Road drainage device with upper ditch and lower culvert
By using the drainage system of upper ditches and lower culverts, and forming a three-dimensional drainage network with drainage green corridors and box culverts, the construction and maintenance difficulties caused by traditional deep-buried pipe networks have been solved, achieving efficient drainage and ecological treatment without traffic interruption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- URBAN PLANNING & DESIGN INST OF SHENZHEN UPDIS
- Filing Date
- 2025-07-29
- Publication Date
- 2026-06-26
AI Technical Summary
In existing urban road drainage systems, the deep burial of underground pipe networks leads to high construction difficulty and cost, and maintenance requires traffic interruption, affecting road use.
The road drainage system, consisting of drainage green corridors, box culverts, and overflow pipes, is constructed using an upper ditch and lower culvert system to form a three-dimensional drainage network. The drainage green corridors are arranged using the space of the road median strip. Only shallow excavation is required during construction, and maintenance can be carried out directly through the green corridor area.
It enables road drainage maintenance without interrupting traffic, reduces construction complexity and cost, improves drainage efficiency, avoids road water accumulation, and forms an efficient three-dimensional drainage system in conjunction with ecological facilities.
Smart Images
Figure CN224412730U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of road drainage technology, and in particular to a road drainage device with an upper ditch and a lower culvert. Background Technology
[0002] In related technologies, urban road drainage systems mainly adopt underground pipe network layout, placing the drainage pipe network system under the carriageway. The pipe network is buried at a great depth, requiring the excavation of a large amount of earthwork during construction, which not only increases the construction difficulty and cost, but also has a significant impact on the surrounding environment. Furthermore, since the pipe network system is located below the road structure layer, routine maintenance and repair require damage to the pavement structure, resulting in high maintenance costs and affecting the normal use of the road. Utility Model Content
[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a road drainage device with an upper ditch and lower culvert. The combination of box culvert, overflow pipe and water collection pipe forms a three-dimensional drainage network to replace the traditional deep buried pipe network. Maintenance can be carried out directly through the green corridor area without interrupting traffic.
[0004] In a first aspect, embodiments of this application provide a road drainage device with an upper ditch and a lower culvert, comprising:
[0005] A drainage green corridor is set between the non-motorized vehicle lane and the motorized vehicle lane. The drainage green corridor is recessed to form a shallow vegetation ditch, and the highest point of the drainage green corridor is lower than the height of the non-motorized vehicle lane and the motorized vehicle lane.
[0006] The box culvert is located below the drainage green corridor;
[0007] An overflow pipe extends into the culvert at one end and passes through the drainage green corridor so that the other end of the overflow pipe extends into the vegetated ditch.
[0008] A water collection pipe is buried in the drainage green corridor. The water collection pipe has a water collection port and is connected to the overflow pipe.
[0009] The road drainage device with upper ditch and lower culvert according to the embodiments of this utility model has at least the following beneficial effects: The drainage green corridor, through its concave design, forms a shallow vegetated ditch lower than the roads on both sides, allowing surface runoff to naturally converge. During normal rainfall, rainwater permeates and filters through the vegetation layer of the shallow ditch and enters the collection pipe, then flows into the box culvert through the overflow pipe. During heavy rain, when the water accumulation in the shallow ditch exceeds its infiltration capacity, the rising water level triggers the overflow pipe to directly guide the excess rainwater into the box culvert. The box culvert, as the main drainage channel, transports rainwater downstream, preventing road flooding. Furthermore, by utilizing the space of the road median strip to arrange the drainage green corridor, the traditional deep-buried pipe network is transformed into a three-dimensional drainage system combining shallow ecological facilities and underground box culverts. Construction only requires shallow excavation, avoiding impact on the carriageway structure. The combination of box culverts and overflow pipes forms a three-dimensional drainage network that replaces the traditional deep-buried pipe network. Maintenance can be performed directly through the green corridor area without interrupting traffic.
[0010] According to the first aspect, in one possible implementation, the drainage green corridor is provided with a planting soil layer and a first gravel layer from top to bottom, and the water collection pipe is buried in the first gravel layer.
[0011] According to the first aspect, in one possible implementation, the thickness of the first gravel layer is 200 mm to 300 mm; and / or,
[0012] The first gravel layer consists of graded gravel with a particle size of 5 mm to 15 mm.
[0013] According to the first aspect, in one possible implementation, the non-motorized vehicle lane includes a permeable pavement structure;
[0014] The drainage device for the road with culverts and drainage ditches also includes drainage ditches and drainage pipes. The drainage ditch is located on the side of the permeable pavement structure near the drainage green corridor. The drainage ditch is used to collect the infiltration flow from the surface of the permeable pavement structure. The first end of the drainage pipe is connected to the drainage ditch, and the second end of the drainage ditch is connected to the vegetation ditch.
[0015] According to the first aspect, in one possible implementation, the drainage ditch is provided with a first slope on the side near the drainage green corridor, and the height of the first slope is set to decrease along the direction near the drainage green corridor.
[0016] The drainage pipe passes through the first slope so that the second end of the drainage pipe is connected to the vegetated ditch.
[0017] According to the first aspect, in one possible implementation, a gravel water distribution layer is further provided between the first slope and the drainage green corridor, and the second end of the drainage pipe is located above the gravel water distribution layer;
[0018] The bottom of the gravel water distribution layer is projected horizontally onto the first gravel layer between the upper and lower edges of the first gravel layer.
[0019] According to the first aspect, in one possible implementation, the permeable pavement structure includes a permeable pavement surface layer, a permeable pavement underlayment layer, and a crushed stone underlayment layer arranged sequentially from top to bottom;
[0020] The permeable pavement surface layer is a permeable concrete layer or a permeable asphalt layer with a porosity of 15% or greater.
[0021] The permeable pavement subbase is a graded gravel layer or crushed stone layer with a particle size of 10mm to 20mm.
[0022] According to the first aspect, in one possible implementation, the side of the motor vehicle lane closest to the drainage green corridor is provided with a second slope, the height of which decreases along the direction closest to the drainage green corridor.
[0023] According to the first aspect, in one possible implementation, the second slope is a second gravel layer, and the bottom of the second slope is projected horizontally onto the first gravel layer between the upper and lower edges of the first gravel layer.
[0024] According to the first aspect, in one possible implementation, the thickness of the drainage green corridor is 1.0m to 1.5m.
[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0027] Figure 1 This is a cross-sectional structural schematic diagram of the drainage device for a road with an upper ditch and a lower culvert in one embodiment of the present invention;
[0028] Figure 2 This is a schematic diagram of the structure of the drainage device for a road with an upper ditch and a lower culvert in one embodiment of the present invention;
[0029] Figure 3 This is a partial structural diagram of a drainage green corridor according to an embodiment of the present invention.
[0030] Figure label:
[0031] 100. Drainage green corridor; 110. Vegetated ditch; 120. Planting soil layer; 130. First gravel layer;
[0032] 200. Non-motorized vehicle lane; 210. Permeable pavement surface layer; 220. Permeable pavement subbase layer; 230. Crushed stone subbase layer;
[0033] 300. Motor vehicle lane;
[0034] 400. Box culvert;
[0035] 500, Overflow pipe;
[0036] 600. Water collection pipe;
[0037] 710. Drainage ditch; 720. Drainage pipe; 730. Gravel aquifer;
[0038] 810, First slope; 820, Second slope. Detailed Implementation
[0039] The embodiments of this utility model are described in detail below. Examples of these 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 utility model, and should not be construed as limiting this utility model.
[0040] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0041] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0042] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0043] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0044] In existing technologies, pipeline systems are laid beneath roadways, resulting in complex and costly construction, operation, and maintenance. Urban road drainage systems often require traffic interruption for excavation for routine maintenance due to the underground pipelines being buried deep beneath the roadways. During the rainy season, pipeline blockages are difficult to address promptly, and road flooding affects traffic efficiency.
[0045] To address the aforementioned problems, this application proposes a road drainage device with an upper ditch and a lower culvert, hereinafter referred to as a road drainage device. For example... Figures 1 to 3 As shown, the road drainage system includes a drainage green corridor 100, a box culvert 400, an overflow pipe 500, and a collection pipe 600. The drainage green corridor 100 is located between the non-motorized vehicle lane 200 and the motorized vehicle lane 300. The drainage green corridor 100 is recessed to form a vegetated ditch 110. The highest point of the drainage green corridor 100 is still lower than the height of the non-motorized vehicle lanes 200 and 300 on both sides. This height difference forms a natural guide surface to guide surface runoff. The box culvert 400 is located below the drainage green corridor 100. One end of the overflow pipe 500 extends into the box culvert 400, and the other end extends into the vegetated ditch 110. The collection pipe 600 is buried inside the drainage green corridor 100, has a collection inlet, and is connected to the overflow pipe 500. The overflow pipe 500 refers to the pipe connecting the box culvert 400 and the vegetated ditch 110, and can be implemented using a perforated pipe or a PVC pipe. The water collection pipe 600 refers to the infiltration water collection device buried in the drainage green corridor 100. Specifically, it can be implemented by using a corrugated pipe with pores, and form a graded drainage network by connecting with the overflow pipe 500.
[0046] In this embodiment, the drainage green corridor 100, through its recessed design, forms a shallow vegetated ditch 110 lower than the roads on both sides, allowing surface runoff to naturally converge. During normal rainfall, rainwater infiltrates and filters through the drainage green corridor 100 before entering the collection pipe 600, and then flows into the box culvert 400 through the overflow pipe 500. During heavy rain, when the water accumulation in the vegetated ditch 110 exceeds its infiltration capacity, the rising water level triggers the overflow pipe 500 to directly guide the excess rainwater into the box culvert 400. The box culvert 400 serves as the main drainage channel, transporting rainwater downstream and preventing road flooding. Furthermore, this embodiment utilizes the space of the road median strip to arrange the drainage green corridor 100, transforming the traditional deep-buried pipe network into a three-dimensional drainage system combining shallow ecological facilities and underground box culverts. Construction only requires shallow excavation, avoiding impact on the carriageway structure. The combination of the box culvert 400, the collection pipe 600, and the overflow pipe 500 forms a three-dimensional drainage network that replaces the traditional deep-buried pipe network. Maintenance can be performed directly through the green corridor area without interrupting traffic.
[0047] Based on the above embodiment, the drainage green corridor 100 is provided with a planting soil layer 120 and a first gravel layer 130 from top to bottom, and the water collection pipe 600 is buried in the first gravel layer 130. The planting soil layer 120 serves as the initial interface for rainwater infiltration, and can intercept some suspended matter through soil pores, reducing the scouring of the road drainage device by surface runoff. The first gravel layer 130 is located below the soil layer, and its large porosity forms a rapid water conduction path, allowing infiltrated rainwater to quickly collect laterally to the water collection pipe 600. The water collection pipe 600 is buried in the gravel layer, which avoids the construction and excavation difficulties caused by burying pipes under the traditional roadway, and utilizes the permeability of the first gravel layer 130 to achieve uniform water collection. When rainwater enters the first gravel layer 130 after being filtered by the planting soil layer 120, the water flows naturally to the water collection pipe 600 through the gravel gaps. The gravel particles also act as interceptors of fine soil particles, preventing pipe blockage.
[0048] The planting soil layer 120 refers to the plant growth substrate covering the surface of the drainage green corridor 100. It can be implemented using a mixture of humus and sandy soil. The porous structure of the planting soil layer 120 promotes rainwater infiltration and intercepts surface impurities. The first gravel layer 130 refers to the gravel filling layer located below the planting soil layer 120. It can be implemented using gravel material with uniform particle size, forming stable water-conducting channels through the gaps between particles while preventing soil particles from entering the water collection pipe 600.
[0049] Along the direction of the road's extension, an overflow pipe 500 is installed every 20 to 30 meters in the drainage green corridor 100, and an inspection well is installed every 50 meters in the drainage green corridor 100.
[0050] In some embodiments, the thickness of the first gravel layer 130 is 200 mm to 300 mm. Specifically, it can be laid in layers and mechanically compacted. By controlling the thickness of the gravel layer to be between 200 mm and 300 mm, sufficient buffer space is ensured for rainwater infiltration, while avoiding excessive thickness that would increase construction costs.
[0051] The first gravel layer 130 can be made of graded gravel with a particle size of 5 mm to 15 mm. Graded gravel refers to an aggregate layer formed by mixing particles of different sizes in a certain proportion. Specifically, gravel of different sizes in the range of 5 mm to 15 mm can be screened, mixed in a predetermined ratio, and then laid. Through the interlocking of particles, a stable pore structure is formed, which can maintain a high permeability rate and effectively intercept suspended solids, thereby improving the stability and durability of the road drainage device.
[0052] The thickness and particle size of the first gravel layer 130 can work together to effectively balance drainage efficiency and anti-clogging requirements. While ensuring rapid removal of surface runoff, the maintenance cycle of the road drainage device is extended by optimizing the gradation structure, and the frequency of dredging caused by pore blockage is reduced.
[0053] Furthermore, the thickness of the drainage green corridor 100 is 1.0 meter to 1.5 meters. The thickness of the drainage green corridor 100 is the vertical distance from the base of the vegetation ditch 110 to the top of the box culvert 400. By limiting this range, the hydraulic connection stability between the drainage green corridor 100 and the box culvert 400 is ensured, while avoiding the waste of resources caused by excessively increasing the thickness of the structural layer.
[0054] The planting soil layer 120 of the drainage green corridor 100 should be planted with flood-tolerant plants, such as reeds and cattails. The width of the vegetation ditch 110 can be greater than or equal to 1.5 meters, and the thickness of the planting soil layer 120 should not be less than 0.8 meters. If trees are to be planted, the thickness of the planting soil layer 120 should be greater than 1.5 meters.
[0055] In practical applications, the planting soil layer 120 can include 60% sand, 30% organic matter, and 10% gravel. The organic matter can be humus, which enhances permeability while meeting the plant's growth needs. The permeability coefficient of the planting soil layer 120 should not be less than 10. -4 cm / s, enabling natural purification and initial filtration of rainwater.
[0056] In some embodiments, the non-motorized vehicle lane 200 includes a permeable pavement structure that allows rainwater to infiltrate rapidly to reduce surface runoff. The road drainage system also includes a drainage ditch 710 and a drainage pipe 720. The drainage ditch 710 is a linear water collection facility located along the edge of the permeable pavement structure. The drainage ditch 710 is situated on the side of the permeable pavement structure closest to the drainage green corridor 100. The drainage ditch 710 can be constructed using concrete or plastic materials. The drainage ditch 710 collects excess infiltration from the surface of the permeable pavement structure, i.e., it intercepts supersaturated water that fails to infiltrate in time. The first end of the drainage pipe 720 is connected to the drainage ditch 710, and the second end of the drainage ditch 710 is connected to the vegetated ditch 110. The drainage pipe 720 is a flow-guiding component connecting the drainage ditch 710 and the vegetated ditch 110, and can specifically be a PVC pipe or HDPE pipe, used to directionally transport the collected runoff to the drainage green corridor 100.
[0057] Specifically, the permeable pavement structure promotes rainwater infiltration through its internal pores, reducing surface runoff. Meanwhile, the drainage ditch 710, arranged along its edges, intercepts supersaturated water that fails to fully infiltrate, preventing road surface flooding. The drainage pipe 720 directly guides the water collected by the drainage ditch 710 into the drainage green corridor 100. This embodiment replaces the traditional pipe network buried under the roadway with a surface road drainage device, achieving efficient collection and drainage of rainwater runoff, avoiding excavation and construction of the roadbed, and simultaneously utilizing the vegetated shallow ditch 110 to achieve ecological treatment of rainwater.
[0058] Along the direction of the road, a drainage pipe 720 is installed every 20 to 30 meters to transport the rainwater collected by the drainage ditch 710 to the drainage green corridor 100.
[0059] Based on the above embodiments, a first slope 810 is provided on the side of the drainage ditch 710 near the drainage green corridor 100. The height of the first slope 810 decreases along the direction near the drainage green corridor 100. The first slope 810 refers to the slope structure formed by the sidewall of the drainage ditch 710 tilting towards the drainage green corridor 100. Specifically, it can be implemented using a trapezoidal cross-section or a sloping structure. The decreasing height of the first slope 810 forms a natural slope to guide the direction of water flow. The drainage pipe 720 passes through the first slope 810 so that the second end of the drainage pipe 720 is connected to the vegetated shallow ditch 110. Specifically, a pre-embedded pipe fitting can be used to make the drainage pipe 720 form a continuous flow channel from the drainage ditch 710 to the drainage green corridor 100.
[0060] The decreasing height of the first slope 810 creates a gradient from high to low, allowing the infiltration flow collected in the drainage ditch 710 to flow naturally towards the drainage corridor 100 under gravity. The drainage pipe 720 is embedded inside the first slope 810, with its first end located at the bottom of the drainage ditch 710 and its second end extending directly above the drainage corridor 100 or being guided through a water distribution structure to the first gravel layer 130 of the drainage corridor 100. This avoids the structural complexity issues caused by burying multiple layers of pipes under the roadway in traditional pipe network systems.
[0061] In one embodiment, a gravel water distribution layer 730 can be provided between the first slope 810 and the drainage green corridor 100. The gravel water distribution layer 730 refers to a transitional structure made of porous permeable material, specifically formed by laying graded gravel with a particle size of 5mm to 15mm. The gravel water distribution layer 730 achieves lateral diffusion and buffering of water flow through its porous structure. The gravel water distribution layer 730 extends a certain length along the road extension direction, and the second end of the drainage pipe 720 is located above the gravel water distribution layer 730. The bottom of the gravel water distribution layer 730 is projected horizontally onto the first gravel layer 130 between the upper and lower edges of the first gravel layer 130. The laying range of the gravel water distribution layer 730 forms a vertically overlapping area with the lower first gravel layer 130, ensuring the permeability continuity of the upper and lower drainage structures.
[0062] Water from drainage pipe 720 first enters the surface of gravel drainage layer 730. The water flow is dispersed through lateral infiltration in the gravel pores, preventing concentrated water flow from directly impacting the vegetated ditch 110. As the water infiltrates step-by-step within the gravel layer, suspended solids are trapped and filtered. Subsequently, it enters the deep drainage structure through the overlapping area between the bottom of gravel drainage layer 730 and the first gravel layer 130. The vertical projection of gravel drainage layer 730 and the first gravel layer 130 ensures the continuity of the drainage path, forming a tiered infiltration system that replaces the diversion function of traditional underground pipe networks.
[0063] In this embodiment, the gravel water distribution layer 730 and the drainage pipe 720 work together to guide the permeable pavement runoff to the vegetated ditch 110, achieving water flow buffering and filtration without the need for deep-buried pipes, significantly reducing construction complexity. The multi-stage permeability of the gravel water distribution layer 730 further reduces the risk of water erosion to the vegetated ditch 110.
[0064] Specifically, the permeable pavement structure includes a permeable pavement surface layer 210, a permeable pavement sub-layer 220, and a crushed stone sub-layer 230 arranged sequentially from top to bottom; the permeable pavement surface layer 210 is a permeable concrete layer or a permeable asphalt layer with a porosity of greater than or equal to 15%; the permeable pavement sub-layer 220 is a graded gravel layer or crushed stone layer with a particle size of 10mm to 20mm.
[0065] The permeable pavement surface layer 210 refers to a surface structure with high permeability, specifically made of permeable concrete or permeable asphalt material with a porosity of not less than 15%. The permeable concrete is preferably of strength grade C20-C30, with a thickness of 60mm to 100mm. The permeable asphalt uses modified asphalt mixture with aggregate particle size of 5mm to 10mm and a thickness of 50mm to 80mm, forming rapid water-conducting channels through interconnected pores to reduce surface runoff retention. The permeable pavement subbase 220 refers to a supporting filter layer located below the surface layer, specifically made of graded gravel or crushed stone with a particle size of 10mm to 20mm. The permeability coefficient of the permeable pavement subbase 220 is greater than or equal to 10. -3 The permeable pavement 220, with a thickness of 150mm to 200mm, maintains permeability through the gaps between particles. It evenly distributes rainwater, prevents surface clogging, and provides compressive strength to prevent surface collapse. The gravel material in the permeable pavement 220 needs to be cleaned to avoid soil contamination. The crushed stone slab 230 is a load-bearing transition layer located at the bottom of the structure. It can specifically use coarse crushed stone or pebbles with a particle size of 20mm to 40mm. The thickness of the crushed stone slab 230 is 100mm to 150mm. The crushed stone slab 230 reduces stress concentration in the base layer by distributing the load and provides a buffer space for the upper permeable water flow, ensuring that rainwater is smoothly guided to the drainage ditch 710 below.
[0066] The high porosity of the permeable pavement surface layer 210 allows rainwater to infiltrate rapidly, preventing water accumulation on the road surface. The permeable pavement subbase 220, through particle size control of graded gravel or crushed stone, maintains a stable infiltration path while supporting the surface layer load. The crushed stone subbase 230 further strengthens the overall structural integrity, preventing road surface deformation caused by vehicle loads. The synergistic effect of each layer ensures the road surface's compressive strength and guides the excess infiltrated flow into the road drainage system layer by layer, avoiding drainage failure caused by insufficient permeability or loose structure in traditional single-material layers.
[0067] In some embodiments, a second slope 820 is provided on the side of the motor vehicle lane 300 near the drainage green corridor 100, and the height of the second slope 820 decreases along the direction near the drainage green corridor 100. The second slope 820 refers to an inclined structure set at the junction of the motor vehicle lane 300 and the drainage green corridor 100, forming a transition surface from the motor vehicle lane 300 to the drainage green corridor 100 through slope changes. By controlling the decreasing slope, the second slope 820 allows runoff to naturally flow down the slope surface to the drainage green corridor 100. The decreasing slope setting means that the top of the second slope 820 is flush with the road surface of the motor vehicle lane 300, and the bottom extends to the edge of the drainage green corridor 100. Specifically, a linear slope or a stepped slope can be used to achieve this. The slope change forms a continuous water flow channel, allowing the surface runoff of the motor vehicle lane 300 to be evenly distributed along the slope surface, avoiding concentrated water impact.
[0068] The second slope 820, with its gradually decreasing gradient, forms a transition zone between the motor vehicle lane 300 and the drainage green corridor 100. During rainfall, surface runoff from the motor vehicle lane 300 flows naturally along the slope into the vegetated shallow ditches 110 of the drainage green corridor 100, preventing water from stagnating and forming pooled water at the junction. The controlled slope keeps the water flow velocity within a reasonable range, preventing high-speed water flow from eroding and damaging the roadbed while ensuring the continuity of the drainage path.
[0069] When the second slope 820 can also be made of permeable materials, it can further reduce the risk of road surface water accumulation by assisting drainage through internal infiltration. Specifically, the second slope 820 is a second gravel layer, and the bottom of the second slope 820 is projected horizontally onto the first gravel layer 130 between its upper and lower edges. The second gravel layer refers to a slope structure layer composed of gravel materials, specifically graded gravel with a particle size of 5mm to 15mm. Its porous nature can enhance permeability and disperse the scouring force of water flow. The bottom projection being located between the upper and lower edges of the first gravel layer 130 means that the horizontal extension of the second gravel layer spatially overlaps with the first gravel layer 130 inside the drainage green corridor 100. This can be achieved by adjusting the laying width and slope of the second gravel layer to ensure the continuous connection of the drainage paths of the two gravel structures.
[0070] The second gravel layer replaces traditional concrete or soil slopes, utilizing the gaps between gravel particles to create infiltration channels, allowing surface runoff from the driveway 300 to quickly infiltrate into the drainage green corridor 100. The overlapping design between the bottom of the second gravel layer and the first gravel layer 130 creates a staggered connection in the vertical direction, preventing drainage interruptions caused by structural layering. When water flows from the second gravel layer into the first gravel layer 130, it transitions smoothly through the overlapping area, reducing the risk of stagnation or blockage at the interface due to material differences. Simultaneously, the self-weight and gradation characteristics of the gravel layer improve the slope's resistance to deformation.
[0071] It is understandable that both the non-motorized vehicle lane 200 and the motorized vehicle lane 300 are inclined in the direction close to the drainage green corridor 100, and the slope can be designed to be 0.5% to 1%, guiding rainwater to the drainage ditch 710 or the vegetated ditch 110.
[0072] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.
Claims
1. A road drainage device with an upper ditch and a lower culvert, characterized in that, include: A drainage green corridor is set between the non-motorized vehicle lane and the motorized vehicle lane. The drainage green corridor is recessed to form a shallow vegetation ditch, and the highest point of the drainage green corridor is lower than the height of the non-motorized vehicle lane and the motorized vehicle lane. The box culvert is located below the drainage green corridor; An overflow pipe extends into the culvert at one end and passes through the drainage green corridor so that the other end of the overflow pipe extends into the vegetated ditch. A water collection pipe is buried in the drainage green corridor. The water collection pipe has a water collection port and is connected to the overflow pipe.
2. The road drainage device with upper ditch and lower culvert according to claim 1, characterized in that, The drainage green corridor is provided with a planting soil layer and a first gravel layer from top to bottom, and the water collection pipe is buried in the first gravel layer.
3. The road drainage device with upper ditch and lower culvert according to claim 2, characterized in that, The thickness of the first gravel layer is 200 mm to 300 mm; and / or, The first gravel layer consists of graded gravel with a particle size of 5 mm to 15 mm.
4. The road drainage device with upper ditch and lower culvert according to claim 2, characterized in that, The non-motorized vehicle lane includes a permeable pavement structure; The drainage device for the road with culverts and drainage ditches also includes drainage ditches and drainage pipes. The drainage ditch is located on the side of the permeable pavement structure near the drainage green corridor. The drainage ditch is used to collect the infiltration flow from the surface of the permeable pavement structure. The first end of the drainage pipe is connected to the drainage ditch, and the second end of the drainage ditch is connected to the vegetation ditch.
5. The road drainage device with upper ditch and lower culvert according to claim 4, characterized in that, The drainage ditch is provided with a first slope on the side near the drainage green corridor, and the height of the first slope decreases along the direction near the drainage green corridor. The drainage pipe passes through the first slope so that the second end of the drainage pipe is connected to the vegetated ditch.
6. The road drainage device with upper ditch and lower culvert according to claim 5, characterized in that, A gravel water distribution layer is also provided between the first slope and the drainage green corridor, and the second end of the drainage pipe is located above the gravel water distribution layer; The bottom of the gravel water distribution layer is projected horizontally onto the first gravel layer between the upper and lower edges of the first gravel layer.
7. The road drainage device with upper ditch and lower culvert according to claim 4, characterized in that, The permeable pavement structure includes, from top to bottom, a permeable pavement surface layer, a permeable pavement underlayment layer, and a crushed stone underlayment layer; The permeable pavement surface layer is a permeable concrete layer or a permeable asphalt layer with a porosity of 15% or greater. The permeable pavement subbase is a graded gravel layer or crushed stone layer with a particle size of 10mm to 20mm.
8. The road drainage device with upper ditch and lower culvert according to claim 2, characterized in that, The motor vehicle lane is provided with a second slope on the side closest to the drainage green corridor, and the height of the second slope decreases along the direction closest to the drainage green corridor.
9. The road drainage device with upper ditch and lower culvert according to claim 8, characterized in that, The second slope is a second gravel layer, and the bottom of the second slope is projected horizontally onto the first gravel layer between the upper and lower edges of the first gravel layer.
10. The road drainage device with upper ditch and lower culvert according to claim 1, characterized in that, The thickness of the drainage green corridor is 1.0m to 1.5m.