JP2000297472A - Connecting structure of infilled steel-pipe concrete column and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely connect an infilled steel-pipe concrete column and a beam simply at a low cost. SOLUTION: In the connecting structure of the infilled steel-pipe concrete column 2, in which the inside of a column steel pipe 3 is filled with concrete 10, and a beam (a footing beam) 1, a root-winding steel pipe 4 is installed concentrically on the column base section of the column steel pipe 3 and arranged on the beam, and connecting members 5 fixed onto the beam 1 are inserted into an annular opening between the column steel pipe 3 and the root-winding steel pipe 4 while the opening 6 is filled with concrete 7 and the connecting members 5 are fixed. Other connecting members 9 extending between the beam 1 and the column base section is mounted into the column steel pipe 3 in addition to or in place of the connecting members 5. Studs 8 are fitted onto the external surface of the column base section of the column steel pipe 3. The height size of the root-winding steel pipe 4 is set in the outside-diameter size D or more of the infilled steel-pipe concrete column 2. Anchor members in which fixing head sections are formed integrally at the end sections of reinforcements are used as the connecting members 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a filled steel pipe concrete column in which concrete is filled in a column steel pipe and a reinforced concrete beam (including a foundation beam).

[0002]

2. Description of the Related Art As is well known, a concrete-filled steel tube column is a type of steel-concrete composite structure column in which concrete is filled in a column steel tube, and has recently been widely used as a structure of a high-rise building. ing.

[0003] By the way, such a joint between a filled steel pipe concrete column and a reinforced concrete beam (including a foundation beam) cannot be employed as it is in the case of ordinary steel frame, reinforced concrete, or steel reinforced concrete. For example, various joining structures have been tried, such as one in which a base plate is provided on a column base of a steel column and fastened to a beam, and one in which a column base of a column steel tube is directly inserted into a foundation beam and fixed.

[0004]

However, in the above-mentioned methods, the joining strength cannot be sufficiently secured, the construction is complicated and the cost is high, and the beam arrangement is difficult. Depending on the structure of the foundation beam, it cannot be applied, and the development of a more effective joint structure has been desired.

[0005] In view of the above circumstances, an object of the present invention is to provide an effective structure capable of securely and simply joining a reinforced concrete beam and a reinforced concrete beam at low cost.

[0006]

The invention of claim 1 is a joint structure between a concrete column filled with concrete in a column steel pipe and a reinforced concrete beam, and a column base of the column steel pipe. Root-wound steel pipes are mounted concentrically, and the column steel pipe and the root-wound steel pipe are arranged on the beam, and the joining member fixed to the beam is placed in an annular gap between the column steel pipe and the root-wound steel pipe. At the same time, the gap is filled with concrete to fix the joint member, and the column base and the beam are joined by the joint member.

According to a second aspect of the present invention, a stud fixed to concrete filled in the gap is attached to an outer surface of a column base of the column steel pipe.

According to a third aspect of the present invention, the height dimension of the rooted steel pipe is set to be equal to or larger than the outer diameter dimension of the filled steel pipe concrete column.

According to a fourth aspect of the present invention, another connecting member is provided in the column steel pipe so as to extend between the beam and the column base.

A fifth aspect of the present invention is a joint structure between a filled steel pipe concrete column and a reinforced concrete beam which are also filled with concrete inside a column steel pipe, wherein the column steel pipe is disposed on the beam, and The fixing member is inserted into the column steel pipe and fixed to the concrete in the column steel pipe, and the column base and the beam are bonded by the connecting member.

According to a sixth aspect of the present invention, an anchor member having a fixing head integrally formed at an end of a reinforcing bar is used as the joining member.

[0012]

FIG. 1 and FIG. 2 show an embodiment of the present invention. In this embodiment, when the filled steel pipe concrete column 2 is joined to the ordinary reinforced concrete foundation beam 1, the base steel pipe 4 is attached to the column base of the column steel pipe 3.
Are mounted concentrically and arranged on the foundation beam 1, and the joining member 5, whose base end is fixed to the foundation beam 1 and made to protrude, is formed into an annular gap 6 between the column steel pipe 3 and the root steel pipe 4. The joint member 5 is fixed by filling the gap 6 with concrete 7 at regular intervals in the circumferential direction.

A large number of studs 8 are attached to the outer surface of the column base of the column steel pipe 3, and these studs 8 are fixed in the concrete 7 filled in the gap 6, so that the column steel pipe 3 is fixed.
And the steel tube 4 are firmly integrated with each other via the concrete 7, so that the column base is joined to the foundation beam 1 with sufficient strength by the joining member 5.

Further, another connecting member 9 is provided along the inner surface of the column base in the column steel pipe 3, and these connecting members 9 extend between the base beam 1 and the column base. By being fixed in the concrete 10 in the column steel pipe 3, the column base and the foundation beam 1 are also firmly joined by these joining members 9, and the joining member 9 also functions as a main bar of the column base. Therefore, the filled steel pipe concrete column 2 substantially functions as a reinforced concrete column at the column base.

According to the above structure, the joint members 5 and 9 can sufficiently secure the joint strength between the concrete-filled steel pipe column 2 and the foundation beam 1, and can reliably transmit both the axial force and the moment. I have. In order to effectively transmit the axial force and the moment, it is preferable that the height dimension of the root-wound steel pipe 4 is set to be equal to or larger than the outer diameter D of the filled steel pipe concrete column 2 as shown in FIG. And the joining member 9
It is preferable that the fixing length in the column steel pipe 3 is about 1.5 times or more the outer diameter D.

The above structure allows the foundation beam 1 to be constructed in the usual manner, except that the connecting members 5 and 9 are provided. 3 is disposed on the foundation beam 1 and only the concrete 7 and 10 are cast and filled therein, so that the construction is extremely easy and the cost is advantageous. And much more effective.

As the joining members 5 and 9, appropriate anchor members such as anchor bars, anchor bolts or PC steel rods can be employed, and if necessary, the distal ends thereof may be used like ordinary anchor members. Hooks and fixing plates may be attached.
The anchor member 11 shown in (a) and (b) can be suitably used. The anchor member 11 can be configured such that a fixing head 11b made of a rectangular or circular plate material is firmly integrated with both ends or one end of a deformed reinforcing bar 11a of about D10 to D51 by induction heating or the like. The fixing head 11b is formed by processing so as to expand the end itself of the fixing head 11b. The fixing head 11b has excellent joining strength, is inexpensive, and has excellent workability.

FIGS. 4 and 5 show another embodiment of the present invention. This is such that the joining member 9 in the above embodiment is omitted and the joining is performed only by the joining member 5. Also in this case, the necessary and sufficient joining strength can be obtained by setting the diameter and the number of the joining members 5. In particular, by using the above-described anchor member 11 as the joining member 5, the required number is small.

FIGS. 6 and 7 show still another embodiment. This is such that the root-wound steel pipe 4 and the joining member 5 in the above embodiment are omitted, and the joining is performed only by the joining member 9 in the above embodiment. In this case as well, the necessary and sufficient joining strength can be obtained by setting the diameter and the number of the joining members 9. In particular, by employing the above-described anchor member 11 as the joining member 9, the required number is small.

In each of the above embodiments, the joint structure between the concrete-filled steel pipe column 2 and the foundation beam 1 is used. However, the present invention is not limited to the foundation beam 1 and can be similarly applied to joints with beams on each floor. That is natural.

[0021]

According to the first aspect of the present invention, a steel pipe is provided on a column base, and a connecting member disposed in a gap between the steel pipe and the steel pipe is fixed to concrete so as to be joined. The column base and the beam can be securely connected to each other in a state where the axial force and moment can be transmitted, and sufficient joint strength can be secured. Since it is only necessary to install them, the construction is extremely easy and the cost is advantageous.

According to the second aspect of the present invention, since the stud fixed to the concrete filled in the gap is provided on the outer surface of the column steel pipe, the column steel pipe and the rooted steel pipe can be more reliably integrated. The joining strength can be further increased.

According to the third aspect of the present invention, since the height of the root-wound steel pipe is set to be equal to or larger than the outer diameter of the concrete column filled with steel pipe, the moment can be transmitted sufficiently and reliably by the root-wound steel pipe.

According to the fourth aspect of the present invention, since another connecting member is provided between the beam and the column base in the column steel pipe, the bonding strength can be further increased, and the connecting member is used as a column main reinforcement. Can also function.

According to a fifth aspect of the present invention, a column steel pipe is arranged on a beam, and a connecting member fixed to the beam is inserted into the column steel pipe and fixed to concrete in the column steel pipe, so that the column is formed only by the connecting members. The legs and the beams can be joined very easily.

According to the sixth aspect of the present invention, since an anchor member in which a fixing head is integrally formed at an end of a reinforcing bar is used as a joining member, a sufficient joining strength can be obtained with a small number of anchor members and the cost is low. And excellent workability.

[Brief description of the drawings]

FIG. 1 is an elevational sectional view showing a joint structure according to an embodiment of the present invention.

FIG. 2 is a plan sectional view of the same.

FIG. 3 is a view showing an anchor member suitable for use as a joining member in the present invention.

FIG. 4 is an elevational sectional view showing a joint structure according to another embodiment of the present invention.

FIG. 5 is a plan sectional view of the same.

FIG. 6 is an elevational sectional view showing a joint structure according to still another embodiment of the present invention.

FIG. 7 is a plan sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation beam (beam) 2 Filled steel pipe concrete column 3 Column steel pipe 4 Root roll steel pipe 5 Joining member 6 Gap 7 Concrete 8 Stud 9 Joining member 10 Concrete 11 Anchor member 11a Deformed bar 11b Fixing head

Claims (6)

[Claims] 1. A joint structure between a filled steel pipe concrete column in which concrete is filled in a column steel pipe and a reinforced concrete beam, wherein a root-wound steel pipe is concentrically mounted on a column base of the column steel pipe. The column steel pipe and the root-winding steel pipe are arranged on a beam, and the joining member fixed to the beam is inserted into an annular gap between the column steel pipe and the root-winding steel pipe, and the gap is filled with concrete. A joint structure between a filled steel tubular concrete column and a beam, wherein the joint member is fixed, and the column base and the beam are joined by the joint member. 2. The concrete column and beam according to claim 1, wherein a stud fixed in concrete filled in the gap is attached to an outer surface of a column base of the column steel tube. Joint structure. 3. The joint structure between a filled steel pipe concrete column and a beam according to claim 1 or 2, wherein a height dimension of the rooted steel pipe is set to be equal to or larger than an outer diameter dimension of the filled steel pipe concrete column. 4. The concrete column and beam as claimed in claim 1, wherein another connecting member is provided in the column steel pipe so as to extend between the beam and the column base. Joint structure. 5. A joint structure between a filled steel pipe concrete column in which concrete is filled in a column steel pipe and a reinforced concrete beam, wherein the column steel pipe is arranged on the beam, and a joint member fixed to the beam is provided. A joint structure between a filled steel pipe concrete column and a beam, wherein the column is inserted into a column steel pipe and fixed to concrete in the column steel pipe, and the column base and the beam are joined by the joining member. 6. The filled steel pipe concrete according to claim 1, wherein said joint member is an anchor member having a fixing head integrally formed at an end of a reinforcing bar. Joint structure between pillar and beam.