JP3157017B2 - Environmental protection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an environmental protection method,
Especially around areas that are contaminated or at risk of contamination,
The present invention relates to an environmental preservation method for constructing a barrier to prevent the movement of pollutants from the area to the surroundings and preventing the influence on the environment.

[0002]

2. Description of the Related Art With the development of industry and the diversification of urban life, the problems of industrial waste and municipal waste have been greatly highlighted. In particular, in addition to an increase in the amount of waste treated, harmful substances contained in the waste, such as heavy metals such as mercury, cadmium, and chromium, flow out to living areas, for example, through groundwater.

[0003] For this purpose, it is a suitable solution to construct a blocking wall around a contaminated or at risk of contaminant to prevent the transfer of contaminants from that region to the surroundings. Indeed, it has been conventional to build concrete walls around the area, or even concrete impermeable walls at the bottom.

However, concrete walls have a high possibility of permeating heavy metals, and when cracks occur, they will intensively flow out therefrom.

On the other hand, Japanese Patent Application Laid-Open No. Sho 61-105500 proposes that a material having a high barrier property for heavy metals is injected into cracks or the like of a barrier wall.

[0006]

However, as far as it is considered only from the interruption of heavy metals and the like, it cannot be dealt with at all if cracks occur due to external factors such as earthquakes or aging.

[0007] Therefore, a main object of the present invention is to provide an excellent contaminant blocking or trapping property.

[0008]

SUMMARY OF THE INVENTION The above objects have been attained by the following problems.
Or around an area where there is a risk of contamination.
Construction of a barrier to prevent the movement of pollutants to the side
At the same time, a transparent
While burying a hollow holder with a plurality of holes,
Solidification of the solidifiable material simultaneously with or after insertion of the carrier
Before starting, insert a flexible bag into the hollow holder to solidify
Before the solidification of the material starts, inflate the bag in the hollow holder,
At least until the solidified material loses its fluidity
Condition and then shrink the bag to remove
And remove the pollutants in the removed space.
This can be solved by providing a substance.

[0009] In addition, there is a through hole in a pre-drilled trench.
Do not bury the hollow holder, and between the hollow holder and the digging trench
Of the hollow holding body
Through holes in the wall from the part to communicate inside and outside
Buried hollow holder having a plurality of
May be provided with a contaminant trapping substance.

On the other hand, there is a possibility of contamination or contamination.
Move the contaminants around the area from the area to the surroundings
In the method of constructing a blocking wall to block,
A plurality of through-holes in the excavated trench, and the through-holes
Buried hollow holder sealed with
Solidify with a solidifying material between the groove and the hollow.
Break or remove the sealing material from the inside of the holder,
It is also possible to provide a trapping substance for the pollutants in the empty holder.
Wear. The trapping substance used in the aforementioned method has a trapping capacity.
It can also be replaced if it drops or runs out.

Further, the capturing substance is filled in a cassette holder having a large number of through holes having a size that does not transmit the capturing substance,
This cassette can be inserted into the hollow holder at least after the point at which the flowability of the solidified material is lost.

[0012]

According to the present invention, a hollow holding body having a plurality of through-holes communicating with the inside and outside is buried in a digging trench excavated in advance, and the contaminant trapping substance is provided therein. Therefore, when the contaminant enters the hollow holding body through the through hole, the contaminant is trapped by the trapping substance in the inside and the further flow can be prevented. Thus, in the present invention, the blocking of pollutants is not based on the liquid tightness of the material, but is made from the viewpoint of capturing and blocking the pollutants,
Therefore, even if cracks etc. occur on the blocking wall,
Since the outflow to the surroundings can be prevented, the reliability is high.

Further, by relying solely on the pollutant trapping effect, if trapped substances are present in the barrier, the barrier is mainly used to block the pollutants. When the substance is captured by the capturing substance, a double blocking effect is exhibited, and the reliability of the blocking is increased.
Therefore, it is desirable to fill the space between the excavation groove and the hollow holding body with the solidified material. In this case, when the previously inserted a space-forming member into the hollow holding body, it is possible to <br/> prevent entry into the hollow holding body liquid. After that, after the solidification between the hollow holding body and the excavation trench with the solidifying material is attempted, the space forming body is removed from the hollow holding body, and a space can be formed at the place where the space forming body is removed, and contaminants in this space are formed. A capture substance can be provided.

On the other hand, when the length of the excavation groove of the hollow holding body is increased, one hollow holding body, for example, a thin rectangular box can be provided in one excavation groove, but the shape is anyway in the longitudinal direction of the excavation groove. Even if a plurality of juxtaposed at intervals, the liquid containing the contaminant that has entered the blocking wall easily penetrates into the hollow holding body when there is a pressure difference between the hollow holding body and the wall body, The contaminants are trapped. Therefore, the material cost is reduced and the construction method is simplified as compared with the case where the continuous wall of the trapping substance is constructed.

The space forming body may be solid or hollow. Further, the space forming member may be inserted at the same time as or after the insertion of the hollow holding member.

Further, in the case of forming the space forming body, a flexible bag is inserted into the hollow holding body at the same time as the insertion of the hollow holding body or before the solidification of the solidifying material is started, and thereafter, the solidification material is formed. Before the start of solidification, the bag is inflated in the hollow holder by injecting air or liquid, for example, and is maintained in an inflated state at least until the solidified material loses fluidity. Can be removed from In this case of using the bag, with the bag in the hollow holding body can be reliably prevented from entering the solidification material into the interior in good contact, it is possible to perform the dismantling very easily.

On the other hand, the hollow holder may not have a through-hole. In this case, after the hollow holder is buried, the space between the hollow holder and the excavation groove is solidified with a solidifying material. Then, if a plurality of holes are formed in the wall from the inside of the hollow holding body, it is possible to introduce the contaminant into the inside. Another similar technique is to embed a hollow holder having a plurality of through-holes in a pre-drilled pit and the through-holes being sealed with, for example, a hot-melt or breakable sealing material. Then, solidification between the hollow holding body and the excavation groove is performed by a solidifying material, and then the inside of the hollow holding body is heated with a gas torch or the like to break or remove the sealing material. A substance capturing substance can also be provided.

[0018]

The present invention will be described in more detail below. FIG. 1 is a conceptual diagram of a construction target area according to the present invention, and is an example in which a surrounding wall around a dump site of a waste 1 is constructed as a blocking wall 2. Around such contaminated or potentially contaminated areas, a blocking wall 2 that prevents the transfer of contaminants from that area to the perimeter is preferably provided with an impermeable layer 3 below. It is constructed by reaching the water-impermeable layer 3. When there is no water-impermeable layer 3 or there is a risk of infiltration by groundwater flowing downward, a bottom wall similar to a blocking wall can be constructed below the contaminated area by an appropriate means. Preferably, the bottom wall is continuous with the blocking wall 2. If necessary, a blocking wall 2
Alternatively, liquid-impermeable sheets 5A and 5B can be provided inside the bottom wall.

Now, the first case in which the above-mentioned blocking wall 2 is constructed
Are shown in FIGS. 2 to 8. That is, first, as shown in FIG. 2, a guide wall 10 is constructed, and a long excavation groove 11 is excavated. In this excavation, when excavation is performed using a stabilizing liquid 12 such as bentonite, the hole wall is stabilized. Next, as shown in FIG.
a, for example, the hollow tube 13 is cut into the hollow 1
Insert into 1. In this case, as shown in FIG. 8, the hollow pipes 13 are spaced apart from each other in the digging groove 11 because the capturing piles 4 are finally arranged side by side in the longitudinal direction of the digging groove 11. insert. In addition, when the spacers 14 are fixed around the hollow tube 13 for insertion, the centering is facilitated. The spacer 14 can be removed or buried later.

Thereafter, as shown in FIG. 4, a hollow space forming tube 15 with a bottom is inserted into the hollow tube 13. in this case,
The space forming pipe 15 may be inserted into the excavation groove 11 together with the hollow pipe 13. The space forming tube 15 is desirably bottomed so that the stabilizing liquid 12 does not enter from below. Instead of the space forming tube 15, a solid tube may be used.

When the insertion of the space forming tube 15 is completed,
As shown in FIG. 5, the solidifying material 16 is solidified by adding a hardening additive to the stabilizing liquid 12 and stirring to stabilize the material, or by replacing the stabilizing liquid 12 with, for example, cement.

After the fluidity of the solidifiable material 16 is lost or solidified, as shown in FIG.
, And the extracted space is defined as a filling space 17. Thereafter, as shown in FIG. 7, a contaminant trapping substance 18 is charged into the hollow tube 13 and filled therein.

In the above example, the hollow tube 13 and the space forming tube 15 can be a metal tube or a plastic tube such as vinyl chloride. In order to facilitate removal of the space forming tube 15, an oil-based release agent can be applied to the inner surface of the hollow tube 13 or the outer surface of the space forming tube 15 or both. Sand or the like may be poured between them.

In the present invention, as for the trapping substance, a substance which adsorbs or retains a contaminant, for example, activated carbon, zeolite, vermiculite, kaolin, sodium bentonite, silica, blast furnace slag, or a mixture of other clay minerals alone or in combination is used. Can be used in a state.
This type has ion exchange capacity and adsorption capacity, and can be used. In addition, one or more of the materials disclosed in the above publication can be used in combination. When the contaminant is ammoniacal nitrogen or the like, a trapping substance corresponding to these can be used. Waste disposal sites may have many types of pollutants. Therefore, the types of trapping substances used in the trapping piles 4, 4,... Can be made different. The capturing substance may be used as it is, but may be used in the form of pellets, which are aggregated or agglomerated as pellets. In addition, the surface of the capture substance can be coated with a material that dissolves over time upon contact with other capture substances, especially liquids.

FIG. 9 shows another embodiment, and FIG.
As shown in FIG. 1, a drilling groove 11 is excavated in advance, a plurality of through holes 20a are formed therein, and the through holes 20a are sealed with a sealing material 21 such as rubber or plastic. A hollow holding member sealed with 21, for example, a hollow holding tube 20 is buried, and the space between the hollow holding member and the excavation groove 11 is solidified by the solidifying material 16, and the solidifying material 16 has lost fluidity. At a later point in time, a sealing means melting means, for example, a gas torch 22, is lowered into the hollow holding tube 20, and a hot gas is blown onto the sealing material 21 at the location of the sealing material 21 to melt the sealing material 21. Let the through hole 20
Open a. After this is performed for all the through holes 20 a, the hollow holding tube 20 is filled with the trapping substance 18. In this case, the sealing material 21 can be mechanically broken by, for example, a drill.

Further, a bag body may be provided on the entire inner surface of the hollow holding tube 20, and this may be used as a sealing material for each of the through holes 20a.

On the other hand, when the holding tube 20 is made of a plastic tube such as vinyl chloride, it is not necessary to form a through hole in advance and seal it with a sealing material. after working to solidification of the solidified material, such as de <br/> drill by a holding tube 20 may be forced to form a hole.

FIGS. 10 to 12 show still another embodiment, in which the hollow holding tube 13 having a plurality of through-holes 13a is inserted at the same time or before the solidification of the solidifying material 16 is started. A flexible bag 30 made of rubber, plastic, or the like is inserted into the holding tube 13 and the bag 30 is filled with a gas such as air or a liquid such as water before the solidification of the solidifiable material 16 is started. The solidified material 16 is inflated in the hollow holding tube 13 to maintain its inflated state at least until the fluidity of the solidifiable material 16 is lost. It can be contracted and removed from the hollow holder.

FIG. 13 shows another embodiment of the present invention, which is different from the embodiment shown in FIG.
The trapping substance 18 is filled in a cassette holder 40 having a large number of holes, for example, a rectangular box, and the cassette 41 is placed in a hollow panel at least after the point at which the fluidity of the solidifying material is lost. Holder 1
3A can be charged. Further, the cassette 41 can be made detachable by providing a suspension ring 42 or the like. As shown in FIG. 14, a net palanquin can be used as the cassette holder 40A.

In this case, the eyes forming the through holes are required to be smaller than the capturing substance. In any case, when the hollow holding member has a cylindrical or rectangular tube shape, the cassette can also correspond to the cross-sectional shape. Further, when the holding member is a hollow tubular member, as shown in FIG.
The cylindrical cassette 41A can be used, and one long holding tube or a plurality of short holding tubes can be continuously inserted into one hollow holding tube.

[0031] When using such a cassette 41 or 41A, trapping capacity of the capture material is convenient to exchange the time when decreased or lost. When a cassette is not used, the trapped substance in the hollow holder can be scraped out by an appropriate means and replaced.

As shown in FIG. 16, the hollow holding tube 13 and the digging groove 11
In this case, in order to increase the sedimentation property against the buoyancy of the solidifiable material 16 or the buoyancy of the stabilizing liquid, a sink rod 51 or the like is used as a weight. Can be.

[0033]

As described above, according to the present invention, it is possible to surely prevent the pollutant from flowing out of the contaminated area, and to bring advantages such as high reliability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a state where a blocking wall is constructed according to the present invention.

FIG. 2 is a schematic sectional view of a first step of a construction example of a first example of the present invention.

FIG. 3 is a schematic cross-sectional view of a second step of the construction example of the first example of the present invention.

FIG. 4 is a schematic cross-sectional view of a third step of the construction example of the first example of the present invention.

FIG. 5 is a schematic sectional view of a fourth step of the construction example of the first example of the present invention.

FIG. 6 is a schematic sectional view of a fifth step of the construction example of the first example of the present invention.

FIG. 7 is a schematic sectional view of a sixth step of the construction example of the first example of the present invention.

FIG. 8 is a horizontal cross-sectional view of a blocking wall showing a construction completion state according to the first example of the present invention.

FIG. 9 is a sectional view of another example of the present invention.

FIG. 10 is a schematic sectional view showing an example of a construction process according to another example of the present invention.

FIG. 11 is a schematic cross-sectional view showing a next step of a construction process according to another example of the present invention.

FIG. 12 is a schematic cross-sectional view showing a further next step in the construction process of another example of the present invention.

FIG. 13 is a perspective view showing a state where a cassette according to the present invention is inserted.

FIG. 14 is a perspective view showing an example of another cassette according to the present invention.

FIG. 15 is a perspective view showing an inserted state of another cassette according to the present invention.

FIG. 16 is a cross-sectional view of an installation example of a barrier film according to the present invention.

[Explanation of symbols] 1 ... waste, 2 ... barrier, 3 ... impermeable layer, 4 ... supplementary pile,
5A, 5B: liquid-impermeable sheet, 11: excavation groove, 12: stable liquid, 13: hollow holder, 13a: through hole, 14: spacer, 15: space forming tube, 16: solidifying material, 17: space , 18: supplementary substance, 20: hollow holding tube, 21: sealing material, 22: gas torch, 30: bag body, 41, 41A: cassette, 50: blocking film.

──────────────────────────────────────────────────の Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B09B 1/00 E02D 5/00-5/20 E02D 19/00-19/22 E02D 29/00-29 / 02

Claims (5)

(57) [Claims] Claims: 1. An area that is contaminated or at risk of contamination
In the surroundings, block the transfer of contaminants from the area to the surroundings
In the construction method of constructing a cut-off wall , there are multiple through-holes communicating inside and outside in a pre-drilled trench.
Embed the hollow holding body and
Simultaneous or subsequent solidification of the solidifiable material during body insertion
Before starting, insert a flexible bag into the hollow holding
Before the solidification of the material starts, inflate the bag in the hollow
At least until the solidified material loses its fluidity.
And then shrink the bag to release it from the hollow holder.
Removed, and the trapped substance of the contaminants in the removed space
An environmental conservation method characterized by providing quality. 2. The method according to claim 1 , wherein said area is contaminated or at risk of contamination.
In the surroundings, block the transfer of contaminants from the area to the surroundings
In the construction method of constructing a blocking wall, a hollow holder having no through-hole is inserted into a pre-drilled excavation groove.
Buried and solidified material between the hollow holder and the excavation trench
Solidify, then drill holes in the wall from inside the hollow support
Punched multiple holes, hollow holder with multiple through holes communicating inside and outside
Burying the holding body and trapped pollutants inside
An environmental conservation method characterized by providing quality. 3. The method of claim 1, wherein the area is contaminated or at risk of contamination.
In the surroundings, block the transfer of contaminants from the area to the surroundings
In the method of constructing a blocking wall that has a plurality of through holes in a pre-drilled trench,
The hollow holding body whose through-hole is sealed by the sealing material is embedded,
Solidification by solidifying material between empty holder and excavation trench
Then break the sealing material from inside the hollow support or
And remove the contaminant trapping substance into the hollow holder.
An environmental protection method characterized by being provided. 4. A trapping substance whose trapping ability has been reduced or lost.
The ring according to any one of claims 1 to 3, wherein
Environmental protection construction method. 5. A large number of through holes having a size that does not allow a trapping substance to pass through.
Fill a cassette holder with
When the set has lost at least the flowability of the solidifiable material
After the point, charging into the hollow holding body.
The environmental protection method according to claim 4.