JP4580961B2 - Rebar fixing device - Google Patents

Description

  The present invention relates to a reinforcing bar fixing device for fixing a reinforcing bar.

  For example, there has been proposed a device for fixing a metal rebar such as a rebar embedded in concrete when constructing reinforced concrete. For example, a reinforcing bar material gripping device described in Patent Document 1 is the same. According to such a fixing device, gas pressure welding is performed by pressing the end portions of the pair of reinforcing bars that are abutted against each other until the large-diameter bulging portion is formed in a red-hot state and maintaining this state for joining. In order to do so, the ends of the pair of reinforcing bars are fixed in a state where they abut each other.

  The conventional rebar fixing device as described above includes a tightening bolt for tightening from a direction perpendicular to the longitudinal direction of the rebar, and a rebar receiving surface facing the tightening bolt to receive a side surface of the rebar, There are many types in which the reinforcing bar is strongly fixed between the receiving surface and the fastening bolt by rotating the fastening bolt using an impact wrench.

  In general, the above-mentioned reinforcing bar is a soft steel material, for example, D6 to D51, which is referred to as a deformed steel bar in the JIS standard and is denoted by D indicating Deformed, and is a rib extending in the longitudinal direction. In general, a plurality of protrusions such as nodes extending in the circumferential direction are formed. However, the location where the tip of the tightening bolt is brought into contact is not constant among the ribs of the reinforcing bars, the joints, and the outer peripheral surface between them. When tightened strongly, a concave-shaped flaw is generated on the outer peripheral surface between the ribs and nodes of the reinforcing bar, and the tensile load of the reinforcing bar may be impaired.

On the other hand, as described in Patent Document 2, a pressing member is provided at the tip of the tightening bolt so as to be rotatable about the axis, and the diameter of the pressing member is set to be larger than the average interval of the reinforcing bar nodes. Larger rebar fixing devices have been proposed. According to this, since the nodes of the reinforcing bars are pressed, there is an advantage that the outer peripheral surface between the ribs and the nodes of the reinforcing bars is not damaged.
Japanese Patent No. 2576051 Japanese Patent No. 3498046

  By the way, in the rebar fixing device as described above, the pressing member provided at the tip of the tightening bolt is set smaller than the diameter of the tightening bolt, and when the tightening bolt is tightened, the rebar is stable. When tightened, it requires a large tightening torque, deepens the scratches formed when tightening, forms scratches on the outer peripheral surface regardless of the presence of nodes, and damages the tensile load of the reinforcing bars There was a case.

  The present invention has been made against the background of the above circumstances, and the object of the present invention is that it can be stably fixed even if the tightening torque for fixing the reinforcing bar is relatively small. An object of the present invention is to provide a reinforcing bar fixing device in which the tensile load of the reinforcing bar is not impaired due to the tightening of the tightening bolt.

In order to achieve such an object, the gist of the invention according to claim 1 is that (a) a reinforcing bar having a plurality of nodes on the outer peripheral surface having a constant interval in the longitudinal direction is formed from a direction perpendicular to the longitudinal direction. A tightening member for tightening, a threaded portion into which the tightening member is screwed, a reinforcing bar receiving portion facing the screwed portion to receive the side surface of the reinforcing bar, and the screwed portion and the reinforcing bar receiving portion are integrated. A rebar fixing device of a type that removably fixes the reinforcing bar between a fastening member screwed into the screwing part and a receiving surface of the reinforcing bar receiving part. (B) the tightening member comprises (b-1) a bolt body in which a male screw is formed, and (b-2) a plate shape having a longitudinal dimension larger than the diameter of the bolt body, the longitudinal direction being A pusher provided at the front end of the bolt body so as to be relatively rotatable about the axis of the bolt body so as to extend along the longitudinal direction of the reinforcing bar. A member, seen including, (c) the pressing member is that both end portions in the longitudinal direction is a curved shape so as to approach to the reinforcing bar side.

  Further, the gist of the invention according to claim 2 is that, in the invention of claim 1, (c) the bolt body includes a fitting hole and an annular sliding contact surface formed on an outer peripheral edge of the fitting hole. (D) the pressing member protrudes from a pressing surface on which a plurality of irregularities are formed, and a surface opposite to the pressing surface, and the surface is in sliding contact with the annular sliding contact surface. And a shaft portion that is fitted in the fitting hole in a state where the fitting is performed.

  Further, the gist of the invention according to claim 3 is that, in the invention of claim 1 or 2, (e) a plurality of protrusions on the pressing surface of the pressing member are averages of nodes in the longitudinal direction of the reinforcing bar. It exists in the longitudinal direction at intervals smaller than the intervals.

  The gist of the invention according to claim 4 is that, in the invention of any one of claims 1 to 3, the longitudinal dimension of the pressing member is at least three times the average interval of nodes in the longitudinal direction of the reinforcing bar. It is to be.

  A gist of the invention according to claim 5 is that, in the invention according to any one of claims 2 to 4, the pressing member is provided on at least one of the pair of side edges parallel to the longitudinal direction in the thickness direction. In this case, an inclined end surface is formed toward the connecting portion as it goes toward the pressing surface.

A gist of the invention according to claim 6 is that, in the invention of any one of claims 1 to 5 , the pressing surface has a concave shape in a cross section perpendicular to the longitudinal direction of the pressing member. There is to be.

A gist of the invention according to claim 7 is that, in the invention according to any one of claims 1 to 6 , the reinforcing bar fixing device is a pair of fittings that are slidably fitted to each other in the axial direction. It exists in a joint member, and it exists in holding a pair of reinforcing bars in the state in which the edge part mutually faced.

According to the reinforcing bar fixing device of the first aspect of the present invention, the tightening member has a bolt body formed with a male screw and a plate shape having a longitudinal dimension larger than the diameter of the bolt body, and the longitudinal direction is the Since the front end portion of the bolt body includes a pressing member provided so as to be relatively rotatable around the axis of the bolt body so as to be along the longitudinal direction of the reinforcing bar, the pressing area of the pressing member against the reinforcing bar is larger than before. The reinforcing bar can be stably fixed even with a relatively small tightening torque, and the deformation of the reinforcing bar is reduced, so that the tensile load of the reinforcing bar is not impaired due to the tightening of the tightening member. Further, since the pressing member has a curved shape so that both end portions thereof approach the reinforcing bar side in the longitudinal direction, when the pressing member is pressed to the reinforcing bar side using a fastening member, the pressing member becomes flat from the curved shape. Since it becomes a shape, the end of the pressing member does not warp in the direction opposite to the pressing direction, and the reinforcing bar can be pressed uniformly.

  Further, according to the reinforcing bar fixing device of the invention according to claim 2, the bolt body includes a fitting hole and an annular sliding contact surface formed at an outer peripheral edge of the fitting hole at the tip, and the pressing member Is fitted in the fitting hole in a state in which the pressing surface formed with a plurality of irregularities and the surface opposite to the pressing surface are in contact with the annular sliding surface. Since the surface opposite to the pressing surface of the pressing member is slidably in contact with and supported by the annular sliding contact surface, the pressing member protrudes from the outer peripheral surface of the reinforcing bar. Even if the pressing force against the reinforcing bars of the pressing member is unevenly abutted against the rib, the breakage is preferably prevented.

  According to the reinforcing bar fixing device of the invention of claim 3, a plurality of protrusions are formed on the pressing surface of the pressing member in the longitudinal direction at intervals smaller than the average interval of the nodes in the longitudinal direction of the reinforcing bar. Therefore, the pressing area of the pressing member against the reinforcing bar increases, and uneven distribution of the pressing force against the reinforcing bar of the pressing member is suitably prevented.

  According to the reinforcing bar fixing device of the invention according to claim 4, since the longitudinal dimension of the pressing member is at least three times the average interval of the nodes in the longitudinal direction of the reinforcing bar, the pressing member is the outer peripheral surface of the reinforcing bar. Accordingly, uneven distribution of the pressing force with respect to the reinforcing bars of the pressing member is preferably prevented.

  According to the reinforcing bar fixing device of the invention according to claim 5, the pressing member is disposed on at least one of the pair of side edges parallel to the longitudinal direction toward the pressing surface in the thickness direction. Since the inclined end face is formed, the interference between the pressing member and the connecting portion is prevented, and the bolt body is returned to the position where the pressing member provided at the tip of the bolt body contacts the screwing portion. And the interference between the reinforcing bar and the pressing member is prevented when the reinforcing bar is inserted from the opening between the threaded part of the reinforcing bar fixing device and the reinforcing bar receiving part connected thereto via the connecting part. At least one of the effects can be obtained.

According to the reinforcing bar fixing device of the invention according to claim 6 , the pressing surface of the pressing member has a concave shape in a cross section orthogonal to the longitudinal direction of the pressing member. Since the curved surface has the center of curvature on the same side as the surface, the pressing area increases, the rebar can be stably fixed even with a smaller tightening torque, and the deformation of the rebar is reduced, so that the tightening bolt can be tightened. Therefore, the tensile load of the reinforcing bar is not impaired.

Further, according to the reinforcing bar fixing device of the invention according to claim 7 , the reinforcing bar fixing device is provided on each of a pair of fitting members which are slidably fitted to each other in the axial direction, and the pair of reinforcing bars is attached to the reinforcing bar fixing device. Since it hold | maintains in the state by which the edge part was faced | matched mutually, it fixes suitably in the state which the end surface of a pair of reinforcing bar contacted mutually in gas pressure welding etc.

  Hereinafter, a reinforcing bar holding device 14 for gas pressure welding provided with reinforcing bar fixing devices 26 and 28 according to an embodiment of the present invention will be described with reference to the drawings.

  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 And a return spring 30 accommodated in the diameter sleeve 22 and energizing the pair of reinforcing bars 12a and 12b in a direction away from each other, and the pressing cylinder 16 fixed to the large diameter sleeve 22 drives the small diameter sleeve 24. It has become.

  Since the reinforcing bar fixing devices 26 and 28 for fixing the reinforcing bars 12b and 12a are configured in the same manner, the small diameter sleeve 24 will be described with reference to FIGS. 2 and 3 in which the side surface of FIG. The reinforcing-bar fixing device 28 fixed to will be described exclusively. 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 perpendicular to the longitudinal direction L, and a pair of screwed portions 34 branched in a C shape at the tip of the arm portion 32. And a reinforcing bar receiving portion 36 integrally connected to the screwing portion 34 via a connection portion 35 in a state of facing the screwing portion 34, and a fastening member screwed to one screwing 34. A tightening bolt 38 is provided. Between the threaded portion 34 and the reinforcing bar receiving portion 36, the reinforcing bar 12 a is attached to the reinforcing bar receiving portion 36 so as to face the fastening bolt 38 and the fastening bolt 38 that is pressed from a direction orthogonal to the longitudinal direction L. It is clamped between the provided concave or V-shaped receiving surface 40.

  FIG. 2 is a side view of FIG. 1 with a part cut away to illustrate the configuration of the reinforcing bar fixing device 28, showing a state in which the tightening bolt 38 has been advanced to a position for fixing the reinforcing bar 12a. Yes. 3 is a side view similar to FIG. 2, but the reinforcing bar 12a is taken in and out from the opening A between the threaded part 34 of the reinforcing bar fixing device 28 and the reinforcing bar receiving part 36 connected thereto via the connecting part 35. FIG. In this case, a state is shown in which the tightening bolt 38 is moved backward or backward to a position where the tightening bolt 38 comes into contact with the screwing portion 34.

  A cutout 42 is formed at the end of the large diameter sleeve 22 and a C-shaped ring member 44 having a cutout including the cutout 42 is fixed to the small diameter sleeve 24. The rebar fixing device 28 thus made protrudes to the outside through the notch 42 and is rotatable within a predetermined angle range. The angular position of the reinforcing bar fixing device 28 is such that the reinforcing bars 12a and 12b are positioned substantially concentrically by a pair of position adjusting bolts 46 screwed into both ends of the C-shaped ring member 44 having the notch. To be adjusted.

  As shown in FIG. 4, the fastening bolt 38 includes a head 50 having a hexagonal cross section at the base end, a male screw 52 formed on the outer peripheral surface, and a fitting hole formed on the front end surface. 54 and a cylindrical bolt body 58 having an annular sliding contact surface 56 formed at the opening edge thereof, and a pressing member 60 fitted in the fitting hole 54 of the bolt body 58 so as to be relatively rotatable. I have. As shown in FIG. 7, the pressing member 60 protrudes from a rectangular plate-shaped pressing plate portion 64 having a pressing surface 62 on the reinforcing bar 12 a side, and a surface 65 on the bolt body 58 side of the pressing plate portion 64. The shaft 65 is fitted into the fitting hole 54 in a state where the surface 65 is in sliding contact with the annular sliding contact surface 56. The shaft portion 66 has a radial hole 70 that penetrates in the radial direction and accommodates a plurality of (four in this embodiment) steel balls 68, and a radial hole 70 that opens in the end face on the base end side. A center hole 72 formed in the axial direction so as to intersect with the center hole 72 is formed, while an annular groove 74 formed in the circumferential direction on the inner peripheral surface of the fitting hole 54 is formed in the bolt body 58. A center hole 78 in which the needle member 76 is accommodated so as to be movable in the axial direction is formed. When the needle member 76 is urged by the spring 82 provided between the pair of embedded bolts 80 and the needle member 76 that are screwed into the base end portion of the center hole 78 and locked to each other, Since the tip of the needle member 76 forcibly moves the steel ball 68 accommodated in the radial hole 70 to the outer peripheral side, the steel ball 68 is brought into engagement with the annular groove 74, and the pressing member 60 and the bolt main body 58 are connected to each other so as not to be separated from each other while being relatively rotatable around the axis.

  6 and 7 are a plan view and a front view for explaining the pressing member 60. As shown in the plan view of FIG. 6, the pressing plate portion 64 of the pressing member 60 has a rectangular plate shape, and a plurality of protrusions that form triangular irregularities having the same height in the pressing surface 62. In the longitudinal direction L of the pressing plate portion 64, that is, in the longitudinal direction L of the reinforcing bar 12a, the strips 84 are equally spaced at an interval T that is sufficiently smaller than the average spacing Da of the nodes 88 in the longitudinal direction L of the reinforcing bars 12a and 12b. Are formed in parallel. The longitudinal dimension of the pressing surface 62 of the pressing member 60, that is, the longitudinal dimension of the reinforcing bars 12a and 12b is larger than the diameter of the bolt main body 58, and is a node 86 formed on the outer peripheral surface of the reinforcing bar 12a shown in FIGS. The average interval Da or the maximum interval Dm is set to be larger than the average interval Da or the maximum interval Dm. 8 shows the reinforcing bars 12a and 12b used in FIGS. 1 to 5, and FIGS. 9 and 10 show other examples of reinforcing bars 12a and 12b, which are nodes formed on the outer peripheral surface of the reinforcing bars 12a and 12b. 86 and rib 88 are shown respectively. As shown in FIG. 8, the ribs 88 are formed in parallel to the axial direction of the reinforcing bars 12 a and 12 b at two positions spaced 180 ° in the circumferential direction on the outer peripheral surfaces of the reinforcing bars 12 a and 12 b. The nodes 86 are a plurality of ridges that are located at a predetermined interval in the longitudinal direction L of the reinforcing bars 12a and 12b and that are continuous in the circumferential direction. The rib 88 may be formed as shown in FIGS. 9 and 10, the rib 88 is formed in parallel with the axial direction of the reinforcing bars 12a and 12b at two positions 180 degrees apart in the circumferential direction on the outer peripheral surfaces of the reinforcing bars 12a and 12b, as in FIG. However, the nodes 86 show an example in which the nodes 86 are arranged so as to be oblique to each other in a state where the inclination directions are alternately opposite.

  Further, the pressing plate portion 64 of the pressing member 60 has a connection portion 35 side, that is, an opening A toward both the pair of side edges parallel to the longitudinal direction L toward the pressing surface 62 side, that is, the reinforcing bar 12a side in the thickness direction. A pair of inclined end surfaces 92 and 94 are formed toward the side away from the center. As shown in FIG. 3, the inclined end surface 92 on the connection portion 35 side avoids interference with the connection portion 35 of the pressing plate portion 64, and the tightening bolt 38 is moved until the pressing plate portion 64 comes into contact with the screwing portion 34. Retreat is possible. Further, the inclined end surface 94 on the opening A side prevents the pressing plate portion 64 from interfering with the reinforcing bar 12a passing through the opening A, thereby facilitating the insertion and removal of the reinforcing bar 12a. The opening A side portion of the concave or V-shaped receiving surface 40 provided in the reinforcing bar receiving portion 36 so as to face the fastening bolt 38 is inclined so as to approach the fastening bolt 38 side toward the opening A side. The inclined end surface 94 on the opening A side is inclined at an angle substantially parallel to the opening A side portion of the receiving surface 40.

  In the gas pressure welding reinforcing bar holding device 14 configured as described above, for example, as shown in FIG. 3, the reinforcing bars 12 a and 12 b are inserted from the opening A between the fastening bolt (clamping member) 38 and the reinforcing bar receiving part 36. In this state, the tightening bolt 38 is rotated using an impact wrench, whereby the reinforcing bars 12a and 12b are fixed by the reinforcing bar fixing devices 26 and 28, respectively, as shown in FIG. 2 or FIG. In this way, the end faces of the reinforcing bars 12a and 12b are held in a state where they are abutted against each other. Then, they are pressed against each other by the pressing cylinder 16. In this state, the mutual end portions of the reinforcing bars 12a and 12b are heated and softened by a gas spanner (not shown) to be brought into pressure contact with each other.

  According to the reinforcing bar fixing devices 26 and 28 of the present embodiment, the fastening bolt (clamping member) 38 has a bolt body 58 in which the male screw 52 is formed and a longitudinal dimension W larger than the diameter of the bolt body 58. The pressing member 60 is formed in a plate shape, and is provided at the distal end portion of the bolt body 58 so as to be relatively rotatable about the axis of the bolt body 58 so that the longitudinal direction L is along the longitudinal direction L of the reinforcing bars 12a and 12b. Therefore, the pressing area of the pressing member 60 against the reinforcing bars 12a and 12b is larger than before, and the reinforcing bars 12a and 12b can be stably fixed even with a relatively small tightening torque, and the reinforcing bars 12a and 12b are deformed. By reducing, the tensile load of the reinforcing bars is not impaired due to the tightening of the tightening bolts 38.

  Further, according to the reinforcing bar fixing devices 26 and 28 of the present embodiment, the bolt main body 58 includes the fitting hole 54 and the annular sliding contact surface 56 formed on the outer peripheral edge of the fitting hole 54 at the tip portion. The pressing member 60 protrudes from a rectangular plate-shaped pressing plate portion 64 having a pressing surface 62 formed with a plurality of irregularities on the reinforcing bar 12a side, and a surface 65 opposite to the pressing surface 62 of the pressing plate portion 64. And a shaft portion 66 that is fitted in the fitting hole 54 in a state in which the surface 65 is in sliding contact with the annular sliding contact surface 56, and is opposite to the pressing surface 62 of the pressing member 60. Since the surface on the side is in sliding contact with and supported by the annular sliding contact surface 56, the pressing member 60 contacts the nodes 86 and ribs 88 protruding from the outer peripheral surfaces of the reinforcing bars 12a and 12b in a non-uniform manner. The central force of the pressing force against 60 rebars 12a and 12b is the bolt Be unevenly distributed with respect to the axis of the body 58, the damage can be preferably prevented.

  Further, according to the reinforcing bar fixing devices 26 and 28 of the present embodiment, the plurality of protrusions 84 are sufficiently larger than the average interval Da of the nodes 88 in the longitudinal direction L of the reinforcing bars 12a and 12b on the pressing surface 62 of the pressing member 60. Since the pressing member 60 is formed in the longitudinal direction L at a small interval T, the pressing region or pressing area of the pressing member 60 against the reinforcing bars 12a and 12b increases, and the uneven distribution of the pressing force of the pressing member 60 on the reinforcing bars 12a and 12b is preferable. Is prevented.

  Further, according to the reinforcing bar fixing devices 26 and 28 of the present embodiment, the longitudinal dimension W of the pressing member 60, that is, the pressing plate portion 64, is three times or more the average interval Da of the nodes 88 in the longitudinal direction L of the reinforcing bars 12a and 12b. For this reason, the pressing member 60 is uniformly in contact with the nodes 88 protruding from the outer peripheral surfaces of the reinforcing bars 12a and 12b, and uneven distribution of the pressing force of the pressing member 60 on the reinforcing bars 12a and 12b is preferably prevented.

  Further, according to the reinforcing bar fixing devices 26 and 28 of the present embodiment, both of the pair of side edge portions of the pressing plate portion 64 of the pressing member 60 parallel to the longitudinal direction L are on the pressing surface 62 side in the thickness direction. Since the inclined end surfaces 92 and 94 that are directed toward the connecting portion 35 are formed toward the connecting portion 35, interference between the pressing plate portion 64 of the pressing member 60 and the connecting portion 35 is prevented and provided at the distal end portion of the bolt body 58. The effect that the bolt main body 58 can be returned to the position where the pressing plate portion 64 of the pressing member 60 comes into contact with the screwing portion 34, that is, the backward movement, and the screwing portion 34 and the connecting portion 35 of the reinforcing bar fixing devices 26 and 28. When the reinforcing bars 12a and 12b are inserted through the opening A between the reinforcing bar receiving part 36 connected to the reinforcing bars 12a and 12b, interference between the reinforcing bars 12a and 12b and the pressing plate part 64 of the pressing member 60 is prevented. Effect that is is obtained, respectively.

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

  FIG. 11 shows a pressing member 60 of another embodiment. In the cross section orthogonal to the longitudinal direction L of the pressing plate portion 64 of the pressing member 100 of the present embodiment, the pressing surface 62 is curved so as to be a cylindrical concave surface in which the center of curvature C is located on the reinforcing bar 12a side. The protrusion 84 is also curved along the pressing surface 62.

  According to the reinforcing bar fixing devices 26 and 28 of the present embodiment, the pressing surface 62 of the pressing plate portion 64 of the pressing member 100 has a concave shape in which the central portion in the width direction is recessed in the cross section orthogonal to the longitudinal direction L. Therefore, as shown in FIG. 11, the curved surface has a center of curvature on the same side as the outer peripheral surface of the reinforcing bar 12a to be pressed. The reinforcing bar 12a can be stably fixed even with the applied torque, and the deformation of the reinforcing bar 12a is reduced, so that the tensile load of the reinforcing bar 12a is not impaired due to the tightening of the tightening bolt 38.

  12 and 13 show a pressing member 110 of still another embodiment. FIG. 12 is a view showing the reinforcing bar 12a clamped between the fastening bolt 38 and the reinforcing bar receiving part 36, which are screwed to the screwing part 34, from the opening A side, and FIG. 13 shows this embodiment. It is a top view which shows the pressing member 60 used for. Although not shown in FIG. 13 which is a plan view, as shown in FIG. 12, the pressing plate portion 64 of the pressing member 110 in this embodiment has both ends thereof in the longitudinal direction L as shown in FIG. It has a curved shape so that the part approaches the rebar 12a side

  According to the pressing member 110 of the present embodiment, when the reinforcing bar 12a is pressed by the fastening bolt 38 in the direction shown by the arrow in FIG. 14 or FIG. 15, the state after the pressing shown in FIG. The pressing plate portion 64 of the pressing member 110 is deformed from the curved state to the flat state.

  Therefore, according to the reinforcing bar fixing devices 26 and 28 of the present embodiment, the pressing plate portion 64 of the pressing member 110 has a curved shape so that both end portions thereof approach the reinforcing bar 12a side in the longitudinal direction L. From the curved shape to the flat shape when the pressing plate portion 64 is pressed to the reinforcing bar 12a side using the tightening bolt 38, the end in the longitudinal direction L of the pressing portion plate portion 64 is indicated by an arrow in FIG. The direction opposite to the pressing direction shown does not warp, and the rebar 12a can be pressed uniformly.

  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.

  For example, a plurality of protrusions 84 are arranged at a constant interval T in the longitudinal direction of the reinforcing bars 12a and 12b on the pressing surface 62 provided at the tip of the fastening bolt 38 of the above-described embodiment. In addition, a large number of triangular pyramids and conical protrusions may be arranged, and a surface processed with a pear satin may be provided.

  In addition, the pressing surface 62 provided at the tip of the tightening bolt 38 of the above-described embodiment is rectangular or partially circular, but may have other shapes.

  Further, in the fastening bolt 38 of the above-described embodiment, the structure in which the bolt main body 58 and the pressing member 60 are connected to each other so as to be relatively rotatable around the axis may be other structures.

  In the above-described embodiment, the reinforcing bar fixing devices 26 and 28 are used in the gas pressure welding reinforcing bar holding device 14 for gas pressure welding the butted ends of the pair of reinforcing bars 12a and 12b. You may be provided in the apparatus of a use.

  Further, although the pair of inclined end surfaces 92 and 94 are provided on the pressing plate portion 64 of the pressing member 60 of the above-described embodiment, it is not always necessary to provide only one of them. .

  In addition, although not illustrated one by one, the present invention can be variously modified without departing from the gist thereof.

It is the front view which notched a part which shows the reinforcing bar holding apparatus for gas pressure welding provided with the reinforcing bar fixing apparatus of one Example of this invention. FIG. 2 is a side view of FIG. 1 with a part cut away in order to explain the configuration of the reinforcing bar fixing device, showing a state in which the tightening bolt is advanced to a position for fixing the reinforcing bar. FIG. 2 is a side view of FIG. 1 with a part cut away to illustrate the configuration of a reinforcing bar fixing device, between a threaded portion of the reinforcing bar fixing device and a reinforcing bar receiving portion connected thereto via a connecting portion. A state in which the tightening bolt is moved backward to a position where the pressing member comes into contact with the screwing portion when the reinforcing bar is taken in and out from the opening is shown. It is sectional drawing explaining the structure of the clamping bolt with which the reinforcing bar fixing apparatus of FIG. 1 was equipped. It is a figure which expands and shows the reinforcing bar fixing apparatus of FIG. 1 from the opening side. It is a top view which shows the press surface of the press member of the clamping bolt of FIG. It is a side view which shows the press member of the clamping bolt of FIG. It is a figure explaining the shape of the rib of the reinforcing bar of FIG. 1, and a node. It is a figure explaining the shape of the rib of a reinforcing bar of another example, and a node. It is a figure explaining the shape of the rib of a reinforcing bar of FIG. 9, and the node from the position rotated 90 degree | times with respect to the reinforcing bar of FIG. In the press member in the other Example of this invention, it is a side view explaining the curved shape of a press plate part. FIG. 6 is an enlarged view of a reinforcing bar fixing device from the opening side in another embodiment of the present invention, which corresponds to FIG. 5. It is a top view which shows the press surface of the press member used in the Example of FIG. In the Example of FIG. 12, it is a figure explaining the deformation | transformation of the press plate part of the press member at the time of reinforcing bar, Comprising: The state before a press is shown. In the Example of FIG. 12, it is a figure explaining the deformation | transformation of the press plate part of the press member at the time of reinforcing bar, Comprising: The state after a press is shown.

Explanation of symbols

12a, 12b: Reinforcing bars 26, 28: Rebar fixing device 34: Screwing part 35: Connection part 36: Reinforcing bar receiving part 38: Tightening bolt (tightening member)
56: Annular sliding contact surface 58: Bolt body 60, 100, 110: Pressing member 62: Pressing plane 84: Projection (unevenness)
86: Node 92, 94: Inclined end face

Claims (7)

A fastening member for fastening 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, a screwed portion into which the fastening member is screwed, and the reinforcing bar A fastening member that is integrally provided with a reinforcing bar receiving part facing the screwing part and a connecting part that connects the screwing part and the reinforcing bar receiving part to receive the side surface; Reinforcing bar fixing device of a type that removably fixes the reinforcing bar between the reinforcing bar receiving part, the fastening member,
A bolt body formed with a male thread;
It has a plate shape having a longitudinal dimension larger than the diameter of the bolt body, and is relatively rotatable around the axis of the bolt body at the tip of the bolt body so that the longitudinal direction is along the longitudinal direction of the reinforcing bar. and a pressing member provided, seen including,
The reinforcing member fixing device , wherein the pressing member has a curved shape so that both ends thereof approach the reinforcing bar side in the longitudinal direction . The bolt body includes a fitting hole and an annular sliding contact surface formed on an outer peripheral edge of the fitting hole at a tip portion,
The pressing member protrudes from a pressing surface on which a plurality of irregularities are formed and a surface opposite to the pressing surface, and the surface is in sliding contact with the annular sliding surface. The rebar fixing device according to claim 1, further comprising a shaft portion fitted to the rebar.   The reinforcing bar fixing device according to claim 1 or 2, wherein a plurality of protrusions are formed on the pressing surface of the pressing member in the longitudinal direction at an interval smaller than an average interval of nodes in the longitudinal direction of the reinforcing bar. .   The reinforcing bar fixing device according to any one of claims 1 to 3, wherein a longitudinal dimension of the pressing member is at least three times an average interval of nodes in a longitudinal direction of the reinforcing bar.   The pressure member is characterized in that an inclined end surface is formed on at least one of a pair of side edge portions parallel to the longitudinal direction toward the connection portion as it goes toward the pressure surface in the thickness direction. The reinforcing bar fixing device according to any one of 2 to 4. The reinforcing bar fixing device according to any one of claims 1 to 5 , wherein the pressing surface has a concave shape in a cross section orthogonal to a longitudinal direction of the pressing member. 2. The reinforcing bar fixing device is provided on each of a pair of fitting members that are slidably fitted to each other in an axial direction, and holds the pair of reinforcing bars in a state in which end portions thereof are abutted with each other. The rebar fixing device of any one of thru | or 6 .

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