JP4430982B2 - Corrosion prevention method for pipe welds - Google Patents
Corrosion prevention method for pipe welds Download PDFInfo
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- JP4430982B2 JP4430982B2 JP2004149766A JP2004149766A JP4430982B2 JP 4430982 B2 JP4430982 B2 JP 4430982B2 JP 2004149766 A JP2004149766 A JP 2004149766A JP 2004149766 A JP2004149766 A JP 2004149766A JP 4430982 B2 JP4430982 B2 JP 4430982B2
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- Prior art keywords
- pipe
- heating
- heat
- welded portion
- tube
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- 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.)
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Links
- 238000000034 method Methods 0.000 title claims description 11
- 238000005536 corrosion prevention Methods 0.000 title 1
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000005260 corrosion Methods 0.000 claims description 4
- 229910000737 Duralumin Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 11
- 238000003466 welding Methods 0.000 description 10
- 239000012790 adhesive layer Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Description
本発明は、地下に埋設された鞘管内で溶接された配管の溶接部を熱収縮チューブで防食する方法に関する。The present invention relates to a method for preventing corrosion of a welded portion of a pipe welded in a sheath pipe buried underground with a heat shrinkable tube.
道路にガス管その他の配管を埋設する際に、建設工事費が安価である開削工法を採用するのが一般的であるが交通量の多い道路や地下埋設物の錯そうする道路の場合、工事期間の長期化による工事費の増大や、周辺住民への影響を考慮してシールド工法及び推進工法を適用することが多くなっている。When burying gas pipes and other pipes on roads, it is common to use the open-cut method with low construction costs, but in the case of high-traffic roads or roads that are likely to be underground, The shield method and the propulsion method are often applied in consideration of the increase in construction costs due to the prolonged period of time and the influence on the surrounding residents.
近年の技術の著しい進歩により、シールド工法及び推進工法等は長距離工事が一般的となっている長延長管内に配管する場合、配管の接続部は鞘管内において溶接工事及び防食工事を行うのが現状である。Due to the remarkable progress in technology in recent years, when pipes are installed in long extension pipes where long-distance construction is common for shield construction methods and propulsion construction methods, it is necessary to perform welding construction and anti-corrosion construction for the pipe connection parts in the sheath pipe. Currently.
その場合工事費の削減が至上命令であり、最大限鞘管径を小さくする方向となり無駄なスペースを作らない工事寸法となっている。このため溶接を始め防食工事も自動化してスペースをできるだけ少なくする方向に進んでいる。即ち防食工事を行う場合、熱収縮チューブを採用するに当たり、比較的広い空間が必要な直火式加熱方法を使用しない方法として遠赤外線加熱で真空方式にて現地組立による防食施工する方法を提供するものである。 Its reduced if construction costs are imperative, has a construction size not to make wasted space becomes a direction to reduce the maximum sleeve pipe diameter. For this reason, welding and other anti-corrosion work have been automated to reduce the space as much as possible. In other words, when using a heat-shrinkable tube when performing anticorrosion work, we provide a method of anticorrosion construction by field assembly in a vacuum system using far-infrared heating as a method that does not use a direct-fired heating method that requires a relatively large space. Is.
本発明は上記課題を解決したもので、配管を鞘管内で溶接し溶接部をパイプ状熱収縮チューブで防食するために、上下二分割型のジュラルミン製又はアルミニウム製の遠赤外線による円筒状真空加熱炉を車輪により鞘管内を手動で溶接部位に横移動させ、制御盤により、真空ポンプによる減圧度が６００ｍｍＨｇ以下の設定減圧度に達すると、遠赤外線による加熱が自動的に開始され、設定時間加熱後ヒーターがオフになれば加熱終了のランプが点灯するようにして、熱収縮チューブを溶接部に密着させることを特徴とする、鞘管内の配管溶接部の防食方法に関する。 The present invention solves the above-mentioned problems, and in order to weld the pipe in the sheath tube and prevent the welded portion from being corroded by the pipe-shaped heat-shrinkable tube, it is a cylindrical vacuum heating by far-infrared rays made of duralumin or aluminum that is divided into upper and lower parts. The furnace is moved laterally in the sheath tube manually by the wheel to the welding site, and when the pressure reduction degree by the vacuum pump reaches the set pressure reduction degree of 600 mmHg or less by the control panel, heating by far infrared rays is automatically started and heating for the set time The present invention relates to an anticorrosion method for a pipe welded portion in a sheath pipe , wherein a heat-shrinkable tube is brought into close contact with a welded portion so that a heating end lamp is turned on when the post-heater is turned off .
本発明に使用される熱収縮チューブとしては、例えば自動加熱用の古河電工製のラプコチューブ又は日東電工製のネオカバー＃１１５０があげられる。これらはいずれも表面に熱収縮性ポリエチレン製表層体及び裏面に接着剤層が付されている。接着剤層には離型紙が付されている。離型紙は熱収縮チューブを加熱する前にはがされるものである。熱収縮チューブは加熱されると軟化収縮し配管の溶接個所の裏面に予め設けられていた接着剤層と共にすきまなく密着して、防食層を形成するものである。Examples of the heat-shrinkable tube used in the present invention include Furukawa Electric's Rapco tube for automatic heating or Nitto Denko's Neocover # 1150. Each of these has a surface layer made of heat-shrinkable polyethylene on the front surface and an adhesive layer on the back surface. A release paper is attached to the adhesive layer. The release paper is peeled off before heating the heat shrinkable tube. The heat-shrinkable tube is softened and shrunk when heated, and closely adheres with the adhesive layer previously provided on the back surface of the welded portion of the pipe to form an anticorrosion layer.
この熱収縮チューブを加熱収縮させる場合に、加熱前の温度が２０℃より低い時は加熱する前に予め次のような基準で加熱することが好ましい。即ち温度が２０℃以上の時は４０分、５〜２０℃の時は４５分、０〜５℃の時は５０分、０℃以下の時は５５分の加熱時間とすることが好ましい。この温度管理は制御盤の温度コントロールによって制御されているもので、温度制御盤のスイッチを入れることにより自動的に真空ポンプのスイッチが入るように管理されている。一方減圧加熱炉と鞘管内の配管との間は真空パッキングにより減圧に保たれているのである。When the heat-shrinkable tube is heated and shrunk, when the temperature before heating is lower than 20 ° C., it is preferable to heat in advance according to the following criteria before heating. That is, the heating time is preferably 40 minutes when the temperature is 20 ° C. or higher, 45 minutes when the temperature is 5 to 20 ° C., 50 minutes when the temperature is 0 to 5 ° C., and 55 minutes when the temperature is 0 ° C. or lower. This temperature management is controlled by the temperature control of the control panel, and the vacuum pump is automatically switched on by switching on the temperature control panel. On the other hand, the reduced pressure heating furnace and the pipe in the sheath tube are kept at a reduced pressure by vacuum packing.
真空ポンプによる減圧度が設定減圧度に達すると遠赤外線加熱ヒーターのスイッチが自動的に入るようプログラムされている。所定時間加熱後ヒーターがオフになれば加熱終了のランプが点灯する。その後真空加熱炉をはずし、ホリデーディテクター１２，０００Ｖの検査電圧で収縮チューブ全体にピンホールがないかどうかを検査する。The far-infrared heater is programmed to automatically switch on when the vacuum pump pressure reaches the set vacuum level. When the heater is turned off after heating for a predetermined time, the heating end lamp is turned on. Thereafter, the vacuum heating furnace is removed, and the entire shrink tube is inspected for a pinhole with an inspection voltage of 12,000 V as a holiday detector.
実施例として直径７５０ｍｍφのガス管をシールド工法によって地中に埋設された鞘管直径２４００ｍｍφ内において自動溶接によって延長される場合について述べる。ガス管は定尺で作業現場で溶接される場合の溶接個所をのぞいて工場でガス管全体に防食ライニングされている。現場でガス管を溶接する場合、溶接個所を覆うことのできる熱収縮性チューブを溶接個所よりはなれてガス管に被せておき、溶接後溶接個所に熱収縮チューブを溶接個所に移動させ、上下二分割型（外寸法約８５０ｍｍφ、長さ約８２０ｍｍの円筒状加熱炉）のジュラルミン製真空加熱炉にて温度３００℃以上で約４０分間の加熱が好ましい。このようにして熱収縮チューブを溶接個所に密着させるのである。この一連の操作は制御盤に予め入力されているデータに基づいて自動的にコントロールされているのである。溶接個所の防食加工が終れば、加熱炉は開き手動で次の溶接個所に移動させられる。尚、制御盤には電源ヒーター用ケーブル、真空ホース、制御ケーブル、温度を表示する熱電対等が接続されている。As an example, a case where a gas pipe having a diameter of 750 mmφ is extended by automatic welding within a sheath pipe diameter of 2400 mmφ embedded in the ground by a shield method will be described. The gas pipe is anti-corrosion-lined throughout the gas pipe at the factory, except for the welds where the gas pipe is welded at a fixed scale. When welding a gas pipe on site, a heat-shrinkable tube that can cover the welded part is separated from the welded part and placed on the gas pipe, and after welding, the heat-shrinkable tube is moved to the welded part and Heating for about 40 minutes at a temperature of 300 ° C. or higher is preferred in a split type (cylindrical heating furnace having an outer dimension of about 850 mmφ and a length of about 820 mm) made of duralumin. In this way, the heat-shrinkable tube is brought into close contact with the weld location. This series of operations is automatically controlled based on data previously input to the control panel. When the anticorrosion processing of the welding point is completed, the heating furnace is opened and moved to the next welding point manually. The control panel is connected to a power heater cable, a vacuum hose, a control cable, a thermocouple for displaying temperature, and the like.
本発明は前記のように、鞘管の径を小さくして工事費の削減をはかるものであるが、溶接を始め防食工事等を自動化し鞘管の占めるスペースの減少化に対応しようとするものである。そして溶接後においても減圧下に熱収縮性チューブを用いて防食作業をすることにより、空気をまきこむことによるエアボイドのないすぐれた品質の防食作業が行えるという効果を有するものである。 As described above, the present invention is intended to reduce the construction cost by reducing the diameter of the sheath tube, but intends to cope with the reduction of the space occupied by the sheath tube by automating the anticorrosion work including welding. It is. And even after welding, by performing the anticorrosion work using a heat-shrinkable tube under reduced pressure, it has an effect that an excellent quality anticorrosion work can be performed without air voids by trapping air.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004149766A JP4430982B2 (en) | 2004-04-17 | 2004-04-17 | Corrosion prevention method for pipe welds |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004149766A JP4430982B2 (en) | 2004-04-17 | 2004-04-17 | Corrosion prevention method for pipe welds |
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| Publication Number | Publication Date |
|---|---|
| JP2005307329A JP2005307329A (en) | 2005-11-04 |
| JP4430982B2 true JP4430982B2 (en) | 2010-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004149766A Expired - Lifetime JP4430982B2 (en) | 2004-04-17 | 2004-04-17 | Corrosion prevention method for pipe welds |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015083811A1 (en) * | 2013-12-06 | 2015-06-11 | 古河電気工業株式会社 | Corrosion prevention method for welded section of plastic-lined steel tube and press-adhered tape for heat-shrinking corrosion-preventing sheet |
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- 2004-04-17 JP JP2004149766A patent/JP4430982B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| JP2005307329A (en) | 2005-11-04 |
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