A long-step continuous filling fully mechanized mining method

Abstract

The present invention provides a long-step continuous filling comprehensive mining method, which relates to the field of coal mining and includes the following steps: dividing the comprehensive mining face into a plurality of sections of predetermined lengths, and installing at least two spaced-apart side flap supports in each section; installing a first steel formwork between two adjacent side flap supports in each section; and installing a second steel formwork at both ends of the comprehensive mining face. By reserving space between the side flap supports to install the first steel formwork, a discontinuous reinforced concrete wall is formed, thereby achieving the purpose of temporarily supporting the roof of the goaf; by constructing two lanes, a continuous reinforced concrete wall continuously distributed along the advancing direction of the comprehensive mining face is formed to retain a lane along the goaf; based on the discontinuous reinforced concrete wall in the goaf and the continuous reinforced concrete walls in the two lanes, a large filling space is created, thereby achieving long-step and continuous large-scale filling of the comprehensive mining face, achieving rapid advancement of the comprehensive mining and filling face, and improving the overall efficiency of the mine.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, in particular to a long-step continuous filling fully mechanized mining method. Background Art

[0002] The amount of coal pressure in my country's coal mines has reached more than 15 billion tons, of which buildings account for nearly 70%. With the increase in demand for coal resources, the problem of coal pressure in mining areas has gradually become prominent. Although the traditional fully mechanized mining and filling method can solve the problem of coal pressure, the traditional fully mechanized mining and filling method requires filling the goaf after the working face advances 1.6m-2.4m. The filling preparation time and filling time greatly exceed the coal mining time, resulting in a slow daily advancement speed of the fully mechanized mining working face, which seriously affects the advancement speed of the fully mechanized mining. Summary of the Invention

[0003] The present invention provides a long-step continuous filling fully mechanized mining method, which is used to solve the problems of long preparation time and long filling time in the existing fully mechanized mining and filling methods.

[0004] The present invention provides a long-step continuous filling fully mechanized mining method, comprising the following steps:

[0005] Divide the fully mechanized mining working face into a plurality of sections of predetermined lengths, and install at least two spaced-apart side flap supports in each section;

[0006] A first steel template connected to a scraper conveyor is installed between two adjacent side flap brackets in each section;

[0007] A second steel template connected to the scraper conveyor is installed behind the side flap brackets at both ends of the fully mechanized mining working face;

[0008] During the maintenance shift, the first steel formwork and the second steel formwork are filled respectively, so that discontinuous reinforced concrete walls distributed at intervals along the advancing direction of the fully mechanized mining working face are formed by the first steel formwork, and continuous reinforced concrete walls distributed continuously along the advancing direction of the fully mechanized mining working face are formed by the second steel formwork;

[0009] When the fully mechanized mining working face advances forward a predetermined distance, the two reserved lanes of the fully mechanized mining working face are used to continuously fill the goaf with paste.

[0010] According to a long-step continuous filling fully mechanized mining method provided by the present invention, before executing the step of continuously filling the goaf with paste using the two reserved lanes of the fully mechanized mining working face, the following steps are further performed:

[0011] The goaf behind the side flip plate support is isolated.

[0012] According to the long-step continuous filling fully mechanized mining method provided by the present invention, the predetermined length is 30m-50m.

[0013] According to a long-step continuous filling comprehensive mining method provided by the present invention, the distance between two adjacent side flap supports in each section is 2m-4m.

[0014] According to a long-step continuous filling comprehensive mining method provided by the present invention, two adjacent side flap supports are connected by a connecting piece.

[0015] According to the long-step continuous filling fully mechanized mining method provided by the present invention, the connecting piece is an oil cylinder.

[0016] According to a long-step continuous filling comprehensive mining method provided by the present invention, the first steel template and the second steel template are both detachable steel templates.

[0017] According to a long-step continuous filling comprehensive mining method provided by the present invention, the side flap of the side flap support is used to support the top plate between two adjacent side flap supports.

[0018] According to the long-step continuous filling fully mechanized mining method provided by the present invention, the predetermined distance is 20m-30m.

[0019] According to a long-pitch continuous filling comprehensive mining method provided by the present invention, the first steel template and the second steel template are both connected to the scraper conveyor through a drag jack.

[0020] The long-step continuous filling comprehensive mining method provided by the present invention installs a first steel formwork by reserving space between the side flap supports, and fills the first steel formwork with high-strength materials to form discontinuous reinforced concrete walls with intervals, thereby achieving the purpose of temporarily supporting the roof of the goaf; through construction in two lanes, continuous reinforced concrete walls continuously distributed along the advancement direction of the comprehensive mining working face are formed to retain lanes along the goaf; based on the discontinuous reinforced concrete walls in the goaf and the continuous reinforced concrete walls in the two lanes, a large filling space is created, thereby realizing long-step and continuous large-scale filling of the comprehensive mining working face, realizing rapid advancement of the comprehensive mining and filling working face, and improving the comprehensive efficiency of the mine. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1This is a flow chart of the long-step continuous filling fully mechanized mining method provided by the present invention;

[0023] Figure 2 This is one of the principle schematic diagrams of the fully mechanized mining face advancement process provided by the present invention;

[0024] Figure 3 It is a schematic diagram of the connection relationship between the first steel template, the scraper conveyor and the side flap bracket provided by the present invention;

[0025] Figure 4 This is the second schematic diagram of the principle of the fully mechanized mining face advancement process provided by the present invention;

[0026] Figure 5 This is a schematic diagram of the main structure of the detachable steel template provided by the present invention;

[0027] Figure 6 It is a side structural schematic diagram of the detachable steel template provided by the present invention.

[0028] Figure numerals: 10, coal; 11, fully mechanized mining working face; 20, side flap support; 21, support; 22, side flap; 30, first steel formwork; 31, base; 32, formwork; 40, second steel formwork; 50, discontinuous reinforced concrete wall; 60, continuous reinforced concrete wall; 70, paste filling pipeline; 80, paste; 90, scraper conveyor; 91, oil cylinder; 92, drag jack. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0034] The following combination Figures 1-6 The long-step continuous filling fully mechanized mining method of the present invention is described.

[0035] Figure 1 The flowchart of the long-step continuous filling fully mechanized mining method provided by the present invention is illustrated. Figure 2 One of the principle schematic diagrams of the fully mechanized mining face advancement process provided by the present invention is illustrated. Figure 3 The schematic diagram of the connection relationship between the first steel template provided by the present invention and the scraper conveyor and the side flap bracket is shown as follows: Figure 1 、 Figure 2 and Figure 3 As shown in FIG, the long-step continuous filling fully mechanized mining method includes the following steps:

[0036] Step 100: Divide the fully mechanized mining face 11 into a plurality of sections of predetermined lengths, and install at least two spaced-apart side flap supports 20 in each section;

[0037] like Figure 1 As shown, due to the varying lengths of the fully mechanized mining working faces 11, the number of sections divided into each fully mechanized mining working face 11 also varies. In this embodiment, the predetermined section length is 30m-50m, with 40m being preferred. In this embodiment, two side flap supports 20 are installed in each section. Of course, the number of side flap supports 20 installed in a section is not limited to two; a greater number of side flap supports 20 may be provided as needed. The number of side flap supports 20 is determined based on the specific length of the section and the volume occupied by the side flap supports 20.

[0038] The space between the two side flap brackets 20 is used to install the first steel formwork 30. The distance between two adjacent side flap brackets 20 in each section is 2m-4m, and the preferred option is 3m. Of course, the distance between two adjacent side flap brackets 20 is not limited to this, and is specifically determined according to the size of the first steel formwork 30.

[0039] Step 200 , installing a first steel template 30 connected to the scraper conveyor 90 between two adjacent side flap brackets 20 in each section;

[0040] like Figure 2 As shown, the first steel formwork 30 is used to construct discontinuous reinforced concrete walls 50 spaced apart along the advancing direction of the fully mechanized mining working face 11. The discontinuous reinforced concrete walls 50 are spaced apart along the advancing direction of the fully mechanized mining working face 11. Figure 2 They are arranged in intervals in the left and right directions.

[0041] The discontinuous reinforced concrete wall 50 has the following two functions. The first function is to temporarily support the roof of the goaf. Since the roof of the goaf is supported, the comprehensive mining working face 11 can be continuously advanced 20m-30m before continuous large-scale paste 80 filling, which reduces the number of fillings, saves filling time, and increases the production time of coal cutting 10. The second function is that the space between the discontinuous reinforced concrete wall 50 and the discontinuous reinforced concrete wall 50 serves as a filling channel for the paste 80. The first steel formwork 30 and the scraper conveyor 90 move forward with the comprehensive mining working face 11, realizing the rapid construction and constrained forming of the reinforced concrete wall, reducing the filling preparation time and filling time, and improving the advancement speed of the comprehensive mining working face 11.

[0042] In one embodiment of the present invention, Figure 3As shown, the side flap support 20 includes a support 21 and a side flap 22. The side flap 22 is arranged on the outer periphery of the top of the support 21 and is used to support the top plate. Two adjacent side flap supports 20 are connected by a connector, that is, the supports 21 of two adjacent side flap supports 20 are connected by a connector. In this embodiment, the connector is an oil cylinder 91, which connects the two adjacent supports 21 together, improves the stability of the side flap supports 20, prevents the support from falling, and enhances safety during construction. The side flap 22 of the side flap support 20 is used to support the top plate between the two adjacent side flap supports 20, providing a guarantee for the safe construction of the first steel formwork 30.

[0043] Step 300: Install the second steel template 40 connected to the scraper conveyor 90 behind the side flap supports 20 at both ends of the fully mechanized mining working face 11;

[0044] The second steel formwork 40 is used to form a continuous reinforced concrete wall 60 continuously distributed along the advancing direction of the fully mechanized mining working face 11. Figure 1 As shown, the continuous reinforced concrete wall 60 extends in a continuous horizontal direction. This wall is used for rapid gob-side entry retention, which provides space for the final filling of the paste 80. The two gob-side entry retention in the fully mechanized mining face 11 avoids waste of coal pillars in the two working face sections and increases the recovery rate of the coal 10.

[0045] Figure 5 The main structural diagram of the detachable steel template 32 provided by the present invention is illustrated. Figure 6 The side view of the detachable steel template 32 provided by the present invention is illustrated as follows: Figure 5 and Figure 6 As shown, in this embodiment, both the first steel formwork 30 and the second steel formwork 40 are detachable steel formwork 32. The detachable steel formwork 32 includes a base 31 and multiple formworks 32. The multiple formworks 32 are sequentially arranged on the upper portion of the base 31 along the vertical direction. Adjacent formworks 32 are connected by fasteners to achieve a detachable connection. The use of detachable steel formwork 32 can accelerate the construction of reinforced concrete walls and ensure the constrained formation of the concrete walls, thereby ensuring that the wall construction and coal mining processes 10 do not interfere with each other, further improving the advancement speed of the fully mechanized mining working face 11.

[0046] Step 400: During the maintenance shift, the first steel formwork 30 and the second steel formwork 40 are filled separately. The first steel formwork 30 forms discontinuous reinforced concrete walls 50 that are spaced apart along the advancing direction of the fully mechanized mining working face 11. The second steel formwork 40 forms a continuous reinforced concrete wall 60 that is continuously distributed along the advancing direction of the fully mechanized mining working face 11.

[0047] like Figure 3As shown, during production, the fully mechanized mining face 11 advances normally, and the second steel templates 40 connected to both ends and the second steel template 40 connected to the middle of the scraper conveyor 90 move forward normally along with the support 21. In this embodiment, the first steel template 30 and the second steel template 40 are both connected to the scraper conveyor 90 via a towing jack 92.

[0048] During the maintenance shift, since mining operations at the fully-mechanized mining face 11 are stopped, support operations can be carried out, which will not affect the advancement of the fully-mechanized mining face 11. During the support operations, the first steel formwork 30 and the second steel formwork 40 are filled separately. The first steel formwork 30 forms discontinuous reinforced concrete walls 50 that are spaced apart along the advancement direction of the fully-mechanized mining face 11, while the second steel formwork 40 forms a continuous reinforced concrete wall 60 that is continuously distributed along the advancement direction of the fully-mechanized mining face 11. The support effect of the discontinuous reinforced concrete walls 50 and the continuous reinforced concrete walls 60 ensures the stability of the goaf roof, allowing the fully-mechanized mining face 11 to continue to advance, thereby creating a large filling space.

[0049] like Figure 3 As shown, in order to improve the stability of the discontinuous reinforced concrete wall 50 and the continuous reinforced concrete wall 60, the bottom of the reinforced concrete wall is widened, that is, the width of the bottom of the reinforced concrete wall is greater than the width of the upper part of the reinforced concrete wall, so as to improve the stability of the reinforced concrete wall after being installed on the bottom plate, and further enhance the supporting effect of the reinforced concrete wall on the top plate.

[0050] Step 500: When the fully mechanized mining working face 11 advances a predetermined distance, the two reserved lanes of the fully mechanized mining working face 11 are used to continuously fill the goaf with paste 80.

[0051] Figure 4 The second schematic diagram of the principle of the advancement process of the fully mechanized mining working face 11 provided by the present invention is illustrated as follows: Figure 4 As shown, after the fully-mechanized mining face 11 advances a predetermined distance, filling can be performed. The filling operation and the advancement of the fully-mechanized mining face 11 do not affect each other, further improving the advancement speed of the fully-mechanized mining face 11. In this embodiment, the predetermined distance is 20m-30m, and the specific value of the predetermined distance is determined based on the support effectiveness of the discontinuous reinforced concrete wall 50 and the continuous reinforced concrete wall 60.

[0052] During the filling operation, paste 80 is injected into the goaf through a paste filling pipeline 70 installed in the lanes of the fully mechanized mining face 11, ensuring that the paste 80 completely fills the goaf. The combination of discontinuous reinforced concrete walls 50, continuous reinforced concrete walls 60, and the paste filling material between the walls creates a strong-weak filling complex, providing better support for the goaf roof, lowering costs, and accelerating construction. Compared to traditional fully mechanized mining and filling methods, the fully mechanized mining face 11 advances more than three times faster, achieving rapid advancement of the filling process.

[0053] In one embodiment of the present invention, before performing the step of continuously filling the goaf with paste 80 using the two reserved lanes of the fully mechanized mining working face 11, the following steps are further performed:

[0054] The goaf behind the side flap support 20 is isolated.

[0055] The long-step continuous filling comprehensive mining method provided by the present invention installs the first steel formwork 30 by reserving space between the side flap supports 20, and fills the first steel formwork 30 with high-strength material to form discontinuous reinforced concrete walls 50 with intervals, so as to achieve the purpose of temporarily supporting the roof of the goaf; by constructing in two lanes, continuous reinforced concrete walls 60 continuously distributed along the advancing direction of the comprehensive mining working face 11 are formed to retain lanes along the goaf; based on the discontinuous reinforced concrete walls in the goaf and the continuous reinforced concrete walls in the two lanes, a large filling space is created, thereby realizing long-step and continuous large-scale filling of the comprehensive mining working face, realizing rapid advancement of the comprehensive mining filling working face, and improving the comprehensive efficiency of the mine.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A long-step continuous filling fully mechanized mining method, characterized in that: The following steps are involved: Divide the fully mechanized mining working face into a plurality of sections of predetermined lengths, and install at least two spaced-apart side flap supports in each section; A first steel template connected to a scraper conveyor is installed between two adjacent side flap brackets in each section; A second steel template connected to the scraper conveyor is installed behind the side flap brackets at both ends of the fully mechanized mining working face; During the maintenance shift, the first steel formwork and the second steel formwork are filled respectively, so that discontinuous reinforced concrete walls distributed at intervals along the advancing direction of the fully mechanized mining working face are formed by the first steel formwork, and continuous reinforced concrete walls distributed continuously along the advancing direction of the fully mechanized mining working face are formed by the second steel formwork; When the fully mechanized mining working face advances forward a predetermined distance, the two reserved lanes of the fully mechanized mining working face are used to continuously fill the goaf with paste.

2. The long-step continuous filling fully mechanized mining method according to claim 1 is characterized in that: Before executing the step of continuously filling the goaf with paste using the two reserved lanes of the fully mechanized mining working face, the following steps are further executed: The goaf behind the side flip plate support is isolated.

3. The long-step continuous filling fully mechanized mining method according to claim 1 is characterized in that: The predetermined length is 30m-50m.

4. The long-step continuous filling fully mechanized mining method according to claim 1 is characterized in that: The distance between two adjacent side flap brackets in each section is 2m-4m.

5. The long-step continuous filling fully mechanized mining method according to any one of claims 1 to 4, characterized in that: Two adjacent side flap brackets are connected via a connecting piece.

6. The long-step continuous filling fully mechanized mining method according to claim 5, characterized in that: The connecting piece is an oil cylinder.

7. The long-step continuous filling fully mechanized mining method according to any one of claims 1 to 4, characterized in that: The first steel template and the second steel template are both detachable steel templates.

8. The long-step continuous filling fully mechanized mining method according to any one of claims 1 to 4, characterized in that: The side flap of the side flap bracket is used to support the top plate between two adjacent side flap brackets.

9. The long-step continuous filling fully mechanized mining method according to any one of claims 1 to 4, characterized in that: The predetermined distance is 20m-30m.

10. The long-step continuous filling fully mechanized mining method according to any one of claims 1 to 4, characterized in that: The first steel template and the second steel template are both connected to the scraper conveyor through a drag jack.

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