JP2005180175A - Reinforcing fitting for reinforced concrete perforated beam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide, without using a connecting rod as a separate component, a reinforcing fitting which can prevent a relative deformation of an internal and external ring shaped bodies while keeping a workability of bending to form a steel bar. <P>SOLUTION: The reinforcing fitting for the reinforced concrete perforated beam is formed of an internal and external double ring-shaped bodies 2, 3 by bending a steel bar 1. The internal ring-shaped body 2 is a polygon, a plurality of whose edges 2a to d are formed to approximately come into contact with the external ring-shaped body 3. At the same time, both ends 1a, 1b of the steel bar are bent from the sides 3e, 3f of the external ring-shaped body 3 and intersects with the sides 2e, 2f of the internal ring-shaped body 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reinforcing metal fitting disposed around a through hole in a reinforced concrete perforated beam having a through hole for piping, wiring, and the like.

  With respect to reinforced concrete perforated beams, reinforcing metal fittings (reinforcing bars) are arranged around the through hole as a reinforcing means for preventing cracks around the through hole. With respect to this reinforcing metal fitting, as shown in Patent Documents 1 and 2, a so-called “one-stroke writing” shape is known by bending a single metal rod.

  Both of these reinforcing metal fittings described in Patent Documents 1 and 2 are formed by crossing a part of an inner and outer double annular body from one common bar body, and welding both end portions of the bar body. It is formed in an endless shape, thereby obtaining the effect of reducing the number of parts of the material and simplifying the processing.

JP 11-193599 A JP 2000-136597 A

  In the above-mentioned conventional reinforcing metal fittings, the inner and outer double annular bodies are formed from a single common rod body, and only a part of them intersects, so the contact point between the inner annular body and the outer annular body Has only one point of intersection, that is, only one point of support for the inner ring. Therefore, in reality, if the inner and outer annular bodies are connected by welding of the connecting rods and the supporting points are not increased, the inner and outer annular bodies may be relatively deformed by the pressure during concrete placement (outer annular bodies). On the other hand, the inner annular body is twisted cannot be excluded.

  The present invention pays attention to this point, and it is possible to prevent relative deformation of the inner and outer annular bodies while maintaining the workability of bending and forming a single metal rod without using a connecting rod of another part. Proposed reinforcing metal fittings are proposed.

  The reinforcing metal fitting of the present invention is a reinforcing metal fitting for a reinforced concrete perforated beam formed by bending a single metal rod to form an inner and outer double annular body, and at least the inner annular body is polygonal and the polygonal A plurality of corners of the metal rod are substantially in contact with the outer annular body, and both end portions of the metal rod body are bent from the position of the outer annular body and intersect with the sides of the inner annular body.

  In the reinforcing metal fittings of the prior art, the inner and outer annular bodies are in contact with each other at only one point of intersection, and there is no supporting point for the inner annular body in addition to the intersection part, so that the inner annular body is floating inside the outer annular body It is constructed. Therefore, it is difficult to prevent relative deformation of the inner and outer annular bodies unless the connecting rod is connected separately. On the other hand, in the case of the reinforcing metal fitting of the present invention, the inner annular body has a polygonal shape and a plurality of corners thereof are substantially in contact with the outer annular body. Since the corner portion can be fixed to the outer annular body, and thereby a plurality of support points of the inner annular body can be obtained, relative deformation of the inner and outer annular bodies can be prevented even without a connecting rod. Note that “substantially contact” means that there is no problem in fixing even if there is a slight gap of about 5 mm or there is an overlap, and such an error means an allowable range.

  In addition, in the case of the reinforcing metal fitting of the present invention, both end portions of the metal rod are bent from the position of the outer annular body so as to intersect with the side portions of the inner annular body. It also plays a role as an anti-deformation (torsion prevention), and the effect of preventing relative deformation is increasing. In this case, if both end portions of the metal rods cross each other on the opposite side of the inner annular body, the inner annular body can be sandwiched from the opposite sides at both end portions, so that more effective deformation prevention Get functionality.

  In such a reinforcing metal fitting of the present invention, for ease of processing, the inner annular body is a quadrangular shape, and its four corners are substantially in contact with the outer annular body, so that four support points, upper, lower, left and right are obtained. Is good. In this case, the outer annular body may be a circle in which the inner annular body is inscribed. However, considering the ease of processing, each corner of the quadrangle is approximately on the four sides as an octagon. It is preferable to make contact.

  Further, in the reinforcing metal fitting of the present invention, both end portions of the metal rod body intersect with the inner annular body and project inward, and the projecting end portion serves as a sleeve retaining means. This is preferable because it is not necessary to provide a gap. In addition, in this case, a structure for supporting the sleeve holding means with the inner and outer double annular bodies can be obtained, which is advantageous in terms of strength as the sleeve holding means. Further, in the reinforcing metal fitting of the present invention, it is preferable to fix the crossing portion between the both end portions of the metal rod body and the inner annular body by welding, a binding tool or the like because the deformation preventing function is further improved.

  According to the reinforcing metal fitting of the present invention, it is possible to obtain a plurality of support points of the inner annular body by adopting a structure in which the polygonal inner annular body is substantially inscribed in the outer annular body, and in addition, both ends of the metal rod body By bending the outer annular body from the position of the outer annular body and intersecting with the side of the inner annular body, the inner annular body can be provided with a deformation preventing function. The relative deformation preventing function of the inner and outer annular bodies can be remarkably improved while maintaining.

  A preferred embodiment of the reinforcing metal fitting according to the present invention is shown in FIGS. FIG. 1 is a plan view seen from the front, FIG. 2 is a perspective view thereof, and FIG. 3 is a diagram showing a construction state.

  The reinforcing metal fitting in this example has a “one-stroke writing” structure in which a single metal rod 1 is bent to continuously form an inner and outer double annular body composed of an inner annular body 2 and an outer annular body 3. . Then, both end portions 1 a and 1 b of the metal rod 1 are bent from the position of the outer annular body 3 and intersect the inner annular body 2.

  The inner annular body 2 is a square that can be easily processed, in particular, a square in this example, and its four corners 2a, 2b, 2c, and 2d are respectively connected to the four sides 3a, 3b, 3c, and 3d of the outer annular body 3. It is in close contact and can be supported at four points, top, bottom, left and right. One of them, the corner portion 2d and the side portion 3d, has the metal rod body 1 forming the outer annular body 3 shifted to the inner annular body 2 and the metal rod body 1 forming the inner annular body 2 is the outer annular body 3. It is the part which moves to. Therefore, the part is in a state where the corner 2d and the side 3d overlap each other.

  One outer annular body 3 is an octagon that can be easily processed in this example, and every other one of the eight sides, the inner annular body 2 with respect to the four sides 3a, 3b, 3c, 3d. Corners 2a, 2b, 2c, 2d are substantially in contact with each other. In the case of this example, the two ends 3a, 3f of the sides other than the sides 3a, 3b, 3c, 3d with which the corners 2a, 2b, 2c, 2d are substantially in contact with both ends 1a, 1b is bent inward.

  The metal rod end portions 1a and 1b are bent from the side portions 3e and 3f of the outer annular body 3, and function as a deformation stopper by intersecting the two side portions 2e and 2f of the inner annular body 2. In this example, the intersecting portion is welded and fixed, and the function of preventing deformation is improved. The fixing such as welding or binding may be performed at the time of manufacturing the reinforcing metal fitting or may be performed at a construction site. Further, both end portions 1a and 1b of the metal rod intersect the sides 2e and 2f on the opposite sides (front and back) of the inner annular body 2, and the inner annular body 2 is sandwiched from the opposite sides. As a result, a more effective deformation preventing function can be obtained. Furthermore, the both end portions 1a and 1b in this example have a length that intersects the inner annular body 2 and further protrudes inward, and covers the protruding end portions 1c and 1d with a resin cap C, A holding means for the sleeve S (see FIG. 3) is formed. By covering the cap C, both the sleeve S and the projecting ends 1c and 1d can be protected.

  As shown in the construction state of FIG. 3, the reinforcing metal fitting having the above shape is arranged by a binding tool such as a wire on the main reinforcement M forming the beam. That is, the direction of the outer annular body 3 is such that the end portions 1a and 1b are on the lower side, and the side portions 3a, 3b, 3c, and 3d of the inner annular body 2 that are substantially in contact with them. Each corner 2a, 2b, 2c, 2d is fixed to the main muscle M with a binding tool (not shown) such as a wire. As a result, the corner portions 2a, 2b, 2c, and 2d as well as the side portions 3a, 3b, 3c, and 3d are fixed to the main muscle M, and four support points for the inner annular body 2 are secured. Therefore, deformation (twist, distortion, etc.) of the inner annular body 2 is prevented during concrete placement. On the other hand, the metal rod end portions 1a and 1b, which are sleeve holding means, also have a double support structure with the inner annular body 2 and the outer annular body 3, so that they are difficult to deform and have high strength.

The top view of the reinforcement metal fitting which concerns on this invention. The perspective view of the reinforcement metal fitting of FIG. The figure which shows the construction example of the reinforcement metal fitting of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal rod 1a, b Both-ends part 1c, d Protruding end part 2 Inner annular body 2a-d Corner | angular part 2e, f Side part 3 Outer annular body 3a-f Side part

Claims (6)

A reinforcing metal fitting for a reinforced concrete perforated beam formed by bending a single metal rod to form a double ring inside and outside,
At least the inner annular body is polygonal, and a plurality of corners of the polygon are formed so as to be substantially in contact with the outer annular body, and both end portions of the metal rod are bent from the position of the outer annular body, Reinforcing metal fittings characterized by crossing the sides of the body.   The reinforcing metal fitting according to claim 1, wherein both end portions of the metal rod intersect each other on the opposite side of the inner annular body.   The reinforcing metal fitting according to claim 1 or 2, wherein the inner annular body is a quadrangle, and four corners thereof are substantially in contact with the outer annular body.   The reinforcing metal fitting according to claim 3, wherein the outer annular body is octagonal, and each corner portion of the inner annular body is substantially in contact with four sides of the octagon.   The reinforcing metal fitting according to any one of claims 1 to 4, wherein both end portions of the metal rod intersect the inner annular body and project inward, and the projecting ends serve as sleeve holding means. .   The reinforcing metal fitting according to any one of claims 1 to 5, wherein a crossing portion between both end portions of the metal rod body and the inner annular body is fixed.

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