JPH0353419B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to the structure of a filled steel pipe concrete column.

[Conventional technology]

A conventional filled steel pipe concrete column is simply a steel pipe filled with concrete, so the steel pipe and concrete have an integral structure as a whole. In addition, conventionally, the structure of the joint between such a filled steel pipe concrete column and the beam connected to the column, that is, the joint, was to attach a stiffener ring to the outer surface of the steel pipe and weld the beam to this stiffener ring. There are known devices that ensure rigidity.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional filled steel pipe concrete column, the steel pipe and concrete are integrated, and at the joint, the beam is simply welded to the outer circumferential surface of the steel pipe, so that there is no effect on the beam. The vertical load is first transmitted to the steel pipe, and then transferred to the concrete due to the adhesive force between the steel pipe and the concrete.

Therefore, the steel pipe is subjected to compressive force in the axial direction, causing strain, and when this strain becomes large, the steel pipe may exceed the Mises yield condition or cause local buckling. In this case, we cannot fully expect the confining effect of the steel pipe (an effect that increases the proof strength of concrete by tightening the concrete to prevent it from expanding outward due to the circumferential stress of the steel pipe). As a result, there was no hope of increasing the strength of the concrete, and the problem was that the pillars had to have a larger cross-sectional area than necessary.

In order to solve the above-mentioned Shiguchi problem, the applicant:
Previously, we provided a joint structure as shown in FIGS. 7 and 8. This means that the webs 8a to 8 of the beams 5a to 5d are placed inside the steel pipe 2 at the positions where the beams 5a to 5d are joined.
Steel plates 3a, 3b, and 3c are attached so as to be continuous with 8d.

According to this structure, the load applied to the beams 5a to 5d is transmitted through the steel pipe 2 to the steel plates 3a, 3b, and 3 in the steel pipe 2.
c, and is transmitted from these steel plates 3a, 3b, and 3c to concrete 4. That is, the vertical load is directly transmitted to the concrete 4, and the steel pipe 2 receives almost no axial stress. Therefore, the steel pipe 2 will not exceed the Mises yield condition or cause local buckling, and will be able to fully exhibit the comfort effect, and can be expected to sufficiently increase the yield strength of the concrete 4. Therefore, it is possible to reduce the cross-sectional area of the pillar 1.

However, in this structure, since the steel plates 3a, 3b, and 3c are provided inside the steel pipe 2 at the joint part, when filling the concrete 4 into the steel pipe 2 using a tremie pipe, teeth,
The concrete 4 to be filled is filled with steel plates 3a, 3b, 3
The problem remains that the steel pipe 2 is not uniformly filled due to obstructions caused by the concrete 4, and there is a possibility that voids may be formed in the filled concrete 4. Moreover, although it is true that the load applied to the beam is directly transmitted to the concrete 4 by the steel plates 3a, 3b, and 3c,
Since the concrete 4 is integrated with the steel pipe 2, the axial force applied to the steel pipe 2 is not completely cut off, and axial stress is still generated on the steel pipe 2, which reduces the confining effect. There were also some problems.

This invention was made in view of the above circumstances, and can be fully expected to enhance the confining effect of steel pipes and increase the compressive strength of concrete, reduce the cross-sectional area of columns, and allow concrete to be spread uniformly and uniformly into steel pipes. It is an object of the present invention to provide a structure of a filled steel pipe concrete column that can be reliably filled and thereby reliably exhibit the above-mentioned effects.

[Means for solving problems]

The present invention is a structure of a filled steel pipe concrete column in which a steel pipe is filled with concrete,
At the joint part where the steel pipe and the beam are connected, at least one plate is included in the concrete and protrudes in the radial direction of the steel pipe, extends in the axial direction of the steel pipe, and is included in the concrete. A steel plate is provided to be connected to the inner wall of the steel pipe so as to be continuous with the beam, and the space inside the steel pipe separated by the steel plate is horizontally communicated with each other, and the concrete to be filled is passed through the steel plate. At least one communicating hole for
A deformation absorbing part is formed in 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, and the steel pipe and the steel pipe are The feature is that an unbonding layer is provided at the interface between the steel pipe and the concrete to prevent adhesion between the steel pipe and the concrete.

[Effect]

According to this invention, the load applied to the beam is directly and clearly transmitted to the concrete by the steel plate. At that time, since the concrete and steel pipe are in an unbonded state (non-adhesive state), the axial force transmitted to the concrete can be prevented from being transmitted to the steel pipe, and the axial stress generated in the steel pipe can be prevented. is absorbed by the deformation of the deformation absorbing section. In addition, when filling concrete into a steel pipe using a tremie pipe, the concrete to be filled flows through the communication hole formed in the steel plate, and the concrete can sufficiently go around the space surrounded by the steel plate where the tremie pipe does not pass through. .

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1, FIG. 2 are diagrams showing a first embodiment of the present invention, FIG. 3, FIG. 4 are diagrams showing a second embodiment of the invention, and FIGS. FIG. 2 is a diagram showing the present invention being used in an actual building.

First, a first embodiment shown in FIGS. 1 and 2 will be described. In Figures 1 and 2, the 7th
Components that are the same as those shown in FIG. 8 are designated by the same reference numerals. These figures show a joint structure of a filled steel pipe concrete column, and the symbol A indicates a filled steel pipe concrete column. Filled steel pipe concrete column (hereinafter simply referred to as “column”)
A steel pipe 2 that also serves as a formwork, steel plates 3a, 3b, and 3c that are inside the steel pipe 2 and are orthogonal to each other, and a steel plate 3
It consists of a concrete 4 filled inside a steel pipe 2, which includes concrete 4, 3a, 3b, and 3c. Said steel plate 3
As shown in the figure, a, 3b, and 3c protrude in the radial direction of the steel pipe and extend in the axial direction of the steel pipe 2. The column A has a beam 5a on the outer peripheral surface of the steel pipe 2,
5b, 5c, and 5d are installed by welding.
Beams 5a, 5b, 5c, 5d are horizontally arranged flanges 6a, 6b, 6c, 6d and 7a, 7b, 7
c, 7d and webs 8a, 8b, 8c, 8d arranged vertically between them. Beam 5
The webs 8a and 8b of the beams 5c and 5b are connected to the steel plate 3a via the steel pipe 2, and the webs 8c and 8d of the beams 5c and 5d are connected to the steel plates 3b and 3c via the steel pipe 2.

In addition, the joint part includes a steel pipe 2 and steel plates 3a, 3.
Space portions 9a, 9b, 9 defined by b, 3c
c, 9d are formed. Furthermore, communication holes 10a and 10b that communicate the spaces 9a and 9b and communication holes 10c and 10d that communicate the spaces 9c and 9d are formed in the steel plate 3a in the thickness direction of the plate. Similarly, the steel plate 3b has communication holes 10e and 1 that communicate the spaces 9a and 9d in the thickness direction of the plate.
0f is formed in the steel plate 3c, and a communication hole 1 is formed in the thickness direction of the steel plate 3c to communicate the spaces 9b and 9c.
0g and 10h are formed.

Further, inside the steel pipe 2, a tremie pipe 11a that passes through the space 9a and is filled with concrete 4, and a tremie pipe 11b that passes through the space 9c and is filled with concrete 4 are installed.
Here, FIG. 5 shows the state in which this column is used in an actual building. In Fig. 5, numerals 26, 26, ... are filled steel pipe concrete columns, 27, 27, ... are beams, and 2
8, 28, ... are the joint parts of the pillars. Pillar 26,2
A plurality of slits (deformation absorbing portions) 30, 30, . . . extending in the circumferential direction are provided in the steel pipe 2 portions near the intermediate portions 29, 29, . . . of the floors 6, .

Further, as shown in FIG. 6, an unbonding treatment layer 21 is provided between the steel pipe 2 of the column 26 and the concrete 4 inside to unbond the steel pipe 2 and the concrete 4 to each other. is formed.

In this configuration, the shearing force acting mainly on the webs 8a, 8b of the beams 5a, 5b is transmitted from the beams 5a, 5b to the steel plate 3a inside the steel pipe 2 via the steel pipe 2,
Furthermore, it is transmitted from the steel plate 3a to the concrete 4 containing the steel plate 3a. By transmitting the shearing force of the beams 5a, 5b to the steel plate 3a in the steel pipe 2 on the extension line of the webs 8a, 8b in this way, the beams 5a, 5b
The shearing force of 5b can be directly transmitted to the concrete 4 as an axial force of the concrete 4. Similarly, the shearing force acting on the webs 8c, 8d of the beams 5c, 5d can also be directly transmitted to the concrete 4 as axial force of the concrete 4 via the steel plates 3b, 3c in the steel pipe 2. The axial force transmitted to the concrete 4 is hardly transmitted to the steel pipe 2 because the concrete 4 and the steel pipe 2 are in an unbonded state. In addition, the axial force directly applied to the steel pipe 2 from the beam 27 is
Since the slits (deformation absorbing portions) 30, 30, . . . absorb the stress by deforming, almost no axial stress is generated in the steel pipe. As a result, when applying the Mises yield condition, there is a margin in the allowable value for the circumferential stress generated in the steel pipe 2 due to the transverse strain of the concrete 4,
Therefore, the column 26 is guaranteed to have a much higher compressive strength than the conventional column, and its cross-sectional area can be reduced.

When pouring concrete 4 into the steel pipe 2, the tremie pipes 11a and 11b are inserted into the steel pipe 2, and the tremie pipes 11a and 11b are sequentially pulled up from the bottom of the steel pipe 2 toward the top at a predetermined speed. At the same time, concrete 4 is filled from the tips of the tremie pipes 11a and 11b and poured into the steel pipe 2. Here, in this column A, the tremie pipe 11 is filled with concrete 4 in the space 9a of the joint part.
When a passes through, concrete 4 is placed inside the space 9a.
Filled with concrete 4
flows out into the space 9b from communication holes 10a, 10b formed in the steel plate 3a, and flows into the space 9d from communication holes 10e, 10f formed in the steel plate 3b. Similarly, when the tremie pipe 11b passes through the space 9c of the joint while filling the space 9c with concrete 4, the space 9c is filled with concrete 4, and the filled concrete 4 is transferred to the steel plate 3a.
From the communication holes 10c and 10d formed in the space 9
d, and also flows out into the space 9b from communication holes 10g and 10h formed in the steel plate 3c.

Therefore, in this column A, even in the joint part where the inside of the steel pipe 2 is partitioned by the steel plates 3a, 3b, and 3c, the filled concrete 4 flows through the communication formed between the steel plates 3a, 3b, and 3c. Hole 10a~
10h into the adjacent spaces 9b and 9d, the concrete 4 goes around sufficiently and is filled into the steel pipe 2 substantially uniformly.

Therefore, it is possible to realize a filled steel pipe concrete column that reliably and fully exhibits the above effects.

Next, a second embodiment shown in FIGS. 3 and 4 will be described. In Figures 3 and 4, the first
Components that are the same as those shown in FIGS. These figures show the joint structure of a filled steel pipe concrete column, and reference numeral B indicates a filled steel pipe concrete column. A filled steel pipe concrete column (hereinafter simply referred to as a "column") includes a steel pipe 2 that also serves as a formwork, and a steel pipe 2 inside the steel pipe 2.
A steel pipe 15 having the same axis as that and through which a tremie pipe (to be described later) passes through, and steel plates 16a and 16 that connect the steel pipe 2 and the steel pipe 15 in directions orthogonal to each other.
b, 16c, 16d, steel pipe 15 and steel plate 16a~
16d, and the steel pipe 2 is filled with concrete 4. In the column B, beams 5a, 5b, 5c, and 5d are installed on the outer peripheral surface of the steel pipe 2 by welding. The beams 5a, 5b, 5c, 5d have horizontally arranged flanges 6a, 6b, 6c, 6d and 7.
a, 7b, 7c, 7d and webs 8a, 8b, 8c, 8d arranged vertically between them. Webs 8a and 8b of beams 5a and 5b are connected to steel plates 16a and 16b via steel pipes 2, and webs 8c and 8d of beams 5c and 5d are connected to steel plates 16c and 16d via steel pipes 2.

Further, in the joint part, spaces 17a and 1 defined by the steel pipe 2, the steel pipe 15, and the steel plates 16a to 16d are provided.
7b, 17c, 17d, and 17e are formed. Further, the steel pipe 15 has communication holes 1 that communicate the space 17e and the space 17a in the thickness direction of the plate.
8a, 18b communicate the space 17e with the space 17b, and the communication holes 18c, 18d communicate with the space 1.
Communication hole 18 that communicates between 7e and the space 17c
Communication holes 18g and 18h are formed, respectively, to communicate the space 17e and the space 17d.

In addition, the steel plate 16a has a space 1 in the thickness direction of the plate.
Communication holes 19a and 19 that connect 7a and 17b
b is formed. Similarly, the steel plate 16b has communication holes 19c and 19d that communicate the spaces 17c and 17d in the thickness direction of the plate, and the steel plate 16c has communication holes 19e and 19d that communicate the spaces 17b and 17c.
Communication holes 19g and 19h are formed in the steel plate 16d to communicate the spaces 17a and 17d, respectively.

Furthermore, a tremie pipe 20 is installed inside the steel pipe 2, passing through the space 17e and filling the concrete 4. Although not shown, an unbonded layer is formed between the steel pipe 2 and the concrete 4, and slits (deformation absorbing parts) 30, 30, ... are formed in the steel pipe 2. , is the same as in the first embodiment.

In column B configured as above, beam 5
Similar to the first embodiment described above, the shearing forces acting mainly on the webs 8a to 8d of the steel plates 16a to 5d
~16d and the point where the axial force is directly transmitted to the concrete 4 through the steel pipe 15, and the axial force transmitted to the concrete 4 is reliably prevented from being transmitted to the steel pipe 2. Even if an axial force is applied to the steel pipe, the slit 30,
With regard to the stress in the axial direction being absorbed by the deformation of 30, . . . , it has the same function and effect as the first embodiment.

In addition, when pouring concrete 4 into the steel pipe 2, the tremie pipe 20 is inserted into the steel pipe 2, and the tremie pipe 20 is sequentially pulled up from the bottom of the steel pipe 2 toward the top at a predetermined speed. Concrete 4 is filled from the tip of the steel pipe 2 and poured into the steel pipe 2. Here, in this column B, when the tremie pipe 15 passes through the space 17e of the joint part while filling the space 17e with concrete 4, the space 17e is filled with concrete 4, and the filled concrete 4 from the communication holes 18a to 18h formed in the steel pipe 15 to the adjacent spaces 17a to 17.
d, respectively. Furthermore, the space 17a
The concrete 4 that has flowed into ~17d is the steel plate 16
It passes through communication holes 19a to 19h formed in a to 16d and flows out into mutually adjacent spaces 17a to 17d.

Therefore, in this column B, even at the partition where the inside of the steel pipe 2 is partitioned by the steel pipe 15 and the steel plates 16a to 16d, the filled concrete 4
The concrete 4 flows into the adjacent spaces 17a to 17d from the communication holes 18a to 18h and 19a to 19h formed in the steel pipe 15 and the steel plates 16a to 16d, and the concrete 4 is sufficiently circulated and spread almost uniformly into the steel pipe 2. It will be filled with.

In each of the above embodiments, the joint structure of the filled steel pipe concrete column can be used as a flexible structure column because the cross-sectional area of the column can be reduced. Possible applications include super high-rise buildings with heavy and flexible structures that are completely different from conventional light and flexible structures.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to directly and clearly transmit force from a beam to a column, and to transmit the shear force of the beam to concrete as its axial force. The transmitted axial force is prevented from being transmitted to the steel pipe, and the axial force applied to the steel pipe is absorbed by the deformation absorption part, so the steel pipe receives almost no axial stress, and the steel pipe It is fully expected that the confining effect will increase and the compressive strength of the concrete will increase.The cross-sectional area of the column can be reduced, and the concrete can be evenly filled into the steel pipe, so the above effects can be achieved reliably and sufficiently. Filled steel pipe concrete columns can be realized.

[Brief explanation of drawings]

1 and 2 are diagrams showing a first embodiment of the present invention, in which FIG. 1 is a partial sectional view of the main part of the invention, and FIG. 2 is a cross-sectional view of FIG. 3 and 4 are diagrams showing a second embodiment of the present invention, and a third embodiment is shown in FIG.
The figure is a partial sectional view of the main part of this invention, and FIG.
Figure 5 is a cross-sectional view of the figure, and Figure 6 is an explanatory diagram for explaining where this invention is actually used.
The figure is a partial sectional view of a pillar showing the state of formation of an unbonded layer, FIGS. 7 and 8 are diagrams for explaining the conventional technology, and FIG. FIG. 8 is a cross-sectional view of FIG. 7. A, B, 26...Filled steel pipe concrete column, 2
...Steel pipe, 3a, 3b, 3c, 16a, 16b,
16c, 16d... steel plate, 4... concrete,
5a, 5b, 5c, 5d, 27...beam, 10a,
10b, 10c, 10d, 10e, 10f, 10
g, 10h, 18a, 18b, 18c, 18d,
18e, 18f, 18g, 18h, 19a, 19
b, 19c, 19d, 19e, 19f, 19g,
19h...Communication hole, 21...Unbond treatment layer,
30...Slit (deformation absorbing part).

Claims (1)

[Claims] 1. A structure of a filled steel pipe concrete column consisting of a steel pipe filled with concrete, in which at the joint part where the steel pipe and the beam are connected, the steel pipe protrudes in the radial direction of the steel pipe, and the steel pipe At least one steel plate extending in the axial direction of the pipe and included in the concrete is connected to the inner wall of the steel pipe so as to be continuous with the beam; At least one communication hole is formed in a portion of the steel tube of the column to horizontally communicate the inner spaces of the steel tube divided by the column to allow the filled concrete to pass therethrough, and further, a portion of the steel tube of the column is provided with a hole that allows the portion to be deformed. Therefore, in order to form a deformation absorbing part to prevent axial stress from occurring in the steel pipe, and to eliminate adhesion between the steel pipe and concrete at the interface between the steel pipe and the concrete filled in this steel pipe. The structure of a filled steel pipe concrete column is characterized by having an unbonded layer.