JP5079835B2 - Wireline drilling rig - Google Patents

Description

  The present invention relates to an excavator used for a wire line method, which is one of borehole methods.

  The wireline drilling apparatus includes an outer tube having a drilling bit at the lower end and an inner tube for collecting the core. The excavation method involves rotating excavation with an outer tube, lifting only the inner tube from which the core was collected from the hole bottom with a wire rope, removing the core, and then returning the empty inner tube to the hole bottom again. It is a method of digging while repeating this. The drilling efficiency and core collection rate are much better than previous methods.

  5 and 6 are schematic configuration diagrams of the wire line excavator disclosed in Patent Document 1. FIG. FIG. 5 is an overall view, FIG. 6A is a perspective development view of the main part, and FIG. 6B is a cross-sectional view of the main part. In FIG. 5, the shaded portion indicates a cross section, and the other portions indicate side surfaces (the same applies to each drawing described later). The wire line excavation device of Patent Document 1 is an improvement of the previous technology in order to reliably recover the core from the soft ground.

  The wireline excavator 101 includes an apparatus main body 102 and a wireline part 103. The apparatus main body 102 has an outer part 104 and an inner part 105. The cylindrical outer portion 104 is installed over almost the entire length of the excavation hole, and is a rod (not shown) that is a transmission steel pipe of a drilling force (rotational driving force), an outer tube 104B connected to the lower side of the rod, And an excavation bit 104c attached to the lower end of the outer tube 104B. The rod and the outer tube 104B are connected by a locking coupling 104A. The adapter coupling 104G provided at the upper end portion of the outer tube 104B is a fixing device when the latch portion 105B of the inner portion 105 is opened. A rotation transmission portion 104D is formed at an intermediate portion of the outer tube 104B.

  On the other hand, the inner portion 105 is disposed in the outer tube 104B, and has a suspension fitting 105A at the upper end, a latch portion 105B connected to the lower end of the suspension fitting, a water supply joint 105G connected to the lower end of the latch portion 105B, A rotation follower 105D connected to the lower end of the joint 105G, a cylindrical inner core tube 105C connected to the lower end of the rotation follower, and a drill bit 105E attached to the lower end of the inner core tube. . The latch portion 105B engages with a notch formed in the outer tube 104B, whereby the inner portion 105 is supported at a predetermined position in the outer portion 104.

  Furthermore, the wireline part 103 is comprised from 103A of wirelines, the overshot assembly 103B connected with the lower end of the wireline, and the lifting dock 103C connected with the lower end of the overshot assembly. The lifting dock 103 </ b> C engages with the suspension fitting 105 </ b> A of the inner portion 105. By pulling the wire line part 103 upward, the latch part 105B of the inner part 105 is detached from the outer tube 104B, and the inner part 105 is lifted to the ground surface.

  Between the outer part 104 and the inner part 105, a water passage gap is provided. As shown in FIG. 6A, a gap 105 or a steadying landing 105 is mounted on the outer peripheral surface of the water supply joint 105G. In this portion, the water passage gap is blocked. Therefore, in order to ensure water flow, water is introduced from the water inlet 105G1 provided above the landing 105F in the water supply joint 105, and below the landing 105F via the water passage 105G2 provided in the water supply joint 105. The water is again discharged from the water outlet 105G3 provided to the gap. The flow of water in the wireline excavator is indicated by a black arrow (the same applies to each figure described later).

  The wire line excavator of Patent Document 1 is configured to transmit the rotational driving force of the outer part to the inner part. The rotation transmission part 104D formed in a part of the outer tube 104B is formed on the inner peripheral surface of the rotation transmission part 104D as shown in the lower part of FIG. 6A (only the half part on the back side of the outer tube is shown). In the circumferential direction, a plurality (even number) of transmission ridges 104D1 are arranged at a predetermined width and interval. Each transmission protrusion 104D1 extends in a predetermined length in the axial direction, and spline fitting grooves 104D2 and spline water passage grooves 104D3 are alternately formed between adjacent transmission protrusions 104D1. On the other hand, a plurality of driven protrusions 105D1 (half of the transmission protrusions 104D1) are arranged in the circumferential direction on the outer peripheral surface of the rotation driven part 105D of the inner part with a predetermined width and interval. The driven protrusion 105D1 is fitted into the spline fitting groove 104D2 of the outer tube. As shown in the cross-sectional view of FIG. 6B, the drilling force is transmitted from the outer portion to the inner portion by fitting the spline fitting groove 104D2 and the driven protrusion 105D1. At the same time, a water passage is secured by the spline water passage groove 104D3.

  As shown in FIG. 5, in the wire line excavation apparatus of Patent Document 1, the lower end of the inner core tube 105C protrudes from the lower end of the outer tube 104B, and the excavation bit 105Q is attached. The rotational driving force of the rod acts on the excavation bit 105 </ b> C of the inner portion 105 by acting on the excavation bit 104 </ b> C of the outer portion 104 and at the same time as the rotational driving force is transmitted from the outer portion 104 to the inner portion 105. Since the inner excavation bit 105Q precedes the outer excavation bit 104C, a core having a size that can be accommodated in the inner core tube 105C can be reliably collected by the core lifter 105I. Further, the core can be collected without being blown away by the water that passes through the tube gap and is ejected from the lower end of the outer tube 104B. This is particularly useful in soft ground.

Japanese Patent Laid-Open No. 10-196266

The wireline excavator of Patent Document 1 has the following points to be improved.
The transmission part of the rotational driving force from the outer part to the inner part shown in FIG. 6 is due to the meshing of both protrusions (the transmission protrusion 104D1 and the driven protrusion 105D1). However, since these protrusions are rectangular plate shapes parallel to the vertical direction, when the inner part 105 suspended by the wire line part 103 is dropped into the outer part 104, the driven protrusion 105D1 of the inner part is The spline fitting groove 104D2 between the two adjacent transmission protrusions 104D1 of the outer portion does not necessarily enter into the spline fitting in one trial. For this reason, the trial may have to be repeated several times before the both are fitted. Repeating trials many times delays work. Moreover, since the frequency | count that the lower end of driven protrusion 105D1 collides with the upper end of transmission protrusion 104D1 increases, it becomes easy to damage.

  In view of the above-described situation, the present invention has an object of reliably fitting a transmission portion of a rotational driving force from an outer portion to an inner portion in one trial when dropping the inner portion in a wireline excavator. .

  In order to achieve the above object, the present invention provides the following configurations. The numbers in parentheses are reference numerals in the drawings described later, and are attached for reference.

A wireline excavation device according to the present invention comprises an apparatus main body (2) and a wireline section (3), and the apparatus main body (2) is a cylindrical outer member having a excavation bit (4C) at the lower end. A portion (4) and an inner portion (5) that is dropped and lifted into the outer portion (4) by the wire line portion (3) and includes a core recovery tube (5C) in the lower portion.
(A) The outer portion (4) is formed on the inner surface of the outer tube (4B), the outer tube (4B) connected to the lower end of the rod, and the outer tube (4B) rotating with the rod. A rotation transmission part (4D) for transmitting the rotation of the outer tube to the inner part (5).
(B) The inner portion (5) includes a rotation driven portion (5D) that transmits rotation from a rotation transmission portion (4D) of the outer tube (4B) on an outer peripheral surface thereof.
(C) The rotation transmission part (4D) comprises a fitting upper part (4D1) having a relatively large inner cylindrical part and a fitting lower part (4D2) having a relatively small inner cylindrical part, The rotation driven portion (5D) includes a fitting upper portion (5D1) and a fitting lower portion (5D2) that can be fitted to the fitting upper portion (4D1) and the fitting lower portion (4D2) of the rotation transmission portion (4D), respectively. And the fitting surface where the fitting lower part (4D2) of the rotation transmission part (4D) and the fitting upper part (5D1) of the rotation driven part (5D) are in contact with each other has three helical fittings. The mating surfaces (4D31, 5D31) and the three vertical fitting surfaces (4D32, 5D32) are alternately arranged in the circumferential direction.

  In a preferred form of the wireline excavator, one of the lowest points of the three helical fitting surfaces (5D31) of the rotary follower (5D) has two other lowest points. Guide protrusions (5D33) projecting downward from the lower point are formed, while the guides are formed on all of the lowest points of the three helical fitting surfaces (4D31) of the rotation transmission part (4D). A guide recess (4D33) that can receive the protrusion (5D33) is formed.

  In a preferred embodiment of the wireline excavator, each of the helical engagement surfaces (4D31, 5D31) of each of the rotation transmission portion (4D) and the rotation driven portion (5D) has a high radial outer side and a radial direction. Inclined so that the inside is lowered.

  In a preferred form of the wire line excavator, the inner portion (5) from the water passage gap (6) between the inner portion (5) and the outer portion (5D) above the rotation follower (5D). 5) The water inlets (5G21, 5G22) formed to allow water to enter the interior of the water inlet (5G21, 5G22) and communicate with the water inlet (5G21, 5G22) through the rotation follower (5D) in the axial direction And a water channel (5D5) for supplying water downward.

  The wire line excavator according to the present invention includes a rotation transmission unit and a rotation driven unit for transmitting a rotational driving force from the outer part to the inner part. The rotation transmission portion and the rotation follower portion each have a large-diameter fitting upper portion and a small-diameter fitting lower portion that are fitted to each other. Furthermore, the fitting surface where the fitting lower part of the rotation transmission part and the fitting upper part of the rotation driven part abut each other are arranged by alternately arranging three helical fitting surfaces and three vertical fitting surfaces in the circumferential direction. Is formed. When the outer portion rotates, the vertical engagement surface of the rotation transmission portion presses the vertical engagement surface of the rotation driven portion, whereby the rotation driven portion of the inner portion rotates.

  In a preferred embodiment, a guide convex portion that protrudes downward from the other two lowest points is formed at one of the lowest points of the three spiral fitting surfaces of the rotary follower. ing. On the other hand, guide recesses are formed at all of the lowest points of the three helical fitting surfaces of the rotation transmission portion. Thereby, when the inner part is dropped into the outer part, first, the guide convex part of the rotation driven part collides with an arbitrary position on one of the three helical fitting surfaces of the rotation transmission part. After the collision, the guide convex portion moves downward along the inclination of the colliding spiral fitting surface. As the guide convex portion moves, the inner portion descends while rotating around the axis. The guide convex portion is finally received in the guide concave portion located at the lowest point thereof. In this way, when the inner part is dropped into the outer part, the rotation transmission part of the outer part and the rotation driven part of the inner part can be reliably fitted in the correct position with a single drop.

  It is preferable that the helical fitting surfaces of the rotation transmission unit and the rotation driven unit are inclined so that the radially outer side is higher and the radial inner side is lower. Thereby, an edge part becomes difficult to be damaged with respect to the impact when dropping an inner part.

  A water inlet for allowing water to enter the inner portion from the water passage gap is formed above the rotation follower, and a water passage communicating with the water inlet passes through the rotation follower in the axial direction. In the fitting portion between the rotation transmission portion and the rotation follower portion, the water passage gap between the outer portion and the inner portion is closed. Therefore, the water sent from above can be sent downward by allowing water to enter the inner part above the fitting part and passing through the inside of the rotation follower.

1 is an overall configuration diagram showing an embodiment of a wireline excavator 1 according to the present invention. It is a figure which shows the principal part of the wireline excavation apparatus shown in FIG. 1 in detail. It is the figure which showed in detail the front (a) and back (b) of the fitting part of rotation transmission part 4D and rotation follower 5D. (A1) is a perspective view of the water supply joint portion 5H, (a2) is a cross-sectional view of A of (a1), (b1) is a perspective view of the check valve portion 5J, and (b2) is (b1). FIG. (C) is the perspective view after the connection of the water supply joint part 5H and the check valve part 5J. It is a schematic whole block diagram of the conventional wireline excavation apparatus. It is a principal part block diagram of the conventional wireline excavation apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings showing examples. The wireline excavation apparatus according to the present invention is an apparatus for performing a drilling, that is, boring, for collecting a core from a formation for geological survey or the like.

  FIG. 1 is an overall configuration diagram schematically showing an embodiment of a wireline excavator 1 according to the present invention. The embodiment of FIG. 1 is an apparatus applied to a relatively soft formation like FIG. 5 of the prior art.

  A schematic configuration will be described with reference to FIG. The wireline excavator 1 is composed of an apparatus main body 2 and a wireline part 3. The apparatus main body 2 includes a cylindrical outer portion 4 and an inner portion 5 installed in the inner space of the outer portion. The wire line part 3 is used to drop and install the inner part 5 in the outer part 4 and lift it, and is similar to that of FIG. 5 of the prior art.

  The outer portion 4 includes a rod (not shown) extending from the ground to the vicinity of the excavation position, and an outer tube 4B connected to the lower end of the rod and having an excavation function. A rocking coupling 4A is provided between the rod and the outer tube. The rod is rotationally driven by a driving device installed on the ground, and the outer tube 4B also rotates together with the rod. A drill bit 4C is attached to the lower end of the outer tube 4B. These components are the same as those in FIG. 5 of the prior art.

  A rotation transmission portion 4D for transmitting the rotation of the outer tube 4B to the inner portion 5 is formed on a part of the inner peripheral surface of the outer tube 4B.

  The inner part 5 comprises the uppermost hanging metal fitting 5A and the latch part 5B, and these components are the same as those of FIG. 5 of the prior art. The adapter coupling 4G provided at the upper end portion of the outer tube 4B is a fixing device when the latch portion 5B of the inner portion 5 is opened.

  Below the latch part 5B of the inner part 5, a rotation driven part 5D that is fitted to the rotation transmission part 4D of the outer tube 4B is connected. Thereby, the rotational driving force is transmitted from the outer part 4 to the inner part 5. By fitting the rotation transmission portion 4D and the rotation driven portion 5D, the water passage gap in this portion is closed. The rotation transmission unit 4D and the rotation driven unit 5D have a characteristic configuration of the present invention.

  Below the rotation follower 5D, a water supply joint 5H, a check valve J and an inner core tube 5C are connected. A drill bit 5Q is attached to the lower end of the inner core tube 5C, and a core lifter 5I is attached in the vicinity of the lower end. The lower end of the inner core tube 5 </ b> C projects downward from the excavation bit 4 </ b> C of the outer portion 4.

  The rotation transmitted to the rotation driven part 5D of the inner part 5 is transmitted to the inner core tube 5C via the water supply joint part 5H and the check valve part 5J. The inner core tube 5C rotates together with the outer tube 4B, and excavates the formation with the excavation bit 5Q to collect the core. In this case, the excavation bit 4C of the outer portion 4 has an auxiliary excavation function.

  In the wireline excavator 1 of the embodiment of FIG. 1, the water supply joint portion 5, the check valve portion J, and the inner core tube 5C that are connected to the lower portion of the rotational follower portion 5D are only examples, depending on the stratum to be applied. Other configurations may be used. For example, a core recovery tube of a type different from the inner core tube 5C may be connected.

  FIG. 2 is a view showing in detail the main part of the present invention in the wireline excavator shown in FIG. 1 and transmitting the rotation from the outer part to the inner part.

  When the inner portion is installed in the outer tube 4B, a predetermined water passage gap 6 is provided between the outer tube 4B and the outer tube 4B. During excavation, water is sent from the upper end of the outer part into the internal space by a pump, and the water passes through the water passage gap 6.

  The parts arranged in the axial direction in the inner portion are basically connected by screwing, and the screwed parts can transmit rotation around the axis. A landing portion 5F is connected to the lower end of the latch portion 5B of the inner portion. The landing portion 5F has a substantially cylindrical shape, and a landing 5F2 for gap adjustment or steadying is attached to the outer periphery. The landing portion 5F is formed with a plurality of water passage grooves 5F1 in the vertical direction in order to secure the water passage gap 6. The water from above flows downward through the water flow groove 5F1 inside the landing 5F2.

  A water inlet 5G is connected to the lower end of the landing part 5F. A rotation follower 5D is disposed at the lower end of the water inlet 5G. In this embodiment, the water inlet 5G and the rotary follower 5D are formed as an integral part. Although not shown, as another example, the water inlet 5G and the rotary follower 5D may be screwed together as separate components. The outer diameter of the water inlet 5G is smaller than the outer diameter of the rotary follower 5D. A plurality of water inlets 5G21, 5G22 formed in the water inlet 5G communicate with a water passage 5D5 that is an internal space of the rotary follower 5D. The water passage 5D5 penetrates the rotation follower 5D in the axial direction. Water from above enters the inside of the inner portion through the water inlets 5G21, 5G22, and flows downward through the water passage 5D5 of the rotation follower 5D. The water inlet 5G22 has a function of removing the sediment by taking the sediment accumulated in the surrounding water passage gap 6 together with water when excavation is performed for a long time.

  A rotation transmission portion 4D is formed on the inner peripheral surface of the cylindrical outer tube 4B. The rotation transmission portion 4D includes a fitting upper portion 4D1 having a cylindrical portion having a relatively large inner diameter, and a fitting lower portion 4D2 having a cylindrical portion having a relatively small inner diameter. On the other hand, a rotational follower 5D is formed on the outer peripheral surface of the cylindrical inner part at the same height as the rotational transmission part 4D. The rotary follower 5D also includes a fitting upper portion 5D1 having a cylindrical portion having a relatively large outer diameter d1, and a fitting lower portion 5D2 having a cylindrical portion having a relatively small outer diameter d2. The fitting upper part 4D1 and the fitting lower part 4D2 of the rotation transmission part 4D can be fitted with the fitting upper part 5D1 and the fitting lower part 5D2 of the rotation driven part 5D, respectively. That is, in the fitted state, the inner peripheral surface of the fitting upper portion 4D1 and the outer peripheral surface of the fitting upper portion 5D1 are in contact with each other, and the inner peripheral surface of the fitting lower portion 4D2 and the outer peripheral surface of the fitting lower portion 5D2 are in contact with each other. In the fitted state, the downward spiral fitting surface 5D31 of the fitting upper portion 5D1 of the rotation driven portion 5D is placed on the upward spiral fitting surface 4D31 of the fitting lower portion 4D2 of the rotation transmission portion 4D. Placed.

  As an example, the outer diameter d1 of the cylindrical portion of the fitting upper portion 5D1 of the rotation driven portion 5D is 100 mm, while the inner diameter of the cylindrical portion of the fitting upper portion 4D1 of the rotating transmission portion 4D fitted to this portion is 103.2. mm. Further, the outer diameter d2 of the cylindrical portion of the fitting lower portion 5D2 of the rotation driven portion 5D is 88.9 mm, while the inner diameter of the cylindrical portion of the fitting lower portion 4D2 of the rotation transmission portion 4D fitted to this portion is 91 mm. . As described above, the inner and outer peripheral surfaces of the rotational transmission portion 4D and the outer peripheral surface of the rotational driven portion 5D are provided with appropriate play for the inner portion to smoothly enter and exit.

  Since the water passage gap 6 is closed at the place where the rotation transmission portion 4D and the rotation driven portion 5D are fitted, water cannot flow through the water passage gap 6. Therefore, the water passage 5D5 of the rotation follower 5D serves as a detour that allows water from above to pass downward.

  A water supply joint 5H is connected to the lower end of the rotation follower 5D. The water supply joint 5H has a cylindrical shape, and the water passage 5H3 which is an internal space communicates with the water passage 5D5 of the rotation follower 5D. By connecting the check valve portion 5J to the lower end of the water supply joint portion 5H, the bottom opening of the water supply joint portion 5H is closed. A plurality of water outlets 5H2 pass through the cylindrical wall from the water passage 5H3 and open to the water passage gap 6. Water from above passes through the water passage 5D5 and the water passage 5H3, and again flows out from the water outlet 5H2 to the water passage gap 6.

  FIG. 3 is a diagram showing in detail a fitting portion between the rotation transmission portion 4D of the outer portion and the rotation driven portion 5D of the inner portion. The upper figure of (a) is the perspective view seen from the front side of rotation follower 5D, and the lower figure is the perspective view of the half part by the side of the back of rotation transmission part 4D. The upper figure of (b) is a perspective view seen from the back side of rotation follower part 5D, and the lower figure is a perspective view of the half part of the front side of rotation transmission part 4D. A white arrow indicates a movement in which the rotation driven portion 5D is fitted to the rotation transmission portion 4D from above.

  The fitting surface that forms the boundary between the fitting upper portion 4D1 and the fitting lower portion 4D2 in the rotation transmission portion 4D is the three helical fitting surfaces 4D31 and the uppermost and lowermost points of the adjacent helical fitting surfaces 4D31. Are formed by alternately arranging three vertical fitting surfaces 4D32 in the circumferential direction. On the other hand, the fitting surface that forms the boundary between the fitting upper portion 5D1 and the fitting lower portion 5D2 in the rotation driven portion 5D is the three helical fitting surfaces 5D31 and the highest point of the adjacent helical fitting surfaces 5D31. Three vertical fitting surfaces 5D32 connecting the lower points are alternately arranged in the circumferential direction.

  In FIG. 3, the direction of rotation is indicated by an arrow. The vertical fitting surface 4D32 of the rotation transmission unit 4D faces the rotation direction, and the vertical fitting surface 5D32 of the rotation driven unit 5D faces the direction opposite to the rotation direction. In such a configuration, when the rotation transmission unit 4D rotates as indicated by an arrow, the vertical fitting surface 4D32 of the rotation transmission unit 4D pushes the vertical fitting surface 5D32 of the rotation driven unit 5D, whereby the rotation driven unit 5D rotates. To do.

  In addition, it is preferable that both helical fitting surfaces 4D31 and 5D31 are inclined so that the radially outer side is higher and the radially inner side is lower. This is to make it difficult to damage the edge portion against an impact when the inner portion is dropped.

  Furthermore, a guide convex portion 5D33 that protrudes downward from the other two lowest points is formed at one of the lowest points of the three spiral fitting surfaces 5D31 of the rotation driven portion 5D. Yes. On the other hand, guide recesses 4D33 are formed at all of the lowest points of the three helical fitting surfaces 4D31 of the rotation transmission portion 4D. Here, the white arrow in the lower diagram of FIG. When the inner part is dropped into the outer part, first, the guide convex part 5D33 of the rotation driven part 5D collides with an arbitrary position in one of the three helical fitting surfaces 4D31 of the rotation transmission part 4D. After the collision, the guide protrusion 5D33 moves downward along the inclination of the collided spiral fitting surface 4D31. As the guide convex portion 5D33 moves, the inner portion descends while rotating around the axis. The guide convex portion 5D33 is finally received in the guide concave portion 4D33 located at the lowest point thereof. In this way, when the inner part is dropped into the outer part, the rotation transmission part 4D of the outer part and the rotation driven part 5D of the inner part can be reliably fitted in the correct position by one drop.

  Thus, in rotation transmission from the outer part to the inner part, it is optimal to combine the helical fitting surface and the vertical fitting surface. For example, it is not preferable to configure only the spiral fitting surface because the rotational force of the outer portion is converted into excessive force in the vertical direction and the inner portion is lifted. Moreover, when it comprises only a vertical fitting surface, as stated in the above-mentioned prior art, when the inner part is dropped, it is difficult to fit it at a correct position at a time.

  Fig. 4 (a1) is a perspective view of the water supply joint 5H, and (a2) is a cross-sectional view of A of (a1). 4B1 is a perspective view of the check valve portion 5J, and FIG. 4B2 is a cross-sectional view of (b1). FIG.4 (c) is a perspective view after the connection of the water supply joint part 5H and the check valve part 5J.

  The check valve portion 5J includes a water inlet 5J2 opened at the upper end of the inner space of the inner core tube 5C in FIG. 1, and a ball valve 5J1 installed in the water inlet 5J2. Inside the check valve portion 5J, there is formed a water passage 5J3 that communicates with the water inlet 5J2 and extends in the horizontal direction, and the water passage 5J3 is open to the water passage gap. The check valve section 5J enters water from the inner space of the inner core tube 5C, guides the water to the water passage gap, and discharges the water. Thereby, a core can be smoothly accommodated in the inner core tube 5C. The inner core tube 5C is connected to a screw portion 5J4 on the outer periphery of the lower portion of the check valve portion 5J.

1: Wireline drilling device 2: Device main unit 3: Wireline portion 3A: Wireline 3B: Overshot assembly 3C: Lifting dock 4: Outer portion 4A: Rocking coupling 4B: Outer tube 4C: Drilling bit 4D: Rotation transmission Part
4G: Adapter coupling 5: Inner part 5A: Hanging metal fitting 5B: Latch part 5C: Inner core tube 5D: Rotation driven part 5F: Landing part 5G: Incoming part 5H: Water supply joint part 5J: Check valve part 5I: Core lifter 5Q : Drilling bit

Claims (4)

An apparatus main body (2) and a wire line part (3), the apparatus main body (2) is a cylindrical outer part (4) having a drilling bit (4C) at the lower end, and the wire line In the wire line excavator (1) having an inner part (5) that is dropped and installed in the outer part (4) by the part (3) and is provided with a core recovery tube (5C) in the lower part,
(A) The outer portion (4) is formed on the inner surface of the outer tube (4B), the outer tube (4B) connected to the lower end of the rod, and the outer tube (4B) rotating with the rod. A rotation transmission part (4D) for transmitting the rotation of the outer tube to the inner part (5),
(B) The inner portion (5) includes a rotation driven portion (5D) that transmits rotation from the rotation transmission portion (4D) of the outer tube (4B) on an outer peripheral surface thereof.
(C) The rotation transmission part (4D) comprises a fitting upper part (4D1) having a relatively large inner cylindrical part and a fitting lower part (4D2) having a relatively small inner cylindrical part, The rotation driven portion (5D) includes a fitting upper portion (5D1) and a fitting lower portion (5D2) that can be fitted to the fitting upper portion (4D1) and the fitting lower portion (4D2) of the rotation transmission portion (4D), respectively. And the fitting surface where the fitting lower part (4D2) of the rotation transmission part (4D) and the fitting upper part (5D1) of the rotation driven part (5D) are in contact with each other has three helical fittings. A wireline excavator characterized by being formed by alternately arranging mating surfaces (4D31, 5D31) and three vertical fitting surfaces (4D32, 5D32) in the circumferential direction.   One of the lowest points of the three helical fitting surfaces (5D31) of the rotation follower (5D) has a guide convex portion protruding downward from the other two lowest points ( 5D33) is formed, and at the lowest point of the three helical fitting surfaces (4D31) of the rotation transmission part (4D), a guide recess (5D33) that can receive the guide protrusion (5D33). The wire line excavator according to claim 1, wherein 4D33) is formed.   The spiral fitting surfaces (4D31, 5D31) of each of the rotation transmission portion (4D) and the rotation driven portion (5D) are inclined so that the radially outer side is high and the radial inner side is low. The wireline excavator according to claim 1 or 2, characterized in that In order to allow water to enter the inner portion (5) from the gap (6) through the water passage between the inner portion (5) and the outer driven portion (5D) above the rotary follower portion (5D). The formed water inlet (5G21, 5G22),
A water passage (5D5) for communicating with the water inlet (5G21, 5G22) and passing through the rotational follower (5D) in the axial direction and feeding water downward is provided. 4. The wire line excavator according to any one of 3 above.

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