JP3146837U - Rebar holding device for gas pressure welding - Google Patents

Abstract

An object of the present invention is to provide a gas pressure welding reinforcing bar holding device capable of being pressure welded by fixing both ends of an annularly formed hoop muscle in a state of abutting each other.
The gripping directions H of the reinforcing bar receiving portions of the reinforcing bar gripping devices 26 and 28 intersect each other on the large-diameter tubular member 22 side between the reinforcing bar gripping devices 26 and 28 with respect to the gripping position of the reinforcing bar gripping devices 26 and 28. As described above, since the gripping direction H of the reinforcing bar gripping devices 26 and 28 is inclined, the reinforcing bar gripping devices 26 and 28 can stably and strongly grip the both end portions 12a and 12b of the hoop bars. The pressing cylinder 16 attached to the other end of the large-diameter tubular member 22 with the both ends of the hoop muscles butting each other drives the small-diameter tubular member 24 in the axial direction, so that both ends 12a are pressed during gas pressure welding. And 12b can be fixed in pressure contact with each other, and a stable bonding strength can be obtained.
[Selection] Figure 2

Description

  The present invention relates to a gas pressure welding reinforcing bar holding device for holding a pair of reinforcing bars in a state of abutting each other at the time of gas pressure welding, and in particular, both ends for pressure welding both ends of an annularly bent reinforcing bar. The present invention relates to a rebar holding device for gas pressure welding for holding the parts in a state of abutting each other.

  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 in a red-heated state until a large-diameter bulge is formed, and this state is maintained. In order to perform gas pressure welding to join, the ends of the pair of reinforcing bars are fixed in a state where they are in contact with each other.

  At a construction site, a plurality of reinforcing bars (main bars) are each 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, a square frame shape 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 implementation and reduce the number of workers and the work range, a plurality of reinforcing bars (main bars) are connected to a cage-like reinforcing bar unit so as to have a shape corresponding to the pillar or beam. As shown, the hoop and wire are pre-assembled at another work place, and then the cage-like reinforcing bar unit is moved to a predetermined position by a crane, as in the case of steel frame assembly. Enforcement method to bury in is carried out.
Japanese Patent No. 3498046

  By the way, as described above, the reinforcing bars, that is, the hoop bars, which are curved in an annular shape so as to have a diameter of about 1.5 m, for example, are provided around the plurality of reinforcing bars (main bars) of the cage-like reinforcing bar unit assembled in advance. There are cases where a plurality of reinforcing bar units are arranged at predetermined intervals in the longitudinal direction, and both ends of the hoop bars are joined to each other. For example, a pre-assembled reinforcing bar for a pillar. In order to join both ends of the hoop muscle, a portion where the both ends of the hoop muscle are overlapped by about 50 cm was joined by arc welding. However, the joining by arc welding has the disadvantage that stable working strength cannot be obtained because the working conditions are unstable and skill is required, and the strength is large and the variation is large. On the other hand, when the reinforcing bar holding device for gas pressure welding described in the above-mentioned Patent Document 1 is used, both ends of the hoop bar cannot be stably gripped, the mutual pressing cannot be performed well, and the pressure welding is not performed. It was difficult.

  The present invention has been made in the background of the above circumstances, and the object of the present invention is to provide a gas pressure welding reinforcing bar holding device capable of pressure-welding both ends of an annularly bent reinforcing bar, that is, a hoop. It is to provide.

  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 and a first rebar grip for gripping one end of both ends of a rebar that is provided at one end of the large-diameter tubular member and is annularly bent And a second rebar gripping device for gripping the other end of the annularly bent reinforcing bars integrally fixed to the small diameter tubular member, the first rebar A pressing cylinder mounted on the other end of the large-diameter tubular member in a state in which one end gripped by the reinforcing bar gripping device and the other end gripped by the second reinforcing bar gripping device are butted against each other; By driving the small-diameter tubular member in the axial direction, Reinforcing bar holding device for gas pressure welding that fixes the part and the other end in a pressure-welded state to each other, wherein (b) the first reinforcing bar gripping device and the second reinforcing bar gripping device have a concave groove shape for receiving the reinforcing bar And (c) the first reinforcing bar, each having a reinforcing bar receiving part having a receiving surface and a screwing part into which a fastening member that faces the reinforcing bar receiving part and is screwed toward the reinforcing bar receiving part is screwed. The gripping direction of the reinforcing bar receiving part of the gripping device and the gripping direction of the reinforcing bar receiving part of the second reinforcing bar gripping apparatus are determined between the first reinforcing bar gripping apparatus and the second reinforcing bar gripping apparatus and the second reinforcing bar gripping apparatus. The gripping directions of the first reinforcing bar gripping device and the second reinforcing bar gripping device are inclined with respect to the axis of the large diameter tubular member so as to intersect on the large diameter tubular member side with respect to the gripping position of the reinforcing bar gripping device. There is in being.

  Further, the gist of the device according to claim 2 is that, in the device according to claim 1, (d) the reinforcing bar receiving portion of the first reinforcing bar gripping device and the second reinforcing bar gripping device is formed therein. Each of the receiving plates is fixed so as to close the longitudinal groove-shaped receiving surface.

  The gist of the invention according to claim 3 is that, in the invention according to claim 1 or 2, the gripping direction of the first reinforcing bar gripping device and the second reinforcing bar gripping device is the axis of the large-diameter tubular member. In other words, it is inclined at an angle of 10 to 20 degrees.

  According to the reinforcing bar holding device for gas pressure welding according to claim 1, the first reinforcing bar holding device and the second reinforcing bar holding device include a reinforcing bar receiving portion having a concave groove-shaped receiving surface for receiving the reinforcing bar, A fastening member that is screwed with a fastening member that opposes the reinforcing bar receiving part and is screwed toward the reinforcing bar receiving part, and a gripping direction of the reinforcing bar receiving part of the first reinforcing bar gripping device and the second reinforcing member. The gripping direction of the reinforcing bar receiving portion of the reinforcing bar gripping device is larger than the gripping position of the first reinforcing bar gripping device and the second reinforcing bar gripping device between the first reinforcing bar gripping device and the second reinforcing bar gripping device. Since the gripping directions of the first reinforcing bar gripping device and the second reinforcing bar gripping device are inclined with respect to the axis of the large-diameter tubular member so as to intersect on the side, the first reinforcing bar gripping device and the first reinforcing bar gripping device 2 Rebar gripping device is an annularly bent rebar, Since both ends of the looped muscle can be stably and strongly gripped, a pressing cylinder attached to the other end of the large-diameter tubular member in a state where both ends of the hoops are in contact with each other is provided with the small-diameter tubular By driving the member in the axial direction, both end portions can be fixed to each other in a pressure contact state during gas pressure, and a stable joint strength can be obtained. Moreover, since the dimension for overlapping the both ends of the hoop is not required, the reinforcing bars can be saved.

  Further, according to the reinforcing bar holding device for gas pressure welding according to claim 2, the reinforcing bar receiving portion of the first reinforcing bar holding device and the second reinforcing bar holding device has a longitudinal groove-shaped receiving surface formed thereon. Since the receiving plates are fixed so as to close each other, the contact area between the both ends of the annularly bent reinforcing bars, that is, the hoop muscles, and the receiving plates that receive them is enlarged. The second reinforcing bar gripping device can grip both ends of the rebar, that is, the hoop bar, which is formed in an annular shape, more stably with high gripping strength, and gas pressure welding is further facilitated.

  According to the reinforcing bar holding device for gas pressure welding according to claim 3, the holding direction of the first reinforcing bar holding device and the second reinforcing bar holding device is 10 to 20 degrees with respect to the axis of the large-diameter tubular member. Since the first reinforcing bar gripping device and the second reinforcing bar gripping device can stably and strongly hold both ends of the annularly bent reinforcing bar, that is, the hoop bar, A pressing cylinder attached to the other end of the large-diameter tubular member in a state where both ends of the hoop muscles are in contact with each other drives the small-diameter tubular member in the axial direction, thereby causing the ends to cross each other during gas pressure. Can be fixed in a pressure contact state.

  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, for example, both ends 12a and 12b of a reinforcing bar, that is, a hoop bar 12 that is formed in an annular shape having a diameter of about 1.5 m. FIG. 1 shows a gas pressure welding reinforcing bar holding device 10 that is cut at a right angle to an axis and held in a state of being abutted against each other so that the axes of the end faces of both end portions 12a and 12b coincide with each other. As shown in detail in FIG. 2, the gas pressure welding reinforcing bar holding device 10 is a single-acting hydraulic cylinder that uses a hydraulic pressure to generate a pressing force in a direction in which both end portions 12 a and 12 b of the hoop bar 12 are pressed against each other. (Pressing cylinder) 16 is a large-diameter sleeve 22 and a small-diameter tubular member, which are concentric with each other by being fitted to the axial center 16 so as to be relatively movable in the axial direction and relatively rotatable around the axial center. A small-diameter sleeve 24, a spring 20 that is inserted into the large-diameter sleeve 22 and urges the small-diameter sleeve 24 toward the hydraulic cylinder 16, and a first rebar gripping device 26 fixed to one end of the large-diameter sleeve 22. And a second rebar gripping device 28 integrally fixed to the small diameter sleeve 24, and the hydraulic cylinder 16 mounted and fixed to the end of the large diameter sleeve 22 drives the small diameter sleeve 24. And it is made to move relatively in the axial direction.

  The first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 are for fixing both end portions 12a and 12b of the hoop muscle 12 in the gripping state, and are configured in the same manner as shown in FIG. The second rebar gripping device 28 fixed to the small diameter sleeve 24 will be described exclusively with reference to FIG.

  3 and 4, the second reinforcing bar gripping device 28 is branched in a C-shape at the end of the small-diameter sleeve 24 extending in a direction orthogonal to the longitudinal direction, and at the tip of the arm 32. A pair of screwed portions 34, a reinforcing bar receiving portion 36 integrally connected to the screwed portion 34 via the connecting portion 35 in a state of facing the screwed portion 34, and one screwed portion 34. A fastening bolt 38 which is a screwed fastening member is provided. A receiving surface 40 having a long groove shape such as a concave groove shape or a V groove shape is formed on a portion of the reinforcing bar receiving portion 36 facing the screwing portion 34, and the long concave groove shape or the long V groove shape is formed. Flat receiving plates 30 are fixed so as to close the opening of the receiving surface 40. Between the screwing part 34 and the reinforcing bar receiving part 36, the end 12b of the hoop bar 12 is a reinforcing bolt 38 that is pressed from a direction orthogonal to the longitudinal direction thereof, and the reinforcing bar so as to face the clamping bolt 38. It is sandwiched between a receiving plate 30 fixed to a receiving surface 40 having a concave groove shape or a V groove shape provided in the receiving portion 36.

  Since the receiving surface 40 is formed in a longitudinal groove shape such as a concave groove shape or a V-groove shape, the gripping direction of the portion of the first rebar gripping device 26 and the second rebar gripping device 28 that grips the hoop muscle 12, That is, the longitudinal direction H of the formation of the receiving surface 40 of the first rebar gripping device 26 and the second rebar gripping device 28 is between the first rebar gripping device 26 and the second rebar gripping device 28, and Inclined at a predetermined angle θ, for example, an angle of about 10 degrees to 20 degrees with respect to the axis C of the large diameter tubular member 22 so as to intersect the large diameter tubular member 22 side with respect to the grasping position of the second reinforcing bar grasping device 28 It has been made. A point P in FIG. 2 indicates an intersection between the gripping direction H of the reinforcing bar receiving portion 36 of the first reinforcing bar gripping device 26 and the gripping direction H of the reinforcing bar receiving portion 36 of the second reinforcing bar gripping device 28.

  FIG. 3 is a side view of FIG. 1 with a part cut away to explain the configuration of the second rebar gripping device 28, and the tightening bolt 38 is moved to a position where the end 12 b of the hoop bar 12 is fixed. It shows the state of moving forward. FIG. 4 is a side view similar to FIG. 3, but from the opening A between the threaded portion 34 of the second reinforcing bar gripping device 28 and the reinforcing bar receiving portion 36 connected thereto via the connecting portion 35. 12 shows a state in which the tightening bolt 38 is moved backward or backward to a position where the tightening bolt 38 abuts the screwed portion 34 when the end portion 12b of the twelve ends 12b 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 direction of the axis C 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 determined by a pair of position adjusting bolts 46 screwed to both ends of the C-shaped ring member 44 having the above-described notch, and both ends 12a and 12b of the hoop bar 12. Are adjusted so that their end faces are positioned substantially concentrically.

  As shown in FIG. 5, the clamping bolt 38 includes a head 50 having a regular hexagonal cross section at the base end, a male screw 52 formed on the outer peripheral surface, and a fitting hole 54 formed on the distal end surface. 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 into the fitting hole 54 of the bolt body 58 so as to be relatively rotatable. ing. The pressing member 60 protrudes from a rectangular plate-like pressing plate portion 64 having a pressing surface 62 on both ends 12a or 12b side of the hoop muscle 12, 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 in which 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 direction of the axis J is formed so as to intersect the center of the bolt body 58, 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. And a center hole 78 in which the needle member 76 is accommodated so as to be movable in the axial center J direction. 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 J.

  Returning to FIG. 2, the large-diameter sleeves 22 are integrally provided by screwing a mounting device 86 for mounting the hydraulic cylinder 16 at one end. The mounting device 86 has a short tubular shape with a diameter larger than that of the large-diameter sleeve 22, and has an L shape penetrating in the thickness direction so as to receive the engaging protrusion 16 p protruding in the outer diameter direction at the distal end portion of the hydraulic cylinder 16. Each has a notch 88 in the mold. The L-shaped notch 88 includes an axial portion 90 that extends in a direction parallel to the axis C and opens at an end face, and a circumferential portion 92 that extends in the circumferential direction from the end of the axial portion 90. ing. With the engaging projection 16p of the hydraulic cylinder 16 being inserted into the axial portion 90, the tip of the hydraulic cylinder 16 is fitted into the opening of the mounting device 86 and pushed in, so that the engaging projection 16p becomes the axial portion 90. 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 C in a state where the hydraulic cylinder 16 is reached. ing. Abutting members 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.

  Using the gas pressure welding reinforcing bar holding device 10 configured as described above, for example, at a predetermined position on the outer periphery of a reinforcing bar unit that is bent in an annular shape to have a diameter of about 1.5 m and assembled in a cage shape. The case where the both ends 12a and 12b of the arranged reinforcing bar, that is, the hoop bar 12 are gas-welded to each other will be described with reference to FIGS.

  First, the press-contact reinforcing bar holding device 10 in which the hydraulic cylinder 16 is mounted on the mounting device 86 on one end side (the right end side in the drawing) of the large-diameter sleeve 22 and the tightening bolt 38 and the position adjusting bolt 46 are loosened. The tightening bolt 38 is prepared and the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 of the gas pressure welding reinforcing bar holding device 10 receive both ends 12a and 12b of the hoop bar 12 in the opening A. Are tightened, and the position adjusting bolt 46 is tightened. The gripping positions of both end portions 12a and 12b of these hoop muscles 12 are determined at a predetermined distance from the end surfaces of both end portions 12a and 12b of the pair of hoop muscles 12. FIG. 6 shows this state. In this state, both ends 12a and 12b of the pair of hoop muscles 12 are hardly separated in the direction of the axis C, but may be displaced in a direction perpendicular to the direction of the axis C. In this case, the first rebar gripping device 26 and the second rebar gripping device 28 adjust the end faces of the both ends 12a and 12b of the hoop bar 12 while correcting using a deviation correction tool, for example, a vise 98. Both end portions 12a and 12b of the hoop muscle 12 are gripped.

  Next, the hydraulic cylinder 16 is driven, the piston rod 16b is protruded to move the small diameter sleeve 24 and the second reinforcing bar gripping device 28 fixed thereto to the end 12a side, and the end surfaces of the pair of ends 12a and 12b are moved. Contact with a predetermined pressing force without a gap. FIG. 2 shows this state. In this state, when both end portions 12a and 12b of the hoop muscle 12 are heated red using a pressure welding burner (not shown), the ball bulges as shown in FIG. 7, and the heating by the pressure welding burner is stopped. The joining of the pair of end portions 12a and 12b is completed. The bulging portion B formed by this pressure contact has a diameter of about 1.1 to 1.3 times the diameter of the hoop muscle 12.

  As described above, according to the reinforcing bar holding device 10 for gas pressure welding of the present embodiment, the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 are longitudinal grooves for receiving both end portions 12a and 12b of the hoop bar 12. A rebar receiving portion 36 having a ring-shaped receiving surface 40, and a screw engaging portion 34 into which a tightening bolt 38 (a tightening member) that faces the rebar receiving portion 36 and advances toward the rebar receiving portion 36 is screwed. And the gripping direction H of the reinforcing bar receiving portion 36 of the first reinforcing bar gripping device 26 and the gripping direction H of the reinforcing bar receiving portion 36 of the second reinforcing bar gripping device 28 correspond to the first reinforcing bar gripping device 26 and the second reinforcing bar. Between the gripping devices 28, the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 cross each other on the large-diameter tubular member 22 side with respect to the gripping position of the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28. The gripping direction H of the tube is large-diameter tubular Since the first rebar gripping device 26 and the second rebar gripping device 28 can stably and strongly grip the both end portions 12a and 12b of the hoop bar 12 because they are inclined with respect to the axis C of the member 22. Therefore, the pressure cylinder 16 attached to the other end of the large-diameter tubular member 22 with the both ends of the hoop muscles 12 butting each other drives the small-diameter tubular member 24 in the axial direction. In this case, the both end portions 12a and 12b can be fixed to each other in a pressure contact state, and a stable bonding strength can be obtained. Moreover, since the dimension for overlapping the both ends 12a and 12b of the hoop muscle 12 becomes unnecessary, the hoop muscle 12 can be saved.

  Further, according to the gas pressure welding reinforcing bar holding device 10 of the present embodiment, the reinforcing bar receiving portion 36 of the first reinforcing bar gripping device 26 and the second reinforcing bar gripping device 28 has a longitudinal groove-shaped receiving surface 40 formed thereon. Since the flat receiving plate 30 is fixed so as to block the both ends 12a and 12b of the hoop muscle 12 bent in an annular shape, and the contact area between the receiving plate 30 receiving them is expanded, The first rebar gripping device 26 and the second rebar gripping device 28 can grip the both end portions 12a and 12b of the hoop muscle 12 formed in an annular shape more stably with high grip strength, and gas pressure welding is easier. It becomes.

  Further, according to the reinforcing bar holding device 10 for gas pressure welding of the present embodiment, the holding direction H of the first reinforcing bar holding device 26 and the second reinforcing bar holding device 28 is 10 to 20 with respect to the axis C of the large-diameter tubular member 22. Since the first rebar gripping device 26 and the second rebar gripping device 28 are inclined at an angle of degrees, the both ends 12a and 12b of the rebar, that is, the hoop muscle 12 bent in an annular shape are stably and strongly gripped. Therefore, the pressing cylinder 16 attached to the other end of the large-diameter tubular member 22 in a state where both ends 12a and 12b of the hoop muscles 12 are in contact with each other causes the small-diameter tubular member 24 to move in the direction of the axis C. By driving, both end portions 12a and 12b can be fixed to each other in a pressure contact state during gas pressure.

  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 mounting device 86 fixed to the other end portion of the large-diameter sleeve member 22 includes a short cylindrical member and an L-shaped notch 88 formed on the short cylindrical member. The hydraulic cylinder 16 is mounted by engaging the distal end portion of the hydraulic cylinder 16 with the L-shaped notch 88, but the mounting device 86 for mounting the hydraulic cylinder 16 is the distal end of the hydraulic cylinder 16. Other mounting structures such as a structure in which the parts are screwed together or a structure in which the tip of the hydraulic cylinder 16 is mounted by bolting may be provided.

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

It is a front view which shows the state which the rebar holding apparatus for gas pressure welding of one Example of this invention hold | gripped the both ends of the hoop reinforcement, respectively. It is the front view which notched a part which shows the reinforcing bar holding apparatus for gas pressure welding of the Example of FIG. 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 in order to explain the configuration of the reinforcing bar gripping device of FIG. 1, and a reinforcing bar receiving unit connected to the reinforcing bar gripping device via a screwing part and a connecting part; It shows 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 between the two. 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 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 each gripped the both ends of the hoop, and the vise which correct | amends the shift | offset | difference of those both ends. 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 pressure-welded in the state which faced each other.

Explanation of symbols

10: Reinforcing bar holding device for gas pressure welding 12: Hoop bar (reinforcing bar)
12a: end, 12b: end 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 30: receiving plate 34: screwing part 36: reinforcing bar receiving part 38: tightening bolt (clamping member)
40: receiving surface H: gripping direction P: intersection

Claims (3)

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 end of both ends of the annularly bent reinforcing bar, and the annularly bent reinforcing bar integrally fixed to the small-diameter tubular member. A second rebar gripping device for gripping the other end of both ends, and one end gripped by the first rebar gripping device and the other rebar gripped by the second rebar gripping device A pressing cylinder attached to the other end of the large-diameter tubular member in a state in which the ends are abutted against each other drives the small-diameter tubular member in the axial direction, so that the one end and the other in the event of gas pressure Rebar holding device for gas pressure welding Te,
The first reinforcing bar gripping device and the second reinforcing bar gripping device have a reinforcing bar receiving part having a concave groove-shaped receiving surface for receiving the reinforcing bar, and are screwed toward the reinforcing bar receiving part so as to face the reinforcing bar receiving part. Each including a screwing portion into which a tightening member is screwed,
The gripping direction of the reinforcing bar receiving portion of the first reinforcing bar gripping device and the gripping direction of the reinforcing bar receiving portion of the second reinforcing bar gripping device are determined by the first reinforcing bar gripping between the first reinforcing bar gripping device and the second reinforcing bar gripping device. The gripping direction of the first reinforcing bar gripping device and the second reinforcing bar gripping device is relative to the axis of the large diameter tubular member so that the gripping position of the first reinforcing bar gripping device and the second reinforcing bar gripping device intersects with the large diameter tubular member side of the gripping position of the device Reinforcing bar holding device for gas pressure welding, characterized in that it is inclined. The receiving plate of each of the first reinforcing bar gripping device and the second reinforcing bar gripping device is fixed to the reinforcing bar receiving portion so as to close the longitudinal groove-shaped receiving surface formed thereon. Rebar holding device for gas pressure welding. The gripping direction of the first reinforcing bar gripping device and the second reinforcing bar gripping device is inclined at an angle of 10 to 20 degrees with respect to the axis of the large-diameter tubular member. Rebar holding device for gas pressure welding.

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