A flood interception structure for a landfill

Abstract

This utility model discloses a landfill seepage prevention and flood interception structure, including a landfill area and a flood interception ditch located on one side of the landfill area. The landfill area contains a bottom membrane and a waste pile on the bottom membrane, which is covered with a cover membrane. The bottom membrane extends towards one side of the flood interception ditch to form a first extension membrane, and the cover membrane extends towards one side of the flood interception ditch to form a second extension membrane. The first and / or second extension membranes are attached to the inner wall of the flood interception ditch to form a trench membrane. A dense fixing structure is provided on the top surface of the side wall of the flood interception ditch away from the landfill area. The trench membrane extends to and is fixed by the dense fixing structure. This landfill seepage prevention and flood interception structure has advantages such as simple structure and improved overall waterproofing and flood resistance.

Description

Technical Field

[0001] This utility model relates to the field of landfill technology, specifically to a landfill seepage prevention and flood interception structure. Background Technology

[0002] Landfilling has long been a primary method of waste treatment and disposal, playing a vital role in human production and daily life. However, simply burying waste in a landfill does not guarantee a permanent solution. Subsequent closure and maintenance are required. Closure primarily involves covering the waste to prevent external water from entering the landfill. Maintenance mainly involves managing leachate generated by the waste itself. If external water enters the landfill, it not only increases the amount of leachate the operating unit needs to handle daily but also increases pressure on the landfill dam, potentially impacting the overall safety of the landfill.

[0003] Therefore, the water level inside the landfill directly affects the overall operating costs and maintenance risks of the landfill.

[0004] The water level in a landfill area is mainly affected by the following factors: 1) leachate generated by the landfill structure; 2) surface runoff recharge; and 3) groundwater surrounding the landfill. To reduce the impact of these factors, during the actual construction phase of the landfill, geomembranes are typically used as the covering material for the landfill structure and as a seepage barrier at the bottom of the landfill. Their main functions are as follows: 1) Prevent surface runoff and surrounding groundwater from entering the reservoir area, raising the water level and increasing daily treatment costs; 2) To prevent leachate from the bottom of the landfill from leaking outside the landfill and causing pollution to the surrounding environment.

[0005] A Chinese patent application with application number 202420657733.1 discloses a slope interception ditch for the early closure of a landfill with a gentle slope and valley shape. The ditch includes a flood interception ditch, bolts, and a ballast layer. The flood interception ditch is formed at a predetermined location on the slope of the landfill area. The bolts anchor the landfill geomembrane and the bottom membrane of the landfill area to the inside of the flood interception ditch. The ballast layer is placed inside the flood interception ditch to provide ballast fixation for the geomembrane and the bottom membrane of the landfill area anchored within the ditch. This slope interception ditch for the early closure of a landfill with a gentle slope and valley shape has the following shortcomings: 1) The geomembrane or landfill bottom membrane is only extended to the bottom of the intercepting ditch, meaning that there is no membrane covering the side wall of the intercepting ditch away from the intercepting ditch. Water from the intercepting ditch can easily seep into the landfill through the unmembrane portion, affecting the overall waterproofing and waterproofing performance. 2) The intercepting ditch is level with the side wall of the landfill, and water in the intercepting ditch can easily seep into the landfill through the gap between the sealing membrane and the bottom membrane of the landfill area, affecting the structural stability of the landfill and increasing the amount of leachate. Furthermore, leachate in the landfill can also easily seep into the intercepting ditch through the gap between the sealing membrane or the bottom membrane of the landfill area, causing environmental pollution. In other words, the sealing and seepage prevention of the landfill is poor.

[0006] A Chinese patent application with application number 202021338289.5 discloses an odor control and stormwater / sewage separation facility for municipal solid waste landfills. This facility employs a temporary brick-and-rubble road with a clay anchoring trench structure. The anchoring trench is a channel excavated on the waste pile on both sides of the temporary road. Non-woven geotextile is laid inside the trench, and an HDPE covering film is laid on top of the geotextile. A compacted clay layer is then backfilled on top of the trench. This odor control and stormwater / sewage separation facility places the trench on the waste pile, collecting water in the trench and discharging it through it. However, on the one hand, the gravity and flow of water within the trench affect the stability of the waste pile, potentially causing localized collapse and other safety risks. On the other hand, the waterproofing and seepage prevention requirements between the trench and the waste pile are high, resulting in high costs for waterproofing and seepage prevention. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a landfill seepage prevention and flood interception structure that is simple in structure and improves the overall waterproof and flood-resistant performance.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A landfill seepage prevention and flood interception structure includes a landfill area and a flood interception ditch located on one side of the landfill area. The landfill area is provided with a bottom membrane and a garbage pile located on the bottom membrane. The garbage pile is covered with a cover membrane. The bottom membrane extends to one side of the flood interception ditch to form a first extension membrane, and the cover membrane extends to one side of the flood interception ditch to form a second extension membrane. The first extension membrane and / or the second extension membrane are attached to the inner wall of the flood interception ditch to form a trench membrane. A dense fixing structure is provided on the top surface of the side wall of the flood interception ditch away from the landfill area. The trench membrane extends to the dense fixing structure and is fixed by the dense fixing structure.

[0009] As a further improvement to the above technical solution: The compacted fixing structure includes a pit, anchors, and a sealing concrete cover. The pit is located on the top surface of the side wall of the intercepting ditch away from the landfill area. The ditch membrane extends into the pit to form an entry membrane. The entry membrane is fixed by anchors. The sealing concrete cover is filled in the sealing concrete cover and covers the entry membrane.

[0010] The horizontal distance between the pit and the intercepting ditch is 50-80cm.

[0011] The pit is 40-50cm wide and 18-22cm deep.

[0012] The horizontal distance between the intercepting ditch and the landfill area is 2 to 3 meters.

[0013] The cross-section of the intercepting ditch is rectangular or trapezoidal, wider at the top and narrower at the bottom.

[0014] A partition wall is formed between the flood interception ditch and the landfill area. The height of the partition wall gradually decreases along the direction from the landfill area to the flood interception ditch, and the height of the flood interception ditch on the side facing the partition wall is higher than that on the other side.

[0015] The first and second extended films overlap and cover the top surface of the spacer wall.

[0016] The bottom of the intercepting ditch is provided with a membrane concrete, which is pressed onto the ditch membrane.

[0017] Both the bottom film and the cover film are high-density polyethylene films.

[0018] Compared with the prior art, the advantages of this utility model are: The landfill seepage prevention and flood interception structure of this utility model has a second extension membrane that extends from the cover membrane to one side of the flood interception ditch and is attached to the inner wall of the flood interception ditch to form a ditch membrane. The ditch membrane extends to the top surface of the side wall of the flood interception ditch away from the landfill area and is fixed by a dense fixing structure. In this way, the water flowing into the flood interception ditch is located on the ditch membrane and is isolated from the inner wall of the flood interception ditch by the ditch membrane, preventing the water in the flood interception ditch from seeping into the landfill area 1 through the side wall of the flood interception ditch, thereby improving the overall waterproof and flood-proof performance.

[0019] This utility model's landfill seepage prevention and flood interception structure has several advantages. First, the height of the partition wall gradually decreases along the direction from the landfill area to the interception ditch, which helps prevent water in the interception ditch from flowing into the landfill area. Second, it reduces the sealing requirements of the first and second extension membranes covering the partition wall. Third, the height of the interception ditch facing the partition wall is higher than that of the other side, further preventing water in the interception ditch from flowing into the landfill area. This further enhances the overall waterproofing and flood prevention capabilities. Furthermore, because the partition wall is higher on the side facing the landfill area, it helps prevent leachate from the landfill from seeping into the interception ditch through the top of the partition wall. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of one embodiment of the landfill seepage prevention and flood interception structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the second embodiment of the landfill seepage prevention and flood interception structure of this utility model.

[0022] The labels in the diagram represent: 1. Landfill area; 2. Flood interception ditch; 3. Bottom membrane; 31. First extension membrane; 4. Waste pile; 5. Cover membrane; 51. Second extension membrane; 6. Trench membrane; 61. Pit membrane; 7. Dense fixing structure; 71. Pit; 72. Anchor; 73. Concrete covering at the end; 8. Partition wall; 9. Pressed concrete membrane. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 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 be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Example 1: Figure 1This invention illustrates an embodiment of a landfill seepage prevention and flood interception structure. The landfill seepage prevention and flood interception structure of this embodiment includes a landfill area 1 and a flood interception ditch 2 located on one side of the landfill area 1. The landfill area 1 contains a bottom membrane 3 and a waste pile 4 located on the bottom membrane 3. The waste pile 4 is covered with a cover membrane 5. The bottom membrane 3 extends towards one side of the flood interception ditch 2 to form a first extension membrane 31, and the cover membrane 5 extends towards one side of the flood interception ditch 2 to form a second extension membrane 51. The second extension membrane 51 is attached to the inner wall of the flood interception ditch 2 to form a trench membrane 6. A dense fixing structure 7 is provided on the top surface of the side wall of the flood interception ditch 2 away from the landfill area 1. The trench membrane 6 extends to the dense fixing structure 7 and is fixed by the dense fixing structure 7.

[0028] In this landfill seepage prevention and flood interception structure, the second extension membrane 51, which extends from the cover membrane 5 to one side of the flood interception ditch 2, is attached to the inner wall of the flood interception ditch 2 to form a trench membrane 6. The trench membrane 6 extends to the top surface of the side wall of the flood interception ditch 2 away from the landfill area 1 and is fixed by a dense fixing structure 7. In this way, the water flowing into the flood interception ditch 2 is all located on the trench membrane 6 and is isolated from the inner wall of the flood interception ditch 2 by the trench membrane 6, preventing the water in the flood interception ditch 2 from seeping into the landfill area 1 through the side wall of the flood interception ditch 2, thereby improving the overall waterproof and flood-proof performance.

[0029] Furthermore, in this embodiment, the compacted fixing structure 7 includes a pit 71, anchors 72, and a closing concrete cover 73. The pit 71 is located on the top surface of the side wall of the intercepting ditch 2 away from the landfill area 1. The trench membrane 6 extends into the pit 71 to form an entry membrane 61, which is fixed by the anchors 72. The closing concrete cover 73 is filled into the closing concrete cover 73 and covers the entry membrane 61. The entry membrane 61 is fixed by the anchors 72 and compacted by the closing concrete cover 73, thereby improving the compactness of the trench membrane 6 at the closing point and further improving the overall waterproof and flood-proof performance. The anchors 72 can be anchor steel bars, anchor screws, etc.

[0030] Furthermore, in this embodiment, the horizontal distance between the pit 71 and the intercepting ditch 2 is 50-80cm. Within this range, it is beneficial to ensure both the structural strength of the pit 71 and the compactness of the closing point. Furthermore, in this embodiment, the pit 71 is 40-50cm wide and 18-22cm deep. Preferably, the pit 71 is 45cm wide and 20cm deep.

[0031] Furthermore, in this embodiment, the horizontal distance between the flood interception ditch 2 and the landfill area 1 is 2 to 3 meters, which helps to ensure the structural strength of the partition wall 8 between the flood interception ditch 2 and the landfill area 1.

[0032] Furthermore, in this embodiment, the cross-section of the intercepting ditch 2 is rectangular or trapezoidal with a wider top and narrower bottom, which is conducive to water inflow and drainage. Of course, the cross-section of the intercepting ditch 2 can also be in other shapes, such as V-shaped, semi-circular, etc.

[0033] Furthermore, in this embodiment, a partition wall 8 is formed between the intercepting ditch 2 and the landfill area 1. The height of the partition wall 8 gradually decreases along the direction from the landfill area 1 to the intercepting ditch 2, and the height of the intercepting ditch 2 facing the partition wall 8 is higher than that of the other side. On the one hand, the gradual decrease in height of the partition wall 8 along the direction from the landfill area 1 to the intercepting ditch 2 helps prevent water in the intercepting ditch 2 from flowing into the landfill area 1. On the other hand, it reduces the sealing requirements of the first extension membrane 31 and the second extension membrane 51 covering the partition wall 8. Thirdly, the higher height of the intercepting ditch 2 facing the partition wall 8 further helps prevent water in the intercepting ditch 2 from flowing into the landfill area 1. This further improves the overall waterproof and flood-proof performance. Moreover, since the partition wall 8 is higher on the side facing the landfill area 1, it helps prevent leachate from the waste pile 4 from seeping into the intercepting ditch 2 through the top of the partition wall 8.

[0034] Furthermore, in this embodiment, the first extended film 31 and the second extended film 51 overlap and cover the top surface of the partition wall 8. Specifically, the first extended film 31 covers the top surface of the partition wall 8, and the second extended film 51 covers the first extended film 31. Preferably, the first extended film 31 and the top surface of the partition wall 8, and the second extended film 51 and the first extended film 31, can be waterproofly sealed and bonded.

[0035] Furthermore, in this embodiment, the bottom of the intercepting ditch 2 is provided with a pressure-membrane concrete 9, which is pressed onto the ditch membrane 6. The ditch membrane 6 is pressed tightly by the pressure-membrane concrete 9 to prevent local arching that would affect drainage performance and service life.

[0036] Furthermore, in this embodiment, both the bottom film 3 and the cover film 5 are high-density polyethylene films. Of course, the bottom film 3 and the cover film 5 can also be made of other waterproof materials, which is not necessarily limited here.

[0037] Furthermore, in this embodiment, the cover membrane 5, the second extension membrane 51, the trench membrane 6, and the pit membrane 61 are a single, integrally formed membrane structure, which is beneficial for improving waterproofing and tumble resistance.

[0038] Furthermore, in this embodiment, the waste pile 4 is sealed between the bottom membrane 3 and the cover membrane 5.

[0039] Example 2: Figure 2This illustration shows one embodiment of the landfill seepage prevention and flood interception structure of this utility model. The structure of this embodiment is basically the same as that of Embodiment 1, except that: the first extended membrane 31 is attached to the inner wall of the flood interception ditch 2 to form a trench membrane 6, and a dense fixing structure 7 is provided on the top surface of the side wall of the flood interception ditch 2 away from the landfill area 1. The trench membrane 6 extends to the dense fixing structure 7 and is fixed by the dense fixing structure 7. That is to say, the bottom membrane 3, the first extended membrane 31, the trench membrane 6, and the pit membrane 61 are a single-piece membrane structure. Compared with Embodiment 1, the entrance of the connection seam between the first extended membrane 31 and the second extended membrane 51 is exposed to the outside, which places higher demands on the sealing connection between the first extended membrane 31 and the second extended membrane 51.

[0040] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A landfill seepage prevention and flood interception structure, comprising a landfill area (1) and a flood interception ditch (2) located on one side of the landfill area (1), wherein the landfill area (1) is provided with a bottom membrane (3) and a waste pile (4) located on the bottom membrane (3), the waste pile (4) is covered with a cover membrane (5), the bottom membrane (3) extends to one side of the flood interception ditch (2) to form a first extension membrane (31), and the cover membrane (5) extends to one side of the flood interception ditch (2) to form a second extension membrane (51), characterized in that: The first extension membrane (31) and / or the second extension membrane (51) are attached to the inner wall of the intercepting ditch (2) to form a trench membrane (6). A dense fixing structure (7) is provided on the top surface of the side wall of the intercepting ditch (2) away from the landfill area (1). The trench membrane (6) extends to the dense fixing structure (7) and is fixed by the dense fixing structure (7).

2. The landfill seepage prevention and flood interception structure according to claim 1, characterized in that: The compacted fixing structure (7) includes a pit (71), anchors (72), and a closing concrete cover (73). The pit (71) is located on the top surface of the side wall of the intercepting ditch (2) away from the landfill area (1). The trench membrane (6) extends into the pit (71) to form an entry membrane (61). The entry membrane (61) is fixed by the anchors (72). The closing concrete cover (73) is filled in the closing concrete cover (73) and covers the entry membrane (61).

3. The landfill seepage prevention and flood interception structure according to claim 2, characterized in that: The horizontal distance between the pit (71) and the intercepting ditch (2) is 50~80cm.

4. The landfill seepage prevention and flood interception structure according to claim 2, characterized in that: The pit (71) is 40-50cm wide and 18-22cm deep.

5. The landfill seepage prevention and flood interception structure according to claim 1, characterized in that: The horizontal distance between the intercepting ditch (2) and the landfill area (1) is 2~3m.

6. The landfill seepage prevention and flood interception structure according to claim 1, characterized in that: The cross-section of the intercepting ditch (2) is rectangular or trapezoidal, wider at the top and narrower at the bottom.

7. The landfill seepage prevention and flood interception structure according to any one of claims 1 to 6, characterized in that: A partition wall (8) is formed between the flood interception ditch (2) and the landfill area (1). The height of the partition wall (8) gradually decreases along the direction from the landfill area (1) to the flood interception ditch (2). The height of the flood interception ditch (2) on the side facing the partition wall (8) is higher than that on the other side.

8. The landfill seepage prevention and flood interception structure according to claim 7, characterized in that: The first extension film (31) and the second extension film (51) overlap and cover the top surface of the spacer wall (8).

9. The landfill seepage prevention and flood interception structure according to any one of claims 1 to 6, characterized in that: The bottom of the intercepting ditch (2) is provided with a pressure membrane concrete (9), which is pressed onto the ditch membrane (6).

10. The landfill seepage prevention and flood interception structure according to any one of claims 1 to 6, characterized in that: Both the bottom film (3) and the cover film (5) are high-density polyethylene films.

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