JP5180921B2 - Anti-corrosion coating for steel sheet pile and anti-corrosion structure of steel sheet pile - Google Patents

Anti-corrosion coating for steel sheet pile and anti-corrosion structure of steel sheet pile Download PDF

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JP5180921B2
JP5180921B2 JP2009162529A JP2009162529A JP5180921B2 JP 5180921 B2 JP5180921 B2 JP 5180921B2 JP 2009162529 A JP2009162529 A JP 2009162529A JP 2009162529 A JP2009162529 A JP 2009162529A JP 5180921 B2 JP5180921 B2 JP 5180921B2
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steel sheet
sheet pile
anticorrosion
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corrosion
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JP2011017186A (en
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健一郎 今福
和宏 木下
宏司 坂本
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Nippon Steel Corp
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Description

本発明は、鋼矢板用の防食被覆体および鋼矢板の防食構造に関し、詳しくは、海洋構造物や河川構造物などで使用される鋼矢板を被覆するための鋼矢板用の防食被覆体、および鋼矢板の防食構造であって、水中や飛沫帯、干満帯に位置する鋼矢板の超長期防食を目的として樹脂被覆（有機樹脂被覆）を施すとともに、この樹脂被覆の表面をチタン等の高耐食金属板で被覆して防食性能を高めた鋼矢板用の防食被覆体および鋼矢板の防食構造に関する。   The present invention relates to an anticorrosion covering for steel sheet piles and an anticorrosion structure for steel sheet piles, and more specifically, an anticorrosion covering for steel sheet piles for covering steel sheet piles used in offshore structures, river structures, and the like, and This is a steel sheet pile anticorrosion structure, and the resin coating (organic resin coating) is applied for the purpose of ultra-long-term corrosion prevention of steel sheet piles located in the water, splash zone, and tidal zone. The present invention relates to an anticorrosion coating for a steel sheet pile that is coated with a metal plate to enhance the anticorrosion performance, and an anticorrosion structure of the steel sheet pile.

従来、鋼矢板の表面に有機樹脂などで有機防食層を形成し、その表面を耐食性金属薄板で被覆した鋼矢板の防食構造（方法）が利用されている（例えば、特許文献１、２参照）。この防食構造は、耐食性金属薄板で保護層を構成したり、耐食性金属薄板に繊維強化樹脂（ＦＲＰ）や発泡樹脂を加えて保護層を構成したりすることで、有機防食層に対して環境遮断性および耐衝撃性を付与し、これにより鋼矢板の超長期耐久性と高耐衝撃性とを実現しようとするものである。
このような防食構造では、耐食性金属薄板などで被覆体（カバー）を構成するとともに、鋼矢板にボルトを固定しておき、鋼矢板の表面に有機防食層を当接させつつカバーをボルトで固定することで、鋼矢板を防食被覆するように構成されている。 Conventionally, an anticorrosion structure (method) of a steel sheet pile in which an organic anticorrosion layer is formed on the surface of a steel sheet pile with an organic resin or the like and the surface is covered with a corrosion-resistant metal thin plate has been used (for example, see Patent Documents 1 and 2). . This anti-corrosion structure is composed of a corrosion-resistant metal thin plate, or a protective layer is formed by adding fiber reinforced resin (FRP) or foamed resin to the corrosion-resistant metal thin plate, thereby blocking the environment against the organic anti-corrosion layer. It is intended to realize super long-term durability and high impact resistance of steel sheet piles.
In such an anticorrosion structure, the cover (cover) is made of a corrosion-resistant metal thin plate, etc., and the bolt is fixed to the steel sheet pile, and the cover is fixed with the bolt while the organic anticorrosion layer is in contact with the surface of the steel sheet pile. By doing so, the steel sheet pile is configured to be anticorrosive coated.

特開２００７−３９９４３号公報JP 2007-39943 A 実用新案登録第３１２８８０１号公報Utility Model Registration No. 3128801

ところで、鋼矢板は、地盤に貫入する際の打撃力や地盤からの抵抗、あるいは支持する地盤からの土圧や水圧などの作用により、図８(Ａ)に示すように変形することがある。具体的には、ウェブＷおよび一対のフランジＦを有して断面コ字形に形成されたＵ型の鋼矢板Ｙの場合に、ウェブＷとフランジＦとの角度が開くまたは閉じる方向に変形したり、長手方向の軸回りに捻れるように変形したりすると、その表面に沿って固定されたカバーが鋼矢板Ｙの変形に追従できずに、鋼矢板Ｙとカバーとの間に隙間ができてしまう可能性がある。このため、その隙間に水や酸素、腐食性のイオンなどが入って有機防食層を劣化させたり、有機防食層が流出したりして防食耐久性が低下する可能性がある。   By the way, the steel sheet pile may be deformed as shown in FIG. 8 (A) due to the action of striking force when penetrating into the ground, resistance from the ground, earth pressure or water pressure from the supporting ground. Specifically, in the case of a U-shaped steel sheet pile Y having a web W and a pair of flanges F and having a U-shaped cross section, the angle between the web W and the flange F is deformed in an opening or closing direction. If it is deformed to twist about the longitudinal axis, the cover fixed along the surface cannot follow the deformation of the steel sheet pile Y, and there is a gap between the steel sheet pile Y and the cover. There is a possibility. For this reason, water, oxygen, corrosive ions or the like may enter the gap to deteriorate the organic anticorrosion layer, or the organic anticorrosion layer may flow out, thereby reducing the anticorrosion durability.

また、従来の防食構造では、図８(Ｂ)に示すように、Ｕ型の鋼矢板Ｙを水中側の凸側鋼矢板Ｙ１と護岸Ｇ側の凹側鋼矢板Ｙ２とに対称に設置するとともに、これらの継手部に固定したボルトＢによって、凸側カバーＣ１および凹側カバーＣ２を固定する構造となっている。このように各カバーＣ１，Ｃ２の側端部をボルトＢで固定する構造では、凸側カバーＣ１において、鋼矢板Ｙ１のフランジＦに沿った部分が護岸Ｇ側に引っ張られ、凹側カバーＣ２において、鋼矢板Ｙ２のフランジＦに沿った部分が護岸Ｇ側に押され、ウェブＷに沿った各カバーＣ１，Ｃ２の直線部分が水中側に膨らむような変形が生じる可能性がある。このため、前述と同様に、鋼矢板Ｙ１，Ｙ２とカバーＣ１，Ｃ２との隙間に水や酸素、腐食性のイオンなどが入って防食耐久性が低下する可能性がある。   Further, in the conventional anticorrosion structure, as shown in FIG. 8 (B), the U-shaped steel sheet pile Y is installed symmetrically on the underwater side convex steel sheet pile Y1 and the revetment G side concave steel sheet pile Y2. The convex cover C1 and the concave cover C2 are fixed by bolts B fixed to these joint portions. Thus, in the structure which fixes the side edge part of each cover C1, C2 with the volt | bolt B, in the convex side cover C1, the part along the flange F of the steel sheet pile Y1 is pulled to the revetment G side, and in the concave side cover C2, The part along the flange F of the steel sheet pile Y2 is pushed to the revetment G side, and there is a possibility that the straight part of each cover C1, C2 along the web W may be deformed to swell to the underwater side. For this reason, in the same manner as described above, there is a possibility that water, oxygen, corrosive ions, etc. enter the gaps between the steel sheet piles Y1, Y2 and the covers C1, C2 to reduce the corrosion resistance.

また、図８(Ｂ)に示す構造において、特許文献１，２に記載のカバーのように、凹側鋼矢板Ｙ２のウェブＷに沿った位置にて凹側カバーＣ２をボルトで固定する構造も考えられるものの、このような固定構造では、ボルトなどの固定手段の部材数量が増大するとともに、固定作業の手間も増加してしまうという不都合がある。さらに、凸側鋼矢板Ｙ１のウェブＷに沿った凸側カバーＣ１の表面側にボルトなどの固定手段が突出して設けられると、この固定手段に流木などが衝突しやすくなり、その衝撃によってカバーＣ１が変形あるいは破損する可能性があるという不都合もある。   Moreover, in the structure shown to FIG. 8 (B), the structure which fixes the concave side cover C2 with a volt | bolt in the position along the web W of the concave side steel sheet pile Y2 like the cover of patent document 1, 2. Though conceivable, such a fixing structure has an inconvenience that the number of fixing means such as bolts increases and the labor of the fixing operation also increases. Furthermore, when a fixing means such as a bolt protrudes from the surface side of the convex cover C1 along the web W of the convex steel sheet pile Y1, driftwood or the like easily collides with the fixing means, and the impact causes the cover C1. There is also the inconvenience that there is a possibility of deformation or breakage.

本発明の目的は、高耐食金属板によって樹脂防食層を被覆することで超長期耐久性および優れた耐衝撃性等の品質が確保できるとともに、鋼矢板の変形に追従しかつ固定手段の締め付け力による変形を抑制することで、鋼矢板との密着性を確保して防食耐久性を向上させることができる鋼矢板用の防食被覆体および鋼矢板の防食構造を提供することにある。   The purpose of the present invention is to cover the resin anticorrosive layer with a high corrosion resistant metal plate to ensure quality such as ultra-long-term durability and excellent impact resistance, and to follow the deformation of the steel sheet pile and tighten the fixing means It is providing the anti-corrosion coating | coated body for steel sheet piles, and the anti-corrosion structure of steel sheet piles which can ensure the adhesiveness with a steel sheet pile and can improve corrosion prevention durability by suppressing the deformation | transformation by.

本発明の鋼矢板用の防食被覆体は、鋼矢板の表面に当接可能な樹脂防食層と、この樹脂防食層に緩衝材を介して一体化された高耐食金属板と、を少なくとも備える鋼矢板用の防食被覆体であって、当該防食被覆体は、前記鋼矢板の表面に沿う少なくとも２つの直線部と、これらの直線部を結ぶ折曲部とを少なくとも有した断面屈曲状に形成され、前記少なくとも２つの直線部のうちの少なくとも１つの直線部において、前記高耐食金属板は、前記折曲部よりも当該直線部の剛性を大きくする剛性増大手段を有して構成されていることを特徴とする。   The anticorrosion coating for steel sheet piles of the present invention is a steel comprising at least a resin anticorrosion layer capable of contacting the surface of the steel sheet pile, and a high anticorrosion metal plate integrated with the resin anticorrosion layer via a cushioning material. An anticorrosion covering for a sheet pile, wherein the anticorrosion covering is formed in a cross-sectional bent shape having at least two straight portions along the surface of the steel sheet pile, and at least a bent portion connecting these straight portions. In at least one of the at least two straight portions, the highly corrosion-resistant metal plate is configured to include a rigidity increasing means for increasing the rigidity of the straight portion rather than the bent portion. It is characterized by.

以上の本発明によれば、高耐食金属板の直線部に剛性増大手段を設けて折曲部よりも剛性（特に、曲げ剛性）を大きくすることで、前述の図８(Ａ)のように鋼矢板が変形した場合であっても、直線部の変形を抑制しつつ折曲部が曲がることにより鋼矢板の変形に追従することができる。また、防食被覆体を図８(Ｂ)のような固定手段で固定する場合において、鋼矢板のウェブに沿った高耐食金属板の直線部の剛性が大きくされていることで、この直線部が水中側に膨らむような変形を抑制することができる。以上のように、防食被覆体の直線部の変形が抑制できるので、防食被覆体と鋼矢板とが互いに離れて隙間ができることが防止でき、樹脂防食層と鋼矢板との密着性を確保して防食耐久性を向上させることができる。また、防食被覆体の直線部を鋼矢板に固定するボルトなども不要にできることから、部材数量や固定作業手間が低減できるとともに、防食被覆体の表面側へボルトなどが突出せず、流木などの衝突による防食被覆体の変形や破損を回避することができる。   According to the present invention as described above, the rigidity (particularly the bending rigidity) is made larger than the bent portion by providing the rigidity increasing means in the straight portion of the highly corrosion-resistant metal plate, as shown in FIG. Even when the steel sheet pile is deformed, it is possible to follow the deformation of the steel sheet pile by bending the bent portion while suppressing the deformation of the straight portion. Further, in the case where the anticorrosion covering is fixed by the fixing means as shown in FIG. 8B, the linear portion of the high corrosion resistant metal plate along the web of the steel sheet pile is increased in rigidity. Deformation that swells underwater can be suppressed. As described above, since the deformation of the linear portion of the anticorrosion coating can be suppressed, the anticorrosion coating and the steel sheet pile can be prevented from being separated from each other, and the adhesion between the resin anticorrosion layer and the steel sheet pile can be secured. The anticorrosion durability can be improved. In addition, since the bolts that fix the linear part of the anticorrosion coating to the steel sheet pile can be made unnecessary, the number of parts and fixing work can be reduced, and the bolts do not protrude to the surface side of the anticorrosion coating, and driftwood, etc. It is possible to avoid deformation and breakage of the anticorrosion coating due to collision.

この際、本発明の鋼矢板用の防食被覆体では、前記剛性増大手段は、前記高耐食金属板に形成した凹凸で構成されていることが好ましい。
このような構成によれば、高耐食金属板に形成した凹凸によって剛性増大手段を構成することで、別部材を用いて剛性増大手段を構成する場合と比較して、部材数量の増加を抑制することができる。 At this time, in the anticorrosion coating for steel sheet piles of the present invention, it is preferable that the rigidity increasing means is constituted by irregularities formed on the high corrosion resistant metal plate.
According to such a configuration, the increase in the number of members is suppressed by configuring the rigidity increasing means by the unevenness formed on the highly corrosion-resistant metal plate as compared to the case of configuring the rigidity increasing means using another member. be able to.

さらに、本発明の鋼矢板用の防食被覆体では、前記凹凸は、前記直線部において、前記鋼矢板の幅方向に長く形成されるとともに、当該鋼矢板の軸方向に沿って所定間隔で複数設けられていることが好ましい。
このような構成によれば、鋼矢板の幅方向に長く形成した凹凸によって高耐食金属板の直線部の剛性を高めることで、前述の図８(Ｂ)のように直線部が水中側に膨らむような変形を効果的に抑制することができる。 Furthermore, in the anticorrosion covering for a steel sheet pile according to the present invention, the concave and convex portions are formed long in the width direction of the steel sheet pile at the linear portion, and are provided at a predetermined interval along the axial direction of the steel sheet pile. It is preferable that
According to such a configuration, by increasing the rigidity of the straight portion of the highly corrosion-resistant metal plate by the unevenness formed long in the width direction of the steel sheet pile, the straight portion swells to the underwater side as shown in FIG. Such deformation can be effectively suppressed.

また、本発明の鋼矢板用の防食被覆体では、前記剛性増大手段は、前記高耐食金属板の前記緩衝材側の面に固定した補剛部材で構成されていることが好ましい。
このような構成によれば、高耐食金属板に固定した補剛部材によって剛性増大手段を構成することで、剛性を増大させたい適宜な位置に補剛部材を固定することにより、不要な部分に剛性増大手段を付与してしまうことがなく、材料コストや加工コストを抑制することができる。すなわち、高耐食金属板の厚み寸法としては、防食保護層としての必要十分な寸法で設計しておき、剛性を増大させたい直線部にのみ補剛部材を固定することで、高耐食金属板全体が厚くなってしまうことがない。さらに、補剛部材を防食材側に設けるので、この補剛部材が水中側（海側）に突出しないようにでき、水中側が平滑となることから、流木などの衝突による防食被覆体の変形や破損を回避することができる。 In the anticorrosion covering for steel sheet piles of the present invention, it is preferable that the rigidity increasing means is composed of a stiffening member fixed to the surface of the highly corrosion-resistant metal plate on the buffer material side.
According to such a configuration, the rigidity increasing means is configured by the stiffening member fixed to the high corrosion-resistant metal plate, and the stiffening member is fixed at an appropriate position where the rigidity is desired to be increased. There is no provision of rigidity increasing means, and material costs and processing costs can be suppressed. In other words, the thickness dimension of the high corrosion-resistant metal plate is designed with the necessary and sufficient dimensions as the anti-corrosion protection layer, and by fixing the stiffening member only to the straight part where the rigidity is to be increased, the entire high corrosion-resistant metal plate Will not become thicker. Furthermore, since the stiffening member is provided on the anticorrosive material side, the stiffening member can be prevented from projecting to the underwater side (sea side), and the underwater side becomes smooth. Damage can be avoided.

この際、本発明の鋼矢板用の防食被覆体では、前記補剛部材は、前記直線部において、前記鋼矢板の幅方向に長く形成されるとともに、当該鋼矢板の軸方向に沿って所定間隔で複数設けられていることが好ましい。
このような構成によれば、鋼矢板の幅方向に長く形成した補剛部材によって高耐食金属板の直線部の剛性を高めることで、直線部が水中側に膨らむような変形を効果的に抑制することができる。 At this time, in the anticorrosion coating for steel sheet piles of the present invention, the stiffening member is formed long in the width direction of the steel sheet pile in the linear portion, and at a predetermined interval along the axial direction of the steel sheet pile. It is preferable that a plurality are provided.
According to such a configuration, the stiffening member formed long in the width direction of the steel sheet pile enhances the rigidity of the straight portion of the highly corrosion-resistant metal plate, thereby effectively suppressing deformation that causes the straight portion to swell underwater. can do.

さらに、本発明の鋼矢板用の防食被覆体では、前記補剛部材は、前記高耐食金属板と同種の金属板で構成されていることが好ましい。
このような構成によれば、高耐食金属板と同種の金属板で補剛部材を構成することで、異種金属接触による腐食が防止でき、高耐食金属板による防食保護層の長寿命化により防食耐久性を向上させることができる。 Furthermore, in the anticorrosion covering for steel sheet piles of the present invention, it is preferable that the stiffening member is made of the same type of metal plate as the high corrosion resistance metal plate.
According to such a configuration, the stiffening member is made of the same type of metal plate as the highly corrosion-resistant metal plate, so that corrosion due to contact with different metals can be prevented, and the anti-corrosion can be prevented by extending the life of the anti-corrosion protective layer with the high corrosion-resistant metal plate. Durability can be improved.

また、本発明の鋼矢板用の防食被覆体では、前記鋼矢板は、水中側に凸な凸側鋼矢板と地盤側に凹な凹側鋼矢板とを互いの継手部の嵌合により連結して構成され、前記凸側鋼矢板のウェブおよびフランジのうち、少なくともウェブに沿った前記防食被覆体の直線部に前記剛性増大手段が設けられていることが好ましい。
このような構成によれば、凸側鋼矢板のウェブに沿った防食被覆体の直線部に剛性増大手段を設けることで、前述の図８(Ｂ)のように凸側鋼矢板Ｙ１のウェブＷに沿った凸側カバーＣ１の直線部が水中側に変形しようとしても、この変形を効果的に抑制することができる。 Moreover, in the anticorrosion covering for steel sheet piles of the present invention, the steel sheet pile connects a convex steel sheet pile convex on the underwater side and a concave steel sheet pile concave on the ground side by fitting each other joint part. It is preferable that the rigidity increasing means is provided in at least a straight portion of the anticorrosion covering along the web, out of the web and the flange of the convex steel sheet pile.
According to such a configuration, the web W of the convex steel sheet pile Y1 as shown in FIG. 8 (B) is provided by providing the rigidity increasing means in the linear portion of the anticorrosion covering along the web of the convex steel sheet pile. Even if the straight portion of the convex cover C1 along the line is about to be deformed to the underwater side, this deformation can be effectively suppressed.

また、本発明の鋼矢板用の防食被覆体では、前記凹側鋼矢板のウェブおよびフランジに沿った前記防食被覆体の直線部に前記剛性増大手段が設けられていることが好ましい。
このような構成によれば、凹側鋼矢板のウェブおよびフランジに沿った防食被覆体の直線部に剛性増大手段を設けることで、前述の図８(Ｂ)のように凹側鋼矢板Ｙ２のフランジＦに沿った凹側カバーＣ２の直線部が圧縮力を受けても、その変形を抑制することができるとともに、凹側鋼矢板Ｙ２のウェブＷに沿った凹側カバーＣ２の直線部が水中側に変形しようとしても、この変形を効果的に抑制することができる。 Moreover, in the anticorrosion coating | coated body for steel sheet piles of this invention, it is preferable that the said rigidity increasing means is provided in the linear part of the said anticorrosion coating | coated body along the web and flange of the said concave side steel sheet pile.
According to such a configuration, by providing the rigidity increasing means in the linear portion of the anticorrosion covering along the web and flange of the concave steel sheet pile, the concave steel sheet pile Y2 can be formed as shown in FIG. Even if the linear part of the concave cover C2 along the flange F receives a compressive force, the deformation can be suppressed, and the linear part of the concave cover C2 along the web W of the concave steel sheet pile Y2 is underwater. Even if it is going to be deformed to the side, this deformation can be effectively suppressed.

さらに、本発明の鋼矢板用の防食被覆体では、前記高耐食金属板は、チタンまたは耐海水ステンレス鋼から構成されていることが好ましい。
このような構成によれば、高耐食金属板により樹脂防食層を保護することで耐食性を高めることができるとともに、防食被覆体の耐衝撃性も高めることができ、超長期耐久性を確保することができる。 Furthermore, in the anticorrosion coating for steel sheet piles of the present invention, it is preferable that the high corrosion resistant metal plate is made of titanium or seawater resistant stainless steel.
According to such a configuration, it is possible to enhance the corrosion resistance by protecting the resin anticorrosion layer with a high corrosion resistant metal plate, and also to improve the impact resistance of the anticorrosion coating, and to ensure ultra-long-term durability. Can do.

一方、本発明の鋼矢板の防食構造は、前記いずれかの鋼矢板用の防食被覆体によって鋼矢板の表面を被覆したことを特徴とする。
このような発明によれば、地盤に貫入する際の打撃力や地盤からの抵抗、あるいは支持する地盤からの土圧や水圧などの作用により鋼矢板が変形しても、防食被覆体が変形した矢板に追従することができるとともに、前述した防食被覆体と同様に、防食被覆体の変形が抑制できることから、鋼矢板との密着性を確保して防食耐久性を向上させることができる。さらに、防食被覆体の直線部を鋼矢板に固定するボルトなども削減できることから、部材数量や固定作業手間が低減できるとともに、流木などの衝突による防食被覆体の変形や破損を回避して防食耐久性をより一層向上させることができる。 On the other hand, the anticorrosion structure of the steel sheet pile according to the present invention is characterized in that the surface of the steel sheet pile is covered with any one of the above-described anticorrosion coverings for the steel sheet pile.
According to such an invention, even if the steel sheet pile is deformed due to the impact force when penetrating into the ground, the resistance from the ground, or the earth pressure or water pressure from the supporting ground, the anticorrosion covering is deformed. Since it can follow a sheet pile and can suppress a deformation | transformation of an anticorrosion coating body like the anticorrosion coating body mentioned above, adhesiveness with a steel sheet pile can be ensured and corrosion prevention durability can be improved. In addition, the number of bolts that fix the straight part of the anticorrosion coating to the steel sheet pile can be reduced, so the number of parts and fixing work can be reduced, and the anticorrosion coating is prevented from being deformed or damaged by collisions with driftwood. The property can be further improved.

この際、本発明の鋼矢板の防食構造では、前記鋼矢板は、水中側に凸な凸側鋼矢板と地盤側に凹な凹側鋼矢板とを互いの継手部の嵌合により連結して構成され、前記防食被覆体は、前記凸側鋼矢板の表面を覆う凸側防食被覆体と、前記凹側鋼矢板の表面を覆う凹側防食被覆体とを有して構成され、これら凸側および凹側の防食被覆体の側端部が重なって設けられるとともに、前記継手部から水中側に突出する固定手段によって前記鋼矢板に固定されていることが好ましい。
このような構成によれば、鋼矢板の継手部に設けた固定手段によって凸側および凹側の防食被覆体の側端部を固定することで、固定手段の設置箇所数を削減することができ、部材数量や固定作業手間をさらに低減することができる。そして、このような固定手段を用いて凸側および凹側の防食被覆体を固定した場合であっても、前述のように鋼矢板のウェブに沿った防食被覆体の直線部の変形が抑制できることで、鋼矢板との密着性を確保することができる。 At this time, in the steel sheet pile anticorrosion structure of the present invention, the steel sheet pile is formed by connecting a convex steel sheet pile convex on the underwater side and a concave steel sheet pile concave on the ground side by fitting each other joint part. The anticorrosion coating is configured to have a convex anticorrosion coating covering the surface of the convex steel sheet pile and a concave anticorrosion coating covering the surface of the concave steel sheet pile. Further, it is preferable that the side end portions of the anticorrosion covering on the concave side are provided so as to overlap each other and are fixed to the steel sheet pile by a fixing means that protrudes from the joint portion to the underwater side.
According to such a configuration, the number of installation places of the fixing means can be reduced by fixing the side end portions of the convex and concave anticorrosion coverings by the fixing means provided in the joint portion of the steel sheet pile. Further, it is possible to further reduce the number of members and labor for fixing. And even if it is a case where the anticorrosion coating body of a convex side and a concave side is fixed using such a fixing means, deformation | transformation of the linear part of the anticorrosion coating body along the web of a steel sheet pile can be suppressed as mentioned above. Thus, adhesion with the steel sheet pile can be ensured.

以上のような本発明の鋼矢板用の防食被覆体および鋼矢板の防食構造によれば、高耐食金属板によって樹脂防食層を被覆することで超長期耐久性および優れた耐衝撃性等の品質が確保できる。そして、地盤に貫入する際の打撃力や地盤からの抵抗、あるいは支持する地盤からの土圧や水圧などの作用により鋼矢板が変形しても、防食被覆体が変形した矢板に追従することができるとともに、防食被覆体の直線部の変形を抑制して鋼矢板との密着性を確保し、防食耐久性を向上させることができる。さらに、防食被覆体と鋼矢板との固定手段の設置箇所数が削減できることで、部材数量や固定作業手間を低減して低コスト化を図ることができるとともに、防食被覆体の表面側に固定手段が突出しないようにできることから、流木などの衝突による防食被覆体の変形や破損を回避して防食耐久性をより一層向上させることができる。   According to the anti-corrosion coating for steel sheet piles and the anti-corrosion structure of steel sheet piles of the present invention as described above, quality such as ultra-long-term durability and excellent impact resistance can be obtained by coating the resin anti-corrosion layer with a high corrosion-resistant metal plate. Can be secured. And even if the steel sheet pile deforms due to the impact force when penetrating into the ground, resistance from the ground, or earth pressure or water pressure from the supporting ground, the anticorrosion covering can follow the deformed sheet pile In addition, it is possible to suppress the deformation of the linear portion of the anticorrosion covering body and ensure adhesion with the steel sheet pile, thereby improving the anticorrosion durability. Furthermore, since the number of installation places of the fixing means between the anticorrosion covering and the steel sheet pile can be reduced, the number of members and fixing work can be reduced, so that the cost can be reduced, and the fixing means on the surface side of the anticorrosion covering can be achieved. Therefore, the anticorrosion durability can be further improved by avoiding deformation and breakage of the anticorrosion covering due to collision of driftwood or the like.

本発明の一実施形態に係る鋼矢板の防食構造を示す横断面図である。It is a cross-sectional view which shows the anticorrosion structure of the steel sheet pile which concerns on one Embodiment of this invention. 前記防食構造を分解して示す横断面図である。It is a cross-sectional view which decomposes | disassembles and shows the said anti-corrosion structure. 前記防食構造における防食被覆体を示す縦断面図である。It is a longitudinal cross-sectional view which shows the anti-corrosion coating body in the said anti-corrosion structure. 前記防食被覆体の高耐食金属板を示す斜視図である。It is a perspective view which shows the highly corrosion-resistant metal plate of the said anti-corrosion coating body. 前記防食被覆体の他の高耐食金属板を示す斜視図である。It is a perspective view which shows the other highly corrosion-resistant metal plate of the said anti-corrosion coating | coated body. 前記高耐食金属板の変形例を示す斜視図である。It is a perspective view which shows the modification of the said highly corrosion-resistant metal plate. 前記防食被覆体の他の形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the other form of the said anti-corrosion coating | coated body. 従来の鋼矢板および防食構造を示す断面図である。It is sectional drawing which shows the conventional steel sheet pile and anticorrosion structure.

以下、本発明の実施形態を図面に基づいて説明する。
なお、第２実施形態以降において、次の第１実施形態で説明する構成部材と同じ構成部材、および同様な機能を有する構成部材には、第１実施形態の構成部材と同じ符号を付し、それらの説明を省略または簡略化する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the second and subsequent embodiments, the same constituent members as those described in the first embodiment and the constituent members having the same functions are denoted by the same reference numerals as those in the first embodiment. Those descriptions are omitted or simplified.

図１および図２において、本実施形態の鋼矢板の防食構造１は、例えば、海洋構造物としての護岸Ｇを支持する鋼矢板２の海Ｓ側表面を被覆する防食被覆体３を用いるものであって、鋼矢板２は、それぞれＵ形の凸側鋼矢板２Ａおよび凹側鋼矢板２Ｂで構成され、防食被覆体３は、凸側鋼矢板２Ａの海Ｓ側を覆う凸側防食被覆体３Ａと、凹側鋼矢板２Ｂの海Ｓ側を覆う凹側防食被覆体３Ｂで構成されている。凸側鋼矢板２Ａは、海Ｓ側に設けられるウェブ２１と、このウェブ２１の両側に連続する一対のフランジ２２と、フランジ２２先端の継手部２３とを備えて形成され、凹側鋼矢板２Ｂは、護岸Ｇ側に設けられるウェブ２４と、このウェブ２４の両側に連続する一対のフランジ２５と、フランジ２５先端の継手部２６とを備えて形成されている。そして、凸側鋼矢板２Ａおよび凹側鋼矢板２Ｂは、互いの継手部２３，２６同士を嵌合させつつ海中の地盤に貫入されて連結されており、このように連続する鋼矢板２によって護岸Ｇの支持壁体が構成されている。   1 and 2, a steel sheet pile anticorrosion structure 1 according to this embodiment uses, for example, an anticorrosion coating 3 that covers the sea S side surface of a steel sheet pile 2 that supports a seawall G as an offshore structure. The steel sheet pile 2 is composed of a U-shaped convex steel sheet pile 2A and a concave steel sheet pile 2B, and the anticorrosion coating 3 is a convex anticorrosion coating 3A that covers the sea S side of the convex steel sheet pile 2A. And a concave side anticorrosion covering 3B that covers the sea S side of the concave side steel sheet pile 2B. The convex steel sheet pile 2A is formed by including a web 21 provided on the sea S side, a pair of flanges 22 continuous on both sides of the web 21, and a joint portion 23 at the distal end of the flange 22, and a concave steel sheet pile 2B. Is formed of a web 24 provided on the revetment G side, a pair of flanges 25 continuous on both sides of the web 24, and a joint portion 26 at the tip of the flange 25. And the convex side steel sheet pile 2A and the concave side steel sheet pile 2B are penetrated and connected to the ground in the sea while fitting the mutual joint portions 23 and 26 to each other. A support wall body for G is formed.

〔第１実施形態〕
第１実施形態の防食被覆体３（凸側防食被覆体３Ａおよび凹側防食被覆体３Ｂ）は、鋼矢板２の海Ｓ側表面に当接して設けられる樹脂防食層としてのペトロラタムシート３１と、このペトロラタムシート３１に接着される緩衝材としての発泡樹脂層３２と、この発泡樹脂層３２に接着される高耐食金属板３３とを有し、これらが一体化されて構成されている。ペトロラタムシート３１は、厚さ２〜３mmのシート状に形成され、その鋼矢板２側には所定の粘性を有したペトロラタム樹脂が塗布され、このペトロラタム樹脂を介して鋼矢板２の海Ｓ側表面に密着するように構成されている。発泡樹脂層３２は、厚さ５〜２０mmの板状に形成され、発泡ポリエチレンなどの樹脂材料から構成されている。高耐食金属板３３は、厚さ０．４〜１mmの薄板状に形成され、チタンや耐海水ステンレス鋼（例えばＳＵＳ３１６、ＳＵＳ３１７、ＳＵＳ３１７にＣｕ、Ｎ等を添加して耐孔食性等を改善したステンレス鋼など）の高耐食金属から構成されている。 [First Embodiment]
The anticorrosion coating 3 (the convex side anticorrosion coating 3A and the concave anticorrosion coating 3B) of the first embodiment includes a petrolatum sheet 31 as a resin anticorrosion layer provided in contact with the sea S side surface of the steel sheet pile 2; It has a foamed resin layer 32 as a buffer material to be bonded to the petrolatum sheet 31 and a highly corrosion-resistant metal plate 33 to be bonded to the foamed resin layer 32, and these are integrated. The petrolatum sheet 31 is formed in a sheet shape having a thickness of 2 to 3 mm, and a petrolatum resin having a predetermined viscosity is applied to the steel sheet pile 2 side, and the sea S side surface of the steel sheet pile 2 through the petrolatum resin. It is comprised so that it may closely_contact | adhere. The foamed resin layer 32 is formed in a plate shape having a thickness of 5 to 20 mm and is made of a resin material such as foamed polyethylene. The highly corrosion-resistant metal plate 33 is formed in a thin plate shape having a thickness of 0.4 to 1 mm, and has improved pitting corrosion resistance by adding Cu, N or the like to titanium or seawater-resistant stainless steel (for example, SUS316, SUS317, SUS317). Stainless steel)).

凸側防食被覆体３Ａおよび凹側防食被覆体３Ｂは、それぞれ鋼矢板２において防食対象とする飛沫帯や干満帯の高さに応じた所定の高さ寸法と、凸側鋼矢板２Ａおよび凹側鋼矢板２Ｂの各幅寸法と略同一の幅寸法とを有して形成され、互いの側端部が重なった状態で固定手段４を介して鋼矢板２に固定されることで、左右に交互に連続して鋼矢板２の海Ｓ側表面を被覆するように構成されている。具体的に、凸側防食被覆体３Ａは、凸側鋼矢板２Ａのウェブ２１に沿う凸側第１直線部３４と、フランジ２２に沿う凸側第２直線部３５と、これらの凸側第１直線部３４と凸側第２直線部３５とを結ぶ凸側折曲部３６とを有し、護岸Ｇに開口した断面略コ字状に形成されている。そして、凹側防食被覆体３Ｂは、凹側鋼矢板２Ｂのウェブ２４に沿う凹側第１直線部３７と、フランジ２５に沿う凹側第２直線部３８と、これらの凹側第１直線部３７と凹側第２直線部３８とを結ぶ凹側折曲部３９とを有し、海Ｓ側に開口した断面略コ字状に形成されている。   The convex side anticorrosion coating 3A and the concave side anticorrosion coating 3B are respectively provided with a predetermined height according to the height of the splash zone and the tidal zone as the anticorrosion target in the steel sheet pile 2, and the convex side steel sheet pile 2A and the concave side. The steel sheet pile 2B is formed to have substantially the same width dimension as that of the steel sheet pile 2B, and is fixed to the steel sheet pile 2 via the fixing means 4 in a state where the side end portions overlap each other. It is comprised so that the sea S side surface of the steel sheet pile 2 may be coat | covered continuously. Specifically, the convex-side anticorrosion covering 3A includes a convex-side first linear portion 34 along the web 21 of the convex-side steel sheet pile 2A, a convex-side second linear portion 35 along the flange 22, and these convex-side first portions. It has a convex bent portion 36 that connects the straight portion 34 and the convex second straight portion 35, and is formed in a substantially U-shaped cross section that opens to the revetment G. And the concave side anti-corrosion covering 3B includes a concave first linear portion 37 along the web 24 of the concave steel sheet pile 2B, a concave second linear portion 38 along the flange 25, and these concave first linear portions. 37 and a concave bent portion 39 connecting the concave second straight line portion 38 and a substantially U-shaped cross section that opens to the sea S side.

固定手段４は、凹側鋼矢板２Ｂの継手部２６に溶接固定される固定板４１と、この固定板４１に固定されて海Ｓ側に突出するボルト４２と、このボルト４２が挿通されて凸側防食被覆体３Ａの側端部表面に当接する押え板４３と、ボルト４２に螺合されて押え板４３を介して防食被覆体３を鋼矢板２に向かって締め付けるナット４４とを有して構成されている。このような固定手段４は、凸側防食被覆体３Ａおよび凹側防食被覆体３Ｂの重なり部に各１箇所ずつ設けられている。そして、凸側防食被覆体３Ａの左右の側端部には、高耐食金属板３３のみが外方に折り曲げられた凸側被固定部３Ｃが形成され、この凸側被固定部３Ｃにボルト４２を挿通させる挿通孔３Ｄが所定間隔で上下に並んで複数設けられている。一方、凹側防食被覆体３Ｂの左右の側端部には、ペトロラタムシート３１、発泡樹脂層３２および高耐食金属板３３が外方に折り曲げられた凹側被固定部３Ｅが形成され、この凹側被固定部３Ｅにボルト４２を挿通させる挿通孔３Ｆが所定間隔で上下に並んで複数設けられている。従って、凹側被固定部３Ｅに凸側被固定部３Ｃを重ね、挿通孔３Ｄ，３Ｆにボルト４２を挿通させた状態で、このボルト４２を押え板４３に挿通させるとともに、押え板４３を介してボルト４２にナット４４を螺合して締め付けられることで、凸側防食被覆体３Ａおよび凹側防食被覆体３Ｂが鋼矢板２に固定されるようになっている。   The fixing means 4 includes a fixing plate 41 that is welded and fixed to the joint portion 26 of the concave steel sheet pile 2B, a bolt 42 that is fixed to the fixing plate 41 and protrudes toward the sea S side, and the bolt 42 is inserted and protruded. A holding plate 43 that contacts the surface of the side end portion of the side anticorrosion covering 3A, and a nut 44 that is screwed to the bolt 42 and tightens the anticorrosion covering 3 toward the steel sheet pile 2 via the holding plate 43. It is configured. One such fixing means 4 is provided at each overlapping portion of the convex side anticorrosion covering 3A and the concave side anticorrosion covering 3B. And the convex side fixed part 3C in which only the high corrosion-resistant metal plate 33 is bent outward is formed at the left and right side ends of the convex side anticorrosive covering 3A, and the bolt 42 is attached to the convex side fixed part 3C. A plurality of insertion holes 3 </ b> D through which are inserted are arranged vertically at predetermined intervals. On the other hand, the left and right side end portions of the concave side anticorrosion covering 3B are formed with concave side fixed portions 3E in which the petrolatum sheet 31, the foamed resin layer 32 and the high corrosion resistant metal plate 33 are bent outward. A plurality of insertion holes 3F through which the bolts 42 are inserted into the side fixed portions 3E are provided vertically at predetermined intervals. Accordingly, the convex side fixed part 3C is overlapped with the concave side fixed part 3E, and the bolt 42 is inserted into the presser plate 43 in a state where the bolt 42 is inserted into the insertion holes 3D and 3F. Then, the nuts 44 are screwed onto the bolts 42 and tightened so that the convex side anticorrosion covering 3 </ b> A and the concave side anticorrosion covering 3 </ b> B are fixed to the steel sheet pile 2.

以上の凸側防食被覆体３Ａおよび凹側防食被覆体３Ｂにおいて、高耐食金属板３３には、図３〜図５に示すように、発泡樹脂層３２側に凹んだ凹部３３１が複数形成され、これら複数の凹部３３１による凹凸によって剛性増大手段が構成されている。具体的に、複数の凹部３３１は、凸側防食被覆体３Ａにおける凸側第１直線部３４および凸側第２直線部３５の高耐食金属板３３と、凹側防食被覆体３Ｂにおける凹側第１直線部３７および凹側第２直線部３８の高耐食金属板３３に形成され、鋼矢板２の幅方向（左右方向）に長く形成されるとともに、鋼矢板２の軸方向（上下方向）に沿って所定間隔で設けられている。このような凹部３３１を形成することで、各直線部３４，３５，３７，３８の幅方向に沿った曲げ剛性を増大させることができ、その剛性増大効果によって凸側第１直線部３４や凸側第２直線部３５、凹側第１直線部３７、凹側第２直線部３８が海Ｓ側や護岸Ｇ側に撓むような変形が抑制できるようになっている。   In the above-mentioned convex side anticorrosion coating 3A and concave side anticorrosion coating 3B, the highly corrosion-resistant metal plate 33 is formed with a plurality of recesses 331 recessed on the foamed resin layer 32 side, as shown in FIGS. The unevenness due to the plurality of recesses 331 constitutes rigidity increasing means. Specifically, the plurality of recesses 331 are formed of the high-corrosion resistant metal plate 33 of the convex first linear portion 34 and the convex second linear portion 35 in the convex anticorrosion coating 3A, and the concave side of the concave anticorrosion coating 3B. It is formed on the highly corrosion-resistant metal plate 33 of the first straight portion 37 and the concave second straight portion 38, is formed long in the width direction (left-right direction) of the steel sheet pile 2, and in the axial direction (up-down direction) of the steel sheet pile 2. Are provided at predetermined intervals. By forming such a concave portion 331, the bending rigidity along the width direction of each linear portion 34, 35, 37, 38 can be increased, and the convex side first linear portion 34 and the convex portion can be increased by the rigidity increasing effect. The deformation | transformation which the side 2nd straight part 35, the concave 1st straight part 37, and the concave 2nd straight part 38 bend to the sea S side or the revetment G side can be suppressed now.

さらに、各直線部３４，３５，３７，３８に凹部３３１を形成し、これらの曲げ剛性を凸側折曲部３６や凹側折曲部３９の曲げ剛性よりも相対的に大きくしたことで、鋼矢板２が変形した場合に、凸側折曲部３６や凹側折曲部３９がヒンジのように曲がって鋼矢板２の変形に追従できるようになる。これにより、各直線部３４，３５，３７，３８の変形を抑制しつつ、各折曲部３６，３９の曲げによって鋼矢板２の変形に追従することで、凸側防食被覆体３Ａおよび凹側防食被覆体３Ｂと鋼矢板２との乖離が防止でき、ペトロラタムシート３１と鋼矢板２との密着状態が維持できるようにもなっている。従って、防食被覆体３と鋼矢板２とに隙間が形成されることがなく、その隙間に水や酸素、腐食性のイオンなどが入ることが抑制できるので、ペトロラタムシート３１の劣化や流出を防止して防食耐久性を向上させることができる。   Furthermore, by forming a concave portion 331 in each linear portion 34, 35, 37, 38, and making the bending rigidity thereof relatively larger than the bending rigidity of the convex side bending portion 36 or the concave side bending portion 39, When the steel sheet pile 2 is deformed, the convex bent portion 36 and the concave bent portion 39 are bent like a hinge and can follow the deformation of the steel sheet pile 2. Thereby, the convex side anticorrosion covering 3A and the concave side are obtained by following the deformation of the steel sheet pile 2 by bending the bent portions 36 and 39 while suppressing the deformation of the straight portions 34, 35, 37, and 38. Deviation between the anticorrosion coating 3B and the steel sheet pile 2 can be prevented, and the close contact state between the petrolatum sheet 31 and the steel sheet pile 2 can be maintained. Therefore, no gap is formed between the anticorrosion coating 3 and the steel sheet pile 2, and water, oxygen, corrosive ions, etc. can be prevented from entering the gap, thereby preventing deterioration and outflow of the petrolatum sheet 31. Thus, anticorrosion durability can be improved.

なお、本実施形態において、高耐食金属板３３に設ける剛性増大手段としては、凹部３３１に限らず、次の図６に示すような凸部３３２であってもよい。なお、ここでは、凸側防食被覆体３Ａの高耐食金属板３３を例示して説明するが、凹側防食被覆体３Ｂの高耐食金属板３３に同様の凸部３３２を形成してもよい。
すなわち、凸側防食被覆体３Ａにおける凸側第１直線部３４の高耐食金属板３３には、発泡樹脂層３２から離れる側、つまり海Ｓ側に突出した凸部３３２が複数形成されている。これらの凸部３３２は、それぞれ略円形に形成されるとともに、凸側第１直線部３４における幅方向（左右方向）略中央にて上下方向に沿って所定間隔で設けられている。このような凸部３３２を形成することで、凸側第１直線部３４の曲げ剛性を増大させることができ、その剛性増大効果によって凸側第１直線部３４の変形が抑制できるとともに、鋼矢板２の変形に追従してペトロラタムシート３１と鋼矢板２との密着状態が維持できるようになっている。 In the present embodiment, the rigidity increasing means provided on the highly corrosion-resistant metal plate 33 is not limited to the concave portion 331 but may be a convex portion 332 as shown in FIG. In addition, although the high corrosion-resistant metal plate 33 of the convex side anticorrosion coating body 3A is illustrated and described here, the same convex part 332 may be formed on the high corrosion resistance metal plate 33 of the concave side anticorrosion coating body 3B.
That is, a plurality of convex portions 332 protruding to the side away from the foamed resin layer 32, that is, the sea S side, are formed on the highly corrosion-resistant metal plate 33 of the convex first linear portion 34 in the convex side anticorrosive covering 3 </ b> A. Each of the convex portions 332 is formed in a substantially circular shape, and is provided at a predetermined interval along the vertical direction at the approximate center in the width direction (left-right direction) of the convex first linear portion 34. By forming such a convex part 332, the bending rigidity of the convex first linear part 34 can be increased, and the deformation of the convex first linear part 34 can be suppressed by the rigidity increasing effect, and the steel sheet pile Following the deformation of 2, the close contact state between the petrolatum sheet 31 and the steel sheet pile 2 can be maintained.

〔第２実施形態〕
図７(Ａ)〜(Ｄ)は、それぞれ第２実施形態の防食被覆体５の一部を断面して示す縦断面図である。
防食被覆体５は、前記第１実施形態の防食被覆体３（３Ａ，３Ｂ）と同様に、ペトロラタムシート５１と、発泡樹脂層５２と、高耐食金属板５３とを有して構成され、剛性増大手段の構成が第１実施形態と相違している。以下、相違点を詳しく説明する。
防食被覆体５の直線部５４（前記凸側第１直線部３４や凸側第２直線部３５、凹側第１直線部３７、凹側第２直線部３８と同様）において、高耐食金属板５３の発泡樹脂層５２側の面には、剛性増大手段としての補剛部材５３１，５３２，５３３，５３４が固定されている。 [Second Embodiment]
FIGS. 7A to 7D are longitudinal sectional views showing a part of the anticorrosion coating body 5 of the second embodiment.
The anticorrosion coating 5 is configured to include a petrolatum sheet 51, a foamed resin layer 52, and a high anticorrosion metal plate 53, as in the anticorrosion coating 3 (3A, 3B) of the first embodiment. The configuration of the increasing means is different from that of the first embodiment. Hereinafter, the differences will be described in detail.
In the straight line portion 54 (similar to the convex first straight line portion 34, the convex second straight line portion 35, the concave first straight line portion 37, and the concave second straight line portion 38) of the anticorrosion covering 5, a high corrosion resistant metal plate Stiffening members 531, 532, 533, and 534 as rigidity increasing means are fixed to the surface of 53 on the side of the foamed resin layer 52.

図７(Ａ)において、補剛部材５３１は、高耐食金属板５３と同種の高耐食金属から平板状に形成され、その端縁が直線部５４における高耐食金属板５３に溶接固定されている。この補剛部材５３１は、直線部５４の幅方向（左右方向であり、図７の紙面奥行き方向）に長く形成されるとともに、上下方向に沿って所定間隔で設けられている。また、補剛部材５３１の突出寸法は、発泡樹脂層５２の厚さ寸法の略半分に設定されている。
図７(Ｂ)において、補剛部材５３２は、高耐食金属板５３と同種の高耐食金属から断面Ｌ字形のアングル状に形成され、直線部５４における高耐食金属板５３に溶接固定されている。この補剛部材５３２は、直線部５４の幅方向に長く形成されるとともに、上下方向に沿って所定間隔で設けられている。 In FIG. 7A, the stiffening member 531 is formed in a flat plate shape from a high corrosion resistant metal of the same type as the high corrosion resistant metal plate 53, and its edge is welded and fixed to the high corrosion resistant metal plate 53 in the straight portion 54. . The stiffening member 531 is formed long in the width direction of the linear portion 54 (the left-right direction and the depth direction in the drawing of FIG. 7), and is provided at predetermined intervals along the vertical direction. Further, the projecting dimension of the stiffening member 531 is set to approximately half the thickness dimension of the foamed resin layer 52.
In FIG. 7B, the stiffening member 532 is formed in the shape of an L having an L-shaped cross section from the same type of high corrosion resistance metal as the high corrosion resistance metal plate 53, and is welded and fixed to the high corrosion resistance metal plate 53 in the straight portion 54. . The stiffening member 532 is formed long in the width direction of the linear portion 54 and is provided at predetermined intervals along the vertical direction.

図７(Ｃ)において、補剛部材５３３は、補剛部材５３１と略同様に平板状に形成されるものの、上下方向に設けられる間隔が拡げられるとともに、補剛部材５３１よりも突出寸法が大きく形成されている。すなわち、補剛部材５３３の突出寸法は、発泡樹脂層５２の厚さ寸法よりも若干小さく設定され、防食被覆体５を鋼矢板に取り付けた際に、発泡樹脂層５２の弾性変形を阻害しない程度の間隔が補剛部材５３３先端とペトロラタムシート５１との間に形成されている。
図７(Ｄ)において、補剛部材５３４は、高耐食金属板５３と同種の高耐食金属から平板状に形成され、その平面を当接させた状態で直線部５４における高耐食金属板５３に溶接固定されている。この補剛部材５３４は、直線部５４の幅方向に長く形成されるとともに、上下方向に沿って所定間隔で設けられている。 In FIG. 7C, the stiffening member 533 is formed in a flat plate shape in substantially the same manner as the stiffening member 531, but the interval provided in the vertical direction is widened and the protruding dimension is larger than that of the stiffening member 531. Is formed. That is, the protruding dimension of the stiffening member 533 is set to be slightly smaller than the thickness dimension of the foamed resin layer 52, and does not hinder the elastic deformation of the foamed resin layer 52 when the anticorrosion covering 5 is attached to the steel sheet pile. Is formed between the distal end of the stiffening member 533 and the petrolatum sheet 51.
In FIG. 7D, the stiffening member 534 is formed in a flat plate shape from a high corrosion resistant metal of the same type as the high corrosion resistant metal plate 53, and the high corrosion resistant metal plate 53 in the straight portion 54 is in contact with the plane. It is fixed by welding. The stiffening member 534 is formed long in the width direction of the linear portion 54 and is provided at predetermined intervals along the vertical direction.

以上のような防食被覆体５では、直線部５４における高耐食金属板５３に補剛部材５３１，５３２，５３３，５３４を固定することで、直線部５４の曲げ剛性を増大させることができ、その剛性増大効果によって直線部５４の変形が抑制できるとともに、鋼矢板２の変形に追従してペトロラタムシート５１と鋼矢板２との密着状態が維持できるようになっている。従って、防食被覆体５と鋼矢板２とに隙間が形成されることがなく、その隙間に水や酸素、腐食性のイオンなどが入ることが抑制できるので、ペトロラタムシート５１の劣化や流出を防止して防食耐久性を向上させることができる。   In the anticorrosion coating 5 as described above, the bending rigidity of the straight portion 54 can be increased by fixing the stiffening members 531, 532, 533, and 534 to the highly corrosion-resistant metal plate 53 in the straight portion 54. The deformation of the linear portion 54 can be suppressed by the rigidity increasing effect, and the close contact state between the petrolatum sheet 51 and the steel sheet pile 2 can be maintained following the deformation of the steel sheet pile 2. Therefore, no gap is formed between the anticorrosion coating 5 and the steel sheet pile 2, and water, oxygen, corrosive ions, etc. can be prevented from entering the gap, thereby preventing the petrolatum sheet 51 from being deteriorated or discharged. Thus, anticorrosion durability can be improved.

なお、本発明は、前記実施形態に限定されるものではなく、本発明の目的を達成できる他の構成等を含み、以下に示すような変形等も本発明に含まれる。
例えば、前記実施形態においては、Ｕ形の鋼矢板２である凸側鋼矢板２Ａおよび凹側鋼矢板２Ｂを交互に連結した支持壁体の表面を防食被覆体３，５で被覆する構成を説明したが、これに限らず、鋼矢板としては、ハット形鋼矢板であってもよいし、直線状や曲線状の断面を有した鋼矢板であってもよい。ハット形鋼矢板の場合には、その凹凸形状に応じた形状の防食被覆体を用いればよく、前記凸側防食被覆体３Ａや凹側防食被覆体３Ｂの形状には限定されない。また、ハット形鋼矢板の表面を覆う防食被覆体を当該ハット形鋼矢板に固定する固定手段としては、例えば、ハット形鋼矢板の地盤側のフランジや継手部に設けられていればよく、このようにすれば、固定手段が防食被覆体の表面側に突出しないようにでき、流木などによる破損や変形が防止できる。 In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, in the said embodiment, the structure which coat | covers the surface of the support wall body which connected the convex side steel sheet pile 2A and the concave side steel sheet pile 2B which are U-shaped steel sheet piles 2 with the anticorrosion coating bodies 3 and 5 is demonstrated. However, the present invention is not limited to this, and the steel sheet pile may be a hat-shaped steel sheet pile or a steel sheet pile having a linear or curved cross section. In the case of a hat-shaped steel sheet pile, an anticorrosion coating having a shape corresponding to the uneven shape may be used, and the shape of the convex anticorrosion coating 3A or the concave anticorrosion coating 3B is not limited. In addition, as a fixing means for fixing the anticorrosion covering covering the surface of the hat-shaped steel sheet pile to the hat-shaped steel sheet pile, for example, it may be provided on the flange or joint portion on the ground side of the hat-shaped steel sheet pile. By doing so, the fixing means can be prevented from protruding to the surface side of the anticorrosion coating, and damage or deformation due to driftwood or the like can be prevented.

また、前記実施形態では、高耐食金属板３３，５３に凹凸を形成するか、または補剛部材５３１，５３２，５３３，５３４を固定することで剛性増大手段を構成したが、剛性増大手段は前記実施形態のものに限らず、例えば、直線部３４，３５，３７，３８，５４における高耐食金属板３３，５３を折曲部３６，３９よりも厚く形成したり、直線部３４，３５，３７，３８，５４のみ高耐食金属板３３，５３を２重や３重にしたりなどの構成を採用することもできる。さらに、直線部３４，３５，３７，３８，５４における高耐食金属板３３，５３の発泡樹脂層５２側に、例えば、他種の金属からなる金属板を設けたり、繊維強化樹脂層を設けたりして剛性増大手段を構成してもよく、このような構成によっても、直線部３４，３５，３７，３８，５４の剛性を増大させることができ、前記実施形態と略同様の効果を得ることができる。   Moreover, in the said embodiment, although the unevenness | corrugation was formed in the highly corrosion-resistant metal plates 33 and 53, or the rigidity increasing means was comprised by fixing the stiffening members 531, 532, 533, 534, the rigidity increasing means is the said For example, the highly corrosion-resistant metal plates 33 and 53 in the straight portions 34, 35, 37, 38, and 54 are formed thicker than the bent portions 36 and 39, or the straight portions 34, 35, and 37 are formed. , 38, 54 can be configured such that the highly corrosion-resistant metal plates 33, 53 are doubled or tripled. Further, for example, a metal plate made of another type of metal or a fiber reinforced resin layer is provided on the foamed resin layer 52 side of the highly corrosion-resistant metal plates 33 and 53 in the straight portions 34, 35, 37, 38, and 54. Thus, the rigidity increasing means may be configured, and the rigidity of the linear portions 34, 35, 37, 38, 54 can be increased also by such a configuration, and substantially the same effect as the above embodiment can be obtained. Can do.

その他、本発明を実施するための最良の構成、方法などは、以上の記載で開示されているが、本発明は、これに限定されるものではない。すなわち、本発明は、主に特定の実施形態に関して特に図示され、かつ説明されているが、本発明の技術的思想および目的の範囲から逸脱することなく、以上述べた実施形態に対し、形状、材質、数量、その他の詳細な構成において、当業者が様々な変形を加えることができるものである。
従って、上記に開示した形状、材質などを限定した記載は、本発明の理解を容易にするために例示的に記載したものであり、本発明を限定するものではないから、それらの形状、材質などの限定の一部もしくは全部の限定を外した部材の名称での記載は、本発明に含まれるものである。 In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

２…鋼矢板、２Ａ…凸側鋼矢板、２Ｂ…凹側鋼矢板、３，５…防食被覆体、３Ａ…凸側防食被覆体、３Ｂ…凹側防食被覆体、４…固定手段、２１，２４…ウェブ、２２，２５…フランジ、２３，２６…継手部、３１，５１…ペトロラタムシート（樹脂防食層）、３２，５２…発泡樹脂層（緩衝材）、３３，５３…高耐食金属板、３４…凸側第１直線部、３５…凸側第２直線部、３６…凸側折曲部、３７…凹側第１直線部、３８…凹側第２直線部、３９…凹側折曲部、５４…直線部、３３１…凹部、３３２…凸部、５３１，５３２，５３３，５３４…補剛部材。   2 ... Steel sheet pile, 2A ... Convex side steel sheet pile, 2B ... Concave side steel sheet pile, 3, 5 ... Anticorrosion coating, 3A ... Convex side anticorrosion coating, 3B ... Concave side anticorrosion coating, 4 ... Fixing means, 21 24 ... Web, 22, 25 ... Flange, 23, 26 ... Joint part, 31, 51 ... Petrolatum sheet (resin anticorrosive layer), 32, 52 ... Foamed resin layer (buffer material), 33, 53 ... High corrosion resistant metal plate, 34 ... convex side first straight part, 35 ... convex side second straight part, 36 ... convex side bent part, 37 ... concave side first straight part, 38 ... concave side second straight part, 39 ... concave side bent 54, straight line portion, 331, concave portion, 332, convex portion, 531, 532, 533, 534, stiffening member.

Claims (11)

鋼矢板の表面に当接可能な樹脂防食層と、この樹脂防食層に緩衝材を介して一体化された高耐食金属板と、を少なくとも備える鋼矢板用の防食被覆体であって、
当該防食被覆体は、前記鋼矢板の表面に沿う少なくとも２つの直線部と、これらの直線部を結ぶ折曲部とを少なくとも有した断面屈曲状に形成され、
前記少なくとも２つの直線部のうちの少なくとも１つの直線部において、前記高耐食金属板は、前記折曲部よりも当該直線部の剛性を大きくする剛性増大手段を有して構成されていることを特徴とする鋼矢板用の防食被覆体。 An anticorrosion coating for a steel sheet pile comprising at least a resin anticorrosion layer capable of contacting the surface of the steel sheet pile, and a high corrosion resistance metal plate integrated with the resin anticorrosion layer via a buffer material,
The anticorrosion covering is formed in a cross-sectional bent shape having at least two straight portions along the surface of the steel sheet pile, and at least a bent portion connecting these straight portions,
In at least one of the at least two straight portions, the highly corrosion-resistant metal plate is configured to include a rigidity increasing unit that increases the rigidity of the straight portion rather than the bent portion. An anti-corrosion coating for steel sheet piles. 請求項１に記載の鋼矢板用の防食被覆体において、
前記剛性増大手段は、前記高耐食金属板に形成した凹凸で構成されていることを特徴とする鋼矢板用の防食被覆体。 In the anticorrosion coating for steel sheet piles according to claim 1,
The anti-corrosion coating for steel sheet piles, wherein the rigidity increasing means is constituted by irregularities formed on the highly corrosion-resistant metal plate. 請求項２に記載の鋼矢板用の防食被覆体において、
前記凹凸は、前記直線部において、前記鋼矢板の幅方向に長く形成されるとともに、当該鋼矢板の軸方向に沿って所定間隔で複数設けられていることを特徴とする鋼矢板用の防食被覆体。 In the anticorrosion coating for steel sheet piles according to claim 2,
The unevenness is formed in the linear portion so as to be long in the width direction of the steel sheet pile, and a plurality of the unevenness is provided at predetermined intervals along the axial direction of the steel sheet pile. body. 請求項１に記載の鋼矢板用の防食被覆体において、
前記剛性増大手段は、前記高耐食金属板の前記緩衝材側の面に固定した補剛部材で構成されていることを特徴とする鋼矢板用の防食被覆体。 In the anticorrosion coating for steel sheet piles according to claim 1,
The anti-corrosion coating for steel sheet piles, wherein the rigidity increasing means is composed of a stiffening member fixed to a surface of the highly corrosion-resistant metal plate on the buffer material side. 請求項４に記載の鋼矢板用の防食被覆体において、
前記補剛部材は、前記直線部において、前記鋼矢板の幅方向に長く形成されるとともに、当該鋼矢板の軸方向に沿って所定間隔で複数設けられていることを特徴とする鋼矢板用の防食被覆体。 In the anticorrosion coating for steel sheet piles according to claim 4,
The stiffening member is formed long in the width direction of the steel sheet pile in the linear portion, and a plurality of the stiffening members are provided at predetermined intervals along the axial direction of the steel sheet pile. Anticorrosion coating. 請求項４または請求項５に記載の鋼矢板用の防食被覆体において、
前記補剛部材は、前記高耐食金属板と同種の金属板で構成されていることを特徴とする鋼矢板用の防食被覆体。 In the anticorrosion coating for steel sheet piles according to claim 4 or claim 5,
The said stiffening member is comprised with the metal plate of the same kind as the said highly corrosion-resistant metal plate, The anticorrosion coating | coated body for steel sheet piles characterized by the above-mentioned. 請求項１から請求項６のいずれかに記載の鋼矢板用の防食被覆体において、
前記鋼矢板は、水中側に凸な凸側鋼矢板と地盤側に凹な凹側鋼矢板とを互いの継手部の嵌合により連結して構成され、
前記凸側鋼矢板のウェブおよびフランジのうち、少なくともウェブに沿った前記防食被覆体の直線部に前記剛性増大手段が設けられていることを特徴とする鋼矢板用の防食被覆体。 In the anticorrosion coating for steel sheet piles according to any one of claims 1 to 6,
The steel sheet pile is configured by connecting a convex steel sheet pile convex to the underwater side and a concave steel sheet pile concave to the ground side by fitting each other joint part,
Of the web and flange of the convex steel sheet pile, the anti-corrosion coating for steel sheet piles is characterized in that the rigidity increasing means is provided at least in a linear portion of the anti-corrosion coating along the web. 請求項７に記載の鋼矢板用の防食被覆体において、
前記凹側鋼矢板のウェブおよびフランジに沿った前記防食被覆体の直線部に前記剛性増大手段が設けられていることを特徴とする鋼矢板用の防食被覆体。 In the anticorrosion covering for steel sheet piles according to claim 7,
The anticorrosion coating for steel sheet piles, wherein the rigidity increasing means is provided in a linear portion of the anticorrosion coating along the web and flange of the concave steel sheet pile. 請求項１から請求項８のいずれかに記載の鋼矢板用の防食被覆体において、
前記高耐食金属板は、チタンまたは耐海水ステンレス鋼から構成されていることを特徴とする鋼矢板用の防食被覆体。 In the anticorrosion coating for steel sheet piles according to any one of claims 1 to 8,
The high corrosion-resistant metal plate is made of titanium or seawater-resistant stainless steel, and is a corrosion-resistant coating for steel sheet piles. 請求項１から請求項９のいずれかに記載の鋼矢板用の防食被覆体によって鋼矢板の表面を被覆したことを特徴とする鋼矢板の防食構造。   A steel sheet pile anticorrosion structure, wherein the steel sheet pile surface is covered with the anticorrosion coating for steel sheet piles according to any one of claims 1 to 9. 請求項１０に記載の鋼矢板の防食構造において、
前記鋼矢板は、水中側に凸な凸側鋼矢板と地盤側に凹な凹側鋼矢板とを互いの継手部の嵌合により連結して構成され、
前記防食被覆体は、前記凸側鋼矢板の表面を覆う凸側防食被覆体と、前記凹側鋼矢板の表面を覆う凹側防食被覆体とを有して構成され、これら凸側および凹側の防食被覆体の側端部が重なって設けられるとともに、前記継手部から水中側に突出する固定手段によって前記鋼矢板に固定されていることを特徴とする鋼矢板の防食構造。 In the anticorrosion structure of the steel sheet pile according to claim 10,
The steel sheet pile is configured by connecting a convex steel sheet pile convex to the underwater side and a concave steel sheet pile concave to the ground side by fitting each other joint part,
The anticorrosion coating is configured to have a convex anticorrosion coating covering the surface of the convex steel sheet pile and a concave anticorrosion coating covering the surface of the concave steel sheet pile. An anticorrosion structure for a steel sheet pile, characterized in that the side end portions of the anticorrosion coating body are provided in an overlapping manner and are fixed to the steel sheet pile by a fixing means protruding from the joint portion to the underwater side.
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