JPS62244980A - Concrete structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to concrete structures, and more specifically to existing concrete structure parts such as columns and beams! This is about a concrete structure made of Ll cutting sleeves.

(Prior art) Conventionally, in order to impart earthquake resistance to existing concrete structures, materials such as steel plates, welded wire mesh, composites of metal and mortar, and in some cases composites of strips and epoxy resin have been used. Methods of applying shear reinforcement members have been proposed and implemented.

(Problem to be solved by the invention) However, when reinforcing the back side with conventional reinforcing members such as copper plates, it is essential to weld the copper plates on site, and the rank is limited to highly skilled and skilled workers. If you don't do it reliably, you won't be able to get the reinforcement of abuse.

In addition, mortar, etc., will be injected between the existing concrete structure S wing and the steel mesh, #pumped wire mesh, etc. in order to transfer stress, but the injected mortar, etc. will be filled tightly between these. Things were tough.

(Means for Solving the Problems) Therefore, in order to solve the drawbacks of the conventional methods, the inventor Tera has conducted intensive studies to solve the problems of the conventional rice milling, concrete IJ-tom construction, and bonded reinforcing members made of fiber-reinforced resin. The present inventors have discovered that the strength of a concrete structure can be sufficiently improved by winding the concrete structure.

That is, an object of the present invention is to provide a concrete structure with improved seismic strength.

And its purpose is to attach # to the outer periphery of concrete structural members.
A concrete structure comprising a reinforcing member made of fiber-reinforced resin, wherein the concrete structural member and the reinforcing member are in a layered state, and the sleeve EBi material is wrapped around the outer periphery of the concrete structural member. The concrete construction members used in the present invention, which are achieved by a concrete structure characterized by reinforcement, include ordinary existing concrete structures and conventional concrete structures.
J-Structure pillars, concrete structure pieces such as Song Dynasty are used. The reinforced concrete structure of the concrete ruins, which was designed and constructed by the Sui Dynasty for more than 6 years, has a large shear reinforcement effect because there are few reinforcing bars.

As the reinforcing member made of fiber-reinforced resin, a conventionally known fiber-reinforced resin can be used, but for example, a composite material made of resin reinforced with carbon fiber, glass fiber, etc. is more suitable in terms of its own weight. As for the fibers, those having particularly high strength and high elasticity are preferable because they have a great effect of suppressing the expansion of cracks that occur in concrete IJ-) construction members.

The resin is not particularly limited as long as it is a known resin used for fiber-reinforced resins, but epoxy resins are generally used.

In the present invention, a concrete structural member and a reinforcing member made of fiber-reinforced resin are reinforced each time in a fitted state. Specifically, an adhesive layer such as a primer, adhesive, or resin is applied to the outer peripheral surface of the concrete structural member. After preparing the surface, for example, reinforcements S and N made of long fiber reinforced resin may be wrapped around the outer wall of the concrete structural member to provide seismic reinforcement. In this case, the fibers may be coated or pre-impregnated with a resin, wound around the outer periphery of the concrete structural member, and then the resin may be cured.

In addition, there is a method in which resin is directly impregnated or coated with fibers and the resin is hardened by winding the outer circumferential surface of the concrete structural member without preparatory treatment, that is, concrete structure s4I
It would be better if there was at least some kind of resin layer intervening between the t and the fibers to improve adhesion.If the outer peripheral surface of the concrete structural member is prepared, the adhesion of the fibers to the concrete surface will be reduced. It is possible to extract the bearing strength of a concrete structure. This ζ
ζ On the other hand, if no surface treatment is performed, a part of the resin mixed or applied to the fibers will act as an adhesive, and will have a sufficient restraint effect as long as the cracks in the concrete structural member are small. When cracks or the like become large, the contact layer between the concrete structural member and the fibers breaks, and the strength of the fibers can be fully utilized, making it possible to improve the deformation of the concrete structure.

The primer is not particularly limited as long as it is a known primer, but it is generally preferable to use an epoxy-based primer.

Note that it is desirable that the outside of the concrete structure thus obtained be covered with any material for the purpose of protecting the reinforcing members and providing a decorative finish.

(Effects) According to the present invention, when carrying out shear reinforcement of existing concrete structural members, the strength of the reinforcing wings is fully utilized,
It is possible to improve the strength of the concrete structure and reduce violets in the reinforcing member, and it is possible to perform shear reinforcement at a lower cost than in the prior art.

Hereinafter, the present invention will be further described in detail with reference to Examples, but the present invention is not limited to the following Examples for the sake of convenience.

(Example/) Concrete IJ+ cylinders for testing were manufactured in a conventional manner in a size similar to the actual dimensions. A schematic diagram of this is shown in Figure 7.

1 of epoxy resin on the outer periphery of the concrete column for the above test.
After applying the primer and curing the primer, a carbon fiber strand (6000 filament) impregnated with room temperature curing epoxy resin is wrapped around the outer circumference in a helical shape while applying tensile force as a reinforcing layer, and the epoxy resin is applied at room temperature. The resin was cured, and a concrete cylinder for testing (test sea bream body A) was manufactured. The winding strength of the carbon fiber strands was set to 0.1% when converted to the #rebar ratio of the reinforcing bars.

As a comparative test specimen, test specimen B was a concrete cylinder for trial use that was the same as test specimen A except that no primer and reinforcing member were applied.

The results of the force test are shown in Table-/.

Test specimen A had approximately 10% higher yield strength and approximately twice the deformation strength compared to specimen B.

As a result of this comparative experiment, it was found that test specimen A, which had been subjected to surface treatment, had improved yield strength.

(Example 2) A test concrete IJ + G prism with the actual size was manufactured by a conventional method. An overview is shown in Figure 1. To apply the primer to the outer periphery of the above-mentioned concrete prism for testing, a room-temperature curing epoxy resin is directly wrapped around the outer periphery of the test concrete pillar in a helical shape while applying a tensile force. The epoxy resin was cured at room temperature to produce a concrete prismatic column for testing (test specimen C). Incidentally, the winding thickness of the carbon fiber strand was set to wl:, and as with test sample A, the winding ratio was 0.1-.

As a comparative test specimen, a concrete prismatic column for testing which was the same as the test specimen C except that the reinforcement 88 was not applied was used as the test specimen.

The results of the force test are shown in Table 1.

The yield strength of test specimen C was improved by about 20% compared to the test specimen, and the strength of the father-shaped lid was improved by about 6.3 times.

As a result of this comparative experiment, it was found that the deformability of test specimen C without any surface treatment was improved.

Table 7 Table 2 Explanation of the four sides Figure 7 is an overview of the concrete cylinder for testing, Figure 2 is an overview of the concrete square pillar for testing, and Figure 3 is a diagram of the strength of the reinforcement material wrapped around the cylinder. , FIG. 9 is a schematic view of the reinforcing member wrapped around the square column, FIG. 1 is an enlarged view of the circular column, and FIG. 6 is an enlarged view of the square column.

/, concrete λ, main bar 3. Stirrup 岨 Loading device mounting part ! , Soap part 6. Reinforcement member Otsu Primer Sender: Mitsubishi Chemical Industries, Ltd. Representative Patent Attorney *For table − (7 others) Figure 1 Man 3 figure Kojiro 4 pieces of straw First birthday

Claims (1)

[Claims] (1) A concrete structure in which a reinforcing member made of fiber-reinforced resin is applied to the outer periphery of a concrete structural member, the reinforcing member being attached to the outer periphery of the concrete structural member with the concrete structural member and the reinforcing member bonded together. A concrete structure characterized by being reinforced by winding.