JPS58222816A - Coating inner surface of conduit - Google Patents
Coating inner surface of conduitInfo
- Publication number
- JPS58222816A JPS58222816A JP57105493A JP10549382A JPS58222816A JP S58222816 A JPS58222816 A JP S58222816A JP 57105493 A JP57105493 A JP 57105493A JP 10549382 A JP10549382 A JP 10549382A JP S58222816 A JPS58222816 A JP S58222816A
- Authority
- JP
- Japan
- Prior art keywords
- conduit
- jig
- tubular film
- film
- lining material
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/26—Lining or sheathing of internal surfaces
- B29C63/34—Lining or sheathing of internal surfaces using tubular layers or sheathings
- B29C63/341—Lining or sheathing of internal surfaces using tubular layers or sheathings pressed against the wall by mechanical means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、導管内面の被覆方法、とくには都市ガス、水
道１石油等の各種既設輸送用導管の内面を補修もしくは
防食加工等のために被覆する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of coating the inner surface of a conduit, and particularly to a method of coating the inner surface of various existing transportation conduits such as city gas, water, petroleum, etc. for repair or anti-corrosion treatment. .
従来、この種の導管の内面被覆方法としては、＜１）
防食ライニング材を多量の圧縮空気を用いて管内に送
入し、内面のライニングを行なう方法。Conventionally, methods for coating the inner surface of this type of conduit include <1)
A method in which anti-corrosion lining material is introduced into the pipe using a large amount of compressed air to line the inner surface.
（２） ポリエチレン等の可撓性チューブを導管内に
挿入する方法。(2) A method of inserting a flexible tube such as polyethylene into the conduit.
（３） 内面に予め接着剤を塗布しておいて管状フィ
ルムを導管内に挿入し、導管内で管状フィルムを反転移
動させながら圧縮空気によって管内面に接着させる方法
。(3) A method in which the inner surface of the tube is coated with an adhesive in advance, a tubular film is inserted into the conduit, and the tubular film is reversely moved within the conduit while being adhered to the inner surface of the tube using compressed air.
（４）上記において、圧縮空気を用いる代りに、ワイＸ
７−で管状フィルムを引張って接着させる方法。(4) In the above, instead of using compressed air,
7- Method of stretching and adhering a tubular film.
（５） 予め導管内に不織布の様な易含浸性のチュー
ブを挿入し、次にチューブ内面に接着剤を塗布、含浸さ
せ、更にその塗布面を可撓性チューブで被覆する方法、
等が知られている。しかし、（１）の方法は、水道管の
様に比較的高圧の導管や、口径の小さい導管には良いが
、腐食孔のある導管、低圧導管１口径の大きい導管等に
対しては圧縮空気の圧力を高くし、且つ多量に送入する
必要があるため、装置一式が大樹りとなって不経済であ
り、また、狭い場所での修理が困難である。更に、腐食
孔があるときは、孔を塞ぐことが出来ない。（２）の方
法は、導管が直線状の場合は可能であるが、曲管や支管
が多数ある地中埋設管等には適用できない。（３）の方
法は、例えば口径が３００〜５００ｍｍもある様な大口
径の直管には実用されているが、小口径の導管、支管や
曲りの多い導管には適用できない。（４）の方法も同様
で、直管部分では実際に使われているが、支管や曲りの
多い導管ではワイヤーの引張り抵抗が大きくなるため実
用困難であり、却ってワイＡ７−の切断にＪ−り導管を
詰らせる恐れがある。（５）の方法も人［１径管では使
用可能であるが、小口径管や曲りの多い導管での適用は
困難である。(5) A method of inserting an easily impregnable tube such as a nonwoven fabric into a conduit in advance, then applying and impregnating the inner surface of the tube with an adhesive, and then covering the coated surface with a flexible tube;
etc. are known. However, method (1) is good for relatively high-pressure pipes such as water pipes and small-diameter pipes, but it is not suitable for pipes with corroded holes, low-pressure pipes, and large-diameter pipes, etc. Since it is necessary to increase the pressure and feed in large quantities, the complete equipment becomes a large tree, which is uneconomical, and it is difficult to repair in a narrow space. Furthermore, when there are corrosion holes, the holes cannot be plugged. Method (2) is possible when the conduit is straight, but cannot be applied to underground pipes that have many curved pipes or branch pipes. The method (3) is practically used for large-diameter straight pipes, such as those with a diameter of 300 to 500 mm, but cannot be applied to small-diameter conduits, branch pipes, or conduits with many bends. Method (4) is similar, and is actually used for straight pipes, but it is difficult to put into practice in branch pipes or conduits with many bends because the tensile resistance of the wire increases, and on the contrary, it is not suitable for cutting wire A7-. There is a risk of clogging the pipes. The method (5) can also be used with a single-diameter pipe, but it is difficult to apply it to a small-diameter pipe or a conduit with many bends.
本発明は、以上の様な従来の不利に鑑み、その解決のた
めに鋭意研究の結果達成された、新規な導管内面の被覆
方法を提供するもので、導管内にライニング材を注入し
た後、前記導管内に後方に管状フィルムを牽引する第１
の押し冶具を挿通し、次いで前記管状フィルム内に第２
の押し治具を挿通して管状フィルムを拡開さぜ、導管内
面に接着させる方法に係わる。本発明の方法によれば、
従来の欠点を克服覆るだ（〕でなく、導管内面の被覆加
１′！″同時■食孔０補１行な計が員６ 、 、
。In view of the above-mentioned conventional disadvantages, the present invention provides a novel method for coating the inner surface of a conduit, which was achieved as a result of intensive research to solve the problem. a first pulling the tubular film backwards into the conduit;
A second pushing jig is inserted into the tubular film.
This involves a method of inserting a pushing jig to expand the tubular film and bonding it to the inner surface of the conduit. According to the method of the invention,
It overcomes the drawbacks of the conventional method (instead of covering it), but adds coating to the inner surface of the conduit 1'!'' At the same time ■ 0 holes and 1 line, total of 6.
.
ため、都市ガス、水道９石油等の各種既設輸送用導管、
とくには小口径管、曲りや分岐の多い導管等の修理、加
工にも広く適用することができる。Therefore, various existing transportation pipes such as city gas, water, 9 petroleum, etc.
In particular, it can be widely applied to the repair and processing of small diameter pipes and conduits with many bends and branches.
次に、本発明の一例を添付した図面に基づいて説明する
゛。第１図ないし第５図は本発明による施工の手順を略
示ケる導管の縦断面図である。施工に当っては、先ず導
管１の入口３よりホース５の挿入等の適当な手段により
適当な加圧手段例えば加圧空気などによりライニング材
７を導管１内に充分行き口らせる様に注入する。次に、
導管１の内径より梢々小なる外径を有する第１の押し冶
具９を入口３より導管１内に挿入する。（ライニング材
７は押し冶具９の導管内挿入後に、枝管１０より注入し
ても良い）押し治具９の後部には、適当な係止具１１を
介してロール状または折り畳まれた管状フィルム１３が
接続されているため、これを適所に設けた保持手段、（
図ではマンボール１４に設けたアンリール１５）に装着
する。この状態が入口３よりボース５を導管１内に挿入
し、空気等の加圧流体を送入づると、押し治具９は加圧
空気によって出口１７に向けて押圧移動する。Next, an example of the present invention will be explained based on the attached drawings. 1 to 5 are longitudinal sectional views of a conduit, schematically showing the construction procedure according to the present invention. During construction, first, the lining material 7 is injected into the conduit 1 by an appropriate means such as insertion of a hose 5 through the inlet 3 of the conduit 1 using an appropriate pressurizing means such as pressurized air so that the lining material 7 is sufficiently introduced into the conduit 1. do. next,
A first pushing jig 9 having an outer diameter smaller than the inner diameter of the conduit 1 is inserted into the conduit 1 through the inlet 3. (The lining material 7 may be injected from the branch pipe 10 after the pushing jig 9 is inserted into the conduit.) At the rear of the pushing jig 9, a rolled or folded tubular film is attached via a suitable locking tool 11. 13 is connected, the holding means with this in place, (
In the figure, it is attached to an unreel 15) provided on a man ball 14. In this state, when the boss 5 is inserted into the conduit 1 through the inlet 3 and pressurized fluid such as air is fed, the pushing jig 9 is pushed toward the outlet 17 by the pressurized air.
すると、押し治具９によって予め導管１内に注入してあ
ったライニング材７が導管１の内壁面全体に一様に分配
されて塗膜を形成すると共に、押し冶具９の後方に連な
る管状フィルム１３がアンリール１５より展延される。Then, the lining material 7 previously injected into the conduit 1 by the pushing jig 9 is uniformly distributed over the entire inner wall surface of the conduit 1 to form a coating film, and the tubular film that continues behind the pushing jig 9 is uniformly distributed over the entire inner wall surface of the conduit 1. 13 is unrolled from the unreel 15.
押し治具９が過剰のライニング材７と共に出口１７から
押出されると、管状フィルム１３だ１ノは導管１内を挿
通した状態で残される。そこで、管状フィルム１３の後
部開口端１９より管内に第２の押し治具２１を挿入し、
その後方より前回と同様ホース５等の送入手段により再
び空気等の加圧流体を送入する。すると、押し治具２１
は管状フィルム１３を拡開しながら導管１内を出口１７
の方向へ移動する。押し治具２１の移動につれて、ライ
ニング材７と管状フィルム１３とは一体となり、導管１
の内壁面に均一に接着し被覆層２３を形成し、腐食孔２
５の封止と共に防食加工を完了する。When the pushing jig 9 is pushed out of the outlet 17 together with the excess lining material 7, the tubular film 13 remains inserted through the conduit 1. Therefore, a second pushing jig 21 is inserted into the tube from the rear open end 19 of the tubular film 13,
Pressurized fluid such as air is again fed from behind by the feeding means such as the hose 5 as before. Then, the push jig 21
is the outlet 17 inside the conduit 1 while expanding the tubular film 13.
Move in the direction of. As the pushing jig 21 moves, the lining material 7 and the tubular film 13 become integrated, and the conduit 1
The coating layer 23 is formed by adhering uniformly to the inner wall surface of the corrosion hole 2.
The anti-corrosion process is completed with the sealing in step 5.
上記の施工に際し、管状フィルム１３の拡開を、第２の
押し治具２１を使わ、ずに加圧空気で行なうと、曲管部
分での拡開が均一に行なわれず、管状フィルム１３が折
り曲げられて流路を閉塞する恐れがあるほか、予め内壁
面にライニングされてぃるライニング材７と均一に接着
しないという欠点があり、好ましくない。During the above construction, if the tubular film 13 is expanded using pressurized air without using the second pushing jig 21, the expansion will not be uniform in the curved pipe portion, and the tubular film 13 will be bent. This is undesirable because it has the disadvantage that it may clog the flow path and that it does not adhere uniformly to the lining material 7 that has been lined on the inner wall surface in advance.
本発明にＪ３いて用いられるライニング材としては、エ
ポキシ、ポリエステル、ウレタン、アクリル、またはポ
リサルファイド等の熱硬化性または室温硬化性樹脂から
成る接着剤が挙げられるが、とくには１０．０００〜１
００．０００ｅｐｃの粘度を有するものが良く、またベ
ース樹脂としては分子量の高い樹脂を一部に混入したも
の、即ち、エポキシ樹脂の場合には、エビュー１〜８１
５．８２８．１００１ （以上、油化シェルエポキシ社
製）やＧＹ−２５２，ＧＦ−２５０，ＧＹ−２６０（以
上ヂバガイギー社製）などが一般に使用されるが、地震
等による導管の屈曲に対する配慮から硬化後も可撓性を
有づるライニング材である。１゜２エポキシ化ポリブタ
ジエンとビスフェノールＡ型エポキシ樹脂（例えば、日
本ソーダ社製ＥＰＢ−１３，ＥＰＢ−１７，ＦＲＢ−１
４など）とのｇ１用が望ましい。なお、これらの硬化剤
には、ポ※４
））リアミドアミン、変性ポリアミン、脂環式ポリアミ
ン等一般に使用されるエポキシ硬化剤が用いられる。Examples of the lining material used in the present invention include adhesives made of thermosetting or room temperature curing resins such as epoxy, polyester, urethane, acrylic, or polysulfide;
A base resin having a viscosity of 0.00.000 epc is preferable, and in the case of a base resin partially mixed with a high molecular weight resin, that is, an epoxy resin, Evue 1 to 81 is preferable.
5.828.1001 (manufactured by Yuka Shell Epoxy Co., Ltd.), GY-252, GF-250, GY-260 (manufactured by Jiba Geigy Co., Ltd.), etc. are generally used, but in consideration of bending of the conduit due to earthquakes etc. This lining material remains flexible even after hardening. 1゜2 epoxidized polybutadiene and bisphenol A type epoxy resin (for example, EPB-13, EPB-17, FRB-1 manufactured by Nippon Soda Co., Ltd.)
4 etc.) is preferable for g1. Note that commonly used epoxy curing agents such as polyamidoamine, modified polyamine, and alicyclic polyamine are used as these curing agents.
また、導管内に挿入して被覆層を形成づる管状フィルム
としては、導管の内径と同等もしくはこれより僅かに小
なる外径を有するナイロン、ポリエステル、ポリエチレ
ン、塩化ビニール等の可撓性を有する熱可塑性樹脂フィ
ルムが用いられる。In addition, the tubular film that is inserted into the pipe to form a coating layer may be a flexible thermoplastic film such as nylon, polyester, polyethylene, or vinyl chloride, which has an outer diameter equal to or slightly smaller than the inner diameter of the pipe. A plastic resin film is used.
更に、第１おにび第２の押し冶具は導管の内径よりも僅
かに小なる外径を有づるブロック状のものであるが、押
圧により容易に移動可能な表面が平滑で軽量のものが良
い。また、これらの押し治具を導管内に挿通するだめの
手段としては、加圧流体、とくに加圧空気が用いられ、
ライニング材として熱硬化性樹脂□を使用すると基は、
加熱したものを使用°りることができる。Furthermore, the first and second pushing jigs are block-shaped with an outer diameter slightly smaller than the inner diameter of the conduit, but they are lightweight and have smooth surfaces that can be easily moved by pressing. good. In addition, pressurized fluid, especially pressurized air, is used as a means for inserting these pushing jigs into the conduit.
When thermosetting resin□ is used as a lining material, the base is
It can be used heated.
次に、本発明の実施例および比較例を示す。Next, Examples and Comparative Examples of the present invention will be shown.
（施■条ｆＩ ）別表の通り （施工方法〉実施例１〜３１”’□ 前述した本発明の施工手順で行なった。(Article fI) As per the attached table (Construction method) Examples 1 to 31”’□ The construction procedure of the present invention described above was used.
（以下余白）
比較例１
治具及び接着剤を導管内に挿入し、ワイＡ７−で冶具を
牽引して接着剤を導管内壁面に塗布し、ライニングした
後、管状フィルムをワイヤーで引張り、加圧空気を使っ
て膨まず。(Leaving space below) Comparative Example 1 A jig and adhesive were inserted into a conduit, the jig was pulled with a wire A7-, the adhesive was applied to the inner wall of the conduit, and after lining, the tubular film was stretched with a wire and processed. Do not inflate using compressed air.
比較例２
治具及び接着剤を導管内に挿入し、１．０Ｋ（１／ ｃ
ｍ２の加圧空気で治具を圧送し、接着剤を導管内壁面に
塗布。ライニングした後、管状フィルムを２ 、 ＯＫ
（１／ｃｍ２の加圧空気で導管内に圧送し、更に２ 、
０ Ｋｇ／ｃｍ２の加圧空気で拡開する。Comparative Example 2 Insert the jig and adhesive into the conduit and apply 1.0K (1/c
The jig is pumped with m2 of pressurized air and the adhesive is applied to the inner wall of the conduit. After lining the tubular film 2, OK
(Pulse the air into the conduit with pressurized air at 1/cm2, and
Expands with pressurized air of 0 Kg/cm2.
（結 果）
実施例１
導管内に均一にフィルムが接着され、腐食孔をすべてシ
ーされた、耐圧性は１０Ｋ（１／ｃｍ２まで合格。屈曲
性は６０°まで漏水なし。(Results) Example 1 A film was uniformly adhered to the inside of the conduit, and all corrosion holes were sealed. Pressure resistance passed up to 10K (1/cm2). Flexibility up to 60° without water leakage.
実施例２
導管内に均一にフィルムが接着され、曲部での剥離もな
く、耐圧性は５Ｋ（１／Ｃｍ２まで合格。屈曲性は７５
°まで漏水なし。Example 2 The film was adhered uniformly inside the conduit, there was no peeling at curved parts, and the pressure resistance passed up to 5K (1/Cm2. Flexibility was 75
No leakage up to °.
実施例３
導管内に均一にフィルムが拡開接着し、腐食孔もずべて
完全にシールされた、耐圧性は５に！＋／Ｃｍ２まで合
格。屈曲性は６０°ま″ｃ漏水なく良好であった。Example 3 The film spreads and adheres uniformly inside the conduit, all corrosion holes are completely sealed, and the pressure resistance is 5! Passed up to +/Cm2. Flexibility was good up to 60° with no water leakage.
比較例１
ワイヤーが牽引力６００Ｋ（Ｊで切断し、治具が導管の
途中で支えて失敗。腐食孔は５個の内４個たけシールし
ただけぐあった。フィルムが接着した部分を取出して試
験したところ、耐圧性は２Ｋｇ／ｃｍ２で漏水が発生し
、屈曲性は３０°でライニング層と共にフィルムが破断
した。Comparative Example 1 The wire was cut with a pulling force of 600K (J, and the jig supported it in the middle of the conduit and failed. Four of the five corrosion holes were sealed. The part where the film was bonded was taken out and tested. However, water leakage occurred when the pressure resistance was 2 Kg/cm2, and the film broke along with the lining layer when the bendability was 30°.
比較例２
管状フィルムの圧送に時間がかかり実用性に乏しい。曲
部でのフィルムの接着が悪く、流路が閉塞し１〔。フィ
ルムの接着の良好な部分についての測定結果は耐圧性が
２Ｋｇ／ｃｍ２で漏水が発生、屈曲性は４０°でライニ
ング層と共にフィルムがン破断した。Comparative Example 2 It takes a long time to force-feed the tubular film, so it is not practical. The adhesion of the film at the bend was poor and the flow path was blocked [1]. The measurement results for the well-adhesive parts of the film were that water leakage occurred when the pressure resistance was 2 Kg/cm2, and the film broke along with the lining layer when the bendability was 40°.
（屈曲性の測定法）
一定の長さの導管に水を充たして、その両端部の上面を
２個の支点で支持し、導管の中央部上面に一定の圧を加
えて観察し、漏水した時の導管の屈曲角を測定し、測定
前（１８０°）との差で表わす。(Method for measuring bendability) A conduit of a certain length is filled with water, the upper surface of both ends of the conduit is supported by two fulcrums, and a certain pressure is applied to the upper surface of the central part of the conduit to observe the leakage. The bending angle of the conduit at this time is measured and expressed as the difference from before measurement (180°).
以上の如く、本発明によれば、従来困難であった内径１
０〜５０φ程度の小口径管２曲りや分岐の多い導管等に
おける腐食孔の補修や腐食加工等が容易に行なえるほか
、本発明の方法によって施工された導管は耐屈折性を有
するため、地震の際や、地上における重量型の通行に際
しての耐久性にも秀れているため、地中埋設輸送用導管
のみでなく化学工場等の各種配管に対しても適用Ｃきる
等の多大の効果を奉する。As described above, according to the present invention, the inner diameter 1
Corrosion holes can be repaired and corroded easily in small-diameter pipes of about 0 to 50φ with 2 bends and many branches.In addition, the pipes constructed by the method of the present invention have bending resistance, so they can withstand earthquakes. Because it has excellent durability when heavy objects are transported above ground, it can be applied not only to underground transportation conduits but also to various types of piping in chemical factories, etc., and has great effects. Serve.
本発明による施工の手順を略示する導管の縦断面図であ
る。第１図は手順の縦断面図、第２図は手順の縦断面図
、第３図は手順３の縦断面図、第４図は手順４の縦断面
図、第５図は手順５の縦断面図である。
第１図
第２図
第３図
第４図
第５図
ｚ”） ２１
訴1 is a longitudinal sectional view of a conduit schematically illustrating the construction procedure according to the present invention. FIG. Figure 1 is a vertical sectional view of the procedure, Figure 2 is a vertical sectional view of the procedure, Figure 3 is a vertical sectional view of step 3, Figure 4 is a vertical sectional view of step 4, and Figure 5 is a vertical sectional view of step 5. It is a front view. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 z") 21 Complaint
Claims (5)
管内に後方に管状フィルムを牽引する第１の押し治具を
挿通し、次いで前記管状フィルム内に第２の押し治具を
挿通して管状フィルムを拡開させ、導管内面に接着させ
ることたを特徴とする導管内面の被覆方法。(1) After injecting the lining agent into the conduit, insert a first pushing jig that pulls the tubular film backward into the conduit, and then insert a second pushing jig into the tubular film. 1. A method for covering the inner surface of a conduit, comprising expanding a tubular film and adhering it to the inner surface of the conduit.
よりも小なる外径を有するブロック状のものであること
を特徴する特許請求の範囲第１項に記載の方法。(2) The method according to claim 1, wherein the first and second pushing jigs are block-shaped having an outer diameter smaller than the inner diameter of the conduit.
挿通を、導管の一端よりの加圧流体の送入により行なう
ことを特徴とする特許請求の範囲第１項に記載の方法。(3) The method according to claim 1, wherein the first and second pushing jigs are inserted into the conduit by feeding pressurized fluid from one end of the conduit. .
はこれより僅かに小なる外径を有し、ナイロン。 ポリエステル、ポリエチレン、塩化ビニール等の熱可塑
性樹脂フィルムから成ることを特徴とする特許請求の範
囲第１項に記載の方法。(4) The tubular film has an outer diameter equal to or slightly smaller than the inner diameter of the conduit, and is nylon. The method according to claim 1, characterized in that it is made of a thermoplastic resin film such as polyester, polyethylene, vinyl chloride, etc.
ル、ウレタン、アクリル、ポリサルファイド等の熱また
は室温硬化性樹脂材料から成る接着剤であることを特徴
とする特許請求の範囲第１項に記載の方法。(5) The method according to claim 1, wherein the lining material is an adhesive made of a heat- or room-temperature-curable resin material such as epoxy, polyester, urethane, acrylic, or polysulfide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57105493A JPS58222816A (en) | 1982-06-21 | 1982-06-21 | Coating inner surface of conduit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57105493A JPS58222816A (en) | 1982-06-21 | 1982-06-21 | Coating inner surface of conduit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58222816A true JPS58222816A (en) | 1983-12-24 |
Family
ID=14409119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57105493A Pending JPS58222816A (en) | 1982-06-21 | 1982-06-21 | Coating inner surface of conduit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58222816A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11227046A (en) * | 1998-02-17 | 1999-08-24 | Osaka Gas Co Ltd | Method for lining in tube |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5432579A (en) * | 1977-08-18 | 1979-03-09 | Osaka Gas Co Ltd | Inner lining of conduit already constructed |
| JPS5476643A (en) * | 1977-11-30 | 1979-06-19 | Osaka Gas Co Ltd | Lining of inner surface of conduit already constructd |
-
1982
- 1982-06-21 JP JP57105493A patent/JPS58222816A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5432579A (en) * | 1977-08-18 | 1979-03-09 | Osaka Gas Co Ltd | Inner lining of conduit already constructed |
| JPS5476643A (en) * | 1977-11-30 | 1979-06-19 | Osaka Gas Co Ltd | Lining of inner surface of conduit already constructd |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11227046A (en) * | 1998-02-17 | 1999-08-24 | Osaka Gas Co Ltd | Method for lining in tube |
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