JPH06240843A - Precast concrete member and manufacture thereof - Google Patents

Abstract

PURPOSE:To impart various functions except normal characteristics such as durability, heat resistance, etc., with excellent productive efficiency by mixing a proper additive such as aggregate into a precast concrete member, in which a reinforcing material is mixed. CONSTITUTION:Uncured concrete 9, 9, in which a reinforcing material consisting of the fibers or grains of a metal, glass, carbon, aramid, etc., is mixed, is placed into forms 6 for a precast concrete member 1. Aggregates 3, 5 and a proper additive such as magnetic powder for displaying durability, weather resistance, shock resistance, electromagnetic wave resistance, moisture absorption and sound absorbing qualities are further mixed at that time. The additive is dispersed or arranged in a stratified shape in proper depth in the thickness direction of the precast concrete member 1 by applying centrifugal force, gravity and vibrations of a magnetic field, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber concrete precast concrete member and a method for producing the same.

[0002]

2. Description of the Related Art A fiber concrete precast concrete (PC) member containing fibers such as metal, glass, carbon and aramid as a reinforcing material is suitable as an exterior material for covering the surface of a structure as a lightweight material having strength. It is something.

Such a fiber concrete type precast concrete (PC) member has durability, weather resistance,
In order to have various functions such as impact resistance, electromagnetic wave resistance, moisture absorption, heat insulation, and sound absorption, materials that exhibit these functions are individually selected and laminated. For example, as a material exhibiting durability, weather resistance, and impact resistance, a decorative material such as tile, a concrete thin plate having excellent strength, a metal plate coated with a resin, or the like is a magnetic material that exhibits electromagnetic wave resistance. An example is a plate made of material or paint.

Porous moisture absorbing plates, heat insulating plates, sound absorbing plates and the like are examples of those having a moisture absorbing function, heat insulating properties and sound absorbing properties.

[0005]

In order to sequentially laminate materials having these various functions on a precast concrete (PC) member in a step-by-step manner, a considerably large number of steps are required, and also for the next step. It takes time and effort because it is necessary to make efforts to ensure accuracy.

Further, the precast concrete members formed by stacking are bulky and heavy, and the work efficiency such as mounting becomes poor.

The object of the present invention is to eliminate the inconveniences of the above-mentioned conventional examples, and to produce a precast concrete member having various functions other than a certain function, the number of steps is small,
It is an object of the present invention to provide a precast concrete member and a method for manufacturing the same, which can increase the production efficiency, and the resulting member is compact and lightweight.

[0008]

In order to achieve the above-mentioned object, the present invention provides a precast concrete member which is durable in a precast concrete member in which fibers or particles such as metal, glass, carbon and aramid are mixed as a reinforcing material. Whether to add proper additives directly to the concrete or to add them to the reinforcing material in order to exert the individual, or composite, weather resistance, impact resistance, electromagnetic wave resistance, moisture absorption, heat insulation, and sound absorption. Then, the precast concrete member is dispersed or fixed at a proper depth in the thickness direction of the precast concrete member, and as a method for producing the precast concrete member, a mold having an appropriate shape for molding the precast concrete member is used. To
A fiber or particle reinforcing material typified by metal, glass, carbon, aramid, etc. and a suitable additive for exhibiting durability, weather resistance, impact resistance, electromagnetic wave resistance, moisture absorption, and sound absorption are not mixed. After pouring hardened concrete, by adding gravity or magnetic field such as centrifugal force, vibration, etc., the additive is dispersed in a proper depth in the thickness direction of the precast concrete member or arranged in layers to form a functionally graded member. The main point is to do.

[0009]

According to the present invention, it suffices to add a member exhibiting various functions at the stage of forming a precast concrete member into a form, and it does not take a plurality of steps as in the case of stacking.

Further, the obtained product can also exhibit these various functions inside the member, so that the member can be made compact, the volume of the building can be expected to increase, the weight can be reduced, and the work efficiency can be improved. .

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional front view showing one embodiment of the precast concrete member of the present invention.

Precast concrete member 1 of the present invention
Is a fiber concrete type material in which fibers 2 or particles such as metal, glass, carbon, or aramid are mixed as a reinforcing material.

The precast concrete member 1 contains appropriate additives so as to exhibit durability, weather resistance, impact resistance, electromagnetic wave resistance, hygroscopicity, heat insulation and sound absorption individually or in combination. The particles were dispersed or fixed in layers at an appropriate depth in the thickness direction.

Among these additives, durability, weather resistance,
In order to exert impact resistance, the outer surface of the precast concrete member 1 may be made of solid concrete.

To this end, fine aggregates 3 such as sand or aggregates having a high density or being susceptible to magnetism may be densely packed with the fibers 2 near the outer surface of the precast concrete member 1.

In order to exhibit electromagnetic wave resistance, a magnetic powder 4 such as metal or ferrite is added as an additive to close the outer surface of the precast concrete member 1. Note that the magnetic powder 4 may be added to the fiber 2 in advance in order to increase the specific gravity.

Further, when the fiber 2 is steel or carbon, if these are made to be a magnetic material, the electromagnetic wave resistance can be exhibited without adding an additive.

In order to exhibit hygroscopicity, heat insulation and sound absorption, the inner surface of the precast concrete member 1 may be made of porous concrete. For this purpose, a lightweight and relatively large aggregate 5 or an aggregate having a low density or being less susceptible to magnetism may be arranged near the inner surface of the precast concrete member 1. The relatively large aggregate 5
A porous artificial aggregate or the like can be used for the.

Next, the manufacturing method will be described. As shown in FIG. 2, a mold 6 having an appropriate shape is used to mold a precast concrete member. The mold 6 is placed on a rotary table 7 so that centrifugal force can be applied, The magnetic field line generator 8 is opposed to allow the magnetic force to be applied. Both gravity and magnetic force such as centrifugal force may be applied. Further, although not shown, vibration may be applied by a vibrating machine.

In this way, a reinforcing material made of fibers 2 or particles typified by metal, glass, carbon, aramid, etc. and durability, weather resistance, impact resistance, electromagnetic wave resistance as required in the mold 6 are obtained. Uncured concrete 9 mixed with appropriate additives that should exhibit the properties of water absorption, hygroscopicity, and sound absorption, and add centrifugal force, magnetic field, vibration, etc. with the rotary table 7, magnetic field generator 8 and vibrator. .

As a result, the fibers 2, the fine aggregate 3, and the magnetic powder 4 gather near the outer surface of the precast concrete member 1, while the lightweight and relatively large aggregate 5 having a small specific gravity does not move much and moves inside. Collecting near the surface, the precast concrete member 1 is molded as a member having an inclination function in the thickness direction.

Although not shown in the drawings as another embodiment, the mold 6 is made up of several layers in a cylindrical shape, and an arc-shaped semi-dry precast concrete member molded by such a mold 6. It is also possible to lay 1 on a flat place to produce a flat plate without arcs.

[0023]

As described above, the precast concrete member of the present invention and the method for producing the same require only a small number of steps and increase production efficiency when producing a precast concrete member having various functions other than ordinary characteristics. Is something that can be done.

Further, since the obtained precast concrete member is compact and lightweight, the volume of the building can be expected to increase, and the work efficiency such as mounting can be improved.

Further, by improving the prefabricated rate, the construction period can be shortened and the accuracy can be improved, and the automation efficiency of building production can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a precast concrete member of the present invention.

FIG. 2 is a perspective view showing one embodiment of a method for manufacturing a precast concrete member according to the present invention.

[Explanation of symbols]

1 ... Precast concrete member 2 ... Fiber 3 ... Fine aggregate 4 ... Magnetic powder 5 ... Large aggregate 6 ... Formwork 7 ... Rotating table 8 ... Magnetic line generator 9 ... Unhardened concrete

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Haruya Kawaguchi 4-51, Ota-cho, Naka-ku, Yokohama-shi, Kanagawa Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor, Shoji Shimamura Ota-machi, Naka-ku, Yokohama-shi, Kanagawa 4-chome 51 Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Takei ▲ Kichi ▼ ichi 2-2-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute

Claims (6)

[Claims] 1. A precast concrete member in which fibers or particles typified by metal, glass, carbon, aramid, etc. are mixed as a reinforcing material, and durability, weather resistance, impact resistance, electromagnetic wave resistance, hygroscopicity, and heat insulating property are obtained. , In order to exert sound absorbing properties, appropriate additives are mixed directly in concrete or added to a reinforcing material to disperse or fix the precast concrete member at an appropriate depth in the thickness direction or in a layered manner. Precast concrete member characterized by. 2. Additives that exhibit durability, weather resistance, impact resistance, and electromagnetic wave resistance are arranged near the outer surface, and additives that exhibit hygroscopicity, heat insulation, and sound absorption are located near the inner surface. The precast concrete member according to claim 1, which is arranged. 3. The precast concrete member according to claim 1, wherein the additive is an aggregate. 4. A fiber or particle reinforcing material represented by metal, glass, carbon, aramid, etc. in a mold having a shape suitable for forming a precast concrete member, durability, weather resistance, impact resistance, After placing uncured concrete mixed with appropriate additives that should exhibit electromagnetic wave resistance, moisture absorption, and sound absorption, the additives are added to precast concrete by adding gravity, magnetic field or vibration such as centrifugal force. A method for producing a precast concrete member, characterized in that the member is dispersed or layered at an appropriate depth in the thickness direction of the member to form a functionally gradient member. 5. An additive exhibiting durability, weather resistance, impact resistance and electromagnetic wave resistance is arranged near the outer surface, and an additive exhibiting hygroscopicity, heat insulation and sound absorbing property is arranged near the inner surface. The precast concrete member according to claim 4, which is arranged. 6. The precast concrete member according to claim 4, wherein the additive is an aggregate.