JPH0620733B2 - Method and apparatus for centrifugal molding of PC panel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a centrifugal molding method for a PC panel and an apparatus therefor capable of mass-producing high-strength PC panels by the centrifugal molding method.

(Conventional technology and its problems) Conventionally, concrete panels used for sheet piles, etc., are steam-cured by consolidating concrete with a vibrator, and after that,
A mechanical pressure curing method that is manufactured by demolding and performing wet curing, a vacuum concrete method that uses atmospheric pressure instead of a vibrator to remove excess water, and a vacuum pump It is the current state of being manufactured by various construction methods such as the one using a pressure vacuum construction method that removes moisture by using a special mat and the air pressure of a special mat.

However, since concrete is poured into the mold and it is hardened, not only partial unevenness occurs but also the compressive strength is limited, which is unsatisfactory in terms of weight reduction of buildings. there were. Further, since the production method is one by one, there is a problem that the production efficiency is poor.

(Object of the Invention) The present invention has been made in view of the drawbacks of the conventional example, and an object thereof is to manufacture a large number of PC panels excellent in compressive strength by utilizing centrifugal molding. Another object of the present invention is to provide a centrifugal molding method and apparatus therefor.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a centrifugal molding apparatus for a PC panel of the present invention comprises a plurality of cylindrical centrifugal molding solids (1) having a plurality of axially parallel inner peripheral surfaces. A partition wall (2) is provided upright, and at least the partition wall has an outer wall surface portion having an arcuate cross section in contact with the inner peripheral surface, and two partitioning flat surface portions which are connected to both sides of the outer wall surface portion to form a partition surface. And a molding body which is arranged opposite to the outer wall surface portion and has an inner wall surface portion having an arcuate cross-section having a slightly convex curvature toward the molding die center portion, and the molding die from the outer wall surface portion to the hollow body. The central rim (2a) is projected toward the center of rotation of the
A screw hole (2b) for screwing the temporary fixing bolt (7) is screwed into a) to form a flat surface portion (3) having a flat surface between the partition walls (2).

The technical means of ";" is adopted, and the PC of claim (2)
The method of centrifugal molding of a panel is as follows: After the concrete (4) is poured into the cylindrical centrifugal molding die (1) according to claim (1), the centrifugal molding die (1) is rotated to flatten the poured concrete (4). The PC panel (5) is formed along the inner circumference of the part (3) and is divided and molded by the partition wall (2).

The technical means called; is adopted.

(Working) After pouring a predetermined amount of concrete (4) into the cylindrical centrifugal mold (1), rotate the centrifugal mold (1) to perform centrifugal compaction, and then perform curing and demolding. Then PC panel (5)
To form.

The thus-shaped PC panel (5) is excellent in compressive strength because it is sufficiently centrifugally compacted by centrifugal molding, and a plurality of PC panels (5 can be formed by one centrifugal molding. ) Is molded, which is suitable for mass production.

(Examples) Hereinafter, the present invention will be described in detail with reference to illustrated examples. FIG. 1 is a sectional view of a centrifugal mold (1) for dividing into two used in the present invention. The centrifugal mold (1) has a cylindrical shape and can be halved from the center. Connection and assembly can be done with the tightening bolts (16) screwed to (15). A plurality of partition walls (2) are erected on the inner peripheral surface (6) of the centrifugal molding die (1) in parallel with the axial direction. The partition wall (2) is a hollow lens and is arranged over the entire length of the centrifugal molding die (1), and a temporary fixing bolt (7) is provided in a bolt hole (2b) formed in the central rib (2a). It is screwed on.

Between the partition walls (2), a three-sided flat part (3) is arranged along the two folding curves (9). This plane part (3) has a panel form part (3a) having two faces and a half face, and a half face inner wall frame part (3b).
It consists of a panel mold part (3a) and an inner mold part (3b).
End surfaces of the centrifugal mold are joined to each other to form one surface.
It is aligned with the mounting rib (15) for halving in (1).

Then, a certain amount of concrete (4) is put in this centrifugal molding die (1) (that is, when the centrifugal molding is performed, the concrete (4) is a partition wall.
Inject only the amount that does not exceed (2) and cover the inlet (not shown).
After that, rotate it to perform centrifugal compaction, and then perform curing, remove the tightening bolt (16) and break the centrifugal mold (1) to remove the flat mold (3 ) Along the shape
(The outer surface has three convex surfaces and the inner peripheral surface has a concave shape). In this case, the reinforcing bar (10) may be arranged in the centrifugal molding die (1) and the reinforcing bar (10) may be embedded in the PC panel (5) during centrifugal molding.

FIG. 2 shows an example of use of the PC panel (5) formed by the above method, in which a plurality of upright PC panels (5) are attached to a structural beam.
This is an example in which a wall is formed by attaching to a horizontal attaching member (12) arranged along (11).

FIG. 3 shows an example in which the centrifugal molding die (1) is divided into four parts. A partition wall (2) having a cross-sectional shape is screwed to the inner peripheral surface (6), and a flat surface portion (3) is provided between them. Are arranged on four sides. The PC panel (5) molded by this centrifugal molding die (1) is formed into a concave lens shape in cross section. Reference numeral (10) is a reinforcing bar protruding from the concave surface portion (13).

FIG. 4 shows an example in which a PC panel (5) formed by the four-division centrifugal molding method is laid on a foundation beam (11) and a wall surface to form a bottom plate of a concrete floor (14) cast on site. In this case, the reinforcing bar (10) protruding in the concave surface of the PC panel (5) is the concrete floor.
It is embedded in (14) and both are integrated.

The compression strength of the PC panel (5) manufactured by the centrifugal molding method as described above is much higher than that of the conventional panel manufacturing method. Further, although the present embodiment shows the case of two divisions and four divisions, the example of division is not limited to this, and the three-sided shape is used in the case of two divisions, but is not limited to this. An appropriate shape can be adopted.

(Effect of the present invention) In the centrifugal molding apparatus for a PC panel of the present invention, a plurality of partition walls are erected on the inner peripheral surface of a cylindrical centrifugal molding die in parallel with the axial direction,
The partition walls are formed in a flat shape, and the manufacturing method thereof is a cylindrical shape in which a plurality of partition walls are erected on the inner peripheral surface in parallel with the axial direction and the partition walls are formed in a flat shape. After the concrete is poured into the centrifugal molding die, the centrifugal molding die is rotated so that the poured concrete is put on the inner peripheral plane, and the partition wall forms the PC panel by split molding. Therefore, there is an advantage that a plurality of PC panels can be manufactured at one time by a centrifugal molding apparatus that is originally used for manufacturing a column, and a high-strength PC panel can be mass-produced.

[Brief description of drawings]

1 ... Cross-sectional view of one embodiment of the present invention FIG. 2 ... Perspective view of construction example using PC panel produced by centrifugal molding die of FIG. 1 FIG. 3 ... Cross-section of another embodiment of the present invention Fig. 4 ... Perspective view of construction example using PC panel produced by centrifugal mold of Fig. 3 (1) …… Centrifugal mold, (2) …… Partition wall (2a) …… Rib, (2b ) …… Bolt hole (3) …… Flat part, (3a) …… Panel form part (3b) …… Inner form part, (4) …… Concrete (5) …… PC panel, (6)… … Inner inner surface (7) …… Temporary fixing bolt (9) …… Bending curve, (10) …… Reinforcing bar (11) …… Beam, (12) …… Horizontal mounting member (13) …… Concave surface, (14) …… Concrete floor (15) …… Mounting ribs, (16) …… Tightening bolts

Claims (2)

[Claims] 1. A centrifugal molding apparatus for a PC panel, wherein a plurality of partition walls dividing an inner peripheral surface of the cylindrical centrifugal molding die in the circumferential direction are interposed in parallel with the axial direction of the molding die. The partition wall is disposed at least opposite to the outer wall surface portion, which has an arcuate cross-section in contact with the inner peripheral surface, two partitioning flat surface portions which are connected to both sides of the outer wall surface portion to form a partition surface. And a hollow body composed of an inner wall surface portion having an arcuate cross-section having a slightly convex curvature toward the center portion of the molding die, and a center projecting from the outer wall surface portion toward the center of rotation of the molding die in the hollow body. It has a rim, and a screw hole for screwing a temporary fixing bolt for fixing the partition wall to the inner peripheral surface is screwed in the central rim, and the partition wall is formed into a flat portion between the partition walls. Centrifugal molding equipment for PC panels. 2. After injecting concrete into the cylindrical centrifugal molding die of the centrifugal molding apparatus according to claim 1, the centrifugal molding die is rotated so that the poured concrete is added to the inner circumference of the flat surface portion, and at the partition wall. A method for centrifugally molding a PC panel, characterized by forming the PC panel by split molding.