JPH0227032Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a double tube type core collection device.

This type of core collecting device rotates a boring rod to cut a rock or the like into a cylindrical shape using a bit, and then feeds the core into a core tube to collect the core.

By the way, when sampling work is carried out on ground with many fractured layers and cracks, the cores to be sampled do not form a solid cylindrical shape, but instead collapse or fragments protrude from the outer surface of the core. This debris gets embedded inside the core tube and obstructs the feeding of the core itself. When this debris gets embedded and core clogging occurs, the cutting operation is stopped, the core collection device is raised above the ground, cleaned, and the bore hole is re-bored. You have to insert it into . Therefore, in the above-mentioned fractured layer and ground with many cracks, the length of one excavation is 20 to 30 mm.
It is short (cm) and has poor workability. Particularly, as the depth of excavation increases, labor and time are required to raise and lower the rod (collecting tool), and the time required to raise and lower the collecting tool is longer than the digging time, resulting in very poor workability. Furthermore, core clogging can cause slime.

Therefore, as shown in Japanese Patent Application Laid-Open No. 57-201491, the applicant proposed that the core tube is a double tube type consisting of an inner tube and an outer tube, and a bit for cutting rocks etc. is attached to the tip of the outer tube. A boring rod is connected to the rear end, and an extension tube is connected to the tip of the inner core tube, and a recess is formed on the entire inner circumference of the extension tube. The bag is stored so that its cylindrical axis becomes the central axis of the core tube, and as the core is cut, the core advances inside the extension tube and inner core tube while pulling the bag out of the recess, and the core is inserted into the bag. We proposed a core collection device that has a longer cutting depth by covering it with a core.

However, in this collection device, the extension tube is covered with a bit and the bit is directly connected to the outcore tube.
Bits, which are consumable items, are becoming longer and more expensive, and there is also a problem with the size of the bag storage section. This bit length problem can be solved by interposing a joint tube between the outcore tube and the bit, and the problem with the bag storage section can be solved by making the joint tube correspond to the extension tube, and by installing a joint tube between the out core tube and the bit. If the inner surface of the tube is located outside the inner surface of the bit and out core tubes, the extension tube can bulge outward and this problem can be solved.

The purpose of this invention is to provide a core collection device that solves the above problems, with the above points in mind.

That is, in the double-tube type core collection device employing the above-mentioned joint tube, a screw is formed on the inner surface of the joint tube using the bit of the joint tube and the connection with the outer core tube as screw means, and the outer surface of the extension tube is It is located outside the inner surface of the bit and outcore tube.

In this way, if the threaded part of the joint tube is on the inner surface, the threaded part on the bit and outcore tube sides will be on the outer surface, making it possible to position the inner surface of the joint tube outside of the inner surfaces of the bit and outcore tube. The inner surface of the joint tube is retracted outward to protrude the extension tube into the space created, and its outer surface is located outside the inner surfaces of the bit and outcore tube.

An embodiment of this invention will be described below with reference to the accompanying drawings.

As shown in the figure, the core tube 1 consists of an inner core tube 1a and an outer core tube 1b, and a joint tube 13 is screwed to the tip of the outer core tube 1b. A bit 2 for cutting rocks, etc. is attached to the outer core tube 1b, and a boring rod 3 is connected to the rear end of the outer core tube 1b by screwing through the core barrel head 6.The inner core tube 1a is connected to the core barrel head 6 by a bearing 7. It is rotatably supported via.

The threaded portions 13' at both ends of the joint tube 13 are formed on the inner surface, so that the bit 2 and the threaded portions 2', 1 of the outcore tube 1b are connected to each other.
b' is formed on the outer surface, and the inner surface of the joint tube 13 is located outward from the inner surfaces of the bit 2 and the out-core tube 1b by the thickness of the threaded portions 2' and 1b'.

An extension tube 8 is attached to the tip of the inner core tube 1a, and a lifter tube 9 is provided at the tip of the tube 8 via a storage tube 10. 8 and inner core tube 1a to core A
A storage section is formed. The length of this storage portion may be appropriately selected depending on the application.

The extension tube 8 is located corresponding to the joint tube 13 and protrudes outward from the inner surfaces of the bit 2 and 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. The recessed part becomes a cylindrical recess 4 coaxial with the tube 8 that stores the bag 5. This recess 4 has a larger inner diameter than the conventional extension tube 8, so the bag 5 cannot be stored in the recess 4. It is easier to store.

The storage tube 10 is formed to have the same inner diameter as the inner diameter of the bit 2, is detachably attached to the inner core tube 1a via the extension tube 8, and is coaxial with the core tube 1.
From the middle to the rear, the opening of the recess 4 is closed except for the rear end.

When the bag 5 is stored in the recess 4, its diameter is set to be approximately the same as or slightly larger than the outer diameter of the rear portion of the storage tube 10 facing the recess 4, and is made of various materials such as synthetic resin and has a fine mesh shape. It may be in the form of a solid or film. The point is that no core fragments should protrude.
The storage tube 10 prevents the bag 5 from leaving the recess 4.
Inner core tube 1 of bag 5
When the bottom portion 5b projecting inward a is pushed rearward as the core A advances as described later, the cylindrical portion 5a is fed into the inner core tube 1a from the bottom portion 5b side. Therefore, the opening 5c of the bag 5 remains in the recess 4, and in other words, as long as the bag 5 is not pulled out from the gap between the storage tube 10 and the inner core tube 1a, it appears to be detachably supported within the recess 4. Become.

A core lifter 12 divided in the circumferential direction is provided on the inner surface of the lifter tube 9 so as to be movable back and forth, and the cylindrical core A cut by the bit 2 is guided by the core lifter 12 and moved to the inner core tube. It is guided into the interior of 1a and is prevented from falling out when being pulled out. That is, during cutting, as shown in Figure 2, the inner diameter is expanded by moving backwards to guide the feeding of the core A without any hindrance, and when withdrawing, as shown in Figure 1, the inner diameter is moved forward by its own weight and the weight of the core A. Narrow it to prevent core A from falling.

Note that the length (depth) of the bag 5 is appropriately set depending on the internal length of the core tube 1 and the length of the collected core A, and any method may be used to store the bag 5 in the recess 4. It may be folded as shown in Figure 1, or bent into a bellows shape as shown in Figure 3. The point is that it should be sent out smoothly. Furthermore, the bottom of the bag 5 may cover the entire bottom as shown in FIG. 4a, or may have a hole 15 in the center as shown in FIG. 4b. Further, the bottom of the bag 5 may be a cylindrical ring 11 as shown in FIG. It is detachably attached to the groove of the ring 11. This fourth
Cutting water in the core A is drained from the hole 15 in the case of the bag bottom shown in FIG. b, and from inside the ring 11 in the case of the bag bottom shown in FIG.

In addition, the space between the inner core tube 1a and the outer core tube 1b becomes a passage for water, but if an appropriate number of holes 14 are formed on the outer periphery of the rear part of the extension tube 13 as shown in the figure, 1
Water is ejected from 4 into the extension tube 8 to push the core fragments to the outside and facilitate the withdrawal of the bag 5.

The core collection device of the embodiment is constructed as described above, and when collecting cores of rocks, etc., as shown in FIG. As the core A is cut, as shown in FIG. 2, the core A is fed into the storage tube 10 using the core lifter 12 as a guide. Inner and inner core tube 1
Proceed within a. At this time, the outer peripheral surface of core A is
Since the inner core tube 1a is coated with
proceed within. Therefore, there is no friction between them due to fragments sticking into the inner surface of the inner core tube 1a, and the core A moves smoothly due to the sliding properties of the bag 5.

When the allowable cutting depth of this tool is reached, that is, when the core A reaches the deep part of the inner core tube 1a, the tool is pulled up from the borehole to the ground, and the bit 2, joint tube 13, and lifter are removed. Tube 9, storage tube 1
0. Remove the extension tube 8 etc. from the core tube 1, and remove the core A together with the bag 5.
Take out. After taking it out, the bag 5 is stored in the recess 4 again, and the bag 5 may be reused or new.The tubes 8, 10, 9 and the bits 2 are attached to the core tube 1, and the bag 5 is placed in the recess 4 again. , into the borehole to perform the above-mentioned collection action.
The above action is repeated to dig.

As described above, according to the core collection device of this invention, the threaded portion that screws together with the bit of the joint tube and the out core tube is formed on the inner surface, and the outer surface of the extension tube forming the bag storage part is formed with the bit. Since the outer core tube is located outside the inner surface of the outer core tube, the bag storage area determined by the distance (depth) from the inner surface of the inner core tube to the outside can be made large, and the length of the bag can be increased. It has the effect that it can be stored very sufficiently and reliably, and that it can be delivered smoothly.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the core collection device according to this invention.
The figures are sectional views of the main parts during the cutting operation, FIG. 3 is a sectional view of the main parts of another embodiment, and FIGS. 4a and 4b are explanatory views of each example of the bag bottom. 1... Core tube, 1a... Inner core tube, 1b... Out core tube, 1b'...
Threaded part, 2... Bit, 2'... Threaded part, 3
...boring rod, 4 ... recess, 5 ... bag,
5b...bottom of bag, 8...extension tube, 10...storage tube, 13...joint tube, 13'...screw part.

Claims (1)

[Scope of utility model registration request] The core tube 1 is of a double tube type consisting of an inner core tube 1a and an out core tube 1b, and a joint tube 13 is connected to the tip of the out core tube 1b by screw connection,
A bit 2 for cutting rocks, etc. is attached to the tip of the joint tube 13 by screw connection, and a boring rod 3 is connected to the rear end.
An extension tube 8 located corresponding to the joint tube 13 is connected to the tip of the inner core tube 1a, and the tube 8 is connected to the entire inner circumference of the extension tube 8.
A cylindrical recess 4 coaxial with the recess 4 is formed.
A bottomed cylindrical bag 5 is connected to the core tube 1 with its axis.
The opening of the recess 4 is coaxial with the core tube 1 except for the rear end, and the inner diameter of the bit 2 is the same as the inner diameter of the bit 2. It is closed by a cylindrical storage tube 10 having approximately the same inner diameter, and this storage tube 10 is removably attached to the inner core tube 1a via the extension tube 8, and as the core is cut, the core A is inserted into the storage tube 10. In a double-tube type core collection instrument that moves inside the inner core tube 1a while pulling out the bag 5 from the recess 4, the threaded portion 13' screwed to the bit 2 of the joint tube 13 and the outer core tube 1b is attached to the inner surface. A core collection device characterized in that the outer surface of the extension tube 8 is located outside the inner surfaces of the bit 2 and the out core tube 1b.