JP2020105743A - Partition method for landfill - Google Patents

Abstract

To efficiently conduct a landfill operation while preventing accumulated ash from scattering.SOLUTION: A partition method for landfill 100 in which used coal accumulated ash 102 is accumulated and water 102b is spread over the accumulated ash 102 comprises installing a hollow and flexible hollow hose 150 having a predetermined length along a boundary portion of an area A that partitions the landfill 100, filling the inside of the hose 150 with water to expand it and draining the water 102b in the area A to the outside of the area A, thereby creating land for each area A and preventing the scattered accumulated ash 102 from scattering.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for partitioning a landfill made of accumulated ash such as coal ash.

The vast landfill where the revetment is reclaimed has a vast area of 100,000 square meters, for example. Coal ash, which is an industrial waste collected at the time of power generation at a coal power plant, is used as a deposit at this landfill. The deposited ash on which the coal ash is deposited scatters when it is dried. Therefore, by keeping the wet state of the deposited ash by sprinkling water or retaining water, the scattering of dust is prevented.

The depth of the retained water is about 5 cm to 20 cm, because the ground surface of the coal ash has irregularities (unevenness). In order to use such landfill land, it is necessary to dry up the accumulated water in the coal ash portion and cover the surface with earth and sand.

As a conventional technique related to land reclamation, for example, a technique of excavating and stacking a dry coal ash layer and installing a temporary embankment to create land for land reclamation for each section in which the temporary embankment is installed is disclosed (for example, , Patent Document 1 below). Further, a technique is disclosed in which a flexible membrane weir that stands up and falls down by supplying and draining water is used as a tide weir (for example, see Patent Document 2 below).

JP, 2017-154127, A Japanese Patent Laid-Open No. 61-257520

However, in the conventional technique, landfilling could not be efficiently performed while preventing the scattered ash from scattering. For example, in the technique described in Patent Document 1, it is necessary to install the temporary embankment with a heavy machine or the like, and it takes time and cost to install the temporary embankment. In addition, the land is created without drying the coal ash, and the soil and the coal ash cannot mix to separate the two. The earth and sand mixed with coal ash becomes industrial waste that cannot be reused.

Further, in the technique described in Patent Document 2, since the flexible membrane weir is fixed to the concrete skeleton with anchor bolts, the flexible membrane weir can be easily moved as the landfill section moves. In addition, the flexible membrane weir cannot be easily installed and moved to any place.

The present invention has been made in view of the above problems, and an object of the present invention is to efficiently reclaim land while preventing scattering of accumulated ash.

In order to achieve the above object, the partition method for a landfill of the present invention is a partition method for a landfill in a state in which accumulated ash of used coal is accumulated, and water is spread over the accumulated ash, A hollow and flexible hollow elastic body of a predetermined length is installed along the boundary part of the area that partitions the landfill, and the inside of the hollow elastic body is filled with a medium to expand the hollow elastic body. It is characterized by including the process of draining said water retention outside the said area.

Further, it is characterized in that after the draining step, the area is covered with earth and sand and buried.

Further, after the step of draining, the medium inside the hollow elastic body is discharged to shrink the hollow elastic body, the hollow elastic body is moved, and then installed along the boundary portion of the partitioning area, It is characterized in that the process is repeated by filling the inside of the hollow elastic body with a medium to expand the medium and draining the water in the area to the outside of the area.

Further, the hollow elastic body is a hose.

The medium is water, the water retention, or gas.

Further, after the step of draining, laying a resin edge cutting sheet having flexibility in the area, covering the edge cutting sheet with earth and sand to create a land for temporary use, To do.

According to the above configuration, a hollow elastic body such as a hose is installed along the boundary part of the area that divides the landfill, and the hollow elastic body is filled with a medium to be expanded to prevent water retention in the area. By implementing the process of draining water to the outside, it becomes possible to efficiently create land for each area while partitioning the landfill by each area. Further, since the stagnant water is drained for each partitioned area, the area after draining is only a part of the entire landfill area, so that it becomes possible to suppress the scattering of the accumulated ash as dust.

According to the present invention, there is an effect that landfill can be efficiently performed while preventing scattering of accumulated ash.

FIG. 1 is a diagram illustrating a method of partitioning accumulated ash in a landfill according to an embodiment. FIG. 2A is a diagram illustrating a procedure of dividing the landfill according to the embodiment into areas and temporarily using the landfill. (Part 1) FIG. 2B is a diagram illustrating a procedure of partitioning each landfill area and temporarily using the landfill according to the embodiment. (Part 2) FIG. 3 is a diagram illustrating ground improvement in an area where water has stagnated according to the embodiment. FIG. 4 is a diagram for explaining dust prevention in the water retention area according to the embodiment. FIG. 5 is a flowchart showing a procedure of landfill of a landfill according to the embodiment. FIG. 6 is a flowchart showing a procedure for preventing dust in a landfill according to the embodiment.

(Embodiment)
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the embodiment, a part or all of the area used as an ash disposal site for used coal ash in a coal power plant is used for other purposes, for example, landfill for temporarily using it as land such as a material storage site. To do.

"1. Method of partitioning sediment ash in a landfill"
FIG. 1 is a diagram illustrating a method of partitioning accumulated ash in a landfill according to an embodiment. FIG. 1A is a cross-sectional view showing a landfill, for example, a coastal landfill 100, which has a predetermined area (area) by a revetment levee 110 and an inland embankment 111. have.

The landfill 100 is used as an ash disposal site into which a slurry ash 102a obtained by dissolving coal ash with water is introduced via a pipe 101. The slurry ash 102a is deposited as deposited ash (soft ground) 102 over the entire area of the landfill 100. In addition, the water content of the slurry ash 102a becomes the water retention 102b having a predetermined depth (for example, 10 cm in the range of 5 to 20 cm) above the accumulated ash 102. The staying water 102b prevents the dust of the accumulated ash 102 from scattering. It should be noted that water may be maintained at a predetermined depth by separately pouring water into the landfill 100 and discharging the water 102b.

FIG. 1B is a top view showing the landfill, and corresponds to the cross-sectional view of FIG. The landfill 100 is an area surrounded by a bank 110 and a bank 111. The pipe 101 has, for example, a structure that floats on the water 102b due to a float, the input portion is movable in the direction of the landfill 100, and the coal (pulverized coal) used at the coal power plant is slurried. Supply things to landfill 100.

Here, the landfill is advanced in the direction X indicated by the arrow. The direction X is, for example, a direction from a shallow place of the water retention 102b to a deep place. In the landfill, the landfill site 100 is divided into a plurality of areas A to F, and the areas A to F are landfilled with earth and sand so that the landfilled area can be temporarily used. The temporary use is, for example, use as a temporary material storage when a factory or the like is constructed adjacent to the landfill 100. The landfill that was temporarily used can be reused as an ash disposal site by removing the soil that was used for temporary use.

FIG. 2A and FIG. 2B are views for explaining a procedure of partitioning the landfill according to the embodiment by area and temporarily using it. In the embodiment, the plurality of areas A to F are partitioned by the hollow elastic body having a predetermined length.

FIG. 2A(a) shows a state in which a hose 150 is installed as a hollow elastic body that partitions the area A shown in FIG. 1(b). For example, in order to partition the area A, both ends of the hose 150 are provided in contact with the bank 110 shown in FIG. The hose 150 is made of an elastic material such as rubber having a hollow interior and flexibility. The volume (cross-sectional area) of the hose 150 is increased (expanded) by filling the inside with water or the like, and the volume is decreased (contracted) by draining the internal water. The medium with which the hose 150 is filled may be water using a pump, water retention 102b, or gas such as air.

When partitioning the area A, the hose 150 is not filled with water, and the hose 150 in a contracted state is installed in the area A portion as shown in FIG. 2A(a). The hose 150 is to be assembled manually, for example, by assembling a scaffold along the boundary part of the area A (a part in contact with the areas B and C) shown in FIG. You can Here, the hose 150 at the time of installation can be easily installed by hand because it is lightweight because it is not filled with water inside. For example, as in the conventional case, the accumulated ash 102 can be obtained by using a heavy machine or the like. It is much easier and less expensive than the work of hoisting and embankment.

In addition, the hose 150 is not limited to one hose 150 depending on the length of the boundary portion of the area A, and a plurality of hoses 150 having different lengths may be connected and installed. This allows the hose 150 of any length to be easily installed.

Next, as shown in FIG. 2A(b), the hose 150 installed for the area A is filled with water, for example, to expand the hose 150. As the hose 150, one that expands with a diameter exceeding the depth (for example, 10 cm) of the stagnant water 102b at the installation position is used. As a result, the hose 150 can partition the area A from the adjacent areas B and C.

The water to be filled in the hose 150 is filled toward the other end of the hose 150 using, for example, a pump provided at one end of the hose 150. In addition, a valve that can be freely opened and closed is provided at a plurality of positions in the length direction of the hose 150 so that water and water 102b can be filled from a plurality of valve portions by a pump, and water 102b can be naturally discharged from the opened valve portion. It may be injected.

Then, the submersible pump 205 is installed in the area A to drain the stagnant water 102b accumulated in the area A to the outside of the area A (for example, areas B and C). As a result, in the area A, the water 102b disappears and the accumulated ash 102 is exposed. The deposited ash 102 starts to dry from the surface. In order to use the area A as land, it is first necessary to dry the accumulated ash 102.

Here, as shown in FIG. 2A(c), the hose 150 receives a lateral pressure due to the retained water 102b from the outside of the area A (areas B and C). When the position of the hose 150 moves due to the buoyancy of the hose 150 or the like when the lateral pressure or the medium to be filled is gas such as air, the hose 150 is deposited using a fixture 207 such as a pile, a band, or a pin. It may be fixed to the ash 102 part. FIG. 2A(c) shows an example in which a fixture 207 for a pile is installed on the side opposite to the side pressure side that the hose 150 receives.

Next, as shown in FIG. 2B(d), in the area A, the edge cutting sheet 210 is laid on the entire area of the deposited ash 102. The edge cutting sheet 210 is made of a flexible material such as resin. Further, the surface is a mesh having a predetermined fineness, and for example, a general-purpose civil engineering sheet can be used. The edging sheet 210 is located between the ash 102 and the earth and sand (cover soil) 220 that is put on the ash 102, thereby preventing the ash 102 from mixing with the earth and sand 220. That is, the edging sheet 210 has a predetermined mesh (unit of fineness) to the extent that the accumulated ash 102 is not mixed with the earth and sand 220.

The size (area) of each of the areas A to F including the area A corresponds to the area in which the edging sheet 210 is laid. For example, the area where the edging sheet 210 can be laid within the period until the deposited ash 102 exposed after being partitioned as the area A is dried and the deposited ash 102 is scattered is set as the area A. As a result, the accumulated ash 102 can be exposed in the wide landfill 100 in units of the areas A to F, and the scattered ash 102 can be prevented from scattering.

Next, as shown in FIG. 2B(e), earth and sand 220 is deposited at a predetermined height (depth) on the edge cutting sheet 210 laid in the area A. For example, the heavy sand 230 such as a bulldozer is used to spread the soil 220.

In this way, by laying the edge cutting sheet 210, the earth and sand 220 do not directly touch the accumulated ash 102. At this time, the edging sheet 210 is positioned so as to be sandwiched between the accumulated ash 102 and the earth and sand 220, and even when the soft accumulated ash 102 is deformed or the pressure from the earth and sand 220 side is generated, it is possible to cope with them. The soft deformation prevents the earth and sand 220 from touching the accumulated ash 102.

Thereby, as shown in FIG. 2B(e), it is possible to create land for temporarily using the area A. Further, the land can be constructed in the same manner as the area A by repeating the above procedure for the other areas B to F. At this time, the hose 150 used for partitioning the area A may be drained and then moved to the area B portion where the land is to be created next. FIG. 2B(e) shows a state in which the hose 150 is installed in the area B where the land is to be created next and the water 102b in the area B is drawn.

Then, by sequentially creating the areas A to F, the entire landfill 100 can be finally created for temporary use. Areas A to F in the reclaimed land 100 for land creation are within a range (area) necessary for a material storage area which is temporarily used when a factory or a power plant is constructed adjacent to the reclaimed land 100. ). For example, according to the embodiment, by setting one or a plurality of areas A to F corresponding to a necessary range as a material storage area and sequentially performing the above procedure for the plurality of areas A to F, By using the hose 150, it is possible to easily divide the area into areas for temporary use.

In addition, the edging sheet 210 is laid on the accumulated ash 102 in each of the areas A to F, so that the earth and sand 220 do not touch the accumulated ash 102. Since the sediment ash 102 is not mixed with the earth and sand 220, the earth and sand 220 does not become an industrial waste and the earth and sand 220 can be reused. When the earth and sand 220 are taken out by the heavy machine 230, the earth and sand 220 up to the depth where the edge cutting sheet 210 is located may be taken out.

At this time, since the edge cutting sheet 210 has flexibility, only the earth and sand 220 can be easily taken out without tearing and the accumulated ash 102 is not mixed. In this respect, conventionally, since the sediment ash 102 is mixed with the earth and sand 220, the earth and sand 220 cannot be taken out and the capacity of the ash disposal site is reduced, but according to the embodiment, the capacity of the ash disposal site is impaired. Not have the advantage.

The edge cutting sheet 210 is exposed again by removing the soil 220. Furthermore, by removing the edging sheet 210, it is possible to easily return the accumulated ash 102 to the exposed state. For example, after the area A is temporarily used as a material storage area, the soil 220 and the trimming sheet 210 are removed, so that the area A is filled with water 102b to fill the accumulated ash 102 shown in FIG. It can also be returned to. As a result, the area A can be reused as an ash disposal site to receive the accumulated ash 102. Then, the areas A to F can be returned to the initial state in area units.

In the above description, the landfill 100 is divided into areas A to F and temporarily used in a state where the edge cutting sheet 210 is laid. However, the landfill 100 may be finally landfilled. In the final landfill, after removing the earth and sand 220 and the edge cutting sheet 210, the earth and sand 220 of a predetermined height is accumulated on the accumulated ash 102. The landfill 100 after the final landfill can be used for a limited purpose, for example, as a low-rise building such as a prefabricated building with a small weight, a parking lot, or the like.

As described above, when the earth and sand 220 are piled up on the accumulated ash 102 and temporarily used, the edging sheet 210 that cuts the earth and sand 220 and the accumulated ash 102 is laid to receive the earth and sand 220. In the embodiment, the area is partitioned by the hose 150, water is drained step by step in each area, and the edge cutting sheet 210 is laid on the dried portion. As a result, land can be created while preventing the generation of dust of the coal ash, which is the accumulated ash 102, in units of small areas that partition the entire landfill 100.

In addition, in the embodiment, the hose 150 is installed at the boundary of the area in order to extract the water retention 102b step by step in each area. Since the hose 150 is lightweight and can be moved by hand, it can be easily installed as compared to the conventional construction of a bank with a heavy machine. Furthermore, since the hose 150 can be moved and used when partitioning a new area after the land is constructed, it is possible to efficiently perform the land construction work with respect to the conventional work of demolishing and removing the embankment. Become.

By the way, in the example shown in FIG. 1B, the boundaries of the areas A to F are set to have an arc shape, but the invention is not limited to this. For example, a boundary of a shape corresponding to the shape of the entire area of the landfill 100 may be set, and each area A to F is set in a square cell shape to partition the entire landfill 100 into a grid-shaped area. May be Furthermore, the arc shape and the grid shape may be combined. When partitioning the areas A to F with the hose 150, the hose 150 at the corner of each area is bent with a predetermined radius R. In addition, the hose 150 may be installed linearly in the linear part of each area, and joints may be separately installed in the corners, and the ends of the hose 150 may be connected to both ends of the joint.

"2. Ground improvement method in flooded area"
Next, a ground improvement method in an area where water has stagnated will be described. Generally, cement solidification material is mixed in the area where water has stagnated to improve the ground. However, there was a case in which the solidified material flowed out of the area when the solidified material was agitated in the water and the predetermined amount of the solidified material did not stay in the target area. At this time, when the water level of the stagnant water was deep, it was difficult to confirm the penetration depth of the stirrer and it was difficult to manage. In the embodiment, for example, in the above description, a method for easily improving the ground in the area A that has been flooded by the flooded water 102b is provided.

FIG. 3 is a diagram for explaining ground improvement in an area where water has stagnated according to the embodiment. The target area of water retention is, for example, the area in which the water retention 102b extends over the accumulated ash 102 shown in FIG. 1(a), or another area after partitioning the area A shown in FIG. 2A(b). In the area (area B) or the like, the water 102b is spread over the accumulated ash 102.

A partition frame 300 having a predetermined size is installed in the area where the water is retained. As the partition frame 300, for example, four steel plates 300a to 300d assembled in a frame shape can be used. At the time of this assembly, for example, the corners of each of the plates 300a to 300d are fixed with bolts or hinges, or other fixing frame members are fitted and assembled. This partition frame 300 is installed at a desired location in the area where water has stagnated. At the time of installation, the lower end of the partition frame 300 is made to bite into the deposited ash 102 to a predetermined depth.

Then, a solidifying material (not shown) for ground improvement is put into the inside of the partition frame 300 manually or by using the heavy machine 230 or the like. The partition frame 300 has a partition of a predetermined size (area), and the solidifying material may be charged in a predetermined amount corresponding to the partitioned area. Then, the heavy machine 230 equipped with the stirrer 330a stirs the water 102b in the partition frame 300.

At this time, the solidified material charged in the partition frame 300 does not flow out to the outside by the partition frame 300 even after stirring after the charging. In addition, by mixing a predetermined amount corresponding to a predetermined size range of the partition frame 300, it is possible to obtain a desired mixing amount, and the solidifying material is transferred from the range of ground improvement specified by the partition frame 300 to the outside. It can be prevented from leaking. Moreover, an appropriate amount of the solidifying material corresponding to the range of ground improvement specified by the partition frame 300 can be charged, and the amount of the solidifying material to be input can be easily controlled.

After this, the stored water (corresponding to the retained water 102b) in the partition frame 300 is drained by a pump or the like and dried up. As a result, it is possible to improve the ground within the target range partitioned by the partition frame 300 with the solidifying material. Further, this dry-up makes it easier for the worker to confirm the penetration depth of the stirrer 330a.

Next, with the partition frame 300 still installed, a predetermined amount of dust prevention agent (equivalent to FIG. 4 described later) is sprayed in the area of the partition frame 300. The dust preventive agent prevents the accumulated ash 102 after ground improvement that is exposed after the stored water is drained from being dried and scattered. Also for this dust-preventing agent, a required spraying amount can be obtained corresponding to the size of the partition frame 300, and the amount of the dust-preventing agent to be added can be easily controlled.

By the way, the partition frame 300 installed in the area where the ground has been improved is disassembled and moved, and the same operation as above is repeated, whereby the ground can be improved in a plurality of areas in units of the size defined by the partition frame 300. it can. At the time of this movement, for example, when the ground improvement of the adjacent area is performed, the other three boards 300a, 300c, 300d are moved without moving the one board 300b located in the adjacent area. Then, the partition frame 300 may be reassembled, and the labor for moving the partition frame 300 can be facilitated.

As described above, according to the embodiment, it becomes possible to drain the stored water in the area partitioned by the partition frame 300 with the ground improvement. That is, in the past, the embankment was carried out at a position corresponding to the installation position of the partition frame 300 with a heavy machine to partition the area, so that it took time to install the embankment, but according to the embodiment, it is possible to assemble and disassemble. By using the partition frame 300, the area for ground improvement can be partitioned more easily. Further, it becomes possible to add an appropriate amount of the solidifying material corresponding to the area partitioned by the partition frame 300.

Further, the partition frame 300 installed for ground improvement is left in the installed state until the solidifying material is charged and the stored water is completely drained. As a result, it is possible to eliminate the work conventionally required to build a bank for ground improvement. Further, it becomes possible to spray an appropriate amount of dust prevention agent corresponding to the area partitioned by the partition frame 300.

Further, in the ground improvement using the partition frame 300 described above, by installing the partition frame 300 at an arbitrary position in the landfill 100, the ground at this installation position can be improved. In this case, for example, as described above, the landfill 100 may be partitioned into the area A by the hose 150, and the partition frame 300 may be installed in the partitioned area A. Further, even when the partition frame 300 is installed in the area partitioned by the conventional embankment, the ground can be similarly improved.

Further, in the above description, the partition frame 300 has a planar rectangular shape, but may have various shapes according to the shape of the area requiring ground improvement, for example, a circular shape, an elliptical shape, or a polygonal shape. When the partition frame 300 has a shape with corners, when the ground improvement is sequentially performed in a plurality of areas, it is possible to omit the overlapping portion in the adjacent areas, and thus it is possible to efficiently perform the ground improvement work.

“3. Prevention method of dust generation before laying edge cutting sheet for each area”
For example, after the drainage of water in a landfill, the exposed ash is dried and dust is generated from the ground surface. Therefore, conventionally, the generation of dust is suppressed by sprinkler sprinkling or the like. However, when reclaiming a large area, the sprinkling range was also large, making construction difficult.

On the other hand, in the embodiment, a method of using the edge cutting sheet 210 described above and preventing the generation of dust before the edge cutting sheet 210 is laid will be described. For example, according to the partitioning method of the above-described embodiment (see FIG. 2A, FIG. 2B, etc.), by using the hose 150 to partition the area, the large-scale landfill 100 can be divided into areas and temporarily used. Land can be secured.

FIG. 4 is a diagram for explaining dust prevention in the water retention area according to the embodiment. In the embodiment, after the stagnant water 102b in the partitioned area A is drained as shown in FIG. 2A(b), as shown in FIG. Sprinkle on. The dust prevention agent 401 covers the accumulated ash 102 and prevents the accumulated ash 102 from scattering. At this time, in order to secure the position of the worker, for example, a work passage 410 (for example, a thickness of 1 m and a width of 5 m) 410 in which cement is solidified may be provided.

After that, as shown in FIG. 4B, the above-mentioned edging sheet 210 is laid on the scattered dust preventing agent 401. Note that the edging sheet 210 is not limited to immediately after draining the area A, and when a predetermined period (for example, 2 to 3 weeks) occurs before receiving the earth and sand 220, until the earth and sand 220 is received. The edge cutting sheet 210 may not be laid. For example, the edge cutting sheet 210 does not have to be laid during a period of rainfall due to a long-term weather forecast or the like, and water may be separately sprinkled on a sunny day. In addition, as a precaution, the submersible pump 205 may be left installed so that the water 102b in the area A can be drained.

In this way, the landfill 100 is partitioned into a plurality of areas A to F, the water 102b is discharged in units of one area A, and the dust preventive agent 401 is sprayed to form a large landfill 100. Also, it becomes possible to suppress the generation of dust. According to the embodiment, it is possible to prevent the generation of dust in each divided area, and it is possible to eliminate the conventional work such as sprinkling water over the entire large-scale landfill 100 for dust prevention. Further, by laying the edge cutting sheet 210 after the dust prevention agent 401 is sprayed, the generation of dust can be similarly prevented. Further, according to the embodiment, the edge cutting sheet 210 can be efficiently laid on the entire large-scale landfill 100.

Further, in the above description of the application of the dust prevention agent 401 to the area A, the area A is partitioned by the hose 150, but even if the area A is partitioned by other than the hose 150, the same effect of preventing the generation of dust can be obtained. be able to. For example, even when the area A is partitioned by a conventional embankment, by spraying the dust prevention agent 401 on the area A, it is possible to similarly obtain the effect of preventing the generation of dust.

FIG. 5 is a flowchart showing a procedure of landfill of a landfill according to the embodiment. Mainly, the procedure related to "1. Method for partitioning sediment ash in landfill" described above is shown. First, of the entire area of the landfill 100 used as an ash disposal site, an area to be temporarily used (for example, area A) is determined, and the hose 150 is installed along the boundary part of the area A. (Step S501).

Next, after filling the inside of the hose 150 with water or the like to expand the hose 150, the stagnant water 102b in the area A is drained to the outside of the area A (step S502). As a result, in the area A, the deposited ash 102 starts to appear and begins to dry.

Here, when carrying out the above-mentioned "3. Method for preventing dust generation before laying edge-cutting sheet for each area", the step S503 is carried out. In step S503, dust prevention agent 401 is sprayed in area A (step S503). As a result, in the area A, it is possible to prevent the dried accumulated ash 102 from scattering in the period until the edging sheet 210 is laid.

After the execution of step S502 or step S503, the edge cutting sheet 210 is laid on the accumulated ash 102 in this area A (step S504). Then, the edge cutting sheet 210 is covered with earth and sand 220 (step S505). In this state, in the area A that partitions the landfill 100, the edging sheet 210 is interposed between the accumulated ash 102, and the earth and sand 220 are accumulated on the edging sheet 210, and the area A is used for a predetermined purpose. It can be temporarily used as land.

By carrying out step S505, one area A can be temporarily used. After that, when the area to be temporarily used is continuously expanded, the processes after step S501 may be repeated.

FIG. 6 is a flowchart showing a procedure for preventing dust in a landfill according to the embodiment. The procedure for "2. Ground improvement method in flooded area" described above is shown. The procedure shown in FIG. 6 can be carried out at any place on the landfill 100, but here, an application example will be described in which the landfill 100 shown in FIG. 5 is further divided into a plurality of areas.

In this case, after partitioning the landfill 100 into the area A by the hose 150 shown in step S501 of FIG. 5, the partition frame 300 is installed at a desired position in this area A (step S601). After that, a predetermined amount of the solidifying material is put into the inside of the partition frame 300 (step S602). An appropriate amount corresponding to the area of the partition frame 300 can be input.

After that, the inside of the partition frame 300 is stirred by the stirrer 330a or the like (step S603), and then the water 102b in the partition frame 300 is drained to the outside of the partition frame 300 by a pump or the like (step S604). As a result, it is possible to improve the ground in the range where the partition frame 300 is installed.

After that, a predetermined amount of the dust prevention agent 401 is sprayed inside the partition frame 300 (step S605). As a result, it is possible to prevent the generation of dust due to the scattering of the deposited ash 102 in the range where the partition frame 300 is grounded. After that, the process of step S502 shown in FIG. 5 may be performed.

In addition, in step S605, when the dust prevention agent is sprayed in units of the partition frame 300, the dust prevention agent can be omitted from the area A in step S503.

According to the embodiment described above, a hose as a hollow elastic body is installed along the boundary portion of the area that divides the landfill, and the hose is filled with water or the like to expand the water, and the water is trapped in the area. The process of draining water to the outside of the area is implemented. As a result, the land in the partitioned area can be efficiently created. In addition, since the stagnant water is drained for each partitioned area, the area after drainage is only a part of the total landfill area, so it is possible to suppress the scattering of accumulated ash as dust as much as possible. .. After the process of draining, by covering the area with earth and sand, it is possible to prevent the scattering of dust, but according to the embodiment, it is only necessary to spray water to at least the partitioned area, which is a large scale. Work such as watering the entire landfill can be eliminated. A general-purpose low-cost hose can be used as the hollow elastic body. Moreover, since the hose is hollow and lightweight, it can be easily installed and moved. In this respect, it can be handled much more easily than a conventional embankment using heavy equipment, and landfill work can be performed efficiently.

Further, after the step of draining, the area that is covered with earth and sand and partitioned off can be used as a final landfill for a predetermined purpose. By covering the sediment ash with soil, it is possible to suppress the generation of dust due to scattering of the ash.

After the process of draining, the water inside the hose is drained, the hose is contracted, the hose is moved, and the hose is installed along the boundary of the area to be partitioned next. The process of expanding and draining stagnant water in the area to the outside of the area may be repeated. As a result, it becomes possible to efficiently construct land that can be used sequentially for each area that divides a vast landfill. In addition, since the stagnant water is drained in each partitioned area, the area after draining is only a part of the entire landfill, so the accumulated ash is more dusty than when the stagnant water in the entire landfill is drained. It becomes possible to suppress the scattering as much as possible.

Further, water, water retention, or gas such as air can be arbitrarily used as a medium for filling the hose. If there is water in the area, water in the area can be used.

Further, after the draining step, a step of laying a flexible resin edge cutting sheet in the partitioned area and covering the edge cutting sheet with earth and sand to create a land for temporary use may be carried out. As a result, an edge sheet is placed in the ground of the partitioned area, and land for temporary use such as a material storage site can be created. The edging sheet is installed between the accumulated ash and the cover soil, and the soil of the cover soil does not mix with the accumulated ash and can be reused without becoming industrial waste.

INDUSTRIAL APPLICABILITY As described above, the present invention can be applied to a technology for landfilling an ash disposal site, and is particularly useful for a technology for utilizing a part of a vast landfill.

100 landfill (ash disposal site)
102 accumulated ash 102a slurry ash 102b water retention 150 hose 205 submersible pump 207 fixture 210 edge cutting sheet 220 earth and sand (covering soil)
230 Heavy equipment 300 Partition frame 330a Stirrer 401 Dust prevention agent A to F area

Claims (6)

A method of partitioning a landfill in a state in which accumulated ash of used coal is accumulated, and water is spread over the accumulated ash,
A hollow and flexible hollow elastic body of a predetermined length is installed along the boundary of the area separating the landfill,
The inside of the hollow elastic body is filled with a medium to be expanded,
Draining the water retention in the area to the outside of the area,
A method for partitioning a landfill, which includes a process. The method of partitioning a landfill according to claim 1, wherein after the step of draining, the area is covered with earth and sand for landfilling. After the step of draining, the medium inside the hollow elastic body is discharged to shrink the hollow elastic body,
Move the hollow elastic body and install it along the boundary of the next partition area,
The inside of the hollow elastic body is filled with a medium to be expanded,
Draining the water retention in the area to the outside of the area,
The method of partitioning a landfill according to claim 1 or 2, wherein the steps are repeated. The landfill partitioning method according to claim 1, wherein the hollow elastic body is a hose. The said medium is water, the said water retention, or gas, The partition method of the landfill according to any one of claims 1 to 4. After the step of draining, laying a flexible resin edging sheet in the area,
Make a land for temporary use by covering the edge sheet with earth and sand,
The method of partitioning a landfill according to claim 1, further comprising a step.

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