A rainwater drainage device for a garage roof

Abstract

The utility model relates to building drainage technical field especially, more particularly to a garage roof rainwater guide device, include: diversion well, set up diversion well on garage roof, and the vertical depth of diversion well extends to underground building gravel water storage layer, gravity drainage structure, gravity drainage structure links to each other with diversion well, is used for guaranteeing that rainwater preferentially enters diversion well, after multilevel composite structure, enters underground building gravel water storage layer and carries out water discharge, and guaranteeing that the excess rainwater in diversion well flows into municipal rainwater pipe network, multilevel composite structure, multilevel composite structure includes rainwater filter layer, rainwater storage layer and anti -permeation protection layer that set up in order from top to bottom. The present application has the advantages of high space utilization, no energy consumption operation, high function integration degree.

Description

Technical Field

[0001] This utility model relates to the field of building drainage technology, and in particular to a rainwater drainage device for garage roof slabs. Background Technology

[0002] With the increasing development of underground space in cities, the issue of rainwater drainage from the rooftops of underground parking garages, sunken plazas, and other building structures is becoming increasingly prominent. Due to the unique characteristics of underground building structures, rainwater easily accumulates in the rooftop areas. If it cannot be drained in a timely manner, it may lead to safety hazards such as structural leakage, root rot in plants, and ground subsidence. At the same time, with the promotion of the sponge city concept, rainwater resource utilization has also become an important consideration in the design of urban drainage systems.

[0003] Currently, most underground garage roof rainwater drainage systems use traditional drainage ditches, water storage tanks, or infiltration wells. However, these technologies have many shortcomings: (1) Low space utilization: Traditional water storage tanks or drainage ditches require additional underground or ground space, which is not conducive to the intensive use of urban land resources; (2) High energy consumption: Some systems rely on power equipment such as water pumps for drainage, resulting in high operating costs and the risk of power outages; (3) Single function: Most systems only realize rainwater drainage and lack functions such as water storage and seepage prevention.

[0004] To address the aforementioned issues, existing technologies, such as patents with publication numbers CN214329613U and CN204326390U, have proposed solutions such as siphon drainage and gravel layer drainage. However, these solutions still suffer from problems in practical applications, including low space utilization, high energy consumption, and insufficient functional integration. Utility Model Content

[0005] Therefore, it is necessary to provide a rainwater drainage device for garage roofs to address the aforementioned technical problems, aiming to solve the problems of low space utilization, high energy consumption, and insufficient functional integration in existing rainwater drainage systems for garage roofs.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A rainwater drainage device for garage roof slabs, comprising: a diversion well, wherein the diversion well is provided on the garage roof slab and the vertical depth of the diversion well extends to the underground building gravel water storage layer; a gravity drainage structure, wherein the gravity drainage structure is connected to the diversion well, and is used to ensure that rainwater preferentially enters the diversion well, passes through the multi-level composite structure, and enters the underground building gravel water storage layer for drainage, and to ensure that excess rainwater in the diversion well flows into the municipal rainwater pipe network by gravity; and a multi-level composite structure, wherein the multi-level composite structure includes a rainwater filter layer, a rainwater storage layer, and an impermeable protective layer arranged sequentially from top to bottom.

[0007] As a further embodiment of this utility model, the interior of the diversion well is provided with an HDPE perforated pipe, and the HDPE perforated pipe has through holes distributed in a spiral pattern. A diversion and drainage layer is provided between the diversion well and the HDPE perforated pipe. The diversion and drainage layer contains primary-size crushed stone material wrapped with a first permeable geotextile. The particle size of the primary-size crushed stone material is 30-40mm.

[0008] As a further embodiment of this utility model, the diameter φ of the through hole is 10-15mm, the spacing is 100mm, the helix angle is 30°, and the opening ratio is ≥25%.

[0009] As a further embodiment of this utility model, the self-flowing drainage structure includes an inlet pipe and an outlet pipe. The top elevation of the inlet pipe is lower than the bottom elevation of the outlet pipe. The inlet end of the outlet pipe is connected to the interior of the HDPE perforated pipe, and the outlet end of the outlet pipe is connected to the municipal rainwater pipe network.

[0010] As a further embodiment of this utility model, the rainwater filter layer is provided with a secondary particle size crushed stone material wrapped by a second permeable geotextile. The particle size of the secondary particle size crushed stone material is 10-30mm and the thickness is 300-400mm.

[0011] As a further embodiment of this utility model, the rainwater storage layer is provided with permeable concrete material or honeycomb plastic material with a thickness of 300-500mm.

[0012] As a further embodiment of this utility model, the impermeable protective layer is provided with a non-woven fabric layer and an HDPE impermeable membrane arranged sequentially from top to bottom, with a thickness of 100-150mm.

[0013] This application provides a rainwater drainage device for garage roofs, which has the following advantages: 1. High space utilization: By setting up a diversion well on the garage roof, rainwater from the municipal stormwater pipe network can be quickly discharged to the rainwater drainage device on the garage roof, reducing water accumulation and drainage problems caused by rainwater runoff, alleviating pressure on the municipal pipe network, and the diversion well does not occupy additional land, eliminating the need for additional water storage tanks, effectively improving space utilization. 2. Energy-free operation: By setting up a gravity drainage structure, based on gravity drainage technology, rainwater can preferentially infiltrate into the underground building gravel water storage layer, and excess rainwater can be discharged into the municipal stormwater pipe network by gravity, without the need for power equipment, making it energy-efficient. 3. High degree of functional integration: By setting up a rainwater filtration layer, a rainwater storage layer, and an anti-seepage protection layer, it has rainwater filtration, rainwater storage, structural protection, and anti-seepage functions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the rainwater drainage device for garage roof panels according to this utility model.

[0015] Attached diagram labels: 1. Garage roof slab, 2. Diversion well, 3. Diversion drainage layer, 4. HDPE perforated pipe, 5. Inlet pipe, 6. Outlet pipe, 7. Rainwater filter layer, 8. Rainwater storage layer, 9. Non-woven fabric layer, 10. HDPE geomembrane, 11. Underground building gravel water storage layer. Detailed Implementation

[0016] The embodiments of this application will now be described in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, the following embodiments and features can be combined with each other unless otherwise specified. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0017] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0018] To address the problems of low space utilization, high energy consumption, and insufficient functional integration in existing rainwater drainage systems for garage roofs, this application provides a rainwater drainage device for garage roofs, as shown in the attached figure. Figure 1 The device includes: a diversion well 2, which is installed on the roof slab 1 of the garage and extends vertically to the underground building gravel water storage layer 11; a gravity drainage structure, which is connected to the diversion well 2 to ensure that rainwater preferentially enters the diversion well 2, passes through the multi-level composite structure, and enters the underground building gravel water storage layer 11 for drainage, and ensures that excess rainwater in the diversion well 2 flows into the municipal rainwater pipe network; and a multi-level composite structure, which includes a rainwater filter layer 7, a rainwater storage layer 8, and an impermeable protective layer arranged sequentially from top to bottom.

[0019] In this embodiment, a foundation pit for a diversion well 2 is excavated on the roof slab 1 of the garage. The depth and diameter of the diversion well 2 can be flexibly designed according to actual construction needs. For example, the depth is 2m and the diameter Φ is 600mm. The lower end of the foundation pit for the diversion well 2 is excavated to the underground building gravel water storage layer 11.

[0020] In this embodiment, the interior of the diversion well 2 is provided with an HDPE perforated pipe 4, and the HDPE perforated pipe 4 has through holes distributed in a spiral pattern. A diversion and drainage layer 3 is provided between the diversion well 2 and the HDPE perforated pipe 4. The diversion and drainage layer 3 is provided with primary-size crushed stone material wrapped by a first permeable geotextile. The particle size of the primary-size crushed stone material is 30-40mm.

[0021] In this embodiment, the main body of the diversion well 2 involved in this application has a double-layer structure design. The outer layer is the foundation pit of the diversion well 2, and the inner layer is the HDPE perforated pipe 4. A diversion and drainage layer 3 is set between the two. The diversion and drainage layer 3 is composed of primary-size crushed stone material wrapped with permeable geotextile. It adopts a double filtration design of primary-size crushed stone layer and first geotextile (as the first filtration barrier). It aims to solve the problems in the prior art that traditional rainwater wells are prone to poor drainage due to blockage by debris, and rainwater may carry a large number of impurities when it directly enters the pipe network, affecting the operation of downstream pipe network. By intercepting large particles of impurities (such as silt) in rainwater, it plays the role of diversion and preliminary purification of rainwater. It can prevent silt from directly entering the interior of HDPE perforated pipe 4 and causing blockage of the through holes on HDPE perforated pipe 4, thus extending the service life of this device. At the same time, rainwater can permeate evenly into the interior of HDPE perforated pipe 4 through the diversion and drainage layer 3, improving the permeability of the overall structure.

[0022] In this embodiment, the HDPE perforated pipe 4 involved in this application has through holes distributed in a spiral pattern. The spiral distribution opening design allows the water flow to form a spiral disturbance along the pipe wall of the HDPE perforated pipe 4, thereby enhancing the water flow disturbance and reducing the deposition of particulate matter on the pipe wall. The hole diameter and spacing can be matched with the rainwater flow velocity (e.g., 0.5-1.5m / s) to avoid pore blockage. At the same time, the parameters of the through holes can be set as follows: the spiral angle is 30° (the longitudinal height of each turn is 200mm), the hole diameter φ is 10-15mm (which can be adjusted according to the sand content of the rainwater), the hole spacing is 100mm (the hole spacing along the longitudinal direction), and the through holes are evenly distributed in the circumferential direction.

[0023] In this embodiment, the gravity drainage structure includes an inlet pipe 5 and an outlet pipe 6. The top elevation of the inlet pipe 5 is lower than the bottom elevation of the outlet pipe 6. The inlet end of the outlet pipe 6 is connected to the interior of the HDPE perforated pipe 4, and the outlet end of the outlet pipe 6 is connected to the municipal rainwater pipe network.

[0024] In this embodiment, the front end of the inlet pipe 5 can be connected to the rainwater pipe of the garage roof slab 1. Through the gravity drainage design where the top elevation of the inlet pipe 5 is lower than the bottom elevation of the outlet pipe 6, rainwater can be guaranteed to preferentially enter the diversion well 2, pass through the diversion and drainage layer 3 and enter the HDPE perforated pipe 4. Then, after passing through the rainwater filter layer 7, rainwater storage layer 8 and seepage prevention protection layer arranged in sequence, it enters the gravel water storage layer of the underground building roof slab for drainage. At the same time, it can also ensure that the excess rainwater in the HDPE perforated pipe 4 can flow into the nearest rainwater pipe network (i.e., municipal rainwater pipe network) in the project area. This process is based on gravity drainage technology, which does not require power equipment and is energy-saving and efficient.

[0025] In this embodiment, the rainwater filter layer 7 is provided with secondary-sized crushed stone material wrapped by a second permeable geotextile. The secondary-sized crushed stone material has a particle size of 10-30 mm and a thickness of 300-400 mm.

[0026] In this embodiment, the first geotextile and the second geotextile involved in this application can be made of the same material (e.g., 300g / m²). 2 Long-filament spunbond polyester nonwoven fabric serves to filter fine particles, prevent gravel loss, and maintain water permeability.

[0027] In this embodiment, the rainwater filter layer 7 serves as a second filtration barrier, and the particle size of the secondary particle size crushed stone material is smaller than that of the primary particle size crushed stone material. This allows for secondary filtration and purification of fine particulate impurities in the rainwater, preventing fine particulate impurities (such as fine sand) from entering the rainwater storage layer 8. This avoids the deposition and blockage of the pores of the rainwater storage layer 8 by fine particulate impurities, thus affecting the infiltration efficiency.

[0028] In this embodiment, the rainwater storage layer 8 is provided with permeable concrete material or honeycomb plastic material with a thickness of 300-500mm.

[0029] In this embodiment, the rainwater storage layer 8, formed by using permeable concrete or honeycomb plastic materials, serves the purpose of short-term rainwater storage and relieving drainage pressure. This allows rainwater to be stored in the rainwater storage layer 8 for a short period and gradually infiltrate into the underground gravel water storage layer 11. Furthermore, as a temporary rainwater storage and slow-release area, the rainwater storage layer 8 also provides a water source for subsequent greening irrigation or greywater reuse.

[0030] In this embodiment, the impermeable protective layer is provided with a non-woven fabric layer 9 and an HDPE geomembrane 10 arranged sequentially from top to bottom, with a thickness of 100-150mm.

[0031] In this embodiment, by employing a non-woven fabric layer 9 and an HDPE geomembrane 10 arranged sequentially from top to bottom, the water storage layer and the underground building gravel water storage layer 11 can be effectively isolated, preventing physical damage to the underground building gravel water storage layer 11 caused by particle settling or structural deformation of the water storage layer. The preferred thickness is 100mm. In addition, by setting the HDPE geomembrane 10, rainwater reverse osmosis can also be effectively blocked, ensuring the stability of the overall structure operation.

[0032] In this embodiment, the working principle of this application is as follows: rainwater enters the diversion well 2 through the inlet pipe 5 and first enters the diversion and drainage layer 3. On the one hand, it intercepts large particles of mud and sand in the rainwater to prevent the through holes on the HDPE perforated pipe 4 from being blocked. On the other hand, it can evenly penetrate into the interior of the HDPE perforated pipe 4 through the diversion and drainage layer 3, thereby improving the overall permeability of the structure. Subsequently, the rainwater enters the HDPE perforated pipe 4 and passes through the rainwater filter layer 7, the rainwater storage layer 8 and the seepage prevention protection layer arranged in sequence, before entering the gravel water storage layer on the roof of the underground building for drainage.

[0033] In this embodiment, the rainwater drainage system applied to the roof slab 1 of an underground parking garage in a certain city is used as an example. The green area of ​​the roof slab 1 of the underground parking garage in this city has an area of ​​5000m2 and an annual rainfall of 1200mm. 25 diversion wells 2 are configured in the green area of ​​the roof slab 1 of the underground parking garage, with a spacing of 8m×8m and a control radius of 4m for each well. The water inlet pipe 5 pre-buried in each diversion well 2 is connected to a rainwater pipe with a diameter of 300mm. Through the deployment of the rainwater drainage device for the roof slab of the parking garage in this application, it can be seen through actual application tests that when the rainfall intensity is 50mm / h, the system permeability is 100%, and when the rainfall intensity is 100mm / h, the permeability still reaches 85%, and the overall structure operates stably.

[0034] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A rainwater drainage device for garage roof slabs, characterized in that, include: A diversion well is installed on the roof slab of the garage, and the vertical depth of the diversion well extends to the underground gravel water storage layer. The gravity drainage structure is connected to the diversion well to ensure that rainwater preferentially enters the diversion well, passes through a multi-level composite structure, and enters the underground building gravel water storage layer for drainage, as well as to ensure that excess rainwater in the diversion well flows into the municipal rainwater pipe network by gravity. The multi-level composite structure includes a rainwater filtration layer, a rainwater storage layer, and an impermeable protective layer arranged sequentially from top to bottom.

2. The rainwater drainage device for garage roof slabs according to claim 1, characterized in that, The interior of the diversion well is equipped with an HDPE perforated pipe, and the HDPE perforated pipe has spirally distributed through holes. A diversion and drainage layer is provided between the diversion well and the HDPE perforated pipe. The diversion and drainage layer contains primary-size crushed stone material wrapped with a first permeable geotextile. The primary-size crushed stone material has a particle size of 30-40mm.

3. A rainwater drainage device for garage roofs according to claim 2, characterized in that, The diameter φ of the through holes is 10-15mm, the spacing is 100mm, the helix angle is 30°, and the opening ratio is ≥25%.

4. A rainwater drainage device for garage roof slabs according to claim 2, characterized in that, The gravity drainage structure includes an inlet pipe and an outlet pipe. The top elevation of the inlet pipe is lower than the bottom elevation of the outlet pipe. The inlet end of the outlet pipe is connected to the interior of the HDPE perforated pipe, and the outlet end of the outlet pipe is connected to the municipal stormwater pipe network.

5. A rainwater drainage device for garage roof slabs according to claim 1, characterized in that, The rainwater filtration layer contains secondary-sized crushed stone material wrapped with a second permeable geotextile. The secondary-sized crushed stone material has a particle size of 10-30 mm and a thickness of 300-400 mm.

6. A rainwater drainage device for garage roof slabs according to claim 1, characterized in that, The rainwater storage layer is made of permeable concrete or honeycomb plastic material with a thickness of 300-500 mm.

7. A rainwater drainage device for garage roof slabs according to claim 1, characterized in that, The impermeable protective layer contains a non-woven fabric layer and an HDPE geomembrane arranged sequentially from top to bottom, with a thickness of 100-150mm.

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