JP2018184761A - Reinforcement gripping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a pressing member in a reinforcement gripping device in which the pressing member of a pressing bolt can swing with respect to a bolt main body.SOLUTION: A columnar protrusion 56c is coaxially and integrally provided on a shaft portion 56 of a pressing member 52, the protrusion 56c is fitted into a fitting hole 66c provided coaxially at a bottom of an insertion hole 66 of a bolt main body 50 with a play e1, and the protrusion 56c is brought into contact with an inner wall surface of the fitting hole 66c so that the swing of the pressing member 52 is restricted. Thereby, the load applied to a neck portion 56b of the pressing member 52 is reduced, and the durability of the pressing member 52 can be improved. The load is applied to a root portion of the protrusion 56c by bringing the protrusion 56c into contact with the inner wall surface of the fitting hole 66c, however, a predetermined durability can be ensured by appropriately setting the diameter dimension of the protrusion 56c.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a reinforcing bar gripping device, and more particularly, to an improvement of a reinforcing bar gripping device in which a pressing member of a pressing bolt that clamps and holds a reinforcing bar with a reinforcing bar receiving portion is swingable with respect to a bolt body. It is.

  (a) In order to grip a reinforcing bar that is spaced apart in the longitudinal direction and has a large number of nodes on the outer peripheral surface from a direction perpendicular to the longitudinal direction, (b) a pressing provided with a pressing surface that is pressed against the reinforcing bar And a pressing member integrally provided on the first axis, and an insertion hole into which the shaft is inserted is provided on the second axis. And a bolt main body provided with a contact receiving portion in which the contact portion is slidably slidably contacted in the insertion hole, and the pressing member includes the contact portion and the contact portion. A pressing bolt that is swingably held on the bolt body via a contact portion; (c) a bolt screwing portion provided with a screw hole into which the pressing bolt is screwed; and a side surface of the reinforcing bar. Reinforcing bars provided to face the pressing bolt screwed into the bolt screwing portion for receiving And (d) a gripping member that integrally holds the reinforcing bar between the pressing bolt screwed to the bolt screwing part and the reinforcing bar receiving part. For example, a reinforcing bar gripping device is used in a reinforcing bar welding apparatus that presses and presses a pair of reinforcing bars in the axial direction while abutting a pair of reinforcing bars in the axial direction. The device described in Patent Document 1 is an example, and the pressing member can swing with respect to the bolt main body, so that the reinforcing bar can be appropriately gripped regardless of protrusions such as nodes of the reinforcing bar. In addition, since the reinforcing bars can be properly gripped, it is possible to prevent the reinforcing bars from being wrinkled due to slippage between the pressing surface and the reinforcing bars when the reinforcing bars are pressed.

JP 2013-130017 A

  However, in such a conventional reinforcing bar gripping device, since the back surface of the pressing portion is brought into contact with the tip of the bolt body, the swinging of the pressing member is limited, so that the boundary between the pressing portion of the pressing member and the shaft portion is limited. There is a problem that stress concentration occurs in the portion, and deformation or breakage occurs with use, and sufficient durability cannot be obtained.

  The present invention has been made against the background of the above circumstances, and the object of the present invention is to provide durability of the pressing member in a reinforcing bar gripping device in which the pressing member of the pressing bolt is swingable with respect to the bolt body. Is to improve.

  In order to achieve such an object, the first invention is as follows: (a) In order to grip a reinforcing bar having a large number of nodes spaced apart in the longitudinal direction and provided on the outer peripheral surface from a direction perpendicular to the longitudinal direction; A pressing member provided integrally with a pressing portion provided with a pressing surface pressed by the reinforcing bar and a shaft portion provided with a contact portion having a partial spherical convex surface on a first axis, and the shaft An insertion hole is provided on the second axial center, and the insertion hole has a bolt body provided with an abutment receiving portion on which the abutment portion is slidably contacted. A pressing bolt in which the pressing member is swingably held on the bolt body via the contact portion and the contact receiving portion; and (c) a screw hole into which the pressing bolt is screwed. The bolt screwed portion and the bolt screwed portion to receive the side surface of the reinforcing bar A gripping member integrally provided with a reinforcing bar receiving portion provided to face the pressure bolt, and (d) the pressing bolt and the reinforcing bar receiving portion screwed to the bolt screwing portion. In the reinforcing bar gripping device that clamps and grips the reinforcing bar in between, (e) a columnar convex part protruding in a direction opposite to the pressing part in the first axial direction on the shaft part of the pressing member (F) a fitting hole into which the convex portion is fitted with a predetermined play at the bottom of the insertion hole of the bolt body and the second shaft center. (G) The swinging of the pressing member with respect to the bolt body is restricted by the convex portion being brought into contact with the inner wall surface of the fitting hole.

  According to a second aspect of the present invention, in the reinforcing bar gripping device according to the first aspect, the back surface of the pressing portion is in contact with the tip of the bolt body before and after the convex portion is brought into contact with the inner wall surface of the fitting hole. The swinging of the pressing member is restricted by both of them.

  According to a third aspect of the present invention, in the reinforcing bar gripping device according to the second aspect of the present invention, the swing angle of the first shaft center of the pressing member with respect to the second shaft center of the bolt body is a predetermined angle within a range of 2 ° to 4 °. As described above, the size of the play and the gap between the back surface of the pressing portion and the tip of the bolt body are defined. The swing angle is the maximum angle at which the pressing member can swing.

  According to a fourth aspect of the present invention, in the reinforcing bar gripping device according to any one of the first to third aspects, the contact receiving portion includes a partial spherical concave surface corresponding to the partial spherical convex surface of the contact portion. To do.

  According to a fifth aspect of the present invention, in the reinforcing bar gripping apparatus according to any one of the first to fourth aspects of the invention, (a) the partial spherical convex surface of the contact portion is closer to the opening than the contact receiving portion of the insertion hole. A small-diameter portion having a diameter smaller than the spherical diameter is provided, a female screw is formed in the small-diameter portion, and a male screw that can be screwed into the female screw is formed on the outer peripheral surface of the contact portion. The shaft portion is inserted into the insertion hole while the male screw is screwed into the female screw, and (b) the swing of the pressing member is closer to the pressing portion than the contact portion of the shaft portion. It is characterized in that a neck portion having a smaller diameter than the small diameter portion is provided.

  A sixth aspect of the present invention is the reinforcing bar gripping device according to any one of the first to fourth aspects of the invention, wherein: (a) the partial spherical convex surface of the contact portion is closer to the opening than the contact receiving portion of the insertion hole; A press-fit portion having a diameter smaller than the spherical diameter of the shaft is provided, and the shaft portion is inserted into the insertion hole while elastically expanding the press-fit portion by the abutting portion, (b) A neck portion having a smaller diameter than the press-fitting portion is provided on the side of the pressing portion with respect to the abutting portion of the shaft portion so as to allow the pressing member to swing.

  In such a reinforcing bar gripping device, a cylindrical convex portion is provided concentrically and integrally on the shaft portion of the pressing member, and the convex portion is provided in a fitting hole provided concentrically at the bottom portion of the insertion hole of the bolt body. Stress is concentrated at the boundary between the pressing part and the shaft part of the pressing member because the pressing part is restricted by swinging and being fitted with play, and the convex part is brought into contact with the inner wall surface of the fitting hole. Is eliminated or reduced, and the durability of the pressing member can be improved. In other words, a load is applied to the base portion of the convex portion when the convex portion is brought into contact with the inner wall surface of the fitting hole, but a predetermined durability can be ensured by appropriately setting the diameter dimension of the convex portion. it can.

  In the second invention, the back surface of the pressing portion is brought into contact with the tip of the bolt body before and after the convex portion is brought into contact with the inner wall surface of the fitting hole, and the swinging of the pressing member is restricted by both of them. Therefore, the load applied to the pressing member at the time of swing restriction is dispersed, and it is possible to employ a relatively small-diameter convex portion and fitting hole, and the durability of the pressing member while making the pressing bolt compact. Can be improved.

  In the third invention, the swing angle of the pressing member is determined to be a predetermined angle within the range of 2 ° to 4 °, so that the rebar is properly gripped regardless of protrusions such as nodes by the swing. The durability of the pressing member can be improved while maintaining the gripping performance. In other words, the larger the swing angle, the more properly the rebar can be gripped and the barbing of the rebar due to the sliding of the pressing part can be suppressed, but the load applied to the pressing member when swinging is limited increases and durability is increased. Therefore, the rebar gripping performance and durability can be secured in a well-balanced manner by setting the swing angle within the range of 2 ° to 4 °.

  4th invention is a case where a contact receiving part is provided with the partial spherical concave surface corresponding to the partial spherical convex surface of a contact part, and since both are surface-contacted, a press member is pressed against a reinforcing bar with a heavy load with a press bolt. And a predetermined durability can be ensured regardless of a high load.

  According to the fifth aspect of the present invention, a small-diameter portion is provided on the opening side of the abutting receiving portion of the insertion hole of the bolt body to form a female screw, while a male screw is formed on the outer peripheral surface of the abutting portion of the pressing member. Since the shaft portion of the pressing member is inserted into the insertion hole while the male screw is screwed onto the female screw, the pressing member can be easily assembled to the bolt body so as to be swingable. Further, when the pressing member is replaced due to damage or wear, the pressing member can be easily detached and replaced through screwing of the male screw and the female screw.

  According to a sixth aspect of the present invention, a press-fitting portion having a small diameter is provided on the opening side of the abutting receiving portion of the insertion hole of the bolt body, and the shaft portion of the pressing member elastically expands the press-fitting portion with the abutting portion. However, since it is inserted into the insertion hole, the pressing member can be easily assembled to the bolt body so as to be swingable. Further, when the pressing member is replaced due to damage or wear, the pressing member can be easily detached and replaced by elastically expanding the press-fitting portion by the contact portion.

It is the front view which notched a part which shows the reinforcing bar pressurization apparatus provided with the reinforcing bar holding apparatus which is one Example of this invention. FIG. 2 is a partially cutaway view for specifically explaining the configuration of the reinforcing bar gripping device of FIG. 1, corresponding to a side view seen from the right direction in FIG. 1. It is the side view which notched and showed in part in order to demonstrate the structure of the press volt | bolt with which the reinforcing bar holding | gripping apparatus of FIG. 2 was equipped. It is the side view which notched and showed a part of bolt main body which is a component of the press bolt of FIG. It is a side view of the press member which is a component of the press bolt of FIG. It is the figure which showed the press surface of the press member of FIG. 5, and is the end elevation seen from the right direction in FIG. It is sectional drawing which shows the state by which the press volt | bolt was pressed by the reinforcing bar, and is the top view seen from the VII arrow direction in FIG. It is a figure explaining another aspect of a press volt | bolt, and is a side view corresponding to FIG. It is the side view which notched and showed a part of bolt main body which is a component of the press bolt of FIG. It is a side view of the press member which is a component of the press bolt of FIG.

  The reinforcing bar gripping device of the present invention, for example, abuts a pair of reinforcing bars in the axial direction while abutting the pair of reinforcing bars in the axial direction and pressing them in the axial direction while heating them with a gas burner or the like. However, it can be used in the same manner when the reinforcing bar is gripped from a direction perpendicular to the longitudinal direction. As the contact receiving portion of the bolt body, a partial spherical concave surface corresponding to the partial spherical convex surface of the contact portion is appropriate, but a tapered concave surface or the like on which the contact portion is seated in a linear shape (ring shape) is used. You can also. The partial spherical concave surface is provided with a diameter that is the same as or slightly larger than the spherical diameter of the partial spherical convex surface so that the contact portion is brought into surface contact.

  In the present invention, before and after the convex portion is brought into contact with the inner wall surface of the fitting hole, the back surface of the pressing portion is brought into contact with the tip of the bolt body, and both restrict the swing of the pressing member. However, it is sufficient that the swinging of the pressing member is limited by at least the convex portion being brought into contact with the inner wall surface of the fitting hole. Further, instead of bringing the back surface of the pressing portion into contact with the front end of the bolt body, for example, the shaft portion of the pressing member is brought into contact with the opening peripheral portion of the insertion hole of the bolt body, thereby restricting the swing of the pressing member. Also good. When swinging is restricted by abutting at a plurality of locations, they may be abutted at the same time, but there is no problem even if there is a time shift in consideration of elastic deformation or the like. The rocking angle of the pressing member is suitably in the range of about 2 ° to 4 °, but it can be increased to about 5 ° or 6 ° if necessary, and can be swung over 6 °. May be. The convex portion is, for example, a cylindrical shape with a constant diameter dimension, but may be a tapered shape with the diameter dimension gradually changed. The diameter of the fitting hole can also be changed.

  The pressing member is assembled so as to be swingable to the bolt body through, for example, screwing and press-fitting of a male screw and a female screw. Are possible.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified for explanation, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 shows that when a pair of reinforcing bars 12 and 14 are abutted in the axial direction and pressed by the axial direction while being heated by a gas burner or the like, the pair of reinforcing bars 12 and 14 are abutted in the axial direction to be in a pressurized state. It is a figure explaining the reinforcing bar pressurizing apparatus 10 to hold | maintain, and is the front view which notched and showed a part. Reinforcing bars 12 and 14 are deformed steel bars or the like that are spaced apart in the longitudinal direction and are provided with a large number of nodes 16 (see FIG. 7) and protrusions such as ribs (not shown) on the outer peripheral surface. It hold | maintains in the state in which the one end part mutually faced. A reinforcing bar pressurizing device 10 is fitted with a pressing cylinder 18 for applying pressure in the direction in which the reinforcing bars 12 and 14 are pressed to each other by hydraulic pressure, and a pair that is relatively movable in the axial direction and relatively rotatable about the axis. Large diameter sleeve 22 and small diameter sleeve 24, a reinforcing bar gripping device 26 integrally fixed to the large diameter sleeve 22, a reinforcing bar gripping device 28 fixed to the small diameter sleeve 24, and a large diameter sleeve 22. And a return spring 29 that is accommodated in the housing and urges the pair of reinforcing bars 12 and 14 in a direction to separate them from each other. A connecting socket 30 is integrally fixed to one end of the large-diameter sleeve 22 by screw fastening, and the pressing cylinder 18 can be attached to and detached from an L-shaped notch 31 formed in the connecting socket 30 via a connecting pin or the like. It is attached to. The piston rod 20 of the pressing cylinder 18 is brought into contact with a contact member 21 fixed to the end portion of the small diameter sleeve 24, and the small diameter sleeve 24 is axially moved relative to the large diameter sleeve 22 (FIG. 1). To the left). As a result, the rebar 12 gripped by the reinforcing bar gripping device 26 provided on the large diameter sleeve 22 and the rebar 14 gripped by the reinforcing bar gripping device 28 provided on the small diameter sleeve 24 relatively approach each other. Driven and pressurized in the axial direction.

  Since the reinforcing bar gripping devices 26 and 28 for gripping the reinforcing bars 12 and 14 are configured in substantially the same manner, a small-diameter sleeve is used with reference to FIG. The reinforcing bar gripping device 28 attached to 24 will be specifically described. The reinforcing bar gripping device 28 includes a gripping member 32 integrally provided on the small diameter sleeve 24 so as to extend from the end of the small diameter sleeve 24 in a direction perpendicular to the longitudinal direction thereof, and a screw on the gripping member 32. And a combined pressing bolt 34. The gripping member 32 includes a flat arm portion 36, a bolt screw portion 38 and a reinforcing bar receiving portion 40 branched in a C shape at the tip (one end) of the arm portion 36. A lower end portion (the other end portion) is inserted into the small diameter sleeve 24 from a slit-shaped notch formed in the small diameter sleeve 24 and integrally fixed by welding or the like. A screw hole 42 is provided in the bolt screw portion 38 so as to penetrate in a direction orthogonal to the reinforcing bar 14 to be gripped, that is, in the left-right direction in FIG. 2, and the pressing bolt 34 is screwed into the screw hole 42. By being combined, the reinforcing bar 14 is sandwiched and gripped from the direction perpendicular to the longitudinal direction between the reinforcing bar receiving part 40 provided so as to face the pressing bolt 34. The reinforcing bar receiving portion 40 has a concave or V-shaped reinforcing bar receiving surface, and positions the reinforcing bar 14 at a position where the center line of the pressing bolt 34 and the center line of the reinforcing bar 14 are substantially orthogonal to each other.

  The large diameter sleeve 22 is provided with a notch 43 in the axial direction, and the arm portion 36 of the reinforcing bar gripping device 28 fixed to the small diameter sleeve 24 passes through the notch 43 and protrudes to the outside. The large-diameter sleeve 22 is rotatable around a shaft center within a predetermined angle range. The angular position of the reinforcing bar gripping device 28 around the axis of the large diameter sleeve 22 is positioned substantially concentrically by a pair of position adjusting bolts 46 screwed to both ends of the U-shaped bracket 44. To be adjusted. The rebar gripping device 28 is movable in the axial direction of the small diameter sleeve 24 together with the small diameter sleeve 24, and an angular position around the axis is defined by a pair of position adjusting bolts 46. The bracket 44 is integrally fixed to the outer peripheral side of the large-diameter sleeve 22 by welding or the like so that both ends protrude in the direction of the notch 43. In the other reinforcing bar gripping device 26, a cylindrical portion 48 that is fitted to the outer peripheral side of the large-diameter sleeve 22 and is integrally fixed by welding or the like is provided integrally with the arm portion 36.

  As shown in FIG. 3, the pressing bolt 34 includes a bolt main body 50 and a pressing member 52. 3 is a side view of the pressing bolt 34 with a part cut away, FIG. 4 is a side view of the bolt main body 50 alone, and a part of the pressing bolt 52 is cut away. FIG. It is a side view shown independently. The pressing member 52 includes a columnar pressing portion 54 provided with a pressing surface 54a pressed against the reinforcing bar 14 and a shaft portion 56 provided with a contact portion 56a having a partial spherical convex surface at a first axis. It is provided integrally on a certain center line S1. FIG. 6 is an end view showing the pressing surface 54a of the pressing portion 54. The flat pressing surface 54a, which is flat as a whole, is provided with a large number of quadrangular pyramid-shaped projections 58 at equal density as uneven portions that function as anti-slip. It has been. Instead of the quadrangular pyramid-shaped protrusions 58, various uneven-shaped slip stoppers such as a cone-shaped or prismatic protrusion, or a mesh-shaped notch can be used, and such slip stoppers can be omitted. . A male screw 60 centered on the center line S1 is provided on a part of the contact portion 56a of the shaft portion 56, that is, on the outer peripheral portion centered on the center line S1. The shaft portion 56 is provided with a neck portion 56b having a diameter d2 smaller than the spherical diameter d1 of the partial spherical convex surface of the contact portion 56a between the contact portion 56a and the pressing portion 54, concentrically with the center line S1. In addition, a columnar convex portion 56c having a diameter d3 smaller than the spherical diameter d1 is provided concentrically and integrally on the opposite side of the pressing portion 54 so as to protrude along the center line S1. “O” in FIGS. 3 and 5 is the spherical center of the partial spherical convex surface of the contact portion 56a.

  The bolt body 50 has a male screw portion 62 provided on the outer peripheral surface with a male screw screwed into the screw hole 42, and a hexagonal cross section in which a tool for screwing the male screw portion 62 into the screw hole 42 is locked. Are integrally provided on a center line S2 which is the second axis. An insertion hole 66 into which the shaft portion 56 is inserted is provided on the center line S2 on the end surface in the axial direction on the male screw portion 62 side, and the contact portion 56a can swing in the insertion hole 66. An abutment receiving portion 66a that is slidably contacted is provided. The contact receiving portion 66a is formed with a partial spherical concave surface corresponding to the partial spherical convex surface of the contact portion 56a, and the contact portion 56a is brought into surface contact. The spherical diameter D1 of the partial spherical concave surface of the contact receiving portion 66a is the same as or slightly larger than the spherical diameter d1 of the partial spherical convex surface. Accordingly, the pressing member 52 is held by the bolt body 50 so as to be swingable about the spherical center O of the contact portion 56a via the contact portion 56a and the contact receiving portion 66a. The diameter of the pressing portion 54 of the pressing member 52 is equal to or smaller than the root diameter of the male screw of the male screw portion 62, that is, smaller than the inner diameter of the screw hole 42, and the pressing member 52 is screwed into the screw hole 50 with the pressing member 52 attached to the bolt body 50. The bolt body 50 can be screwed into the screw hole 42 by being inserted into the screw hole 42.

  A small diameter portion 66b having a diameter D2 smaller than the spherical diameter d1 of the contact portion 56a is provided on the opening side of the insertion hole 66 with respect to the contact receiving portion 66a, and the small diameter portion 66b has a valley. A female screw 68 having a diameter equal to or larger than the spherical diameter d1 and capable of screwing the male screw 60 is formed. Thus, the shaft portion 56 of the pressing member 52 is inserted into the insertion hole 66 while the male screw 60 formed on the outer peripheral surface of the contact portion 56 a is screwed with the female screw 68, and the male screw 60 is allowed to penetrate the female screw 68. As a result, the contact portion 56a is seated on the contact receiving portion 66a and held so as to be able to swing, and the removal from the insertion hole 66 is prevented. The diameter D2 of the small diameter portion 66b is sufficiently larger than the diameter d2 of the neck portion 56b, and the pressing member 52 is allowed to swing.

  A fitting hole 66c having a diameter D3 smaller than the spherical diameter D1 of the partial spherical concave surface of the contact receiving portion 66a and larger than the diameter d3 of the convex portion 56c is formed along the center line S2 at the bottom of the insertion hole 66. The protrusion 56c is fitted into the fitting hole 66c. Since D3> d3, a predetermined play e1 (see FIG. 3) is provided between the fitting hole 66c and the convex part 56c, and the swing of the pressing member 52 is allowed by the play e1. The protrusion 56c is brought into contact with the inner wall surface of the fitting hole 66c, thereby restricting the swing over a predetermined swing angle α. The swing angle α is the maximum inclination angle of the center line S1 of the pressing member 52 with respect to the center line S2 of the bolt main body 50. In this embodiment, the swing angle α is a predetermined angle within the range of 2 ° to 4 ° (for example, 3 The size of the play e1 is determined so as to be approximately (°).

  In this embodiment, the back surface 54b of the pressing portion 54 is brought into contact with the tip 50a of the bolt body 50 before and after the projection 56c is brought into contact with the inner wall surface of the fitting hole 66c. In both cases, the swing of the pressing member 52 is restricted. That is, as shown in FIG. 3, in a posture where the center line S <b> 1 of the pressing member 52 coincides with the center line S <b> 2 of the bolt body 50, it is between the back surface 54 b of the pressing portion 54 of the pressing member 52 and the tip 50 a of the bolt body 50. A predetermined gap e2 is provided in the axial direction. The presence of the gap e2 allows the pressing member 52 to swing, and the back surface 54b of the pressing portion 54 is brought into contact with the tip 50a of the bolt body 50. As a result, further oscillation is limited. The size of the gap e2 is determined so that the swing angle at this time is substantially the same as the swing angle α. When the reinforcing member 14 is pressed and gripped by the pressing bolt 34 in a state where the swinging of the pressing member 52 is restricted, the neck portion 56b or the convex portion 56c of the pressing member 52 or the insertion hole 66 of the bolt main body 50 is caused by the reaction force. Since the outer wall portion and the like of the bolt are elastically deformed, the convex portion 56c is brought into contact with the inner wall surface of the fitting hole 66c at least when being pressed, that is, elastically deformed, and the back surface 54b of the pressing portion 54 is the tip 50a of the bolt body 50. It is sufficient that the play e1 and the gap e2 are determined so as to be brought into contact with each other. It is also possible to make the larger amount of elastic deformation at the time of pressing contact first. For example, when the amount of elastic deformation of the neck portion 56b is larger than that of the convex portion 56c, the back surface 54b of the pressing portion 54 is After being brought into contact with the tip 50a of the bolt main body 50, the pressing member 52 is further swung by elastic deformation of the neck portion 56b and the convex portion 56c is brought into contact with the inner wall surface of the fitting hole 66c. The play e1 and the gap e2 can also be determined.

  According to such a reinforcing bar gripping device 28, as shown in FIG. 7, the pressing bolt 34 is screwed into the screw hole 42 of the bolt screwing portion 38, and the pressing portion 54 of the pressing member 52 is connected to the node 16 of the reinforcing bar 14. By being pressed, the reinforcing bar 14 is pinched and gripped with the reinforcing bar receiving part 40. When the small-diameter sleeve 24 is driven in the axial direction relative to the large-diameter sleeve 22 by the hydraulic cylinder 18 and the rebar gripping device 28 is pressed in the direction of the arrow F1 together with the small-diameter sleeve 24, the rebar 14 is applied to the rebar 12. On the other hand, due to the reaction force F2 when being pressed, the pressing member 52 is rotated clockwise around the center O of the sphere so as to rotate in the direction of the reaction force F2 (downward in FIG. 7) relative to the bolt body 50. It can be swung. By swinging the pressing member 52 in this manner, the gripping state of the reinforcing bar 14 is appropriately maintained, and the barbing of the reinforcing bar 14 due to the sliding between the pressing portion 54 and the reinforcing bar 14 is suppressed.

  Here, when the pressing member 52 is swung in this way, the back surface 54b of the pressing portion 54 is brought into contact with the tip 50a of the bolt body 50, so that further swinging of the pressing member 52 is restricted. Therefore, a load is applied to the neck portion 56 b that is a boundary portion between the pressing portion 54 and the shaft portion 56 due to the contact. In this case, in the present embodiment, a columnar convex portion 56 c is provided concentrically and integrally on the shaft portion 56 of the pressing member 52, and a fitting hole provided concentrically on the bottom of the insertion hole 66 of the bolt body 50. Since the protrusion 56c is fitted into the inner wall 66c with play e1, and the protrusion 56c is brought into contact with the inner wall surface of the fitting hole 66c, the pressing member 52 is restricted from swinging. The load applied to the neck portion 56b is reduced, and the durability of the pressing member 52 can be improved. That is, a load is applied to the root portion of the convex portion 56c when the convex portion 56c is brought into contact with the inner wall surface of the fitting hole 66c, but a predetermined durability is obtained by appropriately setting the diameter of the convex portion 56c. Can be secured.

  Further, the back surface 54b of the pressing portion 54 is brought into contact with the tip 50a of the bolt body 50 before and after the convex portion 56c is brought into contact with the inner wall surface of the fitting hole 66c. Since the swinging is restricted, the load applied to the pressing member 52 when the swinging is restricted is dispersed, and it is possible to employ the relatively small diameter convex portion 56c and the fitting hole 66c, and the pressing bolt 34 can be made compact. The durability of the pressing member 52 can be improved while being configured.

  Further, since the swinging angle α of the pressing member 52 is determined to be a predetermined angle within the range of 2 ° to 4 °, the swinging of the reinforcing bar 14 can be appropriately performed regardless of the protrusions such as the nodes 16. The durability of the pressing member 52 can be improved while maintaining the gripping performance that can be gripped. That is, as the swing angle α is larger, the rebar 14 can be properly gripped and the barbing of the rebar 14 due to the sliding of the pressing portion 54 can be suppressed. However, the load applied to the pressing member 52 when the swing is limited is larger. Since the durability is impaired, the gripping performance and the durability of the reinforcing bar 14 can be secured in a well-balanced manner by setting the swing angle α within the range of 2 ° to 4 °.

  Further, the contact receiving portion 66a has a partial spherical concave surface corresponding to the partial spherical convex surface of the contact portion 56a, and both are brought into surface contact, so that the pressing member 52 is pressed against the reinforcing bar 14 with a high load by the pressing bolt 34. And a predetermined durability can be ensured regardless of a high load.

  Further, a small diameter portion 66b is provided on the opening side of the contact receiving portion 66a of the insertion hole 66 of the bolt main body 50 and a female screw 68 is formed, while the outer peripheral surface of the contact portion 56a of the pressing member 52 is formed. Since the male screw 60 is formed and the shaft portion 56 of the pressing member 52 is inserted into the insertion hole 66 while the male screw 60 is screwed into the female screw 68, the pressing member 52 can be easily swung with respect to the bolt body 50. Can be assembled. In addition, when the pressing member 52 is replaced due to damage or wear, the pressing member 52 can be easily detached and replaced through screwing of the male screw 60 and the female screw 68.

  Next, another embodiment of the present invention will be described. In the following embodiments, parts that are substantially the same as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 8 is a side view corresponding to FIG. 3, illustrating another aspect of the pressing bolt. The pressing bolt 80 includes a bolt body 82 and a pressing member 84. FIG. 9 is a side view showing the bolt main body 82 alone with a part cut away, and FIG. 10 is a side view showing the pressing member 84 alone. The pressing member 84 integrally includes a pressing portion 54 provided with a pressing surface 54a and a shaft portion 56 having a contact portion 56a, a neck portion 56b, and a convex portion 56c on the center line S1. The contact portion 56a has a spherical shape over the entire area, and is different from the above embodiment in that the male screw 60 is not present. The bolt main body 82 is integrally provided with a male screw portion 62 and a tool locking portion 64 on the center line S2, and an insertion hole 66 is provided on the center line S2 on the end surface in the axial direction on the male screw portion 62 side. The insertion hole 66 is provided with an abutment receiving portion 66a and a fitting hole 66c. However, the insertion hole 66 is provided with a press-fit portion 66d instead of the small diameter portion 66b where the female screw 68 is provided. Different from the example. The press-fit portion 66d is provided with a diameter D4 smaller than the spherical diameter d1 of the contact portion 56a of the pressing member 84, and the shaft portion 56 of the press member 84 elastically moves the press-fit portion 66d with the contact portion 56a. The contact portion 56a is seated on the contact receiving portion 66a and held swingably by being inserted into the insertion hole 66 while being expanded in diameter, and the contact portion 56a passing through the press-fit portion 66d. The slipping out of the insertion hole 66 is prevented. The diameter D4 of the press-fit portion 66d is slightly smaller than the spherical diameter d1 and larger than the diameter D2 so that the contact portion 56a can be press-fitted. Thus, since the diameter D4 of the press-fit portion 66d is larger than the diameter D2, the diameter d4 of the neck portion 56b of the pressing member 84 is also made larger than the diameter d2 within a range in which the pressing member 84 can swing to the swing angle α. ing.

  Also in this embodiment, the back surface 54b of the pressing portion 54 is brought into contact with the tip 82a of the bolt body 82 before and after the projection 56c is brought into contact with the inner wall surface of the fitting hole 66c. Since the swinging of the pressing member 84 is limited by the swinging angle α, the same effect as the above embodiment can be obtained. In this case, since the diameter d4 of the neck portion 56b of the pressing member 84 is larger than the diameter d2, the strength of the neck portion 56b is increased and the durability is further improved.

  Further, a press-fit portion 66d having a small diameter is provided on the opening side of the contact receiving portion 66a of the insertion hole 66 of the bolt main body 82, and the shaft portion 56 of the pressing member 84 elastically presses the press-fit portion 66d with the contact portion 56a. Therefore, the pressing member 84 can be easily assembled to the bolt body 82 so as to be swingable. Further, when the pressing member 84 is replaced due to damage, wear, or the like, it can be easily detached and replaced by elastically expanding the press-fit portion 66d by the contact portion 56a.

  As mentioned above, although the Example of this invention was described in detail based on drawing, these are one Embodiment to the last, This invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

  12, 14: Reinforcing bars 16: Nodes 26, 28: Reinforcing bar gripping device 32: Holding member 34, 80: Pressing bolt 38: Bolt screwing part 40: Reinforcing bar receiving part 42: Screw hole 50, 82: Bolt body 50a, 82a: Tip 52, 84: Pressing member 54: Pressing part 54a: Pressing surface 54b: Back face 56: Shaft part 56a: Abutting part 56b: Neck part 56c: Convex part 60: Male screw 66: Insertion hole 66a: Contact receiving part 66b: Small diameter Part 66c: Fitting hole 66d: Press-fit part 68: Female screw S1: Center line (first axis) S2: Center line (second axis) e1: Play α: Swing angle

Claims (6)

In order to grip a reinforcing bar that is spaced apart in the longitudinal direction and has a large number of nodes on the outer peripheral surface from a direction perpendicular to the longitudinal direction,
A pressing member provided integrally with a pressing portion provided with a pressing surface pressed by the reinforcing bar and a shaft portion provided with a contact portion having a partial spherical convex surface on a first axis, and the shaft An insertion hole into which the contact portion is inserted is provided on the second axis, and the insertion hole has a bolt body provided with a contact receiving portion on which the contact portion is slidably contacted. And a pressing bolt in which the pressing member is swingably held by the bolt body via the contact portion and the contact receiving portion;
A bolt screwing portion provided with a screw hole into which the pressing bolt is screwed, and a reinforcing bar provided to face the pressing bolt screwed into the bolt screwing portion in order to receive a side surface of the reinforcing bar. A gripping member integrally provided with a receiving portion;
In a reinforcing bar gripping device that grips and holds the reinforcing bar between the pressing bolt screwed into the bolted screw part and the reinforcing bar receiving part,
On the shaft portion of the pressing member, a cylindrical convex portion protruding in the opposite direction to the pressing portion in the first axial direction is provided concentrically and integrally,
At the bottom of the insertion hole of the bolt body, a fitting hole into which the convex portion is fitted with a predetermined play is provided concentrically with the second axis,
The reinforcing bar gripping device is characterized in that swinging of the pressing member with respect to the bolt main body is restricted by the convex portion being brought into contact with the inner wall surface of the fitting hole. Before and after the convex portion is brought into contact with the inner wall surface of the fitting hole, the back surface of the pressing portion is brought into contact with the tip of the bolt body, and the swinging of the pressing member is restricted by both of them. The reinforcing bar gripping device according to claim 1, wherein: The size of the play and the pressure of the pressing portion are such that the swing angle of the first axis of the pressing member with respect to the second axis of the bolt body is a predetermined angle within a range of 2 ° to 4 °. The rebar gripping device according to claim 2, wherein a gap between a back surface and a tip of the bolt body is defined. The reinforcing bar gripping device according to any one of claims 1 to 3, wherein the contact receiving portion includes a partial spherical concave surface corresponding to the partial spherical convex surface of the contact portion. A small diameter portion having a diameter smaller than the spherical diameter of the partial spherical convex surface of the contact portion is provided on the opening side of the insertion hole from the contact receiving portion, and a female screw is formed in the small diameter portion. In addition, a male screw that can be screwed into the female screw is formed on the outer peripheral surface of the contact portion, and the shaft portion is inserted into the insertion hole while screwing the male screw into the female screw,
The neck portion having a smaller diameter than the small-diameter portion is provided on the pressing portion side of the shaft portion so as to allow the pressing member to swing. 5. The reinforcing bar gripping device according to any one of 4 above. A press-fit portion having a diameter smaller than the spherical diameter of the partial spherical convex surface of the contact portion is provided on the opening side of the insertion hole from the contact receiving portion, and the shaft portion is the contact portion. While being inserted into the insertion hole while elastically expanding the press-fitting portion by the portion,
The neck portion having a smaller diameter than the press-fit portion is provided on the pressing portion side of the shaft portion so as to allow the pressing member to swing. 5. The reinforcing bar gripping device according to any one of 4 above.

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