JP4927792B2 - Corrugated tube and piping structure - Google Patents
Corrugated tube and piping structure Download PDFInfo
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- JP4927792B2 JP4927792B2 JP2008177890A JP2008177890A JP4927792B2 JP 4927792 B2 JP4927792 B2 JP 4927792B2 JP 2008177890 A JP2008177890 A JP 2008177890A JP 2008177890 A JP2008177890 A JP 2008177890A JP 4927792 B2 JP4927792 B2 JP 4927792B2
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- 239000000454 talc Substances 0.000 claims description 31
- 229910052623 talc Inorganic materials 0.000 claims description 31
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 17
- 239000003063 flame retardant Substances 0.000 claims description 17
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 229920005672 polyolefin resin Polymers 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 description 23
- 238000005452 bending Methods 0.000 description 17
- 230000001681 protective effect Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000006229 carbon black Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910052736 halogen Inorganic materials 0.000 description 4
- 150000002367 halogens Chemical class 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Description
本発明は、ケーブル等の保護管として使用され、高温でも直線形状を保ち、高強度であり、軽量かつ施工性に優れる波付き管およびこれを用いた配管構造に関する。 The present invention relates to a corrugated pipe that is used as a protective pipe for cables and the like, maintains a linear shape even at high temperatures, has high strength, is lightweight, and has excellent workability, and a piping structure using the corrugated pipe.
従来、電線等のケーブルの保護管としては、鋼管や樹脂製の可撓管等が用いられる。鋼管は、通常、構造物の屋内外において、保護管が露出する部分に用いられる。鋼製の保護管は整直性が優れるため、見た目がよく、時間経過とともに保護管が撓むこともない。一方、樹脂製の可撓管は、地中等に埋設する部分に用いられる。樹脂製の可撓管は、軽量であると共に、特殊な工具を必要とせず、容易に曲げることができ、施工性、耐食性に優れるためである。このように、使用部位に応じて、保護管の種類が使い分けられる。 Conventionally, steel pipes, resin-made flexible pipes, and the like are used as protective pipes for cables such as electric wires. The steel pipe is usually used for a portion where the protective pipe is exposed inside and outside the structure. Since the steel protective tube has excellent straightness, it looks good and the protective tube does not bend over time. On the other hand, a resin-made flexible tube is used for a portion embedded in the ground or the like. This is because the resin-made flexible tube is lightweight, can be easily bent without requiring a special tool, and has excellent workability and corrosion resistance. Thus, the type of protective tube is properly used according to the use site.
このような、電線等のケーブルの保護管としては、種々の鋼管や可撓管が使用されており、例えば、樹脂製の可撓管としては、外周が波形に形成され、波形の一部に最薄部を形成することで、可撓性に優れる波付き電線管がある（特許文献１）。 Various steel tubes and flexible tubes are used as protective tubes for cables such as electric wires. For example, as a flexible tube made of resin, the outer periphery is formed in a corrugated shape, and a part of the corrugated shape is used. By forming the thinnest part, there is a corrugated electric pipe excellent in flexibility (Patent Document 1).
しかし、従来の鋼管を用いる方法では、鋼管の配管の際に、配管現場において、特殊な工具等を用いて、配管の切断や曲げ加工を行う必要があるため、作業性が悪い。また、施工に時間を要し、保護管が重いため、作業性も悪いという問題がある。 However, in the conventional method using a steel pipe, workability is poor because it is necessary to cut or bend the pipe using a special tool or the like at the piping site when piping the steel pipe. In addition, the construction takes time and the protective tube is heavy, so that there is a problem that workability is poor.
これに対し、特許文献１のような可撓管を露出部に使用すると、可撓管の自重や内部に挿入されたケーブル等の重みで、可撓管が撓み、見た目が悪くなるという問題がある。また、可撓管の運搬時等においては、ボビン等に巻きつけられるため、巻きぐせにより、配管した際にＳ字状などとなり、見た目が悪くなるという問題がある。 On the other hand, when a flexible tube like patent document 1 is used for an exposure part, a flexible tube will bend by the weight of the flexible tube's own weight or the cable inserted in the inside, etc., and the problem that an appearance worsens. is there. Further, when the flexible tube is transported or the like, it is wound around a bobbin or the like, so that there is a problem in that it looks like an S shape when it is piped due to winding, resulting in poor appearance.
そこで、発明者らは、特願２００７−１０８７６３号において、非フレキシブル性の波付き管を提案した。しかし、従来の非フレキシブル性の波付き管は、常温では整直性に優れるが、高温では整直性を保つことが困難であり、直射日光が当たる場所や、工場等において高温となる場所に使用すると、時間の経過に伴い、自重などで撓みが生じる恐れがあることが分かった。 Accordingly, the inventors have proposed a non-flexible corrugated tube in Japanese Patent Application No. 2007-108763. However, the conventional non-flexible corrugated tube is excellent in straightness at room temperature, but it is difficult to maintain straightness at high temperature, and it is difficult to keep it in direct sunlight or in a place where it gets hot in factories. It has been found that there is a risk of bending due to its own weight with the passage of time when used.
図５は、高温にさらされた状態の配管構造３０を示す図である。波付き管３１ｂ、３１ｃの接合部には、管継手３３が設けられる。また、波付き管３１ａと波付き管３１ｂとの接合部には、エルボ状の管継手３５が用いられる。 FIG. 5 is a diagram showing the piping structure 30 in a state exposed to a high temperature. A pipe joint 33 is provided at the joint between the corrugated pipes 31b and 31c. Further, an elbow-shaped pipe joint 35 is used at the joint between the corrugated pipe 31a and the corrugated pipe 31b.
設置時において整直されていた波付き管３１ａ、３１ｂ、３１ｃは、高温状態においては強度が低下し、自重および内部の電線等の重みなどによって、変形する。したがって、まっすぐに配置された配管構造３０は、波付き管の撓みによって見た目が悪くなるという問題があった。 The corrugated tubes 31a, 31b, 31c that have been trimmed at the time of installation are reduced in strength at high temperatures and deformed by their own weight and the weight of the internal electric wires. Therefore, the piping structure 30 arranged straight has a problem that it looks bad due to the bending of the corrugated pipe.
本発明は、このような問題に鑑みてなされたもので、高温でも整直性に優れ、まっすぐな状態を維持することができ、配管において特殊な工具等を必要とせず、軽量であるため施工性に優れ、強度があり、耐食性、難燃性に優れる波付き管およびこれを用いた配管構造を提供することを目的とする。 The present invention has been made in view of such problems, is excellent in straightness even at high temperatures, can maintain a straight state, does not require a special tool or the like in the piping, and is light in construction. An object of the present invention is to provide a corrugated pipe having excellent properties, strength, corrosion resistance and flame retardancy, and a piping structure using the same.
前述した目的を達成するため、第１の発明は、少なくともポリオレフィン系樹脂１００質量部に対して、難燃材を１〜２０質量部、タルクを１〜１５質量部含み、管体の外周部に谷部と、前記谷部よりも幅および外径が大きく中実の山部とが交互に形成され、前記谷部の最内周部における肉厚よりも、他の部位の肉厚が厚いことを特徴とする樹脂製波付き管である。また、少なくともポリオレフィン系樹脂１００質量部に対して、難燃材を１〜２０質量部、タルクを１〜１５質量部含み、管体の外周部に谷部と、前記谷部よりも幅および外径が大きく、前記谷部の外周部よりも外方に突出する前記山部の内部に空隙を有さない中実の山部とが交互に形成されることを特徴とする樹脂製波付き管である。
In order to achieve the above-described object, the first invention includes 1 to 20 parts by mass of a flame retardant and 1 to 15 parts by mass of talc with respect to at least 100 parts by mass of a polyolefin-based resin. The valleys and the solid peaks with larger widths and outer diameters than the valleys are alternately formed, and the thickness of the other part is thicker than the thickness at the innermost peripheral part of the valleys. This is a resin corrugated tube. Moreover, 1-100 mass parts of flame retardants and 1-15 mass parts of talc are included with respect to 100 mass parts of polyolefin resin at least, and a width | variety and outer side rather than a trough part in the outer peripheral part of a tubular body A resin corrugated tube having a large diameter and alternately formed with solid crests having no voids inside the crests projecting outward from the outer periphery of the troughs It is.
ここで、タルク（ｔａｌｃ）とは、滑石という鉱石を微粉砕した無機粉末である。化学名称は、含水ケイ酸マグネシウム（３ＭｇＯ・４ＳｉＯ２・Ｈ２Ｏ）であり、工業用の原料や無機充填剤として塗料等に広く使用されている物質である。 Here, talc is an inorganic powder obtained by pulverizing an ore called talc. The chemical name is hydrous magnesium silicate (3MgO · 4SiO 2 · H 2 O), which is a substance widely used in paints and the like as industrial raw materials and inorganic fillers.
第１の発明によれば、タルクが１〜１５質量部含まれ、管体の外周部に谷部と中実の山部とが交互に形成されるため、耐熱性に優れ、高温でも整直性に優れる波付き管を得ることができる。難燃材を加えているので、難燃性を向上させることでき、例えば、難燃材としてハロゲン系難燃剤を添加する場合には、添加量を少なくすることができるが、水酸化マグネシウムを添加する場合には、ハロゲン系難燃剤を使用する場合は、添加量を多くする必要がある。難燃材の添加量は、難燃材の種類に応じて、波付き管の難燃性に応じて設定できる。 According to the first invention, 1 to 15 parts by mass of talc is contained, and valleys and solid peaks are alternately formed on the outer periphery of the tube. A corrugated tube having excellent properties can be obtained. Since flame retardant is added, flame retardancy can be improved. For example, when adding a halogen flame retardant as a flame retardant, the amount added can be reduced, but magnesium hydroxide is added. In the case of using a halogen-based flame retardant, it is necessary to increase the amount of addition. The addition amount of the flame retardant can be set according to the flame retardancy of the corrugated tube according to the type of the flame retardant.
さらに、必要に応じてカーボンブラックを添加することができる。カーボンブラックを添加すると、高温整直性も向上させることができるだけでなく、室外の環境下においても紫外線などによる劣化が起こりにくくする効果があるので、カーボンブラックを適宜加えることができる。 Furthermore, carbon black can be added as needed. When carbon black is added, not only can the high-temperature straightness be improved, but there is an effect of making it difficult to cause deterioration due to ultraviolet rays or the like even in an outdoor environment, so carbon black can be added as appropriate.
第２の発明は、第１の発明にかかる樹脂製波付き管を用いた配管構造であって、直線状の前記波付き管が、配管構造の曲線部分を含まない配管の直線部分に配置されたことを特徴とする保護管構造である。 2nd invention is a piping structure using the resin corrugated pipe concerning 1st invention, Comprising: The said linear corrugated pipe is arrange | positioned at the linear part of piping which does not include the curve part of piping structure. This is a protective tube structure.
第２の発明によれば、高温においても整直性に優れる波付き管を直線部に配置したため、直射日光が当たる部位や工場等の高温箇所において使用しても、直線性を維持することができ、このため見た目に優れる保護管構造を得ることができる。ここで、高温とは６０℃程度を差し、これは、真夏の直射日光が当たる部位や、工場内での高温設備近傍や上部屋根部等において、最大達する恐れがある温度である。 According to the second invention, since the corrugated tube having excellent straightness even at a high temperature is arranged in the straight part, the linearity can be maintained even when used in a part exposed to direct sunlight or a high temperature part such as a factory. For this reason, a protective tube structure excellent in appearance can be obtained. Here, the high temperature refers to about 60 ° C., and this is the temperature that may reach the maximum in a part exposed to direct sunlight in midsummer, in the vicinity of high-temperature equipment in the factory, or on the upper roof.
本発明によれば、高温でも整直性に優れ、まっすぐな状態を維持することができ、さらに必要に応じて耐候性を向上させた配管において特殊な工具等を必要とせず、軽量であるため施工性に優れ、強度があり、耐食性、難燃性に優れる波付き管およびこれを用いた配管構造を提供することができる。 According to the present invention, it is excellent in straightness even at a high temperature, can maintain a straight state, and does not require a special tool or the like in a pipe with improved weather resistance if necessary, and is lightweight. It is possible to provide a corrugated pipe having excellent workability, strength, corrosion resistance and flame retardancy, and a piping structure using the corrugated pipe.
以下、本発明の実施の形態にかかる波付き管１について説明する。図１は、波付き管１を示す図である。 Hereinafter, the corrugated tube 1 according to the embodiment of the present invention will be described. FIG. 1 is a view showing a corrugated tube 1.
波付き管１は、ポリオレフィン系樹脂を主成分とし、難燃材およびタルクを含有する。ポリオレフィン系樹脂としては、例えば高密度ポリエチレンが使用できる。 The corrugated tube 1 contains a polyolefin resin as a main component and contains a flame retardant and talc. For example, high-density polyethylene can be used as the polyolefin-based resin.
発明者らは、種々の検討の結果、ポリエチレンなどの熱可塑性樹脂にタルクを添加することで、強力な有機無機複合体を形成し、材料の強度や曲げ弾性率の向上、耐熱性の向上、寸法安定性の向上等の効果を得ることができることを見出した。すなわち、ポリエチレン等にタルクを添加することで、高温でも材料の強度が劣化することがない。このため、高温になる部位にタルクを含有する波付き管１を設置しても、波付き管１が撓み等生じることがなく、見た目に優れた配管構造を保つことができる。 As a result of various studies, the inventors have formed a strong organic-inorganic composite by adding talc to a thermoplastic resin such as polyethylene, improving the strength and bending elastic modulus of the material, improving heat resistance, It has been found that effects such as improvement in dimensional stability can be obtained. That is, by adding talc to polyethylene or the like, the strength of the material does not deteriorate even at high temperatures. For this reason, even if the corrugated tube 1 containing talc is installed at a high temperature site, the corrugated tube 1 does not bend and the like, and an excellent piping structure can be maintained.
タルクは少量の添加でも高温での強度低下を抑制する効果がある。たとえば、ポリエチレン１００質量部に対して１質量部のタルクの添加でも高温強度向上の効果を発揮し、タルクの添加量の増加に従い、その効果は大きくなる。一方、１５質量部を超えたタルクの添加は、波付き管の表面荒れを顕著にするとともに、高温強度向上の効果も飽和するため望ましくない。 Talc has an effect of suppressing a decrease in strength at a high temperature even when added in a small amount. For example, even when 1 part by mass of talc is added to 100 parts by mass of polyethylene, the effect of improving the high temperature strength is exhibited, and the effect increases as the amount of talc added increases. On the other hand, the addition of talc in excess of 15 parts by mass is not desirable because the surface roughness of the corrugated tube becomes noticeable and the effect of improving the high-temperature strength is saturated.
したがってタルクの添加量はポリエチレン１００質量部に対して、１〜１５質量部の添加が望ましく、さらには、７〜１０質量部の添加が望ましい。７質量部以上添加すれば、６０℃ｘ２４時間での波付き管１の変形量を最大でも０．８％以下（波付き管の長さ１０００ｍｍに対しての撓み量の割合）に抑えることができ、タルクの添加量が１０質量部以下であるため、外観に優れる波付き管を得ることができる。変形量が０．８％以下であれば、見た目上変形が目立たないため、波付き管は直線を維持しているように見え、外観に優れた配管構造を得ることができる。 Therefore, the addition amount of talc is desirably 1 to 15 parts by mass, and more desirably 7 to 10 parts by mass with respect to 100 parts by mass of polyethylene. If 7 parts by mass or more are added, the deformation amount of the corrugated tube 1 at 60 ° C. × 24 hours can be suppressed to 0.8% or less (the ratio of the deflection amount with respect to the length of the corrugated tube of 1000 mm) at the maximum. In addition, since the amount of talc added is 10 parts by mass or less, a corrugated tube excellent in appearance can be obtained. If the amount of deformation is 0.8% or less, the apparent deformation is not conspicuous, so the corrugated tube appears to maintain a straight line, and a piping structure with excellent appearance can be obtained.
難燃材としては、公知のいずれの難燃材も使用することができるが、例えばハロゲン系では臭素系のものが使用でき、ノンハロゲン系では水酸化マグネシウムが使用できる。難燃材として臭素系を添加する場合には、ポリオレフィン系樹脂１００質量部に対して１〜５質量部であることが望ましい。また、難燃材として水酸化マグネシウムを添加する場合には、ポリオレフィン系樹脂１００質量部に対して５〜２０質量部であることが望ましい。難燃材の添加量は、難燃材の種類に応じて、波付き管の難燃性を得られる範囲で設定される。 As the flame retardant, any known flame retardant can be used. For example, a bromine-based material can be used for a halogen-based material, and magnesium hydroxide can be used for a non-halogen-based material. When adding a bromine system as a flame retardant, it is desirable that it is 1-5 mass parts with respect to 100 mass parts of polyolefin resin. Moreover, when adding magnesium hydroxide as a flame retardant, it is desirable that it is 5-20 mass parts with respect to 100 mass parts of polyolefin resin. The addition amount of the flame retardant is set in a range in which the flame resistance of the corrugated tube can be obtained according to the type of the flame retardant.
さらに、高温での整直性や耐候性を向上させるためには、カーボンブラックを３質量部までの範囲で加えることができる。カーボンブラックの添加量が０．３質量部以下では、高温での整直性や耐候性向上に効果がなく、３質量部以上加えると高温での整直性や耐候性に対する効果が飽和するので、添加量の上限は３質量部までとする。カーボンブラックを上記の範囲で加えることにより、高温での整直性や耐候性が改善するので、カーボンブラックを加えることもできる。 Furthermore, in order to improve the straightness and weather resistance at high temperature, carbon black can be added in the range of up to 3 parts by mass. If the added amount of carbon black is 0.3 parts by mass or less, there is no effect on improving the straightness and weather resistance at high temperatures, and if adding 3 parts by mass or more, the effects on the straightness and weather resistance at high temperatures are saturated. The upper limit of the addition amount is up to 3 parts by mass. By adding carbon black in the above range, the straightness and weather resistance at high temperatures are improved, so carbon black can also be added.
波付き管１は、外周部に山部３と谷部５とを交互に有する管体である。山部３は谷部５よりも外径が大きく、また、山部３の幅は、谷部５の幅よりも大きい。山部３は中実であり、波付き管１の内周面には、外周面のような明確な山部、谷部はない。すなわち、山部３の厚みは、谷部５の厚みよりも厚い。谷部５の内周面は、やや内周に向かって円弧上に膨れた形状である。したがって、波付き管１の内周面には大きな凹凸がないため、電線等を挿入した際に引っ掛かることがない。 The corrugated tube 1 is a tubular body having crests 3 and troughs 5 alternately on the outer periphery. The crest 3 has a larger outer diameter than the trough 5, and the crest 3 is wider than the trough 5. The crest 3 is solid, and the inner peripheral surface of the corrugated tube 1 does not have a clear crest or trough like the outer peripheral surface. That is, the thickness of the peak 3 is thicker than the thickness of the valley 5. The inner peripheral surface of the valley portion 5 has a shape bulging on an arc toward the inner periphery. Therefore, since there is no big unevenness | corrugation in the internal peripheral surface of the corrugated tube 1, it is not caught when an electric wire etc. are inserted.
図２は、波付き管１ａ、１ｂ、１ｃを接続した配管構造１３を示す図である。波付き管１ａ、１ｂ、１ｃは、それぞれ整直されており、直線状の形状を有する。波付き管１ｂ、１ｃの接合のように、直線状の接続部には、管継手７が設けられる。また、波付き管１ａと波付き管１ｂとの接合部のように、直角に曲げて接続される部位には、エルボ状の管継手９が用いられる。なお、管継手９に代えて、従来の可撓管を用い、その可撓管を図示しない管継手７で繋ぐこともできる。また、必要に応じて、波付き管１ｃの端部にはスイッチボックス１１等の周辺部材が設けられる。なお、配管構造１３が屋外に使用される場合には、管継手７、９は、それぞれ防水性を有することが望ましい。 FIG. 2 is a diagram showing a piping structure 13 in which the corrugated tubes 1a, 1b, and 1c are connected. Each of the corrugated tubes 1a, 1b, 1c is straightened and has a linear shape. The pipe joint 7 is provided in the linear connection part like the joining of the corrugated pipes 1b and 1c. In addition, an elbow-shaped pipe joint 9 is used at a portion that is bent and connected at a right angle, such as a joint portion between the corrugated pipe 1a and the corrugated pipe 1b. Instead of the pipe joint 9, a conventional flexible pipe can be used and the flexible pipe can be connected by a pipe joint 7 (not shown). Further, if necessary, peripheral members such as a switch box 11 are provided at the end of the corrugated tube 1c. In addition, when the piping structure 13 is used outdoors, it is desirable that the pipe joints 7 and 9 each have waterproofness.
配管構造１３は、屋外や室内の壁面等の見える部分に設置される。したがって、美観を保つためには、配管構造１３に使用される波付き管１ａ、１ｂ、１ｃには高い整直性が要求される。 The piping structure 13 is installed in a visible part such as an outdoor or indoor wall surface. Therefore, in order to maintain the aesthetic appearance, the corrugated pipes 1a, 1b, 1c used in the pipe structure 13 are required to have high straightness.
配管構造１３が屋外に設置される場合には、真夏の直射日光等の影響により、波付き管１は６０℃程度の高温にさらされる恐れがある。また、室内であっても、工場などの高温発生設備の近傍や、高温発生設備が設置された工場の屋根部等においても、６０℃程度の高温となる恐れがある。従来の配管構造３０では、前述のとおり、高温では波付き管３１の強度が低下し、常温で有していた整直性が劣化する。しかし、タルクを含む波付き管１ａ、１ｂ、１ｃは、高温でも優れた整直性を示し、波付き管の撓みが極めて小さい。したがって、配管構造１３は、高温部に配置しても、見た目が悪くなることがない。 When the piping structure 13 is installed outdoors, the corrugated tube 1 may be exposed to a high temperature of about 60 ° C. due to direct sunlight in midsummer. Even indoors, the temperature may be as high as about 60 ° C. in the vicinity of a high-temperature generating facility such as a factory or in a roof portion of a factory where the high-temperature generating facility is installed. In the conventional piping structure 30, as described above, the strength of the corrugated pipe 31 decreases at a high temperature, and the straightness possessed at room temperature deteriorates. However, the corrugated tubes 1a, 1b, and 1c containing talc exhibit excellent straightness even at high temperatures, and the corrugated tube has very little deflection. Therefore, even if the piping structure 13 is disposed in the high temperature portion, the appearance does not deteriorate.
本発明にかかる波付き管１について、高温時の撓み量を計測した。図３は、高温時の波付き管の撓み量の測定方法を示す図で、図３（ａ）は、試験体２０を設置した状態、図３（ｂ）は、所定条件の高温保持後に、試験体２０が変形した状態を示す図である。 About the corrugated tube 1 concerning this invention, the deflection amount at the time of high temperature was measured. FIG. 3 is a diagram illustrating a method for measuring the amount of deflection of a corrugated tube at a high temperature. FIG. 3 (a) shows a state in which a test body 20 is installed, and FIG. It is a figure which shows the state which the test body 20 deform | transformed.
試験体２０は、両端を受台２１で支持した。受台２１の間隔は１ｍとした。この状態で恒温槽に入れ、３０℃、４０℃、６０℃の温度でそれぞれ２４時間保持し、保持後の変形量２３を計測した。変形量２３は、試験体２０の中央の点での撓み量である。 The test body 20 supported both ends with the cradle 21. The interval between the cradle 21 was 1 m. It put into the thermostat in this state, and it hold | maintained for 24 hours, respectively at the temperature of 30 degreeC, 40 degreeC, and 60 degreeC, and measured the deformation amount 23 after holding | maintenance. The deformation amount 23 is the amount of deflection at the center point of the test body 20.
試験に供した各試験体の仕様は表１に示す。タルク含有量を０〜１０質量部、管径を１６〜３６ｍｍφとして、計１６種類の試験体を対象に試験を行った。表中のタルク量は、ポリエチレン１００質量部に対するタルクの質量部を示す。試験体は、ポリエチレン１００質量部に対して臭素系の難燃材を３．６質量部添加し、さらに所定量のタルクを添加した。波付き管はそれぞれ図１に示す形状であり、谷部肉厚が約１．５ｍｍ、山部肉厚が約３．５ｍｍとした。 Table 1 shows the specifications of each specimen used for the test. The test was conducted on a total of 16 types of test bodies with a talc content of 0 to 10 parts by mass and a tube diameter of 16 to 36 mmφ. The amount of talc in the table indicates the part by mass of talc relative to 100 parts by mass of polyethylene. The test body added 3.6 parts by mass of a brominated flame retardant to 100 parts by mass of polyethylene, and further added a predetermined amount of talc. Each of the corrugated tubes has the shape shown in FIG. 1 and has a valley thickness of about 1.5 mm and a peak thickness of about 3.5 mm.
各試験体の各条件での撓み量を表２〜表３に示す。なお、表２は、３０℃、４０℃、６０℃における試験体単体での試験結果であり、表３は、３０℃、４０℃、６０℃における、各試験体に下記の各径の波付け管に対して、ケーブルを挿入した状態での試験結果である。
１６φ…約１６ｍｍ×１ｍ（重量約：１６０ｇ／ｍ）
２２φ…約２２ｍｍ×１ｍ（重量約：２２０ｇ／ｍ）
２８φ…約２８ｍｍ×１ｍ（重量約：３００ｇ／ｍ）
３６φ…約３６ｍｍ×１ｍ（重量約：４１０ｇ／ｍ）
Tables 2 to 3 show the amount of bending of each specimen under each condition. Table 2 shows the test results of the specimens at 30 ° C., 40 ° C., and 60 ° C., and Table 3 shows the corrugation of the following diameters on each specimen at 30 ° C., 40 ° C., and 60 ° C. It is a test result in the state which inserted the cable with respect to the pipe | tube.
16φ: about 16mm × 1m (weight: about 160g / m)
22φ: about 22 mm x 1 m (weight: about 220 g / m)
28φ: about 28mm x 1m (weight: about 300g / m)
36φ: about 36 mm × 1 m (weight: about 410 g / m)
試験結果より明らかなように、タルクを添加しない試験体では、低温（３０℃）では大きな変形はないが、４０℃、６０℃と温度が上昇するにつれて変形が大きくなり、特にケーブルを挿入した状態での変形が顕著となった。なお、小径（１６φ）の変形量が全体的に大きいのは、試験体自体の剛性が小さいためである。 As is clear from the test results, the specimen without talc does not deform greatly at low temperatures (30 ° C), but the deformation increases as the temperature rises to 40 ° C and 60 ° C, especially when the cable is inserted. Deformation at was noticeable. The reason why the deformation amount of the small diameter (16φ) is large as a whole is that the rigidity of the specimen itself is small.
本発明にかかる、タルクが添加された試験体では、おおむね高温での変形量が抑制された。したがって、タルクの添加によって高温強度が向上し、試験体をケーブル等の保護管として使用すれば、高温状態で使用されても保護管の撓み量を抑えることができる。このため、見た目に優れる配管構造を得ることができる。 In the test body to which talc was added according to the present invention, the amount of deformation at high temperature was generally suppressed. Therefore, the addition of talc improves the high-temperature strength, and if the test specimen is used as a protective tube such as a cable, the amount of deflection of the protective tube can be suppressed even when used at a high temperature. For this reason, the piping structure excellent in appearance can be obtained.
特に、タルクを１０質量部添加することで、ケーブルを挿入した状態であっても、６０℃ｘ２４時間保持後の変形量が全ての管径で２ｍｍ以下となった。１ｍの保護管に対して、中央の撓み量が８ｍｍ以下であれば、保護管を設置した状態でも外観上保護管が撓んでいるようには見えず、直線性を維持しているように見えるため特に望ましい。なお、中央の撓み量が５ｍｍ以下であればさらに望ましい。 In particular, by adding 10 parts by mass of talc, even when the cable was inserted, the amount of deformation after holding at 60 ° C. for 24 hours was 2 mm or less for all tube diameters. If the amount of bending at the center is 8 mm or less with respect to a 1 m protective tube, the protective tube does not appear to be bent even when the protective tube is installed, and it seems that the linearity is maintained. This is especially desirable. In addition, it is more desirable if the central deflection amount is 5 mm or less.
次に、同様の試験体を用いて、各試験体の曲げ剛性を計測した。図４は曲げ剛性の試験方法を示す図である。試験体２０の一方の端部を壁体２５に略水平に設置した。試験体２０の長さは２００ｍｍとした。試験体２０を２３±２℃に２時間保持した後、図中矢印Ａ方向に３０ｍｍ／分の速度で４０秒間引っ張り（変位量２７は、２０ｍｍ）その際の荷重を測定した。 Next, the bending rigidity of each test body was measured using the same test body. FIG. 4 is a diagram illustrating a bending rigidity test method. One end of the test body 20 was installed on the wall body 25 substantially horizontally. The length of the test body 20 was 200 mm. After holding the test body 20 at 23 ± 2 ° C. for 2 hours, it was pulled in the direction of arrow A in the figure at a speed of 30 mm / min for 40 seconds (displacement amount 27 was 20 mm), and the load at that time was measured.
曲げ剛性は、以下の式で算出される。
ＥＩ＝Ｗ・ｌ３／３δ ・・・（式）
ここで、ＥＩは曲げ剛性（Ｎ・ｍ２）、ｌは長さ（ｍ）、Ｗは荷重（Ｎ）、δは変位量（ｍ）である。したがって、曲げ剛性ＥＩ＝０．１３３Ｗで算出することができる。
The bending rigidity is calculated by the following formula.
EI = W · l 3 / 3δ (formula)
Here, EI is bending rigidity (N · m 2 ), l is length (m), W is load (N), and δ is displacement (m). Therefore, it can be calculated with a bending rigidity EI = 0.133W.
各試験体の曲げ剛性を表４に示す。結果より明らかにように、曲げ剛性は管径によって大きく異なるが、タルクの添加によって曲げ剛性は向上し、強度が向上した。特に、タルクの添加量に応じて曲げ剛性は向上した。 Table 4 shows the bending rigidity of each specimen. As is clear from the results, the bending stiffness varies greatly depending on the tube diameter, but the addition of talc improved the bending stiffness and improved the strength. In particular, the bending stiffness was improved according to the amount of talc added.
以上説明したように、本実施の形態にかかる波付き管１によれば、タルクを含有するため、特に高温での強度に優れ、高温で保持した際の撓み量を極めて小さく抑えることができる。 As described above, according to the corrugated tube 1 according to the present embodiment, since talc is contained, the strength at a high temperature is particularly excellent, and the amount of bending when held at a high temperature can be suppressed to be extremely small.
また、タルクの添加量が１５質量部以下であるため、表面の肌荒れも生じることがなく、見た目に優れる波付き管を得ることができる。特に、タルク７質量部以上であれば、６０℃×２４時間保持後の撓み量を、１ｍの波付き管に対して８ｍｍ以下に抑えることが可能であるため、波付き管が撓んでいることが外観上把握されることがなく、直線性が維持されるため、波付き管を高温にさらされる部位のケーブル保護管に使用した際にも、見た目に優れる保護管構造を得ることができる。 Further, since the amount of talc added is 15 parts by mass or less, the surface of the skin is not roughened, and a corrugated tube excellent in appearance can be obtained. In particular, if the talc is 7 parts by mass or more, the amount of bending after holding at 60 ° C. for 24 hours can be suppressed to 8 mm or less with respect to a 1 m waved tube, and therefore the waved tube is bent. Therefore, even when the corrugated tube is used as a cable protection tube at a portion exposed to a high temperature, a protective tube structure excellent in appearance can be obtained.
波付き管１は、外周部に山部３と谷部５とを交互に有し、山部３は谷部５よりも外径が大きく、また、山部３の幅は、谷部５の幅よりも大きいため、強度が高く、整直性に優れるため、ケーブル等の配管として使用した際の見た目に優れ、鋼管よりも軽量で加工性にも優れるため、配管の設置も容易な波付き管を得ることができる。 The corrugated tube 1 has crests 3 and troughs 5 alternately on the outer periphery, the crests 3 have a larger outer diameter than the troughs 5, and the crest 3 has a width of the troughs 5. Because it is larger than the width, it has high strength and excellent straightness, so it looks good when used as piping for cables, etc. It is lighter than steel pipes and has excellent workability, so it is easy to install piping A tube can be obtained.
以上、添付図を参照しながら、本発明の実施の形態を説明したが、本発明の技術的範囲は、前述した実施の形態に左右されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.
１ａ、１ｂ、１ｃ………波付き管
３………山部
５………谷部
７………管継手
９………管継手
１１………スイッチボックス
１３………配管構造
２０………試験体
２１………受台
２３………変形量
２５………壁体
２７………変位量
３０………配管構造
３１ａ、３１ｂ、３１ｃ………波付き管
３３………管継手
３５………管継手
３７………スイッチボックス
1a, 1b, 1c ......... Wave tube 3 ......... Mount 5 ......... Valley 7 ......... Fitting 9 ......... Fitting 11 ......... Switch box 13 ......... Piping structure 20 ... ... Test body 21 ......... Receiver 23 ......... Deformation amount 25 ......... Wall body 27 ......... Displacement amount 30 ......... Piping structure 31a, 31b, 31c ......... Wave tube 33 ......... Pipe joint 35 ………… Fitting 37 ……… Switch box
Claims (3)
前記谷部の最内周部における肉厚よりも、他の部位の肉厚が厚いことを特徴とする樹脂製波付き管。 At least 100 parts by mass of polyolefin-based resin, 1-20 parts by mass of a flame retardant, 1-15 parts by mass of talc, a valley at the outer periphery of the tube, and a width and an outer diameter that are greater than those of the valleys Large and solid mountain parts are alternately formed ,
A resin corrugated tube, wherein the thickness of the other portion is thicker than the thickness of the innermost peripheral portion of the valley .
It is a piping structure using the resin corrugated pipe according to claim 1 or 2 , wherein the straight corrugated pipe is arranged in a straight portion not including a curved portion of the piping structure. Piping structure.
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