JP3616634B1 - Drawing device - Google Patents

Abstract

An object of the present invention is to provide a drawing device capable of reliably pulling out an embedded object from the ground with a simple structure.
An excavating blade in a peripheral region of a buried object is provided on the distal end side of a cylindrical body. The support body 21 attached to the cylindrical body 11 so as to be capable of relative swinging is positioned at the retreat position when the cylindrical body 11 enters the ground so as to surround the embedded object while rotating in one direction. When 11 is pulled up from the ground while rotating in the other direction, it is displaced from the retracted position toward the inside of the cylindrical body 11 by earth pressure. By pulling up the cylindrical body 11, the embedded object supported by the support body 21 is pulled out from the ground. The support 21 is provided with a receiving portion 24 for earth pressure. The arrangement of the receiving portion 24 with respect to the center of swinging of the support 21 is determined so that a moment for displacing the support 21 toward the inside of the cylindrical body 11 is generated when the cylindrical body 11 is pulled up from the ground.
[Selection] Figure 4

Description

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

  A drawing device is known which includes a cylindrical body called a casing and a support body swingably attached to the cylindrical body, and is provided with an excavating blade in the peripheral region of an existing pile on the tip side of the cylindrical body. (See Patent Document 1). The base end side of the cylindrical body is connected to a drive source such as a motor attached to the tip of the crane boom. The cylindrical body rotated by the drive source enters the ground so as to surround the existing pile while rotating in one direction. As a result, the surrounding area of the existing pile is excavated, and the existing pile can be pulled out.

  The support body is located at a retracted position where it does not interfere with the pile when it enters the ground so that it surrounds the pile, and when the tubular body is pulled up from the ground, Displace towards the direction. Thereby, when pulling up a cylindrical body, a pile can be pulled out from underground with a cylindrical body by supporting a pile via a support body.

Conventionally, in order to displace the support toward the inside of the cylindrical body when the cylindrical body is pulled up, hydraulic pressure or earth pressure is applied to the support.
Japanese Patent Publication No. 3-57247

  When the support is displaced toward the inside of the cylindrical body by applying hydraulic pressure, a hydraulic cylinder, a hydraulic pump, hydraulic piping, and the like are required, resulting in high costs.

When the support body is displaced toward the inside of the cylindrical body by applying earth pressure, the cost can be reduced as compared with the case where hydraulic pressure is applied. However, in the above-described prior art, there is no disclosure of a specific configuration for displacing the support toward the inside of the cylindrical body by earth pressure, and the rectangular plate-shaped support is used as the axis of the cylindrical body. It is merely attached to the cylindrical body so as to be swingable around the parallel axis. With such a structure, the support cannot be reliably displaced toward the inside of the cylindrical body.
An object of this invention is to provide the drawing apparatus which can solve the said subject.

The drawing device of the present invention includes a cylindrical body and a support body attached to the cylindrical body. Digging edge of the surrounding area of the underground buried object is provided on-edge of the tubular body. The cylindrical body is rotated by a drive source. The support is, when the tubular member enters into the ground so as to surround the buried object while rotating in one direction is positioned at the retracted position, the raising of the tubular body is supported by said support The buried object is pulled out from the ground.

One feature of the present invention, the support is mounted for relative displacement in the tubular body, the tubular body is rotated driven by the base end side is connected to a drive source, the tubular member Is rotated in the other direction by the earth pressure from the retracted position toward the inside of the cylindrical body, and the cylindrical body has a distal end side that is rotatable relative to the proximal end side, and the cylindrical body is A rotation restricting mechanism for restricting relative rotation of the distal end side to the proximal end side within a certain range is provided, and the support is attached to one of the distal end side and the proximal end side of the cylindrical body so as to be relatively displaceable. In addition, the other of the distal end side and the proximal end side of the cylindrical body is provided with a rotation direction pressing portion of the support body, and relative to the proximal end side of the distal end side when rotating in the other direction of the cylindrical body. By rotation, the support body is formed into the cylindrical shape by the rotation direction pressing portion. Lies in the is pressed into toward displaced inwardly.
As a result, when the excavation is performed by rotating the base end side of the cylindrical body in one direction by the drive source, the tip end side rotates relative to the base end side when rotating from the state of rotating in the other direction. The support pressed by the direction pressing portion is displaced toward the inside of the cylindrical body. At this time, since the distal end side of the cylindrical body bites into the ground via the excavating blade, it reliably rotates relative to the proximal end side. Therefore, the support body can be reliably displaced toward the inside of the cylindrical body, and the embedded object supported by the support body can be pulled out from the ground.

Another feature of the present invention is that the support is attached to the tubular body so as to be relatively displaceable, and when the tubular body is pulled up from the ground, the tubular body is removed from the retracted position by earth pressure. Displaced toward the inside of the body, the cylindrical body has a distal end side that can move relative to the proximal end in the axial direction, and restricts relative movement of the tubular body relative to the proximal end on the distal end side within a certain range. A movement restricting mechanism is provided, and the support is attached to one of the distal end side and the proximal end side of the cylindrical body so as to be relatively displaceable, and the support body is disposed between the distal end side and the proximal end side of the cylindrical body. On the other hand, an axial pressing portion of the support is provided, and the support is moved by the axial pressing portion by relative movement with respect to the proximal side of the distal end side when the cylindrical body is pulled up from the proximal end side. Push to displace toward the inside of the cylindrical body There is a point to be kicked.
As a result, when shifting from the state in which the tubular body enters the ground to perform excavation to the state in which the tubular body is pulled up, the distal end side moves in the axial direction relative to the proximal end side, and the axial direction pressing is performed. The support pressed by the portion is displaced toward the inside of the cylindrical body. At the time of pulling up the proximal end side of the cylindrical body, the frictional force between gravity and the surrounding region acts on the distal end side, so that the distal end side reliably moves relative to the proximal end in the axial direction. Therefore, the support body can be reliably displaced toward the inside of the cylindrical body, and the embedded object supported by the support body can be pulled out from the ground.
In this case, it is preferable that the distal end side of the cylindrical body has an overhang portion that projects outward from the outer periphery of the proximal end side. As a result, earth pressure acts on the protruding portion on the distal end side when the cylindrical body is pulled up, and the distal end side moves relative to the proximal end side in the axial direction with respect to the proximal end side more reliably.

  In the drawing device of the present invention, the proximal end side of the cylindrical body is composed of a plurality of divided portions that can move in the axial direction, and a movement restricting mechanism that restricts the relative movement of the adjacent divided portions to a certain range is provided. The support is attached to one of the adjacent divided portions so as to be relatively displaceable, and the other of the adjacent divided portions is provided with an axial pressing portion of the support, It is preferable that the support is pressed so as to be displaced inward of the cylindrical body by the axial pressing portion by relative movement of the adjacent divided portions at the time of pulling up. Accordingly, the embedded object can be supported by the support at a plurality of positions separated in the axial direction of the cylindrical body, and the embedded object can be more reliably supported.

  According to the drawing device of the present invention, an embedded object can be reliably pulled out from the ground with a simple structure.

A pulling device 1 of a first comparative example shown in FIG. 1 is attached to a travelable base machine exemplified by a truck crane 2 and is used for pulling an existing pile P as an underground buried object. The truck crane 2 includes a boom 5 attached to a swivel base 4 attached to a vehicle body 3 so as to be capable of rotational driving about the center of a vertical axis, and attached so as to be swingable around a horizontal axis so that the tip moves up and down. The wire 6 can be sent out and wound by a winch (not shown). A hook 9 for hanging a pile or the like is attached to the tip of the wire 6. A motor 7 is attached to the boom 5 as a drive source, and a reader 8 for guiding the motor 7 is attached to the boom 5. The motor 7 may be directly connected to the boom 5. Further, an excavation auger or the like may be attached to the motor 7 instead of the drawing device 1.

  The drawing device 1 includes a cylindrical body 11 constituting a cylindrical casing, and an excavating blade 12 in the area around the existing pile P is provided on the distal end side of the cylindrical body 11. As shown in FIG. 2, a connector 13 having a connecting shaft 13a concentric with the cylindrical body 11 is attached to the proximal end of the cylindrical body 11, and the cylindrical body 11 is connected to the output of the motor 7 via the connecting shaft 13a. Connected to the shaft. Thereby, the cylindrical body 11 is rotationally driven around the axis by connecting the base end side to the drive source. In addition, the surrounding area of the existing pile P can be weakened by supplying water or the like to the vicinity of the tip of the cylindrical body 11 by the pipe 14 connected to the flow path passing through the axis of the connecting shaft 13a. But this is not essential.

As shown in FIG. 3, the cylindrical body 11 has a large-diameter portion having a larger outer diameter on the distal end side than the proximal end side, a first tubular member 11 a constituting the large-diameter portion, and a base portion larger than the large-diameter portion. It has the 2nd cylindrical member 11b which comprises an end side part. As a result, the distal end side of the cylindrical body 11 has an overhanging portion 11 ′ projecting outward from the outer periphery of the proximal end side. In this comparative example , the first cylindrical member 11a and the second cylindrical member 11b are integrated by welding. A plurality of excavation blades 12 are attached to the tip of the first cylindrical member 11a, and a spiral blade 11d is provided on the outer periphery of the second cylindrical member 11b. Thereby, the cylindrical body 11 is driven to rotate by the motor 7 and enters the ground so as to surround the existing pile P while rotating in one direction, and is also driven to rotate in the reverse direction by the motor 7. Pulled up from the ground while rotating in the other direction.

  As shown in FIG. 4, a plurality of supports 21 are attached to the cylindrical body 11 so as to be capable of relative displacement with a circumferential interval. That is, each support body 21 is a plate shape in which the axial direction of the cylindrical body 11 is the thickness direction, and the first direction is the front side in the rotational direction of the cylindrical body 11 during excavation (the direction of arrow A in FIG. 4). It is attached to a bracket 22 attached to the inner periphery of the cylindrical member 11a through a support shaft 23 so as to be swingable. An opening 11 a ′ is formed in the first cylindrical member 11 a so as not to interfere with each support body 21. At the time of excavation, the tip of each support body 21 is arranged behind the swing center 23o in the rotation direction of the cylindrical body 11. In addition, each support body 21 may be attached to the second cylindrical member 11b, and a plurality of support bodies 21 may be attached at intervals in the vertical direction of the cylindrical body 11 at intervals in the circumferential direction. Good.

Each support 21 is provided with a receiving portion 24 for earth pressure. In this comparative example , the front end surface of each support 21 is a receiving portion 24. When the cylindrical body 11 is rotated in the other direction, a moment indicated by an arrow M1 in the figure that displaces each support body 21 toward the inside of the cylindrical body 11 is generated with respect to the swing center 23o of the support body 21. The arrangement of the receiving portion 24 is determined. That is, when rotating in the other direction of the cylindrical body 11, the receiving portion 24 is positioned forward of the rotational direction of the cylindrical body 11 (in the direction of arrow B in FIG. 4) with respect to the swing center 23 o of the support body 21. Earth pressure is received from the direction opposite to the direction of rotation (the direction of arrow A in FIG. 4). The area of the surface that receives the earth pressure in each receiving portion 24 is larger in the inside of a circle whose radius is the distance between the rotation center 11o of the cylindrical body 11 and the swing center 23o of the support body 21 than in the outside. In addition, a moment indicated by an arrow M1 in the figure is generated by earth pressure acting on the support body 21 including the receiving portion 24 when the cylindrical body 11 rotates in the other direction.

When the earth pressure in the direction opposite to the direction of rotation of the cylindrical body 11 in one direction (in the direction of arrow B in FIG. 4) acts on the support body 21, each support body 21 is installed in the existing pile by the moment indicated by the arrow M2 in the figure. It is located at a retracted position that does not interfere with P. At this time, the cylindrical body 11 is provided with a stopper (not shown) that prevents the support body 21 from being displaced so as to protrude outward from the cylindrical body 11. When the cylindrical body 11 is rotationally driven in the other direction, the earth pressure in the direction opposite to the rotational direction of the cylindrical body 11 (in the direction of arrow A in FIG. 4) acts on the receiving portion 24, so that the moment M 1 4, each support body 21 is displaced from the retracted position toward the inside of the cylindrical body 11 as indicated by a one-dot chain line. At this time, the cylindrical body 11 is provided with a stopper (not shown) that restricts the support body 21 from excessively swinging. In this comparative example , the surface that receives the earth pressure in each receiving portion 24 is parallel to the axial direction of the cylindrical body 11 and is radially outward as it goes forward in the rotational direction of the cylindrical body 11 during excavation. The axial direction of the center of the support shaft 23 that is inclined so as to become the swing center 23 o of each support 21 is parallel to the axial direction of the cylindrical body 11. In addition, the direction of the axis | shaft used as the rocking | swiveling center 23o of the support body 21 is not specifically limited, You may incline with respect to the axial direction of the cylindrical body 11, and the surface which receives earth pressure in each receiving part 24 Is not parallel to the axial direction of the cylindrical body 11, the direction of the axis serving as the swing center 23 o of the support 21 may be parallel to the radial direction of the cylindrical body 11.

  According to the above-described drawing device 1, when the cylindrical body 11 enters the ground so as to surround the existing pile P while rotating in one direction, each support body 21 is located at the retracted position. And the cylindrical body 11 rotates to another direction (arrow B direction in FIG. 4), and each support body 21 is displaced toward the inner side of the cylindrical body 11 by earth pressure. Therefore, excavation is performed until each support body 21 is located below the existing pile P, and then the cylindrical body 11 is rotated in the other direction to displace each support body 21 inward of the cylindrical body 11. After that, by pulling up the cylindrical body 11, the existing pile P supported by the support body 21 can be pulled out from the ground. When each support body 21 is positioned below the existing pile P when the cylindrical body 11 is pulled up, if the cylindrical body 11 is rotationally driven in the other direction and the support body 21 is disposed below the existing pile P, When pulling up the cylindrical body 11, it is not always necessary to rotate the cylindrical body 11 in the other direction. In addition, it is not necessary to position each support body 21 below the existing pile P at the time of pulling up the cylindrical body 11, and may be positioned on the side of the existing pile P. In this case, the support body 21 is the existing pile P. Therefore, when the tubular body 11 is pulled up, it is preferable to rotate the tubular body 11 in the other direction.

  According to the drawing device 1, the support body 21 can be reliably displaced toward the inside of the cylindrical body 11 by earth pressure, and the existing pile P supported by the support body 21 can be pulled out from the ground.

5A and 5B show a drawing device 1 of a second comparative example . The difference from the first comparative example is that at the time of excavation, the tip of each support body 21 is arranged in front of the swing center 23o in the rotation direction of the cylindrical body 11. Each receiving portion 24 is located on the base end side of the support body 21, and the surface receiving the earth pressure projects from the support body 21 in the thickness direction, is parallel to the axial direction of the cylindrical body 11, and is Is inclined so as to go radially inward as it goes forward in the rotational direction of the cylindrical body 11. The area of the surface 24a that receives the earth pressure in each receiving portion 24 is larger in the outer side of the circle whose radius is the distance between the rotation center 11o of the cylindrical body 11 and the swing center 23o of the support body 21 than in the inner side. It is assumed that a moment indicated by an arrow M1 in the figure is generated by the earth pressure acting on the support body 21 including the receiving portion 24 when the cylinder body 11 is rotated in the other direction. Others are the same as those of the first comparative example, and the same parts are denoted by the same reference numerals. Thereby, each support body 21 is displaced to the retracted position during excavation, and is displaced toward the inside of the tubular body 11 when rotating in the other direction of the tubular body 11.

FIG. 6 shows the drawing device 1 of the third comparative example , the right half shows the state when the cylindrical body 11 is pulled up, and the left half shows the state during excavation. The difference from the first comparative example is that each support body 21 has a tubular body 11 attached to a bracket 22 attached to the outer periphery of the second tubular member 11b, with the radial direction of the tubular body 11 being the thickness direction. An end portion located on the outer side of 11 is swingably attached via a support shaft 23. An opening 11b 'is formed in the second cylindrical member 11b so as not to interfere with each support body 21. The axial direction of the center of the support shaft 23 serving as the swing center 23 o of each support 21 is parallel to the radial direction of the cylindrical body 11. At the time of excavation, the distal end of each support body 21 is disposed closer to the proximal end side of the cylindrical body 11 than the swing center 23o. In addition, each support body 21 may be attached to the first cylindrical member 11a, and a plurality of support bodies 21 may be attached at intervals in the vertical direction of the cylindrical body 11 at intervals in the circumferential direction. Good.

  In each support body 21, the end face on the base end side of the cylindrical body 11 is a receiving portion 24 for earth pressure. When the cylindrical body 11 is pulled up from the ground, a moment indicated by an arrow M3 in the figure that displaces each support body 21 toward the inside of the cylindrical body 11 is generated with respect to the swing center 23o of the support body 21. The arrangement of the receiving portion 24 is determined. That is, when the cylindrical body 11 is pulled up from the ground, the receiving portion 24 is positioned inward of the cylindrical body 11 with respect to the swing center 23o of the support body 21, and its lifting direction (arrow in FIG. 6). The earth pressure is received from the direction opposite to the (C direction) (arrow D direction in FIG. 6). The area of the surface that receives the earth pressure in each receiving portion 24 is larger in the inner side of the cylindrical body 11 than in the outer side than the swing center 23 o of the support body 21.

When the earth pressure in the direction opposite to the underground approach direction of the cylindrical body 11 (the direction of arrow C in FIG. 6) acts on the support body 21 during excavation, each support body 21 is installed in the existing pile by the moment indicated by the arrow M4 in the figure. It is located at a retracted position that does not interfere with P. At this time, the support 21 is prevented from being displaced so as to protrude outward from the cylindrical body 11 by the edge of the opening 11b ′ functioning as a stopper. Due to the moment indicated by the arrow M3 in the drawing acting on the drawing, the support 21 is displaced from the retracted position toward the inside of the cylindrical body 11 as indicated by a one-dot chain line in FIG. At this time, excessive swinging of the support 21 is prevented by the inner peripheral surface of the opening 11b ′ functioning as a stopper. In this comparative example , the surface that receives the earth pressure in each receiving portion 24 is parallel to the radial direction of the cylindrical body 11 and is radially inward as it goes toward the proximal end side of the cylindrical body 11 during excavation. Tilt to head towards. It should be noted that the axial direction of the support shaft 23 serving as the swing center of the support 21 may be inclined with respect to the radial direction of the cylindrical body 11, and the surface receiving the earth pressure at each receiving portion 24 is a cylinder. As long as it is not parallel to the radial direction of the cylindrical body 11, the direction of the axis serving as the swing center of the support 21 may be parallel to the axial direction of the cylindrical body 11.
Others are the same as those of the first comparative example, and the same parts are denoted by the same reference numerals.

FIG. 7 shows the drawing device 1 of the fourth comparative example , the left half shows the state when the tubular body 11 is pulled up, and the right half shows the state during excavation. The difference from the third comparative example is that at the time of excavation, the distal end of each support body 21 is arranged closer to the distal end side of the cylindrical body 11 than the swing center 23o. The arrangement of the receiving portion 24 with respect to the swing center 23o of the support 21 is indicated by an arrow M5 in the figure that displaces each support 21 toward the inside of the cylindrical body 11 when the cylindrical body 11 is pulled up from the ground. It is determined that a moment is generated. That is, each receiving portion 24 is positioned along the outer periphery of the support shaft 23 of the support 21, and the surface receiving the earth pressure is parallel to the radial direction of the cylindrical body 11, and the thickness direction from the support 21 Overhang. The bracket 22 is formed with an insertion hole for the receiving portion 24 so as not to interfere with the receiving portion 24. The area of the surface 24 a that receives the earth pressure in each receiving portion 24 is larger than the rocking center 23 o of the support body 21 on the outer side of the cylindrical body 11 than on the inner side. During excavation, the earth pressure in the direction opposite to the underground approach direction of the cylindrical body 11 (in the direction of arrow C in FIG. 7) acts on the support body 21, so that each support body 21 is provided with an existing pile by the moment indicated by the arrow M6 in the figure. It is located at a retracted position that does not interfere with P. At this time, the support 21 is prevented from being displaced so as to protrude outward from the cylindrical body 11 by the edge of the opening 11b ′ functioning as a stopper. The support 21 is displaced from the retracted position toward the inside of the cylindrical body 11 as shown by a one-dot chain line in FIG. At this time, excessive swinging of the support 21 is prevented by the inner peripheral surface of the opening 11b ′ functioning as a stopper. Others are the same as the third comparative example, and the same parts are denoted by the same reference numerals.

8 and 9 show the drawing device according to the first embodiment of the present invention. The difference from the first comparative example is that the first cylindrical member 11a that constitutes the large-diameter portion on the distal end side of the cylindrical body 11 and the second cylindrical shape that constitutes the base-end side portion from the large-diameter portion. The member 11b is connected to the center of the rotation axis of the cylindrical body 11 so as to be relatively rotatable. That is, the second cylindrical member 11b is inserted into the first cylindrical member 11a so as to be relatively rotatable about the rotational axis thereof, whereby the cylindrical body 11 is rotated relative to the rotational axis center of the distal end side with respect to the proximal end side. It is possible. A rotation restricting mechanism that restricts relative rotation of the tubular body 11 with respect to the proximal end on the distal end side within a certain range is provided. That is, the first cylindrical member 11 a is provided with a plurality of long holes 31 whose circumferential direction is the long diameter direction, and the second cylindrical member 11 b is provided with a plurality of protruding portions 32 protruding to the outer periphery. Each protrusion 32 is inserted so as to be movable in the major axis direction, and the relative rotation is restricted to a certain range by the contact between the inner periphery of the long hole 31 and the protrusion 32, and the relative movement in the axial direction is restricted. .

Each support body 21 of the present embodiment has an inner periphery of the second cylindrical member 11b on the proximal end side of the cylindrical body 11 on the rear side in the rotational direction of the cylindrical body 11 during excavation (the direction of arrow A in FIG. 8). The bracket 22 is attached to the bracket 22 via the support shaft 23 so as to be capable of relative swinging, thereby being capable of relative displacement with respect to the cylindrical body 11. Each support 21 is provided with a pressed portion 21 ′ so as to protrude outward from the second cylindrical member 11 b from the end on the rear side in the rotational direction of the cylindrical body 11 during excavation. Each pressed portion 21 ′ is inserted into each of a plurality of openings 42 formed in the first tubular member 11 a. An inner periphery of each opening 42 is a rotation direction pressing portion 42 a provided on the distal end side of the cylindrical body 11. At the time of excavation, the tip of each support body 21 is disposed in front of the swing center 23o in the rotation direction of the cylindrical body 11. The axial direction of the support shaft 23 serving as the center of swing of the support 21 may be inclined with respect to the axial direction of the cylindrical body 11. Note that the receiving portion 24 as in the first comparative example is not provided on the support 21. Others are the same as those of the first comparative example, and the same portions are denoted by the same reference numerals.

  Thereby, when the cylindrical body 11 rotates in one direction at the time of excavation, each support body 21 is rotated in the direction opposite to the rotation direction by the rotation direction pressing portion 42a via the pressed portion 21 '(the direction of arrow B in FIG. 8). As shown by a solid line in FIG. 8, each support body 21 is positioned at a retracted position that does not interfere with the existing pile P. When the cylindrical body 11 rotates in the other direction and the distal end side of the cylindrical body 11 rotates relative to the proximal end side, each support body 21 is rotated by the rotational direction pressing portion 42a via the pressed portion 21 '. It is pressed in the direction opposite to the direction (the direction of arrow A in FIG. 8), and is displaced toward the inside of the cylindrical body 11 as shown by the one-dot chain line in FIG.

According to the drawing device 1 of the first embodiment, when the excavation is performed by rotating the base end side of the cylindrical body 11 in one direction by the motor 7, the base end side is shifted to the state of rotating in the other direction. The support body 21 pressed relative to the distal end side relative to the rotation direction pressing portion 42 a is displaced inward of the cylindrical body 11. At this time, since the distal end side of the cylindrical body 11 bites into the ground via the excavating blade 12, it reliably rotates relative to the proximal end side. Therefore, the support body 21 can be reliably displaced toward the inside of the cylindrical body 11, and the existing pile P supported by the support body 21 can be pulled out from the ground.

10 and 11 show a second embodiment. The difference from the first embodiment is that the first cylindrical member 11a is inserted into the second cylindrical member 11b so as to be relatively rotatable about the rotational axis center of the cylindrical body 11, and the elongated hole 31 is formed in the second cylindrical member 11b. Protruding portions 32 are provided on the first cylindrical member 11a, each support 21 is attached to the first cylindrical member 11a, and a rotation direction pressing portion 42a is provided on the second cylindrical member 11b. Each support body 21 is attached to the 1st cylindrical member 11a in the rotation direction front side of the cylindrical body 11 at the time of excavation. Each support body 21 is provided with a pressed portion 21 ′ at the end portion on the front side in the rotational direction of the cylindrical body 11 during excavation. At the time of excavation, the tip of each support body 21 is arranged behind the swing center 23o in the rotation direction of the cylindrical body 11. Others are the same as in the first embodiment, and the same parts are denoted by the same reference numerals. Thereby, when the cylindrical body 11 rotates in one direction during excavation, each support body 21 is pressed in the rotation direction (arrow A direction in FIG. 10) by the rotation direction pressing portion 42a via the pressed portion 21 ′. As shown by a solid line in FIG. 10, each support body 21 is positioned at a retracted position that does not interfere with the existing pile P. When the cylindrical body 11 is rotated in the other direction from the state where excavation is performed, each support body 21 is interposed via the pressed portion 21 ′ because the distal end side of the cylindrical body 11 rotates relative to the proximal end side. It is pressed in the rotation direction (in the direction of arrow B in FIG. 10) by the rotation direction pressing portion 42a, and is displaced toward the inside of the cylindrical body 11 as shown by a one-dot chain line in FIG.

12 and 13 show a drawing device according to a third embodiment of the present invention, in which the right half shows a state when the tubular body 11 is pulled up and the left half shows a state during excavation. The difference from the first comparative example is that the first cylindrical member 11a that constitutes the large-diameter portion on the distal end side of the cylindrical body 11 and the second cylindrical shape that constitutes the base-end side portion from the large-diameter portion. The member 11b is connected so as to be relatively movable in the axial direction of the cylindrical body 11. In other words, the first cylindrical member 11a is inserted into the second cylindrical member 11b so as to be relatively movable in the direction of the rotation axis, whereby the cylindrical body 11 is relatively moved in the direction of the rotation axis with respect to the proximal end side. It is possible. A movement restricting mechanism is provided that restricts relative movement of the distal end side of the cylindrical body 11 to the base end side within a certain range. That is, the second cylindrical member 11b is provided with a plurality of long holes 51 whose axial direction is the major axis direction, and the first cylindrical member 11a is provided with a plurality of projecting portions 52 protruding to the outer periphery. Each protrusion 52 is inserted so as to be movable in the major axis direction, and the relative movement is restricted to a certain range by the contact between the inner periphery of the long hole 51 and the protrusion 52, and the relative rotation is also restricted.

Each support body 21 of the present embodiment has a bracket 62 attached to the outer periphery of the second cylindrical member 11 b on the proximal end side of the cylindrical body 11 on the distal end side of the cylindrical body 11 via the support shaft 23. It is attached so as to be capable of relative displacement, and is thereby capable of relative displacement with respect to the cylindrical body 11. In the present embodiment, the axial direction of the support shaft 23 serving as the swing center 23 o of each support 21 is parallel to the radial direction of the cylindrical body 11. In each support body 21, the radial direction of the cylindrical body 11 is the thickness direction, and each of the plurality of openings 53 formed in the first cylindrical member 11a and the plurality of openings 54 formed in the second cylindrical member 11b. It is inserted in each. The inner periphery of each opening 53 in the first tubular member 11 a is an axial pressing portion 53 a provided on the distal end side of the tubular body 11. At the time of excavation, the distal end of each support body 21 is disposed closer to the proximal end side of the cylindrical body 11 than the swing center 23o. Note that the receiving portion 24 as in the first comparative example is not provided on the support 21. Others are the same as those of the first comparative example, and the same portions are denoted by the same reference numerals.

  Thereby, when the cylindrical body 11 enters the ground during excavation, each support body 21 is pressed in the direction opposite to the approach direction (in the direction of arrow E in FIG. 12) by the axial pressing portion 53a. Is located at a retracted position where it does not interfere with the existing pile P. When the distal end side of the cylindrical body 11 is moved relative to the proximal end side when pulled up from the proximal end side, each support body 21 is moved in the direction opposite to the lifting direction by the axial pressing portion 53a (in the direction of arrow F in FIG. 12). And is displaced toward the inside of the cylindrical body 11 as indicated by a one-dot chain line in FIG.

According to the drawing device 1 of the third embodiment, when the state in which excavation is performed by causing the cylindrical body 11 to enter the ground, the transition from the state in which the cylindrical body 11 is lifted to the distal end side with respect to the proximal end side is performed. The side is relatively moved in the axial direction, and the support body 21 pressed by the axial direction pressing portion 53 a is displaced toward the inside of the cylindrical body 11. Since the friction force between gravity and the surrounding area acts on the distal end side when the proximal end is pulled up, the distal end side reliably moves in the axial direction relative to the proximal end side. Therefore, the support body 21 can be reliably displaced toward the inside of the cylindrical body 11, and the existing pile P supported by the support body 21 can be pulled out from the ground. Furthermore, since the distal end side of the tubular body 11 has an overhanging portion 11 ′ that projects outward from the outer periphery of the proximal end side, earth pressure is applied to the overhanging portion 11 ′ on the distal end side when the tubular body 11 is pulled up. The distal end side moves relative to the proximal end side in the axial direction more reliably with respect to the proximal end side.

FIG. 14 shows a fourth embodiment, where the left half shows a state when the tubular body 11 is pulled up and the right half shows a state during excavation. The difference from the third embodiment is that the second cylindrical member 11b is inserted into the first cylindrical member 11a so as to be relatively movable in the rotational axis direction of the cylindrical body 11, and the third cylindrical member 11a is inserted into the first cylindrical member 11a. A long hole similar to the long hole 51 is provided, a protrusion similar to the protrusion 52 of the third embodiment is provided on the second cylindrical member 11b, and each support 21 is attached to the first cylindrical member 11a. A direction pressing portion 53a is provided on the second cylindrical member 11b. Each support body 21 is attached to the first cylindrical member 11a on the proximal end side of the cylindrical body 11 during excavation, and during excavation, the distal end of each support body 21 is closer to the cylindrical body 11 than the swing center 23o. It is arranged on the tip side. Others are the same as in the third embodiment, and the same parts are denoted by the same reference numerals. Thereby, when the cylindrical body 11 enters the ground during excavation, each support body 21 is pressed in the approach direction (in the direction of arrow F in FIG. 14) by the axial pressing portion 53a, and each support body 21 is installed in the existing pile. It is located at a retracted position that does not interfere with P. When the distal end side of the cylindrical body 11 is moved relative to the proximal end side when being pulled up, each support body 21 is pressed in the lifting direction (in the direction of arrow E in FIG. 14) by the axial pressing portion 53a. As indicated by the chain line, the cylinder 11 is displaced inward.

15 and 16 show the drawing device of the fifth embodiment. The left half of FIG. 15 shows a state when the tubular body 11 is pulled up, and the right half shows a state when excavating. The difference from the third embodiment is that the second cylindrical member 11b, which is the proximal end side of the cylindrical body 11, is composed of a first divided portion 11b ′ and a second divided portion 11b ″ that are relatively movable in the axial direction. The connection structure between the first divided portion 11b ′ and the first cylindrical member 11a is the same as the connection structure between the second cylindrical member 11b and the first cylindrical member 11a of the third embodiment, and the first Similarly to the third embodiment, the existing pile P can be supported by the support body 21. The first divided portion 11b 'is inserted into the second divided portion 11b "so as to be relatively movable in the direction of the rotation axis. Both the divided portions 11b 'and 11b "are adjacent to each other. A movement restricting mechanism for restricting the relative movement of the first divided portion 11b' and the second divided portion 11b" to a certain range is provided. That is, the second divided portion 11b ″ is provided with a plurality of long holes 71 whose axial direction is the major axis direction, and the first divided portion 11b ′ is provided with a plurality of protruding portions 72 protruding to the outer periphery. Each of the protrusions 72 is inserted so as to be movable in the major axis direction, and the relative movement is restricted to a certain range by the contact between the inner periphery of the long hole 71 and the protrusion 72, and the relative rotation is also restricted. A plurality of supports 21 are attached to the two divided portions 11b ″ by a structure similar to that of the third embodiment via a support shaft 23 so as to be relatively displaceable. Each of the supports 21 is formed on the first divided portion 11b ′. Each of the plurality of openings 73 and each of the plurality of openings 74 formed in the second divided portion 11b ″ are inserted. The inner periphery of each opening 73 in the first divided portion 11b ′ is the tip of the cylindrical body 11. Axial direction provided on the side . Other being a mounting portion 73a to the same parts the same as in the third embodiment are denoted by the same reference numerals.
Thereby, when the cylindrical body 11 enters the ground during excavation, each support body 21 is pressed in the direction opposite to the entering direction by the axial pressing portions 53a and 73a, and as shown in the right half of FIG. The support 21 is located at a retracted position that does not interfere with the existing pile P. When the tubular body 11 is pulled up, as shown by a two-dot chain line in FIG. 16, the distal end side of the tubular body 11 moves relative to the first divided portion 11b 'on the proximal end side, and the first divided portion 11b' By moving relative to the second divided portion 11b ″, each support 21 is pressed in the direction opposite to the pulling direction by the axial pressing portions 53a and 73a. As shown in the left half of FIG. Therefore, the existing pile P can be supported by the support body 21 at a plurality of positions separated in the axial direction of the cylindrical body 11, and the existing pile P can be more reliably supported. The support body 21 located on the distal end side of the existing pile P is located below the lower end of the existing pile P, and the tubular body 11 is pulled up after the support body 21 maintained on the proximal end side is located on the side of the existing pile P. So, lift the existing pile P from below It can be supported so as to be sandwiched by a frictional force from the side, and by pulling up the cylindrical body 11 after all the support bodies 21 are located on the side of the existing pile P, the existing pile P can be lifted from the side. You may support so that it may pinch | interpose with a frictional force.

17A, 17B, and 17C show a sixth embodiment. In the first embodiment, the axial direction of the support shaft 23 serving as the swing center 23o of the support body 21 is parallel to the axial direction of the cylindrical body 11, but this embodiment is the same as the third embodiment. Are parallel to the radial direction of the cylindrical body 11. In this case, the support 21 is swingably attached to the bracket 62 ′ fixed to the second cylindrical member 11 b via the support shaft 23. The support 21 is inserted through an opening 11b 'formed in the second cylindrical member 11b and an opening 42 formed in the first cylindrical member 11a. A pressed portion 21 ″ in which the end surfaces on the distal end side and the proximal end side of the tubular body 11 in the support body 21 are inclined so as to be directed from the distal end side toward the proximal end side from one circumferential direction of the tubular body 11 to the other; A rotation direction pressing portion 42a having an end face 42a ′ parallel to the pressed portion 21 ″ is provided on the inner periphery of each opening 42 in the first tubular member 11a. Thereby, when the cylindrical body 11 rotates in one direction at the time of excavation, the distal end side of the cylindrical body 11 rotates relative to the proximal end side, so that each support body 21 passes through the pressed portion 21 ′. The rotation direction pressing portion 42a is pressed in the direction opposite to the approach direction of the cylindrical body 11 (the direction of arrow E in FIG. 17A), and each support body 21 is positioned at a retracted position that does not interfere with the existing pile P. When the cylindrical body 11 rotates in the other direction and the distal end side of the cylindrical body 11 rotates relative to the proximal end side, each support body 21 pulls up the cylindrical body 11 via the pressed portion 21 ′. Is pushed in the opposite direction (in the direction of arrow F in FIG. 17A) and displaced toward the inside of the cylindrical body 11 as shown by the one-dot chain line in FIG. 17B. Others are the same as in the first embodiment. As a modification of the sixth embodiment, the support body 21 is pressed in the approach direction of the cylindrical body 11 during excavation and displaced to the retracted position, and the support body 21 of the cylindrical body 11 is lifted when the cylindrical body 11 is pulled up. The support body 21 may be displaced inward of the cylindrical body 11 by being pushed in the pulling direction, or the support body 21 is swingably attached to the first cylindrical member 11a, and the rotational direction pressing portion 42a is provided. You may provide in the 2nd cylindrical member 11b.

FIG. 18 shows a seventh embodiment. In the first embodiment, the support body 21 is attached to the second tubular member 11b so as to be relatively displaced by swinging, but in the present embodiment, the second tubular member 11b is provided with a guide hole 71 therebetween. The cylindrical body 11 is attached so as to be relatively displaceable in the radial direction. A pressed portion 21 ′ is provided so as to protrude radially outward from the support body 21. The pressed surface 21a in which the end faces on the one side and the other side of the cylindrical body 11 in the pressed portion 21 'are inclined so as to go from one circumferential direction to the other as the radial direction of the cylindrical body 11 moves from one to the other. It is said that. A rotation direction pressing portion 42a having an end surface 42a 'in contact with the pressed surface 21a' is provided on the inner periphery of the first tubular member 11a. Thereby, when the cylindrical body 11 rotates in one direction at the time of excavation, the distal end side of the cylindrical body 11 rotates relative to the proximal end side, so that each support body 21 passes through the pressed portion 21 ′. Pressed by the rotation direction pressing portion 42a, each support body 21 is positioned at a retracted position that does not interfere with the existing pile P. When the cylindrical body 11 rotates in the other direction and the distal end side of the cylindrical body 11 rotates relative to the base end side, each support body 21 is pressed through the pressed portion 21 ′, and is indicated by a one-dot chain line. In this way, the cylinder body 11 is displaced inward. Others are the same as in the first embodiment. As a modification of the seventh embodiment, the support 21 may be attached to the first tubular member 11a so as to be relatively displaceable in the radial direction, and the rotation direction pressing portion 42a may be provided on the second tubular member 11b.

19A and 19B show an eighth embodiment. In the third embodiment, the axial direction of the support shaft 23 serving as the swing center 23o of the support 21 is parallel to the radial direction of the cylindrical body 11, but in this embodiment, the same as in the first embodiment. Are parallel to the axial direction of the cylindrical body 11. In this case, the support 21 is swingably attached to the bracket 62 fixed to the first cylindrical member 11 a via the support shaft 23. A pressed portion 21 ′ is provided on the support body 21 so as to protrude outward from the first cylindrical member 11 a. The pressed portion 21 ′ is inserted into the opening 54 formed in the second cylindrical member 11 b. The pressed surface 21 in which the end surfaces on the one side and the other side of the cylindrical body 11 in the pressed portion 21 ′ are inclined so as to go from one circumferential direction to the other in the axial direction of the cylindrical body 11. An axial pressing portion 54a having an end surface 54a 'in contact with the pressed surface 21 "is provided on the inner periphery of the opening 54 in the second tubular member 11b. Thus, when the cylindrical body 11 enters the ground during excavation, each support body 21 is pressed in one direction of rotation (in the direction of arrow B in FIG. 19A) by the axial pressing portion 53a via the pressed portion 21 ′. As shown by the solid line, each support body 21 is positioned at a retracted position that does not interfere with the existing pile P. When the cylindrical body 11 is pulled up, the distal end side moves relative to the proximal end side, whereby each support body 21 is pressed in the other direction of rotation (in the direction of arrow A in FIG. 19A) by the axial pressing portion 53a. As indicated by the alternate long and short dash line, the cylinder 11 is displaced inward. Others are the same as in the third embodiment. As a modification of the seventh embodiment, the support body 21 is positioned in the retracted position by being pressed in the direction of arrow A in FIG. 19A during excavation, and inward of the cylindrical body 11 by being pressed in the direction of arrow B. It may be displaced in the opposite direction. Further, the support body 21 may be swingably attached to the second cylindrical member 11b, and the axial pressing portion 53a may be provided on the first cylindrical member 11a.

FIG. 20 shows a ninth embodiment. In the third embodiment, the support body 21 is attached to the second cylindrical member 11b so as to be relatively displaced by swinging. However, in this embodiment, the guide hole 71 is provided in the second cylindrical member 11b. The cylindrical body 11 is attached so as to be relatively displaceable in the radial direction. A pressed portion 21 ′ is provided so as to protrude radially outward from the support 21. The pressed surface 21a in which the end surfaces on one side and the other side of the cylindrical body 11 in the pressed portion 21 'are inclined so as to go from one axial direction to the other in the radial direction of the cylindrical body 11. It is said that. An axial pressing portion 53a having an end surface 53a ′ in contact with the pressed surface 21a ′ is provided on the inner periphery of the first cylindrical member 11a. Thereby, when the cylindrical body 11 enters the ground during excavation, each support body 21 is pressed in the direction opposite to the approach direction (in the direction of arrow E in FIG. 20) by the axial pressing portion 53a. Is located at a retracted position that does not interfere with the existing pile P. When the distal end side of the cylindrical body 11 is moved relative to the proximal end side when the tubular body 11 is pulled up from the proximal end side, each support body 21 is moved in the direction opposite to the lifting direction by the axial pressing portion 53a (the arrow F direction in FIG. 20). And is displaced toward the inside of the cylindrical body 11 as indicated by a one-dot chain line. As a modification of the ninth embodiment, the support 21 may be attached to the first cylindrical member 11a so as to be relatively displaceable in the radial direction, and the axial pressing portion 53a may be provided on the second cylindrical member 11b.

The present invention is not limited to the above embodiment. For example, the object to be extracted according to the present invention is not limited to the existing pile P as long as it is an underground object, and for example, an obstacle embedded in the ground may be extracted by the extraction device of the present invention. Moreover, you may make it the drawing apparatus of this invention have the structure of the said 2 or more embodiment together. Also, movement of the cylindrical body of the front end side and the case where the base end side of the relative rotational or relative movement by a support pressing the rotating direction pressing portion or the axial direction pressing portion, the link mechanism to move the relative rotational walking is relative You may make it transmit to a rotation direction pressing part or an axial direction pressing part via a conversion mechanism. Further, the axial length of the first cylindrical member 11a on the distal end side is made substantially the same as the axial length of the second cylindrical member 11b on the proximal end side, and the proximal end position of the first cylindrical member 11a The proximal end position of the tubular member 11b may be substantially matched in the axial direction of the tubular body 11.

The figure which shows the state which attached the drawing apparatus of the 1st comparative example of this invention to the truck crane. The figure which shows the base end side of the cylindrical body in the drawing apparatus of the 1st comparative example of this invention. The figure which shows the front end side of the cylindrical body in the drawing apparatus of the 1st comparative example of this invention. The cross-sectional view of the principal part of the cylindrical body in the drawing device of the first comparative example of the present invention The cross-sectional view of the principal part of the cylindrical body in the drawing device of the second comparative example of the present invention The side view of the support body in the drawing device of the 2nd comparative example of the present invention. The longitudinal cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of the 3rd comparative example of this invention The longitudinal cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of the 4th comparative example of this invention The cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 1st Embodiment of this invention The side view of the principal part of the cylindrical body in the drawing apparatus of 1st Embodiment of this invention. The cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 2nd Embodiment of this invention The side view of the principal part of the cylindrical body in the drawing apparatus of 2nd Embodiment of this invention. The longitudinal cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 3rd Embodiment of this invention The cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 3rd Embodiment of this invention The longitudinal cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 4th Embodiment of this invention The longitudinal cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 5th Embodiment of this invention The side view of the principal part of the cylindrical body in the drawing apparatus of 5th Embodiment of this invention. The longitudinal cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 6th Embodiment of this invention Sectional drawing of the principal part of the cylindrical body in the drawing apparatus of 6th Embodiment of this invention. The cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 6th Embodiment of this invention The cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 7th Embodiment of this invention The cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 8th Embodiment of this invention Sectional drawing of the principal part of the cylindrical body in the drawing apparatus of 8th Embodiment of this invention. The cross-sectional view of the principal part of the cylindrical body in the drawing apparatus of 9th Embodiment of this invention

Explanation of symbols

1 Pulling device 7 Motor (drive source)
11 cylindrical body 11 'overhang part 11a 1st cylindrical member (tip side)
11b Second cylindrical member (base end side)
11b '1st division part 11b "2nd division part 12 Excavation blade 21 Support body 23o Oscillation center 24 Receiving part 31 Long hole 32 Protrusion part 42a Rotational direction pressing part 51 Long hole 52 Protrusion part 53a, 73a Axial direction pressing part 61 Long hole 62 Projection

Claims (5)

A tubular body;
A support body attached to the cylindrical body so as to be relatively displaceable,
Excavation blade in the surrounding area of the underground object is provided at the tip of the cylindrical body,
The cylindrical body is rotationally driven by connecting the base end side to a drive source,
The support is positioned at a retreat position when the cylindrical body enters the ground so as to surround the embedded object while rotating in one direction, and earth pressure is applied when the cylindrical body rotates in the other direction. Is displaced from the retracted position toward the inside of the cylindrical body,
In the pulling-out apparatus in which the buried object supported by the support is pulled out from the ground by pulling up the cylindrical body,
The cylindrical body is rotatable relative to the proximal end on the distal end side,
A rotation restricting mechanism for restricting relative rotation of the tubular body relative to the proximal end on the distal end side within a certain range;
The support is attached to one of the distal end side and the proximal end side of the cylindrical body so as to be relatively displaceable,
The other of the distal end side and the proximal end side of the cylindrical body is provided with a rotation direction pressing portion of the support body,
When the cylindrical body is rotated in the other direction, the support body is pressed by the rotation direction pressing portion so as to be displaced inward of the cylindrical body by relative rotation with respect to the base end side of the distal end side. Feature drawing device. The drawing device according to claim 1, wherein a spiral blade is provided on a proximal end side of the cylindrical body . A tubular body;
A support body attached to the cylindrical body so as to be relatively displaceable,
Excavation blades in the surrounding area of underground objects are provided on the tip side of the cylindrical body,
The cylindrical body is rotationally driven by a drive source,
The support is positioned at a retreat position when the cylindrical body enters the ground so as to surround the buried object while rotating in one direction, and earth pressure is applied when the cylindrical body is pulled up from the ground. Is displaced from the retracted position toward the inside of the cylindrical body,
In the pulling-out apparatus in which the buried object supported by the support is pulled out from the ground by pulling up the cylindrical body,
The cylindrical body is movable relative to the proximal end side in the axial direction on the distal end side,
A movement restricting mechanism for restricting the relative movement of the tubular body relative to the proximal end on the distal end side within a certain range is provided;
The support is attached to one of the distal end side and the proximal end side of the cylindrical body so as to be relatively displaceable,
On the other of the distal end side and the proximal end side in the cylindrical body, an axial pressing portion of the support is provided,
By the relative movement of the distal end side with respect to the proximal end side when the tubular body is pulled up from the proximal end side, the support body is pressed by the axial pressing portion so as to be displaced inward of the cylindrical body. A drawing device. The extraction device according to claim 3, wherein a distal end side of the cylindrical body has an overhanging portion that projects outward from an outer periphery on the proximal end side . The proximal end side of the cylindrical body is composed of a plurality of divided parts that are axially movable relative to each other,
A movement restricting mechanism for restricting the relative movement of adjacent divided parts to a certain range is provided,
The support is attached to one of the adjacent divided parts so as to be relatively displaceable, and the other of the adjacent divided parts is provided with an axial pressing part of the support.
5. The support according to claim 3, wherein the support is pressed by the axial pressing portion so as to be displaced inward of the cylindrical body by relative movement of the adjacent divided portions when the cylindrical body is pulled up. Drawing device.

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