JP3023410B1 - A method for treating and disposing of waste by layering it underground. - Google Patents

Abstract

An object of the present invention is to provide a method of treating and disposing of waste by stacking it underground in a hierarchical manner. The method comprises a concrete or steel material with a caisson-style cutting edge and a composite layer 3 on the surface. The waste 7 is carried in and placed on the substructure 2 which has been placed, and the whole is surrounded by a cement-based filler 4 and a composite layer 3 ′. At this time, a sampling pipe 15 is buried in the permeable layer. After that, a concrete structure is formed on the composite layer, and then the same work steps as described above are repeated for other waste articles 7 ', 7 ",. And a concrete layer is formed thereabove to obtain a solidified waste 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of treating waste underground in a hierarchical manner.

[0002]

2. Description of the Related Art In recent years, there has been a problem of treating and disposing of wastes, especially so-called radioactive wastes, specially controlled industrial wastes, and incineration ash from garbage incineration plants. That is, when such waste is unnecessarily dumped, the impact on the environment is extremely significant, and the disposal of waste is subject to the conditions stipulated by laws and regulations.

[0003] Even less waste, such as so-called non-burnable garbage, industrial waste, etc., still poses a problem, even if these wastes are dumped into a remote mountain in a manner that eliminates pollution. ing.

[0004]

In view of the above, the object underlying the present invention is to deal with the disposal of waste, especially so-called radioactive waste, specially controlled industrial waste, and incinerated ash from garbage incineration plants. It is an object of the present invention to provide a method for rationally disposing of a limited site in a manner compliant with laws and regulations without compromising the environment as much as possible.

[0005]

According to the present invention, the above object is achieved by the following working steps 1 to 8, namely: At a location suitable for dumping waste, a substructure with a caisson-style cutting edge, a composite layer buried in the upper part and an excavation space in the lower part should be 1. Build on the ground so that it is almost equal to the surface of the mountain. 2. Load and place heavy waste by suitable means on the composite layer of this substructure; 3. A cement-based filler, a composite layer, and then a cement-based filler are cast all around the waste to surround the waste and form a solidified waste. 4. forming a further composite layer on the upper surface of the solidified waste solidified by incorporating the waste; 5. Excavating the solidified substructure at the bottom of the excavation space by appropriate excavation means to settle the composite layer on the upper surface of the substructure to such an extent that it is equal to the surface of the ground; 6. A concrete structure for dumping the next waste is formed on the upper part of the composite layer, and another waste is carried in and placed on the concrete structure. 7. Then, the above-mentioned working steps 3 to 6 are repeated to bury various wastes. It consists of an operation process in which concrete is cast at an appropriate thickness on the upper surface of the top floor of a solidified concrete structure containing waste embedded at a predetermined height and solidified to form a buried body. It is solved by.

In the present invention, the purpose is to protect the environment,
Sampling pipes for detecting leaching water (leakage water) from the composite layer are buried in the permeable layer for each composite layer of each solidified waste, so that the sampling pipes pass through the earth and sand discharge shaft, and the final disposal It extends to the ground when forming solidified material. In the present invention, as the waste, radioactive waste, specially controlled industrial waste and incineration ash from garbage incineration plants, and heavy wastes,
Of course, it is not limited to such waste. That is, as long as the waste must be buried in the ground or the like and can be buried, it can be applied to any type of waste.

The present invention will be described in detail with reference to embodiments of the invention illustrated in the accompanying drawings.

[0008]

FIG. 2 to FIG. 7 are views showing an example of the working steps of a method for treating and disposing of wastes, which is carried out in a hierarchical manner underground according to the present invention. In this case, FIG.
FIG. 3 is a plan view when heavy waste shown in FIG. 2 is carried into a dumping position.

As can be seen from FIG. 2, an area is selected so that the dumping of the waste does not adversely affect the surrounding environment. The ground 1 is leveled at a fixed area, and a steel structure or a concrete structure having a caisson-style cutting blade, which is a foundation structure 2, is set or cast thereon. A composite layer 3 is buried in the upper part of the steel structure or concrete structure which is the basic structure 2. This composite layer 3 has the structure shown in detail in FIG. 8 and comprises a water-blocking layer 3.1 and a water-permeable layer 3.2. The water-blocking layer 3.1 further comprises a self-healing water-blocking sheet made of various water-blocking substances, for example, bentonite in the embodiment of the present invention. B.

This substructure 2-steel or concrete structure-has an excavation space A at its lower part.
Here, as shown in FIG. 1, waste to be dumped, for example, heavy waste 7 (in the embodiment of the invention shown in FIGS. 1 to 4, for example, plant equipment waste) 5, the used excavator, in the embodiment of the invention shown in FIG. 5, for example, radioactive waste 7 ', and in the embodiment of the invention shown in FIG. ″) Is loaded onto the waste loading surface 2 ′ of the substructure 2 by a suitable means and placed thereon.

Next, the waste is surrounded by the composite layer 3 '. In the embodiment of the invention shown in FIG. 3, the surroundings are built around a mold 14, and are arranged along the mold and at intervals from the mold via a spacer or the like. The composite layer 3 'is erected, and the entire periphery of the waste 7 is
This is performed by placing the cement-based filler 4 so that the waste 7 is buried. At this time, the cement-based filler 4 is also cast between the composite layer 3 'and the mold 14, and the composite layer 3' (FIG. 8) standing up is folded at an appropriate height, and the waste 7 is removed. Surrounding, and furthermore, a cement-based filler 4 is cast on the folded composite layer 3 'and then solidified. Thus, the solidified waste 8 surrounding the waste is completed (see FIG. 4).

The solidified waste body 8 is formed with a composite layer 3 ″ (FIG. 8) above it for the next waste.
As can be seen from the finished solidified body 11 shown in FIG. 7, for each of the solidified layers of the solidified waste in the form shown in FIG. A sampling pipe 15 for detecting harmful seepage water (leakage water) from 3, 3 'is laid so as to communicate with the earth and sand discharge shaft 9, but the above-mentioned composite layers 3, 3', 3 "
The composite layer used for subsequent waste is treated similarly.

When the (finished) waste solidified body 11 is finally constructed, the sampling pipe 15 is extended to the ground. Of course, in this case, the sampling pipe 15 is provided so as not to hinder the sediment discharge performed via the sediment discharge shaft 9. This sampling pipe 15 is extended to the ground when it is finally buried, and is connected to a monitoring mechanism (not shown) in a manner not shown as well. This is advantageous because it is configured so that it can be performed for each physical layer.

In addition, the sampling tube 15 can be used in a suitable manner to inject the composite layers 3, 3 ', 3 "and the respective layers of damage, such as cement mortar, in the repair of the composite layers used for waste. The structure of the composite layer 3, 3 ', 3 "and the composite layer used for the following waste is shown by way of example in an embodiment of the present invention as shown in FIG. However, the present invention can be carried out in various other ways, for example, by using a bentonite mixed soil.

[0015] The mounting of the formwork 14 described above may be in a conventional manner and can therefore be effected in various ways. Here, as the next work step, the bottom excavation airspace A is machined by a suitable excavation means 12, for example, as shown in FIG. Excavation is performed by the excavation method, open caisson method, or pneumatic method, or, for example, by the excavation method using a mud shield, and the solidification is performed by digging and solidifying the waste inside the composite layer and the filling material. The body 8 (concrete structure) sinks by its own weight. At this time, the sedimentation is carried out to such an extent that the composite layer 3 ″ formed on the upper surface of the solidified body 8 covering the waste has the same level as the ground. Of course, the sediment generated by excavation passes through the sediment discharge shaft 9 It is discharged by suitable means 13 (FIG. 4).

Next, as shown in FIG. 5, a concrete structure 2 "is cast on the composite layer 3". In this way, the preparation for carrying in the next waste is completed. As shown in FIG. 5, on a concrete structure 2 ″ on a composite layer 3 ″ formed above the settled substructure 2, in order to dump the next waste, although the timing is not fixed. , Another waste 7 '(for example, radioactive waste enclosed in a suitable container) is carried in and placed, and the above-described operation steps are repeated to form a solidified body 8 containing the waste, Next, as shown in FIG. 6, waste 7 "(for example, waste incineration ash) is dumped on the composite layer (not shown) formed on the solidified body and the concrete structure 2" above the composite layer. . Thereafter, the above operation steps are repeated to form a solid body containing the waste.

In this case, every time a solidified body is constructed in this manner and the solidified body is completed, by excavating the bottom excavation space A by an appropriate excavating means 12 in the same manner as in the work process shown in FIG. The solidified body is settled by its own weight until the surface of the composite layer thereon becomes equal to the surface of the ground 1. In the work step shown in FIG. 7 as the final method work step, after the dumping of the waste 19 on the top floor, the above steps are completed, and the solidified body which is the waste solidified structure is finished. After being constructed, and after the excavation of the underground airspace A is completed, finally, concrete is cast on the upper surface with an appropriate thickness, preferably in the same level as the ground, and is disposed of underground in a hierarchical manner. The waste solidification structure 11 in which the objects are buried (finished) is constructed (FIG. 7). At this time, the sampling tube 15 is extended to the ground as described above (FIG. 7).

According to the present invention, in order to avoid the influence of rainwater and the scattering of dust on the surroundings and the hindrance of the environment, the method of FIG. It is proposed to operate the dumping facility under the cover 10, as shown in FIG. The cover 10 can be stretched in various ways, for example as a tent in the simplest embodiment of the invention.

[0019]

The method according to the invention enables deep waste disposal on land with a limited surface area. Also,
Stationary disposal and solidification of waste on or near the ground is possible, and there is no need to dispose after excavation at a large depth.Therefore, a large-sized waste hoist becomes unnecessary, And safe and reliable disposal can be expected.

Further, the same disposal can be performed on the adjacent land, so that the land can be used effectively. Access to a tunnel or the like up to the disposal depth normally required for large-scale disposal is not required, and disposal on a small-scale land without restriction is possible.

[Brief description of the drawings]

FIG. 1 is a plan view of the working process shown in FIG.

FIG. 2 is a sectional view showing a first step of the method according to the present invention.

FIG. 3 is a sectional view showing a second step of the method according to the present invention.

FIG. 4 is a sectional view showing a third step of the method according to the present invention.

FIG. 5 is a sectional view showing a fourth step of the method according to the present invention.

FIG. 6 is a sectional view of a working process in which the method according to the present invention is performed under a hood for environmental protection.

FIG. 7 is a cross-sectional view of a solidified construction of waste buried by the method according to the invention.

FIG. 8 is a detailed view of a composite layer used in the method according to the invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Substructure 2 'Waste carry-in surface 2 "Concrete structure 3 Composite layer 3' Composite layer 3" Composite layer 3.1 Water barrier 3.2 Water permeable layer B Bentonite layer 4 Cement-based filler 7, 7 ', 7 "Waste 8 Concrete structure 9 Excavated earth and sand discharge shaft 10 Cover 11 (Finished) Waste solidified structure 12 Drilling means 13 Transport means 15 Sampling pipe 19 Top floor Waste A Drilling airspace

Continuation of the front page (72) Inventor Jun Imai 4-9-1-9 Akasaka, Minato-ku, Tokyo Inside Soil Development Co., Ltd. (56) References JP-A-57-96193 (JP, A) JP-A-61- 159200 (JP, A) JP-A-62-21100 (JP, A) JP-A-63-150700 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G21F 9/36 G21F 9 / 34

Claims (4)

(57) [Claims] In a method for treating and disposing of wastes by stacking them underground hierarchically, the following work steps 1 to 8 are carried out: At a location suitable for dumping waste, a substructure (2) equipped with a caisson-style cutting blade, embedded with a composite layer (3) at the top and excavating airspace (A) at the bottom. ) Is constructed on the ground (1) such that the waste carrying surface (2 ') is substantially equal to the ground surface, 2. A heavy waste (7) is carried in and placed by appropriate means on the composite layer (3) of the substructure (2); Cement-based packing (4) around the entire waste
3. A composite layer (3 ') and then a cementitious filling (4) is cast around this waste to form a solidified waste (8); 4. A further composite layer (3 ″) is formed on the solidified waste solidified body (8) in which the waste (7) is embedded and solidified, and 5. The bottom of the solidified substructure (2) is then formed. 5. Excavation of the excavation airspace (A) by an appropriate excavation means (12) to settle the composite layer (3 ″) on the upper surface of the substructure (2) to an extent that the composite layer (3 ″) is equal to the surface of the ground. A concrete structure (2 ") for the next waste dumping is formed on the upper part of the composite layer (3"), and another waste (7 ') is carried on the concrete structure (2 "). 7. After that, by repeating the above-mentioned work steps 3 to 6, various wastes are buried, and 8. The wastes (7, 7 '...) Buried at a predetermined height are buried. A waste process comprising the steps of: placing concrete with an appropriate thickness on the upper surface of the uppermost floor of a built-in solidified concrete structure, solidifying the solidified structure, and forming a buried body (11). Of disposal by stacking in a hierarchical manner. 2. The method according to claim 1, wherein the composite layer (3, 3 ', 3 ") comprises a water-impermeable layer (3.1) and a water-permeable layer (3.2). 3. A sampling pipe (15) for detecting effluent from the composite layer (3, 3 ', 3 "...) Is provided with a solidified waste (8) and a final solidified body (19). The sampling pipe is buried in the permeable layer of each of the composite layers (3, 3 ', 3 "...) So as to pass through the earth and sand discharge shaft (9) to form a solidified waste product (11). 2. The method according to claim 1, wherein the extension is performed to the ground. 4. Covering the dumping process for environmental protection (10)
2. The method of claim 1, wherein the method is performed within.