JPH0656061B2 - Seismic retrofitting method for existing columns - Google Patents
Seismic retrofitting method for existing columnsInfo
- Publication number
- JPH0656061B2 JPH0656061B2 JP63228489A JP22848988A JPH0656061B2 JP H0656061 B2 JPH0656061 B2 JP H0656061B2 JP 63228489 A JP63228489 A JP 63228489A JP 22848988 A JP22848988 A JP 22848988A JP H0656061 B2 JPH0656061 B2 JP H0656061B2
- Authority
- JP
- Japan
- Prior art keywords
- carbon fiber
- existing
- existing column
- covering material
- pillar
- 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.)
- Expired - Lifetime
Links
Landscapes
- Working Measures On Existing Buildindgs (AREA)
Description
【発明の詳細な説明】 《産業上の利用分野》 本発明は、既存構造物のコンクリート製柱部材の耐震補
強方法の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to an improvement in a seismic retrofitting method for a concrete column member of an existing structure.
《従来の技術》 従来、既存柱の補強方法において、既存構造物の柱部材
に高強度炭素長繊維ストランドをスパイラル状に捲回し
た後、この長繊維ストランドを埋め込むようにして仕上
材を施工する方法が知られている（特開昭６１−１５１
３７１号）。<< Conventional Technology >> Conventionally, in a method of reinforcing an existing column, a high-strength carbon long fiber strand is spirally wound around a column member of an existing structure, and then a finishing material is installed by embedding the long fiber strand. A method is known (Japanese Patent Laid-Open No. 61-151).
371).
この方法は柱部材の強度と靱性を改善して構造物を補強
するとともに、施工に際して高い熟練度が不要であっ
て、しかも施工精度の確保が容易に行なえ、さらに維持
管理の容易化が期待できるものである。This method improves the strength and toughness of the pillar members and reinforces the structure, does not require a high degree of skill in construction, can easily secure the construction accuracy, and can be expected to facilitate maintenance. It is a thing.
《発明が解決しようとする課題》 しかし、この既存柱に炭素繊維を捲回して補強する場
合、第６図（イ）に示すようにその既存柱１の隈角部分
３のエッジ６で炭素繊維ストランドは極端に曲げられて
その形状が変わるので、その結果炭素繊維９はエッジ６
で切れ易いという問題があった。<< Problems to be Solved by the Invention >> However, when carbon fiber is wound around this existing column to reinforce it, as shown in FIG. 6 (a), the carbon fiber is applied at the edge 6 of the angled portion 3 of the existing column 1. The strands are extremely bent and change their shape, so that the carbon fibers 9 are
There was a problem that it was easy to cut.
このような難点を除去するために、既存柱の隈角部に丸
味をつけなければならないが、斫，左官等が必要である
と共に、工程，工種が多く、また、曲面整形の管理等も
あって施工管理し難い。In order to eliminate such difficulties, the corners of the existing columns must be rounded, but it requires squeezing, plastering, etc., as well as many processes and types of work, and management of curved surface shaping. Construction management is difficult.
また、第６図（ロ）に示すように、既存柱１の隅主筋１
１位置に付着ひび割れ１２が入った場合には、既存柱１
の表面へ成長したひび割れエッジ１３で、炭素繊維スト
ランドが破断するおそれもある。In addition, as shown in FIG. 6 (b), the corner main bar 1 of the existing pillar 1
If there is an attached crack 12 at position 1, the existing pillar 1
The carbon fiber strand may be broken at the crack edge 13 that has grown to the surface of the carbon fiber.
本発明は、これらの諸問題を解決するために創案された
もので、既存柱に捲回する炭素繊維の切断を防止する隅
角部の湾曲面を簡易に得ることのできる新規な既存柱の
耐震補強方法を提供することを目的とする。The present invention was devised in order to solve these various problems, and a new existing column that can easily obtain a curved surface of a corner portion that prevents cutting of carbon fiber wound on the existing column is obtained. The purpose is to provide a seismic retrofit method.
《課題を解決するための手段》 上記目的を達成するために、本発明は、既存柱に炭素繊
維を巻き付けて補強する際に、既存柱の隅角部を被覆材
で被覆し、その後被覆材の上から炭素繊維を巻き付ける
ようにしたものである。<< Means for Solving the Problem >> In order to achieve the above object, the present invention, when winding and reinforcing carbon fiber around an existing column, covers the corners of the existing column with a coating material, and then the coating material. The carbon fiber is wound from above.
《作用》 既存柱の隅角部を覆う被覆材により、既存柱の隅角部に
容易かつ迅速に、湾曲面が形成され、この湾曲面を介し
て既存柱に炭素繊維を巻き付けるから、隅角部における
炭素繊維ストランドの巻付け形状を緩やかなものとする
ことができ、その炭素繊維の切断が抑止される。<Operation> The covering material that covers the corners of the existing columns forms a curved surface on the corners of the existing columns easily and quickly, and the carbon fiber is wound around the existing columns through the curved surface. The winding shape of the carbon fiber strand in the portion can be made gentle, and the cutting of the carbon fiber is suppressed.
《実施例》 以下、本発明の好適な実施例を図面を参照しながら詳述
する。なお、従来のものと共通する構成要素については
同一符号を使用するものとする。<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the drawings. It should be noted that the same reference numerals are used for the components common to the conventional ones.
第１図及び第２図は、本発明によって補強した既存柱の
一例を示す側面図及び平断面図である。1 and 2 are a side view and a plan sectional view showing an example of an existing column reinforced by the present invention.
図示するように、補強されるべき既存柱１は、その隅角
部３が湾曲形成された被覆材４で被覆され、その上から
炭素繊維９がスパイラル状に捲かれている。As shown in the figure, the existing pillar 1 to be reinforced is covered with a covering material 4 having a curved corner portion 3 and a carbon fiber 9 is spirally wound on the covering material 4.
具体的には、この既存柱１は鉄筋コンクリート柱であ
り、被覆材４は、鋼管またはコンクリート管を４つ割り
にした形状を呈している。Specifically, the existing pillar 1 is a reinforced concrete pillar, and the covering material 4 has a shape obtained by dividing a steel pipe or a concrete pipe into four.
この被覆材４を既存柱１の隅角部３に被覆する作業工程
は、先ず、隅角部３のエッジ６（第５図（イ）参照）を
切り欠き、第３図に示すように、その切り欠き部分７に
モルタル８を適当に塗布し、そのモルタル８の上に４つ
割り状の被覆材４の凹部５を当接させて配設する。In the working process of covering the corner portion 3 of the existing pillar 1 with this covering material 4, first, the edge 6 of the corner portion 3 (see FIG. 5A) is cut out, and as shown in FIG. Mortar 8 is appropriately applied to the cutout portion 7, and the concave portion 5 of the quartered covering material 4 is placed on the mortar 8 so as to abut.
このような作業工程の後、炭素繊維９を巻く。After such working steps, the carbon fiber 9 is wound.
このとき炭素繊維９を既存柱１の周囲にスパイラル状に
捲回すると、その隅角部３以外の外周柱面１０において
は、この炭素繊維９は既存柱１から縁切りされて浮いて
いる。したがって、主筋１１近傍のひび割れ１２のエッ
ジ１３に当ることもない。At this time, when the carbon fiber 9 is spirally wound around the existing pillar 1, the carbon fiber 9 is cut off from the existing pillar 1 and floats on the outer peripheral pillar surface 10 other than the corner portions 3. Therefore, it does not hit the edge 13 of the crack 12 near the main bar 11.
なお、第７図に示す通り、この被覆材４の外半径（曲率
半径）が、３０mmより小さくなると、炭素繊維ストラン
ドの強度が極端に低下することが実験によって明らかに
されている。そこでこの外半径は、３０mm以上とするの
が好ましい。また、被覆材４は、既存柱１の隅角部３に
沿ってその隅角部３のなす中心角以上の中心角で湾曲さ
せて構成しても良い。Note that, as shown in FIG. 7, it has been clarified by experiments that when the outer radius (curvature radius) of the covering material 4 is smaller than 30 mm, the strength of the carbon fiber strand is extremely lowered. Therefore, it is preferable that the outer radius is 30 mm or more. In addition, the covering material 4 may be configured to be curved along the corner portion 3 of the existing pillar 1 at a central angle equal to or larger than the central angle formed by the corner portion 3.
この場合には、隅角部３が若干回転しても、湾曲部分が
９０度以上形成されるので、被覆材４の端部１４が内側
に巻き込まれてそのエッジ１５に炭素繊維９が引っ掛か
らず、浮いている状態を確保することができる。In this case, even if the corner portion 3 is slightly rotated, the curved portion is formed at 90 degrees or more, so that the end portion 14 of the covering material 4 is wound inside and the carbon fiber 9 is not caught on the edge 15. , It is possible to secure the floating state.
上述のいずれの場合でも、炭素繊維９は隅角部３に当接
設置した被覆材４でのみ応力伝達を行ない、平坦なコン
クリート外周柱面１０では何ら作用しないが、この状態
に近い場合でも耐震補強効果があることが確認されてい
る。In any of the above cases, the carbon fiber 9 transmits stress only by the covering material 4 that is installed in contact with the corner portion 3, and does not act on the flat concrete outer peripheral pillar surface 10, but even if it is close to this state, it is seismic resistant. It has been confirmed that it has a reinforcing effect.
また、被覆材４としては、既存柱１の隅角部３に沿って
湾曲自在な可撓性を有する炭素繊維強化プラスチック等
のテープ１６を選定することもできる。Further, as the covering material 4, it is possible to select a tape 16 made of carbon fiber reinforced plastic or the like which has flexibility such that it can be curved along the corner portion 3 of the existing pillar 1.
第５図（イ）乃至第５図（ニ）は、テープ１６の場合の
施工法を示す。5 (a) to 5 (d) show a construction method for the tape 16.
この施工法では、先ず、既存柱１の隅角部３の９０度の
エッジ６を除去し（第５図（イ））、さらに、その隅角
部３の緩やかなエッジ１７をも除去するために、サンダ
ーがけを行う（第５図（ロ））。そしてその部分に炭素
繊維強化プラスチックのテープ１６を貼り付ける（第５
図（ハ））。テープ１６の貼付法は公知の方法による。
その際、あとで、炭素繊維９を捲回するので、気泡が多
少残っていても許されるから、施工は難しくない。好ま
しくは、テープ１６は主筋１１を中心にして生ずる付着
ひび割れ１２をも覆う長さで貼付するのが良い。このよ
うにすれば、付着ひび割れ１２に捲回した炭素繊維９が
直接あたらない。In this construction method, first, the 90-degree edge 6 of the corner portion 3 of the existing pillar 1 is removed (FIG. 5A), and further, the gentle edge 17 of the corner portion 3 is also removed. Then, sander is applied (Fig. 5 (b)). Then, a carbon fiber reinforced plastic tape 16 is attached to that portion (5th embodiment).
Figure (c)). The method of attaching the tape 16 is a known method.
At that time, since the carbon fiber 9 is wound later, even if some air bubbles remain, it is allowed, so that the construction is not difficult. It is preferable that the tape 16 is attached in such a length that it covers the adhesion cracks 12 formed around the main bar 11. By doing so, the carbon fiber 9 wound around the adhesion crack 12 does not directly hit.
最後に、そのテープ１６が貼られている既存柱１に炭素
繊維９を捲回する。Finally, the carbon fiber 9 is wound around the existing pillar 1 to which the tape 16 is attached.
この施工法において、テープ１６は隅角部３に成形され
た湾曲面１８の不備を補うので、所定の曲率に成形する
作業の精度を落としても許される。In this construction method, the tape 16 compensates for the deficiency of the curved surface 18 formed in the corner portion 3, so that it is permissible even if the precision of the operation of forming into a predetermined curvature is reduced.
《発明の効果》 以上述べたように、要するに、本発明に係る既存柱の耐
震補強方法は、既存柱に炭素繊維を巻き付けて補強する
際に、既存柱の隅角部を被覆材で被覆し、その後、被覆
材の上から炭素繊維を巻き付けるようにしたから、次の
効果を発揮する。<Effects of the Invention> As described above, in short, the method for earthquake-proofing an existing column according to the present invention is such that when the carbon fiber is wound around the existing column for reinforcement, the corners of the existing column are covered with a covering material. After that, since the carbon fiber is wound on the covering material, the following effects are exhibited.
炭素繊維が既存柱の隅角部のエッジで切断されること
がない。Carbon fibers are not cut at the corner edges of existing columns.
炭素繊維が付着ひび割れのエッジで切断されることが
ない。Carbon fibers are not cut at the edges of adherent cracks.
既存柱の隅角部にアール部を簡易に整形できるから、
作業が能率よく行える。Since the rounded portion can be easily shaped in the corner of the existing pillar,
Work can be done efficiently.
第１図は本発明によって補強した既存柱の一実施例を示
す側面図、第２図はその平断面図、第３図は第２図Ａ部
拡大図、第４図は第３図に示す被覆材の変形実施例の断
面図、第５図は被覆材にテープを用いた耐震補強方法の
工程の説明図、第６図は従来の補強した既存柱に生ずる
炭素繊維切断現象の説明図、第７図はコーナー部の曲率
半径と引張強度との関係を示すグラフである。 １……既存柱、３……隅角部 ４……被覆材、９……炭素繊維FIG. 1 is a side view showing an embodiment of an existing column reinforced by the present invention, FIG. 2 is a plan sectional view thereof, FIG. 3 is an enlarged view of a portion A of FIG. 2, and FIG. 4 is shown in FIG. FIG. 5 is a cross-sectional view of a modified embodiment of the covering material, FIG. 5 is an explanatory view of steps of a seismic retrofitting method using a tape for the covering material, and FIG. 6 is an explanatory view of a carbon fiber cutting phenomenon occurring in a conventional reinforced existing column FIG. 7 is a graph showing the relationship between the radius of curvature of the corner portion and the tensile strength. 1 ... Existing pillar, 3 ... Corner part 4 ... Covering material, 9 ... Carbon fiber
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 常雄 神奈川県横浜市緑区鴨志田町1000番地 三 菱化成株式会社総合研究所内 (72)発明者 谷木 謙介 神奈川県横浜市緑区鴨志田町1000番地 三 菱化成株式会社総合研究所内 (56)参考文献 特開 昭61−151371（ＪＰ，Ａ) 特開 昭52−89211（ＪＰ，Ａ) 特公 昭53−16214（ＪＰ，Ｂ２) 特公 昭52−610（ＪＰ，Ｂ２) 特公 昭53−42986（ＪＰ，Ｂ２) 特公 昭53−43259（ＪＰ，Ｂ２) 特公 昭55−23983（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneo Tanaka 1000 Kamoshida-cho, Midori-ku, Yokohama-shi, Kanagawa Sanryoh Kasei Co., Ltd. (56) Reference JP-A-61-151371 (JP, A) JP-A-52-89211 (JP, A) JP-B-53-16214 (JP-B2) JP-B-52 -610 (JP, B2) JP 53-42986 (JP, B2) JP 53-43259 (JP, B2) JP 55-23983 (JP, B2)
Claims (3)
に、既存柱の隅角部を被覆材で被覆し、その後被覆材の
上から炭素繊維を巻き付けるようにしたことを特徴とす
る既存柱の耐震補強方法。1. When the carbon fiber is wound around an existing column for reinforcement, the corners of the existing column are covered with a coating material, and then the carbon fiber is wound on the coating material. Seismic reinforcement method for columns.
た鋼板材またはコンクリート材でなることを特徴とする
請求項１記載の既存柱の耐震補強方法。2. The method for seismic retrofitting an existing column according to claim 1, wherein the covering material is a steel plate material or a concrete material curved along the corners of the existing column.
在な可撓性を有するテープでなることを特徴とする請求
項１記載の既存柱の耐震補強方法。3. The seismic retrofitting method for an existing column according to claim 1, wherein the covering material is a flexible tape that can bend along the corners of the existing column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63228489A JPH0656061B2 (en) | 1988-09-14 | 1988-09-14 | Seismic retrofitting method for existing columns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63228489A JPH0656061B2 (en) | 1988-09-14 | 1988-09-14 | Seismic retrofitting method for existing columns |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0280767A JPH0280767A (en) | 1990-03-20 |
| JPH0656061B2 true JPH0656061B2 (en) | 1994-07-27 |
Family
ID=16877264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63228489A Expired - Lifetime JPH0656061B2 (en) | 1988-09-14 | 1988-09-14 | Seismic retrofitting method for existing columns |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0656061B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10148038A (en) * | 1997-12-12 | 1998-06-02 | Okumura Corp | Method and structure for earthquake resistant reinforcing of existing column |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10169211A (en) * | 1996-12-16 | 1998-06-23 | Kumagai Gumi Co Ltd | Column reinforcing structure |
| JP3777524B2 (en) * | 1997-08-04 | 2006-05-24 | 清水建設株式会社 | Reinforced structure of concrete members |
| JP4272781B2 (en) * | 1999-11-25 | 2009-06-03 | 東日本旅客鉄道株式会社 | Seismic reinforcement method |
| KR101086853B1 (en) * | 2011-09-02 | 2011-11-25 | 계명대학교 산학협력단 | Structure for strengthening of building column structures |
| JP7162988B2 (en) * | 2019-01-29 | 2022-10-31 | 西松建設株式会社 | Crack control method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52610A (en) * | 1975-06-19 | 1977-01-06 | Nippon Beet Sugar Mfg | Transplanting method of soillstick seedling and apparatus therof |
| JPS5289211A (en) * | 1976-01-20 | 1977-07-26 | Shinko Wire Co Ltd | Construction of reinforced concrete pillar for vibration proof reinforcement |
| GB1517631A (en) * | 1976-07-29 | 1978-07-12 | Eaton Ltd | Lift trucks |
| JPS5342986A (en) * | 1976-09-28 | 1978-04-18 | Nippon Flute Co Ltd | Method of forming board material for corrugated cardboard product |
| JPS5343259A (en) * | 1976-09-30 | 1978-04-19 | Matsushita Electric Ind Co Ltd | High frequency heater |
| JPS5846282B2 (en) * | 1978-08-10 | 1983-10-15 | 株式会社クボタ | Reaping machine for wet fields |
| JPS61151371A (en) * | 1984-12-26 | 1986-07-10 | 株式会社大林組 | Reinforcement of existing pillar |
-
1988
- 1988-09-14 JP JP63228489A patent/JPH0656061B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10148038A (en) * | 1997-12-12 | 1998-06-02 | Okumura Corp | Method and structure for earthquake resistant reinforcing of existing column |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0280767A (en) | 1990-03-20 |
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