JP2009144350A - Double floor structure for floor preceding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a floor creak phenomenon, and to surely fix a floor runner etc. of a partition wall to a sub-floor board along a joint of the sub-floor board while avoiding the joint. <P>SOLUTION: In this double floor structure (S) for a floor preceding method, a corner portion or an edge of the sub-floor board (3) is supported by an upper supporting plate (14) of a supporting leg (1) which is disposed on a concrete floor slab (C); a board buffer material (4) is fixed onto the sub-floor board; and a floor finishing material (5) is further fixed onto the board buffer material. The sub-floor board and the board buffer material, which have substantially the same board width and substantially the same board length, form an integral composite board (7) by being integrally superposed in the state of being aligned with the same upper and lower positions so as to form the joints (6) in positions substantially flush with each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a double floor structure of a floor advance construction method, and more particularly, a floor advance construction method in which a floor base plate, a board cushioning material and a floor finishing material are supported by support legs arranged on a concrete floor slab. It is related to the double floor structure.

  As a construction method for double-floor structures in medium- and high-rise buildings, after the construction of interior partition walls, a wall-advanced construction method of constructing a dry double floor on a concrete floor slab, and after constructing a dry double floor on a concrete floor slab It is known that the floor precedent method for constructing interior partition walls.

  The floor advance construction method that supports interior partition walls on a dry double floor is superior in terms of the degree of freedom in building plan planning, etc., and the formation and securing of piping and wiring space for building facilities. It adapts to the recent trend of building technology that emphasizes the development of barrier-free, barrier-free, SI (skeleton infill) housing, etc. For this reason, aggressively adopt the advanced floor construction method in the design and construction of apartment buildings, etc. The trend is particularly noticeable in recent years.

  In such a floor structure of the preceding floor construction method, the lower part of the partition wall does not reach the concrete floor slab, but is supported by the concrete floor slab via a dry double floor. For this reason, it is necessary to construct the floor structure and the partition wall so that the load on the partition wall is reliably transmitted to the concrete floor slab by the support legs without excessively acting on the floor finish or the floor base plate.

  However, in the dry double-floor floor advance method, after arranging a large number of support legs on the concrete floor slab and fixing the floor base plate on the support plate above the support legs, the interior partition wall is placed on the floor base plate. Since the process of construction is generally adopted, many support legs are concealed in the underfloor space by the floor base plate at the stage of partition wall construction. For this reason, when constructing a partition wall, the position of a support leg cannot be visually confirmed and it is difficult to specify the position correctly.

  Under such circumstances, various countermeasures have been proposed in the past, as exemplified in Patent Documents 1 to 4, regarding the support structure for the lower part of the partition wall in the floor prior construction method.

  For example, in the double floor structure described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2005-264615), a communication hole that communicates the underfloor space and the above-floor space is formed in the underfloor material, and the underfloor space below the partition wall is formed. The foamed resin is injected to form a foamed resin molded body, and the foamed resin molded body tries to at least partially transmit the load on the partition wall to the concrete floor slab.

  In the double floor structure described in Patent Document 2 (Japanese Patent Application Laid-Open No. 2005-290708), a joist unit that reinforces the floor structure in the underfloor space is disposed in advance directly under the partition wall.

  In the double floor structure described in Patent Documents 3 and 4 (Japanese Patent Laid-Open No. 2001-295451, Japanese Patent Laid-Open No. 6-108568), a circular opening is formed in the floor base material after the floor base material is constructed. The reinforcing support legs or adjuster bolts are erected on the concrete floor slab so as to penetrate the opening, the support member or liner member is fixed to the upper end of the reinforcing support legs on the upper side of the floor, and the partition wall is the support member Installed on top. In the double floor structure having this configuration, the load on the partition wall does not act on the floor base material and the floor finishing material, but is directly transmitted to the concrete floor slab via the reinforcing support leg or the adjuster bolt.

  On the other hand, as a measure for improving the sound insulation performance or impact resistance performance of the floor itself of such a double floor structure, a hard gypsum board or a structural gypsum board having a relatively high specific gravity or rigidity is used between the floor base plate and the floor finishing plate. Patent Documents 5 and 6 (Japanese Patent Laid-Open Nos. 2000-170279 and 10-292610) and the like describe a double floor structure having a structure interposing a board-based cushioning material. Hard plaster board (product name “Tiger Super Hard” (product of Yoshino Gypsum Co., Ltd.)) whose core material and surface layer are reinforced with glass fiber, glass fiber nonwoven fabric, etc. as a board building material that can be suitably used as such a board cushioning material ), Fiber reinforced gypsum board (product name “Tiger Glass Rock” (product of Yoshino Gypsum Co., Ltd.)) and the like.

  In the double floor structure of the floor advance construction method using such a board-type cushioning material, a particle board is usually used as a floor base plate. A particle board is a relatively thick face material that has been hot-pressed by applying a synthetic resin adhesive to a cut or crushed piece of wood (chip), has no anisotropy, and is excellent in strength. Plates with a thickness of about 10 to 30 mm are widely distributed in the building materials market.

The floor base plate of the particle board is fixed to a rectangular support plate at the upper part of the support leg with a nail, an adhesive or the like. Usually, the support plate is also a piece of particleboard. Board cushioning material such as gypsum board or gypsum board is placed on the floor base plate so as to straddle multiple floor base plates, fixed to the floor base plate with screws, nails, adhesive, etc., and floor finish such as flooring material The material is further laid on the board cushioning material.
JP-A-2005-264615 JP-A-2005-290708 JP 2001-295451 A JP-A-6-108568 JP 2000-170279 A JP-A-10-292610

  Regarding the floor structure using such a board-type cushioning material, the following problems have occurred in recent construction examples.

  (1) Flooring may occur after the construction of the floor structure. The floor squeaking phenomenon occurs due to uncertain and complex factors such as the type, size, arrangement, spacing, assembly state, fixing method, drying / shrinkage, and the like, and it is difficult to identify the cause.

  (2) When building a partition wall on board cushioning material, it is desirable to firmly screw or anchor the steel runner (floor runner) and wood of the partition wall to the floor base plate (particle board), When screwing in or screwing in from the board cushioning material, the see-through joint of the floor base plate may be located directly under the screw fastening position or mooring position, and the steel runner etc. is firmly fixed to the floor base plate It may be difficult (FIGS. 9 and 10).

  As a countermeasure for the above problem (1), it is considered that the floor noise phenomenon can be prevented by appropriately selecting the materials of the floor base plate and the board cushioning material. However, considering the overall performance of building materials such as strength, durability, sound insulation, heat insulation, etc., as well as the price, availability, and distribution of building materials in the actual market, the current floor base plate and board buffer It is difficult to change the material of the material easily.

  Further, as a countermeasure against the above problem (2), as described in Patent Documents 1 and 2, a method of constructing a foamed resin molded body and a reinforcing joist unit in an underfloor space, or the aforementioned Patent Documents 3 and 4 are used. As described in, the floor base plate and board cushioning material are drilled and reinforcing support legs or adjuster bolts are erected on the concrete floor slab, and the steel runner and the like are directly attached to the concrete floor slab by this type of reinforcing member. It is also possible to consider adopting a method of fixing to. However, the former measures are too disadvantageous in terms of construction labor, workability, price, construction period, etc., and are difficult to adopt in reality. The latter countermeasures are construction labor, workability, price, construction period, etc. In addition to the above problem, there is a problem such as a cross-sectional defect of the floor material due to on-site processing of the floor base plate and the board cushioning material, and there are circumstances that are difficult to adopt from the viewpoint of securing the strength of the floor structure.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a board cushioning material that improves the sound insulation performance and impact resistance performance of the floor between the floor finishing material and the floor base plate. In the double floor structure of the intervening floor advance construction method, the floor noise phenomenon is prevented, and the floor runner of the partition wall can be securely fixed to the floor base plate along the joint while avoiding the joint of the floor base plate The object is to provide a double floor structure of a prior construction method.

In order to achieve the above object, the present invention supports the corners or edges of the floor base plate by the upper support plates of the support legs arranged on the concrete floor slab, and fixes the board cushioning material on the floor base plate. In the double floor structure of the floor prior construction method for further fixing the floor finishing material on the board-based cushioning material,
The floor base plate and the board cushioning material have substantially the same board width and board length, and are integrally aligned in the same vertical position so as to form joints at substantially the same plane position. Laminated to form an integral composite board,
The floor finishing material is fixed to the upper surface of the board-type cushioning material so as to straddle the adjacent composite plates, thereby providing a double floor structure.

  According to the above-described configuration of the present invention, the floor base plate and the board cushioning material have the same planar contour, and are formed by integrating a single board cushioning material and a single floor backing plate into a single integrated body. The composite plate is supported by the support legs. That is, since one board cushioning material is fixed to one floor base plate, each floor base plate has its own expansion, contraction, deformation due to environmental changes such as humidity change, temperature change, etc. Or, even if it shows behavior, the floor base plate is not integrated with a plurality of board cushioning materials, but only with a specific board cushioning material. Flooring due to relative displacement is unlikely to occur.

  In addition, hard gypsum board, fiber reinforced gypsum board, etc., which hardly stretch, deform or behave due to environmental changes or secular change, etc. are used as board cushioning materials, and each board cushioning material is laminated integrally on each floor base plate By doing so, the expansion, contraction, or behavior of the floor base plate can be restrained or suppressed by the board cushioning material, and the occurrence of the floor noise phenomenon can be reliably prevented.

  Furthermore, since the board cushioning material and the floor base plate form joints at substantially the same plane position, the joint position of the floor base plate can be specified from the floor after the construction of the board buffer material. For this reason, a fixing tool (such as a screw) for constructing the partition wall is securely and firmly driven or screwed into the floor base plate at a position separated from the joint of the floor base plate, and the support arranged along the joint of the floor base plate The load on the partition wall can be reliably transmitted to the concrete floor slab via the legs.

  In addition, according to such a floor structure, the vibration transmission path between the adjacent rooms is blocked by the joint, thereby reducing the heavy floor impact sound (air escape effect) using the joint. Or design the floor structure so as to divide the scope of future renovation or remodeling work according to the joint location and thereby eliminate unnecessary peripheral work problems that may occur during refurbishment or remodeling. It becomes possible.

  Actually, it is difficult to perfectly align the board cushioning material and the floor base plate near the wall of the room, in the vicinity of openings such as doors and windows, or in irregular floor shapes. Accordingly, it should be understood that the alignment of the board-based cushioning material and the floor baseplate relates to the main floor area of the chamber excluding such portions.

  Preferably, as a joint for the floor base plate and the board cushioning material, a through joint that forms a gap between the edges of the composite plate is employed. The joint width is desirably set to the same or smaller dimension than the thickness of the floor base plate. For example, when a particle board having a thickness of 20 mm is used as the floor base plate, the joint width of the see-through joint is set to 20 mm or less.

From another point of view, the present invention supports a corner base or an edge of a floor base plate on an upper support plate of a support leg arranged on a concrete floor slab, and fixes a board cushioning material on the floor base plate, In the double floor structure construction method of the floor advance construction method that further fixes the floor finishing material on the board cushioning material,
The floor base plate and board cushioning material having substantially the same board width and board length are integrally laminated in a state where they are aligned at the same vertical position to form an integral composite plate, and between adjacent composite plates. To form a joint joint,
According to another aspect of the present invention, there is provided a construction method for a double floor structure, wherein the underfloor space between the concrete floor slab and the floor base plate is communicated with the above-floor space above the composite plate by the see-through joint.

  According to such a construction method, after the floor structure is constructed, the underfloor space and the above-floor space are communicated, and, for example, the following construction form or design / construction is adopted by the communication between the underfloor space and the above-floor space. It becomes possible.

(1) Before the construction work is completed, the moisture in the underfloor space is vented to the floor to promote the drying and hardening of the concrete floor slab, or the moisture or steam staying in the underfloor space is discharged.
(2) Ensure a ventilation path that allows moisture or vapor in the underfloor space to flow above the floor with a clear joint between the composite boards.
(3) Block the vibration transmission path between adjacent rooms by joints.
(4) Utilize joints to reduce heavy floor impact noise (air escape effect).
(5) To divide the scope of future renovation or remodeling work according to the joint location, and to solve the problems of unnecessary peripheral work during renovation or remodeling.

  According to the present invention, in the double floor structure of the floor prior construction method in which the board cushioning material that improves the sound insulation performance and impact resistance performance of the floor is interposed between the floor finishing material and the floor base plate, While preventing, the floor runner etc. of a partition wall can be reliably fixed to a floor base plate along the joint, avoiding the joint of a floor base plate.

  In addition, according to the configuration of the present invention in which a see-through joint is formed between the floor base plate and the board-based cushioning composite plate, ventilation in the underfloor space, ventilation, blocking of the vibration transmission path between adjacent rooms, and reduction of heavy floor impact sound Advantages such as (air venting effect) or limitation of the scope of future repairs or remodeling work can be obtained.

  According to a preferred embodiment of the present invention, the floor base material is a particle board, and the board cushioning material is a hard gypsum board, a structural gypsum board, or a fiber-reinforced gypsum board. Preferably, the hard gypsum board, structural gypsum board or fiber reinforced gypsum board has a specific gravity in the range of 0.75 to 1.70, more preferably a specific gravity of 0.9 or more (specific gravity 0.9 to 1.70).

  In a preferred embodiment of the present invention, the interior partition wall is constructed on the board-type cushioning material at a position directly above the joint. A partition wall constituting member such as a floor runner is fixed to the composite plate (floor base plate) by fixtures positioned on both sides of the joint. If desired, at least a part of the joint directly under the partition wall is not concealed by the floor finishing material, and the internal hollow region (floor space) and the under floor space of the partition wall communicate with each other through the joint in a ventilation state. Preferably, an opening for ventilation is formed in the floor runner of the partition wall at a position aligned with the joint.

  If desired, a butt joint formed by abutting the edge of the composite plate may be adopted as the joint shape of the floor base plate and the board cushioning material.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG.1 and FIG.2 is a diagram which shows the correlation of the impregnation rate, temperature, and expansion-contraction rate in various board building materials, such as a gypsum board and a particle board.

  FIG. 1 shows the rate of change in length of gypsum board, cedar board and lauan plywood associated with changes in relative humidity and temperature, and FIG. The length change rate of the hard board (hard fiber board) is shown.

  As shown in FIG. 1, gypsum board has high dimensional stability, and the dimensional change of gypsum board associated with humidity change and temperature change is very small. Similarly, Lauan plywood, a typical building material plywood, and cedar board, a typical natural wood building material, also have good dimensional stability and relatively small dimensional changes associated with humidity and temperature changes. . On the other hand, the dimensional change of the particle board and the hard board related to the humidity change and the temperature change is extremely large as shown in FIG. 2, and the dimensional change due to the humidity change is particularly noticeable.

  The squealing phenomenon that occurs in a double-floor structure in which a floor base plate (particle board) and board cushioning material (gypsum board) are laminated is mainly the dimensional change and displacement of the floor base plate and board cushioning material related to humidity changes. Or it is thought that it originates in the difference in behavior.

  3 and 4 are longitudinal sectional views showing the structure of the double floor structure S according to the embodiment of the present invention, and FIGS. 5, 6 and 7 show the double floor shown in FIG. 3 and FIG. FIG. 4 is a partially broken perspective view, a plan view, and a partially enlarged plan view of a structure S.

  The double floor structure S has a configuration for preventing a floor noise phenomenon, avoiding joints of the floor base plate, and allowing the floor runner of the partition wall and the like to be securely fixed to the floor base plate along the joint. That is, the double floor structure S supports the corners or edges of the floor base plate 3 by the support plates 14 of the support legs 1 arranged on the concrete floor slab C, and the board cushioning material on the floor base plate 3. 4 is fixed, and the floor finishing material 5 is further fixed on the board cushioning material 4. The floor base plate 3 and the board cushioning material 4 have substantially the same board width and board length. These are integrally laminated in a state aligned with the same vertical position so as to form joints 6 at substantially the same plane position, thereby constituting an integral composite plate 7. The floor finishing material 5 is fixed to the upper surface of the board cushioning material 4 so as to straddle the joint 6 between the adjacent composite plates 7.

  The structure of the double floor structure S configured as described above will be described in detail below.

  As shown in FIGS. 3 and 4, the double floor structure S of the floor prior construction method is a structure in which a large number of support legs 1 are erected on a concrete floor slab C and the floor base plate 3 is supported by a large number of support legs 1. Have Each support leg 1 is fitted with a vibration isolating base 11 seated on the top surface of the concrete floor slab C, a column 12 with an external screw extending vertically upward from the vibration isolating base 11, and a coupling 13 with an internal screw at its center. It is composed of a swaged horizontal support plate 14. The inner screw of the connector 13 is screwed with the outer screw of the support column 12. The corners and edges of each floor base plate 3 are fixed on the support plate 14.

  The floor base plate 3 is made of a particle board having a thickness of 20 mm, a width of 600 mm, and a length of 1820 mm, and is fixed to the upper surface of the support plate 14 by screws or nails. If desired, an adhesive may be used in combination for fastening the floor base plate 3 to the support plate 14. Between the floor base plate 3 and the concrete floor finishing material C, an underfloor space 2 is formed that is concealed from the indoor space except for the gaps of the joints 6.

  A board cushioning material 4 is laminated on the floor base plate 3, and a floor finishing material 5 is further laminated on the board cushioning material 4. The board cushioning material 4 is made of a hard gypsum board having a thickness of 12.5 mm, a width of 600 mm, and a length of 1820 mm, and is fixed to the upper surface of the floor base plate 3 by a fixing tool such as a screw or a nail. If desired, the board cushioning material 4 may be fixed to the floor base plate 3 using a fixture and an adhesive.

  The floor finish material 5 is made of, for example, a wooden flooring material having a thickness of 12 mm, and is integrally formed on the board cushioning material 4 by using a fixture or an adhesive such as a screw or a nail, or a combination of the fixture and the adhesive. Is laminated. As shown in FIGS. 3 and 4, the floor finish 5 is fixed to the upper surface of the board-type cushioning material 4 so as to straddle the adjacent composite plate 7, and the composite plate 7 separated by the joint 6 is used as a support. They are interconnected via the plate 14 and the floor covering 5 and structurally connected to the adjacent composite plate 7.

  The load of the double floor structure S is transmitted to the concrete floor slab C through the vibration isolation pedestal 11. The anti-vibration base 11 is made of a molded product such as a rubber material. As shown in FIG. 5, the vibration isolation pedestal 11 receives the column 12. As shown in FIG. 7, the upper end portion of the support column 12 has a screw head groove 18 that can be engaged with a driver tip portion, a hexagon wrench, or the like. The support plate 14 can be positioned at a desired level by engaging a screwdriver or a hex wrench tip with the groove 18 and rotating the support column 12 to raise and lower the support plate 14.

  As shown in FIG. 7, the support plate 14 has a square outline in plan view, and the axis of the support column 12 is located at the center of the support plate 14. The edges of the floor base plate 3 are spaced apart from each other by a distance T, and the board cushioning materials 4 are also spaced apart from each other by a distance T. In this example, the interval T is set to about 15 mm. As shown in FIGS. 6 and 7, a see-through joint (gap) 6 having a spacing T intersecting at the center position of the support plate 14 is formed vertically and horizontally in a plan view.

  The portion of the double floor structure S associated with the partition wall W is shown in FIG. The partition wall W is composed of a dry partition wall having a structure in which a board building material such as a gypsum board is fixed to a steel base or a wooden base. In this example, the partition wall W is formed of a light iron partition wall having a steel base 51 assembled with members such as upper and lower steel runners, steel stats, bracings, and spacers. FIG. 4 shows only the floor runner 55 and the stud 56 that constitute the steel base 51. An underboard 52 and an upper board 53 such as a plaster board are fixed to the steel base 51, and a skirting board 54 is attached to the lower part of the partition wall W.

  The joint 6 is disposed at the wall core position of the partition wall W. The floor runner 55 is fixed to the composite plate 7 by fixing tools 60 such as screws positioned on both sides of the joint 6. The fixing tool 60 penetrates the board cushioning material 4 and is screwed into the floor base plate 3 to securely and firmly fix the floor runner 55 to the floor base plate 3. If desired, an opening 59 such as a hole, a groove, or a notch is formed in a portion of the floor runner 55 that is positioned directly above the joint 6. The underfloor space 2 communicates with the internal hollow region (floor space) of the partition wall W through the opening 59 in a vented state.

  The floor impact vibration i in the chamber on one side of the partition wall W is schematically shown in FIG. The impact vibration i caused by the excitation force or impact on the floor surface is transmitted to the composite plate 7 directly below. The joint 6 isolates the adjacent composite plates 7 from each other and prevents the transmission of impact vibration i between the adjacent chambers.

  In addition, by opening the underfloor space 2 locally indoors without being completely sealed, an effect of reducing heavy floor impact sound (so-called air venting effect) can be obtained. The joint 6 and the opening 59 exhibit an air venting effect that opens the sound of the underfloor space 2 to the internal hollow region of the partition wall W, as indicated by an arrow j in FIG.

  Furthermore, the joint 6 and the opening 59 can form a ventilation path for ventilating the moisture in the underfloor space 2 onto the floor.

  FIG. 9 is a longitudinal sectional view showing a configuration of a conventional double floor structure as a comparative example, and shows a structure of a floor portion related to an interior partition wall. 9, components or members that are substantially the same as or equivalent to the components or members of the embodiment shown in FIGS. 1 to 8 are given the same reference numerals.

  In the conventional double floor structure as shown in FIG. 9, the board cushioning material 4 extends over the joint 9 of the floor base plate 3, and is screwed to the floor base plate 3 on both sides of the joint 9. It is fixed with nails and adhesives. In the double floor structure having such a structure, as described above, there is a problem that a floor squeal phenomenon occurs after the construction of the floor structure, and also the effect of preventing the transmission of the impact vibration i to the adjacent room, the heavy floor impact sound. It is also impossible to expect the effects of the present invention, such as the reduction effect (air venting effect) and the ventilation or ventilation effect of the underfloor space 2.

  FIG. 8 is a longitudinal sectional view showing a construction method of the double floor structure S shown in FIGS.

  In the construction, the support legs 1 are erected on the concrete floor slab C (FIG. 8A), and the corners or edges of the floor base plate 3 are fixed on the support plate 14 with screws, nails, adhesive, or the like. (FIG. 8 (B)). The floor base plate 3 is spaced apart from the center of the support plate 14 with a spacing T left and right symmetrically. The board cushioning material 4 is integrally laminated on the floor base plate 3 with screws, nails, an adhesive, and the like (FIG. 8C). The board cushioning material 4 is also spaced apart with a spacing T symmetrically with respect to the center of the support plate 14. The joints 6 having a distance T formed between the composite plates 7 extend vertically and horizontally in plan view.

  In the floor portion not related to the partition wall W, the floor finishing material 5 is formed of the board-type cushioning material 4 so as to straddle the adjacent composite plate 7 by a nail, an adhesive, or the like, as shown in FIG. Fixed to the top surface. On the other hand, in the floor portion related to the partition wall W, the floor finishing material 5 is placed in FIG. 8 (F) by a nail, an adhesive, or the like after the partition wall W shown in FIG. As shown, it is fixed on the board cushioning material 4 on each side of the partition wall W.

  As shown in FIGS. 8 (B) and 8 (C), steam M such as water vapor evaporates from the concrete floor slab surface during concrete drying and hardening during construction work. The concrete floor slab is dried and hardened.

  Further, the floor board building material (floor finishing material 5, board cushioning material 4 and floor base plate 3) does not extend across the chambers on both sides of the partition wall W, as shown in FIG. Therefore, when one room is retrofitted or modified in the future, the process and work of dismantling and restoring the floor of the adjacent room can be eliminated or simplified.

  FIG. 10 is a longitudinal sectional view showing the construction method of the conventional double floor structure (comparative example) shown in FIG. 9 in stages. In construction, the steps of installation of the support leg 1 (FIG. 10A), fastening of the floor base plate 3 (FIG. 10B), and fixing of the board cushioning material 4 (FIG. 10C) are performed. Then, the process of laying the floor finishing material 5 or assembling and laying the partition wall W and the floor finishing material 5 (FIGS. 10E and 10F) is performed.

  Regarding the construction method of the present invention (FIG. 8) and the conventional construction method (FIG. 10), the basic work procedure is generally the same, but in the conventional construction method, a relatively early stage (FIG. 10 (C ), The underfloor space 2 is substantially completely hidden, and the steam M stays in the underfloor space 2. In addition, as shown in FIG. 10 (F), the board cushioning material 4 extends between the adjacent rooms. Therefore, when one of the rooms is repaired or remodeled, a process and work for dismantling and restoring the floor of the adjacent room are required. It becomes.

  The preferred embodiments and examples of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments and examples, and is within the scope of the present invention described in the claims. It is needless to say that various changes or modifications can be made in the above, and such changes or modifications are also included in the scope of the present invention.

  For example, although the above-mentioned embodiment adopts a see-through joint as the joint of the floor base plate and the board-type cushioning material, a butt joint may be adopted as the joint of the floor base plate and the board-type cushioning material. .

  Moreover, although the said Example uses a particle board as a floor foundation board and uses hard gypsum board as a board-type buffer material, board building materials, such as a hard board, a wood type plywood, MDF, and OSB, are used as a floor foundation board. Various hard gypsum boards such as ordinary hard gypsum board, sizing hard gypsum board, decorative hard gypsum board, etc., or structural gypsum board or fiber reinforced gypsum board, etc. Also good.

  The present invention supports the corner or edge of the floor base plate by the upper support plate of the support legs arranged on the concrete floor slab, fixes the board cushioning material on the floor base plate, and on the board cushion material. It is applied to the double floor structure of the floor prior construction method for further fixing the floor finishing material and its construction method.

It is a diagram which shows the correlation of the impregnation rate, temperature, and expansion-contraction rate in a gypsum board, a lauan plywood, and a cedar board. It is a diagram which shows the correlation of the impregnation rate, temperature, and expansion-contraction rate in a particle board and a hard board. It is a longitudinal cross-sectional view which shows the structure of the double floor structure which concerns on the Example of this invention, and the structure of the floor part which is not related with the interior partition wall is shown. It is a longitudinal cross-sectional view which shows the structure of the double floor structure which concerns on the Example of this invention, and the structure of the floor part relevant to the interior partition wall is shown. FIG. 5 is a partially broken perspective view of the double floor structure shown in FIGS. 3 and 4. It is a top view of a double floor structure. FIG. 7 is an enlarged plan view of a “a” portion shown in FIG. 6. It is a longitudinal cross-sectional view which shows the construction method of the double floor structure shown in FIGS. 3-7 in steps. It is a longitudinal cross-sectional view which shows the structure of the conventional double floor structure as a comparative example, and the structure of the floor part relevant to the interior partition wall is shown. It is a longitudinal cross-sectional view which shows the construction method of the conventional double floor structure (comparative example) shown in FIG. 9 in steps.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support leg 2 Underfloor space 3 Floor baseplate 4 Board-type buffer material 5 Floor finishing material 6 Joint 7 Composite board 55 Floor runner 59 Opening 60 Fixture S Double-floor structure C Concrete

Claims (7)

The corner support or the edge of the floor base plate is supported by the upper support plate of the support legs arranged on the concrete floor slab, the board cushioning material is fixed on the floor base plate, and the floor finish is placed on the board cushioning material. In the double floor structure of the floor prior construction method that further fixes the material,
The floor base plate and the board cushioning material have substantially the same board width and board length, and are integrally aligned in the same vertical position so as to form joints at substantially the same plane position. Laminated to form an integral composite board,
The double floor structure, wherein the floor finish is fixed to the upper surface of the board cushioning material so as to straddle the adjacent composite plates.   The double floor structure according to claim 1, wherein the floor base material is a particle board, and the board buffer material is a hard gypsum board, a structural gypsum board, or a fiber-reinforced gypsum board.   The double floor structure according to claim 2, wherein the board cushioning material has a specific gravity within a range of 0.75 to 1.70.   The double floor structure according to any one of claims 1 to 3, wherein the joint is a see-through joint that forms a gap having a predetermined width between edges of the composite plate.   The see-through joint is not concealed at least partially by the floor finishing material immediately below the partition wall, and communicates the internal hollow area of the partition wall located on the floor and the underfloor space in a ventilation state. The double floor structure according to claim 4. Support the corner or edge of the floor base plate on the upper support plate of the support legs arranged on the concrete floor slab, fix the board cushioning material on the floor base plate, and finish the floor on the board cushion material In the double floor structure construction method of the floor prior construction method to further fix the material,
The floor base plate and board cushioning material having substantially the same board width and board length are integrally laminated in a state where they are aligned at the same vertical position to form an integral composite plate, and between adjacent composite plates. To form a joint joint,
A construction method for a double-floor structure, characterized in that the underfloor space between the concrete floor slab and the floor base plate communicates with the above-floor space above the composite plate by the see-through joint.   The interior partition wall is constructed on the board cushioning material at a position directly above the see-through joint, and the underfloor space is communicated with the internal hollow area of the partition wall that constitutes the above floor space. The construction method according to claim 6.

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