JP2009108631A - Beam-column joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a beam-column joint structure which can maintain a positional relationship between a steel-frame beam and a reinforced concrete column over a long period of time. <P>SOLUTION: A support steel pipe 10 is provided around the reinforced concrete column 86 in such a manner as to surround the column 86. A gap d1 is provided between an inner peripheral surface 10N of the support steel pipe 10 and an outer peripheral surface 86F of the column 86, and filled with a grout material 12; and the support steel pipe 10 is joined to the column 86. A joint steel pipe 80 is provided on the support steel pipe 10; a gap d2 is provided between an inner peripheral surface 80N of the joint steel pipe 80 and the outer peripheral surface 86F of the column 86; and a cotter 90 is provided on the outer peripheral surface 86F covered with the joint steel pipe 80. The gap d2 and the cotter 90 are filled with a grout material 88; and the joint steel pipe 80 is joined to the column 86. A beam 82 is joined to the joint steel pipe 80, and a gap S is provided between the joint steel pipe 80 and the support steel pipe 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a column beam joining structure in which a steel beam is joined to a joining steel pipe provided on a reinforced concrete column.

Conventionally, a steel beam and a reinforced concrete column are joined by using a joined steel pipe provided on the column.
At this time, as shown in FIG. 4, the outer peripheral surface 80F of the joining steel pipe 80 provided on the column 86 made of reinforced concrete and the end face of the steel beam 82 are joined by welding. Further, the outer peripheral surface 80 </ b> F of the bonded steel pipe 80 and the end of the beam 82 are bolted by a plate 92.

  Further, the joining steel pipe 80 and the reinforced concrete column 86 are joined by filling the gap d2 between the inner peripheral portion 80N of the joining steel pipe 80 and the outer peripheral portion 86F of the column 86 with the grout material 88 and bonding them with the grout material 88. ing. At this time, in order to increase the adhesive force of the grout material 88, a cotter 90, which is a circumferential groove, is provided in a range covered with the joining steel pipe 80 on the outer peripheral surface 86F of the column 86.

  However, when the beam 82 is joined to the joining steel pipe 80 by welding after the grout material 88 is filled, the grout material 88 may be deteriorated by heating during welding, and the adhesive force may be reduced. In addition, the joining steel pipe 80 may be subjected to repeated deformation force due to the earthquake, and the joining steel pipe 80 may be deformed to reduce the adhesion force of the grout material 88. In such a case, the joining steel pipe 80 may not be able to support the beam 82 in some cases.

For this reason, there are several proposals as a more reliable method for joining the column and the beam (see Patent Documents 1 and 2).
However, as shown in FIG. 5, Patent Document 1 has a configuration in which a joining ring 2 joined to a beam 9 is supported by a ring 10 provided on the column 1, and the ring 10 is welded to the outer peripheral portion of the column 1. It is joined. For this reason, the surface of the pillar 1 must be made of iron and cannot be applied to a concrete pillar.

Further, in Patent Document 2, as shown in FIG. 6, a bonded steel pipe 19 joined to the beam 22 is placed on the support plate 16. The support plate 16 is joined to the steel pipe 20, and a part of the steel pipe 20 is embedded in a column 13 made of reinforced concrete. For this reason, the steel pipe 20 cannot be embedded unless it is a column made of newly reinforced concrete.
Japanese Patent Application Laid-Open No. 5-214736 JP 2002-235375 A

  In consideration of such facts, the present invention can maintain the positional relationship between a steel beam and a reinforced concrete column over a long period of time regardless of deterioration of the grout material due to heating during welding or deformation of the bonded steel pipe due to an earthquake. It is an object of the present invention to provide a joint structure of column beams.

  The column beam connection structure according to the first aspect of the present invention is a column beam connection structure in which a steel beam and a reinforced concrete column are bonded via a bonded steel pipe, and is bonded to the outer peripheral surface of the column. And a supporting steel pipe for supporting the joining steel pipe.

In the first aspect of the present invention, the joining steel pipe provided on the reinforced concrete column is supported by the supporting steel pipe.
The supporting steel pipe is formed of a steel pipe different from the joining steel pipe, and is joined to the outer peripheral surface of the reinforced concrete column. Further, the supporting steel pipe is not joined to the joining steel pipe or the beam. As a result, even if the bonded steel pipe or beam is deformed by a force such as an earthquake, the supporting steel pipe is not affected, and the connection between the column and the supporting steel pipe is stably maintained.

  For this reason, for example, due to degradation of grout due to heating during welding to the beam, thermal expansion of the bonded steel pipe, swelling of the bonded steel pipe due to tension of the beam, damage to the grout due to repeated application of rotational force to the bonded steel pipe, etc. Even if the joining force between the column and the joining steel pipe decreases and tries to move downward, it is supported by the supporting steel pipe, so that the positional relationship between the joining steel pipe and the beam can be maintained.

  Moreover, if a support steel pipe is first joined to a column and used for positioning at the time of joining of the joined steel pipe, the workability of grout joining is improved. At this time, the welding operation with the beam can be performed in a state where the steel pipe is positioned with the support steel pipe, and the deterioration of the grout can be prevented.

  In addition, when the bonded steel pipe is grout bonded and then welded to the beam, the bonded steel pipe is supported by the supporting steel pipe, so that the allowable range of degradation of the grout adhesion at the joint can be increased. This makes it easy to manage the heating temperature during welding.

According to a second aspect of the present invention, in the column beam connection structure according to the first aspect, a gap is formed between the bonded steel pipe and the support steel pipe.
Thereby, a contact with a joining steel pipe and a support steel pipe can be eliminated. As a result, it is possible to prevent damage to the joint portion of the support steel pipe caused by contact with the joined steel pipe.

The invention according to claim 3 is the column beam connection structure according to claim 1, wherein either the outer peripheral surface of the column to which the support steel pipe is bonded or the inner peripheral surface of the support steel pipe is A cotter filled with an adhesive or grout is formed.
In the invention according to claim 3, the cotter is formed on either the outer peripheral surface of the column to which the support steel pipe is joined or the inner peripheral surface of the support steel pipe, and the cotter is filled with an adhesive or grout.
Thereby, the support steel pipe is firmly joined to the column.

  Since the present invention is configured as described above, the positional relationship between the steel beam and the reinforced concrete column can be maintained for a long period of time regardless of deterioration of the grout material due to heating during welding, deformation of the bonded steel pipe due to an earthquake, or the like.

(First embodiment)
As shown in FIG. 1, a cylindrical support steel pipe 10 is provided at a predetermined position of a reinforced concrete column 86 so as to surround the column 86.
A gap d <b> 1 is provided between the inner peripheral surface 10 </ b> N of the support steel pipe 10 and the outer peripheral face 86 </ b> F of the column 86. The gap d <b> 1 is filled with the grout material 12, and the support steel pipe 10 is joined to the column 86.

  On the support steel pipe 10, a joining steel pipe 80 is provided so as to surround the column 86. The bonded steel pipe 80 is the same as that described in the prior art. That is, a gap d2 is provided between the inner peripheral surface 80N of the bonded steel pipe 80 and the outer peripheral surface 86F of the column 86, and the outer peripheral surface 86F of the column 86 covered with the bonded steel pipe 80 is provided with a circumferential groove. A cotter 90 is provided. The gap d2 and the cotter 90 are filled with a grout material 88, and the joining steel pipe 80 is joined to the column 86.

A steel beam 82 is joined to the outer peripheral surface 80 </ b> F of the joined steel pipe 80 by welding 84. Further, the beam 82 is bolted to the bonded steel pipe 80 by a plate 92.
Further, a gap S is provided between the bonded steel pipe 80 and the support steel pipe 10.

  Thus, the compressive force which the joining steel pipe 80 receives from the beam 82 by forming the supporting steel pipe 10 and the joining steel pipe 80 by another steel pipe, and joining the supporting steel pipe 10 and the joining steel pipe 80 to the column 86 with the gap S therebetween. The support steel pipe 10 is not affected by the tensile force or the like, and the joining of the column 86 and the support steel pipe 10 is stably maintained.

  Thereby, for example, after filling the grout material 88, the beam 82 is welded, and when the grout material 88 deteriorates due to heating at the time of welding and joining, the joining steel pipe 80 receives repeated deformation force due to an earthquake, and the joining steel pipe 80 is Even when the adhesive force between the bonded steel pipe 80 and the column 86 is reduced due to deformation and deformation of the grout material 88, the bonded steel pipe 80 can be received by the support steel pipe 10, and the bonded steel pipe 80 and the beam 82 can be received. Can be maintained.

  Further, if the support steel pipe 10 is joined to a predetermined position before the column 86 is raised, the support steel pipe 10 can be used for positioning when joining the joined steel pipe 80. Thereby, the filling workability of the grout material 88 is improved. At this time, the welded joint 84 between the beam 82 and the joined steel pipe 80 can also be operated in a state where the beam is positioned by the support steel pipe 10, and the grout material 88 can be prevented from being deteriorated.

  Furthermore, when the joining steel pipe 80 is joined with the grout material 88 while the joining steel pipe 80 is supported by the support steel pipe 10, and then the welding joining 84 of the beam 82 is performed, the tolerance of deterioration of the grout material 88 is widened. The heating temperature at the time of welding joining 84 can be easily managed.

  Thereby, the positional relationship between the steel beam 82 and the reinforced concrete column 86 can be maintained over a long period of time regardless of deterioration of the grout material 88 due to heating at the time of welding joining 84 or deformation of the joining steel pipe 80 due to an earthquake.

Here, as the grout material 88, for example, ordinary concrete, high-strength concrete, high-strength mortar, or high-strength mortar containing fibers can be considered. Further, an adhesive may be filled instead of the grout material 88.
Moreover, the clearance gap S between the support steel pipe 10 and the joining steel pipe 80 is good also as a position which makes the clearance gap S small and the support steel pipe 10 and the joining steel pipe 80 contact.

(Second Embodiment)
As shown in FIG. 2, a cylindrical support steel pipe 20 is provided at a predetermined position of the reinforced concrete column 86 so as to surround the column 86.
A gap d1 is opened between the inner peripheral surface 20N of the support steel tube 20 and the outer peripheral surface 86F of the column 86, and the outer surface 86F of the column 86 covered with the support steel tube 20 has a cotter that is a circumferential groove. 26 is provided. The gap d1 and the cotter 26 are filled with the grout material 12, and the indicator steel pipe 20 is joined to the column 86.

  A bonded steel pipe 80 is provided on the support steel pipe 20. The bonded steel pipe 80 is the same as that of the first embodiment. However, the difference is that the cotter 90 is not provided on the outer peripheral surface 86 </ b> F of the column 86 in the bonding of the bonded steel pipe 80 and the column 86.

Further, a gap S is provided between the bonded steel pipe 22 and the support steel pipe 20.
Thus, the support steel pipe 20 can be more strongly joined to the column 86 by adopting a configuration in which the cotter 26 is provided on the outer peripheral surface 86F covered with the support steel pipe 20. Thereby, even if it does not provide the cotter 90 in the outer peripheral surface 86F covered with the joining steel pipe 80, the joining steel pipe 80 can be received with the support steel pipe 20, and the same effect | action and effect as 1st Embodiment can be acquired. it can.

  In addition, although the case where the cotter 26 was provided in the outer peripheral surface 86F of the column 86 covered with the support steel pipe 20 was demonstrated using FIG. 2, the cotter 26 is not provided in the outer peripheral surface 86F of the column 86, and the support steel pipe 20 is provided. The inner peripheral surface 20N may be provided with a cotter (not shown).

Thereby, the support steel pipe 20 can be strongly joined to the column 86, and the same operation and effect as in the first embodiment can be obtained.
(Third embodiment)

In the third embodiment, the support steel pipe 20 is the support steel pipe 20 described in the second embodiment, and the joining steel pipe 80 is the joining steel pipe 80 described in the first embodiment.
That is, as shown in FIG. 3, the support steel pipe 20 is provided at a predetermined position of the column 86 so as to surround the column 86. A cotter 26 is provided on the outer peripheral surface 86 </ b> F of the column 86 covered with the support steel pipe 20.

A joined steel pipe 80 is provided on the support steel pipe 10. The cotter 26 is provided on the outer peripheral surface 86 </ b> F of the column 86 covered with the bonded steel pipe 80.
A gap S is provided between the support steel pipe 10 and the bonded steel pipe 80.

  Thus, by setting it as the structure which provides a cotter in both the support steel pipe 20 and the joining steel pipe 80, the joining strength with the pillar 86 can be strengthened more, and it is the same effect | action demonstrated in 1st Embodiment. , You can get the effect.

It is a figure which shows the joining structure of the column beam which concerns on the 1st Embodiment of this invention. It is a figure which shows the joining structure of the column beam which concerns on the 2nd Embodiment of this invention. It is a figure which shows the joining structure of the column beam which concerns on the 3rd Embodiment of this invention. It is a figure which shows the joining structure of the conventional column beam. It is a figure which shows the joining structure of the conventional column beam. It is a figure which shows the joining structure of the conventional column beam.

Explanation of symbols

10 support steel pipe 12 grout material 20 support steel pipe 20N support steel pipe inner peripheral surface 26 cotter 82 beam 86 reinforced concrete column 80 jointed steel pipe 86F column outer peripheral surface 90 cotter 88 grout material S clearance

Claims (3)

It is a column beam joint structure that joins a steel beam and a reinforced concrete column via a joint steel pipe,
A joining structure of column beams, comprising a supporting steel pipe that is joined to an outer peripheral surface of the pillar and supports the joining steel pipe.   The column beam connection structure according to claim 1, wherein a gap is formed between the bonded steel pipe and the supporting steel pipe.   2. A cotter filled with an adhesive or a grout material is formed on at least one of an outer peripheral surface of the column to which the support steel pipe is joined or an inner peripheral surface of the support steel pipe. Column beam connection structure described in 1.

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