JP2011236554A - Sampling device for pile hole infill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be able to collect a sample at the targeted depth position easily and securely by eliminating the possibility that a pile hole infill on the way to the targeted depth could be attached around the undersurface of a upper external cylinder and the top face of a lower external cylinder, and enabling operation only by the lifting performance of an operation bar.SOLUTION: When the undersurface 22 of a upper external cylinder 20 is nearly stuck to the top face 31 of a lower external cylinder 30 with a sampling port 10 of an internal cylinder 1 closed by the upper external cylinder 20, a sampling device 40 is lowered (a). Holding the internal cylinder 1 at the sampling position, an operation bar 15 is lifted from a ground to pull up only the upper external cylinder 20, and causes the sampling port 10 to open. Then a pile hole infill is taken in the internal cylinder 1. Next, the operation bar 15 is lifted to pull up the lower external cylinder 30, causing the sampling port 10 to close, and the sampling device 40 is lifted on the ground.

Description

  The present invention is to insert into a pile hole filled with fluid filler such as cement milk and soil cement, and to sample a part of the filler from the arbitrary depth and arbitrary position on the ground. It is related with the sampling device of the pile hole filling for the purpose.

  The foundation pile that supports the ground structure is configured by, for example, excavating a pile hole in the ground and burying a ready-made pile in the pile hole. In this case, the pile hole bottom is positioned on the support ground, and the root consolidation part at the bottom of the pile hole is filled with cement milk, etc., and the foundation pile is formed integrally with the root consolidation part and the ready-made pile. To bear the vertical support force. In this case, recently, the supporting force to be borne by one foundation pile has increased, and there has been a demand for a device that makes the solidification strength of the root-solidified portion stronger.

  Conventionally, in order to confirm the root solidified part, after the root solidified part is solidified, a method of collecting the root solidified part from the ground by core boring has been performed. However, although the strength can be confirmed when the core is collected, it is considered that the performance of the foundation pile itself from which the core was collected will be reduced by collecting the core, and the core cannot be collected until the solidified part is solidified. There were problems such as high cost for core boring.

  Therefore, if the sample is taken after the root-solidified portion is built and before the filler such as cement milk is solidified, the above problems can be solved, and the solidification strength can be confirmed in a shorter time.

  In this case, for example, there has been proposed a sampling device in which an outer cylinder that closes an inner window of a hopper that accommodates a sample is fitted (Patent Document 1). In this sampling device, the hopper was pressed against the bottom of the pile hole, the outer cylinder was slid against the spring, and the opening of the outer cylinder and the inner window of the hopper were aligned to collect the filling material. . Therefore, the sample near the pile hole that had the most influence on the solidification strength was reliably collected and recovered on the ground.

JP 2001-73360 A

  However, the conventional sampling device has a problem that the sampling position is limited to the vicinity of the bottom of the pile hole. In addition to the vicinity of the pile hole bottom, it was sometimes required to collect the filler from various positions in the pile hole.

  Further, in the conventional sampling device, the inner cylinder of the double cylinder and the opening of the outer cylinder are made to coincide with each other, and the sample is taken into the apparatus. Since the outer cylinder has an opening, depending on the soil, There was a possibility that a mud mass would adhere to the edge of the opening. When mud clumps adhere to the opening, depending on the soil, there is a possibility that a part of the adhering mud clumps may be taken in simultaneously with the sample (filling to be collected) depending on the sample. .

  Therefore, in the present invention, the upper outer cylinder and the lower outer cylinder that can be in close contact with the inner cylinder are slid, so that only the simple operation of lifting the upper outer cylinder and the lower outer cylinder is solved. Since the sample can be collected and sealed, the sample can be collected easily and reliably.

That is, according to the present invention, a sampling port is formed in an inner cylinder that can be sealed, and an upper outer cylinder and a height L _{2 of} height L ₁ are slidable in the axial direction across the sampling port in the inner cylinder. This is a pile hole filling device characterized in that it is constructed as follows and is constructed as follows.
(1) The outer surface of the lower end portion of the upper outer cylinder and the outer surface of the lower end portion of the lower outer cylinder are formed substantially flush with each other.
(2) The operation rods are arranged in parallel along the inner cylinder, and an intermediate portion of the operation rod is fixed to the outer surface of the upper cylinder.
(3) A locking projection through which the operation rod can be inserted is fixed to the outer surface of the lower outer cylinder, and the lower projection of the lower outer cylinder is regulated by locking the locking projection to the lower end of the operation rod. A locked portion is formed.
(4) In a state where the upper outer cylinder is raised with the operation rod and the locking projection and the locked portion are locked, the distance between the lower end of the upper outer cylinder and the upper end of the lower outer cylinder is L ₃ is formed.
(5) the axial length of the inner tube of the sampling port and L _0,
L ₀ <L ₁ , L ₀ <L ₂ , and L ₀ ≦ L ₃
It was.

Moreover, in the above, it is the collection apparatus of the pile hole filling characterized by being comprised as follows.
(1) When the lower end of the upper outer cylinder and the upper end of the lower outer cylinder are overlapped, the upper outer cylinder closes the sampling port, and in this state, a stopper is provided on the inner cylinder that restricts the lowering of the lower outer cylinder. .
(2) When the operating protrusion is raised by locking the locking projection and the locked portion, the lower outer cylinder closes the sampling port, and in this state, the upper outer cylinder and / or lower A stopper for restricting the rise of the outer cylinder was provided on the inner cylinder.

According to another invention, a sampling port is formed in a sealable inner cylinder, and an upper outer cylinder and a lower outer cylinder are attached to the inner cylinder so as to be slidable in the axial direction across the sampling port. It is a sampling method of a pile hole filling characterized by using the collection device to collect a filling from a pile hole as follows.
(1) The lower end of the upper outer cylinder and the upper end of the lower outer cylinder are substantially in close contact, and the outer surface of the lower end of the upper outer cylinder and the outer surface of the upper end of the lower outer cylinder are substantially flush. To do. In this state, the sampling port is closed with the upper outer cylinder, and the sampling device in this state is lowered from the ground into the pile hole.
(2) Subsequently, the inner cylinder is held at the sampling position, the upper and outer cylinders are raised, the sampling port is opened, and the pile hole filling is taken into the inner cylinder.
(3) When sampling is completed, the lower outer cylinder is raised to close the sampling port, and this state is maintained and the sampling device is pulled up to the ground.

  In the above description, the upper outer cylinder and the lower outer cylinder mean that they have a substantially cylindrical structure. In other words, the upper and lower cylinders are preferably cylindrical with the top and bottom open, but if they can be slid by being fitted to the inner cylinder and can close the sampling port, they can be slit vertically over the entire height. It is also possible to have a shape in which is formed. Further, the slit may be formed at a partial height, not over the entire height from the upper edge to the lower edge.

  In this invention, the sampling port is provided in the inner cylinder of the sampling device, and the upper and lower cylinders and the lower and outer cylinders are fitted. Therefore, the sample sampling port is opened and the sample (pile hole filling) is sampled. The sampling port can be closed with a cylinder or a lower outer cylinder. Also, the sampling port of the inner cylinder is closed by the upper outer cylinder or the lower outer cylinder, and in this state, the inside of the pile hole can be embedded with the lower surface of the upper outer cylinder and the upper surface of the lower outer cylinder being in close contact with each other. Until the sampling depth reaches, there is no possibility that the pile hole filling material having a depth in the middle adheres to the lower surface of the upper outer cylinder and the upper surface of the lower outer cylinder. Further, since the operation can be performed only by pulling up the operation rod, the operation rod can be easily and reliably operated without fear of loosening.

FIG. 1 shows a sampling device according to an embodiment of the present invention, wherein (a) shows a lowered state in a pile hole, (b) shows a sample-collected state, and (c) shows a device-recovered state.

(1) The sample collection port 10 is formed in the inner cylinder 1 that can be sealed, and the upper outer cylinder 20 and the lower outer cylinder 30 are fitted to the inner cylinder 1 so as to be slidable in the axial direction across the sample collection port 10. Thus, the collection device 40 is configured. Therefore, the upper outer cylinder 20 can move from the state in which the sample collection port 10 is closed to the position above the sample collection port 10 to open the sample collection port 10. The lower outer cylinder 30 is positioned below the sample collection port 10 and can move upward to block the sample collection port 10.
Further, the lower surface (lower end) 22 of the upper outer cylinder 20 and the upper surface (upper end) 31 of the lower outer cylinder 30 can be in close contact with each other, and in this state, the lower end portion of the upper outer cylinder 20 (the lower surface 22 and its vicinity). ) And the outer surface 33 of the lower end portion (the upper surface 31 and the vicinity thereof) of the lower outer cylinder 30 are substantially flush with each other. Accordingly, there is no step between the lower surface 22 of the upper outer cylinder 20 and the upper surface 31 of the lower outer cylinder 30 that are in close contact.

(2) Collect the filler from the pile hole as follows.
First, the upper outer cylinder 20 and the lower outer cylinder 30 are positioned vertically, and the upper outer cylinder 20 is sampled in a state where the lower surface 22 of the upper outer cylinder 20 and the upper surface 31 of the lower outer cylinder 30 are substantially in close contact with each other. The mouth 10 is closed (FIG. 1 (a)). The sampling device 40 in this state is lowered from the ground in the pile hole.
Next, the inner cylinder 1 is held at the sampling position, and only the upper and outer cylinders 20 are raised and positioned below the sampling port 10 of the lower outer cylinder 30 (held at the initial position). In this state, since the sampling port 10 is opened, the pile hole filling is taken into the inner cylinder 1.
Subsequently, when the sample collection is completed, the lower outer cylinder 30 is raised, the sample collection port 10 is closed, this state is maintained, and the collection device 40 is pulled up to the ground. In this state, the upper outer cylinder 20 is raised in conjunction with the lower outer cylinder 30 as long as it is positioned above the sampling port 10 (above the lower outer cylinder 30).
A sample (pile hole filling) is taken out from the inner cylinder 1 of the collection device 40 pulled up to the ground, and various conventional measurements and tests are performed.
Further, the raising operation of the upper outer cylinder 20 and the lower outer cylinder 30 as described above is performed, for example, by operating rods (operation rods 15) arranged in parallel on the outer surface side of the inner cylinder 1 from the ground.

1. Configuration of sampling device 40

(1) The connecting shaft portion 3 that connects the lower end portion of the excavation rod 42 from the ground is formed at the upper end of the main body portion 2 of the inner cylinder 1 whose outer surface is circular and sealed. A hemispherical lower end 4 having a diameter larger than that of the main body 2 is connected to the lower end of the main body 2 of the inner cylinder 1. The lower end portion 4 has a spherical surface 5 facing downward, and a step portion protruding in a ring shape (circumferential shape) from the outer peripheral surface of the main body portion 2 is a lower stopper 7 at a circular portion on the upper surface of the lower end portion 4.
Further, an upper stopper 8 is projected from the outer peripheral surface of the upper end portion of the inner cylinder 2. In addition, a sample collection port 10 is formed in the middle portion of the inner cylinder 1, and an intermediate stopper 9 is attached above the sample collection port 10. When the intermediate stopper 9 is pressed, the intermediate stopper 9 dies, and the tip is positioned about the outer peripheral surface of the inner cylinder 1. When the pressing is released, the intermediate stopper 9 protrudes from the outer peripheral surface of the inner cylinder 1 with a spring or the like.
In addition, an operation rod 15 made of a PC steel rod is arranged slightly parallel to the axis of the inner tube 1 at a distance from the outer peripheral surface of the inner tube 1, and a guide ring 12 through which the operation rod 15 can be inserted into the upper end portion of the inner tube 1 is provided. Project.

(2) The upper outer cylinder 20 and the lower outer cylinder 30 are slidably fitted to the main body 2 of the inner cylinder 1.
The lower surface 22 of the upper outer cylinder 20 and the upper surface 31 of the lower outer cylinder 30 are in contact with each other, and have a structure that can be adhered to the extent that mud does not enter. In this state, the outer peripheral surface 23 of the upper outer cylinder 20 and the outer peripheral surface 33 of the lower outer cylinder 30 are formed flush with each other (FIG. 1A). Further, an O-ring or the like is stopped between the lower surface 22 of the upper outer cylinder 20 and the upper surface 31 of the lower outer cylinder 30 without bringing the lower surface 22 of the upper outer cylinder 20 into contact with the upper surface 31 of the lower outer cylinder 30. A water material can be interposed to further strengthen the adhesion (not shown).
A fixing ring 25 protrudes from the outer peripheral surface 23 of the upper outer cylinder 20 to fix the fixing ring 25 and the operating rod 15, and the upper outer cylinder 20 moves up and down in conjunction with the vertical movement of the operating rod 15. To form.
Further, a locking ring 35 protrudes from the outer peripheral surface 33 of the lower outer cylinder 30, and the operation rod 15 is inserted into the through hole of the locking ring 35. Normally, the lower outer cylinder 30 does not move even when the operating rod 45 moves up and down, but the locked portion 16 provided at the lower end portion of the operating rod 15 contacts the lower surface of the locking ring 35. In this case, the locked portion 16 and the lower surface of the operation ring 35 are locked, and the lower outer cylinder 30 is moved together with the operation rod 15 ascending.

(3) When the axial length (height) L _{0 of} the sampling port 10 is assumed,
・ Axial length (height) L ₁ > L _{0 of the} upper outer cylinder
-Length (height) L ₂ > L _{0 in} the axial direction of the lower outer cylinder
Further, the operating rod 15 is raised, the connected upper and outer cylinders are also raised, and the locked portion 16 of the operating rod 15 is locked to the lower surface of the lower outer cylinder 30 locking ring 35 so that the operating rod 15 When the distance between the lower surface 22 of the upper outer cylinder 20 and the upper surface 32 of the lower outer cylinder 30 is L _{3 in} a state where the ascending and the lower outer cylinder 30 start to be interlocked (FIG. 1B),
The distance between the lower surface 22 of the upper outer cylinder 20 and the upper surface 32 of the lower outer cylinder 30 is L ₃ > L ₀
It is as.

(4) The collection device 40 is configured as described above (FIG. 1). Further, the relative position of the upper end of the operation rod 15 (even in various lengths when it is finally located on the ground) with the inner cylinder 1, that is, the excavation rod 42 to be used, can be seen. A mark (a horizontal line or the like) can be attached to the mark (not shown).

2. Collection method

(1) A pile hole is excavated by an arbitrary method, and a filler such as cement milk is filled in the pile hole (not shown).

(2) On the ground, the connecting shaft portion 3 of the sampling device 40 is connected to the lower end of the excavation rod 42. In this state, the lower surface 32 of the lower outer cylinder 30 is in contact with the lower stopper 7 and the lowering is restricted, and the lower surface 22 of the upper outer cylinder 20 is in contact with the upper surface 32 of the lower outer cylinder 30 and is in close contact with each other. (FIG. 1 (a)).
Further, in this state, the operation rod 15 is in the most down position, in a position where only the locking portion 16 a distance L ₃ below the locking ring 35 is lowered.
In this state, the inner surface of the upper outer cylinder 20 closes the sampling port 10, and the inner surface of the upper outer cylinder 20 presses the intermediate stopper 9. Further, the upper surface 32 of the lower outer cylinder 30 is located below the sample collection port 10.

(3) While maintaining the relative position of (2), the excavation rod 42 and the operating rod 15 are lowered, and the sampling device 40 is lowered in the pile hole (FIG. 1 (a)). When collecting the packing near the bottom of the pile hole, the depth of the pile hole may reach about 50 m. In this case, the drill rod 42 is lowered by a normal method, but at the same time, the operation rod 15 is Connect (not shown).
Moreover, since the lower end part 4 of the inner cylinder 1 of the sampling device 40 is a spherical surface 5, it can be lowered without disturbing the filler in the pile hole. Further, since the lower surface 22 of the upper outer cylinder 20 is in contact with and substantially adhered to the upper surface 32 of the lower outer cylinder 30, even if mud remains in the upper layer of the pile hole, etc. There is no possibility that an upper layer of the filler will adhere between the lower surface 22 of the cylinder 20 and the upper surface 32 of the lower outer cylinder 30 (FIG. 1A).

(4) When the sampling position in the pile hole is reached, the lowering of the excavation rod 42 is stopped, and the sampling port 10 of the sampling apparatus 40 is positioned at a sampling position such as the center of the pile hole or near the pile hole wall.
In this state, holding the drill rod 42 is increased as the operating rod 15 _{L 3} by arrow 44 (Figure 1 (b)). In response to an increase in operating rod 15, also the upper outer cylinder 20 rises as L ₃ only arrow 45, the lower outer cylinder 30 does not increase.
In this state, since the sample collection port 10 is exposed, the filling material is taken into the inner cylinder 1 from the sample collection port 10 (FIG. 1B). Further, in this state, since the lower surface 22 of the upper outer cylinder 20 hits the intermediate stopper 9 and the upper outer cylinder 20 is restricted from descending, the sample collection port 10 can be reliably exposed. It can be confirmed that the sampling port 10 is reliably exposed if the operation rod 15 is pushed down on the ground and the lower surface 22 of the upper outer cylinder 20 is in contact with the intermediate stopper 9 if the push-down is impossible. Moreover, the above-mentioned mark can also be confirmed on the ground.

(5) When the sampling of the sample is completed, when the operation rod 15 is further raised as indicated by an arrow 44, the upper outer cylinder 20 is also raised as indicated by an arrow 45. In addition, after the locked portion 16 is locked to the lower surface of the locking ring 35, the lower outer cylinder 30 is also lifted as indicated by an arrow 46 as the operating rod 15 is raised, and the lower outer cylinder 30 is moved. The sampling port 10 is closed (FIG. 1 (c)).
In this state, the upper surface 22 of the upper outer cylinder 20 comes into contact with the upper stopper 7 and is prevented from rising, and the upper surface 32 of the lower outer cylinder 30 is also moved to the intermediate stopper 9 (with the passage of the upper outer cylinder 20, The lower outer cylinder 30 is also restricted from rising (FIG. 1 (c)). Accordingly, if this state is maintained or the operating rod 15 is pressurized so as to be raised, the sampling port 10 is not opened.
Further, these series of operations are completed only by pulling the operation rod 15, so that an operation of depressing the operation rod 15 is unnecessary and a reliable operation can be performed (in the case of a PC steel rod, the length is long). There is a risk of loosening at 50m).

(6) While maintaining the state of (5), the excavation rod 42 and the operation rod 15 are raised to the ground, and the sampling device 40 is also raised to the ground (not shown).
After that, take the sample (cemented milk that is the filling of the pile hole) from the collection device 40 and perform necessary work such as visual observation of color, measurement of specific gravity and temperature, solidification and measurement of compressive strength. If necessary, fill the pile holes with the necessary materials supplementarily.
Moreover, after that, a ready-made pile is embed | buried in a pile hole and a foundation pile is constructed (not shown).

3. Other examples

(1) In the above embodiment, the inner cylinder 1, the upper outer cylinder 20, and the lower outer cylinder 30 each have a circular cross section, but the shapes such as a triangle, a square, and a hexagon are arbitrary. Moreover, if it can move to an axial direction in the state which the inner peripheral surface of both the outer cylinders 20 and 30 slid on the outer peripheral surface of the inner cylinder 1, the shape of the inner peripheral surface and outer peripheral surface of each cylinder 1,20,30 May have different shapes (not shown).

(2) In the above embodiment, the outer circumferential surface 23 of the upper outer cylinder 20 and the outer circumferential surface 33 of the lower outer cylinder 30 are formed to be flush with each other, but at least the lower surface 22 of the upper outer cylinder 20 and the lower outer cylinder 30 If the periphery of the portion in close contact with the upper surface 31 is flush and has no step, the outer peripheral surface 23 of the upper outer cylinder 20 is closer to the upper surface 21, and the outer peripheral surface 33 of the lower outer cylinder 30 is closer to the lower surface 32. The shape on the near side is arbitrary (not shown).

(3) In the embodiment, when the lower outer cylinder 30 contacts the intermediate stopper 9, that is, with the lower outer cylinder 30 blocking the sampling port 10, the lower outer cylinder 30 contacts the lower surface 32 of the lower outer cylinder 30. A second intermediate stopper 9a in contact therewith can also be provided (FIG. 1 (c), chain line shown 9a). Accordingly, the lower outer cylinder 30 is sandwiched by the intermediate stopper 9 and the second intermediate stopper 9a and the vertical movement is restricted, and the state in which the lower outer cylinder 30 blocks the sample collection port 10 can be maintained.
The second intermediate stopper 9a has the same structure as that of the intermediate stopper 9, and in the pressed state, the tip is located near the outer peripheral surface of the inner cylinder 1, and when the pressure is released, the tip is released from the outer peripheral surface of the inner cylinder 1. Protruding. Accordingly, in the state shown in FIGS. 1A and 1B, the lower outer cylinder 30 is pressed against the inner surface of the lower outer cylinder 30 and the lower outer cylinder 30 moves up and passes through the second intermediate stopper 9a. It protrudes to the lower surface 32 side.

(4) Moreover, in the said Example, although the intermediate | middle stopper 9 and the 2nd intermediate | middle stopper 9a were set as the structure which protrudes / decreases with the presence or absence of a press, it can also be set as the structure which always protruded (not shown). In this case, for example, a slit or the like through which the intermediate stopper 9 can pass when it is raised is formed in the upper outer cylinder 20, and the second intermediate stopper 9 a can be passed when it is raised in the lower outer cylinder 30. A slit or the like is formed (not shown).

(5) Moreover, in the said Example, although the operation rod 15 was extended to the ground along the outer side of the excavation rod 42, the operation rod 15 was bent above the inner cylinder 1 as a sample storage, The operation rod 15 can also pass through the hollow portion of the excavation rod 42 and reach the ground (not shown).

DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Inner cylinder main-body part 3 Inner cylinder connecting shaft part 4 Inner cylinder lower end part 5 Lower end spherical surface 7 Lower stopper 8 Upper stopper 9 Intermediate stopper 9a Intermediate stopper 10 Sample sampling port 12 Guide ring 15 Operation rod 16 Locked portion 20 of the operation rod Upper outer cylinder 21 Upper surface of the upper outer cylinder
22 Lower surface of upper outer cylinder 21 Outer surface of upper outer cylinder 25 Fixing ring 30 Lower outer cylinder 31 Upper surface of lower outer cylinder 32 Lower surface of lower outer cylinder 33 Outer surface of lower outer cylinder 34 Locking ring (locking protrusion)
40 Sampling device 42 Drilling rods 44, 45, 46

Claims (3)

Sampling port formed in the inner cylinder can be sealed to the inner cylinder, said axially slidably across the sample collection port, attaching the lower outer cylinder of the upper outer cylinder and the height L ₂ of the height L ₁ An apparatus for collecting pile hole filling, which is configured as follows.
(1) The outer surface of the lower end portion of the upper outer cylinder and the outer surface of the lower end portion of the lower outer cylinder are formed substantially flush with each other.
(2) The operation rods are arranged in parallel along the inner cylinder, and an intermediate portion of the operation rod is fixed to the outer surface of the upper cylinder.
(3) A locking projection through which the operation rod can be inserted is fixed to the outer surface of the lower outer cylinder, and the lower projection of the lower outer cylinder is regulated by locking the locking projection to the lower end of the operation rod. A locked portion is formed.
(4) In a state where the upper outer cylinder is raised with the operation rod and the locking projection and the locked portion are locked, the distance between the lower end of the upper outer cylinder and the upper end of the lower outer cylinder is L ₃ is formed.
(5) the axial length of the inner tube of the sampling port and L _0,
L ₀ <L ₁ , L ₀ <L ₂ , and L ₀ ≦ L ₃
It was. The pile collecting device for pile hole filling according to claim 1, which is configured as follows.
(1) When the lower end of the upper outer cylinder and the upper end of the lower outer cylinder are overlapped, the upper outer cylinder closes the sampling port, and in this state, a stopper is provided on the inner cylinder to restrict the lower outer cylinder from descending. .
(2) When the operating protrusion is raised by locking the locking projection and the locked portion, the lower outer cylinder closes the sampling port, and in this state, the upper outer cylinder and / or lower A stopper for restricting the rise of the outer cylinder was provided on the inner cylinder. A sampling port is formed in the inner cylinder that can be sealed, and the inner cylinder is slidable in the axial direction across the sample sampling port, using a sampling device that attaches an upper outer cylinder and a lower outer cylinder, A method for sampling a pile hole filling, wherein the filling is collected from the pile hole as follows.
(1) The lower end of the upper outer cylinder and the upper end of the lower outer cylinder are substantially in close contact, and the outer surface of the lower end of the upper outer cylinder and the outer surface of the upper end of the lower outer cylinder are substantially flush. To do. In this state, the sampling port is closed with the upper outer cylinder, and the sampling device in this state is lowered from the ground into the pile hole.
(2) Subsequently, the inner cylinder is held at the sampling position, the upper and outer cylinders are raised, the sampling port is opened, and the pile hole filling is taken into the inner cylinder.
(3) When sampling is completed, the lower outer cylinder is raised to close the sampling port, and this state is maintained and the sampling device is pulled up to the ground.

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