JP2022013314A - Core sampling device - Google Patents

Abstract

To provide a wire line type core sampling device that can be shared for soft rock and hard rock, and can simplify its structure and reduce its length.SOLUTION: A wire line type core sampling device comprises an outer tube 12, an inner tube 15 that is inserted to the inside of the outer tube 12 and has a core taking-in part 17 at its tip, and a swivel mechanism 13 that rotatably supports the inner tube 15 relative to the outer tube 12. A support shaft 21 of the swivel mechanism 13 has a first shaft body 24, a second shaft body 25, and a spring member 27. The spring member 27 acts as a compression spring when the inner tube 15 retracts relative to the outer tube 12 in a retraction direction, and acts as a tension spring when the inner tube 15 advances relative to the outer tube 12 in a protrusion direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a core sampling device, and more particularly to a wire line type core sampling device.

Conventionally, an outer pipe having a bit at the tip and an inner pipe provided inside the outer pipe to regulate the rotation are provided, and a fluid passage for passing an excavated fluid between the outer pipe and the inner pipe is provided. There is known a double tube type core sampling device provided with (see, for example, Patent Document 1). Further, there is known a wire line type core sampling device in which an inner tube can be lifted and collected by a wire from an outer tube (see, for example, Patent Document 2). In the core sampling device for soft rock layers such as gravel and clay as the excavated layer, a shoe is provided at the tip of the inner pipe as a means for taking in the core, and this shoe protrudes from the tip of the bit and the excavated layer. The protrusion dimension is changed by the compression spring according to the hardness of the clay. In addition, the core sampling device for hard rock as an excavated layer is provided with a core lifter case and a core lifter as a core taking-in means at the tip of the inner pipe, and a rod-shaped core cut out by a bit can be taken in. There is.

Further, in the wire line type core sampling device, the inner pipe and the core lifter case, which is the means for taking in the core, are joined by a thin screw so that only the inner pipe portion can be lifted and collected from the outer pipe by a wire. .. Before collecting the inner tube from which the core was collected, the rod-shaped core is cut by raising the entire device slightly. At this time, the core lifter holding the rod-shaped core is subjected to a downward pulling force. Sufficient strength may not be secured by thin-walled screw joining with respect to the cutting force. As a structure for absorbing such a cutting force, the inner tube and the core lifter case can be moved downward (protruding direction) with respect to the outer tube, and are supported by a predetermined stepped portion provided on the inner surface of the bit. In addition, a structure is adopted in which a tension spring function for urging the inner pipe and the core lifter case upward is provided.

Japanese Unexamined Patent Publication No. 2007-231630 Japanese Unexamined Patent Publication No. 2012-117310

However, in the conventional wire line type core sampling device, a compression spring for adjusting the protrusion dimension of the shoe for the soft rock layer and a pull for urging the inner pipe and the core lifter case at the time of core cutting for the hard rock. It is necessary to provide two types of springs, a spring, and there is a problem that the structure becomes complicated and lengthened.

It is an object of the present invention to provide a wire line type core sampling device that can be shared for soft rock and hard rock, and can simplify the structure and shorten the length.

The core sampling device of the present invention has an outer tube that is rotationally driven by a driving means and has a bit at the tip, an inner tube that is inserted inside the outer tube and has a core intake portion at the tip, and the outer tube. On the other hand, the swivel mechanism is provided with a swivel mechanism that rotatably supports the inner pipe, and the inner pipe and the swivel mechanism are a wire line type core sampling device that can be lifted and collected by a wire. It has a support shaft inserted inside the outer pipe, an inner pipe fixing portion for fixing the base end of the inner pipe, and a rotary connection portion for rotatably connecting the support shaft and the inner pipe fixing portion. However, the support shaft includes a first shaft body that is supported so as not to be able to move forward and backward in the axial direction with respect to the outer pipe, a second shaft body that is provided so as to be able to move forward and backward in the axial direction together with the inner pipe, and the first shaft. It has a body and a spring member provided over the second shaft body, and the spring member functions as a compression spring when the inner pipe retracts with respect to the outer pipe in the immersion direction. It is characterized in that it functions as a tension spring when the inner pipe advances in the projecting direction with respect to the outer pipe.

According to the above invention, the spring member functions as a compression spring when the inner pipe retracts in the immersion direction with respect to the outer pipe, and when the inner pipe advances in the protruding direction with respect to the outer pipe. A compression spring for adjusting the protrusion dimension of the shoe for the soft rock layer by functioning as a tension spring, and a tension spring for urging the inner pipe and the core lifter case when the core is cut for the hard rock. One function can be realized by one spring member. Therefore, it can be shared for soft rocks and hard rocks, and since it is not necessary to provide two types of springs, a compression spring and a tension spring, the structure can be simplified and shortened.

At this time, the spring member is a coil spring having a coil-shaped wire, and the wire pitch is formed at both ends thereof to be smaller than that of the intermediate portion, and the first shaft body and the second shaft body are formed. Each of the first shaft body and the second shaft body is provided with a spiral holding portion for holding the held portion of the spring member, and the spring member is provided with a spiral holding portion. It is preferable that the held portion is held by the holding portion in a state of being expanded in a state larger than the wire pitch in the natural state.

According to this configuration, the first shaft body and the second shaft body are each provided with a spiral holding portion for holding the held portion of the spring member, and the held portion of the spring member is a wire in a natural state. By being held by the holding portion in a state of being expanded beyond the pitch, both ends of the spring member can be reliably held.

Further, it is preferable that the support shaft is provided with a regulating portion for restricting the retreat of the inner pipe in the immersion direction.

According to this configuration, by restricting the retreat of the inner pipe in the immersion direction by the regulation department, it is possible to regulate the retreat of the inner pipe when targeting the hard rock layer, and if the regulation is lifted, the soft rock layer can be regulated. The protrusion dimension of the shoe can be adjusted for the target, and the switching work for hard rock and soft rock can be performed quickly.

At this time, the support shaft has a pair of facing surfaces that approach each other when the inner pipe retracts in the immersion direction, and the restricting portion is inserted between the pair of facing surfaces and installed. Is preferable.

According to this configuration, by inserting and installing the collar, which is a regulating portion, between the pair of facing surfaces of the support shaft, it is possible to regulate the retreat of the inner pipe and remove the collar from between the pair of facing surfaces. By doing so, the regulation can be lifted. Conventionally, when a core sampling device for soft rock, which corresponds to the protrusion allowance of the shoe from the tip of the bit by the adjustment mechanism by the compression spring, is used for hard rock excavation, the compression spring is applied from the support shaft in order to regulate the retreat of the inner pipe. By removing the and attaching the collar, a configuration was adopted that regulates the expansion and contraction of the support shaft. However, in the present invention, since the spring member has the functions of both a tension spring and a compression spring, both ends of the spring member are fixed to the first shaft body and the second shaft body, and the support shaft is used. The structure is such that it is difficult to remove the spring member. Therefore, in the present invention, by providing a pair of facing surfaces on the support shaft at a position different from that of the spring member and inserting a collar between them, the collar can be installed without removing the spring member. The collar can be easily removed, and the switching work for hard rock and soft rock can be performed more quickly.

Further, when the bit is a bit for soft rock and the core intake portion is a shoe, the spring member functions as a compression spring, the bit is a bit for hard rock, and the core capture portion is. In the case of the core lifter case and the core lifter, it is preferable that the spring member functions as a tension spring.

According to this configuration, the bit can be replaced with a soft rock bit or a hard rock bit, and the core intake portion can be replaced with a shoe or core lifter case and a core lifter, thereby facilitating the use condition for soft rock or hard rock. Can be switched to.

According to the wire line type core sampling device of the present invention as described above, it can be shared for soft rock and hard rock, and the structure can be simplified and shortened.

It is sectional drawing which shows the core sampling apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the swivel mechanism of the said core sampling apparatus. It is sectional drawing which shows a part of the swivel mechanism. It is sectional drawing which shows the modification of the swivel mechanism.

The core sampling apparatus according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the core sampling device 10 of the present embodiment has a head portion 11 that is rotationally driven by a rotary drive shaft that is a drive means of a boring machine or the like, and an outer pipe that is fixed to the lower side of the head portion 11. 12, the swivel mechanism 13 inserted inside the head portion 11 and the outer tube 12, the lock mechanism 14 fixed to the upper part of the swivel mechanism 13, and the swivel mechanism 13 connected to the lower side and inserted into the outer tube 12. An inner pipe 15 to be formed, a bit 16 fixed to the tip of the outer pipe 12, and a core intake portion 17 attached to the tip of the inner pipe 15 are provided, and a fluid passage is provided between the outer pipe 12 and the inner pipe 15. Is formed.

In FIG. 1, a bit 16a for excavating soft rock and a shoe 17a which is a core taking-in portion 17 for soft rock are shown on the left side of the tip portion of the core sampling device 10, and the right side of the tip portion of the core sampling device 10 is shown. A bit 16b for excavating hard rock and a core lifter case 17b and a core lifter 17c, which are core intake portions 17 for hard rock, are shown. In the core sampling device 10 for soft rock, the shoe 17a is fixed to the tip of the inner tube 15 via an inner extension. The shoe 17a is a cylindrical part having a sharp tip surface, is attached so as to project about 20 mm from the blade surface of the bit 16a, and expands and contracts according to the hardness of the excavated stratum. The expansion and contraction distance is shown by the dimension A in the figure. In the core collecting device 10 for hard rock, the core lifter case 17b is fixed via the inner extension at the tip of the inner pipe 15, and the core lifter 17c is provided in the core lifter case 17b. The core lifter case 17b is adapted to move in the protruding direction by about several mm to 5 mm inside the bit 16b, and the moving distance is shown by the dimension B in the drawing.

The head portion 11 has an upper head 11a to which a rotation drive shaft (not shown) is fixed by screwing, and a lower head 11b fixed to the lower side of the upper head 11a, and the outer pipe 12 is attached to the lower head 11b. The base end of is fixed by screwing. A lock mechanism 14 is inserted inside the head portion 11. The lock mechanism 14 includes a connecting pipe 14a connected to the swivel mechanism 13, a latch 14b provided on the upper portion of the connecting pipe 14a, a latch retracting case 14e for accommodating the latch 14b, and an upper end of the latch retracting case 14e. A locking claw 14c, which is incorporated in the above, is provided. A stepped surface 14f (see the enlarged view of part A in FIG. 1) is provided on the upper portion of the connecting pipe 14a, and is fixed in the downward direction due to fitting by engaging with the stepped portion of the lower head 11b. It is a mechanism. In that state, the latch 14b is urged to open outward by the latch spring 14d, and engages with the stepped portion at the boundary between the upper head 11a and the lower head 11b, whereby the locking mechanism 14 is pulled out upward. A stop is configured. The locking claw 14c can be engaged with an overshot hung on a wire cable (not shown), and by locking the overshot to the locking claw 14c and pulling it up, the latch retracting case 14e is also pulled up. By raising the tapered portion provided in the window portion for the latch, the latch 14b closes inward and the engagement with the step portion is released, and the lock mechanism 14, the swivel mechanism 13, the inner pipe 15, and the core taker are released. The recess 17 can be lifted and pulled out from the outer pipe 12 for recovery.

As shown in FIG. 2, the swivel mechanism 13 has a support shaft 21 that is connected to the connecting pipe 14a of the lock mechanism 14 and is inserted into the outer pipe 12, and the inner pipe fixing that fixes the base end portion of the inner pipe 15. It includes an inner head 22 as a portion and a bearing 23 as a rotary connection portion for rotatably connecting the support shaft 21 and the inner head 22. The support shaft 21 includes a first shaft body 24 fixed to the connecting pipe 14a of the lock mechanism 14, a second shaft body 25 through which the first shaft body 24 is inserted and connected so as to be able to move forward and backward, and a second shaft body. It is configured to have a third shaft body 26 fixed to the lower side of the 25 and connected to the bearing 23, and a spring member 27 provided over the first shaft body 24 and the second shaft body 25. There is.

The first shaft body 24 of the support shaft 21 has a male screw portion 24a provided at the upper portion and screwed into the connecting pipe 14a, a diameter expansion portion 24b expanded under the male screw portion 24a, and a spring member 27. It is formed to have a spring mounting seat 24c which is a holding portion for holding the upper end side, and a columnar shaft portion 24d extending below the spring mounting seat 24c. The first shaft body 24 is firmly fixed to the lock mechanism 14 by screwing the male screw portion 24a into the connecting pipe 14a and tightening the nut 24e for preventing loosening toward the connecting pipe 14a. There is. Therefore, the first shaft body 24 is supported together with the lock mechanism 14 with respect to the head portion 11 and the outer tube 12 so as not to advance or retreat in the axial direction. Further, a bolt 24f is screwed into the tip of the shaft portion 24d of the first shaft body 24, and the second shaft body 25 is prevented from coming off by the head of the bolt 24f.

The second shaft body 25 of the support shaft 21 is a member having a columnar shape as a whole, and has an insertion hole 25a through which the shaft portion 24d of the first shaft body 24 is inserted, a male screw portion 25b screwed with the third shaft body 26, and the like. It is formed by having a spring mounting seat 25c which is a holding portion for holding the lower end side of the spring member 27, and a stepped portion 25d whose diameter is expanded on the lower end side of the insertion hole 25a. The second shaft body 25 is supported so as to be able to move forward and backward in the axial direction along the shaft portion 24d of the first shaft body 24. The third shaft body 26 includes a bottomed cylindrical tubular portion 26a that opens upward, a female screw portion 26b that extends upward from the tubular portion 26a and is screwed onto the male screw portion 25b of the second shaft body 25, and a cylinder. It is configured to have a shaft portion 26c extending downward from the shaped portion 26a and being inserted into the bearing 23, and a bolt 26d screwed to the tip of the shaft portion 26c to hold the bearing 23. A gap of dimension A'corresponding to dimension A, which is the expansion / contraction distance of the shoe 17a, is provided between the bottom surface 26e of the tubular portion 26a and the head of the bolt 24f. Further, when the second shaft body 25 moves downward, the washer of the bolt 24f is received by the stepped portion 25d, and the height of the stepped portion 25d is the moving distance of the core lifter case 17b in the protruding direction. It is set to the dimension B'corresponding to the dimension B.

According to the swivel mechanism 13 described above, since the inner head 22 is attached to the support shaft 21 via the bearing 23, the inner head 22 and the inner pipe 15, the support shaft 21, the lock mechanism 14, the head portion 11 and the inner head 22 and the inner pipe 15 are attached. The outer tube 12 and the outer tube 12 are rotatably connected to each other. Therefore, when the head portion 11 and the outer tube 12 are rotated by the rotation drive shaft, the inner tube 15 is configured not to rotate together. Further, the first shaft body 24 and the second shaft body 25 of the support shaft 21 are connected to each other so as to be able to move forward and backward, and the spring member 27 is provided so that the inner pipe 15 is immersed in the outer pipe 12. The spring member 27 functions as a compression spring when retracting in the direction, and the spring member 27 functions as a tension spring when the inner tube 15 advances in the protruding direction with respect to the outer tube 12. ing.

Next, the holding structure of the spring member 27 in the support shaft 21 of the swivel mechanism 13 will be described with reference to FIG. FIG. 3 is a cross-sectional view showing the support shaft 21 in a simplified manner. The spring member 27 is composed of a coil spring having a coiled wire, and an intermediate portion thereof is formed with an appropriate wire pitch. Both ends of the spring member 27 are provided with held portions 27a and 27b, which are formed to have a smaller wire pitch than the intermediate portion and are held by the first shaft body 24 and the second shaft body 25, respectively. The first shaft body 24 is provided with a spring mounting seat 24c as a spiral holding portion for holding the held portion 27a of the spring member 27, and a groove portion 24g is formed adjacent to the spring mounting seat 24c. .. The second shaft body 25 is provided with a spring mounting seat 25c as a spiral holding portion for holding the held portion 27b of the spring member 27, and a groove portion 25e is formed adjacent to the spring mounting seat 25c. .. The groove portions 24g and 25e are provided for cutting the spring mounting seats 24c and 25c, and washers 24h and 25f are fitted into the groove portions 24g and 25e, respectively, so that the held portions 27a and 27b come into contact with each other. ing.

The held portions 27a and 27b of the spring member 27 are formed, for example, at a wire pitch in which the wires for one and a half to two turns are brought into close contact with each other. These held portions 27a and 27b are screwed into the spring mounting seats 24c and 25c and are held by the spring mounting seats 24c and 25c in a state of being expanded beyond the wire pitch in the natural state. That is, the screw pitch of the spring mounting seats 24c and 25c is formed to be slightly larger than the wire pitch of the held portions 27a and 27b of the spring member 27 in the natural state. Therefore, the held portions 27a and 27b are screwed into the spring mounting seats 24c and 25c while their wire pitches are widened, and the restoring force of the spring acts on the spring mounting seats 24c and 25c in the holding state. The holding power is increased.

According to the above embodiment, in the spring member 27, when the inner pipe 15 retracts with respect to the outer pipe 12, the spring member 27 functions as a compression spring, and the inner pipe 15 is the outer pipe 12. When the spring member 27 functions as a tension spring when moving forward in the projecting direction, a compression spring for adjusting the projecting dimension A of the shoe 17a for the soft rock layer and a core for the hard rock. The two functions of the tension spring that urges the inner tube 15 and the core lifter case 17b at the time of cutting can be realized by one spring member 27. Therefore, it can be shared for soft rocks and hard rocks, and since it is not necessary to provide two types of springs, a compression spring and a tension spring, the structure can be simplified and shortened.

The first shaft body 24 and the second shaft body 25 of the support shaft 21 are provided with spiral spring mounting seats 24c and 25c for holding the held portions 27a and 27b of the spring member 27, respectively, and are covered by the spring member 27. The holding portions 27a and 27b are held by the spring mounting seats 24c and 25c in a state of being expanded beyond the wire pitch in the natural state, thereby increasing the holding force by the spring and ensuring that both ends of the spring member 27 are held. Can be retained.

It should be noted that the above-described embodiment merely shows a typical embodiment of the present invention, and the present invention is not limited to the embodiment. That is, it can be variously modified and carried out within a range that does not deviate from the gist of the present invention.

FIG. 4 is a cross-sectional view showing a modified example of the swivel mechanism. In the swivel mechanism 13 shown in FIG. 4, an opening 26f is provided in the tubular portion 26a of the third shaft body 26, and the collar 28 can be inserted into the inside of the tubular portion 26a from the opening 26f. .. Further, a bolt 28a is inserted into the tubular portion 26a from the side opposite to the opening 26f, and the collar 28 can be held inside the tubular portion 26a by screwing the bolt 28a into the collar 28. There is. By inserting such a collar 28 into the tubular portion 26a, the gap between the bottom surface 26e of the tubular portion 26a, which is a pair of facing surfaces, and the head of the bolt 24f is filled, and the inner pipe 15 becomes the outer pipe 12 On the other hand, movement that retreats in the immersive direction is restricted. However, since the movement of the inner pipe 15 in the protruding direction is not restricted, it is possible to make the spring member 27 function as a tension spring for urging the inner pipe 15 and the core lifter case 17b when cutting the core of hard rock. Is.

According to the swivel mechanism 13 of such a modification, the retreat of the inner pipe 15 is regulated when the hard rock layer is targeted by restricting the retreat of the inner pipe 15 in the immersion direction by the collar 28 as a regulating part. If the regulation is lifted, the protrusion dimension of the shoe 17a can be adjusted for the soft rock layer, and by exchanging only the parts of the core capture means, switching work for hard rock and soft rock can be performed. Can be done quickly.

Further, in the core sampling device 10 of the above embodiment, a coil spring having a coiled wire is adopted as the spring member 27, but the spring member is not limited to the coil spring and can expand and contract in both directions of the compression spring and the tension spring. Any spring will do. Further, in the above embodiment, the first shaft body 24 and the second shaft body 25 of the support shaft 21 are provided with spiral spring mounting seats 24c and 25c, respectively, to hold the held portions 27a and 27b of the spring member 27. The configuration is adopted, but the configuration is not limited to this, and the configuration of the holding portion and the held portion may be fixed to each other by a fixing tool such as a bolt, or may be fixed by welding or the like.

10 Core sampling device 11 Head part 12 Outer pipe 13 Swivel mechanism 14 Lock mechanism 15 Inner pipe 16 bits 16a Bits for soft rock excavation 16b Bits for hard rock excavation 17 Core intake 17a Shoe 17b Core lifter case 17c Core lifter 21 Support Shaft 22 Inner head (inner pipe fixing part)
23 Bearing (rotary connection)
24 1st shaft body 24c Spring mounting seat (holding part)
24f bolt head (opposing surface)
25 2nd shaft body 25c Spring mounting seat 26 3rd shaft body 26e Bottom surface (opposing surface)
27 Spring members 27a, 27b Held part 28 Collar (regulatory part)

Claims (5)

An outer tube that is rotationally driven by a driving means and has a bit at the tip, an inner tube that is inserted inside the outer tube and has a core intake portion at the tip, and the inner tube that can be rotated with respect to the outer tube. It is a wire line type core sampling device that is provided with a swivel mechanism that supports the inner pipe and that the inner pipe and the swivel mechanism can be lifted and collected by a wire.
The swivel mechanism is
A support shaft inserted into the outer tube and
An inner pipe fixing portion for fixing the base end of the inner pipe,
It has a rotary connection portion that rotatably connects the support shaft and the inner pipe fixing portion.
The support shaft
A first shaft body that is supported so as not to move forward or backward in the axial direction with respect to the outer pipe,
A second shaft body provided so as to be able to move forward and backward in the axial direction together with the inner pipe,
It has a spring member provided over the first shaft body and the second shaft body, and has.
The spring member functions as a compression spring when the inner pipe retracts in the immersion direction with respect to the outer pipe, and serves as a tension spring when the inner pipe advances in the protruding direction with respect to the outer pipe. A core sampling device characterized by functioning. The spring member is a coil spring having a coil-shaped wire, and the wire pitch is formed at both ends thereof to be smaller than that of the intermediate portion, and is held by the first shaft body and the second shaft body, respectively. A held part is provided,
The first shaft body and the second shaft body are each provided with a spiral holding portion for holding the held portion of the spring member.
The core sampling device according to claim 1, wherein the held portion of the spring member is held by the holding portion in a state of being expanded in a state larger than the wire pitch in a natural state. The core sampling device according to claim 1 or 2, wherein the support shaft is provided with a regulating portion that regulates the retreat of the inner tube in the immersion direction. The support shaft has a pair of facing surfaces that approach each other when the inner tube retracts in the immersion direction.
The core sampling device according to claim 3, wherein the regulating unit is a collar inserted and installed between the pair of facing surfaces. When the bit is a bit for soft rock and the core intake portion is a shoe, the spring member functions as a compression spring.
One of claims 1 to 4, wherein the spring member functions as a tension spring when the bit is a bit for hard rock and the core intake portion is a core lifter case and a core lifter. The core sampling device according to paragraph 1.

Images