JP2014055449A - Ball core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball core that enables cores of bolt holes to be aligned without making a loud sound.SOLUTION: In a ball core, cores of bolt holes formed in a plurality of stacked members to be joined are aligned with one another. The ball core includes a head to which torque is imparted by torque imparting means, an insertion part that is extended out from the head and that has a diameter reduced gradually, and a screw part that makes the insertion part generate an insertion force along with the application of the torque to the head.

Description

  The present invention relates to a ball core for aligning cores of bolt holes respectively formed on stacked members to be joined.

  In steel construction, when steel members are joined together by bolt fastening via a joining plate such as a splice plate or gusset plate, generally the core of the bolt hole formed in the steel member and the bolt hole formed in the joining plate Align the core with the ball core.

  Since the ball core is struck into the bolt hole by a metal hammer or the like, a large hitting sound is accompanied when the ball core is used to align the core of the bolt hole. On the other hand, Cited Document 1 discloses a bolt hole centering jig in which a striking sound mitigating member is provided between a main body formed in a wedge shape and a cap placed on the head of the main body. Yes. The vibration generated when the cap is struck by a metal hammer or the like when aligning the cores of the bolt holes is absorbed by the striking sound alleviating member, thereby reducing the striking sound.

  However, the bolt hole centering jig of the cited document 1 reduces the striking force as well as the striking sound, and therefore cannot efficiently hit the main body into the bolt hole.

JP 2006-37536 A

  In view of such a fact, an object of the present invention is to provide a ball core capable of aligning the cores of bolt holes without making a loud noise.

  According to the first aspect of the present invention, in the ball core for aligning the cores of the bolt holes formed on the plurality of members to be joined, the head to which torque is applied by the torque applying means, and the head extending from the head. A ball core having an insertion portion that is gradually reduced in diameter and a screw portion that generates an insertion force in the insertion portion with application of torque to the head portion.

  In the first aspect of the present invention, a plurality of members to be joined are stacked, and the insertion portions are inserted into these bolt holes in a state where the cores of the bolt holes formed in these members to be joined are displaced from each other. Then, torque is applied to the head by the torque applying means to rotate the insertion portion, and an insertion force is generated in the insertion portion by the screw portion. Accordingly, the insertion portion is inserted into the bolt hole so that the outer peripheral surface (tapered surface) of the insertion portion becomes a guide surface, and the position of the bolt hole is shifted, and the cores of the bolt holes are aligned. Therefore, the core of the bolt hole can be aligned without making a loud noise.

  Further, since it is not necessary to hit the head with a hammer or the like when inserting the insertion portion into the bolt hole, it is possible to prevent injuries to hands, fingers, etc. due to damage.

  According to a second aspect of the present invention, in the ball core according to the first aspect, the screw portion is a spiral groove formed on an outer peripheral surface of the insertion portion.

  In the invention described in claim 2, an insertion force is generated in the insertion portion by the spiral groove formed on the outer peripheral surface of the insertion portion. Therefore, a screw part can be simply constituted only by forming a groove (spiral groove) in the insertion part.

  According to a third aspect of the present invention, in the ball core according to the first aspect, the screw portion extends from the insertion portion, and is connected to the bonded member on the opposite side of the head with respect to the bonded member. It is a male screw that is screwed into a female screw provided in the installed cradle.

  In the invention according to claim 3, an insertion force is generated in the insertion portion by screwing the male screw extending from the insertion portion into the female screw provided in the cradle. Therefore, an insertion force can be reliably generated in the insertion portion by the screw structure including the male screw and the female screw.

  Since the present invention is configured as described above, the cores of the bolt holes can be aligned without making a loud noise.

It is a perspective view showing a ball core concerning a 1st embodiment of the present invention. It is explanatory drawing which shows the effect | action of the ball core which concerns on 1st Embodiment of this invention. It is a side view which shows the insertion part of the ball core which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the effect | action of the ball core which concerns on 2nd Embodiment of this invention.

  A first embodiment of the present invention will be described with reference to the drawings. First, the ball core according to the first embodiment of the present invention will be described.

  As shown in the perspective view of FIG. 1, the ball core 10 according to the first embodiment includes a head portion 12, a cylindrical portion 14, and an insertion portion 16. The head 12 is a regular hexagon so that torque can be applied by engaging and turning the mouth of a tool (hereinafter referred to as a “clamping tool”) as torque applying means such as a single-ended wrench, electric wrench, or spanner. It is formed in a column shape.

  The cylindrical portion 14 is formed to extend in a columnar shape from the head 12 toward the tip of the ball core 10 (hereinafter referred to as “tip 18”). The insertion portion 16 is formed to extend from the cylindrical portion 14 toward the tip 18 in a tapered shape. That is, the diameter of the insertion portion 16 is gradually reduced from the cylindrical portion 14 toward the tip 18. A spiral groove 22 as a screw portion is formed on the tapered surface 20 constituting the outer peripheral surface of the insertion portion 16 so as to be in the winding direction of the right screw.

  The ball core 10 may be formed by any method. For example, the tip of the high tension bolt may be cut into a taper shape, and then a spiral groove may be cut on the taper surface.

  Next, the operation and effect of the ball core according to the first embodiment of the present invention will be described.

  2 (a) and 2 (b), in order to join the H-section steels 24 to each other via the splice plate 28 (FIGS. 2 (a) and 2 (b) depict only one H-section steel 24). In the operation of bolting the flange 26 of the H-shaped steel 24 and the splice plate 28, the core of the bolt hole 30 formed in the flange 26 using the ball core 10 of the first embodiment, An example is shown in which the core of the bolt hole 32 formed in the splice plate 28 is matched.

  As shown in FIG. 2A, the flange 26 of the H-shaped steel 24 as a member to be joined and the splice plate 28 are overlapped to form the core of the bolt hole 30 formed in the flange 26 and the splice plate 28. The insertion portion 16 of the ball core 10 is inserted into the bolt holes 30 and 32 in a state where the core of the bolt hole 32 is displaced.

  Then, as shown in FIG. 2 (b), torque is applied to the head 12 of the ball core 10 by a tightening tool to rotate the insertion portion 16 clockwise (arrow T), and this rotation (the torque applied to the head 12). The insertion force F is generated in the insertion portion 16 by the spiral groove 22 as the screw portion.

  Accordingly, the insertion portion 16 is inserted into the bolt holes 30 and 32 so that the tapered surface 20 of the insertion portion 16 becomes a guide surface and the positions of the bolt holes 30 and 32 are shifted. The core of the bolt hole 32 is aligned. Therefore, the cores of the bolt holes 30 and 32 can be aligned without making a loud noise. For example, when a conventional ball core is struck into a bolt hole with a metal hammer or the like, a generated sound of about 110 dB is generated. When the ball core 10 is used, the cores of the bolt holes 30 and 32 are aligned with a generated sound of about 50 dB or less. Can do. Thereby, it becomes possible to carry out the construction while staying.

  In addition, when inserting the insertion portion 16 of the ball core 10 into the bolt holes 30 and 32, it is not necessary to hit the head 12 with a hammer or the like, so that it is possible to prevent injuries of hands, fingers, and the like due to damage.

  Further, by forming the screw portion as the spiral groove 22, the screw portion can be configured simply by forming a groove (spiral groove 22) in the insertion portion 16.

  In order to effectively generate the insertion force F at the insertion portion 16 by the spiral groove 22, as shown in the side view of FIG. 3, the groove width w of the spiral groove 22 is 0.5 mm or more and 2.0 mm. The groove depth h is preferably 0.5 mm or more and 2.0 mm or less, and the angle θ with respect to the axis x of the ball core 10 is preferably 15 degrees or more and 45 degrees or less, and the groove width w of the spiral groove 22 is 1 More preferably, the thickness is 0.5 mm, the groove depth h is 1.0 mm, and the angle θ of the ball core 10 with respect to the axis x is 30 degrees.

  Further, it is preferable to use an electric wrench as the torque applying means because the insertion portion 16 of the ball core 10 can be screwed into the bolt holes 30 and 32 quickly.

  Next, a ball core according to a second embodiment of the present invention will be described.

  In the description of the second embodiment, components having the same configurations as those of the first embodiment are denoted by the same reference numerals and are appropriately omitted. As shown in FIG. 4A, the ball core 34 according to the second embodiment includes a head portion 12, a cylindrical portion 14, an insertion portion 16, and a tip portion 36.

  The tip portion 36 is formed to extend from the insertion portion 16 toward the tip 18 of the ball core 34 in a cylindrical shape. Further, a male screw 38 serving as a right-hand screw is formed on the outer peripheral surface of the tip portion 36. The outer diameter of the distal end of the insertion portion 16 and the outer diameter (mountain diameter) of the male screw 38 are substantially equal. The ball core 34 may be formed by any method. For example, a high tension bolt may be formed by machining and threading.

  On the back surface 40 of the flange 26 of the H-shaped steel 24, a steel pedestal 42 formed in a gate shape is installed. That is, the cradle 42 is installed on the flange 26 at a position opposite to the head 12 of the ball core 34 with respect to the splice plate 28 and the flange 26 as the members to be joined.

  A through hole 46 having a diameter (larger than the diameter of the male screw 38) that allows the tip 36 to be inserted is formed in the top 44 of the cradle 42. A nut 48 is fixed to the top portion 44 by welding so that the through hole 46 and the screw hole communicate with each other. Further, a female screw 50 into which a male screw 38 formed at the tip 36 is screwed is formed on the inner wall surface of the screw hole of the nut 48.

  The installation surface 54 of the leg portion 52 of the cradle 42 is only in contact with the back surface 40 of the flange 26 and is not fixed by welding or the like. However, when the distal end portion 36 is screwed into the nut 48, the cradle 42 A frictional resistance to the extent that the 42 does not co-rotate is generated between the rear surface 40 of the flange 26. For example, the installation surface 54 is roughened or a rubber for preventing slipping is pasted.

  Next, operations and effects of the ball core according to the second embodiment of the present invention will be described.

  4 (a) and 4 (b), in order to join the H-section steels 24 to each other via the splice plate 28 (FIGS. 4 (a) and 4 (b) show only one H-section steel 24. In the operation of bolting the flange 26 of the H-shaped steel 24 and the splice plate 28, the core of the bolt hole 30 formed in the flange 26 using the ball core 34 of the second embodiment, An example is shown in which the core of the bolt hole 32 formed in the splice plate 28 is matched.

  As shown in FIG. 4A, the flange 26 of the H-shaped steel 24 as a member to be joined and the splice plate 28 are overlapped, and the core of the bolt hole 30 formed in the flange 26 and the splice plate 28 are formed. In a state where the center of the bolt hole 32 is displaced, the tip portion 36 and the insertion portion 16 of the ball core 34 are inserted into these bolt holes 30 and 32.

  Then, with the pedestal 42 installed on the back surface 40 of the flange 26, the tip 36 (male screw 38) is screwed into the nut 48 (female screw 50). Further, as shown in FIG. Thus, torque is applied to the head 12 of the ball core 34 to rotate the insertion portion 16 clockwise (arrow T), and with this rotation (giving torque to the head 12), the female screw 50 and the male screw 38 An insertion force F is generated in the insertion portion 16 by the screw structure constituted by the following.

  Accordingly, the insertion portion 16 is inserted into the bolt holes 30 and 32 so that the tapered surface 20 of the insertion portion 16 becomes a guide surface and the positions of the bolt holes 30 and 32 are shifted. The core of the bolt hole 32 is aligned. Therefore, the cores of the bolt holes 30 and 32 can be aligned without making a loud noise. For example, when a conventional ball core is struck into a bolt hole with a metal hammer or the like, a generated sound of about 110 dB is generated. Can do. Thereby, it becomes possible to carry out the construction while staying.

  Further, when inserting the insertion portion 16 of the ball core 34 into the bolt holes 30 and 32, it is not necessary to hit the head 12 with a hammer or the like, so that it is possible to prevent injuries of hands, fingers and the like due to damage.

  Furthermore, an insertion force F can be reliably generated in the insertion portion 16 by the screw structure constituted by the male screw 38 and the female screw 50.

  The first and second embodiments of the present invention have been described above.

  In the first embodiment, the example in which the spiral groove 22 is formed on the outer peripheral surface (tapered surface 20) of the insertion portion 16 has been described. However, the spiral groove 22 is not formed in the vicinity of the distal end 18 of the insertion portion 16. May be. In this case, first, the ball core 10 (insertion portion 16) is lightly tapped with a hammer or the like, and the insertion portion 16 is rotated in the middle to generate an insertion force F in the insertion portion 16.

  In the first embodiment, the spiral groove 22 is formed so as to be in the winding direction of the right-hand screw, but the spiral groove 22 may be formed so as to be in the winding direction of the left-hand screw. Furthermore, in the second embodiment, an example in which the male screw 38 is a right screw is shown, but the male screw 38 may be a left screw.

  Moreover, in 1st and 2nd embodiment, as shown to FIG. 2 (a), (b) and FIG. 4 (a), (b), it forms in the flange 26 using the ball cores 10 and 34. As shown in FIG. Although the example in which the cores of the bolt holes 30 and the cores of the bolt holes 32 formed in the splice plate 28 are matched is shown, the ball cores 10 and 34 of the present embodiment can be used with various members to be joined (for example, splices). Plate, gusset plate, etc., can be used when bolting shape steel and shape steel), and the cores of bolt holes formed in a plurality of overlapped members can be aligned. .

  The first and second embodiments of the present invention have been described above. However, the present invention is not limited to these embodiments, and the first and second embodiments may be used in combination. Needless to say, the present invention can be implemented in various forms without departing from the gist of the invention.

10, 34 Ball core 12 Head 16 Insertion section 20 Tapered surface (outer peripheral surface)
22 Spiral groove 26 Flange (joined member)
28 Splice plate (member to be joined)
30, 32 Bolt hole 38 Male screw 42 Receiving base 50 Female screw F Insertion force

Claims (3)

In the ball core that aligns the cores of the bolt holes formed on the multiple members to be joined,
A head to which torque is applied by torque applying means;
An insertion portion extending from the head and gradually reducing its diameter;
A screw portion that generates an insertion force in the insertion portion with the application of torque to the head;
Having a ball core.   The ball core according to claim 1, wherein the screw portion is a spiral groove formed on an outer peripheral surface of the insertion portion.   The screw part is a male screw that extends from the insertion part and is screwed into a female screw included in a cradle installed on the member to be joined on the opposite side of the head with respect to the member to be joined. The ball core described.

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