JP2001070907A - Impervious structure in waste disposal site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restore a broken position to its original condition and to control seepage of water before seeping water flows outside by exerting own restoring function at the same time as being broken in the case where an impervious mechanism being laid on a waste disposal site is broken and to immediately restore the same region when it is broken again. SOLUTION: This impervious structure in a waste disposal site comprises a bottom part cut off layer 10 laid on a base ground 2 on which a waste disposal site is constructed, a top part cut off layer 11 facing this bottom part cut off layer 10 and forming an intermediate layer 12 between it and the bottom part cut off layer 10, a composite impervious body 4 consisting of a liq. restoring material fed and filled into the intermediate layer 12 under a more superpressurized condition than seeping water and a restoring corresponding layer 3 being laid on the outside of the composite impervious body 4. It is possible thereby that when breakage of the impervious layer is generated, the fed and filled restoring material flows out from the broken position under superpressure and the broken part can be self-restored while it is in cooperation with the restoring corresponding layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water impervious structure at a waste disposal site, and more particularly to a method for repairing a damaged part by a self-operation without a repair work from the outside when a water impervious layer is damaged. On the impermeable structure of a possible waste disposal site.

[0002]

2. Description of the Related Art In a landfill site for landfilling industrial waste and general waste, a water-blocking work must be installed on the bottom of the landfill to prevent environmental pollution due to sewage leaking from the landfill penetrating underground. It is mandatory to do so. For such water-blocking work, a method of laying a soft synthetic resin-based or rubber-based water-blocking sheet is adopted.However, a waste disposal site with a large area must be covered with one sheet of water-blocking sheet at a time. Because of the difficulty in construction, there has been adopted a method of laying a plurality of divided parts by welding or bonding their ends with an adhesive. However, in the method of joining the divided impermeable sheets at the site, there is a risk that sewage will leak out from the defective portion due to poor joining.

[0003] A water-blocking sheet in which a swelling clay layer such as bentonite or a water-absorbent resin is sealed in the space between two flexible sheets is also used. The problem that the impermeable sheet was damaged after the landfill was completed and the sewage leaked out had not been avoided. The causes of damage to the impermeable sheet are widespread, including physical and chemical damage and biological damage, and it is difficult to completely prevent it. Effective measures have not yet been established. For this reason, a technique for detecting and repairing the breakage of the sheet has been developed, and various detection methods have been proposed, and the technique has been put to practical use as an effective technique in terms of accuracy.

[0004] However, sheet repair techniques involve indirect repair of injecting a chemical solution around the damaged portion and directly repairing the damaged portion by excavating waste. Even if it is detected, the restoration is completed after the contaminated water has flowed out, and the environmental pollution generated during the restoration cannot be prevented.

[0005] Further, regarding the repair of a sheet having a space portion, since the leaked portion is repaired by grouting cement or the like, all of the injected space portion is solidified. If a leak occurred in the area, the detection mechanism would not operate.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. In the case where the water-impervious sheet is damaged, the water-impervious sheet exhibits its own repair function simultaneously with the damage. Therefore, a water-blocking structure at a waste disposal site that can block water at the damaged part before leachate from waste flows out to the outside and can immediately repair the same section even if it is damaged again. providing.

[0007]

According to a first aspect of the present invention, there is provided a water impervious structure for a waste disposal site, which prevents leakage of leachate from waste. The structure has a lower impermeable layer laid on the foundation ground on which the waste disposal site is constructed, and an upper impermeable surface facing the lower impermeable layer and forming an intermediate layer between the lower impermeable layer and the lower impermeable layer. Layer and a composite layer made of a liquid restoration material that is supplied and filled in the intermediate layer in an overpressure than the leachate, and a repair layer laid outside the composite layer. In the event of occurrence of a failure, the liquid restoration material filled with overpressure flows out of the damaged part and repairs the damaged part by itself in cooperation with the repairable layer.

According to a second aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to the first aspect, wherein a surface layer of the foundation ground is adapted to repair a lower water impervious layer. It is characterized by being a layer, and in addition to the above-mentioned functions, it aims at improving the water blocking and self-healing performance of the lower water blocking layer.

According to a third aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to the first or second aspect, wherein the lower water-impervious layer is a clay layer or a clay layer. The feature is that it is a mixed soil layer, and in addition to the above functions, the cost of the impermeable layer is reduced.

According to a fourth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to the first or second aspect, wherein each of the upper and lower water impervious layers is a sheet. In addition to the above functions, the water-impermeable performance is improved.

According to a fifth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to the first or second aspect, wherein the upper and lower water impervious layers are restored. It is characterized by being a restoration material infiltration film formed on the corresponding layer, and in addition to the above functions, the number of used members is reduced, thereby significantly reducing the construction cost.

According to a sixth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to fifth aspects, wherein the repairable layer is a nonwoven fabric. In addition to the above functions, construction costs are reduced and the construction period is shortened.

According to a seventh aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to sixth aspects. The feature is that the layer and the intermediate layer are divided into a plurality of sections in the plane direction, and the efficiency of the repair function is improved in addition to the above functions.

According to an eighth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to seventh aspects, wherein the shape retaining member is provided on the intermediate layer. In addition to the above-mentioned functions, a space for filling the liquid restorative material is secured, and the stress applied to the impermeable layer is reduced to prevent the breakage.

According to a ninth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to eighth aspects, wherein a colloid solution is used as a liquid restoration material. It is characterized by adoption, and in addition to the above functions, promotes poor water permeability and mud film formation in the repairable layer.

According to a tenth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to ninth aspects, wherein the swelling clay is used as a liquid restoration material. The feature is that a mineral solution is adopted, and in addition to the above functions, it promotes poor permeability and mud film formation in the restoration-compatible layer.

[0017] According to an eleventh aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to tenth aspects, wherein a magnetic fluid is applied to the liquid restoration material. It is characterized by being mixed, and in addition to the above functions, the filling, supply and quality control of the liquid restoration material are made efficient.

According to a twelfth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to eleventh aspects, wherein: Is controlled by the water level difference between the supply head of liquid restoration material and the head of leachate from waste,
In addition to the above functions, the balance of pressure with the leachate prevents damage to the impermeable layer and ensures repair in the event of damage.

According to a thirteenth aspect of the present invention, in the method for forming a water-impervious layer according to the fifth aspect, a shape-retaining member is laid on a repair-response layer formed on a surface layer of a foundation ground, and A repair corresponding layer is laid on top to form an intermediate layer having a water gap, a restraining load is applied to the repair corresponding layer on the shape maintaining member, and then the gap between the intermediate layers is supplied and filled with a liquid restoration material, It is characterized by forming a restoration material infiltration film on each of the above restoration corresponding layers, and reducing the construction cost by configuring the upper and lower water impervious layers with a restoration material infiltration film using liquid restoration material .

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The water impervious structure of a waste disposal site according to the present invention is basically used to prevent the leachate from waste from leaking out. The lower impermeable layer laid on top, the upper impermeable layer facing the lower impermeable layer and forming an intermediate layer between the lower impermeable layer, and the intermediate layer supplied with overpressure than leachate It is composed of a composite impervious body made of a liquid restoration material to be filled and a repair-response layer laid outside the composite impervious body. As a result, in the event of damage to the impermeable layer, the liquid restoration material filled with overpressure will flow out of the damaged area, and will work with the restoration response layer to create a physically and chemically impervious layer around the damaged area. And immediately repairs the damaged impermeable layer by itself. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view of a waste disposal facility in which a water disposal structure of a waste disposal site according to the present invention is applied to the waste disposal site. The waste disposal site 1 is formed by excavating a vast site in a mountain area or the like in a concave shape. The ground at the bottom of the disposal site is fixed and compacted to form a waterproof foundation ground 2, and while forming a slope with a predetermined slope, rubble and protrusions are removed and finished smoothly. On the foundation ground, a composite impermeable body 4 in which an intermediate layer formed between the upper and lower impermeable layers is supplied with a restoration material in a pressure higher than a leachate by overfilling, and laid to a predetermined height. Then, the repair-response layer 3 is laminated on the structure. The waste is then dumped and landfilled at the waste disposal site. The leachate 5 flowing out of the waste is prevented from flowing out to the outside by the composite water shield 4.

A colloid solution used as a liquid restoration material is supplied from the restoration material filling tower 6 to the composite water impervious body 4. The colloid solution is subjected to a head pressure and a leachate 5 depending on the height of the restoration material filling tower 6. Is filled in the composite water impervious body 4 in an overpressure state due to a water level difference from the head pressure.

The waste disposal site 1 is controlled by a control mechanism provided in a management building 8 including a colloid solution tank 7 storing a colloid solution, and is provided with contaminants such as leachate from waste. Is monitored to prevent it from leaking out of the waste disposal facility and developing into environmental pollution.

FIG. 2 shows the structure of the composite water shield 4 and the repairable layer 3.
FIG. The foundation ground 2 is provided with a predetermined waterproofing property by smooth finishing and compaction at the time of unevenness correction, but even if the composite water impervious body penetrates and breaks, it is necessary to ensure the water impermeability. The surface layer is leveled as the restoration corresponding layer 14. Next, the nonwoven fabric 9 for protecting the composite water shield is interposed therebetween, and then the composite water shield 4 is laid. The repair-response layer 14 receives the outflow of the colloid solution when the water-blocking sheet 10 is damaged as described later, and promotes the formation of the water-impermeable layer and the muddy film together with the nonwoven fabric 9. Water barrier sheet 1
It also plays a role in protecting 0. The composite impermeable body 4 is composed of a water impermeable sheet 10 constituting a lower impermeable layer and a water impermeable sheet 11 constituting an upper impermeable layer. Is formed in an overpressure state.

The water-blocking sheets 10 and 11 are made of, for example, a soft synthetic resin or rubber-based sheet material. However, it is difficult to cover a vast waste disposal site as a single sheet. For this reason, at the work site, the ends of unit sheets set to a predetermined size suitable for construction are overlapped with each other and joined by welding or crimping with an adhesive to cover the bottom surface of the waste disposal site. It is integrated into the size to obtain.

Further, in the present embodiment, as shown in the figure, the composite impermeable body 4 is formed by dividing each of the upper and lower impermeable layers and the intermediate layer into a plurality of sections by the boundary dividing member 18. At the same time, the problem of one sheet is solved, and at the same time, the function of repairing the damaged portion is made dense so that the damaged portion in the impermeable layer can be efficiently repaired. Although a colloid solution has been exemplified as the liquid restoring material, an emulsion in which polymer particles are stably dispersed in water may be employed as the liquid restoring material.

As a colloid solution, a swellable clay mineral solution is often used because it forms a poorly permeable layer in soil or the like and allows only water to flow out to form a mud film.
Examples of emulsions that can be used as the liquid restoration material include various emulsions in which polymer particles such as polyvinyl acetate, polymethyl methacrylate, polyethylene, and polybutadiene are stably dispersed in water.

Materials that can be used to form the above-mentioned swellable clay mineral solution, which is a colloidal solution, include bentonite, beidellite, nontronite, saponite, hectorite and holmite attapulgite, sepiolite, vermiculite, and illite. , Kaolinite, halloysite, gibbsite, hematite,
There are natural and synthetic products of clay minerals such as allophane, imogolite, mica clay mineral, synthetic bentonite, zeolite, talc, chlorite, calcite, and chlorite.

In the gap of the intermediate layer 12, a crushed stone 13 which is a shape retaining member is disposed in addition to the colloid solution, and receives a load such as buried waste and leachate while maintaining the shape of the intermediate layer 12. To the ground 2. This ensures a gap for supplying and filling the intermediate layer 12 with the liquid restoration material, stabilizing the overpressure state of the liquid restoration material, and ensuring that the impermeable sheet 11 of the upper impermeable layer takes on all of the above load. Since it can be avoided, the danger that the impermeable sheet 11 will be damaged by the load such as waste or leachate is avoided.

On the impermeable sheet 11 of the upper impermeable layer, locally generated soil is laid densely as the repairable layer 3.
The repair-response layer 3 promotes the formation of a poorly permeable layer and a mud film by receiving a colloid solution when the impermeable sheet 11 of the composite impermeable body 4 is broken, as described later. It also plays a role in protecting the water-impervious sheet 11 from waste that has been made. The material of the repairable layer 3 is not limited to the above-mentioned locally generated soil, but can be applied to other soils. In addition, as a repair-response layer for the water-impervious sheet 10 of the lower water-impervious layer, it is possible to use a foundation ground that is compacted smoothly. But,
In order to reliably repair the breakage of the water-impervious sheet 10 and secure more complete water-imperviousness, a repair-response layer 14 formed on the surface layer of the foundation ground 2 is laid down so as to respond more safely.

In this way, when the impermeable sheet 10 is damaged, the impervious layer and the mud film are reliably formed on the surface layer of the foundation ground 2 due to the outflow of the colloid solution, and the damaged impermeable sheet is repaired. You are sure. And the impermeable sheet 1
At the time of failure, the nonwoven fabric 9 laid between the foundation ground 2 and the lower impermeable layer 10 also acts in the same manner as the foundation ground by the adsorption of colloid particles, so that a non-permeable layer is formed on the surface of the foundation ground. And contributes to the formation of muddy film.

The composite water shield 4 and the repairable layer 3 constituting the water shield structure are configured as described above. Under normal conditions, the colloid solution filled in the voids of the intermediate layer 12 is , The overpressure state set in comparison with the head pressure of the leachate 5 from the waste is maintained. Therefore,
The waste and its leachate are closed by the impermeable layer under a predetermined pressure state and under a pressure balance with the liquid restoration material filled in the intermediate layer, without causing the composite impermeable body 4 to be damaged. Therefore, the contaminants are stored so that they do not flow out of the waste disposal site and cause environmental destruction.

Another embodiment of the composite impermeable body shown in FIG.
A clay layer or a clay mixed soil layer is adopted as the lower impermeable layer. The composite impermeable body 15 has a lower impermeable layer formed by laying a clay layer or a clay mixed soil layer 16 on the foundation ground 2. The clay layer or the clay-mixed soil layer has a certain level of water-blocking performance by itself, but furthermore, the colloid particles in the colloid solution form a clay layer or a clay-mixed soil layer by contact with a liquid restoration material. It is attracted to the surface of the soil particles by the negative charge of the soil particles. The water in the solution gradually penetrates into the clay layer or clay-mixed soil layer and the depth of the foundation ground, but the clay layer or clay-mixed soil layer functions as a filter and the soil particles continue to increase, closing the gap A mud film is formed upon reaching the state. This mud film will continue to grow until the pressure balance is reached, forming a stronger lower impermeable layer.

As described above, the composite impermeable body 15 employs the clay layer or the clay mixed soil layer 16 as the lower impermeable layer,
The clay layer or clay-mixed soil layer 16 and the impermeable sheet 11 face each other, and the intermediate layer 17 is filled with a colloid solution by overpressure.
Is formed. Therefore, corresponding to the impermeable sheet 11,
It is possible to omit the impermeable sheet which is difficult to handle, and it is possible to reduce the construction cost and the construction period. The other configuration of the composite water shield 15 is the same as that of the above-described embodiment, and a description thereof will be omitted. However, in the case where the composite water shield is divided into a plurality of pieces, the boundary partitioning member 18 is made of a clay layer or It is necessary to bury it in the clay mixed soil layer 16.

In the embodiment of the composite impervious body shown in FIG. 2, an example in which sheets are used as the upper and lower impervious layers has been described. However, the impermeable layer is not limited to this.
As shown in (1), the impermeable layer can be formed by a construction method in which the impermeable layer is not used as a separate material. FIG. 4 shows a water-blocking layer composed of a water-blocking film formed by a liquid restoration material. The formation of the impermeable structure 20 in the present embodiment
Since the construction is performed based on the following method of forming the water-impervious layer, the structure will be described together with the formation method sequentially described. That is, in the present embodiment, first, the repair corresponding layer 2 is formed on the surface layer of the foundation ground 2 in order to form the lower and upper impermeable layers.
Form one. This restoration-response layer 21 is provided with a waterproof construction so that the surface layer is compacted by removing compacts and protrusions at the same time that the foundation ground 2 is unevenly grounded and compacted to prevent water from easily penetrating. Alternatively, it may be formed by laying a soil layer similar to the upper restoration-corresponding layer to be described later after the ground of the foundation ground is adjusted.

Next, a shape retaining member 22 is laid on the repairable layer 21 on the surface layer of the foundation ground, and the repairable layer 2 is placed thereon.
The outer layer of the impermeable structure 20 is constructed by laying the soil layer as the third compactly. Since the shape maintaining member 22 is formed of a member having many gaps, an intermediate layer 24 having good water permeability is formed between the upper and lower repair corresponding layers.

Further, a predetermined pressing force is applied to the repairable layer 23 so that the shape of the water-blocking structure 20 is not collapsed by the filling pressure of the colloid solution, and is constrained. Thereafter, the colloid solution 25 as a liquid restoration material is applied to the shape holding member 22.
And is sequentially filled. The supply of the colloid solution is continuously performed in a predetermined overpressure state 26 even when the intermediate layer 24 becomes full.

As described in detail in the process of repairing the damage of the impermeable layer, the colloid solution is mainly composed of a smectite-based clay mineral, and therefore forms a thin plate-like crystal having a particle size of several μm or less. It has the property of being ion-exchangeable and swelling with water. For this purpose, the ion exchange causes the colloid particles to be attracted to the soil particles by the negative charge of the soil particles,
It functions to close the gap between the soils that make up the restoration-response layer and reduce water permeability. In addition, the soil between the foundation soil and the restoration layer, which has reduced water infiltration, becomes a filter and only water is discharged to the outside, and the amount of soil particles adsorbed by colloidal particles increases. The repairable layer includes
The soil between the foundation ground and the restoration layer and the colloid solution gradually form an infiltrated sediment in the soil in the boundary area adjacent to the intermediate layer, forming a mud, and eventually the mud A water-stopping material is formed due to the formation of the repair material infiltration film.

Accordingly, the lower and upper water-impervious layers 27 and 2 made of the above-mentioned restoration material infiltration film are provided below and above the intermediate layer.
7 ′ is formed to constitute the water shielding structure 20. For this reason, in the present embodiment, the liquid impermeable material used for normal operation of the waste disposal site is utilized, and a water impermeable structure in which the composite impermeable body and the repair corresponding layer are integrated can be configured. Eliminates the need to lay special members such as soft synthetic resin or rubber-based sheets on the upper and lower parts of the middle layer as the water layer, which can greatly reduce the construction cost and shorten the construction period in a vast waste disposal site. Will be.

In the embodiment shown in FIG. 2, the repair corresponding layer has been described as laying the locally generated soil. However, the present invention is not limited to this, and may be formed of a nonwoven fabric. FIG. 5 is a cross-sectional view illustrating an embodiment of the repair-response layer made of a nonwoven fabric. In the water impermeable structure according to the present embodiment, a nonwoven material of long fiber is used as the nonwoven fabric used for the repairable layer, and the nonwoven fabric 9 is laid on the foundation ground 2 as the repairable layer of the lower water impermeable layer 10. ,
A non-woven fabric 29 is laid as a repairing layer of the upper water-impervious layer 11 with the crushed aggregate 13 provided in the intermediate layer interposed therebetween to constitute a water-impervious structure 28.

For this reason, when any of the water-impervious layers is damaged, the colloidal particles are attracted to the negative charges of the long fibers forming the non-woven fabric by ion exchange as described later in detail, and the length is reduced. It functions to adsorb to the fibers and close the spaces existing between the long fibers of the nonwoven fabric to reduce water permeability. Furthermore, since the nonwoven fabric with reduced water permeability becomes a filter, only water is discharged to the outside and the long fibers adsorbed by the colloid particles increase, so that the nonwoven fabric gradually forms a permeation-sedimentation layer. The mud is formed and the damaged part is repaired. Therefore, in this embodiment, since the nonwoven fabric which is lightweight and easy to handle is used as the repair-response layer, the construction is easier than in the case of using soil or the like, and the construction efficiency is improved, so that the construction period is improved. Shortening can be achieved.

In each of the above embodiments, crushed stone is used as the shape holding member. However, as the shape holding member, other fillers such as bricks, blocks, block-shaped foamed plastic products, and the like may be used. It has water permeability like a filler made by molding a plastic material, plastic drain or aluminum plate, stainless steel plate, iron plate, etc. into a three-dimensional shape such as unevenness, corrugated plate, cylindrical shape, etc., and has the desired strength. It can be used arbitrarily as long as it can maintain the shape for the load and secure a sufficient space to supply and fill the restoration material, and can transmit the applied load. .

Next, a description will be given of a self-healing function in the impermeable structure of the waste disposal site according to the present invention. As described above, in the water impermeable structure according to the present invention, the intermediate layer of the composite water impermeable body is filled with a colloid solution as a liquid restorative material in an overpressure state, and the repair corresponding layer is laid in the upper water impermeable layer in a compact manner. ing. In the present embodiment, a colloid solution mainly containing a smectite clay mineral is used. For this reason, the colloid solution exhibits the following physical and chemical properties as a liquid restoration material. Since it has a particle size of several μm or less and is composed of a thin plate-shaped crystal, it has excellent fluidity in a minute space, and penetrates relatively easily into the repair-compatible layer and the soil in the foundation ground. The ion-exchangeable, negatively charged colloidal particles of the electric double layer are adsorbed on the repair-response layer and on the surface of the soil particles in the foundation ground to form a percolation sediment. Since it has a thin plate-like crystal structure and orientation, soil particles in the repairable layer and the foundation ground to which the colloidal particles are adsorbed act as a filter to discharge water in the solution to the outside. Moisture remaining in the soil particles gap repair corresponds layer and basic in the ground while discharging to the outside, permeability k ≦ 10- ⁸ m / s
A mud film (mud cake) of ec is formed.

FIG. 6 shows a water blocking process by self-repair of the water blocking layer at the time of breakage. As shown in FIG. 6 (a), when a broken portion 30 occurs in the impermeable sheet 11 of the upper impermeable layer for some reason, the colloid solution 31
However, since it is in an overpressure state with respect to the pressure of the leachate, it flows out from the damaged portion 30 and penetrates into the repairable layer 3 laid on the impermeable sheet in a compacted state. The outflow of the colloid solution 31 is detected as a pressure drop in the management building, and damage to the composite water shield is confirmed. Then, a command is issued from the control device, and the colloid solution 31 is continuously supplied from the colloid solution tank until the restoration is completed as shown in the figure.

The colloid solution 31 that has permeated the repairable layer 3
Exerts the above-mentioned “characteristics”, and as shown in FIG. 6B, adsorbs negatively charged colloidal particles to the soil particles or the long-fiber non-woven fabric of the repair-response layer 3 and causes the permeation and sedimentation
To form

When the formation of the osmotic sedimentation layer 32 starts in the repairable layer, the above-mentioned “characteristics” are exhibited,
The soil particles or the nonwoven fabric of the repair-response layer 3 to which the colloid particles are adsorbed serve as a filter to discharge water in the solution to the outside. A mud film (mud cake) 33 is formed in the gap between the soil particles of the layer or the non-woven fabric to constitute a new water-impervious layer.

As described above, the water-blocking structure of a waste disposal site according to the present invention fills the intermediate layer of the water-blocking layer by filling and filling the intermediate layer of the water-blocking layer with a pressure higher than the pressure of the leachate of the waste. When the water layer is damaged, the colloid solution is allowed to flow out of the damaged area to the repairable layer and penetrate into the soil or nonwoven fabric of the repairable layer, so that the physical and chemical properties of the colloidal solution can be effectively used. The damage is prevented at the same time as the impermeable layer is damaged, preventing the leachate from flowing out of the waste disposal site. Repair of the impermeable layer does not require repair work such as injection of solidified material, and only the damaged part is repaired. it can.

In general, it is desirable that the colloid solution and the swelling clay mineral solution used as the liquid restoration material are circulated periodically to avoid agglomeration of particles and circulated to prevent freezing in winter. For this reason, also in the present invention, circulation is performed by a circulation facility such as a pump managed by a control facility provided in the management building 8.

The liquid restoration material may change its characteristics due to the passage of time or various actions of the external environment, and its flow characteristics may be different. Further, since the composite impermeable body is inclined at an arbitrary gradient. The pressure distribution according to the water head acts on the head, and the pressure balance with the leachate may differ in a plane.
Therefore, the circulation of the liquid restorative material is based on ordinary daily management, in which the circulation is performed once a day for about one hour for the purpose of confirming the clogging state of the pipe. Since the normalization of the liquid restoration material needs to be achieved only by its circulation, the liquid restoration material is sampled and its physical properties are measured, and the correlation between the physical property values, the pressure loss, and the solution flow rate is obtained. By controlling the circulating pressure and the circulating method set from the above, the liquid restoration material whose physical properties have been changed is returned to normal.

Further, it is necessary to refill the liquid restorative material.
This refilling is necessary because the restoration material comes into contact with leachate when the composite impervious body breaks, causing changes in physical properties and flow characteristics. This is done to maintain performance. For this purpose, the refilling of the liquid restorative material controls the filling pressure and the circulation method set from the correlation between the physical property value, the pressure loss and the solution flow rate while collecting the liquid restorative material and measuring its physical properties. In this way, pressure control of filling and reflux of the liquid restoration material according to the scale of damage is performed.

The circulation of the liquid restorative material is performed as described above. Since both the colloid solution and the swelling clay mineral solution have ion exchange properties and each particle has a charge, the solution is immersed in the solution. The entire solution can be controlled by mixing a magnetic fluid and applying a magnetic field. That is, the magnetic fluid forms a homogeneous colloid solution by stably dispersing ultrafine ferromagnetic particles in a solvent such as water or kerosene via a surfactant.
Accordingly, the magnetic fluid can be set to a predetermined viscosity by mixing with a colloid solution as a liquid restoration material, and at the same time, it is possible to change the viscosity of the colloid solution by applying a magnetic field.・ Can be used effectively for filling and quality control.

The application of a magnetic field to the colloid solution can be easily made by installing a magnetic field generator on an arbitrary pipe or impermeable layer. Although the magnetic field generator is not particularly limited, it is necessary to apply or cancel the magnetic field, or to change the applied magnetic field strength. , N and S of the electromagnets
The electrodes are arranged at a predetermined grid point pitch with the poles facing each other.

The control of the colloid solution corresponds to the following. At the time of filling the colloid solution, the viscosity of the colloid solution is reduced by controlling the magnetic field intensity to be low, thereby improving the fluidity. Thereby, the filling effect of the colloid solution on the composite impermeable body is enhanced. When the colloid solution is supplied to self-repair the damage of the composite impermeable body, the viscosity of the colloid solution is increased by controlling the magnetic field strength to be high, and the fluidity is reduced.
As a result, the colloid particles are concentrated on the damaged portion of the composite impermeable body, thereby improving the repair effect. When the colloid solution is circulating, the direction of the magnetic field is changed so that the colloid particles do not separate and agglomerate. This promotes the normalization of the colloid solution.

As described above, by controlling the magnetic field to be applied by mixing the magnetic fluid into the colloidal solution, from the time of initial filling of the colloidal solution to the time of circulating for quality control, furthermore, the composite impermeable body Changing the fluidity of the colloid solution during supply of the colloid solution at the time of breakage greatly contributes to the supply management of the liquid restoration material.

Further, the liquid restorative material is filled in the intermediate layer of the impermeable layer, and the filling state is maintained in an overpressure state more than the leachate from waste. Since this overpressure affects the repair function when the impermeable layer is broken as described above, it must be accurately maintained. For this reason, in the impermeable structure of the waste disposal site according to the present invention, the water level is compared by comparing the overpressure state of the liquid restoration material with the head pressure of the leachate from the waste buried in the waste disposal site. The difference is set and controlled.

Therefore, the over-pressure state of the liquid restoration material can be controlled by a pump facility from the management building.
The storage and supply position of the liquid restoration material is set higher than the leachate position, and from the viewpoint of maintenance-free, automatic operation is performed based on the water level difference between the liquid restoration material supply head and the leachate water from the waste. To be controlled
The operating costs required for each facility are reduced.

As described above, the present invention has been described in detail based on the embodiments. However, the impermeable structure of the waste disposal site according to the present invention basically prevents leakage of leachate from waste. A water-impervious structure of a waste disposal site, where a lower water-impervious layer is laid on the foundation ground on which the waste disposal site is constructed,
A composite shield consisting of an upper impermeable layer facing the lower impermeable layer and forming an intermediate layer between the lower impermeable layer, and a liquid restoration material that is supplied and filled in the intermediate layer in an overpressure state than the leachate. The present invention is not limited to the above-described embodiment at all, and is constituted by a restoration body layer laid outside the water body and the composite impermeable body, without departing from the spirit of the invention. Of course is possible.

[0058]

According to the first aspect of the present invention, there is provided a water disposal structure for a waste disposal site, which prevents leakage of leachate from waste. , A lower impermeable layer laid on the foundation ground to construct a waste disposal site,
A composite shield consisting of an upper impermeable layer facing the lower impermeable layer and forming an intermediate layer between the lower impermeable layer, and a liquid restoration material that is supplied and filled in the intermediate layer in an overpressure state than the leachate. As the liquid restoration material cooperates with the restoration response layer and repairs the damaged part at the same time as the damage itself, it is composed of a restoration layer laid outside the water body and the composite impermeable body. This has the effect of preventing runoff and avoiding the occurrence of environmental problems.

According to a second aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to the first aspect, wherein the surface layer of the foundation ground is adapted to repair a lower water impervious layer. Since it is a layer, it has the effect of improving the water blocking and restoration performance in addition to the above effects.

According to a third aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to the first or second aspect, wherein the lower water-impervious layer is made of a clay layer or clay. Since it is characterized by being a mixed soil layer, it has the effect of reducing the cost of the impermeable layer in addition to the above functions.

According to a fourth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to the first or second aspect, wherein the upper and lower water impervious layers are sheets. Because of this feature, in addition to the above-described effects, an effect of improving the water blocking performance is achieved.

According to a fifth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to the first or second aspect, wherein the upper and lower water impervious layers are restored. Since it is characterized by the restoration material infiltration film formed on the corresponding layer, in addition to the above-mentioned effects, there is an effect of greatly reducing the construction cost by reducing the number of used members.

According to a sixth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to fifth aspects, wherein the repairable layer is a nonwoven fabric. Because of this feature, in addition to the above-described effects, there is an effect of reducing the construction cost and shortening the construction period.

According to a seventh aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to sixth aspects, wherein each of the upper and lower water impervious structures is provided. The feature is that the layer and the intermediate layer are divided into a plurality of sections in the plane direction, so that in addition to the above effects, the effect of improving the efficiency of the repair function is achieved.

According to an eighth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to seventh aspects, wherein the shape retaining member is provided on the intermediate layer. Since the arrangement is characterized in that it is arranged, in addition to the above-mentioned effects, it has the effect of securing a space for filling the liquid restorative material, reducing the stress applied to the impermeable layer, and preventing its breakage.

According to a ninth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to eighth aspects, wherein a colloid solution is used as a liquid restoration material. Since it is characterized by adoption, in addition to the above-mentioned effects, it has an effect of promoting poor water permeability and mud film formation in the restoration-compatible layer.

According to a tenth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to ninth aspects, wherein the swelling clay is used as a liquid restoration material. It is characterized by the use of mineral solutions,
In addition to the above effects, the present invention has the effect of promoting poor water permeability and mud film formation in the restoration-compatible layer.

According to the eleventh aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to tenth aspects, wherein the magnetic fluid is applied to the liquid restoration material. Since it is characterized by being mixed, in addition to the above-mentioned effects, there is an effect that the filling, supply, and quality control of the liquid restoration material are made more efficient.

According to a twelfth aspect of the present invention, there is provided a water disposal structure for a waste disposal site according to any one of the first to eleventh aspects, wherein: Is controlled by the water level difference between the supply head of liquid restoration material and the head of leachate from waste, so that in addition to the above-mentioned effects, prevention of breakage of the impermeable layer by pressure balance with leachate It has the effect of ensuring the repair in the event of damage.

According to a thirteenth aspect of the present invention, in the method for forming a water-impervious layer, a shape-retaining member is laid on a repair-response layer formed on a surface layer of a foundation ground, and An intermediate layer having a water gap is formed by laying a restoration layer thereon, and a restraining load is applied to the restoration layer on the shape maintaining member. Since the restoration material infiltration film is formed on each of the above restoration corresponding layers, the effect of reducing the construction cost by forming the upper and lower water impervious layers with the restoration material infiltration film using the liquid restoration material Is playing.

[Brief description of the drawings]

FIG. 1 is an overall view of a waste disposal site to which the present invention is applied.

FIG. 2 is a partial cross-sectional view showing a water impermeable structure of a waste disposal site according to the present invention.

FIG. 3 is a partial cross-sectional view showing a water impermeable layer in which a water impermeable layer and a lower water impermeable layer of FIG. 2 are different.

FIG. 4 is a partial cross-sectional view showing a water impervious layer made of a restoration material infiltration film without a water impervious sheet.

FIG. 5 is a partial cross-sectional view of a water-impervious structure in which the repair-response layer is a nonwoven fabric.

FIG. 6 is a process diagram showing breakage and self-repair of the impermeable layer.

[Explanation of symbols]

1 waste disposal site, 2 foundation ground, 3 rehabilitation layer, 4 composite impermeable body, 5 leachate, 6 liquid restoration material packed tower, 7 colloid solution tank, 8 administration building, 9
Nonwoven fabric, 10, 11 water-blocking sheet, 12 intermediate layer, 13 crushed stone, 15 water-blocking layer, 16 clay layer or clay-mixed soil layer, 17 intermediate layer, 18 boundary material,
Reference Signs List 20 water-blocking structure, 21, 23 restoration-compatible layer, 22 shape-retaining member, 24 intermediate layer, 25 colloid solution,
26 overpressure, 27 lower impermeable layer composed of restoration material infiltration film, 27 ′ upper impermeable layer composed of restoration material infiltration film, 28
Water-blocking structure, 29 Non-woven fabric, 30 Damaged part, 31
Colloid solution, 32 osmosis deposition, 33 mud,

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 592158969 Seibu Construction Co., Ltd. 1-16-1 Minami Ikebukuro, Toshima-ku, Tokyo (71) Applicant 000166432 Toda Construction Co., Ltd. 1-7-1 Kyobashi, Chuo-ku, Tokyo (71) Applicant 591054233 Toyojun Yoko Co., Ltd. 1-9-1, Edobori, Nishi-ku, Osaka-shi, Osaka (72) Inventor Takao Hongo 4-2-2, Nobori, Nishi-ku, Osaka-shi, Osaka Inside the Osaka Soil Testing Laboratory ( 72) Inventor Takafumi Ichikawa 3-24-1, Otsuka-cho, Takatsuki-shi, Osaka Prefecture Inside Asanumagumi Technical Research Institute Co., Ltd. (72) Inventor Mitsuo Kawaguchi 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi, Osaka (Okumura Gumi Co., Ltd. 72) Inventor Yoshikazu Otsuka 2-2-2 Matsuzakicho, Abeno-ku, Osaka City, Osaka Prefecture Inside Okumura Gumi Co., Ltd. (72) Inventor Kokei Takemoto Osaka City, Osaka Prefecture 2-2-2 Matsuzaki-cho, Abeno-ku Okumura Gumi Co., Ltd. (72) Inventor Seiichi Narushima 1-11-2 Kusunokidai, Tokorozawa-shi, Saitama Seibu Construction Co., Ltd. (72) Fumitoshi Sato 1 Kyobashi, Chuo-ku, Tokyo No. 7-1 Toda Ken Construction Co., Ltd. (72) Inventor Takahiro Nakamura 1-7-1 Kyobashi, Chuo-ku, Tokyo Inside Toda Ken Construction Co., Ltd. (72) Katsumi Mizuno 1-chome Edobori, Nishi-ku, Osaka-shi, Osaka 9-1 No. F-term (reference) in Toyoko Junko Co., Ltd. 4D004 AA46 AB01 BB05 BB06 CC20

Claims (13)

[Claims] Claims: 1. A water impervious structure of a waste disposal site for preventing leachate from waste from leaking, wherein a lower impermeable layer is laid on a foundation ground for constructing the waste disposal site. An upper impermeable layer facing the lower impermeable layer and forming an intermediate layer between the lower impermeable layer and a liquid restorative material supplied and filled in the intermediate layer in an overpressure state than the leachate. A water impermeable structure for a waste disposal site, comprising a composite impermeable body and a repairable layer laid outside the composite impermeable body. 2. The impermeable structure of a waste disposal site according to claim 1, wherein a surface layer of the foundation ground is a layer for repairing a lower impermeable layer. 3. The impermeable structure of a waste disposal site according to claim 1, wherein the lower impermeable layer is a clay layer or a clay-mixed soil layer. 4. The impermeable structure of a waste disposal site according to claim 1, wherein each of the upper and lower impermeable layers is a sheet. 5. The method according to claim 1, wherein each of the upper and lower impermeable layers is a restoration material infiltration film formed on the restoration corresponding layer.
Or the impermeable structure of the waste disposal site according to 2. 6. The impermeable structure of a waste disposal site according to claim 1, wherein the repairable layer is a nonwoven fabric. 7. The shielding of a waste disposal site according to claim 1, wherein each of the upper and lower impermeable layers and the intermediate layer is divided into a plurality of sections in a plane direction. Water structure. 8. The impermeable structure of a waste disposal site according to claim 1, wherein a shape maintaining member is provided on the intermediate layer. 9. The impermeable structure of a waste disposal site according to claim 1, wherein the liquid restoration material is a colloid solution. 10. The impermeable structure of a waste disposal site according to claim 1, wherein the liquid restoration material is a swellable clay mineral solution. 11. The impermeable structure of a waste disposal site according to claim 1, wherein a magnetic fluid is mixed into the liquid restoration material. 12. The liquid restoration material according to claim 1, wherein the overpressure state of the liquid restoration material is controlled by a water level difference between a supply head of the liquid restoration material and a head of leachate from waste. The impermeable structure of the waste disposal site described. 13. A restoration layer is laid on a restoration layer formed on a surface layer of the foundation ground, and an restoration layer is laid on the restoration layer to form an intermediate layer having a water gap.
Applying a restraining load to the repair-corresponding layer on the shape maintaining member, and thereafter supplying and filling the gap between the intermediate layers with the liquid repair material, thereby forming a repair-material infiltration film on each of the repair-corresponding layers. A method for forming a water barrier layer according to claim 5.