An air self-inflating balloon device for filling low goafs and its usage method

Abstract

The present invention relates to the technical field of underground mining safety, and provides a self-inflating airbag device for filling a low goaf and a using method thereof. It includes: an outer airbag and an inner airbag, the outer airbag surrounds and encloses the inner airbag, and the outer airbag contacts each side wall of the goaf; the exhaust hole, the air injection hole of the outer airbag and the grouting hole of the inner airbag are all arranged on the side close to the entrance of the goaf; the volume V3 of the goaf is equal to the volume V1 after the outer airbag is filled with gas and the volume V2 after the inner airbag is grouted; grout is injected into the inner airbag through the grouting hole, and the gas in the outer airbag is extruded and discharged outward through the exhaust hole. The beneficial effects are as follows: during the grouting process, the grouting speed into the inner airbag is equal to the exhaust speed of the outer airbag at this time, ensuring that the outer airbag always stably supports the goaf during the grouting process, avoiding potential safety hazards during the construction process, and improving the stability and safety of the support.

Description

Technical Field

[0001] The present invention relates to the technical field of underground mining safety, and particularly relates to a self-inflating airbag device for filling a low goaf and a using method thereof. Background Art

[0002] As a green, environmentally friendly and sustainable mining method, the filling mining method has been increasingly applied. However, the filling method is prone to slurry leakage. At present, filling retaining walls are commonly used at home and abroad to prevent slurry leakage accidents. At the same time, the filling retaining wall also bears the lateral static pressure applied before the filling material solidifies, which has relatively high requirements for the performance of the filling retaining wall. Among them, concrete filling retaining walls and brick-concrete structure filling walls are used more frequently. However, the traditional retaining wall has a large amount of masonry work, poor bending resistance, and is prone to local displacement, deformation, cracking and even collapse, which may lead to slurry leakage or leakage accidents. In addition, setting up a filling retaining wall requires some personnel to enter the goaf for a long time of construction operations, which has a high risk in the goaf with poor support environment where there is residual coal, seriously threatening the personal safety of construction personnel.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-inflating airbag device for filling a low goaf and a using method thereof to solve the technical problems existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a self-inflating airbag device for filling a low goaf, comprising: an outer airbag and an inner airbag, the outer airbag surrounds and encloses the inner airbag, and the outer airbag contacts each side wall of the goaf; the exhaust hole, injection hole of the outer airbag and the grouting hole of the inner airbag are all arranged on the side close to the entrance of the goaf; the volume V3 of the goaf is equal to the volume V1 of the outer airbag after being filled with gas and the volume V2 of the inner airbag after grouting is completed; grout is injected into the inner airbag through the grouting hole to squeeze and discharge the gas in the outer airbag through the exhaust hole.

[0006] In an optional embodiment, the exhaust hole of the outer airbag is arranged on the upper side close to the entrance of the goaf, the injection hole of the outer airbag is on the lower side close to the entrance of the goaf, and the grouting hole of the inner airbag is located between the exhaust hole and the injection hole.

[0007] In an optional embodiment, the injection hole of the outer airbag is connected to an automatic inflator.

[0008] In an optional embodiment, after the inner airbag is grouted, it is closely attached to the inner side of the outer airbag.

[0009] In an alternative embodiment, the material of the outer airbag is PVC or PU, and the strength performance of the material of the inner airbag is slightly lower than that of the material of the outer airbag.

[0010] In an alternative embodiment, the charging / discharging time t1 of the outer airbag = V1 / v1, where V1 is the volume of the outer airbag after inflation is completed, and v1 is the charging / discharging speed of the outer airbag.

[0011] In an alternative embodiment, the grouting time t2 of the inner airbag = V2 / v2, where V2 is the volume of the inner airbag after grouting is completed, and v2 is the grouting speed.

[0012] In an alternative embodiment, during the process of grouting the inner airbag, the exhaust hole is opened, and t1 = t2, v2 = v1.

[0013] In an alternative embodiment, the gob area includes a first residual coal gob area and a second residual coal gob area; after grouting is completed, the inner airbag is fully spread out, and the grout solidifies into a paste to support the filling areas of the first residual coal gob area and the second residual coal gob area.

[0014] On the other hand, an embodiment of the present invention also provides a method for using the self-inflating airbag device for filling a low gob area as described above, including the following steps:

[0015] S1: Install the automatic inflator at the gob area to be filled, and connect the air injection hole of the outer airbag;

[0016] S2: Turn on the automatic inflator and calculate the inflation time according to the volume V3 of the gob area;

[0017] S3: After inflation is completed, use the grouting equipment to grout into the inner airbag through the grouting hole;

[0018] S4: Open the exhaust hole during the grouting process, the exhaust speed of the outer airbag is equal to the grouting speed into the inner airbag, and calculated according to m 3 / s, the grout in the inner airbag gradually squeezes out the gas in the outer airbag until it is emptied;

[0019] S5: After the exhaust is completed, the self-inflating airbag device forms a cube in close contact with the roof and floor of the gob area. After a certain period of time, the grout solidifies into a paste to support the gob area.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) By setting up equipment such as an inner airbag, an outer airbag, and an automatic inflator, and cooperating with good grouting materials, the self-inflating airbag device can better fill the gob area with a harsh environment after construction, playing a good supporting role. Moreover, when constructing the self-inflating airbag device, only the two airbags need to be placed in the gob area, making the construction safer and more efficient, and solving the problem of slurry leakage in the traditional filling process.

[0022] (2) During the grouting process of the self-inflating airbag device, the grouting speed into the inner airbag is equal to the exhaust speed of the outer airbag at this time, ensuring that the outer airbag always stably supports the gob area during the grouting process, avoiding potential safety hazards during construction, improving the stability and safety of the support, and at the same time reducing the working time for personnel to enter the dangerous gob area for support or build airtight walls, greatly reducing the casualty situation and effectively protecting the lives of front-line construction workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the geological structure of residual coal provided in an embodiment of the present invention.

[0025] Figure 2 It is a schematic diagram of the internal structure of the self-inflating airbag device provided in an embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram of the inflation, grouting, and exhaust process of the self-inflating airbag device provided in an embodiment of the present invention.

[0027] Figure 4 It is a schematic diagram of the geological structure after filling the gob area with residual coal provided in an embodiment of the present invention.

[0028] Among them, the reference numerals are:

[0029] 1 - basic roof; 2 - immediate roof; 3 - first residual coal gob area; 4 - residual coal; 5 - floor; 6 - outer airbag; 7 - inner airbag; 8 - exhaust hole; 9 - grouting hole; 10 - air injection hole; 11 - self-inflating direction; 12 - grouting direction; 13 - exhaust direction; 14 - slurry; 15 - first residual coal gob filling area, 16 - second residual coal gob filling area, 17 - second residual coal gob area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly located on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientations or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positions shown in the drawings, and are only for the convenience of description and cannot be construed as a limitation to the technical solution of the present application. The terms "first" and "second" are only for the purpose of convenient description and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined. Embodiment

[0032] Please refer to the attached Figures 1-4 , the purpose of this embodiment is to provide a self-inflating airbag device for filling low goafs, including: an outer airbag 6 and an inner airbag 7. The outer airbag 6 surrounds and encloses the inner airbag 7. The inner airbag 7 is connected to the outer airbag 6 through a grouting hole 9. Grout is injected into the inner airbag 7 through the outer airbag 6. After connection, there is no gap between the inner airbag 7 and the outer airbag 6. The grouting hole 9 stitches the two together. When grouting, the grout 14 only enters the inner airbag 7 and cannot enter the outer airbag 6. After grouting and exhausting at other positions of the inner airbag 7, it closely adheres to the inner side of the outer airbag 6, and the outer airbag 6 contacts each side wall of the goaf. Among them, the material of the outer airbag 6 is PVC or PU. Such materials have the advantages of low price, good waterproofness, wear resistance and temperature resistance, and can ensure that no slurry leakage accident occurs due to being scratched by the lower floor and the upper coal seam during use. The material strength performance of the inner airbag 7 is slightly lower than that of the outer airbag 6. The inner airbag 7 only needs to ensure that it will not be scratched by the internal filling slurry during use, such as using rubber material.

[0033] This self-inflating airbag device is used for filling severe goafs in residual coal mining. Specifically, due to the immaturity of traditional mining processes and the imperfect support technology, a large number of high-risk residual coal goafs are generated during the mining process without timely support. Preferably, as shown in the attached Figure 1 , the goaf includes a first residual coal goaf 3 and a second residual coal goaf 4, and there are many residual coals 4 in the goaf. Under the combined action of the basic roof 1, the immediate roof 2 and the residual coal seam 4, the residual coal goaf 3 often collapses and subsides. Timely support is required during residual coal mining, and the above problems can be solved by using the method of filling the goaf.

[0034] In this embodiment, the exhaust hole 8, the air injection hole 10 of the outer airbag 6, and the grouting hole 9 of the inner airbag 7 are all arranged on the side close to the entrance of the goaf 3. The air injection hole 10 of the outer airbag 6 is connected to an automatic inflator. Refer to the appendix Figure 2 . The exhaust hole 8 of the outer airbag 6 is arranged on the upper side close to the entrance of the goaf, the air injection hole 10 of the outer airbag 6 is on the lower side close to the entrance of the goaf, and the grouting hole 9 of the inner airbag 7 is located between the exhaust hole 8 and the air injection hole 10, so as to facilitate inflation, grouting and exhaust, and can realize the function of exhausting air while grouting.

[0035] It should be noted that the volume V3 of the goaf is equal to the volume V1 of the outer airbag 6 after being filled with gas and the volume V2 of the inner airbag 7 after the grouting is completed. The approximate equality of the above volumes enables the slurry 14 to enter and fill the inner airbag 7 and then closely adhere to the inner side of the outer airbag 6, preventing the formation of air pockets and avoiding the situation where the filling body does not contact the roof in the goaf.

[0036] This device mainly grouts into the inner airbag 7 through the grouting hole 9 and squeezes out the gas in the outer airbag 6 through the exhaust hole 8. It is worth mentioning that the inflation / exhaust time t1 of the outer airbag 6 = V1 / v1, where V1 is the volume of the outer airbag 6 after inflation is completed, and v1 is the inflation / exhaust speed of the outer airbag 6. The grouting time t2 of the inner airbag 7 = V2 / v2, where V2 is the volume of the inner airbag 7 after the grouting is completed, and v2 is the grouting speed. During the process of grouting into the inner airbag 7, the exhaust hole 8 is opened, and t1 = t2, v2 = v1. As above, during the grouting process, the grouting speed into the inner airbag 7 is equal to the exhaust speed of the outer airbag 6 at this time, ensuring that the outer airbag 6 always stably supports the goaf during the grouting process, avoiding potential safety hazards during the construction process, improving the stability and safety of the support, reducing the casualty situation, and effectively protecting the lives of front-line construction workers. And the above grouting and exhaust method makes the outer airbag 6 always in close contact with the top of the goaf, avoiding the situation where the filling body does not contact the roof in the goaf and further improving the safety of the support.

[0037] In an alternative embodiment, to complete the whole process of grouting and filling in this embodiment, it is necessary to follow the appendix Figure 3 as shown in the self-inflation direction 11, the grouting direction 12 and the exhaust direction 13. After the grouting is completed, the inner airbag 7 is fully spread out, and the slurry 14 solidifies into a paste to support the first residual coal goaf filling area 15 and the second residual coal goaf filling area 16. The paste has the required compressive mechanical properties of the goaf 3. Embodiment

[0038] Please refer to the appendix Figures 1-4 . The purpose of this embodiment is to provide a method for using the self-inflating airbag device for filling a low goaf as described above, including the following steps:

[0039] S1: Install the automatic inflator at the gob area to be filled, and connect the air injection hole 10 of the outer airbag 6;

[0040] S2: Turn on the automatic inflator and calculate the inflation time according to the volume V3 of the gob area 3;

[0041] S3: After inflation, use the grouting equipment to grout into the inner airbag 7 through the grouting hole 9;

[0042] S4: Open the exhaust hole 8 during the grouting process. The exhaust speed of the outer airbag 6 is equal to the grouting speed into the inner airbag 7. Calculated at m 3 / s, the slurry in the inner airbag 7 gradually squeezes out the gas in the outer airbag 6 until it is emptied;

[0043] S5: After the exhaust is completed, the self-inflating airbag device forms a cube that is in close contact with the roof and floor of the gob area. After a certain period of time, the slurry 14 solidifies into a paste to support the gob area.

[0044] By setting up equipment such as the inner airbag 7, the outer airbag 6 and the automatic inflator, and cooperating with good grouting materials, the self-inflating airbag device can better fill the gob area with a harsh environment after construction, playing a good supporting role. Moreover, when constructing the self-inflating airbag device, only the two airbags need to be placed in the gob area, and the construction is safer and more efficient, solving the problem of slurry leakage in the traditional filling process.

[0045] Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for using a self-inflating airbag device for filling a low goaf, characterized in that, The device includes: an outer airbag (6) and an inner airbag (7). The outer airbag (6) surrounds and encloses the inner airbag (7), and the outer airbag (6) is in contact with each side wall of the gob area. The exhaust hole (8), the air injection hole (10) of the outer airbag (6) and the grouting hole (9) of the inner airbag (7) are all arranged on the side close to the entrance of the gob area. The volume V3 of the gob area is equal to the volume V1 of the outer airbag (6) when filled with gas and the volume V2 of the inner airbag (7) after grouting is completed. Grout is injected into the inner airbag (7) through the grouting hole (9) to squeeze the gas in the outer airbag (6) out through the exhaust hole (8). The exhaust hole (8) of the outer airbag (6) is arranged on the upper side close to the entrance of the gob area, the air injection hole (10) of the outer airbag (6) is on the lower side close to the entrance of the gob area, and the grouting hole (9) of the inner airbag (7) is located between the exhaust hole (8) and the air injection hole (10). The gob area includes a first residual coal gob area (3) and a second residual coal gob area (4). After grouting is completed, the inner airbag (7) is fully spread out, and the grout (14) solidifies into a paste to support the first residual coal gob filling area (15) and the second residual coal gob filling area (16). The usage method of this device is as follows: S1: Install the automatic inflator at the gob area to be filled and connect the air injection hole (10) of the outer airbag (6). S2: Turn on the automatic inflator and calculate the inflation time according to the volume V3 of the gob area. S3: After inflation is completed, use the grouting equipment to inject grout into the inner airbag (7) through the grouting hole (9). S4: Open the exhaust hole (8) during the grouting process. The exhaust speed of the outer airbag (6) is equal to the grouting speed into the inner airbag (7), calculated at m 3 / s. The slurry in the inner airbag (7) gradually squeezes out the gas in the outer airbag (6) until it is emptied; S5: After exhaust is completed, the self-inflating airbag device forms a cube in close contact with the roof and floor of the gob area. After a certain period of time, the grout (14) solidifies to form a paste to support the gob area.

2. The usage method according to claim 1, characterized in that, The air injection hole (10) of the outer airbag (6) is connected to an automatic inflator.

3. The usage method according to claim 1, characterized in that, After the inner airbag (7) is grouted, it fits tightly against the inner side of the outer airbag (6).

4. The usage method according to claim 1, characterized in that The material of the outer airbag (6) is PVC or PU, and the material strength performance of the inner airbag (7) is slightly lower than that of the outer airbag (6).

5. The method of use according to claim 1, characterized in that, The inflation / exhaust time t1 of the outer airbag (6) = V1 / v1, where V1 is the volume of the outer airbag (6) after inflation is completed, and v1 is the inflation / exhaust speed of the outer airbag (6).

6. The usage method according to claim 5, characterized in that, The grouting time t2 of the inner airbag (7) = V2 / v2, where V2 is the volume of the inner airbag (7) after grouting is completed, and v2 is the grouting speed.

7. The method of use according to claim 6, wherein During the process of injecting grout into the inner airbag (7), the exhaust hole (8) is opened, and t1 = t2, v2 = v1.

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