JPH07259254A - Axial force transmission column - Google Patents

Abstract

PURPOSE:To prevent the transmission of bending moment to an axial force transmission column by holding cushioning material between the upper end of a steel pipe and an upper slab, and deforming the cushioning material elastically at the time of load being applied to the slab. CONSTITUTION:Column reinforcement, hoop reinforcement 19 and core reinforcement 20 are respectively set inside a steel pipe 12, and the steel pipe 12 is erected in a specified position on the lower slab 13 of a structure skeleton. After installing the form of an upper slab 14, concrete is placed in the form and the steel pipe 12. In an axial force transmission column 11, cushioning material 16 is held between the upper end of the steel pipe 12 and the upper slab 14, and the column reinforcement 18 is not embedded inside the upper and lower slab 13, 14. When horizontal load is applied to the slabs 13, 14 at the time of an earthquake, elastic deformation is generated to the cushioning material 16 so as to prevent the horizontal load from being transmitted to the axial force transmission column 11 and thereby to prevent the transmission of bending moment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column designed in an architectural and civil engineering structure on the assumption that only axial force is transmitted.

[0002]

2. Description of the Related Art Recently, a new structural type has been adopted in the design of building structures such as office buildings and high-rise condominiums. In such a structural type, columns that transmit only axial force are used. May be

FIG. 5 shows a part of the skeleton of an office building to which the U-shaped bracket construction method is applied. 2 on slab 1
The pillars 2 and 2 of the book are erected, and U-shaped brackets 3 and 3 facing each other are provided on the upper portions of the pillars 2 and 2. A large span of about 16 to 20 m is provided between the U-shaped brackets 3 and 3. An RC beam 4 is installed. And Slab 1 and RC
RC is divided into short spans of about 5 to 7 m between the beams 4.
An axial force transmission column 5 that supports the beam 4 is provided.

Further, FIG. 6 shows a part of the skeleton of a high-rise apartment building to which a core and a ramen structure are applied. An outer pillar 7 and a core wall 8 are erected on the slab 6, and a flat slab 9 is constructed between the outer pillar 7 and the core wall 8.
An axial force transmission column 10 that supports the flat slab 9 is provided.

[0005]

However, when the axial force transmission columns 5 and 10 are RC columns in the conventional building structure, the axial force transmission columns 5 and 10 are integrated with the concrete slabs above and below. Therefore, the axial force transmission columns 5 and 10, which should have been designed on the assumption that only the axial force from the slab is transmitted, will not only have a long-term bending moment but also a bending moment during an earthquake in addition to the axial force. Since it will be received, there is a possibility that a problem such as not obtaining a predetermined construction accuracy may occur.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an axial force transmission column capable of reliably preventing a bending moment from being received.

[0007]

In order to achieve the above object, the axial force transmission column of the present invention is installed between a slab on an arbitrary floor and a slab on the floor immediately above the slab on any floor in a structure. A column of a steel pipe concrete structure that receives an axial force from a slab, the lower end of which is fixed to the lower slab and is erected between the lower slab and the upper slab, and is cast inside the steel pipe. Concrete, columnar bars arranged so as not to be embedded inside any of the lower slab and the upper slab while being embedded by extending in the axial direction inside the steel pipe, and inside the steel pipe. Consists of core bars embedded near the lower end and near the upper end and penetrating the lower slab and the upper slab, respectively, and an elastically deformable cushioning material sandwiched between the peripheral portion of the upper end of the steel pipe and the upper slab. Characterized by being It is intended to. Further, it is desirable that the core bars are respectively embedded in the vicinity of the center of the cross section of the steel pipe, and a connecting member is fitted to a peripheral portion of the upper end of the steel pipe, and the cushioning material is fixed to the connecting member. You may do it.

[0008]

In the axial force transmitting column of the present invention, the cushioning material is sandwiched between the upper end of the steel pipe fixed to the lower slab and the upper slab, and the column bar extending in the axial direction is inside the upper and lower slabs. Since the structure is not embedded in the slab, even if a load is applied to these slabs in the horizontal direction, elastic deformation will occur in the cushioning material and the horizontal load will be transmitted via the column bars. Therefore, it is possible to prevent the bending moment from being transmitted to the axial force transmitting column.
Also, for the horizontal shear force and axial force that occur simultaneously,
Core muscles penetrating the lower and upper slabs receive these forces to resist.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing an axial force transmission column 11 of the present embodiment. The axial force transmission column 11 is designed to transmit only an axial force by a steel pipe concrete structure, and is provided on an arbitrary floor (n floor) of a building structure. ) And the floor immediately above it (n + 1 floor).

As shown in FIG. 1, a steel pipe 12 is erected between an n-th slab (hereinafter referred to as a lower slab) 13 and a (n + 1) -th slab (hereinafter referred to as an upper slab) 14. ing. The steel pipe 12 is a circular pipe, and an annular ring base 15 is provided at the lower end of the steel pipe 12, and the ring base 15 is fixed to the lower slab 13. On the other hand, an annular cushioning member 16 made of an elastic material such as rubber and elastically deformable is attached to the entire upper edge of the steel pipe 12 via a connecting metal member (connecting member) 17, and the upper surface of the cushioning member 16 is It contacts the lower surface of the upper slab 14.

FIG. 2 is an enlarged view of a portion of the upper end of the steel pipe 12 where the cushioning material 16 is attached. As shown in this figure, the connection metal fitting 17 is fitted to the upper end of the steel pipe 12,
The cushioning material 16 is fixed to the. Connection hardware 17 is steel pipe 1
2 a pair of side plates 17a, 17a, which surrounds the entire peripheral edge of the upper end, and which are in contact with the wall 12a of the steel pipe 12 on the outer wall surface side and the inner wall surface side, respectively, and the pair of side plates 17a, 1a.
It is an inverted U-shape having an upper plate 17b connecting 7a. The cushioning material 16 is fixed to the upper plate 17b of the connection hardware 17 by an adhesive.

As shown in FIGS. 1 and 3, a plurality of axially extending column bars 18, 18, ... Are embedded in the steel pipe 12 at equal intervals along the circumferential direction of the steel pipe 12. .
The column bars 18, 18, ... Are set in such a length and position that they are not embedded in either the lower slab 13 or the upper slab 14. Further, annular hoop reinforcements 19 are embedded in the steel pipe 12 at regular intervals so as to surround the plurality of column reinforcements 18, 18, ....

Further, as shown in FIGS. 1 and 4, core bars 20, 2 are provided near the upper end and the lower end inside the steel pipe 12.
0 is embedded near the center of the cross section of the steel pipe 12 so as to penetrate the upper and lower slabs 13 and 14, respectively.
These core muscles 20 and 20 have a plurality of axial muscles 21 and 2, respectively.
, And axial hoop muscles 22, 22, ..., The axial hoop muscles 22 are embedded at regular intervals so as to surround a plurality of axial muscles 21, 21, ... That extend in the axial direction of the steel pipe 12. ing.

When constructing the axial force transmission column 11 having the above-mentioned structure, after the column reinforcement 18, the hoop reinforcement 19, and the core reinforcement 20 are set in advance inside the steel pipe 12, respectively, the lower slab in the skeleton of the building structure is constructed. The steel pipe 12 is erected at a predetermined position on 13. Then, after installing the form 23 of the upper slab 14,
Concrete 24 is placed in the mold 23 and the steel pipe 12. It should be noted that FIG. 1 shows a state in which concrete placing up to the lower slab 13 is completed.

In the axial force transmission column 11 of this embodiment, the cushioning material 16 is sandwiched between the upper end of the steel pipe 12 and the upper slab 14, and the column bar 18 is provided inside the upper and lower slabs 13 and 14. Since the structure is not buried, even when a load is applied to the slabs 13 and 14 in the horizontal direction such as during an earthquake, the cushioning material 16 is elastically deformed and the column bars 18 are interposed. As a result, the horizontal load is not transmitted to the axial force transmission column 11, so that it is possible to prevent the bending moment from being transmitted to the axial force transmission column 11.

At this time, a horizontal shearing force and an axial force are also generated between the slabs 13 and 14 and the axial force transmitting column 11.
The core muscles 20 penetrating the slabs 13 and 14 can be resisted by receiving these forces. Further, since the core bar 20 is embedded near the center of the cross-sectional surface of the steel pipe 12, even when the core bar 20 is embedded in the slab, the transmission of the bending moment to the axial force transmission column 11 is ensured. Can be prevented.

As a result, in the axial force transmitting column 11 of this embodiment, only the axial force received from the upper and lower slabs 13 and 14 can be transmitted. That is, the axial force transmission column 1
1 receives an axial force so as to expand and contract in the axial direction, but the expansion and contraction can be dealt with without any trouble by elastic deformation of the cushioning material 16. Further, the cushioning material 16 can also serve as a form when placing the concrete 24 inside the steel pipe 12.

Therefore, when the axial force transmission column 11 of this embodiment is applied to a building structure, the merit of the steel pipe concrete structure can be effectively utilized. That is, by transmitting only the axial force without transmitting the bending moment to the axial force transmitting column 11, the concrete strength of the axial force transmitting column 11 can be sufficiently exerted. As a result, the axial force transmission column 11 can have a small cross section, and the space of the building structure can be effectively used.

Further, since the cushioning material 16 is fixed to the connecting metal piece 17, the cushioning material 16 can be easily attached to the steel pipe 12 and the cushioning material 1
When 6 is directly fixed to the steel pipe 12, it is possible to eliminate the risk of a work problem such as the cushioning material 16 coming off when the steel pipe 12 is handled.

In the present embodiment, the steel pipe 12 has a circular tubular shape, but the shape is not limited to this. For example, the steel pipe 12 may have a rectangular tubular cross section.
The number and arrangement of the axis muscles 21 and the axis hoop muscles 22 that form the hoop muscles 19 and the core muscles 20 can be appropriately changed. Further, the material of the cushioning material 16 can be made of an elastic material other than rubber, and the connecting metal piece 17 can be appropriately changed such as being formed of a material other than metal in a shape other than the inverted U shape.

[0021]

As described above in detail, in the axial force transmission column of the present invention, the cushioning material is sandwiched between the upper end of the steel pipe and the upper slab, and the column bar is provided inside the upper and lower slabs. Since the structure is not buried, even if a load is applied to these slabs in the horizontal direction, such as during an earthquake, the cushioning material will elastically deform and the horizontal load will be applied via the column bars. Since it is not transmitted, it is possible to prevent a bending moment from being generated in the column. Further, the horizontal shearing force and the axial force can be resisted by the core muscles receiving them. In particular, when the core reinforcement is embedded near the center of the cross section of the steel pipe, the bending moment in the column can be more reliably prevented from occurring. Therefore,
When the axial force transmission column of the present invention is applied to a building structure,
Since the concrete strength of the axial force transmission column can be fully exerted, the axial force transmission column can have a small cross section,
The space of the building structure can be effectively used.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an axial force transmission column according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an enlarged view of a cushioning material mounting portion of the axial force transmission column.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a transverse sectional view taken along line BB of FIG.

FIG. 5 is a diagram showing an example of a body of a conventional building structure.

FIG. 6 is a diagram showing another example of a conventional skeleton of a building structure.

[Explanation of symbols]

 11 Axial Force Transmission Column 12 Steel Pipe 13 Lower Slab 14 Upper Slab 16 Cushioning Material 17 Connection Hardware (Connecting Member) 18 Column Reinforcement 20 Core Reinforcement 24 Concrete

Claims (3)

[Claims] 1. A pillar of a steel pipe concrete structure which is erected between a slab on an arbitrary floor and a slab on a floor immediately above the floor in a structure and receives an axial force from these slabs, the lower end of which is a lower side. A steel pipe fixed to the slab and erected between the lower slab and the upper slab, concrete cast inside the steel pipe, and extending in the axial direction inside the steel pipe to be embedded and Lower slabs, column bars arranged so as not to be embedded inside any of the upper slabs, and core bars that are embedded near the lower end and near the upper end inside the steel pipe and penetrate the lower slab and the upper slab, respectively. And an elastically deformable cushioning material sandwiched between a peripheral portion of the upper end of the steel pipe and the upper slab. 2. The axial force transmission column according to claim 1, wherein the core bar is embedded in the vicinity of the center of the cross section of the steel pipe. 3. The axial force transmission column according to claim 1, wherein a connecting member is fitted to a peripheral portion of the upper end of the steel pipe, and the cushioning material is fixed to the connecting member. Axial force transmission column.