JP2003049500A - Concrete member - Google Patents
Concrete memberInfo
- Publication number
- JP2003049500A JP2003049500A JP2001239467A JP2001239467A JP2003049500A JP 2003049500 A JP2003049500 A JP 2003049500A JP 2001239467 A JP2001239467 A JP 2001239467A JP 2001239467 A JP2001239467 A JP 2001239467A JP 2003049500 A JP2003049500 A JP 2003049500A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- wall
- reinforcing
- earthquake
- crack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 40
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 61
- 238000010276 construction Methods 0.000 abstract description 6
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 230000000979 retarding effect Effects 0.000 abstract 1
- 210000003205 muscle Anatomy 0.000 description 7
- 230000008602 contraction Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Load-Bearing And Curtain Walls (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コンクリート製部
材に関し、特にひび割れを抑制する機能を備えたコンク
リート製部材に関する。TECHNICAL FIELD The present invention relates to a concrete member, and more particularly to a concrete member having a function of suppressing cracking.
【０００２】[0002]
【従来の技術】コンクリート製部材としては、例えば建
物を構成し内部に鉄筋が配筋された鉄筋コンクリート製
の耐震壁などがある。鉄筋コンクリート製の耐震壁は鉄
筋によって補強されているものの、地震等によって建物
に層間変形が生じると剪断応力が作用して壁面にひび割
れが生じる。このひび割れは、地震動が治まって剪断応
力が解除された後も残存する場合があり、残存したひび
割れに水などが浸入すると鉄筋に錆が発生し、耐震壁の
耐力が低下する虞がある。このため、近年では耐震壁内
にプレストレスを導入したＰＣ鋼線等を埋設することに
よって剪断応力に対抗させてひび割れを抑制させること
等が行われている。2. Description of the Related Art Concrete members include, for example, a reinforced concrete earthquake-resistant wall that constitutes a building and has reinforcing bars arranged inside. Although the reinforced concrete earthquake-resistant wall is reinforced by reinforcing steel, shear stress acts on the wall surface when the building undergoes interlayer deformation due to an earthquake or the like, causing cracks on the wall surface. These cracks may remain even after the earthquake motion subsides and the shear stress is released, and if water or the like enters the remaining cracks, rust may occur in the reinforcing bars, and the yield strength of the earthquake-resistant wall may decrease. For this reason, in recent years, by embedding a prestressed PC steel wire or the like in an earthquake resistant wall, it has been performed to counteract shear stress and suppress cracking.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、埋設す
るＰＣ鋼線にプレストレスを導入するには、施工現場に
おいて専用の機材を使った大規模な工事を伴い、煩雑な
作業と多大な労力を必要とするとともに、施工費用が高
騰し工期も長期化してしまうという課題があった。However, in order to introduce prestress into the PC steel wire to be buried, a large amount of work is required at the construction site using dedicated equipment, and complicated work and great labor are required. In addition, there was a problem that construction cost would rise and construction period would be prolonged.
【０００４】本発明はかかる従来の課題に鑑みて成され
たもので、簡易な施工でひび割れを抑制することが可能
なコンクリート製部材を提供することを目的とする。The present invention has been made in view of such conventional problems, and an object thereof is to provide a concrete member capable of suppressing cracks by simple construction.
【０００５】[0005]
【課題を解決するための手段】かかる目的を達成するた
めに請求項１に記載のコンクリート製部材は、コイル状
に形成された筋部材が、少なくとも２カ所で定着されて
いることを特徴とする。In order to achieve the above object, the concrete member according to the first aspect is characterized in that the coil-shaped reinforcing member is fixed at at least two places. .
【０００６】この構成によれば、コンクリート製部材に
剪断ひび割れが生じて当該コンクリート製部材が膨張す
ると、これに定着された筋部材に伸びが生じる。このと
き筋部材には前記伸びに応じた収縮力が発生し、この収
縮力によって前記コンクリート製部材に生じたひび割れ
の拡大を抑えることができる。すなわち、ひび割れが発
生した場合、ひび割れの原因である剪断応力が解除され
た後には筋部材の前記収縮力がひび割れ部分を互いに引
きつけるように作用するので、ひび割れによって発生し
た隙間を塞ぐことができる。According to this construction, when a shear crack occurs in the concrete member and the concrete member expands, the stiffener fixed to the concrete member expands. At this time, a contraction force corresponding to the elongation is generated in the muscle member, and the contraction force can suppress the expansion of the cracks generated in the concrete member. That is, when a crack occurs, the contracting force of the muscle member acts so as to attract the cracked portions to each other after the shearing stress that causes the crack is released, so that the gap generated by the crack can be closed.
【０００７】また、筋部材がコイル状に形成されている
ので、筋部材とコンクリートとの滑りが抑止され、筋部
材のみがコンクリートからずれて移動したり、抜けたり
しないため、コンクリート製部材に生じたひび割れに応
じて確実に収縮力を発生させることができる。Further, since the reinforcing member is formed in a coil shape, slippage between the reinforcing member and concrete is suppressed, and only the reinforcing member does not move or slip out of the concrete, so that the reinforcing member is generated in the concrete member. The contraction force can be reliably generated according to the crack.
【０００８】また、ひび割れを抑制する力は、ひび割れ
に伴うコンクリートの膨張により筋部材が伸張されるこ
とによって発生するため、筋部材に予めプレストレスを
導入する必要はなく、簡単に施工することができる。Further, since the force for suppressing the crack is generated by the expansion of the reinforcing member due to the expansion of the concrete accompanying the crack, it is not necessary to pre-stress the reinforcing member in advance, and the reinforcing member can be easily installed. it can.
【０００９】請求項２に記載の発明は、前記コンクリー
ト製部材は鉄筋コンクリート製であり、前記コイル状の
筋部材が、少なくとも２本の鉄筋を囲むように配置され
ていることを特徴とする。According to a second aspect of the present invention, the concrete member is made of reinforced concrete, and the coil-shaped reinforcing member is arranged so as to surround at least two reinforcing bars.
【００１０】この発明によれば、コンクリート内に配筋
された少なくとも２本の鉄筋はコイル状の筋部材によっ
て囲まれる。このため、これら少なくとも２本の鉄筋は
筋部材によって拘束されることになるので、鉄筋の変形
を抑制してコンクリート製部材の靱性を高めることがで
きる。According to the present invention, at least two reinforcing bars arranged in concrete are surrounded by a coil-shaped reinforcing member. Therefore, these at least two reinforcing bars are restrained by the reinforcing members, so that the deformation of the reinforcing bars can be suppressed and the toughness of the concrete member can be enhanced.
【００１１】[0011]
【発明の実施の形態】以下、本発明のコンクリート製部
材を耐震壁に適用した実施形態を添付図面を参照して詳
細に説明する。図１は本発明のコンクリート製部材の一
実施形態を示す耐震壁の配筋状態を示す概念図であり、
図２は図１におけるＡ−Ａ断面図である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments in which the concrete member of the present invention is applied to an earthquake resistant wall will be described in detail below with reference to the accompanying drawings. FIG. 1 is a conceptual diagram showing a reinforcing bar state of an earthquake resistant wall showing an embodiment of a concrete member of the present invention,
2 is a sectional view taken along line AA in FIG.
【００１２】この耐震壁１０は、鉄筋コンクリート造建
物の梁３０と柱３２とで囲まれた空間に設けられ、その
内部には多数の壁縦筋１２、壁横筋１４、およびコイル
状に形成された筋部材をなす鉄筋１６が配筋されてい
る。This earthquake-resistant wall 10 is provided in a space surrounded by beams 30 and columns 32 of a reinforced concrete building, and has a large number of vertical wall bars 12, horizontal wall bars 14, and coil shapes formed therein. Reinforcing bars 16 forming a muscle member are arranged.
【００１３】壁縦筋１２は耐震壁１０の両壁面に沿って
それぞれ列をなし、壁幅方向に間隔を隔てて配筋されて
いる。また、壁横筋１４は耐震壁１０の高さ方向に間隔
を隔てて壁縦筋１２の外側に配置され、壁縦筋１２とと
もに格子をなすように設けられている。The wall vertical stripes 12 are arranged in rows along both wall surfaces of the seismic resistant wall 10 and are arranged at intervals in the wall width direction. Further, the wall transverse ribs 14 are arranged outside the wall longitudinal ribs 12 at intervals in the height direction of the earthquake-resistant wall 10, and are provided so as to form a lattice together with the wall longitudinal ribs 12.
【００１４】前記コイル状の鉄筋１６は、例えば直径約
１０ｍｍの鉄筋で形成され、壁横筋１４を取り囲むよう
に壁横筋１４に沿って巻き付けられている。このコイル
状の鉄筋１６は壁幅方向の端部近傍において耐震壁１０
に定着されている。The coil-shaped reinforcing bar 16 is formed of, for example, a reinforcing bar having a diameter of about 10 mm, and is wound along the wall transverse bar 14 so as to surround the wall transverse bar 14. The coil-shaped reinforcing bar 16 is located near the end in the wall width direction of the earthquake-resistant wall 10.
Has been established in.
【００１５】前記鉄筋１６の耐震壁１０への定着方法と
しては、壁幅方向の端部近傍において壁縦筋１２および
壁横筋１４に鉄筋１６を溶接する方法や、ねじ状に形成
した鉄筋１６の両端部を耐震壁１０の端部から突出させ
るとともに、コンクリート打設後にその端部にナットを
螺着する方法などがある。As a method of fixing the reinforcing bar 16 to the earthquake-resistant wall 10, a method of welding the reinforcing bar 16 to the vertical wall wall 12 and the horizontal wall bar 14 in the vicinity of the end portion in the width direction of the wall, or a reinforcing bar 16 formed in a screw shape is used. There is a method in which both ends are projected from the ends of the earthquake-resistant wall 10 and nuts are screwed to the ends after placing concrete.
【００１６】本実施形態によれば、地震等によって建物
が層間変形し耐震壁１０が膨張して剪断ひび割れが発生
すると、これに定着された鉄筋１６に伸びが生じる。こ
のとき、鉄筋１６には前記伸びに応じた収縮力が発生
し、この収縮力によって、前記耐震壁１０に生じたひび
割れの拡大を抑えることができる。すなわち、ひび割れ
が発生した場合、ひび割れの原因である剪断応力が解除
された後には、鉄筋１６の収縮力がひび割れ部分を互い
に引きつけるように作用するので、ひび割れによって発
生した隙間を塞ぐことができる。According to the present embodiment, when a building undergoes interlayer deformation due to an earthquake or the like and the earthquake-resistant wall 10 expands and shear cracks occur, the reinforcing bars 16 anchored thereto expand. At this time, a contracting force corresponding to the elongation is generated in the reinforcing bar 16, and the contracting force can suppress the expansion of the crack generated in the earthquake-resistant wall 10. That is, when a crack occurs, after the shearing stress that causes the crack is released, the contracting force of the reinforcing bar 16 acts to attract the cracked portions to each other, so that the gap generated by the crack can be closed.
【００１７】また、鉄筋１６はコイル状に形成されてい
るので、コンクリートと鉄筋１６との滑りが抑止され
る。このため、コイル状の鉄筋１６のみがコンクリート
からずれて移動することはなく、耐震壁１０に生じたひ
び割れに応じて確実に収縮力を発生させることができ
る。Further, since the reinforcing bar 16 is formed in a coil shape, slip between the concrete and the reinforcing bar 16 is suppressed. Therefore, only the coil-shaped reinforcing bar 16 does not move out of the concrete, and the contracting force can be reliably generated according to the crack generated in the earthquake-resistant wall 10.
【００１８】上述のように、ひび割れを抑制する力はひ
び割れに伴うコンクリートの膨張により鉄筋１６が伸張
されることによって発生するため、この鉄筋１６には予
めプレストレスを導入する必要はなく、自由長のまま配
筋するだけの簡単な作業によって短時間で施工すること
ができる。As described above, the force for suppressing the cracks is generated by the expansion of the reinforcing bars 16 due to the expansion of the concrete accompanying the cracks. Therefore, it is not necessary to pre-stress the reinforcing bars 16 in advance, and the free length is not required. It can be installed in a short time by a simple work of just arranging the bars as they are.
【００１９】さらに、壁幅の端部近傍において鉄筋１６
と耐震壁１０とを定着したので、鉄筋１６は定着部間で
発生するコンクリート部の膨張やひび割れによって伸張
し、耐震壁１０の全面で発生するひび割れを抑えること
ができる。Further, in the vicinity of the end portion of the wall width, the reinforcing bar 16
Since the earthquake-proof wall 10 and the earthquake-proof wall 10 are fixed, the reinforcing bars 16 expand due to expansion and cracking of the concrete portion generated between the fixing portions, and cracks generated on the entire surface of the earthquake-proof wall 10 can be suppressed.
【００２０】上記実施形態においては、鉄筋１６を壁幅
の端部近傍において定着する例を示したが、これに限ら
ず、コンクリートによって鉄筋１６の全周面が固着され
ていても良く、この場合にはひび割れによってコンクリ
ートと鉄筋１６との固着状体が部分的に分断されても、
その分断部分を挟むように固着されている２つの部位間
で鉄筋１６が伸縮するのでひび割れによる間隙を閉塞さ
せることができる。In the above embodiment, an example in which the reinforcing bars 16 are fixed near the ends of the wall width is shown, but the invention is not limited to this, and the entire peripheral surface of the reinforcing bars 16 may be fixed by concrete. Even if the adhered material between the concrete and the reinforcing bar 16 is partially divided by cracks,
Since the reinforcing bar 16 expands and contracts between the two parts which are fixed so as to sandwich the divided part, the gap due to the crack can be closed.
【００２１】また、耐震壁１０内の横縦筋１４は、壁厚
方向に間隔を隔てて配筋され、これら横縦筋１４を取り
囲みその変形を拘束するようにコイル状の鉄筋１６が配
筋されているので、コイル状の鉄筋１６は幅止め筋とし
て機能する。このため、耐震壁１０が地震等で圧縮さ
れ、壁横筋１４に壁幅が厚くなる方向に膨張する力が作
用しても、コイル状の鉄筋１６が壁横筋１４の変形を抑
制することによって耐震壁１０に高い靭性を備えること
ができる。The horizontal and vertical reinforcing bars 14 in the earthquake-resistant wall 10 are arranged at intervals in the wall thickness direction, and coil-shaped reinforcing bars 16 surround the horizontal and vertical reinforcing bars 14 so as to restrain their deformation. Therefore, the coil-shaped reinforcing bar 16 functions as a width stop bar. Therefore, even if the earthquake-resistant wall 10 is compressed by an earthquake or the like and the force that expands the wall transverse reinforcement 14 in the direction of increasing the wall width acts, the coil-shaped reinforcing bar 16 suppresses the deformation of the wall transverse reinforcement 14 and thus the earthquake resistance is increased. The wall 10 can be provided with high toughness.
【００２２】本実施形態では、鉄筋１６を壁横筋１４に
沿って設けた例を示したが、壁縦筋１２に沿う方向やそ
の他の方向に向けて設けても構わない。また、コイル状
の筋部材を鉄筋としたが、例えばアラミド繊維等の適宜
な強度を備えた筋部材であればこれに限るものではな
い。In this embodiment, the reinforcing bar 16 is provided along the wall transverse bar 14, but it may be arranged along the wall longitudinal bar 12 or in any other direction. Although the coil-shaped reinforcing member is a reinforcing bar, the reinforcing member is not limited to this as long as it is a reinforcing member having an appropriate strength such as aramid fiber.
【００２３】なお、本発明は鉄筋コンクリート造建物に
限ることなく、無筋コンクリートを含むコンクリート製
部材全般に適用することが可能である。The present invention is not limited to reinforced concrete buildings, but can be applied to all concrete members including reinforced concrete.
【００２４】[0024]
【発明の効果】以上説明したように本発明によれば、コ
ンクリート製部材に剪断ひび割れが生じると、筋部材が
伸張されその伸張に応じた収縮力が発生するので、この
収縮力によってひび割れを抑えることができる。また、
ひび割れの原因である剪断応力が解除された後には、筋
部材の収縮力によりひび割れによる間隙を塞ぐことがで
きる。As described above, according to the present invention, when a shear crack occurs in a concrete member, the reinforcing member is stretched and a contracting force corresponding to the expansion is generated. Therefore, the contracting force suppresses the crack. be able to. Also,
After the shear stress that causes the crack is released, the contraction force of the muscle member can close the gap caused by the crack.
【００２５】前記筋部材はコイル状に形成されているの
でコンクリートと筋部材との滑りが抑止され、ひび割れ
に応じて確実に収縮力を発生させることができる。Since the reinforcing member is formed in a coil shape, slippage between the concrete and the reinforcing member is suppressed, and a contracting force can be reliably generated according to a crack.
【００２６】さらに、ひび割れを抑制する力はひび割れ
に伴って筋部材が伸張されることによって発生するた
め、この筋部材を配筋するだけの簡単な作業によってひ
び割れを抑制する機能を備えることができる。Further, since the force for suppressing the cracks is generated by the stretching of the muscle members associated with the cracks, the function of suppressing the cracks can be provided by a simple work of simply arranging the muscle members. .
【００２７】また、コイル状の筋部材をコンクリート内
の少なくとも２本の鉄筋を囲むように配置することで、
これら鉄筋を拘束してコンクリート製部材の靱性を高め
ることができる。Further, by arranging the coil-shaped reinforcing member so as to surround at least two reinforcing bars in concrete,
The toughness of the concrete member can be enhanced by restraining these reinforcing bars.
【図１】本発明のコンクリート製部材の一実施形態を示
す耐震壁の配筋状態を示す概念図である。FIG. 1 is a conceptual diagram showing a reinforcing bar state of a seismic wall showing an embodiment of a concrete member of the present invention.
【図２】図１に示すＡ−Ａ断面図である。FIG. 2 is a cross-sectional view taken along the line AA shown in FIG.
１０ 耐震壁（コンクリート製部材） １２ 壁縦筋 １４ 壁横筋 １６ 鉄筋（補強筋） 10 Earthquake-resistant wall (concrete member) 12 Wall vertical muscle 14 lateral wall 16 Reinforcing bar (reinforcing bar)
Claims (2)
とも２カ所で定着されていることを特徴とするコンクリ
ート製部材。1. A concrete member characterized in that the coil-shaped reinforcing member is fixed at at least two positions.
ート製部材であり、 前記筋部材が、少なくとも２本の鉄筋を囲むように配置
されていることを特徴とする請求項１に記載のコンクリ
ート製部材。2. The concrete member according to claim 1, wherein the concrete member is a reinforced concrete member, and the reinforcing member is arranged so as to surround at least two reinforcing bars.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001239467A JP2003049500A (en) | 2001-08-07 | 2001-08-07 | Concrete member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001239467A JP2003049500A (en) | 2001-08-07 | 2001-08-07 | Concrete member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003049500A true JP2003049500A (en) | 2003-02-21 |
Family
ID=19070214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001239467A Pending JP2003049500A (en) | 2001-08-07 | 2001-08-07 | Concrete member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003049500A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8418428B2 (en) | 2010-01-06 | 2013-04-16 | Unitrex Corporation | Embedded mesh in precast walls |
-
2001
- 2001-08-07 JP JP2001239467A patent/JP2003049500A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8418428B2 (en) | 2010-01-06 | 2013-04-16 | Unitrex Corporation | Embedded mesh in precast walls |
| US8667764B2 (en) | 2010-01-06 | 2014-03-11 | Unistress Corporation | Embedded mesh in precast walls |
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