JP2019060117A - Fiber-reinforced plastic floor panel - Google Patents

Abstract

To provide a fiber reinforced plastic floor panel capable of improving brittle fracture behavior of fiber reinforced plastics without requiring a separate member and expanding the application range of a material of buildings.SOLUTION: A fiber reinforced plastic floor panel of the present invention has a ridge on its back surface. The ridges are formed in a straight line shape. The ridges are formed to extend continuously from one end to the other end of the fiber reinforced plastic floor panel. The fiber reinforced plastic floor panel has a square shape surrounded by two short sides and two long sides, and the ridges extend parallel to the long side. A plurality of ridges are provided at intervals.SELECTED DRAWING: Figure 1

Description

  The present invention relates to floor panels, and in particular to fiber reinforced plastic floor panels.

  BACKGROUND Conventionally, fiber reinforced plastics (FRP) have been used as materials for buildings. Fiber-reinforced plastic (FRP) is widely used in buildings such as housing equipment because it is inexpensive and lightweight, and has good durability and load resistance.

  Materials used in buildings are required to have deformability. This is because the energy absorption amount of the structural body when an external force is input to the structural body of the building is determined by the product of the force and the deformation amount. Therefore, by increasing the amount of energy absorption of the structure, it is possible to enhance the deformability of the material and prevent the sudden failure of the building.

  However, FRP materials are brittle materials and have no plastic region. Therefore, FRP materials with low deformation performance have a problem that the application range to materials of buildings is limited.

  Therefore, a floor panel in which a reinforcing member is incorporated in the panel is described, for example, in JP-A-9-170263 (Patent Document 1) as a means for compensating the brittleness of FRP and expanding the application range to materials of buildings. ing.

  In the floor panel described in Patent Document 1, a metal plate having a folded portion formed around the periphery thereof is sandwiched and integrally formed in a substantially flat panel body made of FRP.

  In such a floor panel, the FRP panel is reinforced by providing a structure in which a metal plate is sandwiched and integrated inside the FRP panel, and the load resistance thereof is improved, and the long-term use is achieved. Also, due to the anchor effect of the folded portion and the improvement effect of the bending strength, it is difficult for the reinforcing material and the panel to peel off, and the load resistance is provided.

JP-A-9-170263

  However, in the floor panel described in Patent Document 1, reinforcing metal is incorporated as a separate member, and improvement in brittle fracture behavior of fiber reinforced plastic (FRP) itself is not considered at all. There was a problem that.

  Therefore, in view of such circumstances, the present invention can improve the brittle fracture behavior of fiber reinforced plastic (FRP) without the need for a separate member, and broaden the scope of application to materials of buildings. Aims to provide a fiber reinforced plastic floor panel that can

  The fiber reinforced plastic floor panel according to the present invention is characterized by having a ridge on the back surface.

  As described above, fiber reinforced plastic (FRP) is a brittle material and lacks a plastic region, so it has poor deformability. Thus, for example, when a fiber reinforced plastic is used for the floor panel, when the loading load is applied to the floor panel, the back surface of the floor panel is usually completely broken after the load reaches the maximum load. The load will be reduced as it is.

  According to the fiber reinforced plastic floor panel of the above configuration, the fiber reinforced plastic fiber bundle gradually breaks when a load is applied to the fiber reinforced plastic floor panel, because the floor has a ridge. , Successive destruction occurs. That is, with respect to the application of the load, the ridges on the back surface become the starting point of the sequential destruction, and the ridges on the back surface are initially destroyed. And, even after the load reaches the maximum load, since the floor panel has a certain level of deformation performance, the amount of deformation of the floor panel can be increased by increasing the amount of energy absorption.

  That is, since the floor panel has the ridges on the back surface, the fracture of the back surface occurs after sequential failure of the ridges, so that although it is a brittle material, the floor panel hardly causes a drop in load. The amount of deformation of

  Thereafter, even if the ridges are completely broken, the back surface of the panel is not broken, so the rigidity is reduced, but the load is not reduced, and the amount of deformation is further increased. Eventually, the back of the panel also breaks and the load decreases, but the amount of deformation before the load decreases is larger than that of a normal floor panel.

  As a result, it is possible to improve the brittle fracture behavior of the fiber reinforced plastic material by providing the fiber reinforced plastic material with a deformability without requiring a separate member, and to extend the scope of application to building materials. it can.

  Moreover, the under-floor space formed on the back surface by the ridges can be used, for example, as a space for arranging a pipe or the like.

  As another aspect of the present invention, the fiber reinforced plastic floor panel has a rectangular shape surrounded by two short sides and two long sides, and the ridges extend in parallel with the long sides. Is preferred.

  According to the fiber reinforced plastic floor panel of the above configuration, the fiber reinforced plastic floor panel has a rectangular shape surrounded by two short sides and two long sides, and the ridges are parallel to the long sides Since it is extended, when loading load is applied to the floor panel, sequential failure in the ridges is efficiently generated on the ridges extending in parallel with the long side to prevent the brittle fracture in the long side direction of the floor panel It is possible to further increase the amount of deformation in the long side direction of the back surface until the breakage of the back surface occurs after sequential failure of the ridges occurs.

  In still another aspect of the present invention, it is preferable that a plurality of the ridges are provided at intervals.

  According to the fiber reinforced plastic floor panel of the above configuration, since the plurality of projections are provided at intervals, successive failures in the projections can be generated more efficiently throughout the floor panel. It is possible to further increase the amount of deformation of the back surface until breakage of the back surface occurs, and to effectively prevent the brittle fracture of the floor panel.

  As still another aspect of the present invention, the fiber reinforced plastic floor panel includes the back surface layer having the back surface, a surface layer spaced apart from the back surface layer, the back surface layer, and the surface layer. Preferably, the intermediate layer has a rib portion formed in a lattice shape and a core portion formed between the rib portions.

  The fiber reinforced plastic floor panel of the above configuration comprises a back surface layer having a back surface, a front surface layer spaced apart from the back surface layer, and an intermediate layer provided between the back surface layer and the front surface layer. Since the intermediate layer has rib portions formed in a lattice and a core portion formed between the rib portions, when an external bending load is applied from the surface layer to the back layer, the rib portions And while a core part absorbs load efficiently, load can be efficiently transmitted from a surface layer to a back layer, and a brittle fracture of a floor panel can be prevented still more effectively.

  In still another aspect of the present invention, the surface layer includes glass fiber reinforced plastic or carbon fiber reinforced plastic, the rib includes carbon fiber reinforced plastic, the core includes foam acrylic, and the back The layer preferably comprises carbon fiber reinforced plastic.

  According to the fiber reinforced plastic floor panel of the above configuration, since the surface layer contains glass fiber reinforced plastic or carbon fiber reinforced plastic, it is inexpensive and lightweight to form a floor panel having good durability and load resistance. Can. In addition, since glass fiber reinforced plastic is less expensive than carbon fiber reinforced plastic, the cost can be further reduced. In addition, since the rib portion contains a carbon fiber reinforced plastic, when an external bending load is applied from the surface layer to the back surface layer, the rib portion efficiently absorbs the bending load and the surface layer to the back surface layer In addition, the bending load can be efficiently transmitted. In addition, since the core portion contains foam acrylic, the core portion can absorb bending load more efficiently, and can transmit bending load more efficiently from the surface layer to the back layer. In addition, since the back surface layer contains carbon fiber reinforced plastic, it is possible to form a floor panel that is inexpensive and lightweight, and has good durability and load resistance.

As still another aspect of the present invention, the compressive elastic modulus of the surface layer is E, the second moment of area is I, the tensile strength of the back layer is σ, the cross section is A, and the thickness of the surface layer is h ₁ Assuming that the thickness of the back surface layer is h ₂ , the width of the front surface layer and the back surface layer is b, and the width between the rib portions is L _r , the buckling load of the surface layer is 4 × π ² EI _{/ L} ^{r 2 _{(However, I = bh 1 3/12}} ) with represented by a tensile load of said back surface layer is represented by sigma × a (provided _{that, a = bh 2), 4} × π 2 It is preferable that EI / L _r ² > σ × A.

As described above, since the glass fiber reinforced plastic is less expensive than the carbon fiber reinforced plastic, the cost can be further reduced. In the fiber reinforced plastic floor panels of the above construction, the buckling load of the surface _{^{layer, 4 × π 2 EI / L}} r 2 ( ^{_{However, I = bh 1 3/12}} ) together with the represented by the backing layer tensile load Is expressed as σ × A (where A = bh ₂ ) and 4 × π ² EI / L _r ² > σ × A, the buckling load of the surface layer is made larger than the tensile load of the back surface layer Thus, it is possible to cause sequential destruction from the back surface layer and not to destroy from the front surface layer.

  As described above, according to the fiber reinforced plastic floor panel of the present invention, the brittle fracture behavior of the fiber reinforced plastic material can be improved without the need for a separate member, and the range of application to a building material can be expanded. It is possible to produce excellent effects such as being able to

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the whole structure of the fiber reinforced plastic floor panel which concerns on one Embodiment of this invention. It is an exploded perspective view of a fiber reinforced plastic floor panel concerning one embodiment of the present invention. It is the schematic of the fiber reinforced plastic floor panel for the first floor of the building used as comparison object of the fiber reinforced plastic floor panel which concerns on one Embodiment of this invention. FIG. 1 is a schematic view of a fiber reinforced plastic floor panel for a second floor of a building according to an embodiment of the present invention. It is the schematic of the measuring apparatus used in the structural performance confirmation test of the fiber reinforced plastic floor panel which concerns on one Embodiment of this invention. It is a figure which shows the result in the structural performance confirmation test of the fiber reinforced plastic floor panel for the first floors of the building shown in FIG. It is a figure which shows the fracture condition in the structural performance confirmation test of the fiber reinforced plastic floor panel for the first floors of the building shown in FIG. It is a figure which shows the result in the structure performance confirmation test of the fiber reinforced plastic floor panel for 2nd floor of the building which concerns on one Embodiment of this invention. It is a figure which shows the breaking condition in the structural performance confirmation test of the fiber reinforced plastic floor panel for 2nd floor of the building which concerns on one Embodiment of this invention.

  Hereinafter, an outline of a fiber reinforced plastic floor panel according to an embodiment of the present invention will be described with reference to the attached drawings.

  The fiber reinforced plastic floor panel according to the present embodiment is to be installed in, for example, a house, an apartment house, a hotel, a building, a hospital, a station, and the like.

  The fiber reinforced plastic floor panel according to the present embodiment contains a fiber reinforced plastic (FRP). Fiber reinforced plastic is a composite material in which fiber bundles are contained in plastic (resin) to improve strength, and the fibers and resin used are not particularly limited.

  Examples of the fibers to be used include glass fibers, carbon fibers, aramid fibers, polyethylene fibers, zylon fibers, boron fibers and the like. In the present embodiment, it is preferable to use glass fiber or carbon fiber. Moreover, as resin used, thermosetting resins, such as a polyester resin, a vinyl ester resin, an epoxy resin, a phenol resin, a thermoplastic resin etc. are mentioned, for example.

  As shown in FIGS. 1 (a), (b) and FIG. 2, the fiber reinforced plastic floor panel 100 according to the present embodiment is provided with a space between the back surface layer 10 having the back surface 10a and the back surface layer 10. And an intermediate layer 12 provided between the back surface layer 10 and the surface layer 11. The fiber reinforced plastic floor panel 100 has a total length L length.

  The surface layer 11 and the back surface layer 10 may each be composed of a single layer or a plurality of layers, but have a layer formed of a glass fiber reinforced plastic and / or a carbon fiber reinforced plastic. Is preferred. For the surface layer 11 and the back layer 10, for example, a carbon fiber reinforced plastic layer and a glass fiber reinforced plastic layer may be alternately laminated.

  In the present embodiment, the surface layer 11 includes glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP).

  In the present embodiment, the back surface layer 10 contains carbon fiber reinforced plastic (CFRP).

  Glass fiber reinforced plastic (GFRP) has lower resistance to concentrated load compared to carbon fiber reinforced plastic (CFRP). Therefore, in order for GFRP to have the same durability and load resistance as CFRP, it is necessary to increase the thickness of GFRP.

In the present embodiment, when the surface layer 11 comprises a glass fiber reinforced plastic (GFRP), as shown in FIG. 1, the thickness _{h 1} of the surface layer 11 is greater than the thickness _{h 2} of the back layer 10. For example, when the thickness of the carbon fiber reinforced plastic (CFRP) is about 2.4 mm, the strength can be balanced by setting the thickness of the glass fiber reinforced plastic (GFRP) to 5 mm.

  The fiber reinforced plastic floor panel 100 according to the present embodiment has a ridge 13 on the back surface 10 a. In the present embodiment, the ridges 13 are formed in a straight line.

  The ridges 13 are formed to extend continuously from one end 100 a to the other end 100 b of the fiber reinforced plastic floor panel 100. More specifically, in the present embodiment, the fiber reinforced plastic floor panel has a rectangular shape surrounded by two short sides 14a and 14b and two long sides 14c and 14d, and the ridge 13 It extends parallel to the long sides 14c and 14d.

  A plurality of protrusions 13 are provided at intervals. In the present embodiment, two protrusions 13 are provided at intervals, and a first protrusion 13a extending along one long side 14c and a second protrusion extending along the other long side 14d are provided. And a protrusion 13b.

  In the present embodiment, the ridges 13a and 13b are formed at the ends in the direction of the short sides 14a and 14b.

  The intermediate layer 12 has rib portions 12 a formed in a lattice shape and a core portion 12 b formed between the rib portions 12 a. The core portion 12 b includes a foam such as foam acrylic.

  The rib portion 12a is preferably formed of a fiber reinforced plastic, and more preferably formed of a carbon fiber reinforced plastic. The core portion 12 b includes a heat insulating material.

  The heat insulating material is provided in the void portion of the rib portion 12a, and preferably has heat insulation performance, sound insulation performance and the like, and is preferably lightweight. As the heat insulating material, for example, a foam such as foamed acrylic is used.

The compressive elastic modulus of the surface layer 11 is E, the second moment of area is I, the tensile strength of the back surface layer 10 is σ, and the cross sectional area is A, as shown in FIGS. 1 and 4. Assuming that h ₁ is the thickness of the back surface layer 10 h ₂ , the width of the surface layer 11 and the back surface layer 10 is b, and the width between the rib portions 12 a is L _r , the buckling load of the surface layer 11 is ^{_{4 × π 2 EI / L r}} 2 ( ^{_{However, I = bh 1 3/12}} ) together with the represented by the tensile load of the back layer 10 is represented by sigma × a (provided that, a = bh _2), 4 × is a ^{_{π 2 EI / L r 2>}} σ × a.

That is _{^{4 × π 2 Ebh 1 3 /}} 12L r 2> σ × bh 2, the buckling load of the surface layer 11 is proportional to the cube of the thickness _{h 1} of the surface layer 11. Thus, it can be seen that it is more effective to increase the thickness h ₁ of the surface layer 11 than to increase the compressive elastic modulus E of the surface layer 11 from the viewpoint of strength. Although the buckling load of the surface layer 11 and the tensile load of the back surface layer 10 are basically calculated using the total length L of the fiber reinforced plastic floor panel 100, the rib portion of the fiber reinforced plastic floor panel 100 is If 12a is provided, the total length L can be calculated instead of the width L _r between the rib portions 12a.

  The back surface layer 10 is preferably thin, and in order not to reduce the overall bending strength, it is preferable to use a material with high tensile strength as the back surface layer 10.

Furthermore, by arranging the rib portion 12a of the intermediate layer 12 in the direction perpendicular to the compression direction, the buckling load of the surface layer 11 and the tensile load of the back surface layer 10 are determined using the width L _r between the rib portions 12a. The buckling load of the surface layer 11 can be increased.

  EXAMPLES The present invention will next be described in more detail by way of examples, which should not be construed as limiting the invention thereto.

<Full-scale bending test using fiber reinforced plastic floor panel>
(Test purpose)
The structural load-bearing performance (holding capacity of self-weight and load capacity) of fiber reinforced plastic floor panel (hereinafter, “floor panel”) is confirmed by a loading test with a practical product (test body).

  In order to use it as a floor panel, it is necessary to check various performances including sound insulation performance and fire protection performance, but this test is the most basic strength test among the required structural strength tests. The purpose is to acquire data for grasping the correlation between full-scale test and rigidity / strength design.

(Test body)
As a test body, a floor panel 200 for a first floor having a width of 910 mm and a length of 1820 mm shown in FIG. 3 and Table 1 below (uniform at 100 mm thickness) Floor panel 100 for second floor having the same width and length shown in FIG. 4 and Table 1 below (thickness 50 mm + with ridges in the direction of long side) (hereinafter, test bodies 2F (1) to (3) )) And 3) were used. In addition, in FIG.3 and FIG.4, the state which remove | eliminated surface layer 11 grade made from glass fiber reinforced plastic (GFRP) etc. is shown for convenience.

(Test method)
Conduct the bending test (span 1700 mm, load span 850 mm) according to JIS A 1414-2 "Performance panel for building panel" using the measuring device shown in Fig. 5, and confirm the load and displacement. The Specifically, each of the test bodies 1F (1) to (3) and the test bodies 2F (1) to (3) is placed on a fulcrum roller arranged at an interval of length L, and the load beam is From the top to the design load (fixed load equivalent + load equivalent equivalent) as a two-point bending load at the center of each test body via a force application point roller located a distance L / 4 away from the fulcrum roller After loading the load, it was unloaded and then loaded to the maximum load. The displacement was measured at a total of 9 points: 3 at the center of the span and 3 at both supporting points. The test results are shown in Table 1 below. In addition, as a test body, the thing of 10 mm or less of bending at the time of design load and bending / span <= 1/300 at the time of design load was adopted.

  (Test results)

(Test result of test body 1F (1) to (3))
As shown in Table 1, in the test pieces 1F (1) to (3), the deflection at the design load is 1.87 mm to 2.03 mm, and the deflection / span at the design load is 1/909 to 1/854. Met.

  As shown in Table 1 and FIG. 6, the maximum loads in the test bodies 1F (1) to (3) were 43.4 kN, 40.3 kN and 47.0 kN, respectively. As shown in FIG. 6, the initial stiffness (indicated by the dotted line in FIG. 6) is higher than that of the test bodies 2F (1) to (3), but as shown in FIG. In addition, it can be seen that the back surface layer 10 (back surface 10a) is completely broken, and the load applied is reduced as it is.

(Test result of test body 2F (1) to (3))
As shown in Table 1, in the test bodies 2F (1) to (3), the deflection at the design load is 3.43 mm to 3.65 mm, and the deflection / span at the design load is 1/496 to 1/466. Met.

  As shown in Table 1 and FIG. 8, the maximum loads in the test bodies 2F (1) to (3) were 47.6 kN, 50.5 kN and 39.9 kN, respectively. As shown in FIG. 8, although the initial stiffness (indicated by the dotted line in FIG. 8) is as low as about half of the test bodies 1F (1) to (3), the toughness and the maximum load are high. After the loading load reaches the maximum load, first, the fiber bundles of the FRP are gradually broken at the ridges 13 of the back surface layer 10 (back surface 10a), so that successive breakage occurs.

  That is, with respect to the application of the load, the ridges 13 of the back surface layer 10 (back surface 10a) become the starting point of the sequential destruction, and the ridges 13 of the back surface layer 10 (back surface 10a) are destroyed first. And, even after the load reaches the maximum load, the deformation of the floor panel 100 can be achieved by increasing the amount of energy absorption since the test bodies 2F (1) to (3) (floor panel 100) have a certain level of deformation performance. The amount can be increased.

  That is, since the floor panel 100 has the ridges 13 on the back surface layer 10 (back surface 10a), the fracture of the back surface layer 10 (back surface 10a) occurs after the breakage of the ridges 13 occurs sequentially, so that the brittleness Although it is a material, the amount of deformation of the floor panel 100 is increased with almost no load reduction.

  After that, even if the ridges 13 are completely broken, the back surface layer 10 (back surface 10a) of the panel is not broken, so the rigidity is reduced, but the load is not reduced, and the amount of deformation is further increased. Go. As shown in FIG. 9, although the ridges 13 are broken, it can be seen that the back layer 10 (the back surface 10a) is only partially broken, and the deformation performance is improved.

  Although the back surface layer 10 (back surface 10a) of the panel also fractures over time, the load decreases, but the amount of deformation before the load decreases as compared to the floor panel 200 of (1F (1) to (3)) Generally, the load-displacement curve in FIG. 8 shows a deformation behavior like a ductile material.

  As described above, according to the fiber reinforced plastic floor panel 100 according to the present embodiment, the floor panel has the ridges on the back surface layer 10 (rear surface 10a), so that the ridges 13 are sequentially destroyed. Since breakage of the back surface layer 10 (back surface 10a) occurs, the deformation amount of the floor panel 100 is increased while hardly causing a load reduction even though it is a brittle material.

  After that, even if the protrusion 13 is completely broken, the back layer 10 (back surface 10a) of the floor panel 100 does not break, so the rigidity decreases, but the load does not decrease, and the amount of deformation further increases I will. Eventually, the back surface layer 10 (back surface 10a) of the floor panel 100 also breaks and the load decreases, but the amount of deformation until the load decreases is larger than that of a normal floor panel.

  As a result, it is possible to improve the brittle fracture behavior of the fiber reinforced plastic material by providing the fiber reinforced plastic material with a deformability without requiring a separate member, and to extend the scope of application to building materials. it can.

  The underfloor space formed on the back surface layer 10 (back surface 10a) by the ridges 13 can be used, for example, as a space for disposing piping and the like.

  Further, the sequential destruction in the ridges 13 efficiently occurs linearly, and after the sequential destruction of the ridges 13 occurs, the rear surface layer 10 (rear surface 10a) until the fracture of the rear surface layer 10 (rear surface 10a) occurs. Can be further increased.

  In addition, the sequential destruction in the ridges 13 occurs more efficiently from the one end 100 a to the other end 100 b of the floor panel 100 as a whole, and after the sequential destruction of the ridges 13 occurs, the back surface layer 10 (back surface The deformation amount of the back surface layer 10 (back surface 10a) until the breakage of 10a) occurs can be further increased.

  In addition, the sequential fracture in the ridge 13 efficiently occurs in the ridge 13 extending in parallel with the long sides 14c and 14d, and the brittle fracture in the direction of the long sides 14c and 14d of the floor panel 100 can be prevented. The deformation amount in the direction of the long sides 14c and 14d of the back surface layer 10 (back surface 10a) until the back surface layer 10 (back surface 10a) is generated after the sequential destruction of 13 occurs can be further increased.

  In addition, the sequential fracture in the ridges 13 can be more efficiently generated throughout the floor panel 100, and deformation of the back surface layer 10 (back surface 10a) until breakage of the back surface layer 10 (back surface 10a) occurs. The amount can be further increased, and the brittle fracture of the floor panel 100 can be effectively prevented.

  Further, sequential destruction in the ridge 13 can be more efficiently generated over the peripheral region (end) of one long side 14c and the peripheral region (end) of the other long side 14d, The amount of deformation in the direction of long sides 14c and 14d of the back surface layer 10 (back surface 10a) until breakage of the layer 10 (back surface 10a) occurs can be further increased, and brittle fracture in the direction of long sides 14c and 14d of the floor panel 100 You can prevent it more efficiently.

  Moreover, while the rib part 12a and the core part 12b absorb a load efficiently, a load can be efficiently transmitted to the back layer 10 from the surface layer 11, and the brittle fracture of the floor panel 100 is prevented further more effectively. be able to.

  When glass fiber reinforced plastic is used as the surface layer 11, the cost can be further reduced because glass fiber reinforced plastic is less expensive than carbon fiber reinforced plastic.

  Further, the rib portion 12 a can efficiently absorb the bending load and can efficiently transmit the bending load from the surface layer 11 to the back surface layer 10.

  Moreover, while the core part 12b absorbs a bending load more efficiently, a bending load can be more efficiently transmitted to the back surface layer 10 from the surface layer 11. As shown in FIG.

  Further, by setting the buckling load of the surface layer 11 to be larger than the tensile load of the back surface layer 10, the back surface layer 10 can be sequentially broken, and the surface layer 11 is not broken.

  The fiber reinforced plastic floor panel of the present invention is not limited to the above embodiment, and it goes without saying that the floor panel of the present invention can be appropriately modified without departing from the scope of the present invention.

  In the said embodiment, although the protrusion 13 is formed in linear form, it is not limited to this, For example, you may form in curvilinear form. The point is that when load is applied, the ridges 13 become the starting point of the sequential failure, and even after the ridges 13 are broken, the back surface layer 10 has a certain degree of deformability and brittle fracture of the floor panel 100 It may be any configuration that can be prevented.

  In the above embodiment, the ridge 13 is formed at the end in the direction of the short sides 14a and 14b, but is not limited to this. For example, the protrusion 13 is formed at the end in the direction of the long sides 14c and 14d May be Alternatively, the ridges 13 may be formed at the ends in the direction of the short sides 14a and 14b and in the direction of the long sides 14c and 14d. The point is that when load is applied to the ridges 13, the ridges 13 become the starting point of sequential failure, and even after the ridges 13 are broken, the back surface layer 10 has a certain degree of deformation performance, and the floor panel Any configuration that can prevent the brittle fracture of 100 may be used.

  In the above embodiment, the fiber reinforced plastic floor panel 100 has a rectangular shape surrounded by the two short sides 14a and 14b and the two long sides 14c and 14d, but is not limited to this. Absent. For example, the fiber reinforced plastic floor panel 100 may have a circular shape, a polygonal shape, or the like.

  In that case, when load is applied to the ridge 13, the ridge 13 becomes the starting point of the successive destruction, and the back surface layer 10 has a certain level of deformation performance even after the ridge 13 is broken, and the floor panel Any configuration that can prevent the brittle fracture of 100 may be used.

  In the above embodiment, the ridges 13 extend in parallel with the short sides 14a and 14b, but the present invention is not limited thereto, and the ridges 13 may extend in parallel with the short sides 14a and 14b. .

  In the said embodiment, the surface layer 11 and the back surface layer 10 may be formed with the same FRP material, and may be formed with a different FRP material. For example, it may have a plurality of CFRP layers using different types of carbon fibers and a plurality of GFRP layers using different types of glass fibers. When the surface layer 11 and the back surface layer 10 are formed of different FRP materials, the strength of the GFRP layer can be balanced by making the thickness of the GFRP layer larger than the thickness of the CFRP layer.

  In the above embodiment, although the protrusion has two protrusions extending along the long sides 14c and 14d, the present invention is not limited to this, and the protrusion 13 has the short sides 14a and 14b and / or the long One or three or more may be formed along the sides 14c and 14d.

  The intermediate layer 12 has rib portions 12a formed in a lattice shape, and the rib portion 12a has the core portion 12b inside, but the shape and material of the rib portion 12a are limited to the above configuration Absent.

  The point is that the rib portion 12a can efficiently absorb the loading load from the surface layer 11 and can efficiently transmit the loading load from the surface layer 11 to the back surface layer 10, and the brittle fracture of the floor panel 100 can be further enhanced. It may be any configuration that can be effectively prevented. Moreover, the shape and material of the core part 12b are also the same.

  The fiber reinforced plastic floor panel of the present invention is effectively applied to floor panels disposed in buildings such as houses, apartments, hotels, buildings, hospitals, and stations.

  10 back surface layer 10a back surface 11 surface layer 12 middle layer 12a rib portion 12b core portion 13 ridge 13a first ridge 13b second ridge 14a, 14b short side 14c, 14d Long side, 100 fiber reinforced plastic floor panel, 100a one end, 100b the other end.

Claims (6)

  Fiber reinforced plastic floor panel with ridges on the back side.   The fiber reinforced plastic floor panel has a rectangular shape surrounded by two short sides and two long sides, and the ridges extend in parallel with the long sides. Fiber reinforced plastic floor panel.   The fiber reinforced plastic floor panel according to claim 1 or 2, wherein a plurality of the ridges are provided at intervals.   The fiber reinforced plastic floor panel comprises the back surface layer having the back surface, a surface layer spaced apart from the back surface layer, and an intermediate layer provided between the back surface layer and the surface layer. The fiber reinforced plastic floor according to any one of claims 1 to 3, wherein the intermediate layer has rib portions formed in a lattice shape and a core portion formed between the rib portions. panel.   The surface layer includes glass fiber reinforced plastic or carbon fiber reinforced plastic, the rib includes carbon fiber reinforced plastic, the core includes foam acrylic, and the back layer includes carbon fiber reinforced plastic The fiber reinforced plastic floor panel according to claim 4. The compression elastic modulus of the surface layer to E, the geometrical moment of inertia is I, the tensile strength of the back layer sigma, the cross-sectional area is A, the thickness of the surface layer is h _1, the thickness of the back layer h _2, and the width of the surface layer and the back layer is b, when the width between the ribs and the L _r, buckling load of the surface ^{layer, 4 × π 2 EI / L} r 2 ( However, together represented by ^{_{I = bh 1 3/12)}} , tensile load of the back layer, sigma × a (however, represented by _{a = bh 2), 4 ×} π 2 EI / L r 2> σ × a The fiber reinforced plastic floor panel according to claim 4 or 5, wherein

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