JP5719084B2 - Reinforcement assemblies and shear reinforcements used in reinforced concrete structures - Google Patents

Description

  The present invention relates to a reinforcing bar assembly and a shear reinforcing bar used for a reinforced concrete structure such as a column, a beam, a wall, a ceiling, a floor, and a foundation.

  The reinforced concrete structure is constituted by embedding a reinforcing bar assembly in concrete. A long reinforced concrete structure such as a column or a beam will be described in detail as an example. As disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 8-42064), a reinforcing bar assembly is arranged with a plurality of main bars extending parallel to each other in a straight line and spaced apart in the longitudinal direction of these main bars. And an annular or spiral shear reinforcement bar arranged so as to surround these main bars. The concrete surface surrounds this rebar assembly all around.

  The reinforcing bars used for the main reinforcing bars and the shear reinforcing bars of the reinforcing bar assembly are formed by forming ribs for enhancing the adhesion performance with concrete on the outer periphery of the base part having a substantially circular cross section.

In the reinforced concrete structure, it is strictly required by the building standards that the concrete cover thickness is not less than a specified value. This cover thickness corresponds to the distance between the concrete surface and the part closest to the concrete surface in the reinforcing bar assembly.
Taking a long concrete structure such as a column or a beam as an example, the shear reinforcement bars are arranged on the outermost side of the reinforcing bar assembly, and the distance between the outer periphery of the shear reinforcement bars and the concrete surface is as follows. It becomes the cover thickness of concrete.

As mentioned above, it is strictly required to secure a cover thickness that exceeds the specified value, so the cross-sectional area of the concrete is reduced or the main bar is shifted outward (in the direction away from the central axis of the reinforced concrete structure). There is a limitation in increasing the strength of the reinforced concrete structure.
The only way to reduce the cross-sectional area of the concrete and to shift the main bar outward is to reduce the diameter of the shear reinforcement bar while ensuring a cover thickness that exceeds the specified limit. This leads to a decrease in the cross-sectional area of the muscle, and the original role of the shear reinforcement cannot be played. Further, when the arrangement pitch of the shear reinforcement bars is shortened and the number of shear reinforcement bars is increased in order to compensate for the reduction in the cross-sectional area of the shear reinforcement bars, the concrete filling defect and the number of parts are increased.

  The above issues are related to long reinforced concrete structures such as columns and beams. Reinforced concrete structures in which the diameter of the reinforcing bars affects the cover thickness of the concrete, such as walls extending on a plane, ceiling slabs, floor slabs And the basics have similar issues.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-104884) discloses a reinforcing bar in which the cross-sectional shape is flattened and the perimeter of the cross-sectional shape is increased in order to improve the adhesion performance to concrete. This rebar is used in reinforced concrete structures, but it is not clearly disclosed how to use it.

The present invention has been made to solve the above-described problems. In a reinforcing bar assembly used for a reinforced concrete structure and embedded in concrete, the reinforcing bar assembly includes a reinforcing bar having a flat cross-sectional shape. The cross-section reinforcing bars extend along the surface of the concrete, and are arranged so that the minor axis direction of the cross-sectional shape is orthogonal to the surface of the concrete.
According to the above configuration, the reinforcing bar has a flat cross-sectional shape, and the minor axis direction of the cross-sectional shape is orthogonal to the concrete surface. Therefore, the reinforcing bar dimensions in the direction orthogonal to the concrete surface while ensuring a sufficient cross-sectional area of the reinforcing bar Can be reduced. As a result, the reinforcement bar arrangement that can reduce the dimension in the direction perpendicular to the concrete surface in the cross-sectional shape of the concrete while ensuring sufficient concrete cover thickness, or improve the overall strength of the reinforced concrete structure A structure can be adopted.

One aspect of the present invention is a reinforcing bar assembly used for the reinforced concrete structure that extends linearly, and a plurality of main bars that extend parallel to each other and linearly extend in the longitudinal direction of the reinforced concrete structure. An annular or spiral shear reinforcement bar arranged at intervals in the longitudinal direction and surrounding the main bars, the shear reinforcement bar being arranged on the outermost side of the reinforcing bar assembly, It consists of a rebar with a flat cross-sectional shape, and is bent so that a pair of surfaces facing the minor axis direction are inside and outside.
According to the above configuration, it is possible to increase the overall strength by reducing the concrete cross-sectional area or shifting the main bars outward while sufficiently securing the concrete cover thickness. Moreover, it is easy to bend the shear reinforcement.

In another aspect of the present invention, a rebar assembly used for the reinforced concrete structure extending linearly, wherein the main bars are parallel to each other and extend linearly in the longitudinal direction of the reinforced concrete structure. And an annular or spiral shear reinforcing bar arranged so as to surround the main bars, and further connecting the main bars arranged in a straight line. And a pair of shear reinforcement bars arranged so as to surround the joint, and at least the additional shear reinforcement bars are composed of reinforcing bars having a flat cross-sectional shape and facing a short axis direction thereof. Is bent to be inside and outside.
In the above configuration, the additional shear reinforcement surrounding the joint approaches the concrete surface by the thickness of the joint, but the shear reinforcement consists of a reinforcing steel bar with a flat cross-sectional shape, and the short axis direction of the cross-sectional shape is the concrete surface. Therefore, the concrete cover thickness can be secured without reducing the cross-sectional area of the additional shear reinforcement.

According to still another aspect of the present invention, a reinforcing bar assembly is used for a reinforced concrete structure having a pair of flat concrete surfaces that spread in a plane and are parallel to each other, and disposed on a plane parallel to the pair of concrete surfaces. A plurality of first bars and a plurality of second bars orthogonal to each other, wherein at least one of the first bars and the second bars is composed of a rebar having a flat cross-sectional shape, and its short axis direction. Is orthogonal to the concrete surface.
According to the said structure, the thickness between concrete surfaces can be reduced, ensuring a concrete cover thickness.

In still another aspect of the present invention, the present invention is used for a reinforced concrete structure having a pair of flat concrete surfaces that are spread in a plane and parallel to each other and an opening penetrating between the concrete surfaces, and is parallel to the pair of concrete surfaces. A rebar assembly arranged on a plane, comprising a plurality of first bars and a plurality of second bars orthogonal to each other, and inclined with respect to the first and second bars so as to surround the opening. A plurality of slant bars arranged at the top, wherein at least the slant lines are made of the reinforcing bar having the flat cross-sectional shape, and the minor axis direction thereof is orthogonal to the concrete surface.
According to the above configuration, it is necessary to increase the thickness between the concrete surfaces by the amount of the diagonal stripes in order to secure the concrete cover thickness, but by using a reinforcing bar with a flat cross-sectional shape as the diagonal stripes. This increase in thickness can be suppressed.

Furthermore, the present invention is a shear reinforcing bar which is spanned between a plurality of main bars extending in a straight line parallel to each other or arranged so as to surround these main bars, and is composed of a reinforcing bar having a flat cross-sectional shape, and its cross-sectional shape The pair of surfaces facing the minor axis direction are bent so as to be inside and outside.
According to the said structure, a bending process of a shear reinforcement can be performed easily.

The shear reinforcing bar preferably has a base and a rib formed on the outer periphery of the base, and the outline of the cross-sectional shape of the base has a pair of straight portions facing the minor axis direction.
According to this configuration, the shear reinforcement can be bent on one plane without distortion.

More preferably, the ribs extend in the longitudinal direction of the shear reinforcement and have a pair of longitudinal ribs facing the major axis direction of the flat cross-sectional shape, and a lateral surface formed between the longitudinal ribs and extending in a direction intersecting the longitudinal ribs. Includes ribs.
According to this, the vertical rib can be bent more satisfactorily without hindrance.

  According to the present invention, the concrete cover thickness in the reinforced concrete structure can be sufficiently secured.

FIG. 1A is a cross-sectional view showing a rebar having a flat cross-sectional shape used in all the embodiments. FIG. 1B is a side view of the same reinforcing bar. FIG. 1C is a plan view of the same reinforcing bar. FIG. 2 is a longitudinal sectional view of a reinforced concrete column that constitutes the first embodiment of the present invention, and the reinforcing bar having the flat cross-sectional shape is used as a hoop. FIG. 3 is a cross-sectional view of the column. 4A is an enlarged cross-sectional view of a main part of FIG. 4B is an enlarged cross-sectional view of a main part of FIG. FIG. 5 is a cross-sectional view of a reinforced concrete column according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view of a reinforced concrete column that constitutes a third embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a reinforced concrete beam forming a fourth embodiment of the present invention. FIG. 8 is an enlarged cross-sectional view taken along line AA in FIG. FIG. 9 is a longitudinal sectional view of a reinforced concrete wall that constitutes a fifth embodiment of the present invention. FIG. 10: is a front view which abbreviate | omits concrete and shows the reinforced concrete wall which makes 6th Embodiment of this invention. FIG. 11 is a longitudinal sectional view of the wall of the sixth embodiment. FIG. 12 is a sectional view of a reinforced concrete cloth foundation according to a seventh embodiment of the present invention. FIG. 13 is a cross-sectional view of a reinforced concrete solid foundation according to an eighth embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. 1A-1C show a reinforcing bar 10 used in all embodiments. The rebar 10 is formed by rolling in the same manner as a normal deformed rebar, and includes a base 11, a pair of vertical ribs 12 formed on the outer periphery of the base 11 and continuously extending in the longitudinal direction of the rebar 10, and the outer periphery of the base 11. And the horizontal ribs 13 formed at equal intervals in the longitudinal direction of the reinforcing bar 10. The lateral rib 13 extends between the pair of longitudinal ribs 12 in the longitudinal direction of the reinforcing bar 10 and the direction intersecting the longitudinal rib 12 (a direction orthogonal or obliquely intersecting as shown).

  Unlike the ordinary deformed reinforcing bar, the reinforcing bar 10 has a flat cross-sectional shape. In this cross-sectional shape, the short axis is indicated by X and the long axis is indicated by Y. In the cross-sectional shape of the reinforcing bar 10, the ratio of the dimension Lx in the minor axis X direction to the dimension Ly in the major axis Y direction is 1.0: 1.2 to 1.0: 3.0, more preferably 1. 0: 1.5 to 1.0: 2.5. In this embodiment, it is about 1: 2. In FIG. 1A to FIG. 1C, the ratio is slightly exaggerated.

In this embodiment, the reinforcing bar 10 has an oval cross-sectional shape. More specifically, the base 11 has an oblong shape having a pair of flat surfaces 11a parallel to each other and a pair of arc surfaces 11b connecting the flat surfaces 11a. The pair of flat surfaces 11a face the short axis X direction, and the pair of arcuate surfaces 11b face the long axis Y direction.
The pair of flat surfaces 11 a provide a pair of straight portions in the outline of the cross-sectional shape of the base 11.

The pair of vertical ribs 12 are respectively formed in the center of the pair of arcuate surfaces 11b of the base 11, and are separated in the Y-axis direction.
The lateral rib 13 has a straight portion having a uniform height extending along the flat surface 11a of the base portion 11, and a curved portion extending along the circular arc surface 11b and continuing to the straight portion, and ends of the curved portion. Is connected to the vertical rib 12.

  Next, various embodiments of a reinforcing bar assembly including the reinforcing bar 10 and a reinforced concrete structure incorporating the reinforcing bar assembly will be described. In these embodiments, the reinforcing bars using the reinforcing bars 10 are represented by adding an uppercase alphabet to the numeral 10.

  2 to 4 show a reinforced concrete column 21 (linearly extending reinforced concrete structure) as a first embodiment of the present invention. The column 21 includes a concrete 22 having a quadrangular section and a hook-like reinforcing bar assembly 23 that is embedded in the concrete 22 and extends linearly. As is well known, this column 21 is obtained by placing concrete 22 in a space in a square-shaped mold (not shown) surrounding the reinforcing bar assembly 23 at a factory or a construction site.

The reinforcing bar assembly 23 is arranged at four corners of the rectangular planar shape of the reinforcing bar assembly 23 and is parallel to each other, and is substantially equidistant along the longitudinal direction of the main reinforcing bars 24. It has a large number of hoop bars 10A (shear reinforcement bars) arranged.
The main reinforcing bar 24 may be a normal deformed reinforcing bar having vertical ribs and horizontal ribs, or may be a reinforcing bar having screw nodes (screw reinforcing bar).

  The hoop bar 10A is called, for example, a welded closed hoop bar, and the straight reinforcing bar 10 having a flat cross-sectional shape shown in FIGS. 1A to 1C is bent into a square planar shape, and both ends thereof are welded. Can be obtained. In FIG. 3, the welded portion is indicated by reference numeral 10a, and the bent corner is indicated by reference numeral 10b. The hoop muscle 10A is disposed horizontally (arranged so as to intersect the main muscle 24 at a right angle). The four corners 10b of the hoop muscle 10A are stretched around the outside of the hoop muscle 10A while contacting the main muscle 24. As a result, the hoop bar 10 </ b> A surrounds the four main bars 24 and is located on the outermost side of the reinforcing bar assembly 3. The hoop muscle 10A and the main muscle 24 are connected by a thin metal wire (not shown).

  The concrete 22 has a cross-sectional shape that is a quadrangle that is similar to the planar shape of the reinforcing bar assembly 23, and has four flat concrete surfaces 22a parallel to each side of the hoop bar 10A. The distance between the outer side surfaces of the four sides of the hoop bar 10A and the concrete surface 22a is the cover thickness T of the concrete 22.

  As shown in FIGS. 4A and 4B, when forming the hoop bar 10A, the reinforcing bar 10 is bent so that a pair of flat surfaces 11a, 11a facing the short axis X direction are on the inner side and the outer side. A corner 10b is formed. Since the thickness in the bending direction is reduced in this way, the load required for this bending can be small, it is easy to process, and the radius of curvature can be reduced. In particular, in the present embodiment, the pair of surfaces 11a and 11a facing each other in the short axis X direction are flat (since having a straight line portion facing the short axis X direction in the contour line of the cross-sectional shape), the reinforcing bar 10 is bent without distortion, and a hoop line 10A arranged on a single plane can be obtained.

  As described above, the rebar 10 is bent so that the pair of surfaces 11a, 11a facing each other in the short axis X direction are on the outside and the inside, so that the short axis X direction of the cross-sectional shape of each side of the hoop bar 10A is concrete. It will be orthogonal to the surface 22a. As a result, the dimension Lx of the hoop bar 10A in the direction orthogonal to the concrete surface 22a can be reduced as compared with the conventional case where the reinforcing bar having the same cross-sectional area having a substantially circular cross section is used. The cover thickness T of the concrete can be increased.

  From another viewpoint, it is possible to reduce the cross-sectional area of the concrete 22 in accordance with the reduction in the dimension of the hoop bar 10A while securing the specified cover thickness.

  From another point of view, the position of the main muscle 24 can be arranged in the outward direction (the direction away from the center of the column 21), and the strength of the column 21 can be increased. This point will be described with reference to FIG. 4B. When a hoop bar 100 (represented by an imaginary line in the figure) made of a rebar having a circular cross section as in the prior art is used, the dimension in the direction orthogonal to the concrete surface 22a is large, and the radius of curvature of the corner 100b is also large. The position of the main muscle 104 for securing the length T is a position indicated by a virtual line. On the other hand, when the reinforcing bar 10 having a flat cross section is used as the hoop bar 10A as in the present invention, the dimension in the direction orthogonal to the concrete surface 22a is small, and the radius of curvature of the corner 10b is also small. When the cross-sectional area of the concrete 22 and the cover thickness T are the same, the main reinforcing bars 24 can be arranged outward from the conventional one.

  From another point of view, when the hoop bar 100 made of a reinforcing bar having a circular cross section is used as in the prior art, the cross-sectional area of the concrete 22 is reduced while the concrete cover thickness is secured, or the main bar 104 is moved outward. In order to shift to hoop muscle 100, it is necessary to reduce the diameter of hoop muscle 100, and the cross-sectional area of hoop muscle 100 is reduced. In order to compensate for the reduction in the cross-sectional area of the hoop reinforcement 100, it is necessary to increase the number of hoop reinforcements 100 and shorten the bar arrangement pitch. On the other hand, in the present invention, when the cross-sectional area of the concrete 22 is reduced or the main bar 24 is shifted outward, the concrete cover thickness can be secured without reducing the cross-sectional area of the hoop bar 10A. As a result, it is not necessary to shorten the bar arrangement pitch of the hoop bars 10A, and the filling property of the concrete is not impaired.

Hereinafter, other embodiments of the present invention will be described. In these embodiments, components corresponding to the preceding embodiments are assigned the same reference numerals and detailed description thereof is omitted.
In the column 21 of the second embodiment shown in FIG. 5, the hoop bars 10B are bent without welding both ends of the reinforcing bars 10 to form hook portions 10c (intersection portions), and these hook portions 10c are formed as one main bar 24. It is intended to be hung. The method of bending the hoop muscle 10B at the corner portion 10b and the hook portion 10c is the same as in the first embodiment, and the pair of surfaces 11a and 11a facing each other in the minor axis X direction are bent outward and inward.

  In the column 21 of the third embodiment shown in FIG. 6, in addition to the main bars 24 located at the corners of the rectangular planar shape of the reinforcing bar structure 23, the intermediate main bars 25 are also arranged on the sides of the planar shape. A shear reinforcing bar 10 </ b> C is stretched between the intermediate main bars 25. That is, a hook portion 10 d is formed at both ends of the shear reinforcing bar 10 C, and the hook portion 10 d is hung on the intermediate main bar 25. The shear reinforcing bar 10C is also composed of a rebar 10 having a flat cross-sectional shape, similar to the hoop bar 10A, and is bent so that the surface facing the minor axis X direction of the cross-sectional shape of the rebar 10 is on the outer side and the inner side. The hook portion 10d is formed. Therefore, the shear reinforcing bar 10C does not protrude outward from the hoop bar 10A, and the cover thickness of the concrete 22 is not reduced.

  In the fourth embodiment shown in FIGS. 7 and 8, the present invention is applied to a reinforced concrete beam 31 (reinforced concrete structure) extending linearly and horizontally. The beam 31 is configured by connecting reinforcing bar assemblies 33 having a basic structure similar to the reinforcing bar assembly 23 of the column 21 and embedding them in concrete 32 having a rectangular cross section. The connection of the reinforcing bar assembly 33 is obtained by inserting and connecting the ends of the two main reinforcing bars 34 arranged in a straight line to the joint 35. If the main reinforcing bar 34 is a threaded reinforcing bar, the joint 35 has a female screw on the inner periphery and connects the ends of the main reinforcing bar 34 by screwing.

A hoop bar 36 surrounding the main bar 34 has a circular cross section in the same manner as a normal reinforcing bar. In order to maintain the strength of the beam 31, it is necessary to hang a hoop bar 10D (additional shear reinforcement bar) also on the joint 35. Since the joint 35 has a diameter larger than that of the main bar 34, if a rebar having a substantially circular cross section is used as the hoop bar 10D like the hoop bar 36, the concrete cover thickness T between the hoop bar 10D and the concrete surface 32a is reduced. End up. Therefore, in the present embodiment, the reinforcing bar 10 having a flat cross section shown in FIG. 1 is used as the hoop bar 10D. The reinforcing bar 10 is bent so that the short axis X is orthogonal to the concrete surface 32a and the pair of surfaces 11a, 11a facing each other in the short axis X direction are on the outer side and the inner side, as in the preceding embodiment. As a result, a decrease in the cover thickness T can be avoided.
From another viewpoint, it is not necessary to reduce the cross-sectional area of the hoop bar 10D in order to secure the cover thickness T, and it is not necessary to increase the hoop bar 10D and reduce the bar arrangement pitch in order to compensate for the reduction in the cross-sectional area. Specifically, the hoop muscle 10 </ b> D can have the same pitch as the hoop muscle 36.
In the fourth embodiment, the hoop bar 36 may also be formed of the reinforcing bar 10 having a flat cross-sectional shape.

The column structure of the first to third embodiments can also be applied to a beam extending horizontally and linearly.
Also, the beam structure of the fourth embodiment can be applied to a column.

  In the fifth embodiment shown in FIG. 9, the present invention is applied to a reinforced concrete wall 41 (a reinforced concrete structure spreading in a plane). The wall 41 is configured by embedding two reinforcing bar assemblies 43 in the concrete 42. The concrete 42 has a vertical surface 42a that is parallel to each other, and the two rebar assemblies 43 are parallel to the concrete surface 42a and are spaced apart from each other in the thickness direction of the concrete 42, respectively. Has been placed.

  Each reinforcing bar assembly 43 is configured by connecting vertical bars 10E (first bars) and horizontal bars 10F (second bars) with thin metal wires at the intersections.

As the vertical bars 10E and the horizontal bars 10F, the reinforcing bars 10 having a flat cross section shown in FIG. 1 are used. The reinforcing bar 10 is used in a straight shape without being bent and cut into a predetermined dimension. The minor axis X direction of the cross-sectional shape of the reinforcing bar 10 is orthogonal to the concrete surface 42a.
Thereby, the thickness of the wall 42 can be reduced while ensuring the concrete cover thickness T and sufficiently securing the concrete filling space between the reinforcing bar assemblies 43. From another viewpoint, the concrete cover thickness T can be increased or the concrete filling space can be increased without changing the thickness of the wall 42.

In the sixth embodiment shown in FIGS. 10 and 11, the present invention is applied to a reinforced concrete wall 41 as in FIG. An opening 41a for allowing piping (not shown) or the like to pass through the wall 41 is formed, and the vertical reinforcement 10E and horizontal reinforcement 10F of the reinforcing bar assembly are removed in a region corresponding to the opening 41a. The opening 41a may be a window or door opening.
Surrounding this opening 41a, additional vertical stripes 10E 'on the left and right, additional horizontal stripes 10F' on the top and bottom, and four diagonal stripes 10G are arranged.

In this embodiment, not only the vertical reinforcement 10E and the horizontal reinforcement 10F but also the additional vertical reinforcement 10E ′, the horizontal reinforcement 10F ′, and the oblique reinforcement 10G are composed of the reinforcing bars 10 having a flat cross-sectional shape, and the minor axis X direction thereof is It is orthogonal to the concrete surface 42a .

  By incorporating the oblique bars 10G, the concrete cover thickness and the concrete filling space between the pair of reinforcing bar assemblies 43 are reduced. However, by using the reinforcing bars 10 having a flat cross-sectional shape, these reductions can be suppressed. .

  In the seventh embodiment shown in FIG. 12, the present invention is applied to a reinforced concrete cloth foundation 50 (a reinforced concrete structure). This fabric foundation 50 extends along the wall of the house and supports the house. The fabric foundation 50 has a foundation portion 50A buried in the ground GL and an upright portion 50B that stands upright from the foundation portion 50A. In the present application, the foundation portion 50A and the upright portion 50B are also regarded as reinforced concrete structures, respectively.

In the foundation 50A, the foundation-side reinforcing bar assembly 52 embedded in the concrete 51 having a rectangular cross section is arranged on a horizontal plane, and two horizontal bars 10 J (first bars) that are parallel to each other, and these horizontal bars 10 J. is stretched perpendicular to the horizontal muscle 10 J during has a plurality of horizontal muscle 10 H which are equally spaced (second muscle) along the horizontal muscle 10 J, a ladder shape There is no. These horizontal bars 10H and 10J are composed of reinforcing bars 10 having a flat cross section, and are arranged so that the short axis X of the cross section is directed in the vertical direction, that is, perpendicular to the upper and lower horizontal surfaces 51a and 51a of the concrete 51. ing.

  In the upright portion 50B, the upright portion side reinforcing bar assemblies 54 embedded in the concrete 53 having a rectangular cross section are arranged on a vertical surface (that is, on a plane parallel to the left and right vertical surfaces 53a and 53a of the concrete 53). Two horizontal muscles 10K (first muscles) that are parallel to each other, and a large number of vertical muscles 10L (second muscles) that are spanned between these horizontal muscles 10K and arranged at equal intervals along the horizontal muscle 10K. And has a ladder shape. The lower end of the upright part side reinforcing bar assembly 54 is fixed to the approximate center of the base side reinforcing bar assembly 52.

  The horizontal bars 10K and the vertical bars 10L are made of reinforcing bars 10 having a flat cross section, and the short axis X of the cross section extends in the thickness direction of the concrete 53, that is, perpendicular to the left and right vertical surfaces 53a, 53a of the concrete 53. So that it is oriented.

  In addition, the standing part side reinforcement assembly 54 of this embodiment has the intermediate horizontal reinforcement 10M arranged in parallel between the two horizontal reinforcements 10K. The cross-sectional area of the intermediate bar 10M is smaller than the horizontal bar 10K. Therefore, the rebar 10 with a flat cross section may be used like the vertical bars 10K as in this embodiment, or the cross section may be circular.

  In the eighth embodiment shown in FIG. 13, the present invention is applied to a solid foundation 60 (reinforced concrete structure) made of reinforced concrete. The solid foundation 50 includes a horizontal slab 60A, an outdoor side standing part 60B along the outer wall of the house, and an indoor side standing part 60C along the indoor wall of the house. In the present application, these horizontal slab 60A and upright portion 60B. 60C is also regarded as a reinforced concrete structure.

  The horizontal slab 60 </ b> A has a horizontally extending concrete 61 and a reinforcing bar assembly 62 embedded in the concrete 61 in parallel with the upper and lower flat surfaces 61 a and 61 a of the concrete 61. The reinforcing bar assembly 62 has a large number of horizontal bars 10P (first bars) parallel to each other and a large number of horizontal bars 10Q (second bars) perpendicular to the horizontal bars 10P, and has a net shape. . These first bars 10P and 10Q are composed of reinforcing bars 10 having a flat cross section, and are oriented so that the short axis X of the cross section extends vertically, that is, so as to be orthogonal to the upper and lower horizontal surfaces 61a and 61a of the concrete 61. ing.

  In the outdoor standing part 60 </ b> B, the reinforcing bar assembly 64 embedded in the concrete 63 having a rectangular cross section is disposed on a vertical plane parallel to the left and right flat vertical surfaces 63 a and 63 a of the concrete 63. A plurality of horizontal stripes 10R (first stripes) arranged in parallel, and a number of vertical stripes 10S (between the horizontal stripes 10R and at equal intervals along the horizontal stripes 10R) Second muscle). These horizontal bars 10R and vertical bars 10S are made of reinforcing bars 10 having a flat cross section, and the short axis X of the cross section extends in the thickness direction of the concrete 63, that is, perpendicular to the left and right vertical surfaces 63a, 63a of the concrete 63. So that it is oriented.

The vertical bars 10S are bent at the lower end located at the intersection of the horizontal slab 60A and the outdoor side upright portion 60B. That is, the pair of surfaces 11a, 11a facing each other in the short axis direction of the reinforcing bar 10 having a flat cross section are bent so as to be on the outer side and the inner side.

  The indoor upright portion 60 </ b> C is formed by concrete 65 having a rectangular cross section and a vertical reinforcing bar assembly 66 embedded in the concrete 65. Since this indoor side upright portion 60C has the same structure as the upright portion 50B shown in FIG. 12, the same reference numerals are assigned to the reinforcing bars used, and description thereof is omitted.

The present invention is not limited to the above embodiment, and various forms can be adopted. For example, the flat cross-sectional reinforcing bar may have a shape in which a screw reinforcing bar is crushed.
The flat cross-sectional reinforcing bar may have an elliptical cross-sectional shape.

  A hoop reinforcement (shear reinforcement) used for a reinforced concrete structure such as a column or a beam may be a spiral hoop reinforcement. In this case, each winding part is arrange | positioned at intervals in the longitudinal direction of a reinforced concrete structure.

The cross section of the reinforced concrete column may be polygonal or circular. In the case of a circle, the hoop is bent so that the planar shape is a circle.
In the embodiments of FIGS. 9 to 13, only one of the first muscle and the second muscle may be composed of a reinforcing bar having a flat cross-sectional shape.
In the embodiment of FIGS. 10 and 11, only diagonal bars may be constituted by reinforcing bars having a flat cross-sectional shape.
The structure of the reinforced concrete structure shown in FIGS. 9 to 11 may be applied to a ceiling slab or a floor slab.

  The present invention can be applied to reinforced concrete structures such as columns, beams, walls, ceilings, floors, and foundations.

Claims (5)

Reinforcing bar assembly used in a reinforced concrete structure having a pair of flat concrete surfaces that spread in a plane and parallel to each other and an opening penetrating between the concrete surfaces, and disposed on a plane parallel to the pair of concrete surfaces Because
A plurality of first muscles and a plurality of second muscles that are orthogonal to each other, and a plurality of oblique muscles that are inclined with respect to the first and second muscles and are arranged to surround the opening,
A reinforcing bar assembly characterized in that at least the oblique bars are made of reinforcing bars having a flat cross-sectional shape, and the minor axis direction thereof is orthogonal to the concrete surface. Reinforcement assembly used for linearly extending reinforced concrete structures and embedded in concrete,
A plurality of main bars that are parallel to each other and extend linearly in the longitudinal direction of the reinforced concrete structure, and are arranged along the concrete surface so as to surround the main bars and are spaced apart in the longitudinal direction of the main bars. An annular or spiral shear reinforcement,
Furthermore, a cylindrical joint that connects the main bars arranged in a straight line, and an additional shear reinforcement bar arranged along the concrete surface so as to surround the joint,
At least the additional shear reinforcement bar is composed of a rebar with a flat cross-sectional shape, bent so that a pair of surfaces facing the short axis direction are inside and outside, and the short axis direction of the flat cross-sectional shape is the concrete surface Rebar assembly characterized by being orthogonal to A reinforced concrete structure in which the reinforcing bar assembly according to claim 1 is embedded in the concrete. It has a base and a rib formed on the outer periphery of the base, the base has a flat cross-sectional shape, and the outline of the cross-sectional shape of the base has a pair of straight portions facing the minor axis direction ,
The rib includes a pair of vertical ribs extending in the longitudinal direction of the reinforcing bar and facing the long axis direction of the flat cross-sectional shape, and a horizontal rib formed between the vertical ribs and extending in a direction intersecting with the vertical ribs. Reinforcing bar. A shear reinforcement bar constituted by the reinforcing bars according to claim 4 , spanned between a plurality of main bars that extend linearly in parallel with each other, or arranged to surround these main bars,
A shear reinforcing bar characterized in that a pair of surfaces facing the minor axis direction of the cross-sectional shape are bent so as to be inside and outside.

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