Concrete slurry delivery system and method of delivering concrete slurry

Abstract

The present application provides a kind of concrete slurry conveying system and concrete slurry conveying method, the concrete slurry conveying system includes spare fully mechanized face roadway and fully mechanized face transport crossheading arranged side by side, and the concrete slurry conveying system further includes: grouting hole, grouting hole is used to connect spare fully mechanized face roadway and fully mechanized face transport crossheading;Conveying pump, it is arranged at the side of grouting hole near spare fully mechanized face roadway;Grouting pump, it is arranged at the side of grouting hole near fully mechanized face transport crossheading;Flexible mould, grouting pump is connected with flexible mould by conveying pipeline, so that conveying pump passes through grouting hole and enters into grouting pump into concrete slurry, and makes concrete slurry enter into flexible mould in sequence after passing through conveying pipeline, solve the problem of low efficiency of concrete slurry conveying system in the prior art.

Description

Technical Field

[0001] This invention relates to the field of coal mining, and more specifically, to a concrete slurry conveying system and a concrete slurry conveying method. Background Technology

[0002] As coal resources become increasingly scarce, coal mining companies are also beginning to place great emphasis on resource recovery rates.

[0003] The longwall mining technology for the goaf-side longwall face is a pillarless mining technology with a high resource recovery rate, and it has been rapidly promoted in recent years.

[0004] In fully mechanized longwall mining with goaf retention, the roadway along the goaf side of the working face is preserved as the roadway for the next fully mechanized longwall mining face. This eliminates the need for coal pillars between the two working faces and reduces the amount of excavation work required for one roadway. The preservation method involves constructing a concrete wall parallel to the roadway along the goaf side of the roadway, with a wall thickness generally between 1000mm and 1500mm.

[0005] The equipment used for concrete wall construction consists of a ground concrete mixing plant, concrete transport trucks, concrete pumps, concrete pipelines, flexible concrete formwork, rock retaining supports, and gantry supports.

[0006] The construction process for this wall is as follows:

[0007] like Figure 1 As shown in the figure, the labels are as follows: 1' is a concrete transport truck, 2' is a backup fully mechanized mining face opening, 3' is a goaf retainer, 4' is a shunting tunnel, 5' is a grouting pump, 6' is a concrete conveying pipeline, 7' is a flexible formwork, 8' is a concrete wall, 9' is a portal frame, 10' is a rock retaining support, 11' is a fully mechanized mining face, 12' is the advance direction of the fully mechanized mining face, 13' is a conveyor belt transport roadway of the fully mechanized mining face, and 14' is a return airway of the fully mechanized mining face.

[0008] After the longwall face 11' advances, the retaining wall support 10' located on the goaf side of the wall is moved forward, closely following the end support of the working face, and the portal frame support 9' is moved forward simultaneously, closely following the end of the working face. Then, a flexible formwork 7' (generally made of woven plastic fabric with flame-retardant and anti-static properties) is erected between the retaining wall support 10' and the portal frame support 9'. The ground mixing plant mixes the concrete slurry, which is transported by concrete truck 1' to the concrete grouting pump 5' (a plunger pump) installed in the roadway behind the portal frame support 9'. The concrete is then pumped to the flexible formwork 7' and injected into it, finally filling the flexible formwork 7' (to the top). After the concrete inside the flexible formwork solidifies, it forms a wall.

[0009] The existing wall construction techniques have the following problems:

[0010] (1) The distance for transporting concrete is too long. The route for concrete transport trucks is: transport roadway of the standby fully mechanized mining face → opening cut of the standby fully mechanized mining face → goaf section (return air roadway of the standby face) → grouting pump. The length of the roadway of a large fully mechanized mining face can reach more than 6,000m, which means that the maximum detour distance for concrete transport trucks will reach more than 12,000m, which is time-consuming, inefficient and fuel-intensive.

[0011] (2) The roadway in the goaf-retention section is narrow, and the capacity of the concrete mixer truck is small. The wall thickness of the goaf-retention section is generally about 1200mm, of which 50% of the wall occupies the roadway space, thus reducing the roadway width by 600mm. Therefore, the loading capacity of the concrete mixer truck is generally no more than 4m³. 3 To resist the pressure from the mine roof, the width of some sections of the roadway was reduced to less than 4000mm, and the loading capacity of the concrete mixer trucks was also reduced to 2m. 3 .

[0012] (3) The depth of the shunting tunnel exceeds the regulations. The length of a concrete mixer truck is generally about 9m. When shunting in the goaf section, the effective utilization width of the tunnel is narrow because drainage pipes, grouting pipes, nitrogen injection pipes, water supply pipes, etc. are also laid in the goaf section. The corresponding depth of the shunting tunnel is generally about 8m, which exceeds the requirement of no more than 6m.

[0013] (4) There are many pieces of equipment at the work site, and there is a lot of interference between various operations, which makes it easy for safety accidents to occur. At the grouting pump filling site, there are generally no less than two concrete mixer trucks, plus filling personnel, gantry support relocation personnel, flexible formwork support personnel, etc., with people coming and going in front and behind the vehicles, and many procedures being carried out at the same time on site, which makes it easy for safety accidents to occur. Summary of the Invention

[0014] The main objective of this invention is to provide a concrete slurry conveying system and a concrete slurry conveying method to solve the problem of low efficiency in existing concrete slurry conveying systems.

[0015] To achieve the above objectives, according to one aspect of the present invention, a concrete slurry conveying system is provided, comprising a backup fully mechanized mining face roadway and a fully mechanized mining face transport roadway arranged in parallel. The concrete slurry conveying system further includes: a grouting hole for connecting the backup fully mechanized mining face roadway and the fully mechanized mining face transport roadway; a conveying pump disposed on the side of the grouting hole near the backup fully mechanized mining face roadway; a grouting pump disposed on the side of the grouting hole near the fully mechanized mining face transport roadway; and a flexible mold, wherein the grouting pump is connected to the flexible mold via a conveying pipe, so that the conveying pump introduces concrete slurry into the grouting pump through the grouting hole, and the concrete slurry sequentially passes through the conveying pipe and enters the flexible mold.

[0016] Furthermore, the concrete slurry delivery system also includes a sleeve installed inside the grouting hole, through which the delivery pump is connected to the grouting pump.

[0017] Furthermore, shunting chambers and feeding chambers are respectively set on the opposite side walls of the backup fully mechanized mining face roadway. The openings of the shunting chambers and the feeding chambers are set opposite to each other. The feeding chambers are used to install conveying pumps so that concrete transport trucks can be shunted in the shunting chambers and then moved into the feeding chambers to unload concrete slurry into the hopper of the conveying pumps.

[0018] Furthermore, a grouting chamber is installed on the side wall of the fully mechanized mining face transport roadway near the backup fully mechanized mining face roadway. The grouting chamber is used to install grouting pumps.

[0019] Furthermore, the feeding chamber and the grouting chamber are arranged opposite each other so that the extension direction of the grouting hole is perpendicular to the extension direction of the standby fully mechanized mining face roadway and the extension direction of the fully mechanized mining face transport roadway.

[0020] Furthermore, the shunting tunnel, the feeding tunnel, the grouting hole, and the grouting chamber together form a grouting structure; there are multiple grouting structures, which are distributed at intervals along the extension direction of the transport roadway of the fully mechanized mining face.

[0021] Furthermore, the centerline of the feeding chamber, the centerline of the grouting chamber, and the centerline of the grouting hole coincide.

[0022] Furthermore, the diameter of the grouting hole is greater than or equal to 200 mm.

[0023] According to another aspect of the present invention, a method for conveying concrete slurry is provided, applicable to the above-mentioned concrete slurry conveying system. The method includes: drilling a grouting hole between a standby fully mechanized mining face roadway and a fully mechanized mining face transport roadway to connect the standby fully mechanized mining face roadway and the fully mechanized mining face transport roadway; installing a conveying pump on the side of the grouting hole closer to the standby fully mechanized mining face roadway; and installing a grouting pump on the side of the grouting hole closer to the fully mechanized mining face transport roadway, so that the conveying pump is connected to the grouting pump through the grouting hole.

[0024] Furthermore, the concrete slurry conveying method also includes: processing shunting chambers and feeding chambers for installing conveying pumps on opposite side walls of the standby fully mechanized mining face roadway, with the openings of the shunting chambers and the feeding chambers being positioned opposite each other; processing a grouting chamber for installing a grouting pump on the side wall of the fully mechanized mining face transport roadway near the standby fully mechanized mining face roadway; wherein, the two ends of the grouting hole are connected to the shunting chamber and the feeding chamber.

[0025] Applying the technical solution of this invention, the concrete slurry conveying system includes a backup fully mechanized mining face roadway and a fully mechanized mining face transport roadway arranged in parallel. The system also includes a grouting hole, a conveying pump, a grouting pump, and a flexible mold. The grouting hole connects the backup fully mechanized mining face roadway and the fully mechanized mining face transport roadway. The conveying pump is located on the side of the grouting hole closest to the backup fully mechanized mining face roadway. The grouting pump is located on the side of the grouting hole closest to the fully mechanized mining face transport roadway. The grouting pump is connected to the flexible mold via a conveying pipeline, allowing the conveying pump to pass concrete slurry into the grouting pump through the grouting hole, and the concrete slurry sequentially passes through the conveying pipeline and enters the flexible mold. In this way, concrete slurry can be directly input into the flexible mold through the grouting hole. After the flexible mold is filled (to the top), the concrete inside the flexible mold solidifies to form a wall, thus solving the problem of low efficiency in existing concrete slurry conveying systems. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 A structural schematic diagram of an embodiment of a concrete slurry conveying system according to the prior art is shown; and

[0028] Figure 2 A schematic diagram of an embodiment of the concrete slurry conveying system according to the present invention is shown.

[0029] The above figures include the following reference numerals:

[0030] 1. Concrete transport truck; 2. Shunting chamber; 3. Feeding chamber; 4. Conveying pump; 5. Grouting hole; 6. Grouting pump; 7. Conveying pipeline; 8. Flexible formwork; 9. Portal support; 10. Rockfill support; 11. Longwall face; 12. Advance direction; 13. Longwall face transport roadway; 14. Return airway; 20. Backup longwall face roadway; 21. Grouting chamber. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] This invention provides a concrete slurry conveying system, comprising a spare fully mechanized mining face roadway 20 and a fully mechanized mining face transport roadway 13 arranged in parallel, such as... Figure 2As shown, the concrete slurry conveying system also includes: a grouting hole 5, which connects the backup fully mechanized mining face roadway 20 and the fully mechanized mining face transport roadway 13; a conveying pump 4, which is located on the side of the grouting hole 5 near the backup fully mechanized mining face roadway 20; a grouting pump 6, which is located on the side of the grouting hole 5 near the fully mechanized mining face transport roadway 13; and a flexible mold 8, wherein the grouting pump 6 is connected to the flexible mold 8 through a conveying pipe 7, so that the conveying pump 4 can pass concrete slurry into the grouting pump 6 through the grouting hole 5, and the concrete slurry can pass through the conveying pipe 7 and enter the flexible mold 8 in sequence.

[0033] The concrete slurry conveying system of this invention includes a spare fully mechanized mining face roadway 20 and a fully mechanized mining face transport roadway 13 arranged in parallel. The system also includes a grouting hole 5, a conveying pump 4, a grouting pump 6, and a flexible mold 8. The grouting hole 5 connects the spare fully mechanized mining face roadway 20 and the fully mechanized mining face transport roadway 13. The conveying pump 4 is located on the side of the grouting hole 5 closest to the spare fully mechanized mining face roadway 20. The grouting pump 6 is located on the side of the grouting hole 5 closest to the fully mechanized mining face transport roadway 13. The grouting pump 6 is connected to the flexible mold 8 via a conveying pipe 7, allowing the conveying pump 4 to pump concrete slurry into the grouting pump 6 through the grouting hole 5, and the concrete slurry to sequentially pass through the conveying pipe 7 and enter the flexible mold 8. Thus, concrete slurry can be directly input into the flexible mold 8 through the grouting hole 5. After the flexible mold 8 is filled (to the top), the concrete inside the flexible mold 8 solidifies to form a wall, thereby solving the problem of low efficiency in existing concrete slurry conveying systems.

[0034] In softer coal seams, to prevent borehole collapse, a casing can be installed in the borehole to transport concrete slurry. Therefore, in this embodiment, the concrete slurry transport system further includes a casing installed inside the grouting hole 5, and the transport pump 4 is connected to the grouting pump 6 through the casing.

[0035] In this embodiment, as Figure 2 As shown, a shunting chamber 2 and a feeding chamber 3 are respectively installed on the opposite side walls of the standby fully mechanized mining face roadway 20. The opening of the shunting chamber 2 is opposite to the opening of the feeding chamber 3. The feeding chamber 3 is used to install the conveying pump 4 so that the concrete transport truck 1 can be shunted in the shunting chamber 2 and then moved into the feeding chamber 3 to unload concrete slurry into the hopper of the conveying pump 4.

[0036] In this embodiment, a grouting chamber 21 is provided on the side wall of the fully mechanized mining face transport roadway 13 near the backup fully mechanized mining face roadway 20. The grouting chamber 21 is used to install the grouting pump 6.

[0037] In this embodiment, the feeding chamber 3 and the grouting chamber 21 are arranged opposite to each other so that the extension direction of the grouting hole 5 is perpendicular to the extension direction of the standby fully mechanized mining face roadway 20 and the extension direction of the fully mechanized mining face transport roadway 13.

[0038] In this embodiment, the shunting tunnel 2, the feeding tunnel 3, the grouting hole 5, and the grouting tunnel 21 form a grouting structure; there are multiple grouting structures, which are distributed at intervals along the extension direction of the fully mechanized mining face transport roadway 13.

[0039] For ease of construction, such as Figure 2 As shown, the center line of the feeding chamber 3, the center line of the grouting chamber 21, and the center line of the grouting hole 5 coincide.

[0040] Specifically, the diameter of the grouting hole 5 is greater than or equal to 200 mm.

[0041] The present invention also provides a concrete slurry conveying method applicable to the above-mentioned concrete slurry conveying system. The concrete slurry conveying method includes: drilling a grouting hole 5 between the standby fully mechanized mining face roadway 20 and the fully mechanized mining face transport roadway 13 to connect the standby fully mechanized mining face roadway 20 and the fully mechanized mining face transport roadway 13; installing a conveying pump 4 on the side of the grouting hole 5 near the standby fully mechanized mining face roadway 20; and installing a grouting pump 6 on the side of the grouting hole 5 near the fully mechanized mining face transport roadway 13, so that the conveying pump 4 is connected to the grouting pump 6 through the grouting hole 5.

[0042] In this embodiment, the concrete slurry conveying method further includes: processing a shunting chamber 2 and a feeding chamber 3 for installing a conveying pump 4 on opposite side walls of the standby fully mechanized mining face roadway 20, and setting the openings of the shunting chamber 2 and the feeding chamber 3 opposite to each other; processing a grouting chamber 21 for installing a grouting pump 6 on the side wall of the fully mechanized mining face transport roadway 13 near the standby fully mechanized mining face roadway 20; wherein, the two ends of the grouting hole 5 are connected to the shunting chamber 2 and the feeding chamber 3.

[0043] The concrete slurry conveying system in this invention is a concrete slurry conveying system for a fully mechanized mining face with a goaf retention roadway. A conveying pump is added to the transport roadway of the standby face, and a hole is drilled from the transport roadway of the standby face to the transport roadway of the mining face. The concrete slurry is directly conveyed to the grouting pump 6 through the hole and injected into the flexible mold 8.

[0044] In addition, the concrete slurry conveying system also includes a return airway 14. For example... Figure 2 As shown, the direction of advancement of the working face, 12, has been marked.

[0045] This invention relates to a concrete slurry conveying system for a fully mechanized mining face with a goaf retention roadway. The system consists of a concrete transport truck 1, a shunting chamber 2, a feeding chamber 3, a conveying pump 4, a borehole (grouting hole 5), a grouting pump 6, a conveying pipeline 7, and a flexible formwork 8.

[0046] The process of injecting concrete grout is as follows: after the concrete transport truck 1 is shunted in the shunting chamber 2, it moves back to the feeding chamber 3 and unloads concrete grout into the hopper of the conveying pump 4. The concrete grout is pressurized by the conveying pump 4 and then conveyed through the drilling to the grouting pump 6, and then injected into the flexible mold 8 through the conveying pipeline 7.

[0047] Shunting chamber 2 and feeding chamber 3 are located on both sides of the standby fully mechanized mining face roadway 20, with their openings facing each other and also directly opposite the grouting chamber 21 in the fully mechanized mining face transport roadway 13. The depth of each chamber does not exceed 6m. Shunting chamber 2 and feeding chamber 3 are installed at regular intervals on both sides of the standby fully mechanized mining face roadway 20; this interval is generally 800m or twice the conveying distance of the grouting pump 6.

[0048] The conveying pump 4 is installed in the feeding chamber 3. It is a plunger pump that conveys concrete slurry to the borehole (grouting hole 5). The distance for conveying concrete is not less than 300m or not less than the width of the fully mechanized mining face 11. The conveying capacity per hour is approximately equal to that of the grouting pump 6.

[0049] Grouting hole 5 is a concrete slurry delivery hole, and the borehole diameter is generally not less than 200mm. In hard coal seams, concrete slurry can be delivered directly through the borehole.

[0050] The grouting pump 6 is installed in the grouting chamber 21 of the transport roadway 13 of the fully mechanized mining face. In order to be installed in advance, the receiving hopper receives the concrete slurry transported by the borehole and pressurizes and transports the concrete slurry to the conveying pipe 7, which then injects it into the flexible mold 8 to complete the concrete filling of the flexible mold 8.

[0051] After the fully mechanized mining face 11 advances, the retaining wall support 10 on the goaf side located at the wall position is moved forward, closely following the support at the end of the working face, and the portal frame 9 is moved forward simultaneously, closely following the end of the working face. Then, a flexible formwork 8 (generally made of plastic woven fabric with flame-retardant and anti-static properties) is erected between the retaining wall support 10 and the portal frame 9; the ground mixing plant mixes the concrete slurry, which is transported by concrete truck 1 to the concrete grouting pump 6 (a plunger pump) installed in the grouting chamber 21 at the fully mechanized mining face transport roadway 13 behind the portal frame 9. The concrete is then delivered to the flexible formwork 8 through the grouting pump 6 and injected into the flexible formwork 8, finally filling the flexible formwork 8 (to the top). After the concrete in the flexible formwork 8 solidifies, it forms a wall.

[0052] Specific experiments included: After a mine switched to a borehole concrete slurry delivery system, the number of concrete transport trucks decreased from 20 to 8, and the loading capacity of a single truck increased from 2m³. 3 Increased to 6m 3 Furthermore, the total transport capacity increased by 20%, while vehicle fuel consumption decreased by 50%. The depth of the vehicle shunting tunnel 2 was reduced from 8m to 5.8m, complying with the regulation of not exceeding 6m. There are no other operations at the vehicle unloading slurry operation site, ensuring greater safety.

[0053] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0054] (1) Reduced vehicle transport distance. The concrete transport truck 1 no longer needs to detour through the roadway, which can reduce the transport distance by up to 11,000m, shorten the time, increase vehicle turnover, reduce fuel consumption, and reduce the number of vehicles used by 40%.

[0055] (2) The narrow sections of the roadway with gaps along the road are no longer present; the entire transportation route consists of full-size roadway sections, and the capacity of the concrete mixer truck has been increased from 2m³ to 1m³. 3 ~4m 3 Increased to 6m 3 The number of vehicles used has further decreased.

[0056] (3) The depth of the shunting tunnel meets the requirements. Due to the large cross-section of the shunting roadway, shunting can be carried out smoothly even when the depth of the shunting tunnel is less than 6m.

[0057] (4) The concrete transport truck 1 unloads in the feeding chamber 3 of the backup fully mechanized mining face roadway 20 of the backup working face. There are no other operations at this location, and safe production is easily guaranteed.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A concrete slurry conveying system, comprising a spare fully mechanized mining face roadway (20) and a fully mechanized mining face transport roadway (13) arranged in parallel, characterized in that, The concrete slurry delivery system also includes: Grouting hole (5), the grouting hole (5) is used to connect the backup fully mechanized mining face roadway (20) and the fully mechanized mining face transport roadway (13); A delivery pump (4) is installed on the side of the grouting hole (5) near the backup fully mechanized mining face roadway (20); The grouting pump (6) is located on the side of the grouting hole (5) near the transport roadway (13) of the fully mechanized mining face; The flexible mold (8) is connected to the grouting pump (6) through the delivery pipe (7) so that the delivery pump (4) can pass concrete slurry into the grouting pump (6) through the grouting hole (5) and the concrete slurry can pass through the delivery pipe (7) and enter the flexible mold (8) in sequence. The backup fully mechanized mining face roadway (20) is provided with a shunting chamber (2) and a feeding chamber (3) on opposite side walls. The opening of the shunting chamber (2) is opposite to the opening of the feeding chamber (3). The feeding chamber (3) is used to install the conveying pump (4) so ​​that the concrete transport truck (1) can be shunted in the shunting chamber (2) and then moved into the feeding chamber (3) to unload concrete slurry into the hopper of the conveying pump (4).

2. The concrete slurry conveying system according to claim 1, characterized in that, The concrete slurry delivery system also includes: A casing is installed inside the grouting hole (5), and the delivery pump (4) is connected to the grouting pump (6) through the casing.

3. The concrete slurry conveying system according to claim 1, characterized in that, A grouting chamber (21) is provided on the side wall of the fully mechanized mining face transport roadway (13) near the backup fully mechanized mining face roadway (20), and the grouting chamber (21) is used to install the grouting pump (6).

4. The concrete slurry conveying system according to claim 3, characterized in that, The feeding chamber (3) and the grouting chamber (21) are arranged opposite to each other so that the extension direction of the grouting hole (5) is perpendicular to the extension direction of the backup fully mechanized mining face roadway (20) and the extension direction of the fully mechanized mining face transport roadway (13).

5. The concrete slurry conveying system according to claim 3, characterized in that, The shunting tunnel (2), the feeding tunnel (3), the grouting hole (5), and the grouting tunnel (21) constitute a grouting structure; The grouting structure is in multiple sets, and the multiple sets of grouting structures are distributed at intervals along the extension direction of the fully mechanized mining face transport roadway (13).

6. The concrete slurry conveying system according to claim 5, characterized in that, The centerline of the feeding chamber (3), the centerline of the grouting chamber (21), and the centerline of the grouting hole (5) coincide.

7. The concrete slurry conveying system according to any one of claims 1 to 6, characterized in that, The diameter of the grouting hole (5) is greater than or equal to 200 mm.

8. A method for conveying concrete slurry, characterized in that, The concrete slurry conveying system applicable to any one of claims 1 to 7, the concrete slurry conveying method comprising: Grouting holes (5) are drilled between the backup fully mechanized mining face roadway (20) and the fully mechanized mining face transport roadway (13) to connect the backup fully mechanized mining face roadway (20) and the fully mechanized mining face transport roadway (13). A delivery pump (4) is installed on the side of the grouting hole (5) near the backup fully mechanized mining face roadway (20). A grouting pump (6) is installed on the side of the grouting hole (5) near the transport roadway (13) of the fully mechanized mining face, so that the transport pump (4) is connected to the grouting pump (6) through the grouting hole (5).

9. The method for conveying concrete slurry according to claim 8, characterized in that, The concrete slurry delivery method further includes: On the opposite side walls of the backup fully mechanized mining face roadway (20), a shunting chamber (2) and a feeding chamber (3) for installing the conveying pump (4) are machined, and the openings of the shunting chamber (2) and the feeding chamber (3) are arranged opposite to each other. A grouting chamber (21) for installing the grouting pump (6) is machined on the side wall of the fully mechanized mining face transport roadway (13) near the backup fully mechanized mining face roadway (20). The two ends of the grouting hole (5) are connected to the grouting chamber (21) and the feeding chamber (3).

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