Roof structure and building

Abstract

Provided in the embodiments of the present disclosure are a roof structure and a building. The roof structure comprises: a gutter comprising a bottom wall and side walls located on two sides of the bottom wall, the side walls being connected to the bottom wall; roof panels, each of which comprises a metal plate layer and a waterproof layer attached to the outer side of the metal plate layer, the roof panels being located on two opposite sides of the gutter; and a waterproof roll covering the bottom wall and the side walls of the gutter, two ends of the waterproof roll respectively extending to and connected to the outer surfaces of the corresponding roof panels. The technical solution of the present disclosure avoids water leakage from the roof and the gutter, and improves the waterproof performance of the roof structure. Moreover, the overall waterproof structure has greater strength and stronger stability, thereby improving the wind-resistant performance of the roof structure and ensuring the stability of the roof structure.

Description

Roof structure and building

[0001] This disclosure claims priority to Chinese patent application number CN2023218510126 filed on July 14, 2023. Technical Field

[0002] The present disclosure relates to the field of construction, and in particular to a roof structure and a building. Background Art

[0003] With the progress and development of science and technology, metal has become a widely used material in the construction industry, especially in the metal roofing industry. Metal steel roofing has become the choice of many owners. However, the waterproofness of metal roofs has a greater impact on metal roofs.

[0004] Metal roofs consist of roof panels and, to meet drainage requirements, gutters. Currently, the most common gutter waterproofing measure involves using eaves plugs and sealants between the roof panels and the gutters. However, metal roof panels can expand and contract due to temperature fluctuations, and sealants age rapidly due to exposure to wind and sun, leading to leaks at the roof gutter joints and impacting indoor production and use.

[0005] Summary of the Invention

[0006] The embodiments of the present disclosure provide a roof structure and a building to solve or alleviate one or more technical problems in the prior art.

[0007] An embodiment of the present disclosure provides a roof structure, comprising:

[0008] The gutter comprises a bottom wall and side walls located on both sides of the bottom wall, the side walls being connected to the bottom wall;

[0009] A roof panel, comprising a metal sheet layer and a waterproof layer attached to the outside of the metal sheet layer, the roof panel being located on opposite sides of the gutter;

[0010] The waterproof roll covers the outer surface of the gutter, and both ends of the waterproof roll extend to the outer surface of the corresponding roof board and are connected to the outer surface of the roof board.

[0011] In some embodiments, both ends of the waterproof membrane are connected to the outer surface of the roof panel by hot air welding.

[0012] In some embodiments, the roof panel includes interconnected crests and troughs along the direction close to the gutter, the troughs are close to the gutter, and both ends of the waterproof membrane extend to the outer surfaces of the corresponding troughs, and are connected to the outer surfaces of the troughs by hot air welding.

[0013] In some embodiments, a first roll covering sheet is further included, which extends from the outer surface of the crest portion to the outer surface of the waterproof roll, one end of the first roll covering sheet is connected to the crest portion by hot air welding, and the other end of the first roll covering sheet is connected to the waterproof roll by hot air welding.

[0014] In some embodiments, the waterproof roll includes a second portion located on the side wall surface, the first roll covering sheet extends from the outer surface of the crest portion to the outer surface of the second portion, and the other end of the first roll covering sheet is connected to the outer surface of the second portion by hot air welding.

[0015] In some embodiments, the waterproof membrane includes a second portion located on the surface of the side wall, the second portion is fixedly connected to the corresponding side wall by screws, and a waterproof pressure strip is provided between the nut of the screw and the waterproof membrane.

[0016] In some embodiments, a second roll material covering sheet is further included, the second roll material covering sheet covers the screws and the waterproof pressure strip, and the outer periphery of the second roll material covering sheet is connected to the waterproof roll material.

[0017] In some embodiments, the waterproof membrane includes a first portion located on the bottom wall surface, the screw is close to the first portion, a portion of the second membrane covering sheet is connected to the second portion by hot air welding, and another portion is connected to the first portion by hot air welding.

[0018] In some embodiments, the waterproof layer is made of thermoplastic polyolefin; and / or the waterproof roll is made of thermoplastic polyolefin.

[0019] An embodiment of the present disclosure further provides a building comprising the roof structure of the present disclosure.

[0020] In the roof structure of the disclosed embodiment, the roof panels are located on opposite sides of the gutter, and the waterproof membrane covers the outer surface of the gutter. The two ends of the waterproof membrane extend to the outer surface of the corresponding roof panel and are connected to the outer surface of the roof panel. In such a roof structure, the junction between the gutter and the roof panel is covered by the waterproof membrane, which prevents the cut section of the roof structure from being exposed and reduces the risk of corrosion of the roof structure from the cut section. The waterproof membrane also covers the outer surface of the gutter and the junction between the gutter and the roof panel. As a result, the gutter and the roof panel are connected by the waterproof membrane to form a sealed waterproof whole, which prevents water leakage from the roof and gutter and improves the waterproof performance of the roof structure. In addition, the structural strength and stability of the waterproof whole are greater, thereby improving the wind resistance of the roof structure and ensuring the stability of the roof structure.

[0021] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present disclosure will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0023] FIG1 is a partial schematic diagram of a roof structure according to an embodiment of the present disclosure;

[0024] FIG2 is a schematic diagram showing a roofing plate and a waterproofing membrane connected via a first membrane covering sheet in a roof structure according to another embodiment of the present disclosure;

[0025] FIG3 is a schematic cross-sectional view of a roof panel according to an embodiment of the present disclosure;

[0026] FIG4 is a schematic diagram showing the connection between the third portion and the trough portion in one embodiment of the present disclosure.

[0027] Explanation of the accompanying reference numerals: 1. Roof panel; 11. Peak portion; 12. Trough portion; 2. Waterproof membrane; 21. First part; 22. Second part; 23. Third part; 3. Screw; 41. First membrane covering sheet; 42. Second membrane covering sheet; 5. Waterproofing strip; 6. Purlin; 7. Gutter; 71. Bottom wall; 72. Side wall; 73. Support arm; 101. Metal plate layer; 102. Waterproof layer; 200. Junction line. DETAILED DESCRIPTION

[0028] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0029] In the related art, the commonly used waterproofing measure for gutters is to use eaves plugs, sealants, etc. between the roof panels and the gutters for roof treatment. This method is prone to leakage in strong winds. After the gutter leaks, repeated repairs cannot eradicate it, which not only affects indoor production and life, but also increases the overall cost of the roof. In addition, during use, the gutter outlet may be blocked by fallen leaves, causing the gutter to flood the roof panels. In addition, the roof panels are usually cut at the gutter position, resulting in a cut section. The cut section has no anti-corrosion treatment and is prone to corrosion.

[0030] In order to solve the problems existing in the gutter in the related art, an embodiment of the present disclosure provides a roof structure.

[0031] Figure 1 is a partial schematic diagram of a roof structure in one embodiment of the present disclosure, and Figure 2 is a schematic diagram of a roof panel and a waterproof membrane in a roof structure in another embodiment of the present disclosure being connected through a first membrane covering sheet. In one embodiment of the present disclosure, as shown in Figures 1 and 2, the roof structure includes a gutter 7, a roof panel 1, and a waterproof membrane 2. The gutter 7 includes a bottom wall 71 and side walls 72 located on both sides of the bottom wall 71, and the bottom wall 71 is connected to the side walls 72. The gutter 7 generally includes a bottom wall 71 and two side walls 72, and the two side walls 72 are respectively connected to both sides of the bottom wall 71 to form the gutter 7. The bottom wall 71 can be flat, as shown in Figure 1. In other embodiments, the bottom wall 71 can also be curved, and the shape of the bottom wall 71 can be set as needed, which is not specifically limited here.

[0032] FIG3 is a schematic cross-sectional view of a roof panel according to an embodiment of the present disclosure. In one embodiment, as shown in FIG3 , the roof panel 1 may include a metal sheet layer 101 and a waterproof layer 102 attached to the outer side of the metal sheet layer. The metal sheet layer 101 may include a metal sheet. The metal sheet may be a steel sheet, an aluminum sheet, or the like. The waterproof layer 102 is attached to the outer side of the metal sheet layer 101. The waterproof layer 102 may be made of thermoplastic polyolefin (TPO), that is, the waterproof layer 102 may be a TPO waterproof layer. The waterproof layer 102 may be attached to the outer surface of the metal sheet layer 101 via an adhesive layer.

[0033] It should be noted that the roof structure in the embodiments of the present disclosure is applied to the roof of a building. Here, "inside" refers to the side facing the interior of the building, and "outside" refers to the side facing the exterior of the building. For example, after the roof panel 1 is applied to the roof structure, the waterproof layer is located on the side facing the exterior of the building, while the metal layer is located on the side facing the interior of the building.

[0034] Roof panels 1 are located on opposite sides of the gutter 7. As shown in FIG1 , a roof panel 1 is provided on the left and right sides of the gutter 7, and the gutter 7 is located between the two roof panels 1. Typically, the roof panel 1 is cut toward the gutter 7, and then the gutter 7 is provided between the two cut roof panels 1.

[0035] The waterproofing membrane 2 covers the bottom and side walls of the gutter 7, thus covering the outer surface of the bottom wall 71 and the outer surfaces of both side walls 72. The ends of the waterproofing membrane 2 extend to and connect with the outer surfaces of the corresponding roof panels 1. As shown in Figure 1, the left end of the waterproofing membrane 2 extends to and connects with the outer surface of the left roof panel 1; the right end of the waterproofing membrane 2 extends to and connects with the outer surface of the right roof panel 1.

[0036] In the roof structure of the disclosed embodiment, the roof panels 1 are located on opposite sides of the gutter 7, and the waterproof membrane 2 covers the outer surface of the gutter 7. The two ends of the waterproof membrane 2 extend to the outer surface of the corresponding roof panels 1 and are connected to the outer surface of the roof panels 1. In such a roof structure, the junction between the gutter 7 and the roof panels 1 is covered by the waterproof membrane 2, which prevents the cut section of the roof structure from being exposed and reduces the risk of corrosion of the roof structure from the cut section. The waterproof membrane 2 also covers the outer surface of the gutter 7 and covers the junction between the gutter 7 and the roof panels 1. As a result, the gutter 7 and the roof panels 1 are connected by the waterproof membrane 2 to form a sealed waterproof whole, which prevents water leakage at the junction of the roof and the gutter 7 and improves the waterproof performance of the roof structure. In addition, the structural strength and stability of the waterproof whole are greater, thereby improving the wind resistance of the roof structure and ensuring the stability of the roof structure.

[0037] In one embodiment, both ends of the waterproof membrane 2 can be respectively bonded to the outer surface of the roof panel 1. In other embodiments, the waterproof membrane 2 and the outer surface of the roof panel 1 can also be connected by other sealing methods.

[0038] In one embodiment, the ends of the waterproof membrane 2 are connected to the outer surface of the roof panel 1 via hot-air welding. For example, the waterproof membrane 2 can be made of thermoplastic polyolefin (TPO), thus being a TPO waterproof membrane 2. The waterproof membrane 2 can be connected to the outer surface of the roof panel 1, i.e., the waterproof layer, via hot-air welding. This connection is more secure, resists weathering, and prevents leaks at the joints, further improving the waterproof performance of the roof structure.

[0039] In one embodiment, the roof panel 1 may be flat.

[0040] In one embodiment, the roof panel 1 can be called a fusion tile. To enhance the structural stability and load-bearing capacity of the roof panel 1, the flat roof panel 1 can be profiled to form a concave-convex or wavy structure in the transverse direction of the roof panel 1. As shown in Figure 1, the roof panel 1 can include a crest 11 and a trough 12 that are interconnected. The crest 11 is upwardly convex relative to the trough 12, and the trough 12 is downwardly concave relative to the crest 11. The trough 12 is located near the gutter 7. The two ends of the waterproof membrane 2 extend to the outer surface of the trough 12 of the corresponding roof panel 1 and are connected to the outer surface of the trough 12 by hot air welding. For example, the left end of the waterproof membrane 2 extends to the outer surface of the trough 12 of the left roof panel 1 and is connected to the outer surface of the trough 12 of the left roof panel 1 by hot air welding; the right end of the waterproof membrane 2 extends to the outer surface of the trough 12 of the right roof panel and is connected to the outer surface of the trough 12 of the right roof panel by hot air welding.

[0041] In the roof structure of the disclosed embodiment, the trough portion 12 is close to the gutter 7, so that water in the crest portion 11 can flow to the trough portion 12 and then to the gutter 7, which facilitates drainage of the roof and further improves the waterproof performance of the roof structure.

[0042] In one embodiment, the peak portion 11 may be trapezoidal in shape, and the trough portion 12 may be trapezoidal in shape. Specific shapes of the peak portion 11 and the trough portion 12 are not limited herein, as long as the peak portion 11 is convex relative to the trough portion 12 and the trough portion 12 is concave relative to the peak portion 11.

[0043] In one embodiment, as shown in Figures 1 and 2, the roof structure may further include a first roll covering sheet 41, which extends from the outer surface of the peak portion 11 to the outer surface of the waterproof membrane 2. One end of the first roll covering sheet 41 is connected to the peak portion 11 by hot air welding, and the other end of the first roll covering sheet 41 is connected to the waterproof membrane 2 by hot air welding.

[0044] It should be noted that the crest portion 11 is farther from the gutter 7 than the trough portion 12. In Figure 1 , for ease of drawing, the upper surface of the crest portion 11 is extended to a position close to the gutter 7. In one embodiment, as shown in Figure 1 , the waterproof membrane 2 may include a first portion 21 located on the surface of the bottom wall 71, a second portion 22 located on the surface of the side wall 72, and a third portion 23 located on the surface of the trough portion 12.

[0045] Figure 4 only shows the trough 12 and the third portion 23 of the waterproof membrane 2 located on the surface of the trough 12. After the end of the waterproof membrane 2 is hot-air welded to the outer surface of the trough 12, the edge of the waterproof membrane 2 forms a connecting boundary 200 on the surface of the trough 12, as shown in Figure 4. As water flows from the peak 11 along the surface of the peak 11 toward the surface of the trough 12, it flows through the connecting boundary 200 and along the third portion 23 into the gutter 7. By providing a first membrane cover sheet 41, one end of which is hot-air welded to the peak 11 and the other end to the waterproof membrane 2, a portion of the water flowing from the peak 11 can flow directly along the surface of the first membrane cover sheet 41 toward the gutter 7, reducing the amount of water flowing through the connecting boundary and further improving the waterproof performance of the roof structure.

[0046] In one embodiment, one end of the first roll covering sheet 41 is connected to the crest portion 11 by hot air welding, and the other end of the first roll covering sheet 41 is connected to the third portion 23 of the waterproof roll 2 by hot air welding, as shown in FIG2 .

[0047] In one embodiment, a first cover sheet 41 extends from the outer surface of the peak portion 11 to the outer surface of the second portion 22. One end of the first cover sheet 41 is hot-air welded to the peak portion 11, while the other end is hot-air welded to the outer surface of the second portion 22. In other words, the other end of the first cover sheet 41 is hot-air welded to the outer surface of the second portion 22 of the waterproof membrane 2, as shown in Figure 1. This allows water to flow directly from the surface of the first cover sheet 41 to the gutter 7, preventing water from leaking through the boundary between the first cover sheet 41 and the waterproof membrane 2, further improving the waterproof performance of the roof structure.

[0048] As shown in Figure 1, the second portion 22 of the waterproof membrane 2 is fixedly connected to the corresponding side wall 72 via screws 3, with a waterproof bead 5 disposed between the nut of the screw 3 and the waterproof membrane 2. By fixing the second portion 22 to the side wall 72 via the screws 3, the waterproof membrane 2 can be better secured to the gutter 7, further improving the stability of the roof structure.

[0049] The second portion 22 is fixedly connected to the side wall 72 by screws 3. The connection between the screws 3 and the side wall 72 is prone to water seepage and corrosion. By providing a waterproof pressure strip 5 between the nut of the screw 3 and the waterproof membrane 2, water seepage and corrosion can be avoided at the connection between the screw 3 and the side wall 72.

[0050] The screws 3 can be self-tapping screws 3 to facilitate connection. The waterproof pressure strip 5 can be U-shaped, as shown in Figure 1. The material of the waterproof pressure strip 5 can include TPO.

[0051] The roof structure may also include a second covering sheet 42, which covers the screws 3 and the waterproofing strips 5. The outer periphery of the second covering sheet 42 is connected to the waterproofing membrane 2. For example, the outer periphery of the second covering sheet 42 is connected to the waterproofing membrane 2 via hot-air welding. This structure further prevents water seepage at the screw 3 location, further improving the waterproof performance of the roof structure.

[0052] For example, the screws 3 can be located anywhere on the sidewall 72. In one embodiment, the screws 3 are located at the lower portion of the sidewall 72, near the first portion 21. A portion of the second cover sheet 42 is hot-air welded to the second portion 22 of the waterproof membrane 2, while another portion is hot-air welded to the first portion 21 of the waterproof membrane 2, as shown in Figure 1. This allows the second cover sheet 42 to be angled at the junction of the first and second portions 21, 22, avoiding dead angles in the upper portion of the gutter 7. This prevents liquid from remaining and allows water to flow more smoothly along the sidewalls 72 of the gutter 7 toward the bottom wall 71.

[0053] For example, as shown in FIG1 , a first roll covering sheet 41 and a second roll covering sheet 42 are provided on both sides of the gutter 7. The first roll covering sheet 41 may be made of thermoplastic polyolefin. The second roll covering sheet 42 may be made of thermoplastic polyolefin.

[0054] As shown in FIG1 , the gutter 7 may further include a support arm 73 connected to the upper end of the side wall 72. The roof structure may further include purlins 6, and the support arm 73 is located above the purlins 6, so that the gutter 7 is supported by the purlins 6. The roof panel 1 may be located above the support arm 73, and thus, the roof panel 1 is supported by the purlins 6.

[0055] The roof structure may further include a steel mesh and a thermal insulation layer. The end of the steel mesh is located between the support arm 73 and the roof panel 1 , and the thermal insulation layer is located between the steel mesh and the roof panel 1 .

[0056] The roof structure of the embodiment of the present disclosure is provided with a waterproof layer on the surface of the roof plate 1. The roof plate 1 is located on opposite sides of the gutter 7. The waterproof membrane 2 covers the bottom wall and side walls of the gutter 7. The two ends of the waterproof membrane 2 extend to the outer surface of the corresponding roof plate 1 respectively and are connected to the outer surface of the roof plate 1. As a result, the junction between the gutter 7 and the roof plate 1 is covered by the waterproof membrane 2, avoiding the exposure of the cut section of the roof structure and reducing the risk of corrosion of the roof structure from the cut section; the waterproof membrane 2 also covers the bottom wall and side walls of the gutter 7 and covers the junction between the gutter 7 and the roof plate 1, so that the gutter 7 and the roof plate 1 form a closed waterproof whole after being connected by the waterproof membrane 2, avoiding water leakage at the junction of the roof and the gutter 7, improving the waterproof performance of the roof structure, and the structural strength and stability of the waterproof whole are greater, thereby improving the wind resistance of the roof structure and ensuring the stability of the roof structure.

[0057] An embodiment of the present disclosure further provides a building, comprising the roof structure of any embodiment of the present disclosure.

[0058] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0060] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0061] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0062] The disclosure above provides many different embodiments or examples for implementing different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the components and settings of specific examples are described above. Of course, these are merely examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0063] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in this disclosure, and such modifications or substitutions should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A roof structure, characterized in that: include: The gutter comprises a bottom wall and side walls located on both sides of the bottom wall, wherein the side walls are connected to the bottom wall; A roofing sheet, comprising a metal sheet layer and a waterproof layer attached to the outside of the metal sheet layer, wherein the roofing sheet is located on two opposite sides of the gutter; The waterproof coiled material covers the bottom wall and the side wall of the gutter, and the two ends of the waterproof coiled material respectively extend to the outer surface of the corresponding roof board and are connected to the outer surface of the roof board.

2. The roof structure according to claim 1, characterized in that: The two ends of the waterproof coiled material are respectively connected to the outer surface of the roof plate by hot air welding.

3. The roof structure according to claim 1, characterized in that: The roof plate comprises a peak portion and a trough portion connected to each other, the trough portion is close to the gutter, and both ends of the waterproof coiled material extend to the outer surface of the corresponding trough portion respectively and are connected to the outer surface of the trough portion by hot air welding.

4. The roof structure according to claim 3, characterized in that: It also includes a first roll covering sheet, which extends from the outer surface of the crest portion to the outer surface of the waterproof roll, one end of the first roll covering sheet is connected to the crest portion by hot air welding, and the other end of the first roll covering sheet is connected to the waterproof roll by hot air welding.

5. The roof structure according to claim 4, characterized in that: The waterproof roll material includes a second part located on the side wall surface, the first roll material covering sheet extends from the outer surface of the crest portion to the outer surface of the second part, and the other end of the first roll material covering sheet is connected to the outer surface of the second part by hot air welding.

6. The roof structure according to any one of claims 1 to 5, characterized in that: The waterproof coiled material comprises a second portion located on the surface of the side wall, the second portion is fixedly connected to the corresponding side wall by means of screws, and a waterproof pressure strip is arranged between the nut of the screw and the waterproof coiled material.

7. The roof structure according to claim 6, characterized in that: The waterproof pressure strip is U-shaped.

8. The roof structure according to claim 6, characterized in that: It also includes a second coiled material covering sheet, which covers the screws and the waterproof pressure strip, and the outer periphery of the second coiled material covering sheet is connected to the waterproof coiled material.

9. The roof structure according to claim 8, characterized in that: The waterproof roll material includes a first portion located on the bottom wall surface, the screw is close to the first portion, a portion of the second roll material covering sheet is connected to the second portion by hot air welding, and another portion is connected to the first portion by hot air welding.

10. The roof structure according to claim 9, characterized in that: The second web covering sheet extends obliquely from the second portion toward the first portion.

11. The roof structure according to claim 1, characterized in that: The waterproof layer is made of thermoplastic polyolefin.

12. The roof structure according to claim 1, characterized in that: The waterproof coiled material is made of thermoplastic polyolefin.

13. The roof structure according to claim 1, characterized in that: The gutter further includes a support arm connected to the upper end of the side wall, the roof structure further includes a purlin, the support arm is located above the purlin, and the roof board is located above the support arm.

14. The roof structure according to claim 13, characterized in that The roof structure further comprises a steel wire mesh and a heat-insulating layer, the end of the steel wire mesh is located between the support arm and the roof board, and the heat-insulating layer is located between the steel wire mesh and the roof board.

15. A building, characterized in that: A roof structure comprising the roof structure according to any one of claims 1 to 14.

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