JPS58187305A - Manufacture of light aerated concrete with hollow section - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Lightweight aerated concrete is produced by adding water to a mixture of silicic raw materials such as sand, slag, and fly ash and calcareous raw materials such as cement and lime, and adding K, such as a foaming agent or foaming agent, to the mixture. Therefore, after foaming to a semi-plastic state, it is cured in an autoclave to produce a panel or block shape. When using this lightweight foam cleat, you can drill holes in the concrete body to expose internal reinforcing bars for its own installation, piping, single line, etc., or use bolt holes for installation. It is necessary to make holes for piping and wiring.

Conventionally, the method of drilling stones into this concrete body is
Tools such as a drill and a drill were used, but this method was extremely time-consuming and the tools were difficult to drill, making it impossible to drill a through stone in the center of a long panel. . There is also a method of inserting holes, etc., but in the former case, the formwork must be changed depending on the size and shape of the hole, which is inefficient and uneconomical. It has the disadvantage of being inefficient because it is cast into a convenient mold.

Furthermore, by enclosing a pressurized fluid, a rubber balloon-like object is inflated and used as a core, and when the concrete becomes semi-plastic, it is destroyed and contracted. There is a method such as forming a hollow part (Special Publication No. 740/1983), but this method is extremely difficult to change the shape, and also involves destroying the entire KI rudder-shaped turtle. This is not a very efficient method for removing things.

The object of the present invention is to eliminate the drawbacks listed in E and to provide a method for easily and efficiently coloring a lightweight matte Funkrete body by shading the hollow portion therein.

In order to achieve this objective, the present invention is aimed at manufacturing a lightweight one-cell Funkrete by placing a foamed thermoplastic resin molded into a desired shape in advance at a desired position V covered by the Funkret in the formwork.
Fill the concrete raw material reservoir with the foaming side in the formwork with Cv mouth and foam it, and the funkreet is made into green beans.
This book describes how to form holes of various shapes inside a concrete body by charging the molded body into an autoclave and melting and shrinking the molded body using high-temperature steam inside the autoclave.

As the foamed thermoplastic resin used as the core, foamed polystyrene or foamed urethane can be used. After pre-forming these resins into the desired shape, they can be tied to reinforcing reinforcing bars embedded in one concrete, or if one unit is an unreinforced pull, it can be identified using a repair bar set. and install it in the desired position. A concrete raw material mixed with a foaming material is poured into this, foamed, and after cutting, an autoclave treatment is performed. High temperature water inside the autoclave! As the foamed thermoplastic resin melts and shrinks, its volume decreases to about 1/100K, so a cavity with almost the same shape and dimensions as the core is created inside the Funkrete. It is formed. Examples will be described below.

Example 1: Made of styrofoam, thickness: 5 m, width: 10 m, length: 2
00 cores were fixed in a bottle and placed at a height of 303 from the lower end of the central part of the formwork, and a lightweight funkrete raw material mixture containing #Ii was poured into the formwork and foamed. I pulled out the bottle, which was now in a semi-plastic state, and 18
After 8 hours of autoclave curing at 0.011 m, the shape of the after-autoclave was evaluated, and it matched the dimensions of the polystyrene foam inserted as a core with an accuracy of within ±5X.

The melted Styrofoam adhered to the sides and bottom of the cavity, and no particular care was observed during use.

Example 2 A cylindrical core made of urethane foam and having a diameter of 5 cm and a length of 200 mm was fixed to a reinforcing steel bar, and the following Example 1. Autoclave curing was carried out in the same manner as above. When the dimensions and shape of the cavity were examined after autoclave curing, the dimensional accuracy was within ±51, and no curvature in the length direction was observed.

As described above, according to the present invention, a hollow portion having a desired shape can be formed at a desired position with high accuracy and extremely easily, so that the effect is great.

Patent applicant: Sumitomo Metal Mining Co., Ltd.

Claims (1)

[Claims] To manufacture lightweight foam concrete, a foamed thermoplastic t II previously formed into a desired shape is placed in a desired position covered with concrete in a formwork, and a foaming agent is concentrated in the formwork to form a concrete raw material reservoir. Manufacture of lightweight cellular Funcli-F having a hollow part characterized by filling and foaming material, curing with high-temperature and high-pressure steam, melting and shrinking the fermented and foamed thermoplastic resin, and forming pores inside the concrete body. Method.