JP4358453B2 - Anchoring method of column main reinforcement in reinforced concrete columns - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for fixing a column main reinforcing bar in a reinforced concrete column.
[0002]
[Prior art]
Conventionally, when connecting a column and a beam on the top floor or the roof of a reinforced concrete building, the upper end of the column main reinforcing bar in the reinforced concrete column is bent into a J shape or manufactured separately as a J or U shape. Fixing strength to concrete was secured by fixing the shaped reinforcing bars as lap joints. In addition, there has been a method of improving the fixing force by attaching a fixing plate to the upper end portion of the column main reinforcing bar.
[0003]
[Problems to be solved by the invention]
However, in the conventional method of fixing the main column reinforcement by bending it into a J-shape, more than the number of column main reinforcements originally used in the column-beam joint is arranged in a complicated manner. There was a problem that the muscle work was difficult and time-consuming.
[0004]
In addition, in the method of fixing the J-shaped or U-shaped overlapping joints to the column main reinforcing bars, when the column main reinforcement is placed, the concrete of the column has already reached the lower surface of the beam. Since it is placed, the lap joint reinforcement cannot be fixed to the concrete below the beam-to-column joint, so that the required length of the lap joint reinforcement cannot be secured.
[0005]
Therefore, in this case, the top floor slab was provided with a concrete protrusion located on the upper side of the column, and the length required for fixing was ensured by burying a lap joint line in this protrusion. As design restrictions increase, it takes time and effort to provide the protrusions, and when the waterproof sheet is pasted on the roof, the protrusions may interfere with waterproofing, which may result in incomplete waterproofing.
[0006]
In addition, the fixing method of attaching the fixing plate to the column main reinforcing bars improves the fixing force in the pulling direction of the column main reinforcing bars, but when a large pulling force acts on the column main reinforcing bars, as described below, In other words, if a large pulling force acts on the column main reinforcement, a large bearing pressure is generated between the anchor plate and the concrete, but it is usually more than the bearing strength of the concrete inside the column. Since the bearing strength of the outer concrete is weaker, the bearing plate generated between the fixing plate and the concrete is pushed out to the outside where the bearing strength is lower, and the concrete is destroyed.
[0007]
The object of the present invention is to solve such problems, and it is possible to reliably fix the column main reinforcing bars and to facilitate the reinforcement work of the beam main reinforcing bars. It is a technical problem to provide a fixing method.
[0008]
[Means for Solving the Problems]
The present invention is a method of fixing a column main reinforcing bar in a reinforced concrete column, and is configured as follows in order to solve the above technical problem. That is, the present invention attaches a fixing member protruding laterally from the column main reinforcing bar to the plurality of column main reinforcing bars of the reinforced concrete column, and the column mains arranged on the outer peripheral side among the plurality of column main reinforcing bars. A hoop bar located in the vicinity of the fixing member is arranged so as to restrain the reinforcing bar.
[0009]
Further, the present invention provides the column main reinforcing bar provided along a surface to which the beam is not joined when a beam is joined to a part of the side surfaces of the reinforced concrete column and the beam is not joined to the remaining side surface. Of these, the sub-hoop bars are arranged so as to restrain at least a part of the column main reinforcing bars excluding both ends.
[0010]
According to the present invention, the fixing force in the pulling direction of the column main reinforcing bars is increased by the fixing member, and the plurality of column main reinforcing bars arranged on the outer peripheral side of the column are constrained by the hoop reinforcing bars, thereby the column main reinforcing bars. Fixing power in the horizontal direction of
[0011]
In addition, in order to constrain at least a part of the column main reinforcing bars arranged along the surface without the beam, when a sub-hoop reinforcement is arranged, a lateral force is applied toward the surface without the beam. However, the column main reinforcing bars can be prevented from jumping out.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a fixing method of a column main reinforcing bar at an end of a reinforced concrete column according to the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a view for explaining a fixing method of column main reinforcing bars in a reinforced concrete column according to the present invention. This Embodiment demonstrates the case where the reinforced concrete beam 2 is joined to the both sides | surfaces of the reinforced concrete pillar 1 in the top floor or the roof of a reinforced concrete building.
[0014]
The column 1 and the beam 2 each have concrete 10 and a plurality of column main reinforcing bars 11 and beam main reinforcing bars 12 arranged in the concrete 10. These column main reinforcing bars 11 and beam main reinforcing bars 12 are threaded reinforcing bars which are deformed reinforcing bars in order to improve the degree of fixation with concrete 10. The column main reinforcement 11 is extended to the vicinity of the upper end surface 13 of the column 1. Further, the main beam reinforcing bars 12 and 12 of the beams 2 on both sides are inserted into the column 1 and coupled.
[0015]
As shown in FIG. 2, a circular fixing member 14 is attached to the upper end of the column main reinforcing bar 11 so as to be inserted therethrough. The fixing member 14 has such a size that a sufficient fixing force can be exerted with respect to the force in the pulling direction acting on the column main rebar 11, and protrudes to the side of the column main rebar 11 by an appropriate length. The fixing member 14 is fixed so as to be sandwiched between two nuts 15 screwed into the column main reinforcing bars 11.
[0016]
Further, in order to restrain the plurality of column main reinforcing bars 11, 11... Provided on the outer peripheral side of the column 1, as shown in FIG. 3, the fixing member 14 is fixed in the vicinity of the fixing member 14, in this embodiment. Hoop bars 16, 16 are arranged directly above and below the upper and lower nuts 15, 15. A large number of these hoop bars 16 are provided at appropriate intervals over the entire length of the column main reinforcing bars 11.
[0017]
Further, among the column main reinforcing bars 11 provided along the side surfaces 17 and 17 where the beam 2 of the column 1 is not joined, at least a part of the column main reinforcing bars 11 excluding the column main reinforcing bars 11 on both sides is constrained. Therefore, the sub hoop muscle 18 is arranged. In the present embodiment, sub hoop bars 18 are arranged in the column main reinforcing bars 11, 11 at the center of the side surface 17.
[0018]
The sub hoop line 18 is arranged so as to overlap the hoop line 16 described above. Which column main reinforcing bar 11 the sub hoop reinforcement 18 is arranged to is appropriately determined according to various conditions such as a use environment and a load application state.
[0019]
Further, in the present embodiment, the sub hoop bars 18 are also arranged in the column main reinforcing bars 11 and 11 except for both ends of the column main reinforcing bars 11 provided along the surface 19 to which the beam 2 of the column 1 is joined. Has been. In addition, hoop bars 20 and 21 and a U-shaped cage bar 22 are arranged in the beam main reinforcing bar 12 of the beam 2.
[0020]
Thus, according to the fixing method of the column main reinforcement in the reinforced concrete column of the present invention, the column main reinforcement 11 of the reinforced concrete column 1 is provided with the fixing member 14 projecting sideways, and the outer peripheral side of the column 1 Since the hoop bars 16 located in the vicinity of the fixing member 14 are arranged in the plurality of column main reinforcing bars 11 arranged in the vertical direction, the fixing member 14 improves the fixing force in the pulling direction of the column main reinforcing bars 11. The fixing force in the lateral direction is increased by the hoop line 16. Therefore, even when a force in any direction is applied to the column beam joint during an earthquake, the column main rebar 11 can be reliably fixed.
[0021]
Further, among the plurality of column main reinforcing bars 11 arranged along the surface 17 where the beam 2 of the column 1 is not joined, the sub-hoop bars 18 are arranged in some column main reinforcing bars 11 and 11 except for both sides. Therefore, even when a pulling force is applied to the column main reinforcing bar 11, it is possible to prevent the column main reinforcing bar 11 and the fixing member 14 from jumping out to the outside where the bearing strength is weak and destroying the concrete 10.
[0022]
Furthermore, by improving the fixing force of the column main reinforcing bar 11, it is not necessary to bend the upper end portion of the column main reinforcing bar 11 into a J shape or attach a J-shaped or U-shaped joint bar as in the prior art. Therefore, since the bar arrangement structure of the column beam joint is simplified, the bar arrangement work of the beam main reinforcement 12 is facilitated. Further, even when the pillar 1 is placed in advance, the fixing force of the column main reinforcing bars 11 can be secured.
[0023]
In addition, since the fixing force of the column main reinforcing bars 11 is ensured, it is not necessary to provide a protrusion on the upper side of the column 1 as in the prior art. It can be done reliably.
[0024]
In the above-described embodiment, the case where the beam 2 is joined to the two opposite side surfaces of the column 1 has been described. However, the present invention can be applied to the case where the beam 2 is joined to the three side surfaces of the column 1 or as shown in FIG. In addition, the present invention can be applied to the case where the beam 2 is joined to all the side surfaces of the column 1.
[0025]
Further, in the above-described embodiment, screw fixing bars are used for the column main reinforcing bars 11, and the fixing member 14 is fixed by the nuts 15 and 15 screwed into the screw fixing bars. However, the fixing member 14 and the nut 15 are integrated. Or, a normal reinforcing bar can be used as the column main reinforcing bar 11, or the fixing member 14 can be fixed to the column main reinforcing bar 11 by welding.
[0026]
【The invention's effect】
As described above, according to the present invention, the fixing member improves the fixing force in the pulling direction of the column main reinforcement, and the hoop reinforcement arranged in the vicinity of the fixing member fixes the column main reinforcement in the lateral direction. Power is improved.
[0027]
Therefore, unlike the conventional case, it is not necessary to bend the end of the column main reinforcing bar into a J-shape or to attach a J-shaped or U-shaped joint, so the bar arrangement structure of the column beam joint is not necessary. It can be simplified, and the reinforcement work of the beam main reinforcement becomes easy. Moreover, since the length of the fixing portion is not so long, the fixing force of the column main reinforcing bar can be secured even when the column is placed in advance.
[0028]
Moreover, since it is not necessary to provide a protrusion for fixing the column main reinforcing bar on the upper side of the column as in the conventional case, the work of attaching a waterproof sheet to the roof becomes easy, and the roof waterproofing can be reliably performed. .
[0029]
Further, when sub-hoop bars are arranged on at least a part of the column main reinforcing bars provided along the surfaces where the column beams are not joined, these column main reinforcing bars are constrained to improve the fixing force. Therefore, even when a lateral force acts on the column main reinforcement, it is possible to prevent the column main reinforcement from jumping to the outside where the bearing strength is weak and destroying the concrete.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view for explaining a fixing method of column main reinforcing bars in a reinforced concrete column according to the present invention.
FIG. 2 is a perspective view showing a fixing member according to the present invention.
FIG. 3 is a view taken in the direction of arrow A in FIG.
FIG. 4 is a cross-sectional view showing another embodiment of a fixing method for column main reinforcing bars in a reinforced concrete column according to the present invention.
[Explanation of symbols]
1 Column 2 Beam 11 Column Main Rebar 14 Fixing Member 16 Hoop Reinforce 18 Sub-Hoop Reinforcement

Claims (2)

A fixing member that protrudes laterally from the column main reinforcing bar is attached to the end of the plurality of column main reinforcing bars of the reinforced concrete column and the end to which the beam is joined ,
Arranging hoop bars so as to restrain the column main reinforcing bars arranged on the outer peripheral side among the plurality of column main reinforcing bars ,
At the end of the column main reinforcing bar, a hoop bar is arranged near the fixing member attached to the end so that the fixing member is sandwiched between two hoop bars in the longitudinal direction of the column main reinforcing bar. The fixing method of the column main reinforcement in the reinforced concrete column characterized by the above-mentioned.   When a beam is bonded to a part of the side surfaces of the reinforced concrete column and a beam is not bonded to the remaining side surface, both ends of the column main reinforcing bars provided along the surface to which the beam is not bonded are excluded. 2. The fixing method for column main reinforcing bars in a reinforced concrete column according to claim 1, wherein sub hoop bars are arranged so as to constrain at least a part of the column main reinforcing bars.

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