JPH1193383A - Unit support leg and executing method for double-floor using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a unit support leg to facilitate regulation of a mounting position to a foundation floor and firmly fixed at the foundation floor besides to provide an executing method for a double-floor using the support leg. SOLUTION: A unit support leg comprises a floor contact base 1; a support stay 20 rotatably erected on the floor contact base 1; and a support plate mounted regulatablly the height through a level regulating nut screwed on the upper part of the support stay 20. The support stay 20 has an axial hollow part 22. A flange part 21 expanded sideways is formed at the lower end part of the support stay 20. The floor contact base 1 has a press part 2 to hold the flange part 21. The floor contact base 1 is provided at a central part with a protrusion part 2 inserted in the hollow part 22 of the support stay 20. The floor contact base 1 comprises a central through-hole vertically extending through on the inner side of the protrusion part 3; a main adhesion groove communicating with the central through-hole formed in an under surface; and a main anchor hole communicating with a main adhesion groove vertically extending through.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit support leg used for constructing a double floor of a building, and a method of constructing a double floor using the same. It is about firm fixation to the floor.

[0002]

2. Description of the Related Art Conventionally, a device for supporting such a double floor is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 3-17348 and Japanese Utility Model Laid-Open No. 4-116537, in which a bar-shaped leg and an upper end of the bar-shaped leg are vertically adjusted. An apparatus is disclosed for supporting fixed-size rectangular and / or square floor panels by means of unit support legs consisting of possibly mounted receiving plates.

[0003] An example of a conventionally known unit supporting leg is shown in FIG. 13, which includes a floor base (102) made of a relatively hard elastic material such as rubber or synthetic resin, and the floor base (102).
(102), a level adjustment nut (108) having an annular support (109) protruding laterally at a substantially central portion of the outer periphery, And a square or rectangular support plate (110) having an insertion hole (111) into which the upper part of the level adjusting nut (108) is fitted.

The support bolt (104) has an annular flange (1) projecting laterally on the outer peripheral surface at a position separated from the lower end by a predetermined distance upward.
05) are provided integrally, and a screw portion is formed above the flange portion (105), and a base end portion (106) below the flange portion (105) is formed as a round bar portion having a circular cross section. I have. In addition, support bolts (1
A groove for fitting the tip of a rotating tool into the top end surface of 04)
(107) is formed. Then, by inserting the base round bar portion (106) of the support bolt (104) into the center hole (103) of the floor contact base (102), the support bolt (104) The support portion is in a state of being erected on the floor base (102) so as to be freely rotatable.

On the other hand, the upper part of the insertion hole (111) of the support plate (110) is chamfered and expanded. Level adjustment nut (1
08) is fitted into the insertion hole (111) of the support plate (110), and then the upper part thereof is expanded to form a chamfer (112) of the support plate insertion hole (111).
By being partially buried in the support plate, it is firmly attached to the support plate (110). At the same time, level adjustment nut
An adhesive reservoir (113) is formed on the upper part of (108). One or several grooves are formed in the lengthwise direction on the inner thread of the level adjusting nut (108) or the outer thread of the support bolt (104) so that the adhesive can easily flow.

[0006] Thus, the insertion hole (111) of the support plate (110).
To the level adjustment nut (108) fitted to
By screwing the upper end of the screw portion of 4), the unit support leg (101) is assembled as shown in FIG. still,
On the upper surface of the support plate (110), a double-sided pressure-sensitive adhesive sheet (114) is stuck or an adhesive layer is formed.

The unit support leg (101) having such a structure.
When the support bolt (104) is rotated by inserting the tip of a rotary tool such as a screwdriver into the groove (107) provided on the top end surface of the support bolt (104), the level adjustment nut (108) is supported. By moving up and down with respect to the bolt (104), the floor level of the support plate (110) and the floor panel supported by the support plate (110) can be adjusted.

[0008] An example of construction in the case of constructing a double floor using the unit supporting legs (101) assembled as described above is, for example, as shown in FIG.
(121) The joist (or joist unit) along the predetermined height
(112) is provided, on which one side of the floor panel (123) is supported. The other edge of the floor panel (123) that does not contact the joist (112) is at a predetermined pitch and the base floor (concrete slab) (120)
It is mounted on the unit support leg (101) arranged above in a cantilevered state. Unit support leg (101) and floor panel (12
3) is attached through a double-sided adhesive sheet (114) or the like adhered to the upper surface of the support plate (110).
3) is pressure-bonded to the double-sided pressure-sensitive adhesive sheet (114) and temporarily fixed.
The insertion hole (111) of the support plate (110) is exposed from the edge of the floor panel (123), and the support bolt (104) is turned by a driver or the like through the insertion hole (111), and the floor panel (123) is rotated. Adjust floor level.

Similarly, adjacent floor panels (123) are similarly mounted on the unit support legs (101) to perform a predetermined area. After adjusting the floor level, remove the support plate from the floor panel (123).
A nail is nailed to (110), and the floor panel (123) is fixed to the unit support leg (101). Also, an adhesive is injected from the adhesive reservoir (113), and the level adjustment nut (108) and the support bolt (10
4) and fix them. Then floor panels as needed
After laying discarded plywood (124) on (123) or pasting relatively rigid adhesive tape so as to cover the gap between adjacent floor panels (123), cushion floor,
Finish work such as laying CF sheets, carpets, tatami mats, wood flooring and other finishing materials.

[0010]

SUMMARY OF THE INVENTION Unit support leg (101)
Is fixed to the base floor (120) by applying an adhesive to the lower surface of the floor support base (102) of the unit support leg (101) and fixing it to a predetermined portion of the base floor (120). Therefore, the workability of the double floor is poor, the construction time is prolonged, and the construction cost is increased.

Further, once the unit support legs are adhered to the base floor, the unit support legs cannot be moved even if an attempt is made to finely adjust the position of the unit support legs when laying a floor panel or the like.
Furthermore, there is a problem that the floor base (102) is high and unstable, and the bonding area with the base floor is low because the bonding area is small.

Therefore, there is a need for a unit supporting leg that can be easily adjusted to a mounting position on a foundation floor and that can be firmly fixed to the foundation floor, and a method of constructing a double floor using the same.

[0013]

According to the present invention, there is provided a unit supporting leg according to the first aspect of the present invention, which comprises a floor support base, a threaded portion on an upper portion, and a rotatable standing support floor base. A unit support leg having a support column (20) provided, and a support plate (42) mounted to be freely adjustable in height via a level adjustment nut (41) screwed onto the support column (20). The support column (20) has a hollow portion (22) in the axial direction, and a lower end portion of the support column (20) is formed with a laterally expanded flange (21). The stand (1) is
It has a holding portion (2) for holding (1), and a projection (3) inserted into the hollow portion (22) of the support column (20) in the center of the floor support base (1) The floor support base (1) has a central through hole (4) vertically penetrating inside the projection (3) and a main through hole provided on the lower surface and communicating with the central through hole (4). Adhesive groove (6),
It has a main anchor hole (7) penetrating vertically and communicating with the main adhesive groove (6).

When the adhesive (A) is poured into the hollow portion (22) of the support column (20), the adhesive moved downward through the hollow portion (22)
By (A), the lower end of the support column (20) and the floor-contact base (1) are bonded. Further, the adhesive (A) reaches the main bonding groove (6) through the central through-hole (4), and bonds the floor mat base (1) and the base floor. Furthermore, the adhesive (A) that has entered the main anchor hole (7) is
It exerts an anchor effect to prevent (1) from floating away from the foundation floor.

According to a second aspect of the present invention, in the unit supporting leg according to the first aspect, the floor support base (1) is a holding portion.
(2) Inflow through-holes (9) vertically penetrating inside the gaps or holding portions (2), and sub-adhesion grooves (8) provided on the lower surface and communicating with the inflow through-holes (9). And sub-adhesion groove that penetrates up and down
It has a sub-anchor hole (10) communicating with (8).

According to this, in addition to the case of claim 1,
Since the bonding area between the floor support base (1) and the base floor can be increased by the sub-adhesion groove (8) and the anchor effect by the sub-anchor hole (10) can be obtained, the floor floor base (1 ) And the foundation floor are more firmly and securely bonded.

According to a third aspect of the present invention, there is provided the unit supporting leg according to the first or second aspect, wherein the unit supporting leg has an adhesive groove (56) which is wider and shallower toward the outer peripheral side.

According to this, the total bonding area between the floor-contacting base (1) and the base floor is increased, and the bonding area is particularly large on the outer peripheral side which contributes to the bonding strength. Can be. Since the depth of the adhesive groove (56) is reduced toward the outer peripheral side of the floor base, the strength of the outer peripheral portion is not significantly reduced, and sufficient strength can be maintained.

In the method for constructing a double floor according to a fourth aspect, the unit supporting leg according to the first, second, or third aspect is disposed on the foundation floor, and the unit supporting leg is provided on the supporting plate (42). After placing the floor panel, inject the adhesive (A) from the upper part of the support column (20) to support column (20) and floor base (1), and floor base (1)
And a base floor.

According to this, the panel is mounted on the unit support legs without applying an adhesive to the back surface of the floor support base (1) prior to disposing the unit support legs as in the prior art. The adhesive (A) that passed through the hollow portion (22) of the support post (20) simply by injecting the adhesive (A) from the top of the support post (20) later
Is between the support column (20) and the floor support (1), and the floor support (1)
And between the base floor and the base floor.

According to a fifth aspect of the present invention, there is provided a method of constructing a double floor, wherein the unit supporting leg according to the first, second, or third aspect is disposed on a foundation floor, and the floor panel is mounted on a supporting plate (42) of the unit supporting leg. After placing the support column (20), the adhesive (A) is injected from the upper portion of the support column (20) and the adhesive is injected into the main anchor hole (7) of the floor support base (1). And the floor support (1), and the floor support (1) and the base floor are bonded.

According to this, in addition to the above construction method,
Since the adhesive is directly injected into the main anchor hole, the filling of the adhesive becomes more reliable, and the anchor effect by the cured adhesive is easily obtained. Therefore, the adhesion between the foundation floor and the floor support base can be made stronger and more reliable.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to preferred embodiments. [Embodiment 1] FIG. 11 is a front view of a unit supporting leg of this embodiment. In the figure, (1) is a floor mating base that is in contact with the foundation floor, (20) is a support column, (41) is a level adjustment nut,
(42) is a support plate, and (43) is a double-sided pressure-sensitive adhesive sheet.

As the level adjusting nut (41), the support plate (42), and the double-sided pressure-sensitive adhesive sheet (43), which are screwed onto the upper portion of the support column (20), the conventional ones described above can be used.

The floor support base (1) is made of a relatively hard elastic material such as rubber, synthetic resin, etc., and fits on the base floor surface and has a vibration-proof function.

The support column (20) has a hollow portion penetrating in the axial direction. The support post (20) may be a single pipe with a thread threaded above as shown in FIG. 11, but a support post (30) with a hollow bolt attached to a hollow support pipe as shown in FIG. May be used. A flange (21) protruding in the outer peripheral direction is provided at a lower end of the support column (20).

FIG. 1 is a plan view of a floor mat base used in the present embodiment, FIG. 2 is a bottom view thereof, FIG. 3 is a sectional view taken along aa of the floor mat base, and FIG. It is b sectional drawing. FIG.
FIG. 3 is a perspective view of a floor base.

In the figure, reference numeral (2) denotes a holding portion for holding the flange portion (21) of the support column (20), and (5) is formed inside the holding portion (2) for fitting the flange portion. It is the recessed part. The pressing portions (2) are arranged at four locations on a concentric circle, and a gap is provided between adjacent pressing portions (2).

Numerals (3) denote projections provided substantially at the center of the floor support base (1), which are arranged at four locations on concentric circles, and a gap is provided between adjacent projections (3). Is formed. Also,
A central through hole (4) penetrating the floor base (1) in the vertical direction is provided at the center of the four projections (3).

Reference numeral (6) denotes a main adhesive groove provided on the lower surface of the floor base (1), which communicates with the central through hole (4) and radially extends toward the outer peripheral side. (7) is a main anchor hole which communicates with the main adhesive groove (6) and penetrates vertically through the contact floor base (1).

(8) is a sub-adhesion groove provided on the lower surface of the floor base (1), and (9) is the inside of the holding portion (2) or the holding portion (2).
It is a through hole for inflow provided so as to penetrate in the vertical direction between each other, and communicates with the sub-adhesion groove (8). Therefore, the adhesive overflowing in the holding portion (2) flows into the auxiliary bonding groove (8) through the inflow through hole (9). Secondary adhesive groove (8)
Is provided to extend in the outer peripheral direction from the inflow through hole (9).

Unlike the main bonding groove (6), the sub bonding groove (8) does not communicate with the central through hole (4). This is because if there are many grooves communicating to the center, the strength of the floor base (1) becomes weak. (10) is a sub-anchor hole communicating with the sub-adhesion groove (8) and penetrating vertically.

FIGS. 6 and 7 are partial cross-sectional views showing a state in which the floor base (1) is adhered to the floor foundation. The cross section in FIG. 6 is an aa cross section, and the cross section in FIG. 7 is a bb cross section. The support post (20) has a driver groove (24) at the upper end for engaging with a driver. Note that the shape of the upper end portion is not limited to that shown in FIG. 6 as long as the support column (20) can be rotated. For example, a nut shape for engaging a box wrench or the like at the upper end portion of the support column is provided. May be formed.

At the time of construction, first, a floor support base (1) is attached to the lower end of the support column (20). A lower end portion of the support column (20) is formed with a flange portion (21) protruding to the periphery, and the flange portion (21) is formed inside the holding portion (2) of the floor support base (1). Fit into the recess (5) and attach. Support post in this state
(20) is erected on the floor support base (1), and becomes rotatable with respect to the floor support base (1). In this state, the protrusion of the floor base (1)
(3) is located in the hollow part (22) of the support column (20).

A floor panel is laid on the unit supporting legs. Since the fixing of the unit supporting legs to the base floor with an adhesive is performed in a later step, an adhesive is applied to the lower surface of the floor support base (1) at the time of laying. There is no need to apply it in advance.

Next, the floor surface level is adjusted. Since the support column (20) is erected rotatably with respect to the floor support (1), the support column (20) is adjusted by a driver or the like. By rotating, the floor level can be adjusted as in the conventional case.

After the floor level is adjusted, the floor panel is nailed to the unit support legs. After the floor level is adjusted or after the floor panel is nailed, the floor panel is glued from the adhesive pool above the level adjusting nut (41). Pour the agent (A).

The adhesive flowing around the support column (20) adheres and fixes the level adjusting nut and the support column (20) as in the related art. On the other hand, the adhesive (A) poured into the hollow portion (22) of the support column (20) passes through the hollow portion (22) of the support column (20), and the protrusion (3) of the floor support base (1). Leads to.

Accordingly, the adhesive is provided between the projection (3) and the inside of the support column (20), and between the periphery of the projection (3) on the upper surface of the floor support base (1) and the bottom surface of the support column (20). The agent (A) flows in and the floor base (1)
And the support column (20) are firmly fixed.

The adhesive (A) passes through the central through hole (4) inside the projection (3) and reaches the main adhesive groove (6) on the lower surface of the floor base (1). Then, the adhesive (A) flows through the space formed between the base floor and the main bonding groove (6) toward the outer peripheral side of the floor base (1).

The main adhesive groove (6) communicates with the main anchor hole (7). When a foaming adhesive is used as the adhesive (A), the adhesive whose volume has been increased by foaming is shown in FIG. So as to blow up to the upper surface of the floor base (1) through the main anchor hole (7) and harden. If the diameter of the adhesive (A) raised and cured on the upper surface is made to be larger than the diameter of the main anchor hole (7), the adhesion between the adhesive (A) and the lower surface of the floor base (1) is temporarily set. Even if the floor base (1) comes off and rises from the base floor, the floor base (1) is caught by the hardened adhesive around the upper surface of the main anchor hole (7) and cannot be lifted. The effect is obtained.

Since a gap is provided between the projections (3), the adhesive (A) reaching the lower end of the support column (20)
Spills out of the projections (3) on the upper surface of the floor base (1) through this gap. Then, the adhesive (A) passes through the through-hole (9) for inflow, reaches the sub-adhesion groove (8) on the lower surface of the floor base (1), and is formed between the base floor and the sub-adhesion groove (8). Flows through the space to the outer peripheral side of the floor base (1).

The sub-adhesion groove (8) communicates with the sub-anchor hole (10), and the adhesive (A) is applied to the sub-anchor hole (1) as shown in FIG.
It rises on the upper surface of the floor base (1) through 0). The diameter of the adhesive (A) raised and cured on the upper surface is
When the diameter is larger than the diameter of the main anchor hole
As in the case of (7), an anchor effect of preventing lifting is obtained.

In this embodiment, a taper is provided above the main anchor hole (7) and the sub-anchor hole (10) so that the diameter on the upper surface side is increased. In this case, the adhesive is
Even if the adhesive does not swell on the upper surface of (1), the adhesive
An anchor effect can be obtained by entering the tapered portions of (7) and (10).

When the adhesive is poured into the hollow portion (22) from the upper end of the support column (20) and hardened, the adhesive flowing into the main adhesive groove (6) and the auxiliary adhesive groove (8) on the lower surface is formed. With (A), the floor base (1) and the base floor are adhered over a wide area,
Due to the anchor effect, the floor base (1) is firmly fixed to the foundation floor. In particular, an adhesive that foams and cures as the adhesive (A),
For example, the use of a moisture-curable urethane foam or the like is preferable because the space between the floor base (1) and the base floor can be filled without gaps.

Depending on the type of the adhesive, the main adhesive groove (6), the main anchor hole (7), the auxiliary adhesive groove (8), and the auxiliary anchor hole (10) may not be sufficiently filled. If you want to make sure the bond, use the main anchor hole if necessary
The adhesive (A) may be directly injected and filled from (7) and the auxiliary anchor hole (10).

In the present embodiment, the auxiliary bonding groove (8) is provided in addition to the main bonding groove (6). However, sufficient mounting strength can be obtained by the main bonding groove (6) and the main anchor hole (7). In such a case, the auxiliary adhesive groove (8), the inflow through hole (9) communicating with it,
(10) is not always necessary.

As described above, since the floor panel is attached to the unit supporting leg and the unit supporting leg can be fixed to the foundation floor even after the floor level is adjusted, prior to the conventional construction. Strictly measure the mounting position of the floor base (1),
The troublesome work of applying an adhesive to the lower surface of the floor base (1) and bonding it to the base floor is not required. Therefore, it is possible to construct the double floor more easily and in a shorter time than before. The double floor of the present invention can be used regardless of the structure of an apartment, a wooden house, or the like.

[Embodiment 2] FIG. 8 is a bottom view of the floor base used in the present embodiment, and FIG. 9 is a sectional view of the floor base taken along the line aa.

The basic structure is the same as that of the first embodiment, but the shape of the main adhesive groove (56) of the floor base (51) is different. That is,
In this embodiment, the width of the main adhesive groove (56) becomes wider and the depth becomes shallower toward the outer peripheral side of the floor base (51).

Accordingly, the total bonding area increases, and particularly, the bonding area increases toward the outer peripheral side which contributes to the bonding strength, so that stronger bonding can be performed. In addition, since the depth of the main adhesive groove (56) is reduced toward the outer peripheral side of the floor base (51), the strength of the outer peripheral portion does not greatly decrease, and sufficient strength can be maintained. it can.

In this embodiment, the main adhesive groove (56) is formed such that its width becomes wider and its depth becomes shallower toward the outer peripheral side. However, instead of the main adhesive groove (56), a sub-adhesive groove is formed. A similar shape may be used.

[Embodiment 3] FIG. 10 is a sectional view of a floor-contact base (61) used in this embodiment. In this embodiment, the basic configuration is the same as that of the first embodiment, except that the surface of the main bonding groove (66) of the floor base (61) is provided with irregularities (66a). This increases the bonding area and improves the bite of the adhesive, so that stronger bonding can be performed than in the first embodiment. Other configurations are the same as in the first embodiment.

The number, size, shape, and the like of the holding portions, protrusions, adhesive grooves, anchor holes, and the like may be appropriately changed as necessary, and are not limited to those described in the above embodiments. .

[Peeling Strength Test] In order to examine the adhesive strength between the support leg and the floor, the following test was performed. Three types of unit supporting legs with different floor mating bases are poured into a concrete block with a moisture-curable urethane foam adhesive and adhered to the hollow part of the supporting column in the same way as in actual construction. Tested according to The floor support bases of the unit supporting legs used in the test are the following three types. (A) Floor contact base having no bonding groove or anchor hole on the back surface (A) Floor contact base similar to that of Example 1 except that it does not have a protrusion (c) Floor contact base of Example 1 Table 1 shows the test results.

[0056]

[Table 1]

(A) has a peel strength about 1.8 times that of (A). In this case, the bonding strength between the floor base and the concrete block (floor surface) is improved by the bonding groove and the anchor hole on the back surface, but the support is performed before the floor base is separated from the concrete block. Since the column is separated from the holding portion of the floor support, it is necessary to further strengthen the retaining at this portion.

The peel strength of (c) is about 2.5 times higher than that of (a). In this case, the support column was firmly adhered to the floor base, and finally showed the peel strength of the concrete block surface, and a significant improvement in peel strength was realized.

[0059]

As described above, according to the present invention, a unit support leg which can be easily adjusted to a mounting position on a foundation floor and can be firmly fixed to the foundation floor, and a method for constructing a double floor using the same. Could be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a floor support base used in a first embodiment.

FIG. 2 is a bottom view of the floor base used in the first embodiment.

FIG. 3 is an aa cross-sectional view of the floor support base used in the first embodiment.

FIG. 4 is a bb cross-sectional view of the floor floor base used in the first embodiment.

FIG. 5 is a perspective view of a floor base used in the first embodiment.

FIG. 6 is a partial cross-sectional view showing a state in which the floor base is adhered to a floor foundation.

FIG. 7 is a partial cross-sectional view showing a state in which the floor base is adhered to a floor foundation.

FIG. 8 is a bottom view of the floor base used in the second embodiment.

FIG. 9 is an aa cross-sectional view of a floor support base used in the second embodiment.

FIG. 10 is a sectional view of a floor base used in a third embodiment.

FIG. 11 is a front view of a unit supporting leg.

FIG. 12 is a front view of a unit support leg provided with another support column.

FIG. 13 is a partial sectional view of a conventional unit supporting leg.

FIG. 14 is a cutaway perspective view showing a state in which a floor panel having a double floor is constructed using conventional unit supporting legs.

[Explanation of symbols]

 (1) Floor base (2) Holding part (3) Projecting part (4) Central through hole (5) Concave part (6) Main adhesive groove (7) Main anchor hole (8) Secondary adhesive groove (9) Inflow Through hole (10) Secondary anchor hole (20) Support post (21) Flange of support post (22) Hollow portion of support post (23) Screw portion of support post (24) Driver groove of support post (A) Adhesive

Claims (5)

[Claims] 1. A floor support base, a support post having a threaded portion formed on an upper portion thereof and rotatably erected on the floor support base, and a level adjusting nut screwed on the support support upper portion. A unit support leg having a height-adjustably mounted support plate, wherein the support column has a hollow portion in the axial direction, and a lower end portion of the support column is formed with a laterally expanded flange. The floor mounting base has a holding portion for holding a flange, and a central portion of the floor mounting base is provided with a protrusion inserted into a hollow portion of the support column. The base has a central through hole vertically penetrating inside the protrusion, a main adhesive groove provided on the lower surface and communicating with the central through hole, and a main anchor hole penetrating vertically and communicating with the main adhesive groove. A unit supporting leg, characterized in that: 2. The floor contacting base includes an inflow through hole vertically penetrating into a gap between the holding portions or inside the holding portion, a sub-adhesion groove provided on a lower surface and communicating with the inflow through hole, 2. The unit supporting leg according to claim 1, further comprising a sub-anchor hole that penetrates through the sub-adhesion groove and communicates with the sub-adhesion groove. 3. The unit supporting leg according to claim 1, wherein the unit supporting leg has an adhesive groove which is wider and shallower in depth toward the outer peripheral side. 4. The unit support leg according to claim 1, 2 or 3 is disposed on a foundation floor, and a floor panel is placed on a support plate of the unit support leg, and then an adhesive is applied from above the support column. A method of constructing a double floor, characterized by bonding the support column to the floor base, and the floor floor base to the foundation floor by injecting water. 5. The unit support leg according to claim 1, 2 or 3 is disposed on a base floor, and a floor panel is placed on a support plate of the unit support leg, and then an adhesive is applied from above the support column. Double floor construction characterized by bonding the support strut to the floor support base and the floor support base to the base floor by injecting adhesive and injecting adhesive into the main anchor hole of the floor support base Method.