JPS6090716A - Fiber reinforced cement product - 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 a fiber-reinforced cement product having a built-in T& fiber frame in which long fibers are stretched over the frame, and to a technique for bending strength of the cement product.

Conventionally, as a fiber-reinforced cement product, the first layer was formed using a spray method to form a GRC layer containing short glass fibers.
Second, there was a method in which a reinforcing steel frame was placed on top of the reinforcing steel frame, and a second concrete layer containing no short t-shirts and fibers was formed on top of the reinforcing steel frame. The first GRC layer exhibits resistance to bending along with the reinforcing bar frame, but the fiber orientation of the GRC layer is two-dimensional random, and the fibers that work in the same direction as the main reinforcement of the reinforcing bar frame are approximately It was 15-20%. Only fibers in the same direction as the main reinforcement exhibit a reinforcing effect against bending.

The present invention has been made to solve these conventional problems.The purpose of the present invention is to use a reinforcing steel frame as a frame body, so that the built-in i-fibers work effectively against bending, and the fiber efficiency is increased. Our objective is to provide fiber-reinforced cement products that exhibit 100% of the above properties and have a synergistic effect between the reinforcing steel frame and fibers.

That is, in order to achieve this object, the fiber-reinforced cement product of the present invention is a fiber-reinforced cement product that incorporates a fiber frame in which long fiber wires are stretched, and the fiber-reinforced cement product is a fiber-reinforced cement product that incorporates a fiber frame in which long fiber wires are stretched. The structure is such that the long fiber wire is formed in a reinforcing bar frame made of reinforcement, and the long fiber wire is stretched on the reinforcing bar frame in such a manner that the direction in which the long fiber wire is stretched is in the direction of the main reinforcement.

Here, the length in the present invention is #&! Fiber fibers have a minimum length that is sufficient to stretch the required spacing, a minimum length that is sufficient to be wound once or multiple times, and a length that can be stretched at any other length. Refers to fiber. For example, glass #
1M yen refers to things like strands and rovings.

Stretching refers to the state in which the long fiber wire is stretched around the frame by winding, hooking, tying, gluing, or other methods such as stretching the long fiber wire around the frame, in any case at least two frames. This refers to the state in which long fibers are passed between the materials.

Therefore, according to the fiber-reinforced cement product of the present invention configured as described above, the cement mixture layer is reinforced by a reinforcing bar frame, especially the main reinforcing bars, and in addition, by reinforcement of the long fiber wires stretched in the direction of the main reinforcing bars, A fiber-reinforced cement product with high bending strength can be obtained.

The Young's modulus of reinforcing steel is 2, 100, O('l (I
kg/can2, which is particularly excellent, and the tensile strength is 40 kg.
/mm2, which is slightly small. On the other hand, fiber wire, such as alkali-resistant glass fiber, has a tensile strength of 200 kg/IoIo:l
Although it is about 5 times larger than reinforcing steel, the Young's modulus is 7 +) + 1
+Old) Old (Small at g/cm'. This J: Contains different reinforcing bars with different properties and fiber wires (alkali-resistant glass fibers), and is long in the direction of the main reinforcement. Because they are strung together, it is possible to obtain a fiber-reinforced cement product with bending strength that is unmatched by each component alone.

In addition, the orientation of short fibers by the spray method is two-dimensional random, and the fiber efficiency is 15-20%, whereas the fiber efficiency of the present invention is 10 (1%). This is a uniaxial parallel orientation.

Furthermore, if the reinforcing bar frame is subjected to anti-rust surface treatment, it will be effective for thin fiber-reinforced cement products because it will be used even if sufficient cover is not ensured.

Embodiments of the present invention will be described below with reference to the drawings.

In describing each embodiment, the same reference numerals are used for the same components in the drawings.

FIG. 1 is a cutaway perspective view of a fiber-reinforced cement product according to a first embodiment of the present invention, and FIG. 2 is a perspective view of a fiber frame 4 built into the fiber-reinforced cement product.

In FIGS. 1 and 2, the fiber frame 4 has a reinforcing bar frame 2 consisting of a main reinforcing bar 1a and a distribution bar 11), and alkali-resistant fibers as long fiber lines 3 are stretched in the direction of the main reinforcing bar 1a.

k! To make hMF, a reinforced cement product 6 (flat plate), it is sufficient to place a Ha frame 4 in a formwork and concrete 5.

Therefore, according to this embodiment, the external force P in the direction of the main reinforcement is
When this occurs, the reinforcing force of the main reinforcing bars 1a and the long fiber wires 3 stretched in the direction of the main reinforcing bars is reduced, resulting in a fiber-reinforced cement product that is resistant to bending.

This example can be used for panels, curtain walls,
There are gutter covers, disposable formwork, etc.

FIG. 3 is a cutaway perspective view of a fiber-reinforced cement product according to a second embodiment of the present invention.

The fiber frame 4 includes a U-shaped main reinforcement 1a and a linear distribution reinforcement 1.
1) Para-aramid fibers 4 as long fiber wires 3 are stretched in a U-shape in the direction of the main reinforcing bars 1a.

Therefore, when an external force is applied to the fiber-reinforced cement product 6 (U-shaped groove) from the side walls and the bottom, it becomes a U-shaped fiber-reinforced cement product that is resistant to bending.

In this example, para-aramid fiber was used as the long fiber line 3, and the fiber has a Young's modulus of 750° (l OO
kg/cm2, and tensile strength is 310 kg/mn+2.

FIG. 4 is a cutaway perspective view of a fiber-reinforced cement product according to a third embodiment of the present invention.

The fiber-reinforced cement product 6 (square) has two substantially square-shaped fiber frames 4a and 4b built-in, each of which is stretched with alkali-resistant glass fiber as the long fiber wire 3 in the same direction as the main reinforcement 1a. .

This is a fiber-reinforced cement product with improved bending strength due to the fiber frames 4a and 4b.

This embodiment is suitable for use as a box culvert.

FIG. 5 is a cutaway perspective view of a fiber-reinforced cement product according to a fourth embodiment of the present invention.

Fiber-reinforced cement product 6 (cylindrical) has an approximately circular shape! &
A hook frame 4 is built-in. In this embodiment, the main reinforcement 1a is in the circumferential direction, and the distribution reinforcement 11) is in the longitudinal direction.

Alkali-resistant lath fibers MF as the long Mt wires 3 are stretched in a substantially circular shape in the same direction as the main reinforcing bars 1a.

This embodiment is suitable for use in humid pipes, manholes, etc.

FIG. 6 is a cutaway perspective view of a fiber-reinforced cement product that is a first embodiment of the present invention.

A substantially circular fiber frame 4 is built into the Mh dark blue reinforced cement product 6 (cylindrical). In this embodiment, the length direction is the direction of the main reinforcement 1a, and the circumferential direction is the direction of the distribution reinforcement 11. Carbon fibers serving as the fibers 3 are stretched in the direction of the main reinforcement 1a.

This embodiment is suitable for use in piles, telephone poles, etc.

FIG. 7 is a cutaway perspective view of a fiber-reinforced cement product according to a sixth embodiment of the present invention.

Textile JAF, in the frame 4, the meta-aramid fibers as long #tk fibers 3 are stretched in the direction of the main reinforcement 1a in the reinforcing steel frame 2 formed by the main reinforcement 1a in the length direction of the product and the distribution reinforcement 1b in the 11 direction. It is set up.

This embodiment is suitable for use as sidewalk slabs, sheet piles, etc.

FIG. 8 is a cutaway perspective view of a 4&fibre-reinforced cement product, which is a seventh embodiment of the present invention.

The direction of the main reinforcement 1a is an L-shaped direction, and polypropylene fibers as the long fiber lines 3 are stretched in the same direction.

Further, the reinforcing bar frame 2 has been surface-treated by blasting with zinc. In addition to zinc, anti-rust surface treatment may be performed using methacrylic acid ester resin or the like. Therefore, it can be used even if the reinforcing bar frame 2 cannot be covered completely.

An L-shaped block is suitable for this embodiment.

FIG. 9 is a cutaway perspective view of a fiber-reinforced cement product according to an eighth embodiment of the present invention.

Alkali-resistant glass fibers m as long fiber wires 3 are stretched in the direction of the main reinforcement 1a in the length direction of the product.

For the purpose of this embodiment, a bridge girder is suitable.

Figure r) is a cutaway perspective view of a fiber-reinforced cement product according to a ninth embodiment of the present invention.

The feature of this embodiment is that although the long fiber wire 3 is stretched continuously in the direction of the main reinforcement 1a, the long fiber wire 3 is divided into the -L side and the lower side. Since it has a space 7 surrounded by the long fiber wire 3 on the side and the bottom side, it is possible to obtain a very high bending strength.

Although the embodiments of the present invention have been described below with reference to the drawings, the specific structure of the present invention is not limited to the embodiments described above.

For example, in addition to the products shown in the examples, it is also suitable for railroad ties, stair boards, slabs, etc. In addition to concrete, cement mixtures include polymer cement mortar, steel fiber-containing mortar, and the like.

The long fiber line may be stretched as a single line, or may be bundled into a plurality of lines, or may be used in the form of a tape connecting a plurality of lines with fibers in the transverse direction. Note that the reinforcing effect is improved by twisting or twisting the long fibers.

In short, any fiber frame built into a fiber-reinforced cement product in which long fiber wires are stretched in the direction of the main reinforcement of a reinforcing bar frame is included in the present invention.

[Brief explanation of the drawing]

Fig. 1 is a cutaway perspective view of a fiber-reinforced cement product that is a first embodiment of the present invention, Fig. 2 is a perspective view of a fiber frame built into the fiber-reinforced cement product, and Fig. 3 is a second embodiment of the present invention. FIG. 4 is a cutaway perspective view of a fiber-reinforced cement product as an example of the present invention; FIG. 5 is a cut-away perspective view of a fiber-reinforced cement product as a third embodiment of the present invention; FIG. FIG. 6 is a cutaway perspective view of a fiber-reinforced cement product according to a fifth embodiment of the present invention; FIG. 7 is a cutaway perspective view of a fiber-reinforced cement product according to a sixth embodiment of the present invention; FIG. 8 is a cutaway perspective view of a fiber reinforced cement product according to a seventh embodiment of the present invention, FIG. 9 is a cutaway perspective view of a fiber reinforced cement product according to an eighth embodiment of the present invention, and FIG. 10 is a cutaway perspective view of a fiber reinforced cement product according to an eighth embodiment of the present invention. FIG. 2 is a cutaway perspective view of a fiber-reinforced cement 1 product, which is a second embodiment of the present invention. 1a: Main reinforcement II]: Distribution bar 2: Reinforcing bar frame 3: Long fiber dark blue wire 4: Fiber frame 6: Fiber-reinforced cement product patent applicant Yonematsu Taiko 11- JP-A Show GO-9071G (5) JP-A Sho GO-90716 (6)

Claims (1)

[Scope of Claims] 1) A fiber-reinforced cement product having a built-in fiber frame in which long fiber wires are stretched, wherein the frame is formed into a reinforcing bar frame consisting of main bars and distribution bars. Also, a fiber-reinforced cement product characterized in that the long fiber wire is stretched around a reinforcing steel frame so that the direction in which the long fiber wire is stretched is in the direction of the main reinforcement. 2) The fiber-reinforced cement product according to claim 1, wherein the reinforcing bar frame is subjected to a rust-proofing surface treatment.