Coal mine grouting packing device

Abstract

The utility model discloses a coal mine grouting packing device which comprises an inner pipe and an outer pipe arranged on the outer side of the inner pipe, sealing air bags are arranged on the outer side of the inner pipe and the outer side of the outer pipe, limiting blocks which are obliquely arranged are arranged on the inner wall of the outer pipe in the circumferential direction, limiting protrusions are arranged on the outer wall of the inner pipe, and limiting grooves matched with the limiting blocks are formed in the limiting protrusions. The limiting blocks can be screwed into the limiting grooves. According to the utility model, the limiting block is matched with the limiting groove, so that the inner pipe and the outer pipe can be fixed, and the inner pipe and the outer pipe which are originally connected with the hole wall of a grouting drill hole independently through an air bag are connected together, so that the supporting strength on grouting pressure is improved, and relative movement during grouting is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal mine grouting and sealing, more particularly to a coal mine grouting and sealing device. BACKGROUND

[0002] The current coal mine grouting pressure is generally lower than 4MPa. If high-pressure grouting is required, high sealing performance of the grouting borehole sealing device is required. The traditional method is to use air bags or water bags to seal the borehole, but the sealing capacity of air bags and water bags is limited, and it is difficult to withstand grouting pressure above 10MPa, and grouting leakage often occurs during high-pressure grouting. Another method is to inject quick-setting material into the grouting borehole orifice to seal the orifice before grouting, but the quick-setting material sealing length of conventional orifice sealing devices is fixed, and it is difficult to flexibly adjust the sealing area length according to the grouting pressure and geological conditions.

[0003] Nowadays, coal mine high-pressure grouting has the following problems:

[0004] 1) Difficulty in controlling grouting pressure. Grouting pressure is a key factor affecting grouting effect. Too high pressure may cause stratum rupture or material loss, while too low pressure may affect permeation effect. In actual engineering, grouting pressure needs to be adjusted according to geological conditions and material properties, but current technical means cannot achieve precise control;

[0005] 2) Poor sealing effect. Some grouting anchor rods and anchor cables have simple sealing devices, and the commonly used sealing plugs have low sealing pressure. Grouting leakage often occurs under small grouting pressure, which significantly affects the grouting diffusion range and grouting effect.

[0006] The patent document with the patent publication number CN 115263232 A discloses a coal mine underground gas extraction drilling automatic sealing device and extraction method, which comprises rear-end sleeve, middle sleeve and front-end sleeve connected in order from rear to front, wherein each sleeve forms double channels isolated from each other, the inner channels of each sleeve are in series communication with each other, and the outer channels of each sleeve are also in series communication with each other. The inner channel is a gas extraction channel, and the outer channel is a grouting channel. The outer side of the outer channel of the rear-end sleeve and the front-end sleeve is further provided with an inflatable capsule. The capsule expands to seal the gap between the rear-end sleeve and the front-end sleeve and the drilling hole. The outer channel of the rear-end sleeve and the front-end sleeve is in communication with the space of the capsule through a one-way valve. The outer channel of the rear-end sleeve is provided with a one-way valve in communication with the drilling hole. The outer tube size of each sleeve matches the size of the drill rod. The front-end sleeve, middle sleeve and rear-end sleeve are connected in order by using an automatic drilling machine, and the sleeves are sent into the drilling hole in order.

[0007] There is also a two-wall one-annular structure of inner and outer pipes cooperating with air bags in the prior art to achieve plugging of the hole wall, but due to the deep hole wall, the inner and outer pipes are only connected with the hole wall through the air bag part, and the inner and outer pipes are relatively moved under the grouting pressure, thereby limiting the sealing effect. Utility model content

[0008] The technical problem to be solved by the utility model is how to prevent the relative movement of the inner and outer pipes during grouting.

[0009] The utility model discloses a coal mine grouting packer which comprises an inner pipe, an outer pipe arranged on the outer side of the inner pipe, a sealing air bag arranged on the outer side of the inner pipe and the outer pipe, an inclined limiting block arranged on the inner wall of the outer pipe in a circumferential direction, a limiting protrusion arranged on the outer wall of the inner pipe, a limiting groove matched with the limiting block formed on the limiting protrusion, and the limiting block can be rotated into the limiting groove.

[0010] As a preferred technical scheme, a gap is left between the inner pipe and the outer pipe, and the limiting block and the limiting protrusion are located in the gap.

[0011] As a preferred technical scheme, at least one circle of limiting blocks arranged in an inclined manner is arranged on the inner wall of the outer pipe, and the single circle of limiting blocks comprises a plurality of limiting blocks distributed at equal angles.

[0012] As a preferred technical scheme, a front sealing air bag is fixedly connected to the outer side of the inner pipe, a rear sealing air bag is fixedly connected to the outer side of the outer pipe, and the plane of the rear sealing air bag located in the grouting borehole is below the plane of the front sealing air bag located in the grouting borehole.

[0013] As a preferred technical scheme, a quick-setting packer is injected into the area enclosed by the rear sealing air bag, the grouting borehole inner wall, the front sealing air bag, the outer pipe and the inner pipe.

[0014] As a preferred technical scheme, the axis of the inner pipe is coaxial with or different from the axis of the outer pipe.

[0015] As a preferred technical scheme, the limiting protrusion is arranged in an inclined manner.

[0016] As a preferred technical scheme, the cross section of the limiting block is in a trapezoidal shape.

[0017] As a preferred technical scheme, the multiple circles of limiting blocks are distributed at equal intervals along the axial direction of the inner pipe.

[0018] As a preferred technical scheme, the inner pipe and the outer pipe can move along the axial direction of the grouting borehole.

[0019] The utility model has the advantages that:

[0020] (1) The utility model discloses a cooperation of limiting block and limiting recess, can realize the fixation of inner tube and outer tube, connect the inner and outer tube of original separate through air bag and grouting drill hole hole wall connection together, improved the support strength to grouting pressure, thereby prevented the relative movement when grouting.

[0021] (2) The utility model discloses inject the quick -setting partition in the area formed by the rear sealed air bag and grouting drill hole inner wall, front sealed air bag, outer tube, inner tube enclose, and the quick -setting partition can provide further support to inner and outer tube structure after hardening.

[0022] (3) The utility model discloses inner tube and outer tube can move along grouting drill hole axis direction, can adjust the gap between inner tube and outer tube according to the grouting pressure of different area, thereby adapt to different grouting pressure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The utility model provides the grouting drill hole profile structure schematic drawing for embodiment;

[0024] Figure 2 The utility model provides the quick -setting partition structure schematic drawing for embodiment;

[0025] Figure 3 The utility model provides the high pressure slurry structure schematic drawing for embodiment;

[0026] Figure 4 The utility model provides the limiting convex structure schematic drawing for embodiment;

[0027] Figure 5 The utility model provides the limiting block structure schematic drawing for embodiment;

[0028] Figure 6 The utility model provides the recess structure schematic drawing for embodiment;

[0029] Figure number: 1, outer tube;2, rear sealed air bag;3, inner tube;4, front sealed air bag;5, orifice;6, grouting drill hole;7, quick -setting partition;8, high pressure slurry;9, recess;10, limiting block;11, limiting convex. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be described clearly and completely below, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of the utility model protection.

[0031] Referring to Figure 1 , Figure 6 , a coal mine grouting sealing device, comprising an inner tube 3 and an outer tube 1 sleeved outside the inner tube 3, the sleeving design is convenient for the installation and use of the sealing device, the outer side of the inner tube 3 and the outer tube 1 is provided with a sealing air bag, the outer side of the outer tube 1 is provided with a rear sealing air bag 2, the outer side of the inner tube 3 is provided with a front sealing air bag 4, the inner wall of the outer tube 1 is circumferentially provided with a limiting block 10 arranged obliquely, the outer wall of the inner tube 3 is provided with a limiting protrusion 11, the limiting protrusion 11 is formed with a limiting groove 9 arranged obliquely matched with the limiting block 10, the limiting block 10 can be screwed into the limiting groove 9, a gap is left between the inner tube 3 and the outer tube 1, and the limiting block 10 and the limiting protrusion 11 are located in the gap.

[0032] When the outer tube 1 is sleeved outside the inner tube 3, the limiting block 10 and the limiting protrusion 11 are arranged in a staggered manner, at this time, it is the first installation position, so as to facilitate the sleeving of the outer tube 1 to the outside of the inner tube 3, when the outer tube 1 and the inner tube 3 are both sent to the predetermined position in the grouting borehole 6, the outer tube 1 is first rotated relative to the inner tube 3, so as to screw the limiting block 10 on the inner wall of the outer tube 1 into the limiting groove 9 on the inner tube 3, until the end face of the limiting block 10 abuts against the end face of the limiting groove 9, at this time, it is the second installation position, which prevents the inner tube 3 and the outer tube 1 from moving in the axial direction, then the rear sealing air bag 2 and the front sealing air bag 4 are inflated, the rear sealing air bag 2 and the front sealing air bag 4 abut against the hole wall of the grouting borehole 6 respectively, the plane where the rear sealing air bag 2 is located in the grouting borehole 6 is below the plane where the front sealing air bag 4 is located in the grouting borehole 6, referring to Figure 3 , the front sealing air bag 4 prevents the high-pressure slurry 8 or gas from leaking from the front end, and the rear sealing air bag 2 prevents the slurry or gas from leaking from the rear end, at this time, the fixing between the inner tube 3 and the outer tube 1 is completed, and the fixing between the inner tube 3, the outer tube 1 and the hole wall of the grouting borehole 6 is also completed.

[0033] Referring to Figure 4 , Figure 5 , the inner wall of the outer tube 1 is circumferentially provided with at least one circle of limiting blocks 10 arranged obliquely, the cross section of the limiting block 10 is trapezoidal, a single circle of limiting blocks 10 comprises a plurality of limiting blocks 10 distributed at equal angles, in this embodiment, taking five circles as an example, each circle of limiting blocks 10 comprises ten limiting blocks 10, the five circles of limiting blocks 10 are distributed at equal intervals along the axial direction of the inner tube 3, of course, it can also be one circle, two circles, three circles, etc., and is not limited thereto.

[0034] Referring to Figure 2 , the area enclosed by the rear sealing air bag 2, the inner wall of the grouting borehole 6, the front sealing air bag 4, the outer tube 1 and the inner tube 3 is injected with a rapid-setting sealing piece 7, the rapid-setting sealing piece 7 can be commercially available epoxy resin or cement-based expansive agent, by injecting the rapid-setting sealing piece 7 into the area, after the rapid-setting sealing piece 7 hardens, it can increase the support between the inner tube 3 and the outer tube 1, at this time, the high-pressure slurry 8 can be injected into the grouting borehole 6 through the inner tube 3.

[0035] With reference to Figure 1 The inner tube 3 and the outer tube 1 can move along the axis direction of the grouting borehole 6, and the gap between the inner tube 3 and the outer tube 1 can be adjusted according to the grouting pressure of different regions, so as to adapt to different grouting pressures. In the embodiment, the axes of the inner tube 3 and the outer tube 1 are coaxial, and of course, they can be non-coaxial. The grouting borehole 6 is located at one end of the ground to form the orifice 5.

[0036] It should be noted that the packer in the embodiment is suitable for grouting and gas extraction borehole sealing in coal mine fissure strata, and is particularly suitable for use under complex geological conditions, such as grouting of broken coal and rock roadway surrounding rock.

[0037] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A coal mine grouting packer, comprising an inner tube and an outer tube arranged outside the inner tube, and a sealing air bag arranged outside the inner tube and the outer tube, characterized in that, The outer tube is provided with a plurality of limit blocks arranged in a tilt manner on the inner wall in the circumferential direction, and the inner tube is provided with a plurality of limit protrusions on the outer wall, and the limit protrusions are provided with limit grooves matched with the limit blocks.

2. The coal mine grouting packer of claim 1, wherein, The inner tube and the outer tube are provided with a gap therebetween, and the limit blocks and the limit protrusions are located in the gap.

3. The coal mine grouting packer of claim 1, wherein, The outer tube is provided with at least one circle of limit blocks arranged in a tilt manner on the inner wall in the circumferential direction, and the single circle of limit blocks comprises a plurality of limit blocks distributed at equal angles.

4. The coal mine grouting packer of claim 1, wherein, The inner tube is fixedly connected with a front sealing air bag on the outside, and the outer tube is fixedly connected with a rear sealing air bag on the outside, and the plane of the rear sealing air bag in the grouting borehole is below the plane of the front sealing air bag in the grouting borehole.

5. The coal mine grouting packer of claim 4, wherein, The rear sealing air bag, the inner wall of the grouting borehole, the front sealing air bag, the outer tube and the inner tube form a region in which a quick-setting sealing member is injected.

6. The coal mine grouting packer of claim 1, wherein, The inner tube and the outer tube are coaxial or non-coaxial.

7. The coal mine grouting packer of claim 1, wherein, The limit protrusions are arranged in a tilt manner.

8. The coal mine grouting packer of claim 1, wherein, The limit blocks are in a trapezoidal cross section.

9. The coal mine grouting packer of claim 3, wherein, The plurality of circles of limit blocks are distributed at equal intervals along the axial direction of the inner tube.

10. The coal mine grouting packer of claim 1, wherein, The inner tube and the outer tube can move along the axial direction of the grouting borehole.

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