JPS63296874A - Method for lining inner surface of pipe - Google Patents
Method for lining inner surface of pipeInfo
- Publication number
- JPS63296874A JPS63296874A JP13647087A JP13647087A JPS63296874A JP S63296874 A JPS63296874 A JP S63296874A JP 13647087 A JP13647087 A JP 13647087A JP 13647087 A JP13647087 A JP 13647087A JP S63296874 A JPS63296874 A JP S63296874A
- Authority
- JP
- Japan
- Prior art keywords
- mortar
- pipe
- lining
- component
- less
- 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
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 13
- 239000004576 sand Substances 0.000 claims abstract description 10
- 239000008399 tap water Substances 0.000 claims abstract description 5
- 235000020679 tap water Nutrition 0.000 claims abstract description 5
- 238000005119 centrifugation Methods 0.000 claims description 2
- 238000007796 conventional method Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 19
- 238000010828 elution Methods 0.000 abstract description 6
- 239000003513 alkali Substances 0.000 abstract description 5
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract description 3
- 238000004898 kneading Methods 0.000 abstract description 2
- 238000005498 polishing Methods 0.000 abstract description 2
- 239000000306 component Substances 0.000 abstract 3
- 239000010410 layer Substances 0.000 description 14
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 8
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000002585 base Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 101100348017 Drosophila melanogaster Nazo gene Proteins 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- -1 groundwater Chemical compound 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は管内面ライニング方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for lining the inner surface of a tube.
水道管など」二本用鋳鉄管内面には、管自体に防蝕性を
付与すること、及び発錆等による水質への影響を無くず
二つの観点より防蝕ライニングが施されるのが、普通で
ある。Corrosion-resistant lining is usually applied to the inner surface of cast iron pipes for two purposes, such as water pipes, from the two viewpoints of providing corrosion resistance to the pipe itself and eliminating the effect of rust on water quality. be.
このライニング層としては鉄素地をアルカリ不動態化し
て防蝕するモルタルライニングが好適に使用されている
。As this lining layer, a mortar lining in which the iron base is made alkali passivated to prevent corrosion is preferably used.
ところで、上記モルタルライニングからは、初期通水時
にアルカリ成分が溶出する問題が有り、この溶出通水の
P H上昇を押えるための通常」1記モルタルライニン
グ表面にさらにシールコート材を塗布される。By the way, there is a problem that alkaline components are eluted from the mortar lining during the initial water flow, and in order to suppress the increase in pH of the eluted water, a seal coat material is usually further applied to the surface of the mortar lining.
しかしながら、管内を流れる水の水質が地下水のように
遊離炭酸を多く含む場合、シールコ−1・材が化学変化
を起こして剥離することが有り、このff1ll m面
よりアルカリ分溶出が生じ、通水のP H上昇の原因と
なる。However, if the quality of the water flowing inside the pipe contains a large amount of free carbonate, such as groundwater, the Sealco-1 material may undergo chemical changes and peel off, and alkaline content may be eluted from this ff1llm surface, causing water to flow through the pipe. This causes an increase in pH.
即ち、鋳鉄管のライニングにおいてモルタルのアルカリ
性は鉄素地に必要な反面、通水初期の時点ではあるが、
通水の水質に対しては不都合となる相反性を有していた
。In other words, while the alkalinity of the mortar is necessary for the iron base in lining cast iron pipes, at the initial stage of water flow,
This had an inconvenient ambivalence regarding the quality of water flowing through it.
この発明は」上記問題点に鑑み、シールコートを施すこ
となく、しかも通水初期における水質のPH上昇も充分
に押えることの出来る管内面ライニング方法を提供する
ことを目鼠としてなされパものである。In view of the above-mentioned problems, the present invention was made with the aim of providing a method for lining the inner surface of a pipe, which does not require the application of a seal coat and can sufficiently suppress the increase in pH of water quality at the initial stage of water flow. .
即ぢ、この発明の管内面ライニング方法はR2O成分(
N、2.20 + K2O)が0.2、%以下のセメン
トとR2O成分(同上)が6%以下の砂とを水道水で混
練して成るモルタルを遠心法により”管内面に成層し、
モルタル硬化後湿潤状態で前記表面を研磨することを特
徴とするもので□ある。That is, the tube inner surface lining method of the present invention uses the R2O component (
A mortar made by kneading cement with N, 2.20 + K2O) of 0.2% or less and sand with R2O content (same as above) of 6% or less with tap water is layered on the inner surface of the pipe by a centrifugal method.
The method is characterized in that the surface is polished in a wet state after the mortar hardens.
〔作用〕
モルタルのア莞カリ性は主にC’a (’OH) ’2
で保たれるが、接触水へのアルカリの溶出分、即ちP
I−1上昇の原因となる成分は、モルタルに含まれる易
溶解性のナトリウム(Na)、カリウム(K)である。[Action] The potashity of mortar is mainly C'a ('OH) '2
However, the amount of alkali eluted into the contact water, that is, P
Components that cause an increase in I-1 are easily soluble sodium (Na) and potassium (K) contained in mortar.
また、これら原因物質は比較的軽い成分であり、従って
遠心法による管内面ライニングを行なった場合該う゛イ
ニング層の内表面に偏析しやすくなる。Furthermore, these causative substances are relatively light components, and therefore, when lining the inner surface of a pipe by centrifugation, they tend to segregate on the inner surface of the lining layer.
従って鋳鉄管内面モルタルライニングを行なう場合、上
述したNa、にの含有成分の少、ないセメント、砂を用
い、しかもライニング層の硬化後Na、Kの偏析しゃす
いライニング層の内表面を研磨すれば、アルカリ溶出成
分が殆ど除去され、シールコート層1を特に設けること
なく、通水の初期P Hの上昇は押えられることとなる
のである。 なお、本発明においてR2O成分(N a
20 + K 20 )が0゜2%以下のセメントと
する理由は、可及的にR2O成分の少ないセメントを使
用することを意味し、0.2%より多いセメントを用い
ると、通水初期のP H値を所定基準以下に達成するこ
とが出来ない。Therefore, when performing mortar lining on the inner surface of a cast iron pipe, use cement or sand that does not contain a small amount of Na, as described above, and polish the inner surface of the lining layer, which is free from segregation of Na and K, after hardening of the lining layer. Most of the alkaline eluted components are removed, and the initial PH increase during water flow can be suppressed without the need for providing the seal coat layer 1. In addition, in the present invention, the R2O component (N a
20 + K 20 ) is 0°2% or less, which means using cement with as little R2O as possible. If cement is more than 0.2%, the It is not possible to achieve a PH value below a predetermined standard.
また、R2O成分が6%以下の砂を用いるのも上記と同
様の理由であり、6%より多くな、ると、 、通水初期
のPH値を所定基準以下にすることが出来なくなる。Furthermore, the same reason as above is why sand with an R2O content of 6% or less is used, and if the R2O content is more than 6%, it becomes impossible to bring the pH value at the initial stage of water flow below a predetermined standard.
なお、本願発明において施工されるセメントモルクルラ
イニング層は、それ自身アルカリ成分の通水中への溶出
度はきわめて低いため、鋳鉄管として通常のR,O成分
のリッチなモルタルライニング層の施されたものを用い
、骸骨に本願発明の方法を施すことも出来る。Note that the cement mortar lining layer constructed in the present invention has a very low degree of elution of alkaline components into flowing water, so it cannot be used as a cast iron pipe with a mortar lining layer rich in R and O components. The method of the present invention can also be applied to a skeleton using a material.
この場合、本願発明のライニング層によりR2O成分の
溶出が防止される。In this case, the lining layer of the present invention prevents the R2O component from elution.
また、遠心法において、管のGNOを20以上とすれば
モルタルに充分な遠心力を作用させ、これによってRh
o(Na2O+KzO)の偏析を顕著化させることが出
来て都合が良い。In addition, in the centrifugal method, if the GNO of the tube is set to 20 or more, sufficient centrifugal force will be applied to the mortar, which will cause Rh
It is convenient because the segregation of o(Na2O+KzO) can be made noticeable.
セメントとじて成分分析を行ないR2O成分として下表
の含有成分を有するアルミナセメントを選出した。A component analysis was conducted for the cement, and an alumina cement having the components shown in the table below as the R2O component was selected.
なお、下表下欄は普通ポルトランドのものを示す。In addition, the bottom column of the table below shows those from ordinary Portland.
表 1
骨材川砂としても同様に下表含有成分のものをなお、比
較例としてNazOが3.61%、K、○が4.04%
の山砂を用いた。Table 1 As a comparative example, NazO is 3.61%, and K and ○ are 4.04%.
Mountain sand was used.
上記セメントと砂とを1=2の割合で配合し、セメント
スラリーを得、これを直径1.00cm長さ300cm
の鋳鉄管内面に遠心成形法によりGNO40×2分の条
件で厚さ3mmのライニング層を形成し、−次養生硬化
させ、次いでライニング層表面に散水しつつサンドヘー
パにより研磨処理を施し、0.3〜0.6mm表面層を
研削した。The above cement and sand were mixed in a ratio of 1=2 to obtain a cement slurry, which was made into 1.00 cm in diameter and 300 cm in length.
A lining layer with a thickness of 3 mm was formed on the inner surface of the cast iron pipe by the centrifugal forming method under the conditions of GNO40 x 2 minutes, followed by curing and hardening, and then a polishing treatment was performed with a Sandheper while sprinkling water on the surface of the lining layer. ~0.6 mm surface layer was ground.
しかる後、モルタルライニング層を完全に養生硬化させ
た後、管内に水道水を満水し、20’CX24時間経過
後の水中へのアルカリ分の溶出度を検査したところ、す
べてP H値は基準値である8、6以下を示した。After that, after completely curing and hardening the mortar lining layer, the pipe was filled with tap water and the degree of elution of alkaline content into the water after 20'CX24 hours was examined, and all PH values were within the standard value. 8, 6 or less.
なお、普通ポルトランドセメント及び比較例の砂とを用
いたものにあっては、PH値が9.6と基準値を超える
値を示し、シールコートなしでは使用不能であった。In addition, in the case of using ordinary Portland cement and the sand of the comparative example, the pH value was 9.6, which exceeded the standard value, and could not be used without a seal coat.
次に、この比較例により得たライニング管に表1.2に
示ずセメント、砂を用いさらにライニング層を設け、前
述と同様にしてライニング層を設けたところ、アルカリ
分の溶出は押えられ、使用に耐えることが判明した。Next, a lining layer was further provided on the lining tube obtained in this comparative example using cement and sand not shown in Table 1.2, and when a lining layer was provided in the same manner as described above, the elution of alkali components was suppressed. It was found to be usable.
この発明は以上説明したように水中に溶出しやすい成分
を含まないセメント、骨材によりライニング層を成形す
るため、初期通水時よりアルカリ溶出が基準値以下に押
えることが出来、シールコート等を施すことなく直接使
用可能となるのである。As explained above, in this invention, the lining layer is formed from cement and aggregate that do not contain components that easily elute into water, so alkali elution can be suppressed to below the standard value from the initial water flow, and seal coat etc. It can be used directly without any further preparation.
Claims (3)
%以下のセメントとR_2O成分(同上)が6%以下の
砂とを水道水で混練して成るモルタルを遠心法により管
内面に成層し、モルタル硬化後湿潤状態で前記表面を研
磨することを特徴とする管内面ライニング方法。(1) R_2O component (Na_2O+K_2O) is 0.2
% or less of cement and sand with an R_2O component (same as above) of 6% or less, mixed with tap water, a mortar is layered on the inner surface of the pipe by a centrifugal method, and after the mortar hardens, the surface is polished in a wet state. A pipe inner lining method.
グが施されて成る特許請求の範囲第1項記載の管内面ラ
イニング方法。(2) A method for lining the inner surface of a tube according to claim 1, wherein the inner surface of the tube is previously provided with mortar lining by a conventional method.
特許請求の範囲第1項又は第2項記載の管内面ライニン
グ方法。(3) The tube inner surface lining method according to claim 1 or 2, wherein the tube rotation speed by centrifugation is GNO, 20 or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13647087A JPH0738968B2 (en) | 1987-05-29 | 1987-05-29 | Inner surface lining method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13647087A JPH0738968B2 (en) | 1987-05-29 | 1987-05-29 | Inner surface lining method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63296874A true JPS63296874A (en) | 1988-12-02 |
JPH0738968B2 JPH0738968B2 (en) | 1995-05-01 |
Family
ID=15175870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13647087A Expired - Lifetime JPH0738968B2 (en) | 1987-05-29 | 1987-05-29 | Inner surface lining method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0738968B2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS643395A (en) * | 1987-06-24 | 1989-01-09 | Denki Kagaku Kogyo Kk | Mortar lining pipe |
JPS6421296A (en) * | 1987-07-13 | 1989-01-24 | Denki Kagaku Kogyo Kk | Compound mortar lined pipe |
JPH02175645A (en) * | 1988-12-27 | 1990-07-06 | Denki Kagaku Kogyo Kk | Lining material composition |
JPH02217346A (en) * | 1989-02-15 | 1990-08-30 | Denki Kagaku Kogyo Kk | Lining material and production of lined pipe using same material |
JPH02217342A (en) * | 1989-02-15 | 1990-08-30 | Denki Kagaku Kogyo Kk | Lining material and production of lined pipe using same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6682420B2 (en) * | 2016-11-18 | 2020-04-15 | 三菱日立パワーシステムズ株式会社 | Piping member, integrated gasification combined cycle generator, and piping member assembling method |
-
1987
- 1987-05-29 JP JP13647087A patent/JPH0738968B2/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS643395A (en) * | 1987-06-24 | 1989-01-09 | Denki Kagaku Kogyo Kk | Mortar lining pipe |
JPS6421296A (en) * | 1987-07-13 | 1989-01-24 | Denki Kagaku Kogyo Kk | Compound mortar lined pipe |
JPH02175645A (en) * | 1988-12-27 | 1990-07-06 | Denki Kagaku Kogyo Kk | Lining material composition |
JPH02217346A (en) * | 1989-02-15 | 1990-08-30 | Denki Kagaku Kogyo Kk | Lining material and production of lined pipe using same material |
JPH02217342A (en) * | 1989-02-15 | 1990-08-30 | Denki Kagaku Kogyo Kk | Lining material and production of lined pipe using same |
Also Published As
Publication number | Publication date |
---|---|
JPH0738968B2 (en) | 1995-05-01 |
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