JP2019173308A - Chuck device for steel pipe - Google Patents

Abstract

To provide a chuck device for a steel pipe capable of chucking and releasing an outer peripheral surface of the steel pipe through triggering motion of a chuck mechanism with rotational power transferred from an outer driving source.SOLUTION: A chuck mechanism is composed of: an outer frame body 3 which is a regular hexagonal column shape space provided with opening at both ends, inside which a motion space 31 is configured by a V-grooves at each corner and a cum surface at each side part; holder bodies 4 co-axially arranged with a predetermined space apart from an inner wall of the motion space; a chuck pin 5 in a circular column shape exposed to inner and outer peripheral surfaces at a position corresponding to each corner of the holder body and being pivotably held; and a supporting base 2 and a limit plate 7 allowing the holder bodies holding the chuck pin to axially rotate, as well as being respectively fitted in the openings of both end of the outer frame body through being provided with through-hole openings 21, 71 through which a steel pipe p is penetrated, where an axial diameter of the chuck pin is formed smaller than a gap between an outer peripheral surface of the steel pipe inserted in the holder body and V-grooves at each corner in the motion space as well as is formed larger than a gap distance from the cum surface continuously following each of the V-grooves.SELECTED DRAWING: Figure 1

Description

  The invention according to the present application (hereinafter referred to as “the present invention”) is a steel pipe for transmitting rotational force and propulsive force in the embedding direction to a steel pipe buried in the ground as a foundation pile of a structure or an underground heat exchange well. The present invention relates to a chuck device.

  Conventionally, there has been a rotary pile method using a steel pipe pile mainly composed of a steel pipe as a foundation pile of a building. In this method, a steel pipe pile is gripped via a chuck device by an embedding device composed of a rotary drive source capable of moving up and down. Such a chuck device grips the steel pipe pile and transmits a rotational force and a propulsive force in the burying direction.

  As a configuration example of such a chuck device, Patent Document 1 discloses that an inner cylinder is provided on a cam shaft used by being inserted from an upper end opening of a steel pipe pile, a window hole is formed in the inner cylinder, and a pressing piece arranged in the window hole is cammed. A chuck device for a steel pipe pile is disclosed in which the inner surface of a steel pipe pile is crimped by pressing in the radial direction as the shaft rotates.

  On the other hand, there was also a device that grips the outer peripheral side of the steel pipe pile. For example, Patent Document 2 discloses a cylindrical body gripping device that grips the outer peripheral surface of a steel pipe pile by reducing the diameter of a narrow liner that is equally divided by the movement of a cam surface and the rotation of a roller.

  In Patent Document 3, a clutch holding part and a clutch piece are provided between the rotation transmission mechanism and the steel pipe pile to constitute the clutch mechanism, and the cam forming part of the clutch holding part is rotated clockwise when the motor is driven. And a steel pipe pile rotation transmission device that rotates the lever portion of the clutch piece in contact with the outer peripheral surface of the steel pipe pile.

JP 2007-169890 A JP 04-49194 A JP 2006-169868 A

  However, the chuck device for steel pipe piles in the above patent document has the following problems.

  First, since the chuck apparatus of patent document 1 is the structure which hold | grips a steel pipe pile internal peripheral surface and transmits rotational force after inserting a part of apparatus from the upper end opening part of the steel pipe pile to embed, Therefore, it is necessary to stably hold and rotate the chuck device. For this reason, the entire size of the embedding device including the driving source is increased in the height direction, and it is difficult to embed in a narrow site where the height is limited or where the embedding device is difficult to arrange. . Although the cylindrical body gripping device of Patent Literature 2 is configured to grip the outer peripheral side of the steel pipe pile, there is a problem similar to that of the chuck device of Patent Literature 1 in that it is disposed at the upper end of the steel pipe pile.

  On the other hand, since the steel pipe pile rotation transmission device of Patent Document 3 is not configured to hold the outer peripheral side of the steel pipe pile and to be disposed at the upper end portion of the steel pipe pile, there is an advantage that the entire embedding device does not increase in size. However, the structure of the apparatus is complicated because it is necessary to assemble and arrange the clutch mechanism, which is the main component of the apparatus, and the large and small gears, cams, pins, and complex-shaped clutch pieces that are the elements of the clutch mechanism. At the same time, there was a great risk of failure.

  Therefore, the present invention was invented for the purpose of solving these problems, and triggered by the rotational force transmitted from the external drive source, the chuck mechanism was automatically operated to exchange the steel pipe piles or underground heat. The present invention provides a chuck device for gripping or opening a steel pipe used for a well.

  In order to solve the above problems, a steel pipe chuck device (hereinafter referred to as “chuck device”) according to the present invention is configured as follows.

  That is, a cylindrical outer frame body that is a regular polygonal column-shaped space with both ends open, and that has an inner working space formed by a V groove at each corner and a cam surface at each side, and the outer frame A cylindrical holder body coaxially arranged at a predetermined interval from the inner wall of the working space of the body, and rotatable at a position corresponding to each corner of the regular polygon of the holder body while being exposed on the inner and outer peripheral surfaces A cylindrical chuck pin of a predetermined length held along the axis, and a holder body holding the chuck pin, which has a through-hole through which the steel pipe can pass while allowing the holder body to rotate and open both ends of the outer frame body Each comprising a support base and a restraining plate fitted to each part, and the shaft diameter of the chuck pin is inserted into the holder body, and the outer peripheral surface of the steel pipe and the V-groove at each corner of the working space The distance between each V-groove and the cam surface that is smaller than the distance between It is characterized in that it has a larger form.

  The chuck device having the above configuration is used by being arranged at an arbitrary position on the outer peripheral side of the steel pipe. The steel pipe is gripped by the chuck device by rotating the holder body by a predetermined angle with respect to the outer frame body. More specifically, when the entire chuck device is rotated by an external drive source, a frictional force is generated on the contact surface between the outer peripheral surface of the steel pipe and the chuck pin, so that the holder body holding the chuck pin is relative to the outer frame body. Rotate on the axis. In accordance with the relative rotation of the holder body, the chuck pin moves from the V groove at each corner of the working space to the cam surface connected thereto. At this time, since the shaft diameter of the chuck pin is larger than the distance between the outer surface of the steel pipe and the cam surface, the chuck pin sandwiched between the outer peripheral surface of the steel pipe and the cam surface of the working space according to the shaft rotation of the holder body The contact surface pressure increases. This becomes resistance and the relative rotation of the holder body stops, and the chuck device rotates together with the steel pipe. As a result, the rotational force from the external drive source is directly transmitted to the steel pipe via the chuck device. It can be said that this chuck pin functions as a “wedge”.

  Here, the number of squares of the regular polygon forming the working space of the outer frame body is not limited, but a regular hexagon or regular octagon is preferable in consideration of gripping stability of the steel pipe having a cylindrical cross section and holding in the holder body. .

  The holder body may be provided with a biasing means for biasing the chuck pin from the inner peripheral surface of the holder body to an exposed state. Thereby, a contact with a chuck pin and the outer peripheral surface of a steel pipe can be ensured.

  By the way, as a function of the urging means, the chuck pin is moved in the axial center direction with respect to the outer peripheral surface of the steel pipe so as to be always in a contact state, and relative rotation of the holder body and the steel pipe starts when the outer frame starts to rotate. It will be a chance to make smooth. For example, if the chuck pin is positioned in the V groove in the working space of the outer frame body and is not in contact with the outer peripheral surface of the steel pipe, the rotation of the holder body that holds the chuck pin even when the outer frame body rotates is started. May be delayed and may be operatively unstable.

  Therefore, instead of the biasing means as described above, a chuck pin may be previously brought into contact with the outer peripheral surface of the steel pipe, and a means for urging the holder body to rotate relative to the outer frame body may be disposed. As the hooking means, for example, a lever that rotates the holder body in advance at a predetermined angle with respect to the outer frame body is disposed on the holder body, and if necessary, interference between the lever and the outer frame body or the restraining plate is caused. It is good also as a structure to avoid.

  The chuck device of the present invention has the following effects by being configured as described above.

  It is possible to automatically and firmly grip the steel pipe wrapped around when the chuck device is rotated by the connected external drive source, and continuously apply the rotational force and propulsive force in the burial direction via the chuck device. Can be communicated to. In addition, after stopping the external drive source, it is possible to easily release the steel pipe by reverse rotation or manual reverse rotation.

  Moreover, since the transmission of the rotational force and the like to the steel pipe is performed by mounting the chuck device on the outer peripheral side of the steel pipe, the transmission action position can be performed at an appropriate height position of the steel pipe, and this action position Can be easily changed one after another, and can also be quickly removed from the upper end of the steel pipe.

  Furthermore, since there is no restriction on the chuck position if it is on the outer periphery side of the steel pipe, the entire embedding apparatus including the height direction can be made smaller than the conventional apparatus that grips the upper end side of the steel pipe. This makes it possible to use the steel pipe efficiently in a place where the height is limited or in a small site.

It is a partially cutaway perspective view showing an overview of the chuck device of the present embodiment. It is a longitudinal cross-sectional view of the chuck apparatus of a present Example. FIG. 3 is a sectional view taken along line AA in FIG. 2. It is a partially cutaway assembly view of the chuck device of the present embodiment. It is operation | movement explanatory drawing (A) of the chuck apparatus of a present Example, (B). It is explanatory drawing which shows the embedding condition of the steel pipe pile using the chuck apparatus of a present Example.

  Hereinafter, the best embodiment of the chuck device according to the present invention will be described in detail with reference to the drawings. In addition, as a present Example, the holding object of a chuck apparatus is demonstrated as a steel pipe pile.

  Reference numeral 1 in FIG. 1 is a chuck device according to the present embodiment. The support base 2 that supports the entire chuck device 1 is formed in a thick annular shape having a through-hole 21 through which a steel pipe pile P, which is an object to be rotated, penetrates, at the center. A sliding surface 22 having a predetermined width is formed around the edge of the through hole 21 so as to be a step position one step lower than the upper surface on the ring. The support base 2 of this embodiment is not only a support member for the entire apparatus, but also a connection member for an external drive source that generates a rotational force and a propulsive force in the burying direction.

  A cylindrical outer frame body 3 is arranged and fixed on the sliding surface 22 of the support base 2 with the lower end face adapted. The outer frame 3 forms a regular polygonal column-shaped working space 31 opened vertically at the center, and the outer peripheral portion is formed in a circular shape that fits in the inner surface of the step of the sliding surface 22. Due to the fixed arrangement of the outer frame body 3 with respect to the support base 2, the coaxial positioning and mounting stability of the outer frame body 3 and the support base 2 are ensured.

  The working space 31 of the outer frame 3 has a regular hexagonal column shape, and is located on the inner side surface of the V-groove 31a continuous in the axial direction at the positions of the corners and on the sides. A cam surface 31b that is continuous with the V-groove 31a is formed. The cam surface 31b may be a flat curved surface or a convex curved surface slightly advanced to the axial side. Further, a series of grooves 32 for accommodating a garter spring 6 described later are formed in a slightly circular position at a position below the working space 31.

  Although the working space 31 of the present embodiment has a regular hexagonal prism shape, it is not limited to this, and a regular octagonal prism shape is preferable in consideration of securing a predetermined gripping force and storing property in the holder body 4. It is.

  A cylindrical holder body 4 having the same height dimension as that of the outer frame body 3 is disposed in the outer frame body 3 so as to be substantially inscribed in the working space 31 from the inner surface at a predetermined interval and coaxially. The holder body 4 has an outer diameter dimension such that the outer peripheral side surface of the outer diameter is close to the cam surface 31 b of the working space 31, and the inner diameter is substantially the same as the through hole 21 of the outer frame body 3. The lower end surface is slidably mounted on the sliding surface 22 of the outer frame 3.

  Further, the holder body 4 is formed with slits 41 notched in the axial direction by about 70% from the end surface on the lower end side at positions equal to the circumference 6. Each of the slits 41 accommodates a chuck pin 5 having a cylindrical shape with a predetermined length from the opening and having tapered surfaces 51 formed on the upper and lower ends.

  The chuck pin 5 has a height dimension of about 70% of the total height of the holder body 4 as described above, while an axial diameter of the chuck pin 5 and the outer frame body of the steel pipe pile P in a state of penetrating the holder body 4. 3 is set to be smaller than the distance from the V groove 31a of the working space 31 and larger than the distance from the cam surface 31b.

  Here, the shape of the slit 41 is such that the inner width of the chuck pin 5 is smaller than the shaft diameter of the chuck pin 5 so that the chuck pin 5 does not fall off while the chuck pin 5 can be rotated. It is formed to become. The chuck pin 5 in the state of being accommodated in the slit 41 is in a state in which the top of the lower end surface is in contact with the sliding surface 22 of the support base 2.

  With the storage configuration of the chuck pin 5 in the holder body 4, the chuck pin 5 is in a state where a part of the side surface is exposed from the inner side surface and the outer side surface of the holder body 4.

  The holder body 4 holding the chuck pins 5 is provided with a biasing means for biasing the chuck pins 5 from moving from the inner peripheral surface of the holder body 4 in the axial direction. This urging means is a garter spring 6 that is wound around so as to bundle six chuck pins 5 housed in the holder body 4. The garter spring 6 causes the chuck pin 5 to be exposed from the slit 41 to the inside of the holder body 4 with elasticity due to contraction biasing force.

  Further, a groove 32 having a depth capable of accommodating the garter spring 6 is formed on the inner peripheral side surface of the outer frame body 3 corresponding to the wound garter spring 6.

  Next, a restraining plate 7 is disposed on the upper end side of the outer frame body 3 in which the holder body 4 is built. The restraining plate 7 has a thick annular shape in which a through hole 21 of the support base 2 and an insertion port 71 having the same diameter as the inner diameter of the holder body 4 are formed at the center. The insertion port 71 has the same function of allowing the steel pipe pile P to pass therethrough like the through hole 21 of the support base 2, and further forms a tapered portion 72 so that the steel pipe pile P can be easily passed.

In addition, the restraining plate 7 is fixed to the upper end surface of the outer frame body 3, while being disposed only in contact with the upper end surface of the holder body 4. For this reason, it is prevented that the holder body 4 moves (position shift | offset | difference) to an axial direction with respect to the outer frame body 3. FIG.
[Action]

  Next, the operation of the chuck device 1 according to the present embodiment will be described below with reference to FIGS.

  First, in a state where a predetermined steel pipe pile P is passed through the chuck device 1, the chuck device 1 is arranged at an arbitrary position on the outer peripheral side. In addition, since the chuck apparatus 1 of a present Example makes the outer periphery side of the steel pipe pile P an object of gripping, it is not necessary to arrange | position to the steel pipe pile upper end part like the conventional chuck apparatus.

  Next, the support base 2 connected thereto is rotated through an external drive source (arrow r). Immediately after the start of the shaft rotation, the outer frame body 3 fixed to the support base 2 starts to rotate, while the holder body 4 inscribed in the working space 31 is subjected to the inertia of trying to stay at that position. Since a frictional force is generated on the contact surface between the outer peripheral surface of the steel pipe pile P and the chuck pin 5, the shaft is temporarily rotated in the opposite direction (arrow s).

  By this relative rotation, each chuck pin 5 comes into contact with the outer peripheral surface of the steel pipe pile P while moving from the V groove 31a at each corner of the working space 31 to the cam surface 31b connected thereto. The contact surface pressure (arrow t) at this time is proportional to the increase in the axial rotation angle of the outer frame 3 because the shaft diameter of the chuck pin 5 is larger than the distance between the outer peripheral surface of the steel pipe pile P and the cam surface 31b. And increase. This serves as a resistance and the relative rotation of the holder body 4 stops, and also functions as a “wedge” when the chuck pin 5 is driven into the outer peripheral surface of the steel pipe pile and the cam surface 31b of the working space 31. And the same effect | action by the several chuck pin 5 overlaps, and the firm holding | grip of the outer peripheral surface of the steel pipe pile P is attained.

  In this gripping state, the holder body 4 is fixed to the outer frame body 3, and the rotational force of the external driving force can be transmitted to the steel pipe pile P. Further, in this state, since the plurality of chuck pins 5 are in contact with the steel pipe pile P at the bus bar portion excluding the tapered surface 51, it is possible to transmit not only the rotational force but also the thrust force in the thrust direction (embedding direction). It has become.

  The chuck device 1 of the present embodiment can transmit the rotational force by the external drive source and the thrust force in the thrust direction to the steel pipe pile P by the above-described action, and when the screw blade Ps is on the tip side of the steel pipe pile P, both the effects are obtained. Coupled with this, smooth burial construction is possible.

  On the other hand, if the chuck device 1 of the present embodiment does not continue to apply the axial rotational force from the external drive source, the chuck pin 5 does not function as a wedge as described above, so that a sufficient gripping force cannot be exerted, and the rotational force and the propulsive force are neither. It becomes impossible to transmit to the steel pipe pile.

  However, if this property is utilized, it is possible to easily release the grip of the chuck device 1 from the steel pipe pile P by stopping the external drive source or performing reverse rotation or manual reverse rotation. For this reason, an arbitrary position of the steel pipe pile P can be gripped and embedded over a predetermined length, and after releasing the grip, the chuck device 1 can be lifted (arrow u), and then gripped again at that position to perform the burying operation. It becomes possible. That is, since the action position can be easily changed sequentially in this way, even a steel pipe pile P that is somewhat long can be constructed with an embedding device in which the lifting mechanism is downsized.

  Moreover, since the chuck | zipper apparatus 1 of a present Example makes the outer periphery side of the steel pipe pile P the object to be gripped as well as the holding position is arbitrary as described above, it is limited to the cylindrical steel pipe pile P if the outer shape is circular. It is not a thing, but it is applicable also to a column-shaped appropriate rotation pile.

DESCRIPTION OF SYMBOLS 1 Chuck apparatus 2 Support base 21 Through-hole 22 Sliding surface 3 Outer frame body 31 Working space 31a V groove 31b Cam surface 32 Groove 4 Holder body 41 Slit 5 Chuck pin 51 Tapered surface 6 Garter spring 7 Suppression plate 71 Insertion port 72 Tapered part P Steel pipe pile Ps Screw blade

That is, a space of regular polygonal prism shape whose both ends open, to form a working space constituted by the cam surfaces of the side portion along the both ends of the effective band direction continuing from the V groove and the V-groove of each corner on the inside a cylindrical outer frame body, in the working space of the outer frame member, and a cylindrical holder body open at both ends which is disposed coaxially with the rotatable at a predetermined distance from the inner surface wall and the positive polygonal of the holder body a position corresponding to each corner of the cylindrical chuck pins having a predetermined length which is freely held shaft rotation along the axial direction of the holder body being exposed from the inner peripheral surface, to the holder body Comprising a support base and a restraining plate each having an opening for penetrating a steel pipe and fitted to both open ends of the outer frame body, and the shaft diameter of the chuck pin is coaxial with the holder body between the outer peripheral surface and the V-groove of each corner of the working space of the steel pipe while being penetrated on隔距Is characterized in that together with, and was larger than the gap distance between the cam surface is formed smaller than.

The holder body may be provided with a biasing means for biasing the chuck pin toward the inside of the holder body. Thereby, a contact with a chuck pin and the outer peripheral surface of a steel pipe can be ensured.

Claims (4)

A cylindrical outer frame body that is a regular polygonal column-shaped space that is open at both ends, and that has an inner working space formed by a V-groove at each corner and a cam surface at each side;
A cylindrical holder body coaxially arranged at a predetermined interval from the inner wall of the working space of the outer frame body;
A cylindrical chuck pin of a predetermined length held along the axis in a state of being exposed to the inner and outer peripheral surfaces and being rotatable at positions corresponding to the corners of the regular polygon of the holder body;
A support base and a deterrent plate, each of which has a through-hole through which a steel pipe can be passed while allowing the holder body holding the chuck pin to be pivoted and fitted to both open ends of the outer frame body;
Consisting of
The shaft diameter of the chuck pin is smaller than the distance between the outer peripheral surface of the steel pipe penetrated into the holder body and the V groove at each corner of the working space, and the cam surface is connected to the V groove. A steel pipe chuck device characterized in that it is formed larger than the distance. In the holder body,
2. The chuck device for a steel pipe according to claim 1, further comprising biasing means for biasing the chuck pin in an exposed state from an inner peripheral surface of the holder body. In the configuration of the biasing means,
3. The steel pipe chuck device according to claim 2, wherein the chucking device is a stretchable band in which each chuck pin exposed from the outer peripheral surface of the holder body is wound. The elastic band,
A garter spring that is wound together with the entire outer periphery of the holder body and a part of the outer shape of the exposed chuck pin,
4. The chuck device for a steel pipe according to claim 3, wherein a groove for retracting the garter spring is formed on an inner peripheral side surface of the outer frame body.

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