JP2000027299A - Column structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column structure capable of preventing stress concentration of a connection portion, obtaining high strength and good deforming characteristics and allowing connection from a steel pipe or a steel framed reinforced concrete column to a reinforced concrete column at a lower layer of a high-rise building. SOLUTION: A column structure is a column between a steel pipe concrete or a steel framed reinforced concrete and an reinforced concrete in a multilayered building, with its outer periphery covered to be constrained by a cylindrical steel plate 3. The upper part of the column is a reinforced concrete in which main bars 14 and shearing reinforcing bars 13 are distributed and the lower part of the column is a steel pipe concrete or a steel framed reinforced concrete in which steel pipes or steel frames are incorporated. Reinforcing bars 4 are distributed for communicating the reinforced concrete with the steel pipe concrete or the steel framed reinforced concrete and rib plates 6 are laid between the steep plate and a steel pipe column or a column steel frame in which concrete 5 is filled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column structure of a building, and more particularly to a column structure at a switching portion between a steel frame reinforced concrete or a steel pipe concrete structure and a reinforced concrete structure of the building.

[0002]

2. Description of the Related Art In general, in a steel-framed reinforced concrete building, there has been a case where a steel reinforced concrete structure is switched from a steel-framed reinforced concrete structure to a reinforced concrete structure on a floor three to four floors below the top floor. This type of switching is considered to have relatively small column stress at the top of the building, relatively easy stress treatment, and sufficient strength in reinforced concrete construction. Are switched in the upper floors where there are relatively few.

[0003] In this case, the column of the switching portion has a structure in which the upper portion of the column is made of ordinary reinforced concrete, and the lower portion of the column is made of a steel reinforced concrete column, and the built-in steel frame is disposed up to the middle portion of the column.

[0004]

By the way, in high-rise and high-rise buildings with extremely large stress, if it is possible to switch from steel-framed reinforced concrete construction to reinforced concrete construction in the lower part thereof, the cost of the whole building will be large. Down or speeding up of the construction can be realized.

[0005] However, the conventional columns described above have been completely inadequate in terms of strength to be used in the lower part of the building where the stress is extremely large, for switching between steel reinforced concrete or steel pipe concrete and reinforced concrete.
That is, stress is not transmitted sufficiently at the joint between the steel reinforced concrete column and the reinforced concrete column, and the stress concentrates near the end of the column steel frame, so that the column at the switching portion cannot withstand the stress. In order to achieve this, it is necessary to ensure that stress is transmitted to the pillars of the switching section, and that sufficient strength and deformation performance are secured.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In a lower floor of a high-rise building having an extremely large stress, a switching portion for switching from a steel-framed reinforced concrete structure or the like to a reinforced concrete structure is provided. A pillar structure is provided.

[0007]

The present invention has the following arrangement to solve the above-mentioned technical problems. That is, a column of a switching portion between a steel pipe concrete part and a reinforced concrete part in a multi-story building, the outer periphery of the column is covered so as to be constrained by a steel plate formed in a tubular shape, and the upper part of the column is a main reinforcement and Shear reinforcement is reinforced concrete structure with reinforcement bars, the lower part of the column is a steel tube concrete structure with a built-in steel tube column, a reinforcement reinforcing bar connecting the reinforced concrete side and the steel tube concrete side is arranged, and the steel plate and A rib plate is interposed between the steel pipe columns.

Another aspect of the present invention is a column of a switching part between a steel reinforced concrete part and a reinforced concrete part in a multi-story building, wherein the outer periphery of the column is covered with a steel plate formed in a cylindrical shape. The upper part is a reinforced concrete structure with a main reinforcement and a shear reinforcement, and the lower part of the column is a steel reinforced concrete structure with a built-in steel column. In addition, a rib plate is interposed between the steel plate and the column steel frame. (Multi-layered structure) mainly refers to high-rise and high-rise buildings,
It is not limited to this. Here, the lower layer is a steel pipe concrete or a steel reinforced concrete structure, and the upper layer is a reinforced concrete structure capable of performing construction more quickly. (Reinforced concrete construction) This is a structure in which concrete is poured into a formwork in which reinforcing bars are placed and hardened. The structure mainly supports compressive stress with concrete and tensile stress with concrete bars fixed to concrete. Reinforcing bars arrange main bars and shear reinforcing bars inside concrete. (Concrete steel pipe construction) Concrete is poured into the surroundings of the steel pipe and inside the steel pipe by forming a formwork,
There is a structure in which concrete is filled in a steel pipe, and the structure widely uses a column having a structure in which a compressive stress is mainly supported by both a concrete and a steel pipe and a tensile stress is supported by a steel pipe filled with concrete. The steel pipe generally has a circular or rectangular cross section. (Steel-framed reinforced concrete construction) Form a frame around the steel frame,
It is a structure in which concrete is cast, and the structure mainly supports compressive stress by concrete and steel frames, and supports tensile stress by steel frames and reinforcing bars fixed to concrete. There is also a steel concrete structure in which a reinforcing bar that does not play a role of supporting the tensile stress is arranged around the steel frame. (Switching portion) This is a boundary between a steel-framed reinforced concrete structure or the like and a reinforced concrete structure, and is a portion where both are continuously integrated. (Steel plate) A cylindrical body having a circular or rectangular cross-sectional shape, which usually conforms to the cross-sectional shape of the column covered by the cross-section and restrains the concrete around the column. (Steel frame) It is generally used as a column steel frame, and is preferably one having a flange portion at least in part such as H steel, or a shape combining these. (Reinforcing bars) It is desirable to use deformed reinforcing bars in order to improve the degree of fixation to concrete. In the vicinity of the switching part of the reinforced concrete structure, it is preferable to arrange the main reinforcing bars and the shear reinforcing bars densely in order to cope with stress concentration due to the difference in rigidity with the steel pipe or the steel reinforced concrete structure. (Rib plate) It is attached to the outer peripheral surface of the steel pipe or steel frame inside by welding or other means. Further, the end portion is brought into contact with and welded to the inner wall of the steel plate on the outer periphery, so that the inner steel pipe and the steel frame can be integrated with the outer steel plate. In this way, the concrete to be filled in the pillar can be more strongly restrained.

As described above, with the structure in which the periphery of the column of the switching portion is covered with the steel plate and constrained, the strength of the switching portion becomes extremely high, and stress transmission is ensured. Also, due to the difference in rigidity between the reinforced concrete structure at the upper and lower portions of the column and the steel reinforced concrete structure or the steel tube concrete structure, deformation concentration on the reinforced concrete portion at the upper portion of the column is eased. Furthermore, the restraint of the concrete by the steel plate has improved the anchoring performance between the concrete and the reinforcing steel bar or the steel frame, and improved the concrete strength.

[0010] Further, by providing a fixing metal for fixing to the steel pipe or steel frame to be built in, the integrity of these with concrete can be further improved, and the column strength can be improved.

Since the steel sheet 3 covering the switching portion can be used as a concrete formwork during construction, there is an advantage that the formwork of the pillar can be omitted.

At the time of construction, the lower steel pipe concrete column or the steel reinforced concrete column is installed.
Since the reinforced concrete part is built on the upper part, these columns function as temporary columns. Therefore, simultaneous construction of the upper layer and the lower layer of the building becomes possible, and the construction period can be shortened.

Further, the present invention can sufficiently cope with a switching portion between a steel pipe concrete structure and a reinforced concrete structure, for which an appropriate method has not been established in the past, so that the degree of freedom in designing a building is expanded.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete column structure of the present invention will be described below in more detail with reference to the embodiments shown in FIGS. (Embodiment 1) Embodiment 1 will be described with reference to FIGS.

FIG. 1 shows a structure of a column in a building where a steel pipe concrete structure is switched to a reinforced concrete structure. Such pillars are formed, for example, on the third floor of a high-rise building.

Steel frame concrete beam 1 located on the lower floor side
Numeral 0 has a beam steel frame 11 inside. The upper floor (for example, the fourth floor) is made of reinforced concrete and includes a shear reinforcing bar 13 and a beam main bar 14 therein. The steel concrete beam 10 is held by a steel pipe concrete column 1a located on the lower side thereof.
In a, the cross section for filling concrete is a square. The steel pipe concrete column 1a has a steel pipe 7 having a reduced diameter at the upper end extending from the switching portion.
Is joined to.

As shown in FIG. 3 and FIG. 4, around the upper part of the steel pipe 7, a total of eight fixing hardware 1 are provided, two on each surface.
5 are welded. The fixing hardware 15 is provided to extend in the horizontal direction, in order to ensure the integrity with the concrete to be cast later and to ensure the transmission of the stress from the main pillar 4b. And these fixing hardware 15,
The rib plate 6 is disposed vertically between the ribs 15.

A steel plate 3 is attached so as to be wound around the entire outer peripheral portion of the column at the boundary between the reinforced concrete column 2 and the steel tube concrete column 1a. The inner diameter of the steel plate 3 is substantially the same as the diameter of the column, and the rib plate 6 is brought into contact with and welded to the inner wall of the steel plate 3, so that the steel pipe 7 and the steel plate 3 are integrated.

On the other hand, inside the reinforced concrete column 2 on the upper floor side, a reinforcing bar 4 composed of a shear reinforcing bar 4a and a main bar 4b is densely assembled. Here, a main reinforcement 4b communicating from the reinforced concrete column 2 to the steel pipe concrete column 1 is provided.
As shown in FIG. 1 and FIG. 3, this passes through the gap between the steel tube concrete column 1a and the steel plate 3, and its lower end is arranged to the upper end of the steel reinforced concrete beam 10.

In this state, concrete 5 is poured into columns and beams around the reinforcing bar 4 and around the steel reinforced concrete beam 10 provided with a formwork. At the time of this concrete casting, the steel plate 3 can be used as a formwork, so that the formwork work of the switching portion is unnecessary. When the concrete 5 is solidified, the steel pipe concrete column 1a and the reinforced concrete column 2 are firmly integrated.

As described above, the periphery of the connection portion is reinforced by the steel plate 3. (1) Stress concentration near the end of the column steel frame extended from the lower floor can be reduced.
(2) Since the deformation concentration on the reinforced concrete column 2 due to the difference in rigidity between the steel pipe concrete column 1 and the reinforced concrete column 2 is reduced, the deformation characteristics of the entire column are improved.
(3) Since the steel plate 3 functions as a shear reinforcement below the connection portion, there is an advantage that the installation of the shear reinforcement can be omitted. (Embodiment 2) Embodiment 2 will be described with reference to FIGS.

In this embodiment, the lower layer is made of steel reinforced concrete.

FIG. 5 shows a column part which is switched from a steel reinforced concrete structure to a reinforced concrete structure in a building. The steel reinforced concrete beam 10 located on the lower side has a beam steel 11 inside. The upper floor is made of reinforced concrete, in which a shear reinforcing bar 13 and a beam main bar 14 are closely assembled and arranged.

A steel column 17 is provided inside the steel reinforced concrete column 1b. As shown in FIG. 6, the pillar steel frame 17 has a shape in which a flange 7a is formed on a web having a cross-shaped cross section. The fixing hardware 15 is welded to the flange 17a, two for each surface, a total of eight.
The fixing hardware 15 is for ensuring the integrity with the concrete filled in the column and for ensuring the transmission of stress from the column main reinforcement 4b. Further, a rib plate 6 is provided between the fixing hardware 15 in the vertical direction.

A tubular steel plate 3 having a rectangular cross section is fitted around the outer periphery of the column at the switching portion. At this time, the inner diameter of the steel plate 3 is the same as the width between the ends of the rib plate 6, and the rib plate 6 is brought into contact with and welded to the column steel 17 and the steel plate 3, so that the column steel 17 and the steel plate 3 are integrated. .

Subsequently, the reinforced concrete column 2 located on the upper side is joined so as to be continuous with the steel reinforced concrete column 1b, and a part of the main reinforcement extending from the reinforced concrete column 2 communicates with the steel reinforced concrete column 1b. Further, the remaining main bars are arranged up to the upper end of the lower beam 10. Thus, the reinforcing bar around the column steel frame is a main bar extending from the reinforced concrete column 2, and the main bar 4 b passes through a gap between the column steel frame 17 and the steel plate 3.

In this state, the reinforced concrete column 2
Concrete 5 is cast together with. When the concrete 5 is solidified, the steel frame reinforced concrete column 1b and the reinforced concrete column 2 are firmly integrated.

Other operations and the like are the same as those in the first embodiment, and therefore will not be described.

[0029]

According to the present invention, in a high-rise portion or a high-rise building, a high-load portion of a lower floor, which has not been conventionally possible, is used.
It is now possible to provide a switching part between a steel pipe concrete part or a steel reinforced concrete part and a reinforced concrete part.

[Brief description of the drawings]

FIG. 1 is a side view showing an internal structure of an entire concrete column structure according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an AA cross section in FIG.

FIG. 3 is a transverse sectional view showing a BB section in FIG. 1;

FIG. 4 is a perspective view showing the structure of the upper part of the column steel pipe according to the first embodiment.

FIG. 5 is a side view showing the internal structure of the entire concrete column structure according to the second embodiment of the present invention.

FIG. 6 is a perspective view illustrating a structure of an upper part of a column steel frame according to a second embodiment.

FIG. 7 is a cross-sectional view showing a CC section in FIG. 5;

FIG. 8 is a transverse sectional view showing a DD section in FIG. 5;

FIG. 9 is a transverse sectional view showing a section taken along line EE in FIG. 5;

[Explanation of symbols]

 1a Steel pipe concrete column 1b Steel frame reinforced concrete column 2 Reinforced concrete column 3 Steel plate 4 Reinforcement 5 Concrete 6 Rib plate 15 Fixing hardware 17 Column steel frame

Continued on the front page (72) Inventor Osamu Konno 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. F term (reference) in Industrial Co., Ltd. 2E125 AA04 AB16 AC01 AC16 AG32 AG48 AG49 AG57 BC09 BD01 BE02 CA90 2E163 FA02 FB07

Claims (4)

[Claims] 1. A column of a switching portion between a steel pipe concrete portion and a reinforced concrete portion in a multi-story building, wherein the outer periphery of the column is covered by a cylindrical steel plate so as to be constrained, and the upper portion of the column has a main reinforcement and Shear reinforcement is reinforced concrete structure with reinforcement bars, the lower part of the column is a steel tube concrete structure with a built-in steel tube column, a reinforcement reinforcing bar connecting the reinforced concrete side and the steel tube concrete side is arranged, and the steel plate and A column structure in which a rib plate is interposed between steel pipe columns. 2. A pillar of a switching part between a steel reinforced concrete part and a reinforced concrete part in a multi-story building, wherein the outer periphery of the pillar is covered so as to be restrained by a steel plate formed in a cylindrical shape, The upper part is a reinforced concrete structure with main bars and shear reinforcement bars, and the lower part of the column is a steel reinforced concrete structure with a built-in column steel frame. And a rib plate is interposed between the steel plate and the column steel frame. 3. A steel plate concrete column is provided with a rib plate at an upper end portion of the steel tube column, and an outer end of the rib plate is brought into contact with an inner wall of the steel plate and welded to join the upper end portion of the steel tube column and the steel plate. The pillar structure according to claim 1. 4. A rib plate is provided on an upper end of a steel column of the steel reinforced concrete column, and an outer end of the rib plate is brought into contact with an inner wall of the steel plate and welded to join the upper end of the column steel frame and the steel plate. The pillar structure according to claim 2.