JPH0550511A - Manufacture of metal-clad reinforced resin cylindrical member - Google Patents
Manufacture of metal-clad reinforced resin cylindrical memberInfo
- Publication number
- JPH0550511A JPH0550511A JP21238091A JP21238091A JPH0550511A JP H0550511 A JPH0550511 A JP H0550511A JP 21238091 A JP21238091 A JP 21238091A JP 21238091 A JP21238091 A JP 21238091A JP H0550511 A JPH0550511 A JP H0550511A
- Authority
- JP
- Japan
- Prior art keywords
- tubular body
- metal
- inner tubular
- fiber
- reinforced resin
- 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
Landscapes
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は金属被覆繊維強化樹脂製
円筒部材の製造法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a metal-coated fiber-reinforced resin cylindrical member.
【0002】[0002]
【従来の技術及び発明が解決しようとする課題】従来か
らある金属被覆繊維強化樹脂製円筒部材の製造法として
は、まず、最も簡易な方法としてFRP製筒体に金属筒
体を接着剤を介して被嵌する方法である。2. Description of the Related Art As a conventional manufacturing method of a metal-coated fiber-reinforced resin cylindrical member, first of all, as a simplest method, a metal cylindrical body is bonded to an FRP cylindrical body with an adhesive. It is a method of fitting.
【0003】しかし、この方法には次の欠点がある。However, this method has the following drawbacks.
【0004】 この方法の場合、FRP製筒体の外径
を確定させる為FRP製筒体の表面切削を行う。ところ
で、FRPは強度を出す為に連続繊維を用いている。従
って、この方法においてFRP製筒体の表面切削をする
ということは、FRPの連続繊維を切断することにな
り、よって、必然的にFRP製筒体の強度,剛性の低下
を来すことになる。In this method, the surface of the FRP cylinder is cut to determine the outer diameter of the FRP cylinder. By the way, FRP uses continuous fibers in order to obtain strength. Therefore, cutting the surface of the FRP cylinder in this method means cutting the continuous fibers of the FRP, which inevitably leads to a decrease in strength and rigidity of the FRP cylinder. ..
【0005】また、自ずからこのFRP製筒体の表面切
削工程によりコストアップという問題も生じる。Further, the surface cutting step of the FRP cylinder naturally causes a problem of cost increase.
【0006】 また、接着剤は絶対的強度が小さく、
また、接着剤は湿度等や金属筒体とFRP製筒体とのは
め合い不良等により強度値が不均一となりバラつきが生
じるという問題もある。Also, the adhesive has a small absolute strength,
There is also a problem that the adhesive has a nonuniform strength value due to humidity or the like, a fitting failure between the metal tubular body and the FRP tubular body, and the like.
【0007】 更に、この方法は短尺品を想定した方
法である為、長尺品になると必然的に作業性が劣るとい
う問題もある。Further, since this method assumes a short product, there is also a problem that workability is inevitably deteriorated when a long product is used.
【0008】また、別の金属被覆繊維強化樹脂製円筒部
材の製造法としては、FRP製筒体に金属筒体を圧入す
る所謂クラッド法がある。As another method for manufacturing a metal-coated fiber-reinforced resin cylindrical member, there is a so-called clad method in which a metal cylinder is pressed into an FRP cylinder.
【0009】しかし、この方法にも次の欠点がある。However, this method also has the following drawbacks.
【0010】 前記方法と同様、FRP製筒体の表面
切削工程によるFRP製筒体の強度の低下,コストアッ
プという問題がある。Similar to the above method, there is a problem that the strength of the FRP cylinder is lowered and the cost is increased due to the surface cutting step of the FRP cylinder.
【0011】 更に、金属筒体は内径公差の小さい高
精度の筒体を選定しなければならず、従って、必然的に
高コストとなり、また、金属筒体の圧入被嵌の際、金属
筒体に座屈が発生しないようにある程度の肉厚筒体を選
定しなければならず、従って、この金属筒体の選定の制
約から製造効率が劣るという問題がある。尚、金属筒体
をある程度肉厚にしなければならないということは製品
の軽量化も阻害することになる。[0011] Furthermore, as the metal cylindrical body, it is necessary to select a highly accurate cylindrical body having a small inner diameter tolerance, so that the cost is inevitably high, and when the metal cylindrical body is press-fitted and fitted, the metal cylindrical body is pressed. It is necessary to select a thick-walled cylinder so that buckling does not occur. Therefore, there is a problem that the manufacturing efficiency is poor due to the restriction of the selection of the metal cylinder. In addition, the fact that the metal cylinder must be made to be thick to some extent also impedes the weight reduction of the product.
【0012】また、別の金属被覆繊維強化樹脂製円筒部
材の製造法としては、FRP製筒体の表面にメッキ層を
形成する方法がある。Another method for producing a metal-coated fiber-reinforced resin cylindrical member is to form a plating layer on the surface of an FRP cylindrical body.
【0013】しかし、この方法にも次の欠点がある。However, this method also has the following drawbacks.
【0014】 前記方法と同様FRP製筒体の表面切
削は必須作業となる為、FRP製筒体の強度の低下,コ
ストアップという問題がある。Since the surface cutting of the FRP cylinder is an essential work as in the above method, there is a problem that the strength of the FRP cylinder is lowered and the cost is increased.
【0015】 導電層の形成等メッキ処理工程には必
須の工程が多く存在し、その為作業性が劣るとともにコ
ストアップの問題が生じる。There are many indispensable steps in the plating process such as the formation of the conductive layer, so that the workability is deteriorated and the cost is increased.
【0016】 メッキ処理工程の存在故、FRP製筒
体はメッキ処理工程が可能な材質により形成しなければ
ならず、この材質制約という問題も生ずる。Due to the existence of the plating process, the FRP cylinder has to be formed of a material that can be subjected to the plating process, which causes a problem of material limitation.
【0017】本発明は上記各方法の欠点を解決した金属
被覆繊維強化樹脂製円筒部材の製造法を提供することを
技術的課題とするものである。It is a technical object of the present invention to provide a method for producing a metal-coated fiber-reinforced resin cylindrical member that solves the drawbacks of the above methods.
【0018】[0018]
【課題を解決するための手段】添付図面を参照して本発
明の要旨を説明する。The gist of the present invention will be described with reference to the accompanying drawings.
【0019】径が可変する内筒体1に樹脂含浸補強繊維
2を該内筒体1の径の拡大を阻害しない状態で巻回し、
この繊維強化樹脂筒体に金属筒体4を被嵌し、内筒体1
の内側を適宜な手段により加圧して内筒体1の径を拡大
せしめながら樹脂含浸補強繊維2を硬化させ、内筒体1
と金属筒体4とを一体化せしめて金属被覆円筒部材を形
成することを特徴とする金属被覆繊維強化樹脂製円筒部
材の製造法に係るものである。The resin-impregnated reinforcing fiber 2 is wound around the inner cylinder 1 whose diameter is variable, in a state where the expansion of the diameter of the inner cylinder 1 is not hindered,
The metal cylinder 4 is fitted on the fiber-reinforced resin cylinder to form the inner cylinder 1
The inside of the inner cylindrical body 1 is cured by applying pressure to the inner side of the inner cylindrical body 1 while expanding the diameter of the inner cylindrical body 1 to cure the resin-impregnated reinforcing fiber 2.
The present invention relates to a method for manufacturing a metal-coated fiber-reinforced resin cylindrical member, characterized in that the metal-coated cylindrical member is formed by integrating the metal cylinder body 4 and the metal cylindrical body 4.
【0020】[0020]
【作用及び実施例】図1に図示したように所定巾のガラ
スクロスプレプリグシートを巻回し、一端縁と他端縁と
を突き合わせ状態とせず、一方を他方の内側に位置せし
めた状態で硬化させて内筒体1を形成する。[Operations and Examples] As shown in FIG. 1, a glass cloth prepreg sheet having a predetermined width is wound, and one end edge and the other end edge are not abutted with each other and one is positioned inside the other to cure. Then, the inner cylindrical body 1 is formed.
【0021】また、図2に図示したようにガラスクロス
プレプリグシートの両端縁を突き合わせ状態とし、別部
材1'を一方の端縁に付設する構造の内筒体1でも良
い。Alternatively, as shown in FIG. 2, the inner cylindrical body 1 may have a structure in which both ends of the glass cloth prepreg sheet are abutted against each other and another member 1'is attached to one end.
【0022】これらの内筒体1はガラス繊維を採用して
いるが、カーボン繊維、アラミド繊維,ケブラー繊維等
どのようなものでも良く、また、金属製の薄板材で形成
しても良い。Although the inner cylinder 1 is made of glass fiber, it may be made of any material such as carbon fiber, aramid fiber, Kevlar fiber, or may be made of a thin metal plate material.
【0023】また、図面の内筒体1はその形成構造によ
り径が拡大するようにしているが、形成素材そのものが
伸縮し、その結果として内筒体1の径が可変するもので
も良く、要は径が可変するものであればどのようなもの
でも内筒体1となり得る。Further, the diameter of the inner cylinder body 1 in the drawing is enlarged due to its forming structure, but the forming material itself may expand and contract, and as a result, the diameter of the inner cylinder body 1 may be changed. Can be any inner cylinder 1 as long as it has a variable diameter.
【0024】続いて、この内筒体1を図3,4,5に図示
した回動棒体5に被嵌し、内筒体1を左右の係止突部9
で支承する。Subsequently, the inner cylinder 1 is fitted onto the rotary rod 5 shown in FIGS. 3, 4 and 5, and the inner cylinder 1 is locked to the left and right locking projections 9.
To support.
【0025】この回動棒体5は左右対象の構造であり、
以下に説明する。This rotating rod body 5 has a symmetrical structure.
This will be described below.
【0026】回動棒体5は、所定長の基杆17の両端に、
通気路7を設けた筒部材18を螺着し、基杆17に連通路8
を設け、この連通路8の一端を通気路7に臨ましめると
ともに他端を基杆17の外周面に開口して通気口3を設
け、筒部材18の基杆17側端に係止突部9を繞設し、筒部
材18の他端部にチャック把持部10を形成している。ま
た、基杆17にはゴムチューブ11が被嵌され、このゴムチ
ューブ11の端部は止着バンド6により止着されている。
また、係止突部9の外側には樹脂含浸補強繊維2を落と
し込む凹溝12が繞設されている。凹溝12の外側には図3
に図示したような樹脂含浸補強繊維2を係止せしめる係
止ピン13が繞立設された巻回治具14が被嵌止着される。The rotating rod body 5 is provided at both ends of the base rod 17 having a predetermined length.
The tubular member 18 provided with the ventilation passage 7 is screwed into the base rod 17 and the communication passage 8 is formed.
Is provided, one end of the communication passage 8 is exposed to the ventilation passage 7, and the other end is opened to the outer peripheral surface of the base rod 17 to provide the ventilation port 3, and a locking projection is provided on the end of the tubular member 18 on the base rod 17 side. 9, and a chuck grip 10 is formed at the other end of the tubular member 18. A rubber tube 11 is fitted on the base rod 17, and an end portion of the rubber tube 11 is fixed by a fixing band 6.
Further, a groove 12 into which the resin-impregnated reinforcing fiber 2 is dropped is provided on the outer side of the locking projection 9. The outside of the groove 12 is shown in FIG.
A winding jig 14 on which a locking pin 13 for locking the resin-impregnated reinforcing fiber 2 as shown in FIG.
【0027】このような構造の回動棒体5に表面に離型
剤を塗布した前記内筒体1を被嵌し、両端のチャック把
持部10をチャックで把持した状態で回転させ、エポキシ
樹脂等の熱硬化性樹脂を含浸した樹脂含浸補強繊維2を
この回動している内筒体1に巻回する。フィラメントワ
インディング法である。The inner cylindrical body 1 whose surface is coated with a release agent is fitted onto the rotating rod 5 having such a structure, and is rotated with the chuck gripping portions 10 at both ends gripped by the chucks. A resin-impregnated reinforcing fiber 2 impregnated with a thermosetting resin such as the above is wound around the rotating inner cylinder 1. It is a filament winding method.
【0028】この樹脂含浸補強繊維2の巻回は、内筒体
1の軸方向に対して直交する状態で巻回するフープ巻は
採用できず、軸方向に対しての角度θが±10°〜45
°のヘリカル巻(スパイラル巻)で巻回する(図9参照)。
これは、後記するように内筒体1の径が拡大しようとす
るとき、フープ巻ではその拡大が阻害されてしまう為で
ある。For the winding of the resin-impregnated reinforcing fiber 2, a hoop winding in which the resin-impregnated reinforcing fiber 2 is wound in a state orthogonal to the axial direction of the inner cylinder 1 cannot be adopted, and the angle θ with respect to the axial direction is ± 10 °. ~ 45
It is wound with a helical winding (spiral winding) of 10 ° (see Fig. 9).
This is because, as will be described later, when the diameter of the inner cylinder 1 is about to be expanded, the expansion is hindered by the hoop winding.
【0029】このようにして、樹脂含浸補強繊維2を内
筒体1に巻回して繊維強化樹脂層15を形成した後、図4
に図示したように左右の凹溝12の位置において夫々縛着
糸19を繊維強化樹脂層15に巻回して繊維強化樹脂層15を
凹溝12に落とし込み、図4中のa線で繊維強化樹脂層15
をカットし、巻回治具14を除去する。縛着糸19の存在に
より、繊維強化樹脂層15をカットしても繊維強化樹脂層
15の樹脂含浸補強繊維2が蛇行したり、緩んだり、回動
棒体5から脱落したりすることはなく、また、凹溝12の
存在により繊維強化樹脂層15は凹溝12に落ち込むから、
後記の金属筒体4の被嵌に何等支障は生じない。In this way, the resin-impregnated reinforcing fiber 2 is wound around the inner cylindrical body 1 to form the fiber-reinforced resin layer 15, and then, as shown in FIG.
As shown in FIG. 4, the binding yarns 19 are wound around the fiber-reinforced resin layer 15 at the positions of the left and right grooves 12, respectively, and the fiber-reinforced resin layer 15 is dropped into the grooves 12. Layer 15
Is cut and the winding jig 14 is removed. Due to the presence of the binding yarn 19, even if the fiber reinforced resin layer 15 is cut, the fiber reinforced resin layer
The resin-impregnated reinforcing fiber 2 of 15 does not meander, loosen, or fall off from the rotating rod body 5, and the presence of the groove 12 causes the fiber-reinforced resin layer 15 to fall into the groove 12.
There is no problem in fitting the metal cylinder body 4 described later.
【0030】続いて繊維強化樹脂層15に金属筒体4とし
てアルミニウム製の薄肉アルミパイプを被嵌する。Subsequently, a thin aluminum pipe made of aluminum is fitted on the fiber reinforced resin layer 15 as the metal cylinder 4.
【0031】続いて、通気路7に圧縮空気を送気する。
圧縮空気は連通路8からゴムチューブ11内に導入され、
ゴムチューブ11は膨張し、ゴムチューブ11により内筒体
1の内側は加圧されて内筒体1の径は拡大し、従って、
繊維強化樹脂層15はアルミパイプの内面に圧着せしめら
れる。この状態で回動棒体5を回動せしめながら所定温
度を加えて加熱し、繊維強化樹脂層15を硬化させると繊
維強化樹脂層15,アルミパイプが一体となった金属繊維
強化樹脂製被覆円筒部材が形成される。Subsequently, compressed air is supplied to the ventilation passage 7.
Compressed air is introduced into the rubber tube 11 from the communication passage 8,
The rubber tube 11 expands, the inside of the inner cylinder 1 is pressurized by the rubber tube 11, and the diameter of the inner cylinder 1 increases, so that
The fiber reinforced resin layer 15 is pressed onto the inner surface of the aluminum pipe. In this state, the rotating rod body 5 is rotated and a predetermined temperature is applied to heat the fiber reinforced resin layer 15 to cure the fiber reinforced resin layer 15, and the fiber reinforced resin layer 15 and the aluminum pipe are integrated into a metal fiber reinforced resin coated cylinder. A member is formed.
【0032】尚、この硬化過程の途中において縛着糸19
は除去する。繊維強化樹脂層15とアルミパイプとは端部
側より中央部の方から先に両者が一体となっていくが、
両者の中央部が一体となれば縛着糸19を除去しても樹脂
含浸補強繊維2が脱落することはない。両者の一体化が
両端部側に移っていくに従い、縛着糸19はこの両者の一
体化を阻害することになる為両者の中央部付近が一体化
したら縛着糸19を除去することが望ましい。During the curing process, the binding yarn 19
Remove. Although the fiber-reinforced resin layer 15 and the aluminum pipe are integrated together from the end side in the central part first,
If the central portions of both are integrated, the resin-impregnated reinforcing fiber 2 will not fall off even if the binding yarn 19 is removed. As the integration of the two moves to both ends, the binding yarn 19 will hinder the integration of the both, so it is desirable to remove the binding yarn 19 when the vicinity of the central portion of both is integrated. .
【0033】図6,7は圧縮空気の送気前後の断面図で
あり、符号30は間隙である。6 and 7 are cross-sectional views of the compressed air before and after air feeding, and reference numeral 30 is a gap.
【0034】続いて、送気を停止し、回動棒体5から金
属被覆繊維強化樹脂製円筒部材を引き抜き、且つ該円筒
部材から内筒体1を除去し、この金属被覆繊維強化樹脂
製円筒部材の表面を研削加工し、続いてこの研削面にハ
ードクロムメッキを施し、最後にこのハードクロムメッ
キ層16の表面を仕上げ加工して図8に図示したような製
品とする。Subsequently, air supply is stopped, the metal-coated fiber-reinforced resin cylindrical member is pulled out from the rotary rod body 5, and the inner cylinder 1 is removed from the cylindrical member. The surface of the member is ground, then the ground surface is hard chrome plated, and finally the surface of the hard chrome plated layer 16 is finished to give a product as shown in FIG.
【0035】実施例に係る金属被覆繊維強化樹脂製円筒
部材は以上の工程により製造する為、従来例に比し、加
工工程が少なくなり、従って、それだけコスト安の製品
が製造し得ることになる。Since the metal-coated fiber-reinforced resin cylindrical member according to the embodiment is manufactured by the above-mentioned steps, the number of processing steps is reduced as compared with the conventional example, so that a product with lower cost can be manufactured. ..
【0036】図10は、前述の回動棒体5とは構造の異
なる回動棒体5を採用した場合であり、図5に相当する
図面である。金属製の内支持筒体20によりゴムチューブ
11は支持されている為内筒体1の最小径がこの内支持筒
体20により規制され、従って、内筒体1が内側にたわん
だりせず、樹脂含浸補強繊維2の巻回作業性が向上す
る。符号21は通気孔である。FIG. 10 shows a case where a rotating rod body 5 having a structure different from that of the above-described rotating rod body 5 is adopted, and is a drawing corresponding to FIG. Rubber tube with metal support cylinder 20
Since 11 is supported, the minimum diameter of the inner tubular body 1 is restricted by the inner supporting tubular body 20. Therefore, the inner tubular body 1 is not bent inward, and the workability of winding the resin-impregnated reinforcing fiber 2 is improved. improves. Reference numeral 21 is a ventilation hole.
【0037】尚、図11,12は前述の実施例と同様な
考え方による金属被覆繊維強化樹脂製円筒部材の製造法
の説明図であり、図11が圧縮空気を送気する前、図1
2が圧縮空気の送気後の硬化時である。符号22は回動棒
体、23は止着バンド、24はゴムチューブ、25はゴムチュ
ーブ保護用の収縮FRP、26はゴムチューブ保護用のク
ッション材、27は繊維強化樹脂層、28はアルミ筒体、29
は通気孔、31は巻回治具である。11 and 12 are explanatory views of a method of manufacturing a metal-coated fiber-reinforced resin cylindrical member based on the same concept as in the above-mentioned embodiment, and FIG.
2 is the time of curing after the compressed air is fed. Reference numeral 22 is a rotating rod, 23 is a fastening band, 24 is a rubber tube, 25 is a contraction FRP for protecting the rubber tube, 26 is a cushion material for protecting the rubber tube, 27 is a fiber reinforced resin layer, and 28 is an aluminum cylinder. Body, 29
Is a ventilation hole, and 31 is a winding jig.
【0038】[0038]
【発明の効果】本発明は上述のようにしたから、極めて
量産性に秀れ、低コストの金属被覆繊維強化樹脂製円筒
部材を製造し得ることになる。As described above, the present invention makes it possible to produce a metal-coated fiber-reinforced resin cylindrical member which is extremely excellent in mass productivity and which is low in cost.
【図1】本発明に係る内筒体の断面図である。FIG. 1 is a sectional view of an inner cylinder according to the present invention.
【図2】本発明に係る内筒体の別例の断面図である。FIG. 2 is a cross-sectional view of another example of the inner cylinder body according to the present invention.
【図3】本発明の説明断面図である。FIG. 3 is an explanatory sectional view of the present invention.
【図4】本発明の説明断面図である。FIG. 4 is an explanatory sectional view of the present invention.
【図5】本発明の説明断面図である。FIG. 5 is an explanatory sectional view of the present invention.
【図6】本発明の要部の説明断面図である。FIG. 6 is an explanatory sectional view of a main part of the present invention.
【図7】本発明の要部の説明断面図である。FIG. 7 is an explanatory cross-sectional view of a main part of the present invention.
【図8】本発明により製造した製品の断面図であるFIG. 8 is a cross-sectional view of a product manufactured according to the present invention.
【図9】本発明の説明図である。FIG. 9 is an explanatory diagram of the present invention.
【図10】本発明の別例の説明断面図である。FIG. 10 is an explanatory cross-sectional view of another example of the present invention.
【図11】本発明の別例の説明断面図である。FIG. 11 is an explanatory cross-sectional view of another example of the present invention.
【図12】本発明の別例の説明断面図である。FIG. 12 is an explanatory cross-sectional view of another example of the present invention.
【符号の説明】 1 内筒体 2 樹脂含浸補強繊維 4 金属筒体[Explanation of Codes] 1 inner cylinder 2 resin-impregnated reinforcing fiber 4 metal cylinder
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 B29K 105:06 B29L 9:00 4F ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI Technical display area B29K 105: 06 B29L 9:00 4F
Claims (1)
を該内筒体の径の拡大を阻害しない状態で巻回し、この
繊維強化樹脂筒体に金属筒体を被嵌し、内筒体の内側を
適宜な手段により加圧して内筒体の径を拡大せしめなが
ら樹脂含浸補強繊維を硬化させ、内筒体と金属筒体とを
一体化せしめて金属被覆円筒部材を形成することを特徴
とする金属被覆繊維強化樹脂製円筒部材の製造法。1. A resin-impregnated reinforcing fiber is wound around an inner cylinder whose diameter is variable without hindering expansion of the diameter of the inner cylinder, and a metal cylinder is fitted on the fiber-reinforced resin cylinder to Forming a metal-coated cylindrical member by pressing the inside of the tubular body with an appropriate means to cure the resin-impregnated reinforcing fiber while expanding the diameter of the inner tubular body and integrating the inner tubular body and the metal tubular body. A method for producing a metal-coated fiber-reinforced resin cylindrical member, comprising:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21238091A JPH0550511A (en) | 1991-08-23 | 1991-08-23 | Manufacture of metal-clad reinforced resin cylindrical member |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21238091A JPH0550511A (en) | 1991-08-23 | 1991-08-23 | Manufacture of metal-clad reinforced resin cylindrical member |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0550511A true JPH0550511A (en) | 1993-03-02 |
Family
ID=16621618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21238091A Pending JPH0550511A (en) | 1991-08-23 | 1991-08-23 | Manufacture of metal-clad reinforced resin cylindrical member |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0550511A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2021075033A (en) * | 2019-11-12 | 2021-05-20 | 朴 炳 權PARK, Byoung Kwon | Method for repairing and reinforcing aged pipe and repairing and reinforcing structure |
-
1991
- 1991-08-23 JP JP21238091A patent/JPH0550511A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2021075033A (en) * | 2019-11-12 | 2021-05-20 | 朴 炳 權PARK, Byoung Kwon | Method for repairing and reinforcing aged pipe and repairing and reinforcing structure |
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