JPH05305274A - Industrial waste pit - Google Patents

Abstract

PURPOSE:To ensure that the subject pit can withstand the impact of an earthquake or the pressure of an earth for a long time using a limited amount of expense and also a harmful substance sealed in the pit can be prevented from leaking by applying an elastic material case formed and coated using a resin coating material, to the inner surface of a dumping tank. CONSTITUTION:An elastic material case 40 formed and coated using a resin coating material 36 is applied to the inner surface of a dumping tank 34 in a shielding-type concrete pit 33 stored in the dumping tank 34 for harmful industrial waste. This elastic material case 40 is composed of elastic rubber 41 sandwiched between two FRP panels 42 with the external surface of the elastic rubber 41 coated with the FRP panel 42. The elastic material case 40 thus formed withstands the impact of an earthquake or the pressure of an earth for a long time and prevents a harmful industrial waste sealed in the pit 33 from leaking. Consequently, the shielding-type concrete pit 33 can be realized within a realistic cost limitation framework.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier concrete pit for enclosing highly hazardous waste, and more particularly to a technique for more reliably preventing leakage of harmful substances after encapsulation and burying.

[0002]

2. Description of the Related Art Increasing industrial waste has been of particular interest in recent years with regard to the safety of its final disposal site. The amount of industrial waste emitted in the process of seed business activities is extremely large, and it is difficult to completely remove harmful substances even by various intermediate treatments (detoxification treatments). Long-term safety after dumping into the ship becomes a problem.

A point to be considered in the safety of the final disposal site is leakage and leakage of harmful substances into the landfill soil. Therefore, regarding the final disposal of industrial waste, the national and local governments have established detailed standards for ensuring safety. Figure 8 here
Is a disposal site that uses a so-called interception-type concrete pit, in which a fence 2 is provided around the disposal site 1 and a standing tag 3 indicating necessary display items is provided to fill up the waste 4. The pit 5 is provided with an internal partition 6, and the blocking pit 5 filled with waste is covered with a concrete lid 7 to seal the pit 5, while the pit 5 being dumped is provided with a roof 8 to prevent rainwater.

In the disposal site using the shut-off pit 5 as described above, mainly waste liquid sludge, which is highly harmful, and incinerated ash such as plastic are reclaimed. These are the ones that have undergone intermediate treatment for detoxification, but there are technical difficulties for disposal, such as mercury and cadmium added as stabilizers and colorants in trace amounts in plastic incineration ash. Many are accompanied. And, as for the use of such shut-off pits, conventionally, there is no one that exceeds the administrative guidance standard. In other words, the conventional technique is only to increase the concrete thickness of the pit or to dispose a waterproof sheet on the inner wall surface of the pit (for example, Japanese Patent Laid-Open No. 59-13618).
3) Guaranteeing more reliable and permanent safety in consideration of the possibility of leakage of waste substances in the unlikely event of a strong shock such as an earthquake, and long-term chemical changes of harmful substances in 100-year units. It is considered that there is still room for improvement in the technology to be implemented despite the above-mentioned guidance standards.

On the other hand, regarding the final disposal of radioactive waste that is treated differently from general industrial waste, for example, as shown in FIG. 9, the solidified radioactive waste is stored in a processing container 21, The processing container 21 is stored in a concrete pit 20 formed by casting in a bare trench.
It is a general method that the mortar 22 is filled in the pit 20, a concrete lid body 23 is placed from above, and the lid body 23 is fixed with an adhesive 24. In this case, the mortar 22 filled inside the pit 20 prevents the radioactive nuclides from leaking to the outside, and also prevents the processing container 21 from moving to prevent a fall accident (Actual No. 62-135999; FIG. 2).

FIG. 10 shows another example of such a radioactive waste pit, in which a cushion material 26 and a waterproof sheet 27 are provided on the inner wall surface of the pit 25, and a steel plate 28 is wound around the partition wall of the pit 25. Steel plate 28 at appropriate location J
In JP-A-2-253197.
Here, the steel plate 28 is a reinforcing member for preventing deformation of the pit 25 due to earth pressure.

[0007]

By the way, at present, the final disposal of general industrial waste is subject to strong economic constraints, such as the work cost such as the winding of a steel plate as disclosed in JP-A-2-253197. The extremely expensive means cannot be used in reality. In the case of radioactive waste, it is possible to construct a pit that ignores the cost constraint, but as for industrial waste, the principle is to bear the burden on the company, so the pit configuration for final treatment also has a cost constraint. I have to take it.

[0008] From a technical point of view, in the treatment of radioactive waste in which mortar is filled in the pit, a cushion material or a waterproof sheet may be stretched on the inner wall surface of the pit, but drain sludge or incineration is possible. In the case of a cut-off pit that discards ash, it is meaningless to dispose a cushion material on the inner wall of the pit because there is no solid body to absorb vibration.

On the other hand, when a waterproof sheet is applied to the inner wall of the pit, solid matter may be mixed in the waste sludge or incineration ash at any stage of recovery-intermediate treatment-final treatment, It is highly possible that the waterproof sheet will be damaged and the waterproof function will be impaired.

As a result of such circumstances, the conventional barrier concrete pit has a technical structure in which the wall thickness of the concrete defining the pit is increased at most, or a waterproof sheet is applied to the inner wall of the pit on the assumption that solid matter is not mixed. Stayed at.

However, now that the problems such as environmental pollution and environmental destruction have permeated as general public awareness, concrete pits that can more efficiently finalize hazardous substances and guarantee the safety afterwards, within a certain cost constraint. Is required.

[0012] Therefore, an object of the present invention is to provide a barrier type concrete pit which can endure a shock such as an earthquake or earth pressure for a very long period of time and prevent leakage of harmful substances enclosed in the pit. It is a point that can be realized.

[0013]

[Means for Solving the Problems] In order to achieve the above object and achieve the object, the industrial waste pit according to the present invention has a technical premise of a barrier concrete pit for enclosing highly hazardous waste in a dump tank. An elastic material case formed by coating with a resin-based coating material is arranged on the inner surface of the dump tank.

[0014]

In the pit according to the present invention, since the elastic material case formed by coating with the resin-based coating material is arranged on the inner surface of the dump tank, a strong impact is applied to the ground around the pit and cracks occur in the partition concrete. However, the resin-coated elastic material case completely blocks the leakage of harmful substances inside. Unlike the case where a waterproof sheet is applied to the inner wall of the pit, the elastic material case is protected by the resin coating material, so even if there is a mistake in management at the time of disposal such as dumping solid materials such as dry batteries, it will crack. No accidents such as damage will occur.

Further, unlike the steel plate used for the radioactive waste pit, the resin elastic material case is light in weight and easy to handle, so that the working cost can be suppressed.
Further, it is possible to integrally dispose the resin-based film material without a seam such as welding at the connection portion of the steel sheet as seen in JP-A-2-253197, and it is possible to completely prevent leakage of harmful substances due to raindrops and the like. ..

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show an example of a processing pit according to the present invention, in which a crushed stone 30 is cut on a bottom floor surface of a landfill space excavated into a predetermined shape, and a waste concrete 31 is placed on the crushed stone 31.
To form a base, and the processing pit 33 is formed on the base. Reference numeral Q is a U-shaped side groove for discharging rainwater and the like.

The processing pit 33 is formed by assembling a formwork on a foundation and pouring concrete, and each disposal layer 34 is formed.
A resin-coated elastic material case 40 is disposed on the concrete wall portion, and an elastic resin film material such as a natural rubber sheet 3 is provided on the concrete wall.
Insert 6

The resin-coated elastic material case 40 includes the respective discard layers 34.
More specifically, for example, as shown in FIGS. 5 and 6, the elastic rubber 41 is sandwiched between two FRP panels 42, and the outer surface of the elastic rubber 41 is FR.
It is formed by being covered with a P panel 42.

Generally, the elastic rubber 41 is easily scratched by a hard substance, but the coating by the FRP panel 42 prevents scratches from occurring and is chemically stable for a long period of time.
That is, the elastic rubber 41 is stable against almost all the substances contained in the pit, and the FRP is resistant to strong impact.
The panel 42 exerts stress, and the resin-coated elastic material case 40 maintains the initial state physically and chemically for a long period of time. Further, since the resin-coated elastic material case 40 functions as a heat insulating material, the chemical stability of the substance housed inside is further ensured.

Next, the operation of this concrete pit will be described. The basic structure of the processing pit 33 is designed so that even if an earthquake impact of magnitude 10 is applied, the impact is not absorbed by the presence of the natural rubber sheet 36 and the concrete wall of each dump tank 34 is not cracked. ing. Then, even if a more unexpected impact is applied and a crack occurs in the concrete layer, the natural rubber sheet 3
The presence of 6 completely prevents the leakage of liquid. Even when a part of the natural rubber sheet 36 is cracked due to the tension of the concrete layer, the resin-coated elastic material case 4
0 completely prevents liquid leakage. This is because the FRP panel 42 exerts a stress equivalent to that of a metal with respect to tension and also has an excellent bending elastic stress by itself.

Thus, the resin-coated elastic material case 40 is
It is not always necessary to dispose the natural rubber sheet 36 in the concrete layer because it is resistant to impact and is chemically stable.
Even if the resin-coated elastic material case 40 is disposed inside the simple concrete layer similar to the conventional pit, substantially the same effect can be obtained. In that case, the construction cost of the processing pit can be significantly reduced.

The pit in which the resin-coated elastic material case is arranged is not necessarily limited to the final disposal pit. It is also an effective means for a waste liquid storage pit that temporarily stores various waste liquids that are difficult to dispose at the moment. FIG. 7 shows an example of such a waste liquid storage pit. In this storage pit 60, a resin-coated elastic material case 61 having an open upper side is arranged inside a dumping tank, and a natural rubber sheet 63 is arranged thereon to further form an upper concrete layer 64 to seal the pit. Then, valve openings 65v and 66v of a waste liquid injecting pipe 65 and a waste liquid extracting pipe 66 are provided in a part of the upper concrete layer 64.
The roof 67 is provided on 5v and 66v. Extraction pipe 66
Is arranged so that the lower end thereof reaches the bottom portion of the resin-coated elastic material case 62. Reference numeral 68 is a swing stop at the tip of the pipe. According to this structure, the pipes 65, which are arranged in advance,
By 66, the waste liquid can be easily injected and taken out.

In this storage pit 60, the resin-coated elastic material case 61 is arranged on the inner surface of the dumping tank, so that although the pits can be easily formed during concrete pouring, concrete erosion due to the waste liquid does not occur and long-term stability is ensured. Then, the waste liquid can be stored. The storage pit 60 is
The material of the pit is not necessarily limited to concrete because the pit is used for a purpose different from the concrete barrier pit based on the conventional administrative guidance.

If more severe strength conditions are required, iron plates, lead plates, stainless steel plates and other metal panels are arranged around the pits, or rigid panels such as FRP are arranged to reinforce the entire pits. You can go. A metal case such as stainless steel may be provided on the inner surface of the elastic material case 62 in relation to the waste liquid.

In the pit according to the present invention, the number of dump tanks 34 is not limited. A dump tank 34 depending on the topography and environment of the treatment plant
Can be increased or decreased as appropriate. In addition, the concrete thickness that defines the pit is 250 kg /
It is desirable to have a compressive strength of not less than cm ² and a wall thickness of not less than 15 cm. The shape, size and composition of the pits are also free.

The resin-based membrane material disposed inside the concrete layer exhibits good elasticity with respect to the set thickness of concrete,
Further, it is not limited to natural rubber as long as it can block moisture (or gas) accompanied by harmful substances. Further, in the above-mentioned embodiment, the FRP panel is used for coating the elastic material, but a means such as sticking or winding an FRP sheet or spraying an FRP mixed spray may be used.

[0027]

As described above, in the final disposal pit for industrial waste according to the present invention, the elastic material case coated and molded with the resin-based coating material is arranged on the inner surface of the disposal tank. Even if a strong impact is applied to the ground and cracks occur in the partition concrete, the elastic material case covered with the resin coating completely blocks the leakage of harmful substances inside. Further, since the resin-based covering material and the elastic material case are light in weight and easy to handle, the working cost can be suppressed. As a result, it is possible to realize a barrier concrete pit that can withstand impacts such as earthquakes and earth pressure for a very long time and prevent leakage of harmful substances enclosed in the pit within practical cost constraints.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an example of a processing pit according to the present invention.

FIG. 2 is a plan view showing an example of a processing pit according to the present invention.

FIG. 3 is a front view showing a processing pit according to the present invention.

FIG. 4 is a partially enlarged view showing a processing pit according to the present invention.

FIG. 5 is a partially enlarged view showing a processing pit according to the present invention.

FIG. 6 is a diagram illustrating a case body according to the present invention.

FIG. 7 is a diagram showing another configuration example of a processing pit according to the present invention.

FIG. 8 is a diagram showing a general example of an industrial waste blocking final disposal site.

FIG. 9 is a diagram showing another example of a blocking final disposal site for industrial waste.

FIG. 10 is a diagram showing another example of a blocking final disposal site for industrial waste.

[Explanation of symbols]

 33,60 Processing pit 34 Disposal layer 36,63 Natural rubber sheet 40,61 Elastic case body

Claims (1)

[Claims] An industrial waste pit, characterized in that in a barrier concrete pit for storing hazardous waste in a dump tank, an elastic material case formed by coating with a resin-based coating material is disposed on the inner surface of the dump tank.