JPS61179947A - Steel pipe concrete composite pillar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial application field The present invention relates to a steel pipe concrete composite column.

BACKGROUND OF THE INVENTION Recently, steel pipes, such as H-section steel, which have higher compressive strength and bending strength than other section steels, have been widely used as steel columns. Furthermore, to increase its strength, concrete-filled steel pipe columns are also used, which are made by arranging reinforcing bars along the entire length of the steel pipe and filling it with concrete.

By the way, in general, the joints of beam materials are subject to greater bending and shearing forces than other parts of pillar materials, so in steel pipe columns, this part is made thicker than other parts, or a diaphragm is installed. It is reinforced by

In addition, for concrete-filled steel pipe columns, a method of arranging reinforcing bars within the steel pipe along its entire length has been considered, but this method not only makes it troublesome to arrange the reinforcing bars, but also prevents the concrete from forming inside the steel pipe. Since it is not possible to go around every corner, it is not possible to integrate the steel pipe, reinforcing bars, and concrete, and there are cases where sufficient reinforcement by reinforcing bars and concrete cannot be achieved.

Purpose of the Invention The present invention was proposed in order to solve the above-mentioned conventional problems, and provides a steel-tube-concrete composite column in which reinforcement of beam joints in steel-tube concrete can be performed extremely easily and reliably. The purpose is to

Composition of the Invention This invention arranges a reinforcing bar cage consisting of main reinforcement and hoop reinforcement only in the beam joint or reinforcement joint of a steel pipe column,
The above object is achieved by filling the entire length of the steel pipe with concrete.

EXAMPLE Hereinafter, this invention will be explained with reference to an example shown in the drawings.A reinforcing bar 2 is inserted into a beam joint of a steel pipe column 1 having a circular or square cross section. In addition, a plurality of small holes 3 are formed in the side surface of the beam joint of the steel pipe column 1, and further,
Two outer diaphragms 4, 4 are welded to correspond to the backs of the beams to be joined.

The reinforcing bars 2 are formed from the plurality of main reinforcing bars 5, 5 and the plurality of hoop or spiral reinforcing bars 6. In the case of the circular steel pipe column 1, the reinforcing bars 2 have a circular shape that is one size smaller than this, and in the case of the square steel pipe, they have a rectangular shape with a smaller circumference. It is structured in the shape of a short column.

Hooks 5a, 5a are formed at both upper and lower ends of the main reinforcements 5, 5. In addition, a plurality of protrusions 7, 7 are attached to the main reinforcements 5, 5 to press against the inner surface of the steel pipe column 1, making it possible to temporarily fix the reinforcing bars 2 inside the steel pipe column 1 before welding. ing. The protrusion 7 is formed by bending a reinforcing bar into a bow shape or an L shape, is attached to the main reinforcing bar 5 by welding, and has a certain degree of elasticity (Fig. 4,
(See Figure 9). Fixed reinforcing bars 8, 8 are horizontally welded between the left and right projections 7, 7, and by spot welding the reinforcing bars 8.8 and the steel pipe column 1 through the small holes 3, the reinforcing bars 8.
is fixed in the beam joint of the steel pipe column 1 (see Fig. 5).

Further, the steel pipe column 1 is filled with concrete 9 to a predetermined thickness over the entire length of the steel pipe column l, and the reinforcing bars 2 are completely buried in the concrete 9.

The concrete 9 is compacted by using centrifugal force and is densely filled.

Note that the concrete 9 may be filled only in the joints of the beams.

10 and 11 show an embodiment of the column-beam joint of the present invention, in which only reinforcing bars and 2 are arranged in the beam joint of the steel pipe column 1, and the concrete 9 is the steel pipe column. After 1 is erected, the entire steel pipe is filled.

FIG. 8 shows an embodiment in which reinforcing bars 2 are arranged only at the joints of the braces 13 of the steel pipe column 1.

Effects of the Invention Since the present invention has the above configuration, it has the following effects.

■ Reinforcing bars are placed only in the joints of the beams of steel pipe columns, so effective cross sections can be obtained that match the areas with large bending and shearing forces, making lean design extremely simple and reliable. Moreover, it can be done very economically.

■ The sides of each reinforcing bar corner are equipped with multiple protrusions that press against the inner surface of the steel pipe column, making it easy and secure to set the reinforcing bar cage in the specified position inside the steel pipe before welding. can.

In the embodiment, (1) the reinforcing bars are fixed to the steel pipe by welding through small holes provided in the side surface of the steel pipe column, so welding can be done very easily. Moreover, there is no need to worry about the reinforcing bars shifting when filling with concrete.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention; Figure 1 is a partially cutaway perspective view of a steel pipe concrete composite column;
Figure 2 is a partial longitudinal sectional view of the same, Figure 3 is A in Figure 2.
4 is a sectional view taken along line B-B in FIG. 3, FIG. 5 is a sectional view taken along line A-A in FIG. 2, similar to FIG. 3, and FIG. A sectional view taken along the line C-C, Fig. 7 is a sectional view of a circular steel pipe concrete composite column, Fig. 8 is a partial longitudinal sectional view showing the state of connection between the steel pipe concrete composite column and braces, and Figs. 9 to 11. 9 shows another embodiment of the present invention. FIG. 9 is a partial sectional view of a steel pipe concrete composite column showing a modified example of the protrusion, and FIGS.
FIG. 2 is a vertical cross-sectional view and a cross-sectional view of a beam joint. 1...Steel pipe column, 2...Rebar cage, 3...Small hole, 4...Outer diaphragm, 5...Main bar, 6...Spiral bar, 7...Protrusion, 8...Fixed reinforcing bar, 9... Concrete, 10...beam material,
11. Beam formwork, 12. Vertical bracket. Figure 1 Figure 3 Figure 5] No. 6j!

Claims (1)

[Claims] A steel pipe concrete characterized in that a reinforcing cage consisting of a main reinforcement and a hoop reinforcement is placed only in a steel pipe serving as a beam joint or a bracing joint, and the steel pipe is filled with concrete over its entire length. Composite column.