Reinforcing bar connector and reinforcing bar assembly

Abstract

To assemble a foldable reinforcing bar assembly while ensuring a stable connection state of reinforcing bars. [Solution] A reinforcing bar assembly 1 includes a plurality of reinforcing bars 2 extending in a first direction and arranged on a plane at intervals in a second direction perpendicular to the first direction, and a plurality of reinforcing bar connecting devices 3 arranged at intervals in the first direction. Each reinforcing bar connecting device 3 includes a support bar 5 having a flat portion 5a and a plurality of connecting mechanisms 6. The support bar 5 is arranged to intersect with the plurality of reinforcing bars 2. A bearing hole 5x is formed in the flat plate portion 5a at a location where the support bar 5 intersects with the reinforcing bar 2. Each connecting mechanism 6 includes a bolt 10 and a connecting nut 40. The bolt 10 includes a holding portion 11 having an arc shape and surrounding a part of the outer periphery of the reinforcing bar 2, and a male threaded portion 12 (rotating shaft portion) extending from one end of the holding portion 10. The male threaded portion 12 is rotatably inserted into the bearing hole 5x of the flat plate portion 5a, and a connecting nut 40 is screwed into the male threaded portion 12 on the back side of the flat plate portion 5a.

Description

[Technical field]

[0001] The present invention relates to a reinforcing bar connection device that foldably connects a plurality of reinforcing bars that are arranged on one plane and extend in one direction, and to a reinforcing bar assembly that is assembled using this reinforcing bar connection device. [Background technology]

[0002] By assembling rebar assemblies used for walls, floors, etc. in a factory and transporting them to the construction site, the number of work processes at the construction site can be reduced; however, the width of the rebar assemblies is limited by the width of the truck bed.

[0003] The reinforcing bar assembly disclosed in Patent Document 1 can be folded to reduce its width, so that even a reinforcing bar assembly wider than the bed of a truck can be folded and transported. Simply put, this reinforcing bar assembly is assembled by binding the intersections of multiple reinforcing bars extending in a first direction and multiple reinforcing bars extending in a second direction perpendicular to the first direction with an elastic binding device. The intersecting reinforcing bars are capable of relative rotation, so that the assembly can be folded. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-231637 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0005] When a flexible fastener is used as in Patent Document 1, the connection of the reinforcing bars becomes unstable. [Means for solving the problem]

[0006] The present invention has been made to solve the above-mentioned problems, and is characterized in that a reinforcing bar connecting device comprises a support bar having a flat plate portion, and connecting mechanisms installed at a plurality of reinforcing bar connection points spaced longitudinally on the flat plate portion of the support bar, wherein bearing holes are formed at each of the reinforcing bar connection points of the flat plate portion, and each connecting mechanism has a rotating shaft portion that passes through the bearing hole and is rotatably supported in the bearing hole, and a rigid holding portion that is provided on the rotating shaft portion and holds the reinforcing bar. According to this configuration, the reinforcing bar is held by the rigid holding part, and the reinforcing bar can be rotated relative to the support bar by rotating the rotating shaft part in the bearing hole of the flat plate part, so that 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 having the retaining portion and a male threaded portion as the rotating shaft portion, and the connecting nut is screwed into the male threaded portion on the back side of the flat portion. According to this configuration, the structure of the connecting mechanism can be simplified.

[0008] Preferably, the retaining portion has a curved or bent shape and faces the flat portion of the support bar to surround and retain a portion of the reinforcing bar, with the male thread portion extending from one end of the retaining portion. With this configuration, the connecting mechanism can easily connect the reinforcing bar to the support bar.

[0009] Preferably, the connecting mechanism further has a slide plate that contacts the flat plate portion and cooperates with the retaining portion to hold the rebar, and the bolt further has an insertion portion extending parallel to the male threaded portion from the other end of the retaining portion, and the male threaded portion of the bolt is inserted into one end of the slide plate and the insertion portion of the bolt is inserted into the other end of the slide plate, thereby causing the slide plate to rotate together with the bolt. With this configuration, because 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 the outer periphery of the reinforcing bar is uneven. Also, because the male thread and the insertion part of the bolt are inserted into the holes at both ends of the slide plate, the tip of the holding part can be prevented from shifting sideways and widening, so the reinforcing bar can be held more securely.

[0010] Preferably, a positioning nut is screwed onto the male threaded 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. In addition, if the male threaded portion tilts within the clearance between the male threaded portion and the bearing hole due to the load received from the rebar, it may interfere with the bearing hole and hinder smooth rotation of the bolt; however, the positioning nut can suppress tilting of the male threaded portion near the retaining portion, thereby ensuring smooth rotation of the bolt.

[0011] Preferably, the retaining portion has an arc shape and fits between the lateral ribs of the reinforcing bar to restrict longitudinal movement of the reinforcing bar. With this configuration, the reinforcing bar can be connected to the support bar while suppressing axial movement of the reinforcing bar.

[0012] Another aspect of the present invention is characterized in that a reinforcing bar assembly comprises a plurality of reinforcing bars extending in a first direction and arranged on a plane at intervals in a second direction perpendicular to the first direction, and reinforcing bar connecting devices arranged at intervals in the first direction, with the support bar of each reinforcing bar connecting device arranged to extend in the second direction. Effect of the Invention

[0013] According to the reinforcing bar connection device of the present invention, it is possible to assemble a reinforcing bar assembly that is foldable and capable of maintaining a stable connection state of the reinforcing bars. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a schematic front view of a rebar assembly according to one embodiment of the present invention. [Diagram 2] FIG. 2A is a schematic front view of a reinforcing bar assembly showing a state in the middle of the folding process, and FIG. 2B is a schematic front view showing a state where the folding process is almost completed. [Diagram 3] FIG. 2 is an enlarged front view showing a main portion of a reinforcing bar connecting device used in a reinforcing bar assembly. [Figure 4] 4 is a side view of the reinforcing bar connecting device as viewed from the direction IV in FIG. 3. [Diagram 5] FIG. 4 is a top view of the reinforcing bar connecting device as viewed from the V direction in FIG. 3. [Figure 6] 1 is a front view showing an enlarged part of a reinforcing bar assembly to explain the function of the reinforcing bar connecting device, (A) shows the reinforcing bar assembly in the normal assembly position, and (B) shows the reinforcing bar assembly in the middle of the folding process. However, in order to simplify the drawing, some components of the reinforcing bar connecting device are omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] <Reinforcing bar assembly> An embodiment of the present invention will be described below with reference to the drawings. As shown in Fig. 1, a 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) extending in a first direction on one plane and arranged at equal intervals in a second direction perpendicular to the first direction, and a plurality of reinforcing bar connecting devices 3 (two in this embodiment) 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 vertical ribs 2a extending continuously in the longitudinal direction, and horizontal ribs 2b arranged at intervals in the longitudinal direction.

[0016] <Reinforcing bar connecting device> Each reinforcing bar connection device 3 includes a steel bar 5 (support bar) with an L-shaped cross-section that extends in the second direction and is arranged so as to intersect with all of the deformed reinforcing bars 2, and a number of connection mechanisms 6 (see Figures 3 to 5) provided at a number of reinforcing bar connection points (intersections with the reinforcing bars 2) in one flat plate portion 5a of the steel bar 5. Bearing holes 5x (see Figs. 4 and 5) are formed at each reinforcing bar connecting point of 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 . Bolt 10 is formed by cutting off one end of a commercially available U-bolt, and has a semicircular arc-shaped retaining portion 11 (retaining means), a male threaded portion 12 (rotating shaft portion) extending from one end of this retaining portion 11, and a short insertion portion 13 extending parallel to the male threaded portion 12 from the other end of the retaining portion 11. The slide plate 20 is made of a long and narrow plate material, and has a hole 20a formed in one end portion. The other end portion of the slide plate 20 is folded back to form a thick portion, and a hole 20b is formed in this thick portion.

[0018] <Reinforcement bar assembly preparation process> A positioning nut 30 is screwed onto the male threaded portion 12 of the bolt 10 up to a predetermined position near the retaining portion 11, and the positioning nut 30 is spot welded to the male threaded portion 12 (the welded portion is indicated by the symbol W in FIG. 4). The same number of bolts 10 with positioning nuts 30 as the number of connection points between the steel section 5 and the reinforcing bar 2 in the reinforcing bar assembly 1 are prepared.

[0019] The steel sections 5 of the two reinforcing bar connecting devices 3 are set parallel to each other on a floor or a table with the flat plate sections 5a facing up and maintained horizontally. The slide plate 20 is placed near the rebar connection point of the horizontal flat plate portion 5a of the steel section 5, and the male thread portion 12 of the bolt 10 with the positioning nut 30 is passed 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 manner, 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 placed at the regular rebar connection point, the holding portion 11 of the bolt 10 is removed from the regular rebar connection point. For example, the holding portion 11 is placed at a position 180° away from the rebar connection point with the bearing hole 5x as the center.

[0020] <Reinforcing bar assembly assembly process> The reinforcing bar 2 is spanned across the two steel beams 5 and placed on the reinforcing bar connection point of the flat plate portion 5a via the slide plate 20. As described above, the holding portion 11 of the bolt 10 is positioned away from the reinforcing bar connection point, so the reinforcing bar 2 can be set on the flat plate portion 5a without any hindrance.

[0021] The connection work at each rebar connection point is described in detail below. The male threaded portion 12 of the bolt 10 is pulled out from the bearing hole 5x of the flat plate portion 5a and the hole 20a at one end of the slide plate 20, rotated 180°, and then the male threaded portion 12 is again inserted through the hole 20a of the slide plate 20 and the bearing hole 5x of the flat plate portion 5a, and the insertion portion 13 is inserted into the hole 20b at the other end of the slide plate 20. At the same time, the holding portion 11 is placed over a part of the outer periphery of the reinforcing bar 2. At this time, the holding portion 11 is inserted between the horizontal ribs 2b of the reinforcing bar 2.

[0022] With the bolt 10 in the reset state described above, the slide plate 20 is clamped between the flat plate portion 5a and the positioning nut 30. The slide plate 20 comes into contact with the reinforcing bar 2 near a position determined by the positioning nut 30 with respect to the holding portion 11. As a result, the reinforcing bar 2 is clamped between the holding portion 11 of the bolt 10 and the slide plate 20. The tip surface of the insertion portion 13 is flush with the surface of the slide plate 20 or is set back from this surface.

[0023] Finally, the connecting nut 40 is screwed onto the male thread portion 12 and advanced to the back surface of the flat plate portion 5a. This makes the connecting mechanism 6 irremovably connected to the flat plate portion 5a, and thus the reinforcing bar 2 is connected to the steel member 5 via the connecting mechanism 6. The slide plate 20 is in a state of almost contacting the flat plate portion 5a. This connecting operation of the reinforcing bars 2 is repeated along the longitudinal direction of the steel section 5 to assemble the reinforcing bar assembly 1.

[0024] During the above connection, the connecting nut 40 is not strongly fastened to the flat plate portion 5a, and a state is maintained in which no strong frictional force acts between the connecting nut 40 and the slide plate 20 and the flat plate portion 5a of the shaped steel 5. Therefore, the bolt 10 can rotate around the bearing hole 5x, and the reinforcing bar 2 held by the holding portion 11 of this bolt 10 can rotate relative to the shaped steel 5. Since the male thread portion 12 and the insertion portion 13 of the bolt 10 are inserted into the holes 20a, 20b at both ends of the slide plate 20, respectively, the slide plate 20 can rotate together with the bolt 10. Note that by using a nut with a lock (commonly known as a U-nut) as the connecting nut 40, the reinforcing bar 2 can be reliably held while maintaining an appropriate clearance.

[0025] <Reinforcing bar assembly folding process> In the reinforcing bar assembly 1 assembled as described above, the reinforcing bars 2 are connected by the connecting mechanism 6 at each reinforcing bar connection point of the steel 5 so as to be capable of relative rotation. Therefore, the reinforcing bar assembly 1 can be folded so as to narrow the gap between the reinforcing bars 2. That is, the reinforcing bar assembly 1 can be changed from the regular rectangular shape shown in FIG. 1 to the shape of a parallelogram in the middle of folding shown in FIG. 2(A), and finally to a flattened parallelogram as shown in FIG. 2(B), thereby reducing its width. Therefore, even if the width of the regular shape is large, it can be transported by truck.

[0026] The reinforcing bar 2 is held by the retaining portion 11 of the bolt 10, which has rigidity, so that the steel member 5 and the reinforcing bar 2 can maintain a stable connection state. As shown in Figures 6(A) and (B), when the reinforcing bar 2 and the steel member 5 rotate relatively during the folding process of the reinforcing bar assembly 1, the retaining portion 11 of the bolt 10 rotates about the male thread portion 12 of the bolt 10 with respect to the steel member 5 while the relative positional relationship with the reinforcing bar 2 hardly changes, so that the steel member 5 and the reinforcing bar 2 can rotate stably relative to each other. The slide plate 20 is interposed between the reinforcing bar 2 and the flat portion 5a of the steel section 5, and when the reinforcing bar 2 and the steel section 5 rotate relative to each other, the slide plate 20 rotates together with the retaining portion 11 of the bolt 10 while being almost in contact with the flat portion 5a. Therefore, even if the surface of the reinforcing bar 2 is uneven, the reinforcing bar 2 can rotate relative to the flat portion 5a smoothly and without hindrance. Since the retaining portion 11 of the bolt 10 fits between the lateral ribs 2b of the reinforcing bar 2, the axial movement of the reinforcing bar 2 can also be suppressed.

[0027] Since the male threaded portion 12 and the insertion portion 13 of the bolt 10 are inserted into holes 20a, 20b at both ends of the slide plate 20, even if a load is applied from the reinforcing bar 2 to the retaining portion 11, the tip of the retaining portion 11 can be prevented from shifting laterally and causing the retaining portion 11 to spread, thereby enabling the reinforcing bar 2 to be held more securely. In addition, even if a load is applied to the retaining portion 11 from the reinforcing bar 2, the positioning nut 30 can suppress inclination of the male thread portion 12 near the retaining portion 11, so that the male thread portion 12 does not interfere with the bearing hole 5x, ensuring smooth rotation of the bolt 10 during the folding process.

[0028] The present invention is not limited to the above embodiment, and various forms can be adopted. For example, the male thread portion 12 of the bolt 10 may be longer than that of the above embodiment. In this case, the male thread portion 12 of the bolt 10 is inserted in advance into the hole 20a of the slide plate 20 and the bearing hole 5x of the flat plate portion 5a of the shaped steel 5, and then the reinforcing bar 2 is set at the reinforcing bar connecting portion of the flat plate portion 5a of the shaped steel 5. Instead of completely pulling out the male thread portion 12 from the bearing hole 5x of the flat plate portion 5a as in the above embodiment, the bolt 10 is rotated with the holding portion 11 moved away from the flat plate portion 5a while still inserted into the bearing hole 5x, and then the holding portion 11 is placed over the reinforcing bar 2. As a result, the workability can be further improved. Furthermore, when using a bolt 10 having a long male thread portion 12, the steel 5 can be set with the flat plate portion 5a tilted rather than horizontal, and with the male thread portion 12 inserted into the bearing hole 5x, the reinforcing bar 2 can be rolled along the inclination of the flat plate portion 5a to engage with the male thread portion 12. This method can further reduce the work of positioning the reinforcing bar 2 on the steel 5.

[0029] Instead of welding the positioning nut 30 to the bolt 10, it may be secured with a metal instant adhesive. Also, the positioning nut 20 may simply be 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 adhesive in addition to screwing. When fixing each member by a fixing means such as welding or adhesive, a rotating shaft portion, a positioning member, and a connecting member that do not have a screw-type structure can also be used.

[0030] The slide plate 20 may be a full-length thick plate instead of a folded thin plate. The bolt 10 may be made by cutting a threaded rod to a predetermined length and then bending it into a J shape, or by threading and bending a round bar member.

[0031] The positioning nut may be omitted. Furthermore, the slide plate may be omitted. In the case where the slide plate is omitted, the bolt insertion portion may be omitted. The support bar may be a steel section having a U-shaped cross section. The holding portion may be in a bent shape having an angle other than the arc shape. The holding portion may be in a ring shape. [Industrial Applicability]

[0032] The present invention is applicable to rebar assemblies used in walls and floors. [Explanation of symbols]

[0033] 1 Reinforcement bar assembly 2. Steel Bars 3 Rebar connection device 5 Type steel (support bar) 5a Flat plate part 5x bearing holes 6 Connection mechanism 10 Volts 11 Holding part 12 Male threaded portion (rotating shaft portion) 13 Insertion section 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 rebar connecting points spaced apart in the longitudinal direction on the flat plate portion of the support bar, A bearing hole is formed at each of the reinforcing bar connection points of the flat plate portion, Each of the connecting mechanisms has a rotating shaft portion that passes through the bearing hole and is rotatably supported in the bearing hole, and a rigid holding portion that is provided on the rotating shaft portion and holds a reinforcing bar, A reinforcing bar connecting device characterized in that the rotating shaft portion rotates in the bearing hole while the holding portion holds the reinforcing bar, thereby enabling relative rotation of the reinforcing bar with respect to the support bar.

2. the connecting mechanism includes a bolt and a connecting nut, the bolt integrally includes the retaining portion and a male thread portion serving 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 threaded portion on the back side of the flat plate portion.

3. The reinforcing bar connecting device according to claim 2, characterized in that the retaining portion has a curved or bent shape, faces the flat portion of the support bar, and holds a portion of the reinforcing bar in a surrounding manner, and the male thread portion extends from one end of the retaining portion.

4. The connecting mechanism further includes a slide plate, the slide plate contacting the flat plate portion and cooperating with the holding portion to hold the reinforcing bar, The bolt further has an insertion portion extending from the other end of the holding portion in parallel with the male thread portion, The reinforcing bar connecting device according to claim 3, characterized in that the male threaded portion of the bolt is inserted into one end of the sliding plate and the insertion portion of the bolt is inserted into the other end of the sliding plate, thereby causing the sliding plate to rotate together with the bolt.

5. The reinforcing bar connecting device according to claim 4, characterized in that a positioning nut is screwed into the male threaded portion between the holding portion and the sliding plate, and this positioning nut determines the position of the sliding plate relative to the holding portion.

6. 4. The reinforcing bar connecting device according to claim 3, wherein the retaining portion is arc-shaped and fits between the lateral ribs of the reinforcing bar to restrict longitudinal movement of the reinforcing bar.

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

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