Garden green land ecological water intercepting ditch

Abstract

The utility model relates to a kind of garden green ecological water interception ditch, is set in the green slope foot of slow lane side, including the U-shaped ditch body extending along topographic contour line, the ditch bottom of U-shaped ditch body forms 0.35%-0.45% drainage slope from high to low and is communicated with rainwater pipe network;The ditch bottom of U-shaped ditch body is sequentially laid geotextile filter layer and the pebble seepage layer of gradient distribution of particle size, and the grass skin protection layer of the slope surface planting root system and geotextile anchoring is formed on the outer side of ditch wall;The top of U-shaped ditch body is higher than the edge of slow lane 6-8cm, and opening width is 30-50cm;The present application solves the problems such as low filtering efficiency, pipe network easy to block, poor slope stability of traditional water interception ditch by gradient filtration, accurate parameter adaptation and functional structure design, realizes the efficient purification, seepage and ecological supply of rainwater, and has the functions of drainage and flood control and landscape integration.

Description

Technical Field

[0001] This utility model belongs to the technical field of landscape engineering and municipal infrastructure, and specifically relates to an ecological intercepting ditch for garden green spaces. Background Technology

[0002] With the promotion of the sponge city concept in the process of urbanization, ecological intercepting ditches in parks and green spaces, as important facilities for realizing the "infiltration, retention, storage and purification" of rainwater, are widely used in rainwater management in areas such as pedestrian walkways and slopes.

[0003] Existing technologies, such as traditional ecological intercepting ditches, have several defects and shortcomings: the single-size pebble layer results in low filtration efficiency and easy blockage of seepage channels; geotextiles lack effective anchoring and are prone to displacement and wrinkling under rainwater erosion; the drainage slope follows the minimum standard of the specification and is not optimized for the narrow green space slope toe scenario next to the slow lane, resulting in drainage and seepage balance problems; at the same time, the lack of pre-treatment structure at the connection between the ditch and the pipe network makes the pipe network prone to blockage; the turf on the slope and the ditch do not form a cooperative anchorage, which makes the slope prone to collapse under heavy rain and poses a risk of rainwater backflow into the slow lane.

[0004] Based on the existing technology described above, this utility model proposes an ecological intercepting ditch for garden green spaces to at least partially solve the aforementioned problems. Utility Model Content

[0005] To address the aforementioned problems in existing technologies, this utility model provides an ecological intercepting ditch for gardens and green spaces. This solves the problems of poor filtration and seepage efficiency caused by the single-size pebble layer and insufficient geotextile anchoring in existing traditional ecological intercepting ditches. Furthermore, the drainage slope is not adapted to narrow green space scenarios, and the lack of pre-treatment structures at pipe network connections leads to a high risk of blockage. Additionally, the lack of coordinated anchoring between turf and the ditch body poses risks of slope collapse and rainwater backflow into pedestrian walkways.

[0006] The purpose of this utility model can be achieved through the following technical solution: an ecological intercepting ditch for garden green spaces, set at the foot of the green slope next to the pedestrian walkway, including a U-shaped ditch extending along the topographic contour line, wherein the bottom of the U-shaped ditch forms a drainage slope of 0.35%-0.45% from high to low and is connected to the rainwater pipe network; the bottom of the U-shaped ditch is successively laid with a geotextile filter layer and a pebble permeation layer with a gradient particle size distribution, and the outer slope of the ditch wall is planted with a turf protection layer with roots anchored to the geotextile; the top of the U-shaped ditch is 6-8cm higher than the edge of the pedestrian walkway, and the opening width is 30-50cm.

[0007] As a preferred technical solution of this utility model, the geotextile filter layer is folded upward along the edge of the ditch bottom to form a 5-8cm reverse wrapping structure, and is anchored to the outer slope of the ditch wall by the geotextile.

[0008] As a preferred technical solution of this utility model, the pebble seepage layer is composed of pebbles with an upper particle size of 3-5cm and a lower particle size of 5-8cm, forming a double-layer gradation structure, and the top surface of the seepage layer is 12-15cm lower than the top of the trench, forming a buffer space.

[0009] As a preferred technical solution of this utility model, a stepped sedimentation zone is provided at the connection between the U-shaped ditch and the rainwater pipe network. The sedimentation zone has a length of 1-1.5m and a depth of 10-15cm deeper than the bottom of the ditch.

[0010] As a preferred technical solution of this utility model, a replaceable filter sand layer is provided at the bottom of the sedimentation zone to intercept silt and prevent pipe network blockage.

[0011] As a preferred technical solution of this utility model, the inner wall of the U-shaped ditch is provided with at least one set of guide channels extending along the water flow direction. The depth of the guide channels is 2-3cm and the width is 5-8cm. At least one set of seepage micropores with a diameter of 1-2mm is provided at the bottom of the guide channels to guide rainwater to seep in laterally.

[0012] The beneficial effects of this utility model are as follows: The U-shaped ditch extending along the topographic contour lines and the 0.35%-0.45% drainage slope design achieve efficient interception and smooth discharge of rainwater from pedestrian walkways, preventing flooding during the rainy season; the geotextile filter layer at the bottom of the ditch and the double-layer graded pebble permeation layer form a multi-stage filtration system, improving rainwater purification; the buffer space between the top surface of the permeation layer and the top of the ditch reduces water flow impact; the turf protection layer on the ditch wall, through root anchoring with the geotextile and the geotextile reverse wrapping structure, enhances slope stability, preventing collapse and geotextile displacement caused by rainwater erosion; the stepped sedimentation zone and replaceable filter sand layer at the connection with the rainwater pipe network effectively intercept sediment, prevent pipe network blockage, and reduce maintenance costs; the inner wall diversion channel and permeable micropores guide rainwater to infiltrate laterally into the green space, strengthening the ecological replenishment function of rainwater. The overall solution combines multiple benefits of drainage and flood control, ecological purification, structural stability, and landscape integration, and is suitable for refined rainwater management at the foot of green slopes beside pedestrian walkways. Attached Figure Description

[0013] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic cross-sectional view of the main structure of this utility model; Figure 2 This is a schematic diagram of the main structure of this utility model.

[0015] In the diagram: 100, U-shaped ditch; 200, geotextile filter layer; 300, pebble seepage layer; 400, turf protection layer; 500, sedimentation zone; 600, diversion channel. Detailed Implementation

[0016] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0017] Please see Figure 1-2 This embodiment provides an ecological intercepting ditch for garden green spaces, located at the foot of a green slope beside a pedestrian walkway. It includes a U-shaped ditch 100 extending from the topographic contour lines. The bottom of the U-shaped ditch 100 forms a drainage slope of 0.35%-0.45% from high to low and is connected to a water pipe network. This invention limits the drainage slope of the U-shaped ditch to 0.35%-0.45% primarily based on two considerations: firstly, balancing drainage efficiency and infiltration time, this slope range allows the water flow velocity to be maintained at 0.2-0.3 m / s. The laminar flow state ensures smooth drainage in the pedestrian walkway area while allowing rainwater to remain in the ditch for 15-20 seconds, meeting the multi-stage filtration and infiltration needs of the geotextile and pebble layer. This avoids water accumulation due to excessively low slopes or reduced infiltration efficiency due to excessively high slopes. Secondly, it is suitable for the toe terrain of narrow green spaces. This slope has a high degree of conformity with gentle slope terrain, which can reduce earthwork excavation and protect the root system of vegetation. At the same time, it avoids the problems of ditch erosion and pebble layer displacement caused by traditional slopes of more than 0.5%. Combined with the geotextile reverse wrapping anchoring structure, it improves the stability of the slope.

[0018] Meanwhile, a stepped sedimentation zone 500 is set at the connection between the aforementioned U-shaped ditch 100 and the rainwater pipe network. This sedimentation zone 500 is 1-1.5m long and 10-15cm deeper than the ditch bottom. A replaceable filter sand layer is installed at the bottom of the sedimentation zone 500 to intercept sediment and prevent pipe network blockage. The stepped sedimentation zone 500 and the replaceable filter sand layer at the connection between the U-shaped ditch 100 and the rainwater pipe network create a localized low-lying space, allowing sediment to settle naturally by gravity. Combined with depth and water flow velocity, this improves... The sedimentation efficiency is high; the length ensures that rainwater stays briefly, adapting to narrow green spaces and buffering water flow; the filter sand layer uses quartz sand or ceramsite, pebble layer, and geotextile to form a three-stage filtration system. This filter sand layer is replaceable and fixed by slots; the stepped sedimentation zone 500 and replaceable filter sand layer composite structure of this embodiment overcome the defects of traditional direct connection interface. Through gravity sedimentation and fine filtration composite mechanism, parameter optimization compact design and modular maintenance, it achieves an upgrade from passive drainage to active purification, significantly improving the long-term operational reliability of the intercepting ditch.

[0019] In addition, the interior of the U-shaped ditch 100 is provided with at least one set of guide channels 600 extending along the water flow direction. The guide channels 600 are 2-3 cm deep and 5-8 cm wide, and the bottom of the guide channels 600 is provided with at least one set of permeable micropores with a diameter of 1-2 mm to guide the lateral infiltration of rainwater. Specifically, the guide channels 600 extend along the water flow direction, and the depth of 2-3 cm and the width of 5-8 cm form a specific guide space. On the one hand, this can change the flow direction of rainwater in the ditch and slow down the flow velocity of rainwater in the ditch, so that the rainwater has more time to fully contact the geotextile filter layer 200 and the pebble permeation layer 300 at the bottom of the ditch, thereby improving the infiltration effect. On the other hand, the ditch structure can guide the water flow to be evenly distributed, avoiding erosion caused by local water flow concentration. In this embodiment, the combination of the guide channel 600 inside the U-shaped ditch and the 1-2mm seepage micropores at the bottom improves the seepage effect by changing the direction of rainwater flow and slowing down the flow rate. The micropores enable lateral infiltration of rainwater, enhance the ecological water replenishment function for the surrounding green areas, and effectively make up for the shortcomings of the traditional intercepting ditch drainage mode, which is simple and lacks ecological function.

[0020] In this embodiment, the bottom of the U-shaped ditch 100 is sequentially laid with a geotextile filter layer 200 and a gravel permeation layer 300 with a gradient particle size distribution; and the outer slope of the ditch wall is planted with a turf protection layer 400 with roots anchored to the geotextile; the top of the U-shaped ditch 100 is 6-8cm higher than the edge of the slow lane, and the opening width is 30-50cm; the bottom of the U-shaped ditch 100 achieves multiple functions such as rainwater infiltration, slope protection, prevention of rainwater backflow into the slow lane, and ensuring drainage efficiency through the buffer seepage combination of the geotextile filter layer 200 and the gradient gravel permeation layer 300, and the anchoring protection structure of the turf and geotextile on the ditch wall, taking into account both practicality and ecology.

[0021] The pebble infiltration layer 300 consists of an upper layer of pebbles with a diameter of 3-5 cm and a lower layer with a diameter of 5-8 cm, forming a two-layer gradation structure. The top surface of the infiltration layer is 12-15 cm lower than the top of the ditch, creating a buffer space. Specifically, the upper 3-5 cm pebbles have relatively small pores, effectively intercepting impurities such as fallen leaves and gravel in rainwater, providing initial filtration. The lower 5-8 cm pebbles, with their larger pores, provide an efficient channel for rainwater infiltration, ensuring smooth water flow. The buffer space 12-15 cm lower than the top of the ditch serves two purposes: firstly, it temporarily stores excess rainwater during heavy rain, preventing overflow into pedestrian walkways and ensuring pedestrian safety; secondly, it provides space for the root growth of turf on the slope, promoting synergistic reinforcement of the slope by the turf and the infiltration layer. Together, these elements achieve graded filtration and rapid infiltration of rainwater, enhance the intercepting ditch's ability to cope with extreme rainfall, and combine ecological purification with practical protective functions.

[0022] Furthermore, the geotextile filter layer 200 is folded upwards along the bottom edge of the ditch to form a 5-8cm reverse wrapping structure, and is anchored to the outer slope of the ditch wall by the geotextile.

[0023] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An ecological intercepting ditch for garden green spaces, located at the foot of a green slope beside a pedestrian walkway, characterized in that, The system includes a U-shaped ditch extending along the topographic contour lines. The bottom of the U-shaped ditch has a drainage slope of 0.35%-0.45% from high to low and is connected to the rainwater pipe network. The bottom of the U-shaped ditch is successively laid with a geotextile filter layer and a pebble permeability layer with a gradient particle size distribution. The outer slope of the ditch wall is planted with a turf protection layer with roots anchored to the geotextile. The top of the U-shaped ditch is 6-8cm higher than the edge of the slow lane, and the opening width is 30-50cm.

2. The ecological intercepting ditch for garden green spaces according to claim 1, characterized in that, The geotextile filter layer is folded upwards along the bottom edge of the ditch to form a 5-8cm reverse wrap structure, and is anchored to the outer slope of the ditch wall by the geotextile.

3. The ecological intercepting ditch for garden green spaces according to claim 1, characterized in that, The pebble seepage layer consists of an upper layer of pebbles with a particle size of 3-5 cm and a lower layer with a particle size of 5-8 cm, forming a double-layer gradation structure. The top surface of the seepage layer is 12-15 cm lower than the top of the trench, forming a buffer space.

4. The ecological intercepting ditch for garden green spaces according to claim 1, characterized in that, A stepped sedimentation zone is set at the connection between the U-shaped ditch and the rainwater pipe network. The sedimentation zone is 1-1.5m long and 10-15cm deeper than the bottom of the ditch.

5. The ecological intercepting ditch for garden green spaces according to claim 4, characterized in that, A replaceable filter sand layer is provided at the bottom of the sedimentation zone to intercept silt and prevent pipe network blockage.

6. The ecological intercepting ditch for garden green spaces according to claim 1, characterized in that, The inner wall of the U-shaped ditch is provided with at least one set of guide channels extending along the water flow direction. The guide channels are 2-3cm deep and 5-8cm wide, and the bottom of the guide channels is provided with at least one set of seepage micropores with a diameter of 1-2mm to guide rainwater to seep in laterally.

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