JP4748692B1 - Equipment for extracting underground objects - Google Patents

Abstract

An object of the present invention is to provide a low-cost underground object extraction device with a simple structure and easy maintenance.
SOLUTION: A cylindrical casing 11 connected to a rotor side of an excavating motor 7 that is lifted and lowered by a lifting device 2 is provided between a retracted position that does not interfere with the buried object P and a support position that supports the buried object P. The support member 21 is attached so as to be displaceable so that it can be displaced by the above. An actuator 30 for displacing the support member 21 with respect to the casing 11 is attached to the stator side of the motor 7. A first transmission member 31 that is displaced in the direction of the rotation axis of the casing 11 by the movement of the operating portion of the actuator 30, and a second transmission member 32 that is attached to the casing 11 so as to be displaceable in the rotation axis direction and to be able to rotate along the rotation axis. They are arranged to oppose each other so as to be able to move together in the direction of the rotation axis and to be able to rotate relative to each other around the rotation axis. With the displacement of the second transmission member 32 with respect to the casing 11, the support member 21 can be displaced with respect to the casing 11.
[Selection] Figure 1

Description

  The present invention relates to an apparatus for extracting a buried object such as a foundation pile from the ground.

  As a device for extracting underground objects, a cylindrical casing attached to the rotor side of a digging motor that is lifted and lowered by a lifting device so as to be lifted and lowered with the motor, and the casing is rotated by the motor. The excavation member attached to the casing, the retreat position that does not interfere with the embedding object in the casing, and the inside of the casing from the retreat position so that the surrounding area of the underground object can be excavated is supported. A device including a support member that is detachably attached to the casing and a hydraulic actuator that displaces the support member with respect to the casing so that the support member can be displaced between the support positions is used. By pulling up the casing after the excavation, the buried object supported by the support member located at the support position is pulled out from the ground.

  Conventionally, a hydraulic actuator that displaces a support member with respect to a casing has been attached to the casing (see Patent Documents 1 and 2). However, when a hydraulic actuator is attached to the casing connected to the rotor side of the excavating motor, the hydraulic oil is supplied between the stator side and the rotor side of the excavating motor in order to supply hydraulic oil to the hydraulic actuator. It is necessary to provide a swivel joint for oil supply. However, if such a swivel joint is provided, the cost increases, and maintenance management becomes troublesome because it is necessary to cope with oil leakage.

  Therefore, it has been proposed that not only a hydraulic actuator is attached to the casing but also a hydraulic oil tank, pump, pump drive motor, solenoid valve, control unit, etc. are attached to the casing, thereby eliminating the need for a swivel joint (patent) Reference 3).

Japanese Patent No. 3052135 Japanese Patent Publication No. 3-57247 Japanese Patent No. 3955873

  In the technique described in Patent Document 3, the trolley wire on the stator side of the excavating motor and the contact on the casing side are brought into sliding contact with each other in order to supply power to an electromagnetic valve or a control unit provided in the casing. For this reason, the structure of the electric system becomes complicated and a failure is likely to occur. In addition, the rotating casing is easily subjected to an impact during excavation, and the control unit and the like provided in such a casing are liable to be damaged or broken, and maintenance management becomes troublesome. An object of the present invention is to provide a device for extracting underground objects that can solve such a problem.

The present invention relates to a cylindrical casing that is driven to rotate by the motor and connected to the rotor side of the excavating motor that is lifted and lowered by the lifting device, and is connected to the motor to be lifted and lowered. The excavation member attached to the casing, a retracted position that does not interfere with the embedded object in the casing, and the inside of the casing more than the retracted position so that the surrounding area of the underground object can be excavated by rotating A support member attached to the casing so as to be displaceable, and an actuator for displacing the support member relative to the casing. After the casing is pulled up later, it is supported by the support member disposed at the support position. It applied to the pulling device of the underground buried object pulling the buried object from the ground.
In the underground buried object extraction device according to the present invention, the actuator is attached to the stator side of the motor, and is moved to the rotating portion of the casing by the movement of the operating portion of the actuator. Along with the displacement of the second transmission member relative to the casing, the first transmission member connected, the second transmission member attached to the casing so as to be displaceable in the direction of the rotation axis and to be able to rotate along the rotation axis A connecting mechanism that connects the second transmission member and the support member so that the support member can be displaced between the retracted position and the support position; and the first transmission member and the second transmission member , the the rotation axis direction can accompany the movement and as relatively rotatably pressed against each other about the rotation axis, is disposed to face the first transmission The material has a first pressing portion, the first pressing portion has a first surface and a second surface arranged with an interval in the rotation axis direction, and the second transmission member is a second pressing member. The second pressing portion includes a first surface facing the first surface of the first pressing portion and a second surface facing the second surface of the first pressing portion. A first surface and a second surface are formed in the casing at an interval in the direction of the rotation axis, and the space between the first surface and the second surface of the casing. The first portion and the second surface of the casing are arranged such that the restriction portion is disposed and the second transmission member is displaceable by a certain distance in the rotation axis direction with respect to the casing. The interval in the rotation axis direction is larger than the size of the restricting portion in the rotation axis direction, Due to the displacement of the first transmission member in one direction of the rolling axis, the first surface of the first pressing portion is pressed against the first surface of the second pressing portion, and the restricting portion is moved to the first side of the casing. By pressing against the first surface, the displacement of the support member from the retracted position is restricted, and the second surface of the first pressing portion is displaced by the displacement of the first transmission member in the other direction of the rotation axis. Is pressed against the second surface of the second pressing portion, and the restricting portion is pressed against the second surface of the casing, whereby the support member is restricted from being displaced from the support position. The distance in the rotation axis direction between the first surface and the second surface of the pressing portion is the distance in the rotation axis direction between the first surface and the second surface of the second pressing portion. By being different, the first pressing The space | interval of the said rotating shaft direction is provided between the part and the said 2nd pressing part, It is characterized by the above-mentioned.
According to the present invention, when the first transmission member is displaced in the direction of the rotation axis of the casing due to the movement of the operating portion of the actuator, the second transmission member pressed against the first transmission member is displaced in the direction of the rotation axis with respect to the casing. . With the displacement of the second transmission member relative to the casing, the support member can be displaced between the retracted position and the support position with respect to the casing. At this time, since the first transmission member and the second transmission member can be relatively rotated around the rotation axis, the rotation of the casing is not hindered. That is, even if an actuator for displacing the support member relative to the casing is attached to the stator side of the excavation motor, the support member can be displaced between the retracted position and the support position without hindering the rotation of the casing. it can. Therefore, since it is sufficient to supply hydraulic oil, electric power, etc. for operating the actuator to the stator side of the excavating motor, it is not necessary to provide a swivel joint between the stator side and the rotor side.

  It is preferable that at least one of the two transmission members has a rolling element so that the first transmission member and the second transmission member are in rolling contact with each other. Thereby, a support member can be smoothly displaced with respect to a casing.

  According to the present invention, it is possible to provide a low-cost underground buried object extraction device that has a simple structure and is easy to maintain.

The side view which shows the extraction apparatus of the underground buried object which concerns on embodiment of this invention The front view which shows arrangement | positioning of the actuator in the drawing-out apparatus of the underground buried object which concerns on embodiment of this invention The side view which shows arrangement | positioning of the actuator in the drawing-out apparatus of the underground buried object which concerns on embodiment of this invention Sectional drawing for structure description of the principal part in the drawing-out apparatus of the underground buried object which concerns on embodiment of this invention Sectional drawing for structure description of the supporting member in the drawing-out apparatus of the underground buried object which concerns on embodiment of this invention Sectional view taken along line VI-VI in FIG. VII-VII line sectional view of FIG. Structure explanatory drawing concerning the 1st modification of the present invention Structure explanatory drawing concerning the 2nd modification of the present invention

  The drawing device 1 according to the embodiment of the present invention shown in FIG. 1 includes a casing 11 attached to a travelable lifting device 2 exemplified by a truck crane via a motor 7 for excavation, and an underground buried object such as an existing pile. Used to pull out P. The truck crane has a swivel base 4 attached to the vehicle body 3 so as to be rotatable around the vertical axis. The boom 5 can be driven to swing around the horizontal axis so that the tip of the swivel 4 can be moved up and down and can be expanded and contracted. It is attached. The excavation motor 7 is attached to the tip of the boom 5 so as to be swingable about the horizontal axis, and is moved up and down as the boom 5 swings and expands and contracts.

  As shown in FIGS. 2 and 3, the excavating motor 7 has a housing 7 a integrated with the stator and an output shaft 7 b integrated with the rotor. The housing 7 a on the stator side covers the boom 5 with the cover 8. And are connected so as to be able to swing relative to each other.

  As shown in FIGS. 4 and 5, the casing 11 has a stepped cylindrical shape, and is configured by joining a plurality of cylindrical members 11 a, 11 b, 11 c, and 11 d, and a connecting shaft 12 is a reinforcing member at the upper end portion. 13 is attached by welding or the like. The connecting shaft 12 is connected to the output shaft 7b of the motor 7 so as to be able to rotate together and move in the axial direction. For example, the connecting shaft 12 has a hexagonal column shape, is inserted into a hexagonal hole formed in the output shaft 7b, and the connecting pin is inserted into the connecting shaft 12 and the output shaft 7b, whereby the connecting shaft 12 and the output shaft 7b are connected. Is done. As a result, the casing 11 is connected to the rotor side of the motor 7 so as to move up and down along with the motor 7 and is rotated by the motor 7 with its own central axis as the rotation axis. A drilling blade is attached as a drilling member 14 to the lower end of the casing 11 so that the surrounding area of the buried object P can be excavated by rotating the casing 11 by the motor 7. As a result, the casing 11 can enter the ground so as to surround the buried object P while rotating around the rotation axis. In this embodiment, a pipe 15 extending from the axial center of the connecting shaft 12 to the lower outer periphery of the casing 11 is provided, and water or the like is supplied to the vicinity of the lower end of the casing 11, so that the surrounding area of the buried object P is softened. It is possible. In order to assist the propulsion of the casing 11 in the ground, a spiral blade 16 may be provided on the outer periphery of the casing 11 as indicated by a chain line in FIG.

  As shown in FIGS. 5 and 7, a support member 21 is detachably attached to the peripheral wall of the casing 11. The support member 21 may be a single member or a plurality of members. In the present embodiment, the number of support members 21 is three, and they are arranged at equal intervals in the circumferential direction. Each support member 21 is attached to a bracket 22 fixed to the casing 11 so as to be swingable around the axis of the support shaft 23 between both ends thereof. The axis of the support shaft 23 is parallel to the plane orthogonal to the central axis of the casing 11. An opening 11 ′ is formed in the casing 11 so that the support member 21 does not interfere with the casing 11 when swinging. Thereby, each support member 21 can be displaced between the retracted position and the support position by swinging with respect to the casing 11. The support member 21 in the retracted position has a posture in which the distal end side is located along the peripheral wall of the casing 11 and the proximal end side is located outside the casing 11 as shown by a chain line in the drawing, and does not interfere with the embedded object P in the casing 11. The support member 21 at the support position has a posture in which the tip end side protrudes inside the casing 11 and the base end side is located outside the casing 11 as shown by a solid line in the drawing, and the buried object P surrounded by the casing 11 after excavation. The embedded object P is supported on the inner side of the casing 11 than the retracted position. Note that the support member 21 may be pressed against the outer peripheral surface of the embedded object P at the support position, and the embedded object P may be supported and pulled up by frictional force.

  As shown in FIGS. 2 and 3, an actuator for displacing the support member 21 with respect to the casing 11 is attached to a cover 8 integrated with a housing 7 a on the stator side of the motor 7. The actuator according to the present embodiment includes a pair of hydraulic cylinders 30 that are disposed so as to sandwich the motor 7. A hydraulic control device (not shown) for expanding and contracting the hydraulic cylinder 30 is provided on the stator side of the motor 7 and the lifting device 2 side. A cylinder tube 30a of each hydraulic cylinder 30 constituting the actuator body is connected to a bracket 9 integrated with the cover 8 via a link pin 9a so as to be able to move along the rotational axis.

  The first transmission member 31 is connected to the piston rod 30b of the hydraulic cylinder 30 that constitutes the operating portion of the actuator so as to reciprocate in the rotational axis direction of the casing 11 by the movement of the piston rod 30b. That is, the first transmission member 31 of the present embodiment is welded to the flat box-shaped connecting portion 31a, the flat cylindrical intermediate portion 31b attached to the lower surface of the connecting portion 31a with a bolt, and the lower surface of the intermediate portion 31b. The piston rod 30b is connected via a link pin 31 ″ to a bracket 31 ′ integrated with the upper surface of the connecting portion 31a. The moving direction of 30b is assumed to be along the rotational axis direction, whereby the first transmission member 31 is supported by the stator side of the motor 7 via the actuator 30, and the rotational axis direction is moved by the movement of the piston rod 30b. 4, the connecting shaft 12 and the reinforcing member 13 are formed in the first transmission member 31 so as not to interfere with the first transmission member 31. 3, in this embodiment, the first transmission member 31 is attached to the cover 8 so that the first transmission member 31 is smoothly displaced in the direction of the rotation axis by the expansion and contraction of the hydraulic cylinder 30, as shown in FIG. A guide portion 31d that slides relative to the guide 8a is provided in the connecting portion 31a, but such a guide 8a and guide portion 31d are not essential. You may fix to the housing 7a etc. by the side of a stator.

  As shown in FIGS. 4 and 6, the second transmission member 32 is attached to the upper portion of the casing 11 so as to be reciprocally displaceable in the direction of the rotation axis of the casing 1 and to be able to rotate along the rotation axis. That is, the second transmission member 32 of the present embodiment includes a cylindrical fitting portion 32a, a restriction portion 32b attached to the inner periphery of the fitting portion 32a, and an upper flange 32c that projects from the upper outer periphery of the fitting portion 32a. And a lower flange 32d protruding from the lower outer periphery of the fitting portion 32a. The fitting portion 32a is fitted on the outer periphery of the casing 11 so as to be slidable in the direction of the rotation axis. An opening 11 f is formed in the casing 11. The opening 11f may be single or plural, and is three in this embodiment, and is arranged at equal intervals in the circumferential direction. The number of restriction portions 32b is the same as the number of openings 11f. After fitting the fitting portions 32a into the casing 11, the restriction portions 32b are fitted into the openings 11f and fixed to the fitting portions 32a via bolts, nuts, and reinforcing plates 32e. The The dimension L1 of the opening 11f in the rotation axis direction is larger than the dimension L2 of the restricting part 32d, and the dimension of the opening 11f in the circumferential direction of the casing 11 and the dimension of the restricting part 32d are substantially equal. Thus, the second transmission member 32 can be displaced in the rotational axis direction with respect to the casing 11 by a distance L3 corresponding to the difference between the dimension L1 of the opening 11f and the dimension L2 of the restricting portion 32d in the rotational axis direction. In addition, the second transmission member 32 can be rotated together with the casing 11 around the rotation axis by contacting the inner surface of the opening 11f with the outer surface of the restricting portion 32d.

  As shown in FIGS. 4, 5, and 7, the support member 21 can be displaced between the retracted position and the support position in accordance with the displacement of the second transmission member 32 with respect to the casing 11 in the rotational axis direction. A connection mechanism 40 for connecting the second transmission member 32 and the support member 21 is provided. The connection mechanism 40 of the present embodiment converts the displacement of the second transmission member 32 relative to the casing 11 in the direction of the rotation axis into the displacement of the support member 21 relative to the casing 11, and is connected to the lower flange 32 d of the second transmission member 32. The fixed first connecting rod 40a, the second connecting rod 40c whose upper end is connected to the lower end of the first connecting rod 40a via the link pin 40b, and the link pin 40d to the lower end of the second connecting rod 40c The lower end of the third connecting rod 40e is connected to the base end side of the support member 21 via the link pin 40f. As a result, the support member 21 is displaced from the retracted position to the support position with respect to the casing 11 along with the displacement of the second transmission member 32 in one direction (upward in the illustrated example) along the rotation axis with respect to the casing 11. As the second transmission member 32 is displaced in the other direction (downward in the illustrated example) along the rotation axis, the support member 21 is displaced from the support position to the retracted position with respect to the casing 11. In addition, the 2nd connecting rod 40c is penetrated by the through-holes 11a 'and 11b' formed in the flange for connecting the cylindrical members 11a and 11b of the casing 11, and the flange for connecting the cylindrical members 11b and 11c The third connecting rod 40e is inserted into the through holes 11b ", 11c" formed in the above. The connecting rods 40c, 40d are guided by the inner surfaces of the through holes 11a ', 11b', 11b ", 11c" so as to be displaced in the direction of the rotation axis, and the support member 21 is swung around the axis of the support shaft 23. The inner surface of each through hole 11a ', 11b', 11b ", 11c" and each of the connecting rods 40c, 40e so that a slight displacement in the radial direction of each connecting rod 40c, 40d is allowed when moving. A gap is provided between them.

  As shown in FIGS. 4 and 6, the first transmission member 31 has a first pressing portion 31f, and the second transmission member 32 has a second pressing portion 32f.

  The first pressing portion 31f includes a plurality of first rolling elements 31f ′ and a plurality of second rolling elements 31f ″. The number of first rolling elements 31f ′ is three in the present embodiment, and in the circumferential direction. Each of the first rolling elements 31f ′ is a cylindrical roller, and the holding member 31g attached to the lower surface of the intermediate portion 31b of the first transmission member 31 has a shaft along the radial direction of the casing 11. In this embodiment, the number of the second rolling elements 31f ″ is three, and they are arranged at equal intervals in the circumferential direction. Each of the second rolling elements 31f ″ is a cylindrical roller, and can be rotated around an axis along the radial direction of the casing 11 by a holding member 31i attached to the lower end of the extending portion 31c of the first transmission member 31 with a bolt or the like. Is attached via a holding shaft 31j.

The second pressing portion 32f is composed of an upper surface 32f 'and a lower surface 32f "of the upper flange 32c of the second transmission member 32. The upper surface 32f' of the upper flange 32c faces the first rolling element 31f 'and is the upper flange. The lower surface 32f ″ of 32c faces the second rolling element 31f ″. Thereby, the first transmission member 31 and the second transmission member 32 are arranged to face each other, and can move along the rotation axis and rotate. In this embodiment, they are pressed against each other via the pressing portions 31f and 32f so as to be relatively rotatable around the shaft, and in this embodiment, the rotation shaft is interposed between the first pressing portion 31f and the second pressing portion 32f as shown in FIG. provided direction of spacing S is, the first transmission member 31 smooth relative rotation of the second transmission member 32 that has been achieved.

In order to pull out the underground article P by the pulling device 1, first, the casing 11 is rotated by the motor 7, and the motor 7 is lowered by the lifting device 2. Accordingly, the casing 11 is caused to enter the peripheral flow area of the buried object P while excavating the surrounding area of the buried object P by the excavating member 14.
During the excavation, the piston rod 30b is operated so that the hydraulic cylinder 30 extends, and the movement of the piston rod 30b displaces the first transmission member 31 downward with respect to the casing 11 along the rotational axis direction. Along with the downward displacement of the first transmission member 31, the second transmission member 32 is displaced downward. At this time, when the second transmission member 32 is not displaced downward by its own weight due to friction between the inner periphery of the second transmission member 32 and the outer periphery of the casing 11, the outer peripheral surface of the first rolling element 31 f ′ in the first transmission member 31. However, in a state in which the second transmission member 32 is pressed against the upper surface 32f ′ of the upper flange 32c of the second transmission member 32, the second transmission member 32 is displaced downward. In addition, if no large friction acts between the inner periphery of the second transmission member 32 and the outer periphery of the casing 11, the outer peripheral surface of the second rolling element 31 f ″ in the first transmission member 31 is in the second transmission member 32. In a state where the second transmission member 32 is pressed against the lower surface 32f ″ of the upper flange 32c, the second transmission member 32 is displaced downward by its own weight. As the second transmission member 32 is displaced downward with respect to the casing 11, the support member 21 is displaced with respect to the casing 11, so that the support member 21 can be disposed at the retracted position. The downward displacement of the second transmission member 32 is restricted by the restricting portion 32b coming into contact with the inner peripheral lower surface of the opening 11f. At this time, the outer peripheral surface of the first rolling element 31f 'is pressed against the upper surface 32f' of the upper flange 32c. Then, the displacement of the support member 21 from the retracted position can be restricted by pressing the restricting portion 32b against the inner peripheral lower surface of the opening 11f.
The piston rod 30b is operated so that the hydraulic cylinder 30 contracts after excavation, and the first transmission member 31 is displaced upward along the rotational axis direction with respect to the casing 11 by the movement of the piston rod 30b. As a result, the outer peripheral surface of the second rolling element 31 f ″ in the first transmission member 31 is pressed against the lower surface 32 f ″ of the upper flange 32 c in the second transmission member 32, and the second transmission member 32 is accompanied with the first transmission member 31. Then, the casing 11 is displaced upward along the rotational axis direction. As the second transmission member 32 is displaced upward with respect to the casing 11, the support member 21 is displaced with respect to the casing 11, whereby the support member 21 can be disposed at the support position. The upward displacement of the second transmission member 32 is restricted by the restricting portion 32b coming into contact with the inner peripheral upper surface of the opening 11f. At this time, the outer peripheral surface of the second rolling element 31f ″ is pressed against the lower surface 32f ″ of the upper flange 32c. Then, the displacement of the support member 21 from the support position can be restricted by pressing the restricting portion 32b against the inner peripheral upper surface of the opening 11f. Thereafter, the casing 11 is pulled up together with the motor 7 by the elevating device 2, whereby the buried object P supported by the support member 21 disposed at the support position is pulled out from the ground.

  According to the above-described extraction device 1, when the first transmission member 31 is displaced in the rotation axis direction of the casing 11 by the movement of the piston rod 30 b of the hydraulic cylinder 30, the second transmission member 32 pressed against the first transmission member 31 is the casing. 11 is displaced in the direction of the rotation axis. With the displacement of the second transmission member 32 in one direction relative to the casing 11, the support member 21 can be displaced from the retracted position to the support position with respect to the casing 11, and the second transmission member 32 relative to the casing 11 in the other direction. With the displacement, the support member 21 can be displaced from the support position to the retracted position with respect to the casing 11. At this time, since the first transmission member 31 and the second transmission member 32 are relatively rotatable around the rotation axis, the rotation of the casing 11 is not hindered. That is, even if the hydraulic cylinder 30 for displacing the support member 21 with respect to the casing 11 is attached to the stator side of the excavating motor 7, the support member 21 is moved to the retracted position and the support position without hindering the rotation of the casing 11. Can be displaced between. Therefore, since it is sufficient to supply the hydraulic oil for operating the hydraulic cylinder 30 to the stator side of the excavating motor 7, it is not necessary to provide a swivel joint between the stator side and the rotor side. Further, since the first transmission member 31 and the second transmission member 32 are in rolling contact with each other through the rolling elements 31f ′ and 31f ″, the support member 21 can be smoothly displaced with respect to the casing 11.

The present invention is not limited to the above embodiment.
For example, the support member is not limited to one that swings, and as shown in the first modification of FIG. 8, the support member 21 moves linearly in the direction perpendicular to the rotation axis (the direction of arrow α in FIG. 8). Therefore, it may be supported by the casing 11 so as to be displaced between the support position and the retracted position. The connection mechanism 40 in this case includes, for example, a rack 40h that moves together with the support member 21, a rack 40i that is connected to the third connecting rod 40e so as to be displaced in the rotation axis direction along with the second transmission member, It can be comprised by what has the pinion 40j attached to the casing 11 so that it may mesh | engage with both racks 40h and 40i. Others are the same as in the above embodiment, so that the support member 21 is displaced to the retracted position in accordance with the upward displacement of the second transmission member 32 along the rotational axis direction, and the second transmission member is moved downward along the rotational axis direction. With the displacement, the support member 21 is displaced to the support position.
Moreover, in the connection mechanism 40 of the said embodiment, although the 2nd transmission member 32 and the base end side of the supporting member 21 are connected via connection rod 40a, 40c, 40e, such connection rod 40a, 40c, Instead of 40e, the second transmission member 32 and the base end side of the support member 21 may be connected by a wire 40m as shown in a second modification of FIG. Others are the same as in the above embodiment, and as the second transmission member 32 is displaced upward along the rotational axis direction, an upward pulling force is applied to the proximal end side of the support member 21 by the wire 40m, and the support member 21 21 can be displaced to the support position. Further, by loosening the pulling force applied by the wire 40m to the proximal end side of the support member 21 in accordance with the downward displacement of the second transmission member along the rotational axis direction, the support member 21 has its own weight, the weight of the wire 40m, and the like. Can be displaced to the retracted position. In FIG. 9 (1), the support member 21, which has been pulled upward by the wire 40 m, is pressed against the outer peripheral surface of the embedded object P, and the frictional force between the support member 21 and the embedded object P is applied. A state in which the supported buried object P is pulled up above the ground G is shown. (2) in FIG. 9 shows a state where the tensile force applied by the wire 40m is loosened. In the state of (2) in FIG. 9, the support member 21 may bite into the embedded object P and cannot be displaced to the retracted position. Therefore, when the embedded member P is supported by pressing the support member 21 against the outer peripheral surface of the embedded object P using the wire 40m, the support member 21 is supported in a state where the tip of the embedded object P projects downward from the lower end of the casing 11. Is preferred. 9, the casing 11 is lowered by the lifting device in the state of (2) in FIG. 9, and the embedded object P is caused to collide with the ground G, whereby a force for pushing up the embedded object P acts on the casing 11. Accordingly, the biting of the support member 21 into the embedded object P can be released, and the support member 21 can be displaced to the retracted position.
The object to be extracted according to the present invention is not limited to an existing pile as long as it is an underground object. For example, an obstacle embedded in the ground may be extracted by the extraction device of the present invention.
The actuator is not limited to a hydraulic cylinder, and may be, for example, a hydraulic motor having a rotating shaft. In this case, a rack that meshes with a pinion connected to the rotating shaft is attached to the first transmission member, and the rotation of the pinion is transmitted to the rack. Thus, the first transmission member may be displaced in the direction of the rotation axis of the casing. The actuator may be an electric actuator instead of a hydraulic actuator.
In the above embodiment, the first transmission member has rolling elements, but the second transmission member may have rolling elements, or both transmission members may have rolling elements. It is preferable that at least one of the two transmission members has a rolling element so that the second transmission member is in rolling contact.
The lifting device is not limited to a truck crane as long as it lifts the excavating motor. For example, a crawler crane, a three-point pile driver, a backhoe or the like may be used as the lifting device.

DESCRIPTION OF SYMBOLS 1 ... Extraction device, 2 ... Elevating device, 7 ... Excavation motor, 11 ... Casing, 14 ... Excavation member, 21 ... Support member, 30 ... Hydraulic cylinder (actuator), 30b ... Piston rod (actuation part), 31 ... No. 1 transmission member, 31f ', 31f "... rolling element, 32 ... 2nd transmission member, 40 ... connection mechanism, P ... underground buried object

Claims (2)

A cylindrical casing connected to the rotor side of the excavating motor that is lifted and lowered by the lifting device so as to be rotated by the motor and to be lifted and lowered along with the motor;
A drilling member attached to the casing so that the surrounding area of the underground object can be excavated by rotating the casing by the motor;
It is attached to the casing so as to be displaceable so that it can be displaced between a retracted position that does not interfere with the embedded object in the casing and a support position that supports the embedded object inward of the casing than the retracted position. A support member;
An actuator for displacing the support member relative to the casing;
In the underground buried object extraction apparatus for extracting the buried object supported by the support member disposed at the support position from the ground by pulling up the casing after the excavation,
The actuator is attached to the stator side of the motor,
A first transmission member connected to the actuating part so as to be displaced in the rotation axis direction of the casing by the movement of the actuating part of the actuator;
A second transmission member attached to the casing so as to be displaceable in the rotation axis direction and to be able to rotate along the rotation axis;
A connection mechanism for connecting the second transmission member and the support member so that the support member can be displaced between the retracted position and the support position with displacement of the second transmission member relative to the casing; ,
The first transmission member and the second transmission member are arranged to face each other so as to be able to move together in the direction of the rotation axis and be pressed against each other so as to be relatively rotatable around the rotation axis .
The first transmission member has a first pressing portion;
The first pressing portion has a first surface and a second surface arranged with an interval in the rotation axis direction,
The second transmission member has a second pressing portion and a restriction portion;
The second pressing portion has a first surface facing the first surface of the first pressing portion and a second surface facing the second surface of the first pressing portion,
A first surface and a second surface are formed on the casing at an interval in the rotation axis direction,
The restricting portion is disposed between the first surface and the second surface of the casing;
The interval in the rotation axis direction between the first surface and the second surface of the casing is such that the second transmission member can be displaced by a certain distance in the rotation axis direction with respect to the casing. , Larger than the size of the restricting portion in the rotation axis direction,
Due to the displacement of the first transmission member in one direction of the rotation axis, the first surface of the first pressing portion is pressed against the first surface of the second pressing portion, and the restriction portion is By pressing against the first surface, displacement of the support member from the retracted position is restricted,
Due to the displacement of the first transmission member in the other direction of the rotation axis, the second surface of the first pressing portion is pressed against the second surface of the second pressing portion, and the restriction portion is By pressing against the second surface, displacement of the support member from the support position is restricted,
The distance in the rotation axis direction between the first surface and the second surface of the first pressing portion is the rotation axis direction between the first surface and the second surface of the second pressing portion. The space | interval of the said rotating shaft direction is provided between the said 1st pressing part and the said 2nd pressing part by making it different from this distance, The underground buried object extraction apparatus characterized by the above-mentioned . The underground buried object extraction device according to claim 1, wherein at least one of the two transmission members includes a rolling element so that the first transmission member and the second transmission member are in rolling contact with each other.

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