JP5147446B2 - Restraint bar - Google Patents

Description

  The present invention relates to a restraint reinforcing bar, and more particularly, to a restraint reinforcing bar having a fixing plate at the tip.

  An ordinary restraint reinforcing bar has a configuration in which both ends are bent in a U-shape and the main muscle or the strap is arranged inside the bending portion to prevent the extension of the main muscle or the strap. This type of restraint reinforcing bar uses a reinforcing bar bending device because it is impossible to dispose the main reinforcing bar or band reinforcing rod inside the restraining reinforcing bar when both ends are bent into the above-mentioned shape in advance (Patent Document 1). However, it is very cumbersome to bend the tip with the reinforcing bars after placing the main bars or straps, because the tips must be bent by a reinforcing bar bending device for all of the infinite number of restrained reinforcing bars. .

Therefore, in order to solve such a problem, the conventional constrained reinforcing bar has a configuration in which one end of the reinforcing bar is curved in advance and a retaining plate (which corresponds to a fixing plate) is provided at the other end (Patent Document 2). In addition to fixing the fixing plate to both ends of the reinforcing bar (Patent Document 3), which has been subjected to hot upsetting at both ends of the reinforcing bar to form an enlarged diameter portion (this corresponds to the fixing plate), There existed what was set as the structure which attaches a rod-shaped member (patent document 4).
JP-A-10-85843 (page 3-5, FIG. 1) JP-A-10-196120 (page 3, FIG. 1) JP 2000-257209 A (page 4-5, FIGS. 1 and 8) Japanese Patent Laying-Open No. 2005-42425 (page 5-6, FIG. 1)

  Among the above, in the first conventional example (Patent Document 2), as a configuration for providing the fixing plate at the other end of the reinforcing bar, a male screw is engraved near the other end of the reinforcing bar, and the male plate is provided on the fixing plate. A hole for inserting a screw portion was provided, and the screw portion could be tightened by a nut inserted into the hole and screwed into the male screw portion protruding from the surface of the fixing plate.

  However, since the constrained reinforcing bar having such a configuration is screwed with a male screw at the other end of the reinforcing bar, the pitch diameter of the male screw part is smaller than the outer diameter of the main part of the reinforcing bar, and the strength of the constraining reinforcing bar should be possessed. The question remained whether it could be maintained. And what can be considered as a measure for maintaining the strength is that the diameter of the thread groove of the male screw portion is at least the outer diameter required for the constraining rebar, and for that purpose, the constraining rebar that is thicker than usual. The problem of having to use was expected.

  In addition, the second conventional example (Patent Document 3) is to form the fixing plate by hot upsetting both ends of the reinforcing bar, although there is no problem with the strength by integration with the reinforcing bar main body part, Since fixing plates are formed at both ends of the reinforcing bar before construction, especially in the case of a configuration in which a locking projection is provided on the peripheral edge of the fixing plate, when restraining the restrained reinforcing bar (main or strip), In order for the constrained reinforcing bar to get over the locking projection, it is necessary to bend the constrained reinforcing bar within the range of elastic deformation, and the vicinity of the part where the constrained reinforcing bar is already restrained or due to binding with other reinforcing bars In the vicinity of the place where the fixing has been completed, it cannot be easily elastically deformed, leaving a problem in workability.

  Further, the third conventional example (Patent Document 4) has a configuration in which the fixing plate and the restraining rebar are fixed by hot upsetting or friction welding. However, when the fixing plate is configured by upsetting forging, it is difficult to drill a holding hole after that, and when using friction welding, the fixing force varies depending on the degree of pressure welding. The work by an engineer would be required. In addition, regarding the fixation by welding, a welding technique is required, and the strength maintenance inspection cannot be judged from the appearance, which has inherent quality control difficulties.

  In any of the above-described conventional examples, no proposal has been made to secure the cover thickness from the fixing plate, and it is presumed that it is presumed that the conventional spacer is installed on the main bar or the band bar. can do. However, the conventional spacer is appropriately installed after the construction of the reinforcing bar, but its fixing force is not sufficient, and it is expected that the spacer is detached by the inflow pressure when placing concrete.

  The present invention has been made in view of the above-described points, and the object of the present invention is to be able to easily restrain the restrained reinforcing bar and to determine the strength of the fixing plate from the appearance, It is to provide a restrained reinforcing bar to which a spacer can be attached according to a place to be arranged.

Therefore, the present invention provides a reinforcing bar having fixing plates at both ends, wherein the fixing plate includes a reinforcing bar connecting hole capable of loosely fitting the binding reinforcing bar main body, and a rod-shaped member connecting hole provided adjacent to the reinforcing bar connecting hole. A rod-shaped member that is fixed while being inserted into the rod-shaped member connection hole, and a spacer provided at the tip of the rod- shaped member, and the restraint reinforcing bar main body has a portion that is appropriately spaced from the tip in the radial direction. A bulging first bulging portion and a second bulging portion having a distal end bulging in a radial direction, and the reinforcing plate connecting hole of the fixing plate is inserted into the constraining reinforcing bar main body, The gist of the present invention is a constrained reinforcing bar which is arranged between the first bulging portion and the second bulging portion of the reinforcing bar main body.

  According to the above configuration, since the fixing plate is sandwiched between the first bulging portion and the second bulging portion at the tip of the reinforcing bar, the fixing plate is fixed at the tip of the reinforcing bar. The first bulging portion and the second bulging portion are not formed from the beginning, and after the second bulging portion is formed, the reinforcing bar connecting hole of the fixing plate is inserted through the reinforcing bar tip. In addition, the above-described configuration can be realized by forming the first bulging portion.

  According to the above configuration, the spacer is provided on the rod-like member protruding from the fixing plate fixed to both ends of the reinforcing bar, and the length from the leading end of the spacer to the fixing plate is matched with the cover thickness dimension, so that a predetermined thickness is obtained. It is possible to maintain the cover thickness. At this time, since the spacer is held by the fixing plate fixed to the restraining reinforcing bar, it can be avoided that the spacer is detached even by the inflow thickness when the concrete is placed.

  In each of the above inventions, the rod-shaped member can be a rod-shaped member having a configuration including a male screw portion formed by screwing a male screw and two nuts screwed into the male screw portion. Then, the male screw portion of the rod-shaped member is inserted through the rod-shaped member connecting hole of the fixing plate, and is fixed by tightening two nuts from both sides of the fixing plate.

  According to the above configuration, the length of the rod-like member protruding from the fixing plate can be changed depending on the position where the two nuts fasten the fixing plate. At this time, although the male screw is threaded on the surface of the rod-shaped member, the protruding length can be changed without having to rotate the rod-shaped member itself because it can be inserted into the rod-shaped member connecting hole of the fixing plate. Therefore, when projecting parallel to the restraint reinforcing bar main body in order to restrain the restrained reinforcing bar, it can be projected to the appropriate length, and in the structure provided with the spacer, the projecting length matches the cover thickness. Can be adjusted.

  According to the present invention, by causing the bar-like member to protrude in parallel to the main body portion of the restraining reinforcing bar, the restrained reinforcing bar is separated from the fixing plate with respect to the restraining reinforcing bar restrained by the restraining reinforcing bar body and the fixing plate. Can be prevented. Thereby, restraint of a to-be-restricted reinforcing bar can be made easy.

  Further, the fixing portion of the restraint reinforcing bar main body and the fixing plate is in a state where the fixing plate is sandwiched between the first bulging portion and the second bulging portion of the restraining reinforcing bar main body. By observing the state, that is, by observing the degree and thickness of the bulging, the fixing strength of the fixing plate can be judged from the appearance.

  Furthermore, according to the structure which provided the spacer of the rod-shaped member, the spacer installation of the said location can be performed simultaneously by using it for the restraint reinforcement of the location which requires a spacer. And since the spacer installed in this way is continuous with the fixing plate that constitutes a part of the constrained reinforcing bar, it has a stronger fixing force than a spacer that is individually fixed to the main bar or the band. Therefore, the movement or the like can be prevented by the flow down pressure or the like when placing concrete.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a schematic diagram of the first embodiment, and FIG. 1B is a schematic diagram of the second embodiment. As shown in this figure, these embodiments relate to a restraint reinforcing bar A provided with fixing plates 2 and 3 at both ends of the restraint reinforcing bar main body 1. In any of the embodiments, the fixing plates 2 and 3 are disposed between the first bulging portions 11 and 12 and the second bulging portions 13 and 14 of the restraining reinforcing bar main body 1. Reference numerals 2 and 3 are fixedly attached at this position. This mounting method will be described later.

  As shown in FIG. 1A, the first embodiment is a restraining reinforcing bar having a configuration in which rod-like members 4 and 5 are fixed to fixing plates 2 and 3. In this embodiment, bolts 4 and 5 are used as rod-shaped members. The bolts 4 and 5 have male screws engraved on the screw portions 41 and 51. The screw portions 41 and 51 are inserted into the fixing plates 2 and 3, and nuts 42 and 43 are inserted from both sides of the fixing plates 2 and 3. , 52, 53 are fixed by screwing. That is, the fixing plates 2 and 3 are provided with circular through-holes (referred to as rod-shaped member connecting holes) 22 and 32 having a diameter that allows the screw portions 41 and 51 of the bolts 4 and 5 to be inserted. The bolts 4 and 5 can be arranged so that the screw portions 41 and 51 pass through the rod-like member connection holes 22 and 32. Therefore, the nuts 42 and 52 are brought into contact with the surfaces of the fixing plates 2 and 3 by screwing the first nuts 42 and 52 functioning as stoppers in advance to the screw portions 41 and 51 at predetermined positions. In the position, the projecting lengths X1, X2 of the bolts 4, 5 are determined. Then, until the first nuts 42 and 52 are in contact with the fixing plates 2 and 3, the screw portions 41 and 51 are inserted into the rod-like member connecting holes 22 and 32 until the first nuts 42 and 52 come into contact with the fixing plates 2 and 3. The front end portions of the screw portions 41 and 51 protrude from the surface. By screwing the second nuts 43 and 53 into the protruding portions, the two types of nuts 42, 43, 52 and 53 are arranged with the fixing plates 2 and 3 sandwiched therebetween. By screwing the nuts 43 and 53, the two kinds of nuts 42, 43, 52 and 53 sandwich the fixing plates 2 and 3, and the bolts 4 and 5 can be fixed to the fixing plates 2 and 3. It can be done.

  Here, the bolts 4 and 5 are fixed to the fixing plates 2 and 3 as described above, and the projecting length of the bolts 4 and 5 is the position of the first nuts 42 and 52, that is, the screw portions 41 and 52. The length 51 can be easily changed depending on the length to be inserted into the rod-like member connection holes 22 and 32. Therefore, the necessary protrusion lengths X1 and X2 can be obtained by adjusting the positions of the first nuts 42 and 52 according to the size (diameter) of the reinforcing bar to be restrained (this is called the restrained reinforcing bar). It can be done.

  As shown in FIG. 1 (b), the second embodiment is a restraining reinforcing bar having a configuration in which rod-like members 4 and 5 are fixed to fixing plates 2 and 3, and spacers 6 and 7 are provided at the tips thereof. . In the present embodiment, bolts 4 and 5 are used as rod-like members as in the first embodiment. The spacers 6 and 7 are made of concrete and are configured such that the heads of the bolts 4 and 5 are buried in the spacers 6 and 7. In other words, at the manufacturing stage of the spacers 6 and 7, the heads of the bolts 4 and 5 are buried from the concrete surface placed inside the mold of a predetermined shape, and the concrete is solidified in that state. .

  Even in such a configuration, since the screw portions 41 and 51 of the bolts 4 and 5 can be inserted into the rod-like member connection holes 22 and 32 of the fixing plates 2 and 3, the screw portions 41 and 51 are connected to the rod-like member connection. The nuts 32, 43, 52, 53 can be fixed in a state of passing through the holes 22, 32. Since the spacers 6 and 7 used here are for securing the cover thickness, the bolts 4 and 5 are mounted so as to protrude outward from the fixing plates 2 and 3. The bolts 4 and 5 are fixed by the nuts 42, 43, 52, and 53 in the same manner as in the first embodiment, and the first nuts 42 and 52 are in contact with the outer surfaces of the fixing plates 2 and 3. Are arranged as follows. Further, the positions of the first nuts 42 and 52 are adjusted so that the protruding lengths Y1 and Y2 from the outer surface of the fixing plates 2 and 3 to the tips of the spacers 6 and 7 coincide with the predetermined cover thickness. Has been.

  Next, the fixing plates 2 and 3 used in both the above embodiments will be described. 2A is a plan view of the fixing plates 2 and 3, and FIG. 2B is a front view of the fixing plates 2 and 3. As is apparent from these drawings, the fixing plate 2 (, 3) is provided with two through holes 21, 22 (, 31, 32). Among these, the through hole 21 (, 31) having a large inner diameter is a reinforcing bar connecting hole through which the restraint reinforcing bar main body 1 can be inserted, and the through hole 22 (, 32) having a small inner diameter is a rod-shaped member connecting hole.

  The reinforcing bar connecting hole 21 (, 31) has an inner diameter through which the reinforcing bar used in the restraint reinforcing bar main body 1 can be inserted, and can be moved to an arbitrary position of the reinforcing bar by inserting the reinforcing bar. Is. Therefore, the bulging portions 11, 12, 13, and 14 can be freely moved to desired positions around the periphery. Moreover, the thick part 23 is comprised in the circumference | surroundings of the reinforcing bar connection hole 21 (, 31), and while ensuring the intensity | strength at the time of the connection with the restraint reinforcing bar main body 1, when restraining a to-be-restricted reinforcing bar And, it is a structure that can secure the strength that can withstand the reaction force received from the restrained reinforcing bars.

  The rod-like member connection holes 22 (, 32) have an inner diameter through which the rod-like members (bolt male thread portions) 41, 51 can be inserted, as described above. The center line of the rod-shaped member connection hole 22 (, 32) is parallel to the center line of the reinforcing bar connection hole 21 (, 31), and the bolt inserted and fixed in the rod-shaped member connection hole 22 (, 32). 4 and 5 are maintained in a state parallel to the restraint reinforcing bar main body 1. Further, the rod-shaped member connection holes 22 (, 32) are appropriately spaced from the reinforcing bar connection holes 21 (, 31). When restraining the restrained reinforcing bars, the restraint reinforcing bar main body 1 and the rod-like members 4, 5 The constrained reinforcing bars can be placed in the middle.

  Next, a method for fixing the fixing plates 2 and 3 to the main bar 1 will be described. As shown in FIG. 3, a deformed reinforcing bar is used as the restraining reinforcing bar main body 1, and both ends thereof are bulged to constitute the first and second bulging portions 11, 12, 13, and 14.

  Therefore, first, as shown in FIG. 3A, the periphery of the portion (arrow portion in the figure) where the first bulging portions 11 and 12 are to be formed is heated from the tip 1a of the restraint reinforcing bar main body 1. This heating position is a position where the range Z, which is the sum of the length corresponding to the thickness of the fixing plates 2 and 3 and the length that can form the second bulging portions 13 and 14, is left on the tip 1a side. Select. And after the said location is fully heated, as shown in FIG.3 (b), a heating part is shrunk in a length direction by adding compressive force to the axial direction of restraint reinforcing bar main body 1. As shown in FIG. Along with this, the excess portion bulges out to form a bowl shape. Thereby, the 1st bulging parts 11 and 12 are formed.

  Next, as shown in FIG. 3 (c), the reinforcing bar connecting holes 21 and 31 of the fixing plates 2 and 3 are inserted from the front end 1 a of the restraining reinforcing bar main body 1, and the fixing plates 2 and 3 are moved to the first bulging portion 11. , 12 and the restraint rebar main body 1 positioned on the tip 1a side of the fixing plates 2 and 3 is further heated. The restraint rebar main body 1 on the tip side of the fixing plates 2 and 3 is a portion (arrow portion in the figure) that should constitute the second bulging portions 13 and 14, and after the portion is sufficiently heated, As shown in FIG. 3D, by compressing the restraint reinforcing bar main body 1 in the axial direction from the tip 1a again, a hook-like portion bulging out in the periphery is formed as the heated portion contracts. It is. These hook-shaped portions are the second bulging portions 13 and 14.

  Instead of the above-described method, the fixing plates 2 and 3 are inserted into the restraining reinforcing bar main body 1 in advance, and then the second bulging portions 13 and 14 are formed first, and the fixing plates 2 and 3 are connected to the second reinforcing plate 2 and 3. It is also possible to employ a method of forming the first bulging portions 11 and 12 while abutting against the bulgings 13 and 14. In the case of this method, since the second bulging portions 13 and 14 are already formed when the first bulging portions 11 and 12 are formed, the position to be bulged can be easily selected.

  In this way, the fixing plates 2 and 3 are sandwiched between the first and second bulging portions 11, 12, 13, and 14, so that the fixing plates 2 and 3 receive the insertion of the restraining rebar main body 1, but Since it cannot move in the axial direction, it can be configured to be integrated with the constrained reinforcing bar main body 1. Further, the fixing state of the fixing plates 2, 3 by the bulging portions 11, 12, 13, 14 can be determined by observing the bulging state of the bulging portions 11, 12, 13, 14 from the outside. It becomes possible. In order to function as the restraining reinforcing bar A, the holding force of the fixing plates 2 and 3 by the second bulging portions 13 and 14 is important, so the first bulging portions 11 and 12 are fixed to the fixing plate 2. , 3 for fixing the position and angle, and may be in a slightly smaller bulging state than the first bulging portions 13 and 14.

  Since the configurations of the first and second embodiments of the present invention are as described above, when the first embodiment is used, the restrained reinforcing bars 100 and 200 are restrained as shown in FIG. It is positioned between the main body 1 and the rod-like members 4 and 5. At this time, since the restrained reinforcing bars 100 and 200 are continuous long reinforcing bars, the restrained reinforcing bars 100 and 200 are restrained when the rod-like members 4 and 5 are attached to the fixing plates 2 and 3 before arrangement. It becomes difficult.

  Therefore, the fixing plates 2 and 3 are arranged so as to abut against the restrained reinforcing bars 100 and 200 in a state where the rod-like members 4 and 5 are not mounted, that is, only the restraining reinforcing bar main body 1 and the fixing plates 2 and 3. (FIG. 4A). After that, by attaching the rod-like members 4 and 5, the restrained reinforcing bars 100 and 200 cannot be detached from the fixing plates 2 and 3 (FIG. 4B). That is, basically, the restrained reinforcing bars 100 and 200 are restrained by the fixing plates 2 and 3, and when the restrained state collapses (the restrained reinforcing bars 100 and 200 are separated from the restraining reinforcing bar 1). In this case, the restrained reinforcing bars 100 and 200 move on the surfaces of the fixing plates 2 and 3, but the moving range is limited by the bolts (rod-like members) 4 and 5, and they are detached from the fixing plates 2 and 3. It can be prevented.

  Note that the length of the bolts (rod-like members) 4 and 5 that should protrude in the opposite direction from the fixing plates 2 and 3 varies depending on the size of the restrained reinforcing bars and the like. By adjusting the screwing position, the bolts (rod-like members) 4 and 5 can be easily and smoothly mounted in a state where the restrained reinforcing bars are restrained.

  Even when the second embodiment is used, the restrained reinforcing bars 100 and 200 are restrained by the fixing plates 2 and 3 as shown in FIG. At this time, when the spacers 6 and 7 are attached in advance, the second nuts 43 and 53 and the tip portions of the screw portions 41 and 51 for attachment protrude from the inner surfaces of the fixing plates 2 and 3, so Restraint of the restraining reinforcing bars 100 and 200 becomes difficult.

  Therefore, also in this embodiment, the spacers 6 and 7 are mounted after the restrained reinforcing bars 100 and 200 are restrained (FIG. 5A). At this time, the spacers 6 and 7 are provided not to face the fixing plates 2 and 3 but to protrude outward from the opposite surface (outer surface), so that the bolts (rod-like members) 4 and 5 are fixed to the fixing plate 2. , 3 is inserted from the outside. At that time, in order to adjust the protruding length of the spacers 6 and 7 to the cover thickness, the screwing position of the first nuts 42 and 52 is adjusted in advance so that the adjustment at the time of mounting can be omitted easily and easily. Smooth installation can be realized.

  It should be noted that the restrained reinforcing bars 100 and 200 are positioned between the restraining reinforcing bar main body 1 and the second nuts 43 and 53 according to the use mode as described above. When collapsed (when the restrained reinforcing bars 100 and 200 are separated from the restraining reinforcing bar 1), the restrained reinforcing bars 100 and 200 move along the inner surfaces of the fixing plates 2 and 3. The second nuts 43 and 53 (in some cases, the ends of the bolts 4 and 5) are hooked and the function of maintaining the restrained state is exhibited (FIG. 5 (b)). In addition, the spacers 6 and 7 are firmly attached to the fixing plates 2 and 3 by the above-described usage mode. There is no easy detachment from 3. Since the fixing plates 2 and 3 are fixed to the restrained reinforcing bars 100 and 200 via the restraining reinforcing bar main body 1, the restraining state of the restraining reinforcing bar main body 1 with the restrained reinforcing bars 100 and 200 does not collapse. As far as the spacers 6 and 7 are concerned, they do not leave these reinforcing bars.

  The embodiment of the present invention is as described above, but various modes can be taken without departing from the spirit of the present invention. For example, in the above-described embodiment, the example in which the bolts 4 and 5 are used as the rod-shaped members has been shown. However, the material, outer diameter, screw pitch, and the like of the bolts 4 and 5 are determined by standards, and are not necessarily optimal for implementation. Not always. Therefore, when using a rod-shaped member having a material, an outer diameter, etc. necessary for the implementation of the present invention, a rod-shaped member having an appropriate size is used, and a portion in which the screw portions 41 and 51 are configured is adopted. be able to. The shapes of the spacers 6 and 7 can be changed as appropriate depending on the cover thickness and the like.

  A configuration in which female screws are provided in the rod-like member connecting holes 22 and 32 of the fixing plates 2 and 3 is also conceivable. In this case, the rod-like members 4 and 5 are rotated by rotating the whole rod-like members 4 and 5. Moreover, in order to adjust the protruding length, means such as changing the rod-like members 4 and 5 themselves or appropriately adjusting the screwing state at the time of mounting must be taken. , 5 can be used to freely select the projecting length, it is necessary that the fixing plates 2 and 3 have a structure in which a female screw is not engraved. Further, in order to engrave female screws on the fixing plates 2 and 3, a threading step is required when processing the fixing plates 2 and 3, and there is a risk of increasing the processing cost. It is preferable that

(A) is explanatory drawing which shows 1st embodiment of this invention, (b) is explanatory drawing which shows 2nd embodiment of this invention. (A) is a top view of a fixing plate, (b) is a front view. It is explanatory drawing which shows the procedure which mounts a fixing plate to a restraint reinforcement main body. It is explanatory drawing which shows the usage condition of 1st embodiment. It is explanatory drawing which shows the usage condition of 2nd embodiment.

Explanation of symbols

1 Restraint bar body 2, 3 Fixing plate 4, 5 Bolt (bar-shaped member)
6, 7 Spacers 11, 12 First bulging portions 13, 14 Second bulging portions 21, 31 Reinforcing bar connecting holes 22, 32 Bar-shaped member connecting holes 41, 51 Screw portions 42, 52 First nuts 43, 53 Second nut 100, 200 Restraint rebar A Restraint rebar

Claims (2)

In the restraining reinforcing bar having fixing plates at both ends, the fixing plate includes a reinforcing bar connecting hole into which the restraining reinforcing bar main body can be loosely fitted, a bar-like member connecting hole provided adjacent to the reinforcing bar connecting hole, and the bar-like member connecting hole. And a spacer provided at the tip of the rod-like member, and the restraint reinforcing bar main body is a first bulging portion at an appropriate distance from the tip in the radial direction. And a second bulging portion whose tip is bulged in the radial direction, and a reinforcing bar connecting hole of the fixing plate is inserted into the constraining reinforcing bar main body, A constrained reinforcing bar, which is arranged between the bulging portion and the second bulging portion. The rod-shaped member is a rod-shaped member provided with a male screw portion formed by screwing a male screw and two nuts screwed into the male screw portion, and the male screw portion of the rod-shaped member is connected to the fixing plate. The restraint reinforcing bar according to claim 1, wherein the nut is tightened from both sides of the fixing plate while being inserted into the rod-like member connection hole.

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