CN114411955B - Flexible connection structure of structural beam and constructional column - Google Patents
Flexible connection structure of structural beam and constructional column Download PDFInfo
- Publication number
- CN114411955B CN114411955B CN202210225138.6A CN202210225138A CN114411955B CN 114411955 B CN114411955 B CN 114411955B CN 202210225138 A CN202210225138 A CN 202210225138A CN 114411955 B CN114411955 B CN 114411955B
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- constructional column
- sleeve
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- rod
- connection structure
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- 230000001050 lubricating effect Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 239000004519 grease Substances 0.000 claims description 5
- 239000011490 mineral wool Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims 1
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 10
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/025—Structures with concrete columns
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Building Environments (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a flexible connection structure of a structural beam and a constructional column, which comprises a structural beam, the constructional column and a connection assembly, wherein the structural beam comprises an upper beam and a lower beam; the connecting assembly comprises a flexible cushion layer, a sleeve and an embedded rod arranged in the sleeve, the flexible cushion layer is arranged between the bottom of the upper beam and the top end face of the constructional column, the sleeve is vertically and fixedly embedded at the top of the constructional column, the top end of the embedded rod passes through the flexible cushion layer and is fixedly arranged in the upper beam, the outer end of the embedded rod is sleeved with a rubber ring, and the periphery of the rubber ring is in contact with the inner wall of the sleeve. According to the invention, the embedded bars are vertically connected with the sleeve, the flexible cushion layer is arranged between the upper beam and the constructional column, so that a vertical deformation space is provided for the main body, the problem that a beam plate is easy to crack is effectively solved, the embedded bars are arranged in the middle of the beam, the beam edge positions where the reinforcing steel bars are dense are avoided, and the problem that the reinforcing steel bar planting operation in the dense reinforcing steel bar region is difficult is solved.
Description
Technical Field
The invention belongs to the technical field of constructional column connection, and particularly relates to a flexible connection structure of a structural beam and a constructional column.
Background
The constructional column is arranged in the masonry structure for enhancing the integrity and stability of masonry, and is connected with the ring beam to form a space structure capable of resisting bending and shearing. The constructional column and the main body structure are generally connected in two modes, namely, rigid connection and flexible connection. The rigid connection means that the steel bars at the upper end and the lower end of the constructional column are anchored into the beam plates so as to connect the constructional column and the main body structure into a whole, and the method is characterized by increasing the overall stability of masonry. However, the rigid connection will result in an increase in the overall rigidity of the structure, resulting in the structure being subjected to greater seismic forces under the action of an earthquake, resulting in premature failure of structural members or structures, so the advantage of rigid connection of the structural columns to the main structure under the action of an earthquake may become disadvantageous, while the rigid connection will result in additional support of the beam slab, an increase in local hogging moment, and cracking or failure of the beam slab. The other connection mode of the constructional column and the main body structure is flexible connection, namely the constructional column and the main body structure are separated and have a certain gap, so that the masonry itself becomes a secondary structure, the change of the integral rigidity of the structure is avoided, and the shock damage and the beam slab cracking are reduced. At present, masonry mainly exists in Liang Banbian, and reinforcing steel bars are dense at the positions, so that anchoring of the top and the bottom of a constructional column through the reinforcing steel bars becomes very difficult.
Disclosure of Invention
The invention aims to provide a flexible connection structure of a structural beam and a constructional column, which solves the problems that in the background technology, a structural column and a main body structure are easy to crack and the dense operation of reinforcing steel bars in a bar planting area is difficult.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the flexible connection structure of the structural beam and the constructional column comprises a structural beam, the constructional column and a connection assembly, wherein the structural beam comprises an upper beam and a lower beam, the upper end of the constructional column is flexibly connected with the upper beam through the connection assembly, and the lower end of the constructional column is anchored with the lower beam through a longitudinal rib; the connecting assembly comprises a flexible cushion layer, a sleeve and an embedded rod arranged in the sleeve, wherein the flexible cushion layer is arranged between the bottom of the upper beam and the top end surface of the constructional column, the sleeve is vertically and fixedly embedded at the top of the constructional column, the top end of the embedded rod penetrates through the flexible cushion layer and is fixedly arranged in the upper beam, the outer end of the embedded rod is sleeved with a rubber ring, and the periphery of the rubber ring is in contact with the inner wall of the sleeve.
Further, the embedded bars are arranged in a plurality, the embedded bars are uniformly arranged at the middle position of the upper beam at intervals, and the rubber rings are arranged at the bottoms of the embedded bars.
Further, the sleeves are provided with a plurality of corresponding embedded bars, the bottoms of the sleeves are provided with plugs, and the plugs are PVC plugs.
Further, a lubricating layer is filled between the sleeve and the embedded rod, and the lubricating layer is a lubricating grease layer.
Further, the flexible cushion layer is a rock wool layer, a caulking rod is arranged on the periphery of the flexible cushion layer, and the caulking rod is a foam rod.
Further, a sealing layer is arranged on the outer side of the joint filling rod, and the sealing layer is a fireproof sealing glue layer.
Further, a series of encryption stirrups are arranged in the constructional column at intervals from top to bottom in the transverse direction respectively.
Further, the depth of the embedded rod in the upper beam is 1/3-3/4 of the height of the upper beam.
The invention has the following beneficial effects:
1. according to the flexible connection structure of the structural beam and the constructional column, the flexible connection of the beam and the constructional column is realized through the arrangement of the connection assembly, the shock hazard is reduced, the safety of the structure is improved, the vertical connection of the embedded rod and the sleeve is realized, the flexible cushion layer is arranged between the upper beam and the constructional column, the vertical deformation space is provided for the main body, the horizontal movement of the constructional column is limited, the problem that the structural rigidity is increased due to the constructional column in the prior art, but the cracking risk of a beam slab is increased is effectively solved, the embedded rod is arranged in the middle of the beam, the beam edge position of dense reinforcing steel bars is avoided, the problem that the operation of the reinforcing steel bar planting in the dense reinforcing steel bar area is difficult is solved, and the construction difficulty is reduced.
2. According to the flexible connection structure of the structural beam and the constructional column, the flexible cushion layer is arranged between the constructional column and the upper beam, so that a vertical deformation space is provided, partial vibration and impact can be absorbed, and cracks generated in the upper beam are avoided.
3. The flexible connection process of the structural beam and the constructional column is simple, the construction period is further shortened, construction materials are saved, and good economic benefits are achieved.
Drawings
FIG. 1 is a schematic view of the overall structure of a flexible connection structure of a structural beam and a constructional column according to the present invention;
FIG. 2 is a schematic view of the connection structure of the upper beam and the constructional column according to the invention;
FIG. 3 is a schematic view of the connection structure of the underbeam and constructional column according to the present invention;
fig. 4 is a plan view of a constructional column according to the invention.
In the figure: 1-constructional column, 2-structural beam, 21-upper beam, 22-lower beam, 3-embedded rod, 4-sleeve, 5-lubricating layer, 6-rubber ring, 7-plug, 8-sealing layer, 9-joint filling rod, 10-flexible cushion layer, 11-encryption stirrup and 12-longitudinal bar.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-4, the flexible connection structure of a structural beam and a constructional column provided by the invention comprises a structural beam 2, the constructional column 1 and a connection assembly, wherein the structural beam 2 comprises an upper beam 21 and a lower beam 22, the upper end of the constructional column 1 is flexibly connected with the upper beam 21 through the connection assembly, and the lower end is in anchoring connection with the lower beam 22 through a longitudinal rib 12. The connecting assembly comprises a flexible cushion layer 10, a sleeve 4 and an embedded rod 3 arranged in the sleeve 4, a gap is reserved between an upper beam 21 and the constructional column 1, and the flexible cushion layer 10 is arranged in the reserved gap; the sleeve 4 is vertically fixedly arranged at the top of the constructional column 1, the top end of the embedded rod 3 is fixedly arranged in the lower part of the upper beam 21, the bottom end of the embedded rod is inserted into the sleeve 4, the inner diameter of the sleeve 4 is larger than the diameter of the embedded rod 3, the rubber ring 6 is sleeved at the bottom of the embedded rod 3, and the embedded rod 3 is connected with the sleeve 4 through the rubber ring 6.
The top end of the embedded rod 3 is anchored in the upper beam 21 through the bar planting glue, and the embedded rod 3 is phi 18 steel bars. The embedded bars 3 are arranged at a plurality of positions at equal intervals along the length direction of the upper beam 21 at the middle position of the upper beam 21, and the beam edge positions with dense reinforcing steel bars are avoided.
The bottom of the sleeve 4 is sealed by a plug 7, lubricating grease is filled in the sleeve 4 and outside the embedded rod 3 to form a lubricating layer 5, so that no sundries exist in the gap, the vertical movement of the embedded rod 3 in the sleeve 4 is ensured, the sleeve 4 is preferably a phi 20 galvanized steel sleeve, and the plug 7 is a PVC plug. The sleeves 4 are arranged corresponding to the embedded rods 3, so that the connection stability of the upper beam 21 and the constructional column 1 is improved.
The periphery of the flexible cushion layer 10 is plugged by a gap filling rod 9, and a sealing layer 8 is arranged outside the gap filling rod 9; the flexible cushion layer 10 is made of rock wool, the joint filling rod 9 is a foam rod, and the sealing layer 8 is made of fireproof sealant.
The encryption stirrups 11 are respectively arranged in the constructional column 1 at the top and the bottom at intervals from top to bottom transversely so as to improve the shearing resistance of the constructional column 1, and as a preferred mode, the encryption stirrups 11 are arranged in the range of 350mm at the upper part and 350mm at the lower part of the constructional column 1, and the interval between two adjacent encryption stirrups 11 is 50mm.
The construction steps of the flexible connection structure of the structural beam and the constructional column are as follows:
step one: paying off, namely paying out the size position of the constructional column 1 and the position of the embedded rod 3 according to the upper beam 21 and the lower beam 22 according to a design drawing before the constructional column 1 is constructed;
step two: drilling and bar planting, wherein the position of the embedded rod 3 in the upper beam 21 is drilled by adopting a phi 20 drill bit, the drilling depth meets the standard requirement, the drilling is finished, the steel bar is cleaned up and then planted with phi 18, and bar planting is carried out in the same step of the lower beam 22 at the bottom;
step three: a sleeve 4 is fixed, a circle of rubber ring 6 is wound on the lower part of the embedded rod 3 after the bar planting is finished, then the sleeve 4 is inserted upwards from the lower part of the embedded rod 3, the sleeve 4 is fixed by the friction force of the rubber ring 6, and after the sleeve 4 is fixed, a plug 7 is arranged at the bottom of the sleeve 4 and is sealed by glue;
step four: pouring concrete into the constructional column 1, carrying out formwork erection and concrete pouring on the constructional column 1, and carrying out formwork removal and maintenance after the concrete reaches the strength;
step five: injecting lubricating grease, namely injecting the lubricating grease into the gap between the embedded rod 3 and the sleeve 4 to form a lubricating layer 5, so that the gap between the embedded rod 3 and the sleeve 4 is free from sundries, and the vertical movement of the embedded rod 3 in the sleeve 4 is ensured;
step six, plugging gaps, namely plugging rock wool in gaps between the tops of the constructional columns 1 and the upper beams 21 to form flexible cushion layers 10, arranging caulking rods 9 around the rock wool, and plugging the outer sides of the caulking rods 9 by using sealant 8.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (7)
1. The utility model provides a flexible connection structure of structural beam and constructional column, includes structural beam (2), constructional column (1) and coupling assembling, structural beam (2) include upper beam (21) and underbeam (22), its characterized in that: the upper end of the constructional column (1) is flexibly connected with the upper beam (21) through a connecting component, and the lower end of the constructional column is anchored with the lower beam (22) through a longitudinal rib (12); the connecting assembly comprises a flexible cushion layer (10), a sleeve (4) and an embedded rod (3) arranged in the sleeve (4), wherein the flexible cushion layer (10) is arranged between the bottom of an upper beam (21) and the top end surface of a constructional column (1), the sleeve (4) is vertically fixedly embedded at the top of the constructional column (1), the top end of the embedded rod (3) penetrates through the flexible cushion layer (10) and then is fixedly arranged in the upper beam (21), the outer end of the embedded rod (3) is sleeved with a rubber ring (6), and the periphery of the rubber ring (6) is in contact with the inner wall of the sleeve (4);
the inner diameter of the sleeve (4) is larger than the diameter of the embedded rod (3); a plug (7) is arranged at the bottom of the sleeve (4);
a lubricating layer (5) is filled between the sleeve (4) and the embedded rod (3), and the lubricating layer (5) is a lubricating grease layer;
the rubber ring (6) is arranged at the bottom of the embedded rod (3);
when the sleeve (4) is vertically and fixedly buried at the top of the constructional column (1), firstly, a circle of rubber ring (6) is wound at the lower part of the embedded rod (3), then the sleeve (4) is inserted upwards from the lower part of the embedded rod (3), and after the sleeve (4) is fixed, a plug (7) is arranged at the bottom of the sleeve; and then casting the concrete of the constructional column (1).
2. A flexible connection structure of a structural beam and a constructional column as defined in claim 1 wherein: the embedded bars (3) are arranged at a plurality of positions at equal intervals in the middle of the upper beam (21).
3. A flexible connection structure of a structural beam and a constructional column as defined in claim 2 wherein: the sleeve (4) is provided with a plurality of sleeves corresponding to the embedded bars (3), and the plugs (7) are PVC plugs.
4. A flexible connection structure of a structural beam and a constructional column as defined in claim 1 wherein: the flexible cushion layer (10) is a rock wool layer, a caulking rod (9) is arranged on the periphery of the flexible cushion layer, and the caulking rod (9) is a foam rod.
5. A flexible connection structure of a structural beam to a constructional column as defined in claim 4 wherein: and a sealing layer (8) is arranged on the outer side of the joint filling rod (9), and the sealing layer (8) is a fireproof sealing glue layer.
6. A flexible connection structure of a structural beam and a constructional column as defined in claim 1 wherein: a series of encryption stirrups (11) are respectively arranged in the constructional column (1) at the top and the bottom at intervals from top to bottom.
7. A flexible connection structure of a structural beam and a constructional column as defined in claim 1 wherein: the depth of the embedded rod (3) in the upper beam (21) is 1/3-3/4 of the height of the upper beam (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210225138.6A CN114411955B (en) | 2022-03-09 | 2022-03-09 | Flexible connection structure of structural beam and constructional column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210225138.6A CN114411955B (en) | 2022-03-09 | 2022-03-09 | Flexible connection structure of structural beam and constructional column |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114411955A CN114411955A (en) | 2022-04-29 |
| CN114411955B true CN114411955B (en) | 2024-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210225138.6A Active CN114411955B (en) | 2022-03-09 | 2022-03-09 | Flexible connection structure of structural beam and constructional column |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114411955B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115977248A (en) * | 2023-02-04 | 2023-04-18 | 中铁一局集团建筑安装工程有限公司 | Steel structure interlayer and construction process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW494942U (en) * | 2001-04-13 | 2002-07-11 | Chung-Shing Tsai | Absorption device of earthquake energy |
| JP2007327239A (en) * | 2006-06-07 | 2007-12-20 | Sekisui Chem Co Ltd | Base isolation structure on pilotis story |
| WO2018018913A1 (en) * | 2016-07-26 | 2018-02-01 | 东南大学 | Flexible hanging type module building structure |
| CN209339376U (en) * | 2018-12-10 | 2019-09-03 | 信息产业电子第十一设计研究院科技工程股份有限公司 | The flexible connecting structure of masonry filler wall and beam |
| CN209742143U (en) * | 2019-03-27 | 2019-12-06 | 黄梅 | Flexible connection's assembled building wall |
| CN211817000U (en) * | 2020-03-13 | 2020-10-30 | 中冶建工集团有限公司 | Constructional column steel bar positioning mechanism |
| CN214272481U (en) * | 2021-01-07 | 2021-09-24 | 贾一凡 | Novel building structure shock attenuation device |
| CN214497956U (en) * | 2021-02-05 | 2021-10-26 | 中建一局集团第三建筑有限公司 | Brickwork top flexible connection device |
-
2022
- 2022-03-09 CN CN202210225138.6A patent/CN114411955B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW494942U (en) * | 2001-04-13 | 2002-07-11 | Chung-Shing Tsai | Absorption device of earthquake energy |
| JP2007327239A (en) * | 2006-06-07 | 2007-12-20 | Sekisui Chem Co Ltd | Base isolation structure on pilotis story |
| WO2018018913A1 (en) * | 2016-07-26 | 2018-02-01 | 东南大学 | Flexible hanging type module building structure |
| CN209339376U (en) * | 2018-12-10 | 2019-09-03 | 信息产业电子第十一设计研究院科技工程股份有限公司 | The flexible connecting structure of masonry filler wall and beam |
| CN209742143U (en) * | 2019-03-27 | 2019-12-06 | 黄梅 | Flexible connection's assembled building wall |
| CN211817000U (en) * | 2020-03-13 | 2020-10-30 | 中冶建工集团有限公司 | Constructional column steel bar positioning mechanism |
| CN214272481U (en) * | 2021-01-07 | 2021-09-24 | 贾一凡 | Novel building structure shock attenuation device |
| CN214497956U (en) * | 2021-02-05 | 2021-10-26 | 中建一局集团第三建筑有限公司 | Brickwork top flexible connection device |
Non-Patent Citations (1)
| Title |
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| 邹泓荣 ; .填充墙及构造柱顶宜与框架梁底柔性连接(上).建筑工人.2010,(01),全文. * |
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| CN114411955A (en) | 2022-04-29 |
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