JPS60119848A - Fiber reinforced concrete and its constructin - 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 The present invention relates to fiber-reinforced concrete that reinforces the tensile strength of concrete and its construction method.

Conventionally, reinforced concrete with reinforced tensile strength has been known, such as reinforced concrete with reinforcing bars or fiber-reinforced concrete with fibers such as glass fiber and carbon fiber, but in the case of reinforced concrete, durability due to rust In addition, it is difficult to bend and arrange reinforcing bars, resulting in poor workability and weight, and in the case of fiber-reinforced concrete, each fiber is mixed discontinuously into the concrete. This has the disadvantage that the stress applied to the concrete is difficult to be transmitted to the entire concrete, and the tensile strength cannot be sufficiently reinforced.

The purpose of the present invention is to provide a fiber-reinforced concrete that does not have these disadvantages, and is made by applying a hydrophilic curable binder to the surface of a reinforcing material made of braided fibers with high tensile strength. Particularly, the second invention of the present application is characterized in that it is coated and placed in concrete.It is an object of the present invention to provide a construction method that improves the workability of the fiber reinforced concrete. A reinforcing material made by knitting fibers with high tensile strength into a braided cord.After applying a curable binder having total hydrophilic properties, the binder is semi-hardened to an extent that allows plastic deformation such as bending of the reinforcing material. It is characterized in that it is placed at a desired position in a state in which concrete is poured.

One embodiment of the present invention will be described below with reference to the accompanying drawings.

The illustrated example shows an example in which the fiber-reinforced concrete of the present invention is used to construct a columnar concrete structure (1).

As shown in Figures 1 and 2, the concrete structure (1) is constructed by winding shear reinforcing bars (3) around four main bars (2) to interconnect them. It was assumed that the building would be constructed by pouring concrete (4).

The main reinforcing bars (2)... and the shear reinforcing bars (3) are made of fibers with high tensile strength (8 bundled threads of 53t) as shown in the third figure.
6) is knitted into a round string shape, and each fiber (5) is integrated into a reinforcing material (consisting of force), the surface of which is coated with a curable binder having hydrophilic properties (8). did.

Thus, the main reinforcement (2)... and the shear reinforcement (3)
The reinforcing material (7) constituting the main reinforcement (2) is tightly adhered to the concrete (4) by hardening of the curable binder (8).
)... and the shear reinforcing bars (3) reliably increase the strength against the tensile force generated in the concrete structure (1).

Conc of the reinforcing material (7)! J-) (4) In accordance with the second invention of the present application, the curable binder (8) applied to the surface of the reinforcing material (force) is applied to the reinforcing material (to the extent that the force causes plastic deformation). It is placed at a desired position in a semi-hardened state, and according to this, the reinforcing material (force) can obtain appropriate shape retention and bending properties, and the reinforcing material used for binding (2)...
The force is maintained in a constant shape, and on the other hand, the reinforcing material (7) used as the shear reinforcing bar (3) can be easily wound around the main bar (2) due to its plastic deformation, improving its workability. .

Fibers (5) with high tensile strength constituting the reinforcing material (7)
), for example, inorganic fibers such as carbon fibers, glass fibers, and ceramic fibers, various aromatic amide fibers including aromatic polyamides, high strength polyolefin fibers, strong polyamide fibers, polyvinyl alcohol fibers, organic fibers such as polyethylene terephthalate fibers, and cold fibers. Metal fibers such as thinned steel wire and prestressing wire can be used alone or in combination. Furthermore, if the fibers (5) are configured to have irregular cross-sections in the longitudinal direction, the frictional resistance between the fibers (5) will increase, and the stress applied to the fibers (5J) will be transferred to the reinforcing material ( The force is transmitted throughout the reinforcement (
This is preferable because it improves the adhesion between 7) and concrete (4).

The fibers (5) can be knitted into various braid shapes such as the round braid shape, square braid shape, and hand braid shape.

Moreover, it is also possible to improve the adhesion between the reinforcing material (7) and the concrete (4) by using these wires as irregular cross-sectional lines. Furthermore, when the reinforcing material (force t-IN is used as the main reinforcing material (2) as shown in FIG. It is also possible to give shape retention to.

Reinforcement material organized in a braided manner (as shown in the figure, the force is applied to the main reinforcement (2)...and the shear reinforcement reinforcement (3) in the concrete (4).
It can be used as a string, or it can be used in the form of a net or woven fabric.

The one shown is a reinforcement material (force is used as main reinforcement (2) and shear reinforcement (3) of concrete (4))
(4) is made of fiber-reinforced concrete that does not apply prestress, but using the reinforcing material (7), concrete (
4) can also be prestressed to form prestressed concrete.

Examples of the curable binder (8) include inorganic binders such as alkali metal silicates, colloidal silicates, cements, epoxy resins, phenol resins, phenol alkyral resins, and polyisocyanate resins. Organic binders can be used alone or in combination. Further, a curing agent may be added to this to accelerate curing of the binder (8), and in this case, it is preferable to use a hydrophilic curing agent.

In this way, when using the fiber-reinforced concrete of the present invention, a hardening binder having hydrophilic properties is applied to the surface of the reinforcing material made of braided fibers with high tensile strength, and this is placed in the concrete. As a result, the fibers are integrated with each other, and the stress applied to each fiber is transmitted to the entire reinforcement, and the reinforcement and concrete are tightly bonded by the hardening binder, which increases the tensile strength of the concrete. It has an extremely good reinforcing effect.

Further, according to the construction method of the present invention, after applying a curable binder to a reinforcing material made of knitted fibers with high tensile strength, the binder is semi-hardened to an extent that allows plastic deformation of the reinforcing material. Since the reinforcing material is placed in a desired position and concrete is poured, the reinforcing material can be placed easily and has excellent workability.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of applying the fiber reinforced concrete of the present invention to the construction of a columnar concrete structure;
The figure is a front diagram, and FIG. 3 is an enlarged explanatory diagram of the main parts. 4...Concrete 5...Fiber 7...Reinforcement material 8...Curing binder 2 other procedural amendments Showa Ha, '4111 Japan Patent Office Commissioner■, Small case indication 1988 Patent Application No. 224411 2, Name of the invention Fiber-reinforced concrete and its construction method 3, Relationship to the case of the person making the amendment Patent applicant Mitsui Construction Co., Ltd. Kusunoki 7 of Detailed Description of the Invention, Contents of Amendment (1) The following is added in full between page 4, line 19 of the specification and stripe line 20. (7
) 1 Main reinforcing material (2)...Reinforcement material used for binding (7)
Although not shown in the figure, the shear reinforcing bar (
This is done by utilizing the plastic deformation of the reinforcing material (7) used as 3). Cough main reinforcement (2)...If it is connected by connecting it to the husband of the reinforcing material (7) used for binding, these sleeve reinforcing members f71 (71) can be easily attached to each other without requiring a special attachment member. This further improves the workability of fiber-reinforced concrete.

Claims (1)

[Scope of Claims] 1. A reinforcing material made of fibers with high tensile strength knitted in a braided manner has a hydrophilic curable binder applied to the surface thereof, and the reinforcing material is placed in concrete. fiber-reinforced concrete. λ A hydrophilic curable binder is applied to the surface of a reinforcing material made of braided fibers with high tensile strength.
In the construction method of fiber-reinforced concrete, in which the reinforcing material is placed in concrete, after the reinforcing material is applied with the binding agent, the binding agent is semi-hardened to an extent that allows plastic deformation of the reinforcing material. A method of constructing fiber-reinforced concrete, which is characterized by placing it at a desired location and pouring it on a concrete track.