JPH07139089A - Large structure of RC structure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an RC structure large beam that enables labor saving in construction. [Structure] A high-strength reinforcing bar is arranged as the main bars 4,5 of the large beam 1 and the connection beam 3, and among the main bars 4 and 5 composed of the high-strength reinforcing bar, the main bar 4 arranged on the pulling side is 5 and 10 are tensioned to introduce prestress to the large beam 1 and the connection beam 3, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large flash having an RC structure in which a main bar is arranged at least on the pulling side and a shear reinforcing bar is arranged around the main bar.

[0002]

2. Description of the Related Art In recent years,
Buildings with large spans have been actively built, and along with this, large spans are possible as large RC structures.
So-called prestressed concrete beams (hereinafter "PS
"Beam" is widely used.

Conventionally, this type of PS beam is constructed by embedding a high-strength steel wire in the concrete of the beam, separately from the main beam of the beam, and tensioning this to introduce prestress to the beam.

The conventional PS beam is constructed as described above, and in order to introduce prestress to the beam, a high-strength steel wire is buried in addition to the main beam of the beam. In the anchorage section, the high-strength steel wire and the main beam of the beam were intricately complicated, and the installation was complicated, and there were problems such as difficult construction.

The present invention has been made to solve the above problems, and an object thereof is to provide a large flash of an RC structure which enables labor saving in construction.

[0006]

The RC burrs according to the present invention have a high-strength reinforcing bar as a main bar of the RC burrs,
In addition, of the main reinforcements made of high-strength reinforcement, the main reinforcement arranged on the pulling side is tensioned to introduce prestress.

[0007]

【Example】

Example 1. 1 to 4 show an embodiment of a large beam of an RC structure according to the present invention. In the drawings, reference numeral 1 is a large beam of an RC structure according to the present invention, and 2 is formed at both ends of the large beam 1. The RC structure pillars 3 and 3 are projected from the joint portion of the pillar 2, and the RC structure joint beams 4 and 5 which join the large beam 1 are placed in the concrete of the large beam 1 and the joint beam 3. The main bars arranged on the pulling side and the compression side respectively, 6 is a fixing metal fitting for fixing the ends of the main bars 4 and 5, 7 is a fitting for joining the main bars 4 and 5, and reference numeral 8 is Shear reinforcement bars arranged around the main bars 4 and 5.

The large burrs 1 and the joint burrs 3 are made of completely cast-in-place concrete, or as shown in FIG.
As shown in (b), it is composed of a large beam composed of partially precast concrete, and high-strength deformed screw bars are used for main bars 4 and 5, and the main bars 4 and 5 are The main bars 4 and 5 arranged on the side, that is, the main bar 4 on the lower end side in the barr 1 (see FIG.
In the solid bar 4)), and in the connection beam 3, the main bar 5 on the upper end side (the main bar 5 shown in the solid line in FIG. 1) is introduced by tensioning force, respectively. A predetermined amount of prestress has been introduced into the mouth lip 3.

In this case, with respect to the external force acting on the large beam 1 and the connection beam 3, the tensile force of the main bars 4 and 5 and the large beam 1
It is designed so as to resist with the prestress introduced into the connection beam 3, and the proportion to be shared is appropriately determined in consideration of the scale of the building and the construction conditions. Therefore, in some cases, all of the pulling side main muscles 4 and 5 may be strained,
In some cases, it may be sufficient to strain some of them.

When a large beam made of precast concrete as shown in FIGS. 3 (a) and 3 (b) is used, the parts other than the precast portion are made of cast-in-place concrete.

In order to introduce the prestress to the large flash 1 and the connection flash 3, any of a pretension method and a posttension method which are generally used in the past can be used. Further, in the case of the post tension system, a so-called filling type screw fixing metal fitting is used as the fixing metal fitting 6 for fixing the ends of the main bars 4 and 5, and if necessary, the sheath 9 is covered over the entire length of the main bars 4 and 5. The sheath 9 is filled with a grout material 10 such as mortar in order to integrate the main bars 4 and 5 with the large flash (see FIG. 2).

The fixing member 6 may be a conventional nut / fixing plate type, but management such as loosening prevention is required.

[0013]

The present invention is constructed as described above, and a high-strength reinforcing bar is used for the main bar arranged in the concrete of a large flash, and the main bar is prestressed by tensioning the main bar. Since P has been introduced,
The high-strength steel wire required for the S-beam can be omitted, so that the main bar and the high-strength steel wire are not mixed in at the anchoring part of the main bar, etc., resulting in significant labor saving in construction. There is.

Further, by combining the main bar of the large beam with the high-strength steel wire for introducing prestress into the beam, the main bar and beam cross section can be reduced, and the material cost can be reduced. There is an effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a partial side view of an RC frame showing an example of a large beam of an RC structure according to the present invention.

FIG. 2 is an enlarged view of part A in FIG.

3 (a) and 3 (b) are sectional views taken along the line aa in FIG.

FIG. 4A is a vertical cross-sectional view of a fixing unit showing a mounting state of a filling type screw fixing metal fitting, and FIG. 4B is a side view of FIG. 4A.

[Explanation of symbols]

1 ... Large bar, 2 ... Pillar, 3 ... Ball, 4,5 ... Main line, 6 ...
Fixing metal fittings, 7 fitting fittings, 8 shear reinforcement bars, 9 sheath, 10 grout material.

Claims (1)

[Claims] 1. A main bar is arranged on at least the pulling side,
And, in a large beam of RC structure constituted by arranging shear reinforcing bars around this main bar, a high-strength reinforcing bar is arranged as the main bar, and the high-strength reinforcing bar is tensioned to introduce prestress. A large bar of RC structure characterized by being formed.