JP6987738B2 - Floor structure - Google Patents

Description

The present invention relates to a floor structure in which a synthetic floor slab composed of a reinforced concrete floor and a wooden floor plate located below the reinforced concrete floor is arranged on a steel beam, and the steel beam is covered with a fireproof coating material.

As the above-mentioned floor structure, for example, there is a floor structure disclosed in FIG. 10 of Patent Document 1. In this floor structure, an orthogonal laminated wood, which is a wooden floor plate, is hung on the upper surface of a steel beam made of H-shaped steel, and concrete is placed on the orthogonal laminated wood to construct a reinforced concrete floor. ..

JP-A-2017-78307

Since the synthetic floor slab of the above-mentioned floor structure is a structure in which a reinforced concrete floor and a wooden floor plate located below the reinforced concrete floor are joined, the weight can be reduced as compared with a floor structure composed of only the reinforced concrete floor, and the wood is made of wood. Fire resistance and soundproofing performance are improved compared to a floor structure consisting only of floorboards.
On the other hand, if the wooden floor board of the synthetic floor slab is burnt down in the event of a fire, the upper surface of the steel beam is exposed, which causes a problem that the strength of the steel beam is lowered in a short time.

In view of this situation, a main object of the present invention is to provide a floor structure capable of improving the fire resistance performance of the steel beam in the event of a fire by rationalizing the temporary support structure of the wooden floor plate for the steel beam. ..

The first characteristic configuration of the present invention is a floor structure in which a synthetic floor slab composed of a reinforced concrete floor and a wooden floor plate located below the reinforced concrete floor is arranged on a steel beam, and the steel beam is covered with a fireproof coating material. And,
A temporary support member is provided on the upper surface of the steel beam to temporarily support the wooden floor plate in a non-contact or substantially non-contact state with the steel beam, and the upper surface of the steel beam provided with the temporary support member is a reinforced concrete floor. The point is that the part is covered with a concrete layer, and the outer surface of the beam other than the upper surface of the steel frame beam is covered with the fireproof coating material.

According to the above configuration, by temporarily supporting the wooden floor plate in a non-contact or substantially non-contact state with the temporary support member provided on the upper surface of the steel frame beam, the entire upper surface of the steel frame beam provided with the temporary support member or Almost the entire area can be covered with a concrete layer on the reinforced concrete floor. As a result, even if the wooden floor plate is burnt down in the event of a fire, it is possible to avoid or substantially avoid exposing the upper surface of the steel beam, and the outer surface of the beam other than the upper surface of the steel beam is covered with a fireproof coating material. Therefore, the fire resistance performance of the steel beam in the event of a fire can be improved.

In the second characteristic configuration of the present invention, the temporary support member includes a metal mounting member having a mounting surface with respect to the side surface of the wooden floor plate, and the mounting member is outside from the outer edge in the width direction on the upper surface of the steel frame beam. The point is that it is provided so as to protrude toward the direction.

According to the above configuration, the metal mounting member having the mounting surface with respect to the side surface of the wooden floor plate is arranged so as to project outward from the outer edge in the width direction on the upper surface of the steel frame beam, thereby interposing the space between the wood floor plate and the steel frame beam. , It is possible to surely make a non-contact state by separating only the protrusion margin of the mounting member. Moreover, since the metal mounting member is in contact with the reinforced concrete floor portion 2 having a large mass, the temperature does not rise to such an extent that it is burnt down in the event of a fire, and the fireproof shielding function for the upper surface of the steel frame beam is maintained.

The third characteristic configuration of the present invention is that the mounting member is composed of an angle member arranged along the outer edge in the width direction on the upper surface of the steel frame beam.

According to the above configuration, the lumber floorboard is arranged outwardly from the outer edge in the width direction on the upper surface of the steel frame beam by the angle material protruding outward from the outer edge in the width direction on the upper surface of the steel frame beam. The gap between the side surface of the wooden floorboard and the outer edge in the width direction on the upper surface of the steel beam can be filled with the angle material. Therefore, it is possible to utilize the angle material for temporarily supporting the wooden floor plate in a non-contact or substantially non-contact state with the steel frame beam as the formwork, and reduce the temporary formwork when constructing the reinforced concrete floor portion.

A vertical sectional view showing a first embodiment of the floor structure of the present invention. Enlarged vertical cross-sectional view of the main part A vertical sectional view showing a second embodiment of the floor structure of the present invention. Enlarged vertical cross-sectional view of the main part

An embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
In FIG. 1, a synthetic floor slab 4 composed of a reinforced concrete floor portion 2 and a wooden floor plate 3 located below the reinforced concrete floor portion 2 is arranged on a steel beam 1 made of H-shaped steel, and the outer surface of the beam excluding the upper surface 1a of the steel beam 1 is arranged. The floor structure of a building in which 1c is coated with a fireproof coating material 5 such as sprayed rock wool is shown. In FIG. 1, only one steel frame beam 1 is shown for convenience, but a plurality of the steel frame beams 1 are arranged at predetermined intervals along two orthogonal directions, and the wood floor board 3 of the synthetic floor slab 4 has a plurality of pieces. It is temporarily supported by the steel beam 1 in a horizontal position.

As the wood floor board 3, a rectangular single board laminated material is used in this embodiment. In this single plate laminated material, for example, both outer surface layers located on the outermost side in the thickness direction form a parallel one layer whose fiber direction is parallel to the long side of the single plate laminated material, and the inner first layer following both outer surface layers. The two layers form one orthogonal layer whose fiber direction is orthogonal to the long side, and the other plurality of intermediate layers are formed of parallel layers whose fiber directions are the same as those of both outer layers. Incidentally, the veneer laminated material may be configured as parallel layers in which all layers are in the same direction.
Of the front and back surfaces of the veneer laminated lumber, the surface surface (lower surface) that does not come into contact with the reinforced concrete floor portion 2 is formed as a finished surface (decorative surface). In other words, the wood floor board 3 is composed of a finishing material.
As the wood floor board 3, appropriate wood such as orthogonal laminated wood or laminated wood other than the veneer laminated material can be used.

As shown in FIG. 1, slab bars 21 are arranged along two orthogonal directions on the upper side of the wooden floor plate 3, and a reinforced concrete floor is placed at the intermediate portion in the width direction of the upper surface 1a in the upper flange 1A of the steel frame beam 1. Studs 22 that enhance the integrity with the portion 2 are provided, and shear keys 23 such as lug screws and coach screws that enhance the integrity with the reinforced concrete floor portion 2 are provided at a plurality of locations on the back surface (upper surface) of the wooden floor plate 3. ing. In this state, concrete is cast on the upper surface 3a of the wooden floor plate 3 and the upper surface 1a of the steel frame beam 1 to construct the reinforced concrete floor portion 2.
Since the wooden floor board 3 not only functions as a structural member but also is used as a formwork that does not need to be removed during construction, it is possible to reduce the temporary formwork when constructing the reinforced concrete floor portion 2.

In the floor structure shown in FIGS. 1 and 2, a temporary support member 6 is provided on the upper surface 1a of the steel frame beam 1 to temporarily support the wooden floor plate 3 in a non-contact or substantially non-contact state with the steel frame beam 1. As shown in FIG. 2, the temporary support member 6 is composed of an angle member (equal angle steel or unequal angle steel) 7 which is an example of a metal mounting member having a mounting surface 7a with respect to the side surface 3b of the wooden floor plate 3. Has been done. One flange 7B of the angle member 7 is in a posture along the widthwise outer edge 1b on the upper surface 1a of the steel frame beam 1 and is in a state of protruding outward from the widthwise outer edge 1b on the upper surface 1a of the steel frame beam 1. It is joined by an appropriate joining means such as welding. The protrusion allowance of the angle member 7 is, for example, the same as or substantially the same as the thickness of the fireproof coating material 5 to be coated on the beam outer surface 1c other than the upper surface 1a of the steel frame beam 1. The protrusion allowance of the angle material 7 may be smaller or larger than the thickness of the refractory coating material 5. In short, the protrusion allowance of the angle member 7 can be appropriately set according to various conditions.

With the above configuration, the wooden floor plate 3 is reliably placed in a non-contact state with the upper surface 1a of the steel frame beam 1 at a position separated outward by the protrusion margin of the angle member 7 from the outer edge 1b in the width direction of the upper surface 1a of the steel frame beam 1. Can be provisionally supported. Moreover, as shown in FIG. 2, the gap between the side surface 3b of the wooden floor plate 3 and the outer edge 1b in the width direction of the upper surface 1a of the steel frame beam 1 can be filled with the angle material 7, so that the cast concrete can be filled from the gap. It will not leak. Therefore, by utilizing the angle material 7 for temporarily supporting the wooden floor plate 3 in a non-contact state with the steel frame beam 1 as a formwork, it is possible to reduce the temporary formwork when constructing the reinforced concrete floor portion 2. can.

As shown in FIG. 2, the height of the mounting surface 7a formed by the outer surface of the other flange 7A of the angle member 7 is, for example, the same as or substantially the same as the plate thickness of the wooden floor plate 3, and the flange 7A has the same height. Is provided with a plurality of temporary screws 8 that support the side surface 3b of the wooden floor board 3. The height of the mounting surface 7a may be smaller or larger than the thickness of the wooden floor board 3. In short, the height of the mounting surface 7a can be appropriately set according to various conditions.

Then, in the present embodiment, as described above, the wooden floor plate 3 is temporarily supported at a position separated outward by the protrusion margin of the angle member 7 from the outer edge 1b in the width direction of the upper surface 1a of the steel frame beam 1 in a non-contact state. Therefore, the entire upper surface 1a of the steel frame beam 1 provided with the angle member 7 can be covered with the concrete layer 20 of the reinforced concrete floor portion 2. As a result, even if the wooden floor plate 3 is burnt down in the event of a fire, the upper surface 1a of the steel frame beam 1 is fire-shielded by the concrete layer 20 and the angle material 7 of the reinforced concrete floor portion 2, and the upper surface 1a of the steel frame beam 1 is exposed. No. Further, since the angle material 7 serving as a fire-resistant shielding material for the upper surface 1a of the steel frame beam 1 is in contact with the reinforced concrete floor portion 2 having a large mass, the temperature does not rise to such an extent that it is burnt down in the event of a fire, and the temperature of the angle material 7 does not rise to the extent that it burns down in the event of a fire. Fireproof shielding function is maintained. Further, since the beam outer surface 1c other than the upper surface 1a of the steel frame beam 1 is covered with the fireproof coating material 5, the fire resistance performance of the steel frame beam 1 in the event of a fire can be improved.

[Second Embodiment]
In the floor structure of another embodiment shown in FIGS. 3 and 4, a temporary support member 6 for temporarily supporting the wooden floor plate 3 in a substantially non-contact state with the steel frame beam 1 is provided on the upper surface 1a of the steel frame beam 1. The temporary support member 6 is a steel erection support base 61 joined to the central portion of the upper surface 1a of the steel frame beam 1 in the width direction by an appropriate joining means such as welding along the beam longitudinal direction, and the side surface of the wooden floor plate 3. A plurality of reinforcing bar engagement support members 62 that engage with the engagement holes 3c formed at the plurality of temporary support positions of 3b from the width direction of the steel frame beam 1 are provided. The engaging support member 62 is appropriately welded or the like in a state of projecting outward from the outer edge 1b in the width direction on the upper surface 1a of the steel frame beam 1 at a plurality of temporary support positions in the beam longitudinal direction on the upper surface of the erection support base 61. It is joined by a joining means.
As shown in FIG. 4, in the temporary support state in which the protruding end portion 62a of the engagement support member 62 is engaged with the engagement hole 3c of the side surface 3b of the wooden floor plate 3, the outer edge 1b in the width direction on the upper surface 1a of the steel beam 1 The edge of the wooden floor plate 3 and the edge of the lower end edge 3d of the side surface 3b of the wooden floor plate 3 are set to be in a substantially non-contact state in close or line contact.

The upper surface 1a of the steel frame beam 1 is covered with the concrete layer 20 of the reinforced concrete floor portion 2, and the beam outer surface 1c other than the upper surface 1a of the steel frame beam 1 is covered with the fireproof coating material 5. Therefore, when the wooden floor plate 3 is burnt down during a fire, the edge of the outer edge 1b in the width direction on the upper surface 1a of the steel frame beam 1 and the edge of the lower end edge 3d on the side surface 3b of the wooden floor plate 3 are in close proximity to each other. The upper surface 1a of the steel beam 1 is fire-proofed by the concrete layer 20 of the reinforced concrete floor 2, and the upper surface 1a of the steel beam 1 is not exposed. Further, in a state where the edge of the outer edge 1b in the width direction on the upper surface 1a of the steel frame beam 1 and the edge of the lower end edge 3d on the side surface 3b of the wooden floor plate 3 are in line contact, the outer edge in the width direction on the upper surface 1a of the steel frame beam 1 is in line contact. Although the edge of 1b may be exposed linearly, substantially the entire area of the upper surface 1a of the steel frame beam 1 is in a state of being fireproof shielded by the concrete layer 20 of the reinforced concrete floor portion 2.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

[Other embodiments]
In the above-mentioned first embodiment, the metal mounting member having the mounting surface 7a with respect to the side surface 3b of the quality floor plate 3 is composed of the angle member 7, but other shaped steel such as channel steel or Z-shaped steel or a build. It may be composed of H material (steel assembly material) or the like.

1 Steel beam 1a Upper surface 1b Width outer edge 1c Beam outer surface 2 Reinforced concrete floor 3 Wood floor board 4 Synthetic floor slab 5 Fireproof coating material 6 Temporary support member 7 Mounting member (angle material)
7a Mounting surface 20 Concrete layer

Claims (3)

A floor structure in which a synthetic floor slab consisting of a reinforced concrete floor and a wooden floor plate located below it is placed on a steel beam, and the steel beam is covered with a fireproof coating material.
A temporary support member is provided on the upper surface of the steel beam to temporarily support the wooden floor plate in a non-contact or substantially non-contact state with the steel beam, and the upper surface of the steel beam provided with the temporary support member is a reinforced concrete floor. A floor structure in which the outer surface of the beam other than the upper surface of the steel frame beam is covered with the fireproof coating material. The temporary support member includes a metal mounting member having a mounting surface with respect to the side surface of the wooden floor plate, and the mounting member is provided so as to project outward from the outer edge in the width direction on the upper surface of the steel frame beam. The floor structure according to claim 1. The floor structure according to claim 2, wherein the mounting member is composed of an angle member arranged along the outer edge in the width direction on the upper surface of the steel frame beam.

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