JPH0149603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a concrete pipe whose inner wall surface is coated with a heated and fused layer of glaze.

By coating the inner wall of a concrete pipe with a layer of heated molten glaze, you can obtain a concrete pipe that is highly corrosion resistant and is particularly suitable for use as a sewer pipe.However, ordinary concrete is susceptible to high heat, and if it contains reinforcing steel, it will resist heat. Because the tube is elongated, the heat generated during the porcelain coating often damages the tube itself, making it difficult to make a concrete tube with a porcelain interior.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a new method by which an inner porcelain concrete pipe can be easily manufactured without causing damage due to heat.

A feature of the present invention is that an unreinforced concrete pipe is manufactured using fireproof concrete using alumina cement, and after a heated molten layer of glaze is formed on the inner wall surface, the outside is made of ordinary reinforced concrete. It is at the point where it is covered with.

The present invention will be explained in more detail below.

In the present invention, first, an unreinforced concrete pipe is manufactured from fire-resistant concrete using alumina cement, and a fire-resistant aggregate such as Shamotsu is used as the aggregate. Further, although this concrete pipe can be made using centrifugal force like a Huyum pipe, it is not necessarily limited to this.

Next, a low-melting glaze, which is similar to that used in ceramics and melts at a relatively low temperature of about 600 to 700 degrees Celsius, is sprayed uniformly onto the inner wall of the concrete pipe. Alternatively, after it has dried, a heat source is inserted into the tube, and while the tube is rotated, the glaze layer is heated to about 700°C and melted in a short time, forming a heated and molten layer of glaze on the inner wall surface.

Next, this concrete pipe is used as an inner mold, reinforcing bars are inserted between this and the outer mold, and concrete is filled, and the outside of the concrete pipe is wrapped with reinforced concrete. This outer concrete is made of ordinary cement and aggregate, and is made of slump O.
It is preferable to knead the material to a certain degree of carbide and then apply vibration or the like to form the material.

According to the present invention, for example, the product shown in the figure is obtained. In the figure, 1 is the inner concrete pipe manufactured first, 2 is the heated molten layer of glaze formed on the inner wall surface of the concrete pipe 1, and 3 is the concrete pipe. 4 is the reinforcing steel buried in the covering concrete 3, 5 is the covering concrete 3
It is a pedestal that is integrally formed with the pedestal.

As is clear from the above description, in the present invention,
First, an unreinforced concrete pipe is made from fireproof concrete using alumina cement, and a heated molten layer of glaze is formed on the inner wall surface, and then the outside is covered with ordinary concrete with reinforcing steel. The tube body is not damaged by the heat generated when a heated molten layer of glaze is formed on the wall surface, and an inner-porcelain concrete tube without any problems in terms of strength can be easily manufactured.

[Brief explanation of drawings]

The drawing is a cross-sectional view of an example of a double-walled internally porcelain concrete pipe manufactured according to the present invention. 1: Concrete pipe, 2: Heat-melted layer of glaze,
3: Covered concrete, 4: Reinforced steel, 5: Pedestal.

Claims (1)

[Claims] 1. A double-walled concrete pipe characterized by manufacturing an unreinforced concrete pipe with fireproof concrete using alumina cement, forming a heated molten layer of glaze on the inner wall surface, and then covering the outside with ordinary concrete containing reinforcing steel. A method for manufacturing a structural internally porcelain concrete pipe.