CN108894430B - Construction method for reinforcing steel structure beam or column - Google Patents
Construction method for reinforcing steel structure beam or column Download PDFInfo
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- CN108894430B CN108894430B CN201810931438.XA CN201810931438A CN108894430B CN 108894430 B CN108894430 B CN 108894430B CN 201810931438 A CN201810931438 A CN 201810931438A CN 108894430 B CN108894430 B CN 108894430B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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- 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
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/32—Columns; Pillars; Struts of metal
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- 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
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B2001/2466—Details of the elongated load-supporting parts
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- Physics & Mathematics (AREA)
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- Rod-Shaped Construction Members (AREA)
Abstract
The invention relates to a construction method for reinforcing a steel structure beam or column, wherein the beam or column adopts basic section steel, and the construction steps comprise: first, the following components were prepared: 4U-shaped channel steel; the basic section steel consists of an upper flange, a lower flange and a web plate; secondly, installing U-shaped channel steel: respectively inserting 4U-shaped channel steels into four corners of an upper flange and a lower flange of the basic section steel, arranging the U-shaped channel steels along the through length of the basic section steel, fixing the U-shaped channel steels and the basic section steel, and forming a pore passage for penetrating the prestressed tendon between the U-shaped channel steels and the flange; thirdly, prestress is applied by passing prestressed tendons through the 4-corner hole channels of the basic steel. By adopting the construction method, the bending resistance/pressure bearing capacity and the torsion resistance bearing capacity of the beam/column can be improved simultaneously, and the construction method has good effect on strengthening the torsion resistance bearing capacity of the steel structure side column and the side beam.
Description
Technical Field
The invention belongs to the field of constructional engineering, and particularly relates to a construction method for reinforcing a steel structure beam or column.
Background
CN 105926974A discloses a steel structure composite beam for increasing the bearing capacity of an existing steel beam, wherein an auxiliary steel beam is arranged below the existing steel beam in parallel, an anchorage device and at least one gravitational support frame are arranged between the existing steel beam and the auxiliary steel beam, one end of the auxiliary steel beam is fixed, the other end of the auxiliary steel beam is connected with a force application device or a fastening device is arranged on the auxiliary steel beam, the existing steel beam, the auxiliary steel beam and the anchorage device are firmly connected, and the steel structure composite beam for increasing the bearing capacity is formed together with the fastening device and the gravitational support frame. The steel structure composite beam can be used for reinforcing the existing steel beam on site under the current engineering situation, the method is simple and easy to implement, the structure of the steel structure composite beam is simple, and the engineering design and use requirements can be met. The combination of the steel structure and the steel strand in the above documents can improve the flexural bearing capacity of the beam, but the prior art has no technical scheme related to how the steel strand improves the torsional bearing capacity in the structure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a construction method for reinforcing a steel structure beam or column, and aims to reinforce the torsional bearing capacity of the beam/column.
The technical scheme of the invention is as follows: a construction method for reinforcing a steel structure beam or column, wherein the beam or column adopts basic section steel, and the construction steps comprise: first, the following components were prepared: 4U-shaped channel steel; the basic section steel consists of an upper flange, a lower flange and a web plate; secondly, installing U-shaped channel steel: respectively inserting 4U-shaped channel steels into four corners of an upper flange and a lower flange of the basic section steel, arranging the U-shaped channel steels along the length of the basic section steel, fixing the U-shaped channel steels and the basic section steel, and forming a pore passage for penetrating the prestressed tendon between the U-shaped channel steels and the flange; thirdly, prestress is applied by passing prestressed tendons through the 4-corner hole channels of the basic steel.
Further, bolt holes are preset between the flanges of the U-shaped channel steel and the basic section steel, the bolt holes in the flanges of the U-shaped channel steel and the basic section steel are aligned, and the U-shaped channel steel and the basic section steel are fixed through the bolt and nut assemblies.
Further, in the first step, when the component is prepared, vertical steel pipes are respectively welded on the left side and the right side of an upper flange and a lower flange of the basic section steel, the flanges protrude from two ends of each vertical steel pipe, the height of each vertical steel pipe is larger than the thickness of each flange, and each vertical steel pipe is hollow; the distance between the vertical steel pipes is 15-50 cm; secondly, when the U-shaped channel steel is installed, the U-shaped channel steel is inserted from the front of the basic section steel, the side surfaces of the two sides of the flange of the U-shaped channel steel, which are inserted into the flange, are provided with bulges, and the U-shaped channel steel and the part of the vertical steel pipe, which protrudes out of the flange, are matched with each other so as to position the mutual positions of the U-shaped channel; the upper surface and the lower surface of the U-shaped channel steel correspond to the vertical steel pipes, and holes are formed in the upper surface and the lower surface of the U-shaped channel steel and the vertical steel pipes, and the U-shaped channel steel and the vertical steel pipes are fixed through bolt and nut assemblies.
Further, in the second step, in installing U type channel-section steel, still include: installing an upper outer side plate and a lower outer side plate, wherein the upper outer side plate is arranged on the outer sides of the flanges of the 2U-shaped channel steels of the upper flange; the lower outer side plate is arranged on the outer side of the flange of each of the 2U-shaped channel steels on the upper flange.
Further, in the second step, in installing U type channel-section steel, still include: and the upper inner side plate and the lower inner side plate are arranged between one end of the flange inner side of the U-shaped channel steel of the upper flange and the lower flange and the web plate respectively.
Further, 4 inner side plates and webs are formed
And (4) shaping.
Further, in the second step, in installing U type channel-section steel, still include: install left side board and right side board, left side board and right side board are parallel with the web, and the U type channel steel of basis shaped steel web both sides is connected through left side board and right side board respectively, goes up outer panel and left side board and right side limit down and makes the U type channel steel connection at 4 angles form "mouthful" font.
Further, the basic section steel is I-shaped steel, the upper flange and the lower flange are the same in structure, the prestressed reinforcing steel adopts prestressed steel strands, and the beam or the column is a side beam or a side column
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: 1. the flanges of the beam/column are formed by a combined method: namely, the basic steel and the channel steel are formed; 2. the prestressed tendons are arranged at the 4 corners of the section steel, so that the anti-torsion bearing capacity can be improved while the anti-bending/pressure bearing capacity is improved; 3. when the beam and the column are twisted, a space curve can be formed by U-shaped channel steel and internal prestress under the action of torque, the length of the prestressed tendon can be further stretched, the prestressed tendon can exert force on the channel steel in the radial direction while being pulled, and the channel steel is connected with a flange of the basic section steel together, so that the beam/the column is restrained from being twisted; 4. the combined flange adopts a mode that the basic section steel is externally connected with the bolt steel pipe, so that the positioning connection between the channel steel and the flange is convenient, and the stability of the channel steel and the flange is ensured; 5. the invention is not only suitable for newly-built steel structure engineering, but also suitable for reinforcing the built engineering.
Description of the drawings:
FIG. 1: the structure of the first embodiment is schematically installed.
FIG. 2: the bolt and nut assembly and the U-shaped channel steel of the first embodiment are installed in detail.
FIG. 3: the third embodiment is a structural installation schematic diagram.
FIG. 4: the structure installation of the fourth embodiment is schematically shown.
FIG. 5: and (3) a schematic diagram of the deformation of the steel strand when the steel strand is twisted.
FIG. 6: the stress of the steel strand and the basic section steel is schematically shown.
Detailed Description
Example 1: as shown in fig. 1-2, a construction method for reinforcing a steel structure boundary beam, wherein the beam or column adopts basic steel, comprises the following construction steps:
first, a member is prepared: basic steel, 4U-shaped channel steels 1-1, 1-2, 1-3 and 1-4; the basic section steel is I-shaped steel and consists of an upper flange 2-1, a lower flange 2-2 and a web plate 3, and the upper flange 2-1 and the lower flange 2-2 have the same structure;
secondly, inserting 4U-shaped channel steels into four corners of an upper flange and a lower flange of the basic section steel, presetting bolt holes between the U-shaped channel steel and the flange of the basic section steel, aligning the U-shaped channel steel with the bolt holes of the flange of the basic section steel, and fixing the U-shaped channel steel and the flange of the basic section steel through bolt and nut assemblies 1-5; a pore passage 4 for penetrating the prestressed tendon is formed between the U-shaped channel steel and the flange;
thirdly, a prestressed tendon passes through a pore channel at the 4 corners of the basic steel and is applied with prestress; the prestressed reinforcing steel adopts prestressed steel strands; the prestressed steel strands are anchored to the columns on both sides of the beam.
Example 2: a construction method for reinforcing a steel structure side column is different from that of the embodiment 1 in that: the basic section steel is a column; the prestressed steel strands are anchored at the upper and lower ends of the column.
Example 3: as shown in fig. 3, a construction method for reinforcing a steel structure beam or column, wherein the beam or column uses basic section steel, comprises the following construction steps:
first, a member is prepared: basic steel, 4U-shaped channel steels 1-1, 1-2, 1-3 and 1-4; the basic section steel is I-shaped steel and consists of an upper flange 2-1, a lower flange 2-2 and a web plate 3, and the upper flange 2-1 and the lower flange 2-2 have the same structure; welding vertical steel pipes 1-7 on the left side and the right side of an upper flange and a lower flange of the basic section steel respectively, wherein the flanges protrude from two ends of each vertical steel pipe, the height of each vertical steel pipe is larger than the thickness of each flange, and each vertical steel pipe is hollow; the distance between the vertical steel pipes is 15-50 cm;
secondly, inserting 4U-shaped channel steels into four corners of an upper flange and a lower flange of the basic section steel, presetting bolt holes between the U-shaped channel steel and the flange of the basic section steel, aligning the U-shaped channel steel with the bolt holes of the flange of the basic section steel, and fixing the U-shaped channel steel and the flange of the basic section steel through bolt and nut assemblies 1-6; a pore passage 4 for penetrating the prestressed tendon is formed between the U-shaped channel steel and the flange;
the U-shaped channel steel is inserted from the front of the basic section steel, the side surfaces of two sides of the U-shaped channel steel, which are inserted into the flange, are provided with bulges, and the U-shaped channel steel is matched with the part of the vertical steel pipe, which protrudes out of the flange, so as to position the mutual positions of the U-shaped channel steel and the flange; holes are formed in the parts, corresponding to the vertical steel pipes, of the upper surface and the lower surface of the U-shaped channel steel, and the U-shaped channel steel and the vertical steel pipes are fixed through bolt and nut assemblies;
welding an upper outer side plate 2-1-2, an upper inner side plate 2-1-3 and a lower outer side plate 2-1-3, wherein the upper outer side plate is arranged on the outer sides of the flanges of 2U-shaped channel steels on the upper flange; the lower outer side plate is arranged on the outer sides of the flanges of the 2U-shaped channel steels of the lower flange; the upper inner side plate and the lower inner side plate are respectively arranged between one end of the flange inner side of the U-shaped channel steel of the upper flange and the lower flange and the web plate.
Thirdly, a prestressed tendon passes through a pore channel at the 4 corners of the basic steel and is applied with prestress; the prestressed reinforcing steel adopts prestressed steel strands.
Example 4: the difference from example 3 is that: the U-shaped channel steel is connected with the left side plate and the right side plate 2-1-4 which are parallel to the web plate; the U-shaped channel steel with 4 corners is connected to form a square shape, and the torsion resistance bearing capacity of the beam/column is further improved.
Example 5: the difference from example 3 is that: the upper and lower inner side plates are connected with the web plate by adopting a diagonal bracing mode, and 4 inner side plates of the block are formed by the web plate
The shape can be more favorable to the wholeness of U type channel-section steel and basic shaped steel, is favorable to the improvement of antitorque bearing capacity.
Firstly, the U-shaped channel steel, the upper outer side plate, the lower outer side plate, the left side plate and the right side plate form a square shape, the square shape can improve the anti-torsion bearing capacity, the design is easy to understand from the mechanics, namely, an anti-torsion member is additionally arranged on the I-shaped steel, and the U-shaped channel steel is arranged at the four corners of the basic section steel, the anti-torsion deformation is maximum, so that the anti-torsion bearing capacity can be improved to the maximum extent by arranging the square shape at the position; secondly, for the prestressed steel strands, if the prestressed steel strands are not longitudinally arranged in the U-shaped channel steel, the effect is that the lengths of the steel strands are only elongated, and the steel strands are straight lines; however, when the prestressed steel strand is arranged in the U-shaped channel, the steel strand twists along with the U-shaped channel under the action of torque, unlike the case where the U-shaped channel is not arranged, the steel strand at this time is a curve, and when the prestressed steel strand is changed into a curve by an external force, the prestressed steel strand inevitably generates a radial force, and the magnitude of the radial force is related to the degree of deformation. As shown in FIG. 6, the radial force acts on the basic steel sections F1, F2, F3, F4 and F1-F4 as a shear force, and the torsional load capacity is improved.
While the preferred embodiments of the present invention have been described in detail, it should be understood that various changes and modifications of the invention may be effected therein by those skilled in the art after reading the foregoing teachings. Such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (4)
1. A construction method for reinforcing a steel structure beam or column, wherein the beam or column adopts basic section steel, is characterized in that: the construction method comprises the following steps:
first, the following components were prepared: 4U-shaped channel steel; the basic section steel consists of an upper flange, a lower flange and a web plate;
secondly, installing U-shaped channel steel: respectively inserting 4U-shaped channel steels into four corners of an upper flange and a lower flange of the basic section steel, arranging the U-shaped channel steels along the length of the basic section steel, fixing the U-shaped channel steels and the basic section steel, and forming a pore passage for penetrating the prestressed tendon between the U-shaped channel steels and the flange;
in the installation U type channel steel, still include: installing an upper outer side plate and a lower outer side plate, wherein the upper outer side plate is arranged on the outer sides of the flanges of the 2U-shaped channel steels of the upper flange; the lower outer side plate is arranged on the outer sides of the flanges of the 2U-shaped channel steels of the lower flange;
in the installation U type channel steel, still include: installing a left side plate and a right side plate which are parallel to the web, wherein U-shaped channel steels on two sides of the web of the basic profile steel are respectively connected through the left side plate and the right side plate, and the upper outer side plate, the lower outer side plate, the left side plate and the right side plate enable the U-shaped channel steels with 4 corners to be connected to form a square shape;
thirdly, prestress is applied by passing prestressed tendons through the 4-corner hole channels of the basic steel.
2. The construction method of reinforcing a steel structural beam or column according to claim 1, wherein: bolt holes are preset between the flanges of the U-shaped channel steel and the basic section steel, the bolt holes in the flanges of the U-shaped channel steel and the basic section steel are aligned, and the U-shaped channel steel and the basic section steel are fixed through a bolt and nut assembly.
3. The construction method for reinforcing a beam or column with a steel structure as claimed in claim 1, wherein the basic section steel is an i-beam, and the upper flange and the lower flange have the same structure.
4. The construction method of reinforcing a steel structural beam or column according to claim 1, wherein: the prestressed reinforcing steel adopts prestressed steel strands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931438.XA CN108894430B (en) | 2017-01-03 | 2017-01-03 | Construction method for reinforcing steel structure beam or column |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931438.XA CN108894430B (en) | 2017-01-03 | 2017-01-03 | Construction method for reinforcing steel structure beam or column |
| CN201710002701.2A CN106836482B (en) | 2017-01-03 | 2017-01-03 | A kind of construction method for reinforcing steel structure girder or column |
Related Parent Applications (1)
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| CN201710002701.2A Division CN106836482B (en) | 2017-01-03 | 2017-01-03 | A kind of construction method for reinforcing steel structure girder or column |
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| CN108894430A CN108894430A (en) | 2018-11-27 |
| CN108894430B true CN108894430B (en) | 2020-06-16 |
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| CN201810931438.XA Active CN108894430B (en) | 2017-01-03 | 2017-01-03 | Construction method for reinforcing steel structure beam or column |
| CN201810937322.7A Active CN109113262B (en) | 2017-01-03 | 2017-01-03 | Construction method for reinforcing steel structure beam or column |
| CN201710002701.2A Active CN106836482B (en) | 2017-01-03 | 2017-01-03 | A kind of construction method for reinforcing steel structure girder or column |
| CN201810937323.1A Active CN109113263B (en) | 2017-01-03 | 2017-01-03 | Construction method for reinforcing steel structure beam or column |
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| CN201810937322.7A Active CN109113262B (en) | 2017-01-03 | 2017-01-03 | Construction method for reinforcing steel structure beam or column |
| CN201710002701.2A Active CN106836482B (en) | 2017-01-03 | 2017-01-03 | A kind of construction method for reinforcing steel structure girder or column |
| CN201810937323.1A Active CN109113263B (en) | 2017-01-03 | 2017-01-03 | Construction method for reinforcing steel structure beam or column |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107882174B (en) * | 2017-11-23 | 2023-11-07 | 厦门华旸建筑工程设计有限公司 | Hanging beam type steel structure frame |
| CN110258798B (en) * | 2019-07-12 | 2023-10-24 | 浙江东南网架股份有限公司 | Mounting method of assembled column base connection node |
| CN110512350B (en) * | 2019-07-29 | 2021-10-26 | 东华大学 | Bending-proof device for super-long moving beam |
| CN110454168A (en) * | 2019-08-02 | 2019-11-15 | 中国恩菲工程技术有限公司 | Girder steel fixed structure |
| CN111021746B (en) * | 2019-12-25 | 2021-08-03 | 中交鹭建有限公司 | Processing and manufacturing method of light steel truss reinforcing structure |
| CN113266079B (en) * | 2021-06-11 | 2022-12-02 | 浙江明思特建筑支护技术有限公司 | Shaped steel with high joint strength |
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| CH636929A5 (en) * | 1979-04-18 | 1983-06-30 | Pantex Stahl Ag | Lattice girder for the underground track and shaft expansion. |
| JPS60181457A (en) * | 1984-02-28 | 1985-09-17 | 株式会社鴻池組 | Prestressed concrete pillar having pc strand mounted in x-shape therein under tension |
| JP3763575B2 (en) * | 2004-01-07 | 2006-04-05 | 岡田 弘 | Underground beam construction frame and underground beam construction method using the same |
| KR200454452Y1 (en) * | 2008-09-18 | 2011-07-06 | 이재수 | Pillar |
| CN201433509Y (en) * | 2009-06-17 | 2010-03-31 | 中国电子工程设计院 | Prestressed steel girder |
| CN201605825U (en) * | 2009-12-30 | 2010-10-13 | 贵阳铝镁设计研究院 | Steel beam reinforced structure |
| KR101125917B1 (en) * | 2010-02-10 | 2012-03-21 | 서울시립대학교 산학협력단 | Prestressed steel concrete composite beam |
| CN202172553U (en) * | 2011-08-23 | 2012-03-21 | 北京广利核系统工程有限公司 | High-strength quake-proof cabinet |
| JP5774979B2 (en) * | 2011-12-28 | 2015-09-09 | 前田 一峯 | Column structure |
| CN202689332U (en) * | 2012-06-05 | 2013-01-23 | 四川电力设计咨询有限责任公司 | H-shaped steel reinforced structure |
| CN103233525A (en) * | 2013-04-11 | 2013-08-07 | 北京工业大学 | Channel steel assembling type steel structure prestress anti-bending support |
| CN103255877B (en) * | 2013-04-19 | 2015-11-25 | 北京工业大学 | Prefabricated PC honeycombed ribbing web steel beam |
| KR101497212B1 (en) * | 2013-06-03 | 2015-02-27 | 서울시립대학교 산학협력단 | Fiber Reinforced Steel Beam with End Slip Prevention Clamp |
| CN203846507U (en) * | 2014-05-28 | 2014-09-24 | 德清鑫德机械有限公司 | Pre-stress supporting structure for strip-shaped rectangular foundation pit |
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| CN105604241A (en) * | 2015-12-24 | 2016-05-25 | 安徽伟宏钢结构集团股份有限公司 | Steel-structure reinforced beam for construction |
| CN105649202B (en) * | 2016-01-11 | 2018-08-07 | 安徽理工大学 | Prestressing force assembling frame node structure and its construction method |
| CN105926974A (en) * | 2016-01-13 | 2016-09-07 | 关喜才 | Steel structure composite beam capable of improving bearing capacity of existing steel beam |
| CN205534580U (en) * | 2016-01-22 | 2016-08-31 | 中国建筑第八工程局有限公司 | Fastener is used with being connected of structure member to large -scale component |
| CN205591582U (en) * | 2016-04-19 | 2016-09-21 | 郑州大学 | Shaped steel, high -strength steel stranded conductor and polymer mortar reinforcing apparatus |
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| CN205777086U (en) * | 2016-06-08 | 2016-12-07 | 山东萌山钢构工程有限公司 | Fire-proof and thermal-insulation girder steel |
-
2017
- 2017-01-03 CN CN201810931438.XA patent/CN108894430B/en active Active
- 2017-01-03 CN CN201810937322.7A patent/CN109113262B/en active Active
- 2017-01-03 CN CN201710002701.2A patent/CN106836482B/en active Active
- 2017-01-03 CN CN201810937323.1A patent/CN109113263B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106836482A (en) | 2017-06-13 |
| CN109113262A (en) | 2019-01-01 |
| CN106836482B (en) | 2018-11-02 |
| CN109113262B (en) | 2020-08-28 |
| CN109113263A (en) | 2019-01-01 |
| CN108894430A (en) | 2018-11-27 |
| CN109113263B (en) | 2020-07-07 |
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