JP2003268876A - Support structure for faulting beam on concrete column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support structure for a faulting beam which supports a plurality of precast concrete beams 2, 3 on a concrete column 1 with a vertical step formed between the beams, wherein the structure is easy to construct and has sufficient bearing strength and stability for bearing the concrete beams. <P>SOLUTION: According to the structure, a raised portion 14 is formed on part of a top face 11a of a column main body 11 of the concrete column 1. The raised portion 14 includes column main bars 12A protruding from the top face 11a and tie hoops 15 welded to the main bars, and the main bars and the tie hoops are embedded in the precast concrete. Then, the precast concrete beam 3 at a relatively high location is borne on an upper surface of the raised portion 14 and the precast concrete beam 2 at a relatively low location is borne by the top face 11a of the column main body 11. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a rigid frame structure or the like in a reinforced concrete building, in which a plurality of precast concrete beams are connected to a concrete column made of reinforced concrete or precast concrete. The present invention relates to a beam support structure for joining with a step (a height difference). 2. Description of the Related Art As a construction technique of a ramen frame or the like in a reinforced concrete building, a construction method using a precast concrete member produced in a factory in advance is known.
3 and 4 are longitudinal sectional views showing a conventional step beam support structure for joining a plurality of precast concrete beams to a column cap of a concrete column with a step (height difference) in the construction of a reinforced concrete building. is there. [0003] First, in the conventional step beam support structure shown in FIG. 3, a lower precast concrete girder 1 is attached to a top end face 101 a of a reinforced concrete column 101.
04 is supported at a position outside the main bar 102 and the hoop bar 103 projecting from the top end surface 101a of the stigma,
End 1 of precast concrete girder 105 on the high side
05a is a top end surface 101 of the capital, via a support fitting 106 fixed to one side surface 101b of the capital with a bolt 106a or the like.
It is supported in a state of floating from a. [0004] In the conventional step beam support structure shown in FIG. 4, an end 104 a of a lower precast concrete girder 104 is attached to a top end face 101 a of a reinforced concrete pillar 101 by a main bar 102 and a hoop bar 10.
3 and the end 105a of the precast concrete girder 105 on the higher side is connected to the top end face 101a of the capital by a concrete member 107 located outside the main bar 102 and the hoop bar 103. , And is supported in a state of floating from the top end surface 101a of the capital. [0005] However, in the above-mentioned conventional technique, according to the stepped beam support structure shown in FIG.
Precast concrete girder 105 on support bracket 106
There is a problem in the stability when placing the end 105a, and the time required for positioning the support bracket 106 at a predetermined height, attaching it to the one side surface 101b of the capital with a bolt 106a, and removing it after construction is reduced. Cost was high.
Further, according to the step beam support structure shown in FIG. 4, the concrete member 107 supporting the end portion 105a of the precast concrete girder 105 has to be installed outside the main bar 102 and the hoop bar 103. However, it was not possible to obtain a sufficient thickness in the horizontal direction, so that not only was it difficult to manufacture the concrete member 107, but also there was a problem in the strength of supporting the weight of the precast concrete girder 105. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a technical problem of the present invention is to provide a step beam support which is easy to construct and which can obtain sufficient supporting strength and stability for concrete beams. It is to provide a structure. [0007] The conventional technical problems can be effectively solved by the present invention. That is, the step support structure for concrete pillars according to the present invention forms a rising part in which a part of a reinforcing bar projecting from the top end face is buried in a part of the top end face of the pillar main body in the concrete pillar, and relatively. The precast concrete beam on the higher side is supported on the upper surface of the rising portion, and the precast concrete beam on the lower side is supported on the top end surface of the column body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a step support structure for a concrete pillar according to the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a longitudinal sectional view showing a step supporting structure of a concrete pillar according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 1 and 2, reference numeral 1 is a precast concrete column, and reference numerals 2 and 3 are precast concrete girders. The precast concrete girders 2 and 3 have a predetermined step h (height difference)
It is joined to the capital of the precast concrete column 1. In addition, in the figure, the precast concrete girders 2 and 3 are shown by two-dot chain lines . The main body (hereinafter referred to as the column main body) 11 of the precast concrete column 1 has a square or rectangular cross section orthogonal to the longitudinal direction (horizontal cross section) and has a predetermined depth from the outer surface of the column main body 11. At the position, a large number of pillar main reinforcements 12 extending in the longitudinal direction (vertical direction) of the column at predetermined horizontal intervals, and a large number of welded rods arranged at predetermined intervals in the longitudinal direction (vertical direction) of the column main reinforcements 12 so as to surround them. Hoops 13 are embedded. A part of the pillar main bar 12 protrudes from the top end surface 11a of the pillar cap of the pillar body 11, and extends to a required height. On the top end surface 11a of the column head of the column main body 11, a rising portion 14 whose outer surface 14a forms a continuous surface with one side surface 11b of the column main body 11 corresponds to the height difference between the precast concrete girders 2 and 3. At a height h. The rising portion 14 is made of concrete continuous with the pillar main body 11, and has a horizontal cross section having a rectangular shape as shown in FIG. A large number of pillar main bars 12 embedded in a pillar body 11
Among them, some pillar main bars 12A extending in the longitudinal direction near one side surface 11b of the pillar body 11 project upward from the pillar body 11 through the rising portions 14. That is, in other words, the rising portion 14 is formed so as to straddle the inside and outside of the bar arrangement position of the column main bar 12A. In addition, the rising portion 14 has a plurality of strips 15 extending substantially horizontally.
Are buried at predetermined intervals in the vertical direction, and
A is connected by means such as welding or binding,
Both ends 15a and 15b project from the rising portion 14 with an appropriate length. The precast concrete column 1 having such a structure is preliminarily arranged in a factory at a factory in a predetermined formwork device, after reinforcing bars such as column main bars 12, 12A, hoop bars 13, band bars 15, and the like. And cured. The rising portion 14 of the precast concrete column 1 is formed integrally with the column body 11 by the inner shape of the end of the formwork device. The pillar main body 11 is manufactured to have a hollow shape by using a hollow frame or the like inserted inside the pillar main reinforcement 12 and the hoop reinforcement 13 in order to reduce the weight for the purpose of facilitating transportation and assembly. Can be. On the other hand, precast concrete girders 2,
Similarly, 3 is also manufactured in advance in a factory using a predetermined formwork device, and its cross section (vertical cross section) orthogonal to the longitudinal direction has a square or rectangular shape, and a number of beams (not shown). The main reinforcement and a large number of hoop reinforcements surrounding the main reinforcement are buried, and the ends of the beam main reinforcement project from the ends of the precast concrete girders 2 and 3 (not shown).
Further, in order to reduce the weight for the purpose of facilitating transportation and assembling, the precast concrete girders 2 and 3 can be formed into a hollow shape or a gutter shape by using a hollow formwork or the like. These precast concrete columns 1 and precast concrete girders 2 and 3 are manufactured after the factory production.
It is transported to the site and assembled, and the column / beam joints are integrally joined and framed by reinforcing bars and casting concrete at the site. Further, as described above, in the present embodiment, the precast concrete girders 2 and 3 are joined to the capital of the precast concrete column 1 with a predetermined height difference h. That is, first, the precast concrete column 1 is built vertically, and at this time, the outer surface 14a of the rising portion 14 is positioned and built so as to face the erection direction of the precast concrete girder 3 on the higher position. Next, the pillar main bar 12 protruding from the top end surface 11a of the pillar body 11
And the column main bar 1 protruding from the top end surface 14b of the rising portion 14
A hoop 16 for post-cast concrete of the column / beam joint is arranged so as to surround 2A as shown by a dashed line in the figure. Weld with 15a, 15b. Next, between the capital of the precast concrete column 1 and the capital of another precast concrete column (not shown), the precast concrete girders 2,
3 is installed. At this time, the lower surface of the end of the lower precast concrete girder 2 is placed on the top end surface 11a of the column body 11 of the precast concrete column 1.
The columnar main bar 12 protruding from a and the hoop bar 16 surrounding the column main bar 12 are supported and supported. On the other hand, the lower surface of the end portion of the precast concrete girder 3 on the high side is located on the top end surface 14b of the rising portion 14 of the precast concrete column 1 and outside the column main bar 12A protruding from the top end surface 14b and the hoop bar 16 surrounding it. Positioned and supported. [0018] Precast concrete girders 3 on the high side
As described above, the rising portion 14 for supporting the precast concrete beam 1 is formed at the same time when the precast concrete column 1 is manufactured, so that the precast concrete girder 3 rises from the top end surface 11a of the column body 11 as in the related art. It is not necessary to attach a metal fitting or a concrete member for supporting in a state where the work has been performed, so that the construction can be performed quickly. Moreover, the rising portion 14 is provided with the column main reinforcement 12.
A is formed so as to straddle the outside and inside of the reinforcement arrangement position of A, so that its horizontal cross-sectional area is large, and since it is a structure reinforced by the column main reinforcement 12A and the band reinforcement 15, the precast concrete The girder 3 can be stably supported, and sufficient supporting strength can be given. Next, the precast concrete girders 2,
3, column main bars 12 and 12A protruding from the precast concrete column 1, and band bars 1.
5. The hoop studs 16 and the like to be retrofitted are joined by means of welding or binding to form a column-beam joint formwork (not shown).
The precast concrete column 1 and the precast concrete girders 2 and 3 are joined. When the precast concrete column 1 is hollow or the precast concrete girders 2 and 3 have a gutter-like half precast structure, post-cast concrete is also cast into those hollow portions. In the above embodiment, the present invention is applied to a precast concrete column. However, a concrete column made by cast-in-place concrete (RC) is also used as a concrete column as shown in FIGS. The present invention can be practiced by forming it into a simple shape. Further, in the above-described embodiment, the rising portion 14 is provided only at one place. However, depending on the number of erected precast concrete girders 3 on the high side, for example, as shown in FIG.
As shown by a broken line, there may be two or more locations (two or more directions). According to the structure for supporting a stepped beam of a concrete column according to the first aspect of the present invention, an upright portion for supporting a plurality of concrete beams with a height difference from each other is provided at the capital of the concrete column. Unlike the related art, there is no need to attach a support member on site, and the construction can be performed quickly. In addition, since the rising portion has a large horizontal cross-sectional area and is reinforced by a reinforcing bar, it is possible to stably support the precast concrete beam with sufficient supporting strength.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional view showing a step support structure for a concrete pillar according to the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a longitudinal sectional view showing a step support structure for a concrete pillar according to the related art. FIG. 4 is a vertical sectional view showing a step support structure of a concrete pillar according to another related art. [Description of Signs] 1 Precast concrete column 11 Column main body 11a Top end surface 12, 12A Column main reinforcing bar (reinforcing bar) 13 Hoop bar 14 Rising section 15 Band bar 2, 3 Precast concrete beam (precast concrete beam)

Claims (1)

Claims: 1. A rising part in which a part of a reinforcing bar projecting from a top end surface is formed in a part of a top end surface of a pillar main body of a concrete pillar, and a relatively high side is formed. A step support structure for a concrete column, wherein a precast concrete beam is supported on an upper surface of the rising portion, and a relatively lower precast concrete beam is supported on a top end surface of the column body.