A structural modification of existing building roofs

Abstract

This application relates to the field of building roof renovation technology, and discloses a renovation structure for existing building roofs, comprising a support frame, a waterproof layer, and a thermal insulation layer. The support frame is modularly designed, including support beams and spliced ​​crossbeams connected to the side walls of the support beams. Several support beams and spliced ​​crossbeams are assembled to form a safety enclosure around the top of the old roof slab. Adjustable feet are provided at the bottom of the support beams to connect to the old roof slab. Each adjustable foot includes a base and a support rod, with an angle adjustment component between the base and the support rod. The support rod is telescopic. The waterproof layer is laid on the old roof slab within the safety enclosure, and the thermal insulation layer is laid on top of the waterproof layer. This application improves the efficiency of roof renovation construction.

Description

Technical Field

[0001] This application relates to the field of building roof renovation technology, and in particular to a structure for renovating the roof of an existing building. Background Technology

[0002] With the rapid development of the construction industry, a large number of existing buildings are gradually entering their aging stage, and roof systems are among the first to be affected, facing numerous challenging problems. Aging roof waterproofing layers are subjected to long-term erosion from natural factors such as ultraviolet radiation, rainwater, and temperature changes, leading to frequent aging, cracking, and blistering, ultimately causing leaks. This not only seriously affects the aesthetics and functionality of the building but also threatens structural safety. Taking old residential buildings as an example, roof leaks are commonplace during the rainy season, with top-floor residents experiencing moldy ceilings and peeling paint, significantly reducing their quality of life. Roof renovation technology, as an indispensable part of the construction industry, directly impacts the safety, durability, and aesthetics of buildings, becoming a crucial element in ensuring a safe living environment.

[0003] In practical engineering, the main methods for roof renovation currently include the following: one is to completely demolish the old roof and lay new materials; the other is to carry out surface treatment on the original basis, such as by applying waterproof coating or pasting waterproof membrane to enhance waterproof performance.

[0004] However, the aforementioned traditional methods have significant drawbacks in practical applications. Whether it's a complete renovation or surface treatment, both require the erection of safety barriers before construction. The assembly of these barriers typically involves welding them one by one, resulting in long construction cycles, low efficiency, and difficulty in meeting the demands of rapid renovation. Especially in complex terrain or old buildings, how to efficiently and economically achieve roof renovation has become a pressing technical problem to be solved. Utility Model Content

[0005] To improve the construction efficiency of roof renovation, this application provides a structure for the renovation of existing building roofs.

[0006] This application provides a technical solution for the renovation structure of an existing building roof:

[0007] A renovation structure for an existing building roof includes a support frame, a waterproof layer, and a thermal insulation layer. The support frame is modularly designed and includes support beams and spliced ​​crossbeams connected to the side walls of the support beams. Several support beams and spliced ​​crossbeams are assembled to form a safety enclosure around the top of the old roof slab. The bottom of each support beam is equipped with an adjustable foot that connects to the old roof slab. The adjustable foot includes a base and a support rod. An angle adjustment element is provided between the base and the support rod, and the support rod is telescopic. The waterproof layer is laid on the old roof slab within the safety enclosure, and the thermal insulation layer is laid on top of the waterproof layer.

[0008] By adopting the above technical solutions, this roof renovation structure can effectively adapt to the unevenness of the old roof. The modularly designed support frame forms a safety barrier, which not only improves safety during construction but also provides a stable base environment for the subsequent laying of waterproofing and thermal insulation layers. Simultaneously, the adjustable and retractable feet allow the entire structure to flexibly handle old roofs with different slopes and height differences, ensuring that the renovated roof system maintains good stability and load-bearing capacity under complex conditions, thereby significantly extending the roof's service life.

[0009] Optionally, limiting slots are provided on the two opposing side walls of the supporting beam along its own length direction. The top of the limiting slots extends to the top wall of the supporting beam. A plug-in ball head is provided on the end of the splicing crossbeam opposite to the supporting beam. The plug-in ball head is inserted into the limiting slot from the top of the supporting beam and slides with the limiting slot. When the plug-in ball head is inserted into the limiting slot, the plug-in ball head and the supporting beam are ball-jointed. A connecting through hole is provided between the splicing crossbeam and the supporting beam, and a pin is inserted in the connecting through hole.

[0010] By adopting the above technical solution, the connection between the splicing crossbeam and the supporting vertical beam achieves flexible multi-angle adjustment and a stable locking function. The cooperation between the plug-in ball head and the limiting slot not only facilitates rapid assembly but also allows the splicing crossbeam to rotate freely within a certain range, thus adapting to the installation requirements of different construction environments. In addition, the through-hole pin further enhances the stability of the connection structure, effectively preventing the splicing crossbeam from loosening or shifting during use, and improving the safety and reliability of the entire support frame.

[0011] Optionally, the support rod includes a support cylinder hinged to the base and an adjusting screw connected to the bottom of the support beam. The adjusting screw and the support cylinder are in sliding engagement, so a drive ring is rotatably provided on the top of the support cylinder. The inner ring of the drive ring has a thread that rotatably engages with the adjusting screw. The adjusting screw has a guide groove along its own axial direction. A guide key is provided on the inner ring sidewall of the drive ring along its own circumference. The guide key is located in the guide groove and is in sliding engagement with the guide groove.

[0012] By adopting the above technical solution, rotating the drive ring allows the adjusting screw to move up and down relative to the support cylinder through the cooperation of the screw on the inner ring of the drive ring and the adjusting screw. Simultaneously, the guide key on the side wall of the inner ring of the drive ring slides within the guide groove on the adjusting screw, thereby achieving precise adjustment of the support beam height. This structure flexibly adapts to the varying heights of different old roof slabs, improving the stability and reliability of the support frame and enhancing the applicability and safety of the entire roof renovation structure.

[0013] Optionally, the angle adjustment component includes a rotating shaft that slides through the support cylinder and the base, a fixed gear sleeved on one end of the rotating shaft, and a pull ring disposed on the side wall of the fixed gear. The end of the rotating shaft opposite to the fixed gear extends out of the base and is fitted with a fixed nut by a threaded rotation. The fixed nut abuts against the side wall of the base. A connecting groove is formed on the side wall of the rotating shaft along its own axial direction. A connecting strip is slidably disposed in the connecting groove and disposed on the support cylinder. A fixed tooth groove is formed on the side wall of the base opposite to the support cylinder corresponding to the fixed gear. The fixed gear and the fixed tooth groove are interlocked.

[0014] By adopting the above technical solution, when it is necessary to adjust the angle between the support cylinder and the base, the operator first loosens the fixing nut, and then uses the pull ring to pull the rotating shaft out of the base, causing the fixing gear to disengage from the fixing groove. At this time, rotating the pull ring will drive the rotating shaft to rotate, thereby changing the relative angle between the support cylinder and the base. After adjusting to the appropriate position, the fixing gear is pushed back into the fixing groove, and the fixing nut is tightened to lock the angle. This design enables precise adjustment and reliable fixation of the angle between the support rod and the base, effectively adapting to the tilt angle of different old roof panels, and significantly improving the stability and applicability of the entire renovation structure.

[0015] Optionally, an angle gauge is coaxially arranged around the fixed tooth groove on the side wall of the support cylinder, and an indicator of the mating angle gauge is arranged on the side wall of the fixed gear.

[0016] By adopting the above technical solution, the angle gauge on the side wall of the support cylinder and the indicator on the side wall of the fixed gear work together to intuitively display the tilt angle of the support frame, which facilitates the construction personnel to make precise adjustments and installations, improves the angular consistency between the support frame and the old roof slab, and thus improves the stability and safety of the overall structure.

[0017] Optionally, a rubber pad is provided on the bottom wall of the base.

[0018] By adopting the above technical solution, the rubber pads increase the friction between the base and the old roof slab, thereby improving the overall stability of the support frame and reducing the possibility of displacement under the influence of the external environment. At the same time, the rubber pads also have a certain shock absorption and cushioning effect, which can effectively reduce the pressure impact on the old roof slab during the installation of the support frame, thus extending the service life of the old roof structure.

[0019] Optionally, several rainwater inlets are installed at the lowest point of the old roof slab.

[0020] By adopting the above technical solution, the rainwater inlets installed at the lowest point of the old roof slab can effectively collect and guide rainwater out, reducing the risk of leakage caused by rainwater accumulation on the roof.

[0021] Optionally, the inner wall of the rainwater inlet is provided with an overlapping edge, and a filter screen is provided inside the rainwater inlet. The filter screen is inserted into the rainwater inlet and overlaps on the overlapping edge.

[0022] By adopting the above technical solution, the filter screen can effectively prevent impurities such as leaves and mud from entering the rainwater inlet, reducing the possibility of drainage channel blockage and thus improving the smoothness of the roof drainage system. The overlapping edge design makes the filter screen installation more stable and also facilitates disassembly and cleaning, improving maintenance convenience.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. This roof renovation structure effectively adapts to the unevenness of old roofs. The modular support frame forms a safety barrier, enhancing safety during construction and providing a stable base environment for subsequent waterproofing and insulation layers. Furthermore, the adjustable and retractable feet allow the structure to flexibly handle roofs with varying slopes and height differences, ensuring the renovated roof system maintains good stability and load-bearing capacity under complex conditions, thus significantly extending the roof's lifespan.

[0025] 2. The connection between the splicing crossbeam and the supporting vertical beam enables flexible multi-angle adjustment and a stable locking function. The combination of the plug-in ball joint and the limiting slot not only facilitates rapid assembly but also allows the splicing crossbeam to rotate freely within a certain range, thus adapting to installation requirements in different construction environments. In addition, the through-hole pins further enhance the stability of the connection structure, effectively preventing the splicing crossbeam from loosening or shifting during use, thereby improving the safety and reliability of the entire support frame.

[0026] 3. Rotating the drive ring allows the adjusting screw to move up and down relative to the support cylinder, utilizing the engagement of the screw on the inner ring of the drive ring with the adjusting screw. Simultaneously, the guide key on the side wall of the inner ring of the drive ring slides within the guide groove on the adjusting screw, thereby achieving precise adjustment of the support beam height. This structure flexibly adapts to the varying heights of different old roof slabs, improving the stability and reliability of the support frame and enhancing the applicability and safety of the entire roof renovation structure. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 2 This is a schematic diagram illustrating the connection relationship between the waterproof layer, the thermal insulation layer, and the old roof slab in the embodiments of this application.

[0029] Figure 3This is a schematic diagram illustrating the connection relationship between the supporting vertical beam and the splicing horizontal beam in the embodiments of this application.

[0030] Figure 4 This is a schematic diagram illustrating the connection relationship between the base and the support rod in an embodiment of this application.

[0031] Figure 5 This is a cross-sectional view illustrating the connection relationship between the support cylinder and the adjusting screw in the embodiments of this application.

[0032] Figure 6 This is a cross-sectional view illustrating the connection between the rainwater inlet and the filter screen in an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Support frame; 11. Support beam; 111. Limiting slot; 12. Splicing crossbeam; 121. Inserted ball joint; 2. Waterproof layer; 21. Polymer waterproof coating layer; 22. SBS modified bitumen waterproof membrane layer; 3. Thermal insulation layer; 31. Vacuum insulation board; 32. Extruded polystyrene foam board; 4. Parapet wall; 5. Adjustable feet; 51. Base; 511. Rubber pad; 512. Fixing groove; 51 3. Angle gauge; 52. Support rod; 521. Support cylinder; 5211. Connecting strip; 522. Adjusting screw; 5221. Guide groove; 6. Pin; 61. Plug; 7. Angle adjusting component; 71. Rotating shaft; 711. Connecting groove; 712. Fixing nut; 72. Fixing gear; 721. Indicator; 73. Pull ring; 8. Drive ring; 81. Guide key; 9. Rainwater inlet; 91. Overlapping edge; 92. Filter screen. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0036] This application discloses a structure for the renovation of an existing building roof.

[0037] Reference Figure 1 and Figure 2 A renovation structure for an existing building roof includes a supporting frame 1, a waterproof layer 2, a thermal insulation layer 3, and a parapet wall 4. The supporting frame 1 is modularly designed and includes supporting beams 11 and splicing beams 12. Several supporting beams 11 and splicing beams 12 are spliced ​​together to form a safety enclosure around the top of the old roof slab 01. Adjustable feet 5 connecting the supporting beams 11 to the old roof slab 01 are provided at the bottom. The waterproof layer 2 is laid on the old roof slab 01 within the safety enclosure, and the thermal insulation layer 3 is laid on the waterproof layer 2. The parapet wall 4 is cast around the perimeter of the old roof slab 01 outside the supporting frame 1.

[0038] Reference Figure 1 and Figure 2 Construction workers can quickly erect safety barriers using the modular support frame 1. The height and angle of the support frame 1 can be flexibly adjusted using the adjustable feet 5 to meet the needs of different construction scenarios. With the safety barrier ensuring safety during construction, the waterproof layer 2 and the thermal insulation layer 3 are then laid layer by layer.

[0039] Reference Figure 3 On the two opposing side walls of the supporting beam 11, there are limiting slots 111 along their own length direction. The top of the limiting slots 111 extends to the top wall of the supporting beam 11. The end of the splicing crossbeam 12 opposite to the supporting beam 11 is fixedly provided with a plug ball head 121. The plug ball head 121 is inserted into the limiting slot 111 from the top of the supporting beam 11 and slides with the limiting slot 111. When the plug ball is inserted into the limiting slot 111, the plug ball head 121 and the supporting beam 11 are connected by a ball joint. The splicing crossbeam 12 and the supporting beam 11 are connected by a connecting through hole 122. A pin 6 is inserted in the connecting through hole 122. Both ends of the pin 6 extending out of the supporting beam 11 are fitted with plugs 61.

[0040] Reference Figure 3 and Figure 4 The adjustable foot 5 includes a base 51 and a support rod 52. An angle adjustment component 7 is also provided between the base 51 and the support rod 52, which can adjust the angle according to the slope of the old roof slab 01. The support rod 52 can be extended and retracted to achieve height adjustment as needed.

[0041] Reference Figure 3 and Figure 4 A rubber pad 511 is fixedly installed on the bottom wall of the base 51, and the base 51 is installed on the old roof plate 01 by countersunk bolts.

[0042] Reference Figure 4 and Figure 5The support rod 52 includes a support cylinder 521 and an adjusting screw 522. The bottom end of the support cylinder 521 is hinged to the base 51. The angle adjusting component 7 includes a rotating shaft 71, a fixed gear 72, and a pull ring 73. The rotating shaft 71 is coaxially and slidably passed through the support cylinder 521 and the base 51. A connecting groove 711 is formed along its own axial direction on the side wall of the rotating shaft 71. A connecting strip 5211 is slidably arranged in the connecting groove 711. The connecting strip 5211 is integrally formed on the support cylinder 521. The fixed gear 72 is coaxially and fixedly sleeved on the end of the rotating shaft 71 that extends out of the base 51. The end of the rotating shaft 71 that is away from the fixed gear 72 extends out of the base 51 and is fitted with a fixing nut 712 by threaded rotation. The pull ring 73 is fixedly arranged on the side wall of the fixed gear 72 that is away from the rotating shaft 71. A fixing groove 512 is provided on the side wall of the base 51 opposite to the support cylinder 521, corresponding to the fixing gear 72. The fixing gear 72 and the fixing groove 512 are interlocked. By pulling the pull ring 73 and rotating the fixing gear 72, the angle of the support frame 1 can be adjusted. At the same time, the rotating shaft 71 is locked by the fixing nut 712 to ensure the stability after adjustment.

[0043] Reference Figure 4 In order to improve the consistency of the angle adjustment of several support beams 11 on the support frame 1, an angle gauge 513 is coaxially electroplated around the fixed tooth groove 512 on the side wall of the support cylinder 521, and an indicator 721 for aligning with the angle gauge 513 is fixedly installed on the side wall of the fixed gear 72.

[0044] Reference Figure 4 and Figure 5 The adjusting screw 522 and the support cylinder 521 are in sliding engagement. A drive ring 8 is rotatably mounted on the top of the support cylinder 521 via a bearing. The inner ring of the drive ring 8 has a thread that rotatably engages with the adjusting screw 522. The top of the adjusting screw 522 is fixedly mounted on the bottom wall of the support beam 11. The adjusting screw 522 has a guide groove 5221 along its axial direction. A guide key 81 is integrally formed on the inner ring sidewall of the drive ring 8 along its circumference. The guide key 81 is located within the guide groove 5221 and is in sliding engagement with it. By rotating the drive ring 8, the length of the support rod 52 can be easily adjusted, thereby achieving fine adjustment of the height of the support frame 1.

[0045] Reference Figure 2In this embodiment, the waterproof layer 2 includes a polymer waterproof coating layer 21 and an SBS modified bitumen waterproof membrane layer 22. The polymer waterproof coating layer 21 can be made of flexible waterproof materials such as polyurethane or acrylic waterproof coatings. It is applied to the old roof slab 01 to form a continuous, closed waterproof barrier, effectively filling tiny cracks and pores in the old roof slab 01 and enhancing its waterproof performance. The SBS modified bitumen waterproof membrane layer 22 is constructed using a hot-melt method to ensure a strong bond between the membrane and the substrate; its thickness is generally not less than 4mm. Additional layers are added to easily leak-prone areas such as the corners, gutters, and eaves of the old roof slab 01 to further improve the waterproofing effect.

[0046] Reference Figure 2 In this embodiment, the thermal insulation layer 3 includes a vacuum insulation board 31 and an extruded polystyrene foam board 32. The vacuum insulation board 31 has an extremely low thermal conductivity and can be made of high-performance materials such as ceramic fiber vacuum insulation board 31 or glass fiber vacuum insulation board 31, with a thickness generally ranging from 30mm to 50mm. The extruded polystyrene foam board 32 has good thermal insulation performance and can be made of ordinary or flame-retardant materials, with a thickness generally ranging from 20mm to 50mm. The vacuum insulation board 31 is laid on the roof base layer, and the extruded polystyrene foam board 32 is laid on the surface of the vacuum insulation board 31, forming a double-layer thermal insulation structure.

[0047] Reference Figure 6 Several rainwater inlets 9 are arranged at the lowest point of the old roof slab 01. An integrally formed overlapping edge 91 is provided around the inner wall of each rainwater inlet 9. A filter screen 92 is installed inside the rainwater funnel, inserted into the funnel and overlapping the overlapping edge 91. The filter screen 92 effectively prevents debris from entering the rainwater inlets 9, reducing the possibility of blockage in the drainage channel and thus improving the smoothness of the roof drainage system.

[0048] The implementation principle of an existing building roof renovation structure according to an embodiment of this application is as follows: First, according to the actual size and terrain conditions of the old roof, the support frame 1 is assembled. The height and angle of the support frame 1 are adjusted by adjusting feet 5. The height of the support beam 11 is adjusted by rotating the drive ring 8. The screw in the inner ring of the drive ring 8 cooperates with the adjusting screw 522, so that the adjusting screw 522 can move up and down relative to the support cylinder 521. At the same time, the guide key 81 on the inner ring side wall of the drive ring 8 slides in the guide groove 5221 on the adjusting screw 522, thereby realizing the precise adjustment of the height of the support beam 11.

[0049] When it is necessary to adjust the angle between the support cylinder 521 and the base 51, the operator first loosens the fixing nut 712, and then uses the pull ring 73 to pull the rotating shaft 71 out of the base 51, causing the fixing gear 72 to disengage from the fixing tooth groove 512. At this time, rotating the pull ring 73 will drive the rotating shaft 71 to rotate, thereby changing the relative angle between the support cylinder 521 and the base 51. After adjusting to the appropriate position, the fixing gear 72 is pushed back into the fixing tooth groove 512, and the fixing nut 712 is tightened to lock the angle, ensuring its stability and achieving precise adjustment and reliable fixation of the angle between the support rod 52 and the base 51.

[0050] After the supporting frame 1 is installed and fixed, the parapet wall 4 is poured around the perimeter of the old roof slab 01 outside the supporting frame 1. Then, within the safety enclosure, a waterproof layer 2 is laid, ensuring a tight fit between the waterproof layer 2 and the old roof slab 01 without any hollow areas. Next, a thermal insulation layer 3 is laid on top of the waterproof layer 2, ensuring a smooth and seamless installation. Finally, rainwater inlets 9 and filters 92 are installed at the lowest point of the old roof slab 01 to ensure the proper functioning of the drainage system. These steps complete the construction of the entire roof renovation structure. This ensures that the renovated roof system maintains good stability and load-bearing capacity even under complex conditions, significantly extending the roof's service life.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A structure for renovating the roof of an existing building, characterized in that... The structure includes a support frame (1), a waterproof layer (2), and a thermal insulation layer (3). The support frame (1) is modularly designed and includes a support beam (11) and a splicing beam (12) connected to the side wall of the support beam (11). Several support beams (11) and splicing beams (12) are spliced ​​together to form a safety enclosure around the top of the old roof slab (01). The bottom of the support beam (11) is provided with an adjustable foot (5) connected to the old roof slab (01). The adjustable foot (5) includes a base (51) and a support rod (52). An angle adjustment component (7) is provided between the base (51) and the support rod (52), and the support rod (52) is telescopic. The waterproof layer (2) is laid on the old roof slab (01) within the safety enclosure. The thermal insulation layer (3) is laid on the waterproof layer (2).

2. The existing building roof renovation structure according to claim 1, characterized in that... On the two opposing side walls of the supporting beam (11), there are limiting slots (111) along their own length direction. The top of the limiting slots (111) extends to the top wall of the supporting beam (11). The end of the splicing beam (12) opposite to the supporting beam (11) is provided with a plug ball head (121). The plug ball head (121) is inserted into the limiting slot (111) from the top of the supporting beam (11) and slides with the limiting slot (111). When the plug ball head (121) is inserted into the limiting slot (111), the plug ball head (121) and the supporting beam (11) are ball-jointed. The splicing beam (12) and the supporting beam (11) are connected by a connecting through hole (122), and a pin (6) passes through the connecting through hole (122).

3. The existing building roof renovation structure according to claim 1, characterized in that... The support rod (52) includes a support cylinder (521) hinged to the base (51) and an adjusting screw (522) connected to the bottom of the support beam (11). The adjusting screw (522) and the support cylinder (521) are in sliding fit. Therefore, a drive ring (8) is rotatably provided on the top of the support cylinder (521). The inner ring of the drive ring (8) is provided with a thread that is in rotatable fit with the adjusting screw (522). The adjusting screw (522) is provided with a guide groove (5221) along its own axial direction. A guide key (81) is provided on the inner ring sidewall of the drive ring (8) along its own circumference. The guide key (81) is located in the guide groove (5221) and is in sliding fit with the guide groove (5221).

4. The existing building roof renovation structure according to claim 3, characterized in that... The angle adjustment component (7) includes a rotating shaft (71) that slides through the support cylinder (521) and the base (51), a fixed gear (72) sleeved on one end of the rotating shaft (71), and a pull ring (73) provided on the side wall of the fixed gear (72). The end of the rotating shaft (71) away from the fixed gear (72) extends out of the base (51) and is fitted with a fixed nut (712) by threaded rotation. The fixed nut (712) is attached to the side wall of the base (51). The rotating shaft (71) is provided with a connecting groove (711) along its own axial direction on the side wall of the rotating shaft (711). A connecting strip (5211) is slidably provided in the connecting groove (711). The connecting strip (5211) is provided on the support cylinder (521). A fixing tooth groove (512) is provided on the side wall of the base (51) opposite to the support cylinder (521) corresponding to the fixing gear (72). The fixing gear (72) and the fixing tooth groove (512) are inserted and engaged.

5. The existing building roof renovation structure according to claim 4, characterized in that... An angle gauge (513) is coaxially arranged around the fixed tooth groove (512) on the side wall of the support cylinder (521), and an indicator (721) for the mating angle gauge (513) is arranged on the side wall of the fixed gear (72).

6. The existing building roof renovation structure according to claim 1, characterized in that... A rubber pad (511) is provided on the bottom wall of the base (51).

7. The existing building roof renovation structure according to claim 1, characterized in that... Several rainwater inlets (9) are arranged at the lowest point of the old roof slab (01).

8. The existing building roof renovation structure according to claim 7, characterized in that... The inner wall of the rainwater inlet (9) is provided with an overlapping edge (91), and a filter screen (92) is provided inside the rainwater inlet (9). The filter screen (92) is inserted into the rainwater inlet (9) and overlapped on the overlapping edge (91).

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