WO2013150668A1

WO2013150668A1 - Reinforcement assembly and shear reinforcing bars used for reinforced concrete structure

Info

Publication number: WO2013150668A1
Application number: PCT/JP2012/072338
Authority: WO
Inventors: 越路　正人; 登森田; 利夫関口; 邦雄吉田; 佐藤　達也
Original assignee: 東京鐵鋼株式会社
Priority date: 2012-04-02
Filing date: 2012-09-03
Publication date: 2013-10-10
Also published as: SG11201404127QA; TW201344015A; KR20150002715A; JP5719084B2; JPWO2013150668A1; CN104204377A

Abstract

[Problem] To provide a reinforced concrete structure in which sufficient concrete cover thickness can be obtained. [Solution] A column, representing a reinforced concrete structure, is provided with concrete (22), and a reinforcement assembly embedded in the concrete (22). The reinforcement assembly has: a plurality of main reinforcements (24) extending in a straight line so as to be parallel to each other; and shear reinforcements (10A) arranged at intervals along the longitudinal direction of the main reinforcements (24) so as to enclose the main reinforcements (24). The shear reinforcements (10A) are arranged at the outermost position of the reinforcement assembly. The distance between the outer periphery of the shear reinforcements (10A) and the concrete surface (22a) represents the concrete cover thickness (T). Each of the shear reinforcements (10A) is made from a reinforcement bar having a flat cross-section, arranged so that the direction of the short axis X of the cross-section is orthogonal to the concrete surface (22a), and bent so that a pair of surfaces (11a, 11a) that face each other in the direction of the short axis (X) are positioned on the inside and the outside.

Description

Rebar assembly and shear reinforcement used for reinforced concrete structures

The present invention relates to a reinforcing bar assembly and a shear reinforcing bar used for reinforced concrete structures such as columns, beams, walls, ceilings, floors, foundations and the like.

A reinforced concrete structure is constructed by embedding a rebar 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), the reinforcing bar assembly is arranged with a plurality of main bars extending in parallel and linearly extending, and at intervals in the longitudinal direction of these main bars. And an annular or spiral shear reinforcing bar disposed so as to surround these main bars. The concrete surface encloses the rebar assembly all around.

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

In the above-described reinforced concrete structure, it is strictly required by building standards that the thickness of the concrete cover be equal to or more than a specified value. This cover thickness corresponds to the distance between the concrete surface and the part of the rebar assembly closest to the concrete surface.
For example, in the case of a long concrete structure such as a column or a beam, the shear reinforcing bars are disposed at the outermost side of the reinforcing bar assembly, and the distance between the outer periphery of the shear reinforcing bars and the concrete surface is It becomes cover thickness of concrete.

As described above, since it is strictly required to secure a cover thickness exceeding the specified value, the cross-sectional area of concrete is reduced, or the main bars are shifted outward (in a direction away from the central axis of the reinforced concrete structure). There are limitations in increasing the strength of reinforced concrete structures.
In order to achieve a reduction in the cross-sectional area of the concrete and an outward shift of the main bars while ensuring a cover thickness exceeding the specified thickness, the only way is to reduce the diameter of the shear reinforcement bars, but doing so results in shear reinforcement. This leads to a reduction in the cross-sectional area of the muscle and makes it impossible to play the original role of the shear reinforcement. In addition, if the arrangement pitch of 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 filling failure of concrete is caused and the number of parts is increased.

Although the above-mentioned subject relates to long reinforced concrete structures such as columns and beams, reinforced concrete structures in which the diameter of the reinforcing bar influences the thickness of the cover of the concrete, for example, wall, ceiling slab, floor slab extending in a plane And basics have similar issues.

Patent Document 2 (Japanese Patent Laid-Open No. 2006-104884) discloses a reinforcing bar in which the cross-sectional shape is flattened and the circumferential length 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 it is used.

The present invention has been made to solve the above problems, and in a rebar assembly used in a reinforced concrete structure and embedded in concrete, the rebar assembly includes a rebar having a flat cross-sectional shape, and the flat The cross-sectional reinforcing bar extends along the surface of the concrete, and is characterized in that the minor axis direction of the cross-sectional shape is disposed to be orthogonal to the surface of the concrete.
According to the above configuration, since the reinforcing bar has a flat cross-sectional shape, and the short axis direction of the cross-sectional shape is orthogonal to the concrete surface, the reinforcing bar dimension in the direction orthogonal to the concrete surface while sufficiently securing the cross-sectional area of the reinforcing bar Can be reduced. As a result, in the cross-sectional shape of the concrete, the dimension in the direction orthogonal to the concrete surface can be reduced while securing the concrete cover thickness sufficiently, and the reinforcement of the reinforcing bar assembly can improve the overall strength of the reinforced concrete structure. The structure can be adopted.

One aspect of the present invention is a rebar assembly for use in the above-described reinforced concrete structure extending linearly, comprising: a plurality of main bars extending in a straight line in the longitudinal direction of the reinforced concrete structure in parallel with each other; And an annular or helical shear reinforcement bar spaced longitudinally and surrounding the main bars, the shear reinforcement bars being disposed on the outermost side of the rebar assembly; It consists of a reinforcing bar with a flat cross-sectional shape, and is bent so that a pair of surfaces facing in the minor axis direction are inside and outside.
According to the above configuration, it is possible to reduce the cross-sectional area of the concrete or shift the main bars outward to increase the overall strength while sufficiently securing the thickness of the concrete cover. In addition, it is easy to bend the shear reinforcement bars.

Another aspect of the present invention is a rebar assembly for use in the above-described reinforced concrete structure extending linearly, comprising: a plurality of main bars extending in a straight line in the longitudinal direction of the reinforced concrete structure in parallel with each other; And an annular or spiral shear reinforcing bar arranged at intervals in the longitudinal direction of the frame and surrounding the main bars, and further, a cylindrical shape for connecting the main bars arranged in a straight line. And an additional shear reinforcing bar disposed to surround the joint, at least the additional shear reinforcing bar being made of the flat cross-sectional reinforcing bar, and a pair of faces facing in the minor axis direction Are bent to be inside and outside.
In the above configuration, the additional shear reinforcement bar surrounding the joint approaches the concrete surface by the thickness of the joint, but the shear reinforcement bar is made of rebar having a flat cross-sectional shape, and the short axis direction of the cross-sectional shape is the concrete surface And orthogonal to that, it is possible to secure a concrete cover thickness without reducing the cross-sectional area of this additional shear reinforcement.

In still another aspect of the present invention, a reinforcing bar assembly used in a reinforced concrete structure having a pair of flat concrete surfaces which extend in a plane and are parallel to each other, and which is disposed on a plane parallel to the pair of concrete surfaces. A plurality of first lines and a plurality of second lines orthogonal to each other, at least one of the first lines and the second lines being made of the reinforcing bar having the flat cross-sectional shape, and its short axis direction Is orthogonal to the concrete surface.
According to the above configuration, the thickness between the concrete surfaces can be reduced while securing the thickness of the concrete cover.

In still another aspect of the present invention, it is used in a reinforced concrete structure having a pair of flat concrete surfaces which extend in a plane and are parallel to each other and an opening penetrating between the concrete surfaces, and is parallel to the pair of concrete surfaces. A rebar assembly disposed on a plane, comprising: a plurality of first 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 And a plurality of diagonal bars arranged in at least the diagonal bars, and at least the diagonal bars are made of the reinforcing bar having the flat cross-sectional shape, and the minor axis direction 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 arranging the diagonal bars in order to secure the thickness of the concrete cover, but by using a reinforcing bar with a flat cross-sectional shape as the diagonal bars This thickness increase can be suppressed.

Furthermore, in the present invention, in a shear reinforcement bar which is placed between a plurality of parallel parallel, linearly extending main bars or arranged so as to surround these main bars, the reinforcing bars consist of reinforcing bars having a flat cross-sectional shape, and the cross-sectional shape It is characterized in that it is bent so that a pair of faces facing in the direction of the minor axis of the frame are inside and outside.
According to the above configuration, bending of the shear reinforcement bar can be easily performed.

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

More preferably, the ribs extend in the longitudinal direction of the shear reinforcing bars and a pair of longitudinal ribs facing the long axis direction of the flat cross-sectional shape, and a transverse extending between the longitudinal ribs and extending in a direction intersecting the longitudinal ribs Includes a rib.
According to this, it is possible to perform the bending process more satisfactorily without causing any trouble in the longitudinal rib.

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 of flat cross-sectional shape used in all embodiments. FIG. 1B is a side view of the same rebar. FIG. 1C is a plan view of the same rebar. FIG. 2 is a longitudinal cross-sectional view of the reinforced concrete column which constitutes the first embodiment of the present invention, and the reinforcing bar having the flat cross-sectional shape is used as a hoop bar. FIG. 3 is a cross-sectional view of the column. FIG. 4A is an enlarged cross-sectional view of the main part of FIG. FIG. 4B is an enlarged cross-sectional view of the main part of FIG. FIG. 5 is a cross-sectional view of a reinforced concrete column constituting a second embodiment of the present invention. FIG. 6 is a cross-sectional view of a reinforced concrete column constituting a third embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a reinforced concrete beam according to 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 according to a fifth embodiment of the present invention. FIG. 10 is a front view showing a reinforced concrete wall according to a sixth embodiment of the present invention, omitting concrete. FIG. 11 is a longitudinal sectional view of the wall of the sixth embodiment. FIG. 12 is a cross-sectional view of a reinforced concrete foundation according to a seventh embodiment of the present invention. FIG. 13 is a cross-sectional view of a reinforced concrete foundation that constitutes the eighth embodiment of the present invention.

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

Unlike the normal deformed rebar, the rebar 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, and more preferably 1. 0: 1.5 to 1.0: 2.5. In this embodiment, it is about 1: 2. The ratio is shown somewhat exaggerated in FIGS. 1A-1C.

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

The pair of vertical ribs 12 are respectively formed at the centers of the pair of arc surfaces 11 b of the base 11 and are separated in the Y-axis direction.
The lateral rib 13 has a straight portion of uniform height extending along the flat surface 11 a of the base 11 and a curved portion continuous with the straight portion and extending along the circular arc surface 11 b. The end of the curved portion Are connected to the longitudinal ribs 12.

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

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

The reinforcing bar assembly 23 is disposed at the corners of the square planar shape of the reinforcing bar assembly 23 and has four vertical main bars 24 parallel to one another, and the longitudinal direction of these main bars 24 are equally spaced. And a large number of hoop lines 10A (shear reinforcement bars) arranged.
The main rebar 24 may be a normal deformed rebar having longitudinal ribs and lateral ribs, or rebar having threaded joints (threaded rebar).

The hoop reinforcement 10A is, for example, referred to as a welded closed hoop reinforcement, which is formed by bending the straight rebar 10 having a flat cross-sectional shape shown in FIGS. 1A to 1C into a square planar shape and welding its both ends Obtained by In FIG. 3, the welded portion is indicated by reference numeral 10a, and the bent corner is indicated by reference numeral 10b. The hoop reinforcement 10A is disposed horizontally (arranged to intersect the main reinforcement 24 at a right angle). The four corners 10b of the hoop bars 10A are wound around so as to be in contact with the main bars 24 and to be wound around the outside. As a result, the hoop bars 10A surround the four main bars 24 and are 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 rectangular cross-sectional shape 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 bars 10A. The distance between the outer surface 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 the hoop reinforcement 10A is formed, the reinforcing bar 10 is bent so that the pair of

flat surfaces

11a and 11a facing each other in the minor axis X direction are the inside and the outside. The corner 10b is formed. Since the thickness in the bending direction is reduced in this manner, the load required for the bending can be small, it is easy to process, and the radius of curvature can be reduced. In the present embodiment, in particular, since the pair of

surfaces

11a and 11a facing each other in the minor axis X direction is flat (because the outline of the cross-sectional shape has a straight portion that faces the minor axis X direction), 10 can be bent without distortion to obtain hoop bars 10A arranged in one plane.

As described above, by bending the reinforcing bar 10 so that the pair of

faces

11a and 11a facing each other in the minor axis X direction is the outer side and the inner side, the minor 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 made smaller than in the case where the conventional cross-sectional shape of the reinforcing bar having the substantially circular cross-section is used. Cover thickness T of concrete can be increased.

From another point of view, it is possible to reduce the cross-sectional area of the concrete 22 corresponding to the size reduction of the hoop bars 10A while securing the prescribed cover thickness.

From another viewpoint, the positions of the main bars 24 can be arranged outward (in a direction away from the center of the column 21), and the strength of the column 21 can be enhanced. This point will be described with reference to FIG. 4B. As in the prior art, when using hoop bars 100 (represented by phantom lines in the figure) made of reinforcing bars with a circular cross section, the dimensions in the direction orthogonal to the concrete surface 22a are large and the radius of curvature of the corner 100b is also large. The position of the main reinforcement 104 for securing the depth T is a position indicated by an imaginary line. On the other hand, when the reinforcing bar 10 having a flat cross-sectional shape 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 bars 24 can be disposed outward as compared with the conventional case.

From another point of view, in the case of using the hoop bar 100 made of a reinforcing bar having a circular cross section as in the prior art, the cross section of the concrete 22 is reduced while securing the thickness of the concrete cover, In order to shift to a lower value, the diameter of the hoop 100 needs to be reduced, and the cross-sectional area of the hoop 100 is reduced. In order to compensate for the decrease in the cross-sectional area of the hoops 100, it is necessary to increase the number of hoops 100 and shorten the pitch of the reinforcing bars. On the other hand, in the present invention, when the cross-sectional area of the concrete 22 is reduced or the main bars 24 are shifted outward, it is possible to secure the concrete cover thickness without reducing the cross-sectional area of the hoop bars 10A. As a result, it is not necessary to shorten the arrangement pitch of the hoop bars 10A, and the filling property of the concrete does not deteriorate.

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 explanations thereof will be omitted.
In the column 21 of the second embodiment shown in FIG. 5, the hoop bars 10B bend the both ends of the reinforcing bar 10 without welding to form hook portions 10c (cross portions), and these hook portions 10c form one main bar 24 It is intended to be applied to The corner portions 10b of the hoops 10B and the hook portions 10c are bent in the same manner as in the first embodiment, so that 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 planar shape of the square of the reinforcing bar structure 23, the intermediate main bars 25 are also arranged at the side portions of this plane shape A shear reinforcement bar 10C is bridged between the intermediate main bars 25. That is, hook portions 10 d are formed at both ends of the shear reinforcing bars 10 C, and the hook portions 10 d are hooked on the intermediate main bars 25. The shear reinforcement bar 10C is also made of the reinforcing bar 10 having a flat cross-sectional shape like the hoop bar 10A, and the cross-sectional shape of the reinforcing bar 10 is bent so that the surfaces facing in the minor axis X direction are the outside and the inside, The hook portion 10d is formed. Therefore, the shear reinforcement bar 10C does not protrude outward beyond the hoop bar 10A, and the cover 22 of the concrete 22 is not reduced in thickness.

The fourth embodiment shown in FIG. 7 and FIG. 8 is an application of the present invention to a reinforced concrete beam 31 (a reinforced concrete structure) extending horizontally in a straight line. The beam 31 is configured by connecting reinforcing bar assemblies 33 similar in basic structure to the reinforcing bar assembly 23 of the column 21 and embedding the same in a cross-sectioned concrete 32. The connection of the reinforcing bar assembly 33 is obtained by inserting and connecting the ends of two main bars 34 arranged in a straight line into the joint 35. If the main reinforcement 34 is a threaded rebar, the joint 35 has an internal thread on its inner periphery, and the ends of the main reinforcement 34 are connected by screwing.

Hoop bars 36 surrounding the main bars 34 have a circular cross-section, as with ordinary reinforcing bars. In order to maintain the strength of the beam 31, it is necessary to bridge the joint 35 also with hoop bars 10D (additional shear reinforcement bars). Since the diameter of the joint 35 is larger than that of the main bar 34, using a reinforcing bar having a substantially circular cross section as the hoop bar 10D like the hoop bar 36 reduces the thickness of the concrete cover T between the hoop bar 10D and the concrete surface 32a. It will So, in this embodiment, the reinforcing bar 10 of the flat cross section shown in FIG. 1 is used as this hoop line | wire 10D. As in the preceding embodiment, the reinforcing bar 10 is bent so that the minor axis X is orthogonal to the concrete surface 32a, and the pair of

surfaces

11a and 11a facing each other in the minor axis X direction are on the outer side and the inner side. As a result, the reduction of the cover thickness T can be avoided.
From another point of view, it is not necessary to reduce the cross-sectional area of the hoops 10D in order to secure the cover thickness T, and it is not necessary to increase the hoops 10D and reduce the arrangement pitch to compensate for the reduction in cross-sectional area. Specifically, the hoops 10D can have the same pitch as the hoops 36.
In the fourth embodiment, the hoop bars 36 may also be formed by reinforcing bars 10 having a flat cross-sectional shape.

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

The fifth embodiment shown in FIG. 9 is an application of the present invention to a reinforced concrete wall 41 (a reinforced concrete structure spread in a planar manner). The wall 41 is formed by embedding two reinforcing bar assemblies 43 in concrete 42. The concrete 42 has vertical surfaces 42a parallel to each other, and the two reinforcing bar assemblies 43 are parallel to the concrete surfaces 42a and are respectively separated on two planes separated in the thickness direction of the concrete 42. It is arranged.

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

The flat reinforcing bar 10 shown in FIG. 1 is used as the vertical bars 10E and the horizontal bars 10F. The reinforcing bar 10 is used in a straight shape without being bent and cut into a predetermined size. The minor axis X direction of the cross-sectional shape of the reinforcing bar 10 is made orthogonal to the concrete surface 42 a.
Thereby, the thickness of the wall 42 can be reduced while securing the concrete cover thickness T and securing the concrete filling space between the reinforcing bar assemblies 43 sufficiently. Viewed another way, the concrete cover thickness T can be increased and 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 passing a pipe (not shown) or the like is formed in the wall 41, and vertical bars 10E and horizontal bars 10F of the reinforcing bar assembly are removed in a region corresponding to the opening 41a. The opening 41a may be an opening of a window or a door.
As the opening 41a is surrounded, additional vertical streaks 10E 'on the left and right and additional horizontal streaks 10F' on the top and bottom are disposed, and four diagonal streaks 10G are disposed.

In this embodiment, not only the vertical streaks 10E and the horizontal streaks 10F, but also the additional vertical streaks 10E ′, the horizontal streaks 10F ′ and the diagonal streaks 10G are made of the reinforcing bars 10 having a flat cross-sectional shape, It is orthogonal to the concrete surface 2b.

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

The seventh embodiment shown in FIG. 12 is one in which the present invention is applied to a reinforced concrete cloth foundation 50 (reinforcing steel structure). The cloth foundation 50 elongates along the wall of the house and supports the house. The cloth foundation 50 has a foundation portion 50A buried in the ground GL, and an upright portion 50B standing vertically from the foundation portion 50A. In the present application, the base portion 50A and the standing portion 50B are also regarded as reinforced concrete structures.

In the above-mentioned foundation portion 50A, the foundation-side rebar assembly 52 embedded in the concrete 51 having a rectangular cross section is disposed on a horizontal surface, and between two horizontal streaks 10H (first streaks) parallel to each other A plurality of horizontal streaks 10J (second streaks), which are orthogonal to the horizontal streak 10H and are arranged at equal intervals along the horizontal streak 10H, have a ladder shape. These

horizontal bars

10H and 10J are formed of reinforcing bars 10 having a flat cross section, and are arranged so that the minor axis X of the cross sectional shape is directed vertically, that is, orthogonal to the upper and lower

horizontal surfaces

51a and 51a of concrete 51. ing.

In the upright portion 50B, the upright portion reinforcing bar assembly 54 embedded in the concrete 53 having a rectangular cross section is disposed on a vertical surface (that is, on a plane parallel to the right and left

vertical surfaces

53a and 53a of the concrete 53) Two parallel horizontal muscles 10K (first muscle), and a number of vertical muscles 10L (second muscle) which are laid between the horizontal muscles 10K and arranged at equal intervals along the horizontal muscle 10K Have a ladder shape. The lower end of the upright portion reinforcing bar assembly 54 is fixed substantially at the center of the foundation side reinforcing bar assembly 52.

The horizontal bars 10K and the vertical bars 10L are formed of reinforcing bars 10 having a flat cross section, and the cross-sectional short axis X extends in the thickness direction of the concrete 53, that is, orthogonal to the left and right

vertical surfaces

53a and 53a of the concrete 53 So it is oriented.

In addition, the standing part side rebar assembly 54 of this embodiment has the middle horizontal streak 10M which is parallel to the two horizontal streaks 10K and disposed therebetween. The cross-sectional area of this intermediate muscle 10M is smaller than the horizontal muscle 10K. Therefore, as in the present embodiment, the reinforcing bar 10 having a flat cross section may be used similarly to the longitudinal bars 10K, or the cross section may be circular.

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

The horizontal slab 60A 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

61a, 61a of the concrete 61. The reinforcing bar assembly 62 is in the form of a net having a large number of horizontal streaks 10P (first streak) parallel to one another and a large number of horizontal streaks 10Q (second streak) orthogonal to the horizontal streaks 10P. . These

first streaks

10P and 10Q are formed of reinforcing bars 10 having a flat cross section, and oriented so that the minor axis X of the cross sectional shape extends vertically, that is, orthogonal to the upper and lower

horizontal surfaces

61a and 61a of the concrete 61. ing.

In the outdoor side upright portion 60B, the reinforcing bar assembly 64 embedded in the concrete 63 having a rectangular cross section is disposed on a vertical surface parallel to the left and right flat

vertical surfaces

63a and 63a of the concrete 63. A plurality of horizontal streaks 10R (first streaks) arranged in parallel, and a plurality of vertical streaks 10S (crossed between the horizontal streaks 10R and equally spaced along the horizontal streaks 10R) And the second muscle). The horizontal bar 10R and the vertical bar 10S are made of reinforcing bars 10 having a flat cross section, and the short axis X of the cross sectional shape extends in the thickness direction of the concrete 63, that is, orthogonal to the left and right

vertical surfaces

63a and 63a of the concrete 63 So it is oriented.

The horizontal bar 10S is bent at the lower end portion located at the intersection of the horizontal slab 60A and the outdoor side upright portion 60B. That is, a pair of

surfaces

11a and 11a which face each other in the minor axis direction of the reinforcing bar 10 having a flat cross section are bent so as to be outside and inside.

The indoor side upright portion 60C is formed of a 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 given to reinforcing bars used and the description will be omitted.

The present invention is not limited to the above embodiment, and various forms can be adopted. For example, the rebar having a flat cross-sectional shape may have a shape obtained by crushing a threaded rebar.
The reinforcing bar having a flat cross-sectional shape may have an elliptical cross-sectional shape.

The hoop bars (shear reinforcement bars) used for reinforced concrete structures such as columns and beams may be spiral hoop bars. In this case, the wound portions are arranged at intervals in the longitudinal direction of the reinforced concrete structure.

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

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

Claims

In a rebar assembly used in a reinforced concrete structure and embedded in concrete, the rebar assembly includes a rebar having a flat cross-sectional shape, the rebar having a flat cross-sectional shape extends along a surface of the concrete, and the cross-sectional shape A rebar assembly characterized in that the minor axis direction of the is disposed orthogonal to the surface of the concrete.
The rebar assembly according to claim 1, used for the reinforced concrete structure extending linearly,
A plurality of main bars extending in a straight line in the longitudinal direction of the reinforced concrete structure parallel to each other, and an annular or spiral shape spaced apart in the longitudinal direction of the main bars and disposed so as to surround these main bars Equipped with shear reinforcement bars,
The shear reinforcing bars are disposed at the outermost side of the reinforcing bar assembly, and are formed of reinforcing bars having the flat cross-sectional shape, and a pair of surfaces facing in the minor axis direction are bent so as to be inside and outside. Rebar assembly to be.
The rebar assembly according to claim 1, used for the reinforced concrete structure extending linearly,
A plurality of main bars extending in a straight line in the longitudinal direction of the reinforced concrete structure parallel to each other, and an annular or spiral shape spaced apart in the longitudinal direction of the main bars and disposed so as to surround these main bars Equipped with shear reinforcement bars,
And a cylindrical joint connecting the main bars arranged in a straight line, and an additional shear reinforcing bar disposed to surround the joint,
A rebar assembly characterized in that at least the additional shear reinforcement comprises the rebar having the flat cross-sectional shape, and a pair of surfaces facing in the minor axis direction are inside and outside.
2. The rebar assembly according to claim 1, wherein the rebar assembly according to claim 1 is used in a reinforced concrete structure having a pair of flat concrete surfaces which extend in a plane and are parallel to each other and is disposed on a plane parallel to the pair of concrete surfaces. ,
A plurality of first muscles and a plurality of second muscles orthogonal to each other,
A rebar assembly characterized in that at least one of the first and second bars is made of the rebar having the flat cross-sectional shape, and the minor axis direction is orthogonal to the concrete surface.
It is used for a reinforced concrete structure having a pair of flat concrete surfaces which extend in a plane and are parallel to each other and an opening penetrating between the concrete surfaces, and is disposed on a plane parallel to the pair of concrete surfaces. The rebar assembly described in
A plurality of first lines and a plurality of second lines orthogonal to each other, and a plurality of oblique lines arranged to be inclined with respect to the first and second lines and surround the opening;
A rebar assembly characterized in that at least the oblique bars are made of the rebar having the flat cross-sectional shape, and the short axis direction is orthogonal to the concrete surface.
A reinforced concrete structure obtained by embedding the reinforcing bar assembly according to any one of claims 1 to 5 in the concrete.
In a shear reinforcement muscle which is placed between or surrounded by a plurality of linearly extending parallel bars in parallel with each other,
A shear reinforcing bar comprising a reinforcing bar having a flat cross-sectional shape and being bent so that a pair of surfaces facing in the minor axis direction of the cross-sectional shape are on the inside and the outside.
A base and a rib formed on the outer periphery of the base, wherein the profile of the cross-sectional shape of the base has a pair of straight portions facing in the short axis direction. Shear reinforcement bars.
The rib includes a pair of longitudinal ribs extending in the longitudinal direction of the shear reinforcing bars and facing the long axis direction of the flat cross-sectional shape, and a transverse rib formed between the longitudinal ribs and extending in a direction intersecting the longitudinal ribs. The shear reinforcement bar according to claim 8, characterized in that.