JP6789039B2 - Curved tube - Google Patents

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JP6789039B2
JP6789039B2 JP2016167490A JP2016167490A JP6789039B2 JP 6789039 B2 JP6789039 B2 JP 6789039B2 JP 2016167490 A JP2016167490 A JP 2016167490A JP 2016167490 A JP2016167490 A JP 2016167490A JP 6789039 B2 JP6789039 B2 JP 6789039B2
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reinforced plastic
fiber reinforced
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surface connecting
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孝育 吉井
孝育 吉井
茂治 清水
茂治 清水
有佑 中村
有佑 中村
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Sekisui Chemical Co Ltd
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Description

本発明は、管軸が屈曲又は湾曲した曲管に関し、特に同質曲管に適した曲管に関する。 The present invention relates to a curved pipe having a bent or curved pipe shaft, and particularly to a curved pipe suitable for a homogeneous curved pipe.

例えば特許文献１等に開示されているように、同質曲管は、複数の単位管を含む。各単位管の端面は、自らの軸線に対して斜めをなす傾斜端面となっている。隣接する単位管の傾斜端面どうしが突き当てられることによって、これら単位管どうしが互いに斜めの角度で接合されている。更に、これら単位管の外周面どうし間及び内周面どうし間には、それぞれ積層体が設けられている。各積層体は、樹脂を含浸させた布状体によって構成されている。これによって、単位管どうしの継ぎ目が止水（封止）されている。 For example, as disclosed in Patent Document 1 and the like, a homogeneous curved tube includes a plurality of unit tubes. The end face of each unit pipe is an inclined end face that is oblique to its own axis. By abutting the inclined end faces of adjacent unit pipes, these unit pipes are joined to each other at an oblique angle. Further, a laminated body is provided between the outer peripheral surfaces and the inner peripheral surfaces of these unit pipes, respectively. Each laminate is composed of a cloth-like body impregnated with resin. As a result, the seams between the unit pipes are stopped (sealed).

特開２０１５−１４０８６７号公報JP-A-2015-140867

同質曲管の内周面に関しては、前記積層体の厚みが大きくなると、流下を阻害するため、積層枚数が制限されている。また、上掲特許文献においては、内周面における積層体の布状体としては、無方向のガラスマット等の不織布が用いられている。このため、内周面における積層体は、接合部としての強度が期待できず、耐圧性能が低い。
更に、一般に同質曲管は、原材管を斜めに切断して複数の単位管を得、隣接する２つの単位管のうち一方の単位管を他方の単位管に対して１８０°回転させたうえで、切断端面どうしを突き当てて接合したものであるが、切断面は必ずしも良好でない。このため、接合部に隙間が生じやすく、止水等の封止性を確保するのが容易でない。隙間に樹脂製のパテを充填することもあるが、手作業であるため、仕上がりにばらつきがある。
本発明は、同質曲管等の複数の単位管を連ねた曲管において、単位管どうしの継ぎ目における耐圧性能及び封止性を確保することを目的とする。 Regarding the inner peripheral surface of the homogeneous curved pipe, the number of laminated pipes is limited because the flow is hindered when the thickness of the laminated body is increased. Further, in the above-mentioned patent document, a non-woven fabric such as a non-directional glass mat is used as the cloth-like body of the laminated body on the inner peripheral surface. Therefore, the laminated body on the inner peripheral surface cannot be expected to have strength as a joint portion, and the pressure resistance performance is low.
Further, in a homogeneous curved pipe, a raw material pipe is cut diagonally to obtain a plurality of unit pipes, and one unit pipe of two adjacent unit pipes is rotated 180 ° with respect to the other unit pipe. The cut end faces are abutted against each other and joined, but the cut faces are not always good. For this reason, gaps are likely to occur at the joints, and it is not easy to secure sealing properties such as water stoppage. The gaps may be filled with resin putty, but the finish varies because it is a manual operation.
An object of the present invention is to ensure pressure resistance and sealing performance at joints between unit pipes in a curved pipe in which a plurality of unit pipes such as homogeneous curved pipes are connected.

前記課題を解決するため、本発明に係る曲管は、曲管体と、外面連結材と、内面連結材を備え、
前記曲管体が、複数の単位管を含み、各単位管が自らの軸線に対して斜めをなす傾斜端面を有し、隣接する単位管の傾斜端面どうしが突き当てられ、
前記外面連結材が、隣接する単位管の外周面どうし間に跨って、これら単位管どうしを連接しており、
前記内面連結材が、不織布を強化繊維として含む２つの第１繊維強化プラスチック層と、織布を強化繊維として含み、前記２つの第１繊維強化プラスチック層間に挟まれた１又は２つの第２繊維強化プラスチック層を有し、各繊維強化プラスチック層が、隣接する単位管の内周面どうし間に跨っていることを特徴とする。
これによって、曲管の単位管どうしの継ぎ目における耐圧性能及び封止性を確保することができる。 In order to solve the above problems, the curved pipe according to the present invention includes a curved pipe body, an outer surface connecting material, and an inner surface connecting material.
The curved tube body includes a plurality of unit tubes, each unit tube has an inclined end face that is oblique to its own axis, and the inclined end faces of adjacent unit tubes are abutted against each other.
The outer surface connecting material straddles the outer peripheral surfaces of adjacent unit pipes and connects the unit pipes to each other.
The inner surface connecting material contains two first fiber reinforced plastic layers containing a non-woven fabric as reinforcing fibers and one or two second fibers sandwiched between the two first fiber reinforced plastic layers containing a woven fabric as reinforcing fibers. It has a reinforced plastic layer, and each fiber reinforced plastic layer straddles between the inner peripheral surfaces of adjacent unit tubes.
Thereby, the pressure resistance performance and the sealing property at the joint between the unit pipes of the curved pipe can be ensured.

前記第１、第２繊維強化プラスチック層が、前記曲管体の径方向内側のものほど幅広であることが好ましい。
これによって、内面連結材の幅方向の中央部を厚くできる。通常、内面連結材の幅方向の中央部は、単位管どうしの継ぎ目に位置される。したがって、単位管どうしの継ぎ目における内面連結材の厚みを大きくでき、継ぎ目における耐圧性能及び封止性を十分に確保できる。また、内面連結材の幅方向の両側部の厚みを段階的に小さくでき、曲管内の流れをスムーズにすることができる。 It is preferable that the first and second fiber reinforced plastic layers are wider in the radial direction of the curved tube body.
As a result, the central portion of the inner surface connecting member in the width direction can be thickened. Usually, the central portion of the inner surface connecting member in the width direction is located at the joint between the unit pipes. Therefore, the thickness of the inner surface connecting material at the joint between the unit pipes can be increased, and the pressure resistance performance and the sealing property at the joint can be sufficiently ensured. Further, the thickness of both side portions of the inner surface connecting material in the width direction can be gradually reduced, and the flow in the curved pipe can be smoothed.

前記第２繊維強化プラスチック層が、それより前記内周面側の第１繊維強化プラスチック層より幅狭であり、前記第２繊維強化プラスチック層より前記曲管体の径方向内側の第１繊維強化プラスチック層が、前記内周面側の第１繊維強化プラスチック層より幅広であってもよい。
単位管どうしの継ぎ目においては、内面連結材を、前記内周面側の第１繊維強化プラスチック層と、第２繊維強化プラスチック層と、前記径方向内側の第１繊維強化プラスチック層との積層構造にすることで、継ぎ目における耐圧性能及び封止性を十分に確保できる。更には、第２繊維強化プラスチック層を幅狭にして所要量を減らすことによって、材料費を削減できる。 The width of the second fiber reinforced plastic layer is narrower than that of the first fiber reinforced plastic layer on the inner peripheral surface side thereof, and the first fiber reinforced inside the curved tube body in the radial direction from the second fiber reinforced plastic layer. The plastic layer may be wider than the first fiber reinforced plastic layer on the inner peripheral surface side.
In the joint between the unit pipes, the inner surface connecting material is a laminated structure of the first fiber reinforced plastic layer on the inner peripheral surface side, the second fiber reinforced plastic layer, and the first fiber reinforced plastic layer on the inner side in the radial direction. By setting the temperature, the pressure resistance and the sealing property at the seam can be sufficiently ensured. Furthermore, the material cost can be reduced by narrowing the width of the second fiber reinforced plastic layer to reduce the required amount.

本発明によれば、同質曲管等の曲管において、単位管どうしの継ぎ目における耐圧性能及び封止性を確保できる。 According to the present invention, in a curved pipe such as a homogeneous curved pipe, the pressure resistance performance and the sealing property at the joint between the unit pipes can be ensured.

図１は、本発明の第１実施形態に係る同質曲管の要部を示す平面図である。FIG. 1 is a plan view showing a main part of a homogeneous curved pipe according to the first embodiment of the present invention. 図２は、図１の円部ＩＩの断面図である。FIG. 2 is a cross-sectional view of the circle portion II of FIG. 図３は、本発明の第２実施形態を示し、図２相当の断面図である。FIG. 3 shows a second embodiment of the present invention and is a cross-sectional view corresponding to FIG. 図４は、本発明の第３実施形態を示し、図２相当の断面図である。FIG. 4 shows a third embodiment of the present invention and is a cross-sectional view corresponding to FIG.

以下、本発明の実施形態を図面にしたがって説明する。
＜第１実施形態＞
図１及び図２は、本発明の第１実施形態を示したものである。図１に示すように、同質曲管２（曲管）は、例えば下水道管や農業用水管等として提供される。同質曲管２は、例えば原材管を斜めに切断して複数の単位管１１を得、隣接する２つの単位管１１のうち一方の単位管１１を他方の単位管１１に対して１８０°回転させたうえで、切断端面１１ｅどうしを突き当てて連接したものである。これによって、同質曲管２の管軸が、所定角度曲げられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
1 and 2 show the first embodiment of the present invention. As shown in FIG. 1, the homogeneous curved pipe 2 (curved pipe) is provided as, for example, a sewer pipe, an agricultural water pipe, or the like. In the homogeneous curved pipe 2, for example, a raw material pipe is cut diagonally to obtain a plurality of unit pipes 11, and one of the two adjacent unit pipes 11 is rotated by 180 ° with respect to the other unit pipe 11. The cut end faces 11e are abutted against each other and connected to each other. As a result, the tube shaft of the homogeneous curved tube 2 is bent by a predetermined angle.

詳しくは、同質曲管２は、曲管体１０と、外面連結材２０を備えている。曲管体１０は、複数（図１においては３つだけ図示）の単位管１１を含む。各単位管１１ひいては曲管体１０は、繊維強化プラスチック管（ＦＲＰ管）や繊維強化プラスチック複合管（ＦＲＰＭ管）等の硬質樹脂管によって構成されている。ＦＲＰ管やＦＲＰＭ管は、フィラメントワインディング成形法によって作製されていてもよい。 Specifically, the homogeneous curved tube 2 includes a curved tube body 10 and an outer surface connecting member 20. The curved tube body 10 includes a plurality of unit tubes 11 (only three are shown in FIG. 1). Each unit pipe 11 and thus the curved pipe body 10 is composed of a hard resin pipe such as a fiber reinforced plastic pipe (FRP pipe) and a fiber reinforced plastic composite pipe (FRPM pipe). The FRP tube and FRPM tube may be manufactured by a filament winding molding method.

図１に示すように、複数の単位管１１が一列に連ねられている。各単位管１１の少なくとも片側の端面１１ｅは、当該単位管１１の軸線に対して斜めになっている。隣接する単位管１１の傾斜端面１１ｅどうしが突き当てられている。 As shown in FIG. 1, a plurality of unit tubes 11 are arranged in a row. The end surface 11e on at least one side of each unit tube 11 is oblique with respect to the axis of the unit tube 11. The inclined end faces 11e of the adjacent unit pipes 11 are abutted against each other.

曲管体１０における隣接する単位管１１どうしの間にそれぞれ外面連結材２０が配置されている。外面連結材２０は、繊維強化プラスチック（ＦＲＰ）によって構成されている。詳しくは、図２に示すように、外面連結材２０は、布状体２１（強化繊維）と、充填樹脂２２を含む。布状体２１の材質としては、ガラス繊維のほか、炭素繊維、アラミド繊維等が挙げられる。布状体２１は、ロービングクロス等の織布であってもよく、ガラスマット等の不織布（無方向の布状体）であってもよい。図２における布状体２１は、作図の便宜上、模式的に図示されている。充填樹脂２２が布状体２１に含浸されている。充填樹脂２２の成分としては、不飽和ポリエステル樹脂、エポキシ樹脂、ビニルエステル樹脂等が挙げられる。 The outer surface connecting member 20 is arranged between the adjacent unit pipes 11 in the curved pipe body 10. The outer surface connecting material 20 is made of fiber reinforced plastic (FRP). Specifically, as shown in FIG. 2, the outer surface connecting material 20 includes a cloth-like body 21 (reinforcing fiber) and a filling resin 22. Examples of the material of the cloth-like body 21 include carbon fiber, aramid fiber, and the like, in addition to glass fiber. The cloth-like body 21 may be a woven cloth such as a roving cloth, or a non-woven fabric (non-directional cloth-like body) such as a glass mat. The cloth-like body 21 in FIG. 2 is schematically shown for convenience of drawing. The cloth-like body 21 is impregnated with the filling resin 22. Examples of the component of the filling resin 22 include unsaturated polyester resin, epoxy resin, vinyl ester resin and the like.

図１に示すように、外面連結材２０は、隣接する単位管１１の外周面どうし間に跨るとともに、各単位管１１の周方向に環状に巻かれている。充填樹脂２２が、塗布時ないしは未硬化時の接着性によって曲管体１０に接着されている。外面連結材２０を介して、隣接する単位管１１どうしが連結されている。同質曲管２の外周り部分２ｏにおいては、隣接する外面連結材２０どうしが離間されている。同質曲管２の内周り部分２ｉにおいては、隣接する外面連結材２０どうしが外周り部分２ｏよりも接近されている。なお、内周り部分２ｉにおいて、隣接する外面連結材２０どうしが少し重なり、若しくは互いに連なっていてもよい。 As shown in FIG. 1, the outer surface connecting member 20 straddles between the outer peripheral surfaces of adjacent unit pipes 11 and is wound in an annular shape in the circumferential direction of each unit pipe 11. The filling resin 22 is adhered to the curved tube body 10 due to the adhesiveness at the time of application or uncured. Adjacent unit pipes 11 are connected to each other via an outer surface connecting member 20. In the outer peripheral portion 2o of the homogeneous curved pipe 2, the adjacent outer surface connecting members 20 are separated from each other. In the inner peripheral portion 2i of the homogeneous curved pipe 2, the adjacent outer surface connecting members 20 are closer to each other than the outer peripheral portion 2o. In the inner peripheral portion 2i, the adjacent outer surface connecting members 20 may slightly overlap each other or may be connected to each other.

同質曲管２の要求耐圧等に応じて、外面連結材２０の厚み、ないしは布状体２１の積層枚数が設定されている。同質曲管２の要求耐圧（内圧）は、例えば０．５ＭＰａ程度である。それ以上の耐圧性を要求される場合は、布状体２１の積層枚数を増やすことで対応できる。 The thickness of the outer surface connecting member 20 or the number of laminated cloth-like bodies 21 is set according to the required pressure resistance of the homogeneous curved tube 2. The required withstand voltage (internal pressure) of the homogeneous curved tube 2 is, for example, about 0.5 MPa. When a pressure resistance higher than that is required, it can be dealt with by increasing the number of laminated cloth-like bodies 21.

図２に示すように、一般に同質曲管においては、単位管１１の傾斜端面１１ｅの切断精度や自重による変形等によって、単位管１１どうし間に隙間１０ｅが生じている場合がある。その場合、外面連結材２０によって隙間１０ｅを外周側から塞ぐことができる。 As shown in FIG. 2, in a homogeneous curved pipe, a gap 10e may be formed between the unit pipes 11 due to the cutting accuracy of the inclined end surface 11e of the unit pipe 11 or the deformation due to its own weight. In that case, the gap 10e can be closed from the outer peripheral side by the outer surface connecting member 20.

更に、本発明形態の同質曲管２においては、図２に示すように、曲管体１０の内周に内面連結材５０が設けられている。内面連結材５０は、２つの第１繊維強化プラスチック層５１と、１つの第２繊維強化プラスチック層５２を備えている。第１繊維強化プラスチック層５１は、不織布５１ａ（強化繊維）と、第１充填樹脂５１ｂを含む。不織布５１ａとしては、例えば無方向のガラス繊維布状体（マット、サーフェイスマット等）が用いられている。ガラス繊維に代えて、炭素繊維やアラミド繊維を用いてもよい。図２における不織布５１ａは、作図の便宜上、模式的に図示されている。第１充填樹脂５１ｂが不織布５１ａに含浸されている。第１充填樹脂５１ｂの成分としては、不飽和ポリエステル樹脂、エポキシ樹脂、ビニルエステル樹脂等が挙げられる。 Further, in the homogeneous curved pipe 2 of the present invention, as shown in FIG. 2, an inner surface connecting member 50 is provided on the inner circumference of the curved pipe body 10. The inner surface connecting member 50 includes two first fiber reinforced plastic layers 51 and one second fiber reinforced plastic layer 52. The first fiber reinforced plastic layer 51 contains a non-woven fabric 51a (reinforcing fiber) and a first filling resin 51b. As the non-woven fabric 51a, for example, a non-directional glass fiber cloth-like body (mat, surface mat, etc.) is used. Instead of glass fiber, carbon fiber or aramid fiber may be used. The non-woven fabric 51a in FIG. 2 is schematically shown for convenience of drawing. The first filled resin 51b is impregnated in the non-woven fabric 51a. Examples of the component of the first filling resin 51b include unsaturated polyester resin, epoxy resin, vinyl ester resin and the like.

第２繊維強化プラスチック層５２は、織布５２ａ（強化繊維）と、第２充填樹脂５２ｂを含む。織布５２ａとしては、例えば、ガラス繊維の織物（ロービングクロス、ガラスクロス等）が用いられている。ガラス繊維に代えて、炭素繊維やアラミド繊維を用いてもよい。図２における織布５２ａは、作図の便宜上、模式的に図示されている。第２充填樹脂５２ｂが織布５２ａに含浸されている。第２充填樹脂５２ｂの成分としては、不飽和ポリエステル樹脂、エポキシ樹脂、ビニルエステル樹脂等が挙げられる。 The second fiber reinforced plastic layer 52 contains a woven fabric 52a (reinforcing fiber) and a second filling resin 52b. As the woven fabric 52a, for example, a glass fiber woven fabric (roving cloth, glass cloth, etc.) is used. Instead of glass fiber, carbon fiber or aramid fiber may be used. The woven fabric 52a in FIG. 2 is schematically shown for convenience of drawing. The woven fabric 52a is impregnated with the second filling resin 52b. Examples of the component of the second filling resin 52b include unsaturated polyester resin, epoxy resin, vinyl ester resin and the like.

各繊維強化プラスチック層５１，５２は、曲管体１０の内周面の周方向に沿って環状になっている。１層目（図２において上側）の第１繊維強化プラスチック層５１が、単位管１１の内周面に直接積層されている。１層目の第１繊維強化プラスチック層５１に第２繊維強化プラスチック層５２が積層されている。第２繊維強化プラスチック層５２にもう１つ（３層目）の第１繊維強化プラスチック層５１が積層されている。したがって、２つの第１繊維強化プラスチック層５１間に１つの第２繊維強化プラスチック層５２が挟まれている。 The fiber-reinforced plastic layers 51 and 52 have an annular shape along the circumferential direction of the inner peripheral surface of the curved tube body 10. The first fiber-reinforced plastic layer 51 of the first layer (upper side in FIG. 2) is directly laminated on the inner peripheral surface of the unit tube 11. The second fiber reinforced plastic layer 52 is laminated on the first fiber reinforced plastic layer 51 of the first layer. Another (third layer) first fiber reinforced plastic layer 51 is laminated on the second fiber reinforced plastic layer 52. Therefore, one second fiber reinforced plastic layer 52 is sandwiched between the two first fiber reinforced plastic layers 51.

各繊維強化プラスチック層５１，５２は、隣接する単位管１１の内周面どうし間に跨っている。ひいては、内面連結材５０が、隣接する単位管１１の内周面どうし間に跨っている。充填樹脂５１ｂ，５２ｂの塗布時ないしは未硬化時の接着性によって、１層目の第１繊維強化プラスチック層５１が曲管体１０に接着されるとともに、繊維強化プラスチック層５１，５２どうしが互いに接合されている。 The fiber-reinforced plastic layers 51 and 52 straddle the inner peripheral surfaces of the adjacent unit pipes 11. As a result, the inner surface connecting member 50 straddles the inner peripheral surfaces of the adjacent unit pipes 11. Due to the adhesiveness of the filled resins 51b and 52b when applied or uncured, the first fiber-reinforced plastic layer 51 of the first layer is adhered to the curved tube body 10, and the fiber-reinforced plastic layers 51 and 52 are bonded to each other. Has been done.

第１、第２繊維強化プラスチック層５１，５２は、曲管体１０の径方向内側（図２において下側）のものほど幅広になっている。すなわち、２層目（中間）の第２繊維強化プラスチック層５２の幅Ｗ５２は、１層目（曲管体１０の内周面側）の第１繊維強化プラスチック層５１の幅Ｗ５１よりも大きい（Ｗ５２＞Ｗ５１）。第２繊維強化プラスチック層５２の幅方向（図２において左右）の両端部が１層目の第１繊維強化プラスチック層５１よりも延び出ている。３層目の第１繊維強化プラスチック層５１の幅Ｗ５３は、２層目の第２繊維強化プラスチック層５２の幅Ｗ５２よりも大きい（Ｗ５３＞Ｗ５２）。３層目の第１繊維強化プラスチック層５１の幅方向（図２において左右）の両端部が第２繊維強化プラスチック層５２よりも延び出ている。内面連結材５０全体として、幅方向の中央部が厚肉になり、幅方向の両側部は段階的に薄肉になっている。
例えば、Ｗ５１＝１５０ｍｍ程度、Ｗ５２＝２００ｍｍ程度、Ｗ５３＝２５０ｍｍ程度であるが、本発明がこれに限られるものではない。 The first and second fiber reinforced plastic layers 51 and 52 are wider toward the inner side (lower side in FIG. 2) of the curved tube body 10 in the radial direction. That is, the width W 52 of the second fiber reinforced plastic layer 52 of the second layer (intermediate) is wider than the width W 51 of the first fiber reinforced plastic layer 51 of the first layer (inner peripheral surface side of the curved tube body 10). Large (W 52 > W 51 ). Both ends of the second fiber reinforced plastic layer 52 in the width direction (left and right in FIG. 2) extend beyond the first fiber reinforced plastic layer 51 of the first layer. The width W 53 of the first fiber reinforced plastic layer 51 of the third layer is larger than the width W 52 of the second fiber reinforced plastic layer 52 of the second layer (W 53 > W 52 ). Both ends of the third fiber-reinforced plastic layer 51 in the width direction (left and right in FIG. 2) extend beyond the second fiber-reinforced plastic layer 52. As a whole of the inner surface connecting member 50, the central portion in the width direction is thickened, and both side portions in the width direction are gradually thinned.
For example, W 51 = about 150 mm, W 52 = about 200 mm, and W 53 = about 250 mm, but the present invention is not limited thereto.

同質曲管２によれば、隣接する単位管１１どうしを、外面連結材２０によって外周側から連結できるとともに、内面連結材５０によって内周側からも連結することができる。これによって、単位管１１の連結強度を高めることができる。ひいては、同質曲管２の内圧に対する耐圧性能を向上できる。
更に、単位管１１どうしの継ぎ目に隙間１０ｅが形成されていた場合、外面連結材２０によって隙間１０ｅを外周側から塞ぐことができるだけでなく、内面連結材５０によって隙間１０ｅを外周側から塞ぐことができる。これによって、単位管１１どうしの継ぎ目における水密性（封止性）を確保できる。特に、２つの第１繊維強化プラスチック層５１の間に第２繊維強化プラスチック層５２を挟むことによって、水密性を十分に確保することができる。この結果、同質曲管２の止水性（封止性）を高めることができる。 According to the homogeneous curved pipe 2, adjacent unit pipes 11 can be connected to each other from the outer peripheral side by the outer surface connecting material 20 and also from the inner peripheral side by the inner surface connecting material 50. Thereby, the connection strength of the unit tube 11 can be increased. As a result, the pressure resistance performance of the homogeneous curved tube 2 with respect to the internal pressure can be improved.
Further, when the gap 10e is formed at the joint between the unit pipes 11, not only the gap 10e can be closed from the outer peripheral side by the outer surface connecting member 20, but also the gap 10e can be closed from the outer peripheral side by the inner surface connecting member 50. it can. As a result, watertightness (sealing property) at the joint between the unit tubes 11 can be ensured. In particular, by sandwiching the second fiber reinforced plastic layer 52 between the two first fiber reinforced plastic layers 51, sufficient watertightness can be ensured. As a result, the water stopping property (sealing property) of the homogeneous curved tube 2 can be improved.

なお、従来においては、隙間１０ｅが生じた場合は、樹脂製のパテによって塞いでいたが、パテ自体の強度は期待できず、かつ手作業であるために仕上りにばらつきが出やすい。
これに対し、同質曲管２によれば、２つの第１繊維強化プラスチック層５１の間に第２繊維強化プラスチック層５２を挟むことによって、内面連結材５０の強度を高めることができ、ひいては単位管１１どうしの連結強度を高めることができる。また、内面連結材５０の幅方向の中央部の厚みを大きくすることによって、継ぎ目における耐圧性能及び封止性を十分に確保できるとともに、内面連結材５０の幅方向の両側部の厚みを段階的に小さくすることによって滑らかさを出すことができ、同質曲管２内を水等の流体がスムーズに流れるようにすることができる。 In the past, when the gap 10e was generated, it was closed with a putty made of resin, but the strength of the putty itself cannot be expected, and since it is a manual operation, the finish tends to vary.
On the other hand, according to the homogeneous curved tube 2, the strength of the inner surface connecting material 50 can be increased by sandwiching the second fiber reinforced plastic layer 52 between the two first fiber reinforced plastic layers 51, and by extension, the unit. The connection strength between the tubes 11 can be increased. Further, by increasing the thickness of the central portion of the inner surface connecting member 50 in the width direction, sufficient pressure resistance performance and sealing performance at the seam can be sufficiently ensured, and the thickness of both side portions of the inner surface connecting member 50 in the width direction is gradually increased. Smoothness can be obtained by making the size smaller, and a fluid such as water can flow smoothly in the homogeneous curved pipe 2.

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。
＜第２実施形態＞
図３は、本発明の第２実施形態を示したものである。第２実施形態の内面連結材５０Ｂにおいては、２層目（中間）の第２繊維強化プラスチック層５２の幅Ｗ５２が、１層目（曲管体１０の内周面側、図３において上側）の第１繊維強化プラスチック層５１の幅Ｗ５１よりも小さい（Ｗ５２＜Ｗ５１）。３層目（径方向内側、図３において下側）の第１繊維強化プラスチック層５１の幅Ｗ５３は、１層目の第１繊維強化プラスチック層５１の幅Ｗ５１より大きい（Ｗ５３＞Ｗ５１）。
例えば、Ｗ５１＝１５０ｍｍ程度、Ｗ５２＝１００ｍｍ程度、Ｗ５３＝２５０ｍｍ程度であるが、本発明がこれに限られるものではない。 Next, other embodiments of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for configurations that overlap with the above-described embodiments, and the description thereof will be omitted.
<Second Embodiment>
FIG. 3 shows a second embodiment of the present invention. In the inner surface connecting material 50B of the second embodiment, the width W 52 of the second fiber reinforced plastic layer 52 of the second layer (intermediate) is the first layer (inner peripheral surface side of the curved tube body 10, upper side in FIG. 3). ) Is smaller than the width W 51 of the first fiber reinforced plastic layer 51 (W 52 <W 51 ). The width W 53 of the first fiber reinforced plastic layer 51 of the third layer (inner in the radial direction, lower in FIG. 3) is larger than the width W 51 of the first fiber reinforced plastic layer 51 of the first layer (W 53 > W). 51 ).
For example, W 51 = about 150 mm, W 52 = about 100 mm, and W 53 = about 250 mm, but the present invention is not limited thereto.

幅狭の第２繊維強化プラスチック層５２は、隣接する単位管１１間に跨るように配置されている。単位管１１どうしの継ぎ目の近傍部においては、１層目の第１繊維強化プラスチック層５１と、２層目の第２繊維強化プラスチック層５２と、３層目の第１繊維強化プラスチック層５１との３層構造になっている。よって、単位管１１どうしの継ぎ目における水密性を十分に確保できる。かつ、単位管１１どうしの連結強度を確保できる。
更には、第２繊維強化プラスチック層５２の所要量が減るために、材料費を削減できる。 The narrow second fiber reinforced plastic layer 52 is arranged so as to straddle between the adjacent unit pipes 11. In the vicinity of the joint between the unit tubes 11, the first fiber-reinforced plastic layer 51 of the first layer, the second fiber-reinforced plastic layer 52 of the second layer, and the first fiber-reinforced plastic layer 51 of the third layer It has a three-layer structure. Therefore, sufficient watertightness can be ensured at the joint between the unit pipes 11. Moreover, the connection strength between the unit tubes 11 can be secured.
Further, since the required amount of the second fiber reinforced plastic layer 52 is reduced, the material cost can be reduced.

＜第３実施形態＞
図４は、本発明の第３実施形態を示したものである。第３実施形態においては、内面連結材５０Ｃが、２つの第１繊維強化プラスチック層５１と、２つの第２繊維強化プラスチック層５２を含む。１層目（図４において上側）の第１繊維強化プラスチック層５１が、単位管１１の内周面に直接積層されている。１層目の第１繊維強化プラスチック層５１に２層目の第２繊維強化プラスチック層５２が積層されている。２層目の第２繊維強化プラスチック層５２にもう１つ（３層目）の第２繊維強化プラスチック層５２が積層されている。３層目の第２繊維強化プラスチック層５２にもう１つ（４層目）の第１繊維強化プラスチック層５１が積層されている。
第３実施形態によれば、内面連結材５０Ｃを４層構造にすることによって、単位管１１どうしの継ぎ目における水密性を一層高めることができ、更には、単位管１１どうしの連結強度を一層高めることができる。 <Third Embodiment>
FIG. 4 shows a third embodiment of the present invention. In the third embodiment, the inner surface connecting material 50C includes two first fiber reinforced plastic layers 51 and two second fiber reinforced plastic layers 52. The first fiber-reinforced plastic layer 51 of the first layer (upper side in FIG. 4) is directly laminated on the inner peripheral surface of the unit tube 11. A second fiber reinforced plastic layer 52 is laminated on the first fiber reinforced plastic layer 51 of the first layer. Another (third layer) second fiber reinforced plastic layer 52 is laminated on the second fiber reinforced plastic layer 52 of the second layer. Another (fourth layer) first fiber reinforced plastic layer 51 is laminated on the second fiber reinforced plastic layer 52 of the third layer.
According to the third embodiment, by forming the inner surface connecting member 50C into a four-layer structure, the watertightness at the joint between the unit pipes 11 can be further enhanced, and further, the connecting strength between the unit pipes 11 is further enhanced. be able to.

本発明は、前記実施形態に限定されるものではなく、その趣旨を逸脱しない範囲において種々の改変をなすことができる。
例えば、２以上の第１繊維強化プラスチック層５１と２以上の第２繊維強化プラスチック層５２を交互に積層してもよい。第１、第２繊維強化プラスチック層５１，５２の幅が互いに等しくてもよい。
本発明は、同質曲管に限られず、湾曲又は屈曲された種々の曲管に適当可能である。 The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, two or more first fiber reinforced plastic layers 51 and two or more second fiber reinforced plastic layers 52 may be alternately laminated. The widths of the first and second fiber reinforced plastic layers 51 and 52 may be equal to each other.
The present invention is not limited to homogeneous curved pipes, and is suitable for various curved or bent curved pipes.

本発明は、例えば下水道管や農業用水管に適用できる。 The present invention can be applied to, for example, sewer pipes and agricultural water pipes.

２ 同質曲管（曲管）
２ｉ 内周り部分
２ｏ 外周り部分
１０ 曲管体
１０ｅ 隙間
１１ 単位管
１１ｅ 傾斜端面
２０ 外面連結材
２１ 布状体
２２ 充填樹脂
５０，５０Ｂ，５０Ｃ 内面連結材
５１ 第１繊維強化プラスチック層
５１ａ 不織布（強化繊維）
５１ｂ 第１充填樹脂
５２ 第２繊維強化プラスチック層
５２ａ 織布（強化繊維）
５２ｂ 第２充填樹脂 2 Homogeneous curved pipe (curved pipe)
2i Inner circumference 2o Outer circumference 10 Curved tube body 10e Gap 11 Unit tube 11e Inclined end face 20 Outer surface connecting material 21 Cloth-like body 22 Filling resin 50, 50B, 50C Inner surface connecting material 51 First fiber reinforced plastic layer 51a Non-woven fabric (reinforced) fiber)
51b 1st filling resin 52 2nd fiber reinforced plastic layer 52a Woven fabric (reinforced fiber)
52b 2nd filling resin

Claims (3)

曲管体と、外面連結材と、内面連結材を備え、水を流す曲管であって、
前記曲管体が、複数の単位管を含み、各単位管が自らの軸線に対して斜めをなす傾斜端面を有し、隣接する単位管の傾斜端面どうしが突き当てられ、
前記外面連結材が、隣接する単位管の外周面どうし間に跨って、これら単位管どうしを連接しており、
前記内面連結材が、不織布を強化繊維として含む１層目及び３層目の２つの第１繊維強化プラスチック層と、織布を強化繊維として含み、前記２つの第１繊維強化プラスチック層間に挟まれた２層目の１つの第２繊維強化プラスチック層を有する三層構造であり、各繊維強化プラスチック層が、隣接する単位管の内周面どうし間に跨っており、１層目の第１繊維強化プラスチック層が前記曲管体の内面に直接積層され、３層目の第１繊維強化プラスチック層が前記曲管体の管内空間に面していることを特徴とする曲管。 It is a curved pipe that has a curved pipe body, an outer surface connecting material, and an inner surface connecting material, and allows water to flow.
The curved tube body includes a plurality of unit tubes, each unit tube has an inclined end face that is oblique to its own axis, and the inclined end faces of adjacent unit tubes are abutted against each other.
The outer surface connecting material straddles the outer peripheral surfaces of adjacent unit pipes and connects the unit pipes to each other.
The inner surface connecting material contains two first fiber reinforced plastic layers of the first layer and the third layer containing a non-woven fabric as reinforcing fibers and a woven fabric as reinforcing fibers, and is sandwiched between the two first fiber reinforced plastic layers. and a three-layer structure in which it has a second fiber-reinforced plastic layer of one of the second layer, the fiber-reinforced plastic layer, straddles between the inner circumferential surface each other of the adjacent unit pipe, the first first layer A curved tube in which a fiber reinforced plastic layer is directly laminated on the inner surface of the curved tube body, and a third layer of the first fiber reinforced plastic layer faces the inner surface of the curved tube body . 前記第１、第２繊維強化プラスチック層が、前記曲管体の径方向内側のものほど幅広であることを特徴とする請求項１に記載の曲管。 The curved tube according to claim 1, wherein the first and second fiber reinforced plastic layers are wider toward the inner side in the radial direction of the curved tube body. 曲管体と、外面連結材と、内面連結材を備え、
前記曲管体が、複数の単位管を含み、各単位管が自らの軸線に対して斜めをなす傾斜端面を有し、隣接する単位管の傾斜端面どうしが突き当てられ、
前記外面連結材が、隣接する単位管の外周面どうし間に跨って、これら単位管どうしを連接しており、
前記内面連結材が、不織布を強化繊維として含む２つの第１繊維強化プラスチック層と、織布を強化繊維として含み、前記２つの第１繊維強化プラスチック層間に挟まれた１又は２つの第２繊維強化プラスチック層を有し、各繊維強化プラスチック層が、隣接する単位管の内周面どうし間に跨っており、
前記第２繊維強化プラスチック層が、それより前記内周面側の第１繊維強化プラスチック層より幅狭であり、
前記第２繊維強化プラスチック層より前記曲管体の径方向内側の第１繊維強化プラスチック層が、前記内周面側の第１繊維強化プラスチック層より幅広であることを特徴とする曲管。 Equipped with a curved tube body, an outer surface connecting material, and an inner surface connecting material,
The curved tube body includes a plurality of unit tubes, each unit tube has an inclined end face that is oblique to its own axis, and the inclined end faces of adjacent unit tubes are abutted against each other.
The outer surface connecting material straddles the outer peripheral surfaces of adjacent unit pipes and connects the unit pipes to each other.
The inner surface connecting material contains two first fiber reinforced plastic layers containing a non-woven fabric as reinforcing fibers and one or two second fibers sandwiched between the two first fiber reinforced plastic layers containing a woven fabric as reinforcing fibers. It has a reinforced plastic layer, and each fiber reinforced plastic layer straddles the inner peripheral surfaces of adjacent unit tubes.
The second fiber reinforced plastic layer is narrower than the first fiber reinforced plastic layer on the inner peripheral surface side thereof.
A curved tube characterized in that the first fiber reinforced plastic layer radially inside the curved tube body from the second fiber reinforced plastic layer is wider than the first fiber reinforced plastic layer on the inner peripheral surface side.
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