing gap between two adjacent wall units 1. After the sealed channel is completely filled, the flexible mold bag 2 is completely connected to the top and generates a certain pressure. After the slurry solidifies, a complete and closed wall structure is formed. By providing a sealing groove 100 on the wall unit 1, the risk of water leakage and air leakage of the wall structure can be reduced, and the connection strength between two adjacent wall units 1 can be enhanced, thereby improving the resistance of the wall structure to lateral instability.

[0055] The sealing groove 100 on the joint surface of each wall unit 1 can be provided with one or more than two at intervals, and can be adaptively configured according to the sealing requirements or strength requirements of the wall structure.

[0056] In one embodiment of the present invention, the sealing groove 100 extends from the joint surface to the bottom surface of the wall unit 1 for contacting the ground. With such a configuration, the slurry injected into the flexible mold bag 2 can flow along the sealing groove 100 to the ground of the tunnel. When used in a mine with an uneven tunnel ground, the sealing of the tunnel wall ground can be ensured without leveling the tunnel ground in advance, which reduces the workload of manual labor and makes the construction faster and more convenient.

[0057] In one embodiment of the present invention, a through hole 101 is provided on the wall unit 1, and the sealing groove 100 at the top of the wall unit 1 and the sealing groove 100 at the bottom of the wall unit 1 are connected through the through hole 101. In this way, the resistance of the slurry flow can be effectively reduced, so that the slurry can flow more smoothly to the ground of the tunnel.

[0058] In one embodiment of the present invention, the wall structure further includes metal inner reinforcement 102; when the wall has two layers, a portion of the metal inner reinforcement 102 is located in the sealing groove 100 of the upper wall unit 1, and the other portion is located in the sealing groove 100 of the lower wall unit 1. The metal inner reinforcement 102 can further enhance the connection strength of the upper and lower wall units 1, thereby further improving the lateral instability resistance of the wall structure.

[0059] Specifically, the metal inner rib 102 can be made of channel steel or I-beam. In this way, the metal inner rib 102 plays a reinforcing role while not blocking the sealing channel.

[0060] In one embodiment of the present invention, in order to facilitate the underground transportation of the wall unit 1, a mounting hole 103 for cooperating with a forklift is provided on the wall unit 1.

[0061] The connection method between the flexible mold bag 2 and the wall unit 1 will be described in detail below with reference to the accompanying drawings.

[0062] The connection position on the wall unit 1 can provide a connection position for the flexible mold bag 2, so that the flexible mold bag 2 can be connected to the wall unit 1 as a whole before the wall unit 1 is transported underground. For the convenience of description and understanding, the wall unit 1 provided with the above connection position is defined as the first wall unit 10, and the wall unit 1 not provided with the above connection position is defined as the second wall unit 11. The flexible mold bag 2 is detachably connected to the connection position on the first wall unit 10 through the connection component 5.

[0063] In one embodiment of the present invention, referring to Figure 4 The connection position includes crimping surfaces 104 arranged on opposite sides of the top of the first wall unit 10, and the two sides of the bottom of the flexible mold bag 2 are in contact with the crimping surfaces 104; the connecting component 5 includes a crimping piece 50 and a connecting piece 51; wherein the crimping piece 50 is used to crimp the flexible mold bag 2 onto the crimping surface 104; the connecting piece 51 is used to connect and lock the crimping piece 50 and the crimping surface 104, thereby connecting the flexible mold bag 2 to the first wall unit 10.

[0064] According to different needs, the connecting piece 51 can adopt different structures or forms, for example, a self-tapping piece can be adopted. However, in order to ensure the stability of the connection between the flexible mold bag 2 and the first wall unit 10 and the sealing performance of the connection between the flexible mold bag 2, in this embodiment, the connecting piece 51 includes a tension anchor rod 510, a tray 511 and a connecting nut 512; wherein, the tension anchor rod 510 is suitable for sequentially passing through the crimping piece 50, the crimping surface 104 and the two sides of the bottom of the flexible mold bag 2 located on the opposite sides of the first wall unit 10, and the two ends of the tension anchor rod 510 are set as threaded ends; the tray 511 is sleeved on the tension anchor rod 510, and is used to abut and cooperate with the other side of the crimping piece 50 relative to the crimping surface 104; the connecting nut 512 is threadedly connected to the threaded end of the tension anchor rod 510, and is used to abut and cooperate with the other end of the tray 511 relative to the crimping piece 50.

[0065] In actual applications, the flexible mold bag 2 is placed on the top of the first wall unit 10. Since the flexible mold bag 2 is flexible, the two sides of the bottom of the flexible mold bag 2 fit with the crimping surfaces 104 on both sides of the top of the first wall unit 10. The anchor rod 510 is used to pass through the crimping parts 50, the crimping surfaces 104 and the two sides of the bottom of the flexible mold bag 2 on the opposite sides of the first wall unit 10 in sequence. The tray 511 is installed and the connecting nut 512 is threadedly connected to the anchor rod 510. The connecting nut 512 and the tray 511 are abutted and matched with the other end of the crimping part 50, so that the crimping part 50 presses the flexible mold bag 2 and the crimping surface 104, thereby realizing the connection of the flexible mold bag 2 on the first wall unit 10.

[0066] In one embodiment of the present invention, the connection position further includes a shoulder 105 disposed on the first wall unit 10 and arranged at an angle to the crimping surface 104, the shoulder 105 is adapted to the crimping piece 50, and the bottom of the crimping piece 50 is supported on the shoulder 105. The shoulder 105 can support and limit the crimping piece 50.

[0067] Specifically, the crimping member 50 is configured as a slatted wood, and the shoulder 105 and the crimping surface 104 are arranged at an angle of 90 degrees, so that a right angle is formed between the shoulder 105 and the crimping surface 104, and the right angle can provide bottom support and limitation for the slatted wood.

[0068] In one embodiment of the present invention, referring to Figure 5 When the tunnel height is low, the wall can be composed of a layer of wall units 1 arranged side by side. At this time, the wall units 1 constituting the wall can all be first wall units 10.

[0069] In another embodiment of the present invention, when the tunnel height is relatively high, the wall includes a top layer and at least one bottom layer located below the top layer; a plurality of first wall units 10 are spliced ​​to form a top layer, and a plurality of second wall units 11 are spliced ​​to form at least one bottom layer; the wall units 1 located on the upper and lower layers are staggered.

[0070] In a specific application scenario, refer to Figure 1 The wall is provided with two layers, upper and lower layers.

[0071] In another specific application scenario, refer to Figure 6 The wall is arranged with three layers arranged up and down.

[0072] It is understandable that, depending on the height requirements of the laneway, the wall can also be provided with more than three layers arranged vertically.

[0073] In another specific application scenario, refer to Figure 7 The wall is provided with a layer and the bottom of the wall unit 1 constituting the wall is thickened to form a special-shaped structure.

[0074] It is to be understood that, without mutual contradiction, those skilled in the art may combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification.

[0075] The construction method of the prefabricated wall structure for retaining a tunnel along the goaf provided by the present invention is described below. The construction method of the prefabricated wall structure for retaining a tunnel along the goaf described below and the prefabricated wall structure for retaining a tunnel along the goaf described above can be referred to each other.

[0076] Reference Figure 8 and Fig. 9 ,in, Figure 8 A schematic diagram showing the coordination between the prefabricated wall structure and the tunnel along the gob retaining lane is shown; Fig. 9 A schematic flow chart of a construction method for a prefabricated wall structure for retaining a tunnel along the goaf is shown.

[0077] A construction method for a prefabricated wall structure for retaining a tunnel along a goaf, comprising the following steps: Step S1, prefabricate the wall unit 1, and assemble the flexible mold bag 2 and the corresponding wall unit 1 into a whole.

[0078] Step S2, transporting the wall units 1 to the underground construction site, placing the wall units 1 in sequence, and engaging the locking structures 3 of adjacent wall units 1 to form a wall.

[0079] Step S3, pumping cement slurry into the flexible mold bag through the grouting port 20, the cement slurry fills the sealed channel between adjacent wall units 1 until the flexible mold bag 2 is completely topped and generates a certain pressure, and finally the cement slurry solidifies to form a complete and closed lane retaining wall structure.

[0080] Step S4, after constructing a certain distance, move the hydraulic unit support 61, the rock blocking support 64, the transition support 65 and the end support 66 forward, and repeat the construction process of the wall unit 1.

[0081] Step S1 also includes: Step S10, fit the two sides of the bottom of the flexible mold bag 2 with the crimping surfaces 104 on both sides of the top of the wall unit 1, use the anchor rod 510 to pass through the crimping parts 50 on the opposite sides of the unit, the crimping surfaces 104 and the two sides of the bottom of the flexible mold bag 2 in sequence, install the tray 511 and lock it through the connecting nut 512.

[0082] Step S2 also includes: Step S20, before the locking structures 3 of adjacent wall units 1 are engaged, the metal inner ribs 102 are placed in the lateral sealing grooves 100 of the wall units 1, with a portion of the metal inner ribs 102 located in the sealing grooves 100 of the upper wall unit 1 and another portion of the metal inner ribs 102 located in the sealing grooves 100 of the lower wall unit 1.

[0083] Step S21, after the locking structures 3 of adjacent wall units 1 are engaged, the fixing rods 410 on the two adjacent wall units 1 are aligned with the fixing holes on the fixing plate 40, and the fixing ends of the fixing rods 410 are passed through the fixing holes on the fixing plate 40 and then locked by the fixing nuts 411.

[0084] Through the prefabricated wall structure and construction method for retaining tunnels along the goaf provided by the present invention, the wall surfaces of adjacent wall units 1 are kept aligned under the constraints of the embedded male tenons 31 and female grooves 30, and no subsequent manual adjustment is required, thereby reducing the construction difficulty and workload. The locking structure 3 can also limit the adjacent wall units 1 to resist the lateral and longitudinal forces caused by the collapse of the goaf, and avoid lateral and longitudinal displacement of the upper adjacent wall units 1. After the wall units 1 are spliced, the pre-installed flexible mold bags 2 are arranged side by side on the top of the wall along the length direction of the wall, without the need for underground climbing operations, reducing the workload and eliminating the safety hazards caused by underground climbing operations. Through the above-mentioned technical scheme, the construction can be simpler, faster and safer.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A prefabricated wall structure for retaining a tunnel along the goaf, characterized in that: include: A wall unit (1), wherein a joint surface is provided on the side of the wall unit (1), a locking structure (3) is provided on the joint surface, and a plurality of the wall units (1) are joined together by the locking structure (3) to form a wall; the locking structure (3) comprises a male tenon (31) and a female groove (30) respectively provided on the joint surfaces of adjacent wall units (1), and the male tenons (31) and the female grooves (30) of adjacent wall units (1) are engaged with each other; A flexible mold bag (2), at least part of the wall unit (1) is provided with a connection position, the flexible mold bag (2) can be connected to the connection position so as to be assembled with the wall unit (1) as a whole, and a plurality of the flexible mold bags (2) are arranged side by side on the top of the wall along the length direction of the wall; a grouting port (20) is provided on the flexible mold bag (2).

2. The prefabricated wall structure for retaining a tunnel along the goaf according to claim 1 is characterized in that: A sealing groove (100) is provided on the joint surface of the wall unit (1), and the sealing grooves (100) of adjacent wall units (1) are aligned with each other to form a sealing channel, and the flexible mold bag (2) is connected to the sealing channel.

3. The prefabricated wall structure for retaining a tunnel along the goaf according to claim 2 is characterized in that: The sealing groove (100) extends from the joint surface to the bottom surface of the wall unit (1) for contacting the ground; The wall unit (1) is provided with a through hole (101), and the sealing groove (100) at the top of the wall unit (1) and the sealing groove (100) at the bottom are connected through the through hole (101).

4. The prefabricated wall structure for retaining a tunnel along the goaf according to claim 1 is characterized in that: Adjacent wall units (1) are fixedly connected via a fixing assembly (4); the fixing assembly (4) comprises: A fixing plate (40) is simultaneously attached to two adjacent wall units (1); A fixing member (41) is suitable for fixing and connecting the fixing plate (40) and the wall unit (1).

5. The prefabricated wall structure for retaining a tunnel along the goaf according to claim 4 is characterized in that: The fixing member (41) comprises: A fixing rod (410) is pre-buried in the wall unit (1) and has an end extending out of the wall surface of the wall unit (1) to form a fixing end, the fixing end is provided with a thread, the fixing plate (40) is provided with a fixing hole, and the fixing end is inserted into the fixing hole; A fixing nut (411) is threadedly connected to the fixing end and abuts against the other side of the fixing plate (40) relative to the wall unit (1).

6. The prefabricated wall structure along the gob retaining tunnel according to any one of claims 1 to 5, characterized in that: The wall unit (1) provided with the connection position is a first wall unit (10); a plurality of the first wall units (10) are arranged side by side and spliced ​​together via the locking structure (3); the flexible mold bag (2) is connected to the connection position of the first wall unit (10) via a connection component (5).

7. The prefabricated wall structure for retaining a tunnel along the gob according to claim 6 is characterized in that: The connection position comprises crimping surfaces (104) arranged on two opposite sides of the top of the first wall unit (10), and two sides of the bottom of the flexible mold bag (2) are in contact with the crimping surfaces (104); the connection component (5) comprises: A crimping member (50) for crimping the flexible mold bag (2) onto the crimping surface (104); A connecting piece (51) is used to connect and lock the crimping piece (50) and the crimping surface (104).

8. The prefabricated wall structure for retaining a tunnel along the goaf according to claim 7 is characterized in that: The connecting member (51) comprises: An anchor rod (510) is adapted to sequentially pass through the crimping pieces (50) located on opposite sides of the first wall unit (10), the crimping surface (104) and the two sides of the bottom of the flexible mold bag (2), and the end of the anchor rod (510) is configured as a threaded end; A tray (511) is sleeved on the anchor rod (510) and is used to abut and cooperate with the other side of the crimping member (50) relative to the crimping surface (104); A connecting nut (512) is threadedly connected to the threaded end and is used to abut and cooperate with the other end of the tray (511) relative to the crimping member (50).

9. The prefabricated wall structure for retaining a tunnel along the gob according to claim 6, characterized in that: The wall comprises a top layer and at least one bottom layer located below the top layer; The wall unit (1) further comprises a second wall unit (11); a plurality of the first wall units (10) are spliced ​​together to form the top layer, and a plurality of the second wall units (11) are spliced ​​together to form at least one layer of the bottom layer; the wall units (1) located on the upper and lower layers are arranged in a staggered manner.

10. A construction method for a prefabricated wall structure along a goaf retaining tunnel, characterized in that: The following steps are involved: Prefabricating a wall unit (1), assembling a flexible mold bag (2) and a corresponding wall unit (1) into a whole; The wall units (1) are transported to an underground construction location, the wall units (1) are placed in sequence, and the locking structures (3) of adjacent wall units (1) are engaged to form a wall; Pumping cement slurry into the top-jointed flexible film bag through the grouting port (20), the cement slurry fills the sealed channel between the adjacent wall units (1), until the flexible mold bag (2) is completely joined to the top and generates a certain pressure, and finally the cement slurry solidifies to form a complete and closed lane retaining wall structure; After a certain distance has been constructed, the hydraulic unit support (61), the rock blocking support (64), the transition support (65) and the end support (66) are moved forward, and the construction process of the wall unit (1) is repeated.

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