JP2946359B2 - Semi-precast concrete composite girder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite beam made of semi-precast concrete.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional semi-precast concrete composite girder spans a semi-precast girder member c having a built-in main beam a and a rib b between columns d. A method in which concrete reinforcement is reinforced and then concrete is cast and integrated, as shown in FIG. 8, the member c is extended to the left and right across the column d, and the beam main reinforcement a is joined at the position e between the columns. Concrete is cast and integrated.

[0003]

In the former case, since the main bars at the ends of the right and left beams are fixed at the beam-column joint, the number of main bars arranged to secure the main bar interval is limited. Also, since the main bars from both the X and Y directions intersect, it is difficult to arrange the bars in two steps, and the number of main bars in the arrow is limited.

[0004] In the latter case, the restriction on the number of main bars is relaxed more than in the former case, but it is still impossible to arrange two-stage bars.
In addition, the main beams of the beams must be mechanically or welded to each other at the central portion between the beams. Therefore, after the main reinforcing bars have been joined at the same joint, a formwork must be placed and concrete cast. The present invention has been proposed in view of the problems of the prior art, the object is to reduce the weight of the member and enable multi-stage reinforcement,
It is an object of the present invention to provide a semi-precast concrete composite girder which increases the degree of freedom of design, forms a frame at the joint between the girder members, and rationalizes the reinforcement work.

[0005]

In order to achieve the above-mentioned object, a semi-precast concrete composite girder according to the present invention comprises a U-shaped concrete beam member with a built-in beam main reinforcing bar and a rib reinforcing member at the capital portion. , Only the concrete part is divided, and the beam reinforcement of both concrete parts adjacent to each other across the same division part are connected across the same division part, and the beam reinforcement is continuous over the entire length of the U-shaped concrete beam member. It is the one that is arranged.

According to a second aspect of the present invention, at the joint between the adjacent U-shaped cross-section beam members, the main reinforcement of each of the beam members is not separately joined, but is separately provided between the insides of the respective beam members. Are arranged.

[0007]

The semi-precast concrete composite girder according to the present invention is constructed as described above. Therefore, the opposite ends of the composite girder sandwiching the divided portion of the concrete portion are mounted on the column cap, and are mounted on the girder. In the same manner, the orthogonal girder is also mounted on the column capital, and if necessary, the main reinforcement is arranged over the U-shaped cross-sectional lumen of the girder and the column-beam joint space, and the U-shaped cross-section of each of the girder is provided. Concrete is cast over the beam-column joint space between the cavity and the column capital.

Also, at the center of the span, without reinforcing the beam reinforcements of the adjacent U-shaped concrete sections, the beam reinforcements at the center between the beams are arranged along the inner cavity of the concrete sections, and concrete is laid. The concrete parts are cast and joined at the center of the span.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. A is a precast concrete girder having a U-shaped cross section. A main beam 2 and a rib 3 are built in a concrete beam member 1 having a U-shaped cross section. In the beam member 1, only a concrete portion is divided at a beam-column joint. The main beams 2 of the concrete portions adjacent to each other with the same split portion therebetween are connected across the same split portion, and the main beams of the beam are arranged over the entire length of the precast concrete girder having a U-shaped cross section. . The temporary main bar 2 'is connected as needed.

[0010] Opposite ends of the two adjacent concrete portions sandwiching the divided portion of the precast concrete girders A constructed as described above are mounted on the column caps of the columns B, and the other end orthogonal to the girders A. In the same manner, the girder A 'is mounted on the column capital, and if necessary, the main reinforcing bar 4 is arranged in multiple stages across the lumen of the opposing concrete portion and the column-beam joint in the respective girder A, A', After the installation of the slab and the completion of the reinforcing bars, each of the girders A, A '
Concrete is poured over the U-shaped cross section of the lumen and the beam-column joint. (Refer to FIG. 1 to FIG. 3) In the figure, 3 ′ is the main reinforcement 4
The ribs arranged between them.

FIG. 4 to FIG. 6 show joints between U-shaped cross-section beam members at the center of the span with a beam length of 2 spans. A main reinforcing bar 5 is separately provided between the inner cavities of the concrete beam member 1 having a cross section, and after the mounting of the floor slab and the reinforcing bars are completed, concrete is poured in the same manner as described above.

[0012]

As described above, according to the present invention, only the concrete portion is divided at the capital portion of a U-shaped concrete section member having a built-in beam main bar and a rib bar constituting the main part of the girder, and the concrete portion is sandwiched. The beam main reinforcement of both adjacent concrete sections is joined across the same divided section, and the beam main reinforcement is continuously arranged over the entire length of the U-shaped concrete beam member. In the XY directions, multi-step reinforcement is possible with the beam main reinforcement in the X and Y directions, and
Since it is formed in a V-shaped cross section, weight reduction is achieved.

According to a second aspect of the present invention, the main beam reinforcement at the center between the beams is U-shaped.
By arranging the reinforcing bars in the U-shaped cross section, it is not necessary to join the reinforcing bars incorporated in each beam member, and therefore, it is not necessary to perform the formwork and the reinforcing bars at the joining portions.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an installed state of a semi-precast concrete composite girder according to the present invention.

FIG. 2 is a side view showing a joint of the girders.

FIG. 3 is a view taken along arrows in FIG. 2;

FIG. 4 is a plan view showing a beam-to-beam joint of the girder.

FIG. 5 is a vertical sectional side view of FIG. 4;

FIG. 6 is a roll view of FIG. 4;

FIG. 7 is a side view showing an example of a conventional structure.

FIG. 8 is a side view showing another example of the conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete beam member 2 Beam main bar 3 Rib bar 4 Main bar 5 Main bar A Precast concrete girder B Column

Claims (2)

(57) [Claims] 1. A concrete portion is divided at a capital portion of a U-shaped concrete beam member having a built-in beam reinforcement and a rib reinforcement, and beam reinforcements of two concrete portions adjacent to each other with the same division portion interposed therebetween. A composite beam made of semi-precast concrete, wherein the beam is connected across struts and the main bar of the beam is continuously arranged over the entire length of the U-shaped concrete beam member. 2. At a joint portion between adjacent U-shaped beam members, without joining beam main reinforcement of each beam member,
The composite girder made of semi-precast concrete according to claim 1, wherein a main reinforcing bar is separately provided between the insides of the respective beam members.