JP3741585B2 - Anti-corrosion protective material fastening structure and fastening method - Google Patents

Description

【００３３】
【表２】

【００３４】
表２の結果から明らかなように、機械的固定に加え、表面と裏面に繊維強化プラスチックの積層を行った実施例１は、継ぎ目の無い板材を用いた比較例１とほぼ同等の強度を発揮することが判った。このような構造を持つ防食保護材は、機械的固定と繊維強化プラスチックの積層との相乗効果によって、波浪や潮流の激しい苛酷な環境でも充分に使用することができる。これに対して、比較例２〜４は、比較例１に比べて強度に劣ったものであった。
【００３５】
また、繊維強化プラスチックの積層が表面のみの実施例２は、継ぎ目の無い板材を用いた比較例１に比較して、約３割の強度低下が見込まれ、比較例３〜４と同等であるが、機械的固定部材の防食保護及びフランジの締付け固定時の反動によるフランジ近傍の盛り上がりを防止できるため、内湾のような比較的穏やかな環境の防食保護材として使用できる。
【００３６】
これに対して、比較例３は、表面の積層がないため、機械的固定手段（リベット、ボルト等）が腐食の問題が生じる。また、比較例４は、接着固定のみなので、剪断方向の剥離の問題や接着力の経時的低下が生じ、長期の耐久性に問題がある。
【００３７】
【発明の効果】
以上説明したように、本発明の防食保護材の締結構造及びその締結方法は、高強度を有し、また短時間で簡便に製作でき、しかも様々な杭径に対応できる。
【図面の簡単な説明】
【図１】図１は、本発明の防食保護材の締結構造の一例を示す斜視図である。
【図２】図２は、図１の防食保護材の締結構造の断面図である。
【符号の説明】
１：Ｌ型アングル材
２：板状材
３：表面ＦＲＰ積層体
４：機械的固定手段（接合部固定用リベット）
５：防食保護材締結用ボルト穴
６：裏面ＦＲＰ積層体
７：アングル・板接合部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fastening structure of an anticorrosion protective material such as a steel pipe pile in a marine environment and a fastening method thereof, and in particular, an anticorrosion protective material having a high strength comparable to that of the conventional method by a combination of machined processed products, The present invention relates to a fastening structure for an anti-corrosion protective material that can be easily manufactured in a shorter time than conventional methods and that can handle various pile diameters, and a fastening method thereof.
[0002]
[Prior art and problems to be solved by the invention]
Steel pipe piles that support floating facilities, such as piers, are susceptible to corrosion from long-term use. In particular, the tendency is remarkable in the splash zone where contact with seawater and contact with oxygen in the air are repeated.
[0003]
For this reason, the trial which coat | covers the outer peripheral surface of a steel pipe pile with an anti-corrosion protective material (cover material) conventionally is made | formed. This type of anti-corrosion protection material is used for various steel pipe pile diameters, and each of the corresponding molds is used, and glass fiber reinforced plastic (FRP) lamination is repeated manually, and the anti-corrosion protection material has a predetermined thickness and strength. The method of creating is common.
[0004]
Although this method can produce anti-corrosion protection material that matches the pile diameter, each mold must be prepared, and manual lamination requires a lot of labor and time until the resin hardens. There is a problem that continuous work cannot be done because it cannot be removed from the mold.
[0005]
As another method, there is a method using a mechanical molding material. This method is generally divided into an angle-shaped flange portion serving as a fastening portion or a joint portion of the anticorrosion protective material and a plate material serving as the anticorrosion portion, and the two are coupled to create an anticorrosion protective material. As a bonding method at this time, a method in which a heating wire is provided between the two made of a thermoplastic resin and heat-sealed (Japanese Patent Publication No. 61-32468), and a method in which both are bonded with an adhesive (Actual 3- No. 22273). It has also been proposed to continuously machine and process an anticorrosion protective material at once using a polyolefin resin (Japanese Patent Laid-Open No. 59-62110).
[0006]
However, according to the method disclosed in Japanese Patent Publication No. 61-32468, it is possible to produce an anticorrosion protective material with little production effort and a constant finish, but the bonded end portion of the fused angle material and plate material is When tightened with bolts, it spreads due to the reaction of the tightening force. For this reason, a wedge-like peeling force works over time, and there is a risk of damage in a marine environment with large waves.
[0007]
In addition, as in the method described in Japanese Utility Model Publication No. 3-22273, there is a method in which an angle material and a plate material are bonded with an adhesive, and a plate of the same material as the plate material is also attached to the upper side of the angle material. The method has poor long-term durability because the adhesive strength decreases with time. Especially in the marine environment, the problem remains because it is repeatedly stressed by waves and tidal currents.
[0008]
Further, as in JP-A-59-62110, in the case where the entire anticorrosion protective material is machine-formed at once, if the anticorrosion protective material is fixed to a flange type, the thickness is insufficient. On the other hand, if the plate thickness is increased due to the flange, the entire anticorrosion protective material becomes heavy, and the workability at the time of attachment is remarkably lowered.
[0009]
Further, an anticorrosion protective material using a machine-formed product of titanium or a titanium alloy has been proposed (Japanese Patent Publication No. 2-19253 and Japanese Patent Publication No. 2-19254).
[0010]
In this case, since titanium with excellent corrosion resistance in the marine environment is used, it becomes an anticorrosion protection material having higher strength and durability than plastic materials, but generally when making a flange structure only with a titanium plate, Since the plate thickness is thin, it will be bent by bolting. Therefore, in order to maintain the flange structure, it is necessary to attach the molded angle material as a protective material.
[0011]
Further, there are those in which an ultraviolet-curing type FRP tape is used to create an anti-corrosion protective material, and the flange shape and the protective material are changed.
[0012]
When UV curable FRP tape is used, anti-corrosion protective material that does not require a flange is possible, but because it is UV curable, it is difficult to cure in water and where UV radiation is insufficient even in the atmosphere. Then, a dedicated ultraviolet irradiation device for that purpose is required.
[0013]
Accordingly, an object of the present invention is to provide a fastening structure and a fastening method for an anticorrosion protective material that has high strength, can be easily manufactured in a short time, and can cope with various pile diameters.
[0014]
[Means for Solving the Problems]
As a result of the study, the present inventors have found that the above object can be achieved by a combination of mechanically molded products.
[0015]
The present invention has been made on the basis of the above findings, and is a fastening structure of an anticorrosion protective material covering the outer peripheral surface of a steel pipe surface, comprising an inner surface of one piece of an L-shaped angle member made of fiber reinforced plastic, and fiber reinforced plastic. One end of the plate-like material is mechanically fixed to form a joint, and a fiber reinforced plastic is laminated on the front surface or the front and back surfaces of the joint, and provided in advance on the other piece of the L-shaped angle material. An anti-corrosion protection material fastening structure is provided which is fastened and fixed with bolts and nuts through the anti-corrosion protection material fastening holes.
[0016]
The present invention also relates to a method for fastening an anticorrosion protective material for covering the outer peripheral surface of a steel pipe, comprising an inner surface of an L-shaped angle member made of a fiber-reinforced plastic subjected to continuous machine molding, and a fiber molded and processed in the same manner as described above. One end of a plate material made of reinforced plastic is mechanically fixed, a joint is formed, and the same fiber reinforced plastic is laminated on the front surface or front and back surfaces of the joint, and the L-shaped angle member The present invention provides a method for fastening an anticorrosion protective material, characterized by using a hole for fastening an anticorrosive protective material provided in advance on another piece and fastening with bolts and nuts.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a fastening structure of an anticorrosion protective material of the present invention, and FIG. 2 is a cross-sectional view thereof. 1 and 2, 1 is an L-shaped angle material, 2 is a plate-like material, 3 is a surface FRP laminate, 4 is a mechanical fixing means (joint fixing rivet), and 5 is a bolt hole for fastening an anticorrosion protective material. , 6 is a back FRP laminate, and 7 is an angle / plate joint.
[0018]
1 and 2, the L-shaped angle member 1 is made of a fiber reinforced plastic manufactured by continuous machine molding. As the fiber used here, glass fiber, carbon fiber or the like is used, and glass fiber is preferable from the viewpoint of economy. As the plastic, a thermosetting resin is preferable, and an unsaturated polyester excellent in weather resistance is particularly preferable.
[0019]
An inner surface of one piece of the L-shaped angle material 1 and one end of a plate-shaped material 2 made of fiber-reinforced plastic manufactured by continuous machine molding processing like the L-shaped angle material are mechanically fixed. A joint 7 is formed. Examples of the mechanical fixing means 4 include rivets and bolts.
[0020]
Further, the portion of the L-shaped angle material 1 where the angle / plate joint 7 is formed is thin by the thickness of the plate material and has a step, and the surface of the anticorrosion protection material is the same when joining with the plate material. It is desirable to have a structure with a thickness. As a result, when the surface of the anticorrosion protective material is concentric with the steel pipe and the thickness change on the inside is absorbed by a cushioning material such as polyethylene foam, no deformation occurs when the anticorrosive protective material is attached to the steel pipe. .
[0021]
In the present invention, a fiber reinforced plastic, for example, a glass fiber reinforced polyester laminate as described above (surface FRP laminate 3 and back FRP laminate 6) is applied to the surface or the front and back surfaces of the angle / plate joint 7. The The number of laminated fiber reinforced plastic laminates is arbitrary. In addition, by applying the plastic-specific primer to the angle / plate joint 7, adhesion of the fiber-reinforced plastic laminate to the joint becomes stronger. Since the lamination | stacking operation | work of the FRP laminated body to the surface of this junction part or the surface and a back surface does not require a type | mold and there is no process which requires especially skill, it can work easily in a short time.
[0022]
In the present invention, double mechanical joining force is applied to the angle / plate joint 7 by mechanical fixing such as rivets and bolts and lamination with fiber reinforced plastic as described above. It has the strength of In addition, when metal materials such as stainless steel are used for rivets, bolts, etc., these metal materials are coated and protected against corrosion by laminating fiber reinforced plastic on the surface of the joint or on the front and back surfaces, and their functions are maintained over the long term. Can be maintained.
[0023]
The other piece (flange) of the L-shaped angle member 1 is provided with an anti-corrosion protection material fastening hole 5 and is fastened and fixed with a bolt and a nut. By extending the above-mentioned back surface FRP laminate 6 to the other piece of the L-shaped angle member 1, it is difficult to produce only with the machine-formed material, and only the other piece can be further strengthened. Even if strong tightening pressure is applied, deformation of other pieces can be prevented.
[0024]
【Example】
Hereinafter, the present invention will be specifically described based on examples and the like.
[0025]
[Example 1]
Glass fiber reinforced plastic plates having a thickness of 5 mm and 2 mm were used, the glass fiber reinforced plastic plate having a thickness of 5 mm was used as the front side, and riveting and lamination of the glass fiber reinforced plastic on the front and back surfaces were performed. The rivet was a SUS type φ5 mm, and the overlap margin of the joint was about 30 mm centering on the rivet. As the plastic, room temperature curing type isophthalic acid polyester was used, and the lamination was about 100 mm centering on rivets on both sides. As shown in Table 1, the number of laminations was 1 ply for the front FRP laminate and 2 plies for the back FRP laminate.
[0026]
Using this test piece, the load was evaluated according to JIS K7054. The load is a value when the test piece (25 mm in width) breaks, and is indicated by the maximum value, the minimum value, and the average value of 5 pieces. The results are shown in Table 2.
[0027]
[Example 2]
As shown in Table 1, a test piece was prepared in the same manner as in Example 1 except that the back surface was not laminated, and the load was measured in the same manner as in Example 1. The results are shown in Table 2.
[0028]
[Comparative Example 1]
As shown in Table 1, a glass fiber reinforced plastic plate having a thickness of 2 mm used in Example 1 was used as a test piece. The load was measured in the same manner as in Example 1. Moreover, about this test piece, the intensity | strength per unit area was evaluated. The results are shown in Table 2.
[0029]
[Comparative Example 2]
As shown in Table 1, test pieces were prepared in the same manner as in Example 1 except that the front and back surfaces were not laminated, and the load was measured in the same manner as in Example 1. The results are shown in Table 2.
[0030]
[Comparative Example 3]
As shown in Table 1, a test piece was prepared in the same manner as in Example 1 except that the surface was not laminated, and the load was measured in the same manner as in Example 1. The results are shown in Table 2.
[0031]
[Comparative Example 4]
As shown in Table 1, a test piece was prepared in the same manner as in Example 1 except that riveting was not performed, and the load was measured in the same manner as in Example 1. The results are shown in Table 2.
[0032]
[Table 1]

[0033]
[Table 2]

[0034]
As is clear from the results in Table 2, Example 1 in which fiber reinforced plastics were laminated on the front and back surfaces in addition to mechanical fixation exhibited substantially the same strength as Comparative Example 1 using a seamless plate material. I found out that The anticorrosion protective material having such a structure can be sufficiently used even in severe environments where waves and tides are intense due to the synergistic effect of mechanical fixation and lamination of fiber reinforced plastic. On the other hand, Comparative Examples 2 to 4 were inferior in strength compared to Comparative Example 1.
[0035]
In addition, Example 2 in which the fiber reinforced plastic is laminated only on the surface is expected to have a strength reduction of about 30% compared to Comparative Example 1 using a seamless plate material, and is equivalent to Comparative Examples 3 and 4. However, since the anti-corrosion protection of the mechanical fixing member and the bulge in the vicinity of the flange due to the recoil at the time of tightening and fixing the flange can be prevented, it can be used as an anti-corrosion protective material in a relatively mild environment such as an inner bay.
[0036]
On the other hand, since Comparative Example 3 has no surface lamination, mechanical fixing means (rivets, bolts, etc.) have a problem of corrosion. Further, since Comparative Example 4 is only adhesive fixing, there is a problem of peeling in the shear direction and a decrease in adhesive force with time, and there is a problem in long-term durability.
[0037]
【The invention's effect】
As described above, the anticorrosion protection material fastening structure and the fastening method of the present invention have high strength, can be easily manufactured in a short time, and can cope with various pile diameters.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a fastening structure of an anticorrosion protective material according to the present invention.
FIG. 2 is a cross-sectional view of the fastening structure of the anticorrosion protective material of FIG. 1;
[Explanation of symbols]
1: L-shaped angle material 2: Plate-shaped material 3: Surface FRP laminate 4: Mechanical fixing means (joint fixing rivet)
5: Bolt hole for fastening anticorrosion protective material 6: Back FRP laminate 7: Angle / plate joint

Claims (7)

A fastening structure of an anti-corrosion protection material covering the outer peripheral surface of the steel pipe surface, wherein an inner surface of an L-shaped angle material made of fiber reinforced plastic and one end of a plate material made of fiber reinforced plastic are mechanically fixed. The joint portion is formed, and a fiber reinforced plastic is laminated on the front surface or the front and back surfaces of the joint portion, and bolts and nuts are provided by anticorrosion protection material fastening holes provided in advance on the other piece of the L-shaped angle member. Fastening structure of anti-corrosion protective material that is fastened and fixed with The portion forming the joint portion of the L-shaped angle material is thin by the thickness of the plate-like material, has a step, and the anticorrosion protection material surface has the same thickness when joined to the plate-like material. Fastening structure of anti-corrosion protection material. The fastening structure of the anticorrosion protection material according to claim 1 or 2, wherein the lamination on the back surface side is extended to the other piece of the L-shaped angle material, and deformation of the angle material can be prevented when tightening the bolt and nut. The fastening structure of the anticorrosion protective material according to claim 1, wherein the fiber reinforced plastic is a glass fiber reinforced plastic. The fastening structure for an anticorrosion protective material according to any one of claims 1 to 4, wherein the mechanically fixing means is a rivet or a bolt. The fastening structure of the anticorrosion protective material according to any one of claims 1 to 5, wherein a dedicated primer of a laminated resin is applied to a surface of the joint portion. A method for fastening an anti-corrosion protection material covering the outer peripheral surface of a steel pipe, which is a plate-like shape made of an L-shaped angle member made of a fiber-reinforced plastic that has been continuously machine-molded and a fiber-reinforced plastic that has been molded and processed in the same manner One end of the material is mechanically fixed, a joint portion is formed, the same fiber reinforced plastic is laminated on the front surface or the front and back surfaces of the joint portion, and provided in advance on the other piece of the L-shaped angle material. A method for fastening an anti-corrosion protective material, characterized by using a hole for fastening an anti-corrosion protective material and fastening with bolts and nuts.

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