JP2005199700A - Fiber-reinforced synthetic resin made lattice like body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber-reinforced synthetic resin made lattice like body which has a low manufacturing cost and large bending moment in the case of being used together with reinforcement in a NOMST process. <P>SOLUTION: A lattice state is formed by some vertical components arranged in parallel by being estranged and some horizontal components arranged in parallel by being estranged so as to cross the vertical component. Both of the vertical component and the horizontal component comprise a fiber bundle made by bundling total number of fibers arranged in parallel by being estranged. In a crossing part of the vertical component and the horizontal component, and the fiber bundle of the vertical component and the fiber bundle of the horizontal component are alternately laminated to form the fiber-reinforced synthetic resin made lattice like body. In the crossing part, a total number of filaments in the fiber bundle of the vertical component and the horizontal component are respectively 396,000-4,800,000 and the number of layers of the vertical component and the horizontal component are respectively 3-10 to provide the fiber-reinforced synthetic resin made lattice like body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fiber-reinforced synthetic resin grid-like body suitably used for concrete repair / reinforcement for bridges, tunnels, bay structures, etc., and for starting and reaching a machine in a shield shaft.

Conventionally, a lattice-shaped body made of fiber reinforced synthetic resin has been used as a reinforcing member or the like embedded in concrete. For example, in shield construction, when a shield machine is started and reached using a shaft, it is embedded in concrete as a side wall of the shaft. Among various methods of shield construction, in the NOMST (Novel Material Shieldable Tunnel-Wall System) method, this fiber-reinforced synthetic resin grid is often used in combination with reinforcing bars.
As such a fiber-reinforced synthetic resin lattice, for example, Patent Document 1 discloses a reinforcing member embedded in a portion that becomes a concrete structure, in which fiber bundles made of a plurality of aligned fibers are mutually attached. Crossed to form a lattice, each fiber of the fiber bundle is bound by a resin material, and the intersection of the fiber bundle is a fiber group extending in one direction and a fiber group extending in the other direction Describes a concrete reinforcing member characterized by having a cross-sectional shape laminated in three or more layers. Specifically, there is described a reinforcing member in which eight layers of fiber bundles in which four fibers are aligned at the intersecting portion of the lattice-like body are laminated in each of the vertical direction and the horizontal direction.

JP-A-62-153449

However, the conventional fiber-reinforced synthetic resin grid has a problem of high manufacturing costs.
In addition, when a conventional fiber reinforced synthetic resin grid is used in combination with a reinforcing bar in the NOMST method, the bending moment decreases according to the thickness of the fiber reinforced synthetic resin grid, so the total number of fibers is increased. There was also a problem that the corresponding bending strength could not be obtained.
Accordingly, an object of the present invention is to provide a fiber reinforced synthetic resin grid having a low bending cost and a large bending moment when used in combination with reinforcing bars in the NOMST method.

  As a result of earnest research on the fiber-reinforced synthetic resin grids to achieve the above object, the present inventor has determined that the total number of fibers used in each member according to a predetermined strength required for each member constituting the grid itself. If the number of fiber bundles at the intersection is increased and the number of fibers per layer is reduced, the manufacturing cost increases. Conversely, the number of fiber bundles at the intersection is reduced. It has been found that when the number of fibers per layer is increased, the strength of the intersection may be weakened. In addition, the present inventors have increased the manufacturing cost of the conventional fiber-reinforced synthetic resin grids because the number of fiber bundles at the intersection is large and the number of fibers per layer is small. I found out. Further, the present inventor has found that the number of fiber bundle layers at the intersection where the manufacturing cost is low and the strength of the intersection is increased is determined according to the total number of fibers of each member. It was.

Furthermore, the present inventor can reduce the thickness of the lattice-like body by reducing the number of fiber bundle layers at the intersecting portion, and as a result, efficiently contributes to bending strength when used in combination with reinforcing bars. It has been found that a lattice-like body can be arranged at a position where it can be done.
And this inventor completed this invention based on these knowledge.

That is, the present invention is formed in a lattice shape by a plurality of vertical members spaced apart and arranged in parallel, and a plurality of transverse members spaced apart and arranged in parallel so as to intersect the vertical member. ,
Each of the vertical member and the horizontal member comprises a fiber bundle formed by binding a plurality of fibers arranged in parallel with a synthetic resin,
In the intersecting portion of the vertical member and the horizontal member, the fiber bundle of the vertical member and the fiber bundle of the horizontal member are fiber-reinforced synthetic resin lattices, which are alternately laminated,
In the intersecting portion, the total number of filaments in the fiber bundle of the longitudinal member and the transverse member is 396,000 to 4,800,000, respectively, and the number of layers of the fiber bundle of the longitudinal member and the transverse member Provide a fiber-reinforced synthetic resin lattice having 3 to 10 respectively.

Further, the present invention is formed in a lattice shape by a plurality of vertical members spaced apart and arranged in parallel and a plurality of horizontal members spaced apart and arranged in parallel so as to intersect the vertical members. ,
Each of the vertical member and the horizontal member comprises a fiber bundle formed by binding a plurality of fibers arranged in parallel with a synthetic resin,
In the intersecting portion of the vertical member and the horizontal member, the fiber bundle of the vertical member and the fiber bundle of the horizontal member are fiber-reinforced synthetic resin lattices, which are alternately laminated,
In the intersecting portion, the total number of filaments in the fiber bundle of the longitudinal member and the transverse member is 5,040,000 to 9,600,000, respectively, and the fiber bundles of the longitudinal member and the transverse member are Provided is a fiber-reinforced synthetic resin grid having 4 to 19 layers.

  The fiber-reinforced synthetic resin grid-like body of the present invention is excellent in strength, particularly in the strength of the intersection, and is low in production cost.

The present invention is described in detail below. Hereinafter, the lattice-shaped body of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
The first aspect of the fiber-reinforced synthetic resin grid-like body of the present invention (hereinafter simply referred to as “the grid-like body of the present invention”) includes a plurality of vertical members spaced apart and arranged in parallel, and the vertical members Are formed in a lattice shape with a plurality of lateral members arranged in parallel so as to intersect with each other,
Each of the vertical member and the horizontal member comprises a fiber bundle formed by binding a plurality of fibers arranged in parallel with a synthetic resin,
In the intersecting portion of the vertical member and the horizontal member, the fiber bundle of the vertical member and the fiber bundle of the horizontal member are fiber-reinforced synthetic resin lattices, which are alternately laminated,
In the intersecting portion, the total number of filaments in the fiber bundle of the longitudinal member and the transverse member is 396,000 to 4,800,000, respectively, and the number of layers of the fiber bundle of the longitudinal member and the transverse member Are fiber reinforced synthetic resin lattices each having 3 to 10.

Further, the second aspect of the grid-like body of the present invention includes a plurality of vertical members spaced apart and arranged in parallel, and a plurality of horizontal members spaced apart and arranged in parallel so as to intersect the vertical member. Is formed in a lattice shape,
Each of the vertical member and the horizontal member comprises a fiber bundle formed by binding a plurality of fibers arranged in parallel with a synthetic resin,
In the intersecting portion of the vertical member and the horizontal member, the fiber bundle of the vertical member and the fiber bundle of the horizontal member are fiber-reinforced synthetic resin lattices, which are alternately laminated,
In the intersecting portion, the total number of filaments in the fiber bundle of the longitudinal member and the transverse member is 5,040,000 to 9,600,000, respectively, and the fiber bundles of the longitudinal member and the transverse member are This is a fiber-reinforced synthetic resin lattice having 4 to 19 layers.

  FIG. 1 is a schematic perspective view showing a part of the lattice-shaped body of the present invention, and FIG. 2 is an enlarged view of a circle A in FIG. Note that the total number of fibers and the number of layers of fiber bundles in the figure are simply shown to prevent the figure from becoming complicated, and the present invention is not limited to these.

A lattice-like body 10 shown in FIG. 1 includes a plurality of vertical members 12 that are spaced apart and arranged in parallel, and a plurality of transverse members 14 that are spaced apart and arranged in parallel so as to intersect the vertical member 12. It is formed in a lattice shape.
The width, thickness, interval, and number of the vertical member 12 and the horizontal member 14 are not particularly limited, and can be appropriately determined according to the purpose. The angle between the vertical member 12 and the horizontal member 14 is not particularly limited, but is preferably one that is vertical.

Each of the vertical member 12 and the horizontal member 14 includes a fiber bundle 20 formed by binding a plurality of fibers 16 arranged in parallel with a synthetic resin 18.
Examples of the fibers 16 include reinforced fibers such as glass fibers, boron fibers, silicon carbide fibers, alumina fibers, carbon fibers, aramid fibers, steel fibers, vinylon fibers, polyparaphenylene benzoxazole (PBO) fibers, and polyarylate fibers. There are continuous fibers. These may be used alone or in combination of two or more. Among them, it is preferable to use carbon fiber in terms of strength and rigidity.
The fiber 16 is composed of a plurality of filaments. The number of filaments constituting the fiber 16 is usually 3,000 to 120,000.
Examples of the synthetic resin 18 include thermosetting of unsaturated polyester resin, epoxy resin, phenol resin, vinyl ester resin, urethane acrylate resin, diallyl phthalate resin, polyester acrylate resin, melamine resin, silicon resin, and resins obtained by modifying these. Resin. These may be used alone or in combination of two or more. Especially, it is preferable to use a vinyl ester resin from the point of the durability with respect to the alkali component in concrete, and the stickiness as a structural member.

  The ratio of the fiber 16 and the synthetic resin 18 in the vertical member 12 and the horizontal member 14 is not particularly limited and can be appropriately determined according to the purpose. Generally, the volume content of the fiber 16 is 30 to 55. % Is preferred.

  As shown in FIG. 2, the fiber bundles 20 of the longitudinal members 12 and the fiber bundles 20 of the transverse members are alternately stacked at the intersection 22 between the longitudinal members 12 and the transverse members 14.

A conventionally well-known method can be used for the manufacturing method of the grid | lattice body of this invention. For example, the following method can be used.
First, a plurality of first fiber bundles 20a from the bottom of the transverse member 14 are spaced apart and arranged in parallel. Next, a plurality of first fiber bundles 20b from the bottom of the longitudinal member 12 are arranged in parallel so as to be orthogonal to the first fiber bundle 20a from the bottom of the transverse member 14. Here, at the intersecting portion, the first fiber bundle 20b from the bottom of the longitudinal member 12 is in contact with the upper surface of the first fiber bundle 20a from the bottom of the transverse member 14.

  Next, a plurality of second fiber bundles 20c from the bottom of the horizontal member 14 are spaced apart and arranged in parallel on the first fiber bundle 20a from the bottom of the horizontal member 14. Here, at the intersecting portion, the second fiber bundle 20c from the bottom of the horizontal member 14 is in contact with the upper surface of the first fiber bundle 20b from the bottom of the vertical member 12. Next, a plurality of second fiber bundles 20d from the bottom of the vertical member 12 are spaced apart and arranged in parallel on the first fiber bundle 20b from the bottom of the vertical member 12. Here, at the intersecting portion, the second fiber bundle 20d from the bottom of the longitudinal member 12 is in contact with the upper surface of the second fiber bundle 20c from the bottom of the transverse member 14.

In this way, by alternately arranging the fiber bundles of the longitudinal member and the transverse member from the bottom, the fiber bundles of the longitudinal member and the transverse member can be alternately laminated at the intersection. . The number of fibers in the fiber bundle may be different for each layer, but is preferably the same.
Thereafter, after adjusting the shape or simultaneously with adjusting the shape, the synthetic resin 18 of the fiber bundle 20 is cured by heat, ultraviolet light, water, solvent volatilization, etc., and the lattice-like body of the present invention can be obtained. .

  Specific examples of the method for producing a lattice-shaped body of the present invention include a method described in JP-A-62-153449 (Patent Document 1) and a method described in JP-A-3-38325. Etc. can be used.

In the lattice-shaped body of the present invention, the number of layers of the fiber bundles of the longitudinal member and the transverse member is in a specific range in the intersecting portion according to the total number of filaments in the fiber bundle of the longitudinal member and the transverse member.
Specifically, in the first aspect of the lattice-shaped body of the present invention, the total number of filaments in the fiber bundle 20 of the longitudinal member 12 and the transverse member 14 is 396,000 to 4,800, respectively, at the intersecting portion 22. , And the number of layers of the fiber bundle 20 of the vertical member 12 and the horizontal member 14 is 3 to 10, respectively.
In the second embodiment of the lattice-like body of the present invention, the total number of filaments in the fiber bundle 20 of the longitudinal member 12 and the transverse member 14 is 5,040,000 to 9,600, respectively, at the intersecting portion 22. 000, and the number of layers of the fiber bundle 20 of the longitudinal member 12 and the transverse member 14 is 4 to 19, respectively.

In order to obtain sufficient strength, the conventional fiber-reinforced synthetic resin grid-like body requires an increase in the number of fiber bundle layers at the intersection, which increases the manufacturing cost and the thickness. .
On the other hand, the lattice-like body of the present invention reduces the number of fiber bundle layers while maintaining sufficient strength by increasing the number of fibers per layer at the intersecting portion. Costs are reduced, resulting in reduced manufacturing costs. Specifically, the labor cost can be reduced by about 85% compared to the case of the conventional fiber reinforced synthetic resin grid. Moreover, the lattice-shaped body of the present invention is thin.

Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to these.
1. Creation of lattice-like body A lattice-like body was created with the total number of filaments shown in Table 1, the number of fibers per layer, and the number of fiber bundle layers.
Specifically, a fiber bundle formed by bundling carbon fibers (number of filaments per fiber: 12,000) arranged in parallel in “number of fibers per layer” in Table 1 with a vinyl ester resin. A plurality of layers were arranged and alternately stacked vertically and horizontally so that the number of layers in the vertical and horizontal directions was the “number of fiber bundle layers” in Table 1. Thereafter, the vinyl ester resin was cured at room temperature to obtain a lattice. Table 1 shows the total number of filaments in the vertical and horizontal directions.

2. Evaluation of grid-like body (1) Intersection strength A cross-shaped sample having one intersection point was cut out from the grid-like body obtained above.
Next, this cross-shaped sample was embedded in a concrete block. In addition, the Teflon coating was given beforehand to the vertical member so that concrete may not adhere. Thereafter, the longitudinal member was pulled out in the longitudinal direction to measure the shear bond strength (intersection strength) at the intersection of the longitudinal member and the transverse member.
The results are shown in Table 1. In Table 1, the intersection strengths are as follows: Comparative Example 1-1 for Examples 1-1 and 1-2, Comparative Example 2-1 for Examples 2-1 and 2-2, and Example 3-1. And 3-2, Comparative Example 3-1 was expressed as a relative value of “50.0”.

(2) Manufacturing cost Table 1 shows the manufacturing cost of the lattice-like body obtained above. The production cost was calculated from the sum of material costs and labor costs. Further, in Table 1, the production costs are as follows: Comparative Example 1-1 for Examples 1-1 and 1-2, Comparative Example 2-1 for Examples 2-1 and 2-2, and Example 3 For -1 and 3-2, Comparative Example 3-1 was expressed as a relative value of "100".

(3) Bending strength of concrete column Using the concrete column in which the lattice-like body obtained above was embedded, a bending fracture test was performed by symmetrical two-point loading. As a result, in all the examples and comparative examples, the lattice-like body did not break, and the fracture occurred on the concrete compression side.

  As is clear from Table 1, the lattice-like body of the present invention (each example) has not only a sufficient intersection strength but also a conventional fiber-reinforced synthetic resin lattice having the same total number of fibers. Compared with the shaped bodies (respective comparative examples), the manufacturing cost was low, and the bending strength as a concrete reinforcing material was equal or higher.

It is a typical perspective view which shows a part of lattice-like body of this invention. FIG. 2 is an enlarged view of a circle A in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Grid-like body 12 Vertical member 14 Horizontal member 16 Fiber 18 Synthetic resin 20, 20a, 20b, 20c, 20d Fiber bundle 22 Crossing part

Claims (2)

A plurality of vertical members that are spaced apart and arranged in parallel, and a plurality of transverse members that are spaced apart and arranged in parallel so as to intersect the longitudinal member, are formed in a lattice shape,
Each of the vertical member and the horizontal member comprises a fiber bundle formed by binding a plurality of fibers arranged in parallel with a synthetic resin,
In the intersecting portion of the vertical member and the horizontal member, the fiber bundle of the vertical member and the fiber bundle of the horizontal member are fiber-reinforced synthetic resin lattices, which are alternately laminated,
In the intersecting portion, the total number of filaments in the fiber bundle of the longitudinal member and the transverse member is 396,000 to 4,800,000, respectively, and the number of layers of the fiber bundle of the longitudinal member and the transverse member A fiber-reinforced synthetic resin lattice having 3 to 10 respectively. A plurality of vertical members that are spaced apart and arranged in parallel, and a plurality of transverse members that are spaced apart and arranged in parallel so as to intersect the longitudinal member, are formed in a lattice shape,
Each of the vertical member and the horizontal member comprises a fiber bundle formed by binding a plurality of fibers arranged in parallel with a synthetic resin,
In the intersecting portion of the vertical member and the horizontal member, the fiber bundle of the vertical member and the fiber bundle of the horizontal member are fiber-reinforced synthetic resin lattices, which are alternately laminated,
In the intersecting portion, the total number of filaments in the fiber bundle of the longitudinal member and the transverse member is 5,040,000 to 9,600,000, respectively, and the fiber bundles of the longitudinal member and the transverse member are A fiber-reinforced synthetic resin grid having 4 to 19 layers.

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