A self-waterproofing structure of a group building basement and a construction method thereof
By combining a recessed design, an isolation waterproof layer, and a permeable support layer at the entrance of the basement of the complex building, the problem of rainwater overflow and accumulation at the basement entrance was solved, achieving a self-waterproofing effect for the basement. Furthermore, rainwater was collected in a storage tank for landscaping, improving waterproofing performance and rainwater utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ANHUI HIGHWAY BRIDGE ENG CO LTD
- Filing Date
- 2022-09-08
- Publication Date
- 2026-06-02
AI Technical Summary
During heavy rain, rainwater overflows from the drainage system at the basement entrance of the complex, causing water to accumulate at the basement entrance and flow into the basement. The existing waterproofing structure cannot effectively solve this problem.
A self-waterproofing structure for the basement of a group building is adopted, which includes a combination design of basement floor, drainage ditch components, grooves, isolation waterproof layer, permeable support layer and water storage tank. The grooves collect overflowing rainwater and guide it into the water storage tank to prevent rainwater from flowing erratically.
It effectively prevents rainwater accumulation at the basement entrance, ensures the basement interior remains dry, and allows rainwater in the storage tank to be used for greening irrigation, thus improving the basement's waterproofing performance and rainwater utilization efficiency.
Smart Images
Figure CN116290325B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building engineering technology, and in particular to a self-waterproofing structure for the basement of a multi-unit building and its construction method. Background Technology
[0002] The general principle of basement waterproofing in my country is "combining prevention, drainage, interception, and blocking; integrating rigid and flexible methods; adapting to local conditions; and comprehensive management." Over the years, my country has made significant progress in both rigid and flexible waterproofing. In terms of rigid waterproofing, my country has made remarkable progress, mainly in improving the impermeability of concrete; in terms of flexible waterproofing, various waterproofing materials have also developed rapidly.
[0003] In most buildings, the basements are underground parking garages. To facilitate vehicle access, the ground at the basement entrance is usually sloping. During heavy rain, rainwater flows from the outside into the basement along the sloping ground at the entrance. The waterproofing and drainage system of the basement includes a drainage ditch assembly at the lower end of the sloping entrance to collect and drain rainwater from the entrance and other areas. However, if the rainfall is too heavy and exceeds the maximum drainage capacity of the drainage ditch assembly, it will overflow, causing water accumulation at the basement entrance and water from the entrance to flow into the basement and cause water accumulation in other areas. Summary of the Invention
[0004] The purpose of this invention is to solve the problem of rainwater accumulation at the end of the slope at the entrance of a basement, and to propose a self-waterproofing structure for the basement of a group building and its construction method.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A self-waterproofing structure for the basement of a multi-story building includes a basement floor and a drainage ditch assembly disposed at the end of the slope of the basement floor. The basement floor includes an upper support layer, a middle waterproof layer, and a lower support layer. The drainage ditch assembly is disposed in the upper support layer. The top of the upper support layer has a groove on the side of the upper support layer near the drainage ditch assembly away from the slope of the basement floor. The bottom of the inner side of the groove has an insulating waterproof layer. The inner side of the groove, above the insulating waterproof layer, has a permeable support layer. The bottom of the lower support layer has a water storage tank communicating with the bottom of the groove.
[0007] As a further description of the above technical solution:
[0008] The drainage ditch assembly includes a drainage culvert with an opening at the top, and a leak-proof cover is installed on the top of the drainage culvert. The upper support layer includes a surface layer and a reinforced concrete structural layer distributed from top to bottom.
[0009] As a further description of the above technical solution:
[0010] The groove extends through the surface layer to the inner side of the reinforced concrete structure layer. Both sides of the groove are inclined. The isolation waterproof layer includes a second waterproof membrane layer evenly spread in the groove. A second rigid waterproof layer is spread on top of the second waterproof membrane layer. The inner top of the second rigid waterproof layer has an installation groove with a concave cross-section. A concave and inclined metal water guide plate is installed on the inner side of the installation groove. The inclined end of the metal water guide plate is connected to the water storage tank.
[0011] As a further description of the above technical solution:
[0012] The permeable support layer includes a plurality of permeable precast concrete blocks spaced apart, with a plurality of isolation strips between the permeable precast concrete blocks. The bottom of the plurality of permeable precast concrete blocks is attached to the second rigid waterproof layer, and there is a gap between the bottom of the plurality of permeable precast concrete blocks and the top recess of the metal water guide plate.
[0013] As a further description of the above technical solution:
[0014] The middle waterproof layer includes a mortar protective layer, a first waterproof membrane layer, and a first rigid waterproof layer, which are sequentially distributed below the reinforced concrete structural layer. The lower support layer includes a cushion layer disposed below the first rigid waterproof layer. Below the cushion layer is a plain soil layer. The water storage tank is disposed inside the plain soil layer. The second rigid waterproof layer has a water receiving groove with an open top at the lowest inclined end near the metal water guide plate. The bottom of the water receiving groove is connected to the water storage tank through a drain pipe.
[0015] As a further description of the above technical solution:
[0016] A construction method for a self-waterproofing structure in the basement of a multi-story building complex includes the following steps:
[0017] S1. After excavating the subgrade, the water storage tank is pre-buried in the excavation trench of the subgrade. A vertical drain pipe is installed on the top of the water storage tank. The subgrade is backfilled into the inside of the excavation trench. The subgrade is then leveled and compacted along the designed slope of the basement floor.
[0018] S2. After spreading the subgrade and the first rigid waterproof layer from bottom to top onto the plain soil layer, level and compact them. Seal the connection between the first rigid waterproof layer and the drain pipe with waterproof sealant.
[0019] S3. Lay the first waterproof membrane layer on top of the first rigid waterproof layer. The overlap length of adjacent first waterproof membrane layers is 80-100mm. Seal the connection between the first waterproof membrane layer and the drain pipe with waterproof sealant.
[0020] S4. Spread the mortar protective layer on the first waterproof membrane layer and smooth it out;
[0021] S5. Fix the reinforcing cage above the mortar protective layer, and reserve the groove and drainage pipe culvert cavity on the reinforcing cage. Fix the mold that matches the outside of the groove and drainage pipe culvert on the reinforcing cage. At this time, spread the concrete above the mortar protective layer to complete the reservation of the groove and drainage pipe culvert installation cavity and the spreading of the reinforced concrete structure layer.
[0022] S6. After removing the molds for the groove and drainage pipe culvert, install the drainage pipe culvert in the cavity reserved in the reinforced concrete structure layer, and cover the top of the drainage pipe culvert with the leak cover plate.
[0023] S7. For the prefabrication of permeable concrete precast blocks, the second waterproof membrane layer is then laid inside the groove, and the connection between the second waterproof membrane layer and the drain pipe is sealed with waterproof sealant.
[0024] S8. Install a reserved mold above the second waterproof membrane layer. The reserved mold is tilted towards the drain pipe. Cut the drain pipe and fix the water receiving groove on the top of the drain pipe so that the water receiving groove is located below the lowest end of the reserved mold. Seal the top of the water receiving groove with a cloth plug. Lay the second rigid waterproof layer above the second waterproof membrane layer. After the second rigid waterproof layer is formed, remove the reserved mold so that the top of the second rigid waterproof layer has an installation groove.
[0025] S9. Fix the metal water guide plate inside the installation groove, then remove the cloth plug at the top of the water receiving groove, and move the permeable concrete precast block above the second rigid waterproof layer.
[0026] S10. Lay the surface layer on top of the reinforced concrete structural layer, so that the surface layer is flush with the top of the junction between the surface layer and the drain cover and the permeable concrete precast block.
[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:
[0028] The basement floor consists of an upper support layer, a middle waterproof layer, and a lower support layer. The middle waterproof layer prevents water from seeping upwards from the bottom of the basement. During heavy rain, external rainwater flows along the slope of the basement floor and other rainwater to the inside of the drainage ditch assembly. Excess rainwater overflowing from the drainage ditch assembly is collected by a groove set on the side of the drainage ditch assembly away from the slope of the basement floor. The overflowing rainwater flows towards the permeable support layer and then seeps downwards through the permeable support layer to the groove below. Because there is an insulating waterproof layer inside the groove, the rainwater can only be collected in a water storage tank connected to the groove. This prevents rainwater from flowing turbulently and causing water accumulation on the basement floor, thus solving the problem of rainwater accumulation at the end of the slope at the basement entrance. Attached Figure Description
[0029] Figure 1 A cross-sectional structural schematic diagram according to the present invention is shown;
[0030] Figure 2 It shows Figure 1 A magnified schematic diagram of the structure at point B;
[0031] Figure 3 It shows Figure 1 Schematic diagram of the cross-sectional structure at point AA;
[0032] Figure 4 It shows Figure 3 A magnified schematic diagram of the structure at point C;
[0033] Figure 5 A top view structural diagram of a permeable precast concrete block provided according to an embodiment of the present invention is shown;
[0034] Legend:
[0035] 1. Surface layer; 2. Reinforced concrete structural layer; 3. Mortar protective layer; 4. First waterproof membrane layer; 5. First rigid waterproof layer; 6. Subbase layer; 7. Plain soil layer; 8. Drainage pipe culvert; 9. Leakage cover plate; 10. Permeable concrete precast block; 1001. Isolation strip; 11. Metal water guide plate; 12. Second rigid waterproof layer; 1201. Installation groove; 13. Second waterproof membrane layer; 14. Water storage tank; 15. Drain pipe; 16. Water receiving trough. Detailed Implementation
[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0037] Please see Figure 1-5 The present invention provides a technical solution: a self-waterproofing structure for the basement of a group building, including a basement floor and a drainage ditch assembly set at the end of the slope of the basement floor. The basement floor includes an upper support layer, a middle waterproof layer and a lower support layer. The drainage ditch assembly is set in the upper support layer. The top of the upper support layer has a groove on the side of the upper support layer near the drainage ditch assembly away from the slope of the basement floor. The bottom of the inner side of the groove has an isolation waterproof layer. The inner side of the groove above the isolation waterproof layer has a permeable support layer. The bottom of the lower support layer has a water storage tank 14 communicating with the bottom of the groove.
[0038] The basement floor consists of an upper support layer, a middle waterproof layer, and a lower support layer. The middle waterproof layer prevents water from seeping upwards from the bottom of the basement. During heavy rain, external rainwater flows along the slope of the basement floor and other rainwater flows to the inside of the drainage ditch assembly. Excess rainwater overflowing from the drainage ditch assembly is collected by setting a groove on the side of the drainage ditch assembly away from the slope of the basement floor. The overflowing rainwater flows towards the permeable support layer and seeps downwards through the permeable support layer to the groove below. Because there is an insulating waterproof layer inside the groove, the rainwater can only be collected in the water storage tank 14 connected to the groove, thereby preventing rainwater turbulence and water accumulation on the basement floor. Furthermore, the rainwater collected in the water storage tank 14 can be connected to an external water pump for irrigation of the green vegetation in the building complex.
[0039] Specifically, such as Figure 1 As shown, the drainage ditch assembly includes a drainage culvert 8 with an opening at the top, and a drain cover 9 is installed on the top of the drainage culvert 8. The upper support layer includes a surface layer 1 and a reinforced concrete structural layer 2 distributed from top to bottom.
[0040] The top opening of the drainage culvert 8 allows rainwater from the sloping basement floor to flow into the drainage culvert 8 for collection and discharge. The leak-proof cover 9 covering the opening of the drainage culvert 8 is used to support vehicles and pedestrians crossing the drainage culvert 8. The upper support layer includes a surface layer 1 and a reinforced concrete structural layer 2, which ensures the upper support strength of the basement floor and reduces the deformation of the upper support layer that could lead to deformation of the middle waterproof layer and affect the waterproof performance of the basement bottom.
[0041] Specifically, such as Figure 2 and Figure 4 As shown, the groove extends through the surface layer 1 to the inner side of the reinforced concrete structural layer 2. Both sides of the groove are inclined. The isolation waterproof layer includes a second waterproof membrane layer 13 evenly spread in the groove. A second rigid waterproof layer 12 is spread on top of the second waterproof membrane layer 13. The inner top of the second rigid waterproof layer 12 has an installation groove 1201 with a concave cross-section. A concave and inclined metal water guide plate 11 is installed on the inner side of the installation groove 1201. The inclined end of the metal water guide plate 11 is connected to the water storage tank 14.
[0042] The isolation waterproof layer includes a second waterproof membrane layer 13 evenly spread in the groove. A second rigid waterproof layer 12 is spread on top of the second waterproof membrane layer 13, which can ensure good waterproofing between the groove and the outside. The rigid structure of the second rigid waterproof layer 12 can provide stable support for the permeable support, preventing the permeable support layer from flattening the metal water guide plate 11. Furthermore, the two sides of the groove are inclined to facilitate the flow of rainwater to the inside of the metal water guide plate 11. Through the connection between the end of the metal water guide plate 11 and the water storage tank 14, it is easy to quickly transport rainwater to the inside of the water storage tank 14.
[0043] Specifically, such as Figure 1 and Figure 5 As shown, the permeable support layer includes a plurality of permeable precast concrete blocks 10 spaced apart, and there are a plurality of isolation strips 1001 between the permeable precast concrete blocks 10. The bottom of the plurality of permeable precast concrete blocks 10 is attached to the second rigid waterproof layer 12, and there is a gap between the bottom of the plurality of permeable precast concrete blocks 10 and the top recess of the metal water guide plate 11.
[0044] The permeable support layer is a permeable concrete precast block 10, which has high construction efficiency and facilitates stable installation of the permeable support layer inside the groove. Compared with traditional on-site paving construction, it is easier to ensure that there is a gap between the bottom of the permeable concrete precast block 10 and the top concave part of the metal water guide plate 11, so that rainwater can be stably transported through the concave part of the metal water guide plate 11. In addition, the gap between the permeable concrete precast blocks 10 further facilitates the rapid downward infiltration of rainwater. The setting of the isolation strip 1001 prevents the permeable concrete precast block 10 from shaking and ensures the stable installation of the permeable concrete precast block 10.
[0045] Specifically, such as Figure 3 and Figure 4 As shown, the middle waterproof layer includes a mortar protective layer 3, a first waterproof membrane layer 4, and a first rigid waterproof layer 5, which are sequentially distributed below the reinforced concrete structural layer 2. The lower support layer includes a cushion layer 6 set below the first rigid waterproof layer 5. Below the cushion layer 6 is a plain soil layer 7. The water storage tank 14 is set inside the plain soil layer 7. The interior of the second rigid waterproof layer 12 has a water receiving trough 16 with an open top at the lowest inclined end near the metal water guide plate 11. The bottom of the water receiving trough 16 is connected to the water storage tank 14 through a drain pipe 15.
[0046] The water storage tank 14 is located inside the soil layer 7, which does not affect the overall strength of the basement floor. The soil layer 7 is isolated from the first rigid waterproof layer 5 and the first waterproof membrane layer 4 by the subbase layer 6. The first rigid waterproof layer 5 and the first waterproof membrane layer 4 ensure good waterproofing of the bottom of the basement. The mortar protective layer 3 protects the first waterproof membrane layer 4. The rainwater in the metal water guide plate 11 flows to the inside of the water receiving trough 16 under the action of gravity, and flows to the inside of the water pipe 15 and the water storage tank 14 through the water receiving trough 16.
[0047] Specifically, such as Figure 1-5 As shown, a construction method for a self-waterproofing structure in the basement of a multi-story building includes the following steps:
[0048] S1. After excavating the soil layer 7, the water storage tank 14 is pre-buried in the excavation trench of the soil layer 7. A vertical drain pipe 15 is installed on the top of the water storage tank 14. The soil is backfilled into the inside of the excavation trench. Then the soil layer 7 is leveled and compacted along the designed slope of the basement floor.
[0049] S2. After spreading the subgrade 6 and the first rigid waterproof layer 5 from bottom to top onto the plain soil layer 7, level and compact them. Seal the connection between the first rigid waterproof layer 5 and the drain pipe 15 with waterproof sealant.
[0050] S3. Lay the first waterproof membrane layer 4 on top of the first rigid waterproof layer 5. The overlap length of adjacent first waterproof membrane layers 4 is 80-100mm. Seal the connection between the first waterproof membrane layer 4 and the drain pipe 15 with waterproof sealant.
[0051] S4. Spread the mortar protective layer 3 on the first waterproof membrane layer 4 and smooth it out.
[0052] S5. Fix the reinforcing cage above the mortar protective layer 3, and reserve the groove and the cavity of the drainage pipe culvert 8 on the reinforcing cage. Fix the mold that matches the outside of the groove and the drainage pipe culvert 8 on the reinforcing cage. At this time, spread the concrete above the mortar protective layer 3 to complete the reservation of the groove and the cavity of the drainage pipe culvert 8 and the spreading of the concrete reinforced concrete structure layer 2.
[0053] S6. After removing the molds of the groove and the drainage pipe culvert 8, install the drainage pipe culvert 8 in the cavity reserved in the reinforced concrete structure layer 2, and cover the top of the drainage pipe culvert 8 with the leak cover plate 9.
[0054] S7. Precast the permeable concrete precast block 10, then spread the second waterproof membrane layer 13 to the inside of the groove, and seal the connection between the second waterproof membrane layer 13 and the drain pipe 15 with waterproof sealant.
[0055] S8. Install a reserved mold above the second waterproof membrane layer 13. The reserved mold is tilted towards the drain pipe 15. Cut the drain pipe 15 and fix the water receiving groove 16 on the top of the drain pipe 15 so that the water receiving groove 16 is located below the lowest end of the reserved mold. Seal the top of the water receiving groove 16 with a cloth plug. Spread the second rigid waterproof layer 12 on the second waterproof membrane layer 13. After the second rigid waterproof layer 12 is formed, remove the reserved mold so that the top of the second rigid waterproof layer 12 has an installation groove 1201.
[0056] S9. Fix the metal water guide plate 11 inside the installation groove 1201, then remove the cloth plug at the top of the water receiving groove 16, and move the permeable concrete precast block 10 above the second rigid waterproof layer 12.
[0057] S10. Lay the surface layer 1 on top of the reinforced concrete structural layer 2, so that the top of the surface layer 1 is flush with the top of the junction of the drain cover 9 and the permeable concrete precast block 10.
[0058] During construction, the prefabricated structure of the permeable concrete precast block 10 not only improves construction efficiency but also facilitates later maintenance and replacement. The permeable concrete precast block 10 is moved to the inside of the groove, so that there is a gap between the bottom of the permeable concrete precast block 10 and the top recess of the metal water guide plate 11, and water is guided and transported through the top recess of the metal water guide plate 11.
[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A construction method for a self-waterproofing structure in the basement of a multi-story building, characterized in that, It includes the following steps: S1. After excavating the soil layer (7), the water storage tank (14) is pre-buried in the excavation trench of the soil layer (7), a vertical drain pipe (15) is installed on the top of the water storage tank (14), the soil is backfilled into the inside of the excavation trench, and the soil layer (7) is leveled and compacted along the designed slope of the basement floor. S2. Spread the subbase (6) and the first rigid waterproof layer (5) from bottom to top onto the soil layer (7), then level and compact them. Seal the connection between the first rigid waterproof layer (5) and the drain pipe (15) with waterproof sealant. S3. Lay the first waterproof membrane layer (4) on top of the first rigid waterproof layer (5). The overlap length of adjacent first waterproof membrane layers (4) is 80-100mm. The connection between the first waterproof membrane layer (4) and the drain pipe (15) is sealed with waterproof sealant. S4. Spread the mortar protective layer (3) on the first waterproof membrane layer (4) and smooth it out; S5. Fix the steel cage above the mortar protective layer (3), and reserve the groove and drainage pipe culvert (8) on the steel cage. Fix the mold that matches the outside of the groove and drainage pipe culvert (8) on the steel cage. At this time, spread the concrete above the mortar protective layer (3) to complete the reservation of the groove and drainage pipe culvert (8) installation chamber and the spreading of the concrete reinforced concrete structure layer (2). S6. After removing the molds of the groove and the drainage pipe culvert (8), install the drainage pipe culvert (8) in the cavity reserved in the reinforced concrete structure layer (2) and cover the top of the drainage pipe culvert (8) with the leak cover plate (9). S7. Precast permeable concrete precast blocks (10), then spread the second waterproof membrane layer (13) to the inside of the groove, and seal the connection between the second waterproof membrane layer (13) and the drain pipe (15) with waterproof sealant. S8. Install a reserved mold above the second waterproof membrane layer (13). The reserved mold is tilted towards the drain pipe (15). Cut the drain pipe (15) and fix the water receiving groove (16) on the top of the drain pipe (15) so that the water receiving groove (16) is located below the lowest end of the reserved mold. Seal the top of the water receiving groove (16) with a cloth plug. Spread the second rigid waterproof layer (12) above the second waterproof membrane layer (13). After the second rigid waterproof layer (12) is formed, remove the reserved mold so that the top of the second rigid waterproof layer (12) has an installation groove (1201). S9. Fix the metal water guide plate (11) inside the installation groove (1201), then remove the cloth plug at the top of the water receiving groove (16), and move the permeable concrete precast block (10) above the second rigid waterproof layer (12). S10. Spread the surface layer (1) on top of the reinforced concrete structural layer (2) so that the top of the surface layer (1) is flush with the top of the leak cover plate (9) and the permeable concrete precast block (10).
2. A self-waterproofing structure for a basement of a group building, employing the construction method of the self-waterproofing structure for a basement of a group building as described in claim 1, comprising a basement floor and a drainage ditch assembly disposed at the end of the slope of the basement floor, characterized in that, The basement floor includes an upper support layer, a middle waterproof layer and a lower support layer. The drainage ditch assembly is installed in the upper support layer. The top of the upper support layer has a groove on the side of the drainage ditch assembly away from the slope of the basement floor. The bottom of the inner side of the groove has an isolation waterproof layer. The inner side of the groove, above the isolation waterproof layer, has a permeable support layer. The bottom of the lower support layer has a water storage tank (14) that communicates with the bottom of the groove.
3. The self-waterproofing structure for basements of a group building according to claim 2, characterized in that, The drainage ditch assembly includes a drainage culvert (8) with an opening at the top, and a leak-proof cover plate (9) is installed on the top of the drainage culvert (8). The upper support layer includes a surface layer (1) and a reinforced concrete structural layer (2) distributed from top to bottom.
4. The self-waterproofing structure for basements of group buildings according to claim 3, characterized in that, The groove extends through the surface layer (1) to the inner side of the reinforced concrete structure layer (2). Both sides of the groove are inclined. The isolation waterproof layer includes a second waterproof membrane layer (13) evenly spread in the groove. A second rigid waterproof layer (12) is spread on top of the second waterproof membrane layer (13). The top of the inner side of the second rigid waterproof layer (12) has an installation groove (1201) with a concave cross-section. A concave and inclined metal water guide plate (11) is installed on the inner side of the installation groove (1201). The inclined end of the metal water guide plate (11) is connected to the water storage tank (14).
5. A self-waterproofing structure for the basement of a group building according to claim 4, characterized in that, The permeable support layer includes a plurality of permeable precast concrete blocks (10) spaced apart, and there are a plurality of isolation strips (1001) between the permeable precast concrete blocks (10). The bottom of the plurality of permeable precast concrete blocks (10) is attached to the second rigid waterproof layer (12), and there is a gap between the bottom of the plurality of permeable precast concrete blocks (10) and the top recess of the metal water guide plate (11).
6. The self-waterproofing structure for basements of a group building according to claim 5, characterized in that, The middle waterproof layer includes a mortar protective layer (3), a first waterproof membrane layer (4) and a first rigid waterproof layer (5) distributed sequentially below the reinforced concrete structural layer (2). The lower support layer includes a cushion layer (6) set below the first rigid waterproof layer (5). Below the cushion layer (6) is a plain soil layer (7). The water storage tank (14) is set inside the plain soil layer (7). The interior of the second rigid waterproof layer (12) has a water receiving groove (16) with a top opening at the lowest inclined end near the metal water guide plate (11). The bottom of the water receiving groove (16) is connected to the water storage tank (14) through a drain pipe (15).