JP4396535B2 - Laying flooring and floor construction structure using it - Google Patents

Description

  The present invention relates to a floor covering material and a floor construction structure using the same.

  Conventionally, longitudinal flooring materials are arranged in the width direction on the floor base, and the actual joint portions provided at the end portions of the adjacent floor materials in the width direction are spread in a state of being actually coupled to each other. Since this flooring does not use an adhesive, energy saving can be achieved (see, for example, Patent Document 1).

  By the way, in a system in which a plurality of floor materials are actually joined in the width direction, warpage in the width direction, unevenness, corrugation, cupping, etc. (hereinafter referred to as “width warp”) occur due to expansion of the floor material in the width direction. It becomes easy. Therefore, the back surface groove is deeply cut along the length direction on the back surface of the base material to prevent occurrence of the warp of the base material.

However, when the back surface groove is cut deeply, a phenomenon (hereinafter referred to as “shadow”) appears that the back surface groove appears as a black shadow on the surface of the decorative plate. In particular, the decorative board has recently been mainly used in light-colored tones, so that shadows are easily noticeable through the decorative board, resulting in a problem that the design of the floor surface is impaired.
Japanese Utility Model Publication No. 5-42484

  The present invention has been invented in view of the above-described conventional problems, and has a simple structure, can be made inconspicuous due to a back surface groove appearing on the surface of the decorative board, and has a superior flooring material having an excellent appearance. Providing laying floor materials that can prevent the occurrence of mold and ticks by preventing the generation of mold and mites, and can further reduce the cushioning properties of the flooring, and simplify the laying work. In addition, it is possible to prevent the occurrence of see-through and push-up phenomenon over time, further suppress the expansion and contraction and width warpage due to moisture and heat, further reduce the construction cost, and facilitate remodeling. It is an object to provide a floor construction structure excellent in construction quality in addition to saving construction and cost reduction as a result of improving water resistance at the actual joint after construction.

In order to solve the above-described problems, in the present invention, in the flooring material in which the decorative board 3 is laminated on the long base material 2, the surface 3 a of the decorative board 3 is arranged along the length direction A. A front surface groove 4 is provided, and a back surface groove 5 for preventing warpage is provided along the same length direction at the position of the back surface 2f of the substrate 2 facing the front surface groove 4 and directly below the front surface groove 4. The interior space of the back groove 5 is filled with a soft resin 20 from the depth of the back groove 5 to about 1/4 to about 1/2 .

  By adopting such a configuration, the back surface groove 5 is cut only at a position directly below the surface groove 4, so that the black shadow of the back surface groove 5 is canceled by the surface groove 4 and appears on the surface 3 a of the decorative plate 3. The shadow of the back surface groove 5 can be made inconspicuous.

Further, since the soft resin 20 is filled in the inner space of the back groove 5 from about 1/4 to about 1/2 of the depth of the back groove 5 , the soft resin 20 can further prevent the back groove 5 from being cast. In addition, even if water is spilled on the floor, the soft resin 20 can prevent moisture from penetrating from the back surface 2f of the base material 2 to the thin surface layer portion 2g above the back surface groove 5, and the flooring material due to moisture penetration This is effective in preventing warpage of the entire 1. Furthermore, by filling the back surface groove 5 with the soft resin 20, the overall flooring material 1 can be kept flexible, and a flooring material 1 with a “waist” can be obtained, and a vibration absorbing effect, a heat insulating effect, Each of the soundproofing functions is improved.

  The substrate 2 is composed of a plurality of plywoods 2a to 2e, and the back groove 5 is preferably cut from the back surface 2f side so as to reach the second plywood 2b on the front side. By leaving the back surface groove 5 while leaving the first-layer plywood 2a on the front surface side, the plywood 2a to 2e constituting the base material 2 is cut out, and the width warpage preventing effect can be enhanced.

  Moreover, it is preferable to attach the waterproof cushion sheet 30 so as to straddle the back surface groove 5 on the back surface of the base material 2, and in this case, the lower end side of the back surface groove 5 is covered with the waterproof cushion sheet 30, Even if water is spilled on the flooring 1, the waterproof cushion sheet 30 can block the water from reaching the back side of the base material 2, thereby causing mold on the back side of the base material 2 due to dampness. Generation of ticks and mites can be prevented, and the waterproof cushion sheet 30 itself has a waterproof property, so that the cushioning property is not deteriorated, and the walking feeling of the flooring 1 can be kept good for a long time. become. Furthermore, by attaching the waterproof cushion sheet 30 to the back surface of the base material 2 in advance, it is not necessary to fix the waterproof cushion sheet 30 to the floor base 8 so as not to move during construction, and the laying operation can be further simplified. Is.

  Further, in the floor construction structure according to the present invention, the actual joint portion 6 is provided at the end in the width direction B orthogonal to the length direction A of the above-described flooring material 1, and the flooring material 1 is attached to the floor base 8. It is characterized in that only the actual connecting portions 6 of the flooring materials 1 adjacent to each other in a free state are bonded to each other with an adhesive 7.

  By adopting such a configuration, the flooring material 1 can be made to adhere to the movement of the flooring material 1 by actually bonding the flooring material 1 so that the shadow of the back surface groove 5 is not noticeable when viewed from the front surface 3a side of the decorative board 3. It is possible to reduce the size and prevent the occurrence of see-through and push-up phenomenon over time. In addition, because the flooring material 1 is not nailed, the expansion and contraction of the floor base material 8 and the expansion and contraction of the flooring material 1 can be separated, and the expansion and warpage caused by moisture and heat can be suppressed. In addition, the installation flooring material 1 can be easily peeled off at the time of renovation, and the renovation such as replacement and repair of the installation flooring material 1 can be simplified. Moreover, the water intrusion from the actual coupling portion 6 can be prevented after construction, and the water resistance at the actual coupling portion 6 can be improved.

In the flooring material according to the present invention, the front surface groove and the back surface groove are formed at opposite front and back positions, and the inner space of the back surface groove is filled with a soft resin to a depth of about 1/4 to about 1/2 of the back surface groove. With a simple configuration, the black shadow on the back surface groove is canceled out by the surface groove, making the shadow inconspicuous and improving the design of the floor surface.

  In addition, the floor construction structure according to the present invention prevents the occurrence of see-through and push-up phenomenon over time by connecting the flooring material that can make the shadow of the back groove appearing on the surface of the decorative board inconspicuous with the actual bonding method. In addition, the expansion and contraction and width warpage caused by moisture and heat can be suppressed, the construction cost can be further reduced, the remodeling can be facilitated, and the water resistance at the actual joint after construction can be improved. In addition to saving construction and reducing costs, a floor construction structure with excellent construction quality can be realized.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

1 to 6 show the basic configuration of the present invention. FIG. 1 shows an example of a long flooring material 1 (hereinafter abbreviated as “floor material 1”) in which a decorative plate 3 is laminated on a base material 2.

  The substrate 2 is composed of, for example, five layers (ply) of plywood 2a to 2e. For example, as shown in FIG. 1, a plywood 2a in which fibers are arranged in the length direction A (perpendicular to the paper surface of FIG. 1) The plywood specification arranged in the first layer or the plywood specification in which the plywood 2a in which fibers are arranged in the width direction B as shown in FIG. In addition, the number of layers of the plywood 2a to 2e is not limited to 5 plies, and may be multiple layers such as 7 plies and 9 plies, for example. In addition, the width dimension D in FIGS. 1 and 4 is, for example, 303 mm, and the total thickness d1 is, for example, 12.0 mm. Moreover, the material of the base material 2 is not limited to plywood, but may be MDF composite plywood (not shown) obtained by laminating a hard resin plate and MDF (medium density fiberboard).

  The decorative board 3 is composed of a hard wood single board, for example, in order to enhance load resistance. A surface groove 4 is provided along the length direction A on the surface 3 a of the decorative plate 3. A plurality of the surface grooves 4 are provided at intervals in the width direction B of the decorative board 3. The front surface groove 4 serves to improve the design of the floor surface in such a way that shadows due to the back surface groove 5 described later do not stand out. The surface groove 4 is not limited to the V-shaped groove and may be a square groove.

  A back surface groove 5 extending in a direction parallel to the front surface groove 4 (length direction A) is provided at the position of the back surface 2 f of the base material 2 facing the front surface groove 4 of the decorative plate 3. Here, as shown in FIG. 1 or FIG. 4, the back surface groove 5 is cut into a deep groove slit shape from the back surface 2f side so as to leave only the first-layer plywood 2a on the front surface side. That is, the back surface groove | channel 5 is cut | disconnected so that it may reach the 2nd-layer plywood 2b of the surface side, and the state by which the stiffness of the plywood 2a-2e which comprises the base material 2 was cut | disconnected (the whole plywood 2a-2e is It is in a state where it can be slightly moved by hand along the back surface groove 5), and width warpage can be effectively prevented. Here, the depth d2 of the back surface groove 5 is, for example, 9.3 mm, and the groove width is, for example, about 1.6 to 1.8 mm. In the example shown in FIG. 3, the remaining width d3 of both ends in the length direction A of the back surface groove 5 is set to 30 to 50 mm, for example.

  The depth of the back surface groove 5 is not limited to the example of FIGS. 1 and 4, and the back surface groove 5 is cut so as to leave the plywood 2 b up to the second layer (or the third layer or more) on the front surface side. May be. Moreover, the dimension of the back surface groove | channel 5 in the length direction A is the length direction A both ends other than the uncut specification (FIG. 5A) which consists of a through groove provided over the length direction A full length of the decorative board 3. It is selected from specifications that leave only the part (FIGS. 3 and 5B), and specifications that leave both ends and the center part in the length direction A (FIG. 5C). Here, in FIGS. 5A to 5C, the groove pitch P of the back surface groove 5 is set to, for example, 75.5 mm to 101 mm. 5B and 5C, the remaining dimensions at both ends and the remaining widths d3 and d3 ′ at the center are set to 200 to 300 mm, for example. The groove pitch P of the back surface groove 5 is set equal to the groove pitch of the front surface groove 4, but the groove width, groove depth, and cross-sectional shape of the back surface groove 5 can be appropriately changed in design.

  Both ends in the length direction A of the base material 2 are chamfered, and both ends in the width direction B orthogonal to the length direction A are subjected to actual processing. In this example, the male fruit 6a protrudes from one end of the plywood 2b, 2c in the width direction B, and the female fruit 6b is recessed from the other end.

  Thus, according to the flooring 1 of the present invention, the back surface groove 5 is cut only at a position directly below the front surface groove 4, so the black shadow of the back surface groove 5 is canceled by the front surface groove 4, and the decorative plate 3 The shadow of the back surface groove 5 appearing on the front surface 3a can be made inconspicuous. And since the direction of the back surface groove | channel 5 is the same as the length direction A (grain direction), a shadow becomes much less conspicuous, As a result, the front surface groove | channel 4 and the back surface groove | channel 5 are formed in the front and back position which opposes. The design of the floor surface can be improved with a simple configuration. In addition, since the floor material 1 can be bent by the back surface groove 5, even if the floor base 8 is uneven, the floor material 1 can sufficiently cope with it.

  FIG. 2 shows an example of a state in which the flooring 1 having the above configuration is constructed. The floor base 8 in FIG. 2 is made of, for example, mortar, concrete, or crushed. In the figure, 10 is a skirting board and 11 is a wall. In the example of FIG. 2, the male seed 6 a and the female seed 6 b of the floor material 1 that are adjacent to the floor base 8 are bonded together with an adhesive 7. However, since only the bonding of the actual connecting portion 6 is likely to cause cupping or floor noise, a buffer sheet 9 is inserted between the floor base 8 and the floor material 1. The buffer sheet 9 is formed of a cushioning material such as PE or urethane that prevents absorption of sound and moisture, for example. The buffer sheet 9 is, for example, 1.0 mm to 3.0 mm thick and has a cushioning property, so that a gap corresponding to the uneven shape of the floor foundation 8 does not occur between the floor foundation 8 and the flooring 1, The floor structure is improved when walking and the feet are not tired. Further, the buffer sheet 9 of this example is not bonded to the back surface 2 f of the flooring 1. That is, when the back surface groove 5 of the flooring 1 is adhered in a sealed state with the buffer sheet 9, the inner space of the back surface groove 5 becomes a sealed space, and there is a problem that floor noise occurs in the sealed space during walking. The material 1 and the buffer sheet 9 are in a free state.

  When warping occurs in the length direction A of the flooring 1 during construction, the temporary nail is driven into and fixed to the actual coupling portion 6 after the actual coupling portion 6 is bonded. By fixing the temporary nail in this manner, the adhesive 7 can be cured with smoothness. Accordingly, even if the temporary nail is pulled out after the adhesive is cured, the same smooth state can be maintained.

  An example of the actual coupling portion 6 of this example is shown in FIG. 6A, and a conventional actual coupling portion 6 ′ is shown in FIG. 6B. Conventionally, as shown in FIG. 6B, an angle θ ′ (for example, 2 ° to 3 °) is provided between the upper surface of the male fruit 6a and the upper surface of the female fruit 6b in order to eliminate the see-through. There is a problem that the adhesive area between the upper surface of 6a and the upper surface of the female fruit 6b is reduced and the adhesive holding force is lowered, and the gap d6 (for example, 0.1 to 0.2 mm) between the male fruit 6a and the female fruit 6b is small. Therefore, there is a problem that the fitting is tight, and there is a problem that the adhesive 7 is likely to leak because the gap d4 (for example, 0.5 to 0.7 mm) between the lower surface of the male fruit 6a and the lower surface of the female fruit 6b is large. . On the other hand, in the real coupling part 6 of this example, the lower surface of the male fruit 6a and the lower surface of the female fruit 6b are arranged so that the upper surface of the male fruit 6a and the upper surface of the female fruit 6b can be abutted as shown in FIG. And a gap d7 between the male fruit 6a and the female fruit 6b is increased to 0.2 to 0.3 mm, for example. As a result, the angle θ between the upper surface of the male fruit 6a and the upper surface of the female fruit 6b becomes 0 °, and it is possible to eliminate the see-through and to increase the contact area. Can be reduced. Further, since the gap d7 (for example, 0.2 to 0.3 mm) between the male fruit 6a and the female fruit 6b is larger than the conventional one, the adhesive 7 can be filled more and the fitting can be prevented from being tight. Furthermore, since the gap d5 (for example, 0 to 0.5 mm, preferably 0 to 0.2 mm) between the lower surface of the male fruit 6a and the lower surface of the female fruit 6b can be made smaller than before, the adhesive 7 is less likely to leak. It is possible to eliminate the problem that 7 leaks to form a bridge and floor noise occurs.

  As the adhesive 7, an adhesive material that exhibits a hard property when cured, such as a modified acrylic emulsion adhesive, is used, which has the property of improving water resistance with modified vinyl acetate. Of course, this is only an example, and other hard adhesive materials may be used. In addition, a soft adhesive is not suitable from the viewpoint of increasing the strength of the actual connecting portion 6. The application amount of the adhesive 7 is not particularly limited, but for example, g / 30 cm (both long and short) is a guide.

  Thus, the floor material 1 is connected only by the bonding of the actual connecting portion 6, and by adopting the construction without nails, the expansion and contraction of the floor base 8 and the expansion and contraction of the floor material 1 are separated, and the expansion and contraction due to moisture and heat The generation of warpage can be suppressed, and the construction cost can be reduced by about 1/3 compared to the case of nailing. Further, since the floor material 1 is not bonded to the floor base 8, it is possible to reduce the construction, and at the time of renovation, the floor material 1 can be easily peeled off, and the renovation such as replacement and repair of the floor material 1 becomes easy.

  Moreover, the movement of the flooring 1 can be reduced by the actual bonding method of the base material 2 by the actual bonding method, and the occurrence of see-through and push-up phenomenon over time can be prevented. Furthermore, after construction, water intrusion from the actual connection portion 6 can be prevented, and water resistance at the actual connection portion 6 can be improved. As a result, in addition to saving construction and reducing costs, construction quality can be improved.

7 and 8 show an example of an embodiment of the present invention, and a soft resin 20 is filled in the internal space of the back surface groove 5. Other configurations are the same as the basic configurations of FIGS. 1 to 6, and corresponding portions are denoted by the same reference numerals. 8A shows a case where the back surface groove 5 is cut deeply from the surface to the first layer, and FIG. 8B shows a case where the back surface groove 5 is cut from the surface to the second layer. In this example, the soft resin 20 is filled from the depth of the back groove 5 to about 1/4 to about 1/2. Examples of the soft resin 20 include rubber resins, SBR (styrene / butadiene copolymer) resins, and the like. As an example of the SBR resin, a modified styrene / butadiene copolymer latex is used.

Thus, in this example, the back surface groove 5 is cut only at a position directly below the surface groove 4 as in the basic configuration , so that the black shadow of the back surface groove 5 is canceled out by the surface groove 4, and the surface of the decorative plate 3. The shadow of the back surface groove 5 appearing in 3a can be made inconspicuous, and furthermore, by filling the inner part of the back surface groove 5 with the soft resin 20, an effect of further preventing the shadow of the back surface groove 5 can be obtained.

  As shown in FIG. 9 (reference diagram), it is possible to provide the back surface groove 5 at a back surface position that does not face the front surface groove 4, but in order to sufficiently suppress the shadowing, as shown in FIG. It is desirable to provide the back surface groove 5 filled with the soft resin 20 at the position of the back surface 2 f facing the front surface groove 4.

  Further, in this example, since the soft resin 20 is filled in the upper part of the back surface groove 5, moisture does not permeate from the back surface 2 f of the base material 2 to the thin surface layer portion 2 g of the back surface groove 5. That is, even when a plurality of flooring materials 1 are integrally connected by actual bonding, if water is spilled on the floor, the side end surface where the water that has entered from the actual bonding portion is not waterproofed of the base material 2 Or it goes around from the back surface 2 f to the back surface groove 5, travels through the back surface groove 5, and easily penetrates into the surface layer portion 2 g above the back surface groove 5. For this reason, the strength of the thin surface layer portion 2g (particularly, the portion where moisture penetrates) at the upper part of the back surface groove 5 is weak, and when the force concentrates on that portion, the portion expands and contracts. Cause it to occur. Therefore, in the present invention, the soft resin 20 is filled in the upper part of the back groove 5 without a gap, so that the penetration of moisture into the thin surface layer portion 2g on the back groove 5 can be reliably prevented by the soft resin 20, and as a result, The soft resin 20 has a function of suppressing shadowing and a function of suppressing moisture permeation from the back surface 2f of the base material 2 to the surface layer portion 2g above the back surface groove 5. The effect of improving the appearance of the surface and the effect of preventing warpage of the entire flooring 1 by suppressing the expansion and contraction of the surface layer portion 2g above the back surface groove 5 are obtained.

  In addition, since the deformation of the flooring 1 can be followed by the elastic force of the soft resin 20, the flexibility of the entire flooring 1 can be maintained and the advantage that the flooring 1 having a “waist” can be obtained is obtained. There is also an advantage that the vibration absorbing effect, the heat insulating effect, and the soundproofing function can be improved in the back surface groove 5.

  By the way, when changing a Japanese-style room between apartments in Western countries, mortar 8a is applied on the floor for the purpose of leveling or reinforcing the flooring 1 and dried after a certain time (for example, about 1 to 2 hours). It waits until it hardens | solidifies, Then, the flooring 1 is spread | laid on the surface of the mortar 8a. However, if the mortar 8a is left undried and the flooring 1 is laid, the moisture contained in the mortar 8a wets the flooring 1 and deteriorates the durability of the flooring 1 itself. The problem that mold and mites occur.

Therefore, as another basic configuration of the present invention, as shown in FIGS. 10 and 11, the flooring 1 in which the waterproof cushion sheet 30 is attached to the back surface of the base material 2 so as to straddle the back surface groove 5 is used. To do. The configuration in which the back surface groove 5 is cut directly below the front surface groove 4 and the point where the adjacent base material 2 is actually joined and bonded are the same as in the basic configuration and the embodiment described above, The same reference numerals are assigned and detailed description is omitted. The waterproof cushion sheet 30 of this example possesses cushioning properties and waterproofness, and is attached over the entire back surface of the substrate 2. In addition, you may attach partially, straddling each back surface groove | channel 5 instead of the whole back surface. The thickness of the waterproof cushion sheet 30 is, for example, 1.0 mm to 3.0 mm, and is bonded to the back surface of the substrate 2 with an adhesive. In addition, although the thing about 9.0 mm-15 mm in thickness is used as the base material 2, of course, it is not limited to this thickness.

  Thus, since the waterproof cushion sheet 30 is bonded to the back surface side of the substrate 2 so as to straddle each back surface groove 5, the lower end side of each back surface groove 5 is covered with the waterproof cushion sheet 30, respectively. Even if water is spilled on the flooring 1, the waterproof cushion sheet 30 can block the water from reaching the back side of the base material 2, thereby causing mold on the back side of the base material 2 due to dampness. Since the waterproof cushion sheet 30 itself has a waterproof property, the cushioning property is not deteriorated and the feeling of walking of the flooring 1 can be kept good over a long period of time. Further, when the mortar 8a is undried, the moisture of the mortar 8a can be blocked by the waterproof cushion sheet 30, so that it is possible to prevent deterioration of the durability of the base material 2 itself and to further prevent the occurrence of mold and mites. In addition, since it is not necessary to wait until the mortar 8a is sufficiently dry during construction, the construction period can be greatly shortened.

  In addition, in this example, since the waterproof cushion sheet 30 is preliminarily bonded to the back surface of the base material 2, it is not necessary to fix the waterproof cushion sheet 30 so as not to move with respect to the surface of the mortar 8a during construction. There is also an advantage that the laying work can be simplified.

  By the way, when a non-waterproof cushioning material is attached to the back surface of the base material 2, moisture and water are likely to permeate, causing defects such as mold and mites on the floor, and deterioration of cushioning properties due to moisture. Arise. In addition, it is conceivable to further lay a waterproof cover under a non-waterproof cushioning material, but in this case, there is a troublesomeness to lay the waterproof cover. On the other hand, in this example, there is no problem as described above.

  Furthermore, in this example, as shown in FIG. 11, the baseboard 10 is attached to the lower end portion of the wall surface 11, and the end portion of the flooring 1 is inserted between the lower end portion of the baseboard 10 and the surface of the mortar 8a. It has become. Here, the end face 30 d in the width direction of the waterproof cushion sheet 30 is flush with the end face in the width direction of the base material 2. Thereby, there is no gap through which moisture passes between the wall surface 11 and the waterproof cushion sheet 30, and water permeates from the base material 2 side to the mortar 8a side along the wall surface 11, or from the mortar 8a side to the base material 2 side. Moisture permeation into the water is blocked, and the waterproofing effect on the wall surface 11 side can be enhanced. Further, in order to abut the waterproof cushion sheet 30 between the adjacent floor materials 1 and 1 without any gaps, the waterproof cushion sheet 30 is flush with the end surface below the male 6a of one floor material 1. End 30c (FIG. 30)) is cut out, and the end face 30a after the waterproof cushion sheet 30 is cut out projects into the end face 30b of the waterproof cushion sheet 30 below the female body 6b of the other flooring 1. I try to guess. Thereby, it becomes possible to abut against the cushion sheets 30 and 30 for waterproofing between the adjacent floor materials 1 and 1 without any gap, and between the adjacent floor materials 1 and 1, the male fruit 6a and the female fruit 6b. There is also an advantage that the waterproofing effect between the adjacent flooring materials 1 and 1 can be enhanced because the waterproofing can be doubled by joining and the abutment of the waterproof cushion sheet 30.

  The flooring material according to the present invention and the floor construction structure using the flooring material can be widely applied to the fields of office floor double flooring, condominium flooring, and detached flooring.

It is sectional drawing of the flooring material of the basic composition of this invention. It is sectional drawing of the other example of the flooring material same as the above. It is a bottom view of the laying floor material same as the above. It is sectional drawing of the construction state of an installation floor material same as the above. (A)-(c) is explanatory drawing of the different specification of a back surface groove | channel same as the above. (A) is explanatory drawing of the coupling | bonding state of the real coupling part same as the above, (b) is a reference drawing of the coupling | bonding state of the conventional real coupling part. It is an example of an embodiment of the present invention, and is a sectional view of a construction state of a flooring material in which a soft resin is filled in an internal space of a back surface groove . (A) is an enlarged view of an example of the back surface groove | channel filled with the soft resin same as the above, (b) is an enlarged view of another example. FIG. 8 is a reference diagram related to the embodiment of FIG. 7 of the present invention. FIG. 6 is a cross-sectional view of a flooring material that is still another basic configuration of the present invention and is attached with a waterproof cushion sheet so as to straddle a back surface groove. It is sectional drawing explaining an example of the construction state of FIG.

DESCRIPTION OF SYMBOLS 1 Laying flooring material 2 Base material 2a-2e Plywood 2f Back surface 3 Decorative plate 3a Front surface 4 Front surface groove 5 Back surface groove 6 Actual bonding part 7 Adhesive 20 Soft resin 30 Waterproof cushion sheet A Length direction B Width direction

Claims (4)

In the flooring material in which a decorative board is laminated on a base material, a surface groove is provided along the length direction on the surface of the long decorative board, and the back surface position of the base material is opposed to the surface groove. A back groove for preventing warping is provided along the same length direction limited to a position directly below the front groove, and soft resin is placed in the inner space of the back groove with a depth of about 1/4 to about 1/2 of the back groove. Laying floor material characterized by being filled to the extent . 2. The flooring material according to claim 1, wherein the base material is made of a plurality of plywoods, and a back surface groove is cut from the back surface side so as to reach a second layer of plywood on the front surface side . The flooring material according to claim 1 or 2, wherein a waterproof cushion sheet is attached to the back surface of the base material so as to straddle the back surface groove . The state which provided the real joint part in the edge part of the width direction orthogonal to the length direction of the laying floor material in any one of Claims 1 thru | or 3, and laid the laying floor material freely with respect to the floor ground And the floor construction structure characterized by adhere | attaching only the actual connection part of an adjacent flooring material with an adhesive agent.

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