Filling type supporting tool for goaf and goaf filling supporting method

Abstract

The invention discloses a filling type supporting tool for a goaf and a goaf filling supporting method. The filling type supporting tool comprises a tool base with a filling runner and a plurality of sets of filling supporting units arranged on the tool base at intervals. The filling supporting unit comprises a connecting base, a supporting sleeve and a supporting top cover. Before filling, the supporting sleeve of the filling type supporting tool is of a hollow structure, the weight is light, and carrying and laying in a goaf are convenient. After the filling type supporting tool is arranged in place, the filler is injected into the filling type supporting tool, and the supporting sleeve is filled with the filler, so that the filling sleeve is of a solid structure, the structural strength of the supporting sleeve is greatly improved, the supporting effect on a rock stratum above a goaf is improved, collapse of an overlying rock stratum can be effectively restrained, and the supporting effect of the goaf is improved. The surface collapse is effectively inhibited, the development depth of a fracture development zone is effectively inhibited, and a water retention effect is also achieved.

Description

Technical Field

[0001] The invention relates to the technical field of goaf support, and in particular to a filling support tool for goaf and a goaf filling support method. Background Art

[0002] Goafs are formed in the process of coal mining. In order to reduce the collapse of rock strata and ground surface above the goafs, the existing technology adopts goaf filling, support and other methods to support the rock strata above the goafs.

[0003] For example, Chinese invention patent publication number CN112360549A discloses a filling device and a filling method, which uses a concrete strip filling method to fill the goaf. The disadvantage is that it needs to be filled in sections, and each time the concrete must be solidified before demoulding and stage filling can be carried out, which is inefficient.

[0004] For example, a Chinese invention patent with publication number CN114060069A discloses a method for pre-supporting goaf areas in shallow deep coal mines, which uses a tensioned support frame arranged behind a hydraulic support to support the rock layer above the goaf. The drawback is that the support effect of the tensioned support frame is limited, and the tensioned support frames need to be densely arranged. The support effect basically depends on the structural strength of the support rods. When the upper rock layer collapses, the support rods will be bent or folded to a large extent, and even the tensioned support frame will be crushed. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a filling-type support tooling for goaf and a filling-type support method for goaf, by injecting filler into the filled-type support tooling that has been deployed in place, and using the filler to fill the support sleeve, so that the filling sleeve becomes a solid structure, the structural strength of the support sleeve is greatly improved, and the support effect on the rock strata above the goaf is enhanced, which can effectively inhibit the collapse of the overlying rock strata and effectively inhibit surface collapse.

[0006] The technical solution of the present invention provides a filling type support tool for goaf, comprising a tool base with a filling flow channel and a plurality of filling support units arranged at intervals on the tool 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; 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; Wherein, when the filling-type supporting tool is in use in the goaf, the supporting sleeve is filled with filling material.

[0007] In one of the optional technical solutions, 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; 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.

[0008] In one of the optional technical solutions, the lower end of the lifting sleeve has 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.

[0009] In one of the optional technical solutions, 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.

[0010] In one of the optional technical solutions, a plurality of the flow channel inlets are provided at intervals on the front end surface of the tooling base.

[0011] 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; 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.

[0012] 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.

[0013] 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.

[0014] In one of the optional technical solutions, the filler includes concrete, tailings sand, or a mixture of concrete and tailings sand.

[0015] 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; 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.

[0016] The above technical solution has the following beneficial effects: The filling type support tooling and the filling support method for the goaf provided by the present invention are such that before filling, the support sleeve of the filling type support tooling is a hollow structure, light in weight, and convenient for carrying and laying out in the goaf. After the filling type support tooling is laid out in place, fillers are injected into the filling type support tooling, and the support sleeves are filled with the fillers, so that the filling sleeves become a solid structure, which greatly improves the structural strength of the support sleeves, improves the support effect on the upper rock formations of the goaf, can effectively inhibit the collapse of the overlying rock formations, effectively inhibit surface collapse, effectively inhibit the development depth of the fracture development zone, and also plays a role in water retention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. 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 drawings: Figure 1A schematic diagram of a filling support tooling arranged in a goaf to support collapsed overlying rock strata in a goaf filling support method provided by an embodiment of the present invention; Figure 2 A schematic diagram of a method for filling and supporting a goaf provided in an embodiment of the present invention, in which filling equipment and filling pipelines are arranged in a tunnel, and a filling support tooling is arranged behind a hydraulic support; Figure 3 A three-dimensional diagram of a filling type support tooling provided in one embodiment of the present invention; Figure 4 for Figure 3 Section view along AA direction; Figure 5 This is a partial enlarged view of the flow channel outlet being located on the top surface of the tooling base; Figure 6 for Figure 5 Cross-sectional view along BB direction; Figure 7 A three-dimensional diagram of a filling and supporting unit provided in one embodiment of the present invention; Figure 8 A cross-sectional view of a filling and supporting unit provided in one embodiment of the present invention; Fig. 9 A cross-sectional view showing the connection between the lower end of the filling sleeve and the tooling base; Fig.10 is a cross-sectional view of the filling sleeve filled with filler; Fig.11 A three-dimensional diagram of a filling type support tooling provided by another embodiment of the present invention, wherein the lifting sleeve is in a lowered state; Fig.12 for Fig.11 A three-dimensional view of the filling type support tooling when the lifting sleeve is in a raised state; Fig.13 It is a cross-sectional view of the filling support unit when the lifting sleeve is in a descending state; Fig.14 A schematic diagram of a lower baffle plate provided at the lower end of the lifting sleeve; Fig.15 This is a schematic diagram of the installation of the telescopic pin; Fig.16 is a schematic diagram showing that the filling material first fills the lifting sleeve in the first stage of filling; Fig.17 is a schematic diagram showing that in the second stage of filling, the filling material lifts up the lifting sleeve and the fixed sleeve is also filled with the filling material; Fig.18 It is a schematic diagram showing that when the lifting sleeve is raised to the limit position, the lower baffle falls on the telescopic pin. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] like Figure 1-10 As shown, an embodiment of the present invention provides a filling support tool 9 for a goaf 7, comprising a tool base 91 having a filling flow channel 911 and a plurality of filling support units 92 arranged at intervals on the tool base 91.

[0020] The front end surface of the tooling base 91 is provided with a flow channel inlet 912 for connecting to the filling pipe 81 of the filling device 8 , and the top surface of the tooling base 91 is provided with a plurality of flow channel outlets 913 at intervals, and each flow channel outlet 913 is provided with a one-way valve 914 .

[0021] The filling support unit 92 includes a connecting seat 921 fixedly connected to the tooling base 91 , a supporting sleeve 922 connected to the connecting seat 921 and used to accommodate the filling material 10 , and a supporting top cover 923 connected to the upper end of the supporting sleeve 922 .

[0022] Each connection seat 921 has a connection seat through hole 9211 , and each connection seat through hole 9211 is correspondingly connected to a flow channel outlet 913 .

[0023] An exhaust passage 9231 communicating with the supporting sleeve 922 is provided in the supporting top cover 923 , and an exhaust port 9232 of the exhaust passage 9231 is provided on a side surface of the supporting top cover 923 .

[0024] When the filling type support tool 9 is in use in the goaf 7 , the support sleeve 922 is filled with the filling material 10 .

[0025] The filling type supporting tool 9 in use state referred to in the present invention means that the filling type supporting tool 9 can support the upper rock layer 2 after being filled with the filling material 10.

[0026] The filling type supporting tool 9 provided by the present invention is used in the goaf 7 to support the rock layer 2 above.

[0027] like Figure 1-2As shown, during coal mining, the coal mining face returns to the coal seam 1 along the arrow 2, and the hydraulic support 6 moves with the coal mining face, thereby forming a goaf 7 at the rear. The filling support tool 9 is transported to the rear of the hydraulic support 6 in advance, and then pushed to the designated position in the goaf 7 by equipment such as hydraulic cylinders. Filling equipment 8, such as grouting pumps, sand pumps, etc., are arranged in advance in the tunnels 5 on both sides or one side of the coal mining face to inject fillers 10 into the filling support tool 9 through the filling pipe 81. The filling 10 can be concrete, sand, tailings sand, etc., to improve the structural strength and support capacity of the filling support tool 9, inhibit the collapse of the upper rock layer 2, reduce the depth of the fracture development zone from the aquifer 3 downward, play a water retention role, and also reduce the collapse of the surface layer 4.

[0028] Specifically, the filling support tool 9 comprises a rectangular tool base 91 and a plurality of filling support units 92. The plurality of filling support units 92 are installed above the tool base 91 at intervals, and the plurality of filling support units 92 are preferably arranged in a matrix.

[0029] A filling channel 911 is provided in the tooling base 91, and a channel inlet 912 of the filling channel 911 is provided at the front end surface of the tooling base 91, and is used to connect with the filling pipe 81 of the filling device 8. A channel outlet 913 of the filling channel 911 is provided on the top surface of the tooling base 91. A plurality of channel outlets 913 are provided at intervals on the top surface of the tooling base 91, and the number of the channel outlets 913 is equal to the number of the filling support units 92, and each set of the filling support units 92 is connected to a corresponding channel outlet 913. Preferably, the plurality of channel outlets 913 are arranged in a matrix on the top surface of the tooling base 91.

[0030] A one-way valve 914 is provided in each flow channel outlet 913 , which only allows the filler 10 to flow into the filling support unit 92 and prevents the filler 10 from flowing out of the support sleeve 922 of the filling support unit 92 , so as to keep the filler 10 filling the support sleeve 922 .

[0031] 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.

[0032] Preferably, the connecting seat 921, the supporting sleeve 922 and the supporting top cover 923 are integrally arranged, and the structural strength is high.

[0033] Preferably, the connecting seat 921 adopts a rectangular bottom plate, the supporting sleeve 922 adopts a square tube, and the supporting top cover 923 adopts a rectangular cover plate, which is convenient for installation and positioning.

[0034] The connection seat 921 is fixedly connected to the tooling base 91, and the connection seat 921 has a connection seat through hole 9211 for the filler 10 to enter the support sleeve 922. Each connection seat 921 is connected to the area of ​​the tooling base 91 having the flow channel outlet 913, and each connection seat through hole 9211 is correspondingly connected to a flow channel outlet 913, and the filler 10 flowing out of the flow channel outlet 913 will enter the support sleeve 922 through the connection seat through hole 9211.

[0035] The support top cover 923 is arranged at the upper end of the support sleeve 922, closing the upper end of the support sleeve 922 and acting as a cap. The support top cover 923 is also used to support the rock layer 2, so 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 rock layer 2.

[0036] When filling the support sleeve 922, the gas in the support sleeve 922 needs to be discharged, otherwise the gas in the support sleeve 922 will prevent the filling material 10 from entering the support sleeve 922. In this way, an exhaust channel 9231 is provided in the support top cover 923, one end of the exhaust channel 9231 is opened on the bottom surface of the support top cover 923 or on the inner surface of the support sleeve 922, and the exhaust port 9232 of the exhaust channel 9231 is provided on the side of the support top cover 923, and the rock layer 2 above will not block the exhaust port 9232.

[0037] When the filling type support tooling 9 is arranged in the goaf 7, the support sleeve 922 is a hollow structure, light in weight, and convenient for carrying and arrangement in the goaf 7. After the filling type support tooling 9 is arranged in place, the filling material 10 is injected into the filling type support tooling 9, and the support sleeve 922 is filled with the filling material 10, so that the filling sleeve becomes a solid structure, which greatly improves the structural strength of the support sleeve 922, improves the support effect on the upper rock layer 2 of the goaf 7, can effectively suppress the collapse of the overlying rock layer 2, effectively suppress the surface collapse, effectively suppress the development depth of the fracture development zone, and also plays a role in water retention.

[0038] The height of the filling type support tooling 9 is slightly smaller than the height of the goaf 7. 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 layer 2 collapses, it will fall on the filling type support tooling 9 below, and the rock layer 2 will be supported by the support top cover 923. The solid support sleeve 922 acts as a pillar and will not be easily bent or broken, which can effectively suppress the collapse of the rock layer 2. In one embodiment, if Figure 11-13 and Figure 16-17As shown, the support sleeve 922 includes a fixed sleeve 9221 fixedly connected to the connecting 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.

[0039] The lifting sleeve 9222 can be lifted up by the filler 10 entering the supporting sleeve 922 so as to be in a raised state.

[0040] When the filling type supporting tooling 9 is in the initial state, the lifting sleeve 9222 is in the descending state.

[0041] When the filling type supporting tooling 9 is in use, the lifting sleeve 9222 is in a raised state.

[0042] In this embodiment, the support sleeve 922 adopts a lifting structure. When not filled, the support sleeve 922 is in a retracted state with a low height, which is convenient for transportation underground. When filled, the support sleeve 922 is lifted by the filler 10 to support the rock formation 2.

[0043] 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 in the fixed sleeve 9221. 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.

[0044] When the filler 10 enters the lifting sleeve 9222 at a relatively high flow rate and is blocked by the supporting top cover 923, the impact force of the filler 10 will lift the lifting sleeve 9222, putting it in a raised state.

[0045] When the filling-type supporting tool 9 is in the initial state, the lifting sleeve 9222 is in the descending state. At this time, the height of the whole set of filling-type supporting tool 9 is small, which is convenient for transportation underground.

[0046] When the filling type support tooling 9 is in use, the lifting sleeve 9222 is in a raised state, and the support top cover 923 is in a higher position to support the rock layer 2. Due to the effect of the one-way valve 914, the filling material 10 remains in the support sleeve 922 and does not flow out, so the lifting sleeve 9222 can remain in a raised state.

[0047] Another advantage of using the lifting sleeve 9222 is that when the rock layer 2 collapses and presses on the support top cover 923, the pressure will cause the lifting sleeve 9222 to tend to move downward. If the filler 10 used in the support sleeve 922 is sand, tailings sand, etc., it will be compacted and there will not be a large amount of displacement. The lifting sleeve 9222 will drive the support top cover 923 to move slightly downward adaptively, play a certain buffering role, and further reduce the risk of the support sleeve 922 being crushed.

[0048] In one embodiment, if Figure 13-18 As shown, the lower end of the lifting sleeve 9222 has a lower baffle 9222a, the upper end of the fixed sleeve 9221 is provided with an upper baffle 9221a for stopping the lower baffle 9222a from rising, and a telescopic pin 9221b is provided on the wall of the fixed sleeve 9221 below the upper baffle 9221a for preventing the lower baffle 9222a from falling.

[0049] When the lifting sleeve 9222 is in a descending state, the lower baffle 9222a falls on the connecting seat 921 , and the connecting seat through hole 9211 is located in the lower end of the lifting sleeve 9222 .

[0050] When the lifting sleeve 9222 is raised to the limit position, the lower baffle 9222a falls on the telescopic pin 9221b.

[0051] In this embodiment, a lower baffle 9222a is set at the lower end of the lifting sleeve 9222, an upper baffle 9221a is set at the upper end of the fixed sleeve 9221, and a telescopic pin 9221b is set on the wall of the fixed sleeve 9221 to limit the lifting position of the lifting sleeve 9222.

[0052] The lower baffle 9222a is annular and is disposed on the outer circumferential surface of the lower end of the lifting sleeve 9222. The upper baffle 9221a is annular and is disposed on the inner surface of the upper end of the fixed sleeve 9221. The telescopic pin 9221b is retracted by a spring and is disposed on the wall of the fixed sleeve 9221 and 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.

[0053] A plurality of telescopic pins 9221b may be provided along the circumferential direction on the wall of the fixed sleeve 9221. The end surface of the telescopic pin 9221b is a telescopic pin inclined surface 9221c, and the telescopic pin inclined surface 9221c gradually inclines upward in the direction from the wall of the fixed sleeve 9221 to the central axis.

[0054] The end surface of the lower baffle 9222a is a lower baffle inclined surface 9222b, and its inclination is consistent with the telescopic pin inclined surface 9221c.

[0055] When the lifting sleeve 9222 is lifted by the filler 10, the lower baffle 9222a rises together, and the telescopic pin 9221c is forced to shrink by the action of the lower baffle inclined surface 9222b on the telescopic pin inclined surface 9221c. When the lower baffle 9222a reaches above the telescopic pin 9221b, the telescopic pin 9221b extends out, thereby limiting the falling of the lower baffle 9222a.

[0056] In one embodiment, if Figure 4 As shown, the filling channel 911 is in a grid shape, and includes a plurality of channel intersections 9111 . Each channel outlet 913 is disposed at a channel intersection 9111 .

[0057] In this embodiment, the filling channel 911 is in a grid shape, which includes a plurality of transverse channels and a plurality of longitudinal channels. The longitudinal channels extend along the front-to-back direction or the length direction of the tooling base 91, and the transverse channels extend along the left-right direction or the width direction of the tooling base 91. The channel inlet 912 is arranged at the front end of the longitudinal channel, each longitudinal channel intersects with a plurality of transverse channels respectively, each transverse channel intersects with a plurality of longitudinal channels respectively, and the intersection of the transverse channel and the longitudinal channel is a channel intersection 9111. A channel outlet 913 is arranged at each channel intersection 9111. The filler 10 can reach each channel intersection 9111 through the transverse channel and the longitudinal channel, and then enter the support sleeve 922 through the channel outlet 913, thereby improving the filling speed.

[0058] In one embodiment, if Figure 3-4 and Figure 11-12 As shown, a plurality of flow channel inlets 912 are provided at intervals on the front end surface of the tooling base 91. During filling, each flow channel inlet 912 is connected to a filling pipe 81, and the filling speed is fast.

[0059] In one embodiment, if Figure 5-9 As shown, a plurality of top surface grooves are provided at intervals on the top surface of the tooling base 91 , each flow channel outlet 913 is located in a top surface groove, and an annular mounting groove 915 is formed between the groove wall of the top surface groove and the flow channel outlet 913 .

[0060] The connecting seat 921 is installed in the annular installation groove 915 through the locking piece 916 , and the flow channel outlet 913 is inserted into 922 through the connecting seat through hole 9211 .

[0061] In this embodiment, a top surface groove is provided on the top surface of the tooling base 91 in the area where the flow channel outlet 913 is provided, the tube wall of the flow channel outlet 913 extends into the top surface groove, and an annular mounting groove 915 is formed between the tube wall of the flow channel outlet 913 and the groove wall of the top surface groove. During assembly, the connecting seat 921 is placed in the annular mounting groove 915, and the flow channel outlet 913 is inserted into the support sleeve 922 through the connecting seat through hole 9211, so that the filler 10 can be directly output into the support sleeve 922. An internal threaded hole is provided at the bottom of the annular mounting groove 915, and a connecting through hole is provided on the connecting seat 921. A locking member 916, such as a bolt, passes through the connecting through hole on the connecting seat 921 and is connected in the internal threaded hole, thereby fastening the connecting seat 921 to the tooling base 91.

[0062] In one embodiment, if Figure 8 As shown, a connecting channel 9223 is provided in the upper end wall of the support sleeve 922, one end opening of the connecting channel 9223 is provided on the inner surface of the upper end wall, and the other end opening of the connecting channel 9223 is provided on the top surface of the upper end wall and is connected with the exhaust channel 9231.

[0063] 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.

[0064] 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.

[0065] In one embodiment, if Figure 3 and Figure 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 the adjacent support sleeves 922 are connected to each other, thereby improving the structural strength and being able to better support the rock layer 2.

[0066] In one embodiment, the filling material 10 includes concrete, tailings sand, or a mixture of concrete and tailings sand.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Tailings sand can be filled as sand, mixed with concrete, or mixed with water, gelling agent and other materials.

[0071] like Figure 1-2 As shown, a method for filling and supporting a goaf provided by an embodiment of the present invention adopts the filling and supporting tooling 9 of any of the aforementioned embodiments.

[0072] The goaf filling support method includes the following steps: S01: Arrange the filling equipment 8 and the filling pipeline 81 in the tunnel 5 in advance.

[0073] S02: The filling type supporting tooling 9 is transported sequentially to the rear of the hydraulic support 6 of the coal mining working face.

[0074] S03: As the coal mining face advances, the filling type support tooling 9 is arranged at intervals behind the hydraulic support, and the filling pipeline 81 is connected to the flow channel inlet 912 of the arranged filling type support tooling 9.

[0075] S04: Use the filling device 8 to inject the filling material 10 into the filling type support tooling 9, and use the filling material 10 to fill the support sleeve 922.

[0076] S05: After the supporting sleeve 922 is filled with the filling material 10, the filling pipe 81 connected to the flow channel inlet 912 is removed to carry out the next cycle of operation.

[0077] The operation of the next cycle refers to the coal mining face moving forward, the filling equipment 8 moving forward, the hydraulic support 6 moving forward, and the preparation of the filling support tooling 9 behind the hydraulic support 6.

[0078] In the method for filling and supporting the goaf provided by the present invention, before filling, the support sleeve 922 of the filling support tool 9 is a hollow structure, light in weight, and convenient for carrying and laying in the goaf 7. After the filling support tool 9 is laid in place, the filling material 10 is injected into the filling support tool 9, and the support sleeve 922 is filled with the filling material 10, so that the filling sleeve becomes a solid structure, which greatly improves the structural strength of the support sleeve 922, improves the support effect on the upper rock layer 2 of the goaf 7, can effectively inhibit the collapse of the overlying rock layer 2, effectively inhibit the collapse of the surface, effectively inhibit the development depth of the fracture development zone, and also plays a role in water retention.

[0079] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0080] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, which should also be considered 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; 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; Wherein, when the filling-type supporting tool is in use in the goaf, the supporting sleeve is filled with filling material.

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 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.

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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