JPH06307006A - Manufacture of steelwork reinforced pc panel - Google Patents

Abstract

PURPOSE:To greatly reduce the work load and to produce products having a stably uniform quality by setting a board between a reinforcing steelwork and uncured concrete so as to serve as an inner form which is adapted to be vibrated. CONSTITUTION:On the reinforcing steelwork 8 side of a PC panel, a board 12 is set between the reinforcing steelwork 8 and uncured concrete 7, and is then integrally incorporated with the steel work 8 in order to serve as an inner form. Then, a vibrator 15 is set on the thus formed inner form, and is excited while the concrete 7 is placed. Accordingly, the placing of the concrete 7 can be extremely simplified, and can be uniform, thereby it is possible to facilitate the trowelling finish at the final step.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a steel frame reinforced PC
Regarding (precast concrete) panels.

[0002]

2. Description of the Related Art A conventional steel-reinforced PC panel is shown in FIG.
It was generally manufactured by the method as shown in.
That is, after combining the bed mold 1 and the side mold 2, a surface finishing material 6 such as a tile or a stone, which is a surface material of the PC panel, is placed on the bed mold 1 as required, The uncured concrete 7 is poured, the embedded metal (anchor) 5 is embedded therein by using the steel frame 4 for setting the embedded metal set, and the concrete 7 of the rib portion is further injected by using the inner mold 3. The uncured concrete 7 is poured after the internal cavities and the like are removed by using the rod-shaped vibrator 11. After that, the reinforcing steel frame 8 is installed using the taper washer 9 and the nut 10 to obtain the steel frame-reinforced PC panel. As another method, a method of installing the reinforcing steel frame 8 before placing concrete is also used.

[0003]

However, when such a method is used, the stick-shaped vibrator 11 collides with the surface finishing material 6 and damages it, or the vibration range of the stick-shaped vibrator 11 is narrow, so forget to put it on. There was a possibility that concrete was not evenly placed on the entire PC panel including the above. The method of using the rod-shaped vibrator 11 has a problem that the work is complicated and, in addition, the back surface (the side having the reinforcing steel frame) needs to be troweled, which requires manpower.

In addition, when the reinforcing steel frame is installed after the concrete is poured, the positions of the holes of the embedded metal 5 and the reinforcing steel frame 8 are deviated from each other, which makes it difficult to install the reinforcing steel frame 8. Sometimes became. On the other hand, when the reinforcing steel frame 8 is set in advance, there is a problem that the reinforcing steel frame 8 becomes a hindrance to driving, and at the same time, it becomes difficult to finish the last iron, and improvement of these problems has been desired.

[0005]

Therefore, as a result of earnest studies, the inventors of the present invention installed a board between the reinforcing steel frame 8 and the uncured concrete, and used this as an internal form to give vibration. According to the above, the inventors have found that such a problem can be solved, and arrived at the present invention. That is, an object of the present invention is to solve at once the problems such as the complexity of the work, the unevenness of the placement, the fear of damage, etc. as described above, and the object of the present invention is to provide a PC having a reinforcing steel frame. In the panel manufacturing method, a board is installed between the reinforcing steel frame and the uncured concrete on the side of the reinforcing steel frame of the PC panel, and is integrated with the reinforcing steel frame so as to also serve as an inner formwork. A method for manufacturing a PC panel characterized by vibrating a frame, more preferably the above-mentioned method for manufacturing a PC panel, in which a taper molding for forming a rib portion is installed on a side of a reinforcing steel frame of the PC panel, More easily achieved.

The present invention will be described in detail below. An example of a typical manufacturing method of the present invention is shown in FIG. Similar to the structure shown in FIG. 3, after combining the bed mold 1 and the side mold 2, a surface finishing material 6 such as a tile or a stone which is a surface material of the PC panel is placed on the bed mold 1 as required. It is installed and uncured concrete 7 is poured from above. After that, the embedded metal (anchor) 5 is embedded at a desired position. It is convenient and preferable to use a plate 13 on the embedded metal (anchor) 5 for standing the embedded metal 5 straight on uncured concrete. A board 12 is placed thereon, and a reinforcing steel frame 8 is further placed by using an embedded metal piece 5. As a result, the board 12 and the reinforcing steel frame 8 are integrated and work as an inner formwork. Further, in order to adjust the shape of the rib portion, a taper molding 14 which is made of a known material such as urethane, styrofoam, or wood and which can transmit the vibration of the mold to the uncured concrete may be used. It is preferable that the board 12 be appropriately perforated in order to discharge air bubbles generated during concrete pouring and vibration filling to the outside of the PC panel. Since the size and density of the holes differ depending on the thickness of the PC panel and the like, it is sufficient to conduct experiments before mass production to obtain the required size and density. As the material of the board 12, various boards which are usually used as an interior material or an exterior material can be used. For example, a plastic board such as a calcium silicate board, an asbestos cement board or a vinyl chloride board,
A wooden plate or a metal plate such as SUS or SS can be used, but a highly rigid material that easily transmits vibration is preferable. Depending on the type of concrete to be placed, it should be selected so that problems such as electrolytic corrosion do not occur. Good. Any known method can be used to connect the reinforcing steel frame 8 to the board 12 and the embedded metal 5 without any trouble, and for example, a taper washer or a nut may be used.

The vibrator 1 is attached to the inner mold thus formed.
By mounting 5 and pouring concrete while vibrating it, various problems described above can be solved at once. The vibrator 15 used in the present invention may be any one that can be attached to a mold or the like, but one having a high-frequency vibration motor with excellent vibration efficiency is particularly preferable.

The concrete to be poured also includes reinforced fiber concrete such as glass fiber reinforced concrete, synthetic fiber reinforced concrete, carbon fiber reinforced concrete, and steel reinforced concrete. The fiber-reinforced concrete described above also includes fiber-reinforced concrete excluding coarse aggregate. Further, it goes without saying that a variation of the present invention can be applied to a structure having no rib portion as shown in FIG.

[0009]

[Example] Chichibu Cement's "High-Acyrus Cement" (100 parts by weight), lightweight aggregate (25 parts by weight), short fiber pitch high strength / high elasticity carbon fiber bundle (Mitsubishi Kasei's carbon fiber "Diary") "(3 parts by weight), a thickener and a defoaming agent (0.25 parts by weight in total) were put into a mixer and kneaded for 1 minute. Next, water in which citric acid (0.5 parts by weight) was dissolved and a water reducing agent (total 48 parts by weight) were added as a setting retarder, and the mixture was kneaded for 1 minute. The kneading amount was 0.4 m ³ . After kneading, tiles of 45 mm square and bar arrangement (mesh nodes: diameter 4 mm, width 150 mm, rib cage cage rebar: main bar; 4 with 10 mm diameter for cross section of rib section, rib section reinforcing bar: 4 mm diameter, 100 mm
Form frame (width: 2245mm × 119)
The CFRC slurry kneaded to a thickness of 5 mm and a thickness of 150 mm) was spread with a scoop, a trowel or the like so that the thickness was about 10 cm. On top of that, reinforcing steel (H-
150 × 75 × 5 × 7) and asbestos cement calcium silicate board (J
A board of ISA5418 equivalent product, thickness 12 mm) was placed on an inner formwork in which embedded anchors (SR24, 13φ × 2) were fixed with M16 nuts via liner plates SS41PL-65 × 65. Four reinforcing steel frames were installed along the outer periphery of the thin plate portion of the product PC panel, and embedded anchors were installed at four locations. The reinforcing steel frame of the inner mold is provided with a urethane taper-molded product between the reinforcing steel frame and the outer peripheral rib portion so that the thin plate portion of the product PC panel has a thickness of 50 mm. Adjustable high-frequency vibrator on the placed inner mold (vibrator manufactured by Tokudenki Kogyo KK: Model HV750
B, frequency 6000-7200VPM, output 0.75K
W) was attached and shaken for 3 minutes. After that, the upper ends of the ribs were flattened with a trowel and finished. The working time was 15 minutes from the end of kneading. After that, the sheet was hung and cured, and the mold was removed the next day. The adhesive strength of the tile was measured one month after the material was removed from the mold, according to the tile adhesion strength measuring method of Kenken type. The number of measurements was 10 points. Table 1 shows the average adhesion strength,
The coefficient of variation and the time required for setting are shown.

[0010]

[Comparative Example] CF kneaded under the same procedure and conditions as in Example
A tiled PC panel having the same shape as the RC slurry manufactured in the example was manufactured using a rod-shaped vibrator and a box-shaped vibrator. The casting was performed in order from the rib portion to the thin plate portion. The rib portion was sequentially applied with a bar-shaped vibrator while pouring the CFRC slurry. Box-shaped vibrators were sequentially applied to the entire thin plate. The vibrator was operated in the same place for at least 5 seconds while stationary. After that, the work of adjusting the thickness of the thin plate portion and the work of finishing the entire surface were performed using a trowel or the like. Next, asbestos cement calcium silicate plate similar to that of the embodiment and an embedded anchor (SR24, 13φ × 2) previously attached to a predetermined position of the formwork were attached to a portion corresponding to the thin plate portion of the product PC panel, and a liner plate SS41PL. It fixed with the M16 nut through -65x65. The working time was 1 hour and 20 minutes from the end of kneading. Table 1 shows the average value of the adhesion strength of tiles for one month of age, the coefficient of variation, and the time required for casting.

[0011]

[Table 1]

[0012]

According to the manufacturing method of the present invention, by installing a vibrator in the inner formwork consisting of reinforcing steel frames and boards and vibrating the entire inner formwork, the concrete can be filled very easily and evenly. Since the main work is only to set the inner formwork after the concrete is put in, it is possible to provide a method for manufacturing a steel-frame reinforced PC panel capable of significantly reducing the work amount as compared with the conventional placing method.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a steel frame reinforced PC panel of the present invention.

FIG. 2 is an explanatory view showing an example of a steel frame reinforced PC panel of the present invention.

FIG. 3 is an explanatory view showing an example of a conventional steel frame reinforced PC panel.

[Explanation of symbols]

 1 Bed Form 2 Side Form 3 Inner Form 4 Steel Frame for Embedded Hardware Set 5 Embedded Hardware (Anchor) 6 Surface Finishing Material 7 Concrete 8 Reinforcing Steel Frame 9 Taper Washer 10 Nut 11 Rod Vibrator 12 Board 13 Plate 14 Forming for Taper Product 15 vibrator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirofumi Ota, No. 1 Shiroishi Kurosaki, Yawatanishi-ku, Kitakyushu, Fukuoka Prefecture Mitsubishi Kasei Co., Ltd. Kurosaki Plant

Claims (2)

[Claims] 1. A method of manufacturing a PC panel having a reinforcing steel frame, wherein a board used as an inner formwork is installed between the reinforcing steel frame and uncured concrete on the reinforcing steel frame side of the PC panel, A method for manufacturing a steel-frame-reinforced PC panel, which is integrated with a reinforcing steel frame so as to be used also as an inner mold and vibrates the inner mold. 2. A taper molded product for forming a rib portion is installed on a side of a reinforcing steel frame of the PC panel.
A method for manufacturing the described PC panel.