JP5997986B2 - Structural member, method for manufacturing structural member, and method for reinforcing structural member - Google Patents

Description

  The present invention relates to a structural member used for a structure such as a construction, a method for manufacturing the structural member, and a reinforcing method.

Conventionally, steel materials have been used as structural members used in structures such as anchor bars used in bridges.
In recent years, there has been a demand for weight reduction of structural members, but since the design strength of the structural members does not change, it is difficult to reduce the weight of steel structural members.

  In view of such a situation, a structural member made of fiber reinforced resin, preferably a structural member made of carbon fiber reinforced resin having a high specific strength and high specific modulus has attracted attention (for example, see Patent Document 1).

Japanese Patent No. 2681553

  However, since the carbon fiber reinforced resin is expensive, the cost increases when all the structural members are made of carbon fiber reinforced resin.

  This invention is made | formed in view of the situation mentioned above, makes it an example of a subject to solve the above problems, and is a structural member and a structural member which can solve these subjects. It aims at providing the manufacturing method and the reinforcement method of a structural member.

The structural member according to the present invention includes a metal base material and a carbon fiber sheet in which bundles of carbon fibers arranged in a predetermined direction are arranged, a reinforcing layer attached to the base material, the reinforcing layer, and the An electrolytic corrosion preventing layer which is attached between the base material and prevents electrolytic corrosion of the base material due to a potential difference between the reinforcing layer and the base material.
The structural member according to the present invention is characterized in that an axial direction of the base material and a predetermined direction of the bundle of carbon fibers are parallel.
Further, the structural member according to the present invention is characterized in that a bundle of carbon fibers arranged in a direction intersecting a predetermined direction of the bundle of carbon fibers is attached to the opposite side of the base material of the reinforcing layer. To do.
The structural member according to the present invention is characterized in that the electrolytic corrosion prevention layer is made of a prepreg made of only glass fiber or resin.
The method for producing a structural member according to the present invention includes an electrolytic corrosion prevention step in which an electrolytic corrosion prevention sheet for preventing electrolytic corrosion of the base material is disposed on a metal base material constituting the structural member, and is attached to the structural member. A reinforcing step of disposing a carbon fiber sheet in which bundles of carbon fibers arranged in a predetermined direction are arranged on a side opposite to the base material of the electrolytic corrosion prevention sheet, and the carbon fiber sheet and the electrolytic corrosion prevention sheet. And a heating step of heating integrally with the base material.
Moreover, the manufacturing method of the structural member which concerns on this invention is a pressurization process which pressurizes the said carbon fiber sheet and the said electrolytic corrosion prevention sheet to the said base material side integrally between the said reinforcement process and the said heating process. It is characterized by having.
Further, in the method of manufacturing a structural member according to the present invention, in the reinforcing step, the carbon fiber sheet is formed so that a predetermined direction in which the carbon fibers of the carbon fiber sheet are arranged is parallel to an axial direction of the base material. It is arranged on a base material.
Further, the structural member reinforcing method according to the present invention is an electrolytic method in which an electrolytic corrosion prevention sheet for preventing electrolytic corrosion of the base material is disposed at a location where the cross section of the metal base material constituting the structural member is insufficient or where the cross section is damaged. A reinforcing step of disposing a carbon fiber sheet in which bundles of carbon fibers arranged in a predetermined direction are arranged on a side opposite to a cross-section shortage location or a cross-section damage location of the base material of the electrolytic corrosion prevention sheet; A pressing step of integrally pressing the carbon fiber sheet and the electrolytic corrosion prevention sheet toward the base material; a heating step of heating the carbon fiber sheet and the electrolytic corrosion prevention sheet integrally with the base material; It is characterized by having.

  The structural member is attached between a reinforcing layer composed of a metal base material, a carbon fiber sheet in which bundles of carbon fibers arranged in a predetermined direction are arranged, and the reinforcing layer and the base material. Since the electrolytic corrosion preventing layer for preventing electrolytic corrosion is provided, the weight can be reduced and the increase in cost can be suppressed. Furthermore, electrolytic corrosion of the base material can be prevented by the electrolytic corrosion prevention layer, and shortening of the product life can be suppressed.

(A) is a perspective view of the anchor bar as a structural member, (b) is a top view for demonstrating the structure of the anchor bar of Fig.1 (a). It is the schematic for demonstrating the condition where the anchor bar of FIG. 1 is used. It is explanatory drawing for demonstrating the manufacturing method of the anchor bar of FIG. (A) is a perspective view of a steel pipe as a structural member, (b) is an end view of FIG. 4 (a). It is a perspective view showing the aspect of the structural member in other embodiment. It is a perspective view showing the aspect of the structural member in other embodiment. It is a perspective view showing the aspect of the structural member in other embodiment. It is a perspective view showing the aspect of the structural member in other embodiment. It is a perspective view showing the aspect of the structural member in other embodiment. It is explanatory drawing for demonstrating the reinforcement method of the structural member which concerns on this invention.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, an example in which a structural member according to the present invention is applied to an anchor bar 1 as a bridge fall prevention structure, a lateral displacement restraining structure, or a displacement limiting device will be described. The anchor bar 1 is bonded to the base material 11, the electrolytic corrosion prevention layer 12 bonded to the base material 11, the first reinforcing layer 13 bonded to the electrolytic corrosion prevention layer 12, and the first reinforcing layer 13. The second reinforcing layer 14 and the fixing layer 15 provided on the second reinforcing layer 14.

  The base material 11 is composed of a steel rod having a circular cross section with a diameter of 25 mm, and functions as a core material of the anchor bar 1.

  The electrolytic corrosion prevention layer 12 is made of a glass fiber prepreg having a thickness of several millimeters. The electrolytic corrosion prevention layer 12 is wound and integrated in a part of the length direction of the base material 11 to be integrated. As a result, only one end of the base material 11 is exposed. The exposed side is inserted into the bridge girder B2, and the side not exposed and covered with the electrolytic corrosion prevention layer 12 is embedded in the bridge pier B1 (see FIG. 2).

  The first reinforcing layer 13 has a thickness of several millimeters and is made of a prepreg in which a bundle of carbon fibers arranged in one direction is impregnated with an epoxy resin and reacted in a semi-cured state. In the present embodiment, the carbon fiber content of the carbon fiber prepreg constituting the first reinforcing layer 13 is about 60%, and the carbon fiber diameter is about 7 microns.

  The first reinforcing layer 13 is wound around the base material 11 so that both ends of the electrolytic corrosion prevention layer 12 are exposed from above the electrolytic corrosion prevention layer 12. In the present embodiment, the end of the electrolytic corrosion prevention layer 12 that is not covered with the base material 11, that is, the end portion that is embedded in the pier B 1 is exposed about 5 mm in the axial direction of the base material 11. The other end is exposed about 5 to 10 cm.

  Further, the carbon fibers constituting the first reinforcing layer 13 are tensions acting on the base material 11 when a load in a direction parallel to the axis of the base material 11, that is, a direction orthogonal to the axial direction of the base material 11 is applied. It is directed in the direction of force and compressive force (0 ° direction with respect to the axial direction of the base material 11). The cross-sectional area and the cross-sectional shape of the carbon fiber prepreg constituting the first reinforcing layer 13 are appropriately set according to the maximum bending moment acting on the anchor bar 1.

  The second reinforcing layer 14 has a thickness of several millimeters and is made of a prepreg in which a bundle of carbon fibers arranged in one direction is impregnated with an epoxy resin and reacted in a semi-cured state. In the present embodiment, the carbon fiber content of the carbon fiber prepreg constituting the second reinforcing layer 14 is approximately 60%, and the carbon fiber diameter is approximately 7 microns.

  The second reinforcing layer 14 is wound around the base material 11 from above the first reinforcing layer 13 and completely covers the first reinforcing layer 13. That is, the length of the 1st reinforcement layer 13 and the length of the 2nd reinforcement layer 14 are the same.

  The carbon fibers constituting the second reinforcing layer 14 are carbon in the first reinforcing layer 13 when a load is applied in a direction orthogonal to the axis of the base material 11, that is, in a direction orthogonal to the axial direction of the base material 11. The direction in which the fibers are easily scattered (easy to be decomposed) (90 ° direction with respect to the axial direction of the base material 11) is directed. The cross-sectional area and cross-sectional shape of the carbon fiber prepreg constituting the second reinforcing layer 14 are appropriately set according to the maximum bending moment acting on the anchor bar 1.

  The fixing layer 15 is a portion embedded in the hole h1 provided from the upper surface of the pier B1 in the future, and a portion of the second reinforcing layer 14 embedded in the hole h1 is formed of a predetermined fiber member such as a peel ply. It is formed by performing a predetermined process. As a result, the surface becomes rough and the friction coefficient becomes high, so that the adhesion with the mortar m filled in the hole h1 is increased, and the anchor effect is increased (see FIG. 2).

  As shown in FIG. 2, when the anchor bar 1 is used for the bridge B, the anchoring layer 15 of the anchor bar 1 is embedded in the bridge pier B1, and the portion protruding from the bridge pier B1 of the anchor bar 1 is provided in the bridge girder B2. It will be inserted into the hole h2. As a result, the anchor bar 1 functions as a bridge B fall-off prevention structure, a lateral displacement restraining structure, or a displacement limiting device. Here, for example, when the bridge beam B <b> 2 moves in the horizontal direction, the bridge beam B <b> 2 applies a load to the anchor bar 1, and a bending moment (tensile force and compression force) acts on the cross section of the anchor bar 1.

  If the anchor bar 1 does not include the first reinforcing layer 13, the cross-sectional shape of the base material 11 must resist the tensile force and the compressive force, but the direction of the carbon fibers related to the first reinforcing layer 13 is the tensile force. Since the first reinforcing layer 13 is provided so as to be substantially parallel to the direction of the compressive force, and the first reinforcing layer 13 is disposed with respect to the tensile force and the compressive force, the cross section of the base material 11 is reduced. Can do. As a result, the base material 11 can be reduced in weight, and the anchor bar 1 can be easily installed. Further, the excavation length and the excavation diameter of the holes h1 and h2 provided in the pier B1 and the bridge girder B2 are reduced, and the amount of mortar to be filled in the hole h1 of the pier B1 can be reduced. Furthermore, it is possible to suppress an increase in cost by configuring the anchor bar 1 not with carbon fibers but with the steel base material 11 and the first reinforcing layer 13 of the carbon fiber prepreg.

  An electrolytic corrosion prevention layer 12 made of glass fiber prepreg is interposed between the steel base material 11 and the first reinforcing layer 13 and second reinforcing layer 14 made of carbon fiber prepreg, and the base material 11 and Since the 1st reinforcement layer 13 and the 2nd reinforcement layer 14 are interrupted | blocked, the electrolytic corrosion of the base material 11 by an electrical potential difference can be prevented, and the shortening of the product life of the anchor bar 1 can be suppressed.

  Furthermore, the 2nd reinforcement layer 14 comprised by the prepreg of the carbon fiber arrange | positioned in the direction orthogonal to the direction of the carbon fiber which comprises the 1st reinforcement layer 13 has covered the perimeter on the 1st reinforcement layer 13 Therefore, it is possible to prevent and reinforce the carbon fibers constituting the first reinforcing layer 13 due to deformation of the anchor bar 1 due to a bending moment or the like.

  The end of the anchor bar 1 on the side embedded in the bridge girder B2 is lower than the central portion in the length direction even when a bending moment is applied. Therefore, the first reinforcing layer 13 is not attached to the end, and the mother By enabling the bending moment to be resisted only by the material 11, the amount of the carbon fiber prepreg constituting the first reinforcing layer 13 can be reduced, and the product cost can be suppressed.

  In the present embodiment, a steel material having a circular cross section is used as the core material of the anchor bar 1, but the cross sectional shape of the base material 11 is not limited to this, and a polygon such as an ellipse or a triangle, or a star shape. Etc. Further, in the fixing layer 15, in order to further increase the friction coefficient, it is possible to provide a spiral, vertical or horizontal protrusion.

  Next, the manufacturing method of the anchor bar 1 in a factory etc. is demonstrated using FIG. First, as shown in FIGS. 3A and 3B, the anchor bar 1 to be manufactured is configured, and the electrolytic corrosion prevention layer 12 is configured at a predetermined position of the blasted base material 11. The sheet-like glass fiber prepreg to be wound is directly wound (electrolytic corrosion prevention process). Note that the axial length of the base material 11 of the glass fiber prepreg is set to be longer than the axial length of the base material 11 of the first reinforcing layer 13 set in advance based on the maximum bending moment acting.

  Next, as shown in FIG. 3C, the sheet-like carbon fiber constituting the first reinforcing layer 13 so that both ends of the electrolytic corrosion prevention layer 12 are exposed at predetermined positions of the electrolytic corrosion prevention layer 12. Wrap the prepreg (reinforcing process). Here, the carbon fiber prepreg constituting the first reinforcing layer 13 is formed on the base metal 11 from above the electrolytic corrosion prevention layer 12 so that the direction of the fiber and the axis (length) direction of the base material 11 are parallel to each other. Wrap around. Further, a sheet-like carbon fiber prepreg constituting the second reinforcing layer 14 is wound around a predetermined portion of the first reinforcing layer 13 so as to coincide with both ends of the first reinforcing layer 13 (reinforcing step). Here, the prepreg of the carbon fiber constituting the second reinforcing layer 14 is formed of the first reinforcing layer 13 so that the direction of the fiber and the axial direction of the base material 11, in other words, the fiber direction of the carbon fiber are orthogonal to each other. It is wound around the base material 11 from above.

  Next, as shown in FIG. 3D, in order to form the fixing layer 15 on the second reinforcing layer 14, a predetermined range such as a peel ply 5 is formed within a range where the fixing layer 15 is formed in the second reinforcing layer 14. Wrap the fiber member.

  Next, the electrolytic corrosion prevention layer 12, the first reinforcing layer 13, the second reinforcing layer 14, and the peel ply 5 are integrally pressed toward the base material 11 (pressurizing step). Specifically, as shown in FIG. 3 (e), the electrolytic corrosion prevention layer 12, the first reinforcement layer 13, the first reinforcement layer 13, and the taping 6 having a width shorter than the axial length of the base material 11 such as the second reinforcement layer 14. The first reinforcing layer 13, the second reinforcing layer 14, and the peel ply 5 are fastened to the base material 11 while being spirally pressed in the substantially circumferential direction of the base material 11. As a result, the base material 11, the electrolytic corrosion prevention layer 12, the first reinforcing layer 13, the second reinforcing layer 14, and the peel ply 5 are firmly integrated.

  Next, although not shown, the base material 11, the electrolytic corrosion prevention layer 12, the first reinforcing layer 13, the second reinforcing layer 14, and the peel ply 5 integrated by the pressing process are heated as a whole (heating process). ). Specifically, the base material 11 integrated with the electrolytic corrosion prevention layer 12, the first reinforcing layer 13, the second reinforcing layer 14, and the peel ply 5 is put into a heatable pot such as an autoclave, and the anchor bar 1 is heated overall. As a result, the base material 11, the electrolytic corrosion prevention layer 12, the first reinforcing layer 13, the second reinforcing layer 14, and the peel ply 5 are firmly integrated.

  When the heat treatment is completed, as shown in FIG. 3 (f), the taping 6 is removed, and the peel ply 5 is peeled off to form the fixing layer 15 with respect to the predetermined range of the second reinforcing layer 14. 1 is completed.

  Although the anchor bar 1 is manufactured as described above, the manufacturing method uses the base material 11 as a mold and does not require a dedicated mold that is used only for manufacturing the anchor bar 1. And the manufacturing process can be shortened. Furthermore, since the first reinforcing layer 13 is made of a carbon fiber prepreg and wound around the entire circumference of the base material 11, the edge of the first reinforcing layer 13 is not cut in the circumferential direction of the base material 11. As a result, the anchor bar 1 manufactured by the manufacturing method can resist the tensile force and the compressive force evenly in the circumferential direction.

  Further, when the electrolytic corrosion prevention layer 12 is formed, it is sufficient that the end portion of the base material 11 inserted into the bridge beam B2 is exposed to the same extent as the end portion inserted into the pier B1. Since the base material 11 is exposed to the inside, it is finally necessary to perform anticorrosion treatment. In the electrolytic corrosion prevention step, the anticorrosion treatment is also performed by forming the electrolytic corrosion prevention layer 12 to the end. become. Thereby, the manufacturing process of the anchor bar 1 can be shortened.

  In addition, a pressurizing process and a heating process can also be performed simultaneously with a pressurizable pot such as an autoclave. Furthermore, a heating process may be performed using a predetermined heating tool, such as heating a silicon rubber heater or the like covering the entire electrolytic corrosion prevention layer 12, the first reinforcing layer 13, the second reinforcing layer 14, and the peel ply 5. it can. In addition, each prepreg constituting the electrolytic corrosion prevention layer 12 to the second reinforcing layer 14 may be formed in a predetermined length by winding a roll-shaped prepreg around the base material 11 and cutting it at a desired position. The sheet-like prepreg formed in the above may be wound around or pasted on the base material 11.

(Embodiment 2)
Next, an example in which the structural member according to the present invention is applied to the steel pipe 2 will be described. As shown in FIG. 4, the steel pipe 2 includes a base material 21 that forms the base of the steel pipe 2, an electrolytic corrosion prevention layer 22 attached to the base material 21, and a base material 21 attached from above the electrolytic corrosion prevention layer 22. The first reinforcing layer 23 integrated with the first reinforcing layer 23, the second reinforcing layer 24 attached to the base material 21 from the top of the first reinforcing layer 23, and the base attached to the base of the second reinforcing layer 24. The third reinforcing layer 25 integrated with the material 21 and the fourth reinforcing layer 26 attached from above the third reinforcing layer 25 and integrated with the base material 21 are included. The steel pipe 2 is manufactured in the same manner as the anchor bar 1.

  The base material 21 is a tubular steel material having a length L <b> 1 having a cross-section of a rectangular shape, and the thickness of the cross section is constant in the circumferential direction and the length direction of the base material 21.

  The electrolytic corrosion prevention layer 22 is composed of a resin prepreg having a length L 2 shorter than the length L 1 of the base material 21. The prepreg is wound and bonded around the entire circumference along the cross-sectional shape of the base material 21 in the circumferential direction of the base material 21.

  Each of the first reinforcing layer 23 to the third reinforcing layer 25 has a thickness of several millimeters and is made of a prepreg in which a bundle of carbon fibers arranged in one direction is impregnated with an epoxy resin and reacted in a semi-cured state. . In the present embodiment, the carbon fiber content of the prepreg of carbon fibers constituting the first to third reinforcing layers 23 to 25 is about 60%, and the diameter of the carbon fibers is about 7 microns.

  The prepreg constituting the first reinforcing layer 23 is wound over the entire circumference along the cross-sectional shape of the electrolytic corrosion prevention layer 22 wound around the base material 21 in the circumferential direction of the base material 21 from above the electrolytic corrosion prevention layer 22. It is glued. The length L <b> 2 of the electrolytic corrosion prevention layer 22 is about 1 to 2 cm longer than the length L <b> 3 of the first reinforcement layer 23, and both ends of the electrolytic corrosion prevention layer 22 are exposed to the same extent from both ends of the first reinforcement layer 23. Thus, the electrolytic corrosion prevention layer 22 is exposed from both ends of the first reinforcing layer 23, so that the electrolytic corrosion due to the potential difference of the base material 22 can be reliably prevented.

  The prepreg constituting the second reinforcing layer 24 is wound over the entire circumference along the cross-sectional shape of the first reinforcing layer 23 wound around the base material 21 in the circumferential direction of the base material 21 from above the first reinforcing layer 23. It is glued. The length L4 of the second reinforcement layer 24 is about 30 cm shorter than the length L3 of the first reinforcement layer 23, and both end portions of the first reinforcement layer 23 are exposed from both ends of the second reinforcement layer 24 to the same extent.

  The prepreg constituting the third reinforcing layer 25 is wound over the entire circumference along the cross-sectional shape of the second reinforcing layer 24 wound around the base material 21 in the circumferential direction of the base material 21 from above the second reinforcing layer 24. It is glued. The length L5 of the third reinforcing layer 25 is about 30 cm shorter than the length L4 of the second reinforcing layer 24, and both end portions of the second reinforcing layer 24 are exposed to the same extent from both ends of the third reinforcing layer 25.

  The carbon fibers constituting the first reinforcing layer 23 to the third reinforcing layer 25 are aligned in parallel in substantially one direction. The carbon fibers of the first reinforcing layer 23 to the third reinforcing layer 25 integrated with the base material 21 have a load in a direction parallel to the axis of the base material 21, that is, a direction orthogonal to the axial direction of the base material 21. The direction of the tensile force and the compressive force acting on the cross section of the base material 21 when acting (the direction of 0 ° with respect to the axial direction of the base material 21) is directed. The resistance force against the tensile force and the compressive force of the first reinforcing layer 23 to the third reinforcing layer 25 is calculated based on the cross-sectional area and the cross-sectional shape of the carbon fiber prepreg included in the first reinforcing layer 23 to the third reinforcing layer 25 Therefore, these cross-sectional areas and cross-sectional shapes are appropriately set according to the tensile force and compressive force acting on the steel pipe 2.

  The fourth reinforcing layer 26 has a thickness of several millimeters and is made of a prepreg in which a bundle of carbon fibers arranged in one direction is impregnated with an epoxy resin and reacted in a semi-cured state. The length L5 of the fourth reinforcement layer 26 is about 30 cm shorter than the length L4 of the third reinforcement layer 25, and the fourth reinforcement layer 26 has the same degree of both ends of the third reinforcement layer 25 from above the third reinforcement layer 25. It is bonded in a state where the entire circumference of the third reinforcing layer 25 is covered over the entire length so as to be exposed.

  The carbon fibers constituting the fourth reinforcing layer 26 are aligned in parallel in substantially one direction. The carbon fibers of the fourth reinforcing layer 26 integrated with the base material 21 are perpendicular to the axis of the base material 21, that is, the first reinforcing layer 23 to the third reinforcing layer 25 integrated with the base material 21. The carbon fiber is oriented in the direction in which it is easy to disperse (decompose easily) (90 ° direction with respect to the axial direction of the base material 21).

  As described above, the directions of the carbon fibers of the first reinforcing layer 23 to the third reinforcing layer 25 of the steel pipe 2 are parallel to the axial direction of the base material 211. Therefore, when a force perpendicular to the axial direction acts on the steel pipe 2, the first reinforcing layer 23 to the third reinforcing layer 25 resist the tensile force and the compressive force acting on the steel pipe 2. Here, since the tensile strength and compressive strength of the carbon fibers of the first reinforcing layer 23 to the third reinforcing layer 25 are strong, the cross-sectional area and the cross-sectional shape of the base material 21 are the same as those of the first reinforcing layer 23 to the third reinforcing layer 25. It is desirable to design in consideration of tensile strength and compressive strength. This is because the cross-section of the base material 21 can be reduced to reduce the weight of the base material 21.

  Specifically, it is desirable to design the cross-sectional shape of the base material 21 so that it can resist the minimum bending moment (shearing force) acting on the steel pipe 2. In this case, if a bending moment greater than the minimum bending moment acts on the base material 21, the first reinforcing layer 23 to the third reinforcing layer 25 will bear the amount exceeding the minimum bending moment. Therefore, the first reinforcing layer 23 to the third reinforcing layer 25 can resist the tensile force and the compressive force based on the amount obtained by subtracting the minimum bending moment borne by the base material 21 from the maximum bending moment that can act on the base material 21. In addition, the cross-sectional areas and cross-sectional shapes of the first reinforcing layer 23 to the third reinforcing layer 25 may be set as appropriate. In this way, the base material 21 and the first reinforcing layer 23 to the third reinforcing layer 25 may be designed so as to meet the allowable range of the bending moment (tensile force and compressive force) acting on the base material 21.

  Here, with respect to the maximum bending moment, the shortage of the base material 21 is compensated by the first reinforcing layer 23 to the third reinforcing layer 25, but the maximum bending moment that can be generated is the length direction of the steel pipe 2. Depends on the position with respect to. Specifically, the maximum bending moment is the highest at the center in the length direction of the base material 21 and decreases as it goes to the end. Therefore, the tensile strength and compressive strength based on the carbon fibers of the first reinforcing layer 23 to the third reinforcing layer 25, that is, the cross-sectional areas of the first reinforcing layer 23 to the third reinforcing layer 25 are also the center in the length direction of the base material 21. If it sets so that it may decrease toward an end from a part, the efficiency improvement of the cross-sectional design of the steel pipe 2 can be aimed at. As an example, the base material 21 is laminated stepwise toward the center in the length direction, like the first reinforcing layer 23 to the third reinforcing layer 25. As a result, the amount of carbon fiber can be suppressed, and an increase in product cost can be suppressed. In particular, since carbon fiber prepregs are expensive, it is effective to suppress an increase in product cost. However, the structure of the reinforcing layer attached to the base material 21 is not limited to this, and can be configured as a single layer based on the maximum bending moment. In this case, a manufacturing process can be reduced compared with the case where it laminates in steps.

  Similarly to the first embodiment, an electrolytic corrosion prevention layer 22 made of a resin prepreg is interposed between the first reinforcing layer 23 and the base material 21, and the first reinforcing layer 23, the base material 21, Therefore, the electrolytic corrosion due to the potential difference between the steel base material 21 and the first reinforcing layer 23 to the fourth reinforcing layer 26 of carbon fiber can be prevented. Further, a fourth reinforcing layer 26 composed of carbon fibers oriented in a direction perpendicular to the direction of the carbon fibers constituting the first reinforcing layer 23 to the third reinforcing layer 25 is wound around the third reinforcing layer 25 and is wound around the entire circumference. Moreover, since it is bonded, it is possible to prevent the carbon fibers constituting the first reinforcing layer 23 to the third reinforcing layer 25 from being separated (decomposed) due to deformation of the steel pipe 2 due to a bending moment or the like. In the present embodiment, the length L5 of the fourth reinforcing layer 26 is shorter than the length L4 of the third reinforcing layer 25, and the volume of the fourth reinforcing layer 26, that is, the amount of carbon fiber prepreg is suppressed. Therefore, an increase in product cost can be suppressed.

  In addition, the steel pipe 2 of this Embodiment is manufactured by the method similar to the manufacturing method of the anchor bar 1 shown in FIG. That is, the electrolytic corrosion prevention layer 22, the first reinforcing layer 23 to the third reinforcing layer 25, and the fourth reinforcing layer 26 are each integrated by winding a sheet-like prepreg around the entire circumference of the base material 21. Yes. Thus, by forming the electrolytic corrosion prevention layer 22, the first reinforcing layer 23 to the third reinforcing layer 25, and the fourth reinforcing layer 26 with a sheet-like prepreg, there is no break in the circumferential direction of the base material 21, and the base Deterioration of the material 21 and the like can be prevented. Further, even if the first reinforcing layer 23 to the third reinforcing layer 25 have a bent portion in the cross-sectional shape as in the present embodiment, the edge of the base material 21 is not cut in the circumferential direction. In the bent portion, a resistance force against the tensile force and the compressive force is generated, so that the tensile force resistance function and the compressive force resistance function of the first to third reinforcing layers 23 to 25 as a whole can be enhanced.

(Other embodiments)
In the first embodiment and the second embodiment, the first reinforcing layers 13 and 23 and the like relating to the reinforcing layer of the structural member of the present invention are wound around the base materials 11 and 12 via the electrolytic corrosion prevention layers 12 and 22. The base materials 11 and 21 are integrated by pressurization and heating. For example, the base materials 11 and 21 and the first reinforcing layers 13 and 23 can be integrated with a predetermined adhesive. It is. That is, it is possible to integrate the base materials 11 and 21 and the first reinforcing layers 13 and 23 with an adhesive, and to prevent electrolytic corrosion due to a potential difference.

  Further, in the second embodiment, the first reinforcing layer 23 to the third reinforcing layer 25 and the like are made of a sheet-like carbon fiber prepreg and are wound around the base material 21 and the like in the circumferential direction, as shown in FIG. In this way, the carbon fiber reinforced plastic plate molded to a predetermined length with the width of each outer surface of the base material 21 can be attached and integrated with a predetermined adhesive. That is, a plurality of carbon fiber reinforced plastic plates can be continuously arranged in the circumferential direction of the base material 21. In addition, as shown in FIG. 6, a carbon fiber reinforced plastic plate molded to a width narrower than the width of each outer surface of the base material 21 is pasted with a predetermined adhesive, and a predetermined interval with respect to the circumferential direction of the base material 21. It is also possible to arrange them side by side intermittently.

  Moreover, as shown in FIG. 7, a carbon fiber reinforced plastic plate can be attached to only a part of the surfaces as a first reinforcing layer 23 to a third reinforcing layer 25 with a predetermined adhesive. In particular, since the amount of deformation is small in the case of steel like the base material 21, the first is focused only on a range where a tensile force and a compressive force exceeding a predetermined value are generated in consideration of the position where the force acts. The reinforcing layer 23 can also be attached. Thereby, the quantity of a carbon fiber reinforced plastic board can be reduced and the increase in the cost of a structural member can be suppressed. Furthermore, the first reinforcing layer 23 to the third reinforcing layer 25 attached to the bottom surface are made wider than the first reinforcing layer 23 to the third reinforcing layer 25 attached to the top surface to increase the amount of the carbon fiber reinforced plastic plate. You can also

  Further, the structure of the fourth reinforcing layer 26 is not limited to the second embodiment, and as shown in FIG. 8, a plurality of the fourth reinforcing layers 26 are configured, and a predetermined interval is provided in the length direction of the base material 21. It can also be arranged side by side. Furthermore, the fourth reinforcing layer 26 may be made of a material other than the prepreg of carbon fiber. In this case, it is only necessary to prevent the carbon fibers of the first to third reinforcing layers 23 to 25 from being scattered.

  Further, when the base material 21 has a hollow structure as in the second embodiment, as shown in FIG. 9, the electrolytic corrosion prevention layer 22, the first reinforcing layer 23 to the third reinforcing layer 25 are formed on the inner surface of the base material 21. It is also possible to attach. In this case, the electrolytic corrosion prevention layer 22 and the first reinforcing layer 23 to the third reinforcing layer 25 can be prevented from being damaged due to wear or tear, and the shortening of the product life can be suppressed. It is also possible to attach the electrolytic corrosion prevention layer 22 and the first reinforcing layer 23 to the third reinforcing layer 25 to both the outer surface and the inner surface of the hollow base material 21.

  For the steel pipe 2 shown in FIGS. 5 to 9, a predetermined adhesive constitutes the electrolytic corrosion prevention layer 22. Therefore, the electrolytic corrosion preventing layer 22 made of a predetermined adhesive is not exposed and coincides with the bottom surface of the first reinforcing layer 23.

  In the second embodiment, the first to third reinforcing layers 23 to 25 are made of the same carbon fiber prepreg, but may be made of carbon fiber prepregs having different characteristics. Further, it can be made of different materials. Further, in Embodiment Mode 1 and Embodiment Mode 2, the characteristics of the substances constituting each layer are not limited.

  Furthermore, in Embodiment 1 and Embodiment 2, as the carbon fiber of the reinforcing layer, the carbon fiber parallel to the length direction of the base materials 11 and 21 and the carbon fiber orthogonal to the base material are separated separately and attached as a reinforcing layer. However, carbon fibers in both directions can be included in a single reinforcing layer. Further, the directions of the carbon fibers of the second reinforcing layer 14 and the fourth reinforcing layer 26 are not limited to those of the first and second embodiments, and may be crossed with the axial directions of the base materials 11 and 21.

  Further, the shapes and forms of the base materials 11 and 21, the electrolytic corrosion prevention layers 12 and 22, and the reinforcing layers 13, 14, and 23 to 26 according to the structural member of the present invention are limited to the first embodiment and the second embodiment. I can't. Furthermore, in Embodiment 1 and Embodiment 2, although the structural member which concerns on this invention is applied to the structural member of a construction, it applies also to the structural member of things other than constructions, such as furniture, for example. It is possible. In addition, as the base materials 11 and 21, metals other than steel, for example, aluminum, can be used.

  Moreover, although Embodiment 1 demonstrated the manufacturing method of the structural member which concerns on this invention, the said manufacturing method can also be applied to the reinforcement method of the structural member already installed in the field etc., for example. For example, as shown in FIG. 10A, it is assumed that a base material 31 made of a steel bar has already been installed. Here, it is assumed that a part of the cross section is damaged due to corrosion or the like. In this case, the damaged portion K is first removed from the corrosion by polishing or the like.

  Next, as shown in FIG. 10B, a prepreg of glass fiber is wound around the damaged portion K to form the electrolytic corrosion prevention layer 32 (electrolytic corrosion prevention step). Next, as shown in FIG. 10C, the first reinforcing layer 33 and the second reinforcing layer 34 are formed at predetermined locations of the electrolytic corrosion prevention layer 32 (reinforcing step) as in the manufacturing method shown in FIG. .

  Next, as shown in FIG. 10D, the electrolytic corrosion preventing layer 32, the first reinforcing layer 33, and the second reinforcing layer 34 are integrally pressed against the base material 31 by the taping 6 (pressurizing step). .

  Next, as shown in FIG. 10 (e), a predetermined heating device is used, such as heating by covering the entire electrolytic corrosion prevention layer 32, the first reinforcing layer 33, and the second reinforcing layer 34 with the silicon rubber heater 7. Then, the entire range in which any of the second reinforcing layer 34, the first reinforcing layer 33, or the electrolytic corrosion preventing layer 32 is exposed is heated at once (heating step). As a result, the base material 11, the electrolytic corrosion prevention layer 12, the first reinforcing layer 13, and the second reinforcing layer 14 are firmly integrated.

  And as shown in FIG.10 (f), if the taping 6 is removed, the base material 31 will be reinforced.

  By reinforcing the existing structural member by such a method, it is not necessary to replace the structural member, so that the cost can be reduced. Note that the reinforcing method can be applied not only to a case where cross-sectional damage due to corrosion or the like occurs in the structural member, but also to a subsequent cross-sectional defect due to a laceration or a change in design load.

DESCRIPTION OF SYMBOLS 1 Anchor bar 2 Steel pipe 6 Taping 7 Silicon rubber heater 11, 21, 31 Base material 12, 22, 32 Electrolytic corrosion prevention layer 13, 23, 33 First reinforcement layer 14, 24, 34 Second reinforcement layer 15 Fixing layer 25 First 3 reinforcement layer 26 4th reinforcement layer

Claims (9)

A metal base material,
A carbon fiber sheet in which bundles of carbon fibers arranged in a predetermined direction are arranged, and a reinforcing layer attached to the base material,
A structural member, comprising: an electrolytic corrosion prevention layer which is attached between the reinforcing layer and the base material and prevents electrolytic corrosion of the base material due to a potential difference between the reinforcing layer and the base material.   The structural member according to claim 1, wherein an axial direction of the base material is parallel to a predetermined direction of the bundle of carbon fibers.   The structural member according to claim 2, wherein a bundle of carbon fibers arranged in a direction intersecting a predetermined direction of the bundle of carbon fibers is attached to the side of the reinforcing layer opposite to the base material.   The structural member according to any one of claims 1 to 3, wherein the electrolytic corrosion prevention layer is made of a prepreg made only of glass fiber or resin. An electrolytic corrosion prevention step of disposing an electrolytic corrosion prevention sheet for preventing electrolytic corrosion of the base material on a metal base material constituting the structural member;
A reinforcing step of disposing a carbon fiber sheet in which bundles of carbon fibers arranged in a predetermined direction are arranged on the side opposite to the base material of the electrolytic corrosion prevention sheet attached to the structural member;
And a heating step of heating the carbon fiber sheet and the electrolytic corrosion prevention sheet integrally with the base material. Between the reinforcing step and the heating step,
The method for manufacturing a structural member according to claim 5, further comprising a pressing step of pressing the carbon fiber sheet and the electrolytic corrosion prevention sheet integrally to the base material side.   6. The reinforcing step, wherein the carbon fiber sheet is arranged on the base material so that a predetermined direction in which the carbon fibers of the carbon fiber sheet are arranged is parallel to an axial direction of the base material. Or the manufacturing method of the structural member of 6.   A structural member manufactured by the method for manufacturing a structural member according to claim 5. An electrolytic corrosion prevention step of disposing an electrolytic corrosion prevention sheet for preventing electrolytic corrosion of the base material at a shortage section or a cross-section damage location of the metal base material constituting the structural member;
Reinforcing step of disposing a carbon fiber sheet in which bundles of carbon fibers arranged in a predetermined direction are arranged on the side opposite to the cross-sectional insufficient portion or cross-sectional damaged portion of the base material of the electrolytic corrosion prevention sheet;
A pressing step of integrally pressing the carbon fiber sheet and the electrolytic corrosion prevention sheet to the base material side;
And a heating step of heating the carbon fiber sheet and the electrolytic corrosion prevention sheet integrally with the base material.

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