JP3165246B2 - Joint structure between concrete-filled steel tube concrete column and PC beam and method of joining them - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint between a column and a beam in a building, and more particularly to a joint structure between a concrete column and a PC beam filled with concrete inside a steel pipe and their structures. It relates to a joining method.

[0002]

2. Description of the Related Art A joint structure between a column and a beam (main beam) is composed of a concrete member of a filled steel pipe concrete (hereinafter referred to as a "filled steel tube concrete column"), and is joined between the concrete columns of the filled steel tube. In recent years, a high-rise building in which the pillar material is made of an H-shaped steel material has been widely used. According to the joint structure between the column and the beam, the amount of steel of the steel frame and rebar and the thickness of the refractory coating are reduced, and the formwork process and the rebar assembly process are unnecessary compared to the conventional method. Has a very great advantage.

[0003] Here, the filled steel pipe concrete column is a composite material in which concrete is densely filled in the steel pipe column and the steel pipe and concrete are completely integrated, and the load (compressive force) of the building structure is increased in the axial direction. Even if it acts, the concrete inside the steel pipe supports the compressive force with the compressive strength, and the radial expansion accompanying the compression of the concrete is suppressed by the confining effect (the circumferential tightening stress) of the steel pipe, It becomes a pillar material with increased strength.

[0004]

However, in the above-described joint structure between a column and a beam, when the span between the filled steel pipe concrete columns is designed to be long, an H-shaped steel beam which is a long member is required. The maximum amount of deflection becomes large, whereby the beam itself tends to vibrate due to an earthquake or the like. Therefore, the floor slab (made of concrete) supported by the H-shaped steel beam may cause a phenomenon such as cracking. Also,
There was also a risk of floor vibration interference. Therefore, in the above-mentioned construction method, it was not possible to design a building by increasing the span between the filled steel pipe concrete columns.

The present invention has been made in view of the above circumstances. Even when a pair of filled steel tubular concrete columns are spaced apart and a long span beam is joined between the columns, the maximum deflection of the beam is reduced. An object of the present invention is to provide a joint structure between a filled steel pipe concrete column and a PC beam which does not adversely affect a concrete floor slab supported by a beam, such as cracking, and a method for joining them.

[0006]

According to the present invention, there is provided a joint structure between a concrete-filled steel pipe column and a PC beam according to the first aspect of the present invention, wherein a pair of steel pipe columns filled with concrete inside the pipe are spaced apart from each other, It is a joint structure between a concrete-filled steel tube column and a beam in which a beam is joined to a side portion between the steel tube columns, and a groove at a longitudinal end portion of an H-shaped steel beam is opened only at the extreme end. The end of the H-shaped steel beam is fixed to the joint position where the opening is formed in the steel pipe column while covering the opening, and the inside of the closed groove of the H-shaped steel beam is fixed. The both ends of the PC steel wire arranged along the web while passing through are connected to the steel column, and inside the entire tube interior of the steel column and the closed groove of the H-shaped steel beam, Concrete is continuously filled through the opening at the joint position, PC
A prestress is introduced into the concrete inside the groove of the H-shaped steel beam due to the tension of the steel wire.

According to a second aspect of the present invention, in the joint structure between the concrete-filled steel pipe column and the PC beam, a large number of projections are formed on the upper surface of the lower flange of the H-shaped steel beam. It is a structure characterized by being performed.

Further, according to a third aspect of the present invention, there is provided a method for joining a concrete-filled steel pipe column and a PC beam, wherein a pair of concrete-filled steel pipe columns are separately arranged inside the pipe, and a beam is provided on a side portion between the steel pipe columns. First, the groove at the longitudinal end of the H-shaped steel beam is closed with an opening provided only at the extreme end, and an opening hole is formed at the joint position of the steel pipe column. Then, the H-shaped steel beam is fixed to the joint position of the steel pipe column while covering the opening hole, and the PC steel wire is passed through the closed groove of the H-shaped steel beam. Arrange the bars along the web, and connect both ends to the steel column,
Next, press in the filling concrete from the lower part of the steel pipe column,
Concrete is densely filled in the entire inside of the pipe of the steel pipe column, and the concrete that has flowed into the H-shaped steel beam from the opening hole of the steel pipe column is densely poured into the closed groove, and finally, after the concrete hardens, The method is characterized in that the PC steel wire is tensioned.

[0009]

According to the joint structure of the concrete-filled steel pipe column and the PC beam according to the first aspect of the present invention, a pair of concrete-filled steel pipe concrete columns are spaced apart from each other, and the H-shape having a long span between the columns is provided. Even when a steel beam is joined, the concrete filled inside the steel pipe column and the concrete densely filled inside the closed groove at the end of the H-shaped steel beam have an opening at the joining position. , The bending strength of the end of the H-beam increases. In addition, the prestress is introduced into the concrete filled inside the closed groove of the H-shaped steel beam by the tension of the PC steel wire arranged along the web of the H-shaped steel beam, so that the entire H-shaped steel beam is Bending proof stress increases. Due to the above structure, the maximum deflection of the H-shaped steel beam is reduced, so that the concrete floor slab supported by the H-shaped steel beam does not crack. Also, no floor vibration disturbance occurs.

Further, according to the joint structure of the concrete-filled steel tubular column and the PC beam according to the second aspect, the large number of ribs formed on the upper surface of the lower flange of the H-shaped steel beam are H-shaped steel beams. The joint strength between the concrete filled at the end of the H-beam and the H-beam is increased, thereby increasing the bending strength of the end of the H-beam.

Further, according to the method for joining a concrete-filled steel pipe column and a PC beam according to the third aspect of the present invention, only by inserting the filled concrete from the press-fitting hole of the steel pipe column, the concrete can be continuously connected to the inside of the steel pipe column. Concrete is densely filled into the closed groove portion of the H-shaped steel beam from the opening hole, and labor saving in the concrete press-in step is achieved.

[0012]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the structure of a joint between a column and a beam. Reference numeral 1 denotes a filled steel pipe concrete column, and reference numeral 2 denotes an H-shape joined to the side between the filled steel pipe concrete columns 1 and 1. Shows a steel beam. Reference numeral 3 denotes a concrete floor slab supported on the plurality of H-shaped steel beams 2.

As shown in FIG. 2, a concrete-filled steel tube concrete column 1 has a concrete 10 inside a square steel tube column 1a.
a is filled. A rectangular opening hole 5 is formed at the joint position S on the side of the steel pipe column 1a.

On the other hand, a large number of ribs (projections) 4 are formed on the upper surface of the lower flange 2c of the H-shaped steel beam 2. And the upper and lower flanges 2 on the side of the longitudinal end 2a of the H-shaped steel beam 2
b, 2c, the upper and lower flanges 2b, 2c and the web 2
d, the side plates 6, 6 are fixed so as to cover the grooves 2e, 2e defined by d. One side of the side plates 6, 6 is in contact with the upper and lower flanges 2b, 2c and the web 2d, and the partition plate 7 is provided. , 7 are fixed. Thus, the grooves 2e and 2e of the longitudinal end 2a of the H-shaped steel beam 2 are closed in a state where the opening is provided only on the extreme end side.

A precast PC is mounted on the lower flange 2c of the H-shaped steel beam 2 on the lower side of the center from the partition plates 7,7.
A concrete part 8 is formed. Further, a PC steel wire 9 is arranged on the H-shaped steel beam 2 along the web 2d. That is, this PC steel wire 9 is for introducing prestress into the concrete by the post-tensioning method. The PC steel wire 9 passes through the inside of the groove 2e whose end 9a side is closed, and the other part is the PC steel. It is inserted inside the concrete part 8.

The ends 2a and 2a of the H-shaped steel beam 2 are positioned at the joining position S while covering the opening 5 of the steel tube column 1a, and the periphery of the contact portion is welded. 1a. Thus, the steel pipe beam 2 is disposed between the steel pipe columns 1a, 1a. Here, the extreme end of the PC steel wire 9 is connected to the upper part of the opposite side of the joint position S of the steel pipe column 1a.

The concrete 10 having extremely high fluidity is press-fitted from the press-fitting hole 11 formed in the lower part of the steel pipe column 1a, so that the concrete 10a gradually flows into the inside of the steel pipe column 1a densely from the lower part. Then, the filled steel pipe concrete column 1 is formed. Also, the concrete 10b is continuously poured from the opening hole 5 into the inside of the groove 2e closed and enclosed by the side plate 6 and the partition plate 7 of the H-shaped steel beam 2. Thereby, as shown in FIG.
The concrete 4 and 19 are continuously and densely filled in the closed groove 2e of the H-shaped steel beam 2 and a. Where H
When the concrete 10 filled in the inside of the section steel beam 2 hardens, the bonding force between the ribs 4 formed on the inner wall and the concrete 8 is extremely improved.

After the concretes 10a and 10b have hardened, the PC steel wires 9 connected to the steel pipe columns 1a and 1a are connected.
Is tensioned by a tension jack (not shown), so that prestress is introduced into the concrete 10b (further, the PC concrete portion 8).

According to the column-beam joining structure having the above-described structure, a pair of filled steel pipe concrete columns 1 and 1 are spaced apart from each other and a long span H-beam 2 is arranged between the columns. However, the concrete 10a densely filled in the entire interior of the steel pipe column 1a and the groove 4c closed by the side plate 6 and the partition plate 7 at the end 2a of the H-shaped steel beam 2 were densely filled. Since the concrete 10b is integrally formed by continuous filling, the bending strength on the end 2a side of the H-shaped steel beam 2 increases, thereby reducing the maximum bending amount of the H-shaped steel beam 2.

Further, the large number of ribs 4 formed on the upper surface of the lower flange 2c of the H-shaped steel beam 2 increase the bonding force between the concrete 10b filled therein and the H-shaped steel beam 2. The bending strength of the end 2a of the H-shaped steel beam 2 is increased.

When the PC steel wire 9 arranged along the web 2d of the H-shaped steel beam 2 is tensioned, the groove 2 is formed.
Since the pre-stress is introduced into the concrete 10b (further, the PC concrete portion 8) inside e, the bending strength of the entire H-shaped steel beam 2 increases.

Further, the concrete is poured from the press-fitting holes 11 of the steel pipe columns 1a, 1a, and the steel pipe columns 1a
Continuing with the concrete 10a to be filled inside the pipe,
Since the concrete 10b is densely filled into the closed groove 2e of the H-shaped steel beam 2 from the opening hole 5, labor saving in the concrete press-in step is achieved.

As can be easily understood from the above description, in this embodiment, a pair of filled steel pipe concrete columns 1 and 1 are disposed apart from each other, and an H-shaped steel beam 2 having a long span is interposed between them. Even when joined, the bending strength of the end 2a of the H-shaped steel beam 2 and the bending strength of the entire H-shaped steel beam 2 are improved as compared with the conventional beam in which the beam is formed only of the H-shaped steel. Because it is structured to reduce the amount of deflection, a plurality of H-shaped steel beams 2 ...
There is no fear that the concrete floor slab 9 supported on the floor will crack.

[0024]

As described above, according to the first aspect of the present invention,
According to the joint structure between the concrete-filled steel pipe column and the PC beam described above, a pair of concrete-filled steel pipe columns is spaced apart from each other, and a long span H-beam is joined between the columns. The concrete filled inside the steel pipe column and the concrete densely filled inside the closed groove at the end of the H-shaped steel beam are continuously formed through the opening at the joint position. The bending strength at the end of the H-beam is increased, and the concrete filled at the end of the H-beam is prestressed by the tension of the PC wire arranged along the web of the H-beam. Is introduced to increase the bending strength of the entire H-beam. Therefore, the maximum amount of deflection of the H-shaped steel beam is reduced, so that there is no fear of causing cracks or the like in the concrete floor slab supported by the H-shaped steel beam.

According to the joint structure between the concrete-filled steel tubular concrete column and the PC beam according to the second aspect, the large number of ribs formed on the upper surface of the lower flange of the H-shaped steel beam are H-shaped steel beams. The joint strength between the concrete filled at the end of the H-shaped steel beam and the H-shaped steel beam is increased, whereby the bending strength of the end of the H-shaped steel beam can be increased.

Further, according to the method for joining a concrete-filled steel pipe column to a PC beam according to the third aspect of the present invention, the concrete is continuously inserted into the inside of the steel pipe column only by press-fitting the filled concrete from the press-fitting hole 6 of the steel pipe column. Since the concrete is densely filled into the closed groove portion of the H-shaped steel beam from the opening hole, labor saving in the concrete press-in step can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view showing a joint structure between a column and a beam according to the present invention.

FIG. 2 is a view showing an opening hole formed in a steel pipe column of the present invention.

FIG. 3 is a perspective view showing a joint structure between a column and a beam according to the present invention.

FIG. 4 is a sectional view taken along the line VI-VI in FIG. 1;

FIG. 5 is a sectional view taken along the line VV in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Filled steel pipe concrete column 1a Steel pipe column 2 H-beam 2a Length end of H-beam 2b Upper flange of H-beam 2c Lower flange of H-beam 2d Web of H-beam 2e H Groove of section steel beam 3 Floor slab 4 Rib (projection) 5 Opening hole 6 Side plate 7 Partition plate 8 PC concrete section 9 PC steel wire 10a Concrete filled inside steel pipe column 10b In closed groove of H-section steel beam Filled concrete 11 Press-fit hole S Joint position

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04B 1/30 E04B 1/16 E04B 1/22

Claims (3)

(57) [Claims] 1. A joint structure between a filled steel pipe concrete column and a PC beam in which a pair of steel pipe columns filled with concrete are separated from each other and a beam is joined to a side portion between the steel pipe columns. The groove at the longitudinal end of the H-shaped steel beam is closed with an opening provided only at the extreme end, and the opening is formed at the joint position where the opening of the steel pipe column is drilled. The ends of the H-shaped steel beam are fixed while covering, and both ends of the PC steel wire arranged along the web while passing through the closed groove of the H-shaped steel beam are connected to the steel pipe column. While being connected, concrete is continuously filled into the entire inside of the steel pipe column and the inside of the closed groove of the H-shaped steel beam through the opening at the joint position, and the H-shaped steel is tensioned by the PC steel wire. Prestress is introduced into the concrete inside the groove of the beam Joint structure between tessellations steel concrete column and PC beam characterized and. 2. The joint structure between a concrete-filled steel tubular column and a beam according to claim 1, wherein a number of projections are formed on an upper surface of a lower flange of the H-shaped steel beam. Structure of the joint between a filled steel pipe concrete column and a PC beam. 3. A method of arranging a pair of steel pipe columns filled with concrete inside a pipe and joining a PC beam to a side portion between the steel pipe columns, first, a longitudinal direction of an H-shaped steel beam. The groove on the end side is closed in a state where an opening is provided only on the outermost side, and an opening is drilled at a joint position of the steel pipe column. In the covered state, it is fixed to the joint position of the steel pipe column, and the PC steel wire is arranged along the web while passing through the closed groove of the H-shaped steel beam, and both ends are connected to the steel pipe column. Then, press the filled concrete from the bottom of the steel pipe column,
Concrete is densely filled in the entire inside of the pipe of the steel pipe column, and concrete that has flowed into the H-shaped steel beam from the opening hole of the steel pipe column is densely poured into the closed groove, and finally, after the concrete hardens, A method of joining a concrete-filled steel pipe column and a PC beam, wherein the PC steel wire is tensioned.