JP5800704B2 - Rebar fixing device - Google Patents

Description

  The present invention relates to a reinforcing bar fixing device, and more particularly to a technique for suppressing scratches generated in a reinforcing bar by sliding of the reinforcing bar fixed to the reinforcing bar fixing device.

  For example, as shown in Patent Documents 1 and 2, (a) a tightening bolt for tightening a reinforcing bar having a plurality of nodes on the outer peripheral surface having a constant interval in the longitudinal direction from a direction perpendicular to the longitudinal direction; There is a reinforcing bar fixing device that has a reinforcing bar receiving surface facing the clamping bolt to receive the side of the reinforcing bar, and (c) a reinforcing bar fixing device of the type that fixes the reinforcing bar between the reinforcing bar receiving surface and the clamping bolt. It has been.

  For example, as shown in Patent Document 1, the reinforcing bar fixing device as described above is pressed by, for example, a pressing cylinder until a large-diameter bulging portion is formed in a state where the ends of a pair of reinforcing bars are red-heated using a gas burner. Thus, when performing gas pressure welding to be joined, each end of the pair of reinforcing bars or both ends of one annular reinforcing bar (hoop) are fixed in a state of abutting each other. The tightening bolt is provided with a pressing member having a pressing surface for pressing the reinforcing bar, and the pressing surface is pressed against the reinforcing bar by tightening the tightening bolt. To fix the reinforcing bar.

Japanese Patent No. 3498046 Japanese Patent No. 2576051

  By the way, in the reinforcing bar fixing device as described above, the tightening force of the tightening bolt may not be sufficient due to, for example, insufficient output torque of the rechargeable impact wrench. In such a case, when the pair of reinforcing bars are pressed against each other by the pressing cylinder, the reinforcing bars slip between the pressing member provided at the tip of the tightening bolt at the place where the tightening bolt is tightened. There was a problem that the surface of the reinforcing bar was damaged.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a reinforcing bar fixing device that suppresses the generation of scratches on reinforcing bars due to sliding with a fastening bolt.

  To achieve this object, the gist of the present invention is: (a) Tightening for tightening a reinforcing bar having a plurality of nodes on the outer peripheral surface having a constant interval in the longitudinal direction from a direction perpendicular to the longitudinal direction. A bolt and (b) a reinforcing bar receiving surface facing the clamping bolt to receive the side of the reinforcing bar, and (c) a type of fixing the reinforcing bar between the reinforcing bar receiving surface and the clamping bolt. In the reinforcing bar fixing device, (d) the fastening bolt includes a pressing member having a pressing portion on which a pressing surface for pressing the reinforcing bar is formed, and another portion following the pressing portion of the pressing member around the axis. (E) the fitting hole includes a female screw formed on the inner peripheral surface of the fitting hole, and a screw hole formed therein. Formed on the bottom inner peripheral surface of the fitting hole at a predetermined distance from the female thread, (F) the pressing member is formed adjacent to the pressing portion, and has a neck portion having a diameter smaller than the inner diameter of the female screw, and a neck portion thereof. A male end threaded on the outer peripheral surface, and a base end portion formed on an end surface of the contact surface capable of contacting the receiving surface. The male screw formed in the base end part has passed the said female screw in the position contact | abutted to the surface, It is characterized by the above-mentioned.

  According to the reinforcing bar fixing device of the present invention, the tightening bolt has a pressing member having a pressing part on which a pressing surface for pressing the reinforcing bar is formed, and another part following the pressing part of the pressing member. A bolt body having a fitting hole to be fitted around the center so as to be relatively rotatable, and the fitting hole includes a female screw formed on the inner peripheral surface on the opening side of the fitting hole, and the fitting A receiving surface formed on a bottom-side inner peripheral surface spaced from the female screw of the joint hole by a predetermined distance and receiving the base end portion of the pressing member in a swingable manner, and the pressing member is adjacent to the pressing portion A neck portion having a diameter smaller than the inner diameter of the female screw, a male screw that can be screwed into the female screw, is formed on the outer peripheral surface, and a contact surface that can come into contact with the receiving surface is an end surface. In a position where the contact surface is in contact with the receiving surface, Formed male screw is passed through the internal thread on the proximal end. For this reason, in the reinforcing bar fixing device, even if the reinforcing member slips between the pressing surface of the pressing member at the portion pressed by the fastening bolt of the reinforcing bar, the pressing member swings. Thus, slipping between the pressing surface and the reinforcing bar is prevented, so that it is possible to suppress generation of scratches on the reinforcing bar due to the pressing surface of the tightening bolt. Further, when the pressing member tries to drop off from the bolt main body when not pressed, the base end portion of the pressing member comes into contact with the female screw of the fitting hole, and the pressing member is prevented from falling off.

  Here, preferably, (a) the contact surface formed at the base end of the pressing member is formed as a partially spherical convex surface, and (b) on the bottom inner peripheral surface of the fitting hole of the bolt body. The formed receiving surface is formed as a partially spherical concave surface that comes into surface contact with the contact surface. For this reason, since the contact surface and the receiving surface are in surface contact with each other, the tightening bolt can press the pressing member against the reinforcing bar with a high load, and wear between the contact surface and the receiving surface. Is suitably suppressed.

It is the front view which notched a part which shows the reinforcing bar holding | maintenance apparatus provided with the reinforcing bar fixing apparatus of one Example of this invention. FIG. 2 is a side view of FIG. 1 shown with a part cut away in order to explain the configuration of the reinforcing bar fixing device of FIG. 1. It is a figure explaining the structure of the clamping bolt with which the reinforcing bar fixing apparatus of FIG. 2 was equipped, and is a III-III sectional view taken on the line of FIG. It is an enlarged view which expands and shows the front-end | tip part of the clamping bolt of FIG. It is the figure which looked at the fastening bolt of Drawing 3 from the arrow V direction. It is the figure which looked at the reinforcing bar fixing device of FIG. 2 from the arrow VI direction. It is a figure which shows the reinforcing bar fixing apparatus of the other Example of this invention, and is a figure corresponding to FIG. FIG. 8 is a diagram illustrating a state of a pressing member of the tightening bolt when the tightening bolt is pressed against a rebar having distortion by tightening the tightening bolt in the reinforcing bar fixing device of FIG. 7.

  Hereinafter, a reinforcing member holding apparatus for gas pressure welding provided with a reinforcing bar fixing device according to an embodiment of the present invention will be described with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified for easy understanding, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 shows that a pair of reinforcing bars 12a and 12b are aligned with each other in the axial direction and end surfaces of each of the reinforcing bars 12a and 12b protrude from each other in order to gas-weld the reinforcing bars 12a and 12b whose one ends are cut at right angles to the axis. The reinforcing bar holding device 14 which holds in a combined state is shown. The reinforcing bar holding device 14 is fitted to a pressing cylinder 16 for applying pressure to the reinforcing bars 12a and 12b by hydraulic pressure so as to be relatively movable in the axial direction and relatively rotatable around the axial center. A large-diameter sleeve 22 and a small-diameter sleeve 24 that are tubular members, a reinforcing bar fixing device 26 fixed integrally with the large-diameter sleeve 22, a reinforcing bar fixing device 28 fixed integrally with the small-diameter sleeve 24, and a large A return spring 30 housed in the diameter sleeve 22 and energizing the pair of reinforcing bars 12a and 12b in a direction away from each other, and is attachable to and detachable from an L-shaped notch 31 formed at one end of the large diameter sleeve 22. The piston rod of the attached pressing cylinder 16 drives the small diameter sleeve 24.

  Since the reinforcing bar fixing devices 26 and 28 for fixing the reinforcing bars 12b and 12a are configured in the same manner, they are fixed to the small diameter sleeve 24 using FIG. 2 in which the right side surface of FIG. 1 is partially cut away. The reinforcing bar fixing device 28 will be described. The reinforcing bar fixing device 28 includes an arm portion 32 extending from the end portion of the small-diameter sleeve 24 in a direction orthogonal to the longitudinal direction, a pair of first gripping portions 34 branched in a C shape at the tip of the arm portion 32, and A second grip 36 and a fastening bolt 38 screwed into one first grip 34 are provided. Between the first gripping portion 34 and the second gripping portion 36, the reinforcing bar 12 a has a tightening bolt 38 that presses from a direction perpendicular to the longitudinal direction thereof, and a second gripping portion that faces the tightening bolt 38. 36 is sandwiched between a concave or V-shaped receiving surface (reinforcing bar receiving surface) 40 for receiving a side surface of the reinforcing bar 12a opposite to the fastening bolt 38.

  A cutout 42 is formed in the large diameter sleeve 22, and a reinforcing bar fixing device 28 fixed to the small diameter sleeve 24 protrudes outside through the cutout 42 and can be rotated within a predetermined angle range. Has been. The angular position of the reinforcing bar fixing device 28 is set so that the reinforcing bars 12a and 12b are positioned substantially concentrically by a pair of position adjusting bolts 46 screwed into both ends of a C-shaped ring member 44 having a notch. It has come to be adjusted.

  As shown in FIG. 3, the fastening bolt 38 includes a pressing member 50 having a cylindrical pressing portion 50 b on which a pressing surface 50 a for pressing the outer peripheral surface of the reinforcing bar 12 a is formed, and a pressing portion of the pressing member 50. A substantially cylindrical bolt body 52 having a fitting hole 52a into which the other part following 50b is fitted so as to be relatively rotatable around the axis C1 is provided. The bolt main body 52 is formed with a male screw 52c, and the base end portion of the bolt main body 52 is formed with a head portion 52b having a regular hexagonal cross section.

  As shown in FIGS. 3 and 4, the fitting hole 52a of the bolt main body 52 is formed on the inner peripheral surface of the opening and the inner peripheral surface of the bottom side separated by a predetermined distance from the inner screw 52d. And the receiving surface 52e which receives the other part following the said press part 50b of the press member 50 so that rocking | fluctuation is possible. The other part following the pressing part 50b is formed in a cylindrical shape adjacent to the pressing part 50b, and is adjacent to the inner diameter A of the female screw 52d and the neck part 50c, and can be screwed into the female screw 52d. A male male thread 50d is formed on the outer peripheral surface, and a partial spherical contact surface 50e capable of contacting the receiving surface 52e in a surface contact state is formed by a base end portion 50f formed on the end surface.

  As shown in FIG. 4, the base end part 50f is formed in a partial spherical shape, and the contact surface 50e is formed in a partial spherical convex surface. The receiving surface 52e of the fitting hole 52a is formed as a partially spherical concave surface that comes into surface contact with the contact surface 50e. In the state where the contact surface 50e is in contact with the receiving surface 52e, the male screw 50d formed on the base end portion 50f passes through the female screw 52d.

  Further, as shown in FIG. 4, in a state where the contact surface 50e is in contact with the receiving surface 52e, the surface 50g opposite to the pressing surface 50a of the pressing portion 50b and the front end surface 52f of the bolt body 52 are interposed. A gap a in the axial direction is formed, and a radial gap b is formed between the neck 50c and the female screw 52d of the fitting hole 52a. For this reason, the base end portion 50f of the pressing member 50 is capable of relative rotation about the axis C1 of the bolt main body 52 and can swing until the surface 50g of the pressing portion 50b contacts the front end surface 52f of the bolt main body 52. Is fitted into the fitting hole 52a. In addition, the dashed-dotted line pressing member 50 shown in FIG. 4 virtually shows an inclined state in which the base end portion 50f swings and the axis C2 is inclined with respect to the axis C1 of the bolt body.

  3 and 4, when the base end portion 50f of the pressing member 50 is fitted into the fitting hole 52a, the male screw 50d of the base end portion 50f is screwed into the female screw 52d of the fitting hole 52a. Then, the internal thread 52d is passed by rotating the base end portion 50f. Thus, when the pressing member 50 is not pressed against the reinforcing bar 12a, the base end portion 50f abuts on the female screw 52d when the pressing member 50 tries to drop off from the bolt main body 52, thereby preventing the pressing member 50 from dropping off from the bolt main body 52. Further, when the pressing member 50 is removed from the bolt body 52, the male screw 50d of the base end portion 50f is screwed into the female screw 52d and the female screw 52d is allowed to pass therethrough.

  As shown in FIG. 5, the pressing surface 50 a of the pressing member 50 is circular, and a plurality of small protrusions 54 that are quadrangular pyramid (pyramid) irregularities having the same shape are arranged on the pressing surface 50 a with equal density. Has been.

  According to the reinforcing bar fixing device 28 configured as described above, as shown in FIG. 6, when the fastening bolt 38 is tightened, the pressing surface 50a of the pressing member 50 has a constant interval in the longitudinal direction of the reinforcing bar 12a. The reinforcing bar 12a is fixed by being pressed against the outer peripheral surface of one of the plurality of nodes 12c. When the small diameter sleeve 24 is driven by the hydraulic cylinder 16, the pressing member 50 swings in the arrow F2 direction by a reaction force that presses the reinforcing bar 12a in the arrow F1 direction. For this reason, the tightening point where the reinforcing bar 12a is pressed by the small protrusion 54 formed on the pressing surface 50a is not shifted while the movement of the tightening bolt 38 in the direction of the arrow F1 is allowed.

  According to the reinforcing bar fixing device 28 of the present embodiment, the fastening bolt 38 includes the pressing member 50 having the pressing portion 50b formed with the pressing surface 50a for pressing the reinforcing bar 12a, and the pressing portion 50b of the pressing member 50. And a bolt body 52 having a fitting hole 52a in which the other portion following the shaft center C1 is fitted so as to be relatively rotatable around the axis C1, and the fitting hole 52a is formed in the opening side of the fitting hole 52a. A female screw 52d formed on the peripheral surface and a receiving surface that is formed on the bottom inner peripheral surface of the fitting hole 52a at a predetermined distance from the female screw 52d and receives the base end portion 50f of the pressing member 50 in a swingable manner. The pressing member 50 is formed adjacent to the pressing portion 50b, and has a neck portion 50c having a smaller diameter than the inner diameter A of the female screw 52d, and a male screw 50d that is adjacent to the neck portion 50c and can be screwed into the female screw 52d. Formed on the outer peripheral surface Further, a contact surface 50e that can contact the receiving surface 52e has a base end portion 50f formed on the end surface, and at the position where the contact surface 50e contacts the receiving surface 52e, the base end portion 50f. The male screw 50d formed in the above passes through the female screw 52d. For this reason, in the reinforcing bar fixing device 28, the pressing member 50 swings even if the reinforcing bar 12a slips between the pressing surface 50a of the pressing member 50 at the portion pressed by the tightening bolt 38 of the reinforcing bar 12a. As a result, slippage between the pressing surface 50a and the reinforcing bar 12a is prevented, so that the occurrence of scratches on the reinforcing bar 12a by the pressing surface 50a of the tightening bolt 38 can be suppressed. Further, when the pressing member 50 tries to drop off from the bolt main body 52 at the time of non-pressing, the base end portion 50f of the pressing member 50 comes into contact with the female screw 52d of the fitting hole 52a, and the pressing member 50 is prevented from dropping off.

  Further, according to the reinforcing bar fixing device 28 of the present embodiment, the contact surface 50e formed at the base end portion 50f of the pressing member 50 is formed as a partially spherical convex surface, and the bottom side of the fitting hole 52a of the bolt main body 52. The receiving surface 52e formed on the inner peripheral surface is formed as a partially spherical concave surface that comes into surface contact with the contact surface 50e. For this reason, since the contact surface 50e and the receiving surface 52e are in surface contact, the fastening bolt 38 can press the pressing member 50 against the reinforcing bar 12a with a high load, and the contact surface 50e and the receiving surface 52e Is suitably suppressed.

  Further, according to the reinforcing bar fixing device 28 of the present embodiment, the tightening bolt 38 has a structure composed of two parts, that is, the pressing member 50 and the bolt main body 52, so that the number of parts of the reinforcing bar fixing device 28 is suitably reduced. Can do.

  Next, another embodiment of the present invention will be described. In the following description, portions common to the embodiments are denoted by the same reference numerals and description thereof is omitted.

  The reinforcing bar fixing device 56 according to the present embodiment is different from the above-described reinforcing bar fixing device 28 according to the first embodiment in that a reinforcing bar 58 that is distorted in an arc shape is fixed. Has been.

  As shown in FIG. 7, when the fastening bolt 38 is tightened, the pressing surface 50 a of the pressing member 50 is pressed against the outer peripheral surface of the node 58 a of the reinforcing bar 58 and the reinforcing bar 58 is fixed. 8, when the pressing surface 50a of the pressing member 50 is pressed against the outer peripheral surface of the node 58a of the reinforcing bar 58, the pressing surface 50a is pressed so as to be substantially parallel to the outer peripheral surface of the node 58a. The member 50 swings.

  According to the reinforcing bar fixing device 56 configured as described above, when the fastening bolt 38 is tightened, the pressing member 50 swings, so that the distortion of the reinforcing bar 58 is slightly deformed. The outer peripheral surface and the pressing surface 50a of the pressing member 50 are substantially parallel. For this reason, the tightening bolt 38 can suitably tighten the reinforcing bar 58 having distortion as compared with the conventional tightening bolt in which the pressing member 50 does not swing.

  As mentioned above, although one Example of this invention was described in detail with reference to drawings, this invention is implemented also in another aspect.

  In the reinforcing bar fixing devices 28 and 56 of the present embodiment, the receiving surface 52e of the fitting hole 52a is formed as a partially spherical concave surface that comes into surface contact with the contact surface 50e, but, for example, makes line contact with the contact surface 50e. It may be a tapered surface with a taper shape.

  Further, in the reinforcing bar fixing devices 28 and 56 of the present embodiment, a large number of quadrangular pyramid-shaped small protrusions 54 are formed on the pressing surface 50a of the pressing member 50, but conical small protrusions and prismatic small protrusions are formed. Other irregularities such as projections, irregularities formed by a plurality of parallel ridges connected in one direction, and irregularities formed by forming a plurality of independent concave holes may be used.

  Further, the reinforcing bar fixing devices 28 and 56 of this embodiment are used in the reinforcing bar holding device 14 for gas-welding the butted ends of the pair of reinforcing bars 12a and 12b to each other. May be provided.

  Although not illustrated one by one, the present invention can be implemented in variously modified and improved modes based on the knowledge of those skilled in the art.

12a, 12b, 58: Reinforcing bar 12c, 58a: Node 26, 28: Rebar fixing device 38: Tightening bolt 40: Receiving surface (reinforcing bar receiving surface)
50: Pressing member 50a: Pressing surface 50b: Pressing portion 50c: Neck portion 50d: Male screw 50e: Contact surface 50f: Base end portion 52: Bolt main body 52a: Fitting hole 52d: Female screw 52e: Receiving surface

Claims (2)

A tightening bolt for tightening a reinforcing bar having a plurality of nodes on the outer peripheral surface thereof having a constant interval in the longitudinal direction from a direction perpendicular to the longitudinal direction, and a reinforcing bar facing the tightening bolt for receiving a side surface of the reinforcing bar A reinforcing bar fixing device of a type that includes a receiving surface, and that fixes the reinforcing bar between the reinforcing bar receiving surface and a fastening bolt;
The fastening bolt is a fitting that fits a pressing member having a pressing part formed with a pressing surface for pressing the reinforcing bar, and another part following the pressing part of the pressing member so as to be relatively rotatable around an axis. Including a bolt body having a joint hole formed at the tip,
The fitting hole is formed in a female screw formed on the inner peripheral surface of the opening side of the fitting hole, and in a bottom inner peripheral surface spaced a predetermined distance from the female screw of the fitting hole. And a receiving surface that receives the end in a swingable manner,
The pressing member is formed adjacent to the pressing portion, a neck portion having a diameter smaller than an inner diameter of the female screw, a male screw adjacent to the neck portion and screwable to the female screw is formed on the outer peripheral surface, and the receiving surface And a base end portion formed on an end surface of the contact surface. The male screw formed on the base end portion passes through the female screw at a position where the corresponding contact surface contacts the receiving surface. Reinforcing bar fixing device. The contact surface formed at the base end of the pressing member is formed as a partially spherical convex surface,
The reinforcing bar fixing device according to claim 1, wherein a receiving surface formed on a bottom-side inner peripheral surface of the fitting hole of the bolt body is formed as a partially spherical concave surface that is in surface contact with the contact surface.

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