Supporting stack construction device and method for filling and mining

Abstract

The invention discloses a supporting stack construction device for filling and mining. The supporting stack construction device comprises a filling slurry conveying pipe, a sleeve cutting pipe, a bag storage pipe and a guide head. The filling slurry conveying pipe comprises an outer pipe and an inner pipe which are coaxially arranged in a sleeved mode, a main slurry conveying channel is arranged in the inner pipe, and an auxiliary slurry conveying channel is arranged between the outer pipe and the inner pipe. A first mixed slurry conveying channel is arranged in the sleeve cutting pipe; a second mixed slurry conveying channel is arranged in the bag storage pipe; the bag storage tube is provided with a bag, and a bag opening of the bag is connected with the cannula cutting tube; main filling slurry fed through the main slurry conveying channel and auxiliary filling slurry fed through the auxiliary slurry conveying channel enter the first mixed slurry conveying channel and then are mixed to obtain mixed slurry, and the mixed slurry enters the second mixed slurry conveying channel and then can conduct grouting filling on a bag. By means of the structural design, the horizontal long drill hole is used for releasing the bag, and the stable supporting device for the goaf is simple in structure and convenient to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining, and in particular relates to a supporting pile construction device and a construction method for filling mining. Background Art

[0002] The subsidence of overburden in the goaf caused by coal mining will bring about problems such as damage to water resources, land and ground structures. At the same time, the goaf formed will also cause safety problems such as water accumulation and fire. The key to solving the above problems lies in how to control the subsidence of the overburden in the goaf, and how to reduce or avoid leaving goaf space. In recent years, underground columnar and strip filling mining methods have been developed on the basis of paste filling mining. The principle is to use bags, isolation plates, etc. to fill underground to form an interval paste support body to reduce the filling amount, thereby shortening the filling time of the filling slurry and improving the filling mining efficiency. However, its essence is to use the conveying pipeline arranged in the underground tunnel to inject the filling slurry into the bag or the interval isolation space behind the hydraulic support to form a support body. The filling operation can only be carried out after the coal mining operation is stopped. The problem of low filling efficiency and low coal mining capacity caused by the need to alternate coal mining and filling operations has not been solved. Therefore, the existing filling method is only suitable for small and medium-sized coal mines with an annual output of hundreds of thousands of tons to nearly one million tons, and is not suitable for large-scale high-yield and high-efficiency coal mines with an annual output of more than one million tons. In view of the above problems, there is an urgent need for a filling mining device and method that can reduce or avoid the impact on coal mining operations and cause low efficiency of coal mining operations. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a support pile construction device and construction method for filling mining, so as to solve the technical problem existing in the prior art that the filling operation and the coal mining operation cannot be carried out synchronously, resulting in low efficiency of the coal mining operation.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0005] A supporting pile construction device for filling and excavation, comprising a filling slurry conveying pipe, a casing cutting pipe, a bag storage pipe and a guide head which are coaxially connected and arranged in sequence from back to front; the filling slurry conveying pipe comprises an outer pipe and an inner pipe which are coaxially sleeved, a main slurry conveying channel is arranged in the inner pipe, and an auxiliary slurry conveying channel is arranged between the outer pipe and the inner pipe;

[0006] A first mixed slurry conveying channel is provided in the casing cutting pipe;

[0007] A second mixed slurry conveying channel is provided in the bag storage tube; the bag storage tube is provided with a bag, and the bag mouth of the bag is connected to the casing cutting tube;

[0008] The main filling slurry fed through the main slurry conveying channel and the auxiliary filling slurry fed through the auxiliary slurry conveying channel enter the first mixed slurry conveying channel and are mixed to obtain a mixed slurry. The mixed slurry enters the second mixed slurry conveying pipeline and can be used for grouting and filling the bag.

[0009] The present invention also has the following technical features:

[0010] Specifically, a first high-pressure water delivery channel is axially penetrated through the wall of the outer tube.

[0011] Furthermore, the casing cutting tube comprises a casing cutting tube body and a fixed base which are coaxially connected from back to front, an annular mounting groove is formed at the connection between the casing cutting tube body and the fixed base, and a rotating cutting head is arranged in the annular mounting groove;

[0012] A second high-pressure water delivery channel is axially penetrated through the wall of the casing cutting tube body and can be coaxially connected to the first high-pressure water delivery channel. The second high-pressure water delivery channel can also be connected to a deflected high-pressure water jet channel obliquely opened in the rotating cutting head. The deflected high-pressure water jet channel is connected to a jet outlet opened on the outer wall of the rotating cutting head. The rotating cutting head can rotate under the drive of the high-pressure water flow, and the high-pressure water flow ejected through the jet outlet can cut the casing coaxially sleeved outside the casing cutting tube.

[0013] Furthermore, the bladder bag storage tube includes an outer tube and an inner tube, a storage tube, a storage space is formed between the outer tube and the inner tube, and a bladder bag storage tube is provided in the storage space; the rear end of the outer tube is connected to the rear end of the inner tube via a connecting plate, the bladder bag is mounted on the outside of the inner tube, and the bag mouth passes through an annular opening on the connecting plate and is connected to the fixed base.

[0014] Furthermore, the casing cutting pipe is connected to the filling slurry delivery pipe through a connector, and a third high-pressure water delivery channel is axially opened in the connector, and the third high-pressure water delivery channel can be coaxially connected with the first high-pressure water delivery channel and the second high-pressure water delivery channel.

[0015] Furthermore, the front end surface of the sleeve cutting tube body is concave to form an annular water passage cavity, and the annular water passage cavity is respectively connected to the second high-pressure water delivery channel and the deflected high-pressure water jet channel.

[0016] Furthermore, the rotary cutting head is connected to the casing cutting tube body through a bearing.

[0017] The present invention also provides a method for constructing a supporting pile for filling and opening, which is implemented by the above-mentioned supporting pile construction device for filling and opening, and includes the following steps:

[0018] Step 1: In the coal seam roof rock layer, a plurality of horizontal long boreholes are arranged along the length direction of the working face, and casing cementing is adopted, wherein the plurality of horizontal long boreholes are arranged at intervals along the width direction of the working face;

[0019] Step 2: inserting a support pile construction device for filling and opening into the long horizontal borehole of the roof, and conveying the guide head to the end of the long horizontal borehole of the roof;

[0020] Step 3: Use the casing cutting tube to spray high-pressure water to cut off the casing to form a bag delivery channel;

[0021] Step 4, filling the main filling slurry through the main slurry conveying channel, filling the auxiliary filling slurry through the auxiliary slurry conveying channel, the main filling slurry and the auxiliary filling slurry enter the first mixed slurry conveying channel and mix to obtain a mixed slurry; after the mixed slurry enters the second mixed slurry conveying pipeline, the bag is grout-filled and pushed into the goaf; the bag is filled with the mixed slurry to construct a support pile for filling and mining;

[0022] Step 5: lift the filling opening support stack construction device to the orifice; install the bladder bag;

[0023] Step 6: lower the filling and opening support pile construction device into the horizontal long borehole of the roof to the next filling position;

[0024] Step 7, repeat steps 3 to 6 until the construction of the filling opening support stacks at all filling positions is completed, and a plurality of filling opening support stacks spaced apart along the length direction of the working belt are obtained.

[0025] Furthermore, the main filling material includes a paste filling slurry made of coal gangue, fly ash, aeolian sand, cement, etc., and the auxiliary filling material is a liquid quick-setting agent.

[0026] Furthermore, the layout interval of the edges of adjacent support piles along the length direction of the working surface is 5 to 15 m; the layout interval of the edges of adjacent support piles along the width direction of the working surface is 0 to 15 m.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The device of the present invention is arranged in a drill hole in the roof rock layer of the coal seam. Through structural design, coaxially connected device components are used to pump filling slurry into the bag. After the bag falls into the working surface, it can eventually form a relatively stable support pile, thereby achieving stable support for the roof rock layer above the goaf formed during the mining process; the casing is cut with the help of a casing cutting tube to construct a bag delivery channel. The device has a simple structure and is easy to operate.

[0029] (2) The supporting pile construction method for filling and mining proposed in the present invention can support the roof as the coal mining is in progress. There is no need to completely stop the coal mining operation, and there is no need to wait for the roof to collapse or transport supporting materials. There is no need to disassemble and assemble the filling support, which saves construction time and avoids the filling operation affecting the progress of the coal mining operation, thereby improving mining efficiency.

[0030] (3) The backfilling excavation proposed in the present invention adopts a support pile construction method, which eliminates the need to lay out and install backfill slurry delivery pipelines in the underground tunnel space, thereby reducing the complexity of equipment in the limited space of the underground tunnel.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0033] Figure 2 It is a cross-sectional view of the filling slurry delivery pipe;

[0034] Figure 3 It is a schematic diagram of the casing cutting pipe structure;

[0035] Figure 4 It is a schematic diagram of the local structure of the casing cutting pipe;

[0036] Figure 5 It is a cross-sectional view of the bladder storage tube;

[0037] Figure 6 It is a schematic plan view of constructing a support pile by using directional long drilling in Example 2;

[0038] Figure 7 Top view of the support pile constructed by directional long drilling in Example 2

[0039] Figure 8 is a schematic diagram of the capsule filling process;

[0040] Fig. 9 2 is a cross-sectional view of a support stack formed in Example 2.

[0041] The symbols in the figure represent:

[0042] 1-filling slurry delivery pipe, 2-casing cutting pipe, 3-bladder bag storage pipe, 4-guide head, 5-bladder bag, 6-handle, 7-support pile, 8-mixed slurry, 9-casing; 11-outer tube, 12-inner tube, 13-main slurry delivery channel, 14-auxiliary slurry delivery channel, 15-first high-pressure water delivery channel; 21-first mixed slurry delivery channel, 22-casing cutting pipe body, 23-fixed base, 24-rotating cutting head, 25-second high-pressure water delivery channel, 26-bearing; 31-second mixed slurry delivery channel, 32-bladder bag storage pipe outer tube, 33-bladder bag storage pipe inner tube, 34-connecting plate; 61-third high-pressure water delivery channel; 221-water passage cavity; 241-biased high-pressure water jet channel.

[0043] The specific contents of the present invention are further explained in detail below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0044] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0045] The terms "upper", "lower", "front", "back", "top", "bottom" and the like used in the present invention to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction. "Inside" and "outside" refer to the inside and outside of the contours of the corresponding components, and the above terms cannot be understood as limiting the present invention. The terms "front" and "back" used in this solution are as follows: Figure 2 shown.

[0046] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0047] In the present invention, unless otherwise stated, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0048] The following is an explanation of the technical terms involved in this new application:

[0049] Filling working face: The place underground that is mainly engaged in production processes such as roof support in the working area, support of the space to be filled in the goaf, transportation of filling materials, and filling in the goaf. It usually advances forward closely following the coal mining working face.

[0050] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art. For example, the columns in the present invention can be existing hydraulic props.

[0051] Example 1

[0052] Following the above technical solution, Figures 1 to 5 As shown, the present invention discloses a device for constructing a supporting pile for filling and opening, comprising a filling slurry conveying pipe 1, a casing cutting pipe 2, a bag storage pipe 3 and a guide head 4 which are coaxially connected and arranged in sequence from back to front; the filling slurry conveying pipe 1 comprises an outer pipe 11 and an inner pipe 12 which are coaxially sleeved, a main slurry conveying channel 13 is arranged in the inner pipe 12, the main slurry conveying channel 13 is used to convey the main slurry for filling, an auxiliary slurry conveying channel 14 is arranged between the outer pipe 11 and the inner pipe 12, the auxiliary slurry conveying channel 14 is used to convey quick-setting material as auxiliary slurry; wherein, the casing cutting pipe 2 is used to cut the casing, the casing is sleeved outside the device for constructing a supporting pile for filling and the casing 9 functions to fix the hole.

[0053] A first mixed slurry conveying channel 21 is provided in the casing cutting tube 2; a second mixed slurry conveying channel 31 is provided in the bag storage tube 3; a bag 5 is provided in the bag storage tube 3, and the bag mouth of the bag 5 is connected to the casing cutting tube 2; the main filling slurry fed through the main slurry conveying channel 13 and the auxiliary filling slurry fed through the auxiliary slurry conveying channel 14 enter the first mixed slurry conveying channel 21 and are mixed to obtain a mixed slurry 8, and the mixed slurry 8 can be grouted and filled in the bag 5 after entering the second mixed slurry conveying pipeline 31.

[0054] As a preferred solution of this embodiment, Figure 2 As shown, a first high-pressure water delivery channel 15 is axially provided on the wall of the outer tube 11. The first high-pressure water delivery channel 15 is communicated with a high-pressure water delivery pipe provided on the ground for delivering high-pressure water for casing cutting.

[0055] As a preferred solution of this embodiment, Figure 3 and Figure 4As shown, the casing cutting tube 2 includes a casing cutting tube body 22 and a fixed base 23 which are coaxially connected from back to front. An annular mounting groove is formed at the connection between the casing cutting tube body 22 and the fixed base 23 along the circumference of the casing cutting tube 2. A rotating cutting head 24 is arranged in the annular mounting groove. The rotating cutting head 24 can cut the casing with the help of a jet of high-pressure water. A second high-pressure water delivery channel 25 is axially penetrated on the wall of the casing cutting tube body 22 and can be coaxially connected to the first high-pressure water delivery channel 15. The second high-pressure water delivery channel 25 can also be connected to a deflected high-pressure water jet channel 241 obliquely opened in the rotating cutting head 24. The deflected high-pressure water jet channel 241 is connected to a jet outlet opened on the outer wall of the rotating cutting head 24. The first high-pressure water delivery channel 15, the second high-pressure water delivery channel 25 and the deflected high-pressure water jet channel 241 are connected to form a high-pressure water flow channel; the deflection force generated by the high-pressure water passing through the deflected high-pressure water jet channel is used to drive the rotating cutting head 24 to rotate around the casing cutting tube body 22, and the high-pressure water flow ejected through the jet outlet can cut the casing 9 coaxially sleeved outside the casing cutting tube 2.

[0056] As a preferred solution of this embodiment, Figure 5 As shown, the bag storage tube 3 includes a bag storage tube outer tube 32 and a bag storage tube inner tube 33, and a storage space is formed between the bag storage tube outer tube 32 and the bag storage tube inner tube 33, and a bag 5 is arranged in the storage space; the rear end of the bag storage tube outer tube 32 is connected to the rear end of the bag storage tube inner tube 33 via a connecting plate 34, the bag 5 is sleeved on the outside of the bag storage tube inner tube 33, and the bag mouth of the bag 5 passes through the annular opening on the connecting plate 34 and is connected to the fixed base 23, the bag mouth of the bag 5 can be fixed to the fixed base 23 by means of a tightening ring, and the bag 5 can also cooperate with the fixed base 23 by means of the bag storage tube outer tube 32, and be fixed by means of an elastic ring arranged on the bag mouth of the bag 5. When the bag 5 is filled with filling slurry, the bag 5 can be separated from the bag storage tube 3 under the action of gravity of the filling slurry when the filling opening support stack construction device is lifted up.

[0057] As a preferred solution of this embodiment, the casing cutting pipe 2 is connected to the filling slurry delivery pipe 1 through a connector 6, and a third high-pressure water delivery channel is axially opened in the connector 6. The third high-pressure water delivery channel can be coaxially connected with the first high-pressure water delivery channel 15 and the second high-pressure water delivery channel 25.

[0058] As a preferred solution of this embodiment, the front end surface of the sleeve cutting tube body 22 is concave to form an annular water passage cavity 221, which is connected to the second high-pressure water delivery channel 25 and the biased high-pressure water jet channel 241 respectively.

[0059] As a preferred solution of this embodiment, the rotary cutting head 24 is connected to the casing cutting tube body 22 via a bearing 26 .

[0060] The device of the present invention is used for being arranged in a directional long drill hole in the rock layer of the roof of a coal seam. The mixed slurry for filling is pumped into the bag by means of a coaxially connected filling slurry conveying pipe, a casing cutting pipe and a bag storage pipe. The bag falls into the goaf of the working face through a bag delivery channel under the action of gravity. After the mixed slurry solidifies, a relatively stable support pile can be formed, thereby realizing stable support for the goaf formed during the mining process. During the mining process, the casing can also be cut with the help of the provided casing cutting pipe to construct a bag delivery channel. The whole device has a simple structure and is easy to operate.

[0061] Example 2

[0062] This embodiment discloses a method for constructing a supporting stack for a filling opening, which is implemented by the device for constructing a supporting stack for a filling opening disclosed in Embodiment 1, and includes the following steps:

[0063] Step 1: Figure 7 As shown, in the coal seam roof rock layer, a plurality of horizontal long boreholes are arranged along the length direction of the working face, that is, the horizontal long boreholes extend along the length direction of the working face, each horizontal long borehole is cemented by means of a casing 9, and the plurality of horizontal long boreholes are arranged at intervals along the width direction of the working face;

[0064] Step 2: lower the filling and opening support pile construction device into the horizontal long drill hole of the roof, and transport the guide head 4 to the end of the horizontal long drill hole of the roof;

[0065] Step 3: Use the casing cutting pipe 2 to spray high-pressure water to cut the casing 9, so as to form a bag delivery channel connecting the directional long borehole and the goaf in the working face;

[0066] Step 4: Fill the main filling slurry through the main slurry conveying channel 13, and fill the auxiliary filling slurry through the auxiliary slurry conveying channel 14. The main filling slurry and the auxiliary filling slurry enter the first mixed slurry conveying channel 21 and are mixed to obtain a mixed slurry 8. After the mixed slurry 8 enters the second mixed slurry conveying pipeline 31, the sac bag 5 is grout-filled, and the sac bag 5 is pushed into the goaf through the guide head 4, and the sac bag 5 falls on the ground of the goaf; Figure 8 As shown, grouting is performed until the bag 5 is filled with the mixed slurry 8 to obtain a filling support stack 7;

[0067] Step 5, lift the filling opening support stack construction device to the orifice; reinstall the bag 5;

[0068] Step 6: lower the filling and opening support pile construction device into the horizontal long borehole of the roof to the next filling position;

[0069] Step 7, repeat steps 3 to 6 until the construction of the filling opening support stacks at all filling positions is completed, and a plurality of filling opening support stacks 7 are obtained, which are arranged at intervals along the length of the working belt.

[0070] Preferably, the main filling material includes coal gangue, fly ash, cement and water, and the auxiliary filling material is a liquid accelerating agent, which specifically includes sodium silicate, potassium silicate accelerating agent, aluminate accelerating agent and alkali-free liquid accelerating agent.

[0071] The main filling material is the paste filling material made of the above-mentioned coal gangue, fly ash, cement and water, which is an existing filling material. The auxiliary filling material serves to shorten the setting time of the filling material.

[0072] Furthermore, the spacing between the edges of adjacent support piles along the length direction of the working face is 8m; the spacing between the edges of adjacent support piles along the width direction of the working face is 5m. In actual construction, in order to strengthen the support, the goaf between the support piles 7 arranged at intervals along the length direction of the working face can be filled with paste slurry by means of ground drilling or underground directional drilling.

[0073] To sum up, compared with the existing technology, during the coal mining work, the roof support is carried out as the coal mining is carried out. There is no need to completely stop the coal mining operation, there is no need to wait for the roof to collapse or to transport supporting materials, and there is no need to disassemble and fill the support. This saves construction time, thereby avoiding the support operation affecting the progress of the coal mining operation and improving mining efficiency.

[0074] In the above description, unless otherwise clearly specified and limited, the terms "set", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a direct connection or an indirect connection, etc. For ordinary technicians in this field, the specific meanings of the above terms in this technical solution can be understood according to specific circumstances.

[0075] The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A device for constructing a supporting pile for filling and opening, characterized in that: The invention comprises a filling slurry conveying pipe (1), a casing cutting pipe (2), a bag storage pipe (3) and a guide head (4) which are coaxially connected and arranged in sequence from back to front; the filling slurry conveying pipe (1) comprises an outer pipe (11) and an inner pipe (12) which are coaxially sleeved, a main slurry conveying channel (13) is arranged in the inner pipe (12), and an auxiliary slurry conveying channel (14) is arranged between the outer pipe (11) and the inner pipe (12); The casing cutting pipe (2) is provided with a first mixed slurry conveying channel (21); The sac bag storage tube (3) is provided with a second mixed slurry conveying channel (31); the sac bag storage tube (3) is provided with a sac bag (5), and the bag opening of the sac bag (5) is connected to the casing cutting tube (2); The main filling slurry delivered through the main slurry delivery channel (13) and the auxiliary filling slurry delivered through the auxiliary slurry delivery channel (14) enter the first mixed slurry delivery channel (21) and are mixed to obtain a mixed slurry. The mixed slurry enters the second mixed slurry delivery pipeline (31) and can be used for grouting and filling the bag (5).

2. The filling and opening support stack construction device according to claim 1, characterized in that: A first high-pressure water delivery channel (15) is axially provided through the wall of the outer tube (11).

3. The filling and opening support stack construction device according to claim 2, characterized in that: The casing cutting tube (2) comprises a casing cutting tube body (22) and a fixed base (23) which are coaxially connected from back to front, an annular installation groove is formed at the connection between the casing cutting tube body (22) and the fixed base (23), and a rotating cutting blade head (24) is arranged in the annular installation groove; A second high-pressure water delivery channel (25) is axially penetrated through the wall of the casing cutting tube body (22) and can be coaxially connected to the first high-pressure water delivery channel (15); the second high-pressure water delivery channel (25) can also be connected to a deflected high-pressure water jet channel (241) obliquely arranged in the rotating cutting head (24); the deflected high-pressure water jet channel (241) is connected to a jet outlet arranged on the outer wall of the rotating cutting head (24); the rotating cutting head (24) can rotate under the drive of the high-pressure water flow, and the high-pressure water flow ejected from the jet outlet can cut the casing coaxially arranged outside the casing cutting tube (2).

4. The filling and opening support stack construction device according to claim 1, characterized in that: The sac bag storage tube (3) comprises a sac bag storage tube outer tube (32) and a sac bag storage tube inner tube (33); a storage space is formed between the sac bag storage tube outer tube (32) and the sac bag storage tube inner tube (33); the sac bag (5) is arranged in the storage space; the rear end of the sac bag storage tube outer tube (32) is connected to the rear end of the sac bag storage tube inner tube (33) via a connecting plate (34); the sac bag (5) is sleeved outside the sac bag storage tube inner tube (33); and the bag mouth of the sac bag (5) passes through an annular opening provided on the connecting plate (34) and is connected to the fixed base (23).

5. The filling and opening support stack construction device according to claim 3, characterized in that: The casing cutting pipe (2) is connected to the filling slurry conveying pipe (1) via a connector (6), and a third high-pressure water conveying channel (61) is axially opened in the connector (6). The third high-pressure water conveying channel (61) can be coaxially connected to the first high-pressure water conveying channel (15) and the second high-pressure water conveying channel (25).

6. The filling and opening support stack construction device according to claim 1, characterized in that: The front end surface of the sleeve cutting tube body (22) is concave to form an annular water passage cavity (221), and the annular water passage cavity (221) is respectively connected to the second high-pressure water delivery channel (25) and the deflected high-pressure water jet channel (241).

7. The filling and opening support stack construction device according to claim 1, characterized in that: The rotary cutting blade head (24) is connected to the casing cutting tube body (22) via a bearing (26).

8. A method for constructing a supporting pile for filling and opening, characterized in that: The method is implemented by a filling and opening support stack construction device according to any one of claims 1 to 7, comprising the following steps: Step 1: In the coal seam roof rock layer, a plurality of horizontal long boreholes are arranged along the length direction of the working face, and casing cementing is adopted, wherein the plurality of horizontal long boreholes are arranged at intervals along the width direction of the working face; Step 2: inserting a support pile construction device for filling and opening into the long horizontal borehole of the roof, and conveying the guide head to the end of the long horizontal borehole of the roof; Step 3: Use the casing cutting tube to spray high-pressure water to cut off the casing to form a bag delivery channel; Step 4, filling the main filling slurry through the main slurry conveying channel, filling the auxiliary filling slurry through the auxiliary slurry conveying channel, the main filling slurry and the auxiliary filling slurry enter the first mixed slurry conveying channel and mix to obtain a mixed slurry; after the mixed slurry enters the second mixed slurry conveying pipeline, the bag is grout-filled and pushed into the goaf; the bag is filled with the mixed slurry to construct a support pile for filling and mining; Step 5: lift the filling opening support stack construction device to the orifice; install the bladder bag; Step 6: lower the filling and opening support pile construction device into the horizontal long borehole of the roof to the next filling position; Step 7, repeat steps 3 to 6 until the construction of the filling opening support stacks at all filling positions is completed, and a plurality of filling opening support stacks spaced apart along the length direction of the working belt are obtained.

9. The method for constructing a supporting pile for filling and opening as claimed in claim 8, characterized in that: The main filling material includes a paste filling slurry made of coal gangue, fly ash, aeolian sand, cement and the like, and the auxiliary filling material is a liquid quick-setting agent.

10. The method for constructing a supporting pile for filling and opening as claimed in claim 8, characterized in that: The layout interval of the edges of adjacent support piles along the length direction of the working surface is 5 to 15m; the layout interval of the edges of adjacent support piles along the width direction of the working surface is 0 to 15m.

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