JPH07124917A - Surface treating method for pc product by immediate removal from form - Google Patents

Abstract

PURPOSE:To protect a concrete surface in removal from a form and remarkably improve an integrity of a surface finishing material through a woven or nonwoven fabric by a method wherein before a concrete is placed, the woven or nonwoven fabric is previously attached to a concrete-contact surface of the form so as to be integrated in the concrete surface at the time of removal. CONSTITUTION:Before a concrate 14 is placed inside a form 12, a woven (or nonwoven) fabric 16 is attached to an inner surface 12a of the form 12. Immediately after the concrete 14 is placed inside the woven fabric 16, a vibrating rod 2U is inserted into the center of the form 12 to pressurize and vibrate the concrete 14, and the concrete 14 is immediately removed from the form. At the time of removal of the concrete 14 from the form, the woven fabric 16 adheres to the surface of the concrete 14 to prevent the surface of the concrete 14 from being directly rubbed with the form surface 12a. Furthermore, an integrity of a finishing material is remarkably improved through the woven fabric 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment method for a PC product which is immediately released from a cast concrete by applying vibration and pressure thereto.

[0002]

2. Description of the Related Art Conventionally, a PC (precast concrete) product, for example, a hollow product such as a concrete pipe or a PC column formwork for construction, has a shape along the inside and outside of the PC product. After using inner and outer molds and arranging the inner and outer molds in a concentric manner, concrete is placed in the space between the molds, and after that, when the concrete solidifies or hardens. It is designed to be released from the mold.

In recent years, in order to improve the manufacturing efficiency of the PC products, Japanese Patent Publication No. 1-15361 (B28B 1).
No. 08), the molding formwork is filled with 0 slump concrete and applied to a vibrating table, and the concrete is pressed to apply a pressing force to accelerate the solidification of the concrete, and thus to immediately release the concrete. Something that allows for molds has been proposed.

[0004]

However, such a conventional PC product for immediate demolding is, by its nature, demolded before the concrete is completely hardened. The surface of the concrete is damaged and becomes a rough surface. For this reason, after immediate mold removal, cement paste or a thin plastering material is applied to the concrete surface by means of a trowel, roller, spraying or the like, and then steam curing is performed. However, when the surface finishing of concrete is performed by such a post-treatment, after the demolded concrete body is hardened, the binding property with the cement paste or the finishing material such as plastering material is poor, and There is a problem that peeling may occur.

Therefore, in view of the conventional problems, the present invention attaches a woven cloth or a non-woven cloth to the formwork surface which the concrete comes into contact with before placing the concrete, and at the time of demolding, the woven cloth or the non-woven cloth. Provides a surface treatment method for PC products by instant demolding, in which the woven or non-woven fabric is used as a medium to significantly improve the binding property of the surface finish material while protecting the concrete surface by integrating The purpose is to do.

[0006]

In order to achieve the above object, the present invention provides a PC product which enables immediate demolding by applying pressure and vibration to concrete placed in a mold. Before the casting, a woven cloth or a non-woven cloth is attached to the surface of the formwork which the concrete comes into contact with so that the woven cloth or the non-woven cloth is integrated with the surface of the cast concrete.

[0007]

In the surface treatment method for PC products by the immediate demolding described above, when the concrete is demolded from the formwork, the woven or non-woven fabric attached to the formwork surface is removed while being adhered to the concrete surface. Typed. Therefore, since the concrete surface can be protected by the woven or non-woven fabric at the time of releasing the mold, it is possible to prevent the concrete surface from being damaged. Further, since the surface of the concrete is integrally covered with the woven or non-woven fabric, the binding property between the plastering material and the finishing material such as tiles is remarkably improved by using the woven or non-woven fabric as a medium.

[0008]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of a surface treatment method for a PC product by instant demolding according to the present invention, and FIG. 1 is a cross-sectional view showing a concrete pouring state on a mold, FIG.
Is a cross-sectional view showing a state in which the mold is immediately removed from the mold, and FIG. 3 is a cross-sectional view showing a state in which concrete is surface-treated with a finishing material.

That is, in this embodiment, the PC member 10 for building materials is used.
As an example, the PC member 10 is molded using the mold 12. That is, the P
The outer shape of the C member 10 is shaped.

Then, the PC member 10 is molded by placing concrete 14 inside the form 12, but in this embodiment, before the concrete 14 is placed, the inner surface of the form 12 is molded. A woven fabric (or a non-woven fabric) 16 is attached to the (form frame surface) 12a. Next, the woven fabric 16
Concrete 14 is placed in a state where the wire mesh 18 is inserted into the mold 12 inside.

Immediately after placing the concrete 14, the vibrating rod 20 is inserted into the center of the formwork 12. By inserting the vibrating rod 20, the concrete 14 is pressurized and vibrated, so that the solidification of the concrete 14 is significantly promoted. Then, as the concrete 14 is solidified within a short period of time, the concrete 14 has a shape-retaining property, and in this state, the mold 12 and the vibrating rod 20 are extracted and immediately released from the mold. When the concrete 14 is removed from the mold, the woven fabric 16 is attached to the surface of the concrete 14 to be integrated as shown in FIG.

Then, the concrete 14 which has been demolded
Finishing material 22 such as plastering material or tile is troweled on the surface of, and processed by rollers, spraying or pressure bonding to finish.

As described above, in the surface treatment method for the concrete 14 which is immediately released from the mold according to the present embodiment, the concrete 14 is placed with the woven cloth 16 attached to the mold surface 12a, and the vibrating rod is attached to the concrete 14. Since the mold is immediately removed by inserting 20 and applying pressure and vibration, when removing the concrete 14 from the form 12, the form surface 12a
The woven fabric 16 attached to is removed from the concrete 14 while being attached to the surface of the concrete 14.

Therefore, since the concrete 14 is protected by the woven fabric 16 at the time of demolding, the surface of the concrete 14 is prevented from being directly rubbed by the mold surface 12a, and by extension, the surface of the concrete 14 is damaged. Can be prevented.

When the surface of the concrete 14 is finished with a plastering material or a finishing material 22 such as a tile, since the surface of the concrete 14 is covered with a woven cloth (or a non-woven cloth) 16, the woven cloth 16 is used as a medium. The binding property of the finishing material 22 is significantly improved. That is, the woven cloth (or non-woven fabric) 16 has fluffed thin threads, and the finishing material 22 is entangled with the fluffed thin threads, so that the binding property of the finishing material 22 is improved. Therefore, the finishing material 22 can be prevented from being peeled off with time, and its durability can be remarkably improved.

In the present embodiment, the PC member 10 is taken as an example, but it is needless to say that the present invention can be applied to other hollow pillar members that are immediately released from the mold.

[0017]

As described above, in the surface treatment method for a PC product by the instant demolding according to the present invention, the mold surface to which the concrete comes in contact before the concrete is placed in the mold. Since the woven or non-woven fabric is attached to the mold, when removing the concrete from the formwork, the woven or non-woven fabric attached to the formwork surface is removed while being attached to the concrete surface. Sometimes the woven or non-woven fabric can protect the concrete surface. Therefore, the concrete surface can be prevented from being damaged, and the woven or non-woven fabric covering the surface of the concrete is used as a medium to improve the binding property to plastering materials or finishing materials such as tiles, and In addition, there is an excellent effect that the durability can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a concrete pouring state on a formwork showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a mold is immediately released from a mold in an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state where concrete is surface-treated in one example of the present invention.

[Explanation of symbols]

 10 PC member 12 Formwork 14 Concrete 16 Woven cloth (nonwoven fabric) 20 Vibration rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Miki Aoyama 4-640 Shimoseido, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute Co., Ltd. (72) Yoshimasa Hayashi 4-640 Shimoseido, Kiyose-shi, Tokyo Obayashi Engineering Co., Ltd. In the laboratory (72) Haruka Ogawa 4-640 Shimo-Seido, Kiyose-shi, Tokyo Inside the Obayashi Technical Research Institute, Inc. (72) Inventor Tatsuya Wakisaka 4-640, Shimo-Seido, Tokyo In the Obayashi Technical Research Institute (72) Inventor Noriyuki Furuya 4-640 Shimoseido, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute Co., Ltd. (72) Inventor Kofumi Hamada 4-640 Shimoseido, Kiyose City Tokyo (72) Inventor Takayuki Sone Tokyo 2-3 Kandajimachi, Chiyoda-ku, Tokyo Stock company Obayashi Corporation Tokyo head office

Claims (1)

[Claims] 1. A PC product that enables immediate demolding by applying pressure and vibration to concrete poured into a formwork, wherein the formwork surface to which the concrete comes in contact before the concrete is placed. A method for surface treatment of a PC product by immediate demolding, which comprises attaching a woven fabric or a non-woven fabric to the above and integrating the woven fabric or the non-woven fabric on the surface of the cast concrete.