JP4787082B2 - Intrusive ground sampling device - Google Patents

Description

  The present invention relates to a ground sampling method, and more particularly to an intrusion type ground sampling device that reliably collects a high-quality ground sample with very little mechanical disturbance required for ground engineering.

The mechanical property value of the ground varies depending on the degree of disturbance when the sample is taken from the ground. Therefore, how to collect a sample with less disturbance is an important theme of ground survey.
In the case of gravelly soil, the gravel particles are cut and collected. However, in the case of sandy soil and viscous soil with a small soil particle diameter, it is not necessary to cut the soil particles. The method is generally to collect the material by pressing it into the ground.

In the tube press-in method, as described in the Geotechnical Society's “Ground Survey Method and Explanation 2006”, a piston is attached to the tip of a thin-walled tube with a cutting edge, and when the tube is press-fitted with a boring rod, the piston moves up and down. The “fixed piston type thin wall sampler” (JGS1221), which is press-fitted in a state of being fixed on the ground with an extension rod passing through the rod so as not to move, is most often used in soft clay soil.
The same standard “hydraulic sampler” (shown in FIGS. 1, 2, and 3), which can be applied to a slightly harder ground, is also frequently used. In addition, there are a method in which a thin tube is simply press-fitted (Shelby tube sampler, etc.), a free piston type in which a piston is not fixed, and a composite sampler in which a sample storage tube is incorporated. Among these, the hydraulic sampler related to the present invention will be described below.

As shown in FIGS. 1, 2, and 3, the hydraulic sampler is inserted into a boring hole by screwing and joining a sampler head 2 to the tip of the boring rod 1.
Sampler joining the outer tube 6 corresponding to the cylinder head 2, the therein penetration piston 4 for press-fitting the penetration tube 7 in the ground is fitted, penetration tube head 5 on the lower surface of the penetration for the piston 4 Are joined.
A piston fixing rod 3 joined to the head 2 penetrates the penetrating piston 4 and the penetrating pipe head 5 in a watertight and slidable state at the distal end portion of the penetrating pipe 7, and a fixed piston 9 is attached. Inside the tube 7 is a sample storage space 8 into which a sample is taken when the piston is fixed in the depth direction and the penetration tube is press-fitted. As shown in FIG. 1, the sampler is put in the hole, and when the fixed piston 9 comes into contact with the bottom of the hole, the rod 2 is fixed on the ground so as not to move up and down.
Next, as shown in FIG. 2, pressure water is injected from the rod 1, reaches the hydraulic chamber 11 through the penetrating water channel 10 in the head 2, and pushes down the penetrating piston 4 to bring the penetrating pipe 7 into the hole bottom ground. A sample is taken into the sample storage space 8 by press-fitting. The fluid in this is discharged from the drain hole 12 in the penetration pipe head 5 into the hole.
As shown in FIG. 3, when the penetration pipe 7 is press-fitted to a predetermined depth, the pressure water is discharged from the penetration stop water drain hole 13 to stop the press-fitting of the penetration pipe 7.

The core catcher is often mounted for reasons such as the penetration of the ground becomes difficult when the sampling ground becomes hard, and the sandy or gravelous ground tends to fall when the sample is pulled up to the ground.
However, as a result, the thickness of the penetrating pipe becomes thick and difficult to penetrate. Therefore, a “rotary double / triple pipe sampler” (JGS 1222, 1223) having an outer pipe for rotating and cutting the outside of the penetrating pipe. ) Etc. are used.
For hard ground, there is a “rotary single core tube sampler” in which metal or diamond bit is attached to a single pipe and the ground is cut into a cylindrical shape by rotary cutting. Among these, the sampling method directly related to the present invention will be described below.

Japanese Patent Application No. 1-161129 “Sampling method and device with built-in core catcher forced press-fitting device” and Japanese Patent Application No. 3-295922 “Method and device for sampling with built-in core catcher forced press-fitting device” are both rotary cutting. Then, the sample is taken into the sampler, and then the sample is prevented from dropping by bending the catcher part whose tip is processed into a saw-like or strip-like shape to the inside with a dedicated hydraulic jack.
A typical example is shown in FIG. A sampler head 2 is screwed and joined to the tip of the boring rod 1. The rotary cutting outer tube 17 is attached to this, and an arcuate cutting bit 21 is attached to the tip portion thereof.
The upper surface of the bit 21 is processed into an arc shape inclined inward. A sample storage tube (pressing transmission tube) 18 is inscribed in the outer tube 17, and its head is connected to a catcher operating piston 16 fitted in the outer tube 17.
Between the lower end of the pressure transmission pipe 18 and the upper surface of the bit 21, a catcher 20 whose lower side is processed in a saw-like shape is fitted. The sampler is lowered into the hole in the state of “before press-fitting” in FIG. 4, and the sample is taken into the sampler by coring to a predetermined length while rotating and cutting.
Next, when pressure water is injected from the pressure water pipe 14 for catcher operation into the hydraulic pressure chamber 15 and the pressure transmission pipe 18 is lowered by the piston 16, the catcher 20 is bent inwardly on the upper surface of the bit 21 and the lower end of the sample 19. By cutting and closing the sample by piercing the part, the mechanism prevents the sample from dropping (see “after press-fitting” in FIG. 4).

Japanese Patent Application No. 11-279160 “Granular Ground Core Barrel” shows a summary diagram in FIG. A sampler head 2 is screwed and joined to the tip of the rod 1.
A rotating cutting outer tube 17 having a flat bit 26 attached to the tip is connected to the sampler head 2.
A piston 25 with a valve is fitted to the tip of the outer pipe, and the ground is rotated while the high-concentration solution such as a water-soluble polymer is sealed in the lubricant (high-concentration solution) storage space 23 formed in the outer pipe 17. Then, the sample is taken into the storage space 23.
Since the volume of the polymer liquid taken in the sample is blocked by the high-concentration liquid check valve 22 attached to the sampler head 2, it is discharged from the high-concentration discharge valve 24 attached to the piston 25 and collected. The sample is discharged from the bit 26 to the outside of the sampler through the outer periphery of the sample and an annular slit formed inside the outer tube 17.
During this time, the polymer solution wraps and reinforces the sample, and can reduce friction with the outer tube 17, so that a high-quality sample can be collected. In addition, the surface of the bit 26 has a function of lowering the cutting heat while taking the moat.
Japanese Patent Application 1-161129 Japanese Patent Application No. 3-295922 Japanese Patent Application No.11-279160

In the technical background, the emphasis was mainly on the technology directly related to the invention. The main object of the invention is intended for loose to medium-hard viscous soil, sandy soil, fine gravel and the like that can be collected without cutting soil particles.
Therefore, it belongs to the penetration type sampling instead of the rotary cutting type, and the quality of the collected sample is aimed at extremely high quality.
The following is a list of issues with thin-walled pipe-type samplers with blade tips.
(1) The sample is compressed by friction between the inner surface of the penetration tube and the sample.
(2) The penetration becomes difficult due to the frictional resistance between the outer circumference of the penetration pipe and the ground.
(3) The sample is disturbed by the penetration of the cutting edge of the penetration tube.
(4) When the penetrating force increases, the sampler meanders due to deformation or buckling of the rod, resulting in disturbance.
(5) When the sampler is pulled up, the sample is disturbed and the sample is dropped due to root cutting at the lower end of the sample.
(6) Disturbance and drop due to vacuum pressure generated near the lower end of the sample when the sampler is pulled up.
(7) When the sampler is pulled up, the sample falls in the borehole or in the hole.

The means for solving the above seven problems will be described below.
(1) In order to reduce the friction between the inner surface of the penetration tube and the sample, a lubricant is applied to the outer peripheral surface of the sample while collecting the sample. Alternatively, a thin lubricating layer is provided to efficiently reduce friction.
(2) In order to reduce the frictional resistance between the outer peripheral surface of the penetrating pipe and the ground, a friction cutter is provided to apply a lubricant to the outer peripheral surface and make the outer diameter of the shoe slightly larger than the outer diameter of the press-fitting pipe.
(3) In order to reduce the disturbance of the sample due to the penetration of the cutting edge of the penetration tube, the cutting edge is an outer taper and the angle is 7 degrees or less.
(4) In order to prevent the sampler from meandering at the time of penetration, in addition to reducing the frictional resistance described above, a steady pipe having the same diameter as the sampler outer diameter is attached to the head.
(5) In order to eliminate sample disturbance and sample dropping due to tearing at the lower end surface of the sample, the tip end portion of the sample is cut with a saw-shaped core catcher that bends into a hemisphere by hydraulic operation to close the lower end portion of the sampler.
(6) In order to prevent turbulence and dropping due to the vacuum pressure generated near the lower end surface of the sample when the sampler is pulled up, it is cut off with a casing pipe.
(7) When pulling up the sampler, a foldable virtual hole is provided in the upper part of the hole in order to prevent the sample from falling in the hole or in the hole.

Claim 1 of the present invention incorporates (1) to (5) among the above-described solutions. The invention will be specifically described below in the order of the claims.
It is an intrusion type sampler. Specifically, taking advantage of each of the “hydraulic type sampler” shown in FIG. 1, the “core catcher forced press type” shown in FIG. 4, and the “lubricating fluid press type” shown in FIG. By combining and adding new functions, it is possible to collect higher quality samples.

As is clear from the above description, the present invention has the following effects.
The friction between the collected sample and the inner surface of the sample storage tube could be reduced by forming an annular thin lubricating layer formed on the peripheral surface of the sample with a highly lubricating fluid. As a result, the collected sample was compressed by friction. High quality samples could be collected without stress.
Since this lubricant is discharged to the outside of the outer pipe of the sampler and the pressure input is further reduced by the shoe with the friction cutter, the range of applicable ground has expanded. The cutting edge angle was specified so that the sample collected was not disturbed by the shoe penetration.

  At the same time that the sample is taken in by the penetration of the shoe, the friction is reduced while protecting the outer periphery of the sample with the lubricating liquid, and the lubricating liquid after use is discharged to the outside of the sampler to reduce the outer surface friction and reduce the penetration resistance of the sampler. Simultaneously implement measures to reduce friction, such as reducing the sample length, and when a sample of a specified length is taken in, the catcher is activated to prevent the sample from falling off. Could be done automatically.

  According to claim 2, meandering at the time of penetration of the sampler is eliminated, and deterioration of quality such as bending deformation is not seen in the sample. Further, according to claim 3, the outflow from the lower end of the sampler such as non-sticky silt or fine sand is eliminated.

Hereinafter, the present invention will be described in detail with reference to the best mode for carrying out the present invention shown in FIGS.

In the first preferred embodiment of claim 1 of the present invention shown in FIGS. 6 to 8, the difference from that shown in FIG. 1 is that the penetration tube 7 is a double tube, and the sample is placed inside as in FIG. That is, a storage tube (pressing transmission tube) 18 and a core catcher 20 are added.
Instead of the arcuate shoe 21 for rotary cutting shown in FIG. 4, the arcuate portion is minimized, and the shoe 27 dedicated to penetration with an outer taper angle of 7 degrees or less is used.
Further, the outer diameter of the sample taken into the sampler is slightly smaller than the inner diameter of the sample storage tube 18 (the inner diameter of the shoe is made smaller), and the shoe 27 is inserted into the penetration tube in order to reduce friction with the outer ground. A friction cutter slightly larger than the outer diameter of 7 is attached.
The fixed piston 9 in FIG. 1 is a simplified version of the valved piston 25 in FIG. 5, and a lubricant such as a polymer is sealed in the lubricant storage space 23, and the sampled sample volume is extruded from this. The diameter of the fixed piston 9 is slightly smaller than that of the sample storage tube 18 to replace the valve 24.
The outlet from the upper part of the lubricant is closed by attaching the piston 16 for operating the core catcher shown in FIG. 4 instead of the penetrating pipe head 5 shown in FIG.
The penetrating piston 4 is provided with a piston stopper 29 for inserting the umbilicus into the penetrating piston fixing hole 28 opened in the outer tube 6 (see FIG. 7), and stopping the penetrating piston from penetrating at a predetermined position, and hydraulic pressure. When the pressure in the chamber 11 rises to open the pressure actuated valve 30, actuating piston 16 is adapted to descend in a state of penetrating piston 4 is stopped.
As a result, the core catcher 20 is pressed against the upper surface of the shoe 27 through the sample storage tube 18 and the sample is cut while being bent inward to close the lower portion (see FIG. 8).
The major difference from FIG. 4 is that the rod 1 is fixed on the ground so as not to float, and then when the pressurized water is injected, the penetration pipe 7 is pressed by the hydraulic jack, and when the penetration depth reaches a predetermined depth, the penetration stopper 29 is removed. At the same time, the navel enters the piston fixing hole 28 provided in the pipe and automatically stops. At the same time, the water pressure rises so that the pressure operating valve 30 works, and the pressure water in the water pressure chamber 11 penetrates the penetrating piston 4 and operates as a catcher. This is to automatically perform a series of behaviors in which pressurized water enters the hydraulic chamber 31 and the catcher operating piston 16 is pushed down to automatically close the catcher 20.

Sampling is difficult to collect if the friction between the sample taken in the sampler and the inner surface of the sample storage tube is large, but the possibility of the sample falling off is small and the need for the catcher is not high.
Therefore, most conventional penetrating samplers are not equipped with catchers. The penetration pipes currently used are drawn steel pipes (brass, steel, stainless steel, etc.), and the inner surface is rough, and it is known that large friction acts, but usually no friction reduction treatment is performed. This is because it is known that the sample is disturbed if there is friction, but it is more problematic to drop the sample.
Even if the friction-reducing material tube or the friction-reducing surface processing is performed, there is no progress due to the reason that the effect is immediately reduced in the ground made of angular quartz sand particles or the like.

In the invention, the shoe, the sample storage tube, the outside of the penetration tube, etc. that generate friction in contact with the ground are coated with molybdenum disulfide using a special auxiliary tool, and a high-lubricant such as a polymer is added. It incorporates the formation of a lubrication zone that press-fits into the gap between the soil and the interface to thoroughly reduce friction and prevent ground disturbance.
This is possible because of the combination with catchers and other devices that can be collected without dropping the sample even if the friction is zero.

Claim 2 will be described (see FIG. 12). The present invention is intended to improve the quality of the sample by reducing the friction between the ground and the sampler, and the penetration force is smaller than that of a normal sampler of the same diameter, but a commonly used boring rod is Since it is a 40mm class, the meandering at the time of intrusion is not missed.
As shown in FIG. 12, the maximum value that can be inclined in the section from the shoe 27 to the sampler head 2 is when the head is attached to the hole wall.
On the other hand, if the anti-rest pipe is attached, the inclination angle becomes smaller as the section length becomes longer.
Therefore, a high-stiffness steady-state pipe 38 having the same diameter or larger than that of the sampler (close to the borehole diameter and the inner diameter of the hole-holding pipe) is rigidly contacted with the sampler head 2 to reduce the inclination when pushed.
The sampler is initially standing substantially vertically, but in order to prevent the rod 1 from bending and increasing the inclination angle as the indentation load increases, it is better that the bore diameter or bore diameter is closer to the outer diameter of the sampler.
Further, the longer the steady-rest pipe 38 is, the better. It is best to lengthen it to the ground as shown by the dotted line in FIG.
In very deep cases, it is a good idea to press the hole tube tip and incorporate the hole tube into the reaction force mechanism.

Claim 3 will be described (see FIG. 13). In the sampler of the present invention, since the catcher is forcibly operated, the sample does not fall, but it is desired that fine soil does not flow out near the water level in the hole near the hole opening.
This is because fine soil does not flow out unless the sampler is deeper than the water level in the borehole and the ascending speed is high, but the water pressure in the sampler is higher near the borehole surface. The soil can run out.
Therefore, a flexible hose is connected to the mouth pipe, or a hydraulic head pipe is connected with a flexible joint, and the sampler is vertically extended to a height that is higher than the sampler length. In this way, the sampler is taken out with the sample tube folded out at the top of the mouth tube, and the sample storage tube is pulled out, and the water level in the hose is gradually lowered after plugging at the top of the mouth tube, and the sample is placed with the sampler upright. There is a way to take it out.

In the second embodiment for carrying out the first aspect of the present invention shown in FIGS. 9 to 11, the outer pipe 6 corresponding to the cylinder portion of the hydraulic jack is attached to the sampler head 2 having the penetrating water passage 10 connected to the boring rod 1. configure the pressure chamber 11 is fitted penetration piston 4 sliding in a watertight, this penetration piston 4 penetration tube 7 of outer diameter smaller than the inner diameter of the outer tube 6 is connected, a sample storage tube inscribed thereto 18, a shoe 27 having an outer taper angle of about 7 degrees and an inner diameter slightly smaller than the inner diameter of the storage tube 18 is connected to the penetrating tube 7, and the upper surface of the shoe 27 and the sample storage tube 18 are connected. A saw-like downward catcher 20 having the same diameter and thickness is fitted in place of the sample storage tube, and the upper end portion of the storage tube 18 is joined to a catcher operating piston 16 having the penetration tube 7 as a cylinder. , In contact with the lower surface of the penetration for the piston 4, the shoe 27 positions the lubricant to the lubricant storage space 23 made in the fixed piston 9 of the same diameter as the shoe inner diameter is set is sealed.

The fixed piston 9 has a piston fixing rod 3 at the center and is rigidly connected to the sampler head 2. On the outer periphery of the rod, a catcher operating tube 37 that slides in a watertight manner with respect to the penetrating piston 4 is joined to the fixed piston 9 at one end and to the sampler head 2 at the other end and connected to the penetrating water channel 10.
The circuit switching tube 34 further to the outside which is connected to the penetration piston 4 of the actuating tube 37 slides with catcher actuating piston 16 and watertight, and a groove for connecting the switching waterway 33 of penetration for the piston 4 operates Although provided along the pipe 37, the lower end surface is watertight and slides.
The lower end portion of the working tube 37 is joined to a catcher actuating valve 36 consisting of a double tube with a bottom, and this valve 36 has a gap on the side in contact with the fixed rod 3 so that water pressure also acts on the lower surface of the valve 36. In general, the catcher operating hole 35 provided in the operating pipe 37 is stopped at the outer surface of the inner pipe of the valve 36 (state shown in FIG. 9).

The penetrating piston 4 and the catcher operating piston 16 are set closest to the sampler head 2, and the fixed piston 9 is at the position of the shoe 27. Lubricating liquid is injected into the lubricant storage space 23 from an injection hole / exhaust port provided in the fixed piston 9 (not shown) and sealed.
In this state, the lubricating liquid is quickly erected and inserted into the in-hole water so as not to leak from between the shoes 27.
When the sampler reaches the bottom of the hole, the boring rod 1 is fixed on the ground so as not to move up and down, and when pressure water is injected through the rod 1, the pressure water passes through the penetrating water channel 10 in the sampler head 2 and the hydraulic chamber 11. The sample is taken into the sample storage tube 18 while lowering the penetrating piston and press-fitting the shoe 27.
During this time, a lubricant such as a polymer concentrate having the same volume as that of the collected sample flows out from the annular slit between the fixed piston 9 and the sample storage tube 18, protects the outer peripheral surface of the sample, and forms an annular thin friction reducing zone. 27 is discharged from a lubricant discharge hole 32 provided in the upper portion of the belt 27, and is pushed out into an annular slit outside the penetration tube 7 made by friction cutting of the shoe 27, thereby reducing the friction.

As shown in FIG. 10, the catcher operation switching pipe 34 connected to the fixed piston 9 is lowered by the penetration of a predetermined length, and the pipe upper end portion outside the circuit switching valve 36 set in the fixed piston 9. In this case, by lowering the entire switching valve, the penetrating water channel 10, the operating pipe 37, the catcher operating hole 35, the groove inside the catcher operating switching pipe, the catcher operating water channel 33 and the catcher operating water pressure chamber 31 are connected, and the catcher operating The piston 16 descends, and the saw blade of the catcher 20 is bent inwardly on the upper surface of the shoe 27 through the sample storage tube 18 to penetrate the sample to prevent dropping (state of FIG. 11).

  As described above, a sampler filled with a lubricant is set at the bottom of the hole, anchored on the ground, and then injected to the rod by simply injecting pressurized water, and during that time, the friction acting on the sample is reduced, It is a sampler that features a mechanism that takes in high-quality samples by reducing the penetration force, and automatically operates the catcher to prevent the sample from falling.

In recent years, more and more advanced ground and foundation analysis has become possible. In addition, instead of analysis and design based on uniform standards and guidelines, economic design that focuses on individual importance and safety is desired.
For this purpose, it is desired to collect high-quality samples from the ground, conduct advanced tests, and obtain the constants of individual grounds.

Sectional drawing of the hydraulic type sampler of the state which accommodated the penetration pipe. Sectional drawing of the hydraulic type sampler in the state where the penetration pipe is operating. Sectional drawing of the hydraulic type sampler in the state where the penetration pipe protruded. Core catcher forced press-fitting sampler principle diagram. Granular ground core barrel (highly concentrated lubricating fluid injection type sampler) principle diagram. BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view of the state which the penetration pipe of the best 1st form for implementing this invention act | operates. The longitudinal cross-sectional view of the state which the penetration pipe of the best 1st form for implementing this invention protruded. The longitudinal cross-sectional view of the state which the catcher of the best 1st form for implementing this invention act | operated. The longitudinal cross-sectional view of the state which the penetration pipe of the 2nd form for implementing this invention act | operates. The longitudinal section of the state where the penetration pipe of the 2nd form for carrying out the present invention projected. The longitudinal section in the state where the catcher of the 2nd form for carrying out the present invention operated. Explanatory drawing of a steady tube. Explanatory drawing of a virtual hole.

1: Boring rod, 2: Sampler head,
3: piston fixing rod, 4: piston for penetration,
5: Penetration pipe head, 6: Outer pipe,
7: penetration tube, 8: sample storage space,
9: fixed piston, 10: penetrating waterway,
11: Water pressure chamber, 12: Sample storage drain hole,
13: Drainage hole for stopping penetration,
14: Pressure water pipe for catcher operation,
15: Hydraulic chamber, 16: Piston for catcher operation,
17: Outer tube for rotary cutting, 18: Sample storage tube,
19: Sample, 20: Catcher
21: Arc-shaped cutting bit, 22: Highly concentrated liquid filled check valve,
23: Lubricant storage space, 24: Lubricant discharge valve,
25: Function added tip piston, 26: Flat bit,
27: shoe, 28: penetration piston fixing hole,
29: Piston stopper, 30: Pressure operated valve,
31: Catcher operating water pressure chamber, 32: Lubricant discharge hole,
33: Catcher operating water channel, 34: Catcher operating switching pipe,
35: Hole for catcher operation, 36: Circuit switching valve,
37: Working tube, 38: Upper end of steadying tube,
39: Virtual water level in the hole,
40: Flexible hose or head tube,
41: Flexible joint, 42: Hole retaining tube.

Claims (3)

Attach the sampler head to the tip of the boring rod, to which fit the penetration piston sliding in a watertight the outer tube to be connected, this penetration piston penetration tube of the outer tube diameter smaller than the outer diameter is connected, it inner It consists of a double tube with the sample storage tube in contact with it, and a shoe with an outer taper angle of about 7 degrees and an inner diameter slightly smaller than the inner diameter of the storage tube is connected to the penetration tube at the tip, and between the shoe upper surface and the sample storage tube Instead of a storage tube, a saw-like downward catcher with the same diameter and thickness is fitted, and the upper end of the storage tube is joined to the catcher operating piston with the penetration tube as a cylinder and is in contact with the lower surface of the penetration piston, at the shoe position. Is filled with a lubricant in the space created by setting a fixed piston with the same diameter as the shoe inner diameter. The fixed piston has a piston fixing rod in the center and operates a catcher. The sampler that penetrates the center of the piston and penetrating piston in a watertight and slidable manner and is coupled to the head is lowered to the sampling depth, fixed on the ground so that there is no vertical movement of the rod, and pressurized water is applied to the rod. When injected penetration piston and catcher actuating piston through the water passage in the head are simultaneously extruded downward, shoe penetrate the hole bottom ground, the sample enters the sampler, lubricants of the volume fraction is fixed The sample is extruded into the annular gap between the piston and the sample storage tube and discharged from the discharge hole in the upper part of the shoe, and when it penetrates for a predetermined length, the switching valve automatically operates and pressurized water flows between the penetration piston and the catcher operation piston. injected, catcher actuating piston is lowered by penetration piston is stationary, the beginning portion in the contact pressure of the serrated lower surface leading portion of the shoe upper and the catcher Stuck to the sample end to curve the side tumbled, intrusive soil sampling device, characterized in that it can be collected without dropping the sample. The angle of the sampler press-fit is reduced by rigidly contacting an anti-skid tube having a diameter equal to or larger than that of the sampler at the upper end of the sampler head and having a length longer than the sampler length or having a large bending rigidity to the ground. The intrusion-type ground sampling device according to 1. Pull up the sampler while water is in the water head tube connected to the holding hole pipe of the sampling hole with a flexible hose or flexible joint until it reaches the upper end of the sample to be collected. 2. The intrusion-type ground sampling device according to claim 1, wherein the sampler is taken out in a state of being bent and placed sideways.

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