JP2001124251A - Strip for forming spiral tube, and spiral pipe - Google Patents

Strip for forming spiral tube, and spiral pipe

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Publication number
JP2001124251A
JP2001124251A JP30417299A JP30417299A JP2001124251A JP 2001124251 A JP2001124251 A JP 2001124251A JP 30417299 A JP30417299 A JP 30417299A JP 30417299 A JP30417299 A JP 30417299A JP 2001124251 A JP2001124251 A JP 2001124251A
Authority
JP
Japan
Prior art keywords
strip
forming
sealing material
tube
spiral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP30417299A
Other languages
Japanese (ja)
Inventor
Toru Kurita
亨 栗田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP30417299A priority Critical patent/JP2001124251A/en
Publication of JP2001124251A publication Critical patent/JP2001124251A/en
Pending legal-status Critical Current

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  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a strip for forming a spiral pipe which can obtain the spiral pipe which is free from any peeling of a sealing material formed on an inner edge of an opening end of a fitting part, excellent in watertightness and airtightness and excellent in mechanical properties. SOLUTION: In the strip 1 for forming the spiral pipe P by spirally winding the strip having a fork-like fitting part 2 on one side edge and an arrowhead- like locking part 3 on the other side edge, and fitting the adjacent fitting part 2 to the locking part 3, the sealing material 25 is bitten in a recessed groove 211 of a locking part 21 of the strip 1, and integrated with an inner edge of the opening end of the fitting part 2 of the strip forming an outer side in the winding.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、螺旋管形成用の帯
状体およびこの帯状体から形成される螺旋管に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band for forming a spiral tube and a spiral tube formed from the band.

【0002】[0002]

【従来の技術】帯状に押出成形された硬質塩化ビニル樹
脂製の帯状体を螺旋状に巻き付け、隣接する部分同士を
嵌合させることで製造される螺旋管は、伸縮性や可撓性
にすぐれているので、広範囲の分野にて利用されている
(たとえば実公昭41−16849号公報を参照)。こ
の帯状体の一つとして、たとえば一側縁に二股状の嵌合
部を有し、他側縁に矢尻状の係止部を有するものが使用
されている。
2. Description of the Related Art A helical tube manufactured by helically winding a strip made of a rigid vinyl chloride resin extruded into a strip and fitting adjacent portions together has excellent elasticity and flexibility. Therefore, it is used in a wide range of fields (for example, see Japanese Utility Model Publication No. 41-16849). As one of the strips, for example, one having a bifurcated fitting portion on one side edge and an arrowhead-shaped locking portion on the other side edge is used.

【0003】そして、この帯状体の成形は、一側縁に二
股状の嵌合部を有し、他側縁に矢尻状の係止部を有する
帯状体を金型より押し出し、この帯状体を賦形装置にて
賦形しながら水槽内にて帯状体全体を均一に冷却したの
ち、巻取機にてドラムに巻き取ることで行われている。
[0003] The band is formed by extruding a band having a bifurcated fitting portion on one side edge and an arrowhead-like locking portion on the other side edge from a mold. This is performed by uniformly cooling the entire belt-like body in a water tank while shaping with a shaping device, and then winding it around a drum with a winder.

【0004】なお、通常はドラムに巻き取って仕掛かり
品として在庫しているが、巻取機に巻き取ることなく、
たとえば特開平1−269786号公報や特開平2−1
82430号公報に開示されている螺旋管製造用の製管
機を用いて、冷却したのち引取機にて引き取られる帯状
体をそのまま螺旋状に巻き付けて螺旋管の製管を行う場
合もある。
[0004] Normally, it is wound up on a drum and stocked as a work-in-progress, but without being wound up by a winder,
For example, JP-A-1-269786 and JP-A-2-1-1
In some cases, using a tube manufacturing machine disclosed in Japanese Patent Application Laid-Open No. 82430 for manufacturing a spiral tube, a belt-shaped body to be taken up by a take-off machine after being cooled is spirally wound as it is to form a spiral tube.

【0005】ところで、この螺旋管を電力ケーブルや通
信ケーブルなどの保護管として用いる場合、圧縮および
引張強度、耐衝撃性などの機械的物性に加えて、高度の
水密性や気密性が要求される。
When the spiral tube is used as a protective tube for a power cable, a communication cable, and the like, a high degree of watertightness and airtightness is required in addition to mechanical properties such as compression and tensile strength and impact resistance. .

【0006】このため、帯状体を押出成形する際に、一
般的に、帯状体の二股状の嵌合部の開口端内縁に、たと
えば軟質塩化ビニル樹脂などのエラストマー製のシール
材を、帯状体の全長にわたって共押出して形成してい
る。
For this reason, when extruding a strip, generally, an elastomeric sealing material such as a soft vinyl chloride resin is attached to the inner edge of the open end of the bifurcated fitting portion of the strip. Are formed by co-extrusion over the entire length of.

【0007】ところで、螺旋管を製管する際に、帯状体
は製管用のマンドレルに強制的に螺旋状に巻き付けられ
るので、螺旋管の管壁内部において周方向に歪みが必然
的に発生することになる。
[0007] When a spiral tube is manufactured, the belt-like body is forcibly spirally wound around a mandrel for manufacturing the tube, so that a circumferential distortion is necessarily generated inside the tube wall of the spiral tube. become.

【0008】[0008]

【発明が解決しようとする課題】しかしながら、上記帯
状体のように、嵌合部の開口端内縁に単にシール材を共
押出ししたものでは、螺旋管の製管時にシール材が開口
端内縁から剥がれ、水密性や気密性が損なわれるという
問題があった。特に、製管される螺旋管の口径が小口径
のものである場合、二股状の嵌合部内に矢尻状の係止部
を押し込んで嵌合させる際に、シール材がより剥がれ易
くなるという現象があった。
However, in the case where the sealing material is simply co-extruded on the inner edge of the open end of the fitting portion, as in the above-mentioned belt-like body, the seal material is peeled off from the inner edge of the open end when the spiral tube is formed. However, there is a problem that watertightness and airtightness are impaired. In particular, when the diameter of the spiral pipe to be formed is small, when the arrowhead-shaped engaging portion is pushed into the forked fitting portion and fitted therein, the sealing material is more easily peeled off. was there.

【0009】また、シール材が軟質塩化ビニル樹脂の場
合、添加される可塑剤の移行性の大小、つまり、可塑剤
の種類によって上記シール材の剥がれ易さが加速される
とともに、螺旋管の耐衝撃強度が低下するという問題が
あった。
When the sealing material is a soft vinyl chloride resin, the degree of migration of the added plasticizer, that is, the kind of the plasticizer accelerates the peeling of the sealing material depending on the type of the plasticizer, and the resistance of the spiral tube is increased. There is a problem that the impact strength is reduced.

【0010】本発明の目的は、嵌合部の開口端内縁に形
成したシール材が剥がれず、すぐれた水密性や気密性を
有するとともに、機械的強度にすぐれた螺旋管を得るこ
とができる螺旋管形成用の帯状体を提供することであ
る。
[0010] It is an object of the present invention to provide a helical tube which can obtain a helical tube having excellent water-tightness and air-tightness and excellent mechanical strength without peeling off a sealing material formed on an inner edge of an opening end of a fitting portion. The object is to provide a band for forming a tube.

【0011】[0011]

【課題を解決するための手段】請求項1記載の本発明
は、一側縁に二股状の嵌合部を有し、他側縁に矢尻状の
係止部を有する帯状体を螺旋状に巻き付け、軸方向に隣
接する嵌合部と係止部を嵌合することによって筒状の螺
旋管を形成するための螺旋管形成用の帯状体において、
巻き付けるときに外面側となる前記帯状体の嵌合部の開
口端内縁に、シール材が帯状体の全長にわたって食い込
んで一体化されているものである。
According to the first aspect of the present invention, a belt-like body having a bifurcated fitting portion on one side edge and an arrowhead-like locking portion on the other side edge is formed in a spiral shape. In a band for spiral tube formation for forming a tubular spiral tube by winding a winding portion and fitting a fitting portion and a locking portion adjacent in the axial direction,
The sealing material is integrated into the inner edge of the opening end of the fitting portion of the band which is the outer surface side when wound around the entire length of the band.

【0012】そして、本発明における帯状体の材質とし
ては、軟化温度が80℃以上で、溶融温度が130℃以
下の硬質塩化ビニル樹脂や塩素化された塩化ビニル樹脂
が好ましい。また、シール材の材質としては、軟質塩化
ビニル樹脂などのエラストマーが好ましく、トリメリッ
ト酸−トリ−2−エチルヘキシルなどのトリメリット酸
系可塑剤を含有したものが良好である。
As the material of the strip in the present invention, a hard vinyl chloride resin having a softening temperature of 80 ° C. or higher and a melting temperature of 130 ° C. or lower or a chlorinated vinyl chloride resin is preferable. Further, as a material of the sealing material, an elastomer such as a soft vinyl chloride resin is preferable, and a material containing a trimellitic acid-based plasticizer such as trimellitic acid-tri-2-ethylhexyl is preferable.

【0013】請求項3記載の本発明は、請求項1または
2記載の帯状体を用いて製造される螺旋管である。
According to a third aspect of the present invention, there is provided a helical tube manufactured using the belt-shaped body according to the first or second aspect.

【0014】(作用)請求項1記載の本発明では、巻き
付けるときに外面側となる帯状体の嵌合部の開口端内縁
に、シール材が帯状体の全長にわたって食い込んで一体
化されているので、螺旋管を成形する際に発生する曲げ
やねじりなどの外力が作用しても、シール材が帯状体か
ら剥がれることがない。このため、土圧や輪荷重によっ
て嵌合接続部からの水の浸入を防止することができる螺
旋管を得ることができる。
(Function) In the present invention, the sealing material is integrated into the inner edge of the opening end of the fitting portion of the band which becomes the outer surface side when wound, over the entire length of the band. Also, even when an external force such as bending or torsion generated when the spiral tube is formed acts, the sealing material does not peel off from the strip. For this reason, it is possible to obtain a helical tube that can prevent intrusion of water from the fitting connection portion due to earth pressure or wheel load.

【0015】請求項2記載の本発明では、帯状体が硬質
塩化ビニル樹脂製のものであり、しかも、シール材が移
行性の低いトリメリット酸−トリ−2−エチルヘキシル
を含有した軟質塩化ビニル樹脂製のものであるので、嵌
合部の開口端内縁とシール材との接着性が損なわれにく
く、シール材が剥がれない。また、帯状体の強度低下が
生じないので、機械的強度にすぐれた螺旋管が得られ
る。
According to the second aspect of the present invention, the belt is made of a hard vinyl chloride resin, and the sealing material is a soft vinyl chloride resin containing trimellitic acid-tri-2-ethylhexyl having a low migration property. Therefore, the adhesiveness between the inner edge of the opening end of the fitting portion and the sealing material is not easily impaired, and the sealing material does not peel off. In addition, since the strength of the strip does not decrease, a helical tube having excellent mechanical strength can be obtained.

【0016】したがって、請求項3記載の本発明の螺旋
管は、電力ケーブルや通信ケーブルなどの埋設保護管と
して好適なものである。
Therefore, the spiral tube according to the third aspect of the present invention is suitable as a buried protective tube for a power cable, a communication cable and the like.

【0017】[0017]

【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図1は、本発明の螺旋管形成用の
帯状体の一例を示す断面図である。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a band for forming a spiral tube according to the present invention.

【0018】図1において、帯状体1は、硬質塩化ビニ
ル樹脂から押出成形されてなるものであり、その全長に
わたって略Y字状の断面形状を有している。帯状体1は
一側縁に二股状の嵌合部2を有し、他側縁に嵌合部2内
に摺動可能に嵌入係止される係止部3を有している。嵌
合部2の開口端内縁には抜け止め部21,22が対向し
て設けられている。抜け止め部21,22の開口端面は
末広がり状のテーパ面23,24とされている。係止部
3の先端には矢尻状の突起31が設けられている。
In FIG. 1, a belt-like body 1 is formed by extrusion molding from a hard vinyl chloride resin, and has a substantially Y-shaped cross section over its entire length. The belt-shaped body 1 has a bifurcated fitting portion 2 on one side edge, and a locking portion 3 slidably fitted and locked in the fitting portion 2 on the other side edge. At the inner edge of the open end of the fitting portion 2, retaining portions 21 and 22 are provided to face each other. The open end faces of the retaining portions 21 and 22 are formed as divergent tapered surfaces 23 and 24. An arrowhead-shaped projection 31 is provided at the tip of the locking portion 3.

【0019】そして、巻き付けるときに外面側となる帯
状体1の嵌合部2の開口端内縁の抜け止め部21には、
軟質塩化ビニル樹脂製のシール材25が帯状体1の全長
にわたって共押出されて一体化されている。このシール
材25はその一部が、図2に示すように、抜け止め部2
1に形成された凹溝211内に帯状体1の全長にわたっ
て食い込んで一体化されている。凹溝211の幅は抜け
止め部21の幅の約1/3とされている。シール材25
は可塑剤としてトリメリット酸−トリ−2−エチルヘキ
シルを含有している。軟質塩化ビニル樹脂と可塑剤の比
率は、重量比で約1:1である。
The retaining portion 21 at the inner edge of the opening end of the fitting portion 2 of the belt-shaped body 1 which is on the outer surface side when winding is provided.
A sealing material 25 made of a soft vinyl chloride resin is coextruded and integrated over the entire length of the belt-shaped body 1. As shown in FIG. 2, a part of the sealing material 25 is
The belt-like body 1 is integrated into the concave groove 211 formed in the same. The width of the concave groove 211 is about 1/3 of the width of the retaining portion 21. Seal material 25
Contains trimellitic acid-tri-2-ethylhexyl as a plasticizer. The ratio of the soft vinyl chloride resin to the plasticizer is about 1: 1 by weight.

【0020】上記帯状体1を使用して螺旋管を製造する
には、たとえば特開平2−182430号公報に開示さ
れた製管機を用いて螺旋状に巻き付けながら、二股状の
嵌合部2内に、テーパ面23,24を利用して、隣接す
る係止部3の矢尻状の突起31を押し込んで嵌合させる
ことによって、図3に示す螺旋管Pが製造される。
In order to manufacture a helical tube using the above-mentioned band-shaped body 1, for example, a bifurcated fitting portion 2 is spirally wound by using a tube making machine disclosed in Japanese Patent Application Laid-Open No. 2-182430. The helical tube P shown in FIG. 3 is manufactured by pushing and fitting the arrowhead-shaped projections 31 of the adjacent locking portions 3 using the tapered surfaces 23 and 24 therein.

【0021】この実施例の場合、図2に示すように、シ
ール材25の一部が抜け止め部21の凹溝211内に食
い込んで一体化されているので、凹溝211が存在して
いない場合に比べて、抜け止め部21に対するシール材
25の接着面積は約1.6倍となる。この結果、抜け止
め部21に対するシール材25の接着強度は約1.6倍
となる。しかも、シール材25中に含まれる可塑剤が、
移行性の低いトリメリット酸−トリ−2−エチルヘキシ
ルであるので、硬質塩化ビニル樹脂製の帯状体1の衝撃
強度に影響を及ぼすことがない。
In the case of this embodiment, as shown in FIG. 2, since a part of the sealing material 25 is cut into the groove 211 of the retaining portion 21 and integrated, the groove 211 does not exist. In comparison with the case, the bonding area of the sealing material 25 to the retaining portion 21 is about 1.6 times. As a result, the adhesive strength of the sealing material 25 to the retaining portion 21 becomes about 1.6 times. Moreover, the plasticizer contained in the sealing material 25 is
Since it is trimellitic acid-tri-2-ethylhexyl having a low migration property, it does not affect the impact strength of the band 1 made of hard vinyl chloride resin.

【0022】このようにして製造された螺旋管は、地中
埋設管として使用され、土圧や輪荷重などの繰り返し荷
重が作用しても、割れなどが発生するおそれがなく、安
定的に使用することができる。
The spiral pipe manufactured in this manner is used as an underground pipe, and does not crack even if a repeated load such as earth pressure or wheel load is applied. can do.

【0023】[0023]

【発明の効果】請求項1記載の本発明においては、巻き
付けるときに外面側となる帯状体の嵌合部の開口端内縁
に、シール材が帯状体の全長にわたって食い込んで一体
化されているので、螺旋管を成形する際に発生する曲げ
やねじりなどの外力が作用しても、シール材が帯状体か
ら剥がれることがなく、土圧や輪荷重によって嵌合接続
部からの水の浸入を防止することができる螺旋管を得る
ことができる。
According to the first aspect of the present invention, since the sealing material is integrated into the inner edge of the opening end of the fitting portion of the band which becomes the outer surface side when wound, over the entire length of the band. Even when external force such as bending or torsion that occurs when forming a spiral tube acts, the sealing material does not peel off from the strip, preventing water from entering from the fitting connection due to earth pressure or wheel load A helical tube can be obtained.

【0024】請求項2記載の本発明では、帯状体が硬質
塩化ビニル樹脂製のものであり、しかも、シール材が移
行性の小さいトリメリット酸−トリ−2−エチルヘキシ
ルを含有した軟質塩化ビニル樹脂製のものであるので、
嵌合部の開口端内縁とシール材との接着性が損なわれず
シール材が剥がれない。また、帯状体の強度低下が生じ
ないので、機械的強度にすぐれた螺旋管が得られる。
According to the second aspect of the present invention, the strip is made of a hard vinyl chloride resin, and the sealing material is a soft vinyl chloride resin containing trimellitic acid-tri-2-ethylhexyl having a small migration property. Because it is made of
The adhesive property between the inner edge of the opening end of the fitting portion and the sealing material is not impaired, and the sealing material does not peel off. In addition, since the strength of the strip does not decrease, a helical tube having excellent mechanical strength can be obtained.

【0025】したがって、請求項3記載の本発明の螺旋
管は、電力ケーブルや通信ケーブルなどの埋設保護管と
して好適に使用することができる。
Therefore, the spiral tube according to the third aspect of the present invention can be suitably used as a buried protective tube for a power cable, a communication cable, and the like.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の螺旋管形成用の帯状体の一例を示す断
面図である。
FIG. 1 is a cross-sectional view showing an example of a band for forming a spiral tube according to the present invention.

【図2】図1の要部を示す拡大断面図である。FIG. 2 is an enlarged sectional view showing a main part of FIG.

【図3】図1の帯状体から形成された螺旋管を示す部分
断面図である。
FIG. 3 is a partial cross-sectional view showing a spiral tube formed from the strip of FIG. 1;

【符号の説明】[Explanation of symbols]

1 帯状体 2 嵌合部 21,22 抜け止め部 211 凹溝 23,24 テーパ面 25 シール材 3 係止部 31 突起 DESCRIPTION OF SYMBOLS 1 Band-shaped body 2 Fitting part 21,22 Retaining part 211 Depressed groove 23,24 Tapered surface 25 Seal material 3 Locking part 31 Projection

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】一側縁に二股状の嵌合部を有し、他側縁に
矢尻状の係止部を有する帯状体を螺旋状に巻き付け、軸
方向に隣接する嵌合部と係止部を嵌合することによって
筒状の螺旋管を形成するための螺旋管形成用の帯状体に
おいて、 巻き付けるときに外面側となる前記帯状体の嵌合部の開
口端内縁に、シール材が帯状体の全長にわたって食い込
んで一体化されていることを特徴とする螺旋管形成用の
帯状体。
1. A belt-like body having a bifurcated fitting portion on one side edge and an arrowhead-like locking portion on the other side edge is spirally wound and locked with a fitting portion adjacent in the axial direction. In a band for forming a helical tube for forming a cylindrical helical tube by fitting the parts, a sealing material is formed on the inner edge of the opening end of the fitting portion of the band which is the outer surface side when wound. A strip for forming a spiral tube, wherein the strip is formed by biting and being integrated over the entire length of the body.
【請求項2】帯状体が硬質塩化ビニル樹脂製のものであ
り、シール材が可塑剤としてトリメリット酸−トリ−2
−エチルヘキシルを含有した軟質塩化ビニル樹脂製のも
のである請求項1記載の螺旋管形成用の帯状体。
2. The belt-shaped body is made of a hard vinyl chloride resin, and the sealing material is trimellitic acid-tri-2 as a plasticizer.
The strip for forming a spiral tube according to claim 1, wherein the strip is made of a soft vinyl chloride resin containing -ethylhexyl.
【請求項3】請求項1記載の螺旋管形成用の帯状体から
形成されてなる螺旋管。
3. A helical tube formed from the strip for forming a helical tube according to claim 1.
JP30417299A 1999-10-26 1999-10-26 Strip for forming spiral tube, and spiral pipe Pending JP2001124251A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30417299A JP2001124251A (en) 1999-10-26 1999-10-26 Strip for forming spiral tube, and spiral pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30417299A JP2001124251A (en) 1999-10-26 1999-10-26 Strip for forming spiral tube, and spiral pipe

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100967741B1 (en) * 2007-04-09 2010-07-05 윤임규 Variable water pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100967741B1 (en) * 2007-04-09 2010-07-05 윤임규 Variable water pipe

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