JPH0259131A - Manufacturing device for spiral reinforcing bar - Google Patents

Abstract

PURPOSE:To efficiently manufacture a spiral reinforcing bar for prestressing by supporting a reinforcing bar which is fed out by a feeding roller by a fixed position roller, pressing this supported reinforcing bar by a movable roller and forming it in an arc shape. CONSTITUTION:A reinforcing bar which is fed in the axial direction by a feeding roller 13 passes through between front fixed position rollers 15, 16, while holding its linear state. The passing reinforcing bar is pressed by a movable forming roller 17 in front of the fixed position rollers and formed in an arc shape, and becomes circular successively. When this formation is left as prescribed, the reinforcing bar becomes a straight spiral reinforcing bar, and when the movable forming roller is attached to an oscillating arm 22 by a plate cam and the curvature is varied gradually, a spiral reinforcing bar being suitable for a tapered reinforcing bar cage is obtained. In such a way, a spiral reinforcing bar used as a spiral reinforcing bar for the tapered reinforcing bar cage for introducing prestresses can be manufactured efficiently by a simple mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an apparatus for manufacturing spiral reinforcing bars used as spiral reinforcing bars in reinforcing bars such as concrete balls and concrete piles.

<Conventional technology> For example, the strength of general reinforcing bars used in concrete balls is i
As shown in Figure 9, spiral reinforcement B was wound around the outer periphery of reinforcing bars A group arranged in a tapered shape, and each intersection of longitudinal reinforcement A group and spiral reinforcement B was electrically welded [4].

In order to introduce prestress into the concrete ball by making the vertical reinforcement A spiral using reinforcing bars as described above, it is necessary to apply an axial tensile force to the vertical reinforcement A, but the spiral reinforcement B
In a structure in which each intersection with the steel is directly welded, there is a concern that the strength of the welded portion will decrease, and it is considered unsuitable for introducing prestress.

For this reason, as shown in Fig. 10, a reinforcing bar has a structure in which spiral reinforcement B is wound around the outer periphery of vertical reinforcement A group arranged in a tapered shape, and each intersection of longitudinal reinforcement A group and spiral reinforcement B is connected with binding wire C. Noh is considered.

<Problems to be Solved by the Invention> By the way, the strength of the reinforcing bars that connect the intersections of the longitudinal bars A group and the spiral bars B with the binding wire C is that the strength of the longitudinal bars A does not decrease due to welding, so the prestress Although it has the advantage of being suitable for introduction, it is expensive to manufacture because the spiral reinforcement B must be wound around the outer circumference of the vertical reinforcement group A. !
There is a problem in that it requires organization.

In addition, there is a problem in that the reinforcing bars, which are made by binding the intersections of the vertical reinforcement group A and the spiral reinforcement B, have poor production efficiency because there are extremely many binding points.

This invention was made in order to solve the above-mentioned problems, and the purpose is to provide a spiral reinforcing bar manufacturing device that can easily and efficiently produce reinforcing bars suitable for introducing prestressing. shall be.

Means for Solving the Problems> The present invention was made to solve the above-mentioned problems, and includes a system in which the reinforcing bars sent from the feed rolls are placed in front of the feed rolls that feed the reinforcing bars in the axial direction. A plurality of fixed position rolls that are held from both sides and sent forward are arranged, and in front of the front fixed position roll, the reinforcing bars sent out from the fixed position rolls are pressed to shape the reinforcing bars into an arc shape. The movable forming rolls attached are arranged so that they can move toward and away from the reinforcing bars.

In addition, a movable forming roll is attached to an arm that is swung by a plate cam driven by an appropriate drive means to change the curvature of the arcuate shape of the reinforcing bars sent out from the fixed position roll. .

Furthermore, a spiral reinforcing bar support arm that can move toward and away from the fixed-position roll and is rotatable is provided concentrically to the side of the fixed-position roll, and while rotating together with the fixed-position roll, supports the spiral reinforcing bar that is formed in a spiral shape. It was designed to encourage them.

Since the present invention has the above-described configuration, the reinforcing bars sent in the axial direction by the feed rolls pass between the fixed position rolls in the front while being maintained in a straight line, and the reinforcing bars that have passed are By being pressed by a movable forming roll in front of the fixed position roll of the section, it is shaped into an arcuate shape and gradually becomes circular.

If this shape is kept constant, it will become a straight spiral reinforcement, and by attaching a movable forming roll to an arm that is swung by a plate cam, the curvature can be gradually changed to create a spiral reinforcement suitable for tapered reinforcement. Become.

This spiral reinforcing bar is supported by a spiral reinforcing bar support arm that rotates together with the fixed position roll.

<Embodiments> Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 8 of the accompanying drawings.

As shown in FIGS. 1 to 3, on the upper curved surface of the support base 11,
A pair of feed rolls 13.13 for feeding straightened reinforcing bars 12 in the axial direction, and a cutting recess 14 are provided in front of the feed rolls 13.13 in the reinforcing bar moving direction. Also cutting tO1
14, there are a rear fixed position roll 15 and a front fixed position roll 16 that hold the moving reinforcing bar 12 from above and below, and a movable forming roll 17 arranged above the front fixed position roll 16. are set up in sequence.

Guide cylinders 18.19.2 for guiding the reinforcing bars 12 are located at the rear of the winding roll 13 and at the rear and front of the cutting t114.
0 is arranged, and the front fixed position roll 16 is forcibly driven by a motor 16H at a fixed position.

The movable forming roll 17 has an arm 2 attached to a bracket 34 on the support base 11 so as to be able to swing up and down about a shaft 21 at a position close to the front of the fixed position roll 16.
It is rotatably attached to the tip of 2.

This movable forming roll 17 freely rotates and can move toward and away from the reinforcing bar 12 by swinging motion around a shaft 21, and the movable forming roll 17 presses the reinforcing bar 12 in the direction of the fixed position roll 16. This shapes the reinforcing bars 12 into an arc shape.

Therefore, by changing the position of the movable forming roll 17, the curvature of the reinforcing bar 12 changes.

A trochanter 23 is provided on the upper surface of the arm 22 that supports the movable forming roll 17, and a plate cam 23 is provided on the bearing 40 on the support base 11.
The shaft 30 of No. 4 is rotatably attached.

Then, a spring 25 is attached between the arm 22 and the support frame 46 on the support stand 11, and the arm 22 is attached to the trochanter 2.
3 to the plate cam 24.

The lower feed roll 13 and the plate cam 24 are driven by a continuously variable transmission 29 by a cam drive motor 28 fixed on the support base 11.
A synchronous drive is carried out via an appropriate transmission means 27 incorporating a MvJ means 47.

The lower feed roll 13 is driven by the motor 26 in the direction of the arrow in FIG. 2, and the upper feed roll 13 rotates freely.
The plate cam 24 is attached to a bearing 49 pushed downward by a spring 48, and feeds the reinforcing bar 12 sandwiched between the upper and lower feed rolls 13 in the axial direction, and the plate cam 24 rotates to gradually move the movable forming roll 17 downward or upward. This changes the curvature of the arcuate shape of the reinforcing bars 12.

The forming coil diameter of the spiral reinforcing bar to be formed is determined by the cam drive motor 28.
The starting position of the plate cam 24 can be freely selected by manually rotating the plate cam 24 while the plate cam 24 is stopped.

Further, in order to change the ratio of the coil diameters of the spiral reinforcing bars, the rotation ratio between the feed roll 13 and the plate cam 24 may be changed by operating the continuously variable transmission 11i29 incorporated in the middle of the transmission means 27.

To give an example, the general taper of a reinforcing bar cage for concrete balls is 1/75, but by changing the gear ratio of the continuously variable transmission 29 of the embodiment, the taper can be reduced to 1/160. is possible.

Further, a tapered protrusion 44 is provided at the center of the side surface of the front fixed position roll 16, and at a position opposite to this protrusion 44, a pair of horizontal support arms 32 for receiving formed spiral reinforcing bars are provided on both sides. A spiral reinforcing bar support device 45 is provided.

Figure 4 shows details of the spiral reinforcing bar support @45.
Reference numeral 35 denotes a support stand of a spiral reinforcing bar support device 45, and a movable stand 37 is provided thereon to advance and retreat in the direction of the fixed position roll 16 along a guide rail 36, and this stand 27 is driven by a cylinder 39.

A rotary table 33 is rotatably mounted on the movable table 37, and the rotary table 33 is driven by a motor 38 via a transmission means such as a chino.

Further, a pair of bearings 43 is provided on the support plate 51 on the rotary table 33, and the shaft 41 at the rear end of the arm 32 is rotatably and detachably mounted on the bearings 43. 42 is a support plate provided at the rear end of the support arm 32.

Note that the above-mentioned cutting 1114 is activated by a signal from the pulse transmitter 50 on the support base 11. That is, the transmitter 50 is driven by the lower feed roll 13 to emit a pulse signal proportional to the feed length of the reinforcing bar 12, and when the value reaches a set value, the cutting R14 is applied to accurately move the reinforcing bar 12. It is cut to length.

Next, to explain the operation of the above embodiment, first, the support arm 32 is brought close to the fixed position roll 16 by driving the movable table 37 by the cylinder 39, and the opening at the tip thereof is positioned to slightly overlap the protrusion 44. .

Next, the reinforcing bar 12 straightened into a straight line by a straightening roll (not shown) and supplied between the feed rolls 13 passes through a cutting rack 14 by the feed roll 13, and then is placed in a positioning jowl 15, 16. Rebar 12 that came out in front through the gap
is pressed toward the roll 16 by the movable forming roll 17 waiting in front of the frontmost fixed position roll 16, and is shaped into an arc shape.

At this time, if the movable forming roll 17 is at a certain position, the curvature of the reinforcing bar 12 to be formed is constant, so the formed spiral bar will be a straight one with a constant diameter, which is suitable for concrete pipes. .

In addition, the movable forming roll 17 is first placed in the position closest to the fixed position roll 16, and the roll 16 is moved by the rotation of the plate cam 24.
If the spiral reinforcing bars 31 are set so that they gradually separate from each other, the coil of the spiral reinforcing bar 31 to be formed will gradually change from an initial small diameter to a large diameter.

Therefore, when the formed spiral reinforcing bar 31 is stretched, it becomes tapered and becomes suitable for a concrete ball.

As described above, when the reinforcing bar 12 is fed a certain length, the cutting blade 14 works to cut the reinforcing bar 12.

A spiral reinforcing bar 31 formed in a spiral or helical shape is supported by a support arm 32 facing a fixed position roll 61 .

The arm 32 supporting the spiral reinforcing bar 31 is cut l1 as described above.
14 cuts the reinforcing bar 12, the cylinder 39 works to move the movable table 37 backward, and then the motor 38 rotates the rotary table 33 by 180 degrees so that the other support arm 32 faces the fixed position roll 16. , the moving table 37 is in the fixed position roll 1G
Manufacturing of the next spiral reinforcing bar begins under the condition that it moves toward and stops.

Figures 6 and 7 show spiral reinforcing bars 3 manufactured by the above device.
1 is used in a reinforcing bar set. Vertical bars A of a predetermined size are set in a tapered shape, and as shown in Figure 6, this vertical bar A is
Insert the small diameter side of the group into the spiral reinforcing bar 31, and
When the large diameter side of the vertical reinforcement A group is stretched by pulling it toward the large diameter side of the vertical reinforcement group A, the spiral reinforcement is arranged as a spiral reinforcement B around the outer periphery of the vertical reinforcement group A, as shown in FIG.

Therefore, by connecting the intersections of the vertical reinforcements A and the spiral reinforcements B with binding wires, a tapered reinforcing bar set is completed.

Figure 8 shows an example in which the tapered reinforcing bar cage is used as a reinforcement for the ball, and vertical reinforcements A for introducing prestress are attached with binding wires C along the reinforcing bar set. There is.

<Effects of the Invention> The m-wound reinforcing bar manufacturing apparatus of the present invention supports the reinforcing bars sent out by the feed rolls with a plurality of fixed position rolls as described above, and also supports the reinforcing bars supported by the frontmost fixed position roll. Since the reinforcing bars are pressed by movable rolls and shaped into an arc shape to form spiral reinforcing bars or spiral bars, the spiral reinforcing bars used as spiral bars for tapered reinforcing bar cages that introduce prestress can be used with a simple mechanism. It can be manufactured efficiently.

In addition, by appropriately setting the ratio of the moving speed of the movable forming roll in the direction of pressing the reinforcing bars and the reinforcing bar feeding speed of the feed roll, the ratio of the taper of the coil diameter can be freely selected. If the position is fixed, straight spiral muscles can be manufactured easily.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the inventive device, Fig. 2 is a front view of the same, Fig. 3 is a side view of the same, Fig. 4 is a side view of the spiral reinforcing bar support device, and Fig. 5. is a perspective view of spiral reinforcing bars formed by the apparatus of the example, FIG. 6 is a side view of the reinforcing bars before forming, FIG. 7 is a side view of the formed reinforcing bar set, and FIG. Partially cutaway enlarged side view showing the formed state, No. 9
The figure is a side view showing an example of a conventional reinforcing bar set, and FIG. 10 is a partially cutaway enlarged side view showing a state in which vertical bars and spiral bars are connected by the same binding wire. 11...Support stand 12...Reinforcement bar 13
... Feed roll 14 ... Cutting machine 15.
16... Fixed position roll 17... Movable forming roll 31... Spiral reinforcing bar

Claims (3)

[Claims] (1) In front of the feed roll that sends the reinforcing bars in the axial direction, a plurality of fixed position rolls are arranged to hold the reinforcing bars sent from the feed rolls from above and below and send them forward, and in front of the front fixed position rolls. In this method, a movable forming roll that presses the reinforcing bar sent out from the fixed position roll to continuously shape the reinforcing bar into an arc shape into a spiral shape is arranged so as to be able to move toward and away from the reinforcing bar. Spiral reinforcing bar manufacturing equipment. (2) The above-mentioned movable forming roll is attached to an arm that is swung by a plate cam driven by an appropriate driving means, so that the curvature of the arcuate shape of the reinforcing bar sent out from the fixed position roll can be changed. The spiral reinforcing bar manufacturing apparatus according to claim 1. (3) A spiral reinforcing bar support arm that can move toward and away from the fixed position roll and is rotatable is provided concentrically to the side of the fixed position roll, and the spiral reinforcing bar is formed in a spiral shape while rotating together with the fixed position roll. 2. The spiral reinforcing bar manufacturing apparatus according to claim 1, wherein the spiral reinforcing bar manufacturing apparatus is configured to support a spiral reinforcing bar.