Drainage system of special-shaped curved roof and construction method of drainage system

Abstract

According to the drainage system of the special-shaped curved roof and the construction method of the drainage system, the problems that an existing drainage system of the special-shaped curved roof is large in construction difficulty, poor in waterproof effect and inconvenient to construct and maintain are solved. The structure comprises ditches, water retaining devices and a water collecting tank, the multiple ditches are arranged at the top of a building main body steel structure at intervals and connected with the special-shaped curved roof into a whole, the water retaining device is correspondingly arranged on the side, with the elevation of the ditch top, of each ditch, the water retaining device is consistent with the extending direction of the corresponding ditch, and the water collecting tank is arranged in the ditch top. The water retaining device is in threaded connection with the top of the special-shaped curved roof, and the tail end of each ditch is provided with a water collecting tank communicated with the ditch. The construction method comprises the steps that the glass fiber veneer and the heat preservation layer are sequentially laid on the top of the supporting keel from bottom to top, the water retaining device is installed on one side of the ditch top elevation of each ditch, the bottom of each water retaining device is connected to the heat preservation layer of the roof through bolts, and the waterproof layers are sequentially laid on the heat preservation layers of the roof, the ditches and the water collecting tank. And a polyurethane waterproof coating is sprayed.

Description

Technical Field

[0001] The invention relates to the technical field of building decoration construction, and in particular to a drainage system for a special-shaped curved roof and a construction method thereof. Background Art

[0002] The special-shaped curved roofs of large public buildings often have the characteristics of large spans, rich shapes, multiple water accumulation surfaces and diverse flow directions. Special-shaped curved roofs usually contain many gutters, water collection tanks, rain gutters, external decorative components, special-shaped skylights and other structures. The roof drainage system has many overlapping points and complex handover relationships. The waterproof membrane needs to be cut a lot, resulting in poor drainage system integrity, many potential leakage risks, and difficulty in later maintenance. Therefore, how to ensure good waterproofing effects, reduce potential leakage risks, and facilitate construction and maintenance is a technical difficulty of the special-shaped curved roof drainage system. Summary of the invention

[0003] Aiming at the problems that the existing drainage system of special-shaped curved roof is difficult to construct, has poor waterproof effect and is inconvenient to construct and maintain, the purpose of the present invention is to provide a drainage system of special-shaped curved roof and a construction method thereof.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a drainage system for an irregular curved roof, comprising: a ditch, a water retaining device and a water collecting trough, a plurality of ditch are arranged at intervals on the top of the main steel structure of the building, and are connected to the irregular curved roof as a whole, a water retaining device is correspondingly arranged on the side with a lower elevation of the ditch top of each ditch, the water retaining device and the corresponding ditch extend in the same direction, the length of the water retaining device is greater than or equal to the length of the ditch, the water retaining device is threadedly connected to the top of the irregular curved roof, and a water collecting trough connected to the ditch is arranged at the end of each ditch.

[0005] The drainage system of the special-shaped curved roof of the present invention comprises a plurality of gutters which are arranged at intervals on the top of the main steel structure of the building and connected to the special-shaped curved roof as a whole, a water retaining device arranged on the side of the groove top of each gutter with a low elevation, and a water collecting trough arranged at the end of the gutter and connected with the gutter; since the gutters are irregularly distributed along the arc direction of the special-shaped curved roof, a water retaining device is correspondingly arranged on the side of the groove top with a low elevation of each gutter, and rainwater is diverted by the water retaining device to prevent rainwater from flowing along the arc surface of the roof and being collected in the lower gutter in large quantities, thereby reducing the drainage pressure of the lower gutter, reducing the hidden danger of roof leakage in the later stage, and improving the waterproof effect of the special-shaped curved roof; moreover, the water retaining device is threadedly connected to the roof, will not damage the overall waterproof structure of the roof, and guarantees the integrity of the roof drainage system to the greatest extent.

[0006] Furthermore, the special-shaped curved roof, gutters and water collection tanks at least include a supporting keel formed by welding steel sections, a galvanized steel plate laid on the supporting keel, a fiberglass veneer, an insulation layer, a waterproof layer and a polyurethane waterproof coating sprayed on the outer surface laid on the galvanized steel plate from bottom to top, wherein the cross-sections of the supporting keels at the gutters and water collection tanks are both U-shaped.

[0007] Furthermore, the water retaining device includes a nail plate, a support frame and side panels. The support frame is a continuous support frame body formed by welding steel square tubes arranged in a criss-cross pattern. The edges on both sides of the nail plate are threadedly connected to the top of the insulation layer and the waterproof layer of the special-shaped curved roof. The support frame is welded to the middle of the nail plate, and the side panels are threadedly connected to both sides of the support frame.

[0008] Furthermore, the outer sides of the exposed parts of the nail plate, side panels and support frame are all sprayed with a polyurethane waterproof coating.

[0009] Furthermore, a waterproof reinforcement layer is added between the thermal insulation layer and the waterproof layer on both sides of the inner wall and the top of the ditch, and the waterproof reinforcement layer is paved with modified asphalt waterproof membrane.

[0010] Furthermore, the bottom of the water collection tank is horizontal, the drainage port at the bottom of the water collection tank is connected to the rain gutter, and a rain gutter cover is installed on the top of the drainage port. At the drainage port on the bottom of the water collection tank, the waterproof layer and the polyurethane waterproof coating are extended to the inside of the rain gutter and laid, and asphalt glue is applied between the insulation layer and the waterproof layer near the drainage port on the bottom of the water collection tank.

[0011] In addition, the present invention also provides a construction method for a drainage system of a special-shaped curved roof, the steps of which are as follows:

[0012] The supporting keels of the special-shaped curved roof are installed on the top of the main steel structure of the building. The cross-section of the supporting keels at the ditch and the water collection tank is U-shaped. The end of the ditch extending to the bottom is connected to the water collection tank. Galvanized steel plates are laid on the top of the supporting keels of the roof and the inner side of the supporting keels at the ditch and the water collection tank. Glass fiber veneer and insulation layer are laid on the galvanized steel plates in sequence;

[0013] A water retaining device is installed on the side of the lower ditch top elevation of each ditch. The water retaining device is consistent with the extension direction of the ditch. The bottom of the water retaining device is bolted to the insulation layer of the roof. The waterproof layer is laid on the insulation layer of the roof, ditch and sump in sequence, and the polyurethane waterproof coating is sprayed.

[0014] The construction method of the drainage system of the special-shaped curved roof of the present invention comprises the following steps: first, a supporting keel of the roof, the ditch and the water collection tank is installed on the top of the main steel structure of the building, the end of the ditch is connected with the water collection tank, a glass fiber veneer and a thermal insulation layer are sequentially laid on the top of the supporting keel from bottom to top, a water retaining device is installed on the side of the ditch top with a low elevation of each ditch, the extension direction of the water retaining device is consistent with that of the ditch, the bottom of the water retaining device is bolted to the thermal insulation layer of the roof, a waterproof layer is sequentially laid on the thermal insulation layer at the roof, the ditch and the water collection tank, and a polyurethane waterproof coating is sprayed; and the water retaining device is used to prevent the water retaining device from leaking out. The device diverts rainwater to prevent it from flowing along the curved surface of the roof and gathering in the ditch below in large quantities, thereby reducing the drainage pressure of the ditch below, reducing the hidden danger of roof leakage in the later stage, and improving the waterproof effect of the special-shaped curved roof; since the waterproof structure of the ditch, sump and water retaining device is laid and connected as a whole, the waterproof effect of the roof drainage system is guaranteed, and the water retaining device is threadedly connected to the insulation layer of the roof, which will not damage the overall waterproof structure of the roof, thereby ensuring the integrity of the roof drainage system to the greatest extent and reducing the difficulty of construction and maintenance of the drainage system.

[0015] Furthermore, after the insulation layer is laid, a water retaining device is installed on the side of each ditch top with a low elevation, nail plates are placed at intervals along the installation positioning line, a plurality of screws pass through the installation holes on the nail plates and are threadedly connected to the insulation layer of the roof, a waterproof layer is laid as a whole, a support frame passes through the waterproof layer and is welded to the top of the nail plate, side panels are laid on both sides of the support frame, the side panels are threadedly connected to the support frame, and a polyurethane waterproof coating is sprayed on the exposed parts of the side panels, nail plates and support frames.

[0016] Furthermore, a waterproof reinforcement layer is provided between the thermal insulation layer and the waterproof layer within a width extending on both sides of the inner wall and the top of the ditch.

[0017] Furthermore, at the drainage outlet on the bottom surface of the sump, the waterproof layer and the polyurethane waterproof coating are extended to the inside of the rain gutter by at least 80 mm, and asphalt glue is applied between the insulation layer and the waterproof layer near the drainage outlet on the bottom surface of the sump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the water ditch in one embodiment of the drainage system for the special-shaped curved roof of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of a water ditch and a water retaining device in one embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of a water collecting tank in one embodiment of the present invention;

[0021] Figure 4 and Figure 5 It is a three-dimensional diagram of a drainage system for a special-shaped curved roof in one embodiment of the present invention.

[0022] The numbers in the figure are as follows:

[0023] Ditch 10; supporting keel 11; galvanized steel plate 12; thermal insulation layer 14; waterproof layer 15; polyurethane waterproof coating 16; waterproof reinforcement layer 17; water retaining device 20; nail plate 21; supporting frame 24; side plate 25; ceramic tile 30; water collection tank 50; rainwater gutter cover 51; rainwater gutter 52; asphalt glue 54. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. For the convenience of description, the "upper" and "lower" described below are consistent with the upper and lower directions of the drawings, but this cannot be a limitation of the technical solution of the present invention.

[0025] This embodiment takes the construction of a special-shaped curved ceramic tile roof as an example. The special-shaped curved ceramic tile roof is installed on the top of the main steel structure of the building. A plurality of hangers (not shown in the figure) are vertically arranged and connected to the top of the special-shaped curved ceramic tile roof. The ceramic tile 30 is connected to the top of the hanger. Figures 1 to 5 The drainage system of the special-shaped curved roof of the present invention is described, which includes: a ditch 10, a water retaining device 20 and a water collecting tank 50. A plurality of ditches 10 are arranged at intervals on the top of the main steel structure of the building and are connected to the special-shaped curved roof as a whole. Since the shape of the main steel structure of the building is a special-shaped curved surface, the elevations of the ditch tops on both sides of each ditch 10 are inconsistent. A water retaining device 20 is correspondingly arranged on the side of the ditch top with a lower elevation of each ditch 10. The extension direction of the water retaining device 20 is consistent with that of the corresponding ditch 10. The length of the water retaining device 20 is greater than or equal to the length of the ditch 10. The water retaining device 20 is threadedly connected to the top of the special-shaped curved roof. The end of each ditch 10 is provided with a water collecting tank 50 connected thereto.

[0026] The drainage system of the special-shaped curved roof of the present invention comprises a plurality of gutters 10 which are arranged at intervals on the top of the main steel structure of the building and connected to the special-shaped curved roof as a whole, a water retaining device 20 which is arranged on the side of the groove top of each gutter 10 with a low elevation, and a water collecting trough 50 which is arranged at the end of the gutter 10 and connected thereto; since the gutters 10 are irregularly distributed along the arc direction of the special-shaped curved roof, a water retaining device 20 is correspondingly arranged on the side of the groove top with a low elevation of each gutter 10, and the water retaining device 20 is used to divert rainwater to prevent rainwater from flowing along the arc surface of the roof and being collected in the lower gutter 10 in large quantities, thereby reducing the drainage pressure of the lower gutter 10, reducing the hidden danger of water leakage in the roof at a later stage, and improving the waterproof effect of the special-shaped curved roof; moreover, the water retaining device 20 is threadedly connected to the roof, and will not damage the overall waterproof structure of the roof, thereby ensuring the integrity of the roof drainage system to the greatest extent.

[0027] like Figures 1 to 3 As shown, the special-shaped curved roof, ditch 10 and water collection tank 50 at least include a supporting keel 11 formed by welding steel sections, a galvanized steel plate 12 laid on the supporting keel 11, a glass fiber veneer, an insulation layer 14, a waterproof layer 15 and a polyurethane waterproof coating 16 sprayed on the outer surface, which are laid on the galvanized steel plate 12 from bottom to top, wherein the cross-sections of the supporting keel 11 at the ditch 10 and the water collection tank 50 are both U-shaped. In this embodiment, the insulation layer 14 is paved with 100mm thick SBS special composite veneer waterproof insulation foam glass integrated bricks; the waterproof layer 15 is made of double-layer SBS waterproof coiled material with added rock slices, and the waterproof layer 15 has good waterproof performance and anti-aging performance, is simple to construct, and has a long service life; the polyurethane waterproof coating 16 is sprayed on the outer surface of the waterproof layer 15, and the thickness is 2mm.

[0028] like Figure 2 and Figure 3 As shown, the water retaining device 20 includes a nail plate 21, a support frame 24 and a side plate 25. The support frame 24 is a continuous support frame body formed by welding steel square tubes arranged in a crisscross pattern. The edges of both sides of the nail plate 21 are threadedly connected to the top of the insulation layer 14 and the waterproof layer 15 of the special-shaped curved roof. The support frame 24 is welded to the middle of the nail plate 21, and the side plates 25 are threadedly connected to both sides of the support frame 24. The side plates 25 of this embodiment are made of 2mm thick galvanized steel plates, and the nail plate 21 is made of 4mm thick galvanized steel plates. The bottom of the nail plate 21 is provided with a serrated structure, which can increase the contact area between the water retaining device 20 and the special-shaped curved roof, and improve the connection strength between the two. Moreover, the nail plate 21 is threadedly connected to the special-shaped curved roof, and the installation and disassembly are convenient and quick. Furthermore, the outer side of the exposed part of the nail plate 21, the side plate 25 and the support frame 24 are sprayed with a polyurethane waterproof coating 16 to improve the waterproof effect of the connection between the water retaining device 20 and the roof.

[0029] like Figure 1 As shown, within a range of 250 mm in width extending from the inner wall and the top of the ditch 10 to both sides, a waterproof reinforcement layer 17 is added between the insulation layer 14 and the waterproof layer 15. The waterproof reinforcement layer 17 is paved with a 3 mm thick SBS modified asphalt waterproof membrane. By adding the waterproof reinforcement layer 17 on both sides of the inner wall and the top of the ditch 10, the waterproof effect of the ditch 10 is improved, and an overall continuous waterproof structure is formed with the special-shaped curved roof.

[0030] Figure 3The schematic diagram of the structure of the water collecting tank 50 is shown in FIG. 5 . The oblique lines in the water collecting tank 50 represent rainwater. To facilitate the collection and discharge of rainwater, the bottom of the water collecting tank 50 is horizontal. The drainage outlet at the bottom of the water collecting tank 50 is connected to the rain gutter 52. A rain gutter 52 cover 51 is installed on the top of the drainage outlet. At the drainage outlet on the bottom of the water collecting tank 50, the waterproof layer 15 and the polyurethane waterproof coating 16 extend to the inside of the rain gutter 52 by at least 80 mm. At the bottom of the water collecting tank 50 near the drainage outlet, an asphalt adhesive layer 54 is applied between the insulation layer 14 and the waterproof layer 15 to strengthen the connection between the insulation layer 14 and the waterproof layer 15 at the drainage outlet, prevent the waterproof layer 15 from being damaged due to deformation of the insulation layer 14, temperature changes and other factors, and reduce the potential leakage of the water collecting tank 50.

[0031] Combination Figures 1 to 5 The construction method of the drainage system of the special-shaped curved roof of the present invention is described, and the specific steps are as follows:

[0032] A supporting keel 11 of a special-shaped curved roof is installed on the top of the main steel structure of the building. The cross section of the supporting keel 11 at the ditch 10 and the water collecting tank 50 is U-shaped. The end of the ditch 10 extending to the bottom is connected to the water collecting tank 50. Galvanized steel plates 12 are laid on the top of the supporting keel 11 of the roof and the inner side of the supporting keel 11 at the ditch 10 and the water collecting tank 50. Glass fiber veneer and insulation layer 14 are laid on the galvanized steel plate 12 in sequence.

[0033] A water retaining device 20 is installed on the side of the ditch top with a low elevation of each ditch 10. The water retaining device 20 extends in the same direction as the ditch 10. The bottom of the water retaining device 20 is bolted to the insulation layer 14 of the roof, and the pull-out value is determined through a pull-out test to meet the requirements of the specification. A waterproof layer 15 is laid in sequence on the insulation layer 14 at the roof, ditch 10 and sump 50, and a polyurethane waterproof coating 16 is sprayed.

[0034] The construction method of the drainage system of the special-shaped curved roof of the present invention comprises the following steps: first, a supporting keel 11 of the roof, the ditch 10 and the water collecting tank 50 is installed on the top of the main steel structure of the building, the end of the ditch 10 is connected with the water collecting tank 50, a glass fiber veneer and a thermal insulation layer 14 are sequentially laid on the top of the supporting keel 11 from bottom to top, a water retaining device 20 is installed on the side of the ditch top with a low elevation of each ditch 10, the extension direction of the water retaining device 20 is consistent with that of the ditch 10, the bottom of the water retaining device 20 is bolted to the thermal insulation layer 14 of the roof, a waterproof layer 15 is sequentially laid on the thermal insulation layer 14 at the roof, the ditch 10 and the water collecting tank 50, and a polyurethane waterproof coating 16 is sprayed; Figure 4 and Figure 5As shown in the figure, the arrow indicates the flow direction of rainwater. The water retaining device 20 is used to divert rainwater to prevent rainwater from flowing along the curved surface of the roof and gathering in the ditch 10 below in large quantities, thereby reducing the drainage pressure of the ditch 10 below, reducing the hidden danger of roof leakage in the later stage, and improving the waterproof effect of the special-shaped curved roof; since the waterproof structure of the ditch 10, the sump 50 and the water retaining device 20 are integrally laid and connected as a whole, the waterproof effect of the roof drainage system is guaranteed, and the water retaining device 20 is threadedly connected to the insulation layer 14 of the roof, which will not damage the overall waterproof structure of the roof, thereby ensuring the integrity of the roof drainage system to the greatest extent and reducing the difficulty of construction and maintenance of the drainage system.

[0035] like Figure 2 As shown, in the above steps, after the thermal insulation layer 14 is laid, a water retaining device 20 is installed on the side of each ditch 10 where the top elevation is low, and nail plates 21 are placed at intervals along the installation positioning line. A plurality of screws pass through the installation holes on the nail plates 21 and are threadedly connected to the thermal insulation layer 14 of the roof. The waterproof layer 15 is laid as a whole, and a support frame 24 passes through the waterproof layer 15 and is welded to the top of the nail plate 21. Side panels 25 are laid on both sides of the support frame 24, and the side panels 25 are threadedly connected to the support frame 24. A polyurethane waterproof coating 16 is sprayed on the exposed parts of the side panels 25, the nail plates 21 and the support frame 24.

[0036] like Figure 1 As shown, in the above steps, a waterproof reinforcement layer 17 is added between the insulation layer 14 and the waterproof layer 15 within a 250mm width extending from the inner wall and the top of the ditch 10 to both sides. The waterproof reinforcement layer 17 is paved with a 3mm thick SBS modified asphalt waterproof membrane. By adding the waterproof reinforcement layer 17 on both sides of the inner wall and the top of the ditch 10, the waterproof effect of the ditch 10 is improved, and an integral continuous waterproof structure is formed with the special-shaped curved roof. Figure 3 As shown, in the above steps, at the drainage outlet on the bottom surface of the sump 50, the waterproof layer 15 and the polyurethane waterproof coating 16 are extended to the inside of the rain gutter 52 by at least 80 mm, and an asphalt adhesive layer 54 is applied between the insulation layer 14 and the waterproof layer 15 near the drainage outlet on the bottom surface of the sump 50 to strengthen the connection between the insulation layer 14 and the waterproof layer 15 at the drainage outlet, prevent the waterproof layer 15 from being damaged due to deformation of the insulation layer 14, temperature changes and other factors, and reduce the risk of water leakage in the sump 50.

[0037] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of the claims.

Claims

1. A drainage system for a special-shaped curved roof, characterized in that: include: Ditches, water retaining devices and water collection tanks, multiple ditches are arranged at intervals on the top of the main steel structure of the building, and are connected to the special-shaped curved roof as a whole. A water retaining device is arranged on the side of the lower elevation of the ditch top of each ditch. The extension direction of the water retaining device is consistent with that of the corresponding ditch. The length of the water retaining device is greater than or equal to the length of the ditch. The water retaining device is threadedly connected to the top of the special-shaped curved roof. A water collection tank connected to it is provided at the end of each ditch.

2. The drainage system for a special-shaped curved roof according to claim 1, characterized in that: The special-shaped curved roof, ditch and water collection tank at least include a supporting keel formed by welding steel sections, a galvanized steel plate laid on the supporting keel, a glass fiber veneer, an insulation layer, a waterproof layer and a polyurethane waterproof coating sprayed on the outer surface laid on the galvanized steel plate from bottom to top, wherein the cross-sections of the supporting keels at the ditch and the water collection tank are both U-shaped.

3. The drainage system for a special-shaped curved roof according to claim 1, characterized in that: The water retaining device includes a nail plate, a support frame and side plates. The support frame is a continuous support frame body formed by welding steel square tubes arranged in a criss-cross pattern. The edges on both sides of the nail plate are threadedly connected to the top of the insulation layer and the waterproof layer of the special-shaped curved roof. The support frame is welded to the middle of the nail plate, and the side plates are threadedly connected to both sides of the support frame.

4. The drainage system for a special-shaped curved roof according to claim 3, characterized in that: The exposed outer sides of the nail plate, the side plate and the support frame are all sprayed with polyurethane waterproof coating.

5. The drainage system for a special-shaped curved roof according to claim 2, characterized in that: On both sides of the inner wall and the top of the ditch, a waterproof reinforcement layer is added between the thermal insulation layer and the waterproof layer, and the waterproof reinforcement layer is paved with modified asphalt waterproof membrane.

6. The drainage system for a special-shaped curved roof according to claim 2, characterized in that: The bottom of the water collection tank is horizontal, the drainage port at the bottom of the water collection tank is connected to the rain gutter, and a rain gutter cover is installed on the top of the drainage port. At the drainage port on the bottom of the water collection tank, the waterproof layer and the polyurethane waterproof coating are extended to the inside of the rain gutter and laid, and asphalt glue is applied between the insulation layer and the waterproof layer near the drainage port on the bottom of the water collection tank.

7. The construction method of the drainage system of the special-shaped curved roof according to claim 2, characterized in that: Here are the steps: The supporting keels of the special-shaped curved roof are installed on the top of the main steel structure of the building. The cross-section of the supporting keels at the ditch and the water collection tank is U-shaped. The end of the ditch extending to the bottom is connected to the water collection tank. Galvanized steel plates are laid on the top of the supporting keels of the roof and the inner side of the supporting keels at the ditch and the water collection tank. Glass fiber veneer and insulation layer are laid on the galvanized steel plates in sequence; A water retaining device is installed on the side of the lower ditch top elevation of each ditch. The water retaining device is consistent with the extension direction of the ditch. The bottom of the water retaining device is bolted to the insulation layer of the roof. The waterproof layer is laid on the insulation layer of the roof, ditch and sump in sequence, and the polyurethane waterproof coating is sprayed.

8. The construction method of the drainage system of the special-shaped curved roof according to claim 7 is characterized by: After the insulation layer is laid, a water retaining device is installed on the side of each ditch top with a low elevation, nail plates are placed at intervals along the installation positioning line, multiple screws penetrate the installation holes on the nail plates and are threadedly connected to the insulation layer of the roof, and a waterproof layer is laid as a whole. The support frame passes through the waterproof layer and is welded to the top of the nail plate, side panels are laid on both sides of the support frame, and the side panels are threadedly connected to the support frame, and a polyurethane waterproof coating is sprayed on the exposed parts of the side panels, nail plates and support frames.

9. The construction method of the drainage system of the special-shaped curved roof according to claim 7, characterized in that: A waterproof reinforcement layer is provided between the thermal insulation layer and the waterproof layer within a width extending on both sides of the inner wall and the top of the ditch.

10. The construction method of the drainage system of the special-shaped curved roof according to claim 7, characterized in that: At the drain outlet on the bottom of the sump, the waterproof layer and the polyurethane waterproof coating are extended to the inside of the rain gutter by at least 80mm. At the bottom of the sump near the drain outlet, asphalt glue is applied between the insulation layer and the waterproof layer.

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