CN115095015A - Structural joint for intersecting box-shaped steel components with hyperbolic special-shaped structures and uniform sections - Google Patents
Structural joint for intersecting box-shaped steel components with hyperbolic special-shaped structures and uniform sections Download PDFInfo
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- CN115095015A CN115095015A CN202210609948.1A CN202210609948A CN115095015A CN 115095015 A CN115095015 A CN 115095015A CN 202210609948 A CN202210609948 A CN 202210609948A CN 115095015 A CN115095015 A CN 115095015A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 25
- 239000010959 steel Substances 0.000 title claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims description 25
- 238000010276 construction Methods 0.000 claims 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012545 processing Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 238000005452 bending Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 241001270131 Agaricus moelleri Species 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000003351 stiffener Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
-
- 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
- E04B1/2403—Connection details of the elongated load-supporting parts
- E04B2001/2406—Connection nodes
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a structural joint for intersecting box-shaped steel members with equal sections of a hyperbolic special-shaped structure, which comprises a main rod piece and a secondary rod piece, wherein the sections of the main rod piece and the secondary rod piece are equal, the structural joint also comprises a single-side section expanding joint, the single-side section expanding joint comprises a rectangular rod and a side wall plate, the rectangular rod and the side wall plate are respectively connected with one main rod piece, the secondary rod piece is connected with one side wall plate; according to the invention, through the arrangement of the single-side section expansion joint, the side wall area of the main rod piece is expanded, the problem of intersecting and staggered joints is solved, and the building appearance effect is improved.
Description
Technical Field
The invention relates to the field of building steel structures, in particular to a through structural joint for box-shaped steel members with hyperbolic special-shaped structures and equal sections.
Background
In some double-curved-profile steel structure designs, the problem of staggered joints at intersecting positions of box-shaped steel members due to equal sections when the side walls of the primary and secondary rod members intersect is often encountered. Therefore, in order to solve the problems in the deepening process of the drawing of the steel structure, a 'drum node' method is usually adopted to solve the problem of intersecting and staggered secondary bars. The drum node is a connecting node with the width and the thickness larger than those of the main rod piece is arranged at the intersection of the main rod piece and the secondary rod piece, and the connecting node is connected with the main rod piece through a plurality of transition connecting plates. The method has the advantages that the nodes have various working procedures and low processing efficiency in the processing process, and the appearance of the formed building is poor. Therefore, how to improve the processing efficiency and the building appearance effect under the condition of effectively solving the problem of staggered joints at the intersecting parts caused by equal cross sections when the side walls of the primary rod piece and the secondary rod piece intersect is a subject worthy of research.
Disclosure of Invention
The invention aims to overcome the defects of multiple processing procedures, low processing efficiency and poor building appearance caused by the problem that the cross staggered opening of a secondary rod piece is solved by expanding the section of the side wall of a main rod piece in the prior art, and provides a structural node for the intersection of box-shaped steel components with the sections of a hyperbolic special-shaped structure and the like.
The purpose of the invention is realized by the following steps:
a structural joint for intersecting box-shaped steel members with uniform sections of hyperbolic special-shaped structures comprises a main rod piece and a secondary rod piece, wherein the sections of the main rod piece and the secondary rod piece are equal, the structural joint further comprises a single-side section expanding joint, the single-side section expanding joint comprises a v-shaped rod and a side wall plate, a bottom plate of the v-shaped rod is bent downwards or the v-shaped rod is bent upwards, a top plate of the v-shaped rod is bent upwards to form a convex-shaped structure, the side wall plate is of a convex-shaped plate structure and is arranged on the opening side of the v-shaped rod, the 21274, the cross sections of two ends of the v-shaped rod and the side wall plate are equal to the section of the main rod piece after the v-shaped rod and the side wall plate are connected together, the two ends of the v-shaped rod and the side wall plate are respectively aligned and connected with one main rod piece, and the secondary rod piece is connected with the side wall plate.
The middle part of a bottom plate of the utility model 21274is bent downwards to form a convex structure, and the bottom plate comprises a bottom straight section in the middle and two bottom inclined sections positioned at two ends of the bottom straight section.
The utility model discloses a three-dimensional roof, including back straight section, two end slope sections, back straight section, back slope section, back straight section, back slope, back plane.
The distance between the bottom straight section and the top plate is greater than the width of the secondary rod piece, and the distance between the two reinforcing stiffening plates is greater than the thickness of the secondary rod piece.
The middle part of a top plate of the V-shaped rod is bent upwards to form a convex-shaped structure, and the top plate comprises a middle flat-top straight section and two top inclined sections positioned at two ends of the flat-top straight section.
The v-shaped rod 21274is internally provided with two reinforcing stiffening plates which are perpendicular to the bottom plate and respectively arranged at the joint of the top flat straight section and the two top inclined sections.
The distance between the flat-pushing straight section and the bottom plate is larger than the width of the secondary rod piece, and the distance between the two reinforcing stiffening plates is larger than the thickness of the secondary rod piece.
Has the positive and beneficial effects that: 1. according to the invention, through the arrangement of the single-side section expansion joint, the side wall area of the main rod piece is expanded, the problem of intersecting and staggered joints is solved, and the building appearance effect is improved. 2. Compared with the drum node, the invention has the advantages of simple manufacture, convenient bending of the bottom plate and the top plate, assembly line processing, high processing efficiency and less welding operation. 3. The bending sizes of the bottom plate and the top plate are determined by the size and the angle of the secondary rod piece in the drawing deepening process, so that the use of steel can be effectively reduced, and the waste of the steel is reduced.
Drawings
FIG. 1 is a schematic structural view of example 1 of the present invention;
fig. 2 is a schematic structural view of a single-sided cross-section enlarged node according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a single-sided cross-sectional enlarged joint of embodiment 1 of the present invention with a side wall plate removed;
FIG. 4 is a schematic structural view of a v-shaped rod of example 1 of the present invention;
FIG. 5 is a schematic structural view of example 2 of the present invention;
fig. 6 is a schematic structural view of a single-sided cross-section enlarged node according to embodiment 2 of the present invention;
FIG. 7 is a schematic structural view of a single-sided cross-sectional enlarged joint of embodiment 2 of the present invention with a side wall plate removed;
fig. 8 is a schematic structural view of a v-shaped rod 21274according to embodiment 2 of the present invention.
In the figure, the following steps are carried out: the single-side cross section expanded joint comprises a main rod member 1, single-side cross section expanded joints 2, 21274, a shape rod 3, a bottom plate 4, a bottom flat straight section 401, a bottom inclined section 402, a top plate 5, a top flat straight section 501, a top inclined section 502, secondary rod members 6, reinforcing stiffening plates 7 and side wall plates 8.
The specific implementation mode is as follows:
the following further description is made with reference to the accompanying drawings and specific examples:
example 1
As shown in fig. 1, the intersecting structural node for the box-shaped steel member with the uniform cross section of the hyperbolic special-shaped structure comprises a main rod member 1, a secondary rod member 6 and a single-side cross section expanding node 2, wherein the main rod member 1 and the secondary rod member 6 are both of square tube structures, the cross sections of the main rod member 1 and the secondary rod member 6 are equal, and the equal cross sections mean that the shapes and the sizes of the cross sections are the same. The secondary rod 6 is connected with the primary rod 1 by a single-sided cross-sectional enlarged node 2.
As shown in fig. 2, 3 and 4, the single-sided cross-sectional enlarged node 2 comprises a v-21274, a shaped bar 3, side wall panels 8 and reinforcing stiffener panels 7. 21274h, the middle part of the bottom plate 4 of the rod 3 is bent downwards, and the bent bottom plate 4 consists of a middle bottom straight section 401 and two bottom inclined sections 402 positioned at two ends of the bottom straight section 401. The middle part of the bottom plate 4 is bent downwards, and the v-shaped rod 3 is in an inverted convex structure when viewed from the open side of the v-shaped rod 3. The side wall plate 8 is also in the form of a raised plate structure, the shape and size of which are matched with the open side of the v-shaped rod 3, and the side wall plate 8 is welded to the open side of the v-shaped rod 3. 21274h, the cross section of the two ends of the rod 3 is equal to that of the main rod member 1 after the rod and the side wall plate 8 are welded together, and the equal cross section means that the cross section has the same shape and size. The utility model discloses a v 21274the shape pole 3 has welded in it has two reinforcing stiffening plate 7, and these two reinforcing stiffening plate 7 are all perpendicular to roof 5, and these two reinforcing stiffening plate 7 weld respectively in the handing-over department of bottom straight section 401 and two end slope sections 402. Through the arrangement of the two reinforcing stiffening plates 7, the strength of the single-side section expanding node 2 is improved, namely the strength of the invention is improved.
As shown in fig. 1, both ends of the one-side sectional enlargement node 2 are connected to one main bar member 1, specifically, 21274, and both ends of the shape bar 3 and the side wall plate 8 are connected to one main bar member 1 in alignment. The sub-bars 6 are connected to the side wall plates 8. In order that the reinforcing stiffening plates 7 do not obstruct the intersection of the secondary bars 6 with the side wall plates 8, the distance between the bottom flat straight section 401 and the top plate 5 is greater than the width of the secondary bars 6, and the distance between two reinforcing stiffening plates 7 is greater than the thickness of the secondary bars 6.
Example 2
As shown in fig. 5, the intersecting structural node for the box-shaped steel member with the uniform cross section of the hyperbolic special-shaped structure comprises a main rod member 1, a secondary rod member 6 and a single-side cross section expanding node 2, wherein the main rod member 1 and the secondary rod member 6 are both of square tube structures, the cross sections of the main rod member 1 and the secondary rod member 6 are equal, and the equal cross sections mean that the shapes and the sizes of the cross sections are the same. The secondary bar 6 is connected to the primary bar 1 by a single-sided cross-sectional enlargement joint 2.
As shown in fig. 6, 7 and 8, the single-sided cross-sectional enlarged node 2 includes a v-21274, a shaped bar 3, side wall panels 8 and reinforcing stiffener panels 7. The middle part of the top plate 5 of the v-shaped rod 3 is bent upwards, and the bent top plate 5 consists of a middle top flat straight section 501 and two top inclined sections 502 positioned at two ends of the top flat straight section 501. The middle part of the top plate 5 is bent upwards, and the v-shaped rod 3 is in a convex structure when viewed from the opening side of the v-shaped rod 3. The side wall plate 8 is also in the form of a raised plate structure, the shape and size of which are matched with the open side of the v-shaped rod 3, and the side wall plate 8 is welded to the open side of the v-shaped rod 3. 21274h, the cross section of the two ends of the rod 3 is equal to that of the main rod member 1 after the rod and the side wall plate 8 are welded together, and the equal cross section means that the cross section has the same shape and size. The utility model discloses a v 21274the shape pole 3 has welded in it has two reinforcing stiffening plate 7, and these two reinforcing stiffening plate 7 are all perpendicular to bottom plate 4, and these two reinforcing stiffening plate 7 weld respectively in the junction of flat straight section 501 in top and two top slope sections 502. Through the arrangement of the two reinforcing stiffening plates 7, the strength of the single-side section expanding node 2 is improved, namely the strength of the invention is improved.
As shown in fig. 5, both ends of the single-sided cross-sectional enlarged node 2 are connected to one main bar member 1, specifically, 21274, and both ends of the c-shaped bar 3 and the sidewall plate 8 are connected to one main bar member 1 in alignment. The sub-bars 6 are connected to the side wall plates 8. In order to prevent the reinforcing stiffening plates 7 from obstructing the penetration of the secondary bars 6 and the side wall plates 8, the distance between the top flat straight section 501 and the bottom plate 4 is greater than the width of the secondary bars 6, and the distance between the two reinforcing stiffening plates 7 is greater than the thickness of the secondary bars 6.
The working principle of the invention is as follows: the invention aims to enlarge the side wall area of a main rod piece 1 and solve the problem of stagger at intersecting positions, and a unilateral section enlarged node 2 is arranged at an intersecting node of the main rod piece 1. The single-side section expanding node 2 comprises a v-21274, a shape rod 3 and a side wall plate 8, a v-21274, wherein the middle of a bottom plate 4 of the v-21274is bent downwards or the middle of a top plate 5 of the v-21274is bent upwards to form a convex shape before the shape rod 3 and the side wall plate 8 are welded, and the bent positions and angles of the bottom plate 4 or the top plate 5 ensure that the sections of the side wall plates 8 meet the intersecting condition of a secondary rod piece 6 after the side wall plates 8 are closed. The shape and size of the side wall plate 8 are matched with the opening side of the v-shaped rod 3 after the bottom plate 4 or the top plate 5 is bent, and the side wall plate can be determined and processed after the bottom plate 4 or the top plate 5 is bent. The unilateral cross-sectional enlargement joint 2, in comparison with a conventional "drum joint", corresponds to an increase in the lateral wall area of the main bar 1 on one side only. Therefore, the single-side cross section expansion joint 2 is arranged, so that the side wall area of the main rod piece 1 is expanded, the problem of intersecting and staggered openings is solved, and the building appearance effect is improved. Compared with the drum node, the invention has the advantages of simple manufacture, convenient bending of the bottom plate 4 and the top plate 5, assembly line processing, high processing efficiency and less welding operation. In addition, the bending sizes of the bottom plate 4 and the top plate 5 are determined by the size and the angle of the secondary rod piece 6 in the drawing deepening process, so that the use of steel can be effectively reduced, and the waste of the steel is reduced.
Example 3
Compared with the embodiment 1 and the embodiment 2, the embodiment does not only bend the bottom plate 4 or the top plate 5 independently, but bends the bottom plate 4 downwards and bends the top plate 5 upwards, so that the side wall plate 8 is in a shape of Chinese character 'zhong', the secondary rod piece with larger section size can penetrate through the primary rod piece conveniently, and the application range of the invention can be effectively improved. In the present embodiment, threaded through holes are provided in the bottom flat section 401 of the bottom plate 4 and the top flat section 501 of the top plate 5, and pre-positioning bolts are mounted in the threaded through holes. Thus, when the secondary member 6 is connected with the side wall plate 8 in a penetrating manner, two pre-positioning bolts can be uniformly screwed to position the secondary member 6 first and then weld and connect the secondary member 6 with the side wall plate 8, so that the secondary member 6 can be connected with the side wall plate 8 in a penetrating manner more conveniently and accurately.
According to the invention, through the arrangement of the single-side section expansion joint, the side wall area of the main rod piece is expanded, the problem of intersecting and staggered joints is solved, and the building appearance effect is improved; compared with the drum node, the invention has the advantages of simple manufacture, convenient bending of the bottom plate and the top plate, assembly line processing, high processing efficiency and less welding operation; the bending sizes of the bottom plate and the top plate are determined by the size and the angle of the secondary rod piece in the drawing deepening process, so that the use of steel can be effectively reduced, and the waste of the steel is reduced.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A structural joint for intersecting box-shaped steel members with equal sections of hyperbolic special-shaped structures comprises a main rod piece (1) and a secondary rod piece (6), wherein the sections of the main rod piece (1) and the secondary rod piece (6) are equal, and the structural joint is characterized by further comprising a single-side section expansion joint (2), the single-side section expansion joint (2) comprises a v-21274, a shaped rod (3) and a side wall plate (8), a bottom plate (4) of the v-21274the shaped rod (3) is bent downwards or the v-21274, a top plate (5) of the shaped rod (3) is bent upwards to form a convex-shaped structure, the side wall plate (8) is of a convex-shaped plate structure, the side wall plate (8) is arranged at the opening side of the v-21274, the shaped rod (3) and the side wall plate (8) are connected together, the sections of the two ends of the v-21274, the shaped rod (3) and the side wall plate (8) are equal to the section of the main rod piece (1), and the two ends of the v-743 and the side wall plate (8) are respectively aligned with one main rod piece (1), the secondary rod piece (6) is connected with the side wall plate (8).
2. The intersecting construction node for the box-shaped steel component with the constant-section hyperbolic special-shaped structure is characterized in that the middle of a bottom plate (4) of the shaped rod (3) is bent downwards to form a convex-shaped structure, and the bottom plate (4) comprises a middle bottom straight section (401) and two bottom inclined sections (402) at two ends of the bottom straight section (401).
3. The intersecting construction joint for the hyperbolic special-shaped structure constant-section box steel components as claimed in claim 2, wherein two reinforcing stiffening plates (7) are arranged in the v-shaped rod (3), the two reinforcing stiffening plates (7) are perpendicular to the top plate (5), and the two reinforcing stiffening plates (7) are respectively arranged at the intersection of the bottom flat straight section (401) and the two bottom inclined sections (402).
4. A intersecting construction joint for hyperbolic profile-structured constant-section box steel members, according to claim 3, characterized in that the distance between the bottom straight section (401) and the top plate (5) is greater than the width of the secondary rods (6), and the distance between two said reinforcing stiff plates (7) is greater than the thickness of the secondary rods (6).
5. The intersecting construction joint for the hyperbolic special-shaped structure constant-section box steel components is characterized in that the middle of a top plate (5) of the shaped rod (3) is bent upwards to form a convex-shaped structure, and the top plate (5) comprises a middle top flat straight section (501) and two top inclined sections (502) positioned at two ends of the top flat straight section (501).
6. The intersecting construction joint for the hyperbolic special-shaped structure constant-section box steel components is characterized in that two reinforcing stiffening plates (7) are arranged in the V-shaped rod (3), the two reinforcing stiffening plates (7) are perpendicular to the bottom plate (4), and the two reinforcing stiffening plates (7) are respectively arranged at the joint of the top flat straight section (501) and the two top inclined sections (502).
7. A intersecting construction node for a box steel member with double curved profile structure and constant section according to claim 6, characterized in that the distance between the flat top section (501) and the bottom plate (4) is larger than the width of the secondary rods (6), and the distance between two said stiffening plates (7) is larger than the thickness of the secondary rods (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210609948.1A CN115095015A (en) | 2022-05-31 | 2022-05-31 | Structural joint for intersecting box-shaped steel components with hyperbolic special-shaped structures and uniform sections |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210609948.1A CN115095015A (en) | 2022-05-31 | 2022-05-31 | Structural joint for intersecting box-shaped steel components with hyperbolic special-shaped structures and uniform sections |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115095015A true CN115095015A (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210609948.1A Pending CN115095015A (en) | 2022-05-31 | 2022-05-31 | Structural joint for intersecting box-shaped steel components with hyperbolic special-shaped structures and uniform sections |
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|---|---|
| CN (1) | CN115095015A (en) |
Citations (8)
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|---|---|---|---|---|
| JP2008190147A (en) * | 2007-02-01 | 2008-08-21 | Nippon Steel Corp | Joint metal for steel house, and structure and method for joining structural material for steel house |
| CN101775845A (en) * | 2010-01-14 | 2010-07-14 | 华南理工大学建筑设计研究院 | Torsion crossed welding intersected node of steel component with rectangular cross section |
| CN205259360U (en) * | 2015-12-25 | 2016-05-25 | 安徽伟宏钢结构集团股份有限公司 | Hollow bulging node of space grid structural welding |
| CN207553296U (en) * | 2017-11-29 | 2018-06-29 | 中博建设工程集团有限公司 | A kind of heavy wall penetrates through box steel column node |
| CN207829159U (en) * | 2017-12-06 | 2018-09-07 | 北京城建集团有限责任公司 | A kind of node structure of space lattice |
| CN211369066U (en) * | 2019-11-07 | 2020-08-28 | 上海祥谷钢结构工程有限公司 | Steel construction collects node with transition fillet |
| CN113305507A (en) * | 2021-05-21 | 2021-08-27 | 浙江东南网架股份有限公司 | Method for processing welded box with fillet |
| CN215330544U (en) * | 2021-05-21 | 2021-12-28 | 浙江东南网架股份有限公司 | Take fillet welding box |
-
2022
- 2022-05-31 CN CN202210609948.1A patent/CN115095015A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008190147A (en) * | 2007-02-01 | 2008-08-21 | Nippon Steel Corp | Joint metal for steel house, and structure and method for joining structural material for steel house |
| CN101775845A (en) * | 2010-01-14 | 2010-07-14 | 华南理工大学建筑设计研究院 | Torsion crossed welding intersected node of steel component with rectangular cross section |
| CN205259360U (en) * | 2015-12-25 | 2016-05-25 | 安徽伟宏钢结构集团股份有限公司 | Hollow bulging node of space grid structural welding |
| CN207553296U (en) * | 2017-11-29 | 2018-06-29 | 中博建设工程集团有限公司 | A kind of heavy wall penetrates through box steel column node |
| CN207829159U (en) * | 2017-12-06 | 2018-09-07 | 北京城建集团有限责任公司 | A kind of node structure of space lattice |
| CN211369066U (en) * | 2019-11-07 | 2020-08-28 | 上海祥谷钢结构工程有限公司 | Steel construction collects node with transition fillet |
| CN113305507A (en) * | 2021-05-21 | 2021-08-27 | 浙江东南网架股份有限公司 | Method for processing welded box with fillet |
| CN215330544U (en) * | 2021-05-21 | 2021-12-28 | 浙江东南网架股份有限公司 | Take fillet welding box |
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