JP2012125729A - Soil cleaning apparatus, and soil cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permeate a cleaning agent properly and evenly to soil to be cleaned.SOLUTION: A soil cleaning apparatus includes: a tubular inner rod 2 that has a circulation channel in which the cleaning agent C and compressed air A circulate; an air packer 3 that is provided downstream of the inner rod 2, and expands by the compressed air A that enters from the inner rod 2; a screen 4 that is provided downstream of the air packer 3, and discharges the cleaning agent C having entered from the inner rod 2 to the external; and a tubular casing 5 that can be driven into the soil G in a condition that it accommodates the screen 4, the air packer 3, and the inner rod 2 in the tube, and can be pulled out from the soil G leaving the screen 4, the air packer 3, and the inner rod 2 in the soil G.

Description

  The present invention relates to a soil purification device and a soil purification method for purifying soil by allowing a purification agent to penetrate into contaminated soil.

  For example, when soil is contaminated with organic halides or hexavalent chromium, it is necessary to purify the soil, and there is a purification method for purifying soil by injecting a purifier containing iron fine particle slurry into the soil. It is known (for example, refer to Patent Document 1). In this purification method, the injection pipe is driven into the contaminated soil, the purification agent is supplied from the upper end of the injection pipe, and the purification agent is discharged from the lower end of the injection pipe, thereby injecting the purification agent into the soil. It is.

JP 2005-138107 A

  By the way, in the purification method as described above, since the purification agent is simply injected with the injection tube being driven into the soil, where the purification agent permeates depends on the state and properties of each part of the soil. For example, when the injection tube is driven into the soil, cracks are generated in the soil. Depending on the occurrence of the cracks, the penetration site of the purifier is greatly dependent. For this reason, there are cases where the purifying agent permeates only in some parts, the purifying agent penetrates sparsely, or the purifying agent does not penetrate into the part to be purified. Furthermore, simply supplying a cleaning agent from the upper end of the injection pipe to inject and infiltrate the cleaning agent into the soil. For example, in a highly viscous soil, the cleaning agent does not permeate, or the soil cannot be purified or the soil is purified. In order to achieve this, there was a problem that injection tubes had to be driven into a large number of sites.

  Accordingly, an object of the present invention is to provide a soil purification apparatus and a soil purification method that can allow the purification agent to permeate into the soil to be purified appropriately and evenly.

  In order to achieve the above object, the invention described in claim 1 is a soil purification apparatus for infiltrating a purification agent into contaminated soil, and is tubular and has a first flow passage through which the purification agent flows and expansion. A second flow path through which the working fluid flows is provided in the pipe, and is provided on the downstream side of the flow pipe, and is expanded by the expansion fluid flowing in from the second flow path of the flow pipe. An expansion / contraction tube, a discharge tube that is provided on the downstream side of the expansion / contraction tube and discharges the purifier flowing in from the first flow passage of the flow tube to the outside, and has a tubular shape, the discharge tube and the expansion / contraction tube, A storage pipe that can be driven into the soil in a state in which the flow pipe is housed in the pipe, and that can be pulled out of the soil while leaving the discharge pipe, the expansion / contraction pipe, and the flow pipe in the soil. .

  A second aspect of the present invention is the soil purification apparatus according to the first aspect, wherein the second apparatus is provided on the downstream side of the discharge pipe and expands by the expansion fluid flowing in from the second flow passage of the flow pipe. It is characterized by comprising the expansion / contraction tube.

  Invention of Claim 3 is the soil purification method using the soil purification apparatus of Claim 1, Comprising: In the state which accommodated the said discharge pipe, the expansion / contraction pipe | tube, and the distribution pipe in the said storage pipe, The discharge pipe side is directed to the soil, the storage pipe is driven into the soil, the storage pipe is pulled out from the soil, the discharge pipe, the expansion / contraction pipe, and the distribution pipe are embedded in the soil, and the second distribution of the distribution pipe In a state where the expansion fluid is supplied to the passage and the expansion / contraction tube is expanded, a purification agent is supplied to the first flow passage of the flow pipe, and the purification agent is discharged from the discharge pipe to the soil. It is characterized by that.

  According to the invention described in claims 1 and 3, in a state where the discharge pipe, the expansion / contraction pipe, and the flow pipe are embedded in the soil, the discharge pipe is located at the deepest position, that is, the site where the purifying agent is to penetrate, The expansion / contraction tube is located above the tube. Then, by expanding the expansion / contraction tube, the surrounding soil is subjected to pressure to increase the density (for example, the crack formed by driving is closed), and the purifier is released from the discharge tube in this state. Therefore, the penetration of the purifier into the expansion / contraction tube side is suppressed. For this reason, it becomes possible for the purifier to penetrate more into the periphery of the discharge pipe, and to permeate the purifier evenly and appropriately into the soil site to be purified. Furthermore, since the purifying agent is released from the discharge pipe in a state where the purifying agent is prevented from penetrating above the discharge pipe, that is, the place of the purifying agent is limited around the discharge pipe. Even in soil with high viscosity, it is possible to allow the purifier to penetrate into a desired site.

  According to the second aspect of the present invention, since the second expansion / contraction tube is provided on the downstream side of the discharge tube, that is, the lower side of the discharge tube, the discharge tube is expanded in a state where the two expansion / contraction tubes are expanded. The soil part located in the upper part and the lower part of is subjected to pressure, and the penetration of the purifier into this part is suppressed. In other words, since the penetration of the discharge pipe into the upper and lower sides of the discharge pipe is suppressed, the purification agent penetrates more only around the discharge pipe, and it is possible to penetrate the purification agent more appropriately and evenly into the soil site to be purified. Become.

It is a schematic block diagram which shows the soil purification equipment provided with the purification | cleaning unit which concerns on Embodiment 1 of this invention. It is a schematic block diagram of the purification | cleaning unit of FIG. It is sectional drawing of the inner rod of the purification | cleaning unit of FIG. It is sectional drawing which shows the injection | pouring head of the purification | cleaning unit of FIG. It is sectional drawing of the air packer of the purification | cleaning unit of FIG. It is a front view (partial sectional view) of the screen of the purification unit of FIG. It is sectional drawing of the casing of the purification | cleaning unit of FIG. It is sectional drawing which shows the buffer piece periphery of the purification | cleaning unit of FIG. It is a figure which shows the soil purification method and procedure using the purification unit of FIG. It is a figure which shows the state in the soil of step S3 in the soil purification method of FIG. It is a schematic block diagram of the purification | cleaning unit which concerns on Embodiment 2 of this invention. It is sectional drawing of the air packer of the purification | cleaning unit of FIG. It is sectional drawing of the screen of the purification | cleaning unit of FIG. It is sectional drawing of the front end air packer of the purification | cleaning unit of FIG. It is a figure which shows the soil purification method and procedure which use the purification unit of FIG.

  The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram showing a soil purification facility 10 provided with a purification unit (soil purification device) 1 according to this embodiment. This purification unit 1 is a device for infiltrating the purification agent C into the contaminated soil G, and as shown in FIG. , A screen (discharge pipe) 4 and a casing (accommodating pipe) 5 are provided. Here, the purifier C is selected based on the pollutant and contamination status of the soil G. For example, when the soil G is contaminated with VOCs (volatile organic compounds) or oil, an oxidizing agent (hydrogen peroxide solution, persulfate, etc.), a reducing agent, a microbial activator, etc. are used as the purifier C. Used as. In addition, contamination and purification of the soil G include contamination and purification of groundwater.

  The inner rod 2 is tubular as shown in FIG. 3, and a first flow passage 2a through which the purifier C flows and a second flow passage 2b through which compressed air (expansion fluid) A flows are provided in the pipe. It has been. Specifically, a small-diameter inner tube 22 is concentrically disposed in a large-diameter outer tube 21 via a bridge 23, and a space between the outer tube 21 and the inner tube 22 is first. One flow passage 2a and the inside of the inner pipe 22 constitute a second flow passage 2b. Further, a connection female screw 21a is formed on the inner surface of both ends of the outer tube 21, and a connection tube 24 is connected to one (downstream) connection female screw 21a.

  The connection pipe 24 is a double pipe, and at both ends of the connection outer pipe 241, connection male threads 241 a that are screwed with the connection female threads 21 a are formed, and the inner pipe 22 is inserted into the connection inner pipe 242. The connection inner tube 242 and the inner tube 22 are connected. The plurality of inner rods 2 can be connected by screwing the connection male screw 241 a on the free end side of the connection pipe 24 to the connection female screw 21 a of the other inner rod 2.

  An injection head 6 as shown in FIG. 4 is attached to the most upstream side (ground side) ends of the plurality of inner rods 2 connected in this way. The injection head 6 is formed with a head male screw 6a that is screwed into the connecting female screw 21a of the inner rod 2, and a head insertion into which the inner tube 22 of the inner rod 2 is inserted when screwed into the connecting female screw 21a. A hole 6b and a head flow passage 6c having a ring-shaped cross section that is in circulation and communication with the first flow passage 2a are formed. In addition, an air pipe connection portion 61 that circulates and communicates with the head insertion hole 6b and a purifier pipe connection portion 62 that circulates and communicates with the head flow passage 6c are provided. Then, as will be described later, the air hose 151 is connected to the air pipe connection part 61 and the discharge hose 132 is connected to the purifier pipe connection part 62, thereby compressing the second flow passage 2 b of each inner rod 2. Air A flows, and the purifier C flows through the first flow passage 2a.

  The air packer 3 is a tube that is attached to the downstream side (front end side) of the inner rod 2 and expands by the compressed air A that flows in from the second flow passage 2 b of the inner rod 2. Specifically, as shown in FIG. 5, fixtures 32 and 33 are attached to both ends of a rubber tube 31 made of elastic rubber and tubular, and the packer inner tube 34 is connected to the rubber tube by the fixtures 32 and 33. 31 is disposed concentrically. A gap 3 a is formed between the rubber pipe 31 and the packer inner pipe 34 in a state where the compressed air A is not supplied.

  Further, the free end portion side of the first fixing tool 32 is substantially cylindrical, is formed with a packer female screw 32a that is screwed with the connection male screw 241a of the inner rod 2, and the slide piece 35 slides in the axial direction. Arranged freely. On the other hand, a groove (not shown) extending to the gap 3a along the axial direction is formed on the outer periphery of the end portion of the packer inner tube 34 on the first fixing tool 32 side. Then, the slide tube 351 of the slide piece 35 is inserted into the connection inner tube 242 by screwing the connection male screw 241a into the packer female screw 32a. In this state, the compressed air A from the second flow passage 2b of the inner rod 2 enters the groove of the packer inner tube 34 through the slide tube 351, and is filled with the gap 3a, so that the rubber tube 31 expands. Here, the rubber tube 31 expands to an outer diameter that is approximately twice the outer diameter of the contracted state when no external force is applied.

  Subsequently, the slide plate 352 of the slide piece 35 is pushed by the purification agent C from the first flow passage 2a of the inner rod 2, and the slide piece 35 hits the body surface 32b, and the purification agent C becomes the body surface 32b. It flows into the packer inner tube 34 through a hole (not shown) formed in the tube. Further, when the supply of the compressed air A is stopped, the rubber tube 31 contracts and the slide piece 35 returns to the original position. Further, a packer male screw 34 a is formed at the free end of the packer inner tube 34 protruding from the second fixture 33. Here, the configuration of the air packer 3 may be the same as that of the air packer 3 according to the second embodiment to be described later.

  The screen 4 is a tube that is attached to the downstream side of the air packer 3 and discharges the purifier C that has flowed in from the first flow passage 2 a of the inner rod 2 through the air packer 3. Specifically, as shown in FIG. 6, a main pipe male screw 411 is formed at both ends of the main pipe 41, and is coupled to the upstream main pipe male screw 411 so that the coupling 42 is attached. The coupling 42 has a cup female screw 42 a screwed with the packer male screw 34 a of the air packer 3, and a communication hole 42 b that connects and communicates the cup female screw 42 a and the main pipe 41. Yes. Further, a plurality of discharge holes 41a penetrating into the pipe are formed on the side surface of the main pipe 41, and the purifier C from the air packer 3 flows into the main pipe 41 with the packer male screw 34a screwed into the cup female screw 42a. Then, the purifier C is discharged to the outside from the discharge hole 41a.

  On the other hand, a tip cone 43 is attached by screwing into a main pipe male screw 411 on the downstream side of the main pipe 41. The tip cone 43 has a conical tip, and the purification unit 1 can be driven into the soil G as described later. Here, the main pipe 41 may be constituted by one or may be constituted by connecting a plurality of pipes in accordance with the required length, handleability, and the like.

  The casing 5 is tubular and can be driven into the soil G with the screen 4, the air packer 3 and the inner rod 2 accommodated in the pipe, and the screen 4, the air packer 3 and the inner rod 2 remain in the soil G. It is a tube that can be pulled out from G. Specifically, as shown in FIG. 7, the inner diameter is set to be slightly larger than the outer diameter of the inner rod 2 and the air packer 3, and the outer diameter is set to be substantially the same as the outer diameter of the tip cone 43 of the screen 4. ing. An accommodating female screw 5a is formed on the inner surface of the upstream end portion, an accommodating male screw 5b is formed on the outer surface of the downstream end portion, and an accommodating male screw 5b of another casing 5 is formed on the accommodating female screw 5a. The plurality of casings 5 can be connected by screwing together.

  When the screen 4 or the air packer 3 is accommodated in such a casing 5 and driven into the soil G, first, a cylindrical tip casing is attached to the housing male screw 5b of the casing 5 at the tip (tip cone 43 side). Install. Then, the screen 4 and the like are accommodated in the casing 5 so that the tip casing shoe contacts the shoulder 43 a of the tip cone 43. On the other hand, as shown in FIG. 8, a cylindrical casing head 51 is attached to the accommodating female screw 5a of the casing 5 at the rear end (the ground side). Then, in a state where a desired number of inner rods 2 are connected and a plurality of casings 5 are connected in accordance with the number and length, the inner rod 2 at the rear end protrudes from the casing head 51 as shown in the figure. In this state, the buffer piece 52 is attached.

  That is, the buffer piece 52 is tubular, and a large-diameter portion 52a into which the casing 5 can be inserted and a small-diameter portion 52b into which only the inner rod 2 can be inserted are formed in the pipe, and the large-diameter portion 52a and the small-diameter portion 52b. The boundary is a stepped portion 52c. The screen 4, the air packer 3, and the inner rod 2 are driven into the soil G together with the casing 5 by pressing the buffer piece 52 toward the casing 5 with the casing head 51 hitting the stepped portion 52 c. That is, the tip casing 5 (tip casing shell) pushes the tip cone 43, and the screen 4, the air packer 3, and the inner rod 2 are driven into the soil G. Further, by removing the buffer piece 52 and pulling out the casing 5, the tip cone 43, the screen 4, the air packer 3, and the inner rod 2 are embedded (dried) in the soil G.

  As shown in FIG. 1, the soil purification facility 10 including such a purification unit 1 includes a generator 11, a water tank 12, and a blending device 13, and electric power from the generator 11 passes through a distribution board 14. The pump is supplied to the submersible pump 121, the blending device 13, the infusion pump 14 described later, and the like. Moreover, the water in the water tank 12 is supplied to the blending device 13 via the submersible pump 121, and a predetermined purifier C is blended and generated. On the other hand, a plurality of purification units 1 are prepared according to the area of the soil G that requires purification, the working environment / conditions, and the like, and an injection pump 14 and a cylinder 15 are prepared for each purification unit 1. Here, the compressed air A is supplied to each cylinder 15 from a compressor (not shown).

  Further, the suction port side of each infusion pump 14 is connected to the preparation device 13 via a suction hose 131, and the discharge port side of each infusion pump 14 is connected to the purification unit 1 via a discharge hose 132. It has become. Furthermore, a flow meter 161 is attached to each suction hose 131 so that the flow rate of the purification agent C with respect to each purification unit 1 can be confirmed and adjusted. In addition, pressure gauges 162 and 163 are attached to the discharge port side of each infusion pump 14 and each purification unit 1, respectively, and the pressure difference between the discharge port side of the injection pump 14 and the purification unit 1 is known, The injection / penetration state of the cleaning agent C can be estimated and confirmed.

  Next, the action of the purification unit 1 and the soil purification equipment 10 having such a configuration and the soil purification method will be described. Here, it is assumed that the soil parts G1 to G2 in FIG. 1 are contaminated soil and the purifier C is infiltrated into the parts G1 to G2.

  First, as shown in FIG. 9, the casing 5 is driven into the soil G as described above with the screen 4, the air packer 3 and the inner rod 2 accommodated (step S1). At this time, while sequentially connecting the inner rod 2 and the casing 5, the purification unit 1 is driven by the driving machine 17 to a desired depth, that is, until the screen 4 reaches the soil site G1. Subsequently, as described above, only the casing 5 is pulled out from the soil G by the driving machine 17, and the screen 4, the air packer 3, and the inner rod 2 are embedded in the soil G (step S2). Such driving and extraction (steps S1 and S2) are performed on each purification unit 1. That is, the cleaning agent C can be injected into the soil G requiring purification at a plurality of locations at the same time. At this time, the cleaning interval of the purification unit 1 is determined based on the contamination state of the soil G, the necessary degree of purification, the permeability of the purification agent C to the soil G, and the like. ) Is set so that the purifier C penetrates evenly and reliably.

  Next, after connecting the air hose 151 of the cylinder 15 to the air pipe connection portion 61 of each purification unit 1, connecting the discharge hose 132 to the purification agent pipe connection portion 62, and supplying the compressed air A from the cylinder 15, The injection pump 14 is activated to supply the cleaning agent C (step S3). Thereby, the compressed air A flows into the air packer 3 through the inner rod 2 as described above, and the rubber tube 31 expands. In this state, the cleaning agent C flows into the screen 4 through the inner rod 2 and the air packer 3, and the cleaning agent C is discharged and ejected from the screen 4 toward the soil G.

  Here, by pulling out the casing 5, as shown in FIG. 10, there is a gap between the driving hole Ga by the casing 5 and the screen 4, but the soil G above the screen 4, that is, around the air packer 3. In the soil G, the pressure is received by the expansion of the rubber tube 31, and the density increases. For example, a crack formed by driving is blocked or reduced. In this state, the cleaning agent C is released from the screen 4, so that the penetration of the cleaning agent C into the air packer 3 is suppressed, and the cleaning agent C further permeates around the screen 4. Here, the injection amount of the purification agent C is set according to the contamination state and properties of the soil C, and is injected while checking the flow meter 161 and the pressure gauges 162 and 163 of each purification unit 1 to obtain an appropriate amount. Can be penetrated reliably and properly.

  Then, after injecting a predetermined amount of the purifying agent C, the supply of the compressed air A and the purifying agent C is stopped, and the screen 4, the air packer 3 and the inner rod 2 are pulled up to a predetermined height with the air packer 3 contracted. (Step S4). That is, since the cleaning agent C has permeated around the screen 4 in step S3, the screen 4 is pulled up by the length of the screen 4. At this time, the inner rod 2 is gripped and lifted by the lifting jack 182 driven by the hydraulic unit 181 and the pulled inner rod 2 is removed.

  Subsequently, in the same manner as in step S3, the purifier C is discharged and ejected from the screen 4 to the soil G in a state where the compressed air A is supplied and the air packer 3 is expanded (step S5). Thus, the position change of the screen 4 and the release of the cleaning agent C (steps S4 and S5) are repeated, and the cleaning agent C is injected into the entire soil region G1 to G2. Further, the above steps S1 to S5 are repeated until the injection is completed on the entire surface of the soil G requiring purification.

  As described above, according to the purification unit 1, the soil purification equipment 10, and the soil purification method, the purification agent C penetrates further around the screen 4, so that the site of the soil C to be purified is appropriately and evenly purified. It becomes possible for the agent C to permeate. In other words, since the purifier C is prevented from penetrating above the screen 4 and the place of the purifier C is restricted to the periphery of the screen 4, the purifier C surely penetrates the soil G around the screen 4. It becomes possible to make it. And by repeating such injection | pouring, it becomes possible to permeate | purify the purification | cleaning agent C appropriately and uniformly in the whole region of desired soil site | parts G1-G2. As a result, for example, even in the soil G having a high viscosity, the purifier C can be permeated into a desired portion.

(Embodiment 2)
FIG. 11 is a schematic configuration diagram showing the purification unit 100 according to this embodiment, and components that can be regarded as equivalent to those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. This embodiment differs from the first embodiment mainly in that a tip air packer (second expansion / contraction tube) 7 is attached to the downstream side of the screen 4.

  As shown in FIG. 12, the air packer 3 has a first relay pipe 37 and a second relay pipe 38 connected to the free ends of the fixtures 32 and 33. A third relay pipe 39 is attached to the. The gap 38a between the second relay pipe 38 and the third relay pipe 39, the purifier flow hole 39a formed in the third relay pipe 39 and the first relay pipe 37, and the packer inner pipe 34 Are communicated, and the purifier C circulates through these. Further, the air circulation hole 39b formed in the third relay pipe 39 and the air circulation hole 37a formed in the first relay pipe 37 communicate with the gap 3a, and the compressed air A circulates through these. It is like that. The upstream second relay pipe 38 is formed with a female screw (packer female thread 32a), and the downstream second relay pipe 38 is formed with a male screw.

  The screen 4 has the same configuration as the inner rod 2 of the first embodiment. As shown in FIG. 13, the space between the outer tube 41 and the inner tube 42 is a first flow path through which the purifier C flows. 4a, the inside of the inner pipe 42 is a second flow passage 4b through which the compressed air A flows. Further, a plurality of discharge holes 41 a for discharging the purifier C to the outside are formed on the side surface of the outer tube 41, and a female screw for connecting to the air packer 3 is formed at the upstream end of the outer tube 41. A male screw for connecting to the tip air packer 7 is formed at the downstream end.

  As shown in FIG. 14, the tip air packer 7 includes a rubber tube 71 that expands upon receiving compressed air A, as in the air packer 3, and fixing tools 72 and 73 are attached to both ends thereof. 73, the packer inner tube 74 is disposed concentrically in the rubber tube 71. A gap 7 a is formed between the rubber pipe 71 and the packer inner pipe 74 in a state where the compressed air A is not supplied. In addition, a first relay pipe 75 and a second relay pipe 76 are connected to the end of the upstream fixture 72, and a third relay pipe 77 is provided in the relay pipes 75 and 76. It is installed.

  The compressed air A from the screen 4 flows into the gap 7 a through the air circulation hole 77 a formed in the third relay pipe 77 and the air circulation hole 75 a formed in the first relay pipe 75. The rubber tube 71 is configured to expand. Further, the purifier C from the screen 4 hits the end surface of the third relay pipe 77 and stays there. On the other hand, a tip cone 78 equivalent to the tip cone 43 of the first embodiment is attached to the end of the downstream fixing tool 73. The second relay pipe 76 is formed with a female screw for connecting to the screen 4.

  When such a purification unit 100 is used to infiltrate the purification agent C into the soil G, as shown in FIG. 15, the purification unit 100 is driven (step S1) and the casing 5 Pulling out (step S2), injecting the cleaning agent C (step S3), lifting the screen 4 and the like (step S4), and injecting the cleaning agent C (step S5).

  When the purifier C is injected in steps S3 and S5, the air packer 3 and the tip air packer 7 are expanded by the compressed air A, and the pressure is applied to the soil G located above and below the screen 4, The cleaning agent C is released from the screen 4. For this reason, the purifier C is prevented from penetrating in the vertical direction of the screen 4, and the purifier C further penetrates around the screen 4.

  As described above, according to this embodiment, the permeation / diffusion of the purifier C to the upper and lower sides of the screen 4 is suppressed, and the purifier C permeates only around the screen 4 more. As a result, it becomes possible to more appropriately and evenly infiltrate the purifier C only to the part of the soil G to be purified. For this reason, for example, in the soil G having high viscosity and low water permeability, cracks are likely to occur due to the driving of the purification unit 100, but even in such soil G, the purification agent for cracks on the upper and lower sides of the screen 4. The intrusion of C is suppressed, and the purifier C can be infiltrated only into a desired site. Thus, it can be said that this embodiment is more suitable for the soil G having a higher viscosity than the first embodiment. Furthermore, since it is possible to infiltrate the purification agent C at a pinpoint, the amount of the purification agent C injected is optimized (reduced), and the diffusion of the purification agent C to the soil G that does not require purification is prevented. Can do.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the first embodiment, the slide piece 35 of the air packer 3 slides so that the compressed air A flows into the gap 3a and the purifier C flows into the packer inner pipe 34. In this fixing tool 32, a flow path for guiding the compressed air A to the gap 3a and a flow path for guiding the purifier C to the packer inner pipe 34 may be provided. In the second embodiment, the compressed air A is sent from the inner rod 2 to the tip air packer 7 via the air packer 3 and the screen 4, but the inner rod 2 and the tip air packer 7 are directly connected to each other. May be sent. Further, the inner rod 2 may be partitioned along the axial direction to form a first flow path and a second flow path, or nitrogen or water other than the compressed air A may be used as the expansion fluid. May be.

1,100 Purification unit (soil purification device)
2 Inner rod (distribution pipe)
2a 1st flow path 2b 2nd flow path 3 Air packer (expansion / contraction pipe)
4 screen (discharge tube)
5 Casing (container tube)
7 Tip air packer (second expansion / contraction tube)
10 Soil purification equipment G Soil C Cleaner A Compressed air (expansion fluid)

In order to achieve the above object, the invention described in claim 1 is a soil purification apparatus for infiltrating a purification agent into contaminated soil, and is tubular and has a first flow passage through which the purification agent flows and expansion. A second flow path through which the working fluid flows is provided in the pipe, and is provided on the downstream side of the flow pipe, and is expanded by the expansion fluid flowing in from the second flow path of the flow pipe. An expansion / contraction tube, a discharge tube that is provided on the downstream side of the expansion / contraction tube and discharges the purifier flowing in from the first flow passage of the flow tube to the outside, and has a tubular shape, the discharge tube and the expansion / contraction tube, and characterized in that it comprises a pull disconnect Charles accommodating tube from the soil leaving the soil to a write rare the discharge tube and the inflation and deflation tube out into the soil and the distribution pipe by driving tool in a state in which the flow tube is accommodated in the tube To do.

Invention of Claim 3 is the soil purification method using the soil purification apparatus of Claim 1, Comprising: In the state which accommodated the said discharge pipe, the expansion / contraction pipe | tube, and the distribution pipe in the said storage pipe, The discharge tube side is directed to the soil, the storage tube is driven into the soil by a driving machine , the storage tube is pulled out of the soil, the discharge tube, the expansion / contraction tube, and the distribution tube are embedded in the soil, In the state where the expansion fluid is supplied to the two flow passages and the expansion / contraction tube is expanded, the purification agent is supplied to the first flow passage of the flow pipe, and the purification agent is supplied to the soil from the discharge pipe. It is made to discharge | release.

In order to achieve the above object, the invention described in claim 1 is a soil purification apparatus for infiltrating a purification agent into contaminated soil, and is tubular and has a first flow passage through which the purification agent flows and expansion. A second flow path through which the working fluid flows is provided in the pipe, and is provided on the downstream side of the flow pipe, and is expanded by the expansion fluid flowing in from the second flow path of the flow pipe. An expansion / contraction tube that applies pressure to the soil, a discharge tube that is provided on the downstream side of the expansion / contraction tube and discharges the purifier flowing in from the first flow passage of the flow tube, and a tubular shape, The discharge pipe, expansion / contraction pipe, and distribution pipe are connected to each other and housed in the pipe, and are driven into the soil by a driving machine, and the discharge pipe, expansion / contraction pipe, and distribution pipe are left in the soil and pulled out from the soil. comprising a housing tube, the length of the discharge tube after withdrawal of the housing pipe Wherein with circulation pipe and deflating tube is set to the raising height of the case to discharge repeatedly the cleaning agent to raise predetermined height, it is characterized.

Invention of Claim 3 is the soil purification method which uses the soil purification apparatus of Claim 1, Comprising: The said discharge pipe, the expansion / contraction pipe | tube, and the distribution | circulation pipe | tube were connected , respectively, and it accommodated in the said storage pipe In the state, the discharge tube side is directed to the soil, the storage tube is driven into the soil by a driving machine, the storage tube is pulled out from the soil, and the discharge tube, the expansion / contraction tube and the distribution tube are embedded in the soil, In a state where the expansion fluid is supplied to the second flow passage of the flow pipe to expand the expansion / contraction pipe and pressure is applied to the soil , a purifier is supplied to the first flow passage of the flow pipe, wherein together to release the cleaning agent into the soil from the discharge pipe, after injecting a predetermined amount of cleaning agent, the stops supplying the inflation fluid and cleaning agents, in a state where the deflating tube deflated, the release Pull up the tube, the expansion / contraction tube and the flow tube to a predetermined height, and then expand the expansion / contraction tube again. The cleaning agent is injected, injecting the purifying agent into soil entire repeat and injected with the pulling, it is characterized by Te.

According to the invention described in claims 1 and 3, in a state where the discharge pipe, the expansion / contraction pipe, and the flow pipe are embedded in the soil, the discharge pipe is located at the deepest position, that is, the site where the purifying agent is to penetrate, The expansion / contraction tube is located above the tube. Then, by expanding the expansion / contraction tube, the surrounding soil is subjected to pressure to increase the density (for example, the crack formed by driving is closed), and the purifier is released from the discharge tube in this state. Therefore, the penetration of the purifier into the expansion / contraction tube side is suppressed. For this reason, it becomes possible for the purifier to penetrate more into the periphery of the discharge pipe, and to permeate the purifier evenly and appropriately into the soil site to be purified. Further , since the purifying agent is released from the discharge pipe in a state in which the purifying agent is prevented from penetrating above the discharge pipe, that is, the place of the purifier is restricted around the discharge pipe. Furthermore, it becomes possible to permeate | purify a purification agent appropriately and equally in the whole region of a desired soil site | part by repeating raising and injection | pouring. As a result, for example, even if the soil is highly viscous, it is possible to allow the purifier to penetrate into a desired site.

Claims (3)

A soil purification device for infiltrating a cleansing agent into contaminated soil,
A tubular flow pipe having a first flow path through which the purifying agent flows and a second flow path through which the expansion fluid flows;
An expansion / contraction pipe provided on the downstream side of the flow pipe and inflated by the expansion fluid flowing in from the second flow passage of the flow pipe;
A discharge pipe that is provided on the downstream side of the expansion / contraction pipe and discharges the purifier flowing in from the first flow passage of the flow pipe to the outside;
Tubular, can be driven into the soil with the discharge tube, expansion / contraction tube and flow tube accommodated in the tube, and can be pulled out from the soil leaving the discharge tube, expansion / contraction tube and flow tube in the soil A containment tube;
A soil purification apparatus comprising: A second expansion / contraction tube provided on the downstream side of the discharge tube and inflated by the expansion fluid flowing in from the second flow path of the flow tube;
The soil purification apparatus of Claim 1 characterized by the above-mentioned. A soil purification method using the soil purification apparatus according to claim 1,
In a state where the discharge pipe, expansion / contraction pipe and flow pipe are housed in the storage pipe, the discharge pipe is driven into the soil with the discharge pipe side facing the soil, the storage pipe is pulled out of the soil, and the discharge pipe And the expansion / contraction tube and the distribution tube are buried in the soil,
In a state where the expansion fluid is supplied to the second flow passage of the flow pipe and the expansion / contraction pipe is expanded, the purifier is supplied to the first flow passage of the flow pipe, and the soil is discharged from the discharge pipe. To release the cleaning agent,
A soil purification method characterized by that.

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