JPH0547276B2 - - Google Patents
Info
- Publication number
- JPH0547276B2 JPH0547276B2 JP61044058A JP4405886A JPH0547276B2 JP H0547276 B2 JPH0547276 B2 JP H0547276B2 JP 61044058 A JP61044058 A JP 61044058A JP 4405886 A JP4405886 A JP 4405886A JP H0547276 B2 JPH0547276 B2 JP H0547276B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- paint
- gas
- painting
- pipes
- 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.)
- Expired - Lifetime
Links
- 239000003973 paint Substances 0.000 claims description 30
- 238000010422 painting Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 5
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- 230000002950 deficient Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000000576 coating method Methods 0.000 description 8
- 229910001873 dinitrogen Inorganic materials 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009503 electrostatic coating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、金属管（以下、管と略称する）特に
複数本の金属管を継手または溶接等によつて連結
して得た長い管の内面を塗装する改良された方法
に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to metal pipes (hereinafter abbreviated as pipes), particularly long pipes obtained by connecting a plurality of metal pipes by joints, welding, etc. The present invention relates to an improved method of painting interior surfaces.
各種の管、特に水道管、各種パイプラインのよ
うに複数本の管を連結し、埋設又は固定された長
尺の管の内面塗装は、静電塗装等の技術では非常
に困難か、あるいは不可能であつた。そこで、本
出願人は先に、管の内部にガスを供給して管内を
施回しつゝ進行するガス流を生ぜしめ管内に供給
された塗料をこの施回ガス流により管内面に吹き
つけて塗膜を形成する塗装法を提案した（特公昭
58−14826号公報参照）。
Coating the inner surface of various types of pipes, especially water pipes and long pipes that connect multiple pipes and are buried or fixed, is extremely difficult or impossible using techniques such as electrostatic coating. It was possible. Therefore, the applicant first supplied gas to the inside of the pipe to generate a gas flow that progresses while circulating inside the pipe, and sprayed the paint supplied into the pipe onto the inner surface of the pipe by this circulating gas flow. proposed a coating method to form a coating film (Tokuko Sho
(See Publication No. 58-14826).
然しながら前記先行技術によつても、継手や溶
接による管の接合部とか曲管部の一部にピンホー
ル状の塗膜未形成部が見られ、管の腐蝕の原因と
なることがわかつた。これは、このような部分に
は段差や屈曲により蔭となる部分が生じるためと
思われる。
However, even with the above-mentioned prior art, it has been found that pinhole-like areas where the coating film is not formed are found at joints or welded joints of pipes or in parts of curved pipe parts, which causes corrosion of the pipes. This is thought to be due to the fact that in such areas there are shaded areas due to steps and bends.
本発明の目的はこのような先行技術の欠点を除
き、塗膜未形成部のない改良された管内面塗装方
法を提供するにある。
An object of the present invention is to eliminate the drawbacks of the prior art and to provide an improved method for painting the inner surface of a pipe without forming any uncoated areas.
本発明の管内面塗装方法は、管内の一端に装入
した合成樹脂系塗料を、管内の一端から他端へ送
給するガスによつて、上記一端から他端へ移動さ
せて管内面を塗装した後、過剰の塗料を上記管内
の他端から排出し、塗装された塗料の硬化前に管
内の他端から一端へガスを送給して上記塗装され
た塗料の表層部分を上記塗装の場合と逆方向に移
動することにより欠陥部のない塗装を完成させる
ことを特徴とする。
The pipe inner surface painting method of the present invention involves painting the inner surface of the pipe by moving the synthetic resin paint charged into one end of the pipe from the one end to the other end using gas supplied from one end of the pipe to the other end. After that, excess paint is discharged from the other end of the pipe, and before the painted paint hardens, gas is supplied from the other end of the pipe to one end to cover the surface layer of the painted paint. By moving in the opposite direction, the coating is completed without any defects.
本発明では、先行技術と異なり、予め塗料を管
内に装入しておくので、流れ出してしまわないよ
うな粘度の高い合成樹脂系塗料が用いられる。管
内の一端に載置するような状態で装入された合成
樹脂系塗料は、管内の一端から他端へ向けて送給
されるガス、例えば空気や乾燥窒素ガスによつて
他端へ向けて移動させられながら管内面の塗装を
行う。この際のガス圧力はそれほど高いものを必
要とせず、0.2〜0.7Kg／cm2（ゲージ圧）程度で十
分であり、ガス流量は1/2インチ径管で１〜100
／sec程度である。 In the present invention, unlike the prior art, the paint is charged into the tube in advance, so a synthetic resin paint with a high viscosity that will not flow out is used. Synthetic resin paint placed on one end of a pipe is transported from one end of the pipe to the other by a gas such as air or dry nitrogen gas. The inner surface of the tube is painted while being moved. The gas pressure at this time does not need to be very high; around 0.2 to 0.7 Kg/cm 2 (gauge pressure) is sufficient, and the gas flow rate is 1 to 100 kg/cm 2 (gauge pressure) for a 1/2 inch diameter pipe.
/sec.
塗装を終了した過剰の塗料は、管の他端からガ
スによつて排出される。次いで、塗装された塗料
が硬化する前、即ち塗装された塗料が未だ流動性
を有している間に、管内の他端から一端へ向けて
ガス（前段のガスと同種、同圧、同量のガスでよ
い）を供給し、そのガス圧によつて塗装された塗
料の表層部分を、前段の移動と逆方向に移動させ
て塗膜未形成部を覆うようにし、欠陥部のない塗
膜を完成させるのである。 Excess paint is removed by gas from the other end of the tube. Next, before the painted paint hardens, that is, while the painted paint still has fluidity, gas (same type, same pressure, same amount as the gas in the previous stage) is injected from the other end of the pipe to one end. The surface layer of the paint is moved by the gas pressure in the opposite direction to the movement of the previous stage to cover the areas where the paint film is not formed, and the paint film is free from defects. is completed.
このように本発明の方法では、先行技術がガス
圧により一方向に塗料を移動させたのに対し、二
方向へ往復移動させることによつて目的を達成す
ることができたのである。 Thus, in the method of the present invention, the objective was achieved by moving the paint back and forth in two directions, whereas the prior art moved the paint in one direction using gas pressure.
また、先行技術によりは低圧、小量のガスでよ
いし、施回流である必要もないので、ガス供給設
備、管内への吹込設備を簡略にすることができ
る。 Further, according to the prior art, a low pressure and a small amount of gas may be used, and there is no need for a circulating flow, so the gas supply equipment and the equipment for blowing into the pipe can be simplified.
実施例 １
呼径２インチ（外径60.5mm、肉厚3.8mm）、長さ
200ｍの鋼管の内面塗装を行つた。Example 1 Nominal diameter 2 inches (outer diameter 60.5 mm, wall thickness 3.8 mm), length
Painted the inside of a 200m steel pipe.
管内の一端にエポキシ樹脂塗料100Kgを載置し、
圧力0.5Kg／cm2・Ｇの乾燥窒素ガス10m3／minを
管内の一端から送入することにより、載置した塗
料を一端から他端へ向けて移動させ、塗装残りの
塗料は他端から排出させた。次いで、塗装された
塗料表層が硬化する以前の流動性を有する間に
（実際には残りの塗料を他端から排出させた直後
であつて差支えない）前記と同種、同圧、同流量
のガスを管内の他端から一端に向けて送入し、未
硬化の塗料表層部を塗装時とは逆方向の他端から
一端方向へ小移動させて塗装を完了した。これに
より0.5mm厚のエポキシ樹脂塗膜が管内全面に形
成され、検査の結果未塗装個所（ピンホール）は
殆どみられず、塗膜圧のバラツキも従来工法に比
して格段に改良されていることが分かつた。 Place 100 kg of epoxy resin paint on one end of the pipe,
By feeding 10 m 3 /min of dry nitrogen gas at a pressure of 0.5 Kg/cm 2 G from one end of the pipe, the applied paint is moved from one end to the other, and the unpainted paint is removed from the other end. It was discharged. Next, while the surface layer of the applied paint has fluidity before curing (actually, it may be immediately after the remaining paint is discharged from the other end), a gas of the same type, pressure, and flow rate as above is applied. was fed into the tube from the other end toward one end, and the uncured paint surface layer was slightly moved from the other end toward the one end in the opposite direction to that during painting, thereby completing the coating. As a result, a 0.5 mm thick epoxy resin coating was formed on the entire inside of the pipe, and inspection revealed that there were almost no unpainted areas (pinholes), and the variation in coating film pressure was significantly improved compared to the conventional method. I found out that there was.
本発明は、前記のように塗料を二方向に往復移
動させるので、長尺管、固定管内の一方向からで
は蔭となる部分にもピンホール状の塗膜未形成部
分を生じることなく完全な塗装を行うことがで
き、管の腐蝕を防止することができる。
As described above, the present invention reciprocates the paint in two directions, so that even parts of long pipes and fixed pipes that are shaded from one direction are completely covered without creating pinhole-like parts where no paint film is formed. Painting can be applied to prevent pipe corrosion.
塗料を移動させるためのガスとしては、特に制
限はなく、圧縮空気でもよいが、例えばビル内配
管（上水用ま廃水用）の場合には、空気圧縮機に
よる圧縮空気を使用するとその機械音が大きくて
騒音公害を起こすことになる。これを防止するに
は窒素ガスを使用するのが好ましい。所望圧の窒
素ガスは液体窒素の気化または窒素ガスボンベか
らの供給によつて容易に得られる。窒素ガスを使
用すると、空気に比して温度が上げ易いので、塗
料の乾燥に便利という利点があるし、液体窒素の
気化ガスの場合は全く水分を含まない乾燥ガスで
あるから一層有利である。また、先行技術にも開
示されている窒素ガスで附勢された研磨材による
管内研掃工法と組合わせ使用すれば、一層本発明
の利点が顕著となる。 There are no particular restrictions on the gas used to move the paint, and compressed air may be used, but for example, in the case of building piping (water supply or waste water), if compressed air is used from an air compressor, the mechanical noise will be reduced. is large and causes noise pollution. To prevent this, it is preferable to use nitrogen gas. Nitrogen gas at the desired pressure can be easily obtained by vaporizing liquid nitrogen or supplying it from a nitrogen gas cylinder. Using nitrogen gas has the advantage of being convenient for drying paint because it can raise the temperature more easily than air, and using vaporized liquid nitrogen gas is even more advantageous because it is a drying gas that does not contain any moisture. . Furthermore, the advantages of the present invention will be even more pronounced if used in combination with the pipe cleaning method using an abrasive material energized with nitrogen gas, which is also disclosed in the prior art.
Claims (1)
内の一端から他端へ送給するガスによつて、上記
一端から他端へ移動させて管内面を塗装した後、
過剰の塗料を上記管内の他端から排出し、塗装さ
れた塗料の硬化前に管内の他端から一端へガスを
送給して上記塗装された塗料の表層部分を上記塗
装の場合と逆方向に移動することにより欠陥部の
ない塗装を完成させることを特徴とする管内面塗
装方法。1. After painting the inner surface of the pipe by moving the synthetic resin paint charged into one end of the pipe from the one end to the other end using gas supplied from one end of the pipe to the other end,
Excess paint is discharged from the other end of the pipe, and before the painted paint hardens, gas is supplied from the other end of the pipe to one end to coat the surface layer of the painted paint in the opposite direction to the above painting. A method for painting the inner surface of a pipe, which is characterized by completing painting without defective parts by moving the surface to the surface of the pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4405886A JPS62201677A (en) | 1986-03-03 | 1986-03-03 | Method for coating inside surface of pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4405886A JPS62201677A (en) | 1986-03-03 | 1986-03-03 | Method for coating inside surface of pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62201677A JPS62201677A (en) | 1987-09-05 |
| JPH0547276B2 true JPH0547276B2 (en) | 1993-07-16 |
Family
ID=12681014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4405886A Granted JPS62201677A (en) | 1986-03-03 | 1986-03-03 | Method for coating inside surface of pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62201677A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63194780A (en) * | 1987-02-06 | 1988-08-11 | Epozoole:Kk | Method for coating inner wall surface of pipe or the like |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58102893A (en) * | 1981-12-15 | 1983-06-18 | 株式会社ハツコ− | Method of repairing pipe |
-
1986
- 1986-03-03 JP JP4405886A patent/JPS62201677A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58102893A (en) * | 1981-12-15 | 1983-06-18 | 株式会社ハツコ− | Method of repairing pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62201677A (en) | 1987-09-05 |
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