JPH06306935A - Connection structure of column and beam of rc structure and its construction - Google Patents

Abstract

PURPOSE:To eleminate conventional troublesome connection of reinforcements which were connected one by one and industrialize and automate it and further, obtain a firm joint of a column with a beam having a high quality. CONSTITUTION:A steel framed unit (a) for connection where horizontal steel frames 4 are projected at the outer periphery of a vertical steel frame 3 or a steel framed unit (c) for connection made of horizontal steel frames 19, are erected in a column-beam connection area. The vertical steel frame 3 of the steel framed unit (a) is inserted or the horizontal steel frame 4 is inserted in a beam 8 or the horizontal steel frame 19 of the steel framed unit (c) is inserted in a beam 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column-beam joint structure of RC structures and a construction method thereof.

[0002]

2. Description of the Related Art In general, the column-beam joints of RC structures are
Although the column main bar and the beam main bar in the X and Y directions intersect in a narrow area, the grip column hoop line is also incorporated, and the accommodation is very complicated.

[0003]

[Problems to be Solved by the Invention] Pillars of this RC structure
In the column-beam rebar joint at the beam joint, in the lap joint, the lap length is 35 to 45 times the diameter of the rebar, the bar arrangement becomes more complicated, and splitting of the cover concrete easily occurs. Usually, a pressure welding joint is used. However, even in this pressure-welded joint, it takes a lot of time and troublesome work to assemble the rebars of the column-beam joints, which require joints one by one while securing a required work space. This is an RC structure. It is a factor that hinders the promotion of industrialization and automated construction of the frame. An object of the present invention is to eliminate such conventional problems. Another object of the present invention is to provide a strong column-beam joint having good quality.

[0004]

Means for Solving the Problems Pillars of the RC structure of the present invention
In the beam joint structure, a joint steel frame unit is installed in a column / beam joint region, and the column and the beam are joined through this joint steel frame unit. As the above-mentioned joining steel frame unit, as shown in the first embodiment, a joining steel frame unit a having a horizontal steel frame 4 protruding from the outer periphery of a vertical steel frame 3 is provided, and the vertical steel frame 3 is used as a column 12 and the horizontal steel frame 4 is used as a beam. It is preferable that the horizontal steel frame 19 is placed in the beam 24 or the horizontal steel frame 19 is placed in the beam 24 as shown in the second embodiment.

[0005]

In the column / beam joint structure according to the present invention, the column and the beam are joined by the joining steel frame unit installed in the column / beam joint region, so that the quality and strength are improved and improved. Further, since it is not necessary to perform a complicated joint of a reinforcing bar as in the conventional case, the construction is easy and it is also useful for promoting automated construction.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the first embodiment shown in FIGS. 1 to 8 will be described. Reference symbol a is a steel frame unit for joints. The steel frame unit a for joints has a horizontal steel frame 4 made of H steel projecting from the outer periphery of the center of a vertical steel frame 3 of a required length having flanges 2 on each long side end surface of a cruciform core rod 1. In this embodiment, however, four horizontal steel frames 4 are provided so as to project in four directions so as to fit the beams orthogonal to each other.

Although not shown in FIGS. 1, 2 and 6, a large number of stud bolts 6 are planted on the outer surfaces of the flange 2 of the vertical steel frame 3 and the flange 5 of the horizontal steel frame 4 as shown in FIG. Alternatively, as shown in FIG. 4, a large number of bearing plates 7 are stretched between the flanges 2 of the vertical steel frames 3 and between the flanges 5 of the horizontal steel frames 4 to increase the adhesive force of the concrete to the steel frame unit a. I am trying.

In the steel frame unit a for joints, the four horizontal steel frames 4 are projected into the respective reinforcing bar cages 9 of the four beams 8 which are orthogonal to each other, whereby the main beam bar 10 has its ends. It is located outside the horizontal steel frame 4 and the beam stirrup 1
1, and the required vertical length of the vertical steel frame 3 is projected into each of the column reinforcing bar cages 13 of the upper and lower columns 12, whereby the column main bar 14 positions its end outside the vertical steel frame 3. In addition, the structure in which the column hoop muscles 15 are restrained and the entire state is buried in the cast concrete 16 is the column-beam joint of the present invention.

The construction method of the column-beam joint portion of the first embodiment will be described with reference to FIGS. Column main muscle 1
A rebar cage 13 for columns, which is composed of 4 and column hoop reinforcements 15, is established at a predetermined position, and an end portion of a rebar cage 9 for beams composed of main beam reinforcements 10 and beam stirrup reinforcements 11 is exposed to the upper end opening four sides thereof. . In this case, the required number of beam stirrup bars 11 on each end side are brought closer to the beam center side, and the column reinforcing bar cage 13
Between the upper opening of the and the ends of the four-beam girder cage 9
A beam joint vacant space b is formed, and the steel frame unit a for a joint is set in the vacant space b by dropping it from above, and at the same time, the beam stirrup streak 11 is set to the beam center side.
The beam main bar 10 at a predetermined opposing position surrounding the horizontal steel frame 4.
Restrain. Note that the required number of beam stirrup reinforcements on the end side are removed, the joint steel frame unit a is dropped into the space b from above and set, and the removed reinforcements are placed at the predetermined positions. It is apparent that the horizontal steel frame 4 and the beam main bar 10 may be constrained by being stretched.

After that, concrete 16 is poured, and the steel frame unit a for joints, the reinforcing bar cage 13 for columns and the reinforcing bar cage 9 for beams are buried and integrated as a whole. In addition, beam 8, pillar 1
The form surrounding 2 and the pillar-beam joint is set appropriately at a suitable time before concrete is placed.

Another construction method of the column-beam joint portion of the first embodiment will be described with reference to FIGS. 7 and 8. A precast concrete casting formwork body 17 for a beam in which a reinforcing bar cage 9 for a beam composed of a beam main bar 10 and a beam stirrup bar 11 is embedded, and a reinforcing bar car 13 for a column composed of a column main bar 14 and a column hoop bar 15 A precast concrete driving form part 18 for pillars which has been embedded is prepared in advance, and a precast concrete driving form part for beams is provided in four directions on the upper end opening of the precast concrete driving form part 18 for pillars established at a predetermined position. The end of 17 is mounted on board.

In this case, the required number of beam stirrup reinforcements 11 on each end side of the mold frame body 17 are removed, and the upper end openings of the mold frame body 18 and the four side frame mold bodies 17 are removed. A column / beam joint vacant space b is formed between the end and the end, and the joint steel frame unit a is set by dropping it from above, and the removed reinforced reinforcement is stretched. As a result, the beam stirrup bar 11 is closed at a predetermined facing position surrounding the horizontal steel frame 4 to restrain the beam main bar 10.
After that, concrete 16 is poured to integrate the steel frame unit a for joining and the above-mentioned form parts 17 and 18.

Next, the second embodiment shown in FIGS. 9 to 14 will be described. Reference numeral c is a steel frame unit for joints. The steel frame unit c for the joint portion is composed of a horizontal steel frame 19 made of H steel material, and in this embodiment, the horizontal steel frame 19 is used.
Has a plane cross shape that extends in all directions to fit the orthogonal beams.

Although not shown in FIGS. 9, 10 and 14, the flange 2 of the horizontal steel frame 19 is shown in FIG.
0 is planted with a large number of stud bolts 21 or, as shown in FIG. 12, a large number of bearing plates 22 are stretched between the flanges 20 to attach concrete to the main joint steel frame unit c. I try to increase the fit.

Reference numeral 23 'denotes a hoop reinforcing member which is vertically installed in a plurality of steps between the bases of the respective horizontal steel frames 19 extending in four directions as described above.

In this joining-unit steel frame unit c, four horizontal steel frames 19 are thrust into the respective reinforcing bar cages 25 of the beams 24 which are orthogonal to each other, whereby the beam main bars 26 have their ends at the ends of the horizontal steel frame 19. The column main bar 3 which is located outside and is restrained by the beam stirrup reinforcement 27 and is restrained by the column hoop reinforcement 30 of each column reinforcing bar cage 29 of the upper and lower columns 28.
The column-beam joint portion of the present invention is a structure in which the column 1 is inserted into and restrained by the column hoop reinforcement 23 laid on the horizontal steel frame 19 and the entire state is embedded in the cast concrete 32.

The pillar of this second embodiment will be described with reference to FIGS.
The method of constructing the beam joint is as follows. A rebar cage 29 for columns, which is composed of the column main bars 31 and the column hoop bars 30, is established at a predetermined position, and the end portions of the beam reinforcing bar cage 25, which are composed of the beam main bars 26 and the beam stirrup bars 27, are formed on the four sides of the upper end openings thereof. To face. In this case, the required number of beam stirrup reinforcements 27 on each end side are brought closer to the beam center side, and a pillar-beam connection is made between the upper end openings of the column reinforcing bar cages 29 and the ends of the four beam reinforcing bar cages 25. Partial space d is formed, and the joint steel frame unit c is set in the space d by dropping it from above, and at the same time, the beam stirrup streak 27, which has been moved to the beam center side, surrounds the horizontal steel frame 19 The beam main reinforcement 26 is restrained in the position. It is to be noted that the required number of beam stirrup reinforcements on the end side are removed, the joint steel frame unit c is set in the empty space d from above, and the removed reinforcements are placed at predetermined positions. It is clear that the horizontal steel frame 19 and the main beam reinforcement 26 may be constrained by being stretched over.

After that, concrete 32 is poured, and the steel frame unit c for joints, the reinforcing bar cage 29 for columns and the reinforcing bar cage 25 for beams are buried and integrated as a whole. The beams 24,
The form surrounding the column 28 and the column-beam joint is set appropriately at an appropriate time before concrete is poured.

The construction of the column-beam joint of the second embodiment is the same as that of the column-beam joint of the first embodiment.
It is clear that the structure can be constructed by using the precast concrete driving form part for a beam in which the reinforcing bar cage 25 for a beam is embedded and the precast concrete driving form part for a column in which a reinforcing bar cage 29 for a column is buried.

[0020]

As is clear from the above description,
The column-beam joint structure according to the present invention has the following effects. Since the column and the beam are joined by the joining steel frame unit installed in the column-beam joining region, the quality and strength are improved and improved as compared with the conventional column-beam joining structure by the reinforcing bar joint. Therefore, the strength of the stress transmission part between the steel frame and the beam is improved, and the bending hinge of the beam is generated on the tip end surface of the steel frame distant from the side surface of the column. Compared to the structure, when the same beam cross section and the same reinforcing bar amount, it is possible to make the maximum span of the column longer than that of the conventional joint structure of reinforcing bar joints. The amount of rebar (main bar) can be reduced (Fig. 15,
16).

Furthermore, since it is not necessary to perform a complicated joint for each rebar as in the conventional case, the construction thereof is easy,
It also helps to promote industrial and automated construction.

[Brief description of drawings]

FIG. 1 is a plan view of a pillar / beam joint structure of an RC structure according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of the above.

FIG. 3 is a perspective view of a steel frame unit for a joint part in which the above-mentioned stud bolt is planted.

FIG. 4 is a perspective view of a joining-unit steel frame unit in which a bearing plate is stretched.

FIG. 5 is a perspective view showing a state of constructing the column-beam joint structure of the first embodiment, and is a perspective view of a state in which a column reinforcing bar cage and a beam reinforcing bar cage are set.

FIG. 6 is a perspective view showing a situation in which a steel frame unit for a joint portion is dropped into a space of a column / beam joint portion of the above.

[Fig. 7] Fig. 7 also shows another example of the construction state of the column-beam joint structure of the first embodiment, in which a precast concrete driving form part for columns and a precast concrete driving form part for beams are used. It is a perspective view of the state which set.

FIG. 8 is a perspective view showing a situation in which a steel frame unit for a joint portion is dropped into a space of a pillar / beam joint portion of the same.

FIG. 9 is a plan view of a pillar / beam joint structure of an RC structure according to a second embodiment of the present invention.

FIG. 10 is a vertical sectional view of the above.

FIG. 11 is a perspective view of a steel frame unit for a joint part in which the above-mentioned stud bolt is planted.

FIG. 12 is a perspective view of a joining-unit steel frame unit in which the above-mentioned pressure bearing plate is stretched.

FIG. 13 is a perspective view showing a state of construction of the column-beam joint structure of the second embodiment, and is a perspective view of a state where a column reinforcing bar cage and a beam reinforcing bar cage are set.

FIG. 14 is a perspective view showing a state in which a steel frame unit for a joint portion is dropped in a space of a pillar / beam joint portion in the above.

FIG. 15 is an explanatory diagram showing a column span due to a column-beam joint portion having a conventional structure.

FIG. 16 is an explanatory diagram showing a column span according to the column-beam joint structure of the present invention.

[Explanation of symbols]

a, c Steel frame unit for connection b, d Space treatment for column / beam connection 3 Vertical steel frame 4,19 Horizontal steel frame 8,24 Beam 9,25 Beam rebar cage 12,28 Column 13,29 Column rebar cage 16,32 Concrete 18 Precast concrete driving formwork for pillars 17 Precast concrete driving formwork for beams

Front page continuation (72) Inventor Yoshiaki Senoo 2 Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd.

Claims (7)

[Claims] 1. A column-beam joint structure of an RC structure, wherein a joint steel frame unit is installed in a column-beam joint region, and the column and the beam are joined through this joint steel frame unit. 2. The joining steel frame unit is formed by projecting a horizontal steel frame on the outer periphery of a vertical steel frame, and the vertical steel frame is placed in a pillar and the horizontal steel frame is placed in a beam. Column / beam joint structure of RC structure. 3. The joining steel frame unit comprises a horizontal steel frame,
The column-beam joint structure of an RC structure according to claim 1, wherein the horizontal steel frame is positioned so as to project into the beam. 4. An end of the beam reinforcing bar cage is made to face the upper end opening of the established column reinforcing bar cage, and a column / beam joint space is formed between them, and the outer periphery of the vertical steel frame is formed in the space. Set by dropping the steel frame unit for the joint, which is formed by projecting a horizontal steel frame from above, into the concrete, and then placing concrete, and burying the steel frame unit for the joint, the rebar cage for columns and the rebar cage for beams. Pillars characterized by integrating the whole
Construction method of beam joint. 5. A precast concrete driving form part for a column, in which a reinforcing bar car for a column is buried, is established, and a precast concrete driving form part for a beam in which a reinforcing bar car for a beam is buried is formed in an upper end opening. The pillars and beams joint space is formed between them by mounting the ends of them, and a steel frame unit for the joint, which is formed by projecting a horizontal steel frame around the outer circumference of the vertical steel frame, is formed in the space from above. It is set by dropping and then concrete is poured to integrate the steel frame unit for joints, the precast concrete driving form body for columns and beams, and the column-beam joints. Construction method. 6. An end of the reinforcing bar cage for a beam faces the upper end opening of the established reinforcing bar cage for a pillar, and a space for connecting the pillar and the beam is formed between them, and the space is composed of a horizontal steel frame. Set by dropping the steel frame unit for the joint from above,
After that, a method of constructing a column-beam joint, which comprises placing concrete and burying a steel frame unit for the joint, a reinforcing bar cage for the column, and a reinforcing bar cage for the beam to integrate the entire structure. 7. A precast concrete driving form part for a column, in which a precast concrete driving form part for a column, in which a reinforcing bar car for a column is embedded, is established, and a reinforcing bar car for a beam is buried in the upper end opening. Set the end of the vehicle by mounting and installing a space between the pillar and beam joints between them, and then dropping a steel frame unit for the joint consisting of horizontal steel from above into the space, and then concrete Place the
A method for constructing a column-beam joint characterized by integrating a steel frame unit for joints, and a precast concrete driving formwork for columns and beams.