JPH07317149A - Execution method of reinforced concrete column and beam frame - Google Patents

Abstract

PURPOSE:To provide a RC column and a beam frame in which the strength in the connecting part between the column pillar and the beam is enhanced, and the sections of the column and beam are minimized. CONSTITUTION:A steel pipe member 1 having a prescribed height H to be set in a column-beam connecting part has a beam main reinforcement hole 2, a beam main reinforcement 3 is inserted through the beam main reinforcement hole 2, and a stirrup 4 is wound on the beam main reinforcement 3 to preliminarily assemble a beam reinforcement unit A in a constructing site. A column main reinforcement is assembled, and a hoop reinforcement is wound thereon to assemble a column reinforcement, and the beam reinforcement unit A is built in the column-beam joining part. The adjacent beam reinforcement units A, A are mutually connected by the direct joint between the end parts of the beam main reinforcements 3. After the building of a form, concrete is placed therein. Since the steel pipe member 1 consisting of a high strength material is used, the strength of the column-beam joining part can be enhanced, and a multistory or extra multistory RC building having a high rigidity and a high quality can be efficiently executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a reinforced concrete structure (hereinafter sometimes abbreviated as RC structure) column and beam frame structure in which the joint portion between the column and the beam is strengthened to reduce the cross section of the column beam. .

[0002]

2. Description of the Related Art RC buildings, which are inexpensive to construct, are more commonly used in middle and low-rise buildings, which are the majority in Japan. However, when adopting RC construction for high-rise or super-high-rise buildings, high strength is required at the joints between columns and beams. In such a case, conventionally, for example, as shown in FIG. 6, a plurality of U-shaped beam main bars c in which a stirrup d is wound around a column main bar a in which a hoop bar is wound are crossed in a joint portion of a column and a beam. Sir,
The column main reinforcement a and the beam main reinforcement c are joined by the joint hoop reinforcement e for construction.

[0003]

In the case of an RC building having a low-to-medium-rise building, since the strength required for the beam-column joint is moderate, the construction of the beam-column joint hardly poses a problem. It was On the other hand, in the case of a high-rise or super-high-rise RC building, which has recently been in great demand for wealth, high-strength construction of column-beam joints becomes a problem. Further, in the future, not only this high-rise or super-high-rise building, but also the conventional middle- and low-rise buildings, there is a tendency to reduce the column-beam cross section, secure an effective space, reduce the cost of the frame, etc. It is expected to grow.
In short, in the RC member in which a relatively high stress acts in inverse proportion to the cross-sectional dimension, the strength problem of the column-beam joint, which has not been a problem in the past, has become apparent.

In this respect, in the case of constructing a high-rise building by the conventional RC construction method shown in FIG. 6, a large amount of shear reinforcing bar e is required at the column-beam joint, and the U-shaped beam main bar is also required. In many cases, c is used, and the work of assembling the reinforcing bar is complicated, difficult and inefficient, and it is difficult to secure the safety and quality of the work at high places, which is a problem. Therefore, the object of the present invention is to construct a reinforced concrete column or a beam frame structure in which a beam-column joint of a high-rise building or a super-high-rise building can be efficiently and safely constructed, and the strength and strength of the beam are relatively reduced. To provide a method.

[0005]

[Means for Solving the Problems] As means for solving the above-mentioned problems of the prior art, a method of constructing a reinforced concrete column or a beam frame is as follows: (a) A predetermined height to be installed at a joint portion of the column with the beam. The beam main bar hole 2 is provided in the steel tubular member 1 of H, the beam main bar 3 is inserted into the beam main bar hole 2, the stirrup 4 is wound around the beam main bar 3, and the beam reinforcing bar unit A is installed on site. The step of pre-assembly (Fig. 1) and (b) the column main bar 5 is assembled, the hoop bar 6 is wound around the column main bar 5 to assemble the column rebar B, and the beam is connected to the column-beam joint. The step of building the reinforcing bar unit A (Fig. 2), (c) the step of joining the adjacent beam reinforcing bar units A, A by the direct joint of the ends of the beam main bar 3 (Fig. 3), and (d) the pillar After placing the beam and slab formwork, the step of placing concrete, and more It is characterized by being formed.

In the beam reinforcing bar unit, the beam main bar 3 having a length L which avoids the joint of the yield zone from each side surface of the steel tubular member 1 is inserted into the beam main bar hole 2 of the steel tubular member 1, A stirrup 4 is wound around the beam main bar 3 to form a beam rebar unit A'composed first, and the beam rebar unit A'is built in a joint portion of a column rebar B, and the adjacent beam rebar units A ′, A ′ is a pre-assembled intermediate beam reinforcement unit C with a length previously filled in between adjacent beam reinforcement units A ′,
It is also characterized in that it is suspended between A'and the two main bars 9 and 3 are joined together (Fig. 4).

[0007]

Since the joint between the column and the beam is stable in quality and is constituted by the steel tubular member 1 made of a high-strength material, the quality and yield strength of the column-beam joint can be improved and the cross section of the beam can be reduced. . Moreover, since the reinforcement work and the assembling work of the beam reinforcing bar need only be passed through the beam main bar hole 2 of the steel tubular member 1 at the site, it can be performed extremely easily. Since no hoop reinforcement is required, the beam reinforcement unit A can be efficiently assembled in advance (Fig. 1). Further, when the beam rebar is pre-assembled, the height H of the steel tubular member 1
Since the height is low, it is possible to assemble the beam reinforcing bar unit A largely by attaching the long beam main bar 3 in a plane at the site without the work at a high place as long as the space can be secured.

The beam rebar unit A is easy to handle and can be easily and efficiently built in the column rebar B (FIG. 2). After building, it is only necessary to join the main bars 3, 3 to each other with a direct joint such as a grout joint 7 (Fig. 3), so that the work efficiency is dramatically improved, and the toughness of the beam-column joint is improved. It is possible to realize high-quality and excellent reinforced concrete columns and beam frames.

[0009]

EXAMPLE An example of the present invention shown in the drawings will be described below.
FIG. 1 shows a beam reinforcing bar unit A provided at a joint between a column and a beam. The beam reinforcing bar unit A includes a steel tubular member 1 installed at a joint portion of a column with a beam, a beam main bar 3 assembled on the basis of the steel tubular member 1, and a stirrup wrapped around the beam main bar 3. It is composed of 4 and.

The steel tubular member 1 has a side of about 700 to 900.
mm square steel pipe (however, the shape is not limited to this and may be circular, etc.), and its height H is approximately 700 to 800 mm, which is sufficient for mounting the beam main bar 3 at the beam-column joint. Has been done. Therefore, a plurality of beam main bar holes 2 through which the beam main bar 3 can be inserted are preliminarily factory-processed at a vertical position on each side surface of the steel tubular member 1 in a staggered arrangement in each direction. Therefore, at the site, the beam main hole 2
By inserting the main beam 3 of the beam (the length is about 6 m in the case of a column span of 6 m), the main beam 3 of the beam extending in a cross shape in a plane cross shape is formed. However, with respect to the steel tubular member 1 at the end position, the beam main bar 3 is formed in a plane T shape or L shape (see FIG. 5). Then, the stirrup 4 is wound around the outer circumference of the beam main bar 3 excluding the inside of the steel tubular member 1. Also,
Nut 10 for screw rebar (or number wire, etc. not shown)
Thus, the steel tubular member 1 and the beam main bar 3 are tightly connected and fixed.
Since the pre-assembly of the beam rebar unit A is performed at the site on the ground, the work can be efficiently and safely performed.

FIG. 2 shows the steps of assembling the column rebar B and assembling the beam rebar unit A. The column reinforcing bars 5 are assembled by vertically assembling the main column reinforcing bars 5 at a predetermined position and winding the hoop reinforcing bars 6 around the beam lower portion excluding the column-beam joints. When concrete is cast separately, a pillar formwork is built up to the bottom of the beam and concrete is placed (not shown). Subsequently, the beam rebar unit A (steel tubular member 1) to which the beam main bars 3 are attached in advance is suspended from above, and the column main bars 5 are arranged so as to be inserted into the hollow inside of the steel tubular member 1. The installation of the beam reinforcing bar unit A is completed by dropping it to the beam joining position in the main reinforcement 5 (see FIG. 3). Since the steel tubular member 1 is present in the beam-column joint to enhance the proof stress, and the reinforcing bar arrangement of each main bar 3 is fixed, the inside of the beam-column joint is as shown in FIG. No processing is required for the joint hoop muscles and stirrup bar arrangements (see FIG. 6).

After the construction of the beam rebar unit A is completed, the beam main bar 3, between the adjacent beam rebar units A, A is
The ends of 3 are directly joined to each other at a substantially central position between the columns (however, the joining position is not limited to this central position). As a direct joint means, the grout joint 7 is formed, for example, by screwing the main bars 3 and 3 into contact with each other.
Etc. Specifically, the main bars 3 and 3 are joined by screw joining, and grout is injected into the grout joint 7 to make a permanent joined state.

Thereafter, columns, beams and slab formwork (not shown) are built and concrete is poured. Since the above steps are performed one layer at a time, by repeating the same step of stacking the beam reinforcing bar unit A until reaching a desired floor, a reinforced concrete column or beam frame structure having a beam-column joint with high strength can be obtained. Will be constructed.

[0014]

[Second Embodiment] FIG. 4 shows an embodiment in which a beam reinforcing bar unit A in which the length of the main beam 3 is specified is used. The construction procedure is substantially the same as that of the first embodiment, but the length L of the main beam 3 of the beam protruding from the side surface of the steel tubular member 1 of the beam reinforcing bar unit A ′ in this example is equal to 700 ~
800-mm) 1.0-1.5 times 700-1200
formed to mm. This is because the rebar joint is not located in the so-called yield zone. Further, according to the beam reinforcing bar unit A ′, since the length of the beam main bar 3 is short, it is possible to assemble the beam reinforcing bar unit A ′ and the column reinforcing bar B after preassembling them at the ground site, and to assemble them. The secondary effect is that transportation is convenient. Usually, after the beam reinforcing bar unit A'is built in the column reinforcing bar B, a prefabricated intermediate beam reinforcing bar unit C is suspended between the adjacent beam reinforcing bar units A'and A '. The intermediate beam reinforcement unit C has a length (approximately 2500 to 3000) that fills the space between the adjacent beam reinforcement units A ′ and A ′.
mm) main bar 9 and a stirrup 8 wound around the outer circumference of the main bar 9. The intermediate beam reinforcement unit C
Butt the main bar 9 of the to the main bar 3 of the beam rebar unit A ′,
The two main bars 3, 9 are joined by the grout joint 7 described above. After that, by constructing a formwork and placing concrete, RC small columns and beams having a small cross-section frame, in which the strength of the beam-column joint is intended, are constructed as in the first embodiment.

[0015]

EFFECTS OF THE INVENTION According to the method for constructing a reinforced concrete column or beam frame according to the present invention, since the steel tubular member 1 of constant quality and high strength is used in the joint portion with the beam, the column is used. It contributes to efficient construction of high-quality high-rise, high-rise RC building with high toughness by strengthening beam joints. Further, since the beam reinforcing bar unit A in which the beam main reinforcement 3 and the stirrup 4 are attached to the steel tubular member 1 is assembled first, it contributes to the reduction of the number of frames, the construction cost and the improvement of safety.
Further, when it is applied to a conventional RC building, the strength of the beam-column joint is improved, and as a result, the beam-column cross-section is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a beam reinforcing bar unit.

FIG. 2 is a front view showing a step of building a beam reinforcing bar unit.

FIG. 3 is a front view showing a joined state of a beam reinforcing bar unit.

FIG. 4 is a front view showing the main steps of the second embodiment.

FIG. 5 is an enlarged vertical sectional view of a beam-column joint portion.

FIG. 6 is an enlarged vertical sectional view showing a conventional beam-column joint.

[Explanation of symbols]

 A beam rebar unit B column rebar C intermediate beam rebar unit 1 steel tubular member 2 beam main bar hole 3,9 beam main bar 4,8 stirrup 5 column main bar 6 hoop bar

Front page continuation (72) Inventor Koji Murata 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Yasuo Higashibata 1-5, Otsuka, Inzai-cho, Inba-gun, Chiba Prefecture Takenaka Corporation Technical Research Institute

Claims (2)

[Claims] (A) A beam main bar hole is provided in a steel tubular member of a predetermined height installed at a joint with a beam in a column, and the beam main bar is inserted into the beam main bar hole to attach the beam main bar to the beam main bar. The stage of pre-assembling the beam reinforcement unit formed by winding the stirrup at the site site, and (b) assembling the column main bar, and winding the hoop reinforcement around the column main bar to assemble the column reinforcing bar, And (c) connecting adjacent beam rebar units by direct joints at the ends of the beam main bar, and (d) formwork for columns, beams and slabs. A method of constructing a reinforced concrete pillar or beam frame, which comprises the steps of placing concrete after erection. 2. The length of a steel tubular member having a predetermined height, which is installed at a joint with a beam in a column, is provided with a hole for a beam main bar so as to avoid a joint in a yield zone from each side surface of the steel tubular member. Inserting the beam main bar having the above into the beam main bar hole and pre-assembling the beam reinforcing bar unit formed by winding a stirrup around the beam main bar at the site site, and (b) assembling the column main bar, A step of winding a hoop reinforcement on the column to assemble a column rebar, and building the beam rebar unit at the joint between the column and the beam,
(C) Suspend an intermediate beam rebar unit pre-assembled to a length to fill the space between adjacent beam rebar units between adjacent beam rebar units, and connect the main bar of the beam rebar unit and the main bar of the intermediate beam rebar unit to each other. The stage of joining, (D) Pillar,
A method of constructing a reinforced concrete column or beam frame, comprising the steps of placing concrete after the form of beams and slabs have been built.