Rapid support wall mold, wall and construction method for gob-side tunnel retaining

Abstract

The present invention relates to the technical field of underground coal mine construction, and provides a wall mold for rapid support of a tunnel along the goaf, a wall, and a construction method. The wall mold includes: a mold body, which is provided with a forming cavity inside; a protrusion, which is located on the mold body, and the protrusion protrudes from the inner surface of the mold body toward the outside of the forming cavity, dividing the forming cavity into a first cavity with a larger cross-sectional area, and a second cavity with a smaller cross-sectional area located on the side of the first cavity; a grouting port, which is provided on the mold body. By using multiple molds to cast the wall and splicing the walls together, a stable support can be formed for the tunnel, and a good sealing effect can also be achieved; the mold body can form a constraint on the outside of the wall to increase the stability of the entire wall and reduce the problem of cracks in the wall; the second cavity has a smaller cross-sectional area, which reduces the filling volume and the filling cost while ensuring stable support; the mold bodies are easy to splice, which speeds up the tunnel retention speed.

Description

Technical Field

[0001] The present invention relates to the technical field of underground coal mine construction, and in particular to a fast supporting wall mold for a goaf-side lane retaining, a wall and a construction method. Background Art

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

[0003] Existing gob-side entry retention technologies fall into two main categories: one involves pouring a concrete wall on one side of the gob, and the other involves pouring concrete pillars on the other side of the gob. Both replace traditional coal pillar retention, preserving the haulage roadway at the working face and allowing it to be used for mining in the next section.

[0004] However, the existing gob-side tunnel retaining walls have a large filling volume, high filling costs, and slow tunnel retaining speed, making it difficult to meet the requirements of the existing high-yield and high-efficiency working face advancement speed; the piers of the gob-side tunnel retaining piers are difficult to meet the sealing requirements; in addition, both usually require frequent leak repairs in the later stages, and the maintenance workload is high. Summary of the Invention

[0005] The present invention provides a rapid support wall mold, wall and construction method for goaf-side tunnel retaining, which are used to reduce the problems in the prior art of large filling volume of goaf-side tunnel retaining walls, high filling cost, slow tunnel retaining speed, and difficulty in meeting sealing requirements for goaf-side tunnel retaining piers. The invention has the advantages of less filling volume, lower filling cost, faster tunnel retaining speed, better sealing between walls, and less or even no maintenance in the later stage.

[0006] The present invention provides a rapid support wall mold for a gob-side tunnel retaining system, comprising:

[0007] A mold body, wherein a molding cavity is provided in the mold body;

[0008] a protrusion, the protrusion being located on the mold and protruding from the inner surface of the mold body toward the outside of the molding cavity, dividing the molding cavity into a first cavity having a larger cross-sectional area and a second cavity located on a side of the first cavity and having a smaller cross-sectional area;

[0009] A grouting port is provided on the mold body and communicated with the forming cavity.

[0010] According to the present invention, a quick-support wall mold for leaving a tunnel along the goaf also includes a skeleton arranged in the forming cavity; the skeleton is woven from reinforcement materials, and the ends of the reinforcement materials pass through and expose the side surfaces of the mold body to form connecting ends.

[0011] According to a mold for quickly supporting a wall along an air-gap tunnel provided by the present invention, one side surface of the mold body is provided with a tenon, and the other side surface is provided with a groove adapted to the tenon.

[0012] According to a rapid support wall mold for retaining a tunnel along the goaf provided by the present invention, a sealing cavity for pouring a sealing material is provided on the mold body outside the forming cavity.

[0013] According to the present invention, a rapid supporting wall mold for a tunnel along the goaf also includes a flexible mold bag sealed to the top of the mold body.

[0014] According to the present invention, a mold for quickly supporting a wall by retaining a tunnel along a gob, the mold body comprises a pair of baffles arranged opposite to each other, and a pair of side plates arranged opposite to each other, and the forming cavity is enclosed by the baffles and the side plates;

[0015] The protrusion is disposed on at least one of the two baffles.

[0016] According to a rapid support wall mold for retaining a tunnel along the goaf provided by the present invention, at least one of the two baffles is a hollow sandwich structure, thereby forming the sealed cavity outside the forming cavity.

[0017] According to a gob-side tunnel retaining rapid support wall mold provided by the present invention, the two baffles are connected into a whole by a plurality of connecting pieces; the connecting pieces include:

[0018] A connecting rod passing through the two baffles in sequence;

[0019] A pair of limiting parts are arranged on the connecting rod at intervals and respectively abut against the two baffles to limit the two baffles between the two limiting parts.

[0020] According to the gob-side tunnel retaining rapid support wall mold provided by the present invention, at least one of the limiting portions is threadedly connected to the connecting rod.

[0021] According to a gob-side tunnel retaining rapid support wall mold provided by the present invention, the flexible mold bag is sealed and connected to the two baffles by riveting.

[0022] According to a quick support wall mold for leaving a tunnel along the goaf provided by the present invention, a connecting portion with a bottom opening is provided at the bottom of the flexible mold bag. When the flexible mold bag is connected to the mold body, the connecting portion is located in the molding cavity.

[0023] According to a rapid support wall mold for retaining a tunnel along the goaf provided by the present invention, the connecting rods of some of the connecting members are passed through the connecting portion, and the flexible mold bag is fixedly connected to the mold body.

[0024] According to a rapid support wall mold for a gob-side tunnel provided by the present invention, both sides of one of the side panels are fixedly connected to the side surfaces of the two baffles via pins.

[0025] According to a quick support wall mold for a gob-side tunnel provided by the present invention, a slot is provided between the two baffles, and the other side plate is inserted into the slot.

[0026] The present invention also provides a fast supporting wall for retaining a tunnel along a gob, comprising:

[0027] A mold body, wherein a molding cavity is provided in the mold body;

[0028] a protrusion, the protrusion being located on the mold and protruding from the inner surface of the mold body toward the outside of the molding cavity, dividing the molding cavity into a first cavity having a larger cross-sectional area and a second cavity located on a side of the first cavity and having a smaller cross-sectional area;

[0029] a support body, formed in the molding cavity;

[0030] The support body includes a support portion formed in the first cavity and a sealing portion formed in the second cavity.

[0031] According to a rapid support wall for retaining a tunnel along a gob provided by the present invention, a frame is provided in the support body; the frame is woven from reinforcement materials, and the ends of the reinforcement materials are exposed from the side surfaces of the support body.

[0032] According to a rapid support wall for a gob-side tunnel retaining provided by the present invention, a sealing layer is provided outside the support body.

[0033] According to a fast supporting wall for retaining a tunnel along the goaf provided by the present invention, a convex tenon portion is provided on one side of the supporting body, and a groove portion adapted to the convex tenon portion is provided on the other side.

[0034] According to a rapid support wall for retaining a tunnel along a gob provided by the present invention, a flexible mold bag is provided on the top of the support body.

[0035] According to a gob-side tunnel retaining rapid support wall provided by the present invention, two opposite sides of the mold body are connected by a connecting piece; the connecting piece includes:

[0036] A connecting rod, passing through the mold body and the support body in sequence;

[0037] A pair of limiting parts are respectively in contact with two opposite surfaces of the mold body.

[0038] The present invention also provides a construction method for a fast supporting wall of a gob-side tunnel retaining device, comprising the following steps:

[0039] S1: Arrange the hydraulic unit support and the rock retaining support;

[0040] S2: Level the construction site;

[0041] S3: assemble the mold;

[0042] S4: Pump concrete into the mold body until the flexible mold bag is completely topped and generates a certain pressure;

[0043] S5: Pumping sealing material into the sealing cavity;

[0044] S6: Move the hydraulic unit support and the rock retaining support forward, and connect the concrete pumping pipe and the sealing material pumping pipe;

[0045] Repeat steps S2-S6. Beneficial effects

[0046] 1. The present invention provides a mold, wall and construction method for quickly supporting a wall along an air-gapped tunnel. Concrete can be injected into the forming cavity through a grouting port. The concrete is formed into a wall in the forming cavity. The part formed in the first cavity has a larger cross-sectional area and is the main part, which mainly plays a supporting role. The part formed in the second cavity is thinner and can form a sealing area between different walls or the main part of the same wall, which plays a sealing role and also has a certain supporting role. By using multiple templates to cast the wall and splicing the walls together, a stable support can be formed for the tunnel, and the sealing area can have a good sealing effect. At the same time, the mold body can form a constraint on the outside of the wall to increase the stability of the entire wall, reducing the problem of cracks in the tunnel wall due to the advancement of the working surface and the increase in pressure. In addition, since the cross-sectional area of the second cavity is smaller, while ensuring stable support, the filling volume is reduced, the filling cost is reduced, the mold bodies are convenient to splice, and the tunnel retention speed is accelerated.

[0047] Second, a sealing layer can be formed by pumping sealing materials into the sealing cavity. When cracks appear in the concrete, the sealing material has strong plasticity and will not crack, thus ensuring that the wall is airtight and reducing or even avoiding subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to 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 any creative work.

[0049] Figure 1 This is a structural diagram of a rapid support wall mold for a gob-side entry retaining structure provided by an embodiment of the present invention;

[0050] Figure 2 This is an exploded view of a gob-side entry retaining rapid support wall mold provided by one embodiment of the present invention;

[0051] Figure 3 This is a structural schematic diagram of a rapid support wall mold for a gob-side entry retaining provided by another embodiment of the present invention;

[0052] Figure 4 This is a structural schematic diagram of a rapid support wall mold for a gob-side entry retaining provided by another embodiment of the present invention;

[0053] Figure 5 yes Figure 2 A partial enlarged view of part A;

[0054] Figure 6 This is one of the structural schematic diagrams of a rapid support wall for a gob-side entry retaining structure provided by an embodiment of the present invention;

[0055] Figure 7 This is a second structural diagram of a rapid support wall for a gob-side entry retaining structure provided by an embodiment of the present invention;

[0056] Figure 8 This is a third structural diagram of a rapid support wall for a gob-side entry retaining structure provided by an embodiment of the present invention;

[0057] Figure 9 yes Figure 8 A partial enlarged view of part B;

[0058] Figure 10 This is a fourth structural diagram of a rapid support wall for a gob-side entry retaining structure provided by an embodiment of the present invention;

[0059] Figure 11 This is a schematic diagram of the construction effect of retaining lanes along the goaf;

[0060] Figure 12 This is a diagram of the construction steps of a rapid support wall for retaining a tunnel along the goaf provided by an embodiment of the present invention.

[0061] Reference numerals:

[0062] 10. Mold body; 100. First baffle; 101. Second baffle; 102. First side plate; 103. Second side plate; 11. Protrusion; 12. Grouting port; 13. Molding cavity; 14. Sealing cavity; 15. Injection port; 16. Tenon; 17. Groove; 20. Skeleton; 200. Connecting end; 30. Flexible mold bag; 300. Connecting part; 40. Connecting piece; 400. Connecting rod; 401. Limiting part; 50. Support body; 500. Support part; 501. Sealing part; 502. Tenon; 503. Groove; 60. Sealing layer; 70. Mining area of this working face; 71. Goaf; 72. Next working face to be mined; 73. Hydraulic unit bracket; 74. Gangue retaining bracket; 75. Concrete pump; 76. Sealing material pump. DETAILED DESCRIPTION

[0063] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0064] In order to facilitate understanding of the rapid support wall mold, wall and construction method for goaf-side tunneling provided by the present invention, its application background is first explained. Goaf-side tunneling can effectively reduce coal loss and improve coal recovery rate. There are two main types of existing goaf-side tunneling technologies. One is to cast concrete walls on one side of the goaf, and the other is to cast concrete piers on one side of the goaf. The principle of both is to replace the traditional retained coal pillars, retain the transportation tunnel of the working face, and provide it for recovery and utilization by the working face of the lower section.

[0065] However, the existing lane retaining walls have a large filling volume, resulting in high filling costs and slow lane retaining speeds, making it difficult to meet actual production needs; sealing materials are sometimes used to fill the gaps between the lane retaining piers, but gaps are inevitable during construction, which are very prone to air leakage. In addition, as the working face advances, pressure increases, and cracks will appear in the lane retaining walls or piers. Frequent repairs are usually required to avoid gas leakage, resulting in a high maintenance workload. Based on the above, the present invention provides a rapid support wall mold, wall, and construction method for a lane retaining along the air, which has the advantages of less filling volume, lower filling cost, faster lane retaining speed, high wall support strength, and better sealing.

[0066] The following combination Figures 1-12 The invention describes a goaf-side tunnel retaining rapid support wall mold, a wall and a construction method.

[0067] Reference Figure 1 and Figure 2A rapid support cavity mold for retaining a tunnel along the goaf includes a mold body 10, a protrusion 11 and a grouting port 12; wherein, a molding cavity 13 is provided inside the mold body 10; the protrusion 11 is provided on the mold body 10, and the protrusion 11 protrudes from the inner surface of the mold body 10 toward the outside of the molding cavity 13, thereby dividing the molding cavity 13 into a first cavity with a larger cross-sectional area and a second cavity with a smaller cross-sectional area located on the side of the first cavity; the grouting port 12 is provided on the mold body 10 and is connected to the molding cavity 13.

[0068] In actual application, concrete can be injected into the forming cavity 13 through the grouting port 12. The concrete is formed into a wall in the forming cavity 13. The part formed in the first cavity has a larger cross-sectional area and is the main part, which mainly plays a supporting role. The part formed in the second cavity is thinner and can form a sealing area between different walls or the main part of the same wall, which can play a sealing role while also playing a certain supporting role; by using multiple templates to cast the wall and splicing the walls together, it can form a stable support for the tunnel and the sealing area can also have a good sealing effect; at the same time, the mold body 10 can form a constraint on the outside of the wall to increase the stability of the entire wall, reducing the problem of cracks in the tunnel wall due to the advancement of the working surface and the increase in pressure; in addition, since the cross-sectional area of the second cavity is smaller, while ensuring stable support, the filling volume is reduced, the filling cost is reduced, the mold bodies 10 are easy to splice, and the tunnel speed is accelerated.

[0069] Reference Figure 2 The mold body 10 includes a pair of opposing baffles and a pair of opposing side panels. The baffles and side panels are sequentially connected to enclose the aforementioned molding cavity 13. The two baffles constitute the two larger surfaces of the mold body 10, and the two side panels constitute the two side surfaces of the mold body 10. The materials and specifications of the baffles and side panels can be selected according to actual needs, as long as the mold body 10 they form can meet the required bearing strength.

[0070] The protrusion 11 is provided on the baffle of the mold body 10. It is understood that the protrusion 11 can be provided on one of the baffles, or can be provided at corresponding positions on both baffles according to actual needs; the protrusion 11 can be arc-shaped, or can be provided in other shapes according to actual needs; there can be one or more protrusions 11, and can be provided in the middle of the baffle or on both sides of the baffle. When there are multiple protrusions 11, the multiple protrusions 11 can be provided at intervals or continuously. In short, no matter how the protrusions 11 are provided, it is only necessary to ensure that the wall cast by this mold can provide good support and sealing effects.

[0071] Specifically, in one embodiment, referring to Figure 2There is one protrusion 11 and it is arranged in the middle of the baffle, so that the second cavity can be formed on both sides of the first cavity.

[0072] In another embodiment, referring to Figure 3 There can be two protrusions 11, which are respectively arranged on both sides of the baffle, so that the molding cavity 13 is divided into two first cavities and a second cavity located between the two first cavities.

[0073] In another embodiment, referring to Figure 4 The length of the baffle can be lengthened, and two protrusions 11 can be set on one baffle at intervals. In this way, the molding cavity 13 can be divided into two first cavities and a second cavity located between and on the sides of the two first cavities.

[0074] It is understood that the mold body 10 includes, but is not limited to, the structures listed above. Other mold bodies 10 that use the same principle to achieve good support and sealing of the lane retaining wall while reducing the filling volume and filling cost are also applicable to the present invention. The following description will take the mold body 10 in which the protrusion 11 is provided in the middle of the baffle as an example.

[0075] Reference Figure 2 The protrusion 11 is arc-shaped and is provided on one of the baffles. For ease of understanding, the baffle provided with the protrusion 11 is the first baffle 100, and the other baffle is the second baffle 101. The protrusion 11 is provided at the center position of the first baffle 100.

[0076] Specifically, the number and layout of the grouting ports 12 can be selected according to the actual grouting requirements, such as the grouting speed, the convenience of construction, etc. In this embodiment, in order to ensure the flatness of the tunnel wall, the first baffle 100 with the protrusion 11 will be facing the goaf 71, and the second baffle 101 will be facing the next generation mining working face 72, so the grouting port 12 is set on the second baffle 101.

[0077] The first baffle 100 and the second baffle 101 are both sandwich structures, thereby forming a sealing cavity 14 for pouring sealing material on the periphery of the forming cavity 13. By filling the sealing material into the sealing cavity 14, two layers of sealing layers 60 can be formed. Even if the wall is fractured due to excessive pressure, the sealing layer 60 can still ensure the sealing performance of the wall, which can replace the existing shotcrete sealing of the retained lane and greatly reduce the maintenance work of the lane in the later stage.

[0078] Both the first baffle 100 and the second baffle 101 are provided with a material injection port 15, which is in communication with the sealing cavity 14 and is used to fill the sealing material into the sealing cavity 14. The position and arrangement of the material injection port 15 can be selected according to actual needs. In this embodiment, to ensure ease of construction, the material injection port 15 on the first baffle 100 passes through and is exposed to the second baffle 101.

[0079] In another embodiment, one of the first baffle 100 and the second baffle 101 can be set as a sandwich structure. In this way, a sealing cavity 14 can be formed on one side of the molding cavity 13. After the sealing material is filled into the sealing cavity 14, a sealing layer 60 can be formed. When the wall is fractured due to excessive pressure, the sealing layer 60 can still play a certain sealing effect to ensure the sealing performance of the wall.

[0080] The first baffle 100 and the second baffle 101 are fixedly connected through one of the side panels. Specifically, this side panel is set as the first side panel 102, and the other side panel is set as the second side panel 103; the plate surface of the first side panel 102 is in contact with the side surface of the first baffle 100 and the second baffle 101 on the same side, and two rows of through holes are provided on the first side panel 102, and the two rows of through holes correspond to the side surfaces of the first baffle 100 and the second baffle 101 respectively. Connecting holes are provided on the sides of the first baffle 100 and the second baffle 101 at positions corresponding to the through holes on the first side panel 102. By using pins, screws, etc. to pass through the through holes on the first side panel 102 and the connecting holes on the first baffle 100 or the second baffle 101 in sequence, the connection and fixation between the first side panel 102, the first baffle 100 and the second baffle 101 can be achieved.

[0081] Specifically, the connection method of the second side plate 103 to the first baffle 100 and the second baffle 101 may be the same as that of the first side plate 102 or may be different.

[0082] Specifically, a tenon 16 is provided on one side of the mold body 10, and a groove 17 adapted to the tenon 16 is provided on the other side. During wall construction, the tenons 16 and grooves 17 on adjacent walls fit together, thereby improving the sealing performance of the wall joints.

[0083] In a specific embodiment, referring to Figure 2 and Figure 5The tenon 16 is integrally formed on the first side panel 102; a first groove extending along the height direction of the first baffle 100 is provided on a side away from the first side panel 102, and a second groove extending along the height direction of the second baffle 101 is provided on a side away from the first side panel 102. The position of the first groove corresponds to the position of the second groove, so that the first groove and the second groove together form a slot, and the second side panel 103 is inserted into the slot, thereby realizing the connection between the second side panel 103 and the first baffle 100 and the second baffle 101. At the same time, the second side panel 103, the first baffle 100 and the second baffle 101 together enclose the above-mentioned embedding groove 17.

[0084] In another embodiment, the second side plate 103 may be connected to the first baffle 100 and the second baffle 101 in the same manner as the first side plate 102 , and the embedding groove 17 is formed on the second side plate 103 .

[0085] The first baffle 100 , the second baffle 101 , the first side plate 102 and the second side plate 103 are connected to each other to form a forming cavity 13 , and concrete is poured into the forming cavity 13 to form a wall.

[0086] Reference Figure 2 A metal frame 20 is positioned within the molding cavity 13. This frame 20 significantly enhances the wall's anti-splitting and load-bearing capabilities. Specifically, the frame 20 is woven from metal reinforcements, such as rebar. The ends of the reinforcements pass through and emerge from the side panels of the mold body 10 to form connecting ends 200, which connect adjacent walls and enhance the strength of the seamless connection.

[0087] The top of the mold body 10 is sealed with a flexible mold bag 30, which is adapted to the cross-sectional shape of the mold body 10. The bottom end is provided with an opening and is connected to the forming cavity 13. During the process of pumping concrete into the forming cavity 13, the flexible mold bag 30 will be filled with concrete and expand, which can conveniently and quickly connect the concrete and the top plate, further achieving the purpose of quickly retaining the lane.

[0088] Specifically, the flexible mold bag 30 and the top end of the mold body 10 can be sealed by riveting.

[0089] The first baffle 100 and the second baffle 101 are connected as a whole through a plurality of connectors 40 , which on one hand prevents the mold from being deformed and compressed during the pouring process, and on the other hand improves the supporting capacity of the concrete wall in the later stage and prevents the wall from being deformed.

[0090] Specifically, the connecting member 40 includes a connecting rod 400 and a pair of limiting portions 401; wherein, the connecting rod 400 passes through the first baffle 100 and the second baffle 101 in sequence and exposes the mold body 10 at both ends; the two limiting portions 401 are respectively connected to the ends of the connecting rod 400 exposed from the mold body 10, and the two limiting portions 401 are respectively abutted against the first baffle 100 and the second baffle 101, so that the first baffle 100 and the second baffle 101 can be restricted between the two limiting portions 401, on the one hand, to prevent the first baffle 100 and the second baffle 101 from deformation during the pouring process, and on the other hand, after the wall is poured, the supporting capacity of the concrete wall can be improved to prevent the wall from deformation.

[0091] To facilitate assembly, at least one of the two limiting portions 401 may be connected to the connecting rod 400 via threads. In this embodiment, the limiting portion 401 abutting against the second baffle 101 is connected to the connecting rod 400 via threads.

[0092] The specific shape of the limiting portion 401 can be selected according to actual needs. Preferably, the limiting portion 401 can be plate-shaped and fit into the surface of the baffle to achieve a better supporting effect.

[0093] It is understandable that the number and arrangement of the connectors 40 can be selected according to actual needs, as long as they meet the required load-bearing effect. In this embodiment, the connectors 40 are evenly arranged in four rows along the width direction of the mold body 10, with four connectors in each row and evenly arranged.

[0094] Specifically, the diameter and thread specifications of the connecting rod 400 can be made consistent with those of the anchor rod, which facilitates the arrangement of cables, pipelines and other infrastructure in the remaining lane.

[0095] A connecting portion 300 is provided at the bottom of the flexible mold bag 30, and an opening is provided at the bottom of the connecting portion 300. When the flexible mold bag 30 is connected to the mold body 10, the connecting portion 300 is located in the molding cavity 13. When pouring concrete, the concrete can enter the flexible mold bag 30 through the connecting portion 300.

[0096] At least one row of through holes is provided on the connecting portion 300 , and the positions of the through holes correspond to the positions of some connecting members 40 . The connecting rods 400 at the corresponding positions pass through the through holes on the connecting portion 300 , thereby stably connecting the flexible mold bag 30 to the mold body 10 .

[0097] It is understandable that the material of the connecting portion 300 and the material of the flexible mold bag 30 can be the same or different, and the two can be fixedly connected or integrally formed, and the specific selection can be made according to actual needs.

[0098] The gob-side tunnel retaining rapid support wall provided by the present invention is described below. The gob-side tunnel retaining rapid support wall described below and the gob-side tunnel retaining rapid support wall mold described above can be referenced to each other.

[0099] Reference Figure 6 and Figure 7 A rapid support wall for retaining a tunnel along an airspace is cast using the above-mentioned rapid support wall mold for retaining a tunnel along an airspace. Concrete slurry is poured into the forming cavity 13 through the grouting port 12, and a concrete support body 50 is formed in the forming cavity 13. Among them, the part formed in the first cavity is the support part 500, which mainly plays a supporting role. The part formed in the second cavity is the sealing part 501, which can form a sealing area between the support parts 500 of the same wall or different walls to play a good sealing role.

[0100] Reference Figure 6 and Figure 8 The skeleton 20 is cast inside the support body 50, and its connecting ends 200 extend out of two sides of the support body 50, playing the role of connecting adjacent walls and improving the connection strength.

[0101] An airtight sealing material with good plastic deformation performance is pumped into the sealing cavity 14 through the injection port 15, thereby forming a sealing layer 60 on the outside of the two larger surfaces of the support body 50. After the wall is spliced, a double-layer seal is formed on the front and back surfaces. When the wall is fractured and leaks, good sealing is still guaranteed. It can replace the existing shotcrete sealing of the retained lane and greatly reduce the maintenance work of the lane in the later stage.

[0102] Reference Figure 9 and Figure 10 After the support body 50 is cast, the two side panels of the template are removed, and the position corresponding to the tenon 16 on the first side panel 102 is formed into a tenon portion 502, and the position corresponding to the groove 17 on the second side panel 103 is formed into a groove portion 503, which facilitates seamless splicing between adjacent walls.

[0103] The connecting member 40 can limit the first baffle 100 and the second baffle 101 between the two limiting portions 401, thereby improving the supporting capacity of the wall and preventing the wall from deforming.

[0104] It is understandable that the shape of the formed wall may vary depending on the shape of the mold body 10 , but the composition and principle of the walls of different shapes are the same.

[0105] The construction method of the gob-side tunnel-retaining rapid support wall provided by the present invention is described below. The construction method of the gob-side tunnel-retaining rapid support wall described below and the gob-side tunnel-retaining rapid support wall mold described above can be referenced to each other.

[0106] Reference Figure 11 and Figure 12 A construction method for a fast supporting wall of a gob-side tunnel retaining structure comprises the following steps:

[0107] S1: Arrange hydraulic unit supports 73 and rock retaining supports 74 around the construction area according to the advancing direction of the working face;

[0108] S2: Level the construction site;

[0109] S3: perform mold assembly;

[0110] S4: Pump concrete into the mold through the grouting port 12 until the flexible mold bag is completely topped and a certain pressure is generated;

[0111] S5: Pump the sealing material into the sealing cavity 14 through the injection port 15 to form a sealing layer 60

[0112] S6: Move the hydraulic unit support 73 and the rock retaining support 74 forward, and connect the delivery pipe of the concrete pump 75 and the delivery pipe of the sealing material pump 76;

[0113] Repeat steps S2-S6 until the construction is completed.

[0114] The novelty of the present invention is that concrete can be injected into the forming cavity 13 through the grouting port 12, and the concrete is formed into a wall in the forming cavity 13. The cross-sectional area of the part formed in the first cavity is larger, which is the main part and mainly plays a supporting role. The part formed in the second cavity is thinner and can form a sealing area between different walls or the main parts of the same wall to play a sealing role. By using multiple templates to cast the wall and splicing the walls together, it is possible to form a stable support for the tunnel and the sealing area can also have a good sealing effect. At the same time, the mold body 10 can form a constraint on the outside of the wall to increase the stability of the entire wall, reducing the problem of cracks in the tunnel wall due to the advancement of the working surface and the increase in pressure. In addition, since the cross-sectional area of the second cavity is smaller, while ensuring stable support, the filling volume is reduced, the filling cost is reduced, the mold bodies 10 are convenient to splice, and the tunnel retention speed is accelerated.

[0115] A sealing layer 60 can be formed by pumping sealing material into the sealing cavity 14. When cracks occur in the concrete, the sealing layer 60 has strong plasticity and will not crack, thereby ensuring that the wall is airtight and reducing or even avoiding subsequent maintenance.

[0116] 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 various embodiments of the present invention.

Claims

1. A rapid support wall mold for gob-side tunnel retaining, characterized in that: include: A mold body (10), wherein a molding cavity (13) is provided in the mold body (10); a protrusion (11), the protrusion (11) being located on the mold and protruding from the inner surface of the mold body (10) toward the outside of the molding cavity (13), dividing the molding cavity (13) into a first cavity with a larger cross-sectional area and a second cavity located on the side of the first cavity and having a smaller cross-sectional area; A grouting port (12) is provided on the mold body (10) and communicates with the molding cavity (13); It also includes a skeleton (20) disposed in the molding cavity (13); The skeleton (20) is woven from ribs, and the ends of the ribs pass through and are exposed from the side of the mold body (10) to form connecting ends (200); One side surface of the mold body (10) is provided with a tenon (16), and the other side surface is provided with a groove (17) adapted to the tenon (16); The mold body (10) includes a pair of baffles and a pair of side plates arranged opposite to each other, and the molding cavity (13) is enclosed by the baffles and the side plates; the protrusion (11) is provided on at least one of the two baffles; The two baffles are connected into a whole through a plurality of connecting members (40), and the connecting members (40) include: A connecting rod (400) passes through the two baffles in sequence; A pair of limiting portions (401) are spaced apart and arranged on the connecting rod (400) and respectively abut against the two baffles, thereby limiting the two baffles between the two limiting portions (401).

2. The rapid support wall mold for gob-side entry retaining according to claim 1 is characterized in that: A sealing cavity (14) for injecting sealing material is provided on the mold body (10) outside the molding cavity (13).

3. The rapid support wall mold for gob-side entry retaining according to claim 1 is characterized in that: It also includes a flexible mold bag (30) sealed to the top end of the mold body (10).

4. A rapid support wall for retaining a tunnel along the goaf, characterized in that: The structure is constructed using the mold for the rapid support wall of the gob-side entry retaining structure as described in any one of claims 1 to 3, and further comprises: A support body (50) is formed in the molding cavity (13); the support body (50) comprises a support portion (500) formed in the first cavity, and a sealing portion (501) formed in the second cavity.

5. The rapid support wall for gob-side entry retaining according to claim 4 is characterized in that: Two opposite sides of the mold body (10) are connected via the connecting piece (40); The connecting rod (400) passes through the mold body (10) and the support body (50) in sequence; A pair of the limiting portions (401) are respectively in contact with two opposite surfaces of the mold body (10).

6. A construction method for a fast supporting wall for a gob-side tunnel retaining, characterized in that: The method for constructing the rapid supporting wall according to claim 4 or 5 comprises the following steps: S1: Arrange the hydraulic unit support (73) and the rock retaining support (74); S2: Level the construction site; S3: assemble the mold; S4: Pumping concrete into the mold body (10) until the flexible mold bag (30) is completely connected to the top and generates a certain pressure; S5: Pumping sealing material into the sealing cavity (14); S6: Move the hydraulic unit support (73) and the rock retaining support (74) forward, and connect the delivery pipe of the concrete pump (75) and the delivery pipe of the sealing material pump (76); Repeat steps S2-S6.

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