Steel bar connection device and steel bar assembly body

Abstract

To provide a steel bar assembly body allowed to be foldably assembled while securing a stable bar connection state.SOLUTION: A steel bar assembly body 1 is provided with: a plurality of steel bars 2 extending in a first direction and arranged in a second direction orthogonal to the first direction on the same flat surface with intervals to each other; and a plurality of steel bar connecting devices 3. Each of the bar connecting devices 3 is provided with a support bar 5 having a flat plate part 5a and a plurality of connection mechanisms 6. The support bar 5 is arranged intersectingly to the plurality of steel bars 2. A shaft bearing hole 5x is formed at a position intersecting to the steel bar 2 in the flat plate part 5a. Each of the connecting mechanisms 6 has a bolt 10 and a connection nut 40. The bolt 10 has a holding part 11 covering a part of an outer periphery of the steel bar 2 in a circular arc shape, and a male screw part 12 (a rotational shaft part) extending from one end of the holding part 11. The male screw part 12 is rotatably inserted in the shaft bearing hole 5x in the flat plate part 5a, and the connection nut 40 is screwed on the male part 12 at a rear side of the flat plate part 5a.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a reinforcing bar connecting device that foldably connects a plurality of reinforcing bars arranged on a plane and extending in one direction, and a reinforcing bar assembly assembled using this reinforcing bar connecting device.

Background Art

[0002] By assembling a reinforcing bar assembly used for walls, floors, etc. at a factory and transporting it to a construction site, the working processes at the construction site can be reduced. However, the width of this reinforcing bar assembly is limited by the width of the truck bed.

[0003] The reinforcing bar assembly disclosed in Patent Document 1 can reduce its width by folding, and even a reinforcing bar assembly wider than the truck bed can be folded and transported. Briefly explained, this reinforcing bar assembly is assembled by binding the intersections of a plurality of reinforcing bars extending in a first direction and a plurality of reinforcing bars extending in a second direction orthogonal to the first direction with a stretchable binding tool. Since the relative rotation of the intersecting reinforcing bars is possible, it can be folded.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] When using a stretchable binding tool as in Patent Document 1, the connection of the reinforcing bars is unstable.

Means for Solving the Problems

[0006] The present invention has been made to solve the above-described problems, and in a reinforcing bar connecting device, it includes a support bar having a flat plate portion, and a connecting mechanism installed at a plurality of reinforcing bar connecting locations spaced apart in the longitudinal direction on the flat plate portion of the support bar. Bearing holes are respectively formed at the reinforcing bar connecting locations of the flat plate portion, and each connecting mechanism has a rotating shaft portion that penetrates the bearing hole and is rotatably supported by the bearing hole, and a rigid holding portion provided on the rotating shaft portion for holding a reinforcing bar. According to this configuration, since the reinforcing bar is held by the holding portion having rigidity, and the relative rotation of the reinforcing bar with respect to the support bar is enabled by the rotation of the rotating shaft portion in the bearing hole of the flat plate portion, a foldable reinforcing bar assembly can be assembled. Moreover, the connection state between the support bar and the reinforcing bar can be stably maintained.

[0007] Preferably, the connecting mechanism has a bolt and a connecting nut. The bolt integrally has the holding portion and a male screw portion as the rotating shaft portion, and the connecting nut is screwed onto the male screw portion on the back side of the flat plate portion. According to this configuration, the structure of the connecting mechanism can be simplified.

[0008] Preferably, the holding portion has a curved shape or a bent shape, holds a part of the reinforcing bar so as to surround it facing the flat plate portion of the support bar, and the male screw portion extends from one end of the holding portion. According to this configuration, the work of connecting the reinforcing bar to the support bar by the connecting mechanism can be easily performed.

[0009] Preferably, the connecting mechanism further has a slide plate. The slide plate is in contact with the flat plate portion and cooperates with the holding portion to hold the reinforcing bar. The bolt further has an insertion portion extending in parallel with the male screw portion from the other end of the holding portion. The male screw portion of the bolt is inserted through one end portion of the slide plate, and the insertion portion of the bolt is inserted through the other end portion of the slide plate, whereby the slide plate rotates together with the bolt. According to this configuration, since the slide plate is interposed between the support bar and the reinforcing bar, the reinforcing bar can rotate smoothly relative to the support bar even if there are irregularities on the outer periphery of the reinforcing bar. Further, since the male screw portion and the insertion portion of the bolt are inserted into the holes at both ends of the slide plate, it is possible to prevent the tip of the holding portion from shifting laterally and the holding portion from expanding, and the reinforcing bar can be held more reliably.

[0010] Preferably, a positioning nut is screwed onto the male screw portion between the holding portion and the slide plate, and the position of the slide plate relative to the holding portion is determined by this positioning nut. According to this configuration, the slide plate can be positioned so that the reinforcing bar can be firmly clamped between the holding portion and the slide plate. Also, if the male screw portion tilts within the clearance between the male screw portion and the bearing hole due to the load received from the reinforcing bar, it may interfere with the bearing hole and prevent the smooth rotation of the bolt. However, since the positioning nut can suppress the tilt of the male screw portion in the vicinity of the holding portion, smooth rotation of the bolt can be ensured.

[0011] Preferably, the holding portion has an arc shape and enters between the horizontal ribs of the reinforcing bar to restrict the longitudinal movement of the reinforcing bar. According to this configuration, the reinforcing bar can be connected to the support bar while suppressing the axial movement of the reinforcing bar.

[0012] Another aspect of the present invention is a reinforcing bar assembly including a plurality of reinforcing bars extending in a first direction and arranged on a plane at intervals in a second direction orthogonal to the first direction, and the reinforcing bar connecting device arranged at intervals in the first direction, wherein the support bars of each reinforcing bar connecting device are arranged so as to extend in the second direction.

Advantages of the Invention

[0013] According to the reinforcing bar connecting device of the present invention, a reinforcing bar assembly that can be folded and maintains a stable connection state of the reinforcing bars can be assembled.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0015] <Reinforcing bar assembly> Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the reinforcing bar assembly 1 is used for floors and walls, and includes a plurality of deformed reinforcing bars 2 (hereinafter referred to as reinforcing bars) that extend in a first direction on a plane and are arranged at equal intervals in a second direction orthogonal to the first direction, and a plurality (two in this embodiment) of reinforcing bar connecting devices 3 arranged at intervals in the first direction. In this embodiment, the normal shape of the reinforcing bar assembly 1 is rectangular. As shown in FIG. 4, the reinforcing bar 2 has a longitudinal rib 2a that continuously extends in the longitudinal direction and transverse ribs 2b that are arranged at intervals in the longitudinal direction.

[0016] <Reinforcing bar connecting device> Each reinforcing bar connecting device 3 includes an L-shaped section steel 5 (support bar) arranged to extend in the second direction and intersect all the deformed reinforcing bars 2, and a plurality of connecting mechanisms 6 (see FIGS. 3 to 5) respectively provided at a plurality of reinforcing bar connecting locations (intersection portions with the reinforcing bars 2) on one flat plate portion 5a of the section steel 5. Bearing holes 5x (see FIGS. 4 and 5) are formed at each reinforcing bar connecting location on the flat plate portion 5a.

[0017] Each connecting mechanism 6 includes a J-shaped bolt 10, a slide plate 20, a positioning nut 30, and a connecting nut 40. The bolt 10 is obtained by cutting one end of a commercially available U-bolt, and has a semi-circular arc-shaped holding portion 11 (holding means), a male screw portion 12 (rotating shaft portion) extending from one end of the holding portion 11, and a short insertion portion 13 extending parallel to the male screw portion 12 from the other end of the holding portion 11. The slide plate 20 is made of an elongated plate material, and a hole 20a is formed at one end portion. The other end portion of the slide plate 20 is folded back to be thick, and a hole 20b is formed in this thick portion.

[0018] <Assembly preparation process of the reinforcing bar assembly> The positioning nut 30 is preliminarily screwed onto the male screw portion 12 of the bolt 10 to a predetermined position near the holding portion 11, and the positioning nut 30 is spot-welded to the male screw portion 12 (the welded portion is indicated by reference numeral W in FIG. 4). Prepare as many bolts 10 with the positioning nut 30 as the number of connecting locations between the section steel 5 and the reinforcing bars 2 in the reinforcing bar assembly 1.

[0019] The section steels 5 of the two reinforcing bar connecting devices 3 are set on the floor or the table in parallel with each other in a state where the flat plate portion 5a is facing upward and maintained horizontally. Place the slide plate 20 near the steel bar connection point of the horizontal flat plate portion 5a of the H-shaped steel 5, and pass the male screw portion 12 of the bolt 10 with the positioning nut 30 through the hole 20a at one end of the slide plate 20 and the bearing hole 5x of the flat plate portion 5a. In this way, the slide plate 20 and the bolt 10 with the positioning nut 30 are set on the flat plate portion 5a. However, while the slide plate 20 is arranged at the regular steel bar connection point, the holding portion 11 of the bolt 10 is removed from the regular steel bar connection point. For example, the holding portion 11 is arranged at a position 180° away from the steel bar connection point with the bearing hole 5x as the center.

[0020] <Assembly process of the steel bar assembly> Span the steel bar 2 over two H-shaped steels 5 and place it on the steel bar connection point of the flat plate portion 5a via the slide plate 20. Since the holding portion 11 of the bolt 10 is at a position deviated from the steel bar connection point as described above, the steel bar 2 can be set on the flat plate portion 5a without any hindrance.

[0021] Hereinafter, the connection work at each steel bar connection point will be described in detail. Withdraw the male screw portion 12 of the bolt 10 from the bearing hole 5x of the flat plate portion 5a and the hole 20a at one end of the slide plate 20, turn it 180°, and then insert the male screw portion 12 into the hole 20a of the slide plate 20 and the bearing hole 5x of the flat plate portion 5a again, and insert the insertion portion 13 into the hole 20b at the other end of the slide plate 20. At the same time, cover a part of the outer periphery of the steel bar 2 with the holding portion 11. At this time, let the holding portion 11 enter between the horizontal ribs 2b of the steel bar 2.

[0022] In the re-set state of the bolt 10 described above, the slide plate 20 is clamped between the flat plate portion 5a and the positioning nut 30. The slide plate 20 hits the steel bar 2 near the position determined with respect to the holding portion 11 by the positioning nut 30. As a result, the steel bar 2 is in a state of being clamped between the holding portion 11 of the bolt 10 and the slide plate 20. The front end surface of the insertion portion 13 is flush with or recessed from the surface of the slide plate 20.

[0023] Finally, thread the coupling nut 40 onto the male threaded portion 12 and advance it to the back surface of the flat plate portion 5a. As a result, the coupling mechanism 6 is non-removably coupled to the flat plate portion 5a, and thus the reinforcing bar 2 is coupled to the steel section 5 via the coupling mechanism 6. The slide plate 20 is in a state of being substantially in contact with the flat plate portion 5a. Repeat this connection operation of the reinforcing bar 2 along the longitudinal direction of the steel section 5 to assemble the reinforcing bar assembly 1.

[0024] During the above connection, do not tightly fasten the coupling nut 40 to the flat plate portion 5a, and maintain a state where no strong frictional force acts between the coupling nut 40 and the slide plate 20 and the flat plate portion 5a of the steel section 5. Therefore, the bolt 10 is rotatable about the bearing hole 5x, and the reinforcing bar 2 held by the holding portion 11 of this bolt 10 is relatively rotatable with respect to the steel section 5. Since the male threaded portion 12 and the insertion portion 13 of the bolt 10 are respectively inserted into the holes 20a and 20b at both ends of the slide plate 20, the slide plate 20 can rotate together with the bolt 10. By using a locknut (commonly known as a U-nut) as the coupling nut 40, the reinforcing bar 2 can be securely held while maintaining an appropriate clearance.

[0025] <Folding process of the reinforcing bar assembly> In the reinforcing bar assembly 1 assembled as described above, the reinforcing bar 2 is relatively rotatably coupled by the coupling mechanism 6 at each reinforcing bar connection location of the steel section 5. Therefore, the reinforcing bar assembly 1 can be folded so as to narrow the interval between the reinforcing bars 2. That is, the reinforcing bar assembly 1 can be collapsed from the regular rectangular shape in FIG. 1, through the parallelogram shape during folding in FIG. 2(A), and finally into the collapsed parallelogram as shown in FIG. 2(B), and its width can be reduced. Therefore, even if the width of the regular shape is large, it can be transported by a truck.

[0026] Since the reinforcing bar 2 is held by the holding portion 11 having the rigidity of the bolt 10, the steel section 5 and the reinforcing bar 2 can stably maintain the connected state. As shown in FIGS. 6(A) and 6(B), when the reinforcing bar 2 and the steel section 5 rotate relative to each other in the folding process of the reinforcing bar assembly 1, the holding portion 11 of the bolt 10 hardly changes its relative positional relationship with the reinforcing bar 2 and rotates relative to the steel section 5 around the male screw portion 12 of the bolt 10. Therefore, the steel section 5 and the reinforcing bar 2 can stably rotate relative to each other. The slide plate 20 is interposed between the reinforcing bar 2 and the flat plate portion 5a of the steel section 5. When the reinforcing bar 2 and the steel section 5 rotate relative to each other, the slide plate 20 rotates together with the holding portion 11 of the bolt 10 while being in almost contact with the flat plate portion 5a. Therefore, even if there are irregularities on the surface of the reinforcing bar 2, the reinforcing bar 2 can rotate smoothly relative to the flat plate portion 5a without any trouble. Since the holding portion 11 of the bolt 10 enters between the horizontal ribs 2b of the reinforcing bar 2, the axial movement of the reinforcing bar 2 can also be suppressed.

[0027] Since the male screw portion 12 and the insertion portion 13 of the bolt 10 are inserted into the holes 20a and 20b at both ends of the slide plate 20, even if a load is applied to the holding portion 11 from the reinforcing bar 2, it is possible to prevent the tip of the holding portion 11 from shifting horizontally and the holding portion 11 from expanding, and the reinforcing bar 2 can be held more reliably. Also, even if a load is applied to the holding portion 11 from the reinforcing bar 2, the inclination of the male screw portion 12 near the holding portion 11 can be suppressed by the positioning nut 30. Therefore, the male screw portion 12 does not interfere with the bearing hole 5x, and smooth rotation of the bolt 10 can be ensured in the folding process.

[0028] The present invention is not restricted to the above-described embodiments and can adopt various forms. For example, the male screw portion 12 of the bolt 10 may be made longer than in the above-described embodiment. In this case, with the male screw portion 12 of the bolt 10 inserted in advance through the hole 20a of the slide plate 20 and the bearing hole 5x of the flat plate portion 5a of the section steel 5, after setting the reinforcing bar 2 at the reinforcing bar connection location of the flat plate portion 5a of the section steel 5, the male screw portion 12 is not completely pulled out from the bearing hole 5x of the flat plate portion 5a as in the above-described embodiment, but the bolt 10 is rotated with the holding portion 11 moved away from the flat plate portion 5a while being inserted through the bearing hole 5x, and then the holding portion 11 can be placed over the reinforcing bar 2. As a result, the workability can be further improved. Also, when using a bolt 10 having a long male screw portion 12, the section steel 5 may be set with the flat plate portion 5a inclined instead of horizontal, and with the male screw portion 12 inserted through the bearing hole 5x, the reinforcing bar 2 can be rolled along the inclination of the flat plate portion 5a and locked to the male screw portion 12. According to this method, the positioning work of the reinforcing bar 2 in the section steel 5 can be further reduced.

[0029] Instead of welding the positioning nut 30 to the bolt 10, it may be fixed with a metal instant adhesive. Also, the positioning nut 20 may be simply screwed onto the bolt 10. The bolt 10, the positioning nut 30, and the connecting nut 40 of the connecting mechanism 6 may be fixed to each other by welding or adhesion in addition to screwing. Also, when fixing each member by fixing means such as welding or adhesion, a rotating shaft portion, a positioning member, and a connecting member having no screwing structure can also be used.

[0030] Instead of using a slide plate 20 formed by bending a thin plate, a thick plate over the entire length may be used. As the bolt 10, one obtained by cutting a threaded rod to a predetermined length and then bending it into a J shape may be used, or one obtained by threading and bending a round bar member may be used.

[0031] The positioning nut may be omitted. Further, the slide plate may be omitted. When omitting the slide plate, the insertion portion of the bolt can also be omitted. As the support bar, a section steel having a U-shaped cross section may be used. The holding part may have a bent shape with corners in addition to the arc shape. The holding part may be in a ring shape.

Industrial Applicability

[0032] The present invention can be applied to a reinforcing bar assembly used for walls and floors.

Explanation of Signs

[0033] 1 Reinforcing bar assembly 2 Reinforcing bar 3 Reinforcing bar connecting device 5 Section steel (support bar) 5a Flat plate part 5x Bearing hole 6 Connecting mechanism 10 Bolt 11 Holding part 12 Male screw part (rotating shaft part) 13 Insertion part 20 Slide plate 30 Positioning nut 40 Connecting nut

Claims

1. A support bar having a flat plate portion, and a connecting mechanism installed at a plurality of reinforcing bar connecting locations spaced apart in the longitudinal direction in the flat plate portion of the support bar, bearing holes are respectively formed at the reinforcing bar connecting locations of the flat plate portion, each connecting mechanism has a rotating shaft portion that penetrates the bearing hole and is rotatably supported by the bearing hole, and a rigid holding portion provided on the rotating shaft portion for holding a reinforcing bar, and is characterized in that it is a reinforcing bar connecting device.

2. The connecting mechanism has a bolt and a connecting nut, the bolt integrally has the holding portion and a male screw portion as the rotating shaft portion, The reinforcing bar connecting device according to claim 1, characterized in that the connecting nut is screwed onto the male screw portion on the back side of the flat plate portion.

3. The holding portion has a curved shape or a bent shape, holds a part of the reinforcing bar so as to face the flat plate portion of the support bar and surround it, and is characterized in that the male screw portion extends from one end of the holding portion. The reinforcing bar connecting device according to claim 2.

4. The connecting mechanism further has a slide plate, the slide plate contacts the flat plate portion and cooperates with the holding portion to hold the reinforcing bar, The bolt further has an insertion portion extending parallel to the male screw portion from the other end of the holding portion, The male screw portion of the bolt is inserted through one end portion of the slide plate, and the insertion portion of the bolt is inserted through the other end portion of the slide plate, whereby the slide plate rotates together with the bolt. The reinforcing bar connecting device according to claim 3.

5. A positioning nut is screwed onto the male screw portion between the holding portion and the slide plate, and the position of the slide plate relative to the holding portion is determined by this positioning nut. The reinforcing bar connecting device according to claim 4.

6. The holding portion has an arc shape and enters between the horizontal ribs of the reinforcing bar to restrict the longitudinal movement of the reinforcing bar. The reinforcing bar connecting device according to claim 3.

7. A plurality of reinforcing bars extending in a first direction and arranged on a plane at intervals in a second direction orthogonal to the first direction, and the reinforcing bar connecting device according to any one of claims 1 to 6 arranged at intervals in the first direction, and characterized in that the support bars of each reinforcing bar connecting device are arranged so as to extend in the second direction. A reinforcing bar assembly.

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