JP2017089246A - Dry double floor structure, construction method thereof, and connecting material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for enhancing sound insulation performance without increasing a floor height, specifically a dry double floor structure with a floor panel that has the floor panel installed stably without the adjacent floor panels contacting each other, and also provide a construction method of the dry double floor structure and a connecting material used with the dry double floor structure.SOLUTION: A dry double floor structure of the present invention includes a foundation slab, a support leg, a floor joist, a floor panel, and a connecting material. The floor joist includes at least a thin plate-form top plate, and the connecting material is installed between the adjacent floor panels. The connecting material has a housing hole for housing the support leg and a protrusion protruding toward the floor panel side. A recess is formed on an edge surface of the floor panel. A connecting space is formed by laying out the adjacent floor panels with a gap in between, and the connecting material is installed in the connecting space. Here, the protrusion of the connecting material is inserted into the recess of the floor panel.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a floor structure of a building, and more specifically to a dry double floor structure with high sound insulation performance.

  The floor structure of buildings such as single-family houses and apartment houses consists of a “straight floor” where flooring materials such as flooring are laid directly on the foundation slab (usually concrete slabs) and between the foundation slab and the floor finish. It is roughly divided into “double floors” that provide a space in the room. The direct floor can reduce the floor height, but has the disadvantage that it is difficult to maintain and renovate because the equipment piping is embedded in the foundation slab.

  On the other hand, although the double floor has a larger floor height than the direct floor, it has a sound insulation effect against lightweight floor impact sound and heavy floor impact sound. In recent years, this double floor has been adopted in many buildings including apartment buildings. Has been. The double floors are divided into “wet double floors” and “dry double floors” due to the difference in the structure type. Of these, the dry double floors can use the space on the foundation slab, so the maintenance of the equipment piping is maintained. It is also relatively easy to change pipes by renovation.

  FIG. 11 is a cross-sectional view showing a conventional wet double bed, and FIG. 12 is a cross-sectional view showing a conventional dry double bed. As shown in FIG. 11, in the conventional wet double floor, a buffer material such as glass wool is laid on a basic slab, a mortar (or concrete) layer is further provided thereon, and a floor finish directly on the mortar layer. It is the structure which installed. Wet double floors have a large floor weight and cushioning material, so they have better sound insulation performance than dry double floors. However, it requires a long time for construction because it is narrow and mortar placement and curing are performed, and the sound insulation performance deteriorates when mortar paste enters the cushioning material.

  As shown in FIG. 12, the conventional dry double floor has a vibration isolation support leg installed on the foundation slab, and a support leg base fixed to the vibration isolation support leg supports the floor base material. It is a structure with floor finishing material installed on top. The dry type double floor has a shorter construction period than the wet type double floor, but the conventional method has a drawback that the sound insulation performance is limited because the entire floor is lightweight.

  In order to improve the sound insulation performance of the dry double floor, for example, it is conceivable to increase the weight of the floor finishing material and increase its rigidity, but with this, the scale of the structure that supports the floor finishing material also increases. The floor height will also increase. Of course, as a building, it is desired to secure a large indoor space, and therefore the floor height is designed to be as small as possible. In other words, the conventional dry double floor has a limit in sound insulation performance due to the restriction of the floor height. Therefore, Patent Document 1 and Patent Document 2 propose a technique for improving the sound insulation performance even under a limited floor height condition.

JP 2011-214385 A JP 2005-282273 A

  The technique proposed in Patent Document 1 is a technique for improving the sound insulation performance by increasing the rigidity of the base material by integrating the base plate and the joist. Further, Patent Document 2 is a technique for reducing the resonance noise of the air layer by installing a vibration absorbing member (a plurality of non-woven cloths or an inclined diffusion plate) between the foundation slab and the floor finishing material. is there.

  It is known that increasing the weight of an object that blocks sound is particularly effective in improving sound insulation performance. That is, in the case of a dry double floor, increasing the weight of the entire floor structure is effective for improving the sound insulation performance. However, the techniques proposed in Patent Document 1 and Patent Document 2 are not so different from the conventional structure in terms of the weight of the entire floor structure. Therefore, even if the techniques of both documents are adopted, significant improvement in sound insulation performance cannot be expected.

  The inventors of the present application decided to improve the sound insulation performance by increasing the weight of the entire floor structure, and decided to install a floor panel in addition to the conventional structure. For example, this floor panel can utilize an extruded cement board mainly used as a wall material. By adding a floor panel such as an extruded cement board, the weight becomes larger than that of the conventional floor structure, and as a result, the sound insulation performance can be improved.

  There are several problems with installing floor panels. In order to cover the entire floor surface, multiple floor panels will be arranged in a plane, but it is unstable if simply installed, and the adjacent (opposite) floor panels are in contact with each other, so the members are missing. There is also a risk. Moreover, it is also conceivable that the floor height is increased by arranging the floor panel.

  An object of the present invention is to provide a technique for improving the sound insulation performance without increasing the floor height. In addition to providing a floor panel, adjacent floor panels are connected to each other without being in contact with each other, and are reliably stabilized. It is providing the dry double floor structure in which the floor panel was installed, the construction method of the dry double floor structure, and the connection material used for the dry double floor structure.

  The present invention was made by paying attention to the point that a floor panel such as an extruded cement board is provided in a dry double floor structure, and a connecting material for connecting and fixing the floor panel is installed. This is based on an unprecedented idea.

  The dry double floor structure of the present invention is a structure including a basic slab, support legs, joists, floor panels, and connecting materials. The support legs are installed on the foundation slab, and the joists are supported by the support legs. The joists have at least a thin plate-like top plate. A plurality of floor panels are arranged in a plane on the joists, and the connecting material is installed between adjacent floor panels. The connecting member has a receiving hole for receiving the support leg and a protrusion protruding to the floor panel side. Moreover, the recessed part is provided in the edge part surface (the side surface which opposes an adjacent floor panel among the side surfaces at the time of planar arrangement | positioning) of a floor panel. A connection space is formed by arranging adjacent floor panels with a gap, and a connecting member is installed in the connection space. At this time, the protrusion of the connecting member is inserted into the recess of the floor panel.

  The dry double floor structure of the present invention may be a structure in which a connecting material is installed between an indoor wall (inner wall) and a floor panel. In this case, a connection space is formed by arranging the floor panel with a gap between the floor and the indoor wall, and a connecting material is installed in the connection space.

  The dry double floor structure of the present invention can also be a structure using an extruded cement board as a floor panel.

  The dry double floor structure of the present invention can also be a structure using joists formed of channel steel and support leg bases. The joist is placed on a support leg pedestal fixed to the support leg, and the joist is arranged in such a posture that the support leg pedestal is accommodated in a grooved space of the joist (a region surrounded by the web and both flanges).

  The dry double floor structure of the present invention can also be a structure using a connecting material composed of an upper connecting material and a lower connecting material that are stacked one above the other. In this case, the protrusion is provided on the lower connecting member, and the lower connecting member is fixed to the support leg, so that the protrusion can be fixed so as to press the floor panel.

  The dry double floor structure of the present invention may be a structure in which an open space is formed above the accommodation hole provided in the lower connecting material. The connecting material in this case is composed of a lower connecting material and a plurality of upper connecting materials arranged on the lower connecting material, and the upper connecting material is arranged so as to provide a space above the accommodation hole. An open space is formed.

  The dry double floor structure of the present invention may be a structure further including a floor base material and a floor finish material. The floor base material is installed on the surface of a plurality of floor panels arranged in a plane, and the floor finish material is installed on the floor base material. A floor base material formed of a wood material (wood or a composite material using wood as a main material) is fixed to an upper connecting material also formed of a wood material using nails or screws.

  The construction method of the dry double floor structure of the present invention is a method comprising a basic slab construction process, a support leg installation process, a joist fixing process, a floor panel placement process, a connecting material installation process, and a floor finish material installation process. . In the foundation slab construction process, the foundation slab is constructed, and in the support leg installation process, the support legs are installed on the foundation slab. In the joist fixing step, the joist having a thin top plate is fixed to the support leg, and in the floor panel placing step, the floor panel is placed on the joist. In the connecting material installation process, a connecting material is installed between adjacent floor panels, and in the floor finishing material installation process, the floor base material and the floor finishing material are installed on the surface on which a plurality of floor panels are arranged in a plane. The connecting member has an accommodation hole for accommodating the support leg and a protrusion protruding to the floor panel side. Moreover, the recessed part is provided in the edge part surface of a floor panel. A connection space is formed by arranging adjacent floor panels with a gap, and a connecting member is installed in the connection space. At this time, the protrusion of the connecting member is inserted into the recess of the floor panel.

  The connecting material of the present invention is used for a floor structure including a foundation slab, a support leg installed on the foundation slab, a joist fixed to the support leg, and a floor panel placed on the joist. . The connecting material of the present invention is composed of an upper connecting material and a lower connecting material that are stacked one above the other. Among these, the upper connecting material is formed of a wood material, and the lower connecting material has an accommodation hole for accommodating a support leg, and a floor. Protrusions projecting to the panel side. The protrusion of the lower connecting member has a shape that can be inserted into a recess provided on the end surface of the floor panel.

The dry double floor structure, the construction method of the dry double floor structure, and the connecting material of the present invention have the following effects.
(1) The weight of the entire dry double floor structure is increased by adding the floor panel, and as a result, the sound insulation performance against the light floor impact sound and the heavy floor impact sound is improved as compared with the conventional one.
(2) Since it is a dry type, it is not necessary to place or cure concrete or mortar and can be constructed in a short construction period. In addition, it can be adopted without resistance even during renewal.
(3) By using a finished product such as an extrusion-molded cement board as a floor panel, it is possible to prevent an increase in construction labor and construction period. Further, by reducing the size of the floor panel, for example, even one person can be transported, and the work becomes easier.
(4) Since the joist has at least a thin plate-like top plate, the joist does not affect the floor height, and even if a floor panel is installed, an increase in the floor height can be suppressed.
(5) By installing a connecting material between adjacent floor panels, the floor panels can be firmly connected, and member damage due to both contact can be prevented.
(6) The projection of the connecting member is inserted into the recess of the floor panel, so that the floor panel is firmly fixed, and as a result, the joist pressed by the floor panel is stabilized without wobbling.
(7) The floor base material can be fixed with a nail or a screw by forming the connecting material as an upper connecting material and a lower connecting material, and further forming the upper connecting material from a wood material. Further, since the floor base material can be plywood or the like, the floor finishing material is not restricted and the range of selection is widened.

The fragmentary sectional view which shows the dry-type double floor structure of this invention. (A) is a step diagram showing a state in which a foundation slab and support legs are installed, (b) is a step diagram in which a joist is installed, (c) is a step diagram in which a left floor panel is installed, d) is a step diagram showing a state where the connecting material is installed, (e) is a step diagram showing a state where the right floor panel is installed, and (f) is a step diagram showing a state where the floor base material and the floor finish material are installed. . (A) is a plan view showing support legs and joists installed in a room surrounded by an inner wall, (b) is a plan view showing connecting members installed in the room, and (c) is a plane showing floor panels installed in the room. Figure. (A) is a fragmentary sectional view which shows the joist of the channel steel installed on the support leg base, (b) is a partial sectional view which shows the joist of the flat steel installed on the support leg base. (A) is sectional drawing of the floor panel using an extrusion-molded cement board, (b) is a top view which shows the floor panel installed in joist. (A) is sectional drawing which looked at the connection material in the Y-axis direction, (b) is sectional drawing which looked at the upper connection material and lower connection material installed in joist on the X-axis direction. (A) is sectional drawing which shows the connection material which provided two projection parts on both sides, (b) is sectional drawing which shows the connection material which provided one projection part on the one side, and two projection parts on the other side . The fragmentary sectional view which shows the dry type double floor structure of this invention constructed | assembled near an inner wall. The flowchart which shows the flow of the main processes of the construction method of the dry-type double floor structure of this invention. The graph which compares the sound insulation effect of the dry type double floor structure of this invention, and a conventional structure. Sectional drawing which shows the conventional wet double bed. Sectional drawing which shows the conventional dry-type double floor.

  An example of embodiments of the dry double floor structure, the dry double floor structure construction method, and the connecting material according to the present invention will be described with reference to the drawings.

1. Dry double floor structure and connecting material First, the dry double floor structure of the present invention and the connecting material used in this structure will be described. As shown in FIG. 1, the dry double floor structure of the present invention is mainly composed of a basic slab 100, a joist 200, and a floor panel 300, and a floor base material 400 and a floor finishing material 500 are installed thereon. The foundation slab 100 supports the load of the dry double floor structure, and is a board-like concrete body, for example. The joist 200 has at least a thin plate-like top plate, and is a member having a remarkably large length dimension (hereinafter, referred to as “long member”) as compared with a cross-sectional dimension. The floor panel 300 is a plate-like member, and it is preferable to use a floor panel manufactured by a factory or the like. The floor base material 400 is a board made of wooden board, plywood or particle board, and the floor finish 500 is made of flooring or carpet.

  The joist 200 is supported by support legs 600 installed on the foundation slab 100. Specifically, the support leg base 700 fixed to the support leg 600 receives and supports the joist 200. The floor panel 300 is supported by the joists 200, and the floor panel 300 supports the floor base material 400 and the floor finishing material 500. Further, both are arranged so that a gap (hereinafter referred to as “connection space”) is provided between the adjacent floor panel 300a (left side in FIG. 1) and the floor panel 300b (right side in FIG. 1). The connecting member 800 is installed. The connecting member 800 shown in FIG. 1 has a two-stage structure of an upper connecting member 810 and a lower connecting member 820. However, as will be described later, the connecting member 800 may be an integrated type that does not separate vertically.

  Hereinafter, main elements constituting the dry double floor structure of the present invention will be described in detail along the order of installation.

  FIG. 2 is a step diagram showing the order of constructing the dry double floor structure of the present invention, where (a) shows a state in which a foundation slab 100 and support legs 600 are installed, and (b) shows a state in which joists 200 are installed, (C) is the state where the left floor panel 300a is installed, (d) is the state where the connecting member 800 is installed, (e) is the state where the right floor panel 300b is installed, and (f) is the floor base material 400 and the floor. The state which installed the finishing material 500 is each shown.

(Basic slab and support legs)
As shown to Fig.2 (a), the foundation slab 100 is first constructed by cast-in-place concrete etc., and the support leg 600 is installed on it. The support legs 600 are prepared in a number corresponding to the target floor area, and are arranged at predetermined intervals. FIGS. 3A and 3B are plan views showing in stages a dry double floor structure built in a room surrounded by the inner wall 900, where FIG. 3A shows a state where the support legs 600 and joists 200 are installed, and FIG. A state in which the material 800 is installed, and (c) shows a state in which the floor panel 300 is installed. As shown in FIG. 3, for the sake of convenience, two orthogonal axes are arranged in the room, one of which is the X axis (left and right in the figure), and the other axis orthogonal to the X axis is the Y axis (up and down in the figure). In this figure, six support legs 600 are arranged at intervals in the X-axis direction, and seven rows of these six support legs 600 are arranged at intervals in the Y-axis direction.

  In order to further improve the sound insulation performance of the dry double floor structure of the present invention, it is desirable that the support leg 600 be an anti-vibration support leg. As shown in FIG. 2A, the anti-vibration support leg mainly includes a pedestal 610 and a support column 620 erected on the pedestal 610. The pedestal 610 is formed of a vibration-proof member such as a vibration-proof rubber. Further, a stopper 630 including a hollow cylindrical main body and a flange protruding outward is attached to the middle stage of the support column 620. The support leg base 700 is fixed to the stopper 630 by embedding the stopper 630 therein. In addition, a convex screw (so-called “male screw”) is provided on the outer periphery of the support column 620, a “plus (+) groove” or a “minus (−) groove” is provided on the top, and further inside the main body of the stopper 630. When a concave screw (so-called “female screw”) is provided, the support leg base 700 can be moved up and down by inserting a driver or the like into the plus groove (minus groove) and turning it, that is, adjusting the height of the support leg base 700. Is possible and more suitable. By adjusting the height of each support leg base 700, the joist 200 and the floor panel 300 can be installed horizontally. The support leg pedestal 700 may be made of wood or a composite material mainly made of wood (hereinafter referred to as “woody material”).

(Jota)
When a predetermined number of support legs 600 are installed at predetermined positions, the joists 200 are installed on the support leg base 700 as shown in FIG. The joist 200 is a long member as described above, and a plurality of joists 200 are arranged in the X-axis direction shown in FIG. Further, the joists 200 supported on the support legs 600 are naturally arranged in accordance with the positions where the support legs 600 are arranged. For example, in FIG. 3A, seven rows of joists 200 are installed in accordance with the support legs 600. The

  FIG. 4 is a partial cross-sectional view showing the joist 200 installed on the support leg pedestal 700, where (a) shows the joist 200 made of channel steel, and (b) shows the joist 200 made of flat steel. For example, as shown in FIG. 4A, the joist 200 can use a groove steel made of a top plate 210 (web) and two side plates 220 (flange). Then, the joist so as to accommodate the supporting leg base 700 in the area surrounded by the top plate 210 and the two side plates 220 (the area indicated by the broken line in FIG. 4A and hereinafter referred to as “groove-shaped space”). 200 is arranged. That is, the joists 200 are installed in such a posture that the inner side surface (back surface) of the top plate 210 is in contact with the upper surface of the support leg base 700. By installing the joist 200 in such a posture, an increase in the floor height due to the joist 200 is eliminated (strictly, the increase in the floor height is limited to the thickness of the top plate 210).

  The joist 200 is for placing the floor panel 300. Therefore, if the floor panel 300 can be supported, the joist 200 can be a flat bar joist 200 as shown in FIG. However, since flat steel is structurally fragile compared to channel steel, it is advisable to determine the cases that can be adopted after careful consideration of the loading load. The joist 200 may be made of steel such as grooved steel or flat steel, but may also be made of synthetic resin or woody material. Become.

(Floor panel)
When the joist 200 is installed on the support leg base 700, the floor panel 300 is installed on the joist 200 and the connecting member 800 is installed between the adjacent floor panels 300. Since the size of one floor panel 300 is sufficiently small with respect to the target floor area, a plurality of (30 in the figure) floor panels 300 are prepared as shown in FIG. It is arranged in a plane so as to spread.

  FIG. 5 is a diagram showing details of the floor panel 300 using an extruded cement board, where (a) is a sectional view of the floor panel 300, and (b) is a plane showing the floor panel 300 installed on the joist 200. FIG. In order to further improve the sound insulation performance of the dry double floor structure of the present invention, it is effective to increase the weight of the entire structure as described above. Therefore, the floor panel 300 also has a considerable weight such as an extruded cement board. Is suitable. Of course, it is not limited to an extruded cement board, and a precast concrete board, a steel board, or a board made of a synthetic resin or a wood material may be used depending on the situation.

  As shown in FIG. 5 (a), an extruded cement board generally has a hexahedron (cuboid) shape having a cavity 310 inside and a significantly larger upper and lower surface than the other surface. And when using it for the dry double floor structure of this invention, the side surface (henceforth "end part surface") which opposes the adjacent floor panel 300 among the four side surfaces (surface except an up-and-down surface) of the floor panel 300. Is provided with a recess 320. In the floor panel 300 shown in FIG. 5 (a), the left and right side surfaces are end surfaces, and concave portions 320 are provided on these surfaces.

  As shown in FIG. 5B, the floor panel 300 is bridged between two joists 200 (upper and lower joists 200 in the figure), and is a side surface that is not an end surface of the four side surfaces (hereinafter referred to as “locking surface”). The end portion on the side is placed on the joist 200. In other words, the floor panel 300 is supported by the ends of the floor panel 300 on the locking surfaces on both sides being locked on the joists 200. At this time, it arrange | positions so that a clearance gap may be provided between the adjacent floor panels 300 (between opposing end surface) so that a connection space may be formed.

(Connecting material)
As shown in FIG. 3B, the connecting member 800 is a long member similar to the joist 200, and is arranged in a direction (Y-axis direction) orthogonal to the arrangement direction (X-axis direction) of the joist 200. As can be seen from FIG. 1, the support leg 600 is installed at a position where the joist 200 and the connecting member 800 intersect in FIG.

  6A and 6B are diagrams for explaining the connecting member 800, where FIG. 6A is a cross-sectional view of the connecting member 800, and FIG. 6B is a cross-sectional view illustrating the upper connecting member 810 and the lower connecting member 820 installed on the joists 200. FIG. 6A is a cross-sectional view as viewed in the Y-axis direction of FIG. 3, and FIG. 6B is a cross-sectional view as viewed in the X-axis direction of FIG.

  As shown in FIG. 6A, the connecting member 800 can have a two-stage configuration including an upper connecting member 810 and a lower connecting member 820. Of these, the lower connecting member 820 is provided with a receiving hole 830 that can receive the support leg 600 (particularly, the support column 620), and further has a protrusion 840 on the side surface. As shown in FIG. 1, the support column 620 of the support leg 600 is inserted from below until it passes through the accommodation hole 830, and is tightened by the bearing plate and the nut on the upper surface of the lower connecting member 820. That is, the lower connecting member 820 is firmly fixed by being sandwiched between the bearing plate and the nut from the upper surface side and the joist 200 from the lower surface side. Therefore, the bearing plate needs to have a shape slightly larger than the cross section of the accommodation hole 830.

  As described above, the connecting member 800 is installed in a connection space formed between adjacent floor panels 300. In the connection space, both end surfaces of the adjacent floor panels 300 face each other, that is, the concave portions 320 provided on the end surfaces face each other. When the connecting member 800 is installed in the connection space, the projection 840 is inserted into the recess 320. FIG. 1 also shows a state in which the connecting member 800 is installed in the connection space, and the protrusions 840 provided on the left and right sides of the connecting member 800 are inserted into the recesses 320 of the floor panel 300 adjacent to the left and right. Accordingly, the protruding portion 840 has a shape that protrudes toward the floor panel 300 and can be inserted into the recess 320. Furthermore, the protrusion 840 may be provided at a position where the lower surface of the protrusion 840 comes into contact with a partial surface (horizontal plane) of the recess 320 when the protrusion 840 is inserted into the recess 320. As a result, when the upper surface of the lower connecting member 820 is tightened by the bearing plate and the nut, the projection 840 presses the recess 320, and as a result, the connecting member 800 connects the floor panels 300 adjacent to the left and right, It can be firmly fixed.

  In order to install the connecting member 800 in the connection space while inserting the protrusion 840 into the recess 320, first, the left floor panel 300a is placed on the joist 200 as shown in FIG. Next, as shown in FIG. 2D, the lower connecting member 820 is installed in the connection space while the left protrusion 840 is inserted into the recess 320 of the left floor panel 300a, and tightened with a bearing plate and a nut. At this time, since there is no upper connecting member 810, the upper portion of the lower connecting member 820 is opened, and the work of tightening the upper surface of the lower connecting member 820 with a bearing plate and a nut becomes extremely easy. Then, as shown in FIG. 2E, the right floor panel 300b is installed so that the right protrusion 840 is inserted into the recess 320 of the right floor panel 300b, and then the upper portion above the lower connecting member 820. A connecting member 810 is installed. Depending on the situation of the site, the left and right floor panels 300 can be installed after the connecting material 800 is installed first, and depending on the shape of the connecting material 800, the left and right floor panels 300 are installed and then the connecting material. 800 can also be installed.

  The upper connecting member 810 shown in FIGS. 1 and 2 is provided with a cavity for accommodating the head of the support leg 600 (particularly, the support column 620), but forms an open space shown in FIG. 6B. By doing so, this cavity can be omitted. This open space will be described below. In FIG. 3B, six rows of connecting members 800 are arranged in the X-axis direction, but the upper connecting members 810 constituting one row of the connecting members 800 are divided into a plurality. Then, the divided upper connecting members 810 are arranged on the lower connecting member 820, but as shown in FIG. 6B, only the portions where the support legs 600 are installed are arranged so as to provide voids. As a result, only the lower connecting member 820 is disposed at the place where the support leg 600 is installed, and an open space is formed in the upper part. As a result, the head portion of the support leg 600 can be accommodated without providing a cavity in the upper connecting member 810, and the support plate and nut can be tightened later for adjustment. In addition, when one row of connecting members 800 shown in FIG. 3B is sufficiently long, the lower connecting member 820 may be divided into a plurality of parts.

  Although the connecting member 800 described so far has provided the protruding portions 840 on the left and right, various connecting members 800 such as two protruding portions 840 on one side can be used. 7A and 7B are cross-sectional views showing various connecting members 800, wherein FIG. 7A shows a connecting member 800 provided with two protrusions 840 on both sides, and FIG. 7B shows one protrusion 840 on one side. Each of the connecting members 800 provided with two protrusions 840 on the other side is shown. Note that both FIG. 7A and FIG. 7B show an integrated connecting member 800 that is not divided into upper and lower parts.

  When two protrusions 840 are provided on each of the left and right sides as in the connecting member 800 shown in FIG. 7A, the recesses 320 are formed at two upper and lower portions on the end surface of the floor panel 300a disposed on the left side. Are provided on the right side of the floor panel 300b arranged on the right side. As a result, the four left and right projections 840 are inserted into the recesses 320, respectively. On the other hand, when the upper and lower two protrusions 840 are provided on the left side and one protrusion 840 is provided on the right side as in the connecting member 800 shown in FIG. 7B, the floor panel 300a disposed on the left side is provided. Concave portions 320 are provided at two upper and lower portions on the end surface of the floor portion, and only one concave portion 320 is provided at the middle portion on the end portion surface of the floor panel 300b disposed on the right side. As a result, the three left and right projections 840 are inserted into the recesses 320, respectively.

(Floor base material and floor finish material)
When the floor panel 300 and the connecting member 800 are installed, as shown in FIG. 2 (f), the floor base material 400 is laid on the floor panel 300, and the floor finishing material 500 is further installed on the upper surface of the floor base material 400. Is done. At this time, if the floor base material 400 is made of a woody material such as plywood, there is no restriction on the installation of the floor finishing material 500, and as a result, the width of the floor finishing material 500 that can be selected widens and becomes suitable. In this case, the floor base material 400 can be fixed by hitting with a nail or a screw. However, if the floor panel 300 is an extruded cement board, it is difficult to fix it with a nail or a screw. Therefore, an upper connecting member 810 made of a wood material is used. That is, since the upper connecting material 810 and the floor base material 400 are both made of a wood material, the floor base material 400 is hit with a nail or a screw at a location overlapping the upper connecting material 810.

(Inner wall side structure)
So far, the case where the connecting member 800 is installed in the connection space formed between the adjacent floor panels 300 has been described. However, the dry double floor structure of the present invention has a structure between the inner wall 900 and the floor panel 300. It is also possible to adopt a structure in which the connecting member 800 is installed in the connection space formed in the above. As shown in FIG. 3B and FIG. 3C, a connection space is formed between the floor panel 300 that is installed closest to the inner wall 900 and the inner wall 900 that the floor panel 300 faces. Thus, the floor panel 300 is arranged, and the connecting member 800 is installed in this connection space. In this case, some of the connecting members 800 (the uppermost row and the lowermost row shown in FIG. 3C) are arranged substantially parallel (including in parallel) with the joists 200.

  FIG. 8 is a partial cross-sectional view showing the dry double floor structure of the present invention constructed near the inner wall 900. As shown in this figure, of the side surfaces of the floor panel 300, the side surface facing the inner wall 900 is an end surface, and a recess 320 is provided on this end surface. A connection space is formed between the end surface of the floor panel 300 and the inner wall 900, the connecting member 800 is installed in the connection space, and the protrusion 840 is inserted into the recess 320.

2. Next, the construction method of the dry double floor structure of the present invention will be described. In addition, the construction method of the dry double floor structure of the present invention is a method of constructing the dry double floor structure described so far, and therefore, the contents overlapping with “1. Dry double floor structure and connecting material”. Only the contents specific to the construction method of the dry double floor structure will be explained. That is, the contents not described here are the same as those described in “1. Dry double floor structure and connecting material”.

  FIG. 9 is a flowchart showing the flow of the main steps of the construction method of the dry double floor structure of the present invention. The construction method of the dry double floor structure of the present invention will be described with reference to this figure. First, the foundation slab 100 is constructed by cast-in-place concrete or the like (Step 10: foundation slab construction process). Next, a plurality of support legs 600 are installed on the foundation slab 100 in a predetermined arrangement (Step 20: support leg installation process). After the support leg 600 is installed, the joist 200 is fixed so as to be supported by the support leg 600 (Step 30: joist fixing process). At this time, the joist 200 is placed on the upper surface of the support leg base 700 attached to the support leg 600, and the joist 200 is fixed by tightening the upper surface of the lower connecting member 820 installed on the joist 200 with a bearing plate and a nut. Good.

  When the joist 200 can be fixed, the floor panel 300 is placed on the joist 200 (Step 40: floor panel placing step), and the connecting member 800 is placed between the adjacent floor panels 300 (connection space) (Step 50: Connecting material installation process). At this time, as shown in FIG. 2, after connecting one (for example, the left side) floor panel 300a, the connecting member 800 may be installed, and then the other (for example, the right side) floor panel 300b may be mounted. Finally, the floor base material 400 is placed on the floor panel 300 laid out, and the floor base material 400 is hit with a nail or a screw at a place where the floor base material 400 overlaps with the upper connecting member 810 made of a wooden material. Then, the floor finishing material 500 is laid on the upper surface of the floor base material 400 (Step 60: floor finishing material installation step), and the process is completed.

3. Experimental Results Hereinafter, experimental results conducted by the inventors of the present application in order to confirm the effects of the present invention will be described.

  FIG. 10 is a graph comparing the sound insulation effect of the dry double floor structure of the present invention and the conventional structure, and shows the reduction amount for the light floor impact sound and the heavy floor impact sound, respectively. As can be seen from this figure, when the dry double floor structure of the present invention is used, both the lightweight floor impact sound and the heavy floor impact sound are reduced by two ranks compared to the conventional structure. That is, it can be understood that the dry double floor structure of the present invention can effectively insulate against various noises.

  The "dry double floor structure, dry double floor structure construction method and connecting material" of the present invention can be used in apartment buildings such as condominiums, detached houses, office buildings, school buildings, warehouses, etc. Can be used in any building. This is especially effective for buildings where noise is an obstacle, such as broadcasting facilities, movie theaters, and concert halls.

DESCRIPTION OF SYMBOLS 100 Foundation slab 200 joist 210 (joist) top plate 220 (joist) side plate 300 floor panel 310 (floor panel) cavity 320 (floor panel) recessed part 400 floor base material 500 floor finishing material 600 support leg 610 (support leg) ) Base 620 (support leg) support column 630 (support leg) stopper 700 support leg pedestal 800 connecting material 810 (composing the connecting material) upper connecting material 820 (composing the connecting material) lower connecting material 830 (connecting material) Accommodation hole 840 (connection material) protrusion 900 inner wall

Claims (9)

Basic slab,
A support leg installed on the foundation slab;
A joist supported by the support leg and having a top plate;
A plurality of floor panels arranged in a plane on the joists;
A connecting material installed between the adjacent floor panels,
The connecting member has a receiving hole for receiving the support leg, and a protrusion protruding to the floor panel side,
By connecting the adjacent floor panels with a gap, a connection space is formed,
The end surface of the floor panel facing the adjacent floor panel is provided with a recess,
The dry double floor structure, wherein the protrusion is inserted into the recess and the connecting member is installed in the connection space. In the floor structure installed in the area surrounded by the inner wall,
Basic slab,
A support leg installed on the foundation slab;
A joist supported by the support leg and having a top plate;
A plurality of floor panels arranged on the joist plane;
A connecting member installed between the floor panel and the inner wall,
The connecting member has a receiving hole for receiving the support leg, and a protrusion protruding to the floor panel side,
By connecting the floor panel with a gap between the inner wall, a connection space is formed,
The end surface of the floor panel facing the inner wall is provided with a recess,
The dry double floor structure, wherein the protrusion is inserted into the recess and the connecting member is installed in the connection space.   The dry double floor structure according to claim 1 or 2, wherein the floor panel is an extruded cement board. The joist is formed of channel steel and is placed on a support leg base fixed to the support leg,
The dry double floor structure according to any one of claims 1 to 3, wherein the joists are arranged in such a posture that the support leg pedestals are accommodated in the joist groove-shaped spaces. The connecting material is composed of an upper connecting material and a lower connecting material that are stacked one above the other.
The protrusion is provided on the lower connecting member;
The dry double floor structure according to any one of claims 1 to 4, wherein the projection is fixed to the floor panel by fixing the lower connecting member to the support leg. The connecting material is composed of the lower connecting material and a plurality of the upper connecting materials arranged on the lower connecting material,
The open space is formed above the accommodation hole by disposing the upper connection material so as to provide a void above the accommodation hole provided in the lower connection material. Item 6. The dry double floor structure according to Item 5. A floor base material installed on the surface of the plurality of floor panels arranged in a plane;
A floor finishing material installed on the floor base material,
The floor base material and the upper connecting material are formed of a wood material,
The dry double floor structure according to claim 5 or 6, wherein the floor base material is fixed to the upper connecting member by a nail or a screw. Basic slab construction process to construct the basic slab,
A support leg installation step of installing support legs on the foundation slab;
A joist fixing step of fixing a joist having a top plate to the support leg;
A floor panel placement step of placing a floor panel on the joists;
A connecting material installation step of installing a connecting material between the adjacent floor panels;
A floor finishing material installation step of installing a floor base material and a floor finishing material on a surface on which a plurality of the floor panels are arranged in a plane; and
The connecting member has a receiving hole for receiving the support leg, and a protrusion protruding to the floor panel side,
By connecting the adjacent floor panels with a gap, a connection space is formed,
The end surface of the floor panel facing the adjacent floor panel is provided with a recess,
In the connecting material installation step, the projecting portion is inserted into the recess, and the connecting material is installed in the connection space. In a floor structure comprising a foundation slab, a support leg installed on the foundation slab, a joist fixed to the support leg, and a floor panel placed on the joist, the adjacent floor panels A connecting material installed between
It consists of an upper connecting material and a lower connecting material that are stacked one above the other.
The lower connecting member has a receiving hole for receiving the support leg, and a protruding portion protruding toward the floor panel,
The upper connecting material is formed of a wood material,
The said projection part is a shape which can be inserted in the recessed part provided in the edge part surface of the said floor panel, The connection material characterized by the above-mentioned.

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