JP7605605B2 - Synthetic floor - Google Patents

Description

The present invention relates to a composite floor that includes a concrete section and a wood or synthetic resin section.

The following Patent Document 1 describes a method for constructing a slab that integrates concrete with a casting formwork used when pouring the concrete.

JP 2008-285961 A

To construct a composite floor in which concrete and pouring formwork are integrated, support members (shoring) are erected on the lower floor, and the pouring formwork is supported by the support members while the concrete is poured.
However, this construction method requires time and expense to install and remove the support members, and has the problem that the support members can interfere with work on the floor below.

Taking the above facts into consideration, the present invention aims to provide a composite floor that does not require support members when pouring concrete.

The synthetic floor described in claim 1 comprises bottom reinforcement, top reinforcement arranged above the bottom reinforcement, and lattice reinforcement that connects the bottom reinforcement and the top reinforcement and has a bent portion protruding below the bottom reinforcement, and has truss reinforcement supported by beams, a wood plate or synthetic resin plate arranged below the lattice reinforcement, a fixing member that fixes the bent portion of the lattice reinforcement to the wood plate or synthetic resin plate from above, and a concrete section that is poured on top of the wood plate or synthetic resin plate and is integrated with the wood plate or synthetic resin plate and the truss reinforcement.

In the synthetic floor described in claim 1, when concrete is poured to form the concrete section, the wood or synthetic resin plate fixed to the truss reinforcement functions as a formwork for the concrete, and after the concrete hardens, the wood or synthetic resin plate and the concrete section become integrated.
In addition, because the wood or synthetic resin plate is fixed to the bent parts of the lattice reinforcement of the truss reinforcement that is supported by spanning the beams using fixing members, there is no need for supporting members to support the wood or synthetic resin plate from the lower floor when pouring concrete, which shortens the construction period.

The invention described in claim 2 is the composite floor described in claim 1, in which the fixing member is formed in a half-ring shape so as to cover the bent portion of the lattice reinforcement from above, and is fixed to the wood board or the synthetic resin board with a screw.

In the synthetic floor described in claim 2, the fixing member formed in a semi-ring shape can be fixed to the wood board or synthetic resin board with a screw with the concave portion facing downward so as to cover the bent portion. This fixing member formed in a semi-ring shape can be easily formed, for example, by cutting a ring-shaped member in half, which reduces manufacturing costs.

The invention described in claim 3 is the composite floor described in claim 1, in which the fixing member has a cover portion that covers the bent portion of the lattice reinforcement from above, and a flange portion that protrudes from both ends of the cover portion and is fixed to the wood board or the synthetic resin board with screws.

In the composite floor described in claim 3, the cover portion is arranged to cover the bent portion, and the flange portion can be fixed to the wood or synthetic resin plate with screws. In this way, since the flange portion protrudes from both ends of the cover portion, it is easy to fix the flange portion to the wood or synthetic resin plate.

The invention described in claim 4 is a synthetic floor described in any one of claims 1 to 3, in which the wood slab is waterproofed at the portion that comes into contact with the concrete portion.

The wood slab of the synthetic floor described in claim 4 is waterproofed in the area that comes into contact with the concrete, preventing moisture from the concrete from being absorbed by the wood slab.

The composite floor of the present invention has the above-mentioned structure, so there is no need for a support member that supports from below the wood or synthetic resin plate that constitutes part of the composite floor and functions as a formwork when pouring concrete.

FIG. 1 is a cross-sectional view showing a synthetic floor according to an embodiment of the present invention. This is a cross-sectional view perpendicular to the truss bars, showing the joint between the truss bars and the wooden floor slab. FIG. 2 is a perspective view showing the joint between the truss reinforcement and the wooden floor slab. FIG. 2 is a cross-sectional view corresponding to FIG. 1 and showing a state before concrete is poured. 13 is a cross-sectional view showing a modified example of the fixing member. FIG. FIG. 11 is a cross-sectional view showing another modified example of the fixing member.

The synthetic floor according to the embodiment of the present invention will be described below with reference to the drawings. Components indicated with the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiples. Also, explanations of configurations and reference numerals that are duplicated in each drawing may be omitted. Note that the present invention is not limited to the following embodiment, and may be implemented with appropriate modifications, such as omitting configurations or replacing them with different configurations, within the scope of the purpose of the present invention.

<Synthetic floor>
As shown in Fig. 1, a composite floor 20 according to an embodiment of the present invention is a slab in which a concrete slab 30 as a concrete portion is integrally formed with a wooden floor slab 40. Inside a building, the composite floor 20 is spanned across beams (e.g., beams 12 and 14) supported by columns (not shown).

The beams across which the composite floor 20 is spanned can be H-shaped steel beams 12 shown on the left side of FIG. 1, wooden beams 14 shown on the right side of FIG. 1, or reinforced concrete beams (not shown), and the type of structure is not particularly limited. In this embodiment, a case where the composite floor 20 is spanned across beams 12 and 14 will be described.

In this embodiment, the outer surface of the beam 12 made of H-shaped steel is covered with a fire-resistant coating 44 such as rock wool except for the upper surface. The wooden beam 14 can be made of fire-resistant laminated lumber, for example.

In this specification, the left-right direction on the paper surface of FIG. 1 is referred to as the X direction, and the front-back direction on the paper surface is referred to as the Y direction. The X direction and the Y direction are directions that are approximately perpendicular to each other. In FIG. 2 described later, the left-right direction on the paper surface is the same as the Y direction, and the front-back direction on the paper surface is the same as the X direction.

(Concrete slab)
The concrete slab 30 forming the composite floor 20 is formed by embedding truss bars 32 and connecting bars 32D perpendicular to the truss bars 32 in concrete 34.
2 and 3, the truss reinforcement 32 used in this embodiment is formed with one top reinforcement 32A, two bottom reinforcements 32B, and lattice reinforcement 32C. The lattice reinforcement 32C has a wave-like shape with amplitude in the vertical direction, and connects the top reinforcement 32A and the bottom reinforcement 32B.
In the present embodiment, the truss reinforcement 32 has a lower bent portion 32Cb of the lattice reinforcement 32C protruding downward from the bottom reinforcement 32B, and the protruding dimension of the bent portion 32Cb from the lower end of the bottom reinforcement 32B is h. The truss reinforcement 32 is manufactured, for example, in a factory or the like by welding the lattice reinforcement 32C to the sides of the top reinforcement 32A and the bottom reinforcement 32B.

The truss bars 32 are arranged at intervals along the longitudinal direction (Y direction) of the beams 12 and 14, and connecting bars 32D perpendicular to the longitudinal direction (X direction) of the truss bars 32 are hung on the top of the truss bars 32. The connecting bars 32D are fastened to the top bars 32A of the truss bars 32 with wire or the like.

The concrete 34 is poured using the wooden floor slab 40 (described later) as a form (a throwaway form).

As shown in FIG. 1, one side of the truss bar 32 is supported on the H-shaped steel beam 12, and the other side is supported by a lug screw bolt 48 attached to the wooden beam 14.

The truss bar 32 mounted on the H-shaped steel beam 12 has the lower end of the bent portion 32Cb joined to the beam 12 by welding.

The protruding dimension h of the bent portion 32Cb is the same as the cover thickness of the reinforcing bar (truss bar 32), and the bent portion 32Cb is also used as a spacer for the reinforcing bar. This eliminates the need to prepare a spacer as a separate part to ensure the cover thickness.

In this embodiment, two lug screw bolts 48 are fixed to the wooden beam 14. The bottom bar 32B of the truss bar 32 is clamped between a pair of flat washers 50 attached to the lug screw bolts 48 and a pair of nuts 52, so that the other side of the truss bar 32 is supported by the wooden beam 14 via the lug screw bolts 48.

(Wood flooring)
As shown in Fig. 2, the wooden floor slab 40 of this embodiment is formed using CLT (Cross Laminated Timber). In addition to CLT, the wooden floor slab 40 may be made of LVL (Laminated Veneer Lumber), laminated timber, plywood, solid wood boards, etc. A plurality of wooden floor slabs 40 are arranged in the Y direction.

It is preferable that at least the portion of the wooden floor 40 that comes into contact with the concrete 34 be waterproofed.
2 and 3, a waterproofing treatment is applied to the entire upper surface of the wooden floor 40 by attaching a waterproof sheet 54 as a waterproof layer to prevent the wooden floor 40 from absorbing moisture from the concrete 34. Note that instead of the waterproof sheet 54, a waterproofing treatment such as applying a waterproof paint to the portion of the wooden floor 40 that contacts the concrete 34 (for example, the entire upper surface) may be applied. In this way, by waterproofing the wooden floor 40 to prevent the wooden floor 40 from absorbing moisture from the concrete 34, the aesthetic appearance and structural performance of the wooden floor 40 can be maintained.
As another method, the wooden floor 40 may be impregnated with resin so that the wooden floor 40 itself does not absorb moisture from the concrete 34.

The wooden floor slab 40 is fixed to the bent portion 32Cb of the truss bar 32 by using a fixing member 46. The fixing member 46 in this embodiment includes a metal curved portion 46A that is bent into a substantially semicircular arc or a substantially U-shape, and flanges 46B provided on both ends of the curved portion 46A. The flanges 46B are formed in a flat plate shape and have holes for inserting wood screws 56 therethrough.
The curved portion 46A is positioned so as to straddle the upper side of the bent portion 32Cb, and the wood screw 56 inserted into the hole in the flange portion 46B is screwed into the wood flooring 40, thereby attaching the wood flooring 40 to the truss reinforcement 32.

As shown in FIG. 1, the top surface of the H-shaped steel beam 12 and the top surface of the wooden floor slab 40 are at the same height (so-called flush relationship), and the gap S1 between the upper flange 12A of the H-shaped steel and the wooden floor slab 40 is filled with a steel plate 58 placed on the flange 12A and the wooden floor slab 40. In this embodiment, the steel plate 58 is fixed to the flange 12A of the H-shaped steel by welding, and can hold down the end of the wooden floor slab 40 from above. Therefore, for example, before the truss reinforcement 32 is joined to the flange 12A of the H-shaped steel and before concrete is poured, when the wind blows up and hits the wooden floor slab 40, the wooden floor slab 40 can be prevented from moving.

The steel plate 58 may be welded to the flange 12A of the H-shaped steel before the truss bars 32 with the wooden flooring 40 attached are stretched across the beams 12 and 14, or it may be fixed to the wooden flooring 40 with wood screws (not shown) or the like, and then welded to the flange 12A of the H-shaped steel after the truss bars 32 with the wooden flooring 40 attached are stretched across the beams 12 and 14.

The gap S2 between the wooden beam 14 and the wooden floor slab 40 is filled with angle irons 60 or the like. The angle irons 60 are fixed to the beam 14 with wood screws (not shown) or the like.

<Action and Effects>
First, an example of a construction process for the synthetic floor 20 will be briefly described.
(1) The wooden floor slab 40 is assembled to the truss reinforcement 32 (the wooden floor slab 40 is fixed to the truss reinforcement 32 using the fixing members 46 and wood screws 56). Note that the work of assembling the wooden floor slab 40 to the truss reinforcement 32 can also be performed outside the construction site, such as in a factory.
(2) The truss reinforcement 32 to which the wooden floor slab 40 is fixed is lifted by a crane and placed across the beams 12 and 14, and the truss reinforcement 32 is fixed to the beams 12 and 14.
(3) The gap S1 between the upper flange 12A of the H-shaped steel and the wooden floor slab 40 is filled with a steel plate 58, and the gap S2 between the wooden beam 14 and the wooden floor slab 40 is filled with an angle iron 60 (see Figure 6).
(4) Then, as shown in FIG. 1, concrete 34 is poured onto the wooden floor slab 40, and the concrete 34 is allowed to harden so that the concrete 34 and the wooden floor slab 40 are integrated together.
In addition, the gap S1 between the H-shaped steel beam 12 and the wooden floor slab 40, and the gap S2 between the wooden beam 14 and the wooden floor slab 40 are sealed with steel plates 58 and angle irons 60 before pouring the concrete 34, thereby preventing the concrete 34 from leaking out through the gaps S1 and S2 when the concrete 34 is poured.

Because the wooden floor slab 40 is fixed to the truss bars 32, there is no need for temporary reinforcement (also called support members) such as shoring to support the wooden floor slab 40 from below when pouring concrete in the lower layer below the wooden floor slab 40. This eliminates the need to install and remove temporary reinforcement, and prevents the temporary reinforcement from interfering with work on the lower layer.

<Other embodiments>
The above describes one embodiment of the synthetic floor of the present invention, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms within the scope of the gist of the present invention.

In the above embodiment, the truss reinforcement 32 to which the wooden floor slab 40 is attached is fixed across the H-shaped steel beam 12 and the wooden beam 14, but the truss reinforcement 32 to which the wooden floor slab 40 is attached may be spanned across a pair of H-shaped steel beams 12 or across a pair of wooden beams 14, and the material and type of the beams across which the truss reinforcement 32 is spanned are not important.

The truss reinforcement 32 used in the above embodiment has a structure in which one top reinforcement 32A and two bottom reinforcement 32B are connected by lattice reinforcement 32C, but the present invention is not limited to this, and if necessary, the truss reinforcement 32 may be replaced with a truss reinforcement having one top reinforcement and one bottom reinforcement connected by lattice reinforcement.

The fixing members 46 used in the above embodiment are merely an example, and the shape of the fixing members 46 is not important as long as they can connect the bent portions 32Cb of the lattice reinforcement bars 32C to the wooden floor slab 40. The material of the fixing members 46 is not limited to metal, but may be wood, synthetic resin, or the like.
5 and 6 show modified examples of the fixing member 46. FIG.
The fixing member 46 shown in FIG. 5 is in the shape of a half ring, made by cutting a round wooden bar in half with a round hole formed therein, and is fixed to the wooden floor slab 40 by wood screws 56 .
The fixing member 46 shown in FIG. 6 is a rectangular wooden board cut in half with a round hole 64 formed in the center, and is fixed to the wooden floor slab 40 by wood screws 56 .

In the above embodiment, a wooden floor slab 40 is used for the synthetic floor 20, but the present invention is not limited to this, and a synthetic resin floor plate may be used instead of the wooden floor slab 40. The synthetic resin floor plate may be a synthetic resin plate reinforced with a reinforcing material such as FRP (fiberglass reinforced plastic).

12 Beam 14 Beam 20 Composite floor 30 Concrete slab 32 Truss bar 32A Top bar 32B Bottom bar 32C Lattice bar 32Cb Bend
40 Wood floor slab 46 Fixing member 46A Curved portion (covering portion)
46B flange 54 waterproof sheet (waterproof layer)
56 Wood screws

Claims (7)

A truss reinforcement includes a bottom reinforcement, a top reinforcement arranged above the bottom reinforcement, and a lattice reinforcement that connects the bottom reinforcement and the top reinforcement and has a convex bent portion protruding below the bottom reinforcement, and is supported by being spanned across a beam;
A wood plate or a synthetic resin plate arranged below the lattice reinforcement;
A fixing member that fixes the top of the bent portion of the lattice reinforcement from above to the wood board or the synthetic resin board;
A concrete section that is poured on top of the wood board or the synthetic resin board and is integrated with the wood board or the synthetic resin board and the truss reinforcement;
A synthetic floor having The fixing member is formed in a half-ring shape so as to cover the bent portion of the lattice reinforcement from above and is fixed to the wood plate or the synthetic resin plate with a screw.
The synthetic floor of claim 1. The fixing member has a cover portion that covers the bent portion of the lattice reinforcement from above, and a flange portion that protrudes from both ends of the cover portion and is fixed to the wood plate or the synthetic resin plate with a screw.
The synthetic floor of claim 1. The wood slab is waterproofed at the portion in contact with the concrete portion.
The synthetic floor according to any one of claims 1 to 3. The bent portion of the lattice muscle is in contact with the wood board or the synthetic resin board.
The synthetic floor according to any one of claims 1 to 4. The fixing member is fixed to the wood board or the synthetic resin board without penetrating the wood board or the synthetic resin board.
The synthetic floor according to any one of claims 1 to 5. A truss reinforcement includes a bottom reinforcement, a top reinforcement arranged above the bottom reinforcement, and a lattice reinforcement that connects the bottom reinforcement and the top reinforcement and has a bent portion protruding below the bottom reinforcement, and is supported by being spanned across a beam;
A wood plate or a synthetic resin plate arranged below the lattice reinforcement;
A fixing member that fixes the bent portion of the lattice reinforcement from above to the wood board or the synthetic resin board;
A concrete section that is poured on top of the wood board or the synthetic resin board and is integrated with the wood board or the synthetic resin board and the truss reinforcement;
having
The fixing member is formed in a half-ring shape so as to cover the bent portion of the lattice reinforcement from above and is fixed to the wood plate or the synthetic resin plate with a screw.
Synthetic floor.