JPS62101734A - Packed steel pipe concrete pillar structure - 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 Field of Application] The present invention relates to a filled steel pipe concrete column structure used as a column in a Chichiku Sakaki structure.

[Conventional technology]

Conventionally, a typical filled steel pipe concrete column has a structure in which a simple right cylindrical steel pipe that also serves as a formwork is erected vertically, and concrete is simply poured inside the steel pipe. This structure is a steel pipe filled with concrete, so the steel pipe and concrete are an integral structure as a whole. In addition, conventionally, in the joint part where a beam is joined to a column made of filled steel pipe concrete, a stiffener ring is welded to the outer peripheral surface of the column as an auxiliary member to maintain the rigidity of the column. The beams are made to fit together.

[The problem that the invention attempts to solve]

However, in the above-mentioned conventional filled steel pipe concrete column structure, a beam is simply welded to the outer peripheral surface of the steel pipe, and the stress transmission between the steel pipe and the concrete depends on the adhesive strength of the joint. Therefore, the shearing force of the beam is transmitted as axial stress from the weld between the steel pipe and the steel pipe to the steel pipe, and part of the axial stress transmitted to the steel pipe is due to the axial force of the concrete due to the bond between the steel pipe and concrete. This is also transmitted to concrete. In addition, the moment of the beam is transmitted from the weld between the beam and the steel pipe to the steel pipe as in-plane shear stress, and part of the internal shear stress transmitted to the steel pipe is due to the shear stress from the bonding surface of the steel pipe and concrete to the concrete. It is transmitted as

In this way, in the conventional filled steel pipe concrete column structure, the transmission path of force from the beam to the column is twisted and twisted, and the transmission force is transmitted to the internal concrete from the bonding surface of the steel pipe and concrete. The adhesion strength between the steel pipe and the concrete surface is <g.

Therefore, the steel pipes of the columns are subjected to axial stress, in-plane shear stress, and circumferential stress from the concrete, and are likely to become plastic due to the Mises yield condition.

Therefore, the columns of filled steel pipe concrete column structure are made of steel′
Concrete pressure +I- due to conofinding effect due to U
It is no longer expected that the yield strength will increase as much as when the axial stress and in-plane STM stress are very small, and the design safety factor must be set to an excessive value.
There were disadvantages in that the cross-sectional area of the column became larger than necessary, and the wall thickness of the steel pipe became thicker than necessary.

By the way, recently, the construction of four ultra-high IWi buildings has been rapidly increasing in urban areas. In Japan, in order to build high-rise buildings, column structures must be made flexible for earthquake countermeasures. However, the conventional filled steel pipe concrete column structure has four rigid columns as described above, and is therefore not suitable for the above-mentioned flexible I4 structure skyscraper Diff.

This invention was made in view of the above circumstances, and by introducing a mechanical stress transmission path into the column-beam joint structure and ensuring the flatness of the concrete cross section of the column,
The transmission of force from the beam to the concrete part of the column is smooth, direct, and clear.Furthermore, since the concrete part and steel pipe part of the column are separated, they behave mechanically as separate bodies, allowing the transmission of force from the beam to the column. Most of the force transmitted to the column is borne by the concrete part, and the axial IJ analysis force applied to the steel pipe part of the column is absorbed by the deformation of the deformation absorbing part formed in a part of the steel pipe. In order to prevent axial stress from occurring in the steel pipe, and to take into account the axial stress in the Mises yield condition equation, the conofinding effect brought about by the steel pipe can be used to reduce the cross-sectional area of the column. The purpose is to reduce the wall thickness of steel pipes.

[Means for solving problems]

This invention is a joint part where a column and a beam are joined, and an inner flange-type bearing pressure plate that continues along the inner periphery of the steel pipe is installed inside the steel pipe of the column with an inner wall of concrete filled in the steel pipe. At the same time, the outer circumferential part is fixed to the inner wall of the steel pipe, and a deformation absorbing part is provided on a part of the steel pipe of the column to prevent axial stress from being generated in the steel pipe due to deformation of this part. The present invention is characterized in that an unbonding treatment layer is provided at the interface l1I between the steel pipe and the concrete to which the steel pipe is coated to form an unbonded layer for adhesion between the steel pipe and the concrete.

In this invention, the inner flange type bearing pressure plate is provided with an air vent hole, the inner circumferential portion 1 on the lower surface of the inner flange type bearing pressure plate is inclined upwardly from the outer circumferential side, and the steel pipe is The deformation absorbing portion formed in a portion of the steel pipe may have at least one ring-shaped gap that edges the steel pipe in the axial direction in at least a portion of the steel pipe in the axial direction, or the deformation absorption portion formed in a portion of the steel pipe may be The absorption part is this 4
A plurality of elongated holes extending in IIa rows in the local direction of the G4 pipe are arranged, or a deformation absorbing portion formed in a part of the steel pipe is formed on the outer periphery of at least a part of the G4 pipe in the axial direction. A deformation absorbing portion formed in a portion of the steel pipe may be formed on the inner circumferential surface of at least a portion of the steel pipe in the axial direction. A deformation absorbing portion formed in a portion of the steel pipe, such as a ring-shaped groove that extends, or a deformation absorption portion formed in a portion of the steel pipe,
The pipe is divided into sections, and the end of the sectioned steel pipe has an inner circumferential surface that is substantially concave with the inner circumferential surface of the steel pipe, and has a cylindrical deformation that absorbs deformation in 41 directions that occurs in the steel pipe. An absorbing member is interposed, and this type of absorbing member is made by winding high-strength and high-rigidity fibers into a cylindrical shape, and binding it into one with a solidifying material that has at least lower strength and lower wJ than steel pipes. The deformation absorption part formed in a part of the steel pipe may be formed by bundling, or the deformation absorbing part formed in a part of the steel pipe is provided with a bulge formed by bending the steel pipe outward in the radial direction at a predetermined location in the longitudinal direction of the steel pipe. The bulging portion may be configured to absorb axial deformation of the steel pipe, or the unbonding layer provided at the interface between the steel pipe and the concrete filled in the steel pipe may contain paraffin, asphalt, oil, Grease, Vaseline, etc. are applied to the inner surface of the steel pipe, and the steel pipe is filled with concrete (IJ-). If the concrete filled into the steel pipe is made of mortar, other hydraulic materials, soil, sand, metal powder, glass powder, plastic, clay, etc., the concrete filled in the steel pipe may have sufficient compressive strength. have t
4. It is desirable to use a filling material for relics.

In addition, in this invention, at the joint part where the column and beam are joined,
On the same side of the steel pipe of the above-mentioned column, an inner flange-type dispensing plate is provided that continues around the inner circumference of the steel pipe, and the outer circumference of the plate is fixed to the inner wall of the #4 pipe, and a rib is connected to the bearing pressure plate. At least one plate is provided so as to be continuous with the beam via the steel pipe, and the bearing plate and the ribs are included in the concrete filled in the steel pipe, and an air vent hole is formed in the bearing plate. It is a feature.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a first embodiment will be described with reference to FIGS. 1 to 8. FIG. 1 is a diagram showing a general outline of the filled steel pipe concrete column structure of the present invention. In the figure, the symbol l is a pillar of the light jlL1 af4 pipe concrete pillar structure (hereinafter abbreviated as "pillar"), and the pillar! , l, ... has f
f12,2. . . . are connected at the joint portion 3° 3, . In addition, near the approximate middle part of l1l- of the columns 1, λ, . . . (moment recursion point), the columns 1, 1.
Steel pipes 4, 4. The deformation absorbing portions 5, 5, .・・・
・is formed.

Furthermore, this pillar l, 1. Steel pipes 4, 4. The inside of ... is filled with concrete 6, which will be described later.
Between the boundary between the steel pipe 4 and the concrete 6, an unbonding process No. 7 Tl1ff is applied to eliminate the addition of the steel pipe 4 and the concrete 6, which will be described later. The unbonding layer 7 is formed by applying a separation material such as paraffin, asphalt, oil, grease, vaseline, etc. to the inner surface of the 8-tube 4.

Next, using Fig. 2 and '+S6, we will explain the structure of the joint part 3 of the column l, that is, the part where the beam 2 is joined.The joint part 3 consists of mW4 which also serves as a formwork, It consists of a beam 2 fixed to the steel pipe 4, ring-shaped bearing plates 8, 8 provided inside the steel pipe 4, and concrete 6 filled inside the steel pipe 4 including the bearing pressure &8, 8. In addition, between m#4 and concrete 6, ANOBOND treatment/1 is applied.
7 is provided.

The beam 2 has upper and lower 7 ridges 2a, 2a, and lateral ridges.

The web 2b is welded to the outer peripheral surface of the steel pipe 4 and supported horizontally. In addition, the bearing pressure plate 8
is ring-shaped and has an outer diameter equal to the inner diameter of the steel pipe 2, and is welded to the inner circumferential surface of the steel pipe 2 with each outer circumference at the same height as the flange 2 of the beam 2. Fixed. The outer circumferential portion of the bearing pressure plate 8 has a plurality of air vent holes 9, 9. ... is formed.

Here, a method of constructing the pillar 1 having the above-mentioned joint structure will be explained using FIGS. 1 and 4. For example, the steel pipe 4 is
As shown in the figure, a structure with a height of several stories is attached to a steel beam f4 at a required position in the width direction with beams 2, 2, . ...is fixed and erected at the construction site. After the above-mentioned steel pipe 4 is erected, it is filled with concrete according to the procedure described later to construct columns 1, 1゜, etc., and later another steel pipe 4 is connected on top of the above-mentioned column l. One frame of the 1mIt4A building was constructed by repeating the work of filling with red and concrete. Also, Unbondokoro J! In 11117, a separating material is applied to the inner surface of the steel pipe 40 before filling with the concrete 6.

In order to construct the column l by filling concrete into the erected steel pipe 4 described above, as shown in Figure 4, the tremie pipe 10 is 4
Insert it into the inner bottom of the concrete 6 and start pouring the concrete 6. In the above-mentioned work of inserting the tremie pipe IO, since the tremie pipe 10 can be inserted into the inner central part of the steel pipe 4 by passing through the inside of the bearing plate 8, the concrete 6 can be inserted into the Vg of A'f14.
It is possible to fill the concrete 6 from the center, making it possible to fill the concrete 6 uniformly. In addition, the bearing plate 8 has a thick inner diameter (because it can be removed, it is possible to use a large-diameter tremie pipe, and it is therefore more efficient (can be filled with concrete. The filling operation is carried out by gradually pulling up the tremie pipe IO while maintaining an appropriate cover thickness so that the tip of the tremie VIO does not come out of the concrete 6, as shown in FIG.

Here, the concrete 6 filled into the steel pipe 4 by the tremie pipe 10 approaches the bearing plate 8, and further
When the bearing plate 8 is surrounded as shown by the dotted chain line, the concrete 6 forms Ti4 in the center of the steel pipe 4 and increases its beak as it climbs up. Concrete 6 is sufficient (1) There is a risk of creating areas where the concrete does not reach.However, bearing pressure Jf
Outside f of 8,! 5 part f is air vent hole 9, 9. ... is provided outside the bearing plate 8! @The air on the lower surface side is vented through air vent holes 9, 9. Concrete 6 then fills the air vent holes 9°9, . . . , and the bearing plate 8 is completely surrounded by concrete 6. In Konoyo 5,
Air vent hole 9,9. Due to the presence of ..., the bearing plate 8 can be completely contained in the concrete 6 when filling the concrete 6, and it is possible to construct a column 1 having a joint part 3 with severe defects such as air bubbles. can.

In addition, the bearing pressure plate 8 can be fixed inside the steel pipe 4 by making only its outer peripheral part F1 class inside the 14 pipe 40.
There are few welding points and bath welding work is easy.

Next, a modified example of the bearing pressure plate 8 will be explained using FIGS. 5 and 6. In the case of this example, the outer peripheral part of the ring-shaped bearing pressure tJj8a is joined to the inner wall of the steel pipe 4 in the joint part 3, and this bearing pressure plate 8& is connected to the concrete 6 filled in the steel pipe 4.
I try to include it inside. The bearing pressure plate 8a has an inner peripheral side inclined upwardly than an outer peripheral side, and the bearing pressure plate 8a
A itself is shaped to contract upward.

The angle of inclination θ of this bearing plate 8& is set to match the inclination of the surface shape of the concrete 6 during pouring into the steelwork 4. That is, the concrete 6 poured into the steel pipe 4 from the tremie pipe lO inserted into the center of the steel pipe 4
As shown by the solid line and two-dot chain line in FIG. 5, the surface shape of the steel pipe 4 is such that the portion closer to the inner wall of the steel pipe 4 is inclined downward, and the bearing pressure &8& itself is inclined in accordance with the inclination.

The surface shape of the concrete 6 within the steel pipe 1 is predicted based on the results of a slump test, which tests the hardness of concrete.

Therefore, Kffl in mf4 having this bearing plate 8a
When pouring concrete 6, a ring-shaped bearing plate 8a is used.
through the center of the tremie tube]O through the center of the steel pipe 4 (φ
The concrete 6 can be cast evenly (and evenly) from the center of the steel pipe 4 to the entire interior of the steel pipe 4.

Furthermore, the concrete 6 in the middle of being poured into the steel pipe 4
Since the bearing pressure plate 8a is inclined in accordance with the 0-surface shape, there is no fear that a void will be formed below the bearing pressure plate 8sL, and the concrete 6 can be filled satisfactorily. Further, in the unbonding process 1-7, a separation material is applied to the inner surface of the copper pipe 4 before filling with the concrete 6.

By the way, the magnitude of the inclination angle θ of the bearing pressure plate 8a is preferably as large as possible than the inclination of the surface of the concrete 6 during pouring, within a range that does not impair the function of the bearing pressure plate 8a. Furthermore, in consideration of the flow of the concrete 6 as indicated by the arrow in FIG. 5, it is also possible to set the inclination angle θ of the bearing plate 8a to be smaller than the inclination angle of the concrete 60 during pouring. be. Further, at least the lower part of the bearing pressure plate 8a may have an inclination of 4. J& may be such that the inner circumferential side of the lower surface of the bearing pressure plate 8& is more inclined upward than the outer circumferential side.

Note that the shape of the column 1 made of the steel pipe 4 is
The cross section is not limited to a circular shape, but may be arbitrary; for example, as shown in FIG. 7, the cross section may be rectangular, hexagonal, or other polygonal shape.

Further, the shape of the bearing pressure plates 8, 8& is not limited to only an annular shape, but may have a shape corresponding to the cross-sectional shape of the column, as shown in FIG. 7, for example. In short, any inner flange shape may be used as long as it is continuous along the inner circumference of the steel pipe 4 and exists in the filling concrete 6 within the steel pipe 4.

Above, we have described the structure and construction method of the joint part 3 on the ball of column l, but for the sake of brevity, we will briefly explain the structure and construction method of column 1, l,... using Fig. 8.
Deformation absorbing portions 5, 5. formed in the steel pipe 4 near the approximate center of the story. O to explain the structure of... Four stages of ring-shaped gaps 12 are formed at predetermined locations in the axial direction of the steel pipe 4 to edge the steel pipe 4 in the axial direction. This portion constitutes a deformation absorbing portion 5 that absorbs axial deformation occurring in the steel pipe 4. Each ring-shaped gap 12 of this deformation absorbing portion 5
Inside, a flexible material 13 is placed with the inward side facing the inner surface of the steel pipe 4 and the dark side.
is filled. As the flexible material 13, asphalt, rubber, lead, aluminum, etc., which are softer than the steel pipe 4, can be used. Furthermore, an a/bond treatment 1-7 is provided between the steel pipe 4 and the concrete 6.

Next, an explanation will be given of the effect when a force is applied from the beam 2 to the column 1 of the filled steel pipe concrete column structure configured as described above.

1 to 7, the shearing force acting mainly on the web 2a of the beam 2 is transmitted via the steel pipe 4 to the bearing plates 8 (8a), 8
(8a). Bearing plate 8 (8a), 8 (8m)
The shear forces transmitted to the concrete 6 are transmitted as other forces to the concrete 6 containing them. In this way, the shear force of the beam 2 is directly transmitted through the bearing plates 8 (8a), 8 (8a), which are mechanically connected to the web 2 & through the steel pipe 4, that is, through the mechanical transmission path. is transmitted to the concrete 6. Therefore, the steel pipe 4 is not subjected to much shearing force from the beam 2. Furthermore, even if the steel pipe 4 receives some of the shearing force from the beam 2, the steel pipe 4 and the concrete 6
Since an unbonding treatment layer 7 is provided between them, the steel f4 and the concrete 6 are in an unbonded (separated) state, and they can move relative to each other in the axial direction of Note 1. be.

Here, when the concrete 6 is compressed and exceeds a predetermined strength, the concrete 6 undergoes strain in the axial direction and sudden transverse strain in the radial direction. However, steel pipe 4
is not restrained by the concrete 6 in the axial direction at all, and the strain in the axial direction of the steel pipe 4 is absorbed by the deformation of the deformation absorbing part 5, and 1.
The transmission of stress in eight directions is eliminated, and almost no stress in the axial direction is generated in the steel pipe 4. Therefore, if Mises yield condition 1j is used, the (yield strength increases) against the stress in the circumferential direction generated in the W4 pipe 4 due to the transverse strain of the concrete 6,
The confining effect given to the concrete 6 can be enhanced. Therefore, this column l is guaranteed to have a much higher compressive strength than the conventional one,
It is possible to appropriately set the design safety factor. Also,
Since the cross-sectional area of the column 1 is often determined by the cross-section of the joint part 3, it is possible to make the cross-section of the column l smaller, or the wall thickness of the steel pipe 4 can be made thinner. It is.

Next, a second embodiment will be described using FIGS. 1 to 7 and FIG. 9. In the embodiment shown in FIG. 9, the deformation absorbing portion 50 portion of the column 1 of the first embodiment is configured as follows. The steel pipe 4 has a long hole 1 with a diagonal number in the circumferential direction.
4,14. ... are arranged in a staggered manner, and the upper and lower elongated holes 14, 14 . The ends of... are wrapped by a dimension e in the circumferential direction, and the elongated holes 14, 14. ...
The portion where is not formed is continuous in the circumferential direction.@Also, an unbonding treatment layer 7 is provided around the inner circumference of the steel pipe 40. The rest of the structure is the same as in the first embodiment, and the same components are given the same reference numerals. Therefore, in this second embodiment as well, The strain is absorbed by the deformation of the deformation absorbing portion 5, and the same effects and effects as in the first embodiment can be obtained.

Next, a third embodiment will be explained using FIGS. 1 to 7 and FIG. 10. In the embodiment shown in FIG. 10, a steel pipe 40
A ring-shaped groove 15 extending in the circumferential direction is formed. In the secondary direction of the steel pipe 4, ring-shaped grooves 15, 15 . ...
are formed in four stages, and this portion constitutes a deformation absorbing portion 5 that absorbs axial deformation occurring in the steel pipe 4. The width and the number of stages of the groove/groove 15 of the deformation absorbing portion 5 are set excessively according to the design conditions, and the thickness of the thin wall part of the groove/groove 11/15 portion is determined by placing the steel pipe 4 in the upper layer. It is set so that it has the strength during construction when assembling each floor, and the strength as a formwork when concrete is placed inside the steel pipe 4.

Further, an unbonding treatment no. 7 is provided on the inner circumferential surface of the steel pipe 4. The rest of the structure is exactly the same as that of the first embodiment, and the same four components are given the same reference numerals.

Therefore, in this sixth embodiment as well, the strain in the axial direction of the steel pipe 4 is absorbed by the deformation of the deformation absorbing part 5, and the transmission of axial stress between the upper and lower parts of the deformation absorbing part 5 is eliminated, and the strain in the axial direction of the steel pipe 4 is absorbed. Almost no axial stress occurs in
It is possible to obtain the same functions and effects as in the above-mentioned first example.

Next, a fourth embodiment will be described using FIGS. 1 to 7 and FIG. 11. In the embodiment shown in FIG. 11, this @4
A ring-shaped groove 16 extending in the circumferential direction is formed on the inner circumferential surface of the tube 4. Four stages of ring-shaped rings 1416 extending in the circumferential direction of the steel pipe 4 are formed on the inner circumferential surface of A′α4, and this portion constitutes a deformation absorbing portion 5 that absorbs axial deformation occurring in the steel pipe 4. .

The thickness of the thin wall portion of the ring-shaped groove 16 of the deformation absorbing portion 5 is determined by the strength at the time of assembling the upper layer of the material 4, and the type at the time of pouring concrete into the inside of A'94. Set it so that it has strength as a frame. Further, the inner peripheral surface of the example tube 4 is provided with an ad/send treatment layer 7, and the ring-shaped groove 16 is also filled with a separating material as a flexible material. The rest of the structure is exactly the same as that of the first embodiment, and the same components are denoted by the same reference numerals.

Therefore, in this fourth embodiment as well, the strain in the axial direction of the steel pipe 4 is absorbed by the early buckling of the thin wall portion of the ring-shaped groove 16 of the deformation absorbing portion 5.
There is no transmission of axial stress between the upper and lower parts of the steel pipe 4.
Almost no axial stress is generated, and the same operation and effect as in the first embodiment can be obtained.

Next, a fifth embodiment will be described using FIGS. 1 to 7, and FIGS. 12 and 13. The embodiment shown in FIG. 12 is based on the A (shaped absorption part 50
The shoulder 'θ4 is divided in the axial direction at a predetermined point in the axial direction, and between the ends of the divided 'aI4 pipe 4, there is a piece of steel 'a4. Almost the same as the inner diameter
A cylindrical deformation absorbing member 17 having an inner diameter and absorbing axial deformation occurring in the steel pipe 4 is interposed. As shown in FIG. 12, the deformation absorbing member 17 is made by winding high-strength and high-rigidity fibers 18 into a cylindrical shape, and solidifying them into a material having at least lower strength and lower Ii properties than the steel pipe 4. The material 19 is made of rubber, vinyl chloride, PEEK resin, etc., and is integrally bound and molded so as not to come undone. Therefore, although it deforms in the axial direction, it hardly deforms in the circumferential direction or radial direction, and has sufficient restraint strength and rigidity.

The deformation absorbing portion 5 is connected to the steel pipe 4 by step-shaped notches on the outer circumferential surface of the upper and lower ends of the deformation absorbing portion 5, and step-like notches on the inner circumferential surface of the end portion of the steel t4. This is achieved by mutually inserting each end of the steel pipe 4 and the deformation absorbing member 17 into the cutout. In this case, the deformation absorbing member 1
The thickness and length of 7 should be set according to the strength of 4g4 and the magnitude of deformation occurring in the steel pipe 4. Also, the inner circumference lK of the steel pipe 4 is unbonded! -7 is provided.

The other configurations are exactly the same as the first embodiment,
Identical components are given the same reference numerals.

Therefore, in this fifth embodiment as well, the axial strain occurring in the steel #4 is absorbed by the deformation absorbing portion 5, and the transmission of axial stress between the upper and lower portions of the deformation absorbing portion 5 is eliminated.
Almost no axial stress is generated in the steel pipe 4, and the same functions and effects as in the first embodiment can be obtained.

Next, using Figures 1 to 7 and Figure 14, @6
An example will be explained. In the embodiment shown in these figures, the deformation absorbing portion 50 of the column l of the first embodiment is configured as follows. At a predetermined location in the longitudinal direction of the steel pipe 4,
A bulging portion 20 is formed by bending and deforming the steel pipe outward in the radial direction. This bulging portion 20 absorbs the axial deformation that occurs in the -pipe 4 due to bending of the iron plate. A soft material 22 is packed inside the bulge 20 to prevent concrete from entering the sub-space 21 inside the bulge. Furthermore, an unbonding treatment layer 7 is provided around the inner periphery of the steel pipe 4. The rest of the configuration is exactly the same as that of the first embodiment, and the same components are denoted by (η1-).

Therefore, the axial strain that occurs in the steel pipe 4 is caused by the bulge 20
As a result, there is no transmission of axial stress between the upper and lower portions of the bulging portion 20 (therefore, almost no other direction stress is generated in the I tube 4, and the same operation and effect as in the first embodiment of the upper Ik3 is achieved. Obtainable.

Here, in the first to sixth embodiments, FIG.
A seventh embodiment in which the joint section 3 shown in FIG. 6 is applied will be described. Components that are the same as those of the first embodiment shown in FIGS. 2 and 3 are designated by the same reference numerals, and the description thereof will be omitted. The connection part 3 of this chestnut is shown in Fig. 2.
M2. 2. + to the web 2 of...
, 2b, . . . and continuous ribs 23, 23 . ... are provided, and this rib 23 is fixed to one of the bearing plates 8, 8 and the steel pipe 4, and this rib 23, 23 . ... is included in the filled concrete 6. In this case, it is possible to provide an unbond treatment between the LA steel pipe and the concrete 6.Next, the operation of the joint portion 30 of the above configuration will be explained. The shearing force acting on the webs 2a, 2a, .
3 and bearing plates 8, 8, that is, along a mechanical transmission path, directly onto the concrete 6.

Therefore, in the joint section 3 of this example, the rigidity of the bearing pressure plates 8, 8 provided with the ribs 23 is increased compared to the joint section 3 shown in the first to sixth embodiments. , the flatness of the concrete cross section can be maintained more reliably, and the transmission of the sword from the beam 2 to the concrete IJ -) 6 part can be made smoother, 1 inch and 4' clearer, and It is possible to obtain the same functions and effects as the first to sixth embodiments described above.

Furthermore, note 1 of the structure in the first to seventh embodiments described above is that the cross-sectional area of the pillar can be reduced, so His mainstay is Jyoyo OT Noh. Here, high-rise buildings are representative of flexible structures. The skyscraper is
When a building is photographed due to an earthquake, etc., it bends to absorb the damage and prevent the building from collapsing. In such high-rise buildings, the conventional filled steel pipe concrete column structure is undesirable because the cross section of the building becomes thick (and the structure becomes rigid). is suitable for application to skyscrapers.

In each of the above embodiments, the steel pipe 4 was filled with concrete 6, but instead of concrete, mortar, other hydraulic materials, soil, sand, metal powder, glass powder, plastic, clay, etc. This may be replaced by a structural filler having a cylindrical compaction capacity. Furthermore, it is optional to increase the strength of the concrete by inserting reinforcing bars into the concrete 6 or arranging prestressed steel.

〔Effect of the invention〕

As mentioned above, the filled A-tube concrete column structure according to the present invention (according to the present invention) has the same flange that extends and continues on the inner circumference of the steel pipe inside the steel pipe of the column at the joint part where the column and the beam are joined. A bearing pressure plate of the type is included in the concrete filled in the above @4 pipe, and its outer peripheral part is fixed to the inner wall of the /JII4 pipe, and this part is deformed to a part of the steel pipe of the above column. This forms a deformation absorbing part to prevent axial stress from being generated in the steel pipe, and at the same time, the interface between the steel pipe and the concrete filled with the steel pipe is used to prevent adhesion between the steel pipe and the concrete. Since it is equipped with an undone treatment 1-, it is possible to ensure that the column's concrete 17-) plane is maintained flat, and the majority of the force transmitted from the beam to the column is transferred smoothly and directly to the concrete cross section of the column. Furthermore, since the concrete part and the steel part of the column are separated, they are made to behave mechanically as separate bodies, and most of the force transmitted from the beam to the column is borne by the concrete part. At the same time, the axial shearing force applied to the steel pipe section of the column is absorbed by the deformation of the deformation absorbing section formed in the -q section, thereby preventing the generation of axial stress on the steel pipe. , Mises' terms of surrender′? : It is fully expected that the compressive strength of concrete will increase due to the confining effect brought about by increasing the stress bearing capacity in the circumferential direction of the steel pipe if it is accepted, and the cross-sectional area of the column will be increased. It is possible to make the steel pipe smaller and the wall thickness of the steel pipe thinner. Also, the bearing plate of the joint part is only on the outer periphery!
It can be easily fixed by simply welding it to the steel pipe, and when pouring concrete inside the steel pipe, it is possible to pour concrete through a large diameter tremie pipe in the center of the steel pipe. Concrete can be placed uniformly and efficiently within the concrete.

[Brief explanation of drawings]

1 to 16 are diagrams showing embodiments of the present invention. Fig. 1 is a front view showing an outline of the invention, Fig. 2 is a plan view showing the location of the joint in Fig. 1, and Fig. 6 is a front view showing the outline of the invention.
Figures 1 and 4 show the method of filling the steel pipe with concrete using a tremie pipe as shown in Figure 2. Figure 5 shows a modified example of the bearing plate at the joint shown in Figure 2. 6 is a sectional view taken along line M-w in FIG. 5, FIG. 7 is a sectional view of a column having a square cross section, and FIG. FIG. 9 is a partial cross-sectional view of the deformation absorbing portion, and FIG. 10 is a partial cross-sectional view of the deformation absorbing portion.
FIG. 1 is a partial cross-sectional view of the deformation absorbing part, the first
1 is a diagram showing the fourth embodiment, and is a partial cross-sectional view of the deformation absorbing part, FIG. 12 is a diagram showing the fifth embodiment, and is a concave view of the location of the deformation absorbing part. FIG. 12 is a perspective view of the deformation absorbing member, FIG. 14 is a diagram showing the sixth embodiment, and FIG. 15 is a diagram showing the location and opening of the deformation absorbing part, and FIG. The vertical #r side view of the section, Figure 16 is the 15th
It is a cross-section (2) of the figure. 1...Column (former JAM pipe concrete pillar structure)
, 2... Beam, 3... Shiguchi section, 4...
・・・Steel pipe, 5...'R type absorption part, 6...
...Concrete, 7...No unbonding treatment, 8...Bearing plate, 9...Air vent hole,
10... Tremy tube, 12... Ring-shaped gap, 13... Flexible material, 14... Elongated hole, 15, 16... Ring-shaped groove, 17...
...Deformation absorbing member, 18...Fiber, 19...
...Solidifying material, 20...Bulging part, 23...
··rib.

Claims (14)

[Claims] (1) In a filled steel pipe concrete column structure, at the joint part where the column and beam are joined, an inner flange-type bearing plate that continues along the inner circumference of the steel pipe is installed inside the steel pipe of the column. It is contained in the concrete filled in the steel pipe, and its outer layer is fixed to the inner wall of the steel pipe, and furthermore, when this part deforms, axial stress is applied to the steel pipe. In addition to forming a deformation absorption part to prevent this from occurring, an unbonding treatment layer was provided at the interface between the steel pipe and the concrete filled in the steel pipe to eliminate adhesion between the steel pipe and concrete. Features a filled steel pipe concrete column structure. (2) The filled steel pipe concrete column structure according to claim 1, wherein the inner flange type bearing pressure plate is provided with an air vent hole. (3) The filled steel pipe concrete column structure according to claim 1, wherein the circumferential side of the lower surface of the inner flange type bearing plate is inclined upwardly than the outer circumferential side. (4) The deformation absorbing portion formed in a portion of the steel pipe is characterized in that at least one ring-shaped gap is provided in at least a portion of the steel pipe in the axial direction to edge the steel pipe in the axial direction. A filled steel pipe concrete column structure according to claims 1 to 3. (5) Claim 1, characterized in that the deformation absorbing portion formed in a portion of the steel pipe is provided with a plurality of long holes extending in plural rows in the circumferential direction of the steel pipe. to the filled steel pipe concrete column structure described in item 3. (6) The deformation absorbing portion formed in a portion of the steel pipe is characterized in that a ring-shaped groove extending in the circumferential direction is formed on at least a portion of the outer peripheral surface of the steel pipe in the axial direction. A filled steel pipe concrete column structure according to claims 1 to 3. (7) The deformation absorbing portion formed in a portion of the steel pipe is characterized in that a ring-shaped groove extending in the circumferential direction is formed on the inner peripheral surface of at least a portion of the steel pipe in the axial direction. A filled steel pipe concrete column structure according to claims 1 to 3. (8) The deformation absorbing portion formed in a portion of the steel pipe divides the steel pipe into two in the axial direction, and the end of the bisected steel pipe has an inner circumferential surface that is substantially flush with the inner circumferential surface of the steel pipe. A cylindrical deformation absorbing member is interposed to absorb the axial deformation occurring in the steel pipe. The filled steel pipe concrete column structure according to any one of claims 1 to 6, characterized in that it is integrally formed with a solidifying material having lower strength and rigidity. (9) The deformation absorbing portion formed in a portion of the steel pipe includes a bulge formed by bending and deforming the steel pipe radially outward at a predetermined location in the longitudinal direction of the steel pipe, and the bulge is formed by bending and deforming the steel pipe outward in the radial direction. Claims 1 to 3 are characterized in that the steel pipe is configured to be able to absorb axial deformation of the steel pipe.
Filled steel pipe concrete column structure as described in section. (10) The unbonding treatment layer provided at the interface between the steel pipe and the concrete filled in the steel pipe is obtained by applying a separation material such as paraffin, asphalt, oil, grease, or petrolatum to the inner surface of the steel pipe. A filled steel pipe concrete column structure according to any one of claims 1 to 9. (11) The filled steel pipe concrete column structure according to any one of claims 1 to 10, wherein reinforcing members such as reinforcing bars are provided in the concrete filled in the steel pipe. (12) Claim 1, characterized in that prestress is introduced into the concrete filled in the steel pipe.
Filled steel pipe concrete column structure according to items 1 to 10. (13) A structure that has sufficient compressive strength if the concrete filled in the steel pipe is compacted with mortar, other hydraulic materials, soil, sand, metal powder, glass powder, plastic, clay, etc. The filled steel pipe concrete column structure according to any one of claims 1 to 10, characterized in that the filled steel pipe concrete column structure is a filler for use as a filler material. (14) In a filled steel pipe concrete column structure, at the joint part where the column and the beam are joined, an inner flange type bearing plate is provided inside the steel pipe of the column that continues along the inner circumference of the steel pipe,
The outer periphery thereof is fixed to the inner wall of the steel pipe, and at least one rib connected to the bearing plate is provided so as to be continuous with the beam via the steel pipe, and the bearing plate and the ribs are further filled in the steel pipe. A filled steel pipe concrete column structure characterized in that the concrete is contained in the concrete and air vent holes are formed in the bearing plate.