JP2007039998A - Sampler for investigating soil contamination - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sampler for investigating soil contamination having no possibility of outflow of sediment even when water is supplied to the distal end. <P>SOLUTION: This sampler comprises an outer tube, a first head threaded to the upper end of the outer tube, a bit threaded to the lower end of the outer tube, a first inner tube disposed in the outer tube so that a first space can be formed between the first inner tube and the inner surface of the outer tube, a second inner tube disposed in the first inner tube so that a second space can be formed between the second inner tube and the inner surface of the first inner tube and in which a specimen to be sampled is stored, a seal material disposed between the lower end of the second inner tube and the bit and cutting off a communication between the inner part of the second inner tube and the second space, a second head threaded to the upper end of the second inner tube and rotatably fitted to the lower end of the first head, a hollow boring rod threaded to the first head, and one or a plurality of hoses connected to the upper end of the first head. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sampler for soil contamination investigation for collecting a sample for investigating soil contamination and groundwater contamination.

  In recent years, soil contamination has become a social problem. Until the Showa 40s, the majority of soil pollution problems were mainly related to agricultural land pollution caused by heavy metals. However, in recent years, soil pollution in urban areas has become a problem. Has been. In order to investigate soil contamination, it is necessary to coral (sample) the soil to be investigated and analyze it.

  A sampler is widely known as an instrument for performing such coring. The sampler is generally adapted to dig the ground while supplying water to the tip so that the tip does not burn.

  However, when water is supplied to the tip, part of the earth and sand to be collected may flow out. On the other hand, when coring without water supply, the sampler is dug while rotating, so heat is generated at the tip of the sampler, which may affect the properties of the soil to be collected. is there.

  The present invention has been developed in view of such a situation, and an object of the present invention is to provide a soil contamination investigation sampler that does not cause the sediment to flow out even if water is supplied to the tip.

  The sampler for soil contamination investigation according to claim 1 of the present application includes an outer pipe, a first head screwed to the upper end of the outer pipe, a ring-shaped bit screwed to the lower end of the outer pipe, A second space is formed between a first inner tube disposed in the outer tube and an inner surface of the first inner tube so that a first space is formed between the inner surface of the outer tube and the inner surface of the outer tube. A second inner tube disposed in the first inner tube and containing a sample to be collected; disposed between a lower end of the second inner tube and the bit; and the interior of the second inner tube and the A sealing material that blocks communication with the second space; a second head that is screwed to the upper end of the second inner pipe and is rotatably attached to the lower end of the first head; and a screw that is screwed to the first head A joined hollow boring rod, and one or more hoses coupled to an upper end of the first head; The boring rod communicates with the second space via a first through hole provided in the first head, and the second space passes through an opening provided at a lower end of the first inner pipe. Communicated with the first space, the first space communicated with the hose through a first through hole provided in the first head, and water supplied from the boring rod during boring, The first through hole, the second space, the opening, the first space, the second through hole, and the hose are configured to be collected.

  The sampler for soil contamination investigation according to claim 2 of the present application is characterized in that in the sampler of claim 1, the sampler further comprises a stopper fitted into the opening of the bit and the lower end of the second inner tube. It is.

  The sampler for soil contamination investigation according to claim 3 of the present application is the sampler according to claim 1 or 2, wherein a plurality of metal chips or protrusions are arranged on the outer periphery of the bit, and notches or grooves are formed between the adjacent protrusions. Are respectively arranged.

  The sampler for soil contamination investigation according to claim 4 of the present application is the ring-shaped first recovered water for receiving the water recovered from the hose in the sampler of any one of claims 1 to 3. A receiving container, the first recovered water receiving container is placed on the ground in a state where the boring rod and the hose are passed through a central opening, and an end of the hose is disposed in the first recovered water receiving container. It is characterized by being put in.

  The sampler for soil contamination investigation according to claim 5 of the present application is the ring-shaped second recovered water for receiving the water recovered from the hose in the sampler according to any one of claims 1 to 3. A receiving container, and the second recovered water receiving container is rotatably attached to the boring rod on the ground in a state where the boring rod and the hose are passed through a central opening; Is contained in the second recovered water receiving container.

  The soil contamination investigation sampler according to claim 6 of the present application is the sampler according to any one of claims 1 to 5, wherein the sampler is disposed inside the second inner tube, and a cylindrical vinyl bag is provided. It further comprises a cylindrical inner extension covered in a bumped state and a tube ring for holding the upper end of the bag.

  The sampler for soil contamination investigation according to claim 7 of the present application is the sampler according to any one of claims 1 to 6, wherein the plug is prevented from descending to a location deeper than a certain depth during excavation. The stopper fixing means further comprises a small rod having an upper end fixed to the ground fence and a lower end fixed to the stopper, the small rod passing through the boring rod, and The head extends through the head and the second head to the stopper.

  According to the present invention, there is provided a sampler for soil contamination investigation that solves the two problems of sediment runoff caused by water supply and changes in soil properties caused by heat generation. Further, in the sampler of the present invention, by providing a metal chip and a notch on the outer periphery of the bit, a slime escape path is formed, thereby enabling efficient sampling. Moreover, in the sampler of the present invention, it is possible to perform an efficient recovered water treatment by providing a recovered water receiving container. Furthermore, by arranging the inner extension covered with the vinyl bag, the sample can be accommodated in the bag, and the work efficiency can be improved.

  Next, a soil contamination investigation sampler according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a soil contamination investigation sampler according to a preferred embodiment of the present invention. A soil contamination investigation sampler of the present invention indicated by reference numeral 10 as a whole in FIG. 1 includes an outer tube 12, a first head 14 screwed to the upper end of the outer tube 12, and a screw bonded to the lower end of the outer tube 12. The bit 16 has a ring shape as a whole.

  The sampler 10 for soil contamination investigation also includes a first inner tube 20 disposed in the outer tube 12 so that a first space 18 is formed between the inner surface of the outer tube 12 and an inner surface of the first inner tube 20. And a second inner tube 24 disposed in the first inner tube 20 so as to form a second space 22 therebetween. As will be described later, the inside of the second inner tube 24 becomes a space in which a sample is accommodated.

  The first inner tube 20 has an upper end screwed to the first head 14 and a lower end in contact with the upper surface of the bit 16. The first inner tube 20 has a first space 18 and a first end at the lower end (tip). An opening 20 a for communicating with the two spaces 22 is provided. The second inner tube 24 has an upper end screwed to the second head 26 and a lower end in contact with the upper surface of the bit 16. A sealing material (for example, an O-ring) 24 a is arranged at the tip of the second inner tube 24 so that the inside of the second inner tube 24 and the second space 22 do not communicate with each other.

  The second head 26 is rotatably attached to the lower end of the first head 14 via a bearing 28. Thereby, the outer tube 12 and the first inner tube 20 rotate during sampling, but the second inner tube 24 does not rotate.

  A hollow boring rod 30 is screwed to the upper end of the first head 14, and the boring rod 30 communicates with the second space 22 through a first through hole 14 a provided in the first head 14. ing. One or a plurality of (two in FIG. 1) hoses 32 are attached to the outer periphery of the upper end of the first head 14, and the hose 32 is a second through hole 14 b provided in the first head 14. The first space 18 communicates with the first space 18.

  A plug 34 is fitted into the opening 16 a of the ring-shaped bit 16 as a whole and the lower end (tip) of the second inner tube 24. The plug 34 shown in FIG. 1 has an inverted trapezoidal shape in a side view in which the diameter of the upper end 34b is larger than the diameter of the lower end 34a, and is formed of an elastic material such as rubber or cork.

  As described above, the inside of the second inner tube 24 becomes a space for accommodating a sample. However, the second head 26 that is screwed to the upper end of the second inner tube 24 is provided with the second inner tube 24. Sealing means 36 for sealing the inside is provided. As best shown in FIG. 2, the sealing means 36 is arranged on the first side 36 a of a small hole arranged on the inner side of the second head 26, and on the outer side of the second head 26. A large-diameter second hole 36b communicating with the hole 36a, a ball 36c having substantially the same diameter as that of the second hole 36b, and disposed at the outer end of the second hole 36b. And a stopper 36d for preventing the ball 36c from dropping out of the second hole 36b.

  By fitting the stopper 34 at the lower end of the second inner tube 24 and providing the sealing means 36 at the upper end, the collected sample is not exposed to the influence of water. That is, water is supplied into the second space 22 through the boring rod 30, but the water pressure in the second space 22 acts on the ball 36c of the sealing means 36, and the first hole 36a is blocked by the ball 36c. Since the stopper 34 has an inverted trapezoidal shape, water from the second space 22 does not reach the sample to be collected. Further, the provision of the stopper 34 can eliminate the possibility that extra components such as volatile components are mixed into the sample even when the sample to be collected is below the groundwater level.

  FIG. 4 is an enlarged view showing the bit 16 screwed to the lower end of the outer tube 12. Preferably, a plurality of (four in FIG. 2) metal chips or projections 16b and notches or grooves 16c respectively disposed between adjacent projections 16b are provided on the outer periphery of the bit 16. The protrusion 16b and the groove 16c serve as a slime escape path during boring.

  FIG. 5A is a view showing the first recovered water receiving portion 38 disposed at the upper end of the hose 32. As will be described in detail later, the water supplied into the sampler 10 via the boring rod 30 at the time of boring is collected on the ground via the hose 32, but the ring-shaped first collected water receiving container 38. (See FIG. 5B) is placed on the ground with the boring rod 30 and the hose 32 passed through the central opening, and the upper end of the hose 32 is placed in the first recovered water receiving container 38. Thus, the water returned to the ground can be received by the first recovered water receiving container 38. The 1st collection | recovery water receiving container 38 is connected to the water storage tank (not shown) via the pipe | tube 38a, and can arrange | position the circulation pump in a water storage tank, and can circulate the water used for boring.

  FIG. 5C is a diagram showing the second recovered water receiving container 40. The ring-shaped second recovery water receiving container 40 is rotatably attached to the boring rod 10 by a bearing 40a on the ground with the boring rod 30 and the hose 32 passed through the central opening. Is contained in the second recovered water receiving container 40. Similarly to the first recovered water receiving container 38, the second recovered water receiving container 40 is also connected to a water storage tank (not shown) via a pipe 40b. The water used can be circulated.

  Next, the use of the soil contamination investigation sampler 10 configured as described above will be described with reference to FIG. First, as a preparation stage, an air hammer (not shown) is joined to the soil contamination investigation sampler 10 and the boring rod 30 is supported by a spindle of a boring machine (not shown) installed on the ground.

  Next, the sampler 10 is rotated while water is supplied to the soil contamination investigation sampler 10 via the boring rod 30 (the second head 26 is rotatably attached to the first head 14, and thus the outer tube 12 is rotated). , Even if the bit 16 and the first inner tube 20 rotate, the second inner tube 24 does not rotate). Then, the sampler 10 excavates the ground with the bit 16, and the sample to be collected pushes the stopper 34 and gradually enters the second inner tube 24 (see FIG. 3B). At this time, the water supplied through the boring rod 30 reaches the upper portion of the bit 16 through the second space 22, cools the bit 16, and is collected on the ground through the hose 32. The generation of heat is prevented from affecting the sample, and water does not enter the second inner tube 24, so the sample does not flow out.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say, it is something.

  For example, in the above embodiment, the cylindrical inner extension 42 covered with a cylindrical transparent vinyl bag may be accommodated inside the second inner tube 24. By accommodating the inner extension 42 in the second inner tube 24, the sample can be accommodated in the bag during coring. In FIG. 6, reference numeral 44 denotes a tube ring for holding the upper end of the bag. Note that collecting a sample in a bag is described in detail in a patent developed by the present inventor (No. 3053588).

  In the above embodiment, the stopper 34 is shaped to have an inverted trapezoidal shape when viewed from the side. For example, as shown in FIG. 7, a cylindrical stopper body with an O-ring attached thereto. It may be used. In such a case, the plug body may be formed of a non-elastic material such as steel.

  FIG. 8 is a diagram showing a soil contamination investigation sampler according to another embodiment of the present invention. The soil contamination investigation sampler 10 shown in FIG. 8 has a small gravel sandwiched between the plug 34 and the inner surface of the second inner pipe 24 during the excavation of the sampler, and the plug 34 rises smoothly in the second inner pipe 24. In order to avoid the occurrence of a failure, a soil contamination investigation sampler 10 shown in FIG. 1 is provided except that a stopper fixing means for preventing the stopper 34 from descending at a position deeper than a certain depth is provided. It has substantially the same configuration. In other words, the plug fixing means has a small rod 46 whose upper end is fixed to the pit on the ground and whose lower end is fixed to the plug 34. The small rod 46 passes through the bore rod 30, and the first head 14 and It extends through the second head 26 to the plug 34. In FIG. 8, reference numeral 48 indicates a bearing, and the second inner tube 24 does not rotate even if the small rod 46 rotates during the excavation of the sampler 10. In addition, by adjusting the length of the chain block attached to the top of the ridge, the depth at which the stopper 34 can be lowered can be finely adjusted.

  FIG. 9 is a series of diagrams showing a state where coring is performed using the sampler 10 provided with the stopper fixing means. As can be easily understood from FIG. 9, it can be seen that as the sampler 10 is lowered, the stopper 34 and the small rod 46 act like a kind of piston.

It is length direction sectional drawing of the sampler for soil contamination investigation which concerns on preferable embodiment of this invention. It is an enlarged view of the sealing means provided in the 2nd head of the sampler of FIG. It is a series of figures which showed the state which is coring using the sampler for soil contamination investigation of this invention. 4A is a side view of a bit attached to the sampler of FIG. 1, and FIG. 4B is a bottom view of FIG. 4A. FIG. 5A is a view showing a first recovered water receiving container disposed at the upper end of the hose, FIG. 5B is a perspective view of the first recovered water receiving container, and FIG. 5C is a second recovered water. It is the figure which showed the receiving container. It is length direction sectional drawing which showed the modification of the sampler for soil contamination investigation provided with the inner extension. It is the perspective view which showed the modification with which the stopper fitted by the lower end of a 2nd inner pipe | tube. It is length direction sectional drawing of the sampler for soil contamination investigation which concerns on another embodiment of this invention. FIG. 9 is a series of diagrams illustrating a state where coring is performed using the sampler of FIG. 8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sampler for soil contamination investigation 12 Outer tube 14 1st head 16 bit 18 1st space 20 1st inner tube 22 2nd space 24 2nd inner tube 26 2nd head 28 Bearing 30 Boring rod 32 Hose 34 Plug 36 Sealing means 38 , 40 Recovered water container 42 Inner extension 44 Tube ring 46 Small rod 48 Bearing

Claims (7)

A sampler for soil contamination investigation,
An outer tube,
A first head screwed to the upper end of the outer tube;
A ring-shaped bit screwed to the lower end of the outer tube;
A first inner tube disposed in the outer tube such that a first space is formed between the inner surface of the outer tube;
A second inner tube that is disposed in the first inner tube so that a second space is formed between the inner surface of the first inner tube and that stores a sample to be collected;
A seal material disposed between a lower end of the second inner pipe and the bit, and blocking communication between the inside of the second inner pipe and the second space;
A second head screwed to the upper end of the second inner pipe and rotatably attached to the lower end of the first head;
A hollow boring rod screwed to the first head;
Comprising one or more hoses coupled to the upper end of the first head;
The boring rod communicates with the second space via a first through hole provided in the first head, and the second space is communicated with an opening provided at a lower end of the first inner pipe. The first space communicates with the hose through a first through hole provided in the first head, and communicates with the first space.
The water supplied from the boring rod during boring is configured to be collected through the first through hole, the second space, the opening, the first space, the second through hole, and the hose. A sampler characterized by The sampler according to claim 1, further comprising a stopper fitted into the opening of the bit and the lower end of the second inner pipe. The sampler according to claim 1 or 2, wherein a plurality of metal chips (protrusions) are disposed on the outer periphery of the bit, and a notch (groove) is disposed between the adjacent protrusions. A ring-shaped first recovered water receiving container for receiving water recovered from the hose is further provided, and the first recovered water receiving container is placed on the ground with the boring rod and the hose passed through a central opening. The sampler according to any one of claims 1 to 3, wherein the sampler is placed and an end of the hose is placed in the first recovery water receiving container. A ring-shaped second recovered water receiving container for receiving water recovered from the hose is further provided, and the second recovered water receiving container is on the ground with the boring rod and the hose being passed through a central opening. It is attached to the said boring rod so that rotation is possible, and the edge part of the said hose is put in the said 2nd collection | recovery water receiving container, The any one of Claim 1 to 3 characterized by the above-mentioned. Sampler according to item. A cylindrical inner extension that is disposed inside the second inner pipe and is covered with a cylindrical vinyl bag being loosely covered, and a tube ring for holding the upper end of the bag are further provided. The sampler according to any one of claims 1 to 5, wherein the sampler is provided. A small rod having a stopper fixing means for preventing the stopper from descending to a location deeper than a certain depth during excavation, wherein the stopper fixing means is fixed to the ground anchor at the upper end and fixed to the stopper at the lower end. The small rod passes through the boring rod and extends through the first head and the second head to the plug. The sampler according to claim 1.

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