JP5271785B2 - Steel sheet pile anticorrosion structure and anticorrosion method - Google Patents

Steel sheet pile anticorrosion structure and anticorrosion method Download PDF

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JP5271785B2
JP5271785B2 JP2009102574A JP2009102574A JP5271785B2 JP 5271785 B2 JP5271785 B2 JP 5271785B2 JP 2009102574 A JP2009102574 A JP 2009102574A JP 2009102574 A JP2009102574 A JP 2009102574A JP 5271785 B2 JP5271785 B2 JP 5271785B2
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corrosion
steel sheet
anticorrosion
sheet pile
resistant metal
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JP2010255178A (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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Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrosion-proof structure and a corrosion-proof method for a steel sheet pile, which can secure the quality of super long-run durability, excellent impact resistance, etc. by coating a resin corrosion-proof layer with a highly corrosion-resistant metal plate, which can be easily adapted to the case of a large-sized steel sheet pile or a great coating length, and which can enhance on-site constructibility. <P>SOLUTION: Corrosion-proof covering bodies 3 are connected together by welding and joining the highly corrosion-resistant metal plates 33 adjacent to each other. Thus, even in the cases of the large width dimension or great covering length of the steel sheet pile 2, a continuous corrosion-proof protective layer can be made of the corrosion-proof covering bodies 3 connected to each other. Since the individual corrosion-proof covering bodies 3 do not have to be upsized, the rolling width of the highly corrosion-resistant metal plates 33 does not have to be increased, and cost reduction can be achieved by utilizing existing manufacturing equipment. Additionally, since the size of the corrosion-proof covering body 3 can be suppressed, the operations of transporting and mounting the corrosion-proof covering body 3 can be easily performed, and workability under and on the water can be enhanced. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、鋼矢板の防食構造および防食方法に関し、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の防食構造および方法であって、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有機防食層を施すとともに、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の防食構造および防食方法に関する。   TECHNICAL FIELD The present invention relates to a steel sheet pile anticorrosion structure and a corrosion prevention method, and more particularly, to a steel sheet pile anticorrosion structure and method used in marine structures, river structures, etc., and is located in water, in a splash zone, or in a tidal zone. The present invention relates to an anticorrosion structure and an anticorrosion method for a steel sheet pile in which an organic anticorrosion layer is applied for the purpose of ultra-long-term anticorrosion of a steel sheet pile and the surface of this resin coating is covered with a highly corrosion resistant metal plate such as titanium to enhance the anticorrosion performance.

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、従来の防食構造では、隣り合うカバーの端縁部同士が重ね合わされ、この重ね合わせた部分を貫通するボルトによって、カバーが鋼矢板に固定されるようになっているため、鋼矢板が大型化した場合、例えば、ハット型鋼矢板のように幅寸法が大きくなった場合や、矢板の被覆長が長い場合には、それに伴ってカバー自体を大型化する必要が生じる。しかしながら、耐食性金属板の圧延幅には製造設備の能力上の制限があるため、カバーの大型化にも限界があるとともに、カバーを大型化すると現場(水上や水中)における設置作業性が低下する、あるいは設置が困難になってしまうという不都合も生じる。
ここで、一枚の鋼矢板の途中位置でカバーを分割するとともに、この分割位置に対応して鋼矢板の表面に前記ボルトと同様のボルトを固定しておき、重ね合わせたカバーの端縁部にボルトを貫通させて固定する構造も考えられるものの、以下の不都合が生じる。すなわち、凹凸を有した鋼矢板の表面のうち、水中(水上)側に凸となる表面位置にボルト固定部が突出して設けられるため、このボルト固定部に流木などが衝突しやすくなり、その衝撃によってボルトやカバーが変形あるいは破損してしまう可能性がある。このため、カバーの継手部から内部に水や酸素、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, in the conventional anticorrosion structure, the edge portions of adjacent covers are overlapped with each other, and the cover is fixed to the steel sheet pile by a bolt penetrating the overlapped portion. For example, when the width dimension becomes large like a hat-type steel sheet pile or when the covering length of the sheet pile is long, the cover itself needs to be enlarged accordingly. However, because the rolling width of the corrosion-resistant metal plate is limited by the capacity of the manufacturing equipment, there is a limit to the enlargement of the cover, and when the cover is enlarged, the installation workability at the site (on the water or underwater) is reduced. Or, there is a disadvantage that installation becomes difficult.
Here, the cover is divided at the middle position of one steel sheet pile, and the bolts similar to the bolts are fixed to the surface of the steel sheet pile corresponding to the divided position, and the edge portion of the overlapped cover However, the following inconvenience arises, although a structure in which the bolt is fixed by passing through the bolt can be considered. That is, since the bolt fixing part protrudes from the surface of the steel sheet pile having irregularities and protrudes toward the underwater (water) side, driftwood or the like easily collides with the bolt fixing part, and the impact May cause deformation or breakage of the bolt or cover. For this reason, there is a possibility that water, oxygen, corrosive ions, etc. enter the inside of the joint portion of the cover to deteriorate the organic anticorrosion layer, or the organic anticorrosion layer flows out, thereby reducing the anticorrosion durability.

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、大型の鋼矢板や被覆長が長い場合にも容易に対応でき、かつ現場施工性を向上させることができる鋼矢板の防食構造および防食方法を提供することにある。   The purpose of the present invention is to cover the resin anticorrosion layer with a high corrosion resistant metal plate, thereby ensuring quality such as ultra-long-term durability and excellent impact resistance, and is easy even when a large steel sheet pile or coating length is long. It is providing the anti-corrosion structure and anti-corrosion method of a steel sheet pile which can respond to this, and can improve workability on-site.

本発明の鋼矢板の防食構造は、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、を少なくとも有する防食被覆体を用いた鋼矢板の防食構造であって、前記防食被覆体は、前記鋼矢板の表面に沿って上下、左右または上下左右に互いに隣り合って複数設けられるとともに、当該鋼矢板に固定手段を介して固定され、前記隣り合う防食被覆体における前記高耐食金属板同士が直接または間接的に連続的に溶接接合されることで、当該隣り合う防食被覆体同士が連結され、前記隣り合う防食被覆体のうちの一方における前記高耐食金属板の端縁部には、前記緩衝材側に固定されかつ他方の防食被覆体に向かって突出するとともに、当該高耐食金属板と同種の高耐食金属からなる裏当て板が設けられ、前記隣り合う他方の防食被覆体における前記高耐食金属板が前記一方の防食被覆体に向かって突出して設けられ、この高耐食金属板の突出部と前記裏当て板とが溶接接合されていることを特徴とする。 The anticorrosion structure of the steel sheet pile according to the present invention includes 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. A steel sheet pile anti-corrosion structure using a plurality of the anti-corrosion coatings are provided adjacent to each other vertically and horizontally or vertically and horizontally along the surface of the steel sheet pile, and the steel sheet pile via a fixing means. The adjacent anticorrosion coatings are connected to each other by directly or indirectly continuously welding the highly corrosion-resistant metal plates in the adjacent anticorrosion coatings. The edge portion of the high corrosion-resistant metal plate in one of them is fixed to the buffer material side and protrudes toward the other anti-corrosion coating, and is made of the same type of high corrosion-resistant metal as the high corrosion-resistant metal plate. Backing plate is installed Is, the high corrosion resistant metal plate is provided to protrude toward the anticorrosive coating of the one in the anticorrosion coating of the adjacent other, the projecting portion of the high corrosion-resistant metal plate and said backing plate is welded It is characterized by being.

以上の本発明によれば、樹脂防食層、緩衝材および高耐食金属板が一体化された防食被覆体を形成し、この防食被覆体を固定手段によって鋼矢板に固定するとともに、隣り合う防食被覆体の高耐食金属板同士を連続的に溶接接合して防食被覆体同士を連結することで、鋼矢板の大きさ(幅寸法や高さ寸法)に関わらずに、表面側の高耐食金属板が連続した防食保護層を構成することができる。そして、高耐食金属板同士の溶接接合によって防食被覆体を連結することで、各防食被覆体を大型化しなくてもよくなることから、高耐食金属板の圧延幅も拡大する必要がなく、既存の製造設備を利用して低コスト化を図ることができる。さらに、防食被覆体のサイズを抑制することにより、運搬や取付作業がし易くなるので、例えば、水中や水上において既存の鋼矢板に防食被覆体を取り付ける場合であっても、作業性を向上させることができる。また、高耐食金属板同士を直接または間接的に連続的に溶接接合することで、その表面側にボルトやナットが露出しないようにできることから、流木などの衝突によって接合部が変形したり破損したりすることが回避でき、内部への水等の浸入を防止して防食耐久性を保持することができる。
そして、隣り合う防食被覆体の高耐食金属板が裏当て板を介して溶接接合されることで、互いの高耐食金属板を面一に設置することができ、接合部における表面側をフラットに形成することができる。従って、接合部の凹凸を極力小さくすることで、流木などの衝突による接合部の変形や破損をより確実に回避することができる。また、裏当て板を介して高耐食金属板同士を溶接接合することで、緩衝材や樹脂防食層への溶接熱の入熱を抑制することができ、熱による緩衝材や樹脂防食層の変形や破損を防止することで、超長期の防食耐久性および耐衝撃性を確保することができる。
According to the present invention as described above, the anticorrosion coating body in which the resin anticorrosion layer, the buffer material and the high corrosion resistance metal plate are integrated is formed, and the anticorrosion coating body is fixed to the steel sheet pile by the fixing means, and the adjacent anticorrosion coating is formed. High corrosion-resistant metal sheets on the surface side regardless of the size (width and height dimensions) of the steel sheet pile by connecting the high-corrosion-resistant metal sheets of the body continuously by welding and connecting the anticorrosion coatings. Can constitute a continuous anticorrosion protective layer. And, since it is not necessary to increase the size of each anticorrosion coating by connecting the anticorrosion coatings by welding the high corrosion resistance metal plates, there is no need to increase the rolling width of the high corrosion resistance metal plates. Cost reduction can be achieved by using manufacturing equipment. Furthermore, by suppressing the size of the anticorrosion covering, it becomes easy to carry and attach, so for example, even when the anticorrosion covering is attached to an existing steel sheet pile in water or on the water, the workability is improved. be able to. In addition, by directly and indirectly welding high corrosion resistant metal plates together, bolts and nuts can be prevented from being exposed on the surface side, so the joints can be deformed or damaged by collisions with driftwood, etc. It is possible to prevent the intrusion of water or the like into the interior, and the anticorrosion durability can be maintained.
Then, the high corrosion-resistant metal plates of the adjacent anti-corrosion coatings are welded and joined via the backing plate, so that the high corrosion-resistant metal plates can be installed flush with each other, and the surface side at the joint is flat. Can be formed. Therefore, by making the unevenness of the joint portion as small as possible, deformation or breakage of the joint portion due to collision of driftwood or the like can be avoided more reliably. Also, by welding the highly corrosion-resistant metal plates to each other via the backing plate, it is possible to suppress the heat input of the welding heat to the buffer material and the resin anticorrosion layer, and the deformation of the buffer material and the resin anticorrosion layer due to heat By preventing damage and damage, it is possible to ensure ultra-long corrosion resistance and impact resistance.

さらに、本発明の鋼矢板の防食構造では、前記高耐食金属板同士が抵抗シーム溶接で連続的に接合されていることが好ましい。
このような構成によれば、高耐食金属板同士を連続的にシーム溶接することで溶接部からの水や腐食因子の侵入をより確実に防止することができる。また、抵抗シーム溶接によれば、水中や水上における溶接作業が行えることから、既設の鋼矢板に対して水中や水上で防食被覆体の固定作業を実施することができる。さらに、抵抗シーム溶接によれば、アーク溶接よりも低コストで溶接できるほか、緩衝材や樹脂防食層への入熱を抑制することができる。
Furthermore, in the corrosion prevention structure of the steel sheet pile according to the present invention, it is preferable that the highly corrosion-resistant metal plates are continuously joined to each other by resistance seam welding.
According to such a structure, the penetration | invasion of the water and a corrosion factor from a welding part can be prevented more reliably by carrying out the seam welding of highly corrosion-resistant metal plates continuously. Moreover, according to resistance seam welding, since the welding work can be performed in water or on the water, the anticorrosion coating can be fixed on the existing steel sheet pile in water or on the water. Furthermore, according to resistance seam welding, welding can be performed at a lower cost than arc welding, and heat input to the buffer material and the resin anticorrosion layer can be suppressed.

また、本発明の鋼矢板の防食構造では、前記緩衝材と高耐食金属板との間に繊維強化樹脂層を含んで前記防食被覆体が構成されることが好ましい。
このような構成によれば、緩衝材と高耐食金属板との間に繊維強化樹脂層を設けたことで、防食保護層の強度を高めることができ、防食耐久性および耐衝撃性をさらに向上させることができる。
Moreover, in the corrosion prevention structure of the steel sheet pile of this invention, it is preferable that the said corrosion prevention coating body is comprised including a fiber reinforced resin layer between the said buffer material and a highly corrosion-resistant metal plate.
According to such a configuration, the strength of the anticorrosion protective layer can be increased by providing the fiber reinforced resin layer between the buffer material and the high corrosion resistant metal plate, and the anticorrosion durability and impact resistance are further improved. Can be made.

そして、本発明の鋼矢板の防食構造では、前記高耐食金属板がチタンまたは耐海水ステンレス鋼からなることが好ましい。
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。
And in the corrosion prevention structure of the steel sheet pile of this invention, it is preferable that the said highly corrosion-resistant metal plate consists 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方法は、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、を少なくとも有する防食被覆体を用いた鋼矢板の防食方法であって、上下、左右または上下左右に互いに隣り合う前記防食被覆体における前記高耐食金属板同士を直接または間接的に連続的に溶接接合して連結する手順と、前記防食被覆体を前記鋼矢板の表面に固定手段を介して固定する手順とを有し、前記高耐食金属板同士を連結する手順では、前記隣り合う防食被覆体のうちの一方における前記高耐食金属板の端縁部に、前記緩衝材側に固定されかつ他方の防食被覆体に向かって突出するとともに、当該高耐食金属板と同種の高耐食金属からなる裏当て板を予め設けておき、前記隣り合う他方の防食被覆体における前記高耐食金属板を前記一方の防食被覆体に向かって突出して形成しておき、前記裏当て板と前記他方の高耐食金属板の突出部とを重ね合わせて前記隣り合う防食被覆体を設置してから、当該突出部を裏当て板に連続的に溶接接合して当該防食被覆体同士を連結することを特徴とする。 On the other hand, the anticorrosion method for steel sheet piles of the present invention includes 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 buffer material. A method for preventing corrosion of a steel sheet pile using a covering, in which the highly corrosion-resistant metal plates in the anti-corrosion covering adjacent to each other vertically and horizontally or vertically and horizontally are welded and connected directly or indirectly continuously. A procedure and a procedure of fixing the anticorrosion coating to the surface of the steel sheet pile via a fixing means, and in the procedure of connecting the highly corrosion-resistant metal plates to each other, in one of the adjacent anticorrosion coatings A backing plate made of a high corrosion resistant metal of the same type as the high corrosion resistant metal plate is provided in advance on the edge of the high corrosion resistant metal plate, and is fixed to the buffer material side and protrudes toward the other anticorrosive coating. The other side The high corrosion-resistant metal plate in the anti-corrosion coating is formed so as to protrude toward the one anti-corrosion coating, and the adjacent anti-corrosion by overlapping the backing plate and the protruding portion of the other high corrosion-resistant metal plate. After the covering is installed, the protrusion is continuously welded to the backing plate to connect the anticorrosion coverings together .

以上の本発明によれば、前述した防食構造と同様に、高耐食金属板同士を溶接接合することで、鋼矢板の大きさや要求される被覆長に応じて各防食被覆体を大型化しなくてもよくなることから、既存の製造設備を利用して高耐食金属板を圧延製造することができるとともに、防食被覆体のサイズを抑制することにより、運搬や取付作業などの現場施工性を向上させることができる。また、高耐食金属板同士を溶接接合することで、その表面側をフラットにできることから、流木などの衝突による変形や破損が回避でき、連続的に溶接することで接合部から内部への水等の浸入を防止して防食耐久性を保持することができる。
そして、裏当て板を介して高耐食金属板同士を溶接接合することで、接合部の表面側がフラットに形成でき、流木などの衝突をより確実に回避することができる。また、裏当て板を介することで、緩衝材や樹脂防食層への溶接熱の入熱を抑制することができ、熱による緩衝材や樹脂防食層の変形や破損を防止することで、超長期の防食耐久性および耐衝撃性を確保することができる。
According to the present invention as described above, similarly to the above-described anticorrosion structure, each anticorrosion coating body does not have to be enlarged according to the size of the steel sheet pile or the required coating length by welding and joining the highly corrosion-resistant metal plates together. As a result, it is possible to roll-manufacture highly corrosion-resistant metal plates using existing manufacturing equipment, and to improve on-site workability such as transportation and installation work by suppressing the size of the anticorrosion coating. Can do. Also, since the surface side can be flattened by welding the highly corrosion-resistant metal plates together, deformation and breakage due to collisions such as driftwood can be avoided, and continuous welding, water from the joint to the inside, etc. It is possible to prevent corrosion from entering and maintain corrosion resistance.
Then, by welding the highly corrosion-resistant metal plates together via the backing plate, the surface side of the joint can be formed flat, and collisions such as driftwood can be avoided more reliably. In addition, through the backing plate, it is possible to suppress the heat input of the welding heat to the buffer material and the resin anticorrosion layer, and to prevent deformation and breakage of the buffer material and the resin anticorrosion layer due to heat, The anticorrosion durability and impact resistance can be ensured.

この際、本発明の鋼矢板の防食方法では、前記高耐食金属板同士を水中または水上にて抵抗シーム溶接で接合することが好ましい。
このような構成によれば、水中または水上(例えば、海水中や海面上)における溶接作業が行えることから、既設の鋼矢板に対して水中または水上で防食被覆体の固定作業を実施することができるとともに、アーク溶接よりも低コストで溶接できるほか、緩衝材や樹脂防食層への入熱を抑制することができる。
Under the present circumstances, in the corrosion prevention method of the steel sheet pile of this invention, it is preferable to join the said highly corrosion-resistant metal plates to each other by resistance seam welding in water or on water.
According to such a configuration, since the welding work can be performed in water or on the water (for example, in seawater or on the sea surface), the anticorrosion coating can be fixed to the existing steel sheet pile in water or on the water. In addition to being able to perform welding at a lower cost than arc welding, it is possible to suppress heat input to the buffer material and the resin anticorrosion layer.

以上のような本発明の鋼矢板の防食構造および防食方法によれば、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とともに、大型の鋼矢板や被覆長が長い場合にも容易に対応でき、かつ現場施工性を向上させることができる。   According to the anticorrosion structure and anticorrosion method of the steel sheet pile of the present invention as described above, it is possible to ensure the quality such as super long-term durability and excellent impact resistance by covering the resin anticorrosion layer with a high corrosion resistant metal plate, Even when a large steel sheet pile or covering length is long, it can be easily dealt with and on-site workability can be improved.

本発明の第1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 1st Embodiment of this invention. 前記鋼矢板の防食構造を示す斜視図である。It is a perspective view which shows the anti-corrosion structure of the said steel sheet pile. 前記鋼矢板の防食構造の一部を拡大して示す断面図である。It is sectional drawing which expands and shows a part of corrosion prevention structure of the said steel sheet pile. (A),(B)は、前記鋼矢板の防食構造の施工手順を示す断面図である。(A), (B) is sectional drawing which shows the construction procedure of the anti-corrosion structure of the said steel sheet pile. (A)は参考例を示す断面図、(B)は前記実施形態の変形例を示す断面図である。(A) is a sectional view showing a reference example, (B) is a sectional view showing a modification of the previous SL embodiment. 本発明の第2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 2nd Embodiment of this invention. 前記防食構造における防食被覆体を示す斜視図である。It is a perspective view which shows the anti-corrosion coating body in the said anti-corrosion structure. 前記防食被覆体の接合構造を示す斜視図である。It is a perspective view which shows the joining structure of the said anti-corrosion coating | covering body. 前記防食被覆体の接合手順を示す縦断面図である。It is a longitudinal cross-sectional view which shows the joining procedure of the said anti-corrosion coating body.

以下、本発明の各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, each embodiment 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.

〔第1実施形態〕
図1〜図3において、第1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、本実施形態の鋼矢板2は、海S側に凸に設けられる第1ウェブ21と、護岸G側に凹に設けられる一対の第2ウェブ22と、これらを連結する一対のフランジ23と、第2ウェブ22先端の継手部24と、を備えたハット形鋼矢板で構成されている。鋼矢板2は、海中の地盤に貫入されるとともに、隣り合う他の鋼矢板2と継手部24同士を嵌合させることで連結されており、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。
[First Embodiment]
1 to 3, a steel sheet pile anticorrosion structure 1 according to the first 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. And the steel sheet pile 2 of this embodiment is the 1st web 21 provided in a convex by the sea S side, a pair of 2nd web 22 provided in a recess by the revetment G side, and a pair of flange which connects these 23 and the joint part 24 of the 2nd web 22 front-end | tip, It is comprised with the hat-shaped steel sheet pile. The steel sheet pile 2 is penetrated into the ground in the sea and is connected by fitting the joint portions 24 with other steel sheet piles 2 adjacent to each other, and thus supporting the revetment G by the continuous steel sheet pile 2. A wall is constructed.

防食被覆体3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。   The anticorrosion covering 3 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, a foamed resin layer 32 as a buffer material adhered to the petrolatum sheet 31, and this foaming It has a highly corrosion-resistant metal plate 33 bonded to the 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)).

このような防食被覆体3は、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幅寸法とを有して形成され、このように分割して形成された個々の防食被覆体3が鋼矢板2に固定されるとともに、左右に隣り合う防食被覆体3同士が海中において連結されることで、左右に連続して鋼矢板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、防食被覆体3は、鋼矢板2の第1ウェブ21の略半分に沿う突状部34とフランジ23に沿う傾斜部35とが連続した断面屈曲状の部分と、隣り合う2枚の鋼矢板2に跨って設置されて第2ウェブ22および継手部24に沿う後退部36とを有する。そして、防食被覆体3は、鋼矢板2の第2ウェブ22に左右一対の固定手段4を介して後退部36および傾斜部35の端部が固定されるとともに、左右に隣り合う防食被覆体3の突状部34の側端縁同士が第1ウェブ21の略中央に位置する接合部5で縦方向に接合され、左右に連結されるようになっている。 Such an anti-corrosion coating 3 is formed having a predetermined height and width according to the height of the splash zone and tidal zone that are subject to anti-corrosion in the steel sheet pile 2, and is divided in this way. The formed anticorrosion coating 3 is fixed to the steel sheet pile 2 and the anticorrosion coatings 3 adjacent to each other on the left and right are connected in the sea so that the surface of the steel sheet pile 2 on the sea S side is continuously connected to the left and right. It is comprised so that it may coat | cover. Specifically, anti-corrosion coating body 3, a cross section bent like portion an inclined portion 35 along the projecting portion 34 and the flange 23 are continuous along approximately half of the first web 21 of the steel sheet pile 2, adjacent 2 Like that of the installed across the steel sheet pile 2 to have a second web 22 and the retraction portion 36 along the joint portion 24. And the anticorrosion coating | coated body 3 is fixed to the 2nd web 22 of the steel sheet pile 2 through the pair of right and left fixing means 4, and the edge part of the retreat part 36 and the inclination part 35 is fixed, and the anticorrosion coating | coated body 3 adjacent to right and left is adjoined. The side edges of the protruding portion 34 are joined in the longitudinal direction at the joining portion 5 located substantially at the center of the first web 21 and are connected to the left and right.

固定手段4は、鋼矢板2の第2ウェブ22の海S側表面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が挿通されて防食被覆体3の後退部36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、隣り合う鋼矢板2の第2ウェブ22に各1箇所ずつに設けられており、防食被覆体3の後退部36の左右2箇所には、ボルト42を挿通させる挿通孔が所定間隔で上下に並んで複数設けられている。従って、防食被覆体3は、その傾斜部35に近接した位置における後退部36の左右両端部がナット44および押え板43によって締め付けられることで、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 sea S side surface of the second web 22 of the steel sheet pile 2, a bolt 42 that is fixed to the fixing plate 41 and protrudes to the sea S side, and the bolt 42 is A holding plate 43 that is inserted and abuts against the surface of the receding portion 36 of the anticorrosion coating 3 and a nut 44 that is screwed into the bolt 42 and tightens the anticorrosion coating 3 toward the steel sheet pile 2 via the holding plate 43. Configured. Such a fixing means 4 is provided at one location on each of the second webs 22 of the adjacent steel sheet piles 2, and is inserted through two bolts 42 on the left and right sides of the receding portion 36 of the anticorrosion coating 3. A plurality of holes are provided side by side at predetermined intervals. Accordingly, the anticorrosion covering 3 is fixed to the steel sheet pile 2 by tightening the left and right end portions of the retracted portion 36 at the position close to the inclined portion 35 with the nut 44 and the presser plate 43.

接合部5は、図3に示すように、左右に隣り合う防食被覆体3の高耐食金属板33同士が裏当て板51を介して間接的に溶接接合されることで、当該隣り合う一方(図3中、右側)の防食被覆体3Aと他方(図3中、左側)の防食被覆体3Bとが連結される構造となっている。具体的には、一方の防食被覆体3Aにおいて、高耐食金属板33の端縁部の発泡樹脂層32側に裏当て板51が連続的に溶接固定され、この裏当て板51は、その幅寸法の略半分の突出量だけ他方の防食被覆体3Bに向かって突出して設けられている。そして、裏当て板51は、防食被覆体3の高耐食金属板33と同種の高耐食金属から形成され、高耐食金属板33と同程度の厚さ寸法、または高耐食金属板33よりも厚く形成されている。また、一方の防食被覆体3Aにおける発泡樹脂層32およびペトロラタムシート31は、裏当て板51の突出方向先端位置まで延びて形成されている。また、他方の防食被覆体3Bにおいて、高耐食金属板33の端縁部には、一方の防食被覆体3Aに向かって突出する突出部33Aが形成され、この突出部33Aは、裏当て板51の海S側表面に沿って設けられ、裏当て板51に連続的に溶接固定されている。   As shown in FIG. 3, the joining portion 5 is formed by indirectly welding and joining the highly corrosion-resistant metal plates 33 of the anticorrosion coating 3 adjacent to the left and right via a backing plate 51. The anticorrosion coating 3A on the right side in FIG. 3 is connected to the anticorrosion coating 3B on the other side (left side in FIG. 3). Specifically, in one anticorrosion covering 3A, a backing plate 51 is continuously welded and fixed to the foamed resin layer 32 side of the edge portion of the high corrosion resistant metal plate 33, and the backing plate 51 has a width thereof. It is provided so as to protrude toward the other anticorrosion coating 3B by a protruding amount that is approximately half the size. The backing plate 51 is formed of the same type of high corrosion resistant metal as the high corrosion resistant metal plate 33 of the anticorrosion coating 3 and is thicker than the high corrosion resistant metal plate 33 or thicker than the high corrosion resistant metal plate 33. Is formed. Further, the foamed resin layer 32 and the petrolatum sheet 31 in the one anticorrosion covering 3 </ b> A are formed to extend to the front end position in the protruding direction of the backing plate 51. Further, in the other anti-corrosion coating 3B, a protruding portion 33A protruding toward the one anti-corrosion coating 3A is formed at the edge portion of the highly corrosion-resistant metal plate 33, and the protruding portion 33A is the backing plate 51. Are provided along the surface of the sea S side, and are continuously welded and fixed to the backing plate 51.

以上のような一方および他方の防食被覆体3A,3B同士の接合手順について、図4も参照して説明する。
ここで、高耐食金属板33と裏当て板51とを接合する溶接方法としては、Tig溶接や抵抗シーム溶接、レーザー溶接などが使用できるが、ここでは海中における抵抗シーム溶接が用いられている。
先ず、図4(A)に示すように、一方の防食被覆体3Aを鋼矢板2に前記固定手段4で固定してから、他方の防食被覆体3Bを鋼矢板2に設置する。この際、一方および他方の防食被覆体3A,3Bの発泡樹脂層32およびペトロラタムシート31同士を互いに当接させるとともに、他方の防食被覆体3Bにおける高耐食金属板33の突出部33Aを一方の防食被覆体3Aの裏当て板51に重ね、一方および他方の高耐食金属板33同士がフラット(面一)になるように位置決めする。そして、他方の防食被覆体3Bにおける後退部36を固定手段4で鋼矢板2に固定する。
A procedure for joining the one and the other anticorrosion coatings 3A and 3B as described above will be described with reference to FIG.
Here, as a welding method for joining the highly corrosion-resistant metal plate 33 and the backing plate 51, Tig welding, resistance seam welding, laser welding, or the like can be used. Here, resistance seam welding in the sea is used.
First, as shown in FIG. 4 (A), one anticorrosion coating 3A is fixed to the steel sheet pile 2 by the fixing means 4, and then the other anticorrosion coating 3B is installed on the steel sheet pile 2. At this time, the foamed resin layer 32 and the petrolatum sheet 31 of the one and the other anticorrosion coatings 3A and 3B are brought into contact with each other, and the protruding portion 33A of the high corrosion resistance metal plate 33 in the other anticorrosion coating 3B It is placed on the backing plate 51 of the covering 3A and positioned so that one and the other highly corrosion-resistant metal plates 33 are flat (on the same plane). And the retreat part 36 in the other anti-corrosion coating 3B is fixed to the steel sheet pile 2 by the fixing means 4.

次に、図4(B)に示すように、一方の防食被覆体3Aの高耐食金属板33表面に銅板52を適宜な接着剤や粘着テープなどで仮止めしてから、溶接装置の溶接側電極輪W1を他方の防食被覆体3Bにおける高耐食金属板33の突出部33A表面に設置し、アース側電極輪W2を一方の防食被覆体3Aにおける銅板52表面に設置する。次いで、溶接装置を上方から下方または下方から上方に移動させ、突出部33Aを裏当て板51に連続的に溶接接合する。この後、溶接装置を外してから仮止めした銅板52を取り外して、一方および他方の防食被覆体3A,3Bの連結が完了する。
そして、以上のような接合手順を繰り返すことで、左右に連続する防食被覆体3同士が一体に連結され、鋼矢板2からなる護岸Gの支持壁体の海S側表面が防食被覆体3によって覆われるようになっている。
Next, as shown in FIG. 4B, the copper plate 52 is temporarily fixed to the surface of the high corrosion resistant metal plate 33 of one anticorrosion coating 3A with an appropriate adhesive or adhesive tape, and then the welding side of the welding apparatus. The electrode ring W1 is installed on the surface of the protruding portion 33A of the highly corrosion-resistant metal plate 33 in the other anticorrosion coating 3B, and the ground side electrode ring W2 is installed on the surface of the copper plate 52 in the one anticorrosion coating 3A. Next, the welding apparatus is moved from the upper side to the lower side or from the lower side to the upper side, and the protruding portion 33A is continuously welded to the backing plate 51. Thereafter, the temporarily secured copper plate 52 is removed after the welding device is removed, and the connection of one and the other anticorrosion coatings 3A and 3B is completed.
Then, by repeating the bonding procedure described above, anti-corrosion coating body 3 between consecutive to the left and right are connected together, sea S side surface corrosion protection coating body 3 of the supporting wall of the seawall G made of steel sheet pile 2 It is supposed to be covered by.

なお、本実施形態において、防食被覆体3同士の接合構造は、前記接合部5に限らず、以下の図5に示す接合部5Bのような構造であってもよい。
5(A)に示す接合部5Aは、本発明に含まれない参考例であり、前記接合部5のような裏当て板51を用いず、他方の防食被覆体3Bにおける高耐食金属板33の突出部33Aを、一方の防食被覆体3Aの高耐食金属板33の表面に直接溶接するものである。この場合には、一方の防食被覆体3Aの高耐食金属板33の表面に図示しない銅板を仮付けしておき、前記溶接側電極輪W1を突出部33Aの表面に設置し、アース側電極輪W2を銅板表面に設置した状態で、突出部33Aを一方の高耐食金属板33に溶接接合すればよい。
In the present embodiment, the bonding structure between the anticorrosion coatings 3 is not limited to the bonding portion 5 and may be a structure such as a bonding portion 5B shown in FIG.
Junction 5A shown in FIG. 5 (A) is a reference example not included in the present invention, without using a backing plate 51, such as the joint 5, high corrosion resistance metal plate 33 in the other anticorrosion covering body 3B The protruding portion 33A is directly welded to the surface of the highly corrosion-resistant metal plate 33 of the one anticorrosion coating 3A. In this case, a copper plate (not shown) is temporarily attached to the surface of the highly corrosion-resistant metal plate 33 of the one anticorrosion coating 3A, the welding side electrode ring W1 is installed on the surface of the protruding portion 33A, and the ground side electrode ring What is necessary is just to weld-join the protrusion part 33A to one high corrosion-resistant metal plate 33 in the state which installed W2 on the copper plate surface.

一方、図5(B)に示す接合部5Bは、防食被覆体3が発泡樹脂層32と高耐食金属板33との間に繊維強化樹脂層(FRP層)37を含んで構成された場合のものである。ここで、一方の防食被覆体3Aにおいて、繊維強化樹脂層37は、高耐食金属板33よりも短く形成されて裏当て板51の端部に当接する位置で止まっており、発泡樹脂層32およびペトロラタムシート31は、裏当て板51の突出方向先端位置まで延びて形成されている。また、他方の防食被覆体3Bにおいて、繊維強化樹脂層37は、発泡樹脂層32およびペトロラタムシート31と同様に突出部33Aよりも後退して設けられ、裏当て板51の突出方向先端に当接するようになっている。この接合部5Bにおける高耐食金属板33同士の溶接接合の手順は、前記接合部5の接合手順と同様である。 On the other hand , the joint portion 5B shown in FIG. 5B is a case where the anticorrosion covering 3 includes a fiber reinforced resin layer (FRP layer) 37 between the foamed resin layer 32 and the highly corrosion resistant metal plate 33. Is. Here, in one anticorrosion covering 3A, the fiber reinforced resin layer 37 is formed shorter than the high corrosion resistant metal plate 33 and stops at a position where it abuts against the end of the backing plate 51, and the foamed resin layer 32 and The petrolatum sheet 31 is formed to extend to the front end position of the backing plate 51 in the protruding direction. Further, in the other anticorrosion covering 3B, the fiber reinforced resin layer 37 is provided so as to recede from the protruding portion 33A similarly to the foamed resin layer 32 and the petrolatum sheet 31, and abuts against the front end of the backing plate 51 in the protruding direction. It is like that. The procedure for welding and joining the highly corrosion-resistant metal plates 33 in the joint 5B is the same as the procedure for joining the joint 5.

以上の本実施形態によれば、以下の効果が得られる。
(1)すなわち、隣り合う高耐食金属板33同士を溶接接合して防食被覆体3同士を連結することで、ハット形鋼矢板のように鋼矢板2の幅寸法が大きい場合であっても、互いに連結した防食被覆体3によって連続した防食保護層を構成することができ、個々の防食被覆体3を大型化しなくてもよくなることから、高耐食金属板33の圧延幅も拡大する必要がなく、既存の製造設備を利用して低コスト化を図ることができる。また、防食被覆体3のサイズが抑制できるので、その運搬や取付作業がし易くなり、水中や水上において既存の鋼矢板2に防食被覆体3を取り付ける場合の作業性を向上させることができる。
According to the above embodiment, the following effects can be obtained.
(1) That is, even if it is a case where the width dimension of the steel sheet pile 2 is large like a hat-shaped steel sheet pile by joining the high corrosion-resistant metal plates 33 adjacent to each other and connecting the anticorrosion coverings 3 to each other, A continuous anticorrosion protective layer can be constituted by the anticorrosion coatings 3 connected to each other, and it is not necessary to enlarge the individual anticorrosion coatings 3, so that it is not necessary to increase the rolling width of the high corrosion resistant metal plate 33. Cost reduction can be achieved by using existing manufacturing equipment. Moreover, since the size of the anti-corrosion covering 3 can be suppressed, it is easy to carry and attach the anti-corrosion covering 3, and the workability when attaching the anti-corrosion covering 3 to the existing steel sheet pile 2 in water or on water can be improved.

(2)さらに、高耐食金属板33同士を裏当て板51を介して溶接接合することで、その表面側にボルトやナットなどが露出せず、連結した防食被覆体3の突状部34表面をフラットに形成することができることから、流木などの衝突によって接合部5,5A,5Bが変形したり破損したりすることが回避でき、防食被覆体3と鋼矢板2との間への水等の浸入を防止して防食耐久性を保持することができる。また、裏当て板51を介して高耐食金属板33同士を溶接接合することで、発泡樹脂層32やペトロラタムシート31への溶接熱の入熱を抑制することができ、熱による、発泡樹脂層32やペトロラタムシート31の変形や破損を防止することで、超長期の防食耐久性および耐衝撃性を確保することができる。 (2) Further, by welding the high corrosion resistant metal plates 33 to each other via the backing plate 51, the surface of the protruding portion 34 of the connected anticorrosion coating 3 without exposing bolts or nuts on the surface side. Can be formed flat, so that the joints 5, 5 </ b> A, 5 </ b> B can be prevented from being deformed or damaged due to a collision with driftwood or the like, and water between the anticorrosion coating 3 and the steel sheet pile 2 can be avoided. It is possible to prevent corrosion from entering and maintain corrosion resistance. Moreover, the heat input of the welding heat to the foamed resin layer 32 and the petrolatum sheet 31 can be suppressed by welding the highly corrosion-resistant metal plates 33 to each other via the backing plate 51, and the foamed resin layer due to heat By preventing the deformation and breakage of the 32 and the petrolatum sheet 31, it is possible to ensure ultra-long anticorrosion durability and impact resistance.

(3)高耐食金属板33同士を抵抗シーム溶接で接合することで、水中や水上における溶接作業が行えることから、既設の鋼矢板2に対して水中や水上で防食被覆体3の固定作業を実施することができるとともに、アーク溶接などよりも低コストで溶接できるほか、発泡樹脂層32やペトロラタムシート31への入熱を確実に抑制することができる。 (3) Since the welding work in water or on the water can be performed by joining the highly corrosion-resistant metal plates 33 to each other by resistance seam welding, the work for fixing the anti-corrosion coating 3 to the existing steel sheet pile 2 in water or on the water is performed. In addition to being able to perform welding, it is possible to perform welding at a lower cost than arc welding, and it is possible to reliably suppress heat input to the foamed resin layer 32 and the petrolatum sheet 31.

〔第2実施形態〕
図6において、第2実施形態の防食構造1Aは、前記第1実施形態と異なり、U形の鋼矢板6(凸側鋼矢板6Aおよび凹側鋼矢板6B)の海S側表面を防食被覆体7(凸側防食被覆体7Aおよび凹側防食被覆体7B)で被覆する構造となっている。凸側鋼矢板6Aは、海S側に設けられるウェブ61と、このウェブ61の両側に連続する一対のフランジ62と、フランジ62先端の継手部63とを備えて形成され、凹側鋼矢板6Bは、護岸G側に設けられるウェブ64と、このウェブ64の両側に連続する一対のフランジ65と、フランジ65先端の継手部66とを備えて形成され、凸側鋼矢板6Aおよび凹側鋼矢板6Bは、互いの継手部63,66同士を嵌合させることで連結されている。防食被覆体7は、前記第1実施形態の防食被覆体3と同様に、ペトロラタムシート71と、発泡樹脂層72と、高耐食金属板73とを有して構成されている。
[Second Embodiment]
In FIG. 6, the anticorrosion structure 1 </ b> A of the second embodiment differs from the first embodiment in that the U-shaped steel sheet pile 6 (the convex side steel sheet pile 6 </ b> A and the concave side steel sheet pile 6 </ b> B) has an anticorrosive coating on the sea S side surface. 7 (convex anticorrosion coating 7A and concave anticorrosion coating 7B). The convex steel sheet pile 6A is formed by including a web 61 provided on the sea S side, a pair of flanges 62 continuous on both sides of the web 61, and a joint portion 63 at the tip of the flange 62, and the concave steel sheet pile 6B. Is formed by including a web 64 provided on the revetment G side, a pair of flanges 65 continuous on both sides of the web 64, and a joint portion 66 at the tip of the flange 65, and a convex steel sheet pile 6A and a concave steel sheet pile. 6B is connected by fitting the joint portions 63 and 66 to each other. Similarly to the anticorrosion coating 3 of the first embodiment, the anticorrosion coating 7 includes a petrolatum sheet 71, a foamed resin layer 72, and a high corrosion resistance metal plate 73.

凸側防食被覆体7Aは、凸側鋼矢板6Aの幅と略同一の幅寸法とを有して形成され、凸側鋼矢板6Aのウェブ61に沿う突状部74と、フランジ62に沿う傾斜部75とを有して護岸Gに開口した断面略コ字状に形成されている。凹側防食被覆体7Bは、凹側鋼矢板6Bの幅と略同一の幅寸法とを有して形成され、凹側鋼矢板6Bのウェブ64に沿う後退部76と、フランジ65に沿う傾斜部77とを有して海S側に開口した断面略コ字状に形成されている。これらの防食被覆体7は、前記第1実施形態と略同様の固定手段4を介して鋼矢板6に固定されており、固定手段4の固定板41およびボルト42は、凹側鋼矢板6Bの継手部66に連続的に溶接固定されて海S側に突出して設けられている。そして、凹側防食被覆体7Bの傾斜部77端縁に設けた挿通孔に固定手段4のボルト42を挿通させるとともに、さらに海S側から凸側防食被覆体7Aを重ね、その傾斜部75端縁に設けた挿通孔にボルト42を挿通させ、押え板43を介して防食被覆体7を鋼矢板6に向かってナット44で締め付けることで、防食被覆体7が固定されるようになっている。   The convex-side anticorrosion covering 7A is formed to have a width dimension substantially the same as the width of the convex-side steel sheet pile 6A, and a slope 74 along the protrusions 74 along the web 61 of the convex-side steel sheet pile 6A. The section 75 is formed in a substantially U-shaped cross section that is open to the revetment G. The concave-side anticorrosion coating 7B is formed to have a width dimension substantially the same as the width of the concave-side steel sheet pile 6B, and a receding portion 76 along the web 64 of the concave-side steel sheet pile 6B and an inclined portion along the flange 65. 77 and is formed in a substantially U-shaped cross section opened to the sea S side. These anticorrosion coating bodies 7 are fixed to the steel sheet pile 6 through the fixing means 4 substantially the same as in the first embodiment, and the fixing plate 41 and the bolt 42 of the fixing means 4 are the same as those of the concave steel sheet pile 6B. It is continuously welded and fixed to the joint portion 66 and is provided to project to the sea S side. And while inserting the volt | bolt 42 of the fixing means 4 in the insertion hole provided in the inclined part 77 edge of the concave side anti-corrosion coating body 7B, the convex side anti-corrosion coating body 7A is further piled up from the sea S side, and the inclination part 75 end The anti-corrosion coating 7 is fixed by inserting the bolt 42 into the insertion hole provided at the edge and tightening the anti-corrosion coating 7 with the nut 44 toward the steel sheet pile 6 via the presser plate 43. .

以上の防食被覆体7は、図7に示すように、それぞれ所定の高さ寸法を有して形成され、つまり上下に複数個の分割されており、上下に隣り合う防食被覆体7同士が接合部8で横方向に接合され、上下に連結されるようになっている。なお、ここでは、防食被覆体7のうちの凸側防食被覆体7Aを図示して説明するが、凹側防食被覆体7Bも同様に、接合部8によって上下に連結されるようになっている。接合部8は、上下に隣り合う防食被覆体7の高耐食金属板73同士が裏当て板81を介して間接的に溶接接合されることで、当該隣り合う一方(図中、上側)の防食被覆体7Cと他方(図中、下側)の防食被覆体7Dとが連結される構造となっている。具体的には、図8および図9に示すように、一方の防食被覆体7Cにおいて、高耐食金属板73の下端縁部の発泡樹脂層72側に裏当て板81が連続的に溶接固定され、この裏当て板81は、その幅寸法の略半分の突出量だけ他方の防食被覆体7Dに向かって突出して設けられている。また、他方の防食被覆体7Dにおいて、高耐食金属板73の端縁部には、一方の防食被覆体7Cに向かって突出する突出部73Aが形成され、この突出部73Aは、裏当て板81の海S側表面に沿って設けられ、裏当て板81に連続的に溶接固定されるようになっている。   As shown in FIG. 7, the above-described anticorrosion coating 7 is formed with a predetermined height dimension, that is, a plurality of upper and lower anticorrosion coatings 7 are joined together. It is joined in the horizontal direction at the portion 8 and is connected vertically. In addition, although the convex side anticorrosion coating body 7A of the anticorrosion coating body 7 is illustrated and described here, the concave side anticorrosion coating body 7B is similarly connected vertically by the joint portion 8. . The joining portion 8 is formed by indirectly welding the highly corrosion-resistant metal plates 73 of the anticorrosion coatings 7 adjacent to each other through the backing plate 81, so that the adjacent one (upper side in the figure) is anticorrosive. 7C and the other (lower side in the figure) anticorrosion coating 7D are connected to each other. Specifically, as shown in FIGS. 8 and 9, the backing plate 81 is continuously welded and fixed to the foamed resin layer 72 side of the lower end edge portion of the highly corrosion-resistant metal plate 73 in one anticorrosion coating 7 </ b> C. The backing plate 81 is provided so as to protrude toward the other anticorrosion coating 7D by a protruding amount that is approximately half of the width dimension. Further, in the other anti-corrosion coating 7D, a protruding portion 73A protruding toward the one anti-corrosion coating 7C is formed at the edge portion of the highly corrosion-resistant metal plate 73. The protruding portion 73A is a backing plate 81. It is provided along the surface of the sea S side, and is continuously welded and fixed to the backing plate 81.

本実施形態における上下の防食被覆体7同士の接合手順、および裏当て板81を介した高耐食金属板73同士の溶接方法としては、前記第1実施形態と略同様に水中や水上で高耐食金属板73同士を抵抗シーム溶接する手順が採用可能である。さらに、本実施形態においては、陸上で防食被覆体7の高耐食金属板73同士を抵抗シーム溶接し、上下の防食被覆体7同士を連結してから、この連結した防食被覆体7を水中や水上に運搬し、鋼矢板6に固定手段4で固定するような取付手順が採用可能である。
以上の本実施形態によれば、前記第1実施形態と同様に、個々の防食被覆体7を大型化しなくてもよくなることから、高耐食金属板73の圧延幅も拡大する必要がなく、既存の製造設備を利用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7のサイズが抑制できるので、その運搬や取付作業がし易くなり、水中または水上における運搬や取付作業の作業性を向上させることができる。
As a joining procedure between the upper and lower anticorrosion coatings 7 in this embodiment and a welding method between the highly corrosion-resistant metal plates 73 via the backing plate 81, high corrosion resistance in water or on water is substantially the same as in the first embodiment. A procedure for resistance seam welding between the metal plates 73 can be employed. Furthermore, in the present embodiment, the high corrosion resistant metal plates 73 of the anticorrosion coating 7 are resistance seam welded on the land, and the upper and lower anticorrosion coatings 7 are connected to each other. It is possible to adopt an attachment procedure such as transporting to the water and fixing to the steel sheet pile 6 by the fixing means 4.
According to the present embodiment described above, as in the first embodiment, since it is not necessary to increase the size of the individual anticorrosion coating bodies 7, it is not necessary to increase the rolling width of the high corrosion resistant metal plate 73, and the existing The manufacturing equipment can be used to reduce costs and the size of the anticorrosion coating 7 can be reduced, so that it is easy to carry and install, and the workability of carrying and installing in water or on the water is improved. 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、左右に隣り合う防食被覆体3同士を連結する防食構造と、上下に隣り合う防食被覆体7同士を連結する防食構造とを説明したが、本発明の防食構造は、防食被覆体を上下左右に隣り合わせて連結したものであってもよい。
また、前記実施形態では、凹凸形状の断面を有する鋼矢板2,6の表面を防食被覆体3,7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、直線状や曲線状の断面を有したものであってもよく、この場合には、防食被覆体としても鋼矢板の表面形状に応じた形状を有して構成されていればよい。
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, although the anti-corrosion structure which connects the anti-corrosion coating bodies 3 adjacent on right and left, and the anti-corrosion structure which connects the anti-corrosion coating bodies 7 adjacent on the upper and lower sides were demonstrated, the anti-corrosion structure of this invention is The anticorrosion covering may be connected side by side vertically and horizontally.
Moreover, although the said embodiment demonstrated the structure which coat | covers the surface of the steel sheet piles 2 and 6 which have an uneven | corrugated shaped cross section with the anticorrosion coating bodies 3 and 7, as a steel sheet pile, not only this but a linear form or a curve In this case, the anticorrosion covering may have a shape corresponding to the surface shape of the steel sheet pile.

また、前記実施形態では、高耐食金属板33,73同士を抵抗シーム溶接によって溶接接合する構成を説明したが、高耐食金属板33,73同士の接合方法としては、Tig溶接やレーザー溶接などを用いてもよい
また、前記実施形態では、防食被覆体3,7を鋼矢板2,6に固定する固定手段4として、ボルト42やナット44を用いたが、固定手段としては、前記実施形態で説明したものに限らず、係合や嵌合によって防食被覆体を鋼矢板に固定する構成など、任意の構成が採用可能である。
なお、鋼矢板2,6と防食被覆体3,7との電気的接触による異種金属接触腐食を防止するため、押え板43にFRP等の絶縁性の材料を用いるか、あるいはボルト42を絶縁性のスリーブで被覆する等の対策を講じることが好ましい。
Moreover, although the said embodiment demonstrated the structure which weld-joins the highly corrosion-resistant metal plates 33 and 73 by resistance seam welding, as a joining method of the highly corrosion-resistant metal plates 33 and 73, Tig welding, laser welding, etc. are carried out. It may be used .
Moreover, in the said embodiment, although the bolt 42 and the nut 44 were used as the fixing means 4 which fixes the anti-corrosion coating | covering bodies 3 and 7 to the steel sheet piles 2 and 6, as what was demonstrated in the said embodiment as a fixing means. Not limited to this, any configuration such as a configuration in which the anticorrosion covering is fixed to the steel sheet pile by engagement or fitting can be employed.
In order to prevent different metal contact corrosion due to electrical contact between the steel sheet piles 2 and 6 and the anticorrosion coatings 3 and 7, an insulating material such as FRP is used for the press plate 43, or the bolt 42 is insulated. It is preferable to take measures such as covering with a sleeve.

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 is included in this invention.

2,6…鋼矢板、3,7…防食被覆体、4…固定手段、5,5A,5B,8…接合部、31,71…ペトロラタムシート(樹脂防食層)、32,72…発泡樹脂層(緩衝材)、33,73…高耐食金属板、33A,73A…突出部、37…繊維強化樹脂層、51,81…裏当て板。   DESCRIPTION OF SYMBOLS 2,6 ... Steel sheet pile, 3,7 ... Corrosion-proof coating body, 4 ... Fixing means, 5,5A, 5B, 8 ... Junction part, 71,71 ... Petrolatum sheet (resin anticorrosion layer), 32,72 ... Foamed resin layer (Buffer material), 33, 73: highly corrosion-resistant metal plate, 33A, 73A ... projecting portion, 37 ... fiber reinforced resin layer, 51, 81 ... backing plate.

Claims (6)

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、を少なくとも有する防食被覆体を用いた鋼矢板の防食構造であって、
前記防食被覆体は、前記鋼矢板の表面に沿って上下、左右または上下左右に互いに隣り合って複数設けられるとともに、当該鋼矢板に固定手段を介して固定され、
前記隣り合う防食被覆体における前記高耐食金属板同士が直接または間接的に連続的に溶接接合されることで、当該隣り合う防食被覆体同士が連結され
前記隣り合う防食被覆体のうちの一方における前記高耐食金属板の端縁部には、前記緩衝材側に固定されかつ他方の防食被覆体に向かって突出するとともに、当該高耐食金属板と同種の高耐食金属からなる裏当て板が設けられ、
前記隣り合う他方の防食被覆体における前記高耐食金属板が前記一方の防食被覆体に向かって突出して設けられ、この高耐食金属板の突出部と前記裏当て板とが溶接接合されていることを特徴とする鋼矢板の防食構造。
A steel sheet pile anti-corrosion structure using an anti-corrosion coating having at least a resin anti-corrosion layer capable of contacting the surface of the steel sheet pile and a highly anti-corrosion metal plate integrated with the resin anti-corrosion layer via a cushioning material. And
A plurality of the anticorrosion coverings are provided adjacent to each other vertically and horizontally or vertically and horizontally along the surface of the steel sheet pile, and are fixed to the steel sheet pile via fixing means,
The adjacent anticorrosion coatings are connected together by directly or indirectly continuously welding the high corrosion resistance metal plates in the adjacent anticorrosion coatings ,
The edge of the highly corrosion-resistant metal plate in one of the adjacent corrosion-resistant coatings is fixed to the buffer material side and protrudes toward the other corrosion-resistant coating, and is the same type as the high corrosion-resistant metal plate A backing plate made of high corrosion-resistant metal is provided,
The highly corrosion-resistant metal plate in the other adjacent anti-corrosion coating is provided to protrude toward the one anti-corrosion coating, and the protruding portion of the high corrosion-resistant metal plate and the backing plate are welded and joined. Corrosion-proof structure of steel sheet piles.
請求項1に記載の鋼矢板の防食構造において、
前記高耐食金属板同士が抵抗シーム溶接で連続的に接合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 1 ,
The steel sheet pile anticorrosion structure, wherein the high corrosion resistant metal plates are continuously joined by resistance seam welding.
請求項1または請求項2に記載の鋼矢板の防食構造において、
前記緩衝材と高耐食金属板との間に繊維強化樹脂層を含んで前記防食被覆体が構成され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 1 or 2 ,
An anticorrosion structure for steel sheet piles, characterized in that the anticorrosion covering is constituted by including a fiber reinforced resin layer between the buffer material and the high corrosion resistant metal plate.
請求項1から請求項のいずれかに記載の鋼矢板の防食構造において、
前記高耐食金属板がチタンまたは耐海水ステンレス鋼からな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 any one of claims 1 to 3 ,
The steel sheet pile anticorrosion structure, wherein the high corrosion resistant metal plate is made of titanium or seawater resistant stainless steel.
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、を少なくとも有する防食被覆体を用いた鋼矢板の防食方法であって、
上下、左右または上下左右に互いに隣り合う前記防食被覆体における前記高耐食金属板同士を直接または間接的に連続的に溶接接合して連結する手順と、前記防食被覆体を前記鋼矢板の表面に固定手段を介して固定する手順とを有し、
前記高耐食金属板同士を連結する手順では、
前記隣り合う防食被覆体のうちの一方における前記高耐食金属板の端縁部に、前記緩衝材側に固定されかつ他方の防食被覆体に向かって突出するとともに、当該高耐食金属板と同種の高耐食金属からなる裏当て板を予め設けておき、
前記隣り合う他方の防食被覆体における前記高耐食金属板を前記一方の防食被覆体に向かって突出して形成しておき、
前記裏当て板と前記他方の高耐食金属板の突出部とを重ね合わせて前記隣り合う防食被覆体を設置してから、当該突出部を裏当て板に連続的に溶接接合して当該防食被覆体同士を連結することを特徴とする鋼矢板の防食方法。
A steel sheet pile anticorrosion method using an anticorrosion coating comprising at least a resin anticorrosion layer capable of contacting the surface of the steel sheet pile and a highly corrosion resistant metal plate integrated with the resin anticorrosion layer via a buffer material. And
Steps for connecting the high corrosion-resistant metal plates in the anti-corrosion coating adjacent to each other vertically and horizontally or vertically and horizontally, directly or indirectly by continuous welding, and connecting the anti-corrosion coating to the surface of the steel sheet pile Fixing via a fixing means ,
In the procedure of connecting the highly corrosion-resistant metal plates to each other,
The edge of the highly corrosion-resistant metal plate in one of the adjacent anti-corrosion coatings is fixed to the buffer material side and protrudes toward the other anti-corrosion coating, and is the same type as the high corrosion-resistant metal plate A backing plate made of a highly corrosion-resistant metal is provided in advance,
The high corrosion-resistant metal plate in the other adjacent anti-corrosion coating is formed to protrude toward the one anti-corrosion coating,
After the backing plate and the protruding portion of the other high corrosion-resistant metal plate are overlapped to install the adjacent anticorrosion coating body, the protruding portion is continuously welded and joined to the backing plate. An anticorrosion method for steel sheet piles, characterized by connecting bodies .
請求項に記載の鋼矢板の防食方法において、
前記高耐食金属板同士を水中または水上にて抵抗シーム溶接で接合することを特徴とする鋼矢板の防食方法。
In the corrosion prevention method of the steel sheet pile according to claim 5 ,
An anticorrosion method for steel sheet piles, characterized in that the highly corrosion-resistant metal plates are joined together by resistance seam welding in water or on water.
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