JP2956435B2 - Connection unit between reinforced concrete columns and steel beams - 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 unit serving as a connecting structure at a portion where a reinforced concrete column and a steel beam intersect, and in particular, a horizontal steel member made of H-shaped steel connected to the steel beam is used for a reinforced concrete column. The present invention relates to a through-beam type connection unit that penetrates.

[0002]

2. Description of the Related Art As a structure of a connection portion between a reinforced concrete column and a steel beam, a beam penetration type as shown in FIG. 1 is one of typical ones. This is mainly a steel beam side at the intersection, and as shown in FIG. 1 (A), a horizontal steel frame member 1 made of H-shaped steel having steel beams connected to both ends penetrates the reinforced concrete column 2. . That is, reinforced concrete columns 2 are constructed below and above the horizontal steel frame member 1 which is a part of the steel beam.

[0003] In a simple beam penetrating type connection structure as shown in FIG. 1 (A), when a large bending force acts on a column via a beam as shown by an arrow a, for example, the upper and lower flanges of the horizontal steel frame member 1 are connected. There is a problem that the b portion and the c portion of the reinforced concrete column 2 in contact with each other are easily crushed by bearing. Therefore, as shown in FIG. 1B, a structure is known in which a reinforcing steel pipe member 3 is vertically penetrated and integrally attached to an intermediate portion of the horizontal steel frame member 1 (Japanese Utility Model Publication No. 61-34404). By embedding the steel pipe member 3 attached in this manner in the reinforced concrete column 2, a part of the bending stress generated in the column is borne by the steel pipe member 3, thereby suppressing the bearing failure of the column concrete as described above. Can be.

[0004]

As shown in FIG. 1B, in a conventional structure in which a reinforcing steel pipe member 3 is integrally attached to a horizontal steel frame member 1 by penetrating and crossing the same, such a structural unit (a connection) The production of the unit was very troublesome, and the production cost was high and not practical. That is, drilling is performed so as to penetrate the upper and lower flanges and the intermediate web of the horizontal steel frame member 1 made of H-shaped steel (a part of the horizontal plane of the flange and the vertical plane of the web is cut out), and the steel pipe member 3 is penetrated into the hole. Weld both. Such processing is rather cumbersome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to effectively suppress bearing bearing breakage of a reinforced concrete column at a joint portion, and at the same time, it is easy to manufacture and low in cost. It is to provide a simple connection unit.

[0006]

According to the present invention, there is provided a connection unit comprising: a horizontal steel frame member made of H-shaped steel having steel beams connected to both ends thereof;
Each having a flange, comprising a cross-shaped steel frame vertically welded to the upper flange of the central portion in the longitudinal direction of the horizontal steel member, an upper vertical steel member embedded in a reinforced concrete column above the connection portion, Cross section is cross-shaped
Each web has a flange at the tip thereof and is formed of a cross-shaped steel frame which is vertically welded to a lower flange at the center in the longitudinal direction of the horizontal steel frame member, and is embedded in a reinforced concrete column below the connection portion. And a steel member.

[0007]

[Function] The cross section has a cross shape, and the tip of each web is furan.
The upper vertical steel frame member and the lower vertical steel frame member each comprising a cross-shaped steel frame having a zigzag are embedded in a reinforced concrete column, thereby forming a column between each of the webs and the flange.
Concrete is sandwiched between the concrete
From upper to lower vertical steel members
Stress is transmitted to the concrete
Part of the bending stress is due to the upper vertical steel member and the lower vertical steel
It is surely loaded on the bone members, and has the effect of supporting bearing destruction of the column concrete at the portions in contact with the upper and lower flange surfaces of the horizontal steel member.
It can be results suppressed. Further, since both the vertical steel members are welded to the upper and lower flange surfaces of the horizontal steel members, it is not necessary to form through holes for attaching the steel pipe members to the horizontal steel members as in the related art.

[0008]

2 and 3 show the construction of a basic embodiment of a connection unit according to the present invention. The connection unit shown in both figures has a horizontal steel frame member 1 made of H-shaped steel to which steel beams are connected at both ends, and a cross welded vertically to an upper flange 1a at the center in the longitudinal direction of the horizontal steel frame member 1. An upper vertical steel member 4a embedded in the reinforced concrete column 2 above the connection portion, and a cross-shaped steel frame vertically welded to the lower flange 1b at the center in the longitudinal direction of the horizontal steel member 1. The lower vertical steel member 4b embedded in the reinforced concrete column 2 below the connection part
It is provided with.

The vertical steel members 4a and 4b are formed by welding two T-shaped steels along the center line thereof on both sides of, for example, an I-shaped steel web. It is a cross-shaped steel frame having The lower end of the upper vertical steel member 4a is joined and welded to the upper surface of the flange 1a of the horizontal steel member 1, and the upper end of the lower vertical steel member 4b is joined and welded to the lower surface of the flange 1b of the horizontal steel member 1. By embedding the upper vertical steel member 4a and the lower vertical steel member 4b in the reinforced concrete column 2 as shown in FIG. 3, both of the steel members 4a and 4b bear a part of the bending stress generated in the column,
It is possible to suppress bearing breakdown of the column concrete at a portion in contact with the upper and lower flange surfaces of the horizontal steel frame member 1.

[0010] As shown in Fig. 3, the procedure of constructing a reinforced concrete column 2 by arranging the connection unit at a predetermined portion of the column is not particularly different from the conventional one. That is, the connection unit is arranged at the upper end of the column formwork, and the column formwork is further provided on the upper end thereof. At this time, a formwork that is continuous with the formwork for the pillar is also installed around the center of the joint unit,
If a concrete closing plate member corresponding to the formwork for the connection portion is attached to the connection unit in advance, construction on site can be simplified. Such an embodiment is shown in FIG.
In other words, in FIG. 4, a closing plate member 5 a made of an iron plate bent in a U-shape around the horizontal steel frame member 1 so as to surround the periphery of the web at the center in the longitudinal direction of the horizontal steel frame member 1,
5b is attached by welding, and the rectangular cylinder formed of the two closing plate members serves as a formwork when the concrete is poured into the connection portion of the reinforced concrete column 2. This formwork is left as a surface material of the pillar even after the concrete is hardened as a so-called throwaway formwork. Then, the closing plate members 5a and 5b also function as a reinforcing structure of the connection portion.

The above embodiment is a connection unit in the case where two steel beams and reinforced concrete columns which are on the same straight line intersect, but the present invention is not limited to such an embodiment. A connection unit between three steel beams and columns,
The present invention can be similarly applied to a connection unit of four steel beams and columns. FIG. 5 shows a configuration of a connection unit for four steel beams and columns. That is, in the embodiment of FIG. 5, two horizontal steel members 6a and 6b also made of H-shaped steel are orthogonally arranged and welded to both sides of the center of the horizontal steel member 1 in the connection unit having the configuration of FIG. Steel beams are connected to the horizontal steel members 6a and 6b, respectively. It is to be noted that a closing plate member serving as a mold as described with reference to FIG. 4 can be integrally attached to the embodiment of FIG.

[0012]

As described in detail above, by using the connection unit of the present invention, the cross section has a cross shape, and
By upper vertical steel members and lower vertical steel member made of cruciform steel having a flange at the tip of the probe is embedded in the reinforced concrete pillars, said each web the furan
Pillar concrete is sandwiched between
From concrete to upper vertical steel member and lower vertical steel frame
The stress is efficiently transmitted to the members,
Part of the bending stress generated in the REIT
And the lower vertical steel members are surely borne, and the bearing bearing failure of the column concrete at the portions in contact with the upper and lower flange surfaces of the horizontal steel members can be effectively suppressed. In addition, since both steel members are welded to the upper and lower flange surfaces of the horizontal steel members, there is no need to machine through-holes for attaching steel pipe members to the horizontal steel members as in the past, making it much easier than before. And therefore low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view of a conventional connection structure.

FIG. 2 is a perspective view of the connection unit according to the first embodiment of the present invention.

FIG. 3 is a schematic view showing a state where the connection unit of the embodiment is attached to a reinforced concrete column.

FIG. 4 is a perspective view of a connection unit according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a connection unit according to a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 horizontal steel frame member (H-shaped steel) 1a upper flange 1b lower flange 2 reinforced concrete column 3 steel pipe member (conventional) 4a upper vertical steel frame member (cross-shaped steel frame) 4b lower vertical steel frame member (cross-shaped steel frame) 5a, 5b closing plate member 6a , 6b Horizontal steel frame member (H-shaped steel)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-121425 (JP, A) Japanese Utility Model Showa 56-149703 (JP, U) Japanese Utility Model Showa 56-149705 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) E04B 1/16

Claims (2)

(57) [Claims] 1. An H in which steel beams are connected to both ends, respectively.
Horizontal steel frame members made of shaped steel and cross-shaped cross sections
An upper vertical steel frame having a flange at each end of a web, and comprising a cross-shaped steel frame vertically welded to an upper flange at a central portion in the longitudinal direction of the horizontal steel frame member, and embedded in a reinforced concrete column above the connection portion; The member and the cross section
Each cross-shaped web has a flange at the end
And a lower vertical steel member made of a cruciform steel frame vertically welded to a lower flange at a central portion in the longitudinal direction of the horizontal steel member, and embedded in a reinforced concrete column below the connection portion. Connection unit between reinforced concrete columns and steel beams. 2. A vertical plate member vertically attached to the horizontal steel frame member so as to surround a web at a central portion in a longitudinal direction of the horizontal steel frame member, and concrete is applied to a connection portion of the reinforced concrete column. The joint unit between a reinforced concrete column and a steel beam according to claim 1, further comprising a closing plate member serving as a form when casting.