Drainage structure for sealing flexible landfill

Abstract

The utility model relates to the technical field of landfill drainage, and discloses a drainage structure for flexible landfill closure, which comprises a drainage ditch and a drainage net, the drainage net is arranged between a drainage layer and an impermeable layer, and after one part of the drainage net on an upper slope of the closure structure is broken along the horizontal direction, the drainage ditch is closed. The edge of the drainage pipe penetrates through the drainage layer, leads to the position between the drainage layer and the greening soil layer and is connected with the side wall of the drainage ditch. The drainage structure solves the technical problems that accumulated water in a drainage structure in the prior art flows into a drainage ditch slowly, so that the accumulated water possibly remains or is accumulated in a greening soil layer, finally, a large amount of accumulated water is accumulated below the greening soil layer, the stability of the greening soil layer is reduced, and accidents such as landslide are likely to happen.

Description

Technical Field

[0001] This utility model relates to the field of landfill drainage technology, specifically a drainage structure for flexible landfills. Background Technology

[0002] In existing technology, sanitary landfills are classified into five levels: Level 1 landfills are inert waste landfills or stockpiles; Level 2 landfills are mining waste disposal sites; Level 3 landfills are municipal solid waste sanitary landfills; Level 4 landfills are industrial waste landfills; and Level 5 landfills are also known as hazardous waste safe landfills. If a landfill has been in use for too long or its capacity has reached a certain limit, it needs to be closed.

[0003] A sanitary landfill closure structure typically consists of an air-conducting layer, an impermeable layer, a drainage layer, and a green soil layer. The drainage layer generally uses a composite drainage network of gravel and geotextile, and the green soil layer is no less than 500mm thick. To facilitate the drainage of rainfall after landfill closure, drainage ditches are usually installed on the surface of the landfill closure and in the green soil layer of the closure structure.

[0004] The attached diagram of the instruction manual Figure 1 This diagram illustrates an embodiment of a drainage ditch and enclosure structure in the prior art. The enclosure structure, from bottom to top, consists of a stockpile, an impermeable layer, a drainage net, a drainage layer, and a greening soil layer. The connection relationship between the drainage ditch and the enclosure structure is shown below. Figure 1 As shown, drainage ditches are generally constructed using brick or mortar-grouted stone masonry and are located at the bottom of each slope layer. The top of the drainage ditch is roughly flush with the surface of the green soil layer, and the ditch walls extend downwards from the surface into the drainage layer. The drainage net continues along the surface of the impermeable layer. Therefore, current practices often fail to effectively connect the drainage ditch with the drainage structure within the enclosure structure. This results in slow water flow from the enclosure drainage structure into the drainage ditch, potentially causing water to stagnate or accumulate in the surface green soil layer. Ultimately, this accumulation of water beneath the green soil layer can destabilize the green soil layer and even lead to landslides or other accidents. Utility Model Content

[0005] To address the technical problem in existing technologies where the drainage ditch is not effectively connected to the drainage structure in the landfill enclosure, resulting in slow water flow into the drainage ditch and potential landslide hazards, this invention proposes a drainage structure for flexible landfill enclosures.

[0006] The drainage structure used for flexible landfill closure includes, from bottom to top, an impermeable layer, a drainage layer, and a green soil layer. The drainage structure also includes drainage ditches and a drainage net. The drainage ditch is located at the bottom of the upper slope of the closure structure, and the drainage net is located between the drainage layer and the impermeable layer. Near the drainage ditch, the drainage net passes through the drainage layer in the thickness direction of the closure structure, then adheres to the green soil layer and connects with the sidewall of the drainage ditch. At least two drainage pipes are installed on the side wall of the drainage ditch facing the bottom of the upper slope of the closure structure. The inlets of the drainage pipes face the upper slope of the closure structure and are located close to the upper surface of the drainage net. The outlets of the drainage pipes lead into the drainage ditch. The structure also includes a filter and anti-clogging mechanism, which is laid above the drainage net on the outer side of the ditch wall and below the upper surface of the green soil layer. The inlets of the drainage pipes are located within the filter and anti-clogging mechanism.

[0007] The drainage structure used for the closure of the flexible landfill has a filter and anti-clogging structure consisting of a geonet wrapped around a pile of gravel, and the filter and anti-clogging structure covers the part of the drainage pipe located on the outside of the ditch wall.

[0008] The drainage structure used for the closure of flexible landfills described above has a portion of the drainage pipe located outside the trench wall wrapped with geonet, and a filter and anti-clogging structure wrapped around the outside of the geonet.

[0009] The drainage structure used for the closure of flexible landfills described above has a filter and anti-clogging structure with a thickness greater than the outer diameter of the drainage pipe and a width more than twice the outer diameter of the drainage pipe.

[0010] The drainage structure used for the closure of the flexible landfill has a drainage net box located directly below the drainage ditch. The upper slope of the closure structure extends beyond the drainage ditch to the ditch wall on one side of the upper slope of the closure structure.

[0011] The beneficial effects of this utility model include: by setting a drainage pipe that penetrates the wall of the drainage ditch and setting a filter and anti-clogging structure, the effective connection between the drainage ditch and the drainage layer in the enclosure structure is realized. At the same time, it solves the technical problem that the efficiency of water flowing into the drainage ditch in the drainage structure of the existing technical solution is slow, which may lead to water stagnation or accumulation in the surface green soil layer, and ultimately cause instability of the green soil layer and landslides due to the accumulation of a large amount of water under the green soil layer. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of an embodiment of the connection method between drainage ditch and enclosure structure in the prior art.

[0013] Figure 2 This is a schematic diagram of the drainage structure of the present invention used for the closure of flexible landfills.

[0014] Figure 3 This is a cross-sectional view of the drainage structure and anti-clogging mechanism for flexible landfill closure according to this utility model.

[0015] The markings in the diagram are: 1-drainage ditch, 2-drainage net, 3-drainage pipe, 4-filter and anti-clogging structure, 5-drainage layer, 6-green soil layer, 7-mound body, 8-seepage barrier layer. Detailed Implementation

[0016] The present invention will now be described in conjunction with the accompanying drawings.

[0017] like Figures 2-3 As shown, the drainage structure for flexible landfill closure of this utility model includes, from bottom to top, an impermeable layer 8, a drainage layer 5, and a green soil layer 6. The drainage structure also includes a drainage ditch 1 and a drainage net 2. The drainage ditch 1 is located at the bottom of the upper slope of the closure structure. The drainage net 2 is located between the drainage layer 5 and the impermeable layer 8. Near the drainage ditch 1, the drainage net 2 passes through the drainage layer 5 in the thickness direction of the closure structure and then adheres to the green soil layer 6, connecting with the side wall of the drainage ditch 1. At least two drainage pipes 3 are installed on the side wall of the drainage ditch 1 facing the bottom of the upper slope of the closure, penetrating the ditch wall. The inlets of the drainage pipes 3 face the upper slope of the closure structure and are located close to the upper surface of the drainage net 2. The outlets of the drainage pipes 3 lead into the drainage ditch 1. The structure also includes a filter and anti-clogging structure 4, which is laid or spaced above the drainage net 2 on the outside of the ditch wall and below the upper surface of the green soil layer 6. The inlets of the drainage pipes 3 are located within the filter and anti-clogging structure 4. Figure 3 As shown, the filter and anti-clogging structure 4 described in this embodiment is laid on the drainage net 2. However, the filter and anti-clogging structure 4 can also be wrapped only around the inlet of the drainage pipe 3 and spaced apart on the drainage net 2, producing the same technical effect. This allows the water accumulated on the slope to be deposited on the drainage net 2 and flow along the drainage net 2 to the side wall of the drainage ditch 1 facing the bottom of the slope of the enclosure structure. The water is then discharged into the drainage ditch 1 through the drainage pipe 3 set above the drainage net 2. This allows the drainage structure of this utility model to more efficiently guide the water accumulated in the enclosure structure and to intercept the soil in the green soil layer 6 that may be lost through the filter and anti-clogging structure 4.

[0018] Furthermore, in the drainage structure used for flexible landfill closure described above, the filter and anti-clogging structure 4 is composed of a geonet wrapped around a pile of crushed stone, and the filter and anti-clogging structure 4 wraps around the part of the drainage pipe 3 located on the outside of the ditch wall. The structure is relatively simple and can effectively reduce costs.

[0019] Furthermore, the portion of the drainage pipe 3 located on the outside of the ditch wall is wrapped with geonet, and the filter and anti-clogging structure 4 is wrapped around the outside of the geonet, which greatly reduces the frequency of blockage caused by soil and fine sand in the green soil layer 6 through the gaps in the gravel pile in the filter and anti-clogging structure 4.

[0020] Furthermore, the thickness of the filter anti-clogging structure 4 is greater than the outer diameter of the drain pipe, and the width is more than twice the outer diameter of the drain pipe. In this embodiment, the thickness of the filter anti-clogging structure 4 is at least 100 mm, and the width is between 500 mm and 800 mm. According to actual tests, the filter anti-clogging structure 4 can have good anti-leakage performance under this size.

[0021] Furthermore, the drainage net 2 of the enclosure structure, located directly below the drainage ditch 1, extends towards the upper slope of the enclosure structure to a position beyond the drainage ditch 1 on one side of the ditch wall of the upper slope of the enclosure structure, such as... Figure 2 As shown, when there is a lot of water on the drainage net 2, some of the water may seep down from the connection between the drainage net 2 and the side wall of the drainage ditch 1. The above structure can guide the seeping water to the drainage net 2 at the bottom of the drainage ditch 1 and eventually flow out of the sealing structure.

[0022] When this utility model is put into use, the water accumulated in the enclosure structure due to rainfall and other reasons seeps into the green soil layer 6. Then, most of the water passes through the drainage layer 5 and is retained on the drainage net 2. The water on the drainage net 2 flows down the slope structure from top to bottom to the filter and anti-clogging structure 4. After the filter and anti-clogging structure 4 intercepts the soil that may be carried by the green soil layer 6 in the water, the water enters the inlet of the drainage pipe 3 in the filter and anti-clogging structure 4, and then flows into the drainage ditch 1 through the outlet of the drainage pipe 3, thus realizing the effective connection between the drainage ditch 1 and the drainage structure in the enclosure.

[0023] Compared with the prior art, the drainage structure for flexible landfills proposed in this utility model has the following advantages: by setting up drainage pipes that penetrate the drainage ditch wall and a filter and anti-clogging structure, it solves the problem that the drainage ditch and the drainage structure in the landfill structure are not effectively connected in the prior art. This allows the water in the surface green soil layer to be effectively diverted while reducing the frequency of drainage pipe blockage, making the landfill structure more stable and avoiding accidents such as landslides.

Claims

1. A drainage structure for closure of a flexible landfill, comprising, from bottom to top, an impermeable layer (8), a drainage layer (5), and a greening soil layer (6), the drainage structure further comprising a drainage ditch (1) and a drainage net (2), wherein the drainage ditch (1) is located at the bottom of the upper slope of the closure structure, and the drainage net (2) is located between the drainage layer (5) and the impermeable layer (8), characterized in that: At a location near the drainage ditch (1), the drainage net (2) passes through the drainage layer (5) in the thickness direction of the enclosure structure and is close to the green soil layer (6) and connected to the side wall of the drainage ditch (1). At least two drainage pipes (3) are provided on the side wall of the drainage ditch (1) facing the bottom of the upper slope of the enclosure structure. The inlet of the drainage pipe (3) faces the upper slope of the enclosure structure and is set close to the upper surface of the drainage net (2). The outlet of the drainage pipe (3) leads into the drainage ditch (1). It also includes a filter anti-clogging structure (4). The filter anti-clogging structure (4) is laid above the drainage net (2) on the outside of the ditch wall and below the upper surface of the green soil layer (6). The inlet of the drainage pipe (3) is set in the filter anti-clogging structure (4).

2. The drainage structure for flexible landfill closure according to claim 1, characterized in that: The filter anti-clogging structure (4) is composed of a geonet wrapped around a pile of gravel, and the filter anti-clogging structure (4) wraps around the part of the drainage pipe (3) located on the outside of the ditch wall.

3. The drainage structure for flexible landfill closure according to claim 2, characterized in that: The portion of the drainage pipe (3) located outside the ditch wall is wrapped with geonet, and the filter anti-clogging structure (4) is wrapped around the outside of the geonet.

4. The drainage structure for flexible landfill closure according to claim 2, characterized in that: The thickness of the filter anti-clogging structure (4) is greater than the outer diameter of the drain pipe, and the width is more than twice the outer diameter of the drain pipe.

5. The drainage structure for flexible landfill closure according to claim 1, 2 or 3, characterized in that: The drainage net (2) of the enclosure structure located directly below the drainage ditch (1) extends to the upper slope of the enclosure structure to a position on one side of the ditch wall of the upper slope of the enclosure structure, beyond the drainage ditch (1).

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