JPH05302361A - Joining structure between column and beam - Google Patents

Abstract

PURPOSE:To provide a method for joining between a precast concrete column and a steel frame beam which improves work executing ability and reduces a construction cost. CONSTITUTION:Joining structure between a column and a beam comprises a precast concrete column 1 the column heat part of which has a cut beam, and a composite beam formed such that precast reinforced concrete 3 is wound around the end part of a steel frame 2. A composite beam is caused to span between column heads, and concrete is placed after the L-bent part of a lower end main reinforcing bar 4 or the composite beam is fitted in a panel zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of columns and beams, and more specifically to a joint structure of precast steel concrete columns and steel beams.

[0002]

2. Description of the Related Art In a precast steel-framed concrete structure, there are many cases where a steel beam is used partially because of a large span or the like. In addition, there are many requests to use steel beams when there is no work to be done for one span. In the case of a precast steel concrete column including a conventional steel beam a, as shown in FIG. 4, the boundary column b is a conventional steel reinforced concrete column b ′ and the adjacent girder c is a conventional partial precast steel reinforced concrete beam c ′ or part. It was a precast concrete beam of steel-framed reinforced concrete.

[0003]

In the above conventional structure, the weight of the steel frame is increased, the work at the site is increased, the PC conversion rate is lowered, and the entire process is adversely affected. The present invention has been proposed in view of the above problems of the prior art, the purpose of which is to eliminate the steel frame conventionally used for the purpose of the pillar, cost reduction and improved workability The point is to provide a beam joint structure.

[0004]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a joint structure of columns and beams according to the present invention comprises a precast concrete column in which beam formation is cut off at a column head, and a precast at a steel beam end. It is composed of a synthetic beam in which reinforced concrete is wound, the synthetic beam is erected between the pillar heads of the columns, and joint concrete is cast in the panel zone.

According to the second aspect of the present invention, only the beam ends are blocked so that the central portion of the steel frame beam is cut and assembled later.

[0006]

Since the present invention is constructed as described above,
If the column is reinforced concrete and the beam is a composite structure such as steel frame, a composite beam with precast reinforced concrete wound around the end of the steel beam should be installed between the column heads of the precast concrete column where the beam formation is deleted. The joint between the reinforced concrete column and the steel beam is
It is not necessary to provide a steel frame bracket in the shape of a cross or T in the joint of the beam, and the steel beam and precast reinforced concrete column can be joined by the same simple method as the conventional precast reinforced concrete joining. The construction of the members is easy.

According to the second aspect of the present invention, for some reason, when the beam center is post-constructed, both ends of the column are framed in a bracket shape and the central steel beam is retrofitted. it can.

[0008]

The present invention will be described below with reference to the illustrated embodiments. No. 1 is a precast concrete column with a beam-formation missing from the column head. Reference numeral 2 denotes a steel frame beam, and a composite beam in which a precast reinforced concrete 3 is wound around an end portion of the steel frame beam 2 is configured, and a lower end main bar 4 of the reinforced concrete 3 is projected from the end portion and bent into an L shape.

Thus, a pair of precast reinforced concrete 3 of steel beams 2 adjacent to the stigma of the pillar 1 is erected, and the L-shaped bent portion 4a of the lower end main bar 4 is fitted into the panel zone. Precast concrete columns and steel beams can be joined in the same manner as reinforced concrete joining by placing concrete-beam joint concrete in And are easily joined.

In the figure, 5 is a post-cast concrete slab. 2 and 3 show another embodiment of the present invention, in which 11 is a precast reinforced concrete column in which the beam is not formed in the pillar head, 12 is a steel beam joint block, and precast reinforced concrete is provided at the end of the steel beam 13 '. It is made of a composite beam in which 14 is wound.

In the figure, reference numeral 15 denotes a lower end main bar, the end portion of which is projected in an L shape. Reference numeral 16 is a stirrup, and 17 is a headed stud that is planted on the web of the steel beam 3. Thus, the precast reinforced concrete 14 at the end of the steel beam joint block 12 is erected on the column head of the precast reinforced concrete column 11, and at the column head, the L-shaped bent end 15a of the lower main bar 15 of the precast reinforced concrete 14 is in the panel zone. To be installed.

Reference numeral 14 'in the figure is a conventional precast reinforced concrete girder provided on the other beam erected on the column head, and is an L-shaped bent end portion 1 of a lower end main bar 15 of the girder 14'.
5a is arranged in the panel zone, and the pillar-beam concrete is placed in the panel zone. In the figure, 18 is a post-cast slab.

Since the illustrated embodiment is constructed as described above, in the area A located to the left of the joint of the steel beam in FIG. Alternatively, they can be joined by a method similar to the conventional joining method of precast reinforced concrete. Further, in the range of B located on the opposite side of A, even if the span is unsuccessful in construction, the post-construction is performed by the steel beam 13 ', so that it is lightweight and simple as a normal steel beam joint, which is advantageous in the process. Is.

[0014]

As described above, according to the present invention, it is possible to connect a precast reinforced concrete column and a steel frame beam with the same simplicity as a conventional precast reinforced concrete column beam. According to the invention of claim 2, when the central portion of the steel beam is cut and only the beam end is blocked, when the beam center is post-constructed, the post-construction is steel frame construction, so it is lightweight and joined. Is the same as an ordinary steel beam joint, which simplifies construction and is advantageous in terms of process.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a joint structure of columns and beams according to the present invention.

FIG. 2 is a vertical sectional view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing an end portion of a steel beam.

FIG. 4 is a vertical sectional view showing a conventional structure.

[Explanation of symbols]

 1 Precast Concrete Column 2 Steel Beam 3 Precast Reinforced Concrete 4 Bottom Main Bar 4a L-shaped Curved Part 5 Post-cast Concrete Slab 11 Precast Reinforced Concrete Column 12 Steel Beam Joint Block 13 Steel Beam 13 ′ Steel Beam 14 Precast Reinforced Concrete 14 ′ Precast Reinforced Concrete Large Beam 15 Main bar 15a L-shaped bent end 16 Stirrup 17 Headed stud

Claims (2)

[Claims] 1. A precast concrete column in which beam formation is cut off in a column head, and a composite beam in which precast reinforced concrete is wound around the end of a steel beam, and the composite beam is installed between the column heads of the column. The joint structure of pillars and beams is characterized in that joint concrete is placed in the panel zone. 2. The column-beam joint structure according to claim 1, wherein the steel beam has a central portion cut off and only the beam end portion is blocked.