JP5543087B2 - Floor foundation structure - Google Patents

Description

  The present invention relates to a floor foundation structure. The floor foundation structure of the present invention is particularly suitably applied to floor foundations such as the second floor of a wooden detached house, or floor foundations of two or more floors of an apartment house, and living noise generated on the floor propagates downstairs. To suppress that. The floor foundation structure of the present invention is a base such as a thick plywood (for example, plywood having a thickness of 24 mm, 28 mm, etc.) laid on a large pull, or a 12 mm plywood laid on a large pull and a joist on it. It is provided on the top.

Patent Document 1 below shows a floor base structure in which a floor board is laid on a joist when provided on a floor base, and an adhesive sheet for fixing the joist is provided between the joist and the wall material. ing. The floor plate away from the wall is supported by a plate-like damping rubber and a support bar.
JP 2002-309757 A

  The above conventional floor foundation structure relatively well prevents living noise generated by walking on the floor or falling objects on the floor from propagating from the joist through the walls to the downstairs. With respect to daily noise transmitted from the floor board to the lower floor via the floor base, the effect of preventing propagation is insufficient, and further improvement measures have been demanded.

  Therefore, the problem to be solved by the present invention is to effectively suppress the propagation of living noise downstairs in the floor structure of the second floor of a wooden detached house or the second floor or more of a wooden apartment house, and to provide sufficient strength. It is to secure.

In order to solve the above problems, the present invention according to claim 1 is directed to a joist when placed at a corner between a base and a wall, and a plurality of piers provided in a direction parallel or perpendicular to the longitudinal direction of the joist. And a floor base structure having elastic legs provided at regular intervals in the longitudinal direction of the pier between the bottom surface and the base of the pier, A bar-like member having a height corresponding to the gap between the lower surface of the floor board laid on the upper surface and the upper surface of the base and having a height equal to the total size of the thickness of the pier and the height of the legs , and at least one On the side joist, the inner surface is provided with a fruit and a step, and the height of the notch above the step is substantially the same as the thickness of the pier. with fitted fruit provided a mounted桟木is on the step portion Wherein the桟木is integrally connected to the joists when by being.

  The present invention according to claim 2 is characterized in that, in the floor foundation structure according to claim 1, one joist is placed on the base of one side and the corner of the wall.

  According to a third aspect of the present invention, in the floor foundation structure according to the first aspect, two or more joists are placed in parallel at a distance from the base of one side and the corner of the wall. .

  According to the floor foundation structure of the present invention according to the first aspect, most floor boards except the floor boards supported by the joists are supported by the piers and elastic legs. Living noise generated by walking on this floor or falling objects on the floor is transmitted from the floor board to the pier, most of which is blocked by the elastic legs provided under the pier and downstairs. Suppresses propagation.

  The inner side of at least one joist is provided with fruit, and this is actually fitted at one end in the longitudinal direction of the pier so that a plurality of piers provided in a direction perpendicular to the joist are connected together. It is possible to secure the strength as a floor foundation structure.

  In the floor foundation structure of the present invention according to claim 2, since one joist is placed on the base of one side and the corner of the wall, the pier is provided with elastic legs over almost the entire construction surface without taking a width. Can improve the soundproofing performance. Moreover, since it is easy to cut according to the size of a construction location, it is suitable for construction in a narrow location or a corridor.

  In the floor foundation structure according to the third aspect of the present invention, since two or more joists are placed in parallel at intervals on the base on one side and the corner of the wall, a heavy object such as furniture is placed on the wall. When placed, the weight can be stably supported by the rod-shaped joists placed in parallel at intervals. Moreover, the space | interval according to the size of a floor board and the depth of heavy objects, such as furniture, can be determined freely. Furthermore, even when there is a place where a floor board shorter than the interval between the rod-shaped joists is used in the construction, a structure that matches the construction place is adopted such as adding a bar within the interval according to the fixed position of the floor board. be able to.

  The floor foundation structure of the present invention comprises a joist when placed at a corner between a base and a wall, a plurality of piers provided in a direction parallel to or perpendicular to the longitudinal direction of the joists, and a lower surface and a base of these piers. And having elastic legs provided at regular intervals in the longitudinal direction of the pier. One or two or more parallel joists may be placed in parallel on the base of one side and the corner of the wall. In this case, the single joist may be a series of rod-shaped joists. It may be intermittently connected in a state of being divided into several.

In the case of the floor foundation structure, the konjo is a rod-like member having a height corresponding to a gap dimension between the lower surface of the floor board laid on the joist and the pier and the upper surface of the base. The cross-sectional shape is not particularly limited, but is preferably rectangular or substantially rectangular. Tokita is a wood-based material, such as LVL, plywood, MDF, and the like. The thicknesses H ₁ (FIG. 5 (b)), H ₄ (FIG. 11 (b)), and H ₆ (FIG. 12 (b)) of the joists are within a range of 40 to 60 mm, for example. It is selected according to the height dimension of the joist or large pulling provided under the floor foundation structure and the thickness dimension of the thick plywood laid on this, but as an example, H ₁ = H ₄ = H ₆ = 50 mm It is. For example, the length L ₁ = L ₃ = L ₄ of the joist is 1700 to 1900 mm, and the widths D ₁ , D ₃ and D ₄ are 30 to 100 mm, for example. In the case where a step is provided on the joist, for example, it is formed at a height position of H ₇ = 20 to 40 mm with a width D ₅ = 20 to 40 mm.

  At least one inner joist (if two or more joists are placed in parallel at a distance, the joist located furthest from the wall) is provided with fruit on at least the inner side, but both sides Fruits may be provided on the surface. The actual shapes are real, agile, and awkward. This fruit is formed as a male fruit or a female fruit, and fits with a female fruit or a male fruit provided as having a shape corresponding to one end in the longitudinal direction of a pier described later. Here, the term “real” is a concept that broadly encompasses irregular shapes that can be fitted to each other, and is not necessarily limited to a shape in which one convex portion is fitted into the other concave portion with substantially no gap. Moreover, not only when the fruit is formed (within the thickness range of a single member) (FIGS. 3 and 4), but also between the step portion provided on the inner surface of the bar and the plate material disposed thereon It also includes a form (FIGS. 11, 12 (c) and (d)) in which a recess for fitting is formed between them.

  The jokita is placed on the base, but it is not always necessary that the lower surface of the jombo is in full contact with the base. It may be supported on the base. In addition, a soft sheet such as a plate shape or a sheet shape can be attached to or attached to the bottom surface of the joist or the bottom surface of the piece or block to enhance soundproofing.

The pier has a thickness smaller than the thickness of the thick joist, and for example, a thickness of about one half of the thick joist thickness H ₁ is taken as a guide. The material of the pier is woody, for example, LVL, plywood, solid wood, etc., but LVL is preferable from the viewpoint of strength. Since a floor board is laid on the upper surface of the pier, it is preferable that the upper surface of the pier is substantially flat. It is preferable that the lower surface of the pier is also substantially flat, and a leg protrudes from the flat lower surface.

  At one end in the longitudinal direction of the pier, a fruit that fits with a fruit formed on the inner surface of the joist is provided. For example, when the fruit provided at one end in the longitudinal direction of the pier is a male fruit, the fruit on the inner surface of the longitudinal member is formed as a female fruit having a shape that can be fitted to the male fruit. The actual shape is real, aiyakukuri, or a real fruit. It is preferable that the other end in the longitudinal direction of the pier is formed with a fruit that can be fitted into one end in the longitudinal direction so that the piers can be connected in the longitudinal direction. Note that the actual concept is the same as that described above for the actual formed on at least the inner surface of the joist, and it is a concept that widely includes uneven shapes that can be fitted to each other.

As described above, the legs protrude from the underside of the pier. For example, a plurality of holes are formed in the underside of the pier, and the upper end protrusions of the legs are inserted and fixed in these holes to protrude the legs. Can be set. The leg mounting pitch P ₂ (FIG. 6) preferably coincides with or substantially coincides with the width of the floor board, for example, P ₂ = 303 mm. The legs are made of a material having elasticity such as synthetic rubber, natural rubber, and synthetic resin, and the hardness thereof is durometer hardness (JIS K6253: 2006) of A50 to A90, preferably A65 to A85. When the hardness is less than A50, the deflection of the floor that receives a load through the legs is large and the flatness of the floor cannot be maintained. A65 or more is more preferable from the viewpoint of maintaining the flatness of the floor. On the other hand, when the hardness exceeds A90, the soundproofing property of the floor is inferior, and A85 or less is more preferable from the viewpoint of maintaining the soundproofing property.

The height of the leg is the dimension obtained by subtracting the thickness of the pier from the thickness of the joist. For example, when the thickness of the joist is H ₁ = 50 mm and the thickness of the pier H ₂ = 24 mm, the leg height H ₃ = 26 mm. The shape of the legs is arbitrary, and can be a circular, quadrangular, or other columnar shape with a cross-sectional shape or a truncated cone shape. The side surface may be provided with one or a plurality of recesses such as an annular shape.

  A floor foundation structure according to an embodiment of the present invention will be described in detail below with reference to FIGS.

  As shown in FIGS. 1 to 4, this floor foundation structure is provided on a thick plywood 1 (24 mm thick) laid on a large pull 2 on a floor of a house, and a floor board 3 is laid thereon. Is done. Reference numeral 5 denotes a skirting board.

  The floor foundation structure is orthogonal to the joist 11 when it is provided along the four corners of the corner formed by the thick plywood 1 and the wall 4 of the room, and the joist 11 when extending in a direction that coincides with the longitudinal direction of the floor board 3. And a plurality of crosspieces 12 connected to the joists 11 so as to extend in the direction. Legs (rubber legs) 13 made of a soft material are provided on the lower surface of the pier 12 at regular intervals in the longitudinal direction, and the pier 12 is placed on the thick plywood 1 as a floor base via the rubber legs 13. I support it. The floor board 3 is fixedly laid on the joists 11 and the piers 12 with a floor nail 20 (FIG. 10) or the like.

As shown in FIG. 5, the jojo 11 is a rod-shaped member having a substantially rectangular cross section. The material of the joist 11 in this embodiment is LVL, and its size is length L ₁ = 1777 mm, width D ₁ = 50 mm, and thickness H ₁ = 50 mm. A female fruit 111 that opens on one side surface (side surface that becomes the inner side surface in the installed state) of the joist is provided over the entire length in the longitudinal direction.

As shown in FIG. 6, the pier 12 has a square bar shape made of LVL provided with a male fruit 121 at one end in the longitudinal direction thereof and a female fruit 122 having a shape capable of fitting the male fruit 121 at the other end. In this embodiment, the length L ₂ = 910 mm, the width D ₂ = 50 mm, and the thickness H ₂ = 24 mm. The bottom surface of the pier 12 is provided with holes 123 at three locations with a predetermined pitch P ₂ = 303 mm. The upper end protrusion 131 (FIG. 3) of the rubber leg 13 is inserted into these holes 123. At this time, an appropriate amount of adhesive may be injected into the hole 123 in advance. As this adhesive, a silicon-based sealing agent, an acrylic resin-based adhesive, a rubber-based adhesive, a urethane resin-based adhesive, an ethylene vinyl acetate resin-based adhesive, and the like are suitable. The dimension Q of the front end portion of the crosspiece 12 on which the male fruit 121 is formed is determined so that the dimension Q + the width dimension D _{1 of the} joist 11 <the width dimension of the floor board 3 (= 303 mm). When the width dimension D _{1 of the} sheet is 50 mm and the width dimension of the floor board 3 is 303 mm, Q = 200 mm.

As shown in FIG. 3, the rubber leg 13 in this embodiment has a cylindrical shape with a diameter of 40 mm and a height H ₃ = 26 mm excluding the upper end protrusion 131, and has an annular recess 132 on its side surface. The annular recess 132 has a shape obtained by rotating a U-shape having a height of 8.5 mm and a depth of 5.5 mm around the longitudinal axis of the rubber leg 13. The rubber leg 13 is made of synthetic rubber, and its hardness is durometer hardness (JIS K6253: 2006) and corresponds to A75.

Referring to FIG. 3, the joist 11 shown in FIG. 5 has a thick plywood 1 in a state in which one side surface (side surface on which the female fruit 111 is not formed) is brought into contact with the wall surface 4 a via the cushion material 14. Place on top. The cushion material 14 may be attached to the side surface of the joist 11 in advance. The cushion material 14 may be provided continuously or intermittently at intervals. By providing the cushion material 14 in this way, it is avoided that the joist 11 and the wall surface 4a are in direct contact with each other, and the soundproof performance can be improved. The material of the cushion material 14 is arbitrary, and for example, foams such as polyolefin resin, urethane resin, and acrylic resin, and foams such as neoprene rubber and butyl rubber can be used. When the joist 11 is arranged in this way, the female fruit 111 provided on the other side surface opens to the indoor side. By fitting the male fruit 121 at one end in the longitudinal direction of the pier 12 to the female fruit 111, the pier 12 is connected to the margin joist 11. The pier 12 is supported on the thick plywood 1 via the rubber legs 13 attached by inserting the upper end protrusions 131 into the holes 123 on the lower surface thereof. The height H ₃ of the rubber leg 13 in such a mounted state is equal to the difference between the thickness of the joist H ₁ = 50 mm and the thickness of the crosspiece 12 H ₂ = 24 mm, and thus H ₃ = 26 mm as described above. . In other words, the thickness of the joist 11 is equal to the dimension obtained by adding the thickness of the pier 12 and the height of the rubber legs 13.

  At the other end in the longitudinal direction of the pier 12 is formed a female fruit 122 having a shape capable of fitting the male fruit 121 (and therefore substantially the same shape as the female fruit 111 provided on the inner surface of the joist 11). A plurality of male seeds 121 and female seeds 122 can be connected and extended in the longitudinal direction through fitting (see FIG. 2).

  After appropriately extending in this way, the pier 12 is not actually connected to the joist 11 when it is provided near the wall surface 4a on the opposite side of FIG. Alternatively, it is constructed with a slight gap 16 left (FIG. 4). In this case, it is preferable to stably support the pier 12 by arranging a spacer 15 between the end of the butt 12 and the thick plywood 1. In addition, since the said edge part of the crosspiece 12 is cut | disconnected for dimension adjustment, the female fruit 122 does not exist. In FIG. 4, a female fruit 111 is provided on the inner surface of the joist 11, but this female fruit 111 abuts against the wall surface 4a via the cushion material 14, so that the male fruit 121 of the pier 12 is fitted. It is not used as a match.

  Next, with reference to FIGS. 7-10, the construction method of this floor foundation structure is demonstrated. As will be understood from the following description, this floor foundation structure has an advantage that simple construction can be performed.

  First, as shown in FIG. 7, the base of the room in which the floor base structure is provided is adjusted. That is, inking 6 is performed on a 24 mm thick plywood 1 laid on the draw 2 or the like (“Nedanon” (trademark) of Tokyo Plywood Industrial Association, Tohoku Plywood Industrial Association, etc.).

  Thereafter, as shown in FIG. 8, a gap of 3 mm is formed between the joist 11 and the wall surface 4a, and the thick plywood 1 is fixed with screws 17 having a length of 75 mm or more.

Then, as shown in FIG. 9, the male fruit 121 at one end in the longitudinal direction of the pier 12 is inserted into a female fruit 111 that opens on the inner side surface of the rim joist 11, and the actual part is fixed with a screw 18. When a sound absorbing material is used, a sound absorbing material 19 is spread between the piers 12. The sound absorbing material 19 is preferably a material having a certain degree of hardness, such as polystyrene foam, polyethylene foam, phenol foam, rigid urethane foam, etc., and the density is, for example, 20 kg / m ³ or more. As for the thickness of the sound absorbing material 19, the sound absorbing material 19 is spread thinner than the height of the pier 12 in which the rubber legs 13 are inserted so that a gap is formed between the surface of the sound absorbing material 19 and the back surface of the floor plate 3. It is preferable. When the sound absorbing material 19 having a certain degree of hardness is used as described above, not only the sound absorbing effect but also the effect of supporting the sinking of the floor board 3 that occurs when walking on the floor and preventing further sinking. Therefore, for example, assuming that the sinking amount of the floor plate 3 is 2 mm at the maximum, a slightly smaller gap is provided between the surface of the sound absorbing material 19 and the back surface of the floor plate 3, thereby further sinking. Can be prevented.

  Next, as shown in FIG. 10, an adhesive (not shown) is applied to the surfaces of the joist 11 and the pier 12, and the floor board 3 is opened with a gap of 3 mm from the wall surface 4 a (this allows the floor board 3 to The outer vertical edge coincides with the outer edge of the joist 11 and is fixed with a fixing tool 20 such as a floor nail or a staple. Next, the crosspiece 12 is connected in the longitudinal direction through the fitting of the male fruit 121 and the female fruit 122, and a screw 21 having a length of about 25 mm is driven into and fixed to the actual fitting part. In this way, when the male 121 is inserted and fixed with the screw 18, the end is so that there is a gap 16 (FIG. 4) of about 3 to 5 mm between the joist 111 and the joist 111. To cut.

  And as shown in FIG. 1, after constructing the floor board 3 in the whole floor base structure 10, the base board 5 is attached and it cures until an adhesive agent dries. In this way, the floor is completed.

FIG. 11 shows another configuration example of joists when used in the floor foundation structure 10 of the present invention. At this time, the joist 22 has substantially the same cross-sectional shape as the joist 11 shown in FIG. 5 (FIG. 11C), but the joist 11 in FIG. In contrast to this, the joist 22 is formed by cutting the upper end on one side of the square bar 221 at a height position of height H ₅ = 25 mm to form a step 222 over the entire length in the longitudinal direction. A plate member 223 having the same width and the same length is pasted on the bar member 221, and the male member 121 of the pier 12 is received between the projecting end of the plate member projecting on the step portion 222 and the step portion 222. A recess for fitting is formed. In this embodiment, the joist 22 has a length L ₃ = 1818 mm, a width D ₃ = 50 mm, and a height H ₄ = 50 mm (= the height of the pier 12 in which the rubber legs 13 are inserted (H ₂ + H ₃ )). The material of the square bar 221 is LVL, and the material of the plate 223 is plywood.

FIGS. 12A to 12C show still another configuration example of joists when used in the floor foundation structure 10 of the present invention. At this time, the joist 23 is formed with a step 232 over the entire length in the longitudinal direction by notching the upper end of one side of the square bar 231 at a height position of height H ₇ = 25 mm, like the joist 22 shown in FIG. Then, a plate member 233 of the same length is pasted on the square bar member 231 and a recess for connecting the pier 12 is provided between the protruding end of the plate member protruding on the step portion 232 and the step portion 232. Forming. The height of the recess can be formed substantially the same as the thickness of the pier 12 and the end of the pier 121 on the side of the male 121 is stably placed on the step 232 and fitted into the recess. Is done. In this embodiment, the joist 23 has a length L ₄ = 1818 mm, a width D ₄ = 75 mm, and a height H ₆ = 50 mm (= the height of the pier 12 in which the rubber legs 13 are inserted (H ₂ + H ₃ )). The material of the square bar 231 is LVL, and the material of the plate 233 is plywood.

  12 (d) to 12 (f) show a modification of the method for forming the recess for fitting in the joist. The joist may be a single bar-shaped member, but if a flat plate-shaped member and a bar-shaped member are combined and joined together, the stepped portion 232 is saved by omitting the work of cutting out the inner upper end of the square bar 231. And since the recessed part for fitting can be formed, it is preferable. For example, the square bar 231 in FIG. 12C can be a combination of a plate 231a and a bar 231b (FIG. 12B). FIG. 12E shows an example in which a joist having a step 232 and a female fruit 234 for receiving the male fruit 121 of the pier 12 is formed by notching a single bar-shaped member. As shown in f), by using a combination of a wide plate member 231c and a bar member 231d and joining them, the step 232 is automatically formed on the plate member 231c simply by forming the female 234 on the bar member 231d. be able to.

  FIG. 13 shows an example of the floor foundation structure 10 using the joist 23 in FIG. In this example, two joists 23 and 23 are used so that the step portion 232 and the fitting concave portion face inward, and one piece is placed on the thick plywood 1 so as to contact the wall surface 4a via the cushion material 14. At the same time, another joist 23 is provided in parallel at a predetermined interval. The interval between the joists 23 and 23 is appropriately set according to the width dimension of the floor board 3 laid on the floor foundation structure 10 or the depth dimension of a heavy object such as furniture installed in contact with the wall surface 4a. be able to. The other configuration is basically the same as that of the floor foundation structure 10 shown in FIG.

  FIG. 14 shows another example of the floor foundation structure 10 using the joist 23 in FIG. In this example, three joists 23, 23 ′, 23 ′ are used so that the step 232 and the fitting concave portion face inward, and the joists 23 ′ are in contact with the wall surface 4 a via the cushion material 14. The thick joists 1 are provided on the thick plywood 1. The joists 23 'and 23 are provided in parallel with a predetermined interval therebetween. The distance between the joists 23 is appropriately set according to the width dimension of the floor board 3 laid on the floor foundation structure 10 or the depth dimension of a heavy object such as furniture installed in contact with the wall surface 4a. be able to. In the example shown in the figure, the floor plates 3 and 3 are connected by actual connection on the joist 23 'at the center. In the example shown in the figure, the two joists 23 'and 23' on the wall surface 4a side are used as a cross-sectional shape by cutting away the step 232 and the recessed portion for fitting. Instead, it may be used as the joist 23 when the shape of FIG. The other configuration is basically the same as that of the floor foundation structure 10 shown in FIGS.

  In order to verify the soundproofing performance of the floor using the floor foundation structure of the present invention, the floor using the floor foundation structure 10 (but not using the sound absorbing material 19) having the configuration shown in FIGS. And a floor in which a floor plate 12 mm is laid on a thick plywood 24 mm (hereinafter referred to as “comparative floor”) was subjected to a soundproof performance comparison test.

  The light impact sound was measured according to JIS A 1418-1 by dropping a 500 g hammer (cylindrical shape with a diameter of 30 mm) from a height of 4 cm and measuring the sound attenuation. In terms of daily noise, the sound at this time is equivalent to a spoon dropping, a chair pulling sound, a slipper pattering sound, a floor rubbing sound with a vacuum cleaner, and the like.

  As a result, the measured value at 500 Hz was LL-72 for this structural floor and LL-81 for the comparative floor. Therefore, by adopting this structural floor, an improvement of 8.0 dB was observed. In addition, when the sound absorbing material 19 was further spread on this structure floor and tested in the same manner, an improvement of about 3 dB (500 Hz) was further observed.

In addition, the weight impact sound is measured according to JIS A 1418-2 by dropping a light vehicle tire (weight: 7.3 kg, air pressure: 2.4 kg / cm ² ) from a height of 85 cm to obtain a 63 Hz sound attenuation. It was measured. In terms of daily noise, the sound at this time corresponds to a sound (dosun, dosun) when a child jumps.

  As a result, the measured value at 63 Hz was LH-69 for this structural floor and LH-75 for the comparison target floor. Therefore, the improvement of 5.6 dB was seen by adopting this structure floor. In addition, the sound absorbing material 19 was further spread on the structure floor and tested in the same manner. However, no significant improvement was observed in the heavy floor impact sound even when the sound absorbing material was used.

  As mentioned above, according to this structure floor, remarkable improvement is seen in both the light impact sound and the heavy impact sound compared with the comparison target floor, and propagation of the living noise to the downstairs can be effectively prevented. It was proved that.

  Next, a floor flexibility test was performed on the floor using the floor foundation structure of the present invention. Assuming that a human was standing on one foot, an 80 kg load was applied to a loading plate (diameter 50 mm) placed on the floor. The loading plate was placed at the center between the piers. The amount of deformation (displacement) that the floor board before applying a load deflected by applying a load was measured with a 1/100 mm dial gauge installed on the back surface of the floor board 3.

  The amount of flexure deformation was 4.18 mm, but it was almost inconspicuous when judged from the entire floor surface of the room. According to this structural floor, even when a heavy object is placed, the flexure deformation of the floor is sufficiently suppressed. It has been demonstrated that it can be done.

It is a perspective view which shows the floor foundation structure by one Example of this invention with a floor board. It is a perspective view which shows this floor foundation structure in the state which removed most floor boards. It is AA sectional drawing in FIG. FIG. 4 is a cross-sectional view near the wall surface on the opposite side to FIG. 3. It is a top view (a), a front view (b), and a right side view (c) showing a rod-shaped joist used for this floor foundation structure. It is sectional drawing (a) and bottom view (b) which show the crosspiece used for this floor foundation structure. It is explanatory drawing of the construction method of this floor foundation structure. It is explanatory drawing of the construction method. It is explanatory drawing of the construction method. It is explanatory drawing of the construction method. It is the top view (a), front view (b), and right view (c) which show another structural example of the rod-shaped edge joist used for this floor foundation structure. It is the top view (a), front view (b), and right view (c) which show another structural example of the rod-shaped edge joist used for this floor foundation structure. (D)-(f) is a right side view similar to (c) in FIG. It is sectional drawing similar to FIG. 3 which shows an example of the floor foundation structure using the joist of FIG.12 (e). It is sectional drawing similar to FIG. 3 which shows the other example of the floor foundation structure using a joist.

Explanation of symbols

1 Thick plywood (base)
2 Large draw 3 Floor board 4 Wall 5 Skirting board 11 Tokita 111 Female fruit (fruit)
12 Jetty 121 Yumi (fruit)
122 Female 123 Hole 13 Rubber leg (elastic leg)
131 Upper end protrusion 132 Annular recess 14 Cushion material 15 Spacer 16 Gap 17 Screw 18 Screw 19 Sound absorbing material 20 Floor nail 21 Screw 22 Edge joist 221 Square bar material 222 Step portion 223 Plate material 23 Edge joist 231 Square rod material 232 Step portion 233 Plate material 234 female

Claims (3)

The joists placed at the corners of the base and the wall, a plurality of piers provided in a direction parallel to or perpendicular to the longitudinal direction of the joists, and the piers in the longitudinal direction between the lower surfaces of the piers and the base A floor foundation structure having elastic legs provided at regular intervals, wherein the joist is between the lower surface of the floor board and the upper surface of the base laid on the joist and the pier of the floor foundation structure. a rod-like member having a height equal to the total size of the thickness of the leg height桟木with corresponding to gap size, and the real and the step portion is provided on the inner surface at least one time joists, moreover the The height of the notch above the step is formed to be approximately the same as the thickness of the pier, and fits the fruit that is provided at one end of the pier in the longitudinal direction of the joist and the pier is placed on the step is the桟木is integrally connected to the joists when by the Underfloor structure characterized. The floor foundation structure according to claim 1, wherein one joist is placed on the base of one side and the corner of the wall. The floor foundation structure according to claim 1, wherein two or more joists are placed parallel to each other at the base of the one side and the corner of the wall with a space therebetween.

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