KR20110108582A - Method and machines for bending a shear steel reinforcing bar - Google Patents

Abstract

The present invention relates to a shear reinforcement bending method and a bending device for bending the shear reinforcement used to increase the resistance to the punching shear failure of the slab installed in the slab and column junction in a flat plate structure.
In the bending method of the shear reinforcement according to the present invention, the first curved portion 11 and the second curved portion 12 are connected by a straight portion 13, and the plurality of straight portions 13 are arranged in parallel to each other, reinforcing bars The first and second curved portions 11 and 12 are bent in a zigzag shape, and the first curved portion 11 and the second curved portion 12 are refracted perpendicularly to the straight portion 13. A second bending step of bending to face each other, and a third curved portion 11 and a second curved portion 12 facing each other in a direction opposite to each other and disposed between the first curved portion 11 and the second curved portion 12. It characterized in that it consists of a third bending step for bending the center of the straight portion 13 connecting the first curved portion 11 and the second curved portion 12 so that the curved portion 14 is directed upward.

Description

Shear reinforcement bending method and apparatus {METHOD AND MACHINES FOR BENDING A SHEAR STEEL REINFORCING BAR}

The present invention relates to a method and apparatus for bending a shear reinforcing bar installed in a column joint in a flat plate slab structure.

The shear reinforcement 500 shown in FIG. 11 includes a first vertical portion 503 in which the first curved portion 501 and the second curved portion 502 are disposed in opposite directions, and are refracted and extended from the first curved portion 501. An upper end of the upper end of the second vertical part 504 refracted by the second curved portion 502 is formed in a structure connected by the third curved portion 505.

However, the bending method and the bending device for bending the shear reinforcement as described above are not introduced.

Accordingly, an object of the present invention is a structure in which the first curved portion and the second curved portion are arranged in opposite directions, and the first vertical portion refracted at the first curved portion and the second vertical portion refracted at the second curved portion are connected by the third curved portion. It is to provide a shear reinforcement bending method for bending the shear reinforcement having an economical and efficient.

Another object of the present invention is to provide a shear reinforcement bending device for implementing the shear reinforcement bending method as described above.

Bending method of the shear reinforcement according to the present invention for achieving the above object is the first bend to bend the reinforcing bars in a zigzag form so that the first curved portion and the second curved portion is connected by a straight portion, a plurality of straight portions are arranged in parallel with each other Bending step,

A second bending step of bending the first and second curved portions to face each other such that the first curved portion and the second curved portion are refracted perpendicularly to the straight portion;

Bending the center of the straight portion connecting the first curved portion and the second curved portion such that the first curved portion and the second curved portion face in opposite directions, and the third curved portion disposed between the first curved portion and the second curved portion faces upward. It is characterized by consisting of a third bending step.

In order to implement the above bending method, the bending device used in the first bending step of bending the reinforcing bar in a zigzag form includes a rack gear operated by a first cylinder, a pinion gear interlocked with the rack gear, and the pinion. A shaft in which a gear is mounted, an arm mounted at an upper end of the shaft, a bending pin mounted at a rotational tip of the arm, and a pair of fixed bending jigs disposed at an upper rotation center of the arm, and fixed bending As the bending pins are disposed close to the circular arcs of the jig, the bending pins that rotate each around the circular arcs of the fixed bending jig are zigzag around the circular arcs of the fixed bending jig. It is characterized by bending in the form.

In the shear reinforcement bending device, the fixed bending jig is mounted on the guide member mounted on the table such that the fixed bending jig is disposed on the perforated portion of the table, and the first cylinder and the shaft are disposed inside the table, thereby forming the perforated portion of the table. The bending pin is disposed in the rebar, the reinforcing bar is supplied to the fixed bending jig through the guide roller and the clamping device, and the stopper is mounted on the table by the third cylinder disposed inside the table.

The bending pin is lifted up and down by an air cylinder mounted to the lower surface of the arm.

The stopper may be moved along the long hole of the table, and the width of the first bent rebar is determined by the distance between the stopper and the fixed bending jig.

In the bending device for bending the first curved portion and the second curved portion of the first bent bar at right angles, a pair of bending rollers are disposed on the base, and a plurality of insertion grooves in which the first bent steel bars are disposed on the bending rollers are uniform. Bending punches which are formed at intervals and which are lifted up and down by the gap between the bending rollers are mounted on the movable plate, and the movable plates are lifted up and down along the guide by a cylinder mounted on the upper plate, and the reference plate is mounted on the pedestal of the bending roller. It is characterized by.

The bending device for bending the straight portion of the second bent rebar to the final reinforcement reinforcing bar is a pair of bending rollers are arranged on the base, a plurality of insertion grooves are arranged at a constant interval a plurality of insertion grooves are arranged on the bending rollers A reference plate is mounted on the back plate of the pedestal on which the bending roller is mounted, a support plate is mounted on the back plate of the pedestal on which the bending roller is mounted, and a bending punch is mounted on the movable plate to move up and down the gap between the bending rollers. The movable plate is lifted up and down along the guide by a cylinder mounted to the upper plate, and the pushing device is connected to the pedestal so as to push the pedestal with the bending roller and the pedestal with the bending roller toward the gap.

As a result, the bending method and the bending device of the shear reinforcement according to the present invention has the effect of forming the shear reinforcement economically and efficiently.

1 is a work flow diagram illustrating a process of bending the reinforcing bars by the shear reinforcing bar bending method according to the present invention, (a) is the first bent state, (b) is the second bent state, (c) Is the third bent state.
Figure 2 is a perspective view schematically showing the main portion of the first bending device for bending the primary reinforcement according to the present invention.
Figure 3 is a perspective view showing the overall first bending device for bending the reinforcing bars according to the present invention.
4 is a working process diagram illustrating a process of first bending a reinforcing bar by a first bending device.
5 is a perspective view illustrating a second bending device for second bending the first bent steel according to the present invention.
FIG. 6 is a working flowchart illustrating an example in which rebars primarily bent by a second bending device are secondly bent.
7 is a perspective view illustrating a third bending device for tertiary bending.
8 to 10 are working process diagrams illustrating a process of tertiary bending by the third bending device.
11 is a perspective view of a known shear reinforcement;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, in the shear reinforcement bending method according to the present invention, a first curved portion 11 and a second curved portion 12 are connected by a straight portion 13, and a plurality of straight portions 13 are parallel to each other. In order to be arranged, the first bending step of bending the rebar in a zigzag shape (see FIG. 1A), and the first curved portion 11 and the second curved portion 12 are refracted perpendicularly to the straight portion 13. , The second bending step of bending the first and second curved portions 11 and 12 to face each other (see FIG. 1B) and the first curved portion 11 and the second curved portion 12 in opposite directions. The first curved portion 11 and the second curved portion shown in FIG. 1B so that the third curved portion 14 disposed between the first curved portion 11 and the second curved portion 12 faces upward. 3rd bending step (refer FIG. 1 (c)) which bends the center of the straight part 13 which connects the curved part 12. FIG.

The bending device for bending the shear reinforcement in the same manner as described above will be described with reference to FIGS. 2 to 10.

Referring to FIG. 2, the first bending device 100 used in the first bending step includes a rack gear 112 operated by a first cylinder 111 and a pinion gear interlocked with the rack gear 112. 113, a shaft 114 on which the pinion gear 113 is mounted, an arm 115 mounted on an upper end of the shaft 114, and a bending pin 116 mounted on a rotational tip of the arm 115. ) And a pair of fixed bending jigs 117 and 118 disposed above the center of rotation of the arm 115 and bent close to the arc portions 117a and 118a of the fixed bending jigs 117 and 118. As the pin 116 is disposed, the reinforcing bars SR (shown by a dashed chain line) supplied to the stopper 120 through the injection holes 119 of the fixed bending jigs 117 and 118 are fixed bending jigs 117 and 118. It is bent in a zigzag form as shown in (a) of Figure 1 by the bending pin 116 rotated around the circular arc (117a, 118a) of the.

In the first bending device 100 configured as described above, when the piston rod 111a is drawn out from the first cylinder 111, the rack gear 112 connected to the piston rod is advanced in the direction of the arrow 161. The pinion gear 113 interlocked with the rack gear 112 rotates counterclockwise, and the shaft 114 coupled with the pinion gear 113 rotates counterclockwise, so that the arm is mounted on the top of the shaft. 115 and the bending pin 116 mounted to the arm are rotated counterclockwise. When the piston rod 111a is drawn into the first cylinder 111, the rack gear 112 connected to the piston rod retreats in the opposite direction to the arrow 161, and the pinion interlocks with the rack gear 112. The gear 113 is rotated clockwise and the shaft 114 is rotated clockwise so that the arm 115 mounted on the top of the shaft and the bending pin 116 mounted on the arm are clockwise. Each turn.

Referring to FIG. 3, the first bending device 100 may further include a guide member mounted on the table 130 such that the fixed bending jigs 117 and 118 are disposed on the perforations 131 of the table 130. The fixed bending jigs 117 and 118 are mounted on the 125, and the first cylinder 111 (see FIG. 2) and the shaft 114 are disposed inside the table 130, and the perforations 131 of the table 130 are disposed. Bending pin 116 is disposed, the reinforcing bar (SR) is supplied to the fixed bending jig 117, 118 through the guide roller 140 and the clamping device 150, and disposed inside the table 130 The stopper 120 is mounted on the table 130 by the third cylinder 121 (see FIG. 2).

The shaft 114 is rotatably supported by bearing means (not shown), and the bearing means is mounted to a frame (not shown) of the table 130.

The bending pin 116 is raised and lowered by an air cylinder (not shown) mounted to the lower surface of the arm 115.

As shown in FIG. 3, the stopper 120 may move along the long hole 132 of the table 130, and may be moved by the distance L1 between the stopper 120 and the fixed bending jig 117 and 118. The width L2 of the primary bent rebar is determined (see FIG. 1).

The clamping device 150 is a device for preventing the reinforcing bars SR supplied to the fixed bending jigs 117 and 118 from moving in the bending process, and the fourth cylinder 152 is mounted on the pedestal 151 in an inverted state. The movable clamp 153 is raised and lowered to the fixed clamp 154 by the fourth cylinder 152.

An operation of the first bending device configured as described above will be described with reference to FIG. 4.

As shown in (a) of FIG. 4, the rebar SR is pushed to the stopper 120 through the fixed bending jig 117 and 118. At this time, the bending pin 116 is located at the right start point S1.

Subsequently, as shown in FIG. 4B, in the process of angular rotation of the bending pin 116 protruding upward from the arm 115 in the counterclockwise direction, the bending pin 116 is a fixed bending jig ( By pressing and bending the rebar SR drawn out to the stopper 120 through the 117 and 118, the rebar SR is bent to correspond to the shape of the arc portion 117a of the right fixed bending jig 117. As a result, as shown in FIG. 1, the first curved portion 11 is formed in the rebar SR.

Then, as shown in FIG. 4C, when the forming of the first curved portion 11 is completed, the bending pin 116 is lowered to the upper surface of the arm 115, and the clock is driven by the arm 115. Direction is rotated to the left start point (X2). Then, the rebar SR is pushed through the fixed bending jigs 117 and 118 until the first curved portion 11 contacts the stopper 120.

Then, as shown in FIG. 4D, the bending pin 116 located at the left starting point X2 protrudes upward from the arm 115, and the bending pin 116 is watched by the arm 115. In the course of angular rotation, the bending pin 116 presses the rebar pulled out through the fixed bending jigs 117 and 118 to the stopper 120 so that the reinforcing bar SR is fixed to the left fixed bending jig 118. Is bent to correspond to the shape of the circular arc portion 118a. As a result, the second curved portion 12 is formed.

Then, when the molding of the second curved portion 12 is completed, the bending pin 116 is lowered to the upper surface of the arm 115, and rotated counterclockwise by the arm 115 to the right starting point (X1) As a result, as shown in FIG. 4A, the binding pin 116 is positioned at the right start point X1, and the bending bending process described above is repeated, thereby forming the primary bending molding of the rebar as shown in FIG. 1. This is done.

Referring to FIG. 5, in the second bending device 200 used in the secondary bending step, a pair of bending rollers 220 and 225 are disposed on the base 210, and one pair of bending rollers 220 and 225 is disposed on the base 210. A plurality of insertion grooves 221 and 226 in which the bent rebars are disposed are formed at regular intervals, and the bending punch 240 that is lifted and lowered to the gap 230 between the bending rollers 220 and 225 includes a movable plate 245. The movable plate 245 is moved up and down along the guide 260 by the cylinder 255 mounted on the upper plate 250, and the reference plate (227) on the pedestal 227 of the bending roller 225. 270 is mounted.

Referring to Figure 6, the second bending device 200 according to the present invention configured as described above, as shown in Figure 6 (a), the operator first bent to the reference plate 270 (SR) Either the first curved portion 11 or the second curved portion 12 is inserted, and the straight portion 13 of the first bent rebar is seated in the insertion grooves 221, 226 of the bending rollers 220, 225. do. By this, the length of the curved portion to be bent is determined.

Thereafter, as illustrated in FIG. 6B, the bending punch 240 descends to press the primary bent rebars seated on the bending rollers 220 and 225, and the curved portion is bent by 90 °.

As a result, as shown in FIG. 1B, the first curved portion 11 and the second curved portion 12 are bent at 90 ° with respect to the straight portion 13.

Referring to FIG. 7, in the third bending device 300 used in the third bending step, a pair of bending rollers 320 and 325 are disposed on the base 310, and two bending rollers 320 and 325 are disposed on the base 310. A plurality of insertion grooves 321 and 326 in which the secondary bent bars are disposed are formed at regular intervals, and the reference plate 345 is mounted on the back plate 341 of the pedestal 340 on which the bending roller 320 is mounted. The support plate 355 is mounted on the back plate 351 of the pedestal 350 on which the bending roller 325 is mounted, and the bending punch 370 that is lifted and lowered by the gap 360 between the bending rollers 320 and 325. Is mounted on the movable plate 375, the movable plate 375 is raised and lowered along the guide 390 by the cylinder 385 mounted on the upper plate 380, and the pushing devices 395 and 396 are bent. The pedestal 350, on which the roller 320 is mounted, and the pedestal 340, on which the bending roller 325 is mounted, are connected to the pedestals 350 and 340 so as to push toward the gap 360.

The operation of the third bending device used in the third bending step configured as described above will be described with reference to FIGS. 8 to 10.

Referring to FIG. 8, the first curved portion 11 and the second curved portion 12 are seated on the reference plate 345 and the support plate 355, and the straight portion 13 is an insertion groove of the bending rollers 320 and 325. Secondary bent bars are disposed to seat at 321 and 326.

Thereafter, as shown in FIG. 9, the bending punch 370 is lowered, and the bending punch 370 bends the center of the straight portion 13.

Thereafter, as shown in FIG. 10, the pushing devices 395 and 396 push the pedestal 350 on which the bending roller 320 is mounted and the pedestal 340 on which the bending roller 325 is mounted toward the gap 360. In the third curved portion 14 formed by the bending rollers 320 and 325, two vertical portions are bent in parallel to form a shear reinforcement as shown in FIG.

Then, when the formation of the shear reinforcement is completed, the pushing device (395, 396) is returned to its original position, the bending punch 370 is raised, the working standby state of Figure 8, so that the work cycle described above can be repeated. do.

11: first curved portion 12: second curved portion
13: straight portion 14: third curved portion

Claims (7)

A first bending step of bending the reinforcing bars in a zigzag form so that the first curved portion 11 and the second curved portion 12 are connected by the straight portions 13 and the plurality of straight portions 13 are arranged in parallel with each other; ,
A second bending step of bending the first and second curved portions 11 and 12 to face each other such that the first curved portion 11 and the second curved portion 12 are refracted perpendicularly to the straight portion 13;
The first curved portion 11 and the second curved portion 12 face in opposite directions to each other, and the third curved portion 14 disposed between the first curved portion 11 and the second curved portion 12 faces upward; Shear reinforcement bending method characterized in that it consists of a third bending step of bending the center of the straight portion (13) connecting the first curved portion (11) and the second curved portion (12).
A device used in a first bending step for bending reinforcing bars in a zigzag form, comprising: a rack gear 112 operated by a first cylinder 111 and a pinion gear 113 interlocked with the rack gear 112; A shaft 114 on which the pinion gear 113 is mounted, an arm 115 mounted on an upper end of the shaft 114, a bending pin 116 mounted on a rotational tip of the arm 115, and It is composed of a pair of fixed bending jig 117, 118 disposed above the rotation center of the arm 115, the bending pin 116 in close proximity to the arc portion (117a, 118a) of the fixed bending jig (117, 118) By this arrangement, the bending pin 116 that rotates around the circular arc portions 117a and 118a of the fixed bending jig 117 and 118 stops 120 through the insertion hole 119 of the fixed bending jig 117 and 118. Shear reinforcement characterized in that the reinforcing bars (SR) supplied to the zigzag form bent around the circular arcs (117a, 118a) of the fixed bending jig (117, 118) Bending device.
The method of claim 2,
The fixed bending jig 117, 118 is mounted on the guide member 125 mounted on the table 130 so that the fixed bending jig 117, 118 is disposed on the perforations 131 of the table 130. The first cylinder 111 and the shaft 114 are disposed in the interior of the 130, the bending pin 116 is disposed in the perforations 131 of the table 130, and the reinforcing bars SR are guide rollers 140. And the stopper 120 are mounted on the table 130 by the third cylinder 121 disposed inside the table 130 and supplied to the fixed bending jig 117 and 118 through the clamping device 150. Shear reinforcement bending device, characterized in that.
The method of claim 3, wherein
The bending pin 116 is a shear reinforcement bending device, characterized in that the lift by the air cylinder mounted on the lower surface of the arm (115).
The method of claim 2,
The stopper 120 may be moved along the long hole 132 of the table 130, and the width L2 of the first bent reinforcement by the distance L1 between the stopper 120 and the fixed bending jig 117 and 118. Shear reinforcement bending device characterized in that is determined.
An apparatus for bending a first curved portion and a second curved portion of a first bent rebar at right angles, wherein a pair of bending rollers 220 and 225 are disposed on the base 210, and a pair of bending rollers 220 and 225 are disposed in the bending rollers 220 and 225. A plurality of insertion grooves 221 and 226 in which the bent rebars are disposed are formed at regular intervals, and the bending punch 240 that is lifted and lowered to the gap 230 between the bending rollers 220 and 225 includes a movable plate 245. The movable plate 245 is moved up and down along the guide 260 by the cylinder 255 mounted on the upper plate 250, and the reference plate (227) on the pedestal 227 of the bending roller 225. Shear reinforcement bending device characterized in that the mounting.
A device for bending the straight portion of the second bent reinforcing bar to the final reinforcement reinforcement, a pair of bending rollers (320, 325) is disposed on the base 310, the second bending to the bending rollers (320, 325) The plurality of insertion grooves 321 and 326 in which the reinforcing bars are disposed are formed at regular intervals, and the reference plate 345 is mounted on the back plate 341 of the pedestal 340 on which the bending roller 320 is mounted. The backing plate 355 is mounted on the back plate 351 of the pedestal 350 on which the roller 325 is mounted, and the bending punch 370 that moves up and down to the gap 360 between the bending rollers 320 and 325 is movable. It is mounted to the plate 375, the movable plate 375 is raised and lowered along the guide 390 by a cylinder 385 mounted on the upper plate 380, the pushing device (395, 396) is a bending roller ( It is characterized in that it is connected to the pedestal (350, 340) to push the pedestal (350) is mounted and the pedestal (340) mounted with the bending roller (325) toward the gap 360 Shear reinforcing bar bending device.

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