JP2744212B2 - Column and beam connection and connection method - Google Patents

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 strips are wound around a portion corresponding to the column cap of a column main reinforcing bar of a column reinforcing bar assembly and welded, and the side face of the strip is wound. A steel beam for the end is welded in a cross, c-shape or L-shape when viewed from above, and then a formwork for forming the column surface is installed on the column and the column head to form concrete.

As another connection part or connection method, there is one described in JP-A-3-281844. The connection unit is composed of a pair of upper and lower rectangular horizontal diaphragms and a steel pipe having a horizontal cross-sectional rectangular shape that integrally connects the two diaphragms. Each of the upper and lower horizontal diaphragms has a large concrete filling hole formed in the center. In addition, a 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
Welding is performed at a predetermined height of the column capital, and the end face of the horizontal diaphragm or the end of the mounting plate provided on the side surface of the steel pipe is projected from the column face, and the 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, concrete is poured into the steel pipe from the concrete filling hole at the center of the horizontal diaphragm, so that it is difficult to fill the steel pipe without any gaps, and the horizontal diaphragm is connected to a reinforcing bar assembly. When inserting into a main column, the main column must be passed through each column main bar insertion hole, and the insertion work is troublesome.

In addition, since the steel pipe is exposed to the outside even after concrete molding, a water-resistant film must be formed on the surface of the steel pipe to protect it from rain and the like. The ends of the long span steel beams are connected to the ends of the upper and lower horizontal diaphragms by welding or bolts at the site, and the connecting operation takes time.

[0010]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that a steel pipe having a rectangular horizontal cross section and upper and lower end faces of the steel pipe are provided at a connecting portion between a reinforced concrete column and a steel beam. A cross-shaped reinforcing plate fixed to the
When viewed from above, a connecting unit is formed from a steel tube and an end steel beam fixed to the reinforcing plate in a cross-shaped, c-shaped or L-shaped arrangement, and the connecting unit is formed by arranging the steel pipe portions in a rectangular shape. The steel beam for the end is covered with the outer periphery of the column head of the column main bar and embedded in the concrete column together with the column main bar, and the end steel beam projects outward from the concrete wall surface and has the same cross-sectional shape as the end steel beam. The beams are connected and supported.

According to a second aspect of the present invention, in the method of connecting a reinforced concrete column and a steel beam, a column reinforcing bar assembly in which main column reinforcing bars are arranged in a rectangular shape is erected to form a column surface around the column reinforcing bar assembly. The formwork is installed, and a cross,
Insert the steel pipe of the connection unit, which is formed by integrally fixing a steel beam for the end portion in a T-shape or L-shape and a pair of upper and lower cross-shaped reinforcing plates, from above so as to surround the outer periphery of the main bar of the column. It is supported on the upper end, a formwork for forming a connection portion is installed around the connection portion unit, concrete is poured into both the formworks, and the pillar and the connection portion are simultaneously formed into concrete.

According to a third aspect of the present invention, there is provided a method for connecting a reinforced concrete column and a steel beam, wherein a column reinforcing bar assembly in which main column reinforcing bars are arranged in a rectangular shape is erected, and a column surface having an upwardly open concave portion at an upper end portion; A common formwork for forming the connection part is installed around the column rebar assembly, and a steel pipe with a rectangular cross section is integrated with a cross-shaped, T-shaped or L-shaped end steel beam and a pair of upper and lower cross-shaped reinforcing plates. The steel pipe of the connection unit that is fixed to
Insert it from above to surround the outer circumference of the column main bar, insert and support the steel beam for the end into the recess, fill the gap between the recess and the steel beam for the end with the auxiliary formwork, and inject concrete into the common formwork The pillar and the connecting part are simultaneously concrete-molded.

According to a fourth aspect of the present invention, in the method for connecting a reinforced concrete column and a steel beam, a hollow precast concrete column having a column main bar arranged in a rectangular cross section is erected, and the column main bar corresponding to the column cap is provided. The above-mentioned steel pipe of a connection unit, in which a steel pipe having a rectangular cross section and a steel beam for an end arranged in a cross, a T-shape or an L-shape, and a pair of upper and lower cross-shaped reinforcing plates are integrally fixed to the upper protruding portion, Insert it from above so as to surround the outer periphery of the main reinforcement and support it at the upper end of the precast concrete column, install a formwork for the connection around the connection unit, inject concrete into the formwork, and The hollow part and the connection part are simultaneously molded in concrete.

[0014]

FIG. 1 is an exploded perspective view of a connection unit 3 used in the present invention.
It comprises a pair of cross-shaped horizontal reinforcing plates 2 and four end steel beams 5 arranged in a cross shape.

The steel pipe 1 is obtained by selecting a desired size from commercially available standard products and cutting it. In this embodiment, as shown in FIG. 2, the inner diameter of the steel pipe 1 corresponds to the rectangular arrangement of the column main bars 11. The size is selected, and the cutting dimension is adjusted according to the vertical length of the web 6 of the steel beam 5 as shown in FIG.

Cross-shaped ribs 8 are integrally welded to opposing surfaces of the two reinforcing plates 2, and each length of the reinforcing plate 2 in the front-rear and left-right directions is larger than the front-rear left-right width of the steel pipe 1. Although formed, the length of the rib 8 is a length corresponding to the inner diameter of the steel pipe 1 and also serves as a positioning member. The ribs 8 are positioned by being fitted into the steel pipe 1, and the reinforcing plate 2 is welded to the upper and lower end surfaces of the steel pipe 1.

As the steel beam 5 for the end portion, the same working steel as the steel beam 4 for the intermediate span (FIG. 10) is used.
As shown in the figure, the reinforcing plate 2 is arranged on four sides of the steel pipe 1 in such a manner as to extend the cross, and is welded to the end face of the reinforcing plate 2 and the side surface of the steel pipe 1.

By welding the cruciform reinforcing plate 2 and the ribs 8 to the steel pipe 1, cocrete filling holes and pillar main bar insertion holes 10 are formed at four corners of the steel pipe 1.

In FIG. 3, which shows a front view, the welded end face of the steel beam 5 for the end portion has its upper and lower flanges 7 cut off by a length corresponding to the protruding amount d of the reinforcing plate 2. The end face of 7 is in contact with the end face of the reinforcing plate 2, and the end face of the web 6 is in contact with the side face of the steel pipe 1, and are welded to each other.

For example, in FIG. 2, when the column width D1 is 800 mm, the distance from the column core C1 to the tip of the steel beam 5 for the end portion is 1 as shown in FIG.
m. Therefore, the amount of protrusion D2 of each end steel beam 5 from the column surface is 600 mm. The meaning of the above 1 m means that, for example, when a 6 m intermediate span steel beam 4 is bridged at a position where the distance between the column cores is 8 m, the end steel frame is projected to a position protruding 1 m from each of the left and right column cores. This is because the beam 5 needs to be extended.

FIG. 4 shows a horizontal cross section of the column 30,
In the column 30, a plurality of columns (for example, 1
(2) pillar main bars 11 and band bars 12 which bind the whole of them.
In addition, a reinforcing bar assembly 13 composed of reinforcing stirrups 12a partially connected in a cross shape is built in. As shown in FIG. 5, the steel pipe 1 of the connecting unit 3 is connected to a column reinforcing bar assembly 13 of a column head. Are fitted to the outer periphery of the column main bar 11 and are connected by concrete 15.

At the outer end of each end steel beam 5, an end of the intermediate span steel beam 4 is provided with an iron plate 16 and a high-tensile bolt 17.
Etc., and are supported.

The connection method will be described. 6 to 12 show a connection method according to a second aspect of the present invention.

(1) In FIG. 6, a reinforcing bar assembly 13 previously assembled in a factory or the like is connected to the upper end of the column main bar 19 on the foundation side or the lower floor by welding using a sleeve or the like. At this stage, the stirrup 12 of the reinforcing bar assembly 13 is fixed in a range lower than the height H1 corresponding to the lower edge of the beam, and has not yet been fixed in a range above the capital.

(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 pillar main bar 11 is inserted into the insertion holes 10 at the four corners of the connection unit 3.

(4) In FIG. 9, as shown by the imaginary line, a connecting portion (column capital) formwork 22 is set above the columnar surface forming form 20 so as to surround the connecting portion unit 3. .

(5) FIGS. 11 and 12 show the connection form 2
2, the mold 22 is divided into four L-shaped members as viewed from above as shown in FIG.
The end face of each L-shaped member is formed so as to follow the cross-sectional shape of the end steel beam 5 having a sectional shape as shown in FIG. 12, and the end steel beam 5 is sandwiched from both sides without gaps. I have.
Thereby, as shown in FIG. 9, each end steel beam 5 projects from the formwork 22.

(6) Concrete is poured into the molds 22, 20 from above, for example, and the columns 30 and the connecting portions (column heads) 30a are formed into concrete as shown in FIG. In this case, concrete is filled into the upper mold 22 and the mold 20 through the concrete filling holes 10 at the four corners shown in FIG.

(7) 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. In addition, although not shown, the stirrup 12 is welded to the column main reinforcement 11 above the connection portion 30a.

[0031]

13 and 14 show a connection method to which the invention according to claim 3 of the present invention is applied. A common method including a column cap as a formwork for a rebar assembly already installed is shown. This is a method of installing the formwork 24.

The common mold 24 has a slab lower surface (upper beam end).
It is a formwork extending to the upper end, and has concave portions 25 for supporting the insertion of steel beams for end portions on four surfaces at the upper end.

That is, after the rebar assembly 13 is installed as shown in FIG. 6, the common form 24 is attached to the assembly 13 as shown in FIG.
The connection unit 3 is inserted from above into the column main bar 11 and supported by the recess 25 as shown in FIG.

However, in this state, since both side groove portions of the end portion steel beam 5 are vacant, the auxiliary plate 26 for closing the vacant portion is attached to the formwork 24.

The common formwork 24 may be a method of combining four members having an L-shaped horizontal cross section as in the case shown in FIG.

[0036]

Embodiment 3 of the third method is a method to which the invention according to claim 4 is applied. As shown in FIG. 15, a hollow precast concrete containing a reinforcing bar assembly 13 having column main bars arranged in a rectangular cross section is incorporated. This is a connection method using the pillar 29. That is, a hollow precast concrete column 29 having a column rebar of a column cap naked is erected, and the connecting unit 3 is inserted into the main column main bar 11 of the hollow precast concrete column 29 from above, and the upper end of the concrete wall is formed. Support with.

Thereafter, a form similar to that shown in FIG. 11 and FIG. 12 for a capital is installed around the connection unit,
Concrete is poured into the formwork, and the hollow portion and the connection portion of the precast concrete column 29 are simultaneously formed into concrete.

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

[0039]

[Other Embodiments] In the above embodiments, the connecting portions and the connecting method for connecting the steel beams on all sides are shown. Applicable.

[0040]

As described above, according to the first aspect of the present invention, (1) the upper and lower reinforcing plates 2, the steel pipe 1, and the end steel beams 5 are integrally connected in a cross shape or the like. To form a connection unit 3 and concrete-mold it together with the beam rebar assembly 13, and connect the intermediate span steel beam 4 to the end of each end steel beam 5. The reinforcing plate 2 and the steel pipe 1 are firmly connected to each other through the reinforcing plate 2 and the stress is reliably transmitted to the column 30.

(2) Since the upper and lower reinforcing plates 2 are formed in a cross shape, concrete filling holes 10 are formed at the four corners, and the opposing steel beams 5 for end portions are formed straight without interruption. Since it is connected in a continuous state, concrete filling can be performed more reliably and the connection strength between steel beams can be improved as compared with the conventional one equipped with a horizontal diaphragm having a concrete filling hole in the center. improves.

(3) Since the end steel beam 5 having the same cross-sectional shape and a certain length as the intermediate span steel beam 4 is previously integrated into the connection unit 3 in advance, it is fixed between the columns. The connection with the intermediate steel beam 4 of the shaku is easy and accurate, and the connection work of the intermediate steel beam on site is easy.

(4) Since the steel column is used to connect the column and the steel beam 5, the steel beam can be easily mounted, and the strength is improved as compared with the conventional case where the strip is welded. I do.

According to the method of the present invention,
In addition to the effects similar to the above (1) and (3), there are also the following effects. (1) Since the connection unit 3 is placed on the upper end of the concrete part of the pillar formwork 20 or the hollow precast concrete column 29, no special positioning and supporting mechanism is required, and the connection unit is simply and accurately installed on site. 3 can be mounted and positioned, thereby improving work efficiency.

[Brief description of the drawings]

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

FIG. 2 is a plan view of a connection unit alone.

FIG. 3 is a front view of a connection unit.

FIG. 4 is a horizontal sectional view of a pillar.

FIG. 5 is a transparent front view of a beam-column connection part (column cap) to which a connection part 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 operation process of a column surface forming mold according to the second embodiment.

FIG. 8 is a longitudinal sectional view of a connecting unit mounting step in the invention according to claim 2;

FIG. 9 is a vertical cross-sectional view showing a step of installing a formwork for a connecting portion according to the second aspect of the present invention.

FIG. 10 is a front view showing a connecting work process of the intermediate steel beam in the invention according to claim 2;

FIG. 11 is a plan view showing a step of assembling a form for a connecting portion according to the invention of a reinforcing bar assembly.

FIG. 12 is a front view of FIG. .

FIG. 13 is a front view showing a common form setting work process in the invention according to claim 3;

FIG. 14 is a front view showing a step subsequent to that of FIG.

FIG. 15 is a front view showing a mold setting work process in the invention according to claim 4;

[Description of Signs] 1 Steel pipe 2 Reinforcement plate 3 Connection unit 4 Intermediate steel beam (fixed-length steel beam) 10 Concrete filling and column main reinforcing bar insertion hole 11 Column main reinforcing bar 13 Column reinforcing bar assembly 20 Column surface forming form 22 Connecting portion Formwork 24 common formwork 25 recess 29 hollow precast concrete column

Claims (4)

(57) [Claims] At a connecting portion between a reinforced concrete column and a steel beam, a steel pipe having a rectangular cross section in a horizontal section, a cross-shaped reinforcing plate fixed to upper and lower end surfaces of the steel pipe, a cross, a T-shaped or an L-shaped arrangement as viewed from above. And a steel beam for an end portion fixed to the steel pipe and the reinforcing plate at a connection portion unit, and the connection portion unit has its steel pipe portion covered on the outer periphery of the column head of the column main reinforcement arranged in a rectangular shape. The end steel beam is embedded in the concrete column together with the column main reinforcement, and the end steel beam projects outward from the concrete wall surface to connect and support the intermediate steel beam having the same cross-sectional shape as the end steel beam. Column-to-column connection. 2. A method of connecting a reinforced concrete column and a steel beam, comprising: setting up a column reinforcing bar assembly in which main column reinforcing bars are arranged in a rectangular shape; and installing a formwork for forming a column surface around the column reinforcing bar assembly. A steel pipe having a rectangular cross section, a steel beam for an end in a cross, a T-shape or an L-shape, and a pair of upper and lower cross-shaped reinforcing plates are integrally fixed to each other. Insert it from above so as to surround it and support it at the upper end of the formwork, install a formwork for forming the connection around the connection unit, inject concrete into both forms, and simultaneously concrete the pillar and the connection part A method for connecting columns and beams, characterized by being formed. 3. A method for connecting a reinforced concrete column and a steel beam, comprising: a column reinforcing bar assembly in which main pillars are arranged in a rectangular shape; A connection in which a formwork is installed around a column rebar assembly, and a steel pipe having a rectangular cross section is integrally fixed with a steel beam for an end portion having a cross, a T-shape or an L-shape and a pair of upper and lower cross-shaped reinforcing plates. The steel pipe of the unit is inserted from above so as to surround the outer periphery of the column main bar, and the end steel beam is inserted and supported in the recess, and the gap between the recess and the end steel beam is filled with the auxiliary formwork. A method of connecting a column and a beam, wherein concrete is poured into a formwork to simultaneously form a column and a connection portion with concrete. 4. A method of connecting a reinforced concrete column and a steel beam, wherein a hollow precast concrete column containing a column main bar arranged in a rectangular cross section is erected, and a cross section is formed at an upper protruding portion of the column main bar corresponding to the column head. Cross-shaped, T-shaped or L-shaped end steel beams and upper and lower
The steel pipe of the connection unit, which is formed by integrally fixing a pair of cruciform reinforcing plates, is inserted from above so as to surround the outer periphery of the main bar and supported on the upper end of the precast concrete column, and connected around the connection unit. A method for connecting a column and a beam, comprising: installing a formwork for a part, injecting concrete into the formwork, and simultaneously forming the hollow portion and the connection part of the precast concrete column into concrete.