JPH07214022A - Cleaning method of resin lining water supply pipe - Google Patents
Cleaning method of resin lining water supply pipeInfo
- Publication number
- JPH07214022A JPH07214022A JP6010660A JP1066094A JPH07214022A JP H07214022 A JPH07214022 A JP H07214022A JP 6010660 A JP6010660 A JP 6010660A JP 1066094 A JP1066094 A JP 1066094A JP H07214022 A JPH07214022 A JP H07214022A
- Authority
- JP
- Japan
- Prior art keywords
- supply pipe
- water supply
- water
- cleaning
- lining
- 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
- Cleaning In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は給水管等の管路更生に利
用されるものであり、樹脂ライニングを施した給水管の
洗浄方法の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for rehabilitating a pipeline such as a water supply pipe, and relates to an improvement in a method for cleaning a water supply pipe having a resin lining.
【０００２】[0002]
【従来の技術】一般に、給水管の内壁面に大量のスケー
ル等が固着すると、所謂赤水や出水不良を起こすことに
なり、様々な不都合が発生する。そのため、既設の給水
管に於いては、内壁面のスケール等の除去と内壁面の樹
脂ライニングとを組み合わせた更生処理を施し、これに
よって赤水の発生等を防止するようにしている。2. Description of the Related Art Generally, when a large amount of scale adheres to the inner wall surface of a water supply pipe, so-called red water or poor water discharge occurs, causing various inconveniences. Therefore, the existing water supply pipe is subjected to a rehabilitation process in which scales and the like on the inner wall surface are removed and resin lining on the inner wall surface is combined to prevent the generation of red water.
【０００３】ところで、前記給水管の内壁面の樹脂ライ
ニングが完了すると、所定の時間をかけてライニング塗
膜の乾燥を行い、更に、塗膜硬化の確認や塗膜厚さの調
査等が行われる。また、ライニング塗膜に異常のない場
合には、引き続き給水管内を水洗浄し、最後に、給水管
内へ一定時間滞留せしめた水の水質検査が行われる。By the way, when the resin lining on the inner wall surface of the water supply pipe is completed, the lining coating film is dried for a predetermined period of time, and further confirmation of the coating film hardening and the examination of the coating film thickness are carried out. . Further, when there is no abnormality in the lining coating film, the inside of the water supply pipe is continuously washed with water, and finally the water quality of the water retained in the water supply pipe for a certain period of time is inspected.
【０００４】例えば、東京都に於いては、ライニング塗
膜が硬化したあと管路内を水洗浄し、その後、給水管へ
水を４８時間封入し、この封入した滞留水について、
水質基準に関する省令（昭和５３年８月３１日、厚生省
令第５６号）に基づく水質検査（アミンの溶出濃度、過
マンガン酸カリの消費量、残留塩素の濃度）及びＪＷ
ＷＡＫ１１５（昭和４９年５月１４日制定の水道用ター
ルエポキシ樹脂塗料塗装方法）による溶解試験（アミン
の溶出濃度及び残留塩素の減量濃度等）を夫々行い、各
指定項目の測定値が規定値に適合しているか否かが検査
される。For example, in Tokyo, after the lining coating film hardens, the inside of the pipe is washed with water, and then water is enclosed in the water supply pipe for 48 hours.
Water quality inspection (amine elution concentration, potassium permanganate consumption, residual chlorine concentration) and JW based on the Ministerial Ordinance on Water Quality Standards (August 31, 1978, Ministry of Health and Welfare Ordinance No. 56)
Dissolution tests (amine elution concentration and residual chlorine reduction concentration, etc.) by WAK115 (water tar epoxy resin paint coating method established on May 14, 1974) were performed respectively, and the measured values of each specified item became the specified value. Compliance is checked.
【０００５】尚、樹脂ライニングを施した給水管は、前
記水質検査等によって水質の安全性が確認された後に使
用に供されることは勿論のことであり、ライニング処理
中及び水質検査中は、別途に設けた仮設配管を通して給
水が行われる。また、前記水質検査等の結果、何れか一
つの検査項目でも規定値に適合しないものがあれば、再
び給水管内壁面の水洗浄が行われ、その後、前記と同様
の方法により水質等の再検査が行われる。Incidentally, it goes without saying that the water supply pipe provided with the resin lining is used after the safety of the water quality is confirmed by the water quality inspection or the like, and during the lining treatment and the water quality inspection, Water is supplied through a separate temporary pipe. Also, as a result of the water quality inspection, etc., if any one of the inspection items does not meet the specified value, the inner wall surface of the water supply pipe is washed again, and then the water quality etc. is re-inspected by the same method as described above. Is done.
【０００６】而して、前記滞留水の水質試験に於いて、
最も厳しい条件となる指定検査項目は「残留塩素の減
量」の試験項目であり、当該「残留塩素の減量」の規定
値（０．７ｍｇ／ｌ以下）をクリアーするのは至難のこ
とである。In the water quality test of the accumulated water,
The designated inspection item that is the most severe condition is the test item of “reduction of residual chlorine”, and it is extremely difficult to meet the specified value (0.7 mg / l or less) of the “reduction of residual chlorine”.
【０００７】即ち、水道水中には消毒用の塩素が添加さ
れており、水中に存在する遊離有効塩素（ＨＯＣｌ及び
ＯＣｌ）によって水の消毒が持続的に行われている。従
って、水道水中の残留塩素濃度は、消毒作用を担保する
点から一定値以上の濃度を保持する必要があり、この観
点から、前記水質試験に於いては、「残留塩素の減量」
が０．７ｐｐｍ（０．７ｍｇ／ｌ）以下と規定されてい
る。[0007] That is, chlorine for disinfection is added to tap water, and free disinfection of chlorine (HOCl and OCl) present in water continuously disinfects water. Therefore, the residual chlorine concentration in tap water must be kept at a certain level or higher from the viewpoint of ensuring the disinfecting action. From this viewpoint, in the water quality test, "reduction of residual chlorine"
Is specified to be 0.7 ppm (0.7 mg / l) or less.
【０００８】しかし、塩素は強力な酸化剤であるため、
水中に存在するＦｅ2+，Ｍｎ2+，Ｈ 2 ｓや有機物等の酸
化され易い物質は容易に塩素と反応し、その殆どは塩化
物イオンや有機塩素化合物となる。その結果、水中の残
留塩素の濃度は著しく低下することになる。特に、管路
内壁面にライニング塗膜を形成した場合には、塗膜を形
成するエポキシ樹脂等から水中への各種の物質の溶出が
不可避であり、その結果、溶出物質が塩素によって酸化
されることにより、残留塩素の減量が一層激しくなり、
水中の残留塩素濃度が少なくなる。However, since chlorine is a strong oxidant,
Fe existing in water2+, Mn2+, H 2acid such as s and organic matter
Substances that are easily converted easily react with chlorine, and most of them are chlorinated.
It becomes a product ion or an organic chlorine compound. As a result, the underwater remains
The concentration of distillate chlorine will be significantly reduced. Especially the pipeline
If a lining coating is formed on the inner wall surface,
Elution of various substances from the epoxy resin etc. formed into water
Unavoidable, and as a result, the dissolved substances are oxidized by chlorine
As a result, the amount of residual chlorine lost becomes more severe,
Residual chlorine concentration in water decreases.
【０００９】尚、水質検査の結果、前記「残留塩素の減
量」が０．７ｍｇ／ｌを越える場合には、前述の如く、
再度管路内壁面を時間をかけて十分に洗浄し、ライニン
グ塗膜から溶出物質を可能な限り溶出させてしまう必要
がある。従って、必然的に給水管の使用が遅れることに
なり、ライニング処理コストの上昇を招くことになる。As a result of the water quality test, if the "reduction of residual chlorine" exceeds 0.7 mg / l, as described above,
It is necessary to thoroughly wash the inner wall surface of the conduit again over time to elute the eluted substance from the lining coating film as much as possible. Therefore, the use of the water supply pipe is inevitably delayed and the lining treatment cost is increased.
【００１０】[0010]
【発明が解決しようとする課題】本発明は、従前の樹脂
ライニング給水管の洗浄方法に於ける上述の如き問題、
即ち残留塩素の減量を規定値以下に押さえるために
は、長時間に亘って樹脂ライニング給水管を洗浄する必
要があり、管路の更生処理に要する時間の短縮が困難
で、処理コストの引き下げが図れないこと、繰り返し
給水管内壁面の水洗浄を行っても、残留塩素の減量が規
定値以下にならない場合があり、大きな経済的損失が発
生し易いこと、及び大量の洗浄水を使用するため、経
済性に欠けること等の問題を解決せんとするものであ
り、樹脂ライニング給水管を経済的に且つ迅速に洗浄す
ることができ、しかも給水管内の水を安全性に優れた水
質に保持し得るようにした樹脂ライニング給水管の洗浄
方法を提供するものである。SUMMARY OF THE INVENTION The present invention has the above-mentioned problems in the conventional method for cleaning a resin-lined water supply pipe,
That is, in order to suppress the reduction of residual chlorine to below the specified value, it is necessary to wash the resin-lined water supply pipe for a long time, it is difficult to shorten the time required for the rehabilitation treatment of the pipeline, and it is possible to reduce the treatment cost. Even if the inner wall surface of the water supply pipe is repeatedly washed with water, the residual chlorine reduction amount may not fall below the specified value, large economic loss is likely to occur, and a large amount of washing water is used. It is intended to solve problems such as lack of economy, and the resin-lined water supply pipe can be cleaned economically and quickly, and the water in the water supply pipe can be kept with excellent water quality. A method for cleaning a resin-lined water supply pipe is provided.
【００１１】[0011]
【課題を解決するための手段】本件発明者は、多数の給
水管の更生処理を通して、残留塩素を有する洗浄液で樹
脂ライニング給水管路を洗浄した場合に、ライニング塗
膜を形成するエポキシ樹脂等から洗浄液内へ溶出する溶
出物の量は洗浄液の残留塩素濃度によって変化し、一定
の残留塩素濃度までは、塩素濃度の増加と共に溶出物の
量が増加し、且つ一定量の溶出物が溶出されてしまう
と、その後の溶出物が急減すると云う事象を見出した。Means for Solving the Problems The inventor of the present invention has found that an epoxy resin or the like that forms a lining coating film when a resin lining water supply pipe is washed with a cleaning liquid containing residual chlorine through a large number of water supply pipe rehabilitation treatments. The amount of eluate eluted into the cleaning solution changes depending on the residual chlorine concentration in the cleaning solution.Up to a certain residual chlorine concentration, the amount of eluate increases with increasing chlorine concentration, and a certain amount of eluate is eluted. Then, we found an event that the amount of eluate after that decreased sharply.
【００１２】本件発明は、前記洗浄液の残留塩素濃度と
ライニング塗膜からの溶出物との関係についての知見に
基づいて創作されたものであり、ライニング塗膜を形成
した給水管内壁面を所定塩素濃度の洗浄液で一定時間予
備洗浄することにより、ライニング塗膜から洗浄液中へ
の各種物質の溶出を促進させ、溶出された物質を洗浄液
内の残留塩素によって酸化して給水管外へ排出すること
により、後に水道水を供給した場合に於けるライニング
塗膜から水中への溶出物質を少なくせんとするものであ
る。The present invention was created based on the knowledge about the relationship between the residual chlorine concentration of the cleaning liquid and the eluate from the lining coating film, and the inner wall surface of the water supply pipe on which the lining coating film is formed has a predetermined chlorine concentration. By pre-cleaning for a certain period of time with the cleaning liquid of, by promoting the elution of various substances from the lining coating film into the cleaning liquid, by oxidizing the eluted substances with residual chlorine in the cleaning liquid and discharging them out of the water supply pipe, This is to reduce the amount of substances eluted from the lining coating film into water when tap water is supplied later.
【００１３】即ち、本件発明は、樹脂ライニング給水管
のライニング塗膜が硬化したあと、先ず濃度が１００〜
１０００００ｍｇ／ｌの塩素又は次亜塩素酸ナトリウム
若しくは次亜塩素酸カルシウムを含む洗浄液で給水管の
内壁面を予備洗浄し、次に給水管の内壁面を清水で仕上
げ洗浄することを発明の基本構成とするものである。That is, according to the present invention, after the lining coating film of the resin lining water supply pipe is cured, first, the concentration is 100 to 100%.
The basic constitution of the invention is to pre-clean the inner wall surface of the water supply pipe with a cleaning liquid containing 100,000 mg / l chlorine or sodium hypochlorite or calcium hypochlorite, and then finish the inner wall surface of the water supply pipe with clean water. It is what
【００１４】[0014]
【作用】樹脂ライニング給水管の内壁面を所定濃度の洗
浄液で予備洗浄することにより、ライニング塗膜の外表
層部から洗浄液内への物質の溶出が促進され、外表層部
に存在する溶出可能な物質の大部分が洗浄液内へ短時間
内に溶出する。洗浄液内へ溶出された物質は洗浄液内の
残留塩素によって酸化され、塩素化合物となって給水管
外へ排出される。その結果、洗浄液の排出後に給水管内
へ通水をした場合でも、ライニング塗膜の外表層部には
溶出可能な物質が殆ど存在しないため、水道水中への溶
出物質が少なくなり、これにより、水道水中の残留塩素
の減量が少なくなる。[Function] By pre-cleaning the inner wall surface of the resin lining water supply pipe with a cleaning liquid of a predetermined concentration, the elution of the substance from the outer surface layer of the lining coating film into the cleaning liquid is promoted, and the elution existing on the outer surface layer is possible. Most of the material elutes into the wash solution within a short time. The substance eluted into the cleaning liquid is oxidized by the residual chlorine in the cleaning liquid, becomes a chlorine compound, and is discharged outside the water supply pipe. As a result, even when water is passed into the water supply pipe after the cleaning liquid is discharged, there is almost no substance that can be eluted in the outer surface layer of the lining coating film, so the amount of substance eluted into tap water is reduced, and as a result, tap water is reduced. Reduction of residual chlorine in water is reduced.
【００１５】[0015]
【実施例】以下、図面に基づいて本発明の実施例を説明
する。図１は本件発明の実施工程図の一例を示すもので
あり、図に於いて、Ａは給水管内壁面の研磨工程、Ｂは
ライニング工程、Ｃは塗膜硬化工程、Ｄは塗膜の予備水
洗工程、Ｅは洗浄液調合工程、Ｆは予備洗浄工程、Ｇは
仕上げ洗浄工程である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a process chart of the present invention, in which A is a polishing process for the inner wall surface of the water supply pipe, B is a lining process, C is a coating film curing process, and D is a preliminary washing of the coating film with water. Step, E is a cleaning liquid preparation step, F is a preliminary cleaning step, and G is a finish cleaning step.
【００１６】前記研磨工程Ａ及びライニング工程Ｂは公
知の管路更生方法の場合と同様であり、また、ライニン
グ工程Ｂでは二液混合型のエポキシ樹脂塗料が広く利用
されている。尚、本実施例ではライニング材を二液混合
型エポキシ樹脂塗料としているが、一液型エポキシ樹脂
塗料であってもよく、或いはその他の合成樹脂塗料（例
えば、ポリウレタン樹脂、ポリエステル樹脂、エポキシ
樹脂以外のポリエーテル樹脂、ポリオレフィン樹脂等）
であってもよい。The polishing step A and the lining step B are the same as those in the known method for rehabilitating a pipeline, and in the lining step B, a two-component mixed type epoxy resin paint is widely used. In this embodiment, the lining material is a two-component mixed type epoxy resin coating, but it may be a one-component type epoxy resin coating or other synthetic resin coating (for example, other than polyurethane resin, polyester resin, epoxy resin). Polyether resin, polyolefin resin, etc.)
May be
【００１７】給水管内壁面に所望の厚さのライニング塗
膜が形成されると、引き続き塗膜の乾燥硬化が行われ
る。当該塗膜硬化工程Ｃでは、給水管内へ温風又は乾燥
空気が所定時間（例えば２４時間）流通され、これによ
ってライニング塗膜が硬化される。When the lining coating film having a desired thickness is formed on the inner wall surface of the water supply pipe, the coating film is subsequently dried and cured. In the coating film curing step C, warm air or dry air is circulated in the water supply pipe for a predetermined time (for example, 24 hours), whereby the lining coating film is cured.
【００１８】ライニング塗膜が乾燥され、所定の硬度例
えばＪＷＷＡＧ１１２（昭和５５年１２月１８日制定の
水道用ダクタイル鋳鉄管内面のエポキシ樹脂粉体塗装の
鉛筆引っかき試験）に規定の塗膜硬度になると、給水管
内へ洗浄水（水道水）を供給し、管路内壁面（塗膜外表
面）を予備水洗する。尚、当該給水管内壁面の予備水洗
工程Ｄでは、内径２０ｍｍの管口径の場合、１０〜３０
℃の清水が、４０〜１００ｌ／ｍｉｎの流量で、約２０
〜１２０分間連続的に給水管内へ供給され、これによっ
てライニング塗膜の外表面が洗浄される。When the lining coating film is dried and has a predetermined hardness such as JWWAG112 (pencil scratch test of epoxy resin powder coating on the inner surface of ductile cast iron pipe for water supply established on December 18, 1980) Supplying wash water (tap water) into the water supply pipe and prewashing the inner wall surface of the pipe (outer surface of the coating film). In the preliminary washing step D of the inner wall surface of the water supply pipe, in the case of a pipe bore having an inner diameter of 20 mm, 10 to 30
C. fresh water at a flow rate of 40 to 100 l / min for about 20
It is continuously fed into the water supply pipe for 120 minutes, whereby the outer surface of the lining coating film is cleaned.
【００１９】前記予備水洗工程Ｄが完了すると、洗浄液
調合工程Ｅに於いて洗浄液が調合される。即ち、当該洗
浄液は水道水に次亜塩素酸ナトリウム（ＮａＯＣｌ）を
混合することにより調合されており、本実施例では水道
水に日本薬局方１２％次亜塩素酸ソーダ水溶液を混合
し、その濃度が１００〜１０００００ｍｇ／ｌの洗浄液
を作成する。尚、洗浄液の次亜塩素酸ナトリウムの濃度
は１０００〜２００００ｍｇ／ｌの範囲が望ましく、更
には２０００〜８０００ｍｇ／ｌの範囲が最も望まし
い。When the preliminary water washing step D is completed, the washing liquid is prepared in the washing liquid preparing step E. That is, the cleaning solution is prepared by mixing sodium hypochlorite (NaOCl) with tap water. In this example, tap water is mixed with a 12% sodium hypochlorite aqueous solution of the Japanese Pharmacopoeia, and the concentration thereof is adjusted. Creates a cleaning solution of 100-100,000 mg / l. The concentration of sodium hypochlorite in the cleaning solution is preferably in the range of 1000 to 20000 mg / l, more preferably 2000 to 8000 mg / l.
【００２０】尚、本実施例では、洗浄剤として次亜塩素
酸ナトリウム（ＮａＯＣｌ）を使用しているが、次亜塩
素酸カルシウム［Ｃａ（ＯＣｌ）2 ］や二酸化塩素（Ｃ
ｌＯ 2 ）、塩素ガス（Ｃｌ2 ）、等であってもよい。ま
た、塩素ガスＣｌ2 を添加した場合には、Ｃｌ2 ＋Ｈ2
Ｏ⇔ＨＯＣｌ＋Ｈ+＋Ｃｌ- 、ＨＯＣｌ⇔Ｈ+ ＋ＯＣｌ
- なる二つの反応が起こり、水溶液中にＨＯＣｌとＯＣ
ｌ- から成る遊離有効塩素が起生する。更に、次亜塩素
酸塩を水に添加した場合には、Ｃａ（ＯＣｌ）2 ＋２Ｈ
2 Ｏ→２ＨＯＣｌ＋Ｃａ（ＯＨ）2 、ＮａＯＣｌ＋Ｈ2
Ｏ→ＨＯＣｌ＋Ｎａ（ＯＨ）の如き反応により遊離塩素
ＨＯＣｌが水溶液中に生成される。In this embodiment, hypochlorite is used as the cleaning agent.
Sodium salt (NaOCl) is used, but hyposulfite
Calcium oleate [Ca (OCl)2] Or chlorine dioxide (C
10 2), Chlorine gas (Cl2), Etc. Well
Chlorine gas Cl2When added, Cl2+ H2
O⇔HOCl + H++ Cl-, HOCl⇔H++ OCl
-The following two reactions occur and HOCl and OC are added to the aqueous solution.
l-Free available chlorine consisting of Furthermore, hypochlorite
If acid salt is added to water, Ca (OCl)2+ 2H
2O → 2HOCl + Ca (OH)2, NaOCl + H2
Free chlorine by reaction such as O → HOCl + Na (OH)
HOCl is produced in the aqueous solution.
【００２１】前記洗浄液の調合が終ると、当該洗浄液に
よる給水管内壁面の予備洗浄を行なう。即ち、予備洗浄
工程Ｆに於いては、給水管内へ洗浄液調合工程Ｆで調合
した洗浄液が封入され、約６〜２４時間の間だ給水管内
に滞留させたあと、これを排出する。After the preparation of the cleaning liquid, the inner wall surface of the water supply pipe is preliminarily cleaned with the cleaning liquid. That is, in the preliminary cleaning process F, the cleaning liquid prepared in the cleaning liquid preparing process F is enclosed in the water supply pipe, and is retained in the water supply pipe for about 6 to 24 hours and then discharged.
【００２２】尚、本実施例では、洗浄液を単に給水管内
へ封入して一定時間滞留させるようにしているが、洗浄
液を循環流動させることも可能であり、更にピグ等を給
水管内へ挿入して、流動する洗浄液と共にこれを走行移
動させることも可能である。In this embodiment, the cleaning liquid is simply enclosed in the water supply pipe and retained for a certain period of time. However, the cleaning liquid can be circulated and flowed, and a pig or the like can be inserted into the water supply pipe. It is also possible to move this with the flowing cleaning liquid.
【００２３】予備洗浄工程Ｆが終れば、給水管内を水道
水によって仕上げ洗浄する。当該仕上げ洗浄工程Ｇで
は、前記予備水洗工程Ｄとほぼ同流量の水洗が、約２０
〜１２０分ほど行なわれる。これにより、給水管の洗浄
が完了する。After the preliminary cleaning step F, the inside of the water supply pipe is finished and cleaned with tap water. In the finish washing step G, washing with approximately the same flow rate as in the preliminary washing step D is performed for about 20 times.
~ 120 minutes. This completes the cleaning of the water supply pipe.
【００２４】下記の表１は、本実施例により給水管の内
壁面の洗浄を終えた給水管の「残留塩素の減量」の試験
結果を示すものであり、洗浄液の次亜塩素酸ナトリウム
の濃度を変化せしめて測定したものである。即ち、洗浄
液によって内壁面の予備洗浄を終えた給水管内へ水道水
を封入し、４８時間給水管内へ滞留せしめた水道水の
「残留塩素の減量」を実測したものである。Table 1 below shows the test results of "reduction of residual chlorine" of the water supply pipe after cleaning the inner wall surface of the water supply pipe according to this embodiment. The concentration of sodium hypochlorite in the cleaning liquid is shown in Table 1 below. Is measured by changing. That is, the "reduction of residual chlorine" of tap water was measured by filling tap water into the water pipe after preliminarily cleaning the inner wall surface with the cleaning liquid and retaining the tap water in the water pipe for 48 hours.
【００２５】[0025]
【表１】 [Table 1]
【００２６】また、図２は表１の測定値をグラフにした
ものであり、図２からも明らかなように洗浄液の次亜塩
素酸ナトリウムの濃度が１０００〜２５０００ｍｇ／ｌ
の範囲に於いて、水道水の「残留塩素の減量」が０．７
ｍｇ／ｌ以下となっており、「残留塩素の減量」に関す
る試験の規定値をクリアーする値になっている。FIG. 2 is a graph of the measured values in Table 1. As is clear from FIG. 2, the concentration of sodium hypochlorite in the cleaning solution is 1000 to 25000 mg / l.
"Reduction of residual chlorine" in tap water is 0.7
It is below mg / l, which is a value that clears the specified value of the test regarding "reduction of residual chlorine".
【００２７】尚、滞留水の残量塩素の減量が、洗浄液の
次亜塩素酸ナトリウムの濃度と比例関係で下降するの
は、前述した如くライニング塗膜の外表層内に存在する
溶出可能な物質が、洗浄液中の塩素によって積極的に洗
浄液内へ引き出され、外表層内の溶出可能な物質そのも
のが少なくなり、その結果、水道水の滞留中に於けるラ
イニング塗膜からの物質溶出が少なくなり、これによっ
て、滞留水の残留塩素の減量が少なくなるものと想定さ
れる。Incidentally, the decrease in the residual chlorine content of the accumulated water decreases in proportion to the concentration of sodium hypochlorite in the cleaning liquid, as described above, because the substance that can be eluted in the outer surface layer of the lining coating film is dissolved. However, chlorine in the cleaning liquid is positively drawn into the cleaning liquid, and the substance itself that can be eluted in the outer surface layer is reduced.As a result, the substance is less eluted from the lining coating film during tap water retention. It is expected that this will reduce the reduction of residual chlorine in the accumulated water.
【００２８】また、洗浄液の次亜塩素酸ナトリウムの濃
度が一定値を越えて増加すると、滞留水の残留塩素の減
量が増加するのは、洗浄液内の塩素によってライニング
塗膜の外表層より内方に存在する溶出可能な物質が外表
層内まで引き出され、外表層内の溶出可能な物質が減少
しないことになり、その結果、ライニング塗膜外表層内
に残留する溶出可能な物質が滞留水内へ大量に溶出し、
これによって残留塩素の減量が多くなるものと想定され
る。Further, when the concentration of sodium hypochlorite in the cleaning liquid increases beyond a certain value, the amount of residual chlorine in the retained water is reduced because the chlorine in the cleaning liquid increases inward from the outer surface layer of the lining coating film. The leachable substances existing in the outer surface layer are extracted, and the leachable substances in the outer surface layer do not decrease.As a result, the leachable substances remaining in the outer surface layer of the lining coating film are retained in the accumulated water. A large amount of
It is expected that this will increase the amount of residual chlorine reduction.
【００２９】尚、表１は次亜塩素酸ナトリウムを含む洗
浄液についての試験結果を表わすものであるが、洗浄剤
が塩素ガスや次亜塩素酸カルシウム、二酸化塩素にかわ
っても、残留塩素の減量値は表１の場合とほぼ同等にな
ることが確認されている。Table 1 shows the test results of the cleaning liquid containing sodium hypochlorite. Even if the cleaning agent is changed to chlorine gas, calcium hypochlorite, or chlorine dioxide, the amount of residual chlorine is reduced. It has been confirmed that the values are almost the same as in Table 1.
【００３０】[0030]
【発明の効果】本発明に於いては、樹脂ライニングを施
した給水管の内壁面を、そのライニング塗膜が硬化した
あと、一定範囲内の次亜塩素酸ナトリウム等の濃度を有
する洗浄液で予備洗浄し、その後給水管内を清水で短時
間水洗する構成としている。その結果、ライニング塗膜
の外表層内に存在する溶出可能な物質が洗浄液内へ強制
的に溶出されることになり、且つ溶出された物質は洗浄
液内の塩素によって酸化され、洗浄液と共に給水管外へ
排出されることになる。また、ライニング塗膜の外表層
内には、水中へ溶出可能な物質が殆んど存在しなくな
り、従って後に水道水を滞留せしめた場合にも、ライニ
ング塗膜からの溶出物質が極めて少ないため、滞留水の
残留塩素の減少が大幅に低下することになり、給水の安
全性が容易に確保されることになる。According to the present invention, the inner wall surface of the water supply pipe provided with the resin lining is preliminarily cleaned with a cleaning liquid having a concentration of sodium hypochlorite within a certain range after the lining coating film is cured. After cleaning, the inside of the water supply pipe is rinsed with fresh water for a short time. As a result, the substance that can be eluted in the outer surface layer of the lining coating film is forcibly eluted into the cleaning liquid, and the eluted substance is oxidized by chlorine in the cleaning liquid, and is removed from the water supply pipe together with the cleaning liquid. Will be discharged to. Further, in the outer surface layer of the lining coating film, almost no substances that can be eluted into water are present, and therefore, even when tap water is retained later, the amount of substances eluted from the lining coating film is extremely small, The reduction of residual chlorine in the accumulated water will be greatly reduced, and the safety of the water supply will be easily ensured.
【００３１】更に、従前の給水管の洗浄方法によれば、
一般にライニング塗膜の乾燥硬化後の養生に約４８時
間、水道水による流水洗浄養生に約１２０時間（合計１
６８時間）を必要とし、それでも、４８時間の滞留水の
水質試験に於いて、残留塩素の減量を０．７ｍｇ／ｌ以
下に保持することは、極めて困難な状態にある。これに
対して、本願発明によれば、塗膜乾燥硬化後の養生に２
４時間、予備洗浄養生に１時間、洗浄液による予備洗浄
（封水）に約１２時間、水道水による流水洗浄養生に約
１時間（合計３８時間）を必要とするのみであり、しか
も４８時間の滞留水の水質試験に於いて、残留塩素の減
量を確実に０．７ｍｇ／ｌ以下とすることができる。Further, according to the conventional method for cleaning the water supply pipe,
Generally, about 48 hours for curing the lining coating after drying and curing, and about 120 hours for running water cleaning with tap water (total 1
68 hours), and it is still extremely difficult to maintain the residual chlorine reduction amount to 0.7 mg / l or less in the water quality test of the accumulated water for 48 hours. On the other hand, according to the invention of the present application, it is possible to perform the curing after the film is dried and cured.
4 hours, 1 hour for pre-cleaning curing, 12 hours for pre-cleaning (sealing) with cleaning solution, 1 hour for running-cleaning with tap water (38 hours in total), and 48 hours In the water quality test of the accumulated water, it is possible to reliably reduce the amount of residual chlorine to 0.7 mg / l or less.
【００３２】加えて、本発明に於いては、流水洗浄養生
に要する消費水量が大幅に減少すると共に、更生工事時
間の大幅な短縮が可能となり、給水管更生処理コストの
一層の引き下げが可能となる。本発明は上述の通り優れ
た実用的効用を奏するものである。In addition, in the present invention, the water consumption required for running water cleaning and curing can be greatly reduced, and the rehabilitation work time can be greatly shortened, so that the cost of rehabilitating the water supply pipe can be further reduced. Become. The present invention has excellent practical utility as described above.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の実施の一例を示す工程図である。FIG. 1 is a process chart showing an example of an embodiment of the present invention.
【図２】本発明の予備洗浄工程で使用する洗浄液の次亜
塩素酸ナトリウムの濃度と、１２時間洗浄液を封入して
予備洗浄をしたあと、２時間清水による仕上げ洗浄をし
た給水管内に４８時間滞留せしめた水の「残留塩素の減
量」との関係を示すグラフである。FIG. 2 shows the concentration of sodium hypochlorite in the cleaning solution used in the preliminary cleaning step of the present invention, and pre-cleaning by sealing the cleaning solution for 12 hours, and then pre-cleaning for 2 hours in fresh water for 48 hours in the water supply pipe. It is a graph which shows the relationship with the "reduction of residual chlorine" of the water which made it retain.
Ｄは予備水洗工程、Ｅは洗浄液調合工程、Ｆは予備洗浄
工程、Ｇは仕上げ洗浄工程。D is a preliminary water washing step, E is a washing liquid preparation step, F is a preliminary washing step, and G is a finishing washing step.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高田 通利 大阪府大阪市西成区玉出東２丁目９番41号 近畿配管株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutoshi Takada 2-941 Tamadehigashi, Nishinari-ku, Osaka-shi, Osaka Inside Kinki Piping Co., Ltd.
Claims (4)
が硬化したあと、先ず濃度が１００〜１０００００ｍｇ
／ｌの塩素又は次亜塩素酸ナトリウム若しくは次亜塩素
酸カルシウムを含む洗浄液で給水管の内壁面を予備洗浄
し、次に給水管の内壁面を清水で仕上げ洗浄することを
特徴とする樹脂ライニンク給水管の洗浄方法。1. After the lining coating film of the resin lining water supply pipe is cured, the concentration is first 100 to 100,000 mg.
Resin lining, characterized in that the inner wall surface of the water supply pipe is preliminarily washed with a cleaning liquid containing 1 / l of chlorine or sodium hypochlorite or calcium hypochlorite, and then the inner wall surface of the water supply pipe is finally washed with fresh water. How to clean the water supply pipe.
ると共に、洗浄液を水と次亜塩素酸ナトリウム又は次亜
塩素酸カルシウムの何れかの混合液とした請求項１に記
載の樹脂ライニング給水管の洗浄方法。2. The resin-lined water supply pipe according to claim 1, wherein the lining coating film is an epoxy resin coating film, and the cleaning liquid is a mixed liquid of water and either sodium hypochlorite or calcium hypochlorite. Cleaning method.
４時間封入するものとした請求項１又は請求項２に記載
の樹脂ライニング給水管の洗浄方法。3. Preliminary cleaning is performed by adding 6 to 2 cleaning liquid into the water supply pipe.
The method for cleaning a resin-lined water supply pipe according to claim 1 or 2, which is sealed for 4 hours.
ルシウムの濃度を２０００〜８０００ｍｇ／ｌとした請
求項１、請求項２又は請求項３に記載の樹脂ライニング
給水管の洗浄方法。4. The method for cleaning a resin-lined water supply pipe according to claim 1, 2 or 3, wherein the concentration of sodium hypochlorite or calcium hypochlorite is 2000 to 8000 mg / l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6010660A JPH07214022A (en) | 1994-02-01 | 1994-02-01 | Cleaning method of resin lining water supply pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6010660A JPH07214022A (en) | 1994-02-01 | 1994-02-01 | Cleaning method of resin lining water supply pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07214022A true JPH07214022A (en) | 1995-08-15 |
Family
ID=11756397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6010660A Pending JPH07214022A (en) | 1994-02-01 | 1994-02-01 | Cleaning method of resin lining water supply pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07214022A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101015617B1 (en) * | 2009-03-13 | 2011-02-16 | 우영선 | Manufacturing apparatus for earth bar, and earth bar using the same |
| CN102172572A (en) * | 2011-03-16 | 2011-09-07 | 中国石油化工股份有限公司 | Inner wall washing and coating corrosion resisting method for manifold pipelines in oil fields |
-
1994
- 1994-02-01 JP JP6010660A patent/JPH07214022A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101015617B1 (en) * | 2009-03-13 | 2011-02-16 | 우영선 | Manufacturing apparatus for earth bar, and earth bar using the same |
| CN102172572A (en) * | 2011-03-16 | 2011-09-07 | 中国石油化工股份有限公司 | Inner wall washing and coating corrosion resisting method for manifold pipelines in oil fields |
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