WO2021054187A1 - 鉄筋用圧接治具 - Google Patents

鉄筋用圧接治具 Download PDF

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Publication number
WO2021054187A1
WO2021054187A1 PCT/JP2020/033845 JP2020033845W WO2021054187A1 WO 2021054187 A1 WO2021054187 A1 WO 2021054187A1 JP 2020033845 W JP2020033845 W JP 2020033845W WO 2021054187 A1 WO2021054187 A1 WO 2021054187A1
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WO
WIPO (PCT)
Prior art keywords
reinforcing bars
pressure welding
pressure
outer diameter
welding
Prior art date
Application number
PCT/JP2020/033845
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English (en)
French (fr)
Japanese (ja)
Inventor
成行 林
Original Assignee
成行 林
株式会社アイ・エフ・プランニング
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 成行 林, 株式会社アイ・エフ・プランニング filed Critical 成行 林
Publication of WO2021054187A1 publication Critical patent/WO2021054187A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing

Definitions

  • the present invention relates to a pressure welding jig for reinforcing bars used in a pressure welding method for connecting various reinforcing bars embedded in concrete.
  • the gas pressure welding method is widely adopted at construction sites and the like as a method of axially connecting various reinforcing bars to be embedded in columns and beams of a concrete structure.
  • the gas pressure welding method of the reinforcing bars is a heating process in which the connecting side ends of both reinforcing bars are abutted and heated while the reinforcing bars to be connected to each other are held coaxially, and axial pressure is applied to both reinforcing bars after the heating process. It is carried out by a pressure welding step of joining the connecting side ends of both reinforcing bars.
  • one of the reinforcing bars to be connected to each other is formed in advance with a tubular shape and an inner diameter of the middle portion larger than the reinforcing bar insertion holes at both ends.
  • the connecting covering member is fitted on the outside, and axial pressure is applied to both reinforcing bars while the connecting covering member is moved to a position that covers the connecting side ends of both reinforcing bars. Therefore, a method has been proposed in which the connecting end portions of both reinforcing bars are joined to each other and the joint portion is expanded outward in the radial direction to fill the inside of the connecting covering member (see, for example, Patent Document 1). ..
  • connection covering member consumes the connection covering member each time the reinforcing bars are connected, so that there is a problem that the cost of the pressure welding work increases. Further, the joint portion of the connected reinforcing bar is covered with the connecting covering member, and the quality of the joint state cannot be visually confirmed from the outside. Furthermore, since the outer diameter of the joint is larger than before by the amount of the connecting covering member, it may be difficult to move the hoop muscles and stirrup muscles during the reinforcement work, which may lead to a decrease in workability. is there.
  • the present inventor performs a pressure welding process using a tubular outer diameter regulating metal fitting instead of the above-mentioned connecting covering member after the heating process, and obtains the outer diameter regulating metal fitting.
  • a method of removing from the connected reinforcing bar after the pressure welding process is completed see Patent Document 2. According to this method, since the outer diameter regulating metal fitting can be used repeatedly, the cost of the pressure welding work can be suppressed as compared with the case where the conventional connecting covering member is used.
  • the joint portion of the connected reinforcing bar can be visually confirmed after removing the outer diameter regulating metal fitting, the reliability of the joint strength can be ensured, and the joint portion is outside the joint portion as compared with the case where the connecting covering member is used. Since the expansion of the diameter is suppressed, it becomes easy to handle during the bar arrangement work.
  • the tubular outer diameter regulating metal fitting has a structure that can be divided into two along the axial direction, and the outer fitting to one of the reinforcing bars to be connected to each other and the reinforcing bar after the pressure welding process is completed. It can be freely removed from.
  • the outer diameter regulating metal fittings are divided into a pair of half-split cylinders, and plate-shaped mounting portions extending radially outward are provided at both ends in the circumferential direction of each half-split cylinder, and each half-split cylinder has a plate shape.
  • the structure is such that the mounting portions are connected to each other with bolts and nuts while facing each other, and a handle is provided on the plate-shaped mounting portion at one end in the circumferential direction of one of the half-split cylinders.
  • the outer diameter regulating metal fittings used in this pressure welding method need to loosen or tighten the bolt-nut connection when attaching to one of the reinforcing bars to be connected and when removing from the connected reinforcing bars after the pressure welding process is completed. ..
  • the installation and removal of the outer diameter regulating metal fittings are extremely troublesome for the operator, which is one of the factors that reduce the efficiency of the entire pressure welding operation.
  • the pressure welding work can be efficiently performed at low cost while ensuring the reliability of the joint strength of the reinforcing bars and suppressing the expansion of the outer diameter of the joint portion.
  • the task is to do.
  • the present invention holds the reinforcing bars to be connected to each other coaxially, abuts the connecting side ends of the two reinforcing bars to heat them, and then applies axial pressure to both reinforcing bars.
  • a reinforcing bar pressure welding jig used for a reinforcing bar pressure welding method for connecting both reinforcing bars
  • a C-shaped outer diameter regulating portion having an opening wider than the outer diameter of the reinforcing bar at one position in the circumferential direction and the outer diameter It consists of a handle that extends parallel to the radial direction from the outer circumference of the regulating portion, and the outer diameter regulating portion joins the connecting side ends of both reinforcing bars when axial pressure is applied to both reinforcing bars.
  • a configuration is adopted in which the portion is held on the radial outside of the portion to regulate the expansion of the diameter of the joint portion.
  • the axial pressure is applied to both the reinforcing bars in the pressure welding step of the present invention.
  • the outer diameter regulating portion of the pressure welding jig for reinforcing bars (hereinafter, also simply referred to as “pressure welding jig”) is held on the radial outside of the connection side end of both reinforcing bars to regulate the expansion of the diameter of the joint portion of both reinforcing bars.
  • the reliability of the joining strength of the connected reinforcing bars is ensured as in the case of using the above-mentioned outer diameter regulating metal fittings.
  • the expansion of the outer diameter of the joint can be suppressed, and the cost of pressure welding work can also be suppressed.
  • the outer diameter regulating portion of the pressure welding jig of the present invention is formed in a C shape having an opening wider than the outer diameter of the reinforcing bar, it is easy from the side of the reinforcing bar before the pressure welding process. It can be externally fitted to the reinforcing bar, and even after the pressure welding process is completed, it can be easily removed to the side of the reinforcing bar by sliding it in the axial direction from the joint of the reinforcing bar. Efficiency can be improved.
  • the pressure welding jig slides in the axial direction from the joint portion of the reinforcing bar after the pressure welding process is completed. This makes it easier to remove the pressure welding jig.
  • the pressure welding jig for reinforcing bars of the present invention has a C-shaped outer diameter regulating portion having an opening wider than the outer diameter of the reinforcing bars to be connected to each other. In some cases, it can be easily fitted to the reinforcing bar from the side thereof, and can be easily removed from the connected reinforcing bar after the pressure welding process is completed. That is, in the pressure welding method of the reinforcing bar, by using the pressure welding jig of the present invention, the pressure welding work can be efficiently performed at low cost while ensuring the reliability of the joint strength of the reinforcing bar and suppressing the expansion of the outer diameter of the joint portion. Will be.
  • FIG. Sectional view taken along line III-III of FIG. The front view which shows the heating process in the pressure welding method of the reinforcing bar using the pressure welding jig of FIG.
  • Front view showing the outer fitting state of the pressure welding jig to the reinforcing bar before the start of the pressure welding process.
  • Front view showing a pressure welding process using a pressure welding jig
  • Front view showing the process of removing the pressure welding jig after the pressure welding process is completed.
  • the pressure welding jig 1 for reinforcing bars has a C-shaped outer diameter having an opening 2a wider than the outer diameter of the reinforcing bar B to be connected at one position in the circumferential direction. It is composed of a regulating portion 2 and a rod-shaped handle 3 extending in parallel with the radial direction from the outer circumference of the outer diameter regulating portion 2.
  • the inner peripheral surface of the outer diameter regulating portion 2 is a tapered surface 2b in which one end side portion in the axial direction expands toward one end, and a large number of axial grooves 2c are formed in the tapered surface 2b.
  • the opening 2a of the outer diameter regulating portion 2 extends with a constant width in the axial direction, and both side walls thereof are flat surfaces without axial grooves.
  • the straight portion on the other end side in the axial direction is formed to have the same size as the width of the opening 2a, and the maximum diameter of the tapered surface 2b (inner diameter at one end) is 1 of the outer diameter of the reinforcing bar B. It is formed around 1 to 1.3 times, preferably around 1.2 times.
  • the pressure welding jig has an inner diameter corresponding to the outer diameter of each of these reinforcing bars. It is sufficient to prepare a plurality of the reinforcing bars and use the one corresponding to the reinforcing bar to be actually connected.
  • the gas pressure welding device has a fixed clamp that detachably fixes one reinforcing bar to the outside of one end side of the outer cylinder that is the main body of the pressure welding device, and the other reinforcing bar that is detachably fixed to the outside of the other end side.
  • the moving clamp is provided with a moving clamp to be moved and an inner cylinder housed inside the outer cylinder so as to be movable in the axial direction.
  • the moving clamp is fixed by pushing the inner cylinder with a hydraulic cylinder connected to the other end of the outer cylinder. It has a structure that brings it closer to the clamp.
  • the connecting side ends of the reinforcing bars B and B to be connected are cut in advance with a reinforcing bar cold right-angle cutting machine or the end faces are ground to make a smooth surface. Then, first, one reinforcing bar B is fixed to the fixing clamp of the gas pressure welding device with a tightening bolt, the other reinforcing bar B is fixed to the moving clamp with a tightening bolt, both reinforcing bars B and B are held coaxially, and both are held by a burner.
  • a heating step is performed to heat the connecting side ends of the reinforcing bars B and B.
  • Acetylene gas, oxygen gas, natural gas, hydrogen gas, etc. are used for heating with a burner. It should be noted that high frequency heating can be adopted instead of the burner heating.
  • the heating steps include a first heating step in which the connecting side ends of both reinforcing bars B and B are close to each other, and as shown in FIG. 4, the connecting side ends of both reinforcing bars B and B after the first heating step. It consists of a second heating step in which the portions are butted against each other and heated in a state where axial pressure is applied to both reinforcing bars B and B.
  • the heating range of the connecting side ends of the two reinforcing bars B and B is a range from the end faces of the reinforcing bars B and B to a length of about 0.15 to 0.3 times the outer diameter of the reinforcing bars B.
  • the connecting side ends of the two reinforcing bars B and B that are butted against each other are slightly expanded (diameter expanded) outward in the radial direction due to the axial pressure.
  • the pressure welding process using the pressure welding jig 1 is performed.
  • this pressure welding step first, as shown in FIG. 5, the outer diameter regulating portion 2 of the pressure welding jig 1 is externally fitted from the side of the reinforcing bar B at a position near the connection side end portion of one of the reinforcing bars B (FIG. 1). (See), the outer diameter regulating portion 2 is slid toward the connecting side ends of both reinforcing bars B and B.
  • the pressure applied to the hydraulic cylinder of the gas pressure welding device is applied while the outer diameter regulating portion 2 of the pressure welding jig 1 is held on the radial outside of the connecting side ends of both reinforcing bars B and B.
  • the connecting side ends of both reinforcing bars B and B are joined to connect both reinforcing bars B and B.
  • the outer diameter regulating portion 2 of the pressure welding jig 1 held on the radial outside of the joint portion regulates the diameter expansion of the joint portion, the diameter-expanded portions of the joint portion pressurize each other in the axial direction.
  • the pressure welding jig 1 When the pressure welding process is completed, the supply of flood pressure to the hydraulic cylinder of the gas pressure welding device is stopped, and as shown in FIG. 7, the outer diameter regulating portion 2 of the pressure welding jig 1 is slid toward one of the reinforcing bars B. After pulling it away from the joint of the reinforcing bars B and B, it may be removed to the side of one of the reinforcing bars B (see FIG. 1). At this time, the pressure welding jig 1 has a tapered surface 2b in which the portion of the inner peripheral surface of the outer diameter regulating portion 2 that regulates the diameter expansion of the joint portion of both reinforcing bars B and B expands toward one end. , Can be easily removed by sliding from the joint. Then, after removing the pressure welding jig 1, the entire pressure welding operation is completed by visually checking the joint state of the jointed portions of the connected reinforcing bars B and B.
  • the pressure welding method using the pressure welding jig 1 after performing the heating step, axial pressure is applied to both reinforcing bars B and B to join the connecting side ends of both reinforcing bars B and B.
  • the outer diameter regulating portion 2 of the pressure welding jig 1 is held outside the joint in the radial direction to regulate the expansion of the diameter of the joint, and the pressure welding jig 1 is removed after the pressure welding process is completed.
  • the strength of the joint portion of both reinforcing bars B and B can be increased by the forging effect, and the cost of the pressure welding work can be suppressed by repeatedly using the pressure welding jig 1.
  • the joints of the connected reinforcing bars B and B can be visually confirmed after the pressure welding jig 1 is removed, the reliability of the joint strength can be ensured and the expansion of the outer diameter of the joint can be suppressed, so that the reinforcing bars are arranged. It will be easy to handle during work.
  • the pressure welding jig 1 has an opening 2a in which the outer diameter regulating portion 2 is wider than the outer diameter of the reinforcing bar B, and can be easily fitted to the reinforcing bar B from the side immediately before the pressure welding process. After the pressure welding process is completed, the reinforcing bars B and B can be easily removed, so that the workability of the entire pressure welding operation can be improved.
  • FIG. 8 is a view of the reinforcing bars B and B after the pressure welding jig 1 is removed from the back surface side (the side opposite to the side facing the opening 2a of the outer diameter regulating portion 2 of the pressure welding jig 1). is there.
  • a plurality of streaky indentations A extending in the axial direction are formed at the joints of the connected reinforcing bars B and B.
  • the joint portion surrounded by the outer diameter regulating portion 2 of the pressure welding jig 1 in the pressure welding process is a convex portion between the axial grooves 2c on the inner peripheral surface of the outer diameter regulating portion 2. It is formed by being pressed against.
  • the reinforcing bar is the pressure welding jig of the present invention. It can be estimated that they are connected using the above, that is, they have sufficient joint strength.
  • the appearance of the joint for determining the connection method of the reinforcing bar is not limited to the streak-shaped indentation as described above.
  • the inner peripheral surface of the outer diameter regulating portion of the pressure welding jig may be a regular hexagon or a regular octagon.
  • the entire joint portion of the reinforcing bar may be formed into a substantially polygonal shape.
  • the inner peripheral surface of the outer diameter regulating portion of the pressure welding jig is a tapered surface as in the embodiment because the pressure welding jig can be easily removed after the pressure welding process. It can also be a straight cylindrical surface. Further, the axial groove on the inner peripheral surface of the outer diameter regulating portion can be omitted.
  • the pressure welding jig of the present invention is intended for pressure welding of reinforcing bars, it can also be used for pressure welding of rod-shaped members, tubular members, etc. other than reinforcing bars.
PCT/JP2020/033845 2019-09-17 2020-09-07 鉄筋用圧接治具 WO2021054187A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-168328 2019-09-17
JP2019168328A JP7282641B2 (ja) 2019-09-17 2019-09-17 鉄筋用圧接治具

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WO2021054187A1 true WO2021054187A1 (ja) 2021-03-25

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10175080A (ja) * 1996-12-13 1998-06-30 Yasuo Shirokura 棒状体の接合工法
JP2013066927A (ja) * 2011-09-26 2013-04-18 Shigeyuki Hayashi 鉄筋の圧接方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4938859A (zh) * 1972-08-17 1974-04-11
JP2001355314A (ja) 2000-04-13 2001-12-26 Shigeyuki Hayashi 鉄筋の接続方法
WO2008074147A1 (en) 2006-12-21 2008-06-26 Icera Canada ULC Edge power ramp using logarithmic resistor attenuator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10175080A (ja) * 1996-12-13 1998-06-30 Yasuo Shirokura 棒状体の接合工法
JP2013066927A (ja) * 2011-09-26 2013-04-18 Shigeyuki Hayashi 鉄筋の圧接方法

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TW202117147A (zh) 2021-05-01
JP2021045760A (ja) 2021-03-25

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