Waste landfill site having inner working road made of household wastes

Abstract

A waste landfill equipped with an internal work road constructed of household waste is disclosed. The waste landfill comprises: two or more waste landfill layers (42a, 42b) whose size decreases toward the top; an outer embankment (50a, 50b) surrounding the edges of the waste landfill layers (42a, 42b); a cover layer (44a, 44b) laid on top of the waste landfill layers (42a, 42b) to block the waste landfill layers (42a, 42b) from the outside; and an inner embankment (60a, 60b) constructed of household waste, which divides the internal landfill sections of each waste landfill layer (42a, 42b) into a plurality of separated areas inside the outer embankment (50a, 50b). It includes a road body (62a, 62b) that forms the foundation structure of an internal work road formed on the inner embankment (60a, 60b) of each section, which is laid on the upper part of the inner embankment (60a, 60b) to prevent external exposure of the inner embankment (60a, 60b) and to induce scattering of household waste and odor reduction; and a road pavement section (64a, 64b) that is formed on the upper part of the road body (62a, 62b) and provides a movement path for work vehicles.

Description

Technology Field

[0001] The present invention relates to a waste landfill, and more specifically, to a waste landfill equipped with an internal work road constructed of household waste. Background Technology

[0002] A waste landfill is a site for burying household waste generated during daily life, industrial waste generated at industrial sites, and construction waste generated at construction sites. It is operated by the government, local governments, and other entities, and its scale varies depending on the volume of waste accepted. Generally, the waste disposal method using 'landfill' involves stacking waste to a certain height and covering the stacked waste with a barrier material (referred to as a 'covering layer'), such as soil with low permeability, solidified materials, or soil recycled from construction waste, thereby allowing the waste to decompose naturally. For example, a waste landfill is formed by burying waste to a height of approximately 4.5 m and then repeating the process of forming a covering layer of approximately 50 cm on top of it 5 to 10 times to create a waste landfill 25 to 50 m high. The aforementioned covering layer serves to prevent waste from being blown away, odor emission, and the habitation of pests or rodents. During the natural decomposition process of the aforementioned waste, leachate and landfill gas are generated, and leachate collection and drainage facilities, as well as landfill gas capture and transport facilities, are installed at the waste landfill to discharge these substances. Additionally, if a large amount of rainwater flows into the landfill during the rainy season, not only does the volume of leachate increase excessively, but the landfill ground also becomes vulnerable; therefore, rainwater drainage facilities are sometimes constructed at the waste landfill to discharge rainwater into rivers or other waterways outside the landfill.

[0003] For the installation and management of such waste landfills and other facilities, each layer of waste is divided into multiple sections by an internal embankment, and the internal embankment also serves as a passageway for work vehicles, i.e., an internal work road. A method for constructing such internal embankments and internal work roads using construction waste is disclosed in Korean Patent Registration No. 10-0739417. FIG. 1 is a drawing showing the cross-sectional state of a conventional waste landfill equipped with an internal road constructed using construction waste. As shown in FIG. 1, a conventional waste landfill comprises waste landfill layers (22a, 22b) stacked in two or more layers; and a cover layer (24a, 24b) laid on top of each waste landfill layer (22a, 22b) to block the waste landfill layers (22a, 22b) from the outside. It includes an inner embankment (30a, 30b) made of construction waste or soil that partitions the landfill section of each of the above-mentioned waste landfill layers (22a, 22b); a road body (32a, 32b) formed on the upper part of the inner embankment (30a, 30b); and a road pavement section (34a, 34b) formed on the upper part of the road body (32a, 32b) to provide a movement path for work vehicles.

[0004] The above inner embankments (30a, 30b) divide the landfill section of the waste landfill layer (22a, 22b) into multiple areas and serve as access roads installed to allow work vehicles to enter and exit the waste landfill layer (22a, 22b), and are formed before the waste landfill in the said waste landfill layer (22a, 22b) (this is referred to as "pre-construction"). That is, each waste landfill layer (22a, 22b) is formed as waste is landfilled in the space divided by the pre-constructed inner embankments (30a, 30b). Since the waste landfill layer (22a, 22b) has a multi-stage landfill structure, for example, a lower inner embankment (30a) is formed in the lower waste landfill layer (22a), and an upper inner embankment (30b) is formed in the upper waste landfill layer (22b).

[0005] Due to recent changes in environmental policies, the volume of construction waste brought in has been continuously decreasing, and as the ratio of construction waste brought in has also changed, it has become difficult to separate and landfill waste by type (construction waste, household waste, etc.). In addition, if construction waste is not brought in at the appropriate time, it becomes impossible to construct internal roads (main roads) before the start of landfill operations in each waste landfill layer (22a, 22b), which increases the difficulty in carrying out planned landfill operations, such as securing roads for waste transport vehicles and organizing the landfill area. Furthermore, when the internal embankment (30a, 30b) is constructed with construction waste or soil and household waste is landfilled in the waste landfill layer (22a, 22b), differential settlement occurs between the internal embankment (30a, 30b) and the waste landfill layer (22a, 22b) due to the difference in the construction materials, and cracks may occur in the waste landfill. Therefore, there is an increasing need for technology to improve the problems of existing internal work road construction methods and for efficient and stable landfill operation and management. Prior art literature

[0006] Patent Registration No. 10-0739417 The problem to be solved

[0007] The objective of the present invention is to provide a waste landfill capable of efficient and stable operation and management by constructing internal working roads using municipal solid waste.

[0008] Another objective of the present invention is to construct an internal working road using municipal solid waste to prevent differential settlement between soil and waste and differential settlement at the boundary between the internal embankment and the waste landfill layer, thereby forming a structurally stable waste landfill and providing a waste landfill capable of reducing landfill costs and maximizing landfill capacity. means of solving the problem

[0009] To achieve the above objective, the present invention comprises: two or more waste landfill layers (42a, 42b) whose size decreases toward the top; an outer embankment (50a, 50b) surrounding the edges of the waste landfill layers (42a, 42b); a backfill layer (44a, 44b) laid on top of the waste landfill layers (42a, 42b) to block the waste landfill layers (42a, 42b) from the outside; and an inner embankment (60a, 60b) constructed of household waste, which divides the internal landfill sections of each waste landfill layer (42a, 42b) into a plurality of separated areas, inside the outer embankment (50a, 50b). A waste landfill is provided comprising: a road body (62a, 62b) that is laid on the upper part of each inner embankment (60a, 60b) to prevent external exposure of the inner embankment (60a, 60b) and to induce scattering of household waste and odor reduction, and which forms the foundation structure of an inner work road formed on the inner embankment (60a, 60b); and a road pavement section (64a, 64b) that is formed on the upper part of the road body (62a, 62b) and provides a movement path for work vehicles. Effects of the invention

[0010] According to the waste landfill of the present invention, internal access roads are constructed using household waste, thereby enabling efficient and stable operation and management of the landfill. Furthermore, according to the present invention, by preventing differential settlement between soil and waste and differential settlement at the boundary between the internal embankment and the waste landfill layer, a structurally stable waste landfill is formed, thereby reducing landfill costs and maximizing landfill capacity. Brief explanation of the drawing

[0011] FIG. 1 is a drawing showing the cross-sectional state of a conventional waste landfill equipped with an internal road constructed using construction waste. FIGS. 2 and 3 are a plan view and a cross-sectional view of a waste landfill having an internal work road constructed of municipal solid waste according to one embodiment of the present invention. FIG. 4 is a cross-sectional view (A) and a plan view (B) showing a state in which a subsidence pin is installed to detect subsidence of an internal work road in a waste landfill according to one embodiment of the present invention. Specific details for implementing the invention

[0012] The present invention will be described in more detail below with reference to the attached drawings.

[0013] FIGS. 2 and 3 are a plan view and a cross-sectional view of a waste landfill having an internal work road constructed of household waste according to an embodiment of the present invention, respectively. As shown in FIGS. 2 and 3, the waste landfill according to an embodiment of the present invention comprises: two or more waste landfill layers (42a, 42b) whose size decreases toward the top; an outer embankment (50a, 50b) surrounding the edges of the waste landfill layers (42a, 42b); and a cover layer (44a, 44b) laid on top of the waste landfill layers (42a, 42b) to block the waste landfill layers (42a, 42b) from the outside.

[0014] The outer embankments (50a, 50b) form the outer boundary of the landfill surrounding the waste landfill space of each tier. When waste (42a, 42b) is landfilled in multiple tiers, after the landfilling of the lower waste (42a) is completed, the upper outer embankment (50b) is constructed on top of the lower waste landfill layer (42a) at a certain distance from the edge to form the upper waste (42b) landfill space. The outer embankments (50a, 50b) are constructed after reviewing the stability of the entire landfill slope and the stability of the cross-section of the earth embankment construction, and are typically formed to have an inner slope of 1:1.5 and an outer slope of 1:2 (refer to Patent Registration No. 10-0739417).

[0015] The above waste landfill layers (42a, 42b) accommodate various types of waste, such as household waste and construction waste, and preferably accommodate household waste. The height of the waste layers (42a, 42b) landfilled in one layer varies depending on the overall operation plan of the landfill, but is typically 4.0 to 5.0 m.

[0016] The above-mentioned covering layer (44a, 44b) is laid on top of each layer of waste landfill (42a, 42b) to prevent external exposure of the landfilled waste (42a, 42b) and to induce waste scattering and odor reduction, and is also referred to as an intermediate covering layer (44a, 44b). The above-mentioned covering layer (44a, 44b) is laid at a slope of typically 2 to 4% from the landfill point toward the boundary surface with the outer embankment (50a, 50b) or the inner embankment (60a, 60b) so that leachate, rainwater, etc. can flow smoothly. The above-mentioned covering layer (44a, 44b) is typically formed of high-quality soil with low permeability and is laid to a thickness greater than a certain thickness to facilitate compaction for consolidation of the landfilled waste (42a, 42b) and the movement of equipment. For example, considering compaction, equipment mobility, and economic efficiency, it is laid to a thickness of 30 to 60 cm.

[0017] Inside the outer embankment (50a, 50b), a road body (62a, 62b) is formed on top of the inner embankment (60a, 60b) of each stage to divide the inner landfill section of each stage waste landfill layer (42a, 42b) into multiple separated areas, prevent the outer exposure of the inner embankment (60a, 60b) constructed of household waste, and induce scattering and odor reduction of household waste. The road body (62a, 62b) forms the foundation structure of the road formed on the inner embankment (60a, 60b), and a road pavement section (64a, 64b) is formed on top of the road body (62a, 62b) to provide a movement path for work vehicles. The above roadbed (62a, 62b) is typically formed with ordinary soil to a thickness of about 100 cm, and the road pavement (64a, 64b) is formed with recycled aggregate to a thickness of about 50 cm and is also referred to as a “sub-base layer.” The roadbed (62a, 62b) and the road pavement (64a, 64b) formed on the upper part of the above inner embankment (60a, 60b) serve as a passageway for waste transport vehicles and support the waste transport vehicles so that they can move stably, thereby preventing damage to the inner work road.

[0018] In the waste landfill according to the present invention, the inner embankment (60a, 60b) is formed from household waste. Waste is classified into 'household waste' and 'industrial waste' in accordance with the Waste Management Act. "Household waste" refers to waste other than industrial waste, and "industrial waste" refers to waste generated from workplaces that install and operate emission facilities in accordance with the Air Environment Conservation Act, the Water Environment Conservation Act, or the Noise and Vibration Management Act, workplaces that install and operate public wastewater treatment facilities, public sewage treatment facilities, manure treatment facilities, or public livestock manure treatment facilities, workplaces that install and operate waste treatment facilities in accordance with Article 29, Paragraph 2 of the Waste Management Act, workplaces that discharge designated waste, workplaces that discharge an average of 300 kg or more of waste per day, workplaces that discharge 5 tons or more of waste through construction work, or workplaces that discharge 5 tons or more of waste through a series of construction or work. In the present specification, the household waste used for the construction of the inner embankment (60a, 60b) refers to waste other than industrial waste, such as waste generated in households, etc., and waste generated in less than 5 tons from a series of construction or work. For example, among the household waste, household and industrial household waste refers to household waste contained in volume-based waste bags.

[0019] As illustrated in FIG. 3, the inner embankment (60b) includes an upper surface (70) formed substantially horizontally in the center and slopes (72) formed inclinedly on both sides of the upper surface (70). Although slope stability is secured when the slopes of the inner embankment (60b) constructed from household waste have a slope of 1:2.8 (height: base length) or greater, considering the risk of vehicle overturning due to differential settlement of the inner embankment (60b), road body (62b), and road pavement (64b), it is preferable that the slope of the slopes (72) of the inner embankment (60b) be 1:3.0 or greater.

[0020] The height of the road body (62b) formed on the upper part of the inner embankment (60b) is approximately the same as the height of the waste landfill layer (42b) to be landfilled, and is typically formed with a thickness of 0.5 to 2 m using ordinary soil. Here, if the thickness of the road body (62b) is too small, there is a concern that vehicle driving stability may not be secured, and if the thickness is too large, not only is the landfill capacity for household waste reduced, but costs are also unnecessarily increased. The slope of the road body (62b) is formed to be similar to the slope of the inner embankment (60b).

[0021] The above road pavement (64b) is formed on the upper surface (70) of the inner embankment (60b) using ordinary aggregate with a thickness of 0.5 to 1 m, and it is preferable to have a longitudinal gradient of 0.5 to 5%, for example, 4%, from the center as the apex toward the left and right outer edges for rainwater drainage. In addition, it is preferable to form a clearance space (74) on the upper surface (70) of the inner embankment (60b) on the left and right sides of the road pavement (64b) to prevent vehicle overturning. The clearance space (74) is an area on the upper surface (70) of the inner embankment (60b) where the road pavement (64b) is not formed. The width of each clearance space (74) formed on the left and right sides of the upper surface (70) of the inner embankment (60b) is, for example, 5 to 15 m, specifically 7 to 12 m, and more specifically 8 to 10 m. For example, if the width of the clearance space (74) formed on the left and right sides of the upper surface (70) of the inner embankment (60b) is 8 m, the total width of the clearance space (74) is approximately 16.0 m. Here, if the width of the clearance space (74) is too small, there is a concern that a vehicle may overturn during uneven settlement of the inner embankment (60b), and if it is too large, not only is the landfill capacity for household waste reduced, but costs are also unnecessarily increased. The road paving section (64b) can be formed from recycled aggregate (recycled aggregate), waste concrete, asphalt concrete, etc., and preferably is formed from recycled aggregate, and the paving thickness is preferably about 50 cm, similar to the backfill layer (44b).

[0022] As illustrated in FIG. 3, a "V"-shaped soil drainage ditch (80) may be formed as a rainwater drainage facility in the open space (74) formed on the left and right sides of the road pavement (64b). A waterproof mat (82) may be installed in the soil drainage ditch (80) to prevent rainwater from seeping into the road body (62b) and the inner embankment (60b) and to allow rainwater to be drained outside the landfill through the soil drainage ditch (80).

[0023] FIG. 4 is a cross-sectional view (A) and a plan view (B) showing the state in which subsidence pins are installed to detect subsidence of an internal work road in a waste landfill according to an embodiment of the present invention. As shown in FIG. 4, in a waste landfill equipped with an internal work road constructed of household waste according to an embodiment of the present invention, subsidence pins (90) for detecting subsidence of the internal work road, specifically, the upper surface (70) of the road pavement (64b) and the internal embankment (60b), are installed in a direction perpendicular to the length direction of the road pavement (64b) and the road body (62b), at least two, preferably at least three, and more preferably at least five. For example, as shown in FIG. 4, rod-shaped subsidence pins (90) are installed at five locations, respectively, in the central part of the road pavement (64b), the left and right edges of the road pavement (64b), and the left and right edges of the upper surface (70) of the road body (62b). By measuring the height variation of the subsidence pins (90) installed in this manner, uneven subsidence of the upper surface (70) of the road pavement (64b) and the inner embankment (60b) can be easily detected. As shown in Fig. 4B, the subsidence pins (90) can be installed at regular intervals along the length of the road pavement (64b) and the inner embankment (60b).

[0024] Next, the construction sequence of a waste landfill equipped with an internal work road constructed from household waste according to the present invention will be explained. To construct a waste landfill according to the present invention, first, (1) a waste delivery vehicle dumps household waste at the construction site of the internal embankment (60b), (2) the household waste is transported and spread out to the landfill site using a 50-ton dry-type bulldozer, etc., and then (3) the household waste is crushed and compacted using a 26-ton dedicated compactor, etc. Next, (4) the surface leveling of the upper surface (70) and slope (72) of the internal embankment (60b) is performed using a 27-ton wet-type bulldozer, etc., and daily backfilling is performed as needed, and then (5) a road body (62b) and a road paving section (64b) are laid on the upper surface of the internal embankment (60b).

[0025] Referring again to FIG. 2 and 3, in the present invention, each stage of the waste landfill layer (42a, 42b) is formed by burying waste in a space formed by an outer embankment (50a, 50b) and an inner embankment (60a, 60b), and since the waste landfill layer (42a, 42b) has a multiple-stage landfill structure, for example, the lower waste landfill layer (42a) has a lower outer embankment (50a) and an inner embankment (60a) formed therein, and the upper waste landfill layer (42b) has an upper outer embankment (50b) and an inner embankment (60b) formed therein. Accordingly, as the number of waste landfill stages increases, the inner embankment (60a, 60b) of each stage is buried in the waste of the upper stage, so the inner embankment (60a, 60b), roadbed (62a, 62b), and road paving section (64a, 64b) are temporary roads used only during the waste landfill of each stage. Accordingly, the recycled aggregate used in the road paving section (64a) can be cut before the inner working road of the next stage is constructed and recycled for the construction of the road paving section (64b) of the inner working road of the next stage.

[0026] Referring to FIG. 2, the road pavement (64a, 64b) is connected to an access road (56) formed on an outer embankment (50a, 50b) for the entry and exit of work vehicles. A work vehicle for waste landfilling enters the waste landfill layer (42a, 42b) through the access road (56), moves to the inner landfill section of the waste landfill layer (42a, 42b) through the road pavement (64a, 64b), and then performs waste landfilling work in each layer. Once the waste landfilling work is completed, the work vehicle moves outside the waste landfill layer (42a, 42b) through the road pavement (64a, 64b) and the access road (56).

[0027] In the waste landfill according to the present invention, as a result of driving a waste vehicle on the internal work road and monitoring the condition of the road body (62b) and the road pavement (64b), the stability of vehicle traffic was confirmed, and as a result of measuring the road alignment, no movement to the left or right occurred, so it was confirmed that it is possible to construct an internal road with household waste.

[0028] According to the present invention, since the internal embankment (60a, 60b) and the internal work road are constructed with household waste, the landfill capacity of household waste can be increased and the construction cost of the internal work road can be reduced. In addition, according to the present invention, by constructing the internal work road (main road) with household waste, cracks that may occur due to differential settlement between soil and waste can be minimized, thereby suppressing the infiltration of rainwater into the landfill and the leakage of landfill gas, and forming a structurally stable waste landfill.

[0029] Although the present invention has been described above with reference to the attached drawings and exemplary embodiments, the present invention is not limited to the contents illustrated in the drawings and the embodiments described above. Drawing reference numerals have been indicated in the following claims to aid understanding, but the scope of the claims below is not limited to the drawing reference numerals and the contents illustrated in the drawings, and should be interpreted comprehensively to include all variations of the exemplary embodiments, equivalent configurations, and functions.

Claims

Claim 1 Two or more layers of waste landfill (42a, 42b) that decrease in size toward the top; outer embankments (50a, 50b) surrounding the edges of the waste landfill layers (42a, 42b); a backfill layer (44a, 44b) laid on top of the waste landfill layers (42a, 42b) to block the waste landfill layers (42a, 42b) from the outside; inner embankments (60a, 60b) constructed of household waste, which divide the internal landfill sections of each layer of waste landfill layers (42a, 42b) into a plurality of separated areas inside the outer embankments (50a, 50b); and an inner embankment (60a, 60b) laid on top of each inner embankment (60a, 60b) to prevent external exposure of the inner embankments (60a, 60b) and to induce scattering and odor reduction of household waste, and the inner embankment (60a, A road body (62a, 62b) forming the foundation structure of an internal working road formed in 60b); and includes a road paving section (64a, 64b) formed on the upper part of the road body (62a, 62b) and providing a movement path for a work vehicle, and the household waste is household waste and industrial waste contained in a volume-based waste bag, and the inner embankment (60b) includes an upper surface (70) formed horizontally in the center and slopes (72) formed inclinedly on both sides of the upper surface (70), and the road paving section (64b) is formed on the upper surface (70) of the inner embankment (60b), and a clearance space (74) with a width of 8 m or more is formed on the upper surface (70) of the inner embankment (60b) on the left and right sides of the road paving section (64b), and a subsidence pin (90) for detecting subsidence of the upper surface (70) of the road paving section (64b) and the inner embankment (60b) of the road paving section (64b) and the road body (62b) A waste landfill in which five or more rod-shaped sinking pins (90) are installed in a direction perpendicular to the length direction, and are installed at five locations respectively at the center of the road pavement (64b), the left and right edges of the road pavement (64b), and the left and right edges of the upper surface (70) of the road body (62b). Claim 2 delete Claim 3 delete Claim 4 A waste landfill according to claim 1, wherein a “V” shaped soil drainage channel (80) is formed as a rainwater drainage facility in the open space (74) formed on the left and right sides of the road pavement (64b). Claim 5 delete Claim 6 A waste landfill according to claim 1, wherein the road body (62a, 62b) is formed with ordinary soil to a thickness of 0.5 to 2 m, and the road pavement (64a, 64b) is formed with aggregate to a thickness of 0.5 to 1 m.

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