JPH0751816B2 - Beam unit and steel column / beam integrated unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application> The present invention relates to a beam unit and a steel column / beam integrated unit in which an SRC-made beam is improved and a steel frame column is pre-joined to form a unit. It is a thing.

<Conventional technology> Conventional SRC construction is used for all steel frames of columns, beams, floor slabs,
Reinforcing bars are assembled on site, then formwork is attached and concrete is placed, or PC beams and PC manufactured in factories, etc.
It was done by assembling the floor etc. on site.

Among them, as shown in FIG. 10, the main type of PC beams is a half-PC beam 1 in which an upper end portion of a stirrup 2 is projected on an upper surface (see, for example, Japanese Patent Publication No. 53-21204).

This half-PC beam 1 is manufactured by placing concrete so that both ends of the H-shaped beam steel frame 3, both ends of the lower end streak 4 and the upper end of the stirrup 2 are exposed.

Both ends of the beam steel frame 3 are used as joint plates with a steel column not shown, and both ends of the lower end bar 4 are connected (anchors).
It is used as a line for joining with the connection (anchor) line of another half-PC beam, and the upper end of the stirrup 2 is used as a connecting part with the floor slab 9 as shown in FIG.

That is, in FIG. 11, the beam upper end reinforcements 6 and floor slab reinforcements 7a are inserted into the upper end of the stirrup 2, and further floor slab reinforcements 7b and the like are appropriately arranged, and then a formwork (not shown) is attached to the concrete. Then, the floor slab 9 is constructed.

<Problems to be Solved by the Invention> In the case of the conventional semi-PC beam 1 as described above, the concrete poured in advance in a factory or the like and the concrete cast in the field are provided above the beam, which is extremely important in terms of structure. There was a problem that piecing would occur. In order to ensure the quality of this joint, use of high-quality and high-cost concrete, careful concrete placement work to prevent the occurrence of voids, use of many high-strength and high-cost reinforcing bars, etc. Was forced to.

Moreover, complicated work such as insertion of the beam upper end reinforcement 6, binding, and joining with the steel column is left on site, which is one of the causes of prolonging the construction period.

Further, in the case of the conventional semi-PC beam 1, the floor slab 9 can be constructed only from the upper surface of the PC beam, and the lower part of the beam projects to the ceiling surface.
For this reason, the conventional half-PC beam 1 should be used in places where the projection of the beam from the ceiling surface is an obstacle from the viewpoint of appearance and equipment, such as the exterior walls of buildings, stair rooms, and computer rooms. I couldn't do it, and on the site exclusively, by assembling beam steel frames, various reinforcements of beams and floor slabs, attaching formwork, placing concrete, etc.
It was necessary to carry out the so-called reverse beam construction in which the floor slab is placed under the beam.

INDUSTRIAL APPLICABILITY The present invention does not have a splice on the upper part of the beam, does not require complicated work such as joining with a steel column in the field, and can be applied to the reverse beam method and a steel column / beam integrated unit. The purpose is to provide.

<Means for Solving the Problems> In order to achieve the above-mentioned object, a first aspect of the present invention is that a beam unit includes a beam steel frame and a connecting end portion of a beam reinforcing bar projecting from an end portion in the longitudinal direction, and a beam unit on a lateral side portion. It is characterized in that the floor slab joint is projected and the whole is made of precast concrete beams.

A second aspect of the present invention is a concrete beam in which a beam steel frame and a connecting end portion of a beam reinforcing bar are projected at an end portion in a longitudinal direction and a floor slab connecting portion is projecting at a side portion in a width direction, so that the entire precast concrete beam is formed. And a steel frame pillar integrally joined to the connection end of the beam steel frame of the concrete beam.

<Operation> To describe the operation of the first invention, since it is a precast concrete beam as a whole, there is no joint at the upper part of the beam, and the structural yield strength of the beam is improved. For this reason,
The use of high-quality, high-cost concrete, which was conventionally indispensable for ensuring the quality of beams, concrete pouring work without voids, and the use of many high-strength, high-cost reinforcing bars, etc. are required. In addition, material costs and construction costs can be significantly reduced. In addition, the formwork for pouring concrete on site, which was necessary for conventional half-PC beams, is no longer necessary, and cost reduction can be achieved in this respect as well. Then, the work at the site can be simplified and reduced, and the construction period can be greatly shortened.

And while precasting the whole in this way, since the connecting ends of the beam steel and beam reinforcing bars and the floor slab joint are projected and secured, it is also possible to join the surrounding columns and beams / slabs on site. It can be done easily.

Particularly, since the height of the protruding position of the floor slab connecting portion can be set as required, it is possible to support both the normal beam method and the reverse beam method. Therefore, the reverse beam method can also be precast and the construction of the outer wall of the building, the staircase, the computer room, etc. can be performed easily.

The operation of the second invention will be described. In addition to the same operation as that of the first invention, the steel column is also joined in advance, so that the site work can be further reduced.

<Embodiment> FIG. 1 is a perspective view showing an embodiment of the beam unit.

The first aspect of the invention is basically that the beam unit 10 is such that the connecting ends of the beam steel frame 3 and the beam reinforcing bars 4 and 6 project at the longitudinal ends and the floor slab joints 11 and 12 at the lateral sides. Is formed so as to project, and the whole is made up of precast concrete beams 5.

In the figure, 10 is a beam unit, concrete is poured in, leaving both end portions 3a of the H-beam steel frame 3 and both end portions 6a, 4a of the upper end bar 6 and the lower end bar 4, and in this embodiment, Floor slab connecting portions 11 and 12 are provided on the lower part of one side surface of the beam 5 in a manner shown in FIGS. 2 and 3, for example.

First, as shown in FIG. 2, the floor slab fitting portion 11 fits the L-shaped metal fitting between the upper and lower flanges of the H-shaped beam steel frame 3,
The tip of the horizontal portion of the shaped metal article is configured to project from the lower portion of the side surface of the beam 5. A bolt hole 11a is formed at the end of the horizontal portion of the L-shaped metal object protruding from the beam 5.

Although not shown, the L-shaped metal and the H-shaped beam steel frame 3 may be fixed to each other by bolts / nuts or welding.

Next, as shown in FIG. 3, the floor slab joining portion 12 includes an L-shaped reinforcing bar 12a and a linear reinforcing bar 12b, in which the tip of the L-shaped reinforcing bar 12a is straight from the center of the side surface of the beam 5 to a slightly lower part. The tips of the bar-shaped reinforcing bars 12b are configured to protrude below the side surfaces of the beam 5, respectively.

Also in this case, although not shown, the L-shaped reinforcing bar 12a, the linear reinforcing bar 12b and the H-shaped beam steel frame 3 may be fixed by bolts, nuts or welding.

The beam unit 10 shown in FIGS. 1 to 3 is shown in FIGS.
As shown in the figure, the so-called reverse beam method is used in which the floor slab 9 is installed on the lower part of the beam 5, but the floor slab joints 11 and 12 are attached to the side surface of the beam 5 as shown in FIGS. 4 and 5. It is also possible to adopt a normal beam system in which the floor slab 9 is installed above the beam 5 by projecting it on the upper part.

In addition, in FIGS. 1 to 5, the floor slab connecting portions 11 and 12 are shown.
Can also be provided on both sides of the beam 5.

6 and 7 are perspective views showing construction of the beam unit 10.

In the illustrated example, the beam steel frame end portion 3a of the beam unit 10 shown in FIG.
Are joined to the steel column 20.

Then, the end portions 4a, 6a of the beam reinforcing bars 4, 6 projecting at the longitudinal ends of the beam 5 are joined to the beam reinforcing bars 4, 6 of another beam unit 10 having the same structure, and the beam steel frame 3 End 3a of steel column 2
Joined with 0. The beam units 10 are joined to each other at their ends 4a and 6a, and the beam units 1
By joining 0 to the steel column 20, construction work will be carried out on site. Then, during floor construction, the floor slab joints 11 and 12 are joined to the reinforcement of the floor slab 9,
Be united. At this time, if the floor slab connecting portions 11 and 12 are provided on the upper portion of the beam 5, the floor slab 9 is constructed above the beam 5, and if it is provided on the lower portion, the floor slab 9 is lowered. A floor slab 9 is installed on the floor. The so-called reverse beam method is used. Further, as shown in FIG. 7, reinforcements 21 and concrete are placed on the steel columns 20.

FIG. 8 is a perspective view showing an embodiment of the steel frame pillar / beam integrated unit according to the second invention.

The second invention is basically such that the beam steel frame 3 and the connecting end portions 3a, 4a, 6a of the beam reinforcing bars 4, 6 are projected at the longitudinal end portions and the floor slab joint portion 11, at the lateral side portions, 12 is projected, and is made up of a precast concrete beam 5 as a whole, and a steel frame column 20 integrally joined to the connecting end 3a of the beam steel frame 3 of the concrete beam 5.

In the illustrated example, four beam units 10 shown in FIG.
It is configured as a unit which is joined and integrated to both upper and lower portions of the steel column 20 of the book via the beam steel frame end portions 3a of the beam unit 10.

In FIG. 9, three beam units 10 shown in FIG. 1 are used,
A steel column 20 is formed between the beam units 10 as a unit that is joined and integrated through the beam steel end portions 3a.

Although the beam units 10 at both ends are shorter than the central beam unit 10 in FIG. 9, it goes without saying that all three beam units 10 may have the same length.

In this embodiment, the end portion of the beam steel frame 3 of the beam unit 10 described above is
The structure is made by pre-joining the steel columns 20 to the 3a, and at the time of construction work at the site, the steel columns 20 of a plurality of steel column / beam integrated units are joined together and the beam rebars 4, 6 are also joined together. After that, the floor slab 9 is constructed in the same manner as in the above embodiment.

In the above embodiment, for the joining and unifying of the steel beam end portion 3a of the beam and the steel column 20, the usual joining and unifying method such as welding, bolts and nuts can be directly adopted.

<Effects of the Invention> In the present invention described in detail above, the following effects can be achieved.

(1) Since the whole is a precast concrete beam, there is no splice at the top of the beam, and the structural strength of the beam is improved. For this reason, the use of high-quality, high-cost concrete, which was previously indispensable for ensuring the quality of the beams, concrete pouring work without voids, or the use of a large number of high-strength, high-cost reinforcing bars, It is not required, and material costs and construction costs can be reduced significantly.

(2) Formwork, which was necessary for conventional semi-PC beams, when pouring concrete on site is not required, and cost can be reduced in this respect as well.

(3) Work on the site can be simplified and reduced, and the construction period can be shortened significantly.

(4) And, while precasting the whole in this way, since the connecting ends of the beam steel frames and beam reinforcing bars and the floor slab joints are projected and secured, it is possible to use the surrounding columns, beams and slabs on site. Can be easily joined.

(5) Since the height position of the floor slab connecting portion projecting on the side portion in the width direction of the beam can be set as necessary, it can be applied to either a normal beam system or a reverse beam system. Therefore, the reverse beam method can also be precast and the construction of the outer wall of the building, the staircase, the computer room, etc. can be performed easily.

(6) By constructing the steel frame columns in advance, it is possible to further reduce on-site work.

[Brief description of drawings]

FIG. 1 is a perspective view showing a preferred embodiment of the first invention, FIGS. 2 and 3 are enlarged cross-sectional views of an essential part of FIG. 1, and FIGS. 4 and 5 are floor slab joints. FIG. 6 is a perspective view showing a joint with a steel column, FIG. 7 is a diagram showing a construction mode at the site where the steel column portion is reinforced, and FIG. 2 is a perspective view showing a preferred embodiment of the invention of FIG. 2, FIG. 9 is a perspective view showing another embodiment, FIG. 10 is a perspective view showing a conventional half-PC beam, and FIG. 11 is a half shown in FIG. It is a figure which shows the floor slab construction aspect to a PC beam. 3 …… Beam steel 4,6 …… Beam reinforcement (beam top reinforcement, beam bottom reinforcement) 5 …… Concrete beam 10 …… Beam unit 11, 12 …… Floor slab joint 20 …… Steel column

Claims (2)

[Claims] 1. A concrete beam precast as a whole, in which a beam steel frame and a connecting end of a beam reinforcing bar are projected at longitudinal ends and a floor slab joint is projected at lateral sides. A beam unit characterized by that. 2. A concrete beam precast as a whole, in which a connecting end portion of a beam steel frame and a beam reinforcing bar is projected at a longitudinal end portion and a floor slab connecting portion is projectingly provided at a lateral side portion, An integrated unit of steel frame and beam, comprising a steel frame column integrally joined to a connection end portion of a beam steel frame of the concrete beam.