JPH08108169A - Method for sucking soil pollutant and suction apparatus using the same - Google Patents

Abstract

PURPOSE: To suck mainly pollutants by one suction pipe by inserting an insertion pipe with holes bored into a well, inserting a suction pipe into the insertion pipe, sealing the gap between the two pipes by enlarging the diameters of seal mechanisms of the suction pipe corresponding to the position of a polluted stratum, and sucking the pollutants by the suction pipe. CONSTITUTION: A suction pipe 24 is inserted into an insertion pipe 14 having holes 12 in the whole circumferential surface which is inserted into a well 10 dug in a polluted area. Two sealing mechanisms 20a, 20b are attached to the suction pipe 24 at a specified distance between them, and suction holes 22 are bored in the circumferential surface between the sealing mechanisms 20a, 20b. The gap between the insertion pipe 14 and the suction pipe 24 is sealed by enlarging the diameters of the sealing mechanisms 20a, 20b at positions where concrete layers 16b, 16c are formed, so that a space 26 with its upper and lower faces sealed is formed between the sealing mechanisms 20a, 20b. The gas, etc., in the space 26 are sucked through the suction holes 22 and the suction pipe 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for sucking soil pollutants, and more specifically to a method and apparatus for sucking soil pollutants from a predetermined depth of a well dug in a polluted area. Regarding the suction device.

[0002]

2. Description of the Related Art When removing soil pollutants from soil or groundwater contaminated by volatile organic solvents such as trichlorethylene and tetrachloroethylene or water-soluble substances such as hexavalent chromium, a proposal is made in Japanese Patent Laid-Open No. 3-202586. As described above, a method of sucking and removing the pollutants from the well dug in the polluted area is adopted. However, in the stratum, there are stratums in which pollutants are likely to stay and stratums in which pollutants are difficult to accumulate.
Air or gas may selectively escape from the formation in which air or gas easily escapes, and suction from the formation in which pollutants are retained may be substantially impossible. For this reason,
As shown in FIG. 7, the method proposed in Japanese Patent Laid-Open No. 231086 inserts a plurality of suction pipes 104, 106 having different insertion depths into a well 102 dug in a contaminated region, The tips are filled with sand or crushed stone to form layers 108 and 110 into which gas and water enter. Furthermore, concrete layers 112, 1 are provided on the upper and lower surfaces of the layers 108, 110.
14 and 116 to form gas and water from other layers
It's difficult to enter 8,110.

[0003]

According to the method shown in FIG. 7, it is possible to remove the pollutants from the formation in which the pollutants are accumulated in a focused manner. However, as shown in FIG. 7, it is necessary to insert a plurality of suction pipes 104 and 106 into the well 102, and therefore it is necessary to dig a large diameter well. Therefore, when it is necessary to dig a large-diameter deep well that is difficult to dig, a plurality of wells having different depths are dug for each stratum in which pollutants are accumulated. Also, the suction tube 1
In the middle of 04 and 106, concrete layers 112 and 114
Since it is fixed to the suction pipes, the suction pipes 104 and 106 cannot be extracted and are left after the suction and removal of the contaminants are completed. As described above, in the conventional soil pollutant removal method, the work procedure is complicated and the work scale is large, so that the pollutant removal cost is high. Therefore, it is an object of the present invention to provide a method and apparatus for sucking soil pollutants, which can remove pollutants from a stratum in which pollutants are retained by a single suction pipe.

[0004]

Means for Solving the Problems As a result of a study to achieve the above-mentioned object, the present inventor has found that the diameter of a tube can be increased or decreased in an insertion tube having a plurality of holes inserted in a well. Two sealing mechanisms each having a sealing member provided in the are installed at a predetermined interval, and contaminants accumulate in the suction pipe having suction holes formed in the outer peripheral surface between the sealing mechanisms. After inserting into the position corresponding to the stratum, expanding the diameter of the sealing member of the sealing mechanism, and contacting the inner wall surface of the insertion tube with the outer peripheral surface of the sealing member to seal between the insertion tube and the suction tube, The inventors have found that by sucking the inside of the gap formed between the sealing mechanisms, the pollutants can be sucked into the gap from the formation in which the pollutants are retained, and have reached the present invention.

That is, according to the present invention, when a contaminant is sucked from a predetermined depth of a well dug in a contaminated area, the contaminant is expanded into an insertion pipe having a plurality of holes inserted therein. A sealing mechanism including a sealing member provided so that the diameter and the diameter can be reduced is attached, and after inserting a suction tube having a suction hole in the outer peripheral surface above or below the sealing mechanism,
The seal member of the seal mechanism is expanded in diameter so that at least a part of the outer peripheral surface of the seal member is brought into circumferential contact with the inner wall surface of the insert tube to seal between the insert tube and the suction tube, and then the seal mechanism and suction The gas and water in the gap are sucked from the suction hole of the suction pipe so that the pollutants are sucked from the contaminated soil through the hole of the insertion pipe into the gap surrounded by the pipe and the suction pipe. It is a characteristic method for inhaling soil pollutants.

The present invention is also a soil pollutant suction device for sucking pollutants that have entered the insertion tube through a plurality of holes formed in the insertion tube inserted into the well of the polluted region. A suction pipe inserted into the insertion pipe and having a suction hole formed in the outer peripheral surface thereof over a predetermined width in the vertical direction, and a suction pipe formed in the suction pipe near a boundary above or below the suction hole. A seal mechanism to be mounted, and when the seal mechanism is inserted together with the suction tube and expanded in diameter in the insertion tube, at least a part of the outer peripheral surface of the insertion tube is in contact with the inner wall surface of the insertion tube. A suction device for soil pollutants is provided with a seal member capable of expanding and contracting the diameter so as to seal between the suction pipe and the suction pipe.

In the present invention having such a structure, a suction pipe is used in which at least two seal mechanisms are mounted with a predetermined gap and a suction hole is formed in the outer peripheral surface between the seal mechanisms. By doing so, when the contaminated strata include three or more layers, the pollutants can be sucked for each contaminated stratum. Further, as the seal member, a rubber seal member sandwiched between a fixed flange positioned at a predetermined position of the suction pipe and a movable flange provided so as to be vertically movable along the outer peripheral surface of the suction pipe is used as the seal member. By using the seal mechanism to adjust the distance between the fixed flange and the movable flange, the rubber seal member can be expanded or reduced in diameter, or along the outer peripheral surface of a predetermined portion of the suction pipe. By using a sealing mechanism that uses the provided donut-shaped rubber hollow body as a seal member, fluid is allowed to enter and leave the rubber hollow body, and the rubber hollow body is expanded and reduced in diameter to be inserted. The gap between the tube and the suction tube can be easily sealed. The "seal" referred to in the present invention means sealing between the inner wall surface of the insertion tube and the outer peripheral surface of the suction tube.

[0008]

According to the present invention, the suction pipe is inserted into the insertion pipe having a plurality of holes inserted into the well, and the position of the insertion pipe corresponding to the contaminated stratum in which contaminants are retained. In the above, by enlarging the diameter of the seal member of the seal mechanism mounted at an arbitrary position of the suction pipe to seal the space between the insertion pipe and the suction pipe, it is surrounded by the seal mechanism, the suction pipe, and the suction pipe. A gap can be formed. Then, the gas or water in the gap can be sucked through the suction hole of the suction pipe to reduce the pressure inside the gap, so that the pollutants can be sucked into the gap from the contaminated formation. The pollutant thus sucked into the gap can be sucked to the ground via the suction pipe. Therefore, according to the present invention, one suction pipe that can be inserted and removed is used in the insertion pipe inserted in the dug well, and the pollutant can be sucked from a predetermined contaminated stratum in a focused manner. is there.

[0009]

The present invention will be described in detail with reference to the drawings. In FIG. 1, an insertion pipe 14 having holes 12, 12, ... Perforated over substantially the entire outer peripheral surface is inserted into a well 10 dug in a contaminated region. Between the inner wall surface of the well 10 and the outer peripheral surface of the insertion tube 12, concrete layers 16a to 16d are provided so as to divide a contaminated stratum in which contaminants are retained, and sandwiched by the concrete layers 16a to 16d. Since the part corresponds to the contaminated stratum, the layer 1 filled with sand or crushed stone so that the pollutants can pass through.
8a to 18c. In this embodiment, the insertion tube 14
Two sealing mechanisms 20a and 20b are mounted on the outer peripheral surface of the sealing mechanism 20 at predetermined intervals.
A suction tube 24 having a plurality of suction holes 22 is inserted in the outer peripheral surface between a and 20b. This sealing mechanism 20a,
Each of the 20b seals between the insertion tube 14 and the suction tube 24 at the position where the concrete layers 16b and 16c are formed, and forms a gap 26 whose upper and lower surfaces are sealed between the sealing mechanisms 20a and 20b.

The gas and water in the gap 26 are sucked into the suction pipe 2.
It is sucked by the suction holes 22 of No. 4 and the inside of the gap 26 can be depressurized. Therefore, the pollutants in the contaminated formation are sucked into the gap 26 via the hole 18 of the insertion tube 14 via the layer 18b and from the suction hole 22 to the ground via the suction pipe 24. At this time, gas and water in formations other than the contaminated formation that is sucking the pollutants can enter the gap 26 because they are sealed by the concrete layers 16b and 16c and the sealing mechanisms 20a and 20b. Instead, the contaminants in a specific contaminated stratum can be removed by suction. The gas and water sucked into the suction pipe 24 in this way are
It is processed by the processing facility shown in FIG. 1 installed on the ground. That is, the gas or water sucked into the suction pipe 24 is
The gas separated from the water from the above-ground end portion into the steam separation tank 32 via the pressure gauge 28 and the adjusting valve 30 passes through the suction gas processing tank 34 filled with an adsorbent such as activated carbon to contaminate it. After the substance is removed, the purified air is sucked by the suction pump 36 and released into the atmosphere. The suction pump 36 depressurizes the system including the suction pipe 24. On the other hand, the water separated from the gas passes through a water treatment tank 40 filled with an adsorbent such as activated carbon by a pump 38, and then is discharged into a sewer or the like. The valve 42 is a measurement valve and can collect a sample for analyzing a component such as gas sucked from the suction pipe 24.

As shown in FIG. 2, the suction pipe 24 shown in FIG. 1 is provided with seal mechanisms 20a and 20b at predetermined intervals. Each of the sealing mechanisms 20a and 20b is provided with a rubber sealing member as a sealing member that can be expanded and contracted. This sealing mechanism 20a, 20b
3 shows a partial cross-sectional view of the seal mechanism 20a mounted on the upper side. The hollow rotating shaft 50 forming the sealing mechanism 20a shown in FIG. 3 forms a part of the suction pipe 24. That is, the upper suction tube 24a and the upper end of the rotary shaft 50 are connected by the coupling 52, and
The lower suction tube 24b having the suction holes 22, 22 ...
Also, the coupling 5 formed at the lower end of the rotary shaft 50
This is because they are connected by 4. This rotating shaft 50
Is formed in the vicinity of the coupling 54 of
One end of each of the leaf springs 69, 69 bent in a V shape is screwed with a nut 58 fixed to the outer peripheral surface. As shown in FIG. 3, the diameter of the coupling 54 is larger than the diameter of the threaded portion 56 of the rotary shaft 50, so that the nut 58 is prevented from rotating. Further, rubber seal members 64 and 66 having a V-shaped cross-section are superposed through the flange 68 and mounted between the flanges 60 and 62, one surface of which is in contact with the respective end surfaces of the coupling 52 and the nut 58. Has been done.

Further, the seal mechanism 20 mounted on the lower side
A partial cross-sectional view of b is shown in FIG. The structure of the seal mechanism 20b is also substantially the same as that of the seal mechanism 20a. That is,
The hollow rotary shaft 70 is formed by the suction pipe 24b having the suction holes 22, 22, ... And the coupling 72, and forms a part of the suction pipe 24. However, the lower end opening of the suction pipe 24 is the coupling 7 formed at the lower end of the rotary shaft 70.
It is blocked by 4. A screw portion 76 is formed in the vicinity of the coupling 74 of the rotary shaft 70, and one end of a leaf spring 79, 79 bent in a V-shape is screwed into a nut 78 fixed to the outer peripheral surface. There is. The diameter of the coupling 74 is, as shown in FIG.
Since it is larger than the diameter of 6, it serves as a detent for the nut 78. Further, between the flanges 80 and 82, one surface of which is in contact with the respective end surfaces of the coupling 74 and the nut 78,
The rubber seal members 84 and 86 having a V-shaped cross section are the flange 8
It is attached by being superposed through 8.

The operation of the seal mechanisms 20a and 20b thus mounted on the suction tube 24 will be described with reference to FIGS. 5A and 5B show a sealing mechanism 20b attached to the lower end of the suction tube 24b inserted into the insertion tube 14.
However, the operation of the seal mechanism 20a attached to the upper end of the suction tube 24b is also the same. Insertion tube 14
In the seal mechanism 20b inserted in the above, a part of the leaf springs 79, 79 provided in the nut 78 contacts the inner wall surface of the insertion tube 14. However, the seal mechanism 20b can be set to a desired depth by pushing the suction tube 24 with a force that opposes the frictional force between the leaf springs 79, 79 and the inner wall surface of the insertion tube 14. When the force for pushing the suction tube 24 is removed, as shown in FIG.
As shown in (a), the nut 78 is positioned by the frictional force between the leaf springs 79, 79 and the inner wall surface of the insertion tube 14. In this state, as shown in FIG. 5A, the outer diameters of the rubber seal members 84 and 86 having the V-shaped cross section are smaller than the inner diameter of the insertion tube 14.

Next, when the suction tube 24a is rotated in a fixed direction, the suction tube 24b also rotates in the same direction via the seal mechanism 20a attached to the lower end of the suction tube 24a. Therefore, when the suction pipe 24a is rotated so that the suction pipe 24b rotates in the direction of arrow A in FIG. 5A, the nut 78 is not substantially rotated by the leaf springs 79 and 79 and is kept at a constant position. Because of the leaning, the rotary shaft 70 (FIG. 4) on which the screw portion 76 that meshes with the nut 78 is formed and the suction pipe 24b move downward while rotating. Therefore, the flange 82 whose one surface abuts on the end surface of the nut 78 is a fixed flange which holds a fixed position, and the flange 80 whose one surface abuts on the end surface of the coupling 72 is a movable flange which moves downward together with the coupling 72. is there. The flange 88 sandwiched between the rubber seal members 84 and 86 having a V-shaped cross section is also a movable flange that moves together with the rubber seal members 84 and 86.

A rubber seal member 84, 8 having a V-shaped cross section, which is sandwiched between the flange 82 and the flange 80 as described above.
In No. 6, as the gap between the flange 82 and the flange 80 becomes narrower, it is gradually compressed, the V-shape disappears, and the outer diameter increases. For this reason, as shown in FIG. 5B, the outer peripheral surfaces of the rubber seal members 84 and 86 are in circumferential contact with the inner wall surface of the insertion tube 14 and can seal between the suction tube 24 and the inner wall surface of the insertion tube 14. . Further, the outer diameters of the rubber seal members 64 and 66 of the seal mechanism 20a attached to the upper end of the suction pipe 24b are also
The rubber seal members 84 and 86 of the seal mechanism 20b are expanded at the same time as the outer diameters of the rubber seal members 84 and 86 are expanded.
The outer peripheral surface of the inner peripheral surface makes circumferential contact with the inner wall surface of the insertion tube 14 and seals between the suction tube 24 and the inner wall surface of the insertion tube 14. As a result, a gap 26 whose upper and lower surfaces are sealed can be formed between the seal mechanism 20a and the seal mechanism 20b (FIG. 1).

On the other hand, the release of the sealed state by the rubber seal members 84 and 86 shown in FIG. 5 (b) can be performed by rotating the suction pipe 24 in the direction of arrow B shown in FIG. 5 (b). That is, when the suction pipe 24 is rotated in the direction of the arrow B, the rotation shaft 70 having the screw portion 76 that meshes with the nut 78 and the suction pipe 24b move upward while rotating. Therefore, the gap between the flange 82 and the flange 80 is widened, the V-shaped shapes of the rubber seal members 84 and 86 are gradually recovered, and the outer diameter is reduced, and the outer surfaces of the rubber seal members 84 and 86 are reduced. The circumferential contact state with the inner wall surface of the insertion tube 14 can be eliminated. In the state shown in FIG. 5A, the leaf springs 69, 6 of the seal mechanism 20a and the seal mechanism 20b are
The suction tube 24 is moved up and down by a force that resists the frictional force between the inner wall surface of the insertion tube 14 and the inner wall surface of the insertion tube 14.
The suction tube 24 can be moved to an arbitrary position within 4. In order to ensure the positioning of the nuts 58, 78, the insertion pipe 14 is a vinyl chloride pipe or a steel pipe so as to increase the frictional force between the leaf springs 69, 69, 79, 79 and the inner wall surface of the insertion pipe 14. And / or leaf springs 69, 69, 79,
On the inner wall surface of the insertion tube 14 that abuts against a portion of 79, a means for increasing the frictional force between the two, such as a recess or a dent, may be provided along the longitudinal direction.

The seal member of the seal mechanism shown in FIGS. 2 to 5 is a rubber seal member having a V-shaped cross section, but as shown in FIG. 6, a donut-shaped rubber hollow body 90a is used as the seal member. 90b can be used. In FIG. 6, each of the donut-shaped rubber hollow bodies 90 a and 90 b is inserted into concave grooves 94 and 94 formed at a predetermined interval on the circumferential surface of the suction pipe 24, and is mutually connected by an air supply pipe 92. Are linked to. Therefore, the rubber hollow body 90
If the suction tube 24 is inserted into the insertion tube 14 without supplying air to a and 90b, the suction tube 24 can be moved to an arbitrary position.

Next, when air is supplied to the rubber hollow bodies 90a and 90b inserted to a predetermined depth through the air supply pipe 92, the rubber hollow bodies 90a and 90b are expanded and expanded in diameter, so that the rubber hollow bodies 90a and 90b are expanded. A part of the peripheral surfaces of the bodies 90a and 90b are in circumferential contact with the inner wall surface of the insertion tube 14 so that the suction tube 24 and the inner wall surface of the insertion tube 14 can be sealed. As a result, a gap 26 whose upper and lower surfaces are sealed can be formed between the rubber hollow bodies 90a and 90b (FIG. 1). On the other hand, rubber hollow body 9
When releasing the sealed state of the rubber hollow bodies 0a and 90b, the rubber hollow bodies 90a and 90b can be reduced in diameter by discharging the air in the rubber hollow bodies 90a and 90b through the supply pipe 92. The sealed state can be easily released.

In the above-mentioned embodiment, the removal of soil pollutants has been described, but it can also be used for measuring the soil pollution state such as the concentration distribution of soil pollutants. In this case, the treatment equipment for treating water and gas shown in FIG. 1 is not necessary, and the measurement valve 42 for collecting the sample of water or gas sucked into the suction pipe 24.
Should be provided. Further, in the present embodiment, the suction pipe 24 is provided with the seal mechanisms 20a and 20b, but the suction pipe 24 may be provided with one seal mechanism. For example, in FIG. 1, the concrete layer 16
When suction of the lower stratum separated by the concrete layer 16c and the concrete layer 16d is performed after the suction of the intermediate stratum separated by b and the concrete layer 16c is completed, only the sealing mechanism 20a is attached to the suction pipe. By mounting and sealing the portion corresponding to the concrete layer 16c, it is possible to suction the lower stratum while preventing the inflow of fluid such as air or water from the upper stratum including the intermediate stratum that has completed suction.

[0020]

According to the present invention, in a well dug in a polluted area, a single suction pipe can sequentially suck and remove soil pollutants from the stratum in which soil pollutants are accumulated at the highest concentration. As compared with the case of digging a well of a book or the case of using a plurality of suction tubes, the removal of soil pollutants and the measurement of soil pollution can be performed efficiently and at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a schematic front view of the suction tube used in FIG.

FIG. 3 is a partial cross-sectional view illustrating the structure of one seal mechanism used in the suction tube shown in FIG.

FIG. 4 is a partial cross-sectional view illustrating the structure of another sealing mechanism used in the suction tube shown in FIG.

5 is an explanatory diagram for explaining the operation of the seal mechanism shown in FIG. 4. FIG.

FIG. 6 is a sectional view illustrating another sealing mechanism.

FIG. 7 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 10 wells 12 holes 14 insertion tubes 20a, 20b sealing mechanism 22 suction holes 24 suction tubes 64, 66, 84, 86 rubber seal members

Claims (8)

[Claims] 1. When a contaminant is sucked from a predetermined depth of a well dug in a contaminated area, a diameter expansion / contraction is performed in an insertion tube having a plurality of holes inserted into the well. A seal mechanism having a seal member that is capable of being installed is attached, and after inserting a suction pipe having a suction hole formed in an outer peripheral surface above or below the seal mechanism, the seal member of the seal mechanism is attached. The inner wall surface of the insertion tube is expanded and at least a part of the outer peripheral surface of the sealing member is circumscribed to seal between the insertion tube and the suction tube, and then surrounded by the sealing mechanism, the suction tube, and the suction tube. Suction of soil pollutant characterized by sucking gas, water, etc. in the gap from the suction hole of the suction pipe so that the pollutant is sucked from the contaminated soil through the hole of the insertion tube into the gap. Method. 2. The suction pipe according to claim 1, wherein at least two sealing mechanisms are mounted with a predetermined gap, and a suction hole is formed in the outer peripheral surface between the sealing mechanisms. Suction method for soil pollutants. 3. A rubber seal member as a seal mechanism, which is sandwiched between a fixed flange positioned at a predetermined position of a suction pipe and a movable flange vertically movable along the outer peripheral surface of the suction pipe. The soil contamination according to claim 1 or 2, wherein a sealing mechanism having a seal member is used to adjust the distance between the fixed flange and the movable flange to expand or reduce the diameter of the rubber seal member. How to aspirate substances. 4. A sealing mechanism, which uses a donut-shaped rubber hollow body provided along the outer peripheral surface of a predetermined portion of the suction tube as a sealing member, is used to apply a fluid to the rubber hollow body. The soil pollutant suction method according to claim 1 or 2, wherein the rubber hollow body is expanded / contracted by moving it in and out. 5. A soil pollutant suction device for sucking pollutants that have entered the insertion tube through a plurality of holes bored in the insertion tube inserted in the well of the polluted region, the insertion apparatus comprising: A suction pipe inserted into the pipe and having a suction hole formed in the outer peripheral surface over a predetermined width in the vertical direction, and a seal attached near the boundary above or below the suction hole formed in the suction pipe. When the seal mechanism is inserted together with the suction tube and expanded in diameter in the insertion tube, at least a part of the outer peripheral surface is in contact with the inner wall surface of the insertion tube so that the insertion tube and the suction tube are connected to each other. A suction device for soil pollutants, which is provided with a seal member capable of expanding and contracting the diameter so as to seal the space. 6. The suction of soil pollutants according to claim 1, wherein at least two seal mechanisms are mounted near respective vertical boundaries of suction holes formed in the suction pipe with a predetermined distance. apparatus. 7. A rubber seal member in which a seal mechanism is sandwiched between a fixed flange positioned at a predetermined position of a suction pipe and a movable flange provided so as to be vertically movable along the outer peripheral surface of the suction pipe. The soil mechanism according to claim 5 or 6, wherein the rubber seal member is expanded / reduced in diameter by adjusting a distance between the fixed flange and the movable flange. Material suction device. 8. The sealing mechanism is a sealing mechanism that uses a donut-shaped rubber hollow body provided along the outer peripheral surface of a predetermined portion of the suction pipe as a sealing member. 7. The rubber hollow body is expanded / reduced in diameter by moving in / out.
Suction device for soil contaminants as described.