JPH0762740A - Joint method for precast steel framed reinforced concrete construction pillar and beam - Google Patents

Abstract

PURPOSE:To improve workability so as to be economically excellent, and improve reliability in construction. CONSTITUTION:In a joining method of PCa/SRC construction pillar A and beam B in which concrete is charged while exposing the flange outer faces of shape steel as structural material also used for a formwork, a joint plate 5 fitted to the pillar A and the web 10 of a beam steelwork 9 are fastened together through bolts 18, a diaphragm 6 fitted to the pillar A and the flanges 13 of the beam steelwork 9 are welded (w) in the field with each other. Beam joint reinforcements 7 buried in the pillar A are combined to beam main reinforcements 11 of the beam B, and cast-in-place concrete is placed on a joint part between the end part on the exposed side of the steelwork beam B and the outside part of a pillar steelwork 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a precast steel reinforced concrete structure (hereinafter referred to as PCa / SRC structure) column and beam.

[0002]

2. Description of the Related Art Conventionally, in this type of joining method, a reinforcing bar is laid on the outer periphery of a shaped steel, and all the steel materials are embedded in concrete. A common method is to join a PCa / SRC column in which a reinforcing bar is incorporated and the steel pipe is filled with concrete to a pure steel beam.

[0003]

However, in the former case, since the steel material is coated with concrete, the cross section of the member becomes large and the weight becomes heavy. In addition, it takes a lot of time to arrange the reinforcing bars, and a mold is required at the time of manufacturing. In the latter case, PCa
Since the beam member joined to the SRC column is a pure steel frame, the rigidity is low. If the rigidity is increased as a large span beam, the beam formation increases, the amount of steel increases, and the cost increases.

The present invention has been proposed in view of the above-mentioned problems of the prior art. The object of the present invention is to improve workability, economically excel, and structurally highly reliable PCa.
The point is to provide a method for joining SRC column beams.

[0005]

In order to achieve the above-mentioned object, according to the method of joining PCa / SRC column beam according to the present invention, a reinforcing bar is incorporated in a shaped steel which is a structural material also serving as a formwork,
When joining columns and beams of precast steel reinforced concrete made by exposing the outer surface of the flange of the same shape steel and filling with concrete, the joint plate attached to the columns and the web of the beam steel frame are bolted and attached to the columns. After welding the diaphragm and the flange of the beam steel frame in-situ, after connecting the beam joint bar projecting corresponding to the beam main bar embedded in the column and the beam main bar end of the beam, the beam end The cast-in-place concrete is placed at the joint between the side of the exposed steel beam and the outside of the column steel frame.

[0006]

According to the present invention, as described above, a PCa / SRC column beam is constructed by using a shaped steel as a structural material and a formwork, incorporating a reinforcing bar in the shaped steel and filling it with concrete. As a result, the cross section of the member is reduced and the weight is reduced. In addition, the PCa / SRC beam is not so large in its beam formation despite its high rigidity in which the reinforcing bars are incorporated in the beam steel frame.

Thus, the joint plate and the diaphragm attached to the column, the web and the flange of the beam steel frame end portion are joined by bolting and in-situ welding, and the exposed side portion of the steel beam at the beam end and the column steel frame are joined. Only the joints between them are constructed by cast-in-place concrete, and the columns and beams are easily joined. Further, in the present invention, the refractory coating is omitted or reduced on the steel frames of the columns and beams. In the event of a fire, the structure will withstand external forces as reinforced concrete due to the buried reinforcement and concrete.

[0008]

The present invention will be described below with reference to the illustrated embodiments. FIG. 7 shows a PCa / SRC column A, in which a column main bar 2 and a hoop 3 are arranged in a column steel frame 1 made of a shaped steel which is a structural material that is also used as a form and is composed of a square steel pipe or a circular steel pipe. A pillar concrete 4 is filled in the pillar steel frame 1.
Further, the pillar steel frame 1 has a joining plate 5 and an opening 6
a, a diaphragm 6 having a column main bar insertion hole 6b is attached, and a beam joint bar 7 is provided in the middle of the diaphragm 6 and the joint plate 5.

Reference numeral 8 in the drawing denotes a column reinforcing member such as a splice sleeve provided on the exposed end of the column main reinforcing bar. B is PCa
・ Web 10 in beam steel frame 9 made of H-shaped steel by SRC beam making
Upper and lower beam main bars 11 and stirrup 1 on both sides
2 is arranged, and beam concrete 14 is filled so that upper and lower flanges 13 and ends of the web 10 are exposed. (FIGS. 8-10) 15 is a bolt hole provided in the web, 16 is a beam main bar 11
A splice sleeve for connecting the column main bars, which is provided on the exposed part of the
Reference numeral 17 is a connecting surface. (FIG. 8) When the pillar A and the beam B are joined, as shown in FIGS.
The end web 10 of the beam steel frame 9 of the beam B is attached to the joining plate 5 attached to the column A, as shown in FIG.
Of the diaphragm 6 attached to the pillar A and the flange 13 at the end of the beam steel frame 9 are welded in place by welding
Then, the beam joint bar 7 embedded in the column A and the beam main bar 11 of the steel beam are joined by the splice sleeve 16. At this time, instead of the joint by the splice sleeve 16, they may be joined by enclosed welding. Further, a cast-in-place concrete 19 is placed between the connecting surface 17 at the end of the beam B and the outer side of the column steel frame 1, and thus the column A and the beam B are joined.

FIGS. 4 to 6 show another embodiment of the present invention, in which the column steel frame A of the PCa / SRC column A is made of H-shaped steel, and the column main bar extends over the flange and the web of the column steel frame A. The diaphragm 6 having the insertion hole 6b is arranged, and the hoop 3 is arranged on the main columnar bar 2 penetrating the insertion hole 6b. In addition, P is attached to the beam joint bar 7 that is inserted through the opposing flanges.
The beam main bar 11 of the Ca / SRC beam B is joined via a splice sleeve 16 or enclosed welding, and the web 10 of the beam steel frame is joined to the flange of the column steel frame 1 by the bolts 18 via the joining plate 5. 13 is welded to the flange of the pillar steel frame 1 and PCa / SRC
A cast-in-place concrete 19 is cast over the joint between the pillar A and the PCa / SRC beam B, and the pillar and the beam are integrally joined. In the figure, the same parts as those in the above embodiment are designated by the same reference numerals.

[0011]

In the present invention, as described above, the PC
Since the SRC column beam is constructed by exposing the outer surface of the flange of the section steel in the section steel which is a structural material that also serves as a formwork, the conventional SRC column beam in which the reinforcing bar is embedded in the concrete on the outer periphery of the section steel Compared with the above, the cross section of the member is reduced, the weight is reduced, the bar arrangement work is facilitated, the beam formwork can be partially used, and the on-site work is reduced and the construction period is shortened.

Further, since the SRC beam is constructed by incorporating reinforcing bars and filling it with concrete, the beam formation is reduced in comparison with the conventional member of pure steel beam, but the beam formation is reduced, the amount of steel material is saved, and the construction cost is reduced. Can be reduced. Further, since the rigidity is higher than that of the steel frame construction, it is advantageous in terms of vibration and sound insulation, and further, the fireproof coating is omitted or reduced in the steel frame section due to the heat capacity of the concrete section.

[Brief description of drawings]

FIG. 1 PCa / SR bonded by the method of the present invention
It is a longitudinal cross-sectional view which shows one Example of the junction part of C pillar beam.

FIG. 2 is a view taken along the line aa in FIG.

FIG. 3 is a view taken along the line bb of FIG.

FIG. 4 PCa / SR joined by the method of the present invention
It is a longitudinal section showing other examples of C pillar beam.

5 is a view taken along the line cc of FIG.

6 is a view taken along the line dd of FIG.

FIG. 7 is a vertical cross-sectional view of a PCa / SRC pillar.

FIG. 8 is a longitudinal sectional view of a PCa / SRC beam.

9 is a view taken along the line EE in FIG.

10 is a perspective view taken along the arrow in FIG.

[Explanation of symbols]

 A PCa / SRC column building B PCa / SRC beam building w Field welding 1 Column steel frame 2 Column main bar 3 Hoop 4 Column concrete 5 Joining plate 6 Diaphragm 6a Opening 6b Column main bar insertion hole 7 Beam joint bar 8 Splice sleeve 9 Beam steel frame 10 Web 11 Beam main bar 12 Stirrup 13 Flange 14 Beam concrete 15 Bolt hole 16 Splice sleeve 17 Joint surface 18 Bolt 19 Cast-in-place concrete

Claims (1)

[Claims] 1. A precast steel-framed reinforced concrete structure in which a reinforcing bar is incorporated in a shaped steel, which is a structural material that also serves as a formwork, and an outer surface of the flange of the shaped steel is exposed to fill with concrete. The joint plate attached to the column and the web of the beam steel frame are bolted together, and the diaphragm attached to the column and the flange of the beam steel frame are welded in-situ, and the protrusion is provided corresponding to the beam main bar embedded in the column. After connecting the beam joint bar and the end of the beam main bar of the beam, cast in-place concrete at the joint between the side part of the steel beam exposed at the beam end and the outer part of the column steel frame. Method for joining precast steel reinforced concrete column beams.