JPS61235115A - Manufacture of reinforcing member having protrusion on surface thereof - Google Patents

Abstract

PURPOSE:To form protrusions on the surface of the reinforcing member effectively by a method wherein synthetic resin forming material, including continuous reinforcing fibers, is introduced into a compression forming mold to form the reinforcing member having protrusions on the surface thereof by compression forming, thereafter, the compression forming mold is released to pull out the reinforcing member while this operation is repeated. CONSTITUTION:The continuous reinforcing fibers 1 are introduced into the tank 2 of uncured thermosetting resin to impregnate the resin into the fibers. The amount of impregnated resin is regulated by a squeeze 4, the squeezed resin is introduced into the compression forming mold 6 together with the reinforcing fibers 3 if necessary and compression molding is effected whereby the reinforcing member, having protrusions on the surface thereof, is formed. The reinforcing member, formed by compression, is pulled out by a take-off device 7 as the compression forming mold is being opened and the resin is cured, thereafter, the member is cut by a cutter 8 into a required length. In case the reinforcing member, formed by compression forming, is pulled out of the compression forming mold 6, the resin impregnated reinforcing fibers, which are continuous to the formed reinforcing member, are introduced into the forming mold 6, therefore, continuous compression forming may be effected by repeating above- described operations.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for continuously manufacturing a synthetic resin reinforcing member having projections on its surface.

[Conventional technology]

It is known to drill holes in rock and embed reinforcing members called rock bolts in order to secure the rock in a tunnel. Steel rock bolts corrode in high-temperature, humid environments such as inside tunnels, and corrode.
As strength and rigidity decrease, synthetic resin rock bolts are attracting attention as they are corrosion resistant and easy to work with.

Furthermore, synthetic resin reinforcing members that can replace reinforcing bars are attracting attention from the viewpoint of corrosion resistance in reinforcing members for concrete and the like. In such reinforcing members, it is considered effective to provide protrusions on the surface in order to improve adhesion to rock or concrete.

[Problem to be solved by the invention]

In order to obtain tensile strength equal to or higher than that of steel reinforcement members,
Reinforcing members made of synthetic resin are usually filled with reinforcing fibers having high tensile strength, such as carbon fibers, in the longitudinal direction of the reinforcing member.

As a manufacturing method, a pultrusion method is often adopted because productivity is high when filling reinforcing fibers that are continuous in the longitudinal direction of the reinforcing member. On the other hand, in order to increase the adhesion strength with concrete or rock, it is common practice to provide projections on the surface of reinforcing members, but when the projections are continuously provided parallel to the longitudinal direction of the reinforcing member, Although pultrusion is possible, pultrusion is not possible in the case of protrusions that are at a certain angle to the longitudinal direction or are discontinuous even if they are parallel, and a decrease in productivity can be avoided. do not have.

[Means for solving problems]

The present invention provides a method for efficiently manufacturing a synthetic resin reinforcing member having protrusions on the surface that cannot be particularly pultruded. A reinforcing member having protrusions on the surface is formed by compression molding, and then the compression molding mold is opened and the reinforcing member is pulled out.At the same time, the molding material connected to the reinforcing member is introduced into the compression molding mold. The present invention relates to a method for manufacturing a reinforcing member having protrusions on its surface, which is characterized in that the mold is closed again and compression molding is repeated.

Attached FIG. 1 shows a typical manufacturing method example of the present invention, and fi
Fig. ).

The present invention will be described with reference to FIG. 1. Continuous reinforcing fibers (1) such as mats or rovings are introduced into an uncured thermosetting resin bath 12), and the fibers are impregnated with resin. Adjust the amount of impregnated resin by squeezing (4) C1 If necessary, pass it through the preforming mold (5) or not, and then into the compression molding mold (6) together with the continuous reinforcing fibers (3) that are not impregnated with resin. A reinforcing member having protrusions on the surface is formed by introducing and compression molding. In this method, after or while opening the compression mold, the compression molded reinforcing member is pulled out from the take-up device (7) K, and after the resin has solidified, it is cut into the required length with a cutter (8). .

When pulling out the compression molded reinforcing member from the compression mold (6), the resin-impregnated reinforcing fibers connected to it are removed from the mold (6).
Since the resin is introduced into the mold, compression molding can be performed repeatedly and continuously.

In the method of the present invention, unlike pultrusion molding, it is possible to open the mold and take it out, and even if there is a protrusion α2 having a certain angle with respect to the drawing direction as shown in FIG. I can do it. Such protrusions α2 are important for increasing the adhesion strength between the reinforcing member and concrete or rock, and the method of the present invention is particularly effective in manufacturing reinforcing members having such protrusions. Alternatively, even if there is only a protrusion parallel to the drawing direction, for example (11) in Fig. 2, if you want it to be discontinuous in the length direction, it cannot be obtained by pultrusion. However, the method of the present invention is effective.

It is preferable that the protrusions 9 and α2 are sufficiently filled with reinforcing fibers, since these are parts of concrete or rock that are particularly subjected to force. In addition, it is preferable that the reinforcing fibers in the protrusions are continuous with the reinforcing fibers that exist outside the protrusions, but for this reason, K is suitable for mats, cloths, bias cloths, etc. that easily follow the flow of resin. Alternatively, reinforcing fibers made of nonwoven fabrics may be arranged on the surface of the reinforcing member. The resin-impregnated reinforcing fibers to be introduced into the compression molding mold may have an uncured resin or may not be subjected to preforming (5), but the reinforcing fibers may have a shape similar to the final cross-sectional shape of the reinforcing member in the preforming mold. The resin may be preformed into a shape or preheated to a semi-hardened state, and then compression molded. Some of the reinforcing fibers, especially those forming the surface part of the reinforcing member, are introduced directly into the preforming mold or compression molding mold without passing through the resin tank (2) as shown in Figure 1 (3), and are impregnated with resin and reinforced. Compression molding may be performed while sandwiching the fibers. This can prevent the resin from dripping. Further, materials such as prepregs and premixes such as SMC and BMC may be used in combination.

The shape of the reinforcing member is preferably cylindrical or prismatic, as shown in its longitudinal cross section in FIG. 5, but it may also be a plate with a flat cross section. The center of the reinforcing member is preferably provided with longitudinally continuous reinforcing fibers, such as glass fiber rovings or carbon fiber tows (corresponding to rovings); As a reinforcing member,
A fiber-reinforced synthetic resin may be placed on the outer periphery, and projections may be provided on the outer periphery surface according to the method of the present invention. The reinforcing member of the present invention can be used as a rock bolt or reinforcing member, or as a prestressed concrete member. As the material of the reinforcing fibers, carbon fibers are preferable because they have particularly high tensile strength, and acrylic fiber-based, pitch-based, rayon-based carbon fibers, and the like may be used. In addition to carbon fibers, inorganic fibers such as glass fibers, boron fibers, and various metal fibers, or natural or synthetic fibers such as hemp, vinylon, polyamide, and polyester may also be used, and these can be used alone or in combination of two or more types. . Various types of reinforcing fibers can be used, such as chopped strand mats, continuous strand mats, surfaging mats, non-woven fabrics, cloths, bias cloths, and rovings, either singly or in combination. , roving-like reinforcing fibers are preferable, and continuous strand mat-like reinforcing fibers are preferable on the surface portion. On the other hand, when the resin constituting the reinforcing member is used for reinforcing concrete IJ-T, epoxy resin or epoxy acrylate resin is preferable because it is strong against the alkalinity of concrete. Thermosetting resins such as polyester resins and phenol resins may be used, and thermoplastic resins such as polycarbonate resins, polyvinyl chloride resins, and polypropylene resins may be used. The filling ratio of reinforcing fibers in the reinforcing member is 40 to 80 vol%, preferably 60 to 8 vol. to ensure sufficient strength and rigidity of the reinforcing member.
It is preferable to select from a range of 0 vol. Further, it is preferable that the reinforcing fibers in the protrusions on the surface are filled in an amount of at least 10 vol To.

〔Example〕

Unit weight 2. zzr/m glass rovings were taken out from 45 rolls, impregnated with a liquid resin containing epoxy acrylate resin and organic peroxide, and the roving bundle that came out of the impregnation tank was passed through a squeeze hole with a diameter of 8 earthquakes. urge Unit weight 450t 7m on both sides of roving bundle
The continuous strand mat from No. 2 was attached with 62 tape-shaped mats with a width of 20 mm, introduced into a compression mold, and molded with a molding pressure of 50 kg/ass in a mold at 130°C for 3 minutes. The length of the mold is 3 m.

After opening the mold, the molded product is pulled out by the length of the mold using a take-off roller, and press molding is started again. With this method, the diameter is F!
A reinforcing member having a width of 2 mm and a height of 2 mm perpendicular to the length direction was obtained on a -5 wm glass fiber reinforced round bar.

Note that during the forming, the roving bundle was subjected to five tensions to prevent loosening. Furthermore, by providing a heating furnace before the roving bundle enters the mold, it was possible to improve the roundness of the bundle.

〔Effect of the invention〕

According to the method of the present invention, protrusions can be efficiently formed on the surface of a reinforcing member made of fiber-reinforced synthetic resin. Since a compression mold can be used, protrusions of various shapes can be easily formed in any direction. Since the center portion of the reinforcing member and the protrusion can be integrally provided via continuous reinforcing fibers, there is an advantage that the protrusion is less likely to be destroyed.

BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic side view showing an example of the method of the present invention. Figures 2(a) to 3(a) are front views showing examples of reinforcing members having protrusions on the surface that can be manufactured by the method of the present invention. Figures 3(a) to 3(b) are cross-sections perpendicular to the longitudinal direction of the reinforcing members. Schematic diagram showing.

5... Preforming mold 6...Compression mold 11...Protrusions parallel to the length direction of the reinforcing member.

12...Protrusion with a certain angle to the length direction of the reinforcing member.

Claims (1)

[Claims] 1. A synthetic resin molding material containing continuous reinforcing fibers is introduced into a compression molding mold, compression molding is performed to form a reinforcing member having protrusions on the surface, and then the compression molding mold is opened, A method for producing a reinforcing member having protrusions on the surface, the method comprising: pulling out the reinforcing member, introducing the molding material connected to the reinforcing member into a compression mold, closing the mold again and repeating compression molding. 2. The manufacturing method according to claim 1, wherein the protrusions on the surface are continuous or discontinuous protrusions that are not parallel to the longitudinal direction of the reinforcing member. 3. The manufacturing method according to claim 1, wherein the protrusions on the surface are discontinuous protrusions parallel to the longitudinal direction of the reinforcing member.