JP2651607B2 - Joint structure of steel tube concrete column, steel tube concrete column and construction method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a steel pipe concrete column constituted by filling concrete inside a steel pipe, a steel pipe concrete column, and a method of constructing the same. TECHNICAL FIELD The present invention relates to a joint structure of a steel pipe concrete column capable of obtaining a high-strength and high-quality column by work, a steel pipe concrete column, and a method of constructing the same.

"Conventional technology" A steel pipe concrete column in which concrete is arranged in a steel pipe receives the compressive force acting in the axial direction by concrete with strong compressive strength, and the concrete pipe has the radial expansion accompanying the compression of concrete. By suppressing it by the find effect (tightening stress in the circumferential direction), a column member having a high axial force is realized. Conventionally, such steel pipe concrete columns are connected by welding beams to the steel pipe. Therefore, a mechanism for effectively transmitting the beam load to the concrete in the steel tubular concrete column is required. As an example of such a mechanism, a configuration has been conventionally known in which a supporting plate protruding from the inner surface of a steel pipe is provided, and a load from a beam is transmitted to concrete in the steel pipe via the supporting plate.

FIG. 12 to FIG. 15 are views showing the conventional steel pipe concrete column. In these figures, reference numeral 21 denotes a steel pipe concrete column, and the concrete column 21 is configured by filling a steel pipe 22 with concrete 23 inside, and
A projecting portion projecting radially inward of the steel pipe 25, that is, two ring-shaped supporting plates 26, 26 are fixed to the inside of the steel pipe 25 at a portion to be connected to 24. As a result, the vertical load acting on the beam 24 is
From the supporting plate 26 to the concrete 23 inside.

“Problems to be Solved by the Invention” However, in the configuration in which the supporting plate is protruded from the inner surface of the steel pipe as described above, the following problems to be solved remain.

When placing concrete 23 in steel pipe 22, support plate
26 The quality of concrete poured may not be ensured due to poor penetration of concrete to the lower surface and remaining air. In particular, since there is a possibility that the quality of concrete cannot be ensured at the column / beam joint, which is a very important point in the structure of the building, construction under the design strength is not allowed. Therefore, the concrete filling property is improved by increasing the slump value of the concrete at the time of casting to improve the fluidity, but in this case, it is difficult to desire a high strength, high quality filled concrete, Not only did the advantages of steel tube concrete columns not be effectively utilized, but it was difficult to apply them to high-rise buildings.

On the other hand, even if the concrete 23 is surely filled to the lower surface of the support plate 26, since the support plate 26 protrudes from the inner surface of the steel pipe 22, the consolidation sedimentation accompanying the subsequent hardening shrinkage of the filled concrete is regulated by the support plate 26. By doing, the 14th
As shown in the drawing, a gap 27 is formed on the lower surface of the support plate 26,
A phenomenon occurs in which air pools and water pools are formed, and only aggregates stay near the inner periphery of the support plate 26, and a bean-plate-like concrete 28 having low strength is formed. There is a concern that the quality of the filled concrete near the beam joint may deteriorate, and in particular, when a gap 27 is formed, the steel pipe 22 bears a vertical load by the amount of the gap 27 and contracts and falls. Otherwise, the load is not transmitted to the concrete 23 by the support plate 26, and the buckling of the steel pipe 22 near the lower end of the beam joint causes the extreme deterioration in the strength of the entire steel pipe concrete column 21 due to buckling. Yes, a design problem.

As shown in FIG. 15, the supporting plate 26 is usually provided at the upper end of the steel pipe 22 (that is, the steel pipe 22 is often connected immediately above the column / beam joint). Therefore, the opening diameter of the upper end opening of the steel pipe 22 is reduced, as it were, by the support plate 26. For this reason, the support plate 26 gets in the way,
Because it is difficult and difficult to remove the latence floating on the upper surface of the cast concrete 23, the result is that there is a concern that the strength may be reduced at the concrete joint surface due to insufficient removal of the latence. Become. In addition, since a space for removing latencies is required below the lower surface of the support plate 26, the concrete joint surface must be sufficiently lower than the lower surface of the support plate 26. Due to the large volume and labor required for mortar construction, application to high-rise buildings was unsuitable from this aspect as well.

The present invention has been made in view of the above circumstances, and a steel pipe concrete column capable of effectively transmitting a beam load to concrete without providing a projection on the inner surface of the steel pipe, thereby improving the strength of the column and improving work efficiency. The purpose of the present invention is to provide a joint structure, a steel pipe concrete column, and a method for constructing the same.

"Means for Solving the Problems" In order to solve the problems described above, the present invention employs the following means.

In other words, the invention according to the first aspect is a steel pipe cut to a predetermined floor height and not provided with a projection inside,
A joint structure, which is a connecting portion of a steel pipe concrete column formed by connecting a plurality of pillars made of concrete poured into the steel pipe in a connected state, and protruding from an upper end portion of the steel pipe to an outer peripheral side thereof. Along with providing a joining plate along the circumferential direction, a connecting plate also serving as a support plate that covers the opening at the lower end of the steel pipe, and further, each of the columnar bodies, the joining plate and the connecting plate are connected by connecting means. The present invention is characterized in that a joint structure of steel pipe concrete columns which are connected to each other by being connected is formed.

Further, the invention according to the second aspect is characterized in that a plurality of pillars composed of a steel pipe cut to a predetermined floor height and having no projection inside thereof, and concrete cast in the steel pipe are provided. A steel pipe concrete column constituted in a body connected state, wherein at least an outer peripheral portion of an upper end portion of the steel pipe is provided along a circumferential direction of the steel pipe with a joint member for beam joining protruding to the side thereof along the circumferential direction of the steel pipe. At the lower end, a connecting plate also serving as a support plate that covers the opening is provided, and further, each of the pillars is
The connection plate and the connection member are connected to each other by being connected by connection means.

Further, the invention according to a third aspect is characterized in that the method for constructing a steel pipe concrete column comprises the following steps.

(I) At the lower end of a steel pipe cut to a predetermined floor height and not provided with a protruding portion, a connecting plate also serving as a support plate is provided at the lower end to cover the opening, and at least on the outer periphery of the upper end of the steel pipe, A step of forming a steel pipe column by providing a laterally projecting connection member for beam joining along the circumferential direction of the steel pipe; (ii) filling the concrete inside the steel pipe column in advance and casting concrete into the steel pipe column. A step of forming a steel pipe concrete column with latencies removed to a height lower than the upper end face, (iii) a step of building the column in a predetermined place, and connecting a beam to the connection member, and (iv) a column. A step of filling a small amount of mortar on the upper surface of concrete in the body from the upper end surface of the steel pipe and building another column above the steel pipe in an unhardened state of the mortar, (v) a column located on the lower side Between the connection member and the column located above A step of connecting the pillar by connecting the connecting plate of the plate combined.

The invention according to a fourth aspect is characterized in that the method for constructing a steel pipe concrete column comprises the following steps.

(I) At the lower end of a steel pipe cut to a predetermined floor height and not provided with a protruding portion, a connecting plate also serving as a support plate is provided at the lower end to cover the opening, and at least on the outer periphery of the upper end of the steel pipe, A step of forming a steel pipe column by providing a joint member for beam joining protruding sideways along the circumferential direction of the steel pipe; (ii) erection of this column at a predetermined location, A step of filling and casting concrete inside the steel pipe column after connecting the beam, (iii) a step of removing the latence of the concrete upper surface cast in the steel pipe, and (iv) a step of removing the latency from the concrete upper surface. A step of filling the mortar by slightly raising the mortar from the upper end surface of the steel pipe and building another steel pipe column above the steel pipe in an unhardened state of the mortar; Located above the connection member A step of connecting the steel pipe column body by connecting the connecting plate Bearing plate also serves the Kanhashiratai.

"Operation" In the present invention, a connecting member or a joining plate projecting laterally only on the outer periphery of the steel pipe is provided along the circumferential direction of the steel pipe, and the supporting plate portion is not provided inside the steel pipe. There are no protrusions on the inner surface of the steel pipe. Moreover, a connecting plate also serving as a supporting plate is attached to the lower end surface of the steel pipe, and the connecting plate also serving as a supporting plate is connected to the connection member or the joining plate. The load from the steel pipe and the load from the beam are transmitted to the concrete in the steel pipe via the connecting plate also serving as the supporting plate. Therefore, even if there are no protrusions on the inner surface of the steel pipe, the load from the upper column or beam is reliably transmitted to the concrete.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a precast steel pipe concrete column according to a first embodiment of the present invention. In the figure,
Reference numeral 1 denotes a precast steel pipe concrete column. The concrete column 1 has a length of a predetermined floor height (in this embodiment, two layers) and has no projection inside, and the steel tube 2 A plurality of pillars 4 each composed of precast concrete (hereinafter simply referred to as concrete) 3 previously placed in the inside 2 are connected in the axial direction and are roughly configured.

On the outer periphery of the steel pipe 2 of the column 4, the connection members 5, 5,... For beam connection are projected to the predetermined places where the beams 6, 6,. Are provided along the circumferential direction. One of the connection members 5, 5,... Is located at the upper end of the steel pipe 2.

The connection member 5 includes an upper flange 7 and a lower flange 8 which are provided in parallel with each other and extend in the horizontal direction, and a web 9 which vertically connects the upper and lower flanges 7 and 8. The upper surface of the upper flange 7 of the connection member 5 provided at the upper end of the steel pipe 2 is flush with the upper end of the steel pipe 2. However, the lower surface of the upper flange 7 may be in contact with the upper end surface of the steel pipe 2. These upper and lower flanges 7,
8 is formed in a cross shape in a plan view so as to be connected to the beams 6 in four directions in this embodiment. Also,
A predetermined portion of the upper flange 7 close to the steel pipe 2 is provided with a second
As shown in the figure, bolt holes (not shown) for connection with a connecting plate described later are formed along the outer peripheral surface of the steel pipe 2.
Further, bolt holes (not shown) for joining the beam 6 are formed at predetermined positions of the upper and lower flanges 7 and 8 and the distal end portion of the web 9.

On the other hand, on the lower end surface of the steel pipe 2, a connecting plate 10 serving also as a support plate, extending in a direction perpendicular to the axis thereof (that is, in a horizontal direction).
Is attached so as to cover the lower end opening of the steel pipe 2. As shown in FIGS. 4 and 6, the connecting plate 10 is formed in an outer disk shape, and a plurality of radially extending grooves 11, 11,... Are bored at intervals in the circumferential direction. Some of these grooves 11,...
Is extended to the periphery. The shape and the number of the grooves 11,... Are arbitrary. For example, the shape of the grooves 11,... Is not limited to a radial shape, and may be a lattice shape or the like, and may be appropriately determined according to construction conditions and the like. .

The upper and lower pillars 4, 4 are formed by bolts 13, 13,... With the upper flange 7 of the connection member 5 at the upper end of the lower pillar 4 and the connecting plate 10 of the upper pillar 4. , Nuts 14, 14,
Are connected to each other by being connected by connecting means consisting of. Further, the connection member 5 and the beams 6, 6,... Are connected to each other by connecting means including bolts 16, 16,.

Next, the construction method of the precast steel pipe concrete column having the above-described configuration will be described with reference to FIG.
This will be described together with the operation with reference to FIG.

(I) First, a connection member 5 is provided at a predetermined position on the outer peripheral surface of the steel pipe 2.
And a connecting plate is attached to the lower end face of the steel pipe 2 by welding.
A steel pipe column is formed by fixing 10 by welding. In this case, at least one connection member 5 is projected from the upper end of the steel pipe 2, and the upper surface of the upper flange 7 is flush with the upper end of the steel pipe 2.

Next, concrete 3 is cast into the inside of the steel pipe 2 to the vicinity of the upper end of the steel pipe 2 using a tremy tube or the like, and the latence generated on the top end face of the concrete is removed to form the column 4.

During the concrete 3 casting, the top end face of the concrete 3 sinks due to the vibrator or the like and the consolidation sedimentation caused by the hardening shrinkage after casting the filled concrete, and the latence floats on this top end face. Therefore, the latence generated on the top end surface of the concrete 3 (that is, the upper end portion of the steel pipe 2) is removed at a time when the latence removal is appropriate. The method and means for removing latency may be appropriately selected from known methods and means such as high-pressure water jetting or brushing.

It is preferable that bolts 13, 13,... Are inserted from below into bolt holes (not shown) of the upper flange 7 of the connection member 5 and temporarily fixed to the lower surface of the upper flange 7 by welding or the like.

(Ii) Next, the steel pipe column is erected at the site so as to have a predetermined floor height, and beams 9, 9,... Are connected to the connection members 5, 5,. FIG. (A)).

(Iii) Due to the above-mentioned material sedimentation and latence removal, concrete 3 is poured into the upper end surface of the steel pipe 2 and a small gap 18 (see FIG. 3 (a)) not filled occurs.
Therefore, a non-shrinkable mortar that is blended and designed to exhibit higher design strength than concrete 3
19 is slightly raised from the upper end face of the steel pipe 2 to fill the gap. The mortar filling amount may be appropriately determined in accordance with the volume of the grooves 11, 11,... Formed in the center of the back surface of the connecting plate 10, and preferably, the column 4 is built upward as described later. In this case, it is sufficient that the mortar 19 remains in the grooves 11,... And the mortar 19 has a very small filling amount so that the mortar 19 hardly protrudes.

(Iv) Next, another steel pipe 2 having the connection member 5 and the connecting plate 10 attached to the upper part of the column 3 filled with the mortar 19.
Build. Therefore, the air existing between the mortar 19 and the connecting plate 10 passes through the groove 11 on the lower surface of the connecting plate 10 and
Since it is driven out and discharged, no voids or the like are formed due to the accumulation of air on the upper surface of the mortar 19 in the lower steel pipe 2, and the concrete 3 is completely filled in the steel pipe 2.

When the steel pipe 2 is erected on the upper part, the bolts 13 projecting upward from the upper flange 7 of the lower column 4 are inserted into the bolt holes 12 of the connecting plate 10 of the upper steel pipe 2 as described above. ,
, And screwed the nut from above.

Hereinafter, a building is constructed by repeating the above steps (ii) to (iv).

Therefore, in this embodiment, the connection member 5 protruding laterally is provided only along the outer circumference of the steel pipe 2 along the circumferential direction of the steel pipe 2, and the supporting plate portion is not provided on the inner surface of the steel pipe 2. Unlike the conventional case, there is no protrusion on the inner surface of the steel pipe 2. Therefore, even when the concrete 3 is cast on the inner surface of the steel pipe 2, there is no possibility that a void is generated in the steel pipe 2 at all. Therefore, the kneading water can be reduced and the high-strength concrete 3 having a low slump value can be cast. Even if the material of the concrete 3 is consolidated and settled, there is no possibility that a void or the like is formed in the concrete 3 as in the related art, so that a high strength and high quality column 4 can be obtained. In addition, since the upper end surface of the steel pipe 2 is opened to the maximum extent, the above-mentioned latence removal work is very easy, and since the latence can be removed reliably and carefully, the strength at the concrete joint surface is reduced. A sufficient strength can be obtained, and a high-strength, high-quality column 4 can be obtained from this aspect. This makes it possible to construct a high-strength, high-quality precast steel pipe concrete column 1 without impairing any of the advantages of the precast concrete column, such as simplification of the process and shortening of the construction period.

In addition, a connecting plate 10 also serving as a support plate is attached to the lower end of the steel pipe 2 and the connecting plate 10 also serving as a supporting plate is connected to the upper flange 7 of the connection member 5. The load from the steel pipe 2 and the load from the beam 6 of the column 4 are reliably transmitted to the entire section of the concrete 3 in the steel pipe 2 through the connecting plate 10. Therefore, steel pipe 2
Even if there is no protrusion on the inner surface, the load from the upper column 4 or the beam 6 is completely and reliably transmitted to the inside of the concrete 3.

Next, FIG. 7 is a view showing a joint structure of a steel pipe concrete column according to a second embodiment of the present invention. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The difference between this embodiment and the first embodiment is that the connecting portion (that is, the joint portion) of the column 4 is not located at the upper end surface of the joint member 5 at the upper end of the steel pipe 2 but between the joint members 5, 5. It is a point that was. That is, on the outer periphery of the upper end of the steel pipe 2, a joining plate 20 protruding to the side is provided along the circumferential direction of the steel pipe 2,
The connecting members 5, 5, ... are provided along the circumferential direction of the steel pipe 2 so as to protrude to the side thereof on the outer periphery except the upper and lower ends of the steel pipe 2. The steel pipes 2, 2 that are connected to each other in the up-down direction are connected to each other by the joining plate 20 and the connecting plate 10.
3 and... And nuts 14.

The method of constructing such a steel pipe concrete column 1 is the same as in the first embodiment. Therefore, according to this embodiment, the same operation and effect as those of the first embodiment can be obtained.

FIGS. 8 and 9 show a steel pipe concrete column according to a third embodiment of the present invention. In the figure,
Reference numeral 1 denotes a steel pipe concrete column. The concrete column 1 is composed of a steel pipe 2 having a length of a predetermined floor height (in this embodiment, two layers) and concrete 3 cast in the steel pipe 2. A plurality of pillars 4 are connected to each other in the axial direction and have a schematic configuration.

On the outer peripheral surface of the steel pipe 2 of the column 4, connecting members 5, 5,... For beam connection are provided at predetermined positions to which the beams 6, 6,.
It is provided along the circumferential direction of the steel pipe 2 so as to protrude to the side. One of the connection members 5, 5,... Is located at the upper end of the steel pipe 2.

The connection member 5 includes an upper flange 7 and a lower flange 8 which are provided in parallel with each other and extend in the horizontal direction, and a web 9 which vertically connects the upper and lower flanges 7 and 8. The upper surface of the upper flange 7 of the connection member 5 provided at the upper end of the steel pipe 2 is flush with the upper end of the steel pipe 2. However, the lower surface of the upper flange 7 may be in contact with the upper end surface of the steel pipe 2 as in the first embodiment. In this embodiment, the upper and lower flanges 7 and 8 are formed in a cross shape in a plan view so as to be connected to the beams 6 in four directions. As shown in FIG. 2, a bolt hole (not shown) for connection to a connecting plate, which will be described later, is formed in a predetermined location of the flange 7 close to the steel pipe 2 along the outer peripheral surface of the steel pipe 2. Have been. Further, bolt holes (not shown) for joining the beam 6 are formed at predetermined positions of the upper and lower flanges 7 and 8 and the distal end portion of the web 9.

On the other hand, on the lower end surface of the steel pipe 2, a connecting plate 30 that also serves as a support plate extending in both directions on the inner diameter side and the outer diameter side of the steel pipe 2 is attached in a direction orthogonal to its axis (that is, in a horizontal direction). 4 As shown in FIGS. 11 (a) to 11 (c), the connecting plate 30 is formed in an outer disk shape and has a through hole at the center thereof.
, And bolt holes 32, 32, ... are formed in the peripheral portion at intervals in the circumferential direction. In addition, this through hole 3
The shape and the number of 1, 31, ... are arbitrary, and may be appropriately determined according to construction conditions and the like.

The upper and lower columns 4, 4 are formed by connecting the upper flange 7 of the connection member 5 at the upper end of the lower column 4 and the connecting plate 30 of the upper column 4 to the bolts 13, 13,. , Nuts 14, 14,
Are connected to each other by being connected by connecting means consisting of. Further, the connection member 5 and the beams 6, 6,... Are connected to each other by connecting means including bolts 16, 16,.

Next, a method of constructing a steel pipe concrete column having the above-described configuration will be described with reference to FIGS. 10 (a) and 10 (b) together with the operation thereof.

(I) First, a connection member 5 is provided at a predetermined position on the outer peripheral surface of the steel pipe 2.
And a connecting plate is attached to the lower end face of the steel pipe 2 by welding.
30 is fixed by welding. In this case, at least one connection member 5 is projected from the upper end of the steel pipe 2, and the upper surface of the upper flange 7 is flush with the upper end of the steel pipe 2.

It is preferable that bolts 13, 13,... Are inserted from below into bolt holes (not shown) of the upper flange 7 of the connection member 5 and temporarily fixed to the lower surface of the upper flange 7 by welding or the like.

(Ii) Next, the steel pipe 2 is erected at the site so as to have a predetermined floor height, and beams 9, 9,... Are connected to the connection members 5, 5,. A cast-in-place concrete 3 is cast inside the steel pipe 2 near the upper end face thereof using a tremy tube or the like, and the latence generated on the top end face of the concrete is removed to construct a column 4 (see FIG. 3 (a)). .

During the concrete 3 casting, the top end face of the concrete 3 sinks due to the vibrator or the like and the consolidation sedimentation caused by the hardening shrinkage after casting the filled concrete, and the latence floats on this top end face. Therefore, the latence generated on the top end surface of the concrete 3 (that is, the upper end portion of the steel pipe 2) is removed at a time when the latence removal is appropriate. The method and means for removing the latency may be appropriately selected from well-known methods and means such as high-pressure water jetting or brushing.

(Iii) Due to the above-mentioned material sedimentation and laitance removal, concrete 3 is cast on the upper end surface of the steel pipe, and voids 18 (see FIG. 3 (a)) are not filled. Therefore,
Non-shrinkable mortar 19, which is blended and designed so as to exhibit a higher design strength than concrete 3, is filled into this space by being raised slightly higher than the upper end surface of steel pipe 2.

(Iv) Next, another steel pipe 2 having the connecting member 5 and the connecting plate 30 attached to the upper part of the column 3 filled with the mortar 19.
Build. Therefore, the excess amount of the filled mortar 19 flows out into the steel pipe 2 through the through hole 31 at the center of the connecting plate 30, and the lower steel pipe 2 is densely filled with high-quality concrete. No voids or the like are generated.

When the steel pipe 2 is erected on the upper part, the bolts 13 projecting upward from the upper flange 7 of the lower column 4 are inserted into the bolt holes 12 of the connecting plate 10 of the upper steel pipe 2 as described above. ,
... and screwed into the nut.

Hereinafter, a building is constructed by repeating the above steps (ii) to (iv).

Therefore, also in this embodiment, the connection member 5 protruding laterally is provided along the circumferential direction of the steel pipe 2 only on the outer circumference of the steel pipe 2, and the supporting plate portion is not provided on the inner circumferential surface of the steel pipe 2. Therefore, unlike the related art, there is no projection on the inner surface of the steel pipe 2. Therefore, even when the concrete 3 is poured into the steel pipe 2, there is no possibility that a void is formed between the concrete 3 and the steel pipe 2. Therefore, the kneading water is reduced to reduce the slump value of the high-strength concrete 3. Even if the concrete 3 can be cast and the material of the concrete 3 is compacted and settled, there is no possibility that a void or the like is formed in the concrete 3 as in the conventional case, so that a high strength, high quality column 4 can be obtained. Moreover, since the upper end surface of the steel pipe 2 is opened as widely as possible,
The latence removal work described above becomes very easy, and the latence can be removed reliably and carefully, so that sufficient strength can be secured at the concrete joint surface, and from this aspect, high-strength, high-quality cast-in-place concrete Can be obtained.

Moreover, a connecting plate 30 is attached to the lower end surface of the steel pipe 2 so as to extend in both directions on the inner diameter side and the outer diameter side of the steel pipe 2, and the connecting plate 30 is connected to the upper flange 7 of the connection member 5. Therefore, the load from the steel pipe 2 and the load from the beam 6 of the upper column 4 are transmitted to the concrete 3 in the steel pipe 2 via the connecting plate 30. Therefore, even if there is no protrusion on the inner surface of the steel pipe 2, the load from the upper column 4 or the beam 6 is completely and reliably transmitted to the inside of the concrete 3.

The details of the joint structure of the steel pipe concrete column, the steel pipe concrete column, and the method of construction of the present invention are not limited to the above-described embodiment, and various modifications are possible. As an example, in the first and second embodiments, the groove 11 is formed in the connecting plate 10 provided on the lower end surface of the steel pipe 2.
11 is not indispensable, and the shape of the mortar 19 is not particularly limited as long as no void is formed on the mortar 19.
Further, in the above embodiment, the column 4 (or the steel pipe 2) has a length of two layers, but is not limited to this, and is not limited to one layer, three layers, or four or more layers. Of course, it can be a length. Further, while both the first and second embodiments described above relate to precast steel pipe concrete columns, it goes without saying that this can be realized by cast-in-place steel pipe concrete columns as in the third embodiment. And the joint structure of the steel pipe concrete column of this invention, the steel pipe concrete column, and the construction method thereof perform an unbonding process on the inner surface of the steel pipe 2,
And, as a configuration in which a deformation absorbing portion is provided in the middle of the steel pipe 2,
By configuring the steel pipe 2 in advance, it can be suitably applied to unbonded steel pipe concrete columns.

[Effects of the Invention] As described above in detail, according to the present invention, a connection member or a joining plate projecting to the side of a steel pipe constituting a steel pipe concrete column is provided along the circumferential direction of the steel pipe. ,
Since no supporting plate portion is provided on the inner surface of the steel pipe, there is no projection on the inner surface of the steel pipe unlike the related art. Therefore, when concrete is poured into the inside of this steel pipe and when the concrete material sinks, no voids are created between the concrete and the steel pipe, so that a high-strength, high-quality filled steel pipe concrete column is obtained. Can be. In addition, the upper end of the steel pipe is as wide open as possible, making it easier to remove the latence generated on the top end of the concrete. And a high-strength, high-quality concrete concrete column can be obtained from this aspect.

Moreover, a connecting plate also serving as a supporting plate is attached to the lower end surface of the steel pipe, and the connecting plate also serving as a supporting plate is connected to the connection member or the joining plate. The load from the steel pipe and the load from the beam are transmitted to the concrete in the steel pipe via the connecting plate also serving as the supporting plate, and the load from the column and the beam above these is reliably transmitted to the inside of the concrete.

Therefore, according to the present invention, a steel pipe concrete column capable of effectively transmitting a beam load or the like to the entire section of concrete without providing a projection on the inner surface of the steel pipe, thereby improving the strength of the column and the work efficiency. The joint structure, the steel pipe concrete column and the method for constructing the same can be realized.

[Brief description of the drawings]

1 and 2 are views showing a steel pipe concrete column according to a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view.
FIG. 2 is a sectional view taken along the line II-II 'of FIG. 1, and FIG. 3 is a process diagram for explaining a method of constructing a steel pipe concrete column according to a first embodiment of the present invention. 6 to 6 are views showing only the connecting plate taken out, FIG. 4 is a perspective view with the top face up, FIG. 5 is a perspective view with the back face up, FIG. Fig. 7 is a sectional view, Fig. 7 is a longitudinal sectional view showing a steel pipe concrete column according to a second embodiment of the present invention,
8 and 9 are views showing a steel pipe concrete column according to a third embodiment of the present invention. FIG. 8 is a longitudinal sectional view.
9 is a sectional view taken along the line IX-IX 'of FIG. 8, FIG. 10 is a process diagram for explaining a method of constructing a steel pipe concrete column according to a third embodiment of the present invention, FIG. Is a perspective view showing only the connecting plate, FIG. 12 to FIG. 15 are diagrams showing a conventional steel pipe concrete column, FIG. 12 is a cross-sectional view of a connection portion, FIG. 13 is FIG. 14 is a cross-sectional view taken along the line XIII-XIII ′, FIG. 14 is a cross-sectional view of the steel pipe showing a state in which a gap is formed on the lower surface side of the support plate, and FIG. FIG. 1 ... steel pipe concrete column, 2 ... steel pipe, 3 ... concrete, 4 ... pillar, 5 ... connection member, 6 ... beam, 10
30 ... connecting plate, 13 ... bolt, 14 ... nut (all connecting means), 20 ... connecting plate.

Claims (4)

(57) [Claims] A steel pipe cut to a predetermined floor height and not provided with a projection therein, and a plurality of pillars made of concrete cast in the steel pipe are connected in a plural number. A joint structure which is a connecting portion of a steel pipe concrete column, wherein a joining plate projecting outward from the upper end of the steel pipe is provided along the circumferential direction of the steel pipe, and an opening is formed at the lower end of the steel pipe. A joint structure of a steel pipe concrete column in which a connecting plate serving also as a support plate for covering a portion is provided, and each of the pillars is connected to each other by connecting the connecting plate and the connecting plate by connecting means. 2. A steel pipe which is cut to a predetermined floor height and has no protrusion therein, and a plurality of pillars made of concrete cast in the steel pipe are formed in a connected state. A steel pipe concrete column, wherein at least an outer periphery of an upper end portion of the steel pipe is provided with a joint member for beam joining protruding laterally along a circumferential direction of the steel pipe, and a lower end of the steel pipe is provided at a lower end of the steel pipe. A connecting plate also serving as a support plate that covers the opening is provided, and each of the pillars is connected to each other by connecting the connecting plate and the connection member by connecting means. Steel pipe concrete pillar. 3. A steel pipe cut to a predetermined floor height and not provided with a projection therein is provided at the lower end thereof with a connecting plate also serving as a supporting plate for covering the opening thereof, and at least on the outer periphery of the upper end of the steel pipe. A step of forming a steel pipe column by providing a joint member for beam joining protruding to the side along the circumferential direction of the steel pipe, and pre-filling and casting concrete inside the steel pipe column to form a steel pipe column. A step of forming a steel pipe concrete column in a state where latencies have been removed to a height lower than the upper end face of the body,
A step of connecting the beam to the connection member after the column is erected at a predetermined place, and filling a small amount of mortar on the concrete upper surface from the upper end surface of the steel pipe in the column, and the mortar is in an unhardened state. In this step, another column is erected on the upper part of the steel pipe, and the connecting member of the lower column and the connecting plate also serving as the supporting plate of the upper column are connected to each other by connecting And a step of connecting steel pipes. 4. A connecting plate also serving as a pressure plate for covering an opening of a steel pipe which is cut to a predetermined floor height and has no projection therein, and which is provided at least on the outer periphery of the upper end of the steel pipe. A step of forming a steel pipe column by providing a joint member for beam joining projecting laterally along the steel pipe circumferential direction, and erection of this column at a predetermined location, After connecting the beams, a step of filling and casting concrete inside the steel pipe column, a step of removing the latence of the concrete upper surface cast in the steel pipe, and a step of applying mortar to the upper surface of the concrete from which the latence has been removed, on the steel pipe Filling the mortar by raising a small amount from the end face, building another steel pipe column at the top of this steel pipe in the unhardened state of the mortar, and connecting the steel pipe column located at the lower side and the upper side Steel tube column support Construction method of a steel pipe concrete Columns and a step of connecting the steel pipe column body by connecting the connecting plate of the plate combined.