JPS63138095A - Sampling method and device in geological boring survey - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is useful for determining geological conditions such as the consolidation density (strength), structure, and facies of underground clay layers and silt layers when conducting geological boring surveys. This article relates to a sample collection method and device for investigating changes in the horizontal direction underground.

(Prior Art) In a general geological boring survey, as shown in FIG. 11, the main body 2 of the sampling device is sequentially connected to a connecting pipe 3 and inserted into a borehole l excavated by an excavator.
Test S! By press-fitting the sample 5 to the sample collection position using the machine 4, the sample 5 as shown in FIG.
I am trying to collect the following.

In the conventional sample collection method (device), the deposition state of various strata and consolidation 1. Although f (intensity) can be detected, the directionality of each layer 5a to 5e, for example,
As shown in (a) to (d) of FIG. 12, it was not possible to detect in what direction the deposition state of the silt layer or clay layer was changing.

(Problems to be Solved by the Invention) In view of the above-mentioned prior art, the present invention provides a method for collecting samples in geological boring surveys that allows accurate detection of the direction in which the strata are changing based on the collected sample. The purpose of the present invention is to provide a method and a device thereof.

(Means for Solving the Problems) In order to solve the above problems, the first aspect of the present invention is to provide a transfer section 9 for transferring the mark 8 onto the sample 7 collected in the sample collection cylinder 6, and A confirmation mark 11 is provided on the connecting pipe IO for pushing the sample collection tube 6 into the hole Hj, and the confirmation mark 11 is provided so that the orientation of the transfer portion 9 can be seen. an excavating outer cylinder 12 engaged in fixed position relationship with
Connecting pipes 10 are successively added through the connecting pipes 10, and while confirming the orientation of the transfer part 9 of the sample collecting cylinder 6 using the confirmation mark 11 provided on the connecting pipe IO, push the sampling cylinder 6 to the sample collecting position in the borehole 1. When the sampling position is reached, pressurized water is jetted outward from between the sample sampling cylinder 6 and the excavation cylinder 12, and the pressure of the pressure water causes the sample collection cylinder 6 and the excavation cylinder 12 to flow out. Release the engagement state with the excavating outer cylinder 12.
The outer cylinder 12 and the sample collection cylinder 6 are pushed out by the required amount into the soil to be sampled while rotating, and then the supply of pressurized water is stopped and the collection cylinder 6 is pulled up to the ground and taken out from the sampling cylinder 6. A configuration is adopted in which the directionality of the strata is detected by the marks 8 transferred to the side surfaces of the sample 7.

The second aspect of the present invention is a connecting pipe 10 that is successively added and connected, a device main body 13 connected to the connecting pipe 10, a sample collection cylinder 6 supported by the device main body 13 in a freely rotatable manner,
Coaxially on the outer peripheral side of the sample collection tube 6, the device main body 1
The device main body 13 is connected to the pipe line 10a of the connecting pipe 10 to eject pressurized water to the outside from between the sampling pipe 6 and the external pipe 12. a valve body 15 located in the middle of the passage 14 that is moved upward by the pressure of pressure water; and a valve body 15 that allows the device main body 13 and the sample collection tube 6 to be freely engaged and detached in conjunction with the valve body 15. The connecting pipe 10 which has an engaging connecting bottle 16 and is successively connected to the connecting pipe 10, and the device body 13 connected to the connecting pipe 10 include:
It has a connecting part 17 and a connected part 1B that are always connected in a fixed position relationship without being displaced in the circumferential direction, and furthermore, the sample collecting cylinder 6 has a mark 8 transcribed onto the sample 7 to be collected therein. A configuration is adopted in which a transfer section 9 is provided for the transfer, 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) The schematic structure that characterizes the present invention is as shown in FIG.
The orientation of the device body 13 (
In addition to providing landmarks 11.19 to confirm the direction (any fixed direction within a 360° range such as east, west, north, south, etc.),
3 is provided with a transfer section 9 for transferring the mark of the sample collected into the sample collection tube 6. Incidentally, reference numeral 4 designates a drilling machine for vertically supporting the connecting pipe 10 and sending it underground.

To explain the structure of the sample collecting device in detail with reference to FIG.
7, and a spool 1 which is a valve body that can freely slide up and down inside.
5, with passages 14 on both sides of the spool 15.
has been established. That is, a first pressure water supply passage 20 communicating with the pipe line 10a of the communication pipe IO is provided on the left side of the spool 15, and a second pressure water supply passage 21 is provided on the right side thereof, and the spool 15 slides upward. When (Figure 2)
A communication hole 22.23 that communicates the first and second pressure water supply passages 20.21 with each other is provided at the upper end of the spool 15 and the second pressure water supply passage 21. 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 connecting rod 24.
It is connected to the spool 15 via. 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. The free rotation block 27 is rotatably attached via thrust and radial bearings 26 (=1 piece, and is supported by a throat 28 to prevent removal.The upper end of the free rotation block 27 has an outer cylinder 12 An engagement hole 29 is provided in the lower half of the outer periphery of the free rotation block 27 in which the connecting pin 16 that projects inward engages. A protruding inner cylinder, that is, a sample collection cylinder 6 is attached with screws 30, and the vicinity of its lower end is rotatably supported by a ring-shaped body 31 attached to the inner peripheral surface of the outer cylinder 12. A sample collection cylinder 6 is inserted into the hollow part 25a of 25 through a check valve 32.
An air vent hole 33 is provided for discharging the air inside to the outside.

Thus, pressure water is forced into the pipe line 10a of the connecting pipe 10 from the ground at the time of sample collection, and the pressure water passes through the first pressure water supply passage 20 of the apparatus main body 13.
As shown in FIG. 2, push the spool 15 upwards,
As a result, the communication holes 22 and 23 are aligned, and the first and second
Since the pressure water supply passages 20.21 are switched to the communication state, the pressure water is further sent to the second pressure water supply passage 21,
As a result, the pressure water passes through the outer cylinder 12 and the inner and outer cylinders 6.
It is spouted out from between 12 and assists in excavation work when collecting samples. On the other hand, as the spool 15 moves upward, the connecting pin 16 also moves upward, and escapes from the retaining hole 29 of the free rotation block 27, releasing the engagement state between the two. . 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 pipe-like main body 10b having a length of about 20 m, and the connecting portion 17 has a male threaded portion 17a formed on the outer periphery of the one end, and an engaging portion protruding from the end face of the one end. A connected portion 18 is provided at the other end on the opposite side of the protrusion 17b. The engagement recess 18b drilled in the sleeve neck (1)
It consists of a female thread 18e formed on the inner periphery of the other end of 8a, and a guide pipe 18d protruding from the center of the other end.

Therefore, in order to sequentially connect the connecting pipes 1O, as shown in FIG. As shown in Fig. 9, the connecting pipes 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11. .11 is regulated so that it is in a straight line, and then the reconnection pipe 10.10 is screwed into the male threaded part 17a of the female threaded part 18c of the sleeve nand 18a.
It is designed to be strongly connected.

Further, the structure of the test sample 1 sampling tube 6 will be explained in detail with reference to FIGS. 5 to 7. The inner diameter is 751. It consists of a cylindrical body with a length of about 6501 mm, and a V-shaped groove-shaped transfer part 9 is formed over almost the entire vertical direction, the lower end edge 6a of which is sharpened for digging, and the upper end thereof has a screw for attachment and detachment. A hole 6b is provided.

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. It is formed in a circular surface 31a, and pressure water passage gaps 31b are formed at appropriate intervals on the outer circumferential side of the circular surface 31a, so that it is secured to a step 34 (FIG. 1) on the inner circumferential surface of the outer cylinder 12 for excavation. The sample collection tube 6 is supported by the ring-shaped body 31 to prevent vibrations from occurring during excavation.

To explain the operating method, first, as shown in FIG.
In the raised state, the connecting tube 10 is inserted into the inside of the chuck tube 35, and the connecting tube lO
The connecting portion 17 of the main body 13 of the device is fitted into the guide pipe 18d of the connected portion 18 of the former, the retaining protrusion 17b of the latter is fitted into the engagement recess 18b of the former, and the sleeve lug) 18a is inserted into the connecting portion 17. By screwing into the male threaded portion 17a, the confirmation marks 11 and 19 provided on the outer circumferential surfaces of the connecting pipe 10 and the device main body 13 are aligned and connected. In this case, as shown in FIG. from the transfer unit 9 and the device main body 13 as appropriate.
It is necessary to match the confirmation mark 19 provided on the outer cylinder 12 with the polymerization state in advance, so that the confirmation mark 11.1 provided on the connecting pipe IO and the device body 13
If the transfer portion 9 is 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.

Next, the connecting pipe IO is lowered to move the device body 13 into the excavated hole l.
until the device main body 13 reaches the sample collection position.
Sequentially, connect the connecting pipes 10 and 10 with the confirmation marks 11 as described above.
．． 11 are connected while regulating so that they are on the same straight line,
When the predetermined depth is reached and the tip edge 6a of the sample sampling tube 6 inside the device main body 13 bites into the sampled soil W (Fig. 1),
As shown in FIG. 9, the uppermost connecting pipe 10 is gripped by the chuck 37, and then the water pressure pump 38 is activated to supply pressurized water to the main body of the apparatus through the conduit 10a of the connecting pipe IO.
3, as shown in FIG. 2, the pressure water jets out 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. The engagement state of the idle block 27 with the engagement hole 29 is released. After that, V, attach the chuck tube 35 of the male plate 4 to the prime mover 3.
9 and the hydraulic cylinder 36 while rotating and pressing downward, the connecting pipe 10 is held by the connecting pipe 10, the device body 13 at the lowest end thereof, and the excavating outer cylinder 12 attached to this. In contrast, the sample collection cylinder 6 is supported by a bearing 26 on the main body 13 of the apparatus, more precisely, on its central axis 25, through an idling block 27, so that the sample collection cylinder 6 can freely rotate. Since the tip edge 6a of the sample collecting tube 6 digs into the soil W to be sampled and is under load, although the main body 13 and the outer tube 12 rotate, the sample collection tube 6 does not rotate and remains inside the soil W to be collected. In addition, the sample collection cylinder 6 is formed in this way because it does not rotate constantly when the engagement with the connecting pin 16 is released. The transfer section 9 is always located in a predetermined direction, for example, north of the axial center.

And sample collection ilI? When a predetermined amount of sample has been collected in i6, the operation of the rotary pressing means and the supply of pressurized water are stopped, and the connecting pipe IO is sequentially pulled up to take out the sample 7 from the sample collecting cylinder 6. The collection tube 6
Since the transfer unit 9 of 10 is always provided on the predetermined side,
As shown in the figure, a V-shaped groove-shaped transfer portion (mark) 8 is always formed on the sample 7 in a predetermined direction, for example, on the north side surface, which is transferred by the transfer unit 9, and thereby the sample 7
The strata 78 to 7d appearing in are based on the marker 8 on the north side,
It is possible to accurately detect in what direction the object is being displaced.

(Effects of the Invention) According to the present invention, since the rotating outer cylinder for excavation collects the sample while digging, it is possible to reliably collect the sample even if the soil to be sampled is hard. In addition to simply detecting the degree of compaction and type of soil from collected samples, it is also possible to correlate the sedimentary state of the strata with horizontal changes in the ground, and to investigate the internal structure of the geology, faults, and folds. It is possible to accurately detect the directionality of cracks, inclinations, etc., and thereby to accurately set design and construction conditions for above-ground or underground structures. Furthermore, depending on the sample collected, the direction of stress and cracks in the underground,
It is also possible to measure the magnetic direction of rocks, and this can be expected to have significant effects in academic fields such as earthquake prediction, crustal stress, and geomagnetism.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of an embodiment of the present invention, Fig. 2 is a longitudinal sectional front view of the same working state, Fig. 3 is a longitudinal sectional front view of a connecting pipe which is the main part of the embodiment of the invention, and Fig. 4 is Enlarged longitudinal sectional front view of the same main part,
FIG. 5 is a front view of a sample collection cylinder which is another essential part of an embodiment of the present invention, FIG. 6 is a plan view of the same, FIG. 7 is a longitudinal sectional front view of the same, and FIG. 8 is used in an embodiment of the present invention. FIG. 9 is a schematic view showing the state of use of the embodiment of the present invention, FIG. 1θ is a perspective view of a sample collected by the embodiment of the present invention, and FIG. FIG. 12 is a schematic explanatory diagram showing the state of use of the conventional example, and FIG. 12 is a diagram showing the stacked state of samples collected by the conventional example. 6... Sample collection tube, 17... Sample, 8... Marker,
9...Transfer part, lO...Connecting tube, 11...Confirmation mark (of connecting tube). 12...Excavation cylinder, 13...Device main body, 14...
- Passage, 15... Valve body (spool), 16... Connecting bottle, 17... Connecting part, 18... Connected part, 19...
・Confirmation mark (on the main body of the device). Outsourcer: Kawasaki Geotechnical Co., Ltd. Yubilon Fact Co., Ltd. Taku Yokoyama Figure 3 Figure 4 Figure 5 Figure 77 Figure 8 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] 1. A transfer part is provided for transferring a mark onto a sample collected in a sample collection tube, and the orientation of the transfer part is provided on a connecting pipe for pushing the sample collection tube into an excavation hole. A confirmation mark like this is provided, and connecting pipes are successively added to the sample sampling cylinder via an excavation outer cylinder that is fitted onto the sample sampling cylinder and engaged in a fixed position relationship with the sampling cylinder. While confirming the orientation of the transfer part of the sample sampling cylinder using the marks, push the sampling cylinder into the borehole to the sample sampling position. When the sampling position is reached, pressurized water is then applied between the sampling cylinder and the outer cylinder for drilling. At the same time, the pressure water is released from the engagement between the sampling cylinder and the excavation cylinder, and then, while rotating the excavation cylinder, the external cylinder and the sampling cylinder are separated. The required amount of water is extruded into the soil to be sampled, and then the supply of pressure water is stopped and the sampling cylinder is raised above the ground. A sample collection method in geological boring surveys that detects 2. A connecting pipe that is successively added and connected, a device main body connected to the connecting pipe, a sample collecting tube rotatably supported by the device main body, and coaxially located on the outer peripheral side of the sample collecting tube, 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. , 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 releasably engages the device main body and the sample collection tube, and sequentially The connecting pipe to be reconnected and the main body of the device connected to this are as follows:
It has a connecting part and a connected part that are always connected in a fixed position relationship without being displaced in the circumferential direction, and the sample collecting tube is further provided with a transfer part for transferring a mark to the sample to be collected inside the tube. , and the connecting tube is provided with a confirmation mark for identifying the direction of the transfer portion.