JP3676292B2 - Core sampling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention collects the ground at the survey site in a survey for identifying the location where the ground breaks, such as a landslide survey and a fault survey, and the core sampling device is intended to collect high-quality cores at that time Specifically, the present invention relates to a core collecting device having a double tube structure having an inner tube inside an outer tube.
[0002]
[Prior art]
The core collecting device with a double pipe structure is usually an inner pipe in which a plurality of tubes are connected, and the inner pipe is connected to the boring rod so that rotation cannot be transmitted, and is connected to the uppermost tube of the inner pipe. The core is taken in.
[0003]
However, since the uppermost tube has a cylindrical shape, in order to investigate the core clogged therein, the core is pushed out, and there is a problem that the core is disturbed. In addition, in the core collection device, a pair of halves are held inside the inner tube to hold the cylindrical collection tube, and the core clogged in the collection tube can be removed and investigated However, the diameter of the core that can be collected is reduced by the thickness of the sampling tube, and the drilling speed is slowed by increasing the drilling area, damaging the ground that is the drilling surface, and disturbing the core to be sampled There is a problem.
[0004]
Therefore, the present inventor, like the sampling tube, forms the uppermost tube of the inner tube by abutting a pair of halves, takes the core directly into the inner tube, removes the half and investigates I came up with. However, since the uppermost tube was conventionally cylindrical, it could be screwed and connected to the boring rod side, but if it is a pair of halves, it cannot be fixed in the same manner. Moreover, if the cylindrical shape is not maintained while the core is being taken in, the taken-in core will be disturbed, so it is necessary to integrate a pair of halves.
[0005]
[Problems to be solved by the invention]
The present invention has been developed in consideration of the above circumstances, and its purpose is to integrate the uppermost tube of the inner tube so that the cylindrical shape can be held while the core is being taken in while the half tube is divided. It is to be.
[0006]
[Means for Solving the Problems]
In the present invention, an outer tube is suspended from a rotating boring rod via an outer tube head, and the inner tube head is connected to a spindle that is suspended from the outer tube head so that rotation cannot be transmitted, and a plurality of tubes are connected. In a core sampling device that has an inner pipe hanging from the inner pipe head and a fluid passage between the outer pipe and the inner pipe, the uppermost tube of the inner pipe can be attached to and detached from the inner pipe head via an attachment. The uppermost tube of the inner tube is a pair of halves that are cylindrically joined to each other, and the attachment is fitted to the upper part of both halves that are abutted and fixed with a locking tool. It is characterized by holding a cylindrical shape.
[0007]
A locking tool means what can fix a half body to an attachment, and a screw is mentioned as an example. Examples of the fluid include water, viscous liquid, and bubbles.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 and 2, the core collecting apparatus of the present invention hangs an outer tube 3 from a boring rod 1 via an outer tube head 2, and hangs a support shaft 4 from the outer tube head 2. The inner pipe head 6 is attached to the front end of the inner pipe 8 via the bearing 5, the inner pipe 8 is suspended from the inner pipe head 6 via the attachment 7, and a fluid passage 9 is provided between the outer pipe 3 and the inner pipe 8, A bit 10 is attached to the end of the outer tube 3.
[0009]
The outer tube 3 is formed by screwing a plurality of tubes and connecting them in the vertical direction. The uppermost tube is screwed into the outer tube head 2 and the bit 10 is screwed into the lowermost tube.
[0010]
The inner pipe head 6 is formed by screwing and integrating a plurality of blocks. A cylindrical upper block 11 is covered on the bearing 5 by using an inner rod, and a lower block 12 is placed on the upper block 11. A downward hole 13 for fitting the attachment 7 is opened at the center of the bottom surface of the lower block 12 by screwing.
[0011]
The attachment 7 has an upward convex portion 14 that fits in the downward hole 13 at the upper portion thereof, an intermediate flange portion 15 that has an annular flange 15, and a lower convex portion 16 that fits in the inner tube 8 under the flange 15. An O-ring 17 is fitted on the outer periphery of the upward convex portion 14, and a plurality of retaining holes 19 for locking tools 18 (screws) are formed on the outer periphery of the downward convex portion 16. Since the attachment 7 is attached to the inner tube head 6 by the elasticity of the O-ring, the attachment / detachment operation between the attachment 7 and the inner tube head 6 is simply an insertion and extraction operation, and can be performed quickly.
[0012]
The inner tube 8 is formed by fitting a plurality of tubes and connecting them vertically. The uppermost tube 20 is an inner tube for taking in the core, and the inner tube 20 includes a support tube 21, an inner extension 22, and a core lifter case. 23 are sequentially inserted and removably inserted.
[0013]
As shown in FIG. 3, the inner tube 20 has a cylindrical shape formed by butting a pair of half-circular halves 24 having a semicircular cross section, and a plurality of screw holes 25 are formed in the upper portion thereof.
[0014]
As shown in FIG. 2, the support tube 21 surrounds the lower portion of the inner tube 20 at the upper portion from the outside, and has an annular protrusion 26 that supports the lower end of the inner tube 20 at the intermediate portion.
[0015]
The inner extension 22 has an upper portion that deeply enters the lower inner side of the support tube 21, and a pocket 27 into which a bag is inserted is formed between the support tube 21 and the inner extension 22.
[0016]
The core lifter case 23 has a tapered shape in which the lower inner periphery is narrower than the upper inner periphery, and a core lifter 28 having a C-shaped cross section is fitted inside the core lifter case 23 so as to be movable up and down. At the time of excavation, the core C enters from the bit 10 and pushes up the core lifter case 23 together with the core lifter 28, and the diameter of the core lifter 28 increases and the core C is taken in the inner tube 20 in a state of being wrapped in a bag. Further, when the boring rod 1 is lifted after excavation, the core lifter case 23 is supported by the inwardly stepped portion 29 of the bit 10, and the core lifter 28 lowered in the core lifter case 23 narrows the diameter and holds the core C, Prevent core C from falling.
[0017]
The present invention is not limited to the above embodiment. For example, the connection between the attachment 7 and the inner tube head 6 uses not only the downward hole 13 but also the male screw for screw joining, using the elasticity of the O-ring 17 fitted to the upward convex portion 14. Other methods such as using a female screw may be used.
[0018]
【The invention's effect】
In the present invention, since the attachment is fitted to the upper part of the pair of halves and fixed with the locking tool, the cylindrical shape is securely held, and as a result, the core is taken in without being disturbed in the cylinder. It is. Therefore, if the half is opened after removing the locking tool, the core that has been taken in can be investigated without breaking it, and the accuracy of the investigation is improved. In addition, after opening a half body, it can transfer to the half body for storage prepared separately, and can also preserve | save without destroying a core.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an upper part of a core collecting apparatus of the present invention.
FIG. 2 is a longitudinal sectional view showing a lower part of the core collecting device.
FIG. 3 is a longitudinal sectional view showing a connection relationship between the uppermost tube and an attachment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Boring rod 2 Outer tube head 3 Outer tube 4 Support shaft 6 Inner tube head 7 Attachment 8 Inner tube 9 Fluid passage 18 Locking tool 20 Uppermost tube (inner tube)
24 halves

Claims (1)

The outer tube (3) is suspended from the rotating boring rod (1) via the outer tube head (2), and the inner tube head (6) is moved against the support shaft (4) suspended from the outer tube head (2). The inner pipe (8), which is coupled so as to be unable to transmit rotation and is connected to a plurality of tubes, hangs down from the inner pipe head (6), and a fluid passageway (9) between the outer pipe (3) and the inner pipe (8). In a core collection device with
The uppermost tube (20) of the inner tube is detachably connected to the inner tube head (6) via the attachment (7), and the uppermost tube (20) of the inner tube abuts into a cylindrical shape. A pair of halves (24), and retaining the cylindrical shape by fitting the attachment (7) into the upper part of the halves (24) butted together and fixing with the locking tool (18) A core collecting device characterized by.

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