A curtain wall drainage system and its construction method

Abstract

This invention discloses a curtain wall drainage system and its construction method, belonging to the field of building curtain wall drainage technology. The system includes a glass panel, a vertical frame, a sealing component, an upper horizontal drainage outlet, a vertical drainage channel, a connecting pipe, a bottom water collection trough, a bottom horizontal drainage channel, and a drainage outlet. The upper horizontal drainage outlet is connected to the vertical drainage channel to collect water from the curtain wall cavity; the vertical drainage channel guides the water downwards to the bottom water collection trough; the bottom water collection trough is connected to the bottom horizontal drainage channel, and the water is finally discharged in an organized manner through the drainage outlet facing the outside. This invention achieves water balance and backup drainage along the drainage path by setting up a connecting pipe, and effectively solves the problems of poor drainage, easy backflow, easy clogging, and bottom dampness in the prior art by setting up structures such as anti-backflow baffles, insect-proof and anti-clogging nets, overflow outlets, and drip lines.

Description

Technical Field

[0001] This invention relates to the field of curtain wall structure technology, specifically to a curtain wall drainage system and its construction method. Background Technology

[0002] As a widely used external envelope structure in modern buildings, the waterproofing and drainage performance of building curtain walls directly affects the building's functionality and lifespan. Currently, curtain wall systems typically rely on external sealing strips, sealant, and pressure plates to form the first line of defense against water damage. However, in actual use, factors such as material aging, temperature deformation, wind loads, and construction quality can make it difficult for the external sealing system to maintain absolute reliability over the long term, allowing rainwater to still seep into the curtain wall cavity under wind pressure.

[0003] In recent years, several improved technologies have been proposed. For example, Chinese invention patent application CN121407678A (published on January 27, 2026) discloses a building structure with curtain wall drainage function and its construction method. This building structure includes interconnected walls, comprising a first wall, a second wall, and a connecting wall, with at least one connecting wall between the first and second walls. Drainage components are provided on the first wall, second wall, and connecting wall for draining water from the wall surface. Each drainage component includes several horizontally arranged and vertically aligned transverse water collection channels. A vertical guide pipe is provided in the middle of each transverse water collection channel, penetrating all the transverse water collection channels. A water outlet is provided between the vertical guide pipe and the transverse water collection channels. A drain outlet is provided at the lower end of the vertical guide pipe for connection to the drainage pipe. This invention can collect and discharge rainwater on the curtain wall, preventing rainwater from flowing to the ground and affecting wall corners, and preventing obstruction of passage near the wall surface. However, this solution mainly targets the collection of surface water on the outer surface of the curtain wall. For water that has seeped into the interior of the curtain wall profiles or cavities, its drainage path is limited, and it lacks the ability to prevent backflow and adapt to complex wind pressure environments.

[0004] For example, Chinese invention patent application CN224063695U (published on March 31, 2026) discloses a unitized curtain wall partition pressure-equalizing drainage multi-directional diversion device. This utility model includes a base plate, with a first mounting bracket and a second mounting bracket fixedly connected to its surface. Both the first and second mounting brackets are snap-fitted with connecting brackets. Dust-tightening blocks are snap-fitted to the surface of the connecting brackets, and water-tightening blocks are snap-fitted to the surface of the first mounting bracket. An air-tightening block is fixedly connected to one side of the first mounting bracket. The first and second mounting brackets form two pressure-equalizing chambers, namely the first pressure-equalizing chamber and the second pressure-equalizing chamber. A drain outlet is provided on one side of the base plate. The base plate, the first mounting bracket, and the second mounting bracket are all integrally formed from aluminum alloy or stainless steel. This invention solves the problems of poor drainage, easy water accumulation leading to leakage, and other issues often found in traditional curtain wall drainage systems, which affect the service life of the curtain wall and the waterproof performance of the building. The solution has made improvements in pressure equalization drainage and dust prevention, but its structure is relatively complex. It mainly focuses on drainage of the interlayer unit itself and does not provide a complete solution for the design of a systematic vertical drainage path that runs through multiple floors from top to bottom, as well as bottom water collection and moisture-proof treatment.

[0005] Based on the above problems, it is necessary to provide a curtain wall drainage system and its construction method that can achieve graded water interception, horizontal water collection, vertical drainage, bottom water collection, unidirectional outward discharge, backflow prevention, blockage prevention, and construction inspection. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a curtain wall drainage system, including: a glass panel, a vertical frame, a sealing component, an upper horizontal drainage groove, a vertical drainage channel, a connecting pipe, a bottom water collection trough, a bottom horizontal drainage groove, and a drainage outlet; The glass panel is installed on the outside of the vertical frame, and the sealing component is disposed between the glass panel and the vertical frame; The upper horizontal drainage groove is located inside the horizontal component of the curtain wall and is connected to the vertical drainage channel; The vertical drainage channel is set along the height direction of the vertical frame and is used to guide the water entering the curtain wall cavity downward. The connecting pipe is installed between adjacent drainage chambers or adjacent vertical drainage channels to balance the water volume of adjacent drainage paths and form a connecting guide. The bottom water collection trough is located at the bottom of the curtain wall, and the lower end of the vertical drainage channel is connected to the bottom water collection trough. The bottom horizontal drainage channel is connected to the bottom water collection channel and is connected to the drainage outlet; The drainage outlet is oriented towards the outside and is used to discharge the water in the bottom horizontal drainage channel to the outside.

[0007] Furthermore, the sealing assembly includes a sealing strip, a pressure plate, and sealant. The sealing strip is disposed between the glass panel and the vertical frame. The pressure plate is pressed against the outer side or edge of the glass panel. The sealant fills the joint between the glass panel, the pressure plate, and the vertical frame.

[0008] Furthermore, a vertical drainage channel, independent of the main body mounting cavity, is provided inside the vertical frame, and the vertical drainage channel is connected to the curtain wall cavity on the back side of the glass panel.

[0009] Furthermore, the upper horizontal drainage groove is provided in the horizontal beam of the standard floor of the curtain wall or in the horizontal connecting component. The upper horizontal drainage groove extends horizontally along the curtain wall and is connected to the vertical drainage channel near the vertical frame.

[0010] Furthermore, the bottom water collection trough is located on the inner side of the bottom of the curtain wall, and the bottom of the bottom water collection trough is inclined towards the bottom horizontal drainage trough.

[0011] Furthermore, the bottom horizontal drainage channel is located on the side of the bottom water collection tank closest to the outside, and the drainage outlet is located at the outer end or bottom of the bottom horizontal drainage channel.

[0012] Furthermore, an insect-proof and anti-clogging net is provided at the drainage outlet, and the insect-proof and anti-clogging net covers the outside or inside of the drainage outlet.

[0013] Furthermore, an anti-backflow baffle is provided in the bottom horizontal drainage channel, and the anti-backflow baffle is located between the drainage outlet and the bottom water collection channel.

[0014] Furthermore, the anti-backflow baffle is an inclined baffle, an arc-shaped baffle, or a baffle with a one-way opening structure.

[0015] Furthermore, the curtain wall drainage system also includes an overflow outlet, which is located on the side wall of the bottom water collection tank or the vertical drainage channel. When the water level exceeds a predetermined height, the water enters the backup drainage path through the overflow outlet.

[0016] Furthermore, the curtain wall drainage system also includes a drip groove, which is located on the lower edge of the outdoor side near the drainage outlet to prevent water from flowing back along the outer surface or bottom components of the curtain wall.

[0017] Furthermore, the curtain wall drainage system also includes a waterproof layer and a moisture-proof isolation layer. The waterproof layer is disposed between the curtain wall and the building structure, and the moisture-proof isolation layer is disposed between the bottom water collection tank and the building structure.

[0018] Furthermore, multiple drainage outlets are provided at horizontal intervals along the curtain wall, and each of the multiple drainage outlets is connected to the same bottom horizontal drainage channel.

[0019] Furthermore, the upper horizontal drainage trough, vertical drainage channel, bottom water collection trough, bottom horizontal drainage trough, and drainage outlet together form a graded drainage channel from top to bottom and from inside to outside.

[0020] The present invention also provides a construction method for a curtain wall drainage system, comprising the following steps: S1. Complete the construction of the basic building structure and install embedded parts or connectors on the building structure; S2. Install the vertical frame and horizontal components, and adjust the positions of the vertical frame and horizontal components; S3. Lay a waterproof layer and a moisture-proof barrier layer between the curtain wall and the building structure; S4. An upper horizontal drainage groove is provided in the horizontal component, and a vertical drainage channel is provided in the vertical frame, and the upper horizontal drainage groove is connected to the vertical drainage channel. S5. Install the glass panel, and place a sealing strip, pressure plate, and sealant between the glass panel and the vertical frame; S6. Install a bottom water collection trough, a bottom horizontal drainage trough, and a drainage outlet at the bottom of the curtain wall, and connect the vertical drainage channel, the bottom water collection trough, the bottom horizontal drainage trough, and the drainage outlet in sequence. S7. Install anti-backflow baffles, overflow outlets, insect-proof and anti-clogging nets, and drip line grooves; S8. Conduct a water spray test on the curtain wall drainage system to check the drainage flow and sealing performance.

[0021] Furthermore, in step S8, the water spray test includes continuously spraying water on the outside of the curtain wall, allowing the water to enter the upper horizontal drainage channel or vertical drainage channel, and observing whether the drainage outlet continuously drains water and whether leakage occurs on the indoor side.

[0022] Compared with existing technologies, the advantages and effects of this application are as follows: 1. This application constructs a complete drainage channel from top to bottom and from the inside out through a path design of "upper horizontal drainage outlet → vertical drainage channel → bottom water collection tank → bottom horizontal drainage channel → drainage outlet". Even if the first outer seal fails, water that seeps into the curtain wall cavity can be effectively intercepted and actively discharged outdoors, realizing a composite waterproofing mode from "single sealing waterproofing" to "sealing + active drainage", significantly reducing the risk of indoor leakage.

[0023] 2. By installing connecting pipes between adjacent vertical drainage channels, this invention ensures a dynamic balance of water volume among the drainage paths. When a channel is overloaded or partially blocked, water can be automatically diverted to adjacent channels, effectively preventing localized water accumulation. Simultaneously, the overflow outlet provides an additional safety margin, serving as a backup drainage path under extreme rainstorm conditions to prevent backflow into the building due to excessively high water levels, greatly improving the reliability of the drainage system under complex operating conditions.

[0024] 3. The anti-backflow baffle installed in the bottom horizontal drainage channel of this application can automatically block outdoor rainwater from flowing back into the curtain wall when there are drastic changes in external wind pressure or heavy rain, solving the problem that traditional drainage outlets become "water inlets" in severe weather. Combined with the drip line groove on the lower edge of the outdoor side, it can effectively cut off the path of water creep and backflow, ensuring the dryness of the bottom of the curtain wall and surrounding structures.

[0025] 4. The insect-proof and anti-clogging net installed at the drainage outlet of this application effectively intercepts insects, fallen leaves, and construction debris through physical means, solving the common problem of drainage outlet blockage at its source. At the same time, the combined application of the waterproof layer and the moisture-proof isolation layer prevents moisture from migrating from the bottom water accumulation area to the building structure and insulation layer, protecting the safety of the main structure and extending the overall service life of the curtain wall system.

[0026] 5. The construction method provided in this application strictly follows the scientific sequence of "main frame first, drainage system second, and sealing installation third," and specifies clear sealing and slope requirements for key connecting nodes. Finally, a mandatory water spray test is conducted for overall inspection to ensure that each drainage structure works effectively, avoiding "false drainage" or "dead drainage" problems caused by improper construction, and facilitating project acceptance and quality control.

[0027] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the preferred embodiments of this application are described in detail below with reference to the accompanying drawings.

[0028] The above and other objects, advantages and features of this application will become more apparent to those skilled in the art from the following detailed description of specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0030] in: Figure 1 This is a plan view of a curtain wall drainage system; Figure 2 This is a cross-sectional view of a curtain wall drainage system; Figure 3 This is a flowchart of a construction method for a curtain wall drainage system.

[0031] Explanation of reference numerals in the attached drawings: 1-Glass panel; 2-Vertical frame; 3-Sealing strip; 4-Pressure plate; 5-Upper horizontal drainage groove; 6-Vertical drainage channel; 7-Connecting pipe; 8-Waterproof layer; 9-Building structure; 10-Moisture-proof isolation layer; 11-Overflow outlet; 12-Bottom water collection trough; 13-Bottom horizontal drainage groove; 14-Sealing adhesive. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. In the following description, specific details such as specific configurations and components are provided merely to help fully understand the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. In addition, for clarity and brevity, descriptions of known functions and structures are omitted in the embodiments.

[0033] It should be understood that the phrase "an embodiment" or "this embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "an embodiment" or "this embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0034] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0035] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it have an "or" relationship.

[0036] In this article, the term "at least one" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, "at least one of A and B" can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0037] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0038] Example 1 This embodiment describes a curtain wall drainage system.

[0039] Please refer to Figure 1 As shown, Figure 1 This is a plan view of a curtain wall drainage system.

[0040] A curtain wall drainage system includes: a glass panel 1, a vertical frame 2, a sealing component, an upper horizontal drainage groove 5, a vertical drainage channel 6, a connecting pipe 7, a bottom water collection groove 12, a bottom horizontal drainage groove 13, and a drainage outlet. The glass panel 1 is installed on the outside of the vertical frame 2, and the sealing assembly is disposed between the glass panel 1 and the vertical frame 2; The upper horizontal drainage slot 5 is located inside the horizontal component of the curtain wall and is connected to the vertical drainage channel 6. The vertical drainage channel 6 is set along the height direction of the vertical frame 2 and is used to guide the water entering the curtain wall cavity downward. The connecting pipe 7 is disposed between adjacent drainage chambers or adjacent vertical drainage channels 6 to balance the water volume of adjacent drainage paths and form a connecting guide. The bottom water collection trough 12 is located at the bottom of the curtain wall, and the lower end of the vertical drainage channel 6 is connected to the bottom water collection trough 12. The bottom horizontal drainage channel 13 is connected to the bottom water collection channel 12 and is connected to the drainage outlet; The drainage outlet is oriented towards the outside and is used to discharge the water in the bottom horizontal drainage channel 13 to the outside.

[0041] The technical advantages of this embodiment are as follows: A standard drainage path, consisting of an upper horizontal drainage outlet, a vertical drainage channel, a bottom water collection trough, a bottom horizontal drainage channel, and a drainage outlet, combined with connecting pipes to achieve cross-path water balance, realizes basic, efficient, and balanced drainage of curtain wall leakage. Its core advantage lies in establishing a continuous, reliable, and systematic drainage framework, solving the fundamental problems of single drainage paths and easy interruptions in existing technologies.

[0042] Example 2 Based on Embodiment 1, this embodiment discloses a curtain wall drainage system.

[0043] Please refer to Figure 2 As shown, Figure 2 This is a cross-sectional view of a curtain wall drainage system.

[0044] Furthermore, the sealing assembly includes a sealing strip 3, a pressure plate 4, and a sealant 14. The sealing strip 3 is disposed between the glass panel 1 and the vertical frame 2. The pressure plate 4 is pressed against the outer side or edge of the glass panel 1. The sealant 14 fills the joint between the glass panel 1, the pressure plate 4, and the vertical frame 2.

[0045] Furthermore, the vertical frame 2 is provided with a vertical drainage channel 6 that is independent of the main body mounting cavity, and the vertical drainage channel 6 is connected to the curtain wall cavity on the back side of the glass panel 1.

[0046] Furthermore, the upper horizontal drainage groove 5 is provided in the horizontal beam of the standard floor of the curtain wall or the horizontal connecting component. The upper horizontal drainage groove 5 extends horizontally along the curtain wall and is connected to the vertical drainage channel 6 near the vertical frame 2.

[0047] Furthermore, the bottom water collection trough 12 is located on the inner side of the bottom of the curtain wall, and the bottom of the bottom water collection trough 12 is inclined towards the bottom horizontal drainage trough 13.

[0048] Furthermore, the bottom horizontal drainage channel 13 is located on the side of the bottom water collection channel 12 near the outside, and the drainage outlet is located at the outer end or bottom of the bottom horizontal drainage channel 13.

[0049] Furthermore, an insect-proof and anti-clogging net is provided at the drainage outlet, and the insect-proof and anti-clogging net covers the outside or inside of the drainage outlet.

[0050] Furthermore, an anti-backflow baffle is provided in the bottom horizontal drainage channel 13, and the anti-backflow baffle is located between the drainage outlet and the bottom water collection channel 12.

[0051] Furthermore, the anti-backflow baffle is an inclined baffle, an arc-shaped baffle, or a baffle with a one-way opening structure.

[0052] Furthermore, the curtain wall drainage system also includes an overflow outlet 11, which is located on the side wall of the bottom water collection tank 12 or the vertical drainage channel 6. When the water level exceeds a predetermined height, the water enters the backup drainage path through the overflow outlet 11.

[0053] Furthermore, the curtain wall drainage system also includes a drip groove, which is located on the lower edge of the outdoor side near the drainage outlet to prevent water from flowing back along the outer surface or bottom components of the curtain wall.

[0054] Furthermore, the curtain wall drainage system also includes a waterproof layer 8 and a moisture-proof isolation layer 10. The waterproof layer 8 is disposed between the curtain wall and the building structure 9, and the moisture-proof isolation layer 10 is disposed between the bottom water collection tank 12 and the building structure 9.

[0055] Furthermore, multiple drainage outlets are provided at horizontal intervals along the curtain wall, and each of the multiple drainage outlets is connected to the same bottom horizontal drainage channel 13.

[0056] Furthermore, the upper horizontal drainage trough 5, the vertical drainage channel 6, the bottom water collection trough 12, the bottom horizontal drainage trough 13, and the drainage outlet together form a graded drainage channel from top to bottom and from inside to outside.

[0057] The technical effect of this embodiment: The graded drainage channel specified in this embodiment is a high-level summary of the core inventive concept of this invention. Its technical effect is to realize the orderly, layered and directional discharge of water, so that the drainage behavior changes from disordered infiltration to orderly and controllable.

[0058] Example 3 Based on Example 1, this example discloses a construction method for a curtain wall drainage system.

[0059] Please refer to Figure 3 As shown, Figure 3 This is a flowchart of a construction method for a curtain wall drainage system.

[0060] The present invention also provides a construction method for a curtain wall drainage system, comprising the following steps: S1. Complete the construction of the base building structure 9, and install embedded parts or connectors on the building structure 9; S2. Install the vertical frame 2 and the horizontal component, and adjust the positions of the vertical frame 2 and the horizontal component; S3. Lay a waterproof layer 8 and a moisture-proof isolation layer 10 between the curtain wall and the building structure 9; S4. An upper horizontal drainage groove 5 is provided in the horizontal component, and a vertical drainage channel 6 is provided in the vertical frame 2, and the upper horizontal drainage groove 5 is connected to the vertical drainage channel 6. S5. Install glass panel 1, and set sealing strip 3, pressure plate 4 and sealant 14 between glass panel 1 and vertical frame 2; S6. Install a bottom water collection trough 12, a bottom horizontal drainage trough 13 and a drainage outlet at the bottom of the curtain wall, and connect the vertical drainage channel 6, the bottom water collection trough 12, the bottom horizontal drainage trough 13 and the drainage outlet in sequence. S7. Install anti-backflow baffle, overflow outlet 11, insect-proof and anti-clogging net and drip line groove; S8. Conduct a water spray test on the curtain wall drainage system to check the drainage flow and sealing performance.

[0061] Furthermore, in step S8, the water spray test includes continuously spraying water on the outside of the curtain wall, allowing the water to enter the upper horizontal drainage channel 5 or the vertical drainage channel 6, and observing whether the drainage outlet continuously drains water and whether leakage occurs on the indoor side.

[0062] The technical effect of this embodiment is that it transforms the structural design into executable and verifiable engineering steps. Through the constraints of steps S1-S8, particularly S4 (drainage channel connection), S6 (bottom device installation sequence), and S8 (mandatory water spray test), it ensures that all the aforementioned structural features can be accurately and effectively implemented. The water spray test, as the final checkpoint for construction acceptance, can promptly expose defects in the drainage path, guaranteeing the goal of the curtain wall drainage system being "usable immediately upon completion and functionally unobstructed" from a construction process perspective.

[0063] The above description is merely a preferred embodiment of the present invention and does not limit the scope of protection of the present invention. Various modifications and variations are possible with respect to the present invention. Any changes, modifications, substitutions, integrations, and parameter alterations to these embodiments within the spirit and principles of the present invention fall within the scope of protection of the claims of the present invention.

Claims

1. A curtain wall drainage system, characterized in that, include: Glass panel (1), vertical frame (2), sealing assembly, upper horizontal drainage groove (5), vertical drainage channel (6), connecting pipe (7), bottom water collection groove (12), bottom horizontal drainage groove (13) and drainage outlet; The glass panel (1) is installed on the outside of the vertical frame (2), and the sealing assembly is disposed between the glass panel (1) and the vertical frame (2); The upper horizontal drainage slot (5) is located inside the horizontal component of the curtain wall and is connected to the vertical drainage channel (6); The vertical drainage channel (6) is set along the height direction of the vertical frame (2) to guide the water entering the curtain wall cavity downward; The connecting pipe (7) is set between adjacent drainage chambers or adjacent vertical drainage channels (6) to balance the water volume of adjacent drainage paths and form a connecting guide. The bottom water collection trough (12) is located at the bottom of the curtain wall, and the lower end of the vertical drainage channel (6) is connected to the bottom water collection trough (12); The bottom horizontal drainage channel (13) is connected to the bottom water collection channel (12) and is connected to the drainage outlet; The drainage outlet is oriented towards the outside and is used to discharge the water in the bottom horizontal drainage channel (13) to the outside.

2. The curtain wall drainage system according to claim 1, characterized in that, The sealing assembly includes a sealing strip (3), a pressure plate (4), and a sealant (14). The sealing strip (3) is disposed between the glass panel (1) and the vertical frame (2). The pressure plate (4) is pressed against the outer side or edge of the glass panel (1). The sealant (14) fills the joint between the glass panel (1), the pressure plate (4), and the vertical frame (2).

3. A curtain wall drainage system according to claim 1 or 2, characterized in that, The vertical frame (2) is provided with a vertical drainage channel (6) that is independent of the main body installation cavity. The vertical drainage channel (6) is connected to the curtain wall cavity on the back side of the glass panel (1).

4. A curtain wall drainage system according to claim 3, characterized in that, The upper horizontal drainage slot (5) is located in the horizontal beam of the standard floor of the curtain wall or in the horizontal connecting component. The upper horizontal drainage slot (5) extends horizontally along the curtain wall and is connected to the vertical drainage channel (6) near the vertical frame (2).

5. A curtain wall drainage system according to claim 4, characterized in that, A backflow prevention baffle is provided in the bottom horizontal drainage channel (13), and the backflow prevention baffle is located between the drainage outlet and the bottom water collection channel (12).

6. A curtain wall drainage system according to claim 5, characterized in that, The curtain wall drainage system also includes an overflow outlet (11), which is located on the side wall of the bottom water collection tank (12) or the vertical drainage channel (6). When the water level exceeds a predetermined height, the water enters the backup drainage path through the overflow outlet (11).

7. A curtain wall drainage system according to claim 6, characterized in that, The curtain wall drainage system also includes a waterproof layer (8) and a moisture-proof isolation layer (10). The waterproof layer (8) is located between the curtain wall and the building structure (9), and the moisture-proof isolation layer (10) is located between the bottom water collection tank (12) and the building structure (9).

8. A curtain wall drainage system according to claim 7, characterized in that, The upper horizontal drainage trough (5), vertical drainage channel (6), bottom water collection trough (12), bottom horizontal drainage trough (13) and drainage outlet together form a graded drainage channel from top to bottom and from inside to outside.

9. The construction method of the curtain wall drainage system according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Complete the construction of the basic building structure (9) and install embedded parts or connectors on the building structure (9); S2. Install the vertical frame (2) and the horizontal component, and adjust the position of the vertical frame (2) and the horizontal component; S3. Lay a waterproof layer (8) and a moisture-proof isolation layer (10) between the curtain wall and the building structure (9). S4. An upper horizontal drainage groove (5) is provided in the horizontal component, and a vertical drainage channel (6) is provided in the vertical frame (2), and the upper horizontal drainage groove (5) is connected to the vertical drainage channel (6); S5. Install the glass panel (1) and set a sealing strip (3), a pressure plate (4) and sealant (14) between the glass panel (1) and the vertical frame (2). S6. Install a bottom water collection trough (12), a bottom horizontal drainage trough (13) and a drainage outlet at the bottom of the curtain wall, and connect the vertical drainage channel (6), the bottom water collection trough (12), the bottom horizontal drainage trough (13) and the drainage outlet in sequence. S7. Install anti-backflow baffles, overflow outlets (11), insect-proof and anti-clogging nets and drip line grooves; S8. Conduct a water spray test on the curtain wall drainage system to check the drainage flow and sealing performance.

10. The construction method of the curtain wall drainage system according to claim 9, characterized in that, In step S8, the water spray test includes continuously spraying water on the outside of the curtain wall so that the water enters the upper horizontal drainage channel (5) or the vertical drainage channel (6), and observing whether the drainage outlet drains continuously and whether there is leakage on the indoor side.

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