JP5837628B2 - Fiber reinforced plastic curved pipe - Google Patents

Fiber reinforced plastic curved pipe Download PDF

Info

Publication number
JP5837628B2
JP5837628B2 JP2014014315A JP2014014315A JP5837628B2 JP 5837628 B2 JP5837628 B2 JP 5837628B2 JP 2014014315 A JP2014014315 A JP 2014014315A JP 2014014315 A JP2014014315 A JP 2014014315A JP 5837628 B2 JP5837628 B2 JP 5837628B2
Authority
JP
Japan
Prior art keywords
reinforced plastic
pipe
fiber reinforced
fiber
frp
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.)
Active
Application number
JP2014014315A
Other languages
Japanese (ja)
Other versions
JP2015140867A (en
Inventor
聡 大塚
聡 大塚
昌也 硲
昌也 硲
聡 間宮
聡 間宮
藤本　光伸
光伸 藤本
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.)
Kurimoto Ltd
Original Assignee
Kurimoto 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=53771347&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JP5837628(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kurimoto Ltd filed Critical Kurimoto Ltd
Priority to JP2014014315A priority Critical patent/JP5837628B2/en
Publication of JP2015140867A publication Critical patent/JP2015140867A/en
Application granted granted Critical
Publication of JP5837628B2 publication Critical patent/JP5837628B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Rigid Pipes And Flexible Pipes (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Description

本発明は、水力発電所の水圧管等に用いられる繊維強化プラスチック製曲管に関する。   The present invention relates to a fiber reinforced plastic bent pipe used for a hydraulic pipe or the like of a hydroelectric power plant.

繊維強化プラスチック（ＦＲＰ）で形成したＦＲＰ管は、金属管に比べて軽量で耐食性にも優れるため、水輸送管の分野でも広く用いられている。水輸送管としてＦＲＰ管を配管する際、管路の方向が変化する位置には、通常、少なくとも一端面が管軸方向に対して傾斜した複数の繊維強化プラスチック製短管（ＦＲＰ製短管）を、曲管状となるように端面どうしを突き合わせた状態で接合した繊維強化プラスチック製曲管（ＦＲＰ製曲管）が使用される。これは、単一のＦＲＰ管で滑らかな円弧状の管（一般に、スムースベンド管という。）を製造することが技術的に難しいことによる。   FRP pipes made of fiber reinforced plastic (FRP) are widely used in the field of water transport pipes because they are lighter and have better corrosion resistance than metal pipes. When piping an FRP pipe as a water transport pipe, a plurality of fiber reinforced plastic short pipes (FRP short pipes) having at least one end face inclined with respect to the pipe axis direction are usually located at positions where the direction of the pipe line changes. The fiber reinforced plastic curved pipe (FRP curved pipe) is used in which the end faces are joined to each other so as to form a curved pipe. This is because it is technically difficult to manufacture a smooth arc-shaped tube (generally referred to as a smooth bend tube) with a single FRP tube.

このＦＲＰ製曲管の製造方法は、通常、予め直管状のＦＲＰ管を管軸方向に対して所定の角度で切断して、上記のＦＲＰ製短管を複数製作しておき、これらの各ＦＲＰ製短管を上記のように突き合わせた状態で、それぞれの突き合わせ部の外周面に樹脂等の接続層を形成することによって接合している（例えば、特許文献１参照。）。   This FRP bent pipe is usually manufactured by cutting a straight FRP pipe at a predetermined angle with respect to the pipe axis direction in advance to produce a plurality of the above FRP short pipes. In a state where the short pipes are butted as described above, bonding is performed by forming a connection layer such as a resin on the outer peripheral surface of each butted portion (see, for example, Patent Document 1).

特開平１０−３０５４８１号公報（図７）Japanese Patent Laid-Open No. 10-305481 (FIG. 7)

ところで、上記特許文献１のような方法で製造されるＦＲＰ製曲管は、農業用水路や下水道に使用される場合、互いに隣接する２つのＦＲＰ製短管の管軸方向のなす角度（各節ごとの角度の振り）が３０度以下に設定される。しかし、通常は、例えば図５に示すように、各節ごとの角度の振りθが設定範囲内でも比較的大きく設定されるので（図５ではθ＝３０度）、そのＦＲＰ製曲管は、外観形状がスムースベンド管とかなり異なり、性能面でもスムースベンド管に比べて劣るものとなる。すなわち、曲管の両端に配されるＦＲＰ製短管５１ａと中間のＦＲＰ製短管５１ｂとの接合、および中間のＦＲＰ製短管５１ｂどうしの接合を行う接続層５２は、曲管の外周面から突出する状態で形成されているので、この接続層５２が分離したり剥離したりしやすく、その分離や剥離によって十分な水密性を維持できなくなるおそれがある。また、曲管内での水流に対する抵抗が大きいため、管内水圧の圧損が大きく、効率的に水を輸送できないという問題もある。   By the way, when the FRP bent pipe manufactured by the method as described in Patent Document 1 is used for agricultural waterways and sewers, an angle formed by the pipe axis directions of two adjacent FRP short pipes (for each node). Is set at 30 degrees or less. However, normally, as shown in FIG. 5, for example, the angle swing θ for each node is set to be relatively large even within the setting range (θ = 30 degrees in FIG. 5). The appearance shape is quite different from the smooth bend pipe, and the performance is inferior to the smooth bend pipe. That is, the connection layer 52 that joins the FRP short pipe 51a and the intermediate FRP short pipe 51b arranged at both ends of the curved pipe and the intermediate FRP short pipe 51b is connected to the outer peripheral surface of the curved pipe. Therefore, the connection layer 52 is easily separated or peeled off, and there is a possibility that sufficient watertightness cannot be maintained due to the separation or peeling. Further, since the resistance to the water flow in the curved pipe is large, there is a problem that the pressure loss of the water pressure in the pipe is large and water cannot be efficiently transported.

これに対し、水力発電所の水圧管に使用されるＦＲＰ製曲管は、管内水圧の圧損をなるべく小さくするために、規定によって曲率半径が管内径の３倍以上で、各節ごとの角度の振りが７度以下とされるので、農業用水路や下水道に使用されるものよりも水輸送の効率は高い。しかしながら、スムースベンド管に比べると、まだ管内水圧の圧損が大きく、水輸送効率向上の余地があるし、接続層の分離や剥離による水密性の低下のおそれもある。   On the other hand, FRP curved pipes used for hydraulic power plant hydraulic pipes have a radius of curvature of 3 times or more of the pipe inner diameter by regulations, and the angle of each node in order to minimize the pressure loss of the pipe water pressure. Since the swing is less than 7 degrees, the water transport efficiency is higher than that used for agricultural waterways and sewers. However, compared with the smooth bend pipe, the pressure loss of the pipe water pressure is still large, there is room for improving the water transport efficiency, and there is a possibility that the water tightness may be lowered due to separation or separation of the connection layer.

そこで、本発明は、複数のＦＲＰ製短管の接合によって製造されるＦＲＰ製曲管を、スムースベンド管に匹敵する性能を有するものとすることを課題とする。   Accordingly, an object of the present invention is to provide an FRP bent pipe manufactured by joining a plurality of FRP short pipes with performance comparable to a smooth bend pipe.

上記の課題を解決するために、本願の第１の発明は、少なくとも一端面が管軸方向に対して傾斜した複数の繊維強化プラスチック製短管（ＦＲＰ製短管）を、曲管状となるように端面どうしを突き合わせた状態で接合した繊維強化プラスチック製曲管（ＦＲＰ製曲管）において、前記各繊維強化プラスチック製短管は、それぞれの突き合わせ部の外周面に、繊維の方向性がランダムな布状体とクロス状に織られた補強繊維とを樹脂含浸させて積層した積層体を形成することによって接合されており、前記積層体が互いに隣接するものと連続するように形成されている構成を採用した。ここで、ＦＲＰ製曲管およびＦＲＰ製短管とは、それぞれ管体がＦＲＰ層とその間に挟まれるモルタル層で形成されたＦＲＰＭ製曲管およびＦＲＰＭ製短管を含むものとし、「連続」とは、積層体が互いに隣接するものと一部で重なり合っている形態、端面どうしを突き合わされている形態および一体に形成されている形態を含むものとする（以下同じ）。   In order to solve the above-described problems, the first invention of the present application is to form a plurality of fiber reinforced plastic short tubes (FRP short tubes) having at least one end surface inclined with respect to the tube axis direction into a curved tube shape. In the fiber reinforced plastic bent pipe (FRP bent pipe) joined in a state where the end faces are butted together, the fiber reinforced plastic short pipe has a random fiber orientation on the outer peripheral surface of each butted portion. A structure in which a cloth body and a reinforcing fiber woven in a cloth shape are joined by resin impregnation to form a laminated body, and the laminated body is formed so as to be continuous with adjacent ones. It was adopted. Here, the FRP bent tube and the FRP short tube include an FRPM bent tube and an FRPM short tube formed by a mortar layer in which the pipe body is sandwiched between the FRP layer and “continuous”. In addition, it is assumed that the laminated body includes a form in which the laminated body partially overlaps with a part adjacent to each other, a form in which end faces are abutted with each other, and a form in which they are integrally formed (the same applies hereinafter).

すなわち、第１の発明は、各ＦＲＰ製短管の突き合わせ部の外周面に、繊維の方向性がランダムで水密性の確保に適した布状体と、クロス状に織られ接合強度を高めるのに適した補強繊維とを樹脂含浸させて積層した積層体を形成することによってＦＲＰ製短管の接合を行うようにするとともに、その積層体を互いに隣接するものと連続するように形成することにより、積層体のＦＲＰ製曲管外周面からの分離や剥離を生じにくくして、長期間にわたって十分な水密性を維持できるようにしたのである。   That is, according to the first aspect of the present invention, the cloth-like body having a random fiber orientation and suitable for ensuring water-tightness is woven in a cloth shape on the outer peripheral surface of the butt portion of each FRP short tube, and the joint strength is increased. By forming a laminated body obtained by impregnating a reinforcing fiber suitable for the resin with a resin, the FRP short pipe is joined, and the laminated body is formed so as to be continuous with those adjacent to each other. Thus, separation and peeling from the outer peripheral surface of the FRP bent pipe of the laminate were made difficult to maintain sufficient water tightness over a long period of time.

また、本願の第２の発明は、少なくとも一端面が管軸方向に対して傾斜した複数の繊維強化プラスチック製短管（ＦＲＰ製短管）を、曲管状となるように端面どうしを突き合わせた状態で接合した繊維強化プラスチック製曲管（ＦＲＰ製曲管）において、前記各繊維強化プラスチック製短管の突き合わせ部の内周面に、繊維の方向性がランダムな布状体を樹脂含浸させて積層した積層体が、互いに隣接するものと連続するように形成されている構成を採用した。   In the second invention of the present application, a plurality of fiber reinforced plastic short pipes (FRP short pipes) whose at least one end face is inclined with respect to the pipe axis direction are faced to each other so as to be curved. In the fiber reinforced plastic bent pipe (FRP bent pipe) joined together, the inner peripheral surface of the butt portion of each fiber reinforced plastic short pipe is impregnated with a cloth-like body with random fiber orientation and laminated. The configuration in which the laminated body is formed so as to be continuous with those adjacent to each other is adopted.

この第２の発明は、各ＦＲＰ製短管の突き合わせ部の内周面に、繊維の方向性がランダムで水密性の確保に適した布状体を樹脂含浸させて積層した積層体を、互いに隣接するものと連続するように形成することにより、水密性の向上を図るとともに、管内の水流に対する抵抗を小さくして管内水圧の圧損を低減し、効率的に水を輸送できるようにしたのである。   In this second invention, laminated bodies obtained by laminating cloth-like bodies having random fiber orientations suitable for ensuring watertightness on the inner peripheral surfaces of the abutting portions of the respective short pipes made of FRP are laminated with each other. By forming it so as to be continuous with the adjacent one, water tightness was improved and resistance to water flow in the pipe was reduced to reduce pressure loss in the pipe water pressure so that water could be transported efficiently. .

そして、上記第１および第２の発明は、曲率半径が管内径の３倍以上で、前記各繊維強化プラスチック製短管のうち、互いに隣接する２つの繊維強化プラスチック製短管の管軸方向のなす角度（各節ごとの角度の振り）を７度以下とした繊維強化プラスチック製曲管に、特に有効に適用することができる。   In the first and second inventions, the radius of curvature is at least three times the inner diameter of the tube, and among the short tubes made of fiber reinforced plastic, the two adjacent fiber short tubes made of fiber reinforced plastic are arranged in the tube axis direction. The present invention can be applied particularly effectively to a fiber reinforced plastic bent tube in which the angle formed (the swing of the angle for each node) is 7 degrees or less.

本発明のＦＲＰ製曲管は、上述したように、ＦＲＰ製短管の突き合わせ部の外周面や内周面に積層体を互いに隣接するものと連続するように形成したものであるから、水密性や水輸送効率の点でスムースベンド管に近い性能を有するものとなる。   As described above, the FRP bent pipe of the present invention is formed so that the laminated body is continuous with the adjacent ones on the outer peripheral surface and inner peripheral surface of the butted portion of the FRP short pipe. In addition, in terms of water transport efficiency, it has performance close to that of a smooth bend pipe.

実施形態のＦＲＰ製曲管の縦断面図Longitudinal sectional view of FRP curved pipe of embodiment 図１の要部を拡大した縦断面図Fig. 1 is an enlarged longitudinal sectional view of the main part of Fig. 1 図２に対応して積層体の形成形態の変形例を示す縦断面図The longitudinal cross-sectional view which shows the modification of the formation form of a laminated body corresponding to FIG. 図２に対応して積層体の形成形態の別の変形例を示す縦断面図The longitudinal cross-sectional view which shows another modification of the formation form of a laminated body corresponding to FIG. 従来のＦＲＰ製曲管の縦断面図Vertical section of a conventional FRP curved pipe

以下、図面に基づき、本発明の実施形態を説明する。このＦＲＰ製曲管は、図１に示すように、２種類のＦＲＰ製短管１（１ａおよび１ｂ）を、曲管状となるように端面どうしを突き合わせた状態で接合したもので、水力発電所の水圧管に使用されるため、その曲率半径が管内径の３倍以上で、互いに隣接する２つのＦＲＰ製短管１の管軸方向のなす角度（各節ごとの角度の振り）が７度以下とされている。なお、以下では、ＦＲＰ製曲管を単に「曲管」、ＦＲＰ製短管を単に「短管」とも称する。また、短管１のうち、曲管の両端に配されるものを接続用短管１ａ、曲管の中間部すなわち両接続用短管１ａの間に配されるものを中間短管１ｂと称する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, this FRP bent pipe is obtained by joining two types of FRP short pipes 1 (1 a and 1 b) in a state where end faces are butted together so as to form a curved pipe. Because the radius of curvature is more than 3 times the inner diameter of the pipe, the angle formed by the two FRP short pipes 1 adjacent to each other in the pipe axis direction (angle swing for each node) is 7 degrees. It is as follows. Hereinafter, the FRP bent pipe is also simply referred to as “curved pipe”, and the FRP short pipe is also simply referred to as “short pipe”. Further, among the short pipes 1, those arranged at both ends of the curved pipe are referred to as connecting short pipes 1a, and those arranged in the middle portion of the bent pipe, that is, between the connecting short pipes 1a, are referred to as intermediate short pipes 1b. .

前記各短管１は、いずれもＦＲＰ製の直管を管軸方向に対して同じ角度で切断して製作したものである。そのうち、接続用短管１ａは、一端面のみが管軸方向に対して傾斜しており、他端側が接続管を介して水圧管の直線部を構成するＦＲＰ製直管に接続される（図示省略）。一方、中間短管１ｂは、接続用短管１ａよりも短尺で、両端面が管軸方向に対して傾斜しており、隣接する接続用短管１ａまたは中間短管１ｂと接合される。   Each of the short pipes 1 is manufactured by cutting a straight pipe made of FRP at the same angle with respect to the pipe axis direction. Among them, only one end surface of the connecting short pipe 1a is inclined with respect to the pipe axis direction, and the other end side is connected to an FRP straight pipe constituting the straight portion of the hydraulic pipe through the connecting pipe (illustration). (Omitted). On the other hand, the intermediate short tube 1b is shorter than the connecting short tube 1a, and both end surfaces are inclined with respect to the tube axis direction, and is joined to the adjacent connecting short tube 1a or the intermediate short tube 1b.

前記短管１どうしの接合は、接合する短管１の端面どうしを突き合わせた状態で、その突き合わせ部の外周面に樹脂を含む積層体２を形成することによって行われる。また、突き合わせ部の内周面には、後述するように水密性を向上させるための積層体３が形成されている。   The short tubes 1 are joined to each other by forming a laminated body 2 containing a resin on the outer peripheral surface of the butted portion in a state where the end surfaces of the short tubes 1 to be joined are butted. Moreover, the laminated body 3 for improving water-tightness is formed in the inner peripheral surface of a butt | matching part so that it may mention later.

前記積層体２、３のうち、曲管外周側に形成される積層体２は、繊維の方向性がランダムな布状体であるガラスマットと、クロス状に織られた補強繊維であるガラスクロスとを樹脂含浸させて積層したものであり、曲管内周側に形成される積層体３は、ガラスマットのみを樹脂含浸させて積層したものである。ガラスマットおよびガラスクロスに含浸させる樹脂としては、不飽和ポリエステル樹脂が使用されている。なお、曲管外周側の積層体２内におけるガラスマットとガラスクロスの配置は任意であるが、最内層には水密性の確保に適したガラスマットを、最外層には接合強度を高めるのに適したガラスクロスを配することが望ましい。   Of the laminates 2 and 3, the laminate 2 formed on the outer peripheral side of the curved pipe is composed of a glass mat that is a cloth-like body with random fiber orientation and a glass cloth that is a reinforcing fiber woven in a cloth shape. And the laminate 3 formed on the inner peripheral side of the curved pipe is obtained by impregnating only a glass mat with resin. An unsaturated polyester resin is used as the resin impregnated into the glass mat and the glass cloth. The arrangement of the glass mat and the glass cloth in the laminated body 2 on the outer periphery side of the curved pipe is arbitrary, but a glass mat suitable for ensuring water-tightness is used for the innermost layer, and the bonding strength is increased for the outermost layer. It is desirable to arrange a suitable glass cloth.

これらの各積層体２、３は以下の手順で形成される。まず、短管１を３節程度突き合わせ、その外周面に各突き合わせ部を一緒に覆う大きさのガラスマットおよびガラスクロスを樹脂含浸させて積層することにより、外周側の積層体２を形成し、その後、内周面に外周側と同程度の大きさのガラスマットを樹脂含浸させて積層することにより、内周側の積層体３を形成して、３節程度の短管１の接合体を製作する。これを繰り返して必要数の接合体を製作した後、接合体どうしを突き合わせて、その突き合わせ部の外周面および内周面に、接合体製作時と同様の積層体２、３を、隣接する接合体の積層体２、３に重なるように形成する。この手順で形成された積層体２、３は、図２に示すように、互いに隣接するものと一体となっているか、一部で重なり合う形態で連続している。   Each of these laminates 2 and 3 is formed by the following procedure. First, the short tube 1 is butted about 3 nodes, and the outer circumferential surface of the laminated body 2 is formed by laminating and laminating a glass mat and a glass cloth having a size covering each butted portion together on the outer circumferential surface, Thereafter, a glass mat having the same size as that of the outer peripheral side is impregnated on the inner peripheral surface and laminated to form an inner peripheral laminated body 3, and a short tube 1 joined body having about three nodes is formed. To manufacture. After repeating this to produce the required number of joined bodies, the joined bodies are butted together, and the laminated bodies 2 and 3 similar to those at the time of producing the joined body are joined to the outer peripheral surface and inner peripheral surface of the butted portion. It forms so that it may overlap with the laminated bodies 2 and 3 of a body. As shown in FIG. 2, the laminates 2 and 3 formed by this procedure are integrated with ones adjacent to each other, or are partially overlapped and continuous.

図３および図４は、積層体２、３の形成形態の変形例を示す。図３の例では、各積層体２、３をいずれも互いに隣接するものと重なり合う形態で連続するように形成している。一方、図４の例では、各積層体２、３をいずれも互いに隣接するものと端面どうしが突き合う形態で連続するように形成している。   3 and 4 show a modified example of the formation form of the laminates 2 and 3. In the example of FIG. 3, each of the stacked bodies 2 and 3 is formed so as to be continuous with one adjacent to each other. On the other hand, in the example of FIG. 4, each of the stacked bodies 2 and 3 is formed so as to be continuous in a form in which the adjacent end surfaces face each other.

なお、図２〜４では外周側の積層体２と内周側の積層体３とを同じ形態で連続するように形成した例を示したが、各積層体２、３がそれぞれ連続するように形成されていれば、その形成形態は外周側と内周側で異なっていてもよい。   2 to 4 show an example in which the outer peripheral laminate 2 and the inner peripheral laminate 3 are formed to be continuous in the same form, but the respective laminates 2 and 3 are continuous. As long as it is formed, the form of formation may be different between the outer peripheral side and the inner peripheral side.

このＦＲＰ製曲管は、上記の構成であり、外周側および内周側の積層体２、３を互いに隣接するものと連続するように形成したので、外観形状がスムースベンド管に近いものとなり、性能面でもスムースベンド管に匹敵するものとなる。   This FRP bent pipe has the above-described configuration, and the outer peripheral side and inner peripheral side laminated bodies 2 and 3 are formed so as to be continuous with those adjacent to each other, so that the external shape is close to a smooth bend pipe, In terms of performance, it is comparable to a smooth bend tube.

すなわち、各短管１を接合する外周側の積層体２が曲管外周面から分離したり剥離したりしにくく、長期間にわたって十分な水密性を維持できるし、内周側の積層体３の形成により、管内の水流に対する抵抗が小さくなって、管内水圧の圧損がスムースベンド管で生じる程度まで低減され、結果としてスムースベンド管と同等の水輸送効率が得られるようになっている。   That is, it is difficult for the outer peripheral laminate 2 joining each short tube 1 to be separated from the outer peripheral surface of the curved tube or to be peeled off, and to maintain sufficient watertightness for a long period of time. As a result, the resistance to the water flow in the pipe is reduced, the pressure loss of the pipe water pressure is reduced to the level that occurs in the smooth bend pipe, and as a result, the water transport efficiency equivalent to that of the smooth bend pipe is obtained.

ここで、外周側の積層体２をガラスマットとガラスクロスとの積層によって形成し、内周側の積層体３をガラスマットの積層によって形成したことは、曲管の水密性および接合強度の向上に貢献している。また、ガラスマットは、繊維の方向性がランダムで水密性の確保に適した他の布状体に代えることができ、ガラスクロスは、クロス状に織られ接合強度を高めるのに適した他の補強繊維（ロービングクロス等）に代えることができる。   Here, the outer peripheral laminate 2 is formed by laminating a glass mat and a glass cloth, and the inner peripheral laminate 3 is formed by laminating a glass mat, which improves the water tightness and bonding strength of the curved pipe. Contributing to In addition, the glass mat can be replaced with another cloth-like body having random fiber orientation and suitable for ensuring watertightness, and the glass cloth is woven into a cloth shape and is suitable for increasing the bonding strength. It can be replaced with a reinforcing fiber (roving cloth or the like).

なお、本発明は、実施形態のような水力発電所の水圧管に用いられるＦＲＰ製曲管だけでなく、水輸送管用のＦＲＰ製曲管に広く適用することができる。また、前述のように、発明の対象にはＦＲＰＭ製曲管も含まれる。   The present invention can be widely applied not only to FRP bent pipes used for hydraulic pipes of hydroelectric power plants as in the embodiment but also to FRP bent pipes for water transport pipes. Further, as described above, the subject of the invention includes a bent pipe made of FRPM.

１ ＦＲＰ製短管
１ａ 接続用短管
１ｂ 中間短管
２ 積層体（外周側）
３ 積層体（内周側） 1 FRP short pipe 1a Connection short pipe 1b Intermediate short pipe 2 Laminate (outer circumference side)
3 Laminate (inner circumference side)

Claims (3)

少なくとも一端面が管軸方向に対して傾斜した複数の繊維強化プラスチック製短管を、曲管状となるように端面どうしを突き合わせた状態で接合した繊維強化プラスチック製曲管において、
前記各繊維強化プラスチック製短管は、それぞれの突き合わせ部の外周面に、繊維の方向性がランダムな布状体とクロス状に織られた補強繊維とを樹脂含浸させて積層した積層体を形成することによって接合されており、前記積層体は、最内層に前記繊維の方向性がランダムな布状体が配され、互いに隣接するものと連続するように形成されていることを特徴とする繊維強化プラスチック製曲管。 In a fiber reinforced plastic curved pipe joined with a plurality of fiber reinforced plastic short pipes whose at least one end face is inclined with respect to the pipe axis direction in a state where the end faces are brought into contact with each other so as to be a curved pipe,
Each of the fiber reinforced plastic short tubes forms a laminated body on the outer peripheral surface of each butt portion by impregnating resin-impregnated cloth-like bodies with random fiber orientations and reinforcing fibers woven in a cloth shape. The laminated body is formed such that a cloth-like body in which the direction of the fibers is random is arranged in the innermost layer and is continuous with the adjacent ones. Reinforced plastic curved pipe. 少なくとも一端面が管軸方向に対して傾斜した複数の繊維強化プラスチック製短管を、曲管状となるように端面どうしを突き合わせた状態で接合した繊維強化プラスチック製曲管において、
前記各繊維強化プラスチック製短管の突き合わせ部の内周面に、繊維の方向性がランダムな布状体のみを樹脂含浸させて積層した積層体が、互いに隣接するものと連続するように形成されていることを特徴とする繊維強化プラスチック製曲管。
In a fiber reinforced plastic curved pipe joined with a plurality of fiber reinforced plastic short pipes whose at least one end face is inclined with respect to the pipe axis direction in a state where the end faces are brought into contact with each other so as to be a curved pipe,
On the inner peripheral surface of the butt portion of each fiber reinforced plastic short tube, a laminate in which only a cloth-like body with random fiber orientation is impregnated with a resin is laminated so as to be continuous with those adjacent to each other. A fiber-reinforced plastic bent tube characterized by
曲率半径が管内径の３倍以上で、前記各繊維強化プラスチック製短管のうち、互いに隣接する２つの繊維強化プラスチック製短管の管軸方向のなす角度を７度以下としたことを特徴とする請求項１または２に記載の繊維強化プラスチック製曲管。   The radius of curvature is three times or more of the inner diameter of the tube, and the angle formed by the tube axis directions of two adjacent fiber reinforced plastic short tubes among the fiber reinforced plastic short tubes is 7 degrees or less. The bent pipe made of fiber-reinforced plastic according to claim 1 or 2.
JP2014014315A 2014-01-29 2014-01-29 Fiber reinforced plastic curved pipe Active JP5837628B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014014315A JP5837628B2 (en) 2014-01-29 2014-01-29 Fiber reinforced plastic curved pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2014014315A JP5837628B2 (en) 2014-01-29 2014-01-29 Fiber reinforced plastic curved pipe

Publications (2)

Publication Number Publication Date
JP2015140867A JP2015140867A (en) 2015-08-03
JP5837628B2 true JP5837628B2 (en) 2015-12-24

Family

ID=53771347

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2014014315A Active JP5837628B2 (en) 2014-01-29 2014-01-29 Fiber reinforced plastic curved pipe

Country Status (1)

Country Link
JP (1) JP5837628B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6789039B2 (en) * 2016-08-30 2020-11-25 積水化学工業株式会社 Curved tube
CN107542493B (en) * 2017-10-13 2019-04-19 北京工业大学 A kind of tunnel drainage system construction method of steel-FRP compound bellows
JP7134046B2 (en) * 2018-09-28 2022-09-09 積水化学工業株式会社 curved pipe
JP7449056B2 (en) * 2019-09-11 2024-03-13 株式会社栗本鐵工所 curved pipe

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS457254Y1 (en) * 1965-12-28 1970-04-08
JPS4941544U (en) * 1972-07-14 1974-04-12
JPS5720952Y2 (en) * 1978-06-09 1982-05-06
JPS59100173U (en) * 1982-11-12 1984-07-06 日立造船株式会社 Piping structure
JPH0645757Y2 (en) * 1989-03-15 1994-11-24 積水化学工業株式会社 Resin composite pipe fitting
JPH1047556A (en) * 1996-05-31 1998-02-20 Sekisui Chem Co Ltd Pipe joint
JPH11291034A (en) * 1998-04-08 1999-10-26 Takeshi Uemura Bent type
JP3832999B2 (en) * 1999-04-05 2006-10-11 株式会社クボタ Tube structure
JP3830482B2 (en) * 2003-10-15 2006-10-04 株式会社クボタ Curved pipe joint structure of FRPM pipe
JP5238545B2 (en) * 2009-02-25 2013-07-17 積水化学工業株式会社 Curved pipe joint structure
JP5427543B2 (en) * 2009-10-09 2014-02-26 積水化学工業株式会社 Cylindrical member joining method, cylindrical molded body molding method, and molded body

Also Published As

Publication number Publication date
JP2015140867A (en) 2015-08-03

Similar Documents

Publication Publication Date Title
JP5837628B2 (en) Fiber reinforced plastic curved pipe
US4619470A (en) Flange connection assembly for fiber-reinforced plastic pipe members
WO2011060695A1 (en) Steel strip reinforced composite belt for helically corrugated plastic-steel winding pipe
GB2289928A (en) Connecting fibre composite rods end-to-end
JP6789039B2 (en) Curved tube
CN107842652B (en) Double-flat-wall plastic steel winding pipe
JP4964706B2 (en) Pipe fitting
JP5238545B2 (en) Curved pipe joint structure
JP3217505U (en) Bellows type fitting
JP2014224431A (en) Bonding structure
US9829125B2 (en) Flexible high-pressure pipe structure
JP7449056B2 (en) curved pipe
KR101588213B1 (en) Method for connecting large diameter pipes
JPH11287378A (en) Branch pipe
JP7413006B2 (en) Synthetic resin flange pipe fittings
JP2023173101A (en) Fiber-reinforced resin-based bent pipe and method for manufacturing the same
CN114508633A (en) Novel annular reinforced polyethylene composite plastic pipeline
JP3832999B2 (en) Tube structure
KR100876004B1 (en) The production technique by which the wire mash covering types are corrugated steel pipe and this among these
JP7406603B2 (en) curved pipe
CN114673307B (en) Method for pasting winding connection reinforcing steel bar by using high-strength fiber fabric and structure adhesive
CN213954582U (en) Large-diameter reinforced low-pressure water supply pipeline
CN220930420U (en) Corrosion-resistant pipe with vertical rib rigidity enhancement structure
JP2011163524A (en) Pipe connecting structure and pipe connecting method
JP3973427B2 (en) Plastic pipe connection method and connection structure

Legal Events

Date Code Title Description
A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150612

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20151020

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20151105

R150 Certificate of patent or registration of utility model

Ref document number: 5837628

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R157 Certificate of patent or utility model (correction)

Free format text: JAPANESE INTERMEDIATE CODE: R157