Composite floor
A composite floor design with grooves aligned to the longitudinal direction of reinforcement in the wooden surface material and cotters in the concrete slab addresses manufacturing challenges, achieving high shear transfer performance and reduced costs.
Patent Information
- Application Number
- JP2024083413
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-12-05
AI Technical Summary
Existing composite floor structures, such as those described in Patent Document 1, require significant manufacturing effort and cost due to the need for numerous recesses and lag screws to achieve high shear transfer performance between wood and concrete layers.
A composite floor design featuring a wooden surface material with grooves on its upper surface, aligned with the longitudinal direction of main reinforcement, and a concrete slab with strip-shaped cotters inserted into these grooves, eliminating the need for lag screws and enhancing shear transfer performance.
The design reduces manufacturing effort and cost while achieving high shear transfer performance between the concrete and wooden layers, with improved rigidity and strength, allowing for efficient construction and reduced environmental impact.
Smart Images
Figure 2025176974000001_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to synthetic flooring. [Background technology]
[0002] Amid the recent growing demand for reducing environmental impact and active efforts to be environmentally conscious, the construction industry has been actively developing technologies that make effective use of wood, and in wooden buildings and hybrid buildings made of wood, steel, or concrete, various structural components such as beams, columns, walls, and floors are made of wood. Wood is lighter than steel frames or concrete, has a high specific strength, is easy to process, has high thermal insulation properties, has moisture-regulating properties, and has the appearance design that comes from natural materials. As a natural material, it produces less carbon dioxide emissions and is highly effective in reducing environmental impact. It is a material that offers a variety of benefits.
[0003] When we look at the floors of buildings such as apartment buildings, when floors are constructed using only wood such as wood surface materials, composite floors made by laminating wood surface materials and concrete floor slabs may be installed in order to improve or enhance performance that is an issue with wood, such as sound insulation and fire resistance.
[0004] Patent Document 1 proposes a load-bearing board member. This load-bearing board member includes wood layers laminated so that the fiber direction of the wood fibers crosses each other, and a concrete or mortar layer bonded to one surface of the wood layer. The stress transmission means transmits stress between the wood layer and the concrete or mortar layer. Examples of the stress transmission means include cotters that protrude downward from the underside of the concrete or mortar layer and engage with recesses in the wood layer, or lag screws that are fixed to the wood layer and embedded in the concrete layer. The recesses in the wood layer are circular in plan view, with many recesses distributed across the wide surface of the wood layer. [Prior art documents] [Patent documents]
[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-78307 Summary of the Invention [Problem to be solved by the invention]
[0006] In the load-bearing board member described in Patent Document 1, cotters on the underside of the concrete or mortar layer engage with recesses in the wood layer, and vertically extending lag screws fixed to the wood layer are embedded in the concrete or mortar layer. Therefore, the shear transfer performance (composite effect) between the concrete and wood layers is determined by the shear strength of the recess-cotter engagement and the shear strength of the lag screws. However, such a structure, which includes not only the recess-cotter engagement but also the driving of lag screws as components, inevitably requires a lot of manufacturing effort and high manufacturing costs. In particular, in the load-bearing board member described in Patent Document 1, numerous circular recesses in plan view are formed on the wide surface of the wood layer, which increases the amount of work required to machine the recesses and drive the lag screws into each recess. This clearly results in a significant amount of work required to manufacture the load-bearing board member.
[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a composite floor that has high shear transfer performance between the concrete floor slab and the wooden surface material while reducing both the manufacturing effort and manufacturing costs. [Means for solving the problem]
[0008] In order to achieve the above object, one aspect of the synthetic bed according to the present invention is: A composite floor having a wooden surface material and a concrete floor slab provided with main reinforcement and distribution reinforcement, the concrete slab being disposed on the upper wide surface of a pair of wide surfaces of the wooden surface material, A groove is provided on the upper wide surface of the wooden surface material, and a strip-shaped cotter that is part of the concrete floor slab is inserted into the groove, The fiber direction in the area of the wood surface material on the concrete floor slab side where the groove is provided is set to the longitudinal direction or approximately the longitudinal direction of the main reinforcement, The longitudinal direction of the grooves is set in a direction intersecting the fiber direction.
[0009] According to this aspect, the composite floor has a wooden surface material and a concrete slab arranged on the wide surface above it, and a strip-shaped cotter that is part of the concrete slab is inserted into the groove on the wide surface above the wooden surface material.The fiber direction in the area of the wooden surface material on the concrete slab side where the groove is arranged is set to the longitudinal direction or approximately the longitudinal direction of the main reinforcement in the concrete slab, and the longitudinal direction of the groove is set to a direction intersecting the fiber direction.As a result, the rigidity or strength in the fiber direction of the wooden surface material, which has relatively higher strength and rigidity than in the direction intersecting the fiber direction of the wooden surface material (for example, a direction perpendicular to it), can resist the shear force acting from the cotter, and a composite floor with high shear transmission performance between the concrete slab and the wooden surface material (exhibiting a high composite effect) can be formed without using lag screws, stud dowels, etc. described in Patent Document 1.
[0010] In Patent Document 1, cross-laminated timber is used as the wood layer, but the top layer of lamina has many recesses that are circular in plan view, which makes the manufacturing process significantly more labor-intensive than the present embodiment, in which a continuous groove (one or more) is provided on the upper wide surface of the wood panel. Furthermore, because circular recesses in plan view are a structural requirement, there is naturally no description of the relationship between the longitudinal direction of the grooves on the upper wide surface of the wood panel and the fiber direction in the area of the wood panel facing the concrete slab, and we would like to add that this does not disclose the technical idea of the present invention.
[0011] Here, "the fiber direction of the area of the wood panel on the concrete slab side where the grooves are provided" refers to the fiber direction of the entire wood panel if the entire wood panel is formed, for example, from a single piece of solid wood, and if the wood panel is a laminate of multiple laminas, it refers to the fiber direction of the topmost lamina in which the recesses are formed.
[0012] Furthermore, "in the area of the wood surface material on the concrete slab side where the grooves are provided, the fiber direction is set to the longitudinal direction of the main reinforcement or approximately the longitudinal direction" means that the fiber direction and the longitudinal direction of the main reinforcement are completely parallel, and since the fiber direction of the wood surface material is not uniformly oriented in the same direction, "approximately the longitudinal direction" includes the overall fiber direction being approximately parallel to the longitudinal direction of the main reinforcement.
[0013] Furthermore, "the longitudinal direction of the groove is set in a direction that intersects with the fiber direction" means, for example, that the longitudinal direction of the groove and the fiber direction in the area of the wood surface material on the concrete slab side are perpendicular to each other, and that they intersect at an angle other than perpendicular (such as 80 degrees or 70 degrees).
[0014] Another aspect of the synthetic floor according to the present invention is The longitudinal direction of the grooves and the fiber direction in the area on the concrete slab side are perpendicular to each other.
[0015] According to this aspect, the longitudinal direction of the grooves and the fiber direction in the area of the wood surface material on the concrete slab side where the grooves are provided are perpendicular to each other, which makes it possible to form a composite floor with even better shear transmission performance. Here, since the fiber direction of the wood surface material is not uniformly oriented in the same direction, if the fiber direction is approximately perpendicular as a whole, it can be included in the perpendicular direction.
[0016] In another embodiment of the synthetic floor according to the present invention, The wood surface material is a cross-laminated lumber in which a plurality of laminas are laminated so that their fiber directions alternately cross each other, The grooves are provided in the lamina of the top layer of the cross-laminated timber, and the fiber direction of the lamina of the top layer is set to the longitudinal direction or approximately the longitudinal direction of the main reinforcement.
[0017] According to this aspect, the wooden surface material is cross-laminated timber (CLT), grooves are provided in the lamina of the top layer of the cross-laminated timber, and the fiber direction of the lamina of the top layer is set to the longitudinal direction or approximately the longitudinal direction of the main reinforcement.As a result, for a composite floor in which cross-laminated timber is applied to the wooden surface material, a composite floor can be formed that has high shear transmission performance between the concrete floor slab and the wooden surface material.
[0018] In another embodiment of the synthetic floor according to the present invention, The wood surface material is one of width-jointed lumber, nail-jointed laminated lumber, and wood dowel-jointed laminated lumber, which are formed by arranging a plurality of laminas in the width direction with their respective fiber directions aligned, The grooves are provided above either the width-jointed timber, nail-jointed laminated timber, or wood dowel-jointed laminated timber, and the fiber direction of the lamina is set in the longitudinal direction or approximately the longitudinal direction of the main reinforcement.
[0019] According to this aspect, the wooden surface material is one of width patch timber, nail-laminated timber (NLT), and dowel-laminated timber (DLT), and grooves are provided above the width patch timber, etc., and the fiber direction of each of the multiple laminas is set to the longitudinal direction or approximately the longitudinal direction of the main reinforcement, thereby forming a composite floor with high shear transfer performance between the concrete floor slab and the wooden surface material for a composite floor in which width patch timber, etc. is applied to the wooden surface material. Here, "formed with multiple laminas aligned in the width direction" means, for example, that multiple laminas are aligned in the short direction or long direction of a wooden surface material that is rectangular in plan view.
[0020] Another aspect of the synthetic floor according to the present invention is The concrete slab is characterized in that it is a precast concrete slab.
[0021] According to this aspect, since the concrete floor slab is a precast concrete slab, the entire concrete floor slab is as homogeneous as possible, has excellent quality, and can form a composite floor that is easy to install on site.
[0022] Another aspect of the synthetic floor according to the present invention is The short-term and long-term strength and deflection of the composite floor are determined solely by the concrete slab; or The short-term and long-term strength of the composite floor is determined solely by the concrete slab, or The short-term bearing capacity of the composite floor is determined solely by the concrete floor slab.
[0023] According to this embodiment, the short-term strength, long-term strength, and overall deflection of the composite floor, or the short-term strength and long-term strength, or the short-term strength is set only by the concrete floor slab, so that composite floors can be designed under a variety of design concepts (design methods), from safe designs (design methods in which the short-term strength, long-term strength, and overall deflection are set only by the concrete floor slab) to rational designs (design methods in which the short-term strength is set only by the concrete floor slab).
[0024] Here, under a design concept in which the short-term strength, long-term strength, and deflection of a composite floor are all determined by the concrete slab alone, the performance of wood surface materials is expected to be an additional performance to all of these performances. Also, under a design concept in which the short-term strength and long-term strength of a composite floor are determined by the concrete slab alone, the performance of wood surface materials is taken into consideration when reducing deflection, and under a design concept in which the short-term strength of a composite floor is determined by the concrete slab alone, the performance of wood surface materials is taken into consideration when reducing the long-term strength and deflection of a composite floor.
[0025] Another aspect of the synthetic floor according to the present invention is The concrete slab is characterized in that the main reinforcement includes upper end main reinforcement and lower end main reinforcement, and upper and lower distribution reinforcement cross the upper end main reinforcement and the lower end main reinforcement, respectively, to form two-stage reinforcement.
[0026] According to this aspect, by having a concrete floor slab with two-stage reinforcement, it is possible to form a composite floor that is relatively thick and has excellent sound insulation and fire resistance.
[0027] Another aspect of the synthetic floor according to the present invention is The concrete slab is characterized in that it has a single-stage reinforcement, in which the main reinforcement is arranged at the center or approximately the center in the thickness direction of the concrete slab, and the main reinforcement is located below the distribution reinforcement.
[0028] According to this aspect, by having a concrete floor slab with single-stage reinforcement, it is possible to form a composite floor that is relatively thin and has an overall weight that is as low as possible.
[0029] Another aspect of the synthetic floor according to the present invention is The concrete floor slab has a first-stage reinforcement in which the main reinforcement is arranged at the center or approximately the center in the thickness direction of the concrete floor slab and the main reinforcement is located below the distribution reinforcement, The cross-laminated timber is characterized by being three layers and three plies.
[0030] According to this embodiment, by using a concrete floor slab with one level of reinforcement and a wooden surface material made of three-layer, three-ply orthogonal laminated timber, the overall weight is reduced as much as possible, and a composite floor with excellent transportability, handling, and construction properties can be formed. [Effects of the Invention]
[0031] As can be understood from the above explanation, the composite floor of the present invention can provide a composite floor that has high shear transmission performance between the concrete floor slab and the wooden surface material while reducing both the manufacturing effort and manufacturing costs. [Brief explanation of the drawings]
[0032] [Figure 1] FIG. 1 is a perspective view of an example of a composite floor according to an embodiment, showing a portion of the concrete floor slab broken away. [Figure 2]FIG. 2 is a schematic diagram illustrating the shear transfer performance of an example of a synthetic floor according to an embodiment. [Figure 3] FIG. 10 is a perspective view of another example of a composite floor according to an embodiment, showing a portion of the concrete floor slab cut away. [Figure 4A] FIG. 10 is a diagram illustrating another form of grooves. [Figure 4B] 10A and 10B are diagrams illustrating a configuration in which a wooden panel is provided with metal connectors at its ends. DETAILED DESCRIPTION OF THE INVENTION
[0033] Hereinafter, a synthetic floor according to an embodiment will be described with reference to the accompanying drawings. In this specification and drawings, substantially identical components are designated by the same reference numerals, and redundant description may be omitted.
[0034] [Synthetic floor according to the embodiment] An example of a composite floor according to an embodiment will be described with reference to Figures 1 to 3. Here, Figure 1 is a perspective view of an example of a composite floor according to an embodiment, showing a portion of the concrete floor slab cut away, and Figure 2 is a schematic diagram illustrating the shear transfer performance of an example of a composite floor according to an embodiment. Also, Figure 3 is a perspective view of another example of a composite floor according to an embodiment, showing a portion of the concrete floor slab cut away.
[0035] The composite floor 30 shown in Figure 1 has a wooden panel 10 and a concrete floor slab 20 placed on the upper wide surface 11 of a pair of wide surfaces 11, 12 of the wooden panel 10, and has an outer shape that is a rectangular cuboid when viewed from above.
[0036] The concrete floor slab 20 is provided with two-stage reinforcement, consisting of upper end main reinforcement 24A and lower end main reinforcement 24B (both examples of main reinforcement) extending in the longitudinal direction of the composite floor 30, and distribution reinforcement 25A, 25B arranged inside the upper end main reinforcement 24A and the lower end main reinforcement 24B so as to be perpendicular to them, respectively.
[0037] The wooden surface material 10 in the illustrated example is made of cross-laminated timber (CLT). More specifically, it is made of five-layer, five-ply CLT, which is a laminate of lamina 10A, 10C, and 10E, in which the fiber direction of the wood fibers 15 is set to the longitudinal direction of the composite floor 30, and lamina 10B and 10D, which are arranged between the lamina 10A, 10C, and 10E and in which the fiber direction of the wood fibers is set to the direction perpendicular to the longitudinal direction (an example of a direction intersecting the longitudinal direction).
[0038] In the wood surface material 10, the fiber direction of the wood fibers 15 of the lamina 10A (an example of the area on the concrete slab side) in the top layer is set to the longitudinal direction of the composite floor 30 as described above, and therefore the fiber direction of the lamina 10A is set to the longitudinal direction of the main reinforcement 24 of the concrete slab 20.
[0039] Additionally, the top layer lamina 10A has a plurality of grooves 17 extending in a direction perpendicular to the longitudinal direction of the composite floor 30, spaced apart in the longitudinal direction of the wood surface material 10. In other words, the longitudinal direction of the grooves 17 is perpendicular to the longitudinal direction of the main reinforcement 24 and the fiber direction of the top layer lamina 10A.
[0040] Here, the grooves 17 in the illustrated example have a depth that reaches halfway through the thickness of the uppermost lamina 10A, so that a portion of the lamina 10A remains below the grooves 17. The depth of the grooves 17 is set to a depth that allows the side surfaces 17a of the grooves 17 to resist the shearing force acting thereon, as will be described below, and therefore the side surfaces 17a have a required area for design purposes.
[0041] Furthermore, as shown in the illustrated example, a portion of the lamina 10A remains below the groove 17, which is preferable because it increases the bending rigidity (second moment of area) of the entire wood panel 10 compared to a configuration in which, for example, grooves are provided that are approximately the same depth as the thickness of the lamina 10A. Note that, in addition to the illustrated example, a configuration in which grooves are provided that are approximately the same depth as the thickness of the lamina 10A may also be used.
[0042] A concrete floor slab 20 is fabricated so as to surround the upper wide surface 11 of the wooden surface material 10 and the longitudinal narrow surface 13, whereby a composite floor 30 is fabricated in such a manner that the wooden surface material 10 is accommodated in an accommodation groove 21 below the concrete floor slab 20.
[0043] More specifically, when the wood surface material 10 is accommodated in the accommodation groove 21 of the concrete floor slab 20, multiple strip-shaped cotters 27 that are part of the concrete floor slab 20 each fit into the corresponding groove strips 17.
[0044] In this way, the corresponding strip-shaped cotters 27 of the concrete floor slab 20 fit into each of the multiple grooves 17 of the wood surface material 10, so that each strip-shaped cotter 27 acts as a shear key, allowing the wood surface material 10 and the concrete floor slab 20 to be more firmly integrated.
[0045] The longitudinal ends 32 of the composite floor 30 are also the ends of the concrete floor slab 20, and the undersides of the pair of longitudinal ends 32 of the concrete floor slab 20 are each placed on a pair of beams (steel beams, etc.) not shown that form the building's frame, and are fixed to the beams as necessary.
[0046] Here, the concrete slab 20 may be an on-site concrete slab formed by pouring concrete on-site, or a precast concrete slab manufactured in a factory, etc. The latter type is superior in quality, with the entire concrete slab 20 being as homogeneous as possible, and is also superior in workability, since construction can be completed on-site by simply installing the composite floor 30 on a pair of beams (not shown).
[0047] As shown in Figure 2, when a shear force Q acts on a composite floor 30 installed on a pair of beams (not shown) that form the frame of a building, a proportional shear force S is applied to the side surface 17a of each groove 17 of the top layer lamina 10A from the band-shaped cotter 27, with each groove 17 individually bearing the shear force Q.
[0048] In the illustrated example of the wood surface material 10, the fiber direction of the wood fibers 15 of the top layer lamina 10A, in which the grooves 17 are provided, is set in the longitudinal direction of the main reinforcement 24 in the concrete floor slab 20, and the longitudinal direction of the grooves 17 is set in a direction perpendicular to the fiber direction.Therefore, the strength and rigidity of the lamina 10A (side surface 17a of the grooves 17) is relatively higher in the fiber direction than in the direction perpendicular to the fiber direction, and the lamina 10A (side surface 17a of the grooves 17) with such high rigidity or strength resists the apportioned shear force S acting from the cotter 27.
[0049] As a result, for example, a composite floor 30 having high shear transmission performance (exhibiting a high composite effect) between the concrete floor slab 20 and the wooden surface material 10 can be formed using only the groove 17 and the strip-shaped cotter 27 inserted therein, without using lag screws, stud dowels, etc.
[0050] According to the inventors' verification, it has been demonstrated that when a load is borne in the direction (side surface) of the wood fibers of a wooden surface material, compared to a load borne in the direction (side surface) perpendicular to the direction of the wood fibers, the former can bear about four times as much load as the latter. Therefore, as in the illustrated example, the top lamina 10A that receives the shear force from the cotter 27 has the rigidity and strength to withstand a shear force about four times greater than when the fiber direction is perpendicular.
[0051] The composite floor 30 has a component, the concrete floor slab 20, which is equipped with two-stage reinforcement, so that the thickness of the concrete floor slab 20 can be set relatively thick, resulting in a composite floor with excellent sound insulation and fire resistance.
[0052] In designing the composite floor 30 shown in the illustration, one of the following design methods can be applied: a design method in which the short-term strength, long-term strength, and deflection of the composite floor 30 are entirely determined by the concrete floor slab 20 (first design method); a design method in which the short-term strength and long-term strength are entirely determined by the concrete floor slab 20 (second design method); or a design method in which the short-term strength is entirely determined by the concrete floor slab 20 (third design method).
[0053] In the first design method, the performance of the wood surface material 10 is expected as an additional performance to all of the short-term strength, long-term strength, and deflection performance of the composite floor 30, and since these are set only by the concrete floor slab 20, this is the safest design method.
[0054] On the other hand, the third design method takes into account the performance of the wood surface material 10 when determining the long-term strength and reducing deflection of the composite floor 30, and only the short-term strength is determined by the concrete floor slab 20 alone, making it the most rational design method.
[0055] Figure 3 shows a composite floor 30A that differs from the composite floor 30 in that it has a concrete floor slab 20' with one layer of reinforcement, consisting of multiple main reinforcements 24C in one layer and multiple distribution reinforcements 25C arranged above each main reinforcement 24C, and the wood surface material 10' is made of three-layer, three-ply orthogonal laminated timber.
[0056] The composite floor 30A has a component, the concrete floor slab 20', which is equipped with a single layer of reinforcement, so the thickness of the concrete floor slab 20' can be set relatively thin, and the overall weight is reduced as much as possible, resulting in a composite floor with excellent transportability and handling properties.
[0057] Here, as shown in FIG. 4A, a configuration may be adopted in which a plurality of recesses 17b are provided at intervals along the longitudinal direction of the groove 17 on the side surface 17a of each groove 17 provided in the top layer lamina 10A.
[0058] According to this configuration, in addition to the general portion of the groove 17, a portion of the concrete slab 20 also enters the recess 17b as a cotter, thereby further improving the shear transmission performance between the concrete slab 20 and the wooden surface material 10.
[0059] Also, as shown in Figure 4B, a connecting metal fitting 40 having an extension portion 42 extending outward (toward the end portion 32) is attached via a connector 45 to the wide surface 11 of the wood surface material 10 above the narrow surface 13 on the end portion 32 side of the composite floor 30.
[0060] The connecting hardware 40 in the illustrated example is formed from steel plate, and the connecting hardware 40 has multiple (three in the illustrated example) holes for connecting devices (not shown), and connecting devices 45 are hammered through each of the connecting device holes to connect the connecting hardware 40 to the wide surface 11 of the narrow surface 13 of the wood panel 10.
[0061] Here, the metal joint 40 may be a flat steel plate as shown in the illustrated example, or may be a steel plate bent into an L-shape. Furthermore, the metal joint 40 may be made of stainless steel or the like, plated or painted, or may be a cast member. The connector 45 may be a wood screw, nail, lag screw, coach bolt, or coach screw. If the metal joint 40 can be firmly joined to the wood panel 10 with an adhesive, the adhesive may be used instead of a connector.
[0062] According to the form shown in Figure 4B, the extension portion 42 of the connecting metal fitting 40, which is parallel or approximately parallel to the direction of extension of the wide surface 11 of the wooden surface material 10, is embedded in the end portion of the concrete floor slab 20.In addition to the wooden surface material 10 and the concrete floor slab 20 being integrated by the connecting metal fitting 40, the extension portion 42 acts as a catch to prevent the wooden surface material 10 from falling or peeling off from the concrete floor slab 20.
[0063] Also, although not shown in the figure, screws, lag screws, etc. may be driven into the bottom or side of the groove 17, or into the wide surface 11 or narrow surface 13 of the wooden surface material 10, and some of them may be buried inside the concrete floor slab 20 (or cotter 27).
[0064] The present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form.
[0065] For example, the wood surface materials 10, 10' that make up the composite floors 30, 30A in the illustrated example are five-layer, five-ply or three-layer, three-ply CLT, but they may also be formed from CLT of a form other than that shown in the illustrations, such as four-layer, four-ply or five-layer, seven-ply.
[0066] Furthermore, the wooden surface panels 10, 10' may be made of solid wood, width-jointed wood, NLT, DLT, etc., in addition to CLT. [Explanation of symbols]
[0067] 10,10':Wood surface material 10A: Lamina (area on the concrete slab side) 10B~10E: Lamina 11: Upper broad surface (wide surface) 12: Lower broad surface (broad surface) 13: Narrow surface in the longitudinal direction (narrow surface) 15: Wood fiber 17: Groove 17a: Side 17b: Recess 20,20': Concrete floor slab 21: Storage groove 24: Main reinforcement 24A: Upper main reinforcement (main reinforcement) 24B: Bottom main bar (main bar) 24C: Main reinforcement 25,25A,25B,25C: Distribution bar 27: Cotter (strip cotter) 30,30A:Synthetic floor 32: End (longitudinal end) 40: Metal joints 42: Extension part 45: Connector (wood screw) Q: Shear force S: Proportional shear force
Claims
1. A composite floor having a wooden surface material and a concrete floor slab provided with main reinforcement and distribution reinforcement, the concrete slab being disposed on the upper wide surface of a pair of wide surfaces of the wooden surface material, A groove is provided on the upper wide surface of the wooden surface material, and a strip-shaped cotter that is part of the concrete floor slab is inserted into the groove, The fiber direction in the area of the wood surface material on the concrete floor slab side where the groove is provided is set to the longitudinal direction or approximately the longitudinal direction of the main reinforcement, A synthetic floor characterized in that the longitudinal direction of the grooves is set in a direction that intersects with the fiber direction.
2. 2. A composite floor as described in claim 1, characterized in that the longitudinal direction of the grooves and the fiber direction in the area on the concrete deck side are perpendicular to each other.
3. The wood surface material is a cross-laminated lumber in which a plurality of laminas are laminated so that their fiber directions alternately cross each other, A composite floor as described in claim 1 or 2, characterized in that the grooves are provided in the lamina of the top layer of the cross-laminated timber, and the fiber direction of the lamina of the top layer is set in the longitudinal direction or approximately the longitudinal direction of the main reinforcement.
4. The wood surface material is one of width-jointed lumber, nail-jointed laminated lumber, and wood dowel-jointed laminated lumber, which are formed by arranging a plurality of laminas in the width direction with their respective fiber directions aligned, A composite floor as described in claim 1 or 2, characterized in that the grooves are provided above either the width-jointed timber, nail-jointed laminated timber, or wood dowel-jointed laminated timber, and the fiber direction of the lamina is set in the longitudinal direction or approximately the longitudinal direction of the main reinforcement.
5. 3. The composite floor according to claim 1 or 2, wherein the concrete floor slab is a precast concrete floor slab.
6. The short-term and long-term strength and deflection of the composite floor are determined solely by the concrete slab; or The short-term and long-term strength of the composite floor is determined solely by the concrete slab, or 3. A composite floor according to claim 1, wherein the short-term bearing capacity of the composite floor is determined solely by the concrete floor slab.
7. 3. The composite floor according to claim 1, wherein the main reinforcement includes upper end main reinforcement and lower end main reinforcement, and the upper and lower distribution reinforcement cross the upper end main reinforcement and the lower end main reinforcement, respectively, so that the concrete floor slab has two-stage reinforcement.
8. 3. A composite floor as described in claim 1 or 2, characterized in that the concrete floor slab has a first-stage reinforcement in which the main reinforcement is arranged at the center or approximately the center in the thickness direction of the concrete floor slab and the main reinforcement is located below the distribution reinforcement.
9. The concrete floor slab has a first-stage reinforcement in which the main reinforcement is arranged at the center or approximately the center in the thickness direction of the concrete floor slab and the main reinforcement is located below the distribution reinforcement, 4. The composite floor according to claim 3, wherein the cross-laminated lumber is three layers, three plies.
Citation Information
Patent Citations
Load bearing plate member
JP2017078307A