JP7343296B2 - Beam reinforcement structure and beam reinforcement method - Google Patents

Description

The present invention relates to a beam reinforcing metal fitting, a beam reinforcing structure, and a beam reinforcing method for reinforcing a beam having a through hole in a building structure.

Conventionally, through holes are sometimes formed in the beams of architectural structures to allow piping and wiring to pass through. In this case, the bending strength of the beam decreases due to the through hole. In order to prevent the bending strength of the beam from decreasing, beam reinforcing metal fittings are attached to the beam to strengthen it.

As such a beam reinforcing metal fitting, for example, there is a beam reinforcing metal fitting which is a ring-shaped member and is joined to a through hole formed in a beam (for example, Patent Document 1).

Furthermore, when constructing a building structure, fall prevention nets are hung on hooks attached to columns and beams to prevent objects and workers from falling during work (for example, Patent Document 2).

Japanese Patent Application Publication No. 2009-167615 Japanese Patent Application Publication No. 2004-232351

However, when reinforcing beams using conventional beam reinforcing metal fittings and hooking the aforementioned fall prevention net onto hooks installed on pillars or beams, the hooks may be attached to the pillars or beams on site or the hooks removed after the net is used. This increases the number of work steps.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a beam reinforcing metal fitting, a beam reinforcing structure, and a beam reinforcing method that can prepare for attaching a net at the same time as reinforcing the beam.

In order to achieve the above-mentioned object, a first invention provides a beam reinforcement structure using a beam reinforcing metal fitting for reinforcing a beam in which a through hole is formed in a web, the beam reinforcing metal fitting having a through hole formed in the web. A cylindrical main body to be inserted, and a flange formed near one end of the main body and protruding in the radial direction, the main body being inserted between the main body and the flange. A step portion having an outer diameter larger than the flange portion and a smaller outer diameter than the flange portion is formed, and the main body portion is inserted into a through hole formed in the web of the beam and welded to the beam, and the step portion is welded to the beam. The beam reinforcement structure is characterized in that a net is hung over a gap between the web and the flange portion formed by the web.

According to the first invention, the beam reinforcing metal fittings are welded to the beam, and a gap can be formed between the flange part and the web at the step part, so it is possible to hang a net in this gap. . Therefore, by welding the beam reinforcing metal fittings to the beam, preparation for attaching the net can be completed at the same time as reinforcing the beam.

A second invention is a beam reinforcing method using a beam reinforcing metal fitting for reinforcing a beam in which a through hole is formed in a web, wherein the beam reinforcing metal fitting has a cylindrical main body portion inserted into the through hole. and a flange portion formed near one end of the main body portion and protruding in the radial direction, the outer diameter being larger than the main body portion between the main body portion and the flange portion, A step portion having an outer diameter smaller than the flange portion is formed, and the main body portion is inserted into a through hole formed in a web of a beam and welded to the beam, and the web formed by the step portion and the This is a beam reinforcement method characterized by hanging a net in the gap between the flanges.

According to the second invention, since a gap can be formed between the flange part and the web at the step part, it is possible to hang a net in this gap. Therefore, by welding the beam reinforcing metal fittings to the beam, preparation for attaching the net can be completed at the same time as reinforcing the beam, making the work easy.

According to the present invention, it is possible to provide a beam reinforcing metal fitting, a beam reinforcing structure, and a beam reinforcing method that can prepare for attaching a net at the same time as reinforcing a beam.

FIG. 2 is a perspective view showing a beam reinforcing metal fitting 1; FIG. 2 is a side view showing the beam reinforcing metal fitting 1; It is a perspective view which shows the beam reinforcement structure 10, (a) is a figure which shows the back side, (b) is a figure which shows the front side. FIG. 3 is a front view showing the beam reinforcement structure 10. (a), (b), and (c) are cross-sectional views taken along the line AA in FIG. 4. FIG. 3 is a side view showing the beam reinforcing metal fitting 1a. FIG. 3 is a partial cross-sectional view of a beam reinforcement structure using beam reinforcement fittings 1a.

(First embodiment)
Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a beam reinforcing metal fitting 1 according to this embodiment, and FIG. 2 is a side view. The beam reinforcing metal fitting 1 is composed of a main body portion 3, a flange portion 5, a step portion 7, and the like. The beam reinforcing metal fitting 1 is a member for reinforcing a beam in which a through hole is formed in the web.

The beam reinforcing metal fitting 1 is a member made of metal such as steel or stainless steel. The beam reinforcing metal fitting 1 is a ring-shaped member as a whole, and has a pipe hole through which a pipe or the like passes. The main body portion 3 is a cylindrical portion inserted into a through hole of a beam, which will be described later. A flange portion 5 is provided near one end of the main body portion 3 . The flange portion 5 is a portion having a larger outer diameter than the main body portion 3 and protrudes in the radial direction of the main body portion 3.

A stepped portion 7 having a larger outer diameter than the main body portion 3 and a smaller outer diameter than the flange portion 5 is formed between the main body portion 3 and the flange portion 5 . That is, on one end side of the main body part 3, the outer diameters of the main body part 3, the step part 7, and the flange part 5 increase in this order. Note that the inner diameters of the main body portion 3, the flange portion 5, and the step portion 7 are approximately the same, and no unevenness is formed on the inner peripheral surface.

Note that the step portions 7 may be formed continuously over the entire circumference of the main body portion 3 as illustrated, but may also be formed at a plurality of locations at predetermined intervals in the circumferential direction. Furthermore, it is desirable that the end surface (ring-shaped surface when viewed from the main body 3 side) of the stepped portion 7 is approximately perpendicular to the outer circumferential surface of the main body 3, but the outer circumferential surface of the stepped portion 7 and the flange may be smoothly connected to the end face of the . For example, the outer peripheral surface of the stepped portion 7 and the end surface of the flange portion 5 may be connected in an arc shape or a tapered shape.

Next, a beam reinforcement structure 10 using the beam reinforcement fittings 1 will be explained. 3(a) is a perspective view of the beam reinforcement structure 10 seen from the back side 15b of the web 15, and FIG. 3(b) is a perspective view of the beam reinforcement structure 10 seen from the front side 15a of the web 15. be. Moreover, FIG. 4 is a front view of the beam reinforcement structure 10.

The beam 11 is made of H steel having flanges 13 above and below the web 15. A through hole 17 is formed in the web 15 for passing piping and the like. The beam reinforcing metal fitting 1 is arranged in the through hole 17. As described above, the main body portion 3 of the beam reinforcing metal fitting 1 is inserted into the through hole 17. The stepped portion 7 makes surface contact with the web 15 near the edge of the through hole 17 . Thereby, even if there is a burr or the like on the edge of the through hole 17, it can be hidden by the beam reinforcing metal fitting 1. Furthermore, the stepped portion 7 functions as a spacer that can form a gap 7a between the web 15 and the flange portion 5.

The beam reinforcing metal fitting 1 is joined to the web 15 by welding. FIG. 5(a) is a partial cross-sectional view taken along line AA in FIG. In addition, in FIG. 5(a), illustration of the net etc. on the back surface 15b side is omitted. In this embodiment, the outer peripheral portion of the main body portion 3 is welded to the web 15 over the entire circumference. That is, the welded portion 19 is formed between the outer peripheral portion of the main body portion 3 and the back surface 15b of the web 15.

In the beam reinforcement structure 10, a fall prevention net 9 is hung in a gap 7a formed at the step portion 7 between the flange portion 5 of the beam reinforcement fitting 1 and the web 15 on the front surface 15a of the web 15. Further, the beam 11 is provided with a hook 8 on the back surface 15b side of the web 15, and a net 9 for fall prevention is also hung on the hook 8 (see FIG. 3(a)). The net 9 hung on the step part 7 (gap 7a) and the net 9 hung on the hook 8 are respectively placed so as to cover the edge of the flange 13 on the lower side of the beam 11, and are placed on the side of the beam 11 during work. Prevent objects and workers from falling in the opposite direction.

Note that, as shown in FIG. 5(b), the outer peripheral portion of the stepped portion 7 may be welded to the web 15. That is, the welded portion 19 is formed between the outer peripheral portion of the stepped portion 7 and the front surface 15a of the web 15. Moreover, when welding the outer peripheral part of the step part 7, as shown in FIG.5(c), the inner surface side of the flange part 5 may be made into a taper shape. That is, the flange portion 5 may have a tapered shape so that the diameter gradually increases from the step portion 7 toward the front end surface. This makes welding easier. Furthermore, the welded portions 19 may be formed on both sides of the beam reinforcing metal fitting 1. In addition, when welding the stepped portion 7 side, the height of the welded portion 19 is made lower than the outer diameter difference between the stepped portion 7 and the flange portion 5, and a gap 7a is created between the flange portion 5 and the web 15. Let it remain. That is, the welded portion 19 needs to be welded so that it does not protrude outward beyond the flange portion 5 and does not fill the gap 7a between the flange portion 5 and the web 15.

Next, a beam reinforcing method (construction method of the beam reinforcing structure 10) using the beam reinforcing metal fitting 1 will be explained. First, the beam 11 is temporarily placed in a work yard with the front 15a side of the web 15 facing upward, and the main body 3 of the beam reinforcing metal fitting 1 is inserted into the through hole 17 from the front 15a side of the web 15 of the beam 11. At this time, the step portion 7 of the beam reinforcing metal fitting 1 has a larger outer diameter than the through hole 17 provided in the beam 11. Further, the main body portion 3 has an outer diameter smaller than the diameter of the through hole 17 provided in the beam 11. Therefore, when the main body portion 3 is inserted into the through hole 17, the stepped portion 7 can be brought into contact with the web 15. That is, the stepped portion 7 is used for axial positioning when the beam reinforcing metal fitting 1 is inserted into the through hole 17.

Once the position of the beam reinforcing metal fitting 1 is determined, the beam reinforcing metal fitting 1 is temporarily fixed as necessary, and the welded part 19 is inserted between the outer circumference of the main body part 3 and the back side 15b of the web 15 from the back side 15b of the web 15. The beam reinforcing metal fitting 1 is fixed to the web 15 by forming the beam reinforcing metal fitting 1. Note that the welded portion 19 may be on the front 15a side of the web 15, or may be on the back side 15b. Welding is performed, for example, by shielded arc welding.

After welding the beam reinforcing metal fittings 1 to the beam 11, the beam 11 is installed at the site. That is, the beam 11 is joined to a joint with a pillar (not shown). Then, a fall prevention net 9 is hung in the gap 7a between the flange portion 5 and the web 15, which is formed in the step portion 7 formed on the beam reinforcing metal fitting 1. A net 9 is also hung on a hook 8 attached to the back side 15b of the web 15. The hook 8 may be attached to the back surface 15b of the web 15 in advance or may be attached on site.

Through the above steps, the beam reinforcement structure 10 can be obtained. The beam reinforcing metal fitting 1 can improve the bending strength in the vicinity of the through hole 17 of the beam 11.

As described above, according to the present embodiment, since the step part 7 and the flange part 5 are formed in the beam reinforcing metal fitting 1, when the beam reinforcing metal fitting 1 is fixed to the beam 11, the net 9 for preventing falling is hung. Is possible. Therefore, by welding the beam reinforcing metal fittings 1 to the beam 11, preparation for attaching the net 9 can be completed at the same time as reinforcing the beam 11. Further, as soon as the beam 11 is installed at the site, a net 9 can be hung over the stepped portion 7 (gap 7a) to prevent the beam from falling.

(Second embodiment)
Next, a second embodiment will be described. FIG. 6 is a side view of the beam reinforcing metal fitting 1a, and FIG. 7 is a partial sectional view of a beam reinforcing structure using the beam reinforcing metal fitting 1a. In the following description, components that have the same functions as the beam reinforcing metal fitting 1 and the beam reinforcing structure 10 are designated by the same reference numerals as in FIGS. 1 to 5, and redundant explanation will be omitted.

The beam reinforcing metal fitting 1a differs in structure from the beam reinforcing metal fitting 1 in that a groove 6 is formed in the outer peripheral portion of the main body portion 3. A groove 6 is formed in the outer peripheral surface of the beam reinforcing metal fitting 1a in the circumferential direction near the end opposite to the end where the flange 5 and the like of the main body 3 are formed.

When the beam reinforcing metal fitting 1a is fixed to the beam 11, a part of the tip of the main body 3 protrudes from the web 15 on the back surface 15b side of the beam 11. The groove 6 is formed in the protrusion of the body portion 3 from the web 15 . That is, the groove 6 is formed at a predetermined distance from the end surface of the main body portion 3, and is formed in a range where the groove 6 is not hidden by the web 15 on the back surface 15b side of the web 15. Note that the welded portion 19 may be on the front 15a side of the web 15, or may be on the back side 15b.

By using the beam reinforcing metal fittings 1a, the net 9 can be hung over the gap 7a and the groove 6 on either end surface side. Therefore, the net 9 is also hung on the beam reinforcing metal fitting 1a on the back surface 15b side of the web 15 of the beam 11 shown in FIG. 3(a). Therefore, the amount of hooks 8 used can be reduced, and the work can be shortened.

According to the second embodiment, effects similar to those of the first embodiment can be obtained. Also, like the beam reinforcing metal fitting 1a, by forming the groove 6 on the outer peripheral surface near the end of the main body 3 (near the end on the side where the flange part 5 is not provided), the web 15 can be reinforced at the same time as the beam reinforcement. Preparations for attaching the net 9 can also be completed on the rear surface 15b side.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not limited to the embodiments described above. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the technical idea stated in the claims, and these naturally fall within the technical scope of the present invention. It is understood that it belongs.

Further, the main body 3 of the beam reinforcing metal fitting is not limited to a cylindrical shape. For example, if the through hole is square, a beam reinforcing metal fitting may be used in which a step and a flange are formed at the end of a square tubular main body.

1, 1a...Beam reinforcing metal fitting 3...Body part 5...Flange part 6...Groove 7...Step part 7a...Gap 8...Hook 9...Net 10... ...Beam reinforcement structure 11...Beam 13...Flange 15...Web 15a...Front 15b...Back 17...Through hole 19...Welding part

Claims (2)

A beam reinforcement structure using beam reinforcement fittings for reinforcing a beam in which a through hole is formed in the web,
The beam reinforcing metal fittings are
a cylindrical main body portion inserted into the through hole;
a flange portion formed near one end of the main body portion and protruding in the radial direction;
Equipped with
A stepped portion having a larger outer diameter than the main body portion and a smaller outer diameter than the flange portion is formed between the main body portion and the flange portion,
The main body portion is inserted into a through hole formed in a web of a beam and welded to the beam,
A beam reinforcement structure characterized in that a net is hung over a gap between the web and the flange formed by the step. A beam reinforcement method using a beam reinforcement fitting for reinforcing a beam in which a through hole is formed in the web, the method comprising:
The beam reinforcing metal fittings are
a cylindrical main body portion inserted into the through hole;
a flange portion formed near one end of the main body portion and protruding in the radial direction;
Equipped with
A stepped portion having a larger outer diameter than the main body portion and a smaller outer diameter than the flange portion is formed between the main body portion and the flange portion,
The main body portion is inserted into a through hole formed in a web of a beam and welded to the beam,
A method for reinforcing a beam, comprising placing a net over a gap between the web and the flange formed by the step.

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