A floor drain type anti-seepage and drainage guiding structure for a landfill site and its construction method

Abstract

The present invention discloses a floor drain type anti-seepage and drainage structure for a landfill site and its construction method, which relates to the technical field of anti-seepage and drainage of landfill sites, and mainly solves the problem that uneven settlement is likely to occur in valley-type landfill sites, resulting in leakage of leachate. The present invention adopts a floor drain type anti-seepage and drainage scheme for leachate drainage, specifically including an anti-seepage membrane evenly laid at the bottom and the edge protection of the landfill dam body. The edges of the anti-seepage membrane are hot-melt spliced together. A floor drain drainage mechanism is arranged at the bottom of the landfill dam body. The floor drain drainage mechanism includes a concrete fixing frame, a filter plate is installed in the fixing frame, the anti-seepage membrane is laid on the inner wall of the concrete fixing frame, an anti-seepage membrane edge sealing device is arranged between the anti-seepage membrane and the inner wall of the concrete fixing frame, the bottom of the concrete fixing frame is hermetically spliced with a sealing joint, and the sealing joint is connected to the main drainage pipe through a leachate drainage pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-seepage and drainage for landfills, and specifically to a floor drain type anti-seepage and drainage structure for landfill sites and its construction method. Background Art

[0002] In general, for valley-type landfills, a garbage dam is built at the entrance of the valley to form a basin-shaped landfill storage area. An anti-seepage layer is laid at the bottom of the storage area and on the valley slopes. Above the anti-seepage layer, a leachate drainage layer is arranged to collect the leachate generated during the landfill process due to rainfall infiltration and the decomposition of the garbage itself. The leachate is introduced into the sewage treatment system through drainage pipes. During the drainage process, the drainage pipes need to pass through the garbage dam. The traditional method uses a direct dam-piercing process, that is, the drainage pipes directly pass through the garbage dam in the form of straight pipes according to the slope of the storage area, and the anti-seepage membrane is patched and welded at the intersection of the pipe and the anti-seepage layer on the surface of the dam.

[0003] For valley-type landfill garbage dams, the earth and stone materials excavated from the storage area are generally used as the dam-building materials. Due to construction compaction technology, later settlement, landfill operation compaction, etc., the garbage dam is extremely prone to uneven settlement under various stress actions, resulting in the anti-seepage membrane at the dam-piercing part being torn, the pipe and membrane being separated, and the leachate leaking, which destroys the overall anti-seepage effect of the landfill and is difficult to repair. Summary of the Invention

[0004] The purpose of the present invention is to provide a floor drain type anti-seepage and drainage structure for landfill sites and its construction method to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A floor drain type anti-seepage and drainage structure for landfill sites includes an anti-seepage membrane evenly laid at the bottom and on the edge protection of the landfill dam. The edges of the anti-seepage membrane are hot-melt spliced together. A floor drain drainage mechanism is arranged at the bottom of the landfill dam. The floor drain drainage mechanism includes a concrete fixing frame. A filter plate is installed inside the fixing frame. The anti-seepage membrane is laid on the inner wall of the concrete fixing frame. An anti-seepage membrane edge sealing device is arranged between the anti-seepage membrane and the inner wall of the concrete fixing frame. The bottom of the concrete fixing frame is hermetically spliced with a sealing joint. The sealing joint is connected to the main drainage pipe through a leachate drainage pipe. A first leachate drainage layer is arranged at the bottom of the landfill dam. A first filter geotextile is laid on the upper side of the first leachate drainage layer.

[0007] As a further solution of the present invention: the inner edge of the concrete fixing frame is provided with a fillet, the anti-seepage membrane is laid downwards on the inner wall of the concrete fixing frame, the anti-seepage membrane edge sealing device includes mounting pins arranged on the inner wall of the concrete fixing frame, a fixing bolt is connected to the mounting pins, the fixing bolt is threadedly connected with a hexagonal nut, and a leak-proof washer is arranged between the hexagonal nut and the anti-seepage membrane.

[0008] As a still further solution of the present invention: the bottom of the concrete fixing frame is provided with a plug-in groove, the sealing joint is provided with a plug-in port that cooperates with the plug-in groove, and a sealing washer is arranged between the plug-in port and the plug-in groove.

[0009] As a still further solution of the present invention: a gas guiding well gabion drainage mechanism is further arranged on the floor drain drainage mechanism, the gas guiding well gabion drainage mechanism includes steel bars fixed on the concrete fixing frame, the steel bars are arranged in a ring to form a steel cage, an inner hoop and an outer hoop are respectively arranged on the inner and outer circles of the steel cage, the inner hoop, the outer hoop and the steel bars are fixed by binding wires, the inner hoop and the outer hoop are evenly distributed on the inner and outer surfaces of the steel cage, and a gabion drainage layer is filled in the steel cage.

[0010] As a still further solution of the present invention: a second reverse filtration geotextile is arranged between the steel cage and the outer hoop, and a third reverse filtration geotextile is arranged between the steel cage and the inner hoop.

[0011] As a still further solution of the present invention: the sealing joint is provided with a fixing flange, the bottom of the sealing joint is provided with a concrete installation layer, the sealing joint is supported and installed between the fixing flange and the concrete installation layer, and both ends of the leachate drainage pipe are respectively connected to the sealing joint and the main drainage pipe through a first rotary joint and a second rotary joint.

[0012] As a still further solution of the present invention: the edge of the anti-seepage membrane is provided with an anti-slip side skirt.

[0013] A construction method of a floor drain type anti-seepage and drainage structure for a landfill site as described above includes the steps:

[0014] S1. Excavate at the selected site, complete the earthwork operation of the landfill dam body, continue to excavate downward at the bottom of the excavated landfill dam body, and lay the main drainage pipe;

[0015] S2. Reserve a leachate drainage pipe on the main drainage pipe, and the lower end of the leachate drainage pipe is hermetically connected to the main drainage pipe, and the upper end of the leachate drainage pipe is placed naturally;

[0016] S3. Cover the upper side of the main drainage pipe with soil, with the soil covering thickness being 15 - 20 cm. Subsequently, construct a concrete installation layer on the surface of the soil covering. When pouring the concrete installation layer, reserve an installation hole between the leachate drainage pipe and the sealing joint.

[0017] S4. After the concrete installation layer hardens, install the sealing joints in batches, and at the same time connect the sealing joints with the leachate drainage pipe.

[0018] S5. Customize the concrete fixing frame components in batches, dock and install between the concrete fixing frame and the sealing joint. After the installation is completed, cover the soil around the concrete fixing frame and compact it.

[0019] S6. Lay the anti-seepage membrane along the landfill specifications set in S1, and seal and install between the anti-seepage membrane and the concrete fixing frame. At the same time, install a gas guide well stone cage drainage mechanism inside the concrete fixing frame, lay a first leachate drainage layer at the bottom of the first layer of filter geotextile, and lay a stone cage drainage layer in the gas guide well stone cage drainage mechanism.

[0020] S6. After the floor drain type drainage structure is laid, carry out landfill operations.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] By burying the main drainage pipe at the bottom of the landfill dam body in the present invention, cooperating with the setting of the leachate drainage pipe and the concrete installation layer, uniformly install the sealing joints. Through the mutual cooperation of the sealing joints and the precast concrete fixing frame, quickly complete the installation of the floor drain drainage structure; at the same time, install a gas guide well stone cage drainage mechanism in the floor drain drainage mechanism to improve the leachate diversion efficiency, save the installation cost and installation difficulty with the gas guide well, improve the sealing effect of the leachate drainage, effectively reduce the possibility of leakage, and at the same time improve the leachate drainage speed, accelerate the internal biological fermentation process of the landfill dam body, and further shorten the impact period on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a floor drain type anti-seepage and drainage structure for a landfill site.

[0024] Figure 2 It is an enlarged schematic structural diagram at A of a floor drain type anti-seepage and drainage structure for a landfill site.

[0025] Figure 3 It is an enlarged schematic structural diagram at B of a floor drain type anti-seepage and drainage structure for a landfill site.

[0026] Figure 4 It is a cross-sectional schematic diagram of a gas guide well stone cage of a floor drain type anti-seepage and drainage structure for a landfill site.

[0027] Figure 5 It is a schematic internal sectional view showing the cooperation between the concrete fixing frame and the insertion interface in a floor drain type anti-seepage and drainage structure for a landfill site.

[0028] In the figure: 1 landfill dam body, 2 anti-seepage membrane, 3 first filter geotextile, 4 first leachate drainage layer, 5 gas guide well gabion, 50 steel bar column, 51 outer hoop, 52 second filter geotextile, 53 inner hoop, 54 third filter geotextile, 55 binding wire, 6 sealing joint, 60 insertion interface, 61 sealing washer, 62 insertion slot, 7 fixing flange, 8 concrete installation layer, 9 leachate drainage pipe, 10 first rotary joint, 11 second rotary joint, 12 main drainage pipe, 13 concrete fixing frame, 14 installation pin, 15 fixing bolt, 16 hexagonal nut, 17 anti-leakage washer, 18 gabion drainage layer, 19 filter plate, 20 anti-slip side skirt. Specific embodiments

[0029] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0031] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The technical solutions of this patent will be further described in detail below in conjunction with specific embodiments.

[0033] As Figures 1-5As shown in the figure, a floor drain type anti-seepage and drainage structure for a landfill site includes an anti-seepage membrane 2 uniformly laid at the bottom of the landfill dam 1 and the edge protection. The edges of the anti-seepage membrane 2 are hot-melt spliced together. A floor drain drainage mechanism is arranged at the bottom of the landfill dam 1. The floor drain drainage mechanism includes a concrete fixing frame 13. A filter plate 19 is installed inside the fixing frame. The anti-seepage membrane 2 is laid on the inner wall of the concrete fixing frame 13. An edge sealing device of the anti-seepage membrane 2 is arranged between the anti-seepage membrane 2 and the inner wall of the concrete fixing frame 13. A sealing joint 6 is hermetically spliced at the bottom of the concrete fixing frame 13. The sealing joint 6 is connected to the main drainage pipe 12 through a leachate drainage pipe 9. A first leachate drainage layer 4 is arranged at the bottom of the landfill dam 1. A first reverse filtration geotextile 3 is laid on the upper side of the first leachate drainage layer 4.

[0034] Specifically, the anti-seepage membrane 2 is laid according to the base surface of the landfill dam. The edge of the anti-seepage membrane 2 is hermetically sealed with the concrete fixing frame 13. The laid first leachate drainage layer 4 and the first reverse filtration geotextile 3 cooperate to introduce the landfill leachate into the concrete fixing frame 13, and then enter the sealing joint 6 and the main drainage pipe 12 after being filtered by the filter plate 19.

[0035] As a further scheme of the present invention: a fillet is arranged at the inner ring edge of the concrete fixing frame 13. The anti-seepage membrane 2 is laid downward on the inner wall of the concrete fixing frame 13. The edge sealing device of the anti-seepage membrane 2 includes mounting pins 14 arranged on the inner wall of the concrete fixing frame 13. A fixing bolt 15 is connected to the mounting pins 14. The fixing bolt 15 is threadedly connected with a hexagonal nut 16. A leak-proof washer 17 is arranged between the hexagonal nut 16 and the anti-seepage membrane 2.

[0036] Specifically, the fillet is arranged to facilitate the installation of the anti-seepage membrane 2 and prevent scratches on the anti-seepage membrane 2 from causing leakage. The sealing operation between the anti-seepage membrane 2 and the inner wall of the concrete fixing frame 13 is realized through the mounting pins 14, the fixing bolts 15, the hexagonal nuts 16 and the leak-proof washers 17.

[0037] As a further scheme of the present invention: a plug-in groove 62 is arranged at the bottom of the concrete fixing frame 13. An insertion port 60 matched with the plug-in groove 62 is arranged on the sealing joint 6. A sealing washer 61 is arranged between the insertion port 60 and the plug-in groove 62.

[0038] Specifically, the concrete fixing frame 13 and the sealing joint 6 cooperate with each other through the plug-in groove 62, and the leachate is hermetically drained in combination with the sealing washer 61.

[0039] As a further solution of the present invention: A gas guide well gabion 5 drainage mechanism is further provided on the floor drain drainage mechanism. The gas guide well gabion 5 drainage mechanism includes a steel bar column 50 fixed on the concrete fixing frame 13. The steel bar columns 50 are arranged in a ring to form a steel bar cage. An inner hoop 53 and an outer hoop 51 are respectively arranged on the inner and outer circles of the steel bar cage. The inner hoop 53, the outer hoop 51 and the steel bar column 50 are fixed by binding wires 55. The inner hoop 53 and the outer hoop 51 are evenly distributed on the inner and outer surfaces of the steel bar cage. A gabion drainage layer 18 is filled in the steel bar cage.

[0040] Specifically, in order to further improve the leachate drainage efficiency and shorten the biological fermentation cycle of the landfill, a gas guide well gabion 5 drainage mechanism is synchronously arranged on the floor drain drainage mechanism. The steel bar cage increases with the increase of the landfill height of the landfill. The evenly distributed gas guide well gabions 5 transport the leachate to the floor drain drainage mechanism while guiding gas, and are sent into the main drainage pipe 12 through the concrete fixing frame 13, the sealing joint 6 and the leachate drainage pipe 9.

[0041] As a further solution of the present invention: A second reverse filtration geotextile 52 is arranged between the steel bar cage and the outer hoop 51, and a third reverse filtration geotextile 54 is arranged between the steel bar cage and the inner hoop 53.

[0042] Specifically, the second reverse filtration geotextile 52 and the third reverse filtration geotextile 54 can filter out impurities in the leachate and prevent the drainage pipes from being blocked.

[0043] As a further solution of the present invention: A fixing flange 7 is arranged on the sealing joint 6. A concrete installation layer 8 is arranged at the bottom of the sealing joint 6. The sealing joint 6 is supported and installed between the fixing flange 7 and the concrete installation layer 8. The two ends of the leachate drainage pipe 9 are respectively connected to the sealing joint 6 and the main drainage pipe 12 through a first rotary joint 10 and a second rotary joint 11.

[0044] As a further solution of the present invention: An anti-slip edge skirt 20 is arranged at the edge of the anti-seepage membrane 2.

[0045] A construction method of a floor drain type anti-seepage and drainage structure for a landfill as described above includes the steps:

[0046] S1. Excavate at the selected site to complete the earthwork operation of the landfill dam 1. Continue to excavate downward at the bottom of the excavated landfill dam 1 and lay the main drainage pipe 12.

[0047] S2. Reserve a leachate drainage pipe 9 on the main drainage pipe 12, and the lower end of the leachate drainage pipe 9 is hermetically connected to the main drainage pipe 12, and the upper end of the leachate drainage pipe 9 is placed naturally.

[0048] S3. Cover the upper side of the main drainage pipe 12 with soil, with the soil covering thickness being 15 - 20 cm. Subsequently, construct a concrete installation layer 8 on the surface of the soil covering. When pouring the concrete installation layer 8, reserve an installation hole between the leachate drainage pipe 9 and the sealing joint 6;

[0049] S4. After the concrete installation layer 8 hardens, install the sealing joints 6 in batches, and at the same time connect the sealing joints 6 to the leachate drainage pipes;

[0050] S5. Customize the concrete fixing frame 13 components in batches, dock and install between the concrete fixing frame 13 and the sealing joint 6. After the installation is completed, cover the soil around the concrete fixing frame 13 and compact it;

[0051] S6. Lay the anti-seepage membrane 2 along the landfill specifications set in S1, and seal and install between the anti-seepage membrane 2 and the concrete fixing frame 13. At the same time, install the gas guide well stone cage 5 drainage mechanism inside the concrete fixing frame 13, lay the first leachate drainage layer 4 at the bottom of the first layer of reverse filtration geotextile, and lay the stone cage drainage layer 18 in the gas guide well stone cage 5 drainage mechanism;

[0052] S6. After the floor drain type drainage structure is laid, carry out landfill operations.

[0053] As Figures 1-5 shown, through burying the main drainage pipe 12 at the bottom of the landfill dam 1 of the present invention, cooperating with the settings of the leachate drainage pipe 9 and the concrete installation layer 8, the sealing joints 6 are evenly installed. Through the mutual cooperation of the sealing joints 6 and the precast concrete fixing frame 13, the installation of the floor drain drainage structure is quickly completed; at the same time, install the gas guide well stone cage 5 drainage mechanism in the floor drain drainage mechanism to improve the leachate diversion efficiency, save the installation cost and installation difficulty with the gas guide well, improve the sealing effect of the leachate drainage, effectively reduce the possibility of leakage, and at the same time increase the leachate drainage speed, accelerate the internal biological fermentation process of the landfill dam 1, and further shorten the impact period on the surrounding environment.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0055] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A floor drain type anti-seepage and drainage structure for a landfill site, comprising an anti-seepage membrane (2) uniformly laid at the bottom and the edge protection of the landfill dam body (1), and the edges of the anti-seepage membrane (2) are hot-melt spliced together, characterized in that, A floor drain drainage mechanism is arranged at the bottom of the landfill dam body (1). The floor drain drainage mechanism includes a concrete fixing frame (13), a filter plate (19) is installed in the fixing frame, the anti-seepage membrane (2) is laid on the inner wall of the concrete fixing frame (13), and an edge sealing device of the anti-seepage membrane (2) is arranged between the anti-seepage membrane (2) and the inner wall of the concrete fixing frame (13). The bottom of the concrete fixing frame (13) is hermetically spliced with a sealing joint (6), the sealing joint (6) is connected with a main drainage pipe (12) through a leachate drainage pipe (9), a first leachate drainage layer (4) is arranged at the bottom of the landfill dam body (1), and a first filter geotextile (3) is laid on the upper side of the first leachate drainage layer (4); The inner edge of the concrete fixing frame (13) is provided with a fillet. The anti-seepage membrane (2) is laid downward on the inner wall of the concrete fixing frame (13). The edge sealing device of the anti-seepage membrane (2) includes mounting pins (14) arranged on the inner wall of the concrete fixing frame (13). A fixing bolt (15) is connected to the mounting pins (14). The fixing bolt (15) is in threaded connection with a hexagonal nut (16). A leak-proof washer (17) is arranged between the hexagonal nut (16) and the anti-seepage membrane (2). An anti-slip skirt (20) is arranged at the edge of the anti-seepage membrane (2); A gas guide well gabion (5) drainage mechanism is further arranged on the floor drain drainage mechanism. The gas guide well gabion (5) drainage mechanism includes steel bars (50) fixed on the concrete fixing frame (13). The steel bars (50) are arranged in a ring to form a steel cage. An inner hoop (53) and an outer hoop (51) are respectively arranged on the inner and outer circles of the steel cage. The inner hoop (53), the outer hoop (51) and the steel bars (50) are fixed through binding wires (55). The inner hoop (53) and the outer hoop (51) are evenly distributed on the inner and outer surfaces of the steel cage. A gabion drainage layer (18) is filled in the steel cage; A second filter geotextile (52) is arranged between the steel cage and the outer hoop (51), and a third filter geotextile (54) is arranged between the steel cage and the inner hoop (53).

2. The leak-proof drainage structure for a landfill site according to claim 1, characterized in that, A plug-in groove (62) is arranged at the bottom of the concrete fixing frame (13). An insertion port (60) matched with the plug-in groove (62) is arranged on the sealing joint (6). A sealing washer (61) is arranged between the insertion port (60) and the plug-in groove (62).

3. A landfill floor drain type anti-seepage and drainage structure according to claim 1, characterized in that, A fixing flange (7) is arranged on the sealing joint (6). A concrete installation layer (8) is arranged at the bottom of the sealing joint (6). The sealing joint (6) is supported and installed between the fixing flange (7) and the concrete installation layer (8). The two ends of the leachate drainage pipe (9) are respectively connected with the sealing joint (6) and the main drainage pipe (12) through a first rotary joint (10) and a second rotary joint (11).

4. Construction method of a floor drain type anti-seepage and drainage structure for a landfill site, characterized in that, The construction of the floor drain type anti-seepage and drainage structure of the landfill site according to any one of claims 1-3 includes the steps: S1. Excavate at the selected site to complete the earthwork operation of the landfill dam body (1). Continue to excavate downward at the bottom of the excavated landfill dam body (1) and lay the main drainage pipe (12). S2. Reserve an interface for the leachate drainage pipe (9) on the main drainage pipe (12). The lower end of the leachate drainage pipe (9) is hermetically connected to the upper interface of the main drainage pipe (12), and the upper end of the leachate drainage pipe (9) is placed naturally. S3. Cover the soil on the upper side of the main drainage pipe (12) with a soil covering thickness of 15 - 20 cm. Then, construct a concrete installation layer (8) on the surface of the soil covering. When pouring the concrete installation layer (8), reserve an installation hole for connecting the leachate drainage pipe (9) and the sealing joint (6). S4. After the concrete installation layer (8) hardens, install the sealing joints (6) in batches, and at the same time connect the sealing joints (6) to the leachate drainage pipe. S5. Customize the concrete fixing frame (13) components in batches, dock and install the concrete fixing frame (13) with the sealing joint (6). After installation, cover the soil around the concrete fixing frame (13) and compact it. S6. Lay the anti-seepage membrane (2) along the landfill specifications set in S1, and hermetically install the anti-seepage membrane (2) with the concrete fixing frame (13). At the same time, install the gas drainage mechanism of the gas drainage well stone cage (5) inside the concrete fixing frame (13). Lay the first leachate drainage layer (4) at the bottom of the first layer of reverse filtration geotextile, and lay the stone cage drainage layer (18) in the gas drainage well stone cage (5) drainage mechanism. S6. After the floor drain type drainage structure is laid, carry out the landfill operation.

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