JP3400688B2 - Dry double floor structure and method of changing floor plan - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry double-floor structure and a method for changing the floor plan, in which the floor plan can be changed much more easily than conventional ones.

[0002]

2. Description of the Related Art In recent years, particularly in an apartment house, a structure having a double floor has been widely adopted in order to improve sound insulation properties, shock absorbing properties when falling, walking properties, habitability and the like. . Conventionally, the wall-preceding construction method was used in which a wall foundation was constructed in advance and a double floor was used for each room, but recently, due to advantages such as labor saving in construction and shortening the construction period, a double floor has been constructed. The floor-preceding construction method, in which the wall foundation is provided after the construction has been done in advance, has been receiving attention.

As shown in FIG. 16, the dry double floor construction method is a legged panel system using a legged panel unit 50 having support legs 51, 51 ... at four corners of one independent floor panel. , As shown in FIG. 17, at the intersections of the four corners of the floor panels 55, 55 ...
Support legs 54 that commonly support adjacent floor panels 55,
The common support leg system in which 54 ... Is provided and supported, and as shown in FIG. 18, the support legs 57, 57 ... Are provided only on the side edge of the floor panel 56 and the side edge on the side where the support leg is disposed. The floor panel is provided with a stepped frame plate 58 on one side, and it is roughly classified into a one-sided mounting system in which the other side edge of the floor panel 56 is sequentially supported by the frame plate 58 of the adjacent floor panel 56 (FIGS. 16 and 16). 1
8 is an extract from the Fukubi Chemical Industry Co., Ltd. catalog). In the case of the above-mentioned panel system with legs, the throwing-out 52 is indispensable in order to integrate the floor panel, and depending on the type of floor finishing material, the throwing-out is not necessary in the common support leg system and the one-sided mounting system. It

On the other hand, in recent years, due to the diversification and change of lifestyles and the tendency toward permanent residence, there has been a demand for a living structure in which it is possible to easily change the pattern from a tatami mat to a flooring, etc. or change the layout after living. Due to the tendency of aging, barrier-free that does not have steps between rooms has been introduced. As a method for dealing with barrier-free in the floor preceding method, all tatami mats,
Flooring materials such as flooring and carpet should have the same thickness, and all double floors should be at the same level. Although there is a method to make the finishing level the same, the former method of making all the finishing materials have the same thickness surely makes it possible to easily realize barrier-free, and it is possible to change the pattern and layout in the future. Although it can be easily dealt with, it cannot be adopted as a realistic measure from the viewpoint of function and cost, and in reality, the latter method of "barrier-free with double floor steps" is adopted. There is. However, in this case, a large-scale renovation work is required to change the design and layout.

[0005]

Specifically, in the case of the panel panel with legs, since each floor panel is independent, it is basically possible to change the height for each floor panel. In order to remove the tension, the height of the supporting leg of the target floor panel must be adjusted after removing or moving each floor panel that has been set, or the supporting leg located directly below the wall. Must be replaced with a support leg for directly under the wall (a leg with small vertical elastic deformation), and the steps for resetting the floor panel must be taken again.

Also in the case of the common support leg system, similarly, each floor panel that has been set is once removed or moved, the height of each support leg is adjusted, and the support leg under the wall is supported directly under the wall. You have to replace it with a leg and take steps to reset the floor panel. Moreover, in the case of this method, the pedestal of the supporting leg and the floor panel are often firmly adhered by an adhesive material, and it is not easy to remove or move the floor panel, and the supporting leg is made of metal bolts. Since it is often hardened with an adhesive to prevent loosening after adjusting the level, there is also a problem that in reality all supporting legs at the changed location have to be replaced.

Further, in the case of the one-sided mounting method, since the support on one side of the panel is supported by the frame plate of the adjacent floor panel, it is necessary to remove the floor panel while temporarily receiving it temporarily. It is a labor-intensive construction. In the case of renovation, it would be more efficient and lower cost to destroy the whole structure and reconstruct the double floor.

In any case, in these conventional floor panel systems, it takes a lot of time and effort to carry out a pattern change and a floor plan change, resulting in an extremely high cost. In addition, the structure for accommodating steps at the time of changing the floor plan is not standardized or patterned, and the actual situation is that each construction site is constructed with unique ideas.

[0009] Therefore, the main object of the present invention is to provide a dry double floor structure in which it is possible to easily and in a short period of time change the floor pattern and layout after living on the premise that barrier-free construction will be performed. It is to provide a floor plan changing method capable of realizing patterning and standardization and facilitating construction.

[0010]

In order to solve the above problems, the invention according to claim 1 is such that at least four corners of a rectangular floor panel are provided with height-adjustable support legs, and each side of the floor panel is provided. A legged panel unit provided with a stepped seating surface that is lower than the floor panel upper surface by the thickness of the floor panel is used, and the legged panel unit is provided between each leg unit adjacent to each other in the plane XY direction. Install in a grid arrangement while leaving a groove-shaped space, lay a groove lid floor panel with the stepped seating surface as a mounting surface in the groove-shaped space , and install it directly above the supporting legs of the panel unit with legs.
Or the position near it or the middle position of the support leg
And partition walls or sills with step packing
It is provided with and it straddles the said partition or threshold
A dry double floor structure is provided , characterized in that each room has a step at the level of the double floor .

According to a second aspect of the present invention, the gutter lid floor panel is firmly fixed to the stepped seating surface by a reversible connecting means such as a screw. Structure is provided.

According to a third aspect of the present invention , the support leg has a through hole formed at the position where the support leg is provided, penetrating the floor panel in the vertical direction, and is fixedly provided on the back surface side of the through hole. 3. The dry double floor structure according to claim 1, wherein the structure is composed of a leg-supporting nut member and a leg bolt that is screwed onto the leg-supporting nut member and is detachable from the upper surface side. To be done.

According to a fourth aspect of the present invention, a through hole for the leg bolt, or a leg supporting nut member together with the through hole is provided in advance in an intermediate portion and / or a side intermediate portion of the floor panel. A dry double floor structure according to claims 1 to 3 is provided.

According to a fifth aspect of the present invention , a height-adjustable support leg is provided at at least four corners of the floor panel having a flat square shape, and each side of the floor panel has a thickness equal to the thickness of the floor panel from the upper surface level of the floor panel. Using a panel unit with legs provided with a stepped seating surface, the panel units with legs are adjacent in the plane XY direction by an arrangement dimension of 1.3 to 2 x dimension L between supporting legs. Installed in a grid arrangement while leaving a groove-shaped space between and, laying a groove lid floor panel with the stepped seating surface formed on the side edge of the floor panel in the groove-shaped space as a mounting surface, and A partition wall or a sill is provided with a step packing interposed between a position immediately above or near the supporting leg of the panel unit with legs or an intermediate position of the supporting leg, and the partition or A dry double floor structure in each room straddling the residence is provided a step on the level of the raised floor, hits the floor plan changes, the new / movement of such partitions or threshold,
In the plane XY direction, it is decided to perform it in a module unit of 0.3 to 1 × the dimension L between the supporting legs. Basically, only the predetermined grooved floor panel is removed while the floor panel unit with legs is orientated, and the height is increased. If the support leg needs to be changed or adjusted, and if the partition or sill is placed in the middle of the floor panel, add the support leg to the middle part of the floor panel and / or the middle part of the side edge. After that, a new layout / movement such as a partition or a sill is performed, and the floor plan changing work is completed by returning the groove panel floor panel that was finally removed to the original state and completing the floor plan changing work .

According to a sixth aspect of the present invention, the interior of the dwelling unit is divided into an area where the floor plan is to be changed in the future and an area where the floor plan is to be changed, and the layout pattern of the floor panels with legs is 1.3 to 2.
× Arbitrarily plurally set within the range of the support leg dimension L, the layout pattern on the relatively small dimension side is assigned to the planned layout change area, and the layout pattern on the relatively large dimension side is the layout change undetermined area A floor plan changing method according to claim 5, wherein the floor plan changing method is provided.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view of a dry type double floor structure according to the present invention, and FIG. 2 is a view taken along the line II--II of FIG.

This dry type double floor structure is provided with supporting legs 4, 4, ... at four corners of a square floor panel 2 in plan view, and each side of the floor panel 2 is higher than the plane level of the floor panel 2. As a basic panel, the legged panel unit 1 having the stepped seating surface 2a that is lowered by the thickness of the floor panel 2 is used as a basic panel.
This is installed in a grid arrangement while leaving a groove-shaped space 7 between each of the panel units with legs 1 adjacent to each other in the plane XY directions, and the stepped seating surfaces 2a, 2a are installed in the groove-shaped space 7 part.
The groove cover floor panels 5 and 6 are laid as the mounting surface.

More specifically, the legged panel unit 1 is, as shown in FIG. 2, provided at four corners of a floor panel 2 such as a particle board, preferably a height made of a material such as synthetic resin. Adjustable support legs 4, 4, ... Are provided, and a frame plate 3 is interposed between the floor panel 2 and the support legs 4, 4 with respect to the periphery of the floor panel 2, and a groove lid floor panel 5 is provided at a side edge portion. 5, stepped seating surfaces 2a, 2 serving as lateral seating surfaces
a is formed, and in the present example, the support legs 4 and 4 are formed.
The center-to-center distance L is 600 mm. The supporting leg distance L is set in consideration of trends such as ISO, and is 303/606 / which is currently used in building materials.
When setting 910mm ... as a module unit,
According to this unit system, it becomes 606 mm. However, it is not limited to these numerical values.

As a method of forming the stepped seating surface 2a,
In addition to the method using the frame plate 3, for example, as shown in FIG. 3, one floor panel 2A to which support legs 4, 4, ... Are fixed.
A waste floor panel 2B having a size slightly smaller than the floor panel 2A is further stacked and fixed thereon, and the stepped seating surface 2 is provided on the side edge portion.
It is also possible to form a.

As the type of the supporting leg 4, there are a metal type and a synthetic resin type at present, and the metal type is made of metal by an adhesive after adjustment in order to prevent loosening with time. I try to harden it. Therefore, the height cannot be adjusted when the floor plan is changed in the future, and the support leg 4 must be replaced. On the other hand, it has been confirmed that the synthetic resin has little looseness due to the elasticity of the resin, and since it can easily correspond to the future height adjustment, the synthetic resin is preferably used in accordance with the gist of the present invention. Used.

The support leg 4 is composed of a support leg nut 4a and a support leg bolt 4b, and the support leg bolt is passed through a through hole 2b formed through the floor panel 2 in the vertical direction at the position where the support leg 4 is disposed. 4b can be extracted / inserted,
Furthermore, the height can be adjusted from the floor. As such a support leg 4, for example, a double floor bolt manufactured by Fukubi Chemical Industry Co., Ltd. is available. Therefore, as shown in FIG. 4, through holes 2c, 2d, ... Are formed at the center and / or the center of the side of the floor panel 2, respectively, and the supporting leg nuts are formed on the back side thereof in preparation for future floor plan changes. If 4a is fixed, as shown in FIG. 5, the support leg 11 can be added very easily.

Even if the partition or sill after the floor plan is changed is arranged in the center of the floor panel 2, if the structural support conditions permit, that is, the distance between the supporting legs supporting the partition becomes large. If it is confirmed that there is no structural problem, the support leg nut 4a may be attached together with the through hole 2c only at the center or the side center of the floor panel 2. Further, in order to reduce the material cost, a support leg nut 4a is attached together with a through hole 2c in the center of the floor panel 2 where it is difficult to add support legs, and a through hole is provided in the center of the side where relatively more support legs can be added. It is also possible to form only 2d, 2d ...

As shown in FIG. 1, the legged panel unit 1 is adjacent to each other in the X direction and the Y direction, for example, with a layout dimension of 1.5 × center dimension between support legs in the XY direction in the plane. It is installed in a grid arrangement while leaving a groove-shaped space 7 between the panel unit with legs 1, 1, .... That is, in the grid (called tartan grid) in which the dimensions of 600 mm and 300 mm with the supporting legs 4, 4 ... Are arranged so that the supporting legs 4, 4 are aligned with each other at the intersection of the grid of 600 mm square, and a groove-like space 7, 7 having a width of 300 mm is formed between adjacent panel units with legs at a distance between the supporting legs. And the stepped seating surface 2a formed on the side edge of the floor panel 2,
The groove lid floor panels 5 and 6 are laid on the mounting surfaces 2a.

The groove cover floor panels 5 and 6 are connected to the stepped seating surfaces 2a, 2a ...
By firmly fixing with 10 ..., The legged panel units 1, 1, ... Can be integrated with each other, and the throwing tension which has been indispensable in the conventional legged panel can be eliminated. Further, as the laying pattern of the groove cover floor panel, for example, as shown in FIGS.
As shown in FIG. 7, the laying pattern of the side groove cover floor panels 5, 5 for the grid and the intersection groove cover floor panel 6 arranged at the intersections of the legged panel units 2, 2 ,. The laying pattern may be a combination of the side groove cover floor panel 8 for 3 grids and the side groove cover floor panel 9 for 2 grids. Particularly, in the case of the laying pattern of FIG. 6, if only the side groove cover floor panels 5, 5, ... Are fixed to the legged panel units 1, 1 ,.
Since the whole can be integrated, the intersection groove floor panel 6 need only be fixed with a simple tape or the like. Therefore, for simplicity, the intersection groove floor panels 6, 6 ...
If you remove only the support leg 4 at the back of the four corners of the intersection,
It becomes possible to adjust the height of 4 ... and to easily inspect the double floor and the underfloor piping and take out the wiring from the underfloor space.

Next, a detailed description will be given of the structure for accommodating the step portion when a partition or a sill is newly installed or changed in the above-mentioned dry double floor structure.

In the dry type double floor structure, the supporting legs 4, 4, ... Are aligned with the intersection of the tartan grid, and the legs can be easily added to the center and / or the center of the side of the floor panel 2. Therefore, a new partition or sill can be newly installed or moved by setting a dimension of 0.5 × dimension L between supporting legs, that is, a 300 mm square grid as a basic module (basic unit). The module grid for partitioning is shown in FIG. 1 by a chain line S.

In this double-floor structure, the step construction structure (barrier-free storage structure) is completely patterned, so even if a new partition or sill is installed or moved, it will be stored after construction. Since the structures are the same, the step-accommodating structure will be described for each pattern in order.

Since the basic module is set in the unit of the 300 mm grid as described above, when a step difference occurs at the end of the legged panel unit 1 (first case).
The following are three steps of the stepped structure including the stepped structure when the stepped portion is lowered at the end of the legged panel unit 1 (second case) and the stepped portion is formed at the center of the legged panel unit 1 (third case). You just have to make a suggestion.

First, as shown in FIG. 8, when a partition 12 is arranged at the end of the legged panel unit 1 and a step rises to the right, a step is formed at the partition boundary as shown in FIG. The first step packing 13a is installed on the seating surface 2a, and the second step packing 13b straddles the step packing 13a and the side end of the floor panel 2.
The third step packing 13c is arranged on the floor panel 2 side of the second step packing 13b, and the partition 12 is arranged with the third step packing 13c as a base. On the rising step side, the groove lid floor panel 5 is installed with the stepped portion on the side of the third step packing 13c as a seating surface.

Further, as shown in FIG. 10, when the partition 12 is arranged at the end of the legged panel unit 1 and a downward step is formed on the right side, as shown in FIG. The one panel unit with leg 1'is arranged according to the level on the step side, and the first step packing 13a is installed on the left stepped seating surface 2a of the leg panel unit 1 '. While installing the second step packing 13b across the step packing 13a and the side end of the floor panel 2, the third step packing 13c is provided on the side end of the floor panel 2 on the right side of the legged panel unit 1 '. Is installed, the plate-like floor panel 14 is laid across the second step packing 13b and the third step packing 13c, and the partition 12 is provided directly above the third step packing 13c. It is said to have structure.

Further, as shown in FIG. 12, when the partition 12 is arranged in the center of the legged panel unit 1 and a step is formed which descends to the right, as shown in FIG.
At the boundary of the partition, first, the support leg 11 is added to the center of the floor panel 2, and then the third step packing 13c is installed on the extension support leg 11, while the right stepped seat of the panel unit 1 with legs is installed. First step packing 13a on the surface 2a
And a second step packing 13b is installed across the step packing 13a and the side end of the floor panel 2, and an additional floor panel is installed across the second step packing 13b and the third step packing 13c. 14 is provided horizontally, and the partition 12 is provided directly above the third step packing 13c.

As can be seen from the above, the structure for accommodating the steps in the three cases, exceptionally, in the first case, the plate-like floor panel 14 is used.
However, the first step packing 13a, the second step packing 13b, and the third step packing 13c are commonly used in all cases, and no other extra parts are required. The structure is very simple and standardized. Further, since the frame plate 3 is provided on the side portion of the floor panel 2 and the stepped seating surface 2a is formed, it is very easy to dispose the partition 12 directly above the support leg 4. There is. In other words, the structure in which the stepped seating surface 2a is formed around the floor panel 2 has an advantage that the height of the general portion of the double floor can be easily changed.
Further, even in the step boundary portion, it is easy to arrange the partition 12 immediately above the support leg, and further, it is possible to facilitate the step construction in each pattern with the defined parts.

Although the standard floor plan changing pattern and the step portion accommodating structure have been described above, various changes can be made within the scope of the same spirit of the present invention. For example, in this example, the basic module is 300 for the floor plan change pattern.
Although the position of the partition 12 is limited to 2 positions directly above the support legs of the floor panel 2 and a total of 3 positions in the center, the partition 12 may be positioned at a position slightly deviated from just above the support legs 4. Alternatively, the partition 12 is not limited to the center of the floor panel 2, and the partition 12 may be positioned at any intermediate position. Further, the arrangement dimension of the panel units with legs 1, 1 ... Is preferably set to 1.5 × the dimension L between the supporting legs so that the groove interval (groove portion supporting leg interval) is the basic module (300 mm). It can be arbitrarily set within a range of approximately 1.3 to 2 × dimension L between supporting legs.

When the arrangement interval of the panel unit with legs is, for example, 2 × the dimension L between the supporting legs, the groove spacing (groove portion supporting leg spacing) becomes the same as the dimension L between the supporting legs. In addition to the pattern, as shown in FIG. 14, a pattern in which the partition 12 is arranged in the center of the groove lid floor panels 5 and 6 is added. In this case, as shown in FIG. 15, the support leg 11 is first added to the center of the groove lid floor panel 5 at the partition boundary, and then the third step packing 13c is installed on the extension support leg 11. On the other hand, the fourth step packing 13d is provided at the inner end of the legged panel unit 1 installed on the high area side, and the first step packing 13a and the second step packing 13b are provided at the outer end thereof.
Are installed respectively, the additional floor panel 15 is laid across the third step packing and the fourth step packing, and the additional floor panel 16 is installed across the fourth step packing 13d and the second step packing 13b. May be installed horizontally to construct a high-stage floor, and the partition 12 may be provided directly above the third step packing 13c.

By the way, in the double floor structure according to the present invention, it is not necessary that one pattern is commonly applied to the entire area of the room. That is, as a result of setting the dimension L between the supporting legs to 1.5 in the general part of the house, 1.3 to 1.9x in the end part of the house.
It may be the dimension L between the supporting legs, or the interior of the dwelling unit is positively divided into a future plan change area and a floor plan change undetermined area, and in the floor plan change area, the legged panel unit 1, The arrangement interval pattern of 1 ... May be set in the arrangement pattern of, for example, 1.5 × the dimension L between the supporting legs, and may be set in the arrangement pattern of, for example, 2 × the dimension L between the supporting legs in the layout change undetermined region. . Further, the planned floor plan change area may be constructed by a double floor structure according to the present invention, and the other floor plan change undetermined areas may be constructed by a conventional single-sided mounting method.

[0037]

As described above in detail, according to the present invention, the floor can be redesigned or the floor plan can be easily changed after living in a short period of time. In addition, since the structure for accommodating steps when changing the floor plan is clearly patterned and no special parts are newly required, the workability is improved and the cost is very low.

[Brief description of drawings]

FIG. 1 is a plan view of a dry double floor according to the present invention.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a side view showing another example of the panel unit with legs 1.

FIG. 4 is a plan view showing another example of the panel unit with legs 1.

FIG. 5 is a diagram showing how to add support legs.

FIG. 6 is a laying pattern diagram of the groove lid floor panel.

FIG. 7 is a laying pattern diagram of another grooved floor panel.

FIG. 8 is a plan view of a step pattern (1).

FIG. 9 is a structural diagram of a step pattern (part 1) in which a step portion is housed.

FIG. 10 is a plan view of a step pattern (2).

FIG. 11 is a structural drawing of a step pattern (part 2) in which a step portion is housed.

FIG. 12 is a plan view of a step pattern (3).

FIG. 13 is a diagram showing a structure in which a step portion of a step pattern (No. 3) is accommodated.

FIG. 14 is a plan view of a step pattern (4).

FIG. 15 is a structural diagram of a step pattern (part 4) in which a step portion is housed.

FIG. 16 is a structural perspective view of a conventional dry type double floor by a panel system with legs.

FIG. 17 is a perspective view showing the structure of a conventional dry double floor system using a common supporting leg system.

FIG. 18 is a perspective view showing a structure of a conventional dry double floor by a single-sided mounting method.

[Explanation of symbols]

1 ... Panel unit with legs, 2 ... Floor panel, 3 ... Frame plate, 4
... Support legs, 5/8/9 ... Side groove lid floor panel, 6 ... Intersection groove lid floor panel, 7 ... Groove-like space, 11 ... Additional support legs, 12
... Partitions, 13a to 13d ... First to fourth step packings, 14 to 16 ... Additional floor panel

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04F 15/024 606 E04F 15/00 101

Claims (6)

(57) [Claims] 1. At least four corners of a rectangular floor panel are provided with height-adjustable support legs, and each side of the floor panel is provided with a stepped seating surface that is lower than the upper level of the floor panel by the thickness of the floor panel. Using the provided panel unit with legs,
This legged panel unit is installed in a grid arrangement while leaving a groove-shaped space between each of the legged panel units adjacent to each other in the plane XY direction, and a stepped seating surface is attached to the grooved space portion. laying groove cover floor panels as and before
Position directly above or near the support leg of the panel unit with legs
Alternatively, use the middle position of the support legs as
With a partition wall or a threshold
In each room that spans the partition or threshold,
A dry double-floor structure characterized by a step at the level of the heavy floor. 2. The dry double floor structure according to claim 1, wherein the groove lid floor panel is firmly fixed to the stepped seating surface by a reversible connecting means such as a screw. 3. The support leg has a through hole formed vertically through the floor panel at a position where the support leg is disposed, and a leg supporting nut member fixedly provided on the back side of the through hole. ,
The dry double floor structure according to claim 1 or 2, which is a structure including a leg bolt that is screwed to the leg supporting nut member and is detachable from the upper surface side. 4. A through hole for the leg bolt or a leg supporting nut member together with the through hole is provided in advance in an intermediate portion and / or an intermediate portion of a side edge of the floor panel. Dry type double floor structure. 5. A stepped seat having height-adjustable support legs at least at four corners of a floor panel having a flat square shape, and lowering on each side of the floor panel by the thickness of the floor panel from the upper surface level of the floor panel. A panel unit with legs provided with a surface is used, and the panel unit with legs is provided with 1.3 in the plane XY direction.
According to the layout dimension of 2 to L between the supporting legs, it is installed in a grid arrangement while leaving a groove-shaped space between adjacent panel units with legs, and is formed on the side edge of the floor panel in the groove-shaped space portion. A grooved lid floor panel is laid using the stepped seating surface as a mounting surface, and a partition wall is provided with a step packing as an intervening boundary at a position directly above or near the supporting leg of the legged panel unit or an intermediate position of the supporting leg. Alternatively, a sill is provided and a dry double-floor structure is provided in which the level of the double floor is provided in each room that straddles the partition or the sill. Direction is 0.3 to 1 x the dimension L between the supporting legs, and it is decided to perform it by the module unit. Basically, only the predetermined grooved floor panel is removed while the floor panel unit with legs is orientated. Replacing or adjusting the supporting legs that need to be changed in height, and if the partition or sill is installed in the middle of the floor panel, add more supporting legs in the middle part and / or middle part of the side panel of the floor panel. After this, a floor plan change method is characterized in that a partition or a sill is newly installed / moved, and the floor cover floor panel that was finally removed is returned to the original state to complete the floor plan change work. 6. A dwelling unit is divided into a future plan change area and a floor plan change undetermined area, and a layout pattern of the floor panels with legs is arbitrarily set within a range of 1.3 to 2 × support leg dimension L. 6. The floor plan changing method according to claim 5 , wherein a plurality of relatively small size layout patterns are assigned to the planned floor plan change area, and a relatively large layout pattern is assigned to the floor plan change undetermined area. .