JPH10331399A - Dry placed floor construction method and double floor structure formed thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry placed floor construction method in which a floor panel can be extremely easily laid with good working property and stability to significantly shorten the term of works, and a double floor structure formed thereby. SOLUTION: A joist unit 18 is provided along a prescribed height of a room wall 8, and one edge of a floor panel 7a is supported thereon. The other edge part of the floor panel 7a not contact with the joist unit 18 is placed in cantilever state on a unit support leg 10 arranged on a foundation floor 4 at a prescribed pitch, and mounted thereon through an adhesive sheet adhered to the upper surface of the receiving plate 13 of the unit support leg 10. The insert hole of the receiving plate of the unit support leg 10 is laid in the state exposed from the edge part of the floor panel 7a. The adjacent floor panel 7a is similarly placed on the set unit support leg 10 with a prescribed space allowing the level adjustment of the floor panel 7a, and the other unit support leg 10 is arranged to mount it in the same manner. The level of the floor panel 7a is regulated by fitting the top end of a driver or the like to a groove formed on the upper end surface of a support bolt 11a through the insert hole, and rotating the support bolt 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry flooring method for forming a double floor by forming a space between existing foundation floors in various buildings such as apartment houses, and a double floor formed by the method. Regarding the structure.

[0002]

2. Description of the Related Art A conventional floor placing method is to place a floor panel material fixed on a floor support member without gaps on a foundation floor surface.
Alternatively, a discarded plywood is placed on top of this, and it is necessary to cut and process floor panel materials depending on the design of the room. However, on the other hand, dry dwelling methods with less processing of floor panel materials have been increasing to improve livability such as countermeasures against floor impact noise in apartment houses.

In the conventional dry flooring method, as shown in FIG. 12, a floor unit 3 having four or six supporting legs 2 attached to four corners and a center of a square (or rectangular) fixed-sized floor panel 1 is provided. As shown in FIG. 13, the floor unit 3 is placed on a base floor (concrete slab) 4 and a discarded plywood 5 is laid thereon. Reference numeral 8 indicates a wall (or partition). In another construction method, as shown in FIG. 14, a floor knit 3a in which two floor panels 1 are joined together and a support leg 2 is attached only to the side where the floor panels are not overlapped is used, and the floor units 3a are placed next to each other. At the time of joining, a side of one floor unit to which the support legs are not attached is also mounted on a support leg attachment portion of the other floor unit. Also in this case, a discarded plywood is laid on it.

[0004] The floor panels of these floor units are prepared in several dimensional standards, and when they are constructed, they are combined in accordance with the room at the site, or they are constructed with a floor unit of one kind, and the size is reduced. Floor panels that do not fit were processed and constructed on site. In the above construction method, the floor unit 3 (3a) close to the wall or the partition 8 is the one shown in FIG.
As shown in FIG. 3, since the side surface of the floor unit 3 (3a) is arranged at an appropriate distance d from the wall or the partition 8, the portion of the floor panel 1 projecting from the support leg 2 and the floor panel 3 (3a) The portion of the discarded plywood 5 further protruding therefrom has a structurally weak strength. When heavy furniture is placed on the floor laid in this way, particularly near the wall or the partition 8, there is a problem that the floor in that part sinks.

As a countermeasure against this, as shown in FIG. 15, a joist 9 is fixed from the side by using a nail 17 or the like at a position of a floor height necessary for a wall or a partition 8, and a bundle for supporting the joist 9 is used. A method has been proposed in which 16 is inserted and fixed between the foundation floor (concrete slab) 4 and the joist 9 at an appropriate interval. When installed in this manner, the floor panel 7 is placed on the joist 9 slightly away from the wall or partition 8 and fixed with nails 17, and the other floor panel (not shown) is supported by a floor unit or the like. Become like Pile plywood on the floor panels. According to the joist construction in such a dry flooring method, the strength of the floor at the time of the wall or the partition increases, and the problem that the floor sinks even when heavy furniture or the like is placed hardly occurs. Further, the number of support legs required for the floor unit is reduced, and the cost is also reduced.

[0006]

The floor panel used in the above-mentioned conventional method is almost square and has an area of 1 m.
² or less. These are, for example, 900 mm to 910 m
A plywood or particle board having a fixed size of mx 1800 mm to 1820 mm is cut into the above shape. In a floor unit composed of floor panels of this size, the area laid at one time is almost 1 m ² or less, and a large number of floor units must be used when placing the floor in a large room. If the floor unit is laid out and the floor unit does not fit in the corner of the room, etc., use a partly cut floor panel.In this case, there is a part without support legs and it becomes unstable. It is inevitable to become. Further, the workability is inferior, and the construction period is prolonged.

[0007] In addition, in the above-mentioned dry flooring method, when a joist is to be constructed at the time of a wall or a partition, and when the wall or the partition is made of a hard material such as concrete, it is not always easy to attach the joist. Can not.
In particular, adjusting the height is extremely time-consuming, and all joist and bundle processing must be done on site, which increases the construction period and increases costs due to rising labor costs. Came to be. Also, with respect to the floor impact noise that is currently a problem, vibration is transmitted through it to fix the floor panel to the wall through the joist, and the floor impact sound is transmitted downstairs Problems also arise.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to use a fixed-sized floor panel and unit support legs to make the floor panel extremely simple and workable. An object of the present invention is to provide a dry flooring method that can be laid with good flexibility and can greatly shorten the construction period.
It is another object of the present invention to provide a dry flooring method and a double floor structure formed by the method, which can reduce the number of times of processing the floor panel to improve the efficiency of the construction and reduce the construction cost. Another object of the present invention is to improve the workability and the construction cost by eliminating the on-site processing of joists and bundles at the time of construction of the joist, facilitating the work of adjusting the floor height, simplifying, etc. Another object of the present invention is to provide a dry floor laying method capable of securing floor strength at the time of wall or partition and reducing floor impact noise, and a double floor structure formed by this floor laying method.

[0009]

According to the present invention, there is provided, in accordance with the present invention, a unit support leg comprising a rod-like leg and a receiving plate mounted on the upper end of the rod-like leg so as to be vertically adjustable. A dry flooring method in which a group and a floor panel group are combined, wherein a joist unit having supporting legs capable of being vertically adjusted at least at two places of a joist or a horizontal joist adjusted to a predetermined height level is a wall or a partition. Along with installing along the floor, a plurality of unit support legs are arranged on the floor surface of the foundation floor at a predetermined pitch according to the shape of the floor panel, and for the floor panel facing the wall or partition, One side faces the wall or the partition so that the edge of the wall or the partition side is supported by the joist or the joist unit, and the edge of the other side is supported by the unit supporting leg. The floor panels are arranged with predetermined gaps such that the upper end surfaces of the rod-shaped legs are exposed such that predetermined edges of the floor panels are supported by the unit support legs. And a floor panel is laid in a state where the floor panel is supported at a level. Adjustment of the floor level of the laid floor panel is preferably performed by using, as the unit support leg, a receiving plate having a screw hole in a substantially central portion and an adhesive sheet adhered to the upper surface, And a rod-shaped leg which is screwed into the screw hole of the receiving plate and has a groove on the upper end surface and a pedestal on which the lower end of the support bolt is rotatably implanted. After laying the floor panel using the unit supporting leg, the tip of the rotating tool is fitted into the groove on the upper surface of the supporting bolt through the gap between the adjacent floor panels, and the height of the receiving plate of the unit supporting leg is rotated by rotating the supporting bolt. To keep the level of the laid floor panel constant. In one embodiment, the floor panel uses a standard-size rectangular plate without cutting, and if necessary, for example, the length of one-third of the long side is placed on the center line of the short side of the rectangular panel. Two holes (through holes) are made at the same pitch, and a portion having the same pitch interval between this portion and the edge of the panel is used as a mounting portion of the unit support leg. Further, in the above flooring method, in a preferred embodiment of attaching a joist to a wall or a partition, a joist unit having vertically adjustable support legs at least at two locations of a horizontally long joist is used. Arranged so that the joists support the walls of the floor panel or adjacent edges when partitioning.

[0010] By the dry flooring method described above, the double-floor basement is placed at least at two locations of a plurality of edge joists or horizontally long joists installed at a predetermined height level along a wall or partition. A joist unit having supporting legs so as to be vertically adjustable; a rod-shaped leg and a receiving plate mounted on the upper end of the rod-shaped leg so as to be vertically adjustable, and in the form of a floor panel on the floor of a foundation floor. A plurality of unit supporting legs arranged at a predetermined pitch corresponding to the plurality of unit supporting legs; and a plurality of floor panels, and a floor panel facing a wall or a partition has an edge on the wall or the partition side where the edge joist or the joist unit is used. And a predetermined portion of the edge of the other side is supported by the unit support leg, while a predetermined portion of the edge of the floor panel not facing the wall or the partition is supported by the unit support leg. Double flooring structure characterized in that it is supported is constructed by. Preferably, as described later, a cushioning material is interposed between the wall or partition and the horizontal joist of the joist unit.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the dry flooring method according to the present invention, a plurality of unit supporting legs are arranged at a predetermined pitch on the floor surface of a foundation floor according to the shape of the floor panel, and the plurality of floor panels are connected to the edge thereof. In order for the predetermined portion to be supported by the unit support leg, the rod is disposed with a predetermined gap such that the upper end surface of the bar-shaped leg is exposed, and the unit is supported by the unit support leg at a predetermined height level. Floor panels are to be laid. For this reason, floor panels can be laid extremely easily and with good workability, and the construction period can be greatly reduced. In addition, since each floor panel is supported by the unit supporting legs at a plurality of locations on the edge, necessary and sufficient floor strength can be maintained. Furthermore, the floor level of the floor panel can be adjusted by inserting the tip of a rotary tool into the groove of the upper end surface of the support bolt through the gap between the adjacent floor panels and rotating the support bolt even after the floor panel is laid. By adjusting the height of the receiving plate, the height level of the laid floor panel can be constantly adjusted by a very simple operation. When a fixed-size rectangular plate is used, the plate is used as it is without cutting.
Floor panels can be easily processed only by making circular holes. When such a floor panel is used, since the floor panel has twice the area of the conventional floor unit, the floor of the same room can be laid with half the labor. Further, by arranging the unit supporting legs at a short pitch (450 mm to 600 mm), the floor panel can be stably supported. In addition, by using a joist unit that has support legs that can be adjusted up and down at multiple locations in the horizontal joist, the height of the joist can be easily adjusted, and the joist can be easily attached to the wall or partition. Becomes At this time, the transmission of the floor impact sound to the downstairs or the adjacent room can be reduced by interposing the cushioning material between the horizontally long joist of the joist unit and the wall or the partition.

[0012]

Embodiments will be described below with reference to the drawings. FIG. 2 is a plan view of an example of a floor panel used in the floor placing method of the present invention. This floor panel 7 has a vertical length of 900 mm to 910 mm, 1800 mm to 182
Use 0mm fixed-size rectangular plywood or particle board as it is, and place approximately 6
A simple circular hole 6 is punched at a pitch of 00 mm. FIG. 3 shows an example of the unit supporting leg used in the present invention. The lower end of the unit support leg 10 is rotatably implanted in a vibration isolating pedestal 12 made of an elastic material such as rubber (for example, the lower end is inserted into a non-through hole of the vibration isolating pedestal).
Receiving plate 13 having a rod-shaped leg 11 composed of a support bolt 11a, an insertion hole 14 in the center of which a nut (not shown) is fitted, and an adhesive sheet (not shown) adhered to the upper surface.
It is composed of The support bolt 11a of the bar-shaped leg 11 is attached to the threaded portion (nut fitted in the insertion hole 14) of the receiving plate 13.
Are screwed in, and the unit support leg 10 is assembled as shown in FIG. The support bolt 11a
A groove 15 (which may be a plus groove or a polygonal concave portion) is provided on the upper end surface of the rod-shaped leg 15. By rotating the support bolt 11a
Plate 1 in which the screw hole of the insertion hole is screwed to the upper screw portion of
3 moves up and down (since the load of the floor panel placed on the receiving plate is applied and the receiving plate cannot rotate), the floor surface level of the floor panel supported by the receiving plate 13 can be adjusted. FIG. 4 shows an arrangement of the floor panel shown in FIG. The floor panel 7 is disposed with a predetermined gap d corresponding to the diameter of the support bolt 11a, and the edge of the floor panel 7 is supported by the unit support legs 10.

At the site, a joist 9 (or a joist unit as described later) is provided along a predetermined height of the room wall 8 as shown in FIG. 1, and one side of the floor panel 7 is supported thereon. Two unit support legs 10 are attached to the floor panel 7 from the back side in advance in accordance with the two holes 6. The other edge of the floor panel 7 that does not contact the joist is connected to the foundation floor (concrete slab) 4 at a pitch of about 450 mm.
It is mounted on the unit support leg 10 disposed above in a cantilevered manner. The unit support leg 10 and the floor panel 7 are attached via an adhesive sheet or the like adhered to the upper surface of the receiving plate of the unit support leg 10. Receiving plate 1 of unit support leg 10
The third insertion hole 14 is exposed from the edge of the floor panel 7. Similarly, two unit support legs 10 are attached to the adjacent floor panels at the two holes 6, and are mounted on the already installed unit support legs 10 with a predetermined gap allowing the level of the floor panel 7 to be adjusted. Similarly, arrange and attach the other unit support legs. Level of floor panel 7 (backing plate 1
3 is adjusted by inserting the tip of a driver or the like into the groove 15 formed in the upper end surface of the support bolt 11a through the insertion hole 14 and rotating the support bolt 11a by turning the driver or the like. Repeat this work for each floor panel.In narrow places where a fixed-size floor panel does not fit, such as a corner of a room, attach a joist, process the standard-size board, adjust the dimensions, and appropriately attach the unit support legs. Place and spread floor panels throughout. After that, the plywood 5 is laid on the entire floor panel 7.

FIG. 5 is a layout diagram showing the construction of a floor panel 7a that has not been perforated in the floor placing method of the present invention.
FIG. 6 is a perspective view thereof. In the case of the floor placing method shown in FIGS. 5 and 6, a joist 9 (or a joist unit as described later) is attached along a wall or a partition 8, and one side of the floor panel 7a is placed thereon. Thereafter, the floor panel is laid in the same manner as in the embodiment shown in FIGS. 1 and 4 except that only a predetermined portion of the edge of the floor panel 7a is supported by the unit supporting legs.

FIG. 7 shows an example in which the joist construction is adopted in the floor placing method according to the present invention. The joist 9 is fixed to a wall or a partition 8 at a required floor height by a nail 17 or the like. A bundle 16 for supporting the joist 9 is inserted between the concrete slab 4 and the joist 9 at an appropriate interval and fixed, and at this time, a floor panel is provided on the joist 9 with an appropriate gap from a wall or a partition. 7a is placed and fixed, and the unit supporting leg 10 is attached to the other edge of the floor panel in advance, and the floor panel 7a
Is adjusted so that it is horizontal, and then the floor panels 7a are sequentially laid in the same manner, and while adjusting the height, the same applies to the joists when attached to the opposite wall or partition. Place and secure the floor panel. After laying the floor panel in this manner, if necessary, the floor panel 7a
And the receiving plate 13 of the unit supporting leg 10 are fixed with nails or the like,
A discarded plywood 5 is laid so as to cover all the floor panels to form a floor base. It should be noted that depending on the type of floor finishing material (for example, thick carpet) to be stuck on the floor substrate, there is a case where a discarded plywood is not laid.

FIGS. 9 to 11 show examples in which a joist unit having vertically adjustable support legs is used in the floor placing method of the present invention. FIG. 8 shows the structure of one joist unit according to the present invention. The joist unit 18 is a horizontally long joist 1 made of wood or other material.
9, a through hole 23 is formed in at least two places spaced apart from each other, a nut 20 is fitted and fixed to a lower portion of the through hole 23, and a support bolt (support leg) 21 is inserted into the through hole through the nut 20. Screw the upper end. The lower end of the support bolt 21 is rotatably attached to a rubber pedestal 22 having sufficient strength as necessary, or the rubber pedestal is not attached. A minus groove is provided on the upper end surface of the support bolt 21. The top of the joist can be adjusted to the required height by inserting the tip of a rotating tool from the upper part of the through hole 23 and fitting it into the minus groove, and rotating the support bolt 21.

FIG. 9 is a layout view of an embodiment at the site of the floor-mounting method using the joist unit shown in FIG. FIG.
0 is a sectional view in the direction of arrow AA in FIG. 9. FIG.
1 is an overall perspective view of the floor placing method including FIGS. 9 and 10 at the time of completion. In the construction at the site, FIG.
As shown in FIG. 11, the joist unit 18 is slightly separated from the wall or partition 8 and the base floor (concrete slab) 4
After adjusting the height to the set height, the next joist unit 18 is placed at an appropriate distance from the first joist unit, and the same operation is sequentially repeated.
The joist unit 18 is appropriately arranged on a wall or a foundation floor at the time of partitioning, by eliminating the processing on site as much as possible by adjusting the interval and the like of each unit. After that,
In the same step as that after the joist construction (Fig. 7) in the floor placing method,
Fix the floor panel to the joist unit, lay the floor panel sequentially, adjust the height while supporting it with the unit support legs,
After laying all floor panels and making necessary height adjustments,
The flooring is constructed by laying discarded plywood on it so as to be in contact with the wall or partition.

Here, it is possible to use a cushioning material, an adhesive or the like between the joist 19 of the joist unit 18 and the wall or partition 8. As the cushioning material at this time, a foamed resin or a flexible resin coated with an adhesive on both sides, or a double-sided adhesive tape having a buffering property can be used. If the unit 18 is used, labor on site can be extremely reduced. This joist unit can be applied to a conventional dry flooring method in addition to the application to the dry flooring method in which the unit supporting legs and the fixed-size rectangular panel group are combined as described in the present embodiment.

[0019]

Since the present invention is configured as described above, it has the following effects. (1) Floor panels can be laid extremely easily and with good workability, and the construction period can be greatly reduced. Adjustment of the floor surface level of the floor panel involves adjusting the height of the receiving plate of the unit support leg by rotating the support bolt by fitting the tip of a rotary tool into the groove of the upper end surface of the support bolt through the gap between the floor panels. The height level of the laid floor panel can be adjusted to a constant level by a very simple operation.

(2) A large-sized rectangular plate can be used as a floor panel without being cut as it is, and even when it is processed, only two holes need to be formed in the floor panel, thereby reducing material costs and costs. I can measure. In addition, since the floor area of one floor panel is large in construction, floor placement work can be performed with half the labor required in the related art, shortening the construction period and reducing construction costs. (3) By using the joist or joist unit and disposing the unit supporting legs in the gap between the adjacent floor panels, the number of supporting legs can be minimized and the cost can be reduced also in this respect. (4) A relatively short pitch (approximately 4
By supporting with a support block at 50 mm), or by supporting the hole on the center line of the floor panel with a unit support leg, sufficient strength and stability can be provided as compared with the conventional one. (5) Even after the floor panels are entirely laid, the upper end surfaces of the support bolts of the unit support legs are exposed in the gaps between the adjacent floor panels, and the floor surface level can be adjusted. (6) From the above (1) to (5), it is possible to construct a floor which is inexpensive, shortens the construction period, and has excellent strength and stability.

(7) Since the area of one floor panel is large and the number of unit supporting legs per floor panel is large, the stability of the floor panel can be expected to be improved. (8) By using the joist unit, necessary and sufficient strength of the floor at the time of the wall or the partition can be obtained. (9) By using the joist unit having the support legs that can be adjusted up and down, it is possible to simplify the troublesome processing and working time of the joist at the site, improve the workability, shorten the construction period, and reduce the cost. (10) By using a joist unit having a rubber pedestal, or by interposing a cushioning material between the joist of the joist unit and the wall or partition, transmission of floor impact sound by the joist in the conventional wall or partition can be mitigated. (11) The joist unit can be used not only as a corner joist construction method but also as a base material for a partition in a floor-preceding construction method, so that the base material of the partition having sufficient strength can be constructed. (12) In the wall leading method, since the joist unit is not fixed to the wall or the partition with a nail or the like, the floor can be configured as an independent floor and the renovation work such as a change of the partition in the future can be easily performed. Can evolve.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a floor placing method according to the present invention and showing a form of a floor placing at a site.

FIG. 2 is a plan view showing an example of a dimensional standard of a floor panel.

FIG. 3 is a perspective view of a unit support leg.

FIG. 4 is a plan view showing an arrangement of floor panels and unit support legs.

FIG. 5 is a plan view showing another embodiment of the floor placing method according to the present invention in the case of using a floor panel which is not subjected to ordinary joist and perforation processing, and shows an arrangement form of the floor panel and the unit supporting leg. .

FIG. 6 is a perspective view showing the form of floor placement at the site of the embodiment shown in FIG.

FIG. 7 is a partial cross-sectional view showing an example of construction on site when assembling using a normal joist in the floor placing method of the present invention.

FIG. 8 is a partially cutaway perspective view showing an embodiment of a joist unit used in the floor placing method of the present invention.

FIG. 9 is a plan view showing another embodiment of the floor placing method of the present invention using a joist unit, showing the arrangement of the joist unit, the floor panel and the unit supporting legs.

FIG. 10 is a sectional view taken along the line AA in FIG. 9;

FIG. 11 is an overall perspective view showing one embodiment when a floor placing method using a joist unit according to the present invention is completed.

FIG. 12 is a perspective view of a floor unit, showing a conventional example of a floor placing method.

13 is a perspective view showing a floor placement form of the floor unit shown in FIG. 12 at a site.

FIG. 14 is a partial perspective view showing a floor placement form of another conventional floor unit.

FIG. 15 is a partial cross-sectional view showing a construction example at a site of a floor placing method using a joist.

[Explanation of symbols]

1, 7, 7a floor panel, 2 support legs, 3 floor units, 4 foundation floor (concrete slab), 5 discarded plywood, 6 circular holes, 8 walls or partitions, 9 joists,
DESCRIPTION OF SYMBOLS 10 Unit support leg, 11 rod-shaped leg, 11a support bolt, 12 anti-vibration pedestal, 13 receiving plate, 14 insertion hole,
15 Minus groove, 16 bundles, 17 nails, 18 joist unit, 19 horizontal joist, 20 nut, 21 support bolt, 22 rubber pedestal, 23 through hole

Claims (4)

[Claims] 1. A dry flooring method in which a unit supporting leg group and a floor panel group each including a bar-shaped leg and a receiving plate mounted on the upper end of the bar-shaped leg so as to be vertically adjustable are combined. A joist unit having supporting legs which can be adjusted up and down at least at two places of a horizontal joist when adjusted to a height level is installed along a wall or a partition, and a plurality of unit supports are provided on a floor surface of a foundation floor. The legs are arranged at a predetermined pitch according to the shape of the floor panel, and a plurality of floor panels, with respect to the floor panel facing the wall or the partition, the edge of the wall or the partition side is supported by the joist or the joist unit. On the other hand, for a floor panel not facing a wall or a partition, a predetermined edge portion of the other side is supported by the unit support leg. Are arranged with predetermined gaps such that the upper end surfaces of the bar-shaped legs are exposed, and the floor panels are laid in a state where the floor panels are supported at a predetermined height level by the unit support legs. A characteristic dry flooring method. 2. A double-floor floor base is provided with supporting legs so as to be vertically adjustable in at least two places of a plurality of joists or horizontally long joists installed at a predetermined height level along a wall or a partition. A joist unit having a rod-shaped leg and a receiving plate mounted on the upper end of the rod-shaped leg so as to be adjustable up and down, and arranged on the floor of the foundation floor at a predetermined pitch according to the shape of the floor panel. A plurality of unit supporting legs; and a plurality of floor panels, and a floor panel facing a wall or a partition, the edge of the wall or the partition side is supported by the joist or the joist unit, and the other side is provided. The edge of the predetermined portion is supported by the unit support legs,
On the other hand, a floor panel which does not face a wall or a partition has a predetermined edge portion supported by the unit supporting legs. 3. A receiving plate having a screw hole at a substantially central portion thereof and a pressure-sensitive adhesive sheet adhered to an upper surface of the unit supporting leg, and an upper screw portion screwed into a screw hole of the receiving plate. And a rod-shaped leg composed of a support bolt having a groove on the upper end surface and a pedestal on which the lower end of the support bolt is rotatably implanted. The height of the receiving plate of the unit support leg is adjusted by inserting the tip of the rotary tool into the groove of the upper end surface of the support bolt through the gap, and rotating the support bolt, so that the height level of the laid floor panel is kept constant. The double-floor structure according to claim 2. 4. A cushioning material is interposed between the wall or partition and a lateral joist of the joist unit.
The double floor structure according to 1.