JP6778136B2 - Fireproof coating structure of channel steel - Google Patents

Description

The present invention relates to a structure in which channel steel is coated with a refractory sheet that expands by heating.

The channel steel constituting the steel frame such as the ceiling beam and the floor beam of the building unit is covered with a fireproof sheet that secures a predetermined fire resistance by foaming and expanding in the event of a fire (see, for example, Patent Document 1). ).

Japanese Unexamined Patent Publication No. 9-60151

However, in channel steel, since the refractory sheet is bent at a steep angle at the open end of the channel, there is a problem that the refractory sheet is cracked and easily cracked by the heat of a fire.
Further, on the open end side of the groove shape, there is a problem that the refractory sheet foams on both the inner and outer sides due to the heat of a fire, and the covering ability is lowered.

An object of the present invention is to loosen the bending of the refractory sheet at the open end of the channel steel to eliminate damage and improve the refractory performance in a structure in which the channel steel is covered with the refractory sheet.

In order to solve the above problems, the invention according to claim 1 is, for example, as shown in FIGS. 1 to 3.
It is a structure in which channel steel 3 constituting a steel frame such as a ceiling beam or a floor beam of a building is covered with a fireproof sheet 5.
A backing member 13 projecting outward from the open end is provided in the open end of the channel steel 3.
The refractory sheet 5 is covered with the channel steel 3 up to the backing member 13 projecting outward from the open end.

According to the first aspect of the present invention, a backing member 13 projecting outward from the open end is provided in the open end of the channel steel 3, and the refractory sheet 5 is open to the channel steel 3. Since the backing member 13 projecting outward from the end is covered, the bending of the refractory sheet 5 at the open end of the channel steel 3 is moderated by the backing member 13 projecting outward to eliminate damage. The fireproof sheet 5 can be evenly coated on the backing member 13 protruding outward to improve the fireproof performance.
Further, since the backing member 13 projecting outward from the open end is provided in the open end of the channel steel 3, the rigidity of the channel steel 3 is also improved.

The invention according to claim 2 is, for example, as shown in FIGS. 2 and 3.
In the fireproof coating structure of channel steel according to claim 1,
The stacking allowance portion 5a of the refractory sheet 5 is characterized in that it is located on the upper surface side of the channel steel 3.

According to the invention of claim 2, since the stacking allowance portion 5a of the fireproof sheet 5 is located on the upper surface side of the channel steel 3, for example, the fireproof sheet stacking allowance portion 5a is located on the lower surface side of the channel steel 3. It is less susceptible to the influence of gravity than in the case of the above case, and the ends of the refractory sheets 5 in the stacking allowance portion 5a are less likely to separate from each other during foaming due to heat during a fire.

The invention according to claim 3 is, for example, as shown in FIG.
In the fireproof coating structure of channel steel according to claim 2.
A glass fiber tape 15 for reinforcement is thermocompression-bonded along the stacking margin portion 5a of the refractory sheet 5.

According to the invention of claim 3, since the reinforcing glass fiber tape 15 is thermocompression-bonded along the fire-resistant sheet stacking allowance portion 5a, the fire-resistant sheet stacking allowance portion 5a due to the heat of a fire. Good foaming can be ensured by stretching the reinforcing glass fiber tape 15 following the foaming.

The invention according to claim 4 is, for example, as shown in FIGS. 2 and 3.
In the fireproof coating structure of the channel steel according to any one of claims 1 to 3.
The backing member 13 is characterized by being formed of a steel plate having a U-shaped cross section.

According to the invention of claim 4, since the backing member 13 is formed of a steel plate having a U-shaped cross section, the backing member 13 made of a steel plate having a U-shaped cross section is formed of a channel steel 3 and a square pipe. It can be closed and has excellent rigidity.

The invention according to claim 5, for example, as shown in FIGS. 2 and 3.
In the fireproof coating structure of channel steel according to any one of claims 1 to 4.
The channel steel 3 is characterized in that the channel steel 3 is arranged so that the open end faces sideways and is positioned vertically.

According to the invention of claim 5, since the channel steel 3 is arranged so that its open end faces sideways and is positioned vertically, the channel steel 3 has an open end facing sideways. The backing member 13 can be closed to the surface and has excellent rigidity.

The invention according to claim 6 is, for example, as shown in FIGS. 1 to 5.
In the fireproof coating structure of channel steel according to any one of claims 1 to 5.
The channel steel is characterized by being a ceiling beam 3 and a floor beam 2 of a building unit.

According to the invention of claim 6, since the ceiling beam 3 and the floor beam 2 are made of channel steel of the building unit, the fire resistance performance of the ceiling beam 3 and floor beam 2 made of channel steel of the building unit is excellent.
If it is a building unit, it can be manufactured at the factory, and a fireproof sheet can also be attached at the factory.
Therefore, it is possible to reduce the fireproof coating work at the site of the unit type building.

According to the present invention, in a structure in which a channel steel is covered with a refractory sheet, the refractory sheet can be gently bent at the open end of the channel steel to eliminate damage and improve the refractory performance. it can.

It is a perspective view of the building unit to which this invention is applied. It shows the refractory coating structure of the channel steel which concerns on this invention, and is the vertical sectional view of the ceiling beam of FIG. An example of covering the fireproof sheet with respect to the ceiling beam is shown, and is an end view (a), a plan view (b), and a front view (c). An example of a structure in which a fireproof sheet is coated on a floor beam and a floor slab is attached is shown, and is a vertical cross-sectional view (a) and an exploded perspective view (b) of its components. An example of a structure for mounting a refractory sheet on a floor beam and an outer wall is shown, and is a vertical cross-sectional view (a) and a perspective view (b) showing the mounting bracket in an exploded manner.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment)
FIG. 1 shows a building unit to which the present invention is applied. As shown in the figure, the building unit has steel-framed four-cornered columns 1, four-sided floor beams 2, four-sided ceiling beams 3, and eight-cornered joints. The diaphragms 4 of the above are joined to form a substantially rectangular parallelepiped shape.
The pillar 1, the floor beam 2, and the ceiling beam 3 are each covered with a fireproof sheet 5.
Further, the inside of the diaphragm 4 is filled with rock wool, which is a refractory material.
In the illustrated example, a floor slab 6 made of a fireproof coating material or a fireproof panel such as ALC (Autoclaved Lightweight Concrete) is installed on the floor beam 2, and a ceiling beam 7 is erected between the ceiling beams 3. In addition, for example, a ceiling material 8 made of gypsum board is attached.

By assembling such steel columns 1, floor beams 2 and ceiling beams 3 and connecting them in a substantially rectangular shape, the building units are arranged side by side in the front-rear direction and the left-right direction, and are stacked and connected vertically. The desired unit type building is constructed.
In the embodiment, the column 1 is formed of a square steel pipe, and the floor beam 2 and the ceiling beam 3 are formed of a channel steel having a web and upper and lower flanges.

FIG. 2 shows a fireproof coating structure of channel steel according to the present invention. As shown in the drawing, a ceiling beam 3 made of channel steel is provided in the open end of the channel steel and outside the open end. The protruding backing member 13 is integrally joined.
In the illustrated example, the ceiling beam 3 is arranged so that the open end of the channel steel is directed sideways and is positioned vertically.
The open end of the channel steel refers to the tips of the upper and lower flanges of the web.

The backing member 13 is formed of a steel plate having a U-shaped cross section, and the groove of the ceiling beam 3 is formed by inserting the open end having a U-shaped cross section into the channel steel open end of the ceiling beam 3 and welding the backing member 13. A U-shaped side surface portion of the backing member 13 projects from the open end of the shaped steel.
A reinforcing plate 3a is provided inside the channel steel of the ceiling beam 3, and a reinforcing plate 13a is also provided inside the U-shaped cross section of the backing member 13. By providing these reinforcing plates 3a and 13a, the heat reflux inside the steel material due to heating in the event of a fire is reduced.

Then, for example, a fireproof sheet 5 made of foamable acrylic resin is coated along the outer peripheral surfaces of the integrated ceiling beam 3 and the backing member 13.
Here, the stacking allowance portion 5a of the refractory sheet 5 is positioned on the upper surface of the ceiling beam 3 and the backing member 13 and heat-sealed.
Further, the glass fiber tape 15 is attached along the overlapping margin portion 5a of the refractory sheet 5 and buried by thermocompression bonding.

FIG. 3 shows an example of allocating the coating of the refractory sheet 5 to the ceiling beam 3. In FIGS. 3 (b) and 3 (c), the three vertical joints shown by the dotted lines A are the allocation joints of the four refractory sheets 5. The single horizontal joint shown by the dotted line B is the joint joint of the overlapping margin portion 5a of the refractory sheet 5.
In FIG. 3A, the refractory sheet 5 is slanted on the lower surfaces of the ceiling beam 3 and the backing member 13 without following the stepped portion as shown in FIG.
In this way, the refractory sheet 5 may be floated and stretched diagonally without following the stepped portion on the lower surface of the ceiling beam 3 and the backing member 13.

As described above, according to the embodiment, a backing member 13 formed of a steel plate having a U-shaped cross section that protrudes outward from the open end of the channel steel 3 is provided in the channel steel open end of the ceiling beam 3, and the ceiling beam 3 is provided. Since the fireproof sheet 5 is covered from the open end of the channel steel to the backing member 13 protruding outward, the backing member projecting the bending of the fireproof sheet 5 at the open end of the channel steel of the ceiling beam 3 to the outside. 13 can be loosened to eliminate damage.
Further, the refractory performance can be improved by evenly covering the backing member 13 projecting outward from the open end of the channel steel of the ceiling beam 3 with the refractory sheet 5.
Further, the rigidity of the ceiling beam 3 is also improved by providing the backing member 13 made of a steel plate having a U-shaped cross section protruding outward from the open end of the channel steel of the ceiling beam 3.

Then, by locating the stacking allowance portion 5a of the fireproof sheet 5 on the upper surface side of the channel steel of the ceiling beam 3, for example, when the fireproof sheet stacking allowance portion 5a is located on the lower surface side of the channel steel of the ceiling beam 3. It is possible to solve the problem that the ends of the fireproof sheet 5 in the overlapping margin portion 5a are easily separated from each other due to the influence of gravity during foaming due to heat during a fire.
That is, when the fireproof sheet stacking allowance portion 5a is on the lower surface side of the channel steel of the ceiling beam 3, the fireproof sheet 5 foamed by the heat at the time of fire is pulled by gravity to the upper part of the channel steel open end of the ceiling beam 3. There is a problem that tension is applied and the ends of the fireproof sheets 5 in the overlapping margin portion 5a are easily separated from each other.
On the other hand, in the embodiment, the tension is absorbed by the fireproof sheet stacking allowance portion 5a on the upper surface side of the channel steel of the ceiling beam 3, and the fireproof sheet stacking allowance portion 5a is set on the lower surface side of the channel steel 3. However, since it is less likely to be affected by gravity, the ends of the refractory sheets 5 in the overlapping margin portion 5a are less likely to separate from each other during foaming due to heat during a fire, and the above problem can be solved.

Further, by attaching a glass fiber tape 15 for reinforcement along the fireproof sheet stacking allowance portion 5a and thermocompression bonding, the refractory sheet stacking allowance portion 5a is for reinforcement following the foaming due to the heat at the time of fire. By stretching the glass fiber tape 15 of the above, good foaming can be ensured.

Further, since the backing member 13 made of a steel plate having a U-shaped cross section is used, the backing member 13 made of a steel plate having a U-shaped cross section can be closed to the channel steel 3 in a square pipe shape, resulting in excellent rigidity. ..

Moreover, since the ceiling beam 3 is arranged so that the open end of the channel steel faces sideways and is positioned vertically, the backing member 13 can be closed to the channel steel open end facing the side of the ceiling beam 3. It has excellent rigidity.

Since the ceiling beam 3 is made of channel steel of the building unit, the channel steel forming the ceiling beam 3 of the building unit has excellent fire resistance.

4 (a) and 4 (b) show an example of the coating of the fireproof sheet 5 on the floor beam 2 and the mounting structure of the floor slab 6, and as shown in the drawing, the floor beam 2 made of channel steel has a groove shape. A backing member 12 projecting outward from the open end is integrally joined to the open end of the steel.
In the illustrated example, the floor beam 2 is arranged so that the open end of the channel steel thereof faces sideways and is positioned vertically, similarly to the ceiling beam 3.

The backing member 12 is formed of a steel plate having a U-shaped cross section, and the groove of the floor beam 2 is formed by inserting the open end having a U-shaped cross section into the channel steel open end of the floor beam 2 and welding the backing member 12. A U-shaped side surface portion of the backing member 12 projects from the open end of the shaped steel.
A reinforcing plate 2a is provided inside the channel steel of the floor beam 2, and a reinforcing plate 12a is also provided inside the U-shaped cross section of the backing member 12. These reinforcing plates 2a and 12a reduce the heat return inside the steel material due to heating in the event of a fire.

Then, like the ceiling beam 3, a fireproof sheet 5 made of, for example, a foamable acrylic resin is coated along the outer peripheral surfaces of the integrated floor beam 2 and the backing member 12.
The stacking allowance portion 5a of the refractory sheet 5 is located on the upper surface of the floor beam 2 and the backing member 12 and is heat-sealed.

In this way, a backing member 12 formed of a steel plate having a U-shaped cross section projecting outward from the open end of the channel steel of the floor beam 2 is provided, and the fireproof sheet 5 is attached to the floor beam 2. Even if the structure covers the backing member 12 protruding outward from the open end of the channel steel, the same effect as that of the ceiling beam 3 described above can be obtained.

An angle steel 16 is joined to the inner surface of the floor beam 2 on the backing member 12 side by bolts and nuts 17, and a floor slab 6 made of, for example, ALC is fixed on the angle steel 16 with long screws 61. There is.
Further, a thin auxiliary floor slab 6a is fixed to the upper surface of the floor beam 2 with long screws 62.
Then, the refractory coating material 18 is fixed to the lower surface of the floor slab 6 with a washer-integrated screw 63 so as to cover the angle steel 16, and is fixed to the side surface of the floor beam 2 on the backing member 12 side with a washer-integrated welding pin 64. ing.

Here, in the refractory sheet 5, the portion sandwiched between the side surface of the backing member 12 and the angle steel 16 and the refractory coating material 18 is a non-foamed portion 5b that does not foam even when heated during a fire. Fire resistance is ensured by the fireproof coating material 18 provided so as to cover the steel 16.

5 (a) and 5 (b) show an example of the coating of the fireproof sheet 5 on the floor beam 2 and the mounting structure of the outer wall 9, and as shown in the drawing, the fireproof coating material is applied to the outer surface of the floor beam 2 made of channel steel. An outer wall 9 made of a refractory panel such as PALC (Precastable Autoclaved Lightweight Ceramics) is fixed by bolts 92 and 93 via a bracket 91.
A fireproof coating material 94 is fixed to the inner surface of the outer wall 9 above the floor beam 2 with a washer-integrated screw 95, and the fireproof coating material 94 is connected to the upper surface of the floor beam 2 with a washer-integrated welding pin 96.

Here, in the refractory sheet 5, the portion surrounded by the channel steel outer surface of the floor beam 2 and the outer wall 9 is a non-foamed portion 5c that does not foam even by heating at the time of fire, but the upper part thereof is the outer wall. Fire resistance is ensured by a fireproof coating material 94 provided so as to cover the bracket 91 to which the 9 is attached.
The ceiling beam 3 may be used instead of the floor beam 2.

As described above, if it is a building unit, it can be manufactured at the factory, and a fireproof sheet can also be attached at the factory.
Therefore, it is possible to reduce the fireproof coating work at the site of the unit type building.

(Modification example)
In the above embodiments, the channel steel forming the ceiling beam and the floor beam of the building unit is used, but the present invention is not limited to this, and the channel steel constituting the steel frame of the building is also used. Good.
In addition, it goes without saying that the specific detailed structure and the like can be changed as appropriate.

2 Floor beams (channel steel)
3 Ceiling beam (slot-shaped steel)
3a Reinforcing plate 5 Fireproof sheet 5a Overlapping margin part 5b Non-foaming part 5c Non-foaming part 6 Floor slab 6a Auxiliary floor slab 7 Ceiling beam 8 Ceiling plate 9 Outer wall 12 Backing member 12a Reinforcing plate 13 Backing member 13a Reinforcing plate 15 Glass Fiber Tape 16 Angle Steel 17 Bolt Nut 18 Fireproof Coating Material 61 Long Screw 62 Long Screw 63 Washer Integrated Screw 64 Washer Integrated Welding Pin 91 Bracket 92 Bolt 93 Bolt 94 Fireproof Coating Material 95 Washer Integrated Screw 96 Washer Integrated Welding Pin

Claims (6)

It is a structure in which channel steel that constitutes steel frames such as ceiling beams and floor beams of a building is covered with a fireproof sheet.
A backing member that projects outward from the open end is provided in the open end of the channel steel.
A refractory coating structure of a channel steel, wherein the refractory sheet is coated on the channel steel up to the backing member projecting outward from the open end. In the fireproof coating structure of channel steel according to claim 1,
The fireproof coating structure of the channel steel, wherein the stacking allowance portion of the fireproof sheet is located on the upper surface side of the channel steel. In the fireproof coating structure of channel steel according to claim 2.
A refractory coating structure of channel steel, characterized in that a reinforcing glass fiber tape is thermocompression bonded along the stacking margin portion of the refractory sheet. In the fireproof coating structure of channel steel according to any one of claims 1 to 3.
The backing member is a refractory coating structure of channel steel characterized in that it is formed of a steel plate having a U-shaped cross section. In the fireproof coating structure of channel steel according to any one of claims 1 to 4.
The channel steel is a refractory coating structure of the channel steel, characterized in that the open end is directed sideways and is arranged vertically. In the fireproof coating structure of channel steel according to any one of claims 1 to 5.
The channel steel is a fireproof coating structure of channel steel, characterized in that it is a ceiling beam and a floor beam of a building unit.

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