JPH07158161A - Joint structure between reinforced concrete post and steel beam and joint member thereof - Google Patents

Abstract

PURPOSE:To provide a joint structure between a reinforced concrete post and a steel beam which ensures excellent machinability of structural steel and executability of concrete placement. CONSTITUTION:A fixture plate 2 is vertically welded with a steel pipe 1. A plurality of penetration hole 20 are installed to the fixture plate 2 in an area outside the steel plate 1 where post main reinforcements 40 are inserted. The fixture plate 2 is clamped with two nuts 6, 6 screwed into the post reinforcements 40, thereby binding each other. A joint plate 3 is welded with a joint unit with a steel beam 5 on the outside surface of the steep pipe 1, thereby providing joint structure based on structural steel alone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure and a joint member between a reinforced concrete column and a steel frame beam.

[0002]

2. Description of the Related Art In recent years, due to social background such as diversification of buildings and lack of skilled workers, so-called "mixed structure", especially "reinforced concrete column-steel beam frame (hereinafter RC-S)
"Frame and abbreviation)" is drawing attention. This is a mixed structure in which the columns are made of reinforced concrete and the beams are made of steel, and the advantages of each of the reinforced concrete structure and the steel frame structure are utilized, and the drawbacks of both structures are complemented with each other.

The key technology in the RC-S frame is concentrated on the details of the column-beam joints that have smooth stress transmission, secure proof stress, and good workability.

An example of a conventional joint structure is shown in FIGS.
In the figure, a pair of high-rigidity horizontal diaphragms 11 having a concrete filling hole 12 in the center and a through hole 13 of a column main bar 15 near the outer periphery are fitted to the beam of the steel beam B. By connecting with a steel pipe 14 of a length, and by penetrating the column main bar 15 through a through hole provided near the outer periphery of the horizontal diaphragm 11, the assembly of the horizontal diaphragm 11 and the steel pipe 14 is integrated with the reinforced concrete column A. Be combined.

When the reinforced concrete column A and the steel frame beam B are joined together, the steel frame beam is joined to the column outer peripheral projection portion of the diaphragm and the outer surface of the steel pipe so that the steel frame beam has a diaphragm. It is rigidly joined to the reinforced concrete column and the stress is transmitted between the column and the steel beam.

The steel pipe 14 has a function of setting the horizontal diaphragms of the upper and lower sides in accordance with the beam formation and restrains concrete when a large stress acts on the panel zone during an earthquake to improve the yield strength and toughness. It also has the function of increasing. That is, the steel pipe 4 restrains the concrete, and the concrete works to stop the buckling of the steel pipe, and exerts a synergistic effect.

[0007]

However, the conventional structure of the column-beam joint is a composite structure type in which the column main bar 15 of the reinforced concrete column A and the concrete fill the inside of the steel pipe 14. For this reason, there is a problem that the workability of the steel frame is poor due to the confusion between the steel frame and the reinforcing bar, and the workability of placing concrete is also poor.

[0008] Therefore, an object of the present invention is to solve the above problems and provide a joint structure between a reinforced concrete column and a steel beam, which provides good workability of steel frame and good workability of concrete placing. is there.

[0009]

In order to achieve the above object, in the joint structure of a reinforced concrete column and a steel frame beam according to the present invention, a fixing plate is welded to the upper and lower parts of a steel pipe, and the fixing plate is made of the steel pipe. An appropriate number of through-holes are provided in the outer diameter area, the threaded portion of the column main bar is inserted into the through-hole, and both sides of the fixing plate are fastened to each other with two nuts screwed to the threaded portion to connect them to each other. The side surface is characterized in that a joint plate is welded to the joint portion with the steel beam, and the steel beam is joined thereto.

Further, in the joining member of the reinforced concrete column and the steel beam according to the present invention, a fixing plate is welded to the upper and lower portions of the steel pipe, and the fixing plate is provided with a through hole through which the column main bar is inserted in the outer diameter region of the steel pipe. A joint plate is welded to the outer surface of the steel pipe at the joint with the beam.

[0011]

In the joint structure according to claim 1 and the joint member according to claim 2, since the column main bar is inserted through the steel pipe diameter outer region of the fixing plate, the steel beam is joined to the outer surface of the steel pipe through the joint plate. , A joint made of pure steel is constructed. Therefore, the workability of the steel frame is improved and the workability of concrete placement is also improved, as compared with the conventional structure in which the steel frame and the reinforcing bar are intricately combined. In addition, since the main pillar and the fixing plate are fastened to each other by sandwiching the fixing plate from both upper and lower sides with two nuts screwed to the threaded portion, the fixing main plate and the main fixing bar are vertically and bidirectionally connected. The stress is transmitted reliably.

[0012]

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIGS. 1 to 3 show an embodiment in which a joint portion made of pure steel is constructed with a focus on good workability. The joint structure between the reinforced concrete column and the steel beam is configured by using a joint member 10 assembled by welding the steel pipe 1, the fixing plate 2 and the joint plate 3 to each other.

The steel pipe 1 forms the core of the joining member 10, and the cross-sectional shape of the steel pipe may be circular or rectangular. In this embodiment, the steel pipe 1 has a rectangular cross section, and the steel pipe has an upper end and a lower end. The fixing plate 2 is welded to the. Then, the steel pipe outer diameter region 2a of the fixing plate 2,
That is, in a region where the fixing plate 2 protrudes outside the diameter of the steel pipe 1, a proper number of through holes 20 through which the column main bars 40 are inserted are formed around the steel pipe 1.

Further, a joint plate 3 is welded to the outer surface of the steel pipe 1 at the joint portion with the steel beam 5, here at the central portion. The joint plate 3 is provided so as to correspond to the width of the steel pipe outer diameter region 2a of the fixing plate 2, and the joint plate 3 is provided with an appropriate number of bolt mounting holes 30.

In the joining member 10 constructed as described above, the connection with the reinforced concrete columns 4 is performed by fixing the screw ends of the main bars 40 of the reinforced concrete columns 4 to the fixing plate 2 in each of the upper and lower fixing plates 2. The fixing plate 2 is inserted through the through hole 20 from the outside, and the upper and lower surfaces of the fixing plate 2 are tightened by two nuts 6 screwed to the threaded ends of the fixing plate 2 to be fastened and coupled to each other. At this time, it is better to tighten the nut 6 on the joining member side. Further, the main bar 40 may be divided in the joining member 10 or may be continuous. In any case, steel pipe 1
The main rebars 40 of the reinforced concrete columns 4 are inserted outside and fixed with screws, and the fixing plate 2 is not provided with the opening 7 for placing concrete, which is a big difference from the conventional one.

For connection with the steel beam 5, the flange is welded to the fixing plate 2 by the welding 8, and the web is the hole 30 of the joint plate 3.
Using bolts 9.

When the on-site joint is provided to the steel beam 5, the joint plate 3 is not provided, the steel beam 5 is processed as shown in FIG. 4, and the beam web is directly welded 8 to the steel pipe 1.

The joint portion constructed as described above is different from the conventional one in that it is made of only a steel frame material (steel pipe 1, fixing plate 2, joint plate 3). The stress transmission mechanism from the steel beam 5 to the joint is "through diaphragm type" in pure steel construction.
The stress transmission mechanism from the joint to the reinforced concrete column 4 is the same as that of the exposed column base made of pure steel. Therefore, it is considered that the design of this joint can be performed according to these.

In the stress transmission between the joint portion and the reinforced concrete column 4, when the friction force between the fixing plate 2 and the reinforced concrete column 4 is expected to be designed, when the friction force is insufficient, a checker is attached to the fixing plate. It is sufficient to use a plate in the shape of a circle. Further, the column main bar 40 and the fixing plate 2 are fastened and coupled by sandwiching the fixing plate 2 from both upper and lower sides with two nuts 6 and 6 screwed to the screw ends of the column main bar 40. It is possible to surely transmit stress to the main bar 40 in the upper and lower directions.
Therefore, the strength against vertical vibration can be improved as much as possible.

In consideration of the concrete pouring of the reinforced concrete columns 4, it may be convenient that the fixing plate 2 has an opening. However, in the present joining method, a circular shape is formed according to the stress of the steel beam 5. Alternatively, a rectangular opening 7 can be provided. In this case, the joint can also be designed as a composite structure of steel pipe and unreinforced concrete.

If the RC-S frame using the present joining method is applied to a building of a middle floor or higher, which has been conventionally planned for SRC construction or S construction, it can contribute to cost reduction.
This joining method can be applied to any half-precast, full-precast or cast-in-place reinforced concrete columns. Here, the nut 6 on the concrete column 4 side may be embedded in advance, or the end face around the main bar 4 may be attached to the nut 6 at the time of construction. Alternatively, first, the concrete pillar 4 may be attached to the screw end portion of the main bar 40 protruding from the end surface of the concrete pillar 4.
Side nut 6 is screwed and abutted against the end face, and in this state, the main bar 40 is inserted into the through hole 20 of the joining member 10 and the nut of the fixing plate 2 side is screwed and fastened and coupled to each other. The grout may be injected into the gap formed between the subsequent fixing plate 2 and the end face of the concrete column 4 by covering the periphery thereof with a mold or the like.

[0023]

In summary, according to the joint structure and the joint member of the present invention, the following excellent effects can be obtained.

Since the column main bars are inserted through the area outside the diameter of the steel pipe of the fixing plate and the steel beam is joined to the outer surface of the steel pipe via the joint plate, a joint portion made of pure steel frame is formed.
Therefore, compared to the conventional structure in which the steel frame and the reinforcing bar are intricate,
The workability of the steel frame will be good, and the workability of placing concrete will also be good. Further, the column main bar and the fixing plate are fastened and coupled by sandwiching the fixing plate from both upper and lower sides with two nuts screwed to the screw portion of the column main bar. It is possible to reliably transmit the stress.

[Brief description of drawings]

FIG. 1 is a front view showing a joint structure of the present invention.

FIG. 2 is a view showing a cross section of the joint structure of the present invention.

FIG. 3 is a perspective view showing a joining member of the present invention.

FIG. 4 is a partial front view showing another joint structure of the present invention.

FIG. 5 is a perspective view showing a conventional joint structure.

FIG. 6 is a sub-sectional view showing a conventional joint structure.

[Explanation of symbols]

 1 Steel Pipe 2 Fixing Plate 2a Outer Diameter Area 20 Through Hole Through which Column Main Bars Are Inserted 3 Joint Plate 30 Bolt Mounting Hole 4 Reinforced Concrete Column 40 Column Main Bar 5 Steel Beam 6 Fixing Washer / Nut 7 Opening 8 Welding 9 Bolt 10 Joining Member 11 Horizontal Diaphragm 12 Concrete filling hole 13 Through hole of column main bar 14 Steel pipe 15 Column main bar A Reinforced concrete column B Steel beam

Claims (2)

[Claims] 1. A fixing plate is welded above and below a steel pipe,
The fixing plate is provided with an appropriate number of through holes in the outer diameter region of the steel pipe, the screw portion of the column main bar is inserted through the through hole, and the two nuts screwed to the screw portion are used to fix the fixing plate. A joint between a reinforced concrete column and a steel beam, characterized in that both sides are fastened and connected to each other, and a joint plate is welded to the joint with the steel beam on the outer surface of the steel pipe, and the steel beam is joined to this. Construction. 2. A fixing plate is welded above and below the steel pipe,
The fixing plate is provided with a through hole through which the column main bar is inserted in the outer diameter region of the steel pipe, and a joint plate is welded to the outer surface of the steel pipe at the joint with the beam. Joining member with.