WO2003029782A1 - Procede et dispositif non destructifs d'analyse de l'air souterrain, procede non destructif de controle de la contamination des sols et cloison etanche a cet effet - Google Patents

Procede et dispositif non destructifs d'analyse de l'air souterrain, procede non destructif de controle de la contamination des sols et cloison etanche a cet effet Download PDF

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Publication number
WO2003029782A1
WO2003029782A1 PCT/JP2002/009942 JP0209942W WO03029782A1 WO 2003029782 A1 WO2003029782 A1 WO 2003029782A1 JP 0209942 W JP0209942 W JP 0209942W WO 03029782 A1 WO03029782 A1 WO 03029782A1
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WO
WIPO (PCT)
Prior art keywords
pressure
pressure bulkhead
opening
underground air
air
Prior art date
Application number
PCT/JP2002/009942
Other languages
English (en)
Japanese (ja)
Inventor
Yoshikazu Suzuki
Tetsuya Endo
Masayuki Ogawa
Takeshi Manri
Yutaka Kaneko
Original Assignee
Koken Boring Machine Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001297719A external-priority patent/JP3965505B2/ja
Application filed by Koken Boring Machine Co., Ltd. filed Critical Koken Boring Machine Co., Ltd.
Publication of WO2003029782A1 publication Critical patent/WO2003029782A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2294—Sampling soil gases or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/24—Suction devices

Definitions

  • the present invention relates to a nondestructive underground air investigation method, an investigation device, a nondestructive geocontamination purification method, and a pressure bulkhead used for the method. More specifically, a geological layer to be investigated or purified is subjected to boring or the like. And survey methods that do not involve destruction of the in-situ position. Background art
  • VOCs volatile organic compounds
  • the method using underground air suction using a borehole is to collect underground air containing volatile gas etc. from a hole with a small area with a hole diameter of about ⁇ 10 Omm in plan. Also, when a sampling hole is made with a simple driving tool, the sampling area is very small, with a hole diameter of about 10 mm. For this reason,
  • the above conventional technologies require the installation of boreholes and wells, and excavation by hydraulic shovels, etc., and although they are for purification, all technologies involve in situ destruction. For this reason, the in situ cannot be restored to the state before contamination after purification. In addition, drilling and construction using large machines will increase purification costs.
  • the present invention has been made based on the technical background as described above, and achieves the following objects.
  • An object of the present invention is to provide a non-destructive underground air inspection method and method which can omit a high-cost and in-situ destruction process such as boring, and can perform a low-cost, simple and reliable geological pollution inspection at any place. It is to provide a device.
  • Another object of the present invention is that purification can be performed without destruction of the purification site, and the environment of the construction site is not restricted, and installation, movement, and removal of the purification facility are easy.
  • An object of the present invention is to provide a non-destructive method for remediating geological pollution which can reduce the construction cost and a pressure bulkhead used for the method. Disclosure of the invention
  • the present invention provides a pressure partition having an opening, A part facing the ground surface, a method of collecting and investigating underground air in the pressure bulkhead by making the inside of the pressure bulkhead a negative pressure, comprising: It has at least a double structure consisting of an inner pressure bulkhead, and discharges the underground air flowing into the outer space between the outer pressure bulkhead and the inner pressure bulkhead to the outside, and releases the underground air flowing into the inner space inside the inner pressure bulkhead. It is a nondestructive underground air survey method characterized by sampling and surveying.
  • the present invention provides a pressure bulkhead having an opening so that the opening faces the ground surface, and makes the inside of the pressure bulkhead a negative pressure to collect underground air into the pressure bulkhead and investigate.
  • the pressure bulkhead has at least a double structure of an outer pressure bulkhead and an inner pressure bulkhead,
  • Suction means for making the outer space between the outer pressure partition and the inner pressure partition and the inner space in the inner pressure partition a negative pressure, and discharging the underground air flowing into the outer space to the outside;
  • Means for collecting the underground air flowing into the inner space are provided.
  • the suction means is connected to a suction hole provided in the outer pressure partition, and the inner pressure partition has a communication hole communicating the outer space and the inner space.
  • An airtight holding member is provided at the opening of the outer pressure partition to block air from flowing into the outer space.
  • the airtight holding member is a ring-shaped elastic body attached to the opening of the outer pressure partition.
  • the airtight holding member is a tubular body embedded in the ground.
  • the means for collecting the underground air includes: a collection hole provided in each of the outer pressure bulkhead and the inner pressure bulkhead; and a collection pipe which is introduced into the inner space through these collection holes and sucks and collects the underground air. Be prepared. Furthermore, the present invention for achieving the above object provides a method for forming an enclosed space on the surface of a geological layer to be purified,
  • a non-destructive geological pollution purification method wherein the sucked pollutant is sucked and discharged to the outside by the suction device.
  • the closed space can be formed by installing a pressure partition having an opening so that the opening faces the ground surface.
  • Means for blocking the inflow of air into the pressure bulkhead may be provided around the opening.
  • an embankment may be laid around the opening, or the opening may be buried below the ground surface.
  • the present invention also relates to a method for cleaning volatile organic compounds contained in the above-mentioned geological layer, wherein the opening is provided on the surface of the geological layer to be purified so that the opening faces the ground surface, and the internal pressure is reduced.
  • a pressure partition used for purification of geological pollution characterized in that an airtight holding member for blocking inflow of air is provided at an end of the opening.
  • the airtight holding member can be formed of a ring-shaped elastic body that can be deformed according to the shape of the ground surface.
  • the airtight holding member may be formed of a sheet-like elastic body having a widened portion extending around the outer periphery of the opening. Further, the airtightness maintaining member may be constituted by a hard cylindrical body embedded in the geological layer.
  • FIG. 1 is a longitudinal sectional view showing an embodiment of the method and apparatus for investigating underground air according to the present invention
  • FIG. 2 is a longitudinal sectional view showing a state of collecting underground air
  • FIG. FIG. 4 is a diagram showing a process of collecting underground air together with a pressure state in a pressure bulkhead.
  • FIG. 4 is a longitudinal sectional view showing an embodiment of a purification method according to the present invention.
  • FIG. 5 is another embodiment of the purification method.
  • FIG. 6 is a longitudinal sectional view showing still another embodiment of the purification method
  • FIG. 7 is a longitudinal sectional view showing a preferred embodiment of the pressure bulkhead
  • FIG. FIG. 9 is a longitudinal sectional view showing another embodiment of the pressure bulkhead
  • FIG. 9 is a longitudinal sectional view showing still another embodiment of the pressure bulkhead.
  • FIG. 1 shows a nondestructive type underground air inspection device according to the present invention, in which a pressure bulkhead 1 has a double structure of an outer pressure bulkhead 2 and an inner bulkhead 3 disposed inside thereof. Both the outer pressure partition 2 and the inner pressure partition 3 have openings 4 and 5.
  • the outer pressure bulkhead 2 and the inner pressure bulkhead 3 are installed on the ground surface G so that the openings 4 and 5 face the ground surface G.
  • an outer space 7 between the outer pressure bulkhead 2 and the inner pressure bulkhead 3 and an inner space 8 inside the inner pressure bulkhead 3 are formed on the ground surface G, which are hermetically sealed.
  • the opening 4 of the outer pressure bulkhead 2 is provided with an airtight member 9 for blocking the inflow of the atmosphere into the outer space 7.
  • the airtight holding member 9 is a ring-shaped elastic body attached to the entire periphery of the opening 4.
  • the ring-shaped elastic body is made of rubber or a polymer material which closely adheres to the unevenness of the ground surface G and exhibits a sealing function. It is desirable to provide a similar airtight holding member 10 also in the opening 5 of the inner pressure partition 3.
  • a cylindrical body may be provided in the openings 4 and 5 instead of the ring-shaped elastic body as the air-tightness maintaining member, and the cylindrical body may be buried by being pushed to an appropriate depth in the ground. Thus, a sealing function can be exhibited.
  • the outer pressure bulkhead 2 is provided with a suction hole 11, and a suction means 13 such as a vacuum pump is connected to the suction hole 11 via a suction pipe 12.
  • the suction pipe 12 is provided with a pressure gauge 14.
  • the operation of the suction means 13 is controlled by a controller 15 to which the measurement signal of the pressure gauge 14 is inputted. As shown in FIG. 3, the pressure (negative pressure) in the pressure bulkhead 1 and the pressure The retention time can be set arbitrarily.
  • the outer pressure bulkhead 2 is further provided with a sampling hole 16 into which a below-described underground air sampling pipe is inserted, and the sampling hole 16 is closed by a plug 17 when suctioning the underground air.
  • the inner pressure bulkhead 3 is provided with a communication hole 18 for communicating the outer space 7 and the inner space 8. These communication holes 18 also serve as underground air sampling holes.
  • the inner pressure bulkhead 3 and the inner pressure bulkhead 3 are most preferably formed in a thin and lightweight substantially hemispherical shape having excellent buckling strength. Good, but it is also possible to use a cylindrical or square tube.
  • the outer pressure bulkhead 2 and the inner pressure bulkhead 3 are installed on the ground surface G such that the openings 4 and 5 face the ground surface G.
  • the pressure reducing means 13 When the pressure reducing means 13 is operated in this state, the air in the outer space 7 and the inner space 8 communicating with the outer space 7 via the communication hole 18 is sucked, and the pressure in the pressure bulkhead 1 becomes negative pressure. As a result, underground air 20 and 21 flow into the outer space 7 and inner space 8, respectively. I do.
  • the air 23 flows into the outer space 7 from the opening 4 of the outer pressure bulkhead 2 even though it has the airtightness retaining member 9, and the pressure distribution in the pressure barrier 1 ( The negative pressure distribution) is as shown by reference numeral 22. That is, the inflowing air 23 mixes with the underground air 20 flowing into the outer space 7, and such mixed air lowers the accuracy of the measurement. Released outside.
  • the inner pressure bulkhead 3 is set sufficiently smaller than the outer pressure bulkhead 2.
  • the size of the inner pressure bulkhead 3 is set in consideration of the size of the ground to be subjected to geological pollution at the original position and the transportability and handleability. Depending on the size of the suction means 13, for example, the diameter is ⁇ 300. mm or more can be easily achieved.
  • gas sampling pipes 24 are inserted into the sampling holes 17 and 18, and the underground air 21 stored in the inner space 8 is sucked and collected.
  • the gas sampling tube 24 a well-known gas detection tube having a gas suction hole for sucking air (gas) at the tip can be used. As described above in detail, according to the present invention, the following unprecedented excellent effects can be obtained.
  • the inner pressure bulkhead can be easily realized with a diameter of ⁇ 300 mm or more.
  • the sampling area can be more than 900 to 9 times larger than that of the existing borehole with a diameter of about 100 to 100 mm. Therefore, when identifying the source of geological pollution on a vast factory site as “area assessment”, the number of surveyed sites can be significantly reduced compared to the conventional survey method, which is extremely efficient.
  • FIG. 4 is a sectional view showing the same embodiment.
  • the geological stratum 31 shown in Fig. 4 is contaminated with VOCs (indicated by reference numeral 32), and the following treatment is performed on this geological stratum 31 for purification.
  • the pressure bulkhead 33 is a tubular member such as a cylinder or a square tube, and has an opening 34. Inside the pressure bulkhead 33, a suction pipe 38 connected to a suction device 37 such as a vacuum pump is opened.
  • the pressure bulkhead 33 is made of a pressure-resistant material such as a stainless steel plate, but any material may be used as long as it has the pressure resistance. For example, it may be constituted by a resin plate provided with a reinforcing member on the inner circumference or the outer circumference.
  • the shape is not limited to a cylindrical shape, but may be various shapes such as a hemisphere.
  • the pressure bulkhead 33 is installed on the ground surface G of the geological stratum 31 to be purified so that the opening 34 faces the ground surface G. As a result, a closed space 36 is formed on the ground surface G.
  • the suction device 37 By operating the suction device 37, the air inside the pressure bulkhead 33 is sucked, and the internal pressure is made lower (negative pressure) than the atmospheric pressure. As a result, the movement of fluid such as underground air in the geological layer 31 is promoted, and the underground fluid is sucked into the pressure bulkhead 33 as shown by an arrow in FIG.
  • the VOCs 32 contained therein also flow into the inside of the pressure bulkhead 33, where the liquid The VOCs that existed as a volatile gas volatilize, and are discharged to the outside through the suction pipe 38.
  • the concentration of VOCs discharged from the suction device 37 may be measured and monitored by a concentration measuring device (not shown) to manage the progress of the purification process. Further, an adsorption device using activated carbon or the like may be connected to the suction device 37 via a pipe to adsorb VOCs. Note that the above embodiment is based on the premise that VOCs are present in the preliminary survey, but the survey is conducted using the same method as described above, that is, the existence of the VOCs is confirmed using a concentration measurement device. In addition, it is also possible to adopt a procedure in which a purification process is subsequently performed.
  • FIG. 5 and FIG. 6 show an embodiment in which means for blocking the inflow of air into the inside of the pressure barrier 33 is taken. That is, the embodiment shown in FIG. 5 is an example in which an embankment 40 is laid around the opening 34 of the pressure bulkhead 33 as a means for blocking the inflow of air. The embodiment shown in FIG. 6 is an example in which an opening 34 is buried below the ground surface as a means for blocking the inflow of air.
  • FIG. 7 is an example in which a ring-shaped elastic body 41 is provided as an airtight holding member at an end of an opening 34 in a pressure bulkhead 33.
  • the ring-shaped elastic body 41 is a ring having the same shape as the shape of the opening 34, for example, a circular ring or a square ring, and has a predetermined height and a predetermined thickness which is larger than the thickness of the pressure bulkhead 33. (Dimension between the inner and outer diameters).
  • the ring-shaped elastic body 41 is made of, for example, a flexible rubber material.
  • the ring-shaped elastic body 41 is deformed according to the shape of the ground surface G, and the contact area with the ground surface G increases. Therefore, airtightness is maintained between the end surface of the opening 34 and the ground surface G, and the inflow of air can be prevented, so that fluid such as underground air can be effectively sucked.
  • FIG. 8 The embodiment shown in FIG. 8 is an example in which a sheet-like elastic body 42 is provided as an airtight holding member at an end of an opening 34 in a pressure bulkhead 33.
  • the sheet-like elastic body 42 has a widened part 43 spreading around the outer periphery of the opening part 34.
  • the sheet-like elastic body 42 is made of, for example, a flexible rubber material, similarly to the ring-like elastic body 41 shown in FIG. 7, and when the pressure bulkhead 33 is installed, the sheet-like elastic body 42 follows the ground surface G. It spreads in a disk shape (when the outer shape is circular), and a contact area with the ground surface G that is sufficiently large with respect to the thickness of the pressure bulkhead 33 is obtained.
  • a loading body 44 such as an embankment on the spread portion 43
  • the spread portion 43 is brought into close contact with the ground surface G, and sufficient airtightness can be maintained.
  • a fluid such as water is used as a sealing material at the portion of the ground surface G that comes into contact with the ring-shaped elastic body 41 or the sheet-shaped elastic body 42. It may be penetrated, which increases the adhesion to the ground surface and further increases the airtightness.
  • the embodiment shown in FIG. 9 is an example in which a tubular body 45 is provided as an airtight holding member at the end of the opening 34 in the pressure bulkhead 33.
  • the cylindrical body 45 is made of a hard material such as steel, and has a larger thickness than the pressure bulkhead 33.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Pathology (AREA)
  • Soil Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Molecular Biology (AREA)
  • Biomedical Technology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Remote Sensing (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

L'invention porte sur un procédé d'analyse de l'air souterrain consistant: à mettre en place une ventouse, (1) présentant des ouvertures (4 et 5) face à la surface du sol; à prélever un échantillon d'air souterrain dans la ventouse en la soumettant à une dépression; et à analyser l'air prélevé. La structure de la ventouse (1) au moins double comprend une paroi extérieure (2) et une paroi intérieure (3). Comme l'air souterrain pénétrant entre la paroi (2) et la paroi (3) est mélangé à l'air atmosphérique (23) le mélange est rejeté à l'extérieur, tandis que la chambre (8) délimitée par la cloison intérieure (3) se remplit uniquement d'air souterrain qui est prélevé et analysé.
PCT/JP2002/009942 2001-09-27 2002-09-26 Procede et dispositif non destructifs d'analyse de l'air souterrain, procede non destructif de controle de la contamination des sols et cloison etanche a cet effet WO2003029782A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2001297719A JP3965505B2 (ja) 2001-09-27 2001-09-27 地下空気調査方法及び装置
JP2001-297719 2001-09-27
JP2001382234 2001-12-14
JP2001-382234 2001-12-14

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WO2003029782A1 true WO2003029782A1 (fr) 2003-04-10

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PCT/JP2002/009942 WO2003029782A1 (fr) 2001-09-27 2002-09-26 Procede et dispositif non destructifs d'analyse de l'air souterrain, procede non destructif de controle de la contamination des sols et cloison etanche a cet effet

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112611858A (zh) * 2020-10-20 2021-04-06 浙江省海洋水产研究所 易挥发有机物毒性实验装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5513719Y2 (fr) * 1974-03-28 1980-03-27
JPS60156437U (ja) * 1984-03-28 1985-10-18 理研計器株式会社 地面用ガス採集装置
JPH11281605A (ja) * 1998-03-30 1999-10-15 Osaka Gas Co Ltd ガス測定装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5513719Y2 (fr) * 1974-03-28 1980-03-27
JPS60156437U (ja) * 1984-03-28 1985-10-18 理研計器株式会社 地面用ガス採集装置
JPH11281605A (ja) * 1998-03-30 1999-10-15 Osaka Gas Co Ltd ガス測定装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112611858A (zh) * 2020-10-20 2021-04-06 浙江省海洋水产研究所 易挥发有机物毒性实验装置

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