JPH0366893A - Core sampling device - Google Patents

Abstract

PURPOSE:To prevent drop of a core providing a protrusion at the outer circumferential surface and inside surface of a cylindrical ring, locating two windows oppositely with respect to the cylinder axis of the ring, and forming a detent part which detains the protrusion on the outer circumferential surface. CONSTITUTION:A cylindrical ring 14 is formed from a protrusion 15 with a spring piece screw fitted. another protrusion 16, and a detent 17. This ring 14 is inserted in the ground in the condition a s coaxial with a core tube 1, and a tube 1 is depressed while rotating, and a core A cut by a pit 2 is sent into the tube 1. When a requisite amount of core is sampled and pulled up, the protrusion 15 is pushed ahead by the core A, while the other protrusion 16 is given a leftwise torque to rotate the cylindrical ring 14, which blocks an inner core tube la to prevent drop of the core A major part. Thus prevent of the core slipping off can be provided.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an instrument for collecting geological materials (hereinafter referred to as cores) from strata when conducting geological surveys.

[Conventional technology and its problems]

This type of core collection device has a bit attached to the tip of the core tube, a boring rod connected to the rear end, and the boring rod is rotated to cut rocks, clay, etc. into a cylindrical shape and collect the core. It is collected by sending it into a tube.

In this sampling operation, when the sampling H tool is pulled up from within the stratum after cutting, the core may be pulled out of the core tube. In particular, if the stratum is clay, it is easy to pull out. For this reason, there is a conventional technique in which a core cutter is provided near the pit of the core tube, as described in Japanese Patent Publication No. 42-3922.

[Problems to be Solved by the Invention] The conventional core cutter is provided with a plurality of claw blades in the circumferential direction of the inner surface of the core tube, and the claw blades are fed inward to cut the core and close the inner surface of the core tube. be.

For this reason, the means for attaching and operating the claw blades are complicated, leading to high costs and frequent failures.

Therefore, an object of the present invention is to prevent the core from being pulled out from the core tube with a simple structure.

[Means to solve the problem]

In order to solve the above-mentioned problems, in the present invention, a cylindrical ring is fitted in the core tube of the well-known core collection device near the pit, the outer circumferential surface of this cylindrical ring is made spherical, and the outer peripheral surface of the cylindrical ring is made spherical. The inner surface of the core tube that serves as the seat is also made spherical, and protrusions are provided on the outer circumferential surface and inner surface of the ring, and both protrusions are located on the opposite side with respect to the cylindrical axis of the ring, and the inner surface of the core tube has the following features: The protrusion on the outer peripheral surface forms a locking portion that rotates from the rear end side to the front end side, and in the locked state, the cylindrical ring is coaxial with the core tube. be.

[Operation] The core collection device configured as described above is first inserted into the geological formation with the cylindrical ring coaxial with the core tube, and when the core tube is rotated and pushed down, the core tube is cut by the binod. The core is fed into the core tube. This fed core hits a protrusion inside the cylindrical ring, but the rotation direction of the cylindrical ring due to this contact is such that the protrusion on the outer circumference faces from the rear end of the core tube to the tip. The protrusion locks into the locking portion of the core tube to prevent rotation. That is, the cylindrical ring remains coaxial with the core tube and the core is fed smoothly into the core tube.

Next, when the required amount of core is collected and the collection device is pulled up, the core inside the core tube moves downward and hits the protrusion inside the cylindrical tube. , the protrusion on the outer circumferential surface is directed from the tip to the rear end of the core tube, the opposite direction as described above, so that the cylindrical ring is moved toward the outer circumferential surface and It rotates based on the spherical surface of the catch and closes the inside of the core tube. Due to this action,
Most of the core is prevented from falling.

[Example] As shown in the figure, this example is a double tube type that can be used for hard stone, soft stone, and clay, and the core tube 1 has an inner core tube 1a and an outer core tube 1b. A joint tube 13 is screwed to the tip of the out-core tube 1b, and a pin 2 for cutting rocks, clay, etc. is attached to the tip of the joint tube 13 by screwing.

A core barrel head 6 is attached to the rear end of the out core tube 1b.
A boring rod 3 is screwed in and connected thereto, and the inner core tube 1a is rotatably supported by a barrel head 6 via a bearing 7. An extension tube 8 is attached to the tip of the inner core tube 1a, and a hard rock (
(Fig. 4), soft stone (Fig. 5), and clay (Fig. 1) are connected.

For clay, as shown in FIGS. 1 and 2, an inner extension tube 10, a stopper tube 9, an inner shoe 11, and a shoe 12 are connected in order by fitting. A housing portion for the core A is formed by the shoe 11, the stopper tube S1, the inner extension tube 10, the extension tube 8, and the inner core tube 1a. The length of this storage section is appropriately selected depending on the application.

The extension tube 5 is the joint tube 1.
3, and its outer diameter is larger than the inner surface of the clay bit 2, and the same or smaller than the inner surface of the outer core tube 1b, and its inner surface is larger than the inner diameter of the inner core tube 1a except for the base. This stepped portion becomes a cylindrical recess 4 that is coaxial with a tube 8 that accommodates a bag 5 for hard stones and soft stones, which will be described later. In addition, if it is only for clay, use extension tube 8 and inner extension tube 10.
There is no need to form the recess 4 with the stopper tube 8 as one product.

A cylindrical ring 14 shown in FIGS. 1 to 3 is fitted into the stopper tube S. As shown in FIGS.

The outer peripheral surface of this ring 14 is a spherical surface, and the inner surface 9a of the stopper tube 9 serving as its seat is also a spherical surface.Since both surfaces are spherical, the ring 14 can rotate within the stopper tube S. A protrusion 15 with a spring piece screwed is provided on the inner surface of the ring 14, and a protrusion 16 is provided on the outer peripheral surface with its edge protruding.
is located on the opposite side to the cylindrical axis of the ring 14. Note that the edge of the ring 14 and the edge of the protrusion 16 have a tapered blade shape.

Therefore, in Fig. 1, the protrusion 15 is
When pressed, the protrusion 16 is applied with a clockwise rotational force and hits the inner surface 9a, thereby preventing further rotation of the cylindrical ring 14. That is, the contact surface becomes the locking portion 17.

On the other hand, when the protrusion 15 is pushed forward, a counterclockwise rotational force is applied to the protrusion 16, and the cylindrical ring 14 rotates to the state shown in FIG. 2 to close the inner core tube 1a.

In addition, for hard stones, as shown in FIG. 4, a lifter tube 20 and a core lifter 21 are connected to the inner extension tube 10 in place of the stopper tube 9, inner shoe 11, and shoe 12. The core lifter 21, which is divided in the circumferential direction, moves back and forth to guide the core A inwardly and prevent it from falling outward. In other words, during cutting, the inner diameter is expanded by retreating as shown in Figure 6, and there is no problem in feeding the core.
When pulling out, as shown in FIG. 4, it moves forward due to its own weight and the weight of the core A, narrowing the inner diameter to prevent it from falling into the core.

For soft stone, as shown in FIG. 5, a core guide shoe 22 is connected to the inner extension tube 10 in place of the stopper tube 9, etc. Ha, Shoe 22
Since it is press-fitted into the inner core tube 1a and wrapped in a bag 5, which will be described later, most of the inside of the inner core tube 1a can be pulled up without falling.

Bags 5 for both hard stones and soft stones are stored in the recess 4,
The bag 5 is made of various materials such as synthetic resin, and may be in the form of a fine mesh or a film. The point is that core fragments such as rocks should not protrude. The inner extension tube 10 prevents the bag 5 from separating from the recess 4. When the ring 5b at the bottom of the bag 5, which extends inward from the inner tube 1a, is pushed backward as the core A advances, as will be described later, the tube The portion 5a is fed into the inner core tube 1a from the bottom side. Therefore, the opening 5c of the bag 5 remains within the recess 4, and is supported within the four parts 4 as if it were removable unless it is pulled out from the gap between the inner extension tube 10 and the inner core tube 1a. state.

Note that when using clay or soft rock, as shown in FIGS. 1 and 2, the inner core tube 1a is urged forward by a spring 30, and this urging force causes the inner core tube 1a to be moved from the focus 2 to
A shoe 12 or 22 protrudes and obtains a core A of the inner diameter of this shoe 12.22.

On the other hand, when cutting hard stones, a cylindrical sleeve 31 (dashed line in FIG. 1) is fitted in place of the spring 30, and the core lifter 21 is fixed in a retracted state from the bit 2 for hard stones during cutting. Also, joint tubes 13a for soft rock and 13b for hard rock are prepared respectively.

This embodiment is constructed as described above. First, in order to collect the core A of the clay layer, the cylindrical ring 14 is placed on the same axis as the core tube 1, as shown in FIG. When the core tube 1 is inserted into the geological formation and pushed down while rotating, the core A cut by the bit 2 is fed into the core tube 1.

Next, collect the required amount of cores and pull them up, and the second
As shown in the figure, the core A causes the cylindrical ring 14 to rotate and close the inside of the core tube 1, preventing most of it from falling into the core.

In the case of hard stone and soft stone, as shown in Figures 4 and 5,
When cutting is performed with the bag 5 housed in the recess 4, as the core A is cut, the core A is fed into the inner extension tube 10 and the bottom ring 5b of the bag 5 is cut, as shown in FIG. The bag 5 is moved inside the inner core tube 1a while being brought into contact with the inner core tube 1a and pulled out from the recess 4. On this occasion,
Since the outer circumferential surface of the core A is covered with the bag 5, no debris etc. protrude from the outer circumferential surface, that is, the core A maintains its cut cylindrical state and is inserted into the inner core tube 1.
Proceed within a. Therefore, there is no friction between the inner core tube 1a due to debris or the like hitting the inner surface of the inner core tube 1a, and the core A moves smoothly due to the sliding properties of the bag 5.

If the required amount of core A is collected, the price will be increased.

Note that, if necessary, the bag 5 can also be used for clay.

Furthermore, it goes without saying that the present invention can also be applied to a single tube type.

[Effects of the Invention] This invention is configured as described above, and the core is prevented from falling by the rotational movement of the cylindrical ring.
The structure is simple and the cost is low.

[Brief explanation of drawings]

Figures 1, 4, and 5 are cross-sectional views of one embodiment of the core collection device according to the present invention, where Figure 1 is for clay, Figure 4 is for hard stone, and Figure 5 is for soft stone. 2 is an explanatory diagram of the operation of FIG. 1, FIG. 3 is a perspective view of the cylindrical ring of FIG. 1, and FIG. 6 is an explanatory diagram of the operation of FIG. 4. 1...Core tube, 1a...Inner core tube, 1b...
・・Out core tube, 2・・・・Bit,
4... Concavity, 5... Bag, 8... Extension tube, 9...
... Stopper tube, 10 ... Inner extension tube,
11...Inner shoe 12...Shoe 13.13a, 13b...Jigoto tube, 14...Cylindrical ring, 15.16...
... Protrusion, 17 ... Locking part, 20 ... Lifter tube, 21 ... Core lifter 22 ... Core guide shoe

Claims (1)

[Claims] (1) In a core collection device in which a bit is attached to the tip of a core tube and a boring rod is connected to the rear end, a cylindrical ring is fitted in the core tube near the bit, and the outer peripheral surface of this cylindrical ring is made spherical. In addition,
The inner surface of the core tube that serves as the seat is also made spherical, and protrusions are provided on the outer circumferential surface and inner surface of the ring, respectively,
Both protrusions are located on the opposite side to the cylindrical axis of the ring,
A locking portion is formed on the inner surface of the core tube, and the protrusion on the outer circumferential surface rotates from the rear end side to the front end side to lock the locking portion, and in the locked state, the cylindrical ring is aligned with the core tube. A core collection instrument characterized by a shaft.