JP6955380B2 - Assembly hardware - Google Patents

Description

The present invention provides a configuration that can reasonably offset the force generated by fastening nuts, rather than increasing weight or dimensions, thereby delaying plasticization and with reinforcing bars during construction work. The present invention relates to an assembly hardware capable of guaranteeing a strong assembly state of an assembly member.

Patent Documents 1 and 2 are known as assembling hardware for assembling the reinforcing bar by crossing other members. The "reinforcing bar intersection fastener" of Patent Document 1 can reduce the manufacturing cost, can be easily attached to the reinforcing bar intersection, and can be used as an assembly reinforcing bar ring and in the process of assembling the reinforcing bar cage used for cast-in-place concrete piles. Providing a reinforcing bar intersection fastener capable of firmly fastening the intersection between an assembly strip ring that is welded and fixed along the outer peripheral surface and a plurality of main bars that are assembled and fixed to the outer surface in an intersecting state. As an issue, it is composed of one U-bolt and nut having male threaded portions at both ends and a fastening plate, and the U-bolt is the U-shaped bent portion between both male threaded portions and the U-shaped bent portion. It is bent in a substantially V shape around the arcuate bent portion in a direction intersecting with the bent direction of the above, and the fastening plate is formed with an insertion hole through which both male screw portions of the U bolt can be inserted. The male thread portion has a larger thread than a normal thread and is formed into a round screw, and the pitch is formed longer than the normal pitch.

In Patent Document 1, an arc-shaped notch formed in the side plate portion of the fastening plate having a U-shaped cross section is engaged with the main bar, and by tightening the nut, the fastening plate is bent and deformed around the main bar. When the open end face of the notch comes into contact with the main bar due to bending deformation, the bending of the fastening plate is stopped and the fastening with the nut is completed.

The "reinforcing bar intersection fastening bracket" of Patent Document 2 has a strong force to prevent the other reinforcing bar engaging with the engaging groove of the plate from rotating in the circumferential direction of one reinforcing bar together with both U bolts. As a result, it is an object to provide a reinforcing bar intersection fastening metal fitting that can increase the fastening force of the reinforcing bar intersection, and an engaging groove that abuts and engages with the first reinforcing bar at the intersection of the first reinforcing bar and the second reinforcing bar is provided. It consists of a combination of a plate to be held and two U-bolts and nuts, the plate having two bolt insertion holes at both ends thereof along the engaging grooves, in the U-shaped bends of both U-bolts. At least the part where the second reinforcing bar comes into contact is provided with an uneven portion along the circumferential direction, and two U bolts are inserted into the insertion holes of the plate from the second reinforcing bar side, and the nuts are screwed and fastened. The structure is such that the intersection of both reinforcing bars is firmly fastened and fixed between the two U bolts and the plate.

In Patent Document 2, U bolts that engage the second reinforcing bar are fastened to the plate with nuts on both sides of the engaging groove that engages with the first reinforcing bar. 1 The structure is such that bending deformation around the reinforcing bar occurs.

Japanese Unexamined Patent Publication No. 2013-133595 JP-A-2016-204911

In Patent Document 1, the fastening plate is bent and deformed by the fastening force of the nut to fasten the intersecting members. There was a problem that the fastening plate was easily plasticized at an early stage.

If the fastening plate becomes plastic, bending will proceed at the male threaded part of the U bolt, or if an impact is applied to the main bars, etc. that are fastened in a crossed state with fasteners during construction work, the impact will cause the nut to loosen. Is a concern.

In order to avoid premature plasticization of the fastening plate, it is conceivable to increase the plate thickness or the size of the U-shaped side plate, but if the thickness and dimensions of the fastening plate are increased, the fastening plate will be fastened. When the weight of the tool becomes heavy and it becomes difficult to construct or the size is increased, there is a problem that the amount of concrete used increases in order to secure the concrete cover thickness around the fastener. ..

Patent Document 2 also has a structure in which the plate can be bent and deformed when a nut is fastened to the U bolt. In addition, the plate easily plasticizes early. When the plate is plasticized, it is the same as in Patent Document 1, and when bending progresses at the bolt part of the U bolt or when an impact is applied to the reinforcing bars fastened in a crossed state with the fastening hardware, the nut becomes loose. It ends up.

Further, even in Patent Document 2, if the plate thickness is increased in order to avoid premature plasticization of the plate, there is a problem that the weight of the fastening metal fitting becomes heavy and it becomes difficult to construct the plate.

The present invention has been devised in view of the above-mentioned conventional problems, and has a configuration capable of rationally canceling the force generated by fastening nuts without increasing the weight or size. It is an object of the present invention to provide an assembling hardware capable of delaying plasticization and guaranteeing a strong assembling state of the reinforcing bar and the assembling member during the construction work.

The assembling metal fitting according to the present invention is an assembling metal fitting for assembling the reinforcing bar by crossing the assembling members, and has a U-shaped portion forming a first recess for mounting the reinforcing bar at one end and the other end. In order to mount the assembly member by facing the intermediate portion of the U-shaped member having a pair of bolt portions in the first recess so that the bolt portion intersects the reinforcing bar. A holder having a bent portion forming the second recess and a pair of insertion holes are formed, and these insertion holes are inserted into the pair of bolt portions and installed in the reinforcing bar mounted on the first recess. The fastening piece and the pair of bolts protruding from the insertion holes of the fastening piece are screwed to each other, and the reinforcing bar of the first recess and the assembling member of the second recess are pressed against each other. A pair of nuts for fastening the fastening piece to the reinforcing bar is provided, and the fastening piece is formed with a notch groove for engaging with the reinforcing bar so as to be located between the pair of insertion holes. The notch groove is formed by gradually expanding the groove width from the groove bottom toward the groove opening, and the groove width at the groove opening is set smaller than the outer diameter dimension of the reinforcing bar, and the groove is formed. The depth is set so that a gap is formed between the reinforcing bar engaged with the notch groove and the groove bottom, and the oblique inclination of the notch groove is the first oblique inclination reaching the groove opening. It is composed of a second oblique inclination reaching the groove bottom, and the angle formed by the first oblique inclination and the second oblique inclination is larger than a right angle . Alternatively, the assembling metal fitting according to the present invention is an assembling metal fitting for assembling the reinforcing bar by crossing the assembling member, and has a U-shaped portion forming a first recess for mounting the reinforcing bar at one end, and the like. The assembly member is mounted so that the intermediate portion of the U-shaped member having a pair of bolt portions at the ends is folded back so that the bolt portion intersects the reinforcing bar, and faces the reinforcing bar to be mounted on the first recess. A holder having a bent portion for forming a second recess and a pair of insertion holes are formed, and these insertion holes are inserted into the pair of bolt portions and installed in a reinforcing bar mounted on the first recess. The fastening piece to be fastened and the pair of bolts protruding from the insertion hole of the fastening piece are screwed together to press-contact the reinforcing bar of the first recess and the assembling member of the second recess. The fastening piece is provided with a pair of nuts for fastening the fastening piece to the reinforcing bar, and the fastening piece is formed with a notch groove for engaging with the reinforcing bar by being positioned between the pair of insertion holes. , The notch groove is formed with the same groove width from the groove bottom to the groove opening, the groove width in the groove opening is set smaller than the outer diameter dimension of the reinforcing bar, and the groove depth is the notch. An assembly hardware characterized in that a gap is set between the reinforcing bar engaged with the groove and the bottom of the groove.

The fastening piece has a cross section formed from a substrate portion on which the nut is fixed and a pair of wall plate portions integrally formed on both sides of the substrate portion along the length direction of the reinforcing bar and in which the notch groove is formed. It is characterized in that it is formed in a character shape.

The pair of bolts are characterized in that when the fastening piece is fastened to the reinforcing bar with the nut, the pair of bolts intersects the reinforcing bar at a substantially right angle.

In the assembly hardware according to the present invention, the force generated by fastening the nut can be reasonably offset rather than increasing the weight and dimensions, thereby delaying plasticization and during construction work. It is possible to guarantee a strong assembling state of the reinforcing bar and the assembling member in.

It is a perspective view which shows the use state of one preferable embodiment of the assembly metal fitting which concerns on this invention. It is a parts diagram of the assembly hardware shown in FIG. It is a top view of the main part of the assembly hardware shown in FIG. It is explanatory drawing explaining the engagement mode of the notch groove and the reinforcing bar formed in the fastening piece of the assembly hardware shown in FIG. It is an enlarged view of the notch groove formed in the fastening piece of the assembly hardware shown in FIG. It is explanatory drawing explaining the operation of the assembly hardware shown in FIG. It is explanatory drawing explaining the modification of the assembly metal fitting which concerns on this invention, and its operation. It is a perspective view which shows the other modification of the assembly metal fitting which concerns on this invention.

Hereinafter, preferred embodiments of the assembly hardware according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a usage state of the assembly hardware according to the present embodiment, FIG. 2 is a component diagram of the assembly hardware shown in FIG. 1, and FIG. 3 is a plan view of a main part of the assembly hardware shown in FIG. 4 is an explanatory view for explaining the engagement mode between the notch groove and the reinforcing bar formed in the fastening piece of the assembly hardware shown in FIG. 1, and FIG. 5 is the fastening piece of the assembly hardware shown in FIG. An enlarged view of the notch groove formed in FIG. 6, FIG. 6 is an explanatory view illustrating the operation of the assembly hardware shown in FIG.

As shown in FIG. 1, the assembling hardware 1 according to the present embodiment is used for assembling the reinforcing bar 2 and the assembling member arranged so as to intersect with the reinforcing bar 2 at a position where they intersect. In the illustrated example, the second reinforcing bar 3 is shown as the assembling member. The reinforcing bar 2 and the second reinforcing bar 3 are not limited to a straight shape but may have a curved shape at the intersections of the reinforcing bars 2 and the second reinforcing bar 3.

The assembly hardware 1 is, for example, when a straight reinforcing bar 2 is assembled to a second reinforcing bar 3 in an annular shape at appropriate intervals along the circumferential direction to form a pile reinforcing bar cage, and these reinforcing bars 2 and 3 are attached to each other. Used for assembling at intersections. The material of the assembly member is not limited to metal.

As shown in FIGS. 1 and 2, the assembly hardware 1 includes a holder 4, a fastening piece 5, and a nut 6.

The holder 4 is formed in a form based on the U-shaped member 7. The U-shaped member 7 is formed of a U-shaped portion 8 and a pair of shaft-shaped portions 9 extending substantially parallel to each other from the U-shaped portion 8. A pair of bolt portions 10 are formed at the ends of the shaft-shaped portions 9. As a result, the U-shaped member 7 is configured to include a U-shaped portion 8 at one end and a pair of bolt portions 10 at the other end. The U-shaped member 7 may be replaced with a so-called U-shaped bolt.

The U-shaped member 7 is formed in a form in which a shaft-shaped portion 9 which is an intermediate portion between the U-shaped portion 8 and the pair of bolt portions 10 is folded back, and the bent portion 11 is formed by the folded back portion.

In the holder 4, the U-shaped portion 8 of the U-shaped member 7 forms a first recess 12 for mounting the reinforcing bar 2. The bent portion 11 of the holder portion 4 has the pair of bolt portions 10 on the U-shaped portion 8 side so that the pair of bolt portions 10 sandwich the reinforcing bar 2 of the first recess 12 between them and intersect the reinforcing bar 2. It is formed in a folded form so that it faces. Then, the bent portion 11 forms a second recess 13 for mounting the second reinforcing bar 3 in the holder 4.

In the present embodiment, the bent portion 11 is bent and formed in a dogleg shape with a bending dimension that allows the second reinforcing bar 3 to be attached to the second recess 13.

The second reinforcing bar 3 mounted on the second recess 13 by the bent portion 11 formed by the folded form of the intermediate portion of the U-shaped member 7 has a bolt portion 10 or a U-shaped portion 8 at one end side 3a in the radial direction thereof. In addition, the reinforcing bar 2 mounted on the first recess 12 is positioned so that the one end side 2a in the radial direction is directed toward the bent portion 11, and as a result, the holder 4 is positioned. Is arranged so as to face the radial end side 2a of the reinforcing bar 2 of the first recess 12 and to be adjacent to the reinforcing bar 2, and the second reinforcing bar 3 of the second recess 13 is assembled.

Further, by forming the pair of bolt portions 10 folded back toward the U-shaped portion 8, the bent portion 11 is formed in a direction intersecting the direction of the U-shaped portion 8 of the U-shaped member 7. As a result, the first recess 12 formed by the U-shaped portion 8 and the second recess 13 formed by the bent portion 11 are formed so as to intersect each other, and the holder 4 is mounted on the first recess 12. The reinforcing bar 2 and the second reinforcing bar 3 attached to the second recess 13 are crossed and assembled.

The holder 4 may be manufactured by any method other than bending and molding the bent portion 11 using a U-shaped bolt.

In the present embodiment, the fastening piece 5 has a U-shaped cross section from a flat substrate portion 5a and a pair of wall plate portions 5b integrally formed on both sides of the substrate portion 5a along the length direction of the reinforcing bar 2. It is formed in a shape. A pair of insertion holes 14 through which the pair of bolt portions 10 of the holder 4 are inserted are formed through the substrate portion 5a. The fastening piece 5 is not limited to a member having a U-shaped cross section made of a plate-shaped material, and may have a block shape such as a rectangular parallelepiped shape having a notch groove described later.

The fastening piece 5 is inserted into the bolt portion 10 through the insertion hole 14 so that the reinforcing bar 2 mounted on the first recess 12 has a diameter of 2b on the other end side in the radial direction (diameter facing the second reinforcing bar 3). It is installed facing the one end side 2a in the direction (opposite side).

There are a pair of nuts 6, and each nut 6 is screwed into each of the pair of bolt portions 10 protruding from the insertion holes 14 of the fastening piece 5. Then, the nut 6 is fixed to the substrate portion 5a to fasten the fastening piece 5 to the reinforcing bar 2, whereby the fastening piece 5 is supported by the reinforcing bar 2 and a pair of nuts protruding from the insertion hole 14. The bolt portion 10 is pulled, and by this pulling action, the second reinforcing bar 3 of the second recess 13 is pressed against the reinforcing bar 2 of the first recess 12 via the bent portion 11.

Each of the pair of wall plate portions 5b of the fastening piece 5 is positioned between the pair of insertion holes 14, that is, between the pair of bolt portions 10, and faces the reinforcing bar 2 to engage with the reinforcing bar 2. A notch groove 15 for making the groove 15 is formed.

As shown in FIGS. 1 to 5, the notch groove 15 is formed by sequentially expanding the groove width W from the groove bottom 15b toward the groove opening 15a facing the reinforcing bar 2 at an oblique inclination 17. The oblique inclination 17 is formed in pairs from the groove bottom 15b on both sides toward the groove opening 15a, and defines the form of the notched groove 15.

The groove width W of the notch groove 15 is formed to be the largest at the groove opening 15a (see FIGS. 3 and 5). The dimension of the groove width W of the groove opening 15a is set to be smaller than the outer diameter dimension (diameter) of the reinforcing bar 2. As a result, at the stage where the fastening piece 5 is only brought into contact with the reinforcing bar 2 before the nut 6 is fastened to the bolt portion 10, the reinforcing bar 2 has an arcuate portion narrower than the circumferential half circumference around the outer peripheral surface thereof. , (1) Point contact with a pair of corners 16 on both sides of the groove opening 15a (see FIG. 5 and the like), and (2) Point contact with a pair of diagonally inclined portions 17 of the notch groove 15. Be done.

Further, the groove depth D reaching from the groove opening 15a to the groove bottom 15b is formed on the outer peripheral surface of the reinforcing bar 2 and the groove bottom when the reinforcing bar 2 is engaged with the notch groove 15 such as when the reinforcing bar 2 is in point contact with the groove opening 15a. It is set so that a gap S is formed between the 15b and the 15b (see FIG. 5 and the like). As a result, when the reinforcing bar 2 and the fastening piece 5 are fastened with the nut 6, the nut 6 is formed only between the pair of corners 16 of the groove openings 15a and the pair of diagonally inclined 17s and the reinforcing bar 2 which are in point contact with each other. The fastening force of is acting.

More generally, the notch groove 15 has a groove width W narrower than the outer diameter of the reinforcing bar 2 at any position in the groove depth D direction, and the groove depth D is also a reinforcing bar. It is formed with a size defined deeper than the radius of 2.

Then, in FIG. 4, there are a case where the reinforcing bars 2 are point-contacted at a pair of corners 16 (shown in FIG. 4A) and a pair of diagonal inclinations 17 with respect to the notch groove 15 defined as described above. The difference in the engagement state between the case of point contact (shown in FIG. 4B) and the case of point contact is shown.

“The reinforcing bar 2 engages with the notch grooves 15 and 15x” specifically means that the reinforcing bar 2 comes into contact with any position of the oblique inclination 17 from the groove opening 15a toward the groove bottom 15b.

Assuming that the gap S is set between the groove bottom 15b of the notch groove 15 and the reinforcing bar 2, the reinforcing bar 2 is a pair of corners 16 of the groove opening 15a (the end of the groove opening side of the oblique inclination 17). A case where the reinforcing bar 2 makes a point contact with the portion) and a case where the reinforcing bar 2 makes a point contact with any of the diagonally inclined portions 17 between the pair of corner portions 16 will be examined.

When the fastening piece 5 is pressed in the direction in which the reinforcing bar 2 enters toward the groove bottom 15b, a bearing point by the reinforcing bar 2 is generated in the groove bottom 15b and its vicinity (in the figure, the bearing point is on the line indicated by the alternate long and short dash line X). Occurs). The horizontal distance along the groove opening 15a from this bearing point to the position where the reinforcing bar 2 makes point contact with the oblique inclination 17 is the moment (anti-moment) generated by the reaction force R that resists the pressing of the fastening piece 5. ) Lever lengths L and Lx.

If the levers L and Lx are long, the anti-moment is large, and if the levers L and Lx are short, the anti-moment is small. As shown in FIG. 4A, the maximum lever L is obtained when the reinforcing bars 2 make point contact with the pair of corners 16 having the maximum groove width W. On the other hand, as shown in FIG. 4B, when the reinforcing bar 2 makes point contact with the oblique inclination 17 between the pair of corners 16, the lever Lx becomes short.

Further, in the present embodiment, as shown in FIG. 5, the notch grooves 15 are paired from the groove bottom 15b to both sides, and each of the oblique inclinations 17 for expanding the groove width W is two oblique inclinations, that is, A first oblique inclination 17a reaching the groove opening 15a and a second oblique inclination 17b reaching the groove bottom 15b are configured so as to be continuous. The angle θ formed by the first oblique inclination 17a and the second oblique inclination 17b is set to be larger than the right angle.

As described above, the reinforcing bar 2 is point-contacted at least at two points of the pair of corners 16 of the groove opening 15a. Further, the diagonal inclination 17 is set to two stages of the first oblique inclination 17a and the second oblique inclination 17b, and the angle θ formed by these is set to be larger than the right angle. , The pair of second diagonally inclined 17b is also point-contacted at two points, and the notch groove 15 is point-contacted at four points.

As the number of points of point contact increases, the number of points where a reaction force R that resists the pressing of the fastening piece 5 described above is generated increases, and the stress generated in the wall plate portion 5b can be dispersed.

Next, the operation of the assembled hardware 1 according to the present embodiment will be described. As shown in FIGS. 1 and 6, when assembling the reinforcing bar 2 and the second reinforcing bar 3 in the crossed state with the assembly hardware 1, the second reinforcing bar 3 is attached to the second recess 13 of the holder 4, and then. The reinforcing bar 2 is attached to the first recess 12 of the holder 4. As a result, the reinforcing bars 2 and the second reinforcing bars 3 are arranged in an intersecting state via the holder 4.

Next, each of the pair of bolt portions 10 of the holder 4 is inserted into each insertion hole 14, and the fastening piece 5 is attached toward the reinforcing bar 2 from the side opposite to the bending portion 11 side and supported by the reinforcing bar 2. At this time, the reinforcing bar 2 is engaged with the notch groove 15 of the wall plate portion 5b of the fastening piece 5, and the reinforcing bar 2 can make point contact with the pair of corner portions 16 of the groove opening 15a.

After that, a pair of nuts 6 are screwed to each bolt portion 10. When the nut 6 is fixed to the substrate portion 5a of the fastening piece 5, the fastening piece 5 is fastened to the reinforcing bar 2. When the fastening piece 5 and the reinforcing bar 2 are fastened, the holder 4 presses the second reinforcing bar 3 arranged in the intersecting state with the reinforcing bar 2, thereby completing the assembling by the assembling hardware 1. The pair of bolt portions 10 intersect with the reinforcing bar 2 at a substantially right angle when the assembling in which the fastening piece 5 is fastened to the reinforcing bar 4 with the nut 6 is completed.

When fastening the fastening piece 5 to the reinforcing bar 2 with the nut 6, as shown in FIG. 6A, when the pair of nuts 6 are screwed to the bolt portions 10, the fastening piece 5 becomes each bolt. It is pressed toward the reinforcing bar 2 at the position of the portion 10. Since the bolt portion 10 and the reinforcing bar 2 intersect at a substantially right angle to complete the assembly, the fastening piece 5 is pressed against the reinforcing bar 2 without any deformation such as twisting.

This pressing force F acts on the fastening piece 5 on both sides of the reinforcing bar 2 engaged with the notch groove 15 located between the pair of insertion holes 14, and supports the reinforcing bar 2 that supports the fastening piece 5. Moments M that cause bending deformation of the fastening piece 5 are generated on both sides of the point (see the alternate long and short dash line X in FIG. 4A).

When the pressing force F in which the moment M is generated acts on the fastening piece 5, as shown in FIG. 6B, the pressing force F is formed at the pair of corners 16 of the groove opening 15a where the reinforcing bars 2 are in point contact. A reaction force R with respect to the force R is generated, and the reaction force R can generate a reaction force Mx in a direction that cancels the moment M. After that, when the reinforcing bar 2 comes into point contact with the second oblique inclination 17b, the reaction force R with respect to the pressing force F is dispersed in the pair of corners 16 of the groove opening 15a and the second oblique inclination 17b.

At this time, a gap S is set between the reinforcing bar 2 and the groove bottom 15b of the notch groove 15, and an appropriately and sufficiently large anti-moment Mx is generated as compared with the case where there is no gap S. Can be done. Then, by generating this anti-moment Mx, it is possible to prevent the fastening piece 5 from being plasticized at an early stage.

As described above, in the assembly hardware 1 according to the present embodiment, the notch groove 15 formed in the fastening piece 5 is obliquely inclined 17 from the groove bottom 15b toward the groove opening 15a, and the groove width W. The groove width W at the groove opening 15a is set smaller than the outer diameter dimension of the reinforcing bar 2, and the groove depth D is set to the reinforcing bar engaged with the notch groove 15. Since the gap S is set to be generated between 2 and the groove bottom 15b, the anti-moment that cancels the moment M that causes bending deformation of the fastening piece 5 depending on the form of the notch groove 15 that engages the reinforcing bar 2. Mx can be appropriately generated, the plasticization of the fastening piece 5 can be delayed, and a strong assembling state of the reinforcing bar 2 and the second reinforcing bar 3 during the construction work can be guaranteed.

Further, by setting the shape of the notch groove 15 without increasing the weight and dimensions of the fastening piece 5, the plasticization of the fastening piece 5 can be delayed in a compact configuration, and sufficient assembling strength is ensured. At the same time, it can be constructed without increasing the amount of concrete used and with good workability.

Since the fastening piece 5 is formed in a U-shaped cross section from the substrate portion 5a and the pair of wall plate portions 5b in which the notch grooves 15 are formed, the construction can be carried out comparable to the conventional one.

The oblique inclination 17 of the notch groove 5 is composed of a first oblique inclination 17a reaching the groove opening 15a and a second oblique inclination 17b reaching the groove bottom 15b, and the first oblique inclination 17a and the second oblique inclination 17b form a structure. Since the angle θ is set larger than the right angle, the reinforcing bars 2 can be appropriately point-contacted at the position of the second diagonal inclination 17b, the stress dispersion in the fastening piece 5 is ensured, and the assembled state is stronger. Can be guaranteed.

When the fastening piece 5 is fastened to the reinforcing bar 2 with the nut 6, the pair of bolt portions 10 intersect with the reinforcing bar 2 at a substantially right angle. It can be accurately engaged, the anti-moment Mx can be efficiently generated in both the wall plate portions 5b, and the fastening piece 5 can be prevented from being deformed such as twisting.

7A and 7B are explanatory views illustrating a modified example of the assembled hardware 1 and its operation according to the present embodiment, FIG. 7A is a plan view of a main part of the assembled hardware 1, and FIG. 7B is a plan view of the main part. It is a figure explaining the state of the reaction force generated.

In this modification, the notch groove 15 is formed with an oblique inclination 17 from the groove bottom 15b toward the groove opening 15a, and the groove width W is sequentially expanded, but instead extends from the groove bottom 15b to the groove opening 15a. The groove widths W are formed equally. That is, the notch groove 15 is formed in a concave shape.

In the notch groove 15, the groove width W at the groove opening 15a is set to be smaller than the outer diameter dimension of the reinforcing bar 2, and the groove depth D engages with the notch groove 15, as in the above embodiment. A gap S is set between the reinforcing bar 2 to be formed and the groove bottom 15b. Therefore, the reinforcing bar 2 is always in point contact with the pair of corners 16 of the groove opening 15a, and a counter-moment Mx with respect to the moment M generated by fastening the nut 6 can be generated.

When the gap S disappears, the stress generated in the fastening piece 5 can be dispersed by resisting the pressing force F by the nut 6 at three locations including the groove bottom 15b. Further, the notch groove 15 of this modified example can be produced extremely easily. Of course, even in such a modified example, the same action and effect as those of the above-described embodiment can be obtained.

FIG. 8 is a perspective view showing another modified example of the assembled hardware 1 according to the present embodiment. In the above embodiment, the second reinforcing bar 3 is illustrated as the assembling member, but the assembling member is not limited to the reinforcing bar, and may be a straight or curved strip-shaped plate member 18.

In this case, the bent portion 11 is bent and formed according to the form of the assembling member mounted on the second recess 13. That is, in the illustrated example in the case of the strip-shaped plate member 18, the bent portion 11 is formed in a "U" shape instead of a dogleg shape. In this way, even in the case of the strip-shaped plate member 18, it is possible to form the holder 4 in which the bolt portion 10 intersects the reinforcing bar 2 at a substantially right angle. Of course, even in such a modified example, the same action and effect as those of the above-described embodiment can be obtained.

1 Assembly hardware 2 Reinforcing bar 3 Second reinforcing bar 4 Holder 5 Fastening piece 5a Board part 5b Wall plate part 6 Nut 7 U-shaped member 8 U-shaped part 10 Bolt part 11 Bending part 12 1st recess 13 2nd recess 14 Insertion Hole 15 Notch groove 15a Groove opening 15b Groove bottom 17 Diagonal slope 17a 1st diagonal slope 17b 2nd diagonal slope 18 Band-shaped plate material D Groove depth S Gap W Groove width θ The angle between the 1st diagonal slope and the 2nd diagonal slope

Claims (4)

It is an assembly hardware for assembling the reinforcing bars by crossing the assembly members.
An intermediate portion of a U-shaped member having a U-shaped portion forming a first recess for mounting a reinforcing bar at one end and a pair of bolt portions at the other end so that the bolt portion intersects the reinforcing bar. A holder provided with a bent portion that forms a second recess for mounting the assembling member facing the reinforcing bar mounted on the first recess in a folded form.
A pair of insertion holes are formed, and these insertion holes are inserted into the pair of bolts, and a fastening piece installed on a reinforcing bar mounted on the first recess is used.
Each of the pair of bolts protruding from the insertion hole of the fastening piece is screwed into the reinforcing bar of the first recess and the assembling member of the second recess is pressed against the reinforcing bar of the fastening piece. Equipped with a pair of nuts for fastening to
The fastening piece is formed with a notch groove for engaging with the reinforcing bar so as to be located between the pair of insertion holes.
The notch groove is formed by gradually expanding the groove width from the groove bottom toward the groove opening, and the groove width at the groove opening is set smaller than the outer diameter dimension of the reinforcing bar, and the groove width is set to be smaller than the outer diameter dimension of the reinforcing bar. The groove depth is set so that a gap is formed between the reinforcing bar engaged with the notch groove and the groove bottom.
The oblique inclination of the notch groove is composed of a first oblique inclination reaching the groove opening and a second oblique inclination reaching the groove bottom, and the angle formed by the first oblique inclination and the second oblique inclination is Assembled hardware characterized by being larger than a right angle. It is an assembly hardware for assembling the reinforcing bars by crossing the assembly members.
An intermediate portion of a U-shaped member having a U-shaped portion forming a first recess for mounting a reinforcing bar at one end and a pair of bolt portions at the other end so that the bolt portion intersects the reinforcing bar. A holder provided with a bent portion that forms a second recess for mounting the assembling member facing the reinforcing bar mounted on the first recess in a folded form.
A pair of insertion holes are formed, and these insertion holes are inserted into the pair of bolts, and a fastening piece installed on a reinforcing bar mounted on the first recess is used.
Each of the pair of bolts protruding from the insertion hole of the fastening piece is screwed into the reinforcing bar of the first recess and the assembling member of the second recess is pressed against the reinforcing bar of the fastening piece. Equipped with a pair of nuts for fastening to
The fastening piece is formed with a notch groove for engaging with the reinforcing bar so as to be located between the pair of insertion holes.
The notch groove is formed with the same groove width from the groove bottom to the groove opening, the groove width at the groove opening is set to be smaller than the outer diameter dimension of the reinforcing bar, and the groove depth is the notch groove. An assembly hardware characterized in that a gap is set between the reinforcing bar engaged with the steel bar and the bottom of the groove. The fastening piece is cross-sectionally formed from a substrate portion on which the nut is fixed and a pair of wall plate portions integrally formed on both sides of the substrate portion along the length direction of the reinforcing bar and in which the notch groove is formed. The assembly hardware according to claim 1 or 2, characterized in that it is formed in a character shape. The assembly hardware according to any one of claims 1 to 3, wherein the pair of bolts intersect the reinforcing bar at a substantially right angle when the fastening piece is fastened to the reinforcing bar with the nut.

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