JPH05321404A - Reinforcement for beam through hole - Google Patents

Abstract

PURPOSE:To improve the reinforcement of a through hole in the easy and mechanically rational manufacture of through hole reinforcement for reinforcing the through hole of a beam used for a structure. CONSTITUTION:Hoop shape reinforcement 24 for reinforcing the periphery of the transverse through hole of a concrete beam is manufactured of one continuous bent reinforcement. This reinforcement 24 is further provided with bilaterally symmetric intersecting parts 28a, 28b and 30a, 30b intersecting in X-shape in concrete above and below the through hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a through hole reinforcing member for a beam of RC or SRC structure.

[0002]

2. Description of the Related Art Generally, when a compressive force or a tensile force is applied to a material, a maximum shearing force is generated in a direction of 45 ° with respect to the acting direction of the force, and when the maximum shearing force exceeds the proof stress of the material. , Materials are known to break. by the way,
The beam of the RC or SRC structure may be provided with a through hole for passing water, sewage, piping such as an air conditioner across the beam. In a beam having such a through hole, it is necessary to reinforce the periphery of the through hole, and various reinforcing bars and reinforcing plates have been conventionally used. For example, a horizontal bar shape in which reinforcing bars are arranged in parallel above and below the through hole in the longitudinal direction of the beam, a wire mesh shape in which mesh-shaped reinforcing bars are arranged around the through hole, and a plate shape using a plate-like one. , Which are assembled and used at the construction site.

Reinforcing bars on the periphery of the transverse through-hole of the conventional beam for reinforcing the periphery of the through-hole have a maximum shearing force generated in the beam with respect to the vertical direction within the cross-section of the through-hole. It was generated in the direction of 45 ° passing through the center of the through hole, and the basic idea was to reinforce the periphery of the hole. Further, recently, an assembly reinforcing material formed in a factory has been used without performing bending work of a reinforcing bar at a construction site or combining and binding a large number of reinforcing bars at a construction site.

As such conventional factory-made reinforcing materials, for example, a spider-shaped reinforcing material composed of a plurality of concentric rings shown in FIG. 5 and a diamond-shaped reinforcing material shown in FIG. 6 are known. The spider-shaped reinforcing member 10 shown in FIG.
The three rebars 12a, 12b, 12c are each end 1
4a, 14b, 14c are welded to form three rings having different diameters, and these three rings are arranged concentrically. Further, in order to fix these three rings to each other and replenish the periphery of the through hole 15, a plurality of radial reinforcing bars 16a, 16b, 16c, 16 are provided.
d, 16e, 16f, 16g, 16h are used. Further, the diamond-shaped reinforcing member 18 shown in FIG.
It is formed by combining two rebars 20a, 20b processed into a square and welding the joints 22a, 22b, 22c, 22d. The shapes shown in FIG. 5 and FIG. 6 above basically cause destruction around the through hole, and the direction of this destruction is the center of the through hole with respect to the vertical direction within the cross section of the through hole. It is based on the idea that it is a 45 ° direction through.

[0005]

However, as a result of the observation by the present inventors of the beam destroyed by the earthquake, the fracture 23 of the concrete 21 of the beam having the through hole as shown in FIG. B) in the concrete above and below the hole, as if the parts vertically separated by the through hole were separate beams, as if they were separate beams. It is clear that it will occur in the direction. Therefore, the above-mentioned conventional reinforcing material has a problem that the destruction 23 cannot be effectively prevented.

Further, since the above-mentioned conventional reinforcing material is a closed loop and is formed by welding, there is a problem that the performance of the high-strength steel used as the material is impaired. In addition, since a plurality of reinforcing bars are welded, there is a problem that it takes time to manufacture. Further, in the spider-shaped reinforcing material, since a plurality of reinforcing bars are fixed to each other, a plurality of radial reinforcing bars, which are originally unnecessary for reinforcing the beam, are required. There is also the problem of inviting improvement.

The present invention has been completed on the basis of such knowledge, and is a reinforcing material for reinforcing the periphery of a through hole of a beam, which is mechanically rational, easy to implement on site, and excellent in shape quality. It is an object of the present invention to provide a factory-made reinforcing material that can use high-strength steel and can be mass-produced in an automated manner.

[0008]

The beam through-hole reinforcing member of the present invention for achieving the above object is a reinforcing member for reinforcing the periphery of a transverse through hole of a concrete beam, and is composed of one continuous bent reinforcing bar. In the concrete above and below the through-hole, there are provided symmetrical intersections intersecting in an X shape.

Further, it is preferable that both end portions of the reinforcing bar have a "C" shape positioned below the sheath so as to support the sheath before the concrete is placed.

[0010]

Since the reinforcing material of the present invention is bent so that the portions arranged in the concrete above and below the through hole intersect in an X shape, the through hole is formed by the reinforcing bars above and below the hole. The two small beams, which are considered to have been formed above and below, will be reinforced and can prevent the concrete from breaking.

Further, since it is formed from one continuous rebar and has no welded portion, it can be used without impairing the performance of high-strength steel. Further, since one bent rebar can be automatically and continuously manufactured by the rebar bending machine, the manufacturing cost can be reduced and the manufacturing process can be simplified.
If both end portions of the reinforcing bar are formed in a "H" shape, the reinforcing material supports the sheath, so that the positioning of the sheath becomes easy and the relative position of the sheath and the reinforcing material becomes accurate.

[0012]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 4 are front views showing an embodiment of the present invention. These reinforcing materials are formed by bending one continuous reinforcing bar made of high-strength steel, and various reinforcements are produced by using the computer-controlled one-stroke rebar bending machine proposed by the applicant. Shapes can be automatically and continuously manufactured.

The reinforcing member 24 of the first embodiment shown in FIG. 1 is bent so that the two reinforcing bars 28a and 28b arranged in the concrete above the through hole 26 intersect in the X shape. Therefore, the reinforcing bar 28b effectively bears the shearing force corresponding to the crack (see FIG. 7) directed to the upper left from the concrete in contact with the upper right portion of the through hole 26. Also, the through hole 2
Even in the concrete below 6, two rebars 30a,
Since 30b is bent so as to intersect with the X shape, each reinforcing bar effectively bears the shearing force generated.

As described above, since the reinforcing bars are arranged in the directions substantially orthogonal to the plurality of directions in the concrete above and below the through hole to be reinforced most effectively, the penetrating is rational. The holes will be reinforced. Further, in the embodiment, both end portions 32 and 34 of the reinforcing bar are formed in the shape of "C" so as to support the bottom of the sheath, so that the sheath is supported by the both end portions of the reinforcing bar during concrete pouring. No other means for fixing the sheath is necessary, the positional relationship between the reinforcing material and the sheath is kept correct, and the accuracy of the sheath mounting position is also improved.

Next, the reinforcing member 36 of the second embodiment shown in FIG.
Will be described. Also in the reinforcing member 36, as in the reinforcing member 24 shown in FIG. 1, the reinforcing bars 38a, 38b and 40a, 40b arranged above and below the through hole 26 are bent so as to intersect each other in an X shape. Because
Each rebar effectively bears the shearing forces that occur.

Next, the reinforcing member 42 of the third embodiment shown in FIG.
Will be described. Similar to the reinforcing members 24 and 36 shown in FIGS. 1 and 2, the reinforcing member 42 is also provided with reinforcing bars 44 a, 44 b and 46 arranged above and below the through hole 26.
Since each of a and 46b is bent so as to intersect with the X shape, each rebar effectively bears the generated stress.

Next, the reinforcing member 48 of the fourth embodiment shown in FIG.
Will be described. This reinforcing material 48 is also a reinforcing bar 50 disposed above and below the through hole 26, like the reinforcing materials 24, 36 and 42 shown in FIGS. 1, 2 and 3, respectively.
Since a, 50b and 52a, 52b are bent so as to intersect in an X shape, the respective reinforcing bars effectively bear the shearing force generated.

The three reinforcing members 3 shown in FIGS.
Both end portions of the reinforcing bars 6, 42, and 48 are also formed in the shape of "C" like the tip portion of the reinforcing member 24 shown in FIG. .. Further, the above-mentioned four reinforcing materials can be manufactured in a factory in advance, so that workability at a construction site is good. Further, since there is no welded portion manufactured from one rebar, the performance of the high-strength steel that is the material of the rebar is not impaired, and further labor saving, standardization, and high accuracy can be achieved.

The reinforcing material of the present invention is not limited to the above-mentioned reinforcing materials of four shapes, and includes all reinforcing materials having symmetrical crossing portions intersecting in an X shape in concrete above and below the through hole. ..

[0020]

As described above in detail, the through-hole reinforcing material of the present invention is capable of applying shearing force generated in the direction of 45 ° to the vertical line in the concrete above and below the through-hole. Since the burden is provided at the intersection, the reinforcement above and below the through hole is improved, and the periphery of the hole can be uniformly reinforced. Further, since it is formed from one continuous bent rebar, high-strength steel can be used and automated mass production is possible.

[Brief description of drawings]

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

FIG. 2 is a front view showing a second embodiment of the present invention.

FIG. 3 is a front view showing a third embodiment of the present invention.

FIG. 4 is a front view showing a fourth embodiment of the present invention.

FIG. 5 is a front view showing a conventional spider-shaped reinforcing member.

FIG. 6 is a front view showing a conventional diamond-shaped reinforcing material.

FIG. 7 is a cross-sectional view showing a crack width when a beam is broken by an earthquake or the like when a conventional reinforcing material is used.

[Explanation of symbols]

24, 36, 42, 48 through-hole reinforcement 26 through-holes 28a, 28b, 30a, 30b, 38a, 38b, 4
0a, 40b, 44a, 44b, 46a, 46b, 50
a, 50b, 52a, 52b X-shaped bent reinforcing bar

Claims (1)

[Claims] 1. A reinforcing member for reinforcing the periphery of a transverse through hole of a concrete beam, which is composed of one continuous bent rebar and has a symmetrical crossing intersecting in an X shape in concrete above and below the through hole. A reinforcing member for a beam through hole, which is provided with a portion.