JP3710853B2 - How to strengthen columnar objects - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a novel method for reinforcing an existing columnar object by providing a fiber reinforced plastic layer on the outer periphery of a columnar object, particularly a cylindrical object, which is a component of a building or a structure.
[0002]
[Prior art]
Conventionally, as a method of strengthening an existing columnar product of a building or a structure, a method of winding a reinforcing yarn containing a resin that cures at room temperature around the columnar product, and a method of sticking a reinforcing sheet impregnated with a thermosetting resin to the columnar product Etc. have been adopted.
[0003]
[Problems to be solved by the invention]
However, in the former method, a large-scale winding facility is required, and when the columnar object has an upper structure, it is impossible to wind up to the top. In the latter method, there is a problem in heating in the large area, and the manual application is mainly inefficient. An object of the present invention is to solve this conventional problem and to provide a method for strengthening a columnar object that does not require large-scale equipment and complicated work.
[0004]
[Means for Solving the Problems]
The present invention is a method for strengthening a columnar product in which a tape-shaped cured product having a reinforcing component in the longitudinal direction is wound around a columnar product in a spiral manner, and the tape-shaped cured product is fed out at one end of the columnar product to form a spiral cylinder. The above-mentioned problems are solved by a method for strengthening a columnar material that is grown and formed on the outer periphery of the columnar material.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a method for strengthening a columnar object according to the present invention, in which 1 is a columnar object to be reinforced and 2 has a reinforcing component mainly in the longitudinal direction. It is a tape-like cured product. This tape-like cured product is obtained by impregnating and curing a resin made of carbon fiber, glass fiber, or other high-strength / high-elastic yarn, and the fiber to be used, its form and resin are not particularly limited.
[0006]
Moreover, it is preferable that a tape-shaped hardened | cured material has a coupling | bonding structure couple | bonded with the other one side at least on the one side. That is, in FIG. 1, the cross section AA ′ of the tape-like cured product has a concave structure on one side of the tape-like cured product as shown in FIG. As shown in a 'of FIG. 2, it is fitted to the other side of the tape-like cured product. Similarly, b, c, and d in FIG. 2 have structures that are fitted to both sides of the tape-like cured product, and are in the fitted state of b ′, c ′, and d ′ in FIG. 2, respectively.
[0007]
In the present invention, such a bonded structure is not particularly limited, but a tape-like cured product is bonded as shown in FIG. 2, b, c or d, rather than the structure shown in FIG. However, a structure in which the cross-sectional area in the width direction of the tape-like cured product is constant or a structure in which the inside of the spiral structure is a plane is preferable.
[0008]
The tape-like cured product used in the present invention preferably has a certain degree of curvature in order to facilitate spiral winding. Such a curvature can be obtained by winding a tape around a drum slightly thicker than the cured product to be reinforced and curing the tape-shaped cured product.
[0009]
Further, as shown in the sectional view of FIG. 3, the structural change in the thickness direction of the tape-like cured product, for example, in the direction perpendicular to the paper surface in FIG. 3 (that is, the direction along the longitudinal direction of the tape-like cured product). By placing a sheet material having a lower elasticity than the reinforcing fiber indicated by the one-dot chain line 7 on one side of the tape-like cured product composed of the oriented high-strength and high-elastic reinforcing fibers 6, a component of the tape-cured product can be obtained. With the curing of a certain resin, a difference in shrinkage stress occurs between the front and back of the tape-like cured product, and a curvature with the low elastic sheet material side on the inside can be generated.
[0010]
The width of the tape-like cured product thus obtained should be determined by the diameter of the columnar material to be reinforced and the orientation angle of the reinforcing fibers with respect to the circumferential direction of the columnar material, but generally about 25 to 250 mm. This is reasonable considering the economy. However, the width is not limited.
[0011]
A preferred method of winding the tape-shaped cured product around the columnar body in the present invention will be described with reference to FIG. 1. The tape-shaped cured product 2 is fed out in the direction of arrow 3 by a method such as a feed roll (not shown), and is columnar. In order to form a spiral cylinder around the columnar object 1 with a diameter slightly larger than that of the object 1, fitting is performed by a joint structure on at least one side of the tape-shaped cured product 2 at point P. By continuously carrying out this process, the spiral cylinder grows in the upward direction of the columnar object while rotating in the direction of the arrow 4. At this time, the lowermost tape-like cured product can smoothly form the spiral cylinder up to the top of the columnar object by supporting means such as supporting the lower side 5 and assisting the rotation of the spiral cylinder. A large winding device like the technique is not necessary.
[0012]
The inner diameter of the spiral cylinder formed in this way is slightly larger than the outer diameter of the columnar object, and in order to strengthen the columnar object, a filler is pressed into this gap or the cylinder is squeezed (the tape-shaped cured product is By sliding the fitting portion in the longitudinal direction and reducing the diameter, it is possible to adjust the gap or generate tension in the orientation direction of the reinforcing fibers of the tape-like cured product.
[0013]
In the present invention, the relationship between the columnar material to be reinforced and the spiral cylinder (the presence or absence of fillers, adhesives and other inclusions, etc.) is not limited at all. It is also possible to form a spiral cylinder while adding an adhesive at point P. Further, a spiral cylinder can be formed while adding an adhesive having a relatively long gel time and an appropriate viscosity. Further, when the diameter of the spiral cylinder is reduced by using an adhesive having a relatively long gel time and an appropriate viscosity, there is an advantage that contributes to lubrication with the fitting portion and the columnar object.
[0014]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[0015]
(Example 1)
Using a unidirectional prepreg with a carbon fiber basis weight of 250 g / m ² and a 130 ° C cured epoxy resin content of 40%, a tape-shaped cured product having a width of 100 mm and a thickness of approximately 1.8 mm is prepared as shown in FIG. did. In the tape-like cured product, the depth of the concave portion was about 5 mm, the width was about 0.8 mm, the length of the convex portion was about 4.5 mm, and the thickness was about 0.6 mm. In addition, the tape-like cured product of the resin cured product in which the nylon taffeta is arranged on the lowermost layer of the cross section and the both sides (bonding structure part) of the tape-like cured product in this configuration has a diameter of about 60 mm. It had a curvature of 1.2m.
[0016]
On the other hand, eight guide rolls loosely fitted to the convex portions of the tape-like cured product were arranged at a position of about 10 mm in the outer periphery of a cylinder having a diameter of 1 m with a difference of 12 mm in height. Further, eight guide rolls for controlling the outer diameter of the spiral cylinder to be formed were provided at a height of 100 cm. Next, the convex portions of the tape-like cured product are sequentially fitted into the concave portions of the guide roll, and the point P shown in FIG. It was made to fit in the recessed part in the other side of the tape-shaped hardened | cured material in the lower stage, and fitting was temporarily fixed with the gummed tape. Thereafter, as shown in FIG. 1, the tape-shaped cured product was sent out toward the point P while paying attention to the fitting, so that a spiral cylinder made of the tape-shaped cured product could be formed at a position of about 10 mm on the outer periphery of the column. .
[0017]
(Example 2)
The spiral cylinder formed in the same manner as in Example 1 (but without using an adhesive in the concave portion of the tape-like cured product when the spiral cylinder is formed) is rotated in the opposite direction to that of the spiral cylinder, and sequentially from the top of the spiral cylinder. By reducing the diameter, the spiral cylinder could be brought into close contact with the column. In addition, an epoxy resin was applied to the fitting portion, and the fitting portion was fixed to enter the fitting portion by the action of the surface tension of the epoxy resin to fix the fitting portion.
[0018]
【The invention's effect】
According to the present invention, the reinforcing layer can be easily provided around the columnar object without using complicated equipment such as large-scale equipment and on-site heating.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing the columnar material strengthening method of the present invention.
FIG. 2 is a cross-sectional view showing examples of various bonded structures of the tape-like cured product used in the present invention.
FIG. 3 is a cross-sectional view of the tape-like cured product used in the examples of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Columnar thing 2 Tape-like hardened | cured material 3 Feeding direction 4 of tape-like hardened | cured material The rotation direction 5 of the cylinder at the time of helical cylinder formation The lower side 6 of the tape-shaped hardened | cured material of spiral cylinder formation 6 Reinforcement fiber 7

Claims (4)

  A method of strengthening a columnar product in which a tape-shaped cured product having a reinforcing component mainly in the longitudinal direction is spirally wound around a columnar product, wherein the tape-shaped cured product is fed out at one end of the columnar product, and the spiral cylinder is arranged on the outer periphery of the columnar product. A method for strengthening pillars that grow and form.  The method for reinforcing a columnar article according to claim 1, wherein a tape-like cured product having a coupling structure in which one side is coupled to one side is used.   The method for reinforcing a columnar article according to claim 1 or 2, wherein a tape-like cured product having a curvature is used.   The method for reinforcing a columnar article according to any one of claims 1 to 3, wherein tension is applied to the tape-like cured product by reducing the diameter of a spiral cylinder formed on the outer periphery of the columnar article.

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