JPH0552000A - Partial lining type concrete column - Google Patents

Abstract

PURPOSE:To obtain a lightweight steel pipe concrete column capable of easily manufacturing even if it is long as one column, to promote the unification of an outside steel pipe to an inside concrete and to obtain column structure having high strength. CONSTITUTION:Stiffeners 3a-3d projected from the circumferential surface to the center side are provided to required points in a steel pipe 1. Concretes 4 are partially lined in a plurality of areas in the steel pipe 1 with the stiffenfibers 3a-3d as the boundary by centrifugal force molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe concrete column for a building structure, and more particularly to a partially lined type steel pipe concrete column in which the inner surface of a steel pipe is partially lined with concrete.

[0002]

2. Description of the Related Art Typical examples of a steel pipe concrete column structure are a filling type in which a steel pipe built in a site is filled with concrete and a lining type in which the inner surface of the steel pipe is lined with concrete by centrifugal force forming. The lining type steel pipe concrete columns are usually built in the site and then filled with concrete.

In the steel pipe concrete column structure, the concrete inside and the steel pipe outside restrain each other, so that the advantage of the steel pipe that is strong in tensile force and the concrete advantage that it is strong in compressive force are synergistically utilized. As a result, the bending strength is very large, there is several times the stress elongation from the permissible bending moment to the fracture, it has very great toughness, and it has excellent features such as local buckling is hard to occur. It has a different structure.

In order to exert the above characteristics of the steel pipe concrete column structure, the outer steel pipe and the inner concrete are surely integrated, and the force transmitted from the beam to the steel pipe is surely transmitted to the concrete inside the steel pipe. It is important to. Therefore, in the filling type steel pipe concrete column structure, a reinforcing member called a stiffener is previously provided inside the steel pipe at the connecting position with the beam. The stiffener is also called an inner flange, and is made of a steel plate protruding from the inner peripheral surface of the steel pipe toward the center side. After the concrete is filled, the stiffener is embedded in a concrete column. The beam is coupled to the outside of the steel pipe to which the stiffener is attached, whereby the force transmitted from the beam to the steel pipe is surely transmitted to the concrete inside through the stiffener to enhance the integrity of the steel pipe and the concrete.

Further, in the lining type steel pipe concrete column, very high density concrete is integrated with the inner surface of the steel pipe by centrifugal force forming.

[0006]

In the structure in which the steel pipe having the stiffener inside is filled with concrete as described above, there is a problem that voids are easily generated in the lower surface of the stiffener. In other words, since the stiffener projects like a flange on the inner peripheral surface of the steel pipe, the cast concrete flows through the opening in the center of the stiffener, but the concrete does not reach the area directly below the stiffener and there is no concrete. Air or breathing water may remain in the area. If there is a void that is not filled with concrete in the area directly below the stiffener, the intended purpose of reliably transmitting the force applied from the beam to the steel pipe to the concrete by the stiffener will not be achieved,
The integrity of the steel pipe and concrete is impaired, and there arises a problem with the reliability of the excellent column structure.

On the other hand, JP-A-1-295957 (E)
04C 3/293) etc., in the conventional lining type steel pipe concrete column structure, concrete is lined over almost the entire length of the steel pipe. Lining concrete over the entire length of a long steel pipe by centrifugal force molding requires a very large centrifugal force forming device, and the weight of the product after lining becomes very large, which hinders transportation and installation work. Come to Therefore, the conventional lining type steel pipe concrete column has a relatively short length. Therefore, there are many joints when steel pipe concrete columns are added and built at the site, and there is a problem in terms of workability in building and strength after building.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to easily manufacture even if the length of one piece is sufficiently long, to prevent the product weight from becoming excessive, and to make it large after construction. The purpose of this is to effectively reinforce the connection with the beam to which force is applied so that the excellent characteristics of the steel pipe concrete structure can be easily realized.

[0009]

Therefore, in the present invention, stiffeners projecting from the inner peripheral surface toward the center are provided at the required points in the steel pipe, and centrifugal force forming is performed in a plurality of regions inside the steel pipe with these stiffeners as boundaries. Lining concrete with,
A non-lining area was set between the lining area and the lining area.

[0010]

In the steel pipe concrete pillar according to the present invention, the concrete is not lined over the entire length thereof, but the concrete is partially lined at predetermined points set in advance, and the other parts are made of concrete. Is not lined. The position where the concrete is locally lined is set according to the structurally important parts such as the connection part with the beam, the panel zone, and the hinge forming part. The high-density concrete lined by centrifugal molding and the stiffener are extremely tightly bonded, and the strength of the portion to which a large force is applied after construction is extremely high.

[0011]

1 and 2 show a state in which a steel pipe concrete column according to an embodiment of the present invention is built in a site.
A steel pipe 1 which is a pillar member of this embodiment has a substantially square cross section, and a steel beam 2 combined with the steel pipe 1 is made of H-shaped steel. The steel pipe 1 is erected vertically, the steel beam 2 is provided at intervals of several meters or more, and at the intersection of the steel pipe 1 and the steel beam 2, the beam 2 is joined to the outer periphery of the steel pipe 1 by means such as bolting or welding. To be done.

The steel pipe 1 is sufficiently long and is connected to the beam 2 having a plurality of heights by one pipe. The four stiffeners 3a, 3a are provided in the connection portion with one steel beam 2 inside the steel pipe 1.
b, 3c and 3d are attached at a predetermined interval. The stiffeners 3a and 3d are frame-shaped members in which a circular opening is provided at the center of a square steel plate that fits inside the steel pipe 1. The stiffeners 3a and 3d are installed so as to project horizontally from the inner surface of the steel pipe 1 toward the center. It is fixed to 1 by welding.

As shown in FIG. 1, four stiffeners 3a to 3d are provided.
The middle two stiffeners 3b and 3c are attached inside the steel pipe 1 so as to exactly match the connecting positions of the upper and lower pieces of the steel beam 2 made of H-shaped steel.

One steel pipe 1 has four stiffeners 3 in one set.
A plurality of sets a to 3d are provided in accordance with the connecting positions of the beams 2. Then, the concrete 4 is preliminarily lined in the factory by centrifugal force molding in the part separated by the stiffeners 3a and 3d at both ends of the set of stiffeners 3a to 3d. In this way, the concrete 4 is not lined over the entire length of the long steel pipe 1, but the concrete 4 is locally lined only at the places where the stiffeners 3a to 3d are provided at predetermined intervals. The lining concrete 4 has almost the same thickness as the overhanging dimensions of the stiffeners 3a to 3d, and has a circular hole in the center. Especially the two middle stiffeners 3b and 3c
Is completely embedded in the lining concrete 4, and the high-density lining concrete 4 formed by centrifugal force molding and the stiffeners 3a to 3d are extremely firmly integrated.

Steel pipe concrete columns partially lined with concrete 4 as described above are produced in a factory, transported to the site and built as shown in the figure. Then, at the site, concrete 5 is filled into the inside of the vertically lined partially lined concrete columns. With this, the steel pipe 1, the lining concrete 4 and the filled concrete 5 are completely integrated, and an excellent column structure having extremely high strength is obtained.

[0016]

As described in detail above, the partially-lined steel pipe concrete column of the present invention does not line concrete over the entire length of the steel pipe,
Since concrete is partially lined at the required points around the stiffener, the amount of lining concrete is small at the time of manufacturing this, so even if the total length of the steel pipe is very long, small-scale centrifugal force molding is required. Can be handled by equipment. Also, even if the total length is long, the amount of lining concrete is small, so the weight of the product is not so heavy, and transportation and construction work on site are easy. further,
Since the partially lined concrete and the stiffener are tightly integrated with each other, the strength of structurally important points such as a beam joint, a panel zone, and a hinge forming portion becomes extremely high. If this partial lining type steel pipe concrete column is built in the site and the inside is filled with concrete, the integrity of the steel pipe and the stiffener, and the lining concrete and the filled concrete will be very good, and the force transmitted from the beam to the steel pipe will be ensured. Can be transferred to concrete.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a partially lined steel pipe concrete column according to an embodiment of the present invention built in a site.

FIG. 2 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 1 Steel Pipe 2 Steel Beam 3a-3d Stiffener 4 Lining Concrete 5 Filled Concrete

Claims (2)

[Claims] 1. A stiffener projecting from the inner peripheral surface toward the center side is provided at a required place in a steel pipe, and concrete is lined in a plurality of regions inside the steel pipe bounded by these stiffeners by centrifugal force molding, and the lining region is provided. Partial lining type steel pipe concrete column characterized by setting a non-lining area between the lining area and the lining area. 2. The partially lined steel tube concrete column according to claim 1, wherein the stiffener is embedded in the lining concrete.