JPH0518113A - Prefabricated reinforcing bar construction method for steel framed reinforced concrete structure - Google Patents

Abstract

PURPOSE:To simplify the arrangement of reinforcing bars and improve work efficiency by fixing pillar main reinforcements and beam main reinforcements to pillar steels and beam steels, arranging shear reinforcing bars around the main reinforcements, and prefabricating the pillar steels, beam steels, and the reinforcing bars. CONSTITUTION:End sections 5a..., 9a... of pillar main reinforcements 5... and beam main reinforcements 9... are fixed to flanges 4a..., 8a... of pillar steels 4, 4 and beam steels 8, 8 by welding, screwing, or with lap joints, Shear reinforcing bars 6..., 10... are arranged around the pillar main reinforcements 5 and the beam main reinforcements 9 to surround them, and steels of a pillar 2 and beams 3, 3 and reinforcing bars are prefabricated. The pillar steels 4 and the beam steels 8 are erected, a framework is fitted to them, and concrete W is placed to complete the pillar 2 and the beams 3. The connection of the steels in a connection section 7 is simplified, and the degree of freedom for designing a building can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-assembled reinforcing bar construction method for a steel frame reinforced concrete structure.

[0002]

2. Description of the Related Art Conventionally, when constructing a steel-framed reinforced concrete structure, the reinforcements of columns and beams and their joints have been installed at predetermined positions in the column steel beams and beam steel frames, and then the column main beams and beam main reinforcements have been constructed on site. It was generally assembled in the field by attaching the shear reinforcements around the column main reinforcement and the beam main reinforcement around the column main reinforcement and the beam main reinforcement.

[0003]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the following problems in the prior art described above.

[0004] Firstly, in the field, the reinforcement is forced to be arranged on a steel frame that has been assembled high, which is not only dangerous but also troublesome if a large number of reinforcements are attached when the feet are in poor condition. It will be. In particular, since the reinforcing bars are crowded in the vicinity of the joints between the columns and the beams, the work efficiency is significantly reduced, and there is a problem that the joints are complicated and the design is restricted. Secondly, there is also a problem that the design in the vicinity of the joint becomes complicated for the above reason, and it becomes difficult to secure the closing property of the shear reinforcing bar of the column and the beam.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pre-assembled rebar construction method for a steel-framed reinforced concrete structure capable of improving the construction efficiency.

[0006]

In the pre-assembled reinforcing bar construction method for a steel reinforced concrete structure of the present invention, a column main bar and a beam main bar are fixed in advance to the column steel beam and the beam steel frame, and a column around the column main beam and the beam main bar is provided. A step of arranging shear reinforcing bars in a form of winding the main bars and beam main bars to pre-assemble the steel frame and the reinforcing bars of the columns and beams, and the column steel frame and the beam steel frame in which the respective main bars and the shear reinforcing bars have been arranged And the step of mounting the concrete on the column steel frame and the beam steel frame and placing concrete after the completion of the building process to complete the column and the beam. The method is to solve the above-mentioned problems by performing welding, fixing the ends of each main bar to the flanges of the column steel frame and the beam steel frame by welding, screwing or lap joints, etc. And

[0007]

According to the prefabricated reinforcing bar construction method for the steel-framed reinforced concrete structure of the present invention, the column main bar and the beam main bar are welded at their ends in front of the column or beam, their ends are welded, screwed, or lap jointed to form the column steel frame. Also, by fixing to the flange of the beam steel frame, it is possible to fix the column without fixing the beam to the joint between the column and the beam. Further, the joint of the reinforcing bars in the joint is simplified, and the degree of freedom in design is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
Will be described.

Reference numeral 1 in the drawing denotes a beam-column joint portion of the steel-framed reinforced concrete structure of this embodiment, which is constructed by the pre-assembled reinforcing bar construction method. As shown in FIG. 1, the beam-column joint portion 1 includes a column 2 formed vertically and a beam 3 vertically attached to the column 2.

As shown in FIGS. 1 and 2, a column 2 includes a column steel frame 4 formed by vertically standing H-shaped steel, and a column main bar 5 extending substantially along the length direction of the column steel frame 4. Concrete W is cast into a column skeleton 2a composed of column shear reinforcing bars 6 arranged in a form of being wound around the column main bars 5 to have a substantially square cross section.

The column main bars 5 are the flanges 4 on both sides of the column steel frame 4.
At both ends of a, a total of four are arranged on the outer surface thereof at a predetermined interval in a substantially parallel manner, and as shown in FIG. 3, the ends 5a on the joint 7 side of the pillar 2 and the beam 3 are bent. It is fixed to the flange 4a. The column shear reinforcement bars 6 are mounted so as to bundle the column main reinforcements 5 in a state of being in contact with the outer surface of each column main reinforcement 5, and are continuously provided at predetermined intervals in the longitudinal direction of the column main reinforcements 5.

As shown in FIG. 2, the joint portion 7 is formed in the central portion of the pillar 2, and the joint members 7a are arranged so as to extend uniformly from the substantial center of the pillar 2 in plan view in four directions. There is. The joining member 7a is an H-shaped steel, and is fixed at a position where the contact plates 7b fixed to the respective tips substantially come into contact with the tips of the beams 3 joined to the four sides of the joint 7.

As shown in FIGS. 1 and 2, the beam 3 includes a beam steel frame 8 in which H-shaped steel is horizontally arranged, and a beam main bar 9 extending substantially along the length direction of the beam steel frame 8. The concrete structure W is formed substantially in the same manner as the column 2 by placing concrete W on the beam framework 3a including the beam shear reinforcements 10 arranged in the form of being wound around the beam main reinforcements 9.

As shown in FIG. 1, an end portion of the beam steel frame 8 is provided on the side surface of the joint portion 7, and the joint portion 7 is welded to the joint portion 7 and protrudes outwardly from the joint plate 7. Has been fixed. Then, as shown in FIG. 2, the beam steel frame 8
Are fixed to the four side surfaces of the joint 7.

The beam main bars 9 are substantially parallel to the outer surfaces of the upper and lower flanges 8a of the beam steel frame 8 at a predetermined interval.
A book is arranged and, as shown in FIG. 3, an end portion 9a on the joint portion 7 side is bent and fixed to a flange 8a. The beam shear reinforcing bars 10 are mounted so as to bundle the beam main bars 9 in a state of being in contact with the outer surface of each beam main bar 9, and are continuously provided at predetermined intervals in the length direction of the beam main bars 9.

The above-described beam-column joint 1 is constructed as follows by the pre-assembled reinforcing bar construction method for the steel frame reinforced concrete structure of this embodiment. First, in the factory, the column main rebar 5 and the beam main rebar 9 are arranged on the column steel frame 4 and the beam steel frame 8, respectively. Next, the column reinforcement bars 6 and the beam reinforcement bars 10 are arranged in such a manner that the column reinforcement bars 5 and the beam reinforcement bars 9 are wound around the column reinforcement bars 5 and the beam reinforcement bars 9, and the steel frames of the columns 2 and 3 are arranged. And rebar are assembled in the above-mentioned form. As shown in FIG. 3, the column main bar 5 and the beam main bar 9 are welded to the flanges 4a and 8a at their ends 5a and 9a at positions before the joint 7 of the column steel frame 4 and the beam steel frame 8, respectively. Then, fix it so that it is almost tense. The welding is performed by flare welding or the like.

After the above steps are completed, the column steel frame 4 and the beam steel frame 5 on which the arrangement of the respective reinforcing bars has been completed are transferred to the work position and installed at a predetermined position.

After the building process is completed, the pillar main bar 5 and the beam main bar 9 are connected to the pillar steel frame 4 and the beam steel frame 8, respectively.
Further, a mold (not shown) is attached at a position where the beam 3 and the beam 3 are formed, and concrete W is placed to complete the column 2 and the beam 3.

According to the pre-assembled reinforcing bar construction method for the steel frame reinforced concrete structure of the present embodiment, the column main bar 5 and the beam main bar 9 are located in front of the columns 2 and 3 and their end portions 5a, 9a.
By fixing the to the flanges 4a, 8a of the column steel frame 4 and the beam steel frame 8, it can be fixed without being inserted into the joint 7 of the column 2 and the beam 3, and each main bar in the joint 7 and shear reinforcement. The design of the beam-column joint portion 1 is improved by simplifying the bracing.

Further, since the reinforcement of the column steel beams 4 and the beam steel frames 8 can be carried out in the factory to reduce the labor of the on-site reinforcement, it is possible to arrange the reinforcement in a place where the working environment is well prepared. Improves muscle work efficiency.

A second embodiment of the present invention will be described below with reference to FIGS.
Will be described. Reference numeral 20 in the drawing denotes a beam-column joint portion of the steel-framed reinforced concrete structure of this embodiment, which is constructed by the pre-assembled reinforcing bar method. It should be noted that the points different from those of FIGS. 1 to 3 of the beam-column joint portion 20 shown in FIGS. 4 and 5 are column main bars and beam main bars 21 to 24 in the drawings, and a fixing jig for fixing them. And nuts only.

As shown in FIGS. 4 and 5, the beam-column joint 2
0 indicates that the column main bar 21 and the beam main bar 22 are flanges 4a and 8a.
In the above, it is fixed to the fixing jig 23 welded in front of the joint 7.

The column main reinforcement 21 and the beam main reinforcement 22 are formed in a straight line and are arranged substantially parallel to the flanges 4a and 8a. Further, screws are threaded on the end portions 21a, 22a of the main column 21 and the main beam 22 on the joint 7 side.

The fixing jig 23 is an iron member formed in an L-shape when viewed from the front, and has a bottom portion 23a having a flange 4a,
It is fixed to the pillar 2 and the beam 3 by being welded to the joint portion 7 before being joined to 8a. As shown in FIG. 5, the bottom portion 23a
Is a trapezoidal shape in a plan view, and the short side formed to have a length substantially equal to the width of the flanges 4a and 8a is the joint 7 side, and the long side formed longer than the short side is short. It is arranged so as to uniformly project in the width direction from the flanges 4a and 8a on the opposite side of the side. Further, a main bar attachment portion 23b, to which the end portions 21a and 22a are attached and which supports the pulling force, is formed at the end portion on the long side of the bottom portion 23a so as to project upward. The main bar attaching portion 23b has a bottom portion 2.
3a extends along the long-side end of the flanges 4a, 8a
At both end portions projecting outward from both side surfaces in the width direction, a main-strip insertion hole 23c penetrating itself in the thickness direction is provided.
Ends 21a and 22a are inserted into the main muscle insertion hole 23c from the side opposite to the joint portion 7, and are attached by screwing nuts 24 into the portions of the end portions 21a and 22a protruding toward the joint portion 7 side. ing.

The above-mentioned beam-column joint 20 is constructed as follows in the steel frame reinforced concrete structure of this embodiment by the pre-assembled reinforcing bar construction method.

First, a fixing jig 23 is welded and fixed to the outer surfaces of the flanges 4a and 8a at the factory. Fixing jig 23
Is in a predetermined orientation as described above. Next, the main pillar 21
After fixing the end portion of the beam main bar 22 on the side opposite to the joint portion 7, the end portions 21 a and 22 a are inserted into the fixing jig 23.
Then, the nuts 24 are screwed into the ends of the end portions 21a and 22a protruding toward the 7 side of the fixing jig 23, whereby the column main bar 21 and the beam main bar 22 are substantially tensioned and fixed.

The column steel frame 4 and the column main bar 5 that have been installed
The column shear reinforcement 6 and the beam shear reinforcement 10 are attached in the same manner as in the first embodiment, and the column-beam joint 20 is constructed in the same manner as in the first embodiment.

According to the pre-assembled reinforcing bar construction method for the steel frame reinforced concrete structure of the present embodiment, the column main bar 21 and the beam main bar 22 are attached by screwing nuts 24 to the ends 21a, 22a. Compared with the method of directly welding to the flanges 4a and 8a shown in the embodiment, the column main bar 2
1 and the beam main bar 22 are easily tensioned so that they can be easily attached.

The third embodiment of the present invention will be described below with reference to FIG. Reference numeral 30 in the drawing denotes a beam-column joint portion of the steel-framed reinforced concrete structure of this embodiment, which is constructed by the pre-assembled reinforcement method. The column-beam joint portion 30 shown in FIG. 6 differs from the above-described FIGS. 1 to 3 only in the column main bars and beam main bars 31 to 34 in the figure, and in concrete and iron plate for fixing them.

As shown in FIG. 6, in the beam-column joint portion 30, the column main reinforcement 31 and the beam main reinforcement 32, which are linearly formed, are joined to the outer surfaces of the flanges 4a and 8a of the column steel frame 4 and the beam steel frame 8, respectively. It is fixed at a position before the part 7.

The column main bar 31 and the beam main bar 32 are fixed by embedding the end parts 31a, 32a on the joint 7 side in a supporting concrete 33 installed so as to project from the outer surfaces of the flanges 4a, 8a. Are flanges 4a, 8
It is arranged substantially parallel to a. The supporting concrete 33 is attached to the outer surfaces of the flanges 4a and 8a via an iron plate 34 welded in front of the joint 7. The iron plate 34 has a roughened outer surface and a rough surface, and when the support concrete 33 is cast on this surface, the tension of the column main bars 31 and the beam main bars 32 transmitted through the support concrete 33 is pulled. Power can be supported.

The pillar-beam joint 30 is constructed as follows by the pre-assembled reinforcing bar construction method for the steel frame reinforced concrete structure of this embodiment.

First, the iron plate 34 is welded and fixed to the outer surfaces of the flanges 4a and 8a in front of the joint 7 at the factory. Next, after fixing the ends of the column main bars 31 and the beam main bars 32 on the opposite side to the joints 7, the whole joints 7 are made substantially tensioned.
The side ends 31a and 32a are located at the fixed position. Then, by placing the supporting concrete 33 while maintaining the above position, the end portions 31 of the column main bar 31 and the beam main bar 32 are
a and 32a are fixed.

After the supporting concrete 33 develops strength, the column shear reinforcements 6 and the beam shear reinforcements 10 are attached to the column main reinforcements 31 and the beam main reinforcements 32 in the same manner as in the first embodiment.
Hereinafter, the beam-column joint portion 30 is constructed in the same manner as in the first embodiment.

According to the pre-assembled reinforcing bar construction method in the steel frame reinforced concrete structure of the present embodiment, the tensile force acting on the column main bar 31 and the beam main bar 32 is transmitted to the flanges 4a, 8a via the supporting concrete 33 and the iron plate 34. Therefore, a large area for supporting the pulling force can be taken, and the supporting force for the pull of the column main bar 31 and the beam main bar 32 is improved. As a result, since the column shear reinforcing bar 6 and the beam shear reinforcing bar 10 to be attached to the column main bar 31 and the beam main bar 32 can be arranged by a high strength arrangement method,
The strength of the beam-column joint portion 30 can be improved.

[0036]

As described above, according to the pre-assembled reinforcing bar construction method for the steel frame reinforced concrete structure of the present invention, the column main bars and the beam main bars are fixed to the column steel frames and the beam steel frames in advance, and the column main bars and the beam main bars are provided. A step of arranging shear reinforcements around the column in the form of winding column reinforcements and beam reinforcements to preassemble the steel frames and reinforcements of the columns and beams, and the columns where the arrangement of each reinforcement and shear reinforcement is completed The method comprises the steps of erection of a steel frame and beam steel frame, and, after the completion of the erection process, a step of attaching a form to the column steel frame and the beam steel frame and placing concrete to complete the column and the beam. The main method of fixing the main beam is the pillar,
Since the end of each main bar is fixed to the column steel frame and the flange of the beam steel frame by welding, screw type or lap joint at a position before the beam joint, the column steel frame and the beam steel frame In addition to simplifying the arrangement of reinforcing bars in the joint to improve work efficiency, it is possible to fix them without inserting them into the joints of columns and beams, simplifying the joints of reinforcing bars in the joints and designing the building. The degree of freedom of is improved. Further, as a result, it becomes easy to design the building to improve its strength.

[Brief description of drawings]

FIG. 1 is an overall view showing a first embodiment of the present invention.

FIG. 2 is the plan view.

FIG. 3 is an enlarged side view showing how the column main bars and the beam main bars are attached to the column steel frame and the beam steel frame.

FIG. 4 is an enlarged side view showing the attachment of the column main bar and the beam main bar to the column steel frame and the beam steel frame of the second embodiment of the present invention.

FIG. 5 is the enlarged plan view.

FIG. 6 is an enlarged plan view showing attachment of a column main bar and a beam main bar to a column steel frame and a beam steel frame of a third embodiment of the present invention.

[Explanation of symbols]

 2 columns 3 beams 4 columns steel frames 4a flanges 5 column main bars 5a ends 6 column shear reinforcement bars 7 joints 8 beam steel frames 8a flanges 9 beam main bars 9a ends 10 beam shear reinforcement bars 21 column main bars 21a ends 22 beam main bars 22a End part 31 Column main reinforcement 31a End part 32 Beam main reinforcement 32a End part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuo Jinno 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Hitoshi Kumagai 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Within the corporation

Claims (1)

Claims: 1. A column main bar and a beam main bar are preliminarily fixed to a column steel beam and a beam steel frame, and a shear reinforcing bar is wound around the column main bar and the beam main bar in the form of winding the column main bar and the beam main bar. Arranging and pre-assembling the steel frames and reinforcing bars of columns and beams; building the pillar steel beams and beam steel frames in which the respective main bars and shear reinforcing bars have been installed; and completing the erection step After that, a process of attaching a formwork to the column steel frame and the beam steel frame, placing concrete, and completing the column and the beam, the method of fixing the column main bar and the beam main bar is as follows: At the position, the end of each main bar is fixed to the flange of the column steel frame and the beam steel frame by welding, screw type or lap joint, etc., and the pre-assembled reinforcing bar construction method in the steel frame reinforced concrete structure is characterized.