JPH01210312A - Manufacture of glossy concrete column - Google Patents

Abstract

PURPOSE:To make it possible to manufacture a concrete column having a gloss over the whole outer peripheral surface by a method wherein mixed mortar consisting of aggregate, cement, chemical cement admixture and water is filled in a circular tubular mold, the inner surface of which is smooth, and, after that, cured while the mold is rotated. CONSTITUTION:At first, mixed mortar is prepared by mixing aggregate, cement, chemical cement admixture and water. Further, an outer mold 3 formed by uniting bisected molds 1A and 2B, the inner surfaces of which is machines in smooth surface, and a hemispherial core 4, the inner surface of which is machined din smooth surface, are set on the table 1 of a vibrating machine. Next, said mixed mortar is filled on the core 4 so as to form a hemisphere. After that, the filled mortar is deaerated by vibrating the table 1 through the actuation of the vibrating machine. The whole mold is dismounted from the table 1 and then fixed on a rotating table 5. After dewatering pipe 6 is arranged at the center of the outer mold 3, the mixed mortar is filled in the space made between the inner surface of the outer mold 3 and the pipe 6. Next, the mixed mortar is cured while the rotating table 5 is rotated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a glossy concrete cylindrical body used for building materials such as shelf pillars for car stops installed at entrances to parks and promenades, and interior columns for buildings. Regarding the manufacturing method.

[Prior art] As a method for producing a concrete molded product with gloss,
As shown in Japanese Unexamined Patent Publication No. 53-11917, there is a known method for manufacturing concrete plates in which a cement admixture is mixed with cement mortar, and the mixture is placed in a flat mold with a smooth inner surface and hardened. ing.

[Problems to be Solved by the Invention] When a three-dimensional concrete molded product (for example, a concrete cylinder) is made using the above method, a slight gloss is produced only at the bottom part of the mold, and a gloss is produced at the upper part. The disadvantage is that it cannot be done.

[Means for Solving the Problem] The present invention has been made to solve the above-mentioned drawbacks, and has the following features:
This was developed with the aim of providing a method for manufacturing concrete cylinders with gloss on the entire outer circumferential surface, in which aggregate, cement, cement admixture, and water are placed in a cylindrical mold with a smooth inner surface. After filling the kneaded mortar, the kneaded mortar is hardened without rotating the mold.

[Example] Hereinafter, the manufacturing process of the concrete cylindrical body of the present invention will be explained. Prepare mortar by mixing aggregate, cement, cement admixture, and water. Also, as shown in Fig. 1, on the vibrator table 1, there is a two-part mold 2 whose inner surface is processed to have a smooth surface.
An outer mold 3 formed by combining A and 2B and a hemispherical core mold 4 whose inner surface is smoothed are set. Next, the kneaded mortar is filled onto the core mold 4 so as to form a hemisphere. Then, a vibrator (not shown) is activated to remove the table 1.
Vibrate to remove air bubbles from the filled mortar. The entire mold is removed from the table 1 and then fixed onto the rotary table 5 as shown in FIG. Thereafter, the space between the inner surface of the outer mold 4 and the water draining vibro is filled with the kneading mortar. Next, turn the rotary table 5 to 100~200R.
The kneaded mortar is hardened while rotating at PM level.
Due to the rotation of the table 5, unnecessary water in the mortar comes out into the vibro through the holes 6A of the vibro together with the air bubbles contained in the mortar.

This water is removed by suction using a vacuum device (not shown). During this rotational hardening, the cement with the highest specific gravity in the mixed mortar, especially the cement that has undergone a hydration reaction with the cement admixture, is maintained on the entire inner peripheral surface of the mold by the centrifugal force effect of the rotation, so after hardening, it can be released from the mold. The resulting cylindrical body has a tile-like luster on its entire outer peripheral surface. In the above example, the two divided molds are combined to form a cylindrical mold (
This is for convenience of mold release, and in the case of a tapered mold, it is not necessary to use a split mold. Also, a hemispherical core mold is used to make a cylindrical body with an integrally formed head, but it is also possible to make a cylindrical body with both ends cut off without using a hemispherical core mold. You may also do so. Further, in the above embodiment, the outer mold filled with mortar is rotated while standing upright, but after filling with mortar, the outer mold may be laid down and hardened while being rotated in a horizontal state.

[Effects of the Invention] According to the method for manufacturing a concrete cylinder of the present invention, it is possible to generate a tile-like gloss on the entire outer peripheral surface of the concrete cylinder, although it is an extremely easy method that only requires curing in a mold. It has a huge industrial effect, allowing the mass production of superior building materials with high added value.

[Brief explanation of the drawing]

1 and 3 are diagrams showing the manufacturing process of the concrete cylindrical body of the present invention, and FIG. 2 is a plan cross-sectional view taken along the line ■ in FIG. 1. 3...Outer mold 5...Rotary table Fig. 2 Fig. 1 Pa "°\"1-111 "1-1111-Beai 4-Wish Fig. 3 00LL+) o O shoulder 1 0. 1 □1 Karito (--war)

Claims (1)

[Claims] A cylindrical mold with a smooth inner surface is filled with a kneaded mortar consisting of aggregate, cement, a cement admixture, and water, and then the kneaded mortar is hardened while rotating the mold. A method for producing a shiny concrete cylinder.