JP2018150765A - Steel sheet pile comprising structure in which bolt is hardly broken, or anti-corrosive structure of steel pipe sheet pile - Google Patents

Steel sheet pile comprising structure in which bolt is hardly broken, or anti-corrosive structure of steel pipe sheet pile Download PDF

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JP2018150765A
JP2018150765A JP2017048969A JP2017048969A JP2018150765A JP 2018150765 A JP2018150765 A JP 2018150765A JP 2017048969 A JP2017048969 A JP 2017048969A JP 2017048969 A JP2017048969 A JP 2017048969A JP 2018150765 A JP2018150765 A JP 2018150765A
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sheet pile
bolt
anticorrosion
steel pipe
corrosion
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JP6823509B2 (en
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圭史 落部
Keishi Ochibe
圭史 落部
義行 川瀬
Yoshiyuki Kawase
義行 川瀬
周 池田
Shu Ikeda
周 池田
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Nippon Steel Anti Corrosion Co Ltd
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Nippon Steel and Sumikin Anti Corrosion Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a steel sheet pile comprising a structure in which a bolt is hardly broken even by a collision of driftage such as driftwood and floating ice or an influence of waves, or an anti-corrosive structure of a steel pipe sheet pile.SOLUTION: An anti-corrosive structure is formed on a surface of a steel sheet pile or a steel pipe sheet pile, which constitutes a part of an existing structure. An anti-corrosion metal plate includes a body part for covering a trapezoidal cross-section body part of the steel sheet pile or a semi-circular cross-section body part of the steel pipe sheet pile, and a flat part that is formed at the margin of the body part. Fixing means includes a fixing plate that is fixed to the steel sheet pile or the steel pipe sheet pile, a bolt that is fixed to the fixing plate, and a nut that is screwed to the bolt. Additionally, it has a through-hole through which the tip of the bolt is passed, and a protective member capable of covering the tip. After the tip is passed through the through-hole of the protective member, the nut is screwed to the tip so that it can be fixed to the surface of the steel sheet pile or the steel pipe sheet pile.SELECTED DRAWING: Figure 2

Description

本発明はボルトが破損し難い構造を備える鋼矢板または鋼管矢板の防食構造体に関する。   The present invention relates to a steel sheet pile or a steel pipe sheet pile anticorrosion structure having a structure in which a bolt is not easily damaged.

海洋構造物や河川構造物等の既設構造物の少なくとも一部として用いられる鋼矢板は腐食しやすく、特に飛沫帯や干満帯において、その程度は顕著である。
そこで、従来、鋼矢板の表面に防食構造体を設置して防食する方法が適用されている。このような防食方法の一つとして、鋼矢板の表面に有機樹脂等からなる防食層を形成し、その表面に、さらに耐食性金属薄板を密着させ固定することで、防食構造体を設置する方法が知られている。
このような防食処理を施すことで、上記のような既設構造物に長期の防食性を付与することができる。また、繊維強化樹脂や発泡樹脂を用いて防食層を形成すれば、環境遮断性や耐衝撃性を付与することもできる。
このような防食方法は、例えば特許文献１〜３に記載されている。 Steel sheet piles used as at least a part of existing structures such as offshore structures and river structures are susceptible to corrosion, and the degree is particularly remarkable in the splash zone and tidal zone.
Therefore, conventionally, a method for preventing corrosion by installing an anticorrosion structure on the surface of a steel sheet pile has been applied. As one of such anticorrosion methods, there is a method of installing an anticorrosion structure by forming an anticorrosion layer made of an organic resin or the like on the surface of a steel sheet pile, and further attaching and fixing a corrosion-resistant metal thin plate on the surface. Are known.
By performing such anticorrosion treatment, long-term anticorrosion can be imparted to the existing structure as described above. Further, if the anticorrosion layer is formed using a fiber reinforced resin or a foamed resin, environmental barrier properties and impact resistance can be imparted.
Such anticorrosion methods are described in, for example, Patent Documents 1 to 3.

特開２００４−１３７８０１号公報JP 2004-137801 A 特開２０００−１８７０号公報JP 2000-1870 A 特開平１１−２８００５８号公報JP 11-280058 A

上記の防食層および耐食性金属板は、鋼矢板または鋼管矢板の固定したボルトを貫通させた後、ナットを螺合して締め付けることで固定する。ここでボルトの先端は外側（水側）へ露出して突き出ているため、流木や流氷のような漂流物がボルトへ衝突して破損したり、波浪による繰り返しの応力の付与の影響によってボルトが破損したりする場合があった。   The above-mentioned anticorrosion layer and corrosion-resistant metal plate are fixed by threading and fastening a nut after passing through a bolt secured to a steel sheet pile or steel pipe sheet pile. Here, the tip of the bolt is exposed and protrudes to the outside (water side), so drifting objects such as driftwood and ice floe collide with the bolt and are damaged, or the bolt is affected by repeated stress applied by waves. It was sometimes damaged.

本発明は、流木や流氷のような漂流物の衝突または波浪の影響によってもボルトが破損し難い構造を備える鋼矢板または鋼管矢板の防食構造体を提供することを目的とする。   An object of the present invention is to provide a steel sheet pile or a steel pipe sheet pile anticorrosion structure having a structure in which a bolt is not easily damaged by the impact of drifting objects such as driftwood or drift ice or the influence of waves.

本発明者は鋭意検討し、上記課題を解決する方法を見出し、本発明を完成させた。
本発明は次の（１）〜（５）である。
（１）既設構造物の一部である鋼矢板または鋼管矢板の表面に形成する、少なくとも防食層および耐食性金属板ならびにこれらを前記鋼矢板または前記鋼管矢板に固定する固定手段を含む防食構造体であって、
前記耐食性金属板は、前記鋼矢板の断面台形状の本体部分または前記鋼管矢板の断面半円形状の本体部分を覆う本体部と、前記本体部の辺縁に形成された平坦部とを含み、
前記固定手段は、前記鋼矢板または前記鋼管矢板に固定される固定板と、前記固定板に固定されたボルトと、前記ボルトと螺合するナットとを含み、
さらに、前記ボルトの先端部が通過する貫通孔と、前記ナットが通過可能な開口部とを備え、前記先端部を覆うことができる保護部材を有し、
前記固定板と前記平坦部との間に前記防食層が配置されていて、前記ボルトは前記防食層および前記平坦部を貫通させると、前記平坦部の表面側に前記ボルトの前記先端部が突き出る構造を備え、さらに前記先端部に前記保護部材の前記貫通孔を通過させた後、前記ナットを前記ボルトの前記先端部と螺合させることで前記鋼矢板または前記鋼管矢板の表面に固定される、防食構造体。
（２）前記保護部材が、前記開口部を塞ぐ蓋をさらに有する、上記（１）に記載の防食構造体。
（３）前記保護部材の内部が水中硬化形有機樹脂によって満たされている、上記（１）または（２）に記載の防食構造体。
（４）前記耐食性金属と前記防食層との間に、さらにクッション層を有する、上記（１）〜（３）のいずれかに記載の防食構造体。
（５）前記防食層と前記クッション層との間に、さらに遮水シートを有する、上記（４）に記載の防食構造体。 The inventor diligently studied and found a method for solving the above-mentioned problems, and completed the present invention.
The present invention includes the following (1) to (5).
(1) An anticorrosion structure including at least an anticorrosion layer and a corrosion-resistant metal plate formed on the surface of a steel sheet pile or a steel pipe sheet pile which is a part of an existing structure, and a fixing means for fixing them to the steel sheet pile or the steel pipe sheet pile. There,
The corrosion-resistant metal plate includes a main body part covering a trapezoidal main body part of the steel sheet pile or a semicircular main body part of the steel pipe sheet pile, and a flat part formed at the edge of the main body part,
The fixing means includes a fixing plate fixed to the steel sheet pile or the steel pipe sheet pile, a bolt fixed to the fixing plate, and a nut screwed with the bolt,
Furthermore, it has a through hole through which the tip of the bolt passes and an opening through which the nut can pass, and has a protective member that can cover the tip.
When the anticorrosion layer is disposed between the fixing plate and the flat portion, and the bolt penetrates the anticorrosion layer and the flat portion, the tip portion of the bolt protrudes to the surface side of the flat portion. The structure is further provided, and after the through hole of the protection member is passed through the tip portion, the nut is screwed to the tip portion of the bolt to be fixed to the surface of the steel sheet pile or the steel pipe sheet pile. , Anticorrosion structure.
(2) The anticorrosion structure according to (1), wherein the protective member further includes a lid that closes the opening.
(3) The anticorrosion structure according to (1) or (2), wherein the inside of the protective member is filled with an underwater curable organic resin.
(4) The anticorrosion structure according to any one of (1) to (3), further including a cushion layer between the corrosion-resistant metal and the anticorrosion layer.
(5) The anticorrosion structure according to (4), further including a water shielding sheet between the anticorrosion layer and the cushion layer.

本発明によれば、流木や流氷のような漂流物の衝突または波浪の影響によってもボルトが破損し難い構造を備える鋼矢板または鋼管矢板の防食構造体を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the anticorrosion structure of the steel sheet pile or steel pipe sheet pile provided with the structure where a volt | bolt cannot be damaged easily also by the influence of the impact of drifting objects, such as driftwood and drift ice, or a wave.

護岸Ｇに設置された鋼矢板の海側に、本発明の防食構造体を取り付けた状態を示す概略斜視図である。It is a schematic perspective view which shows the state which attached the anticorrosion structure of this invention to the sea side of the steel sheet pile installed in the revetment G. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 本発明の防食構造体が有する保護部材の一例を示す概略斜視図である。It is a schematic perspective view which shows an example of the protection member which the anticorrosion structure of this invention has. 本発明の防食構造体が有する保護部材の別の例を示す概略斜視図である。It is a schematic perspective view which shows another example of the protection member which the anticorrosion structure of this invention has. 護岸Ｇに設置された鋼管矢板の海側に、本発明の防食構造体を取り付けた状態を示す概略断面図である。It is a schematic sectional drawing which shows the state which attached the anticorrosion structure of this invention to the sea side of the steel pipe sheet pile installed in the revetment G.

本発明の防食構造体について説明する。
本発明の防食構造体は、既設構造物の一部である鋼矢板または鋼管矢板の表面に形成するものである。また、本発明の防食構造体は、少なくとも防食層および耐食性金属板ならびにこれらを前記鋼矢板または前記鋼管矢板に固定する固定手段を含む。 The anticorrosion structure of the present invention will be described.
The anticorrosion structure of the present invention is formed on the surface of a steel sheet pile or steel pipe sheet pile that is a part of an existing structure. The anticorrosion structure of the present invention includes at least an anticorrosion layer, a corrosion-resistant metal plate, and fixing means for fixing them to the steel sheet pile or the steel pipe sheet pile.

本発明の防食構造体において既設構造物とは、例えば海洋構造物、河川構造物、港湾構造物等であり、主に水（海水等）と接触する部位を備える既設の構造物である。このような既設構造物は海水等の水と接触する部位、例えば飛沫帯や干満帯に、鋼矢板または鋼管矢板を有している場合がある。
本発明の防食構造体は、このような鋼矢板または鋼管矢板を防食するために用いるものである。 In the anticorrosion structure of the present invention, the existing structure is, for example, an offshore structure, a river structure, a harbor structure, or the like, and is an existing structure having a portion that mainly contacts water (seawater or the like). Such an existing structure may have a steel sheet pile or a steel pipe sheet pile in a portion that comes into contact with water such as seawater, for example, a splash zone or a tidal zone.
The anticorrosion structure of the present invention is used for anticorrosion of such a steel sheet pile or steel pipe sheet pile.

［実施態様１］
本発明の防食構造体について、具体的な実施態様を示す図を用いて説明する。
図１および図２は、海洋構造物である鋼矢板２が護岸Ｇに設置されており、その鋼矢板２の海Ｓ側（外側）に、本発明の防食構造体１を取り付けた状態を示す図であり、図１が概略斜視図、図２が図１のＡ−Ａ線断面図である。
図１および図２に示す具体的な実施態様を、以下では「実施態様１」ともいう。
なお、本発明の防食構造体において、既設構造物に対して海水等の水が存在するサイドを「外側」、その反対サイドを「内側」ともいう。したがって、実施態様１の場合であれば、護岸Ｇに対して海Ｓ側が「外側」であり、その反対サイドが「内側」である。 [Embodiment 1]
The anticorrosion structure of the present invention will be described with reference to drawings showing specific embodiments.
1 and 2 show a state where a steel sheet pile 2 which is an offshore structure is installed on the revetment G, and the anticorrosion structure 1 of the present invention is attached to the sea S side (outside) of the steel sheet pile 2. 1 is a schematic perspective view, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
The specific embodiment shown in FIGS. 1 and 2 is also referred to as “embodiment 1” below.
In the anticorrosion structure of the present invention, the side where water such as seawater is present with respect to the existing structure is also referred to as “outside”, and the opposite side is also referred to as “inside”. Therefore, in the case of Embodiment 1, the sea S side is “outside” with respect to the revetment G, and the opposite side is “inside”.

実施態様１において鋼矢板２は、凸側鋼矢板２１と凹状鋼矢板２３とが交互に連結される構造となっており、護岸Ｇの支持壁体を構成している。凸側鋼矢板２１は、海Ｓ側に設けられるウェブ２１１と、このウェブ２１１の両側に繋がる一対のフランジ２１３と、フランジ２１３の先端の継手部２１５とを備えている。ここで、ウェブ２１１およびフランジ２１３が、本発明の防食構造体における鋼矢板の断面台形状の本体部分に相当する。
また、凹側鋼矢板２３は、護岸Ｇ側に設けられるウェブ２３１と、このウェブ２３１の両側に繋がる一対のフランジ２３３と、フランジ２３３の先端の継手部２３５とを備えている。ここで、ウェブ２３１およびフランジ２３３が、本発明の防食構造体における鋼矢板の断面台形状の本体部分に相当する。
そして、継手部２１５と継手部２３５とが繋がることで、凸側鋼矢板２１と凹状鋼矢板２３とが連結している。 In Embodiment 1, the steel sheet pile 2 has a structure in which the convex steel sheet piles 21 and the concave steel sheet piles 23 are alternately connected, and constitutes a support wall body of the revetment G. The convex steel sheet pile 21 includes a web 211 provided on the sea S side, a pair of flanges 213 connected to both sides of the web 211, and a joint portion 215 at the tip of the flange 213. Here, the web 211 and the flange 213 correspond to a main body portion having a trapezoidal cross section of the steel sheet pile in the anticorrosion structure of the present invention.
The concave steel sheet pile 23 includes a web 231 provided on the revetment G side, a pair of flanges 233 connected to both sides of the web 231, and a joint portion 235 at the tip of the flange 233. Here, the web 231 and the flange 233 correspond to the trapezoidal cross-sectional body portion of the steel sheet pile in the anticorrosion structure of the present invention.
And the convex side steel sheet pile 21 and the concave steel sheet pile 23 are connected by the joint part 215 and the joint part 235 being connected.

実施態様１において本発明の防食構造体１は、内側に防食層１５を備え、その外側にクッション層１７を備え、さらにその外側に耐食性金属板１１、１３を備えている。そして、固定手段３によって、防食層１５、クッション層１７および耐食性金属板１１、１３が鋼矢板２の表面に密着するように固定されている。
なお、図１では防食層１５およびクッション層１７の記載を省略している。 In Embodiment 1, the anticorrosion structure 1 of the present invention includes an anticorrosion layer 15 on the inside, a cushion layer 17 on the outside, and further includes corrosion-resistant metal plates 11 and 13 on the outside. The anticorrosion layer 15, the cushion layer 17, and the corrosion-resistant metal plates 11 and 13 are fixed by the fixing means 3 so as to be in close contact with the surface of the steel sheet pile 2.
In FIG. 1, the description of the anticorrosion layer 15 and the cushion layer 17 is omitted.

＜耐食性金属板＞
本発明の防食構造体１が備える凸側の耐食性金属板１１について説明する。
図１、図２において、凸側の耐食性金属板１１は、凸側鋼矢板２１の幅と略同一の幅の寸法を有しており、凸側鋼矢板２１のウェブ２１１に沿う突状部１１１と、フランジ２１３に沿う傾斜部１１３と、傾斜部１１３と繋がる平坦部１１５とを有しており、護岸Ｇに開口した断面が略コ字状の形状を有している。ここで突状部１１１および傾斜部１１３からなる部分が、本発明の防食構造体の耐食性金属板における本体部に相当する。 <Corrosion-resistant metal plate>
The convex side corrosion-resistant metal plate 11 provided in the anticorrosion structure 1 of the present invention will be described.
In FIG. 1 and FIG. 2, the convex-side corrosion-resistant metal plate 11 has a width dimension substantially the same as the width of the convex-side steel sheet pile 21, and the protruding portion 111 along the web 211 of the convex-side steel sheet pile 21. And the inclined portion 113 along the flange 213 and the flat portion 115 connected to the inclined portion 113, and the cross section opened to the revetment G has a substantially U-shaped shape. Here, the portion composed of the protruding portion 111 and the inclined portion 113 corresponds to the main body portion of the corrosion-resistant metal plate of the corrosion-proof structure according to the present invention.

次に、本発明の防食構造体１が備える凹側の耐食性金属板１３について説明する。
耐食性金属板１３についても、前述の耐食性金属板１１と同様である。
耐食性金属板１３は、凹側鋼矢板２３の幅と略同一の幅の寸法を有しており、凹側鋼矢板２３のウェブ２３１に沿う後退部１３１と、フランジ２３３に沿う傾斜部１３３と、傾斜部１３３と繋がる平坦部１３５とを有しており、海Ｓ側に開口した断面が略コ字状の形状を有している。ここで後退部１３１および傾斜部１３３からなる部分が、本発明の防食構造体の耐食性金属板における本体部に相当する。 Next, the concave side corrosion-resistant metal plate 13 provided in the anticorrosion structure 1 of the present invention will be described.
The corrosion-resistant metal plate 13 is the same as the above-described corrosion-resistant metal plate 11.
The corrosion-resistant metal sheet 13 has a width dimension substantially the same as the width of the concave steel sheet pile 23, a receding part 131 along the web 231 of the concave steel sheet pile 23, an inclined part 133 along the flange 233, It has the flat part 135 connected with the inclination part 133, and the cross section opened to the sea S side has a substantially U-shaped shape. Here, the portion composed of the receding portion 131 and the inclined portion 133 corresponds to the main body portion in the corrosion-resistant metal plate of the anticorrosion structure of the present invention.

耐食性金属板の材質は特に限定されない。例えば耐食性金属として、チタン、チタン合金、ステンレス（例えばＳＵＳ３１６、ＳＵＳ３１６Ｌ、ＳＵＳ３１７、ＳＵＳ３１７にＣｕ、Ｎ等を添加して耐孔食性等を改善したもの等）が挙げられ、チタンまたはチタン合金であることが好ましい。
耐食性金属板の板厚も特に限定されないが０．３〜３．０ｍｍが好ましく、０．６〜１．０ｍｍがより好ましい。軽量であり施工時の取扱いが容易だからである。
また、耐食性金属板は２枚以上を接合したものであってもよい。 The material of the corrosion-resistant metal plate is not particularly limited. For example, examples of the corrosion resistant metal include titanium, titanium alloy, and stainless steel (for example, SUS316, SUS316L, SUS317, SUS317 added with Cu, N, etc. to improve pitting corrosion resistance, etc.), and are titanium or titanium alloy. Is preferred.
The thickness of the corrosion-resistant metal plate is not particularly limited, but is preferably 0.3 to 3.0 mm, and more preferably 0.6 to 1.0 mm. This is because it is lightweight and easy to handle during construction.
Further, the corrosion-resistant metal plates may be obtained by joining two or more sheets.

＜防食層＞
防食層１５は鋼矢板２の外側の表面に密着するように設けられる。
防食層は従来公知の防食剤を用いて形成することができる。例えば、市販の防食剤であるペトロラタム（ペトロラタムペースト、ペトロラタムシート）、エポキシ樹脂、酸化重合樹脂などを用いて防食層を形成することができる。例えばペトロラタムシートを耐食性金属の内側または鋼矢板の表面に貼り付け、その外側または表面にペトロラタムペーストを塗布して防食層を形成することができる。
鋼矢板の外側の表面に密着するように設ける防食層の量は、鋼矢板の単位面積当たりの防食層の質量として、２．０〜４．０ｋｇ／ｍ2であることが好ましく、２．０〜３．０ｋｇ／ｍ2であることがより好ましく、２．０〜２．５ｋｇ／ｍ2であることがより好ましく、２．０〜２．２ｋｇ／ｍ2であることがさらに好ましい。
また、防食層の厚さは特に限定されないが、２〜５ｍｍであることが好ましく、２〜４ｍｍであることがより好ましく、２〜３ｍｍであることがより好ましい。 <Anti-corrosion layer>
The anticorrosion layer 15 is provided in close contact with the outer surface of the steel sheet pile 2.
The anticorrosion layer can be formed using a conventionally known anticorrosion agent. For example, the anticorrosive layer can be formed using a commercially available anticorrosive agent such as petrolatum (petrolatum paste, petrolatum sheet), an epoxy resin, or an oxidation polymerization resin. For example, a petrolatum sheet can be attached to the inside of a corrosion-resistant metal or the surface of a steel sheet pile, and a petrolatum paste can be applied to the outside or the surface to form an anticorrosion layer.
The amount of the anticorrosion layer provided so as to be in close contact with the outer surface of the steel sheet pile is preferably 2.0 to 4.0 kg / m 2 as the mass of the anticorrosion layer per unit area of the steel sheet pile. more preferably ~3.0kg / m 2, more preferably from 2.0~2.5kg / m 2, further preferably 2.0~2.2kg / m 2.
Moreover, the thickness of the anticorrosion layer is not particularly limited, but is preferably 2 to 5 mm, more preferably 2 to 4 mm, and even more preferably 2 to 3 mm.

＜クッション層＞
本発明の防食構造体は、防食層１５と耐食性金属板１１、１３との間に、緩衝材からなるクッション層１７を備えてもよい。
緩衝材としては、発泡ポリエチレンが挙げられる。
クッション層１７の厚さは特に限定されないが、５〜２０ｍｍであることが好ましく、１０〜１５ｍｍであることがより好ましい。 <Cushion layer>
The anticorrosion structure of the present invention may include a cushion layer 17 made of a cushioning material between the anticorrosion layer 15 and the corrosion-resistant metal plates 11 and 13.
Examples of the buffer material include foamed polyethylene.
Although the thickness of the cushion layer 17 is not specifically limited, It is preferable that it is 5-20 mm, and it is more preferable that it is 10-15 mm.

＜遮水シート＞
本発明の防食構造体は、防食層１５とクッション層１７との間に、さらに遮水シートを有してもよい。
遮水シートとして例えば従来公知のポリエチレンからなるシートを利用することができる。 <Water shielding sheet>
The anticorrosion structure of the present invention may further include a water shielding sheet between the anticorrosion layer 15 and the cushion layer 17.
For example, a conventionally known sheet made of polyethylene can be used as the water shielding sheet.

＜固定手段＞
実施態様１において、固定手段３は、固定板３１と、ボルト３３と、押え板３５と、ナット３７とからなる。
なお、本発明の防食構造体は押え板３５を有することが好ましい。押え板３５は硬質のものであって容易に変形しないものであれば特に限定されないが、例えば金属（ステンレス等）やＦＲＰからなる板であってよい。ただし、金属を用いる場合は異種金属接触腐食を起こさないものが望ましい。押え板３５は平坦部１１５に固定されていることが好ましい。押え板３５の平端部１１５への固定には、接着剤による接着、リベット等による機械的接続を利用できる。
固定板３１は凹側鋼矢板２３の継手部２３５の海Ｓ側の表面に溶接固定されている。また、ボルト３３は、固定板３１に固定されて海Ｓ側に突出している。そして、防食層１５、クッション層１７および耐食性金属板１３の平坦部１３５に設けた挿通孔にボルト３３を挿通させ、さらに海Ｓ側から耐食性金属１１の平坦部１１５および押え板３５に設けた挿通孔にボルト３３を挿通させると、平坦部１１５の表面側（海Ｓ側）にボルト３３の先端部が突き出る。この突き出た先端部を保護部材５によって覆う。 <Fixing means>
In the first embodiment, the fixing means 3 includes a fixing plate 31, a bolt 33, a presser plate 35, and a nut 37.
The anticorrosion structure of the present invention preferably has a presser plate 35. The presser plate 35 is not particularly limited as long as it is hard and does not easily deform. For example, the presser plate 35 may be a plate made of metal (such as stainless steel) or FRP. However, when metal is used, it is desirable that it does not cause different metal contact corrosion. The presser plate 35 is preferably fixed to the flat portion 115. For fixing the presser plate 35 to the flat end portion 115, adhesion by an adhesive, mechanical connection by rivets or the like can be used.
The fixing plate 31 is welded and fixed to the surface on the sea S side of the joint portion 235 of the concave steel sheet pile 23. The bolt 33 is fixed to the fixed plate 31 and protrudes toward the sea S side. Then, the bolt 33 is inserted into the insertion hole provided in the flat portion 135 of the anticorrosion layer 15, the cushion layer 17 and the corrosion-resistant metal plate 13, and the insertion provided in the flat portion 115 of the corrosion-resistant metal 11 and the presser plate 35 from the sea S side. When the bolt 33 is inserted through the hole, the tip of the bolt 33 protrudes on the surface side (sea S side) of the flat portion 115. The protruding tip is covered with the protective member 5.

＜保護部材＞
保護部材５について、図３、図４を用いて説明する。
保護部材５は、例えば図３に示すような、加工した角パイプであってよい。図３に示す保護部材５は、従来公知の角パイプの１つの面を長手方向に切り、開口部５１を形成し、さらに開口部５１を形成した面と向かい合う面に、ボルト３３の先端部を貫通させることができる貫通孔５３を形成したものである。ここで開口部５１の幅は、ナット３７を通過させることができる程度とする。
なお、図３に示した態様は、角パイプの１つの面を長手方向に切って開口部５１を形成したものであるが、貫通孔５３を形成した面と向かい合う面に、ボルト３３およびボルト３３を締め込むための器具を通過させることができ、かつ、ボルト３３を締め込む作業を行うことができる程度の大きさの開口部（開口部５１）を形成してもよい。 <Protective member>
The protection member 5 is demonstrated using FIG. 3, FIG.
The protective member 5 may be a processed square pipe as shown in FIG. 3, for example. The protective member 5 shown in FIG. 3 is formed by cutting one surface of a conventionally known square pipe in the longitudinal direction to form an opening 51, and the tip of the bolt 33 on the surface facing the surface on which the opening 51 is formed. A through-hole 53 that can be penetrated is formed. Here, the width of the opening 51 is set such that the nut 37 can pass therethrough.
In the embodiment shown in FIG. 3, one surface of the square pipe is cut in the longitudinal direction to form the opening 51, but the bolt 33 and the bolt 33 are formed on the surface facing the surface on which the through hole 53 is formed. You may form the opening part (opening part 51) of the magnitude | size which can pass the instrument for tightening and can perform the operation | work which tightens the volt | bolt 33. FIG.

保護部材５は、図４（ｂ）、（ｃ）に示すような、さらに開口部５１を塞ぐ蓋５５を有する態様であることが好ましい。図４（ａ）は図２および図３に示したものと同様に、蓋を有さない態様を示しているが、図４（ｂ）、（ｃ）に示すように開口部５１を塞ぐ蓋５５を有していると、より強固にボルト３３を保護することができるので好ましい。   It is preferable that the protection member 5 is an aspect which has the lid | cover 55 which further closes the opening part 51 as shown in FIG.4 (b), (c). 4 (a) shows an embodiment without a lid, similar to those shown in FIGS. 2 and 3, but a lid for closing the opening 51 as shown in FIGS. 4 (b) and 4 (c). If it has 55, since the volt | bolt 33 can be protected more firmly, it is preferable.

また、保護部材の内部の空間５８が、水中硬化形有機樹脂によって満たされていることが好ましい。より強固にボルト３３を保護することができるからである。通常、水中硬化形有機樹脂によって保護部材の内部の空間を満たす場合、蓋５５を設置する。
水中硬化形有機樹脂としては、例えば水中硬化形エポキシパテを用いることができる。 Moreover, it is preferable that the space 58 inside the protective member is filled with an underwater curable organic resin. This is because the bolt 33 can be protected more firmly. Normally, when the space inside the protective member is filled with an underwater curable organic resin, the lid 55 is installed.
As the underwater curable organic resin, for example, an underwater curable epoxy putty can be used.

このような保護部材５における貫通孔５３に、ボルト３３の先端部を通過させた後、開口部５１を通過させたナット３７をボルト３３の先端部と螺合させ、締め付けることで、本発明の防食構造体１を固定することができる。ここで保護部材５と耐食性金属１１、１３との間に押え板３５を配置することが好ましい。
また、ボルト３３と耐食性金属板１１、１３とが電気的に接触しないように適切に絶縁することが好ましい。 After passing the tip of the bolt 33 through the through-hole 53 in the protective member 5, the nut 37 that has passed through the opening 51 is screwed into the tip of the bolt 33 and tightened. The anticorrosion structure 1 can be fixed. Here, it is preferable to dispose the presser plate 35 between the protective member 5 and the corrosion-resistant metals 11 and 13.
Moreover, it is preferable to insulate appropriately so that the bolt 33 and the corrosion-resistant metal plates 11 and 13 do not come into electrical contact.

［実施態様２］
次に、本発明の防食構造体の別の具体的な実施態様について説明する。
図５は、海洋構造物である鋼管矢板６が護岸Ｇに設置されており、その鋼管矢板６の海Ｓ側（外側）に、本発明の防食構造体７を取り付けた状態を示す概略断面図である。
図５に示す具体的な実施態様を、以下では「実施態様２」ともいう。
なお、前述のように、既設構造物に対して海水等の水が存在するサイドを「外側」、その反対サイドを「内側」ともいうため、実施態様２の場合であれば、護岸Ｇに対して海Ｓ側が「外側」であり、その反対サイドが「内側」である。 [Embodiment 2]
Next, another specific embodiment of the anticorrosion structure of the present invention will be described.
FIG. 5 is a schematic cross-sectional view showing a state where a steel pipe sheet pile 6 which is an offshore structure is installed on the revetment G, and the anticorrosion structure 7 of the present invention is attached to the sea S side (outside) of the steel pipe sheet pile 6. It is.
The specific embodiment shown in FIG. 5 is also referred to as “embodiment 2” below.
As described above, the side where seawater or the like is present is referred to as “outside” and the opposite side is also referred to as “inside” with respect to the existing structure. The sea S side is “outside” and the opposite side is “inside”.

図５において、鋼管矢板６は、長尺筒型鋼材で形成された断面半円形状の本体部分６１と、２つの本体部分６１に挟まれるように配置された連結部６２とを有する。本体部分６１を連結部６２が連結することで、壁面状の構造物（既設構造物）を構成している。なお、図５において鋼管矢板６の断面は円形状であるが、このうちの約半分（半円形部分）を、鋼管矢板６における本体部分とする。
また、連結部６２は本体部分６１に対して小径の円筒からなり、その周方向の一部が切断されて、この切断部分に他の円筒を装入することで連結部６２をなしている。 In FIG. 5, the steel pipe sheet pile 6 includes a main body portion 61 having a semicircular cross section formed of a long cylindrical steel material, and a connecting portion 62 disposed so as to be sandwiched between two main body portions 61. By connecting the main body portion 61 to the connecting portion 62, a wall-like structure (existing structure) is configured. In addition, in FIG. 5, although the cross section of the steel pipe sheet pile 6 is circular shape, about half (half-circle part) of these is made into the main-body part in the steel pipe sheet pile 6. FIG.
The connecting portion 62 is formed of a small-diameter cylinder with respect to the main body portion 61, and a part of the circumferential direction is cut, and the connecting portion 62 is formed by inserting another cylinder into the cut portion.

実施形態２の鋼管矢板６は、港湾施設の岸壁構造物を構築するために用いられる。このような用途では、海水に曝されることによる腐食が進行しやすい。そこで、実施形態２の鋼管矢板６には、本発明の防食構造体７を好ましく適用することができる。   The steel pipe sheet pile 6 of Embodiment 2 is used in order to construct a quay structure of a harbor facility. In such applications, corrosion due to exposure to seawater tends to proceed. Therefore, the anticorrosion structure 7 of the present invention can be preferably applied to the steel pipe sheet pile 6 of the second embodiment.

実施態様２において本発明の防食構造体７は、鋼管矢板６の表面に形成された防食層７５を備え、その外側にクッション層７７を備え、さらにその外側に耐食性金属板８を備えている。そして、固定手段９によって、防食層７５、クッション層７７および耐食性金属板３８が鋼管矢板６の表面に密着するように固定されている。   In Embodiment 2, the anticorrosion structure 7 of the present invention includes an anticorrosion layer 75 formed on the surface of the steel pipe sheet pile 6, a cushion layer 77 on the outside thereof, and a corrosion resistant metal plate 8 on the outside thereof. The anticorrosion layer 75, the cushion layer 77, and the corrosion-resistant metal plate 38 are fixed by the fixing means 9 so as to be in close contact with the surface of the steel pipe sheet pile 6.

＜耐食性金属板＞
本発明の防食構造体７が備える耐食性金属板８について説明する。
耐食性金属板８は、鋼管矢板６の本体部分６１に沿った断面半円形状の本体部８１と、その両端（辺縁）に形成された締め付け固定用の平坦部８２とを有する。
耐食性金属板の材質、大きさ、厚さ等は、前述の実施態様１の場合と同様であってよい。
なお、図５に示すように、隣り合う耐食性金属板８における平坦部８２同士が接触しておらず、これらの間が空いている場合、クッション層７７の露出を避けるために、平坦部８２の間に連結板８３を設置することが好ましい。連結板８３は耐食性金属板と同様の材質、厚さ等のものであってよい。図５に示すように、連結板８３を平坦部８２の下面側に載置し、平坦部８２と共に固定手段によって固定することが好ましい。 <Corrosion-resistant metal plate>
The corrosion-resistant metal plate 8 provided in the anticorrosion structure 7 of the present invention will be described.
The corrosion-resistant metal plate 8 has a main body portion 81 having a semicircular cross section along the main body portion 61 of the steel pipe sheet pile 6 and flat portions 82 for fastening and fixing formed at both ends (edges) thereof.
The material, size, thickness and the like of the corrosion-resistant metal plate may be the same as those in the first embodiment.
In addition, as shown in FIG. 5, when the flat parts 82 in the adjacent corrosion-resistant metal plates 8 are not in contact with each other and the space between them is open, in order to avoid the cushion layer 77 from being exposed, It is preferable to install the connecting plate 83 between them. The connecting plate 83 may be of the same material and thickness as the corrosion-resistant metal plate. As shown in FIG. 5, the connecting plate 83 is preferably placed on the lower surface side of the flat portion 82 and fixed together with the flat portion 82 by a fixing means.

＜防食層＞
防食層７５は鋼管矢板６の外側の表面に密着するように設けられる。
防食層に用いる防食材の種類、量、厚さ等は、前述の実施態様１の場合と同様であってよい。 <Anti-corrosion layer>
The anticorrosion layer 75 is provided in close contact with the outer surface of the steel pipe sheet pile 6.
The kind, amount, thickness, and the like of the anticorrosive material used for the anticorrosion layer may be the same as those in the first embodiment.

＜クッション層＞
本発明の防食構造体７は、前述の本発明の防食構造体１の場合と同様に、防食層７５と耐食性金属板８との間に、緩衝材からなるクッション層７７を備えてもよい。
緩衝材の種類や層厚等は、前述の実施態様１の場合と同様であってよい。 <Cushion layer>
The anticorrosion structure 7 of the present invention may include a cushion layer 77 made of a cushioning material between the anticorrosion layer 75 and the corrosion-resistant metal plate 8 as in the case of the anticorrosion structure 1 of the present invention described above.
The type and layer thickness of the cushioning material may be the same as those in the first embodiment.

＜遮水シート＞
本発明の防食構造体２は、前述の本発明の防食構造体１の場合と同様に、防食層７５とクッション層７７との間に、さらに遮水シートを有してもよい。
遮水シートの種類等は、前述の実施態様１の場合と同様であってよい。 <Water shielding sheet>
The anticorrosion structure 2 of the present invention may further include a water shielding sheet between the anticorrosion layer 75 and the cushion layer 77 as in the case of the anticorrosion structure 1 of the present invention described above.
The type of the water shielding sheet and the like may be the same as those in the first embodiment.

＜固定手段＞
実施態様２において、固定手段９は、固定板９１と、ボルト９４と、押え板９５と、ナット９７とからなる。なお、本発明の防食構造体は押え板９５を有することが好ましい。押え板９５は前述の実施態様１の場合と同様のものであってよい。
固定板９１は鋼管矢板６および／または連結部６２の表面に溶接固定されている。また、ボルト９４は、固定板９１に固定されて海Ｓ側に突出している。そして、防食層７５、クッション層７７、連結板８３および耐食性金属板８の平坦部８２に設けた挿通孔にボルト９４を挿通させ、さらに海Ｓ側から押え板９５に設けた挿通孔にボルト９４を挿通させると、平坦部８２の表面側（海Ｓ側）にボルト９４の先端部が突き出る。この突き出た先端部を保護部材１０によって覆う。 <Fixing means>
In the second embodiment, the fixing means 9 includes a fixing plate 91, a bolt 94, a presser plate 95, and a nut 97. The anticorrosion structure of the present invention preferably has a presser plate 95. The holding plate 95 may be the same as that in the first embodiment.
The fixing plate 91 is welded and fixed to the surface of the steel pipe sheet pile 6 and / or the connecting portion 62. The bolt 94 is fixed to the fixing plate 91 and protrudes toward the sea S side. Then, the bolt 94 is inserted into the insertion hole provided in the flat portion 82 of the anticorrosion layer 75, the cushion layer 77, the connecting plate 83, and the corrosion-resistant metal plate 8, and the bolt 94 is inserted into the insertion hole provided in the presser plate 95 from the sea S side. Is inserted, the tip end of the bolt 94 protrudes on the surface side (sea S side) of the flat portion 82. The protruding tip is covered with the protective member 10.

＜保護部材＞
保護部材１０は、前述の実施態様１の場合と同様のものであってよい。 <Protective member>
The protection member 10 may be the same as that in the first embodiment.

１ 本発明の防食構造体
１１ 耐食性金属板
１１１ 突状部
１１３ 傾斜部
１１５ 平坦部
１３ 耐食性金属板
１３１ 後退部
１３３ 傾斜部
１３５ 平坦部
１５ 防食層
１７ クッション層
２ 鋼矢板
２１ 凸側鋼矢板
２１１ ウェブ
２１３ フランジ
２１５ 継手部
２３ 凹側鋼矢板
２３１ ウェブ
２３３ フランジ
２３５ 継手部
３ 固定手段
３１ 固定板
３３ ボルト
３５ 押え板
３７ ナット・ワッシャー
５ 保護部材
５１ 開口部
５３ 貫通孔
５５ 蓋
Ｇ 護岸
Ｓ 海
６ 鋼管矢板
６１ 本体部分
６２ 連結部
７ 本発明の防食構造体
７５ 防食層
７７ クッション層
８ 耐食性金属板
８１ 本体部
８２ 平坦部
８３ 連結板
９ 固定手段
９１ 固定板
９４ ボルト
９５ 押え板
９７ ナット・ワッシャー
１０ 保護部材
５８ 水中硬化形有機樹脂 DESCRIPTION OF SYMBOLS 1 Corrosion-proof structure of this invention 11 Corrosion-resistant metal plate 111 Protruding part 113 Inclination part 115 Flat part 13 Corrosion-resistant metal plate 131 Retraction part 133 Inclination part 135 Flat part 15 Corrosion prevention layer 17 Cushion layer 2 Steel sheet pile 21 Convex side steel sheet pile 211 Web 213 Flange 215 Joint portion 23 Concave side steel sheet pile 231 Web 233 Flange 235 Joint portion 3 Fixing means 31 Fixing plate 33 Bolt 35 Press plate 37 Nut washer 5 Protection member 51 Opening portion 53 Through hole 55 Lid G Seawall S Sea 6 Steel pipe sheet pile 61 Body portion 62 Connection portion 7 Corrosion protection structure of the present invention 75 Corrosion protection layer 77 Cushion layer 8 Corrosion resistant metal plate 81 Body portion 82 Flat portion 83 Connection plate 9 Fixing means 91 Fixing plate 94 Bolt 95 Press plate 97 Nut / washer 10 Protection member 58 Underwater curing type organic resin

Claims (5)

既設構造物の一部である鋼矢板または鋼管矢板の表面に形成する、少なくとも防食層および耐食性金属板ならびにこれらを前記鋼矢板または前記鋼管矢板に固定する固定手段を含む防食構造体であって、
前記耐食性金属板は、前記鋼矢板の断面台形状の本体部分または前記鋼管矢板の断面半円形状の本体部分を覆う本体部と、前記本体部の辺縁に形成された平坦部とを含み、
前記固定手段は、前記鋼矢板または前記鋼管矢板に固定される固定板と、前記固定板に固定されたボルトと、前記ボルトと螺合するナットとを含み、
さらに、前記ボルトの先端部が通過する貫通孔と、前記ナットが通過可能な開口部とを備え、前記先端部を覆うことができる保護部材を有し、
前記固定板と前記平坦部との間に前記防食層が配置されていて、前記ボルトは前記防食層および前記平坦部を貫通させると、前記平坦部の表面側に前記ボルトの前記先端部が突き出る構造を備え、さらに前記先端部に前記保護部材の前記貫通孔を通過させた後、前記ナットを前記ボルトの前記先端部と螺合させることで前記鋼矢板または前記鋼管矢板の表面に固定される、防食構造体。 A corrosion prevention structure including at least a corrosion prevention layer and a corrosion resistant metal plate formed on the surface of a steel sheet pile or a steel pipe sheet pile which is a part of an existing structure, and a fixing means for fixing them to the steel sheet pile or the steel pipe sheet pile,
The corrosion-resistant metal plate includes a main body part covering a trapezoidal main body part of the steel sheet pile or a semicircular main body part of the steel pipe sheet pile, and a flat part formed at the edge of the main body part,
The fixing means includes a fixing plate fixed to the steel sheet pile or the steel pipe sheet pile, a bolt fixed to the fixing plate, and a nut screwed with the bolt,
Furthermore, it has a through hole through which the tip of the bolt passes and an opening through which the nut can pass, and has a protective member that can cover the tip.
When the anticorrosion layer is disposed between the fixing plate and the flat portion, and the bolt penetrates the anticorrosion layer and the flat portion, the tip portion of the bolt protrudes to the surface side of the flat portion. The structure is further provided, and after the through hole of the protection member is passed through the tip portion, the nut is screwed to the tip portion of the bolt to be fixed to the surface of the steel sheet pile or the steel pipe sheet pile. , Anticorrosion structure. 前記保護部材が、前記開口部を塞ぐ蓋をさらに有する、請求項１に記載の防食構造体。   The anticorrosion structure according to claim 1, wherein the protective member further includes a lid that closes the opening. 前記保護部材の内部が水中硬化形有機樹脂によって満たされている、請求項１または２に記載の防食構造体。   The anticorrosion structure according to claim 1 or 2, wherein the inside of the protective member is filled with an underwater curable organic resin. 前記耐食性金属と前記防食層との間に、さらにクッション層を有する、請求項１〜３のいずれかに記載の防食構造体。   The anticorrosion structure according to any one of claims 1 to 3, further comprising a cushion layer between the corrosion-resistant metal and the anticorrosion layer. 前記防食層と前記クッション層との間に、さらに遮水シートを有する、請求項４に記載の防食構造体。   The anticorrosion structure according to claim 4, further comprising a water shielding sheet between the anticorrosion layer and the cushion layer.
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