Rainwater guide and drainage system for closure construction of refuse landfill

Abstract

The utility model belongs to the technical field of refuse landfill closure, and provides a rainwater guide and drainage system for refuse landfill closure construction, which comprises a guide and drainage blind ditch arranged on the water incoming side of an anchoring ditch, and the guide and drainage blind ditch comprises a floral tube, a geotechnical filter screen and pebbles; the first end of the connecting pipeline is communicated with the floral pipe, and the second end of the connecting pipeline is communicated to the drainage pipe network. According to the rainwater guide and drainage system provided by the embodiment, the guide and drainage blind ditch is arranged on the incoming water side above the anchoring ditch and used for collecting rainwater, meanwhile, the floral tube is communicated with the drainage pipe network, and the overall on-film rainwater guide and drainage system is formed. In this way, rainwater does not flow into the anchoring groove but directly enters the drainage pipe network from the floral pipe, that is, sealing welding construction on the upper portion of the groove body does not need to be conducted after the anchoring groove is backfilled, cross construction of the seepage-proofing layer and backfilling soil of the anchoring groove can be avoided, and after construction of the seepage-proofing layer is completed, synchronous construction of the anchoring groove and soil covering on the film is achieved. Smooth guide and drainage of rainwater of the landfill are achieved, construction steps of closure are simplified, and the method has very high engineering guiding significance.

Description

Technical Field

[0001] This utility model belongs to the field of landfill closure technology, specifically relating to a rainwater drainage system for landfill closure construction. Background Technology

[0002] With the rapid increase in the amount of urban domestic waste, the environmental pollution and resource waste caused by traditional landfill disposal methods are becoming increasingly serious. In order to reduce the environmental impact of landfills and improve the recycling rate of land resources, my country is gradually promoting landfill closure projects, aiming to achieve waste reduction, resource recovery and harmless treatment through scientific management and technical means.

[0003] Landfill sealing engineering technologies mainly include landfill impermeable covering systems, rainwater drainage systems, leachate collection and treatment systems, and landfill gas collection and utilization systems. Among these, the impermeable covering system and the rainwater drainage system are crucial for controlling the generation and discharge of leachate. Traditional impermeable covering layer construction requires the installation of anchor trenches at the core impermeable layer. After clay backfilling into the anchor trenches, the upper part of the trench needs to be re-welded with an impermeable layer to achieve the trench's sealing effect, followed by the laying of the upper drainage network. This process is difficult and cumbersome due to the overlap between the impermeable layer laying and the anchor trench backfilling construction. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a rainwater drainage system for landfill closure construction, which solves the aforementioned problems and simplifies the closure construction process.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a rainwater drainage system for landfill closure construction, comprising:

[0006] A drainage blind ditch is installed on the water inlet side of the anchoring ditch. The drainage blind ditch includes a perforated pipe, a geotextile screen covering the outside of the perforated pipe, and pebbles filling the space between the perforated pipe and the geotextile screen.

[0007] A connecting pipe is provided, with its first end connected to the flower pipe and its second end connected to the drainage network.

[0008] Preferably, the geotextile filter is provided with a connection hole, and the second end of the connecting pipe extends through the connection hole to the outside of the geotextile filter and connects to the drainage pipe network.

[0009] Preferably, a fixing ring is fitted on the outside of the connecting pipe, and a pressure ring is slidably fitted on the outside of the connecting pipe. The pressure ring and the fixing ring are used to clamp the geotextile filter.

[0010] Preferably, the retaining ring is welded to the connecting pipe.

[0011] Preferably, the fixing ring is provided with an annular sealing gasket on the side facing the pressure ring.

[0012] Preferably, the fixing ring and the pressure ring are fixed together by bolts.

[0013] Preferably, the fixing ring has a threaded blind hole on the side facing the pressure ring, and the pressure ring has a through hole corresponding to the threaded blind hole. One end of the bolt passes through the through hole and is screwed into the threaded blind hole.

[0014] Preferably, the fixing ring is provided with a plurality of threaded blind holes evenly spaced along the circumference.

[0015] Preferably, the perforated tube is DN150-DN300.

[0016] Preferably, the connecting pipe is DN200-DN500.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This utility model provides a rainwater drainage system for landfill closure construction. It collects rainwater by installing a drainage blind ditch on the inflow side above the anchoring trench, while simultaneously connecting the perforated pipe to the drainage network, forming an integrated rainwater drainage system on the membrane. This prevents rainwater from flowing into the anchoring trench; instead, it directly enters the drainage network through the perforated pipe. This eliminates the need for sealing and welding above the trench after backfilling, avoiding overlap between the construction of the impermeable layer and the backfill soil of the anchoring trench. After the entire impermeable layer is completed, the anchoring trench and the cover soil on the membrane can be constructed simultaneously. This system achieves smooth rainwater drainage and simplifies the closure construction process, providing a solution for convenient rainwater drainage and closure construction of landfills, and has strong engineering guiding significance. Attached Figure Description

[0019] Figure 1 A cross-sectional schematic diagram of a rainwater drainage system for landfill closure construction provided in this embodiment of the present utility model;

[0020] Figure 2 A front view schematic diagram of the connection holes and related parts of a rainwater drainage system for landfill closure construction provided in an embodiment of this utility model;

[0021] Figure 3 A three-dimensional structural diagram of the connecting pipes and related parts of a rainwater drainage system for landfill closure construction provided for an embodiment of this utility model;

[0022] Figure 4This is a top view of the connecting pipes and related parts of a rainwater drainage system for landfill closure construction, provided as an embodiment of the present invention.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Anchoring trench; 2. Perforated pipe; 3. Pebbles; 4. Geotextile filter; 5. Connecting pipe; 6. Connecting hole; 7. Fixing ring; 8. Pressure ring; 9. Annular sealing gasket; 10. Through hole; 11. Threaded blind hole; 12. Bolt; 13. Garbage layer; 14. Ventilation layer; 15. Membrane layer; 16. Drainage layer; 17. Green soil layer. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments, so that those skilled in the art can more clearly understand the present invention.

[0026] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrally formed structures. Those skilled in the art can understand the specific meaning of these terms in this patent based on the specific circumstances.

[0027] Example 1

[0028] The landfill covers an area of ​​40,000 m². 2 The plan is to construct a green landscape park on the upper part of the site after the site closure construction is completed.

[0029] Among them, the raw waste was piled up to form waste layer 13, see Figure 1 Above the garbage layer 13, an air venting layer 14, a membrane layer 15, and a drainage layer 16 are laid in sequence to form an impermeable layer. Above the impermeable layer is a green soil layer 17.

[0030] The venting layer 14 is a composite geogrid for venting. The membrane layer 15 is an HDPE geomembrane with a thickness of 0.75-1.5mm and a double-textured surface. The drainage layer 16 is a composite geogrid for drainage. The waste layer 13 is equipped with an anchoring trench 1, which can enhance the stability of the impermeable layer above the waste layer 13. However, after the anchoring trench 1 is backfilled, its top needs to be re-welded and laid with an impermeable layer to prevent rainwater from flowing into the anchoring trench 1. This would result in the construction of the impermeable layer and the backfill soil of the anchoring trench overlapping.

[0031] To avoid the above problems, this embodiment provides a rainwater drainage system for landfill closure construction, including:

[0032] The drainage blind ditch is set on the water inlet side of the anchoring ditch 1. The drainage blind ditch includes a perforated pipe 2, a geotextile filter 4 covering the outside of the perforated pipe 2, and pebbles 3 filling the space between the perforated pipe 2 and the geotextile filter 4.

[0033] For example, see Figure 1 The right side of the anchoring trench 1 is the water inflow side. The drainage blind ditch is located above the drainage layer 16 and to the right of the anchoring trench 1. In the drainage blind ditch, the perforated pipe 2 is parallel to the anchoring trench 1. The perforated pipe 2 is a pipe with permeable holes on its surface used to collect rainwater. The geotextile filter 4 is arranged along the axial direction of the perforated pipe 2 and covers the outside of the perforated pipe 2. The geotextile filter 4 is a one-way permeable geotextile, which allows water to permeate only from the outside to the inside of the geotextile filter 4, while preventing the loss of soil particles. In other words, rainwater in the green soil layer 17 can pass through the geotextile filter 4 into its inner side and finally into the perforated pipe 2, but cannot exit from the geotextile filter 4. This prevents rainwater from upstream from entering the anchoring trench 1, eliminating the need to re-weld and lay an impermeable layer above the anchoring trench 1.

[0034] Connecting pipe 5, the first end of which is connected to flower pipe 2, and the second end of connecting pipe 5 is connected to the drainage pipe network.

[0035] For example, see Figure 1 The right end of the connecting pipe 5 is connected to the side wall of the flower pipe 2, and the left end of the connecting pipe 5 is connected to the drainage network. In this way, rainwater in the flower pipe 2 can enter the drainage network through the connecting pipe 5.

[0036] Based on the above structure, the rainwater drainage system provided in this embodiment collects rainwater by setting up a drainage blind ditch on the water inflow side above the anchoring trench 1, while the perforated pipe 2 is connected to the drainage network, forming an integrated membrane-based rainwater drainage system. This prevents rainwater from flowing into the anchoring trench 1, instead allowing it to directly enter the drainage network from the perforated pipe 2. This eliminates the need for sealing and welding above the trench after backfilling the anchoring trench 1, avoiding overlap between the construction of the impermeable layer and the backfill soil of the anchoring trench 1. After the completion of all impermeable layers (venting layer 14, membrane layer 15, drainage layer 16), the anchoring trench 1 and the backfill soil on top of the impermeable layers can be constructed simultaneously. This achieves smooth rainwater drainage in landfills and simplifies the closure construction process, providing a solution for the convenience of rainwater drainage and closure construction in landfills, and has strong engineering guiding significance.

[0037] In this embodiment, the geotextile filter 4 is provided with a connecting hole 6, and the second end of the connecting pipe 5 extends through the connecting hole 6 to the outside of the geotextile filter 4 and is connected to the drainage pipe network.

[0038] For example, see Figure 1-2 The geotextile filter 4 has a connecting hole 6 that is compatible with the connecting pipe 5. The connecting hole 6 is used for the connecting pipe 5 to enter and exit the inner and outer sides of the geotextile filter 4.

[0039] In this embodiment, the perforated tube 2 can be DN200-DN300.

[0040] The connecting pipe 5 can be DN200-DN500.

[0041] Example 2

[0042] In order to improve the sealing performance at the connection pipe 5 and the connection hole 6, in this embodiment, a fixing ring 7 is sleeved on the outside of the connection pipe 5, and a pressure ring 8 is slidably sleeved on the outside of the connection pipe 5. The pressure ring 8 and the fixing ring 7 are used to clamp the geotextile filter 4.

[0043] For example, see Figure 3 A fixing ring 7 is fixedly fitted on the outside of the connecting pipe 5, and a pressure ring 8 is slidably fitted on the outside of the connecting pipe 5. The pressure ring 8 and the fixing ring 7 are the same size, both larger than the size of the connecting hole 6. In use, the fixing ring 7 is placed inside the connecting hole 6, and the pressure ring 8 is placed outside the connecting hole 6. Then, the pressure ring 8 and the fixing ring 7 are clamped and fixed, thus clamping and fixing the geotextile filter 4 at the connecting hole 6. This improves the sealing performance between the connecting pipe 5 and the connecting hole 6, preventing rainwater from flowing out from the gap between the connecting hole 6 and the connecting pipe 5.

[0044] The retaining ring 7 can be welded to the connecting pipe 5. The welding stability is high.

[0045] In order to improve the sealing performance between the fixing ring 7 and the pressure ring 8, in this embodiment, the fixing ring 7 is provided with an annular sealing gasket 9 on the side facing the pressure ring 8.

[0046] For example, see Figure 3-4 An annular sealing gasket 9 is provided on the left side wall of the fixed ring 7. When the pressure ring 8 is clamped with the fixed ring 7, the geotextile filter 4 is held between the annular sealing gasket 9 and the pressure ring 8, which can improve the sealing performance between the fixed ring 7 and the pressure ring 8.

[0047] In this embodiment, the fixing ring 7 can be fixed to the pressure ring 8 by bolts 12.

[0048] Specifically, the fixing ring 7 has a threaded blind hole 11 on the side facing the pressure ring 8, and the pressure ring 8 has a through hole 10 corresponding to the threaded blind hole 11. One end of the bolt 12 passes through the through hole 10 and is screwed into the threaded blind hole 11.

[0049] For example, see Figure 4 The upper surface of the fixing ring 7 is provided with a threaded blind hole 11, and the pressure ring 8 is provided with through holes 10 running vertically through it, with the through holes 10 aligned with the threaded blind hole 11. Thus, by threading the bottom end of the bolt 12 through the through hole 10 and into the threaded blind hole 11, the fixing ring 7 and the pressure ring 8 can be locked and fixed, thereby clamping the geotextile screen 4 at the connection hole 6. Furthermore, the threaded blind hole 11 can prevent new gaps from appearing at the bolt connection.

[0050] The fixing ring 7 has multiple threaded blind holes 11 evenly spaced along its circumference. The more threaded blind holes 11 there are, the more corresponding through holes 10 and bolts 12 there are, and the more stable the fixing ring 7 and the pressure ring 8 are. In addition, the radius of the circle containing the threaded blind holes 11 is smaller than the radius of the connecting hole 6, which can prevent the bolts 12 from interfering with the geotextile filter 4.

[0051] The mechanisms, components, and parts in this invention that are not specifically described are all existing structures in the prior art and can be purchased directly from the market.

[0052] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0053] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A rainwater drainage system for landfill closure construction, characterized in that, include: A drainage blind ditch is set on the water inlet side of the anchoring ditch (1). The drainage blind ditch includes a perforated pipe (2), a geotextile filter (4) covering the outside of the perforated pipe (2), and pebbles (3) filling the space between the perforated pipe (2) and the geotextile filter (4). The connecting pipe (5) has its first end connected to the flower pipe (2) and its second end connected to the drainage pipe network.

2. The rainwater drainage system for landfill closure construction according to claim 1, characterized in that, The geotextile filter (4) has a connecting hole (6), and the second end of the connecting pipe (5) extends through the connecting hole (6) to the outside of the geotextile filter (4) and connects to the drainage network.

3. A rainwater drainage system for landfill closure construction according to claim 2, characterized in that, A fixing ring (7) is fitted on the outside of the connecting pipe (5), and a pressure ring (8) is slidably fitted on the outside of the connecting pipe (5). The pressure ring (8) and the fixing ring (7) are used to clamp the geotextile filter (4).

4. A rainwater drainage system for landfill closure construction according to claim 3, characterized in that, The fixing ring (7) is welded and fixed to the connecting pipe (5).

5. A rainwater drainage system for landfill closure construction according to claim 3, characterized in that, The fixing ring (7) is provided with an annular sealing gasket (9) on the side facing the pressure ring (8).

6. A rainwater drainage system for landfill closure construction according to claim 3, characterized in that, The fixing ring (7) and the pressure ring (8) are fixed by bolts (12).

7. A rainwater drainage system for landfill closure construction according to claim 6, characterized in that, The fixing ring (7) has a threaded blind hole (11) on the side facing the pressure ring (8), and the pressure ring (8) has a through hole (10) corresponding to the threaded blind hole (11). One end of the bolt (12) passes through the through hole (10) and is screwed into the threaded blind hole (11).

8. A rainwater drainage system for landfill closure construction according to claim 7, characterized in that, The fixing ring (7) is provided with a plurality of threaded blind holes (11) evenly spaced along the circumference.

9. A rainwater drainage system for landfill closure construction according to claim 1, characterized in that, The flower tube (2) is DN150-DN300.

10. A rainwater drainage system for landfill closure construction according to claim 1, characterized in that, The connecting pipe (5) is DN200-DN500.

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