JPS5910290B2 - Manufacturing method of precast concrete board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a precast concrete board for residential use (hereinafter referred to as "PC concrete board").

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Fired decorative tiles, stone, etc. have been used for the exterior of building construction works for a long time, and carvings and the like have been applied on-site, but recently, due to advances in construction methods, PC concrete plates are being used more frequently.

The latter is also used on the surface of a prestressed concrete board with a mortar design surface formed by blowbrushing, but compared to the former, where stone is installed, on-site carving must rely on skilled craftsmen and plasterers. , is extremely superior, but its design is still inferior to yours, and it has the drawback of causing a Japanese-Chinese phenomenon.

That is, conventional PC concrete plates are manufactured by applying a demolding agent to a metal mold and pouring fresh concrete into the mold.

This means that water leaks through the gaps in the prefabricated formwork, which allows water to diffuse and escape from the surface of the solidifying concrete slab, resulting in numerous pinholes or holes on the surface of the finished PC concrete slab. This leaves a bore and causes efflorescence later.

Furthermore, the demolding agent applied to the mold also has an undesirable effect on the surface of the concrete plate.

On the other hand, the present inventor has proposed that natural rubber, synthetic rubber,
The use of molds made of elastomers such as silicone rubber and urethane prevents moisture from escaping. We are developing a manufacturing method for designed concrete plates that can be patterned with desired negative patterns.

The present invention provides a method for manufacturing precast concrete plates more easily using such an elastomer liner (mold).

Next, embodiments of the present invention will be described with reference to the drawings.

In Figure 1, 1 is plywood with a flat surface, 2 is a side frame constructed in a conical shape with each member on each four sides inclined inward so that the bottom opening is wider than the top opening, and 3 is a side frame with an outer diameter. An upright wall 3a is formed on the peripheral edge so as to have a dish shape slightly larger than the inner diameter of the side frame 2, and is made of rubber. This is a non-breathable inner lining material made of soft elastic elastomer such as.

A side frame 2 is arranged on the base plate 1, and the inner liner 3 is placed inside the side frame 2.
is laid with its lower surface in close contact with the surface of the plywood 10.

Then, concrete 4 is placed on the inner liner 3 inside the side frame 2 (Fig. 2).

Incidentally, if necessary, a ceramicizing agent (trade name: Relicoat 10) is applied to the inner surface of the inner liner 3 in advance.

In addition, as concrete 4, the present inventor had already developed it in Showa 5.
As stated in the patent application dated February 24, 2006, 500 l/m3 of fine aggregate with a grain size of volcanic ash from Kagoshima of 5 mm or less, 360 kg/m3 of ordinary Voltland cement, 60 mesh fine aggregate, a waterproofing agent, 5% of early demolding agent (product name: Relikoat 11) and plasticizing agent (product name: Relikoat 12)
) is added in 3 parts (all parts are by weight), put into a mixer, mixed and stirred, and then plasticizer (trade name: Relicoat A') is added at 20 cc per 1 k9 of cement (adjust according to the shape and material of the lapilli). do.

) Add 40 grams of water and mix well to make a sticky paste mortar, while adding 3,000 liters of volcanic lapilli from Oshima, Tokyo.
5, L 10t 13, 15, 20, 25mm
If the paste-like mortar is applied to the volcanic lapilli of each particle size, and the large number of bubble pores on the surface of the volcanic lapilli are closed, and the resulting material is used as coarse aggregate, The coarse aggregates interlock alternately, and the small coarse aggregates fill in the gaps between the large coarse aggregates, so the amount of voids is minimized, eliminating the need for large amounts of cement to fill the voids, and making it lightweight. This allows you to obtain uniform, high-density reinforced concrete plates that maintain their insulation properties and are free from dispersion.

After the concrete 4 is naturally cured and hardened without using steam, drying equipment, etc., if the side frame 2 is pulled upward, the side frame becomes a dog with a lower end opening surface than an upper end opening surface. Since it has a conical shape, it can be easily pulled out, and by subsequently peeling off the inner liner 3, the desired precast concrete plate is manufactured.

An uneven pattern such as a relief pattern is suitably expressed on the inner surface of the inner liner 3, mortar is applied to this pattern, and then concrete 4 is poured, thereby producing a decorative concrete board by transferring the pattern.

Further, if the concrete 4 is placed and then appropriately stacked and allowed to naturally cure, the stacking will suppress early evaporation of moisture and will not be a hindrance in terms of space, so stacking is also effective in that respect.

The one shown in FIG. 3 has side frame members 6a and 7a on two sides fixed in a perpendicular manner on a flat base plate 5, and side frame members 6b and 7b facing the side frame members on the two sides, respectively. is detachably fixed on the base plate 5.

As the fixing means, in addition to penetrating the base plate 5 and the side frame members 6b, 7b with fixing pins, a known clamp can also be used.

Inside the side frame constructed in this way, an elastomer inner liner whose outer diameter is slightly thicker than the inner diameter of the side frame is laid, as in the case of Figures 1 and 2. Place concrete on top of the material.

After natural curing and hardening of the concrete, the side frame members 6b, 7b are removed and the inner lining material is peeled off to produce a precast concrete plate.

As explained in the embodiments above, the method for manufacturing a precast concrete plate according to the present invention is to hold the upstanding wall at the peripheral edge of the soft elastic inner liner made of elastomer by the sidewall from the vCIA side during concrete pouring, In addition to preventing the shape from collapsing due to the pressure of concrete,
Since the side frame can be easily removed when the concrete hardens, even if the inner liner material is thin and soft, its shape can be maintained and the desired precast concrete plate can be manufactured.

In addition, because the inner lining material hardens and cures in close contact with the mortar surface, no moisture escapes from the surface, so no capillary action occurs, creating a glossy smooth surface like marble with no pores or a ceramic-like surface. It has various features such as a smooth surface that does not cause efflorescence later on.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a perspective view of the side frame, etc., Fig. 2 is a longitudinal cross-sectional view of the concrete at the time of pouring concrete, and Fig. 3 is an exploded perspective view of the side frame. . 1... Base plate, 2... Side frame, 3...
・・・Inner material, 4... Concrete, 5...
... Base plate, 6a, 6b, 7a, 7b...Side frame member.

Claims (1)

[Scope of Claims] 1. A side frame framed in a conical shape with a lower end opening wider than an upper end opening is arranged on a flat plywood board, and the outer diameter is slightly thicker than the inner diameter of the shell side frame, and the peripheral edge A non-breathable inner liner made of a soft elastic elastomer and having a dish-shaped upright wall is laid in the side frame with its lower surface in close contact with the surface of the base plate, and the inner liner in the side frame is A method for manufacturing a precast concrete board, which comprises: pouring concrete on top, and after the concrete is naturally cured and hardened, the side frame is pulled upward and removed from the mold. 2 Side frame members on two sides are fixed on a flat plywood board in a perpendicular manner, and side frame members facing each of the two sides are removably fixed on the plywood board, so that the inside of the framed side frame A non-porous inner liner made of soft elastic elastomer with an outer diameter slightly larger than the inner diameter of the sidewall and a plate-shaped upright wall formed on the periphery is laid, and concrete is placed on top of this inner liner. A method for manufacturing a precast concrete plate, which comprises: placing a concrete plate, and, after natural curing and hardening of the concrete, removing the removable side frame members and removing the mold. 3. Designed pre-V cast concrete according to claim 1 or 2, characterized in that an uneven pattern is provided on the surface of the inner lining material, mortar is applied to this, and then concrete is poured. Method of manufacturing the board. 4. A method for manufacturing a precast concrete board according to claim 1, 2, or 3, which comprises placing the concrete and then stacking the concrete as appropriate to allow natural curing.