CN216865196U - Sealing covering structure of municipal solid waste landfill - Google Patents
Sealing covering structure of municipal solid waste landfill Download PDFInfo
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- CN216865196U CN216865196U CN202220164160.XU CN202220164160U CN216865196U CN 216865196 U CN216865196 U CN 216865196U CN 202220164160 U CN202220164160 U CN 202220164160U CN 216865196 U CN216865196 U CN 216865196U
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Abstract
The utility model discloses a sealing covering structure of an urban domestic garbage landfill. Belonging to the field of urban pollutant treatment; comprises a garbage layer, an isolation layer, an air conduction layer, an anti-seepage layer, an on-film protective layer, a drainage layer, a support soil layer, a nutrient vegetable layer and a planting layer; the garbage layer is trimmed and leveled by mixing garbage with sand; the isolating layer is 2 layers of non-woven geotextiles; the air guide layer is a crushed stone blind ditch which is paved at intervals of 30m and has the thickness of 400 mm; the impermeable layer is a 2-layer GCL bentonite blanket; the protective layer on the membrane is compacted clay with the thickness of more than or equal to 300 mm; the drainage layer is a geotechnical composite drainage network; the supporting soil layer is compacted clay with the thickness of 500 mm; the nutrient soil planting layer is nutrient planting soil with the thickness of more than or equal to 300 mm; the vegetation layer is covered with vegetation. The utility model has simple structure, better durability and good anti-seepage effect; the long-term effectiveness can be kept after the field sealing project is finished so as to be reused.
Description
Technical Field
The utility model belongs to the field of urban pollutant treatment, relates to a novel field sealing covering technology of an urban domestic garbage landfill, and particularly relates to a field sealing covering structure of an urban domestic garbage landfill.
Background
Through the rapid development of more than forty years in cities in China, the urbanization achieves remarkable effect, but with the continuous expansion of city construction scale and the rapid increase of urban population, more and more urban waste sites begin to appear, and how to solve the negative effects of waste sites on cities becomes a problem which is generally faced by various cities and needs to be solved urgently. The urban refuse landfill is used as a special urban waste land, not only occupies a large amount of land resources, but also causes serious damage to the ecology in the surrounding areas, and brings huge resistance to the civilized construction of the urban ecology.
The sealing covering system of the refuse landfill has the basic functions of isolating refuse from the environment, and effectively preventing the odor of the refuse from diffusing and the rainwater from leaking through a series of engineering technical means, such as slope trimming, disinfection of the refuse landfill area, leachate treatment, landfill gas guiding and discharging and the like, ensuring the air and drinking water safety of surrounding residents and recovering the land ecological function. Plays an important role in soil restoration, ecological environment improvement and beautiful landscape building on the field, gradually recovers or rebuilds the damaged ecosystem of the original field, and finally forms an ecosystem with stable structure and rich functions.
At present, the sealing construction of the municipal refuse landfill is mostly carried out by adopting simple sealing treatment, the sealing construction technology is uneven, and the site safety and the later ecological restoration quality of the municipal refuse landfill are directly restricted. How to systematically and efficiently improve the sealing covering method of the municipal solid waste landfill and reduce the construction cost is an important problem in the current organization construction; the research on how to optimize and perfect the construction method of the municipal solid waste landfill is not comprehensive at present, and a set of complete technical system and operation flow are not formed.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims to provide a sealing cover structure of an urban domestic garbage landfill, which is used for improving the engineering technical measures of a sealing cover system of the urban garbage landfill.
The technical scheme is as follows: the utility model relates to a sealing covering structure of an urban domestic garbage landfill, which comprises a garbage landfill,
the structure from bottom to top of seal covering structure includes in proper order: the garbage layer, the isolation layer, the air conduction layer, the anti-seepage layer, the on-film protective layer, the drainage layer, the support soil layer, the nutrient soil planting layer and the vegetation layer.
Furthermore, the range of the closing cover system of the refuse landfill is based on the range of refuse obtained by investigation, and the range is expanded by 10-15 m.
Furthermore, the garbage layer needs to be trimmed and leveled by mixing garbage with sand; the isolation layer is 2 layers of laid non-woven geotextiles.
Further, the air guide layer is a crushed stone blind ditch which is arranged at intervals of 30m and has a thickness of 400mm, and the width of the blind ditch is 0.6 m.
Further, the impermeable layer is a 2-layer GCL bentonite blanket.
Furthermore, the protective layer on the membrane is compacted clay with the thickness of more than or equal to 300 mm.
Further, the drainage layer is a geotechnical composite drainage network.
Further, the supporting soil layer is compacted clay with the thickness of 500 mm.
Furthermore, the nutrient soil planting layer is nutrient soil with the thickness of more than or equal to 300 mm.
Furthermore, the vegetation layer adopts a planting and covering mode.
Has the advantages that: compared with the prior art, the utility model has the characteristics that 1, the utility model can lead the covering layer system to be stable for a long time, can keep long-term effectiveness after the sealing project is finished, is convenient for better carrying out the site reutilization in the later period, has complete technical system and is safe to construct; 2. the utility model has simple structure and convenient construction; the durability is better, the anti-seepage effect is good, the construction effect is reliable, and the service life is longer.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the operation of an embodiment of the present invention;
wherein: 1 is the rubbish layer, 2 is the isolation layer, 3 is the air guide layer, 4 is the barrier layer, 5 is the epimembranal protective layer, 6 is the drainage blanket, 7 is the support soil layer, 8 is nutrition planting soil layer, 9 is the vegetable layer.
Detailed Description
The utility model is further described below with reference to the following figures and specific examples.
As shown in the figure, the sealing covering structure of the municipal solid waste landfill comprises a waste landfill;
the structure from bottom to top of seal covering structure includes in proper order: the garbage layer 1, the isolation layer 2, the air conduction layer 3, the impermeable layer 4, the protective layer 5 on the membrane, the drainage layer 6, the support soil layer 7, the nutrient soil planting layer 8 and the vegetation layer 9.
Furthermore, the range of the closing cover system of the refuse landfill is based on the range of refuse obtained by investigation, and the range is expanded by 10-15 m.
Furthermore, the garbage layer 1 needs to be trimmed and leveled by mixing garbage with sand; the isolation layer 2 is a laid 2-layer non-woven geotextile.
Further, the air guide layer 3 is a crushed stone blind ditch with the interval of 30m and the laying thickness of 400mm, and the width of the blind ditch is 0.6 m.
Further, the impermeable layer 4 is a 2-layer GCL bentonite blanket.
Further, the protective layer 5 on the membrane is compacted clay with the thickness of more than or equal to 300 mm.
Further, the drainage layer 6 is a geotechnical composite drainage network.
Further, the supporting soil layer 7 is compacted clay with a thickness of 500 mm.
Furthermore, the nutrient soil planting layer 8 is nutrient soil with the thickness of more than or equal to 300 mm.
Further, the vegetation layer 9 is covered by planting.
The method comprises the following specific operation steps:
the specific operation flow is as follows:
1. before the landfill site is sealed, safety evaluation is carried out on the site; after a clear environmental risk conclusion is obtained, detailed field sealing treatment is carried out;
2. taking the range of the garbage obtained by reconnaissance as a reference according to the range of a sealing cover system, and properly expanding the range by 10-15 m; the sealing covering structure is sequentially divided into a garbage layer 1, an isolation layer 2, an air conduction layer 3, an anti-seepage layer 4, an upper membrane protection layer 5, a drainage layer 6, a supporting soil layer 7, a nutrient soil planting layer 8 and a vegetation layer 9 from bottom to top, and sequentially organized and laid (as shown in figure 1);
3. firstly, carrying out leveling treatment on a garbage pile, wherein a layered excavation mode, a layered stacking mode and a layered backfill mode are adopted in the construction excavation process; under the condition of ensuring the stability of the garbage heap, the garbage heap is carried out layer by layer from top to bottom, the whole excavation operation surface is ensured to be wide and ventilated, the excavation and cutting thickness requirement of each time is not more than 0.8m, the bottom garbage is treated by sand mixing and compaction after the adjustment is finished, the garbage heap rolling is carried out repeatedly according to the sequence of firstly raising and then compacting, preferably 3-4 times, and the density of the heap after compaction is ensured to be more than 1.0t/m3；
4. Shaping the slope surface and the field top area with the gradient slower than 1:3 by combining the characteristics of the landfill dump body in a small amount of cutting and filling, and leveling, compacting and balancing as much as possible; when the side slope of the garbage pile body is steeper than 1:3, the slope body is subjected to descending and steep shaping treatment, the construction of the slope body mainly comprises digging, transporting, filling and pressing, and pushing and moving are assisted, so that the slope surface is stable after the garbage pile body is shaped, garbage is fully compacted, and the slope surface is flat and has no concave surface;
5. a layer of non-woven geotextile is laid on the surface layer of the leveled and compacted garbage pile to isolate solid garbage from the garbage pile, the flat laying is required, no folds or bends are generated, the dragging is reduced as much as possible during the laying, and the mechanical damage is avoided;
6. drilling a vertical landfill gas collecting well to the garbage pile in a field area, paving a macadam blind ditch with the thickness of 300mm on the surface layer at intervals of 30m, wherein the width of the blind ditch is 0.6m, a perforated pipe with the diameter of 160mm is arranged in the blind ditch, and after the blind ditch is connected to a landfill gas conveying main pipe, the macadam blind ditch is directly conveyed to a landfill gas combustion torch for centralized treatment; the gas in the refuse landfill is effectively collected and discharged, so that the damage of the gas pressure to an upper sealing covering system is avoided; wherein the vertical landfill gas collecting wells are uniformly distributed along the side slope, and the landfill gas conveying main pipe is communicated along the whole line of the side line of the garbage pile body, so as to ensure that the waste gas is smoothly communicated with a combustion torch (shown in figure 2);
7. laying 2 layers of bentonite blankets as an anti-seepage layer 4, wherein the laying of the bentonite blankets is a key step for solving the problems of sealing, isolating and anti-seepage, the laying process ensures that the bentonite blankets are tiled and straightened, and are smooth, wrinkle-free or bending-free, and the dragging of the bentonite blankets on the foundation is reduced as much as possible during laying, so that the mechanical damage is avoided; overlapping the tail ends of the two bentonite blankets in an overlapping process, wherein the longitudinal overlapping length is required to be not less than 150mm, the transverse overlapping length is required to be not less than 600mm, and the bentonite blankets are completely covered on the ground without gaps to prevent soft soil or broken stones from entering an overlapping area;
8. paving compacted clay as an upper membrane protective layer 5 on the completely paved bentonite blanket, wherein the clay thickness is required to be not less than 300mm, the clay particles are required to be less than 25mm, and soil which is easy to damage the bentonite blanket, such as angular stones, is not suitable to be used; during construction on a slope, backfill soil should be placed from bottom to top so as to reduce pressure acting on the bentonite blanket;
9. after the compacted clay is leveled, laying a geotechnical composite drainage network as a drainage layer 6 of a sealing cover system of the refuse landfill; the upper part of the geotechnical composite drainage net is anchored in a safety anchoring ditch above a slope, and the material coil is paved downwards along the slope to ensure that the drainage direction of the drainage net is consistent with the water flow direction; the geotechnical composite drainage network on the slope uses material rolls with complete length, and the overlapping in the width direction is avoided as much as possible; during laying, wrinkles and creases are avoided as much as possible, the construction surface is inspected after installation is finished, and objects which may penetrate through the geotextile are cleaned;
10. after the drainage layer is finished, continuously paving 500mm of compacted clay as a supporting soil layer 7 covered by the system, and paving a last layer of 300mm of nutrient soil as a field for ecological restoration and vegetation planting in the later period of the landfill site after compaction is finished;
11. finally, vegetation is covered and planted 9 on the nutrient soil planting layer 8, if large and medium trees are planted, the terrain should be built locally, the terrain is raised, the depth of the planting nutrient soil layer is ensured to be larger than 1.2m, the vegetation type is mainly selected from native plants, and coordination of the field environment and the surrounding ecological environment is promoted; an environment-deformation monitoring unit is arranged in the field area, and an automatic monitoring device and a data acquisition system are utilized to realize the monitoring of the sealing covering layer system, so that the automatic real-time monitoring of the whole field area is realized.
Examples
Step one, sealing and covering an early stage of a refuse landfill:
(1) and project site:
the project is located in the north of a certain city, the temple road above south, the road from north to shozhuang, the thin west lake road in west, the road from east to Hongfu village and Yuren roads (119.45E,32.43N), the east-west span is about 600m, the south-north span is about 435m, and the total floor area is about 30 ten thousand m2。
(2) And overview of the place before closing:
the site is dirty before the site is closed and covered, the garbage accumulation is as high as 7-15m, the ecological system is seriously degraded, the soil is poor, the ecology is fragile, and the self-renewal capability of the environment is lost.
(3) And safety evaluation of the site:
firstly, comprehensively detecting and evaluating the stability and harmful substances of an original garbage pile body of a field, and comprehensively sealing the garbage pile body of the field according to a detection result; the terraced fields are transformed by combining unique terrain conditions, and the slope toe parts are properly slowed down, so that the stability and the safety of the field are improved;
step two, building a sealing covering system of the refuse landfill:
(1) excavating earthwork and leveling garbage:
on the premise of safety evaluation of a site, carrying out earth excavation operation; in the construction excavation process, spraying deodorization facilities are arranged on an excavation working face and a discharging position in a layered excavation, layered stacking and layered backfilling mode to control odor and raised dust; excavating and cutting are carried out layer by layer from top to bottom, so that the whole excavation working face is ensured to be wide and ventilated, and a dangerous space is prevented from being formed locally; the digging and cutting thickness is not more than 0.8m each time, and the thrown and cut garbage is timely transported to the top area of the field or the slope toe is filled in a layered manner; the bottom layer garbage is compacted by sand mixing, the garbage heap body is repeatedly compacted for 3-4 times according to the sequence of top to bottom, and the density of the heap body after compaction is ensured to be more than 1.0t/m3. The waste slag earthwork generated in the construction process is selected to be reasonably buried or stacked, and is timely transported away after the construction is finished.
(2) And side slope finishing:
and shaping the slope surface and the field top area with the gradient slower than 1:3 by combining the characteristics of the landfill dump body in a small amount of cutting and filling, so as to level, compact and balance as much as possible. When the side slope of the garbage pile body is steeper than 1:3, the slope body is subjected to steep descending shaping treatment based on safety consideration, the construction process mainly comprises digging, transporting, filling and pressing, and pushing and moving are assisted, so that the slope surface is stable after the garbage pile body is shaped, garbage is fully compacted, and the slope surface is smooth and has no concave surface; in addition, the space built by sealing facilities such as garbage leachate, slope rainwater collection and discharge, gas reverse discharge and the like of the whole pile body is also considered for slope trimming;
(3) and a seal covering system:
combining special projects such as leachate drainage of a landfill, performing covering treatment on the garbage mountain from bottom to top, and sealing and covering sequentially for stirring, leveling and finishing the garbage (garbage layer 1) and 400g/m2Nonwoven geotextile(the isolation layer 2) isolating, arranging 400 mm-thick crushed stones with the width of 0.6m on the surface layer at an interval of 30m as an air guide layer 3, arranging a De160 HDPE perforated pipe in the air guide layer, connecting the air guide layer to a landfill gas conveying main pipe, directly conveying the air guide layer to a landfill gas combustion torch, and performing concentrated combustion treatment; then 2 layers of 4800g/m are paved2The method comprises the following steps of constructing an impermeable layer 4 by specification GCL bentonite blanket, paving compacted clay with the thickness of 300mm on the impermeable layer as an upper membrane protective layer 5, paving a drainage layer 6 of a 6.3mm geotechnical composite drainage network construction system, paving a compacted clay layer (a support soil layer 7) with the thickness of 500mm on the drainage layer, and finally covering nutrient soil with the thickness of more than 300mm to carry out vegetation planting coverage (a nutrient soil planting layer 8 and a vegetation layer 9);
step three, ecological restoration and safety monitoring:
the plant landscape is combined with the small building products to build the site landscape, and nearly hundreds of arbor and shrub plants with strong ecological adaptability and strong resistance are used in the site transformation process; a perfect small-sized ecological system is formed, the ornamental effect is beautiful, the construction is safe, and the construction period is shortened.
Setting an environment-deformation monitoring unit in the field area, and distributing points according to the principle of taking an environment function area as a main consideration and taking uniformity into consideration; the monitoring of the sealing covering layer system is realized by utilizing automatic monitoring equipment and a data acquisition system, the system sends monitoring data to a management platform in real time, and the automatic real-time monitoring of the whole field area is realized.
The utility model has the advantages that each link for setting up the sealing and covering system of the refuse landfill is tightly connected without disjunction, and the operability is strong; in addition, the utility model optimizes the sealing treatment technology of the domestic garbage landfill, improves the construction efficiency and the safety performance of the site and reduces the cost.
The above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described examples. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention may be apparent to those skilled in the relevant art and are intended to be within the scope of the present invention.
Claims (10)
1. The utility model provides a field closing covering structure of city domestic waste landfill, includes the refuse landfill, its characterized in that:
the structure from bottom to top of seal covering structure includes in proper order: the garbage layer, the isolation layer, the air conduction layer, the anti-seepage layer, the on-film protective layer, the drainage layer, the support soil layer, the nutrient soil planting layer and the vegetation layer.
2. The sealing covering structure of the municipal solid waste landfill according to claim 1, wherein:
the range of the sealing covering system of the refuse landfill is based on the range of refuse obtained by investigation, and the range is expanded by 10-15 m.
3. The field closing covering structure of the municipal solid waste landfill according to claim 1, characterized in that:
the garbage layer is trimmed and leveled by mixing garbage with sand; the isolation layer is 2 layers of laid non-woven geotextiles.
4. The field closing covering structure of the municipal solid waste landfill according to claim 1, characterized in that:
the air guide layer is a crushed stone blind ditch which is arranged at intervals of 30m and has the thickness of 400mm, and the width of the blind ditch is 0.6 m.
5. The sealing covering structure of the municipal solid waste landfill according to claim 1, wherein:
the barrier layer is a 2-layer GCL bentonite blanket.
6. The sealing covering structure of the municipal solid waste landfill according to claim 1, wherein:
the protective layer on the membrane is compacted clay with the thickness of more than or equal to 300 mm.
7. The field closing covering structure of the municipal solid waste landfill according to claim 1, characterized in that:
the drainage layer is a geotechnical composite drainage network.
8. The sealing covering structure of the municipal solid waste landfill according to claim 1, wherein:
the supporting soil layer is compacted clay with the thickness of 500 mm.
9. The sealing covering structure of the municipal solid waste landfill according to claim 1, wherein:
the nutrient soil planting layer is nutrient soil with the thickness of more than or equal to 300 mm.
10. The sealing covering structure of the municipal solid waste landfill according to claim 1, wherein: the vegetation layer is covered by planting.
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| CN115467342A (en) * | 2022-07-08 | 2022-12-13 | 广西交科集团有限公司 | Greening slope protection system for poor soil slope and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115467342A (en) * | 2022-07-08 | 2022-12-13 | 广西交科集团有限公司 | Greening slope protection system for poor soil slope and construction method |
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Denomination of utility model: A Sealing and Covering Structure for Urban Domestic Waste Landfill Effective date of registration: 20230829 Granted publication date: 20220701 Pledgee: China CITIC Bank Co.,Ltd. Yangzhou Branch Pledgor: Yangzhou garden Co.,Ltd. Registration number: Y2023320000450 |
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Granted publication date: 20220701 Pledgee: China CITIC Bank Co.,Ltd. Yangzhou Branch Pledgor: Yangzhou garden Co.,Ltd. Registration number: Y2023320000450 |