JPS63219746A - Wire arrangement made of fiber reinforced synthetic resin having profile cross-section - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to reinforcement made of fiber-reinforced synthetic resin, and particularly to reinforcement made of fiber-reinforced synthetic resin having an irregular cross section and a method for manufacturing the same.

Fiber-reinforced reinforcing steel, which is made by impregnating reinforcing fibers such as glass fibers with thermosetting synthetic resins such as unsaturated polyester resin, has recently been introduced as a substitute for reinforcing bars for concrete buildings. Reinforcement made from resin (hereinafter referred to as "fiber-reinforced resin reinforcement") has been used in some areas.

This type of fiber-reinforced resin reinforcement generally has depressions of various shapes, or undercuts, formed on its outer circumferential surface in order to improve adhesion to concrete. It is common practice to have an irregularly shaped cross section.

However, the current situation is that there is still no method to produce fiber-reinforced resin reinforcing bars having such irregular cross-sections with good dimensional accuracy and high productivity.

Moreover, it has an irregular cross section with an undercut like this! In the case of a-fiber-reinforced resin reinforcement, the reinforcing m-fibers embedded in the main body as a reinforcing material in the longitudinal direction are cut at the undercut portion, so that the reinforcing fibers continuously penetrate through the main body. There are problems in that the number of fibers that act effectively as a carbon fiber is reduced, resulting in a decrease in its strength, or that the diameter of the main body must be increased in order to exhibit a predetermined strength.

Therefore, the present invention aims to obtain fiber-reinforced resin reinforcing bars having this kind of irregular cross-section without reducing the original strength, and to achieve this reinforcement arrangement with good dimensional accuracy and high productivity. To obtain a new manufacturing method that can be manufactured with
This is its main purpose.

In order to achieve this object, the present invention, which is based on s 7t, includes undercut portions having a desired number and contour on the outer peripheral surface of a rod-shaped main body made of a synthetic resin reinforced with reinforcing fibers. In the fiber-reinforced synthetic resin bar arrangement having an irregular cross section, the main body is overlaid by winding reinforcing fibers approximately spirally along the outer peripheral surface including the undercut portion. It is characterized by fiber-reinforced synthetic resin reinforcing bars with irregular cross-sections in which windings are embedded, and in order to manufacture this reinforcing steel, liquid thermosetting synthetic resin is added to the rovings made of reinforcing fibers. impregnating the resin to create a preliminary resin-impregnated material; passing the preliminary resin-impregnated material through a die having a predetermined cross section to create a resin-impregnated material having a desired cross section; An overwinding resin-impregnated material is created by spirally winding reinforcing fibers at an appropriate pitch around the outer peripheral surface of the overwinding resin-impregnated material. It is drawn into the almost cylindrical mold at high speed to a predetermined position.
In this position, several insert pins, which are spaced at predetermined axial intervals, are inserted through the wall of the mold and approximately perpendicularly through the inner wall of the mold. Press toward the outer peripheral surface of the overwinding resin-impregnated material so that the end surface protrudes from the inner wall surface of the mold, thereby giving the outer peripheral surface of the overwinding resin-impregnated material a desired contour at a predetermined depth. Forming an undercut portion, heating the mold at the same time to heat and harden the liquid impregnated resin, and returning the end surface of the insert pin to the inner wall surface of the mold. Then, the undercut portion is formed and the heated and hardened resin-impregnated rope material is pulled out from the mold at a high speed to a predetermined length as a reinforcing synthetic resin reinforcement having an irregular cross section, and then stopped again. At this position, the overwinding resin-impregnated material newly drawn into the mold is subjected to the same operation as before using the insert pin to form an undercut on its outer circumferential surface, and then the above operations are performed. The present invention is characterized by a method for manufacturing fiber-reinforced synthetic resin reinforcing bars having an irregular cross section, which comprises repeating the steps.

JLJL Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 10 of the accompanying drawings, which show one embodiment of the invention and the outline of its manufacturing method.

First, in FIGS. 1 and 2, two examples of the 11-fiber-reinforced resin reinforcement having irregular cross sections according to the present invention are partially shown in perspective views, and the reinforcement 50 shown in FIG. teeth,
This is an example in which undercut portions 52 having a circular cross section with a certain radius are formed at a certain depth at intervals in the longitudinal direction of the main body on the outer peripheral surface of the main body having a circular cross section, and The reinforcement arrangement 50 shown in FIG. 2 is an example in which undercut portions 54 having a rectangular cross section with a certain side length are formed at a certain depth at intervals in the longitudinal direction of the main body. Furthermore, this second example shows an example in which the undercut portions 54 are arranged on diametrically opposed surfaces of the main body so as to be offset from each other in the longitudinal direction.

Further, FIG. 3 is a model diagram showing the internal structure of the reinforcement 50 according to the present invention having such a shape. A thread made of reinforcing fibers, such as glass fibers, carbon edge Ill, etc., is continuously wound spirally along the surface, not only on the outer peripheral surface of the main body but also on the undercut portions 52 and 54. Overwinding 20 by
is embedded in such a way that it surrounds the actual reinforcing fibers 21, such as glass fibers, carbon fibers, etc., which are continuously embedded in the cross section of the body in the longitudinal direction.

In this way, in the reinforcing reinforcement 50 according to the present invention, the reinforcing fibers forming the rovings 21 buried along the outer peripheral surface are cut in the longitudinal direction at the undercut portions 52, 54, etc. Therefore, even if its original strength may be reduced, the overwinding 20 can effectively compensate for the reduction in strength.

Next, a method according to the present invention for manufacturing fiber-reinforced resin reinforcing bars 50 having a modified cross section according to the present invention as illustrated in FIGS. 1 and 2 and whose structure is explained in FIG. , will be explained based on No. 412I, which schematically shows the outline of the equipment for its implementation.

As shown in the figure, first, a roving 1 made of glass fiber or the like, which is a reinforcing fiber (t), is made of thermosetting liquid polyester, vinyl ester, etc. contained in a tank 2 impregnated with liquid synthetic resin. Synthesis lj (by passing through the fat 3 to create a preliminary resin-impregnated material 5I in which the roving 1 is impregnated with the liquid resin 3, and passing this through an appropriate die 4, a VA fat-impregnated material having a predetermined cross-sectional dimension is produced. Next, while feeding this resin-impregnated material 5 at high speed in the direction of arrow
0 is strongly wound at an appropriate pitch to form an overwinding resin-impregnated material 5□, and this material 5
□ at high speed so as to penetrate the inner wall of a hollow cylindrical mold 6 having a predetermined length in the axial direction and having an inner wall with a cross section corresponding to the cross section of the main body of the reinforcement 50. Try to draw it in. This mold 6 has a preheating part 61 formed near its entrance by electrical heating or the like, and preheats the overwinding resin-impregnated material 52 to an appropriate temperature. Note that a cooling part 6 with a jacket structure is provided between the preheating part 61 and the mold body 62, and is designed to prevent 393 due to heat transfer from the main body part 6□ of the preheating part 6I. .

In this way, the preheated overwinding resin-impregnated material 5t is passed into the main body portion 62 of the mold 6, but this main body portion 6□ is heated to an appropriate temperature by electric heating or the like. , the overwinding resin-impregnated material 52 passing through this is heated and hardened. Further, in the main body portion 6° of the mold 6, one set of slide core units 78 are provided at the upper and lower portions of the mold 6 that are opposed to each other in the diametrical direction.
, 7□ are arranged, but each slide core unit 7
,． 7. are each several rod-shaped insert pins I
L, L are mounted vertically at a spacing corresponding to the axial spacing of the desired undercut, and these insert pins 8. .

82 movably penetrates the wall of the main body portion 8 □ of the mold 6 and can protrude from the inner wall surface by a dimension corresponding to the depth of the desired undercut portion, and each insert pin 8 ．． ．． 8. The cross section near the free end of the overwinding resin-impregnated material 5 is a cross section corresponding to the shape and dimensions of the undercut section to be provided on the outer peripheral surface of the overwinding resin-impregnated material 5. Shaped within the plane of the undercut.

Furthermore, the other ends of these insert pins 88, 8□ are each fixed to a common connecting member 9z, and each connecting member 91+9
□ indicates hydraulic cylinder 10. ．． 10. These hydraulic cylinders 10. ．． 10. , each insert pin L, L is connected to each connecting member 9I.
, 9□, they can be operated all at once toward the main body portion 62 of the mold 6 or away from the main body portion 62. In this way, the overwinding resin-impregnated material 5□ is applied to each slide core unit 7, . 7° insert pin 8. ．． 8. is in a state of retreating from the inner wall surface of the main body portion 62 of the gold IXL 6, it is drawn into the inside of the mold 6 from the cooling portion 61 near the liquid synthetic resin impregnated tank 2 at high speed, and its leading end is , the insert pin 81 furthest from the cooling part 61 of the mold 6,
When it reaches the vicinity of 8□, it is stopped, and at the same time, each hydraulic cylinder 10+, 10□ is activated, and each insert pin L, L protrudes a predetermined amount from the inner wall surface of the main body portion 6□ of the mold 6. This causes the overwinding impregnated resin wood inside the mold 6 to become 5. A predetermined undercut portion is formed on the outer circumferential surface of. In addition, in this case, the heated body portion 6□ of the mold 6
The overwinding resin-impregnated material 5□ is heated and hardened by the heat.

In this way, after the overwinding resin-impregnated material 5 is heated and hardened while forming an undercut portion, each insert pin 8. ．． 8. The free end surfaces of the hydraulic cylinders 10. , tow, it is pulled into substantially the same plane as the inner wall surface of the mold 6. In this state, the heated and hardened overwinding resin-impregnated material 52 is attached to each insert pin 8. and 8. The overwinding resin-impregnated material 5□, which has been drawn into the mold 6, is pulled forward again by the insert pins 84, 8□. The material is processed in the same manner as above to form the required undercut portion, and is heated and hardened. By repeating such operations intermittently, the Ia fiber-reinforced resin reinforcing bars 50 having a modified cross section with an undercut portion 52 or 54 are released from the mold 6 in the direction of arrow Y as a completed product. It will be withdrawn intermittently.

Note that FIG. 4 shows a facility in which undercut portions are formed on the main body of the reinforcement 50 in a staggered manner in the direction of the reinforcement technique, facing in the diametrical direction. , insert pin8. ．． By appropriately operating 82, it is also possible to form an undercut portion only on one side of the main body of the reinforcement in the technical direction.

Further, in FIG. 4, a heat insulation rA11 is also provided between the preheating portion 6I of the mold 6 and the main body portion 62 in order to block the transfer of heat between the two. ing.

Furthermore, insert pin 8. ．． 8. The shapes of the vicinity of the free end of the undercut section are shown in Figs. 5 to 7 and 8 to 10 for the case (52) and the case (54) of the undercut part having a circular cross section and a rectangular 4fi cross section, respectively. However, among these drawings, Figs. 5 and 8 show a front view, Figs. 6 and 9 show a plan view, and Figs. 7 and 10 show an end view, respectively.

In the method of the present invention, a mold 6, an insert pin 8. ．． m with irregular cross section using 8□
The manufacturing process is as follows.

That is, (roving 1> liquid resin impregnated - (pre-grained resin impregnated material S+) → passing through die 4 → (resin impregnated material 5) → overwinding → overwinding resin impregnated rope material 5 □) → into mold 6 High-speed retraction, stop, and operation of slide core unit 7+, L → heating and hardening of 1ffJ fat →
Return of slide core unit l-7, f2 → high-speed withdrawal.

Next, an experimental example of the manufacturing method according to the present invention will be explained.

衷二LJL Manufactured fiber-reinforced resin reinforcing bars whose main body diameter is 14 mm, and which has staggered undercuts with a cross section of 12+u+ diameter and a depth of 11 facing diametrically on the outer circumferential surface. In order to
Insert pins for each book 8. ．． Slide core unit 7, . 7. Incorporate and mold 6 to 140″″
C, and overwind the resin-impregnated material 5 into the inner wall at a drawing speed of 1.5 m/win.
□ and slide core unit 71. When the position of F2 is reached, the retraction is stopped, the slide core units 71, 7□ are activated, and the insert pins Lr8,
5. Overwinding the resin-impregnated material to a depth of ll1ii, respectively. and held in this state for 1 +*in. Thereafter, the slide core units 7I, 7□ are returned to their original positions, and the reinforcement body with the undercut portion formed and heated and hardened in this manner is removed from the main body in 1.
The previous operation was repeated again, moving in the same direction at a speed of about 210 m/am. In this way, fiber-reinforced resin reinforcement having a predetermined length and irregular cross section was completed. That is, in this experimental example, the molding was performed by indirect drawing for about 2107 cycles.

The composition of the liquid synthetic resin used in this experimental example was as follows. Namely, unsaturated polyester resin 155% 100% catalyst BPO paste 21Ii type agent Zinc stearate
3, and the glass content is 55% by volume.
Met.

Furthermore, in this experimental example, a reinforced yarn made of glass fiber was used for overwinding.

The fiber-reinforced synthetic resin reinforcing bars 50 having a modified cross section manufactured in this manner are already connected to two adjacent insert pins on its outer circumferential surface, as explained in a schematic diagram in FIG. 8. ．． 8. Or Fj formed by 82.8□! The strength of the outer circumferential portion 56 of the main body of the reinforcement remaining as a convex portion between the two contacting undercut portions 52 or 54 is such that the reinforcing fibers 1121 forming the roving 1 are By being cut in parts and losing its continuity, it cannot demonstrate its original strength, but instead,
Inside these convex parts 56, the reinforcing fiber threads wound to form overwinding 20 are maintained continuously through the main body and undercut part 52 or 54, so that the undercut Part 52 or 54
UC can completely compensate for the decrease in strength due to the cutting of the reinforcing fibers forming the roving 1.
It was confirmed that the reinforcing bars 50 according to the Kinotsu example can exhibit the desired strength.

Completion and treatment.

Since the present invention has the above-mentioned configuration, it provides a fiber-reinforced resin reinforcement having a modified cross section with a desired strength, and also allows the reinforcement to be formed in shape and size with good flexibility and with high productivity. This makes it possible to carry out GR manufacturing.

[Brief explanation of the drawing]

Figures 1 and 2 show the 2r! FIG. 3 is a schematic diagram showing one embodiment of overwinding according to the present invention, and FIG. 4 is a diagram showing an example of the arrangement of equipment for carrying out the method of the present invention. Figure, 5th
The figure is a front view showing the tip of an insert pin for forming an undercut when the planar outline of the undercut provided on the outer circumferential surface of the reinforcement is circular. FIG. 7 is a plan view, and FIG. 8 is a side view showing the end surface of the undercut. Similarly, FIG. 8 shows the tip of an insert pin for forming an undercut when the planar contour of the undercut is rectangular. FIG. 9 is a front view showing the portion, FIG. 9 is a plan view thereof, and FIG. 10 is a side view showing the end surface thereof. 1... Roving, 2... Liquid synthetic resin impregnated tank, 3... Liquid synthetic resin, 51... Preliminary resin impregnated window material, 5... Resin impregnated wood, 5□... Overwinding resin Impregnated material, 6... Mold, 61... Preheating part, 6□... Main body part, 6... Cooling part, 71.
7□...Slide core unit, 8+, s2...
Insert pin, 101, 102...hydraulic cylinder,
20... Overwinding, 21... Reinforcing fiber yarn forming roving, 50... Fiber reinforced synthetic resin reinforcement body having irregular cross section, 52.54.
...undercut 1~ part. Patent Applicant: Showa Kobunshi Co., Ltd. Figure 1 Captive neck Cutting diagram 3 Calculation diagram 4 + 1J2 Leather 5 Figure Kite diagram 8 Scheme diagram 10 Industry diagram 9

Claims (1)

[Scope of Claims] 1. A rod-shaped body made of synthetic resin reinforced with reinforcing fibers, and on the outer peripheral surface thereof undercut portions having a desired number and contour. The main body of the muscle has an irregular cross section in which reinforcing fibers are wound almost spirally along the outer circumferential surface of the main body, including the undercut portion, and overwinding is buried therein. Fiber-reinforced synthetic resin reinforcement. 2. The arrangement strut according to claim 1, wherein the reinforcing fibers for overwinding buried along the outer peripheral surface of the main body are made of threads such as glass fibers and carbon fibers. 3. A roving made of reinforcing fibers is impregnated with a liquid thermosetting synthetic resin to create a pre-resin-impregnated material, and the pre-resin-impregnated material is passed through a die having a predetermined cross section to obtain a desired cross section. The method includes: creating a resin-impregnated material having a surface, creating an overwinding resin-impregnated material by winding reinforcing fibers in a spiral shape at an appropriate pitch around the outer peripheral surface of the resin-impregnated material; The material is drawn at high speed into a substantially cylindrical mold having an inner wall of a predetermined cross section and elongated in the axial direction to a predetermined position, and is temporarily stopped at this position, and at this position, the wall of the mold Several insert pins are arranged at predetermined axial intervals so as to penetrate almost vertically through the inner wall of the mold, and are overwound with resin impregnated so that their end surfaces protrude from the inner wall surface of the mold. By pressing toward the outer peripheral surface of the material, thereby forming an undercut portion having a desired contour at a predetermined depth on the outer peripheral surface of the overwinding resin-impregnated material, and at the same time heating the mold. By heating and curing the liquid impregnated resin and returning the end face of the insert pin to the inner wall surface of the mold, the heated and hardened resin-impregnated material with the undercut portion formed in this way is shaped into a different shape. A predetermined length of fiber-reinforced synthetic resin reinforcement with a cross section is pulled out from the mold at high speed and stopped again, and at this position, the overwinding resin-impregnated material newly drawn into the mold is inserted with an insert pin. A fiber-reinforced synthetic resin product with an irregular cross section characterized by forming an undercut on its outer peripheral surface by performing the same operation as before, and then repeating the above operation. Manufacturing method for reinforcement. 4. The manufacturing method according to claim 3, wherein the reinforcing fibers are made of glass, polyamide resin, carbon, or the like. 5. Claim 3 or 4, wherein the thermosetting synthetic resin is an unsaturated polyester resin, vinyl ester resin, etc.
Manufacturing method described in section. 6. The manufacturing method according to claim 3, 4 or 5, wherein a set of insert pins are assembled together as a slide core unit and can be actuated by a hydraulic cylinder, an air cylinder, a cam mechanism, etc. 7. The manufacturing method according to claim 6, wherein each slide core unit is arranged to face each other in the diametrical direction of the mold. 8. The manufacturing method according to claim 7, wherein the insert pins of the diametrically opposed slide core units are arranged staggered from each other in the longitudinal direction of the mold. 9. The manufacturing method according to claim 7, wherein the insert pins of the diametrically opposed slide core units are arranged to face each other in the longitudinal direction of the mold. 10. The manufacturing method according to any one of claims 3 to 9, wherein the reinforcing fibers wound around the overwinding resin-impregnated material are made of thread-shaped glass fibers, carbon fibers, or the like.