JP2015124525A - Fixation hardware - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fixation hardware, fixable to irregular-shaped bar steel, without using an exclusive machine.SOLUTION: The fixation hardware comprises a pair of substantially semi-cylindrical couplers for covering an almost half by an almost half among the circumferential total length in an outer peripheral surface of an irregular-shaped bar steel tip part, a taper sleeve for forming an inner taper part on an inner surface to be fitted to its outer surface side so that the pair of couplers hold a cylindrical shape, and a fastening nut for pushing the taper sleeve inside, and the fastening nut comprises a fixation part on an outer surface, and comprises a female screw part on an inner surface, and the pair of couplers of becoming a cylindrical shape comprise a node groove fitted to a node of the irregular-shaped bar steel on the inner surface, and the outer surface comprises an outer taper part corresponding to an inner taper part and diametrically reducing toward the tip direction of the irregular-shaped bar steel and a male screw part formed in a tip side position relative to the outer taper part and threadedly engaging the fastening nut.

Description

  The present invention relates to a fixing hardware attached to a front end of a deformed steel bar.

  Conventionally, methods for fixing reinforcing bars to concrete are roughly divided into a method by simply attaching the reinforcing bars to the concrete, a method for bending the ends of the reinforcing bars to form hooks, and a method for mechanical fixing. Among them, a fixing metal as proposed in the patent document described below is used for the mechanical fixing method.

  Patent Document 1 discloses a fixing member for a screw rebar composed of a fixing plate in which a screw portion is internally engraved and a fixing material in which the fixing portion is integrated, and a fixing nut in which the screw portion is internally engraved. It is characterized in that a fixing material and a fixing nut are screwed into the reinforcing bar.

  Japanese Patent Application Laid-Open No. H10-228688 discloses a fixing metal fitting for a deformed bar steel, in which a screw body is attached to an end portion of the deformed bar steel by friction welding and a fixing plate is screwed to the screw body.

JP-A-11-200558 Utility Model Registration No. 3069384

  In the configuration of Patent Document 1, since the fixing member is screwed into the screw node of the screw rebar, there is a problem that it cannot be adopted for the deformed steel bar having no screw node.

  In the configuration of Patent Document 2, a threaded portion is attached to the end of the deformed steel bar by friction welding, but there is a problem that it is necessary to introduce expensive dedicated equipment for friction welding.

  The present invention has been developed on the basis of the above situation, and an object thereof is to provide a fixing hardware that can be fixed to a deformed steel bar without using expensive dedicated equipment.

  The present invention for solving the above-described problems is a deformed steel bar having two ribs extending in the longitudinal direction and a plurality of nodes joining the two ribs on the outer surface of a cylindrical steel bar body. A pair of substantially semi-cylindrical couplers that cover approximately half of the total circumferential length of the outer peripheral surface of the deformed steel bar tip, and the pair of couplers hold the cylindrical shape. A taper sleeve having an inner taper portion formed on the inner surface for fitting to the outer surface side, and a fastening nut for pushing the taper sleeve. The fastening nut has a fixing portion on the outer surface and a female screw on the inner surface. The pair of couplers that have a cylindrical shape has a groove on the inner surface that fits into the node of the deformed steel bar, and the outer surface corresponds to the inner taper part and faces the tip of the deformed steel bar. The outer taper part that is reduced in diameter and the outer tape Characterized in that it has a male screw portion for screwing the clamping nut is formed in a position on the distal end side than the part.

  Then, in order to easily and accurately fit the deformed steel bar and the coupler groove, the deformed steel bar to be attached is connected to the steel bar body in a circular shape through two ribs. It is preferable that the positions in the longitudinal direction are aligned.

  According to the present invention, the male threaded portion side of the pair of couplers is arranged so as to come to the front end portion side of the deformed steel bar, and the inner surface side of the pair of couplers is covered so as to cover the outer surface of the front end portion of the deformed steel bar, After that, since the pair of couplers can be fixed to the deformed steel bar by the taper sleeve and the fastening nut, an expensive dedicated machine is not required for attaching the fixing hardware to the end of the deformed steel bar.

  In addition, in the case of a configuration in which the section of the deformed steel bar to be attached is arranged with the position in the longitudinal direction of the steel bar body so as to be continuous in a circular shape via two ribs, the section of the deformed steel bar and the coupler Therefore, the workability when fixing the fixing hardware to the deformed steel bar is improved.

FIGS. 4A and 4B are a front view and a right side view of a deformed steel bar to which a fixing hardware according to the present invention is attached. (A), (b) figure is the front view and left view which show the use condition of the fixing metal object by this invention. It is a longitudinal cross-sectional view which shows the use condition of the fixing metal object by this invention. FIGS. (A), (b), (c), and (d) are a plan view, a front view, a right side view, and a bottom view of a coupler. FIG. 3 is an enlarged longitudinal sectional view showing a fitting state between a section of a deformed steel bar and a joint groove on the inner surface of a coupler when a fixing metal fitting according to the present invention is attached. (A), (b), (c) is a front view of a taper sleeve, a right view, and sectional drawing. (A), (b), (c) is a front view, a left side view, and a sectional view of a fastening nut.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. First, the deformed steel bar A to which the fixing hardware of the present invention is attached will be described. The deformed steel bar A is manufactured by a hot continuous rolling facility in which a plurality of two-roll mills in which a pair of two rolling rolls are arranged to face each other are arranged in series. As shown in FIGS. 1 (a) and 1 (b), the shape of the deformed steel bar A is such that the rib A2 extending in the longitudinal direction of the outer surface of the columnar steel bar body A1 has a circumference based on the center of the circular cross section of the steel bar body A1. It is provided every 180 degrees along the direction, and a large number of nodes A3 are provided between the two ribs A2 and A2 at intervals in the longitudinal direction of the outer surface of the steel bar body A1. Each node A3 has a substantially semicircular shape extending in the circumferential direction, and is orthogonal to each rib A2. Moreover, in the manufacturing stage of the deformed steel bar A, the two grooves A3 and A3 are aligned in the same circumferential direction with respect to the steel bar body A1 by aligning the position of the groove for the groove provided in the circumferential direction of the rolling roll with two rolls. In other words, the longitudinal direction of the steel bar body A1 is such that the two nodes A3 and A3 are continuous in a circular shape via the two ribs A2 and A2. They are arranged in alignment with the direction.

  In addition, the rib A2 of the deformed steel bar A and the node A3 are flush with each other, that is, the outer peripheral surface of the rib A2 and the outer peripheral surface of the node A3 are continuous without a step. Incidentally, between the node A3 and the node A3 adjacent in the longitudinal direction of the deformed steel bar A is formed in an arc shape that is recessed toward the steel bar body A1.

  As shown in FIGS. 2 and 3, the fixing hardware according to the present invention includes a pair of couplers 10, 10, a taper sleeve 20, and a fastening nut 30.

  The coupler 10 has a tensile strength equal to or higher than that of the deformed steel bar A cast with a metal material having a desired strength, such as iron, and has a cross section slightly smaller than a semicircle as shown in FIG. It is a small, substantially semi-cylindrical shape. And when fitting with the deformed steel bar A, the pair of couplers 10 and 10 are formed in a substantially cylindrical shape by making their circumferential end faces face each other. Further, as shown in FIG. 2B, gaps 16 extending along the rib A2 are provided between the pair of couplers 10 and 10 in the circumferential direction.

  The coupler 10 has a plurality of locking projections 14 extending in the circumferential direction at intervals in the longitudinal direction on the inner surface. Further, a node groove 15 is formed between the adjacent locking projections 14, 14. 3 and 5, the shape of the node groove 15 is substantially the same as the shape of the node A3 of the deformed steel bar A, and the shape of the locking projection 14 is also the shape between the adjacent nodes A3 and A3. Is approximately the same.

  As shown in FIG. 4, the coupler 10 has a semi-outer tapered portion 12 a on the outer surface in order from one end in the longitudinal direction (right end in the drawing) to the other end (left end in the drawing). Each has a half male threaded portion 11a. The semi-outer taper portion 12a has an outer diameter that increases toward one end, and an outer taper that expands toward one end when the circumferential end surfaces of the pair of couplers 10 and 10 face each other. Each part 12 is formed. In this embodiment, as shown in FIGS. 4A, 4B, and 4C, one end portion of the semi-outer tapered portion 12a and the intermediate portion in the circumferential direction of the semi-outer tapered portion 12a. Has a surface parallel to the circumferential end surface of the coupler 10 as a pinch holding portion 13 for pinching with a vice or the like. Moreover, the half male thread part 11a forms the male thread part 11 by the end surfaces of the circumferential direction of a pair of couplers 10 and 10 facing each other. In the embodiment, the screw direction of the male screw portion 11 is right-handed as shown in FIGS. 4 (a) and 4 (b).

  The tapered sleeve 20 has a substantially cylindrical shape as shown in FIGS. 3 and 6, and the inner surface corresponds to the outer tapered portion 12, in other words, the same as the taper angle of the outer tapered portion 12. Each has an inner tapered portion 21 of an angle. In FIG. 6, the inner diameter is reduced from one end to the other end.

  As shown in FIGS. 7A and 7B, the fastening nut 30 has a non-circular portion on the outer surface in order from the other end (left end in the drawing) to one end (right end in the drawing). And a polygonal portion 31 (in the figure, a hexagonal shape), which protrudes from the polygonal portion 31, and has an annular ridge 32. In addition, the collar 32 of the present embodiment is used as a so-called fixing portion, and increases the fixing force in the axial direction of the deformed steel bar A against the concrete. And as shown in FIG.7 (c), it has the internal thread part 33 which consists of the thread | thread of the right-hand thread which can be screwed together in the internal thread part 11, as shown in FIG.7 (c).

  The fixing metal as described above is used as follows. First, the pair of couplers 10 and 10 and the deformed bar A are arranged so that the male threaded portion 11 side of the pair of couplers 10 and 10 comes to the tip end side of the deformed bar A, and the inner surfaces of the pair of couplers 10 and 10 On the side, the outer surface of the tip of the deformed steel bar A is covered. At this time, each coupler 10 covers substantially half of the total circumferential length of the outer peripheral surface of the deformed steel bar A, and the position and fitting of the deformed steel bar A accommodated in the pair of couplers 10 and 10 are covered. The matching condition can be confirmed from the gap 16 provided between the pair of couplers 10 and 10 in the circumferential direction. Thereafter, the taper sleeve 20 is passed from the front side of the deformed steel bar A so that the outer taper portions 12 of the pair of couplers 10 and 10 and the taper direction of the inner taper portion 21 of the taper sleeve 20 coincide with each other. The pair of couplers 10 and 10 are brought close to the outer surface of the deformed steel bar A, and the pair of couplers 10 and 10 are held in a cylindrical shape. Then, the fastening nut 30 is screwed into the male screw portions 11 of the pair of couplers 10 and 10 held in a cylindrical shape. In this case, the flange 32 is useful for positioning the tool. Then, as the fastening nut 30 is screwed, the tapered sleeve 20 moves in a direction away from the tip end side of the deformed steel bar A. At this time, since the inner taper portion 21 and the outer taper portion 12 are provided, the pair of couplers 10 and 10 gradually act to tighten the deformed steel bar A in the radial direction, and each locking projection 14 is deformed. As a result, the fixing metal is fixed to the tip of the deformed steel bar A.

  The fixing hardware of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof. For example, in the above embodiment, the shape of the collar 32 is an annular shape. However, the present invention is not limited to this, and a polygonal shape such as a polygon is not a problem in the present invention. Moreover, in the said embodiment, although the polygonal-shaped part 31 which is one of the non-circular shaped parts and the collar 32 were provided in the outer surface of the fastening nut 30, depending on the case, on the outer surface of the fastening nut 30, A configuration having only the polygonal portion 31 is not a problem. However, in this case, since the polygonal portion 31 is used as a fixing portion, the outer diameter of the polygonal portion 31 is larger than the outer diameter of the taper sleeve 20 when it is desired to increase the fixing force on the concrete. It is desirable. Further, the number of the node groove 15 in the coupler 10 and the rib A2 of the deformed steel bar A is not limited.

DESCRIPTION OF SYMBOLS 10 Coupler 11 Male thread part 11a Half male thread part 12 Outer taper part 12a Semi outer taper part 13 Holding part 14 Locking protrusion 15 Node groove 16 Gap 20 Taper sleeve 21 Inner taper part 30 Nut 31 Polygonal part 32 鍔 33 Female thread part A deformed steel bar A1 steel bar body A2 rib A3 section

Claims (2)

On the outer surface of the cylindrical steel bar body is a fixing metal fitting to be attached to a deformed steel bar having two ribs extending in the longitudinal direction and a plurality of nodes joining the two ribs,
Inner taper for fitting a pair of approximately semi-cylindrical couplers covering approximately half of the total circumferential length on the outer peripheral surface of the deformed steel bar tip, and a pair of couplers on the outer surface side so as to hold the cylindrical shape A taper sleeve having a portion formed on the inner surface, and a fastening nut for pushing the taper sleeve;
The fastening nut has a fixing portion on the outer surface and a female screw portion on the inner surface,
The pair of couplers that are cylindrical has a groove on the inner surface that fits into the node of the deformed steel bar, and the outer surface corresponds to the inner taper portion and has an outer diameter that decreases toward the tip of the deformed steel bar. A fixing hardware comprising: a taper portion; and a male screw portion that is formed at a position closer to the tip side than the outer taper portion and is screwed with a fastening nut. 2. The fixing according to claim 1, wherein the nodes of the deformed steel bar to be attached are arranged in alignment with the longitudinal direction of the steel bar body so as to be continuous in a circular shape through two ribs. hardware.

Images