JPS5937205B2 - Vibratory pressurized cement product manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method that is mainly employed when manufacturing cement products that are thin and lightweight yet have excellent mechanical strength using cement mortar mixed with glass fibers. Excess water in the cement mortar is removed by pressurizing the cement mortar while applying vibration to the cement mortar supplied in the formwork, which has a pressure-resistant structure and has a filter for removing excess water on at least one of its inner surfaces. The present invention relates to a method for manufacturing a cement product, which involves dehydrating water through the filter, demolding it, and curing it.

The above method uses vibration to promote defoaming and fluidization of unhardened cement mortar, thereby omitting or simplifying manual labor in order to improve product finish accuracy such as defoaming, thickness, and shape. In addition to increasing the strength of the product by dehydrating excess water through a filter,
Although it is possible to improve manufacturing efficiency by shortening the hardening time required before demolding, the excess water in the cement mortar cannot be sufficiently removed, and if the cement mortar is demolded in an unhardened state, the cement mortar surface becomes very rough.

Particularly in the case of products with rising parts around the periphery, forced dehydration using vacuum pressure is used to maintain the shape of the rising parts stably even after demolding. In particular, the filter is removed from the mold while being held tightly against the cement mortar surface, and as a result, the surface mortar adheres to the filter and is peeled off, resulting in a very poor surface condition of the product. In order to reuse it, there was a drawback that it required a great deal of effort, such as washing off the mortar adhering to it and pickling to remove clogging.

In view of the above circumstances, the present invention aims at facilitating demolding and improving the product surface condition by making simple improvements to the conventional vibration pressurizing manufacturing method, and also improves ease of filter maintenance and durability. The purpose is to help people improve their sexuality.

The vibration pressurized cement product manufacturing method according to the present invention includes:
In the method described above, a mold release material having filtration performance and excellent flexibility and bendability is interposed between the filter and the cement mortar facing it, and vibration pressurized dehydration is performed. Characterized by doing.

In other words, when performing vibration pressurized dewatering, by interposing essentially a double filter between the cement mortar and the inner surface of the formwork, consisting of a filter and a mold release material that has high permeability, the original filter function is not impaired. After pressurized dehydration, peeling between the two facilitates demolding, and the mold release material that remains attached to the cement mortar surface is highly flexible and flexible. For example, by using means such as rolling it up from one end side, it is possible to prevent cement mortar from adhering to the release material,
The mold release agent can be removed while maintaining the surface condition of the cement mortar surface in good condition, thereby making it possible to significantly improve the surface condition of the product compared to the conventional case.

Moreover, since the original filter does not come into direct contact with the cement mortar surface, there is almost no dirt or clogging, so the hassle of washing with water and pickling when reusing the filter can be omitted or significantly reduced. Moreover, the life of the filter itself can be extended, and it is economically advantageous as a whole, regardless of the additional use of a mold release material.

Examples of the method of the present invention will be listed below in order of steps based on the drawings.

■ As shown in Fig. 1, a U-shaped lower mold frame 1A with an upward opening in vertical section is elastically supported by a fixed part 5 via a spring 6 with a vibration motor 4 attached to its bottom wall. and a trapezoidal perforated steel plate 1b that can be fitted into the lower formwork 1A, and a flat iron plate that can be fitted into the lower formwork 1A with its peripheral edge in close contact with the inner peripheral surface of the lower formwork 1A. A formwork 1 having a pressure-resistant structure is constructed with an upper formwork 1B having an upper wall plate 1b', and a cement mortar C containing reinforcing fibers such as glass fiber is poured into the lower formwork 1A.

■ Next, as shown in Fig. 2, as an example of a mold release material that has filtration performance and excellent flexibility and bendability, a mold release material of 10 to 300.9/m2 is placed on the cement mortar C. , preferably in the weight range of 30 to 50 g/day, has no additives, has a long pulp, and has high tear resistance in a wet state due to calendering on at least one side, and
The calendered surface of the smooth Senko paper 3 and a filter 2 made of felt, canvas, or wire mesh with 10 or more meshes, preferably 60 meshes or more are placed in such a way that the Senko paper 3 side is in contact with the cement mortar C. At the same time, place these paper 3 and filter 2 in an overlapping position.
The above-mentioned upper formwork 1B is set on top.

■ In this set state, the vibration motor 4 is
000-30.000 rpmv preferably 3.00
While operating at 0 rpm and applying vibration in the range of 0.01 to 3.5 mm to the cement mortar C through the formwork 1, the upper formwork 1B is subjected to vibrations of 0.01 to 3.5 mm through a hydraulic press or the like.
While applying a pressure of ~1 kg/cril, the upper formwork 1
By applying forced water suction force through the hole 1b formed in the flat upper wall plate 1b' of B via a vacuum pump (not shown),
Excess water in the cement mortar C is forcibly discharged to the outside of the formwork 1 through the sacrificial paper 3, the filter 2, and the perforated iron plate 1b, thereby forming a product with a predetermined shape having rising portions around the periphery.

(2) Afterwards, as the cement mortar C leaves the upper formwork 1B in an unhardened state, the paper 3 remains attached to the surface of the cement mortar C, as shown in FIG. The mold is removed in a state where the paper 3 and the filter 2 are separated.

- After demolding, peel off the paper 3 from one end to leave the cement mortar C, which has maintained its surface condition, in the lower formwork 1A, and hold it for an appropriate period of time. By curing and hardening, a product with a predetermined shape can be obtained.

The release material 3 may be, in addition to the above-mentioned Sengoku paper, for example, a fusuma lining paper or recycled waste paper without additives. ,
By dipping it in a 0.1% aqueous solution of niketogluconic acid and sugars to delay hardening, it can be peeled off even after the cement mortar has completely hardened, making it possible to further improve the surface condition.

Moreover, as a pressurizing means, instead of using the press shown in the above embodiment, as shown in FIG. After the upper formwork 1B is clamped to the lower formwork 1A via the screw members 9, compressed air is supplied into the formwork 1, and cement mortar is spread through the elastic membrane 8. C
It is also good to pressurize.

In this case, the upper formwork 1 corresponds to the area around the upper end of the filter 2.
Excess water is dehydrated through the hole 1b' formed at position B by the forced suction power of a vacuum pump.

Furthermore, it goes without saying that the mold release material 3 and the filter 2 may be polymerized and interposed on the bottom surface of the lower frame 1A in the same manner as described above, and forced dewatering from the bottom of the lower frame 1A may be carried out.

[Brief explanation of the drawing]

The drawings show an embodiment of the vibration pressurization type cement product manufacturing method according to the present invention, and FIGS. 1 to 3 are longitudinal cross-sectional views explaining each process, and FIG. 4 is a longitudinal cross-sectional view of another embodiment. It is. 1...Formwork, 2...Filter, 3.
...Mold release agent, C...Cement mortar.

Claims (1)

[Claims] 1. While applying vibration to the cement mortar C supplied in a formwork 1 having a pressure-resistant structure and having a filter 2 for dehydrating excess water on at least one of its inner surfaces, the cement mortar C is In a method for manufacturing a cement product, the excess water in the cement mortar C is dehydrated by applying pressure through the filter 2, and then demolded and cured.
The filter 2 and the cement mortar C facing it
Manufacturing of a vibratory pressurized cement product characterized by interposing a mold release material 3 which has filtration performance and excellent flexibility and bendability between it and performs vibratory pressurized dehydration. Method. 2. The method for manufacturing a vibratory pressurized cement product according to claim 1, wherein the cement mortar C is cement mortar containing reinforcing fibers. 3. The vibrating pressurized cement product according to claim 1 or 2, wherein the mold release material 3 is a sheet-like material that has been calendered at least on the side that contacts the cement mortar C. Production method. 4. Manufacturing of the vibrating pressurized cement product according to claim 1 or 2, wherein the mold release material 3 is subjected to hardening retardation treatment on at least the surface thereof that contacts the cement mortar C. Method. 5. The method for manufacturing a vibratory pressurized cement product according to any one of claims 1 to 4, wherein the mold release material 3 is made from a paper material.