JP7107774B2 - Ground sample sampling method and sampling device - Google Patents

Description

The present invention relates to a ground sample sampling method and a sampling apparatus for collecting test samples for ground physical property information.

Specimens for mechanical tests are usually cylindrical, and a plurality of specimens are required for each type of test. The diameter of the boring hole for undisturbed sample collection is 4 to 5 inches. The main part of each is made to have approximately the same size and a substantially circular shape.

Undisturbed sampling of sandy ground below the groundwater table may cause disturbance such as changes in the contact state of soil particles during sampling, drop-off when pulling up the sampling sample from the ground, and loose sandy ground. In order to solve problems such as the fact that the shape cannot be maintained and the specimen self-destructs and cannot be prepared later, a method has been used in which the interstitial water is frozen and solidified before sampling.

As a method of sampling after freezing and solidifying pore water, the method that was often used in the initial stage was to insert a frozen outer tube with a closed bottom into the borehole in the sampled ground, and open-bottom injection into this. There is a known method of inserting a pipe, injecting low-temperature fluid from the top, discharging it from the bottom, exchanging heat with the surrounding ground, creating frozen soil, rising inside the frozen outer pipe, and discharging it to the ground. there is

Since the frozen soil created in this way has a columnar shape with a swollen tip, it can only be used in cases where it is close to the ground surface on a small scale. Therefore, the following technical developments have been made so far. Representative examples are shown below.

In Patent Document 1, a large-diameter excavation is performed to the upper surface of the stratum to be sampled, a small-diameter hole is drilled in the center, a freezing pipe is inserted, and a low-temperature fluid is injected. After ringing, it is lifted up together with the freezing tube, and a large number of cylindrical test specimens are collected.

In Patent Document 2, in order to omit the large-diameter coring process, a small-diameter boring is first performed, a frozen tube is installed, and after creating a large frozen soil mass, boring for sample sampling is performed from the ground surface around the frozen tube. , is a method of coring frozen soil to collect test specimens. Therefore, although a large drilling machine is not necessary, many on-site corings of expensive frozen soil are performed for invisible underground frozen soil masses before evaluation of collected samples. Such a construction method is most commonly used.

Patent document 3 is a construction method that can reduce the amount of frozen soil created by reducing the turbulent area of the ground by installing a small-diameter self-drilling freezing pipe. Since it will be pulled up together with the pipe, it often requires a larger excavator than usual.

In Patent Document 4, in order to use the created frozen soil more efficiently, two systems of U-shaped pipes connected to the inside of the frozen pipe are arranged on the left and right half circumferences, and a low-temperature fluid is injected into them to form an eccentric frozen soil column. It is a construction method that can economically extract specimens with a larger diameter, but in many cases a drilling machine similar to that of Patent Document 3 is required.

Thus, the sampling methods or sampling devices described in these documents require coring or the use of heavy equipment to collect the frozen soil column, making it difficult to collect the frozen soil column. .
In addition, it took time and money to construct the frozen soil pillars.

JP-A-60-100737 JP-A-61-251742 JP-A-07-127368 JP-A-09-3867

In view of the conventional drawbacks as described above, the present invention provides a ground sample sampling method that enables the collection of frozen ground samples (frozen soil columns) without coring or heavy machinery, and that can reduce the time and cost required to create frozen soil columns. and to provide a sampling device.

In order to achieve the above object, a ground sample sampling method according to claim 1 of the present invention provides a heat source for inserting a heat source unit capable of heating and cooling and a sample extraction member into the soil from which the ground sample is taken. a unit inserting step, a ground sample freezing step of cooling the heat source unit inserted in the heat source unit inserting step and freezing the ground sample around the heat source unit, and heating the heat source unit after the ground sample freezing step. a heating step of melting a portion of the frozen ground sample; a heat source unit extraction step of extracting the heat source unit from the frozen ground sample; a ground sampling step for sampling a frozen ground sample without coring, the heat source unit comprising a plurality of main fluid pipes through which a cooling fluid for cooling the ground sample flows; and a pair of sub-fluid pipes through which a hot fluid flows. The plurality of main-fluid pipes and the pair of sub-fluid pipes are arranged in a substantially semicircular shape in plan view, and the pair of A secondary fluid pipe is arranged at both ends.

The heat source unit inserting step of the ground sample sampling method according to claim 2 is characterized by inserting the heat source unit into the bottom of a bored hole.

The main fluid pipe of the ground sample sampling method according to claim 3 uses a square pipe, divides the interior of the square pipe into two diagonally in a plan view, and has a partition wall with a fluid passage part at the bottom. , a plurality of main fluid pipes each having an outward path and a return path for the fluid.

A ground sample sampling method according to claim 4, wherein the partition wall is provided with a temperature control hole for reducing a temperature difference between the upper and lower sides.
The ground sample sampling method according to claim 5 is characterized in that an outer portion of the heat source unit is provided with a heat insulating material.

The ground sample sampling apparatus according to claim 6, which can be inserted into the soil from which the ground sample is to be collected, comprises a plurality of main fluid pipes through which a cooling fluid for cooling the ground sample flows, and a heating fluid for warming the ground sample. ground sample freezing means for supplying a cooling fluid to a plurality of main fluid pipes of the heat source unit to freeze the ground sample around the heat source unit; A ground sample heating means for supplying a heated fluid to the fluid pipe to heat a part of the outer periphery of the ground sample, and a sample extraction member for pulling out the frozen ground sample, and the plurality of main fluid pipes. The pair of secondary fluid pipes are arranged to have a substantially semicircular shape in plan view, and the pair of secondary fluid pipes are arranged at both ends.

The main fluid pipe of the ground sample sampling apparatus according to claim 7 uses a square pipe, and divides the interior of the square pipe into two diagonally in a plan view, and has a partition wall with a fluid passage part at the bottom. , a plurality of main fluid pipes each having an outward path and a return path for the fluid.

In the ground sample sampling apparatus according to claim 8, the partition wall is provided with a temperature control hole for reducing the temperature difference between the upper and lower sides.
The ground sample sampling apparatus according to claim 9 is characterized in that an outer portion of the heat source unit is provided with a heat insulating material.

As is clear from the above description, the present invention has the following effects.
(1) In each invention described in claim 1 and claim 6, the ground sample around the freezing tube is frozen in a substantially inverted cone shape or a substantially cylindrical shape, so that the frozen ground sample has a large lifting resistance. can be prevented, and the ground sample can be easily pulled out.
As a result, the construction period can be shortened, construction costs can be reduced, and large-scale equipment and advanced technology for coring frozen soil are no longer required, making it possible to easily sample ground samples.
(2) In addition, the ground sample can be extracted without coring around the frozen ground sample.
In other words, ground freezing increases the construction period and construction cost in geometric progression as the thickness of the frozen soil from the frozen pipe increases. In order to extract the frozen soil created in this way, it was not possible to pull it out by the conventional construction method, so the expensive outer peripheral frozen soil was cored and discarded, and only the frozen soil column part was extracted. However, by creating an inverted frustum-shaped frozen soil mass, all the created frozen soil can be collected without coring.
Therefore, since all the created frozen soil masses can be collected, the ratio of the amount of frozen soil that can be used for the purpose of freeze sampling to the amount of created frozen soil can be dramatically improved.
(3) The invention described in claim 2 also provides the same effects as (1) to (2) above. (4) The inventions described in claims 3 and 7 also provide The same effect as (3) can be obtained, and the cooling fluid can be efficiently circulated.
(5) Each of the inventions recited in claims 4 and 8 can provide the same effects as those of (1) to (3) above, and can cool efficiently.
(6) Each of the inventions described in claims 5 and 9 can also obtain the same effects as the above (1) to (5), and can collect ground samples from which test samples can be collected efficiently. .

1 to 10 are explanatory diagrams showing the first embodiment of the present invention.
11 to 14 are explanatory diagrams showing the second embodiment of the present invention.
FIG. 4 is a process chart of the ground sample sampling method of the first embodiment. 1 is a front view of a ground sample sampling device according to a first embodiment; FIG. Front view of the heat source unit. 4-4 line cross-sectional view of FIG. The top view of a main fluid pipe. 6-6 line cross-sectional view of FIG. Explanatory drawing of a ground sample freezing process. Explanatory drawing of a heating process. Explanatory drawing of a heat-source unit extraction process. Explanatory drawing of a ground sampling process. FIG. 4 is a process diagram of a ground sample sampling method according to the second embodiment. The front view of the sampling apparatus of the ground sample of 2nd Embodiment. Front view of the heat source unit. 14-14 line sectional view of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail by means of embodiments for carrying out the present invention shown in the drawings.

In the first embodiment for carrying out the present invention shown in FIGS. 1 to 10, 1 is a ground sample sampling method for determining characteristic values for determining the liquefaction strength and dynamic deformation coefficient of the ground.

This ground sample sampling method 1 includes, as shown in FIG. A ground sample freezing step 6 for cooling the heat source unit 3 inserted in the heat source unit inserting step 5 and freezing the ground sample 2 around the heat source unit 3, and heating the heat source unit 3 after the ground sample freezing step 6. Then, a heating step 7 for melting a part of the frozen ground sample 2, a heat source unit extraction step 8 for extracting the heat source unit 3 from the frozen ground sample 2, and the frozen ground sample 2 after the heat source unit extraction step 8. and a ground sampling step 9 in which the frozen ground sample 2 is extracted from the ground by the extraction member 4 and collected without coring.

The ground sample sampling apparatus 10 used in this ground sample sampling method 1 can be inserted into the soil from which the ground sample 2 is sampled, and has a plurality of main fluid 11 pipes through which a cooling fluid for cooling the ground sample 2 flows. and a heat source unit 3 having a pair of secondary fluid pipes 12 through which a heating fluid for warming the ground sample flows, and a sample extracting member 4 for extracting the frozen ground sample 2.

The heat source unit 3 includes a plurality of, in this embodiment, six main fluid pipes 11 through which a cooling fluid for cooling the ground sample 2 flows, and a pair of sub-fluid pipes through which a heating fluid for warming the ground sample 2 flows. 12, the plurality of main fluid pipes 11 and the pair of secondary fluid pipes 12 are arranged in a substantially semicircular arc shape in plan view, and the pair of secondary fluid pipes 12 are arranged at both ends. are placed in Here, the term “substantially semicircular shape” refers to a substantially perfect semicircular semicircular shape, an elliptical semicircular shape, a shape in which a polygon that can be arranged in close proximity to these semicircular arc shapes is divided into halves, and the like. is included.

In addition, a penetrating pipe 14 having a generally semicircular arc shape in a plan view and having a shoe 13 at its tip and a heat insulating material 15 are provided on the outer peripheral portions of the main fluid pipe 11 and the subfluid pipe 12 .

In the heat source unit inserting step 5, as shown in FIG. 5, the heat source unit 3 is inserted into the soil of the ground from which the ground sample 2 is to be collected. In this step, a boring hole 16 is drilled in advance, and the heat source unit 3 is inserted into the soil from the hole bottom 16a of the boring hole 16. As shown in FIG. In this embodiment, since the penetration pipe 14 is provided, the heat source unit 3 can be smoothly inserted into the soil.

The boring hole 16 of this embodiment is formed to have a larger diameter than the heat source unit 3 .

When collecting the ground sample 2 near the ground surface, the heat source unit 3 may be inserted into the soil from the ground surface without forming the boring hole 16 . Further, the heat source unit 3 may be inserted not only through the boring hole 16 but also through a concave portion formed by heavy machinery or the like.

After positioning the heat source unit 3 at a predetermined position in the soil, the ground sample freezing step 6 is performed to cool the heat source unit 3 and freeze the ground sample 2 around the heat source unit 3 .
In this ground sample freezing step 6, a cooling fluid is passed through the main fluid pipe 11 to freeze the ground around the heat source unit 3. FIG.

As shown in FIGS. 5 and 6, in this embodiment, the main fluid pipe 11 is a square pipe, and a partition wall 17 is provided so as to divide the inside of the square pipe into two diagonally in a plan view. It is A fluid passing portion 18 is formed at the bottom of the partition wall 17 , and outward and return paths of the fluid are formed in each of the plurality of main fluid pipes 11 .

Further, the partition wall 17 is provided with a temperature control hole 19 for reducing the temperature difference between the upper and lower sides.

By the way, although a square pipe is used as the main fluid pipe 11, a cylindrical pipe or the like may be used, and the same effect can be obtained by providing a partition wall so as to divide the inside of the pipe into two in the longitudinal direction. can be done.

In this embodiment, the main fluid pipe 11 of the heat source unit 8 is arranged in a semicircular shape as a whole when viewed from above. The main fluid pipes 11 are connected to the main fluid connection pipe 20, and are provided three each on the left and right sides from the center of the heat source unit 3. , etc. flows into the six main fluid pipes 11 through the main fluid connecting pipes 20 and circulates.

The six main fluid pipes 11 are arranged in a semicircular shape in a plan view, and since they are provided with a heat insulating material 15 on the outside, the ground in the inner direction freezes, forming a substantially cylindrical frozen soil column. When the heat insulating material 15 is not used, some frozen ground samples 2 are also formed outside the main fluid pipe 11 . By using the heat insulating material 15 as in the present embodiment, the frozen soil column is formed only approximately inside the heat source unit 3, so that test samples can be collected efficiently.

This cooling fluid exchanges heat with the ground and is discharged through the main fluid discharge pipe 20 . In addition, after the formation of the frozen soil column 2, by injecting the hot fluid into the main fluid pipe 11 as needed, it also has the role of canceling the freeze-adhesion force and facilitating extraction.

After forming the frozen ground sample 2 (frozen soil column) in the ground sample freezing step 6, it is necessary to pull out this frozen soil column 2 from the ground. For sampling without coring, if the ground is shallow and loose sandy ground, the freezing force of the heat source unit 3 can be used to pull up the ground as it is. However, other than that, the frictional resistance on the side surface of the frozen soil column 2 is large and it cannot be pulled up easily.

Therefore, a heating step 7 is performed in which a heating fluid is flowed through the pair of secondary fluid pipes 12 to partially melt the outer peripheral portion of the frozen soil column 2 .

The sub-fluid pipe 12 is provided to keep the range of freezing by the main fluid pipe 11 within the outer peripheral portion of the sub-fluid pipe 12, to prevent the heat of the main fluid pipe 11 from diffusing due to solid conduction, and to fix each member. In this embodiment, it is formed in a C shape or an inverted C shape when viewed from the front.
Further, the sub-fluid pipe 12 is also formed to have a substantially rectangular cross-sectional shape, and is provided with a partition wall 17 like the main fluid pipe 11 so that an outward path and a return path are formed in one pipe.

The pair of secondary fluid pipes 12 are arranged outside the main fluid pipe in front view, and a heat insulating material 15 is provided between them and the main fluid pipe 11 .

The secondary fluid pipe 12 is connected to the secondary fluid inlet/outlet 22, and the temperature-controlled fluid is injected from the secondary fluid inlet/outlet 22, passes through the upper antifreeze pipe 12a of the secondary fluid pipe 12, and is side frozen. It flows down the antifreeze pipe 12b, is reversed in the lower antifreeze pipe 12c, and is discharged from the auxiliary fluid inlet/outlet 22 on the return path by the partition wall 17 similar to the main fluid pipe 11.

In this heating step 7, if necessary, hot fluid may also be injected into the main fluid pipe 11 to eliminate the freeze-adhesion force and make it easier to pull out.

After forming the frozen soil column 2 in the heating step 7, the sub-fluid pipe 12 of the heat source unit 3 is heated to eliminate the freezing force on the surface, and then the heat source unit extraction step 8 is performed to pull out the heat source unit 3 from the frozen soil column 2. - 特許庁In this step, the heat source unit 3, the penetration pipe 14, etc. are pulled out from the ground, and the sample pulling member (anchor rod) 4 is left in the frozen ground sample (frozen soil column) 2.

By pulling out the heat source unit 3 and the like from the frozen soil column 2 in this manner, the outer diameter of the frozen soil column 2 is reduced, and the lateral frictional force is reduced. By pulling out the heat source unit 3 in advance in this manner, the frozen soil column 2 can be pulled up from the ground more easily.
After the heat source unit 3 is pulled out, a ground sample extraction step 9 is performed in which the anchor rod 4 as a sample extraction member 4 embedded in the vicinity of the upper part of the frozen soil column 2 is pulled up simply by applying a pulling force to it.

In the ground sampling process 9, the frictional resistance of the frozen soil column 2 is reduced by the heating process 7 and the heat source unit extraction process 8, so the frozen soil column 2 can be extracted without coring.

By the way, a specific method for collecting a larger test specimen from the frozen soil column 2 collected from the hole bottom 16a of the borehole 16 is to cut a plate curved into a semicircle along the hole wall or a plurality of plates in half. By penetrating the heat source unit 3 combined in a circular shape into the hole bottom ground and creating the frozen soil column 2 within a range not exceeding the outer edge of the secondary fluid pipe 12, the diameter of the borehole 16 and the outer peripheral portion of the heat source unit 3 Even if the radius is approximately the same, the frozen soil column 2 can be collected.
From the ground sample 2 collected in this way, a test sample is collected in accordance with the test, and various soil tests are performed.

The ground sample sampling device 10 can be inserted into the soil from which the ground sample 2 is collected, and has a plurality of main fluid pipes 11 through which a cooling fluid for cooling the ground sample 2 flows and a heating fluid for warming the ground sample flows. A heat source unit 3 having a pair of secondary fluid pipes 12, a sample drawing member 4 for drawing the frozen ground sample 2, and the heat source unit 3 and the penetration pipe 14 are attached, and the sample drawing member 4 for drawing moves vertically. A sampler head 23 is attached to the sampler head 23 , and a rod 24 is connected to the top of the sampler head 23 . This rod 24 is connected to a well-known penetration device or the like (not shown), and the sampler head 23, the heat source unit 3, etc. are inserted into the soil by the load from this penetration device or the like.
The sampler head 23 is cylindrical and has a water passage port 25 on the outer peripheral surface of the upper part, the heat source unit 3 is attached to the lower end, and the temperature control mechanism 26 and the rod 24 are attached to the upper part.

The temperature control mechanism 26 includes a pair of upper and lower thermometer penetration rings 27 and 28 attached inside the cylinder of the sampler head 23, and a thermometer 29 that measures the temperature at the tip portion and is fixed to the lower thermometer penetration ring 28. and a thermometer cable 30 attached to the lower thermometer penetration ring 28 .

Thermometers 29 are provided so as to be positioned at four positions on the circumference of the frozen soil column 2. When the sampler head 23 or the like is penetrated into the soil, a pair of upper and lower thermometer penetration rings 27 and 28 are used. It is pasted with an adhesive tape (not shown) and penetrated so as not to fall.

Since the thermometer 29 is in the frozen soil column 2 when the ground sample 2 is frozen and the frozen ground sample 2 is pulled up, the temperature Since the thermometer 29 also remains in the frozen soil column 2 together with the anchor rod 4, the thermometer 29 fixed to the lower thermometer-penetration ring 28 causes the lower thermometer-penetration ring 28 and the upper thermometer-penetration ring 27 to The adhesive tape between them is broken, and a pair of upper and lower thermometer penetration rings 28 are lifted apart by the length of the frozen soil column 2 .
The thermometer cable 30 is set to a length that can absorb the distance between the pair of upper and lower thermometer penetration rings 27 and 28 .

The two anchor rods 4 are supported by the sampler head 23 so as to be vertically slidable, and are positioned inside the heat source unit 3 as shown in FIG.
This anchor rod 4 is inserted into the soil together with the heat source unit 3 and the like, and frozen in the ground sample 2 in the ground sample freezing step 6 . The anchor rod 4 may be provided with a stopper (not shown) so that the anchor rod 4 can be inserted to an appropriate depth.

Since the two anchor rods 4 are frozen together with the ground sample 2 , the frozen ground sample 2 is pulled up together by pulling up the anchor rods 4 .
The cold liquid inlet 21 of the main fluid pipe 11 and the secondary fluid inlet/outlet 22 of the secondary fluid pipe 12 of the heat source unit 3 are connected to non-permeable fluid supply/discharge pipes 31, respectively. As for the supply of the heated fluid, the fluid controlled to various temperatures by a ground control mechanism (not shown) is injected and discharged through the fluid supply/discharge pipe 31 .

[Different Modes for Carrying Out the Invention]
Next, different modes for carrying out the invention shown in FIGS. 11 to 14 will be described. In describing these different modes for carrying out the present invention, the same components as those in the first mode for carrying out the present invention are denoted by the same reference numerals, and duplicate descriptions are omitted.

In the second embodiment for carrying out the invention shown in FIGS. 11 to 14, the main difference from the first embodiment for carrying out the invention is that the A ground sample sampling method 1A in which a ground sample freezing step 6A and a ground sample heating step 7A are performed using a heat source unit 3A in which a plurality of main fluid pipes 11 and the pair of sub fluid pipes 12 are arranged, and such In that the ground sample sampling apparatus 10A using the heat source unit 3A is used, even with such a configuration, the same effects as those of the first embodiment for carrying out the present invention can be obtained.

Here, the substantially mountain-shaped shape includes shapes such as a right angle, an obtuse angle, an acute angle, and a trapezoid, and refers to a shape obtained by dividing a quadrangle or other polygon in half.
In this embodiment, the penetrating pipe 14 and the heat insulating material 15 are arranged in a substantially mountain shape in a plan view along the outside of the heat source unit 3A as described above.

In the embodiment of the present invention, the main fluid pipe is provided with a partition wall.
In addition, although the heat insulating material is not necessarily provided, the use of the heat insulating material makes it possible to construct the frozen soil column efficiently and to pull it out more easily.

By the way, in the embodiment of the present invention, a substantially C-shaped secondary fluid pipe and a substantially inverted C-shaped secondary fluid pipe are used so that the secondary fluid pipe covers the entire outer peripheral portion of the main fluid pipe when viewed from the front. However, since it is sufficient that the secondary fluid pipe is arranged outside the main fluid pipe when viewed from the front, for example, a pair of linear secondary fluid pipes may be arranged only on the outer sides of the main fluid pipe. Alternatively, a substantially L-shaped or substantially inverted L-shaped secondary fluid pipe may be used to cover part of the outer peripheral portion of the main fluid pipe in a front view.

INDUSTRIAL APPLICABILITY The present invention is used in industries that perform sampling for obtaining ground physical property information.

1, 1A: Ground sample sampling method,
2: ground sample, 3, 3A: heat source unit,
4: sample extraction member, 5: heat source unit insertion step,
6, 6A: ground sample freezing step, 7, 7A: heating step,
8: heat source unit extraction process, 9: ground sampling process,
10, 10A: ground sample sampling device,
11: main fluid pipe, 12: secondary fluid pipe,
13: Shoe, 14: Penetration tube,
15: Thermal insulation, 16: Boring hole,
17: partition wall, 18: fluid passage part,
19: temperature control hole, 20: main fluid connecting pipe,
21: cold liquid inlet, 22: secondary fluid inlet and outlet,
23: sampler head, 24: rod,
25: water flow port, 26: temperature control mechanism,
27: upper thermometer penetration ring, 28: lower thermometer penetration ring,
29: thermometer, 30: thermometer cable,
31: Fluid supply and discharge pipe.

Claims (9)

A heat source unit inserting step of inserting a heat source unit capable of heating and cooling and a sample extraction member into the soil from which a ground sample is to be collected, cooling the heat source unit inserted in the heat source unit inserting step, and cooling the heat source unit. A ground sample freezing step of freezing the surrounding ground sample, a heating step of heating the heat source unit after the ground sample freezing step to partially melt the frozen ground sample, and removing the heat source unit from the frozen ground sample. and a ground sample extraction step of extracting a frozen ground sample from the ground by a sample extraction member after the heat source unit extraction step and collecting the frozen ground sample without coring, wherein the heat source unit consists of a plurality of main fluid pipes through which a cooling fluid for cooling the ground sample flows, and a pair of sub-fluid pipes through which a heating fluid for warming the ground sample flows, the plurality of main fluid pipes and the The pair of secondary fluid pipes are arranged to have a substantially semicircular arc shape or a substantially mountain shape in plan view, and the pair of secondary fluid pipes are arranged outside the main fluid pipe in front view. Sampling method. 2. The ground sample sampling method according to claim 1, wherein the heat source unit inserting step includes inserting the heat source unit into the bottom of a boring hole. The main fluid pipe is provided with a partition wall that divides the interior into two parts in a plan view and has a fluid passage portion at the bottom thereof, and a plurality of main fluid pipes are provided with outward and return paths for the fluid, respectively. 3. The ground sample sampling method according to claim 1 or 2. 4. The ground sample sampling method according to claim 3, wherein the partition wall is provided with a temperature control hole for reducing a temperature difference between the upper and lower sides. 5. The ground sample sampling method according to any one of claims 1 to 4, wherein an outer portion of the heat source unit is provided with a heat insulating material. A ground sample sampling device inserted into the soil to collect a ground sample, comprising a plurality of main fluid pipes that can be inserted into the soil and through which a cooling fluid that cools the ground sample flows, and a heating fluid that heats the ground sample. a heat source unit having a pair of secondary fluid pipes through which a liquid is flowing; The ground sample can be frozen, and a heating fluid can be supplied to the secondary fluid pipe to heat a part of the outer peripheral portion of the ground sample,
The plurality of main fluid pipes and the pair of secondary fluid pipes are arranged in a substantially semicircular arc shape or a substantially chevron shape in plan view, and the pair of secondary fluid pipes are arranged at both ends. Sampling equipment for ground samples. The main fluid pipe is provided with a partition wall that divides the interior into two parts in a plan view and has a fluid passage portion at the bottom thereof, and a plurality of main fluid pipes are provided with outward and return paths for the fluid, respectively. Item 7. The ground sample sampling device according to Item 6. 8. The ground sample sampling apparatus according to claim 7, wherein the partition wall is provided with a temperature control hole for reducing a temperature difference between the upper and lower sides. 9. The ground sample sampling apparatus according to any one of claims 6 to 8, wherein an outer portion of the heat source unit is provided with a heat insulating material.

Images