JPS5845912A - Manufacture of fiber reinforced cylindrical cement product through press method - 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 has an axial strength of 12 ft (circumferential ) directional strength is 1
! The desired cylindrical shape (semi-cylindrical shape) with a uniform thickness or a uniform thickness and a central portion that protrudes in one direction in the thickness direction.
The fiber-reinforced cement product was produced by the known pressing method, that is, by supplying cement mortar mixed with reinforcing fibers between a pair of E-shaped formworks. This invention relates to a manufacturing method using mold clamping.

Conventionally, as a method similar to the E-tying method, the above-mentioned edge and fiber cement mortar C is sometimes referred to as FRC.

) is sprayed onto the entire lower formwork to a uniform or almost uniform thickness, and then a roller is used to remove air bubbles and finish the surface using a trowel. In the case of mold clamping, the fibers are fiLII in both the local direction and the axial direction, and the fibers in random positions are oriented almost uniformly in the axial direction and the same direction, so there is no difference in stiffness in both directions. Or, the strength is very small and is not practical as a manufacturing method for this kind of product which requires greater strength in the circumferential direction than in the axial direction, and furthermore, both ends of the lower formwork are sloped surfaces. Even if a thick layer of uncured FRc is sprayed on, that part tends to slip off the formwork surface, and when producing thick-walled products, it is necessary to use spray-up for that purpose. This process had to be repeated several times, and combined with the fact that degassing was done manually by an injured former employee, production efficiency was extremely poor. In addition, due to manual labor,
The inner surface could not be finished smoothly, and the charcoal lacked the rich taste.

In view of the above circumstances, the present invention improves and utilizes the previously known pressing method to efficiently finish products from thin to thick ★ in seconds, and moreover, with an eye-catching I! We have one purpose in proposing a 'pJ decision that will yield products with a high customer ratio.

The method of manufacturing fiber-reinforced cylindrical seven-piece products by the pressing method according to the present invention, which was developed to achieve the objective described in E. , the above-mentioned mold clamping is performed with an amount of the fiber-mixed cement mortar equivalent to the entire product being supplied to the bottom of the lower formwork. Therefore, FRC mainly flows in the W4 force direction, and as a result, most of the fibers are oriented in the circumferential direction.
! A product with a high ILB4 strength ratio can be obtained with certainty. In addition, since the specified shape is formed by clamping the upper and lower formwork pairs, it takes less time to remove bubbles from the wall than in the case of the old EgeD method, which requires degassing through the work of obtaining with a conventional trowel or roller. However, it is possible to obtain a product with a high φ ratio, smoothness on both the inner and outer surfaces, and a thickness suitable for one guest.In particular, the inner FE container As a result, we have been able to manufacture products that can effectively utilize the fiber effect.

Hereinafter, embodiments of the method of the present invention will be listed in order of steps based on illustrative drawings.

■ A cement mortar mixed with reinforcing fibers such as glass fibers, carbon fibers, or a mixture of both fibers is poured into the recessed bottom of the semi-cylindrical lower formwork ■) in an amount equivalent to the entire product. It is supplied almost uniformly in the longitudinal direction of the lower formwork (2) via the spray (3). (Refer to Figure 1) ■ The nine-vibration motor 14 attached to the lower formwork (2) is operated to vibrate the lower formwork (2), while the upper formwork (2) is vibrated.
1) to the lower formwork (2) side using hydraulic pressure, FRC is formed with the upper and lower formworks (1) and (2) pair 22! Shape it into a round shape 4 that matches the shape. (Refer to Figure 1) When the product has a high rising part as in the Kiryo method, the fluidity of the FRC is improved by adding shake-off when pressurizing, and the low φ pressurizing force is sufficient to reach the tip of the rising part. Since the FRC flows into the tank, it is particularly preferable to add vibration to the pressurization.

At this time, since FRO mainly flows in the circumferential direction,
The reinforcing fibers are more oriented in the circumferential direction.

■ Through the perforated iron plate (IA) constituting the substantial suppression part on the upper formwork (1) side and the filter (51) with a mesh size that does not allow cement particles to pass through, the FRC changes its shape by suction by a vacuum pump (not shown). All the water is removed by vacuum suction until it hardens to the point where it can be retained. (See Figure 8) ■ After dewatering is completed, the upper formwork (1) is removed from the mold, and the FRC is hardened and cured until it completely loses its fluidity. By letting
A semi-cylindrical fiber-reinforced cement product +A) as shown in FIG. 4 is obtained.

In addition, when FRC is supplied to the lower formwork and is uniformly supplied over the entire length of the lower formwork for molding, it is possible to strengthen the orientation of the FRC in the circumferential direction. If the fibers are concentrated in a part of the length direction of the lower mold and formed, the fibers can be distributed in the longitudinal direction as well, so you can freely adjust the way the FRC is fed to meet the requirements of the product. fiber orientation is obtained. In addition, the products to be manufactured by the present invention include products other than semicircular 111-shaped products, such as the 5th
As shown in the figure, the cross section is trapezoidal.

It may be of.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the method for manufacturing fiber-reinforced cylindrical cement products by the pressing method according to the present invention, and FIGS. frame,(
2)...Lower formwork, shaft)...Reinforcement throat 11
[,-...Cement mortar, 1A)...
··product. ) No. 4 @ No. 5a

Claims (1)

[Scope of Claims] ■ With a seven-piece mortar mixed with reinforcing material (m) supplied between the upper and lower pair of formworks 117, 12), the thickness of both formworks is tightened by (21) A method for producing a cylindrical fiber-reinforced cement product having a uniform taste or a uniform texture and a central portion protruding in one direction in the thickness direction, the method comprising mixing the fibers in an amount equivalent to the entire product. A method for manufacturing a fiber-reinforced cylindrical cement product by a pressing method, characterized in that the mold is clamped as described above while cement mortar is supplied to the bottom of the recess of the lower mold (21). rc41! Sensitivity repair by the press hoe according to claim 0 which imparts motion**
7th floor manufacturing of cement products. ■ A method for manufacturing a fiber-reinforced cylindrical cement product by a pressing method as set forth in claim 2 and claim 2, wherein the target product has a semi-cylindrical shape.