JPH0378461B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Technical Field of the Invention The present invention relates to a method for reinforcing structural members such as reinforced concrete columns and beams. (b) Technical background For structural members such as reinforced concrete columns and beams, it is necessary to provide some method of reinforcement against shearing of the concrete. (c) Prior art and problems Figure 9 is a diagram showing a conventional method of reinforcing structural members, where a is a plan view, b is a front view, and Figure 10 is a diagram showing another conventional method of reinforcing structural members. and a is the plan view,
b is a front view. Conventionally, reinforcement of the structural member 3 has been carried out by reinforcing the hoop muscles 2, stirrup muscles, etc. in a ring shape (FIG. 9) or a spiral shape (FIG. 10), as shown in FIGS. 9 and 10.
(Fig.), but in either case, it was necessary to bend the bar-shaped reinforcing bars to match the arrangement of the main reinforcing bars 1, and this combined with the heavy weight of the steel made it difficult to reinforce the structural members 3. The work was difficult and time consuming for the workers. (d) Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a method for reinforcing structural members that has good workability and can perform reinforcing work easily and in a short time. . (e) Structure of the invention That is, the present invention provides a structure in which a plurality of main reinforcements are arranged.
In a structural member such as a column or a beam, a rope made of carbon fiber is stretched between the main reinforcing bars to reinforce the structural member. Further, the present invention provides a structure in which a plurality of main reinforcements are arranged.
In structural members such as columns and beams, ropes made of aramid fibers are stretched between the main reinforcing bars to reinforce the structural members. (f) Examples of the invention Examples of the invention will be described below based on the drawings. FIG. 1 is a diagram showing an embodiment of the method for reinforcing a structural member according to the present invention, in which a is a front view, b is a plan view, and FIG. 2 is a diagram showing another embodiment of the present invention, in which a is a front view. 3 is a diagram showing another embodiment of the present invention; FIG. 4 is a diagram showing a front view; FIG. 4 is a diagram showing another embodiment of the invention; a is a front view,
b is a plan view, FIG. 5 is a diagram showing still another embodiment of the present invention, a is a front view, b is a plan view, FIG. 6 is a diagram showing still another embodiment of the present invention, and a is a front view,
b is a plan view, FIG. 7 is a plan view showing still another embodiment of the invention, and FIG. 8 is a plan view showing still another embodiment of the invention. When pouring structural members 3 such as columns or beams, as shown in FIG. Streak. Next, high-performance continuous fibers such as carbon fibers and aramid fibers (named by the U.S. Federal Commerce Commission (FTC), such as Dupont's Kevlar (registered trademark) are known) The rope 5 is connected to the main reinforcement 1 along the outer periphery of the four main reinforcements 1.
The end of the rope 5 is tied to one of the four main reinforcements 1 with a bowline knot that will not unravel under tension. In this way, a plurality of ropes 5 are installed at predetermined intervals L, and when this is completed, concrete is poured to form the structural member 3.

[Table] Table 1 shows the mechanical properties of carbon fiber and aramid fiber as high-performance continuous fibers in comparison with copper.
As shown in Table 1, high-performance continuous fibers have a Young's modulus (modulus) comparable to that of copper, and their tensile strength is several times that of steel, but their density is 1/4 to 1/3 that of steel. Five
It is extremely lightweight and can sufficiently reinforce the structural member 3. (g) Effects of the Invention As explained above, according to the present invention, the rope 5 made of carbon fiber is lightweight and strong.
is wrapped around the main reinforcement 1 to form the structural member 3.
Since the structural member 3 is reinforced, the reinforcing work of the structural member 3 can be performed more easily and in a shorter time than the method of bending and wrapping reinforcing bars. In addition, since the rope 5 has the property of being easily bent,
There is no need for any special bending process that is required when using reinforcing bars, making handling easy and having extremely good workability. Further, the same effect can be obtained by using a rope made of aramid fiber instead of carbon fiber. In addition, in the above-mentioned embodiment, the rope 5 is simply the main reinforcement 1.
We have described the case where it is wrapped in a ring, but the second
As shown in the figure, the rope 5 may be wrapped around each main reinforcement 1 one or more times to ensure that the rope 5 is fixed to each main reinforcement 1.
As shown in the figure, the rope 5 may be wound spirally between the main reinforcements 1 (in the case of FIG. 4, the rope 5 is further wrapped around each main reinforcement 1 at least once). Furthermore, as shown in Figures 5 and 6, it is also possible to stretch the rope 5A between the main reinforcements 1 diagonally (in the case of Figure 6, the rope 5A can be stretched around each main reinforcement 1). (The main reinforcing bars 1 on the diagonal lines are connected by ropes 5A.) Furthermore, as shown in FIG. 7, even if the rope 5A is stretched in a diamond shape inside the loop-wound rope 5, as shown in FIG.
Of course, it is also possible to install A and 5B so that they partially overlap. That is, rope 5,5
As long as A and 5B can reinforce the main reinforcing bars 1 constituting the structural members 3 such as columns and beams, they can be stretched in any manner. Furthermore, as shear reinforcing bars not only for columns and beams but also for walls, etc., ropes made of carbon fibers or aramid fibers can be stretched between the main reinforcing bars constituting surrounding columns, beams, etc.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the method for reinforcing a structural member according to the present invention, in which a is a front view, b is a plan view, and FIG. 2 is a diagram showing another embodiment of the present invention, in which a is a front view. 3 is a diagram showing another embodiment of the present invention; FIG. 4 is a diagram showing a front view; FIG. 4 is a diagram showing another embodiment of the invention; a is a front view,
b is a plan view, FIG. 5 is a diagram showing still another embodiment of the present invention, a is a front view, b is a plan view, FIG. 6 is a diagram showing still another embodiment of the present invention, and a is a front view,
b is a plan view, FIG. 7 is a plan view showing still another embodiment of the present invention, FIG. 8 is a plan view showing still another embodiment of the present invention, and FIG. 9 is a conventional method for reinforcing structural members. In the drawings, a is a plan view, b is a front view, and FIG. 10 is a diagram showing another conventional reinforcement method for a structural member, a is a plan view, and b is a front view. 1...Main reinforcement, 3...Structural member, 5, 5A, 5B
……rope.

Claims (1)

[Claims] 1. In a structural member such as a column or beam in which a plurality of main reinforcing bars are arranged, the structural member is reinforced by stretching a rope made of carbon fiber so as to wrap it between the main reinforcing bars. A method for reinforcing a structural member, characterized in that: 2. In a structural member such as a column or beam in which a plurality of main reinforcing bars are arranged, a rope made of aramid fiber is stretched in a manner that is wrapped between the main reinforcing bars to reinforce the structural member. Characteristic method of reinforcing structural members.