JP2019007314A - Reinforcing bar arranging device, reinforcing bar assembly and manufacturing method of pre-assembled reinforcing bar unit - Google Patents

Abstract

To automatically arrange shear reinforcement muscles such as stirrups even for small scale device.SOLUTION: A reinforcing bar arranging device 1 comprises supporting tools 22, 23 for horizontally supporting a rod-shaped setup strip 91, a reinforcing steel hook 20 on which a plurality of shear reinforcing strips 90 arranged in the longitudinal direction of the setup strip 91 are hung at one end side of the setup strip 91 and which supports these shear reinforcing strips 90, a transfer machine 30 for hanging on the setup strip 91 with the shear reinforcement strips 90 arranged in the length direction of the setup strip 91 by sequentially transferring the plurality of shear reinforcing strips 90 toward the other end of the setup strip 91.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforcing bar arranging device, a reinforcing bar assembly, and a method for manufacturing a pre-assembled reinforcing bar unit.

Patent Document 1 discloses an automatic bar arrangement device. Below, the code | symbol used by patent document 1 is described with a parenthesis, and the technique of patent document 1 is demonstrated.
According to the description in Patent Document 1, the automatic bar arrangement device includes a pulling device (50) that conveys the main reinforcement (M) in the length direction and a stirrup arrangement device (30) provided in the conveyance path of the main reinforcement (M). ) And a bundling device (40) provided on the downstream side of the Stirrup bar arrangement device (30). The operation of the automatic bar arrangement device is as follows. The main bar (M) is conveyed by the pulling device (50), and the stirrup (S) is successively arranged in the main bar (M) during the conveyance, and the stirrup (S). And the main muscle (M) are sequentially bound by the binding device (40).

JP-A-4-106270

However, in the technique described in Patent Document 1, a long main reinforcement (M) is transported, and a stirrup (S) is further bound to the main reinforcement (M). .
In addition, since a large number of main bars (M) are conveyed by the drawing device (50), the drawing device (50) requires a large driving force. Therefore, the drawing device (50), and hence the automatic bar arrangement device, becomes large-scale.

  The present invention has been made in view of the above circumstances, and the problem to be solved by the present invention is to enable automatic arrangement of shear reinforcement bars such as stirrup even in a small-scale device. That is.

  The reinforcing bar array device of the present invention for solving the above problems includes a support that horizontally supports a bar-shaped setup bar, a reinforcing bar support that supports a plurality of shear reinforcement bars at one end of the setup bar, and By sequentially transferring the plurality of shear reinforcement bars supported by the reinforcing bar support portion toward the other end of the setup bars, the shear reinforcement bars are arranged at intervals in the length direction of the setup bars. And a transfer machine that hangs on the setup line.

According to the above invention, since the transfer machine transfers the shear reinforcement bar lighter than the main bar, the driving force of the transfer machine may be small. In addition, since the transfer device does not transfer the plurality of shear reinforcement bars together, but sequentially transfers them, the driving force of the transfer device can be small. If it does so, a transfer machine and a rebar arrangement device can be made small.
In addition, a plurality of shear reinforcement bars can be automatically arranged in the length direction of the setup bars by the operation of the transfer machine.

  Preferably, the reinforcing bar arranging device further includes a stopper provided on the reinforcing bar support part so as to protrude from the upper surface of the reinforcing bar support part, and the upper surface of the reinforcing bar support part is inclined downward toward the stopper.

  According to the above configuration, the plurality of shear reinforcing bars hung on the reinforcing bar hooks are brought closer to the stopper with a close interval therebetween. If it does so, the position which a transfer machine receives a shear reinforcement can be set to the stopper vicinity.

Preferably, the method for manufacturing a reinforcing bar assembly is a method in which the plurality of shear reinforcing bars are arranged in the length direction of the setup bars using the reinforcing bar arranging device, and then the shear reinforcing bars are bound to the setup bars. is there.
Preferably, in the manufacturing method of the pre-assembled reinforcing bar unit, a plurality of reinforcing bar assemblies are arranged in series in the length direction of the set-up bars, and a main reinforcing bar is arranged on the shear reinforcing bar of the plurality of reinforcing bar assemblies. The main bar is bound to the shear reinforcement bar of the plurality of reinforcing bar assemblies.

  According to the present invention, the shear reinforcement bars can be automatically arranged even in a small reinforcing bar arrangement device. Therefore, labor saving of the bar arrangement work can be achieved and an artificial error can be suppressed.

FIG. 1 is a perspective view of a reinforcing bar arranging device. FIG. 2 is a perspective view of the reinforcing bar arranging device. FIG. 3 is a control block diagram of the reinforcing bar arranging device. FIG. 4 is a drawing showing pitch data of shear reinforcement included in design data of a reinforced concrete beam or column. FIG. 5 is a drawing for explaining the operation of the reinforcing bar arranging device. FIG. 6 is a drawing for explaining the operation of the reinforcing bar arranging device. FIG. 7 is a drawing for explaining the operation of the reinforcing bar arranging device. FIG. 8 is a drawing for explaining the operation of the reinforcing bar arranging device. FIG. 9 is a view for explaining a state of a plurality of shear reinforcement bars arranged by the reinforcing bar arrangement device. FIG. 10 is a perspective view showing a state in which a prefabricated reinforcing bar unit is manufactured.

  Embodiments of the present invention will be described below with reference to the drawings. However, the scope of the present invention is not limited to the following embodiments and illustrated examples.

1. Configuration of Rebar Arrangement Apparatus FIGS. 1 and 2 are perspective views of a reinforcing bar arrangement apparatus 1. FIG. FIG. 3 is a block diagram showing a control configuration of the reinforcing bar arranging device 1.

  The reinforcing bar arrangement device 1 is attached to a machine frame (base) 10, a pair of reinforcing bar hooks (rebar support parts) 20 attached to the machine frame 10, a transfer machine 30 attached to the machine frame 10, and the reinforcing bar hooks 20. Stopper 21, hook (supporting tool) 22 attached to the reinforcing bar 20, receiving material (supporting tool) 23 attached to the machine frame 10, servo controller 40 for controlling the transfer machine 30, and control data Is output to the servo controller 40. Hereinafter, these will be described in detail.

  As shown in FIGS. 1 and 2, the machine casing 10 is a rectangular parallelepiped frame. That is, a pair of lower short side bars 11, a pair of lower long side bars 12, a pair of upper short side bars 13, a pair of upper long side bars 14, and four columns 15 are assembled in a rectangular parallelepiped shape. Thus, the machine casing 10 is configured. In the following, the direction parallel to the longitudinal members 12 and 14 is referred to as the longitudinal direction or the X direction, and the direction parallel to the transverse members 11 and 13 is referred to as the transverse direction or the Y direction. The direction perpendicular to both of these directions is sometimes referred to as the up-down direction or the Z direction.

  A bar-like support member 16 is parallel to the lower short side cross member 11 and the upper short side cross member 13 between the two support columns 15 raised at one end of the pair of lower long side vertical members 12. It is erected. Between the two supporting columns 15 on the opposite side, a rod-shaped support member 17 is installed so as to be parallel to the lower short side cross member 11 and the upper short side cross member 13.

  Two bar-shaped reinforcing bar hooks 20 parallel to each other are fixed to the support member 16 in a cantilever shape. The reinforcing bar hook 20 extends from the support member 16 toward the support member 17 on the opposite side. The reinforcement hook 20 is inclined downward from the base end toward the tip, and the upper surface of the reinforcement hook 20 is similarly inclined. A stopper 21 is attached to the tip of the reinforcing bar 20. The stopper 21 protrudes from the upper surface of the reinforcing bar 20.

  A U-shaped hook 22 is attached to the lower part of the tip of each reinforcing bar 20. On the other hand, a pair of U-shaped receiving members 23 are attached to the upper surface of the support member 17. Here, the height from the lower short side cross member 11 and the lower long side vertical member 12 to the hook 22 and the height from the lower short side cross member 11 and the lower long side vertical member 12 to the receiving member 23 are: Equal to each other. Further, the distance between the pair of hooks 22 and the distance between the pair of receiving members 23 are equal to each other.

  One end of the set-up bar 91 is hung on the hook 22, the other end of the set-up bar 91 is received by the receiving member 23, and the set-up bar 91 is horizontally extended between the hook 22 and the receiving member 23. The setup bar 91 is a round bar or a deformed round bar.

  The two set-up bars 91 supported by the pair of hooks 22 and the receiving member 23 are parallel to each other and parallel to the long-side vertical members 12 and 14. Further, the height from the lower short side cross member 11 and the lower long side vertical member 12 to one set-up bar 91 and the lower short side cross member 11 and the lower long side vertical member 12 to the other set-up bar 91 Are equal to each other. That is, the plane defined by the two setup bars 91 is horizontal.

  A plurality of rectangular frame-shaped shear reinforcement bars 90 are hung on the reinforcing bar hook 20 in a state where they are arranged in the length direction of the set-up bars 91. Thereby, these shear reinforcement bars 90 are supported by the reinforcing bar 20. Further, since the reinforcing bar hooks 20 are inclined, the shear reinforcing bars 90 are brought close to the front end side of the reinforcing bar hooks 20 with a gap therebetween. Among these shear reinforcement bars 90, the shear reinforcement bar 90 (hereinafter referred to as the leading shear reinforcement bar 90) closest to the tip of the reinforcing bar hook 20 is brought into contact with and stopped by the stopper 21.

A transfer machine 30 is mounted on the machine casing 10. The transfer machine 30 is a biaxial gantry. The transfer machine 30 includes a vertical drive mechanism 31, a vertical drive mechanism 32, an arm 34, and a hook 35, which are configured as follows.
The longitudinal drive mechanism 31 is attached to the upper long side vertical member 14 so as to be parallel to one upper long side vertical member 14. The longitudinal drive mechanism 31 includes a linear guide that is parallel to the upper long side longitudinal member 14, a carriage that is movable along the linear guide and attached to the linear guide, and moves the carriage along the linear guide. A drive unit (for example, a servo motor) to be driven.

  The vertical drive mechanism 32 is connected to the vertical drive mechanism 31 (particularly the carriage of the vertical drive mechanism 31). The vertical drive mechanism 32 includes a linear guide that extends vertically, a carriage 33 that can move along the linear guide, and a drive unit (for example, a servo motor) that moves the carriage along the linear guide.

  An arm 34 is attached to the carriage 33 in parallel with the short-side cross members 11 and 13. The arm 34 extends horizontally from the carriage 33 toward the long longitudinal member 14 on the opposite side. A pair of J-shaped hooks 35 are attached to the arm 34. The hanging hook 35 hangs down from the arm 34, bends toward the reinforcing bar hook 20, and is folded upward.

  The vertical drive mechanism 31 moves the vertical drive mechanism 32, the arm 34, and the hook 35 in the vertical direction (direction parallel to the vertical members 12, 14). The vertical drive mechanism 32 moves the arm 34 and the hook 35 in the vertical direction.

  As shown in FIG. 3, the longitudinal drive mechanism 31 is operated by feedback control of the longitudinal drive mechanism 31 by the servo controller 40, whereby the longitudinal positions of the arm 34 and the hook 35 are controlled. Further, the vertical drive mechanism 32 is operated by feedback control of the vertical drive mechanism 32 by the servo controller 40, whereby the vertical positions of the arm 34 and the hook 35 are controlled.

  In controlling the vertical position of the hook 35, the vertical X-axis is set with the position of the leading shear reinforcement 90 in contact with the stopper 21 shown in FIGS. 1 and 2 as the origin. The servo controller 40 recognizes and calculates the vertical position of the hook 35 as the X coordinate.

  In the vertical control of the hook 35, the vertical Z-axis is set with the position of the tip of the upper surface of the reinforcing bar 20 as the origin. The servo controller 40 recognizes and calculates the vertical position of the hook 35 as the Z coordinate.

  As shown in FIG. 3, a servo controller 40 is connected to a computer 41. The computer 41 calculates the pitch data (P1 to Pn shown in FIG. 4 from the pitch data of the shear reinforcement bars) from the design data (for example, CAD data of the reinforcing bar diagram) of the reinforced concrete beam or column as shown in FIG. ) And an X coordinate data string is calculated from these pitch data. Then, the computer 41 outputs the calculated X coordinate data string to the servo controller 40. Each X coordinate of the data string represents a position where the shear reinforcement bar 90 shown in FIGS. 1 and 2 is arranged. The design data is recorded in a storage medium (for example, a hard disk drive or a nonvolatile semiconductor memory) of the computer 41 or is recorded in a portable storage medium that can be attached to and detached from the computer 41.

2. Operation of Rebar Arrangement Device The operation and usage of the rebar arrangement device 1 will be described. In addition, a method for manufacturing the reinforcing bar assembly and the pre-assembled reinforcing bar unit using the reinforcing bar arranging device 1 will be described.

First, a plurality of shear reinforcement bars 90 are hung on the reinforcing bar hooks 20, and these shear reinforcing bars 90 are arranged along the reinforcing bar hooks 20. Then, the shear reinforcement bars 90 are moved toward the tip of the reinforcing bar 20 by their own weight, and the leading shear reinforcement bars 90 are brought into contact with the stopper 21 and stopped.
Next, the two set-up bars 91 are stretched between the hook 22 and the receiving member 23.

  Next, the computer 41 is operated to cause the computer 41 to read design data. Then, the computer 41 extracts pitch data from the design data, and calculates an X coordinate data string from the pitch data. Thereafter, the computer 41 outputs the calculated X coordinate data string to the servo controller 40. Here, the data string output from the computer 41 to the servo controller 40 is a descending data string that proceeds from the largest X coordinate data (value) to the smallest. Although the data sequence of the X coordinate is in descending order, none of the data has the same value.

  The servo controller 40 controls the vertical direction drive mechanism 31 and the vertical direction drive mechanism 32 as follows each time data in the X coordinate data sequence in descending order is input from the servo computer 41 once. As a result, the hook 35 moves along the route shown in FIGS.

  First, when the servo controller 40 controls the vertical drive mechanism 32, the hook 35 is lowered by the vertical drive mechanism 32 to a position below the position of the front end of the reinforcing bar 20 (Z-axis origin) ( (See arrow a in FIG. 5). Thereafter, the servo controller 40 controls the longitudinal drive mechanism 31 so that the hook 35 approaches the leading shear reinforcement 90 by the longitudinal drive mechanism 31 and the position of the leading shear reinforcement 90 (the origin of the X axis). ) (See arrow b).

  Next, when the servo controller 40 controls the vertical drive mechanism 32, the hook 35 is raised to a position above the upper end of the stopper 21 (see arrow C in FIG. 5). Then, the leading shear reinforcing bar 90 is hooked on the hook 35 and lifted from the reinforcing bar 20 (see FIG. 6).

  Next, the servo controller 40 controls the longitudinal drive mechanism 31 according to the X coordinate data input from the computer 41, so that the hook 35 and the shear reinforcement 90 are moved toward the support member 17 by the longitudinal drive mechanism 31. (See arrow d in FIG. 6). Here, the moving distance of the hook 35 is equal to the X coordinate data input from the computer 41 to the servo controller 40, and the hook 35 is moved to the position represented by the X coordinate data (see FIG. 7). . The subsequent shear reinforcement bars 90 hung on the reinforcing bar hook 20 are moved toward the front end of the reinforcing bar hook 20 by their own weight (see arrow k in FIG. 7).

  Next, when the servo controller 40 controls the vertical drive mechanism 32, the hook 35 is lowered to a position below the setup bar 91 by the vertical drive mechanism 32 (see arrow e in FIG. 7). While the hanging hook 35 is being lowered, the shear reinforcing bar 90 is hooked on the set-up bar 91, so that the hanging hook 35 is separated downward from the shear reinforcing bar 90.

  Next, the servo controller 40 controls the vertical driving mechanism 31 so that the hook 35 is moved toward the support member 17 by the vertical driving mechanism 31 (see arrow f in FIG. 8).

  Next, when the servo controller 40 controls the vertical drive mechanism 32, the hook 35 is raised to a position above the upper end of the shear reinforcing bar 90 hung on the setup bar 91 by the vertical drive mechanism 32. (See arrow g in FIG. 8).

  Next, when the servo controller 40 controls the longitudinal drive mechanism 31, the hanging hook 35 passes over the shear reinforcing bar 90 hung on the setup bar 91 toward the reinforcing bar bar 20 and approaches the tip of the bar bar bar 20. (See arrow h in FIG. 8).

  Thereafter, the servo controller 40 repeats the above control. Since the data sequence of the X coordinate is in descending order, by the repeated control of the servo controller 40, the succeeding shear reinforcement 90 is moved from the rear of the shear reinforcement 90 previously arranged on the setup reinforcement 91 toward the tip of the reinforcing bar hook 20. The stepped bars 91 are sequentially arranged in the length direction. Thereby, the plurality of shear reinforcement bars 90 are arranged at intervals in the length direction of the setup bars 91 (see FIG. 9).

  Thereafter, the plurality of shear reinforcement bars 90 hung on the setup bars 91 are bound to the setup bars 91. Next, another set-up bar 92 (see FIG. 2) is passed inside the shear reinforcement bar 90 so as to be parallel to the set-up bar 91, and the set-up bar 92 is bound to the shear reinforcement bar 90. Next, the setup bar 91 is removed from the hook 22 and the receiving member 23, and an assembly (hereinafter referred to as a reinforcing bar assembly) made up of the shear reinforcement bar 90 and the setup bars 91 and 92 is taken from the inside of the machine frame 10. Take it out.

  Similarly, a plurality of reinforcing bar assemblies are manufactured using the reinforcing bar arranging device 1. It should be noted that a plurality of reinforcing bar assemblies may be manufactured in parallel using a plurality of reinforcing bar arranging devices 1, or a plurality of reinforcing bar assemblies are sequentially manufactured using a single reinforcing bar arranging device 1. May be.

  Subsequently, as shown in FIG. 10, a plurality of reinforcing bar assemblies 95 are arranged in series in the longitudinal direction of the setup bar 91.

Next, the plurality of main bars 96 are passed through the inside of the shear reinforcement bars 90 of these reinforcing bar assemblies 95 (see arrow A in FIG. 10). These main bars 96 are bound to the shear reinforcement bars 90 of the reinforcing bar assembly 95. The reinforcing bars are bound to the main reinforcing bars 96 and the shear reinforcing bars 90 as necessary.
The pre-assembled reinforcing bar unit is thus completed. The pre-assembled reinforcing bar unit is used for a beam or column made of cast-in-place reinforced concrete or precast concrete.

3. Effects According to the above embodiment, the following effects can be obtained.
(1) If the reinforcing bar arranging device 1 is used, a plurality of shear reinforcing bars 90 can be automatically arranged in the length direction of the setup bars 91. Therefore, labor saving of bar arrangement work can be achieved, and an artificial error about the pitch of these shear reinforcement bars 90 can be prevented.

(2) The computer 41 extracts pitch data from the design data, and the computer 41 calculates an X coordinate data string based on the pitch data. Then, the servo controller 40 controls the longitudinal direction driving mechanism 31 according to each data of the X coordinate, and the shear reinforcement bar 90 is arranged at the position represented by each data. Therefore, the pitch of the shear reinforcement bars 90 can be exactly as designed.

(3) The transfer machine 30 transfers a shear reinforcement bar 90 that is lighter than the main bar 96. Further, the transfer machine 30 transfers the shear reinforcement bars 90 one by one. Therefore, the driving force of the transfer machine 30 may be small. Therefore, the vertical direction drive mechanism 31 and the vertical direction drive mechanism 32 of the transfer machine 30 and the servo motors incorporated therein are downsized. Then, the reinforcing bar arranging device 1 can be made small.

(4) The reinforcing bar 20 is inclined and the position of the leading shear reinforcing bar 90 is determined by the stopper 21. Therefore, the position where the shear reinforcement bar 90 is lifted by the hook 35 is fixed. Therefore, a sensor for detecting the position of the leading shear reinforcement 90 is not necessary, and automatic arrangement of the plurality of shear reinforcements 90 can be realized at low cost.

(5) The setup bar 91 supported by the hook 22 and the receiving member 23 is horizontal. Therefore, the shear reinforcement bar 90 hung on the setup bar 91 is not located by gravity.

(6) If this reinforcing bar arrangement device 1 is used, a large pre-assembled reinforcing bar unit can be divided into a plurality of small reinforcing bar assemblies 95 to be manufactured. The small rebar assembly 95 can be easily handled and transported. Further, if the plurality of reinforcing bar assemblies 95 are manufactured in parallel, it is possible to shorten the manufacturing time of a large pre-assembled reinforcing bar unit.

4). Modifications As mentioned above, although the form for implementing this invention was demonstrated, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention. Changes from the above embodiment will be described below. The changes described below may be applied in combination as much as possible.

(1) In the above embodiment, the plurality of shear reinforcing bars 90 hung on the reinforcing bar hook 20 are brought close to the stopper 21 using gravity. On the other hand, a plurality of shear reinforcement bars 90 are biased toward the tip of the reinforcing bar 20 by a biasing device such as a spring, a hydraulic cylinder, an air cylinder, or an air spring, and the leading shear reinforcement bar 90 contacts the stopper 21. It may be stopped by contact. In this case, the reinforcing bar 20 may be inclined as in the above-described embodiment, or may be horizontal.

(2) In the above embodiment, the shear reinforcement bar 90 is a closed type shear reinforcement bar, but may be a U-shaped shear reinforcement bar. In this case, after arranging the plurality of shear reinforcement bars 90 using the above-described reinforcing bar arrangement device 1, the open portion of the shear reinforcement bars 90 is closed by the cap bars.

(3) In the above embodiment, the transfer machine 30 is a biaxial gantry having a vertical drive mechanism 31 and a vertical drive mechanism 32, but the transfer machine 30 is a uniaxial drive having a vertical drive mechanism 31. It may be a gantry. In this case, the arm 34 is attached to the carriage of the vertical drive mechanism 31.

(4) In the above embodiment, the hook 35 as the reinforcing bar holder (end effector) is provided on the arm 34, and the shear reinforcing bar 90 is lifted by the hook 35. A reinforcing bar holder (end effector) other than the hook 35 may be provided on the arm 34, and the shear reinforcing bar 90 may be held by the reinforcing bar holder. Examples of the reinforcing bar holder include an electromagnet, a vacuum suction pad, and a gripper.
When an electric current is applied to the electromagnet, the shear reinforcement bar 90 is magnetically attached to the electromagnet by the magnetic force, whereby the shear reinforcement bar 90 is held by the electromagnet. On the other hand, when the application of current to the electromagnet is released, the shear reinforcing bar 90 is detached from the electromagnet.
When the vacuum suction pad becomes negative pressure, the shear reinforcement bar 90 is adsorbed by the vacuum suction pad by the pressure, and thereby the shear reinforcement bar 90 is held by the vacuum suction pad. On the other hand, when the vacuum suction pad becomes positive pressure, the shear reinforcing bar 90 is detached from the vacuum suction pad.
The gripper has two clampers that come in contact with and away from each other, and the shear reinforcement bars 90 are clamped when these clampers approach each other. When the clampers are separated from each other, the holding of the shear reinforcing bar 90 by the gripper is released.

DESCRIPTION OF SYMBOLS 1 ... Rebar arrangement apparatus 10 ... Machine frame 20 ... Rebar hook (rebar support part)
21 ... Stopper 22 ... Hook (support)
23 ... Receiver (support)
DESCRIPTION OF SYMBOLS 30 ... Transfer machine 90 ... Shear reinforcement 91 ... Set-up reinforcement 95 ... Rebar assembly 96 ... Main reinforcement

Claims (4)

A support that horizontally supports the rod-shaped setup line;
A rebar support part that supports a plurality of shear reinforcement bars at one end of the set-up bars;
A state in which the plurality of shear reinforcement bars supported by the reinforcing bar support portion are sequentially transferred toward the other end of the setup bars, and these shear reinforcement bars are arranged at intervals in the length direction of the setup bars. A rebar arrangement device comprising: a transfer device that is hung on the set-up line. A stopper provided on the reinforcing bar support part so as to protrude from the upper surface of the reinforcing bar support part;
The reinforcing bar arrangement device according to claim 1, wherein an upper surface of the reinforcing bar support portion is inclined downward toward the stopper. A method of manufacturing a reinforcing bar assembly in which the plurality of shear reinforcing bars are arranged in the length direction of the setup bars using the reinforcing bar arranging apparatus according to claim 1 and then the shear reinforcing bars are bound to the setup bars. . A plurality of reinforcing bar assemblies manufactured by the manufacturing method according to claim 3 are arranged in series in a length direction of the set-up bars, and main bars are arranged on the shear reinforcement bars of the plurality of reinforcing bar assemblies. A method for manufacturing a pre-assembled reinforcing bar unit that binds the main reinforcing bars to the shear reinforcing bars of the plurality of reinforcing bar assemblies.

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