JP2006083355A - Fiber-reinforced resin structure and railroad tie - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber-reinforced resin structure which can be used for a railroad tie or the like reducing the manufacturing costs as well as securing the necessary strength. <P>SOLUTION: A railroad tie 1, which is a fiber-reinforced resin structure of the invention, has a resin shaped body A and resin shaped body B, which has a higher strength than that of the resin shaped body A, in a form bonding to each other. The resin shaped body A is formed by solidifying a resin so that long fibers 20 are unevenly distributed therein. Distribution of the long fibers 20 is more densely made in a bonding face side 10 which is bonded to the resin shaped body B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fiber-reinforced resin structure that can be used for sleepers for railways.

Sleepers are used for railway tracks, etc. This sleeper is installed at the bottom of the rail and connected to the rail, and supports the rail while maintaining the distance between the rails. is there.
Conventionally, wooden and concrete sleepers have been used, but wooden sleepers have a short service life due to decay and insect damage, and concrete sleepers are heavy and difficult to lay, There is a problem that buffer properties and workability are also inferior.

Therefore, Patent Document 1 discloses a synthetic sleeper excellent in durability, lightness, and workability. This synthetic sleeper is made of a thermosetting resin foam reinforced with long fibers embedded in the longitudinal direction.
Japanese Utility Model Publication No. 61-23042

  The sleepers are subjected to compressive stress, tensile stress, bending stress, etc. when the track is installed or when the train passes. Therefore, in order to prevent deformation and damage, it is desirable to add a large amount of fiber as a reinforcing material. However, there is a limit to the amount of addition in terms of molding technology, and the manufacturing cost increases as the amount of addition increases.

  In general, when the resin to which the fiber is added is subjected to bending stress, even if the same amount of fiber is added, the more the amount of fiber is at the position outside the bend and the greater the reinforcement effect on the outside is, the less the bending is It becomes high strength.

When fiber reinforced resin is used for sleepers of direct connection track (slab track) or bedded track (ballast track), it is longer in the longitudinal direction (direction perpendicular to the rail direction) than non-track track such as bridges. The total amount of long fibers oriented in the longitudinal direction may be relatively small because they are less susceptible to large tensile stress.
Therefore, reducing the amount of long fibers near the center in the cross section of the sleeper and relatively increasing the amount of long fibers on the outside (near the surface) can provide appropriate strength while reducing the manufacturing cost. So ideal.

For this reason, it is conceivable that a surface portion and a central portion having a smaller amount of fiber than the surface portion are separately manufactured, and these are joined to give an appropriate strength while reducing manufacturing costs. . However, if they are combined after being manufactured separately, the strength changes easily at the joints, and this tends to cause distortion during deformation.
In addition, it is possible to gradually change the strength by laminating a number of members of materials with different strengths and reducing the difference in strength between adjacent materials, but for resin molded products of materials with different strengths, Many types of molded products are required, and extra work for molding and joining is required, and extra time is required for manufacturing.

  Moreover, the surface of the sleeper may be required to have different performance from the central portion, such as wear resistance, and it is desirable to cope with this.

  Then, this invention makes it a subject to provide the fiber reinforced resin structure which can ensure required intensity | strength, making manufacturing cost low, and can be used for a sleeper.

In order to achieve the above-mentioned object, the invention according to claim 1 is a resin molded by solidifying a resin in a state in which long fibers are oriented in a predetermined direction and arranged so that the long fibers are unevenly distributed. A fiber reinforced resin structure having a molded body A and a resin molded body B which is bonded to the bonding surface of the resin molded body A and has a strength higher than the strength in the vicinity of the bonded surface of the resin molded body A. The uneven distribution state of the long fibers of the body A is a fiber-reinforced resin structure characterized in that the disposition density of the long fibers decreases as the distance from the bonding surface increases.
Here, the arrangement density indicates the weight of long fibers per unit volume of the resin after molding, and can indicate whether there are many long fibers in the resin molded body. When the same long fibers are used, the arrangement density is small when the amount of long fibers arranged is small (when the amount of long fibers per volume is small). Further, even if the number of long fibers per unit volume of the resin after molding is the same, the arrangement density increases when the fibers are thick and heavy.

According to the first aspect of the present invention, the resin molded body B is formed by joining the resin molded body B having a strength higher than that of the resin molded body A to the resin molded body A. Since it is unevenly distributed so that the disposition density of the long fibers decreases as the distance from the bonding surface where the resin is bonded, the strength can be gradually increased toward the resin molded body B side. Furthermore, the fiber reinforced resin structure is mainly subjected to bending stress so that the orientation direction of the long fibers in the structure is less likely to be directly subjected to the tension / compression force in the orientation direction of the long fibers of the structure, such as sleepers. When it is used for applications in which the vicinity of the surface receives tensile / compressive force, fiber reinforcement can be appropriately performed according to the required strength.
In the invention described in claim 1, since the resin molded body A and the resin molded body B are manufactured by joining, the resin molded body A can be manufactured at low cost by imparting wear resistance only to the resin molded body B. Any material can be used.

  The invention according to claim 2 is a resin molded body A formed by solidifying a resin in a state where the long fibers are unevenly arranged while the long fibers are oriented in a predetermined direction, and a resin molded body. A fiber reinforced resin structure having a resin molded body B which is bonded to the bonding surface of A and has a strength higher than the strength in the vicinity of the bonded surface of the resin molded body A, And a plane that is substantially parallel to the bonding surface and is parallel to the bonding surface and the opposite surface, the distance between the bonding surface and the distance between the bonding surface and the virtual surface S1 being the same. In this case, the fiber-reinforced resin structure is characterized in that the arrangement density of the long fibers between the bonding surface and the virtual plane S1 is larger than the arrangement density of the entire resin molded body A.

According to the second aspect of the present invention, the resin molded body B having a strength higher than that of the resin molded body A is joined to the resin molded body A, and has an opposing surface parallel to the joint surface. And when the plane of the position where the distance between the joint surface and the opposing surface is equal is the virtual surface S1, the arrangement density of the long fibers between the joint surface and the virtual surface S1 is the entire resin molded body A. Since it is larger than the arrangement density, the strength of the joint surface and the virtual surface S1 can be increased, and the resin molded body B side can be increased in strength.
Furthermore, in the same manner as in the first aspect of the invention, when this fiber reinforced resin structure is used for sleepers or the like, fiber reinforcement can be appropriately performed according to the required strength, and the resin molded body B By imparting wear resistance only to the resin molded body A, an inexpensive material can be used.

The invention according to claim 3 is a resin molded body A formed by solidifying a resin in a state where the long fibers are unevenly arranged while the long fibers are oriented in a predetermined direction, and a resin molded body. A fiber reinforced resin structure having a resin molded body B bonded to the bonding surface of A and having a strength higher than the strength in the vicinity of the bonded surface of the resin molded body A. The resin molded body A has a substantially flat surface. There is a certain joining surface and a facing surface that faces the joining surface and is substantially parallel to the joining surface, is parallel to the joining surface and the facing surface, and is a distance obtained by doubling the distance from the joining surface. When a plane having the same distance from the surface is defined as the virtual surface S2, the arrangement density of long fibers between the bonding surface and the virtual surface S2 is 1.2 of the arrangement density of the entire long fibers of the resin molding A. It is a fiber reinforced resin structure characterized by being twice or more.

According to the third aspect of the present invention, the resin molded body B having a strength higher than that of the resin molded body A is joined to the resin molded body A, and has an opposing surface parallel to the joint surface. When the plane at the position where the distance from the joint surface is twice the distance from the opposing surface is the virtual surface S2, the arrangement density of long fibers between the joint surface and the virtual surface S2 is And since it is 1.2 times or more of the arrangement density of the whole long fiber of the resin molding A, a joining surface can be made into especially high intensity | strength.
Furthermore, in the same manner as in the first aspect of the invention, when this fiber reinforced resin structure is used for sleepers or the like, fiber reinforcement can be appropriately performed according to the required strength, and the resin molded body B By imparting wear resistance only to the resin molded body A, an inexpensive material can be used.

  In the invention according to claim 4, the resin molded body B is formed by orienting long fibers in a predetermined direction, and the resin molded body A and the resin molded body B are parallel to each other in the orientation direction of the long fibers. The fibers according to claim 3, wherein the fibers are bonded so that the arrangement density of the long fibers of the resin molded body B is larger than the arrangement density of the long fibers between the bonding surface and the virtual surface S <b> 2. It is a reinforced resin structure.

  According to the invention described in claim 4, by making the arrangement density of the long fibers between the joining surface and the virtual plane S <b> 2 smaller than the arrangement density of the long fibers of the resin molding B, the resin molding B The strength can be higher than the strength in the vicinity of the joint surface of the resin molding A.

  The invention according to claim 5 is the fiber reinforced resin according to any one of claims 2 to 4, wherein the opposing surfaces of the resin molded body A are joined together to integrate two fiber reinforced resin structures. It is a resin structure.

  According to the fifth aspect of the present invention, the opposing surfaces of the resin molded body A are joined to each other so that the two fiber reinforced resin structures are integrally formed. The two resin molded bodies B are laminated so that the surface layer portion is a surface layer portion, with a relatively high strength portion on the surface side and a relatively low strength portion on the inner side. Therefore, the strength can be increased when the resin molded body B on the surface portion is bent with the inside facing the other and the other facing the outside. And it is excellent in durability, when a fiber reinforced resin structure is used for the use bent repeatedly like a sleeper.

  The resin molding A can also be a foamed resin (claim 6). Moreover, the resin used for the resin molding A can also be a polyurethane resin. Furthermore, the long fiber used for the resin molding A can also be made into glass fiber (Claim 8).

  The invention according to claim 9 is characterized in that the resin molded body A is formed continuously by bundling long glass fibers and solidifying after impregnating the resin liquid. The fiber-reinforced resin structure according to claim 8.

  According to the ninth aspect of the present invention, the resin molded body A is formed continuously by bundling long glass fibers and solidifying after impregnating the resin liquid. High productivity.

  In the invention according to claim 10, the resin molded body B is formed by continuously molding a long glass fiber into a bundle shape, impregnating the resin liquid and then solidifying it. The fiber-reinforced resin structure according to claim 9, wherein the resin molded body B is solidified when the body A is solidified, and the resin molded body A and the resin molded body B are integrated. is there.

  According to the invention of claim 10, since the resin molded body A and the resin molded body B are continuously molded and the resin molded body A and the resin molded body B are integrated, the productivity is higher. .

  A sleeper can be made using the fiber-reinforced resin structure according to any one of claims 1 to 10 (claim 11).

  According to the fiber reinforced resin structure of the present invention, the necessary strength can be ensured while reducing the manufacturing cost.

Hereinafter, specific examples of the present invention will be described.
A sleeper tree 1 which is a fiber reinforced resin structure using a resin molded body is shown in FIG. 1 and has an overall shape of a prism. And the resin molding A and the resin molding B are provided, these have overlapped in the up-down direction, and have a layered structure.

The resin molded body A of the sleeper 1 has a prismatic shape and is thicker in the vertical direction than the resin molded body B. And as FIG. 2 shows, the joining surface 10 is provided in the upper side of the resin molding A, and the opposing surface 11 is provided in the lower side, and the joining surface 10 and the opposing surface 11 are parallel. . The joint surface 10 is joined to the resin molded body B.
Further, the shape of the resin molded body A and the shape of the resin molded body B are the same except for the thickness in the vertical direction.

  The resin molded body A is formed by solidifying a resin in a state where the long fibers 20 are arranged so as to be unevenly distributed. The resin molded body A is molded as a whole, and is not such that a plurality of molded bodies are separately molded and integrated by bonding or the like.

  The resin molding A is a polyurethane resin reinforced with long fibers 20, and this polyurethane resin is formed by reacting a polyol and an isocyanate.

  Polyol glycol used for the polyurethane resin may be polypropylene glycol (PPG), polytetramethylene glycol (PTMG), or the like. Other polyols can be used.

  As the isocyanate used for the polyurethane resin, methylene diphenyl isocyanate (hereinafter referred to as MDI), polymedic MDI, or the like can be used. In addition, isocyanate other than this can be used.

The long fibers 20 of the resin molded body A are oriented in one direction, and this direction is oriented in the longitudinal direction of the sleeper 1. The long fibers 20 used in this embodiment are glass fibers.
The long fibers 20 used in the resin molded body A may be other than glass fibers and are not particularly limited, but those having high tensile strength are desirable, such as inorganic fibers such as carbon fibers, metal fibers and ceramic fibers, and aromatic polyamide fibers. Organic fibers such as synthetic fibers and natural fibers can be used.

In addition, the long fibers 20 have different arrangement densities depending on positions and are unevenly distributed. Specifically, the closer to the bonding surface 10 side, the larger the amount of long fibers 20 per unit volume, and the higher the arrangement density of the long fibers 20. Further, the closer to the facing surface 11, the smaller the amount of long fibers 20 per unit volume, and the lower the arrangement density of the long fibers 20.
In addition, arrangement | positioning density shows the weight of the long fiber 20 per unit volume of resin after shaping | molding, and when the same long fiber 20 is used, when the quantity arrange | positioned the long fiber 20 is small (per volume) When the amount of the long fibers 20 is small), the arrangement density is small.

The state of arrangement of the long fibers 20 of the resin molded body A will be described using virtual surfaces S1 and S2 shown in FIG.
FIG. 2 illustrates a cross section of the sleeper 1. FIG. 2 schematically illustrates the arrangement of the long fibers 20, and differs from the actual thickness and number of fibers.
The virtual surfaces S <b> 1 and S <b> 2 are surfaces parallel to the bonding surface 10 and the facing surface 11. Further, the virtual surface S1 is a plane in which the distance from the bonding surface 10 and the distance from the facing surface 11 are equal, and the virtual surface S2 is a distance obtained by doubling the distance from the bonding surface and the distance from the facing surface. Are equal planes.

  And the amount per unit volume of the long fibers 20 decreases as the distance from the bonding surface 10 to the facing surface 11 decreases, and the arrangement density decreases. Therefore, the strength increases toward the bonding surface 10 side, and the strength decreases toward the facing surface 11 side.

And the quantity of the long fiber 20 of the part L1 enclosed by the joining surface 10 and the virtual surface S1 is larger than the other part (part between the virtual surface S1 and the opposing surface 11). The arrangement density of the long fibers 20 in the portion L1 between the bonding surface 10 and the virtual surface S1 is larger than the other portions, and is larger than the entire resin molding A.
Therefore, the strength in the longitudinal direction of the sleeper 1 of the portion L1 surrounded by the virtual surface S1 is higher than that of the other portions.

Further, the amount of the long fibers 20 in the portion L2 surrounded by the joining surface 10 and the virtual surface S2 is 120% or more, particularly preferably 150% or more, with respect to the total amount of long fibers of the resin molded body A. is there. And the arrangement | positioning density of the part L2 is 1.2 times or more of the arrangement density of the whole long fiber 20 of the resin molding A, Most preferably, it is 1.5 times or more.
Thus, the long fibers 20 of the resin molded body A are particularly biased toward the joint surface 10, and the longitudinal strength of the sleeper 1 near the joint surface 10 is high in the resin molded body A.

  The resin molded body A is formed continuously by making long long fibers 20 into a bundle shape, impregnating a resin liquid, and then solidifying.

  The resin molded body B is a resin reinforced by the long fibers 20 that are glass fibers in the same manner as the resin molded body A. The long fibers 20 are oriented in one direction, and this direction is the longitudinal direction of the columnar body of the sleeper 1 like the resin molded body A. Similarly to the resin molded body A, the resin molded body B is continuously formed by making long glass fibers into a bundle and impregnating the resin liquid and then solidifying.

  In addition, the molding method of the resin molded body A and the resin molded body B will be described later.

  Similarly to the resin molded body A, the resin molded body B uses a polyurethane resin. The polyurethane resin used for the resin molded body B may be the same as that of the resin molded body A, or another type of polyurethane resin may be used. In addition, as resin used for the resin molding B, resin other than a polyurethane resin can be used.

2, the arrangement density of the long fibers 20 of the resin molded body B is higher than the arrangement density of the long fibers 20 of the portion L2 of the resin molded body A, and the length per volume of the resin molded body B is longer. The amount of the fibers 20 is larger than the amount of the long fibers 20 per volume of the portion L2 near the joint surface 10 of the resin molded body A.
Therefore, the resin molded body B has higher strength than the portion L2 near the joint surface 10 of the resin molded body A.

In addition, the long fiber 20 is used for the resin molding B, and the long fiber 20 is oriented in the longitudinal direction of the sleeper 1 like the resin molding A. Moreover, as a fiber used for the resin molding B, other forms of fibers, for example, short fibers, mat-like fibers, cloth-like fibers, and the like can be used. Furthermore, if the strength of the resin material itself is high and higher than that of the portion L2 in the vicinity of the joint surface 10 of the resin molded body A, the fibers need not be reinforced.
For example, when mat-like or cloth-like fibers are used, the orientation direction of the fibers is directed to a plurality of directions, so that the strength when subjected to a tensile load in a direction other than the longitudinal direction of the sleeper 1 is high. Become.

  Moreover, the fiber used for a suitable diameter can be used and the fiber of the diameter different from the resin molding A can be used.

  Thus, the sleeper 1 is obtained by bonding the resin molded body B to the bonding surface 10 of the resin molded body A, and gradually increases in strength from the facing surface 11 of the resin molded body A toward the resin molded body B. It can be. Therefore, when using it for the use which a bending stress generate | occur | produces with respect to the sleeper 1, it can reinforce fiber more efficiently by setting it as the resin molding B side which becomes high strength outside a bending.

  About both or any one of the resin molding A and the resin molding B, you may make it foam with the foaming agent as needed. In this case, the expansion ratio can be adjusted by the amount of the foaming agent added and the molding conditions. And a density and intensity | strength can be changed by adjusting a foaming rate.

The sleeper 1 may be manufactured by molding the resin molded body A and the resin molded body B separately, and then bonding the joint surface 10 of the resin molded body A and the resin molded body B.
In addition, the resin molded body A and the resin molded body B may be molded continuously, or may be molded by a method in which a predetermined mold is filled with resin and solidified.
In the case where the resin molded body A and the resin molded body B are continuously molded, the resin molded body A and the resin molded body B can be joined while being molded in the same line as shown below.

As a method of manufacturing the sleeper 1 while molding the resin molded body A and the resin molded body B on the same line, it can be manufactured using a manufacturing apparatus 50 as shown in FIG.
The manufacturing apparatus 50 includes a first molded portion 48 that molds the resin molded body A, a second molded portion 49 that molds the resin molded body B, and the resin molded body A and the resin molded body B in the molding passage. A curing portion 47 that cures while being bonded is provided.

  In the first molding part 48, the resin liquid 52 a ejected from the resin ejection part 55 is ejected to the long fibers 20. Thereafter, the resin liquid 52 a is uniformly impregnated into the long fibers 20, which are glass fibers, with the squeezing plate 56, and sent to the curing unit 47 together with the back surface material 58.

  In the second molding unit 49, the resin liquid 53 a is ejected from the resin ejection unit 59 onto the polyethylene film 70, the glass paper 71, the long glass fibers 72, and the glass scrim 73 are laminated and sent to the curing unit 47.

  In addition, the resin liquid 52a and the resin liquid 53a are mixed liquids containing polyol and isocyanate, and when the resin molded body A and the resin molded body B are molded, a polyurethane resin is obtained. The resin liquid 52a and the resin liquid 53a are adjusted by adding a predetermined amount of a polyol and an isocyanate and, if necessary, a foaming agent or a catalyst, and mixing them with a mixer or the like to adjust the resin liquid.

Then, the resin liquid 52a impregnated in the long fibers 20 sent from the first molding part 48 to the curing part 47 is cured and solidified, and the resin molded body A is molded. At this time, more continuous fibers 20 are arranged on the upper side (resin molded product B side). Specifically, the tension of the long fibers 20 is increased toward the upper side, and the upper side is biased so that the longer fibers 20 are increased toward the upper side.
When the resin molded body A is molded, the long fibers 20 are unevenly distributed, and the arrangement density of the long fibers 20 on the resin molded body B side is increased.

  On the other hand, from the 2nd shaping | molding part 49, it sends to the hardening part 47 in the state in which the glass paper 71, the glass long fiber 72, and the glass scrim 73 were laminated | stacked. Then, the resin liquid 53a is cured and solidified, and the resin molded body B is molded.

In the curing portion 47, the resin molded body A and the resin molded body B are cured almost at the same time while passing between the endless belts 57 a and 57 b forming the molding passage 57.
That is, when the resin liquid 52a and the resin liquid 53a are cured, the resin molded body A and the resin molded body B are molded at the curing unit 47 almost simultaneously. Therefore, when molded, the resin molded body A and the resin molded body B are joined, and a joining step is unnecessary as compared with the method of molding the resin molded body A and the resin molded body B separately.

  A technique for continuously manufacturing the resin molded body A and the resin molded body B using a manufacturing apparatus 50 as shown in FIG. 3 is disclosed in JP-A-8-155983. .

  FIG. 4 shows a sleeper 2 according to the second embodiment of the present invention. This sleeper tree 2 is manufactured by using the two sleeper trees 1 having the same shape as the fiber reinforced resin structure, and specifically, is manufactured by joining the opposing surfaces 11 together. ing. In the sleeper 2, the facing surface 11 is located near the center of the sleeper 2 and is a symmetrical surface.

  The overall shape of the sleeper tree 2 is prismatic, and the layer structure of the sleeper tree 2 is a four-layer structure. This layer configuration is, in order, a resin molded body B, a resin molded body A, a resin molded body A, and a resin molded body B.

Therefore, the sleeper 2 is provided with the resin molding B on the outer layers on both sides. Moreover, since the arrangement | positioning density of the long fiber 20 by the side of the joining surface 10 becomes high, the two resin molded bodies A joined by the opposing surface 11 become high in intensity | strength as the outer side.
Therefore, in the sleeper 2, the strength increases from the facing surface 11 toward the outside, and the high-strength resin molded body B is positioned on the outside. Therefore, when the sleeper 2 is bent so that the stacking direction (vertical direction in FIG. 4) is inward and outward, the strength increases in any direction, and durability is high even when the sleeper 2 is repeatedly bent such as by vibration.

It is a perspective view of the sleeper tree of the 1st embodiment of the present invention. It is an exploded sectional view in the CC section of the sleeper tree of FIG. It is a perspective view which shows the sleeper manufacturing apparatus of FIG. It is a perspective view of the sleeper tree of the 2nd Embodiment of this invention.

Explanation of symbols

1, 2 Sleeper 10 Joint surface 11 Opposing surface 20 Long fibers S1, S2 Virtual surfaces A, B Resin molded body

Claims (11)

A resin molded body A formed by solidifying a resin in a state where the long fibers are arranged so as to be unevenly distributed while orienting the long fibers in a predetermined direction, and bonded to the bonding surface of the resin molded body A. A fiber reinforced resin structure having a resin molded body B having a strength higher than the strength in the vicinity of the joint surface of the molded body A,
The fiber reinforced resin structure characterized in that the uneven distribution state of the long fibers of the resin molded body A is such that the disposition density of the long fibers decreases as the distance from the bonding surface increases. A resin molded body A formed by solidifying a resin in a state where the long fibers are arranged so as to be unevenly distributed while orienting the long fibers in a predetermined direction, and bonded to the bonding surface of the resin molded body A. A fiber reinforced resin structure having a resin molded body B having a strength higher than the strength in the vicinity of the joint surface of the molded body A,
The resin molded body A has a facing surface that faces the joining surface and is substantially parallel to the joining surface, is parallel to the joining surface and the facing surface, and is a distance between the joining surface and the facing surface. A fiber reinforcement characterized in that, when a virtual plane S1 is a plane having the same distance, the arrangement density of long fibers between the bonding surface and the virtual plane S1 is larger than the entire arrangement density of the resin molded body A. Resin structure. A resin molded body A formed by solidifying a resin in a state where the long fibers are arranged so as to be unevenly distributed while orienting the long fibers in a predetermined direction, and bonded to the bonding surface of the resin molded body A. A fiber reinforced resin structure having a resin molded body B having a strength higher than the strength in the vicinity of the joint surface of the molded body A,
The resin molded body A has a substantially flat joining surface and a facing surface facing the joining surface and substantially parallel to the joining surface, parallel to the joining surface and the facing surface, When the virtual surface S2 is a plane in which the distance between the distance and the opposite surface is equal, the arrangement density of the long fibers between the joint surface and the virtual surface S2 is the entire resin molded body A. A fiber-reinforced resin structure characterized by being 1.2 times or more the arrangement density of long fibers.   The resin molded body B is formed by orienting long fibers in a predetermined direction, and the resin molded body A and the resin molded body B are bonded so that the orientation directions of the long fibers are parallel to each other. The fiber reinforced resin structure according to claim 3, wherein the arrangement density of the long fibers of the molded body B is larger than the arrangement density of the long fibers between the bonding surface and the virtual surface S2.   The fiber-reinforced resin structure according to any one of claims 2 to 4, wherein the opposing surfaces of the resin molded body A are joined together to integrate two fiber-reinforced resin structures.   The fiber-reinforced resin structure according to any one of claims 1 to 5, wherein the resin molding A is a foamed resin.   The fiber reinforced resin structure according to any one of claims 1 to 6, wherein the resin used for the resin molding A is a polyurethane resin.   The fiber reinforced resin structure according to any one of claims 1 to 7, wherein the long fibers used in the resin molded body A are glass fibers.   9. The fiber according to claim 8, wherein the resin molded body A is formed by continuously forming a long glass fiber into a bundle shape, impregnating the resin liquid and then solidifying the resin liquid. Reinforced resin structure. The resin molded body B is formed by continuously molding a long glass fiber into a bundle, solidifying after impregnating the resin liquid,
The fiber-reinforced resin structure according to claim 9, wherein the resin molded body B is solidified when the resin molded body A is solidified, and the resin molded body A and the resin molded body B are integrated. object.   A sleeper using the fiber-reinforced resin structure according to any one of claims 1 to 10.

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