Drainage system for lattice grassed slope

Abstract

The utility model relates to the technical field of side slope protection, especially relates to a drainage system for lattice planting grass side slope, including precipitation well structure, drainage pipe structure, drainage ditch, and drainage system is used in combination with lattice planting grass side slope, through the space arrangement of the water pump of precipitation well, drainage flower pipe, soft water permeable pipe, intercepting ditch and drainage ditch collaborative work, realize the initiative and passive drainage of groundwater in the slope. The water inlet hole is arranged in the precipitation well, and active pumping is carried out through the water pump; The combination of drainage flower pipe and soft water permeable pipe forms double-channel drainage, which can effectively drain the groundwater in the slope to the slope surface; The intercepting ditch and the drainage ditch collect the water flow on the slope surface in time, can quickly guide the water flow on the slope surface into the drainage system, improve the overall drainage efficiency. Coarse sand inverse filter layer, geotextile effectively prevent the entry of soil and impurities, reduce the risk of drainage system blockage, reduce the maintenance cost, improve the shear bearing capacity of soil, thereby enhance the overall stability of side slope.

Description

Technical Field

[0001] This utility model relates to the field of slope protection technology, and in particular to a drainage system for trellis-planted grass slopes. Background Technology

[0002] Geocell-based grass slope protection is a common slope protection method. It is low-cost, easy to implement, and effectively prevents soil erosion while providing conditions for plant growth. Combining geocells and grass planting technology, it effectively protects slopes from water and wind erosion and provides a favorable ecological environment.

[0003] Slope drainage is a crucial step in ensuring slope stability and the normal operation of related engineering facilities. If groundwater within the slope cannot be drained in time, the accumulated water will soften the slope soil, reduce the soil's shear strength, increase the risk of landslides, and pose a significant safety hazard.

[0004] Existing grid-structured grass slopes generally lack drainage systems or only have simple drainage pipes. When the groundwater level within the slope is high and the water volume is large, especially on cohesive soil slopes due to their poor permeability, the slope is prone to instability due to prolonged water immersion. The simple drainage pipes also suffer from problems such as easy clogging, poor drainage effect, and poor stability.

[0005] Therefore, existing grid-structured grass slopes suffer from problems such as easy clogging, poor drainage, and poor stability. Utility Model Content

[0006] The purpose of this invention is to provide a drainage system for trellis grass slopes that can solve the technical problems of existing trellis grass slopes, such as easy clogging, poor drainage effect and poor stability.

[0007] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a drainage system for a trellis-covered grass slope, comprising a dewatering well structure, a drainage pipe structure, and a drainage ditch. The dewatering well structure is perpendicular to the slope crest and located at the rear of the trellis-covered grass slope, with inlet holes on its well walls. The drainage ditch is located at the bottom of the trellis-covered grass slope. The drainage pipe structure is positioned between the dewatering well structure and the trellis-covered grass slope, with one end connected to the slope. Part of the water on the trellis-covered grass slope flows down the slope surface into the drainage ditch, while the other part flows sequentially through the drainage pipe structure and the inlet holes on the well walls into the dewatering well structure. (This drainage system, used in conjunction with the trellis-covered grass slope, achieves active and passive drainage of groundwater within the slope through the coordinated spatial arrangement of the dewatering well pump, PVC drainage pipes, flexible permeable pipes, intercepting ditches, and drainage ditches.) As a preferred embodiment, the drainage pipe structure includes a drainage perforated pipe connected to the trellis-vegetated slope, a perforated geotextile covering the drainage perforated pipe, and a flexible permeable pipe installed inside the drainage perforated pipe. The drainage perforated pipe has drainage holes. (The drainage pipe structure is used to drain groundwater from the slope. The drainage perforated pipe should be laid at a slope of 3% to 5%, inclined towards the slope surface, and its length is determined by the actual design, extending approximately 20mm beyond the slope surface. The perforated geotextile covering the perforated pipe is used to prevent clogging. The flexible permeable pipe enhances water conductivity and compressive strength. The flexible permeable pipe consists of a high-carbon steel wire spiral skeleton (covered with PVC for corrosion protection), a non-woven fabric filter layer, and a polyester fiber outer layer. It is supported by spring steel rings to form a compressive strength structure, which can block sediment and quickly guide water into the pipe. The flexible permeable pipe is installed inside the drainage perforated pipe, and its length is the same as that of the drainage perforated pipe. The pipe wall of the flexible permeable pipe adopts a spiral skeleton design.) Furthermore, the flexible permeable pipe is composed of a high-carbon steel wire spiral skeleton, a non-woven filter layer, and a polyester fiber outer layer, and is supported by spring steel rings to form a pressure-resistant structure.

[0008] As a preferred embodiment, the drainage pipe structure consists of multiple sets arranged in parallel behind the lattice-vegetated slope.

[0009] As a preferred embodiment, the dewatering well structure includes a dewatering well, a geotextile wrapped around the well, a coarse sand filter layer disposed outside the geotextile, and clay disposed on top of the coarse sand filter layer. (The dewatering well structure is used to collect and pump groundwater. Inlet holes are formed in the well wall to allow groundwater to flow into the well. These inlet holes can be arranged in a staggered or rectangular pattern. The geotextile wrapped around the well is located on the outside of the dewatering well and is used to filter sediment. The coarse sand filter layer is disposed outside the geotextile wrapped around the well and is used for further filtration and to promote water flow. The clay is located on top of the coarse sand filter layer, with the same width as the coarse sand filter layer, and should be compacted for sealing and seepage prevention.) Furthermore, the well wall of the dewatering well is reinforced with double-layer bidirectional reinforcement and is a prefabricated structure.

[0010] As a preferred embodiment, the precipitation well structure consists of multiple sets, arranged in a single or double row in the horizontal direction behind the grid-structured grass-covered slope.

[0011] As a preferred embodiment, the slope also includes a drainage ditch, which is located at the top of the trellis-vegetated slope.

[0012] The beneficial effects of this utility model are: This invention provides a drainage system for trellis-planted grass slopes, which can improve the drainage effect and engineering stability of trellis-planted grass slopes, and solve the technical problems of poor drainage effect, easy blockage and poor stability of existing trellis-planted grass slopes.

[0013] Improved drainage efficiency: Water inlets are installed in the dewatering wells, and active pumping is used for drainage. The combination of PVC drainage pipes and flexible permeable pipes forms a dual-channel drainage system, effectively removing groundwater from the slope to the outside. Additionally, intercepting ditches and drainage ditches collect slope runoff promptly. Through the application of a well-designed drainage ditch system, slope runoff can be quickly channeled into the drainage system, improving overall drainage efficiency. These features collectively reduce water retention time and increase overall drainage speed, making it particularly suitable for high-water-level slopes and avoiding the insufficient flow problem of traditional simple drainage pipes.

[0014] Reduced maintenance costs: The filter layer, comprising a coarse sand filter layer and geotextile, effectively prevents the entry of soil and impurities, reducing the risk of drainage system blockage and lowering maintenance costs. The high permeability and strong tensile strength of the geotextile effectively block soil and impurities from entering the drainage pipes; the particle size design of the coarse sand filter layer further filters fine particles, preventing system blockage. The sealing effect of the clay reduces the intrusion of external sediment. These features reduce cleaning frequency and maintenance needs, lowering long-term maintenance costs, and are particularly suitable for cohesive soil slopes.

[0015] Enhancing slope stability: An effective drainage system reduces water accumulation within the slope, preventing the soil from being softened by groundwater soaking, thus increasing the soil's shear bearing capacity and overall slope stability. Dewatering wells lower the groundwater level within the slope, preventing long-term soil softening and thus improving the soil's shear bearing capacity; PVC drainage pipes and flexible permeable pipes reduce pore water pressure. These features directly reduce the risk of landslides and enhance overall slope stability, with particularly significant effects during the rainy season or in high-water-volume environments. Attached Figure Description

[0016] Figure 1 This is a top-view schematic diagram of the drainage system on a lattice-structured grass-covered slope; Figure 2 yes Figure 1 Schematic diagram of the cross section at point AA; Figure 3 yes Figure 2 Schematic diagram of the cross section at point BB.

[0017] Explanation of reference numerals in the attached figures: 1-Drainage well, 2-Coarse sand filter layer, 3-Inlet hole, 4-Well side geotextile, 5-Clay, 6-Drainage perforated pipe, 7-Perforated pipe geotextile, 8-Flexible permeable pipe, 9-Intercepting ditch, 10-Drainage ditch, 11-Grid grass-covered slope, L1 is the horizontal spacing of the drainage wells, L2 is the horizontal spacing of the drainage perforated pipes, H is the depth of the drainage well, H1 is the vertical spacing of the drainage perforated pipes, D1 is the inner diameter of the drainage well. Detailed Implementation

[0018] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] To address the problems of low reliability, poor drainage, easy blockage of drainage pipes, and poor slope stability in traditional grid-structured grass slopes that lack drainage systems or only have simple drainage pipes, especially when the groundwater level within the slope is high and the water volume is large, this utility model provides an improved drainage system. This drainage system improves drainage efficiency by incorporating multiple drainage devices, including dewatering wells, intercepting ditches, drainage ditches, PVC drainage pipes, and flexible permeable pipes. The coarse sand filter layer and geotextile function to filter soil and drain water, preventing the protected soil from seeping out with the seepage water while ensuring the smooth discharge of infiltrated water, achieving a drainage and pressure reduction effect. By lowering the groundwater level, it effectively prevents the soil within the slope from being soaked and softened by water, reducing its shear bearing capacity, thereby effectively enhancing slope stability and preventing slope instability.

[0022] This utility model relates to a drainage system for a lattice-shaped grassed slope, comprising a dewatering well structure, a drainage pipe structure, a intercepting ditch 9, and a drainage ditch 10. The dewatering well structure is perpendicular to the top of the slope and is located behind the lattice-shaped grassed slope 11, with an inlet hole 3 on the well wall. The intercepting ditch 9 is located at the top of the lattice-shaped grassed slope 11, and the drainage ditch 10 is located at the bottom of the lattice-shaped grassed slope 11. The drainage pipe structure is located between the dewatering well structure and the lattice-shaped grassed slope 11, with one end connected to the lattice-shaped grassed slope 11. Part of the water on the lattice-shaped grassed slope 11 flows down the slope surface into the drainage ditch 10, and the other part flows into the dewatering well structure through the drainage pipe structure and the inlet hole 3 on the well wall. The drainage system is used in conjunction with the grid-structured grass slope 11. Through the coordinated spatial arrangement of the dewatering well pump, PVC drainage pipe 6, flexible permeable pipe 8, intercepting ditch 9 and drainage ditch 10, the system achieves active and passive drainage of groundwater within the slope.

[0023] The drainage pipe structure includes a drainage perforated pipe 6 connected to the trellis-planted grass slope 11, a perforated pipe geotextile 7 wrapped around the drainage perforated pipe 6, and a flexible permeable pipe 8 installed inside the drainage perforated pipe 6. The drainage perforated pipe 6 is provided with drainage holes. The drainage pipe structure is used to drain groundwater from the slope. The drainage perforated pipe 6 should be laid at a slope of 3% to 5%, inclined towards the slope surface, and its length is determined by the actual design, extending approximately 20mm beyond the slope surface. The perforated pipe geotextile 7 wrapped around the perforated pipe is used to prevent clogging. The flexible permeable pipe 8 is used to enhance water conductivity and compressive strength. The flexible permeable pipe 8 is composed of a high-carbon steel wire spiral skeleton covered with PVC anti-corrosion, a non-woven fabric filter layer, and a polyester fiber outer layer. It is supported by spring steel rings to form a compressive strength structure, which can block silt and quickly guide water into the pipe. The flexible permeable pipe 8 is installed inside the drainage perforated pipe 6, and its length is the same as that of the drainage perforated pipe 6. The pipe wall of the flexible permeable pipe 8 adopts a spiral skeleton design. The drainage pipe structure consists of multiple sets, arranged in parallel behind the lattice-vegetated slope 11.

[0024] The dewatering well structure includes a dewatering well, a geotextile 4 wrapped around the well, a coarse sand filter layer 2 placed outside the geotextile 4, and clay 5 placed on top of the coarse sand filter layer 2. The dewatering well structure is used to collect and pump groundwater. Inlet holes 3 are located on the well wall to allow groundwater to flow into the well. The inlet holes 3 can be arranged in a staggered or rectangular pattern on the well wall. The geotextile wrapped around the well is located on the outside of the dewatering well and is used to filter sediment. The coarse sand filter layer 2 is placed outside the geotextile wrapped around the well and is used for further filtration and to promote water flow. The clay 5 is located on top of the coarse sand filter layer 2, with the same width as the coarse sand filter layer 2, and should be compacted for sealing and seepage prevention. The well wall of the dewatering well is double-layered and bidirectionally reinforced, and the well wall is a prefabricated structure. The dewatering well structure consists of multiple sets, arranged in single or double rows horizontally behind the grid-structured grass-covered slope 11.

[0025] Specifically, this utility model provides a drainage system for a grid-structured grass-covered slope, including a dewatering well, an inlet hole, geotextile wrapped around the well, a coarse sand filter layer, clay, a water interception ditch, a drainage ditch, a PVC drainage pipe, geotextile wrapped around the pipe, a flexible permeable pipe, and a grid-structured grass-covered slope.

[0026] The technical principle of the drainage system used on the slope is as follows: the water pump installed in the dewatering well can promptly extract the groundwater that seeps into the well from the slope; the PVC drainage pipe and flexible permeable pipe can discharge the groundwater in the slope to the outside of the slope; the intercepting ditch can collect the rainwater on the top of the slope and discharge it into the municipal pipe network to avoid rainwater erosion of the slope; and the drainage ditch can collect the water on the slope in a timely manner and discharge it into the municipal pipe network.

[0027] The aforementioned dewatering well 1 is located behind the trellis-covered grass slope 11 and is used to collect and pump groundwater. The diameter of the dewatering well should not be less than 1000mm, but should not be greater than 3000mm, to avoid difficulties in construction and excavation due to excessively large diameters. The wall thickness of the dewatering well should not be less than 250mm, and should be determined based on the stress calculation of the well wall. The depth of the dewatering well should be determined through hydraulic calculations, and its depth should extend 2000mm below the hydraulic gradient line of the slope, and should not be less than half the slope height. The dewatering well should be at least 5000mm from the top of the slope and located at least 1000m behind the PVC drainage pipe. The dewatering wells can be arranged in single or double rows along the slope in the horizontal direction, with a horizontal distance of not less than 8000mm, but not more than 15000mm. The spacing between dewatering wells and the design drawdown of the well water level should also be determined based on the flow rate and discharge capacity of a single well, combined with local experience. The concrete strength of the dewatering well should not be less than C30. The well wall should be double-layered and bidirectionally reinforced, with reinforcement not less than 14@200 (generally referring to reinforcement requirements where the spacing between steel bars should not exceed 200mm and the diameter of the steel bars should not be less than 14mm). The steel grade is generally HRB400. For ease of construction, the well wall of the dewatering well is generally precast, and the length of each section should not exceed 2000mm. The water pump in the dewatering well is existing technology and will not be described in detail in this utility model.

[0028] The water inlet 3 is located on the well wall of the dewatering well 1, allowing groundwater to flow into the dewatering well; it is generally circular, with a diameter of 50mm to 150mm. The water inlets on the well wall can be arranged in a staggered or rectangular pattern, with a spacing of 1000mm to 1500mm.

[0029] The geotextile 4 wrapped around the well side is located on the outside of the dewatering well 1 and is used to filter silt and sand. The specification can be 300~500g / m. 2The thickness should be 1.3~3.6mm, the tensile strength should not be less than 3.5KN / m, the elongation at break should not be less than 25%, and the vertical permeability coefficient should not be less than 10. -2 -10 -4 The speed is cm / s, and the number of wrapping layers should not be less than 3.

[0030] The coarse sand filter layer 2 is placed on the outside of the geotextile 4 wrapped around the well side to further filter and promote water flow. Its thickness is generally 200~500mm, the coarse sand particle size range is 0.5~5mm, and some small pebbles can also be mixed in.

[0031] The clay 5 is located on top of the coarse sand filter layer 2 and is used for sealing and seepage prevention; it is 200mm thick and has the same width as the coarse sand filter layer, and it should be compacted.

[0032] The intercepting ditch 9 is located at the top of the trellis-covered grass slope 11 to collect rainwater from the slope top and guide it to the municipal drainage network. It should be constructed of reinforced concrete or plain concrete with a concrete strength of C25. Brick or pebble-lined intercepting ditches are not permitted. The net width and net depth of the intercepting ditch should not be less than 400mm. The wall thickness of the intercepting ditch is generally 200mm, and a 100mm thick C20 plain concrete pad should be provided at the bottom, with each side extending 100mm wider than the intercepting ditch. A grating cover should be installed on the ditch surface. The intercepting ditch should be connected to the municipal drainage system.

[0033] The drainage ditch 10 is set at the bottom of the grid-structured grass slope 11 to collect slope water flow and guide it to the municipal pipe network; it is close to the toe of the slope and its relevant parameters and specifications are the same as those of the intercepting ditch.

[0034] The PVC drainage pipes 6 are installed within the slope of the trellis-vegetated slope 11, arranged at an angle to the slope, to drain groundwater from the slope. The diameter of the PVC drainage pipes 6 is 100-200mm, and the wall thickness can be 3-8mm. Drainage holes should be provided on the PVC drainage pipes; these holes can be round or square, with a diameter of 5mm and a spacing of 500mm. The horizontal spacing of the PVC drainage pipes is 3000-5000mm, and the longitudinal spacing is 1500-3000mm, which should be designed in detail according to the drainage volume. The PVC drainage pipes should be laid at a slope of 3%-5%, inclined towards the slope surface, and the length is determined by the actual design, extending approximately 20mm beyond the slope surface.

[0035] The geotextile 7 wrapped around the perforated pipe is wrapped around the outside of the PVC drainage perforated pipe 6 to prevent blockage; the geotextile 7 wrapped around the perforated pipe has the same parameters and specifications as the geotextile 4 wrapped around the well side, and the number of wrapping layers is 2.

[0036] The flexible permeable pipe 8 is installed inside the PVC drainage perforated pipe 6 to enhance water conductivity and pressure resistance. The flexible permeable pipe 8 consists of a high-carbon steel wire spiral skeleton (covered with PVC for corrosion protection), a non-woven fabric filter layer, and a polyester fiber outer layer. Supported by spring steel rings, it forms a pressure-resistant structure that can block sediment and quickly guide water into the pipe. The flexible permeable pipe is installed inside the drainage perforated pipe, and its length is the same as the drainage perforated pipe. The pipe wall of the flexible permeable pipe adopts a spiral skeleton design, requiring a compressive strength ≥10MPa and a tensile strength ≥1.0KN / cm. The diameter of the flexible permeable pipe can be 50~80mm.

[0037] The drainage system is used in conjunction with the grid-structured grass slope 11. Through the coordinated spatial arrangement of the water pump of the dewatering well 1, PVC drainage flower pipe 6, flexible permeable pipe 8, intercepting ditch 9 and drainage ditch 10, the system achieves active and passive drainage of groundwater within the slope.

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0039] Combination Figure 1 and Figure 2 First, construct the grid-structured grass-covered slope 11 according to the design drawings, and then construct the intercepting ditch 9 and drainage ditch 10 according to the drawings. Excavate the ditch trenches according to the corresponding ditch outlines. After the trench excavation is completed, conduct self-inspection and mutual inspection. Once qualified, promptly pour the plain concrete foundation layer. After the plain concrete foundation layer has initially set, install the formwork and pour the ditch concrete. Finally, install the grating cover plate for the ditch.

[0040] Drilling should be carried out on the back side of the trellis-vegetated slope 11 according to the diameters of dewatering well 1 and coarse sand filter layer 2. The wells should be drilled according to their designed location, number, and horizontal spacing L1. The inner diameter of the dewatering well is D1, and the well locations should avoid underground pipelines and structures. Mark the well locations on-site using a total station and sprinkle white lime as a marker. The well location deviation should not exceed 50 mm. If obstacles are encountered, the well location needs to be adjusted, remeasured, and recorded. Before drilling, check the performance of the drilling rig to ensure normal operation. Equip it with suitable drilling tools, such as alloy drill bits and drill rods. The verticality deviation of the drill rod should be less than 1%. Prepare the wall-protecting mud material. In cohesive soil areas, mud can be made from the original soil; in sandy soil areas, mud needs to be prepared artificially. The mud specific gravity should be controlled between 1.1 and 1.3. Level the drilling site and lay a steel plate or gravel cushion layer to ensure the drilling rig is placed stably. When installing the drilling rig, use a level to adjust the rig body to ensure the borehole is vertical. Start the drilling rig and begin drilling. Maintain mud circulation throughout the drilling process, ensuring the mud level is always 1-2 meters above the groundwater level. Adjust the drilling speed according to the soil properties; faster speeds are possible in clay layers, while slower speeds are needed in sand layers to avoid borehole collapse. Check the borehole verticality every 5 meters using an inclinometer; the verticality deviation should be controlled within 1%. After drilling to the designed dewatering well depth H, stop drilling and maintain mud circulation for 30 minutes to remove sediment from the bottom of the borehole, ensuring the sediment thickness does not exceed 200 mm.

[0041] According to the specific drawings, the well walls of the dewatering wells are prefabricated on the construction site, with water inlet holes 3 reserved on them, and geotextile 4 is wrapped around the well walls. After drilling is completed, the well walls can be hoisted into the well hole. The hoisting should be carried out sequentially, ensuring good connection between the two sections of the well wall. After all the well walls are hoisted into place, a coarse sand filter layer 2 can be filled into the gap between the well wall and the well hole. The filling can be stopped when it reaches 200mm below the ground surface, and the coarse sand filter layer 2 is sealed with clay 5.

[0042] Drilling is carried out on slope 11 according to the length, inclination, horizontal spacing L2, and vertical spacing H1 of the drainage pipes as determined by the design. Commonly used drilling machines include rotary, impact, and impact-rotary types. Before drilling, locate the hole position and mark it. After the drilling rig is in place, it should be kept stable, with the vertical shaft of the drilling rig aligned with the inclination angle of the anchor rod and on the same axis. Drilling can only begin after calibration with a compass. Bentonite should be prepared before drilling, and the drilling mud should be properly mixed to prevent hole collapse. During construction, mud pits and mud ditches should be dug to prevent mud from flowing freely. Keep the construction environment clean. Drilling parameters should be properly controlled, including: (a) drilling pressure; (b) drill rod speed; and (c) flushing fluid pump volume. During drilling, careful operation and concentration are required, and the drilling speed should be reasonably controlled to prevent various accidents such as drill bit burial and stuck drill bits. When drilling into loose strata, attention should be paid to adjusting the mud specific gravity and viscosity to prevent hole collapse. When mud slurry is ineffective for wall protection, casing must be used. After drilling is completed, the borehole should be cleaned with water promptly to remove the mud.

[0043] like Figure 1 , 3 As shown, after the drainage pipe 6 is wrapped with geotextile 7, a flexible permeable hose 8 can be inserted into it. After drilling is completed, the hose is inserted into the hole.

[0044] All other undescribed parts belong to the prior art. The above-described embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A drainage system for trellis-covered grass slopes, characterized in that: The structure includes a dewatering well structure, a drainage pipe structure, and a drainage ditch (10). The dewatering well structure is perpendicular to the top of the slope and is located behind the lattice grass-covered slope (11). The well wall of the dewatering well structure has an inlet hole (3). The drainage ditch (10) is located at the bottom of the lattice grass-covered slope (11). The drainage pipe structure is located between the dewatering well structure and the lattice grass-covered slope (11). One end of the drainage pipe structure is connected to the lattice grass-covered slope (11). Part of the water on the lattice grass-covered slope (11) flows down the slope into the drainage ditch (10), and the other part flows into the dewatering well structure through the drainage pipe structure and the inlet hole (3) on the well wall.

2. A drainage system for a trellis-covered grass slope according to claim 1, characterized in that: The drainage pipe structure includes a drainage flower pipe (6) connected to the grid-planted grass slope (11), a flower pipe geotextile (7) wrapped around the drainage flower pipe (6), and a soft permeable pipe (8) set inside the drainage flower pipe (6). The drainage flower pipe (6) is provided with drainage holes.

3. A drainage system for a trellis-covered grass slope according to claim 2, characterized in that: The flexible permeable pipe (8) is composed of a high-carbon steel wire spiral skeleton, a non-woven filter layer and a polyester fiber outer layer, and is supported by a spring steel ring to form a pressure-resistant structure.

4. A drainage system for a trellis-covered grass slope according to claim 3, characterized in that: The drainage pipe structure consists of multiple sets, arranged in parallel behind the lattice grass-covered slope (11).

5. A drainage system for a trellis-covered grass slope according to claim 1, characterized in that: The dewatering well structure includes a dewatering well (1), a well-side geotextile (4) wrapped around the dewatering well, a coarse sand filter layer (2) set outside the well-side geotextile (4), and clay (5) set on top of the coarse sand filter layer (2).

6. A drainage system for a trellis-covered grass slope according to claim 5, characterized in that: The well wall of the dewatering well is reinforced with double-layer bidirectional reinforcement and is a prefabricated structure.

7. A drainage system for a trellis-covered grass slope according to claim 6, characterized in that: The precipitation well structure consists of multiple groups, arranged in a single or double row in the horizontal direction behind the grid-structured grass-covered slope (11).

8. A drainage system for a trellis-covered grass slope according to any one of claims 1 to 7, characterized in that: It also includes a drainage ditch (9) which is located at the top of the lattice grass slope (11).

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