WO2024036675A1 - Purline with two-layer flanges and method for preparing same - Google Patents
Purline with two-layer flanges and method for preparing same Download PDFInfo
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- WO2024036675A1 WO2024036675A1 PCT/CN2022/118293 CN2022118293W WO2024036675A1 WO 2024036675 A1 WO2024036675 A1 WO 2024036675A1 CN 2022118293 W CN2022118293 W CN 2022118293W WO 2024036675 A1 WO2024036675 A1 WO 2024036675A1
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000008719 thickening Effects 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D21/00—Combined processes according to methods covered by groups B21D1/00 - B21D19/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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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
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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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
- 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
- E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
- E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D12/00—Non-structural supports for roofing materials, e.g. battens, boards
Definitions
- the present invention relates to the technical field of building profiles, and in particular to a double-layer flange purlin and a preparation method thereof.
- Purlins also called purlins and stringers, are generally used for light steel roofs and walls with large spans and small loads.
- Existing cold-formed thin-walled purlins mostly adopt a design structure in which the flange and web thickness are consistent.
- the shear load-bearing capacity of the web is relatively high. There is no need to use a web that is too thick, but the wing However, the flexural bearing capacity of the edge needs to be improved.
- the purpose of the present invention is to propose a purlin and a preparation method thereof that can effectively increase the cross-sectional moment of inertia through reasonable distribution of materials.
- the present invention proposes a double-layer flange purlin.
- the flanges of the purlin are folded to form a double-layer flange; the folded steel plates of the double-layer flange are fixed by local welding.
- purlins include “C”-shaped purlins, “Z”-shaped purlins and “H”-shaped cross-section purlins.
- the invention also proposes a processing technology for double-layer flange purlins, which includes the following steps:
- Step 1 Prepare a flat steel plate for purlin preparation
- Step 2 Cold bend and fold the two ends of the flat steel plate to form folded double-layer flanges
- Step 3 During the folding process of the double-layer flange, the edge of the folded steel plate is raised to reserve a welding position;
- Step 4 Use welding equipment to extend between the two steel plates of the double-layer flange and locally weld the folded parts of the two steel plates;
- Step 5 After welding, flatten the steel plate with the flange portion raised to achieve the preparation of double-layer flange purlins;
- Step 6 Cold bend the steel plate into the required "Z" or "C” cross-section form.
- the advantage of the present invention is that this technical solution mainly achieves the effect of thickening the flange by folding the flange of the cold-formed steel in half and partially welding it.
- this technical solution can achieve an increase in the moment of inertia of 1.15 to 1.4 times that of traditional purlins without increasing the material used for the purlins.
- This technical solution adopts a folding method to thicken the purlin flange. It does not require complicated preparation processes. It can be achieved by cold bending, flange folding and local flange welding of traditional flat steel plates. The increase in manufacturing cost is limited, and the product The economical improvement brought by performance is significant.
- Figure 1 is a schematic structural diagram of a purlin with a "Z"-shaped double-layer flange in an embodiment of the present invention
- Figure 2 is a schematic structural diagram of the purlin of the "C"-shaped double-layer flange in the embodiment of the present invention
- Figure 3 is a schematic diagram of the manufacturing process of double-layer flange purlins in an embodiment of the present invention.
- the present invention proposes a double-layer flange purlin.
- the flanges of the purlin are folded to form a double-layer flange 1; the folded steel plates of the double-layer flange 1 are fixed by local welding.
- purlins include but are not limited to purlins with "C”, “Z” and “H” cross-sections. As long as the flange of the purlin is folded to enhance its moment of inertia, all design The design concept is the same as this technical solution.
- Step 1 Prepare a flat steel plate for purlin preparation
- Step 2 Cold bend and fold the two ends of the flat steel plate to form double-layer folded flanges
- Step 3 During the flange folding process, the double-layer flange 1 is folded and the edge of the steel plate is raised, leaving a welding position 2;
- Step 4 Use the welding equipment to extend between the two steel plates of the double-layer flange and locally weld the folded parts of the two steel plates;
- Step 5 After welding, flatten the steel plate with the flange part raised to prepare a double-layer flange.
- Step 6 Shape the above-mentioned plate with double-layer folding flange into the required "Z” or "C” type purlin;
- the double-layer flange design of this technical solution enhances the bending moment of inertia of the purlins; through local welding of the double-layer flange steel plates, the purlins of the double-layer flanges form an integral force, and under the ultimate stress condition, no It will explode to ensure that the double-layer flange will not split and its load-bearing capacity will be guaranteed.
- the technical solution of this application greatly reduces the amount of steel used compared with the existing purlins with the same moment of inertia. .
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Roof Covering Using Slabs Or Stiff Sheets (AREA)
Abstract
A purline with two-layer flanges (1) and a method for preparing same. Flanges of the purline are each folded to form a two-layer flange (1), and folded steel plates of the two-layer flange (1) are partially welded and fixed to each other. In the present technical solution, the flanges of cold-formed section steel are folded in half, such that the effect of thickening the flanges is achieved. Compared with a purline with uniform material, the anti-bending inertia moment of the purline is effectively increased in the present technical solution, without increasing the amount of steel used in the purline. Similarly, compared with a purline having the same inertia moment, the amount of steel used in the purline in the present technical solution is greatly reduced. In addition, the two-layer steel plates of the flange are partially welded, such that the purline with the two-layer flange (1) is stressed as a whole to ensure that the two-layer flange (1) does not split, thereby ensuring the bearing capacity thereof. In a machining method in the present technical solution, the simple processes of cold bending, welding and folding are mainly used for preparation, such that an increase in manufacturing costs is limited, thereby significantly improving the economy brought by the product performance.
Description
本发明涉及建筑型材技术领域，尤其涉及一种双层翼缘的檩条及其制备方法。The present invention relates to the technical field of building profiles, and in particular to a double-layer flange purlin and a preparation method thereof.
檩条也称为檩子、桁条，一般用于跨度大、荷载小的轻钢屋面和墙面。现有冷弯薄壁檩条多采用翼缘和腹板厚度一致的设计结构，但是由于檩条应用场景的特殊性，腹板的抗剪承载力比较富裕，没有必要用太厚的腹板，但是翼缘的抗弯承载力却有待提高。Purlins, also called purlins and stringers, are generally used for light steel roofs and walls with large spans and small loads. Existing cold-formed thin-walled purlins mostly adopt a design structure in which the flange and web thickness are consistent. However, due to the particularity of purlin application scenarios, the shear load-bearing capacity of the web is relatively high. There is no need to use a web that is too thick, but the wing However, the flexural bearing capacity of the edge needs to be improved.
发明内容Contents of the invention
本发明的目的在于提出一种通过合理分配用料，实现截面惯性矩有效提高的檩条及其制备方法。The purpose of the present invention is to propose a purlin and a preparation method thereof that can effectively increase the cross-sectional moment of inertia through reasonable distribution of materials.
为达到上述目的，本发明提出一种双层翼缘的檩条，所述檩条的翼缘折叠后形成双层翼缘；所述双层翼缘的折叠钢板之间通过局部焊接固定。In order to achieve the above object, the present invention proposes a double-layer flange purlin. The flanges of the purlin are folded to form a double-layer flange; the folded steel plates of the double-layer flange are fixed by local welding.
进一步的，所述檩条包括“C”型檩条、“Z”型檩条和“H”型截面的檩条。Further, the purlins include “C”-shaped purlins, “Z”-shaped purlins and “H”-shaped cross-section purlins.
本发明还提出一种双层翼缘的檩条的加工工艺，包括以下步骤：The invention also proposes a processing technology for double-layer flange purlins, which includes the following steps:
步骤1：准备一块用于制备檩条的平钢板；Step 1: Prepare a flat steel plate for purlin preparation;
步骤2：将所述平钢板的两端冷弯折叠处理，形成折叠双层翼缘；Step 2: Cold bend and fold the two ends of the flat steel plate to form folded double-layer flanges;
步骤3：在双层翼缘折叠过程中，折叠后钢板的边缘部分翘起，预留出焊接位；Step 3: During the folding process of the double-layer flange, the edge of the folded steel plate is raised to reserve a welding position;
步骤4：通过焊接设备，伸入所述双层翼缘的两层钢板之间，对两层钢板的 折叠部位进行局部焊接；Step 4: Use welding equipment to extend between the two steel plates of the double-layer flange and locally weld the folded parts of the two steel plates;
步骤5：焊接后，将翼缘部分翘起的钢板压平，实现双层翼缘檩条的制备；Step 5: After welding, flatten the steel plate with the flange portion raised to achieve the preparation of double-layer flange purlins;
步骤6：将钢板冷弯成型成所需的“Z”或“C”截面形式。Step 6: Cold bend the steel plate into the required "Z" or "C" cross-section form.
与现有技术相比，本发明的优势之处在于：本技术方案主要通过对冷弯型钢的翼缘进行对折、并局部焊接，实现了翼缘加厚的效果，相比于均匀用料的檩条，本技术方案在不增强檩条用料的情况下，实现1.15～1.4倍于传统檩条的惯性矩增强。Compared with the existing technology, the advantage of the present invention is that this technical solution mainly achieves the effect of thickening the flange by folding the flange of the cold-formed steel in half and partially welding it. For purlins, this technical solution can achieve an increase in the moment of inertia of 1.15 to 1.4 times that of traditional purlins without increasing the material used for the purlins.
本技术方案对檩条翼缘的加厚采用折叠的方式，不需要复杂的工艺进行制备，对传统的平钢板进行冷弯、翼缘折叠以及翼缘局部焊接即可实现，制造成本增加有限，产品性能带来的经济性提升显著。This technical solution adopts a folding method to thicken the purlin flange. It does not require complicated preparation processes. It can be achieved by cold bending, flange folding and local flange welding of traditional flat steel plates. The increase in manufacturing cost is limited, and the product The economical improvement brought by performance is significant.
图1为本发明实施例中“Z”型双层翼缘的檩条的结构示意图；Figure 1 is a schematic structural diagram of a purlin with a "Z"-shaped double-layer flange in an embodiment of the present invention;
图2为本发明实施例中“C”型双层翼缘的檩条的结构示意图；Figure 2 is a schematic structural diagram of the purlin of the "C"-shaped double-layer flange in the embodiment of the present invention;
图3为本发明实施例中双层翼缘的檩条制造流程示意图。Figure 3 is a schematic diagram of the manufacturing process of double-layer flange purlins in an embodiment of the present invention.
为使本发明的目的、技术方案和优点更加清楚，下面将对本发明的技术方案作进一步地说明。In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be further described below.
如图1所示，本发明提出一种双层翼缘的檩条，檩条的翼缘折叠后形成双层翼缘1；双层翼缘1的折叠钢板之间通过局部焊接固定。As shown in Figure 1, the present invention proposes a double-layer flange purlin. The flanges of the purlin are folded to form a double-layer flange 1; the folded steel plates of the double-layer flange 1 are fixed by local welding.
如图1和图2所示，檩条包括但不限于“C”型、“Z”型和“H”型截面的檩条，只要是对檩条的翼缘进行折叠来增强其惯性矩的设计，均与本技术方案 的设计构思相同。As shown in Figures 1 and 2, purlins include but are not limited to purlins with "C", "Z" and "H" cross-sections. As long as the flange of the purlin is folded to enhance its moment of inertia, all design The design concept is the same as this technical solution.
如图3所示，本技术方案双层翼缘檩条的制备如下：As shown in Figure 3, the preparation of double-layer flange purlins in this technical solution is as follows:
步骤1：准备一块用于制备檩条的平钢板；Step 1: Prepare a flat steel plate for purlin preparation;
步骤2：将平钢板的两端冷弯折叠处理，形成双层折叠翼缘；Step 2: Cold bend and fold the two ends of the flat steel plate to form double-layer folded flanges;
步骤3：翼缘折叠过程中，双层翼缘1，折叠后钢板的边缘部分翘起，预留出焊接位2；Step 3: During the flange folding process, the double-layer flange 1 is folded and the edge of the steel plate is raised, leaving a welding position 2;
步骤4：通过焊接设备，伸入双层翼缘的两层钢板之间，对两层钢板的折叠部位进行局部焊接；Step 4: Use the welding equipment to extend between the two steel plates of the double-layer flange and locally weld the folded parts of the two steel plates;
步骤5：焊接后，将翼缘部分翘起的钢板压平，实现双层翼缘的制备。Step 5: After welding, flatten the steel plate with the flange part raised to prepare a double-layer flange.
步骤6：将上述已经形成双层折叠翼缘的板材，成型成为需要的“Z”或“C”型檩条；Step 6: Shape the above-mentioned plate with double-layer folding flange into the required "Z" or "C" type purlin;
本技术方案的双层翼缘设计，增强了檩条的抗弯惯性矩；通过对翼缘双层钢板的局部焊接，使得双层翼缘的檩条形成整体受力，在极限受力状况下，不会炸开，保证双层翼缘不会分裂，保证其承载力。The double-layer flange design of this technical solution enhances the bending moment of inertia of the purlins; through local welding of the double-layer flange steel plates, the purlins of the double-layer flanges form an integral force, and under the ultimate stress condition, no It will explode to ensure that the double-layer flange will not split and its load-bearing capacity will be guaranteed.
下面将通过具体的分析方法以及实验数据，对本技术方案双层翼缘檩条的技术效果进行说明。The technical effects of the double-layer flange purlins of this technical solution will be explained below through specific analysis methods and experimental data.
Z型、C型、H型截面，翼缘和腹板绕X轴的惯性矩对比分析如下：Comparative analysis of the moment of inertia of Z-type, C-type, and H-type cross-sections, flange and web around the X-axis is as follows:
Ix＝b*Tf*Hw^2/4*2+Tw*h^3/12Ix＝b*Tf*Hw^2/4*2+Tw*h^3/12
Af＝2*b*Tf(包括上下翼面积合计)Af=2*b*Tf (including the total area of the upper and lower wings)
Aw＝Tw*HwAw＝Tw*Hw
则：Ix＝Hw^2/4*(Af+Aw/3)Then: Ix=Hw^2/4*(Af+Aw/3)
通过上述的的公式进行理论分析，同样的材料，用在翼缘上，对惯性矩的贡献，是均匀分布在腹板上的3倍。Through theoretical analysis based on the above formula, the same material, used on the flange, contributes three times to the moment of inertia than evenly distributed on the web.
接下来，以附图1中的“Z”型檩条为实施例，通过具体的实验参数进行分析；Next, take the "Z" type purlin in Figure 1 as an example and analyze it through specific experimental parameters;
表1Table 1
通过表1中双层翼缘檩条和同面积等厚檩条的对比可以看出：对比例之间存在腹板厚度和翼缘厚度两个变量，三个对比例的抗弯惯性矩分别相差：15.97％、16.33％和16.98％；抵抗矩相差：15.08％、16.38％和17.04％。From the comparison between double-layer flange purlins and equal-thickness purlins of the same area in Table 1, it can be seen that there are two variables, web thickness and flange thickness, between the comparative examples. The bending moment of inertia of the three comparative examples differs by: 15.97 %, 16.33% and 16.98%; the difference in resistance moment is: 15.08%, 16.38% and 17.04%.
在同等用钢量的前提下，本技术方案的抗弯惯性矩明显优于现有的檩条，也就是说本申请的技术方案，相比于同惯性矩的现有檩条大大减少了用钢量。Under the premise of the same amount of steel, the bending moment of inertia of this technical solution is significantly better than that of the existing purlins. That is to say, the technical solution of this application greatly reduces the amount of steel used compared with the existing purlins with the same moment of inertia. .
上述仅为本发明的优选实施例而已，并不对本发明起到任何限制作用。任何所属技术领域的技术人员，在不脱离本发明的技术方案的范围内，对本发明揭露的技术方案和技术内容做任何形式的等同替换或修改等变动，均属未脱离本发明的技术方案的内容，仍属于本发明的保护范围之内。The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any person skilled in the technical field who makes any form of equivalent substitution or modification to the technical solutions and technical contents disclosed in the present invention shall not deviate from the technical solutions of the present invention. The contents still fall within the protection scope of the present invention.
Claims (3)
- 一种双层翼缘的檩条，其特征在于，所述檩条的翼缘折叠后形成双层翼缘；所述双层翼缘的折叠钢板之间通过局部焊接固定。A double-layer flange purlin is characterized in that the flange of the purlin is folded to form a double-layer flange; and the folded steel plates of the double-layer flange are fixed by local welding.
- 根据权利要求1所述的双层翼缘的檩条，其特征在于，所述檩条包括“C”型、“Z”型和“H”型截面的檩条。The double-layer flange purlin according to claim 1, characterized in that the purlin includes “C”-shaped, “Z”-shaped and “H”-shaped cross-section purlins.
- 一种双层翼缘的檩条的加工工艺，制备如权利要求1所述的双层翼缘的檩条，其特征在于，包括以下步骤：A processing technology for double-layer flange purlins to prepare the double-layer flange purlins as claimed in claim 1, characterized in that it includes the following steps:步骤1：准备一块用于制备檩条的平钢板；Step 1: Prepare a flat steel plate for purlin preparation;步骤2：将所述平钢板的两端冷弯折叠处理，形成折叠双层翼缘；Step 2: Cold bend and fold the two ends of the flat steel plate to form folded double-layer flanges;步骤3：在双层翼缘折叠过程中，折叠后钢板的边缘部分翘起，预留出焊接位；Step 3: During the folding process of the double-layer flange, the edge of the folded steel plate is raised to reserve a welding position;步骤4：通过焊接设备，伸入所述双层翼缘的两层钢板之间，对两层钢板的折叠部位进行局部焊接；Step 4: Use welding equipment to extend between the two steel plates of the double-layer flange and locally weld the folded parts of the two steel plates;步骤5：焊接后，将翼缘部分翘起的钢板压平，实现双层翼缘檩条的制备；Step 5: After welding, flatten the steel plate with the flange portion raised to achieve the preparation of double-layer flange purlins;步骤6：将钢板冷弯成型成所需的“Z”或“C”截面形式。Step 6: Cold bend the steel plate into the required "Z" or "C" cross-section form.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222179557.9 | 2022-08-18 | ||
| CN202210993178.5A CN115217226A (en) | 2022-08-18 | 2022-08-18 | Purline with double-layer flanges and preparation method thereof |
| CN202210993178.5 | 2022-08-18 | ||
| CN202222179557 | 2022-08-18 |
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| Publication Number | Publication Date |
|---|---|
| WO2024036675A1 true WO2024036675A1 (en) | 2024-02-22 |
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|---|---|---|---|
| PCT/CN2022/118293 WO2024036675A1 (en) | 2022-08-18 | 2022-09-13 | Purline with two-layer flanges and method for preparing same |
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| CN1218751A (en) * | 1997-11-10 | 1999-06-09 | 达纳公司 | Side rail for vehicle frame assembly |
| US6073414A (en) * | 1997-06-12 | 2000-06-13 | Dale Industries, Inc. | Light gauge metal truss system |
| CN101484650A (en) * | 2006-05-30 | 2009-07-15 | 里希特系统有限商业两合公司 | Sheet metal section for dry construction |
| CN101708513A (en) * | 2009-05-25 | 2010-05-19 | 北方工业大学 | Process for forming and welding closed-end cold-bent section steel |
| WO2011009204A1 (en) * | 2009-07-22 | 2011-01-27 | Best Joist Inc. | Roll formed steel beam |
| CN109972787A (en) * | 2019-04-18 | 2019-07-05 | 安钢集团华德重工装备有限公司 | The high-strength building crossbeam of one kind and its preparation facilities |
| WO2020149752A1 (en) * | 2019-01-19 | 2020-07-23 | Narloch Marek | Structural section |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6073414A (en) * | 1997-06-12 | 2000-06-13 | Dale Industries, Inc. | Light gauge metal truss system |
| CN1218751A (en) * | 1997-11-10 | 1999-06-09 | 达纳公司 | Side rail for vehicle frame assembly |
| CN101484650A (en) * | 2006-05-30 | 2009-07-15 | 里希特系统有限商业两合公司 | Sheet metal section for dry construction |
| CN101708513A (en) * | 2009-05-25 | 2010-05-19 | 北方工业大学 | Process for forming and welding closed-end cold-bent section steel |
| WO2011009204A1 (en) * | 2009-07-22 | 2011-01-27 | Best Joist Inc. | Roll formed steel beam |
| WO2020149752A1 (en) * | 2019-01-19 | 2020-07-23 | Narloch Marek | Structural section |
| CN109972787A (en) * | 2019-04-18 | 2019-07-05 | 安钢集团华德重工装备有限公司 | The high-strength building crossbeam of one kind and its preparation facilities |
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