JP6687792B1 - Anticorrosion structure of steel pipe sheet pile and press plate material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anticorrosion structure of a steel pipe sheet pile, which has excellent adhesion of an anticorrosion layer to an irregular surface of a steel pipe sheet pile, and can effectively corrode the irregular surface, and a pressing plate material usable for the anticorrosion structure. SOLUTION: A fixing means 20 arranged in a groove portion 32 of a steel pipe sheet pile 3 for pressing and fixing the anticorrosion main body portion 10 to the steel pipe sheet pile 3 side includes a pressing plate member 21 in contact with the surface of the anticorrosion main body portion 10, a bolt 22, and The nut 23 is included. The pair of bent portions 210 on both sides of the pressing plate member 21 are overlapped with the anticorrosion main body portion 10 installed on the outer peripheral surface 1a of the steel pipe main body 1, and the portion 211 of the pressing plate member 21 sandwiched between the pair of bent portion 210 is The bolts 22 are pierced and pressed toward the joint 2 side, and are stacked on the anticorrosion main body 10 installed on the outer surface 2 a of the joint 2. When the nut 23 is removed from the bolt 22 and the pressing state of the pressing plate member 21 is released, the portion 211 bends in the direction away from the joint 2 due to springback. [Selection diagram] Figure 2

Description

  TECHNICAL FIELD The present invention relates to an anticorrosion structure for preventing the corrugated surface of a steel pipe sheet pile and a pressing plate material used therefor.

  Structures installed in breakwaters, quays, piers, piers, and other ports, rivers, lakes, etc. are generally used for a long period of time in an environment exposed to seawater or river water, so some kind of anticorrosion treatment is generally applied. is there. For example, the anticorrosion method for steel pipe sheet piles used for offshore and harbor structures installed in the marine environment includes cathodic protection mainly for the midsea area and seabed soil area, and mainly for the sea atmosphere area, splash zone, There is covered corrosion protection for the tidal zone and the middle of the sea. As a method for coating corrosion protection, a method is known in which a corrosion protection layer containing a corrosion protection material is provided on the surface of a steel pipe sheet pile, and the surface of the corrosion protection layer is further covered with a protective cover.

  The steel pipe sheet pile typically has a structure in which a plurality of steel pipe main bodies are connected via a joint, and the surface of the steel pipe sheet pile that is the object of corrosion protection corresponds to the ridges and the joint corresponding to the steel pipe main body. It has unevenness composed of a groove. When the uneven surface of such a steel pipe sheet pile is covered with an anticorrosion layer, and the surface of the anticorrosion layer is further covered with a protective cover, conventionally, as a protective cover, a main body portion for covering the surface of the ridge and the main body portion are used. A method of using a flange-shaped protective cover having a flange portion extending from the groove portion side to the groove portion side and arranging a plurality of the flange-shaped protective covers in the connecting direction of the steel pipe main body is adopted. In this method, the flange portions of two adjacent protective covers are overlapped with each other in the groove portion of the steel pipe sheet pile, and the flat plate-shaped fixing plate is brought into contact with the overlapping portion of the flange portions, and in this state, the fixing plates are overlapped with each other. Often fixed to the joint with bolts and nuts along with the parts. And in this case, the protective plate adheres to the anticorrosion layer only after pressing the entire overlapping portion of the flange portions of the protective cover to the joint side with a uniform force, and further, the anticorrosion layer has the anticorrosion target surface. It adheres to the surface of the steel pipe sheet pile.

  However, in the method of fixing the protective cover using the flat plate-shaped fixing plate, only the widthwise central portion of the groove portion of the fixing plate is tightened with the bolt and the nut, so that only the tightened portion is pressed toward the joint side. Other portions, for example, both side portions along the longitudinal direction of the groove portion of the fixing plate, warp back to the side opposite to the joint side, and as a result, there is a problem that the protective cover does not adhere to the anticorrosion layer and rises. In order to solve this problem, in the anticorrosion structure described in Patent Document 1, the protective cover has a structure in which a main body cover portion that covers the outer peripheral surface of the steel pipe main body and a bottom cover portion are continuous in the connecting direction of the steel pipe main body, A flat plate-shaped pressing member is arranged on the surface of the bottom cover part, and by tightening these with bolts and nuts to integrate them, a tension along the width direction of the groove part is given to the pressing member, whereby the anticorrosion layer Improves adhesion to the anticorrosion surface.

JP2012-224994A

  The technique described in Patent Document 1 can bring the anticorrosion layer into close contact with the uneven surface of the steel pipe sheet pile, but there is room for improvement in terms of workability and the like because the structure for that is relatively complicated. Although it has a relatively simple structure, no technique has yet been provided for bringing the anticorrosion layer into close contact with the uneven surface.

An object of the present invention is to provide an anticorrosion structure for a steel pipe sheet pile, which has excellent adhesion of the anticorrosion layer to the uneven surface of the steel pipe sheet pile and which can effectively prevent corrosion on the uneven surface.
Moreover, the subject of this invention is providing the pressing board material which can make an anticorrosion layer adhere to the uneven | corrugated surface of a steel pipe sheet pile.

  The present invention has a structure in which a plurality of steel pipe main bodies are connected via a joint, and has unevenness composed of a ridge portion corresponding to the steel pipe main body and a groove portion corresponding to the joint on the surface, the surface of the steel pipe sheet pile A corrosion protection structure for a steel pipe sheet pile, which is arranged in the groove and a corrosion protection main body portion including an anticorrosion layer that contacts the surface of the steel pipe sheet pile, and presses and fixes the corrosion protection main body portion to the steel pipe sheet pile side. And a fixing plate member that comes into contact with the surface of the anticorrosion main body portion, a bolt protruding from the outer surface of the joint, and a nut screwed with the bolt, wherein the bolt is The nut penetrates the anticorrosion main body portion and the pressing plate member, and the nut is screwed to a protruding portion of the bolt from the surface of the pressing plate member, so that the pressing plate member is pressed toward the joint side, and The main body is the front of the steel pipe sheet pile. And the pressing plate member has a first direction corresponding to the width direction of the groove and a second direction orthogonal to the first direction, and the two steel pipes adjacent to each other with the groove interposed therebetween. A pair of both side portions extending from one side to the other of the main body and extending along the second direction of the pressing plate member are bent to the front surface side of the pressing plate member to form a bending part, and the pair of bending parts are The bolt penetrates a portion of the pressing plate member that is sandwiched between the pair of the bent portions that are overlapped with the anticorrosion main body portion that is installed on the outer peripheral surface of each of the two steel pipe main bodies that are adjacent to each other across the groove portion. And is pressed to the joint side by the nut screwed to the bolt, and is stacked on the anticorrosion main body portion installed on the outer surface of the joint. When releasing the pressing state of the pressing plate, presser portion sandwiched between a pair of the bent portions of the plate member is curved in a direction away from the joint by a spring-back, which is corrosion structure of the steel pipe sheet pile.

  Further, the present invention has a structure in which a plurality of steel pipe main bodies are connected via a joint, and has unevenness consisting of a ridge portion corresponding to the steel pipe main body and a groove portion corresponding to the joint on the surface, the steel pipe sheet pile On the surface, when installing an anticorrosion structure including an anticorrosion layer, the pressing plate material, which is arranged in the groove portion and presses and fixes the anticorrosion structure on the steel pipe sheet pile side, corresponding to the width direction of the groove portion. A pair of both side portions having one direction and a second direction orthogonal to the first direction and extending along the second direction are bent to one surface side of the pressing plate material to form bent portions, which are natural. In the state, the portion sandwiched by the pair of bent portions is a curved portion that is convexly curved to the one surface side, and the bending portion presses the curved portion to the opposite side to the one surface side. It deforms into a flat shape by doing, and when the pressure is released, the original curve Back to state a retainer plate.

  ADVANTAGE OF THE INVENTION According to this invention, the corrosion-resistant structure of the steel pipe sheet pile which is excellent in the adhesiveness of the anticorrosion layer with respect to the uneven surface of a steel pipe sheet pile, and can corrode this uneven surface effectively is provided. Further, according to the present invention, there is provided a pressing plate material capable of closely contacting the anticorrosion layer on the uneven surface of the steel pipe sheet pile.

FIG. 1 is a front view schematically showing an example of use of an anticorrosion structure for a steel pipe sheet pile of the present invention, and is a view showing a state in which an embodiment of the anticorrosion structure is installed on the surface of the steel pipe sheet pile. FIG. 2 is a cross-sectional view schematically showing a cross section (cross section taken along the width direction of the groove portion) taken along the line II of FIG. 1. FIG. 3 is a schematic perspective view of a pressing plate material used in the anticorrosion structure shown in FIG. 1 in a natural state. FIG. 4 is a transverse cross-sectional view schematically showing a cross section taken along line II-II of FIG. 3 (cross section taken along the width direction of the groove portion). FIG. 5 is a cross-sectional view schematically showing a state in which the pressing plate member is released from the pressed state in the anticorrosion structure shown in FIG. FIG. 6 is a view corresponding to FIG. 2 (a sectional view taken along the width direction of the groove portion) of another embodiment of the corrosion prevention structure for a steel pipe sheet pile according to the present invention. FIG. 7 is a view corresponding to FIG. 2 (a sectional view taken along the width direction of the groove portion) of still another embodiment of the corrosion prevention structure for a steel pipe sheet pile according to the present invention. FIG. 8 is a view corresponding to FIG. 2 (a sectional view taken along the width direction of the groove portion) of still another embodiment of the corrosion prevention structure for a steel pipe sheet pile according to the present invention. FIG. 9 is a view corresponding to FIG. 2 (a sectional view taken along the width direction of the groove portion) of still another embodiment of the corrosion prevention structure for a steel pipe sheet pile according to the present invention. FIG. 10 is a view corresponding to FIG. 4 (a cross-sectional view taken along the width direction of the groove portion) of the pressing plate material used in the anticorrosion structure shown in FIG. 9.

  Hereinafter, the present invention will be described based on the preferred embodiments with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may be different from the actual one.

  FIG. 1 and FIG. 2 show an example of use of the anticorrosion structure 5, which is an embodiment of the anticorrosion structure for a steel pipe sheet pile according to the present invention. The anticorrosion structure 5 is installed on the surface 30 of the steel pipe sheet pile 3. The steel pipe sheet pile 3 typically constitutes a revetment installed on the shore of a coast or a river, and since the surface 30 thereof faces the ocean or the river, it is exposed to severe corrosion conditions. The anticorrosion structure for a steel pipe sheet pile of the present invention is used for preventing the surface of such a steel pipe sheet pile that is easily corroded.

  As shown in FIGS. 1 and 2, the steel pipe sheet pile 3 has a structure in which a plurality of steel pipe main bodies 1 are connected via joints 2 (2A, 2B). The surface 30 of the steel pipe sheet pile 3, which is the surface to be protected against corrosion, has irregularities composed of a ridge portion 31 corresponding to the steel pipe body 1 and a groove portion 32 corresponding to the joint 2. The ridges 31 and the grooves 32 are alternately arranged in the connecting direction of the steel pipe body 1. The direction indicated by the symbol X in the drawing is this connecting direction, and is also the width direction of the groove portion 32 and the first direction of the pressing plate member 21 described later. Further, the direction indicated by reference sign Y in the drawing is a direction orthogonal to the direction indicated by reference sign X, and is also the longitudinal direction of the groove portion 32, the axial direction of the steel pipe body 1, and the second direction of the pressing plate member 21 described later.

  The plurality of steel pipe main bodies 1 have a curved outer peripheral surface 1a in a cross-sectional view taken along the first direction X as shown in FIG. 2, and typically have a cylindrical shape. A pair of joints 2 and 2 are joined to the outer peripheral surface 1a of each of the plurality of steel pipe main bodies 1 by welding or the like at intervals in the connecting direction of the plurality of steel pipe main bodies 1. The outer surface 2a of the joint 2 is located at the bottom of the groove 32, and forms the surface 30 of the steel pipe sheet pile 3 together with the outer peripheral surface 1a of the steel pipe body 1. There are various shapes of the joint 2, and in the form shown in FIG. 2, one joint 2A of the two steel pipe main bodies 1 and 1 that are adjacent to each other with the groove 32 interposed therebetween is viewed in cross section along the first direction X. In the above, it is a C-shaped joint having a circular shape in which a part in the circumferential direction is cut out, and a slit is formed in a so-called circular pipe, and the other joint 2B is a T-shaped joint having a T-shape in the same sectional view. Is. In the groove 32, the joints 2A and 2B are connected to each other. Such a connecting portion between the C-type joint and the T-type joint is generally called a P-T type.

  The anticorrosion structure 5 includes an anticorrosion main body 10 including an anticorrosion layer 11 that contacts the surface 30 of the steel pipe sheet pile 3, and a fixing means 20 that is arranged in the groove 32 and presses and fixes the anticorrosion main body 10 to the steel pipe sheet pile 3 side. Prepare

  In the form shown in FIG. 2, the anticorrosion main body 10 includes an anticorrosion layer 11 that contacts the surface 30 of the steel pipe sheet pile 3, specifically, the outer peripheral surface 1 a of the steel pipe main body 1 and the outer surface 2 a of the joint 2, and the anticorrosion main body 10. It includes a protective cover 12 that forms a surface (a surface that comes into contact with a pressing plate member 21 described later) and a buffer layer 13 that is interposed between the anticorrosion layer 11 and the protective cover 12, and has a laminated structure in which these are integrated. is doing.

  The anticorrosion layer 11 is a part that exhibits the anticorrosion function of the anticorrosion main body 10, and is mainly composed of an anticorrosion material. As the anticorrosive material for forming the anticorrosion layer 11, materials conventionally used in the field of coated anticorrosion can be used without particular limitation. For example, petrolatum-based anticorrosive materials; curable resins such as underwater curable resins; resin foams. Materials may be used, and one of these may be used alone, or two or more thereof may be used in combination. Examples of the petrolatum-based anticorrosive material include a paste containing petrolatum as a main component and a corrosion inhibitor and the like. Examples of the curable resin include epoxy resin, urethane resin, silicone resin, polysulfide resin, and polyester resin. Examples of the resin foam material include polyurethane resin, polystyrene resin, polyethylene resin, and rubber resin. The anticorrosion layer 11 may be in the form of a sheet. The sheet-shaped anticorrosion layer 11 is typically a base sheet containing an anticorrosive material. As a specific example, a base sheet such as a nonwoven fabric is impregnated with a petrolatum paste or a compound containing petrolatum as a main component. An example is a petrolatum sheet which is formed into a sheet. The thickness of the anticorrosion layer 11 is not particularly limited as long as it is appropriately set depending on the type of anticorrosion material forming the anticorrosion layer, but is preferably 2 to 10 mm when the anticorrosion layer 11 contains the petrolatum anticorrosion material. .

  As the protective cover 12, those that can be used as a protective cover in this type of anticorrosion structure can be used without particular limitation. For example, a protective cover made of glass fiber reinforced plastic (FRP); polyester resin, epoxy resin, polypropylene resin, A protective cover made of a plastic such as vinyl chloride resin; a protective cover made of a corrosion resistant metal such as stainless steel or titanium.

  The buffer layer 13 is disposed between the anticorrosion layer 11 and the protective cover 12, and functions as a buffer material for increasing the adhesion of the anticorrosion layer 11 to the anticorrosion target surface (the surface 30 of the steel pipe sheet pile 3). . The buffer layer 13 has flexibility and elasticity capable of performing such a function as a buffer material, and further absorbs water when the anticorrosion target is exposed to a marine environment such as a steel pipe sheet pile. It is preferable that the resin foam has a three-dimensional network structure having a three-dimensionally connected skeleton and forming three-dimensionally connected pores by the skeleton. preferable. Examples of the resin foam having continuous pores include foamed polyethylene and foamed polyurethane.

  In the form shown in FIG. 2, the protective cover 12 extends to the groove portion 32 side from each of the anticorrosion main body portions 10 installed on the outer peripheral surfaces 1a of the two steel pipe main bodies 1 and 1 that are adjacent to each other with the groove portion 32 (joint 2) interposed therebetween. The extending portions 12E, 12E of the protective covers 12, 12 overlap each other at the central portion of the groove portion 32 in the width direction X, and the overlapping portion forms the surface of the anticorrosion main body portion 10 installed on the outer surface 2a of the joint 2. It is in contact with the protective cover 12. The extending portion 12E of the protective cover 12 extends in the tangential direction of the protective cover 12 forming the curved surface of the anticorrosion main body portion 10 installed on the outer surface 2a of the joint 2, and the extending portion 12E and the outer surface of the joint 2 are formed. A gap G is formed between the protective cover 12 of the anticorrosion main body 10 installed in 2a.

  As shown in FIG. 2, the fixing means 20 includes a pressing plate member 21 that comes into contact with the protective cover 12 that forms the surface of the anticorrosion main body 10, a bolt 22 that projects in a direction away from the outer surface 2 a of the joint 2, and a bolt 22. And a nut 23 to be screwed. The fixing means 20 shown in FIG. 2 further includes a support base 24 fixed to the outer surface 2a of the joint 2, a fixing plate 25 and a washer arranged with the bolt 22 penetrating between the pressing plate member 21 and the nut 23. (Plain washer) 26. One end of the bolt 22 in the longitudinal direction is fixed to the support base material 24 and projects in a direction away from the steel pipe sheet pile 3 (joint 2). As shown in FIG. 1, the fixing plate 25 has a band shape in plan view extending along the longitudinal direction Y of the groove 32 and is in contact with the surface of the pressing plate member 21. The washer 26 has an annular shape in a plan view and is arranged between the nut 23 and the fixed plate 25. In the form shown in FIG. 2, the pressing plate member 21 comes into contact with the surface of the extending portion 12E of the protective cover 12 extending from each of the two adjacent steel pipe bodies 1 and 1 with the groove portion 32 (joint 2) interposed therebetween. is doing.

  As shown in FIG. 2, the bolt 22 penetrates the anticorrosion main body 10 and the pressing plate member 21 installed on the outer surface 2 a of the joint 2, and the fixing plate is attached to the protruding portion of the bolt 22 from the surface of the pressing plate member 21. 25 and the washer 26 are passed through, and the nut 23 is screwed together, whereby the pressing plate member 21 is pressed toward the joint 2 side and the anticorrosion main body portion 10 is fixed to the surface 30 of the steel pipe sheet pile 3. In this way, the fixing means 20 fixes the surface 30 of the steel pipe sheet pile 3 not only to the "anticorrosion main body portion 10 installed on the outer surface 2a of the joint 2" located at the bottom of the groove portion 32 and penetrated by the bolt 22. , "Corrosion-proof main body portion 10 installed on the outer peripheral surface 1a of two steel pipe main bodies 1 and 1 adjacent to each other with the groove portion 32 (joint 2) interposed therebetween". In this way, the fixing means 20 can fix the plurality of anticorrosion main body portions 10 that surround the groove portion 32 from three sides to the anticorrosion target surfaces (the outer surface 2a of the joint 2 and the outer peripheral surface 1a of the steel pipe main body 1), respectively. This is largely due to the characteristic configuration of the pressing plate member 21 described later.

  As described above, the pressing plate member 21 has a structure in which a plurality of steel pipe main bodies 1 are connected via the joint 2, and the unevenness is formed by the ridge portion 31 corresponding to the steel pipe main body 1 and the groove portion 32 corresponding to the joint 2. When the anticorrosion structure including the anticorrosion layer 11 (the anticorrosion main body 10 in the form shown in FIG. 2) is installed on the surface 30 (see FIG. 1) of the steel pipe sheet pile 3 having the surface 30 in the groove 32, Then, the anticorrosion structure is pressed against and fixed to the steel pipe sheet pile 3 side.

  3 and 4 show the pressing plate member 21 in a natural state, that is, in a state where no external force is applied. As shown in FIGS. 3 and 4, the pressing plate member 21 has a first direction X corresponding to the width direction X of the groove portion 32 of the surface 30 of the steel pipe sheet pile 3 and a second direction Y orthogonal to the first direction X. A pair of both side portions having the second direction Y are bent toward the one surface 21a side of the pressing plate member 21 to form a bent portion 210.

  Then, as shown in FIGS. 3 and 4, in the natural state of the pressing plate member 21, a portion of the pressing plate member 21 sandwiched between the pair of bent portions 210, 210 is located on one surface 21a side (the bent portion 210 is bent). The curved portion 211 is convexly curved toward the side) and has an arc shape in a cross-sectional view along the first direction X as shown in FIG. The bending portion 211 is deformed into a flat shape by pressing the bending portion 211 to the side opposite to the one surface 21a side (the other surface 21b side), and when the pressing is released, it is bent back by spring back. Return to the state.

  The pressing plate member 21 is made of a strip-shaped material that can exhibit such springback. Examples of the material for forming the pressing plate member 21 include metals such as titanium, titanium alloys, and stainless steel. The pressing plate member 21 is composed of one kind of these materials or a combination of two or more kinds thereof. The pressing plate material 21 typically has a single-layer structure as shown in the figure, but may have a laminated structure in which a plurality of layers are laminated, and in this case, the plurality of layers may have the same composition or different compositions. May be.

  In the natural state, the bent portion 210 of the pressing plate material 21 is curved as shown in FIG. The curved bent portion 210 has an arc shape in a cross-sectional view along the first direction X as shown in FIG. 4, and faces the curved portion 211.

  As shown in FIGS. 3 and 4, a bolt insertion hole 212 is formed in the curved portion 211 of the pressing plate member 21. As described above, in the anticorrosion structure 5 to which the pressing plate member 21 is applied, as shown in FIG. 2, the bolt 22 for fixing the pressing plate member 21 protrudes from the surface of the joint 2, that is, the outer surface 2a, and is installed on the outer surface 2a. When the anticorrosion main body 10 is penetrated, the bolt 22 is inserted into the bolt insertion hole 212. The bolt insertion holes 212 are intermittently arranged in the second direction Y at the central portion of the pressing plate member 21 in the first direction X. In the pressing plate member 21 having the above-described configuration, the bolt 22 is passed through the bolt insertion hole 212, and the nut 23 is screwed into the projecting portion of the bolt 22 from the surface of the pressing plate member 21. While being pressed to the side to be deformed into a flat shape, the anticorrosion structure including the anticorrosion layer 11 (the anticorrosion main body portion 10 in the form shown in FIG. 2) can be fixed to the surface of the steel pipe sheet pile 3.

  As shown in FIG. 2, in the pressing plate member 21, the pair of bent portions 210, 210 are connected to the groove portion 32 (joint) while the curved portion 211 is pressed by the tightening of the bolt 22 and the nut 23 to be deformed into a flat shape. 2) so as to be able to come into contact with the anticorrosion structure (the anticorrosion main body portion 10 in the form shown in FIG. 2) installed on the outer peripheral surface 1a of each of the two steel pipe main bodies 1, 1 that are adjacent to each other. Accordingly, in a state where the curved portion 211 is pressed and deformed into a flat shape, the anticorrosion main body portion 10 installed on the outer surface 2a of the joint 2 is pressed toward the joint 2 side by the curved portion 211 deformed into a flat shape. In addition, the pair of anticorrosion main body portions 10, 10 installed on the outer peripheral surfaces 1a of the two steel pipe main bodies 1, 1 located on both sides of the joint 2 are pressed toward the steel pipe main body 1 side by the bent portions 210. . At this time, the bent portion 210 maintains its curved shape, as shown in FIG. 2, and comes into contact with the anticorrosion main body portion 10 installed on the outer peripheral surface 1 a of the steel pipe main body 1 at “points”.

  In the anticorrosion structure 5, as shown in FIG. 2, the pressing plate member 21 extends from one of the two adjacent steel pipe main bodies 1 and 1 across the groove 32 (joint 2) to the other. The pair of bent portions 210, 210 of the pressing plate member 21 are directly or indirectly superposed on the anticorrosion main body portion 10 installed on the outer peripheral surface 1a of each of the two steel pipe main bodies 1, 1. As used herein, "directly overlaid" means a state in which the bent portion 210 and the anticorrosion main body portion 10 are in contact with each other, and "indirectly overlaid" indicates that the folded portion 210 and the anticorrosion main body portion 10 are in contact with each other. It means a state in which another member is interposed between. In the form shown in FIG. 2, the bent portion 210 is directly overlapped with the anticorrosion main body portion 10 installed in the steel pipe main body 1, and both are in contact with each other. Further, the curved portion 211 of the pressing plate 21, that is, the portion sandwiched between the pair of bent portions 210, 210 is in a state in which the bolt 22 penetrates and is pressed to the joint 2 side by the nut 23 screwed to the bolt 22. , Is directly or indirectly superposed on the anticorrosion main body 10 installed on the outer surface 2a of the joint 2. In the form shown in FIG. 2, the extension of the protective cover 12 extending from the anticorrosion main body 10 installed in the steel pipe main body 1 between the curved portion 211 and the anticorrosion main body 10 installed in the outer surface 2 a of the joint 2. The curved portion 211 is indirectly overlapped with the anticorrosion main body portion 10 installed in the joint 2 with the portion 12E interposed.

  As shown in FIG. 2, when the pressing plate member 21 (curved portion 211) is pressed by tightening the bolt 22 and the nut 23, the nut 23 is removed from the bolt 22 and the pressing state of the pressing plate member 21 is released. As shown in, the curved portion 211 (a portion of the pressing plate member 21 sandwiched between the pair of bent portions 210, 210) is curved in a direction away from the joint 2 by spring back.

  The anticorrosion structure 5 has the anticorrosion target surface (the outer peripheral surface 1a of the steel pipe body 1 and the outer surface of the joint 2) of the anticorrosion main body 10 installed on each part of the surface 30 of the steel pipe sheet pile 3 by the characteristic configuration of the pressing plate member 21 described above. The adhesion to 2a) is good, and the surface 30 has an excellent anticorrosion effect. That is, as described above, the pressing plate member 21 has the curved portion 211 and exhibits the springback characteristic. Therefore, as shown in FIG. 2, the curved portion 211 is pressed by the bolts 22 and the nuts 23 to be deformed into a flat shape. Then, when the bent portion 210 is in contact with the anticorrosion main body 10 installed on the outer peripheral surface 1a of the steel pipe main body 1, the anticorrosion main body 10 located between the deformed curved portion 211 and the joint 2 is The outer surface 2a of the anticorrosion main body 10 installed on the steel pipe body 1 is pressed to the side of the steel pipe body 1 by the reaction force generated by the spring-back characteristic of the pressing plate member 21. Stick to. As described above, in the anticorrosion structure 5, the anticorrosion main body 10 that surrounds the groove 32 from three sides is provided by the single pressing plate member 21 fixed to the bottom of the groove 32 (the outer surface 2a of the joint 2) by the bolt 22 and the nut 23. The surfaces to be protected against corrosion (the outer surface 2a of the joint 2 and the outer peripheral surface 1a of the steel pipe body 1) are pressed against and closely contact with each other, so that each surface to be protected against corrosion can be effectively protected.

  Further, the pressing plate member 21 has a pair of both side portions along the second direction Y (longitudinal direction of the groove portion 32) as bent portions 210, and a portion sandwiched between the pair of bent portions 210 in a natural state is one surface. Since the curved portion 211 is convexly curved toward the 21a side, the bent portion 210 can smoothly move to the steel pipe body 1 side when the corrosion-preventing body portion 10 is pressed against the steel pipe sheet pile 3 side and fixed, and at the same time, At the boundary portion, which is the boundary between the portion 10 and the extending portion 12E of the protective cover 12, the bent portion 210 can largely press the anticorrosion main body portion 10 to bring them into close contact with each other. The adhesion effect of the anticorrosion main body portion 10 by the pressing of the bent portion 210 is an effect that is difficult to be achieved when the conventional flat pressing plate material is used.

  In addition, since the pair of both side portions along the second direction Y (longitudinal direction of the groove portion 32) of the pressing plate member 21 are bent to form the bent portion 210, as compared with the case where the both side portions are not bent, The bending rigidity of the both sides in the second direction Y is improved. If the bending rigidity of both sides of the pressing plate member 21 in the second direction Y is low, when the curved portion 211 is deformed into a flat shape by tightening with the bolts 22 and the nuts 23, the both sides become wavy, and the anticorrosion main body portion. Although there is a possibility that the adhesiveness of 10 may be deteriorated, in the anticorrosion structure 5, since both sides of the pressing plate 21 are the bent portions 210, such inconvenience is prevented.

The size of each part of the pressing plate member 21 is not particularly limited, but can be set as follows, for example.
The length Lx of the pressing plate member 21 in the natural state in the first direction X (see FIG. 4), that is, the length Lx of the pressing plate member 21 in the natural state in the width direction X in a plan view is preferably 140 to 200 mm, and more preferably It is 150 to 180 mm.
When the bent portion 210 is curved as shown in FIG. 4, the radius of curvature of the curved portion is preferably 5 to 20 mm, more preferably 8 to 15 mm.
The maximum height H of the curved portion 211 (see FIG. 4), that is, the portion where the height from the flat surface when the pressing plate material 21 in a natural state is placed on the flat surface is maximum (typically, the pressing plate material 21 The height H in the first direction X) is preferably 2 to 10 mm, more preferably 4 to 8 mm.
The radius of curvature of the curved portion 211 is preferably 100 to 200 mm, more preferably 120 to 180 mm.
The diameter R (see FIG. 4) of the bolt insertion hole 212 is preferably 16 to 32 mm, more preferably 20 to 30 mm.
The interval S (see FIG. 3) between the bolt insertion holes 212 adjacent to each other in the second direction Y is preferably 50 to 300 mm, more preferably 150 to 250 mm.

  6 to 10 show another embodiment of the anticorrosion structure (holding plate material) of the present invention. In the embodiments to be described later, constituent parts different from the above-described anticorrosion structure 5 and the pressing plate member 21 will be mainly described, and similar constituent parts will be denoted by the same reference numerals and description thereof will be omitted. The description of the anticorrosion structure 5 and the pressing plate member 21 is appropriately applied to components that are not particularly described.

  The anticorrosion structure 5A shown in FIG. 6 differs from the above-described anticorrosion structure 5 in the structure of the anticorrosion main body 10. In the anticorrosion structure 5A, as shown in FIG. 6, the extending portion 12E of the protective cover 12 extending from each of the two adjacent steel pipe main bodies 1 and 1 with the groove portion 32 (joint 2) interposed therebetween is the outer surface 2a of the joint 2. It functions as a protective cover 12 of the anticorrosion main body 10 installed in the. In addition, in the anticorrosion structure 5A, the buffer layer 13 is filled between the extending portion 12E of the protective cover 12 and the anticorrosion layer 11 that contacts the outer surface 2a of the joint 2, and the extending portion present in the anticorrosion structure 5 is present. There is no gap G between 12E and the other protective cover 12. The anticorrosion structure 5A has the same effect as the anticorrosion structure 5.

  In the anticorrosion structure 5B shown in FIG. 7, the fixing means 20 (holding plate member 21) is installed in a so-called PP type connecting portion in which joints 2A which are C type joints are connected. In the anticorrosion structure 5B, one supporting base material 24 for fixing the bolt 22 to the outer surface 2a of the joint 2A is arranged so as to straddle the two joints 2A, 2A connected to each other in the first direction X. Except for the above points, the anticorrosion structure 5B includes the anticorrosion structure 5A (the extending portion 12E of the protective cover 12 extending from the steel pipe body 1 includes the protective cover 12 of the anticorrosion body portion 10 installed on the outer surface 2a of the joint 2). It is configured in the same manner as (combined form). The anticorrosion structure 5B also has the same effect as the anticorrosion structure 5.

  In the anticorrosion structure 5C shown in FIG. 8, a plurality of (two) bolts 22 are provided in the groove 32 by fixing the bolts 22 to the outer surfaces 2a of the two connected joints 2A, 2A via the support base material 24. , 22 are intermittently arranged in the first direction X, the same number (two) of bolts 22 as the number of bolts 22 arranged in the first direction X of the groove portion 32 in the first direction X of the pressing plate member 21P. The insertion holes 212 are arranged intermittently. The anticorrosion structure 5C is particularly useful when the width of the groove 32 (the length in the first direction X) is relatively long. The anticorrosion structure 5C is configured similarly to the anticorrosion structure 5B except for the above points. The same effect as that of the anticorrosion structure 5 can be obtained by the anticorrosion structure 5C.

  In the anticorrosion structure 5D shown in FIG. 9, the fixing means 20 (holding plate member 21Q) is a joint 2B that is a T-shaped joint, and a joint 2C that is a so-called L-shaped joint that is L-shaped in a sectional view along the first direction X. It is installed in a so-called LT type connecting part in which and are connected. Further, in the pressing plate member 21Q used for the anticorrosion structure 5D, in the natural state, the bent portion 210 is bent in a V shape with respect to the curved portion 211 in a cross-sectional view taken along the first direction X as shown in FIG. ing. The bending portion 210 of the pressing plate member 21Q is not curved like the bending portion 210 of the pressing plate member 21 (see FIG. 4) described above, and has a substantially straight line shape in a cross-sectional view along the first direction X, and the bending portion 211. Not facing each other. Further, as shown in FIG. 9, the bent portion 210 of the pressing plate member 21Q is installed on the outer peripheral surface 1a of the steel pipe body 1 when the curved portion 211 is pressed by the bolts 22 and the nuts 23 and deformed into a flat shape. It comes into contact with the anticorrosion main body portion 10 in a “face”. The anticorrosion structure 5D has the same configuration as the anticorrosion structure 5B except for the above points. The same effect as that of the anticorrosion structure 5 can be obtained by the anticorrosion structure 5D.

Although the present invention has been described based on its preferred embodiment, the present invention is not limited to the above embodiment, and the configuration included in one embodiment may be included in another embodiment.
For example, as an embodiment of the pressing plate material of the present invention, one in which the bent portion is curved (see FIG. 4) and one in which the bent portion is not curved (see FIG. 10) are cited. Shows an example applied to a steel pipe sheet pile connected via a P-T type connecting portion (see FIG. 2), and in the latter pressing plate material, a plurality of steel pipe main bodies are connected via an LT type connecting portion. Although the example applied to the steel pipe sheet pile is shown (refer to FIG. 9), the application example of the pressing plate material of the present invention is not limited to these, and for example, the former pressing plate material is provided with an LT type connecting portion as shown in FIG. 9. The steel plate sheet pile may be applied to the steel pipe sheet pile, or the latter pressing plate material may be applied to the steel pipe sheet pile having a connecting portion other than the LT connecting portion.
Further, as the anticorrosion main body 10 installed on the outer surface 2a of the joint 2, one having a protective cover 12 dedicated to the anticorrosion main body 10 (see FIG. 2), and the extension of the protective cover 12 extending from the steel pipe main body 1. An example in which the protruding portion 12E also serves as the protective cover 12 of the anticorrosion main body portion 10 (see FIGS. 6 to 9) is shown, and the former is applied to a steel pipe sheet pile having a PT type connecting portion. , An example of application to a steel pipe sheet pile having a connecting portion other than the P-T type connecting portion has been shown, but application examples of the anticorrosion main body portion according to the present invention are not limited to these, and for example, the former is shown in FIG. It may be applied to a steel pipe sheet pile having a connecting portion other than the PT type connecting portion as shown in FIG. 9, and the latter may be applied to a steel pipe sheet pile having a PT type connecting portion as shown in FIG. Good.

1 Steel pipe main body 1a Outer peripheral surface of the steel pipe main body (part of the surface of the steel pipe sheet pile)
2, 2A, 2B, 2C Joint 2a Joint outer surface (part of the surface of the steel pipe sheet pile)
3 Steel pipe sheet pile 30 Surface of steel pipe sheet pile (corrosion-proof surface)
31 Ridge 32 Groove 5, 5A, 5B, 5C, 5D Anticorrosion Structure 10 Anticorrosion Main Body 11 Anticorrosion Layer 12 Protective Cover 13 Buffer Layer 20 Fixing Means 21, 21P, 21Q Pressing Plate Material 210 Bending Part 211 Bending Part 212 Bolt Insertion Hole 22 Bolt 23 Nut 24 Supporting substrate 25 Fixing plate 26 Washer X First direction (groove width direction)
Y second direction (longitudinal direction of groove)

Claims (6)

It has a structure in which a plurality of steel pipe main bodies are connected via a joint, and has unevenness composed of a ridge portion corresponding to the steel pipe main body and a groove portion corresponding to the joint, and is installed on the surface of the steel pipe sheet pile. , A steel pipe sheet pile anti-corrosion structure,
An anticorrosion main body including an anticorrosion layer that comes into contact with the surface of the steel pipe sheet pile, and a fixing means that is arranged in the groove and presses and fixes the anticorrosion main body portion to the steel pipe sheet pile side,
The fixing means includes a pressing plate member that comes into contact with the surface of the anticorrosion main body portion, a bolt protruding from the outer surface of the joint, and a nut screwed with the bolt.
The bolt penetrates the anticorrosion main body portion and the pressing plate member, and the nut is screwed into a protruding portion of the bolt from the surface of the pressing plate member, so that the pressing plate member is pressed toward the joint side. Along with, the anticorrosion main body is fixed to the surface of the steel pipe sheet pile,
The pressing plate member has a first direction corresponding to the width direction of the groove and a second direction orthogonal to the first direction, and extends from one to the other of the two steel pipe main bodies adjacent to each other with the groove interposed therebetween. Has been extended,
A pair of both side portions of the pressing plate member along the second direction are bent toward the front surface side of the pressing plate member to be bent portions, and the pair of bent portions are adjacent to each other with the groove portion interposed therebetween. Overlaid on the anticorrosion main body installed on each outer peripheral surface,
A portion of the pressing plate member sandwiched between the pair of bent portions was installed on the outer surface of the joint in a state in which the bolt was penetrated and pressed to the joint side by the nut screwed to the bolt. Overlaid on the anticorrosion body,
A portion of the pressing plate member sandwiched between the pair of bent portions can be curved in a direction away from the joint by spring back by removing the pressed state of the pressing plate member by removing the nut from the bolt , Anticorrosion structure for steel pipe sheet pile. The steel pipe sheet pile has a structure in which a plurality of steel pipe main bodies are connected to each other through a joint, and has unevenness composed of a ridge portion corresponding to the steel pipe main body and a groove portion corresponding to the joint, on the surface of the steel pipe sheet pile. In the case of installing an anticorrosion structure including, a pressing plate material that is arranged in the groove portion and presses and fixes the anticorrosion structure on the steel pipe sheet pile side,
A pair of both side portions having a first direction corresponding to the width direction of the groove portion and a second direction orthogonal to the first direction and extending along the second direction are bent to one surface side of the pressing plate member. It is a bent part,
In a natural state, the bent portion is bent in a V shape with respect to the curved portion in a cross-sectional view along the first direction,
In a natural state, the portion sandwiched by the pair of bent portions is a curved portion that is convexly curved to the one surface side,
The pressing portion is a pressing plate member that is deformed into a flat shape by pressing the bending portion to the side opposite to the one surface side, and returns to the original curved state when the pressing is released. Bolts for fixing the pressing plate material protrudes from the outer surface of the joint, and penetrates the anticorrosion structure installed on the outer surface of the joint,
An insertion hole for the bolt is formed in the curved portion,
The bolt is passed through the insertion hole, and a nut is screwed onto a protruding portion of the bolt from the surface of the pressing plate member, thereby pressing the curved portion toward the joint side to deform it flatly. The pressing member according to claim 2, wherein an anticorrosive structure can be fixed to the surface of the steel pipe sheet pile. In a state where the curved portion is pressed and deformed into a flat shape, the pair of bent portions come into contact with the anticorrosion structure provided on the outer peripheral surface of each of the two steel pipe main bodies adjacent to each other with the groove portion interposed therebetween. The pressing plate material according to claim 3, which is obtained. The steel pipe sheet pile has a structure in which a plurality of steel pipe main bodies are connected to each other through a joint, and has unevenness composed of a ridge portion corresponding to the steel pipe main body and a groove portion corresponding to the joint, on the surface of the steel pipe sheet pile. In the case of installing an anticorrosion structure including, a pressing plate material that is arranged in the groove portion and presses and fixes the anticorrosion structure on the steel pipe sheet pile side,
A pair of both side portions having a first direction corresponding to the width direction of the groove portion and a second direction orthogonal to the first direction and extending along the second direction are bent to one surface side of the pressing plate member. It is a bent part,
In a natural state, the bent portion is curved ,
In a natural state, the portion sandwiched by the pair of bent portions is a curved portion that is convexly curved to the one surface side,
The bending portion is deformed into a flat shape by pressing the bending portion to the side opposite to the one surface side, and returns to the original curved state when the pressing is released,
Bolts for fixing the pressing plate material protrudes from the outer surface of the joint, and penetrates the anticorrosion structure installed on the outer surface of the joint,
An insertion hole for the bolt is formed in the curved portion,
The bolt is passed through the insertion hole, and a nut is screwed onto a protruding portion of the bolt from the surface of the pressing plate member, thereby pressing the curved portion toward the joint side to deform it flatly. The anticorrosion structure can be fixed to the surface of the steel pipe sheet pile ,
In a state where the curved portion is pressed and deformed into a flat shape, the pair of bent portions come into contact with the anticorrosion structure provided on the outer peripheral surface of each of the two steel pipe main bodies adjacent to each other with the groove portion interposed therebetween. The pressing plate material to obtain. The pressing plate material according to any one of claims 2 to 5 , which is configured to include at least one selected from the group consisting of titanium, titanium alloys, and stainless steel.

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