JP2009106879A - Construction method for cleaning soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for cleaning soil which can cope with all of soil improvement, prevention of ground liquefaction and improvement of contaminated soil. <P>SOLUTION: A cleaning structure body is laid under the ground which is provided with a water collecting pipe having a plurality of holes or slits at the lower part, a cylindrical filtering member arranged at the outer periphery of the water collecting pipe and in which the outer peripheral of a cubic gap structure body stacked into a cylinder state by tangling a resin linear structure body is wound with a clothlike filter, crushed stone of quarts diorite as a cleaning material charged into the bottom part of the water collecting pipe, and a bottom cover closing the lower end opening of the water collecting pipe. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a soil purification method, and more particularly, to a soil purification method that can realize soft ground improvement, prevention of liquefaction of sandy ground, soil improvement of contaminated soil, and the like by one method.

  The conventional ground improvement method is a method of improving the ground by stirring and mixing a cement-based solidified material (for example, solidified material liquid) and excavated soil. This includes a method in which a rod having an excavating blade and a stirring blade is rotated to stir and mix a solidified material (for example, solidified material liquid) and excavated soil to form a circular-shaped improved body (for example, Patent Document 1). reference). Also, a circular saw-shaped excavation body is rotated and moved for improvement, and the same operation is repeated in the vicinity of the improved portion to improve a predetermined rectangular area portion (for example, Non-Patent Document 1). In particular, see page 81), a trencher attached to the tip of the arm of the backhoe (circulating chain part to which the excavating blade is attached) penetrates into the ground and stirs and mixes the solidified material and excavated soil (in-situ soil). A base type machine having a traveling body is provided with a method (for example, see Non-Patent Document 1, especially page 258), and a chain type excavator in which an endless chain provided with an excavating blade is stretched between upper and lower ends of a cutter post. A ground improvement method using a drilling device having a structure movable in the drilling direction along the guide frame formed (for example, refer to Patent Document 2), etc. There is a method to improve.

  Conventionally, as a method for preventing liquefaction of the ground, holes are drilled at predetermined intervals in the sand ground, and resin strings are curled in these drilled holes and laminated in a hollow laurel shape to form a contact portion between the strings. There has been provided a liquefaction prevention method in which a drainage material that is welded and a filter material is wound around an outer peripheral surface is embedded (see, for example, Patent Documents 3 and 4).

  Further, conventionally, as a soil improvement method for contaminated soil, a purification substance is filled in a container, the container is sent into the ground, exposed to the soil, and the purification substance and the contaminant are brought into contact with each other (for example, patent documents) 5), and a plurality of well points and sand piles, and by using well point groups belonging to one line and well point groups belonging to other lines adjacent to the one line, water injection and pumping are alternately performed. A method of injecting dissolved water in which nutrients or reducing agents of microorganisms in the soil are dissolved into contaminated soil using well points in the circulation purification method implemented in (for example, see Patent Document 6), etc. Is provided.

  The conventional ground improvement method that stirs and mixes the cement-based solidified material and excavated soil can improve the ground of soft ground, but cannot be used for soil improvement of contaminated soil and does not help prevent liquefaction of the ground. In addition, the conventional ground liquefaction prevention method described above is an effective method for preventing liquefaction of the ground, but is a construction method that is not very useful for ground improvement and improvement of contaminated soil, The conventional soil improvement method for contaminated soil is effective for improving contaminated soil, but is not very useful for improving the ground and preventing liquefaction of the ground. In short, these methods are not methods that can cope with all of the ground improvement, prevention of liquefaction of the ground and improvement of contaminated soil.

Therefore, as a construction method that can cope with all of the ground improvement, prevention of liquefaction of the ground, improvement of contaminated soil, etc., a plurality of three-dimensional void structures in which resin linear bodies are entangled and laminated in a hollow laurel shape, There is provided an improved construction method for contaminated soil that is buried in the soil and supplies a contaminant purification agent into the soil through the three-dimensional void structure (see, for example, Patent Document 7).
Japanese Examined Patent Publication No. 6-37767 Japanese Patent Publication No. 8-6348 JP-A-6-65913 Japanese Patent Laid-Open No. 11-1919 JP-A-11-179339 JP 2002-143828 A JP 2004-122082 A Japan Cement Association "Ground Improvement Manual with Cement-Based Solidifying Materials" Second Edition, pages 80-81, 258

This conventional method for improving contaminated soil is preferable as a method that can cope with ground improvement and prevention of liquefaction of the ground, but the ability to purify contaminated soil, the ability to strengthen the ground in ground improvement, and the ability to prevent liquefaction of the ground. There is also a point that it is desirable to improve the above.
The present invention is a soil remediation method that can cope with ground improvement, prevention of ground liquefaction, soil improvement of contaminated soil, etc. in view of such points, and further, ground strengthening ability in ground improvement, ground liquefaction The present invention provides a soil purification method that improves the prevention ability and the ability to purify contaminated soil.
Accordingly, the soil purification method of the present invention includes not only the purification of contaminated soil, but also the ground liquefaction prevention method and the soft ground improvement method.

In order to solve the above-mentioned problem, the soil purification method of the present invention is a cinnamon-like shape intertwined with a water collecting pipe having a plurality of holes or slits below and a resin linear body disposed on the outer periphery of the water collecting pipe. A columnar filter member in which a cloth-like filter is wound around the outer periphery of the three-dimensional void structure laminated on, a quartz flint meteorite crushed stone as a purifying material put into the bottom of the water collecting pipe, and a lower end of the water collecting pipe A bottom lid that closes the opening;
On the outer periphery of the water collecting pipe, the columnar filtration members arranged along the longitudinal direction are provided in contact with each other around the circumference,
While closing the lower end opening of the water collecting pipe provided with this columnar filtration member on the outer periphery with the bottom cover including the lower end surface of the columnar filtration member,
It is characterized in that it is buried in the ground as a purification structure formed by putting crushed stones of the quartz flash edge meteorite at the bottom of the water collecting pipe.

The outer periphery of the water collecting pipe having a plurality of holes or slits below is encapsulated by a katsura filter member in which a cloth filter is wound around the outer periphery of the three-dimensional void structure. Therefore, in the ground, this katsular filter member is in contact with the ground. The three-dimensional void structure is a structure in which resin linear bodies are entangled and laminated in a laurel shape (including a hollow laurel shape), and a myriad of voids communicating with each other (a hollow portion when a hollow portion exists) Therefore, groundwater flows through the three-dimensional void structure through the cloth filter and flows into the water collecting pipe from the hole or slit at the lower end of the water collecting pipe. At this time, because the quartz flint meteorite crushed stone is introduced into the bottom of the water collecting pipe, the groundwater that has flowed in contact with the quartz flint meteorite crushed stone. Since quartz splenite meteorite is a porous material and has a strong adsorption capacity, the groundwater that has come into contact with the crushed stone of this splenite meteorite is purified because adsorbed contaminants are adsorbed and contained. As a result, the contaminated soil is purified.
Moreover, even if the pore water pressure of the ground rises at the time of an earthquake, groundwater and muddy water can be ejected to the ground through the purification structure, and the pore water pressure can be dissipated to prevent the ground from liquefaction.

  In addition to the purification structure embedded in the ground, the soil purification method of the present invention embeds a plurality of three-dimensional void structures in which resin linear bodies are entangled and laminated in a hollow laurel shape in the ground In addition, the present invention is characterized in that purified water and / or pollutant cleaning agent is supplied into the ground through the three-dimensional void structure.

With this configuration, it is possible to supply purified water and a pollutant purifier to the ground (soil) and groundwater through the three-dimensional void structure, and to decompose and detoxify pollutants in the contaminated soil and contaminated groundwater. The three-dimensional void structure is formed by entangled resin linear bodies and laminated in a hollow laurel shape, and there are innumerable voids communicating with the hollow portion. Because it communicates with (soil), the supplied purified water and pollutant cleaner can penetrate into the ground (in the soil) from almost the entire outer periphery of the three-dimensional void structure, and in a short period of time, contaminated soil extensively And can be purified by penetrating into groundwater. Therefore, the contaminated soil can be purified by a synergistic effect with the purification action by the purification structure described above, and the purification efficiency is further improved.
In addition, even if the pore water pressure in the ground rises during an earthquake, groundwater and muddy water can be ejected not only from the purification structure but also from the three-dimensional void structure to the ground to dissipate the pore water pressure. Liquefaction of the ground can be prevented.

The purified water of the soil purification method of the present invention is characterized in that the purified water collected in the water collection pipe of the purification structure embedded in the ground is pumped up and used by circulation.
As a result, the purified water pumped up and the purified water supplied (supplied) circulate, so that contaminants are washed away and the purification efficiency is improved.

Further, the soil purification method of the present invention is characterized in that a solidifying material is injected into the three-dimensional void structure and / or the purification structure embedded in the ground.
With this configuration, when the solidification material is injected (poured) through the hollow portion of the three-dimensional void structure, the solidification material fills and solidifies innumerable voids and hollow portions, so that it becomes a pile structure, strengthening the ground and improving the ground Is done. In addition, since the solidified material poured into the water collecting pipe of the purification structure and the solidified material injected through the hollow portion into the three-dimensional void structure of the cinnamon-like filter member are also solidified, it becomes a large-diameter pile structure and the ground is further enhanced. Strengthened and improved ground.

Furthermore, the three-dimensional void structure and the purification structure into which the solidification material of the soil purification method of the present invention is injected are not all those embedded in the ground, but only the selected solid injection material. It is characterized by.
As a result, the three-dimensional void structure and the purification structure into which the solidifying material has been injected become a pile structure, strengthening the ground and functioning as ground improvement, and the other three-dimensional void structures and purification structures are It functions to prevent liquefaction of the ground.

According to the soil purification method of the present invention, the following effects are obtained.
(1) Soil improvement of contaminated soil, prevention of liquefaction of the ground, and improvement of the ground of soft ground can all be carried out by the method of the present invention.
(2) For example, it is not necessary to remove the purification structure and the three-dimensional void structure embedded in the ground used for soil improvement of the initially contaminated soil, and leave it to prevent ground liquefaction and improve the ground as a pile structure. Since it is not necessary to construct each work separately, the construction is efficient, and the construction cost can be reduced and it is economical.

(3) In the present invention, since the purification structure is embedded in the ground, the groundwater in the ground is filtered by the cloth filter of the katsular filter member and flows into the water collecting pipe through the three-dimensional void structure, It comes into contact with the crushed stones of quartz amphibole, and the pollutants contained in the groundwater are adsorbed and removed, so it is purified, and the contaminated soil is thereby purified.
(4) In addition to the purification structure embedded in the ground, the present invention includes a plurality of three-dimensional void structures that are entangled with resin linear bodies and stacked in a hollow laurel shape, Purified water and a pollutant cleaning agent can be supplied into the ground from this three-dimensional void structure, thereby further enhancing the purification capacity of the contaminated soil by a synergistic effect with the purification structure.
(5) In the invention of claim 3, since the purified water pumped up from the water collecting pipe and the purified water injected (supplied) into the ground circulate, the contaminants are washed away and the purification efficiency is improved.

(6) Even if the pore water pressure of the ground rises during an earthquake, groundwater and muddy water can be ejected to the ground via the purification structure and three-dimensional void structure embedded in the ground, and the pore water pressure can be dissipated. Liquefaction can be prevented.
(7) In the invention of claim 4, the purification structure and the three-dimensional void structure embedded in the ground can be made into a pile structure by injecting and solidifying the solidifying material, and the ground reinforcement of the soft ground can be achieved. Can be planned.

  (8) In the invention of claim 5, the three-dimensional void structure and the purification structure into which the solidifying material is injected function as a pile structure to strengthen the ground and function as a ground improvement, and the other three-dimensional void structure and purification structure The body functions to clean up contaminated soil and prevent liquefaction of the ground.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a half sectional view showing a soil purification method according to the first embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG.
The soil purification method according to the first embodiment shown in FIGS. 1 and 2 includes a water collecting pipe 1 having a plurality of holes or slits (hereinafter simply referred to as holes) 2 below, and the water collecting pipe 1. A columnar filtration member 3 in which a cloth-like filter 5 is wound around the outer periphery of a three-dimensional void structure 4 in which resin linear bodies are entangled and laminated in a circular shape, and a bottom portion of the water collecting pipe 1 are arranged on the outer periphery. A quartz flint crushed stone 7 as a purification material to be input and a bottom lid 6 for closing the lower end opening of the water collecting pipe 1 are provided.
These members are provided on the outer circumference of the water collecting pipe 1 along the longitudinal direction with the columnar filtration members 3 in contact with each other around the circumference, and are fastened and fixed by a fixing band 8.
The lower end opening of the water collecting pipe 1 provided with the columnar filtration member 3 on the outer periphery is closed with the bottom cover 6 including the lower end surface of the columnar filtration member 3, and at the bottom of the water collection pipe 1, Is assembled as a purification structure 10 formed by charging the crushed stone 7 and embedded in the ground G. In this embodiment, the case where the canopy 9 is provided in the top opening of the water collecting pipe 1 is shown.

  The water collecting pipe 1 may be a steel pipe or a resin pipe, but a resin pipe is preferable in consideration of lightness and workability. Examples of the water collecting pipe 1 include those having a diameter of 300 mm to 1200 mm. A hole 2 through which ground water in the ground G flows is provided below the water collecting pipe 1. A plurality of holes 2 are provided over the entire circumference of the outer peripheral surface below the water collecting pipe 1. Since the water collecting pipe 1 serves as a well hole, the hole 2 is only provided below the water collecting pipe 1.

As shown in FIGS. 3 and 4, the katsura-like filter member 3 is configured by a cloth-like filter 5 being wound around the outer periphery of a three-dimensional void structure 4 in which resin linear bodies are entangled and laminated in a hollow circular shape. ing.
Since the three-dimensional void structure 4 is formed by entangled resin linear bodies and laminated in a hollow laurel shape, there are innumerable voids communicating with each other, and these voids communicate with each other in the entire outer circumferential surface and the axial direction. The hollow portion 4a communicates with the entire outer peripheral surface through the axial direction and the gap. The three-dimensional void structure 4 of this example is formed by entangled resin linear bodies and laminated in a hollow laurel shape and has a hollow portion 4a, but the hollow portion 4a may not be provided.
5 and 6 show a case where the three-dimensional void structure 4 does not have a hollow portion. The three-dimensional void structure 4 of this example is formed by entwining resin linear bodies and laminating them in a circular shape. The three-dimensional void structure 4 has innumerable voids communicating with each other, and communicates with the entire outer peripheral surface and the axial direction via the voids.
The katsura filter member 3 filters groundwater in the ground G with a cloth filter 5, guides it through the three-dimensional void structure 4 to the hole 2 below the water collection pipe 1, and introduces it into the water collection pipe 1. . Since both three-dimensional void structures 4 communicate in the entire outer circumferential surface and the axial direction through innumerable voids communicating with each other, groundwater in the ground is taken in from almost the entire outer circumferential surface through the cloth filter 5 and collected. Although it can be guided to the hole 2 below the water pipe 1, the presence of the hollow portion 4a improves the effect of inflow and guidance of water, so that the three-dimensional void structure 4 has a hollow portion 4a. preferable.

Examples of the three-dimensional void structure 4 include those having an outer diameter of 60 mm, 100 mm, and 125 mm and a length of 2 m or 4 m. Further, when the hollow portion 4a is provided, the outer diameter is 60 mm, the inner diameter of the hollow portion 4a is 25 mm, the outer diameters are 100 mm and 125 mm, and the inner diameter of the hollow portion 4a is 60 mm. . Various diameters and lengths can be provided, and the present invention is not limited thereto.
This is selected according to the depth of embedding, but if it is too long, it is difficult to manufacture and transport, so the above-mentioned diameter and length are preferable. Therefore, when the length of the three-dimensional void structure 4 is insufficient with respect to the embedding depth, it may be used after being added.
FIG. 7 and FIG. 8 exemplify the case of adding and using in this way. The three-dimensional void structure 4 shown in FIG. 7 is obtained by forming the outer diameters at both ends in the small diameter portion 4b when the resin linear bodies are entangled and laminated in a hollow laurel shape. According to this, as shown in FIG. 8, it is possible to easily connect the three-dimensional void structures 4 and 4 by fixing them with the pins 12 using the cylindrical connection fitting 11, so that one piece is long. This is convenient because the length can be adjusted freely without having to prepare anything. This connection method is an example, and other conventionally known connection methods may be employed.

Further, since the cinnamon filter member 3 is provided in close contact with the outer peripheral surface of the water collection pipe 1 without a gap, the number provided on the outer periphery of the water collection pipe 1 depends on the outer diameter of the water collection pipe 1 and the cinnamon filtration member 3 (mainly three-dimensional It is determined by the outer diameter of the void structure 4).
The lengths of the water collecting pipe 1 and the cinnamon filter member 3 (the depth at which the purification structure 10 is buried) are determined by the state in the contaminated ground G. For example, the deeply contaminated portion needs to be buried up to the depth of the contaminated ground G using the long water collecting pipe 1 and the katsular filter member 3, and is only contaminated to a shallow portion. In this case, the short water collecting pipe 1 and the cinnamon filter member 3 up to that portion may be used.

  Since the cinnamon filter member 3 is located in the ground, it is preferable that the cloth filter 5 used therein has water resistance, corrosion resistance, chemical resistance, and the like. As an example, a cloth-like filter composed of a resin nonwoven fabric can be exemplified.

  Quartz splenite meteorite is a porous material and has a strong adsorption power, and therefore adsorbs, contains, and purifies contaminants contained in groundwater that come into contact with this quartz flint meteorite. The reason why the quartz flint meteorite is used as the crushed stone 7 in the present invention is to increase the contact area with the passing ground water, thereby improving the effect. Since shell fossils have the same actions and effects as quartz flint meteorites, crushed fossil shell shells may be used instead of quartz flint meteorites, or a mixture of both crushed stones may be used.

Further, the number and interval of burying the purification structure 10 are determined by the state of the contaminated ground G. For example, in the ground G contaminated with a high concentration, a large number may be embedded at a narrow (small) interval, and in a low concentration contaminated ground G, the number may be small at a wide (large) interval. Therefore, when embedding the purification structure 10, it is preferable to conduct a preliminary survey on the ground G and determine the depth, interval, number, etc. of embedding.
Further, the buried purification structure 10 serves as a weight and is firmly fixed on the ground G because the quartz flint meteorite 7 is placed at the bottom of the water collecting pipe 1.

Next, an example of a construction method for embedding the purification structure 10 in the ground G will be described.
First, a casing pipe is inserted into the ground G. The casing tube is inserted by inserting an auger rod having an auger into the casing tube, rotating the auger with a construction machine to drill the hole, and pushing the casing tube into the drilled hole. Conventionally well-known methods such as a method of pulling up the auger by a double pipe drilling method using a casing tube as an outer tube can be employed. Next, the purification structure 10 assembled in advance on the ground is inserted into the casing tube. When the insertion of the purification structure 10 into the casing pipe is completed, the purification structure 10 is left in the drilling hole (ground), and the casing pipe is pulled out to the ground. Thereby, the purification structure 10 can be embedded in the ground G. It is preferable that the quartz flint meteorite crushed stone 7 is buried in the ground and then introduced from the upper opening of the water collecting pipe 1 because the construction becomes easier because it becomes lighter at the time of embedding construction. In addition, the construction method of this purification | cleaning structure 10 does not comprise this invention.

Thus, according to the first embodiment, the outer periphery of the water collecting pipe 1 having a plurality of holes 2 below is encapsulated by the cinnamon-like filtering member 3, which constitutes the cinnamon-like filtering member 3. The three-dimensional void structure 4 is formed by intertwining resin linear bodies and laminating them in a circular shape. The three-dimensional void structure 4 is communicated in the entire outer circumferential surface and the axial direction by an infinite number of voids and hollow portions 4a. Accordingly, the groundwater in the ground G is filtered by the cloth filter 5 of the katsura-like filter member 3 and enters the voids of the three-dimensional void structure 4 from almost the entire outer peripheral surface. The water is guided to the hole 2 portion of the water collecting pipe 1 and flows into the water collecting pipe 1 from the hole 2. At this time, since the quartz flint meteorite crushed stone 7 is introduced into the bottom of the water collecting pipe 1, the inflowing groundwater passes or stays in contact with the quartz flint meteorite crushed stone 7. Since the quartz amphibole is a porous material and has a strong adsorption capability, the ground water that has come into contact with the crushed stone 7 of this quartz amphibole is adsorbed and purified. That is, the groundwater contaminated by permeating through or passing through the contaminated ground G is filtered by the cloth filter 5 and purified by the crushed stone 7 of the quartz-blind meteorite. The purified water in the water collecting pipe 1 is pumped up and discharged to the outside. As a result, the contaminated soil is purified (improved).
In addition, even if an earthquake occurs during the purification of this contaminated soil and the pore water pressure of the ground G rises, groundwater and mud can be ejected to the ground via the purification structure 10 to dissipate the pore water pressure. The ground can be prevented from liquefaction.

Further, the buried purification structure 10 is left even after the purification of the contaminated soil is completed, and can be used as necessary to prevent liquefaction of the ground or improve the ground.
That is, the water collecting pipe 1 is a hollow cylindrical shape, and the three-dimensional void structure 4 is formed by intertwining resin linear bodies and laminated in a hollow laurel shape, and there are innumerable voids communicating with the hollow portion 4a. Therefore, even if the pore water in the ground rises at the time of the earthquake, the groundwater and muddy water can be ejected to the ground via the purification structure 10 to dissipate the pore water pressure, and the ground can be prevented from being liquefied. Further, when the solidifying material is poured into the water collecting pipe 1 and the hollow portion 4a of the three-dimensional void structure 4, the solidifying material is solidified within the water collecting tube 1 and the innumerable voids and the hollow portion 4a of the three-dimensional void structure 4. It becomes a pile structure, the ground is strengthened, and the ground can be improved.

FIG. 9 is a cross-sectional view showing a soil purification method according to the second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. To do.
In the second embodiment, a plurality of three-dimensional void structures 4 are embedded in the ground G around the embedded purification structure 10, and the others are the same as those in the first embodiment. The three-dimensional void structure 4 of this example is formed by entwining resin linear bodies and laminating them in a hollow laurel shape, and has a hollow portion 4a. As described above, the three-dimensional void structure 4 has innumerable voids communicating with each other, and the hollow portion 4a communicates with the outside from almost the entire outer peripheral surface through the voids. The three-dimensional void structure 4 embedded around the purification structure 10 at a predetermined interval is for supplying purified water and a contaminant purification agent into the ground.
The three-dimensional void structure 4 can be embedded in the ground G by a method using a casing tube similar to the purification structure 10.

Thus, when purified water or a contaminant purifying agent is supplied from the hollow portion 4a of the three-dimensional void structure 4 embedded in the ground G, the hollow portion 4a is In order to communicate with the soil (ground G) at almost the entire outer peripheral surface thereof, the purified water and the contaminant purification agent supplied through the hollow portion 4a are introduced into the soil (in the ground G from the entire outer peripheral surface of the three-dimensional void structure 4). ) And penetrate into the ground (soil) and groundwater. As a result, the contaminated soil can be washed and the contaminated soil and the contaminated groundwater can be decomposed and made harmless over a wide range. Further, the groundwater is filtered and purified by the purification structure 10 as described above, and the water collecting pipe. Pumped from 1 and drained outside. Accordingly, it is possible to purify the contaminated soil with higher effectiveness.
Even if an earthquake occurs during the purification of this contaminated soil, the embedded three-dimensional void structure 4 has innumerable voids communicating with the hollow portion 4a, so that even if the pore water pressure of the ground increases due to the earthquake, Groundwater and muddy water can be ejected from the three-dimensional void structure 4 to the ground to dissipate the pore water pressure, and the ground liquefaction can be prevented by a synergistic effect with the purification structure 10.

Moreover, the embedded three-dimensional void structure 4 is left even after the purification of the contaminated soil is completed, and can be used as necessary to prevent liquefaction of the ground or improve the ground.
That is, the three-dimensional void structure 4 can be left to prevent liquefaction of the ground as described above. When the solidification material is poured from the hollow portion 4a of the three-dimensional void structure 4, the solidification material is Since the innumerable voids and the hollow portion 4a are filled through the hollow portion 4a and solidified, it becomes a pile structure, and the ground can be improved with the ground strengthened.

  FIG. 10 is a cross-sectional explanatory view showing the soil purification method according to the third embodiment of the present invention, and the same components as those in the first and second embodiments are denoted by the same reference numerals. A detailed description will be omitted. In the third embodiment shown in FIG. 10, a pump 13 is provided in the water collection pipe 1 of the purification structure 10 in the second embodiment, and the purified water in the water collection pipe 1 is pumped through the pumping pipe 14. 13 is pumped into the septic tank 15, and the purified water in the septic tank 15 is again supplied to the hollow portion 4 a of the three-dimensional void structure 4 through the water absorption pipe 17 by the pump 16 and injected (supplied) into the ground G (in the soil). It is what I did.

According to the third embodiment, purified water pumped from the water collecting pipe 1 to the septic tank 15 is supplied to the plurality of three-dimensional void structures 4 embedded in the ground G through the water absorption pipe 17 by the pump 16. Is done. Since the three-dimensional void structure 4 has innumerable voids communicating with the hollow portion 4a as described above, the supplied purified water enters the ground G radially from almost the entire outer peripheral surface of the three-dimensional void structure 4. To penetrate. The infiltrated purified water flows into the purification structure 10 again as groundwater, becomes a circulation type that is purified and pumped up from the water collecting pipe 1, and a flow toward the purification structure 10 of the supplied purified water occurs. As a result, the contaminated soil is washed and purified.
In the third embodiment, a contaminant purifying agent is added to and dissolved in the purified water in the septic tank 15, and the dissolved water is supplied to the three-dimensional void structure 4 embedded in the ground G. Good. According to this, dissolved water to which a pollutant purification agent is added is supplied into the ground G and penetrates into the ground G. Therefore, since the dissolved pollutant purifying agent decomposes and purifies the pollutants in the soil, a synergistic effect with the above effect is exhibited and the purifying effect is improved.
In the septic tank 15, the pumped purified water may be further purified, and this is preferable because the purified water is supplied to the three-dimensional void structure 4. In this case, it is desirable that the contaminant purifying agent is also added to the purified water purified by the septic tank 15, dissolved and supplied.

In addition, although the solid space | gap structure body 4 in FIG. 10 explaining this 3rd Embodiment has shown the case where it is embed | buried perpendicularly to the ground G, it is not limited to this. The length of the three-dimensional void structure 4 may be changed depending on the condition of the ground G to be purified, or may be embedded obliquely. In the case of burying at an angle, when there is a structure on the ground G to be purified, it can be implemented without removing the structure.
Further, the number, embedding interval, position, and the like of the purification structure 10 and the three-dimensional void structure 4 to be embedded are also determined by the soil contamination status, the contamination concentration, and the like. For example, the use of ground, analysis of existing well water, ground surface contamination, ground and groundwater surveys by boring, etc. are performed to identify pollutants, evaluate the pollution status, and purify structure 10 And the number, embedding interval, embedding direction, how long to implement, how long the implementation interval should be, and the type, amount, etc. of the pollutant purifier should be determined. To do.

  The above embodiment is not intended to limit the present invention, and various modifications of the present invention are allowed without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a soil purification method according to a first embodiment of the present invention. FIG. 1A is a cross-sectional view taken along line AA. It is a perspective view which shows a cinnamon filter member. It is a partial expansion perspective view which expands and shows a cinnamon filter member. It is a perspective view which shows another cinnamon filter member. It is a partial expansion perspective view which expands and shows other cinnamon filter members. It is a perspective view which shows another cinnamon filter member. It is a perspective view which illustrates the case where a cinnamon filter member is added. It is sectional drawing which shows the purification method of the soil which concerns on 2nd Embodiment of this invention. It is sectional explanatory drawing which shows the purification method of the soil which concerns on 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water collecting pipe 2 Hole or slit 3 Katsura filter member 4 Three-dimensional void structure 4a Hollow part 5 Cloth filter 6 Bottom cover 7 Quartz crushed stone 10 Purification structure 11 Connection metal fitting 12 Pin 13 Pump 14 Pumping pipe 15 Septic tank 16 Pump 17 Water supply pipe

Claims (5)

A cloth-like filter is wound around the outer periphery of a three-dimensional void structure that is arranged in a circular pie shape by interlacing a water collecting pipe having a plurality of holes or slits below and a resin linear body arranged around the water collecting pipe. A columnar filtration member, a crushed quartz flint meteorite as a purification material to be introduced into the bottom of the water collecting pipe, and a bottom lid that closes the lower end opening of the water collecting pipe,
On the outer periphery of the water collecting pipe, the columnar filtration members arranged along the longitudinal direction are provided in contact with each other around the circumference,
While closing the lower end opening of the water collecting pipe provided with this columnar filtration member on the outer periphery with the bottom cover including the lower end surface of the columnar filtration member,
A soil purification method characterized by burying in the ground as a purification structure in which the crushed stone of quartz flint meteorite is introduced at the bottom of a water collecting pipe.   In addition to the purification structure embedded in the ground, a plurality of three-dimensional void structures entangled with resin linear bodies and laminated in a hollow laurel shape are buried in the ground, and purified water and 2. The soil purification method according to claim 1, wherein a pollutant cleaning agent is supplied into the ground.   The soil purification method according to claim 2, wherein the purified water is used by pumping and circulating the purified water collected in a water collection pipe of a purification structure embedded in the ground.   A soil purification method characterized by injecting a solidifying material into the three-dimensional void structure and / or purification structure embedded in the ground. The soil according to claim 4, wherein the three-dimensional void structure and the purification structure into which the solidifying material is injected are not all of the solid structure embedded in the ground, but the solidifying material is injected only into selected ones. Purification method.

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