A grouting process for overburden separation layer used for coal mining

Abstract

The present invention discloses a grouting process for overburden separation layer for coal mining. In the technical scheme of the present invention, a support fixed pipeline distribution grouting method is adopted, the grouting pipeline is fixed by a support plate, and then low and high concentration slurries are injected in sequence through the grouting pipeline. At the same time, a stirring structure is arranged inside the grouting pipeline to stir the grouting slurry. In a technical scheme of grouting process for overburden separation layer for coal mining of the present invention, a retractable support plate structure is arranged on the outer wall of the grouting pipeline to support and fix the grouting pipeline during the grouting process, so as to reduce the influence of the high grouting pressure during the grouting process on the grouting pipeline. At the same time, the technical scheme of the present invention has several groups of stirring structures rotatably installed inside the grouting pipeline, which can produce a certain stirring effect on the grouting slurry by utilizing the impact force generated by the grouting slurry during grouting to drive the rotation.

Description

Technical Field

[0001] The invention relates to the technical field of overburden rock separation layer grouting, in particular to an overburden rock separation layer grouting process for coal mining. Background Art

[0002] After the goaf of a coal mine collapses, it has a destructive effect on arable land and groundwater. Many coal mines have adopted anti-sinking technology for goafs, but it is often a temporary solution, filling up the collapsed area and then collapsing it. The reason why the overburden delamination grouting technology is superior to other traditional surface subsidence reduction technologies and can more effectively protect the ecological environment is that it takes the initiative to prevent and control in advance. When the delamination appears in the upper strata of the coal mining goaf and has not collapsed, the "needle-in-the-slot" grouting treatment is carried out as soon as possible, thereby maintaining a relatively stable stratum structure and avoiding the formation of a collapse area and the passive treatment of "closing the fold after the sheep have been lost" after the stratum is damaged. The coal pillar overburden delamination (key layer) grouting subsidence reduction technology is mainly used for ground subsidence control and solid waste treatment in goafs, and at the same time, it is expanded to protect aquifers, reduce mine water inflow, prevent and control rock bursts, and enhance foundation bearing capacity.

[0003] The overburden delamination grouting technology utilizes the delamination space formed in the overburden stratum after coal seam mining. A pressure pump is used to inject coal gangue powder, fly ash, cement or a mixture slurry into the delamination layer under the key layer through a grouting pipe. After the slurry settles, the water is removed and the ash remains to form a saturated compacted body, thereby supporting the upper key layer and forming a bearing body of "delamination zone filling body (compacted zone) + coal pillar + key layer", ensuring that the upper rock layer and the ground are not damaged or deformed.

[0004] However, there are still various problems in the existing overburden delamination grouting process. First, in the overburden delamination grouting, the grouting pipe is usually long. After the slurry is transported out of the slurry mixing equipment, it needs to pass through a long pipe to reach the grouting point. Therefore, the slurry often lacks stirring for a long time and hardens unevenly. In addition, in the overburden delamination grouting, a higher grouting pressure is usually required, and the higher grouting pressure will also affect the grouting pipe.

[0005] In view of this, we propose a grouting process for overburden separation for coal mining. A support plate structure is set on the outer wall of the grouting pipe to support and fix the grouting pipe, reducing the impact of grouting pressure on the grouting pipe. At the same time, a stirring structure is rotatably installed in the grouting pipe, and the impact force of the slurry during grouting is used to drive the rotation, which can produce a certain stirring effect on the slurry.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] In order to solve the problems raised in the above-mentioned background technology, the technical solution of the present invention proposes a grouting process for overburden separation of coal mining, in which a retractable support plate structure is arranged on the outer wall of the grouting pipe, for supporting and fixing the grouting pipe during the grouting process, thereby reducing the influence of the grouting pressure on the grouting pipe. At the same time, the technical solution of the present invention has several groups of stirring structures rotatably installed in the grouting pipe, which are driven to rotate by the impact force of the slurry during grouting, thereby producing a certain stirring effect on the slurry.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A grouting process for overburden separation layer for coal mining, specifically comprising the following steps:

[0010] 1. Preparation stage:

[0011] S1. Measure drilling holes:

[0012] The position of the key layer is determined by combining on-site measurement and theoretical calculation, the drilling position and drilling spacing are determined according to the slurry concentration and grouting pressure, and the grouting drilling is completed;

[0013] S2. Equipment installation:

[0014] Install the grouting mixing equipment, high-pressure pump and grouting pipes required for grouting according to the drilling position, select the appropriate number of grouting pipes according to the drilling depth, and install the grouting pipes in combination;

[0015] S3. Pipeline fixing:

[0016] After the slurry mixing equipment, high-pressure pump and grouting pipeline are installed, the upper slider and the lower slider on the grouting single pipe are controlled to move downward and upward respectively, and the upper slider and the lower slider drive the support plate to expand outward, and the support plate contacts the inner wall of the borehole to complete the support of the grouting pipeline;

[0017] 2. Grouting stage:

[0018] S4, Grouting 1:

[0019] After the grouting pipe is fixed, low-concentration mud is first injected through the low-concentration pipe to fill the smaller rock gaps and solidify the ore fragments and rock formations;

[0020] S5, Grouting 2:

[0021] After low-concentration mud grouting is completed through the low-concentration pipeline, high-concentration concrete slurry grouting is then carried out through the high-concentration pipeline to form a solid filling body;

[0022] 3. Closing stage:

[0023] S6. Disassembly:

[0024] After the grouting is completed, the slurry mixing equipment, high-pressure pump and grouting pipeline will be dismantled and transferred to the next drilling site for subsequent grouting process.

[0025] In the technical solution of the present invention, the grouting pipeline includes several groups of grouting single tubes, and the several groups of grouting single tubes respectively include two groups of connecting components, a pipeline component and several groups of supporting components. The two groups of connecting components are respectively located at both ends of the grouting single tubes, and the connecting components are used to connect the several groups of grouting single tubes. The pipeline component is located inside the grouting single tube, and the pipeline component is used to transport grouting slurry. The several groups of supporting components are respectively located on the outer walls of the grouting single tubes, and the several groups of supporting components are used to support and fix the grouting single tubes.

[0026] Furthermore, the pipeline assembly includes a high-concentration pipeline and a low-concentration pipeline, the high-concentration pipeline is used to transport high-concentration concrete slurry, and the low-concentration pipeline is used to transport low-concentration mud. In the technical solution of the present invention, low-concentration mud grouting is first performed through the low-concentration pipeline to fill smaller rock formation gaps that are difficult for higher-concentration concrete slurries to enter, while solidifying ore fragments and rock formations. After the low-concentration mud grouting is completed through the low-concentration pipeline, high-concentration concrete slurry grouting is performed through the high-concentration pipeline to further form a solid filling body.

[0027] Furthermore, a plurality of mounting grooves are provided on the inner wall of the high-concentration pipeline, a plurality of stirring assemblies are fixedly installed inside the plurality of mounting grooves, and the plurality of stirring assemblies respectively include mounting shafts and a plurality of stirring blades, the mounting shafts are fixedly installed inside the mounting grooves, a plurality of stirring blades are rotatably installed on the mounting shafts, and a plurality of stirring blades can rotate freely on the mounting shafts, so that the rotation can be driven by utilizing the impact force generated by the grouting slurry during grouting, and a certain stirring effect can be produced on the grouting slurry.

[0028] Furthermore, several groups of the support assemblies respectively include an upper slider, a lower slider and two groups of support plates, the upper slider is slidably installed on the upper end of the grouting single tube, the lower slider is slidably installed on the lower end of the grouting single tube, the two groups of support plates are respectively located in the middle of the upper slider and the lower slider, a first connecting shaft is respectively provided between the upper slider and the lower slider and the two groups of support plates, and they are rotatably connected through the first connecting shaft, a second connecting shaft is provided between the two groups of support plates, and they are rotatably connected through the second connecting shaft.

[0029] Furthermore, the upper slider and the lower slider are each provided with a built-in power supply and a driving motor to control the sliding of the upper slider and the lower slider. The sliding of the upper slider and the lower slider can drive the support plate to rotate and expand outward through the first connecting shaft and the second connecting shaft. The support plate contacts the inner wall of the borehole to complete the support of the grouting pipe.

[0030] Effective gain: In summary, the present invention proposes a grouting process for overburden separation in coal mining, in which a retractable support plate structure is arranged on the outer wall of the grouting pipe to support and fix the grouting pipe during the grouting process, so as to reduce the influence of the higher grouting pressure during the grouting process on the grouting pipe. At the same time, the technical solution of the present invention has several groups of stirring structures rotatably installed inside the grouting pipe, which can drive the rotation by utilizing the impact force generated by the grouting slurry during grouting, thereby producing a certain stirring effect on the grouting slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a grouting process system for overburden separation used for coal mining according to the present invention Figure 1 ;

[0032] Figure 2 A schematic diagram of a grouting process system for overburden separation used for coal mining according to the present invention Figure 2 ;

[0033] Figure 3 This is a schematic diagram of the grouting pipeline structure of the overburden rock separation grouting process for coal mining according to the present invention;

[0034] Figure 4 This is an enlarged view of the grouting pipeline structure of a grouting process for overburden separation used for coal mining according to the present invention;

[0035] Figure 5 A schematic diagram of a grouting single pipe structure for a grouting process for overburden separation used for coal mining according to the present invention Figure 1 ;

[0036] Figure 6 The invention is a magnified grouting single pipe structure for a grouting process of overburden separation layer used for coal mining Figure 1 ;

[0037] Figure 7 The invention is a magnified grouting single pipe structure for a grouting process of overburden separation layer used for coal mining Figure 2 ;

[0038] Figure 8 A top view of a grouting single-tube structure of a grouting process for overburden separation used for coal mining according to the present invention;

[0039] Fig. 9 A schematic diagram of a grouting single pipe structure for a grouting process for overburden separation used for coal mining according to the present invention Figure 2 ;

[0040] Fig.10 A schematic diagram of a grouting single pipe structure for a grouting process for overburden separation used for coal mining according to the present invention Figure 3 ;

[0041] Fig.11 This is a process flow chart of overburden rock separation grouting for coal mining according to the present invention;

[0042] In the figure: 100, grouting pipe; 110, grouting single pipe; 111, connecting assembly; 112, pipe assembly; 112-1, high-concentration pipe; 112-2, low-concentration pipe; 112-3, mounting groove; 112-4, stirring assembly; 112-41, mounting shaft; 112-42, stirring blade; 113, supporting assembly; 113-1, upper slider; 113-2, lower slider; 113-3, support plate; 113-4, first connecting shaft; 113-5, second connecting shaft. DETAILED DESCRIPTION

[0043] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0045] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, in the description of the present invention, “several” means two or more than two, unless otherwise clearly and specifically defined.

[0047] In order to solve the problems raised in the above-mentioned background technology, an embodiment of the present invention proposes a grouting process for overburden separation of coal mining, in which a retractable support plate structure is arranged on the outer wall of the grouting pipe to support and fix the grouting pipe during the grouting process, so as to reduce the influence of the higher grouting pressure during the grouting process on the grouting pipe. At the same time, in the technical scheme of the embodiment of the present invention, several groups of stirring structures are rotatably installed inside the grouting pipe, which can drive the rotation by utilizing the impact force generated by the grouting slurry during grouting, thereby producing a certain stirring effect on the grouting slurry.

[0048] like Fig.11 As shown, this embodiment provides a grouting process for overburden separation for coal mining, which specifically includes the following steps:

[0049] 1. Preparation stage:

[0050] S1. Measure drilling holes:

[0051] The position of the key layer is determined by combining on-site measurement and theoretical calculation, the drilling position and drilling spacing are determined according to the slurry concentration and grouting pressure, and the grouting drilling is completed;

[0052] S2. Equipment installation:

[0053] The slurry mixing equipment, high pressure pump and grouting pipeline 100 required for grouting are installed according to the drilling position, and according to the drilling depth, a suitable number of grouting single pipes 110 are selected and assembled and installed. Figure 1 As shown;

[0054] S3. Pipeline fixing:

[0055] After the slurry mixing equipment, high-pressure pump and grouting pipe 100 are installed, the upper slider 113-1 and the lower slider 113-2 on the grouting single pipe 110 are controlled to move downward and upward respectively, and the upper slider 113-1 and the lower slider 113-2 drive the support plate 113-3 to expand outward, and the support plate 113-3 contacts the inner wall of the borehole to complete the support of the grouting pipe 100. Figure 2 As shown;

[0056] 2. Grouting stage:

[0057] S4, Grouting 1:

[0058] After the grouting pipe 100 is fixed, low-concentration mud is first injected through the low-concentration pipe 112-2 to fill the smaller rock formation gaps and solidify the ore fragments and rock formations;

[0059] S5, Grouting 2:

[0060] After low-concentration mud grouting is completed through the low-concentration pipeline 112-2, high-concentration concrete slurry grouting is performed through the high-concentration pipeline 112-1 to form a solid filling body;

[0061] 3. Closing stage:

[0062] S6. Disassembly:

[0063] After the grouting is completed, the slurry mixing equipment, the high-pressure pump and the grouting pipeline 100 are disassembled and transferred to the next drilling location for subsequent grouting process.

[0064] In this embodiment, if Figure 3 and Figure 4 As shown, the grouting pipeline 100 includes several groups of grouting single pipes 110, such as Figure 5 As shown, several groups of grouting single tubes 1110 respectively include two groups of connecting components 111, a pipeline component 112 and several groups of supporting components 113. The two groups of connecting components 111 are respectively located at the two ends of the grouting single tube 110, the connecting components 111 are used to connect several groups of grouting single tubes 110, the pipeline component 112 is located inside the grouting single tube 110, the pipeline component 112 is used to transport grouting slurry, and several groups of supporting components 113 are respectively located on the outer wall of the grouting single tube 110, and the several groups of supporting components 113 are used to support and fix the grouting single tube 110.

[0065] Specifically, Figure 6 As shown, the pipeline assembly 112 includes a high-concentration pipeline 112-1 and a low-concentration pipeline 112-2. The high-concentration pipeline 112-1 is used to transport high-concentration concrete slurry, and the low-concentration pipeline 112-2 is used to transport low-concentration mud. In the technical solution of the present invention, low-concentration mud grouting is first performed through the low-concentration pipeline 112-2 to fill smaller rock formation gaps that are difficult for higher-concentration concrete slurries to enter, while solidifying ore fragments and rock formations. After the low-concentration mud grouting is completed through the low-concentration pipeline 112-2, high-concentration concrete slurry grouting is performed through the high-concentration pipeline 112-1 to further form a solid filling body.

[0066] Specifically, a plurality of mounting grooves 112-3 are provided on the inner wall of the high concentration pipe 112-1, and a plurality of stirring components 112-4 are fixedly installed in the plurality of mounting grooves 112-3. Figure 7 and Figure 8As shown, several groups of stirring components 112-4 respectively include a mounting shaft 112-41 and several groups of stirring blades 112-42. The mounting shaft 112-41 is fixedly installed inside the mounting groove 112-3. Several groups of stirring blades 112-42 are respectively rotatably installed on the mounting shaft 112-41, and several groups of stirring blades 112-42 can rotate freely on the mounting shaft 112-41. Therefore, they can be driven to rotate by utilizing the impact force generated by the grouting slurry during grouting, which can produce a certain stirring effect on the grouting slurry.

[0067] Specifically, Fig. 9 As shown, several groups of support assemblies 113 respectively include an upper slider 113-1, a lower slider 113-2 and two groups of support plates 113-3. The upper slider 113-1 is slidably installed on the upper end of the grouting single tube 110, and the lower slider 113-2 is slidably installed on the lower end of the grouting single tube 110. The two groups of support plates 113-3 are respectively located in the middle of the upper slider 113-1 and the lower slider 113-2. A first connecting shaft 113-4 is respectively provided between the upper slider 113-1 and the lower slider 113-2 and the two groups of support plates 113-3, and they are rotatably connected through the first connecting shaft 113-4. A second connecting shaft 113-5 is provided between the two groups of support plates 113-3, and they are rotatably connected through the second connecting shaft 113-5.

[0068] Specifically, the upper slider 113-1 and the lower slider 113-2 are both provided with a built-in power supply and a driving motor to control the upper slider 113-1 and the lower slider 113-2 to slide. Fig.10 As shown, the sliding of the upper slider 113-1 and the lower slider 113-2 can drive the support plate 113-3 to rotate and expand outward through the first connecting shaft 113-4 and the second connecting shaft 113-5, and the support plate 113-3 contacts the inner wall of the borehole to support the grouting pipe 100.

[0069] Specific working principle: When the overburden separation grouting process for coal mining in this embodiment is specifically implemented, the position of the key layer is first determined by combining on-site measurement and theoretical calculation, the drilling position and the drilling spacing are determined according to the slurry concentration and the grouting pressure, and the grouting drilling is completed; the slurry making and stirring equipment, high-pressure pump and grouting pipeline 100 required for grouting are installed according to the drilling position, and according to the drilling depth, a suitable number of grouting single tubes 110 are selected, and the grouting single tubes 110 are installed in combination; after the slurry making and stirring equipment, the high-pressure pump and the grouting pipeline 100 are installed, the upper slider 113-1 and the lower slider 113-2 on the grouting single tube 110 are respectively controlled to move downward and upward The upper slider 113-1 and the lower slider 113-2 drive the support plate 113-3 to expand outward, and the support plate 113-3 contacts the inner wall of the borehole to support the grouting pipe 100; after the grouting pipe 100 is fixed, low-concentration mud is first injected through the low-concentration pipe 112-2 to fill the smaller rock formation gaps and solidify the ore fragments and rock formations; after the low-concentration mud is injected through the low-concentration pipe 112-2, high-concentration concrete slurry is injected through the high-concentration pipe 112-1 to form a solid filling body; after the grouting is completed, the slurry mixing equipment, the high-pressure pump and the grouting pipe 100 are disassembled and transferred to the next borehole for subsequent grouting process.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A grouting process for overburden separation for coal mining, characterized in that: The specific steps include:

1. Preparation stage: S1. Measure drilling holes: The position of the key layer is determined by combining on-site measurement and theoretical calculation, the drilling position and drilling spacing are determined according to the slurry concentration and grouting pressure, and the grouting drilling is completed; S2. Equipment installation: Install the grouting mixing equipment, high-pressure pump and grouting pipes required for grouting according to the drilling position, select the appropriate number of grouting pipes according to the drilling depth, and install the grouting pipes in combination; S3. Pipeline fixing: After the slurry mixing equipment, high-pressure pump and grouting pipeline are installed, the upper slider and the lower slider on the grouting single pipe are controlled to move downward and upward respectively, and the upper slider and the lower slider drive the support plate to expand outward, and the support plate contacts the inner wall of the borehole to complete the support of the grouting pipeline; 2. Grouting stage: S4, Grouting 1: After the grouting pipe is fixed, low-concentration mud is first injected through the low-concentration pipe to fill the smaller rock gaps and solidify the ore fragments and rock formations; S5, Grouting 2: After low-concentration mud grouting is completed through the low-concentration pipeline, high-concentration concrete slurry grouting is then carried out through the high-concentration pipeline to form a solid filling body; A plurality of mounting grooves are provided on the inner wall of the high-concentration pipeline, and a plurality of stirring assemblies are fixedly installed inside the plurality of mounting grooves, and the plurality of stirring assemblies respectively include mounting shafts and a plurality of stirring blades, the mounting shafts are fixedly installed inside the mounting grooves, and the plurality of stirring blades are rotatably installed on the mounting shafts; 3. Closing stage: S6. Disassembly: After the grouting is completed, the slurry mixing equipment, high-pressure pump and grouting pipeline will be dismantled and transferred to the next drilling site for subsequent grouting process.

2. The overburden separation grouting process for coal mining according to claim 1, characterized in that: The grouting pipeline includes several groups of grouting single tubes, and the several groups of grouting single tubes respectively include two groups of connecting components, a pipeline component and several groups of supporting components. The two groups of connecting components are respectively located at the two ends of the grouting single tubes, and the connecting components are used to connect the several groups of grouting single tubes. The pipeline component is located inside the grouting single tubes, and the pipeline component is used to transport grouting slurry. The several groups of supporting components are respectively located on the outer walls of the grouting single tubes, and the several groups of supporting components are used to support and fix the grouting single tubes.

3. The overburden separation grouting process for coal mining according to claim 2, characterized in that: The pipeline assembly comprises a high-concentration pipeline and a low-concentration pipeline, wherein the high-concentration pipeline is used to transport high-concentration concrete slurry, and the low-concentration pipeline is used to transport low-concentration mud.

4. The overburden separation grouting process for coal mining according to claim 2, characterized in that: Several groups of the support assemblies respectively include an upper slider, a lower slider and two groups of support plates. The upper slider is slidably installed on the upper end of the grouting single tube, and the lower slider is slidably installed on the lower end of the grouting single tube. The two groups of support plates are respectively located in the middle of the upper slider and the lower slider. A first connecting shaft is respectively provided between the upper slider and the lower slider and the two groups of support plates, and they are rotatably connected through the first connecting shaft. A second connecting shaft is provided between the two groups of support plates, and they are rotatably connected through the second connecting shaft.

5. The overburden separation grouting process for coal mining according to claim 4, characterized in that: The upper slider and the lower slider are both provided with a built-in power supply and a driving motor inside to control the upper slider and the lower slider to slide.

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