JPH0477104B2 - - Google Patents
Info
- Publication number
- JPH0477104B2 JPH0477104B2 JP62261761A JP26176187A JPH0477104B2 JP H0477104 B2 JPH0477104 B2 JP H0477104B2 JP 62261761 A JP62261761 A JP 62261761A JP 26176187 A JP26176187 A JP 26176187A JP H0477104 B2 JPH0477104 B2 JP H0477104B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- strength long
- strength
- long fibers
- section
- 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
- 239000000835 fiber Substances 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 23
- 239000000853 adhesive Substances 0.000 claims description 14
- 230000001070 adhesive effect Effects 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 14
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 14
- 239000004917 carbon fiber Substances 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000005452 bending Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Landscapes
- Rod-Shaped Construction Members (AREA)
- Working Measures On Existing Buildindgs (AREA)
Description
【発明の詳細な説明】
《産業上の利用分野》
本発明はシート状繊維を用いた梁の補強方法に
関する。DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a method for reinforcing a beam using sheet-like fibers.
《従来の技術》
既存の構造物における梁の補強方法としては既
に各種の方法が提案され実施されている。ところ
で、近年の高強度長繊維の急速な開発、実用化に
ともない、建築分野においてもこのような繊維を
応用する試みがなされており、例えば梁の補強方
法においては第３図に示す如く既存の梁１の下面
に梁１の軸線方向に沿つてシート状炭素繊維２を
取付けることが提案されている。このように梁１
の下面にシート状炭素繊維２を取付けると、梁１
の特に曲げ強度を増大させることができる。<<Prior Art>> Various methods have already been proposed and implemented as methods for reinforcing beams in existing structures. By the way, with the rapid development and practical use of high-strength long fibers in recent years, attempts have been made to apply such fibers in the construction field. It has been proposed to attach a sheet-like carbon fiber 2 to the lower surface of the beam 1 along the axial direction of the beam 1. Beam 1 like this
When sheet-like carbon fiber 2 is attached to the bottom surface of beam 1,
In particular, the bending strength can be increased.
梁１の下面に対するシート状炭素繊維２の取付
方法としては、現在のことろ第４図〜第６図に示
す３つの方法が検討されている。まず第４図は２
本のボルト３によつてシート状炭素繊維２を直接
梁１の下面に取付ける方法である。次に第５図は
ボルト３とシート状炭素繊維２との間に押え板４
を挟んで取付ける方法である。この方法はボルト
３の周囲のシート状炭素繊維２が破断しにくいの
で第４図に示す取付方法よりも望ましいといえ
る。次に第６図はボルトを用いずに接着剤によつ
てシート状炭素繊維２を梁１の下面に貼付する取
付方法である。この方法は施工が簡単で低コスト
ですむので有力な方法としてその実用化が検討さ
れつつある。 As a method for attaching the sheet-like carbon fiber 2 to the lower surface of the beam 1, three methods shown in FIGS. 4 to 6 are currently being considered. First of all, Figure 4 is 2
This is a method of attaching the sheet-like carbon fiber 2 directly to the lower surface of the beam 1 using bolts 3. Next, FIG. 5 shows a presser plate 4 between the bolt 3 and the sheet-like carbon fiber 2.
This is a method of mounting by sandwiching the This method is more desirable than the attachment method shown in FIG. 4 because the sheet-like carbon fibers 2 around the bolts 3 are less likely to break. Next, FIG. 6 shows a method of attaching the sheet-like carbon fiber 2 to the lower surface of the beam 1 with an adhesive without using bolts. Since this method is easy to construct and requires low cost, its practical application is being considered as a promising method.
上記３つの取付方法はいずれもシート状炭素繊
維２をその全長にわたつて梁１に固定する必要は
なく、第３図に示す如くシート状炭素繊維２の両
端部分の所定長さl1を定着区間として梁１に固定
すればよいのである。これにより梁１の中間部分
の長さl2は補強区間とされる。 In any of the above three attachment methods, it is not necessary to fix the sheet-like carbon fiber 2 to the beam 1 over its entire length; instead, as shown in FIG. It is sufficient to fix it to the beam 1 as a section. As a result, the length l 2 of the middle portion of the beam 1 is defined as a reinforced section.
《発明が解決しようとする問題点》
しかし、第６図に示す接着式の取付方法におい
ては、接着剤の引張せん断強度がシート状炭素繊
維２の引張強度に比べると小さいので、これを補
うために定着区間としての長さl1を長くしなけれ
ばならない。このため接着式の取付方法は比較的
短いスパンの梁１に対してその適用が困難であ
る。<<Problems to be Solved by the Invention>> However, in the adhesive mounting method shown in FIG. 6, the tensile shear strength of the adhesive is smaller than the tensile strength of the sheet-like carbon fiber 2. The length l 1 as a fixed section must be increased. For this reason, it is difficult to apply the adhesive attachment method to beams 1 having a relatively short span.
本発明は上述した接着式取付方法の問題点を有
効に解決すべく創案するに至つたものであつて、
その目的はシート状（炭素）繊維の定着区間を短
くすることのできる梁の補強方法を提供すること
にある。 The present invention has been devised to effectively solve the problems of the above-mentioned adhesive mounting method, and includes:
The purpose is to provide a method for reinforcing beams that can shorten the anchoring section of sheet-like (carbon) fibers.
《問題点を解決するための手段》
上述した問題点を解決するため本発明は、梁の
下面に軸線方向に沿つて重ね合わされると共に、
該梁の両端にその両端部が接着剤を介して定着区
間として定着され、且つ中間部分が該梁に定着さ
れずに補強区間とされた第１のシート状高強度長
繊維を設けた梁の補強方法において、上記第１の
シート状高強度長繊維に作用する引張力を軽減し
て上記定着区間を短縮するために、該第１のシー
ト状高強度長繊維の補強区間内でこれの上に重ね
合わせるように、上記梁の側面から該第１のシー
ト状高強度長繊維にかけて接着剤で第２のシート
状高強度長繊維を貼付したことを特徴とする。<<Means for Solving the Problems>> In order to solve the above-mentioned problems, the present invention provides a beam that is superimposed on the lower surface of the beam along the axial direction, and
A first sheet-like high-strength long fiber is provided at both ends of the beam, both ends of which are fixed as fixed sections via an adhesive, and the middle section is not fixed to the beam and is used as a reinforcing section. In the reinforcing method, in order to reduce the tensile force acting on the first sheet-like high-strength long fibers and shorten the fixing section, above the first sheet-like high-strength long fibers within the reinforcing section. The present invention is characterized in that a second sheet-like high-strength long fiber is attached with an adhesive from the side surface of the beam to the first sheet-like high-strength long fiber so as to be overlapped with each other.
《作用》
上述の如く構成した梁の補強方法においては、
梁にかかる曲げモーメントが梁自体の曲げ強度と
梁下面における第１のシート状高強度長繊維の引
張抵抗に加え、梁側面における第２のシート状高
強度長繊維の引張抵抗によつても受持たれること
になるので、第１のシート状高強度長繊維にかか
る引張力が軽減され、これにより第１のシート状
高強度長繊維の定着区間の短縮化が可能となる。<<Operation>> In the method of reinforcing the beam constructed as described above,
The bending moment applied to the beam is not only affected by the bending strength of the beam itself and the tensile resistance of the first sheet-like high-strength long fibers on the lower surface of the beam, but also due to the tensile resistance of the second sheet-like high-strength long fibers on the side surface of the beam. Therefore, the tensile force applied to the first sheet-like high-strength long fibers is reduced, thereby making it possible to shorten the fixing section of the first sheet-like high-strength long fibers.
《実施例》
以下に本発明の一実施例を図面に基づいて説明
する。第１図および第２図に示す如く、本発明に
おいては梁１の補強が第１のシート状高強度長繊
維５と第２のシート状高強度長繊維６によりなさ
れている。第１のシート状高強度長繊維５は前述
した第６図のシート状炭素繊維２と同様に、梁１
の下面に軸線方向に沿つて重ね合わされると共
に、梁１の両端にその両端部が接着剤を介して定
着区間として定着され、且つ中間部分が梁１に定
着されずに補強区間とされて固定されているが、
その固定区間（定着区間）は従来よりも短くなつ
ている（図示せず）。第２のシート状高強度長繊
維６は第２図に明示する如く、第１のシート状高
強度長繊維５の上に重ねて接着剤にて貼付される
とともに、その両端部が梁１の側面に接着剤にて
貼付されている。詳しくは、第１のシート状高強
度長繊維５に作用する引張力を軽減してその定着
区間を短縮するために、第１のシート状高強度長
繊維５の補強区間内でこれの上に重ね合わせるよ
うに、梁１の側面から第１のシート状高強度長繊
維５にかけて接着剤で第２のシート状高強度長繊
維６を貼付している。なお第２のシート状高強度
長繊維６に織物を用いた場合は、第２図で鎖線に
て示す如く第２のシート状高強度長繊維６の両端
部を上方に折返して貼付することができるので施
工性がきわめて良くなる。<<Example>> An example of the present invention will be described below based on the drawings. As shown in FIGS. 1 and 2, in the present invention, the beam 1 is reinforced by first sheet-like high-strength long fibers 5 and second sheet-like high-strength long fibers 6. The first sheet-like high-strength long fiber 5 is similar to the sheet-like carbon fiber 2 shown in FIG.
are superimposed on the lower surface along the axial direction, and both ends of the beam 1 are fixed to both ends of the beam 1 via adhesive as a fixed section, and the middle section is not fixed to the beam 1 but is fixed as a reinforcing section. Although it has been
The fixing section (fixing section) is shorter than the conventional one (not shown). As clearly shown in FIG. 2, the second sheet-like high-strength long fibers 6 are superimposed on the first sheet-like high-strength long fibers 5 and pasted with adhesive, and both ends of the second sheet-like high-strength long fibers are attached to the beam 1. It is attached to the side with adhesive. Specifically, in order to reduce the tensile force acting on the first sheet-like high-strength long fibers 5 and shorten the fixing section thereof, the reinforcing section of the first sheet-like high-strength long fibers 5 is A second sheet-like high-strength long fiber 6 is attached with an adhesive from the side surface of the beam 1 to the first sheet-like high-strength long fiber 5 so as to overlap. Note that when a woven fabric is used for the second sheet-like high-strength long fibers 6, both ends of the second sheet-like high-strength long fibers 6 can be folded upward and pasted as shown by the chain lines in FIG. This greatly improves workability.
上述した補強構造では、第１図ａに示す如く梁
１に曲げモーメントＭが作用すると、これに対抗
して梁１自体に曲げ応力が生じるとともに、第１
のシート状高強度長繊維５に引張力Ｔが生じ、ま
た第２のシート状高強度長繊維６に三角形分布引
張力Ｓが生じる。従つて引張力Ｔは従来に比べる
と引張力Ｓの分だけ小さくなつており、これによ
り第１のシート状高強度長繊維５の定着区間にか
かる力が軽減され、同区間を短縮しても十分な梁
１の強度を維持することができる。従つて、定着
区間を短縮できることにより、短いスパンの梁に
対しても好ましく、シート状高強度長繊維による
補強対策を施すことができる。 In the above-mentioned reinforcement structure, when a bending moment M acts on the beam 1 as shown in FIG.
A tensile force T is generated in the sheet-like high-strength long fibers 5, and a triangularly distributed tensile force S is generated in the second sheet-like high-strength long fibers 6. Therefore, the tensile force T is smaller than the conventional one by the amount of the tensile force S, which reduces the force applied to the fixing section of the first sheet-like high-strength long fiber 5, and even if the section is shortened. Sufficient strength of the beam 1 can be maintained. Therefore, since the fixing section can be shortened, it is also suitable for short-span beams, and reinforcement measures can be taken using sheet-like high-strength long fibers.
第１図ｂは、本発明の変形実施例を示してい
る。同図に示すように梁１の中間部分に第２のシ
ート状高強度長繊維６を貼付し、第１のシート状
高強度長繊維５を定着したため、ひびわれ７が生
じると第１のシート状高強度長繊維５の端部分の
定着効果が失われる。これを補うため、ひびわれ
７が生じた時点であるいは予め、第１のシート状
高強度長繊維５の端部分の上に重ねるように第２
のシート状高強度長繊維６′を梁の下面から側面
にかけて接着剤で貼付けして、梁１の強度を維持
することができる。このようにすることにより、
梁１の強度をより向上させることができる。 FIG. 1b shows a variant embodiment of the invention. As shown in the figure, since the second sheet-like high-strength long fibers 6 are attached to the middle part of the beam 1 and the first sheet-like high-strength long fibers 5 are fixed, if cracks 7 occur, the first sheet-like long fibers 6 are fixed. The fixing effect of the end portions of the high-strength long fibers 5 is lost. In order to compensate for this, at the time when the cracks 7 occur or in advance, a second sheet-like high-strength long fiber 5 is placed on top of the end portion of the first sheet-like high-strength long fiber 5.
The strength of the beam 1 can be maintained by pasting the sheet-like high-strength long fibers 6' from the bottom surface to the side surface of the beam with an adhesive. By doing this,
The strength of the beam 1 can be further improved.
以上、本発明の一実施例につき説明したが、本
発明は上記実施例に限定されることなく種々の変
形が可能であつて、例えばシート状高強度長繊維
５，６は炭素系繊維であつてもよいしその他の高
強度長繊維であつてもよい。 Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, the sheet-like high strength long fibers 5 and 6 may be carbon fibers. or other high-strength long fibers.
《発明の効果》
本発明は上述の如く、第１のシート状高強度長
繊維に作用する引張力を軽減してその定着区間を
短縮するために、第１のシート状高強度長繊維の
補強区間内でこれの上に重ね合わせるように、梁
の側面から第１のシート状高強度長繊維にかけて
接着剤で第２のシート状高強度長繊維を貼付して
いるので、梁に作用する曲げ力が第２のシート状
高強度長繊維の引張抵抗によつても受持たれるこ
とになり、その分だけ第１のシート状高強度長繊
維の引張力を軽減でき、同シート状高強度長繊維
の両端定着区間の長さを短縮化することが可能に
なり、スパンが比較的短い梁の補強に対してこの
種の補強方法を容易に適用可能となる。<<Effects of the Invention>> As described above, the present invention provides reinforcement of the first sheet-like high-strength long fibers in order to reduce the tensile force acting on the first sheet-like high-strength long fibers and shorten the fixing section thereof. Since the second sheet-like high-strength long fiber is attached with adhesive from the side of the beam to the first sheet-like high-strength long fiber so as to overlap it within the section, bending that acts on the beam is prevented. The force is also borne by the tensile resistance of the second sheet-like high-strength long fibers, and the tensile force of the first sheet-like high-strength long fibers can be reduced by that amount. It becomes possible to shorten the length of the sections where the fibers are fixed at both ends, and this type of reinforcing method can be easily applied to reinforcing beams with relatively short spans.
第１図ａ，ｂは本発明に係る補強方法を施した
梁の側面図、第２図は第１図ａの−線矢視断
面図である。また第３図〜第６図は従来例を示し
たものであつて、第３図は梁の側面図、第４図ａ
およびｂはボルトによるシート状炭素繊維の定着
部分の側面図および下面図、第５図ａおよびｂは
ボルトと押え板によるシート状炭素繊維の定着部
分の側面図および下面図、第６図ａおよびｂは接
着によるシート状炭素繊維の定着部分の側面図お
よび下面図である。
１……梁、５……第１のシート状高強度長繊
維、６……第２のシート状高強度長繊維、７……
ひびわれ。
FIGS. 1a and 1b are side views of a beam subjected to the reinforcing method according to the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. 1a. Furthermore, Figures 3 to 6 show conventional examples, with Figure 3 being a side view of the beam and Figure 4 a.
5a and b are side and bottom views of the part where the sheet-like carbon fiber is fixed by bolts, FIGS. b is a side view and a bottom view of a portion where sheet-like carbon fibers are fixed by adhesion. 1... Beam, 5... First sheet-like high-strength long fiber, 6... Second sheet-like high-strength long fiber, 7...
Cracked.
Claims (1)
と共に、該梁の両端にその両端部が接着剤を介し
て定着区間として定着され、且つ中間部分が該梁
に定着されずに補強区間とされた第１のシート状
高強度長繊維を設けた梁の補強方法において、 上記第１のシート状高強度長繊維に作用する引
張力を軽減して上記定着区間を短縮するために、
該第１のシート状高強度長繊維の補強区間内でこ
れの上に重ね合わせるように、上記梁の側面から
該第１のシート状高強度長繊維にかけて接着剤で
第２のシート状高強度長繊維を貼付したことを特
徴とする梁の補強方法。[Scope of Claims] 1. Overlaid on the lower surface of the beam along the axial direction, both ends of the beam are fixed to both ends of the beam as a fixed section via adhesive, and the intermediate portion is fixed to the beam. In a method for reinforcing a beam in which a first sheet-like high-strength long fiber is provided as a reinforced section, the anchoring section is shortened by reducing the tensile force acting on the first sheet-like high-strength long fiber. for,
A second sheet-like high-strength long fiber is applied from the side surface of the beam to the first sheet-like high-strength long fiber so as to overlap it within the reinforcing section of the first sheet-like high-strength long fiber. A beam reinforcement method characterized by pasting long fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26176187A JPH01105871A (en) | 1987-10-19 | 1987-10-19 | Method of reinforcing beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26176187A JPH01105871A (en) | 1987-10-19 | 1987-10-19 | Method of reinforcing beam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01105871A JPH01105871A (en) | 1989-04-24 |
| JPH0477104B2 true JPH0477104B2 (en) | 1992-12-07 |
Family
ID=17366328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26176187A Granted JPH01105871A (en) | 1987-10-19 | 1987-10-19 | Method of reinforcing beam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01105871A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004143847A (en) * | 2002-10-25 | 2004-05-20 | Shimizu Corp | Repair and reinforcement method of wooden long member |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3258569B2 (en) * | 1995-09-01 | 2002-02-18 | 株式会社熊谷組 | Method and structure for reinforcing the periphery of hole in concrete beam |
| KR20020057924A (en) * | 2002-06-14 | 2002-07-12 | 김동진 | Production of high yield H-Steel beam strengthening by fiber glass |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6164961A (en) * | 1984-09-05 | 1986-04-03 | 呉光塗装株式会社 | Repairing of floor surface, wall surface and ceiling surfaceof building |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6028609Y2 (en) * | 1980-12-06 | 1985-08-30 | 有限会社新光銘木 | Decorative material applied to heartwood |
-
1987
- 1987-10-19 JP JP26176187A patent/JPH01105871A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6164961A (en) * | 1984-09-05 | 1986-04-03 | 呉光塗装株式会社 | Repairing of floor surface, wall surface and ceiling surfaceof building |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004143847A (en) * | 2002-10-25 | 2004-05-20 | Shimizu Corp | Repair and reinforcement method of wooden long member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01105871A (en) | 1989-04-24 |
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