JPH0637147Y2 - Fiber-reinforced plastic girder material - Google Patents

Description

[Detailed description of the device] (Field of industrial application) This device is made of fiber reinforced plastic (FRP).
The present invention relates to I-shaped, H-shaped, T-shaped, etc. girder materials.

(Prior Art) As a girder material made of FRP, for example, one described in Japanese Patent Publication No. Sho 62-23139 is known. In this conventional girder material, a plurality of reinforcing fiber woven fabrics are superposed and arranged to form a desired girder material shape, and all the superposed woven fabrics are sewn together with a reinforcing fiber thread, and Is impregnated with. However, in this girder material, not only can the desired mechanical properties not be exhibited due to the fact that the woven yarn is curved in an arc between the reinforcing fiber yarns used for suturing or there is uneven impregnation of the resin. However, there is a problem that there is a large variation in characteristics among products. The reason is as follows.

That is, the above-mentioned conventional girder material is generally manufactured by using a so-called preform obtained by integrally stitching all the woven fabrics that are superposed and arranged with a reinforcing fiber thread, and impregnating the preform with a resin. While making it by pultrusion molding. However, even though such a preform is sewn with the reinforcing fiber yarns, the woven yarns can move freely between the reinforcing fiber yarns, so that the preforms are mainly located on the surface by rubbing with the drawing die. The woven yarn of the woven fabric is easily bent in an arc shape between the reinforcing fiber yarns. However, since FRP is a so-called anisotropic material whose properties largely depend on the direction of the reinforcing fibers as is well known, if the weaving yarn is bent in such a way, it will no longer exhibit the desired properties. You cannot do it. In addition, since the degree of bending slightly changes depending on the drawing conditions, the variation in characteristics between products becomes large.

Another reason is that the above-mentioned conventional girder uses a preform in which all the woven fabrics that are superposed and arranged so as to form a desired girder shape are sewn together with reinforcing fiber yarns. This is because the resin does not fully reach to 1 and the uneven resin distribution tends to become large. Such inconvenience naturally increases as the wall thickness increases.

In the end, the conventional girder material is desired to be improved, because desired mechanical characteristics cannot be obtained or there is a large variation in characteristics among products.

(Problems to be Solved by the Invention) The purpose of the present invention is to solve the above-mentioned problems of the above-mentioned girder material and to exhibit mechanical characteristics extremely close to the design value, and also to cause variations in characteristics among products. To provide less FRP girder material.

(Means for Solving Problems) In order to achieve the above-mentioned object, in the present invention,
A plurality of reinforcing fiber base materials, which are formed by stacking a plurality of reinforcing fiber fabrics and stitching them together with reinforcing fiber yarns, are arranged in combination so as to form a desired beam material shape. There is provided a girder material made of fiber reinforced plastic, characterized in that the composite fabric and the composite fabric are impregnated with a resin.

The girder material of this invention will be described in detail together with its manufacturing method. In this invention, first, a reinforcing fiber base material is prepared in which a plurality of reinforcing fiber fabrics are superposed and integrally stitched with a reinforcing fiber thread. .

The reinforced fiber woven fabric is, for example, a plain woven fabric, a satin woven fabric, or a twill woven fabric using a multifilament of high-strength, high-modulus fibers such as carbon fiber, glass fiber, and polyaramid fiber as a woven yarn. However, the woven fabric may be an ordinary so-called bidirectional woven fabric in which the warp and the weft are orthogonal to each other, and the weft is + 30 ° to + 60 ° or −30 ° to the warp.
It may be a so-called bias woven fabric extending in the direction of -60 °, and those woven fabrics are superposed so that a desired number of warp yarns or weft yarns cross each other as required, and a reinforcing fiber yarn Are sewn together to form a reinforcing fiber base material.

The reinforcing fiber thread used for suturing has the high strength as described above,
It is composed of multifilaments of high elastic modulus fibers. Thus, the stitching of the fabric with such a reinforcing fiber yarn is performed by single stitch or lock stitch. A single chain stitch is preferred. Although the reinforcing fiber yarn is sufficiently thinner than the woven yarn, it is preferable that the reinforced fiber yarn has a breaking elongation higher than that of the woven yarn and a shrinkage ratio at the molding temperature described later of 2% or less. This is because the reinforcing fiber thread used for suturing has to bend much more than the woven thread, but if the bending is large, stress concentrates on that part, and in that case, the reinforcing fiber thread is woven. The breakage of the girder material from the sutured part progresses before it breaks before the thread, and if the heat shrinkage rate is large, the heat of molding greatly shrinks and disturbs the arrangement of the woven threads. Because there is.

In the present invention, a plurality of sets of the above-mentioned reinforcing fiber base materials are used and they are combined so as to form a desired beam material shape. That is, a combination is obtained. For example, when molding an I-shaped girder material, the reinforcing fiber base material is bent into a U-shape and an inverted U-shape and arranged back to back, and if necessary, another reinforcing fiber is provided on the upper and lower surfaces thereof. The base materials are overlaid to form an I type.

Next, after overlaying the sealing fabric on the polymer thus obtained, it is impregnated or impregnated with a thermosetting resin such as epoxy resin, unsaturated polyester resin, phenol resin, vinyl ester resin, or polyimide resin. On the other hand, by a well-known pultrusion molding method, final shaping into the shape of the girder material and curing of the resin are carried out to obtain a girder material.

Since the sealing fabric remains in the resin after molding,
It is preferable that the resin acts as a reinforcing material,
It is preferably made of the high-strength, high-modulus fiber described above. Here, the sealing fabric is, for example, JP-A-61-342.
As disclosed in Japanese Patent Publication No. 44, a relatively low melting point thermoplastic such as nylon, polyester, vinylidene chloride, vinyl chloride, etc., which is continuously or discontinuously adhered linearly to at least one of warp or weft. The warp yarn and the weft yarn are adhered to each other at a crossing portion between them by a polymer so as to be sealed. Therefore, the sealing fabric does not cause misalignment even when pulled. In addition, for the sealing fabric,
There are those in which the above-mentioned thermoplastic polymer appears only on one side, those that appear on both sides, etc., but when using those that appear only on one side, the surfaces where the thermoplastic polymer appears are combined. It is preferably placed on the side of the body so that the thermoplastic polymer does not adhere to the drawing die during pultrusion. When a thermoplastic polymer having both surfaces is used, an ultrathin glass fiber woven fabric, which is generally called scrim cloth, may be further laminated on the sealing fabric. preferable.

Thus, the FRP girder material of the present invention can be obtained, but it is usually cut into a desired length after pultrusion. In addition,
The resin to be impregnated is preferably adjusted to a viscosity of about 5 to 50 poise, and the molding temperature (temperature of the drawing die) is 120 to 180.
It is preferably about ° C. The pulling speed is 0.3-2.
It is about m / min.

(Embodiment) The drawing shows an I-shaped girder material, which is a bias woven fabric 1 made of reinforcing fibers in which weft yarns extend in a + 45 ° direction with respect to warp yarns.
And the bias fabric 2 in which the weft extends in the -45 ° direction with respect to the warp so that the warp is oriented in the longitudinal direction of the girder material, and the reinforcing fiber thread 3 is sewn in a single chain to integrally sew. The reinforcing fiber base material 4 formed by bending is arranged in a U-shape. Similarly, a bias woven fabric 5 made of reinforcing fibers in which the weft extends in the -45 ° direction with respect to the warp and a bias woven fabric 6 in which the weft extends in the + 45 ° direction with respect to the warp, and the warp direction is the beam material. A reinforcing fiber base material 8 which is superposed in the longitudinal direction, sewn with a reinforcing fiber thread 7 in a single loop, and integrally sewn, is bent in an inverted U-shape, and They are arranged back to back. Furthermore, on the upper surface of the combined body of the reinforcing fiber bases 4 and 8, the weft yarn extending in the −45 ° direction with respect to the warp yarn is a bias fabric 9
And the bias fabric 10 in which the weft extends in the + 45 ° direction with respect to the warp so that the direction of the warp is the longitudinal direction of the girder material, and the reinforcing fiber thread 11 is sewn in a single loop to integrally sew The reinforcing fiber base material 12 thus obtained is combined. Similarly, on the lower surface of the combination of the reinforcing fiber bases 4 and 8, the bias fabric 13 in which the weft extends in the −45 ° direction with respect to the warp.
And the bias fabric 14 in which the weft extends in the + 45 ° direction with respect to the warp so that the direction of the warp is the longitudinal direction of the girder material, and a single chain stitch is sewn with the reinforcing fiber thread 15 to integrally sew The reinforcing fiber base material 16 thus obtained is combined. After all,
Four sets of reinforcing fiber substrates 4, 8, 12, 16 are arranged in combination so as to form an I-shaped girder shape.

At the boundary portion between the web portion and the flange portion of the girder surrounded by the reinforcing fiber bases 4, 8 and 12, the reinforcing fiber bases 4 and 8 can be bent so as to have a curvature. Since it becomes only resin and does not become FRP, in order to prevent it, the adjusting material 21 in which the reinforcing fibers are aligned in one direction is included. Similarly, the adjusting member 22 formed by aligning the reinforcing fibers in one direction is also placed in the portion surrounded by the reinforcing fiber bases 4, 8 and 16.

The sealing fabrics 17, 18, 19, and 20 are laid on the combination of the above-described reinforcing fiber base material from the reinforcing fibers. These blind fabrics 17, 18, 19, 20 are so-called bidirectional fabrics in which warp yarns and weft yarns are orthogonal to each other, and are all laminated so that the warp yarns are in the longitudinal direction of the beam material. ing.

By the way, in the above, only the arrangement of the reinforcing fibers is described, but the combination of the reinforcing fiber base material and the sealing fabric are both impregnated with resin (not shown), and FR
It is a P-shaped I-shaped girder material.

(Advantage of the Invention) Since the girder material of the present invention is constructed by stacking the sealing fabric on the combination body, so-called misalignment of the reinforcing fiber base material is prevented during the pultrusion process, and the reinforcing fiber base material is prevented. The disorder of the arrangement of the woven yarns of the reinforcing fiber woven fabric, and therefore the disorder of the array of the reinforcing fibers, is extremely small. Further, unlike the conventional girder material described above, not all the fabrics formed in the shape of the girder material are sewn and integrated, but a plurality of reinforcing fiber woven fabrics are superposed and sewn together with a reinforcing fiber yarn, and integrated. Since a plurality of sets of reinforced fiber base materials are combined and arranged so as to form a desired girder shape, the resin well penetrates into the interior during molding, and uneven distribution of the resin is small. Therefore, the girder material of the present invention can not only exhibit mechanical properties close to design values, but also greatly reduce variations among products.

[Brief description of drawings]

FIG. 1 is a partially cutaway schematic perspective view showing an embodiment of a girder material according to the present invention. 1: Bias fabric (reinforcing fiber fabric) 2: Bias fabric (reinforcing fiber fabric) 3: Reinforcing fiber yarn 4: Reinforcing fiber substrate 5: Bias fabric (reinforcing fiber fabric) 6: Bias fabric (reinforcing fiber fabric) 7: Reinforcement Fiber yarn 8: Reinforcing fiber substrate 9: Bias fabric (reinforcing fiber fabric) 10: Bias fabric (reinforcing fiber fabric) 11: Reinforcing fiber yarn 12: Reinforcing fiber substrate 13: Bias fabric (reinforcing fiber fabric) 14: Bias fabric (Reinforcing fiber fabric) 15: Reinforcing fiber yarn 16: Reinforcing fiber base material 17: Stopper fabric 18: Stopper fabric 19: Stopper fabric 20: Stopper fabric 21: Adjuster 22: Adjuster

Claims (1)

[Scope of utility model registration request] 1. A plurality of sets of reinforcing fiber base materials obtained by superposing a plurality of reinforcing fiber fabrics and integrally stitching them with a reinforcing fiber yarn, are arranged in combination so as to form a desired beam material shape, and a combination thereof. A fiber-reinforced plastic girder material characterized in that a sealing fabric made of reinforcing fibers is superposed on each other, and the combination and the sealing fabric are impregnated with a resin.