CN218492566U - A seepage prevention structure for domestic waste landfill is excavated once more - Google Patents
A seepage prevention structure for domestic waste landfill is excavated once more Download PDFInfo
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- CN218492566U CN218492566U CN202221530560.4U CN202221530560U CN218492566U CN 218492566 U CN218492566 U CN 218492566U CN 202221530560 U CN202221530560 U CN 202221530560U CN 218492566 U CN218492566 U CN 218492566U
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The utility model discloses an seepage prevention structure for domestic waste landfill is excavated once more, include at the landfill surface covering structure on landfill rubbish heap body upper portion, at landfill bottom seepage prevention structure of landfill rubbish lower part and the cofferdam structure in the landfill rubbish side, the cofferdam structure includes the weir body and sets up the cover membrane on the weir body surface, cover membrane one end fixed connection at landfill surface seepage prevention structure upper surface, one end fixed connection is at landfill bottom seepage prevention structure upper surface, cover the contained angle direction between membrane and the landfill surface seepage prevention structure, cover the contained angle direction between membrane and the landfill bottom seepage prevention structure all with ooze the leachate flow direction opposite. Through the fixed connection of the cover film on the surface of the cofferdam and the landfill seepage-proofing structure, the leachate flowing out of the garbage has a good isolation effect, the leachate is prevented from polluting the inner side of the cofferdam, the firm degree of the structure is enhanced through the specific connection position and direction, and the damage to the cofferdam caused by a large amount of leachate is prevented.
Description
Technical Field
The utility model relates to an environmental protection technical field especially relates to an anti-seepage structure for domestic waste landfill excavates once more.
Background
With the continuous improvement of economic level, people's living standard is increasing day by day, and the domestic waste production increases rapidly, and landfill is the domestic waste disposal mode who commonly uses. After the landfill is put into use, due to the change of the landfill operation process, the prolonging of the service life and the like, the landfill needs to be trimmed, cleaned, renovated, sealed and the like. In the process of landfill, due to the seepage action of compression, fermentation and other biochemical degradation on precipitation and underground water, leachate is generated. Leachate has high-concentration organic or inorganic components and complex water quality, and may contain organic pollutants, various metals, plant nutrients, toxic and harmful substances and the like. If leachate flows out in the process of re-excavating the landfill garbage, natural water bodies near a landfill site are easily polluted, so that environmental pollution is caused, and the production and life of residents are influenced. Therefore, in the process of excavating the household garbage landfill, a certain device is needed to be adopted to carry out blocking or dredging in advance on the possibly occurring leachate.
Chinese patent publication No. "CN107905209A" discloses a leachate collecting device for ecological restoration of sanitary landfill and a construction method thereof, the device includes a concrete foundation and an adjusting tank, the side of a leachate collecting main pipe is provided with a leachate collecting branch pipe, the leachate collecting branch pipe is provided with a leachate collecting hole, a metal rod is provided with a sleeve and a leachate guide plate, the end of the leachate guide plate is provided with a geogrid, and a gravel layer is filled in the region between the geogrid, the sealing plate and the covering plate. The construction method comprises the following steps: excavating a foundation pit; (b) building a regulating reservoir; (c) burying the leachate discharge pipe; (d) installing a leachate inflow section; (e) installing the leachate guide filter part; (f) filling the gravel layer; (g) installing a cover plate; (h) connecting an exhaust gas treatment device. The invention can fully collect leachate, improves the sewage discharge capability of the whole sanitary landfill, is installed from inside to outside, can determine the range of leachate collection space, and is easy to control construction operation. At present, a lot of reports are provided for leachate treatment devices or methods in the process of building and using a refuse landfill, but the reports for special leachate blocking or dredging devices in the process of excavating the refuse landfill are less.
Disclosure of Invention
The utility model relates to an overcome among the prior art excavation process leachate and have the problem that leak probably, easily cause the pollution to the environment, provide an seepage prevention structure for domestic waste landfill excavates once more, cover the membrane at cofferdam surface setting to be connected with the original seepage prevention structure in landfill, make it form complete seepage prevention structure, avoid leachate to flow, cause the pollution to the engineering.
In order to realize the purpose, the utility model adopts the following technical scheme:
the anti-seepage structure comprises a landfill surface covering structure arranged on the upper portion of a landfill body, a landfill bottom anti-seepage structure arranged on the lower portion of landfill waste and a cofferdam structure arranged on the side face of the landfill waste, wherein the cofferdam structure comprises a weir body and a cover film arranged on the surface of the weir body, the height of the weir body is 1 to 1.2m, a first connecting section and a second connecting section are respectively arranged on two sides of the cover film, the first connecting section is bent towards the direction away from the weir body, the first connecting section is fixedly connected with the landfill surface covering structure, the distance between the first connecting section and the weir body is larger than 1m, the second connecting section is bent towards the direction close to the weir body, and the second connecting section is fixedly connected with the upper surface of the landfill bottom anti-seepage structure.
In the leakage inspection, leachate drainage and partition excavation operation processes of the horizontal seepage-proofing system at the bottom of the domestic garbage landfill, cofferdams arranged around an operation area can isolate water flows inside and outside the cofferdams, so that environmental pollution and operation interference caused by mixed flow of internal and external rainwater and sewage are prevented. To the excavation of domestic waste landfill, because wherein the leachate that rubbish produced in stacking the in-process exists and continuously oozes probably, especially when carrying out construction operation near the rubbish dam, conventional cofferdam is very easily leaded to leachate to flow in from the gap because shape and prevention of seepage effect are not good, the utility model discloses set up on the cofferdam surface and covered the membrane to will cover the seepage prevention structure fixed connection of membrane and domestic waste landfill itself, form confined prevention of seepage system. Even if a large amount of leachate seeps out, the liquid can only flow in the cofferdam, and pollution cannot be caused. Meanwhile, the external leachate is blocked by the cofferdam structure and finally bypasses the cofferdam structure to enter a downstream pipeline or be discharged through a landfill seepage-proofing structure, the pollution to the construction area in the cofferdam can not be caused,
in the process of fixedly connecting the cofferdam covering film and the seepage-proofing structure of the domestic garbage landfill, in order to prevent the damage of the flowing of a large amount of leachate to the connection of the fixing structure, the covering film is respectively and fixedly connected with the upper surface of the surface covering structure of the landfill and the upper surface of the seepage-proofing structure at the bottom of the landfill, so that the flowing of the leachate in the covering film is ensured. Meanwhile, the direction of an included angle between the covering film and the covering structure on the surface of the landfill site and the direction of an included angle between the covering film and the impermeable structure at the bottom of the landfill site are opposite to the flow direction of leachate, so that the covering film and the impermeable structure are prevented from being fixedly connected and torn due to the fact that a large amount of leachate is flushed. The distance between the covering film and the upper surface fixed connection point of the covering structure on the surface of the landfill site and the weir body is larger than 1m, so that the direct impact of leachate water flow in the garbage pile on the fixed connection position is reduced, and the damage of the leachate water flow is prevented.
The utility model discloses a cover membrane on surface is connected with the good of rubbish dam limit anti-seepage membrane and reservoir bottom anti-seepage membrane, has adopted the linkage segment to make its trend form against the current with the leachate flow direction simultaneously in the junction for inside leachate can not ooze, and cofferdam inflow low reaches pipeline can be walked around to outside leachate, makes sewage can not influence the inboard construction environment of cofferdam. Even under the condition of a very complicated reservoir bottom, the excavated area on the inner side of the cofferdam relates to a leachate guide and discharge pipe, an underground water guide and discharge pipe and the like of a landfill site, and the inside and the outside of the cofferdam can be well isolated because the excavated area is arranged inside the cofferdam, so that cross pollution can not be generated.
Preferably, the covering structure on the surface of the landfill is a surface impermeable film, and the first connecting section of the covering film is welded with the surface impermeable film; the landfill bottom anti-seepage structure comprises a bottom anti-seepage film, and the second connecting section of the covering film is welded with the bottom anti-seepage film. Firm connection structures can be formed between the membrane materials through welding, so that a complete anti-seepage system is formed, and seepage pollution of seepage liquid is avoided.
Preferably, the landfill bottom seepage-proofing structure further comprises an auxiliary layer, a supporting layer and a groundwater diversion layer which are sequentially arranged from top to bottom. The supporting layer plays a good role in supporting the whole upper layer structure, and the structural stability is enhanced. The auxiliary layer can absorb a small amount of liquid which possibly flows in, and pollution of the auxiliary layer to the underground water system is reduced. The groundwater flows steadily in the groundwater flow guiding layer, will not impact the superstructure, and finally flows out.
Preferably, the auxiliary layer is bentonite, the supporting layer is clay, the thickness of the supporting layer ranges from 250 mm to 350mm, the underground water diversion layer is a gravel layer, the thickness of the underground water diversion layer ranges from 300mm to 500mm, and an underground water diversion pipe is further arranged in the underground water diversion layer.
Preferably, the covering film is an HDPE film, and the thickness of the HDPE film is 1.5-2.0 mm. HDPE films in the thickness range suitable have good water barrier effect.
Preferably, the weir body bottom still is equipped with the drainage layer, the drainage layer includes drainage net and the protective layer of top-down laminating. The leachate flowing out of the garbage pile body is blocked and absorbed to a certain extent through the drainage layer, so that the impact of the leachate on the cofferdam covering film is reduced.
Preferably, the drainage net is a composite geotechnical drainage net, the thickness of the composite geotechnical drainage net is 5-6 mm, the protective layer is geotechnical cloth, and the gram weight of the geotechnical cloth is 600-800g/m 2 。
Preferably, a leachate collecting pipe is arranged on one side, far away from the landfill, in the weir body. And after the leachate flows in the cofferdam, the leachate can be finally discharged through a leachate collecting pipe.
Preferably, the diameter of the leachate collecting pipe is 300 to 500mm.
Preferably, the weir body comprises a main body and a plurality of soil bags stacked on the main body, and the main body is cobblestones. The quantity and the stacking mode of the soil bags can be used for adjusting the height and the shape of the cofferdam, and the cofferdam is suitable for different construction positions and engineering requirements. The cofferdam body built by the cobblestones is convenient to construct, the leachate collecting pipe is simple to bury, and the subsequent process can be recycled.
Therefore, the utility model discloses following beneficial effect has: (1) The covering film is arranged on the surface of the cofferdam, and the covering film is fixedly connected with the landfill seepage-proofing structure, so that a good isolation effect is achieved on leachate flowing out of the garbage, and the pollution of the leachate to the inner side of the cofferdam is prevented; (2) The firm degree of the structure is enhanced by arranging the position and the direction of the fixed connection, and the cofferdam is prevented from being damaged by a large amount of leachate; (3) The cofferdam main body has simple structure, simple and convenient construction and reliable effect, and is particularly suitable for complex and difficult areas such as the vicinity of a landfill garbage dam.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Fig. 3 is a schematic structural diagram of the excavation process of the present invention.
In the figure: the landfill site comprises a landfill site surface covering structure 1, a landfill site bottom seepage-proofing structure 2, a bottom seepage-proofing film 21, an auxiliary layer 22, a supporting layer 23, a groundwater flow guiding layer 24, a groundwater flow guiding pipe 25, a weir body 3, a main body 31, a soil bag 32, a leachate collecting pipe 33, a leachate discharging net 34, a protective layer 35, a covering film 4, a first connecting section 41, a second connecting section 42 and landfill garbage 5.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Example 1
As shown in fig. 1 and 2, the anti-seepage structure for re-excavation of the domestic garbage landfill comprises a landfill surface covering structure 1 arranged at the upper part of a landfill 5, a landfill bottom anti-seepage structure 2 arranged at the lower part of the landfill and a cofferdam structure arranged at the side of the landfill, wherein the cofferdam structure comprises a weir body 3 and a covering film 4 arranged on the surface of the weir body, the height of the weir body is 1m, the weir body comprises a main body 31 and a plurality of soil bags 32 stacked on the main body, the main body is cobblestones, a leachate collecting pipe 33 is arranged at one side of the main body, which is far away from the landfill, the diameter of the leachate collecting pipe is 400mm, a drainage layer is further arranged at the bottom of the weir body, the drainage layer comprises a drainage net 34 and a protective layer 35 which are attached from top to bottom, the drainage net is a composite geotechnical drainage net, the thickness of the composite geotechnical drainage net is 5.5mm, the protective layer is a geotextile, and the grammage has a grammage of 800g/m 2 。
The landfill surface covering structure is a surface anti-seepage film, the landfill bottom anti-seepage structure comprises a bottom anti-seepage film 21, the covering film is a HDPE film with the thickness of 2.0mm, a first connecting section 41 and a second connecting section 42 are respectively arranged on two sides of the covering film, the first connecting section is bent towards the direction far away from the weir body, the first connecting section is welded with the upper surface of the surface anti-seepage film, the distance between the first connecting section and the weir body is larger than 1m, the second connecting section is bent towards the direction close to the weir body, and the second connecting section is welded with the upper surface of the bottom anti-seepage film.
Landfill bottom seepage prevention structure still includes auxiliary layer 22, supporting layer 23, groundwater diversion layer 24 that top-down set gradually, the auxiliary layer is the bentonite, the supporting layer is the clay, and the thickness of supporting layer is 300mm, groundwater diversion layer is the metalling, and groundwater diversion layer's thickness is 300mm, still is equipped with groundwater honeycomb duct 25 in the groundwater diversion layer.
As shown in fig. 3, in the leakage inspection construction process of the horizontal seepage control system at the bottom of the house refuse landfill, firstly, the excavation position is selected according to the operation requirement, the refuse buried nearby and the like are removed, and then cofferdams are arranged at the two sides of the excavation position. The cofferdam main body is formed by piling cobblestones, and a leachate guide pipe is buried in the cofferdam main body. The soil bags are arranged at the top of the main body, so that the height of the cofferdam is higher than that of a nearby garbage pile, rainwater and the like possibly mixed with leachate on the outer side of the cofferdam are separated outside the operation area, and finally the rainwater and the like are discharged through a downstream drain pipe. And then, paving an HDPE cover film on the surface of the cofferdam, respectively welding the cover film with the upper surface of the impermeable film on the surface of the landfill site and the upper surface of the impermeable film at the bottom of the landfill site to form a closed impermeable system, limiting leachate formed by landfill garbage and the like outside the weir body in the weir body, enabling the leachate to flow only inside the weir body, and finally flowing out through a leachate collecting pipe to prevent the pollution of the leachate to a construction area inside the cofferdam. The included angle direction between the covering film and the covering structure on the surface of the landfill site and the included angle direction between the covering film and the impermeable structure at the bottom of the landfill site are opposite to the flow direction of the leachate, so that the covering film and the impermeable structure are prevented from being fixedly connected and torn due to the fact that a large amount of leachate is flushed. The distance between the fixed connection point of the covering film and the upper surface of the covering structure on the surface of the landfill and the weir body is larger than 1m, so that the direct impact of leachate water flow in the garbage pile on the fixed connection position is reduced, and the garbage pile is prevented from being damaged. Even under the condition of a very complicated reservoir bottom, the excavated area on the inner side of the cofferdam relates to a leachate guide and discharge pipe, an underground water guide and discharge pipe and the like of a landfill site, and the inside and the outside of the cofferdam can be well isolated because the excavated area is arranged inside the cofferdam, so that cross pollution can not be generated.
Example 2
As shown in fig. 1 and 2, the seepage-proofing structure for re-excavation of the domestic garbage landfill comprises a landfill surface covering structure 1 arranged at the upper part of landfill garbage 5, a landfill bottom seepage-proofing structure 2 arranged at the lower part of the landfill garbage and a cofferdam structure arranged at the side of the landfill garbage, wherein the cofferdam structure comprises a weir body 3 and a covering film 4 arranged on the surface of the weir body, the height of the weir body is 1.2m, the weir body comprises a main body 31 and a plurality of soil bags 32 stacked on the main body, the main body is cobblestones, and the leachate collecting pipe is arranged on the main bodyThe diameter of 400mm, weir body bottom still is equipped with drainage layer, drainage layer includes drainage net 34 and protective layer 35 of top-down laminating, drainage net is compound geotechnological drainage net, the thickness of compound geotechnological drainage net is 5.5mm, the protective layer is geotechnological cloth, and the gram weight of geotechnological cloth is 800g/m 2 。
The landfill surface covering structure is a surface anti-seepage film, the landfill bottom anti-seepage structure comprises a bottom anti-seepage film 21, the covering film is a HDPE film with the thickness of 2.0mm, a first connecting section 41 and a second connecting section 42 are respectively arranged on two sides of the covering film, the first connecting section is bent towards the direction far away from the weir body, the first connecting section is welded with the upper surface of the surface anti-seepage film, the distance between the first connecting section and the weir body is larger than 1m, the second connecting section is bent towards the direction close to the weir body, and the second connecting section is welded with the upper surface of the bottom anti-seepage film.
The landfill bottom seepage-proofing structure further comprises an auxiliary layer 22, a supporting layer 23 and an underground water diversion layer 24 which are sequentially arranged from top to bottom, wherein the auxiliary layer is bentonite, the supporting layer is clay, the thickness of the supporting layer is 300mm, the underground water diversion layer is a gravel layer, and the thickness of the underground water diversion layer is 300mm.
When the utility model discloses an anti-seepage structure is used for landfill district excavation operation, can not include the leachate collecting pipe inside the cofferdam to do not include groundwater drainage guide pipe in the district among the district excavation process. The soil bags are arranged at the top of the main body, so that the height of the cofferdam is higher than that of the nearby garbage pile, rainwater and the like possibly mixed with leachate on the outer side of the cofferdam are blocked outside the operation area, and finally the rainwater and the like are discharged through a downstream drainage pipe. And then laying an HDPE cover film on the surface of the cofferdam, welding the cover film with the upper surface of the impermeable film on the surface of the landfill and the upper surface of the impermeable film at the bottom of the landfill to form a closed impermeable system, and limiting leachate formed by landfill garbage and the like on the outer side of the weir body in the weir body so that the leachate only flows in the weir body and finally flows out through a leachate collecting pipe to prevent the pollution to a construction area on the inner side of the cofferdam. The included angle direction between the covering film and the covering structure on the surface of the landfill site and the included angle direction between the covering film and the impermeable structure at the bottom of the landfill site are opposite to the flow direction of the leachate, so that the covering film and the impermeable structure are prevented from being fixedly connected and torn due to the fact that a large amount of leachate is flushed into the covering film. The distance between the fixed connection point of the covering film and the upper surface of the covering structure on the surface of the landfill and the weir body is larger than 1m, so that the direct impact of leachate water flow in the garbage pile on the fixed connection position is reduced, and the garbage pile is prevented from being damaged.
Claims (10)
1. The anti-seepage structure comprises a landfill surface covering structure (1) arranged on the upper portion of a landfill body (5), a landfill bottom anti-seepage structure (2) arranged on the lower portion of the landfill body and a cofferdam structure arranged on the side face of the landfill, wherein the cofferdam structure comprises a weir body (3) and a cover film (4) arranged on the surface of the weir body, the height of the weir body is 1 to 1.2m, a first connecting section (41) and a second connecting section (42) are respectively arranged on two sides of the cover film, the first connecting section bends towards the direction away from the weir body, the first connecting section is fixedly connected with the landfill surface covering structure, the distance between the first connecting section and the weir body is larger than 1m, the second connecting section bends towards the direction close to the weir body, and the second connecting section is fixedly connected with the upper surface of the landfill bottom structure.
2. The anti-seepage structure for the re-excavation of the household garbage landfill site as claimed in claim 1, wherein the landfill site surface covering structure is a surface anti-seepage film, and the first connecting section of the covering film is welded with the surface anti-seepage film; the landfill bottom anti-seepage structure comprises a bottom anti-seepage film (21), and the second connecting section of the covering film is welded with the bottom anti-seepage film.
3. The seepage-proofing structure for the re-excavation of the household garbage landfill site as claimed in claim 1, wherein the seepage-proofing structure at the bottom of the landfill site further comprises an auxiliary layer (22), a supporting layer (23) and a groundwater diversion layer (24) which are sequentially arranged from top to bottom.
4. The seepage-proofing structure for the re-excavation of the household garbage landfill site as claimed in claim 3, wherein the auxiliary layer is bentonite, the supporting layer is clay, the thickness of the supporting layer is 250 to 350mm, the underground water diversion layer is a gravel layer, the thickness of the underground water diversion layer is 300 to 500mm, and an underground water diversion pipe (25) is further arranged in the underground water diversion layer.
5. The impervious structure for the re-excavation of the household garbage landfill site as claimed in claim 1, wherein the cover film is an HDPE film, and the thickness of the HDPE film is 1.0-2.0 mm.
6. The seepage-proofing structure for the re-excavation of the household garbage landfill site as claimed in claim 1, wherein the bottom of the weir body is further provided with a drainage layer, and the drainage layer comprises a drainage net (34) and a protective layer (35) which are attached from top to bottom.
7. The seepage-proofing structure for the re-excavation of the household garbage landfill site as claimed in claim 6, wherein the drainage net is a composite geotechnical drainage net, the thickness of the composite geotechnical drainage net is 5-6 mm, the protective layer is geotechnical cloth, and the gram weight of the geotechnical cloth is 600-800g/m 2 。
8. The seepage-proofing structure for the re-excavation of the household garbage landfill site as claimed in claim 1, wherein a leachate collecting pipe (33) is arranged at one side of the interior of the weir body far away from the landfill garbage.
9. The seepage-proofing structure for the re-excavation of the household garbage landfill site as claimed in claim 8, wherein the diameter of the leachate collecting pipe is 300-500mm.
10. The seepage prevention structure for the re-excavation of the municipal solid waste landfill as claimed in claim 1, wherein the weir body comprises a main body (31) and a plurality of soil bags (32) stacked on the main body, and the main body is cobblestone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221530560.4U CN218492566U (en) | 2022-06-17 | 2022-06-17 | A seepage prevention structure for domestic waste landfill is excavated once more |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221530560.4U CN218492566U (en) | 2022-06-17 | 2022-06-17 | A seepage prevention structure for domestic waste landfill is excavated once more |
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