JP2017009072A - Composite tube - Google Patents

Composite tube Download PDF

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JP2017009072A
JP2017009072A JP2015126693A JP2015126693A JP2017009072A JP 2017009072 A JP2017009072 A JP 2017009072A JP 2015126693 A JP2015126693 A JP 2015126693A JP 2015126693 A JP2015126693 A JP 2015126693A JP 2017009072 A JP2017009072 A JP 2017009072A
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corrugated
layer
pipe
main pipe
peripheral surface
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JP6636271B2 (en
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浩平 三觜
Kohei Mitsuhashi
浩平 三觜
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Bridgestone Corp
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Bridgestone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a composite tube capable of suppressing a sound generated when hitting against another tube and capable of improving workability of a corrugated layer.SOLUTION: A composite tube 1 of the present invention comprises a main part 2, and a resin corrugated layer 4 arranged on the outer peripheral side of the main part and comprising a corrugated tube wall in which an annular large-diameter part 41 and an annular small-diameter part 42 smaller in dimeter than the annular large-diameter part are alternately arranged in an axial direction. The layer thickness of the corrugated layer is in the range of 80-200 μm.SELECTED DRAWING: Figure 1

Description

この発明は、例えば給水又は給湯用の配管等に用いられる複合管に関するものである。   The present invention relates to a composite pipe used for piping for water supply or hot water supply, for example.

給水又は給湯用の管（以下、「本管」ともいう。）は、本管の傷からの保護や保温のために、樹脂製のコルゲート管（例えば、特許文献１）により覆われた状態で使用されることがある。その場合、施工現場において、作業員によって本管が管継手に接続される際には、本管の端部を覆うコルゲート管の端部が軸線方向に縮められることによって本管の端部が外部に露出され、外部に露出した本管の端部が管継手に接続される。そして、本管が管継手に接続された後は、いったん縮められたコルゲート管の端部が軸線方向に引き伸ばされることによって元に戻されて、本管が外部に露出しないようにされる。   A pipe for water supply or hot water supply (hereinafter also referred to as “main pipe”) is covered with a resin corrugated pipe (for example, Patent Document 1) in order to protect the main pipe from scratches and keep warm. Sometimes used. In that case, at the construction site, when the main pipe is connected to the pipe joint by an operator, the end of the main pipe is externally contracted by contracting the end of the corrugated pipe covering the end of the main pipe in the axial direction. The end of the main pipe exposed to the outside and connected to the outside is connected to the pipe joint. Then, after the main pipe is connected to the pipe joint, the end portion of the corrugated pipe once contracted is returned to the original position by being stretched in the axial direction, so that the main pipe is not exposed to the outside.

特開2015-48909号公報JP-A-2015-48909

しかしながら、従来のコルゲート管は、他の管に隣接して配設された場合に、例えばいずれか一方の管がウォーターハンマーによって振動する等して、コルゲート管が該他の管に当たったときに、比較的大きな音が生じてしまうという問題があった。
また、従来のコルゲート管は、作業性が良くないという問題があった。例えば、本管が管継手に接続される際における、上述したようなコルゲート管を縮めたり元に戻したりする作業が、容易ではなかった。また、本管が管継手に接続された後に、いったん縮められたコルゲート管が、十分に元に戻らない場合もあり、そのような場合、本管が部分的に外部に露出したままとなってしまって、施工後の状態の見栄えを損ねていた。 However, when a conventional corrugated tube is disposed adjacent to another tube, for example, when one of the tubes is vibrated by a water hammer, the corrugated tube hits the other tube. There was a problem that a relatively loud sound was produced.
Further, the conventional corrugated pipe has a problem that workability is not good. For example, when the main pipe is connected to the pipe joint, it is not easy to shrink or restore the corrugated pipe as described above. In addition, after the main pipe is connected to the pipe joint, the corrugated pipe once shrunk may not be fully restored. In such a case, the main pipe remains partially exposed to the outside. It wasn't good for the appearance after construction.

この発明は、上述した課題を解決するためのものであり、他の管に当たったときに発生する音を抑制でき、また、コルゲート層の作業性を向上できる、複合管を提供することを目的とするものである。   An object of the present invention is to solve the above-described problem, and to provide a composite pipe that can suppress sound generated when it hits another pipe and can improve the workability of a corrugated layer. It is what.

本発明の複合管は、本管部と、前記本管部の外周側に配置され、環状大径部と前記環状大径部よりも小径の環状小径部とが軸線方向に交互に配置されてなる波形の管壁からなる、樹脂製のコルゲート層と、を備え、前記コルゲート層の層厚が８０〜２００μｍであることを特徴とする。
この発明の複合管によれば、他の管（本発明の複合管も含む。）に当たったときに発生する音を抑制でき、また、コルゲート層の作業性を向上できる。 The composite pipe of the present invention is arranged on the outer peripheral side of the main pipe part and the main pipe part, and the annular large diameter part and the annular small diameter part smaller in diameter than the annular large diameter part are alternately arranged in the axial direction. A corrugated layer made of a resin having a corrugated tube wall, wherein the corrugated layer has a thickness of 80 to 200 μm.
According to the composite pipe of the present invention, it is possible to suppress the sound generated when it hits another pipe (including the composite pipe of the present invention) and to improve the workability of the corrugated layer.

本発明の複合管は、前記本管部と前記コルゲート層との間に、緩衝材により構成される緩衝層をさらに備えると、好適である。これによれば、本管部の外周面とコルゲート層の内周面とが当たったときに発生する音を抑制できる。   The composite pipe of the present invention is preferably provided with a buffer layer made of a buffer material between the main pipe part and the corrugated layer. According to this, the sound which generate | occur | produces when the outer peripheral surface of a main pipe part and the inner peripheral surface of a corrugated layer hit can be suppressed.

本発明の複合管において、前記緩衝層の内周面は前記本管部の外周面に直接接し、前記軸線方向に沿って延びていると、好適である。これによれば、コルゲート層の作業性をさらに向上できる。   In the composite pipe of the present invention, it is preferable that the inner peripheral surface of the buffer layer is in direct contact with the outer peripheral surface of the main pipe portion and extends along the axial direction. According to this, the workability of the corrugated layer can be further improved.

この発明によれば、他の管に当たったときに発生する音を抑制でき、また、コルゲート層の作業性を向上できる、複合管を提供できる。   According to the present invention, it is possible to provide a composite pipe that can suppress sound generated when it hits another pipe and can improve the workability of the corrugated layer.

本発明の複合管の一実施形態を示す一部断面側面図である。It is a partial cross section side view which shows one Embodiment of the composite pipe | tube of this invention. 本発明の複合管の一実施形態の一変形例を示す一部断面側面図である。It is a partial cross section side view which shows one modification of one Embodiment of the composite pipe | tube of this invention. 本発明の複合管の一実施形態の他の変形例を示す一部断面側面図である。It is a partial cross section side view which shows the other modification of one Embodiment of the composite pipe | tube of this invention.

以下に、図面を参照しつつ、この発明に係る複合管の実施形態を例示説明する。   Hereinafter, embodiments of a composite pipe according to the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態に係る複合管１を示している。本実施形態の複合管１は、給水又は給湯用の配管に好適に用いられるものである。ただし、複合管１は、水以外の流体（液体や気体）用の配管にも使用できる。本実施形態の複合管１は、本管部２と、本管部２の外周側に配置されたコルゲート層４と、本管部２とコルゲート層４との間に配置された緩衝層３と、を備えている。
なお、図１は、本実施形態の複合管１の一部を、複合管１の中心軸線Ｏに沿う断面によって示している。複合管１の中心軸線Ｏは、コルゲート層４の中心軸線と同じとする。複合管１の軸線方向は、中心軸線Ｏに沿う方向とする。 FIG. 1 shows a composite tube 1 according to an embodiment of the present invention. The composite pipe 1 of this embodiment is suitably used for water supply or hot water supply pipes. However, the composite pipe 1 can also be used for piping for fluids (liquid or gas) other than water. The composite pipe 1 of this embodiment includes a main pipe part 2, a corrugated layer 4 arranged on the outer peripheral side of the main pipe part 2, and a buffer layer 3 arranged between the main pipe part 2 and the corrugated layer 4. It is equipped with.
FIG. 1 shows a part of the composite tube 1 of the present embodiment by a cross section along the central axis O of the composite tube 1. The central axis O of the composite pipe 1 is the same as the central axis of the corrugated layer 4. The axial direction of the composite pipe 1 is a direction along the central axis O.

本管部２は、例えばポリブテン又は架橋ポリエチレン（ＰＥＸ）等の熱可塑性樹脂からなる、可撓性のある樹脂管である。本例において、本管部２は、その全長にわたって円筒状に構成されており、その外径は軸線方向に沿って一定である。本管部２の呼び径は、例えば１０〜２５等（例えば、ポリブテン管であればＪＩＳＫ６７７８及びＪＩＳＫ６７９２に定められるＪ種管の呼び径であり、PEXであればＪＩＳＫ６７６９に定められる呼び径）である。   The main pipe part 2 is a flexible resin pipe made of a thermoplastic resin such as polybutene or crosslinked polyethylene (PEX). In this example, the main pipe portion 2 is formed in a cylindrical shape over its entire length, and its outer diameter is constant along the axial direction. The nominal diameter of the main pipe section 2 is, for example, 10 to 25 or the like (for example, the nominal diameter of the J-type pipe defined in JISK6778 and JISK6792 for polybutene pipes, and the nominal diameter defined in JISK6769 for PEX). .

コルゲート層４は、例えばポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリアミド繊維（ＰＡ）等の樹脂から形成されており、本例では径方向（軸線方向に対して垂直な方向。以下同じ。）の断面において円形に形成されている。コルゲート層４は、環状大径部４１と環状大径部４１よりも小径の環状小径部４２とが軸線方向に交互に配置されてなる波形の管壁からなる。図１の例では、コルゲート層４の層厚（管壁の肉厚、以下同じ。）Ｔ１が、軸線方向に沿ってほぼ一定である。なお、コルゲート層４の層厚Ｔ１は、中心軸線Ｏに沿った断面において、コルゲート管部４の外周面の法線方向に沿って測定した値とする。
なお、環状大径部４１とは、コルゲート層４のうち、その外径及び内径が最大となる部分であり、すなわち波形の管壁における山の部分である。環状小径部４２とは、コルゲート層４のうち、その外径及び内径が最小となる部分であり、すなわち波形の管壁における谷の部分である。 The corrugated layer 4 is made of, for example, a resin such as polypropylene (PP), polyethylene (PE), polyamide fiber (PA), and in this example, the corrugated layer 4 has a radial direction (a direction perpendicular to the axial direction; the same applies hereinafter). It is formed in a circular shape in cross section. The corrugated layer 4 is formed of a corrugated tube wall in which annular large-diameter portions 41 and annular small-diameter portions 42 having a smaller diameter than the annular large-diameter portion 41 are alternately arranged in the axial direction. In the example of FIG. 1, the layer thickness (the wall thickness of the tube wall, hereinafter the same) T1 of the corrugated layer 4 is substantially constant along the axial direction. The layer thickness T1 of the corrugated layer 4 is a value measured along the normal direction of the outer peripheral surface of the corrugated tube portion 4 in the cross section along the central axis O.
The annular large-diameter portion 41 is a portion of the corrugated layer 4 where the outer diameter and inner diameter are maximized, that is, a crest portion on the corrugated tube wall. The annular small-diameter portion 42 is a portion of the corrugated layer 4 in which the outer diameter and inner diameter are minimum, that is, a valley portion in the corrugated tube wall.

図１の例では、コルゲート層４が、アール付きの滑らかな波形に形成されている。より具体的に、図１の例では、環状大径部４１と環状小径部４２とが、軸線方向に沿って一定間隔毎に交互に配置されており、環状大径部４１と環状小径部４２との間が、径方向及び軸線方向に対して交わる方向に延びる管壁部分によって滑らかに連結されている。
ただし、コルゲート層４は、環状大径部４１と環状小径部４２とが軸線方向に交互に配置されてなる波形の管壁からなる限り、図１とは異なる形状に形成されてもよい。例えば、コルゲート層４は、よりアールの少ない、角張った波形に形成されてもよい。より具体的には、環状大径部４１と環状小径部４２とを、それぞれ軸線方向に沿って所定長さにわたってまっすぐ延在させてもよい。また、これに加えて、又はこれに代えて、コルゲート層４の管壁のうち、環状大径部４１と環状小径部４２とを連結する管壁部分は、径方向に沿って、又は、径方向及び軸線方向に対して交わる方向に沿って、まっすぐ延在してもよい。 In the example of FIG. 1, the corrugated layer 4 is formed in a smooth corrugated waveform. More specifically, in the example of FIG. 1, the annular large diameter portion 41 and the annular small diameter portion 42 are alternately arranged at regular intervals along the axial direction, and the annular large diameter portion 41 and the annular small diameter portion 42 are arranged. Are smoothly connected by a tube wall portion extending in a direction intersecting the radial direction and the axial direction.
However, the corrugated layer 4 may be formed in a shape different from that shown in FIG. 1 as long as the corrugated layer 4 is formed of a corrugated tube wall in which the annular large-diameter portions 41 and the annular small-diameter portions 42 are alternately arranged in the axial direction. For example, the corrugated layer 4 may be formed in an angular waveform with less rounding. More specifically, the annular large-diameter portion 41 and the annular small-diameter portion 42 may each extend straight over a predetermined length along the axial direction. In addition to or instead of this, the tube wall portion connecting the annular large-diameter portion 41 and the annular small-diameter portion 42 in the tube wall of the corrugated layer 4 extends along the radial direction or the diameter. It may extend straight along the direction intersecting the direction and the axial direction.

コルゲート層４の層厚Ｔ１は、８０〜２００μｍである。上述したように、図１の例では、コルゲート層４の層厚Ｔ１が、軸線方向に沿ってほぼ一定であるが、コルゲート層４の層厚Ｔ１は、軸線方向に沿って、上記数値範囲内で変動してもよい。   The layer thickness T1 of the corrugated layer 4 is 80 to 200 μm. As described above, in the example of FIG. 1, the layer thickness T1 of the corrugated layer 4 is substantially constant along the axial direction, but the layer thickness T1 of the corrugated layer 4 is within the above numerical range along the axial direction. May vary.

緩衝層３は、例えば発泡樹脂、不織布、ガラス繊維、又は、ガラスウール等の、クッション性のある材料（すなわち緩衝材）から形成されている。発泡樹脂としては、例えば、無架橋ポリエチレン発泡体、架橋ポリエチレン発泡体、ウレタンフォーム等が好適に使用できる。図１の例では、緩衝層３がコルゲート層４に沿った波形の管状に形成されている。
図１の例では、緩衝層３の外周面の全体が、コルゲート層４の内周面に対して固定されている。緩衝層３をコルゲート層４へ固定する手法としては、例えば溶着による固定又は接着剤による固定がある。緩衝層３は、本例のように他の層を介さずにコルゲート層４に対して直接固定されてもよいし、あるいは、他の層を介してコルゲート層４に対して固定されてもよい。ただし、緩衝層３は、その外周面の一部又は全体において、コルゲート層４に対して固定されていなくてもよい。
図１の例では、緩衝層３の層厚Ｔ２が、軸線方向に沿ってほぼ一定である。しかし、緩衝層３の層厚Ｔ２は、軸線方向に沿って変動してもよい。なお、本例において、緩衝層３の層厚Ｔ２は、中心軸線Ｏに沿った断面において、緩衝層３の外周面の法線方向に沿って測定した値とする。
緩衝層３の内周面は、本管部２の外周面に対しては固定されていない。
なお、複合管１は、緩衝層３を備えていなくてもよい。 The buffer layer 3 is formed of a cushioning material (that is, a buffer material) such as foamed resin, nonwoven fabric, glass fiber, or glass wool. As the foamed resin, for example, a non-crosslinked polyethylene foam, a crosslinked polyethylene foam, a urethane foam or the like can be suitably used. In the example of FIG. 1, the buffer layer 3 is formed in a corrugated tubular shape along the corrugated layer 4.
In the example of FIG. 1, the entire outer peripheral surface of the buffer layer 3 is fixed to the inner peripheral surface of the corrugated layer 4. As a method for fixing the buffer layer 3 to the corrugated layer 4, for example, fixing by welding or fixing by an adhesive is available. The buffer layer 3 may be directly fixed to the corrugated layer 4 without passing through other layers as in this example, or may be fixed to the corrugated layer 4 through other layers. . However, the buffer layer 3 may not be fixed to the corrugated layer 4 in a part or the whole of the outer peripheral surface thereof.
In the example of FIG. 1, the layer thickness T2 of the buffer layer 3 is substantially constant along the axial direction. However, the layer thickness T2 of the buffer layer 3 may vary along the axial direction. In this example, the layer thickness T2 of the buffer layer 3 is a value measured along the normal direction of the outer peripheral surface of the buffer layer 3 in the cross section along the central axis O.
The inner peripheral surface of the buffer layer 3 is not fixed to the outer peripheral surface of the main pipe part 2.
Note that the composite tube 1 may not include the buffer layer 3.

本管部２の外径は、コルゲート層４の内周面の最小内径（内径の最小値。以下同じ。）以下である。本例のように複合管１に緩衝層３が設けられる場合、本管部２の外径は、本管部２が緩衝層３の内周側に配置されていない状態での緩衝層３（すなわち非圧縮状態での緩衝層３）の内周面の最小内径以下であることが好ましいが、コルゲート層４の内周面の最小内径以下である限り、本管部２が緩衝層３の内周側に配置されていない状態での緩衝層３の内周面の最小内径よりも大きくてもよい。   The outer diameter of the main pipe portion 2 is equal to or smaller than the minimum inner diameter (minimum inner diameter; the same applies hereinafter) of the inner peripheral surface of the corrugated layer 4. When the buffer layer 3 is provided in the composite pipe 1 as in this example, the outer diameter of the main pipe part 2 is the buffer layer 3 in a state where the main pipe part 2 is not disposed on the inner peripheral side of the buffer layer 3 ( That is, the inner diameter of the buffer layer 3) in the uncompressed state is preferably equal to or smaller than the minimum inner diameter of the inner peripheral surface of the buffer layer 3). You may be larger than the minimum internal diameter of the internal peripheral surface of the buffer layer 3 in the state which is not arrange | positioned at the circumference side.

本実施形態の複合管１によれば、コルゲート層４の層厚Ｔ１が、８０〜２００μｍと、従来の樹脂製コルゲート管よりも薄くされている。このため、コルゲート層４が、全体的に比較的柔らかくなり、ひいては、径方向内側への力に対して変形され易くなるとともに、軸線方向に伸縮され易くなる。
これにより、仮に、本実施形態の複合管１が他の管（本実施形態の複合管１も含む。）に隣接して配設された場合に、例えばいずれか一方の管がウォーターハンマーによって振動する等して、複合管１の外周面（ひいてはコルゲート層４の外周面）が該他の管の外周面に当たったとき（複合管１同士が当たったときも含む。）に発生する音を、抑制できる。 According to the composite pipe 1 of this embodiment, the layer thickness T1 of the corrugated layer 4 is 80 to 200 μm, which is thinner than the conventional resin corrugated pipe. For this reason, the corrugated layer 4 becomes relatively soft as a whole, and as a result, the corrugated layer 4 is easily deformed with respect to the radially inward force and is easily expanded and contracted in the axial direction.
Accordingly, if the composite pipe 1 of the present embodiment is disposed adjacent to another pipe (including the composite pipe 1 of the present embodiment), for example, either one of the pipes is vibrated by a water hammer. As a result, the sound generated when the outer peripheral surface of the composite pipe 1 (and thus the outer peripheral surface of the corrugated layer 4) hits the outer peripheral face of the other pipe (including when the composite pipes 1 hit each other). Can be suppressed.

なお、施工現場において、作業員によって複合管１の本管部２が管継手に接続される際には、まず、本管部２の軸線方向の一端部を覆うコルゲート層４（本例では、コルゲート層４及び緩衝層３）が軸線方向に縮められることによって本管部２の軸線方向の一端部が外部に露出され、外部に露出した本管部２の軸線方向の一端部が管継手に接続される。そして、本管部２が管継手に接続された後は、いったん縮められたコルゲート層４の軸線方向の一端部が元に戻されて、本管部２が外部に露出しないようにされる。
本実施形態の複合管１によれば、上述のように、コルゲート層４の層厚Ｔ１が８０〜２００μｍと薄くされているので、コルゲート層４が軸線方向に伸縮され易い。よって、本管部２が管継手に接続される際に、作業員は、より小さな力でコルゲート層４を縮めることができ、また、いったん縮められたコルゲート層４は、作業員が手を離せば自然と元に戻るので、作業性が向上される。また、従来のように、本管部２が外部に露出したままとなるおそれがないので、施工後の状態の見栄えも向上される。 In addition, in the construction site, when the main pipe part 2 of the composite pipe 1 is connected to the pipe joint by an operator, first, the corrugated layer 4 (in this example, covering one end part of the main pipe part 2 in the axial direction). As the corrugated layer 4 and the buffer layer 3) are contracted in the axial direction, one end portion in the axial direction of the main pipe portion 2 is exposed to the outside, and one end portion in the axial direction of the main pipe portion 2 exposed to the outside is a pipe joint. Connected. And after the main pipe part 2 is connected to the pipe joint, one end part in the axial direction of the corrugated layer 4 once shrunk is returned to its original position so that the main pipe part 2 is not exposed to the outside.
According to the composite pipe 1 of the present embodiment, as described above, since the layer thickness T1 of the corrugated layer 4 is as thin as 80 to 200 μm, the corrugated layer 4 is easily expanded and contracted in the axial direction. Therefore, when the main pipe portion 2 is connected to the pipe joint, the worker can shrink the corrugated layer 4 with a smaller force, and the worker once releases the corrugated layer 4 once shrunk. If it returns to the original, the workability is improved. Moreover, since there is no possibility that the main pipe part 2 remains exposed to the outside as in the prior art, the appearance of the state after construction is also improved.

また、仮に本管部２の外径が緩衝層３の内周面の最小内径よりも小さい場合（ひいては、本管部２の外周面と緩衝層３の内周面との間に隙間がある場合）であっても、作業員は、複合管１を持った際に、コルゲート層４が径方向内側に向けて容易に撓むので、（本例では緩衝層３を介して）内部の本管部２をしっかりと保持することができる。これにより、例えば、施工現場において、作業員が複合管１を縦に持った際に本管部２がコルゲート層４から抜け出るおそれがないので、複合管１は扱いが容易である。また、例えば、施工現場において、作業員は、複合管１における軸線方向の一端部から数ｍ手前の中間部分を持ったまま、複合管１を中心軸線Ｏ周りで回転させることにより、複合管１における軸線方向の一端部における本管部２の先端の向きを簡単に調整することもできる。このように、本実施形態の複合管１によれば、高い作業性を得ることができる。   Further, if the outer diameter of the main pipe portion 2 is smaller than the minimum inner diameter of the inner peripheral surface of the buffer layer 3 (as a result, there is a gap between the outer peripheral surface of the main pipe portion 2 and the inner peripheral surface of the buffer layer 3). However, when the worker holds the composite pipe 1, the corrugated layer 4 easily bends radially inward, so that the internal book (through the buffer layer 3 in this example) The pipe part 2 can be held firmly. Thereby, for example, in the construction site, when the worker holds the composite pipe 1 vertically, there is no possibility that the main pipe portion 2 comes out of the corrugated layer 4, so that the composite pipe 1 is easy to handle. Further, for example, at a construction site, an operator rotates the composite pipe 1 around the central axis O while holding the intermediate portion several meters before the one end in the axial direction of the composite pipe 1, thereby It is also possible to easily adjust the direction of the tip of the main pipe 2 at one end in the axial direction. Thus, according to the composite pipe 1 of the present embodiment, high workability can be obtained.

なお、上述のように、複合管１が他の管に当たったときに発生する音を抑制し、また、コルゲート層４の作業性を向上させる観点から、コルゲート層４の層厚Ｔ１は、８０〜１５０μｍであると、より好適である。   As described above, from the viewpoint of suppressing the sound generated when the composite pipe 1 hits another pipe and improving the workability of the corrugated layer 4, the layer thickness T1 of the corrugated layer 4 is 80 It is more suitable in it being -150 micrometers.

また、上述のように、本例では、複合管１が本管部２とコルゲート層４との間に緩衝層３を備えているので、例えばウォーターハンマー等によって本管部２が振動することにより、本管部２の外周面がコルゲート層４に当たったときに発生する音を抑制できる。また、緩衝層３を設けることにより、より効果的に、本管部２の傷からの保護や保温が可能となる。
緩衝層３の層厚（肉厚）Ｔ２は、３５０〜５０００μｍ（またはコルゲート層４の層厚Ｔ１の２．５〜６０倍）であると好適である。
なお、本例のように、緩衝層３をコルゲート層４に沿った波形の管状に形成した場合は、比較的薄く形成されたコルゲート層４の形状を、より効果的に維持できる点、好適である。 In addition, as described above, in this example, since the composite pipe 1 includes the buffer layer 3 between the main pipe portion 2 and the corrugated layer 4, the main pipe portion 2 is vibrated by, for example, a water hammer. The sound generated when the outer peripheral surface of the main pipe portion 2 hits the corrugated layer 4 can be suppressed. Further, by providing the buffer layer 3, it is possible to more effectively protect the main pipe portion 2 from scratches and keep it warm.
The thickness (thickness) T2 of the buffer layer 3 is preferably 350 to 5000 μm (or 2.5 to 60 times the layer thickness T1 of the corrugated layer 4).
In addition, when the buffer layer 3 is formed in a corrugated tubular shape along the corrugated layer 4 as in this example, it is preferable in that the shape of the corrugated layer 4 formed relatively thin can be maintained more effectively. is there.

また、本例のように、緩衝層３の外周面の少なくとも一部（本例では全部）をコルゲート層４の内周面に固定した場合、例えば作業員が本管部２を継手に接続する際等にコルゲート層４をいったん縮めて、その後に元に戻した際に、緩衝層３がコルゲート層４の動きに追従するので、緩衝層３がいったん縮められたままコルゲート層４の内部で詰まるおそれがない点、好適である。   When at least a part (all in this example) of the outer peripheral surface of the buffer layer 3 is fixed to the inner peripheral surface of the corrugated layer 4 as in this example, for example, an operator connects the main pipe part 2 to the joint. When the corrugated layer 4 is once shrunk and then returned to the original state, the buffer layer 3 follows the movement of the corrugated layer 4, so that the buffer layer 3 is clogged inside the corrugated layer 4 while being shrunk. This is preferable because there is no fear.

なお、本実施形態の複合管１は、上述したものに限られず、様々な変形例が可能である。
例えば、緩衝層３は、コルゲート層４に沿った波形の管状に形成される必要はなく、他の形状に形成されてもよい。図２、図３にそれぞれ示す変形例は、緩衝層３の構成のみが、図１の例と異なる。
図２に示す変形例において、緩衝層３は、まっすぐな円管状に形成されている。より具体的に、緩衝層３の外周面及び内周面は、軸線方向に沿ってまっすぐに延在している。この場合でも、緩衝層３の外周面の少なくとも一部はコルゲート層４の内周面に固定されていることが好ましい。また、緩衝層３の内周面は、本管部２の外周面に固定されない。図２の例のように、緩衝層３の内周面を軸線方向にまっすぐ延在させた場合は、図１の例に比べて、より広い面積で緩衝層３が本管部２に接触し得るので、作業員が複合管１を持った際に、よりしっかりと本管部２を保持できる点、好適である。また、図２の例の場合、同様の観点から、緩衝層３の内周面が、他の層を介さずに、本管部２の外周面に直接接していると、より好適である。なお、本例において、緩衝層３の層厚Ｔ２は、径方向に沿って測定した値とする。緩衝層３の層厚Ｔ２の好ましい値は、図１の例と同様である。 In addition, the composite pipe | tube 1 of this embodiment is not restricted to what was mentioned above, Various modifications are possible.
For example, the buffer layer 3 does not need to be formed in a corrugated tubular shape along the corrugated layer 4, and may be formed in another shape. The modification shown in FIGS. 2 and 3 is different from the example of FIG. 1 only in the configuration of the buffer layer 3.
In the modification shown in FIG. 2, the buffer layer 3 is formed in a straight circular tube. More specifically, the outer peripheral surface and the inner peripheral surface of the buffer layer 3 extend straight along the axial direction. Even in this case, it is preferable that at least a part of the outer peripheral surface of the buffer layer 3 is fixed to the inner peripheral surface of the corrugated layer 4. Further, the inner peripheral surface of the buffer layer 3 is not fixed to the outer peripheral surface of the main pipe portion 2. When the inner peripheral surface of the buffer layer 3 extends straight in the axial direction as in the example of FIG. 2, the buffer layer 3 comes into contact with the main pipe portion 2 in a wider area than in the example of FIG. 1. Therefore, when the worker holds the composite pipe 1, the main pipe part 2 can be held more securely. In the case of the example in FIG. 2, it is more preferable that the inner peripheral surface of the buffer layer 3 is in direct contact with the outer peripheral surface of the main pipe portion 2 without any other layer from the same viewpoint. In this example, the layer thickness T2 of the buffer layer 3 is a value measured along the radial direction. A preferable value of the layer thickness T2 of the buffer layer 3 is the same as the example of FIG.

図３に示す他の変形例において、緩衝層３は、コルゲート層４の内周面と本管部２の外周面とにより区画される隙間にほぼ適合するような管形状に形成されている。より具体的に、緩衝層３の外周面は、コルゲート層４の内周面に沿った波形であるとともに、緩衝層３の内周面は、軸線方向に沿って延在している。この場合でも、緩衝層３の外周面の少なくとも一部はコルゲート層４の内周面に固定されていることが好ましい。また、緩衝層３の内周面は、本管部２の外周面に固定されない。図３の例の構成によれば、図２の例と同様に、作業員が複合管１を持った際に、よりしっかりと本管部２を保持できる。さらに、図３の例の構成によれば、図１や図２の例に比べて、緩衝層３によって、コルゲート層４と本管部２との間の空気（冷気）の流れをより効果的に遮断できるので、保温効果を向上できる。また、本管部２をコルゲート層４に対して偏らずに径方向中央に配置できるので、その点でも、保温効果を向上できる。また、図３の例の場合、同様の観点から、緩衝層３の内周面が、他の層を介さずに、本管部２の外周面に直接接していると、より好適である。なお、本例において、緩衝層３の層厚Ｔ２は、径方向に沿って測定した値とする。緩衝層３の層厚Ｔ２の好ましい値は、図１の例と同様である。   In another modification shown in FIG. 3, the buffer layer 3 is formed in a tube shape that substantially fits a gap defined by the inner peripheral surface of the corrugated layer 4 and the outer peripheral surface of the main pipe portion 2. More specifically, the outer peripheral surface of the buffer layer 3 has a waveform along the inner peripheral surface of the corrugated layer 4, and the inner peripheral surface of the buffer layer 3 extends along the axial direction. Even in this case, it is preferable that at least a part of the outer peripheral surface of the buffer layer 3 is fixed to the inner peripheral surface of the corrugated layer 4. Further, the inner peripheral surface of the buffer layer 3 is not fixed to the outer peripheral surface of the main pipe portion 2. According to the configuration of the example of FIG. 3, as in the example of FIG. 2, when the worker holds the composite pipe 1, the main pipe portion 2 can be held more securely. Further, according to the configuration of the example of FIG. 3, the flow of air (cold air) between the corrugated layer 4 and the main pipe portion 2 is more effective by the buffer layer 3 than in the examples of FIG. 1 and FIG. 2. Since it can be blocked, the heat retention effect can be improved. Moreover, since the main pipe part 2 can be arrange | positioned in the radial direction center, without deviating with respect to the corrugated layer 4, the heat retention effect can be improved also at the point. In the case of the example of FIG. 3, it is more preferable that the inner peripheral surface of the buffer layer 3 is in direct contact with the outer peripheral surface of the main pipe portion 2 without any other layer from the same viewpoint. In this example, the layer thickness T2 of the buffer layer 3 is a value measured along the radial direction. A preferable value of the layer thickness T2 of the buffer layer 3 is the same as the example of FIG.

本発明による複合管は、例えば給水・給湯用の配管等に好適に使用できる。   The composite pipe according to the present invention can be suitably used for, for example, piping for water supply and hot water supply.

１：複合管、 ２：本管部、 ３：緩衝層、 ４：コルゲート層、 ４１：環状大径部、 ４２：環状小径部、 Ｏ：中心軸線   1: composite pipe, 2: main pipe part, 3: buffer layer, 4: corrugated layer, 41: annular large diameter part, 42: annular small diameter part, O: central axis

Claims (3)

本管部と、
前記本管部の外周側に配置され、環状大径部と前記環状大径部よりも小径の環状小径部とが軸線方向に交互に配置されてなる波形の管壁からなる、樹脂製のコルゲート層と、
を備え、
前記コルゲート層の層厚が８０〜２００μｍであることを特徴とする、複合管。 The main section,
A resin corrugated corrugated pipe wall which is arranged on the outer peripheral side of the main pipe part and which has a corrugated pipe wall in which an annular large diameter part and an annular small diameter part having a smaller diameter than the annular large diameter part are alternately arranged in the axial direction. Layers,
With
A composite pipe, wherein the corrugated layer has a thickness of 80 to 200 μm. 前記本管部と前記コルゲート層との間に、緩衝材により構成される緩衝層をさらに備えた、請求項１に記載の複合管。   The composite pipe according to claim 1, further comprising a buffer layer made of a buffer material between the main pipe part and the corrugated layer. 前記緩衝層の内周面は前記本管部の外周面に直接接し、前記軸線方向に沿って延びている、請求項２に記載の複合管。
The composite pipe according to claim 2, wherein an inner peripheral surface of the buffer layer is in direct contact with an outer peripheral surface of the main pipe portion and extends along the axial direction.
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