JPH0449002A - Manufacture of concrete panel - Google Patents

Abstract

PURPOSE:To obtain a concrete panel, which is not shrunk nor cracked, by placing concrete slurry containing a reinforcing member deformed in three dimensions into forms for molding and sinking the reinforcing member to a bottom. CONSTITUTION:A concrete raw material such as Portland cement, silica sand, etc. and air and a plurality of coil-shaped stainless materials 2 as three- dimensional-shaped reinforcing members are mixed into a mixer 1, and agitated, thus manufacturing concrete slurry 4. Concrete slurry 4 is placed in forms 5 for molding, and left at stand until the stainless materials 2 sink on the bottom of the forms 5 by gravity. Approximately the whole coin-shaped stainless materials 2 dispersed in slurry 4 are collected to the lower layer of concrete slurry 4. Slurry 4 is solidified and form-removed, and a molded panel is cured at a high temperature and high pressure in saturated steam.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a concrete panel, and can be used, for example, to manufacture lightweight cellular concrete panels for unit housing.

[Background Technology J] In recent years, prefabricated housing units have been constructed in which living rooms, which are the constituent parts of a house, are manufactured as housing units in a factory, and these housing units are transported to a site and assembled. Lightweight aerated concrete panels are used for wall panels in such unit homes. This lightweight aerated concrete panel is made of cement and silica sand as the main raw materials, and a concrete slurry mixed with air bubbles is poured into a forming formwork in which reinforcing material is placed, and then hardened. Manufactured by steam curing in a high temperature, high pressure autoclave. After manufacturing, the surface of the panel is painted.

[Problem to be solved by the invention] According to the above-mentioned conventional lightweight aerated concrete panel,
Over the years, changes in external factors such as temperature and humidity have caused the surface of the panel to deteriorate, causing shrinkage and cracking.

The present invention (1. The surface is reinforced to prevent shrinkage and cracking.
The purpose of the present invention is to provide a method for manufacturing concrete panels that does not result in reinforcing members that may be made of magnetic material or formed of magnetic material, and that are intended to be forced to settle by magnetic force. But that's fine.

[Means for Solving the Problems] A method for manufacturing a concrete panel according to the present invention includes a step of stirring a concrete raw material containing a three-dimensionally deformed reinforcing member to produce a concrete slurry, and a step of forming the concrete slurry. The present invention is characterized by comprising the steps of: pouring the reinforcing member in the concrete slurry into a mold; and settling the reinforcing member in the concrete slurry to the bottom of the mold.

The three-dimensionally deformed reinforcing member is, for example, a wire-like member deformed into a coil shape. The material for this reinforcing member may be arbitrary, or preferably stainless steel, copper, carbon fiber, glass fiber, ceramic, etc., which can withstand autoclaving and has a specific gravity greater than that of the slurry.

When settling the reinforcing members, the reinforcing members are simply deposited at the bottom of the forming form by gravity over time. [Function] When making concrete slurry, reinforcing members that have been three-dimensionally deformed are also included in the concrete raw material. By stirring them together, the concrete raw material and the reinforcing member become compatible (compatibility).

In addition, by allowing the reinforcing members in the concrete slurry to settle to the bottom of the forming formwork, the reinforcing members gather on the surface of the concrete panel, and these three-dimensionally shaped reinforcing members reinforce the surface of the panel and cause shrinkage. This will help prevent cracks.

[Example] An example in which the present invention is applied to manufacturing a lightweight cellular concrete panel will be described with reference to the drawings.

First, as shown in FIG. 1(A), concrete raw materials such as Portland cement and silica sand, air, and a plurality of coiled stainless steel materials 2, which are three-dimensional reinforcing members, are mixed and put into a mixer 1 and stirred. These are stirred by a screw 3 to prepare a concrete slurry 4. By this stirring, the plurality of coiled stainless steel materials 2 are uniformly dispersed in the concrete slurry 4.

Next, as shown in FIG. 1(B), the stirred concrete slurry 4 is poured into a forming form 5 in which reinforcing materials (not shown) are arranged. A plurality of coiled stainless steel materials 2 are uniformly dispersed in the concrete slurry 4 immediately after pouring.

Next, as shown in FIG. 1(C), the concrete slurry 4 in the formwork 5 is left until the coiled stainless steel material 2 in the concrete slurry 4 settles to the bottom of the forming formwork 5 due to gravity. As a result, substantially all of the coiled stainless steel material 2 dispersed in the concrete slurry 4 gathers in the lower layer of the concrete slurry 4.

After the slurry 4 has solidified, it is demolded in the conventional manner, and the molded panel is then transported to an autocreep (not shown) and heated in saturated steam at a high temperature (e.g., 180°C) and under a high pressure (e.g., 10 kg). By curing for about an hour,
A lightweight aerated concrete panel 6 shown in FIG. 2 is obtained. After this, paint 7 is applied to the surface.

When this panel 6 is used, for example, as a wall panel of a housing unit, it is used as a frame of the housing unit with the surface in which the coiled stainless steel material 2 is embedded facing outward.

According to this embodiment, the coiled stainless steel materials 2 in the concrete slurry 4 are sedimented and gathered densely at the bottom of the molding form 5, and these coiled stainless steel materials 2 have a three-dimensional shape. Lightweight aerated concrete panel 6 reinforced in the thickness direction or three-dimensionally on the surface of the panel
or can be obtained.

Therefore, when these panels 6 are installed as wall panels of a unit house, the three-dimensional reinforcing effect of the coiled stainless steel material 2 can prevent the panels 6 from shrinking or cracking.

In addition, in this embodiment, when producing the concrete slurry 4, the coiled stainless steel material 2 is stirred together with concrete raw materials such as Portland cement in the mixer 1, so that the stainless steel material 2 is placed at the bottom of the molding form 5. Compared to the case where the concrete slurry 4 is placed first and the concrete slurry 4 is then poured, the effect that the concrete and the coiled stainless steel material 2 are better acquainted can be obtained. This is more preferable in terms of preventing shrinkage and cracking of the panel 6.

In addition, since the coiled stainless steel material 2 with a high specific gravity is used as the three-dimensionally deformed reinforcing member, the settling speed to the bottom of the molding frame 5 is increased, and manufacturing efficiency is improved.

Further, since the coiled stainless steel material 2 is provided only on the surface portion of the panel 6 necessary for reinforcement, the number of stainless steel material 2 required is not so large.

Therefore, the coiled stainless steel material 2 does not increase the panel cost so much, and the reinforcing panel 6 can be provided at low cost.

In this example, the coiled stainless steel material 2 was used as the three-dimensionally deformed reinforcing member, but the slurry 4
Any other member made of steel, carbon fiber, glass fiber, ceramic, etc. may be used as long as it can maintain its three-dimensional shape even after the stirring and settling steps.

In addition, when a magnetic material such as magnetic stainless steel material is used as a reinforcing member, an electromagnet, for example, is placed on the bottom surface of the molding frame 5 during the settling process to the bottom of the molding frame 5. The magnetic stainless steel may be forcibly settled to the bottom of the formwork 5 by magnetic force. By doing so, the settling speed of the stainless steel material can be increased.

Further, in this embodiment, the three-dimensionally deformed shape of the stainless steel material 2 is a coil shape, but other shapes such as a spiral shape, a random shape, etc. are arbitrary.

[Effect of the invention] According to the method for manufacturing a concrete panel according to the present invention,
The reinforced surface results in concrete panels that do not shrink or crack over long periods of time.

Figure 1

[Brief explanation of the drawing]

FIGS. 1(A) to (C) are process diagrams showing a method for manufacturing a lightweight cellular concrete panel according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a lightweight cellular concrete panel produced according to this embodiment. . l... Mixer 2... Coiled stainless steel material as a reinforcing member, 4... Concrete slurry, 5...
Formwork for forming, 6...Lightweight aerated concrete panel. (B) Applicant: Misawa Homes Co., Ltd.

Claims (1)

[Claims] (1) A step of stirring a concrete raw material containing three-dimensionally deformed reinforcing members to produce concrete slurry, a step of pouring the concrete slurry into a forming form, and reinforcement in the concrete slurry. A method for producing a concrete panel, comprising the step of settling the member at the bottom of the forming form.