JPH0240106Y2 - - Google Patents
Info
- Publication number
- JPH0240106Y2 JPH0240106Y2 JP1983041287U JP4128783U JPH0240106Y2 JP H0240106 Y2 JPH0240106 Y2 JP H0240106Y2 JP 1983041287 U JP1983041287 U JP 1983041287U JP 4128783 U JP4128783 U JP 4128783U JP H0240106 Y2 JPH0240106 Y2 JP H0240106Y2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- corrosion
- pipe pile
- polyethylene resin
- piles
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 87
- 239000010959 steel Substances 0.000 claims description 87
- 239000000463 material Substances 0.000 claims description 60
- 238000000576 coating method Methods 0.000 claims description 40
- 239000011248 coating agent Substances 0.000 claims description 39
- 229920013716 polyethylene resin Polymers 0.000 claims description 38
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 8
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 8
- 239000002356 single layer Substances 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 description 55
- 230000007797 corrosion Effects 0.000 description 38
- 239000010410 layer Substances 0.000 description 17
- 239000004567 concrete Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004210 cathodic protection Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002530 phenolic antioxidant Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- IFKWVQNWZSUEIA-UHFFFAOYSA-N but-1-ene;hex-1-ene Chemical compound CCC=C.CCCCC=C IFKWVQNWZSUEIA-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、港湾、海洋や河川等の水域におい
て、各種の構造物を支持するのに用いる水中用プ
レ防食鋼管杭すなわち打込前に予め防食が施され
ている鋼管杭に関するものである。[Detailed description of the invention] [Industrial application field] This invention is a submersible pre-corrosion-proof steel pipe pile that is used to support various structures in water areas such as ports, oceans, and rivers. This relates to steel pipe piles with corrosion protection.
鋼管杭は、陸上の建築物の基礎杭をはじめ、港
湾や河川等の護岸および桟橋構造物のみならず、
海洋構造物においても大水深域や軟弱地盤に対応
できる建設用鋼材として広く使用されているが、
港湾、海洋や河川水域において用いられる鋼管杭
は、従来裸使用が一般的である。
Steel pipe piles are used not only as foundation piles for buildings on land, but also for seawalls and pier structures in ports, rivers, etc.
It is also widely used in offshore structures as a construction steel material that can be used in deep water areas and on soft ground.
Steel pipe piles used in ports, oceans, and river areas have traditionally been used bare.
港湾、海洋や河川水域において鋼管杭を裸使用
した場合、鋼管杭の腐食速度は、飛沫帯（さく望
平均満期潮面H.W.Lより上部），干満帯（さく望
平均満潮面H.W.L〜さく望平均干潮面L.W.L）近
傍において最も著しく、次に海水中（さく望平均
干潮面L.W.Lより下部）、海泥中の順に漸減する。 When steel pipe piles are used bare in ports, oceans, and rivers, the corrosion rate of the steel pipe piles is determined by the following: Splash zone (above the estimated average high tide level HWL), Tidal zone (between the estimated average high tide level HWL and the estimated average low tide level) It is most marked near the surface LWL), then gradually decreases in the seawater (below the average low tide surface LWL) and then in the sea mud.
最近の公的機関における港湾鋼構造物の腐食速
度調査による鋼管杭の平均腐食速度の一例を示す
と、飛沫帯では0.37mm／年〜0.6mm／年，干満帯
およびその近傍では0.35mm／年〜0.5mm／年であ
り、海水中の深度が大きくなるにつれて平均腐食
速度は漸減する傾向がみられ、0.05mm／年以下で
あつたと報告されている。 An example of the average corrosion rate of steel pipe piles according to recent corrosion rate surveys of port steel structures conducted by public institutions is 0.37 mm/year to 0.6 mm/year in the splash zone, and 0.35 mm/year in the tidal zone and its vicinity. It was reported that the average corrosion rate was ~0.5 mm/year, and as the depth in seawater increased, the average corrosion rate tended to gradually decrease, and was less than 0.05 mm/year.
また海泥面下では、捨石中で0.1mm／年〜0.05
mm／年，ヘドロ中で0.05mm／年，海泥中で0.01
mm／年〜０mm／年であつたと報告されている。 In addition, below the sea mud surface, 0.1 mm/year ~ 0.05 in rubble
mm/year, 0.05 mm/year in sludge, 0.01 in sea mud
mm/year to 0 mm/year.
このように、鋼管杭の平均腐食速度比率は飛沫
帯および干満帯を1.0とすると、海水中では約1/1
０、海泥中では約1/50にすぎない。 In this way, if the average corrosion rate ratio of steel pipe piles is 1.0 in the splash zone and tidal zone, it is approximately 1/1 in seawater.
0, only about 1/50 in sea mud.
一方、港湾、海洋や河川水域において用いられ
る鋼管杭についても、40〜50年間にわたる長期の
耐久性が要求されている。鋼管杭にこのような長
期の耐久性を付与するためには、鋼管杭における
最も腐食速度の速い部分である飛沫帯から干満帯
までの範囲を防食する必要がある。 On the other hand, steel pipe piles used in ports, oceans, and river areas are also required to have long-term durability of 40 to 50 years. In order to provide such long-term durability to steel pipe piles, it is necessary to protect the range from the splash zone to the tidal zone, which is the part of the steel pipe pile where the corrosion rate is the highest.
このため、最近、最も腐食速度の著しい飛沫帯
および干満帯に対する防食方法として、鋼管杭を
打設したのち、その鋼管杭における飛沫帯および
干満帯の範囲を環状底部を有する筒状カバー（型
枠）で囲み、そのカバーと鋼管杭との間にモルタ
ルを充填する防食方法等が実施されているが、こ
の防食方法の場合は、施工にあたつては、潜水夫
等の専門職を必要とし、また波浪や潮位等の海象
条件の影響を受けるためコストが高くなるという
欠点がある。 For this reason, recently, as a corrosion prevention method for the splash zone and tidal zone where the corrosion rate is the highest, after driving a steel pipe pile, the spray zone and tidal zone of the steel pipe pile are covered with a cylindrical cover (formwork) with an annular bottom. ) and filling mortar between the cover and the steel pipe pile. However, this corrosion prevention method requires professionals such as divers to perform the construction. Moreover, it has the disadvantage of being high in cost because it is affected by sea conditions such as waves and tide levels.
従来、潜水作業を必要としない鋼管杭の防食方
法として、鋼管杭にタールエポキシ塗料を塗布す
る方法、電気防食を施す方法等が知られており、
また予め鋼管杭に防食被覆を施した防食被覆鋼管
杭として、特開昭53−42403号公報により公表さ
れているように、鋼管杭の外周面にF.R.P.を塗布
して第１樹脂層を形成し、次いでその第１樹脂層
が未硬化の間に、その第１樹脂層の上にガラス繊
維を種々異なる方向に並列した状態で積層させて
ガラス繊維層を形成し、続いてそのガラス繊維層
の上に再びF.R.P.を塗布して第２樹脂層を形成
し、次に前記第１樹脂層および第２樹脂層が未硬
化の間に、第２樹脂層の外面を押圧しながら摩擦
するなどにより、各重合層内に含まれている空気
を排除すると共に、ガラス繊維層を内外両面から
挾んでいる未硬化のF.R.P.の一部をガラス繊維層
内に侵入させた防食被覆鋼管杭が知らせている。 Conventionally, known corrosion protection methods for steel pipe piles that do not require diving include methods such as applying tar epoxy paint to steel pipe piles and applying cathodic protection.
In addition, as an anti-corrosion coated steel pipe pile in which a steel pipe pile is coated with anti-corrosion coating in advance, FRP is applied to the outer peripheral surface of the steel pipe pile to form a first resin layer, as disclosed in Japanese Patent Application Laid-Open No. 53-42403. Then, while the first resin layer is uncured, glass fibers are laminated in parallel in various directions on the first resin layer to form a glass fiber layer, and then the glass fiber layer is FRP is applied again on top to form a second resin layer, and then, while the first resin layer and the second resin layer are uncured, the outer surface of the second resin layer is pressed and rubbed, etc. In addition to eliminating the air contained in each polymer layer, the corrosion-resistant coated steel pipe piles allow some of the uncured FRP that sandwiches the glass fiber layers from inside and outside to penetrate into the glass fiber layers.
さらにまた、上下の鉄筋コンクリート杭を連結
する鉄製継手座板の防食手段として、特開昭57−
123329号公報により公表されているように、内側
にブチルゴム系粘着剤からなる防食層を設けた架
橋ポリエチレン等の熱収縮チユーブを、予め上方
または下方の杭に嵌設しておき、上下の杭の鉄製
継手座板を溶接等により結合したのち、前記防食
層付きの熱収縮チユーブを、前記各継手座板の外
周面を覆う位置に移動し、次にバーナー等により
前記熱収縮チユーブを加熱収縮させて、その熱収
縮チユーブにより上下の杭の連結部の継手座板を
被覆した防食手段も知られている。 Furthermore, as a means of preventing corrosion of iron joint seat plates connecting upper and lower reinforced concrete piles, JP-A-57-
As disclosed in Publication No. 123329, a heat-shrinkable tube made of cross-linked polyethylene or the like with an anti-corrosion layer made of a butyl rubber adhesive on the inside is fitted onto the upper or lower pile in advance. After joining the iron joint seat plates by welding or the like, move the heat-shrink tube with the anti-corrosion layer to a position covering the outer peripheral surface of each joint seat plate, and then heat-shrink the heat-shrink tube with a burner or the like. Corrosion prevention means are also known in which the heat-shrinkable tube covers the joint seat plate of the connecting portion of the upper and lower piles.
〔考案が解決しようとする問題点〕
しかしながら、タールエポキシ塗料を塗布する
方法の場合は、数年以内に再塗布する必要がある
ので煩雑であり、しかも長期の防食性能が期待で
きず、かつ鋼管杭を打設する前にタールエポキシ
塗料を塗布しても、塗膜が柔かいため、ハンドリ
ング中あるいは杭打込時に、塗膜にスクラツチ傷
等の傷がつき易く、さらに杭打設後に流木等が衝
突したときも傷がつき易く、その傷部から鋼管杭
が腐食し易いという欠点がある。また鋼管杭の打
設後にタールエポキシ塗料を塗布する場合は、鋼
管杭の水中部に塗布することができず、水上部だ
けの腐食になる。鋼管杭の水中部まで塗布する場
合は排水処理が必要であるのでコストが高くな
る。[Problems that the invention aims to solve] However, the method of applying tar epoxy paint is complicated as it needs to be reapplied within several years, and long-term corrosion protection performance cannot be expected, and Even if tar epoxy paint is applied before driving the piles, the paint film is soft and is likely to be scratched or damaged during handling or driving the piles. The disadvantage is that the steel pipe piles are easily damaged when they collide, and the steel pipe piles are likely to corrode from the scratches. Furthermore, when applying tar epoxy paint after driving a steel pipe pile, it cannot be applied to the underwater part of the steel pipe pile, and only the upper part of the steel pipe pile corrodes. When applying to the underwater part of the steel pipe pile, drainage treatment is required, which increases the cost.
また電気防食を施す方法の場合は、その電気化
学的機構上、最も鋼材腐食の進行が著しい飛沫帯
や干満帯のような水面から空中に突出した部分に
おいては、防食効果が発揮しにくいという欠点が
ある。 In addition, in the case of the method of applying cathodic protection, due to its electrochemical mechanism, the corrosion protection effect is difficult to demonstrate in areas that protrude into the air above the water surface, such as in the splash zone and tidal zone, where steel corrosion progresses most rapidly. There is.
前記特開昭53−42403号公報により公表されて
いる防食被覆鋼管杭の場合は、防食被覆の構造が
複雑で塗覆工程が複雑となり、かつフアイバー材
補強等を行なうため、コスト高になるという問題
がある。 In the case of the anti-corrosion coated steel pipe pile disclosed in the above-mentioned Japanese Patent Application Laid-open No. 53-42403, the structure of the anti-corrosion coat is complicated, the coating process is complicated, and the cost is high because fiber reinforcement is required. There's a problem.
また前記特開昭57−123329号公報により公表さ
れている防食手段を鋼管杭の防食に採用すること
も考えられるが、この防食手段の場合は、熱収縮
チユーブが鋼管杭に対し固着されないので、鋼管
杭を杭打機により打撃して、防食鋼管杭を水底地
盤に打込む際の衝撃力で防食被覆がずれ動くこと
になる。 It is also possible to adopt the anti-corrosion means disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 57-123329 for corrosion protection of steel pipe piles, but in the case of this anti-corrosion means, the heat shrink tube is not fixed to the steel pipe piles, so The anti-corrosion coating will shift due to the impact force when driving the anti-corrosion steel pipe pile into the underwater ground by hitting the steel pipe pile with a pile driver.
また熱収縮チユーブの長さには制限があるの
で、長尺の鋼管杭に連続した防食被覆を設けるこ
とはできない。鋼管杭の外表面に長い範囲にわた
つて熱収縮チユーブからなる防食被覆を設ける場
合は、多数の短尺の熱収縮チユーブをその端部が
相互に重なるように配置して、順次加熱収縮させ
る必要があるが、隣り合う熱収縮チユーブの端部
は単に重合されているだけであるので、その重合
部から水が鋼管杭の外表面に浸入して防食が不完
全になる。さらに多数の短尺の熱収縮チユーブを
順次加熱収縮させて防食被覆鋼管杭を製造する作
業は煩雑でかつコスト高になる。 Furthermore, since there is a limit to the length of the heat-shrinkable tube, it is not possible to provide a continuous anti-corrosion coating on a long steel pipe pile. When providing anti-corrosion coating made of heat-shrinkable tubes over a long area on the outer surface of a steel pipe pile, it is necessary to arrange a large number of short heat-shrinkable tubes so that their ends overlap each other and heat-shrink them in sequence. However, since the ends of adjacent heat-shrinkable tubes are simply overlapped, water infiltrates the outer surface of the steel pipe pile from the overlapped portion, resulting in incomplete corrosion protection. Furthermore, the process of manufacturing a corrosion-resistant coated steel pipe pile by successively heating and shrinking a large number of short heat-shrinkable tubes is complicated and costly.
また一方、鋼管杭にエポキシ樹脂やポリウレタ
ン樹脂等の防色材を塗布して、防色被覆鋼管杭を
構成する場合、作業上１回で塗布できる塗膜の厚
さは約250μｍであるので、防食材の塗布により
厚い防食被覆を形成する場合は、塗布された防食
材が乾燥したのち再び防食材を塗布するという作
業を多数回反復して行なわねばならないので、防
食被覆鋼管杭の製造工程が煩雑でコスト高になる
という問題がある。 On the other hand, when forming a color-proof coated steel pipe pile by coating a steel pipe pile with a color-proofing material such as epoxy resin or polyurethane resin, the thickness of the coating that can be applied in one operation is approximately 250 μm. When forming a thick anti-corrosion coating by applying an anti-corrosion coating, it is necessary to repeat the process of applying the anti-corrosion coating again many times after the applied anti-corrosion has dried, so the manufacturing process of anti-corrosion coated steel pipe piles is The problem is that it is complicated and costly.
この考案は前述の問題を有利に解決した水中用
プレ防食鋼管杭を提供することを目的とするもの
であつて、この考案の要旨とするところは、水底
地盤に打込まれる鋼管杭１の外表面における少な
くとも飛沫帯から干満帯までの部分が、鋼管杭１
の外表面に塗布された接着剤を介して単層の架橋
ポリエチレンを除くポリエチレン樹脂系被覆材２
により連続して被覆され、その被覆材２の厚さが
1.5〜4.5mmに設定されていることを特徴とする水
中用プレ防食鋼管杭にある。
The purpose of this invention is to provide an underwater pre-corrosion-proof steel pipe pile that advantageously solves the above-mentioned problems. At least the part of the surface from the splash zone to the tidal zone is steel pipe pile 1
A polyethylene resin coating material 2 excluding a single layer of cross-linked polyethylene via an adhesive applied to the outer surface of the
The thickness of the coating material 2 is
It is a pre-corrosion-proof steel pipe pile for underwater use, which is characterized by having a thickness of 1.5 to 4.5 mm.
この考案において、架橋ポリエチレンを除くポ
リエチレン樹脂を使用した理由は、(1)耐透水性に
優れていること、(2)耐酸、耐アルカリ性、耐薬品
性に優れていること、(3)電気絶縁抵抗値が大きく
かつ長期間低下しないので腐食電位発生が防止で
きること、(4)熱可塑性であり後述するように工場
で容易に厚い被覆をすることができること、(5)変
性ポリエチレン等の接着剤を使用することにより
強固な接着が可能であること、(6)材料コストが安
いことなどによる。
In this idea, we used polyethylene resin other than cross-linked polyethylene because (1) it has excellent water permeability, (2) it has excellent acid, alkali, and chemical resistance, and (3) it is electrically insulating. (4) It is thermoplastic and can be easily coated with a thick coating at the factory as described later; (5) It can be used with adhesives such as modified polyethylene. This is because strong adhesion is possible when used, and (6) material cost is low.
またこの考案において前記被覆材の厚みを限定
したのは以下の理由による。 Further, the reason why the thickness of the covering material is limited in this invention is as follows.
すなわち前記ポリエチレン樹脂系被覆材２に微
小貫通疵すなわちピンホールがある場合、鋼管杭
１におけるピンホールが位置する部分に集中腐食
が発生する。しかし、実験の結果によると、ピン
ホール径とピンホールの深さ（被覆材の厚さ）と
の比が1/10以下であれば、ピンホールが腐食生成
物や気泡により閉塞され、かつ閉塞後は腐食が殆
んど進行しない。すなわち被覆材の厚さが厚くな
るほど、ピンホールの存在による鋼管杭１の集中
腐食が発生しなくなる。一般にピンホール径は
0.1mm程度であるから、ピンホールによる集中腐
食を抑制するためには前記ポリエチレン樹脂系被
覆材２の厚さを１mm以上にする必要がある。 That is, if the polyethylene resin coating material 2 has minute through-holes, that is, pinholes, concentrated corrosion occurs in the portions of the steel pipe pile 1 where the pinholes are located. However, according to the results of experiments, if the ratio of pinhole diameter to pinhole depth (covering material thickness) is 1/10 or less, pinholes become clogged with corrosion products and bubbles. After that, corrosion hardly progresses. In other words, the thicker the covering material is, the less concentrated corrosion of the steel pipe pile 1 due to the presence of pinholes occurs. Generally, the pinhole diameter is
Since the thickness is approximately 0.1 mm, the thickness of the polyethylene resin coating material 2 needs to be 1 mm or more in order to suppress concentrated corrosion due to pinholes.
また前記ポリエチレン樹脂系被覆材２の酸化劣
化を防止するためには、酸素ガスの透過速度より
その厚さを１mm以上にする必要がある。さらにプ
レ防食鋼管杭に流木が衝突した場合は、実験によ
ると、前記ポリエチレン樹脂系被覆材２に最大
0.5mmの窪みが生じる。したがつて、流木の衝突
により前記ポリエチレン樹脂系被覆材２に窪みが
生じても、ピンホールによる集中腐食を抑制し、
かつ前記ポリエチレン樹脂系被覆材２の酸化劣化
を防止するためには、１mmに0.5mmの余裕を加え
てそのポリエチレン樹脂系被覆材２の厚さを1.5
mm以上にする必要がある。 Further, in order to prevent oxidative deterioration of the polyethylene resin coating material 2, it is necessary to make its thickness 1 mm or more in view of the oxygen gas permeation rate. Furthermore, when driftwood collides with pre-corrosion-proof steel pipe piles, experiments have shown that the polyethylene resin sheathing material 2
A dent of 0.5mm is created. Therefore, even if a dent occurs in the polyethylene resin coating material 2 due to a collision with driftwood, concentrated corrosion due to pinholes is suppressed,
In addition, in order to prevent oxidative deterioration of the polyethylene resin coating material 2, the thickness of the polyethylene resin coating material 2 should be 1.5 mm by adding 0.5 mm to 1 mm.
Must be at least mm.
またこの考案においてプレ防食鋼管杭を製造す
るとき、押出機のＴダイから半溶融状態で連続し
て帯状に押出される前記ポリエチレン樹脂系被覆
材を、予め加熱しかつ接着材を塗布した鋼管杭の
外表面に対し、螺旋状にかつその被覆材の巾方向
の一部が相互に重なるように巻付ける方法がとら
れる。次いでその巻付直後に、加圧成形ロールに
より加圧成形するが、前記被覆材２の厚さが4.5
mmよりも厚くなると、巻付成形後の前記被覆材２
を迅速に冷却することができず、製造能率が悪く
なり、コストが高くなる。したがつて、前記ポリ
エチレン樹脂系被覆材２の最大厚さを4.5mmにす
る必要がある。 In addition, when manufacturing pre-corrosion-proof steel pipe piles in this invention, the polyethylene resin coating material, which is continuously extruded in a semi-molten state into strips from the T-die of an extruder, is preheated and coated with an adhesive. A method is used in which the covering material is wound spirally around the outer surface of the covering material so that a portion of the covering material in the width direction overlaps each other. Immediately after wrapping, the coating material 2 is pressure-formed using a pressure-forming roll, but the thickness of the covering material 2 is 4.5
If it becomes thicker than mm, the covering material 2 after wrapping and forming
cannot be cooled quickly, resulting in poor manufacturing efficiency and high costs. Therefore, the maximum thickness of the polyethylene resin coating material 2 needs to be 4.5 mm.
次にこの考案を図示の例によつて詳細に説明す
る。
Next, this invention will be explained in detail using illustrated examples.
第１図ないし第３図はこの考案の第１実施例を
示すものであつて、水底地盤３に打込まれる鋼管
杭１における飛沫帯４および干満帯５ならびにそ
れよりも若干下方の部分の外表面に、接着剤が塗
布され、続いて架橋ポリエチレンを除くポリエチ
レン樹脂材に紫外線劣化防止剤および酸化防止剤
を添加してなる厚さ1.5〜4.5mmのポリエチレン樹
脂系被覆材２が巻付けられて一体に固着されてい
る。 Figures 1 to 3 show the first embodiment of this invention, and show the outside of the splash zone 4, tidal zone 5, and a slightly lower part of the steel pipe pile 1 driven into the underwater ground 3. An adhesive is applied to the surface, and then a polyethylene resin covering material 2 with a thickness of 1.5 to 4.5 mm, which is made of a polyethylene resin material excluding cross-linked polyethylene and added with an ultraviolet deterioration inhibitor and an antioxidant, is wrapped around it. It is fixed in one piece.
このように構成された多数のプレ防食鋼管杭６
における下側の鋼管部分は水底地盤３、例えば海
底地盤に打込まれ、次に各プレ防食鋼管杭６の杭
頭部にわたつてコンクリート桟橋等のコンクリー
ト構造物７が築造される。すなわちコンクリート
構造物が築造されたのちは、各プレ防食鋼管杭に
おける前記被覆材２の上端面はコンクリート構造
物７の内部に配置される。 A large number of pre-corrosion-proof steel pipe piles 6 configured in this way
The lower steel pipe portion is driven into the underwater ground 3, for example, seabed ground, and then a concrete structure 7 such as a concrete pier is constructed over the pile head of each pre-corrosion-proof steel pipe pile 6. That is, after the concrete structure is constructed, the upper end surface of the covering material 2 in each pre-corrosion-proof steel pipe pile is placed inside the concrete structure 7.
このことは、従来の鋼管杭の防食法と異なり、
この考案の場合はプレ防食鋼管杭であつて、事前
に工場にて設計上必要な範囲にわたりポリエチレ
ン樹脂系被覆材が鋼管杭に被着されているので、
容易にかつ確実に鋼管杭の防食を行なうことがで
きる。特にコンクリートのアルカリ成分にも耐久
性を有するポリエチレン樹脂系被覆材によりコン
クリート構造物の内部にわたる位置まで被覆する
ことによつて、鋼管杭がコンクリート構造物内に
挿入される箇所近傍が海水のしぶき等により腐食
されるのを長期間にわたり防止することができ
る。 This differs from conventional corrosion protection methods for steel pipe piles.
In the case of this invention, it is a pre-corrosion-proof steel pipe pile, and the polyethylene resin coating material is applied to the steel pipe pile in advance at the factory to the extent necessary for the design.
Steel pipe piles can be easily and reliably protected from corrosion. By covering the inside of a concrete structure with a polyethylene resin coating material that is particularly resistant to the alkaline components of concrete, the area near where the steel pipe pile is inserted into the concrete structure can be protected from seawater spray, etc. It is possible to prevent corrosion over a long period of time.
第４図はこの考案の第２実施例を示すものであ
つて、架橋ポリエチレンを除くポリエチレン樹脂
系被覆材２が、鋼管杭１におけるコンクリート構
造物７内に位置する箇所から飛沫帯４、干満帯５
およびこれと海底地盤上の捨石層８との間の部分
に予め被着されているが、その他の構成は第１実
施例の場合と同様である。 FIG. 4 shows a second embodiment of this invention, in which a polyethylene resin sheathing material 2 excluding cross-linked polyethylene is spread from a location in a concrete structure 7 of a steel pipe pile 1 to a splash zone 4 and a tidal zone. 5
It is previously applied to the area between this and the rubble layer 8 on the seabed ground, but the other configurations are the same as in the first embodiment.
第１実施例の場合、鋼管杭１における前記ポリ
エチレン樹脂系被覆材２を被着した部分と水底地
盤３との間に電気腐食を施してもよく、あるいは
鋼管杭における前記被覆材２よりも下側の部分全
体に電気防食を施してもよい。さらにまた、前記
被覆材２を鋼管杭１の全長にわたつて被着しても
よく、あるいは前記被覆材２による被覆範囲を水
底地盤面より若干下方の箇所でとどめてもよい。
この場合は電気防食を施す必要がない。 In the case of the first embodiment, electrical corrosion may be applied between the portion of the steel pipe pile 1 covered with the polyethylene resin sheathing material 2 and the underwater ground 3, or the area below the sheathing material 2 of the steel pipe pile may be applied. The entire side portion may be provided with cathodic protection. Furthermore, the covering material 2 may be applied over the entire length of the steel pipe pile 1, or the range covered by the covering material 2 may be limited to a location slightly below the underwater ground surface.
In this case, there is no need to apply cathodic protection.
第２実施例のように、前記ポリエチレン樹脂系
被覆材２を、鋼管杭１に対し、コンクリート構造
物７内の箇所から飛沫帯４および干満帯５を含み
捨石層８または水底地盤面より若干下方の箇所ま
で連続して被着しておけば、鋼管杭１におけるコ
ンクリート構造物７の箇所から捨石層８内または
水底地盤面より若干下方の箇所までの全範囲にわ
たつて耐久防食することができ、また前記ポリエ
チレン樹脂系被覆材２は、耐アルカリ性、耐酸
性、耐薬品性が優れているので、プレ防食鋼管杭
６の周囲にアルカリ性物質や耐性物質や薬品等を
含む産業廃棄物を投棄することがあつても、その
産業廃棄物による鋼管杭の腐食を確実に防止する
ことができる。 As in the second embodiment, the polyethylene resin sheathing material 2 is applied to the steel pipe pile 1 from a location within the concrete structure 7, including the splash zone 4 and the tidal zone 5, slightly below the rubble layer 8 or the water bottom ground surface. If it is coated continuously up to the point, durable corrosion protection can be achieved over the entire range from the concrete structure 7 on the steel pipe pile 1 to the place within the rubble layer 8 or slightly below the water bottom ground surface. Furthermore, since the polyethylene resin coating material 2 has excellent alkali resistance, acid resistance, and chemical resistance, it is possible to dump industrial waste containing alkaline substances, resistant substances, chemicals, etc. around the pre-corrosion-proof steel pipe pile 6. Even if this happens, corrosion of steel pipe piles due to industrial waste can be reliably prevented.
この考案を実施する場合、前記ポリエチレン樹
脂系被覆材２として、前記ポリエチレン樹脂材に
紫外線を遮断するためのカーボンブラツクとフエ
ノール系または硫黄系化合物からなる酸化防止剤
とを添加したものを使用すれば、前記被覆材２の
耐候性、耐食性および耐スクラツチ性を一層向上
させることができる。 When implementing this invention, the polyethylene resin coating material 2 may be made of a polyethylene resin material to which carbon black for blocking ultraviolet rays and an antioxidant made of a phenolic or sulfur compound are added. , the weather resistance, corrosion resistance and scratch resistance of the coating material 2 can be further improved.
次に前記ポリエチレン樹脂系被覆材の成分の具
体例を示す。 Next, specific examples of the components of the polyethylene resin coating material will be shown.
例 １
ポリエチレン樹脂材 97.2％
カーボンブラツク 2.6％
フエノール系酸化防止材0.2％
例 ２
ポリエチレン樹脂材 96.9％
カーボンブラツク 2.8％
フエノール系酸化防止材0.3％
なお前記ポリエチレン樹脂材としては、密度
0.915〜0.970ｇ／cm3、メイトインデツクス0.05〜
0.5ｇ／10分の物性で、酢酸ビニル、ブテンヘキ
セン等との共重合体を使用するのが好ましい。Example 1 Polyethylene resin material 97.2% Carbon black 2.6% Phenolic antioxidant 0.2% Example 2 Polyethylene resin material 96.9% Carbon black 2.8% Phenolic antioxidant 0.3% The polyethylene resin material has a density
0.915~0.970g/ cm3 , mate index 0.05~
It is preferable to use a copolymer with vinyl acetate, butenehexene, etc., with a physical property of 0.5 g/10 min.
この考案のプレ防食鋼管杭を製作する場合は、
例えば押出機のＴダイから半溶融状態で連続して
帯状に押出されるポリエチレン樹脂系被覆材を、
予め加熱しかつ接着剤を塗布した鋼管杭の外表面
に対し、螺旋状にかつその被覆材の巾方向の一部
が相互に重なるように巻付け、次いでその巻付直
後に、加圧成形ロールにより加圧成形して各部が
1.5〜4.5mmの範囲内でほぼ均一な厚さになるよう
に仕上げる。 When manufacturing pre-corrosion-proof steel pipe piles of this invention,
For example, a polyethylene resin coating material that is continuously extruded into a belt shape in a semi-molten state from the T-die of an extruder,
It is wrapped spirally around the outer surface of a steel pipe pile that has been preheated and coated with adhesive so that a portion of the sheathing material overlaps each other in the width direction. Each part is pressure molded by
Finish to a uniform thickness within the range of 1.5 to 4.5 mm.
この考案によれば、水底地盤に打込まれる鋼管
杭１の外表面における少なくとも飛沫帯から干満
帯までの部分が、鋼管杭１の外表面に塗布された
接着剤を介して単層の架橋ポリエチレンを除くポ
リエチレン樹脂系被覆材２により連続して被覆さ
れるので、プレ防食鋼管杭を水底地盤に打込む際
に、打撃振動により前記ポリエチレン樹脂系被覆
材２が鋼管杭１に対し相対的にずれ動くことはな
く、かつ水底地盤に打込まれた鋼管杭１における
最も腐食し易い飛沫帯および干満帯に位置する部
分を、耐透水性、耐食性および耐スクラツチ性に
富む前記ポリエチレン樹脂系被覆材２により被覆
して、長期間にわたつて有効に防食することがで
き、特に鋼管杭１の外表面に接着剤を介して単層
の架橋ポリエチレンを除くポリエチレン樹脂系被
覆材２を固着しているので、構造が簡単であると
共に低コストで製造することができ、さらに前記
ポリエチレン樹脂系被覆材２の厚さは1.5mm以上
になつているので、前記被覆材２にピンホールが
あつても、そのピンホールが腐食生成物や気泡に
より閉塞されて、腐食の進行が抑制され、しかも
酸化劣化が防止され、かつ流木の衝突により前記
被覆材２に窪みが生じても、ピンホールによる腐
食の進行抑制に必要な厚さおよび酸化劣化防止に
必要な厚さを確保することができる。また前記ポ
リエチレン樹脂系被覆材２の厚さが4.5mm以下で
あるので、半溶融状態のポリエチレン樹脂系被覆
材２を鋼管杭１の外表面に塗布された接着剤の上
に巻付けてプレ防食鋼管杭を製造する場合、前記
被覆材２を容易に冷却してプレ防食鋼管杭を高能
率で製造できると共に、前記ポリエチレン樹脂系
被覆材２の使用量を少なくしてプレ防食鋼管杭を
経済的に製造することができる。さらにまた、鋼
管杭１の打込前に、その鋼管杭１の外表面に前記
ポリエチレン樹脂系被覆材２が被着されるので、
品質管理を充分に行なうことができ、しかもその
ポリエチレン樹脂系被覆材２は強固であるので、
ハンドリング中に傷がつきにくく、さらに前記ポ
リエチレン樹脂系被覆材２は長期の耐久性を有す
るので、メンテナンスが不要で経済的である等の
効果が得られる。
According to this invention, at least the portion from the splash zone to the tidal zone on the outer surface of the steel pipe pile 1 driven into the underwater ground is coated with a single layer of cross-linked polyethylene via an adhesive applied to the outer surface of the steel pipe pile 1. Since the pre-corrosion-proof steel pipe pile is continuously covered with the polyethylene resin sheathing material 2 except for The portions of the steel pipe pile 1 that do not move and are driven into the submerged ground and are located in the splash zone and tidal zone, which are most susceptible to corrosion, are coated with the polyethylene resin coating material 2 that is highly permeable, corrosion resistant, and scratch resistant. It is possible to effectively prevent corrosion over a long period of time by coating with a single layer of polyethylene resin coating material 2 other than cross-linked polyethylene, which is fixed to the outer surface of the steel pipe pile 1 via an adhesive. , the structure is simple and can be manufactured at low cost, and the thickness of the polyethylene resin coating material 2 is 1.5 mm or more, so even if there is a pinhole in the coating material 2, it will not be removed. The progress of corrosion is suppressed by blocking the pinholes with corrosion products and air bubbles, and furthermore, oxidative deterioration is prevented, and even if a dent is formed in the covering material 2 due to a collision with driftwood, the progress of corrosion due to the pinhole is suppressed. It is possible to secure the thickness necessary for the prevention of oxidative deterioration and the thickness necessary for preventing oxidative deterioration. In addition, since the thickness of the polyethylene resin sheathing material 2 is 4.5 mm or less, the semi-molten polyethylene resin sheathing material 2 is wrapped around the adhesive applied to the outer surface of the steel pipe pile 1 for pre-corrosion protection. When producing steel pipe piles, the coating material 2 can be easily cooled to produce pre-corrosion-proof steel pipe piles with high efficiency, and the amount of polyethylene resin-based coating material 2 used can be reduced to make pre-corrosion-proof steel pipe piles economical. can be manufactured. Furthermore, since the polyethylene resin coating material 2 is applied to the outer surface of the steel pipe pile 1 before driving the steel pipe pile 1,
Quality control can be carried out sufficiently, and the polyethylene resin coating material 2 is strong, so
It is not easily damaged during handling, and furthermore, the polyethylene resin coating material 2 has long-term durability, so that effects such as no maintenance required and economical effects can be obtained.
第１図ないし第３図はこの考案の第１実施例を
示すものであつて、第１図は水中用プレ防食鋼管
杭の側面図、第２図はそのＡ−Ａ線拡大断面図、
第３図は前記プレ防食鋼管杭をコンクリート構造
物の支持に使用した構造物の状態を示す一部縦断
側面図である。第４図はこの考案の第２実施例の
プレ防食鋼管杭によりコンクリート構造物を支持
した構造物の状態を示す一部縦断側面図である。
図において、１は鋼管杭、２はポリエチレン樹
脂系被覆材、４は飛沫帯、５は干満帯、６は水中
用プレ防食鋼管杭、７はコンクリート構造物であ
る。
Figures 1 to 3 show the first embodiment of this invention, in which Figure 1 is a side view of an underwater pre-corrosion-proof steel pipe pile, Figure 2 is an enlarged sectional view taken along line A-A,
FIG. 3 is a partially longitudinal side view showing the state of a structure in which the pre-corrosion-proof steel pipe piles are used to support a concrete structure. FIG. 4 is a partially vertical side view showing the state of a concrete structure supported by pre-corrosion-proof steel pipe piles according to the second embodiment of this invention. In the figure, 1 is a steel pipe pile, 2 is a polyethylene resin covering material, 4 is a splash zone, 5 is a tidal zone, 6 is a pre-corrosion-proof steel pipe pile for underwater use, and 7 is a concrete structure.
Claims (1)
る少なくとも飛沫帯から干満帯までの部分が、鋼
管杭１の外表面に塗布された接着剤を介して単層
の架橋ポリエチレンを除くポリエチレン樹脂系被
覆材２により連続して予め被覆され、その被覆材
２の厚さが1.5〜4.5mmに設定されていることを特
徴とする水中用プレ防食鋼管杭。 At least the portion from the splash zone to the tidal zone on the outer surface of the steel pipe pile 1 to be driven into the underwater ground is covered with a polyethylene resin-based coating excluding a single layer of cross-linked polyethylene via an adhesive applied to the outer surface of the steel pipe pile 1. 1. A pre-corrosion-proof steel pipe pile for underwater use, characterized in that it is continuously coated in advance with a material 2, and the thickness of the covering material 2 is set to 1.5 to 4.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4128783U JPS59167846U (en) | 1983-03-24 | 1983-03-24 | Underwater pre-heavy anti-corrosion steel pipe piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4128783U JPS59167846U (en) | 1983-03-24 | 1983-03-24 | Underwater pre-heavy anti-corrosion steel pipe piles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59167846U JPS59167846U (en) | 1984-11-10 |
| JPH0240106Y2 true JPH0240106Y2 (en) | 1990-10-26 |
Family
ID=30171877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4128783U Granted JPS59167846U (en) | 1983-03-24 | 1983-03-24 | Underwater pre-heavy anti-corrosion steel pipe piles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59167846U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5342403A (en) * | 1976-09-29 | 1978-04-17 | Mitsui Mining Co Ltd | Antiicorrosive and wearrresting foundation pile and method of manufacturing the same |
| JPS57123329A (en) * | 1981-01-20 | 1982-07-31 | Sekisui Chem Co Ltd | Construction of pile |
-
1983
- 1983-03-24 JP JP4128783U patent/JPS59167846U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5342403A (en) * | 1976-09-29 | 1978-04-17 | Mitsui Mining Co Ltd | Antiicorrosive and wearrresting foundation pile and method of manufacturing the same |
| JPS57123329A (en) * | 1981-01-20 | 1982-07-31 | Sekisui Chem Co Ltd | Construction of pile |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59167846U (en) | 1984-11-10 |
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