JP3728706B2 - Opening reinforcing material and reinforcing structure for concrete structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a concrete structure that reinforces the periphery of an opening formed in a beam or wall of an RC structure, an SRC structure, or a PC structure (hereinafter collectively referred to as “concrete structure”). The present invention relates to a hole reinforcing material and a reinforcing structure.
[0002]
[Prior art]
When placing ducts and other openings in concrete structures, cross-sectional defects occur in the openings and weaken the strength. Therefore, an opening reinforcement made of a metal material is attached around the openings. Are reinforced.
As shown in FIG. 14, this type of hole reinforcing material is a material in which a closed frame is concentrically arranged, formed by intersecting rectangular frames, or a combination of a ring and a rectangular frame (Japanese Utility Model Laid-Open No. 62-121316, Japanese Utility Model Laid-Open No. 1-157811, Japanese Utility Model Laid-Open No. 3-61023, Japanese Patent Application Laid-Open No. 63-297657, Japanese Patent Application Laid-Open No. 1-165854, (Kaihei 16-16656).
[0003]
[Problems to be solved by the invention]
As is clear from the fact that all of these hole reinforcing materials are symmetrical in the vertical and horizontal directions, they have a common function of uniformly reinforcing the periphery of the hole portion. For this reason, when the opening position, that is, the position where the opening reinforcing material is installed is deviated in the vertical direction from the center of the concrete beam, for example, a difference occurs in the reinforcement of the upper and lower portions of the concrete beam. Specifically, in areas where the distance from the opening position to the beam end is narrow, over-stressing will occur and concrete wraparound tends to be worsened or overdesigned.On the other hand, cracks occur in areas where the distance from the opening position to the beam end is far. And tend to fall into a lack of strength that causes buckling.
[0004]
In addition, in the structure in which the upper and lower portions of the opening are reinforced with one circular or polygonal opening reinforcing material, both proof stress and toughness cannot be satisfied at the same time, and therefore the reinforcing performance is the strength and toughness. It will be decided by the disadvantaged one.
In addition, the conventional hole reinforcing material has a large number of constituent members, and there is a problem that processing is troublesome.
[0005]
[Means for solving problems]
That is, the invention according to claim 1 is a hole reinforcing material for a concrete structure in which the reinforcing material is formed in a closed shape, and an axial direction reinforcing material arranged in the axial direction of the concrete structure and an intersecting direction of the axial direction reinforcing material. A plurality of triangular frame bodies having a closed shape by providing a continuity to each of these reinforcing materials, and superimposing the axial reinforcing materials of the triangular frame bodies In addition, the present invention provides a hole reinforcing material for a concrete structure, wherein each oblique direction reinforcing material is formed by shifting in the axial direction.
The invention according to claim 2, as Oite to claim 1, the axial reinforcement of the triangular frame is a parallel to the axial direction of the concrete structure, each oblique stiffener intersects the triangle It is an opening reinforcing material for a concrete structure, characterized in that a single frame is combined in an upside down direction and formed integrally .
The invention according to claim 3, Oite to claim 2, wherein the upper and lower triangular frame is isomorphic a and same dimensions, a hole reinforcement of concrete structures.
The invention according to claim 4, Oite to claim 2, wherein the upper and lower triangular frame is a combination of and different dimensions in the same shape, a hole reinforcement of concrete structures.
The invention according to claim 5, Oite to claim 2, wherein the upper and lower triangular frame is a combination of and different dimensions in profile, a hole reinforcement of concrete structures.
Invention is the reinforcing structure of the opening portion of the concrete structure to reinforce the reinforcing material to form a reinforcing member in a closed shape placed around the opening, the claims 1, further according to claim 6 5 is used, and one diagonal reinforcement of the triangular frame constituting the aperture reinforcement is perpendicular to the fracture line of the concrete structure, and the other diagonal reinforcement is used. The reinforcing structure for an opening portion of a concrete structure , wherein the opening reinforcing material is arranged around an opening portion that is eccentric so that the directional reinforcing material is positioned in parallel with the fracture line .
[0006]
[Means for Solving the Problems]
That is, the invention according to claim 1 is a hole reinforcing material for a concrete structure in which the reinforcing material is formed in a closed shape, and an axial direction reinforcing material arranged in the axial direction of the concrete structure and an intersecting direction of the axial direction reinforcing material. And a pair of oblique reinforcing members arranged in the above, and each of these reinforcing members is formed in a closed shape by giving continuity to each of the reinforcing members.
Furthermore, the invention according to claim 2 is an opening reinforcing material for a concrete structure in which the reinforcing material is formed in a closed shape, and an axial direction reinforcing material arranged in the axial direction of the concrete structure and an intersecting direction of the axial direction reinforcing material. A plurality of triangular frame bodies having a closed shape by providing a continuity to each of these reinforcing materials, and superimposing the axial reinforcing materials of the triangular frame bodies In addition, the present invention provides a hole reinforcing material for a concrete structure, wherein each oblique direction reinforcing material is formed by shifting in the axial direction.
Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the axial reinforcement of the triangular frame is parallel to the axial direction of the concrete structure, and the oblique reinforcements intersect each other. An opening reinforcing material for a concrete structure, characterized in that the triangular frame is combined upside down.
Further, the invention according to claim 4 is an opening reinforcing material for a concrete structure in which the reinforcing material is formed in a closed shape, and an axial direction reinforcing material arranged in the axial direction of the concrete structure and an intersecting direction of the axial direction reinforcing material. A pair of oblique reinforcing members disposed in the two, and each of the reinforcing members has two triangular frames having a closed shape with continuity, and the projected triangular shape is formed on the top of the triangular frame. It is a hole reinforcing material for a concrete structure, wherein two triangular frame bodies are formed vertically so that the frame body is positioned.
Further, the invention according to claim 5 is the hole reinforcing material for a concrete structure according to any one of claims 2 to 4, wherein the upper and lower triangular frame bodies have the same shape and the same size. is there.
Further, the invention according to claim 6 is the hole reinforcement for a concrete structure according to any one of claims 2 to 4, wherein the upper and lower triangular frame bodies have the same shape and a combination of different dimensions. It is a material.
Further, the invention according to claim 7 is the hole reinforcement of a concrete structure according to any one of claims 2 to 4, wherein the upper and lower triangular frame bodies are different shapes and combinations of different dimensions. It is a material.
The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein one diagonal reinforcing member is perpendicular to a fracture line of the concrete structure, and the other diagonal reinforcing member is the fracture line. It is a hole reinforcing material for a concrete structure, characterized by being positioned in parallel.
Further, the invention according to claim 9 is an aperture reinforcing material for a concrete structure according to any one of claims 1 to 8, wherein aperture reinforcing materials having different diameters or thicknesses are combined. is there.
Furthermore, the invention according to claim 10 is the reinforcing structure of the opening portion of the concrete structure in which the reinforcing material in which the reinforcing material is formed in a closed shape is disposed around the opening portion and reinforced,
Open-hole reinforcements with closed shapes that differ in dimensions are used, with an axial reinforcement member arranged in the axial direction of the concrete structure and a pair of diagonal reinforcement members arranged in the cross direction of the axial reinforcement member. The reinforcing structure of the opening portion of the concrete structure is characterized in that an opening reinforcing material that differs only in dimensions according to the degree of reinforcement is arranged around the opening portion to be made.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiment 1 of the present invention will be described below with reference to the drawings.
[0008]
<A> Assumed layout structure (Figs. 1 and 4)
FIG. 1 is a perspective view of the vicinity of an opening portion of an SRC structural beam in which a main iron reinforcing member 2 is arranged around a main bone 1 such as H steel and a band 3 is arranged around the main iron reinforcing member 2. FIG. 2 shows a longitudinal sectional view of the beam 4 after placing the concrete. A sleeve 4 is inserted through the center of the beam 5 serving as an opening opening position, and the opening reinforcing members 6a and 6b according to the present invention are attached to one side or both sides of the sleeve 5.
[0009]
<B> Opening reinforcement (Fig. 2)
The respective aperture reinforcement members 6 a and 6 b that reinforce the periphery of the aperture portion are arranged in the cross direction of the axial reinforcement member 7 arranged in the axial direction (longitudinal direction) of the beam 5 and the axial reinforcement member 7. It comprises a pair of diagonal reinforcements 8 and 9 and is composed of a closed triangular frame with continuity at the ends of these reinforcements 7 to 9, for example, deformed reinforcing bars with irregularities on the surface, The surface is made of the same shape and dimensions with a wire rod such as a flat steel bar. Further, each of the hole reinforcing members 6a and 6b is not limited to be formed by a single wire, but may be formed by joining both ends of the three independent wires or near both ends, or an iron plate Alternatively, it may be manufactured by pressing or cutting a plastic plate, or a bundle of carbon fibers or plastic fibers.
Up to now, the breaking line of the opening was assumed to be 45 ° passing through the center of the opening as shown by reference numeral 10 in FIG. 2, but in reality, in the tangential direction of the opening as shown by hatching. It was clarified by various experiments that the fracture occurred in the regions 11 and 11 surrounded by the fracture line of 45 ° to 60 °.
In view of the current state of such destruction, one of the diagonal reinforcement members 8 and 9 is arranged so as to be substantially parallel to the fracture line of the beam 5 and to cross the upper and lower regions of the opening portion diagonally. It is important that the other of the oblique reinforcing members 8 and 9 is arranged perpendicular to the fracture line and has a sufficient fixing length with the concrete. The reason why the reinforcing seats 6a and 6b are formed in this manner is to improve the buckling resistance performance, the yield strength performance and the toughness performance as will be described later.
[0010]
<C> Opening Reinforcement Installation Form Before describing the installation forms of the opening reinforcement members 6a and 6b, the orientations of the opening reinforcement members 6a and 6b are defined. The form in which the merging part is located above the opening part is expressed as “upward”, and the form in which the merging part is located below the opening part is expressed as “downward”.
In FIG. 2, the hole reinforcing members 6a and 6b are arranged in the vertical direction.
That is, one of the hole reinforcing members 6a is disposed so that the axial reinforcing member 7 is located on the lower side of the hole portion, and the other hole reinforcing member 6b is opened. It is arranged in the direction located on the upper side of the part. Each hole reinforcing material 6a, 6b is attached to the band 3 by binding or welding. In addition, as for the installation form of the hole reinforcing materials 6a and 6b, one obtained by previously integrating the two hole reinforcing materials 6a and 6b by welding or the like, or installing each hole reinforcing material 6a, 6b, 6b may be formed as a single unit and installed individually.
[0011]
[Action]
Next, the reinforcing mechanism of the hole reinforcing material will be described.
[0012]
[Assumption]
As shown in FIG. 3, when a deformation force acts on the beam 5, stress concentrates so that cracks are generated in the areas 11 and 11 indicated by hatching.
[0013]
[About yield strength]
However, as shown in FIG. 3, tensile forces T1 and T2 are generated in the beam 5 along the arrangement direction of the oblique reinforcing members 8 and 8, as indicated by arrows. Therefore, the diagonal reinforcements 8, 8 oppose the tensile forces T1, T2.
That is, of the hole reinforcing members 6a and 6b, the portions of the oblique reinforcing members 8 and 8 that are orthogonal to the regions 11 and 11 and have sufficient fixing force function as reinforcing members that improve the proof stress.
[0014]
[About buckling]
Of the hole reinforcing members 6a and 6b, the portions of the oblique reinforcing members 9 and 9 along the regions 11 and 11 function as a resistance material for preventing buckling. Here, in order to facilitate understanding of the reinforcing mechanism of the hole reinforcing members 6a and 6b, the diagonal reinforcing members 8 and 9 are described separately. However, each of the diagonal reinforcing members 8 and 9 has a function of improving the yield strength and the seat. Both have a bending resistance function.
[0015]
[About toughness]
Moreover, as shown in FIG. 5, the part of each axial direction reinforcing material 7 and 7 located in the axial direction of the beam 5 functions as a reinforcing member which improves toughness among the opening reinforcing materials 6a and 6b.
[0016]
[Reinforcement synergy]
In addition to the functions described above, the opening reinforcing members 6a and 6b are formed with hexagonal reinforcing frames around the opening portions, and the reinforcing frames distribute the force. In addition, since the binding force of the concrete increases, a synergistic reinforcing effect is obtained in combination with the reinforcing effect described above.
[0017]
Second Embodiment of the Invention
In the first embodiment, the case where each of the hole reinforcing members 6a and 6b is formed of a single triangular frame has been described.
[0018]
FIG. 6 shows another embodiment in which each of the upward and downward opening reinforcing members 6c and 6d and the opening reinforcing members 6e and 6d are each constituted by a plurality of triangular frame bodies.
In the description of each embodiment described below, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0019]
In the case of the present embodiment, the opening reinforcing members 6c, 6d and the opening reinforcing members 6e, 6d arranged on each side are of the same shape and the same size, and the oblique reinforcing members 8, 8 and 9, 9 Also, the axial reinforcements 7, 7 are superposed on each side, and the oblique reinforcements 8, 8, 9, 9 are displaced on each side in the axial direction so that they do not overlap. In other words, the axial reinforcing members 7 and 7 of the opening reinforcing members 6c and 6d and 6e and 6d made of a triangular frame are parallel to the axial direction of the beam 5, and the oblique reinforcing members 8 and 9 are The top and bottom are combined upside down so that they intersect.
[0020]
In the present embodiment, the structural performance (proof strength, buckling, toughness performance, shear resistance performance, etc.) is doubled as compared with the first embodiment.
Further, as the manufacturing form of the hole reinforcing materials 6c to 6f, (1) each of the hole reinforcing materials 6c to 6f is formed as a single unit, or (2) the unit of the upward hole reinforcing materials 6c and 6d. These are formed integrally with each of the downward opening reinforcing members 6e and 6f, or (3) integrally formed with the upward and downward opening reinforcing members 6c and 6e and the opening reinforcing members 6d and 6f as one unit. Or {circle over (4)} four manufacturing forms in which all the hole reinforcing members 6c to 6f are integrally formed are conceivable.
[0021]
In addition, as a method of integrally forming a plurality of hole reinforcing materials, a single hole reinforcing material is polymerized and integrated by welding the intersections, and a single wire is bent. It is possible to use a method in which a plurality of aperture reinforcing materials are formed into a polymerized shape, and both ends of the wire are joined and processed.
[0022]
Embodiment 3 of the Invention
The case where the opening portion is formed at the center of the concrete structure (beam 5) has been described above. FIGS. 7 and 8 show other cases where the hole forming position is eccentric with respect to the concrete structure (beam 5) in either the upper or lower direction by using an opening reinforcing material having different dimensions. An embodiment of the present invention will be described.
[0023]
FIG. 7 shows a case where the upward opening reinforcing material 6a and the downward opening reinforcing material 6b are arranged one by one. The relatively small shape of the downward opening reinforcing material 6b is disposed in the lower half of the beam 5 having a thin frame thickness from the opening to the surface of the beam 8, and the upward opening reinforcing material 6a having a relatively large shape. Is arranged in the upper half of the beam 5 having a thick frame from the opening to the surface of the beam 8.
[0024]
FIG. 8 shows a case where the number of the opening reinforcing members 6c to 6f facing upward and downward in FIG. 7 is plural.
[0025]
Embodiment 4 of the Invention
Each of the hole reinforcing members 6a and 6b or the hole reinforcing members 6c to 6f described above has been described with respect to the case where they are installed in a combination of upward and downward, but there may be cases where only upward or only downward is provided.
[0026]
Embodiment 5 of the Invention
FIG. 9 shows another embodiment in which the deformed hole reinforcing materials 6g and 6h, which are in contact with the vertices of two triangular frames, are arranged vertically. In the present embodiment, the projection-shaped triangular frame is integrally formed on the tops of the aperture reinforcing members 6a and 6b of the first embodiment described above. , 9 and 9 are formed on the same line, and the axial reinforcing members 7 and 7 are formed in parallel with the axial direction.
The differences from the first embodiment are that the overall length of the diagonal reinforcing members 8 and 9 can be secured long, and the axial reinforcing member 7 can be disposed near the surface of the concrete structure (beam 5), so that the toughness performance is further improved. It is a point to improve.
[0027]
Embodiment 6 of the Invention
FIG. 10 shows another embodiment in which only one of the deformed hole reinforcing materials 6g and 6h of the fifth embodiment is arranged and reinforced.
In this embodiment, it is possible to cope with the case where the opening is eccentric.
[0028]
Embodiment 7 of the Invention
FIG. 11 to FIG. 13 show other embodiments in which a plurality of irregular and different size hole reinforcing materials are combined.
FIG. 11 shows an example in which two reinforcing reinforcing members 6a and 6b having two triangular shapes (an isosceles triangle and an equilateral triangle) having different lengths and angles are installed in opposite directions, and FIG. FIG. 13 shows an example in which a modified aperture reinforcing material 6g and a triangular aperture reinforcing material 6b are installed in combination.
Moreover, when combining a plurality of aperture reinforcing materials, a combination of different shapes and the same dimensions (same contour length) is possible.
In this embodiment, it is more effective when the opening portion is eccentric to any one of the lower and lower sides.
[0029]
Embodiment 8 of the Invention
The hole reinforcing materials 6a to 6h described in the above first to sixth embodiments may be used in combination so as to overlap with a known hole reinforcing material (for example, the hole reinforcing material shown in FIG. 14). .
Since each hole reinforcing material 6a-6h of this invention is excellent in toughness performance, it is useful for the toughness improvement of the conventional hole reinforcing material.
[0030]
Ninth Embodiment
The above has described the case where each aperture reinforcing material 6a to 6h is produced using a material having a uniform diameter (uniform thickness). However, each aperture reinforcing material 6a to 6h is a material constituting the reinforcing material in each direction. Of course, combinations having different diameters (thicknesses) may be used.
[0031]
【The invention's effect】
Since the present invention is as described above, the following effects can be obtained.
<A> The aperture reinforcing material includes an axial reinforcing material arranged in the axial direction (longitudinal direction) of the concrete structure and a pair of oblique reinforcing materials arranged in the crossing direction of the axial reinforcing material. By forming these reinforcements in a closed shape with continuity, both the yield strength and toughness performance, which have been difficult to achieve, can be improved at the same time.
In particular, since the shape of the hole reinforcing material is simple, the mechanical resistance mechanism is simple, and the reliability of the reinforcing effect is increased.
<B> So far, it has been a basic function required for the aperture reinforcing material to uniformly reinforce the periphery of the aperture portion. It has been constructed in the same way when the opening is eccentric. On the other hand, according to the present invention, by appropriately using different hole reinforcing materials having different dimensions, it is possible to perform appropriate reinforcement according to the degree of reinforcement above and below the eccentric opening portion, thereby realizing economical and efficient reinforcement. .
<C> Since one oblique direction reinforcing material constituting the hole reinforcing material is orthogonal to the fracture line and can sufficiently secure the adhesion length with the concrete, high yield strength performance can be obtained.
<D> Since the other diagonal reinforcing material constituting the hole reinforcing material is located parallel to the fracture line and crosses the upper and lower portions of the hole part diagonally, it effectively prevents buckling in this region. To do. Furthermore, the axial reinforcing material that is arranged in the axial direction above and below the opening portion and sufficiently secures the adhesion length with the concrete also functions to improve the toughness performance. Therefore, the toughness performance at the time of large deformation and the toughness performance after shear fracture of the aperture are significantly improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of the vicinity of an opening portion of an SRC structural beam in which an opening reinforcing material according to the present invention is arranged. FIG. 2 is a longitudinal sectional view of the beam after placing concrete. FIG. 4 is a model diagram for explaining the function of one oblique reinforcing member. FIG. 4 is a model diagram for explaining the function of the other oblique reinforcing member constituting the hole reinforcing member. FIG. 5 is an axial reinforcing member constituting the opening reinforcing member. Fig. 6 is a model diagram for explaining the function of a material. Fig. 6 is a longitudinal sectional view of a beam provided with an aperture reinforcing material according to another embodiment. Fig. 7 is an aperture according to another embodiment for reinforcing an eccentric aperture. Vertical cross-sectional view of a beam provided with a hole reinforcing material [Fig. 8] Vertical cross-sectional view of a beam provided with a hole reinforcing material according to another embodiment for reinforcing an eccentric opening portion [Fig. 9] FIG. 10 is a longitudinal sectional view of a beam in which an aperture reinforcing material according to another embodiment is arranged. FIG. 10 is a longitudinal sectional view of a beam in which an aperture reinforcing material according to another embodiment is arranged. FIG. 11 is a longitudinal sectional view of a beam according to another embodiment in which a plurality of irregular and different size hole reinforcing materials are combined. FIG. 12 is another embodiment in which a plurality of irregular and different size hole reinforcing materials are combined. FIG. 13 is a longitudinal cross-sectional view of a beam according to another embodiment in which a plurality of deformed and different-sized aperture reinforcements are combined. Plan view related to hole reinforcement

Claims (6)

In the opening reinforcement material for concrete structures in which the reinforcement material is formed in a closed shape,
An axial reinforcement disposed in the axial direction of the concrete structure;
A pair of diagonal reinforcements arranged in the cross direction of the axial reinforcement,
Each of these reinforcing materials consists of a plurality of triangular frames that have a closed shape with continuity,
Characterized in that the axial reinforcing material of the triangular frame body is polymerized and each diagonal reinforcing material is shifted in the axial direction.
Opening reinforcement for concrete structures. Oite to claim 1, wherein the axial reinforcement of the triangular frame is a parallel to the axial direction of the concrete structure, such that each oblique stiffener intersect, upside down the single said triangular frame A hole reinforcing material for a concrete structure, characterized by being integrally formed in combination. Oite to claim 2, wherein the upper and lower triangular frame is isomorphic a and the same dimensions, openings reinforcement of concrete structures. Oite to claim 2, wherein the upper and lower triangular frame is a combination of and different dimensions in the same shape, the opening reinforcement of concrete structures. Oite to claim 2, wherein the upper and lower triangular frame is a combination of and different dimensions in profile, opening reinforcement of concrete structures. In the reinforcing structure of the opening portion of the concrete structure in which the reinforcing material formed in a closed shape is disposed around the opening portion and reinforced,
Using the closed hole reinforcing material according to any one of claims 1 to 5,
The apertures are formed so that one diagonal reinforcement of the triangular frame constituting the aperture reinforcement is perpendicular to the fracture line of the concrete structure and the other diagonal reinforcement is parallel to the fracture line. It is characterized by arranging the reinforcing material around the eccentric opening part,
Reinforcement structure for the opening of concrete structures.

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