JPH0767688B2 - PC concrete panel - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to high strength PC concrete panels mass produced by centrifugal molding.

[0002]

2. Description of the Related Art Conventionally, a concrete panel used for sheet piles is a mechanical pressure curing method which is manufactured by crushing concrete with a vibrator and steam-curing it, and then demolding and performing wet curing. Or by a vacuum concrete method that uses atmospheric pressure instead of a vibrator to remove excess water with a vacuum mat and a pump, or by a pressurized vacuum method that uses a vacuum pump to remove water and the air pressure of a special mat. At present, they are manufactured by various construction methods, and the concrete panels manufactured by these methods are simply plate-shaped.

When using these concrete panels to form a concrete floor, concrete panels are erected between beams and walls, horizontal streaks are arranged and fixed on the concrete panels, and then top concrete is poured into the concrete. It is common to build a concrete floor by embedding reinforcing bars protruding from the top surface of the panel in top concrete to integrate them.

However, when arranging the horizontal reinforcement, the conventional concrete panel is merely a flat plate as described above. Therefore, the arrangement position of the horizontal reinforcement is not clear and the arrangement of the reinforcement after the concrete panel is erected. In addition to the decision, the upper surface of the concrete panel had to be inked, and the reinforcing bars had to be arranged at predetermined intervals in accordance with this inking.

Such a bar arrangement work not only takes a lot of time and labor, but also when there are few skilled bar arranging workers at present, it may cause a delay in the construction and positioning by the persons involved in the construction. However, since the conventional concrete panel manufacturing method is as described above, it has never been desired to provide a concrete panel having a horizontal streak positioning mechanism.

[0006]

The problems to be solved by the present invention are as follows.
The purpose is to add a horizontal bar positioning mechanism to the concrete panel.

[0007]

The PC concrete panel of the present invention is a centrifugal molding apparatus made in view of the above-mentioned problems. "The upper surface (14) is formed into a columnar concave surface and the columnar concave surface (14) is formed. The upper end is formed obliquely toward the side surface (5c), and the ridgeline (11) at the boundary between the obliquely formed upper inclined part (5a) and the columnar concave surface (14) is cut (12). Things ”. As a result, when constructing a concrete floor, the horizontal reinforcements can be placed at predetermined intervals simply by fitting the horizontal reinforcements into the cutouts (12) of the concrete panel, and it is sufficient even if you are not a skilled barber. The work of arranging can be done quickly.

The PC concrete panel according to claim 2 further limits the notch of the PC concrete panel according to claim 1, in which a vertical groove-shaped sheer cotter (5b) is formed in the upper inclined portion (5a). The notch (12) is formed in the ridgeline (11) at the boundary with the columnar concave surface (14).

[0009]

The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is a cross-sectional view of a four-division centrifugal molding die (1) used for manufacturing a PC concrete panel according to the present invention.
The centrifugal mold (1) has a square cross section and can be divided into four parts from the corners. These split molds (1a) are connected by tightening bolts (8) screwed to the mounting ribs (15). It can be assembled. At least two disc-shaped rotary rails (9) are installed on the outer periphery of the centrifugal molding die (1) and are supported by a drive roller (10).

A partition wall (2) is erected in parallel with the axial direction on the inner circumference of the corner of the centrifugal molding die (1), and a drainage channel (3) for discharging excess water is provided inside. It is formed over the entire length of the partition wall (2). In the partition wall (2), a drainage hole (3a) communicating with the drainage channel (3) formed inside is formed in a side surface contacting the poured concrete (4). Also, partition wall (2)
The vertical side surface (2b) of the
(2d) is provided so as to form a vertical groove-shaped sheer cotter (5b) on the upper inclined surface (5a) of the PC concrete panel (5) as shown in FIG. The rectangular projection (2d) is shown in broken lines in FIG.

Reference numeral (7) is a filtering material, which is arranged between the plurality of partition walls (2) and the partition walls (2) and the poured concrete (4) so as to cover the drain hole (3a). ing. The filter material (7) is
Filter cloth, filter paper and others for pouring concrete (4)
Any of those that can filter only the excess water therein can be used.

[0012] First, top bars, bottom bars, truss bars and other reinforcing bars (13) are arranged between the partition walls (2), and
Attach the filtering material (7) to the inclined side surface (2c) of the partition wall (2),
Cover the drain hole (3a). Next, place a certain amount of concrete (4) in the centrifugal mold (1) (i.e. concrete during centrifugal molding).
Inject only (4) slightly beyond the partition wall (2) and rotate the cylindrical centrifugal molding die (1) to perform centrifugal compaction. At this time, the inner surface of the poured concrete (4) has a large amount of water and a low specific gravity, the leitance layer (6) {indicated by a phantom line in FIG. } Occurs, but only the excess water in the injected concrete (4) is filtered by the filter material (7), and the filtered excess water flows into the drainage channel (3) through the drain hole (3a). , The water content of the poured concrete (4) as a whole is reduced, and the laitance layer (6) is not generated. After forming the concrete molded body in this way, it is then cured. When the curing is completed, the tightening bolt (8) is removed, the centrifugal molding die (1) is broken, and the mold is removed.
Complete the concrete panel (5).

In the PC concrete panel (5) thus formed, the upper surface (14) is formed in the shape of a concave lens having a columnar cross section, and a reinforcing bar (partly embedded from the concave surface portion (14) ( 13) is protruding. The filter material (7) is integrally embedded in the abutment side surface portion (5c) as shown in FIG. Further, the upper end of the columnar concave surface (14) is formed obliquely toward the abutment side surface portion (5c), and a vertical groove-shaped Shercotter (5b) is formed on the obliquely formed upper inclined portion (5a). Is formed,
By forming this shear cotta (5b)
A notch (12) is formed on the ridgeline (11) at the boundary with (14). The shear cotta (5b) is used as a partition wall during centrifugal molding.
It is formed by a rectangular protrusion (2d) provided on the vertical side surface portion (2b) of (2). In the present embodiment, a configuration example of the notch (12) by the sheer cotter (5b) is shown, but of course, the present invention is not limited to this, and the ridge line (( It is also possible to construct by cutting out 11). The shear cotta (5b) to the notches (12) are formed at a predetermined interval.

FIG. 3 shows an example in which a PC concrete panel (5) formed by the above-mentioned four-division centrifugal molding method is installed on a foundation beam or a wall surface to form a bottom plate of a concrete floor (18) for on-site casting. In this case, the concave part (1
The reinforcing bar (13) protruding to 8) is embedded in the top concrete (17) forming the concrete floor (18), and the two are integrated. (16) is a horizontal streak fitted in the upper cutout (12) of the shear cotta (5b) of the PC concrete panel (5). By fitting the horizontal streaks (16) into the upper notches (12) of the shear cotta (5b), the positioning of the horizontal streaks (16) becomes easy.

Regarding the formation of the concrete floor (18),
Moisture in the top concrete (17) flows down between the abutting side surfaces (5c) of the PC concrete panel (5), but if the gap between the abutting side surfaces (5c) is sufficiently narrow, the filter medium (7) will be some extent. It fulfills the filtering function of, and only the excess water flows down and the dripping of concrete itself is prevented.

In the present embodiment, an example in which the centrifugal molding die (1) is divided into four parts has been mainly described, but the present invention is not limited to this, and may be divided into two parts or more parts. An appropriate number of divisions is adopted according to the sizes of the molding die (1) and the concrete panel (5) to be manufactured.

The compressive strength of the PC concrete panel (5) manufactured by the centrifugal molding method as described above is much higher than that of the conventional concrete panel manufacturing method.

Since the present invention has the above-described structure,
Originally, it is possible to mass-produce high-strength PC panels with a centrifugal molding machine used for manufacturing cylinders, and to provide a notch for locating bar arrangement on the top surface of PC concrete panels that could not be formed by conventional methods. The advantage is that not only is the bar arrangement work simpler, but also no skilled bar arranger is required.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an embodiment of a centrifugal molding die according to the present invention.

FIG. 2 is a cross-sectional view of an embodiment of a centrifugal molding die according to the present invention.

FIG. 3 is a drawing showing an example of use of a PC concrete panel manufactured according to the present invention.

FIG. 4 is a partial perspective view of a PC concrete panel manufactured according to the present invention.

[Explanation of symbols]

(1)… Centrifugal mold (1a)… Split mold (2)… Partition wall (3)… Drainage channel (3a)… Drainage hole (4)… Injected concrete (5)… PC concrete panel (6)… Laitance layer (7) ... Filter material (11) ... Ridge line (12) ... Notch

Claims (2)

[Claims] 1. An upper surface is formed into a columnar concave surface, and an end portion of the upper surface of the columnar concave surface is formed obliquely toward a side surface, and a ridgeline of a boundary between the obliquely formed upper inclined portion and the columnar concave surface is formed. PC concrete panel characterized by being cut out. 2. The PC concrete panel according to claim 1, wherein a notch is formed in a ridge line at a boundary with a columnar concave surface by forming a vertical groove-shaped sheer cotter in an upper inclined portion.