CN112459069B - Grouting system and grouting method based on special grouting movable cavity pressure adjustment - Google Patents
Grouting system and grouting method based on special grouting movable cavity pressure adjustment Download PDFInfo
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- CN112459069B CN112459069B CN202011142772.0A CN202011142772A CN112459069B CN 112459069 B CN112459069 B CN 112459069B CN 202011142772 A CN202011142772 A CN 202011142772A CN 112459069 B CN112459069 B CN 112459069B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a grouting system and a grouting method based on special grouting movable cavity pressure adjustment, and relates to the technical field of grouting. The grouting valve pipe comprises a main grouting pipe and a plurality of grouting valve pipes connected to the main grouting pipe, wherein each grouting valve pipe is positioned in an annular space in the wall of a drill hole, each grouting valve pipe comprises a grouting valve pipe body, and a grouting valve port is arranged on each grouting valve pipe body; the grouting valve pipe is internally provided with a grouting pipe, a gas injection pipe and a movable piston, the gas injection pipe is connected with the movable piston, air pressure is applied into the movable piston through the gas injection pipe, the movable piston after the air pressure is applied generates volume expansion, a closed cavity is generated between the lower part of the movable piston and the grouting valve pipe body, and grouting is performed into the grouting valve pipe body according to the position of the movable piston. The grouting system can adjust the pressure of a single grouting valve pipe, thereby realizing special grouting on different target layers and improving the field construction efficiency.
Description
Technical Field
The invention relates to the technical field of grouting, in particular to a grouting system and a grouting method based on special grouting movable cavity pressure adjustment.
Background
In the foundation treatment engineering, pressure grouting is a relatively conventional means, and pressure control in the grouting process is a difficult point in the engineering. Because the pressure control value is closely related to the geological condition and the embedding depth of the grouting opening, the pressure control of single pipe grouting presents a very serious challenge. In a conventional grouting pipe, grouting pressure in a single pipe is consistent, and different pressures at different depths or different pressures in different geological soil layers are difficult to realize.
In the grouting foundation treatment process, the treatment effect and the engineering construction cost depend on the grouting amount to a great extent, the grouting amount depends on the grouting pressure to a great extent, slurry with too low pressure cannot effectively permeate and diffuse into a soil body, and the surface of the earth is easy to bulge due to too high pressure. The grouting pressure is properly controlled, and the treatment effect and the construction cost can be effectively met.
The grouting pipe and the grouting valve pipe can only control grouting pressure singly, and different grouting pressures can not be controlled aiming at different depths and different geological soil layers, and a plurality of grouting pipes are adopted at present, so that the grouting valve port can perform grouting on different depths and soil layers, the punching quantity is caused, the quantity of the grouting pipes is increased, the construction period is delayed, and the engineering construction cost is increased.
Disclosure of Invention
One of the purposes of the invention is to provide a grouting system with adjustable pressure based on a special grouting moving cavity, which can adjust the pressure of a single grouting valve pipe, thereby realizing special grouting on different target layers and improving the field construction efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a grouting system with adjustable pressure based on a special grouting moving cavity comprises a main grouting pipe and a plurality of grouting valve pipes connected to the main grouting pipe, wherein each grouting valve pipe is located in an annular space in a drilling hole wall and comprises a grouting valve pipe body, and a grouting valve port is arranged on the grouting valve pipe body;
a grouting pipe, a gas injection pipe and a movable piston are arranged in the grouting valve pipe body, the outer diameter of the movable piston is smaller than the inner diameter of the grouting valve pipe body, the gas injection pipe is connected with the movable piston, gas pressure is applied to the movable piston through the gas injection pipe, the movable piston after the gas pressure is applied generates volume expansion, a closed cavity is generated between the lower part of the movable piston and the grouting valve pipe body, and grouting is performed in the grouting valve pipe body according to the position of the movable piston;
the grouting pipe penetrates through the movable piston and is used for grouting into the grouting valve pipe body through the grouting pipe.
In a preferred embodiment of the present invention, the different grouting pressures in each grouting valve pipe are designed by adjusting the magnitude of the air pressure applied by the air injection pipe into the movable piston.
As another preferable scheme of the present invention, a plurality of the guniting valve ports are provided, and a valve port protection pad is fixedly connected to each guniting valve port, and is used for temporarily blocking the guniting valve ports from being blocked by a target object in an installation process.
Preferably, the valve port protection pad is fixed at the corresponding guniting valve port in a binding manner.
Further preferably, a gas supply device is connected to the gas injection pipe, and gas is injected into the gas injection pipe by the gas supply device.
The invention also aims to provide a grouting method based on special grouting movable cavity pressure adjustment, which sequentially comprises the following steps:
s1, after drilling, arranging each grouting valve pipe in an annular space in the wall of the drill hole, and installing the grouting pipe, the gas injection pipe and the movable piston in the grouting valve pipe body to ensure that the device is connected perfectly;
s2, injecting gas into the gas injection pipe, and gradually expanding the movable piston connected with the gas injection pipe to form a closed cavity between the lower part of the movable piston and the grouting valve pipe body;
s3, according to geological conditions, when different grouting pressures are needed in each grouting valve pipe, adjusting the grouting pressures in different grouting valve pipes according to different amounts of gas injected into the gas injection pipes in each grouting valve pipe;
s4, when different grouting pressures are needed in the same grouting valve pipe, different amounts of gas are injected to form closed cavities with different heights between the lower part of the movable piston and the grouting valve pipe body so as to adjust the grouting pressure in the same grouting valve pipe;
and S5, repeating the step S3 or S4 until the whole grouting process is completed.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a grouting system with adjustable pressure based on a special grouting moving cavity, wherein different air pressures are applied to a movable piston through a gas injection pipe to generate closed cavities with different depths, so that the pressure in a single grouting valve pipe is adjusted, the single grouting valve pipe can realize multilayer grouting, and different grouting pressures can be designed for the grouting depth of each layer according to geological conditions, so that the grouting valve pipe can carry out special grouting on a target soil layer, and the single grouting valve pipe realizes multilayer grouting, thereby obviously improving the field construction efficiency, avoiding additional drilling and saving the engineering construction cost.
According to the invention, the plurality of grouting valve pipes are connected with the main grouting pipe, and the pressure of each grouting valve pipe can be adjusted, for example, different pressures can be kept in different grouting valve pipes by applying different air pressures to the movable piston through the air injection pipe in each grouting valve pipe, so that the field construction requirements are met.
Compared with the prior art, the grouting system with the adjustable pressure based on the special grouting movable cavity can realize the adjustment of the pressure of a single grouting valve pipe and the adjustment of the pressure of different grouting valve pipes, and is worthy of popularization and application.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural view of a single grouting valve tube of the present invention;
FIG. 2 is a schematic structural diagram of a grouting system with adjustable pressure based on a special grouting moving cavity;
in the figure: 1. the grouting valve comprises a grouting valve pipe body 2, a movable piston 3, a grouting pipe 4, a gas injection pipe 5, a guniting valve port 6 and a valve port protection pad; 7. a slurry supply device; 8. and an air supply device.
Detailed Description
The invention provides a grouting system with adjustable pressure based on a special grouting movable cavity, and in order to make the advantages and technical scheme of the invention clearer and clearer, the invention is described in detail below by combining specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Spatially relative terms, such as "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" can encompass both an orientation of below and above. Other orientations of the components are possible (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
The invention provides a grouting system with adjustable pressure based on a special grouting moving cavity, which mainly comprises a main grouting pipe and a plurality of grouting valve pipes connected to the main grouting pipe as shown in figure 2, wherein each grouting valve pipe is positioned in an annular space in the wall of a drill hole during actual grouting and is used as a grouting valve pipe of a main improvement point of the invention, a grouting device 7 is used for grouting to the main grouting pipe, and then each grouting valve pipe is grouted through the main grouting pipe, the structure of the grouting valve pipe is shown in figure 1, the grouting valve pipe comprises a grouting valve pipe body 1, a plurality of grouting valve ports 5 are arranged on the grouting valve pipe body 1, the plurality of grouting valve ports 5 are arranged at equal intervals from bottom to top, or a plurality of grouting valve ports are arranged at the same horizontal position of the grouting valve pipe body 1, the arrangement of the grouting valve ports 5 can be reasonably selected by technicians in the field according to different geological conditions, when grouting to the grouting valve pipe body through the grouting pipes, the surrounding soil body is grouted through the guniting valve port 5.
The grouting valve pipe body is internally provided with a grouting pipe 3, a gas injection pipe 4 and a movable piston 2, the grouting pipe 3 is made of materials commonly used by the grouting pipe in the prior art during grouting, the gas injection pipe 4 is connected with a gas supply device 8 which mainly supplies gas through the gas supply device, the outer diameter of the movable piston is smaller than the inner diameter of the grouting valve pipe body, after the movable piston is filled with gas, the movable piston can form a closed space with the grouting valve pipe body through expansion, the bottom of the gas injection pipe is connected with the movable piston, the top of the gas injection pipe is connected with the gas supply device, when the gas is filled into the gas injection pipe through the gas supply device, the gas enters the movable piston from the bottom of the gas injection pipe, namely, the gas pressure is applied into the movable piston through the gas injection pipe, the movable piston after the gas pressure is applied generates volume expansion, and a closed cavity is generated between the lower part of the movable piston and the grouting valve pipe body, and grouting into the grouting valve pipe body according to the position of the movable piston.
The grouting pipe penetrates through the movable piston and is used for grouting into the grouting valve pipe body through the grouting pipe.
In order to prevent the device from blocking the guniting valve port by the surrounding soil during installation, a port protection pad 6 is fixed at the guniting valve port, and the port protection pad 6 is larger than the guniting valve port in area and is preferably fixed at the guniting valve port in a binding manner.
The invention can realize applying different pressures to a single grouting valve pipe, for example, in the grouting process, a certain amount of gas is injected into the movable piston to expand the movable piston to a certain height, at the moment, a closed cavity is formed between the lower part of the movable piston and the grouting valve pipe body, and at the moment, the grouting pipe is applied with pressure for grouting; and continuously injecting gas into the movable piston to enable the movable piston to continuously expand to a height above the primary expansion, forming a closed cavity between the lower part of the movable piston and the grouting pipe body again, and applying different pressures to the grouting pipe to perform grouting.
The invention can realize that the pressure of a single grouting valve pipe is adjusted when grouting once, for example, the height formed between the movable pistons in different grouting valve pipes and the grouting valve pipe body is different by injecting different amounts of gas into different grouting valve pipes, namely, the grouting pipes apply different pressures for grouting.
The grouting method of the invention is further explained below with reference to the above grouting system with adjustable pressure based on a special grouting moving cavity.
Example 1:
when different pressures are required to be applied to a single grouting valve pipe, multilayer grouting is achieved on the single grouting valve pipe in a mode that the movable piston and the grouting valve pipe body generate closed cavities with different depths, and different grouting pressures can be designed for the grouting depth of each layer according to geological conditions, so that the method has the advantages of specially grouting a target soil layer, achieving multilayer grouting through a single pipe and improving the field construction efficiency.
The concrete grouting method comprises the following steps:
firstly, designing the position of a guniting valve port according to geological conditions;
secondly, paying off on site, determining the position of a grouting valve pipe and drilling a well through a drilling machine;
thirdly, mounting a grouting valve pipe body, and placing a movable piston, a grouting pipe and a gas injection pipe in the grouting valve pipe body according to the design of the invention;
fourthly, confirming the grouting position, and pressurizing and inflating the movable piston to form a closed cavity;
fifthly, selecting design pressure to pressurize and grout the grouting pipe according to geological conditions, grouting depth and other factors;
sixthly, moving the movable piston to the upper part of the upper layer of the guniting valve port, and pressurizing and inflating again to form a second closed cavity;
seventhly, selecting another design pressure to pressurize and grout the grouting pipe according to geological conditions, grouting depth and other factors;
and step eight, repeating the step six and the step seven until the whole grouting process is finished.
Example 2:
as shown in fig. 2, when the grouting system is used in different strata such as sand layers and soil layers, different pressures need to be applied to different grouting valve pipes, and at the moment, each grouting valve pipe is grouted in a manner that a movable piston and each grouting valve pipe body generate closed cavities with different depths.
The concrete grouting method comprises the following steps:
firstly, designing the position of a guniting valve port according to geological conditions;
secondly, paying off on site, determining the position of a grouting valve pipe and drilling a well through a drilling machine;
thirdly, mounting the grouting valve pipe body, and placing the movable piston, the grouting pipe and the gas injection pipe in the grouting valve pipe body according to the design of the invention
Fourthly, respectively confirming the grouting position of each grouting valve pipe, and pressurizing and inflating respective movable pistons to form closed cavities with different heights;
fifthly, grouting in each grouting valve pipe; if the grouting pressure needs to be adjusted, the height of the closed cavity between the movable piston and the grouting valve pipe body is continuously adjusted.
And sixthly, repeating the fourth step and the fifth step until the whole grouting process is finished.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto.
Although terms such as a grouting valve tube body, a movable piston, a grouting tube, a gas injection tube, etc., are used more often herein, the possibility of using other terms is not excluded, and these terms are used only for the purpose of more conveniently describing and explaining the essence of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
It is further understood that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (4)
1. A grouting method based on special grouting movable cavity pressure adjustment is characterized in that a grouting system based on special grouting movable cavity pressure adjustment is adopted for implementation;
the grouting system with adjustable pressure based on the special grouting moving cavity comprises a main grouting pipe and a plurality of grouting valve pipes connected to the main grouting pipe, wherein each grouting valve pipe is positioned in an annular space in the wall of a drill hole,
the grouting valve pipe comprises a grouting valve pipe body, and a guniting valve port is arranged on the grouting valve pipe body;
a grouting pipe, a gas injection pipe and a movable piston are arranged in the grouting valve pipe body, the outer diameter of the movable piston is smaller than the inner diameter of the grouting valve pipe body, the gas injection pipe is connected with the movable piston, gas pressure is applied to the movable piston through the gas injection pipe, the movable piston after the gas pressure is applied generates volume expansion, a closed cavity is generated between the lower part of the movable piston and the grouting valve pipe body, and grouting is performed in the grouting valve pipe body according to the position of the movable piston;
the grouting pipe penetrates through the movable piston and is used for grouting into the grouting valve pipe body through the grouting pipe;
the grouting method sequentially comprises the following steps:
s1, after drilling, arranging each grouting valve pipe in an annular space in the wall of the drill hole, and installing the grouting pipe, the gas injection pipe and the movable piston in the grouting valve pipe body to ensure that the device is connected perfectly;
s2, injecting gas into the gas injection pipe, and gradually expanding the movable piston connected with the gas injection pipe to form a closed cavity between the lower part of the movable piston and the grouting valve pipe body;
s3, according to geological conditions, when different grouting pressures are needed in each grouting valve pipe, adjusting the grouting pressures in different grouting valve pipes according to different amounts of gas injected into the gas injection pipes in each grouting valve pipe;
s4, when different grouting pressures are needed in the same grouting valve pipe, different amounts of gas are injected to form closed cavities with different heights between the lower part of the movable piston and the grouting valve pipe body so as to adjust the grouting pressure in the same grouting valve pipe;
s5, repeating the step S3 or S4 until the whole grouting process is completed;
and different grouting pressures in each grouting valve pipe are designed by adjusting the air pressure applied into the movable piston by the air injection pipe.
2. The grouting method capable of adjusting the pressure of the movable cavity based on the special grouting according to claim 1, characterized in that: the spraying valve port is provided with a plurality of spraying valve ports, a valve port protection pad is fixedly connected to each spraying valve port, and the valve port protection pads are used for temporarily blocking the blockage of a target object to the spraying valve ports in the installation process.
3. The grouting method capable of adjusting the pressure of the movable cavity based on the special grouting according to claim 2, characterized in that: the valve port protection pad is fixed at the corresponding guniting valve port in a binding mode.
4. The grouting method capable of adjusting the pressure of the movable cavity based on the special grouting according to claim 1, characterized in that: the gas injection pipe is connected with a gas supply device, and gas is injected into the gas injection pipe through the gas supply device.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011142772.0A CN112459069B (en) | 2020-10-23 | 2020-10-23 | Grouting system and grouting method based on special grouting movable cavity pressure adjustment |
| PCT/CN2020/134502 WO2022082953A1 (en) | 2020-10-23 | 2020-12-08 | Grouting system and grouting method based on pressure-adjustable special grouting moving cavity |
| US17/294,658 US20220307216A1 (en) | 2020-10-23 | 2020-12-08 | Special-grouting-based grouting system with adjustable moving cavity pressure and grouting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011142772.0A CN112459069B (en) | 2020-10-23 | 2020-10-23 | Grouting system and grouting method based on special grouting movable cavity pressure adjustment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112459069A CN112459069A (en) | 2021-03-09 |
| CN112459069B true CN112459069B (en) | 2021-11-19 |
Family
ID=74834141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011142772.0A Active CN112459069B (en) | 2020-10-23 | 2020-10-23 | Grouting system and grouting method based on special grouting movable cavity pressure adjustment |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20220307216A1 (en) |
| CN (1) | CN112459069B (en) |
| WO (1) | WO2022082953A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113322936B (en) * | 2021-06-25 | 2022-06-14 | 中建三局第三建设工程有限责任公司 | Soil body reinforcing construction method and construction auxiliary device for thick sand layer karst area |
| CN115030139B (en) * | 2022-06-27 | 2023-06-23 | 新疆博际建筑工程有限责任公司 | Novel steel pipe pile for soft soil site and construction method thereof |
| CN115839089B (en) * | 2022-11-04 | 2023-07-07 | 中国水利水电第三工程局有限公司 | Curtain grouting construction method suitable for Danxia landform area |
| CN116044455B (en) * | 2023-04-03 | 2023-06-23 | 湖南大学 | Grouting system for directional reinforcement of tunnel |
| CN117306533B (en) * | 2023-11-29 | 2024-01-26 | 江苏晓宇水利建设有限公司 | Water conservancy protection dam cementer with automatic compaction function |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002266341A (en) * | 2001-03-08 | 2002-09-18 | Denki Kagaku Kogyo Kk | Injecting device |
| KR100795204B1 (en) * | 2006-05-30 | 2008-01-16 | 김상수 | Pressurized grouting packer with waterproof function |
| KR100817526B1 (en) * | 2006-12-20 | 2008-03-27 | 백경재 | Packer for grouting |
| KR100817527B1 (en) * | 2006-12-20 | 2008-03-27 | 백경재 | Packer for grouting |
| JP6329385B2 (en) * | 2014-02-20 | 2018-05-23 | 大成建設株式会社 | Implantable injection tube |
| KR20160012437A (en) * | 2014-07-24 | 2016-02-03 | 강종호 | mortar grout compaction grouting system |
| CN204456128U (en) * | 2015-01-21 | 2015-07-08 | 河北省建筑科学研究院 | A kind of delamination pour slurry rifle |
| CN106639973A (en) * | 2016-12-19 | 2017-05-10 | 中铁建大桥工程局集团第二工程有限公司 | Grouting structure and grouting method for ground surface ultra-deep hole double liquid slurry grouting |
| KR101851959B1 (en) * | 2017-06-13 | 2018-04-25 | 최제인 | Grout same time injection apparatus and a method of construction using the same |
| CN107654206B (en) * | 2017-09-21 | 2020-06-05 | 青岛地质工程勘察院(青岛地质勘查开发局) | Drilling water stopping device and water stopping method |
| CN207583345U (en) * | 2017-12-18 | 2018-07-06 | 平顶山天安煤业股份有限公司四矿 | Mining drilling pump drainage fluid filling hole sealing device |
| CN108180024A (en) * | 2018-03-07 | 2018-06-19 | 中铁二院昆明勘察设计研究院有限责任公司 | A kind of air bag grouting stop-valve tube assembly convenient for bored grouting construction |
| CN209277160U (en) * | 2018-09-10 | 2019-08-20 | 河南理工大学 | A kind of inflatable stop grouting plug for sleeve valve barrel grouting |
| CN110984900A (en) * | 2019-12-09 | 2020-04-10 | 北京慧坤科技有限公司 | Device and method for stopping water in drilling |
| CN111519604A (en) * | 2020-04-30 | 2020-08-11 | 河北建设勘察研究院有限公司 | Deep-hole sleeve valve pipe grouting device and application method thereof |
-
2020
- 2020-10-23 CN CN202011142772.0A patent/CN112459069B/en active Active
- 2020-12-08 WO PCT/CN2020/134502 patent/WO2022082953A1/en active Application Filing
- 2020-12-08 US US17/294,658 patent/US20220307216A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20220307216A1 (en) | 2022-09-29 |
| WO2022082953A1 (en) | 2022-04-28 |
| CN112459069A (en) | 2021-03-09 |
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