JP2000355976A - Column and beam jointing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column and beam jointing structure without deforming the main reinforcement of a beam by reducing a space in which no concrete is filled. SOLUTION: A reinforced concrete column 1 has a plurality of columnar main reinforcement 3 at certain intervals, a reinforced concrete beam 5 has at least more than two upper beam main reinforcement 6 at certain intervals mutually and more than two lower beam main reinforcement 7, end portions of upper beam main reinforcement 6 and lower beam main reinforcement 7 of the reinforced concrete beam 5 are so arranged without coming into contact with the ends of the upper beam main reinforcement and lower beam main reinforcement of other reinforced concrete beams, and bearing means 13 are provided at the end portion of the upper beam main reinforcement 6 and the lower mean main reinforcement 7, and concrete reinforcing means are provided for restricting the rupture of concrete placed in a jointing region when a tensile force acts or the reinforced concrete beam 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam-to-column connection structure, and more particularly to a connection structure between a reinforced concrete column and a reinforced concrete beam.

[0002]

2. Description of the Related Art A conventional joint structure between a reinforced concrete column and a reinforced concrete beam is described in, for example, FIGS.
The following are known.

In this joint structure, the column 20 is composed of a plurality of column main reinforcements 21 arranged at substantially equal intervals in a square shape, and a band reinforcement 22 extending in a substantially square shape so as to surround these column main reinforcements 21. A plurality of the stirrups 22 are arranged at an interval in the vertical direction, and the interval becomes coarse at a joint with the beam.

On the other hand, the first beams 23 extending in the horizontal direction as viewed in FIG. 1 and FIG. 2 are composed of a plurality of beam upper main bars 24 arranged at equal intervals in the horizontal direction, and disposed below the beam upper main bars 24. And a plurality of beam lower main reinforcements 25. Beam straps 26 extending so as to surround the beam upper main bar 24 and the beam lower main bar 25 are arranged at equal intervals along the length of the first beam 23.

[0005] Like the first beam 23, the second beam 27
A plurality of beam upper main bars 28 arranged at equal intervals in the horizontal direction
And a plurality of beam lower main bars 29 arranged below the beam upper main bar 28, and a beam band bar 30 extending to surround the beam upper main bar 28 and the beam lower main bar 29, They are arranged at equal intervals along the length of the beam 27.

[0006] As can be better understood from FIG.
Beam main reinforcements 24 and 25 of beam 23 and beam main reinforcement 2 of second beam 27
8 and 29 are arranged at right angles to each other, and the ends of these beam main reinforcements 24, 25, 28 and 29 are
3 and 27 extend into the joint area.

The ends of some of the upper beams 24 of the first beams 23 extend over some of the upper beams 28 of the second beams 27 and Are curved downward so as to pass between the beam upper main bars 28 to form a downward curved extension 31. Similarly, the beam lower main reinforcement 2 of the first beam 23
5 extend over some of the lower beam struts 29 of the second beam 27 to form a second beam 2.
7 is curved downward so as to pass between the beam upper main bars 29 to form a downward curved extension 32.

[0008]

However, in the above-described conventional joint structure, in the joint region between the column and the beam,
Column main bar 21, band bar 22, beam upper main bar 24, beam lower main bar 2
5. The beam upper main bar 28 and the beam lower main bar 29 are intricate, and these adjacent reinforcing bars, especially the beam upper main bar 2 of the first beam 23
4 and the beam upper main bar 2 of the second beam 27
8, and the lower curved extension 32 of the beam lower main bar 25 of the first beam 23 and the beam lower main bar 29 of the second beam 27 become dense. Thus, when concrete is poured in such a state in which the reinforcing bars are dense, a space where the concrete is not sufficiently filled may be generated in the joint area between the column and the beam.

When the end of the main bar of one beam is engaged with the end of the main bar of another beam, the upper main bar 28 and the lower main bar 29 are displaced from appropriate positions as shown in the figure. In some cases, desired beam cross-sectional performance could not be obtained.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to reduce the space where concrete is not filled and to displace the main reinforcement of the beam. An object of the present invention is to provide a joint structure with the above.

[0011]

To achieve the above object, according to the present invention, a beam-column joint structure for joining one reinforced concrete column and two or more reinforced concrete beams is provided, wherein the reinforced concrete columns are spaced apart from each other. Reinforced concrete beams, wherein each of the reinforced concrete beams has at least two or more beam upper main bars spaced apart from each other, and at least two or more beams located below the beam upper main bars spaced apart from each other. In the joint area between the reinforced concrete column and the reinforced concrete beam,
Ends of the beam upper main bar and the beam lower main bar of the reinforced concrete beam are arranged so as not to be in contact with ends of the beam upper main bar and the beam lower main bar of another reinforced concrete beam, and the beam extending to the joining region At the ends of the upper main bar and the beam lower main bar, the longitudinal cross-sectional area of the ends is increased, and when a tensile force acts on the reinforced concrete beam in a direction away from the reinforced concrete column, the tensile force is applied within the joining area. A supporting means for receiving the concrete in the concrete placed in the joint area by the supporting means when the tensile force acts on the reinforced concrete beam. Concrete reinforcement hand for preventing concrete poured into the joint area from being destroyed by stress Comprises, characterized in that.

According to the joint structure of the reinforced concrete column and the reinforced concrete beam having the above-described structure, the ends of the beam upper main bar and the beam lower main bar of the reinforced concrete beam are connected to the ends of the beam upper main bar and the beam lower main bar of the other reinforced concrete beams. When the concrete is poured, the concrete spreads well between the ends of the beam main reinforcement. Further, the bearing means provided at the ends of the beam upper main bar and the beam lower main bar, when a tensile force acts on the reinforced concrete beam in a direction away from the reinforced concrete column, the tensile force is applied to the joint area. Received in cast concrete. When such a tensile force acts on the reinforced concrete beam, the concrete reinforcing means prevents the concrete from being broken by the shear stress generated by the bearing means.

[0013] The ends of the beam upper main reinforcement and the beam lower main reinforcement of each of the reinforced concrete beams terminate at a position not exceeding a longitudinal center axis of the reinforced concrete column from a side wall surface of the reinforced concrete column extending therethrough. Is preferred.

Further, the ends of the beam upper main reinforcement and the beam lower main reinforcement of each reinforced concrete beam do not cross each other in the vertical direction with the ends of the beam upper main reinforcement and the beam lower main reinforcement of the other reinforced concrete beams. Are preferably arranged.

Further, the ends of the beam upper main reinforcement and the beam lower main reinforcement of each of the reinforced concrete beams extend from the side wall surface of the reinforced concrete column extending therethrough beyond the longitudinal center axis of the reinforced concrete column, and The beam upper main bar and the beam lower main bar of the reinforced concrete beam vertically intersect the ends of the beam upper main bar and the beam lower main bar of the reinforced concrete beam. It is preferable that the upper main bar and the end of the beam lower main bar are vertically spaced apart from each other.

Further, it is preferable that the bearing means is a nut screwed into a male screw formed at an end of the upper main bar and the lower main bar of the reinforced concrete beam.

Further, the concrete reinforcing means extends spirally along the longitudinal direction of the reinforced concrete column from above the joint region to below the joint region, and has an outer periphery in contact with the main bar of the reinforced concrete column. Preferably, it is a positioned spiral hoop streak.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In this embodiment, the present invention is applied to a joint structure of one column and two beams.

As shown in FIGS. 3 and 4, a joint structure for joining one reinforced concrete column and two reinforced concrete beams is indicated by reference numeral 1.

In this joint structure 1, the column 2 is composed of a plurality of column main reinforcements 3 arranged at substantially equal intervals in a square shape and a band reinforcement 4 extending in a substantially square shape so as to surround these column main reinforcements 3.
And a plurality of the stirrups 4 are arranged at an interval in the vertical direction, and the interval becomes coarse at the joint with the beam.

On the other hand, the first beams 5 extending in the lateral direction as viewed in FIGS. 3 and 4 are provided with a plurality of beam upper main bars 6 arranged at equal intervals in the horizontal direction and below the beam upper main bars 6. And a plurality of beam lower main reinforcements 7. A plurality of beam straps 8 extending so as to surround the beam upper main bar 6 and the beam lower main bar 7 are arranged at intervals along the length of the first beam 5.

Like the first beam 5, the second beam 9 is composed of a plurality of beam upper main bars 10 horizontally arranged at intervals.
And a plurality of beam lower main bars 11 arranged below the beam upper main bar 10. A beam band bar 12 extending to surround the beam upper main bar 10 and the beam lower main bar 11 is formed by a second band. It is arranged at intervals along the length of the beam 9.

In this embodiment, each of the beams 5, 9 is offset outward with respect to the longitudinal center axis of the column 2, and the side wall surface of each of the beams 5, 9 is flush with the side wall surface of the column 2. Are arranged as follows. When arranging the beams 5 and 9 in this manner with respect to the column 2, provided that the width of the beams 5 and 9 is the same,
Compared to the case where the beams 5 and 9 are arranged with respect to the column 2 so that the longitudinal axes of the beams 5 and 9 are aligned with the longitudinal axis of the column 2, the main reinforcements 6, 7, 10 and The main bars 6, 7, 10, 11 of such beams 5, 9 so that 11 do not cross each other.
Can be extended into the joint region J between the column 2 and the beams 5 and 9 (indicated by a dashed line in FIGS. 3 and 4).

Each end of the beam upper main reinforcement 6 and the beam lower main reinforcement 7 of the first beam 5 extends beyond the side wall surface 2a of the column 2 into the joining area J and is parallel to the side wall surface 2a of the column 2. , End at a position not exceeding an imaginary plane extending through the longitudinal central axis of the column 2. Similarly, each end of the beam upper main reinforcement 10 and the beam lower main reinforcement 11 of the second beam 9 extends into the joining region J beyond the side wall surface 2b of the column 2 and is parallel to the side wall surface 2b of the column 2. , End at a position not exceeding an imaginary plane extending through the longitudinal central axis of the column 2. When the main reinforcements 6, 7, 10, 11 of the beams 5, 9 are terminated so as not to exceed the longitudinal central axis of the column 2 in this way, the main reinforcements 6, 7, 10 exceed the longitudinal central axis.
The concrete filling efficiency can be improved as compared to the case where 7, 10, 11 are extended.

At the end of each beam main reinforcement 6, 7, 10, 11
The longitudinal cross-sectional area of the end is increased so that each beam 5, 9 has two columns.
When a tensile force acts in a direction away from the nut, the supporting means for receiving the tensile force in the concrete cast in the joining area J, that is, the nut 1
3 are provided. The nut 13 is connected to the main beam 6,
When attached to the ends of 7, 10 and 11, when the tensile force acts on the beams 5 and 9, the concrete is sheared in the direction indicated by the broken line S in FIGS. Stress will occur. The joint structure 1 has a concrete reinforcing means for preventing the concrete from being broken by the bearing force of the nut 13, that is, a spiral hoop bar 14.

The spiral hoop 14 has a pillar 2 and a beam 5,
9 from above the joint region J or from above the top surface of the beams 5 and 9 to below the joint region J or below the bottom surface of the beams 5 and 9
It extends spirally along the longitudinal direction of the pillar 2, and is positioned so that the outer periphery of the spiral hoop muscle 14 is in contact with some of the pillar main muscles 3 of the pillar 2.

When joining the column 2 and the beams 5 and 9, the spiral hoop bar 14 is fixed to the column main bar 3 of the column 2 by a suitable means such as a wire, and then the column 2, the floor supporting the column 2 and Concrete is cast on beams 5 and 9.

The present invention is not limited to the above-described embodiment, but allows various modifications as described below.

For example, in the above embodiment, each end of the beam main reinforcing bars 6, 7, 10, 11 of the beams 5, 9 is configured to terminate at a position not exceeding the longitudinal central axis of the column 2. However, the column 2 may extend beyond the longitudinal central axis. In this case, from the viewpoint of concrete filling efficiency, the beam upper main bar 6 of the first beam 5 and the beam upper main bar 10 of the second beam 9 and the beam lower main bar 10 of the first beam 5 intersecting each other. It is preferable that the main reinforcement 7 and the main reinforcement 11 below the beam of the second beam 9 are spaced apart in the vertical direction.

Further, in the above embodiment, the spiral hoop bar 14 is only positioned so as to be in contact with some of the column main bars 3 of the column 2, and is only fixed to the column main bar 3 so as not to move during concrete casting. However, the spiral hoop bar 14 may be fixed to the column main bar 3 of the column 2 by, for example, welding.

Furthermore, in the above-described embodiment, the spiral hoop bar 14 is employed as the bearing means, that is, the concrete reinforcing means for preventing the concrete from being broken by the bearing pressure of the nut 13. It is sufficient if the member is arranged so as to suppress the destruction of the concrete due to the bearing pressure of the means. The concrete reinforcing means includes, for example, the first portion extending in parallel with the beam main reinforcements 6 and 7 and the beam main reinforcements 10 and 11 in the above embodiment.
A substantially L-shaped reinforcing bar consisting of a second part extending in parallel with the first part and a connecting part connecting the first part and the second part is spaced apart from above the top surfaces of the beams 5 and 9 to below the bottom surface. It may be one that is arranged by placing it.

Furthermore, in the above embodiment, the column 2 is a so-called cast-in-place concrete column, and the beams 5 and 9 are so-called cast-in-place concrete beams. So-called precast reinforced concrete columns and beams may be used.

Further, in the above embodiment, the present invention has been described by taking as an example a joint structure in which two reinforced concrete beams 5 and 9 are joined to one reinforced concrete column 2. It can be applied to join beams.

Further, in the above embodiment, the columns 2 and the beams 5 and 9 have been described as rectangular, but the columns and beams may have other shapes, for example, circular shapes. In the case of such a circular column, the end of the main bar of the beam is, in the above embodiment,
It terminates at a position that does not exceed the longitudinal center axis of the reinforced concrete column from the side wall surface of the reinforced concrete column through which it extends.

[0035]

As described above, the present invention can provide a joint structure between a reinforced concrete column and a reinforced concrete beam without reducing the space in which concrete is not filled and without displacing the main reinforcement of the beam.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a conventional joint structure between a reinforced concrete column and a reinforced concrete beam.

FIG. 2 is a schematic side view of the bonding structure of FIG.

FIG. 3 is a schematic plan view showing one embodiment of the joining structure of the present invention.

FIG. 4 is a schematic side view of the joint structure of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joining structure 2 Reinforced concrete column 3 Column main reinforcement 5, 9 Reinforced concrete beam 6, 10 Beam upper main reinforcement 7, 11 Beam lower main reinforcement 13 Bearing means (nut) 14 Concrete reinforcement means (spiral hoop reinforcement)

Claims (6)

[Claims] 1. A beam-column joint structure for joining one reinforced concrete column and two or more reinforced concrete beams, wherein the reinforced concrete column has a plurality of pillar main bars spaced apart, and each of the reinforced concrete beams is , At least two or more beam upper main bars spaced apart from each other,
At least two or more beam lower main bars arranged below the beam upper main bar, and in a joint area between the reinforced concrete column and the reinforced concrete beam, the beam upper main bar and the beam lower main bar of the reinforced concrete beam are provided. An end is arranged so as not to be in contact with the ends of the beam upper main bar and the beam lower main bar of another reinforced concrete beam, and the ends of the beam upper main bar and the beam lower main bar extending to the joining region are provided at the ends. Means for increasing the longitudinal sectional area of the reinforced concrete beam and receiving the tensile force in the concrete cast into the joint area when a tensile force acts on the reinforced concrete beam in a direction away from the reinforced concrete column. Is provided, and when the tensile force acts on the reinforced concrete beam, the joining is performed by the supporting means. A concrete reinforced column and a reinforced concrete beam, which are provided with concrete reinforcing means for preventing the concrete poured into the joining area from being destroyed by shear stress generated in the concrete poured into the area. Joining structure. 2. An end of each of the beam upper main bar and the beam lower main bar of each reinforced concrete beam terminates at a position not exceeding a longitudinal center axis of the reinforced concrete column from a side wall surface of the reinforced concrete column extending therethrough. The joining structure according to claim 1, wherein: 3. An end of each of the beam upper main bars and the beam lower main bars of each reinforced concrete beam does not cross each other in an up-down direction with ends of the beam upper main bars and the beam lower main bars of another reinforced concrete beam. The joining structure according to claim 1, wherein the joining structure is arranged. 4. The end of the upper beam main reinforcement and the lower beam main reinforcement of each reinforced concrete beam extends beyond a longitudinal center axis of the reinforced concrete column from a side wall surface of the reinforced concrete column extending therethrough, and The beam upper main bar and the beam lower main bar of the reinforced concrete beam vertically intersect the ends of the beam upper main bar and the beam lower main bar of the reinforced concrete beam of the reinforced concrete beam. The joint structure according to claim 1, wherein an upper main bar and an end of the beam lower main bar are vertically spaced apart from each other. 5. The supporting means according to claim 1, wherein said supporting means is a nut screwed into a male screw formed at an end of said beam upper main bar and said beam lower main bar of said reinforced concrete beam. The joining structure according to claim 4. 6. The concrete reinforcing means extends spirally along a longitudinal direction of the reinforced concrete column from above the joint region to below the joint region, and has an outer periphery in contact with the main bar of the reinforced concrete column. Characterized by being positioned spiral hoop muscles,
The joining structure according to claim 1.