JP6679135B2 - Dry double floor structure, construction method of dry double floor structure, and connecting material - Google Patents

Description

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

  The floor structure of buildings such as detached houses and condominiums is "straight floor" where floor finishing materials such as flooring are laid directly on the foundation slab (usually concrete slab) and between the foundation slab and the floor finishing material. It is roughly divided into "double floors" that create a space in. Although the floor height of the straight floor can be reduced, it is difficult to maintain and remodel because the equipment pipe is buried in the foundation slab.

  The double floor, on the other hand, has a higher floor height than the straight floor, but it has a sound insulation effect against light floor impact sound and heavy floor impact sound.In recent years, this double floor has been adopted in many buildings including apartment houses. Has been done. Also, the double floors are divided into "wet double floors" and "dry double floors" due to the difference in their structural types. Of these, the dry double floors can maintain the facility piping because the space above the foundation slab can be used. It is also relatively easy to change the piping by remodeling.

  FIG. 11 is a sectional view showing a conventional wet double bed, and FIG. 12 is a sectional view showing a conventional dry double bed. As shown in FIG. 11, in the conventional wet double floor, a cushioning material such as glass wool is laid on a foundation slab, and a mortar (or concrete) layer is further provided thereon, and a floor finishing material is directly provided on the mortar layer. It is the structure that installed. Wet double floors have higher sound insulation performance than dry double floors because the weight of the entire floor is large and a cushioning material is laid, but since it is installed directly on the mortar layer, the range of floor finishing materials can be selected. However, there is a problem that the sound insulation performance is deteriorated because the construction requires a long time because the mortar is cast and cured, and the mortar slag and the like enter the cushioning material.

  As shown in FIG. 12, in the conventional dry type double floor, the vibration-proof support legs are installed on the foundation slab, and the support leg pedestals fixed to the vibration-proof support legs support the floor base material. It is a structure with a floor finish installed on top. The dry type double floor has a shorter construction period than the wet type double floor, but the conventional type has a drawback that the sound insulating performance is limited because the entire floor is lightweight.

  In order to improve the sound insulation performance of the dry type double floor, for example, it is conceivable to increase the weight of the floor finishing material and increase its rigidity, but the scale of the structure that supports the floor finishing material also increases accordingly. The floor height also increases. Of course, it is desirable for the building 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 limited sound insulation performance due to the limited floor height. Therefore, Patent Documents 1 and 2 propose a technique for improving the sound insulation performance even under the condition of a limited floor height.

JP, 2011-214385, A JP 2005-28273 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 joists. Further, Patent Document 2 is a technique for reducing resonance noise of an air layer by installing a vibration absorbing member (a plurality of non-laying cloths or a diffusion plate provided at an inclination) between a base slab and a floor finishing material. is there.

  It is known that increasing the weight of an object that blocks sound is particularly effective in improving the sound insulating performance. That is, in the case of a dry type double floor, increasing the weight of the entire floor structure is effective for improving the sound insulation performance. However, the technologies proposed in Patent Documents 1 and 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 that is mainly used as a wall material. The addition of floor panels, such as extruded cement boards, makes them heavier than conventional floor structures and, as a result, can improve sound insulation.

  There are some problems with installing floor panels. In order to cover the entire floor surface, multiple floor panels are arranged in a plane, but it is unstable if simply installed, and adjacent (opposing) floor panels are in contact with each other, resulting in loss of members. There is also a risk of In addition, it is possible that the floor height increases by arranging the floor panel.

  An object of the present invention is to provide a technique for enhancing sound insulation performance without increasing the floor height, providing a floor panel, and connecting adjacent floor panels without contacting each other, and reliably ensuring stability. The present invention is to provide a dry double floor structure having a floor panel installed therein, a method for constructing the dry double floor structure, and a connecting member used in the dry double floor structure.

  The present invention has been made by paying attention to the point that a floor panel such as an extrusion-molded cement board is provided in a dry double floor structure, and a connecting member for connecting the floor panels and for stably fixing the floor panel is installed. It was based on an unprecedented idea.

  The dry double floor structure of the present invention is a structure including a foundation slab, support legs, joists, floor panels, and connecting members. 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 top plate. A plurality of floor panels are arranged in a plane on the joists, and the connecting member is installed between the adjacent floor panels. This connecting member has an accommodation hole for accommodating the support leg and a protrusion protruding toward the floor panel. Further, a concave portion is provided on an end surface of the floor panel (a side surface facing the adjacent floor panel among the side surfaces when arranged in a plane). A connection space is formed by arranging adjacent floor panels with a gap therebetween, and the connecting material is installed in this 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 have a structure in which a connecting member is installed between the indoor wall (inner wall) and the floor panel. In this case, the floor panel is arranged with a gap between the floor panel and the indoor wall to form a connection space, and the connecting material is installed in the connection space.

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

  The dry double floor structure of the present invention may be a structure using a joist made of channel steel and a support leg pedestal. The joist is placed on a support leg pedestal fixed to the support leg, and the joist is placed in such a posture that the support leg pedestal is accommodated in the groove-shaped space (the area surrounded by the web and both flanges) of the joist.

  The dry double floor structure of the present invention can also be a structure using a connecting member composed of an upper connecting member and a lower connecting member which are vertically stacked. 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 have a structure in which an open space is formed above the accommodation hole provided in the lower connecting member. The connecting member in this case is composed of a lower connecting member and a plurality of upper connecting members arranged on the lower connecting member, and the upper connecting member 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 finishing material. The floor base material is installed on the surfaces 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 containing wood as a main raw material) is fixed to an upper connecting member formed of the wood material by using a nail or a screw.

  The dry double floor structure construction method of the present invention is a method including a basic slab construction step, a support leg installation step, a joist fixing step, a floor panel mounting step, a connecting material installation step, and a floor finishing material installation step. . In the basic slab construction process, the basic slab is constructed, and in the support leg installation process, the support legs are installed on the basic slab. In the joist fixing step, joists having a thin top plate are fixed to the support legs, and in the floor panel placing step, the floor panel is placed on the joists. In the connecting material installation step, the connecting material is installed between the adjacent floor panels, and in the floor finishing material installation step, the floor base material and the floor finishing material are installed on the surface on which the plurality of floor panels are arranged in a plane. The connecting member has a housing hole for housing the support leg, and a protrusion protruding toward the floor panel. A recess is provided on the end surface of the floor panel. A connection space is formed by arranging adjacent floor panels with a gap therebetween, and the connecting material is installed in this connection space. At this time, the protrusion of the connecting member is inserted into the recess of the floor panel.

  INDUSTRIAL APPLICABILITY The connecting material of the present invention is used for a floor structure including a foundation slab, a supporting leg installed on the foundation slab, a joist fixed to the supporting leg, and a floor panel placed on the joist. . The connecting member of the present invention is composed of an upper connecting member and a lower connecting member which are vertically stacked, of which the upper connecting member is made of a wood material, and the lower connecting member has an accommodation hole for accommodating the supporting legs and a floor. It has a protrusion protruding to the panel side. The protrusion of the lower connecting member has a shape that can be inserted into a recess provided in the end surface of the floor panel.

The dry double floor structure, the method for constructing the dry double floor structure, and the connecting member 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 weight floor impact sound and the heavy floor impact sound is improved as compared with the conventional case.
(2) Since it is a dry type, there is no need for casting or curing of concrete or mortar, and construction can be done in a short construction period. In addition, it can be adopted without resistance even after 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 carry it and the work becomes easier.
(4) Since the joists have at least a thin top plate, the joists do not affect the floor height, and even if a floor panel is installed, it is possible to suppress an increase in floor height.
(5) By installing the connecting material between the adjacent floor panels, the floor panels can be firmly connected, and member damage due to contact between both can be prevented.
(6) The protrusion 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 joists held by the floor panel do not wobble and are stable.
(7) The floor base material can be fixed with nails or screws by forming the connecting material of the upper connecting material and the lower connecting material and forming the upper connecting material of the wood material. Furthermore, since the floor base material can be plywood or the like, there are no restrictions on the floor finish material, and the range of choice is widened.

The fragmentary sectional view showing the dry double floor structure of the invention in this application. (A) is a step diagram showing a state in which a foundation slab and supporting legs are installed, (b) is a step diagram showing a state in which joists are installed, (c) is a step diagram showing a state in which a floor panel on the left side is installed, ( d) is a step diagram showing a state in which a connecting material is installed, (e) is a step diagram showing a state in which the right floor panel is installed, and (f) is a step diagram showing a state in which a floor base material and a floor finishing material are installed. . (A) is a plan view showing supporting legs and joists installed in the room surrounded by the inner wall, (b) is a plan view showing a connecting member installed in the room, (c) is a plan view showing a floor panel installed in the room Fig. (A) is a partial sectional view showing a joist of the channel steel installed on the support leg pedestal, and (b) is a partial sectional view showing a joist of the flat steel installed on the support leg pedestal. (A) is sectional drawing of the floor panel which used the extrusion molding cement board, (b) is a top view which shows the floor panel installed on the joist. (A) is a cross-sectional view of the connecting member viewed in the Y-axis direction, and (b) is a cross-sectional view of the upper connecting member and the lower connecting member installed on the joist in the X-axis direction. (A) is a cross-sectional view showing a connecting member provided with two protrusions on each side, and (b) is a cross-sectional view showing a connecting member having one protrusion on one side and two protrusions on the other side. . The partial cross section figure which shows the dry-type double floor structure of this invention built 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 figure which compares the sound insulation effect of the dry type double floor structure of this invention, and the conventional structure. Sectional drawing which shows the conventional wet double floor. Sectional drawing which shows the conventional dry type double floor.

  An example of an embodiment of a dry double floor structure, a method of constructing a dry double floor structure, and a connecting member of 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 foundation slab 100, joists 200, and a floor panel 300, and a floor base material 400 and a floor finishing material 500 are installed on the upper part thereof. The foundation slab 100 supports the load of the dry double floor structure, and is, for example, a board-shaped concrete body. The joist 200 has at least a thin plate-like top plate, and is a member whose length dimension is significantly larger than its cross-sectional dimension (hereinafter referred to as “long member”). Further, the floor panel 300 is a plate-shaped member, and it is preferable to use one manufactured in a factory or the like. The floor base material 400 is a plate material made of wooden board, plywood, or particle board, and flooring material 500 is made of flooring, carpet, or the like.

  The joist 200 is supported by the support leg 600 installed on the foundation slab 100. Specifically, the support leg pedestal 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, the floor panel 300a (left side in FIG. 1) and the floor panel 300b (right side in FIG. 1) are arranged such that a gap (hereinafter, referred to as “connection space”) is provided between the floor panel 300a (left side in FIG. 1) and the connection space. The connecting member 800 is installed in the. 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, but it may be an integrated type that is not vertically separated as described later.

  Hereinafter, the main elements constituting the dry double floor structure of the present invention will be described in detail in 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) is a state in which the foundation slab 100 and supporting legs 600 are installed, (b) is a state in which joists 200 are installed, (C) is a state in which the left floor panel 300a is installed, (d) is a state in which the connecting member 800 is installed, (e) is a state in which the right floor panel 300b is installed, (f) is the floor base material 400 and the floor The state where the finishing material 500 is installed is shown.

(Basic slab and supporting legs)
As shown in FIG. 2A, first, the foundation slab 100 is constructed with cast-in-place concrete or the like, and the support legs 600 are installed on it. The support legs 600 are prepared in a number corresponding to the floor area of interest, and are arranged at predetermined intervals. FIG. 3 is a plan view showing a dry double floor structure constructed in a room surrounded by an inner wall 900 in a stepwise manner. FIG. 3A shows a state in which a support leg 600 and a joist 200 are installed, and FIG. The material 800 is installed, and (c) shows the floor panel 300 installed. Note that, as shown in FIG. 3, two axes that are orthogonal to each other are arranged in the room for convenience, one of them is referred to as an X axis (horizontal direction in the drawing), and an axis orthogonal to the X axis is referred to as a Y axis (vertical direction in the drawing). In this figure, six support legs 600 are arranged at intervals in the X-axis direction, and six rows of the support legs 600 are arranged in seven columns 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 a vibration-proof support leg. As shown in FIG. 2A, the anti-vibration support leg is mainly composed of a pedestal 610 and a support column 620 erected on the pedestal 610. This pedestal 610 is formed of a vibration-proof member such as a vibration-proof rubber. 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. By embedding the stopper 630 therein, the support leg pedestal 700 is fixed to the stopper 630. 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. If a concave screw (so-called “female screw”) is provided, the support leg pedestal 700 can be moved up and down by inserting a screwdriver or the like into the plus groove (minus groove) and turning it, that is, adjusting the height of the support leg pedestal 700. It becomes possible and more suitable. By adjusting the height of each support leg pedestal 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 mixture of wood as a main raw material (hereinafter referred to as “wood material”).

(Joist)
When a predetermined number of support legs 600 are installed at predetermined positions, joists 200 are installed on the support leg pedestals 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 according to 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. It

  4A and 4B are partial cross-sectional views showing a joist 200 installed on the support leg pedestal 700. FIG. 4A shows a joist 200 of channel steel, and FIG. 4B shows a joist 200 of flat steel. For example, the joist 200 may be a channel steel made up of a top plate 210 (web) and two side plates 220 (flange) as shown in FIG. 4A. Then, a joist is provided to accommodate the support leg pedestal 700 in an area surrounded by the top plate 210 and the two side plates 220 (an area indicated by a broken line in FIG. 4A, hereinafter referred to as “groove space”). Place 200. That is, the joist 200 is installed in a posture in which the inner surface (back surface) of the top plate 210 is in contact with the upper surface of the support leg pedestal 700. By installing the joist 200 in such a posture, the increase in floor height due to the joist 200 is eliminated (strictly speaking, the increase in floor height is limited to the thickness of the top plate 210).

  The joist 200 mounts the floor panel 300. Therefore, if the joist 200 can support the floor panel 300, the joist 200 of flat steel (flat bar) can be used as shown in FIG. 4B. However, since flat steel is structurally weaker than channel steel, it is advisable to carefully consider cases such as overloading to determine the cases that can be adopted. Note that the joist 200 may be made of a steel material such as a channel steel or a flat steel, and may be made of a synthetic resin or a wood material. In this case as well, it is necessary to carefully consider the overload and the like before use. Become.

(Floor panel)
When the joist 200 is installed on the support leg pedestal 700, the floor panel 300 is installed on the joist 200 and the connecting material 800 is installed between the adjacent floor panels 300. Since the size of one floor panel 300 is sufficiently smaller than the target floor area, a plurality (30 in the figure) of floor panels 300 are prepared as shown in FIG. Are laid out in a plane so that

  5: is a figure which shows the detail of the floor panel 300 which used the extrusion molded cement board, (a) is sectional drawing of the floor panel 300, (b) is the plane which shows the floor panel 300 installed on the joist 200. FIG. It is a figure. In order to further improve the sound insulation performance of the dry type 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, not only the extruded cement board, but also a precast concrete board, a steel board, or a board made of synthetic resin or wood material can be adopted depending on the situation.

  As shown in FIG. 5 (a), the extrusion-molded cement board generally has a hexahedron (a rectangular parallelepiped) shape having a cavity 310 inside and the upper and lower surfaces being significantly wider than the other surface. When used in the dry double floor structure of the present invention, of the four side surfaces (surfaces excluding the upper and lower surfaces) of the floor panel 300, the side surface facing the adjacent floor panel 300 (hereinafter, referred to as "end surface"). A recess 320 is provided in the. In the floor panel 300 shown in FIG. 5A, the left and right side surfaces are end surfaces, and the recesses 320 are provided on this surface.

  As shown in FIG. 5 (b), the floor panel 300 is bridged between two joists 200 (upper and lower joists 200 in the figure), and one of the four side surfaces that is not an end surface (hereinafter referred to as a “locking surface”). ) Side end is placed on the joist 200. In other words, the floor panel 300 is supported by locking the ends of the floor panel 300 on both sides of the locking surface on the joist 200. At this time, a space is provided between adjacent floor panels 300 (between facing end faces) so that a connection space is 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 views for explaining the connecting member 800, in which FIG. 6A is a sectional view of the connecting member 800, and FIG. 6B is a sectional view showing the upper connecting member 810 and the lower connecting member 820 installed on the joist 200. It is a figure. Note that FIG. 6A is a cross-sectional view seen in the Y-axis direction of FIG. 3, and FIG. 6B is a cross-sectional view seen in the X-axis direction of FIG.

  As shown in FIG. 6A, the connecting member 800 may have a two-tier structure including an upper connecting member 810 and a lower connecting member 820. Of these, the lower connecting member 820 is provided with an accommodation hole 830 capable of accommodating the support leg 600 (in particular, the support column 620), and is further provided with a protrusion 840 on its side surface. As shown in FIG. 1, the support column 620 of the support leg 600 is inserted from below until it penetrates through the accommodation hole 830, and is clamped on the upper surface of the lower connecting member 820 by a pressure bearing plate and a nut. That is, the lower connecting member 820 is firmly fixed by being sandwiched between the pressure bearing plate and the nut from the upper surface side and the joist 200 from the lower surface side. Therefore, the pressure support plate needs to have a shape slightly larger than the cross section of the accommodation hole 830.

  As described above, the connecting material 800 is installed in the connection space formed between the adjacent floor panels 300. In the connection space, the end surfaces of both adjacent floor panels 300 face each other, that is, the recesses 320 provided in the end surfaces face each other. Then, when the connecting member 800 is installed in the connection space, the protrusion 840 thereof 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 of the connecting member 800 are inserted into the recesses 320 of the floor panels 300 that are adjacent to each other on the left and right. Therefore, the protrusion 840 has a shape protruding toward the floor panel 300 side and can be inserted into the recess 320. Furthermore, it is preferable to provide the protrusion 840 at a position where the lower surface of the protrusion 840 contacts 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 pressure bearing plate and the nut, the protrusion 840 presses the recess 320, and as a result, the connecting member 800 connects the floor panels 300 adjacent to each other on the left and right and at the same time. 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 installed 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 inserting the left protrusion 840 into the recess 320 of the left floor panel 300a, and is tightened with the pressure bearing plate and the nut. At this time, since there is no upper connecting member 810, the upper part of the lower connecting member 820 is open, and the work of tightening the upper surface of the lower connecting member 820 with the pressure bearing plate and the 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. The connecting material 810 is installed. Depending on the situation of the site, the left and right floor panels 300 may be installed after the connecting material 800 is installed first. Depending on the shape of the connecting material 800, the left and right floor panels 300 may be 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 supporting leg 600 (particularly the supporting column 620), but forms an open space shown in FIG. 6B. By doing so, this cavity can be omitted. The open space will be described below. In FIG. 3B, six rows of the connecting members 800 are arranged in the X-axis direction, but the upper connecting members 810 forming the one row of connecting members 800 are divided into a plurality of parts. Then, the divided upper connecting members 810 are arranged on the lower connecting member 820, but as shown in FIG. 6B, only the place where the support leg 600 is installed is arranged to provide a void. As a result, only the lower connecting member 820 is arranged at the installation location of the support leg 600, and an open space is formed above it. 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 pressure bearing plate and the nut can be tightened afterwards for adjustment. In addition, when the one row of the connecting members 800 shown in FIG. 3B is sufficiently long, the lower connecting member 820 may be divided into a plurality of parts.

  The connecting member 800 described so far has one protrusion 840 provided on each of the left and right sides, but the present invention is not limited to this, and various connecting members 800 such as two protrusions 840 provided on one side can be used. 7A and 7B are cross-sectional views showing various connecting members 800. FIG. 7A shows a connecting member 800 having two protrusions 840 on both sides, and FIG. 7B shows one protruding portion 840 on one side. The connecting members 800 provided with two protrusions 840 on the other side thereof are respectively shown. It should be noted that both FIG. 7A and FIG. 7B show an integrated connecting member 800 that is not divided into upper and lower parts.

  When two upper and lower protrusions 840 are provided on both left and right sides as in the connecting member 800 shown in FIG. 7A, the floor panel 300a arranged on the left side has two recesses 320 on the upper and lower sides. Is provided, and recesses 320 are also provided at two upper and lower positions on the end surface of the floor panel 300b arranged on the right side. As a result, the left and right four protrusions 840 are inserted into the recesses 320, respectively. On the other hand, when the upper and lower projections 840 are provided on the left side and one projection 840 is provided on the right side in the middle as in the connecting member 800 shown in FIG. 7B, the floor panel 300a arranged on the left side. The recesses 320 are provided at two upper and lower positions on the end surface of the floor panel 300, and only one recess 320 is provided in the middle of the end surface of the floor panel 300b arranged on the right side. As a result, the left and right three protrusions 840 are inserted into the recesses 320, respectively.

(Floor base material and floor finish material)
When the floor panel 300 and the connecting material 800 are installed, the floor base material 400 is laid on the floor panel 300, and the floor finishing material 500 is installed on the upper surface of the floor base material 400, as shown in FIG. To be done. At this time, if the floor base material 400 is made of a wood 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 is widened, which is preferable. In this case, the floor base material 400 can be fixed by nailing it with screws or screws, but if the floor panel 300 is an extruded cement board, it is difficult to fix it with nails or screws. Therefore, the 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 struck with a nail or a screw at a position overlapping the upper connecting material 810.

(Structure on the inner wall side)
Up to this point, the case in which 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. The connecting member 800 may be 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 installed closest to the inner wall 900 and the inner wall 900 facing the floor panel 300. 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 parallel) to the joist 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 the end surface, and the recess 320 is provided in 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. Construction Method of Dry Double Floor Structure Next, a construction method of the dry double floor structure of the present invention will be described. The method for constructing the dry double floor structure of the present invention is the method for constructing the dry double floor structure described so far, and therefore the content overlapping with “1. Dry double floor structure and connecting material” The explanation will be omitted, and only the contents peculiar 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 flow chart showing the flow of main steps of the method for constructing a dry double floor structure of the present invention. The method for constructing 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 base slab 100 in a predetermined arrangement (Step 20: support leg installation step). 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 step). At this time, if the joist 200 is placed on the upper surface of the support leg pedestal 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 the bearing plate and the nut. Good.

  When the joists 200 can be fixed, the floor panel 300 is placed on the joists 200 (Step 40: floor panel placing step), and the connecting material 800 is installed between the adjacent floor panels 300 (connection space) (Step 50: Connecting material installation process). At this time, as shown in FIG. 2, one (for example, left side) floor panel 300a may be placed after the connecting member 800 is installed, and then the other (for example right side) floor panel 300b may be placed. The floor base material 400 is placed on the floor panel 300 laid out at the end, and the floor base material 400 is struck with nails or screws at a position where the floor base material 400 overlaps the upper connecting material 810 made of a wood 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 carried out 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 diagram comparing the sound insulation effects of the dry double floor structure of the present invention and the conventional structure, and shows reduction amounts for a lightweight floor impact sound and a 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 as compared with the conventional structure. That is, it can be understood that the dry double floor structure of the present invention can effectively insulate various noises.

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

100 foundation slab 200 joist 210 (joist) top board 220 (joist) side board 300 floor panel 310 cavity (of floor panel) 320 recessed part (of floor panel) 400 floor base material 500 floor finishing material 600 support leg 610 (support foot) ) Pedestal 620 Support column (for supporting leg) 630 Stopper (for supporting leg) 700 Support leg pedestal 800 Connecting member 810 (Constituting connecting member) Upper connecting member 820 (Conforming connecting member) Lower connecting member 830 (Connecting member) ) Receiving hole 840 Protrusion (of connecting material) 900 Inner wall

Claims (9)

A basic slab,
Support legs 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 member between the adjacent floor panels, which is installed in a direction orthogonal to the joists ,
The connecting member has a housing hole for housing the support leg, and a protrusion protruding toward the floor panel,
The support leg is installed at a position where the joist and the connecting member intersect,
By arranging the adjacent floor panels with a gap, a connection space is formed,
A recess is provided on an end surface of the floor panel facing the adjacent floor panel,
The protrusion is inserted into the recess, and the connecting member is installed in the connection space.
A dry double-floor structure characterized by this. A basic slab,
Support legs 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 member installed between the adjacent floor panels,
The connecting member is composed of an upper connecting member and a lower connecting member that are vertically stacked , and has an accommodation hole that accommodates the support leg, and a protrusion that protrudes toward the floor panel,
The protrusion is provided on the lower connecting member,
By arranging the adjacent floor panels with a gap, a connection space is formed,
A recess is provided on an end surface of the floor panel facing the adjacent floor panel,
The protrusion is inserted into the recess, and the connecting member is installed in the connection space.
A dry double-floor structure characterized by this. In the floor structure installed in the area surrounded by the inner wall,
A basic slab,
Support legs installed on the foundation slab,
A joist supported by the support leg and having a top plate,
A plurality of floor panels arranged above the joists,
A connecting member installed between the floor panel and the inner wall,
The connecting member is composed of an upper connecting member and a lower connecting member that are vertically stacked , and has an accommodation hole that accommodates the support leg, and a protrusion that protrudes toward the floor panel,
The protrusion is provided on the lower connecting member,
By arranging the floor panel with a gap between it and the inner wall, a connection space is formed,
A recess is provided in an end surface of the floor panel facing the inner wall,
The protrusion is inserted into the recess, and the connecting member is installed in the connection space.
A dry double-floor structure characterized by this. The connecting member is composed of the lower connecting member and a plurality of the upper connecting members arranged on the lower connecting member,
The upper coupling member is arranged so as to provide a space above the accommodation hole provided in the lower coupling member, so that an open space is formed above the accommodation hole.
The dry double floor structure according to claim 2 or 3, wherein Floor base material installed on the surface of the plurality of floor panels arranged in a plane,
Further comprising 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 floor base material is fixed to the upper connecting member by nails or screws,
The dry double floor structure according to any one of claims 2 to 4. The floor panel is an extruded cement board,
The dry type double floor structure according to any one of claims 1 to 5. The joist is formed of channel steel and is placed on a support leg base fixed to the support leg,
The joist is arranged in a posture in which the support leg pedestal is housed in the groove-shaped space of the joist,
7. The dry double floor structure according to any one of claims 1 to 6. A basic slab construction process for building a basic slab,
A support leg installation step of installing support legs on the foundation slab;
A joist fixing step of fixing joists having a top plate to the support legs,
A floor panel placing step of placing a floor panel on the joists,
A connecting material installation step of installing a connecting material between the adjacent floor panels,
On the surface on which the plurality of floor panels are arranged in a plane, a floor finishing material installation step of installing a floor base material and a floor finishing material,
The connecting member is composed of an upper connecting member and a lower connecting member that are vertically stacked , and has an accommodation hole that accommodates the support leg, and a protrusion that protrudes toward the floor panel,
By arranging the adjacent floor panels with a gap, a connection space is formed,
A recess is provided on an end surface of the floor panel facing the adjacent floor panel,
In the connecting material installation step, the protrusion provided on the lower connecting material is inserted into the recess to install the connecting material in the connection space.
A method for constructing a dry double floor structure, which is characterized in that In a floor structure including a base slab, a support leg installed on the base slab, a joist fixed to the support leg, and a floor panel placed on the joist, the floor panels adjacent to each other 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 housing hole for housing the support leg, and has a protrusion protruding toward the floor panel,
The upper connecting member is formed of a wood material,
The connecting member, wherein the protrusion has a shape that can be inserted into a recess provided in an end surface of the floor panel.

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