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

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

  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.

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.

JP 2007-39943 A Utility Model Registration No. 3128801

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.

  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.

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.

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.

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.

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.

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.

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 .

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.

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.

  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.

It is a cross-sectional view which shows the anticorrosion structure of the steel sheet pile which concerns on 1st Embodiment of this invention. It is a perspective view which shows the anti-corrosion structure of the said steel sheet pile. It is sectional drawing which expands and shows a part of corrosion prevention structure of the said steel sheet pile. (A), (B) is sectional drawing which shows the construction procedure of the anti-corrosion structure of the said steel sheet pile. (A) is a sectional view showing a reference example, (B) is a sectional view showing a modification of the previous SL embodiment. It is a cross-sectional view which shows the anticorrosion structure of the steel sheet pile which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the anti-corrosion coating body in the said anti-corrosion structure. It is a perspective view which shows the joining structure of the said anti-corrosion coating | covering body. It is a longitudinal cross-sectional view which shows the joining procedure of the said anti-corrosion coating body.

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.

[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.

  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)).

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.

  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.

  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.

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.

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.

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.

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.

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) 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) 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.

[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.

  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. .

  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.

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.

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.

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.

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.

  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)

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. 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. 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. 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. 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 . 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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