CN114135296B - Grouting mechanism and continuous grouting method for rock mass - Google Patents
Grouting mechanism and continuous grouting method for rock mass Download PDFInfo
- Publication number
- CN114135296B CN114135296B CN202111405008.2A CN202111405008A CN114135296B CN 114135296 B CN114135296 B CN 114135296B CN 202111405008 A CN202111405008 A CN 202111405008A CN 114135296 B CN114135296 B CN 114135296B
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- grouting
- way pipeline
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- pipe
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000007246 mechanism Effects 0.000 title claims abstract description 14
- 239000011435 rock Substances 0.000 title claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims 1
- 230000005641 tunneling Effects 0.000 abstract description 14
- 239000003245 coal Substances 0.000 description 8
- 239000002002 slurry Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000005065 mining Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a grouting mechanism for rock mass and a continuous grouting method, wherein the grouting mechanism comprises two grouting pumps, a first grouting pipe and second grouting pipes respectively connected with the output ends of the grouting pumps, and the first grouting pipe is connected with the two second grouting pipes through a three-way pipeline; the three-way pipeline comprises two input ends and one output end, and a valve clack assembly is arranged in the three-way pipeline, so that the valve clack assembly is switched between the two input ends, and the valve clack assembly is rotationally connected between the two input ends; the first grouting pipe is connected with the output end of the three-way pipeline, the second grouting pipe is connected with the two input ends of the three-way pipeline respectively, and one end, far away from the three-way pipeline, of the first grouting pipe is also connected with a grouting anchor rod. The grouting mechanism and the continuous grouting method can realize continuous grouting, improve grouting quantity and grouting efficiency and meet the current tunneling requirements of the shield machine.
Description
Technical Field
The invention relates to a shield tunneling grouting process in coal mine tunneling, in particular to a grouting mechanism for rock mass and a continuous grouting method.
Background
Along with the continuous improvement of productivity, the production and utilization modes of coal in China are greatly changed, the traditional coal mining technology is gradually changed into intelligent, safe and green mining, and a way of high-quality development of clean, efficient and low-carbon utilization is realized. In modern coal mining, the tunneling work of coal is particularly important, so that the tunneling and anchoring of the coal tunneling working face is controlled in a centralized manner, operated remotely and carried out in a continuous manner in an auxiliary manner, and key working procedures of coal mining are intelligent, unmanned and less humanized.
At present, a new operation method of 5.5 m segment type shield tunneling machine tunneling is adopted for coal tunneling, the daily footage is 20m, the production speed is improved by nearly 10 times compared with that of the traditional tunneling method, the tunneling efficiency is greatly improved, and the mine production mode is changed in a subversion manner. Therefore, the traditional grouting reinforcement speed matched with the method cannot meet the high-speed operation method of the shield tunneling machine, and a new deep well rapid grouting reinforcement construction process must be developed.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a grouting mechanism and a continuous grouting method for a rock mass, which can realize continuous grouting, improve grouting quantity and grouting efficiency and meet the current tunneling requirements of a shield tunneling machine.
The technical scheme adopted for solving the technical problems is as follows: the grouting mechanism for the rock mass comprises two grouting pumps, a first grouting pipe and second grouting pipes which are respectively connected with the output ends of the grouting pumps, wherein the first grouting pipe is connected with the two second grouting pipes through a three-way pipeline;
The three-way pipeline comprises two input ends and one output end, and a valve clack assembly is arranged in the three-way pipeline, so that the valve clack assembly is switched between the two input ends, and the valve clack assembly is rotationally connected between the two input ends;
the first grouting pipe is connected with the output end of the three-way pipeline, the second grouting pipe is connected with the two input ends of the three-way pipeline respectively, and one end, far away from the three-way pipeline, of the first grouting pipe is also connected with a grouting anchor rod.
Optionally, an included angle between two input ends of the three-way pipeline is an acute angle.
Optionally, the valve clack assembly includes a rotating part and a plate body, wherein the plate body is fixedly connected with a rotating part of the rotating part, so that the plate body is driven to rotate by the rotating part;
one end of the plate body, which is far away from the rotating part, extends towards the inside of the three-way pipeline, and the section of the plate body is matched with the inner section of the three-way pipeline, so that the plate body forms a blocking state on one input end of the three-way pipeline after rotating.
Optionally, the rotating part comprises a fixed shaft and a rotator coated outside the fixed shaft, and the rotator rotates around the fixed shaft;
The plate body is fixed on the outer edge of the rotator.
Optionally, a fixing frame is arranged between two input ends of the three-way pipeline, and the fixing shaft is fixedly arranged on the fixing frame, so that the rotating part is arranged outside the three-way pipeline.
Optionally, an opening for inserting the plate body is arranged at the joint position of the two input ends of the three-way pipeline, and the length of the opening is adapted to the swing amplitude of the plate body;
and the plate body is fixedly connected with a sealing plate for sealing the opening, and the length of the sealing plate is greater than that of the opening.
Optionally, a connecting seat extending towards the axis direction is arranged at the connecting position of the two input ends in the three-way pipeline, and the fixed shaft is fixedly arranged on the connecting seat, so that the rotating part is arranged in the three-way pipeline.
Optionally, the inside of three-way pipeline is equipped with respectively at the end of two input with plate body complex step structure for the plate body is through step structure blocking after rotatory.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, two grouting pumps are adopted for grouting, and when one grouting pump fails or needs to be overhauled, the other grouting pump can be started quickly, so that quick and continuous grouting is realized;
2. According to the invention, the two grouting pumps are connected through the three-way pipeline, when the grouting pumps are required to be switched, the other grouting pump can be started directly without carrying the other grouting pump to the slurry tank from elsewhere, and the grouting pump is convenient and quick;
3. according to the three-way pipeline, when the three-way pipeline is switched, the valve plate assembly can quickly respond, grouting slurry is prevented from being blocked, and therefore quick and continuous grouting is achieved.
Based on the technical scheme, the invention also provides a continuous grouting method, which comprises the following steps:
Preparing two grouting pumps, and respectively connecting the output ends of the two grouting pumps with the two input ends of a three-way pipeline through a second grouting pipe, wherein the output end of the three-way pipeline is connected with a grouting anchor rod through a first grouting pipe;
Starting a first grouting pump in the two grouting pumps to perform grouting;
when the grouting pumps are switched, the first grouting pump which is running is closed, the second grouting pump is started, and a valve clack assembly in the three-way pipeline generates switching action, so that the output end of the three-way pipeline is communicated with the input end of the three-way pipeline connected with the second grouting pump.
Optionally, the valve clack assembly of the three-way pipeline comprises a rotating part and a plate body, wherein the plate body is fixedly connected with a rotating part of the rotating part, so that the plate body is driven to rotate through the rotating part;
one end of the plate body, which is far away from the rotating part, extends towards the inside of the three-way pipeline, and the section of the plate body is matched with the inner section of the three-way pipeline, so that the plate body forms a blocking state on one input end of the three-way pipeline after rotating.
Correspondingly, compared with the grouting method in the prior art, the continuous grouting method has the following beneficial effects:
1. according to the invention, two grouting pumps are adopted for grouting, and when one grouting pump fails or needs to be overhauled, the other grouting pump can be started quickly, so that quick and continuous grouting is realized;
2. According to the invention, the two grouting pumps are connected through the three-way pipeline, when the grouting pumps are required to be switched, the other grouting pump can be started directly without carrying the other grouting pump to the slurry tank from elsewhere, and the grouting pump is convenient and quick;
3. according to the three-way pipeline, when the three-way pipeline is switched, the valve plate assembly can quickly respond, grouting slurry is prevented from being blocked, and therefore quick and continuous grouting is achieved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic illustration of the structure of the valve flap assembly of the present invention as attached to the interior of a three-way pipe;
FIG. 3 is a schematic view of the structure of the valve flap assembly of the present invention as attached to the exterior of a three-way conduit;
FIG. 4 is a schematic cross-sectional view of a socket of the present invention with the valve flap assembly external;
fig. 5 is a schematic view of the connection of the sealing plate to the plate body according to the present invention.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the invention discloses a grouting mechanism for a rock mass, which is arranged in a rock mass tunnel and comprises two grouting pumps 1, a first grouting pipe 2 and a second grouting pipe 3 respectively connected with the output ends of the grouting pumps 1, wherein the input ends of the two grouting pumps 1 are respectively connected with a slurry tank so that the two grouting pumps 1 can grouting. The first grouting pipe 2 is connected with the two second grouting pipes 3 through a three-way pipeline 4, and a valve clack assembly capable of being automatically switched is arranged in the three-way pipeline 4 and is switched to a connection state at any time along with the internal pressure change of the three-way pipeline 4 so as to realize the mechanical switching of the valve clack assembly. The valve is characterized in that the valve is arranged in a rock mass roadway, flammable and explosive gas possibly exists, and if the electronic switching valve is adopted, an intrinsic safety type explosion-proof housing is additionally arranged outside the three-way pipeline, so that the three-way pipeline is not only required to be connected into a remote control system, the complexity of a control unit is increased, but also the maintenance and replacement work of a valve clack assembly are not facilitated.
Specifically, in the present invention, the three-way pipe 4 includes two input ends 401 and one output end 402, and a valve clack assembly is disposed in the three-way pipe 4, so that the valve clack assembly switches between the two input ends 401, so as to realize switching of channels in the three-way pipe 4. In addition, the valve clack assembly needs to be rotationally connected between the two input ends 401, wherein the first grouting pipe 2 is connected with the output end 402 of the three-way pipeline, the second grouting pipe 3 is respectively connected with the two input ends 401 of the three-way pipeline 4, and one end, far away from the three-way pipeline 4, of the first grouting pipe 2 is connected with a grouting anchor rod so as to realize grouting.
In the invention, the two second grouting pipes 3 are pipelines made of flexible materials so as to improve the flexibility of the second grouting pipes 3, specifically, two ends of each second grouting pipe 3 are respectively fixed with a joint 301, and the two joints 301 are respectively connected and fastened with the output end of the grouting pump 1 and the input end 401 of the three-way pipeline 4, so that the flexible second grouting pipes 3 can be bent during installation, and are convenient for installation work. The included angle between the two input ends 401 of the three-way pipeline 4 adopted by the invention is an acute angle, so that the rotation angle of the valve clack assembly is adapted to the included angle between the two input ends 401, specifically, the included angle between the two input ends 401 is 45-75 degrees, and at the moment, the rotation angle of the valve clack assembly is 45-75 degrees, therefore, the rotation angle of the valve clack assembly is adapted to the included angle between the two input ends 401, and the rotation angle of the valve clack assembly can be reduced by adopting the included angle between the two input ends 401 with an acute angle, so that the communication state of the three-way pipeline 4 can be switched more rapidly.
In the present invention, the valve flap assembly includes a rotation part 5 and a plate body 6, and the plate body 6 is fixedly connected with a rotation part of the rotation part 5, so that the plate body 6 is driven to rotate by the rotation part 5.
The plate body 6 that sets up is kept away from the one end extension to the inside of three-way pipe 4 of rotation portion 5 to the cross-section of plate body 6 suits with the inside cross-section of three-way pipe 4, makes plate body 6 form the shutoff state to one of them input 401 of three-way pipe 4 after rotating. For example, in one embodiment of the present invention, the internal section of the three-way pipe 4 is square, so that the section of the plate body 6 is also square, and meanwhile, the internal of the three-way pipe 4 is respectively provided with a step structure 7 at the end positions of the two input ends 401, and the step structures 7 are used for being matched with the plate body 6 to stop the plate body 6 from rotating continuously, that is, the plate body 6 rotates between the two step structures 7 to switch the corresponding input ends 401.
In the present invention, the rotating part 5 includes a fixed shaft 501 and a rotator 502 coated on the outside of the fixed shaft 501, the rotator 502 freely rotates around the fixed shaft 501, and the plate 6 is fixed on the outer edge of the rotator 502.
In the present invention, the rotating portion 5 has two mounting means, one of which is mounted inside the three-way pipe 4 and the other of which is mounted outside the three-way pipe 4. These two mounting means are described in detail below, respectively.
Mode 1 and the rotating portion 5 are installed inside the three-way pipe 4.
As shown in fig. 2, in this mounting method, the inside of the three-way pipe 4 has a connecting base 8 extending in the axial direction at the joint portion of the two input ends 401, a fixed shaft 501 is fixedly mounted on the connecting base 8, and a swivel 502 is rotatably connected to the fixed shaft 501. The advantage of this mounting is a high tightness, which is disadvantageous for the maintenance work of the plate body 6 and the rotating part 5.
Mode 2, the rotating portion 5 is installed outside the three-way pipe 4.
As shown in fig. 3 to 5, in this installation mode, a fixing frame 9 is provided between two input ends 401 of the three-way pipe 4, a fixing shaft 501 is fixedly installed on the fixing frame 9, and at the same time, an opening 10 for inserting the plate body 6 is provided at the connection position of the two input ends 401, and the length of the opening 10 is adapted to the swing amplitude of the plate body 6. The installation mode has the advantages that the overhaul of the plate body 6 can be facilitated, and the installation mode can be manufactured by field welding, so that the cost is saved.
Because there is the opening 10 here, consequently still fixedly connected with is used for shutoff opening 10's shrouding 11 on plate body 6, shrouding 11 is the flexible sheet, and shrouding 11's face and three-way pipe 4's lateral surface contact and sliding connection, shrouding 11's length is greater than opening 10's length, and opening 10's width should be accommodated with plate body 6. For example, in one embodiment of the present invention, the cross section of the three-way pipe 4 is square, slots 12 for inserting the sealing plates 11 are provided on four inner side walls of the opening 10, the slots 12 are arc-shaped slots, the circle center of the arc is located at the position of the fixed shaft 501, the sealing plates 11 are slidably inserted into the slots 12, and the length of the slots 12 should be greater than the length of the opening 10. As shown in fig. 5, the sealing plate 11 and the plate body 6 are connected by adopting a bolt and nut assembly, so that the middle part of the sealing plate 11 is provided with through grooves for inserting the plate body 6, the sealing plate 11 is distributed on two sides of the plate body 6, and the side parts of the plate body 6 are also covered by the sealing plate 11, namely, the width of the sealing plate 11 is larger than that of the plate body 6 but smaller than that of the three-way pipeline 4, and by adopting the structure, the opening 10 can be always plugged after the sealing plate 11 is connected with the plate body 6.
The grouting mechanism comprises the following steps of:
s1, firstly, preparing two grouting pumps 1, and respectively connecting the output ends of the two grouting pumps 1 with two input ends 401 of a three-way pipeline 4 through a second grouting pipe 3, wherein the output end 402 of the three-way pipeline 4 is connected with a grouting anchor rod through a first grouting pipe 2;
S2, starting a first grouting pump in the two grouting pumps 1 to perform grouting.
When the grouting pump 1 needs to be switched, the first grouting pump which is running is closed, the second grouting pump is started, at the moment, the internal pressure of the passage of the three-way pipeline 4 communicated with the first grouting pump is gradually reduced, the internal pressure of the passage of the three-way pipeline 4 communicated with the second grouting pump is gradually increased, and as the plate body 6 can freely rotate, the pressure born by the side surface of the plate body 6, which is close to the second grouting pump, is larger than the pressure born by the side surface of the plate body 6, which is close to the first grouting pump, the plate body 6 swings towards the direction of the first grouting pump under the action of the pressure difference until reaching the step structure 7, and at the moment, the slurry pumped by the second grouting pump enters the output end 402 of the three-way pipeline 4 in a sustainable manner. In the invention, the plate body 6 swings as long as the two side surfaces are subjected to pressure difference, so that the switching speed of the three-way pipeline 4 is improved, and continuous grouting is realized.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Other technical features besides those described in the specification are known to those skilled in the art, and are not described herein in detail to highlight the innovative features of the present invention.
Claims (6)
1. The grouting mechanism for the rock mass is characterized by comprising two grouting pumps, a first grouting pipe and a second grouting pipe which are respectively connected with the output ends of the grouting pumps, wherein the first grouting pipe is connected with the two second grouting pipes through a three-way pipeline;
The three-way pipeline comprises two input ends and one output end, and a valve clack assembly is arranged in the three-way pipeline, so that the valve clack assembly is switched between the two input ends, and the valve clack assembly is rotationally connected between the two input ends;
The first grouting pipe is connected with the output end of the three-way pipeline, the second grouting pipe is respectively connected with the two input ends of the three-way pipeline, and one end of the first grouting pipe, which is far away from the three-way pipeline, is also connected with a grouting anchor rod;
The valve clack assembly comprises a rotating part and a plate body, wherein the plate body is fixedly connected with a rotating part of the rotating part, so that the plate body is driven to rotate through the rotating part;
One end of the plate body, which is far away from the rotating part, extends towards the inside of the three-way pipeline, and the section of the plate body is matched with the section of the inside of the three-way pipeline, so that the plate body forms a blocking state on one input end of the three-way pipeline after rotating;
The rotating part comprises a fixed shaft and a rotating body coated outside the fixed shaft, and the rotating body rotates around the fixed shaft;
the plate body is fixed on the outer edge of the rotator;
a fixed frame is arranged between two input ends of the three-way pipeline, and the fixed shaft is fixedly arranged on the fixed frame, so that the rotating part is arranged outside the three-way pipeline;
an opening for inserting the plate body is formed in the joint position of the two input ends of the three-way pipeline, and the length of the opening is adapted to the swing amplitude of the plate body;
and the plate body is fixedly connected with a sealing plate for sealing the opening, and the length of the sealing plate is greater than that of the opening.
2. The grouting mechanism for rock masses of claim 1, wherein the angle between the two input ends of the tee pipe is acute.
3. The grouting mechanism for rock mass according to claim 1, wherein the inside of the three-way pipe has a connection seat extending in the axial direction at a junction portion of the two input ends, and the fixed shaft is fixedly installed on the connection seat such that the rotating portion is provided inside the three-way pipe.
4. A grouting mechanism for rock masses as claimed in claim 1 or claim 3, wherein the three-way pipe is provided with a stepped structure at each of its ends at both input ends, the stepped structure being adapted to engage the plate such that the plate is blocked by the stepped structure after rotation.
5. A method of continuous grouting comprising the steps of:
Preparing two grouting pumps, and respectively connecting the output ends of the two grouting pumps with the two input ends of a three-way pipeline through a second grouting pipe, wherein the output end of the three-way pipeline is connected with a grouting anchor rod through a first grouting pipe;
Starting a first grouting pump in the two grouting pumps to perform grouting;
when the grouting pumps are switched, the first grouting pump which is running is closed, the second grouting pump is started, and a valve clack assembly in the three-way pipeline generates switching action, so that the output end of the three-way pipeline is communicated with the input end of the three-way pipeline connected with the second grouting pump.
6. The method of continuous casting according to claim 5, wherein the valve flap assembly of the three-way pipe comprises a rotating portion and a plate fixedly connected to a rotating member of the rotating portion such that the plate is driven to rotate by the rotating portion;
one end of the plate body, which is far away from the rotating part, extends towards the inside of the three-way pipeline, and the section of the plate body is matched with the inner section of the three-way pipeline, so that the plate body forms a blocking state on one input end of the three-way pipeline after rotating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405008.2A CN114135296B (en) | 2021-11-24 | 2021-11-24 | Grouting mechanism and continuous grouting method for rock mass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405008.2A CN114135296B (en) | 2021-11-24 | 2021-11-24 | Grouting mechanism and continuous grouting method for rock mass |
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| Publication Number | Publication Date |
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| CN114135296A CN114135296A (en) | 2022-03-04 |
| CN114135296B true CN114135296B (en) | 2024-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111405008.2A Active CN114135296B (en) | 2021-11-24 | 2021-11-24 | Grouting mechanism and continuous grouting method for rock mass |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015428A (en) * | 2013-01-18 | 2013-04-03 | 中国十七冶集团有限公司 | Double-pump pipe inserting and grouting adjusting and controlling device and double-pump pipe inserting and grouting adjusting and controlling method |
| JP2014169773A (en) * | 2013-03-05 | 2014-09-18 | Hisaka Works Ltd | Flow channel switching device |
| CN104533452A (en) * | 2014-12-05 | 2015-04-22 | 中国矿业大学 | Sectional type grouting reinforcement method for underground coal mine fragmentized coal bodies |
| CN212775717U (en) * | 2020-08-12 | 2021-03-23 | 艾信智能环境科技(无锡)有限公司 | Three-way reversing valve for vertical pipeline |
| CN113027501A (en) * | 2021-05-07 | 2021-06-25 | 河南理工大学 | Self-drilling injection type anchor pipe anchoring device and method for coal mine |
-
2021
- 2021-11-24 CN CN202111405008.2A patent/CN114135296B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015428A (en) * | 2013-01-18 | 2013-04-03 | 中国十七冶集团有限公司 | Double-pump pipe inserting and grouting adjusting and controlling device and double-pump pipe inserting and grouting adjusting and controlling method |
| JP2014169773A (en) * | 2013-03-05 | 2014-09-18 | Hisaka Works Ltd | Flow channel switching device |
| CN104533452A (en) * | 2014-12-05 | 2015-04-22 | 中国矿业大学 | Sectional type grouting reinforcement method for underground coal mine fragmentized coal bodies |
| CN212775717U (en) * | 2020-08-12 | 2021-03-23 | 艾信智能环境科技(无锡)有限公司 | Three-way reversing valve for vertical pipeline |
| CN113027501A (en) * | 2021-05-07 | 2021-06-25 | 河南理工大学 | Self-drilling injection type anchor pipe anchoring device and method for coal mine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114135296A (en) | 2022-03-04 |
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