JPH09125513A - Connection part of pillar and beam and connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stress transmission of a pillar and a beam and to improve working capacity on a connection part between the reinforced concrete pillar and the steelwork beam and a connection method. SOLUTION: A connection part unit 3 with openings S for concrete deposition existing on it four corners is formed of a steel pipe 1, a horizontal reinforcing plate fastened on upper and lower end surfaces of the steel pipe 1 and having a concrete deposition hole 8 on its center, a steelwork beam 5 for end parts arranged in a cross viewed from above and fastened on the steel pipe 1 and a side part reinforcing plate 7 rectangularly arranged. A pillar main reinforcement 11 on the outward side and a pillar core reinforcement 10 on the inward side are built in the reinforced concrete pillar, and a connection part unit 3 stores the pillar core reinforcement 10 in the steel pipe 1 and the pillar main reinforcement 11 between the steel pipe 1 and the side part reinforcing plate 7, and concrete is deposited in the side part reinforcing plate 7 and the inside of the steel pipe 1, the steelwork beam 5 for the reinforcement end parts is projected outward from the side part reinforcing plate 7 and connects and supports an intermediate steelwork beams of the same sectional shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting portion between a reinforced concrete column and a steel beam in a building and a connecting method.

[0002]

2. Description of the Related Art In a recent building, a structure in which reinforced concrete columns and steel beams are combined, that is, a so-called composite structure is employed to maintain the strength and reduce the weight of the building frame.

[0003] Specifically, by combining a reinforced concrete column excellent in compression resistance and buckling resistance with a steel frame beam light in weight, excellent in bending strength and long in span. Excels in earthquake resistance as a whole, and
It constitutes a connection part that is lightweight and can be made longer.

[0004] As a connecting portion or a connecting method of this kind of composite structure, conventionally, a plurality of rows of band plates are wound and welded around a column main bar of a column head of a column reinforcing bar assembly, and the side surface of the band plate is viewed from above. Weld the steel beam for the end into a cross, c-shape or L-shape,
After that, formwork for column surface formation is installed on the column and column capital,
Concrete molding.

As another connection part or connection method, there is one described in JP-A-3-281844. In this method, a connection unit is constituted by a pair of upper and lower rectangular horizontal diaphragms and a steel pipe having a horizontal cross-section that integrally connects the two diaphragms, and a concrete filling hole is formed in the center of each of the upper and lower horizontal diaphragms. In addition, a large number of main pillar insertion holes are formed in the outer peripheral end portion.

[0006] The connecting unit is inserted into the main column, and
The end of the horizontal diaphragm or the steel pipe and the steel pipe are exposed from the column surface by welding at a predetermined height of the column capital part, and an intermediate steel beam is connected to them.

[0007]

In the former connection part or connection method, the work of winding the strip and the welding work of the steel beam for the end portion must be performed at the work site at a high place. It takes a lot of time and labor to assemble.

In the latter connection part or connection method, the end of a long span steel beam is connected to the outer peripheral surface of the steel pipe or the ends of the upper and lower horizontal diaphragms by welding or bolts on site. It takes time to work.

[0009]

Means for solving the above problems are represented by the same reference numerals as those in the embodiment,
In addition, using the drawings, the invention according to claim 1 is characterized in that a steel pipe 1 as shown in FIG. Top and bottom 1 with concrete filling holes 8
A pair of horizontal reinforcing plates 2, an end steel beam 5 fixed to the steel pipe 1 in a cross-shaped, c-shaped or L-shaped arrangement when viewed from above, and a side reinforcing plate 7 having a shape corresponding to the outer peripheral surface shape of the column. By
As shown in FIG. 4, the connection unit 3 having openings S for filling concrete is formed at the four corners, and the reinforced concrete column has a plurality of column main bars 11 on the outer side and inner columns 11 on the inner side as shown in FIG. A plurality of column core reinforcements 10 are built in, and the connection unit 3 stores the column core reinforcements 10 in the steel pipe 1 and also between the steel pipe 1 and the side reinforcing plate 7 as shown in FIG. The side reinforcement plate 7 is provided for accommodating the column main bars 11 passing through the opening S.
Concrete is filled inside and inside the steel pipe 1,
The end steel beam 5 is characterized by projecting outward from the side reinforcing plate 7 to connect and support the intermediate steel beam 4 having the same cross-sectional shape as shown in FIG.

A second aspect of the present invention is characterized in that a steel pipe 1 having a rectangular horizontal cross section is used in the connection portion of the column and the beam according to the first aspect, as shown in FIG.

The invention according to claim 3 is characterized in that, in the connection portion of the column and beam according to claim 1, a steel pipe 1 having a circular horizontal cross section is used as shown in FIG.

According to a fourth aspect of the present invention, in the connection portion of the column-beam according to the first aspect, as shown in FIG. 5 or FIG. 8 is inscribed.

According to a fifth aspect of the present invention, in the method of connecting a reinforced concrete column and a steel beam, as shown in FIG. 7, a plurality of outer column main bars 11 and an inner plurality of column core bars 10 are provided.
And a column reinforcing bar assembly 13 having
A mold 20 for forming a pillar surface is placed around the periphery of the mold 3. As shown in FIG. 1, the connection unit 3 includes a steel pipe 1, an end steel beam 5 having a cross, a T-shaped or L-shaped arrangement, and a pair of upper and lower horizontal reinforcing plates 2 having a concrete filling hole 8 in the center. The side reinforcing plate 7 having a shape corresponding to the shape of the outer peripheral surface of the column is configured so that openings S for filling concrete exist at four corners. As shown in FIG. At the same time, the connecting unit 3 is inserted into the column reinforcing bar assembly 13 from above so that the column main reinforcing bar 11 is inserted between the side reinforcing plate 7 and the steel pipe 1 and in the opening S. In addition, concrete is injected into the side reinforcing plate 7, the steel pipe 1, and the formwork 20 from the filling opening S to simultaneously form the columns and the connection portions with concrete.

According to a sixth aspect of the present invention, in a method of connecting a reinforced concrete column and a steel beam, as shown in FIG.
Plural main bars 11 on the outer side and plural core bars 10 on the inner side
And a hollow precast concrete column 29 containing the above. The connection unit 3 is, as shown in FIG.
And a cross-shaped, c-shaped or L-shaped end steel beam 5
And a pair of upper and lower horizontal reinforcing plates 2 having a concrete filling hole 8 in the center, and side reinforcing plates 7 having a shape corresponding to the outer peripheral surface shape of the column, so that concrete filling openings S are present at four corners. As shown in FIG. 5, the connection unit is configured such that the column core bar 10 is inserted through the steel pipe 1 and at the same time the column main bar 11 is inserted through the opening S between the side reinforcing plate 7 and the steel pipe 1. 3 is inserted into the bare upper end portion of the hollow precast concrete column, and through the concrete filling hole 8 and the filling opening S, the inside of the side reinforcing plate 7, the inside of the steel pipe 1, and the formwork 2
It is characterized in that concrete is injected into the inside of the precast concrete column 29, and the hollow portion and the connection portion of the precast concrete column 29 are simultaneously formed into concrete.

[0015]

According to the first aspect of the present invention, (1) a pair of upper and lower reinforcing plates 2, a steel pipe 1, an end steel beam 5, and a side reinforcing plate 7 are formed in a cross shape. To form a joint unit 3 which is concretely formed together with the column reinforcing bar assembly 13, and the intermediate span steel beam 4 is connected to the end of each end steel beam 5. Therefore, the steel beams are firmly connected to each other via the reinforcing plates 2 and 7 and the steel pipe 1, and stress is reliably transmitted to the columns 30. In particular, since the column core bars 10 are also arranged inside the steel pipe 1, the number of the column core bars 10 which is smaller than the number of the outer column main bars 11 is increased. Axial force can be strengthened.

(2) Since the steel beam 5 for the end portion is preliminarily incorporated in the connecting portion unit 3, it can be easily and accurately connected to the fixed-length intermediate steel beam 4 which is installed between columns. It is easy to connect the intermediate steel beam on site.

(3) The outer side reinforcing plate 7 is formed in a shape corresponding to the outer peripheral surface shape of the column, and concrete is filled in the side reinforcing plate 7, so that the side reinforcing plate 7 Therefore, in addition to the role as a strength member in place of the strap, it also functions as a concrete formwork of the connection portion, thereby improving the strength and improving the efficiency of formwork assembling work.

(4) Since the steel tube 1 is used to connect the column and the steel beam 5, it is easy to mount the steel beam and the strength is higher than in the conventional case where the strip is welded. improves.

(5) The steel tube 1 is embedded in the column main bar 11 and the column core bar 10 is disposed in the steel tube 1, and the end steel beam 5 fixed to the steel tube 1 is attached to the side reinforcing plate 7 from inside the concrete. , The strength of the conventional capital is improved.

According to the second or third aspect of the invention, a commercially available inexpensive standard product can be used as the steel pipe, so that the material cost can be reduced.

According to the fourth aspect of the present invention, the column core bar 10
Is inscribed in the concrete filling hole 8 of the horizontal reinforcing plate 2, so that the positioning and fixing of the upper end of the column core bar 10 are easy.

According to the fifth and sixth aspects of the invention, the same effects as described above can be obtained, and the following effects can be obtained.

(1) Connect the connecting unit 3 to the column form 2
Since it is placed at the top of the concrete portion of the 0 or hollow precast concrete column 29, no special positioning and supporting mechanism is required, the connection unit 3 can be easily and accurately mounted and positioned on site, and the work efficiency is improved. .

(2) Since the connection unit 3 only needs to be inserted from above into the column main bars 11 and the column core bars 10 already installed, the work efficiency is further improved.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] FIG. 1 is an exploded perspective view of a connecting portion unit 3 according to the first and second aspects of the present invention, in which a steel pipe 1 having a rectangular horizontal cross section and a pair of upper and lower rectangular horizontal members are provided. It is composed of a reinforcing plate 2, four cross-shaped steel beams 5 for end portions, and four L-shaped side reinforcing plates 7 arranged in a rectangle corresponding to the column outer peripheral surface shape. .

The steel pipe 1 has a desired size selected from commercially available standard products and is cut. A steel pipe 1 having a size that can be easily accommodated in the column main bar 11 arranged in a rectangular shape in FIG. 5 is selected. The lower cutting dimension of the vertical width is adjusted to the vertical length of the web 5a of the end steel beam 5 in FIG.

The upper and lower horizontal reinforcing plates 2 are welded to the upper and lower end surfaces of the steel pipe 1 in a four-sided projecting state, and a prismatic core core insertion / concrete filling hole 8 is formed in the center thereof.

Engineering steel is used as the steel beam 5 for the end portion, which is arranged in a cross shape on the four faces of the steel pipe 1 and welded to the end face of the horizontal reinforcing plate 2 and the side face of the steel pipe 1.

The side reinforcing plate 7 is formed by welding four members formed in an L-shape as viewed from above into a rectangular shape as viewed from above as shown in FIG. The inner surface of the rectangle corresponds to the shape of the outer peripheral surface of the column, and is filled with concrete.

FIG. 4 is an overall view of the connection unit 3 after assembly. The steel pipe 1 is open to the outside through upper and lower concrete filling holes 8 and is surrounded by a side reinforcing plate 7. At the upper and lower ends of the four corners of the space, as shown in FIG. 5, there are openings S that are large enough to allow the three main pillars 11 at each corner to pass through with a margin.

FIG. 3 shows a horizontal section of the column 30.
A plurality of (eg, twelve) outer pillar main bars 11 arranged in a rectangular shape corresponding to the outer peripheral surface shape of the pillar are provided in the pillar 30.
A plurality of (four) column core bars 10 arranged in a rectangular shape inside the row (enclosure) of the column main bars 11, a band bar 12 for binding the entire column main bars, and a column core bar 10 A reinforcing bar assembly 13 including a reinforcing stirrup 12a that partially connects the straps 14 to be bound and the main pillars 11 in a cross shape is built in.

As shown in FIG. 5, the connection unit 3 is
The column core bar 10 is stored in the steel pipe 1, and the steel pipe 1 and the side reinforcing plate 7
The column main reinforcement 11 is housed in between, and the concrete 15 is filled in the side reinforcing plate 7 and the steel pipe 1 and joined.

In FIG. 2, the ends of the intermediate span steel beams 4 are joined to and supported by the outer ends of the end steel beams 5 by means of an iron plate 16 and high tension bolts 17.

[Second Embodiment] FIG. 11 shows an example in which a commercially available standard product having a circular cross section is used as the steel pipe 1. A horizontal reinforcing plate 2 having a concrete filling hole 8 at its center is welded to the upper and lower end surfaces of the steel pipe 1 in four directions, and a rib 18 is welded to the peripheral surface of the steel pipe 1 in four directions. The upper and lower end surfaces of each of the ribs 18 are welded to the horizontal reinforcing plate 2. The side reinforcing plate 7 is
As in the case of FIG. 1, four L-shaped members are formed in a rectangular shape corresponding to the outer peripheral surface shape of the column, each is welded to the steel beam 5, and openings S for inserting the main reinforcement of the column and filling concrete are secured at the four corners. Have been. Concrete is filled in the side reinforcing plate 7 and the steel pipe 1.

The inner column core bar 10 is in contact with the edge of the concrete insertion hole 8 of the steel pipe. Other structure is the first
This is the same as the embodiment.

[First Connection Method] FIGS. 6 to 12 show a connection method according to a fifth aspect of the present invention.

(1) In FIG. 6, a reinforcing bar assembly 13 previously assembled in a factory or the like is welded to the upper ends of the column main bar 19 and the column core bar 19a on the foundation side or the lower floor by using a sleeve or the like. Connecting. The reinforcing bar assembly 13 includes a column main bar 11 arranged in a rectangular cross section and a column core bar 10 arranged in a rectangular cross section inside the column main bar 11. At this stage, the stirrups 12, 14 of the reinforcing bar assembly 13 are fixed in a range lower than the height H1 corresponding to the lower edge of the beam.

(2) In FIG. 7, a formwork 20 for forming a column surface is installed around the reinforcing bar assembly 13 to a height corresponding to the lower end edge H1 of the beam, and reinforced by support columns 21 and the like.

(3) In FIG. 8, the connection unit 3 assembled in a factory or the like is inserted from above the reinforcing bar assembly 13 and installed on the upper end surface of the formwork 20. in this case,
As shown in FIG. 2, each column main bar 11 is inserted into the insertion holes S at the four corners of the connection unit 3, and the column core bar 10 is inserted into the steel pipe 1. Then, as shown in FIG. 8, the side reinforcing plate 7 is installed above the columnar surface forming frame 20 and is used as a formwork of the connecting portion, whereby the formwork from the lower end of the column to the connecting portion is formed. Be composed.

(4) In FIG. 5, concrete is poured from above into the concrete filling hole 8 of the horizontal reinforcing plate 2 and the openings S for introducing concrete at the four corners, into the steel pipe and the side reinforcing plate, and through the formwork through these. 20 is filled with concrete, and the columns 30 and the connecting portions in FIG. 9 are formed into concrete.

(5) The intermediate steel beam 4 is connected to and supported by the end steel beam 5. In addition, the upper slab is formed into concrete. Also, although not shown, the column main bar 11 above the connection portion is provided.
Further, the stirrups 12 and 14 are welded to the column core bar 10.

[Second Connection Method] A method to which the invention of claim 6 is applied, as shown in FIG. 10, an outer pillar main bar 11 and an inner pillar which are arranged in a rectangular cross section. Core 1
This is a connection method using a hollow precast concrete column 29 containing a reinforcing bar assembly 13 having a zero. That is, a hollow precast concrete column 29 having the column main bar 11 of the column cap naked is erected, and the connection unit 3 is inserted into the upper column main bar 11 and the column core bar 10 of the hollow precast concrete column 29 from above. , Supported by the upper end of the concrete wall.

Then, concrete is poured into the side reinforcing plate 7 and the steel pipe 1 from the concrete filling hole 8 and the column main bar insertion opening S shown in FIG. The hollow part of the pillar 29 and the connection part are simultaneously formed into concrete.

Then, the intermediate span steel beam 4 is joined to the column capital steel beam 5.

[Other Embodiments] In the above embodiments, the connecting portions and the connecting method for connecting the steel beams in four directions are shown. It can also be applied to a structure that is arranged at

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The overall dimensions of the connection unit 3 are set so that, for example, in FIG. 2, when the column width is 800 mm, the distance from the column core to the tip of the end steel beam 5 is 1 m. I have. Therefore, the projecting amount of each end steel beam 5 from the column surface is 600 mm. In addition, the meaning of the above 1 m is, for example, that the distance between the pillar cores is
This is because it is necessary to extend the end steel beam 5 to a position protruding 1 m from each of the left and right pillar cores when the 6 m intermediate span steel beam 4 is bridged at the position.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a connection unit applied to the first, second and fourth aspects of the present invention.

FIG. 2 is a transparent front view of a beam-column connection unit to which a connection unit is mounted.

FIG. 3 is a horizontal sectional view of a column.

FIG. 4 is a perspective view of a connection unit.

FIG. 5 is a plan view of a beam-to-column connection unit to which a connection unit is mounted.

FIG. 6 is a front view showing an installation process of the reinforcing bar assembly.

FIG. 7 is a vertical cross-sectional view showing an installation work step of the column surface forming mold according to the invention of claim 5;

FIG. 8 is a vertical sectional view of a connecting unit mounting step in the invention according to claim 5;

FIG. 9 is a front view showing a connecting operation process of the intermediate steel beam in the invention according to claim 5;

FIG. 10 is a front view showing a working process in the invention described in claim 6;

FIG. 11 is a plan view of a beam-column connection portion to which the connection unit according to claim 3 is mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Horizontal reinforcing plate 3 Connecting part unit 4 Intermediate steel beam (standard-length steel beam) 5 End steel beam 7 Side reinforcing plate 8 Concrete filling hole 10 Column core bar 11 Column main bar 13 Column reinforcing bar assembly 20 Column surface Forming Formwork 29 Hollow Precast Concrete Column S Opening

Claims (6)

[Claims] 1. A connecting portion between a reinforced concrete column and a steel beam, a steel pipe, a horizontal reinforcing plate fixed to upper and lower end surfaces of the steel pipe and having a concrete filling hole in the center, a cross, a T-shaped or L-shaped when viewed from above. With the end steel beam fixed to the steel pipe in the arrangement and the side reinforcing plate of the shape corresponding to the outer peripheral surface shape of the column, a connecting unit with concrete filling openings at the four corners is formed, and the reinforced concrete column Has a plurality of outer pillar main bars and an inner plurality of pillar cores, and the connection unit accommodates the pillar core in the steel pipe and connects the steel pipe and the side reinforcing plate. The column main reinforcement passing through the above-mentioned opening is housed in between, the concrete inside the side reinforcing plate and the inside of the steel pipe is filled, and the steel beam for the end protrudes outward from the side reinforcing plate and is the middle of the same cross-sectional shape. Connecting and supporting steel beams The connection part of the column and beam characterized by the above. 2. The beam-column connection section according to claim 1, wherein a steel pipe having a rectangular cross section is used. 3. The column-beam connection according to claim 1, wherein a steel pipe having a circular horizontal cross section is used. 4. The beam-column connection part according to claim 1, wherein the inner column core bar is arranged so as to be inscribed in the concrete filling hole of the horizontal reinforcing plate. 5. A method of connecting a reinforced concrete column and a steel beam, comprising: setting up a column reinforcing bar assembly having a plurality of outer column main bars and a plurality of inner column core bars; A formwork for forming a pillar surface is installed around the three-dimensional structure, and a steel pipe, a steel beam for an end portion arranged in a cross, a T-shape or an L-shape, a pair of upper and lower horizontal reinforcing plates having a concrete filling hole in the center, and a pillar With the side reinforcing plate of the shape corresponding to the outer peripheral shape of the, a connection unit having openings for filling concrete at the four corners is formed, and at the same time the column core is inserted through the steel pipe and the side reinforcing plate and the steel pipe The connection unit is inserted from above into the column rebar assembly so that the column main reinforcement passes through the opening at above, and concrete is inserted into the side reinforcing plate, the steel pipe, and the formwork from the concrete filling hole and the filling opening. Pour the concrete at the same time A method of connecting columns and beams, characterized in that the columns are formed. 6. A method of connecting a reinforced concrete column and a steel beam, wherein a hollow precast concrete column including a plurality of outer column main bars and a plurality of inner column core bars is erected, and a steel pipe and a cross are provided. Four corners are filled with concrete beams at the four corners by means of a steel beam for the end of a T-shaped or L-shaped arrangement, a pair of upper and lower horizontal reinforcing plates having a concrete filling hole in the center, and side reinforcing plates having a shape corresponding to the column outer peripheral surface shape. The connection unit is formed by hollow precast concrete so that a column core bar is inserted through the steel pipe, and at the same time, the column main bar is inserted between the side reinforcing plate and the steel pipe and the column main bar is inserted through the opening. Insert the concrete into the side reinforcement plate and formwork from the above concrete filling hole and filling opening by inserting it into the bare upper end of the column, and connect the hollow part and the connection part of the precast concrete column. A method of connecting columns and beams, wherein concrete is simultaneously formed.