JP2021152261A - Floor structure - Google Patents

Abstract

To provide a floor structure allowing a floor slab to be thinner while suppressing increase of production cost.SOLUTION: A floor structure 1 is provided with: a floor slab 11 supported on a plurality of beams (steel beams 10); a ceiling joist receiver 12 extended in a first direction at a position apart downward from the floor slab 11; a pair of first bundle members 13 oblique upward from the first direction of the ceiling joist receiver 12 so as to apart from each other, being installed between a pair of beams apart from both end parts of the ceiling joist receiver 12 in the first direction to be connected to the ceiling joist receiver 12 and the beams with pins; and a pair of second bundle members 14 extending in a vertical direction from both end parts of the ceiling joist receiver 12 in the first direction, being installed between both end parts of the ceiling joist receiver 12 and the floor slab 11 to be connected to the ceiling joist receiver 12 and the floor slab 11 with pins.SELECTED DRAWING: Figure 2

Description

The present invention relates to a floor structure.

A floor structure including a floor slab composed of a prestressed concrete plate that curves downward in the tension direction is known (Patent Document 1). In this floor slab, since the load is supported by the tensile stress along the curved shape, the wall thickness of the floor slab can be reduced as compared with the flat floor slab that supports the load by the bending stress.

Japanese Unexamined Patent Publication No. 2001-182210

However, the floor slab made of prestressed concrete plate has a problem that the manufacturing cost is high.

In order to solve the above problems, the present invention provides a floor structure capable of thinning the floor slab while suppressing an increase in manufacturing cost.

The floor structure of the present invention includes a floor slab supported by a plurality of beams, a field slab extending downward from the floor slab in the first direction, and a field slab extending in the first direction. It is inclined upward from both ends so as to be separated from each other, and is erected between both ends of the field edge receiver and a pair of the beams separated in the first direction among the plurality of beams, and the field edge receiver is installed. A pair of first bundled materials pin-bonded to the beam and the field edge receiver, extending vertically from both ends in the first direction of the field edge receiver, and erected between both ends of the field edge receiver and the floor slab. A pair of second bundle members, which were pin-bonded to the field edge receiver and the floor slab, were provided.

In this case, the field edge extending in the second direction orthogonal to the first direction and connected to the lower surface of the field edge receiver and the field edge connected to the lower surface of the field edge receiver bear a tensile force together with the field edge receiver. A ceiling material may be further provided.

In this case, the upper end of the first bundle is pin-bonded to the beam via the first plate, and the lower end of the first bundle is pin-bonded to the field edge receiver via the common plate. The upper end of the second bundle is pin-bonded to the floor slab via the second plate, and the lower end of the second bundle is pin-bonded to the field edge receiver via the common plate. Auxiliary studs embedded in the floor slab may be erected on the upper surface of the second plate.

In this case, the field edge receiver may be suspended from the floor slab by a plurality of hanging bolts.

According to the present invention, it is possible to reduce the wall thickness of the floor slab while suppressing an increase in the manufacturing cost of the floor structure.

It is a top view which shows the 1st floor of the building which provided the floor structure which concerns on 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. It is sectional drawing which shows the part of the floor structure which concerns on 1st Embodiment of this invention in an enlarged manner. It is sectional drawing explaining the deformation of the floor structure which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the part of the floor structure which concerns on 2nd Embodiment of this invention in an enlarged manner.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this specification, in order to indicate the direction, an orthogonal coordinate system in a three-dimensional space in which the X direction, the Y direction, and the Z direction (vertical direction) are orthogonal to each other is used. In the present specification, the X direction is an example of the first direction, and the Y direction is an example of the second direction. In the present specification, terms indicating directions and positions are used, but these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

First, with reference to FIG. 1, the building 100 provided with the floor structure 1 according to the first embodiment will be briefly described. FIG. 1 is a plan view showing one floor of a building 100 having a floor structure 1.

The building 100 is a multi-story building and has a plurality of (four in FIG. 1) steel frame columns 101 erected at positions separated in the XY directions. Steel beams 10 are erected for each layer between the steel columns 101 adjacent to each other in the XY directions. The steel beam 10 is an H-shaped steel in which the upper flange 10A and the lower flange 10B are connected by a web 10C (see FIG. 3). Both ends of the steel beam 10 in the axial direction are fixed to the steel column 101 by welding, bolts, or the like. The end portions of the reinforced concrete floor slab 11 are supported on the upper surfaces of the four steel beam 10s in each layer to form the floor structure 1. The columns of the building 100 are not limited to the steel-framed steel-framed columns 101, and may be, for example, a reinforced concrete structure, a steel-framed reinforced concrete structure, a concrete-filled steel pipe structure, or the like. Further, the steel frame beam 10 is not limited to the H-shaped steel, and may be, for example, an I-shaped steel. Further, the beam is not limited to the steel beam 10, and may be, for example, a beam made of steel-framed reinforced concrete.

[First Embodiment: Floor structure]
The floor structure 1 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is an enlarged cross-sectional view showing a part of the floor structure 1. In this specification, attention will be paid to the floor structure 1 of one layer.

As shown in FIGS. 1 and 2, the floor structure 1 includes a floor slab 11, a plurality of field edge receivers 12, a plurality of first bundle members 13, and a plurality of second bundle members 14. .. A pair of the first bundle member 13 and the second bundle member 14 is provided for one field edge receiver 12. Unless otherwise specified, the present specification focuses on one field edge receiver 12 (a pair of first and second bundled lumbers 13, 14). Further, since the pair of the first and second bundle members 13 and 14 are arranged line-symmetrically in the X direction, the explanation will be given focusing on one first and second bundle members 13 and 14 unless otherwise specified. do.

<Floor slab>
The floor slab 11 is made of reinforced concrete in which slab bars (not shown) are embedded in concrete. For example, a plurality of studs or the like (not shown) are erected on the upper surface of the steel frame beam 10, and the floor slab 11 is supported on the upper surface of the plurality of steel frame beams 10 by embedding the studs or the like.

<Field edge reception>
The plurality of field edge receivers 12 are extended in the X direction at positions separated downward from the floor slab 11 (see FIG. 2). That is, the field edge receiver 12 is arranged so as to face each other with a space between it and the floor slab 11 (lower surface). The plurality of field edge receivers 12 are arranged at substantially equal intervals in the Y direction (see FIG. 1). The field edge receiver 12 is formed of structural lightweight shaped steel such as lightweight channel steel and lip channel steel, for example.

(Hanging bolt)
As shown in FIG. 2, the field edge receiver 12 is suspended from the floor slab 11 by a plurality of hanging bolts 21. The plurality of suspension bolts 21 are arranged at intervals in the X direction. The upper end of the hanging bolt 21 is connected to a slab-side hanging metal fitting (not shown) fixed to the floor slab 11 by a method such as screwing or welding. A hook-shaped hanging bracket 21A for fitting the field edge receiver 12 is attached to the lower end of the hanging bolt 21 (see FIG. 3). The field edge receiver 12 is connected to the hanging bolt 21 via the hanging metal fitting 21A.

(Field edge, ceiling material)
As shown in FIGS. 1 and 2, a plurality of field edges 22 extending in the Y direction are connected to the lower surface of the plurality of field edge receivers 12. The plurality of field edges 22 are arranged at substantially equal intervals in the X direction, and are fixed to the field edge receiver 12 by a clip or the like (not shown). The field edge 22 is made of structural lightweight shaped steel, like the field edge receiver 12, for example. The plurality of field edges 22 and the plurality of field edge receivers 12 are arranged orthogonal to each other to form a grid-like ceiling structure frame 20 (see FIG. 1). A plurality of ceiling materials 23 forming a finished surface of the ceiling of the living room are connected (fixed) to the lower surface of the field edge 22. The ceiling material 23 is, for example, a decorative board or the like, and is formed in a panel shape that is bridged between adjacent field edges 22.

The field edge receiver 12 and the field edge 22 may be one without a seam, but they are divided into a plurality of pieces in consideration of carrying into the construction site and construction workability, and joint members and the like are used at the construction site. May be spliced with (not shown).

<1st bundle material>
As shown in FIGS. 2 and 3, the pair of first bundle members 13 are inclined so as to be separated from each other upward from both ends of the field edge receiver 12 in the X direction, and are separated from both ends of the field edge receiver 12. It is erected between a pair of steel beams 10 separated in the X direction. The first bundle member 13 is made of structural lightweight shaped steel, like the field edge receiver 12, for example. The pair of first bundle members 13 are pin-bonded to the field edge receiver 12 and the steel frame beam 10. In this specification, pin joining refers to a joining method in which members are joined so that the nodes (joining portions) of the members rotate.

A first plate 15 (made of iron) is fixed to the steel beam 10 by welding, bolts, or the like. The first plate 15 is orthogonal to the web 10C and extends outward from the flanges 10A and 10B, respectively. A through hole (not shown) through which a fastening member 18 such as a bolt, a screw, or a rivet is passed is formed in the upper end portion of the first bundle member 13. The upper end portion of the first bundle member 13 is attached to the first plate 15 by the fastening member 18. That is, the upper end portion of the first bundle member 13 is pin-joined to the steel frame beam 10 via the first plate 15. On the other hand, common plates 16 (made of iron) are fixed to both ends of the field edge receiver 12 by welding or bolts or the like. The common plate 16 extends substantially vertically upward from the field edge receiver 12. The common plate 16 extends outward in the X direction from the end of the field edge receiver 12. A through hole (not shown) is formed at the lower end of the first bundle 13 to allow the fastening member 18 to pass through, and the lower end of the first bundle 13 is attached to the common plate 16 by the fastening member 18. That is, the lower end portion of the first bundle member 13 is pin-bonded to the field edge receiver 12 via the common plate 16.

<Second bundle material>
The pair of second bundle members 14 extend vertically from both ends of the field edge receiver 12 in the X direction and are erected between both ends of the field edge receiver 12 and the floor slab 11. The second bundle member 14, for example, is made of structural lightweight shaped steel like the first bundle member 13. The pair of second lumber 14s are pin-bonded to the field edge receiver 12 and the floor slab 11 (to be exact, the second plate 17 described later).

A second plate 17 (made of iron) is fixed to the floor slab 11. For example, the second plate 17 is formed in a substantially T-shape (or a substantially L-shape) by a horizontal portion forming an upper surface and a vertical portion extending substantially vertically downward from the horizontal portion. On the upper surface (horizontal portion) of the second plate 17, a plurality of auxiliary studs 17A (for example, studs with heads) embedded in the floor slab 11 are erected (see FIG. 3). That is, the second plate 17 is fixed to the floor slab 11 via a plurality of auxiliary studs 17A. A through hole (not shown) through which the fastening member 18 penetrates is formed in the upper end portion of the second bundle member 14, and the upper end portion of the second bundle member 14 is attached to the second plate 17 by the fastening member 18. That is, the upper end portion of the second bundle member 14 is pin-bonded to the floor slab 11 via the second plate 17. On the other hand, a through hole (not shown) through which the fastening member 18 penetrates is formed at the lower end portion of the second bundle member 14, and the lower end portion of the second bundle member 14 is attached to the common plate 16 by the fastening member 18. .. That is, the lower end portion of the second bundle member 14 is pin-bonded to the field edge receiver 12 via the common plate 16.

[Transmission of load capacity in floor structure]
Next, with reference to FIG. 4, the transmission of the load in the floor structure 1 according to the first embodiment will be described. FIG. 4 is a cross-sectional view illustrating the deformation of the floor structure 1. In FIG. 4, the field edge 22 and the ceiling material 23 are not shown in order to make it easier to understand the deformation of the floor structure 1. Further, in FIG. 4, the floor structure 1 before the deformation is shown by a broken line, and the floor structure 1 after the deformation is shown by a solid line. Further, FIG. 4 does not show the exact amount of deformation of the floor structure 1, but shows the amount of deformation exaggerated in order to make the deformation of the floor structure 1 easy to understand.

When a load is applied to the floor slab 11 (see the white arrow in FIG. 4), the floor slab 11 bends downward due to the load, and a compressive stress acts on the floor slab 11 (see the thick arrow in FIG. 4). The pair of first bundle members 13 rotate around the node between the first plate 15 and the common plate 16 and pull the field edge receiver 12 in the X direction (see the thick arrow in FIG. 4). As a result, tensile stress acts on the pair of first lumber 13 and the field edge receiver 12. Further, with the deformation of the floor slab 11 and the rotation of the pair of first bundle members 13, the pair of second bundle members 14 receive compressive stress while rotating around the node between the second plate 17 and the common plate 16. (See the thick arrow in FIG. 4). Since the first and second bundled lumbers 13 and 14 are pin-joined, the bending moment generated in the first and second bundled lumbers 13 and 14 and the field edge receiver 12 is negligibly small and large in the floor structure 1. It has no effect.

As described above, when the floor slab 11 receives the load, the floor slab 11 and the pair of the second bundle members 14 bear the compressive stress, and the pair of the first bundle members 13 and the field edge receiver 12 have a tensile component. Therefore, the rigidity of the floor structure 1 is improved. In other words, the floor slab 11 and the field edge receiver 12 can be regarded as forming one thick beam or one thick slab.

According to the floor structure 1 according to the first embodiment described above, the field edge receiver 12 which is a part of the frame supporting the ceiling material 23 can bear the tensile component of the load received by the floor slab 11. Therefore, the manufacturing cost can be reduced as compared with the floor slab made of prestressed concrete plate. Further, since the load applied to the floor slab 11 is transmitted by the axial force, the cross-sectional area of the floor slab 11, the field edge receiver 12, the first and second bundle members 13, 14 and the like is maintained while maintaining high load bearing performance. It can be made smaller. As a result, the floor slab 11 can be thinned while suppressing an increase in manufacturing cost. Further, according to the floor structure 1, since the floor slab 11 and the field edge receiver 12 can be regarded as forming one thick beam, the load bearing performance can be improved. Thereby, for example, in a building having a large span in which the distance between the column cores exceeds 10 m, the floor vibration can be reduced and the beam can be omitted. Although the beam is omitted in the floor structure 1, the beam may be erected between the opposing steel frame beams 10. Even in this case, according to the floor structure 1, the number of beams can be reduced as compared with the conventional floor structure without the first and second bundle members 13 and 14.

Further, in the floor structure 1 according to the first embodiment, the first and second bundle members 13 and 14 are pin-bonded to the plates 15 to 17, respectively. According to this configuration, when the floor slab 11 receives a load, the tensile stress can be appropriately transmitted to the first bundle member 13, and the compressive stress can be appropriately transmitted to the second bundle member 14. can.

Further, according to the floor structure 1 according to the first embodiment, the space between the floor slab 11 and the floor slab 11 (the height of the ceiling) is adjusted by suspending the field edge receiver 12 by the hanging bolt 21 as in the conventional case. However, the field edge holder 12 can be hung.

[Second Embodiment]
Next, the floor structure 2 according to the second embodiment will be briefly described with reference to FIG. FIG. 5 is an enlarged cross-sectional view showing a part of the floor structure 2. In the following description, the same components as the floor structure 1 according to the first embodiment are designated by the same reference numerals, and the same description as the floor structure 1 according to the first embodiment will be omitted.

In the floor structure 1 according to the first embodiment, the ceiling material 23 is a decorative board or the like having no tensile proof stress, but in the floor structure 2 according to the second embodiment, the ceiling material 24 has a tensile proof stress. It's different.

The ceiling material 24 is formed in a panel shape using a material having high tensile strength, such as an iron plate, fiber reinforced plastic (glass fiber, carbon fiber, aramid fiber, etc.) or a composite material thereof. The ceiling material 24 is fixed to the lower surface of the field edge 22, and bears a tensile force together with the field edge receiver 12. That is, in addition to the floor slab 11, the field edge receiver 12, the first bundle member 13 and the second bundle member 14, the field edge 22 and the ceiling material 24 are also constituent members of the floor structure 2.

According to the floor structure 2 according to the second embodiment described above, the ceiling material 24 is integrated with the field edge receiver 12 via the field edge 22, and bears the tensile component of the load received by the floor slab 11. can. As a result, it is possible to obtain the same effect as the floor structure 1 according to the first embodiment described above, such as reducing the wall thickness of the floor slab 11 while suppressing an increase in manufacturing cost.

In the floor structures 1 and 2 according to the first and second embodiments, a pair of first bundle members 13 and a pair of second bundle members 14 are provided on all the field edge receivers 12. Not limited to this, it may be provided only in a part of the field edge receiver 12. For example, the field edge receiver 12 provided with the first and second bundle members 13 and 14 and the field edge receiver 12 not provided with the first and second bundle members 13 and 14 are alternately arranged side by side in the Y direction. May be (not shown).

Further, when the distance between the pair of steel beams 10 in the X direction is long, or when three or more steel beams 10 are arranged side by side in the X direction, the field edge receivers provided with the first and second bundle members 13 and 14 are provided. A plurality of 12's may be arranged side by side in the X direction (not shown). In this case, a pair of first plates 15 are fixed on both sides in the X direction to the steel beam 10 to which two adjacent field edge receivers 12 are attached.

In the floor structures 1 and 2 according to the first and second embodiments, the upper end portion of the first bundle member 13 is connected to the steel frame beam 10 via the first plate 15, but the present invention is not limited to this. It may be directly connected to the steel beam 10 (not shown). Similarly, the lower ends of the first bundle member 13 and the second bundle member 14 were connected to the field edge receiver 12 via the common plate 16, but the present invention is not limited to this, and the lower end portion is directly connected to the field edge receiver 12. They may be concatenated (not shown). Further, the lower end portions of the first bundle lumber 13 and the second bundle member 14 may be connected to the field edge receiver 12 via different plates (not shown).

Further, in the floor structures 1 and 2 according to the first and second embodiments, the first and second bundle members 13 and 14 are formed of the same structural lightweight shaped steel as the field edge receiver 12. The first and second bundle members 13 and 14 may be made of a steel material different from that of the field edge receiver 12. Further, the first bundle member 13 and the second bundle member 14 may be formed of different materials from each other. The field edge receiver 12, the first bundle member 13, and the second bundle member 14 are not limited to the structural lightweight shaped steel, and may be any structural material that mainly has a tensile strength.

Further, in the floor structures 1 and 2 according to the first and second embodiments, the hanging bolts 21 are provided, but the ceiling structure frame 20 including the field edge receiver 12 is provided by the first and second bundle members 13 and 14. If it can be supported, the hanging bolt 21 may be omitted (deleted). Further, since the strength of the ceiling structure frame 20 is increased by the first and second bundle members 13 and 14, the number of hanging bolts 21 is increased as compared with the conventional ceiling structure frame without the first and second bundle members 13 and 14. May be reduced. Further, for example, in order to prevent the ceiling structure frame 20 from shaking significantly due to an earthquake or the like, a pair of braces may be erected between adjacent hanging bolts 21 (not shown). Each brace may be pin-joined to the suspension bolt 21, for example, in an inclined posture so as to approach each other from the lower part to the upper part.

Further, in the floor structures 1 and 2 according to the first and second embodiments, the floor slab 11 is made of reinforced concrete, but the present invention is not limited to this, for example, a synthetic deck floor slab including reinforced concrete and a deck plate. May be (not shown).

The description of the embodiment shows one aspect of the floor structure according to the present invention, and the technical scope of the present invention is not limited to the above embodiment. The present invention may be variously modified, replaced or modified without departing from the spirit of the technical idea, and the claims include all embodiments that may be included within the scope of the technical idea.

1, 2 Floor structure 10 Steel beam (beam)
11 Floor slab 12 Field edge holder 13 1st bundle material 14 2nd bundle material 15 1st plate 16 Common plate 17 2nd plate 17A Auxiliary stud 21 Hanging bolt 22 Field edge 23,24 Ceiling material

Claims (4)

Floor slabs supported by multiple beams and
A field edge holder extending in the first direction at a position separated downward from the floor slab,
The both ends of the field edge receiver are inclined upward from both ends in the first direction so as to be separated from each other, and the pair of the beam separated in the first direction from the plurality of beams. A pair of first bundle members erected between them and pin-joined to the field edge receiver and the beam,
A pair extending vertically from both ends of the field edge receiver in the first direction, erected between both ends of the field edge receiver and the floor slab, and pin-bonded to the field edge receiver and the floor slab. The floor structure is characterized by being provided with the second bundle material of. A field edge extending in a second direction orthogonal to the first direction and connected to the lower surface of the field edge receiver,
The floor structure according to claim 1, further comprising a ceiling material connected to the lower surface of the field edge and bearing a tensile force together with the field edge receiver. The upper end of the first bundle is pin-joined to the beam via the first plate.
The lower end of the first bundle lumber is pin-bonded to the field edge holder via a common plate.
The upper end of the second bundle is pin-bonded to the floor slab via the second plate.
The lower end of the second bundle is pin-bonded to the field edge holder via the common plate.
The floor structure according to claim 1 or 2, wherein an auxiliary stud embedded in the floor slab is erected on the upper surface of the second plate. The floor structure according to any one of claims 1 to 3, wherein the field edge receiver is suspended from the floor slab by a plurality of hanging bolts.

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