Rainwater drainage system and implementation method thereof

Abstract

The rainwater drainage system comprises a drainage ditch body structure, a curb structure and a filtering structure, a water inlet is formed in the top of the drainage ditch body structure, a dust and sand position and a drainage opening are formed in the ditch bottom, the drainage opening is located above the dust and sand position, the drainage opening is connected with a drainage pipe, and the curb structure comprises curbs. A notch is formed in the curb and communicated with the water inlet, and the filtering structure is arranged at the water inlet. Sediment, garbage and the pipeline are isolated through the dust and sand position and the filtering structure, during desilting, only deposited silt in the dust and sand position needs to be cleaned, large machines do not need to be used for dredging the pipeline, and maintenance is extremely easy and convenient. The notch in the curb is communicated with the water inlet, water can enter the curb through the notch, damage to the road surface is reduced, and the problem that a cast iron grate laid on the road surface and an exposed groove seam are prone to generating driving noise is solved.

Description

Technical Field

[0001] This application relates to the fields of municipal engineering and road drainage technology, and in particular to rainwater drainage systems and their implementation methods. Background Technology

[0002] In modern urban construction, road drainage systems are the "blood vessels" that ensure the safe operation of the city. Traditional roadside storm drains, commonly known as "rain grates," are usually made of cast iron or precast concrete blocks, which have many drawbacks: First, the problem of blockage is severe. Traditional storm drains are directly connected to drainage pipes, making it easy for debris such as mud, fallen leaves, and plastic bags on the road to be washed in by rainwater, directly clogging the drainage pipes or accumulating at the bottom of the ditches, leading to poor drainage. Frequent urban flooding during heavy rains is largely due to the failure of these storm drains.

[0003] Secondly, dredging and maintenance are difficult. Traditional storm drains have a compact structure, and once blocked, the heavy cast iron covers need to be manually removed for cleaning, resulting in a harsh working environment and low efficiency. Because silt and sand mix with the bottom of the pipe, dredging is often incomplete, requiring frequent and repeated operations, which greatly increases municipal maintenance costs.

[0004] Third, they are prone to noise generation. Traditional cast iron grates and exposed grooves easily generate vehicle noise, such as the clanging sound of wheels running over the grates. In today's era of advocating "urban furniture" aesthetics and the concept of sponge cities, traditional storm drains can no longer meet the requirements of high-quality urban landscapes.

[0005] Fourth, the structure is too simple. Most existing storm drains only consider drainage function and lack the function of filtering and purifying initial rainwater. This results in the direct discharge of road pollutants carried by initial rainwater into natural water bodies, causing non-point source pollution. Summary of the Invention

[0006] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This part of the invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0008] Therefore, a first aspect of the present invention provides a rainwater drainage system.

[0009] A second aspect of the present invention provides a method for implementing a rainwater drainage system.

[0010] In view of the above, a rainwater drainage system is provided according to a first aspect of the embodiments of this application, comprising: A drainage ditch structure, wherein a water inlet is provided at the top of the drainage ditch structure, and a dust and sand level and a drain outlet are provided at the bottom of the ditch, with the drain outlet located above the dust and sand level; A curb structure, the curb structure including a curb, the curb having a notch, the notch communicating with the water inlet; A filter structure is provided at the water inlet.

[0011] In one feasible implementation, the filtering structure includes: A filter screen is disposed at the notch and is fixedly connected to the toothed surface. The pore size of the filter screen is 2mm to 5mm.

[0012] In one feasible implementation, the diameter of the filter mesh is not less than 1 mm, the filter surface of the filter mesh is set as an arc surface or a plane, the distance between the bottom edge of the filter mesh and the bottom of the drainage ditch structure is not less than 100 mm, and the top edge of the filter mesh is not higher than the curb.

[0013] In one feasible implementation, a water guide groove is provided on the side of the curb, the width of the water guide groove is 50mm to 100mm, the depth of the water guide groove is 30mm to 50mm, and the water guide groove is connected to the notch.

[0014] In one feasible implementation, a drainage slope is provided at the bottom of the notch, and a grid strip is provided at the notch of the curb.

[0015] In one feasible implementation, the drainage ditch structure includes: The ditch wall and the ditch bottom are provided with a slope towards the water inlet. The height of the dust and sand level is set so that the distance from the lowest point of the ditch bottom is not less than 50mm. A dust and sand buffer layer is provided at the bottom of the dust and sand level.

[0016] In one feasible implementation, the masonry materials for the trench walls and the trench bottom include bricks, cement mortar plaster, and waterproof coating. The thickness of the cement mortar plaster is not less than 20 mm, and the waterproof coating is applied at least twice, with a thickness of not less than 1.5 mm.

[0017] In one feasible implementation, the rainwater drainage system further includes a cover structure, the cover structure comprising: A permeable cover plate is provided on the top of the drainage ditch structure. The permeable cover plate has an opening ratio of not less than 30% and a single hole size of not more than 50mm × 100mm. A fall-prevention net is installed on top of the permeable cover plate, and the mesh size of the fall-prevention net is no greater than 30mm × 30mm; A pebble layer is placed on top of the fall protection net.

[0018] In one feasible implementation, the pebble layer has a pebble particle size range of 40mm to 60mm, a Mohs hardness of not less than 6, a water absorption rate of not more than 2%, and the pebble is treated with acid washing and matte polishing.

[0019] According to a second aspect of the embodiments of this application, a method for implementing a rainwater drainage system is provided, applicable to the rainwater drainage system described in any of the above-mentioned technical solutions. The method includes the following steps: Excavate the foundation trench; A cushion layer is poured onto the foundation trench; A drainage ditch structure is arranged on the cushion layer; Dust and sand storage areas and drainage pipes are arranged and installed within the drainage ditch structure. A curb is installed on the top inlet side of the drainage ditch structure; A covering structure is laid on top of the drainage ditch structure.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects: The rainwater drainage system provided in this application includes a drainage ditch structure, a curb structure, and a filter structure. The drainage ditch structure has an inlet at the top and a dust / sand level and a drain outlet at the bottom. The dust / sand level is located below the drain outlet, which connects to a drain pipe. The curb structure includes a curb with a notch that connects to the inlet. The filter structure is located at the inlet. The inner side of the curb uses a specially shaped curb; this is not a regular right-angle curb but a precast concrete component with a water-guiding groove on the side, which can quickly guide rainwater from the road surface into the rainwater inlet. It also has a smooth appearance and blends naturally with the road surface. The dust / sand level and filter structure isolate silt, garbage, and pipes. During dredging, only the deposited silt in the dust / sand level needs to be cleaned; there is no need to use large machinery to dredge the pipes, making maintenance extremely simple. Connecting the notch on the curb to the inlet allows water to enter through the notch, reducing damage to the road surface and avoiding the noise problems caused by exposed cast iron grates and ditch seams.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic structural diagram of a rainwater drainage system according to an embodiment of this application; Figure 2 A schematic structural diagram of a rainwater drainage system according to an embodiment of this application, viewed from the side. Figure 3 A schematic structural diagram of a rainwater drainage system according to an embodiment of this application, viewed from above. Figure 4 A schematic structural diagram of the curb of a rainwater drainage system according to an embodiment of this application; Figure 5 A schematic flowchart illustrating an embodiment of a rainwater drainage system provided in this application.

[0023] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100 Drainage ditch structure, 200 curb structure, 300 filtration structure, 400 covering structure; 101 Dust and sand level, 102 Drainage outlet; 201 curb, 202 gap, 203 drainage slope; 401 permeable cover, 402 anti-fall net, 403 pebble layer. Detailed Implementation

[0024] The following description provides numerous specific details to offer a more thorough understanding of the technical solutions provided by this invention. However, it will be apparent to those skilled in the art that the technical solutions provided by this invention can be implemented without one or more of these details.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated feature, integral, step, operation, part, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or combinations thereof.

[0026] Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0027] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0028] like Figures 1 to 4 As shown, a rainwater drainage system is proposed according to a first aspect of the embodiments of this application, including a drainage ditch structure 100, a curb structure 200, and a filter structure 300. The top of the drainage ditch structure 100 is provided with an inlet, and the bottom of the ditch is provided with a dust / sand level 101 and a drain outlet 102. The dust / sand level 101 is located below the drain outlet 102. The drain outlet 102 is connected to a drain pipe. The drain pipe is an HDPE double-wall corrugated pipe or a PVC-U drain pipe with a diameter of DN200 to DN300 and a ring stiffness of not less than 8 kN / m. 2 The drainage pipe is laid on a support above the dust and sand level 101, and the bottom elevation of the pipe is at least 50mm higher than the bottom elevation of the dust and sand level 101. The curb structure 200 includes a curb 201 with a notch 202 that connects to the water inlet. A filter structure 300 is installed at the water inlet. The inner side of the road uses a specially shaped curb 201. This curb 201 is not an ordinary right-angle curb, but a specially made precast concrete component with a water guide groove on the side, which can quickly guide rainwater from the road surface into the rainwater inlet, and has a smooth appearance that blends naturally with the road surface.

[0029] In this technical solution, the specific selection of the drainage pipe diameter is determined based on the design drainage flow rate and catchment area. For example, in general sidewalks or non-motorized vehicle lanes with small catchment areas, a DN200 pipe diameter can be selected, which is sufficient to meet daily drainage needs; while in low-lying areas of main roads with large catchment areas or large rainstorm runoff, a DN300 pipe diameter is selected to ensure smooth drainage. The pipe material ring stiffness requirement is not less than 8kN / m. 2Specifically, SN8 grade HDPE double-wall corrugated pipes can be used. Their outer wall has a ring-shaped corrugated structure, which effectively resists deformation caused by soil pressure and ground vehicle loads, preventing pipe collapse and drainage problems. The drainage pipe is laid above the dust and sand level 101 via supports, ensuring the pipe bottom elevation is at least 50mm higher than the bottom of the dust and sand level 101. When rainwater containing silt enters the ditch, the flow velocity decreases, and large particles of silt settle to the bottom of the dust and sand level 101 under gravity. Because the drainage pipe is higher than the settlement zone, the deposited silt is isolated below the pipe bottom, effectively preventing silt from directly entering the pipe interior.

[0030] Understandably, by setting up an independent dust and sand level 101 and raising the drainage outlet 102, the system achieves mud-water separation using the principle of gravity settling. This significantly reduces the risk of siltation caused by mud and sand entering the municipal pipe network and lowers the cost of subsequent dredging and maintenance. At the same time, by selecting pipes with specific ring stiffness and materials, the system ensures structural stability and corrosion resistance during long-term underground use, extending the system's service life.

[0031] like Figure 1 and Figure 3 As shown, in one feasible embodiment, the filter structure 300 includes a filter screen disposed at the notch 202, the filter screen is fixedly connected to the curb 201, and the pore size of the filter screen is 2mm to 5mm.

[0032] In this technical solution, the specific setting of the filter mesh aperture needs to balance water permeability and interception effect. For example, on both sides of roads with a lot of fallen leaves, a smaller aperture of 2mm or 3mm can be selected to effectively intercept larger floating debris such as leaves and cigarette butts carried by road runoff. In areas with mainly sediment deposition and high drainage requirements, a 5mm aperture can be selected to reduce flow resistance while ensuring the interception of large debris. The filter mesh can be made of stainless steel wire mesh or high-strength nylon mesh, and fixed to the notch 202 of the curb 201 by bolts or clips. When rainwater flows through the notch 202, the filter mesh acts as the first physical barrier, intercepting solid waste outside the drainage ditch, allowing only water and fine particles to pass through.

[0033] Understandably, by setting up filters with a reasonable pore size range, it is possible to intercept road debris from entering the drainage ditch at the source, preventing debris from clogging drainage pipes and subsequent municipal pipe networks. At the same time, it is also convenient for sanitation workers to directly clean up the intercepted debris on the road, reducing the difficulty of cleaning and improving the system's maintenance convenience.

[0034] In one feasible implementation, the diameter of the filter mesh wire is not less than 1 mm, the filter surface of the filter mesh is set as an arc surface or a plane, the distance between the bottom edge of the filter mesh and the bottom of the drainage ditch structure 100 is not less than 100 mm, and the top edge of the filter mesh is not higher than the curb 201.

[0035] In this technical solution, the shape of the filter surface can be specifically set according to the installation space and flow requirements. For example, in areas with narrow drainage ditches or large flow rates, the filter surface can be set as an outwardly convex arc surface. Compared with a flat filter, the arc surface structure increases the filtration area, reduces the flow load per unit area, and reduces the frequency of clogging. In standard road sections or straight-walled drainage ditches, the filter surface can be set as a vertical plane to simplify the manufacturing process. The wire diameter can be made of 1.2mm or 1.5mm stainless steel wire to ensure that the filter does not deform or break under water flow impact and garbage accumulation. The bottom edge of the filter is kept at a distance of not less than 100mm from the bottom of the ditch, leaving sufficient sedimentation space for the bottom of the ditch. Even if a certain thickness of silt is deposited at the bottom of the ditch, it will not immediately submerge the bottom of the filter and affect the water intake.

[0036] Understandably, by strengthening the mechanical strength of the filter and optimizing its geometry, the structural stability of the filtration structure is ensured under harsh drainage conditions, preventing large foreign objects from entering the system due to filter damage. The suspended design at the bottom, combined with the sedimentation space at the bottom of the ditch, ensures that even if there is some siltation at the bottom of the ditch, the drainage channel remains unobstructed, guaranteeing the system's continuous drainage capacity.

[0037] In one feasible implementation, a water guide groove is provided on the side of the curb 201. The width of the water guide groove is 50mm to 100mm and the depth of the water guide groove is 30mm to 50mm. The water guide groove is connected to the notch 202.

[0038] In this technical solution, the specific dimensions of the drainage channel are determined according to the road drainage level. For example, on a typical sidewalk, the width of the drainage channel can be set to 50mm and the depth to 30mm to meet the collection needs of sidewalk runoff. On urban main roads with high traffic volume and rapid runoff, the width of the drainage channel can be set to 80mm or 100mm and the depth to 50mm to increase the inlet cross-section and quickly collect rainwater from the road surface. The cross-sectional shape of the drainage channel can be designed as U-shaped or trapezoidal. The U-shaped channel has a smooth bottom, low flow resistance, and is less prone to sediment accumulation; the trapezoidal channel has a large opening, which is beneficial for collecting surface water. Rainwater flows along the road cross slope towards the curb 201, collects in the drainage channel on the side, and then quickly flows along the channel to the opening 202 into the drainage ditch.

[0039] Understandably, the 201 irregular-shaped curb, combined with the design of the water guide channel, changes the traditional method of relying solely on manhole covers for water intake. It expands the water intake from a "point" to a "line," significantly increasing the contact area for rainwater collection and effectively solving the problem of road water accumulation. Especially in the early stages of heavy rain, it can quickly drain road runoff and ensure the safety of pedestrians and vehicles.

[0040] like Figure 1 As shown, in one feasible embodiment, a drainage slope 203 is provided at the bottom of the notch 202, and a grid strip is provided at the notch 202 of the curb 201.

[0041] In this technical solution, the slope of the drainage slope 203 can be specifically set to a gradient of 5% to 10%, guiding water flow to quickly fall into the ditch and preventing water from stagnating at the gap 202. The specific implementation of the grating strips can be cast iron grating strips or composite material grating strips. The gap width of the grating strips is controlled between 10mm and 20mm, which can both allow water flow and prevent large solid waste such as beverage bottles and wooden sticks from entering the gap 202. The grating strips are fixed at the gap 202 by pre-embedding or slotting, forming a whole with the curb 201. When rainwater carrying garbage rushes towards the gap 202, the grating strips perform preliminary coarse screening, intercepting large pieces of garbage on the roadside, while the water flows through the grating strips and accelerates into the ditch via the drainage slope 203.

[0042] Understandably, the drainage slope 203 eliminates the potential energy barrier for water flow into the drainage ditch, improving water intake efficiency; the bar screen, as a coarse filter, further enhances the system's anti-clogging capability, avoiding the problem of large garbage getting stuck in the gap 202 or entering the ditch body and being difficult to clean, thus ensuring the smooth flow of the drainage inlet.

[0043] In one feasible implementation, the drainage ditch structure 100 includes a ditch wall and a ditch bottom. The ditch bottom has a slope towards the water inlet. The height of the dust and sand level 101 is set so that the distance from the lowest point of the ditch bottom is not less than 50mm. A dust and sand buffer layer is provided at the bottom of the dust and sand level 101. This 50mm space is used to collect heavier particles such as mud, sand, and stones, isolating them from the drainage pipe above and preventing mud and sand from entering the pipe and causing siltation.

[0044] In this technical solution, the slope of the ditch bottom can be specifically set to 0.5% to 1%, relying on gravity to guide the water in the ditch to flow towards the drain outlet 102, preventing long-term water accumulation and the breeding of mosquitoes. The dust and sand buffer layer can specifically adopt a rough, uneven surface structure, or lay a layer of corrosion-resistant rough pad to increase the bottom friction, making it difficult for the settled silt particles to be stirred up again by the water flow. For example, the height of the dust and sand level 101 can be designed to be 100mm or 150mm below the lowest point of the ditch bottom, forming an independent sedimentation bucket structure. When the water flows over the dust and sand level 101, the flow velocity decreases due to the increased cross-sectional area, and the silt settles into the bottom buffer layer through the space below the drain pipe under the action of gravity, while the upper water is discharged from the drain pipe.

[0045] Understandably, the slope of the ditch bottom ensures the self-cleaning ability of the drainage and reduces siltation in the ditch; the independent and buffered dust and sand position 101 design significantly improves the efficiency of mud-water separation, locking the mud and sand in a specific area below the drainage pipe, preventing the mud and sand from moving around in the ditch with the water flow or entering the pipe, greatly reducing the frequency and difficulty of dredging operations, and ensuring the long-term stable operation of the system.

[0046] In one feasible implementation, the masonry materials for the trench walls and bottom include bricks, cement mortar plaster, and waterproof coating. The thickness of the cement mortar plaster is not less than 20 mm, and the waterproof coating is applied at least twice, with a thickness of not less than 1.5 mm.

[0047] In this technical solution, the bricks can be Mu10 grade sintered common bricks or solid concrete bricks, and the mortar strength grade should not be lower than M7.5 to ensure the structural strength of the trench. The cement mortar plaster thickness is specifically set at 20mm or 25mm, with a mix ratio of 1:2.5 or 1:3 to ensure the density and strength of the plaster layer. The waterproof coating can be polymer cement waterproof coating or polyurethane waterproof coating. The second coat can only be applied after the first coat has dried, and the total thickness is controlled between 1.5mm and 2.0mm to form a continuous and dense waterproof membrane. During construction, the brickwork forms the outline of the trench, the mortar plaster is used to level and seal the brick joints, and finally, the waterproof coating layer covers the entire inner wall to block the water penetration path.

[0048] Understandably, through strict material selection and multi-layered construction measures, rainwater in the drainage ditch is effectively prevented from seeping into the surrounding soil, protecting the dryness and stability of the roadbed and avoiding road collapse due to soil erosion. At the same time, the smooth and dense inner wall of the waterproof layer reduces water flow resistance, which not only improves the drainage speed but also reduces the possibility of siltation.

[0049] like Figures 1 to 3As shown, in one feasible embodiment, the rainwater drainage system further includes a covering structure 400, which includes a permeable cover plate 401, a fall arrest net 402, and a pebble layer 403. The permeable cover plate 401 is disposed on top of the drainage ditch structure 100, and the permeable cover plate 401 has an opening ratio of not less than 30% and a single hole size of not more than 50mm × 100mm. The fall arrest net 402 is disposed on top of the permeable cover plate 401, and the mesh size of the fall arrest net 402 is not more than 30mm × 30mm. The pebble layer 403 is disposed on top of the fall arrest net 402.

[0050] In this technical solution, the overlay structure 400 is key to achieving "invisibility" and "silence." It is configured from bottom to top as follows: 1) Finished composite resin grates: high strength, anti-theft, corrosion resistant, and load-bearing capacity of C250 grade or above, ensuring the safety of pedestrians and vehicles.

[0051] 2) Finished resin mesh: laid on top of the grate, with a mesh size of about 30mm×30mm, it plays a "connecting the upper and lower" role, allowing water to flow through while preventing pebbles above from falling into the drainage ditch and clogging the pipes.

[0052] 3) Scattered φ40~60mm matte-finish pebbles: This is the top decorative and permeable layer. The selection of pebbles with a specific particle size ensures a high porosity and permeability. The matte finish eliminates the reflective pollution of the pebbles, making them look natural, rustic, and coordinated with the surrounding paving.

[0053] Understandably, this multi-layered covering structure 400 abandons the exposed form of traditional metal manhole covers and achieves a perfect integration of drainage outlets and road landscape through the pebble layer 403, eliminating the problems of abnormal noise, vibration and reflection that exist with metal manhole covers, and creating a quiet and beautiful urban environment; at the same time, the upper pebble layer 403 plays a preliminary role in retaining and purifying rainwater, reducing the peak flow of surface runoff, and has certain sponge city benefits.

[0054] In one feasible implementation, the pebble layer 403 has a pebble particle size range of 40mm to 60mm, a Mohs hardness of not less than 6, a water absorption rate of not more than 2%, and the pebble is treated with acid washing and matte polishing.

[0055] In this technical solution, the pebble size is specifically controlled between 45mm and 55mm. Pebbles in this size range have good aesthetic appeal and, due to their larger size, are less likely to be washed away by water or get stuck in the pores of the fall-prevention net 402. The Mohs hardness is required to be no less than 6. Natural quartz river pebbles or machine-made pebbles can be used to ensure they do not break or pulverize when stepped on by pedestrians or occasionally run over by vehicles. The water absorption rate is no more than 2%, ensuring that the pebbles themselves do not absorb water and will not crack or weather due to freeze-thaw cycles. The acid washing process removes dust and impurities from the pebble surface, and the matte polishing treatment eliminates the specular reflection on the stone surface, giving it a matte texture. In daily use, the clean matte pebble layer 403 not only serves as decoration but also absorbs some of the oil stains on the road surface in rainy weather and is easy to remove for cleaning or replacement.

[0056] Understandably, by strictly limiting the physical properties and surface treatment of the pebbles, the durability and aesthetics of the covering layer in long-term outdoor environments are guaranteed, the problem of drainage pore blockage caused by the weathering and breakage of the pebbles is avoided, and the visual interference caused by road surface reflection and glare on rainy days to pedestrians and drivers is eliminated, thus improving road safety and comfort.

[0057] like Figure 5 As shown, according to a second aspect of the embodiments of this application, a method for implementing a rainwater drainage system is proposed, applied to a rainwater drainage system as described in any of the above technical solutions. The method for implementing the rainwater drainage system includes: Step 501: Excavate the foundation trench: Excavate the trench to the design elevation according to the design drawings, remove disturbed soil and debris from the bottom of the trench, and test the bearing capacity of the foundation to ≥150kPa.

[0058] The plain soil is backfilled in layers, with each layer having a loose thickness of 250-300mm. A 20-ton vibratory roller is used for two passes of static compaction, one pass of weak vibration, and one pass of strong vibration. Local corners are reinforced with a frog-type rammer.

[0059] After each layer is compacted, the compaction coefficient is tested using the ring cutter method, every 100m 2 Take at least 3 samples to ensure that the compaction coefficient is ≥0.9, and record the number of compaction passes and the moisture content curve. The moisture content should be controlled within the range of ±2% of the optimum moisture content.

[0060] A 100mm thick crushed stone pad layer is set at the bottom of the trench for leveling. The crushed stone has a particle size of 5-20mm and a compaction coefficient of ≥0.85.

[0061] Step 502: Pour the foundation layer on the foundation trench: On the compacted plain soil layer, set up formwork and pour a 100mm thick C15 plain concrete foundation layer. The concrete is pre-mixed commercial concrete with a slump of 120±20mm.

[0062] Use an immersion vibrator to compact the surface, and then use a scraper to level and a trowel to smooth the surface, ensuring that the flatness error is ≤5mm.

[0063] The subbase is covered with geotextile and moisturized by sprinkling water. The curing period is ≥7 days. The curing temperature and humidity are recorded daily. The compressive strength is ≥15MPa after 28 days.

[0064] Step 503: Arrange the drainage ditch structure on the subbase 100: Lay out the positioning lines on the subbase, and use MU10 sintered common bricks or solid concrete bricks, and M7.5 cement mortar to build the ditch walls and bottom, with a building height of ≤1.5m per day.

[0065] Implement the "three-in-one" bricklaying method: one trowel of mortar, one brick, one squeeze and knead, with a mortar joint thickness of 8-12mm and a fullness of ≥85%, and use a bricklaying gauge to control the elevation.

[0066] The bottom of the ditch should have a longitudinal slope of 0.3%-0.5% towards the inlet, with laser level control points set every 5m, and the slope deviation should be ≤0.05%.

[0067] A 50mm deep rectangular sedimentation trough is reserved at the lowest point of the trench. A 20mm thick M7.5 cement mortar is applied to the inner side of the trough wall, and the surface is smoothed. Then, two coats of polymer cement waterproof coating are applied, with a total thickness of ≥1.5mm, to form a waterproof layer.

[0068] Step 504: Arrange dust and sand positions 101 and install drainage pipes within the drainage ditch structure 100; lay a 20mm thick coarse sand leveling layer in the sedimentation tank, and fill the top with graded crushed stone with a compaction coefficient ≥0.85 to form a dust and sand buffer layer.

[0069] Install hot-dip galvanized steel pipe supports with a spacing of ≤1.5m. Weld steel plates to the bottom of the supports and anchor them to the bottom of the trench. Install rubber pads on the top.

[0070] Lay HDPE double-wall corrugated pipes or PVC-U drainage pipes with a diameter of DN200-DN300 and a ring stiffness ≥8kN / m. 2 The bottom of the pipe should be at least 50mm away from the dust and sand level.

[0071] The pipeline is connected by electrofusion, and a 100% airtightness test is performed at the joint. The pressure of 0.1MPa is maintained for 30 minutes without leakage. The end is connected to the municipal rainwater pipe network, and the joint is waterproof and sealed.

[0072] Step 505: Install curb 201 on the top inlet side of the drainage ditch structure 100; precast C30 concrete irregular curb 201, with a water guide channel size of 50-100mm wide and 30-50mm deep, milled by CNC machine tool, with a dimensional deviation of ±2mm.

[0073] The 201 curb is installed using the grouting method with a mortar thickness of 20mm. A φ10mm rubber waterstop strip is installed between the 201 curbs for caulking. The top drainage slope 203 has a slope of 2%-3%.

[0074] A 304 stainless steel filter screen with a hole diameter of 2-5mm and a wire diameter of ≥1.0mm is installed at the water inlet. The frame is reinforced with 30×30×3mm angle steel. The surface is sandblasted to Sa2.5 grade and then coated with epoxy zinc-rich primer.

[0075] The filter screen is fixed to the curb or the inner side of the trench wall with M8 stainless steel expansion bolts, with a spacing of ≤200mm, a bottom edge ≥100mm from the bottom of the trench, and a top edge not higher than the road surface elevation.

[0076] Step 506: Lay a covering structure 400 on top of the drainage ditch structure 100. Install glass fiber reinforced SMC composite resin grates with a load-bearing capacity ≥ C250 grade, an opening ratio ≥ 30%, and a single hole size ≤ 50mm × 100mm. Fill the gap between the grate and the ditch wall with elastic sealant.

[0077] HDPE or PP resin mesh is laid on top of the grate, with a mesh size of 30mm×30mm and an overlap width of ≥100mm. Hot-melt bonding is used, which involves heating to 180℃ to melt and bond the mesh.

[0078] Scattered 40-60mm matte-finish pebbles, gray, bluish-gray or beige in color, with a Mohs hardness ≥6 and a water absorption rate ≤2%. They are treated with acid washing and matte polishing, resulting in a non-glossy surface.

[0079] The pebbles are laid using the "dry laying method" with a thickness of 150mm and a porosity of 12%-15%. During laying, a level is used to control the surface flatness error to ≤5mm. Finally, a plate vibrator is used to lightly compact the surface to avoid damaging the matte layer.

[0080] The rainwater drainage system implementation method provided in this application embodiment, since it is applied to the rainwater drainage system of any of the above-described technical solutions, therefore the rainwater drainage system implementation method has all the beneficial effects of the rainwater drainage system of the above-described technical solutions.

[0081] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0082] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit 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 invention.

[0083] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. 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.

[0084] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rainwater drainage system, characterized in that, include: A drainage ditch structure, wherein a water inlet is provided at the top of the drainage ditch structure, and a dust and sand level and a drain outlet are provided at the bottom of the ditch, with the drain outlet located above the dust and sand level; A curb structure, the curb structure including a curb, the curb having a notch, the notch communicating with the water inlet; A filter structure is provided at the water inlet.

2. The rainwater drainage system according to claim 1, characterized in that, The filtering structure includes: A filter screen is disposed at the notch and is fixedly connected to the toothed surface. The pore size of the filter screen is 2mm to 5mm.

3. The rainwater drainage system according to claim 2, characterized in that, The diameter of the mesh wires of the filter screen is not less than 1 mm, the filter surface of the filter screen is set as an arc surface or a plane, the distance between the bottom edge of the filter screen and the bottom of the drainage ditch structure is not less than 100 mm, and the top edge of the filter screen is not higher than the curb.

4. The rainwater drainage system according to claim 1, characterized in that, A water guide groove is provided on the side of the curb. The width of the water guide groove is 50mm to 100mm and the depth of the water guide groove is 30mm to 50mm. The water guide groove is connected to the notch.

5. The rainwater drainage system according to claim 1, characterized in that, A drainage slope is provided at the bottom of the gap, and a grid strip is provided at the gap of the curb.

6. The rainwater drainage system according to claim 1, characterized in that, The drainage ditch structure includes: The ditch wall and the ditch bottom are provided with a slope towards the water inlet. The height of the dust and sand level is set so that the distance from the lowest point of the ditch bottom is not less than 50mm. A dust and sand buffer layer is provided at the bottom of the dust and sand level.

7. The rainwater drainage system according to claim 6, characterized in that, The masonry materials for the trench walls and the trench bottom include bricks, cement mortar plaster, and waterproof coating. The thickness of the cement mortar plaster is not less than 20 mm, and the waterproof coating is applied at least twice, with a thickness of not less than 1.5 mm.

8. The rainwater drainage system according to claim 1, characterized in that, It also includes an overlay structure, the overlay structure comprising: A permeable cover plate is provided on the top of the drainage ditch structure. The permeable cover plate has an opening ratio of not less than 30% and a single hole size of not more than 50mm × 100mm. A fall-prevention net is installed on top of the permeable cover plate, and the mesh size of the fall-prevention net is no greater than 30mm × 30mm; A pebble layer is placed on top of the fall protection net.

9. The rainwater drainage system according to claim 8, characterized in that, The pebble layer has pebbles with a particle size ranging from 40mm to 60mm, a Mohs hardness of not less than 6, a water absorption rate of not more than 2%, and the pebbles have undergone acid washing and matte polishing treatment.

10. A method for implementing a rainwater drainage system, characterized in that, Applied to any one of claims 1 to 9, the method for implementing the rainwater drainage system includes: Excavate the foundation trench; A cushion layer is poured onto the foundation trench; A drainage ditch structure is arranged on the cushion layer; Dust and sand storage areas and drainage pipes are arranged and installed within the drainage ditch structure. A curb is installed on the top inlet side of the drainage ditch structure; A covering structure is laid on top of the drainage ditch structure.

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