JPH05272198A - Core column - Google Patents

Abstract

PURPOSE:To suppress increase of bending yield strength by imbedding a core column, in which solidification agent is filled in a cylinder in which spiral shear reinforcing bars are brought into close contact with each other, in columns at the lower story of ultra high multistory reinforced concrete building. CONSTITUTION:First, a pressure bearing plate 3 is welded to the lower end of a cylinder 2 in which steel bars 1 whose cross section is rectangular are placed spirally, and mutually closely, and solidification agent 4 such as high strength concrete is filled in the cylinder 2 to form a core column A. The steel bars 1 which have adequate diameter in accordance with yield strength of the core column A are used and formed closely with clearance of about 0 to 2mm. Also, a diameter and length of the cylinder 2 are determined depending on the place where it is used. As for solidification agent 4, concrete, mortar, cement paste, and plaster are used in addition to high strength concrete in accordance with strength required for the core column A. Next, the core column A is imbedded in columns at the lower story of ultra high multiple dwelling house and high wall type multiple dwelling house made of reinforced concrete and subsidiary columns at the lower story of a multiple layer earthquake- resistant wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core column buried in a lower floor column of a super high-rise reinforced concrete building or an incidental column of a lower floor of a multi-story earthquake-resistant wall.

[0002]

2. Description of the Related Art Lower floor columns of super high-rise reinforced concrete buildings and incidental columns on the lower floors of multi-story earthquake-resistant walls are repeatedly subjected to high axial compressive force and shearing force during an earthquake, causing core concrete to collapse and become brittle. It may cause a general destruction. Therefore, in the past, such a design of the core concrete was restrained only by the stirrups, but with this amount of stirrup, the crushing of the core concrete gradually progressed and the behavior was poor in toughness. .. Therefore, in order to prevent such crushing of the core concrete, it has been considered to increase the amount of stirrup or main bar.

[0003]

However, if the amount of stirrup is increased as in the former case, a large deformation performance can be secured, but since the pitch of the stirrup becomes extremely small, concrete can not be placed well, and instead the pillar There is a possibility that the strength and toughness of the steel may be reduced. In addition, increasing the amount of main reinforcement increases the bending strength of columns and earthquake-resistant walls, making it difficult to design for the shearing force that increases with it, resulting in brittle shear failure. ..

As described above, since it is desirable that the fracture shape of the column or the earthquake-resistant wall is bending fracture excellent in toughness, it is not preferable to increase the bending proof strength more than necessary. On the other hand, such a column may be designed as a steel-framed reinforced concrete column, but this has a problem that the construction period is long and the construction cost is high.

The present invention has been made in view of the above-mentioned various problems, and an object of the present invention is to improve the bending strength of a lower floor pillar of a super high-rise reinforced concrete building or an incidental pillar of a lower floor of a multi-story earthquake-resistant wall. Can be suppressed, and high axial compression force,
It is to provide a core column having excellent deformability under shearing force.

[0006]

The core column of the present invention for attaining the above-mentioned object is to support at least one of the upper and lower ends of a cylindrical body formed by closely adhering spiral reinforcing reinforcements. A plate is provided, and a solidifying material is filled in the cylindrical body, the shear reinforcing bar is a high-strength deformed PC steel bar or deformed reinforcing bar, and the shear reinforcing bar has a rectangular cross section. That is.

[0007]

According to the above configuration of the present invention, the effect of restraining the spiral shear reinforcing bar in the triaxial compression state,
Due to the effect of compressive load due to the close contact of the shear reinforcement bars, the core column has large compressive strength and compression toughness like steel pipe concrete, and the bearing plate causes the core column to be buried in the foundation beam or foundation slab. Can be prevented
Since the shear reinforcing bar was a high-strength deformed PC steel bar or deformed reinforcing bar, the adhesiveness and integrity with concrete could be enhanced, and the rigidity could be increased by making the shear reinforcing bar rectangular in cross section.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a vertical sectional view showing an embodiment of a core column of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a perspective view thereof.

The core pillar A has a steel plate 1 having a rectangular cross section and a pressure bearing plate 3 at the lower end of a cylindrical body 2 which is spiral and closely adheres to each other.
Are welded, and the solidified material 4 such as high-strength concrete is filled in the cylindrical body 2. The steel rod 1 has an appropriate diameter depending on the proof stress of the core column A, and is closely formed with a gap of about 0 to 2 mm. Further, the diameter and length of the tubular body 2 are determined according to the place of use. As the solidifying material 4, in addition to the high-strength concrete, concrete, mortar, cement paste, gypsum, or the like is used depending on the strength required for the core pillar A.

4 and 5 show reinforcing bars 2a arranged along the center of the core pillar A or the inside of the cylindrical body.
Further, FIG. 5 shows a tubular body 2 formed of a steel rod 1 having a rectangular cross section, and FIG. 6 shows bearing plates 3 provided at both upper and lower ends of the tubular body 2. It is welded in a state of being placed on the upper end of the tubular body 2 and has a hole 3a for filling the solidifying material.

FIG. 8 shows the core pillars A arranged at the four corners of the lower-floor pillar m in a super high-rise apartment house, and the length is halfway to the lower-floor pillar m as shown in FIG. .. Also,
When the lower floor pillar m is arranged over the entire length as shown in FIG. 9, the pressure bearing plates 3 are provided at the upper and lower ends of the cylindrical body 2.

10 to 10 show another method of arranging the core pillar A in the lower-floor pillar m of the super high-rise apartment building, and FIG. 11 shows the method of arranging the core pillar A in the incidental pillar n on the lower floor of the multi-story earthquake-resistant wall. In that case, FIG. 12 shows a case where the high-rise wall type housing is arranged on the lower floor pillar s. The arrangement method of the core pillars A is not limited to the above case, and can be arbitrarily selected according to the shape and size of the building. In addition, when the core pillar A is arranged along the entire length of the lower floor pillar m, or when it is arranged up to a midway portion, when the bearing plates 3 are provided at the upper and lower ends of the core pillar, the shape of the building is the same as above. It can be arbitrarily selected according to the size.

As described above, the core pillar A of the present invention is embedded in the lower-floor pillar m of the super high-rise apartment house, the lower-floor pillar n of the high-rise wall type apartment building, and the incidental pillar s of the lower floor of the multi-story earthquake-resistant wall. As a result, it is possible to reduce the compressive axial force, which has been borne by the cast-in-place concrete having insufficient properties up to now, and it is possible to construct a tough column by allocating the compressive force to the core column A. became. Further, since the core column A hardly bears the tensile force, it is possible to suppress an increase in bending strength and an increase in shear stress.

[0014]

EFFECTS OF THE INVENTION The core column has the same compressive strength and compressive toughness as steel pipe concrete due to the restraining action of the shear reinforcing bar in the triaxial compression state and the action of the compression load due to the spiral reinforcing closely contacting the shear reinforcing bar. At the same time, the rigidity of the core column is increased by increasing the material strength of the filling material, so that it is possible to bear a larger force.

By providing the bearing plates on at least one of the upper and lower ends of the cylindrical body, the bearing area of the lower end of the core column is increased, so that even if the proof stress of the core column is increased, the core column is not supported by the foundation beam. Or, it will not be buried in the foundation slab.

By using the deformed PC steel bar as the shear reinforcing bar, the proof stress of the core column can be increased, and
The rigidity can be increased.

By using the deformed reinforcing bar as the shear reinforcing bar, it is possible to enhance the adhesiveness with the solidifying material.

Since the shear reinforcing bar has a rectangular cross section, the compressive force load due to the metal touch is large and the rigidity can be increased. Therefore, the ratio of the compressive force load of the core column is increased, and The compression load is large.

By freely selecting the diameter and length of the core column, the diameter and strength of the shear reinforcing bar, the compressive strength of the solidifying material, etc., it is possible to use the core column according to the design, so that the degree of freedom in design is increased. Can be extended.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a core column.

FIG. 2 is a plan view of a core column.

FIG. 3 is a perspective view of a core column.

FIG. 4 is a plan view of a core column in which reinforcing bars are arranged.

FIG. 5 is a vertical cross-sectional view of a core column using a steel rod having a rectangular cross section.

FIG. 6 is a front surface of a core column provided with pressure bearing plates at both upper and lower ends.

FIG. 7 is a plan view of a core column provided with pressure bearing plates at both upper and lower ends.

FIG. 8 is a horizontal cross-sectional view of a lower-floor pillar of a super high-rise apartment with core pillars.

FIG. 9 is a vertical cross-sectional view of a lower floor pillar of a super high-rise apartment in which core pillars are arranged.

10A to 10D are vertical cross-sectional views of a lower floor pillar of a high-rise apartment building showing another method of arranging core pillars.

FIG. 11 is a cross-sectional view of an incidental column on the lower floor of a multi-story earthquake-resistant wall in which core columns are arranged.

FIG. 12 is a cross-sectional view of a lower-floor pillar of a high-rise wall-type apartment in which core pillars are arranged.

[Explanation of symbols]

 A: Core pillar 1: Steel rod 2: Cylindrical body 3: Bearing plate 4: Solidifying material

Claims (4)

[Claims] 1. A pressure-bearing plate is provided on at least one of the upper and lower ends of a cylindrical body formed by closely adhering spiral reinforcing reinforcements to each other, and a solidifying material is filled into the cylindrical body. The core pillar to do. 2. The core column according to claim 1, wherein the shear reinforcing bar is a high strength deformed PC steel rod. 3. The core column according to claim 1, wherein the shear reinforcing bar is a deformed bar. 4. The core column according to claim 1, wherein the shear reinforcing bar has a rectangular cross section.