JP2003062534A - Final storage facility of waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a final storage facility of waste, which facilitates selection of a suitable place, doesn't exert a malinfluence on peripheral environment and decrease a construction and maintenance cost. SOLUTION: The final storage facility of waste is provided with a peripheral wall portion 6 formed with a steel sheet pile 5, which is driven into the ground G by arranging frame-like, an inside wall portion 8 formed with a steel plate 7, which is attached and disposed on the inside of the steel sheet pile 5, a bottom portion 10, which is formed with a steel plate 9 and partitions a waste storage space together with the inside wall portion 8 by joining the circumference to the bottom end portion of the inside wall portion 8, a leaching water collection drainage pipe 3, which is disposed on the upper side of the bottom portion 10, and a groundwater collection drainage pipe 4, which is disposed on the lower side of the bottom portion 10, and the steel sheet pile 5 restricts the inflow of groundwater to the lower side of the bottom portion 10 at the inside of the peripheral wall portion 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a final waste storage facility having groundwater countermeasures and a construction method thereof.

[0002]

2. Description of the Related Art A landfill storage facility for general waste or industrial waste is often provided in remote mountain areas or along the shore. Among such landfill storage facilities, in the case of a managed final storage facility (final disposal facility), efforts are being made to promote purification of the wastewater through natural metabolism of the wastewater, but as a result, rainwater permeates the wastewater. As sewage is produced, the sewage is temporarily stored in a regulating pond, purified at a water treatment facility, and then discharged.

This water treatment is continued until the waste is purified and stabilized, but generally the period required for stabilization is 20.
It is said to be ˜30 years, and during such a long period, sewage may infiltrate underground and contaminate nearby soil and groundwater, possibly resulting in environmentally unfavorable results.
Therefore, in order to prevent soil and groundwater from being contaminated, a water-blocking work such as a water-blocking sheet has been conventionally performed, and FIG. 5 shows an example of the conventional landfill storage facility. Here, reference numeral 1 in the figure is a storage recess formed by digging the ground G in a mortar shape,
Reference numeral 2 is a water-blocking sheet, 3 is an upper side of the water-blocking sheet 2, and a leachate collection and drainage pipe connected to a water treatment facility (not shown), 4 is a lower side of the water-blocking sheet 2. The groundwater collection and drainage pipe, S is waste, and WH is the groundwater upper surface. In such a conventional landfill storage facility, the waterproof sheet 2
If there is a cause such as poor construction or lack of strength, there is a problem that the water blocking sheet 2 is broken by the water pressure of the leachate from the waste S stored in the landfill storage facility, and the sewage leaks from there. On the other hand, in the case of a facility that temporarily stores the waste S, measures against sewage are usually not taken.

Further, in conventional landfill storage facilities for general waste, since storage recesses are often provided on the ground surface such as valleys, landfill capacity is often limited depending on the topography and ground conditions. Therefore, the landfill area required for waste disposal often increases. And in the conventional landfill storage facility for general waste,
Since there is no roof, the size of the landfill area is large and the amount of leachate that permeates the waste is also large. As a result, it is necessary to make the capacity of the regulating pond extremely large and the water treatment facility is also large. Need to

As described above, in the conventional waste landfill storage facility, there is a problem that the effective use of the land is hindered as the facility becomes larger, and in addition, the construction cost and the water treatment cost become expensive. There is also a problem in management that the water leakage is more likely to occur as the water blocking area increases.

[0006]

Therefore, there are the following specific problems. (1) It is difficult to select a suitable place. In general, candidate sites for construction of storage facilities are limited to places where groundwater is difficult to come out, because water-blocking sheets are installed. For this reason, it is difficult to select suitable sites.

(2) When a storage facility is constructed on soft ground, adverse effects occur. (a) When groundwater is drained for the construction and maintenance of storage facilities, the surrounding environment may be adversely affected, such as landslides and subsidence. (b) When constructing a storage facility on soft ground, the cost for ground improvement (groundwater treatment, etc.) will increase and the construction cost will rise. (c) If a water barrier sheet is installed on the ground where countermeasures against groundwater have been taken, the water barrier sheet may be partially pulled and damaged due to buoyancy due to groundwater, differential settlement of soft ground, etc. Even after the construction of the facility, it is necessary to continue draining groundwater to permanently lower the groundwater level. (d) When a waterproof sheet is installed on the sand ground, the sand particles are carried away along with the spring water, so it is easy to create a cavity on the back side (outside) of the waterproof sheet. The impermeable sheet on the part facing the cavity is damaged.

[0008]

[Means for Solving the Problem and Its Action / Effect] The present invention aims to provide a final storage facility that advantageously solves the above-mentioned problems. The final waste storage facility of the present invention is An outer peripheral wall portion formed by steel sheet piles arranged in a frame shape in the ground, an inner peripheral wall portion formed by a steel plate attached to the inner surface of the steel sheet pile, and the inner peripheral wall formed by a steel sheet A bottom surface of which a peripheral edge is joined to a lower end of the bottom portion to define a waste storage space together with the inner peripheral wall portion, a leachate collection / drainage pipe disposed above the bottom surface portion, and a bottom portion of the bottom surface portion. And a groundwater collecting and draining pipe disposed on the side, the steel sheet pile restricts the inflow of groundwater below the bottom surface portion inside the outer peripheral wall portion.

In such a waste final storage facility, it is substantially formed by a steel plate attached to the inner surface of the steel sheet pile of the outer peripheral wall formed by the steel sheet piles arranged in a frame and arranged in the ground. Waste is stored in the waste storage space defined by the inner peripheral wall part and the bottom part formed of a steel plate and having a peripheral edge joined to the lower end of the inner peripheral wall part, and leaching from the waste Water is sent to and treated by the leachate collection / drainage pipe arranged on the upper side of the bottom surface, for example, via a regulating pond or directly to a water treatment facility.
In this waste final storage facility, the steel sheet piles on the outer peripheral wall whose rooting length has been adjusted control the hydraulic gradient, allowing the inflow of groundwater below the bottom surface inside the outer peripheral wall. And the groundwater inside the outer peripheral wall that has been reduced due to the inflow restriction is drained by the groundwater collection and drainage pipe arranged below the bottom surface.

Therefore, according to the waste final storage facility of the present invention, when constructing on soft ground, it is not necessary to drive the steel sheet pile until it reaches the impermeable layer below the soft ground, so the length of the steel sheet pile is increased. Can be kept within a reasonable range, so that the construction cost can be suppressed, and further, the steel sheet pile restricts the inflow of groundwater to the lower part of the bottom part, so that the discharge amount of groundwater can be reduced. Furthermore, since the outer peripheral wall portion and the inner peripheral wall portion that defines the waste storage space and the bottom portion form a tank-like structure having rigidity, the waste is stored in the waste storage space to a certain extent or more. When the total weight of the tank structure and the waste stored in it exceeds the buoyancy added to the tank structure by the surrounding groundwater, stop draining groundwater from the groundwater collection and drainage pipe below the bottom part. Even though the waste storage space can be maintained, groundwater treatment costs and groundwater collection and drainage pipe maintenance costs (costs such as cleaning to prevent pipe clogging and replacement of corroded or damaged pipes) are reduced. be able to.

Therefore, according to the waste final storage facility of the present invention, the following effects can be obtained. (1) It becomes easy to select a suitable place. Conventionally, soft ground with a high groundwater level was unsuitable for the construction of storage facilities, but with the present invention, it is possible to build storage facilities on such soft ground as well, so a wide range of suitable sites can be selected. Become.

(2) It does not adversely affect the surrounding environment. (a) Since the discharge of groundwater is small, there is no risk of landslides or subsidence. (b) Since the outer wall, inner wall, and bottom that define the waste storage space form a rigid tank-shaped structure, buoyancy due to groundwater and uneven settlement of soft ground prevent It will not be damaged, and even if the sand grains are carried away with the spring water and a cavity is created on the back side (outside), the water impermeability will not be damaged, so the storage facility can be made safe. it can.

(3) Construction and maintenance costs are low. (a) Since the ground is dug vertically in this invention, the storage capacity is increased as compared with the conventional mortar-shaped storage facility. Therefore, with the same storage capacity, it is possible to significantly reduce the area of land used than before. (b) When constructing a disposal facility on soft ground, the cost for ground improvement (groundwater treatment, etc.) is small, and drainage of groundwater may be stopped if waste accumulates to the extent that it does not float due to buoyancy. Groundwater treatment costs and maintenance costs for groundwater collection and drainage pipes are also low.

The final waste storage facility of the present invention is
The steel sheet pile forming the outer peripheral wall portion and the steel sheet forming the inner peripheral wall portion may be filled and solidified, for example, a filler such as earth and sand or concrete may be provided. The parts of the steel plate that make up the peripheral wall that are not in close contact with the steel sheet pile are also supported by the steel sheet pile through the solidified filler, so even if the steel sheet is relatively thin, it will adhere to the steel sheet pile. The non-working part can sufficiently withstand the pressure applied from the waste. Here, in the case where, for example, earth and sand or concrete having a larger specific gravity than water is used as the filling material, a tank-shaped structure composed of an outer peripheral wall portion and an inner peripheral wall portion and a bottom portion which define the waste storage space is formed. Since the weight of the filler can be added, it is possible to prevent the above-mentioned tank-like structure from rising due to buoyancy from groundwater and stop drainage of groundwater from the groundwater collection and drainage pipe at a stage where less waste is generated. . Further, when earth and sand or concrete is used as the filler, it is possible to prevent rust from occurring on the surfaces of the steel sheet pile forming the outer peripheral wall portion and the steel sheet forming the inner peripheral wall portion facing each other.

The waste final storage facility of the present invention is
You may have the roof part which covers the said waste storage space,
By doing so, the amount of leachate is reduced, so that the scale of the water treatment facility can be reduced.

On the other hand, according to the construction method of the final waste storage facility of the present invention, steel sheet piles are driven in line in the ground in a frame shape,
The steel sheet pile forms an outer peripheral wall portion, the steel sheet pile restricts the inflow of groundwater to the inside of the outer peripheral wall portion, and the ground inside the steel sheet pile is dug to the extent that the steel sheet pile can stand by itself. A groundwater collector / drainage pipe is embedded in the bottom of the hole, a steel plate is attached to the inner surface of the steel sheet pile to the depth of the hole bottom, the inner peripheral wall is formed by the steel plate, and the inner wall is formed in the hole bottom. While forming a bottom surface portion with the steel plate provided, the peripheral edge of the bottom surface portion is joined to the lower end portion of the inner peripheral wall portion, the bottom surface portion and the inner peripheral wall portion to define a waste storage space, the bottom surface It is characterized in that a leachate collecting and draining pipe is arranged on the upper side of the section.

According to the method for constructing the final waste storage facility, when constructing on soft ground, it is not necessary to drive the steel sheet pile until reaching the impermeable layer below the soft ground, so the length of the steel sheet pile is increased. Since the construction cost can be suppressed within a reasonable range, the outer peripheral wall is formed by steel sheet piles that are punched in the ground in a frame shape to limit the inflow of groundwater to the inside and The ground inside the wall is dug to the extent that steel sheet piles can be self-sustaining to form a hole, and the groundwater collection and drainage pipe is buried at the bottom of the hole, and the groundwater inside the outer wall that has decreased due to the inflow restriction is cut into the bottom Since it is drained by the groundwater collection and drainage pipe, the cost for ground improvement (groundwater treatment, etc.) is low, and there is no risk of landslides or subsidence.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings by way of examples. 1 is a sectional view showing an embodiment of the final waste storage facility of the present invention, and FIG. 2 shows a part of the outer peripheral wall portion and the inner peripheral wall portion of the final waste storage facility of the embodiment. It is a perspective view, and in the figure, the same parts as those in the conventional example are denoted by the same reference numerals.

The final waste storage facility of this embodiment is shown in FIG.
As shown in FIG. 5, an outer peripheral wall portion 6 formed by a large number of steel sheet piles 5 which are arranged and driven into the ground G in a rectangular frame shape,
An inner peripheral wall portion 8 formed mainly by a large number of steel plates 7 attached by welding to the inner surfaces of the steel sheet piles 5, and a peripheral edge joined to the lower end portion of the inner peripheral wall portion 8 formed by a large number of steel plates 9. And a bottom surface portion 10 that defines a waste storage space together with the inner peripheral wall portion 8.

Here, in the steel sheet pile 5, the side edges are substantially watertightly combined with each other to form the outer peripheral wall portion 6 as a continuous wall, and the steel sheet 7 has the side edges of the steel sheet pile 5. A part of the inner surface of the steel sheet pile 5 is welded to the flat inner surface projecting inward of the outer peripheral wall portion 6 in a watertight manner (a vertically long portion exposed between the adjacent side end portions of the adjacent steel sheet 7). In addition, the inner peripheral wall portion 8 is formed as a continuous wall, and a space having a substantially trapezoidal cross section between each of the plurality of steel sheet piles 5 and the steel sheets 7 attached thereto has a specific gravity larger than that of water, for example. Filling materials such as earth and sand and concrete are filled and hardened.

If concrete is used as the filler, it is possible to prevent the surface of the steel sheet pile 5 and the steel sheet 7 facing each other from being oxidized, that is, rusting due to the alkaline nature of the concrete. Moreover, if the earth and sand excavated from the ground G or the like at the installation site of the facility is used as the filling material, it is possible to prevent the generation of rust on the above surface rather than leaving the space as it is, and the cost of the filling material. In that case, in order to harden the earth and sand or the rock in the space of the above-mentioned trapezoidal cross-sectional shape, it is sufficient to tamper with filling.

Here, the steel sheet 9 is welded in a watertight manner to each other at its side edges as shown in FIG. 2, and slightly inwardly toward the center (for example, a slope of about 5%). (At) The bottom surface portion 10 which is inclined is formed.

Further, as shown in FIG. 1, the final waste storage facility of this embodiment is placed in a groove 10a formed in the central portion of the bottom portion 10 and disposed above the bottom portion 10. It also comprises a leachate collection / drainage pipe 3 covered with a mesh cover 10b and a groundwater collection / drainage pipe 4 buried in the ground G below the bottom portion 10, and the leachate collection / drainage pipe 3 is illustrated. It is connected to a water treatment facility (not shown) via a pump and a regulating pond, and the leachate collection and drainage pipe 3 is connected to a general water discharge channel via a pump (not shown).

In the final waste storage facility of this embodiment, however, the steel sheet pile 5 of the outer peripheral wall portion 6 whose rooting length is adjusted is adjusted.
However, as shown in FIG. 1 for the groundwater upper surface WH, the hydraulic gradient is controlled to limit the inflow of groundwater below the bottom surface portion 10 inside the outer peripheral wall portion 6, and as shown by the arrow F in FIG. In order to prevent the inflow of groundwater, it is necessary to go under the lower end of the outer peripheral wall 6.

In the final waste storage facility of the embodiment, the outer peripheral wall 6 formed by the steel sheet piles 5 arranged in the ground G in a frame shape is attached to the inner surface of the steel sheet pile 5. An inner peripheral wall portion 8 substantially formed by the steel plate 7,
The waste S is stored in a waste storage space formed by the steel plate 9 and the bottom portion 10 having the lower end portion of the inner peripheral wall portion 8 joined to the peripheral edge thereof, and the leachate from the waste S is stored in the waste storage space. The water is drained by the leachate collection / drainage pipe 3 arranged on the upper side of the bottom portion 10 and sent to the water treatment facility through the adjustment pond for treatment.

Further, in the waste final storage facility of this embodiment, the steel sheet pile 5 of the outer peripheral wall portion 6 whose rooting length is adjusted is adjusted.
Controls the hydraulic gradient, and the bottom surface portion 10 inside the outer peripheral wall portion 6 is controlled.
The groundwater (spring water) inside the outer peripheral wall portion 6 that restricts the inflow of groundwater to the lower side of the bottom wall is drained by the groundwater collection and drainage pipe 4 disposed below the bottom surface portion 10. It is discharged to the general canal.

Therefore, according to the waste final storage facility of this embodiment, when constructing on the soft ground G, it is not necessary to drive the steel sheet pile 5 until it reaches the impermeable layer below the soft ground. Since the length of the sheet pile 5 can be set within an appropriate range, the construction cost can be suppressed, and moreover, the steel sheet pile 5 restricts the inflow of groundwater to the lower side of the bottom portion 10, so that the discharge amount of groundwater can be reduced. Further, the outer peripheral wall portion 6
And the inner peripheral wall portion 8 and the bottom surface portion 1 that define the waste storage space
Since 0 and 0 constitute a tank-shaped structure having rigidity, waste is stored in the waste storage space to a certain extent or more as indicated by symbol S ′ in FIG. If the total weight W of the waste S ′ and the waste S ′ becomes larger than the buoyancy B added to the tank-shaped structure from the surrounding groundwater, the bottom part 1
Since the waste storage space can be maintained even if the drainage of groundwater from the groundwater drainage pipe 4 on the lower side of 0 is stopped, the groundwater treatment cost and the maintenance cost of the groundwater drainage pipe 4 (for preventing pipe clogging) Therefore, it is possible to reduce the cost for cleaning and replacement of a corroded or damaged pipe).

When the inventor of the present application set a model of groundwater inflow to the bottom of the excavation part and analyzed the flow based on the finite element method using a computer, the groundwater level was 0.0 m and the depth of the excavation part was 3.5 m. , Ground permeability coefficient k = 1 × 10 -5 cm /
s, the analysis region depth is 60 m, and the analysis region width is 100 m (of which the excavation part length is 20 m), the length is 1 based on the above embodiment.
In the example model in which a 2 m steel sheet pile was driven into the ground until the upper end coincided with the ground surface to form an outer peripheral wall part having a thickness of 0.4 m and a depth of 12 m at the side end of the excavation part, The inflow of groundwater is 0.4m thick and the depth is equal to that of the excavated part.
It decreased to about 1/7 in the vicinity of the outer wall, and about 3 as a whole.
It was found to decrease by 6%.

Therefore, according to the waste final storage facility of this embodiment, the following effects can be obtained. (1) It becomes easy to select a suitable place. Conventionally, soft ground with a high groundwater level was unsuitable for the construction of storage facilities, but using this example, it is possible to build storage facilities on such soft ground, so it is necessary to select a suitable site. The width becomes wider.

(2) It does not adversely affect the surrounding environment. (a) Since the discharge of groundwater is small, there is no risk of landslides or subsidence. (b) Outer peripheral wall 6 and inner peripheral wall 8 defining the waste storage space
Since the bottom part 10 and the bottom part 10 form a rigid tank-like structure, the water-impervious state is not impaired by buoyancy due to groundwater and differential settlement of soft ground, and the sand grains are carried away along with the spring water. Even if a hollow is formed on the back side (outside), the water-impervious state is not impaired, so the storage facility can be made safe.

(3) Construction and maintenance costs are low. (a) In this embodiment, the ground G is dug vertically, so that FIG.
The storage capacity is larger than that of the conventional mortar-shaped storage facility as shown in. Therefore, with the same storage capacity, it is possible to significantly reduce the area of land used than before. (b) When constructing a disposal facility on soft ground, the cost for ground improvement (groundwater treatment, etc.) can be small, and drainage of groundwater may be stopped if waste accumulates to the extent that it does not float due to buoyancy. Also, groundwater treatment costs and maintenance costs for groundwater collection and drainage pipes are low.

Further, according to the final waste storage facility of this embodiment, the steel sheet pile 5 and the inner peripheral wall 8 forming the outer peripheral wall 6 are formed.
Since it comprises a filler that is filled and hardened between the steel sheet 7 and the steel sheet 7 that forms the inner wall 8, the portion of the steel sheet 7 that forms the inner peripheral wall portion 8 that is not in close contact with the steel sheet pile 5 is also the hardened filler material. Since it is supported by the steel sheet pile 5 via the steel sheet 5, even if the steel sheet 7 has a relatively small thickness, the portion not in close contact with the steel sheet pile 5 can sufficiently withstand the pressure applied from the waste S. In addition, here, because the filling material used is, for example, earth and sand or concrete having a larger specific gravity than water, a tank constituted by the outer peripheral wall portion 6, the inner peripheral wall portion 8 defining the waste storage space, and the bottom portion 10 is formed. Since the weight of the filler having a higher specific gravity than water can be added to the structure, it is possible to prevent the tank structure from being lifted up by the buoyancy from the ground water at a stage where the waste S is less, and to collect and discharge the groundwater. The drainage of groundwater from the pipe 4 can be stopped. The earth and sand or the concrete as the filling material can also prevent rusting on the surfaces of the steel sheet 7 and the steel sheet pile 5 facing each other.

FIGS. 3A to 3E show the procedure of an embodiment of the method for constructing the final waste storage facility of the present invention, which can be used in the construction of the final waste storage facility of the above embodiment. FIG. 3A is a sectional view, and in the construction method of this embodiment, first, FIG.
As shown in FIG. 3, the steel sheet piles 5 are arranged in the ground G in a frame shape, and the steel sheet piles 5 are driven to form the outer peripheral wall portion 6. Then, as shown in FIG. While restricting the inflow of groundwater to the inside of the wall 6, the steel sheet pile 5
The ground inside the ground is drilled to the extent that the steel sheet pile 5 can be self-sustaining while draining spring water with the pump 11 to form a hole P, and as shown in FIG. The collection / drainage pipe 4 is buried, and the inflowing groundwater is drained by the groundwater collection / drainage pipe 4 as shown by the arrow F, and the hole bottom PB
Is leveled and compacted, and then, as shown in FIG.
A steel plate 7 is additionally provided on the inner surface of the steel sheet pile 5 to the depth of the hole bottom PB, an inner peripheral wall portion 8 is formed by the steel plate 7 and a part of the inner surface of the steel sheet pile 5, and the steel sheet pile 5 is arranged on the hole bottom PB. The bottom plate 10 is formed of the formed steel plate 9, the peripheral edge of the bottom plate 10 is joined to the lower end of the inner peripheral wall 8, and the bottom surface 10 and the inner peripheral wall 8 define a waste storage space. Finally, as shown in FIG. 3 (e), the leachate collection / drainage pipe 3 is arranged above the bottom portion 10.

According to the method for constructing the final waste storage facility of this embodiment, when constructing on the soft ground G, the steel sheet pile 5 does not have to be driven in until it reaches the impermeable layer below the soft ground. Therefore, since the length of the steel sheet pile 5 can be set within a reasonable range, the construction cost can be suppressed, and the steel sheet piles 5 arranged in the ground G in a frame shape and driven into the outer peripheral wall 6
To limit the inflow of groundwater to the inside thereof, and to form a hole P by digging the ground inside the outer peripheral wall 6 to the extent that the steel sheet pile 5 can stand on its own, and collecting the groundwater at the hole bottom PB. Since the drainage pipe 4 is buried and the groundwater inside the outer peripheral wall portion 6 reduced by the inflow restriction is drained by the groundwater collection and drainage pipe 4 of the hole bottom PB, the cost for ground improvement (groundwater treatment, etc.) is small, There is no concern about landslides or subsidence.

FIG. 4 is a sectional view showing another embodiment of the final waste storage facility of the present invention. In the figure, the same parts as those in the previous embodiment are designated by the same reference numerals. That is,
The final waste storage facility of this embodiment includes a roof portion 12 that entirely covers the waste storage space defined by the inner peripheral wall portion 8 and the bottom surface portion 10 and the upper end portion of the outer peripheral wall portion 6, According to this embodiment, in addition to the same effects as the previous embodiment,
Since the amount of leached water from the waste S is reduced, the effect that the scale of the water treatment facility can be reduced can be obtained.

Although the present invention has been described above based on the illustrated example, the present invention is not limited to the above-mentioned example, and for example, the steel plate 7 can be used.
The side edges may be welded to each other to form the inner peripheral wall portion 8 only with the steel plate 7, and a filler other than earth and sand, rock, or concrete may be filled. The length of the steel sheet pile 5 (driving depth) is such that the steel sheet pile 5 is self-supporting even if a hole of a predetermined depth is dug and the head of groundwater can be reduced to a desired degree inside the outer peripheral wall. If so, it can be appropriately determined according to the geology of the ground, the condition of groundwater, and the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a final waste storage facility of the present invention.

FIG. 2 is a perspective view showing a part of an outer peripheral wall portion and an inner peripheral wall portion in the final waste storage facility of the above embodiment.

3 (a) to 3 (e) are cross-sectional views showing the procedure of one embodiment of the method for constructing the final waste storage facility of the present invention, which can be used when constructing the final waste storage facility of the above embodiment. It is a figure.

FIG. 4 is a sectional view showing another embodiment of the final waste storage facility of the present invention.

FIG. 5 is a cross-sectional view showing an example of a conventional landfill storage facility.

[Explanation of symbols]

1 Storage recess 2 waterproof sheet 3 Leachate collection drainage pipe 4 Groundwater collection and drainage pipe 5 steel sheet pile 6 Outer wall 7 Steel plate 8 Inner wall 9 steel plate 10 Bottom part 11 pumps 12 roof B buoyancy G ground F Inflow groundwater P hole PB hole bottom S waste W total weight WH Groundwater top surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Nagata             4-44 Shibaura, Minato-ku, Tokyo Co., Ltd.             Inside the Yokogawa Bridge F-term (reference) 4D004 AA46 BB04

Claims (4)

[Claims] 1. An outer peripheral wall portion formed by steel sheet piles arranged in a frame shape in the ground, an inner peripheral wall portion formed by a steel sheet attached to an inner surface of the steel sheet pile, and a steel sheet. A bottom surface portion that is joined to the lower end portion of the inner peripheral wall portion and defines a waste storage space together with the inner peripheral wall portion, and a leachate collection and drainage pipe disposed above the bottom surface portion, A groundwater collection and drainage pipe disposed below the bottom surface portion, wherein the steel sheet pile restricts the inflow of groundwater to the lower side of the bottom surface portion inside the outer peripheral wall portion. A final waste storage facility characterized by. 2. The waste according to claim 1, further comprising a filling material filled and solidified between the steel sheet pile forming the outer peripheral wall portion and the steel sheet forming the inner peripheral wall portion. Final storage facility for goods. 3. The final waste storage facility according to claim 1, further comprising a roof portion that covers the waste storage space. 4. The steel sheet piles are arranged in a frame shape in the ground to drive the steel sheet piles to form an outer peripheral wall portion, and the steel sheet piles restrict the inflow of groundwater to the inside of the outer peripheral wall portion. A hole is formed by digging the ground inside the steel sheet pile to the extent that the steel sheet pile is self-sustaining, and a groundwater collection and drainage pipe is embedded in the hole bottom, and a steel sheet is attached to the inner surface of the steel sheet pile to the depth of the hole bottom. Then, the inner peripheral wall portion is formed by the steel plate, and the bottom surface portion is formed by the steel plate disposed on the hole bottom,
Joining the peripheral edge of the bottom surface portion to the lower end portion of the inner peripheral wall portion,
A method for constructing a final waste storage facility, characterized in that a waste storage space is defined by the bottom surface portion and the inner peripheral wall portion, and a leachate collection and drainage pipe is disposed above the bottom surface portion.