Deck slab

Abstract

To restrain outersurface bending deformation of a folded plate in a deck slab configured by the folded plate and concrete.SOLUTION: A deck slab 100 comprises: a deck plate 120 bridged between beams 10 and configured by a steel folded plate where groove shaped crest parts 124 and trough parts 122 are formed alternately in a width direction; wooden plates 110 provided under the deck plate 120, fastened with screws 90 across undersurfaces of two or more trough parts 122, and exhibiting a stiffening effect relative to outersurface bending deformation of the deck plate 120; and a concrete part 130 provided over the deck plate 120.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a deck slab. [Background technology]

[0002] Patent Document 1 discloses a technology related to a floor structure formed by placing a floor panel on a floor structural surface including at least a pair of floor beams arranged opposite each other in the horizontal direction. In this prior art, a floor panel is formed by placing a plurality of rows of stress dispersion members made of steel plates between an upper surface material made of a flat wooden board and a lower surface material made of a flat steel plate, and the floor panel is placed on a floor structural surface including at least a pair of floor beams (girders) arranged opposite each other in the horizontal direction, and the edge of the lower surface material is connected to the floor beams. The stress dispersion members have a trapezoidal hat-shaped cross section consisting of a horizontal top surface portion extending with a uniform width, a pair of inclined surfaces extending diagonally downward outward from both side edges of the top surface portion, and a pair of leg pieces extending horizontally outward from the lower edge of each inclined surface portion, and are arranged in parallel to each other at a distance from each other over the entire space between the floor beams, with the top surface portion connected to the lower surface of the upper surface material and the leg pieces placed horizontally slidably on the upper surface of the lower surface material.

[0003] Patent Document 2 discloses a technology related to a lightweight floor structure of a building such as a house. In this prior art, the floor structure uses a structural plate including a metal folded plate having a corrugated shape in which peaks and valleys are connected in the longitudinal direction, a base plate joined to the peaks of the metal folded plate, and a bottom plate joined to the valleys of the metal folded plate. At both ends of the structural plate, both ends of the metal folded plate are folded toward the base plate and joined to the base plate, the structural plates are arranged with a wider interval than the interval between the peaks of the metal folded plate, and the structural plates are connected by a connecting base plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-33298 A [Patent Document 2] JP 2004-60306 A Summary of the Invention [Problem to be solved by the invention]

[0005] Deck slabs made of folded plates and concrete are known. Folded plates have low resistance in the width direction perpendicular to the folding reinforcement direction, and are prone to out-of-plane bending deformation. For example, if the deck slab's deflection due to its own weight increases due to out-of-plane bending deformation, this can become an obstacle to making the span larger.

[0006] In view of the above, an object of the present invention is to suppress out-of-plane bending deformation of a folded plate in a deck slab composed of a folded plate and concrete. [Means for solving the problem]

[0007] The first aspect is a deck slab comprising: a steel folded plate that is hung between beams and has groove-shaped peaks and valleys formed alternately in the width direction; a wooden member that is provided under the folded plate and joined across the undersides of two or more of the valleys, and that exhibits a stiffening effect against out-of-plane bending deformation of the folded plate; and a concrete section provided on the folded plate.

[0008] According to the first embodiment of the deck slab, the out-of-plane bending deformation of the folded plate is suppressed by the wooden members which have a stiffening effect against the out-of-plane bending deformation of the folded plate, thereby suppressing deflection of the deck slab due to its own weight, etc.

[0009] A second aspect is a deck slab according to the first aspect, in which the wooden member does not have an impermeable coating film formed on the surface, or an impermeable coating film is formed on the upper surface but not on the lower surface.

[0010] According to the second embodiment of the deck slab, when an impermeable coating film is not formed on the surface, even if moisture penetrates into the wooden component from the upper surface thereof, the moisture is less likely to remain within the wooden component compared to when an impermeable coating film is formed on the underside thereof, thereby suppressing corrosion of the wooden component.

[0011] Alternatively, when the impermeable coating is formed on the upper surface but not on the lower surface, moisture is less likely to penetrate into the wooden component from the upper surface. Even if moisture does penetrate into the wooden component, it is less likely to remain inside the wooden component compared to when the impermeable coating is formed on the lower surface, so corrosion of the wooden component is suppressed.

[0012] A third aspect is a deck slab according to the first or second aspect, in which the beam does not have a rest portion on which the end of the wooden member is rested.

[0013] According to the deck slab of the third embodiment, the effort required for providing a resting portion on the beam is reduced.

[0014] A fourth aspect is a deck slab according to the first or second aspect, in which the ends of the wooden members are rested on and joined to joining members joined to the beams.

[0015] According to the fourth embodiment of the deck slab, the ends of the wooden members are rested on and joined to the joining members which are joined to the beams, thereby increasing the degree of fixation and suppressing deflection of the deck slab due to its own weight, etc. Effect of the Invention

[0016] According to the present invention, it is possible to suppress out-of-plane bending deformation of a folded plate in a deck slab composed of folded plates and concrete. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a cross-sectional view of the deck slab of the embodiment taken along the X direction. [Diagram 2] FIG. 2 is a cross-sectional view of the deck slab of the embodiment taken along the Y direction. [Diagram 3] FIG. 3 is an enlarged cross-sectional view of a main part of FIG. 2. [Figure 4] This is a process diagram showing the deck slab construction process in a cross section along the X direction. [Diagram 5] FIG. 2 is a process diagram showing the deck slab construction process in an oblique view. [Figure 6] 2 is an enlarged cross-sectional view of an end portion of the wooden board of FIG. 1. [Figure 7] FIG. 4 is a cross-sectional view corresponding to FIG. 3 taken along the Y direction of the deck slab of the first modified example. [Figure 8] FIG. 2 is a cross-sectional view corresponding to FIG. 1 taken along the X direction of a deck slab of a second modified example. [Figure 9] FIG. 5 is a process diagram corresponding to FIG. 4 , showing a cross section along the X direction, illustrating a construction process of the deck slab of the third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] <Embodiment> An embodiment of the deck slab of the present invention will be described. The two directions perpendicular to the horizontal direction are the X direction and the Y direction, which are indicated by the arrows X and Y, respectively. The vertical direction perpendicular to the X direction and the Y direction is the Z direction, which is indicated by the arrow Z.

[0019] [structure] First, the structure of the deck slab of this embodiment will be described.

[0020] As shown in Figures 1, 2 and 3, the deck slab 100 of this embodiment constituting a building 50 has a structure in which a deck plate 120 made of a steel folded plate, a wooden board 110 as an example of a wooden member that exhibits a stiffening effect against out-of-plane bending deformation of the deck plate 120, and a concrete section 130 are integrated together.

[0021] The wooden board 110 of this embodiment is made of Cross Laminated Timber (CLT), but is not limited thereto. The wooden board 110 may be, for example, Laminated Veneer Lumber (LVL) or solid wood.

[0022] The deck slab 100 is supported by beams 10 (see FIG. 1) and beams 20 (see FIG. 2). The beams 10 (see FIG. 1) and beams 20 (see FIG. 2 and FIG. 3) are arranged in a lattice pattern in a plan view, and their ends are joined to columns (not shown) that form the skeleton of the building 50.

[0023] The beams 10 shown in Fig. 1 are arranged along the Y direction and are spaced apart in the X direction (see also Fig. 5). The beams 20 shown in Fig. 2 are arranged along the X direction and are spaced apart in the Y direction. As shown in Fig. 1, the beam 10 of this embodiment is a steel beam made of an H-shaped steel having upper and lower flanges 14, 16 and a web 12. Similarly, as shown in Fig. 2, the beam 20 of this embodiment is a steel beam made of an H-shaped steel having upper and lower flanges 24, 26 and a web 22. The beams 10 and 20 are fire-resistant coated.

[0024] As shown in Fig. 1, the wooden boards 110 are fixed across the beams 10 (see also Figs. 5(A), 5(B) and 6). As shown in Fig. 2, the wooden boards 110 are arranged at intervals L in the Y direction, which is the beam direction of the beams 10 (see also Figs. 5(A) and 5(B)).

[0025] In this embodiment, the wooden board 110 does not have an impermeable coating film formed on the entire surface thereof. In other words, the wooden board 110 does not have an impermeable coating film formed on the lower surface 110L, the upper surface 110U, and the end surfaces 110T (see FIG. 6).

[0026] The impermeable coating film is a coating film formed by applying paint such as New Breed, GAF, Baton, WG5, and Osmo Color. Even if it is a water-based paint, if it becomes impermeable when dried, it is an impermeable coating film. However, water-permeable paint such as water-based stain, Briwax, and Neostain may be applied.

[0027] As shown in Figures 1 and 6, in this embodiment, the upper side 152 (see Figure 6) of a steel connecting member 150 made of a Z-shaped metal fitting is joined by welding or the like to the upper surface of the upper flange 16 of the beam 10 made of an H-shaped steel.

[0028] In this embodiment, a reinforcing plate 18 is joined, or welded in this embodiment, to the underside of the flange 16 of the beam 10 and the web 12. The reinforcing plate 18 is a plate-like member made of steel and elongated in the Y direction, with the plate thickness direction being in the Z direction. The length of the reinforcing plate 18 in the Y direction is the same as the length of the beam 10. The end of the reinforcing plate 18 in the X direction is in contact with or close to the joining member 150. The shape of the reinforcing plate 18 is an example and is not limited thereto. The reinforcing plate 18 does not have to be joined.

[0029] The end 114 of the wooden board 110 is placed on the lower side 154 (see FIG. 6) of the connecting member 150 and joined from below with a screw 92. The screw 92 in this embodiment is a wood screw. The connecting member 150 is fireproof coated like the beam 10. The gap between the connecting member 150 and the end face 110T (see FIG. 6) of the wooden board 110 is filled with a fireproof filler 32. The fireproof filler 32 is rock wool, fireproof putty, fireproof sealant, etc. The fireproof filler 32 is not necessary.

[0030] The configuration and joining method of the joining member 150 shown in FIGS. 1 and 6 are merely examples, and the present invention is not limited to these.

[0031] As shown in Figures 1 to 3, a deck plate 120 is placed on top of the beams 10 and the wooden boards 110. In this embodiment, as shown in Figures 2 and 5(C), the deck plates 120 are arranged without any gaps, and the wooden boards 110 are not exposed when viewed from above.

[0032] As shown in Figures 2 and 3, the deck plate 120 of this embodiment is constructed from a corrugated steel folded plate that is placed across the beams and has groove-shaped peaks 124 and valleys 122 alternately formed in the width direction (see also Figures 5(B) and 5(C)). From another perspective, the peaks 124 are trapezoids with a convex upper side, and the valleys 122 are trapezoids with an open upper side. The width direction of the deck plate 120 is the Y direction that is perpendicular to the X direction, which is the folding line direction, in a plan view.

[0033] In this embodiment, the end 126 of the deck plate 120 is joined, such as by welding, to a joining member 150 or to the flange 16 of the beam 10 .

[0034] The wooden board 110 at the bottom 123 (see FIG. 3) of the concave valley portion 122 of the deck plate 120 is fastened from above with screws 90 (see FIG. 3) (see also FIG. 1). In each valley portion 122, the screws 90 are arranged in multiple rows (two rows in this embodiment) spaced apart in the Y direction, with the rows of screws 90 aligned in the X direction (see FIG. 1). The end portion 114 of the wooden board 110 joined to the lower side 154 of the joining member 150 with screws 92 is also joined from above with screws 90.

[0035] 3, in this embodiment, the wooden board 110 is fastened by screws 90 across the undersides of the bottoms 123 of the two valleys 122 in the deck plate 120, but this is not limited thereto. It is sufficient that the wooden board 110 is fastened by screws 90 across the undersides of the bottoms 123 of two or more valleys 122.

[0036] In this embodiment, the screws 90 are wood screws, and are not shown in FIG.

[0037] As shown in Figs. 1 to 3, concrete is poured and hardened on the deck plate 120 to form the concrete portion 130. As shown in Fig. 1, reinforcing bars 60, 62 are arranged in the concrete portion 130. In this embodiment, the reinforcing bars 60 are main reinforcing bars, and the reinforcing bars 62 are distribution reinforcing bars. Note that the reinforcing bars 60, 62 are omitted from illustrations other than Fig. 1 to avoid complicating the drawings. The reinforcing bars arranged in the concrete portion 130 may have any configuration, for example, a configuration in which the main reinforcing bars and distribution reinforcing bars are supported by truss reinforcing bars. Reinforcing bars may be arranged in the valley portion 122 of the deck plate 120 along the X direction.

[0038] As shown in Fig. 3, in this embodiment, the upper end 72 of the hanging bolt 70 penetrates the upper surface 125 of the peak portion 124 of the deck plate 120 and is fastened with a nut 74 and fixed to the concrete portion 130. The hanging bolt 70 is suspended through the space L between the wooden boards 110 (see also Fig. 2). A ceiling board, a T-bar, and the like (not shown) are attached to the lower end of the hanging bolt 70.

[0039] [Construction method] Next, an example of a method for constructing the deck slab of this embodiment will be described.

[0040] As shown in FIG. 5(A), an upper side 152 of a joining member 150 is joined to the upper flange 16 of the beam 10 by welding or the like (see also FIG. 4(B)).

[0041] As shown in Figures 4(A), 4(B) and 5(A), a wooden board 110 is lifted with a crane or the like and placed on the lower side 154 of the joining member 150, and the wooden board 110 is hung across the beam 10 (see also Figure 6). An end 114 (see Figure 6) of the wooden board 110 is joined to the lower side 154 of the joining member 150 with a screw 92 (see Figure 6). In addition, the gap between the joining member 150 and the end face 110T (see Figure 6) of the wooden board 110 is filled with a fireproof filler 32. As mentioned above, the fireproof filler 32 is not necessary.

[0042] As shown in FIGS. 5(A) and 5(B), the wooden boards 110 are arranged at intervals L in the Y direction.

[0043] As shown in Figures 4(C), 5(B), and 5(C), the deck plate 120 is placed on the beams 10 and the wooden boards 110 by a crane or the like. In this embodiment, the deck plate 120 is pre-attached with the hanging bolts 70 (see Figure 3).

[0044] As shown in Fig. 4(D), a worker (not shown) fastens the deck plate 120 and the wooden board 110 together with screws 90 from above the deck plate 120 to integrate them (see also Figs. 1 to 3). In addition, the end 126 of the deck plate 120 is joined to the joining member 150 or the flange 16 of the beam 10 by welding or the like.

[0045] Next, reinforcing bars 60, 62 (see FIG. 1) are arranged on the deck plate 120, and concrete is poured to form the concrete portion 130 (see FIGS. 1 to 3).

[0046] [Action and Effects] Next, the operation and effects of this embodiment will be described.

[0047] The deck slab 100 is composed of a wooden board 110, a deck plate 120, and a concrete portion 130. The wooden board 110 is fixed by a screw 90 across the underside of the bottom 123 of two or more valleys 122 of the deck plate 120 composed of folded plates. Therefore, the wooden board 110 exerts a stiffening effect to suppress out-of-plane bending deformation of the deck plate 120, and thus the deflection of the deck slab 100 due to its own weight, etc. is suppressed. From another perspective, by joining and integrating the wooden board 110 with the deck plate 120, a composite effect is exerted, and the strength and rigidity of the deck slab 100 are increased. In addition, the wooden board 110 can transmit in-plane shear force during an earthquake.

[0048] Here, in the case of a deck slab consisting of the deck plate 120 and the concrete portion 130 without the wooden boards 110, in order to increase the rigidity and strength, it is necessary to increase the plate thickness of the steel deck plate 120 and the layer thickness of the concrete portion 130, which will result in a heavy weight. In contrast, by joining the wooden boards 110, which exert a stiffening effect, to two or more valley portions 122 of the deck plate 120 with screws 90, it is possible to increase the rigidity and strength of the deck slab 100 while preventing the weight of the deck slab 100 from increasing.

[0049] In addition, the end 114 of the wooden board 110 is placed on the lower side 154 of the joining member 150 joined to the upper flange 16 of the beam 10 and joined with screws 92. In addition, the end 114 of the wooden board 110 is joined to the deck plate 120 from above with screws 90. Therefore, compared to a configuration in which the wooden board 110 is simply fastened to the deck plate 120 with screws 90, the degree of fixation of the end 114 of the wooden board 110 is increased, further suppressing deflection of the deck slab 100 due to its own weight, etc.

[0050] Here, if an impermeable coating film is formed on the underside 110L of the wooden board 110, moisture dripping from gaps in the deck plate 120 during the concrete curing process may seep into the interior of the wooden board 110 from the upper side 110U of the wooden board 110, and the moisture may be trapped by the impermeable coating film on the underside 110L, which may cause corrosion.

[0051] In contrast, the wooden board 110 of this embodiment does not have an impermeable coating film formed on the entire surface, so even if moisture penetrates into the wooden board 110 from the upper surface 110U of the wooden board 110, the moisture is unlikely to remain on the impermeable coating film on the lower surface 110L, and the penetrated moisture escapes from the lower surface 110L, suppressing corrosion caused by moisture remaining in the wooden board 110. Also, expansion caused by moisture remaining in the wooden board 110 is suppressed.

[0052] Furthermore, in the deck slab 100 of this embodiment, the concrete portion 130 is formed by pouring concrete on the deck plate 120 placed on the wooden board 110 suspended between the beams 10. Therefore, compared to the case where concrete is poured directly onto the upper surface 110U of the wooden board 110, waterproofing treatment of the upper surface 110U of the wooden board 110 is not required, making construction easier.

[0053] <Other> The present invention is not limited to the above embodiment.

[0054] For example, in the above embodiment, the wood board 110 does not have a water-impermeable coating formed on the entire surface, but this is not limited thereto.

[0055] As shown in FIG. 7, an impermeable coating film 112 may be formed on the upper surface 110U and the end surface 110T of the wooden board 110. This makes it difficult for moisture dripping from gaps in the deck plate 120 during the concrete curing process to penetrate into the interior of the wooden board 110 from the upper surface 110U of the wooden board 110. Even if moisture penetrates into the interior of the wooden board 110, it is difficult for it to accumulate, and the moisture escapes from the lower surface 110L, so that corrosion caused by moisture remaining in the wooden board 110 is suppressed. Note that the impermeable coating film 112 does not have to be formed on the end surface 110T. In short, it is sufficient that an impermeable coating film is not formed on the lower surface 110L so that moisture is unlikely to accumulate in the wooden board 110 and can easily escape.

[0056] Also, for example, in the above embodiment, the wooden board 110 is fastened to the deck plate 120 with the screws 90 to join them, but this is not limited to this. Joining may also be done with a means other than the screws 90, for example, nails, rivets such as projecting rivets, plug welding, bolt joining, etc. Alternatively, as shown in Fig. 9(C), the wooden board 110 and the deck plate 120 may be joined with an adhesive 190. The point is that it is sufficient if the wooden board 110 and the deck plate 120 can be joined and integrated.

[0057] Here, an example of a construction method for joining the wooden board 110 and the deck plate 120 with the adhesive 190 will be described.

[0058] As shown in Fig. 9(A) and Fig. 9(B), the wooden board 110 is lifted by a crane or the like, placed on the lower side 154 of the joining member 150, and the wooden board 110 is hung on the beam 10. As shown in Fig. 9(B), an adhesive 190 is applied to the upper surface 110U of the wooden board 110. Alternatively, although not shown, the adhesive 190 is applied to the lower surface of the bottom 123 of the valley portion 122 of the deck plate 120. As the adhesive 190, an adhesive that exhibits adhesive strength to both wood and steel materials, such as an isocyanate adhesive and an epoxy resin adhesive, can be used. Then, as shown in Fig. 9(C), the deck plate 120 is placed on the beam 10 and the wooden board 110 by a crane or the like, and the wooden board 110 and the deck plate 120 are joined with the adhesive 190. At this time, in order to bring the two into close contact, it is desirable to apply a compressive force by, for example, driving screws into the deck plate 120 or placing a weight (concrete, etc.) on the deck plate 120. If the adhesive 190 is applied to the entire surface of the upper surface 110U of the wooden board 110, moisture that drips from gaps in the deck plate 120 during the concrete curing process will be less likely to penetrate into the interior of the wooden board 110 from the upper surface 110U of the wooden board 110.

[0059] Also, for example, in the above embodiment (FIGS. 4 and 5) and modified example (FIG. 9), the wooden board 110 is not supported by shoring or the like during the construction process, but this is not limited to this. The wooden board 110 may be supported by shoring or the like until it is integrated with the deck plate 120, or until the concrete poured on the deck plate 120 hardens and exerts a predetermined strength.

[0060] Also, for example, in the above embodiment, the wooden boards 110 are joined to the deck plate 120, but this is not limited to this. For example, as shown in Fig. 8, a configuration in which rectangular columnar wooden members 300 with their material axis direction in the Y direction are arranged in the X direction may be used. In short, any wooden member may be used as long as it exhibits a stiffening effect against out-of-plane bending deformation of the deck plate 120 made of folded plates.

[0061] Also, for example, in the above embodiment, the wooden boards 110 are arranged at intervals L in the Y direction, which is the beam direction of the beam 10, and the hanging bolts 70 pass through the intervals L, but this is not limited to this. The hanging bolts 70 do not have to be provided. Also, the wooden boards 110 may be arranged without any intervals L. Also, the lower surfaces 110L of the wooden boards 110 may be used as the ceiling surface.

[0062] Also, for example, in the above embodiment, the end 114 of the wooden board 110 is joined to the lower side 154 of the joining member 150 with the screw 92, but this is not limited to this and may be joined with, for example, an adhesive. Also, the end 114 of the wooden board 110 may be a hanging member on which the board is simply placed without being joined with the screw 92 or adhesive. Furthermore, a configuration without such a joining member 150 and hanging member is also possible. In this case, it is desirable to join the wooden board 110 to the deck plate 120 with the screw 90 or adhesive 190, etc., and then place the board on the beam 10.

[0063] Also, for example, in the above embodiment, the beam 10 is a steel beam made of H-shaped steel, but is not limited thereto. The beam 10 may be a steel beam other than H-shaped steel, or a beam other than a steel beam, for example, a beam made of reinforced concrete or steel-reinforced concrete.

[0064] Here, known examples of deck slabs include a composite deck slab and a composite deck slab. The composite deck slab includes a deck plate and concrete poured on the deck plate. The composite deck slab has a structure in which the concrete resists compressive forces generated in the slab, and the deck plate resists tensile forces generated in the slab. The composite deck slab includes a deck plate, concrete poured on the deck plate, and tensile reinforcement. The composite deck slab has a structure in which the concrete resists compressive forces generated in the slab, and the tensile reinforcement resists tensile forces generated in the slab. The present invention can be applied to both the composite deck slab and the composite deck slab.

[0065] Furthermore, the present invention can be embodied in various forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0066] 10 beams 90 bis 100 Deck Slab 110 Wood board (an example of a wood material) 110U top 110L bottom 112 Water impermeable coating 120 Deck plate (an example of a steel folded plate) 122 Valley 124 Yamabe 130 Concrete Section 150 Joint materials 300 Wood materials (examples of wood materials)

Claims

1. A steel folded plate is placed between the beams and has groove-shaped peaks and valleys alternately formed in the width direction; A wooden member that is provided under the folded plate and joined across the lower surfaces of two or more of the valley portions and exerts a stiffening effect against out-of-plane bending deformation of the folded plate; A concrete portion provided on the folding plate; Deck slab with.

2. The wooden member is No impermeable coating is formed on the surface. or The impermeable coating is formed on the upper surface but not on the lower surface. The deck slab of claim 1.

3. The beam is not provided with a rest portion on which the end of the wooden member is rested. The deck slab according to claim 1 or claim 2.

4. The end of the wooden member is placed on and joined to a joining member joined to the beam. The deck slab according to claim 1 or claim 2.

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