JP2006183432A - Floor support structure in building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance ventilation performance of an undefloor space and a degree of freedom of laying-around of a pipe, by effectively restraining and damping vertical vibration of a floor structure, while improving sound insulating performance, in a building having a concrete skeleton of a regular-beam structure. <P>SOLUTION: A sleeper beam 5 being a support member of a floorboard 7 of a floor structure Fr, is arranged in close vicinity to a floor slab so that clearance D1 exists between the beam and the floor slab Sf. An end part of these sleeper beams 5 is arranged so that clearance D2 exists between vertical skeleton parts or between the other sleeper beams. Its respective sleeper beams 5 are supported via an elastic body on an upper surface of a regular-beam corresponding part of the floor slab. A vibration control device T is interposed between the floor slab Sf and an intermediate part in the longitudinal direction of the respective sleeper beams 5. A pipe inserting through-hole is also formed in the respective sleeper beams 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a floor support structure in a building, and more particularly, to a floor support structure in a building having a concrete frame of a regular beam structure in which a floor slab is connected to the upper surface of a beam.

  Generally in condominiums such as condominiums, the floor structure is fixedly connected to the floor slab of a concrete frame via bundles (posts) erected on the floor slab. There is a problem in that sound is transmitted as vibration noise from the floor structure to the upper and lower floors and the left and right adjacent rooms, causing deterioration of the environment of the living space and deterioration of quality.

  In particular, due to changes in lifestyles, the number of Japanese-style rooms has decreased, and Western-style rooms have also seen changes in residents' needs from carpet floors that function as cushioning materials to flooring floors that are unlikely to be cushioning materials. There is a tendency for vibration noise transmitted from the upper and lower floors to the left and right adjacent rooms to become larger, and as measures against sound insulation, measures such as increasing the thickness of the floor slab and making the floor structure itself a sound insulation structure are taken. However, even if such sound insulation measures are taken, it is impossible to avoid fixing and contact between the floor structure and the concrete frame, especially the floor slab, and even if the propagation of vibration noise can be reduced, drastic sound insulation There is a problem that it is not a countermeasure, and there is another problem that the construction cost is greatly increased.

  In addition, if the floor structure is supported by standing a bundle on the floor slab as described above, the floor surface becomes higher by that amount. Therefore, especially when the thickness of the floor slab is increased as described above, the entire structure is considerably increased. There is also a problem that the height of the building becomes high and the height of the building becomes high.

Therefore, in order to solve the above problem, the present inventor does not support the plurality of large drawing beams constituting the floor structure via the bundle, and both ends in the longitudinal direction between the vertical frame wall and the vertical frame wall. In such a manner that both ends of the pulling beam are floatingly supported on the vertical housing wall so as to be placed on an upward support surface provided on the vertical housing wall via an elastic body. In addition, there has already been proposed an improved technique in which the frame and the floor structure are insulated so that the sound insulation effect can be enhanced while achieving stable support of the floor structure (see FIG. 9 and FIG. 9 of Patent Document 1 below). 10).
JP 2003-155798 A

  However, with this improved technology, when the span of the large beam supported on both ends of the vertical frame wall is long, the beam middle part is easily deformed up and down when a downward impact load is applied to it. When the impact load is repeated intermittently, the vertical vibration of the beam is amplified, and the occupants on the floor board are greatly shaken, which may cause discomfort similar to seasickness.

  In addition, the large draw beam is not supported through the bundle, and the lower end of the large draw beam is close to the upper surface of the floor slab and the gap between the beam and the floor slab is small, so that it is partitioned by the large draw beam. In addition, the air permeability of the individual space areas under the floor is poor, and there is also a problem that a large pull beam becomes an obstacle when pipes such as water pipes, sewer pipes, and electric pipes are routed in various places in the underfloor space.

  The present invention has been proposed in view of the above, and it is an object of the present invention to provide a floor support structure in a new building that can solve the problem all at once while taking advantage of the improved technology.

  In order to achieve the above object, a first aspect of the present invention is a concrete frame comprising a plurality of horizontal frame parts each having a floor slab for partitioning a living space up and down, and a vertical frame part connecting the upper and lower horizontal frame parts. In a building having a regular beam structure in which the floor slab is connected to the upper surface of the beam, the floor structure of the living space is arranged with a plurality of large-drawing beams arranged on a plane with a space between each other, A plurality of large-drawn beams are arranged close to the floor slab with a vertical gap between the floor slabs and the large-drawn beams. Ends are arranged with a horizontal gap between the vertical frame part or other adjacent large beam, each large beam corresponding to the beam of the floor slab Supported by an elastic body on the upper surface of the part, floor slab and Between the longitudinally intermediate portion of the large pulling beam, when the beam receives a downward impact load, at least one that suppresses the vertical vibration of the beam while preventing the impact load from being transmitted to the floor slab. A vibration control device is interposed, and each large beam is further provided with a through-hole through which a pipe routed in the underfloor space between the lower surface of the floor plate and the upper surface of the floor slab is formed. And

  Further, the invention of claim 2 is characterized in that, in addition to the feature of claim 1, when the vibration control device attempts to vibrate each large pulling beam up and down by the impact load, The invention is characterized by comprising a tensile load applying mechanism that applies a downward tensile load to the beam intermediate portion so that upward displacement can be suppressed, and the invention of claim 3 is the invention of claim 1 or 2. In addition to the characteristics, a longitudinally intermediate portion of the plurality of large-drawing beams parallel to each other is connected with a connecting rod that extends over and connects between them. The vibration control device and the large pull beam are connected to each other.

  Furthermore, the invention of claim 4 is formed in addition to the above feature of claim 1, 2 or 3 between the end of the large draw beam and another vertical draw beam between the vertical housing portion or the adjacent large draw beam. A pipe routed through the underfloor space is passed through at least one of the horizontal gaps.

  As described above, according to the present invention, the floor structure and the concrete frame are insulated (that is, their direct contact is avoided), and the vibration noise generated in the floor structure can be propagated to the upper and lower floors and the left and right adjacent rooms. And the sound insulation effect can be improved. In particular, the vibration noise applied to the floor structure is supported by floating support at both ends of the plurality of large beams constituting the floor structure via the elastic body on the corresponding portion of the floor slab. The sound insulation effect can be enhanced by being distributed and propagated to the solid beam portion of the horizontal frame wall through the. Furthermore, since the floor slab does not need to have a sufficient sound insulation function, the floor slab can be made as thin as possible to increase the effective height of the living space, and the weight of the concrete frame can be reduced to reduce costs. Seismic performance can be improved while saving.

  In addition, when the large span beam is subjected to a downward impact load at the middle part in the longitudinal direction, the impact load is transmitted to the floor slab by a special damping device between the floor slab and the beam middle part. Therefore, even when the impact load is intermittently repeated, the vertical vibration of the beam is amplified and a resident on the floor board is greatly shaken. There is no such worry and the comfort is further improved. Furthermore, since a through hole for inserting a pipe is specially formed in each large pull beam, even if the gap between the lower end of the beam and the floor slab is reduced due to the large pull beam being arranged close to the upper surface of the floor slab, The above-mentioned through-holes that are relatively large for the insertion of pipes can improve the air permeability of the individual space areas under the floor that are partitioned by the large pull beam, and in addition, water pipes and sewage pipes are provided at various locations in the under-floor space. When a pipe such as a conduit pipe is routed, the pipe passes through the through hole, so that there is no possibility that the large pull beam interferes with the piping and the degree of freedom of the piping can be increased.

  In particular, according to the invention of claim 2, when the tension load applying mechanism as the vibration damping device attempts to vibrate each large pulling beam up and down by the impact load, the upward displacement from the stationary position of the beam intermediate portion is performed. Since a downward tensile load is applied to the beam intermediate part so that it can be suppressed, the vertical vibration of the beam due to the impact load is relatively simple with only a predetermined tensile load applied to the beam intermediate part. Can be effectively suppressed and attenuated, and vibration amplification can be effectively prevented.

  In particular, according to the invention of claim 3, a connecting rod that extends over and connects between the longitudinally intermediate portions of the plurality of large beams is coupled to the connecting rod. Since the vibration control device and the large pull beam are connected to each other, a common vibration control device can be used for a plurality of large pull beams, and the structure can be simplified. Even if a sufficient vertical clearance is not ensured between the lower end of the beam and the floor slab due to the close arrangement on the upper surface, the vibration control device can be installed without difficulty at a position off from directly below the large pulling beam. .

  In particular, according to the invention of claim 4, at least one of the horizontal gaps formed between the end portion of the large draw beam and the vertical frame portion or another adjacent large draw beam is below the floor. Since the pipe routed through the space is passed, even if the gap between the lower end of the beam and the floor slab becomes smaller due to the close-up beam placed close to the upper surface of the floor slab, the horizontal direction is relatively large. Due to the gap, it is possible to improve the air permeability of the individual space areas under the floor partitioned by the draw beam, and in addition, when piping pipes such as water pipes, sewage pipes, electric pipes etc. in various places in the underfloor space However, by passing through the relatively large gap in the horizontal direction, there is no possibility that the large-draw beam interferes with the piping, and the degree of freedom of the piping can be further increased.

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

  1 to 8 show a first embodiment of the present invention. FIG. 1 is a plan sectional view of a part of an apartment house provided with the floor support structure of the present invention, and FIG. FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1, FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1, and FIG. 5 is an enlarged view showing a part taken along the arrow 5 in FIG. 3, FIG. 6 is an enlarged sectional view taken along line 6-5 in FIG. 5, and FIG. 7 is an enlarged perspective view of a support seat with respect to the draw beam. FIG. 8 is an enlarged perspective view of the vibration damping device (tensile load applying mechanism). 9 and 10 show a second embodiment of the present invention. FIG. 9 is a sectional view corresponding to FIG. 1, and FIG. 10 is an enlarged sectional view taken along line 10-10 of FIG.

  First, in FIGS. 1 to 4 showing the first embodiment, a concrete frame F having a regular beam structure constituting a skeleton of an apartment house extends in the horizontal direction and divides the building into a plurality of levels, which is a horizontal frame portion Fh. And a vertical housing portion Fv that extends in the vertical direction and connects the upper and lower horizontal housing portions Fh to each other.

  The horizontal frame portion Fh includes a floor slab Sf that divides the living space Dw up and down, and the floor slab Sf includes a large-size beam Bb having a rectangular shape in plan view corresponding to the outer periphery of an area corresponding to one house, A plurality of linear small beams Ba that connect a pair of opposing long side portions of the regular large beam Bb are integrally projected downward to form a so-called “normal beam structure”. The portion Sfo extending to the veranda side of the floor slab Sf constitutes the floor portion of the veranda, and the portion Sfi extending to the corridor side of the floor slab Sf constitutes the floor portion of the corridor. In FIGS. 3 and 4, symbol W denotes a sash that opens and closes the sweeper window on the veranda side.

  Moreover, the said vertical frame part Fv is equipped with the vertical column 1 and the vertical vertical wall 2 and 3 which connect the vertical column 1 connected to the parallel horizontal column 1 in the four corners of the living space Dw for one house. .

  On the floor slab Sf corresponding to the living space Dw for one house in each floor, a plurality of floor structures Fr are arranged corresponding to the rooms of the living space Dw. The floor structure Fr has basically the same structure at each level.

  Next, one floor structure Fr will be described with reference to FIGS. 5 to 8. The floor structure Fr is prevented from being brought into direct contact with the concrete frame F as will be described later. Floating is supported on the floor slab Sf of the frame F.

  That is, on the floor slab Sf of the living space Dw, a plurality of large drawing beams 5... Arranged in parallel with each other on one plane and arranged in tandem with each other in the longitudinal direction are arranged in the vertical direction. It is provided with a gap D1. These large draw beams 5 are the main strength members of the floor structure Fr, and are formed by bending a steel plate into a cross section Σ shape, and are lightweight while ensuring sufficient rigidity. . Further, a floor support plate 6 such as a particle board is laid on the plurality of large beams 5, and a floor plate 7 made of a flooring material or the like is further laid on the floor support plate 6.

  Each large beam 5 is formed to have a length substantially equal to the interval between the major beam Bb and the minor beam Ba parallel to each other or the interval between the minor beams Ba and Ba adjacent to each other. And the edge part of each large drawing beam 5 is arrange | positioned at the upper surface side of the part corresponding to either the regular large beam Bb or the regular small beam Ba of the floor slab Sf, and the vibration isolating rubber as an elastic body on the upper surface 8 is supported floating. That is, the receiving frame 10 is adjusted in position via a pair of upper and lower nuts 11 on the level adjustment bolt 9 that is integrally provided on the upper surface of the portion of the floor slab Sf corresponding to the regular beam Bb or the regular beam Ba. The anti-vibration rubber 8 is fixed and supported on the receiving frame 10, and the lower frame 5 d of the large pull beam 5 is placed and supported on the anti-vibration rubber 8. In this placement support state, each large draw beam 5 is disposed close to the floor slab Sf with a vertical gap D1 between the large draw beam 5 and the end of the large draw beam Sf. Are disposed between the facing surfaces of the end portion and the vertical frame portion Fv or between the facing surfaces of the adjacent adjacent end portions of the large beam 5 with horizontal gaps D2 and D2 ′. The

  Each large beam 5 has various pipes L (for example, water pipes, sewer pipes, electric pipes, telephone lines) routed in the underfloor space C between the lower surface of the floor support plate 6 and the upper surface of the floor slab Sf. A plurality of through-holes 5h formed relatively large for passing air conditioning pipes, etc., are provided at intervals, and the through-holes 5h also serve as vent holes. According to the special provision of the through hole 5h for inserting the pipe, even if the large drawing beam 5 is arranged close to the upper surface of the floor slab Sf as described above, each of the underfloor spaces C partitioned by the beam 5 is provided. The air permeability of the space area can be improved, and in addition, the layout and the degree of freedom in handling the various pipes L are increased in various places in the underfloor space C, and the large pull beam 5 obstructs the pipes. There is no fear.

  Further, when the beam 5 receives a downward impact load via the floor plate 7 between the floor slab Sf and the longitudinal intermediate portion (in the illustrated example, the center portion) of each large pull beam 5, the impact load is reduced. A vibration damping device that suppresses the vertical vibration of the beam 5 while preventing transmission to the floor slab Sf is interposed.

  As the vibration control device, in the illustrated example, when each large pulling beam 5 tries to vibrate up and down due to the impact load, the beam 5 can be restrained from being displaced upward from a stationary position at the center of the beam 5. A tensile load applying mechanism T for applying a downward tensile load to the central portion is used, and the configuration of the mechanism T will be specifically described mainly with reference to FIGS. The solid line in FIG. 6 indicates the stationary state of the large pull beam 5, and the chain line indicates the moment when the central portion of the large pull beam 5 undergoes a downward impact load and is slightly elastically deformed downward.

  That is, the tensile load applying mechanism T includes a lower channel member 22 having a U-shaped cross section that is fixed to the floor slab Sf by an anchor 20 and a nut 21 that is screwed and fastened thereto, and an upper frame of the lower channel member 22. An upper channel member 23 having a U-shaped cross-section in which a lower frame 23d engages with 22u from below via an anti-vibration rubber 24, and between the upper frame 23u of the upper channel member 23 and the upper wall 5u of the pull beam 5 The anti-vibration rubber 24 is bonded to one of the upper frame 22u and the lower frame 23d, and is connected to and separated from the other. It can contact freely.

  The connecting means J extends so as to straddle the central portions of the plurality of parallel large beam 5 and connects the central portions via screws, and the connecting rod 30. The upper part of the large pulling beam 5 group connected at the center is screwed into the lower frame 30d of the connecting rod 30 between the two large pulling beams 5 and 5 on the center side, and the lower part is connected to the upper frame 23u of the upper channel member 23. The relative height between the connecting bolt 25 for loosely inserting the bolt, the lock nut 26 for fixing the screwed position of the bolt 25 with the connecting rod 30 and the bolt 25 of the upper frame 23u (accordingly, the upper channel member 23). The adjustment nut 27 that is screwed into the bolt 25 and engages the upper frame 23u from the lower side so that the level, and hence the tensile load described later) can be adjusted, and the screw position of the nut 27 with the bolt 25 Lock nut 28 for fixing More composed. The floor support plate 6 has a discontinuous portion corresponding to the connection rod 30 in order to avoid interference with the connection rod 30, but the floor support plate 6 is thick or the connection rod 30 is relatively small. In this case, a recess for accommodating the connecting rod 30 may be provided in the floor support plate 6.

  Thus, when the tensile load applying mechanism T is assembled, for example, the lower channel member 22 is fixed to the floor slab Sf in advance, and the central portions of the plurality of large pull beams 5 are connected to each other via the connecting rods 30. The connecting bolt 25 is screwed into the lower frame 30 d of the connecting rod 30, and then the lower part of the connecting bolt 25 is inserted into the upper frame 23 u of the upper channel member 23 and the lower frame 23 d is inserted into the lower channel member 22. The adjustment nut 27 is tightened to the connecting bolt 25 so that the upper frame 23u of the upper channel member 23 is pulled up and engaged with the upper frame 22u via the vibration isolating rubber 24. Further, the tightening position is locked to the lock nut 28. By fixing with, the vibration isolating rubber 24 is compressed between the upper and lower channel members 22 and 23 so as to be compressed and deformed. It applies a predetermined tensile load to the central unit.

  Next, the operation of the embodiment will be described. In this embodiment, in the living space Dw, both ends of the plurality of large pull beams 5... That are the main strength members of the floor structure Fr are respectively floating supported by the floor slab Sf of the concrete frame F via the vibration isolating rubber 8. In this state, the floor structure Fr, particularly the plurality of large beams 5... Avoids direct contact with the floor slab Sf of the concrete frame F and the vertical frame wall Fv. Propagation of vibration noise to can be effectively reduced.

  In particular, as shown in the illustrated example, when the end portions of the large pull beams 5 are supported via the anti-vibration rubber 8 on the portions corresponding to the large beam Bb or the small beam Ba of the horizontal frame wall Fh, the floor structure Fr. The vibration noise applied to is distributed and propagated through the beam 5 to the sturdy straight beam portion of the horizontal enclosure wall Fh, and further dispersed and propagated in the vertical and lateral directions of the vertical enclosure walls 2 and 2 from there. The effect can be enhanced. Therefore, since the floor slab Sf does not need to be formed to be particularly thick for the sound insulation measure, the indoor height of the living space Dw can be increased accordingly, and the weight of the concrete frame F can be increased. The seismic performance can be improved.

  By the way, the floor structure Fr including the large pull beam 5 may be affected by not only a small impact load due to a child's rampage on the floor structure Fr. The middle part receives a downward impact load and tries to vibrate up and down according to the strength of the impact. In particular, when the impact load is intermittently repeated, in the floor support structure in which the vibration damping device (tensile load applying mechanism T) is not provided, the large pull beam is generated every time the impact load is repeated. There is a possibility that the amplitude of the up-and-down vibration of 5 will gradually increase, shaking the occupants on the floor board 7 greatly, and causing discomfort similar to seasickness.

  However, in this embodiment, the tensile load applying mechanism T specially provided between the floor slab Sf and the central portion of the large pull beam 5 prevents the impact load from being transmitted to the floor slab Sf, and the vertical vibration of the beam 5 is prevented. Can be suppressed. That is, the tensile load applying mechanism T is directed downward with respect to the center of the beam so that the large pulling beam 5 is able to suppress upward displacement from the stationary position of the center of the beam when the large pulling beam 5 tries to vibrate up and down by the impact load. Since the tensile load is applied, the vertical vibration of the large pull beam 5 due to the impact load can be effectively suppressed with a relatively simple structure, and the increase in the amplitude can be effectively prevented beforehand.

  In this case, at the moment when the impact load is applied to the central portion of the beam, the central portion of the beam is slightly elastically deformed downward, and accordingly, the anti-vibration rubber 24 between the upper and lower channel members 22 and 23 is provided. Is temporarily disengaged (that is, the rubber 24 is once separated from the upper frame 22u of the lower channel member 22 as shown by the chain line in FIG. 6), and the impact load is transmitted to the floor slab Sf side. Then, the center of the beam is vigorously displaced further upward than the rest position by the reaction, but the vibration displacement is effectively suppressed by compressing the vibration isolating rubber 24 functioning as a damper rubber. As a result, the vertical vibration of the large beam 5 is effectively and quickly converged. Therefore, the bending deformation of the central portion of the beam is suppressed to the extent that the upper limit is the stationary position or a position slightly above the stationary position.

  Thus, even when the impact load is repeated intermittently, it is possible to effectively prevent the vertical vibration of the large pull beam 5 from being amplified, and the occupants on the floor board 7 are greatly shaken by the vibration amplification. There is no need to worry about being overwhelmed, and comfort is further improved. Further, the tensile load applying mechanism T as a vibration damping device has a relatively simple structure in which a predetermined tensile load is applied to the central portion of the beam as described above. It can be effectively suppressed and attenuated, and its amplitude increase can be effectively suppressed.

  9 and 10 show a second embodiment of the present invention. In the second embodiment, the end portion of the large pull beam Sf is horizontally between the facing surface between the end portion and the vertical housing portion Fv, or between the facing surfaces with the adjacent end portions of other adjacent large pulling beams 5. The gaps D2 and D2 ′ having a relatively large direction (that is, larger than the first embodiment) are disposed, and at least a part of the gaps D2 and D2 ′ is routed to the underfloor space C. Various pipes L (for example, water pipes, sewer pipes, electric pipes, telephone lines, air conditioning pipes, etc.) are passed.

  According to the second embodiment, even when the gap D1 between the lower end of the beam 5 and the floor slab Sf is reduced due to the close-up beam 5 being disposed close to the upper surface of the floor slab Sf, the horizontal direction The relatively large gaps D2 and D2 ′ can improve the air permeability of the individual space areas of the underfloor space C partitioned by the beam 5, and in addition, the various pipes L can be provided at various locations in the underfloor space C. The layout and the degree of freedom in handling are further increased.

  As mentioned above, although the Example of this invention was described, this invention is not limited to those Examples, A various Example is possible within the scope of the present invention.

  For example, in the said Example, although the case where the floor support structure in the building concerning this invention was implemented in the apartment house was demonstrated, this can be implemented also in a commercial building and other concrete buildings. Moreover, as a floor board of a floor structure, the outside of a flooring board, a tatami floor, and other well-known things can be used. In the above embodiment, the floor support plate 6 such as a particle board is interposed between the large beam 5 and the floor plate 7 such as a flooring material. In the present invention, such a floor support plate 6 is used. Instead of this, a plurality of joists arranged parallel to each other may be provided on the large beam 5 so as to cross the beam.

  In the above-described embodiment, the central portions of the plurality of large pull beams 5 are connected to each other by a common connecting rod 30, and a plurality of common damping devices (tensile load applying mechanism T) are connected via the connecting rod 30. In the present invention, a damping device (tensile load applying mechanism T) may be provided for each of the large pulling beams 5.

Partial cross-sectional view of an apartment house with a floor support structure according to the first embodiment The expanded sectional view which fractured | ruptured a part along line 2-2 of FIG. Enlarged cross-sectional view along line 3-3 in FIG. Enlarged view of the part shown by arrow 4 in FIG. The enlarged view which fractured | ruptured a part which shows the 5 arrow part of FIG. 6-5 enlarged sectional view of FIG. Enlarged perspective view of support seat for large pull beam Enlarged perspective view of vibration damping device (tensile load application mechanism) Cross-sectional view corresponding to FIG. 1 showing the second embodiment FIG. 9 is an enlarged sectional view taken along line 10-10.

Explanation of symbols

2 Vertical frame wall 5 Large draw beam 5h Through hole 7 for pipe insertion Floor board 8 Anti-vibration rubber (elastic body)
30 Linkage Ba Ba Small beam Bb Full beam C Underfloor space D1 Vertical gap D2, D2 'Horizontal gap Dw Living space F Concrete frame Fh Horizontal frame part Fr Floor structure Fv Vertical frame part L Piping Sf Floor slab T Tensile load application mechanism (damping device)

Claims (4)

Concrete frame comprising a plurality of horizontal frame parts (Fh) each having a floor slab (Sf) that partitions the living space (Dw) up and down, and a vertical frame part (Fv) connecting the upper and lower horizontal frame parts (Fh). (F) is a building having a regular beam structure in which the floor slab (Sf) is connected to the upper surface of the beam (Ba, Bb),
The floor structure (Fr) of the living space (Dw) includes a plurality of large drawing beams (5) arranged with a space therebetween on one plane, and a floor board (5) laid on the beam (5). 7)
The plurality of large pull beams (5) are arranged close to the floor slab (Sf) with a vertical gap (D1) between the multiple large pull beams (5) and the large pull beams (Sf). 5) is disposed with a horizontal gap (D2, D2 ′) between the vertical frame portion (Fv) or another adjacent large beam (5), Each large draw beam (5) is supported on the upper surface of the portion of the floor slab (Sf) corresponding to the beam (Ba, Bb) via an elastic body (8),
Between the floor slab (Sf) and the longitudinal intermediate portion of each large beam (5), when the beam (5) receives a downward impact load, the impact load is applied to the floor slab (Sf). At least one damping device (T) that suppresses vertical vibration of the beam (5) while preventing transmission is interposed,
Further, each large beam (5) has a through-hole for passing a pipe (L) routed in the underfloor space (C) between the lower surface of the floor plate (7) and the upper surface of the floor slab (Sf). (5h) is formed, The floor support structure in a building characterized by the above-mentioned.   The vibration damping device (T) can suppress upward displacement of the beam (5) intermediate portion from the stationary position when each large pull beam (5) is about to vibrate up and down due to the impact load. The floor support structure in a building according to claim 1, characterized by comprising a tensile load applying mechanism for applying a downward tensile load to the beam (5) intermediate portion.   A connecting rod (30) extending between and connecting between the plurality of large drawing beams (5) parallel to each other is connected to the connecting rod (30). The floor support structure in a building according to claim 1 or 2, characterized in that the damping device (T) and the large pulling beam (5) are connected via a cable.   At least one of horizontal gaps (D2, D2 ') formed between the end of the large pull beam (5) and the vertical frame portion (Fv) or another adjacent large pull beam (5). The floor support structure in a building according to claim 1, 2 or 3, wherein a pipe (L) routed through the underfloor space (C) is passed through.

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