JPH0143119B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is a core tube with a bit for cutting rocks, etc. attached to the tip thereof, and a boring rod connected to the rear end to cut a core for geological investigation of rocks, etc. Concerning the instrument for collecting.

[Prior Art and its Problems] This type of core collecting device rotates a boring rod, cuts a rock or the like into a cylindrical shape with a bit, and sends 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. These fragments become embedded in the inner surface of the core tube, obstructing the feeding of the core itself, and clogging the core.

When this core clogging occurs, the cutting operation is stopped and
The core extraction equipment must be raised above the ground, cleaned, and then reinserted into the borehole. Therefore, in the above-mentioned ground with many fractured layers and cracks, each excavation step is as short as 20 to 30 cm, resulting in poor workability. In particular, when the depth of excavation increases, labor and time are expended in raising and lowering the rod (collecting instrument), and the time required to raise and lower the collecting instrument becomes longer than the excavation time, resulting in very poor work efficiency. Furthermore, core clogging can cause slime.

For this reason, conventionally, as shown in Japanese Patent Publication No. 42-3922, the bag is stored in the core tube,
There is a technique to excavate the core while wrapping it in this bag.

However, the bag delivery port of this technology connects the end of the bag storage tube to the inner surface of the tube that covers the outer surface of the tube.
Since the bag is only held in position, there is a problem that when the bag is fed out, the bag barrel shakes and the bag is not fed out smoothly.

Therefore, an object of the present invention is to facilitate the delivery of bags.

[Means to solve the problem]

In order to achieve the above object, this invention:
In a core collecting device that collects the core of rocks, etc. by attaching a bit for cutting rocks, etc. to the tip of the core tube and connecting a boring rod to the rear end, a cylindrical recess coaxial with the core tube is provided on the inner surface of the tip of the core tube. A cylindrical bag with a bottom is stored in this recess so that its cylindrical axis becomes the central axis of the core tube and the bottom protrudes inward from the rear end of the recess, and the opening of the recess is positioned at the rear end. The tube is closed by a cylindrical tube that is coaxial with the core tube and has an inner diameter approximately the same as the bit inner diameter, and is removable from the core tube, and is located in a recess on the rear outer surface of the cylindrical tube. The ring is fitted with the cylindrical portion of the bag interposed therebetween, and the bag is set such that its diameter when stored in the recess is approximately the same as or slightly larger than the outer diameter of the cylindrical tube facing the recess, and the opening thereof is The structure is such that it is removably supported within the recess.

[Effect]

With the core collection device configured as described above, when cutting is performed with the bag housed in the recess, as the core is cut, the core is fed into the core tube and comes into contact with the bottom of the bag, pushing the bag to the rear end of the opening of the recess. Proceed by drawing from. During this withdrawal, due to the presence of the ring, the bag is smoothly fed out without shaking and covers the core.

〔Example〕

As shown in FIGS. 1 to 3, in this embodiment, a bit 2 for cutting rocks, etc. is attached to the tip of a core tube 1, and a boring rod 3 is connected to the rear end to cut a core A of rocks, etc. In the core collection device for collecting cores, a cylindrical recess 4 coaxial with the core tube 1 is formed on the inner surface of the tip of the core tube 1, and a cylindrical bag 5 with a bottom is placed in the recess 4, the axis of which becomes the central axis of the core tube 1. together with the bottom 5b
is housed so as to protrude inward from the rear end of the recess 1, and the opening of the recess 4 is closed by a cylindrical tube 10 that is coaxial with the core tube except for the rear end and has an inner diameter approximately the same as the inner diameter of the bit 2. A cylindrical tube 10 is detachably attached to a core tube 1.

The core tube 1 is an inner tube 1a.
A bit 2 is screwed into the tip of the out tube 1b, and a boring rod 3 is screwed into the rear end through the core barrel head 6, and the inner tube 1a is connected to the barrel head 6. is rotatably supported via a bearing 7.

An extension tube 8 is attached to the tip of the inner tube 1a, and a lifter tube 9 is provided at the tip of the tube 8 via the storage tube of the bag 5 made of the cylindrical tube 10. , the storage tube 10, the extension tube 8, and the inner tube 1a form a storage section for the core A. The length of this storage portion may be appropriately selected depending on the application.

The inner diameter of the extension tube 8 is larger than the inner diameter of the inner tube 1a except for the base part, and this recessed part becomes the above-mentioned recessed part 4, and its opening is closed by the storage tube 10 except for the rear end. .

The bag 5 is stored in the recess 4. When the bag 5 is stored in the recess 4, its diameter is set to be approximately the same or slightly larger than the outer diameter facing the recess 4 of the storage tube 10, and the bag 5 is made of synthetic resin or the like. It can be made from a variety of materials, and may be in the form of a fine mesh or a film. In short,
It is fine if no fragments stick out.

Preventing the bag 5 from leaving the recess 4 is done by the storage tube 10, and a ring 11 is fitted onto the rear outer surface of the tube 10 with the cylindrical portion 5a of the bag 5 interposed therebetween. When the bottom 5b projecting toward the side is pushed backward as the core A advances as described later, the cylindrical portion 5a is guided by the ring 11 and is smoothly sent out from the bottom 5b side into the inner tube 1a without swinging. Therefore, the opening 5c of the bag 5 remains within the recess 4, that is, as long as it is not pulled out from the ring 11, the opening 5c of the bag 5 remains removably supported within the recess 4.

Core lifter 1 is installed on the inner surface of lifter tube 9.
2 is provided, and the cylindrical core A cut by the bit 2 is guided by the core lifter 12 and guided into the inner tube 1a. Further, the core lifter 12 serves to prevent the core A from falling.

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, and any method may be used to store the bag 5 in the recess 4. It may be folded as shown in the figure, or it may be bent into a bellows shape as shown in Fig. 3. The point is that it should be sent out smoothly.

The embodiment is configured as described above, and its operation will be explained next.

When collecting cores of rocks, etc., as shown in Fig. 1, when cutting is performed with the bag 5 housed in the recess 4, as the core A is cut, the core A is removed as shown in Fig. 2. , is fed into the extension tube 8, comes into contact with the bottom 5b of the bag 5, and advances through the inner tube 1a while pulling out the bag 5 from the rear end of the opening of the recess 4. At this time, 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 advances inside the core tube 1 while maintaining its cut cylindrical state. do. Therefore, there is no friction between the core tube 1 due to fragments sticking into the inner surface of the core tube 1, 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 tube 1a, this tool is pulled up from the ground through the drilling hole, and the bit 2, lifter tube 9, and storage case are removed. 10. Remove the extension tube 8 etc. from the core tube 1 and take out the core A together with the bag 5. 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. , and the above-mentioned sampling operation is carried out by sending it into the trench hole. The above action is repeated to advance the trench.

〔Effect of the invention〕

Since the present invention is constructed as described above, the bag is smoothly fed out from the storage portion (recess), the outer circumferential surface of the core is covered by the bag, the friction between the core and the inner surface of the core tube is minimized, and the core is It is smoothly fed into the core tube. Therefore, the depth of digging at one time can be increased, and the length of the core tube (the length of the core at one time) can also be increased, which greatly improves work efficiency. Also, since there is no core clogging, slime is less likely to form.

Furthermore, the bag is stored in the inner recess of the core tube,
Since the bag was sent out from the rear end of the recess,
The structure is simple, and the core diameter (inner diameter of the core tube) can be made sufficiently large compared to the instrument diameter.

In addition, since the cylindrical tube that closes the opening of the recess is removable from the core tube, when storing the bag after core collection, the bag can be stored in the recess with the front of the opening of the recess open. 1st
Since the bag can be stored in the recess in a folded or bellows-like shape as shown in FIGS. 3 and 3, the bag can be stored very easily.

[Brief explanation of drawings]

1 and 2 show one embodiment of the core collection device of the present invention, FIG. 1 is a sectional view of the main part before cutting work, FIG. 2 is a sectional view of the main part during cutting work, and FIG. 3 is a cross-sectional view of another embodiment. It is a sectional view of the main part of an example. 1... Core tube, 2... Bit, 3... Boring rod, 4... Recess, 5... Bag, 5a...
...tube, 5b...bottom, 5c...opening, A...
core.

Claims (1)

[Claims] 1. In a core collecting device that collects a core A of rocks, etc. by attaching a bit 2 for cutting rocks, etc. to the tip of the core tube 1 and connecting a boring rod 3 to the rear end, the core tube 1 is attached to the inner surface of the tip of the core tube 1. A cylindrical recess 4 having the same axis as the recess 4 is formed, and a cylindrical bag 5 with a bottom is inserted into the recess 4 so that its cylinder axis becomes the central axis of the core tube 1 and the bottom 5b extends from the rear end of the recess 4 inward to the core tube 1. The opening of the recess 4 is closed except for the rear end by a cylindrical tube 10 that is coaxial with the core tube 1 and has an inner diameter that is approximately the same as the inner diameter of the bit 2. A ring 11, which is removable and is located in the recess 4, is fitted to the rear outer surface of the cylindrical tube 10 with the cylindrical part 5a of the bag 5 interposed therebetween, so that when the bag 5 is stored in the recess 4, A core collection instrument characterized in that its diameter is set to be approximately the same as or slightly larger than the outer diameter of the cylindrical tube 10 facing the recess 4, and the opening 5c is detachably supported within the recess 4. .