A rainproof device for concrete roof air pipe

Abstract

The utility model discloses a kind of concrete roofing air pipe rainproof devices, solve the problem of rain leakage of air pipe through concrete roofing.The device includes air pipe rainproof device, indoor air pipe, outdoor air pipe, air pipe support, concrete roofing air pipe hole, roofing floor, roofing insulation layer, roofing waterproof layer, roofing hole flanging and cement mortar;Air pipe rainproof device is composed of indoor and outdoor connecting air pipe and rain cover, indoor and outdoor connecting air pipe two ends are connected indoor, outdoor air pipe respectively through air pipe flange, and fixed by air pipe support and roofing hole flanging;Rain cover contains hem, skirt, vertical edge and middle support column, can be enclosed rainproof space and cover hole flanging, hole gap is blocked with non-combustible material.The device is adapted to rectangle / circle, heat preservation / cold preservation / non-heat preservation metal air pipe, rainproof effect is remarkable, structure is stable and durable, construction is convenient, can guarantee indoor environment and ventilation system safe operation.

Description

Technical Field

[0001] This utility model relates to a rainproof device, specifically a rainproof device for a ductwork protruding from a concrete roof. Background Technology

[0002] In building ventilation systems, it is common for ducts to extend through concrete roofs. When ducts extend through the roof, if there is a lack of effective rain protection, rainwater can easily seep into the room through the gap between the duct and the roof opening, which can have adverse effects on the indoor environment, equipment, and building structure, such as damaging interior decoration, corroding ducts and related equipment, and reducing the durability of the building structure.

[0003] Currently, although some measures exist for rain protection of roof ducts, they have many shortcomings. Some rainproof structures are simple, using only basic water-blocking panels, resulting in poor rain protection and difficulty in coping with different wind and rain weather. Some rainproof devices are not well-suited for the compatibility between ducts and roof openings, failing to flexibly adapt to ducts of different cross-sectional sizes and protection requirements, easily leading to gaps and leaks after installation. Other rainproof devices have defects in structural strength and durability, easily deforming and rusting after long-term exposure to wind, sun, and rain, losing their rainproof function and increasing later maintenance costs.

[0004] Meanwhile, in terms of duct material application, there are problems such as the lack of proper isolation when connecting galvanized steel sheet ducts and stainless steel flanges, which can easily lead to electrochemical corrosion; and the poor construction sequence and structural coordination of duct insulation protection and rainproof device installation have affected the overall rainproof and protective effect, failing to meet the requirements of long-term stable and reliable operation of building ventilation systems and effective protection of the building space environment. Utility Model Content

[0005] The purpose of this utility model is to provide a rainproof device for ducts exiting concrete roofs, which solves the problems of poor rainproof effect, poor adaptability, easy corrosion and deformation, and poor synergy with duct protection when ducts exit concrete roofs.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a rainproof device for ducts on concrete roofs, including a duct rainproof component, an indoor duct, an outdoor duct, a duct support, a duct opening on a concrete roof, a roof slab, a roof insulation layer, a roof waterproof layer, a roof opening flange, and cement mortar. The duct rainproof assembly includes an indoor and outdoor connecting duct and a rainproof cover at the roof opening. The indoor duct and the outdoor duct are respectively connected to the indoor and outdoor connecting duct through corresponding duct flanges. The duct rainproof assembly is fixed to the roof opening by the duct bracket. Before the duct rainproof assembly is installed, the riveting or welding fixing process between the indoor and outdoor connecting duct and the duct bracket is completed. The rain cover and the indoor and outdoor connecting air ducts enclose a rainproof space. The roof floor slab, the roof insulation layer, the roof waterproof layer, and the cement mortar form the roof building structure. The concrete roof air duct opening is formed between the air duct rainproof component and the cement mortar.

[0007] As a preferred embodiment of the rainproof device for ductwork on concrete roofs, the indoor and outdoor connecting ducts and the rainproof cover of the ductwork rainproof assembly are both made of stainless steel plate. The wall thickness of the indoor and outdoor connecting duct is not less than 2mm, the length of the indoor and outdoor connecting duct is greater than the sum of the height of the roof opening flange and the height of the rainproof cover, and the length of the indoor and outdoor connecting duct is not less than 1250mm.

[0008] As a preferred embodiment of the rainproof device for the ductwork on the concrete roof, the rainproof cover includes a rainproof cover edge, a rainproof cover skirt, and a rainproof cover vertical edge. The thickness of the rainproof cover is the same as the thickness of the indoor and outdoor connecting ductwork. The rainproof cover edge is welded to the indoor and outdoor connecting ductwork, and the weld between the rainproof cover edge and the indoor and outdoor connecting ductwork is fully welded along its upper and lower circumferences.

[0009] As a preferred embodiment of the rainproof device for the ductwork on the concrete roof, the height of the edge of the rainproof cover is 200mm; the angle α between the skirt of the rainproof cover and the vertical axial centerline of the indoor and outdoor connecting ductwork is 45°-75°. The height of the vertical edge of the rain cover is 200mm, the gap between the vertical edge of the rain cover and the flange sidewall of the roof opening is 100mm, and the vertical edge of the rain cover covers the flange of the concrete roof duct opening.

[0010] As a preferred solution for the rainproof device for the ductwork on the concrete roof, the rainproof cover also includes a central support column, and 100mm×100mm stainless steel plate embedded parts are reserved around the center line of the roof opening flange and at 1 / 4 of each side of each edge. The lower end of the intermediate support column is welded to the stainless steel plate embedded part of the roof opening flange, and the upper end of the intermediate support column is welded to the rainproof cover skirt.

[0011] As a preferred solution for rainproof devices for ductwork on concrete roofs, the intermediate support column is made of stainless steel round bar or steel pipe with a diameter of 10mm.

[0012] As a preferred embodiment of the rainproof device for the ventilation ducts on concrete roofs, both the indoor and outdoor ventilation ducts are rectangular or circular; both the indoor and outdoor ventilation ducts are made of galvanized steel or stainless steel; and both the indoor and outdoor ventilation ducts are one of the following: insulated, cold-insulated, or uninsulated.

[0013] As a preferred solution for rainproof devices for ductwork on concrete roofs, when the indoor or outdoor ductwork is made of galvanized steel sheet, an insulating gasket is used to isolate the connection between the galvanized angle steel flange of the galvanized steel sheet and the duct flange. It also includes duct insulation material and an outer protective layer. Under the condition of heat preservation, the duct insulation material is attached to the outer surface of the duct wall of the indoor duct, the outdoor duct, and the indoor-outdoor connecting duct. In the cold insulation state, the duct insulation material is attached to the outer surface of the duct wall, and the outer protective layer is wrapped around the outside of the duct insulation material.

[0014] As a preferred option for rainproof devices for ductwork on concrete roofs, the outer protective layer is made of galvanized iron sheet with a thickness of 0.3-0.5mm, or aluminum or aluminum alloy plate with a thickness of 0.6mm, or aluminum or aluminum alloy plate with a thickness of 0.8mm.

[0015] As a preferred embodiment of the rainproof device for the ductwork on the concrete roof, the rectangular opening of the ductwork on the concrete roof has a side length 80-100mm larger than the side of the outer protective layer, and the circular opening has a diameter 80-100mm larger than the diameter of the outer protective layer. The gaps in the ductwork openings on the concrete roof are sealed with non-combustible materials. The roof opening flange is 300mm higher than the finished building surface, and the width of the roof opening flange is 100-150mm.

[0016] The beneficial effects of this utility model are as follows: First, it has a significant rainproof effect. By enclosing the rainproof cover with the indoor and outdoor connecting ducts to form a rainproof space, and combined with the design of the rainproof cover's vertical edge covering the roof opening, it can completely block rainwater from seeping into the room through the gaps in the roof openings of the ducts, thus completely eliminating the problem of rain leakage and ensuring the cleanliness of the indoor environment and the safety of the equipment.

[0017] Secondly, it has strong adaptability and can be compatible with metal ducts with rectangular or circular cross-sections. It can also meet the needs of insulated, cold-insulated and uninsulated ducts. At the same time, through reasonable opening size design, it can be adapted to the installation of ducts of different specifications, and has a wide range of applicable scenarios.

[0018] Third, the structure has high stability and durability. The rainproof components of the air duct are made of stainless steel plates, and the wall thickness and length meet the strength requirements. The intermediate support column is welded and fixed to the reserved embedded parts to enhance the overall structural support. Furthermore, when the galvanized steel plate air duct is connected to the air duct flange, isolation measures are set to avoid electrochemical corrosion and extend the service life of the device.

[0019] Fourth, the construction is convenient and efficient. The duct rainproof components can be prefabricated during the duct manufacturing process. Before installation, the duct and bracket fixing and the heat insulation protection construction under the rainproof cover can be completed in advance, which greatly reduces the difficulty of installation and welding at the roof opening and shortens the construction cycle.

[0020] Fifth, it has a good synergistic protection effect. The insulation material and outer protective layer can effectively isolate the heat exchange between the medium inside the air duct and the outdoor air. Moreover, the insulation construction and rainproof device installation sequence is reasonable, which not only ensures the heat preservation and cold preservation effect, but also enhances the overall rainproof protection performance and improves the operational stability of the ventilation and air conditioning system. Attached Figure Description

[0021] To more clearly illustrate the embodiments of the present invention or the technical solutions in 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 merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0023] Figure 1 This is a schematic diagram of the civil engineering and indoor air ductwork provided in the embodiments of this utility model when no rainproof device is installed.

[0024] Figure 2 This is a schematic diagram of a rainproof device for a concrete roof duct provided in an embodiment of this utility model.

[0025] Figure 3 This is a schematic cross-sectional view of the rainproof device for the concrete roof duct provided in the embodiment of this utility model.

[0026] In the diagram, 1. Duct rainproof component; 2. Duct opening in concrete roof; 3. Roof slab; 4. Roof insulation layer; 5. Roof waterproof layer; 6. Roof opening flange; 7. Cement mortar; 8. Duct support; 9. Rain cover; 10. Indoor / outdoor connecting duct; 11. Indoor duct; 12. Outdoor duct; 13. Duct wall; 14. Duct insulation material; 15. Outer protective layer; 16. Galvanized angle steel flange; 17. Duct flange; 901. Rain cover edge; 902. Rain cover skirt; 903. Rain cover vertical edge; 904. Intermediate support column; 905. Weld; 906. Opening flange centerline; 907. Stainless steel plate embedded part. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] See Figure 1 , Figure 2 and Figure 3 This utility model provides a rainproof device for a concrete roof duct, including a duct rainproof component 1, an indoor duct 11, an outdoor duct 12, a duct support 8, a concrete roof duct opening 2, a roof floor slab 3, a roof insulation layer 4, a roof waterproof layer 5, a roof opening flange 6, and cement mortar 7. The duct rainproof component 1 includes an indoor and outdoor connecting duct 10 and a rainproof cover 9 at the roof opening. The indoor duct 11 and the outdoor duct 12 are connected to the indoor and outdoor connecting duct 10 through corresponding duct flanges 17. The duct rainproof component 1 is fixed to the roof opening flange 6 through the duct bracket 8. Before the installation of the duct rainproof component 1, the riveting or welding fixing process between the indoor and outdoor connecting duct 10 and the duct bracket 8 is completed. The rainproof cover 9 and the indoor and outdoor connecting duct 10 enclose a rainproof space. The roof floor slab 3, the roof insulation layer 4, the roof waterproof layer 5 and the cement mortar 7 form the roof building structure. The concrete roof duct opening 2 is formed between the duct rainproof component 1 and the cement mortar 7.

[0030] Specifically, the indoor duct 11 and outdoor duct 12 are connected to the indoor / outdoor connecting duct 10 via duct flange 17, achieving duct continuity and meeting ventilation requirements. The duct rainproof component 1 is fixed to the roof opening flange 6 via duct bracket 8, ensuring overall structural stability. Before installation, the indoor / outdoor connecting duct 10 and duct bracket 8 are riveted or welded to ensure installation firmness. The rainproof cover 9 and the indoor / outdoor connecting duct 10 enclose a rainproof space, preventing rainwater from entering. The roof structure formed by the roof slab 3, roof insulation layer 4, roof waterproof layer 5, and cement mortar 7 provides the installation foundation and waterproof guarantee for the device. The concrete roof duct opening 2 provides a passage for the duct to pass through the roof, and a seal is achieved through cooperation with the cement mortar 7.

[0031] In one possible embodiment, the indoor and outdoor connecting duct 10 and the rain cover 9 of the duct rainproof assembly 1 are both made of stainless steel plate material. The wall thickness of the indoor and outdoor connecting duct 10 is not less than 2mm. The length of the indoor and outdoor connecting duct 10 is greater than the sum of the height of the roof opening flange 6 and the height of the rain cover 9. The length of the indoor and outdoor connecting duct 10 is not less than 1250mm.

[0032] Specifically, the indoor and outdoor connecting duct 10 and the rain cover 9 are made of stainless steel plate. Utilizing the corrosion resistance and high strength of stainless steel, the service life of the device is extended, and it adapts to the complex environment of the roof. The wall thickness 13 of the indoor and outdoor connecting duct 10 is no less than 2mm to ensure sufficient structural strength to withstand its own load and the load of the external environment. Its length is greater than the sum of the height of the roof opening flange 6 and the height of the rain cover 9, and no less than 1250mm, ensuring that the duct has sufficient length to pass through the roof and install the rain cover 9, while also providing a reasonable installation position for the rain cover 9 to enhance its rainproof effect.

[0033] In one possible embodiment, the rain cover 9 includes a rain cover edge 901, a rain cover skirt 902, and a rain cover vertical edge 903. The thickness of the rain cover 9 is the same as the thickness of the indoor and outdoor connecting air duct 10. The rain cover edge 901 is welded to the indoor and outdoor connecting air duct 10, and the upper and lower circumferences of the weld 905 between the rain cover edge 901 and the indoor and outdoor connecting air duct 10 are fully welded.

[0034] Specifically, the rain cover 9 consists of a rain cover edge 901, a skirt, and a vertical edge, all of which work together to achieve the rainproof function. The thickness of the rain cover 9 is the same as that of the indoor and outdoor connecting duct 10, ensuring the consistency of the overall structure and the reliability of the connection. The rain cover edge 901 is welded to the indoor and outdoor connecting duct 10, and the weld 905 is fully welded around its upper and lower circumferences, ensuring a tight connection between the two and preventing rainwater from seeping in through the connection gaps, thus enhancing the sealing performance of the connection between the rain cover 9 and the duct.

[0035] In one possible embodiment, the height of the rain cover edge 901 is 200mm; the angle between the rain cover skirt 902 and the vertical axial centerline of the indoor / outdoor connecting duct 10 is... α The angle is 45°-75°; the height of the rain cover vertical edge 903 is 200mm, the gap between the rain cover vertical edge 903 and the side wall of the roof opening flange 6 is 100mm, and the rain cover vertical edge 903 covers the flange of the concrete roof duct opening 2.

[0036] Specifically, the rain cover edge 901 is 200mm high, providing sufficient contact area for the connection between the rain cover 9 and the duct, ensuring a firm weld. The angle between the rain cover skirt 902 and the vertical axial centerline of the indoor / outdoor connecting duct 10 is set between 45° and 75°. This angle range effectively guides rainwater to flow outwards while avoiding an excessively large angle that would cause the rain cover 9 to be too large or an excessively small angle that would affect drainage. The rain cover vertical edge 903 is 200mm high and covers the flange of the duct opening 2 in the concrete roof, preventing rainwater from directly entering the opening. The 100mm gap between it and the side wall of the roof opening flange 6 ensures that the roof structure is not affected and also prevents rainwater from splashing in to a certain extent.

[0037] In one possible embodiment, the rain cover 9 further includes a central support column 904, and 100mm×100mm stainless steel plate embedded parts 907 are reserved around the center line 906 of the roof opening flange 6 and at 1 / 4 of each side of each side; the lower end of the central support column 904 is welded to the stainless steel plate embedded parts 907 of the roof opening flange 6, and the upper end of the central support column 904 is welded to the skirt 902 of the rain cover.

[0038] Specifically, the intermediate support column 904 provides additional support for the rain cover 9, enhancing its structural stability and preventing deformation under external forces such as wind and rain. The stainless steel embedded part 907 reserved in the roof opening flange 6 provides a solid connection foundation for the intermediate support column 904. The lower end of the intermediate support column 904 is welded to the embedded part, and the upper end is welded to the rain cover skirt 902, forming a stable support structure that transfers the load on the rain cover 9 to the roof opening flange 6, ensuring the long-term stable operation of the rain cover 9.

[0039] In one possible embodiment, the intermediate support column 904 is made of stainless steel round bar or steel pipe with a diameter of 10mm. Specifically, the 10mm diameter stainless steel round bar or steel pipe has sufficient strength and rigidity to meet the support requirements of the rain cover 9. Using stainless steel can prevent the support column from rusting and corroding, ensuring the durability and reliability of the support, and matching the corrosion resistance requirements of the overall device.

[0040] In one possible embodiment, both the indoor duct 11 and the outdoor duct 12 are rectangular or circular ducts; both the indoor duct 11 and the outdoor duct 12 are made of galvanized steel or stainless steel; and both the indoor duct 11 and the outdoor duct 12 are insulated, cold-insulated, or uninsulated ducts.

[0041] Specifically, the indoor duct 11 and outdoor duct 12 are designed as rectangular or circular shapes to adapt to different building spaces and ventilation needs, improving the applicability of the device. They are made of galvanized steel or stainless steel, utilizing their good strength and corrosion resistance to ensure the service life of the ducts. They can be used as insulated, cold-insulated, or uninsulated ducts, and can be selected according to the actual temperature requirements of the ventilation medium to meet the temperature control requirements in different scenarios.

[0042] For ducts with different diameters or long side dimensions, under a certain working pressure, the material, specifications, and plate thickness of the duct wall 13 are selected according to the current national standard "GB50243-2016: Construction Quality Acceptance Specification for Ventilation and Air Conditioning Engineering" or according to design requirements.

[0043] In one possible embodiment, when the indoor duct 11 or the outdoor duct 12 is made of galvanized steel sheet, the connection between the galvanized angle steel flange 16 of the galvanized steel sheet and the duct flange 17 is isolated by an insulating gasket; it also includes duct insulation material 14 and an outer protective layer 15. In the heat preservation state, the duct insulation material 14 is attached to the outer surface of the duct wall 13 of the indoor duct 11, the outdoor duct 12, and the indoor-outdoor connecting duct 10; in the cold preservation state, the duct insulation material 14 is attached to the outer surface of the duct wall 13, and the outer protective layer 15 is wrapped around the outside of the duct insulation material 14.

[0044] Specifically, the connection between the galvanized angle steel flange 16 and the duct flange 17 is isolated by an insulating gasket, which prevents electrochemical corrosion caused by contact between two different metals, protects the flange connection structure, and extends service life. In the heat-insulating state, the duct insulation material 14 is fitted against the duct wall 13, reducing heat exchange between the medium inside the duct and the outside environment, thus achieving a heat-insulating effect. In the cold-insulating state, the insulation material is fitted against the duct wall 13, with the outer protective layer 15 wrapped around the outside, reducing cold loss and preventing moisture from the outside air from condensing on the duct wall 13, ensuring the cold-insulating effect and the service life of the duct.

[0045] In one possible embodiment, the outer protective layer 15 is selected from galvanized iron sheet with a thickness of 0.3-0.5 mm, or aluminum or aluminum alloy plate with a thickness of 0.6 mm, or aluminum or aluminum alloy plate with a thickness of 0.8 mm.

[0046] Specifically, these materials are selected as the outer protective layer 15 because they have excellent moisture-proof and corrosion-resistant properties, protecting the internal insulation materials from external environmental influences and ensuring insulation performance. Materials of different thicknesses can be selected according to the actual usage environment and protection needs to meet the protection requirements of different scenarios. At the same time, the materials themselves are lightweight and will not excessively increase the load on the duct.

[0047] In one possible embodiment, the rectangular opening 2 of the concrete roof duct has a side length 80-100mm larger than the side of the outer protective layer 15, and the circular opening has a diameter 80-100mm larger than the diameter of the outer protective layer 15. The gaps in the concrete roof duct opening 2 are sealed with non-combustible materials. The roof opening flange 6 is 300mm higher than the finished building surface, and the width of the roof opening flange 6 is 100-150mm.

[0048] Specifically, the duct opening 2 in the concrete roof is 80-100mm larger than the outer protective layer 15, providing sufficient space for duct installation and facilitating construction. Gaps in the opening are sealed with non-combustible materials to prevent the spread of flames during a fire, improving the building's fire safety. The roof opening flange 6 extends 300mm above the finished building surface, effectively preventing rainwater from flowing into the opening; its width of 100-150mm ensures sufficient strength and water-blocking effect without excessively occupying roof space.

[0049] The assembly process of this utility model is as follows: I. Prefabrication Stage (Completed in the factory / off-site)

[0050] 1. Prefabrication of air ducts and rainproof devices: Fabricate indoor air ducts 11, outdoor air ducts 12 and indoor-outdoor connecting air ducts 10 according to the design dimensions: If they are made of galvanized steel sheet, select sheet materials that conform to the standard of "GB50243-2016"; if they are made of stainless steel, ensure that the wall thickness 13 of the indoor-outdoor connecting air duct 10 is ≥2mm and the length is ≥1250mm, which must be greater than the sum of the height of the roof opening flange 6 and the height of the rainproof cover 9; Fabrication of Rain Cover 9: Use stainless steel plate of the same thickness as the indoor and outdoor connecting duct 10 to process the rain cover edge 901, skirt and vertical edge, where the edge height is 200mm and the vertical edge height is 200mm. The angle α between the skirt and the vertical axial center line of the duct is adjusted to 45°-75°. Weld the edge to the upper and lower circumferences of the indoor and outdoor connecting duct 10 to form a complete rain cover 9 assembly. The weld 905 must be flat and without any missing welds. Prefabricated duct flange 17: Stainless steel ducts are equipped with stainless steel flanges, and galvanized steel plate ducts are equipped with galvanized angle steel flanges 16. Insulating gaskets are also prepared for isolation when connecting galvanized angle steel flanges 16 and stainless steel flanges.

[0051] 2. Prefabrication of supporting components: Processing of intermediate support column 904: Use stainless steel round bar or steel pipe with a diameter of 10mm, cut to a length that matches the height of the roof opening flange 6 and the height of the rainproof cover skirt 902. Prepare stainless steel plate embedded parts 907: Cut stainless steel plates to 100mm×100mm size for pre-installation at 6 locations on the roof opening flange.

[0052] II. Roof Pre-treatment Stage

[0053] 1. Roof structure preparation: Confirm that the roof slab 3, roof insulation layer 4, roof waterproof layer 5, and cement mortar 7 layers have been constructed in accordance with civil engineering specifications to form a flat roof structure; Open 2 duct openings in the concrete roof: The side length of the rectangular opening is 80-100mm larger than the side length of the outer protective layer 15 of the duct, and the diameter of the circular opening is enlarged according to the same rule. The edges of the openings must be flat and free of cracks.

[0054] 2. Edge turning and embedded part reservation: 6. Ensure that the edge turning of the roof opening is 300mm higher than the finished building surface and 100-150mm wide, and that the concrete strength of the edge turning meets the standard. Pre-installed embedded parts: Around the center line 906 of the opening flange 6 of the roof opening, embed 100mm×100mm stainless steel plate embedded parts 907 (4 in total) at 1 / 4 of each side. The top surface of the embedded parts is flush with the top surface of the flange and is firmly fixed to prevent displacement.

[0055] III. On-site Installation Phase

[0056] 1. Fixing the duct support 8: Install the duct support 8 (stainless steel angle steel or channel steel) above the roof opening flange 6 according to the design position. Weld the bottom of the support to the stainless steel block embedded parts reserved at the four corners of the flange to ensure that the verticality deviation of the support is ≤3‰ and the load-bearing capacity meets the weight requirements of the duct and rainproof device.

[0057] 2. Installation of indoor and outdoor connecting duct 10: Pass the prefabricated indoor and outdoor connecting duct 10 through the duct opening 2 in the concrete roof, adjust the verticality of the duct, and align the center of the duct with the center of the opening; complete the fixing of the duct and the bracket: Before installing the duct rainproof component 1, fix the indoor and outdoor connecting duct 10 to the duct bracket 8 by riveting or welding. The welding points need to be treated with anti-corrosion (this step can be omitted for stainless steel materials, and zinc plating is required for galvanized materials).

[0058] 3. Support and fixation of rain cover 9: Install intermediate support column 904: Fully weld the lower end of intermediate support column 904 to the stainless steel plate embedded part 907 on the center line of the roof opening flange 6, and weld the upper end to the inner side of the rain cover skirt 902 to ensure that the support column is vertical and does not wobble. After welding, check the levelness of rain cover 9, and control the deviation within 2mm / m.

[0059] 4. Indoor and outdoor duct connection: The lower end of the indoor duct 11 is connected to the indoor and outdoor connecting duct 10 through the duct flange 17. If the indoor duct 11 is made of galvanized steel plate, an insulating gasket is placed between the galvanized angle steel flange 16 and the stainless steel flange, and then bolts are tightened to avoid electrochemical corrosion. The upper end of the outdoor duct 12 is connected to the indoor and outdoor connecting duct 10 through the duct flange 17. Similarly, it is installed according to the material compatibility requirements to ensure that the flange connection is sealed (a sealing strip can be added) and there are no air leakage gaps.

[0060] IV. Sealing and Protection Stage

[0061] 1. Sealing the gaps in the opening: After the duct is fixed, use non-combustible materials (such as fireproof rock wool and fireproof sealant) to fill the gaps between the duct opening 2 and the outer protective layer 15 of the duct in the concrete roof. The filling should be dense and without voids. The surface should be smoothed with cement mortar 7 to form the first sealing barrier and prevent rainwater from seeping in through the gaps in the opening.

[0062] 2. Rainproof performance inspection: Manual water spray test: Spray water on the rain cover 9 and the area of ​​the roof opening flange 6, and observe whether there is water seepage at the base of the indoor air duct 11 and around the roof opening; if leakage is found, the weld 905 of the rain cover 9 needs to be repaired or the gap of the opening needs to be resealed until there is no leakage.

[0063] V. Thermal Insulation and External Protection Construction Stage

[0064] 1. Preliminary insulation construction: After the duct rainproof component 1 is installed, first construct the duct insulation layer below the rainproof cover 9: If it is a heat-insulated duct, attach the insulation material, such as rock wool, to the outside of the duct wall 13; if it is a cold-insulated duct, such as thick foam rubber and plastic cotton, first attach the cold insulation layer, and then add a moisture-proof layer, such as polyethylene film, on the outside to ensure that the insulation material is tightly attached without gaps.

[0065] 2. Installation of outer protective layer 15: Select 0.3-0.5mm thick galvanized iron sheet or 0.6mm / 0.8mm thick aluminum (aluminum alloy) plate as outer protective layer 15, wrap it around the outside of the insulation layer. The joints of outer protective layer 15 are lapped or riveted, with an overlap width of ≥50mm to prevent rainwater from seeping into the insulation layer.

[0066] 3. Subsequent insulation construction: Complete the construction of the insulation layer and outer protective layer 15 of the outdoor duct 12 above the indoor duct 11 and the rain cover 9. The construction standards are consistent with the previous ones to ensure the insulation continuity of the entire duct system. At the same time, avoid covering the vertical edge 903 of the rain cover with insulation material so as not to affect the rainproof function.

[0067] VI. Acceptance Phase

[0068] After assembly, acceptance shall be carried out in accordance with the standard GB50243-2016: check the sealing of the duct connection, the firmness of the rainproof device installation, the thickness of the insulation layer and the integrity of the outer protective layer 15. Only after confirming that there is no leakage and no structural deformation can it be put into use.

[0069] The working principle of this utility model is as follows: the edge 901 of the rain cover is fully welded to the indoor and outdoor connecting duct 10 to form an annular sealing strip, blocking the path of rainwater seeping in along the outer wall of the duct; the skirt 902 of the rain cover extends outward at an angle of 45°-75°, using gravity to guide rainwater to flow quickly to the outside, preventing rainwater from accumulating at the top of the cover and seeping in; the vertical edge 903 of the rain cover extends downward by 200mm and covers the roof opening flange 6, maintaining a 100mm gap with the flange sidewall, which not only blocks vertically falling rainwater from directly entering the opening, but also guides splashed rainwater to drain along the flange through the gap, forming a physical isolation barrier. The indoor and outdoor connecting duct 10 is made of stainless steel plate with a thickness of ≥2mm and a length of ≥1250mm, exceeding the sum of the height of the roof opening flange 6 and the rain cover 9, to ensure that the part of the duct passing through the roof has sufficient rigidity to resist wind pressure; the duct support 8 is fixed to the roof opening flange 6, and the duct and support are riveted or welded in advance before installation to form a rigid connection; the two ends of the intermediate support column 904 are welded to the roof pre-reserved embedded parts and the rain cover skirt 902 respectively, to transfer the wind and rain load borne by the rain cover 9 to the roof structure and avoid the rain cover from deforming and failing to prevent rain.

[0070] The size of the concrete roof opening is 80-100mm larger than the outer protective layer 15 of the duct. The reserved installation space facilitates the sealing of gaps. After filling with non-combustible materials, a sealing layer is formed to prevent rainwater from seeping through the gap between the duct and the opening. The roof opening flange 6 is 300mm higher than the finished building surface and 100-150mm wider, forming a ring-shaped water barrier around the opening. Even if a small amount of rainwater crosses the vertical edge 903 of the rain cover, it will be blocked by the flange and discharged along the roof drainage system.

[0071] Stainless steel ducts and rain covers 9 are rust-resistant and adaptable to humid roof environments. When galvanized steel ducts are connected to stainless steel flanges, insulating gaskets are used to isolate dissimilar metals, preventing connection failures caused by electrochemical corrosion. In heat preservation / cold preservation conditions, the duct insulation material 14 is attached to the duct wall 13, and the outer protective layer 15 wraps around the outside, which reduces energy loss and prevents moisture in the air from condensing on the duct surface and seeping into the roof, achieving the dual effects of rain protection and energy saving.

[0072] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A rainproof device for ventilation ducts on concrete roofs, characterized in that, Includes duct rainproof components (1), indoor duct (11), outdoor duct (12), duct support (8), concrete roof duct opening (2), roof floor slab (3), roof insulation layer (4), roof waterproof layer (5), roof opening flange (6), and cement mortar (7). The duct rainproof assembly (1) includes an indoor and outdoor connecting duct (10) and a rainproof cover (9) at the roof opening. The indoor duct (11) and the outdoor duct (12) are respectively connected to the indoor and outdoor connecting duct (10) through corresponding duct flanges (17). The duct rainproof assembly (1) is fixed to the roof opening flange (6) through the duct bracket (8). Before the duct rainproof assembly (1) is installed, the indoor and outdoor connecting duct (10) and the duct bracket (8) are riveted or welded together. The rain cover (9) and the indoor and outdoor connecting air duct (10) enclose a rainproof space. The roof floor (3), the roof insulation layer (4), the roof waterproof layer (5) and the cement mortar (7) form the roof building structure. The concrete roof air duct opening (2) is formed between the air duct rainproof component (1) and the cement mortar (7).

2. The rainproof device for a concrete roof duct as described in claim 1, characterized in that, The indoor and outdoor connecting air duct (10) and the rain cover (9) of the air duct rainproof assembly (1) are both made of stainless steel plate. The wall thickness of the indoor and outdoor connecting air duct (10) is not less than 2mm. The length of the indoor and outdoor connecting air duct (10) is greater than the sum of the height of the roof opening flange (6) and the height of the rain cover (9). The length of the indoor and outdoor connecting air duct (10) is not less than 1250mm.

3. A rainproof device for a concrete roof duct as described in claim 2, characterized in that, The rain cover (9) includes a rain cover edge (901), a rain cover skirt (902), and a rain cover vertical edge (903). The thickness of the rain cover (9) is the same as the thickness of the indoor and outdoor connecting air duct (10). The rain cover edge (901) is welded to the indoor and outdoor connecting air duct (10), and the upper and lower circumferences of the weld (905) between the rain cover edge (901) and the indoor and outdoor connecting air duct (10) are fully welded.

4. A rainproof device for a concrete roof duct as described in claim 3, characterized in that, The height of the edge (901) of the rain cover is 200mm; the angle α between the skirt (902) of the rain cover and the vertical axial center line of the indoor and outdoor connecting air duct (10) is 45°-75°. The height of the rain cover vertical edge (903) is 200mm, the gap between the rain cover vertical edge (903) and the side wall of the roof opening flange (6) is 100mm, and the rain cover vertical edge (903) covers the flange of the concrete roof duct opening (2).

5. A rainproof device for a concrete roof duct according to claim 4, characterized in that, The rain cover (9) also includes a central support column (904), and 100mm×100mm stainless steel plate embedded parts (907) are reserved around the center line (906) of the roof opening flange (6) and at 1 / 4 of each side. The lower end of the intermediate support column (904) is welded to the stainless steel plate embedded part (907) on the roof opening flange (6), and the upper end of the intermediate support column (904) is welded to the rainproof cover skirt (902).

6. A rainproof device for a concrete roof duct according to claim 5, characterized in that, The intermediate support column (904) is made of stainless steel round bar or steel pipe with a diameter of 10mm.

7. A rainproof device for a concrete roof duct according to claim 1, characterized in that, The indoor duct (11) and the outdoor duct (12) are both rectangular or circular ducts; the indoor duct (11) and the outdoor duct (12) are both made of galvanized steel or stainless steel; the indoor duct (11) and the outdoor duct (12) are both insulated, cold-insulated or uninsulated ducts.

8. A rainproof device for a concrete roof duct according to claim 7, characterized in that, When the indoor air duct (11) or the outdoor air duct (12) is made of galvanized steel sheet, the connection between the galvanized angle steel flange (16) of the galvanized steel sheet and the air duct flange (17) is isolated by an insulating gasket. It also includes duct insulation material (14) and outer protective layer (15). Under the heat preservation state, the duct insulation material (14) is attached to the outer surface of the duct wall (13) of the indoor duct (11), the outdoor duct (12), and the indoor and outdoor connecting duct (10). In the cold-keeping state, the duct insulation material (14) is attached to the outer surface of the duct wall (13), and the outer protective layer (15) is wrapped around the outside of the duct insulation material (14).

9. A rainproof device for a concrete roof duct according to claim 8, characterized in that, The outer protective layer (15) is made of galvanized iron sheet with a thickness of 0.3-0.5mm, or aluminum or aluminum alloy plate with a thickness of 0.6mm, or aluminum or aluminum alloy plate with a thickness of 0.8mm.

10. A rainproof device for a concrete roof duct according to claim 9, characterized in that, In the concrete roof duct opening (2), the side length of the rectangular opening is 80-100mm larger than the side of the outer protective layer (15), and the diameter of the circular opening is 80-100mm larger than the diameter of the outer protective layer (15). The gaps in the concrete roof duct opening (2) are sealed with non-combustible materials. The roof opening flange (6) is 300mm higher than the finished building surface, and the width of the roof opening flange (6) is 100-150mm.

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