JP2903078B2 - Precast concrete member and method of manufacturing the same - Google Patents

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 Fiber concrete precast concrete (PC) members in which fibers such as metal, glass, carbon, and aramid are mixed as reinforcing materials are suitable as exterior materials for covering the surface of structures as lightweight materials having strength. It is something.

Such fiber concrete precast concrete (PC) members have durability, weather resistance,
In order to provide various functions such as impact resistance, electromagnetic wave resistance, moisture absorption, heat insulation, sound absorption, etc., materials exhibiting these functions are individually selected and laminated. For example, those that exhibit durability, weather resistance, and impact resistance include magnetic materials such as decorative materials such as tiles, thin concrete sheets and metal plates with resin coating that are excellent in strength, and those that exhibit electromagnetic wave resistance. Plates and paints made of materials are examples.

[0004] Porous moisture absorbing plates, heat insulating plates, sound absorbing plates, and the like are examples of those exhibiting a moisture absorbing function, heat insulating properties, and sound absorbing properties.

[0005]

In order to sequentially laminate the materials having these functions on a precast concrete (PC) member step by step, a considerably large number of steps are required, and the accuracy for the next step is increased. It took time and effort because it was necessary to make efforts to secure it.

[0006] Further, the precast concrete members laminated are bulky and heavy, and the work efficiency of mounting and the like is poor.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to reduce the number of steps required for producing a precast concrete member having functions other than a certain function.
Precast concrete members with various functions that can increase the efficiency of production and are compact and lightweight, and have the characteristics necessary to improve the environment inside and around the building, especially And a method for manufacturing the same.

[0008]

According to the present invention, in order to achieve the above object, as a precast concrete member, fibers as a reinforcing material are mixed, and fine and high-density aggregates are arranged near an outer surface. In addition, relatively large, lightweight aggregates with low density are placed near the inner surface, and magnetic materials are placed near the outer surface, and durability, weather resistance, impact resistance, electromagnetic wave resistance near the outer surface Function and a moisture-absorbing, heat-insulating, and sound-absorbing material near the inner surface, or by mixing fibers as a reinforcing material, and fine and dense aggregate near the outer surface. A relatively large, lightweight, low density aggregate is disposed near the inner surface; and the fibers are steel fibers, which are disposed as a magnetic material near the outer surface; In durability, weather resistance, impact resistance, to exhibit resistance to electromagnetic wave, hygroscopicity near the inner surface, heat insulation, it is an Abstract that it has a functionally gradient member to exert sound absorption.

[0009] Further, as a method of manufacturing a precast concrete member, a fiber reinforcing material, a fine aggregate having a high density, a relatively large grain and a lightweight material are provided in a mold having an appropriate shape for forming the precast concrete member. After placing unhardened concrete mixed with a low-density aggregate and a magnetic substance as an additive, fine and high-density aggregate and magnetic Place the body near the outside surface of the precast concrete member, and place relatively large, lightweight, low-density aggregates near the inside surface to secure it at the appropriate depth in the thickness direction, for durability and weather resistance near the outside surface Functionally graded material that exhibits heat resistance, impact resistance and electromagnetic wave resistance, and exhibits moisture absorption, heat insulation and sound absorption near the inner surface, or precast concrete part An uncured mixture of steel fiber reinforcement, fine and high-density aggregate, and relatively large and light-weight and low-density aggregate as additives in a mold having an appropriate shape to mold After placing concrete,
By applying gravity, vibration, magnetic field, or the like such as centrifugal force, the fine and high-density aggregate and the steel fiber as a magnetic material are placed near the outer surface of the precast concrete member, and the relatively large, lightweight, low-density bone is used. Arrange the material near the inner surface, fix it at the appropriate depth in the thickness direction, exhibit durability, weather resistance, impact resistance, electromagnetic wave resistance near the outer surface, absorb moisture and heat insulation near the inner surface The gist of the present invention is to provide a functionally graded member exhibiting sound and sound absorbing properties.

[0010]

According to the first and third aspects of the present invention, a fine aggregate such as sand or a high-density aggregate such as sand is employed as a material exhibiting durability, weather resistance and impact resistance. This allows the outer surface of the precast concrete member to be solid concrete,
In addition, as a material that exhibits moisture absorption, heat insulation, and sound absorption, lightweight and relatively large aggregates such as porous artificial aggregates, or aggregates with a low density or less susceptible to magnetism, are precast. By arranging it near the inner surface of the concrete member, it is possible to achieve sufficient weight reduction and various performances as a porous concrete.Additionally, added a member that demonstrates various functions at the stage of forming the precast concrete member It does not involve multiple steps as in the case of lamination.

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 increased, the weight can be reduced, and the working efficiency can be improved. .

Further, the outer surface of the precast concrete member can be provided with electromagnetic wave resistance by a magnetic powder such as metal or ferrite or a magnetic material made of steel. An optimum product can be obtained quickly and efficiently by applying gravity, magnetic field, vibration, etc. such as centrifugal force.

According to the present invention as set forth in claims 2 and 4, in addition to the above effects, when the fiber is steel,
This becomes a magnetic material, and the electromagnetic wave resistance can be exhibited without adding an additive as a magnetic material separately.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional front view showing one embodiment of a 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 such as metal, glass, carbon, and aramid are mixed as a reinforcing material.

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

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

For this purpose, fine aggregate 3 having high density, such as sand, and fibers 2 may be densely packed near the outer surface of 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 and is densely packed near the outer surface of the precast concrete member 1. In order to increase the specific gravity, the magnetic powder 4 may be added to the fiber 2 in advance.

Further, when the fiber 2 is steel, it becomes a magnetic material, and can exhibit electromagnetic wave resistance without adding any additional additives.

The inner surface of the precast concrete member 1 may be made of porous concrete in order to exhibit moisture absorption, heat insulation and sound absorption. To do so, a light-weight, relatively large-grain, low-density aggregate that is less susceptible to magnetism may be placed near the inner surface of the precast concrete member 1. As the relatively large aggregate 5, a porous artificial aggregate or the like can be used.

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 force is applied to the magnetic field generator 8 so as to be applied thereto. Gravity such as centrifugal force and magnetic force may be applied to both. Although not shown, vibration may be applied by a vibration exciter.

As described above, the reinforcing member made of the fibers 2 or particles typified by metal, glass, carbon, aramid, etc., and the durability, weather resistance, impact resistance, Of unhardened concrete 9 mixed with an appropriate additive to exhibit the properties, moisture absorption, and sound absorption, and apply centrifugal force, magnetic field, vibration, etc. using the turntable 7, the magnetic field generator 8 and the vibration generator. .

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, relatively large aggregate 5 having a small specific gravity moves inward without moving much. Collected near the surface, the precast concrete member 1 is formed as a member having a function of tilting in the thickness direction.

Although not shown in the drawings as another embodiment, it is assumed that the mold 6 has several layers in a cylindrical shape, and an arc-shaped semi-dry precast concrete member formed by such a mold 6. 1 can be laid on a flat place to produce a flat plate without arcs.

[0026]

As described above, the precast concrete member of the present invention and the method of manufacturing the same require only a small number of steps and increase the production efficiency when manufacturing a precast concrete member having various functions other than ordinary characteristics. Is what you can do.

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

Further, by improving the prefabrication ratio, the construction period can be shortened and the accuracy can be improved, and the automation efficiency of building production can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing one 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 of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Precast concrete member 2 ... Fiber 3 ... Fine aggregate 4 ... Magnetic powder 5 ... Large aggregate 6 ... Formwork 7 ... Rotary table 8 ... Magnetic field generator 9 ... Unhardened concrete

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Haruya Kawaguchi 4-51, Otacho, Naka-ku, Yokohama-shi, Kanagawa Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Shoji Shimamura Ota-cho, Naka-ku, Yokohama-shi, Kanagawa 4-51, Kashima Construction Co., Ltd., Yokohama branch (72) Inventor Takei, Yoshikazu 2-9-1-1, Tobita-Sen, Chofu-shi, Tokyo Kashima Construction Co., Ltd., Technical Research Institute (56) References JP-A-3-3 183508 (JP, A) JP-A-4-30062 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04C 2/04 C04B 14/30 C04B 14/38 E04B 1/92

Claims (4)

(57) [Claims] Claims: 1. A fiber as a reinforcing material is mixed, and a fine and dense aggregate is arranged near an outer surface;
In addition, relatively large, lightweight aggregates with low density are placed near the inner surface, and magnetic materials are placed near the outer surface, and durability, weather resistance, impact resistance, electromagnetic wave resistance near the outer surface Precast concrete member characterized in that it is a functionally graded member that exerts moisture absorption, heat insulation and sound absorption near the inner surface. 2. Mixing fiber as a reinforcing material and disposing fine and dense aggregate near the outer surface;
In addition, a relatively large, lightweight, low-density aggregate is disposed near the inner surface, and the fiber is a steel fiber, which is disposed as a magnetic substance near the outer surface, and has a durability near the outer surface. A precast concrete member characterized by being a functionally graded member that exhibits weather resistance, impact resistance, and electromagnetic wave resistance, and exhibits moisture absorption, heat insulation, and sound absorption near the inner surface. 3. A fiber reinforced material, a fine and high-density aggregate, a relatively large and light-weight and low-density aggregate, and a magnetic material in a form having a shape suitable for forming a precast concrete member. After placing unhardened concrete mixed with the body as an additive, by applying gravity, vibration, magnetic field, etc., such as centrifugal force, fine and high-density aggregate and magnetic material are near the outer surface of the precast concrete member In addition, a relatively large, lightweight aggregate of low density is placed near the inner surface and fixed at an appropriate depth in the thickness direction, and durability, weather resistance, impact resistance, electromagnetic wave resistance near the outer surface A method for producing a precast concrete member, characterized in that it is a functionally graded member exhibiting moisture absorption, heat insulation and sound absorption near the inner surface. 4. A steel fiber reinforcement, a fine and high density aggregate, and a relatively large and light weight low density aggregate in a formwork having an appropriate shape to form a precast concrete member. After casting unhardened concrete mixed as an additive, by applying gravity or vibration or magnetic field such as centrifugal force, the steel fiber as a fine and high-density aggregate and magnetic material is used as a precast concrete member. Near the outer surface, a relatively large, lightweight, low-density aggregate is placed near the inner surface, fixed at the appropriate depth in the thickness direction, and durable, weatherproof, near the outer surface,
A method for producing a precast concrete member, characterized in that it is a functionally graded member exhibiting impact resistance and electromagnetic wave resistance and exhibiting moisture absorption, heat insulation and sound absorption near an inner surface.