Underground working face drilling water outlet grouting plugging device

Abstract

The utility model discloses an underground working face drilling water outlet grouting plugging device which comprises a drilling rod and a bag, and the interior of the drilling rod is hollow and located in a drilling hole; the bag is bundled on the outer side of the drill rod, the bag and the drill rod are fixed through a welding steel ring, the bag is filled with an expansion material, and a grouting opening used for grouting is reserved in the bag. Under the condition that a casing pipe is not arranged, the bag is used for fixing the drill rod, the bag is filled with the expansion material, the bag is placed in the drill hole, then grouting is conducted on the bag, the bag expands to block the inner wall of the drill hole at the moment, after the device is used, no water leaks around the hole opening of the drill hole, and grout leakage of cracks of the side portion of a roadway on the outer side also stops; therefore, the problem of abnormal water outlet grouting plugging in the working face drilling construction process is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of underground water control in coal mines, and particularly relates to a grouting plugging device for water gushing from boreholes in underground working faces. Background Technique

[0002] Coal mine water disasters are one of the main safety disasters in the process of mine construction and production. Their destructiveness is huge, bringing great potential safety hazards and losses to the safe production of coal mines. In terms of the sudden water sources of the main mine water disasters, the goaf has become the main sudden water source. Followed by karst aquifer water, and the proportion of other types of water sources is relatively small.

[0003] Through water outlet analysis, it is determined that the water source comes from the accumulated water in the goaf. The water gushing from the roadway behind the drill site seeps out through the cracks in the borehole, but the specific position of the water gushing crack in the borehole is not determined. The water gushing volume of the roadway behind the drill site is large. Normally, cement-sodium silicate grouting is used, but the water flow will wash away the grout and it is impossible to plug the borehole. This is also the key and difficult point of borehole grouting water plugging. When various boreholes are constructed in the working face, encountering internal hidden point water-conducting structures (such as collapse columns, poorly sealed boreholes, etc.) and water-conducting fracture zones induced by mining disturbances in the roof and floor, if the water gushing from the borehole is not plugged in time, it will affect the mining replacement of the working face and also bring a huge impact on the safe production of the mine.

[0004] With the increasing attention of the mining area to water disaster prevention, the exploration and prediction of hydrogeological conditions are more accurate, and the water disaster prevention technology is more mature. Among them, grouting plugging is also the most effective method for plugging borehole water gushing. The existing grouting technologies are all to pre-bury the grouting orifice pipe in advance and grout into the hole through the grouting orifice pipe. During the construction of the roof-to-floor gas drainage borehole in the working face, water suddenly gushes out. Therefore, the grouting orifice pipe is not pre-buried. In addition, the water gushing volume in the water hole is large, and it is also impossible to bury the grouting orifice pipe well later. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is: how to provide a grouting plugging device for water gushing from boreholes in underground working faces.

[0006] To solve the above technical problems, the utility model provides the following technical solutions:

[0007] A grouting plugging device for water gushing from boreholes in underground working faces, comprising:

[0008] A drill pipe, the inside of the drill pipe is hollow and is located inside the borehole;

[0009] A bladder, the bladder is tied outside the drill pipe, and the bladder and the drill pipe are fixed by welding steel rings. The inside of the bladder is filled with an expansion material, and a grouting port for grouting is reserved on the bladder.

[0010] In the case of no casing being installed, the drill pipe is first fixed by a bladder bag, and an expansion material is filled inside the bladder bag. Then it is placed in the borehole, and the bladder bag is grouted. At this time, the bladder bag expands to seal the inner wall of the borehole. After using this application, there is no water leakage around the borehole opening, and the slurry leakage from the cracks in the outer roadway rib also stops, thus solving the problem of abnormal water inflow grouting and plugging during the drilling construction of the working face.

[0011] As a further solution of the utility model: the bladder bag after filling the expansion material and grouting is closely attached to the inner wall of the borehole.

[0012] As a further solution of the utility model: the expansion material is mung beans, sawdust or aggregate.

[0013] As a further solution of the utility model: the bladder bag is made of rubber material.

[0014] As a further solution of the utility model: both ends of the drill pipe are respectively provided with a first drill pipe connector and a second drill pipe connector, and a drill pipe inner hole is horizontally opened inside the drill pipe.

[0015] As a further solution of the utility model: the water-cement ratio of the slurry is 1:1.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] In the case of no casing being installed, the drill pipe is first fixed by a bladder bag, and an expansion material is filled inside the bladder bag. Then it is placed in the borehole, and the bladder bag is grouted. At this time, the bladder bag expands to seal the inner wall of the borehole. After using this application, there is no water leakage around the borehole opening, and the slurry leakage from the cracks in the outer roadway rib also stops, thus solving the problem of abnormal water inflow grouting and plugging during the drilling construction of the working face;

[0018] This application solves the problem that in the case of water inflow, using a drill pipe and a special grouting device, according to the specific mine hydrogeological conditions and the types and characteristics of water hazards, a pre-prepared low-permeability slurry or aggregate is injected into the aquifer, roadway or outburst (water) outlet, etc., and is solidified with the surrounding rock to form an impermeable (or slightly permeable), integral body with a certain strength, so as to block the water passage, fill the water-conducting voids, reduce the permeability of the injected rock mass, increase the rock strength and play the role of water isolation (blocking). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of a device for plugging water inflow during drilling in an underground working face according to an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a device for plugging water inflow during drilling in an underground working face according to an embodiment of the utility model;

[0021] Description of the reference numerals:

[0022] 1. Boring hole;

[0023] 2. Drill pipe; 201. Inner hole of the drill pipe; 202. First connector of the drill pipe; 203. Second connector of the drill pipe;

[0024] 3. Bladder; 301. Expanding material; 302. Grouting port;

[0025] 4. Welded steel ring. Specific implementation manners

[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without any creative efforts shall fall within the protection scope of the present utility model.

[0027] Referring to Figure 1 and Figure 2 , a downhole working face borehole water outlet grouting plugging device includes a drill pipe 2, a bladder 3 and a welded steel ring 4. The bladder 3 is tied to the outside of the drill pipe 2, and at the tying position between the two, the welded steel ring 4 is used to fasten the two. After tying the bladder 3, the drill pipe 2 is placed into the borehole through a drilling rig.

[0028] Referring to Figure 1 , the inside of the drill pipe 2 is hollow, with an inner hole 201 of the drill pipe opened inside. Drill pipe first connectors 202 and drill pipe second connectors 203 are provided at both ends thereof. When the drilling rig drives the drill pipe 2 to move into the borehole, it can be driven by connecting the first connector 202 or the second connector 203. The inner hole 201 of the drill pipe opened inside can be used for subsequent grouting.

[0029] Referring to Figure 1 and Figure 2 , the bladder 3 is made of rubber material. It is sleeved on the outside of the drill pipe 2 and tied to the drill pipe 2 at both ends with the welded steel ring 4 to ensure the sealing between the bladder 3 and the drill pipe 2. Mung beans or sawdust or aggregates can be filled inside the bladder 3 as the expanding material, and this filling can be operated using an aggregate feeder.

[0030] Furthermore, a grouting port 302 is opened on the bladder 3 for connecting a grouting pipeline for internal grouting. The water-cement ratio of the grout is 1:1. After the grout is injected, the bladder 3 expands to seal the inner wall of the borehole, thereby closing the water outlet on the inner wall of the borehole to solve the problem of water inflow from the working face borehole.

[0031] The specific operation principle of this application is as follows:

[0032] Water plugging plan: Currently, according to the water inflow from the construction borehole and the roadway side, first use an aggregate injector to inject mung beans, sawdust, and aggregates, and then inject them into the bladder 3 to block the water outflow fissures in the borehole. Then, inject cement slurry into the bladder 3 and the borehole to block the borehole. Before the end of grouting, double-fluid slurry is used for bottom reinforcement to block the borehole; specifically:

[0033] (1) All the drill pipes in the borehole are lifted out. Immediately after the lifting is completed, a plugging drill pipe with two 2m-long (the length here is for reference only, and this length can be determined according to the actual length and position of the borehole. This application does not make a limitation and should not be construed as a limitation of this application) bladders filled with mung beans as expansion materials is lowered. To prevent hydraulic scouring from causing the bladder 3 to slip down, steel rings 4 are welded to both ends of the drill pipe 2.

[0034] (2) When the drill pipe 2 is lowered by 5m (the length here is for reference only, and this length can be determined according to the actual length and position of the borehole. This application does not make a limitation and should not be construed as a limitation of this application), the water inflow from the fissures in the roadway side outside the drill site begins to rapidly decay. When it is lowered by 7m, the fissures in the roadway side stop discharging water. When the drill pipe is lowered by 10m, drilling stops. There is no water in the fissures on the side, and water flows out 1.5m around the borehole opening 3 / h, and water flows out 20m in the middle of the drill pipe 3 / h. The above process of lowering the plugging drill pipe shows that the development depth of the inner fissures of the borehole is at the position of 5m deep from the borehole depth;

[0035] (3) Grout the bladder 3, and the water flow around the borehole opening is reduced to 1m 3 or less. Then, directly use the drill pipe 2 to inject single-fluid slurry to block the borehole. The grouting pressure is 1 - 1.5MPa, and the water-cement ratio of the slurry is 1:1. At the beginning, there is a small amount of slurry leakage around the borehole opening. After two minutes, the slurry leakage around the borehole opening stops, but the fissures in the roadway side outside the drill site start to leak slurry, and the slurry leakage volume is about 3m 3 / h, and the slurry is thick. Increase the slurry concentration and continue grouting. The fissures in the outer roadway side continue to leak slurry. After 20 minutes, the fissures in the outer roadway side stop leaking slurry. There is no water leakage or seepage around the borehole opening.

[0036] (4) When the grouting pressure is 2 - 2.5 MPa, water glass is added to inject double-fluid grout. During grouting, there is no water seepage or grout leakage around the drilling hole, and there is also no water seepage or grout leakage in the cracks on the sidewall of the outer roadway. The pressure relief gate valve at the end of the drill pipe is opened, the inside of the drill pipe has been completely blocked, and the double-fluid grout has solidified, and no more grout comes out.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and 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 various embodiments of the present invention.

Claims

1. A water grouting plugging device for drilling holes on an underground working face, characterized in that: include: A drill rod (2), the drill rod (2) being hollow inside and located inside the borehole; The bladder bag (3) is bundled on the outside of the drill rod (2), and the bladder bag (3) and the drill rod (2) are fixed by a welded steel ring (4). The interior of the bladder bag (3) is filled with expansion material (301), and a grouting port (302) for grouting is reserved on the bladder bag (3).

2. The underground working face drilling water grouting plugging device according to claim 1, characterized in that: The bag (3) filled with expansion material (301) and grouted is closely attached to the inner wall of the drill hole.

3. The underground working face drilling water grouting plugging device according to claim 1, characterized in that: The expansion material (301) is mung bean, sawdust or aggregate.

4. The underground working face drilling water grouting plugging device according to claim 1, characterized in that: The bladder bag (3) is made of rubber material.

5. The underground working face drilling water grouting plugging device according to claim 1, characterized in that: A first drill rod connector (202) and a second drill rod connector (203) are respectively provided at both ends of the drill rod (2), wherein a drill rod inner hole (201) is opened in the horizontal direction inside the drill rod (2).

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