CN107938703B - Composite node structure of steel pipe gallery - Google Patents
Composite node structure of steel pipe gallery Download PDFInfo
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- CN107938703B CN107938703B CN201711324358.XA CN201711324358A CN107938703B CN 107938703 B CN107938703 B CN 107938703B CN 201711324358 A CN201711324358 A CN 201711324358A CN 107938703 B CN107938703 B CN 107938703B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 118
- 239000010959 steel Substances 0.000 title claims abstract description 118
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 33
- 238000010276 construction Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 18
- 238000005728 strengthening Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a composite node structure of a steel pipe gallery, which is arranged between the ground and the steel pipe gallery and comprises a manhole pipe, a feeding pipe and a reinforcing structure, wherein a hole is formed in the ground, the upper end of the manhole pipe and the upper end of the feeding pipe are communicated with the hole, the lower end of the manhole pipe and the lower end of the feeding pipe respectively penetrate through the steel pipe gallery and are communicated with the inside of the steel pipe gallery, an included angle is formed between the manhole pipe and the feeding pipe, and the reinforcing structure is arranged among the manhole pipe, the feeding pipe and the steel pipe gallery. According to the invention, the reinforcing structures are arranged among the manduct, the feeding pipe and the steel pipe gallery, so that the influence on the structural strength of the steel pipe gallery in the node construction process can be effectively reduced, and meanwhile, the upper ends of the manduct and the feeding pipe are communicated with the same opening on the ground, so that the number of openings on the ground can be effectively reduced, and therefore, ground obstacles are reduced.
Description
Technical Field
The invention relates to the technical field of comprehensive pipe galleries, in particular to a composite node structure of a steel pipe gallery.
Background
The node is a relatively complex local structure in the pipe gallery, such as a manhole, a feeding lifting port and the like. The inclined feeding lifting port is a channel for lifting in and out the pipeline and equipment in the pipe gallery. The manhole is a passage for personnel to enter and exit the interior of the pipe rack during the maintenance and repair of the pipe rack.
In the construction of steel utility tunnel, nodes such as material hoist and mount mouth, manhole are thrown to unavoidable needs construction, but every node of building, all need carry out the trompil to steel pipe gallery structure itself and subaerial to construct between steel structure and ground, just so weakened steel pipe gallery structure self intensity and increased the ground obstacle, all provided higher requirement to design and construction.
In view of the above, researchers in the field have endeavored to find a structural form that will reduce the impact on the structural strength of the steel pipe gallery and reduce ground obstructions when constructing the steel pipe gallery nodes.
Disclosure of Invention
The invention aims to provide a composite node structure of a steel pipe gallery, which can effectively reduce the influence on the structural strength of the steel pipe gallery when the nodes of the steel pipe gallery are established and reduce ground obstacles.
In order to achieve the purpose, the invention provides a composite node structure of a steel pipe gallery, wherein the composite node structure of the steel pipe gallery is arranged between the ground and the steel pipe gallery, the composite node structure of the steel pipe gallery comprises a manhole pipe, a feeding pipe and a reinforcing structure, a hole is formed in the ground, the upper end of the manhole pipe and the upper end of the feeding pipe are communicated with the hole, the lower end of the manhole pipe and the lower end of the feeding pipe respectively penetrate through the steel pipe gallery and are communicated with the inside of the steel pipe gallery, an included angle is formed between the manhole pipe and the feeding pipe, and the reinforcing structure is arranged among the manhole pipe, the feeding pipe and the steel pipe gallery.
The composite node structure of the steel pipe gallery is characterized in that the manhole pipe is arranged perpendicular to the ground, and the inner diameter of the manhole pipe is equal to the aperture of the open hole.
The composite node structure of the steel pipe gallery is characterized in that the upper end of the feeding pipe penetrates through the side wall of the manhole pipe and is communicated with the open hole through the upper end of the manhole pipe.
The composite node structure of the steel pipe gallery is characterized in that the intersection point of the central axis of the human pipe and the central axis of the feeding pipe is positioned in the plane of the ground or higher than the ground.
The composite node structure of the steel pipe gallery is characterized in that a ladder is arranged inside the manhole pipe, and the ladder extends to the inner bottom surface of the steel pipe gallery along the upper end of the manhole pipe in the axial direction.
The composite node structure of the steel pipe gallery comprises a steel pipe gallery, a manhole pipe and a feeding pipe, wherein the reinforcing structure is arranged in a space formed by enclosing the steel pipe gallery, the manhole pipe and the feeding pipe, and is fixedly connected with the outer surface of the steel pipe gallery, the outer surface of the manhole pipe and the outer surface of the feeding pipe respectively.
The composite node structure of the steel pipe gallery as described above, wherein the reinforcing structure is a combination of one or more of reinforcing plates, reinforcing plate nets and reinforcing ribs.
The composite node structure of the steel pipe gallery comprises a central axis of the manmade pipe and a central axis of the feeding pipe, wherein the included angle between the central axis of the manmade pipe and the central axis of the feeding pipe is as follows:
arccotμ≤α＜90°，
mu is a friction factor between a pipeline to be fed into the feeding pipe and the inner wall of the feeding pipe, and alpha is an included angle between the central axis of the feeding pipe and the central axis of the human pipe.
The composite node structure of the steel pipe gallery comprises a first perforation formed at the joint of the lower end of the manmade pipe and the steel pipe gallery, a second perforation formed at the joint of the feeding pipe and the steel pipe gallery, and the distance between the center of the first perforation and the center of the second perforation is in the range:
0≤L≤(h/L)，
wherein h is a distance between the ground and the outer surface of the top of the steel pipe gallery, and L is a distance between the center of the first perforation and the center of the second perforation.
The composite node structure of the steel pipe gallery is characterized in that the inner diameter range of the mantube is as follows:
φ mantube ≥1000mm，
Wherein phi Mantube Is the inner diameter of the human tube;
the inner diameter range of the feeding pipe is as follows:
φ feeding pipe The outer diameter of the pipeline to be fed in the feeding pipe is more than or equal to +200mm,
wherein phi is Feeding pipe The inner diameter of the feeding pipe.
Compared with the prior art, the invention has the following advantages:
according to the invention, the reinforcing structures are arranged among the manduct, the feeding pipe and the steel pipe gallery, so that the influence on the structural strength of the steel pipe gallery in the node construction process can be effectively reduced, and meanwhile, the upper ends of the manduct and the feeding pipe are communicated with the same opening on the ground, so that the number of openings on the ground can be effectively reduced, and therefore, ground obstacles are reduced.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
fig. 1 is a schematic structural view of a composite node structure of a steel pipe gallery provided by the present invention.
The reference numbers illustrate:
1. a steel pipe gallery;
2. a ground surface;
3. a human tube;
4. a feeding pipe;
5. a reinforcing structure;
6. a ladder;
7. a pipeline to be thrown;
8. waterproof boss
Detailed Description
In order to clearly understand the technical solution, the purpose and the effect of the present invention, a detailed description of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1, the invention provides a composite node structure of a steel pipe gallery, wherein the composite node structure of the steel pipe gallery is arranged between a ground 2 and the steel pipe gallery 1, when the steel pipe gallery 1 is laid, the axis of the steel pipe gallery 1 is parallel to the ground 2, the composite node structure of the steel pipe gallery comprises a manhole 3, a feeding pipe 4 and a reinforcing structure 5, the manhole 3 is a pipeline for workers to enter and exit the steel pipe gallery 1, the feeding pipe 4 is a pipeline for feeding a pipeline 7 to be fed into the steel pipe gallery 1, the ground 2 is provided with an opening, the upper end of the manhole 3 and the upper end of the feeding pipe 4 are communicated with the opening, the workers enter and exit the manhole 3 and feed the pipeline 7 to be fed into the steel pipe gallery 1 through the same opening arranged on the ground 2, and compared with the prior art, the number of the openings on the ground 2 can be effectively reduced, so that obstacles on the ground 2 are reduced; lower extreme and the lower extreme of throwing material pipe 4 of people's pipe 3 run through steel pipe gallery 1 respectively and communicate with the inside of steel pipe gallery 1, people's pipe 3 and throw the material pipe 4 between form the contained angle, and people's pipe 3, it is equipped with additional strengthening 5 to throw between material pipe 4 and the steel pipe gallery 1, people's pipe 3, it forms a triangular fretwork region to throw between material pipe 4 and the steel pipe gallery 1, can improve the structural strength of steel pipe gallery 1 through set up additional strengthening 5 in this fretwork region, in order to compensate set up the intercommunicating pore (first perforation and second perforation hereafter) that communicate with people's pipe 3 and throwing material pipe 4 on steel pipe gallery 1 and the structural strength who causes descends, so can effectively reduce the influence that the structural strength of steel pipe gallery 1 caused in the node construction process compared with prior art.
Further, as shown in fig. 1, the invention provides a composite node structure of a steel pipe gallery, wherein a manhole 3 is arranged perpendicular to a ground 2, the length of the manhole 3 can be reduced to the minimum extent, the path length of a worker entering and exiting the steel pipe gallery 1 is reduced, the worker can conveniently and rapidly enter and exit the steel pipe gallery 1, the inner diameter of the manhole 3 is equal to the aperture of an opening, when the composite node structure is arranged, the upper end surface of the manhole 3 and the ground 2 are directly arranged in a flush state, and the upper end of the manhole 3 penetrates through the ground 2 to form the opening, so that the condition that the road surface around the opening collapses and falls into the steel pipe gallery 1 along the manhole 3 to pollute the environment in the steel pipe gallery 1 is avoided, and the safety of the worker inside the steel pipe gallery 1 is prevented from being threatened.
Further, as shown in fig. 1, the present invention provides a composite node structure of a steel pipe gallery, wherein the upper end of a feeding pipe 4 penetrates through the side wall of a manhole 3 and is communicated with an opening through the upper end of the manhole 3. Throw material pipe 4 promptly and actually be the upper end intercommunication with people's pipe 3 to through people's pipe 3 upper end and trompil intercommunication, throw material pipe 4 upwards only extend to with people's pipe 3 intercommunication can, and can not stretch into the inside to people's pipe 3, cause the business turn over of avoiding throwing material pipe 4 to the staff in people's pipe 3 and block.
Because the people's pipe 3 is perpendicular to steel piping lane 1 setting, and the contained angle has between people's pipe 3 and the feeding pipe 4, then feeding pipe 4 and steel piping lane 1 between have an contained angle that is less than 90, so set up and make and treat the in-process of throwing pipeline 7 in the input, make and treat that throwing pipeline 7 slides to steel piping lane 1 along the inclined plane in, reduce and treat when throwing pipeline 7 gets into steel piping lane 1 and the interaction force between the steel piping lane 1, reduce steel piping lane 1 and treat the impaired probability of throwing pipeline 7, can effectively prevent to treat that throwing pipeline 7 overlength and receive the circumstances that blocks and can't get into steel piping lane 1 completely of feeding pipe 4 to take place simultaneously.
Further, as shown in fig. 1, the present invention provides a composite node structure of a steel pipe gallery, wherein the intersection point of the central axis of the mantube 3 and the central axis of the feeding pipe 4 is located in the plane of the ground 2 or higher than the ground 2. So when setting up, in vertical plane, along throwing the axial of material pipe 4, draw the extension line of throwing material pipe 4 above ground 2, throw and can not produce intersection between the extension line of material pipe 4 and the pipe wall of people's pipe 3, consequently when waiting to throw throwing of pipeline 7 through throwing material pipe 4, wait to throw pipeline 7 and can not take place the contact with people's pipe 3 when fully getting into throwing material pipe 4, effectively avoided people's pipe 3 to throw the material and cause and block, in order to guarantee to wait to throw pipeline 7 and normally put in.
Further, as shown in fig. 1, the present invention provides a composite node structure of a steel pipe gallery, wherein a ladder 6 is provided inside a manhole pipe 3, and the ladder 6 extends from the upper end of the manhole pipe 3 to the inner bottom surface of the steel pipe gallery 1 along the axial direction of the manhole pipe 3. The ladder 6 is arranged to facilitate the working personnel to enter and exit the steel pipe gallery 1, or an electric lifting mechanism can be arranged in the manhole pipe 3 to realize the lifting of the working personnel along the manhole pipe 3, and the invention is not limited by the invention.
Further, as shown in fig. 1, the invention provides a composite node structure of a steel pipe gallery, wherein a reinforcing structure 5 is arranged in a space formed by enclosing among the steel pipe gallery 1, the artificial pipe 3 and the feeding pipe 4, and the reinforcing structure 5 is fixedly connected with the outer surface of the steel pipe gallery 1, the outer surface of the artificial pipe 3 and the outer surface of the feeding pipe 4 respectively. So can support and keep people's pipe 3 and throw material pipe 4, strengthen steel pipe gallery 1's structure, reduce the node and build the influence that causes steel pipe gallery 1's structural strength.
Still further, the present invention provides a composite node structure of a steel pipe gallery, wherein the reinforcing structure 5 is a combination of one or more of a reinforcing plate, a reinforcing mesh and a reinforcing rib. Preferably, the reinforcing structure 5 is a reinforcing plate, and reinforcing ribs are integrally formed on both side surfaces of the reinforcing plate in the transverse and longitudinal directions and arranged in a cross manner. However, the reinforcing structure 5 may be other structural members as long as the reinforcing member can improve the structural strength of the steel pipe gallery 1, and the present invention is not limited thereto.
Preferably, as shown in fig. 1, the invention provides a composite node structure of a steel pipe gallery, wherein the included angle between the central axis of the mantube 3 and the central axis of the feeding tube 4 is in the range:
arccotμ≤α＜90°，
mu is a friction factor between a pipeline 7 to be thrown into the feeding pipe 4 and the inner wall of the feeding pipe 4, and alpha is an included angle between the central axis of the feeding pipe 4 and the central axis of the mantube 3. The friction factor mu is determined by the material of the pipeline 7 and the feeding pipe 4 and the quality of the pipeline 7.
Preferably, as shown in fig. 1, the present invention provides a composite node structure of a steel pipe gallery, wherein a first perforation is formed at the joint of the lower end of a mantube 3 and the steel pipe gallery 1, a second perforation is formed at the joint of a feeding tube 4 and the steel pipe gallery 1, and the distance between the center of the first perforation and the center of the second perforation is in the range:
0≤L≤(h/L)，
wherein h is the distance between the ground 2 and the outer surface of the top of the steel pipe gallery 1, and L is the distance between the center of the first perforation and the center of the second perforation.
According to above-mentioned mode to the central axis of people's pipe 3 and throw the contained angle between the central axis of material pipe 4 and the distance between the first fenestrate center and the fenestrate center of second prescribe a limit to, can effectively guarantee steel pipe gallery 1's structural strength, reduce the node and build the influence that causes steel pipe gallery 1's structural strength.
Preferably, the invention provides a composite node structure of a steel pipe gallery, wherein the inner diameter range of the mantube 3 is as follows:
φ mantube ≥1000mm，
Wherein phi is Mantube The inner diameter of the mantube 3;
the inner diameter range of the feeding pipe 4 is as follows:
φ feeding pipe The outer diameter of the pipeline 7 to be thrown in the feeding pipe 4 is more than or equal to +200mm,
wherein phi is Feeding pipe The inner diameter of the feeding pipe 4.
According to the mode, the inner diameters of the manduct 3 and the feeding pipe 4 are limited, the smooth entering and exiting of the manduct 3 by workers can be effectively guaranteed, and the pipeline 7 to be fed can be smoothly fed through the feeding pipe 4.
Preferably, as shown in fig. 1, the present invention provides a composite node structure of a steel pipe gallery, wherein an annular waterproof boss 8 is convexly arranged on the periphery of the ground 2 surrounding the opening, and the waterproof boss 8 is used for preventing rainwater from flowing backward into the human pipe 3, the feeding pipe 4 and the steel pipe gallery 1.
Compared with the prior art, the invention has the following advantages:
according to the invention, the reinforcing structures are arranged among the manduct, the feeding pipe and the steel pipe gallery, so that the influence on the structural strength of the steel pipe gallery in the node construction process can be effectively reduced, and meanwhile, the upper ends of the manduct and the feeding pipe are communicated with the same opening on the ground, so that the number of openings on the ground can be effectively reduced, and therefore, ground obstacles are reduced.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (7)
1. The composite node structure of the steel pipe gallery is characterized in that the composite node structure of the steel pipe gallery is arranged between the ground and the steel pipe gallery, the composite node structure of the steel pipe gallery comprises a manhole pipe, a feeding pipe and a reinforcing structure, a hole is formed in the ground, the upper end of the manhole pipe and the upper end of the feeding pipe are communicated with the hole, the lower end of the manhole pipe and the lower end of the feeding pipe respectively penetrate through the steel pipe gallery and are communicated with the inside of the steel pipe gallery, an included angle is formed between the manhole pipe and the feeding pipe, and the reinforcing structure is arranged among the manhole pipe, the feeding pipe and the steel pipe gallery;
the upper end of the feeding pipe penetrates through the side wall of the manhole pipe and is communicated with the opening through the upper end of the manhole pipe;
the reinforcing structure is arranged in a space formed by enclosing the steel pipe gallery, the manhole pipe and the feeding pipe, and is fixedly connected with the outer surface of the steel pipe gallery, the outer surface of the manhole pipe and the outer surface of the feeding pipe respectively;
the reinforcing structure is one or a combination of a reinforcing plate, a reinforcing plate net and a reinforcing rib.
2. The composite node structure of a steel pipe gallery according to claim 1, wherein the mantube is disposed perpendicular to the ground, and an inner diameter of the mantube is equal to a bore diameter of the open hole.
3. A composite node structure of a steel pipe gallery according to claim 1 or 2, wherein the intersection of the central axis of the mantube with the central axis of the feed pipe is in the plane of or above the ground.
4. The composite node structure of the steel pipe gallery of claim 1 or 2, wherein the inside of the mantube is provided with a ladder extending from the upper end of the mantube to the inner bottom surface of the steel pipe gallery in the axial direction of the mantube.
5. The composite node structure of a steel pipe gallery according to claim 1, wherein the included angle between the central axis of the mantube and the central axis of the feeding tube is in the range of:
arccotμ≤α＜90°，
mu is a friction factor between a pipeline to be fed into the feeding pipe and the inner wall of the feeding pipe, and alpha is an included angle between the central axis of the feeding pipe and the central axis of the human pipe.
6. The composite node structure of the steel pipe gallery according to claim 1, wherein a joint of the lower end of the mantube and the steel pipe gallery forms a first perforation, a joint of the feeding tube and the steel pipe gallery forms a second perforation, and a distance between a center of the first perforation and a center of the second perforation ranges from:
0≤L≤（h/L），
wherein h is a distance between the ground and the outer surface of the top of the steel pipe gallery, and L is a distance between the center of the first perforation and the center of the second perforation.
7. The composite node structure of a steel pipe gallery according to claim 1, wherein the inner diameter range of the mantube is:
φ mantube ≥1000mm，
Wherein phi is Mantube Is the inner diameter of the human tube;
the inner diameter range of the feeding pipe is as follows:
φ feeding pipe The outer diameter of the pipeline to be fed in the feeding pipe is more than or equal to +200mm,
wherein phi is Feeding pipe Is that it isThe inner diameter of the feeding pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711324358.XA CN107938703B (en) | 2017-12-13 | 2017-12-13 | Composite node structure of steel pipe gallery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711324358.XA CN107938703B (en) | 2017-12-13 | 2017-12-13 | Composite node structure of steel pipe gallery |
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| Publication Number | Publication Date |
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| CN107938703A CN107938703A (en) | 2018-04-20 |
| CN107938703B true CN107938703B (en) | 2023-01-31 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2014227A (en) * | 1978-02-10 | 1979-08-22 | Shaw C B | Improvements in Building Construction |
| CN102660961A (en) * | 2012-06-06 | 2012-09-12 | 上海市城市建设设计研究总院 | Integral underground comprehensive pipe rack |
| CN205171548U (en) * | 2015-10-13 | 2016-04-20 | 天津业和科技有限公司 | Novel plastics piping lane |
| CN205296224U (en) * | 2016-01-12 | 2016-06-08 | 上海市城市建设设计研究总院 | Air intake, hoist and mount mouthful and mouthful combined layout's utility tunnel node structure of fleing |
| CN205604295U (en) * | 2016-04-07 | 2016-09-28 | 上海市政工程设计研究总院（集团）有限公司 | Utility tunnel dog -house structure |
| CN206110172U (en) * | 2016-08-29 | 2017-04-19 | 中国市政工程华北设计研究总院有限公司 | Compact municipal administration utility tunnel feed opening |
| CN107059919A (en) * | 2017-03-09 | 2017-08-18 | 中冶东方工程技术有限公司 | A kind of underground pipe gallery |
-
2017
- 2017-12-13 CN CN201711324358.XA patent/CN107938703B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2014227A (en) * | 1978-02-10 | 1979-08-22 | Shaw C B | Improvements in Building Construction |
| CN102660961A (en) * | 2012-06-06 | 2012-09-12 | 上海市城市建设设计研究总院 | Integral underground comprehensive pipe rack |
| CN205171548U (en) * | 2015-10-13 | 2016-04-20 | 天津业和科技有限公司 | Novel plastics piping lane |
| CN205296224U (en) * | 2016-01-12 | 2016-06-08 | 上海市城市建设设计研究总院 | Air intake, hoist and mount mouthful and mouthful combined layout's utility tunnel node structure of fleing |
| CN205604295U (en) * | 2016-04-07 | 2016-09-28 | 上海市政工程设计研究总院（集团）有限公司 | Utility tunnel dog -house structure |
| CN206110172U (en) * | 2016-08-29 | 2017-04-19 | 中国市政工程华北设计研究总院有限公司 | Compact municipal administration utility tunnel feed opening |
| CN107059919A (en) * | 2017-03-09 | 2017-08-18 | 中冶东方工程技术有限公司 | A kind of underground pipe gallery |
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|---|---|
| CN107938703A (en) | 2018-04-20 |
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