JP2017078267A - Fiber-reinforced resin rod and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced resin rod capable of increasing an adhesive force to concrete and a method for producing the same.SOLUTION: A fiber-reinforced resin rod 11 comprises a core part 12 composed of fiber bundles containing inorganic fiber, and a non-removal winding member 13 wound in the peripheral surface of the core part. The peripheral surface of the core part 12 is provided with a projecting part projected by the non-removal winding member 13 from the peripheral surface of the core part 12 toward the outside in the radial direction and a first recessed part 16 recessed from the peripheral surface of the core part 12 toward the inside in the radial direction in a region not overlapped with the non-removal winding member 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fiber-reinforced resin rod used for reinforcing concrete, for example, and a method for manufacturing the same.

  Conventionally, fiber reinforced resin rods made of FRP (Fiber Reinforced Plastics) have attracted attention as an alternative to reinforcing bars used for concrete reinforcement. For example, it is known that a fiber reinforced resin rod configured by bundling inorganic fibers such as glass fiber, basalt fiber, and carbon fiber has excellent tensile strength in the longitudinal direction. In addition to the tensile strength in the longitudinal direction, adhesion to concrete is required as an alternative to reinforcing bars used for reinforcing concrete. Therefore, Patent Document 1 describes a metal bar formed by solidifying a metal base material composed of a core material formed by bundling basalt fibers and a reinforcing bar for tightening the core material with a resin. This metal bar secures adhesion to concrete by means of spiral ridges formed by reinforcing bars spirally wound along the peripheral surface of the core material.

JP 2008-274667 A

By the way, in recent years, it is desired to further improve the adhesion of fiber reinforced resin rods to concrete.
This invention is made | formed in view of the said situation, The objective is to provide the fiber reinforced resin rod which can improve the adhesive force with respect to concrete, and its manufacturing method.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
A fiber reinforced resin rod that solves the above problems includes a core portion that is formed of a fiber bundle containing inorganic fibers, and a winding member that is wound around the peripheral surface of the core portion, on the peripheral surface of the core portion. Is a ridge that protrudes radially outward from the peripheral surface of the core portion by the winding member, and a ridge that is recessed radially inward from the peripheral surface of the core portion in a region that does not overlap the winding member. And are provided.

  According to this configuration, the peripheral surface of the core portion is radially inward from the peripheral surface of the core portion, in addition to the ridges protruding from the peripheral surface of the core portion by the winding member toward the radially outer side of the core portion. There is a groove that is dented toward. Therefore, the contact area with respect to the concrete of a fiber reinforced resin rod can be increased compared with the case where only a protrusion or only a recess is provided on the peripheral surface of the core. Therefore, the adhesive force with respect to concrete can be improved.

  In the fiber reinforced resin rod, the recess is also provided in a region overlapping the winding member on the peripheral surface of the core, and the recess provided in a region of the recess that does not overlap the winding member. When the strip is the first recess and the recess provided in the region overlapping with the winding member is the second recess, the winding member is preferably fitted in the second recess.

According to this structure, since the winding member is fitted in the second concave strip, the positional deviation of the winding member with respect to the core portion can be suppressed.
In the fiber reinforced resin rod, it is preferable that the second recess is provided with a recess that is shallower than the first recess.

  According to this configuration, by making the dent of the second groove shallower than the first groove, the winding member fitted into the second groove causes the core portion to radially outward from the peripheral surface. It is possible to secure the protruding amount of the ridge protruding toward the surface. That is, the adhesion force of the fiber reinforced resin rod to the concrete by the winding member can be ensured.

  In the fiber reinforced resin rod, when the depth (d) of the recess is 10 mm ≦ D ≦ 25 mm with respect to the diameter (D) of the core, 0.03D ≦ d ≦ 0.125D It is preferable that

  Generally, the deeper the recess of the groove provided in the core portion, the better the adhesion of the fiber reinforced resin rod to the concrete. However, on the other hand, the tensile strength of the fiber-reinforced resin rod decreases as the depth of the recess provided in the core portion increases. In this respect, according to this configuration, it is possible to achieve both adhesion force to the concrete and tensile strength of the fiber reinforced resin rod.

In the fiber reinforced resin rod, the winding member is preferably a filament yarn.
According to this configuration, since the filament yarn is easily impregnated with the resin, the winding member can be fixed to the core portion when the core portion is hardened with the resin.

  Moreover, the manufacturing method of the fiber reinforced resin rod which solves the said subject does not overlap a 1st winding member and a 2nd winding member mutually on the surrounding surface of the core part comprised with the fiber bundle containing an inorganic fiber, and At least the first winding member bites into the peripheral surface of the core portion, while at least the second winding member winds so as to protrude from the peripheral surface of the core portion, and the first winding member and the second winding member Curing the resin impregnated in the core part wound around the core, and removing the first winding member from the core part cured with the impregnated resin.

  According to this configuration, by removing the first winding member wound around the peripheral surface of the core portion, a concave streak is formed on the peripheral surface of the core portion, while being wound around the peripheral surface of the core portion. By not removing the second wrapping member, a protrusion is formed on the peripheral surface of the core portion, so that the contact area with the concrete can be increased. Therefore, the adhesive force with respect to concrete can be improved.

In the method for manufacturing a fiber reinforced resin rod, the first winding member is preferably a spun yarn.
According to this configuration, since the spun yarn is difficult to be impregnated with the resin, the first winding member can be easily removed from the core portion solidified with the resin.

The top view which shows a part of longitudinal direction of the fiber reinforced resin rod in embodiment. (A) is a perspective sectional view of a fiber reinforced resin rod, (b) is an enlarged view of portion A in FIG. 2 (a). The partial plane sectional view of a fiber reinforced resin rod. The top view when winding a 1st winding member and a 2nd winding member around a core part. The partial cross-sectional view when the core part by which the 1st winding member and the 2nd winding member were wound was hardened with resin. The partial plane sectional view which shows the state of the fiber which comprises the core part of a fiber reinforced resin rod. The fragmentary flat sectional view which shows the modification of a fiber reinforced resin rod.

Hereinafter, an embodiment of a fiber reinforced resin rod will be described with reference to the drawings.
As shown in FIGS. 1 and 2 (a) and 2 (b), the fiber reinforced resin rod 11 includes a cylindrical core portion 12 provided so that the left-right direction is the longitudinal direction in FIG. And a non-removable winding member (winding member, second winding member) 13 wound around the peripheral surface. The core part 12 is composed of a fiber bundle 15 in which a plurality of fibers 14 are aligned in one direction. That is, the longitudinal direction of the core portion 12 coincides with the longitudinal direction of the fibers 14. The fibers 14 constituting the core portion 12 are configured to include inorganic fibers such as glass fibers, carbon fibers, and basalt fibers. In the present embodiment, the fibers 14 are configured from basalt fibers. In general, inorganic fibers are known to exhibit excellent tensile strength in the longitudinal direction of the fibers 14, and basalt fibers are particularly excellent in tensile strength.

  The non-removable winding member 13 wound around the core portion 12 is formed of a long member such as a thread or a string, and is wound spirally at a constant pitch along the longitudinal direction of the core portion 12. The non-removable winding member 13 is composed of a filament yarn made of long fibers, and in this embodiment, a nylon fiber that is a kind of synthetic fiber (a crimped yarn is preferred, but a non-crimped yarn may also be used). It is composed of When the non-removable winding member 13 is wound around the peripheral surface of the core portion 12, a protrusion that protrudes from the peripheral surface of the core portion 12 toward the radially outer side of the core portion 12 is formed on the peripheral surface of the core portion 12. It is formed in a spiral shape. That is, the non-removable winding member 13 forms a ridge that spirally protrudes from the peripheral surface of the core portion 12 in a state of being wound around the core portion 12.

  Further, on the peripheral surface of the core portion 12, there are provided first concave strips (concave strips) 16 having a spiral groove shape recessed from the peripheral surface of the core portion 12 toward the inside in the radial direction of the core portion 12. The first concave stripes 16 are provided in a spiral shape at a constant pitch along the longitudinal direction of the core portion 12 on the peripheral surface of the core portion 12. The first recess 16 is provided on the peripheral surface of the core portion 12 in an area that does not overlap with the non-removable winding member 13 that forms the protrusion. That is, when viewed from the longitudinal direction of the core portion 12, the peripheral surface of the core portion 12 has protrusions (non-removable wrapping member 13) that project from the peripheral surface of the core portion 12 and the peripheral surface as a reference. The first recesses 16 that are recessed are provided alternately. In the present embodiment, the non-removable winding member 13 and the first recess 16 are provided on the peripheral surface of the core portion 12 so as to extend in parallel with each other at equal intervals.

  As shown in FIGS. 2 (a) and 2 (b), in the peripheral surface of the core portion 12 that is the fiber bundle 15 of the plurality of fibers 14, a region that overlaps the non-removable winding member 13 includes Different second grooves (concave lines) 17 are provided. Similarly to the first groove 16, the second groove 17 also has a spiral groove shape that is recessed from the peripheral surface of the core 12 toward the inside in the radial direction of the core 12. The second recess 17 is formed in a spiral shape along the non-removable winding member 13 wound around the core portion 12. That is, the non-removable winding member 13 is wound around the peripheral surface of the core portion 12 in a state where the non-removable winding member 13 is fitted in the second concave strip 17 formed in a spiral shape on the peripheral surface of the core portion 12.

  As shown in FIG. 3, the first recess 16 and the second recess 17 provided on the peripheral surface of the core portion 12 have a core portion so that the cross-sectional shape along the longitudinal direction of the core portion 12 is substantially semicircular. It is dented radially inward from the 12 circumferential surfaces. The depth d2 of the recess of the second recess 17 with respect to the peripheral surface of the core 12 is provided to be shallower than the depth d1 of the recess of the first recess 16.

  In the present embodiment, the depth (d) of the recesses 16 and 17 including the recess depth d1 of the first recess 16 and the recess depth d2 of the second recess 17 is the core portion. With respect to the diameter (D) of 12, when 10 mm ≦ D ≦ 25 mm, 0.03D ≦ d ≦ 0.125D is set. In general, the fiber reinforced resin rod 11 generally has a diameter (D) of the core portion 12 of 10 mm ≦ D ≦ 25 mm. In such a case, the depth (d) of the dent is “less than 0.03D”. This is because the adhesive strength to the concrete is weakened, whereas if the depth (d) of the dent is “over 0.125D”, the tensile strength decreases.

  The fiber reinforced resin rod 11 is solidified by the resin 18 in a state in which the protrusions by the non-removable winding member 13 and the first recesses 16 of the spiral groove are formed on the peripheral surface of the core portion 12. This resin 18 is composed of a thermosetting resin or a thermoplastic resin, and impregnates not only the peripheral surface of the fiber reinforced resin rod 11 but also the fiber bundle 15 and the non-removed winding member 13 constituting the core portion 12. Has been cured. The core 12 is configured such that the fibers 14 are aligned in one direction, so that the resin 18 is easily impregnated. Similarly, the non-removable winding member 13 is composed of filament yarns made of long fibers, so that the resin 18 is easily impregnated. Therefore, the non-removable winding member 13 is fixed to the core portion 12 through the impregnated resin 18.

Next, the manufacturing method of the fiber reinforced resin rod comprised as mentioned above is demonstrated.
As shown in FIG. 4, first, the non-removed winding in which the resin is impregnated on the peripheral surface of the core portion 12 composed of the fiber bundle 15 in which a plurality of fibers 14 previously immersed in the resin 18 are aligned. The attached member 13 and the removed winding member 19 not impregnated with the resin are wound. At this time, the non-removable winding member 13 and the removal winding member 19 are spirally wound at a constant pitch along the longitudinal direction of the core portion 12 so as not to overlap each other. The removal winding member 19 wound around the core portion 12 is a long member made of, for example, a thread or a string, and is made of a spun yarn made of short fibers. In addition, in this embodiment, the removal winding member 19 is comprised with the cotton string, and the diameter of the non-removal winding member 13 and the removal winding member 19 is comprised so that it may become substantially the same.

  As shown in FIG. 5, when the non-removable winding member 13 and the removed winding member 19 are wound around the peripheral surface of the core portion 12, the non-removable winding member 13 and the removed winding member 19 are peripheral surfaces of the core portion 12. The first recess 16 and the second recess 17 in which the non-removal winding member 13 and the removal winding member 19 are fitted are formed on the peripheral surface of the core portion 12 in a spiral shape. Is done. At this time, the non-removed winding member 13 is more core than the removed winding member 19 so that the depth d2 of the recess of the second recess 17 is shallower than the depth d1 of the recess of the first recess 16. It is weakly wound around the portion 12. At this time, the non-removal winding member 13 and the removal winding member 19 are wound such that the side opposite to the side that bites into the peripheral surface of the core portion 12 protrudes from the peripheral surface of the core portion 12. Therefore, spiral ridges are formed on the peripheral surface of the core portion 12 by the wound non-removable winding member 13 and the removed winding member 19.

  Next, the resin 18 impregnated in the core portion 12 and the non-removable winding member 13 is cured. As the impregnated resin 18 is cured, the core portion 12 and the non-removed winding member 13 are integrally hardened in a state where the first concave stripe 16 and the second concave stripe 17 are formed on the peripheral surface of the core portion 12. It is done. The non-removable winding member 13 made of filament yarn is easily impregnated with the resin 18, while the removed winding member 19 is made of span yarn, so that the resin 18 is hardly impregnated. Therefore, even if the removal winding member 19 not impregnated with the resin is wound around the peripheral surface of the core 12 impregnated with the resin, the penetration of the resin from the core 12 side to the removal winding member 19 is suppressed. Is done. Therefore, the removal winding member 19 can be easily removed even after the resin 18 impregnated in the core portion 12 or the like is cured.

  Next, as shown in FIG. 6, the removal winding member 19 (illustrated by a two-dot chain line in FIG. 6) wound around the peripheral surface is removed from the core portion 12 solidified by the resin 18. Here, since the removal winding member 19 is configured to be hard to be impregnated with the resin 18 as described above, the removal winding member 19 is not fixed to the core portion 12 via the impregnated resin 18 and is easily removed from the core portion 12. is there. By removing the removal winding member 19 from the core portion 12, the spiral first recess 16 formed on the peripheral surface of the core portion 12 is exposed. Through the above steps, the fiber-reinforced resin rod 11 including the ridges formed by the non-removable winding member 13 and the recesses (first recess 16) formed by the removal winding member 19 is manufactured.

Next, the operation of the fiber reinforced resin rod configured as described above will be described.
The non-removable winding member 13 and the removed winding member 19 wound around the core portion 12 formed of the fiber bundle 15 composed of a plurality of fibers 14 tighten the core portion 12 in order to improve the density of the core portion 12. It is common to wind like this. By increasing the density of the fibers 14 constituting the core portion 12, the fiber reinforced resin rod 11 having excellent tensile strength can be obtained. For this reason, the first groove 16 and the second groove 17 having a spiral groove shape are formed on the peripheral surface of the core portion 12 by tightening the non-removal winding member 13 and the removal winding member 19. And by removing the removal winding member 19 from the core portion 12 and not removing the non-removal winding member 13, the peripheral surface of the core portion 12 is provided with irregularities, and the fiber reinforced resin rod 11 bites into the concrete. That is, the adhesion force of the fiber reinforced resin rod 11 to the concrete is improved. In addition, the adhesion force with respect to the concrete of the fiber reinforced resin rod 11 is improved, so that the protrusion amount of the protrusion provided in the surrounding surface of the core part 12 is large, and the depth of a recess is deep. Therefore, as shown in FIG. 3, on the circumferential surface of the core portion 12, the depth d <b> 2 of the second recess 17 is shallower than the depth d <b> 1 of the first recess 16, thereby removing the winding. The non-removable winding member 13 having a diameter substantially the same as that of the attaching member 19 ensures a protruding amount of a portion functioning as a ridge.

  However, on the other hand, as shown in FIG. 6, the first recess 16 and the second recess 17 are formed on the peripheral surface of the core portion 12 by tightening the non-removal winding member 13 and the removal winding member 19. As a result, a part of the fibers 14 constituting the core 12 is bent. In particular, the fibers 14 constituting the vicinity of the peripheral surface of the core portion 12 are easily bent greatly. The fibers 14 bent inward in the radial direction of the core portion 12 are formed by the first concave stripe 16 and the second concave stripe 17 formed on the peripheral surface of the core portion 12 when a tensile force is applied in the longitudinal direction of the core portion 12. Since it tries to deform | transform in the direction (diameter direction outer side of the core part 12) which makes a dent shallow, the contribution to the tensile strength in the fiber reinforced resin rod 11 reduces. Further, by deforming so that the recess of the second recess 17 is shallow, the position of the non-removable winding member 13 fitted in the second recess 17 is shifted on the peripheral surface of the core portion 12 or is not A strong tension acts along the longitudinal direction of the removal winding member 13, and the non-removal winding member 13 may be broken. That is, since the bending amount of the fiber 14 and the number of the fibers 14 to be bent increase as the depths d1 and d2 of the recesses of the first recess 16 and the second recess 17 increase, the fiber reinforced resin rod 11 There is a possibility that the tensile strength is lowered. Therefore, the fiber reinforced resin rod 11 according to the present embodiment is based on the result obtained through experiments, and the first concave stripes under the condition that the diameter (D) of the core 12 is 10 mm or more and 25 mm or less. The depth d (d1, d2) of the recesses 16 and the second recess 17 is determined to satisfy 0.03D ≦ d ≦ 0.125D.

According to the above embodiment, the following effects can be obtained.
(1) On the peripheral surface of the core portion 12, in addition to the ridges protruding from the peripheral surface of the core portion 12 toward the radially outer side of the core portion 12 by the non-removable winding member 13, from the peripheral surface of the core portion 12 The first groove 16 is formed as a groove that is recessed radially inward. Therefore, the contact area with respect to the concrete of the fiber reinforced resin rod 11 can be increased as compared with the case where only the ridges or only the ridges are provided on the peripheral surface of the core portion 12. Therefore, the adhesion force of the fiber reinforced resin rod 11 to the concrete can be improved.

(2) Since the non-removable winding member 13 is fitted in the second recess 17, the displacement of the non-removable winding member 13 with respect to the core portion 12 can be suppressed.
(3) The peripheral surface of the core portion 12 is formed by the non-removed winding member 13 fitted in the second concave strip 17 by making the concave portion of the second concave strip 17 shallower than the concave portion of the first concave strip 16. It is possible to ensure the protruding amount of the protrusions protruding from the core 12 toward the outer side in the radial direction. That is, the adhesion force of the fiber reinforced resin rod 11 to the concrete by the non-removable winding member 13 can be ensured.

  (4) Generally, the adhesion of the fiber reinforced resin rod 11 to the concrete is improved as the recesses of the first recess 16 and the second recess 17 provided in the core 12 are deeper. However, on the other hand, the tensile strength of the fiber reinforced resin rod 11 decreases as the recesses of the first recess 16 and the second recess 17 provided in the core 12 become deeper. In that respect, when the depth (d) of the recesses of the first recess 16 and the second recess 17 is 10 mm ≦ D ≦ 25 mm with respect to the diameter (D) of the core 12, 0.03D ≦ By setting so as to satisfy d ≦ 0.125D, it is possible to achieve both adhesion force to the concrete and tensile strength in the fiber reinforced resin rod 11.

(5) Since the filament yarn is easily impregnated with the resin 18, the non-removable winding member 13 can be fixed to the core portion 12 when the core portion 12 is hardened with the resin 18.
(6) By removing the removal winding member 19 wound around the peripheral surface of the core portion 12 and not removing the non-removable winding member 13 wound around the peripheral surface of the core portion 12, the core portion 12 is removed. Since unevenness is formed on the peripheral surface of the fiber, the contact area of the fiber reinforced resin rod 11 with the concrete can be increased. Therefore, the adhesion force of the fiber reinforced resin rod 11 to the concrete can be improved.

  (7) Since the spun yarn is difficult to be impregnated with the resin 18, the removal winding member 19 is not fixed to the core 12 when the core 12 is hardened with the resin 18. That is, the removal winding member 19 can be easily removed from the core portion 12 solidified with the resin 18.

In addition, you may change each said embodiment as follows.
As shown in FIG. 7, in the above embodiment, the non-removable winding member 13 is not limited to a thread or string, but is a long profile extruded material 20 made of, for example, extruded nylon or TPE. May be. If the profile extruded material 20 is made of a flexible material, it can be wound around the peripheral surface of the core 12 and the cross section thereof is limited to a substantially circular shape like a thread or string. Absent. Then, as shown in FIG. 7, the deformed extruded material 20 is molded so that the cross section thereof has a triangular shape, so that a contact area with the peripheral surface of the core portion 12 is ensured in the wound state, and the core portion 12. Even if it is the structure which does not provide the 2nd groove 17 in the surrounding surface of this, the possibility that the profile extruded material 20 may shift in position on the surrounding surface of the core part 12 can be reduced. Further, the deformed extruded material 20 can be fixed to the core portion 12 by forming the resin 18 impregnated in the core portion 12 with a material having good adhesiveness. Moreover, the cross section of the profile extruded material 20 is not limited to a triangular shape, and may be a rectangular shape. In addition, the structure by which the 2nd groove 17 is provided in the surrounding surface of the core part 12 along the profile extrusion material 20 may be sufficient.

  In the above embodiment, the fiber-reinforced resin rod 11 is manufactured by removing the removed winding member 19 from the core portion 12 in a state where the resin 18 impregnated in the core portion 12 is semi-cured, and then the resin 18 It may be a method of manufacturing by completely curing.

-In the said embodiment, the cross-sectional shape of the 1st groove 16 and the 2nd groove 17 provided in the surrounding surface of the core part 12 is not only a substantially semicircle shape, but the shape used as an inverted triangle, a rectangular shape, etc. May be.
In the above embodiment, the relationship between the depth d1 of the recess of the first recess 16 and the depth d2 of the recess of the second recess 17 is the depth d1 of the recess of the first recess 16 ≦ the second recess. The relationship of the depth d2 of 17 dents may be sufficient.

  In the above embodiment, the fibers 14 constituting the core portion 12 may be inorganic fibers other than basalt fibers such as glass fibers and carbon fibers, or may be composed of a plurality of types of fibers 14. Moreover, you may be comprised including the fibers 14 other than inorganic fibers, such as a synthetic fiber.

  In the above embodiment, the pitch of the non-removable winding member 13 and the removal winding member 19 wound around the peripheral surface of the core portion 12 may change during the winding, or may not be wound so as to extend parallel to each other. . Further, the non-removal winding member 13 and the removal winding member 19 are not substantially the same diameter, and may have different diameters.

  In the above embodiment, the first recess 16 that is recessed with respect to the peripheral surface of the core portion 12 and the protrusion that protrudes with reference to the peripheral surface of the core portion 12 (non-removable winding member 13) are the periphery of the core portion 12. They may be provided so as to extend non-parallel to each other on the surface.

  In the above embodiment, the number of spiral ridges and ridges formed on the peripheral surface of the fiber reinforced resin rod 11 may be changed as appropriate. For example, it is good also as a structure which winds the two non-removable winding members 13 and provides two convex strips on the peripheral surface of the core portion 12, or removes the core after removing the two wound winding members 19 after winding them. The structure which provides the two 1st concave strips 16 exposed to the surrounding surface of the part 12 may be sufficient.

  In the above embodiment, the non-removable winding member 13 is not limited to a filament yarn made of nylon fiber, but may be a member made of another synthetic fiber such as polypropylene or a basalt fiber, and is not limited to a filament yarn. In short, any material that can be easily impregnated with the resin 18 while being wound around the peripheral surface of the core 12 may be used.

In the above embodiment, the removal winding member 19 is not limited to a spun yarn such as a cotton string, but may be any material that is difficult to be impregnated with the resin 18.
In the above embodiment, the method of impregnating the core 18 around which the non-removable winding member 13 and the removed winding member 19 are impregnated with the resin 18 includes the core 12 together with the non-removable winding member 13 and the removed winding member 19. Not only the method of immersing the resin in the resin 18, but also impregnation by spraying or spraying.

  -In the said embodiment, the diameter of the non-removable winding member 13 is made smaller than the diameter of the removal winding member 19, so that the second recess 17 formed on the peripheral surface of the core portion 12 during winding is provided. The depth d2 of the recess may be made shallower than the depth d1 of the recess of the first groove 16.

  -In above-mentioned embodiment, the core part 12 may be not only the structure by which a cross section becomes a perfect circle shape, but the structure by which an ellipse shape may be sufficient.

DESCRIPTION OF SYMBOLS 11 ... Fiber reinforced resin rod, 12 ... Core part, 13 ... Non-removal winding member (winding member, 2nd winding member), 14 ... Fiber, 15 ... Fiber bundle, 16 ... First groove (concave) , 17 ... 2nd groove (concave), 18 ... Resin, 19 ... Removal winding member (first winding member), d, d1, d2 ... Depth depth, D ... Diameter.

Claims (7)

A core composed of a fiber bundle containing inorganic fibers;
A winding member wound around the peripheral surface of the core,
On the peripheral surface of the core portion, a ridge that protrudes radially outward from the peripheral surface of the core portion by the winding member, and a diameter from the peripheral surface of the core portion in a region that does not overlap the winding member. A fiber-reinforced resin rod provided with a groove that is recessed inward. The recess is also provided in a region overlapping the winding member on the peripheral surface of the core part,
Among the concave strips, when the concave strip provided in a region that does not overlap the winding member is a first concave strip, and the concave strip provided in a region overlapping the winding member is a second concave strip,
The fiber-reinforced resin rod according to claim 1, wherein the winding member is fitted in the second recess.   The fiber-reinforced resin rod according to claim 2, wherein the second recess is provided with a recess that is shallower than the first recess.   The depth (d) of the recess of the recess is 0.03D ≦ d ≦ 0.125D when 10 mm ≦ D ≦ 25 mm with respect to the diameter (D) of the core portion. Item 4. The fiber-reinforced resin rod according to any one of Items 3 to 3.   The fiber-reinforced resin rod according to any one of claims 1 to 4, wherein the winding member is a filament yarn. While the first winding member and the second winding member do not overlap each other on the peripheral surface of the core portion formed of a fiber bundle containing inorganic fibers, and at least the first winding member bites into the peripheral surface of the core portion Winding at least the second winding member so as to protrude from the peripheral surface of the core,
Curing the resin impregnated in the core around which the first winding member and the second winding member are wound;
Removing the first wound member from the core portion in which the impregnated resin is cured, and a method for producing a fiber-reinforced resin rod.   The method for producing a fiber-reinforced resin rod according to claim 6, wherein the first winding member is a spun yarn.

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