Low-carbon urban green space permeable drainage footpath structure

Abstract

The application discloses a kind of low-carbon city greenbelt's water-permeable drainage footpath structure, belong to functional construction technical field, this structure is aimed at the problem that existing water-permeable drainage footpath rainwater is easy to infiltrate subgrade, its technical key points are as follows: pouring concrete slope layer that is inclined downward on soil layer, and water-collecting pipe is embedded in low place of slope layer;Waterproof layer, water-permeable concrete cushion layer and water-permeable concrete surface layer are sequentially laid on concrete slope layer, and waterproof layer is formed into three-layer sandwich structure by double-layer waterproof geotextile and intermediate polycarbonate resistance plate;Water-collecting pipe side has water-permeable hole, and water-permeable hole is covered with metal mesh, and both are fixed by water-permeable geotextile winding, and water-collecting pipe middle section is connected with tee pipe and extends to rainwater well, and the thickness of water-permeable concrete cushion layer is greater than that of water-permeable concrete surface layer.This structure can reduce rainwater infiltration subgrade, enhance rainwater storage capacity, realize rainwater resource utilization, and meet the concept of low-carbon city construction.

Description

Technical Field

[0001] This utility model relates to the field of functional construction technology, and in particular to a permeable drainage walkway structure for low-carbon urban green spaces. Background Technology

[0002] In the construction of low-carbon urban green spaces, permeable drainage walkways are an important component, and their construction must take into account rainwater infiltration, storage, and resource utilization. Currently, permeable concrete is a commonly used material, which is made by mixing various materials such as small stones, high-grade concrete, and permeable admixtures in a certain proportion, and is suitable for non-motorized vehicle lanes.

[0003] In practical applications, permeable concrete is often poured on top of conventional concrete. Although it can collect rainwater through built-in perforated drainage pipes, a significant amount of rainwater still seeps into the conventional concrete. This not only affects the drainage effect of the walkway but may also cause rainwater to further seep into the underground subgrade, softening and settling the subgrade, shortening the lifespan of the walkway, and increasing maintenance costs.

[0004] To address the aforementioned issues, this utility model document proposes a permeable drainage walkway structure for low-carbon urban green spaces. Utility Model Content

[0005] This invention provides a permeable drainage walkway structure for low-carbon urban green spaces, which solves the problem that in the prior art, permeable concrete is often poured on top of conventional concrete. Although rainwater can be collected through built-in perforated drainage pipes, a lot of rainwater still seeps into the conventional concrete. This not only affects the drainage effect of the walkway, but may also cause rainwater to seep further into the underground subgrade, causing the subgrade to soften and settle, shortening the lifespan of the walkway, and increasing maintenance costs.

[0006] This utility model provides the following technical solution: A permeable drainage walkway structure for low-carbon urban green spaces includes: The soil layer has a downward-sloping concrete slope layer poured on top of it. A water collection pipe is embedded and fixed at the lower part of the top of the concrete slope layer. A waterproof layer is laid on top of the concrete slope layer. A permeable concrete cushion layer is poured on top of the waterproof layer. The top of the water collection pipe is covered by the permeable concrete cushion layer. A permeable concrete surface layer is poured on top of the permeable concrete cushion layer.

[0007] In one possible design, the waterproof layer is a three-layer sandwich structure consisting of two layers of waterproof geotextile and an intermediate polycarbonate sheet bonded together.

[0008] In one possible design, the endurance plate is made of high-performance engineering plastic polycarbonate.

[0009] In one possible design, a row of permeable holes is provided on the side of the water collection pipe, and the permeable holes are covered with a metal mesh to prevent them from being blocked. The metal mesh is wrapped and fixed to the water collection pipe by a permeable geotextile.

[0010] In one possible design, the middle section of the water collection pipe is connected to a tee pipe, the output end of which extends to the rainwater well.

[0011] In one possible design, the thickness of the permeable concrete subbase is greater than that of the permeable concrete surface layer.

[0012] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0013] The working principle and usage process of this technical solution are as follows: When rainwater infiltrates, it first contacts the permeable concrete surface layer. Its porous structure allows rainwater to quickly infiltrate into the permeable concrete subbase. The subbase, acting as a transition layer, further guides the rainwater downwards. Simultaneously, its greater thickness compared to the surface layer enhances rainwater storage capacity and alleviates instantaneous drainage pressure. The waterproof layer, consisting of a double-layer waterproof geotextile and an intermediate polycarbonate sheet forming a three-layer sandwich structure, effectively reduces further rainwater infiltration into the concrete slope layer, thus helping to prevent rainwater from seeping into the subgrade and causing softening of the roadbed. Furthermore, the downward sloping structure of the concrete slope layer can guide the lateral flow of rainwater, allowing rainwater blocked by the waterproof layer to flow along the slope to the water collection pipe embedded at a lower level. The side of the water collection pipe is equipped with permeable holes, and the metal mesh is wrapped and fixed at the permeable holes by permeable geotextile. This not only prevents large particles of impurities from clogging the permeable holes, but also allows rainwater to enter the water collection pipe after being filtered through the permeable geotextile. The middle section of the water collection pipe is connected to a T-junction to transport the collected rainwater to the rainwater well, realizing the utilization of rainwater resources (such as irrigation, groundwater replenishment, etc.).

[0014] This utility model has the following beneficial effects: In this invention, the waterproof layer adopts a three-layer sandwich structure consisting of a double-layer waterproof geotextile and a middle polycarbonate endurance board. The waterproof geotextile can effectively prevent water penetration, while the polycarbonate endurance board has high strength and corrosion resistance, further enhancing the stability and durability of the waterproof layer. This greatly reduces the possibility of rainwater continuing to seep into the concrete slope layer and the soil layer, effectively avoiding problems such as roadbed softening and settlement caused by rainwater infiltration, extending the service life of the walkway, and reducing maintenance costs.

[0015] In this invention, the permeable concrete subbase enhances the overall rainwater storage capacity of the walkway, effectively alleviating instantaneous drainage pressure during periods of heavy rainfall. The downward sloping structure of the concrete slope provides a natural flow direction for rainwater, precisely guiding rainwater blocked by the waterproof layer along the slope to the embedded collection pipe at the lower level. The collection pipe has permeable holes on its side, which, together with the filtration structure of metal mesh and permeable geotextile, not only prevents large particles of impurities from clogging the permeable holes, but also performs preliminary filtration of rainwater, reducing the impurity content in the rainwater.

[0016] This utility model uses a three-way pipe to transport collected rainwater to a rainwater well, which facilitates the resource utilization of rainwater. The collected rainwater can be further treated and used for irrigation of urban green spaces, road cleaning, landscape water replenishment, etc., realizing the recycling of water resources, reducing dependence on the urban water supply system, and conforming to the concept of low-carbon city construction. Attached Figure Description

[0017] Figure 1 A partial cross-sectional view of a permeable drainage walkway structure for a low-carbon urban green space provided in an embodiment of this utility model. Figure 2 A schematic diagram of the waterproof layer structure of a permeable drainage walkway in a low-carbon urban green space provided for an embodiment of this utility model; Figure 3 A schematic diagram of the water collection pipe structure of a permeable drainage walkway for a low-carbon urban green space provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the metal mesh and water collection pipe separation structure of a permeable drainage walkway for a low-carbon urban green space, provided as an embodiment of the present invention.

[0018] Reference numerals: 1. Plain soil layer; 2. Concrete slope layer; 3. Waterproof layer; 4. Permeable concrete subbase; 5. Permeable concrete surface layer; 6. Waterproof geotextile; 7. Polycarbonate sheet; 8. Water collection pipe; 9. Permeable hole; 10. Metal mesh; 11. Permeable geotextile; 12. T-pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted. Example:

[0022] Please refer to Figure 1-4 A permeable drainage walkway structure for low-carbon urban green spaces, used in the construction of permeable drainage walkways, includes components such as: a subgrade layer 1, a concrete slope layer 2, a waterproof layer 3, a permeable concrete subbase layer 4, a permeable concrete surface layer 5, and a drainage pipe 8. At the construction site, the subgrade layer 1 is first leveled and compacted to ensure that its surface is flat and firm and that its bearing capacity meets the design requirements. The thickness of subgrade layer 1 is determined according to the actual project needs and geological conditions, and is generally not less than 300mm to ensure the stability of the walkway foundation.

[0023] A concrete slope layer 2 is poured on top of the subgrade soil layer 1. The concrete slope layer 2 uses C20 or higher grade concrete and is poured downwards at the designed slope, with the slope controlled between 1% and 3% to allow rainwater to flow smoothly laterally. During the pouring process, a vibrating device is used to fully vibrate the concrete to ensure that it is dense and free from defects such as honeycomb or pitting. After the concrete slope layer 2 reaches a certain strength, a fixed water collection pipe 8 is embedded at the bottom of its top. The water collection pipe 8 is made of PVC pipe or steel pipe with a diameter of 100mm-200mm and is embedded to a depth of 1 / 2 to 2 / 3 of the thickness of the concrete slope layer 2. This ensures that the water collection pipe 8 is stable and tightly bonded to the concrete slope layer 2 to prevent rainwater from leaking out at the joint.

[0024] A waterproof layer 3 is laid on top of the concrete slope layer 2. The waterproof layer 3 consists of a three-layer sandwich structure formed by two layers of waterproof geotextile 6 and a polycarbonate sheet 7 bonded in the middle. The waterproof geotextile 6 is made of high-density polyethylene (HDPE) with a unit area mass of not less than 300 g / m² and a tensile strength of not less than 15 kN / m, effectively preventing water penetration. The polycarbonate sheet 7 is made of high-performance engineering plastic polycarbonate with a thickness of 3 mm-5 mm, possessing high strength and corrosion resistance, enhancing the stability and durability of the waterproof layer 3. During installation, first, a layer of waterproof geotextile 6 is laid flat on the concrete slope layer 2, leaving a certain length at the edges for overlap and fixation. Then, the polycarbonate sheet 7 is placed on top of the waterproof geotextile 6, and a two-component polyurethane structural adhesive is used to bond the polycarbonate sheet 7 to the waterproof geotextile 6. Adhesive fixing; finally, lay another layer of waterproof geotextile 6 and fix it with adhesive in the same way. The coating amount is controlled at 300g / ㎡ to ensure that the three-layer structure is tightly bonded and without gaps. The edge of the waterproof layer 3 is fixed to the surface of the concrete slope layer 2 with U-shaped steel nails.

[0025] A row of permeable holes 9 are drilled on the side of the water collection pipe 8. The diameter of the permeable holes 9 is 10mm-20mm and the spacing is 50mm-100mm to ensure that rainwater can enter the water collection pipe 8 smoothly. The permeable holes 9 are covered with a metal mesh 10 to prevent them from being blocked. The metal mesh 10 is made of stainless steel and the mesh diameter is 3mm-5mm. It can prevent large particles of impurities from blocking the permeable holes 9 and also ensure that rainwater can pass through. The metal mesh 10 and the water collection pipe 8 are fixed together by wrapping with permeable geotextile 11. The permeable geotextile 11 is made of polyester filament permeable geotextile with a unit area mass of 200g / ㎡-300g / ㎡. It has good water permeability and filtration performance. When wrapping, the permeable geotextile 11 is tightly wrapped around the outside of the water collection pipe 8 and the metal mesh 10 and fixed firmly with iron wire or special straps to prevent rainwater from washing away and causing it to fall off.

[0026] The middle section of the water collection pipe 8 is connected to a tee pipe 12. The tee pipe 12 is made of the same material and specifications as the water collection pipe 8 and is tightly connected to the water collection pipe 8 by heat fusion butt welding. The output end of the tee pipe 12 extends to the rainwater well. The connection is made by rubber sealing ring socket connection. A sedimentation zone (depth 500mm) and an overflow pipe (nominal diameter 300mm) are set in the rainwater well. The top elevation of the overflow pipe is 100mm lower than the surface of the permeable concrete surface layer 5 to ensure the safe discharge of excess rainwater during heavy rain.

[0027] A permeable concrete cushion layer 4 is poured on top of the waterproof layer 3, and the top of the water collection pipe 8 is covered by the permeable concrete cushion layer 4. The permeable concrete cushion layer 4 is made by mixing small stones, high-grade concrete, permeable admixtures, water, color hardeners, and stabilizers in a certain proportion. The thickness of the permeable concrete cushion layer 4 is greater than that of the permeable concrete surface layer 5, generally controlled between 100mm and 150mm, to enhance rainwater storage capacity and alleviate instantaneous drainage pressure. During the pouring process, the slump of the permeable concrete is controlled to ensure good fluidity and permeability. A plate vibrator is used for compaction to avoid over-vibration that would reduce permeability. After pouring, it is covered and cured in a timely manner for no less than 7 days to ensure that the permeable concrete cushion layer 4 reaches the design strength.

[0028] A permeable concrete surface layer 5 is poured on top of the permeable concrete subbase 4. The material ratio and construction process of the permeable concrete surface layer 5 are similar to those of the permeable concrete subbase 4, but the thickness is relatively thin, generally controlled between 40mm and 60mm. The surface of the permeable concrete surface layer 5 can be embossed, dyed, etc., as required to improve the aesthetics of the walkway. After pouring, it is also covered and cured to ensure that the permeable concrete surface layer 5 reaches the pouring strength and performance.

[0029] Through the above construction steps, the permeable drainage walkway structure of the low-carbon urban green space is completed. This walkway structure can effectively realize rainwater infiltration, storage and resource utilization, reduce rainwater damage to the roadbed, extend the service life of the walkway, and meet the requirements of low-carbon city construction.

[0030] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0031] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A permeable drainage walkway structure for low-carbon urban green spaces, characterized in that, include: Plain soil layer (1), the top of the plain soil layer (1) is poured with a downward sloping concrete slope layer (2), a water collection pipe (8) is embedded and fixed at the low point of the top of the concrete slope layer (2), a waterproof layer (3) is laid on the top of the concrete slope layer (2), a permeable concrete cushion layer (4) is poured on the top of the waterproof layer (3), the top of the water collection pipe (8) is covered by the permeable concrete cushion layer (4), and a permeable concrete surface layer (5) is poured on the top of the permeable concrete cushion layer (4).

2. The permeable drainage walkway structure for low-carbon urban green space according to claim 1, characterized in that, The waterproof layer (3) is a three-layer sandwich structure consisting of a double-layer waterproof geotextile (6) and a polycarbonate sheet (7) fixed in the middle with adhesive.

3. The permeable drainage walkway structure for low-carbon urban green space according to claim 2, characterized in that, The endurance board (7) is made of high-performance engineering plastic polycarbonate.

4. The permeable drainage walkway structure for low-carbon urban green space according to claim 1, characterized in that, The side of the water collection pipe (8) is provided with a row of permeable holes (9), and the permeable holes (9) are covered with a metal mesh (10) to prevent them from being blocked. The metal mesh (10) and the water collection pipe (8) are wrapped and fixed by a permeable geotextile (11).

5. The permeable drainage walkway structure for low-carbon urban green space according to claim 4, characterized in that, The middle section of the water collection pipe (8) is connected to a three-way pipe (12), and the output end of the three-way pipe (12) extends to the rainwater well.

6. The permeable drainage walkway structure for low-carbon urban green space according to claim 1, characterized in that, The thickness of the permeable concrete subbase (4) is greater than that of the permeable concrete surface layer (5).

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