JP3098565B2 - Composite pillar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column typified by a steel tube concrete column. More specifically, the present invention relates to a column filled with concrete in a metal tube and centrifugally forming the metal tube around its axis by centrifugal molding. And a composite column that forms a concrete body with the concrete compacted.

[0002]

2. Description of the Related Art In a composite column of this kind, since a concrete body is compacted by centrifugal force, the strength of the concrete body can be increased by a simple centrifugal molding operation such as filling concrete into a metal tube and rotating the metal tube. Without embedding reinforcing steel in the concrete body, or applying prestress to the concrete body via a steel wire or a steel rod, the strength of the concrete body can be easily increased. There are advantages. However, since the concrete body is subjected to centrifugal molding, it is inevitable that the concrete body becomes a cylindrical body having a hollow portion at the center. Therefore, in the case of a conventional composite column, for example, a steel pipe concrete column, if there is a cavity in the center of the concrete body, the effect of restraining the concrete body against the collapse of the concrete body into the cavity when an axial pressure is applied is effective. The mortar was filled in the hollow portion of the concrete body to increase the resistance against collapse into the hollow portion, and a predetermined strength against axial pressure was obtained.

In the above-described conventional composite column, a horizontal metal tube is filled with concrete, the metal tube is rotated, and the metal tube is compacted by the centrifugal force to increase the strength of the concrete body. After curing the concrete body after molding, and after curing and curing, it was necessary to fill the mortar into the central cavity of the concrete body remaining formed by centrifugal molding to obtain a predetermined strength with respect to the axial pressure,
The formation of the composite pillar was troublesome. Accordingly, an object of the present invention is to solve the above-mentioned problems and to efficiently provide a composite column such as a steel pipe concrete column maintaining a predetermined strength equivalent to the conventional one without any trouble.

[0003]

[Means for Solving the Problems]

[Structure] The characteristic structure of the invention according to claim 1 is that the concrete body is compacted in the metal tube by centrifugal molding in which the metal tube is filled with concrete and the metal tube is rotated around its axis. A composite pillar that forms
A hollow portion is formed at the center of the concrete body, and an innermost layer of the concrete body facing the hollow portion is formed.
A certain centrifugal force at which is formed the most high strength reinforced concrete part with the large than others.

[Operation and Effect] According to the first aspect of the present invention, a hollow portion is formed in the center of the concrete body, and the innermost layer of the concrete body facing the hollow portion has a larger centrifugal force than the others. To
Since is formed on the highest strength reinforced concrete unit,
A composite column having a predetermined strength against an axial pressure can be obtained without filling the mortar into the cavity . That is,
Centrifugal force in forming other parts by centrifugal force due to centrifugal molding
And large on is for work than concrete body facing the cavity
Of the innermost layer of concrete is strengthened to form a reinforced concrete part
As a result , the reinforced concrete part exerts the restraining effect of the concrete body against the collapse of the concrete body into the hollow part when the axial pressure is applied, and the axial compressive strength can be increased. The same predetermined strength can be maintained. And the formation of the reinforced concrete part can be carried out in a series of centrifugal molding steps,
For example, after centrifugal molding, as compared to fill the mortar into the cavity in a separate step, Tokoro for very efficiently axial pressure
A composite column having constant strength can be formed. As a result, a composite column such as a steel pipe concrete column having a predetermined strength can be efficiently formed in the same process using the same equipment without any trouble. Further, the remaining hollow portion can be used, for example, for passing wiring or piping, or as a gutter, or the heat resistance of the column can be improved by passing a cooling fluid.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A steel pipe concrete column, which is an example of a composite column,
As shown in FIGS. 1 and 2, a steel pipe 1 which is an example of a metal pipe
And a concrete body 2 filled therein. The concrete body 2 is a high-strength concrete body in which unhardened concrete is filled in a steel pipe 1 and the steel pipe 1 is rotated around its axis X and compacted by centrifugal force. In the center of the steel pipe concrete column, a cavity 3 formed by compacting by the above-mentioned centrifugal force, that is, by forming the concrete body 2 into a cylindrical shape by centrifugal molding is left as it is. Since the centrifugal molding of the concrete body 2 is well known, a detailed description thereof will be omitted. The concrete column is usually 2
In the case where a column having a length of up to three floors is formed and a column higher than that is constructed, a plurality of columns are joined up and down. As an example of the connection structure, as shown in FIG.
The upper end of the steel pipe 1 in the lower steel pipe concrete column and the lower end of the steel pipe 1 in the upper steel pipe concrete column are joined by welding, and between the upper end face of the lower concrete body 2 and the lower end face of the upper concrete body 2 Mortar (preferably high strength mortar) 4. 5
In order to prevent the filled mortar 4 from entering the hollow portion 3, the lower end portion is inserted into the upper end portion of the hollow portion 3 of the lower steel pipe concrete column, and the upper end portion is inserted into the hollow portion of the upper steel pipe concrete column. It is a sheath tube inserted into the lower end of the part 3, and this also acts as one of the temporary fixings of the upper and lower steel pipe concrete columns until the upper and lower steel pipes 1 are welded to each other. Reference numeral 6 denotes a mortar filling hole, and reference numeral 7 denotes an exhaust hole for discharging air inside according to the mortar filling.

[0006] Reinforcement that exerts an effect of restraining the concrete body 2 against collapse of the concrete body 2 into the cavity 3 when an axial pressure is applied to the inner peripheral portion of the concrete body 2 facing the cavity 3 The concrete part 10 is formed. In general, in the centrifugal molding of the concrete body 2, the reinforced concrete portion 10 is not formed by a centrifugal molding with a predetermined thickness at a time, but as shown in FIG. .. An and a method of sequentially forming them from the outer layer A1. Focusing on this point, in the above embodiment of the present invention, the centrifugal force applied in forming the innermost layer An is set to be larger than the others, and the innermost layer An is formed.
Is formed by making the most strong.

Hereinafter, an improved embodiment of the present invention will be described. In the above embodiment, as shown in FIGS. 5 and 6, a reinforcing member 8 for restraining the concrete body 2 is provided on the inner peripheral portion of the concrete body 2. As shown in FIG. 1, the reinforcing body 8 is installed on the end face form B attached to the steel pipe 1 so as to prevent the unhardened concrete from leaking from the steel pipe 1. Is carried out by centrifugally forming the concrete body 2 in a state in which is attached. As a result, the reinforced concrete portion 10 is formed in which the reinforcing bars 8A are embedded in the concrete body 2 in a state where the concrete is compacted and the integrity with the compacted concrete is increased. The reinforcing member 8 shown in FIG. 5 is provided with a reinforcing bar 8A composed of a plurality of hoop bars 8a juxtaposed at intervals in the axial direction and a bar 8b connecting them, as shown in FIG. 1 shows a reinforcing member 8 in which a spiral reinforcing bar 8B is embedded in the concrete body 2 to form a reinforcing concrete portion 10.

[0008] In the claims, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view

FIG. 2 is a cross-sectional view

FIG. 3 is a longitudinal sectional view

FIG. 4 is a cross-sectional view

FIG. 5 is a cross-sectional view

FIG. 6 is a longitudinal sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal pipe 2 Concrete body 3 Hollow part 8,9 Reinforcement body 10 Reinforced concrete part

Continuation of front page (72) Inventor Kenji Handa 3-4-1-10 Honcho, Chuo-ku, Osaka-shi, Osaka Japan Concrete Industry Co., Ltd. Osaka office (56) References JP-A-1-130910 (JP, A) JP-A-56-38209 (JP, A) JP-A-63-9508 (JP, A) JP-A-2-209204 (JP, A) JP-A-1-61317 (JP, U) (58) Fields studied (Int .Cl. ⁷ , DB name) E04C 3/00-3/46 B28B 21/00-23/22

Claims (1)

(57) [Claims] 1. A state in which concrete is filled in a metal tube (1) and the concrete is compacted in the metal tube (1) by centrifugal molding in which the metal tube (1) is rotated around its axis. A composite column for forming a concrete body (2) by forming a hollow part (3) in the center of the concrete body (2), and the concrete body (2) facing the hollow part (3). The innermost layer (An) of
And heart force larger than the other highest strength reinforced concrete section (10) to form a composite pillars are.