JPH0578705U - Mixed structure of columns and beams - Google Patents

Abstract

(57) [Abstract] [Purpose] By devising the cross-sectional shape of the hollow cylindrical PC column formwork, the weight at the time of construction can be stably supported by this PC column formwork, and thus an erection structure close to a steel frame structure can be achieved. Pillars that enable
Providing a mixed structure of beams. [Structure] The pillar 10 is constructed as an RC structure using a hollow cylindrical PC pillar formwork 12. The beam 16 is constructed as an S structure with I-shaped steel having parallel flanges 16a formed at both upper and lower ends. A steel pipe 18 surrounding the outer periphery of the pillar 10 is attached to the portion of the PC pillar formwork 12 to which the beam 16 is joined. Steel pipe 18
The diaphragms 20 are fixedly provided at both ends of the diaphragms corresponding to the flanges 16a. The end of the flange 16a is welded to the outer peripheral portion of the diaphragm 20. The cross-sectional shape of the PC column form 12 is formed in a square shape on the outside and a circular shape on the inside. The diaphragm 20 has a quadrangular shape on the outer side and a circular shape on the inner side along the cross-sectional shape of the PC column frame 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a column / beam mixed structure including a column having a reinforced concrete structure using a hollow cylindrical PC column formwork and a beam having a steel frame structure.

[0002]

[Prior Art]

 Conventionally, as a frame structure of a building, for example, there is a mixed structure using RC (reinforced concrete) columns and S (steel frame) beams as disclosed in Japanese Utility Model Publication No. 61-34404 (E04B 1/30). The S beam is made of I-shaped steel having upper and lower flanges, and the I-shaped steel is joined to a square steel pipe embedded in an RC column.

By the way, in order to construct the RC column, as disclosed in Japanese Patent Laid-Open No. 2-80205 (B28B 21/56) in recent years, a column form made by precasting concrete into a hollow cylindrical body (hereinafter , PC column formwork) has come to be used. In other words, the PC pillar formwork can be easily manufactured by bringing it into the site by building it in a factory etc. and then arranging the concrete in the installed PC pillar formwork and placing concrete. RC columns can be constructed.

[0004]

[Problems to be solved by the device]

 However, in such a conventional column / beam mixed structure, when the RC column is constructed by using a PC column form, the PC column form is formed so that the wall thickness is substantially constant over the entire circumference. Moreover, the thickness of the PC pillar formwork is reduced for the purpose of weight reduction.

Therefore, in the mixed structure of RC pillars and S beams using the PC pillar formwork, the strength of the PC pillar formwork itself is not so large that when the pillars and beams are installed during temporary construction. In addition, as in the RC structure, the construction is performed in one-layer units, and even if the beam is steel, it cannot be constructed in a steel-frame-like construction, that is, in multiple-layer units. On the other hand, there is a problem that simply increasing the wall thickness to secure the strength of the PC column formwork is not preferable because it reduces the effectiveness of the column reinforcement. In particular, focusing on obtaining the hollow columnar body having a rectangular inner / outer cross-section disclosed in Japanese Patent Laid-Open No. 2-80205, in order to do so, at the positions corresponding to the inner four corners. It was necessary to install some formwork, such as a rod, to manufacture it.

In view of such conventional problems, the present invention devises the cross-sectional shape of the PC pillar formwork to stably support the weight at the time of temporary installation by the PC pillar formwork, thereby providing a steel structure. The purpose is to provide a mixed structure of columns and beams that enables close construction.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a column-beam mixed structure including a column of a reinforced concrete structure using a hollow cylindrical PC column formwork and a beam of a steel frame structure having a flange formed therein. A reinforcing steel material in which the cross-sectional shape of the PC pillar formwork has a quadrangular shape on the outside and a circular shape on the inner side and surrounds the outer circumference of the PC pillar formwork at the portion to which the beam of the PC pillar formwork is joined. And a diaphragm having a square outer shape and a circular inner shape along the cross-sectional shape of the PC column form is provided at a position corresponding to the flange of the reinforcing steel.

[0008]

[Action]

 In the column / beam mixed structure of the present invention having the above-described configuration, since the hollow cylindrical PC column formwork has a quadrangular cross-sectional shape on the outside and a circular cross-section on the inside, the PC column It is possible to form thick wall portions at the four corners of the mold. Therefore, it is possible to remarkably increase the strength of the PC column form by the thickened portions of the four corners without significantly increasing the weight of the PC column form. Therefore, when assembling the PC pillar formwork and the beam, the PC pillar formwork can stably support a large weight at the time of temporary installation.

Further, in assembling the PC pillar formwork and the beam, a steel beam can be coupled to the reinforcing steel material surrounding the outer periphery of the PC pillar formwork. That is, by welding the flange of the beam to the diaphragm provided on the reinforcing steel material, it is possible to reliably connect the beams. At this time, the diaphragm was formed in a quadrangular shape on the outer side and a circular shape on the inner side along the cross-sectional shape of the PC pillar formwork, so that the strength of the diaphragm was remarkably increased, which in turn extended the PC pillar formwork and the steel frame. The connection with the beam can be reliably performed.

Therefore, according to the present invention, the strength of the PC pillar formwork itself can be ensured and the connection with the steel beam can be surely performed, so that the building structure is constructed using the PC pillar formwork and the steel frame beam. When building, it is possible to build multiple layers at once.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 3 show an embodiment of a mixed structure of columns and beams according to the present invention, FIG. 1 is a side sectional view of an essential part, FIG. 2 is a sectional view taken along line AA in FIG. 2 is a sectional view taken along line BB in FIG. 1.

That is, in the mixed column / beam structure of the present embodiment, as shown in FIG. 1, the column 10 is constructed as a reinforced concrete structure using a hollow cylindrical PC column form 12. The RC pillar 10 is constructed by placing the PC pillar formwork 12 in a portion where the pillar 10 is to be constructed, and arranging the reinforcement 14 in the hollow portion of the PC pillar formwork 12 and then placing concrete. To be done. Since the PC column mold 12 is formed by centrifugal force by rotating the mold while placing concrete in the mold placed sideways, the PC column mold 12 is It is possible to reliably fill the lower end with concrete, and to transmit the column axial force sufficiently.

Further, the beams 16 are connected to each other in the height direction of the RC column 10 with a required space (one floor). The beam 16 is constructed as a steel frame structure by I-shaped steel having parallel flanges 16a formed at both upper and lower ends.

A steel pipe 18 as a reinforcing steel material that surrounds the outer periphery of the column 10 is attached to the portion where the beam 16 is joined to the PC column form 12. The steel pipe 18 is formed to have a length substantially equal to the height of the beam 16, and diaphragms 20 are fixedly attached to both ends of the steel pipe 18 corresponding to the flanges 16a. Then, when the beam 16 is coupled to the column 10, the end of the flange 16 a of the beam 16 is welded to the outer peripheral portion of the diaphragm 20. A connecting gusset plate 22 is welded to the outside of the steel pipe 18, and the connecting gusset plate 22 is fixed to the web 16b of the beam 16 via bolts and nuts (not shown).

Here, in the present embodiment, as shown in FIG. 2, the cross-sectional shape of the PC column form 12 is formed in a square quadrangular shape on the outer side and a circular shape on the inner side. A reinforcing bar 24 is embedded in the PC column form 12 in advance. Further, as shown in FIG. 3, the diaphragm 20 has a quadrangular shape on the outer side and a circular shape on the inner side along the sectional shape of the PC column form 12.

In the composite structure of pillars and beams according to the present embodiment having the above-described configuration, the RC pillar 10 is constructed using the PC pillar formwork 12, so the construction work of the RC pillar 10 is simplified. , The construction period can be shortened while achieving the reduction of construction cost. By the way, since the cross-sectional shape of the PC column form 12 is quadrangular on the outside and circular on the inside, it is possible to form thick portions 12a at the four corners of the PC column form 12, Unlike the conventional example, the inner formwork is no longer needed, and the mounting and removal of this formwork can be omitted. Further, the PC pillar formwork 12 can remarkably increase the strength of the PC pillar formwork 12 by the thickened portions 12a of the four corners, and the increase amount of weight with respect to the strength of the PC pillar formwork 12 is set to be small. can do. Therefore, when assembling the beam 16 using the PC pillar formwork 12, it is possible to stably support a large weight during temporary installation while suppressing an increase in the weight of the PC pillar formwork 12 itself.

By the way, the beam 16 formed of I-shaped steel is attached to a steel pipe 18 surrounding the outer periphery of the PC column form 12, and the column 10 and the beam 16 are assembled. The beam 16 is attached by welding to the outer periphery of a diaphragm 20 fixed to both ends of the steel pipe 18, and bolts and nuts are fixed to the web 16b of the beam 16 via a connecting gusset plate 22. At this time, since the diaphragm 20 is formed in a quadrangular shape on the outside and a circular shape on the inside along the cross-sectional shape of the PC column form 12, the strength of the diaphragm 20 is remarkably increased, and the PC column is extended. The formwork 12 and the beam 16 can be reliably coupled.

As described above, in this embodiment, the strength of the PC column formwork 12 itself is increased and the S beam 16 can be securely attached to the PC column formwork 12 through the steel pipe 18. The PC column form 12 can stably support the weight during assembly. Therefore, when a building is constructed using the PC pillar formwork 12 and the S-beam 16, it is possible to construct a plurality of layers at once, and a construction substantially similar to a steel structure is possible.

[0019]

[Effect of the device]

 As described above, in the mixed column / beam structure of the present invention, a reinforced concrete column is constructed using a hollow cylindrical PC column formwork, and the cross-sectional shape of this PC column formwork is Since the outer side has a quadrangular shape and the inner side has a circular shape, it is possible to remarkably increase the strength by forming thickened portions at the four corners of the PC pillar formwork, and the inner formwork is not required. In addition, the steel structure beam is designed to be joined to the reinforcing steel material that surrounds the outer periphery of the PC column formwork, and the diaphragm that welds the flange of this beam is squared outside along the cross-sectional shape of the PC column formwork. Since the inner shape is circular, the strength of the diaphragm can be remarkably increased, and the PC column form and the steel beam can be reliably connected. Therefore, it is possible to secure the strength of the PC pillar formwork itself, to stably support a large weight at the time of construction, and to securely connect it to the steel beam. Similar to the structure, it is possible to build multiple layers at once when building a building. For this reason, the construction work can be efficiently performed, and the construction period can be shortened, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1 showing an embodiment of the present invention.

FIG. 3 is a sectional view taken along line BB in FIG. 1 showing an embodiment of the present invention.

[Explanation of symbols]

10 Pillars 12 Hollow Cylindrical PC Column Formwork 16 Beams 16a Flange 18 Steel Pipe (Reinforced Steel Material) 20 Diaphragm

Claims (1)

[Scope of utility model registration request] 1. A column-beam mixed structure comprising a column of a reinforced concrete structure using a hollow cylindrical PC column formwork and a beam of a steel frame structure having a flange formed therein, wherein a cross section of the PC column formwork The shape is a square shape on the outside and a circular shape on the inside, and a reinforcing steel material surrounding the outer periphery of the PC pillar formwork is attached to the portion of the PC pillar formwork to which the beam is joined, and this reinforcing steel material A column-beam mixed structure, characterized in that a diaphragm having a quadrangular shape on the outside and a circular shape on the inside is provided along the cross-sectional shape of the PC column form at a position corresponding to the flange.