JPH0741233B2 - Waste disposal method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of disposing waste, and more particularly to a method of disposing waste in a disposal pit formed in the ground.

[0002]

2. Description of the Related Art Conventionally, waste disposal methods have been
For example, a method is known in which waste is transported to a final disposal site that uses a depression in a mountainous area, and landfilled while covering the soil. Further, in urban areas, there are proposed a plan to construct a large-scale space under a public facility such as a road or a park to be a disposal site, and a method to construct a long hole in the ground to be a disposal space.

[0003]

However, in the case of a landfill site such as a mountainous area, it is difficult to secure the site of the landfill site due to the recent urbanization of the mountainous area and resorting, and the site becomes remote. Transport costs are high. Also,
The disposal amount per unit area of the disposal site is small, so the disposal efficiency is poor, and in addition, contact water during disposal or after landfill disposal,
Leachate water treatment is required.

Further, the method of constructing the waste space in the urban area has a problem that the construction cost is higher than the disposal capacity of the waste.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to enable the disposal of waste in a city and to provide a large amount of disposal per unit area. Another object of the present invention is to provide a waste disposal method capable of preventing contact water, leachate, etc. from flowing out.

Another object of the present invention is to provide a method of disposing of waste which is inexpensive in construction cost of the waste space. Still another object of the present invention is to provide a waste disposal method capable of simultaneously performing ground improvement.

[0007]

The present invention has been made in view of the above object, and its gist is to form a waste disposal pit filled with mud in the hole by various drilling methods. And the disposal pit, a bag made of a stretchable water blocking material is placed along the perforated pipe in the bag and waste is thrown in, and the bag is sunk to a predetermined depth while maintaining balance with buoyancy due to muddy water. There is a method of disposing of waste, which comprises a step and a step of charging the waste into a bag that has been sunk through the perforated pipe and filling the disposal pit with the waste.

The present invention can dispose of all kinds of waste such as industrial waste and household waste, and is particularly suitable for disposal of incinerated ash and non-combustible crushed waste which are difficult to dispose.

The drilling method used in the present invention is used for construction of cast-in-place piles such as reverse circulation construction method and earth drill construction method, and for construction of continuous underground wall such as Icos construction method and earth auger construction method. Although a construction method can be mentioned, it is preferable to use the reverse circulation construction method in view of the diameter of the disposal pit and the perforation length.

The bag made of the stretchable water-blocking material is
Cylindrical bag made of EPDM (a compound having a double bond in ethylene and propylene as the third component with a double bond), polyvinyl chloride, high-density polyethylene, ultra-high-molecular-weight polyethylene, etc., and wrapping waste in the disposal pit Is formed.

[0011]

In the present invention, first, a waste disposal pit is bored in the ground by a well-known drilling method such as the reverse circulation method. The wall surface during or after drilling is protected by filling the disposal pit with muddy water. Next, a bag made of a stretchable waterproof material is inserted into the disposal pit. When inserting, discard a certain amount of waste as a fluid substance in the bag so that it does not float up due to the buoyancy of muddy water, or as a solidified substance that is slightly smaller than the diameter of the disposal pit, and dispose of the perforated pipe from above. Insert the bag and sunk the bag while keeping the balance with the buoyancy caused by muddy water. When the bag is submerged to a predetermined depth, waste is further pumped and dumped into the bag. As a result, the bag expands due to the pressure of the waste and comes into close contact with the hole wall, and the waste is filled in the charging hole as a columnar body covered by the bag.

[0012] Here, the perforated pipe acts so as to ensure a waste input path even if the bag is crushed from the surroundings by mud pressure.

When the waste is a slurry-like waste containing a solidifying agent, the waste can be easily put into the bag, and the use of a pressure pump makes it easier to put the waste.

The surrounding waste can be compacted by increasing the charging pressure of the slurry waste filled in the disposal pit. In addition, when the bag is inserted into the disposal pit, if a vertical drainage member that communicates with the ground along the bag is attached to the inner surface of the bag or the inner surface and the outer surface thereof, when the waste solidifies. The separated water can be easily discharged, and the consolidation of the ground can be further promoted.

If the stretchable water-impervious material is welded above the disposal pit in the vertical direction, that is, in the vertical direction, the continuous work is facilitated as compared with the method of welding in the vertical direction or in the spiral shape. The soil can be effectively consolidated by flexibly responding to the deformation caused by the input of waste.

[0016]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, in this embodiment, the diameter φ = 3.0 m by the reverse circulation method,
A waste disposal pit 10 with an extension of L = 200 m is provided.
Therefore, about 1400 m ³ of waste can be disposed. The diameter and length of the disposal pit can be arbitrarily set depending on the capability of the punching machine, the design disposal amount of waste, and the like. Generally, the diameter φ is 1 to 6 m and the extension L is 2 m.
It is preferably about 00 m. The disposal pit 10 during or after perforation is filled with muddy water 11 to protect the perforation wall.

After perforation is complete, the reverse circulation equipment is removed and, as shown in FIG. 2, the disposal pit 1
A bag 12 made of a stretchable water-blocking material such as EPDM, polyvinyl chloride, high-density polyethylene, or ultra-high-molecular-weight polyethylene is inserted in No. 0. The bag 12 is inserted while forming both ends of the stretchable water-impervious sheet in the longitudinal direction continuously above the opening of the disposal pit 10 to form a tubular bag. For this welding operation, a known welding machine such as a warm air welding machine manufactured by Leister Corporation (Switzerland) can be used. In addition, since the sedimentation is prevented by the buoyancy of the muddy water 11 filled in the disposal pit 10 only with the bag 12, a predetermined amount of the fluid or the solidified waste 13 is put into the bag to increase the buoyancy of the muddy water 11. Sink while maintaining the balance of. Since the bag is crushed by muddy water pressure in the upper part of the disposal pit 10 during the sunk, the perforated pipe 14 is hung by a crane or the like, and the bag 10 is sunk while being inserted into the bag from above, so that the waste 20 to be put in later is Secure a loading path.

When the bag 12 reaches the bottom of the hole, as shown in FIG.
0 is filled in the hole as a columnar body covered with the bag 12.

Here, the waste 20 which is incinerated ash is a slurry-like waste obtained by mixing a cement or gypsum-based solidifying material and a liquid, and the inside of the perforated pipe 14 via the pressure feed pipe 15 by the pressure feed pump 16. To be sent to. The amount of the solidifying material mixed in the waste 20 can be arbitrarily determined according to the strength according to the purpose, but since the strength is about 10 kg / cm ² , it is 3
It is preferable that the content is mixed up to 5%.

The muddy water 11 overflowing from the disposal pit 10 while the bag 12 is being sunk and the waste 20 is being charged is discharged by the discharge pump. Further, the slurry-like waste material 20 introduced into the perforated pipe by the pressure feeding pipe 15 is pushed out in the wall surface direction through the holes of the perforated pipe 14. Here, the perforated pipe 14
Are left in the disposal pit 10 and buried in the waste 20. Further, the waste 20 may be charged through a tremie tube provided in the perforated tube 14 and the tremie tube.

Then, the waste 20 to be injected is solidified by the action of the solidifying material, and the injection pressure is increased to consolidate the ground around the bag 12. Where bag 1
Since the drain material 18 made of non-woven fabric, paper or the like is attached to the inner surface and the outer surface of 2 in the depth direction of the disposal pit 10, the drain material 18 attached to the inner surface removes the separated water from the waste at the time of solidification. In addition to being easily discharged, the drain member 18 attached to the outer periphery can form a drainage channel for discharging the consolidated water to promote the consolidation.

In addition, the waste in the disposal pit is shown in FIG.
As shown in (1), after the completion of charging, the entire circumference is covered with the bag 12 and buried in the ground and finally solidified, so that harmful contact water, leachate, etc. do not permeate and flow out into the ground.

[0024]

As described above, according to the present invention, a step of forming a waste disposal pit in the ground, a step of depositing a bag made of a stretchable water blocking material in the disposal pit, and the inside of the bag Since it is composed of a process of throwing waste into a large amount of waste, it is possible to dispose a large amount of waste in the input hole with a small occupation area by extending the length of the disposal pit even in a small site in the suburbs of the city. At the same time, by wrapping the waste in a bag, it is possible to prevent contact water and leachate from flowing out. Further, the waste disposal space can be provided at low cost only by the step of boring the ground. Further, by throwing in the waste as slurry-like waste mixed with the solidifying material and the liquid, and increasing the internal pressure thereof, the consolidation of the surrounding ground can be promoted and the ground can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a situation in which a waste disposal pit is bored by a reverse circulation method.

FIG. 2 is an explanatory view showing a situation in which a bag made of a stretchable water-impervious material is sunk in a disposal pit.

FIG. 3 is an explanatory view showing a situation in which waste is put into a bag.

FIG. 4 is an explanatory diagram showing a situation in which the input of waste to the disposal pit is completed.

[Explanation of symbols]

 10 Disposal Pit 11 Muddy Water 12 Bags 13 Waste 15 Pump Pipe 17 Drain Hole 18 Drain Material

Claims (4)

[Claims] 1. A process of forming a waste disposal pit filled with muddy water in the hole by various drilling methods, and a bag made of a stretchable water-impervious material in the disposal pit. Disposing the waste along the pipe and depositing it to a predetermined depth while maintaining the balance with the buoyancy due to muddy water, and throwing the waste through the perforated pipe into the deposited bag and disposing the waste. A method of disposing of waste, which comprises a step of filling the pit with waste. 2. The method for disposing waste according to claim 1, further comprising the step of converting the waste into slurry-like waste containing a solidifying agent. 3. The waste disposal method according to claim 1, further comprising a step of additionally providing a drainage member along the longitudinal direction on the inner surface or the inner surface and the outer surface of the bag made of the stretchable water-impervious material. 4. The waste disposal method according to claim 1, further comprising the step of welding the stretchable water-impervious material in a vertical direction to form a cylindrical bag.