JP3902965B2 - Fixing method of main beam reinforcement at the beam joint of the top floor or the roof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for fixing a main beam reinforcing bar in a column beam joint on a top floor or a roof, suitable for a reinforced concrete structure or a steel reinforced concrete structure.
[0002]
[Prior art]
In the reinforced concrete or steel-framed reinforced concrete building, the beam main reinforcement is placed horizontally at the upper and lower ends of the beam at the top or bottom of the beam-column joint, and the concrete above the beam main reinforcement at the upper end is placed. Since the covering thickness is small, it is impossible to secure the necessary fixing force of the concrete in the horizontal part of the beam main reinforcing bar arranged on the upper end side of the beam as it is.
[0003]
For this reason, conventionally, the end of the beam main reinforcing bar arranged on the upper end side of the beam is bent and joined to the main beam reinforcing bar arranged on the lower end side of the beam to integrate the beam main reinforcing bars on the upper and lower end sides. As a result, the necessary anchorage of the beam main reinforcement at the upper end of the beam was secured.
[0004]
[Problems to be solved by the invention]
However, even if the tip of the beam main reinforcing bar on the upper end side of the beam is bent and joined to the beam main reinforcing bar on the lower end side of the beam as in the conventional case, the fixing force of the horizontal portion of the beam main reinforcing bar on the upper end side is still small. The horizontal part was not recognized as an effective fixing length.
[0005]
Therefore, the beam main reinforcing bar on the upper end side of the beam must be bent downward at its tip side to provide a vertical part, and the fixing force of the entire beam main reinforcing bar must be secured only by the fixing force in this vertical part. It was necessary to lengthen the length.
[0006]
However, in the column beam connection, column main reinforcing bars, beam main reinforcing bars, etc. are concentrated and crowded, and if the vertical part of the beam main reinforcing bar becomes long, the bar arrangement work becomes very difficult.
[0007]
Normally, the column concrete is placed in advance before joining the beams. However, when the vertical part of the beam main reinforcement becomes longer and extends to the inside of the column through the beam-to-column joint, Since the vertical part of the beam main reinforcing bar to be placed after that is buffered in the concrete, the pillar concrete cannot be placed in advance and the process becomes congested and the construction period becomes longer. It was.
[0008]
Furthermore, in order to bend the tip of the beam main reinforcing bar on the upper end side and connect it to the beam main reinforcing bar on the lower end side, a high bar arrangement accuracy is required.
[0009]
In addition, if the length of the beam main reinforcing bar on the upper end becomes longer, it may be necessary to use two regular reinforcing bars and connect them with joints, which further increases the man-hours for bar arrangement and increases costs. There was a problem of becoming.
[0010]
The object of the present invention is to solve such a problem, and the beam at the beam-to-column joint of the reinforced concrete structure or the steel-framed reinforced concrete structure that can increase the fixing force of the beam main reinforcing bar on the upper end side of the beam. It is a technical problem to provide a method for fixing main reinforcing bars.
[0011]
[Means for Solving the Problems]
The present invention is a method for fixing a beam main reinforcing bar in a column beam joint on the top floor or a roof floor, and is configured as follows in order to solve the above technical problem.
That is, the present invention is a method for fixing a beam main reinforcing bar in a column beam joint in the top floor or the roof of a reinforced concrete structure or a steel reinforced concrete structure,
A vertical part extending downward is formed at the end of the beam main reinforcing bar, and a fixing hardware for increasing the fixing force of the concrete is attached in the vicinity of the vertical part of the beam main reinforcing bar horizontally arranged at the upper end side of the beam. A pair of fixing portions extending below the beam main reinforcing bar in the vicinity of the fixing metal hardware and in the vicinity of a vertical portion of the beam main reinforcing bar horizontally arranged on the upper end side of the beam, and these fixing portions A fixing reinforcing bar having a substantially inverted U shape comprising a connecting portion for connecting the fixing reinforcing bars is hooked, and a pair of fixing portions of the fixing reinforcing bar is fixed to the concrete in the column beam joint.
[0013]
According to the present invention, the beam main reinforcing bar arranged on the upper end side of the beam is restrained by the fixing force of the fixing portion of the fixing reinforcing bar extending below the beam main reinforcing bar. Fixing power increases.
[0014]
In addition, a vertical portion extending downward can be formed at the tip of the beam main reinforcing bar, and a fixing hardware and a fixing reinforcing bar can be arranged in the vicinity thereof. In this case, the fixing force of the beam main reinforcing bar can be further increased. .
[0015]
A plurality of fixing reinforcing bars can be hooked on the beam main reinforcing bar at a predetermined interval, thereby further increasing the fixing force.
[0016]
The substantially reinforcing U-shaped fixing reinforcing bars can be hooked to two or more continuous beam main reinforcing bars, or a plurality of fixing reinforcing bars can be hooked to the beam main reinforcing bars at a predetermined interval. . Thereby, the fixing force in the beam main reinforcing bar can be further increased.
[0017]
In addition, the substantially inverted J-shaped fixing reinforcing bar can be hooked to one beam main reinforcing bar, and in this case, the size of the fixing reinforcing bar is changed even when the distance between the beam main reinforcing bars on the upper end side is different. It is possible to cope with this without any problem, and it is possible to reduce the cost of the anchor reinforcement.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for fixing a beam main reinforcing bar in a column beam joint on a top floor or a roof floor according to the present invention will be described below in detail with reference to the drawings.
[0019]
1A is a longitudinal sectional view showing a beam-column joint portion according to the first embodiment of the present invention, FIG. 1B is a sectional view taken along line AA in FIG. 1A, and FIG. 3) is a perspective view showing the fixing hardware according to the present invention, FIG. 4 is a diagram showing the fixing reinforcing bar according to the present invention, and FIG. 5 is another embodiment of the fixing hardware according to the present invention. FIG. 6A is a longitudinal sectional view showing a column beam joint portion of a second embodiment according to the present invention, and FIG. 6B is a view taken in the direction of arrow C in FIG.
(First embodiment)
As shown in FIG. 1 (A), the first embodiment of the present invention is constructed between a column 10 at the corner of the top floor or the roof of a reinforced concrete structure or a steel reinforced concrete structure, and the columns 10 and 10. Fixing hardware for increasing the fixing force of the beam main reinforcing bars 12 and 13 to the horizontal portions 12a and 13a of the beam main reinforcing bars 12 and 13 arranged at the upper and lower ends of the beam 11 at the joint with the beam 11 14 and 14 are attached. Here, threaded reinforcing bars are used for the beam main reinforcing bars 12 and 13.
[0020]
Then, substantially horizontal U-shaped fixing reinforcing bars 15 and 15 are hung on the horizontal parts 12a and 12a in the vicinity of the fixing hardware 14 attached to the beam main reinforcing bar 12 on the upper end side so as to bridge the connecting part 15b. The fixing portions 15a and 15a extending in a direction substantially perpendicular to the connecting portion 15b of the fixing reinforcing bars 15 and 15, in this case, in the substantially vertical direction are fixed to the concrete 16 in the column beam joint. In this embodiment, a total of two fixing reinforcing bars 15, 15, one on each side of the fixing metal 14, are hooked so as to contact the side end surface of the fixing metal 14.
[0021]
Column main reinforcing bars 17, 17... Are arranged on the outer periphery of the column 10. A plurality of shear reinforcement bars 18, 18... Are wound on the outer peripheral side of these column main reinforcing bars 17, 17. Further, the upper ends of the column main reinforcing bars 17, 17... Are straight and not bent, and the fixing hardwares 14, 14.
[0022]
The top ends of the beam main reinforcing bars 12 and 13 on the upper and lower ends of the beam are formed straight like the column main reinforcing bars 17. A shear reinforcement bar (not shown) is wound around the beam main reinforcing bars 12 and 13 outside the column beam joint.
[0023]
As shown in FIG. 1B, the substantially inverted U-shaped fixing reinforcing bar 15 includes a pair of fixing parts 15a and 15a extending below the horizontal part 12a of the beam main reinforcing bar 12, and these fixing parts 15a, It is formed in an inverted U shape comprising a connecting portion 15b that connects the upper ends of 15a. And the connection part 15b is latched so that the horizontal parts 12a and 12a of the two adjacent beam main reinforcing bars 12 and 12 may be crossed.
[0024]
The fixing reinforcing bar 15 has a circular cross section, and the height H of the fixing portions 15 a and 15 a is set to about 30 times the diameter d of the fixing reinforcing bar 15. The height H of the fixing portions 15a and 15a can be set as appropriate according to the specifications of the fixing reinforcing bars 15 and the concrete 16 and the conditions of the use environment, but the fixing reinforcing bars 15 are hooked on the beam main reinforcing bars 12 and 12. At times, the fixing portions 15 a and 15 a are accommodated in the column beam joint portion so as not to extend to the inside of the column 10. Thereby, the concrete of the pillar 10 can be placed in advance of the beam 11.
[0025]
Further, as shown in FIG. 2, the fixing reinforcing bar 15 is hooked to the horizontal portions 12 a and 12 a of the two adjacent beam main reinforcing bars 12 and 12.
[0026]
As shown in FIG. 3, the fixing hardware 14, 14 includes a nut portion 14 a that can be screwed into a thread portion of the beam main reinforcing bars 12, 13, and a collar portion 14 b that is a protrusion provided at an intermediate portion of the nut portion 14 a. And have. The collar portion 14 b protrudes in the diameter direction of the horizontal portion 12 a in the beam main reinforcing bar 12.
[0027]
Thus, according to the present invention, the fixing hardware 14 is attached to the horizontal portion 12 a of the beam main reinforcing bar 12 arranged on the upper end side of the beam 11, and the horizontal portion 12 a in the vicinity of the fixing hardware 14 is substantially inverted U-shaped. Since the fixing fixing bars 15 and 15 are hooked, the horizontal portion 12a is restrained by the fixing force of the fixing portions 15a and 15 of the fixing reinforcing bar 15. As a result, the fixing force of the horizontal portion 12a is increased and the required fixing force is increased. Can be secured.
[0028]
Therefore, it is not necessary to bend the tip of the beam main reinforcing bar 12 to provide a vertical portion as in the prior art, and it is not necessary to connect the beam main reinforcing bars 12 and 13 on the upper and lower ends. The work becomes very easy and the construction cost can be reduced. Furthermore, since the concrete of the column 10 can be placed in advance of the beam 11, it is possible to avoid the process from becoming congested and the work period being lengthened as in the prior art.
[0029]
Further, since the fixing reinforcing bar 15 has a substantially inverted U shape and is hooked so as to cross the horizontal portions 12a, a of the two main beam reinforcing bars 12, the two fixing members 15 are used as one fixing reinforcing bar 15. Since the reinforcing bars 12 and 12 can be restrained, the efficiency of the bar arrangement work is improved.
[0030]
By the way, when a pulling force acts on the beam main reinforcing bar 12 on the upper end side of the beam due to an earthquake or the like, a bearing pressure is generated between the bearing surface in the collar portion 14 b of the fixing hardware 14 and the concrete 16.
[0031]
At this time, since the concrete strength above the horizontal portion 12a of the beam main reinforcement 12 on the upper end side of the beam is relatively weaker than the concrete strength below, it acts on the bearing surface of the fixing hardware 14 attached to the beam main reinforcement 12. Due to the supporting pressure, a force that flips the fixing hardware 14 upwards acts, and there is a risk that the concrete 16a above the horizontal portion 12a of the beam main rebar 12 on the beam upper end side may be destroyed.
[0032]
On the other hand, in the present invention, since the fixing reinforcing bars 15 and 15 are attached to both sides of the fixing metal 14, it is possible to prevent the fixing metal 14 from jumping upward due to the fixing force of the fixing portions 15a and 15a. Thereby, it can prevent that the concrete 16 is destroyed.
[0033]
In the above-described embodiment, one fixing reinforcing bar 15 is arranged on each side of the fixing hardware 14, but three or more fixing reinforcing bars are provided on the horizontal portion 12a of the beam main reinforcing bar 12 as necessary. 15, 15... Can be arranged at predetermined intervals, whereby the fixing effect of the horizontal portion 12 a can be further increased.
[0034]
In the above-described embodiment, the fixing reinforcing bar 15 is formed in a substantially inverted U shape, and the connecting portion 15b is arranged so as to cross the horizontal portions 12a, 12a of the two main beam reinforcing bars 12, 12. However, as shown in FIG. 4, a substantially inverted J-shaped fixing reinforcing bar 21 having a fixing portion 21a and a latching portion 21b provided at the upper end thereof can also be used.
[0035]
This substantially inverted J-shaped fixing reinforcing bar 21 hooks the hooking portion 21 b to the horizontal portion 12 a of one beam main reinforcing bar 12 and fixes the fixing portion 21 a to the concrete 16. This fixing reinforcing bar 21 can cope with the case where the distance between the adjacent beam main reinforcing bars 12, 12 is different without changing the size of the fixing reinforcing bar 21, etc., and can reduce the material cost and reduce the cost. Become.
[0036]
Further, in the above-described embodiment, the fixing hardware 14 is configured by the nut portion 14a and the flange portion 14b provided at the intermediate portion thereof. However, as shown in FIG. 5A, a flange is provided at the end portion of the nut portion 22a. As shown in FIG. 5B, the fixing metal member 22 provided with the portion 22b or the fixing metal member 23 provided with the collar portion 23b at the end of the nut portion 23a on the closed side is closed. It can also be used.
(To the inventor; if there are special effects of these fixing hardware 22, 23, please fill in and return.)
(Second Embodiment)
FIG. 6 shows a second embodiment of the present invention. In the second embodiment, as shown in FIG. 6A, the tip of the column main reinforcing bar 12 on the beam upper end side is bent downward (vertical direction) to form a vertical portion 12b, and this vertical portion 12b. Is fixed to the concrete 16. The length of the vertical portion 12 b is a length that fits within the column-beam joint, and does not extend to the inside of the column 10.
[0037]
Further, as shown in FIG. 6B, the fixing reinforcing bars 15 are arranged only on one side of the fixing hardware 14, that is, on the beam 11 side. Further, the fixing hardware 14 and the fixing reinforcing bar 15 are disposed in the vicinity of the vertical portion 12 b of the beam main reinforcing bar 12. The rest is the same as the example shown in FIG.
[0038]
According to the second embodiment, the fixing force of the vertical portion 12b of the beam main reinforcing bar 12 and the fixing force of the fixing reinforcing bar 15 work synergistically, so that the fixing metal 14 can be prevented from jumping up more effectively.
[0039]
【The invention's effect】
As described above, according to the present invention, since the beam main reinforcing bar arranged on the upper end side of the beam is restrained by the fixing force of the fixing portion of the fixing reinforcing bar, the fixing force of the beam main reinforcing bar is increased. Can do.
[0040]
Therefore, it is not necessary to bend the tip of the beam main reinforcing bar to provide a vertical part, and even if a vertical part is provided to the beam main reinforcing bar, it is not necessary to lengthen the length of the reinforcing bar in the column beam joint. It becomes very easy and the construction cost can be reduced.
[0041]
In addition, since the vertical part of the main reinforcing bar of the beam does not extend inside the column, the concrete of the column can be placed in advance of the beam, thereby preventing the process from becoming congested and the work period being lengthened as in the prior art.
[Brief description of the drawings]
1A and 1B are diagrams for explaining a first embodiment according to the present invention, in which FIG. 1A is a longitudinal cross-sectional view of a column beam joint, and FIG. 1B is a cross-sectional view taken along a line AA in FIG. FIG.
FIG. 2 is a view taken in the direction of arrow B in FIG.
FIG. 3 is a perspective view showing a fixing hardware according to the present invention.
FIG. 4 is a view showing a fixing reinforcing bar according to the present invention.
FIG. 5 is a perspective view showing another embodiment of the fixing hardware according to the present invention.
6A and 6B are diagrams for explaining a second embodiment according to the present invention, in which FIG. 6A is a longitudinal cross-sectional view of a column beam joint, and FIG. 6B is a view taken in the direction of arrow C in FIG. It is.
[Explanation of symbols]
10 Column 11 Beam 12 Beam main rebar 12a Beam main rebar horizontal portion 12b Beam main rebar vertical portion 14, 22, 23 Fixing hardware 15 Fixation reinforcing bar 21 in a substantially inverted U shape Fixing reinforcement 21 in a substantially inverted J shape Fixing reinforcement bars 15a and 21a Fixing reinforcement bar fixing parts 15b Fixing reinforcement bar connection parts 16 Concrete

Claims (3)

It is a method of fixing a main beam reinforcing bar in a column beam joint in the top floor or the roof of a reinforced concrete structure or a steel reinforced concrete structure,
Forming a vertical portion extending downward at the tip of the beam main reinforcing bar ;
Attach a fixing hardware to increase the fixing power of the concrete in the vicinity of the vertical part of the beam main reinforcing bar that is horizontally arranged on the upper end side of the beam,
A pair of fixing parts extending below the beam main reinforcing bar , and a fixing part thereof, in the vicinity of the fixing metal and in the vicinity of the vertical part of the beam main reinforcing bar horizontally arranged on the upper end side of the beam. Hook a fixed reinforcing bar in the shape of an inverted U consisting of connecting parts to be connected,
A method for fixing a main beam reinforcing bar in a beam-to-beam joint at the top floor or a roof floor, wherein a pair of fixing portions of the fixing reinforcement are fixed to concrete in the beam-to-column connection. The fixing method of the beam main reinforcement in the column beam joint part of the top floor or the roof floor according to claim 1, wherein a plurality of the fixing reinforcing bars are hooked on the beam main reinforcement at a predetermined interval. Fixing of the beam main reinforcing bars in the beam-column joints of the top floor or Yakai according to claim 1 or 2, characterized in that hooked onto the horizontal portion of the two or more of the beam main reinforcing bars for continuously the fixing reinforcement Method.

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