JPH09317202A - Reinforcement structure of column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the reinforcement effect by the ring tension effect by surrounding the outer circumference of an existing column of rectangular section made of reinforced concrete by a steel tube of elliptical section, filling the filler inside thereof, and solidifying it to control expansion of the dimension of the column. SOLUTION: The outer circumference of a column 11 is surrounded by a steel tube 22 of elliptical section in order to reinforce the existing column 11 of rectangular section made of reinforced concrete, and mortar 14 is filled in a space between the column 11 and the steel tube 22 of elliptical section, and solidified. The steel tube 22 of elliptical section is split into a plurality of sections in the longitudinal direction, a joining part 23 is welded, a flange is provided on the joining part 23, and tightened by bolts and nuts. In a case of a flange, expansion of dimensions in the shorter axial direction is controlled by providing the flange in the longer axial direction of the ellipse. By using the steel tube 22 of elliptical section, dimensional expansion in the shorter axial direction caused by reinforcement is controlled, and the reinforcement effect is increased by the ring tension effect of the steel tube 22 of elliptical section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a reinforcing structure for reinforcing existing columns.

[0002]

2. Description of the Related Art A general reinforcement of an existing rectangular column having a reinforced concrete structure is carried out by surrounding the outer periphery of the existing column 1 with a steel pipe 2 having a rectangular cross section as shown in FIG. In this case, in order to increase the strength, it is often practiced to secure a space between the existing column 1 and the steel pipe 2 and fill the space with mortar.

By the way, the pillars used in a specific environment are
There are columns with flat cross-sections with different vertical and horizontal dimensions. There are many reasons why such a column cannot have a large cross-sectional dimension on the short dimension side.

When reinforcing a column having such a flat cross section,
As in a conventional general method, as shown in FIG. 6, a method of surrounding the outer circumference of an existing column 11 with a rectangular steel pipe 12 having the same shape, and, as shown in FIG. 7, a circular steel pipe 1 having a size capable of accommodating the existing column 11.
In some cases, the pillar 11 is surrounded by 3 and the mortar 14 is filled in the gap.

[0005]

However, when it is surrounded by the rectangular steel pipe 12 as shown in FIG. 6, an axial force acts on the column 11, and the column 11 is outwardly extended as shown by a chain double-dashed line in the figure. When trying to inflate, there is a problem that the ring tension of the steel pipe 12 that resists it is weak and therefore the reinforcing effect is low. Further, as shown in FIG. 7, when surrounded by the circular steel pipe 13, there is a problem that the cross-sectional dimension on the short side, which is not desired to be enlarged, is enlarged.

In view of the above circumstances, it is an object of the present invention to provide a column reinforcing structure capable of enhancing the reinforcing effect while suppressing the expansion of a desired dimension in one direction.

[0007]

The invention according to claim 1 is characterized in that the outer periphery of the column is surrounded by an elliptical steel pipe, and a filler is filled between the column and the steel pipe to solidify.

According to a second aspect of the present invention, in the first aspect, the elliptic steel pipes are divided into a plurality of pieces in the circumferential direction and are joined to each other while surrounding the outer circumference of the column.

According to a third aspect of the present invention, in the second aspect, a flange is provided on the major axis of the elliptical steel pipe, and the elliptic steel pipe divided into a plurality of parts by the flange is joined.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a horizontal sectional view of the first embodiment. In this embodiment, the outer circumference of an existing column 11 having a rectangular cross section (flat cross section) is surrounded by an elliptical steel pipe 22 that is long in the same direction, and the space between the column 11 and the elliptical steel pipe 22 is filled with mortar (filler) 14. ing. The elliptical steel pipe 22 is divided in half by the cutting line along the minor axis.
Are welded at the joint 23 in a state of being surrounded.

In the case of this structure, since the existing column 11 is surrounded by the elliptical steel pipe 22, the dimension expansion in the minor axis direction can be suppressed as much as possible. Further, since the ring tension effect of the steel pipe 22 can be expected, the mortar 14 and the column 11 can be tightened from the outer periphery by the ring tension, and the reinforcing effect can be enhanced.

The number of divisions and division positions can be set arbitrarily, and in the second embodiment shown in FIG. 2, it is divided into three.

As means for joining the divided pieces, a flange can be used instead of welding. FIG.
In the third embodiment, the split position is set on the short axis 25 of the elliptical steel pipe 22, the flange 24 is provided at that position, and the bolt is tightened. With this structure, the dimension in the minor axis direction, which is not desired to be enlarged, becomes large.
In the embodiment, the division position is set on the major axis 26, the flange 24 is provided at that position, and the bolt is tightened. In this case, since the flange 24 does not project in the short axis direction, the dimension expansion in the short axis direction can be suppressed as much as possible.

Of course, the present invention may be applied to other than existing columns.

[0015]

As described above, according to the first aspect of the invention, since the column is surrounded by the elliptical steel pipe, the dimension expansion in the minor axis direction can be suppressed as much as possible, and the ring of the elliptical steel pipe can be suppressed. Since the tension effect can be expected, the reinforcing effect can be enhanced.

According to the second aspect of the present invention, since the oval steel pipe is divided into a plurality of pieces, it is possible to easily attach the oval steel pipe to the periphery of the existing column.

According to the invention of claim 3, since the flange for joining the oval steel pipe divided into a plurality of pieces is arranged on the short axis, the oval steel pipe can be installed without welding while suppressing the dimensional expansion in the short axis direction as much as possible. It can be attached to the surrounding area and has good workability.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view of a second embodiment of the present invention.

FIG. 3 is a horizontal sectional view of a third embodiment of the present invention.

FIG. 4 is a horizontal sectional view of a fourth embodiment of the present invention.

FIG. 5 is a horizontal sectional view of a conventional reinforcing structure.

FIG. 6 is a horizontal sectional view of another conventional reinforcing structure.

FIG. 7 is a horizontal sectional view of still another conventional reinforcing structure.

[Explanation of Codes] 11 Column 14 Mortar 22 Elliptical Steel Pipe 23 Joint 24 Flange 26 Long Axis

Claims (3)

[Claims] 1. A reinforcing structure for a column, characterized in that the outer periphery of the column is surrounded by an elliptical steel pipe, and a filling material is filled between the column and the steel pipe and solidified. 2. The column reinforcing structure according to claim 1, wherein a plurality of the oval steel pipes are divided in the circumferential direction, and the elliptic steel pipes are joined to each other while surrounding the outer periphery of the column. 3. The column reinforcing structure according to claim 2, wherein a flange is provided on the major axis of the elliptical steel pipe, and an elliptic steel pipe divided by the flange is joined.