Unevenness adjusting sheet for double floors and double floor structure provided therewith

Abstract

To provide an unevenness adjusting sheet for double floors, which enables efficient removal of floor substrate materials.SOLUTION: An unevenness adjusting sheet for double floors 12a has a plurality of floor substrate materials 10 laid on one surface side of a floor slab F with a space S from the floor slab F, and a plurality of floor finishing materials 14 laid on the other surface side via a removable and re-adhesive adhesive 13. The boundaries between adjacent floor substrate materials 10 are arranged so that they can be seen from the other surface side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a level adjustment sheet for a double floor and a double floor structure equipped with the same. [Background technology]

[0002] In recent years, with the spread of office automation (OA) equipment in buildings and other structures, double floors known as OA floors or free access floors, which house the wiring for OA equipment under the floor, have become mainstream.

[0003] For example, Patent Document 1 discloses a tile-type antistatic flooring material in which a conductive substrate and a synthetic resin surface layer, both of which have a predetermined resistance value, are laminated in that order on a backing synthetic resin layer having a predetermined resistance value, and which is laid on a free access floor using an acrylic emulsion-based pressure-sensitive adhesive. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 4-30506 Summary of the Invention [Problem to be solved by the invention]

[0005] However, on the surface of a double floor, where multiple underfloor materials are laid in a matrix, there is a risk of unevenness occurring between adjacent underfloor materials, and during renovation, unevenness may occur due to deformation of the underfloor material itself or adhesion of an existing adhesive called peel-up bond, so it is possible to adjust the unevenness by placing an unevenness adjustment sheet between the surface of the double floor and the floor finishing material. In that case, for example, when redoing the wiring under the floor during renovation, it becomes difficult to grasp the position of the underfloor material under the unevenness adjustment sheet, and more underfloor material will be removed than necessary, so there is room for improvement.

[0006] The present invention has been made in consideration of the above points, and its object is to provide an unevenness adjustment sheet for double floors that allows the floor underlayment to be efficiently removed. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the unevenness adjustment sheet for double floors of the present invention is an unevenness adjustment sheet having a plurality of floor underlay materials laid on one surface side on a floor slab with a space between the floor slab and the floor slab, and a plurality of floor finishing materials laid on the other surface side via a removable and re-adhesive adhesive, characterized in that the boundaries between adjacent floor underlay materials are arranged so that they can be seen from the other surface side.

[0008] According to the above configuration, a plurality of floor underlay materials laid on a floor slab are provided on one surface side (e.g., the lower side) of the double floor unevenness adjustment sheet, and a plurality of floor finishing materials are laid on the other surface side (e.g., the upper side) of the double floor unevenness adjustment sheet via a removable and re-adhesive adhesive. Therefore, for example, when redoing the wiring under the floor during renovation, the target plurality of floor finishing materials are peeled off to expose the double floor unevenness adjustment sheet with the removable and re-adhesive adhesive applied to its surface. Here, the double floor unevenness adjustment sheet is provided so that the boundaries between the adjacent floor underlay materials can be seen from the other surface side, so that the arrangement of the floor underlay materials on the lower side can be grasped from the upper side of the double floor unevenness adjustment sheet. Note that the removable and re-adhesive adhesive is applied uniformly and thinly using, for example, a sponge roll, and many of them become transparent when dry, so they do not prevent the visibility of the boundaries between the floor underlay materials. This makes it possible to select the floor underlayment material that needs to be removed and placed below it from the upper side of the double floor unevenness adjustment sheet, thereby providing a double floor unevenness adjustment sheet that allows the floor underlayment material to be removed efficiently.

[0009] Furthermore, the unevenness adjusting sheet for double floors according to the present invention may be transparent or semi-transparent.

[0010] According to the above configuration, the double floor unevenness adjustment sheet is transparent or translucent, so that the boundary between adjacent floor underlayment materials placed above and below the double floor unevenness adjustment sheet can be specifically seen.

[0011] Furthermore, the unevenness adjusting sheet for double floors according to the present invention may be opaque and have a plurality of through holes penetrating in the thickness direction.

[0012] According to the above configuration, even if the double floor unevenness adjustment sheet is opaque, the double floor unevenness adjustment sheet has a plurality of through holes that penetrate in the thickness direction, so that the boundaries between adjacent floor underlayment materials placed from the upper side of the double floor unevenness adjustment sheet to the lower side can be specifically seen.

[0013] In addition, the double floor structure of the present invention is characterized in that it comprises the above-mentioned double floor unevenness adjustment sheet, a plurality of floor underlay materials provided on one surface side of the above-mentioned double floor unevenness adjustment sheet and laid on the floor slab with a space between the floor slab and the floor underlay materials, and a plurality of floor finishing materials laid on the other surface side of the above-mentioned double floor unevenness adjustment sheet via a removable and re-adhesive adhesive.

[0014] According to the above configuration, since the unevenness adjusting sheet for double floors is provided on the plurality of floor underlay materials laid on the floor slab, even if a step occurs between adjacent floor underlay materials, or unevenness occurs due to deformation of the floor underlay material itself or adhesion of an existing adhesive called peel-up bond, the step or unevenness can be eliminated or mitigated. Then, a plurality of floor finishing materials are laid on the unevenness adjusting sheet for double floors via a removable and re-adhesive adhesive. Therefore, for example, when the wiring under the floor is redone during renovation, the unevenness adjusting sheet for double floors, which has a removable and re-adhesive adhesive applied to its surface, is exposed by peeling off the plurality of target floor finishing materials. Here, the unevenness adjusting sheet for double floors is provided so that the boundary between adjacent floor underlay materials can be seen from the other surface side, so that the arrangement of the floor underlay materials on the lower side (one surface side) of the unevenness adjusting sheet for double floors can be grasped from the upper side (other surface side) of the unevenness adjusting sheet for double floors. In addition, adhesives that can be peeled off and re-adhered are applied evenly and thinly using, for example, a sponge roll, and many of them become transparent when dry, so they do not prevent the visibility of the boundaries between the floor underlayments. This makes it possible to select the floor underlayment that needs to be removed from the top of the double floor unevenness adjustment sheet, thereby providing a double floor structure that allows the floor underlayment to be efficiently removed.

[0015] The adhesive may be transparent or translucent.

[0016] According to the above configuration, the adhesive is transparent or translucent, so that the boundary between adjacent floor underlayment materials placed above and below the double floor unevenness adjustment sheet can be easily seen.

[0017] A removable and re-adhesive adhesive may be provided between the multiple floor underlayment materials and the double floor unevenness adjustment sheet.

[0018] According to the above configuration, a removable and re-adhesive adhesive is provided between the multiple floor underlayment materials and the double floor unevenness adjustment sheet, so that the double floor unevenness adjustment sheet can be easily laid on top of the multiple floor underlayment materials laid on the floor slab.

[0019] Each of the underfloor materials may be provided with an openable and closable lid material of a different color from the respective underfloor materials.

[0020] According to the above configuration, each underfloor material is provided with an openable and closable lid material in a color different from the underfloor material. For example, by providing a lid material in a more noticeable color such as red or blue for an underfloor material in a less noticeable color such as black or gray, not only can the boundaries between adjacent underfloor materials that are placed from above to below the double floor unevenness adjustment sheet be visually identified, but the lid material provided on the underfloor material can be easily visually identified.

[0021] The end faces of each of the above floor finishing materials do not need to be subjected to this processing.

[0022] According to the above configuration, since the end faces of each floor finishing material are not subjected to the real processing, there are concerns about unevenness between adjacent floor finishing materials, deformation of the floor base material itself, and unevenness caused by the adhesion of an existing adhesive called peel-up bond, but these unevenness and unevenness can be eliminated or alleviated by the unevenness adjustment sheet for double floors that is attached to the underside of each floor finishing material via a removable and re-adhesive adhesive. Also, since the end faces of each floor finishing material are not subjected to the real processing, partial replacement of floor finishing materials can be easily performed.

[0023] The plurality of underfloor materials may be arranged in a matrix.

[0024] According to the above configuration, multiple underfloor materials are arranged in a matrix, so that the boundaries between adjacent underfloor materials extend in a straight line. Therefore, for example, when redoing underfloor wiring during renovation, the target underfloor material can be easily removed. Effect of the Invention

[0025] According to the present invention, since the unevenness adjustment sheet is arranged so that the boundary between adjacent floor underlayment materials can be seen from the other surface side, it is possible to provide an unevenness adjustment sheet for double floors that allows the floor underlayment materials to be efficiently removed. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a cross-sectional view of a double floor unevenness adjustment sheet according to a first embodiment of the present invention and a double floor structure equipped with the same. [Diagram 2] FIG. 4 is a plan view of a double floor unevenness adjustment sheet that constitutes a double floor structure relating to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiments.

[0028] First Embodiment Fig. 1 shows a first embodiment of a double floor unevenness adjusting sheet according to the present invention and a double floor structure provided with the same. Here, Fig. 1 is a cross-sectional view of a double floor unevenness adjusting sheet 12a of this embodiment and a double floor structure 20 provided with the same.

[0029] As shown in Figure 1, the double floor structure 20 comprises a plurality of floor underlay materials 10 laid in a matrix on a floor slab F with a space S between the floor slab F, a double floor unevenness adjustment sheet 12a provided on the plurality of floor underlay materials 10 with an adhesive 11 interposed therebetween, and a plurality of floor finishing materials 14 laid on the double floor unevenness adjustment sheet 12a with an adhesive 13 interposed therebetween.

[0030] The floor slab F is formed, for example, from a concrete slab of the floor surface of each room in an office building.

[0031] The floor underlayment 10 is, for example, made of a rectangular concrete or metal panel measuring approximately 500 mm long x 500 mm wide in plan view. The floor underlayment 10 is supported at its four corners by posts 10p (see FIG. 1) that are provided upright on the surface of the floor slab F. The posts 10p are provided with, for example, a screw-type height adjustment mechanism. Note that, although a post-type floor underlayment 10 is exemplified in this embodiment, the floor underlayment 10 may be, for example, a laid-on type.

[0032] The adhesives 11 and 13 are, for example, made of a removable adhesive called a peel-up bond, which is removable and re-adhesive. Here, the adhesives 11 and 13 become almost transparent after being applied and dried, but may be transparent or translucent before being applied and dried. In the double floor structure 20 of this embodiment, the adhesive 11 may be omitted.

[0033] The unevenness adjusting sheet for double floors 12a is transparent or semi-transparent, and is provided so that the boundaries between adjacent floor underlayment materials 10 can be visually confirmed. Here, the unevenness adjusting sheet for double floors 12a is composed of a resin sheet such as a vinyl chloride-based or olefin-based sheet having a thickness of 1 mm to 5 mm. If the unevenness adjusting sheet for double floors 12a is thinner than 1 mm, it becomes difficult to obtain the unevenness adjusting effect of the unevenness adjusting sheet for double floors 12a. If the unevenness adjusting sheet for double floors 12a is thicker than 5 mm, the cross-sectional configuration of the floor needs to be changed.

[0034] The floor finishing material 14 includes, for example, a plate-shaped base material having a thickness of about 4 mm to 6 mm, which contains 20% to 30% by mass of vinyl chloride resin not containing a plasticizer and 70% to 80% by mass of calcium carbonate, a surface decorative layer having a thickness of about 0.2 mm to 0.4 mm, such as a veneer, provided on the surface of the plate-shaped base material, and a buffer layer having a thickness of about 0.2 mm to 0.4 mm, such as a nonwoven fabric, provided on the back surface of the plate-shaped base material. Here, the floor finishing material 14 is provided in a rectangular plate shape in a plan view, and its end faces are vertical end faces perpendicular to the surface in consideration of its attachability and detachability, and the end faces are not subjected to the present processing. In this embodiment, the floor finishing material 14 having four peripheral end faces as vertical end faces is exemplified, but the floor finishing material 14 may have easy-to-remove processing such as a lapidary processing on the end faces of the opposing long sides in consideration of its attachability and detachability.

[0035] With the double floor structure 20 configured as described above, for example, when redoing the underfloor wiring during renovation, the target floor finishing material 14 is peeled off, the boundaries between adjacent underfloor materials 10 that are placed from the top side of the double floor unevenness adjustment sheet 12a to the bottom side are visually confirmed, the underfloor material 10 that needs to be removed is selected, that underfloor material 10 is removed and the underfloor wiring is redone, and then the underfloor material 10, double floor unevenness adjustment sheet 12a and floor finishing material 14 are returned to their original state.

[0036] Next, a method for constructing the double floor structure 20 of this embodiment will be described.

[0037] <Main construction> First, multiple pillars 10p are arranged in a matrix on the floor slab F at intervals that match the size of the floor underlayment material 10 to be used (for example, approximately 500 mm long x 500 mm wide), and then the height of each pillar 10p is adjusted.

[0038] Next, a plurality of underfloor materials 10 are laid so that the four corners of each underfloor material 10 are positioned on the tops of the plurality of supports 10p. Note that the underfloor wiring is installed, for example, on the floor slab F before the underfloor materials 10 are laid.

[0039] Then, an adhesive 11 such as an acrylic emulsion peel-up bond is applied to the surface of the multiple underfloor materials 10 using, for example, a sponge roll, and then dried. After that, a double floor unevenness adjustment sheet 12a, for example, made of a transparent resin sheet made of vinyl chloride and measuring, for example, approximately 3 mm thick x 900 mm long x 1800 mm wide, is attached to the surface.

[0040] Furthermore, an adhesive 13 such as an acrylic emulsion peel-up bond is applied to the surface of the double floor unevenness adjustment sheet 12a, for example using a sponge roll, and then dried. After that, multiple floor finishing materials 14, each approximately 5 mm thick x 135 mm wide x 900 mm long, are attached in an alignment pattern such as a staggered pattern.

[0041] In the manner described above, the double floor structure 20 of this embodiment can be constructed.

[0042] <Renovation work (reworking underfloor wiring)> First, a predetermined floor finish material 14 is peeled off by, for example, using a jig equipped with suction cups to pull the surface of each floor finish material 14 to be placed in the target area.

[0043] Next, the boundaries between adjacent floor underlayment materials 10 arranged from the upper side to the lower side of the double floor unevenness adjustment sheet 12a exposed from the unpeeled floor finishing material 14 are visually inspected to select the floor underlayment materials 10 that need to be removed.

[0044] Thereafter, the unevenness adjusting sheet 12a for double floors on the selected underfloor material 10 is cut out, and then the underfloor material 10 is removed together with the unevenness adjusting sheet 12a for double floors.

[0045] Furthermore, after redoing the underfloor wiring, the floor underlayment material 10 including the cut out unevenness adjustment sheet 12a for double floors and the floor finishing material 14 are returned to their original state.

[0046] In the manner described above, the renovation work for the double floor structure 20 of this embodiment can be carried out.

[0047] As described above, according to the double floor unevenness adjustment sheet 12a of this embodiment and the double floor structure 20 provided with the same, the double floor unevenness adjustment sheet 12a is provided on the multiple floor base materials 10 laid on the floor slab F via the removable and re-adhesive adhesive 11, so that even if a step occurs between adjacent floor base materials 10, or unevenness occurs due to deformation of the floor base material 10 itself or adhesion of the existing adhesive 11, the step or unevenness can be eliminated or mitigated. Then, multiple floor finishing materials 14 are laid on the double floor unevenness adjustment sheet 12a via the removable and re-adhesive adhesive 13. Therefore, for example, when the wiring under the floor is redone during renovation, the multiple target floor finishing materials 14 are peeled off to expose the double floor unevenness adjustment sheet 12a with the removable and re-adhesive adhesive 13 applied to its surface. Here, the unevenness adjusting sheet for double floors 12a is transparent or semi-transparent, so that the boundaries between adjacent floor underlayment materials 10 can be visually confirmed, and the arrangement of the floor underlayment materials 10 on the lower side can be understood from the upper side of the unevenness adjusting sheet for double floors 12a. The adhesives 11 and 13 are applied thinly and uniformly using, for example, a sponge roll, and many of them become transparent when dry, so they do not prevent the visibility of the boundaries between the floor underlayment materials 10. This allows the selection of the floor underlayment materials 10 that need to be removed from the upper side of the unevenness adjusting sheet for double floors 12a on the lower side, and therefore it is possible to provide the unevenness adjusting sheet for double floors 12a and the double floor structure 20 equipped with the sheet, which allow the floor underlayment materials 10 to be efficiently removed.

[0048] Furthermore, according to this embodiment of the unevenness adjustment sheet 12a for double floors and the double floor structure 20 equipped with it, the adhesives 11 and 13 are transparent or translucent, so that the boundaries between adjacent floor underlayment materials 10 arranged from the upper side of the unevenness adjustment sheet 12a for double floors to the lower side thereof can be easily visually confirmed.

[0049] In addition, according to the present embodiment's unevenness adjustment sheet 12a for double floors and the double floor structure 20 equipped with it, a removable and re-adhesive adhesive 11 is provided between the multiple floor underlayment materials 10 and the unevenness adjustment sheet for double floors 12a, so that the unevenness adjustment sheet for double floors 12a can be easily laid on top of the multiple floor underlayment materials 10 laid on the floor slab F.

[0050] In addition, according to the double floor unevenness adjustment sheet 12a of this embodiment and the double floor structure 20 equipped with it, since the end faces of each floor finishing material 14 are not subjected to the actual processing, there is concern about unevenness between adjacent floor finishing materials 14, deformation of the floor base material 10 itself, and unevenness due to the adhesion of the existing adhesive 11, but the unevenness and unevenness can be eliminated or alleviated by the double floor unevenness adjustment sheet 12a provided on the underside of each floor finishing material 14 via a removable and re-adhesive adhesive 13. In addition, since the end faces of each floor finishing material 14 are not subjected to the actual processing, partial replacement of the floor finishing material 14 can be easily performed.

[0051] Furthermore, according to the double floor unevenness adjustment sheet 12a of this embodiment and the double floor structure 20 equipped with it, multiple floor underlayment materials 10 are arranged in a matrix pattern, so that the boundaries between adjacent floor underlayment materials 10 extend in a straight line. Therefore, for example, when redoing underfloor wiring during renovation, the target floor underlayment material 10 can be easily removed.

[0052] Second Embodiment Fig. 2 shows a second embodiment of the double floor unevenness adjusting sheet and the double floor structure provided with the same according to the present invention. Here, Fig. 2 is a plan view of the double floor unevenness adjusting sheet 12b constituting the double floor structure of this embodiment. In the following embodiment, the same parts as those in Fig. 1 are given the same reference numerals, and detailed description thereof is omitted.

[0053] In the above first embodiment, a double floor structure 20 having a transparent or translucent unevenness adjustment sheet 12a for a double floor is exemplified, whereas in this embodiment, a double floor structure having an opaque unevenness adjustment sheet 12b for a double floor is exemplified.

[0054] The double floor structure of this embodiment has a double floor unevenness adjustment sheet 12b instead of the double floor unevenness adjustment sheet 12a that constitutes the double floor structure 20 of the first embodiment described above, and the other configurations are substantially the same as those of the double floor structure 20.

[0055] The unevenness adjusting sheet for double floors 12b is, for example, a 1 mm to 5 mm thick opaque vinyl chloride resin sheet or rubber sheet, and is provided in a rectangular shape in a plan view. In addition, as shown in FIG. 2, the unevenness adjusting sheet for double floors 12b is formed in an oval shape of, for example, about 5 mm wide x 10 mm long in a plan view, and a plurality of through holes H are provided in a staggered pattern in a plurality of rows penetrating in the thickness direction. Here, when a pair of parallel imaginary lines are drawn with an arbitrary point of the unevenness adjusting sheet for double floors 12b as the center along the X-axis direction (for example, the horizontal direction in FIG. 2) and the Y-axis direction (for example, the vertical direction in FIG. 2) that are orthogonal to each other in a plan view, the plurality of through holes H must be present on the imaginary lines of the four sides. Specifically, it is preferable to arrange the through holes H so that the boundaries between the floor underlay materials 10 can be seen approximately every 20 mm to 100 mm or less (preferably every 30 mm to 70 mm) in each of the X-axis direction and the Y-axis direction. In addition, the through holes H may be arranged at equal intervals in the length direction (long axis) of the through holes H as shown in FIG. 2, and the axis of the arrangement may be inclined at about 15° to 75° with respect to the X-axis direction or the Y-axis direction to arrange them in an orderly manner. If the size of the through holes H is too large or there are too many of them, the adhesive strength of the adhesive 13 may decrease. If the size of the through holes H is too small, the adhesive 13 filled in the through holes H may make the boundaries between the floor underlay materials 10 difficult to see or impossible to see, which is not preferable. In addition, although an oval (elliptical) through hole H is exemplified in this embodiment, the through hole H may be a perfect circle, a rectangle, a triangle, or the like. In addition, the through holes H may be formed at the same time as the formation of the unevenness adjusting sheet for double floors itself, or may be formed by punching after the unevenness adjusting sheet for double floors in which the through holes H are not formed. When the sheet is formed by punching, it is preferable to reuse the punched material as the raw material for another unevenness adjustment sheet for double floors.

[0056] Further, a plurality of underfloor materials 10 are arranged in a matrix on the underside of the double floor unevenness adjustment sheet 12b as shown in Fig. 2. Further, on each underfloor material 10, an openable and closable lid material C is provided in a color (e.g., red or blue) different from the color (e.g., gray) of each underfloor material 10 as shown in Fig. 2. Note that the lid material C is provided, for example, as a wiring outlet, and may be provided on each underfloor material 10 constituting the double floor structure 20 of the first embodiment.

[0057] The double floor structure of this embodiment is similar to the double floor structure 20 of the first embodiment described above, and is configured so that, for example, when redoing under-floor wiring during renovation, the target floor finishing material 14 is peeled off, the boundaries between adjacent under-floor materials 10 placed from the top side of the double floor unevenness adjustment sheet 12b to the bottom side are visually confirmed, the under-floor material 10 that needs to be removed is selected, that under-floor material 10 is removed, the under-floor wiring is redone, and then the under-floor material 10, double floor unevenness adjustment sheet 12b and floor finishing material 14 are returned to their original state.

[0058] As described above, according to the double floor unevenness adjustment sheet 12b of this embodiment and the double floor structure including the same, the double floor unevenness adjustment sheet 12b is provided on the multiple floor underlay materials 10 laid on the floor slab F via the removable and re-adhesive adhesive 11, so that even if a step occurs between adjacent floor underlay materials 10, or unevenness occurs due to deformation of the floor underlay material 10 itself or adhesion of the existing adhesive 11, the step or unevenness can be eliminated or mitigated. Then, multiple floor finishing materials 14 are laid on the double floor unevenness adjustment sheet 12b via the removable and re-adhesive adhesive 13. Therefore, for example, when the work of redoing the wiring under the floor during renovation is performed, the multiple target floor finishing materials 14 are peeled off to expose the double floor unevenness adjustment sheet 12b with the removable and re-adhesive adhesive 13 applied to its surface. Here, even if the unevenness adjustment sheet for double floors 12b is opaque, it has a plurality of through holes H penetrating in the thickness direction, so that the boundaries between adjacent floor underlay materials 10 can be visually recognized, and therefore the arrangement of the floor underlay materials 10 on the lower side can be understood from the upper side of the unevenness adjustment sheet for double floors 12b. Note that the adhesives 11 and 13 are applied thinly and uniformly using, for example, a sponge roll, and many of them become transparent when dry, so they do not prevent the visibility of the boundaries between the floor underlay materials 10. This allows the selection of the floor underlay materials 10 that need to be removed from the upper side of the unevenness adjustment sheet for double floors 12b on the lower side, and therefore it is possible to provide the unevenness adjustment sheet for double floors 12b for double floors and a double floor structure equipped with the sheet, which allows the floor underlay materials 10 to be efficiently removed.

[0059] Furthermore, according to this embodiment of the unevenness adjustment sheet 12b for double floors and the double floor structure equipped with it, the adhesives 11 and 13 are provided transparent or translucent, so that the boundary between adjacent floor underlayment materials 10 arranged from the upper side of the unevenness adjustment sheet 12b for double floors to the lower side can be easily visually confirmed.

[0060] In addition, according to the double floor unevenness adjustment sheet 12b of this embodiment and the double floor structure equipped with it, a removable and re-adhesive adhesive 11 is provided between the multiple floor underlayment materials 10 and the double floor unevenness adjustment sheet 12b, so that the double floor unevenness adjustment sheet 12b can be easily laid on top of the multiple floor underlayment materials 10 laid on the floor slab F.

[0061] In addition, according to the double floor unevenness adjustment sheet 12b of this embodiment and the double floor structure equipped with it, each floor underlayment is provided with an openable and closable lid material C in a color different from the floor underlayment 10. Therefore, by providing a lid material C in a conspicuous color such as red or blue for a floor underlayment 10 in a less conspicuous color such as gray, not only can the boundary between adjacent floor underlayment materials 10 arranged from the upper side to the lower side of the double floor unevenness adjustment sheet 12b be visually confirmed, but the lid material C provided on the floor underlayment 10 can be easily visually confirmed.

[0062] In addition, according to the double floor unevenness adjustment sheet 12b of this embodiment and the double floor structure provided with it, since the end faces of each floor finishing material 14 are not subjected to the actual processing, there is concern about unevenness between adjacent floor finishing materials 14, deformation of the floor base material 10 itself, and unevenness caused by the adhesion of the existing adhesive 11, but the unevenness and unevenness can be eliminated or alleviated by the double floor unevenness adjustment sheet 12b provided on the underside of each floor finishing material 14 via a removable and re-adhesive adhesive 13. In addition, since the end faces of each floor finishing material 14 are not subjected to the actual processing, partial replacement of the floor finishing material 14 can be easily performed.

[0063] Furthermore, according to the double floor unevenness adjustment sheet 12b of this embodiment and the double floor structure equipped with it, multiple floor underlayment materials 10 are arranged in a matrix pattern, so that the boundaries between adjacent floor underlayment materials 10 extend in straight lines. Therefore, for example, when redoing underfloor wiring during renovation, the target floor underlayment material 10 can be easily removed.

[0064] Other Embodiments In each of the above embodiments, a double floor structure having a floor finishing material whose end surfaces are not subjected to this processing has been exemplified, but the present invention can also be applied to a double floor structure having a floor finishing material whose end surfaces are subjected to this processing. [Industrial Applicability]

[0065] INDUSTRIAL APPLICABILITY As described above, the present invention is extremely useful because it can provide an unevenness adjustment sheet for double floors that allows the floor underlayment to be efficiently removed, and a double floor structure equipped with the same. [Explanation of symbols]

[0066] C Lid material F Floor slab H through hole S space 10. Floor Underlayment 11,13 Adhesive 12a, 12b Unevenness adjustment sheet for double floor 14 Floor finishing materials 20 Double floor structure

Claims

1. A plurality of floor underlays are provided on one surface side of the floor slab with a space between the floor slab and the underlayment, A flatness adjusting sheet in which a plurality of floor finishing materials are laid on the other surface side via a removable and re-adhesive adhesive, An unevenness adjustment sheet for double floors, characterized in that the boundary between adjacent floor underlayment materials is arranged so that it can be seen from the surface side of the other of the above.

2. The unevenness adjusting sheet for double floors according to claim 1, An unevenness adjustment sheet for double floors, characterized in that it is transparent or translucent.

3. The unevenness adjusting sheet for double floors according to claim 1, An unevenness adjustment sheet for double floors, characterized in that it is opaque and has a plurality of through holes that penetrate in the thickness direction.

4. A double floor unevenness adjustment sheet according to any one of claims 1 to 3, A plurality of floor underlay materials are provided on one surface side of the above-mentioned double floor unevenness adjustment sheet and laid on the floor slab with a space between the floor slab and the floor underlay materials; A double floor structure characterized by comprising a plurality of floor finishing materials laid on the other surface side of the above-mentioned double floor unevenness adjustment sheet via a removable and re-adhesive adhesive.

5. In the double floor structure described in claim 4, A double floor structure characterized in that the adhesive is transparent or translucent.

6. In the double floor structure described in claim 4, A double floor structure characterized in that a removable and re-adhesive adhesive is provided between the multiple floor underlayment materials and the double floor unevenness adjustment sheet.

7. In the double floor structure described in claim 4, A double floor structure characterized in that each of the above-mentioned underfloor materials is provided with an openable and closable lid material of a different color from each of the underfloor materials.

8. In the double floor structure described in claim 4, A double floor structure characterized in that no actual processing is applied to the end faces of each of the above floor finishing materials.

9. In the double floor structure described in claim 4, A double floor structure characterized in that the multiple floor underlayment materials are arranged in a matrix pattern.

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