JPH0471683B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for manufacturing tiled concrete products. More specifically, the present invention relates to a method for manufacturing tiled concrete products using a centrifugal forming device. [Prior Art] Concrete products having a circular cross-section, such as humid pipes, have been manufactured using centrifugal forming equipment for a long time. It is also known to manufacture stair blocks using a centrifugal molding apparatus (Japanese Patent Application Laid-open No. 32710/1983). [Problems to be Solved by the Invention] Conventionally, no method has been proposed for producing tiled concrete products using a centrifugal forming apparatus. This is because a large centrifugal force acts during the manufacturing process using the centrifugal molding device, causing the tile to shift from the mold surface. If the tiles are arranged along the outer peripheral surface of the formwork of the centrifugal forming apparatus, a tiled concrete product can be manufactured using the centrifugal forming apparatus. However, in this case, the surface to be tiled is limited, and only tiled concrete products of a specific shape (for example, a columnar body whose outer peripheral surface is tiled) can be manufactured. [Means for Solving the Problems] The method for manufacturing a tiled concrete product according to claim 1 uses a tile unit in which a plurality of tiles are arranged and connected by a synthetic resin sheet, and the tiles of the tile unit are In a method for manufacturing a tiled concrete product, in which concrete is poured on the back side and a synthetic resin sheet is peeled off after the concrete has hardened, the tile unit is arranged in a formwork extending in a radial direction of a formwork of a centrifugal forming apparatus. It is characterized by being attached to a surface and allowing the concrete to be poured into the formwork using centrifugal force. In the method for manufacturing a tiled concrete product according to claim 2, in claim 1, the tiled concrete product is a stair block, and the tile unit is placed on the outer peripheral side of the formwork together with the formwork surface extending in the radial direction of the formwork. The structure is characterized in that the formwork is approximately L-shaped so that the tile surface forms the rising surface and the stepping surface of the stair block. The method for manufacturing a tiled concrete product according to claim 3 is characterized in that in claim 1 or 2, a portion of the manufactured tiled concrete product that was located on the center side of the centrifugal forming device is removed. It is something. [Function] In the method for manufacturing a tiled concrete product according to claim 1, the tiles are used as a tile unit connected by a synthetic resin sheet, so that a large centrifugal force is applied or the tiles come into contact with poured concrete. Even if you do, it won't shift.
Thus, tiled concrete products can be manufactured using centrifugal forming equipment. According to the method for manufacturing a tiled concrete product of claim 2, a stair block whose rising surface and tread surface are tiled can be manufactured using a centrifugal forming device. In the method for producing a tiled concrete product according to claim 3, a concrete product having a relatively high strength as a whole is produced, with relatively low-strength portions removed. That is, the closer the concrete is to the center of the centrifugal forming device, the greater the water-cement ratio and the lower the strength of the poured concrete. In claim 3, this low strength portion is removed, so
Overall, a concrete product with extremely high strength is produced. [Example] Hereinafter, an example will be described with reference to the drawings. FIG. 1 is a perspective view of the manufactured stair block 1. A rectangular plate-shaped tile 2 is placed on the stepping surface 1a of the stair block 1, and a rising surface 1b rises from the front edge.
An L-shaped accessory tile 3 is placed on the part that wraps around. 4 is concrete. FIG. 2 is a side sectional view of the tile unit 5 used in manufacturing the stair block of FIG. 1. The tiles 2 and 3 are connected by a synthetic resin sheet 6. Note that the sheet 6 is inserted into the joint between the tiles 2 and 3. This tile unit 5
As is well known, the sheet 6 is applied to the surfaces 2a and 3a of the tiles 2 and 3, and then vacuum suction is applied from the back side to bring them into close contact with each other. Reference numeral 7 in FIG. 2 indicates a double-sided adhesive tape for attaching the tile unit 5 to the surface of a formwork to be described later. Further, reference numeral 8 indicates a temporary joint filler filled in the joint gap. The temporary joint material 8 is inserted to prevent the joint gap from shrinking (becoming smaller) when centrifugal force is applied to the tile 2. FIG. 3 is a plan sectional view of the rotary drum of the centrifugal molding apparatus, and FIG. 4 is an enlarged sectional view of the mold portion. In this embodiment, there are 32 formworks 11 in the rotating body 10.
is installed. This formwork 11 includes a mold surface 12 for forming the stepping surface 1a of the stair block 1;
It includes a mold surface 13 for forming the rising surface 1b, a mold surface 14 for forming the back surface of the concrete 4, and the like. Reference numeral 15 indicates a reinforcing member, and 16 indicates a formwork 11.
A support member for fixing the inside of the rotary cylinder 10 is shown. Further, reference numeral 17 is an inlet for concrete (concrete that has not yet hardened) into the formwork 11. In the tile unit 5, the tile 2 has a mold surface 12.
along the corner of tile 3 is mold surface 12 and mold surface 1
It is pasted with double-sided adhesive tape 7 so as to be located at the intersection corner with 3. After the tile unit 5 is pasted, as shown in FIG. 5, the rotary drum 10 is rotated and concrete is poured and shaped. Thereafter, the mold 11 is taken out, steam-cured, and then demolded. Next, it is processed by polishing, shot blasting, etc. After that, cutting is performed, and after product inspection, the product is shipped. Note that the portion located on the inflow port 17 side may be cut out during the above cutting process. A specific manufacturing example will be described next. Using concrete with the composition shown in Table 1, 400
A stair block measuring 150 mm x 1000 mm and having the shape shown in Fig. 1 was manufactured. The rotation speed of the rotary drum 10 is as follows. When adding concrete: 40 rpm When dewatering: 80 to 100 rpm When compacting (approximately 30 minutes): 100 to 120 rpm Pre-curing was performed for approximately 2 hours after compaction was completed, and steam curing was performed for 1 hour at 40 to 60°C. Thereafter, natural curing was performed for a predetermined period of time. As a result, the concrete hardens densely with extremely high strength.
A stair block with a strong bond between concrete and tiles was manufactured.

[Table] [Effects of the Invention] As described above, according to the method for producing a tiled concrete product of claim 1, a tiled concrete product can be produced using a centrifugal forming device. The manufactured concrete products are concrete that has been centrifugally compacted, and the bond strength between the tiles and concrete is extremely high. Also, since the water-cement ratio of concrete is low and the concrete is finished densely, almost no efflorescence occurs. It also has excellent freeze-thaw resistance. According to claim 2, a stair block having the above-mentioned excellent properties is produced. According to claim 3, a concrete product having extremely high strength as a whole can be manufactured.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the stair block, Fig. 2 is a side sectional view of the tile unit, Fig. 3 is a plan sectional view of the rotary barrel of the centrifugal forming device, Fig. 4 is a sectional view of the formwork, and Fig. 5
The figure is a manufacturing process diagram. 1... Stair block, 2... Tile, 3... Accessory tile, 5... Tile unit, 10... Rotating body, 11...
Formwork.

Claims (1)

[Claims] 1. Using a tile unit in which a plurality of tiles are arranged and connected with a synthetic resin sheet, concrete is poured onto the back side of the tile of the tile unit, and after the concrete has hardened, the synthetic resin is poured into the tile unit. In a method for manufacturing a tiled concrete product in which a sheet is peeled off, the tile unit is attached to a formwork surface extending in a radial direction of a formwork of a centrifugal forming device, and concrete is poured into the formwork by centrifugal force. A method for manufacturing a tiled concrete product characterized by: 2 The tiled concrete product is a stair block, and the tile unit is attached to the formwork surface extending in the radial direction of the formwork as well as to the formwork surface on the outer peripheral side of the formwork, so that the tile surface is the rising surface of the stair block. 2. The method of manufacturing a tiled concrete product according to claim 1, wherein the formwork is formed into a substantially L-shape so as to form a tread surface. 3. The method for manufacturing a tiled concrete product according to claim 1 or 2, characterized in that, of the manufactured tiled concrete product, a portion located on the center side of the centrifugal forming device is removed.