JP2010037764A - Reinforcement holding device for gas pressure welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement holding device for gas pressure welding that can efficiently fix the ends of a pair of reinforcements in a mutually abutting state even if the end face axes of the ends of the pair of reinforcements do not coincide with each other and the axis direction positions overlap. <P>SOLUTION: A large-diameter sleeve 22 comprises, at both ends, a first mounting device 84 and a second mounting device 86 for mounting a hydraulic cylinder 16. A first reinforcement grip device 26 is provided at one end of the large-diameter sleeve 22 so as to be relatively rotatable around an axis J and to be unmovable in the axial direction. Consequently, even if the end face axes of the ends of the pair of reinforcements 12a, 12b do not coincide with each other, the first reinforcement grip device 26 and a second reinforcement grip device 28 can easily grip the ends of the pair of reinforcements 12a, 12b. The first reinforcement grip device 26 is then rotated relative to one end of the large-diameter sleeve 22 to efficiently and easily allow the axes of the ends of the pair of reinforcements 12a, 12b to coincide with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforcing bar holding device for gas pressure welding for holding a pair of reinforcing bars butted against each other during gas pressure welding.

  For example, in a building having an RC structure or an SRC structure, it is necessary to connect the reinforcing bars embedded in the concrete in the longitudinal direction before constructing the reinforced concrete. For this reason, as described in Patent Document 1, for example, there is proposed a gas pressure welding reinforcing bar holding device that fixes both ends of a pair of reinforcing bars in a state of abutting against each other at the time of gas pressure welding. According to such a rebar holding device for gas pressure welding, the end portions of the pair of rebars pressed against each other are pressed until a large-diameter bulging portion is formed in a red-hot state, and this state is held and joined. In order to perform gas pressure welding, the ends of the pair of reinforcing bars are fixed in a state where they abut each other.

  At a construction site, a plurality of reinforcing bars (main reinforcing bars) are respectively extended by gas pressure welding using the above-mentioned gas pressure welding reinforcing bar holding device, and then another reinforcing bar arranged perpendicular to them, for example, in the form of a square frame A plurality of reinforcing bars are assembled at predetermined intervals so as to form a cage shape corresponding to a column or a beam by securing them to the hoop bars one by one using a wire.

On the other hand, in order to further increase the rate of machine execution and reduce the number of workers and the work range, a plurality of reinforcing bars (main bars) and cage-like reinforcing bar units are formed so as to have shapes corresponding to columns and beams. Pre-assemble at another work place using a hoop and a wire so that the cage-shaped rebar unit is moved to a predetermined position with a crane, similar to the assembly of a steel frame, For example, an enforcement method for connecting reinforcing bars by gas pressure welding between a plurality of reinforcing bars already disposed and protruding from concrete has been performed.
Japanese Patent No. 3498046

  By the way, as described above, when joining a plurality of reinforcing bars (main reinforcing bars) of a basket-shaped reinforcing bar unit assembled in advance to a plurality of reinforcing bars (main reinforcing bars) already arranged, Using a rebar holding device for gas pressure welding, fix the pair of rebars against each other and press the end of the pair of rebars until the large-diameter bulge is formed in a red-hot state. Gas pressure welding for maintaining the state and joining is performed. However, between the ends of the multiple reinforcing bars (main reinforcing bars) of the cage-shaped reinforcing bar unit and the ends of the multiple reinforcing bars (main reinforcing bars) that have already been arranged, the axial positions and axes of those end faces In some cases, the centers do not necessarily coincide with each other, and the axial positions overlap. For this reason, it becomes difficult to try to fix the ends of a pair of reinforcing bars in a state where they are in contact with each other using the conventional gas pressure welding reinforcing bar holding device, and the workability is greatly reduced. .

  The present invention has been made in the background of the above circumstances, and the purpose of the present invention is that even if the axial centers of the end surfaces of the pair of reinforcing bars do not coincide with each other and the axial positions overlap. An object of the present invention is to provide a reinforcing bar holding device for gas pressure welding that can efficiently fix the ends of a pair of reinforcing bars in a state of abutting each other.

  The gist of the invention according to claim 1 for achieving such an object is as follows: (a) a large-diameter tubular member, and a relative movement around the axial center that is relatively movable in the axial direction in the large-diameter tubular member. A small-diameter tubular member fitted in a non-rotatable manner, a first rebar-gripping device provided at one end of the large-diameter tubular member for grasping one rebar, and a small-diameter tubular member fixed integrally. A second reinforcing bar gripping device for gripping the other reinforcing bar, and the one reinforcing bar gripped by the first reinforcing bar gripping device and the other reinforcing bar gripped by the second reinforcing bar gripping device are mutually butted In this state, a pressing cylinder mounted on the other end of the large-diameter tubular member drives the small-diameter tubular member in the axial direction to fix the one reinforcing bar and the other reinforcing bar in a pressure-contact state with each other. Reinforcing bar holding device, (b) said large diameter Each of the members has a mounting device for mounting the pressing cylinder at both ends, and (c) the first rebar gripping device is a large-diameter tubular member that is relatively rotatable about an axis and immovable in the axial direction. It exists in the one end part of a member.

  A gist of the invention according to claim 2 is that, in the invention according to claim 1, (d) a relative operated to prevent relative rotation between the first reinforcing bar gripping device and the large-diameter tubular member. The object is to further include a rotation preventing device.

  The gist of the invention according to claim 3 is that, in the invention according to claim 1 or 2, (e) the second rebar gripping device is fixed to the other end of the small-diameter tubular member, and (f) The large-diameter tubular member is formed with a guide slit formed at the other end so as to penetrate the second reinforcing bar gripping device in the thickness direction and guide it in the axial direction.

  Further, the gist of the invention according to claim 4 is that, in the invention according to any one of claims 1 to 3, (g) the axis of the large-diameter tubular member, the first rebar gripping device, and the second The reason is that the axes of one and the other reinforcing bars gripped by the reinforcing bar gripping device are set to be parallel to each other.

  Moreover, the gist of the invention according to claim 5 is that, in the invention according to any one of claims 1 to 4, (h) one reinforcing bar gripped by the first reinforcing bar gripping device and the second reinforcing bar. The other reinforcing bar gripped by the gripping device is that the pressing cylinder attached to one end of the large-diameter tubular member is separated from each other by driving the small-diameter tubular member in the axial direction.

  A gist of the invention according to claim 6 is that, in the invention according to any one of claims 1 to 5, (i) one reinforcing bar gripped by the first reinforcing bar gripping device and the second reinforcing bar. The other reinforcing bar gripped by the gripping device is a state in which the pressing cylinder attached to one end of the large-diameter tubular member is separated from each other by driving the small-diameter tubular member in the axial direction. The first reinforcing bar gripping device is centered on each other by being rotated relative to the large-diameter tubular member.

  According to the reinforcing bar holding device for gas pressure welding according to the first aspect of the invention, the large-diameter tubular member is provided with mounting devices for mounting the pressing cylinder at both ends, and the first reinforcing bar gripping device has a shaft. Since it is provided at one end portion of the large-diameter tubular member so as to be relatively rotatable around the center and not movable in the axial direction, even when the axial centers of the end surfaces of the pair of rebars do not coincide with each other, the first rebar gripping The apparatus and the second reinforcing bar gripping device can easily grip the ends of the pair of reinforcing bars, and then rotate the first reinforcing bar gripping device relative to one end of the large-diameter tubular member to thereby remove the pair of reinforcing bars. The axis of the end can be made coincident. Moreover, even if the axial direction position of a pair of reinforcing bars overlaps, the first reinforcing bar gripping device and the second reinforcing bar gripping device can easily grip the end portions of the pair of reinforcing bars, and then the pressing cylinder is formed in a large-diameter tubular shape. By mounting the one end of the member and driving the small-diameter tubular member, the overlap of the ends of the pair of reinforcing bars can be easily eliminated, and the first reinforcing bar gripping device is rotated relative to the one end of the large-diameter tubular member. By doing so, the axial centers of the ends of the pair of reinforcing bars can be matched efficiently.

  According to the reinforcing bar holding device for gas pressure welding according to the second aspect of the present invention, the relative rotation preventing device operated to prevent relative rotation between the first reinforcing bar gripping device and the large-diameter tubular member is provided. Therefore, by setting the relative rotation preventing device in a state in which the relative rotation between the first reinforcing bar gripping device and the large-diameter tubular member is allowed, one reinforcing bar gripped by the first reinforcing bar gripping device and the second reinforcing bar gripping The centering operation with the other reinforcing bar gripped by the device is facilitated, and the relative rotation blocking device is set in a state in which the relative rotation between the first reinforcing bar gripping device and the large-diameter tubular member is blocked. There is an advantage that misalignment of the reinforcing bar and the other reinforcing bar is suitably prevented.

  According to the reinforcing bar holding device for gas pressure welding of the invention according to claim 3, the second reinforcing bar holding device is fixed to the other end of the small diameter tubular member, and the large diameter tubular member includes the second reinforcing bar. Since the guide slit that penetrates the gripping device in the thickness direction and guides it in the axial direction is formed at the other end portion, the second rebar gripping device has the first rebar gripping provided at one end portion of the large-diameter tubular member. Since it is located at a certain distance from the apparatus, the ends of the pair of reinforcing bars can be easily grasped. The large-diameter tubular member is formed with a guide slit at the other end that penetrates the second rebar gripping device in the thickness direction and guides it in the axial direction, so that the small-diameter tubular member becomes a large-diameter tubular member. On the other hand, since it is fitted in such a manner that it can move in the axial direction and cannot rotate relative to the axis, misalignment in the process of press-contacting the ends of the pair of reinforcing bars is prevented.

  According to the reinforcing bar holding device for gas pressure welding of the invention according to claim 4, the axial center of the large-diameter tubular member and one and the other reinforcing bars gripped by the first reinforcing bar gripping device and the second reinforcing bar gripping device Since the shaft centers are set so as to be parallel to each other, misalignment in the process of pressing in a state where the ends of the pair of reinforcing bars are in contact with each other is prevented.

  Further, according to the reinforcing bar holding device for gas pressure welding of the invention according to claim 5, one reinforcing bar gripped by the first reinforcing bar gripping device and the other reinforcing bar gripped by the second reinforcing bar gripping device are There is an advantage that the pressing cylinder mounted on one end of the large-diameter tubular member drives the small-diameter tubular member in the axial direction to be separated from each other in the axial direction.

  Further, according to the reinforcing bar holding device for gas pressure welding of the invention according to claim 6, one reinforcing bar gripped by the first reinforcing bar gripping device and the other reinforcing bar gripped by the second reinforcing bar gripping device are In a state where the pressing cylinders mounted on one end of the large-diameter tubular member are separated from each other by driving the small-diameter tubular member in the axial direction, the first rebar gripping device is attached to the large-diameter tubular member. By being rotated relative to each other, there is an advantage that centering is performed mutually.

  Hereinafter, a reinforcing bar holding device 10 for gas pressure welding 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 rebar holding apparatus 10 for gas pressure welding hold | maintained in the state put together is shown. The gas pressure welding reinforcing bar holding device 10 includes a single-acting hydraulic cylinder (pressing cylinder) 16 that generates pressure applied to the reinforcing bars 12a and 12b using hydraulic pressure, and is capable of relative movement in the axial direction. A large-diameter sleeve 22 that is a large-diameter tubular member and a small-diameter sleeve 24 that is a small-diameter tubular member that are concentric with each other so as to be relatively rotatable around an axis, and one end of the large-diameter sleeve 22. The first rebar gripping device 26 and the second rebar gripping device 28 integrally fixed to the small diameter sleeve 24, and the hydraulic cylinder 16 attached and fixed to the end of the large diameter sleeve 22 is a small diameter sleeve. 24 is driven to move relative to the axial direction.

  Since the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 for fixing the reinforcing bars 12a and 12b in the gripped state are configured in the same manner, FIG. 2 and FIG. The second rebar gripping device 28 fixed to the small diameter sleeve 24 will be described exclusively with reference to FIG. The second reinforcing bar gripping 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 branched in a C shape at the tip of the arm portion 32. 34, a reinforcing bar receiving portion 36 that is 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 And a tightening bolt 38. Between the threaded part 34 and the reinforcing bar receiving part 36, the reinforcing bar 12 b is attached to the reinforcing bar receiving part 36 so as to face the fastening bolt 38 and the fastening bolt 38 that presses from the direction orthogonal to the longitudinal direction L. It is clamped between the provided concave or V-shaped receiving surface 40. The receiving surface 40 is composed of a plane parallel to the axis J of the large diameter sleeve 22 and the small diameter sleeve 24 and is formed at an equal distance from the axis. The reinforcing bars 12 a and 12 b gripped by the reinforcing bar gripping device 28 are parallel to and concentric with the axis J of the large diameter sleeve 22 and the small diameter sleeve 24.

  FIG. 2 is a side view of FIG. 1 with a part cut away for explaining the configuration of the second reinforcing bar gripping device 28, and shows a state in which the tightening bolt 38 is advanced to a position where the reinforcing bar 12b is fixed. Show. FIG. 3 is a side view similar to FIG. 2, but the reinforcing bar 12 b from the opening A between the threaded part 34 of the second reinforcing bar gripping device 28 and the reinforcing bar receiving part 36 connected thereto via the connecting part 35. The state is shown in which the tightening bolt 38 is moved backward or backward to the position where the tightening bolt 38 abuts on the threaded portion 34 when the screw is inserted and removed.

  At the end of the large-diameter sleeve 22 is formed a C-shaped ring member having a notch 42 formed in a longitudinal or slit shape parallel to the axial center J direction and including the notch 42. 44 is fixed, and the second rebar gripping device 28 fixed to the small-diameter sleeve 24 protrudes to the outside through the notch 42 and is rotatable within a predetermined angular range. The angular position of the second reinforcing bar gripping device 28 is such that the reinforcing bars 12a and 12b are positioned substantially concentrically by a pair of position adjusting bolts 46 screwed to 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. The pressing member 60 protrudes from a rectangular plate-shaped pressing plate portion 64 having a pressing surface 62 on the reinforcing bar 12a or 12b side, and a surface 65 on the bolt body 58 side of the pressing plate portion 64, and the surface 65 is annular. The shaft portion 66 is fitted into the fitting hole 54 in a state of being brought into sliding contact with the 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.

  Returning to FIG. 1, the large diameter sleeve 22 is integrally provided by screwing a first mounting device 84 and a second mounting device 86 for mounting the hydraulic cylinder 16 to one end and the other end. Yes. The first mounting device 84 and the second mounting device 86 form a short tube having a diameter larger than that of the large-diameter sleeve 22, and receive an engaging protrusion 16 p that protrudes in the outer diameter direction at the distal end portion of the hydraulic cylinder 16. Are respectively provided with L-shaped notches 88 penetrating in the thickness direction. The L-shaped notch 88 includes an axial portion 90 that extends in a direction parallel to the axis J and opens at the end face, and a circumferential portion 92 that extends from the end of the axial portion 90 in the circumferential direction. ing. With the engaging projection 16p of the hydraulic cylinder 16 inserted into the axial portion 90, the tip of the hydraulic cylinder 16 is fitted into the opening of the mounting device 84 or 86 and pushed in, and the engaging projection 16p is axially moved. The hydraulic cylinder 16 is detachably mounted by moving the engagement protrusion 16p into the circumferential portion 92 by rotating the hydraulic cylinder 16 about the axis J while reaching the end of the portion 90. It has become. Abutting members 94 and 96 for abutting the front end surface of the piston rod 16b of the hydraulic cylinder 16 are fixed to both end surfaces of the small diameter sleeve 24.

  The first rebar gripping device 26 is provided at one end of the large-diameter sleeve 22 so as to be relatively rotatable about the axis J and not movable in the axial direction. A cylindrical portion 100 having a through hole 98 in the axis J direction slightly larger than the outer diameter of the large-diameter sleeve 22 is formed at the proximal end of the arm portion 32 of the first reinforcing bar gripping device 26. One end of the large-diameter sleeve 22 is slidably fitted into the shaped portion 100, so that the first reinforcing bar gripping device 26 is axially centered with respect to the large-diameter sleeve 22 as shown by an arrow Y in FIG. The relative rotation around J is possible. In addition, an annular stopper 102 is fixed by welding at one end of the large-diameter sleeve 22 at a position separated from the short tubular mounting device 84 by the same distance as the width of the cylindrical portion 100. The reinforcing bar gripping device 26 is not movable relative to the large diameter sleeve 22 in the axial center J direction. A nut 104 is welded to the outer peripheral surface of the cylindrical portion 100 formed at the proximal end of the arm portion 32 of the first reinforcing bar gripping device 26, and the first outer surface of the large-diameter sleeve 22 is pushed by pressing the first outer peripheral surface. A rotation stop bolt 106 for stopping relative rotation of the reinforcing bar gripping device 26 with respect to the large diameter sleeve 22 is screwed into the nut 104.

  The gas pressure welding reinforcing bar holding device 10 configured as described above is arranged in the vertical direction within the reinforcing bar unit assembled in a basket shape at the end of one reinforcing bar 12a protruding in the vertical direction, that is, upward. A case where the end of the other reinforcing bar 12b, which is one of the plurality of reinforcing bars, is gas-welded will be described with reference to FIGS.

  First, the hydraulic cylinder 16 is mounted on the first mounting device 84 on one end side (the lower end side in the drawing) of the large-diameter sleeve 22, and the tightening bolt 38, the position adjusting bolt 46, and the rotation-stop bolt 106 are loosened. The reinforcing bar holding device 10 for pressure welding is prepared, and the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 of the pressure welding reinforcing bar holding device 10 receive the ends of the pair of reinforcing bars 12a and 12b in the opening A. When the tightening bolts 38 are tightened in the above state, they are fixed in a gripped state, and the position adjusting bolt 46 is tightened. The gripping positions of the pair of reinforcing bars 12a and 12b are determined at a predetermined distance from the end surfaces of the pair of reinforcing bars 12a and 12b. FIG. 6 shows this state. In this state, the pair of reinforcing bars 12a and 12b are not separated in the axial direction, and the axial direction is determined by the variation in the position of the plurality of reinforcing bars arranged in the vertical direction in the reinforcing bar unit assembled in a cage shape. Are overlapped by the length indicated by x in FIG.

  Next, the hydraulic cylinder 16 is driven, the piston rod 16b is protruded to move the small diameter sleeve 24 and the second rebar gripping device 28 fixed thereto to the rebar 12b side, and between the end surfaces of the pair of rebars 12a and 12b. A gap y is formed. FIG. 7 shows this state. In this state, a bar-like tool such as a bar or a wrench is inserted between the reinforcing bar 12b and the large-diameter sleeve 22 and operated in a direction in which the reinforcing bar 12a and the reinforcing bar 12b are concentric. 12b is centered. Next, the rotation-stop bolt 106 is tightened to prevent relative rotation between the large-diameter sleeve 22 and the first reinforcing bar gripping device 26, and the tightening state of the position adjusting bolt 46 is changed as necessary to further center the shaft. Is done. Then, by stopping the supply of hydraulic pressure to the hydraulic cylinder 16 and retracting the piston rod 16b, the end surfaces of the pair of reinforcing bars 12a and the reinforcing bars 12b are brought into contact with each other.

  Next, the hydraulic cylinder 16 is detached from the first mounting device 84 and mounted on the second mounting device 86 on the opposite side. By driving the hydraulic cylinder 16 in this state, the piston rod 16b is protruded to move the small diameter sleeve 24 and the second rebar gripping device 28 fixed thereto to the rebar 12a side, and between the end surfaces of the pair of rebars 12a and 12b. Press contact with a predetermined pressure. FIG. 8 shows this state. In this state, when the ends of the rebars 12a and 12b are red-heated using a pressure welding burner (not shown), the swelled into a spherical shape. When the heating by the pressure welding burner is stopped, the pair of reinforcing bars 12a and 12b Joining is completed.

  As described above, according to the reinforcing bar holding device 10 for gas pressure welding of the present embodiment, the large diameter sleeve 22 (large diameter tubular member) has the first mounting device 84 and the second mounting device for mounting the hydraulic cylinder 16. 86 is provided at both ends, and the first rebar gripping device 26 is provided at one end of the large-diameter sleeve 22 so as to be relatively rotatable about the axis J and immovable in the axial direction. Even if the axial centers of the end faces of the end portions of 12 and 12b do not coincide with each other, the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 can easily grip the ends of the pair of reinforcing bars 12a and 12b, and then By rotating the single reinforcing bar gripping device 26 relative to one end of the large-diameter sleeve 22, the axes of the ends of the pair of reinforcing bars 12a and 12b can be aligned. Further, even if the axial positions of the pair of reinforcing bars 12a and 12b overlap, the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 can easily grip the ends of the pair of reinforcing bars, and then hydraulically By mounting the cylinder 16 on one end side of the large-diameter sleeve 22 and driving the small-diameter tubular sleeve 24, the overlap between the ends of the pair of rebars 12a and 12b can be easily eliminated, and the first rebar gripping device 26 is made large. By rotating relative to one end of the tubular sleeve 22, the axial centers of the ends of the pair of reinforcing bars 12a and 12b can be made to coincide efficiently.

  Further, according to the gas pressure welding reinforcing bar holding device 10 of the present embodiment, the rotation stopping bolt 106 (relative rotation blocking device) operated to prevent relative rotation between the first reinforcing bar gripping device 26 and the large diameter sleeve 22 is provided. Since the rotation prevention bolt 106 is in a state in which relative rotation between the first reinforcing bar gripping device 26 and the large diameter sleeve 22 is allowed, one reinforcing bar 12a gripped by the first reinforcing bar gripping device 26 is provided. And the other reinforcing bar 12b gripped by the second reinforcing bar gripping device 28 can be easily centered, and the rotation stop bolt 106 prevents relative rotation between the first reinforcing bar gripping device 26 and the large diameter sleeve 22. By doing so, there is an advantage that misalignment is suitably prevented when the one reinforcing bar 12a and the other reinforcing bar 12b are pressed.

  Further, according to the gas pressure welding reinforcing bar holding device 10 of the present embodiment, the second reinforcing bar gripping device 28 is fixed to the other end of the small diameter tubular sleeve 24 (small diameter tubular member), and the large diameter tubular sleeve 22 includes The second rebar gripping device 28 has a large-diameter tubular sleeve 22 because a guide slit-shaped notch 42 that penetrates the rebar gripping device 28 in the thickness direction and guides it in the direction of the axis J is formed at the other end. Since the first reinforcing bar holding device 26 provided at one end of the reinforcing bar is positioned at a certain distance, the ends of the pair of reinforcing bars 12a and 12b can be easily held. Further, the large-diameter tubular sleeve 22 is formed with a notch 42 that penetrates the second rebar gripping device 28 in the thickness direction and guides it in the axial center J direction. Since it is fitted to the tubular sleeve 22 so as to be movable in the axial direction and not relatively rotatable around the axis, misalignment in the process of pressing in a state where the ends of the pair of reinforcing bars 12a and 12b are brought into contact with each other. Is prevented.

  Further, according to the reinforcing bar holding device 10 for gas pressure welding of the present embodiment, the pair of reinforcing bars 12a and 12b gripped by the axis J of the large-diameter tubular sleeve 22 and the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28. Is set so as to be parallel to each other, so that misalignment in the process of pressing in the state where the ends of the pair of reinforcing bars 12a and 12b are in contact with each other is prevented.

  Further, according to the reinforcing bar holding device 10 for gas pressure welding of the present embodiment, the one reinforcing bar 12a gripped by the first reinforcing bar gripping device 26 and the other reinforcing bar 12b gripped by the second reinforcing bar gripping device 28 are large. There is an advantage that the hydraulic cylinder 16 attached to one end of the radial tubular sleeve 22 is separated from each other in the axial center J direction by driving the small diameter tubular sleeve 24 in the axial center J direction.

  Further, according to the reinforcing bar holding device 10 for gas pressure welding of the present embodiment, the one reinforcing bar 12a gripped by the first reinforcing bar gripping device 26 and the other reinforcing bar 12b gripped by the second reinforcing bar gripping device 28 are large. In a state where the hydraulic cylinder 16 attached to one end of the tubular sleeve 22 is separated from each other by driving the small-diameter tubular sleeve 24 in the axial center J direction, the first rebar gripping device 26 is the large-diameter tubular sleeve. By being relatively rotated with respect to 22, there is an advantage that centering is performed mutually.

  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, in the above-described embodiment, the first mounting device 84 and the second mounting device 86 fixed to one end and the other end of the large-diameter sleeve member 22 are a short cylindrical member and an L-shape formed thereon. The hydraulic cylinder 16 is mounted by engaging the tip of the hydraulic cylinder 16 with the L-shaped cutout 88. The first mounting device 84 and the second mounting device 86 are provided with other mounting structures such as a structure in which the distal end portion of the hydraulic cylinder 16 is screwed and a structure in which the distal end portion of the hydraulic cylinder 16 is mounted by bolting. There may be.

  In the above-described embodiment, the large-diameter sleeve member 22 is slidably fitted into the cylindrical portion 100 provided at the proximal end portion of the first rebar gripping device 26, so that the first rebar gripping device 26 is provided. However, the cylindrical portion 100 may be slidably fitted into the large-diameter sleeve member 22 or the like.

  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 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 gripping device of FIG. 1, showing a state in which the tightening bolt is advanced to a position where the reinforcing bar is fixed. FIG. 2 is a side view of FIG. 1 with a part cut away to illustrate the configuration of a reinforcing bar gripping device, between a threaded portion of the reinforcing bar gripping device and a reinforcing bar receiving unit connected thereto via a connecting part. 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 inserted and removed from the opening is shown. It is sectional drawing explaining the structure of the clamping bolt with which the reinforcing bar holding | gripping apparatus of FIG. 1 was equipped. It is a figure which expands and shows the reinforcing bar holding apparatus of FIG. 1 from the opening side. It is a figure explaining the use condition of the reinforcing bar holding apparatus for gas pressure welding of FIG. 1, Comprising: It is a figure which shows the state with which the edge part was mounted | worn with a pair of reinforcing bars overlapped in the longitudinal direction. It is a figure explaining the use condition of the reinforcing bar holding apparatus for gas-pressure welding of FIG. 1, Comprising: It is a figure which shows the state which pulled apart a pair of reinforcing bar with which the edge part overlapped in the longitudinal direction. It is a figure explaining the use condition of the reinforcing bar holding apparatus for gas pressure welding of FIG. 1, Comprising: It is a figure which shows the state mutually press-contacted in the state which faced each other.

Explanation of symbols

10: Rebar holding device for gas pressure welding 12a: Rebar, 12b: Rebar 16: Hydraulic cylinder (pressing cylinder)
22: Large diameter sleeve (large diameter tubular member)
24: Small diameter sleeve (small diameter tubular member)
26: first reinforcing bar gripping device 28: second reinforcing bar gripping device 42: notch 84: first mounting device 86: second mounting device 106: rotation stop bolt (relative rotation blocking device)

Claims (6)

A large-diameter tubular member, a small-diameter tubular member fitted in the large-diameter tubular member so as to be relatively movable in the axial direction and not relatively rotatable around the axial center, and provided at one end of the large-diameter tubular member A first reinforcing bar gripping device for gripping one reinforcing bar, and a second reinforcing bar gripping device that is integrally fixed to the small-diameter tubular member and grips the other reinforcing bar. A pressing cylinder mounted on the other end of the large-diameter tubular member in a state in which the one reinforcing bar gripped and the other reinforcing bar gripped by the second reinforcing bar gripping device are in contact with each other pivots on the small-diameter tubular member Reinforcing bar holding device for gas pressure welding which fixes the one reinforcing bar and the other reinforcing bar to each other in the pressure contact state by driving in the direction of the gas,
The large-diameter tubular member includes a mounting device for mounting the pressing cylinder at both ends,
The first reinforcing bar gripping device is provided at one end of the large-diameter tubular member so as to be relatively rotatable about an axis and not movable in the axial direction. The rebar holding device for gas pressure welding according to claim 1, further comprising a relative rotation prevention device operated to prevent relative rotation between the first rebar gripping device and the large-diameter tubular member. The second rebar gripping device is fixed to the other end of the small-diameter tubular member,
3. The gas according to claim 1, wherein the large-diameter tubular member is formed with a guide slit at the other end portion through which the second rebar gripping device penetrates in the thickness direction and guides in the axial direction. Rebar holding device for pressure welding.   The axis of the large-diameter tubular member and the axes of one and the other reinforcing bars gripped by the first reinforcing bar gripping device and the second reinforcing bar gripping device are set to be parallel to each other. The reinforcing bar holding device for gas pressure welding according to any one of claims 1 to 3.   One of the reinforcing bars gripped by the first reinforcing bar gripping device and the other reinforcing bar gripped by the second reinforcing bar gripping device are such that a pressing cylinder attached to one end of the large-diameter tubular member replaces the small-diameter tubular member. The rebar holding device for gas pressure welding according to any one of claims 1 to 4, characterized in that they are separated from each other by being driven in the axial direction.   One of the reinforcing bars gripped by the first reinforcing bar gripping device and the other reinforcing bar gripped by the second reinforcing bar gripping device are such that a pressing cylinder attached to one end of the large-diameter tubular member replaces the small-diameter tubular member. The first rebar gripping device is rotated relative to the large-diameter tubular member in a state where they are separated from each other by being driven in the axial direction, and thereby centering is performed mutually. The reinforcing bar holding device for gas pressure welding according to any one of claims 1 to 5.

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