JPH06241348A - Method of forming inner pipe in pipe line - Google Patents

Method of forming inner pipe in pipe line

Info

Publication number
JPH06241348A
JPH06241348A JP5024193A JP5024193A JPH06241348A JP H06241348 A JPH06241348 A JP H06241348A JP 5024193 A JP5024193 A JP 5024193A JP 5024193 A JP5024193 A JP 5024193A JP H06241348 A JPH06241348 A JP H06241348A
Authority
JP
Japan
Prior art keywords
pipe
synthetic resin
resin pipe
temperature
line
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.)
Granted
Application number
JP5024193A
Other languages
Japanese (ja)
Other versions
JP3417592B2 (en
Inventor
Hiroyuki Sakuragi
弘行 桜木
Masahiro Seshimo
雅博 瀬下
Hiroshi Makimoto
太司 槇本
Shinichi Takebe
紳一 武部
Takuji Sokawa
卓治 惣川
Hitoshi Saito
斉藤  均
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.)
Ashimori Industry Co Ltd
Original Assignee
Ashimori Industry 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 Ashimori Industry Co Ltd filed Critical Ashimori Industry Co Ltd
Priority to JP5024193A priority Critical patent/JP3417592B2/en
Publication of JPH06241348A publication Critical patent/JPH06241348A/en
Application granted granted Critical
Publication of JP3417592B2 publication Critical patent/JP3417592B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To prevent a synthetic resin pipe adapted to be inserted in a pipe line so as to form an inner pipe, from being deformed, and to enhance the pressure resistance by holding the pipe in a flat folded condition before it is inserted into the pipe line so as to prevent the pipe from being formed in a permanent recess-like cross-sectional shape. CONSTITUTION:In order to manufacture an inner pipe in a pipe line, at first a pipe 5 made of a hard thermoplastic synthetic resin and extrusion-molded in a cylindrical shape, is folded in a flat shape at a temperature around the viscut softening temperature of the resin. Then, the pipe 5 is then heated up to a temperature which is sufficiently lower than the viscut softening point and at which the pipe 5 may be deformed, so as to be curved into a V-like or U-like cross-sectional shape while the flat-folded condition is sustained. Then, the curved pipe 5 is inserted into the pipe line 9, and is heated up to a temperature higher than the temperature at which the pipe 5 is curved while an internal pressure is effected so as to inflate the pipe 5 in order to from an inner pipe in the pipe line 9. With this arrangement, the pipe 5 is held in a flat folded condition just before the insertion of the pipe 5 into the pipe line 9. Thereby it is possible to eliminate such a problem that the pipe 5 is formed in a recess-like cross-sectional shape.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はガス導管、水道管、下水
道管、通信線や電力線の敷設管路などの、主として地中
に埋設された管路に対し、その管路内に合成樹脂パイプ
を挿通して、当該管路内に新たに硬質の管を形成して補
修又は補強するための方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe in a conduit mainly buried in the ground such as a gas conduit, a water pipe, a sewer pipe, a laying conduit for a communication line or an electric power line. The present invention relates to a method for repairing or reinforcing by newly inserting a hard tube into the pipeline by inserting the tube.

【0002】[0002]

【従来の技術】この種の管路内管を形成する方法は、硬
質の合成樹脂パイプを管路内に挿通することにより行わ
れるが、硬質の合成樹脂パイプを円筒形のままで管路内
に挿通することは極めて困難であり、また長尺の合成樹
脂パイプを円筒形のままで取扱うのも、大きなスペース
を必要とするなど容易ではない。
2. Description of the Related Art A method of forming a pipe in a pipe of this type is carried out by inserting a hard synthetic resin pipe into the pipe. It is extremely difficult to insert the long synthetic resin pipe into the cylindrical shape, and it is not easy to handle the long synthetic resin pipe in a cylindrical shape because it requires a large space.

【0003】従ってその合成樹脂パイプを管路内に挿通
し得る形状に縮小変形し、これを管路内に挿通した後加
熱加圧して管路内で円筒形に膨ませ、管路内面に沿わせ
ることが行われている。
Therefore, the synthetic resin pipe is reduced and deformed into a shape that allows it to be inserted into the conduit, inserted into the conduit, heated and pressurized to expand into a cylindrical shape in the conduit, and then extends along the inner surface of the conduit. It is being done.

【0004】その合成樹脂パイプを縮小変形せしめる代
表的な方法としては、米国特許第4867921号明細
書に記載された方法が知られている。この方法は合成樹
脂パイプ5を押出し成型した後、直ちにその合成樹脂パ
イプ5を扁平に折畳み、さらにその扁平状態の合成樹脂
パイプを図7に示されるように二つ折りにするものであ
る。
As a typical method for reducing and deforming the synthetic resin pipe, a method described in US Pat. No. 4,867,921 is known. In this method, the synthetic resin pipe 5 is extruded and molded, and then the synthetic resin pipe 5 is immediately folded flat, and the flat synthetic resin pipe is folded in two as shown in FIG. 7.

【0005】そしてその状態の合成樹脂パイプ5をコイ
ル状に巻回して収納し、施工現場においてそのまま引出
して管路に挿通し、然る後合成樹脂パイプ内に水蒸気を
送入して加熱加圧し、管路内面に沿わせるのである。
Then, the synthetic resin pipe 5 in that state is wound in a coil shape and housed therein, and at the construction site, it is pulled out as it is and inserted into the pipeline, and then steam is fed into the synthetic resin pipe and heated and pressurized. , Along the inner surface of the pipeline.

【0006】[0006]

【発明が解決しようとする課題】しかしながらこの方法
においては、合成樹脂パイプ5が成型直後に扁平に折畳
まれ且つ二つ折りにされているので、合成樹脂パイプ5
はその形状に固定され、癖がついてしまう。
However, in this method, since the synthetic resin pipe 5 is flatly folded and folded in two immediately after molding, the synthetic resin pipe 5 is
Is fixed in its shape, and has a habit.

【0007】従ってこれを管路9に挿通した後加熱加圧
することにより、一時的には図8に鎖線で示すように円
筒形に膨むが、その合成樹脂パイプ5の素材には前記折
畳み状態における癖が記憶されており、歪がかかってい
る。
Therefore, by inserting this into the pipe 9 and heating and pressurizing it, it temporarily expands into a cylindrical shape as shown by the chain line in FIG. 8, but the material of the synthetic resin pipe 5 is in the folded state. The habit in is remembered and distorted.

【0008】そのため管路9の損傷部から地下水などが
侵入し、合成樹脂パイプ5に外圧が加わると、合成樹脂
パイプ5には扁平状態でさらに二つ折りにされた状態に
戻ろうとする癖がついるため、容易に図8に実線で示す
ような断面略凹字状に変形し、円筒形のままで外圧に耐
えることができないのである。
Therefore, when groundwater or the like enters from the damaged portion of the pipeline 9 and external pressure is applied to the synthetic resin pipe 5, the synthetic resin pipe 5 has a habit of returning to a flat state and further folded into two. Therefore, it is easily deformed into a concave shape in cross section as shown by the solid line in FIG.

【0009】従って前記方法により管路内に管を形成し
ても、長期間のうちには合成樹脂パイプが断面略凹字状
に変形し、内部の流路を狭めてしまう。
Therefore, even if the pipe is formed in the pipe line by the above method, the synthetic resin pipe is deformed into a substantially concave cross section in a long period of time, and the internal flow passage is narrowed.

【0010】また前述の米国特許の他、特開昭64−5
6531号公報に、円筒状の合成樹脂パイプの一部を内
方に押込んで断面略凹字状とすることが記載されている
が、この方法においても合成樹脂パイプに断面略凹字状
の癖がつき、外圧によって当該形状に戻ろうとする。
In addition to the above-mentioned US patent, JP-A-64-5
In Japanese Patent No. 6531, it is described that a part of a cylindrical synthetic resin pipe is pushed inward to form a substantially concave sectional shape. However, even in this method, the synthetic resin pipe has a substantially concave sectional shape. There is a tendency to return to the shape due to external pressure.

【0011】本発明はかかる事情に鑑みなされたもので
あって、合成樹脂パイプに断面略凹字状になろうとする
癖がつくのを防止し、管路内に形成された合成樹脂パイ
プが長期間に亙って変形することなく、外圧に耐えるこ
とができるようにすることを目的とするものである。
The present invention has been made in view of the above circumstances, and prevents the synthetic resin pipe from having a habit of becoming substantially concave in cross section, and makes the synthetic resin pipe formed in the pipe line long. The purpose is to be able to withstand external pressure without being deformed over a period of time.

【0012】[0012]

【課題を解決する手段】而して本発明は、押出し成型に
より円筒形に成型された硬質の熱可塑性合成樹脂製のパ
イプを、当該熱可塑性合成樹脂のビカット軟化点付近の
温度で扁平に折畳んでおき、そのパイプを前記熱可塑性
合成樹脂のビカット軟化点より十分に低く且つ変形可能
の温度に加温して、扁平状態のままで断面略V字状乃至
U字状に彎曲せしめ、その彎曲したパイプを管路内に挿
通し、次いでそのパイプを前記彎曲時の温度よりも高い
温度にまで加熱しつつ内圧をかけて膨ませることを特徴
とするものである。
In the present invention, therefore, a pipe made of a rigid thermoplastic synthetic resin molded into a cylindrical shape by extrusion molding is flatly folded at a temperature near the Vicat softening point of the thermoplastic synthetic resin. The pipe is folded and heated to a temperature that is sufficiently lower than the Vicat softening point of the thermoplastic synthetic resin and can be deformed, and is bent into a substantially V-shaped or U-shaped cross section in a flat state. It is characterized in that a bent pipe is inserted into the pipe, and then the pipe is heated to a temperature higher than the temperature at the time of bending and is expanded by applying an internal pressure.

【0013】[0013]

【実施例】以下本発明の実施例を図面に従って説明す
る。図1は本発明における合成樹脂パイプを成型する状
態を示すものであって、1は押出し機であり、2は当該
押出し機1のダイである。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which a synthetic resin pipe according to the present invention is molded, wherein 1 is an extruder and 2 is a die of the extruder 1.

【0014】3はダイ2の後方から供給される筒状織布
であって、当該筒状織布3の内外両面に前記ダイ2から
熱可塑性合成樹脂4を押出して、円筒形の合成樹脂パイ
プ5が成型される。
Reference numeral 3 denotes a tubular woven cloth which is supplied from the rear of the die 2, and the thermoplastic synthetic resin 4 is extruded from the die 2 onto both inner and outer surfaces of the tubular woven cloth 3 to form a cylindrical synthetic resin pipe. 5 is molded.

【0015】なおここで成型される合成樹脂パイプ5
は、図3に示されるように合成樹脂4の肉厚内に筒状織
布3が埋入されたものであるが、その筒状織布3は合成
樹脂4の内面又は外面に貼着されたものであってもよ
く、また筒状織布3を使用しない合成樹脂4のみのパイ
プであってもよい。
The synthetic resin pipe 5 molded here is used.
3, the tubular woven cloth 3 is embedded in the thickness of the synthetic resin 4 as shown in FIG. 3. The tubular woven cloth 3 is attached to the inner surface or the outer surface of the synthetic resin 4. Alternatively, the pipe may be a pipe made of only the synthetic resin 4 without using the tubular woven fabric 3.

【0016】合成樹脂4は合成樹脂パイプ5が外圧によ
り容易に変形しない程度の剛性を有する熱可塑性の合成
樹脂であることを必要とし、硬質のポリエチレンやポリ
塩化ビニルなどが適当である。特に高密度ポリエチレン
又は線状低密度ポリエチレンが好適である。
The synthetic resin 4 needs to be a thermoplastic synthetic resin having rigidity such that the synthetic resin pipe 5 is not easily deformed by an external pressure, and hard polyethylene or polyvinyl chloride is suitable. High density polyethylene or linear low density polyethylene is particularly preferable.

【0017】ダイ2から押出された合成樹脂パイプ5
は、ダイ2の下方に設けられた水槽6に導入されて温水
7で冷却され、水槽6内に設けられたローラー8で反転
されると共に、図4に示すように扁平に折畳まれる。
A synthetic resin pipe 5 extruded from the die 2.
Is introduced into a water tank 6 provided below the die 2, cooled with hot water 7, inverted by a roller 8 provided in the water tank 6, and folded flat as shown in FIG.

【0018】合成樹脂パイプ5が扁平に折畳まれるとき
の温度は、合成樹脂4のビカット軟化点付近の温度とす
るべきである。合成樹脂4の素材として主として線状低
密度ポリエチレン(ビカット軟化点114℃)を使用す
る場合であれば、114±10℃程度の温度で折畳むの
が適当である。
The temperature at which the synthetic resin pipe 5 is folded flat should be a temperature near the Vicat softening point of the synthetic resin 4. If mainly linear low-density polyethylene (Vicat softening point 114 ° C.) is used as the material of the synthetic resin 4, it is suitable to fold at a temperature of about 114 ± 10 ° C.

【0019】折畳み時の温度が過度に高いと、後に合成
樹脂パイプ5を加熱して膨ませたときに折畳み癖が強く
残り、外圧に耐えることができない。また過度に低い温
度まで冷却すると折畳みに大きい力を要し、また合成樹
脂パイプ5を構成する合成樹脂4にひび割れが生じる。
If the temperature at the time of folding is excessively high, the habit of folding remains strong when the synthetic resin pipe 5 is heated and inflated later, and the external pressure cannot be endured. Further, when cooled to an excessively low temperature, a large force is required for folding, and the synthetic resin 4 constituting the synthetic resin pipe 5 is cracked.

【0020】ローラー8において扁平に折畳まれた合成
樹脂パイプ5は、さらに冷却されて温水7から導出さ
れ、巻取りリール(図示せず)に巻取られ、管路への挿
通に供せられる。
The synthetic resin pipe 5 flatly folded by the roller 8 is further cooled and led out from the hot water 7, wound on a take-up reel (not shown), and provided for insertion into a pipeline. .

【0021】次に図2は、合成樹脂パイプ5を管路9に
挿通する状態を示すものである。図2において合成樹脂
パイプ5は、扁平に折畳まれた状態でリール10に巻回
されている。
Next, FIG. 2 shows a state in which the synthetic resin pipe 5 is inserted into the pipe line 9. In FIG. 2, the synthetic resin pipe 5 is wound around the reel 10 in a flatly folded state.

【0022】リール10から引出された合成樹脂パイプ
5は、先ず加温装置11に通されて加温される。加温装
置11は図5に示すように筒状織布12の内面に軟質の
ゴム又は合成樹脂の皮膜層13を形成した柔軟な筒状体
であって、その一部に温風送入管14が設けられてい
る。
The synthetic resin pipe 5 drawn out from the reel 10 is first passed through a heating device 11 to be heated. As shown in FIG. 5, the heating device 11 is a flexible tubular body in which a coating layer 13 of soft rubber or synthetic resin is formed on the inner surface of a tubular woven fabric 12, and a warm air blowing pipe is provided in a part thereof. 14 are provided.

【0023】而して扁平状態の合成樹脂パイプ5を加温
装置11に通し、加熱流体管14から合成樹脂パイプ5
と加温装置11との間に蒸気を送入することにより、合
成樹脂パイプ5を加温するのである。
Then, the flat synthetic resin pipe 5 is passed through the heating device 11, and the heating fluid pipe 14 is moved to the synthetic resin pipe 5.
The synthetic resin pipe 5 is heated by sending steam between the heating device 11 and the heating device 11.

【0024】合成樹脂パイプ5を加温する温度は、合成
樹脂パイプ5を構成する合成樹脂4のビカット軟化点よ
り十分に低く、且つ合成樹脂4が変形可能の温度とする
べきである。前記合成樹脂4として線状低密度ポリエチ
レンを使用する場合であれば、80〜90℃とするのが
適当である。
The temperature at which the synthetic resin pipe 5 is heated should be sufficiently lower than the Vicat softening point of the synthetic resin 4 constituting the synthetic resin pipe 5, and the synthetic resin 4 should be deformable. When linear low density polyethylene is used as the synthetic resin 4, it is suitable to set the temperature to 80 to 90 ° C.

【0025】加温装置11から出た合成樹脂パイプ5
は、扁平状態のままで断面略V字状乃至U字状に彎曲せ
しめられる。合成樹脂パイプ5は加温装置11で加温さ
れており、図2に示すように合成樹脂パイプ5の中央部
を回転ローラー15で押圧することにより、合成樹脂パ
イプ5を彎曲させることができる。
Synthetic resin pipe 5 discharged from the heating device 11
Is bent into a V-shaped or U-shaped cross-section while remaining flat. The synthetic resin pipe 5 is heated by the heating device 11, and the synthetic resin pipe 5 can be bent by pressing the central portion of the synthetic resin pipe 5 with the rotating roller 15 as shown in FIG.

【0026】而して断面略V字状乃至U字状に彎曲せし
められた合成樹脂パイプ5は、管路9に挿通される。予
め管路9に挿通された牽引索16を合成樹脂パイプ5の
先端に結合し、当該牽引索16を管路9の先端側から牽
引することにより、合成樹脂パイプ5を管路9に挿通す
ることができる。
The synthetic resin pipe 5, which is bent into a V-shaped or U-shaped cross section, is inserted into the pipe line 9. The synthetic resin pipe 5 is inserted into the pipe line 9 by connecting the tow line 16 previously inserted through the pipe line 9 to the tip of the synthetic resin pipe 5 and pulling the pull line 16 from the tip side of the pipe line 9. be able to.

【0027】合成樹脂パイプ5は断面略V字状乃至U字
状に彎曲せしめられているので、図6に示すように管路
9内形状よりも小さくなっており、管路9内面との間に
過度の摩擦抵抗を生じることなく挿通される。
Since the synthetic resin pipe 5 is bent into a V-shaped or U-shaped cross section, it is smaller than the inner shape of the pipe 9 as shown in FIG. It is inserted without causing excessive frictional resistance.

【0028】また合成樹脂パイプ5は加温装置11にお
いて変形可能の温度にまで加温されているので、管路9
に多少の屈曲があっても、その屈曲に沿って曲りながら
挿通されることができる。
Further, since the synthetic resin pipe 5 is heated up to a deformable temperature in the heating device 11, the pipe line 9
Even if there is some bending, it can be inserted while bending along the bending.

【0029】管路9の全長に亙って合成樹脂パイプ5を
挿通したならば、合成樹脂パイプ5内に加圧水蒸気を送
入し、当該合成樹脂パイプ5を加熱すると共に内圧をか
け、円筒形に膨ませて管路9内面に沿わせる。
Once the synthetic resin pipe 5 has been inserted over the entire length of the pipe line 9, pressurized steam is fed into the synthetic resin pipe 5 to heat the synthetic resin pipe 5 and apply an internal pressure to form a cylindrical shape. Inflate to the inner surface of the pipe 9.

【0030】このとき合成樹脂パイプ5は、先に加温装
置11で加温したときの温度よりも十分に高い温度にま
で加熱すべきである。合成樹脂パイプ5を加熱すること
により、断面略V字状乃至U字状に彎曲せしめたことに
よる歪みを除去するのであるが、加熱が不十分であると
合成樹脂パイプ5に歪みが残り、使用中の外圧に耐える
ことができない。
At this time, the synthetic resin pipe 5 should be heated to a temperature sufficiently higher than the temperature when it is heated by the heating device 11 previously. By heating the synthetic resin pipe 5, distortion caused by bending the synthetic resin pipe 5 into a substantially V-shaped or U-shaped cross section is removed, but if the heating is insufficient, the synthetic resin pipe 5 will be distorted and used. Cannot withstand the external pressure inside.

【0031】またビカット軟化点以上にまで加熱し、円
筒形の合成樹脂パイプ5を扁平に折畳んだときの癖まで
除去するのが好ましいが、管路9内に挿通された合成樹
脂パイプ5は、その外面から管路9を介して熱が逃げる
のでそのような高温まで加熱するのは困難であり、また
必ずしも必要ではない。
Further, it is preferable to heat to a temperature not lower than the Vicat softening point to remove even the habit when the cylindrical synthetic resin pipe 5 is flatly folded, but the synthetic resin pipe 5 inserted into the conduit 9 is However, it is difficult, and not necessary, to heat to such a high temperature because heat escapes from its outer surface via the conduit 9.

【0032】[0032]

【作用】本発明によれば、円筒形に成型された合成樹脂
パイプ5をビカット軟化点付近の温度で扁平に折畳んで
いるので、リール10に容易に巻回することができ、ま
た偏平なベルト状の物品としてコンパクトに取扱うこと
ができる。
According to the present invention, since the cylindrical synthetic resin pipe 5 is flatly folded at a temperature near the Vicat softening point, it can be easily wound around the reel 10 and is flat. It can be compactly handled as a belt-shaped article.

【0033】またその合成樹脂パイプ5は扁平に折畳ま
れており、その折畳みの癖はついているが、前記従来例
のように二つ折りにされていないので、それによる癖が
つくことはない。
Further, the synthetic resin pipe 5 is flatly folded and has a peculiar fold, but since it is not folded in half as in the conventional example, the peculiarity does not occur.

【0034】而してその扁平状態の合成樹脂パイプ5を
加温して断面略V字状乃至U字状に彎曲させた状態で管
路9に挿通するので、合成樹脂パイプ5の断面形状が縮
小して容易に管路9に挿通することができる。
Since the flattened synthetic resin pipe 5 is heated and bent into a substantially V-shaped or U-shaped cross section, the synthetic resin pipe 5 is inserted into the pipe line 9, so that the cross-sectional shape of the synthetic resin pipe 5 is changed. It can be reduced and easily inserted into the conduit 9.

【0035】そして合成樹脂パイプ5には一時的に断面
略V字状乃至U字状の歪みが生じるが、その後合成樹脂
パイプ5を彎曲させたときの温度よりも高い温度にまで
加熱することにより前記歪みは解消され、その状態で内
圧をかけて膨ませるので、管路9内面に沿わせることが
できる。
Then, the synthetic resin pipe 5 is temporarily distorted in a substantially V-shaped or U-shaped cross-section, but after that, by heating the synthetic resin pipe 5 to a temperature higher than the temperature when it is bent. Since the strain is eliminated and the inner pressure is expanded in that state, it can be made to follow the inner surface of the pipe line 9.

【0036】合成樹脂パイプ5を管路9に挿通した後、
ビカット軟化点以上にまで加熱すれば、合成樹脂パイプ
5を扁平に折畳んだ癖まで除去されるが、加熱温度がそ
れ以下であれば、扁平の折畳み癖は残る。
After inserting the synthetic resin pipe 5 into the pipe line 9,
If it is heated up to the Vicat softening point or higher, even the habit of flatly folding the synthetic resin pipe 5 is removed, but if the heating temperature is lower than that, the flat habit of folding remains.

【0037】この場合長期間のうちには合成樹脂パイプ
5は扁平に折畳まれた状態に戻ろうとする変形が生じる
が、そのような変形を生じるためには折畳み部が側方に
突出することになり、その部分が管路内面により押えら
れるため、扁平になることができず、円筒形を保持す
る。
In this case, the synthetic resin pipe 5 is deformed to return to a flatly folded state over a long period of time. However, in order to cause such deformation, the folded portion must project laterally. Since that part is pressed by the inner surface of the conduit, it cannot be flattened and maintains a cylindrical shape.

【0038】従って扁平に折畳まれた癖が残っていて
も、断面略V字状乃至U字状に彎曲させたくせさえ除去
されていれば、外圧により合成樹脂パイプ5が押し潰さ
れて変形することはないのである。
Therefore, even if the flat-folded habit remains, the synthetic resin pipe 5 is deformed by being crushed by the external pressure as long as the habit of bending it into a V-shaped or U-shaped cross section is removed. There is no such thing.

【0039】[0039]

【発明の効果】従って本発明によれば、合成樹脂パイプ
5を管路9に引込む直前まで、合成樹脂パイプ5は扁平
に折畳まれているだけであって、二つ折りにされたり断
面凹字状に変形されていることがないので、合成樹脂パ
イプ5に断面略凹字状になろうとする癖がついておら
ず、管路9の損傷部から侵入した地下水などにより外圧
がかかっても合成樹脂パイプ5は十分な耐外圧性を有
し、合成樹脂パイプ5は外圧によって断面凹字状に潰れ
て流路を狭めることがなく、長期間に亙って安定した流
路を形成するのである。
Therefore, according to the present invention, until just before the synthetic resin pipe 5 is drawn into the conduit 9, the synthetic resin pipe 5 is only flatly folded, and is folded in two or has a concave cross section. Since the synthetic resin pipe 5 is not deformed into a circular shape, the synthetic resin pipe 5 does not have a habit of becoming substantially concave in cross section, and even if an external pressure is applied by the groundwater entering from the damaged portion of the pipeline 9, The pipe 5 has sufficient resistance to external pressure, and the synthetic resin pipe 5 does not crush into a concave shape due to external pressure to narrow the flow passage, and forms a stable flow passage over a long period of time.

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

【図1】 本発明における合成樹脂パイプ5を成型して
扁平に折畳む状態を示す正面図
FIG. 1 is a front view showing a state in which a synthetic resin pipe 5 according to the present invention is molded and flatly folded.

【図2】 本発明における合成樹脂パイプ5を彎曲させ
て管路9に引込む状態を示す縦断面図
FIG. 2 is a vertical cross-sectional view showing a state in which the synthetic resin pipe 5 according to the present invention is bent and drawn into a conduit 9.

【図3】 本発明において使用する合成樹脂パイプ5の
一実施例の横断面図
FIG. 3 is a cross-sectional view of one embodiment of the synthetic resin pipe 5 used in the present invention.

【図4】 合成樹脂パイプ5を扁平に折畳んだ状態の横
断面図
FIG. 4 is a transverse cross-sectional view of the synthetic resin pipe 5 folded flat.

【図5】 図2における加温装置11の横断面図5 is a cross-sectional view of the heating device 11 in FIG.

【図6】 合成樹脂パイプ5を略U字状に彎曲させて管
路9に挿通した状態の横断面図
FIG. 6 is a transverse cross-sectional view showing a state where the synthetic resin pipe 5 is bent into a substantially U shape and is inserted into the pipe line 9.

【図7】 従来の方法における合成樹脂パイプの横断面
FIG. 7 is a cross-sectional view of a synthetic resin pipe in the conventional method.

【図8】 従来の方法により形成された管路内管が外圧
により断面略凹字状に潰れた状態を示す横断面図 5 合成樹脂パイプ 9 管路
FIG. 8 is a transverse cross-sectional view showing a state in which a pipe inner pipe formed by a conventional method is crushed into a substantially concave shape by an external pressure.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 武部 紳一 大阪府吹田市岸辺北1丁目4番1号 醇風 寮 (72)発明者 惣川 卓治 滋賀県大津市一里山3丁目1番7号 (72)発明者 斉藤 均 大阪府豊中市上新田1丁目24番E−604 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Takebe 1-4-1, Kishibekita, Suita City, Osaka Prefecture Dorif Dormitory (72) Inventor Takuji Sorikawa 3-7-1 Ichiriyama, Otsu City, Shiga Prefecture (72) ) Inventor Hitoshi Saito 1-24-24 Kaminita, Toyonaka-shi, Osaka E-604

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 押出し成型により円筒形に成型された硬
質の熱可塑性合成樹脂製のパイプ(5)を、当該熱可塑
性合成樹脂のビカット軟化点付近の温度で扁平に折畳ん
でおき、そのパイプ(5)を前記熱可塑性合成樹脂のビ
カット軟化点より十分に低く且つ変形可能の温度に加温
して、扁平状態のままで断面略V字状乃至U字状に彎曲
せしめ、その彎曲したパイプ(5)を管路(9)内に挿
通し、次いでそのパイプ(5)を前記彎曲時の温度より
も高い温度にまで加熱しつつ内圧をかけて膨ませること
を特徴とする、管路内管の形成方法
1. A pipe (5) made of a hard thermoplastic synthetic resin formed into a cylindrical shape by extrusion molding is flatly folded at a temperature near the Vicat softening point of the thermoplastic synthetic resin, and the pipe is then folded. (5) is heated to a temperature that is sufficiently lower than the Vicat softening point of the thermoplastic synthetic resin and is deformable, and is bent into a substantially V-shaped or U-shaped cross section in a flat state, and the bent pipe The pipe (5) is inserted through the pipe (9), and then the pipe (5) is heated to a temperature higher than the temperature at the time of bending to expand by applying internal pressure. Tube formation method
JP5024193A 1993-02-15 1993-02-15 Method of forming pipe in conduit Expired - Lifetime JP3417592B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5024193A JP3417592B2 (en) 1993-02-15 1993-02-15 Method of forming pipe in conduit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5024193A JP3417592B2 (en) 1993-02-15 1993-02-15 Method of forming pipe in conduit

Publications (2)

Publication Number Publication Date
JPH06241348A true JPH06241348A (en) 1994-08-30
JP3417592B2 JP3417592B2 (en) 2003-06-16

Family

ID=12853502

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5024193A Expired - Lifetime JP3417592B2 (en) 1993-02-15 1993-02-15 Method of forming pipe in conduit

Country Status (1)

Country Link
JP (1) JP3417592B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11342540A (en) * 1998-04-02 1999-12-14 Tokyo Gas Co Ltd Method for inserting lining plastic pipe into pipeline
JP2013148314A (en) * 2012-01-23 2013-08-01 Yamakoshi:Kk Recycled material for existing pipe conduit, method for laying heat exchanger using the same, and sewer pipe exhaust heat utilization system
JP2014097611A (en) * 2012-11-14 2014-05-29 Ashimori Ind Co Ltd Installation method of lining material
JP2016098924A (en) * 2014-11-25 2016-05-30 芦森工業株式会社 Pipe passage and its lining method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11342540A (en) * 1998-04-02 1999-12-14 Tokyo Gas Co Ltd Method for inserting lining plastic pipe into pipeline
JP2013148314A (en) * 2012-01-23 2013-08-01 Yamakoshi:Kk Recycled material for existing pipe conduit, method for laying heat exchanger using the same, and sewer pipe exhaust heat utilization system
JP2014097611A (en) * 2012-11-14 2014-05-29 Ashimori Ind Co Ltd Installation method of lining material
JP2016098924A (en) * 2014-11-25 2016-05-30 芦森工業株式会社 Pipe passage and its lining method

Also Published As

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