JPH0355674Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is used in geological boring surveys to investigate the geological conditions of underground clay layers, silt layers, etc.
This invention relates to a sample collection device that can reliably collect even a small amount of sample.

(Prior art) In general geological boring surveys, as shown in Fig. 12, the main body 2 of the sampling device is connected to a connecting pipe into a bore hole 1 drilled by an excavator to the sample sampling position. At the same time, a sample 5 as shown in FIG. ~
5e's lamination state and compaction degree are detected. By the way, when the sample sampling tube 2a is pushed into the bottom of the excavation hole 1, the tip of the sample sampling tube 20 may come into contact with hard soil such as rock or a support layer, making it impossible to push it any further. . In this case, only a small amount of sample 5 is collected in the sample collection tube 2a, but even that small amount of sample 5 is useful. Therefore,
There are cases where it is desired to pull up the sample collection cylinder 2a as it is and obtain the sample 5 inside it. However, since the sample 5 is small, the vacuum effect on the sample 5 by the sample sampling cylinder 2a is small, and if even a small impact is applied, the sample 5 will fall from within the sample sampling cylinder 2a.

In the conventional sample collecting device, the sample collecting cylinder 2a is not fixed midway. Therefore, when the sample collection tube 2a is pushed out only halfway as described above, the sample collection tube 2a is not pulled up together with the device main body 2, and the device body 2 is pulled up to a certain extent and the sample collection tube is pushed out. From the moment 2a reaches its lowest point,
The sample collection cylinder 2a is pulled up together with the main body 2 of the apparatus. Therefore, the sample 5 in the sample collecting cylinder 2a may fall due to the impact when the sample collecting cylinder 2a is lowered to its lowest position, resulting in a failure in sample collection.

(Problems to be Solved by the Invention) In view of the above-mentioned conventional technology, the present invention fixes the sample sampling tube to the main body of the apparatus to prevent impact from being applied to the sample even if the amount of pushing of the sample tube is small. The object of the present invention is to provide a sample collection device for geological boring surveys that can reliably collect even a small amount of sample.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a connecting pipe for sequentially feeding the device body 12 into the excavation hole 1 and supplying pressurized water into the device body 12. 10
The head cover 1 is attached to the device main body 12 connected to the
4, an outer cylinder 16 which is a cylinder tube extending downward from the outer periphery of the head cover 14, and an outer cylinder 16 which is concentric with the outer cylinder 16 and protrudes from the center of the head cover 14 over almost the entire length of the outer cylinder 16. In a sample collecting device for geological boring surveys, which is equipped with a central shaft 17 and a guide block 18 fixed to the lower end of the central shaft 17, two pistons 19 and 20, upper and lower, are placed inside an outer cylinder 16 and are connected to the central shaft 17. A sample collection tube 6 is provided which can be freely raised and lowered along the lower piston 17, extends downward from the lower piston 20, and whose lower end faces outward through the gap between the outer tube 16 and the guide block 18. The cylinder chamber 22 between the cylinder chamber 22 and the head cover 14 is communicated with the pipe line 10a of the connecting pipe 10 through a passage 23 penetrating the head cover 14, and between both pistons 19 and 20, the lower piston 20 is normally aligned with the center shaft 17. However, when the upper piston 19 is lowered by pressurized water in the cylinder chamber 22, a clutch device 21 is provided which is pushed to release the lock of the lower piston 20. It is something.

(Embodiment) As shown in FIG. 10, the schematic structure of the present invention is that the device is provided with a device main body 12 of a sample collecting device and a connecting pipe 10 that is sequentially connected to the main body 12 of the sample collecting device. The main body 12 has the following structure. That is, as shown in FIG. 1, a connecting pipe 15 to the connecting pipe 10 is provided at the upper end of the uppermost head cover 14, and a cylinder tube 16, which is an outer cylinder extending downward, is attached to the outer periphery of the head cover 14. At the same time, a hollow central shaft 17 is provided at the center of the head cover 14 and extends over almost the entire length of the cylinder tube 16, and a guide block 18 is fixed to the lower end of the central shaft 17. Inside the cylinder tube 16, an upper piston 19 corresponding to the head cover 14 side and a lower piston 20 located below it are provided. A clutch device 21 is provided between the upper and lower pistons 19, 20, the function of which will be described later. The cylinder chamber 22 facing the upper piston 19 is a passage 2 provided in the head cover 14.
3, and the lower piston 20 has a sample collection cylinder 6, which is an inner cylinder that extends downward from its outer circumference, connected to a screw 24.
Installed by.

The upper clutch mechanism 21 includes a receiving ring 26 that is screwed to the upper part of the lower piston 20 and has a first tapered surface 25 on its inner peripheral surface.
The first
A sliding ring 29 (see FIG. 4) having a second tapered surface 27 facing the tapered surface 25 and forming one crack 28, and urging the sliding ring 29 upward. The second spring 31 is provided on the receiving ring 26 and urges the upper piston 19 upward, and the urging force of the second spring 31 is greater than that of the first spring 30. It consists of a smaller structure.

Pressure water is forced into the cylinder chamber 22 from the conduit 10a of the connecting pipe 10 through the passage 23, but when the pressure water is fed under pressure, it slides as shown in FIG. The ring 29 is pressed against the first tapered surface 25 of the receiving ring 26 under the pressure of the first spring 30, and as a result, the sliding ring 29
The upper piston 1 is engaged with the central shaft 17 with a so-called clutch device 21 inserted therein.
9 is locked to the central shaft 17 via the second spring 31 of the clutch device 21. When pressurized water is introduced into the cylinder chamber 22, as shown in FIG. 30, and as a result, the sliding ring 29 is released from the pressing action of the tapered surface 25 of the receiving ring 26, so that its inner diameter expands and the so-called clutch device 21 is disengaged. Pushed by the upper piston 19, the lower piston 20 integrally formed with the clutch device 21 also descends, and the sample collection cylinder 6 attached to the piston 20 digs into the soil W to be sampled.

At this time, the air between the descending lower piston 20 and the guide block 18 in the fixed position passes from the air vent hole 32 through the hollow part 17a of the central shaft 17 as shown by the arrow, and pushes the check valve 33 open. The air is discharged to the outside from the air vent hole 34 on the upper side, and similarly, the lower piston 20 is also provided with an air vent passage 35 with a check valve through which air escapes downward. Furthermore, 36 is the upper piston 19
This is a stopper that regulates the upper limit position.

Next, the structure of the connecting pipe 10 will be described in detail with reference to FIG.
a male threaded portion 15a formed on the outer periphery of one end;
It consists of an engaging protrusion 15b protruding from the end face of one end, and a connected part 37 at the other end on the opposite side.
The connected portion 37 includes a sleeve nut 37a screwed into the outer periphery of the other end, an engagement recess 37b drilled in the end face of the other end, and further formed on the inner periphery of the end of the sleeve nut 37a. female threaded part 37
c, and a guide pipe 3 protruding from the center of the other end.
It consists of 7d.

Therefore, in order to sequentially connect the connecting pipes 10, as shown in FIG.
This fits into the guide pipe 37d of the connected part 37 of the adjacent connecting pipe 10, and engages the engagement protrusion 15b of the connected part 10 with the engagement recess 37b of the connected part 37, thereby causing the second As shown in Fig. 10, confirmation marks (consisting of scribed lines, stamped lines, printed lines, etc.) 11, 1 are connected to each other without displacement in the circumferential direction and are formed on the outer peripheral surfaces of the connecting pipes 10, 10.
1 is regulated so that it is in a straight line, and then,
By screwing the female threaded portion 37c of the sleeve nut 37a into the male threaded portion 15a, both connecting pipes 10,
10 are firmly connected.

Furthermore, the structure of the sample collection tube 6 will be explained in detail with reference to FIGS. 7 to 9. It is made up of a cylindrical body with an inner diameter of 75 mm and a length of about 650 mm, with a V-shaped groove extending over almost the entire vertical direction. A transfer portion 9 is formed, and its lower edge 6
A is pointed for digging, and a screw hole 6b for attachment and detachment is provided at its upper end.

In the overall view shown in FIG.
A mark 13 is provided on the outer circumferential surface of the device body 12 to confirm the direction of the device main body 12 (one fixed direction, east, west, north, south, etc.). The direction is made to match the direction of the mark 11 of 10. Incidentally, reference numeral 4 denotes a drilling machine for supporting the connecting pipe 10 in a vertical state and sending it underground.

To explain the operation method, as shown in FIG. 10, first, the chuck tube 38 provided in the drilling machine 4 is raised by the hydraulic cylinder 39, and the connecting pipe 10 is inserted into the inside of the chuck tube 38. As shown in FIG.
b, and the sleeve nut 37a is engaged with the male threaded portion 15a of the connecting portion 15.
By screwing them in, as shown in FIG. 10, the confirmation marks 11 and 13 provided on the outer peripheral surfaces of the connecting pipe 10 and the device main body 12 are aligned and connected. In this case, the 10th
As shown in the figure, it is necessary to make the transfer part 9 of the sample collection cylinder 6 and the confirmation mark 13 of the apparatus main body 12 coincide with the polymerization state in advance. If the confirmation marks 11 and 13 provided on are located in a predetermined direction from the axis center, for example, on the north side, then the transfer portion 9 of the sample collection cylinder 6 is also located on the north side. In FIG. 1, a pin 40 is provided at the lower end of the cylinder tube 16, which is an outer cylinder, so as to be engaged with the V-groove of the transfer part 9. Care is taken to prevent misalignment between the portion 9 and the confirmation mark 13 on the device body 12.

Next, the connecting pipe 10 is lowered and the device main body 12 is inserted into the excavation hole 1, and the connecting pipes 10, 10 are sequentially moved until the confirmation marks 11, 11 are the same as described above until the device main body 12 reaches the sample collection position. The sample collection tube 6 and the cylinder tube 1 are connected in a straight line until they reach a predetermined depth.
When the tip edge of the connecting pipe 1 reaches the position of the sampled soil W (Fig. 1), the water pressure pump 41 is activated and the connecting pipe 1
By introducing pressure water into the cylinder chamber 22 of the apparatus main body 12 through the pipe line 10a of 0, the sample collection tube 6 digs deeply into the soil W to be sampled, as shown in FIG. When the lower piston 20 comes into contact with the guide block 18 in the fixed position, the water pressure pump 41 stops pumping the pressure water, and the connecting pipe 10 is successively pulled up to remove the sample 7 collected from the sample collection cylinder 6. By taking out the sample 7, since the transfer part 9 of the sampling tube 6 is always provided on the predetermined side, the transfer part 9 is attached to the sample 7 as shown in FIG.
A V-shaped groove-shaped transfer area (mark) 8 is transferred by
is always formed in a predetermined direction, for example, on the north side, and as a result, the strata 7a to 7 appearing in the sample 7
It is possible to accurately detect in what direction d is displaced with respect to the north landmark 8.

As mentioned above, when the clutch device 21 is disconnected by the pressing force of the pressurized water and the sample collection tube 6 is lowered,
If the lower edge 6a of the sampling cylinder 6 hits hard soil such as rocks or a supporting layer during its descent, and it is impossible to dig any further, the clutch device is activated by stopping the supply of pressurized water at that point. 21 is inserted (state in FIG. 3), the lower piston 20 is locked to the central shaft 17, and the sample collection cylinder 6 attached to the piston 20 can be pulled up without shaking in the axial direction. In this case, if the above-mentioned clutch device 21 is not provided, even if the supply of pressure water is stopped, the lower piston rod 20 will be pushed against the guide block 18 by its own weight when pulling up.
The specimen descends until it comes into contact with the specimen cylinder 6, and a vacuum suction force is generated within the specimen collection tube 6, causing the specimen to stagnate, making it impossible to accurately detect the strata and degree of consolidation.

(Effects of the invention) According to the invention, when the sample collection cylinder is pushed into the soil to be sampled, the tip of the sample collection cylinder butts against hard soil such as rocks or the supporting layer, making it difficult to push each part further. Even if this is not possible, when the pressure of the pressurized water to the upper piston disappears, the lower piston is fixed to the central shaft by the action of the clutch device, and the main body of the device can be pulled up to the ground in this state, and the lifting process is Finally, since the lower piston does not fall down and cause an impact, the sample can be reliably obtained even if the sample in the sample collection cylinder is small.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of one embodiment of the present invention;
3 is an enlarged longitudinal sectional view of the clutch device, which is the main part of the embodiment of the present invention, FIG. 4 is a perspective view of the sliding ring, which is the main part of the device, and FIG. 5 is a front view of the same working state. 6 is an enlarged vertical sectional view of the connecting pipe, which is the main part of the embodiment of the present invention, FIG. 7 is a front view of the sampling tube, which is the other main part of the embodiment of the invention, Figure 9 is a plan view of the same, Figure 9 is a longitudinal sectional front view of the same, Figure 10 is a schematic diagram showing the usage state of the embodiment of the present invention, Figure 11 is a perspective view of a sample collected by the embodiment of the present invention,
FIG. 12 is a schematic explanatory diagram showing the usage state of the conventional example;
FIG. 13 is a diagram showing a stacked state of samples collected by the conventional example. 6... Collection tube, 10... Connection tube, 12... Device main body, 14... Head cover, 16... Cylinder tube, 17... Center shaft, 18... Guide block, 19... Upper piston, 20... ... lower piston, 21 ... clutch device, 22 ... cylinder device, 23 ... passage.

Claims (1)

[Scope of utility model registration request] The device body is connected to a connecting pipe for sequentially sending the device body into the excavation hole and supplying pressurized water into the device body.The device body has a head cover and an outer cylinder that is a cylinder tube that extends downward from the outer periphery of the head cover. A geological structure comprising a central shaft protruding from the center of the head cover concentrically with the outer cylinder and spanning almost the entire length of the outer cylinder, and a guide block fixed to the lower end of the central shaft. In a sample collection device used in a boring survey, two pistons, an upper and a lower one, are installed in an outer cylinder so that they can move up and down along the central axis, and the piston extends downward from the lower piston so that its lower end is located between the outer cylinder and the guide block. A sample collection cylinder is provided that faces outward from the gap, and the cylinder chamber between the upper piston and the head cover is communicated with the conduit of the connecting pipe through a passage that passes through the head cover. The piston is locked on the central axis, but when the upper piston is lowered by pressure water inside the cylinder chamber, a clutch device is provided that is pushed to release the lock on the lower piston. Sample collection device.