A filling type support tooling for a gob area and a gob area filling support method

Abstract

The present invention discloses a filling type support tooling for a goaf and a goaf filling support method, which includes a tooling base having a filling flow channel and multiple sets of filling support units spaced on the tooling base; the filling support unit includes a connecting seat, a support sleeve and a support top cover. Before filling, the support sleeve of the filling type support tooling is a hollow structure, which is light in weight and convenient for handling and layout in the goaf. After the filling type support tooling is laid in place, a filling material is injected into the filling type support tooling, and the support sleeve is filled with the filling material, so that the support sleeve becomes a solid structure, greatly improving the structural strength of the support sleeve, enhancing the support effect on the overlying strata of the goaf, being able to effectively inhibit the collapse of the overlying strata, effectively inhibit the surface subsidence, effectively inhibit the development depth of the fracture development zone, and also play a role in water conservation.

Description

Technical Field

[0001] The present invention relates to the technical field of goaf support, and particularly to a filling type support tooling for a goaf and a goaf filling support method. Background Art

[0002] During the process of coal mining, goafs will be formed. In order to reduce the collapse of the rock strata and the ground surface above the goafs, in the prior art, methods such as goaf filling and support are adopted to support the rock strata above the goafs.

[0003] For example, the Chinese invention patent with the publication number CN112360549A discloses a filling device and a filling method, which adopt the method of concrete strip filling to fill the goaf. Its defect is that it needs to be filled in sections, and each time it has to wait for the concrete to solidify before it can be demolded for the next stage of filling, with slow efficiency.

[0004] For example, the Chinese invention patent with the publication number CN114060069A discloses a pre - support operation method for the goaf of a shallow - buried - depth coal mine, which adopts the method of arranging a tension - type support frame behind a hydraulic support to support the rock strata above the goaf. Its defect is that the support effect of the tension - type support frame is limited, and it is necessary to densely arrange the tension - type support frames. Its support effect basically depends on the structural strength of the support rods. When the rock strata above collapse, the support rods will be bent or broken to a large extent, and even the tension - type support frame will be crushed. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a filling type support tooling for a goaf and a goaf filling support method. By injecting filling materials into the filling type support tooling arranged in place, and using the filling materials to fill the support sleeve, the support sleeve becomes a solid structure, greatly improving the structural strength of the support sleeve, enhancing the support effect on the overlying rock strata of the goaf, being able to effectively inhibit the collapse of the overlying rock strata, and effectively inhibiting the ground surface subsidence.

[0006] The technical solution of the present invention provides a filling type support tooling for a goaf, including a tooling base having a filling flow channel and multiple sets of filling support units spacedly arranged on the tooling base;

[0007] A flow channel inlet for connecting with a filling pipeline of a filling device is arranged on the front end face of the tooling base, and a plurality of flow channel outlets are spacedly arranged on the top surface of the tooling base, and a one - way valve is arranged in each flow channel outlet;

[0008] The filling support unit includes a connecting seat fixedly connected with the tooling base, a support sleeve connected with the connecting seat and used for accommodating filling materials, and a support top cover connected to the upper end of the support sleeve;

[0009] Each of the connecting seats has a through hole, and each of the through holes of the connecting seats is correspondingly docked with a runner outlet;

[0010] An exhaust passage communicating with the support sleeve is provided in the support top cover, and the exhaust port of the exhaust passage is arranged on the side surface of the support top cover;

[0011] Wherein, when the filling type support tooling is in a use state in the goaf, the support sleeve is filled with filling material.

[0012] In one optional technical solution, the support sleeve includes a fixed sleeve fixedly connected to the connecting seat and a lifting sleeve slidably connected to the fixed sleeve. The upper end of the lifting sleeve extends above the fixed sleeve, and the support top cover is connected to the upper end of the lifting sleeve;

[0013] The lifting sleeve can be lifted by the filling material entering the support sleeve to be in a raised state;

[0014] When the filling type support tooling is in an initial state, the lifting sleeve is in a lowered state;

[0015] When the filling type support tooling is in a use state, the lifting sleeve is in a raised state.

[0016] In one optional technical solution, the lower end of the lifting sleeve has a lower baffle, the upper end opening of the fixed sleeve is provided with an upper baffle for stopping the upward movement of the lower baffle, and a telescopic pin for preventing the lower baffle from falling is provided on the barrel wall of the fixed sleeve below the upper baffle;

[0017] When the lifting sleeve is in a lowered state, the lower baffle rests on the connecting seat, and the through hole of the connecting seat is in the lower end opening of the lifting sleeve;

[0018] When the lifting sleeve rises to the limit position, the lower baffle rests on the telescopic pin.

[0019] In one optional technical solution, the filling runner is in a grid shape and includes a plurality of runner intersections;

[0020] Each of the runner outlets is arranged at one of the runner intersections.

[0021] In one optional technical solution, a plurality of the runner inlets are spacedly arranged on the front end face of the tooling base.

[0022] In one of the optional technical solutions, a plurality of top surface grooves are provided at intervals on the top surface of the tooling base, each of the flow channel outlets is located in one of the top surface grooves, and an annular mounting groove is formed between the groove wall of the top surface groove and the flow channel outlet;

[0023] The connecting seat is installed in the annular mounting groove through a locking piece, and the flow channel outlet is inserted into the supporting sleeve through the connecting seat through-hole.

[0024] In one of the optional technical solutions, a connecting channel is provided in the upper end wall of the support sleeve, one end of the connecting channel is opened on the inner surface of the upper end wall, and the other end of the connecting channel is opened on the top surface of the upper end wall and is connected to the exhaust channel.

[0025] In one of the optional technical solutions, a plurality of sets of the filling support units are arranged in a matrix, and a connecting rod is connected between any two adjacent support sleeves.

[0026] In one of the optional technical solutions, the filler includes concrete, tailings sand, or a mixture of concrete and tailings sand.

[0027] The technical solution of the present invention also provides a method for filling and supporting a goaf, which adopts any of the aforementioned filling and supporting tools;

[0028] The steps include:

[0029] S01: pre-arranging the filling equipment and the filling pipeline in the tunnel;

[0030] S02: transporting the filling type support tooling to the rear of the hydraulic support of the coal mining working face in sequence;

[0031] S03: As the coal mining face advances, the filling type support tooling is arranged at intervals behind the hydraulic support, and the filling pipe is connected to the flow channel inlet of the arranged filling type support tooling;

[0032] S04: injecting a filler into the filler-type support tooling by using the filling device, and filling the support sleeve with the filler;

[0033] S05: After the supporting sleeve is filled with the filling material, the filling pipe connected to the flow channel inlet is removed to carry out the next cycle of operation.

[0034] The above technical solution has the following beneficial effects:

[0035] The filling type support tooling for a gob area and the gob area filling support method provided by the present invention. Before filling, the support sleeve of the filling type support tooling is a hollow structure, which is light in weight, convenient to carry and deploy in the gob area. After the filling type support tooling is deployed in place, a filling material is injected into the filling type support tooling, and the support sleeve is filled with the filling material, making the support sleeve a solid structure, greatly improving the structural strength of the support sleeve, enhancing the support effect on the overlying strata in the gob area, being able to effectively inhibit the collapse of the overlying strata, effectively inhibit the surface subsidence, effectively inhibit the development depth of the fracture development zone, and also playing a role in water conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Referring to the drawings, the disclosure of the present invention will become more understandable. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the figures:

[0037] Figure 1 Schematic diagram of the filling type support tooling arranged in the gob area supporting the collapsed overlying strata in the gob area filling support method provided by an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of arranging a filling device and filling pipes in a roadway and arranging the filling type support tooling behind a hydraulic support in the gob area filling support method provided by an embodiment of the present invention;

[0039] Figure 3 Three-dimensional view of the filling type support tooling provided by an embodiment of the present invention;

[0040] Figure 4 For Figure 3 Cross-sectional view along A-A direction;

[0041] Figure 5 Partial enlarged view of the flow channel outlet provided on the top surface of the tooling base;

[0042] Figure 6 For Figure 5 Cross-sectional view along B-B direction;

[0043] Figure 7 Three-dimensional view of the filling support unit provided by an embodiment of the present invention;

[0044] Figure 8 Cross-sectional view of the filling support unit provided by an embodiment of the present invention;

[0045] Figure 9 Cross-sectional view of the lower end of the support sleeve connected to the tooling base;

[0046] Figure 10 Cross-sectional view of the support sleeve filled with the filling material;

[0047] Figure 11 A perspective view of the filling support tooling provided by another embodiment of the present invention, wherein the lifting sleeve is in a lowered state;

[0048] Figure 12 is Figure 11 the perspective view of the filling support tooling shown when the lifting sleeve is in a raised state;

[0049] Figure 13 A sectional view of the filling support unit when the lifting sleeve is in a lowered state;

[0050] Figure 14 A schematic diagram showing that a lower baffle is provided at the lower end of the lifting sleeve;

[0051] Figure 15 A schematic diagram of the installation of the expansion pin;

[0052] Figure 16 A schematic diagram showing that during the first filling stage, the filling material first fills the lifting sleeve;

[0053] Figure 17 A schematic diagram showing that during the second filling stage, the filling material jacks up the lifting sleeve and the fixed sleeve is also filled with the filling material;

[0054] Figure 18 A schematic diagram showing that when the lifting sleeve rises to the limit position, the lower baffle falls on the expansion pin. Specific embodiments

[0055] The following further describes the specific embodiments of the present invention in conjunction with the drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0056] As Figures 1 - 10 shown, a filling support tooling 9 for a goaf 7 provided by an embodiment of the present invention includes a tooling base 91 having a filling flow channel 911 and multiple sets of filling support units 92 spaced apart on the tooling base 91.

[0057] A flow channel inlet 912 for connecting to a filling pipeline 81 of a filling device 8 is provided on the front end face of the tooling base 91, and a plurality of flow channel outlets 913 are spaced apart on the top surface of the tooling base 91, and a one-way valve 914 is provided in each flow channel outlet 913.

[0058] The filling and support unit 92 includes a connecting seat 921 fixedly connected to the tooling base 91, a support sleeve 922 connected to the connecting seat 921 and used to accommodate the filling material 10, and a support top cover 923 connected to the upper end of the support sleeve 922.

[0059] Each connecting seat 921 has a connecting seat through-hole 9211, and each connecting seat through-hole 9211 is correspondingly docked with a flow channel outlet 913.

[0060] An exhaust channel 9231 communicating with the support sleeve 922 is provided in the support top cover 923, and an exhaust port 9232 of the exhaust channel 9231 is arranged on the side surface of the support top cover 923.

[0061] Among them, when the filling support tooling 9 is in a use state in the goaf 7, the support sleeve 922 is filled with the filling material 10.

[0062] In the present invention, the filling support tooling 9 being in a use state means the state after the filling support tooling 9 is filled with the filling material 10 and can support the overlying strata 2.

[0063] The filling support tooling 9 provided by the present invention is used in the goaf 7 to support the overlying strata 2 above.

[0064] As Figures 1 - 2 shown, during coal mining, the coal mining face mines the coal seam 1 along the arrow 2, and the hydraulic support 6 moves along with the coal mining face, thus forming a goaf 7 at the back. The filling support tooling 9 is carried to the back of the hydraulic support 6 in advance, and then is pushed to a designated position in the goaf 7 through equipment such as hydraulic cylinders. Filling equipment 8, such as a grouting pump, a sand pumping pump, etc., is arranged in the roadway 5 on both sides or one side of the coal mining face in advance for injecting the filling material 10 into the filling support tooling 9 through the filling pipeline 81. The filling material 10 can be concrete, sand, tailings sand, etc., to improve the structural strength and support capacity of the filling support tooling 9, inhibit the caving amplitude of the overlying strata 2, reduce the depth of the fissure development zone developing downward from the aquifer 3, play a water conservation role, and also reduce the subsidence of the surface layer 4.

[0065] Specifically, the filling support tooling 9 includes a rectangular tooling base 91 and multiple sets of filling and support units 92. The multiple sets of filling and support units 92 are installed at intervals above the tooling base 91, and the multiple sets of filling and support units 92 are preferably arranged in a matrix.

[0066] The tooling base 91 is provided with a filling runner 911. The runner inlet 912 of the filling runner 911 is arranged on the front end face of the tooling base 91 and is used to connect with the filling pipeline 81 of the filling equipment 8. The runner outlet 913 of the filling runner 911 is arranged on the top surface of the tooling base 91. A plurality of runner outlets 913 are arranged at intervals on the top surface of the tooling base 91. The number of the runner outlets 913 is equal to the number of the filling support units 92. Each set of filling support units 92 is correspondingly connected to one runner outlet 913. Preferably, the plurality of runner outlets 913 are arranged in a matrix on the top surface of the tooling base 91.

[0067] A check valve 914 is arranged in each runner outlet 913, which only allows the filling material 10 to flow into the filling support unit 92 and prevents the filling material 10 from flowing out of the support sleeve 922 of the filling support unit 92, so as to keep the support sleeve 922 filled with the filling material 10.

[0068] The filling support unit 92 includes a connecting seat 921, a support sleeve 922 and a support top cover 923 which are connected in sequence.

[0069] Preferably, the connecting seat 921, the support sleeve 922 and the support top cover 923 are integrally arranged, and the structural strength is high.

[0070] Preferably, the connecting seat 921 adopts a rectangular bottom plate, the support sleeve 922 adopts a square pipe, and the support top cover 923 adopts a rectangular cover plate, which is convenient for installation and positioning.

[0071] The connecting seat 921 is fixedly connected to the tooling base 91. The connecting seat 921 has a connecting seat through hole 9211 for the filling material 10 to enter the support sleeve 922. Each connecting seat 921 is connected to the area of the tooling base 91 where there is a runner outlet 913. Each connecting seat through hole 9211 is correspondingly docked with a runner outlet 913, and the filling material 10 flowing out of the runner outlet 913 will enter the support sleeve 922 through the connecting seat through hole 9211.

[0072] The support top cover 923 is arranged at the upper end of the support sleeve 922 to close the upper end of the support sleeve 922 and play a role of a cap. The support top cover 923 is also used to support the overlying strata 2. Therefore, the size or area of the support top cover 923 is set to be larger than the size or area of the support sleeve 922 to increase the contact area with the overlying strata 2.

[0073] When filling the support sleeve 922, it is necessary to discharge the gas in the support sleeve 922. Otherwise, the gas in the support sleeve 922 will prevent the filling material 10 from entering the support sleeve 922. Thus, an exhaust passage 9231 is provided in the support top cover 923. One end of the exhaust passage 9231 is open at the bottom surface of the support top cover 923 or at the inner surface of the support sleeve 922, and the exhaust port 9232 of the exhaust passage 9231 is provided on the side surface of the support top cover 923, so that the overlying rock formation 2 above will not block the exhaust port 9232.

[0074] When arranging the filling type support tooling 9 in the goaf 7, the support sleeve 922 is of a hollow structure, which is light in weight and convenient for handling and arranging in the goaf 7. After the filling type support tooling 9 is arranged in place, the filling material 10 is then injected into the filling type support tooling 9, and the support sleeve 922 is filled with the filling material 10, making the support sleeve a solid structure, greatly improving the structural strength of the support sleeve 922, enhancing the support effect on the overlying rock formation 2 of the goaf 7, being able to effectively inhibit the collapse amplitude of the overlying rock formation 2, effectively inhibiting surface subsidence, effectively inhibiting the development depth of the fissure development zone, and also playing a role in water conservation.

[0075] The height of the filling type support tooling 9 is slightly less than the height of the goaf 7, and the specific height requirement can be set according to the actual situation. After the filling type support tooling 9 is arranged and filled, when the overlying rock formation 2 collapses, it will fall on the filling type support tooling 9 below, and the support top cover 923 supports the overlying rock formation 2, and the solid support sleeve 922 acts as a column and will not be easily bent or broken, and can effectively inhibit the collapse amplitude of the overlying rock formation 2.

[0076] In one embodiment, as Figures 11 - 13 and Figures 16 - 17 shown, the support sleeve 922 includes a fixed sleeve 9221 fixedly connected to the connection seat 921 and a lifting sleeve 9222 slidably connected to the fixed sleeve 9221. The upper end of the lifting sleeve 9222 extends above the fixed sleeve 9221, and the support top cover 923 is connected to the upper end of the lifting sleeve 9222.

[0077] The lifting sleeve 9222 can be lifted by the filling material 10 entering the support sleeve 922 to be in a raised state.

[0078] When the filling type support tooling 9 is in the initial state, the lifting sleeve 9222 is in a lowered state.

[0079] When the filling type support tooling 9 is in the use state, the lifting sleeve 9222 is in a raised state.

[0080] In this embodiment, the support sleeve 922 adopts a lifting structure. When not filled, the support sleeve 922 is in a contracted state with a low height, which is convenient for underground transportation. When filled, the support sleeve 922 is lifted by the action of the filling material 10 to support the overlying strata 2.

[0081] Specifically, the support sleeve 922 includes a fixed sleeve 9221 and a lifting sleeve 9222. The lifting sleeve 9222 is thinner than the fixed sleeve 9221 and is slidably connected therein. The lower end of the fixed sleeve 9221 is fixedly connected to the connecting seat 921. The upper end of the lifting sleeve 9222 extends above the fixed sleeve 9221, and the support top cover 923 is connected to the upper end of the lifting sleeve 9222.

[0082] When the filling material 10 enters the lifting sleeve 9222 at a relatively high flow rate and is blocked by the support top cover 923, the impact force of the filling material 10 will lift the lifting sleeve 9222 to make it in a lifted state.

[0083] When the filling support tooling 9 is in the initial state, the lifting sleeve 9222 is in a lowered state. At this time, the height dimension of the entire filling support tooling 9 is small, which is convenient for underground transportation.

[0084] When the filling support tooling 9 is in the use state, the lifting sleeve 9222 is in a lifted state, and the support top cover 923 is at a relatively high position to support the overlying strata 2. Due to the action of the one-way valve 914, the filling material 10 remains in the support sleeve 9222 and does not flow out, so the lifting sleeve 9222 can remain in the lifted state.

[0085] Another advantage of using the lifting sleeve 9222 is that when the overlying strata 2 collapses and presses on the support top cover 923, the pressure will cause the lifting sleeve 9222 to have a downward movement tendency. If the filling material 10 used in the support sleeve 9222 is sand, tailings sand, etc., it will be compacted and there will be no large displacement. The lifting sleeve 9222 will drive the support top cover 923 to adaptively move slightly downward, playing a certain buffering role and further reducing the risk of the support sleeve 9222 being crushed.

[0086] In one of the embodiments, as Figures 13 - 18 shown, the lower end of the lifting sleeve 9222 has a lower baffle 9222a. The upper end opening of the fixed sleeve 9221 is provided with an upper baffle 9221a for stopping the upward movement of the lower baffle 9222a. Below the upper baffle 9221a on the barrel wall of the fixed sleeve 9221, there is a telescopic pin 9221b for preventing the lower baffle 9222a from falling.

[0087] When the lifting sleeve 9222 is in the lowered state, the lower baffle 9222a rests on the connecting seat 921, and the connecting seat through hole 9211 is in the lower end opening of the lifting sleeve 9222.

[0088] When the lifting sleeve 9222 is raised to the extreme position, the lower baffle 9222a lands on the telescopic pin 9221b.

[0089] In this embodiment, a scheme of arranging a lower baffle 9222a at the lower end of the lifting sleeve 9222, an upper baffle 9221a at the upper end opening of the fixed sleeve 9221, and a telescopic pin 9221b on the barrel wall of the fixed sleeve 9221 is adopted to limit the rising position of the lifting sleeve 9222.

[0090] The lower baffle 9222a is annular and is arranged on the outer peripheral surface at the lower end of the lifting sleeve 9222. The upper baffle 9221a is annular and is arranged on the inner surface of the upper end opening of the fixed sleeve 9221. The telescopic pin 9221b is telescopic under the action of a spring, is arranged on the barrel wall of the fixed sleeve 9221, and is below the upper baffle 9221a. The distance between the telescopic pin 9221b and the upper baffle 9221a is slightly greater than the thickness of the lower baffle 9222a.

[0091] A plurality of telescopic pins 9221b can be arranged along the circumferential direction on the barrel wall of the fixed sleeve 9221. The end face of the telescopic pin 9221b is a telescopic pin inclined surface 9221c, and the telescopic pin inclined surface 9221c gradually slopes upward along the direction from the barrel wall of the fixed sleeve 9221 to the central axis.

[0092] The end face of the lower baffle 9222a is a lower baffle inclined surface 9222b, and its inclination mode is the same as that of the telescopic pin inclined surface 9221c.

[0093] When the lifting sleeve 9222 is lifted by the action of the filler 10, the lower baffle 9222a rises together, and the telescopic pin inclined surface 9221c is forced by the lower baffle inclined surface 9222b to contract the telescopic pin 9221b. After the lower baffle 9222a reaches above the telescopic pin 9221b, the telescopic pin 9221b extends out to play a role in restricting the fall of the lower baffle 9222a.

[0094] In one of the embodiments, as Figure 4 shown, the filling flow channel 911 is in a grid shape, and the filling flow channel 911 includes a plurality of flow channel intersections 9111. Each flow channel outlet 913 is arranged at a flow channel intersection 9111.

[0095] In this embodiment, the filling runner 911 is in a grid shape, which includes a plurality of transverse runners and a plurality of longitudinal runners. The longitudinal runners extend along the front-back direction or the length direction of the tooling base 91, and the transverse runners extend along the left-right direction or the width direction of the tooling base 91. The runner inlet 912 is arranged at the front end of the longitudinal runner. Each longitudinal runner intersects with a plurality of transverse runners respectively, and each transverse runner intersects with a plurality of longitudinal runners respectively. The intersection of the transverse runner and the longitudinal runner is the runner intersection 9111. A runner outlet 913 is arranged at each runner intersection 9111. The filling material 10 can reach each runner intersection 9111 through the transverse runners and the longitudinal runners, and then enter the support sleeve 922 through the runner outlet 913, improving the filling speed.

[0096] In one embodiment, as Figures 3 - 4 and Figures 11 - 12 shown, a plurality of runner inlets 912 are spacedly arranged on the front end face of the tooling base 91. During filling, each runner inlet 912 is connected to a filling pipe 81, and the filling speed is fast.

[0097] In one embodiment, as Figures 5 - 9 shown, a plurality of top surface grooves are spacedly arranged on the top surface of the tooling base 91. Each runner outlet 913 is located in a top surface groove, and an annular installation groove 915 is formed between the groove wall of the top surface groove and the runner outlet 913.

[0098] The connecting seat 921 is installed in the annular installation groove 915 through the locking member 916, and the runner outlet 913 is inserted into the 922 through the connecting seat through hole 9211.

[0099] In this embodiment, a top surface groove is formed on the top surface of the tooling base 91 in the area where the runner outlet 913 is arranged. The pipe wall of the runner outlet 913 extends into the top surface groove, and an annular installation groove 915 is formed between the pipe wall of the runner outlet 913 and the groove wall of the top surface groove. During assembly, the connecting seat 921 is placed in the annular installation groove 915, and the runner outlet 913 is inserted into the support sleeve 922 through the connecting seat through hole 9211, and the filling material 10 can be directly output into the support sleeve 922. An internal threaded hole is provided at the bottom of the annular installation groove 915, and a connecting through hole is provided on the connecting seat 921. The locking member 916, such as a bolt, passes through the connecting through hole on the connecting seat 921 and is connected to the internal threaded hole, thereby fastening the connecting seat 921 to the tooling base 91.

[0100] In one embodiment, as Figure 8 shown, a communication channel 9223 is provided in the upper end barrel wall of the support sleeve 922. One end opening of the communication channel 9223 is arranged on the inner surface of the upper end barrel wall, and the other end opening of the communication channel 9223 is arranged on the top surface of the upper end barrel wall and is communicated with the exhaust channel 9231.

[0101] During filling, the filler 10 will quickly flow into the support sleeve 922 and first rush to the bottom surface of the support top cover 923. If the opening of the exhaust channel 9231 is arranged on the bottom surface of the support top cover 923, it will be blocked by the filler 10. The filler 10 entering the exhaust channel 9231 will also cause blockage, affecting the exhaust of the support sleeve 922.

[0102] In this embodiment, a connecting passage 9223 is provided in the upper end wall of the support sleeve 922. The longitudinal section of the connecting passage 9223 is L-shaped, one end of which is opened on the inner surface of the upper end wall and communicates with the inner cavity of the support sleeve 922, and the other end of which is opened on the top surface of the upper end wall and communicates with the exhaust passage 9231. With such a configuration, the filler 10 that is first rushed in will rush toward the bottom surface of the support top cover 923, and will not stick to the inner wall surface of the support sleeve 922, so it will not block the air inlet of the connecting passage 9223, nor will it rush into the connecting passage 9223, which can ensure that the gas in the support sleeve 922 will be discharged smoothly in a slightly longer period of time before filling the support sleeve 922, and will not affect the filling of the filler 10.

[0103] In one embodiment, if Figure 3 and Figures 11 - 12 As shown, a plurality of filling support units 92 are arranged in a matrix, and a connecting rod 93 is connected between any two adjacent support sleeves 922, so that adjacent support sleeves 922 are interconnected, thereby improving the structural strength and better supporting the overlying rock layer 2.

[0104] In one embodiment, the filling material 10 includes concrete, tailings sand, or a mixture of concrete and tailings sand.

[0105] Concrete is a commonly used building material in the construction field. It is injected into the support sleeve 922 in a fluid manner and forms a hard column after solidification.

[0106] Tailings sand is the waste after metal ore screening, in the form of sand or powder, and is generally accumulated in tailings ponds. In some areas, there are tailings ponds around coal mines. The tailings sand in the tailings ponds is abandoned and not used, which poses risks such as mudslides and landslides.

[0107] In this embodiment, the tailings sand can be transported to the coal mine site and transported into the tunnel 5 to be used as the material of the filling material 10, thereby saving resources.

[0108] Tailings sand can be filled as sand, mixed with concrete, or mixed with water, gelling agent and other materials.

[0109] like Figures 1 - 2As shown in the figure, a gob filling and supporting method provided by an embodiment of the present invention uses the filling type supporting tooling 9 of any of the foregoing embodiments.

[0110] The gob filling and supporting method includes the following steps:

[0111] S01: Pre-arrange filling equipment 8 and filling pipelines 81 in the roadway 5.

[0112] S02: Sequentially carry the filling type supporting tooling 9 to the rear of the hydraulic support 6 at the coal mining face.

[0113] S03: As the coal mining face advances, arrange the filling type supporting tooling 9 at intervals behind the hydraulic support, and connect the filling pipeline 81 to the flow channel inlet 912 of the arranged filling type supporting tooling 9.

[0114] S04: Use the filling equipment 8 to inject filling material 10 into the filling type supporting tooling 9, and use the filling material 10 to fill the supporting sleeve 922.

[0115] S05: After the supporting sleeve 922 is filled with the filling material 10, remove the filling pipeline 81 connected to the flow channel inlet 912 and perform the operations of the next cycle.

[0116] The operations of the next cycle refer to the advancement of the coal mining face, the forward movement of the filling equipment 8 and the hydraulic support 6, and the preparation of the filling type supporting tooling 9 behind the hydraulic support 6, etc.

[0117] For the gob filling and supporting method provided by the present invention, before filling, the supporting sleeve 922 of the filling type supporting tooling 9 is a hollow structure, which is light in weight and convenient for handling and arranging in the gob 7. After the filling type supporting tooling 9 is arranged in place, then inject the filling material 10 into the filling type supporting tooling 9, and use the filling material 10 to fill the supporting sleeve 922, so that the supporting sleeve becomes a solid structure, greatly improving the structural strength of the supporting sleeve 922, enhancing the supporting effect on the overlying strata 2 of the gob 7, being able to effectively inhibit the collapse of the overlying strata 2, effectively inhibit the surface subsidence, effectively inhibit the development depth of the fracture development zone, and also play a role in water conservation.

[0118] According to needs, the above technical solutions can be combined to achieve the best technical effects.

[0119] The above are only the principles and preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, based on the principle of the present invention, several other variants can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A filling type support tool for goaf, characterized in that: It comprises a tooling base having a filling flow channel and a plurality of filling support units arranged at intervals on the tooling base; The front end surface of the tooling base is provided with a flow channel inlet for connecting to a filling pipe of a filling device, and the top surface of the tooling base is provided with a plurality of flow channel outlets at intervals, each of which is provided with a one-way valve; The filling support unit comprises a connection seat fixedly connected to the tooling base, a support sleeve connected to the connection seat and used to accommodate the filling material, and a support top cover connected to the upper end of the support sleeve; The tooling base is rectangular, the tooling base adopts a rectangular bottom plate, the support sleeve adopts a square tube, the support top cover adopts a rectangular cover plate, and multiple sets of the filling support units are arranged in a matrix on the tooling base; Each of the connection seats has a connection seat through hole, and each of the connection seat through hole is correspondingly connected to a flow channel outlet; The support top cover is provided with an exhaust passage connected with the support sleeve, and the exhaust port of the exhaust passage is provided on the side of the support top cover; Among them, the height of the filling type support tooling is slightly smaller than the height of the goaf. During coal mining, the filling type support tooling is moved to the rear of the hydraulic support in advance, and then pushed to the designated position in the goaf by the hydraulic cylinder. After the filling type support tooling is deployed in place, filler is injected into the filling type support tooling. When the filling type support tooling is in use in the goaf, the support sleeve is filled with filler, and the support sleeve becomes a solid structure. When the overlying rock stratum collapses, the support top cover supports the overlying rock stratum to support the overlying rock stratum in the goaf, suppress the collapse amplitude of the overlying rock stratum, suppress surface collapse and suppress the development depth of the fracture development zone.

2. The filling type support tool for goaf according to claim 1 is characterized in that: The support sleeve comprises a fixed sleeve fixedly connected to the connecting seat and a lifting sleeve slidably connected to the fixed sleeve, the upper end of the lifting sleeve extends above the fixed sleeve, and the support top cover is connected to the upper end of the lifting sleeve; The lifting sleeve can be lifted up by the filling material entering into the supporting sleeve so as to be in a raised state; When the filling type supporting tooling is in the initial state, the lifting sleeve is in the descending state; When the filling-type supporting tool is in use, the lifting sleeve is in a raised state.

3. A filling type support tool for goaf according to claim 2, characterized in that: The lower end of the lifting sleeve is provided with a lower baffle, the upper end of the fixed sleeve is provided with an upper baffle for stopping the lower baffle from rising, and a telescopic pin for preventing the lower baffle from falling is provided on the wall of the fixed sleeve below the upper baffle; When the lifting sleeve is in a descending state, the lower baffle falls on the connecting seat, and the connecting seat through hole is located in the lower end opening of the lifting sleeve; When the lifting sleeve is raised to the limit position, the lower baffle falls on the telescopic pin.

4. The filling type support tool for goaf according to claim 1 is characterized in that: The filling flow channel is in a grid shape, and the filling flow channel includes a plurality of flow channel intersections; Each of the flow channel outlets is arranged at a flow channel intersection.

5. The filling type support tooling for goaf according to claim 1 is characterized in that: The front end surface of the tooling base is provided with a plurality of flow channel inlets at intervals.

6. The filling type support tool for goaf according to claim 1, characterized in that: The top surface of the tooling base is provided with a plurality of top surface grooves at intervals, each of the flow channel outlets is located in one of the top surface grooves, and an annular mounting groove is formed between the groove wall of the top surface groove and the flow channel outlet; The connecting seat is installed in the annular mounting groove through a locking piece, and the flow channel outlet is inserted into the supporting sleeve through the connecting seat through-hole.

7. The filling type support tool for goaf according to claim 1, characterized in that: A communication channel is provided in the upper end wall of the support sleeve, one end of the communication channel is opened on the inner surface of the upper end wall, and the other end of the communication channel is opened on the top surface of the upper end wall and is connected to the exhaust channel.

8. The filling type support tool for goaf according to claim 1, characterized in that: A connecting rod is connected between any two adjacent support sleeves.

9. The filling type support tool for goaf according to claim 1, characterized in that: The filling material includes concrete, tailings sand or a mixture of concrete and tailings sand.

10. A method for filling and supporting a goaf, characterized in that: Using the filling type support tooling according to any one of claims 1 to 9; The steps include: S01: pre-arranging the filling equipment and the filling pipeline in the tunnel; S02: transporting the filling type support tooling to the rear of the hydraulic support of the coal mining working face in sequence; S03: As the coal mining face advances, the filling type support tooling is arranged at intervals behind the hydraulic support, and the filling pipe is connected to the flow channel inlet of the arranged filling type support tooling; S04: injecting a filler into the filler-type support tooling by using the filling device, and filling the support sleeve with the filler; S05: After the supporting sleeve is filled with the filling material, the filling pipe connected to the flow channel inlet is removed to carry out the next cycle of operation.

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