JP2004027714A - Reinforcement structure of existing reinforced concrete structure - Google Patents

Reinforcement structure of existing reinforced concrete structure Download PDF

Info

Publication number
JP2004027714A
JP2004027714A JP2002187740A JP2002187740A JP2004027714A JP 2004027714 A JP2004027714 A JP 2004027714A JP 2002187740 A JP2002187740 A JP 2002187740A JP 2002187740 A JP2002187740 A JP 2002187740A JP 2004027714 A JP2004027714 A JP 2004027714A
Authority
JP
Japan
Prior art keywords
reinforcing
reinforced concrete
column
reinforcing plate
existing reinforced
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
Application number
JP2002187740A
Other languages
Japanese (ja)
Inventor
Akio Suzuki
鈴木 秋夫
Tsuguhiko Yoshino
吉野 次彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Tekko Co Ltd
Original Assignee
Tokyo Tekko Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokyo Tekko Co Ltd filed Critical Tokyo Tekko Co Ltd
Priority to JP2002187740A priority Critical patent/JP2004027714A/en
Publication of JP2004027714A publication Critical patent/JP2004027714A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Working Measures On Existing Buildindgs (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of efficiently reinforcing a structure such as a column and a beam made of existing reinforced concrete by simple construction. <P>SOLUTION: The existing reinforced concrete column 1 (structure) is surrounded by a plurality of reinforcing plates 11. Its outer side is surrounded by a plurality of bar members 20. A pressing member 30 is arranged at a corner of the column 1 to connect end parts of two bar members 20 while they are pulled by the pressing member 30. The pressing member 30 is pressed against the reinforcing plate 11 by pulling force, and the reinforcing plate 11 is pressed against the column 1 to restrain it. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
この発明は、既設の鉄筋コンクリート製の柱や梁等の構造体を補強して耐震性等を向上させる構造に関する。
【0002】
【従来の技術】
既設の鉄筋コンクリート柱の耐震補強工法として、柱を鋼板で巻き立て、柱周方向に隣り合う鋼板の端部どうしを溶接するとともに、これら鋼板と柱との間に無収縮モルタル等のグラウト剤を充填することが行なわれている。柱に繊維シートを巻き付けて樹脂(接着剤)で固定する手段も知られている。
【0003】
【発明が解決しようとする課題】
鋼板巻立工法では、溶接やグラウト剤の充填等の作業が煩雑であるだけでなく、鋼板の厚さをグラウトの圧力に耐えるために大きくしなければならず重量が大きくなり、設置作業も大変で時間がかかりコスト高であるという問題があった。繊維シート巻付工法でも、シートを幾重にも巻いたり樹脂を塗布したりしなければならず繁雑であった。また、何れの工法でも、壁が一体に付いている柱や、床スラブと一体の梁には、適用不能であった。
本発明は、上記事情に鑑みてなされたものであり、その目的とするところは、柱や梁等の既設鉄筋コンクリート構造体を簡単な施工で効率的に補強でき、スラブと一体の構造体にも適用可能な補強構造を提供することにある。
【0004】
【課題を解決するための手段】
上記目的を達成するため、本発明に係る補強構造は、柱や梁等の既設鉄筋コンクリート構造体を囲む複数の補強板と、これら補強板を上記構造体に拘束する板拘束装置とを備え、この板拘束装置が、上記構造体の周りの補強板を囲む複数の棒部材と、隣り合う2つの棒部材を引張り状態で連結するとともにその引張り力によって上記補強板の外側面に押し当てられ、ひいては補強板を上記構造体の周面に押し当てて拘束する押し当て部材とを有していることを特徴とする。これによって、溶接やグラウト剤の注入作業をしなくても補強板を構造体に簡単に拘束することができる。しかも、拘束装置で補強板を構造体に押し当てることにより、コンクリートを締め付けて強度を増大させることができる。これによって、簡単な施工で効率的に構造体を補強できる。また、補強板は、グラウト剤による内圧に耐える必要がないので、薄肉にすることができ、ひいては軽量になって施工の一層の容易化を図ることができる。
【0005】
ここで、上記押当て部材が、上記補強板に当てられる本体部と、この本体部の上記囲み方向に沿う両端部に設けられた定着部とを有し、この定着部に上記棒部材の端部がボルト締めにより引張られた状態で連結されていることが望ましい。これによって、簡単な構成で確実に引張り力を付与できる。棒部材の端部に雄ネジを形成することによりボルトとし、これにナットを螺合してもよく、棒部材の端部にナット部材を固定し、これにボルトを螺合してもよい。
【0006】
上記押当て部材が、上記囲み方向に隣り合う補強板の端部間に跨っていることが望ましい。これによって、1つの押当て部材で2つの補強板を押え付けることができるとともに、各補強板の両端部を押当て部材で押え付けて拘束することができる。
【0007】
上記構造体が柱であり、この柱に鉄筋コンクリートの壁が一体に連なっている場合には、この壁に貫通孔を形成し、この貫通孔に上記棒部材を通すことが望ましい。また、上記構造体が梁であり、この梁に鉄筋コンクリートの床スラブが一体に連なっている場合には、この床スラブに貫通孔を形成し、この貫通孔に上記棒部材を通すことが望ましい。これによって、壁付きの柱や、床スラブ付きの梁にも、当該補強構造を適用することができる。これら壁付き柱や床スラブ付き梁では、壁や床スラブを挟んで両側に補強板を配置し、上記壁や床スラブを貫通する棒部材を上記両側の補強板間に跨らせるようにしてもよい。壁や床スラブと柱や梁の一側面どうしが面一になっている場合には、壁や床スラブを貫通する棒部材の一端部を、上記面一になった一側面に定着させてもよい。この面一の一側面には、補強板を設けないことにしてもよい。このように、壁や床スラブと一体の構造体では、その一部を補強板で囲むことになる。
【0008】
上記柱が角柱形状である場合には、上記棒部材が、上記構造体の側面ごとに配され、上記押当て部材が、上記構造体の角ごとに配されて当該角と同角に折れているのが望ましい。これによって、施工を一層容易に行なうことができる。補強板は、構造体の側面ごとに配されていてもよく、構造体の角ごとに配されて当該角と同角に折れていてもよい。補強板が構造体の側面ごとに配されている場合には、押当て部材は、構造体の2つの側面の補強板間に跨ることになる。この場合、さらに、各補強板の一端部を構造体の角と同角に折曲して、隣りの補強板の外側面に重ね、その外側に押当て部材を被せることにしてもよい。これによって、補強板を構造体に一層確実に拘束することができる。補強板が構造体の角ごとに配される場合には、補強板の両端部が、構造体の側面のほぼ中央に位置されるようにし、これによって、構造体の各側面の中央部において、隣り合う2つの補強板の端部どうしが近接して対峙されるようにするのが望ましい。そして、構造体の側面ごとに配された棒部材の中間部に、上記2つの補強板の端部にそれぞれ当たる当接部を設け、上記引張りに伴って上記当接部が補強板の端部を構造体の側面へ押し付けるようにするのが望ましい。
【0009】
【発明の実施の形態】
以下、本発明の実施形態を図面にしたがって説明する。
図1及び図2は、本発明の第1実施形態を示し、四角柱形状の既設鉄筋コンクリート柱1(構造体)の周囲に柱補強構造10が構築されている。柱補強構造10は、柱1の4つの側面にそれぞれ直接当接された平らな鋼製の補強板11と、全体として環状をなして、上記補強板11を取り囲む補強板拘束装置12とを備えている。各補強板11は、柱1に沿って上下に長く延びている。補強板11の幅は、添えられるべき柱1の側面の幅とほぼ同じになっている。これによって、柱1の全周が補強板11で取り囲まれている。なお、地震時には柱1の上下端部で応力を受けやすいので、柱1の上側と下側にだけ補強構造10を設置することにしてもよい。
【0010】
拘束装置12は、柱1の高さ方向に離れて複数配されている。各拘束装置12は、4つの押当て部材30と4つのタイロッド(棒部材)20を備えている。4つの押当て部材30は、柱1の4つの角にそれぞれ配置されている。これら押当て部材30は、鋼材により出来ており、直角に折れてL字状をなす本体部31と、この本体部31の各片の端部から直角に突出するように設けられた一対の定着部32とを有している。そして、L字状の本体部31が、柱1の角を挟んで隣り合う2つの補強板11の端部間に跨り、これら補強板11の外側面に当てられている。なお、押当て部材30には、補強用のリブや鍔を設けてもよい。
【0011】
4つのタイロッド20は、柱1の4つの側面にそれぞれ配されている。これらタイロッド20は、直線状に延びる異形鋼棒で構成されている。図3及び図4に示すように、タイロッド20の両端部には、それと同軸をなす鋼製のスリーブ(ナット部材)21が圧着により連なっている。スリーブ21の内周面には、雌ネジ21aが形成されている。図1及び図2に示すように、タイロッド20とその両端のスリーブ21とを合わせた全体の長さは、補強板11の幅より短くなっている。
【0012】
各タイロッド20は、補強板11の外側面に沿うように水平に延び、該補強板11の両端部の(柱1の2つの角の)押当て部材30どうしの間に架け渡されている。この状態で、タイロッド20の両端部のスリーブ21が、押当て部材30の定着部32に近接して対峙されている。そして、定着部32に形成された挿通孔32aにボルト22が通され、このボルト22がスリーブ21の雌ネジ21aに強くねじ込まれている。これによって、タイロッド20に引張り力が付与されている。この引張り力によって、タイロッド20の両端の押当て部材30どうしが互いに接近する方向に付勢されている。ひいては、4つの押当て部材30どうしが、互いに接近する方向に付勢され、これにより、補強板11を柱1に押し当てている。このようにして、補強板11が拘束装置12によって柱1に拘束されている。この結果、柱1が締め付けられ、耐震性が高められている。発明者の実験によれば、耐剪断破壊の最大荷重を補強前に対して1.22倍に高めることができた。
【0013】
上記の補強構造10によれば、補強板11を外側から縛り付けて拘束することができ、補強板11どうしの溶接等の連結作業を行なう必要がなく、グラウト剤を注入する必要もない。これによって、簡単な施工で効率的に柱1を補強することができ、施工コストを大幅に低廉化できる。また、補強板11は、外側から縛り付けられるものであり、グラウト剤による内圧に耐える必要がないので、薄肉、軽量にすることができ、施工の一層の容易化を図ることができる。しかも、補強板11が、面をもって柱1に押し当てられているので、拘束装置12の締め付け力を柱1に広範囲に伝えることができる。したがって、上下に隣り合う拘束装置12の間隔を、補強板11が無いとした場合よりも離すことができる。これによって、拘束装置12の設置数が少なくて済み、施工を一層効率化できる。
【0014】
次に、本発明の他の実施形態を説明する。以下の実施形態において、既述の実施形態と重複する構成に関しては、図面に同一符号を付して説明を省略する。
図5は、本発明の第2実施形態に係る柱補強構造10Aを示したものである。この実施形態では、各補強板11の柱周方向に沿う一端部が、直角に折曲されている。この折曲部11aが、隣りの側面の補強板11の外側面に重ねられている。この折曲部11aの外側に押当て部材30が被せられている。この実施形態によれば、補強板11のずれを防止できるとともに、補強板11を二重に押え付けることができ、一層確実に拘束することができる。また、補強板11の設置時に位置決め等がしやすくなり、施工をより一層容易化できる。
【0015】
本発明の補強構造は、壁付きの柱にも適用できる。すなわち、図6に示すように、本発明の第3実施形態に係る柱補強構造10Bでは、鉄筋コンクリート柱1Bの左右の側部に鉄筋コンクリート製の袖壁2が一体に連なっている。袖壁2を挟んで前後両側の柱1Bの左右側面には、それぞれ幅狭の補強板11Sが添えられている。各補強板11Sの袖壁2側の端部は、ジベル40(補強板端部定着部材)によって柱1Bに定着されている。補強板11Sの袖壁2とは逆側の端部は、直角に折曲されている。この折曲部11aが、柱1Bの前後の側面に配された補強板1の外側に重ねられている。さらに、折曲部11aの外側に押当て部材30が被せられている。左右の袖壁2には、それぞれ貫通孔2aが形成され、この貫通孔2aにタイロッド20が通されている。このタイロッド20は、袖壁2を挟んで前後両側の補強板11S間に跨っている。これによって、壁付きの柱1Bであっても確実に補強を行うことができる。
【0016】
図7は、本発明の第4実施形態に係る柱補強構造10Cを示したものである。この実施形態では、既設鉄筋コンクリート柱1Cが円柱形状になっている。これに合わせて、補強板11Cは、円弧状に湾曲されて柱1の周面に当てられている。押当て部材30の本体部31Cは、円弧状に湾曲され、隣り合う補強板11Cの端部間に跨るようにしてこれら補強板11Cの外側面に当てられている。この本体部31Cの幅方向寸法等は、直線状のタイロッド20が補強板11Cに干渉しないように設定されている。
【0017】
図8は、引張り手段の変形例に係る実施形態を示したものである。この実施形態では、上記第1実施形態と同様の異形鋼棒からなるタイロッド20が用いられている。第1実施形態と異なるところは、スリーブ21に代えて、タイロッド20の端部をネジ切り加工することにより雄ネジ20aが刻設されている点である。この雄ネジ20aにダブルナット23が強くねじ込まれることにより、タイロッド20に引張り力が付与されている。
【0018】
図9は、引張り手段の他の変形例に係る実施形態を示したものである。この実施形態では、タイロッド20Xとして、異形鋼棒に代えて、外周に圧延雄ネジ20bを有するネジ鉄筋が用いらている。このタイロッド20Xの端部が、押当て部材30の定着部32の挿通孔32aに挿通されている。この端部の雄ネジ20bにダブルナット24が強くねじ込まれることにより、タイロッド20Xに引張り力が付与されている。
【0019】
本発明は、柱の補強だけでなく、梁の補強にも適用できる。すなわち、図10は、本発明を鉄筋コンクリート梁3に適用した補強構造10Dを示したものである。梁3は、図10において紙面と直交する水平方向に延びるとともに、鉄筋コンクリートからなる床スラブ4と一体に連なっている。梁3と床スラブ4の上面どうしは面一になっている。梁3のスラブ下部分の左右側面に、それぞれ補強板11Sが添えられている。各補強板11Sの床スラブ4側の上端部は、ジベル40によって柱1Bに定着されている。補強板11Sの床スラブ4とは逆側の下端部は、直角に折曲されている。この折曲部11aが、梁3の下面に当てられた補強板1に重ねられている。さらに、折曲部11aに押当て部材30が被せられている。梁3の左右の床スラブ4には、それぞれ貫通孔4aが形成され、この貫通孔4aに垂直をなすタイロッド20が通されている。このタイロッド20の上端部が、床スラブ4の上面にワッシャープレート50を介してダブルナット23で緊締、定着されている。これによって、床スラブ付きの梁4であっても確実に補強を行うことができる。
【0020】
本発明は、上記の実施形態に制約されるものでなく、種々の形態を採用することができる。
例えば、構造体の長手方向に隣り合う押当て部材どうしが、一体に連なっていてもよい。
【0021】
【発明の効果】
以上説明したように、本発明によれば、溶接やグラウト剤の注入作業をしなくても補強板を柱等の構造体に簡単に拘束することができる。しかも、コンクリートを締め付けて強度を増大させることができる。これによって、簡単な施工で効率的に構造体を補強できる。さらに、壁や床スラブと一体になった柱や梁にも適用することができる。
【図面の簡単な説明】
【図1】本発明の第1実施形態に係る補強構造が施された既設鉄筋コンクリート柱の正面図である。
【図2】図1のII−II線に沿う上記柱の断面図である。
【図3】上記柱補強構造の板拘束装置の斜視図である。
【図4】図1のIV−IV線に沿う上記柱補強構造の拡大断面図である。
【図5】本発明の第2実施形態に係る補強構造が施された既設鉄筋コンクリート柱の断面図である。
【図6】本発明の第3実施形態に係る補強構造が施された既設鉄筋コンクリート柱の断面図である。
【図7】本発明の第4実施形態に係る補強構造が施された既設鉄筋コンクリート柱の断面図である。
【図8】柱補強構造の引張り手段の変形例を示す拡大断面図である。
【図9】柱補強構造の引張り手段の他の変形例を示す拡大断面図である。
【図10】本発明を床スラブと一体の梁に適用した実施形態を示し、梁と直交する方向から見た断面図である。
【符号の説明】
1,1C 既設鉄筋コンクリート柱(構造体)
2 袖壁
2a 貫通孔
3 既設鉄筋コンクリート梁(構造体)
4 床スラブ
4a 貫通孔
10,10A,10B,10C 柱補強構造
10D 梁補強構造
11,11C,11S 補強板
11a 引掛部
12 板拘束装置
20,20X タイロッド(棒部材)
20a,20b 雄ネジ
21 スリーブ(ナット部材)
21a 雌ネジ
22 ボルト
23,24 ダブルナット
30 押当て部材
31,31C 本体部
32 定着部
32a 挿通孔
40 ジベル
50 ワッシャープレート
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure in which existing structures such as reinforced concrete columns and beams are reinforced to improve earthquake resistance and the like.
[0002]
[Prior art]
As a seismic reinforcement method for existing reinforced concrete columns, the columns are wound with steel plates, the ends of adjacent steel plates are welded in the circumferential direction of the column, and a grout agent such as non-shrink mortar is filled between the steel plates and the columns. Is being done. A means for winding a fiber sheet around a column and fixing it with a resin (adhesive) is also known.
[0003]
[Problems to be solved by the invention]
In the steel sheet winding method, not only the work such as welding and filling with grout agent is complicated, but also the thickness of the steel sheet has to be increased to withstand the pressure of the grout, the weight is increased, and the installation work is also difficult. There was a problem that it was time consuming and expensive. Even in the fiber sheet winding method, the sheet must be wound several times or a resin must be applied, which is complicated. In addition, any method cannot be applied to a column with a wall and a beam integrated with a floor slab.
The present invention has been made in view of the above circumstances, and the object of the present invention is to efficiently reinforce existing reinforced concrete structures such as columns and beams with simple construction, and also to structures integrated with slabs. The object is to provide an applicable reinforcing structure.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a reinforcing structure according to the present invention includes a plurality of reinforcing plates surrounding existing reinforced concrete structures such as columns and beams, and a plate restraining device that restrains these reinforcing plates to the structure. A plate restraining device connects a plurality of bar members surrounding the reinforcing plate around the structure and two adjacent bar members in a tensioned state, and is pressed against the outer surface of the reinforcing plate by the tensile force. And a pressing member that presses and restrains the reinforcing plate against the peripheral surface of the structure. This makes it possible to easily restrain the reinforcing plate to the structure without performing welding or grouting agent injection. Moreover, the concrete can be tightened to increase the strength by pressing the reinforcing plate against the structure with the restraining device. Thereby, the structure can be efficiently reinforced by simple construction. In addition, since the reinforcing plate does not need to withstand the internal pressure due to the grout agent, the reinforcing plate can be made thin, and consequently lighter, and the construction can be further facilitated.
[0005]
Here, the pressing member has a main body portion to be applied to the reinforcing plate, and fixing portions provided at both end portions along the enclosing direction of the main body portion, and the end of the rod member is provided in the fixing portion. It is desirable that the portions are connected in a state of being pulled by bolting. This makes it possible to reliably apply a tensile force with a simple configuration. A bolt may be formed by forming a male screw at the end of the bar member, and a nut may be screwed into the bolt. Alternatively, a nut member may be fixed to the end of the bar member, and the bolt may be screwed into the nut member.
[0006]
It is desirable that the pressing member straddles between end portions of the reinforcing plates adjacent to each other in the enclosing direction. Accordingly, two reinforcing plates can be pressed by one pressing member, and both ends of each reinforcing plate can be pressed and restrained by the pressing member.
[0007]
When the structure is a column and a reinforced concrete wall is integrally connected to the column, it is desirable to form a through hole in the wall and pass the bar member through the through hole. When the structure is a beam and a reinforced concrete floor slab is integrally connected to the beam, it is desirable to form a through hole in the floor slab and pass the bar member through the through hole. Thereby, the said reinforcement structure is applicable also to a pillar with a wall and a beam with a floor slab. In these pillars with walls and beams with floor slabs, reinforcing plates are arranged on both sides of the walls and floor slabs, and rod members that penetrate the walls and floor slabs are straddled between the reinforcing plates on both sides. Also good. If the wall or floor slab and one side of the column or beam are flush with each other, one end of the bar member that penetrates the wall or floor slab may be fixed on the same side. Good. A reinforcing plate may not be provided on one side of the surface. Thus, in the structure integrated with the wall or floor slab, a part thereof is surrounded by the reinforcing plate.
[0008]
When the column has a prismatic shape, the rod member is disposed for each side surface of the structure, and the pressing member is disposed for each corner of the structure and bends to the same angle as the corner. It is desirable. Thereby, construction can be performed more easily. The reinforcing plate may be disposed for each side surface of the structure, or may be disposed for each corner of the structure and bent at the same angle as the corner. When the reinforcing plate is arranged for each side surface of the structure, the pressing member straddles between the reinforcing plates on the two side surfaces of the structure. In this case, one end portion of each reinforcing plate may be bent at the same angle as the corner of the structure, overlapped on the outer surface of the adjacent reinforcing plate, and a pressing member may be covered on the outer side. Thereby, the reinforcing plate can be more reliably restrained to the structure. In the case where the reinforcing plate is arranged for each corner of the structure, both ends of the reinforcing plate are positioned substantially at the center of the side surface of the structure, thereby, in the central portion of each side surface of the structure, It is desirable that the ends of two adjacent reinforcing plates be opposed to each other. And the contact part which each hits the edge part of the said 2 reinforcement board is provided in the intermediate part of the bar member distribute | arranged for every side of the structure, and the said contact part is an edge part of a reinforcement board with the said tension | pulling It is desirable to press against the side of the structure.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of the present invention, in which a column reinforcing structure 10 is constructed around a square column-shaped existing reinforced concrete column 1 (structure). The column reinforcing structure 10 includes a flat steel reinforcing plate 11 that is in direct contact with the four side surfaces of the column 1 and a reinforcing plate restraining device 12 that forms a ring as a whole and surrounds the reinforcing plate 11. ing. Each reinforcing plate 11 extends vertically along the pillar 1. The width of the reinforcing plate 11 is substantially the same as the width of the side surface of the column 1 to be attached. Thereby, the entire circumference of the pillar 1 is surrounded by the reinforcing plate 11. In addition, since it is easy to receive stress in the upper and lower ends of the column 1 at the time of an earthquake, the reinforcing structure 10 may be installed only on the upper side and the lower side of the column 1.
[0010]
A plurality of restraining devices 12 are arranged apart in the height direction of the pillar 1. Each restraining device 12 includes four pressing members 30 and four tie rods (bar members) 20. The four pressing members 30 are respectively arranged at the four corners of the column 1. These pressing members 30 are made of a steel material, and are folded at a right angle to form an L-shaped main body portion 31 and a pair of fixing members provided so as to protrude at right angles from the ends of each piece of the main body portion 31. Part 32. The L-shaped main body 31 is straddled between the end portions of the two reinforcing plates 11 adjacent to each other with the corners of the pillars 1 therebetween, and is applied to the outer side surfaces of these reinforcing plates 11. The pressing member 30 may be provided with reinforcing ribs and ridges.
[0011]
The four tie rods 20 are respectively arranged on the four side surfaces of the pillar 1. These tie rods 20 are formed of deformed steel bars extending linearly. As shown in FIGS. 3 and 4, steel sleeves (nut members) 21 coaxial with the tie rod 20 are connected to both ends of the tie rod 20 by pressure bonding. A female screw 21 a is formed on the inner peripheral surface of the sleeve 21. As shown in FIGS. 1 and 2, the total length of the tie rod 20 and the sleeves 21 at both ends thereof is shorter than the width of the reinforcing plate 11.
[0012]
Each tie rod 20 extends horizontally along the outer surface of the reinforcing plate 11, and is bridged between the pressing members 30 (at the two corners of the column 1) at both ends of the reinforcing plate 11. In this state, the sleeves 21 at both ends of the tie rod 20 face each other in the vicinity of the fixing portion 32 of the pressing member 30. Then, a bolt 22 is passed through an insertion hole 32 a formed in the fixing unit 32, and the bolt 22 is strongly screwed into the female screw 21 a of the sleeve 21. As a result, a tensile force is applied to the tie rod 20. By this tensile force, the pressing members 30 at both ends of the tie rod 20 are urged in a direction in which they approach each other. As a result, the four pressing members 30 are urged toward each other, thereby pressing the reinforcing plate 11 against the column 1. In this way, the reinforcing plate 11 is restrained to the column 1 by the restraining device 12. As a result, the pillar 1 is tightened and the earthquake resistance is enhanced. According to the inventor's experiment, the maximum load of shear fracture resistance was increased by 1.22 times that before reinforcement.
[0013]
According to the reinforcing structure 10 described above, the reinforcing plate 11 can be bound and restrained from the outside, and it is not necessary to perform a connecting operation such as welding of the reinforcing plates 11, and it is not necessary to inject a grout agent. Thereby, the pillar 1 can be efficiently reinforced by simple construction, and the construction cost can be greatly reduced. Further, the reinforcing plate 11 is bound from the outside and does not need to withstand the internal pressure due to the grout agent, so that it can be made thin and light, and the construction can be further facilitated. Moreover, since the reinforcing plate 11 is pressed against the column 1 with a surface, the tightening force of the restraining device 12 can be transmitted to the column 1 over a wide range. Therefore, the space | interval of the restraining apparatus 12 adjacent to the upper and lower sides can be separated rather than the case where there is no reinforcement board 11. FIG. Thereby, the number of installation of the restraint device 12 can be reduced, and the construction can be made more efficient.
[0014]
Next, another embodiment of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for the same configurations as those of the above-described embodiments, and the description thereof is omitted.
FIG. 5 shows a column reinforcing structure 10A according to the second embodiment of the present invention. In this embodiment, one end portion along the column circumferential direction of each reinforcing plate 11 is bent at a right angle. The bent portion 11a is overlapped with the outer side surface of the reinforcing plate 11 on the adjacent side surface. The pressing member 30 is put on the outside of the bent portion 11a. According to this embodiment, displacement of the reinforcing plate 11 can be prevented, and the reinforcing plate 11 can be pressed down twice, and can be restrained more reliably. Further, positioning and the like are facilitated when the reinforcing plate 11 is installed, and the construction can be further facilitated.
[0015]
The reinforcing structure of the present invention can also be applied to a walled column. That is, as shown in FIG. 6, in the column reinforcing structure 10B according to the third embodiment of the present invention, the reinforced concrete sleeve walls 2 are integrally connected to the left and right sides of the reinforced concrete column 1B. Narrow reinforcing plates 11S are attached to the left and right sides of the front and rear columns 1B across the sleeve wall 2, respectively. The end of each reinforcing plate 11S on the sleeve wall 2 side is fixed to the column 1B by a dowel 40 (reinforcing plate end fixing member). The end of the reinforcing plate 11S opposite to the sleeve wall 2 is bent at a right angle. This bent portion 11a is overlapped on the outer side of the reinforcing plate 1 disposed on the front and back sides of the pillar 1B. Furthermore, the pressing member 30 is put on the outside of the bent portion 11a. A through hole 2a is formed in each of the left and right sleeve walls 2, and a tie rod 20 is passed through the through hole 2a. The tie rod 20 straddles between the reinforcing plates 11S on the front and rear sides with the sleeve wall 2 interposed therebetween. Thereby, even if it is pillar 1B with a wall, reinforcement can be performed reliably.
[0016]
FIG. 7 shows a column reinforcing structure 10C according to a fourth embodiment of the present invention. In this embodiment, the existing reinforced concrete pillar 1C has a cylindrical shape. In accordance with this, the reinforcing plate 11C is curved in an arc shape and applied to the peripheral surface of the column 1. The main body portion 31C of the pressing member 30 is curved in an arc shape and is applied to the outer surface of these reinforcing plates 11C so as to straddle between the end portions of the adjacent reinforcing plates 11C. The width direction dimension and the like of the main body 31C is set so that the linear tie rod 20 does not interfere with the reinforcing plate 11C.
[0017]
FIG. 8 shows an embodiment according to a modification of the pulling means. In this embodiment, a tie rod 20 made of a deformed steel bar similar to that in the first embodiment is used. The difference from the first embodiment is that, instead of the sleeve 21, a male screw 20 a is engraved by threading the end of the tie rod 20. A tensile force is applied to the tie rod 20 by strongly screwing the double nut 23 into the male screw 20a.
[0018]
FIG. 9 shows an embodiment according to another modification of the pulling means. In this embodiment, as the tie rod 20X, a screw rebar having a rolled male screw 20b on the outer periphery is used instead of the deformed steel bar. The end portion of the tie rod 20X is inserted into the insertion hole 32a of the fixing portion 32 of the pressing member 30. A tensile force is applied to the tie rod 20X by the double nut 24 being strongly screwed into the male screw 20b at the end.
[0019]
The present invention can be applied not only to column reinforcement but also beam reinforcement. That is, FIG. 10 shows a reinforcing structure 10D in which the present invention is applied to a reinforced concrete beam 3. The beam 3 extends in a horizontal direction perpendicular to the paper surface in FIG. 10 and is continuous with a floor slab 4 made of reinforced concrete. The upper surfaces of the beam 3 and the floor slab 4 are flush with each other. Reinforcing plates 11S are attached to the left and right side surfaces of the lower part of the slab of the beam 3, respectively. The upper end portion of each reinforcing plate 11S on the floor slab 4 side is fixed to the column 1B by a dowel 40. The lower end of the reinforcing plate 11S opposite to the floor slab 4 is bent at a right angle. The bent portion 11 a is overlaid on the reinforcing plate 1 applied to the lower surface of the beam 3. Further, the pressing member 30 is put on the bent portion 11a. Through holes 4a are formed in the left and right floor slabs 4 of the beam 3, and tie rods 20 perpendicular to the through holes 4a are passed therethrough. The upper end portion of the tie rod 20 is fastened and fixed to the upper surface of the floor slab 4 with a double nut 23 via a washer plate 50. Thereby, even the beam 4 with a floor slab can be reliably reinforced.
[0020]
The present invention is not limited to the above-described embodiment, and various forms can be adopted.
For example, the pressing members adjacent to each other in the longitudinal direction of the structure may be integrally connected.
[0021]
【The invention's effect】
As described above, according to the present invention, the reinforcing plate can be easily constrained to a structure such as a column without performing welding or grouting agent injection. Moreover, the concrete can be tightened to increase the strength. Thereby, the structure can be efficiently reinforced by simple construction. Furthermore, the present invention can also be applied to columns and beams integrated with walls and floor slabs.
[Brief description of the drawings]
FIG. 1 is a front view of an existing reinforced concrete column provided with a reinforcing structure according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the column taken along line II-II in FIG.
FIG. 3 is a perspective view of a plate restraining device having the column reinforcing structure.
4 is an enlarged cross-sectional view of the column reinforcing structure taken along line IV-IV in FIG. 1;
FIG. 5 is a cross-sectional view of an existing reinforced concrete column provided with a reinforcing structure according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view of an existing reinforced concrete column provided with a reinforcing structure according to a third embodiment of the present invention.
FIG. 7 is a cross-sectional view of an existing reinforced concrete column provided with a reinforcing structure according to a fourth embodiment of the present invention.
FIG. 8 is an enlarged cross-sectional view showing a modification of the tension means of the column reinforcing structure.
FIG. 9 is an enlarged cross-sectional view showing another modification of the tension means of the column reinforcing structure.
FIG. 10 is a cross-sectional view showing an embodiment in which the present invention is applied to a beam integrated with a floor slab and viewed from a direction orthogonal to the beam.
[Explanation of symbols]
1,1C Existing reinforced concrete columns (structure)
2 Sleeve wall 2a Through hole 3 Existing reinforced concrete beam (structure)
4 Floor slab 4a Through hole 10, 10A, 10B, 10C Column reinforcement structure 10D Beam reinforcement structure 11, 11C, 11S Reinforcement plate 11a Hook 12 Plate restraint device 20, 20X Tie rod (bar member)
20a, 20b Male thread 21 Sleeve (nut member)
21a Female screw 22 Bolts 23, 24 Double nut 30 Pushing member 31, 31C Main body 32 Fixing portion 32a Insertion hole 40 Gibel 50 Washer plate

Claims (6)

既設鉄筋コンクリート構造体を囲む複数の補強板と、これら補強板を上記構造体に拘束する板拘束装置とを備え、この板拘束装置が、上記構造体の周りの補強板を囲む複数の棒部材と、隣り合う2つの棒部材を引張り状態で連結するとともにその引張り力によって上記補強板の外側面に押し当てられ、ひいては補強板を上記構造体の周面に押し当てて拘束する押し当て部材とを有していることを特徴とする既設鉄筋コンクリート構造体の補強構造。A plurality of reinforcing plates surrounding an existing reinforced concrete structure, and a plate restraining device for restraining the reinforcing plates to the structure, and the plate restraining device includes a plurality of bar members surrounding the reinforcing plates around the structure; A pressing member that connects two adjacent rod members in a tensioned state and is pressed against the outer surface of the reinforcing plate by the tensile force, thereby pressing the reinforcing plate against the peripheral surface of the structure. A reinforcing structure for an existing reinforced concrete structure, characterized by comprising: 上記押当て部材が、上記補強板に当てられる本体部と、この本体部の上記囲み方向に沿う両端部に設けられた定着部とを有し、この定着部に上記棒部材の端部がボルト締めにより引張られた状態で連結されていることを特徴とする請求項1に記載の既設鉄筋コンクリート構造体の補強構造。The pressing member has a main body portion to be applied to the reinforcing plate, and fixing portions provided at both end portions along the enclosing direction of the main body portion, and the end portion of the bar member is bolted to the fixing portion. The reinforcing structure for an existing reinforced concrete structure according to claim 1, wherein the reinforcing structure is connected in a state of being pulled by tightening. 上記押当て部材が、上記囲み方向に隣り合う補強板の端部間に跨っていることを特徴とする請求項1又は2に記載の既設鉄筋コンクリート構造体の補強構造。The reinforcing structure for an existing reinforced concrete structure according to claim 1 or 2, wherein the pressing member straddles between end portions of reinforcing plates adjacent to each other in the enclosing direction. 上記構造体が角柱形状をなしており、上記補強板とその外側の棒部材とが、上記構造体の側面ごとに配され、上記押当て部材が、上記構造体の2つの側面で作る角と同角に折れてこれら2つの側面の補強板間に跨っていることを特徴とする請求項1〜3の何れかに記載の既設鉄筋コンクリート構造体の補強構造。The structure has a prismatic shape, the reinforcing plate and the rod member outside the reinforcing plate are arranged on each side of the structure, and the pressing member forms an angle formed on two sides of the structure. The reinforcing structure for an existing reinforced concrete structure according to any one of claims 1 to 3, wherein the reinforcing structure is folded at the same angle and straddles between the reinforcing plates on the two side surfaces. 上記構造体が柱であり、この柱に鉄筋コンクリートの壁が一体に連なっており、この壁に貫通孔が形成され、この貫通孔に上記棒部材が通されていることを特徴とする請求項1〜4の何れかに記載の既設鉄筋コンクリート構造体の補強構造。2. The structure according to claim 1, wherein the structural body is a column, a wall of reinforced concrete is integrally connected to the column, a through hole is formed in the wall, and the bar member is passed through the through hole. The reinforcement structure of the existing reinforced concrete structure in any one of -4. 上記構造体が梁であり、この梁に鉄筋コンクリートの床スラブが一体に連なっており、この床スラブに貫通孔が形成され、この貫通孔に上記棒部材が通されていることを特徴とする請求項1〜4の何れかに記載の既設鉄筋コンクリート構造体の補強構造。The structure is a beam, a reinforced concrete floor slab is integrally connected to the beam, a through hole is formed in the floor slab, and the bar member is passed through the through hole. Item 5. A reinforcing structure for an existing reinforced concrete structure according to any one of Items 1 to 4.
JP2002187740A 2002-06-27 2002-06-27 Reinforcement structure of existing reinforced concrete structure Pending JP2004027714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002187740A JP2004027714A (en) 2002-06-27 2002-06-27 Reinforcement structure of existing reinforced concrete structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002187740A JP2004027714A (en) 2002-06-27 2002-06-27 Reinforcement structure of existing reinforced concrete structure

Publications (1)

Publication Number Publication Date
JP2004027714A true JP2004027714A (en) 2004-01-29

Family

ID=31182678

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002187740A Pending JP2004027714A (en) 2002-06-27 2002-06-27 Reinforcement structure of existing reinforced concrete structure

Country Status (1)

Country Link
JP (1) JP2004027714A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005023745A (en) * 2003-07-03 2005-01-27 Faibekkusu Kk Reinforcing structure of reinforced concrete column, and reinforcing material for use in the same
JP2012127130A (en) * 2010-12-16 2012-07-05 Hideyuki Abe Timbering apparatus
JP2017002713A (en) * 2016-08-02 2017-01-05 株式会社サンヨーホーム Column reinforcement method and column reinforcement structure
RU172319U1 (en) * 2016-12-26 2017-07-04 Максим Владимирович Мосин DEVICE FOR STRENGTHENING CONSTRUCTION STRUCTURES
CN107191005A (en) * 2017-07-05 2017-09-22 北京筑福国际抗震技术有限责任公司 It is a kind of to use the angle steel rest reinforcing masonry structure periodically fastened and its construction method
US10612253B2 (en) 2015-06-09 2020-04-07 Sanyohome Co., Ltd. Construction method for reinforcing a column and reinforcing structure for a column
CN114809693A (en) * 2022-03-21 2022-07-29 重庆科技学院 High-load self-restraint reinforcing device for existing reinforced concrete column

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005023745A (en) * 2003-07-03 2005-01-27 Faibekkusu Kk Reinforcing structure of reinforced concrete column, and reinforcing material for use in the same
JP2012127130A (en) * 2010-12-16 2012-07-05 Hideyuki Abe Timbering apparatus
US10612253B2 (en) 2015-06-09 2020-04-07 Sanyohome Co., Ltd. Construction method for reinforcing a column and reinforcing structure for a column
JP2017002713A (en) * 2016-08-02 2017-01-05 株式会社サンヨーホーム Column reinforcement method and column reinforcement structure
RU172319U1 (en) * 2016-12-26 2017-07-04 Максим Владимирович Мосин DEVICE FOR STRENGTHENING CONSTRUCTION STRUCTURES
CN107191005A (en) * 2017-07-05 2017-09-22 北京筑福国际抗震技术有限责任公司 It is a kind of to use the angle steel rest reinforcing masonry structure periodically fastened and its construction method
CN114809693A (en) * 2022-03-21 2022-07-29 重庆科技学院 High-load self-restraint reinforcing device for existing reinforced concrete column

Similar Documents

Publication Publication Date Title
KR102012486B1 (en) A earthquake proof reinforcement structure possible to install on pilotis construction variably and construction method using the same
US8632279B2 (en) Splice for a soil reinforcing element or connector
JP5440945B2 (en) Joining structure and method of shaft member and RC member
JP2004027714A (en) Reinforcement structure of existing reinforced concrete structure
JP2009281066A (en) Building structure using composite structural beam having pc structure on its ends
JP3834637B2 (en) Permanent and emergency seismic reinforcement method for wall columns
JP2000204657A (en) Column-to-beam joint structure
JP2012127130A (en) Timbering apparatus
JP4632566B2 (en) Column and beam end joining method
JP2000096834A (en) Reinforcing structure of concrete member
KR101518034B1 (en) manufacturing method for concrete column having self-restraint features
JP2018188902A (en) Joint structure of structure skeleton for wooden building and wooden building
US20050120657A1 (en) Form system wall tie and methods for making and using the same
JP2667134B2 (en) Reinforcement method for columnar structures
JP5711035B2 (en) Anchor and anchor fixing method
JP2009270432A (en) Construction method of steel frame exposed column base structure
JP5169645B2 (en) Reinforced column finishing method, reinforced column finishing material mounting structure, column reinforcement method
US20120114430A1 (en) Splice for a soil reinforcing element or connector
JP4865104B2 (en) Design method for composite structural beams
JP4348258B2 (en) Wall reinforcing method and reinforcing structure
KR20130053172A (en) Connection structure for concrete filled tubular column and flatplate
JP2011032724A (en) Column leg structure
JP2788989B2 (en) Formwork assembling tool and formwork assembling method
JP2660902B2 (en) Method of forming mold for concrete and fastener used therefor
JP6263145B2 (en) Shear strength improvement structure and construction method