JP2019039171A - Composite slab - Google Patents

Abstract

To improve durability of a composite slab constituted by a ligneous slab and a reinforced-concrete slab.SOLUTION: A composite slab 10 is constituted by including a ligneous slab 50 and a reinforced-concrete slab 20 joined on an upper surface 50A of the ligneous slab 50. At a main reinforcement 28 on the lower side, a recess reinforcement 32 is formed arranged at a groove part 60 (protrusion 30) by being curved.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a synthetic slab.

  Patent Document 1 discloses a building member (ceiling member, floor member, wall member) configured by bonding a concrete layer or a mortar layer and a wood layer with an adhesive.

  Patent Document 2 discloses a composite floor structure formed by placing concrete on a decorative plate in a state where a wooden decorative plate is disposed as a bottom plate of a floor concrete slab placing area.

JP-T-2002-511910 JP2013-083104A

  In the case of a composite slab composed of a wooden plate and a reinforced concrete plate, shear force acts between the wooden plate and the reinforced concrete plate due to out-of-plane bending deformation, etc., causing the wooden plate and the reinforced concrete plate to shift, resulting in the composite slab. There is a risk that the yield strength of the steel will be reduced.

  In view of the above facts, the present invention has an object to improve the proof stress of a synthetic slab composed of a wood plate and a reinforced concrete plate.

  The invention of claim 1 includes a wood plate having a recess formed on the top surface, a reinforced concrete plate provided on the top surface of the wood plate, and a recess bar fixed to the reinforced concrete plate and arranged in the recess. It is a synthetic slab equipped.

  In invention of Claim 1, it is weight-reduced rather than the slab made from a reinforced concrete by setting it as the synthetic | combination slab by which the reinforced concrete plate was provided in the upper surface of the wooden board. Moreover, the recessed part fixed to a reinforced concrete plate is arranged in the recessed part formed in the upper surface of a wooden board. Therefore, the shearing force acting between the wooden plate and the reinforced concrete plate due to out-of-plane bending deformation or the like is effectively transmitted. Therefore, the yield strength of the synthetic slab is effectively improved.

  The invention according to claim 2 is the wood plate according to claim 1, wherein the wood plate is configured by abutting end surfaces of a plurality of plate members, and the recess is formed so as to straddle a portion where the end surfaces are abutted. It is a synthetic slab as described.

  In the second aspect of the present invention, since the concave portion is formed so as to straddle the portion where the end faces of the plate materials are abutted with each other, each of the plate materials effectively transmits the shearing force with the reinforced concrete plate.

  Invention of Claim 3 is a synthetic | combination slab of Claim 1 or Claim 2 with which the said wooden board is comprised by the orthogonal laminated material which laminated | stacked and bonded the board so that the fiber direction might be orthogonal.

  In the invention according to claim 3, since the cross-glued material obtained by laminating and bonding the saw plates so that the fiber directions are orthogonal to each other is used for the wood plate, the strength of the wood plate is improved. As a result, the strength of the synthetic slab is reduced. Further improvement.

  ADVANTAGE OF THE INVENTION According to this invention, the yield strength of the synthetic | combination slab comprised with the wooden board and the reinforced concrete board can be improved.

It is a longitudinal cross-sectional view along the X direction of the synthetic | combination slab which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view along the X direction of the wood board before joining the reinforced concrete board of the synthetic slab of FIG. It is a top view of the wooden board before joining the reinforced concrete board of the synthetic slab of FIG. It is a longitudinal cross-sectional view along the X direction of the precast concrete reinforced concrete plate which comprises the synthetic | combination slab of a 1st modification. It is a longitudinal cross-sectional view along the X direction of the reinforced concrete plate of the precast concrete structure which comprises the synthetic | combination slab of a 2nd modification. It is a longitudinal cross-sectional view corresponding to FIG. 1 along the X direction of the synthetic | combination slab of a 2nd modification. It is a longitudinal cross-sectional view corresponding to FIG. 1 along the X direction of the synthetic | combination slab of a 3rd modification. It is a top view corresponding to Drawing 3 of a wooden board before joining a reinforced concrete board of a synthetic slab of the 4th modification.

  A synthetic slab according to an embodiment of the present invention will be described. Note that two orthogonal directions in the horizontal direction are indicated by arrows X and Y, and the vertical direction is indicated by arrows Z. 2 is a cross-sectional view taken along line 2-2 of FIG.

<Structure>
First, the structure of the synthetic slab according to one embodiment of the present invention will be described.

  As shown in FIG. 1, the synthetic slab 10 includes a wood plate 50 and a reinforced concrete plate 20 joined to an upper surface 50 </ b> A of the wood plate 50. The composite slab 10 is supported by beams arranged in a lattice shape along the X and Y directions (not shown).

  As shown in FIGS. 1, 2, and 3, the wood plate 50 is composed of a plurality of plate members 52 made of cross-laminated timber (CLT).

  As shown in FIG. 1 and FIG. 2, each plate member 52 made of orthogonally laminated material is formed by stacking layers in which a plurality of saw plates 54 are arranged so that the fiber directions of the wooden fibers 56 of the saw plates are orthogonal to each layer. Bonded panel material.

  The board member 52 of the orthogonal laminated material of the present embodiment has a three-layer structure, and the fiber directions of the wood fibers 56 on both outer layers in the thickness direction are along the Y direction, and the fiber directions of the wood fibers 56 in the middle layer Is along the X direction. In addition, the board | plate material 52 of an orthogonal laminated material may be two layers other than three layers, and may be four layers or more.

  As shown in FIGS. 1, 2, and 3, on the upper surface 52 </ b> A of the plate member 52, a stepped portion 62 having a rectangular shape in plan view with the X direction connected to the end surface 52 </ b> B as a longitudinal direction is formed. The plate member 52 has the end faces 52B attached to each other and bonded together, and the end faces 52B are attached to each other and bonded to each other, whereby the stepped portion 62 is connected and the groove portion 60 having the X direction as the longitudinal direction is formed. That is, the groove 60 is formed on the upper surface 50 </ b> A of the wooden plate 50. Moreover, the groove part 60 is formed so that the site | part where end surface 52B of the board | plate material 52 was faced | matched may be straddled. The plate members 52 may be joined by a method other than bonding, or may not be joined.

  In this embodiment, the stepped portion 62 of the plate material 52 is formed by shaving after the plate material (orthogonal laminated material) 52 is manufactured, but may be formed by other methods.

  As shown in FIG. 1, on the upper surface 50A of a wood plate 50 composed of a plurality of plate members 52, the main bars 22, 28 and the laying bars 24, 26 are laid and concrete is placed, and the reinforced concrete plate 20 is formed. Is formed. When placing concrete, the wood plate 50 functions as a part of the mold.

  Concrete flows into each groove portion 60 on the upper surface 50A of the wood plate 50, and protrudes downward on the lower surface 20A of the reinforced concrete plate 20 to form a convex portion 30 that engages with the groove portion 60.

  In the upper part of the reinforced concrete plate 20, the main reinforcing bars 22 along the X direction and the distributing bars 24 along the Y direction are arranged and fixed in a lattice pattern, and at the lower part, the main reinforcing bars 28 along the X direction and the Y direction. Are arranged and fixed in a lattice pattern.

  The lower main reinforcing bars 28 are formed with concave reinforcing bars 32 that are curved and arranged in the groove 60 (the convex part 30). As shown in FIG. 3, in the present embodiment, the concave stripe 32 is formed only on the main stripe 28 corresponding to the groove 60. However, the structure may be such that all the main bars 28 are formed with the recessed bars 32 arranged in the groove part 60 (convex part 30).

(Function and effect)
Next, the operation and effect of this embodiment will be described.

  In the synthetic slab 10 of the present embodiment, since the reinforced concrete plate 20 is provided on the upper surface 50A of the wooden plate 50, the weight is reduced compared to the slab made of only reinforced concrete, and the slab made of only the wooden plate. In addition, fireproof performance and soundproof performance are improved.

  Further, a groove portion 60 is formed on the upper surface 50 </ b> A of the wooden plate 50, and a convex portion 30 that engages with the groove portion 60 is formed on the lower surface 20 </ b> A of the reinforced concrete plate 20. And the main reinforcement 28 fixed to the reinforced concrete plate 20 is curved, and the recessed reinforcement 32 arranged by the groove part 60 (convex part 30) is formed.

  Therefore, the shearing force acting between the wood plate 50 and the reinforced concrete plate 20 due to out-of-plane bending deformation or the like is effectively transmitted by the groove portion 60 and the convex portion 30. Therefore, the yield strength of the synthetic slab 10 is effectively improved.

  Moreover, in this embodiment, since the orthogonal laminated material which laminated | stacked and bonded the board so that the fiber direction was orthogonally crossed is used for the board | plate material 52 which comprises the wooden board 50, the yield strength of the wooden board 50 improves, As a result, Further, the yield strength of the synthetic slab 10 is further improved.

  Moreover, in this embodiment, since the groove part 60 is formed so that the site | part where the end surfaces 52B of the board | plate material 52 face | matched each other may be formed, each board | plate material 52 transmits a shearing force between the reinforced concrete plates 20 effectively. To do.

<Modification>
Next, a modification of this embodiment will be described.

[First modification]
A first modification will be described.

  As shown in FIG. 4, in the first modification, the reinforced concrete plate 120 to be joined to the upper surface 50A (see FIG. 2) of the wood plate 50 is precast concrete manufactured in advance in a factory or the like. Then, the reinforced concrete plate 120 is engaged with the upper surface 50A (see FIG. 2) of the wood plate 50, the convex portion 30 is engaged with the groove portion 60 (see FIG. 2), and is joined with an adhesive or the like.

[Second modification]
A second modification will be described.

  As shown in FIG. 5, in the second modification, the reinforced concrete plate 220 to be joined to the upper surface 50A (see FIGS. 2 and 6) of the wood plate 50 is precast concrete manufactured in advance in a factory or the like.

  Convex portions 230 (see FIG. 6) are not formed on the lower surface 220A of the reinforced concrete plate 220, and the concave portions 32 are exposed.

  As shown in FIG. 6, the groove portion 60 of the upper surface 50 </ b> A of the wood plate 50 is filled with a filler J such as adhesive, concrete, mortar, and grout, and the recessed portion 32 of the reinforced concrete plate 220 is inserted into the groove portion 60 and joined.

[Third modification]
A third modification will be described.

  As shown in FIG. 7, in the third modified example, the reinforced concrete plate 320 joined to the upper surface 50A (see also FIG. 2) of the wood plate 50 has the main bar 28 not curved and the convex portion 30 protruding from the lower surface 320A. The reinforced concrete plate 320 has a recessed reinforcing bar 322 that is fixed separately.

  The reinforced concrete plate 320 may be cast on site or precast concrete manufactured in advance in a factory or the like. Moreover, in the case of precast concrete, the convex part 30 may not be formed and the recessed part 232 may be exposed like the 2nd modification of FIG.

[Fourth modification]
A fourth modification will be described.

  As shown in FIG. 8, a stepped portion 462 having a rectangular shape in plan view connected to the end surface 52 </ b> B is formed on the upper surface 52 </ b> A of the plate member 52. The plate member 52 is arranged with the end surfaces 52B attached to each other, and the end surfaces 52B are attached to each other, whereby the stepped portion 462 is connected to form a substantially square concave portion 460. That is, the concave portion 460 is formed on the upper surface 50 </ b> A of the wooden plate 50. And the recessed part 32 of the some main reinforcement 28 is arranged in this recessed part 460.

<Others>
In addition, this invention is not limited to the said embodiment and modification.

  For example, in the above embodiment and the modified example, the wood plate 50 of the synthetic slab 10 has the groove portion 60 or the recess portion 460 formed so as to straddle the portion where the end faces 52B of the plate material 52 are abutted with each other, but is not limited thereto. . The groove part 60 or the recessed part 460 may be formed in the place away from the site | part where the end surfaces 52B of the board | plate material 52 faced | matched.

  Further, for example, in the above-described embodiment and modification, the wood plate 50 of the synthetic slab 10 is configured by arranging a plurality of orthogonally laminated plate materials 52, but is not limited thereto. For example, it may be a single plate laminated material (LVL (Laminated Veneer Number)) in which the fiber directions of the single plate are aligned and bonded, or a solid material.

  Further, for example, in the above-described embodiment and modification, the main muscle 28 is curved to form the concave muscle 32, but the present invention is not limited to this. The distribution muscles 26 may be curved to form the concave muscles 32.

  Moreover, the above-mentioned embodiment, a modification, and other description can be implemented in combination as appropriate.

  Furthermore, the present invention can be implemented in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Synthetic slab 20 Reinforced concrete board 50 Wood board 50A Upper surface 52 Board material 52B End face 54 Ground board 60 Groove part (an example of recessed part)
120 Reinforced concrete plate 220 Reinforced concrete plate 320 Reinforced concrete plate 460 Concave portion

Claims (3)

A wooden plate with a recess formed on the upper surface;
A reinforced concrete plate provided on the upper surface of the wooden plate;
A concave line which is fixed to the reinforced concrete plate and is arranged in the concave part;
Synthetic slab with The wood plate is configured by abutting end faces of a plurality of plate members,
The recess is formed so as to straddle the part where the end faces are abutted.
The synthetic slab of claim 1. The wood plate is composed of orthogonal laminated material obtained by laminating and laminating a ground plate so that the fiber directions are orthogonal.
The synthetic slab according to claim 1 or claim 2.