JPH10185078A - Method of internal surface corrosion-proof painting on cast iron pipe - Google Patents
Method of internal surface corrosion-proof painting on cast iron pipeInfo
- Publication number
- JPH10185078A JPH10185078A JP34227296A JP34227296A JPH10185078A JP H10185078 A JPH10185078 A JP H10185078A JP 34227296 A JP34227296 A JP 34227296A JP 34227296 A JP34227296 A JP 34227296A JP H10185078 A JPH10185078 A JP H10185078A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- cement
- iron pipe
- painting
- coating
- 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
Links
Landscapes
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、鋳鉄管の内面防食塗
装方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for anticorrosion coating of a cast iron pipe.
【０００２】[0002]
【従来の技術】一般に鋳鉄管内面には水質衛生面に優
れ、かつ防食性、外観の良好なライニングが施される。2. Description of the Related Art Generally, the inner surface of a cast iron pipe is provided with a lining which is excellent in water quality and hygiene, and has good corrosion resistance and appearance.
【０００３】この鋳鉄管の内面防食ライニングとして
は、セメントモルタルライニング、樹脂粉体塗装、液状
樹脂塗装などがある。これらの内、衛生面、防食性能に
最も優れるのが樹脂粉体塗装であるが、これによる防食
塗装を行うには下地が平滑面とされている必要がある。[0003] As the inner corrosion prevention lining of this cast iron pipe, there are cement mortar lining, resin powder coating, liquid resin coating and the like. Among these, resin powder coating is the most excellent in hygiene and anticorrosion performance. However, in order to perform anticorrosion coating by this, it is necessary that the base material be a smooth surface.
【０００４】ところが、鋳鉄管は大径管となるほど内面
に鋳物独特のシワ、凹凸が発生し、これを研磨工程で完
全に除去するには多大な労力と時間とを必要とし、実用
はほとんど不可能となる問題があった。However, as the diameter of the cast iron pipe increases, wrinkles and irregularities unique to the casting are generated on the inner surface, and a great deal of labor and time are required to completely remove the wrinkles and irregularities in the polishing process. There was a possible problem.
【０００５】一方、上記シワ、凹凸はセメントライニン
グ層の場合は容易に被覆でき、結果的に管内面を平滑な
表面とできる。従って、セメントライニング層上に上述
の樹脂粉体塗料によるライニング層を設ければ互いの利
点と欠点とが補われ、防食効果に優れる複合ライニング
層が設けられると考えられる。On the other hand, the above wrinkles and irregularities can be easily covered in the case of a cement lining layer, and as a result, the inner surface of the pipe can be made a smooth surface. Therefore, it is considered that providing the lining layer made of the above resin powder coating on the cement lining layer compensates for each other's advantages and disadvantages, and provides a composite lining layer having an excellent anticorrosion effect.
【０００６】しかし、樹脂粉体塗料による塗装には、下
地を180 〜220 °C の高温に加熱する必要がある。従っ
て、この予備加熱時にセメントライニング層が著しく熱
劣化し、クラックや剥離などを生じてせっかくのセメン
トライニングを施した意味がなくなってしまう問題があ
った。[0006] However, coating with a resin powder coating requires heating the substrate to a high temperature of 180 to 220 ° C. Accordingly, there is a problem that the cement lining layer is significantly thermally degraded at the time of the preheating, cracks and peeling are caused, and there is a problem that it is meaningless to perform the cement lining.
【０００７】そこで、本願出願人は、セメントライニン
グの熱影響を避けてその表面に粉体樹脂塗装を施す手段
として、セメントライニング表面に樹脂などの樹脂粉体
塗料を溶射ガンにより吹きつけて塗装する方法を提案し
た。In view of the above, the applicant of the present application has applied a resin powder coating such as a resin to the surface of the cement lining by spraying with a spray gun as a means for applying a powder resin coating to the surface of the cement lining while avoiding the thermal influence of the cement lining. A method was proposed.
【０００８】[0008]
【発明が解決しようとする課題】上記手段によりセメン
トライニングと樹脂粉体塗装との欠点を互いに補い両者
の利点を生かした相乗効果が得られるに至ったのである
が、溶融した樹脂粉体塗料が、セメントライニング表面
に付着した瞬間、常温まで急冷されるので、樹脂塗料の
種類によっては硬化不良を起こす場合があった。Although the above-mentioned means compensated for the disadvantages of the cement lining and the resin powder coating and provided a synergistic effect utilizing the advantages of both, the molten resin powder coating was not used. As soon as it adheres to the surface of the cement lining, it is rapidly cooled to room temperature, and depending on the type of resin coating, curing failure may occur.
【０００９】従って、上記方法により内面防食塗装を行
う場合、樹脂の種類、配合について留意しなければなら
ない問題が生じた。この発明は上記問題点を解消するこ
とを目的としてなされたものであって、樹脂の種類を問
わず溶射ガンによる粉体塗装を可能とすることを目的と
してなされたものである。Therefore, when the internal anticorrosion coating is performed by the above-mentioned method, there arises a problem that the type and composition of the resin must be considered. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has been made to enable powder coating by a thermal spray gun regardless of the type of resin.
【００１０】[0010]
【課題を解決するための手段】すなわち、この発明の鋳
鉄管の内面防食塗装方法は、内面セメントライニングを
施した鋳鉄管のセメントライニング層表面を、表面温度
が80〜90°Ｃとなるように熱射加熱し、その直後層表面
に樹脂粉体塗料を溶射ガンの炎中で溶融させつつ噴射塗
装することを特徴とするものである。That is, according to the present invention, there is provided a method for anticorrosion coating of a cast iron pipe according to the present invention, wherein the surface temperature of a cement lining layer of a cast iron pipe provided with an internal cement lining is adjusted to 80 to 90 ° C. It is characterized in that it is heated by heating and immediately after that, the resin powder coating is spray-coated on the layer surface while being melted in the flame of a thermal spray gun.
【００１１】[0011]
【作用】この発明において、セメントライニング層の厚
さは、鋳鉄管表面に特有にあらわれるシワ、凹凸を隠し
表面が均一になる程度で良く、これらを隠蔽できる厚さ
であれば薄くても十分である。In the present invention, the thickness of the cement lining layer may be such that wrinkles and irregularities peculiar to the surface of the cast iron pipe are concealed and the surface is made uniform. is there.
【００１２】従って、このセメントライニングによって
鋳鉄管表面は、研磨処理することなく平滑とされ、樹脂
粉体塗料に適した下地面となる。一方、樹脂粉体塗料を
塗布するには下地を加熱する必要があるが、樹脂粉体塗
料を溶射ガンの炎中で溶融させつつ噴射塗装するため、
下地加熱温度は通常の樹脂粉体塗装に比べはるかに低い
80〜90°Ｃ程度で十分である。Accordingly, the surface of the cast iron pipe is made smooth by the cement lining without polishing, and becomes a base surface suitable for resin powder coating. On the other hand, in order to apply the resin powder paint, it is necessary to heat the base, but because the resin powder paint is melted in the flame of the spray gun and spray-coated,
Substrate heating temperature is much lower than normal resin powder coating
About 80 to 90 ° C is sufficient.
【００１３】この温度範囲とする理由は、80°Ｃより低
いと、溶融樹脂の急冷による不利が生じ始め、90°Ｃよ
り高くすると樹脂硬化反応には好都合であるが、セメン
トライニングへの熱劣化の弊害が生じる。The reason for setting this temperature range is that if the temperature is lower than 80 ° C., disadvantages due to rapid cooling of the molten resin begin to occur. If the temperature is higher than 90 ° C., it is favorable for the resin curing reaction. The adverse effect of this occurs.
【００１４】従って、粉体樹脂の硬化反応に支障がな
く、しかもセメントライニングの熱劣化を生じない範囲
として上記範囲が最も好適であることによる。また、こ
の加熱はセメトライニングの表面のみで良く、層厚全体
にわたる温度とする必要はない。Therefore, the above range is the most preferable range in which the curing reaction of the powder resin is not hindered and the thermal deterioration of the cement lining does not occur. In addition, the heating need only be performed on the surface of the cemet lining, and does not need to be performed over the entire layer thickness.
【００１５】また、加熱を熱射によるものとするのは、
ライニング層表面を局部的に加熱するためであって、温
水加熱やオーブンによるキュア加熱などのライニング層
全体又は管全体の総合的加熱を除く趣旨である。Further, the heating is performed by heat radiation.
This is for locally heating the surface of the lining layer, and excludes comprehensive heating of the entire lining layer or the entire tube such as heating with hot water or curing with an oven.
【００１６】次に、樹脂粉体塗料を噴射する溶射ガンと
は、図３に示すように粉体塗料７を噴射する中心孔５Ａ
と、これを同心円状に囲む空気噴出環５Ｂ、燃焼ガス噴
出環５Ｃとからなる噴射ノズルの一種で、粉体塗料７を
空気５Ｅと燃焼ガス炎５Ｄの噴射雰囲気の中心から噴射
し、被塗物に付着する時点で粉体塗料を必要な溶融温度
にまで加熱するようにした塗装装置をいう。Next, the thermal spray gun for spraying the resin powder coating is, as shown in FIG.
Is a kind of an injection nozzle composed of an air ejection ring 5B and a combustion gas ejection ring 5C concentrically surrounding the same, and injects the powder coating material 7 from the center of the atmosphere of the air 5E and the combustion gas flame 5D. It refers to a coating apparatus that heats the powder coating to the required melting temperature when it adheres to the object.
【００１７】従って、樹脂粉体塗料は、塗装装置による
噴射の時点で加熱溶融され、これが表面加熱された被塗
物表面に付着するので、急冷されることなく被塗物表面
に強靱な塗膜を形成する。Accordingly, the resin powder coating is heated and melted at the time of injection by the coating apparatus, and adheres to the surface of the object to be heated, so that a tough coating film is formed on the surface of the object without being rapidly cooled. To form
【００１８】なお、上記樹脂粉体塗料には、エポキシ樹
脂粉体塗料のような熱硬化型樹脂粉体塗料の他、例えば
ポリエチレン樹脂粉末塗料、フッソ樹脂粉末塗料などの
熱可塑性樹脂粉体塗料なども使用可能である。The resin powder coating may be a thermosetting resin powder coating such as an epoxy resin powder coating, or a thermoplastic resin powder coating such as a polyethylene resin powder coating or a fluorine resin powder coating. Can also be used.
【００１９】[0019]
【実施例】次にこの発明の実施例を説明する。 ［実施例１］内径600mm の鋳鉄管１の内面を下地処理し
た後、該管１を回転させつつ内面にセメントモルタルを
供給し、遠心力によって厚さ約10mmの均一な層として硬
化させ、その後硬化したセメントモルタル層２表面を研
磨処理してレータンスを除去した。Next, an embodiment of the present invention will be described. [Example 1] After an inner surface of a cast iron tube 1 having an inner diameter of 600 mm was subjected to a base treatment, cement mortar was supplied to the inner surface while rotating the tube 1 and hardened as a uniform layer having a thickness of about 10 mm by centrifugal force. The surface of the hardened cement mortar layer 2 was polished to remove the loance.
【００２０】次いで、図１に示すように張り出したアー
ム３Ａの先端にプロパンバーナー４と溶射ガン５を配置
した移動台車３を用い、ローラ６、６により支持されて
回転する内面セメントライニング鋳鉄管１にアーム３Ａ
を挿入することにより管内面を加熱すると共に粒径40μ
と150 μのエポキシ樹脂粉体塗料を使用して塗装を行っ
た。Next, as shown in FIG. 1, an inner cement-lined cast iron pipe 1 supported by rollers 6, 6 and rotated using a moving carriage 3 having a propane burner 4 and a spray gun 5 disposed at the tip of an overhanging arm 3A. Arm 3A
To heat the inner surface of the tube by inserting
And 150 μm of epoxy resin powder coating.
【００２１】上記溶射ガン５の溶射条件及び塗装処理条
件は表１、表２の通りであった。Tables 1 and 2 show the spraying conditions and coating conditions of the spray gun 5.
【００２２】[0022]
【表１】溶射ガンの溶射条件 プロパン圧力 2.0kgf/cm2 酸 素 圧力 3.0kgf/cm2 溶射ガンの表面距離 15 cmTABLE 1 spraying conditions of the spray gun propane pressure 2.0 kgf / cm 2 oxygen pressure 3.0 kgf / cm surface distance 2 spray gun 15 cm
【００２３】[0023]
【表２】塗装処理条件 管回転数 7.4rpm 台車速度 7.1cm/分 バーナー種類 プロパンバーナー バーナーの表面距離 10cm 塗料吐出量 110g/分 目標塗膜厚 500μ 上記塗装時におけるセメントライニング層表面温度を測
定したところ最低80°Ｃ、最高90°C 平均で85°C であ
った。[Table 2] Coating conditions Tube rotation speed 7.4rpm Truck speed 7.1cm / min Burner type Propane burner Surface distance of burner 10cm Paint discharge amount 110g / min Target coating thickness 500μ Cement lining layer surface temperature during the above coating was measured However, the minimum was 80 ° C and the maximum was 90 ° C, and the average was 85 ° C.
【００２４】この塗装の結果、セメントモルタル層２表
面に図２に示すようにエポキシ樹脂塗料による塗膜７が
形成された。 ［実施例２］エポキシ樹脂粉体塗料に代えて熱可塑性の
ポリエチレン樹脂粉体塗料を用いた他は実施例１と同様
に鋳鉄管１内面の塗装を行った。As a result of this coating, a coating film 7 of an epoxy resin paint was formed on the surface of the cement mortar layer 2 as shown in FIG. [Example 2] The inner surface of the cast iron pipe 1 was coated in the same manner as in Example 1 except that a thermoplastic polyethylene resin powder coating was used instead of the epoxy resin powder coating.
【００２５】この塗装の結果、セメントモルタル層２表
面にポリエチレン樹脂塗料による塗膜７が形成された。 ［実施例３］エポキシ樹脂粉体塗料に代えて熱可塑性の
ポリエステル樹脂粉体塗料を用いた他は実施例１と同様
に鋳鉄管１内面の塗装を行った。As a result of this coating, a coating film 7 of a polyethylene resin paint was formed on the surface of the cement mortar layer 2. [Example 3] The inner surface of the cast iron pipe 1 was coated in the same manner as in Example 1 except that a thermoplastic polyester resin powder coating was used instead of the epoxy resin powder coating.
【００２６】この塗装の結果、セメントモルタル層２表
面にポリエステル樹脂塗料による塗膜７が形成された。 ［比較例１］実施例１と同じ内径1,000mm のセメントラ
イニング鋳鉄管１の内面に、プロパンバーナーによる加
熱を行うことなく直接樹脂を溶射ガン５で噴射すること
によって内面ライニングを終了した。 ［比較例２］実施例1 と同じ内径1,000mm のセメントラ
イニング鋳鉄管１の内面に、プロパンバーナーにより80
°C 以下の表面温度となるように加熱した他は実施例１
と同様溶射ガン５で噴射することによって内面ライニン
グを終了した。 ［比較例３］実施例1 と同じ内径1,000mm のセメントラ
イニング鋳鉄管１の内面に、プロパンバーナーにより10
0 °C 以上の表面温度となるように加熱した他は実施例
１と同様溶射ガン５で噴射することによって内面ライニ
ングを終了した。 ［比較例４］実施例１と同じ内径1,000mm の鋳鉄管の内
面を下地処理した後、該管を回転させつつ内面にセメン
トモルタルを供給し遠心力によって厚さ10mmの均一な層
として硬化させ、その後硬化したセメントモルタル層表
面を研磨処理してレータンスを除去した。As a result of this coating, a coating film 7 made of a polyester resin paint was formed on the surface of the cement mortar layer 2. [Comparative Example 1] The inner lining was completed by directly spraying a resin with a spray gun 5 on the inner surface of a cement-lined cast iron pipe 1 having the same inner diameter of 1,000 mm as in Example 1 without using a propane burner. [Comparative Example 2] An inner surface of a cement-lined cast iron pipe 1 having an inner diameter of 1,000 mm as in
Example 1 except that the surface temperature was not more than ° C.
The inner lining was completed by spraying with the thermal spray gun 5 in the same manner as described above. [Comparative Example 3] The same inner surface of a cement-lined cast iron pipe 1 having an inner diameter of 1,000 mm as in Example 1 was
Except for heating to a surface temperature of 0 ° C. or higher, the inner lining was completed by spraying with the thermal spray gun 5 as in Example 1. [Comparative Example 4] After the inner surface of a cast iron pipe having an inner diameter of 1,000 mm, which was the same as that of Example 1, was ground, a cement mortar was supplied to the inner surface while rotating the pipe, and the layer was hardened as a uniform layer having a thickness of 10 mm by centrifugal force. Thereafter, the hardened cement mortar layer surface was polished to remove the loance.
【００２７】その後、管全体を220 °C に加熱し、ポリ
エチレン樹脂よりなる粉体塗料を散布供給し遠心力によ
って平均層とし、鋳鉄管の内面ライニングを終了した。
実施例１〜３及び比較例１〜４について、ライニング層
の密着力試験、外観比較をしたところ表３の結果となっ
た。Thereafter, the entire tube was heated to 220 ° C., and a powder coating made of polyethylene resin was sprinkled and supplied to form an average layer by centrifugal force, and the inner lining of the cast iron tube was completed.
The results of Table 3 were obtained by performing an adhesion test of the lining layer and comparing the appearances of Examples 1 to 3 and Comparative Examples 1 to 4.
【００２８】なお、密着力はライニング層表面にエルコ
メーター社製引張端子をエポキシ径接着剤で接着し、試
験機にて引張ることにより測定した。The adhesion was measured by attaching a tensile terminal manufactured by Elcometer Co., Ltd. to the surface of the lining layer with an epoxy diameter adhesive and pulling the tensile terminal with a tester.
【００２９】[0029]
【表３】 密着強度 外観比較 実施例１ 22.5Kgf/cm2以上 良 好 実施例２ 同 上 同 上 実施例３ 同 上 同 上 比較例１ 11.8Kgf/cm2 表面艶無し 比較例２ 15.0 kgf/cm2 表面艶無し 比較例３ 18.2Kgf/cm2 良 好 比較例４ 0.5 kgf/cm2 良 好 表３における密着強度試験では実施例１〜３ではセメン
トライニング層が破壊し、また実施例１で粒径40μと15
0 μのエポキシ樹脂粉体塗料ではいずれも密着強度の点
では遜色なかった。ただし、外観の点では粒径40μのほ
うが滑らかな外観となった。[Table 3] Adhesion strength Appearance comparison Example 1 22.5 kgf / cm 2 or more Good Example 2 Same as above Same as above Example 3 Same as above Same as above Comparative example 1 11.8 kgf / cm 2 No surface gloss Comparative example 2 15.0 kgf / cm 2 surface gloss without Comparative example 3 18.2Kgf / cm 2 good good Comparative example 4 0.5 kgf / cm 2 good good Table cement lining layer in examples 1 to 3 in the adhesion strength test in 3 is destroyed, also in example 1 Particle size 40μ and 15
All of the epoxy resin powder coatings of 0 μ were comparable in terms of adhesion strength. However, in terms of external appearance, a particle diameter of 40 μ had a smoother appearance.
【００３０】比較例１の密着強度試験では塗膜が破壊し
た。表３より明らかなように、密着強度はセメントライ
ニング層表面に常温（比較例１）〜低温加熱（比較例
２）下で粉体樹脂塗料を噴射した場合、または高温（比
較例３、４）下で粉体樹脂塗料を噴射した場合より実施
例１〜３の密着強度はかなり優れることが判明した。In the adhesion strength test of Comparative Example 1, the coating film was broken. As is clear from Table 3, the adhesion strength is obtained when the powder resin paint is sprayed on the surface of the cement lining layer at room temperature (Comparative Example 1) to low temperature heating (Comparative Example 2) or at a high temperature (Comparative Examples 3 and 4). It was found that the adhesion strength of Examples 1 to 3 was considerably better than the case where the powder resin paint was sprayed below.
【００３１】なお、比較例４の密着強度が非常に悪いの
は、セメントモルタル層が予備加熱により熱劣化したた
めと考えられる。The reason why the adhesive strength of Comparative Example 4 was very poor is considered to be that the cement mortar layer was thermally degraded by preheating.
【００３２】[0032]
【発明の効果】以上説明したように、この発明は鋳鉄管
内面にできるシワや凹凸を表面研磨することなくセメン
トライニングで被覆し、その上にセメントライニング層
を設けこのセメントライニング層が熱影響を受けない温
度に加熱して樹脂粉体塗料を溶射ガンの炎中で溶融させ
つつ噴射塗装するため、樹脂粉体塗料の硬化反応がモル
タルライニング表面上でも十分に行われ、もって、セメ
ントライニング層の下地処理と樹脂粉体塗装による遮蔽
効果によって耐水性の良い信頼度の高い防食層を設ける
ことができるのである。As described above, according to the present invention, wrinkles and irregularities formed on the inner surface of a cast iron pipe are covered with a cement lining without polishing the surface, and a cement lining layer is provided thereon, and this cement lining layer has a thermal effect. The resin powder coating is heated to a temperature not affected by this and spray-coated while melting the resin powder coating in the flame of the thermal spray gun, so the curing reaction of the resin powder coating is sufficiently performed even on the mortar lining surface, and thus the cement lining layer A highly reliable anticorrosive layer with good water resistance can be provided by the shielding effect of the base treatment and the resin powder coating.
【００３３】なお、粉体塗料としてエポキシ樹脂粉体塗
料はセメントライニング層との接着性が高いので、より
信頼性に優れた防食層とすることができる。Since the epoxy resin powder coating has a high adhesiveness to the cement lining layer as a powder coating, it can be used as a more reliable anticorrosion layer.
【図１】実施例の一部破断側面図である。FIG. 1 is a partially cutaway side view of an embodiment.
【図２】実施例の要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part of the embodiment.
【図３】溶射ガンの説明断面図である。FIG. 3 is an explanatory sectional view of a thermal spray gun.
１…鋳鉄管 ２…セメントモルタル層 ３…移動台車 ３Ａ…アーム ４…プロパンバーナー ５…溶射ガン ６…ローラ ７…樹脂塗膜 DESCRIPTION OF SYMBOLS 1 ... Cast iron pipe 2 ... Cement mortar layer 3 ... Moving trolley 3A ... Arm 4 ... Propane burner 5 ... Thermal spray gun 6 ... Roller 7 ... Resin coating
Claims (1)
のセメントライニング層表面を、表面温度が80〜90°Ｃ
となるように熱射加熱し、その直後層表面に樹脂粉体塗
料を溶射ガンの炎中で溶融させつつ噴射塗装することを
特徴とする鋳鉄管の内面防食塗装方法。1. The method of claim 1, wherein the surface temperature of the cement lining layer of the cast iron pipe provided with the inner surface cement lining is 80 to 90 ° C.
An internal corrosion protection coating method for cast iron pipes, wherein the coating is heated by heat so that the resin powder coating is melted in the flame of a spray gun immediately after spraying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34227296A JP3492127B2 (en) | 1996-12-24 | 1996-12-24 | Internal corrosion protection coating method for cast iron pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34227296A JP3492127B2 (en) | 1996-12-24 | 1996-12-24 | Internal corrosion protection coating method for cast iron pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10185078A true JPH10185078A (en) | 1998-07-14 |
| JP3492127B2 JP3492127B2 (en) | 2004-02-03 |
Family
ID=18352444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34227296A Expired - Fee Related JP3492127B2 (en) | 1996-12-24 | 1996-12-24 | Internal corrosion protection coating method for cast iron pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3492127B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030023982A (en) * | 2001-09-14 | 2003-03-26 | 전형진 | Concrete pipe and making method thereof |
| KR100455703B1 (en) * | 2002-01-11 | 2004-11-06 | 정송옥 | Polymer Impregnated Regeneration Method for Mortar Lining of Water Works Pipe |
| JP2010201402A (en) * | 2009-03-06 | 2010-09-16 | Kurimoto Ltd | Heating method of pipe and equipment |
| KR101449454B1 (en) * | 2012-09-12 | 2014-10-13 | 주식회사 포스코 | Method and apparatus of pipe |
-
1996
- 1996-12-24 JP JP34227296A patent/JP3492127B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030023982A (en) * | 2001-09-14 | 2003-03-26 | 전형진 | Concrete pipe and making method thereof |
| KR100455703B1 (en) * | 2002-01-11 | 2004-11-06 | 정송옥 | Polymer Impregnated Regeneration Method for Mortar Lining of Water Works Pipe |
| JP2010201402A (en) * | 2009-03-06 | 2010-09-16 | Kurimoto Ltd | Heating method of pipe and equipment |
| KR101449454B1 (en) * | 2012-09-12 | 2014-10-13 | 주식회사 포스코 | Method and apparatus of pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3492127B2 (en) | 2004-02-03 |
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