JP2010174446A - Plug for gripping pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug capable of preventing a nut member from being removed from a bolt. <P>SOLUTION: This plug is provided with the bolt 7, the nut member 8 being screw-fitted into the bolt 7 and having a tapered outer peripheral face whose diameter becomes smaller when approaching a rotary operation head part 6 of the bolt 7, a liner 9 fitted externally into the outer peripheral face of the nut member 8 and having an inner face part 13 whose diameter becomes larger when approaching a tip side of the bolt 7 and an outer face part coming into pressure-contact with an inner peripheral face of a tubular pile 1, and a top plate 10 provided between the rotary operation head part 6 and the liner 9 and mounted on the bolt 7. The liner 9 is divided into a plurality of sections in the peripheral direction to form divided liners 14, and a holding mechanism 11 for holding the divided liners 14 to move freely in the radial direction of the bolt 7 to a remote or near place by the predetermined distance is provided to extend and contract the outside diameter formed by all the divided liners 14 by travel of the nut member 8 in the direction of shaft axis of the bolt. A stopper 12 for preventing the nut member 8 from coming out through a tip part of the bolt 7 is attached to the bolt 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pile gripping plug for mounting in the upper end portion of a pipe pile when gripping the outer surface of the upper end portion of the pipe pile with a catcher for gripping the pipe pile.

Generally, when gripping a pipe pile, attach a plug in the upper end of the pipe pile so that the upper end of the pipe pile will not be deformed even if the catcher holds the outer surface of the upper end of the pipe pile strongly. There is a need.
Therefore, conventionally, as a plug, a bolt having a rotary operation head having a diameter larger than that of the male screw portion, and a taper shape having a smaller diameter toward the side closer to the rotation operation head and screwed to the bolt. A nut member provided with an outer peripheral surface, and an outer surface portion that is externally fitted to the outer peripheral surface of the nut member and has a larger diameter toward the tip end side of the bolt and an outer surface portion that can be pressed against the inner peripheral surface of the pipe pile A liner and a top plate to be attached to the bolt with both front and back end surfaces interposed between the rotation operation head and the liner are provided, and the liner is divided into a plurality in the circumferential direction. A clamping ring formed of an elastic material formed on the dividing liner and wound around the plurality of dividing liners and urging all the dividing liners in a diameter reducing direction; Move all before Outer diameter formed by the divided liner had been configured to be scaled (for example, see Patent Document 1).

Japanese Patent No. 3845604

In the above-described conventional plug, when mounting and fixing in the upper end portion of the pipe pile, by rotating the bolt to bring the nut member closer to the rotary operation head, all the split liners are removed. It is made to press contact with the pipe pile inner surface by expanding the diameter.
On the other hand, to reduce the diameter of all the divided liners and remove the plug from the upper end of the pipe pile, turn the bolt in the opposite direction to move the nut member away from the rotary operation head. The split liner tightened by the tightening ring is reduced in diameter.
However, when the above plug removal work is performed from the upper end of the pipe pile upright in the pipe pile standing work, the nut member is detached from the bolt lower end by turning the bolt too far in the reverse direction. In some cases, the nut member or the liner fitted on the nut member is dropped into the lower portion of the pipe pile buried in the ground.

  Accordingly, an object of the present invention is to provide a plug that eliminates the above-described problems and prevents the nut member from being detached from the bolt when the plug is removed.

  The first characteristic configuration of the present invention is a rotary operation head having a diameter larger than that of the male screw portion for mounting in the upper end portion of the pipe pile when holding the outer surface of the upper end portion of the pipe pile with a catcher for gripping the pipe pile. A bolt provided with a portion, a nut member screwed into the bolt and having a tapered outer peripheral surface with a smaller diameter toward the side closer to the rotation operation head, and an outer fit on the outer peripheral surface of the nut member And a liner having an inner surface portion that becomes larger in diameter toward the tip end side of the bolt and an outer surface portion that can be press-contacted to the inner peripheral surface of the pipe pile, and both front and back ends between the rotating operation head and the liner. A top plate to be attached to the bolt with a surface being freely contactable, the liner being divided into a plurality of portions in the circumferential direction and formed into a divided liner, the divided liner being a predetermined distance in the radial direction of the bolt Provide a holding mechanism to hold it movably The outer diameter formed by all the divided liners is configured to be expandable / contractable by movement of the nut member in the bolt axial direction, and a stopper that prevents the nut member from coming out from the tip of the bolt, It is in the place attached to the bolt.

According to the first characteristic configuration of the present invention, when mounting and fixing in the upper end portion of the pipe pile, by rotating the bolt and operating the nut member closer to the rotation operation head, By expanding the outer diameter of the divided liner, it is pressed against the inner surface of the pipe pile.
On the other hand, when the plug is removed from the upper end of the pipe pile, the bolt is turned in the opposite direction to move the nut member away from the rotary operation head and reduce the diameter of all the divided liners. At this time, even if the bolt is rotated too much in the reverse direction, the stopper prevents the nut member from coming off from the tip of the bolt and prevents the nut member from dropping into the pipe pile.

  According to a second characteristic configuration of the present invention, the holding mechanism is provided between at least one end of the split liner and the stopper, and at least one between the other end of the split liner and the top plate. There is to be.

  According to the second characteristic configuration of the present invention, the holding mechanism is provided between at least one end of the split liner and the stopper and at least one of the other end of the split liner and the top plate. Since each of the split liners is held, as in the conventional example, the fastening ring made of rubber wound around all the split liners is broken during the construction due to its deterioration, and the work is interrupted. Can be prevented.

  A third characteristic configuration of the present invention is that the liner is provided with a flange portion capable of contacting the end face of the pipe pile.

According to the 3rd characteristic structure of this invention, when removing the said plug from the state fixed to the upper end part inner surface of a pipe pile, the inner surface of a pipe pile, the outer surface of the said liner, the inner surface of the said liner, and the said A large frictional force is exerted on the outer surface of the nut member in pressure contact with each other.
In order to turn the bolt in the opposite direction and move the nut member away from the rotary operation head, the nut member must not rotate with the bolt, and further, press-contact with the nut member. The liner is not allowed to rotate relative to the pipe pile. For this reason, if the flange portion provided on the liner is attached in contact with the end face of the pipe pile, the end face of the pipe pile The frictional force between the flange portion prevents the liner from rotating relative to the pipe pile, and as a result, the nut member can reliably move forward and backward along the bolt axis.

  According to a fourth characteristic configuration of the present invention, the top plate and the split liner are engaged with the split liner by the holding mechanism so as to allow relative rotation around the bolt axis. is there.

According to the fourth characteristic configuration of the present invention, in the state where the plug is fixed to the upper end portion of the pipe pile, the catcher that holds the pipe pile is installed while rotating the pipe pile around its axis. In some cases, the driving rotational force to the pipe pile is transmitted to the top plate.
At that time, if the top plate does not rotate relative to the liner, it is possible to maintain the function of the plug for a long period by avoiding the risk of shearing and breaking the locking structure of the holding mechanism. Became.

  According to a fifth characteristic configuration of the present invention, the holding mechanism is provided between the division liner and the stopper, and a restriction mechanism that restricts each of the division liners to move in a direction normal to the bolt axis is provided. It exists in the holding mechanism.

According to the fifth characteristic configuration of the present invention, before the pipe pile standing work, the bolt shaft center is placed in the lateral direction in the end portion of the pipe pile that is laid down on the ground at the construction site. Attach the plug in the state.
At that time, the nut member is moved away from the rotation operation head of the bolt to reduce the diameter of the split liner, but each split liner is regulated by a regulating mechanism so as to move in the normal direction of the bolt axis. Therefore, each of the divided liners divided into a plurality can be easily brought together around the bolt, so that the mounting operation to the end portion of the pipe pile can be performed smoothly.

In the longitudinal cross-sectional view of this embodiment, (a) shows the diameter-reduced state of a division | segmentation liner, (b) shows the diameter-expansion state of a division | segmentation liner. In the side view of this embodiment, (a) shows the diameter-reduced state of a division | segmentation liner, (b) shows the diameter-expansion state of a division | segmentation liner. Exploded perspective view of this embodiment Exploded perspective view of liner and bottom plate of this embodiment Explanatory drawing showing construction status Vertical section of another embodiment

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 to 5, the present invention provides a plug 3 that is used for mounting in the upper end portion of the pipe pile 1 when the catcher 2 for holding the pipe pile grips the outer surface of the upper end portion of the pipe pile 1. As shown in FIG. 5, the embodiment will be described by taking a rotary pile driver 4 as an example. The end of the pipe pile 1 is prevented from being deformed when the pipe pile end is gripped by the catcher 2. And the pipe pile 1 is erected in the ground while being driven to rotate by the motor through the catcher 2.

  As shown in FIGS. 1 to 4, the plug 3 is screwed into the bolt 7 having a rotation operation head 6 having a diameter larger than that of the male screw portion 5, and is connected to the rotation operation head 6. A nut member 8 having a tapered outer peripheral surface with a smaller diameter toward the closer side, an inner surface portion 13 that is fitted on the outer peripheral surface of the nut member 8 and becomes larger in diameter toward the tip end side of the bolt 7, and the pipe pile 1. A liner 9 having an outer surface portion that can be pressed against the inner peripheral surface, and a top plate 10 that is mounted on the bolt 7 with both front and back end surfaces interposed between the rotary operation head 6 and the liner 9 so as to be able to contact each other. And the liner 9 is divided into eight parts in the circumferential direction to form the divided liner 14, and a holding mechanism 11 is provided for holding the divided liner 14 in a radial direction of the bolt 7 so as to be movable in a predetermined distance. Due to the movement in the axial direction, all the dividing liners 14 Outer diameter formed Te is Yes and configured to be scaled, the stopper 12 to prevent the escape of the nut member 8 from the tip portion of the bolt 7, is mounted on the bolt 7.

  In the divided liner 14 in which the liner 9 is divided, the inner surface portion 13 is inclined in a planar shape, and the surface of the nut member 8 that is in sliding contact with the liner 9 is also inclined in a planar shape. Yes. Therefore, the outer surface shape of the nut member 8 is formed in an octagonal frustum (FIGS. 3 and 4).

  The stopper 12 includes a bottom plate 15 that contacts one end of the nut member 8 and a bolt connecting portion 17 that positions the bottom plate 15 by contacting the bottom plate 15 via a washer 16. It comprises a loosening prevention nut 18. Then, the first protrusion 19 formed at one end of each of the divided liners 14 and the head oval guide pin 20 detachably attached are locked and moved in the bolt radial direction until they contact the inner surface of the pipe pile 1. The bottom plate 15 is provided with a first locking portion 21 that permits the above.

The top plate 10 is engaged with a second protrusion 22 at the other end of each of the split liners 14 to allow movement in the bolt radial direction until it contacts the inner peripheral surface of the pipe pile 1. A portion 23 is provided.
Accordingly, the first locking portion 21 and the second locking portion 23 constitute the holding mechanism 11 that holds the plurality of divided liners 14 in a radial direction of the bolt 7 so as to be movable within a predetermined distance.

  To constitute the first locking portion 21, a first groove 24 into which the first protrusion 19 is fitted is formed on the circumference around the bolt axis, and overlaps with the first groove 24 to guide the pin. As a restricting mechanism for restricting 20 so as to fit and move in the normal direction around the bolt axis, a long hole 26 is provided, and each of the divided liners 14 divided into a plurality is brought close to the periphery of the bolt 7. It is easy to be carried out, and it is made to perform the mounting operation to a pipe pile edge part smoothly (FIGS. 1-4).

To constitute the second locking portion 23, a second groove 27 into which the second protrusion 22 can be fitted is provided on the circumference around the bolt axis, and the top plate 10 and the split liner 14 are mutually connected. Rotation to the pipe pile 1 when the pipe pile 1 is turned up and rotated around its axis with the catcher 2 that holds the pipe pile 1 with relative rotation around the bolt axis. The driving force is not transmitted to the top plate 10 (FIGS. 1 and 3).
That is, as shown in Patent Document 1, the upper end surface of the plug and the catcher are in sliding contact. Also in the present invention, the catcher 2 and the upper end surface of the rotary operation head 6 of the bolt 7 or the upper end surface of the top plate 10 are in sliding contact, and a part of the rotational driving force to the pipe pile 1 is transmitted to the top plate 10. The Since the split liner 14 is firmly fixed to the pipe pile 1, a rotational force is generated between the top plate 10 and the split liner 14. In order not to let this escape and damage the second locking portion 23, relative rotation is allowed.

  The liner 9 is provided with a flange portion 28 which can be brought into contact with the end face of the pipe pile 1 at the end portion on the top plate 10 side, and the flange portion 28 provided on the liner 9 is attached in contact with the end face of the pipe pile 1. By doing so, the liner 9 is prevented from rotating with respect to the pipe pile 1 due to the frictional force between the end face of the pipe pile 1 and the flange portion 28, and as a result, along the bolt axis of the nut member 8. It is designed to ensure forward and backward movement.

  In addition, 29 in the figure is a washer interposed between the rotational operation head 6 of the bolt 7 and the top plate 10, and the pair of holes formed in the top plate 10 are used when the plug 3 is removed from the pipe pile 1. This is a handle locking hole 30.

Next, the operation of mounting the plug 3 on the pipe pile 1 will be described.
(1) As shown in FIGS. 1 (a) and 2 (a), the bolt 7 is rotated to move the nut member 8 away from the rotating operation head 6 until it contacts the bottom plate 15, and all the divided liners 14 are moved. The diameter of the plug 3 is reduced, and the plug 3 in this state is inserted into the end portion of the pipe pile 1.
(2) As shown in FIGS. 1B and 2B, the flange portion 28 is brought into contact with the end portion of the pipe pile 1 so that the bolt 7 and the divided liner 9 do not rotate together. By rotating the bolt 7 in the direction opposite to that described above and bringing the nut member 8 closer to the rotating operation head 6, all the divided liners 14 are expanded in diameter so as to be pressed against the inner surface of the pipe pile 1. To do. By this operation, the plug 3 is friction bonded to the inner surface of the pipe pile 1.
(3) As shown in FIG. 5, the one end of the pipe pile 1 fitted with the plug 3 is held by the catcher 2 while being lifted, and is rotated and driven to stand in the ground.
(4) In addition, the removal of the plug 3 from the upper end part of the pipe pile 1 performs the operation of said (1) again, and extracts from the pipe pile 1. FIG. At this time, the flange portion 28 of the liner 9 frictionally contacts the end portion of the pipe pile 1 so that the nut member 8 does not rotate together with the bolt 7 and the diameter reduction operation is performed reliably (FIG. 1B). (A), FIG. 2 (b) → (a)).
[Another embodiment]
Other embodiments will be described below.

<1> As shown in FIG. 6, the stopper 12 may be composed of a washer 16 and a retaining ring 31 in addition to the bottom plate 15, and may be replaced with a locking nut 18 and a retaining ring 31. A pin that prevents the hexagon nut from rotating may be provided on the hexagon nut.
<2> If the stopper 12 is provided, the holding mechanism 11 does not have the first locking portion 21 and the second locking portion 23 and is elastically fitted to all the divided liners 14 as in the conventional plug 3. An O-ring may be provided. In this case, the diameter of the stopper 12 may be smaller than the maximum diameter of the nut member 8.
<3> The first locking portion 21 may be provided with a protrusion in place of the first groove 24 and a groove into which the protrusion is fitted and locked at the end of the split liner 14.
<4> The second locking portion 23 may also be provided with a protrusion instead of the second groove 27, and a groove into which the protrusion is fitted and locked may be provided at the other end of the divided liner 14.
<5> The bottom plate 15 is provided with a long hole 26 and a first groove 24, and the split liner 14 is provided with a guide pin 20 that fits into the long hole 26 and a first protrusion 19 that fits into the first groove 24. However, instead of providing the first groove 24 and the first protrusion 19 corresponding to the first groove 24, the elongated hole 26 and the guide pin 20 corresponding to the elongated hole 26 may be provided.
<6> The outer peripheral surface of the nut member and the corresponding inner surface portion of the split liner may be conical.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

  The plug of the present invention can be useful for preventing deformation of the tube end.

DESCRIPTION OF SYMBOLS 1 Pipe pile 2 Catcher 3 Plug 5 Male thread part 6 Rotation operation head 7 Bolt 8 Nut member 9 Liner 10 Top plate 11 Holding mechanism 12 Stopper 14 Split liner 15 Bottom plate 17 Bolt connection part 21 1st latching part 23 2nd engagement Stop 28 Blange

Claims (5)

  When gripping the outer surface of the upper end of the pipe pile with a catcher for gripping the pipe pile, in order to mount it in the upper end of the pipe pile, a bolt with a rotary operation head having a diameter larger than the male thread part, and the bolt A nut member having a tapered outer peripheral surface with a smaller diameter toward the side closer to the rotation operation head and screwed together, and fitted on the outer peripheral surface of the nut member to become a larger diameter toward the tip end side of the bolt. A liner having an inner surface portion and an outer surface portion that can be press-contacted to the inner peripheral surface of the pipe pile; A top plate to be mounted on the bolt, and a liner that divides the liner into a plurality of parts in the circumferential direction and forms a split liner, and a holding mechanism that holds the split liner so as to be movable within a predetermined distance in the radial direction of the bolt. , Bolt shaft of the nut member A pile in which the outer diameter formed by all the divided liners can be expanded and contracted by movement in the direction, and a stopper that prevents the nut member from coming out from the tip of the bolt is attached to the bolt Plug for gripping.   The pile holding mechanism according to claim 1, wherein the holding mechanism is provided between at least one end of the split liner and the stopper and at least one of the other end of the split liner and the top plate. Plug.   The plug for gripping piles according to claim 1 or 2, wherein the liner is provided with a flange portion capable of coming into contact with an end face of the pipe pile.   The said top plate and the said division | segmentation liner have latched the said division | segmentation liner with the said holding mechanism so that the relative rotation of the surroundings of a bolt axis center may be permitted. Plug for holding pile as described in 1.   The holding mechanism is provided between the split liner and the stopper, and a restriction mechanism is provided in the holding mechanism for restricting each of the split liners to move in the normal direction of the bolt axis. 5. A pile gripping plug according to any one of the above.

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