JPH04130625U - Hollow steel reinforced precast concrete beam - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the weight of components, improve structural functionality, and save labor in construction. [Structure] A hollow steel reinforced concrete beam A is constituted, which includes a beam steel frame 1 with a sacrificial frame 2 stretched between the outer ends of upper and lower flanges, and a hollow portion 3 formed inside the beam.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a hollow steel frame used for girders, etc. in ultra-high-rise steel reinforced concrete construction. This relates to reinforced precast concrete beams.

0002

[Conventional technology]

Conventional SRC girders consist of H-beams built into reinforced concrete. Ru.

0003

[Problem that the idea aims to solve]

However, the center section of the beam center in the conventional SRC girder is The weight of the RC beam was unnecessarily increased. The present invention was proposed in view of the problems of the above-mentioned prior art, and its purpose is The key to this is to reduce the weight of components, improve structural functionality, and save labor in construction. Our goal is to provide hollow steel reinforced precast concrete beams that can be used.

0004

[Means to solve the problem]

In order to achieve the above object, the hollow steel reinforced precast concrete according to the present invention The beam consists of a built-in beam steel frame with a frame stretched between the outer ends of the upper and lower flanges. has been done.

[0005]

[Effect]

According to the present invention, when precasting an SRC beam, the upper and lower flanges of the beam steel frame By providing a waste form between the outer ends, a hollow space is formed inside the beam, reducing the weight of the beam. is planned. In addition, the hollow part is installed and integrated in the center of the beam, and is located outside the plastic region of the beam end. Because it is placed in the The bottom is also tiny.

[0006]

【Example】

The present invention will be described below with reference to the illustrated embodiments. A is a hollow steel precast concrete beam, and 1 is an H-shaped steel built into the beam A. A steel beam frame is used, and a waste frame 2 made of mesh, perforated steel plate, etc. is stretched between the outer ends of the upper and lower flanges. When converting an SRC beam into a PC using a beam steel frame 1 with a lump-sum frame 2, there is a cavity inside the beam. Part 3 is formed.

[0007] In the figure, 4 is the main reinforcement of the beam, 5 is the reinforcement, and 6 is the concrete. The beam A is connected to the column B via the steel joint 1a, and a semi-precast steel is installed on the beam A. After the concrete slab C is installed and the beam top reinforcements 7 and slab reinforcements 8 are placed, the slab concrete slab C is installed. REIT D is to be cast. In the figure, 6a is the end concrete. According to the illustrated embodiment, as described above, the beam steel frame 1 in the beam cross section is used to create a hollow By forming part 3, it is possible to reduce the weight of the building as a whole. Ru.

[0008] The hollow portion 3 is located at the center of the beam and is outside the plastic region at the end of the beam. Therefore, there is no effect on the structural strength, and there is only a slight decrease in the bending rigidity of the beam. . In addition, since the amount of beams increases in high-rise buildings, beam A with the hollow part is used. This significantly reduces weight, making it possible to design economically by reducing the weight of the structural frame. Becomes Noh. Furthermore, by reducing the weight of the beam A itself due to the hollow portion 3, it is easier to handle during transportation. Efficiency during construction will be improved.

[0009]

[Effect of the idea]

As mentioned above, the steel-framed reinforced concrete beam according to the present invention This is achieved by installing a waste form between the outer ends of the lower flange and forming a hollow part inside the beam. This will reduce the weight of the building, save labor in construction, and reduce the overall weight of the building. As a result, the cost of the structural frame can be reduced. In addition, the hollow part is placed in the center of the beam. By arranging it so that it is outside the plastic region of the beam end, it does not affect the structural strength. Moreover, the decrease in bending rigidity can be minimized.

[Brief explanation of drawings]

FIG. 1 is a side view illustrating a part of an embodiment of a hollow steel reinforced precast concrete beam according to the present invention;

FIG. 2 is a longitudinal sectional view of a frame using the beams.

FIG. 3 is an enlarged vertical cross-sectional view showing details of the beam and floor joint in FIG. 2;

[Explanation of symbols]

A Hollow steel reinforced concrete beam 1 Beam steel frame 2 Discard frame 3 Cavity 4 Main beam reinforcement 5 Rib muscles 6 Concrete

Claims (1)

[Scope of utility model registration request] 1. A hollow steel-reinforced precast concrete beam comprising a beam steel frame with a frame stretched between the outer ends of upper and lower flanges, and having a hollow portion formed inside the beam.