Carbon steel welded metal roof system

Abstract

A carbon steel welded metal roof system comprises a first metal roof and a second metal roof which are fixed to a roof structure through supports. The first and second metal roofs respectively comprise a bottom and first and second connecting parts on two sides of the bottom; the first connecting part is of an inverted-U-shaped structure and is bent outwards by 90 degrees from the outer side end of the inverted-U-shaped structure to extend to form a welding connecting part. The second connecting part is of an inverted U-shaped structure with a downward opening; the lower part of the support is L-shaped, and the upper part of the support is inverted U-shaped; the first connecting part of the second metal roof is embedded in the inverted U-shaped structure of the second connecting part of the first metal roof; the upper part of the support is embedded between the first connecting part of the second metal roof and the inverted U-shaped structure of the second connecting part of the first metal roof; the end part of the outer side edge of the inverted U-shaped structure of the second connecting part of the first metal roof is welded with the welding connecting part of the first connecting part of the second metal roof; and after the welded second connecting part of the first metal roof and the first connecting part of the second metal roof are subjected to two times of hemming, a welding seam is hidden in the hemming.

Description

Technical Field

[0001] The utility model relates to the field of building roofs, and particularly relates to a carbon steel welded metal roof system. Background Art

[0002] At present, the welded roof panels are only made of stainless steel, and the resistance penetration welding process is used, resulting in relatively high costs.

[0003] For traditional coated steel plates (galvanized type, color-coated type), since the problem of surface damage after welding has not been solved, there is no welded roof panel product, and only standing seam roof panel products are available.

[0004] GB 55030-2022 "General Code for Waterproofing of Buildings and Municipal Engineering" requires that a flexible waterproof coil must be added to the metal roof. Using a fully welded metal roof is regarded as a grade practice for the first-class waterproofing grade, and there is no need to add a flexible waterproof coil.

[0005] After the new waterproof code came out, traditional standing seam roof panels need to add flexible waterproof coils, which will increase the cost by 30-50 yuan per square meter. However, the new code also clarifies that welded metal roofs can be regarded as equivalent to first-class waterproof roofs and do not require the addition of flexible waterproof coils.

[0006] T / CECS 959-2021 "Technical Standard for Welded Stainless Steel Roof Engineering" specifies that the materials of welded metal roof panels are mainly stainless steel, with grades: 445J1, 445J2, 443, 304L, 304, 316L, 316. The welding process is resistance welding.

[0007] According to the requirements of the above two codes, once the designed roof is a metal roof, traditional standing seam metal roofs must add a layer of flexible waterproof coil. Compared with the previous standing seam metal roofs, before adding the flexible coil, corresponding other materials and safety measures need to be added, and the cost increase per square meter accounts for a relatively large proportion. If the stainless steel welded roof code is implemented, the construction cost of stainless steel welded roofs far exceeds that of traditional standing seam metal roofs, and the customer acceptance is poor. There is an urgent need in the market for an economical welded metal roof panel. Summary of the Invention

[0008] The purpose of the utility model is to provide a carbon steel welded metal roof system, which uses cold-rolled carbon steel to form profiled metal roof panels that meet the design requirements through cold bending forming processing technology, and adopts laser welding connection method to weld and hem the adjacent profiled metal roof panels to form a whole, so that the entire profiled metal roof forms a whole, with excellent wind resistance and waterproof performance.

[0009] To achieve the above purpose, the technical solution of the utility model is:

[0010] A carbon steel welded metal roofing system, which comprises:

[0011] A first metal roofing and a second metal roofing, which are arranged adjacent to each other and fixed on the roofing structure through supports; the first and second metal roofings adopt cold-rolled carbon steel plates, and the first and second metal roofings respectively include bottoms, and a first connecting part and a second connecting part which extend outward from both sides of the bottoms and are bent upward; wherein,

[0012] The first connecting part is an inverted U-shaped structure formed by bending upward from one end of the bottom, then bending inward 90 degrees twice, and a welding connecting part formed by bending outward 90 degrees from the outer end of the inverted U-shaped structure;

[0013] The second connecting part is an inverted U-shaped structure with a downward opening formed by bending upward from the other end of the bottom and then bending outward twice by 90 degrees;

[0014] The support, its lower part is L-shaped, and its upper part is an inverted U-shaped formed by extending upward from the upper end of the lower part and bending outward twice;

[0015] The first connecting part of the second metal roofing is embedded in the inverted U-shaped structure of the second connecting part of the first metal roofing, and the upper part of the support is embedded between the first connecting part of the second metal roofing and the inverted U-shaped structure of the second connecting part of the first metal roofing;

[0016] The outer side end of the inverted U-shaped structure of the second connecting part of the first metal roofing is laser welded to the welding connecting part of the first connecting part of the second metal roofing, so that the second connecting part of the first metal roofing and the first connecting part of the second metal roofing form a closed structure; and, after welding, the second connecting part of the first metal roofing and the first connecting part of the second metal roofing are curled twice to hide the weld inside the curl.

[0017] Preferably, the outer side end of the inverted U-shaped structure of the second connecting part of the first metal roofing is laser welded to the welding connecting part of the first connecting part of the second metal roofing, and the welding connecting part of the first connecting part of the second metal roofing is bent upward to wrap the weld inside the welding connecting part.

[0018] Preferably, the first connecting part includes a base formed by bending horizontally outward from one end of the bottom, a first bent part which is an inverted U-shaped with a downward opening formed by extending from the other side of the base, bending upward, then bending inward 90 degrees and then bending downward 90 degrees, and a welding connecting part formed by bending upward from the lower end of the first bent part to above the base;

[0019] The second connecting part includes a base formed by bending horizontally outward from one end of the bottom, and a second bent part which is an inverted U-shaped with a downward opening formed by extending from one side of the base, bending upward, then bending outward 90 degrees and then bending downward 90 degrees.

[0020] Preferably, the connection mode between the outer side end of the inverted U-shaped structure of the second connection part of the first metal roof and the welding connection part of the first connection part of the second metal roof is a laser welding mode.

[0021] Preferably, the first metal roof and the second metal roof are formed by a cold bending forming process.

[0022] Preferably, the thickness of the cold-rolled carbon steel plate is 0.45 mm to 0.8 mm.

[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0024] 1) For the first time, fillet welds are used for continuous welding on the traditional carbon steel standing seam metal roof panel, connecting the metal roofs into one body to improve the wind resistance and waterproof performance.

[0025] 2) For the first time, a laser welding process is used to weld continuous fillet welds on the traditional carbon steel standing seam metal roof panel, connecting the metal roofs into one body to improve the wind resistance, waterproof performance and corrosion resistance. It is found through testing that the galvanized aluminum-magnesium steel plate has good weldability. In the welding test, the welds have not rusted after more than 2000 hours of salt spray test without any protection, meeting the requirements in many aspects such as current use and specifications.

[0026] 3) After the seams are locked on the traditional carbon steel standing seam metal roof panel, the welds are hidden between the metal panel and the support, and the welds are not directly exposed to the atmosphere, avoiding contact with media such as the atmosphere, ultraviolet rays, and rainwater. Further, in actual applications, the welds are protected from premature rusting and failure, improving the service life of the metal roof panel and the welds. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0028] Figures 2 to 6 is a schematic diagram of the connection state of the first and second metal roofs in an embodiment of the present utility model;

[0029] Figure 7 is a schematic structural diagram of the first metal roof in an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Referring to Figures 1 to 7 , the carbon steel welded metal roof system of the present utility model includes:

[0031] The first metal roof 1 and the second metal roof 2 are arranged adjacent to each other and fixed on the roof structure through the support 3; the first and second metal roofs 1 and 2 are made of cold-rolled carbon steel plates, and the first and second metal roofs 1 and 2 respectively include bottoms 11 and 21, and first connecting parts 12 and 22, and second connecting parts 13 and 23 that extend outward from both sides of the bottoms 11 and 21 and are bent upward; among them,

[0032] The first connecting parts 12 and 22 are inverted U-shaped structures formed by bending upward from one end of the bottom 11, extending, and then bending inward twice by 90 degrees, and welding connecting parts 123 and 223 are formed by bending outward 90 degrees from the outer ends of the inverted U-shaped structures;

[0033] The second connecting parts 13 and 23 are inverted U-shaped structures with openings downward formed by bending upward from the other ends of the bottoms 11 and 21 and then bending outward twice by 90 degrees;

[0034] The support 3 has an L-shaped lower part 31 and an inverted U-shaped upper part 32 formed by extending upward from the upper end of the lower part 31 and bending outward twice;

[0035] The first connecting part 22 of the second metal roof 2 is embedded in the inverted U-shaped structure of the second connecting part 13 of the first metal roof 1, and the upper part 32 of the support 3 is embedded between the first connecting part 21 of the second metal roof 2 and the inverted U-shaped structure of the second connecting part 13 of the first metal roof 1;

[0036] The outer side end of the inverted U-shaped structure of the second connecting part 13 of the first metal roof 1 is laser welded to the welding connecting part of the first connecting part 21 of the second metal roof 2, so that the second connecting part 13 of the first metal roof 1 and the first connecting part 21 of the second metal roof 2 are connected to form a closed structure; and, after welding, the second connecting part 13 of the first metal roof 1 and the first connecting part 22 of the second metal roof 2 are curled twice to hide the weld 4 inside the curl.

[0037] Preferably, the outer side end of the inverted U-shaped structure of the second connecting part 13 of the first metal roof 1 is laser welded to the welding connecting part 223 of the first connecting part 22 of the second metal roof 2, and the welding connecting part 223 of the first connecting part 22 of the second metal roof 2 is bent upward to wrap the weld 4 inside the welding connecting part 223.

[0038] Preferably, the first connecting part 12 (taking the first metal roof 1 as an example, the same below) includes a base part 121 formed by bending and extending horizontally outward from one end of the bottom 11, a first bending part 122 formed by bending upward, then inward by 90 degrees, and then downward by 90 degrees to form an inverted U-shape with an opening downward, extending from the lower end of the first bending part 122 upward and bending toward the upper part of the base part 121 to form a welding connecting part 123;

[0039] The second connecting part 13 includes a base part 131 formed by horizontally bending and extending outward from one side end of the bottom part 11. After extending from one side of the base part 131, it bends upward and then bends outward by 90 degrees and then bends downward by 90 degrees to form a second bending part 132 with an opening downward and an inverted U shape.

[0040] Preferably, the connection mode between the outer side end of the inverted U-shaped structure of the second connecting part of the first metal roof and the welding connection part of the first connecting part of the second metal roof is a laser welding mode.

[0041] Preferably, the thickness of the cold-rolled carbon steel plate is 0.45 mm to 0.8 mm.

[0042] Preferably, the first metal roof and the second metal roof are formed by a cold bending and forming process.

Claims

1. A carbon steel welded metal roofing system, characterized in that, Including: A first metal roof and a second metal roof, which are arranged adjacent to each other and fixed on the roof structure through supports; The first and second metal roofs are made of cold-rolled carbon steel plates. The first and second metal roofs respectively include bottoms, and a first connecting portion and a second connecting portion that extend outward from both sides of the bottoms and are bent upward; wherein, The first connecting portion is an inverted U-shaped structure formed by bending upward from one end of the bottom, then bending inward 90 degrees twice, and a welding connecting portion formed by bending outward 90 degrees from the outer end of the inverted U-shaped structure; The second connecting portion is an inverted U-shaped structure with a downward opening formed by bending upward from the other end of the bottom and then bending outward twice by 90 degrees; The support, the lower part of which is L-shaped, and the upper part of which is an inverted U-shaped formed by extending upward from the upper end of the lower part and bending outward twice; The first connecting portion of the second metal roof is embedded in the inverted U-shaped structure of the second connecting portion of the first metal roof, and the upper part of the support is embedded between the first connecting portion of the second metal roof and the inverted U-shaped structure of the second connecting portion of the first metal roof; The outer edge end of the inverted U-shaped structure of the second connecting portion of the first metal roof is welded to the welding connecting portion of the first connecting portion of the second metal roof, so that the second connecting portion of the first metal roof and the first connecting portion of the second metal roof form a closed structure; and, after welding, the second connecting portion of the first metal roof and the first connecting portion of the second metal roof are curled twice to hide the weld inside the curl.

2. The carbon steel welded metal roofing system according to claim 1, wherein The outer edge end of the inverted U-shaped structure of the second connecting portion of the first metal roof is laser welded to the welding connecting portion of the first connecting portion of the second metal roof, and the welding connecting portion of the first connecting portion of the second metal roof is bent upward to wrap the weld inside the welding connecting portion.

3. The carbon steel welded metal roof system according to claim 1, wherein The first connecting portion includes a base portion formed by bending horizontally outward from one end of the bottom, a first bending portion that is an inverted U-shaped with a downward opening formed by extending from the other side of the base portion, bending upward, then bending inward 90 degrees and then bending downward 90 degrees, and a welding connecting portion formed by bending upward from the lower end of the first bending portion to above the base portion; The second connecting portion includes a base portion formed by bending horizontally outward from one end of the bottom, and a second bending portion that is an inverted U-shaped with a downward opening formed by extending from one side of the base portion, bending upward, then bending outward 90 degrees and then bending downward 90 degrees.

4. The carbon steel welded metal roof system according to claim 1 or 2 or 3, characterized in that, The connection mode between the outer edge end of the inverted U-shaped structure of the second connecting portion of the first metal roof and the welding connecting portion of the first connecting portion of the second metal roof is a laser welding mode.

5. The carbon steel welded metal roofing system according to claim 1 or 2 or 3, characterized in that, The first metal roof and the second metal roof are formed by a cold bending forming process.

6. The carbon steel welded metal roof system according to claim 4, characterized in that, The first metal roof and the second metal roof are formed by a cold bending forming process.

7. The carbon steel welded metal roofing system according to claim 1, characterized in that, The thickness of the cold-rolled carbon steel plate is 0.45 mm to 0.8 mm.

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