JP2017172277A - Water storage tank - Google Patents
Water storage tank Download PDFInfo
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- JP2017172277A JP2017172277A JP2016061410A JP2016061410A JP2017172277A JP 2017172277 A JP2017172277 A JP 2017172277A JP 2016061410 A JP2016061410 A JP 2016061410A JP 2016061410 A JP2016061410 A JP 2016061410A JP 2017172277 A JP2017172277 A JP 2017172277A
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- coating layer
- storage tank
- water storage
- unsaturated polyester
- steel plate
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000003860 storage Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- 229920006337 unsaturated polyester resin Polymers 0.000 claims abstract description 19
- 238000004132 cross linking Methods 0.000 claims abstract description 8
- 229930185605 Bisphenol Natural products 0.000 claims abstract description 6
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011247 coating layer Substances 0.000 claims description 28
- 239000010410 layer Substances 0.000 claims description 11
- 239000002345 surface coating layer Substances 0.000 claims description 11
- 229920001567 vinyl ester resin Polymers 0.000 claims description 11
- 230000002265 prevention Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 abstract 1
- 229920002554 vinyl polymer Polymers 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 13
- 206010040844 Skin exfoliation Diseases 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000003365 glass fiber Substances 0.000 description 4
- 239000003673 groundwater Substances 0.000 description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011151 fibre-reinforced plastic Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000009787 hand lay-up Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
Abstract
Description
この発明は、防火用や防災用の水を蓄える地下埋設型の貯水槽に関するもので、鋼板の内外面を繊維強化プラスティックでライニングした殻を備えた貯水槽に関するものである。 The present invention relates to an underground underground water storage tank for storing water for fire prevention and disaster prevention, and relates to a water storage tank provided with a shell in which inner and outer surfaces of a steel plate are lined with fiber reinforced plastic.
従来、地下埋設型の防火水槽として、コンクリート製の貯水槽や、外面をエポキシ系又はウレタン系樹脂で塗装し、内面をエポキシ系樹脂等で塗装した鋼製の貯水槽が使われていた。 Conventionally, as underground buried type fireproof water tanks, concrete water tanks or steel water tanks whose outer surfaces are painted with epoxy or urethane resins and whose inner surfaces are painted with epoxy resins or the like have been used.
コンクリート製防火水槽は、クラックによる漏水の可能性がありかつ重量が大きいため、運搬時や据付時の工期・経済性に問題があった。一方、鋼製防火水槽は、重量的な問題はないが、被覆が塗装であって塗膜強度が不充分なため、設置時に塗膜が破損し易く、その後、塗膜欠陥部位から錆が発生し孔食となり漏水の危険性があった。 The concrete fireproof water tank has a problem in terms of construction period and economy at the time of transportation and installation because there is a possibility of water leakage due to cracks and a large weight. On the other hand, the steel fireproof water tank has no weight problem, but the coating is painted and the coating film strength is insufficient, so the coating film is easily damaged at the time of installation, and then rust is generated from the defective part of the coating film. There was a risk of water leakage due to pitting corrosion.
これらの問題点に鑑み、特許文献１において、耐久性、耐食性及び耐荷性に優れた地下水層の構造として、横型円筒形のタンクの鋼殻の内外面に強化樹脂層を設けた地下水槽が提案されている。強化樹脂層は、鋼板の内外面共にガラス繊維で強化したイソフタル酸系ポリエステル樹脂層をハンドレイアップ法やスプレーアップ法により形成している。 In view of these problems, Patent Document 1 proposes a groundwater tank in which a reinforced resin layer is provided on the inner and outer surfaces of a steel shell of a horizontal cylindrical tank as a structure of a groundwater layer excellent in durability, corrosion resistance, and load resistance. Has been. The reinforcing resin layer is formed by a hand lay-up method or a spray-up method of an isophthalic acid polyester resin layer reinforced with glass fibers on both the inner and outer surfaces of the steel plate.
強化樹脂には非常に多くの種類があり、ガラス繊維強化不飽和ポリエステル樹脂についてもＪＩＳＫ６９１９にも規定されているように多くの種類がある。従来は、耐食性が高く、硬度も高い架橋度の高い樹脂を選んで、水槽の殻を形成する鋼板の内外面を同一の強化樹脂で被覆（コーティング)していた。 There are many kinds of reinforced resins, and there are many kinds of glass fiber reinforced unsaturated polyester resins as defined in JISK6919. Conventionally, a highly cross-linked resin having high corrosion resistance and high hardness is selected, and the inner and outer surfaces of the steel plate forming the shell of the water tank are coated (coated) with the same reinforcing resin.
このように、従来は耐食性を必要とする屋外や地下埋設型の構造物の被覆層としては、架橋度の高い不飽和ポリエステル樹脂を用いている。被覆層に架橋度の低い不飽和ポリエステル樹脂を採用している例として、コンクリート建築物の屋上のライニング等で採用している例がある。これは、建築物の屋上は補修が簡単にできるため、補修を前提にして耐食性に劣る低架橋の樹脂を用いているのであり、鋼材のライニング用として用いているものでもない。 As described above, conventionally, an unsaturated polyester resin having a high degree of crosslinking is used as a coating layer for an outdoor or underground buried type structure that requires corrosion resistance. As an example in which an unsaturated polyester resin having a low degree of crosslinking is employed for the covering layer, there is an example in which it is employed in a roof lining of a concrete building. This is because the rooftop of a building can be easily repaired, and therefore, a low-crosslinking resin that is inferior in corrosion resistance is used on the premise of repair, and is not used for lining of steel materials.
一般的に架橋度が高いものは高い耐食性を示すが、伸び率が低いという難点がある。被覆層は、剥離しないように設ける必要があるが、円筒形の胴を備えた鋼製水槽用に湾曲した鋼材にＦＲＰ（繊維強化樹脂）を施工した場合、樹脂の硬化時に収縮が発生して鋼材から剥離することがある。又、水槽を露天で保管している際にも、温度収縮等で剥離が発生することがある。更に、運搬時の振動等の影響で剥離する危険性もある。 In general, those having a high degree of crosslinking exhibit high corrosion resistance, but have a drawback of low elongation. The coating layer needs to be provided so as not to peel off, but when FRP (fiber reinforced resin) is applied to a curved steel material for a steel water tank having a cylindrical body, shrinkage occurs when the resin is cured. May peel from steel. In addition, even when the water tank is stored on the open-air, peeling may occur due to temperature shrinkage or the like. Furthermore, there is a risk of peeling due to the influence of vibration during transportation.
貯水槽には水道水や井戸水を使用することもあり、ある程度の耐食性が必要である。又、貯水槽は公共工事が多く、基本的に５０年は補修等に国からの補助が受けられないため、公共工事で設置される防火用や防水用の貯水槽には、５０年を超える充分な耐久性が必要である。 Tap water and well water may be used for the water tank, and some degree of corrosion resistance is required. In addition, water tanks are often used for public works. Basically, they cannot receive subsidies from the government for repairs, etc. for 50 years. Sufficient durability is required.
この発明は、地下埋設型の貯水槽に要求される上記の問題をより好適に満たすことができる貯水槽を得ること、すなわち、製作や施工性に優れた鋼板製の殻を備えた貯水槽であって、適切な耐剥離性と耐久性とを有する被覆層を備えた地下埋設型の貯水槽を得ることを課題としている。 The present invention provides a water tank that can more suitably satisfy the above-described problems required for underground buried water tanks, that is, a water tank equipped with a steel plate shell excellent in manufacturing and workability. Thus, an object of the present invention is to obtain an underground buried type water tank provided with a coating layer having appropriate peeling resistance and durability.
この発明は、貯水槽１（１ａ、１ｂ）の鋼板製の殻２（２ａ、２ｂ、２ｃ）の内面及び外面にそれぞれに適した被覆層３及び４を設けることにより、上記課題を解決している。すなわち、この発明の貯水槽１は、水槽の殻２を形成しているガラス繊維強化不飽和ポリエステル樹脂の外面の被覆層４を備えた鋼板５の内面の被覆層３を、ビスフェノール系のビニルエステル樹脂又は外面の被覆層４より架橋度の低い若しくは注型板での伸び率の高い不飽和ポリエステル樹脂を用いた被覆層とすることにより、上記課題を解決している。
This invention solves the said subject by providing the
内面の被覆層３としては、耐食性をある程度（煮沸試験において１００時間吸水率５％以下）備えた伸び率の高い樹脂を使用したＦＲＰ被覆層とする。ビスフェノール系のビニルエステル樹脂は、硬度、耐剥離性、耐食性などにおいて不飽和ポリエステル樹脂と同等の性能を備え、かつ伸び率が高い。
As the
また、内面の被覆層３と鋼板５との接着性を向上させるために、鋼板５と内面ＦＲＰ被覆層３との間に、ビニルエステル樹脂６を施しかつ鋼板５の下地処理を一種ケレン相当の処理を施すのが好ましい。
Moreover, in order to improve the adhesiveness between the inner
この発明の貯水槽におけるＦＲＰ被覆鋼板１０の被覆層は、内面の被覆層３と外面の被覆層４とで伸び率と硬度が異なり、内面の被覆層３は耐剥離性と耐食性に優れ、外面の被覆層４は硬度と耐食性に優れているので、従来問題となっていた内面被覆層３の孔食や施工時の外面被覆層４の損傷による腐食を有効に防止することができ、より耐久性に優れた地下埋設型の鋼製の貯水槽を提供できるという効果がある。
The coating layer of the FRP coated
図１及び２は、この発明の貯水槽の例を示した図で、図１は横置き円筒形と呼ばれるもの、図２は潜函工法型又は縦円筒形と呼ばれるものの例である。円筒には、楕円断面や長円断面の円筒が含まれる。 FIGS. 1 and 2 are views showing examples of the water storage tank of the present invention. FIG. 1 is an example of what is called a horizontal cylinder, and FIG. 2 is an example of what is called a submersible method or a vertical cylinder. The cylinder includes an elliptical cross section and an oval cross section.
横置き円筒形の貯水槽１ａは、円筒形の胴部２ａとその両端を塞ぐ鏡板２ｃとで構成され、胴部２ａ及び鏡板２ｃが共にＦＲＰ被覆鋼板１０で形成されている。鏡板２ｃは、中凸の曲面板である。潜函工法型の貯水槽１ｂは、円筒形の胴部２ｂとその上下面を閉鎖する天板７及び底板（図には表れていない。）で形成され、胴部２ｂがＦＲＰ被覆鋼板１０で形成されている。天板７及び底板は平板で、外面はコンクリートで被覆されている。
A horizontal cylindrical
これらの貯水槽１には、適宜、給水口１１や取水口１２が設けられ、給水口１１から槽内に地下水や上水が供給し、取水口１２と連結する地上の配管には取水用ポンプや開閉弁などが設けられる。
These water storage tanks 1 are appropriately provided with a
この発明の貯水槽１の殻２（２ａ、２ｂ、２ｃ）におけるＦＲＰ被覆鋼板の鋼板５は、内外面を共に繊維強化樹脂の被覆層３、４で被覆されている。鋼板５の槽の外側となる外面の被覆層４は、従来の地下埋設型貯水槽で一般的に用いられている不飽和ポリエステル樹脂を用いたＦＲＰ被覆層である。具体的には、ＪＩＳＫ６９１９「繊維強化プラスチック用液状不飽和ポリエステル樹脂」で耐薬品性に優れているものとされているＵＰ−ＣＭ、ＵＰ−ＣＥ、ＵＰ−ＣＣＥに適合するもの、又はこれと同等以上のものを使用したＦＲＰ層である。外面被覆層４の厚さは、２〜５ｍｍ、最適には２〜３ｍｍである。
The
ＦＲＰ被覆鋼板１０の槽の内側を向く内面の被覆層３は、外面の被覆層４に用いた不飽和ポリエステル樹脂より架橋度の低い若しくは伸び率の大きい不飽和ポリエステル樹脂又はビスフェノール系のビニルエステル樹脂が用いられている。好ましくは、積層板での伸び率１．５％以上、注型板での伸び率２．５％以上で、ＦＲＰでの煮沸試験において１００時間吸水率５％以下の性能を有する上記樹脂を用いる。ビスフェノール系のビニルエステル樹脂の注型品の伸び率は、２％〜６％である。内面の被覆層３の形成にあたっては、鋼板５の内面に一種ケレン相当の処理を施した後、ビニルエステル樹脂を塗布して、鋼板５と内面被覆層３との間にビニルエステル樹脂層６を設けて接着性を向上させる。必要な内面被覆層３の厚さは、０．５〜１ｍｍである。
The
厚さ６ｍｍの鋼板にビニルエステル系のプライマーを塗布した後、強化繊維として２枚のガラス繊維マットを用い、樹脂として注型板の伸び率が３．１％と１６％（積層品で１．５％と２．３％）の不飽和ポリエステル樹脂を用いた厚さ２ｍｍのＦＲＰ層をスプレーアップ法で形成して２種類の試験片を作成した。これらの２種類の試験片にＦＲＰ層が凹側となる方向の曲げ試験を行った結果、鋼板に永久変形が残るほどの応力を加えてもＦＲＰ層の白化や剥離は認められず、充分な耐剥離性があることが確認できた。 After applying a vinyl ester primer to a steel plate having a thickness of 6 mm, two glass fiber mats were used as reinforcing fibers, and the elongation ratio of the cast plate as a resin was 3.1% and 16% (1. Two kinds of test pieces were prepared by forming an FRP layer having a thickness of 2 mm using 5% and 2.3% unsaturated polyester resin by a spray-up method. As a result of performing a bending test in the direction in which the FRP layer becomes the concave side on these two kinds of test pieces, whitening and peeling of the FRP layer are not recognized even when a stress is applied so that permanent deformation remains in the steel plate, and sufficient It was confirmed that there was peeling resistance.
１（１ａ、１ｂ） 貯水槽
２（２ａ、２ｂ、２ｃ） 殻
３ 被覆層
４ 被覆層
５ 鋼板
６ ビニエステル樹脂
1 (1a, 1b) Water storage tank 2 (2a, 2b, 2c)
Claims (3)
前記ＦＲＰ被覆鋼板は、不飽和ポリエステル樹脂を使用した外面の被覆層と、ビスフェノール系のビニルエステル樹脂又は外面の被覆層に使用した不飽和ポリエステル樹脂より架橋度の低い不飽和ポリエステル樹脂を使用した内面の被覆層とを備えている、貯水槽。 In an underground buried type water tank in which all or part of the shell is formed of an FRP coated steel sheet having an FRP coating layer on the inner and outer surfaces of the steel sheet,
The FRP-coated steel sheet is composed of an outer surface coating layer using an unsaturated polyester resin and an inner surface using a bisphenol vinyl ester resin or an unsaturated polyester resin having a lower degree of crosslinking than the unsaturated polyester resin used for the outer surface coating layer. A water tank provided with a coating layer.
前記ＦＲＰ被覆鋼板は、不飽和ポリエステル樹脂を使用した外面の被覆層と、ビスフェノール系のビニルエステル樹脂又は外面の被覆層に使用した不飽和ポリエステル樹脂より伸び率の高い不飽和ポリエステル樹脂を使用した内面の被覆層とを備えている、貯水槽。 In an underground buried type water tank in which all or part of the shell is formed of an FRP coated steel sheet having an FRP coating layer on the inner and outer surfaces of the steel sheet,
The FRP coated steel sheet has an outer surface coating layer using an unsaturated polyester resin, and an inner surface using an unsaturated polyester resin having a higher elongation rate than the unsaturated polyester resin used for the bisphenol-based vinyl ester resin or the outer surface coating layer. A water tank provided with a coating layer.
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| JP2016061410A JP6689009B2 (en) | 2016-03-25 | 2016-03-25 | Water storage tank |
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| JP2016061410A JP6689009B2 (en) | 2016-03-25 | 2016-03-25 | Water storage tank |
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