JPH07108429B2 - Method of manufacturing multi-directional X-shaped assembled rebar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a multi-directional X-shaped assembly rebar incorporated in an RC column or the like,
In other words, in a plan view, a group of reinforcing bars having a twisted shape in the clockwise direction and a group of reinforcing bars having a twisted shape in the counterclockwise direction are arranged at substantially concentric positions with different diameters. The present invention relates to a method for manufacturing a multi-directional X-shaped assembled rebar in which the above are connected to each other by an annular member.

[Conventional technology]

In a plan view, the reinforcing bar group that has a twisted shape in a clockwise direction and the reinforcing bar group that has a twisted shape in a counterclockwise direction are arranged at positions on substantially concentric circles with different diameters, and these reinforcing bar groups are A multi-directional X-shaped assembled rebar connected to each other by an annular member has already been proposed as Japanese Patent Application No. 62-16367.

[Problems to be Solved by the Invention]

In the multi-directional X-shaped assembled rebar, the rebar group inside the annular member and the rebar group outside the annular member intersect in an X shape in a side view, and the mechanics of the X-shaped bar arrangement method are uniform in any direction. Although it has the advantages of exhibiting the desired characteristics, the rigidity of the assembled rebar is high, and the construction can be performed by the same method as that of the steel frame, there is room for improvement in the following points in manufacturing.

That is, in the above-mentioned multi-directional X-shaped assembled rebar, the connection between the rebars at the upper and lower end portions is as shown in FIGS.
The annular member a having a plate surface perpendicular to the center line of the multi-directional X-shaped rebar and the respective reinforcing bars inserted through the small holes b of the annular member a on both front and back sides of the annular member a. This is done by a plurality of pairs of nuts c ..., C '... that are screwed together. In the drawing, d ... Through holes for parallel reinforcement.

For this reason, in manufacturing the multi-directional X-shaped assembled rebar, as the rebar, those having both ends threaded and threaded bar rebars are required, which not only increases the cost but also increases the cost of forming holes in the annular member a. Drilling and inserting reinforcing bars into small holes b, nuts c ..., c '...
The tightening operation and so on were very troublesome, and the manufacturing efficiency was poor.

In view of the above-mentioned conventional drawbacks, the present invention proposes a manufacturing method capable of manufacturing a multi-directional X-shaped assembled rebar very efficiently and at low cost.

[Means for Solving the Problems]

The technical means taken by the present invention to achieve the above object are as follows. That is, the feature of the manufacturing method of the multi-directional X-shaped assembly rebar according to the present invention is that the rebar is bent such that the upper and lower ends are vertical bars and the middle part is a diagonal bar, and then, at predetermined intervals. , And a pair of drums, which are rotatably and axially movable relative to each other with their centers of rotation on the same axis, are provided with a required number of bent reinforcing bars at both ends at appropriate intervals around the drum. In addition, the attachment positions of both ends of the reinforcing bars to the drums on both sides are held in a state of being displaced by a predetermined angle in one direction around the drums, and annular members are fitted around the outer ends of the reinforcing bars held by the pair of drums. Fitted and fixed, the same number of bent reinforcing bars at both ends at predetermined positions on the outer periphery of the annular member, the mounting positions of both ends of the reinforcing bars to the annular members on both sides are deviated by a predetermined angle in the opposite direction around the drum. Placed in a state After that, the distance between the drums is enlarged and both ends of the multi-directional X-shaped assembled rebar are removed from the drum.

[Action]

According to the above configuration, the required number of rebars whose both ends are bent in advance are provided on the pair of drums at appropriate intervals around the drums, and the mounting positions of the both ends of the rebars on both sides of the drum are set around the drum. When the reinforcing bars are held in a state shifted by a predetermined angle in one direction, the reinforcing bar group has a twisted shape in one direction.

In this state, annular members are fitted over the outer circumferences of both ends of the reinforcing bar group and fixed by means such as welding, adhesion, crimping (mechanical crimping) or the like. As a result, the above group of rebar-shaped reinforcing bars are connected to each other via the annular member.

After that, the same number of reinforcing bars previously bent in the same manner at predetermined positions on the outer periphery of the annular member, the mounting positions of both ends of the reinforcing bars to the annular members on both sides are deviated by a predetermined angle in the opposite direction around the drum. By arranging in such a state, the reinforcing bar group on the outer side of the annular member has a zigzag shape twisted in the other direction. By fixing this loop-shaped rebar group to the annular member by welding, bonding, caulking (mechanical crimping), or the like, the loop-shaped inner rod-shaped group and the outer loop-shaped rod-shaped reinforcing bars are formed into a ring-shaped member. They are connected to form the above-mentioned multidirectional X-shaped assembled reinforcing bar.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of a multi-directional X-shaped assembled rebar manufactured by the method of the present invention. The multi-directional X-shaped assembled rebar has a hooked shape that is twisted clockwise in a plan view. A group of reinforcing bars and a group of reinforcing bars that are twisted in the counterclockwise direction and arranged in a concentric circle with different diameters are arranged, and these groups of reinforcing bars are connected to each other by a pair of upper and lower annular portions B, B. It is a thing.

The specific structure of the multi-directional X-shaped assembled rebar is as follows.

That is, the rebar used to manufacture the multi-directional X-shaped assembled rebar is
As shown in FIG. 3, the upper and lower ends of the vertical streak 1 are
Bending is performed so that the intermediate portions of a and 1a become diagonal stripes 1b. If it is a multi-directional X-shaped assembly rebar built in RC columns,
The interval h between the vertical bars 1a, 1a is set to be substantially equal to the inner height of the upper and lower story beams.

A pair of X-shaped rebars formed by intersecting the above-mentioned two rebars and the diagonal bar 1b in an X-shape, and arranged in point symmetry to form a unidirectional X-shaped rebar A consisting of a set of four rebars. Constitute.

A plurality of sets (three sets in the illustrated embodiment, 12 rebars in total are used) of the one-direction X-shaped bar arrangement A are arranged around the center line, and planes are formed at both upper and lower ends. Oblique muscles 1b that are tilted clockwise in the visual direction ... Vertical muscles 1a at both upper and lower ends of the group, and diagonal muscles 1b that are tilted counterclockwise ...
Vertical strips 1a at both upper and lower ends of the group are arranged with the annular members B and B made of steel plates each having a cylindrical plate surface separated from each other, and welded to both inner and outer side surfaces of the annular members B and B. The multi-directional X-shaped assembly rebar is constructed by fixing them by means such as W.

In FIG. 2, solid line arrows indicate diagonal stripes 1b ... Group tilted clockwise in plan view, and broken line arrows indicate diagonal stripes 1b ... Group tilted counterclockwise in plan view. There is. In other words, the direction of the arrow indicated by the solid line or the broken line indicates that the diagonal line 1b rises from the bottom to the top. In FIG. 2, the → rebar and the → rebar intersect in an X shape to form an X-shaped bar. Also, →
The X-shaped bar is formed by intersecting the X-shaped rebar with the rebar of → and the rebar of →, and a pair of four rebars (→
And →, →, →) constitutes a unidirectional X-shaped bar arrangement A. Similarly, the → rebars and → rebars, → rebars and → rebars each form an X-shaped rebar, and a pair of four rebars (→ and →, → and →) The unidirectional X-shaped bar arrangement A is formed. Furthermore, → rebar and → rebar,
The → rebar and → rebar each form an X-shaped rebar, and a pair of both rebars (→ and →
, → and →) form a unidirectional X-shaped bar arrangement A.

It should be noted that in the drawing, the diagonal stripes 1b inclined in the clockwise direction in a plan view have vertical stripes 1a at the upper and lower ends of the group, and the groups are formed on the outer side surfaces of the annular members B, B and oblique stripes inclined in the counterclockwise direction. Vertical strips 1a at both upper and lower ends of the group are fixed to the inner side surfaces of the annular members B, B by means of welding W or the like, but the relationship between the inside and the outside is reversed, that is, tilted clockwise. Diagonal muscles 1b: Vertical muscles 1a at the upper and lower ends of the group are attached to the inner surface of the annular members B, B. Oblique muscles 1b are inclined in the counterclockwise direction. Vertical muscles 1a are formed at the upper and lower ends of the group. Of course, it may be fixed to the outer side surfaces of the annular members B, B. The rebar may be round steel, deformed bar, threaded bar, or the like, but as shown by phantom lines in FIG. In the case of winding and fixing, it is desirable to use a deformed bar or a threaded bar having unevenness on the surface in order to prevent slippage of the bar C with respect to the bar.

The multi-directional X-shaped assembled rebar shown in FIG. 4 is characterized in that, as the annular members B, B, a rebar having an appropriate thickness is used. In the drawing, one annular member B is formed by using two reinforcing bars as a hoop, but one annular member B is composed of one or three or more reinforcing bars.
May be configured.

The multi-directional X-shaped assembled rebar of FIG. 5 uses 16 rebars pre-bent to the shape shown in FIG. 3, in other words, a unidirectional X consisting of a set of four rebars. This is a multi-direction X-shaped assembled rebar in which four sets of shaped rebars A are used and two rebars intersect in an X-shape in substantially the same vertical plane.

In FIG. 5, 2, 4, 6, 8,
, 10, 12, 12, 14, 16 indicate the inclined lower end side of each diagonal line 1b ...
Reference numerals 2'to 16 'denote the upper end sides of the slanting lines 1b.
→ ', →', → ', →', → ',
→ ', →', → ', →' are rebars having diagonal bars 1b ...
2 ', 4 → 4', 6 → 6 ', 8 → 8', 10 → 10 ', 12 →
Reference numerals 12 ', 14 → 14', 16 → 16 'denote reinforcing bars having diagonal bars 1b ... Inclined counterclockwise in plan view. The → 'reinforcing bar and the 2 → 2'reinforcing bar intersect in an X shape in substantially the same vertical plane. In other words, the X-shaped arrangement intersects so that the X-shaped structure surface becomes vertical. It constitutes the muscle. →
The'reinforcing bar and the 4 → 4 'reinforcing bar also intersect in an X-shape. The pair of X-shaped reinforcing bars are arranged in positions symmetrical with respect to each other, and a set of four reinforcing bars (→ ′ and 2 → 2 ′,
A unidirectional X-shaped bar arrangement A composed of → 'and 4 → 4'). → 'reinforcing bar and 6 → 6'reinforcing bar, →' reinforcing bar and 8 → 8'reinforcing bar are crossed in the same manner as the X shape.
A pair of four X-shaped reinforcements are arranged point-symmetrically with respect to each other, and four pairs of reinforcements (→ ′ and 6 → 6 ″, →
′ And 8 → 8 ′) constitutes a unidirectional X-shaped bar arrangement A. The → 'reinforcing bar and the 10 → 10'reinforcing bar, the →' reinforcing bar and the 12 → 12'reinforcing bar have the same X-shaped bar arrangement, and a pair of the X-shaped bar is arranged in point symmetry. A set of four bars (→ 'and 10 → 10', → 'and 12 → 12')
A unidirectional X-shaped bar arrangement A is formed. → 'reinforcing bar and 14 → 14'reinforcing bar, →' reinforcing bar and 16 → 16'reinforcing bar have the same X-shaped bar arrangement, and a pair of the X-shaped bar is arranged point-symmetrically. A set of four rebars (→ ′
And 14 → 14 ′, → ′ and 16 → 16 ′). Oblique muscles 1b inclined in the clockwise direction in a plan view ... Vertical muscles 1a at both upper and lower ends of the group ... Group are annular members
On the outer surface (or inner surface) of B, B, diagonal stripes 1b inclined in the counterclockwise direction ... Vertical stripes 1a at the upper and lower ends of the group ... Group are formed on the inner surface (or outer surface) of the annular members B, B. The fact that they are fixed by means of welding or the like is the same as the above-mentioned multidirectional X-shaped assembled reinforcing bar.

Next, a method of manufacturing the multi-directional X-shaped assembled rebar will be described.

6 to 11 show a schematic structure of an apparatus used in a method for manufacturing a multi-directional X-shaped assembled rebar. In the figure, 20,20 '
Is a pair of drums that are installed at a predetermined interval and have their centers of rotation located on the same axis. Both drums 20 and 20 'are driven by the output of the electric motor through a speed reducer.
It is possible to rotate synchronously in the same direction. Further, both drums 20 and 20 'are configured to be capable of reciprocating in the axial direction along the guide rails, and the distance between the drums 20 and 20' can be changed. Each drum 20, 20 'has a small diameter part 2
It has 0a and a large diameter portion 20b connected to the outside thereof. First
As shown in FIG. 0, one end of the reinforcing bar located inside the annular member B described above (vertical reinforcing bar portions 1a at both ends of the diagonal reinforcing bar 1b inclined in the counterclockwise direction) is provided on the peripheral surface of the small diameter part 20a. A predetermined number of positioning recesses 21a for fitting are formed at regular intervals, and one end of the reinforcing bar located outside the annular member B (inclined clockwise) is formed on the peripheral surface of the large-diameter portion 20b. The same number of positioning recesses 21b, into which the vertical streak portions 1a) at both ends of the inclined 1b are fitted, are formed at regular intervals.
The recesses 21b of the large diameter portion 20b are provided only in the large diameter portion 20b, but the recesses 21a of the small diameter portion 20a are provided continuously over the large diameter portion 20b. Each of these recesses 21a ...,
In the vicinity of 21b ……, the marks (~,
Numbers such as'to ', other marks, color coding, etc. ) Is written. Recesses 21a of both drums 20, 20 '..., 2
1b ... are provided so as to face each other in the axial direction, but the marks of the recesses 21a ..., 21b ... are shifted in phase by a predetermined angle, and both ends of the reinforcing bar shown in FIG. Drum 2
By fitting in the recesses 21a and 21a and 21b and 21b having the same mark 0, 20 ', the multi-direction X-shape is arranged. For example, as shown in FIGS. 1 and 2, 12 reinforcing bars (6 inside the annular members B, B and 6 outside)
In the case of an apparatus for producing a multi-directional X-shaped assembled rebar using the present book), as shown in FIG. 11, in the left drum 20, the marks ~ are provided in the recesses 21a on the small diameter portion 20a side. Marks ′ to ′ are provided in this order in the clockwise direction in the concave portions 21b ... On the large diameter portion 20b side, and in the right drum 20 ′,
Each of the marks has a phase difference of 120 degrees, and the marks "-" are sequentially added in the counterclockwise direction. Marks for the recesses 21a ... of the small diameter portion 20a of the right drum 20 '
Are 120 degrees out of phase with respect to the marks ~ of the recesses 21a of the small diameter portion 20a of the left drum 20 in the counterclockwise direction, and ,,,, and are opposed to each other in the axial direction. is doing. Also the right drum 20 '
Of the concave portions 21b of the large-diameter portion 20b in FIG.
The phase is 120 degrees out of phase with respect to ~ in the clockwise direction, and'and ',' and ',' and ',' and ',' and ',' and 'oppose each other in the axial direction.

Clamping mechanisms 22 and 22 are provided on the back surface of each of the drums 20 and 20 'for temporarily fixing the ends of the reinforcing bars fitted in the recesses 21a. Each clamp mechanism 22 swings the holding lever 23, which is swingable between a holding state in which the end portion of the reinforcing bar is pressed and fixed to the bottom surface of the recessed portions 21a, 21b, and a holding state, and the holding lever 23 is swingable. Unstable switching spring for biasing (swing fulcrum of clamping lever 23 ... and drum 20, 20 ')
The dead center is the line connecting the spring fixed end to the clamping lever and the dead center is crossed, so that the clamping levers 23 on both sides of the dead center.
(Springs that oscillate in opposite directions) 24
, And a pressing force for swinging all the sandwiching levers 23, which are configured to be reciprocally movable in a state of pressing the end of the sandwiching levers 23, and a state of being separated from the sandwiching levers 23, simultaneously to the sandwiching released state. Ring 25 and the pressure ring
And a fluid pressure cylinder device 26 for reciprocating 25 in the axial direction. 27, 27 is a winding device for winding the annular members B, B, 28 is a stirrup winding device, and is configured to be capable of reciprocating on a rail 29 parallel to the rotation axis of the drum 20, 20 '. Has been done.

The manufacturing method of the multi-directional X-shaped assembled rebar will be described in the order of steps,
It is as follows.

First step: Using a reinforcing bar bending machine (not shown), a desired number of reinforcing bars are bent into the shape shown in FIG.

Second step: As shown by phantom lines in FIG. 10, a predetermined number of bent reinforcing bars at both ends are fitted into the recesses 21a ... Of the small diameter portions 20a, 20a of both drums 20, 20 ', and the clamping mechanism is used. By operating a part of 22 ..., the rebar group is held on both drums 20 and 20 'as shown in FIG. The broken line in Fig. 12 (a) indicates the reinforcing bar. In this state, the reinforcing bar group has a zigzag shape twisted in one direction, as shown in FIG.

Third step In this state, as shown in FIG. 12 (b), a pair of drums
Annular members on the outer periphery of both ends of the reinforcing bar group held at 20, 20 '
Fit B and B and fix them by welding or other means. In fitting the annular members B, B on the end portions of the reinforcing bar group, the following two methods can be adopted. One of them is, as shown in FIG. 14, a method of winding strip steel plates (or reinforcing bars) B ′ ... As another one, as shown in FIG. 15, a pair of annular members B and B are manufactured in advance by a steel strip (or a reinforcing bar), and the annular members B and B are placed between the drums 20 and 20 '. The rebars that have passed through the annular members B, B in the state of being temporarily placed vertically are recessed 21a of the small diameter portions 20a, 20a of the drums 20, 20 'as in the second step.
After that, the annular members B and B are fitted to the drums 20 and 20 '.
It is a method of moving to the side.

Fourth step After that, the same number of reinforcing bars bent into the same shape are
As shown in FIG. 12 (c), the drums 20 and 20 'are fitted into the recesses 21b of the large-diameter portions 20b and 20b, and the remaining portions of the clamp mechanism 22 are manipulated. , 20 '. As a result, the reinforcing bar group on the outside of the annular members B, B has a zigzag shape twisted in the other direction, as shown in FIG. Note that in FIG. 16, the annular members B, B and the looped reinforcing bar group inside thereof are omitted in order to make it easier to understand the twist direction of the outer reinforcing bar group. In this state, the outer reinforcing bar group is fixed to the outer surfaces of the annular members B, B by means such as welding.

Fifth Step After the desired multi-directional X-shaped assembled rebar is manufactured through the steps above, at least one of the drums 20 or 20 'is moved in the axial direction, and as shown in FIG. 20 ′
Increase the distance to drum 2 at both ends of the multi-directional X-shaped assembly rebar
Remove it from 0, 20 '.

If the stirrup C is required, a step of winding the stirrup C by the stirrup winding device 28 can be added between the fourth step and the fifth step. That is, by rotating both drums 20 and 20 'synchronously in the same direction, the multi-directional X-shaped assembly rebar is rotated, and the strip-bar winding device 28 is moved horizontally along the rail 29. The stirrup C is unwound from the device 28, and the stirrup C is spirally wound around the outer periphery of the multi-directional X-shaped assembly rebar. For fixing the spiral strip C to the multi-direction X-shaped assembly rebar, any of welding, bonding, binding, etc. may be adopted. Of course, after removing both ends of the multi-direction X-shaped assembly rebar from the drums 20 and 20 ', it is possible to artificially wind and fix the strip C on the outer periphery of the multi-direction X-shaped assembly rebar.

Further, as the means for fixing the annular members B, B and the inner and outer rebar groups, in addition to welding such as resistance welding, an adhesive may be used,
The following caulking (mechanical crimping) may be adopted. For example, as shown in FIG. 17, the cut-and-raised parts 30 ... Are formed at a predetermined position of the annular member B, and the cut-and-raised parts 30 ...

Although not shown, if it is desired to add parallel reinforcing bars, linear reinforcing bars may be fixed to the outer periphery of the annular members B, B at appropriate intervals in the fourth step.

〔The invention's effect〕

The present invention is configured as described above, and a predetermined number of rebars whose both ends are bent in advance are provided in a pair of drums at appropriate intervals around the drums, and the mounting positions of the both ends of the rebars on the drums on both sides are set. The drum is held in a state of being deviated by a predetermined angle in one direction around the drum, and in this state, annular members are fitted and fixed to the outer circumferences of both ends of the reinforcing bar group. Similarly, by arranging and fixing the same number of bent reinforcing bars in such a manner that the mounting positions of both ends of the reinforcing bars with respect to the annular members on both sides are shifted by a predetermined angle in the opposite direction around the drum, the above-mentioned multiple reinforcing bars are fixed. Direction X
Shaped rebar is manufactured, so round bar that is cheaper than threaded bar and threaded bar and normal deformed bar can be adopted as rebar, and holes for annular members, rebar insertion operations for small holes, and nuts can be used. No tightening operation is required, and multi-directional X-shaped assembled rebar can be manufactured efficiently at low cost.

[Brief description of drawings]

The drawings show embodiments of the invention. FIG. 1 is a perspective view of a multi-directional X-shaped assembly rebar, FIG. 2 is a schematic plan view, and FIG.
It is a side view which shows the reinforcing bar used for a shape assembly reinforcing bar. FIG. 4 is a vertical sectional side view of a main part of a multi-directional X-shaped assembled rebar showing a modified example of an annular member, and FIG. 5 is a partially cutaway schematic plan view of a multi-directional X-shaped assembled rebar using 16 rebars. . Figure 6 shows multidirectional X
FIG. 7 is a plan view, FIG. 8 is a side view of a winding device for an annular member, and FIG. 9 is a side view of a stirrup winding device. FIG. 11 is a schematic perspective view of the drum, and FIG. 11 is an explanatory diagram of marks attached to the left and right drums. 12 (a) to 12 (d) are explanatory views of the manufacturing process, FIG. 13 is a perspective view of the inner reinforcing bar group of the annular member, and FIGS. 14 and 15 are perspective views showing a method of fitting the annular member, respectively. FIG. 16 is a perspective view of an outer reinforcing bar group of an annular member, and FIG. 17 is a perspective view of a main part showing another example of a fixing means for fixing the annular member and the reinforcing bar. 18 and 19 are explanatory views of a conventional example. 1a ... vertical streak, 1b ... diagonal streak, 20,20 '... drum, A
…… One-way X-shaped bar arrangement, B …… annular member.

Claims (1)

[Claims] 1. A planar reinforcing bar group twisted in a clockwise direction in a plan view and a reinforcing bar group twisted in a counterclockwise direction in a staggered shape are arranged at positions on substantially concentric circles having different diameters, A method of manufacturing a multi-directional X-shaped assembled reinforcing bar in which both of these reinforcing bar groups are connected to each other by an annular member, wherein the reinforcing bar is bent so that both upper and lower ends are vertical bars and the middle part is a diagonal bar. Then, a pair of drums, which are rotatably and relatively movable in the axial direction with the rotation center located on the same axis, are arranged at a predetermined interval, and the required number of bent ends are Reinforcing bars that are held by a pair of drums, with the reinforcing bars being held at appropriate intervals around the drum, and with the positions of both ends of the reinforcing bars attached to the drums on both sides being displaced by a predetermined angle in one direction around the drum. Both ends of An annular member is fitted over the outer periphery and fixed, and the same number of bent reinforcing bars at both ends are fixed at predetermined positions on the outer periphery of the annular member. Of the multi-directional X-shaped assembly rebar, characterized in that the two ends of the multi-direction X-shaped assembly rebar are removed from the drum by arranging them at a predetermined angle to each other and fixing them Production method.