JP2020105747A - Dust prevention method in landfills - Google Patents

Abstract

To efficiently prevent dust generation due to disposed ash when using the ground at the ash disposal site.SOLUTION: Provided is the dust prevention method of a filled-up land 100 in a state that used coal accumulated ash 102 is accumulated and retained water 102b covers the accumulated ash 102, includes the steps of: partitioning an area A in a filled-up land 100 to be temporarily used with a partition member 150; draining the retained water 102b out of an area A; dispersing a dust control agent in the area A; laying a resin trimming sheet 210 having flexibility in the area A; and covering the trimming sheet 210 with earth and sand 220. With this, dust generation in the Area A is prevented.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dust prevention method for preventing the generation of dust in a landfill.

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, with the conventional technology, it has not been possible to efficiently prevent the generation of dust due to the accumulated ash in which the coal ash of the ash disposal site has accumulated. When constructing land for temporary use of a part of the ash disposal site of coal ash, it is necessary to spray dust control agents to prevent dust generation due to drying of ash. For example, in the technology described in Patent Document 1, it is necessary to install a temporary embankment with a heavy machine or the like in order to partition an area where water has stagnated, 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 frame with anchor bolts, the flexible membrane weir can be easily moved as the landfill section moves. Therefore, the flexible membrane weir that divides the area cannot be easily installed and moved to any place. Since the temporary embankment and the flexible membrane weir cannot be easily installed and it takes time and labor, it is not possible to effectively prevent the generation of dust.

The present invention has been made in view of the above problems, and an object of the present invention is to efficiently prevent dust generation due to accumulated ash when using land in an ash disposal site.

In order to achieve the above object, the method for preventing dust in a landfill according to the present invention is a method for preventing dust in a landfill in a state where used coal ash is accumulated and water is spread over the accumulated ash. A partition of the land for temporary use in the landfill, draining the water retention in the area to the outside of the area, spraying a dust prevention agent on the area, and a resin having flexibility in the area. It is characterized by including the process of laying a rimming sheet made of, and covering earth and sand on the rimming sheet.

In the step of partitioning the area, a hollow and flexible hollow elastic body of a predetermined length is installed along a boundary portion of the area, and the inside of the hollow elastic body is filled with a medium. The body is inflated to partition the area.

In addition, each time the area is changed, in the step of partitioning the area of the land, the medium inside the hollow elastic body is discharged to contract the hollow elastic body, and the hollow elastic body is moved and then temporarily moved. The method is characterized in that the step of repeating the step of filling the inside of the hollow elastic body with a medium and expanding the medium after the step is installed along the boundary of the area of the land to be used.

In addition, when there is a target range for ground improvement in the area, in the partitioned area, a partition frame surrounding the target range is further installed, and a solidifying material is added to the water retention in the partition frame, Stir the water retention in the partition frame, drain the water retention, in the state where the partition frame is installed, put the dust prevention agent in the partition frame, after that, lay the edge cutting sheet And covering the edging sheet with earth and sand.

According to the above configuration, when using the ash disposal site for land use, this area is partitioned, water in the area is drained, and a dust preventive agent is sprayed into the area until the edge sheet is installed. In the meantime, it is possible to prevent the generation of dust even if the deposited ash in which the coal ash in the area is deposited dries. The dust prevention agent can be applied, for example, after the step of improving the ground at the time of land preparation.In this case, using this partition frame while leaving the partition frame installed in the target area for ground improvement, dust prevention can be performed. The agent can be sprayed, and the dust generation in the target range can be efficiently prevented.

Advantageous Effects of Invention According to the present invention, it is possible to effectively prevent dust generation due to accumulated ash when using land in the ash disposal site.

FIG. 1 is a diagram for explaining an outline of a dust prevention method for a landfill according to the embodiment. FIG. 2 is a diagram for explaining a method of partitioning accumulated ash in a landfill according to the embodiment. FIG. 3A is a diagram illustrating a procedure of dividing a landfill according to the embodiment into areas and temporarily using the landfill. (Part 1) FIG. 3B is a diagram illustrating a procedure of partitioning each landfill area according to the embodiment and temporarily using it. (Part 2) FIG. 4 is a diagram illustrating ground improvement in an area where water has stagnated according to the embodiment. FIG. 5 is a diagram illustrating dust prevention in a water retention area according to the embodiment. FIG. 6 is a flowchart showing a procedure of landfill of a landfill according to the embodiment. FIG. 7 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.

FIG. 1 is a diagram for explaining an outline of a dust prevention method for a landfill according to the embodiment. The landfill 100 is used as an ash disposal site 100 on which coal ash accumulated ash 102 is accumulated. As shown in FIG. 1( a ), the landfill 100 is in a state in which water 102 b is spread over the accumulated ash 102. The accumulated ash 102 generates dust when the accumulated ash 102 is exposed due to drainage of the stagnant water 102b or the like.

Then, when there is an area A in the landfill 100 that is desired to be used temporarily, as shown in FIG. 1B, the boundary portion of this area A is partitioned by a partition member (hose) 150. The partition member 150 is used to partition the accumulated water 102b on the accumulated ash 102 and drain the accumulated water 102b on the area A to expose the accumulated ash 102 on the area A. As the partition member 150, various members can be used as long as they can partition the area A. For example, it is possible to partition the area A by using a hollow elastic body, which will be described later, to expand by filling a medium inside. The exposed accumulated ash 102 generates dust, but in the embodiment, the edging sheet 210 is laid on the accumulated ash 102 in the area A to prevent the accumulated ash 102 from generating dust.

Here, in the embodiment, before the laying of the edging sheet 210, that is, in a state where the accumulated ash 102 is exposed, as shown in FIG. 1C, the dust prevention agent 401 is applied to the area A in the partition frame 300. Disperse. The partition member 150 has an area A having a predetermined size (area), and the dust prevention agent 401 may be sprayed in a predetermined amount corresponding to the partitioned area (area A).

At this time, the dust prevention agent 401 put in the area A partitioned by the partition member 150 does not flow out to the outside by the partition member 150 at the time of spraying. Further, an appropriate amount of the dust prevention agent 401 corresponding to the predetermined area A can be applied, and the amount of the dust prevention agent 401 applied can be easily managed. Then, by spraying the dust prevention agent 401, it is possible to prevent the exposed ash 102 from being dried and scattered as dust in the area A until the edging sheet 210 is laid in the area A.

After that, as shown in FIG. 1D, the edge cutting sheet 210 is laid in the area A partitioned by the partition member 150. 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.

Then, by covering the edge cutting sheet 210 with earth and sand 220, the area A can be constructed as land for temporary use. By laying the edge cutting sheet 210, the earth and sand 220 does 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.

Further, by laying the edge cutting sheet 210 on the accumulated ash 102 in the area A, the earth and sand 220 does 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 the above description, the area A of the large landfill 100 where it is desired to prevent the generation of dust has been described. However, for other areas where it is desired to prevent the generation of dust, the partition member 150 is used to separate each area by the above procedure. It is possible to prevent the generation of dust in each area during the period until the edge-cutting sheet 210 is laid, by spraying the dust-preventing agent 401 on the accumulated ash 102 after draining the stagnant water 102b in the partition member 150 with the partition. Like

Hereinafter, the procedure of the method for temporarily using the ash disposal site according to the embodiment will be described in detail.

"1. Method of partitioning sediment ash in a landfill"
FIG. 2 is a diagram for explaining a method of partitioning accumulated ash in a landfill according to the embodiment. FIG. 2A is a cross-sectional view showing a landfill, for example, a coastal landfill 100, which has a predetermined area (area) by a revetment bank 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. 2B 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. 3A and FIG. 3B are diagrams 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. 3A(a) shows a state in which a hose 150 is installed as a hollow elastic body that partitions the area A shown in FIG. 2(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. 3A (a). This hose 150 should be assembled manually, for example, by assembling a scaffold along the boundary part of the area A shown in FIG. 2(b) (a part in contact with the areas B and C), and manually installed by the worker on the scaffold. 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. 3A(b), the inside of the hose 150 installed for the area A is filled with, for example, water 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. 3A(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. 3A(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. 3B(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. 3B(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.

As a result, as shown in FIG. 3B(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. 3B(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 edging sheet 210 are removed, so that the area A is filled with water 102b on the accumulated ash 102 shown in FIG. 2A. 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. 2B, the boundaries of the areas A to F are set to be arc-shaped, 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. 4 is a diagram illustrating 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 on the accumulated ash 102 shown in FIG. 2A, or another area after partitioning the area A shown in FIG. 3A(b). In this area (area B), etc., the accumulated ash 102 is covered with water 102b.

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 installed, a predetermined amount of dust prevention agent (corresponding to reference numeral 170 in FIG. 1) 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. 3A, FIG. 3B, 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. 5 is a diagram illustrating dust prevention in a water retention area according to the embodiment. In the embodiment, as shown in FIG. 3A(b), after draining the stagnant water 102b in the partitioned area A, 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. 5B, the edge cutting sheet 210 described above is laid on the scattered dust prevention 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. 6 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 S601).

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 S602). 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 generation of dust before laying edge-cutting sheet for each area", the step S603 is carried out. In step S603, dust prevention agent 401 is sprayed in area A (step S603). 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 S602 or step S603, the edge cutting sheet 210 is laid on the accumulated ash 102 in this area A (step S604). Thereafter, the edge cutting sheet 210 is covered with the earth and sand 220 (step S605). 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 S605, one area A can be temporarily used. After that, when the area to be temporarily used is continuously expanded, the processes after step S601 may be repeated.

FIG. 7 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. 7 can be carried out at any place in the landfill 100, but here, an application example will be described in which the landfill 100 shown in FIG. 6 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 S601 of FIG. 6, the partition frame 300 is installed at a desired position in this area A (step S701). After that, a predetermined amount of the solidifying material is put into the inside of the partition frame 300 (step S702). 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 S703), and 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 S704). 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 S705). 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 S602 shown in FIG. 6 may be performed.

In addition, in step S705, 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 S603.

According to the embodiment described above, when temporarily using the land of the landfill where the accumulated ash of the used coal has accumulated water, the temporary use of the landfill Partition the area of land to be drained, drain water in the area to the outside of the area, sprinkle dust prevention agents on the area, lay a flexible resin edge cutting sheet on the area, and place earth and sand on the edge cutting sheet. The step of covering the soil is carried out. As a result, it is possible to prevent the generation of dust even when the accumulated ash in which the coal ash in the area target area has accumulated dries before the edge cutting sheet is installed in the area. In addition, it is possible to prevent the generation of dust in units of areas that partition the entire large landfill site, and to suppress the generation of dust as much as possible.

In the step of partitioning the area, a hollow flexible elastic body of a predetermined length is installed along the boundary of the area, the medium is filled inside the hollow elastic body, and the hollow elastic body is expanded. You can partition the area. As a result, it is possible to efficiently partition the area using the hollow elastic body, which is much easier to handle than the conventional embankment using heavy equipment, and the work for partitioning the area can be performed efficiently. Like

In this regard, conventionally, the embankment was performed to partition the ash disposal site into areas, but in the embankment, it will be partitioned in a larger area compared to the embodiment, and dust will be generated in a wide range, and The embankment itself took time. Furthermore, it took time to drain the remaining water and it was not possible to streamline the land preparation work including dust prevention. On the other hand, in the embodiment, the area can be easily partitioned by the hollow elastic body, the land can be created more efficiently and at lower cost than the conventional one, and the dust generation during the land creation can be performed efficiently. You will be able to prevent it.

In addition, each time the area is changed, in the process of partitioning the land area, the medium inside the hollow elastic body is discharged to shrink the hollow elastic body, and the hollow elastic body is moved to temporarily use the area of the land next time. It is also possible to repeat the process in which the hollow elastic body is filled with a medium to expand the medium, after being installed along the boundary portion of. By doing so, it becomes possible to efficiently construct land for temporary use in each area that partitions a vast landfill.

In addition, if there is a target area for ground improvement in the area, a partition frame surrounding the target area will be installed in the partitioned area, and solidification material will be put into the water in the partition frame to prevent water in the partition frame. Stirring, draining the residual water, putting the dustproofing agent in the partitioning frame with the partitioning frame installed, and then laying the edging sheet and covering the edging sheet with earth and sand. And it is sufficient. As a result, it is possible to spray the dust prevention agent following the step of ground improvement, and in this case, using this partition frame while leaving the partition frame used during ground improvement, dust generation in the target range is also possible. It becomes possible to prevent it efficiently. The solidified material charged into the water retention remains in the partition frame and does not flow out to the outside even at the time of stirring after charging. As a result, both ground improvement and dust prevention in the target range can be efficiently performed. In addition, since the residual water is drained for each target area partitioned by the partition frame, the target area after draining is only a part of the entire landfill area. This makes it possible to prevent the accumulated ash from scattering as dust even if the accumulated ash is dried before the dust prevention agent is sprayed after the drainage.

INDUSTRIAL APPLICABILITY As described above, the present invention can be applied to the dust prevention technology for landfills, and is particularly useful for the technology for utilizing a part of a vast landfill.

100 landfill (ash disposal site)
102 accumulated ash 102a slurry ash 102b water retention 150 partition member (hose)
205 Submersible pump 207 Fixture 210 Edge cutting sheet 220 Earth and sand (cover)
230 Heavy equipment 300 Partition frame 330a Stirrer 401 Dust prevention agent A to F area

Claims (4)

A method for preventing dust in a landfill, in which accumulated ash of used coal is accumulated, and water is spread over the accumulated ash,
Partition the land area for temporary use from the landfill,
Draining the water retention in the area to the outside of the area,
Disperse the dust control agent in the area,
Laying a resin edge cutting sheet with flexibility in the area,
Covering the edge cut sheet with earth and sand,
A method for preventing dust in a landfill, characterized by including a process. The step of partitioning the area is
A hollow and flexible hollow elastic body of a predetermined length is installed along the boundary of the area,
The inside of the hollow elastic body is filled with a medium, and the hollow elastic body is expanded to partition the area,
The method for preventing dust in a landfill according to claim 1, wherein: Every time you change the area,
In the step of partitioning the area of the land, the medium inside the hollow elastic body is discharged to contract the hollow elastic body,
After moving the hollow elastic body and installing it along the boundary portion of the area of the land to be temporarily used next, the inside of the hollow elastic body is filled with a medium and expanded.
The method for preventing dust in a landfill according to claim 2, wherein the steps are repeated. If there is a target area for ground improvement in the area,
In the area that is partitioned, further install a partition frame that surrounds the target range,
Put a solidifying material into the water retention in the partition frame,
Stir the water retention in the partition frame,
Draining the water retention,
With the partition frame installed, put the dust prevention agent in the partition frame,
After that, lay the edge cutting sheet,
Covering the edge cut sheet with earth and sand,
The method for preventing dust in a landfill according to any one of claims 1 to 3, which is characterized in that.

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