JP2009052325A - Reinforcing metal fitting for reinforced concrete beam with hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing metal fitting for reinforced concrete beam with hole capable of making its outer diameter smaller so as to lower the height of a beam possible, capable of adjusting the position of stirrups so that the relative position of the stirrups and a sleeve is optimum, also capable of exhibiting sufficient reinforcing effect by integrally cooperating with the stirrups. <P>SOLUTION: The reinforcing metal fitting consists of a frame-shaped body 3a formed by bending a bar steel for reinforced concrete, an upper pressing means 2 which projects levers 2b, 2c and 2d downward from the almost central part of a bar body 2a so as to be able to abut on the upper face of the sleeve B and which can be attached to the upward part of the frame body 3a, and a lower supporting means 3b which projects a supporting lever 3c upward from the almost central part of the bar body 3a so as to support the under face of the sleeve B with the supporting lever 3c and which is locked to the downward part of the frame body 3a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforcing metal fitting used for reinforcing a hole portion of a beam in reinforcement of a reinforced concrete perforated beam.

  Reinforced concrete beams are generally reinforced with reinforcing bars called stirrups, but in perforated beams with through-holes in the beam, reinforcing metal fittings are provided to reinforce around the hole. It is designed to prevent shear cracks in the concrete around.

  An example of use of a conventional reinforcing bracket for a reinforced concrete perforated beam is shown in FIGS.

  That is, the reinforcing metal fitting A is composed of an inner / outer multiple ring body a made of steel bars for reinforced concrete and two connecting rods b and b projecting from the lower part of the ring body a toward the center part. In the concrete form c for placement, it is installed by being bound to the stirrup d of the beam.

  A cylindrical sleeve B for forming a hole in the beam passes through the annular body a and is supported at the distal ends of the connecting rods b and b.

  In addition, the rib stirrup d of the beam is generally arranged on the left and right side portions near both ends of the sleeve B with a predetermined distance from the sleeve B.

  As an example of a reinforcing metal fitting for such a reinforced concrete perforated beam, a plurality of annular bodies are formed by a common bar, and the annular bodies intersect at the inner and outer transition portions, corresponding to the outermost annular body. There is known an example in which both end portions of the rod body at a location are bent inward and welded to the inner annular body next to the outermost annular body (for example, Patent Document 1).

Japanese Patent No. 3556506

  In a high-rise building, there is a strong demand to keep the beam height low. However, a reinforcing ring made of a reinforced concrete perforated beam described in Patent Document 1 is composed of a ring of multiple rings. There was a problem that the height of the beam could not be lowered because of the large.

  In addition, the reinforcing metal fittings for reinforced concrete perforated beams are used in combination with the stirrups on both sides of the sleeve of the opening to provide a reinforcing effect. The vertical streaks of these stirrups are placed about 50 mm away from the sleeve. It is preferable. However, in reality, the arrangement of the streaks is not uniform, and there is a problem in that a problem may occur in the connection with the reinforcing bracket.

  Further, the conventional reinforcing metal fitting has a problem that the holding and fixing force of the sleeve is weak, and therefore the sleeve may rotate.

  Furthermore, the conventional reinforcing metal fitting has a problem that it is difficult to mount and fix to the sleeve at the middle portion of the sleeve where the stirrup is not arranged.

  The present invention solves these problems, and can reduce the outer diameter of the reinforcing bracket to reduce the height of the beam, and forcibly arrange the stirrups on both sides of the sleeve so that the distance between the stirrups becomes a predetermined value. It is another object of the present invention to provide a reinforcing bracket for a reinforced concrete perforated beam that can be easily fixed to a sleeve and attached to an intermediate portion of the sleeve.

  In order to achieve the above-mentioned object, the present invention bends a rod body into a frame shape, and a frame-like body formed so that a sleeve can be inserted into the frame shape, and a contact rod projects downward from a substantially central portion of the rod body. The upper presser means that can be brought into contact with the upper surface of the sleeve by the corresponding contact and can be attached to the upper portion of the frame-like body, and the support rod protrudes upward from the substantially central portion of the rod body. The lower surface of the sleeve is formed so as to be able to be supported by scissors, and comprises a lower support means engaged with the lower part of the frame-like body.

  According to the present invention, the height of the reinforced concrete perforated beam can be reduced, and the distance between the stirrups on both sides of the sleeve can be forced to be a predetermined value. Can be easily attached and can be applied to sleeves of various outer diameters, and there is an effect that it is possible to provide a reinforcing metal fitting for a reinforced concrete perforated beam that can be easily fixed to concrete.

  Examples of the best mode for carrying out the present invention will be described below.

  An example of a reinforcing metal fitting for a reinforced concrete perforated beam according to the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a use state of the reinforcing metal fitting 1 of the present invention, wherein B is a hole-forming sleeve, and the sleeve B is made of a PVC pipe or a paper tubular body.

  Further, d is a vertical streak portion of the stirrup that becomes the skeleton of the beam, and is disposed on both sides of the sleeve B with a predetermined interval (about 50 mm).

  The reinforcing metal fitting 1 includes an upper pressing means 2 for pressing the sleeve B from above and a main metal fitting 3 for inserting the sleeve B and supporting the sleeve B from below.

  A plan view of the upper pressing means is shown in FIG.

  The upper presser means, that is, the upper presser fitting 2 is made of a steel bar such as a steel bar for reinforced concrete. Both ends of one steel bar are bent backward at an angle of about 90 degrees, and engaging portions 2a1 and 2a1 to the barbs are formed at both ends. [The rod-shaped body 2a is formed, and the three contact rods 2b, 2c, and 2d are protruded radially downward so as to be V-shaped at the center of the rod body 2a. It is fixed by welding.

  When the sleeve B is pressed from above by the upper presser fitting 2, the center contact bar 2b is set to contact the upper surface of the sleeve B on the center line of the sleeve B. 2c and 2d are set so as to come into contact with the upper side surface of the sleeve B from the left and right sides of the center line of the sleeve B.

  Next, the structure of the body fitting 3 will be described.

  FIG. 3 is a perspective view of the main body fitting 3. The main body fitting 3 is composed of a rectangular frame-like body 3a and lower support means, that is, a lower support fitting 3b which is engaged or welded to the lower part thereof.

  The frame 3a is made of a steel rod such as a steel bar for reinforced concrete, and a single steel rod is bent into a quadrangle to form a single frame-shaped portion 3a1 large enough to allow the sleeve B to be inserted, and both ends of the steel rod meet. At each corner, the end portions are folded outwardly into U-shapes to form U-shaped portions 3a2, 3a2, and these U-shaped portions 3a2, 3a2 are brought into contact with each other at the corners to form a sturdy frame. Form 3a is formed.

  The lower support bracket 3b is also made of an iron bar such as a steel bar for reinforced concrete, and both ends of one iron bar are bent backward at an angle of about 90 degrees, and engaging portions 3b1, 3b1 to the stirrup d are provided at both ends. A [shaped rod body 3b is formed, and a V-shaped bearing rod 3c is protruded upward from the central portion of the rod body 3b, and is fixed by welding to form a lower bearing bracket 3b.

  Here, the frame-shaped body 3a is arranged like a rhombus whose sides are inclined, and the U-shaped portion 3a2 is formed so as to protrude to the side of the rhombus. The lower support metal fitting 3b is overlapped and welded to the lower half of two oblique sides located below, and the main body metal fitting 3 is formed integrally.

  Next, the usage method and the effect of the reinforcing metal fitting 1 of the present embodiment will be described with reference to FIG.

  In the reinforcement of the reinforced concrete perforated beam, if the position of the hole is determined, the stirrup d and the reinforcing metal fitting 1 are arranged in accordance with the position of the hole.

  That is, the sleeve B for forming the hole is inserted through the body fitting 3 and the sleeve B is supported by the V-shaped bearing rod 3c of the body fitting 3, so that the body fitting 3 and the stirrup d Tie with a wire.

  At this time, since there are engaging portions 3b1, 3b1 to the staggered line d at both ends of the rod body 3b included in the main body metal fitting, the operator positions the staggered line d so as to engage with the engaging parts 3b1, 3b1. Will come to adjust.

  As a result, the relative positions of the stirrup d and the sleeve B are also optimized.

  Next, the upper presser fitting 2 is installed on the upper portion of the sleeve B.

  That is, the top end portions of the three abutments 2b, 2c, and 2d of the upper presser fitting 2 are brought into contact with the upper surface portion of the sleeve B, and the engaging portions 2a1 and 2a1 at both ends of the upper presser fitting 2 are provided. The sleeves B are respectively engaged with the stirrups d, d on both sides of the sleeve B and bound with a wire.

  Further, the upper presser fitting 2 and the main body fitting 3 are united together by a wire.

  Thus, the reinforcing metal fitting 1 is bound to the stirrup d and exhibits a great reinforcing effect in cooperation with the stirrup.

  In addition, since a pair of U-shaped portions 3a2, 3a2 project from the corners of the frame-shaped body 3a of the reinforcing metal fitting 1, the U-shaped portions 3a2, 3a2 make it possible to fix the reinforcing metal fitting 1 to the concrete. The effect of improving was obtained.

  It is also possible to use the reinforcing metal fitting 1 at the middle part of the beam without the streak. In this case, the sleeve B is sandwiched between the upper presser fitting 2 and the lower support metal fitting 3b of the main body metal 3 from above and below with a wire. What is necessary is just to unite.

  In this embodiment, the U-shaped parts 3a2, 3a2 are in contact with each other at the corners. However, the U-shaped parts 3a2, 3a2 may be welded together at the corners.

  Furthermore, in this embodiment, the frame-like body 3a forming the main body metal fitting 3 is a quadrilateral, but this may be a polygon other than a quadrangle, or it may be a circular or elliptical frame-like body, or a corner portion. The both ends of the iron bar may be welded without forming the U-shaped part.

  In this embodiment, the number of contact rods that contact the upper surface of the sleeve B is three. However, other than three contact rods may be used, and the sleeve B is supported. Although the bearing rod 3c provided on the lower support fitting 3b has a V shape, two or more bearing rods protruding radially upward may also be used, or other than a radial shape, for example, || A bearing rod protruding upward may be used.

  INDUSTRIAL APPLICABILITY The present invention is used for reinforcing metal fittings around a hole in a reinforced concrete perforated beam having a through hole in the beam in reinforcement of a reinforced concrete building.

It is a front view of the use condition of the reinforcement metal fitting of this invention. It is a top view of a part of said reinforcement metal fitting and an upper holding metal fitting. It is a perspective view of a part of said reinforcement metal fitting and a main body metal fitting. It is a front view of the use condition of the conventional reinforcement metal fitting. It is a side view of the use condition of the conventional reinforcement metal fitting same as the above.

Explanation of symbols

1 Reinforcing bracket 2 Upper presser means (upper presser bracket)
2a1, 3b1 Engageable parts 2b, 2c, 2d Abutment rods 3a Frame-like body 3a2 U-shaped part 3b Lower support means (lower support bracket)
3c bearing rod B sleeve d stirrup

Claims (5)

  The rod body is bent into a frame shape so that the sleeve can be inserted into the frame shape, and the contact rod protrudes downward from the substantially central portion of the rod body, so that the corresponding contact rod moves to the upper surface of the sleeve. An upper presser means that is formed so as to be able to abut and can be attached to the upper portion of the frame-like body, and a support rod is projected upward from a substantially central portion of the rod body so that the lower surface of the sleeve can be supported by the support rod. A reinforcing metal fitting for a reinforced concrete perforated beam comprising lower support means attached to a lower portion of the frame-like body.   2. The reinforced concrete according to claim 1, wherein both ends of the bar body of the upper presser means or the lower support means are bent backward to form engaging portions that can engage with the stirrups arranged on the left and right sides of the sleeve. Reinforcing bracket for perforated beams.   The reinforcing bracket for a reinforced concrete perforated beam according to claim 1, wherein the abutment rod is formed of a plurality of ribs and projects radially downward obliquely.   The reinforcing bracket for a reinforced concrete perforated beam according to claim 1, wherein the bearing rod is composed of a plurality of rods and projects radially upward obliquely.   The frame-like body is formed in a square shape, and both end portions of the rod body are folded outwardly into U-shapes at one corner portion thereof to form U-shape portions, and these U-shape portions are formed into the corner portions. The reinforcing metal fittings for reinforced concrete perforated beams according to claim 1, which are in contact with each other.

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