Large-curvature metal roof profiling bottom plate connecting structure and construction method thereof

Abstract

The invention discloses a large-curvature metal roof profiled bottom plate connecting structure and a construction method thereof, and the profiled bottom plate connecting structure comprises profiled bottom plates vertically connected to a first purline and a second purline respectively, a heat insulation plate connected to the profiled bottom plates, and a metal veneer connected to the upper part of the heat insulation plate. Through the arrangement of the intersection seams of the profiling bottom plates, the whole assembly of the profiling bottom plates on the two sides of the large-curvature corner is ensured; through the arrangement of the temple piece, the supporting of the overhanging edge of the second profiled steel sheet at the higher position can be guaranteed; through the arrangement of the connecting pieces, it is guaranteed that the first profiled steel sheet and the second profiled steel sheet are fixedly connected, and the shape of the intersection seam is guaranteed; through the arrangement of the transfer beam, the first purline connecting piece and the second purline connecting piece, installation of purlines below the profiling bottom plate is guaranteed, and then stress and installation of the profiling bottom plate are guaranteed; and through the arrangement of the nail disc, fixation and installation of the heat preservation layer can be guaranteed, and an installation foundation is provided for the metal veneer.

Description

Technical Field

[0001] The invention belongs to the technical field of metal roof installation, and in particular relates to a large-curvature metal roof profiled bottom plate connection structure and a construction method thereof. Background Art

[0002] In existing building construction designs, metal decorative panels are often used for roof decoration. To ensure support beneath the metal decorative panels, corrugated steel sheets are often used as the base plate during steel structure construction. Corrugated steel sheets offer superior properties such as high strength, lightweight, corrosion resistance, and thermal insulation. Corrugated steel sheets are typically installed in a straight-line manner. However, when encountering roof structures with large curvatures or corners, staggered butt joints are required. These staggered butt joints require on-site cutting, which significantly wastes time and costs, and also poses safety risks. Therefore, targeted designs for corrugated steel sheets at these intersections are necessary. Summary of the Invention

[0003] The present invention provides a large-curvature metal roof corrugated bottom plate connection structure and a construction method thereof, which are used to solve the technical problems of fixing, supporting and installing the corrugated bottom plates at the intersection of large-curvature roof structures.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A large-curvature metal roof corrugated base plate connection structure comprises a main steel structure, a transfer beam connected to one side of the main steel structure, a first purlin connector connected to the other side of the main steel structure, a second purlin connector connected above the transfer beam, a first purlin connected to the first purlin connector, a second purlin connected to the second purlin connector, a corrugated base plate vertically connected to the first purlin and the second purlin, respectively, an insulation board connected to the corrugated base plate, and a metal decorative panel connected above the insulation board; The corrugated bottom plate has no less than two layers in the height direction, each layer is a large curvature elliptical cone surface and extends sequentially from top to bottom, and the upper layer is provided with a cantilevered eaves at the intersection of the two layers; The corrugated bottom plate comprises a first corrugated steel plate arranged perpendicular to the first purlin, and a second corrugated steel plate arranged perpendicular to or at an angle relative to the first corrugated steel plate; the first corrugated steel plate and the second corrugated steel plate are fixedly connected at the top of the intersection by a connecting piece; the first corrugated steel plate and the second corrugated steel plate are arranged in a broken line shape at the intersection; A side brace is further provided below the second corrugated steel plate. The side brace is connected to the second purlin and a side fixing piece is provided at the cantilever end of the side brace. The side fixing piece is connected to the second corrugated steel plate via fixing nails.

[0005] Furthermore, the transfer beam is connected to the upper part of the main steel structure and is arranged in a broken line with the main steel structure; the first purlin connector is arranged in the upper middle part of the other side of the main steel structure and is arranged in a broken line with the main steel structure.

[0006] Furthermore, the first purlin connectors are arranged at longitudinal intervals at the designed folded corners or folded edges, and the first purlin connectors are arranged in pairs; the first purlins are fixedly connected in the middle of the paired first purlin connectors, and the first purlins are made of rectangular steel pipes; the length of the first purlins corresponds to the setting of the first corrugated steel plate.

[0007] Furthermore, the second purlin connectors are spaced apart in an upward direction along the transfer beam length, and the second purlin connectors are arranged in pairs; the second purlins are fixedly connected in the middle of the paired second purlin connectors, and the second purlins are made of rectangular steel pipes.

[0008] Furthermore, the first corrugated steel plate and the second corrugated steel plate respectively correspond to two intersecting plane areas, which are divided according to the shape of the main steel structure and the metal decorative panel; a connecting piece is correspondingly provided at the intersection; The connecting pieces are zigzag connecting plates, which are arranged along the length of the intersecting seams or at intervals.

[0009] Furthermore, a nail plate is provided, which penetrates the insulation board and the corrugated bottom plate and has its bottom connected to the first purlin, the transfer beam or the side support member; the nail plate is densely arranged on both sides of the intersection seam.

[0010] Furthermore, the nail plate includes a top plate arranged on the top surface of the insulation board and connecting nails arranged below the nail plate, and the connecting nails pass through the insulation board and the corrugated bottom plate and are fixed to the first purlin, the transfer beam or the side support.

[0011] Furthermore, a base bottom fixture is fixedly connected above the top plate, and the base bottom fixture includes a bottom plate and a U-shaped part arranged on the bottom surface, and the U-shaped part corresponds to an angular keel base connected by bolts; the keel base corresponds to an adjustable mounting keel, and the top of the keel is fixedly connected to a metal decorative panel.

[0012] Furthermore, the side support is an angle steel piece, and its length corresponds to the distance from the second purlin on the side to the intersection; the cantilevered end of the side support is provided with an angular side fixing piece, and the side fixing piece is arranged along the length of the intersection or at intervals.

[0013] Furthermore, the construction method of the large curvature metal roof profiled bottom plate connection structure has the following specific steps: Step 1: Create a 3D model based on the detailed drawings of the main steel structure; and determine the partitions of the profiled base plate in combination with the shape of the metal decorative panels. The profiled base plate should have no less than two layers in the height direction, and each layer should be a large curvature elliptical cone surface that extends from top to bottom. At the intersection of the two layers, the upper layer should be provided with an extended cantilevered eaves. Step 2: Partition the area based on the metal decorative panels of each floor. The partitions are based on the steel beams and spans of the main steel structure. The partition joints are set at the steel beams of the main steel structure. The corrugated bottom plates in the partitions are laid straight and parallel. The corrugated steel plates on both sides of the partition joints are intersected, with the first corrugated steel plate and the second corrugated steel plate on both sides respectively. Step 3: After the main steel structure is completed, install the transfer beam, the first purlin connector and the second purlin connector on the main steel structure. After installation, calibrate the position; then install the first purlin and the second purlin. Step 4: Determine the length of the temple member based on the position of the second peripheral purlin so that the intersection between the second corrugated steel sheet and the corresponding first corrugated steel sheet on the side meets the design requirements; wherein, edge fixing members are pre-installed at the extended end of the temple member; Step 5: Install according to the partition number of the 3D software. First install the first corrugated steel sheet in the vertically lower area, and install it in sequence from one side of the partition; then install the second corrugated steel sheet in the higher area; then install the connecting pieces between the adjacent first and second corrugated steel sheets to ensure the integrity of the intersection; Step 6: As shown in step 5, the adjacent corrugated bottom plates on both sides of the intersecting seam in each layer are installed in sequence. The lower one is used as the first corrugated steel plate, and the higher one is used as the second corrugated steel plate. The corrugated bottom plates of one layer are installed successfully. Then, the corrugated steel plates of the next layer are installed until the installation of the entire corrugated steel plate is completed. Step 7. After the corrugated steel sheet is installed, install the insulation board on it through the nail plate, and install the nail plates on both sides of the intersection of the corrugated steel sheet more densely; then install the base bottom fasteners, keel base and keel on the top of the nail plate; then install the metal decorative panel above the keel, thereby completing the construction of the large curvature metal roof corrugated bottom plate connection structure.

[0014] The beneficial effects of the present invention are embodied in: The present invention ensures the integral assembly of the corrugated bottom plates on both sides at the corners with large curvatures by setting the intersecting seams of the corrugated bottom plates, without the need for on-site cutting and splitting, which greatly saves labor time and costs and avoids safety risks; the setting of the side supports facilitates the support of the cantilevered edge of the second corrugated steel plate at a higher position; and the setting of the connecting pieces ensures the fixed connection of the first corrugated steel plate and the second corrugated steel plate, and ensures the shape of the intersecting seams; the setting of the transition beam, the first purlin connector and the second purlin connector facilitates the installation of the purlins below the corrugated bottom plate, thereby ensuring the stress and installation of the corrugated bottom plate; the setting of the nail plate facilitates the fixation and installation of the insulation layer and provides an installation foundation for the metal decorative panel. Other features and advantages of the present invention will be explained in the subsequent description, and part of them will become obvious from the description, or be understood through the implementation of the present invention; the main purpose and other advantages of the present invention can be achieved and obtained through the schemes specifically pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view schematic diagram of a large curvature metal roof; Figure 2 This is a cross-sectional view of the connection structure of the profiled bottom plate of the metal roof with large curvature at the intersection; Figure 3 This is a schematic diagram of the connection structure at the profiled bottom plate; Figure 4 It is a partial schematic diagram of the connection structure at the profiled bottom plate; Figure 5 1. It is a schematic diagram of the nail plate and its connection structure; Figure 6 It is a schematic diagram of the base bottom firmware structure.

[0016] Figure markings: 1-metal decorative panel, 2-main steel structure, 3-transfer beam, 4-first purlin connector, 5-second purlin connector, 6-first purlin, 7-second purlin, 8-corrugated bottom plate, 81-first corrugated steel plate, 82-second corrugated steel plate, 9-insulation board, 10-nail plate, 101-top plate, 102-connecting nails, 11-keel base, 12-keel, 13-side support, 14-connecting piece, 15-fixing nails, 16-side fasteners, 17-base bottom fasteners. DETAILED DESCRIPTION

[0017] Taking a certain Internet industry innovation project as an example, the metal roofing project of Building 2# has entered the construction site. The main steel structure of the project is an elliptical structure with a large curvature. The metal roof is divided into three layers, extending from top to bottom; each layer has a cantilevered edge at the junction. A corrugated bottom plate 8 is set under the metal roof. Figures 1 to 6As shown, the large-curvature metal roof corrugated base plate connection structure includes a main steel structure 2, a transfer beam 3 connected to one side of the main steel structure 2, a first purlin 6 connector 4 connected to the other side of the main steel structure 2, a second purlin 7 connector 5 connected above the transfer beam 3, a first purlin 6 connected to the first purlin 6 connector 4, a second purlin 7 connected to the second purlin 7 connector 5, a corrugated base plate 8 vertically connected to the first purlin 6 and the second purlin 7 respectively, an insulation board 9 connected to the corrugated base plate 8, and a metal decorative panel 1 connected above the insulation board 9; wherein the metal decorative panel 1 is a 3 mm thick aluminum single plate.

[0018] In this embodiment, the insulation board 9 is divided into two layers. The upper insulation board 9 is a 150mm thick composite veneer foam glass insulation board (both the upper and lower surfaces are fiberglass veneer, with a thermal conductivity of 0.045W / MK and a density of no more than 120kg / m³). The lower insulation board 9 is a 150mm thick composite veneer foam glass insulation board (the upper surface is asphalt veneer, the lower surface is fiberglass veneer, with a thermal conductivity of 0.045W / MK and a density of no more than 120kg / m³). The upper and lower insulation boards 9 are connected by an adhesive. A waterproof membrane is provided on the top of the insulation board 9. The waterproof membrane is a 3.0mm thick hot-melt SBS modified asphalt waterproof membrane with shale sheets. A polyurethane urea spray is provided on the top of the waterproof membrane. The 2.0mm thick polyurethane urea spray contains a special interface agent, a spray polyurea waterproof coating, and an aliphatic polyurethane weather-resistant topcoat.

[0019] In this embodiment, the profiled base plate 8 is layered in the height direction corresponding to the metal veneer 1. Each layer is a highly curvatured elliptical conical surface that extends sequentially from top to bottom. Where two layers intersect, the upper layer is provided with a cantilevered eave. The profiled base plate 8 comprises a first profiled steel sheet 81, positioned perpendicular to the first purlin 6, and a second profiled steel sheet 82, positioned perpendicular or at an angle to the first profiled steel sheet 81. The top of the intersection of the first and second profiled steel sheets 81, 82 is fixedly connected by a connecting member 14. At the intersection, the first and second profiled steel sheets 81, 82 are arranged in a broken line. Both the first and second profiled steel sheets 81, 82 are 1.0 mm thick YX38-150-900 aluminum-zinc-coated profiled steel sheets.

[0020] In this embodiment, a temple member 13 is further provided below the second corrugated steel sheet 82. This temple member 13 is connected to the second purlin 7, and a side fastener 16 is provided at the cantilever end of the temple member 13. The side fastener 16 is connected to the second corrugated steel sheet 82 via fixing pins 15. The transfer beam 3 is connected to the upper portion of the main steel structure 2 and is arranged in a zigzag pattern with the main steel structure 2. The first purlin 6 connector 4 is provided in the upper middle portion of the other side of the main steel structure 2 and is arranged in a zigzag pattern with the main steel structure 2.

[0021] In this embodiment, the first purlin 6 connectors 4 are spaced apart along the length of the designed corners or edges, and are arranged in pairs. The paired first purlin 6 connectors 4 are fixedly connected to the first purlin 6 at the center, and the first purlin 6 is made of rectangular steel pipe. The length of the first purlin 6 corresponds to the length of the first corrugated steel sheet 81. The second purlin 7 connectors 5 are spaced apart along the length of the transfer beam 3, and are arranged in pairs. The paired second purlin 7 connectors 5 are fixedly connected to the second purlin 7 at the center, and the second purlin 7 is made of rectangular steel pipe. Both the first purlin 6 and the second purlin 7 are 120×60×4 rectangular steel purlins, with a spacing of no more than 1200mm.

[0022] In this embodiment, the first corrugated steel sheet 81 and the second corrugated steel sheet 82 correspond to two intersecting planar regions, which are divided according to the shape of the main steel structure 2 and the metal decorative panel 1. Connectors 14 are provided at these intersections. These connectors 14 are zigzag-shaped connecting plates that run the entire length of the intersecting seam or are spaced apart. These connecting plates 14 are aluminum alloy profiles coated with polyurea for waterproofing.

[0023] A nail plate is also provided, which passes through the insulation board 9 and the corrugated bottom plate 8 and is connected to the first purlin 6, the transition beam 3 or the side support 13 at the bottom; the nail plates are densely arranged on both sides of the intersecting seam. The nail plate includes a top plate 101 provided on the top surface of the insulation board 9 and connecting nails 102 provided below the nail plate. The connecting nails 102 pass through the insulation board 9 and the corrugated bottom plate 8 and are fixed to the first purlin 6, the transition beam 3 or the side support 13. Among them, the nail plate is a 1.5×200×200mm PCSP metal nail plate. A base bottom fastener 17 is fixedly connected above the top plate 101. The base bottom fastener 17 includes a bottom plate and a U-shaped part provided on the bottom surface. The U-shaped part corresponds to the angular keel base 11 connected by bolts; the keel base 11 corresponds to the adjustable mounting keel 12, and the top of the keel 12 is fixedly connected to the metal decorative panel 1.

[0024] In this embodiment, the side support member 13 is an angle steel member, and its length corresponds to the distance from the second purlin 7 on the side to the intersection; the cantilevered end of the side support member 13 is provided with an angular side fixing member 16, and the side fixing member 16 is arranged along the length of the intersection or at intervals.

[0025] Combine Figures 1 to 6 As shown in FIG, the construction method of the large curvature metal roof profiled bottom plate connection structure has the following specific steps: Step 1: Build a three-dimensional model based on the detailed drawing of the main steel structure 2; and determine the partitioning of the corrugated bottom plate 8 in combination with the shape of the metal decorative panel 1; the corrugated bottom plate 8 has no less than two layers in the height direction, each layer is a large curvature elliptical cone surface and extends sequentially from top to bottom, and the upper layer is provided with a protruding cantilevered eaves at the intersection of the two layers.

[0026] Step 2: Partition the area according to the metal decorative panels 1 of each layer, and the partitions are based on the steel beams and spans of the main steel structure 2; set the partition joints at the steel beams of the main steel structure 2; the corrugated bottom plates 8 in the partitions are all laid straight and parallel; the corrugated steel plates on both sides of the partition joints are intersected, and the two sides are respectively the first corrugated steel plate 81 and the second corrugated steel plate 82.

[0027] Step 3: After the construction of the main steel structure 2 is completed, the transfer beam 3, the first purlin 6 connector 4 and the second purlin 7 connector 5 are installed on the main steel structure 2. After the installation is completed, the position is corrected; then the first purlin 6 and the second purlin 7 are installed.

[0028] Step 4: Determine the length of the side brace 13 according to the position of the second peripheral purlin 7 so that the intersection between the second corrugated steel plate 82 on the side and the corresponding first corrugated steel plate 81 meets the design requirements; wherein, a side fixing piece 16 is pre-installed at the protruding end of the side brace 13.

[0029] Step 5: Install according to the three-dimensional software partition number. First install the first corrugated steel plate 81 in the lower vertical area, and install it in sequence from one side of the partition; then install the second corrugated steel plate 82 in the higher partition; then install the connecting piece 14 between the adjacent first corrugated steel plate 81 and the second corrugated steel plate 82 to ensure the integrity of the intersecting seam.

[0030] Step 6. As shown in step 5, the corrugated bottom plates 8 adjacent to each other on both sides of the intersecting seam in each layer are installed in sequence with the lower one serving as the first corrugated steel plate 81 and the higher one serving as the second corrugated steel plate 82 until all the corrugated bottom plates 8 of one layer are successfully installed; then the corrugated steel plates of the next layer are installed until the installation of the entire corrugated steel plate is completed.

[0031] Step 7. After the corrugated steel plate is installed, the insulation board 9 is installed on it through the nail plate, and the nail plates are installed densely on both sides of the intersection of the corrugated steel plate; then the base bottom fixture 17, keel base 11 and keel 12 are installed on the top of the nail plate; the elliptical long hole is set on the keel base 11 to fine-tune the keel 12 during installation; after the keel 12 is installed and positioned and meets the design requirements, the metal decorative panel 1 is installed above the keel 12, thereby completing the construction of the large-curvature metal roof corrugated bottom plate connection structure.

[0032] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A large curvature metal roof profiled bottom plate connection structure, characterized in that: The utility model comprises a main steel structure, a transfer beam connected to one side of the main steel structure, a first purlin connector connected to the other side of the main steel structure, a second purlin connector connected above the transfer beam, a first purlin connected to the first purlin connector, a second purlin connected to the second purlin connector, a corrugated bottom plate vertically connected to the first purlin and the second purlin respectively, an insulation board connected to the corrugated bottom plate, and a metal decorative panel connected above the insulation board; The corrugated bottom plate has no less than two layers in the height direction, each layer is a large curvature elliptical cone surface and extends sequentially from top to bottom, and the upper layer is provided with a cantilevered eaves at the intersection of the two layers; The corrugated bottom plate comprises a first corrugated steel plate arranged perpendicular to the first purlin, and a second corrugated steel plate arranged perpendicular to or at an angle relative to the first corrugated steel plate; the first corrugated steel plate and the second corrugated steel plate are fixedly connected at the top of the intersection by a connecting piece; the first corrugated steel plate and the second corrugated steel plate are arranged in a broken line shape at the intersection; A side brace is further provided below the second corrugated steel plate. The side brace is connected to the second purlin and a side fixing piece is provided at the cantilever end of the side brace. The side fixing piece is connected to the second corrugated steel plate via fixing nails.

2. A large curvature metal roof profiled bottom plate connection structure as claimed in claim 1, characterized in that: The transfer beam is connected to the upper part of the main steel structure and is arranged in a broken line with the main steel structure; the first purlin connector is arranged in the middle and upper part of the other side of the main steel structure and is arranged in a broken line with the main steel structure.

3. A large curvature metal roof profiled bottom plate connection structure as claimed in claim 2, characterized in that: The first purlin connectors are arranged at longitudinal intervals of the designed folded corners or folded edges, and the first purlin connectors are arranged in pairs; the first purlins are fixedly connected in the middle of the paired first purlin connectors, and the first purlins are made of rectangular steel pipes; the length of the first purlins corresponds to the setting of the first corrugated steel plate.

4. A large curvature metal roof profiled bottom plate connection structure as claimed in claim 3, characterized in that: The second purlin connectors are arranged at intervals upward along the length of the transfer beam and are arranged in pairs; the second purlin connectors in pairs are fixedly connected to the second purlins in the middle, and the second purlins are made of rectangular steel pipes.

5. A large curvature metal roof profiled bottom plate connection structure as claimed in claim 4, characterized in that: The first corrugated steel plate and the second corrugated steel plate correspond to two intersecting plane areas respectively. The plane areas are divided according to the shape of the main steel structure and the metal decorative panel. Connecting pieces are provided at the intersections. The connecting pieces are zigzag connecting plates, which are arranged along the length of the intersecting seams or at intervals.

6. A large curvature metal roof profiled bottom plate connection structure as claimed in claim 5, characterized in that: A nail plate is also provided, which penetrates the insulation board and the corrugated bottom plate and has a bottom connected to the first purlin, the transfer beam or the side support member; The nail plates are densely arranged on both sides of the intersecting seam.

7. A large curvature metal roof profiled bottom plate connection structure as claimed in claim 6, characterized in that: The nail plate comprises a top plate arranged on the top surface of the insulation board and connecting nails arranged below the nail plate. The connecting nails penetrate the insulation board and the corrugated bottom plate and are fixed on the first purlin, the transfer beam or the side support.

8. The large curvature metal roof profiled bottom plate connection structure according to claim 7, characterized in that: A base bottom fixture is fixedly connected above the top plate, and the base bottom fixture includes a bottom plate and a U-shaped part arranged on the bottom surface. The U-shaped part corresponds to an angular keel base connected by bolts; the keel base corresponds to an adjustable mounting keel, and the top of the keel is fixedly connected to a metal decorative panel.

9. A large curvature metal roof profiled bottom plate connection structure as claimed in claim 8, characterized in that: The side brace is an angle steel piece, and its length corresponds to the distance from the second purlin on the side to the intersection; the cantilevered end of the side brace is provided with an angular side fixing piece, and the side fixing piece is arranged along the length of the intersection or at intervals.

10. A construction method for the large-curvature metal roof profiled bottom plate connection structure according to any one of claims 1 to 9, characterized in that: The specific steps are as follows: Step 1: Create a 3D model based on the detailed drawings of the main steel structure; and determine the partitions of the profiled base plate in combination with the shape of the metal decorative panels. The profiled base plate should have no less than two layers in the height direction, and each layer should be a large curvature elliptical cone surface that extends from top to bottom. At the intersection of the two layers, the upper layer should be provided with an extended cantilevered eaves. Step 2: Partition the area based on the metal decorative panels of each floor. The partitions are based on the steel beams and spans of the main steel structure. The partition joints are set at the steel beams of the main steel structure. The corrugated bottom plates in the partitions are laid straight and parallel. The corrugated steel plates on both sides of the partition joints are intersected, with the first corrugated steel plate and the second corrugated steel plate on both sides respectively. Step 3: After the main steel structure is completed, install the transfer beam, the first purlin connector and the second purlin connector on the main steel structure. After installation, calibrate the position; then install the first purlin and the second purlin. Step 4: Determine the length of the temple member based on the position of the second peripheral purlin so that the intersection between the second corrugated steel sheet and the corresponding first corrugated steel sheet on the side meets the design requirements; wherein, edge fixing members are pre-installed at the extended end of the temple member; Step 5: Install according to the partition number of the 3D software. First install the first corrugated steel sheet in the vertically lower area, and install it in sequence from one side of the partition; then install the second corrugated steel sheet in the higher area; then install the connecting pieces between the adjacent first and second corrugated steel sheets to ensure the integrity of the intersection; Step 6: As shown in step 5, the adjacent corrugated bottom plates on both sides of the intersecting seam in each layer are installed in sequence. The lower one is used as the first corrugated steel plate, and the higher one is used as the second corrugated steel plate. The corrugated bottom plates of one layer are installed successfully. Then, the corrugated steel plates of the next layer are installed until the installation of the entire corrugated steel plate is completed. Step 7. After the corrugated steel sheet is installed, install the insulation board on it through the nail plate, and install the nail plates on both sides of the intersection of the corrugated steel sheet more densely; then install the base bottom fasteners, keel base and keel on the top of the nail plate; then install the metal decorative panel above the keel, thereby completing the construction of the large curvature metal roof corrugated bottom plate connection structure.

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