JP2013253449A - Underfloor structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underfloor structure 1 capable of enhancing vibration control effect, sound insulation effect, and comfort of walking on a floor surface by interposing the underfloor structure 1 between a floor slab 2 and a floor plate body 3 when supporting the floor plate body 3 on the floor slab 2.SOLUTION: An underfloor structure 1 includes: sleeper beams 4 disposed in parallel at suitable spaces; end vibration control support means 15 for supporting both ends in the longitudinal direction of each of the sleeper beams 4; and intermediate vibration control support means 16 for supporting an intermediate area between both the ends of each of the sleeper beams 4. The intermediate vibration control support means 16 consists of an elastic buffer body 25 provided between a bottom face plate 4d of the sleeper beam 4 and a floor slab 2. The elastic buffer body 25 is formed of an elastic resin injected into a gap S formed between the bottom face plate 4d of the sleeper beam 4 and the floor slab 2 by supporting both ends of the sleeper beam 4 with the end vibration control support means 15.

Description

  The present invention relates to an underfloor structure that is disposed between a floor slab and a floor board body and supports the floor board body.

  In apartment buildings such as condominiums with a concrete beam structure with a regular beam structure, vibration applied to the floor body supported on the floor slab passes through the floor slab to other living spaces, especially downstairs living spaces. It is transmitted as large vibration and noise. For this reason, vibration control and sound insulation measures are required for the underfloor structure that supports the floor body. From such a viewpoint, as described in Patent Document 1, both ends in the length direction of the large pull beam that supports the floor main body are end vibration damping support means provided with an elastic buffer between the floor slab and However, it is considered that only the both ends in the length direction of the large pull beam are supported on the floor slab via the vibration suppression support means, and the large pull beam is mainly supported from the floor main body. It was found that sufficient vibration control and sound insulation effects cannot be expected because the vibration applied to the intermediate part in the length direction cannot be effectively absorbed. Therefore, as described in Patent Document 2, it has been considered that intermediate vibration damping support means is interposed between the floor slab and the intermediate region between both ends of the large pull beam.

JP 2006-183432 A JP 2008-127942 A

  However, as described in Patent Document 2, it is excessively costly if the same unit as the unit used for the end portion damping support means is simply used as the intermediate damping support means for the large pull beam. And sufficient cost performance cannot be expected.

  The present invention proposes an underfloor structure that can solve the conventional problems as described above, and the underfloor structure according to the first invention of the present application understands the relationship with embodiments described later. For the sake of simplicity, when the reference numerals used in the description of the embodiment are shown in parentheses, the underfloor structure (1) disposed between the floor slab (2) and the floor plate (3). ), And the large pull beam (4) arranged in parallel at appropriate intervals, the end damping support means (15) for supporting both ends of the large pull beam (4) in the length direction, and the large pull beam In the underfloor structure (1) provided with the intermediate vibration damping support means (16) for supporting the intermediate region between both ends of the beam (4), the intermediate vibration damping support means (16) The elastic buffer (25) is provided between the bottom plate and the floor slab (2), and the elastic buffer (25) is a large pull beam (4) by the end vibration damping support means (15). For supporting both ends Ri has become the bottom plate and the floor slabs (2) configuration defined by the formed gap (S) injected elastic resin in between of the Obiki Bee (4).

  The underfloor structure according to the second invention of the present application is the underfloor structure (1) disposed between the floor slab (2) and the floor plate body (3), and is arranged in parallel at appropriate intervals. The large pull beam (4), the end damping support means (30) that supports both ends of the large pull beam (4) in the length direction, and the intermediate region between both ends of the large pull beam (4) are supported. In the underfloor structure (1) provided with the intermediate vibration damping support means (32), the intermediate vibration damping support means (32) is disposed on the floor slab (2) below the large pull beam (4). A seat plate (33), one shaft body (34) connecting the seat plate (33) and the bottom plate (4d) of the large pull beam (4), the seat plate (33) and the floor slab (2) consists of an elastic buffer (35) interposed between the shaft (34) and the shaft (34) attached to the bottom plate (4d) of the large pull beam (4) so as to be adjustable in height. It has been configured.

  Further, in the underfloor structure according to the third invention of the present application, the underfloor structure (1) is disposed between the floor slab (2) and the floor plate body (3), and is arranged in parallel at appropriate intervals. The large pull beam (4), the end damping support means (30) that supports both ends of the large pull beam (4) in the length direction, and the intermediate region between both ends of the large pull beam (4) are supported. In the underfloor structure (1) provided with the intermediate vibration damping support means (40), the intermediate vibration damping support means (40) includes a seat plate (33) that supports the large pull beam (4), and a floor slab ( 2) A large beam support base (41) provided so as to protrude upward, and an elasticity interposed between the seat plate (33) and the large beam support base (41) It consists of a buffer (35).

  Further, the underfloor structure according to the fourth invention of the present application is an underfloor structure (1) disposed between the floor slab (2) and the floor plate body (3), and is arranged in parallel at appropriate intervals. Large pull beam (4), end vibration damping support means (15, 52) for supporting both ends of the large pull beam (4) in the length direction, and an intermediate region between both ends of the large pull beam (4) In the underfloor structure (1) provided with the intermediate vibration damping support means (48) that supports the intermediate vibration damping support means (48), the bottom vibration plate (4d) of the pulling beam (4) and the floor slab (2) ) Between the elastic buffer bodies (49) disposed so as to be continuous over a predetermined section in the lengthwise beam length direction.

  When the first invention is carried out, the filling hole (26) for injecting the elastic resin in the bottom plate of the large pull beam (4) in accordance with the position of the intermediate vibration damping support means (16) Can be provided penetrating in the vertical direction. In this case, the large draw beam (4) has a hollow rectangular cross section, and the air circulation openings are provided on the side plate of the large draw beam (4) at appropriate intervals in the length direction of the large draw beam (4). When (8) is provided, the elastic resin can be injected into the filling hole (26) through the air circulation opening (8) located above the filling hole (26). I can do it.

  The intermediate damping support means (16) is provided with an elastic annular member (28) sandwiched between the bottom plate of the large pull beam (4) and the floor slab (2), and this elastic annular member (28) The elastic resin can be injected into the inside. In this case, the outer shape of the elastic annular member (28) can be a truncated cone shape whose outer diameter increases toward the floor slab (2) side.

  When carrying out the second invention, the seat plate (33) is provided with a central convex portion (33a) that protrudes in a convex shape on the upper center side, and the projecting projection on the central convex portion (33a). By means of the shaft body (34), the wing plate portion (33b) on both sides of the central convex portion (33a) causes the seat plate (33) to extend toward the left and right sides of the large pull beam (4). The elastic buffer (35) can be disposed below the left and right wing plate portions (33b) of the seat plate (33). In this case, the left and right wing plate portions (33b) of the seat plate (33) are provided with filling holes (39) penetrating in the vertical direction, and the elastic buffer is formed by elastic resin injected from these filling holes (39). (35) can be formed.

  Furthermore, the large pull beam (4) has a hollow rectangular cross section, and the side plates (4a, 4b) of the large pull beam (4) have air circulation openings at appropriate intervals in the large pull beam length direction. When the portion (8) is provided, the shaft (34) has a lower end fixed to the seat plate (33) and the bottom plate (4d) of the large pull beam (4) in the vertical direction. A pair of upper and lower nuts (37, 38) that pass through and are screwed to the shaft body (34) so as to be adjustable in the vertical position sandwich the bottom plate (4d) of the large pull beam (4) from above and below. Among the nuts (37, 38), the height of the nut (37) inside the large pull beam (4) can be adjusted through the air circulation opening (8).

  Further, when carrying out the third invention, as the large beam support base (41), for example, what is composed of a sound insulation mat (46) placed on the floor slab (2), Those composed of increased concrete (47) formed on the floor slab (2) can be used. The seat plate (33) supports the large pull beam (4A) via a shaft body (34) attached to the bottom plate (4d) of the large pull beam (4) so as to be adjustable in height. A beam support seat (17) for supporting the large pull beam (4A), and a pair of left and right shaft bodies (height adjustable) attached to the beam support seat (17) on both the left and right sides of the large pull beam (4A) ( The large pull beam (4A) may be supported via 19a, 19b).

  Further, when the large pull beam support base (41a, 41b) is divided into left and right at the position of the large pull beam (4A), the large pull beam (4A) is fitted as the seat plate. Using a seat plate (44) with a central recess (44a) and blade plates (44b) projecting on the left and right sides of the center recess (44a), the left and right blade plates (44b) of this seat plate (44) It is also possible to support the large pull beam support bases (41a, 41b) divided on the left and right sides of the beam (4A) via elastic buffer bodies (45a, 45b).

  Further, when the fourth invention is carried out, the elastic buffer (49) is pulled out from the filling hole (26) penetrating in the vertical direction provided in the bottom plate (4d) of the large pulling beam (4). It can be formed of an elastic resin injected into the band-shaped gap (S) between the bottom plate (4d) of (4) and the floor slab (2). Further, in the belt-like gap (S) between the bottom plate (4d) of the large pull beam (4) and the floor slab (2), the left and right sides of the bottom plate (4d) are spaced at an appropriate interval in the left-right width direction. A pair of elastic rod-shaped members (50a, 50b) are arranged, and the elastic buffer (49) can be formed of an elastic resin injected between the pair of left and right elastic rod-shaped members (50a, 50b).

  The end damping support means commonly used in any of the first to fourth inventions is a beam including a central recess into which a large pulling beam is fitted and a wing plate portion projecting to the left and right sides thereof. A support seat, a pair of left and right shafts attached to the left and right blades of the beam support seat so as to be adjustable in height, a pair of left and right seats connected to the lower ends of the shafts, and the seat plates In the conventional vibration damping support means composed of an elastic buffer interposed between the floor slab and the floor slab, the pair of left and right seat plates can be connected to each other by a connecting member under the large pull beam . Of course, the end vibration damping support means may be a simple one made of a pressure-resistant elastic material integrally formed with a central recess into which a large pull beam fits and bottoms projecting to the left and right sides thereof.

  Furthermore, as a configuration that can be commonly used in any of the first to fourth inventions, an elastic buffer (between the large pull beam (4) and the floor plate (3) placed and supported thereon is provided. 12) can be installed. In this case, the upper plate (4c) of the large pull beam (4) is provided with a protrusion (54) continuous in the length direction of the large pull beam, and the elastic buffer (12) has the protrusion. A recessed groove portion (55) that fits around the portion (54) can be formed. In addition, between the adjacent large beam (4), the sub beam (5) in the direction perpendicular to the large beam (4) can be installed at appropriate intervals in the large beam length direction. An inverted L-shaped slit (9) is provided from the upper surface plate (4c) to the side surface plate (4a, 4b) at the shoulder portion of the sub-beam (4) at the sub beam connection position of the large pull beam (4). Is provided with a hook (11) which is inserted into the slit (9) from below and engaged with the slit (9), and the sub-beam (5) is connected to the large beam (4) by the engagement of the slit (9) and the hook (11). ) Can be detachably supported.

  According to the structure of the underfloor structure of the first invention of the present application, the large pull beam that supports the floor plate is not only supported on the floor slab by the end damping support means at both ends in the length direction. In the intermediate region between the longitudinal ends of the large pull beam, intermediate vibration damping support means for supporting the large pull beam and having an elastic buffer between the floor slab is disposed. Vibration and sound transmitted from the body to the floor slab via the large pull beam are effectively cut off by the elastic dampers of the end damping support means and the intermediate damping support means, and the damping performance and sound insulation effect High floor support structure can be realized. Further, the bending deformation of the intermediate portion of the large pull beam can be suppressed by the presence of the elastic buffer of the intermediate vibration damping support means, and the walking comfort on the floor surface can be enhanced. Further, the intermediate vibration damping support means injects an elastic resin into a gap formed between the bottom plate of the large pull beam and the floor slab by supporting both ends of the large pull beam by the end vibration suppression support means. Constructed and used as the intermediate vibration suppression support means, the same vibration damping support means as the end vibration suppression support means, which is inevitably manufactured stubbornly from metal parts because it is the main support means for supporting heavy loads Compared with the case where it does, the manufacturing cost of the whole underfloor structure can be reduced significantly, and the underfloor structure with high cost performance can be obtained.

  Further, according to the configuration of the underfloor structure of the second invention of the present application, the seat plate of the intermediate vibration damping support means that sandwiches the elastic buffer between the floor slab and the bottom of the large pull beam through one shaft body. Because it is directly connected to the face plate so that its height can be adjusted, it is a general end that supports the left and right sides of the beam support seat via the shaft on each of the pair of left and right seat plates arranged on the left and right sides of the large pull beam. Compared with the part damping support means, the number of components is small, and the seat plate sandwiching the elastic buffer with the floor slab can be adjusted in height with respect to the large pull beam, although it can be implemented at low cost. Thus, even if the floor finishing slab has an uneven top surface and is uneven, the distance between the floor slab and the seat plate can be corrected to a predetermined value. Therefore, even when using a ready-made elastic shock absorber of a certain thickness, the elastic shock absorber is always interposed between the floor slab and the seat plate on the side of the draw beam with a predetermined compressive stress applied. , You can get the desired vibration control and sound insulation effect.

  Further, according to the configuration of the underfloor structure of the third invention of the present application, the support height of the floor plate body with respect to the floor slab is high, and when a predetermined large pull beam is used, the gap between the large pull beam and the floor slab is In a situation where the distance becomes large, the height of the intermediate damping support means becomes too large, or the thickness of the elastic buffer used becomes too thick. Therefore, the intermediate position of the large pull beam can be stably supported. In addition, it is possible to further improve the vibration suppression and sound insulation effects at the middle position of the large pull beam, or to increase the rigidity of the floor slab itself by utilizing the material characteristics of the large pull beam support base on the floor slab. .

  Furthermore, according to the structure of the underfloor structure of the fourth invention of the present application, the elastic buffer is arranged between the bottom plate of the large pull beam and the floor slab so as to be continuous over a predetermined section in the large pull beam length direction. As a result, a floor support structure having higher vibration damping performance and sound insulation effect than the first invention can be realized at low cost.

FIG. 1 is a partially cutaway perspective view showing a basic configuration of an underfloor structure. FIG. 2A is a partially cutaway vertical side view showing an embodiment of the first invention, and FIG. 2B is an enlarged detail view of a part thereof. FIG. 3 is a front view showing the end portion vibration damping support means of the embodiment. FIG. 4 is a longitudinal sectional front view showing details of the intermediate vibration damping support means of the embodiment. FIG. 5 is a cross-sectional plan view of the main part showing a first modification of the embodiment. FIG. 6 is a longitudinal sectional front view showing the first modified example. FIG. 7 is a longitudinal front view for explaining the implementation method of the first modified example. FIG. 8 is a longitudinal sectional side view showing a first stage of the implementation method in the second modification of the embodiment. FIG. 9 is a longitudinal front view showing the intermediate vibration damping support means finished by the implementation method in the second modified example. FIG. 10 is a longitudinal front view showing a third modification of the embodiment. FIG. 11 is a longitudinal front view showing a fourth modification of the embodiment. FIG. 12A is a partially cut-away vertical side view showing an embodiment of the second invention, and FIG. 12B is an enlarged detail view of an essential part thereof. FIG. 13: is a front view which shows the edge part damping support means of an Example same as the above. FIG. 14 is a longitudinal sectional front view showing the intermediate vibration damping support means of the embodiment. FIG. 15 is a partially cutaway longitudinal sectional side view showing an embodiment of the third invention. FIG. 16 is a longitudinal sectional front view showing the intermediate vibration damping support means of the embodiment. FIG. 17 is a longitudinal side view showing a first modification of the embodiment. FIG. 18 is a longitudinal sectional front view showing the intermediate vibration damping support means of the first modified example. FIG. 19A is a partially cutaway longitudinal side view showing a second modification of the embodiment, and FIG. 19B is a longitudinal front view showing the intermediate vibration damping support means. FIG. 20A is a partially cutaway longitudinal side view showing an embodiment of the fourth invention, FIG. 20B is an enlarged longitudinal front view thereof, and FIG. 20C is a longitudinal front view showing a first modification of this embodiment. FIG. 21A is a partially cut-away vertical side view showing a second modification of the embodiment, and FIG. 21B is an enlarged detailed view showing the main part thereof. FIG. 22 is a perspective view of the main part showing the end portion damping support means and the sub-beam mounting structure of the second modified example. FIG. 23 is a perspective view of an essential part showing a mounting structure of an elastic buffer for supporting a floor plate according to a second modified example of the same. FIG. 24 is a front view showing the end portion vibration damping support means of the second modified example. 25A to 25E are longitudinal sectional front views showing a plurality of usable pulling beams having different cross-sectional shapes together with end vibration damping support means.

  The embodiment of the first invention will be described with reference to FIGS. 1 to 4. The underfloor structure 1 is disposed between a floor slab 2 and a floor plate body 3, and includes a plurality of large pull beams 4, A plurality of sub-beams 5, an upper vibration isolation connection portion 6, and a lower vibration isolation connection portion 7 are configured. The large pull beam 4 is arranged parallel to each other on the floor slab 1, and the sub beam 5 connects adjacent large pull beams 4, and the large pull beam 4 is parallel to each other in a direction orthogonal to the large pull beam 4. Are arranged at appropriate intervals in the length direction.

  The large pull beam 4 is formed of a metal mold having a hollow rectangular (rectangular) cross section used in a direction in which the long side is vertical, and the right and left side plates 4a and 4b have concentric air circulation openings. 8 are provided at appropriate intervals in the lengthwise beam length direction. Further, a pair of left and right slits 9 for joining the sub beam 5 is provided at the shoulder portion of the large beam 4 in an inverted L shape from the top plate 4c to the side plates 4a and 4b at the shoulder portion. Yes. The large draw beam 4 is arranged so that both ends thereof are positioned on the beam portion 10 supporting the floor slab 1.

  The sub beam 5 may not need to be arranged depending on the arrangement interval of the large pull beam 4 or the placement load on the floor plate body 3. The sub beam 5 employed in this embodiment is made of a metal mold having a U-shaped cross section used in the downward opening direction, and a pair of left and right downward hooks 11 are integrally formed at both ends in the length direction. . The sub beam 5 is detachably coupled between the upper side portions of the large beam 4 by inserting a pair of left and right hooks 11 of the sub beam 5 into the pair of left and right slits 9 of the large beam 4 from above.

  A floor plate body 3 is laid on the upper surface plate 4 c of the large pull beam 4 via a band plate-like elastic buffer body 12 made of a vibration-proof rubber constituting the upper vibration insulating connection portion 6. The floor board 3 is made of a wooden base material (floor panels such as various veneer plywood and chip compression boards) 13 and a wooden floor material (flooring material such as solid board and decorative plywood) disposed thereon. 14 and. The elastic buffer 12 is bonded and bonded to the upper surface plate 4c of the large pull beam 4 on the flat lower surface, and is bonded to the floor plate 3 on the flat upper surface.

  The lower vibration isolation connecting portion 7 includes end vibration damping support means 15 and intermediate vibration damping support means 16 disposed between each large pull beam 2 and the floor slab 1. The end vibration damping support means 15 separately supports both ends in the length direction of the large pull beam 2 within the region supported by the beam portion 10 on the floor slab 1, and includes a beam support seat 17, A pair of left and right seat plates 18a and 18b, a pair of left and right shafts 19a and 19b that are erected on the respective seat plates 18a and 18b and located on the left and right sides of the large pull beam 2, the beam support seat 17 and the large pull beam 2 It comprises an elastic buffer 20 interposed between the bottom plate 4d and elastic buffers 21a and 21b interposed between the seat plates 18a and 18b and the floor slab 1. The beam support seat 17 is an inverted π-type having an upper open center recess 17a and left and right wing plate portions 17b, and the large pull beam 2 is inserted into the center recess 17a via the elastic buffer 20. The pair of left and right seat plates 18a and 18b fitted with elastic shock absorbers 21a and 21b on the lower surface thereof are placed on the floor slabs 1 on both the left and right sides of the bottom of the large pull beam 2 in the length direction. The beam support seat 17 is installed between a pair of upper and lower nuts 22a and 22b that are installed in a direction parallel to the large pull beam 4 and screwed into the shafts 19a and 19b projecting upward from the seat plates 18a and 18b. The beam support seat 17 is supported so as to sandwich the two blade plate portions 17b.

  As the elastic shock absorbers 20, 21a, 21b, in addition to molded products formed into a sheet or block shape with various elastic resins (including synthetic resins) having pressure resistance and vibration resistance, various elastic resins (synthetic resins can be used). In a predetermined space or by adhering to a predetermined surface.

  The seat plates 18a and 18b are π-types having a central convex portion with a lower release and left and right wing plate portions, and the shafts 19a and 19b are arranged at the center of the seat plates 18a and 18b. The center convex part of the seat plates 18a and 18b is composed of bolts penetrating upward into the convex part, and bolt heads 23a and 23b fitted into the central convex part and presser nuts 24a and 24b screwed into the bolt. The shafts 19a and 19b are configured by clamping and fixing the bolts to the seat plates 18a and 18b.

  The intermediate vibration damping support means 16 is constituted by an elastic buffer 25 provided between the floor slab 2 at positions at appropriate intervals in an intermediate region between both ends of the large pull beam 4. The elastic buffer 25 is formed by using an elastic resin filler 27 from a filling hole 26 provided in the bottom plate 4 d of the large pull beam 4 and a gap between the bottom plate 4 d of the large pull beam 4 and the floor slab 2. It is formed of an elastic resin injected into S, preferably various elastic resins (including a synthetic resin) having pressure resistance and vibration resistance. The intermediate vibration damping support means 16 arranged in the form of dots in the length direction of the large pull beam 4 leaves the floor plate body 3 while leaving a gap for air to flow between the large pull beam 4 and the floor slab 2. The vibration and noise transmitted to the floor slab 2 through the intermediate region in the longitudinal direction of the large pull beam 4 of the underfloor structure 1 can be absorbed, and the vibration control performance, sound insulation performance, and walking performance can be improved.

  Note that the air circulation openings 8 provided in the side plates 4a and 4b of the large pull beam 4 not only prevent harmful effects caused by the closed space between the large pull beams 4, but also for equipment piping and air conditioning. As shown in FIG. 4, when the large pull beam 4 has a hollow rectangular cross section, as shown in FIG. 4, an air circulation opening provided on the side surface of the large pull beam 4 8 and the position of the intermediate vibration damping support means 16 in the length direction of the large pull beam 4, the injection port of the elastic resin filler 27 inserted into the large pull beam 4 from the air circulation opening 8 is It can be configured such that it can be inserted into the filling hole 26 provided in the bottom plate 4d of the large pull beam 4.

  A modification of the embodiment of the first invention will be described with reference to FIGS. 5 to 7. On the outside of the bottom plate 4d of the large pull beam 4, there is an elasticity formed of a soft elastic material such as a sponge material of closed cells. The annular member 28 can be arranged substantially concentrically with the filling hole 26. This elastic annular member 28 may be bonded in advance to the outside of the bottom plate 4d of the large pull beam 4 before installation with an adhesive, or on the upper surface of the floor slab 2 in accordance with the installation position of the large pull beam 4. It may be bonded in advance, and the large pull beam 4 may be installed thereon.

  The elastic annular member 28 may be arranged by any method, but the elastic annular member 28 has a thickness that is moderately compressed between the bottom plate 4d of the large pull beam 4 and the floor slab 2. At the same time, the inner space is of such a size that it is not exposed to the outside of the large pull beam 4. Of course, the elastic annular member 28 may not be circular but may be non-circular, for example, a rectangular ring shape.

  If the elastic annular member 28 is provided as described above, the inlet of the elastic resin filler 27 inserted into the large draw beam 4 through the air circulation opening 8 is formed in the filling hole 26 as shown in FIG. The elastic resin for inserting and forming the elastic buffer body 25 by the elastic resin filler 27 can be injected into the inside of the elastic annular member 28. At this time, since both the upper and lower ring-shaped side surfaces of the elastic annular member 28 are in close contact with the bottom plate 4d of the large pull beam 4 and the upper surface of the floor slab 2, the elastic annular member 28 is bonded. The elastic resin injected into the inside of the elastic ring member 28 is surely filled in the entire inner space of the elastic annular member 28, and finally the elastic resin is injected from the filling hole 26 into the large pulling beam 4 to fill the filling hole 26. Can be closed.

  As described above, when the required curing (curing) time elapses while the elastic resin is filled inside the elastic annular member 28, the periphery is integrated with the elastic annular member 28, and the upper and lower surfaces are the large drawing beam 4. Thus, the elastic buffer 25 in a state of being bonded to the bottom plate 4d and the floor slab 2 is completed.

  As described above, when the elastic annular member 28 is disposed at a predetermined position on the floor slab 2 and placed so that the large pull beam 4 is placed thereon, the large pull member 28 As shown in FIG. 8, the bottom plate 4d of the beam 4 is not provided with a filling hole 26, and an elastic resin filler 27 is disposed inside an elastic annular member 28 disposed by adhering to a predetermined position on the floor slab 2, as shown in FIG. 9 is used to fill and fill the elastic resin, and then install the large pull beam 4 as shown in FIG. 9 and close the upper side of the elastic annular member 28 with the bottom plate 4d of the large pull beam 4. Is possible. In this case, the elastic resin injected into the elastic annular member 28 is slightly compressed together with the elastic annular member 28 by the bottom plate 4d of the large pulling beam 4 when the large pulling beam 4 is installed. The injection amount must be determined so as to be in close contact with the outer surface of the bottom plate 4d of the large pull beam 4.

  Further, as shown in FIG. 10, when the height of the large pull beam 4 with respect to the floor slab 2 is increased, the height of the gap between the floor slab 2 and the bottom plate 4d of the large pull beam 4 at that time is increased. The cylindrical elastic annular member 29 having a thickness (height) increased according to the thickness is used. In this case, the buckling strength of the cylindrical elastic annular member 29 is increased to improve the stability. Therefore, as shown in the drawing, it is desirable to form the outer appearance of the cylindrical elastic annular member 29 into a truncated cone shape whose outer diameter increases toward the lower end side. In this case, it is also effective to form the peripheral wall thicker toward the lower end side.

  As the large pull beam 4, a hollow rectangular cross-section of a square pipe shape is shown, but as will be described later, any cross-sectional shape may be used as long as it has a top plate 4c and a bottom plate 4d. In FIG. 11, as an example, a large pulling beam 4E having a Σ-shaped cross section having a vertical plate portion provided with an air circulation opening 8 in the center is used in the embodiment (modification) of the first invention. Indicates the state.

  Next, an embodiment of the second invention will be described with reference to FIGS. The difference between the embodiment of the second invention and the embodiment of the first invention described above is that the end damping support means for supporting both ends in the longitudinal direction of the large pull beam 4 and the large pull beam 4 It exists in the intermediate | middle vibration damping support means arrange | positioned in the intermediate area | region between both ends of a length direction. That is, the same reference numerals are given to the same components of the second embodiment and the first embodiment described above, and the description of the structure is omitted, but the second embodiment. As shown in FIG. 13, the end part damping support means 30 in FIG. 13 is the same as the end part damping support means 15 in the embodiment of the first invention as shown by the same reference numerals. The pair of left and right seat plates 18 a and 18 b are connected to each other by a connecting member 31 below the large pull beam 4.

  The connecting member 31 is fixed on the central convex portion of the pair of left and right seat plates 18a, 18b by using presser nuts 24a, 24b for fixing the shaft bodies 19a, 19b on the central convex portion of the seat plates 18a, 18b. Has been. In this way, the configuration in which the pair of left and right seat plates 18a and 18b are coupled by the coupling member 31 is a gate-shaped structure including the beam support seat 17, the pair of left and right shafts 19a and 19b, and the pair of left and right seat plates 18a and 18b. The end vibration damping support means 15 is replaced with the end vibration damping support means 30 having a rectangular frame structure by the connecting member 31, and the buckling strength is increased to enhance the load bearing performance. Therefore, the end vibration damping support means 30 of this rectangular frame structure is particularly suitable when the support height of the large pull beam 4 is increased as shown in the figure, or when the load on the floor plate 3 to be supported becomes heavy. It is effective in the case.

  Further, the intermediate vibration damping support means 32 in the second embodiment of the present invention is provided at appropriate intervals in the intermediate region between both ends of the large pulling beam 4 in the same manner as the intermediate vibration damping support means 16 in the first embodiment. Although it is arranged at a position, it is particularly suitable when the construction height of the large pull beam 4 on the floor slab 2 is increased. That is, the intermediate vibration damping support means 32 is provided on one seat plate 33 having the same structure as the seat plates 18a and 18b used for the end vibration damping support means 15 and 30, and on the central convex portion 33a of the seat plate 33. It is composed of one shaft body 34 erected vertically, and an elastic buffer 35 interposed between the left and right wing plate portions 33b of the central convex portion 33a of the seat plate 33 and the floor slab 2. ing.

  The shaft body 34 is composed of a bolt similar to the shaft bodies 19a and 19b of the end vibration damping support means 15 in the first embodiment of the present invention, and this bolt is passed through the central convex portion 33a of the seat plate 33 upward. Then, the central convex portion 33a of the seat plate 33 is sandwiched between the bolt head portion 34a fitted into the central convex portion 33a and the presser nut 36 screwed into the bolt, and the bolt is attached to the seat plate 33. The shaft body 34 is configured by fixing. Then, the shaft body 34 is passed through the bottom plate 4d of the large pull beam 4 upward, and the bottom plate 4d of the large pull beam 4 is sandwiched between a pair of upper and lower nuts 37 and 38 screwed into the shaft body 34. Accordingly, the intermediate vibration damping support means 32 is attached to the lower side of the large pulling beam 4 so that the left and right wing plate portions 33b of the seat plate 33 project to the left and right sides of the large pulling beam 4. At this time, the height of the seat plate 33 with respect to the floor slab 2 can be adjusted by adjusting the fastening height of the nuts 37 and 38.

  The elastic shock absorber 35 is connected to the blade plate through the filling holes 39 provided in the left and right blade portions 33b of the seat plate 33, like the elastic shock absorber 25 of the intermediate vibration damping support means 16 in the embodiment of the first invention. It can be formed by injecting elastic resin into the gap between the portion 33b and the floor slab 2 by using the elastic resin filler 27, but of course, the elastic buffer formed to a predetermined thickness 35 may be configured to be interposed between the left and right wing plate portions 33 b of the seat plate 33 and the floor slab 2. In this case, since the height of the seat plate 33 with respect to the floor slab 2 can be adjusted, the height of the gap between the left and right blade portions 33b of the seat plate 33 and the floor slab 2 caused by the horizontal accuracy of the upper surface of the floor slab 2 can be adjusted. Variations can be absorbed, and the large pull beam 4 can be reliably supported via the elastic buffer 35 formed to have a predetermined thickness. Moreover, even when the elastic shock absorber 35 is configured by any method, the seat plate 33 is attached in such a direction that the left and right wing plate portions 33b protrude from the left and right sides of the large pull beam 4, so that the operation can be easily performed.

  In the second embodiment of the present invention, a square pipe-shaped mold having a hollow rectangular cross section is used as the large pull beam 4, and the air flow opening 8 is provided in the side plates 4a and 4b of the large pull beam 4. 12, when the position of the air circulation opening 8 and the intermediate vibration damping support means 32 in the longitudinal direction of the large pull beam 4 is aligned, an intermediate position located inside the large pull beam 4 is obtained. It is desirable to configure the nut 37 of the vibration damping support means 32 so that it can be rotated from the outside of the large pull beam 4 using the air circulation opening 8.

  Next, an embodiment of the third invention will be described with reference to FIGS. 15 to 19. In this embodiment as well, the same components as those shown in the previous embodiment are denoted by the same reference numerals, and the description will be omitted. Omitted. In this embodiment, the end vibration suppression support means 30 or the end vibration suppression support means 15 of the previous embodiment is used as the end vibration suppression support means for supporting both ends of the pulling beam 4 in the length direction. However, the configuration of the end portion damping support means is not particularly limited. Further, the intermediate damping support means 40, 42, 45 used in this embodiment are arranged at one central position between both ends of the large pull beam 4. It may be arranged at a plurality of locations.

  The intermediate vibration damping support means 40 shown in FIGS. 15 and 16 is a large pull provided on the intermediate vibration damping support means 32 used in the embodiment of the second invention shown in FIG. 14 so as to protrude on the floor slab 2. The seat support 33 is configured to be combined with the beam support base 41 and is supported on the large pull beam support base 41 via the elastic buffer 35.

  The intermediate vibration damping support means 42 shown in FIG. 17 and FIG. 18 is provided on the end vibration damping support means 15 used in the embodiment of the first invention shown in FIG. The pulling beam support base 41 is configured in combination, and the seat plates 18a and 18b are supported on the large pull beam support base 41 via elastic buffer bodies 21a and 21b.

  The intermediate vibration damping support means 43 shown in FIG. 19 includes an inverted π-type seat plate 44 having a central concave portion 44a into which the large pull beam 4A is fitted, and a blade plate portion 44b projecting to the left and right sides thereof, and the seat plate. 44. The large pulling beam support base portions 41a and 41b divided on the left and right sides of the large pull beam 4A so as to support the left and right double blade portions 44b of the large pull beam 44A. Elastic buffer bodies 45a and 45b are interposed between the pull beam support base portions 41a and 41b, respectively. Further, an elastic buffer 45c is interposed between the central recess 44a of the seat plate 44 and the bottom plate 4d of the large pull beam 4A.

  As shown in FIGS. 15, 16, and 19, the large beam support base 41 constituting the intermediate vibration damping support means 40, 42, 43 has a required thickness on the floor slab 2. It can be constituted by the sound-insulating mat 46 placed thereon, or can be constituted by the increased concrete 47 as shown in FIGS. The increased-strength concrete 47 can be built by additional striking of the concrete when the floor slab 2 is constructed by concrete placement, but is constructed on the constructed floor slab 2 by extra striking of the concrete at an appropriate timing. You can also Also, the large beam support base 41 can be provided in an island shape only at the location where the intermediate vibration damping support means 40, 42 are disposed, but the direction perpendicular to the length direction of the large beam 4A. The large drawing beam support base 41 constituting the intermediate vibration damping support means 40, 42 of the other one or more large drawing beams 4A is formed into one continuous drawing. It is also possible to share the beam support base 41. In particular, when the large-drawing beam support base portion 41 that is continuous in a belt shape is constituted by the increased-strength concrete 47, it is useful for increasing the load bearing performance of the floor slab 2 itself. The large beam support base portions 41a and 41b constituting the intermediate vibration damping support means 43 may be continuously integrated between the adjacent large beam 4A.

  In the third embodiment of the present invention, the large draw beam 4A made of a mold material having a grooved cross section with a lip is exemplified as the large draw beam. However, the square draw pipe 4 having a hollow rectangular cross section may be used. good. In addition, the illustrated large drawing beam 4A is not shown with air circulation openings 8. Of course, the air circulation openings 8 are provided on the side plate of the large drawing beam 4A at appropriate intervals in the length direction. Is desirable.

  Next, an embodiment of the fourth invention will be described with reference to FIGS. 20 to 24. Also in this embodiment, the same reference numerals are given to the same components as those shown in the previous embodiment, and the description will be omitted. Omitted. In the embodiment of the fourth invention, the large pull beam 4 is arranged so as to be continuous over a predetermined section in the length direction in the belt-shaped gap S between the bottom plate 4d of the large pull beam 4 and the floor slab 2. An intermediate vibration damping support means 48 composed of an elastic buffer 49 is employed. 20 and 21, one elastic buffer 49 that is continuous over the entire intermediate region between both ends of the large pull beam 4 or a plurality of end surfaces that are butted so as to be continuous in the length direction of the large pull beam 4. The intermediate damping support means 48 is constituted by the elastic buffer 49, but the large drawing beam 4 leaves an air circulation gap of an appropriate length at one or a plurality of positions in the longitudinal direction of the large drawing beam 4. 4 may be the intermediate vibration damping support means 48 in which the elastic shock absorbers 49 are arranged in a plurality of sections in the length direction.

  The elastic buffer 49 may be configured by sandwiching a strip-shaped ready-made product of a predetermined thickness formed of an elastic synthetic resin in a belt-shaped gap S between the bottom plate 4d of the large pull beam 4 and the floor slab 2. However, an elastic resin can be injected into the belt-shaped gap S between the bottom plate 4d of the large pull beam 4 and the floor slab 2 by an elastic resin filler. In this case, as shown in FIG. 20C, an elastic resin is filled with elastic resin from the filling hole 26 provided in the bottom plate 4d of the large pull beam 4 in the vertical direction to the lower side of the bottom plate 4d of the large pull beam 4. 27 is preferably configured to inject. Further, as shown in FIGS. 20B and 20C, within the belt-like gap S between the bottom plate 4d of the large pull beam 4 and the floor slab 2, an appropriate interval is provided in the left-right width direction of the bottom plate 4d. A pair of left and right elastic rod-shaped members 50a and 50b can be arranged, and a region where the elastic resin is injected can be regulated between the pair of left and right elastic rod-shaped members 50a and 50b. When a pair of left and right elastic bar members 50a and 50b is used without providing the filling hole 26, an elastic resin is provided between the pair of left and right elastic bar members 50a and 50b installed by adhering to a predetermined position on the floor slab 2. And then the large draw beam 4 may be installed.

  In the embodiment shown in FIG. 20, the end vibration damping support means 15 having the same structure as the end vibration damping support means 15 employed in the embodiment of the first invention is used. In the illustrated embodiment, an end portion damping support composed of only an integrally molded product 51 made of a pressure-resistant elastic synthetic resin or the like is provided with a central recess 51a into which the large pull beam 4 is fitted and bottom portions 51b projecting on both left and right sides thereof. Means 52 are utilized. In FIG. 22, an elastic buffer 53 is interposed between the large beam 4 and the central recess 51a of the integrally molded product 51. However, depending on the physical properties of the integrally molded product 51, the elastic buffer 53 may be omitted. Is also possible.

  In all the embodiments of the first to fourth inventions, an elastic buffer 12 is interposed between the upper plate 4c and the floor plate 3 of the large pull beam 4 as the upper vibration isolation connecting portion 6. However, when a strip-shaped molded product is employed as the elastic buffer body 12, as shown in FIGS. 22 to 24, the upper surface plate 4c of the large pull beam 4 has a protrusion that continues in the length direction of the large pull beam. The elastic buffer body 12 is integrally formed, and the elastic buffer body 12 is integrally formed with the concave groove portion 55 that is externally fitted to the protruding portion 54, so that the elastic buffer body 12 is not bonded onto the pulling beam 4. In addition, even if they are bonded, even if the bonding is insufficient, the lateral displacement can be reliably prevented.

  When the sub beam 5 is installed between the large pulling beams 4 according to the arrangement interval of the large pulling beams 4 and the loading load on the floor plate body 3, it is made of a metal mold having a U-shaped cross section used in the downward opening direction. The sub beam 5 is a sub beam 5 which is detachably connected between the upper side portions of the large beam 4 by inserting a pair of left and right hooks 11 of the sub beam 5 into the pair of left and right slits 9 of the large beam 4 from above. However, the sub-beam 5 may have any cross-sectional shape similar to the cross-sectional shape of the large pull beam 4 described later, and the mounting structure for the large pull beam 4 at both ends thereof may be used. The structure using the slit 9 and the hook 11 is not limited. When the sub beam 5 is installed between the large beam 4, an elastic buffer is mounted on the upper surface of the sub beam 5, and the elastic buffer on the sub beam 5 and the upper plate 4 c of the large beam 4 are mounted. The floor board 3 can be supported by the elastic buffer 12. When the sub-beam 5 is configured to support the floor plate body 3 in this way, the floor plate body 3 is configured by increasing the number of the sub-beams 5 and narrowing the distance between the sub-beams 5 in the length direction of the extended beam 4. It is also possible to omit the base material 13 and lay the floor surface material 14 directly on the underfloor structure 1.

  In addition to the large drawing beam 4 using the square pipe-shaped mold material having the hollow rectangular cross section shown in the embodiment, the large drawing beam 4A and FIG. The large drawing beam 4B using a mold material having a lipless groove-shaped cross section shown in FIG. 25, the large drawing beam 4C using a mold material having an H-shaped cross section shown in FIG. 25C, and the central portions of the left and right side plates shown in FIG. All cross sections with top and bottom plates, such as a large draw beam 4D using a deformed hollow rectangular cross section mold, a large draw beam 4E using a Σ-shaped cross section with a vertical plate at the center A shaped mold can be used as a large beam. And it is desirable to provide the air flow opening 8 that allows the left and right sides to communicate with each other regardless of the cross-sectional shape. In FIG. 25, the end vibration damping support means 30 including the connecting member 31 is illustrated as the end vibration damping support means for supporting the end of the large pull beam. Of course, the means 15 and 52 may be sufficient.

  Further, as end vibration damping support means for supporting both ends of the large pull beam 4, a plurality of end vibration suppression support means 15, 30, 52 having different structures are illustrated, and an intermediate region of the large pull beam 4 is supported. As the intermediate vibration damping support means, a plurality of intermediate vibration damping support means 16, 32, 40, 42, 43, and 48 having different structures are exemplified, but the combination of the end vibration damping support means and the intermediate vibration damping support means is: It is not limited to the combination shown in the Example, It can implement by changing a combination arbitrarily.

  The underfloor structure of the present invention, when a floor slab is supported on a floor slab having a regular beam structure in a concrete building, is interposed between the floor slab and the floor slab to provide a damping effect, a sound insulation effect, and a floor surface. It can be used as an underfloor structure that can enhance walking comfort.

DESCRIPTION OF SYMBOLS 1 Underfloor structure 2 Floor slab 3 Floor plate body 4, 4A-4E Large pull beam 4a, 4b Both left and right side plates of large pull beam 4c Top plate of large pull beam 4d Bottom plate of large pull beam 5 Sub beam 6 Upper vibration insulation connection part 7 Lower vibration isolation connection 8 Air flow opening 12 Elastic shock absorber 13 Base material of floor plate body 14 Floor surface material of floor plate body 15, 30, 52 End vibration damping support means 16, 32, 40, 42, 43, 48 Intermediate vibration damping support means 17 Beam support seats 18a, 18b, 33, 44 Seat plates 19a, 19b, 34 Shaft bodies 20, 21a, 21b, 25, 35, 45a to 45c, 49, 53 Elastic buffer bodies 26, 39 Filling Hole 27 Elastic resin filler 28, 29 Elastic annular member 31 Connecting member 41 Large draw beam support base 46 Sound insulation mat 47 Additional concrete 50a, 50b Elastic rod member 51 One Molded product

Claims (23)

  An underfloor structure disposed between a floor slab and a floor plate body, with a large pull beam arranged in parallel at appropriate intervals, and an end damping that supports both ends in the length direction of the large pull beam In the underfloor structure provided with a support means and an intermediate vibration suppression support means for supporting an intermediate region between both ends of the large pull beam, the intermediate vibration suppression support means is provided between the bottom plate of the large pull beam and the floor slab. The elastic buffer is provided in an air gap formed between the bottom plate of the extended beam and the floor slab by the support of both ends of the extended beam by the end vibration damping support means. An underfloor structure formed of an injected elastic resin.   The underfloor structure according to claim 1, wherein a bottom hole plate of the large pull beam is provided with a filling hole for injecting the elastic resin in the vertical direction in accordance with the position of the intermediate vibration damping support means. body.   The large draw beam has a hollow rectangular cross section, and the side plate of the large draw beam is provided with air circulation openings at appropriate intervals in the length direction of the large draw beam, and an elastic resin to the filling hole. The underfloor structure according to claim 2, which is configured to be able to perform injection of air through the air circulation opening located above the filling hole.   The intermediate vibration damping support means includes an elastic annular member sandwiched between a bottom plate of a large pull beam and a floor slab, and the elastic resin is injected inside the elastic annular member. The underfloor structure according to any one of the above.   5. The underfloor structure according to claim 4, wherein an outer shape of the elastic annular member is a truncated cone shape whose outer diameter increases toward the floor slab side.   An underfloor structure disposed between a floor slab and a floor plate body, with a large pull beam arranged in parallel at appropriate intervals, and an end damping that supports both ends in the length direction of the large pull beam In the underfloor structure comprising support means and intermediate vibration suppression support means for supporting an intermediate region between both ends of the large pull beam, the intermediate vibration support means is disposed on the floor slab below the large pull beam. A seat plate, a single shaft body connecting the seat plate and the bottom plate of the draw beam, and an elastic buffer member interposed between the seat plate and the floor slab, The underfloor structure is attached to the bottom plate of the large beam so as to be adjustable in height.   The seat plate includes a central convex portion that protrudes in a convex shape at the center upper side, and the wing plate portions on both sides of the central convex portion are made of a large pull beam by the shaft body projecting on the central convex portion. 7. The seat plate according to claim 6, wherein the seat plate is attached to the lower side of the large pull beam so as to project to both the left and right sides, and the elastic buffer is disposed on the lower side of the left and right wing plate portions of the seat plate. Underfloor structure.   The underfloor structure according to claim 7, wherein left and right wing plate portions of the seat plate are provided with filling holes penetrating in the vertical direction, and the elastic buffer body is formed by an elastic resin injected from the filling holes. body.   The large drawing beam has a hollow rectangular cross section, and the side plate of the large drawing beam is provided with air circulation openings at appropriate intervals in the length direction of the large drawing beam, and the shaft body has a lower end. A pair of upper and lower nuts that are fixed to the seat plate and vertically penetrate the bottom plate of the large pulling beam and are screwed to the shaft body so that the vertical position of the large pulling beam can be adjusted, and sandwich the bottom plate of the large pulling beam from above and below. The underfloor structure according to any one of claims 6 to 8, wherein a height adjustment of the nut inside the large pull beam among the pair of upper and lower nuts can be adjusted through the air circulation opening. body.   An underfloor structure disposed between a floor slab and a floor plate body, with a large pull beam arranged in parallel at appropriate intervals, and an end damping that supports both ends in the length direction of the large pull beam In the underfloor structure provided with a support means and an intermediate vibration suppression support means for supporting an intermediate region between both ends of the large pull beam, the intermediate vibration suppression support means includes a seat plate for supporting the large pull beam, and a floor slab. An underfloor structure comprising: a large beam support base provided so as to protrude from the base plate, and an elastic buffer interposed between the seat plate and the large beam support base.   The underfloor structure according to claim 10, wherein the large beam support base is formed of a sound insulation mat placed on a floor slab.   The underfloor structure according to claim 10, wherein the large draw beam support base is formed of increased concrete formed on a floor slab.   The underfloor structure according to any one of claims 10 to 12, wherein the seat plate supports the pulling beam via a shaft body that is attached to a bottom plate of the pulling beam so as to be adjustable in height. .   The seat plate supports the large pull beam via a beam support seat that supports the large pull beam and a pair of left and right shafts that are attached to the beam support seat on both the left and right sides of the large pull beam. The underfloor structure according to any one of claims 10 to 12.   The platform for supporting the large beam is divided into right and left at the position of the large beam, and the seat plate includes a central recess into which the large beam is fitted and a wing plate portion projecting on both sides. The left and right wing plate portions of the plate are supported via elastic cushioning bodies on the large drawing beam support bases divided on the left and right sides of the large drawing beam, respectively. The underfloor structure according to item.   An underfloor structure disposed between a floor slab and a floor plate body, with a large pull beam arranged in parallel at appropriate intervals, and an end damping that supports both ends in the length direction of the large pull beam In the underfloor structure provided with a supporting means and an intermediate vibration damping supporting means for supporting an intermediate region between both ends of the large pulling beam, the intermediate vibration supporting support means is provided between the bottom plate of the large pulling beam and the floor slab. An underfloor structure configured from an elastic buffer disposed so as to be continuous in a belt-shaped gap over a predetermined section in the lengthwise beam length direction.   The elastic buffer is formed of an elastic resin injected into a band-shaped gap between the bottom plate of the large beam and the floor slab from a filling hole provided in the bottom plate of the large beam and penetrating in the vertical direction. The underfloor structure according to claim 16.   A pair of left and right elastic rod-like members are arranged in the belt-like gap between the bottom plate of the large pull beam and the floor slab with an appropriate interval in the left-right width direction of the bottom plate. The underfloor structure according to claim 16 or 17, which is formed of an elastic resin injected between a pair of elastic rod-shaped members.   The end vibration damping support means has a beam support seat provided with a central recess into which a large pull beam is fitted, and blade plates projecting on the left and right sides thereof, and the height of the beam support seat on both right and left blade plates is adjustable. A pair of left and right shafts attached to each other, a pair of left and right seats connected to the lower ends of the shafts, and an elastic buffer interposed between each seat plate and the floor slab, The underfloor structure according to any one of claims 1 to 18, wherein the pair of left and right seat plates are connected to each other by a connecting member below the large pull beam.   The underfloor structure according to any one of claims 1 to 18, wherein the end vibration damping support means is formed of an integrally molded product having a central recess into which a large pull beam is fitted and bottom portions projecting on both right and left sides. body.   The underfloor structure according to any one of claims 1 to 19, wherein an elastic buffer is interposed between the large pull beam and the floor plate placed and supported thereon.   The upper surface plate of the large pull beam is provided with a ridge portion that is continuous in the length direction of the large pull beam, and the elastic buffer body is formed with a concave groove portion that fits outside the ridge portion. The underfloor structure according to 21.   Between adjacent large beams, sub beams oriented in the direction perpendicular to the large beam are installed at appropriate intervals in the large beam length direction. Inverted L-shaped slits are provided, and hooks are provided at both ends of the sub beam to be inserted and engaged with the slits downward from above. The underfloor structure according to any one of 1 to 19, which is supported on the floor.

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