CN211008565U - Hydraulic joint cutting pressure relief device for coal mine tunnel broken surrounding rock roof - Google Patents
Hydraulic joint cutting pressure relief device for coal mine tunnel broken surrounding rock roof Download PDFInfo
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- CN211008565U CN211008565U CN201922063580.XU CN201922063580U CN211008565U CN 211008565 U CN211008565 U CN 211008565U CN 201922063580 U CN201922063580 U CN 201922063580U CN 211008565 U CN211008565 U CN 211008565U
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Abstract
The utility model relates to a mine tunnel engineering stability control technical field discloses a broken country rock roof water conservancy joint-cutting release device in coal mine tunnel, include: the drilling structure is used for obliquely drilling holes from a top plate of the roadway to surrounding rocks above the roadway to form grouting fracturing holes; the grouting structure is arranged in the roadway and injects slurry into a fracture development area of a top plate above the roadway through the grouting fracturing holes so as to bond broken surrounding rocks in the fracture development area into a whole; and the hydraulic fracturing pressure relief structure is arranged in the roadway and can extend into the grouting fracturing hole, and fracturing is carried out along the axial direction of the grouting fracturing hole so as to form a crack capable of cutting off the roof rock. This broken country rock roof hydraulic joint-cutting pressure relief device in coal mine tunnel has the advantage that effectively avoids taking place the drilling before carrying out hydraulic fracturing and collapses.
Description
Technical Field
The utility model relates to a mine tunnel engineering stability control technical field especially relates to a broken country rock roof water conservancy joint-cutting release in coal mine tunnel.
Background
The mine tunnel, especially the stoping tunnel, is an underground passage for ensuring the safe and efficient mining of the coal mine, and whether the surrounding rock is stable or not is closely related to the safe and efficient mining of the coal mine.
The grouting is used for roadway surrounding rock, so that dense filling can be performed on roadway surrounding rock cracks, and the effect of reinforcing broken surrounding rock is achieved. The hydraulic prefabricated crack of the roadway roof can cut off the roof rock stratum to enable the roof rock stratum to lose the effect of transmission force, and then the roof pressure is removed to play a role in stably controlling the surrounding rock of the roadway on the lower portion of the roof rock stratum.
Besides the mining use of the working face, part of the stoping roadway can be reserved as the stoping roadway of the next working face. Therefore, the stoping roadway is affected by two mining operations on the working face, high stress concentration areas are formed above the roadway coal pillars and the solid coal, namely A gamma H and B gamma H (A > 1; B >1), and the surrounding rocks of the roadway are affected by the high stress concentration areas A gamma H and B gamma H, so that the phenomena of serious deformation and damage, namely serious roof sinking, rib spalling and bottom heaving, are caused, as shown in figure 1.
Due to the serious deformation and damage of the stoping roadway, the safe and efficient production of a working face is seriously restricted. At this time, people often prefabricate cracks on the top plate above the working face by means of a hydraulic fracture prefabricating method, so that the effect of the transmission force of the top plate is lost, and further, the high stress areas A gamma H and B gamma H of the top plate are reduced to A 'gamma H and B' gamma H (A '< A; B' < B), so that the deformation and the damage of the surrounding rock of the stoping roadway are greatly reduced, as shown in figure 2.
One key step of the hydraulic pre-crack technology is as follows: and (4) drilling hydraulic fracturing holes to the top plate in the stoping roadway, and ensuring that the holes are complete and do not collapse. Because the stoping roadway can be excavated in advance of the working face, the stoping roadway is often excavated several months or even longer in advance. Under the influence of the properties of surrounding rocks and high ground stress, the cracks of the surrounding rocks of the roadway are inevitably developed to form a crack development area. When a hydraulic fracturing borehole is drilled with a roof strata fracture development area, the phenomenon of borehole collapse and plugging often occurs without having time to perform hydraulic fracturing on a prefabricated fracture, as shown in fig. 3.
Along with the collapse of hydraulic fracturing drilling hole, the hydraulic prefabricated fracture work can be interrupted, the drilling hole has to be repaired, the construction progress and the pressure relief quality can be seriously influenced, the investment of manpower, material resources and financial resources can be increased, and the production cost is greatly increased.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model aims at providing a broken country rock roof water conservancy joint-cutting release device in colliery tunnel to receive country rock nature and high ground stress influence among the solution prior art, the tunnel country rock crack is inevitable to be developed and is formed the crack development district, after the roof rock stratum crack development district was beaten to hydraulic fracturing drilling, often not yet reached and carried out the hydraulic fracturing and prefabricated the crack and just appeared the phenomenon that the shutoff was collapsed in the drilling, thereby seriously influence the technical problem of construction progress and release quality.
(II) technical scheme
In order to solve the technical problem, according to the utility model provides a broken country rock roof water conservancy joint-cutting pressure relief device in coal mine tunnel, include: the drilling structure is used for obliquely drilling holes from a top plate of the roadway to surrounding rocks above the roadway to form grouting fracturing holes; the grouting structure is arranged in the roadway and injects slurry into a fracture development area of a top plate above the roadway through the grouting fracturing holes so as to bond broken surrounding rocks in the fracture development area into a whole; and the hydraulic fracturing pressure relief structure is arranged in the roadway, can extend into the grouting fracturing hole, and performs fracturing along the axial direction of the grouting fracturing hole to form a crack capable of cutting off the top plate.
Wherein, the slip casting structure is including setting up slip casting pump in the tunnel and with the slip casting pump is connected and can stretch into the downthehole slip casting pipe of slip casting fracturing.
The grouting structure further comprises a grouting drilling stopper arranged in the grouting fracturing hole and close to the end part of the roadway.
The grouting pipe comprises a first section of grouting pipe connected with an outlet of the grouting pump and a second section of grouting pipe which is in butt joint communication with the first section of grouting pipe and can extend into the grouting fracturing hole, wherein the second section of grouting pipe penetrates through the grouting drilling stopper.
The hydraulic fracturing pressure relief structure comprises a pressurizing water pump arranged in the roadway and a water pipe group which is connected with the pressurizing water pump and can extend into the grouting fracturing hole.
The hydraulic fracturing pressure relief structure further comprises an upper hydraulic fracturing hole packer and a lower hydraulic fracturing hole packer which are arranged in the grouting fracturing hole, wherein the upper hydraulic fracturing hole packer and the lower hydraulic fracturing hole packer are arranged at intervals along the axial direction of the grouting fracturing hole.
The water pipe group comprises a first water pipe and a second water pipe which are arranged in the grouting fracturing hole and are arranged at intervals, wherein the first end of the first water pipe is connected with the pressurizing water pump, the second end of the first water pipe penetrates through the lower hydraulic fracturing hole packer and extends into the upper hydraulic fracturing hole packer, and a water outlet hole is formed in the end part, corresponding to the upper hydraulic fracturing hole packer, of the first water pipe; and the first end of the second water pipe is connected with the pressurized water pump, and the second end of the second water pipe penetrates through the lower hydraulic fracturing hole packer and is positioned between the lower hydraulic fracturing hole packer and the upper hydraulic fracturing hole packer.
The grouting fracturing holes comprise grouting holes and hydraulic fracturing holes, wherein the grouting holes are coincided with the center lines of the hydraulic fracturing holes.
(III) advantageous effects
The utility model provides a broken country rock roof water conservancy joint-cutting release device in coal mine tunnel compares with prior art, has following advantage:
this application is through constructing the slip casting fracturing hole earlier, through this slip casting fracturing hole to the roof crack development zone injection thick liquid of tunnel top to make broken country rock in the crack development zone bond as an organic wholely, follow the axial in this slip casting fracturing hole and carry out the fracturing, in order to form the crack that can cut off this roof. It can be seen that this application consolidates the broken country rock in the crack development zone of the top in tunnel through adopting slip casting earlier, then continues the construction fracturing through slip casting fracturing hole, has overcome the defect that traditional hydraulic fracturing roof device fracturing drilling is large-scale to collapse when fracturing roof rock stratum. The stability of hydraulic fracturing drilling can be greatly improved, and the success rate of hydraulic prefabrication cracks is greatly increased. Therefore, the roof cutting and pressure relief effect is ensured, and the investment of repairing and drilling is greatly reduced.
Drawings
FIG. 1 is a schematic view of a mining roadway deforming failure under high stress in the prior art;
FIG. 2 is a schematic view of a reduction in deformation of a stoping roadway after a crack is preformed in a roof in the prior art;
FIG. 3 is a schematic diagram of hydraulic fracturing borehole collapse in a fracture development zone in the prior art;
fig. 4 is a schematic structural diagram of grouting of the hydraulic joint-cutting pressure relief device for the roof of the coal mine tunnel broken surrounding rock of the embodiment of the invention;
fig. 5 is a schematic structural view of a hydraulic joint cutting pressure relief device for a coal mine tunnel broken surrounding rock roof for hydraulic fracturing and crack formation;
fig. 6 is the utility model discloses a broken country rock roof water conservancy joint-cutting pressure relief device's in coal mine tunnel pressure relief step flow schematic diagram.
Reference numerals:
1: drilling a hole structure; 200: a roadway; 201: a top wall; 202: a top plate; 20: grouting and fracturing holes; 20 a: grouting holes; 20 b: hydraulic fracturing holes; 2: grouting structure; 21: grouting pump; 22: a grouting pipe; 221: a first section of grouting pipe; 222: a second section of grouting pipe; 23: grouting a drilling plugging device; 203: crushing surrounding rocks; 3: a hydraulic fracturing pressure relief structure; 31: a pressurized water pump; 32: a water pipe group; 321: a first water pipe; 322: a second water pipe; 33: hydraulic fracturing hole packer; 34: a hydraulic fracturing hole packer is arranged; 4: and (4) cracking.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Fig. 1 to fig. 3 are drawings in the prior art, and the drawings and the illustration content of the parts have been described in the background of the present invention, and are not described in detail here to avoid redundancy.
As shown in fig. 4 to 5, the hydraulic joint cutting and pressure relief device for the roof of the broken surrounding rock of the coal mine roadway is schematically shown to comprise a drilling structure 1, a grouting structure 2 and a hydraulic fracturing pressure relief structure 3.
In an embodiment of the present application, the borehole structure 1 is used to perforate diagonally from a top wall 201 of the roadway 200 towards a roof 202 above the roadway 200 to form the grout fracturing hole 20.
The grouting structure 2 is arranged in the roadway 200 and injects slurry to a fracture development area of the roof 202 above the roadway 200 through the grouting fracturing holes 20, so that broken surrounding rocks 203 in the fracture development area are bonded into a whole.
The hydraulic fracturing pressure relief structure 3 is arranged in the roadway 200 and can extend into the grouting fracturing hole 20 to perform fracturing along the axial direction of the grouting fracturing hole 20 so as to form a crack 4 capable of cutting off the top plate 202. Specifically, the present application constructs a grouting fracturing hole 20, injects slurry into a fracture development area of a roof 202 above a roadway 200 through the grouting fracturing hole 20, so that broken surrounding rocks 203 in the fracture development area are bonded together, and fractures along the axial direction of the grouting fracturing hole 20 to form a fracture 4 capable of cutting off the roof 202. It can be seen that this application consolidates broken country rock 203 in the crack development zone of the top of tunnel 200 through adopting slip casting earlier, then continues construction fracturing through slip casting fracturing hole 20, has overcome the defect that the fracture drilling collapses on a large scale when fracturing the roof rock stratum of traditional hydraulic fracturing roof device. The stability of hydraulic fracturing drilling can be greatly improved, and the success rate of hydraulic prefabrication cracks is greatly increased. Therefore, the roof cutting and pressure relief effect is ensured, and the investment of repairing and drilling is greatly reduced.
In one embodiment of the application, the drilling structure 1 may be a surrounding rock drilling machine or other structure with a drilling function.
In one embodiment of the present application, the grouting structure 2 includes a grouting pump 21 disposed in the roadway 200 and a grouting pipe 22 connected to the grouting pump 21 and capable of extending into the grouting fracturing hole 20. Under the action of power provided by the grouting pump 21, grout is injected into the broken surrounding rocks 203 in the fracture development area through the grouting pipe 22 through the grouting fracturing holes 20, and after the gaps between the broken surrounding rocks 203 in the fracture development area are filled with the grout, the broken surrounding rocks 203 in the fracture development area can be bonded into a whole.
In a preferred embodiment of the present application, the grouting structure 2 further comprises a grouting bore stopper 23 disposed in the grouting fracturing hole 20 near the end of the roadway 200. Specifically, the purpose of the grouting drilling stopper 23 is to effectively block the end of the grouting fracturing hole 20 close to the roadway 200, so as to prevent the slurry from flowing into the roadway 200 under the action of the gravity of the liquid when the slurry is injected into the grouting fracturing hole 20, and further prevent the slurry from blocking the roadway 200.
As shown in fig. 4, in a preferred embodiment of the present application, the grouting pipe 22 includes a first section of grouting pipe 221 connected to the outlet of the grouting pump 21 and a second section of grouting pipe 222 in butt communication with the first section of grouting pipe 221 and capable of extending into the grouting fracturing hole 20, wherein the second section of grouting pipe 222 passes through the grouting bore stopper 23. Specifically, the first section of grouting pipe 221 is disposed in the roadway 200 and located outside the grouting fracturing hole 20, the second section of grouting pipe 222 is disposed in the grouting fracturing hole 20, after grouting is completed, the second section of grouting pipe 222 and the first section of grouting pipe 221 are separated from each other, and the second section of grouting pipe 222 is embedded in the grouting fracturing hole 20 along with grout.
It should be noted that, in order to ensure the sealing performance of the connection portion between the first section grouting pipe 221 and the second section grouting pipe 222, the end portion of the second section grouting pipe 222 close to the first section grouting pipe 221 can be inserted into the first section grouting pipe 221 for a certain length, so that the slurry leakage can be avoided.
In one embodiment of the present application, the grouting drilling stopper 23 is similar to a hollow rubber plug, and is integrally embedded in the grouting fracturing hole 20 in a wedge shape, so as to prevent slurry leakage.
As shown in fig. 5, in one embodiment of the present application, the hydraulic fracture pressure relief structure 3 includes a pressurized water pump 31 disposed in the roadway 200 and a water pipe set 32 connected to the pressurized water pump 31 and capable of extending into the grouting fracturing hole 20. Specifically, under the action of the pressurized water pump 31, the water in the water pipe group 32 is provided with flowing power, so that the water with a certain pressure in the water pipe group 32 can smoothly flow into the grouting fracturing hole 20 to complete fracturing on the grouting fracturing hole 20, and thus, a crack 4 capable of cutting off the top plate 202 is generated on the top plate 202 above the roadway 200.
In one embodiment of the present application, as shown in fig. 5, the hydraulic fracture pressure relief structure 3 further comprises an upper hydraulic fracture packer 33 and a lower hydraulic fracture packer 34 arranged in the grouting fracture hole 20, wherein the upper hydraulic fracture packer 33 and the lower hydraulic fracture packer 34 are arranged at intervals along the axial direction of the grouting fracture hole 20. Specifically, after grouting is completed, after the gaps between the broken surrounding rocks 203 in the fracture development area are filled with slurry, and after the broken surrounding rocks 203 in the fracture development area are bonded into a whole, the grouting fracturing hole 20 can be fractured, and before fracturing, the part of the grouting fracturing hole 20 far away from the roadway 200 needs to be plugged in advance by means of the upper hydraulic fracturing hole packer 33 and the lower hydraulic fracturing hole packer 34, and then water is injected into the plugging section, so that fracturing is realized. Then, the upper hydraulic fracturing hole packer 33 and the lower hydraulic fracturing hole packer 34 are gradually moved towards the direction close to the roadway 200 to perform fracturing again at a proper position, and the fracturing is sequentially repeated until the end part of the grouting fracturing hole 20 close to the roadway 200 is fractured completely, and then the fracturing is stopped.
It can be understood that in order to perform fracturing, a plurality of small holes need to be formed on the wall of the grouting fracturing hole 20, so as to perform fracturing on the part to be fractured on the grouting fracturing hole 20 under the action of internal hydraulic pressure.
In a preferred embodiment of the present application, as shown in fig. 5, the water pipe set 32 includes a first water pipe 321 and a second water pipe 322 which are arranged in the grouting fracturing hole 20 and are arranged at intervals, wherein a first end of the first water pipe 321 is connected to the pressurized water pump 31, a second end of the first water pipe 321 passes through the lower hydraulic fracturing hole packer 34 and extends into the upper hydraulic fracturing hole packer 33, and a water outlet hole is formed at an end of the first water pipe 321 corresponding to the upper hydraulic fracturing hole packer 33.
The first end of the second water pipe 322 is connected to the pressurized water pump 31, and the second end of the second water pipe 322 passes through the lower hydraulic fracture hole packer 34 and is located between the lower hydraulic fracture hole packer 34 and the upper hydraulic fracture hole packer 33. Specifically, a water outlet hole (not shown) is formed at the end of the first water pipe 321 corresponding to the hydraulic fracturing packer 33. Under the action of certain pressure, water is sprayed into the upper hydraulic fracturing hole packer 33 through the water outlet hole, so that under the action of water pressure, the upper hydraulic fracturing hole packer 33 expands along the radial direction, and the purpose of plugging the grouting fracturing hole 20 is achieved.
It should be noted that the pressurized water pump 31 can provide high pressure water of not less than 30MPa (megapascal), and the required power supply voltage is 660/1140V (volt) which is consistent with the downhole power supply high voltage.
The number of the water outlet holes can be multiple and are arranged at intervals along the circumferential direction of the first water pipe 321 corresponding to the end of the upper hydraulic fracturing hole packer 33.
By continuously discharging water from the end of the second water pipe 322 between the upper hydraulic fracturing packer 33 and the lower hydraulic fracturing packer 34, the fracturing of the grouting fracturing hole 20 can be realized along with the accumulation of the water pressure.
In one embodiment of the present application, the grout holes 20 include a grout hole 20a and a hydraulic fracture hole 20b, wherein the grout hole 20a coincides with a centerline of the hydraulic fracture hole 20 b. Specifically, after grouting is completed, the grouting holes 20a can be plugged, and when hydraulic fracturing is required, the hydraulic fracturing holes 20b can be drilled again at the positions of the grouting holes 20a, so that the drilling engineering amount can be greatly reduced, the construction procedures are reduced, and the drilling efficiency is improved.
As shown in fig. 6, the utility model discloses a broken country rock roof water conservancy joint-cutting pressure relief device in coal mine tunnel's concrete working process as follows:
in step S1, a grout hole 20a is drilled in the crack growth zone of the roof panel 202 above the roadway 200.
In step S2, the end of the grouting hole 20a near the roadway 200 is plugged and grouting is performed into the grouting hole 20 a. Specifically, the mixed slurry is poured into the grouting pump 21 and sufficiently stirred, and then the slurry is injected into the gaps of the broken surrounding rock 203 through the grouting pump 21 until all the gaps in the broken surrounding rock 203 are filled, and the grouting operation is stopped.
Step S3, after the broken surrounding rocks 203 in the fracture development area are filled with slurry and bonded into a whole, drilling hydraulic fracturing holes 20b at the positions, corresponding to the grouting holes 20a, of the top plate 202 above the roadway 200. The center line of the grouting hole 20a coincides with the center line of the hydraulic fracturing hole 20 b.
Step S4, the hydraulic fracturing hole 20b is fractured in the axial direction of the hydraulic fracturing hole 20b to form a fracture 4 cutting the roof 202 above the roadway 200. After the surrounding rock 203 to be broken is reinforced by grouting, the upper hydraulic fracturing hole packer 33 and the lower hydraulic fracturing hole packer 34 divide the hydraulic fracturing hole 20b into fracturing spaces, and then the pressurized water pump 31 is started to form point injection of high-pressure water through the first water pipe 321 and the second water pipe 322 so as to prefabricate the above-mentioned crack 4 on the hole wall.
In the case of fracturing the hydraulic fracturing hole 20b, the time for introducing high-pressure water is not less than 30 minutes.
And repeating the steps S1 to S4, and performing staged fracturing on the hydraulic fracturing hole 20b until all fracturing along the axial direction of the hydraulic fracturing hole 20b is completed, and stopping fracturing on the hydraulic fracturing hole 20 b.
In one embodiment of the present application, the depth of the grout hole 20a is adapted to the fracture development depth of the fractured surrounding rock 203 in the fracture development zone. Thus, it is possible to ensure that the slurry to be injected can be uniformly spread in the injection hole 20 a.
To sum up, the grouting fracturing hole 20 is constructed first, and slurry is injected into the fracture development area of the top plate 202 above the roadway 200 through the grouting fracturing hole 20, so that the broken surrounding rocks 203 in the fracture development area are bonded into a whole, and fracturing is performed along the axial direction of the grouting fracturing hole 20, so that the fracture 4 capable of cutting off the top plate 202 is formed. It can be seen that this application consolidates broken country rock 203 in the crack development zone of the top of tunnel 200 through adopting slip casting earlier, then continues construction fracturing through slip casting fracturing hole 20, has overcome the defect that the fracture drilling collapses on a large scale when fracturing the roof rock stratum of traditional hydraulic fracturing roof device. The stability of hydraulic fracturing drilling can be greatly improved, and the success rate of hydraulic prefabrication cracks is greatly increased. Therefore, the roof cutting and pressure relief effect is ensured, and the investment of repairing and drilling is greatly reduced.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a broken country rock roof water conservancy joint-cutting pressure relief device in coal mine tunnel which characterized in that includes:
the drilling structure is used for obliquely drilling holes from a top plate of the roadway to surrounding rocks above the roadway to form grouting fracturing holes;
the grouting structure is arranged in the roadway and injects slurry into a fracture development area of a top plate above the roadway through the grouting fracturing holes so as to bond broken surrounding rocks in the fracture development area into a whole; and
and the hydraulic fracturing pressure relief structure is arranged in the roadway and can extend into the grouting fracturing hole, and fracturing is carried out along the axial direction of the grouting fracturing hole so as to form a crack capable of cutting off the top plate.
2. The hydraulic joint cutting pressure relief device for the roof of the coal mine tunnel broken surrounding rock as claimed in claim 1, wherein the grouting structure comprises a grouting pump arranged in the tunnel and a grouting pipe connected with the grouting pump and capable of extending into the grouting fracturing hole.
3. The hydraulic joint cutting pressure relief device for the roof of the coal mine tunnel broken surrounding rock as claimed in claim 2, wherein the grouting structure further comprises a grouting drill hole plugging device arranged in the grouting fracturing hole and close to the end of the tunnel.
4. The hydraulic joint cutting pressure relief device for the roof of the coal mine tunnel broken surrounding rock as claimed in claim 3, wherein the grouting pipe comprises a first section of grouting pipe connected with the outlet of the grouting pump and a second section of grouting pipe in butt-joint communication with the first section of grouting pipe and capable of extending into the grouting fracturing hole, wherein the second section of grouting pipe penetrates through the grouting drilling stopper.
5. The hydraulic slitting and pressure relief device for the roof of the broken surrounding rock of the coal mine tunnel according to claim 1, wherein the hydraulic fracturing and pressure relief structure comprises a pressurized water pump arranged in the tunnel and a water pipe group connected with the pressurized water pump and capable of extending into the grouting fracturing hole.
6. The hydraulic slitting and pressure relief device for the roof of the broken surrounding rock of the coal mine tunnel according to claim 5, wherein the hydraulic fracturing pressure relief structure further comprises an upper hydraulic fracturing hole packer and a lower hydraulic fracturing hole packer which are arranged in the grouting fracturing hole, wherein the upper hydraulic fracturing hole packer and the lower hydraulic fracturing hole packer are arranged at intervals along the axial direction of the grouting fracturing hole.
7. The hydraulic joint cutting and pressure relief device for the roof of the broken surrounding rock of the coal mine tunnel according to claim 6, wherein the water pipe group comprises a first water pipe and a second water pipe which are arranged in the grouting fracturing hole in a spaced mode, wherein a first end of the first water pipe is connected with the pressurized water pump, a second end of the first water pipe penetrates through the lower hydraulic fracturing hole packer and extends into the upper hydraulic fracturing hole packer, and a water outlet hole is formed in the end portion, corresponding to the upper hydraulic fracturing hole packer, of the first water pipe;
and the first end of the second water pipe is connected with the pressurized water pump, and the second end of the second water pipe penetrates through the lower hydraulic fracturing hole packer and is positioned between the lower hydraulic fracturing hole packer and the upper hydraulic fracturing hole packer.
8. The hydraulic slitting and pressure relief device for the roof of the coal mine tunnel broken surrounding rock of claim 1, wherein the grouting fracturing holes comprise grouting holes and hydraulic fracturing holes, and the grouting holes are coincident with the center lines of the hydraulic fracturing holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922063580.XU CN211008565U (en) | 2019-11-26 | 2019-11-26 | Hydraulic joint cutting pressure relief device for coal mine tunnel broken surrounding rock roof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922063580.XU CN211008565U (en) | 2019-11-26 | 2019-11-26 | Hydraulic joint cutting pressure relief device for coal mine tunnel broken surrounding rock roof |
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| Publication Number | Publication Date |
|---|---|
| CN211008565U true CN211008565U (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922063580.XU Expired - Fee Related CN211008565U (en) | 2019-11-26 | 2019-11-26 | Hydraulic joint cutting pressure relief device for coal mine tunnel broken surrounding rock roof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417639A (en) * | 2021-07-28 | 2021-09-21 | 西安科技大学 | Hard coal seam water injection scour prevention method and system |
-
2019
- 2019-11-26 CN CN201922063580.XU patent/CN211008565U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417639A (en) * | 2021-07-28 | 2021-09-21 | 西安科技大学 | Hard coal seam water injection scour prevention method and system |
| CN113417639B (en) * | 2021-07-28 | 2023-10-20 | 西安科技大学 | Method and system for preventing water injection of hard coal seam from rushing |
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