JPH0938941A - Method for manufacturing steel pipe column coated with cement-based hardening material - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a coated steel tubular column with a good appearance that is easy and precise in a factory without post-construction on-site after the building column. [Structure] A through hole 2 communicating between the inside and the outside is formed in a plurality of portions of a covered portion of a steel pipe 1, and a reinforcing bar 3 is laid on the outer periphery of the covered portion. Then, the annular space corresponding to the coating thickness of the cement-based hardening material is maintained, the injection pipe 9 is inserted into the steel pipe 1 and the cement-based hardening material 10 such as concrete or mortar is injected from the tip thereof, and then centrifugal molding is performed. It is characterized in that the casting mold 6 is rotated, and the cement-based hardening material 10 is flowed and filled from the through hole 2 of the steel pipe 1 into the surrounding annular space by the action of centrifugal force and centrifugally molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a steel pipe column whose outer peripheral surface is coated with a cement-based hardening material such as concrete or mortar for fireproof coating, rust prevention and makeup.

[0002]

2. Description of the Related Art Conventionally, when a cement-based hardening material such as concrete or mortar is coated on the outer circumference of a steel pipe pillar, a method of spraying the cement-based hardening material on the outer circumference after the steel pipe pillar is built on site, and the circumference of the steel pipe. A method of assembling a mold and pouring a cement-based hardening material into the inside to form the frame, or a method of attaching a precast member to the outer circumference of the steel pipe column is adopted.

[0003]

The conventional spraying method has problems such as environmental pollution due to scattering of spraying material, restriction of use of mixed asbestos, and unevenness on the spraying surface.

Further, in the conventional method of molding a mold, a specialized operator for on-site assembly and disassembly of the mold is required, and molding defects such as cavities occur on the surface after demolding.
There are problems such as the need for repair.

Further, the method using a precast member has a problem in that it requires a lot of time and labor for the sticking work, and that the joint between the precast members is left and the appearance is not good.

[0006]

In order to solve the above-mentioned conventional problems, the present invention has through holes 2 communicating between the inside and the outside at a plurality of portions of a covered portion of a steel pipe 1, and a reinforcing bar 3 at the outer periphery of the covered portion. The steel pipe 1 is laid out and the coated portion of the steel pipe 1 is subjected to centrifugal molding form 6
It is placed inside and an annular space corresponding to the coating thickness of the cement-based hardening material is held around it, the injection pipe 9 is inserted into the steel pipe 1 and the cement-based hardening material 10 such as concrete or mortar is injected from the tip thereof. After that, the centrifugal molding form 6 is rotated, and the cement-based hardening material 10 is caused to flow into the surrounding annular space from the through hole 2 of the steel pipe 1 into the surrounding annular space by the action of the centrifugal force to perform centrifugal molding. A method of manufacturing a steel pipe column coated with a hardening material is proposed.

[0007]

Function: The injection pipe 9 is inserted into the steel pipe 1 having the through hole 2 in the covering portion.
After injecting the cement-based hardening material 10 such as concrete or mortar from the tip, the centrifugal molding form 6 is rotated, and the cement-based hardening material 10 is passed through the through hole 2 of the steel pipe 1 by the action of centrifugal force. Since it is infused into the surrounding annular space and filled by centrifugal molding, it can be integrally molded by factory production,
After construction, there is no need for post-construction work on the site after the building pillar, and the cement-based hardening material injected into the steel pipe by centrifugal molding is compactly filled from the through hole 2 into the annular space on the outer circumference of the steel pipe to make the surface dense. It is possible to obtain a coated steel pipe column with a good appearance and high earthquake resistance, and by applying an uneven pattern such as a wood grain pattern on the inner surface of the formwork, the surface of the coated cement-based hardening material is dense and aesthetic. It is possible to form a high pattern.

[0008]

EXAMPLE A through hole 2 communicating between the inside and the outside is formed in a plurality of portions of a coated portion of a steel pipe 1, and rebars 3 and gibber reinforcements 4 in the form of vertical and horizontal meshes are arranged on the outer periphery of the coated portion, and further the outer periphery of the coated portion. Install the spacer 5 at the required position.

The coated portion of the steel pipe 1 thus processed is placed in a centrifugal molding form 6, and a spacer 5 holds an annular space corresponding to the coating thickness of cement-based hardening material such as concrete or mortar, and the centrifugal The disk-shaped stigma plate 7 and the annular pedestal plate 8 are attached to the front and rear ends of the molding frame 6 to close the annular space.

The inner surface of the centrifugal molding frame 6 is provided with an uneven pattern such as a wood pattern if necessary.

Then, after inserting the injection pipe 9 into the steel pipe 1 and injecting the cement-based hardening material 10 such as concrete or mortar from the tip thereof, the centrifugal molding frame 6 is rotated by a rotary drive device to generate a centrifugal force. The cement-based hardening material 10 is caused to flow into and fill the surrounding annular space from the through hole 2 of the steel pipe 1 by the action of, and is further injected into the inner peripheral side of the steel pipe 1 to be centrifugally molded, and after the required curing, demolding is performed. Molding is performed to manufacture a coated steel pipe column in which the cement-based hardening material 10 is coated on the inner and outer peripheral surfaces of the steel pipe 1.

[0012]

As described above, according to the present invention, the injection pipe is inserted into the steel pipe having the through hole in the coating portion, and the cement-based hardening material such as concrete or mortar is injected from the tip thereof, and then centrifugal molding is performed. The mold is rotated, and the cement-based hardening material flows into and fills the surrounding annular space from the through hole of the steel pipe by the action of centrifugal force and is centrifugally molded. No need for post-construction work on the site after the building pillar, and the appearance that the cement-based hardening material injected into the steel pipe by centrifugal molding is compactly filled from the through hole to the annular space on the outer circumference of the steel pipe and the surface is densely finished. It is possible to obtain a coated steel pipe column with good appearance and high earthquake resistance, and by applying an uneven pattern such as a wood grain pattern on the inner surface of the formwork, the surface of the coated cement-based hardening material is dense and highly designable. It is possible to form the like.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a state before molding by a centrifugal molding frame device used in the present invention.

FIG. 2 is a vertical sectional side view showing a concrete pouring state of centrifugal molding according to the present invention.

FIG. 3 is a vertical sectional front view of a steel pipe column used in the present invention.

FIG. 4 is a vertical sectional side view of a coated steel pipe column formed according to the present invention.

[Explanation of Codes] 1 Steel Pipe 2 Through Hole 3 Reinforcing Bar 4 Gibel Bar 5 Spacer 6 Centrifugal Forming Form 7 Stigma Plate 8 Pillar Plate 9 Injection Pipe 10 Cement-based Hardening Material

Continuation of front page (72) Inventor Hisago Higuchi 1-14-29 Jingumae, Shibuya-ku, Tokyo

Claims (1)

[Claims] 1. A steel pipe is provided with through holes for communicating the inside and outside at a plurality of portions of a covering portion, and reinforcing bars are arranged on the outer periphery of the covering portion,
The coated portion of this steel pipe is put in a mold for centrifugal molding, and an annular space corresponding to the coating thickness of the cement-based hardening material is retained around it, and the injection pipe is inserted into the steel pipe and concrete or mortar is fed from its tip. After injecting the cement-based hardening material such as, the centrifugal molding form is rotated, and the cement-based hardening material flows into the surrounding annular space from the through hole of the steel pipe by the action of centrifugal force and centrifugally molded. A method of manufacturing a steel pipe column coated with a cement-based hardening material.