JPH07242458A - Production of concrete board with sound absorbing board - Google Patents

Abstract

PURPOSE:To easily produce a concrete board integrally bonded with sound absorbing boards. CONSTITUTION:The sound absorbing boards 4, 4 consisting of lightweight and porous concrete are laid within a form 1 for molding a concrete board and the respective joints are filled by a joint material 5. Water is then sprayed on the sound absorbing boards 4, 4 and absorbed therein and thereafter, arrangement of bars are arranged therein and ready mixed concrete 8 is placed in the form. The concrete is then molded by curing. The sound absorbing boards 4, 4 do not absorb the water of the ready mixed concrete 8 and, therefore, the sound absorbing boards 4, 4 and the concrete 8 are securely bonded and integrated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a concrete plate with a sound absorbing plate, in which a concrete plate and a porous sound absorbing plate are closely adhered and integrated.

[0002]

2. Description of the Related Art A porous sound absorbing plate has been installed in a building, an exterior, a soundproof wall or the like which needs sound absorption and sound insulation. In general, this sound absorbing board facility is generally constructed by adhering a pre-formed porous sound absorbing board to an already constructed concrete skeleton with an adhesive, or fixing the sound absorbing board with an anchor material and mortar. The method is adopted.

[0003]

However, in the above-described method of attaching the sound absorbing plate after the construction of the concrete skeleton, not only the insufficient adhesion due to the moisture of the concrete skeleton but also the scaffolding for construction is assembled. In addition to being necessary, there is a drawback that the surface of the sound absorbing plate is often uneven, which makes the construction difficult and increases the cost.

The present invention has been made to solve the above-mentioned conventional problems, and in view of the prefabrication of buildings, the concrete used as a substitute for the concrete skeleton or a part thereof. The purpose of the present invention is to make it possible to manufacture a product in which a sound absorbing plate is integrally bonded to a plate, eliminate the need to attach the sound absorbing plate at the site, simplify the construction, improve efficiency, and reduce costs.

[0005]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. The present invention is as follows: Laying a plurality of porous sound absorbing plates 4 and 4 side by side,
After filling the joints between the sound absorbing plates 4 and 4 with the joint material 5, water is applied to the sound absorbing plates 4 and 4 to give water, and then the bar 7 is arranged on the sound absorbing plates 4 and 4, and the concrete 8 It is characterized in that it is cast and cultivated.

The formwork used in the present invention is not particularly limited as long as it is a formwork suitable for forming a concrete plate.
It is not limited to the structure.

The sound absorbing plate is made of lightweight porous concrete having a bulk specific gravity of 0.2 to 0.4. Preferably,
It is composed of calcium silicate hydrate as a base material and has a diameter of
Small pores of about 0.1 to 1 mm are in communication with each other, and in addition to absorbing sound, it should have sound insulation and heat insulation properties. Also,
A sound absorbing plate having a thickness of 40 to 100 mm, preferably 50 to 70 mm is suitable. The planar shape of the sound absorbing plate is generally a quadrangle or a rectangle, but may be a triangle or a polygon as long as it is a shape suitable for forming common joints between them when laid out. Any shape can be used.

A plurality of the sound absorbing plates described above are laid out on the bottom plate of the mold, and joint materials such as hard mortar or gypsum plaster are buried in the joints between the sound absorbing plates, and the raw material is formed later. This will prevent the leakage of paste when pouring concrete.

After that, water is sprinkled on the sound absorbing plates that are lined up. This sprinkling is an important step in the present invention. That is, since the sound absorbing plate has a very small specific gravity of 0.2 to 0.4 and is porous, it absorbs a large amount of water, and when pouring fresh concrete, it absorbs the moisture of the concrete and inhibits the adhesion between the concrete and the sound absorbing plate. Therefore, an appropriate amount of water is applied to the sound absorbing plate in advance. The amount of water sprayed is 1000 to 2500 g, and preferably 1500 to 2000 g per 1 m ² of the sound absorbing plate.

After water is sprinkled, green bars are placed above the sound absorbing plate to pour green concrete to a desired thickness. At that time, the concrete can be compacted by applying vibration to the formwork. Then, curing is performed to cure the concrete, and then the mold is removed. As a result, it is possible to manufacture a concrete plate with a sound absorbing plate in which the sound absorbing plate and the concrete are integrally and firmly joined. The above curing may be natural curing,
Normal temperature and atmospheric pressure steam curing may be performed. The concrete plate with the sound absorbing plate manufactured as described above may be carried into the site and built therein.

[0011]

The present invention is configured as described above. Since the concrete is placed after water is applied to the sound absorbing plate by sprinkling water, the sound absorbing plate must absorb the moisture of the fresh concrete. Therefore, the sound absorbing plate and the concrete can be firmly bonded to each other without adding any attachment means such as an adhesive.

[0012]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a general box-shaped mold used for molding a concrete plate, which has a structure in which a bottom plate 2 and a side frame plate 3 are separably coupled.

First, a plurality of sound absorbing plates 4 and 4 are laid on the bottom plate 2 in the form 1, and the joint material 5 of gypsum plaster is filled in the joints between the sound absorbing plates to fill the joints. To do. The sound absorbing plate 4 is a lightweight porous concrete plate having a thickness of 50 mm and a bulk specific gravity of 0.3 (pore cell: manufactured by Daido Concrete Industry Co., Ltd.).
It was used.

Next, water is sprinkled on the surfaces of the sound absorbing plates 4 and 4, so that the sound absorbing plates absorb water. The relationship between the amount of water sprayed and the adhesion strength between the sound absorbing plate and concrete is as shown in the following table.

Water sprinkling amount (g / m ² ) 0 1000 1500 2000 2500 Adhesion strength (kgf / cm ² ) 1.35 1.50 1.95 1.70 1.40

According to the above table, the sprinkling amount is 1 m ^{2 of} sound absorbing plate.
It is recognized that a larger adhesion strength is exhibited when the amount is 1500 to 2000 g per unit.

After water sprinkling, a plurality of support nails 6 and 6 are erected on the sound absorbing plates 4 and 4 and are connected to the upper ends of the sound absorbing plates 4 and 4.
Reinforcing bars 7 are provided in a slightly distant upward direction, raw concrete 8 is placed on the sound absorbing plates 4 and 4, and the reinforcing bars 7 are embedded in the concrete 8. The bar arrangement 7 can also be arranged by using a spacer or the like. Then, if the upper surface of the cast concrete 8 is leveled and then cured, and then the mold is removed after the concrete is hardened, the sound absorbing plates 4, 4 as shown in FIG. 3 are obtained.
Thus, the concrete plate with the sound absorbing plate in which the concrete 8 and the concrete 8 are combined and integrated is manufactured.

[0018]

As described above, according to the present invention,
Since the sound absorbing board was laid out in the formwork, water was sprinkled to absorb the moisture into the sound absorbing board, and then the fresh concrete was placed to integrally bond the sound absorbing board and the concrete. It is possible to manufacture a concrete plate that is extremely simple and easy and has a large sound absorbing plate adhesion strength. As a result, unlike the conventional case, the work of attaching the sound absorbing plate on the site is not required, and it is not necessary to assemble a scaffold for that purpose, the site construction is facilitated, and the cost can be drastically reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a manufacturing process according to an embodiment of the present invention, in which sound absorbing plates are laid side by side in a mold.

FIG. 2 is a vertical cross-sectional view of placing the same concrete.

FIG. 3 is a perspective view showing an example of a manufactured concrete board with a sound absorbing board.

[Explanation of symbols]

 1 Formwork 4 Sound absorption board 5 Joint material 7 Bar arrangement 8 Concrete

Claims (1)

[Claims] Place a plurality of porous sound absorbing plates in a concrete plate forming frame, fill the joints between the sound absorbing plates with joint material, and sprinkle water on the sound absorbing plates to add moisture, and then on the sound absorbing plates. A method for producing a concrete plate with a sound absorbing plate, which comprises arranging reinforcing bars on the ground, pouring fresh concrete to form a cured product.