JP2021004494A - Fireproof structure of beam and its construction method - Google Patents

Abstract

To provide a fireproof structure of a beam with excellent fireproof performance and its construction method by enabling to efficiently install a fireproof board on the beam in both cases when an outer wall is installed on a side of the beam prior to the installation of the fireproof board and when the fireproof board is installed prior to the installation of an outer wall.SOLUTION: A fireproof structure 100 of a beam is provided with a beam 10 extending in the width direction of an outer wall 70 with a gap G between it and the outer wall 70 on the indoor side of the outer wall composed of a plurality of outer wall panels 70. On the outdoor side of the beam 10, an engaged metal fitting 24 is directly or indirectly attached to the beam 10, and an engaging metal fitting 35 attached to a fireproof board 30 engages with the engaged metal fitting 24, so that the fireproof board 30 is arranged on the side of the outdoor side of the beam 10.SELECTED DRAWING: Figure 5

Description

The present invention relates to a fireproof structure of a beam and a construction method thereof.

Between the floors of the building, a beam formed of shaped steel such as H-shaped steel extends in the width direction of the outer wall on the indoor side of the outer wall, and the outer wall is formed with respect to this beam. The outer wall panel is attached.

Various fireproof measures are taken for the beams made of shaped steel, which are arranged on the indoor side of the outer wall. For example, measures to arrange a fireproof plate so as to surround the circumference of the beam, and a rectangular fireproof plate in a plan view having fireproof performance in the space formed by the upper and lower flanges and the web of the beam made of H-shaped steel. As an example, there is a measure to fit the above.

However, in the measure of arranging the refractory plate so as to surround the circumference of the beam, the construction is troublesome because the refractory plate is arranged around the beam. In particular, when a beam whose outer wall is arranged on the side as described above is subject to fire resistance measures, the gap between the beam and the outer wall is narrow, so that the workability is poor and the construction work is troublesome. That becomes even more prominent.

On the other hand, according to the measure of fitting a rectangular fireproof plate having fireproof performance into the space formed by the upper and lower flanges of the H-shaped steel and the web, the fireproof plate is fitted so as to block the space. Since it is only crowded, the construction efficiency can be improved. However, for example, it is not possible to cover the outdoor side end portion (edge surface) of the flange of the H-shaped steel, and the exposed edge surface leads to a decrease in fire resistance performance.

Therefore, a fireproof member capable of being easily attached to and detached from a beam formed of a shaped steel material and capable of improving fireproof performance and a beam provided with this fireproof member have been proposed. Specifically, it is a fireproof member attached to a beam made of H-shaped steel, and this fireproof member has a beam insertion portion inserted into a beam space, which is a space formed by upper and lower flanges and a web, and fire resistance performance. It is provided with a covering portion formed integrally with the beam insertion portion while being formed of the material having the above. The end of the covering extends so as to protrude from the beam insertion portion in the direction between the upper and lower flanges, and the covering portion is the edge surface of the flange when the beam insertion portion is inserted into the beam space. Is formed at a position covering the above (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2017-66679

According to the fireproof member described in Patent Document 1, the space formed between the upper and lower flanges of the beam and the edge surface of the flange of the beam can be simultaneously fireproof coated, so that the fireproof performance of the beam can be improved. By the way, since the refractory member described in Patent Document 1 is fitted so as to close the space formed between the upper and lower flanges from the side of the beam, it is efficient when the outer wall is not constructed on the side of the beam. Can be attached to. On the other hand, when the outer wall is constructed on the side of the beam, the space between the outer wall and the beam is generally narrow, so that it may take time and effort to install the refractory member from the side of the beam.

The present invention has been made in view of the above problems, and the case where the outer wall is constructed on the side of the beam prior to the installation of the fireproof board (fireproof member) and the case where the fireproof board is installed prior to the construction of the outer wall. In any case, it is an object of the present invention to enable a fireproof board to be efficiently attached to a beam, and to provide a fireproof structure of a beam having excellent fireproof performance and a construction method thereof.

In order to achieve the above object, one aspect of the fireproof structure of the beam according to the present invention is
On the indoor side of the outer wall composed of a plurality of outer wall panels, a beam extending in the width direction of the outer wall is provided with a gap between the outer wall and the outer wall.
On the outdoor side of the beam, an engaged metal fitting is directly or indirectly attached to the beam.
An engaging metal fitting attached to the fireproof board is engaged with the engaged metal fitting, and the fireproof board is arranged on the outdoor side of the beam.

According to this aspect, on the outdoor side of the beam, the engaging metal fitting attached to the fireproof board is engaged with the engaged metal fitting directly or indirectly attached to the beam, and the beam house is engaged. By having a configuration in which the fireproof board is arranged on the outer side, the engaging metal fitting is engaged with the engaged metal fitting in the vertical direction even when the gap between the beam and the outer wall is narrow. Can be made (hooked). Therefore, it is possible to provide a fireproof structure of the beam that enables efficient attachment of the fireproof board to the beam regardless of whether the outer wall is constructed on the side of the beam or the outer wall is not constructed. Here, "the engaged metal fitting is directly or indirectly attached to the beam" means that the engaged metal fitting is directly attached to the beam by welding or the like, and a steel material or the like is attached to the beam. It means that the engaged metal fittings are indirectly attached to the beam by being joined by welding or the like and the engaged metal fittings being joined to the steel material or the like by welding or the like.

Further, in another aspect of the fireproof structure of the beam according to the present invention, the beam is located between the floors.
A plurality of gusset plates projecting to the outdoor side at predetermined intervals in the width direction are attached to the beam.
The engaged metal fittings are attached to the wide surface of the gusset plate facing in the width direction, and the upper fixing metal fitting and the lower fixing metal fitting are attached to the upper end and the lower end of the gusset plate, respectively.
The upper floor fixing bracket is fixed to the upper floor outer wall panel, and the lower floor fixing bracket is fixed to the lower floor outer wall panel.

According to this aspect, a plurality of gusset plates are attached to the beam in the width direction of the outer wall, engaged metal fittings are attached to each gusset plate, and upper fixing metal fittings and lower fixing metal fittings are attached to the upper and lower ends of each gusset plate. By attaching the outer wall panel on the upper floor and the outer wall panel on the lower floor to these, it is possible to provide a fireproof structure of the beam having excellent fire resistance and the outer wall panel being firmly fixed to the beam. Here, since the engaged metal fittings are attached to the two wide surfaces of the gusset plate and the engaging metal fittings are attached to both ends of the refractory board having a length straddling the two gusset plates, they are located on both sides. By engaging the refractory board with one gusset plate, the refractory board can be stably attached to the beam via the two gusset plates.

Further, in another aspect of the fireproof structure of the beam according to the present invention, an upward overhang metal fitting and a downward overhang metal fitting are attached to the upper and lower sides of the wide surface of the gusset plate, respectively, and an upper nut is attached to the upper overhang metal fitting, and the lower portion A lower nut is attached to the overhanging bracket,
Both the upper fixing bracket and the lower fixing bracket have bolt holes.
The bolt holes of the upper fixing bracket are positioned with respect to the upper nut, and the bolts are inserted and bolted to fix the outer wall panel of the upper floor.
The bolt hole of the lower fixing bracket is positioned with respect to the lower nut, and the outer wall panel of the lower floor is fixed by inserting the bolt and joining the bolt.

According to this aspect, the upper overhang metal fitting having the upper nut and the lower overhanging metal fitting having the lower nut are attached to the gusset plate, and the upper fixing metal fitting and the lower fixing metal fitting are bolted to the upper nut and the lower nut, respectively. As a result, the outer wall panel can be efficiently attached to the beam, and a fireproof structure of the beam in which the outer wall panel is firmly fixed to the beam can be provided. The upper fixing bracket and the lower fixing bracket are formed of a shaped steel material such as angle steel, and by applying a long upper fixing bracket and a lower fixing bracket extending in the longitudinal direction of the beam, a plurality of outer wall panels can be attached to them. Can be installed efficiently.

Further, in another aspect of the fireproof structure of the beam according to the present invention, the beam is formed of H-section steel in which a web connects the upper flange and the lower flange.
The refractory board straddles the upper flange and the lower flange, and surrounds the fore-edge surfaces of both flanges on the outdoor side.

According to this aspect, a refractory board engaged with the beam covers the edge surface of the upper and lower flanges of the beam formed of H-shaped steel on the outdoor side to form a refractory structure of the beam having excellent fire resistance. be able to.

Further, in another aspect of the fireproof structure of the beam according to the present invention, the outer wall panel is arranged inside the exterior material, the panel frame disposed on the indoor side of the exterior material, and the inside of the panel frame. With at least insulation,
A fireproof board inside the wall is disposed inside the heat insulating material and faces the beam.

According to this aspect, since the outer wall panel has the in-wall fireproof board facing the beam, the fireproof board arranged on the side of the beam and the in-wall fireproof board in the outer wall panel with a gap in between. By disposing the beams so as to face each other, it is possible to form a refractory structure of the beam having further excellent fire resistance performance.

Further, in another aspect of the fireproof structure of the beam according to the present invention, a fireproof coating material is attached around the indoor side of the beam.

According to this aspect, since the fireproof board is attached to the outdoor side of the beam and the fireproof coating material is attached to the indoor side of the beam, the beam is further surrounded by the fireproof board and the fireproof coating material. It is possible to form a fireproof structure of a beam having excellent fireproof performance.

Further, in another aspect of the fireproof structure of the beam according to the present invention, an ALC floor panel extending to the indoor side is placed on the upper surface of the beam, and a blocking material is provided in the gap between the outer wall panel and the ALC floor panel. It is characterized in that it is arranged.

According to this aspect, since the ALC (Autoclaved Light weight Concrete) floor panel on the upper floor is arranged on the beam, the beam is completely covered with the fireproof board, the fireproof coating material and the ALC floor panel. By being surrounded by concrete, it is possible to form a fireproof structure of a beam having further excellent fireproof performance. Further, by filling the gap between the outer wall panel and the ALC floor panel with the closing material, a fireproof structure of the beam having further excellent fireproof performance can be formed.

Moreover, one aspect of the construction method of the fireproof structure of the beam according to the present invention is
Engagement fittings are attached directly or indirectly to the beam on the outdoor side of the beam, and a plurality of outer wall panels are provided on the outdoor side of the beam with a gap between the beam and the beam. The outer wall construction process to construct the outer wall to be constructed, and
By inserting the refractory board to which the engaging metal fittings are attached into the gap from above or below the beam and engaging the engaging metal fittings with the engaged metal fittings, the outdoor side of the beam is engaged. It is characterized by having a fireproof board installation step of attaching the fireproof board to the side.

According to this aspect, prior to the installation of the fireproof board, the fireproof board is installed in the gap between the beam and the outer wall in the fireproof board installation process after the outer wall is constructed on the outdoor side of the beam in the outer wall construction process. Even in the construction method, the fireproof board can be efficiently attached to the beam by attaching the fireproof board to the beam while engaging (hooking) the engaging metal fitting of the fireproof board with the engaged metal fitting of the beam. Can be attached. In the case where the beam is between the floors and the outer wall is formed by the outer wall of the lower floor and the outer wall of the upper floor, the outer wall construction process is performed on both the outer wall of the lower floor and the outer wall of the upper floor. It also includes the construction of the outer wall of the lower floor and the outer wall of the upper floor. In the latter case, the outer wall construction process of constructing the outer wall of the lower floor in advance, the fireproof board installation process, and the outer wall construction process of constructing the outer wall of the upper floor are sequentially executed.

In addition, another aspect of the method for constructing a fireproof structure of a beam according to the present invention is
On the outdoor side of the beam, by engaging the engaging metal fitting attached to the fireproof board with the engaged metal fitting directly or indirectly attached to the beam, the outdoor side of the beam is engaged. The fireproof board installation process to attach the fireproof board to the side,
It is characterized by having an outer wall construction step of constructing an outer wall composed of a plurality of outer wall panels with a gap between the beam and the fireproof board.

According to this aspect, a construction method in which the fireproof board installation process is performed prior to the outer wall construction process ensures that the outer wall is not constructed on the outdoor side of the beam, that is, a relatively large construction space is secured on the outdoor side of the beam. Since the fireproof board can be attached in this state, the fireproof board can be attached to the beam more efficiently.

As can be understood from the above description, according to the beam fireproof structure and its construction method of the present invention, the case where the outer wall is constructed on the side of the beam prior to the installation of the fireproof board and the case where the outer wall is constructed prior to the construction of the outer wall. In any case where the fireproof board is installed, the fireproof board can be efficiently attached to the beam, and a fireproof structure of the beam having excellent fireproof performance and a construction method thereof can be provided. ..

It is a figure which shows the beam which forms the fireproof structure of the beam which concerns on embodiment, and the gusset plate attached to the beam, and is the vertical sectional view orthogonal to the longitudinal direction of the beam. It is the view of the arrow II-II of FIG. It is a view of the arrow III-III of FIG. 1, and is the side view of the beam seen from the back of the upper overhang metal fitting and the lower overhang metal fitting. (A) is a side view of the refractory board viewed from a wide surface to which the engaging metal fittings are attached, and (b) is a view taken along the line b of (a). It is a vertical cross-sectional view which shows an example of the fireproof structure of the beam which concerns on embodiment. It is a process drawing which shows an example of the construction method of the fireproof structure of the beam which concerns on embodiment. Following FIG. 6, it is a process drawing which shows an example of the construction method of the fireproof structure of a beam. Following FIG. 7, it is a process drawing which shows an example of the construction method of the fireproof structure of a beam.

Hereinafter, an example of the fireproof structure of the beam and the construction method thereof according to the embodiment will be described with reference to the attached drawings. In the present specification and the drawings, substantially the same components may be designated by the same reference numerals to omit duplicate explanations.

[Fireproof structure of beam according to the embodiment]
First, an example of the fireproof structure of the beam according to the embodiment will be described with reference to FIGS. 1 to 5. Here, FIG. 1 is a view showing a beam forming a fireproof structure of the beam according to the embodiment and a gusset plate attached to the beam, and is a vertical cross-sectional view orthogonal to the longitudinal direction of the beam. Further, FIG. 2 is a view taken along the line II-II of FIG. 1, a side view of the beam viewed from the back surface of the engaged metal fitting, and FIG. 3 is a view taken along the line III-III of FIG. It is a side view of the beam seen from the back of the upper overhang metal fitting and the lower overhang metal fitting. Further, FIG. 4A is a side view of the refractory board viewed from a wide surface to which the engaging metal fittings are attached, and FIG. 4B is an arrow view in the b direction of FIG. 4A. .. Further, FIG. 5 is a vertical cross-sectional view showing an example of the fireproof structure of the beam according to the embodiment. In the illustrated example, the gusset plate is attached to the H-shaped steel forming the beam, and the engaging metal fitting attached to the fireproof board engages with the engaged metal fitting attached to the gusset plate. Although shown, other forms such as a form in which the fireproof board engages with the engaged metal fittings directly attached to the H-shaped steel by welding or the like may be used.

The beam 10 shown in FIG. 1 is a beam arranged on the side of the outer wall between the first floor and the second floor, between the second floor and the third floor, and the like, and the upper flange 11 and the lower flange 12 And an H-section steel having a web 13 connecting them.

A gusset plate 20 is attached to the outdoor space formed by the upper flange 11, the lower flange 12, and the web 13 of the beam 10, and as shown in FIG. 2, in the width direction of the outer wall. A plurality of gusset plates 20 are attached at intervals t corresponding to the width of the outer wall panel 30 shown in FIG. 4 in the L direction, which is the longitudinal direction of the beam 10. For example, this interval t can be set to 1P or 2P when the width of the outer wall panel 30 is 1P (1P is about 800 mm to 1000 mm, for example, 910 mm).

As shown in FIG. 1, the gusset plate 20 is a joint plate 21 housed in a space formed by an upper flange 11, a lower flange 12, and a web 13 and welded to the joint plate 21, and a joint plate 21. It has an overhang plate 22 that continuously projects upward to the outdoor side, and is formed of a flat steel plate.

As shown in FIGS. 1 and 2, of the left and right wide surfaces of the gusset plate 20, two engaged metal fittings 24 formed of angle steel are welded in the vicinity of the joint plate 21 to the overhang plate 22. It is joined by.

Further, as shown in FIGS. 1 and 3, of the left and right wide surfaces of the gusset plate 20, two upward overhang metal fittings 25 formed of angle steel move up and down the wide surface at the upper end of the overhang plate 22. It is joined by welding in a posture toward. A bolt hole 25a is provided in the upper overhanging metal fitting 25, and an upper nut 26 is joined by welding at a position corresponding to the bolt hole 25a on the lower surface of the upper overhanging metal fitting 25.

Similarly, as shown in FIGS. 1 and 3, of the left and right wide surfaces of the gusset plate 20, at the lower end of the overhang plate 22, two downward overhang metal fittings 27 formed of angle steel form the wide surface. They are joined by welding in a vertical position. A bolt hole 27a is provided in the lower overhanging metal fitting 27, and a lower nut 28 is joined by welding at a position corresponding to the bolt hole 27a on the upper surface of the lower overhanging metal fitting 27.

As shown in FIGS. 4A and 4B, the refractory board 30 is formed of a rock wool board, gypsum board, or the like having a rectangular shape in a plan view (for example, 903 x 400 x 21 mm (thickness)). A reinforced gypsum board in which glass fiber is added to a gypsum core to enhance fire resistance is suitable.

Of the wide surface 31 on the indoor side of the refractory board 30, two engaging metal fittings 35 are fixed in the vicinity of the left and right narrow end surfaces 32 by fixing means such as screws 40. The engaging metal fitting 35 is formed by bending a flat steel material, and the fixing piece 35a into which the screw 40 is driven, the wraparound piece 35b that bends from the end side of the fixing piece 35a and wraps around to the indoor side, and the end of the wraparound piece 35b It has an engaging piece 35c that bends from the side and directly engages with the engaged metal fitting 24.

Further, two gripping metal fittings 38 are fixed by fixing means such as screws 40 in the vicinity of the left and right narrow end surfaces 32 of the lower ends of the wide surface 31 on the outdoor side of the refractory board 30. The grip fitting 38 may be provided at an appropriate position on the wide surface of the refractory board 30 on the outdoor side so that the worker can easily grip and handle the refractory board 30.

In FIG. 5, the beam 10 is located on the indoor side of the outer wall 70, and the engaging metal fitting 35 of the refractory board 30 is attached to the engaged metal fitting 24 of the gusset plate 20 attached to the beam 10. The fireproof structure 100 of the beam formed by engaging is shown.

There is a narrow gap G between the beam 10 and the outer wall 70, and the engaging metal fitting 35 engages with the engaged metal fitting 24 on the outdoor side of the beam 10 (inside the gap G). A fireproof board 30 is attached. More specifically, the refractory board 30 extends from the outdoor side edge surface of the upper flange 11 to the outdoor edge surface of the lower flange 12 on the side of the beam 10, and is above and below these. It is attached so as to completely block the edge surface of the.

The beams 10 are arranged between the floors, and the outer wall 70 on the outdoor side of the beam 10 with the gap G interposed therebetween is formed by the outer wall 70B of the lower floor and the outer wall 70A of the upper floor, and the outer walls 70A and 70B, respectively. Are all formed by a plurality of outer wall panels.

The outer wall panel 70 is formed by laminating an exterior material 71, an underlaying material 72, and a panel frame 73 in order from the outdoor side, and the inside of the panel frame 73 is filled with a heat insulating material 74.

The exterior material 71 is formed of, for example, a ceramic-based or metal-based siding board. Further, the underlaying material 72 is formed of a glass wool board or the like. An exterior base material (not shown) formed of a hard wood piece cement board or the like is interposed between the exterior material 71 and the underlay material 72, and the exterior base material is used between the exterior material 71 and the underlay material 72. A ventilation layer 75 is formed. The panel frame 73 is formed by assembling light iron channel steel in a frame shape. Further, the heat insulating material 74 is made of glass wool, rock wool or the like. Although not shown, an interior material formed of a moisture-proof sheet, gypsum board, or the like is attached to the indoor side of the outer wall panel 70.

Further, inside the heat insulating material 74 of the outer wall panel 70A on the upper floor, an in-wall fireproof board 78 formed of a rock wool board, a gypsum board, or the like is arranged at a position facing the fireproof board 30 and is provided on the beam 10. Facing. Here, from the viewpoint of fire resistance around the beam 10, it is preferable that both the fire resistance board 30 and the fire resistance board 78 in the wall are formed of reinforced gypsum board. In the illustrated example, the fireproof board 78 inside the wall is embedded only inside the heat insulating material 74 of the outer wall panel 70A on the upper floor, but in addition to this, in addition to this, inside the heat insulating material 74 of the outer wall panel 70B on the lower floor. The fireproof board in the wall may be embedded.

On the upper surface of the upper overhanging metal fittings 25 attached to the upper ends of the plurality of gusset plates 20 shown in FIG. 3, an upper fixing metal fitting 50 extending in the longitudinal direction of the beam and formed of angle steel is placed. In the upper fixing metal fitting 50 in the mounted state, a bolt hole 51 is provided at a position corresponding to the bolt hole 25a of each upper overhanging metal fitting 25. By screwing the bolt 60 (double-cut bolt) into the corresponding upper nut 26 and the bolt holes 25a and 51, the upper fixing bracket 50 is bolted over the upper ends of the plurality of gusset plates 20.

Similarly, the lower fixing bracket 55 formed of angle steel, which extends in the longitudinal direction of the beam, abuts on the lower surface of the lower overhanging bracket 27 attached to the lower ends of the plurality of gusset plates 20 shown in FIG. A bolt hole 56 is provided at a position corresponding to the bolt hole 27a of each of the downward overhanging metal fittings 27 in the lower fixing metal fitting 55 in the abutted state. By screwing the bolt 60 (double-cut bolt) into the corresponding lower nut 28 and the bolt holes 27a and 56, the lower fixing bracket 55 is bolted over the lower ends of the plurality of gusset plates 20.

Of the upper fixing metal fittings 50 made of angle steel bolted to the upper surface of the upper overhanging metal fittings 25, bolt holes 52 are provided in the flanges that rise upward at predetermined intervals in the longitudinal direction of the upper fixing metal fittings 50. There is. On the other hand, bolt holes 73a are also provided in the panel frame 73 constituting the outer wall panel 70A on the upper floor at intervals in the width direction of the outer wall panel 70A, and bolts 65 (bolts 65) are provided in both of the corresponding bolt holes 52 and 73a. By screwing the hook bolt), the outer wall panel 70A on the upper floor is bolted to the upper fixing bracket 50.

Similarly, of the lower fixing metal fittings 55 made of angle steel bolted to the lower surface of the lower overhanging metal fittings 27, bolt holes 57 are provided on the flanges that are lowered downward at predetermined intervals in the longitudinal direction of the lower fixing metal fittings 55. It has been opened. On the other hand, bolt holes 73a are also provided in the panel frame 73 constituting the outer wall panel 70B on the lower floor at intervals in the width direction of the outer wall panel 70B, and bolts 65 (bolts 65) are provided in both of the corresponding bolt holes 57 and 73a. By screwing the hook bolt), the outer wall panel 70B on the lower floor is bolted to the lower fixing bracket 55.

A horizontal joint is formed at the interface between the outer wall panel 70A on the upper floor and the outer wall panel 70B on the lower floor, which are bolted to each of the upper fixing bracket 50 and the lower fixing bracket 55, and a dry or wet seal is formed on this horizontal joint. By disposing the material 76, the outer wall panel 70A on the upper floor and the outer wall panel 70B on the lower floor are constructed between the floors.

A plurality of welding pins 85 are joined to the edge surface of the upper flange 11 on the indoor side and the lower surface of the lower flange 12 of the beam 10. A plurality of refractory coating materials 80 are arranged so as to extend from the indoor side edge surface of the upper flange 11 of the beam 10 to the indoor side edge surface of the lower flange 12 and further to the lower surface of the lower flange 12. It is fixed to the welding pin 85 of. In the illustrated example, the fireproof coating material 80 extends to the side surface of the outer wall panel 70B on the lower floor, and the end portion of the fireproof coating material 80 is fixed to the side surface of the wall panel 70B by a screw 40. Here, the fireproof coating material 80 is formed of, for example, a laminated body of heat-resistant rock wool molded into a felt shape and a flame-retardant non-woven fabric.

An ALC floor panel 90 extending to the indoor side is placed on the upper surface of the upper flange 11 forming the beam 10, and a closing member 95 is arranged in the gap between the outer wall panel 70 and the ALC floor panel 90. ing.

Here, rock wool or glass wool is applied as the blocking material 95. Since these materials are fiber-based heat insulating materials and have heat insulating performance and heat shielding performance, the gap between the outer wall panel 70 and the ALC floor panel 90 is completely closed to improve the fire resistance performance of the beam fireproof structure 100. Contribute to. Furthermore, for example, the energy of sound incident on the glass wool insulation material propagates inside the glass wool and is converted into heat energy by vibrating the glass fibers and air. Therefore, especially when the glass wool insulation material is applied, the bass range to the high range It will have a wide range of sound absorption characteristics up to the sound range.

According to the fireproof structure 100 of the beam, the engaging metal fitting 35 attached to the fireproof board 30 is engaged with the engaged metal fitting 24 attached to the outdoor side of the beam 10, and the beam 10 is engaged. By having the configuration in which the fireproof board 30 is arranged on the outdoor side of the above, even when the gap G between the beam 10 and the outer wall 70 is narrow, the engagement metal with respect to the engaged metal fitting 24 The tool 35 can be hooked in the vertical direction. Therefore, the fireproof board 30 can be efficiently attached to the beam 10 in both the case where the outer wall 70 is installed on the side of the beam 10 and the case where the outer wall 70 is not installed.

Further, an upper overhanging metal fitting 25 having an upper nut 26 and a lower overhanging metal fitting 27 having a lower nut 28 are attached to the gusset plate 20, and the upper fixing metal fitting 50 and the lower fixing metal fitting 55 are attached to the upper nut 26 and the lower nut 28, respectively. The outer wall panel 70 is bolted to the upper fixing bracket 50 and the lower fixing bracket 55, so that the outer wall panel 70 can be efficiently and firmly attached to the beam 10.

Further, the refractory board 30 engaged with the beam 10 covers the edge surface on the outdoor side of the flange 11 above the beam 10 and the flange 12 below, and from the edge surface on the indoor side of the flange 11 above the beam 10. By disposing the fireproof coating material 80 over the edge surface of the lower flange 12 on the indoor side and further over the lower surface of the lower flange 12, the fireproof structure 100 of the beam having excellent fireproof performance is obtained. In the fireproof structure 100 of the beam, the fireproof board 78 in the wall is arranged at a position facing the fireproof board 30 inside the heat insulating material 74 of the outer wall panel 70A and faces the beam 10, and further above the beam 10. The fact that the ALC floor panel 90 is placed on the upper surface of the flange 11 also contributes to excellent fire resistance.

[Construction method of fireproof structure of beam according to the embodiment]
Next, an example of a method for constructing the fireproof structure of the beam according to the embodiment will be described with reference to FIGS. 6 to 8 and FIG. 5 already referred to in the description of the fireproof structure of the beam. Here, FIGS. 6 to 8 and then FIG. 5 are process drawings of an example of a method of constructing a fireproof structure in that order.

First, as shown in FIG. 6, on the outdoor side of the beam 10 to which the gusset plate 20 projecting to the outdoor side is attached, an outer wall composed of a plurality of outer wall panels 70 with a gap G between the beam 10 and the beam 10 is provided. To construct.

Here, the beam 10 is a beam between floors, and an upward overhang metal fitting provided with an upper nut 26 at the upper and lower ends of a plurality of gusset plates 20 joined to the beam 10 at intervals in the longitudinal direction. A downward overhang metal fitting 27 having a 25 and a lower nut 28 is attached.

Then, the upper fixing metal fitting 50 extending in the longitudinal direction of the beam 10 is placed on the upper overhanging metal fitting 25 and bolted to the upper nut 26, and the lower fixing metal fitting 55 extending in the longitudinal direction of the beam 10 is attached to the lower overhanging metal fitting. It is brought into contact with 27 and bolted to the lower nut 28.

The outer wall of the upper floor is constructed by bolting the outer wall panel 70A of the upper floor to the upper fixing bracket 50, and the outer wall of the lower floor is bolted to the outer wall panel 70B of the lower floor to the lower fixing bracket 55. (The above is the outer wall construction process).

Next, as shown in FIG. 7, the refractory board 30 to which the engaging metal fitting 35 is attached is inserted into the gap G from above the beam 10 in the X1 direction or from below the beam 10 in the X2 direction. At this time, the worker inserts the refractory board 30 into the gap G while gripping the grip metal fitting 38 at the lower end of the refractory board 30.

After inserting the refractory board 30 into the gap G, slide in the X3 direction until the wide surface of the refractory board 30 on the indoor side abuts on the fore-edge surfaces of both the upper flange 11 and the lower flange 12 of the beam 10. Let me. Next, the engaging piece 35c of the engaging metal fitting 35 attached to the wide surface of the refractory board 30 is dropped downward in the X4 direction to engage with the engaged metal fitting 24 attached to the gusset plate 20. As a result, the fireproof board 30 is installed on the outdoor side of the beam 10 (fireproof board installation process).

After the fireproof board 30 is installed on the outdoor side of the beam 10, the ALC floor panel 90 is installed on the upper surface of the flange 11 above the beam 10 as shown in FIG. 8, and the outer wall 70 and the ALC floor panel 90 are installed. After filling the closing material 95 between the beams, the fireproof structure 100 of the beam is constructed by installing the fireproof coating material 80 on the indoor side of the beam 10 as shown in FIG.

Although the illustrated example is a construction method in which the fireproof board installation process is performed after the outer wall construction process, it may be a construction method in which the fireproof board installation process is performed first and then the outer wall construction process is performed.

As described above, regardless of the construction method of the method of constructing the outer wall 70 on the side of the beam 10 prior to the installation of the fireproof board 30, or the method of installing the fireproof board 30 prior to the construction of the outer wall 70. , The fireproof board 30 is inserted into the gap G on the side of the beam 10, and the engaging metal fitting 35 of the fireproof board 30 is dropped and engaged with the engaged metal fitting 24 of the beam 10, and the fireproof board 30 is attached. , The fireproof board 30 can be efficiently attached to the beam 10.

It should be noted that the configuration or the like described in the above embodiment may be another embodiment in which other components are combined, and the present invention is not limited to the configuration shown here. This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form thereof.

10: Beam (H-shaped steel)
11: Upper flange 12: Lower flange 13: Web 20: Gasset plate 21: Joint plate 22: Overhang plate 24: Engagement metal fitting 25: Upper overhang metal fitting 26: Upper nut 27: Lower overhang metal fitting 28: Lower nut 30: Fireproof Board 31: Wide surface 32: Narrow end surface 35: Engagement metal fittings 35c: Engagement piece 38: Gripping metal fittings 40: Screws (fixing means)
50: Upper fixing bracket 51: Bolt hole 55: Lower fixing bracket 56: Bolt hole 60, 65: Bolt 70: Outer wall panel (outer wall)
70A: Outer wall panel on the upper floor (outer wall panel, outer wall)
70B: Outer wall panel on the lower floor (outer wall panel, outer wall)
71: Exterior material 72: Underlay material 73: Panel frame 74: Insulation material 80: Fireproof coating material 85: Welding pin 90: ALC floor panel 95: Closure material 100: Fireproof structure of beam G: Gap

Claims (9)

On the indoor side of the outer wall composed of a plurality of outer wall panels, a beam extending in the width direction of the outer wall is provided with a gap between the outer wall and the outer wall.
On the outdoor side of the beam, an engaged metal fitting is directly or indirectly attached to the beam.
A fire-resistant structure of a beam, characterized in that an engaging metal fitting attached to the fire-resistant board is engaged with the engaged metal fitting, and the fire-resistant board is arranged on the outdoor side of the beam. .. The beam is located between the floors
A plurality of gusset plates projecting to the outdoor side at predetermined intervals in the width direction are attached to the beam.
The engaged metal fittings are attached to the wide surface of the gusset plate facing in the width direction, and the upper fixing metal fitting and the lower fixing metal fitting are attached to the upper end and the lower end of the gusset plate, respectively.
The fireproof structure of a beam according to claim 1, wherein the outer wall panel of the upper floor is fixed to the upper fixing bracket, and the outer wall panel of the lower floor is fixed to the lower fixing bracket. An upper overhang and a lower overhang are attached to the upper and lower sides of the wide surface of the gusset plate, an upper nut is attached to the upper overhang, and a lower nut is attached to the lower overhang.
Both the upper fixing bracket and the lower fixing bracket have bolt holes.
The bolt holes of the upper fixing bracket are positioned with respect to the upper nut, and the bolts are inserted and bolted to fix the outer wall panel of the upper floor.
The second aspect of the present invention is characterized in that the bolt holes of the lower fixing bracket are positioned with respect to the lower nut, and the outer wall panel of the lower floor is fixed by inserting the bolts and joining them with bolts. Fireproof structure of the described beam. The beam is made of H-section steel with a web connecting the upper and lower flanges.
The method according to any one of claims 1 to 3, wherein the refractory board extends from the upper flange to the lower flange and surrounds the fore-edge surface on the outdoor side of both flanges. Fireproof structure of the beam. The outer wall panel includes at least an exterior material, a panel frame disposed on the indoor side of the exterior material, and a heat insulating material disposed inside the panel frame.
The fireproof structure of a beam according to any one of claims 1 to 4, wherein a fireproof board in the wall is disposed inside the heat insulating material and faces the beam. The fireproof structure of a beam according to any one of claims 1 to 5, wherein a fireproof coating material is attached to the periphery of the indoor side of the beam. A1 to 1, wherein an ALC floor panel extending to the indoor side is placed on the upper surface of the beam, and a closing material is arranged in a gap between the outer wall panel and the ALC floor panel. The fireproof structure of the beam according to any one of 6. Engagement fittings are attached directly or indirectly to the beam on the outdoor side of the beam, and a plurality of outer wall panels are provided on the outdoor side of the beam with a gap between the beam and the beam. The outer wall construction process to construct the outer wall to be constructed, and
A fireproof board to which the engaging metal fittings are attached is inserted into the gap from above or below the beam, and the engaging metal fittings are engaged with the engaged metal fittings to engage the engaging metal fittings on the outdoor side of the beam. A method for constructing a fireproof structure of a beam, which comprises a fireproof board installation step of attaching the fireproof board to the side. On the outdoor side of the beam, by engaging the engaging metal fitting attached to the fireproof board with the engaged metal fitting directly or indirectly attached to the beam, the outdoor side of the beam is engaged. The fireproof board installation process to attach the fireproof board to the side,
A method for constructing a fireproof structure of a beam, which comprises an outer wall construction step of constructing an outer wall composed of a plurality of outer wall panels with a gap between the beam and the fireproof board.

Images