JPS63288706A - Manufacture of fiber reinforced concrete product - Google Patents

Abstract

PURPOSE:To shorten production time and contrive to enhance production efficiency by a method wherein a cement-based compact is formed by dewatering reinforcing fiber-containing stock slurry, which is charged and filled in a forming space, by suction under vacuum and, after that, hardened. CONSTITUTION:Under the state that forces are closed, stock slurry 10, which contains reinforcing fibers such as glass fibers or the like, is forced in from a forcing inlet 9. At the same time, the moisture in the stock slurry is discharged outside by suction under vacuum through vacuum suction pipes 3 and 8. At the stage that a cement-based compact has become to have enough strength, compressed air is delivered from the vacuum suction pipe 8 in the bottom force main body 7 and at the same time the top forces 1 and 2 are raised relative to the bottom forces 6 and 7 under the condition that the suction is kept on applying to the top forces 1 and 2 through the vacuum suction pipe 3. A receiving tray is inserted under the state just mentioned above between the top forces 1 and 2 and the bottom forces 6 and 7 and, after that, the suction under vacuum applied on the top forces 1 and 2 is cut off. As a result, the cement-based compact 16 can be easily released from the top forces 1 and 2 without being applied so excessive pressure as to develop strain.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a method for producing fiber reinforced concrete products.

(Prior Art) In general, fiber-reinforced concrete products such as glass fiber-reinforced concrete products are manufactured by surrounding the outer periphery of a mat material 12 with an uneven surface pattern with a formwork 11, as shown in FIG. It is manufactured by letting concrete 13 containing glass fiber flow down from a hopper 14, casting it into a mold, and curing it naturally in that state.In this case, a mold mat with an uneven pattern on the surface is formed from the opening at the lower end of the hopper 14. Material 1
The distance to the surface of No. 2 is set at 1 to 1.5 m. In this way, glass fiber reinforced concrete products (rG
When manufacturing RC products (abbreviated as "RC products"), curing and hardening,
Since it usually takes a long time of 4 to 48 hours, there is a drawback that productivity is extremely low.

[Problem that the invention seeks to solve]

As a manufacturing method different from the above manufacturing method, as shown in FIG. 4, a metal mold 15 having a molding recess (having an uneven pattern formed on the bottom surface) inside is prepared. Then, glass fiber-containing concrete 13 in the form of slurry is sprayed into the molding recess of this metal mold 15, and then the spraying process is carried out using a roller to pressurize the body to a uniform thickness, and then the metal mold 15 is Place in an autoclave etc. and steam cure (40℃)
There is also a method of manufacturing GRC products by carrying out a process for about 6 hours.

This method also requires a long curing time, and requires the effort of pressurizing the body with a roller to spray the material into the molding recess.

The present invention was made in view of the above circumstances, and an object thereof is to shorten manufacturing time and improve manufacturing efficiency.

[Means for solving problems]

In order to achieve the above object, the method for producing a fiber reinforced concrete product of the present invention includes an upper mold body and a lower mold body having water permeability, and a vacuum suction passage arranged in each of the above mold bodies. A mold and a lower mold are prepared, a raw material slurry containing reinforcing fiber is supplied into the molding space created by the two molds, and the reinforcing fiber-containing slurry is supplied and filled into the molding space of the two molds using the vacuum suction path. The raw material slurry is dehydrated by vacuum suction to create a cement-based molded body, which is then demolded and cured to harden.

That is, the present invention does not pour or spray concrete as in the past, but casts it and creates a cement-based molded body by vacuum suction dehydration, making it easy to mold and easy to demold the cement-based molded body. The strength required for this can be quickly achieved by the vacuum suction dehydration described above. Therefore, it is now possible to cast the raw material into the mold and remove the molded object from the mold in a short time, and then cure and harden the molded object as it is, shortening the manufacturing time and reducing the number of molds. It will be possible to realize the That is,
In the conventional example, the material is not cast and is not subjected to vacuum suction dehydration as described above, but is left in the mold to cure and harden, resulting in a long manufacturing time and the need for a large number of molds. Further, in the above method, since a cement-based molded body is produced by vacuum suction dehydration, a raw material slurry having a high moisture content and in a so-called shabu-shabu state can be used. Therefore, even when a mold having an uneven shape is used to form a complicated uneven pattern, the uneven shape of the mold can be maintained. In other words, when using a high viscosity raw slurry, high pressure is required for casting, but if a low viscosity raw slurry can be used as described above, the pressure during casting can be small and the unevenness of the mold can be reduced. No damage to the shape.

Next, the present invention will be explained in detail based on examples.

〔Example〕

FIG. 1 shows a molding apparatus used in this invention. In the figure, 1.2 is an upper mold, which includes a frame 1 having a U-shaped cross section and a porous elastic body (upper mold main body) made of resin with continuous pores disposed inside the frame 1. ing. The continuous pores of this porous elastic body 2 with continuous pores are set to have a pore diameter (usually about 10 μm) that allows only moisture to pass through and prevents solid content such as cement from passing through. A vacuum suction pipe 3 extends within the porous elastic body 2 with continuous pores in a direction perpendicular to the plane of the paper. The vacuum suction pipe 3 includes a branch pipe 5 having a plurality of openings 4 at predetermined intervals in the axial direction. The end of the vacuum suction pipe 3 is connected to a vacuum suction pump (not shown) via a connecting pipe (not shown), and a cutoff valve is provided in the middle of this connecting pipe. 6.7 is a lower mold, which includes a frame 6 having a U-shaped cross section, and a porous elastic body (lower mold main body) 7 made of resin and having continuous pores disposed inside the frame 6. The pore diameter of this material is the same as that of the upper mold body 2 described above. A vacuum suction pipe 8 having the same structure as that provided in the upper mold body 2 is provided in the lower mold body 7. This vacuum suction pipe 8 is connected to a vacuum pump (not shown) and a compressed air delivery pump (not shown) via a switching valve provided in a connecting pipe (not shown). And the above upper mold 1
．． 2 and the lower molds 6 and 7 are moved up and down to open the molds by a conventionally known mold opening/closing device (not shown). Moreover, an uneven pattern is formed on the surface of the lower mold main body 7 of the lower mold. Furthermore, on the side of the upper mold frame 1,
A press inlet 9 is formed for press-fitting the raw material slurry 10 into the molding space created by the upper mold body 2 and the lower mold body 7.

In this configuration, with the mold closed as shown in FIG. 1, a raw material slurry 10 containing reinforcing fibers such as glass fibers is press-injected (10 to 30 kg/c+II) from the injection port 9. This raw material slurry 10 is a low viscosity material (slump value of 5 or more) with a considerably high water content, and is easily filled into the molding space created by the upper mold body 2 and the lower mold body 7 by the above-mentioned engineering pressure. At the same time, vacuum suction is performed from the vacuum suction pipe 3 of the upper mold and the vacuum suction pipe 8 of the lower mold, and moisture is discharged to the outside through the continuous pores of the upper mold main body 2 and the lower mold main body 7. This operation is continued until the molding space is filled with the cement-based molded body. In this case, the moisture in the raw material slurry 10 is quickly suctioned and removed by vacuum suction by the rain gear empty suction pipe 3.8, so that the produced cement-based molded body quickly gains strength. Next, when the cement-based molded product has sufficient strength, compressed air is discharged from the vacuum suction pipe 8 of the lower mold body 7 (0°5 kg).
At the same time, the upper molds 1 and 2 are raised relative to the lower mold 6° 7 while continuing suction with the vacuum suction pipe 3 (see FIG. 2).

As a result, the produced cement-based molded body 16 is transferred to the upper mold body 2.
It rises while being adsorbed to the surface of. In this state, the receiver inserts a plate (not shown) between the upper molds 1, 2 and the lower molds 6, 7 to cut off the vacuum suction of the upper molds 1.2. As a result, the cement-based molded body 16 is detached from the surface of the upper mold body 2, and the receiver falls onto the pan. Thereby, the cement-based molded body 16 can be easily detached without applying excessive pressure to the cement-based molded body 16 and causing distortion. Then, the receiver containing the cement-based molded body 16 in this manner is put into a curing device such as an autoclave device in a state where a plurality of plates are grouped together and cured.

In this way, fiber reinforced concrete products can be manufactured efficiently and in a short time.

In the above examples, glass fibers are used as reinforcing fibers in the raw material slurry, but the reinforcing fibers are not limited to this, and inorganic fibers such as carbon fibers and metal fibers may be used alone or in combination. be able to. In the above embodiment, the upper mold body 2 and the lower mold body 7 are made of porous elastic material with continuous pores made of resin, but instead of this, organic fibers, metal fibers, inorganic fibers such as glass fibers, etc. may be molded to fit into the mold 1.6 and used as it is as the porous elastic body with continuous pores,
The same effect as described above can be obtained by forming a porous elastic thin film layer made of resin with continuous pores on the surface (the surface in contact with the raw material slurry). Furthermore, the upper molds 1 and 2 and the lower molds 6 and 7
The upper mold body 2 and the lower mold body 7 are housed in a frame 1.6, but the outer peripheries of the upper mold body 2 and the lower mold body 7 are hardened with resin etc. to make them airtight. There is no harm in using it.

〔Effect of the invention〕

As described above, the present invention performs casting and uses special vacuum suction passages in the upper and lower molds to suction and remove moisture from the raw material slurry supplied into the molding space. Therefore, it is possible to shorten the molding time, and at the same time, it is possible to form a cement-based molded body with a complicated shape using a raw material slurry of relatively low viscosity without damaging the mold by applying excessive pressure. Furthermore, since water is removed by suction from both the upper mold and the lower mold, the water can be removed quickly and at the same time a product with uniform material can be obtained. Furthermore, since the cement-based molded body is manufactured by vacuum suction and dehydration of moisture, no flaking or the like occurs during its manufacture. Moreover,
According to the method of the present invention, the sound is quieter than the vibratory compaction method for general concrete and does not cause deterioration of the working environment.

Next, a specific example will be explained in detail.

〔Concrete example〕

First, a molding apparatus as shown in FIG. 1 was prepared as a molding apparatus. Next, add 110 parts by weight of ordinary Portland cement (hereinafter abbreviated as "parts") and ±20 parts of diatomaceous powder to water.
The mixture was mixed at a cement ratio of 0.5, and 3 parts of a cationic acrylic emulsion and 0.3 parts of a water reducing agent were added at the same time. A cement slurry is made by mixing and stirring this metal distribution material, and using this slurry and alkali-resistant glass fiber (fiber length 26 cm),
Raw material slurry IJ-10 was supplied into the molding space at a pressure of about 30 kg/ctll. In this case, the glass fiber content was set at about 5% by weight. Simultaneously with this press-fitting, the moisture in the slurry 10 was removed in about 15 minutes by vacuum suction from the vacuum suction pipes 3 and 8 of the upper and lower molds, thereby producing a cement-based molded body.

Next, remove 0.5 kg from the vacuum suction vibrator 8 of the lower mold.
At the same time as blowing out compressed air of approximately csa, the upper mold 1.2 is raised by a hydraulic cylinder mechanism. At this time, the vacuum suction of the suction pipe 3 of the upper die is continued. As a result, the produced cement-based molded body 16 is formed by the upper mold 1,
It rises while attached to 2.

Next, a tray is inserted between the upper molds 1, 2 and the lower mold 7.6 to block the vacuum suction of the upper molds 1, 2.

As a result, the cement-based molded body 16 falls onto the tray. Next, this was placed in a normal autoclave and cured to obtain a fiber-reinforced concrete plate with an uneven pattern formed on its surface. This fiber reinforced concrete board is
The chair is warped due to distortion, and the lower mold body 7
The uneven pattern formed on the surface was faithfully transferred and was extremely beautiful.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a molding apparatus used in the present invention, FIG. 2 is an explanatory view of its operation, and FIGS. 3 and 4 are explanatory views of a conventional example. 1.6... Frame body 2... Upper mold body 3.8... Vacuum suction vibrator 4... Opening 5... Branch pipe 7
... Lower mold body 9 ... Pressure inlet 10 ... Raw material slurry 16 ... Cement-based molded body Fig. 1 Fig. 2 Fig. 3 Fig. 04

Claims (1)

[Claims] (1) Prepare an upper mold and a lower mold each having a water-permeable upper mold main body and a lower mold main body, and a vacuum suction passage arranged in each of the above-mentioned mold bodies, and use the molding made by the above-mentioned both molds. A raw material slurry containing reinforcing fibers is supplied into the space, and the raw material slurry containing reinforcing fibers supplied and filled into the molding spaces of both types is vacuum-suction dehydrated using the vacuum suction path to create a cement-based molded body. A method for manufacturing fiber-reinforced concrete products, which is characterized by demolding and curing and hardening.