JPS6320722Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for fixedly attaching the main reinforcing bars of a beam to the main reinforcing bars of a column in a reinforced concrete column/beam joint.

A very recent structure of this type is disclosed in Japanese Patent Publication No. 56-20413.
This means that the main reinforcement of a beam consisting of threaded reinforcement is
It is of a structure in which a pair of nuts are installed to penetrate the cross-shaped joints of the column and beam, and are inserted into the main reinforcing bars of the beam and tightened from the outside against the hoop bars surrounding the main reinforcing bars of the column. Ta. With such a structure, if the column has a rectangular cross section, there is no problem because the hoop muscle that the nut comes into contact with is also rectangular, but in the case of a column with a circular cross section, a circular spiral hoop is used, so there is no problem. A strong fixation state due to close contact with the nut on the circular arc-shaped outer periphery of the hoop cannot be expected at all.

On the other hand, compared to columns with a rectangular cross section, reinforced concrete columns with a circular cross section have great advantages in terms of cost reduction as they can use circular spiral hoops, which are extremely inexpensive, and the restraining force of the hoops on the concrete around the column. Recently, reinforced concrete columns with a circular cross section have been increasingly used in high-rise buildings because they can be made into large, uniform structures with extremely high toughness, and are advantageous in terms of space and aesthetics.

The present invention has been developed in view of the above circumstances, and its purpose is to strengthen the main reinforcing bars of reinforced concrete beams firmly against the main reinforcing bars, even when the target is a reinforced concrete column with a circular cross section. The purpose of the present invention is to provide a structure that can be connected and fixed, and is extremely simple and easy to assemble.

In order to achieve the above object, the fixing structure of the main reinforcing bars of a reinforced concrete beam to the main reinforcing bars of a reinforced concrete column according to the present invention surrounds the outer periphery of the main reinforcing bars of a reinforced concrete column arranged in a circular shape with an outer belt-shaped ring hoop, abutting the inner circumference of the main reinforcing bar of the column with the inner circumference of the inner circumference of the main reinforcing bar of the column in a state where it faces the outer circumference of the outer circumference;
An inner frame body whose outer surface is formed into an arcuate convex surface as a whole so that it can be brought into close contact with the inner circumferential surface of the inner ring hoop, and whose inner surface is flat is attached to the inner frame of the ring hoop. A through bar is provided in the outer band-shaped ring hoop, and is connected to the main reinforcing bar of the reinforced concrete beam in a state that abuts against the inner circumferential surface and passes through all of the inner and outer ring hoops and the inner frame, and A cylindrical member having a flat outer end surface is integrally fixed to each of the penetration points of the through-line, and is screwed onto the through-line from the outside of the cylindrical member and from the inside of the inner frame. It is characterized by being tightened and fixed by a pair of inner and outer nuts.

The above characteristic configuration provides the following excellent effects. In other words, in reinforcing steel work, (a) instead of tightening the inner and outer nuts by directly contacting them with the arcuate surfaces of the inner and outer ring hoops, a plane should be provided between them that matches the contact plane of the nuts. Since a cylindrical member or an inner frame body is interposed therebetween, the tightened state can be extremely strong without rattling, and construction accuracy during temporary construction can be improved.

(a) Since the cylindrical member that fits the nut is integrally fixed to the outer band-shaped ring hoop, assembly is much easier than when these are constructed separately.

Benefits such as:

After the construction of the building is completed, (c) Tighten and fix the band-shaped ring hoop and the inner band-shaped partial ring hoop from both the inside and outside of the main reinforcement of the column at the connection point of the main reinforcement of the beam (i.e., the point where the through-bars are connected). As a result, the strength of the joints between the columns and beams can be greatly improved.

(d) Because the nuts are not only tightened from the outside of the main reinforcing bars of the columns, but also from the inside, even if a large tensile force is generated at the joints of the columns and beams, the joints of the columns and beams are At this point, the beam main reinforcing bars can be completely fixed to the column main reinforcing bars, preventing the beam main reinforcing bars from slipping.

Benefits such as these can be obtained.

Hereinafter, embodiments of the present invention will be described based on illustrative drawings.

In FIGS. 1, 2, and 3, reference numerals 1, . . . are main reinforcing bars of a reinforced concrete column A arranged in a circular shape in plan view, and the outer periphery thereof is surrounded by spiral hoop reinforcing bars 2. 2'... is a hoop muscle. At the cross connecting portion C of the column A to the beam B, outer belt-shaped ring hoops 4, 4 are provided to surround the outer periphery of the main reinforcing bars 1, and the main reinforcing bars 1...
Inner band-shaped partial ring hoops 5, 5 are abutted on the inner periphery of . . . at height positions opposite to the outer band-shaped ring hoops 4, 4.

A cylindrical member 6 is integrally welded and fixed to the outer band-shaped ring hoops 4, 4.

Inner frame bodies 7, 7 are abutted against the inner circumferential surfaces of the inner ring hoops 5, 5. The inner frame bodies 7, 7 are each formed into a convex arcuate surface as a whole so that the outer surface thereof can be brought into close contact with the inner circumferential surface of the inner ring hoop 5, 5, and
The inner surface thereof is formed into a flat surface so that it can be closely attached to a nut 8, which will be described later. Regarding its shape, various design changes are possible as shown in FIG. 5 A, B, C, and D.

9... are through bars made of threaded reinforcing bars that are connected to the main reinforcing bars 9' of the reinforced concrete beam B, and are respectively connected to the cylindrical member 6 of the outer band-shaped ring hoop, the inner band-shaped ring hoop 5, and It is provided so as to penetrate through the entire inner frame body 7.

Nuts 8 are pre-installed in the through lines 9 at the outer positions of the cylindrical members 6 and the inner positions of the inner frame body 7.
are inserted, and by tightening these nuts 8 from both the inside and outside, the threads 9 are inserted into the columns A.
It is firmly connected and fixed to the main reinforcing bars 1.

Thereafter, the beam main reinforcing bars 9'... and the through bars 9... are connected by mechanical joints or the like to complete the connection of the columns and beams.

In addition, as a means of connecting the through bar 9 and the main reinforcing bar 9' of the beam, a threaded reinforcing bar is used as the main reinforcing bar 9', and both 9 and 9' are connected with a coupler and a lock nut, or a threaded reinforcing bar is used as the main reinforcing bar 9'. Any suitable means can be employed, such as using knotted reinforcing bars or other deformed reinforcing bars, and connecting both 9 and 9' with a crimp sleeve.

Further, the outer band-shaped ring hoop 4 can be manufactured by any method such as processing a flat bar into a closed loop shape or cutting a steel pipe into rounds of appropriate width. Various manufacturing methods can also be used for the inner band-shaped ring hoop 5, such as bending a flat bar into a partial arc shape, or cutting the above-mentioned ring hoop into a plurality of pieces in the circumferential direction.

The inner frame body 7 may be fixed to the inner ring hoop 5 in advance by welding or the like.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the structure according to the present invention, and FIG. 1 is an overall side view, FIG. 2 is an overall plan view, FIG. 3 is a detailed plan view with a partial cross section of the main part, and FIG. The figure is a partially sectional detailed side view, Figure 5 A,
B, C, and D are perspective views of main parts showing different embodiments. DESCRIPTION OF SYMBOLS 1... Main reinforcing bar of column, 4... Outer band ring hoop, 5... Inner band ring hoop, 6... Cylindrical member, 7... Inner frame, 8... Nut, 9...
Through bar, 9'...main reinforcing bar of the beam.

Claims (1)

[Scope of utility model registration request] The outer periphery of the main reinforcing bars 1 of the reinforced concrete column A arranged in a circular shape is connected to outer band-shaped ring hoops 4, 4.
while surrounding the outer band-shaped ring hoop 4,
4, the inner band-shaped ring hoops 5, 5 are applied to the inner periphery of the main reinforcing bars 1 of the column A, and the outer surfaces thereof are on the inner periphery of the inner band-shaped ring hoops 5, 5. Abutting the inner circumferential surfaces of the inner band-like ring hoops 5, 5 with the inner frame bodies 7, 7, which are formed as a whole into a convex arcuate surface so as to be able to fit closely together, and whose inner surfaces are formed into a flat surface; Then, through-bars 9 are installed to pass through all of the inner and outer ring hoops 4, 4, 5, 5 and the inner frames 7, 7, and are connected to the main reinforcing bars 9' of the reinforced concrete beam B. A cylindrical member 6 having a flat outer end surface is integrally fixed to each of the outer band-shaped ring hoops 4, 4 at each of the penetration points of the through-line 9. A reinforced concrete beam for a main reinforcing bar of a reinforced concrete column, characterized in that it is tightened and fixed from the outside and from the inside of the inner frame bodies 7, 7 by integral nuts 8 screwed into the through bars 9... Fixed structure of main reinforcing bars.