JPH0481038B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is useful for determining the compaction (strength), structure, and
This invention relates to a sampling device for investigating geological conditions such as layer facies in relation to changes in the horizontal direction underground.

(Prior art) In a general geological boring survey, as shown in Fig. 11, a drilled hole 1
The main body 2 of the sample collecting device is sequentially connected and inserted into the connecting pipe 3, and is press-fitted to the sample collecting position by the drilling machine 4.
A sample 5 as shown in FIG. 12 is taken from inside.

Conventional sample collection devices can detect the deposition status and compaction (strength) of various geological formations from the samples collected by the device, specifically, the sample collection tube as described below. The orientation of the layers 5a to 5e, for example the silt layer or the clay layer, is
As shown in A to D in the figure, it was not possible to detect in what direction the deposition state was changing.

(Problems to be Solved by the Invention) In view of the above-mentioned prior art, the present invention is directed to a geological boring survey in which it is possible to accurately detect in which direction the strata are changing based on the collected sample. The purpose is to provide a sample collection device.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a connecting pipe 10 which is successively added and connected, a device main body 13 connected to the connecting pipe 10, and a free device connected to the device main body 13. It consists of a rotatably supported sample collection cylinder 6 and an excavation outer cylinder 12 that is coaxial with the outer peripheral side of the sample collection cylinder 6 and is attached to the apparatus main body 13. a passage 14 for communicating with the pipe line 10a of No. 10 and spouting pressure water to the outside from between the sampling cylinder 6 and the outer cylinder 12;
4. A valve body 15 that is located midway and is moved upward by the pressure of pressure water, and a device main body 13 that is interlocked with the valve body 15.
and a connecting pin 16 that removably engages the sample collection tube 6, and the connecting tube 1 is successively added and connected.
0 and the device main body 13 connected thereto have a connecting part 17 and a connected part 18 that are always connected in a fixed position relationship without being displaced in the circumferential direction, and further, the sample collecting tube 6 has Sample 7 collected inside this
A configuration is adopted in which a transfer section 9 for transferring the mark 8 is provided on the connecting tube 10, and a confirmation mark 11 is provided on the connecting pipe 10 so that the direction of the transfer section 9 can be recognized.

(Example) As shown in FIG. 9, the schematic structure of the present invention is such that the main body 13 of the sample collecting device and the connecting tube 10 connected to the main body 13 in sequence are attached to the outer circumferential surfaces of the main body 13 of the sample collecting device. Marker 11, 1 for confirming the direction (any fixed direction within a 360° range such as north, south, east, and west)
9 is provided, and a transfer portion 9 is also provided on the sample collection tube 6 provided in the apparatus main body 13 to transfer the mark of the sample sampled therein.
Incidentally, reference numeral 4 designates a drilling machine for vertically supporting the connecting pipe 10 and sending it underground.

The structure of the sample collection device will be described in detail with reference to FIG.
0, a spool 15 serving as a valve element that can freely slide up and down is provided inside, and the spool 15
A passage 14 is provided on both sides of the passage. That is, a first pressure water supply passage 20 communicating with the pipe line 10a of the communication pipe 10 was provided on the left side of the spool 15, and a second pressure water supply passage 21 was provided on the right side thereof, and the spool 15 was slid upward. Sometimes (FIG. 2), the first and second pressure water supply passages 20,
Communication holes 22 and 23 are provided at the upper ends of the spool 15 and the second pressure water supply passage 21 to communicate the spools 21 with each other. In addition, a connecting pin 16 is vertically slidably fitted in parallel to the second pressure water supply passage 21 and offset in the circumferential direction, and its upper end is connected to the spool 15 via a connecting rod 24. There is. Furthermore, an outer cylinder 12 for excavation that extends downward is provided on the outer circumferential portion of the device main body 13, and a hollow center shaft 25 that extends downward is also provided in the center of the device main body 13. An idler block 27 is attached to freely rotate through thrust and radial bearings 26, and is supported by a retaining nut 28. And idle block 2
7 is provided with an engagement hole 29 in which the connecting pin 16 protruding into the outer cylinder 12 engages, and on the other hand, the lower half outer circumference of the free rotation block 27 is provided with an engagement hole 29 extending downwardly.
An inner cylinder whose tip edge 6a projects slightly downward from the outer cylinder 12, that is, a sample collection cylinder 6, is attached with screws 30, and the vicinity of its lower end is attached to the inner peripheral surface of the outer cylinder 12 to form a ring-shaped body. 31 and is rotatably supported. Note that an air vent hole 33 is provided in the hollow portion 25a of the central shaft 25 through a check valve 32 to release the air inside the sample sampling tube 6 to the outside.

Therefore, pressure water is fed from the ground to the pipe line 10a of the connecting pipe 10 during sample collection, and the pressure water passes through the first pressure water supply passage 20 of the apparatus main body 13 and is fed to the pipe line 10a of the connecting pipe 10. As shown in FIG. 2, the spool 15 is pushed upward, and the communication holes 22 and 23 are brought together and the first and second pressure water supply passages 20 and 21 are switched to a communication state, so that the pressure water is Furthermore, it is sent out to the second pressure water supply passage 21,
As a result, the pressurized water is blown out from between the outer and outer cylinders 6 and 12 through the outer cylinder 12, thereby assisting the excavation work during sample collection. On the other hand, as the spool 15 moves upward, the connecting pin 16 also moves upward, and comes to escape from the engagement hole 29 of the idler block 27, releasing the engaged state between the two. ing. Its effect will be described later.

Next, the structure of the connecting pipe 10 will be explained in detail with reference to FIG.
A connecting portion 17 is provided at one end of the connecting portion 17.
is a male threaded portion 17a formed on the outer periphery of one end;
It consists of an engaging protrusion 17b protruding from the end face of one end, and a connected part 18 at the other end on the opposite side.
The connected portion 18 includes a sleeve nut 18a screwed into the outer periphery of the other end, an engagement recess 18b bored in the end face of the other end, and an inner periphery of the other end of the sleeve nut 18a. Formed female thread part 1
8c, and a guide pipe 18d protruding from the center of the other end.

Therefore, in order to connect the connecting pipes 10 one after another, as shown in FIG. As shown in FIG. )11,
11 are regulated so that they are aligned in a straight line, and then both connecting pipes 1 are screwed into the male threaded part 17a by screwing the female threaded part 18c of the sleeve nut 18a into the male threaded part 17a.
0 and 10 are firmly connected.

Further, the structure of the sample collection tube 6 is explained in detail with reference to FIGS. 5 to 7. It consists of a cylindrical body with an inner diameter of 75 mm and a length of about 650 mm, and has a V-shaped groove 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.

Furthermore, the structure of the ring-shaped body 31 attached to the inner periphery of the lower end of the above-mentioned excavation outer cylinder 12 will be explained with reference to FIG.
A circular surface 31a is formed so as to be rotatably in contact with the outer circumferential surface of the cylinder, and pressure water passage gaps 31b are formed at appropriate intervals on the outer circumferential side of the circular surface 31a. ), and by supporting the sample sampling tube 6 on the ring-shaped body 31, vibrations during excavation are prevented.

To explain the operation method, as shown in FIG. 9, first, the chuck tube 35 provided in the drilling machine 4 is raised by the hydraulic cylinder 36, and the connecting pipe 10 is inserted into the inside of the chuck tube 35. At the same time, the connecting portion 17 of the device main body 13 is connected to the guide pipe 18d of the connected portion 18 of the connecting pipe 10.
, the latter engaging protrusion 17b is fitted into the former engaging recess 18b, and the sleeve nut 18a is
By screwing into the male threaded portion 17a of the connecting portion 17, the confirmation marks 11 and 19 provided on the outer peripheral surfaces of the connecting tube 10 and the device main body 13 are aligned and connected. In this case, the first
As shown in the figure, the connecting pin 16 is connected to the free rotation block 2.
7, and at this time, the transfer portion 9 of the sample collection tube 6 attached to the free rotation block 27 and the outer tube 1 are transferred from the apparatus main body 13 as appropriate.
It is necessary to align the confirmation marks 19 provided on the connecting pipe 10 and the device body 13 in advance with the confirmation marks 19 provided on the connecting pipe 10 and the device main body 13 at a predetermined position from the axis center. For example, if it is located on the north side, the transfer portion 9 of the sample collection cylinder 6 is also located on the north side.

Next, the connecting pipe 10 is lowered and the device main body 13 is inserted into the excavation hole 1, and the connecting pipes 10, 10 are sequentially moved to the confirmation marks 11, 11 as described above until the device main body 13 reaches the sample collection position. When the predetermined depth is reached and the tip edge 6a of the sample sampling cylinder 6 in the device main body 13 has bitten into the sampled soil W (Fig. 1), the As shown in FIG. 9, the uppermost connecting pipe 10 is grasped by the chuck 37, and the water pressure pump 38 is then operated to supply pressurized water into the main body 13 of the apparatus through the conduit 10a of the connecting pipe 10. When the water is introduced, as shown in FIG. 2, the pressure water is ejected to the outside from between the sampling tube 6 and the excavation outer tube 15 to assist the excavation work, and also connects the connecting pin 16 of the device body 13 and the idler block. 27 is disengaged from the engagement hole 29. After that, the chuck tube 35 of the drilling machine 4 is connected to the prime mover 39.
By rotating and pressing downward with the hydraulic cylinder 36, the connecting pipe 10, which is naturally held by the connecting pipe 10, the device main body 13 at the lowest end thereof, and the excavating pipe attached thereto. Outer cylinder 12
In response to this, the sample collection cylinder 6 is supported by a bearing 26 on the main body 13 of the apparatus, more precisely, on its central shaft 25, through an idling block 27, and is freely rotatable. Tip edge 6a of sampling tube 6
Since it is biting into the soil W to be sampled and is under load, the device main body 13 and the outer cylinder 12 rotate, but the sample collection cylinder 6 does not rotate and only digs deeply into the soil W to be sampled. It is. Moreover, since the sample sampling tube 6 does not rotate all the time due to the disengagement with the connecting pin 16, the transfer portion 9 formed thereon is always directed in a predetermined direction. , for example, located north of the axis center.

Once a predetermined amount of sample has been collected into the sample collection cylinder 6, the operation of the rotary pressing means and the supply of pressurized water are stopped, and the connecting tubes 10 are sequentially pulled up to remove the sample 7 from within the sample collection cylinder 6. By taking it out, since the transfer part 9 of the sampling tube 6 is always provided on the predetermined side, as shown in FIG. The transferred portion (mark) 8 is always formed in a predetermined direction, for example, on the north side surface, so that it is possible to determine in what direction the strata 7a to 7d appearing on the sample 7 are displaced with respect to the north mark 8. It is possible to accurately detect whether

(Effects of the Invention) According to the present invention, since the rotating outer cylinder for excavation collects samples while digging, it is possible to reliably collect samples even if the soil to be sampled is hard. In addition, it is possible to not only detect the degree of compaction and soil type from the collected samples, but also to correlate the sedimentary state of the strata with horizontal changes underground, and to determine the internal structure of the geology, faults, and sedimentation. It is possible to accurately detect the directionality of curves, cracks, inclinations, etc., and thereby the design and construction conditions of aboveground or underground structures can be accurately set.
Furthermore, depending on the sample collected, it is possible to measure the direction of stress underground, the direction of fractures, or the direction of rock magnetism, which can be used in academic fields such as earthquake prediction, crustal stress, and paleomagnetism. It can be expected to have a significant effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of one embodiment of the present invention, and FIG.
The figure is a longitudinal sectional front view of the same working state, Fig. 3 is a longitudinal sectional front view of the connecting pipe which is the main part of the embodiment of the present invention, Fig. 4 is an enlarged longitudinal sectional front view of the main part, and Fig. 5 is the longitudinal sectional front view of the main part of the embodiment of the invention. A front view of the sample collection tube, which is another important part, FIG. 6 is a plan view of the same, FIG. 7 is a longitudinal sectional front view of the same, and FIG. A plan view, FIG. 9 is a schematic diagram showing the state of use of the embodiment of the present invention, FIG. 10 is a perspective view of a sample collected by the embodiment of the present invention, and FIG. 11 shows the state of use of the conventional example. A schematic explanatory diagram, FIG. 12, is a diagram showing a stacked state of samples collected by the conventional example. 6...Sample collection tube, 17...Sample, 8...Mark, 9...Transfer section, 10...Connecting pipe, 11...Confirmation mark (of the connecting pipe), 12...Outer cylinder for excavation, 1
3... Device body, 14... Passage, 15... Valve body (spool), 16... Connecting pin, 17... Connecting part, 18... Connected part, 19... Confirmation mark (of the device main body) .

Claims (1)

[Claims] 1. A connecting pipe that is connected in sequence, a device main body connected to the connecting pipe, a sample collecting tube rotatably supported by the device main body, and coaxial with the outer peripheral side of the sample collecting tube, the above-mentioned It consists of an excavation outer cylinder attached to the apparatus main body, and the apparatus main body has a passage that communicates with the conduit of the connecting pipe and squirts pressurized water to the outside from between the sampling cylinder and the outer cylinder. , having a valve body located in the middle of the passage and moved upward by the pressure of pressurized water, and a connecting pin that interlocks with the valve body and removably engages the device main body and the sample collection tube, The connecting pipe, which is successively added and connected, and the device main body connected thereto have a connecting part and a connected part that are always connected in a fixed position relationship without being displaced in the circumferential direction. The sample collecting device is provided with a transfer section for transferring a mark onto the sample to be collected inside the sample collection device, and a confirmation mark is provided on the connecting tube so that the direction of the transfer section can be recognized.