JPH0868114A - Steel pipe concrete column - Google Patents

Abstract

PURPOSE: To make the columns of the upper and lower stories equal in size, improve the manufacturing property and executing property, and make the column more lightweight toward the upper story by setting the filling factor of concrete filled into a steel pipe smaller toward the upper story. CONSTITUTION: A steel pipe column P is divided into K1-K4 in length for multiple stories. The filling factor of concrete C of the steel pipe K1 of the lower story is set to 100% or its proximity. The thickness (t) of the concrete C is made smaller toward the upper story, and the filling factor of the steel pipe column (n) is finally set to 0%. The filling factor is basically determined based on the structural yield strength required for the structural design. The steel pipe columns P1-P4 are vertically connected, and the steel pipe column (n) filled with no concrete is connected on the steel pipe column P4. Steel beams H are welded to the outer faces of steel pipes K1-Kn. The column can be made lightweight regardless of the outer diameter of the steel pipe, and the manufacturing property and the executing property at the site can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a column of a building of a low rise or above, and is particularly effective when applied to a steel pipe concrete structure of a structural type composed of a column filled with concrete inside a steel pipe and a steel frame beam. It is about technology.

[0002]

BACKGROUND OF THE INVENTION Steel-framed buildings have recently been widely constructed from low-rise to middle-high rise and super high-rise. And in such steel-framed buildings, columns,
The size of the steel frame such as the beams is made smaller in the upper floors, so that the weight of the steel frame itself and the cost can be reduced.

FIG. 4 shows a joint structure of pillars and beams when the pillar of the upper floor made of steel pipe is made smaller than the pillar of the lower floor. As the pillar P2 of the upper floor, its diameter d2 and wall thickness t2 are shown.
However, the diameter P1 and the wall thickness t1 of the pillar P1 on the lower floor are made smaller, and the upper and lower pillars P2 and P1 are joined to each other in the pillar-beam joint. In that case, the diameter d of the pillar P1 on the lower floor is at the lower end in the portion that serves as the joint (joint portion) of the pillars P2, P1 and the beams H2, H1 that intersect at right angles.
It is common to use a so-called tapered short pipe K for joining, which has the same diameter as that of No. 1 and the upper end has the same diameter as the diameter of the pillar P2 on the upper floor.

[0004]

By the way, in the structure in which the columns of the upper and lower floors made of steel pipe and the beam are joined by using the joining short pipe K as described above, compared with joining columns having the same diameter, Therefore, it requires a separate short pipe K for joining, which is time-consuming and costly to manufacture, and the short pipe K for joining is also required.
By using, the amount of welding increases correspondingly,
The joint end face of the beam also has a problem in terms of production and construction, for example, it has to be processed obliquely according to the outer surface of the short pipe K for joining. Further, since the size of the pillar is different between the upper floor and the lower floor, for example, the length of the beam is also different between the upper floor and the lower floor, which is not preferable in terms of architectural planning and design.

Therefore, in recent years, a technique for constructing using a steel pipe concrete column in which a steel pipe is filled with concrete has been developed, particularly as a column of a high-rise building.
Due to the synergistic effect of the steel pipe and the concrete, the steel pipe concrete column is a structural type that exhibits excellent properties in many aspects such as rigidity, proof stress, deformation performance, and fire resistance performance. Further, as a design advantage, since the column cross section can be made small and the column interval can be made wide, the effective space can be correspondingly enlarged.

However, in the case of this steel pipe concrete column,
Certainly, although it has excellent structural performance, it is a structure that fills the entire cross section in the steel pipe with concrete, so the weight and strength of the columns of the upper floor part will be unnecessarily large especially in middle and high rise buildings There is a problem in that. Therefore, also in this steel pipe concrete column, in order to reduce the weight, measures have been taken to sequentially reduce the size of the column toward the upper floors, and thus the short pipe K for joining as shown in FIG. 4 is also required. As a result, the same problem as described above occurred. Furthermore, in the case of this steel pipe concrete pillar,
In order to transfer the force from the beam to the filled concrete, the connection part was an inner diaphragm, which was also a cause of deterioration in manufacturability and workability.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention provides a steel pipe concrete column which can be made manufacturable and workable by making the size of columns on the upper and lower floors the same, and at the same time, can be reduced in weight toward the upper floor. The purpose is to Moreover, this invention aims at providing the steel pipe concrete pillar which can be used as a preferable form also from a building plan and a design.

[0008]

Means and Actions for Solving the Problems In the present invention,
By setting the filling rate of the concrete filled in the steel pipe to be smaller toward the upper floor, the weight of the columns on the upper floor will be gradually reduced. Therefore, since it is possible to reduce the weight regardless of the column size of the upper and lower floors, that is, the diameter of the steel pipe, it is possible to use steel pipes of the same size in the upper and lower floors, which improves manufacturability and workability.

Further, by adjusting the filling rate of the concrete with the thickness of the concrete covering the inner wall of the steel pipe, the structural yield strength of the entire steel pipe concrete column is adjusted. Here, when the concrete covering the inner wall of the steel pipe is provided by the centrifugal molding method, the thickness of the concrete can be freely adjusted, and the adhesion strength of the concrete to the steel pipe is improved. When the adhesion strength of concrete to the steel pipe is improved, the structure is such that the force from the beam is sufficiently transmitted to the concrete through the steel pipe, so that it is possible to use the inner diaphragm used conventionally as the outer diaphragm. The amount is reduced and the cost is reduced. Therefore, in the case of the centrifugal molding method, the steel pipe that constitutes the main body of the steel pipe concrete column is divided into multiple parts in the length direction so that the length reaches up to the first floor or multiple floors, and the structure is joined up and down. It is a preferable form in terms of workability, workability, structural performance and the like.

Further, the joints between the steel pipes are positioned between the beams which are vertically adjacent to each other,
The joining structure of the beam to the steel pipe is simplified, and the joining work of the upper and lower steel pipes can be performed on the beam directly below the joining portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying FIGS. FIG. 1 is a vertical sectional view of a steel pipe concrete column to which the present invention is applied, and FIG.
(E) is a transverse cross-sectional view of the portions indicated by (a) to (e) in FIG. 1. In these drawings, the steel pipe concrete column according to the present embodiment is indicated by a symbol P as a whole. This steel pipe concrete pillar P has a plurality of steel pipes k1, k2, k3 of unit length divided into lengths reaching one floor or a plurality of floors.
k4 and a plurality of unit steel pipe columns P1 and P2, each of which is composed of concrete C filled in each of the steel pipes,
P3 and P4 are joined vertically, and the steel pipe kn not filled with concrete is placed on the unit steel pipe pillar P4 on the upper floor.
Are joined together to extend from the lower floor to the upper floor. The steel beams H of each floor are welded to the outer surfaces of the steel pipes k1, k2, to kn that form the main body of the steel pipe concrete pillar P.

In the illustrated example, the steel pipes k1, k2, to kn constituting the main body of the steel pipe concrete column P have the same outer diameter and the same wall thickness, so that they are vertically adjacent to each other. The steel pipes are joined to each other by butt welding. These steel pipes k
Among the 1, k2, to kn, the concrete C filled in each steel pipe except the steel pipe kn of the upper floor is set such that the filling rate becomes smaller toward the upper floor as illustrated. The filling rate of each steel pipe is adjusted here by the thickness t of the concrete covering the inner wall of each steel pipe.

That is, in FIG. 1, the filling rate of the concrete C into the steel pipe k1 on the lower floor is 100% or close to it, but the thickness t of the concrete C gradually decreases toward the upper floor. Finally, it is set to be 0% like the steel pipe kn. The setting of the filling rate depends on the height of the building, but is basically determined based on the structural strength required for the structural design of each floor and the entire building.

The concrete C in the lower steel pipe k1 having a concrete filling rate of almost 100% can be filled with cast-in-place concrete. However, all steel pipes k2, k including concrete C in this steel pipe k1
The concrete C in 3 and k4 is preferably provided by a centrifugal molding method in which the concrete has a high adhesive strength to the inner wall of the steel pipe. This is because, according to the centrifugal molding method, not only the adhesion strength of the concrete C is remarkably increased, but also the thickness of the concrete C covering the inner wall of the steel pipe is made uniform, and the center portion has an extremely good structural strength. It is possible to easily form a perfect circular cavity Q that becomes
This is because the filling rate can be arbitrarily adjusted depending on the thickness of the product and the product can be manufactured as a highly accurate precast product in a factory or the like.

In the illustrated example, the floors of the respective floors are arranged so that the joints of the steel pipes k1, k2, to kn are located between the beams H connected to the steel pipes and vertically adjacent to each other. It is designed so as to be located immediately above the supporting beam H, so that consideration is made so as not to overlap with the joining position of the beam H to each steel pipe. This simplifies the structure for joining the beams to the steel pipes, and enables the joining work of the upper and lower steel pipes to be performed on the beams directly below the joining portions.

In order to construct the steel pipe concrete pillar P having such a structure, for example, in the vicinity of a factory or a construction site, unit steel pipe pillars having different filling rates of concrete C are prepared corresponding to the structural design of the pillar in advance. P1, P2, P
3 and P4 may be manufactured by a centrifugal molding method, and the construction may be performed while welding the beams H while sequentially welding them at a construction site.

According to the steel pipe concrete pillar P according to the embodiment, the filling ratio of the concrete C filled in each of the steel pipes k1, k2, k3, k4 is set to be smaller toward the upper floor. It is possible to gradually reduce the weight of the pillars on the upper floor. Therefore, since it is possible to reduce the weight regardless of the pillar size of the upper and lower floors, that is, the outer diameter of each steel pipe, it is possible to use steel pipes of the same size in the upper and lower floors.
The short pipe for connection can be eliminated and the amount of welding can be reduced to improve manufacturability and workability.

Further, concrete C covering the inner wall of each steel pipe
By adjusting the filling rate of the concrete C with the thickness of, the structural yield strength of the entire steel pipe concrete column P can be adjusted. By providing the concrete C covering the inner wall of each steel pipe by the centrifugal molding method, the thickness t of the concrete C can be freely adjusted, and the adhesion strength of the concrete to the steel pipe can be improved. When the adhesion strength of concrete to the steel pipe is improved, the force from the beam is sufficiently transmitted to the concrete through the steel pipe, so that it is possible to use the conventionally used inner diaphragm as the outer diaphragm. From this point as well, the amount of welding can be reduced and the cost can be reduced. When using the centrifugal molding method,
Steel pipe The steel pipe that constitutes the main body of a concrete column is divided into a plurality of parts in the length direction so as to reach the first floor or multiple floors, and it is a preferable form from the viewpoint of manufacturability to have a structure in which it is joined vertically. .

FIGS. 3 (A) to 3 (B) are cross-sectional views of a portion similar to that of FIG. 2 when a square steel pipe is used as the steel pipe concrete column P. In addition, this FIG.
Also in the steel pipe concrete column of the embodiment shown in (1), basically the same effects as those of the previous embodiment can be obtained.

In the above embodiment, each of the steel pipes k1, k2, to k forming the main body of the steel pipe concrete column P is formed.
Although all n have shown the example which used the steel pipe of the same size, especially when using it as a pillar of a high-rise or super-high-rise building,
For example, it is also possible to adopt a structure in which steel pipe concrete columns using steel pipes having a small outer diameter and a small wall thickness are joined for each of a plurality of stories or tens of stories. Even in such a case, the number of connecting short pipes can be extremely reduced, so that manufacturability and workability can be sufficiently improved. Further, a plurality of lower floors are constituted by ordinary steel pipe concrete columns which are almost 100% filled, and a plurality of upper floors are constituted by steel pipe concrete columns P according to the present invention, and further a plurality of upper floors thereof are constituted. The floor structure can be a column structure composed of ordinary steel pipe columns. Moreover, it is also possible to have a structure in which unit steel pipe columns having the same filling rate of concrete C are continuously joined vertically and two or more unit steel pipe columns having a smaller filling rate are joined successively.

[0022]

EFFECTS OF THE INVENTION According to the present invention, in a steel pipe concrete column including a steel pipe and concrete filled therein, extending from the lower floor to the upper floor, the filling rate of the concrete filled in the steel pipe goes to the upper floor. By making the configuration so small that it is possible to gradually reduce the weight of the pillars on the upper floor portion than on the lower floor. Therefore, since it is possible to reduce the weight regardless of the pillar size of the upper and lower floors, that is, the outer diameter of each steel pipe, it is possible to use steel pipes of the same size in the upper and lower floors.
It is possible to improve manufacturability and workability at a construction site by only butt welding with a small amount of welding. Further, since the pillars can be made to have the same size, it is possible to adopt a preferable form in terms of architectural planning and design.

Further, concrete C covering the inner wall of each steel pipe
By adjusting the filling rate of the concrete C with the thickness of, the structural yield strength of the entire steel pipe concrete column P can be adjusted. Further, by providing the concrete C covering the inner wall of each steel pipe by the centrifugal molding method, the thickness t of the concrete C can be freely adjusted, and moreover, the adhesion strength of the concrete to the steel pipe is improved and a good structure is obtained. It is possible to construct a steel pipe concrete column with high performance.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a steel pipe concrete column showing an embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view corresponding to each of A to E in FIG.

FIG. 3 shows another embodiment of the present invention, which is shown in FIG.
It is a transverse cross-sectional view corresponding to each part of E.

FIG. 4 is a vertical cross-sectional view of a steel pipe column showing a conventional example.

[Explanation of symbols]

 P Steel tube concrete column P1, P2, P3, P4 Unit steel tube column k1, k2, k3, k4, kn Steel tube C Concrete H Steel beam Q Cavity part t Thickness

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Terutake Imamura 2-10-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Co., Ltd. (72) Inventor Shigeru Yoshino 2-26-10 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd.

Claims (5)

[Claims] 1. A steel pipe concrete pillar including a steel pipe and concrete filled therein, extending from a lower floor to an upper floor, wherein the filling rate of the concrete is set to become smaller toward the upper floor. Concrete pillars. 2. The steel pipe concrete column according to claim 1, wherein the steel pipe is divided into a plurality of pieces in the lengthwise direction, and the concrete covers the inner wall of each of the divided steel pipes. 3. The steel pipe concrete pillar according to claim 1, wherein the filling rate of the concrete is adjusted by the thickness of the concrete covering the inner wall of the steel pipe. 4. The steel pipe concrete pillar according to claim 2, wherein the concrete covering the inner wall of the steel pipe is provided by a centrifugal molding method. 5. The steel pipe concrete column according to claim 1, wherein the joint portion between the steel pipes is located between beams vertically adjacent to each other.