JPH09276794A - Method of lining inside surface of ductile pipe - Google Patents
Method of lining inside surface of ductile pipeInfo
- Publication number
- JPH09276794A JPH09276794A JP11961696A JP11961696A JPH09276794A JP H09276794 A JPH09276794 A JP H09276794A JP 11961696 A JP11961696 A JP 11961696A JP 11961696 A JP11961696 A JP 11961696A JP H09276794 A JPH09276794 A JP H09276794A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- lining
- layer
- mortar
- inside surface
- 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
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ダクタイル管の内面
ライニング方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for lining an inner surface of a ductile pipe.
【０００２】[0002]
【従来の技術】従来、大口径ダクタイル管内面を粉体塗
料でライニング塗装する場合、塗膜ピンホールの発生を
防ぐためダクタイル管内面を研磨した後、管を粉体塗料
の溶融温度まで加熱しつつ回転させ、粉体塗料をダクタ
イル管内面に供給して粉体塗料を溶融させつつ遠心力に
よって塗膜を均一に分布させて塗装を行う方法が採られ
ていた。2. Description of the Related Art Conventionally, when lining the inner surface of a large-diameter ductile pipe with a powder coating, the inner surface of the ductile pipe is polished to prevent the occurrence of paint film pinholes, and then the pipe is heated to the melting temperature of the powder coating. While rotating, the powder coating is supplied to the inner surface of the ductile pipe to melt the powder coating, and the coating is uniformly distributed by centrifugal force to perform coating.
【０００３】[0003]
【従来技術の問題点】ところで、ダクタイル管内面には
鋳物特有の「しわ」があり、ライニング層のピンホール
を防ぐためには既述のようにダクタイル管内面を十分平
滑となるように研磨する必要がある。しかし、大口径管
となるほど内面研磨には多大な時間と労力を要し、量産
には到底向かなくなる欠点があった。[Problems of the prior art] By the way, the inner surface of the ductile pipe has "wrinkles" peculiar to casting, and in order to prevent pinholes in the lining layer, it is necessary to polish the inner surface of the ductile pipe to be sufficiently smooth as described above. There is. However, the larger the diameter of the pipe, the more time and labor it takes to polish the inner surface, which is disadvantageous for mass production.
【０００４】一方、ダクタイル管内面にモルタルライニ
ングを施した場合は、上記「しわ」がモルタルライニン
グ層で覆い隠されるので、内面研磨は省略できる。しか
し、例えば水質衛生面に優れたエポキシ樹脂粉体塗料を
モルタルライニング層上に塗装する場合、粉体塗料の溶
融温度である200 ℃前後までモルタルライニング管を加
熱する必要があり、この時の熱によりモルタルライニン
グ層が影響を受けて強度低下、クラック等が発生し、折
角のライニング層を設けた意味がなくなってしまう欠点
があった。On the other hand, when the inner surface of the ductile pipe is mortar-lined, the above-mentioned "wrinkles" are covered with the mortar lining layer, so that the inner surface polishing can be omitted. However, for example, when coating epoxy resin powder coating with excellent water hygiene on the mortar lining layer, it is necessary to heat the mortar lining pipe up to around 200 ° C, which is the melting temperature of the powder coating. As a result, the mortar lining layer is affected, resulting in a decrease in strength, cracks and the like, and there is a disadvantage that the meaning of providing a lining layer with a sharp corner is lost.
【０００５】[0005]
【発明が解決しようとする課題】この発明は、上記問題
点に鑑み、粉体塗料でライニングを施す場合、管内面の
研磨処理を省略でき、しかもモルタルライニングの強度
低下やクラックの発生もなく、水質衛生面に優れた粉体
塗料で内面ライニングを行うことを目的としてなされた
ものてある。SUMMARY OF THE INVENTION In view of the above problems, the present invention is capable of omitting the polishing treatment of the inner surface of a pipe when lining with a powder coating, and further, without lowering the strength of the mortar lining or generating cracks, It was made for the purpose of lining the inner surface with a powder coating excellent in water hygiene.
【０００６】[0006]
【課題を解決するための手段】請求項１に記載の粉体塗
料は、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
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た後、再度管を回転させて管内
面に粉体塗料を供給して遠心力によって均一な層とし、
次いで管内部に赤外線ヒータを挿入して粉体塗料層のみ
を加熱して溶融硬化又は熱により硬化させることを特徴
とするものである。According to the powder coating composition of claim 1, after the inner surface of the cast iron pipe is ground, the mortar is supplied to the inner surface while rotating the pipe and a uniform layer is formed by centrifugal force. After that, after polishing the surface of the cement mortar layer that has hardened, the tube is rotated again to supply the powder coating to the inner surface of the tube to form a uniform layer by centrifugal force,
Next, an infrared heater is inserted into the tube to heat only the powder coating layer to melt and cure it or heat it.
【０００７】上記粉体塗料としてはエポキシ樹脂、ポリ
エチレン樹脂、ポリエステル樹脂などが適用できる。As the powder coating material, epoxy resin, polyethylene resin, polyester resin, etc. can be applied.
【０００８】[0008]
【作用】請求項１に記載のダクタイル管の内面ライニン
グ方法は、内面にモルタルライニングを施した鋳鉄管を
用いるから、鋳鉄管内面特有の「しわ」の研磨処理が全
く不要となる。また、モルタルライニング層上に供給さ
れた粉体塗料は赤外線ヒータによって層表面だけが加熱
されるので、熱がモルタルライニング層までは伝わりに
くく、従って、モルタルライニング層の熱による強度低
下、クラックの発生が防止される。In the inner surface lining method of the ductile pipe according to the first aspect of the present invention, since the cast iron pipe having the mortar lining on the inner surface is used, the polishing treatment of "wrinkles" peculiar to the inner surface of the cast iron pipe is completely unnecessary. Further, since only the layer surface of the powder coating material supplied onto the mortar lining layer is heated by the infrared heater, heat is difficult to be transferred to the mortar lining layer, and therefore the strength of the mortar lining layer is reduced by heat and cracks are generated. Is prevented.
【０００９】なお、粉体塗料としてエポキシ樹脂を用い
た場合、エポキシ樹脂は水質衛生面により優れるので得
られたダクタイル管の水質に対する信頼性が高められる
他、エポキシ樹脂はモルタルライニング層との付着性が
良いため、強靱なライニング層を形成できる。When an epoxy resin is used as the powder coating material, the epoxy resin is more excellent in terms of water hygiene, so that the reliability of the obtained ductile pipe with respect to the water quality can be improved, and the epoxy resin can be adhered to the mortar lining layer. As a result, a tough lining layer can be formed.
【００１０】[0010]
【実施例】次にこの発明の実施例を説明する。図１はこ
の発明の方法を実施する際の横断面図、図２は縦断面図
である。Next, an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view when carrying out the method of the present invention, and FIG. 2 is a vertical cross-sectional view.
【００１１】〔実施例１〕内径1,000mm 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２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２表面を研磨処理してレータンスを除去した後、再
度管を回転させて管内面にポリエチレン樹脂よりなる粉
体塗料３を供給し、遠心力によって均一な層とし、次い
で管内部に赤外線ヒータ４を挿入して粉体塗料層３のみ
を加熱して溶融させ表面塗装層３を形成した。その後管
を冷却し、ダクタイル管の内面ライニングを終了した。[Example 1] After the inner surface of a cast iron pipe 1 having an inner diameter of 1,000 mm was pretreated, cement mortar 2 was supplied to the inner surface while rotating the pipe 1 to form a uniform layer having a thickness of 10 mm by centrifugal force. After the cement mortar layer 2 which has been hardened and then hardened is polished to remove latance, the pipe is rotated again and the powder coating 3 made of polyethylene resin is supplied to the inner surface of the pipe to form a uniform layer by centrifugal force. Then, the infrared heater 4 was inserted inside the tube to heat and melt only the powder coating layer 3 to form the surface coating layer 3. Then, the tube was cooled, and the inner surface lining of the ductile tube was completed.
【００１２】〔実施例２〕実施例１におけるポリエチレ
ン樹脂よりなる粉体塗料３に代えて、ポリエステル樹脂
よりなる粉体塗料３を用いた他は実施例１と同様にして
ダクタイル管の内面ライニングを終了した。Example 2 The inner surface lining of a ductile pipe was prepared in the same manner as in Example 1 except that the powder coating material 3 made of polyethylene resin in Example 1 was used instead of the powder coating material 3 made of polyester resin. finished.
【００１３】〔実施例３〕実施例１におけるポリエチレ
ン樹脂よりなる粉体塗料３に代えて、エポキシ樹脂より
なる粉体塗料３を用いた他は実施例１と同様にしてダク
タイル管の内面ライニングを終了した。[Example 3] The inner surface of the ductile pipe was lined in the same manner as in Example 1 except that the powder coating material 3 made of polyethylene resin in Example 1 was replaced with the powder coating material 3 made of epoxy resin. finished.
【００１４】〔比較例１〕実施例１と同じ内径1,000mm
の鋳鉄管１の内面を、鋳鉄管特有の「しわ」（図１の部
分拡大図のＰ）が消えるまでグラインダーで研磨処理し
た。その後管全体を加熱し、ポリエチレン樹脂よりなる
粉体塗料３を供給して遠心力によって均一な層とし、モ
ルタル層を形成することなく管内面に直接表面塗装層を
設けることによってダクタイル管の内面ライニングを終
了した。[Comparative Example 1] Same inner diameter as in Example 1, 1,000 mm
The inner surface of the cast iron pipe 1 was polished by a grinder until the "wrinkles" peculiar to the cast iron pipe (P in the partially enlarged view of FIG. 1) disappeared. After that, the whole pipe is heated, the powder coating 3 made of polyethylene resin is supplied to form a uniform layer by centrifugal force, and the inner surface of the ductile pipe is lined by forming a surface coating layer directly on the inner surface of the pipe without forming a mortar layer. Finished.
【００１５】〔比較例２〕実施例１と同じ内径1,000mm
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２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２表面を研磨処理してレータンスを
除去した。その後、セメントモルタル層２表面をシール
コートしてダクタイル管の内面ライニングを終了した。[Comparative Example 2] Same inner diameter as in Example 1, 1,000 mm
After the inner surface of the cast iron pipe 1 is subjected to a surface treatment, the mortar 2 is supplied to the inner surface while rotating the pipe 1 and is hardened as a uniform layer having a thickness of 10 mm by centrifugal force, and then the hardened cement mortar layer 2 surface Was polished to remove latance. Then, the surface of the cement mortar layer 2 was seal-coated to complete the inner lining of the ductile pipe.
【００１６】〔比較例３〕実施例１と同じ内径1,000mm
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２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２表面を研磨処理してレータンスを
除去した。その後、管全体を加熱し、ポリエチレン樹脂
よりなる粉体塗料３を供給して遠心力によって均一な層
とすることによって、ダクタイル管の内面ライニングを
終了した。[Comparative Example 3] Same inner diameter as in Example 1 1,000 mm
After the inner surface of the cast iron pipe 1 is subjected to a surface treatment, the mortar 2 is supplied to the inner surface while rotating the pipe 1 and is hardened as a uniform layer having a thickness of 10 mm by centrifugal force, and then the hardened cement mortar layer 2 surface Was polished to remove latance. After that, the entire tube was heated, the powder coating material 3 made of polyethylene resin was supplied, and a uniform layer was formed by centrifugal force, whereby the inner surface lining of the ductile tube was completed.
【００１７】実施例１〜３及び比較例１〜３について、
ライニング層の付着強度、水質への影響及び要処理時間
を比較したところ表１の結果となった。なお、付着強度
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
ポキシ系接着剤で接着し、試験機にて引張ることによっ
て測定した。水質への影響は、各管に水道水を満たして
静置し、24時間後のｐＨの上昇量を測定することによっ
て試験した。Regarding Examples 1 to 3 and Comparative Examples 1 to 3,
When the adhesion strength of the lining layer, the influence on water quality and the required treatment time were compared, the results shown in Table 1 were obtained. The adhesive strength was measured by adhering a tensile terminal manufactured by Elcometer Co., Ltd. to the surface of the lining layer with an epoxy adhesive and pulling it with a testing machine. The influence on water quality was tested by filling each tube with tap water and allowing it to stand still, and measuring the amount of increase in pH after 24 hours.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表１より明らかなように、付着強度につい
ては比較例３はセメントライニング層が熱影響を受け、
塗膜付着強度が低かった。また水質影響については、比
較例２はアルカリ成分による若干のｐＨ上昇が認められ
た。用処理時間については、比較例１が非常に長く実用
的ではなかった。As is clear from Table 1, in Comparative Example 3, the cement lining layer was affected by heat in the adhesive strength.
The coating film adhesion strength was low. Regarding the influence of water quality, in Comparative Example 2, a slight increase in pH due to the alkaline component was observed. Regarding the processing time for use, Comparative Example 1 was very long and not practical.
【００２０】[0020]
【発明の効果】この発明は以上説明したように、鋳鉄管
内面にライニング層を施す場合、鋳鉄管内面にセメント
ライニング層を設けることによって、鋳鉄管特有の「し
わ」を隠すので、時間の掛かる鋳鉄管内面の研磨工程が
省略でき、さらにセメントライニング層表面に、粉体塗
料をその層だけに赤外線ヒータにより熱を与えて溶融硬
化させるので、セメントライニング層を傷めることなく
強靱な粉体塗装層を設けることができる。従って、非常
に信頼性の高いライニング層を容易に得ることが可能と
なる。特に、粉体塗料として、エポキシ樹脂粉体塗料を
用いた場合、表面ライニング層を水質衛生面に優れたも
のとなし得る他に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く、このためより信頼性に優
れたライニング層を容易に得ることが可能となる。As described above, according to the present invention, when a lining layer is formed on the inner surface of a cast iron pipe, the cement lining layer is provided on the inner surface of the cast iron pipe to hide "wrinkles" peculiar to the cast iron pipe, which is time-consuming. The step of polishing the inner surface of the cast iron pipe can be omitted, and the powder coating on the surface of the cement lining layer is heated and melted and cured by an infrared heater only to that layer, so it is a tough powder coating layer without damaging the cement lining layer. Can be provided. Therefore, a very reliable lining layer can be easily obtained. In particular, when an epoxy resin powder coating is used as the powder coating, the surface lining layer can be made excellent in terms of water hygiene, and the epoxy resin powder coating has high adhesiveness with the cement lining layer, Therefore, it becomes possible to easily obtain a lining layer having higher reliability.
【図１】この発明の方法を実施する際の横断面図であ
る。1 is a cross-sectional view when carrying out the method of the present invention.
【図２】この発明の方法を実施する際の縦断面図であ
る。FIG. 2 is a vertical cross-sectional view when carrying out the method of the present invention.
１…鋳鉄管 ２…セメントモルタル ３…粉体塗料 ４…赤外線ヒータ 1 ... Cast iron pipe 2 ... Cement mortar 3 ... Powder coating 4 ... Infrared heater
Claims (1)
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た後、再度管を回転さ
せて管内面に粉体塗料を供給して遠心力によって均一な
層とし、次いで管内部に赤外線ヒータを挿入して粉体塗
料層のみを加熱して溶融硬化又は熱により硬化させるこ
とを特徴とするダクタイル管の内面ライニング方法。1. An inner surface of a cast iron pipe is subjected to an undercoating treatment, and while the pipe is being rotated, cement mortar is supplied to the inner surface of the cast iron pipe to be hardened as a uniform layer by centrifugal force, and then the surface of the hardened cement mortar layer is polished. After that, the tube is rotated again to supply the powder coating to the inner surface of the tube to form a uniform layer by centrifugal force, and then an infrared heater is inserted inside the tube to heat only the powder coating layer to melt and cure it. A method for lining an inner surface of a ductile pipe, characterized by hardening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11961696A JPH09276794A (en) | 1996-04-16 | 1996-04-16 | Method of lining inside surface of ductile pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11961696A JPH09276794A (en) | 1996-04-16 | 1996-04-16 | Method of lining inside surface of ductile pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09276794A true JPH09276794A (en) | 1997-10-28 |
Family
ID=14765841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11961696A Pending JPH09276794A (en) | 1996-04-16 | 1996-04-16 | Method of lining inside surface of ductile pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09276794A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2784048A1 (en) * | 1998-10-05 | 2000-04-07 | Lafarge Aluminates | TUBE INTERIORLY COATED WITH A CEMENTING COMPOSITION AND PROCESS FOR PRODUCING THE SAME |
| WO2002004381A1 (en) * | 2000-07-12 | 2002-01-17 | Specialty Minerals (Michigan) Inc. | Infrared heating method and apparatus for curing refractories |
| JP2007125480A (en) * | 2005-11-02 | 2007-05-24 | Kurimoto Ltd | Method for lining inside surface of pipe |
| EP2740986A4 (en) * | 2011-08-05 | 2015-06-03 | Xinxing Ductile Iron Pipes Co | A composite anti-corrosion lining comprising waterborne epoxy cover layer and use thereof |
-
1996
- 1996-04-16 JP JP11961696A patent/JPH09276794A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2784048A1 (en) * | 1998-10-05 | 2000-04-07 | Lafarge Aluminates | TUBE INTERIORLY COATED WITH A CEMENTING COMPOSITION AND PROCESS FOR PRODUCING THE SAME |
| WO2000020183A1 (en) * | 1998-10-05 | 2000-04-13 | Lafarge Aluminates | Tube internally coated with a cement composition and method for making same |
| WO2002004381A1 (en) * | 2000-07-12 | 2002-01-17 | Specialty Minerals (Michigan) Inc. | Infrared heating method and apparatus for curing refractories |
| JP2007125480A (en) * | 2005-11-02 | 2007-05-24 | Kurimoto Ltd | Method for lining inside surface of pipe |
| EP2740986A4 (en) * | 2011-08-05 | 2015-06-03 | Xinxing Ductile Iron Pipes Co | A composite anti-corrosion lining comprising waterborne epoxy cover layer and use thereof |
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