JP5363765B2 - Floor foundation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent living noise from being propagated to downstairs. <P>SOLUTION: An underfloor ground structure is preferably used in the underfloor ground of a second floor of a wooden dwelling house. Edge joists 11 are mounted on a base plate of a thick plywood 1 at the corners of walls 4. A plurality of beams 12 extend in the directions parallel to or orthogonal to the longitudinal directions of the edge joists. On the lower surfaces of the beams, rubber legs 13 are provided at fixed intervals in the longitudinal directions of the beams. The edge joists include a pair of longitudinal materials 111 and 112 extending in parallel with a prescribed space therebetween and a plurality of transverse materials 113 extended between the pair of longitudinal materials so that the edge joists are formed in a ladder shape in plan view. In at least one edge joist, a seed 114 is provided in an inner side surface of the longitudinal material located at a position separated from the wall of the pair of longitudinal materials. To this seed, a seed 121 provided at one end in the longitudinal direction of the beam is fitted so that the beam is connected to the edge joist to be integrated. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a floor foundation structure. The floor foundation structure of the present invention is particularly suitably applied to a floor foundation such as the second floor of a wooden-type detached house, or a floor foundation of the second floor or more of an apartment house, and living noise generated on the floor propagates downstairs. To prevent 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.

  In addition, when heavy furniture is placed on the floor along the wall, if the joist width is small when supporting the floorboard, the weight of the front side of the furniture will be applied to the floorboard, and there will be support under the floorboard There are problems that the floorboard bends at the place where it does not, the furniture tilts to the front side (the direction away from the wall), and the furniture itself and the stored items in the furniture vibrate and emit an unpleasant noise.

  Therefore, the problem to be solved by the present invention is to effectively prevent living noise from propagating 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 It is to provide a floor foundation structure having a high strength so that it can be supported in a stable state without causing tilt or vibration even if it is placed along.

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 elastic legs provided at regular intervals in the longitudinal direction of the pier between the lower surface of the pier and the base, and the joists are a pair of vertical members extending in parallel at a predetermined interval, and A plurality of cross members spanned between the pair of longitudinal members, and are integrally formed in advance in a substantially ladder shape in plan view, and at least one of the pair of longitudinal members is located away from the wall. A floor and a step are provided on the outer surface of the vertical member, and the pier is connected and integrated with the joist by fitting the fruit provided at one end in the longitudinal direction of the pier. It is a geological structure.

Further, the present invention according to claim 2 is a joist when placed at a corner between a base and a wall, a plurality of pedestals provided in a direction parallel or perpendicular to the longitudinal direction of the joists, and the lower surfaces of these pedestals The base joist has a pair of vertical members extending in parallel at a predetermined interval, and a pair of vertical members provided between the pair of vertical members. It is integrally formed in advance with a plate material to be bridged, and at least one of the pair of vertical members in the joist is provided with a fruit and a step on the outer surface of the vertical member positioned away from the wall. The floor base structure is characterized in that the pier is connected and integrated to the joist by fitting a fruit provided at one end in the longitudinal direction of the pier.

  According to the floor foundation structure of the present invention, 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. Is substantially prevented from propagating.

  The joist of the floor foundation structure of the present invention according to claim 1 has a pair of vertical members extending in parallel at a predetermined interval, and a plurality of cross members spanned between the pair of vertical members. Since it is formed in a substantially ladder shape in plan view, even if heavy furniture is placed thereon, the weight can be substantially supported by the joist. Therefore, the disadvantages of the prior art, such as the tilting of the furniture, the furniture itself and the stored items in the furniture vibrating and generating unpleasant noises, are not exposed, and the vibration and deflection of the floor board hardly occur.

  The joist of the floor foundation structure of the present invention according to claim 2 is formed from a pair of vertical members extending in parallel at a predetermined interval and a plate member spanned between the pair of vertical members. Even if heavy furniture is placed on top, the weight can be supported in a well-balanced manner by the surface of the joists. Therefore, the disadvantages of the prior art, such as the tilting of the furniture, the furniture itself and the stored items in the furniture vibrating and generating unpleasant noises, are not exposed, and the vibration and deflection of the floor board hardly occur. Furthermore, since the fixed position is not limited as long as the floor board constructed on this floor foundation structure is on the board material of the thick joist, workability is good.

  Furthermore, a fruit is provided on the outer surface of the vertical member located away from the wall of the pair of vertical members constituting the thick joist, and this is actually fitted to one end in the longitudinal direction of the pier. A plurality of piers provided in a direction orthogonal to the can be integrally connected, and the strength as a floor foundation structure is ensured.

  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.

In one embodiment of the present invention, the joist has a pair of longitudinal members extending in parallel at a predetermined interval and a plurality of transverse members spanned between the pair of longitudinal members, and is a substantially ladder in plan view. It is formed in a shape. A pair of vertical members and a plurality of cross members constituting the joist are all woody, for example, LVL, plywood, MDF and the like. In the pair of longitudinal members, the interval (predetermined interval) D ₁ (FIG. 5) between the center line of one longitudinal member and the center line of the other longitudinal member is within a range of, for example, 250 to 500 mm. An appropriate interval is set accordingly, but as an example, D ₁ = 278 mm. The pitch P ₁ (FIG. 5) of the cross member is preferably matched with the width dimension of the floor board, for example, P ₁ = 303 mm. When within range of the thickness H ₁ of the joist, for example 40-60 mm, but set according to the height of the plywood and joists to a large pull provided under the subfloor structure of the present invention, H _{1 =} 50 mm as an example It is.

In another embodiment of the present invention, the joist is formed from a pair of vertical members extending in parallel with a predetermined interval, and a plate member spanned between the pair of vertical members. A pair of vertical members and plate members that constitute the joist are all woody, for example, LVL, plywood, MDF, and the like. At this time, the joist thickness H ₆ is set in the range of 40 to ₆₀ mm, for example, according to the plywood provided under the floor foundation structure of the present invention and the joist or large pulling height dimension. As an example, H ₆ = 50 mm. In addition, the width of the thick joist is set to 250 to 500 mm, and the width of the plate material is set within a range of 200 to 500 mm according to the purpose of use. As an example, the width of the thick joist and the plate material is set to 328 mm. The plate material may be bridged between the vertical members so that the surfaces are flush with the outer surfaces of the pair of vertical members. Alternatively, by providing a stepped portion so that the height H ₇ on one end of the longitudinal member to be inside the subfloor, stepped portion and the plate member protruding by bridging the plate member so as to protrude on the stepped portion A recess for fitting may be formed between the ends. Examples of dimensions in this case are: width of the joist D ₅ = 353 mm, width of the plate D ₇ = 328 mm, step width D _{6 of} the inner vertical member D = 25 mm, thickness of the joist H ₆ = 50 mm, step The formation height of H ₇ is 25 mm.

  Of the pair of longitudinal members constituting the joist, the fruit is provided on at least the outer side surface of the longitudinal member located away from the wall, but the fruit may be provided on both side surfaces of the longitudinal member. The actual shapes are Ayakaki, Izanez, Honzan, etc. This fruit is provided as a female fruit or a male fruit, and fits with a male fruit or a female fruit provided as having a shape corresponding to one end in the longitudinal direction of the 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 on the longitudinal member itself (within the thickness range of the longitudinal member), but also for fitting between the step portion provided on the outer surface of the longitudinal member and the plate member disposed thereon. A form in which a recess is formed is also included.

  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 (FIG. 11). Moreover, a soundproofing property can be improved by sticking or attaching a soft sheet to the lower surface of the vertical member or the lower surface of the piece or block constituting the joist.

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 outer surface of the vertical member located away from the wall in 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 outer surface of the vertical member is formed as a female fruit having a shape that can be fitted to the male 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.

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 protrusion pitch P ₂ (FIG. 6) preferably matches or substantially matches 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 more is more preferable from the viewpoint of maintaining the soundproofing property.

The height of the leg is a size 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 10 is provided on a thick plywood 1 (24 mm thick) laid on a large pull 2 on a floor of a house, on which a floor board 3 is placed. Is laid. Reference numeral 5 denotes a skirting board.

  The floor foundation structure 10 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 of the movement. 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 laid on the joists 11 and the piers 12 with nails or an adhesive (not shown).

As shown in FIG. 5, the joist 11 includes a pair of longitudinal members 111 and 112 extending in parallel with a predetermined interval, and a plurality of transverse members 113 spanned between the pair of longitudinal members 111 and 112. And has a substantially ladder shape in plan view. In this embodiment, the size of the joist 11 is length L ₁ = 1777 mm, width = 353 mm, core width D ₁ = 303 mm, and thickness H ₁ = 50 mm. The mounting pitch P ₁ of the cross member 113 is 303 mm. One of the longitudinal members 111 is provided with a female fruit 114 that opens to the side surface over the entire length in the longitudinal direction. The vertical members 111 and 112 have a width of 50 mm and the horizontal member 113 has a width of 100 mm, and their thicknesses are the same (H ₁ ). The materials of the vertical members 111 and 112 and the horizontal member 113 are all LVL.

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, and the like are suitable. The dimension Q of the front end portion of the crosspiece 12 on which the male body 121 is formed is determined such that the dimension Q + the width dimension of the vertical member of the joist 11 (50 mm) = the width dimension of the floor board 3 (303 mm). Therefore, in this case, Q = 253 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 rectangle 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.

  With reference to FIG. 3, the joist 11 shown in FIG. 5 is placed on the thick plywood 1 in a state where the side surface of one vertical member 112 is in contact with the wall surface 4 a via the cushion material 14. The cushion material 14 may be attached to the side surface of the vertical member 112 of the joist 11 in advance. The cushion material 14 may be provided continuously or intermittently at intervals. By providing the cushion material 14, the joist 11 and the wall surface 4a are not in direct contact with each other, and the soundproofing 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.

In addition, when the joist 11 is arranged in this way, the other vertical member 111 is located away from the wall 4 and the female fruit 114 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 114, 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. .

  At the other end in the longitudinal direction of the pier 12, a female fruit 122 having a shape capable of fitting the male fruit 121 (and therefore substantially the same shape as the female fruit 114 provided on the side surface of the vertical member 111 of the joist 11) is formed. Therefore, 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 to FIG. It is constructed in a state where it is abutted against the inner surface of the steel plate or 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. Further, in FIG. 4, a female fruit 114 is provided on the side surface of the vertical member 111 of the joist 11, but since the female fruit 114 abuts against the wall surface 4 a via the cushion material 14, It is not used as what fits 121.

  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 the female fruit 114 opened on the outer surface of the vertical member 111 of the 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 surface of the joist 11 and the pier 12 and the floor board 3 is placed on the surface with a gap of 3 mm from the wall surface 4a. Or it fixes with the fixing tools 20, such as 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. When the males 121 are inserted and fixed with screws 18 in this way, a gap 16 of about 3 to 5 mm is formed between the joist 11 (the joist at the lower left of FIG. 10) and the joist 11 facing the joist 11. 4) Cut the edges so that they are open.

  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 is the same as the joist 11 in that the vertical members 221 and 222 and the cross member 223 are formed in a ladder shape, but the cross member 223 is attached to the lower surface of the vertical members 221 and 222. Corresponding to the position, a rectangular parallelepiped block 224 is fixed at the same pitch P ₄ = 303 mm as the cross member mounting pitch, and a soft sheet 225 having a thickness of about 1 mm is attached to the lower surface of the block 224. In this embodiment, the joist 22 has a length L ₄ = 1777 mm, a width = 353 mm, a core width D ₃ = 303 mm, a thickness H ₄ = 24 mm of the longitudinal members 221 and 222, and a block thickness H. ₅ = 25 mm. The point that the female fruit 226 is formed on the side surface of one longitudinal member 221 is the same as that of the joist 11 described above. The vertical members 221 and 222 have a width of 50 mm, the horizontal member 223 has a width of 100 mm, and the thicknesses thereof are the same (H ₄ ). The materials of the vertical members 221 and 222 and the horizontal member 223 are all LVL.

FIG. 12 shows still another configuration example of joists when used in the floor foundation structure 10 of the present invention. At this time, the joist 23 has a pair of vertical members 231 and 232 that extend in parallel at a predetermined interval, and a wide plate member 233 that is spanned between the pair of vertical members 231 and 232. Has been. In this example, the size of the joist 23 is length L ₁ = 1818 mm, width D ₄ = 328 mm, and thickness H ₆ = 50 mm. At this time, the thickness H ₆ of the joists 23 is equal to the height of the pier 12 in which the rubber legs 13 are inserted. The size of the plate member 233 is the same as that of the joist 23, and the length L ₁ = 1818 mm and the width D ₄ = 328 mm.

The heights of the vertical members 231 and 232 both coincide with the dimension obtained by subtracting the thickness of the plate member 233 from the thickness H _{6 of the} joist 23, and the length coincides with the length L _{1 of the} joist 23. In the embodiment, the vertical member 232 positioned outside in the floor foundation structure 10 is a square bar having a rectangular cross section, whereas the vertical member 231 positioned inside has a height H ₇ = 25 mm at one end of the square bar. A stepped portion is formed over the entire length in the longitudinal direction by cutting out at a height position, and a fitting recess 234 for receiving the male 121 of the crosspiece 12 is formed between the stepped portion and the protruding end of the plate member 233. doing. The material of the vertical members 231 and 232 is LVL, and the material of the plate member 233 is plywood.

FIGS. 13A to 13C show still another configuration example of joists when used in the floor foundation structure 10 of the present invention. At this time, the joist 24 is formed by having a pair of vertical members 241 and 242 extending in parallel at a predetermined interval, and a single wide plate member 243 spanned between the pair of vertical members 241 and 242. Has been. The size of the joist 24 in this embodiment is length L ₁ = 1818 mm, width D ₅ = 353 mm, and thickness H ₆ = 50 mm. At this time, the thickness H ₆ of the joists 24 is made equal to the height of the crosspiece 12 in which the rubber legs 13 are inserted. The size of the plate member 243 is L ₁ = 1818 mm, the length of which is the same as that of the thick joist 24, but is narrower by D ₆ = 25 mm than the hot joist 24 by the width D ₇ = 328 mm.

The height of the longitudinal member 241 and 242 coincides with the size obtained by subtracting the thickness of the plate member 243 from the thickness H ₆ of the joist 24 when both are consistent with the length L ₁ of the joist 24 when the length, the In the embodiment (FIG. 13C), the vertical member 242 located outside in the floor foundation structure 10 is a square bar having a square cross section, whereas the vertical member 241 located inside is the upper end on one side of the square bar. Is cut out at a height of H ₇ = 25 mm to form a step portion over the entire length in the longitudinal direction, and the male 121 of the pier 12 is received between the step portion and the protruding end of the plate member 243. The fitting recess 244 is formed. The materials of the vertical members 241 and 242 and the plate member 243 are all LVL.

  FIGS. 13D to 13F show a modification of the method for forming the vertical members 241 and 242 and the fitting recess 244. Each of the vertical members 241 and 242 may be a single bar-shaped member, but may be formed by combining and joining a flat plate-shaped member and a bar-shaped member as shown in FIG. In this way, it is possible to form the fitting recess 244 while omitting the processing work of cutting out the outer upper end of the vertical member 241. Further, a stepped portion is formed by notching or combining a flat plate member and a rod-shaped member at one or both inner upper ends of the vertical members 241 and 242, and a plate member 243 is arranged so as to be bridged over the stepped portion. Also good. If it does in this way, the board | plate material 243 will be stably spanned between the vertical members 241,242, and the integrity and intensity | strength as the joist 243 will increase. Further, instead of forming the fitting recess 244 between the step formed on the outer upper end of the longitudinal member 241 and the protruding end of the plate member 243, a fitting recess or female fruit 244 is formed in the longitudinal member 241 itself. You may do it.

  Next, with reference to FIGS. 14-16, the construction method of the floor foundation structure using the plate-shaped edge joists 23 and 24 (henceforth, represented by plate-like edge joists 23) is demonstrated. As will be understood from the following description, this floor foundation structure has an advantage that simple construction can be performed.

  As described above with reference to FIG. 7, ink is applied to 24 mm thick plywood 1 (Tokyo plywood industrial association, “Nedanon” (trademark) of Tohoku plywood industrial association, etc.) laid on the overdraw 2 or the like. After adjusting the base of the room in which the floor base structure is provided, as shown in FIG. 14, a gap of 3 mm is formed between the joist 23 and the wall surface, and a screw 17 having a length of 75 mm or more is formed. And fix to the thick plywood 1.

Then, as shown in FIG. 15, a male 121 at one end in the longitudinal direction of the pier 12 is inserted into a recess 234 opened on the outer surface of the vertical member 231 of the joist 23, 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. 16, an adhesive (not shown) is applied to the surface of the joist 23 and the pier 12, and the floor board 3 is placed thereon with a gap of 3 mm from the wall surface. Fix with a fixing tool 20 such as 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 gap 16 (about 3 to 5 mm) between the joist 23 (the joist at the lower left of FIG. 16) is opposed to the joist 23. 4) Cut the edges so that they are open.

  After constructing the floor board 3 on the entire floor foundation structure 10 in this way, the baseboard 5 is attached and cured until the adhesive dries to complete the floor.

  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.

The weight impact sound is measured in accordance with JIS A 1418-2 by measuring the amount of sound attenuation by dropping a light vehicle tire (weight: 7.3 kg, air pressure: 2.4 kg / cm ² ) from a height of 85 cm. did. 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 the top view (a), front view (b), and left view (c) which show joists when using it 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 a figure which shows the construction method of this floor foundation structure. It is a figure which shows the construction method. It is a figure which shows the construction method. It is a figure which shows the construction method. It is a top view (a), a front view (b), and a left side view (c) showing another configuration example of the joist in this floor foundation structure. It is a top view (a), a front view (b), and a left side view (c) showing still another configuration example of the joist in the floor foundation structure. It is a top view (a), a front view (b), and a left side view (c) showing still another configuration example of the joist in the floor foundation structure. (D)-(f) is the left side view similar to the figure (c) which shows the example of a different form about the vertical member and the recessed part for fitting in Tokita. It is a figure which shows the construction method of the floor foundation structure using the joist of FIG. It is a figure which shows the construction method. It is a figure which shows the construction method.

Explanation of symbols

1 Thick plywood (base)
2 Large-scale 3 Floor board 4 Wall 5 Skirting board 10 Floor foundation structure 11 Nekita 111,112 Vertical material 113 Horizontal material 114 Female fruit (fruit)
12 Jetty 121 Yumi (fruit)
122 Female 123 Hole 13 Rubber leg (elastic leg)
131 Upper end protrusion 132 Annular dent 14 Cushion material 15 Spacer 16 Gap 17 Screw 18 Screw 19 Sound absorbing material 20 Floor nail 21 Screw 22 Round joist 221, 222 Vertical member 223 Horizontal member 224 Block 225 Soft sheet 226 Female fruit (actual)
23 Junkita 231 232 Vertical material 233 Plate material 234 Recess for fitting (actual)
24 Junkita 241 242 Vertical material 243 Plate material 244 Recess for fitting (actual)

Claims (2)

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 The elastic joist has a pair of longitudinal members extending in parallel at a predetermined interval and a plurality of transverse members spanned between the pair of longitudinal members. Are formed integrally in advance in a substantially ladder shape in plan view, and at least one of the pair of vertical members in the joist is provided with a fruit and a step on the outer surface of the vertical member positioned away from the wall. A floor foundation structure characterized in that a pier is connected and integrated with a joist by fitting a fruit provided at one end in the longitudinal direction of the pier. 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 The elastic joists are formed integrally in advance from a pair of vertical members extending in parallel at a predetermined interval and a plate member spanned between the pair of vertical members. In addition, a fruit and a step are provided on the outer surface of the longitudinal member that is positioned away from the wall of the pair of longitudinal members in at least one joist, and this fruit is provided at one end in the longitudinal direction of the pier. A floor foundation structure characterized in that the pier is connected and integrated into the joist by fitting.

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