JP4031469B2 - Variable cross-section concrete floor slab structure with excellent floor sound insulation performance - Google Patents

Description

  The present invention is a concrete floor slab structure that can be widely applied to floors of mid-to-low to high-rise apartment buildings, and provides a comfortable living space with dramatically improved sound insulation performance and a high ceiling height. It belongs to the technical field of variable cross-section concrete floor slab structure that has high flexibility of water fields and can realize the renewability of equipment piping.

Conventionally, the concrete floor slab structure of apartment houses has been dealt with by increasing the weight and rigidity of the entire floor by increasing the thickness of the slab or adding a small beam to improve the sound insulation performance of the floor.
However, especially in the case of ultra-high-rise apartments, the impact of the weight increase of the floor slab is very large, and it is necessary to enlarge the cross section of the columns and beams and strengthen the foundation and support piles, resulting in increased construction costs. In addition, if the floor height is the same, the ceiling height is lowered, and if the ceiling height is increased, the height of the entire building is increased or the number of floors is reduced.

Next, in order to provide the next generation of new ways of living and comfortable living spaces for the future for multi-family housing, develop methods to realize greater spans of houses, freedom of living spaces, and renewability of equipment piping. Or the request | requirement of the response | compatibility etc. to the skeleton infill (SI) in which the freedom degree of a water field is possible in the whole dwelling unit is increasing. A mere large-span floor slab or flat slab structure will increase the thickness and weight of the slab, adversely affecting the structure, foundation and pile work, and shortening the construction period.
On the other hand, as a countermeasure bed weight impact sound in the country, although the improvement of sound insulation performance of the low-frequency region of 60~100Hz that has been the most problems have been various studies, is still satisfactory solution without, hand jam situation It is.

For example, in Patent Document 1 below, each dwelling unit is divided into an equipment zone in which water areas are centrally arranged and a living zone in which living rooms are arranged for the purpose of improving the habitability of an apartment house. There is disclosed an apartment house with a ramen structure of beams and a living zone configured as a tube structure made of a flat plate without beams. However, there are no special considerations or ideas regarding the water gradient and sound insulation performance of the water field.
Patent Document 2 discloses a building in which the floor is configured with a non-beam flat plate and the beam of the outer frame is provided as a reverse beam for the purpose of reducing the floor height without sacrificing habitability.

In Patent Document 3, a trench space is recessed in the floor surface for the purpose of minimizing the reference floor height while ensuring the ceiling height to enable free water space arrangement and high quality living space. In addition, an architectural structure of a housing complex is disclosed in which drainage branch pipes are arranged at appropriate positions in the trench space, and a water field can be installed at an arbitrary position in the trench space.
Patent Document 4 describes that it is better than the top level of the floor slab on the daylighting surface for the purpose of increasing the ceiling height as much as possible, with excellent openability, freedom of planning, and future renewability. In addition, a floor slab structure is disclosed in which the top level of a water floor slab is formed low by providing a step. The step is formed by a connecting portion formed like a beam in which prestressing by PC steel is introduced at the boundary portion between the floor slab on the lighting side and the water floor slab, and a large lifting force is generated in the connecting portion. A spanslab is formed. However, no consideration is given to the inclined surface of the water gradient, and paragraphs [0044] to [0045] describe that a drainage gradient necessary for the function is secured by horizontally pulling the drainage pipe using the step. ] Is only accepted.

  Patent Document 5 discloses a floor slab structure in which the entire floor slab is inclined more than a natural drainage gradient to secure a ceiling pocket for installing an air supply / exhaust device.

JP-A-8-13820 JP 2000-120281 A JP 2002-54314 A JP 2002-138618 A JP 2003-129602 A

  As is clear from each of the above Patent Documents 1 to 5, the prior art provides a comfortable living space for the concrete floor slab structure of an apartment house, or expands the degree of freedom of the dwelling unit span and living space, and facilities In order to realize the renewability of the piping, various improvements and ingenuity have been repeated for the purpose of dealing with a skeleton infill (SI) in which the degree of freedom of the water field is possible throughout the entire dwelling unit. However, such improvements and ingenuities are merely individual solutions to each of the many problems, and there are no technologies aimed at total solutions. For example, improvements and improvements to improve the sound insulation performance of the floor are usually left to the floor mats, etc. laid on the slab, and the sound insulation effect is dramatically improved by improving and improving the slab housing. Such prior art is not heard.

  The object of the present invention is to dramatically improve the sound insulation performance of the floor while minimizing the thickness and floor weight of the floor slab, particularly 60 to 100 Hz, which is the most difficult to improve the sound insulation performance among the floor weight impact sounds. Improves sound insulation performance in the frequency domain, and at the same time, can provide a comfortable living space by expanding the ceiling height even at the same floor height, reducing the building height or increasing the number of layers if the same building height Yes, it is possible to realize the flexibility of the water plan, the renewability of the equipment piping, the response to SI, and by reducing the weight of the frame, the foundation and pile work can be reduced and constructed accordingly. The aim is to provide a variable cross-section concrete floor slab structure with excellent sound insulation performance of the floor that can be used for total solution of many problems such as cost reduction and shortening of construction period.

As a means for solving the above-mentioned problem, the variable cross-section concrete floor slab structure excellent in the sound insulation performance of the floor according to the invention described in claim 1 is:
The end portion 2 of the slab connected to the beam 1 has a minimum thickness required for structural performance, the center portion is formed thicker than the minimum thickness, and the lower end surface 3 of the slab is linear in the depth direction of the dwelling unit. When the slab is viewed as a whole of the floor support span, the slab thickness and shape in the floor support span direction differ depending on the combination of the horizontal surface 6a, the inclined surface 6b, and the step 7. It is characterized by.

The variable cross-section concrete floor slab structure excellent in the sound insulation performance of the floor according to the invention described in claim 2 is:
The end portion 2 of the slab connected to the beam 1 has a minimum thickness required for structural performance, and the central portion is formed to be thicker than the minimum thickness. The present invention is characterized in that the slab thickness and shape in the floor support span direction are different cross-sectional configurations by a combination of large and small voids 20 or voids 21 having various shapes.

The invention described in claim 3 is a variable cross-section concrete floor slab structure excellent in sound insulation performance of the floor described in claim 1 or 2,
As a cross section in the depth direction of the dwelling unit, the lower end surface 3 of the slab is formed as an inclined surface linearly descending in the depth direction of the dwelling unit, and the upper end surface 6a of the living portion on the balcony 5 side is formed as a horizontal plane. Is formed on the inclined surface 6b corresponding to the water gradient after being lowered one step by the step 7.

The invention described in claim 4 is, in the variable cross-section concrete floor slab structure excellent in the sound insulation performance of the floor described in claim 3,
The water field portion is characterized by being formed in a multi-stage slope that repeats a step and an inclined surface 6b or a horizontal plane according to the water gradient and length of the equipment pipe 8.

The variable cross-section concrete floor slab structure excellent in the sound insulation performance of the floor according to the invention described in claim 5 is:
The end portion of the slab connected to the beam has a minimum thickness required for structural performance, and the central portion is formed to have a uniform thickness with a thickness larger than the minimum thickness of the end portion 2. When viewed as a whole, it is characterized in that the slab thickness and shape in the floor support span direction are different from each other by a combination of voids 20 having different diameters or voids 21 having different shapes.

The invention described in claim 6 is the variable cross-section concrete floor slab structure excellent in the sound insulation performance of the floor according to any one of claims 1 to 5,
Concrete floor slabs are composed of perforated precast concrete composite slabs, semi-precast concrete composite slabs, precast concrete slabs with pre-stress, in-situ concrete slabs, or in-situ concrete slabs with pre-stress It is characterized by that.

The modified cross-section concrete floor slab structure of the present invention dramatically reduces the low frequency region of 60 to 100 Hz, which has been considered to be the most difficult to reduce in the conventional heavy impact sound level as the sound insulation performance of the floor by the modified cross-section effect. It was confirmed that it was possible (see, for example, FIGS. 5, 7, and 13). It is possible to improve the sound insulation performance of the floor by regularly adjusting the floor weight and floor rigidity. As a result of improving the sound insulation performance of the floor in this way, it is possible to reduce the cross section of the main structure (structural frame) such as floor slabs, pillars, beams, etc., and reduce the cost of frame construction by several percent. It is possible. In addition, as the floor weight is reduced by reducing the thickness of the slab end and floor rigidity, and the cross-section of the main structural frame such as columns and beams is reduced, the cost of foundation work and pile work to support the building is also low. It is possible to reduce it. In this way, the construction period can be shortened as much as the volume of the building is reduced.
When the floor slab has a hollow void structure as in the second aspect of the invention, the floor weight is further reduced, and the above-described effect is doubled.

In the variable cross-section concrete floor slab structure of the invention according to claim 3, the slab upper end surface of the water field portion is formed as an inclined surface 6b corresponding to a water gradient (equipment piping gradient), and in the case of the invention according to claim 4 since the slab upper surface is formed in multiple stages of inclination corresponding to the water gradient (Fig. 15), the freedom of watering plan, and housing support for renewable and skeleton infill future piping (SI) Easily possible.
More specifically, since the floor slab lower end surface 3 on the living room 5 side (water upper side) is at a high position (see FIG. 2), the height of the ceiling 10 can be made as high as possible even at the same floor height, and the high sash A comfortable living space can be provided by applying Conversely, if the design is the same ceiling height and eave height, the floor height can be reduced, and the building height can be reduced correspondingly, or in the case of a 20 to 60-story high-rise house, 1 to 5 layers. It is possible to increase the number of units and gain the benefits of increasing the number of units and the area occupied by units.

  If the cross-section concrete floor slab structure of the present invention is a floor slab span of 5m to 15m class as a study of the construction method, precast concrete composite slab (half PC slab, perforated PC slab, omnia version, etc.) It can be adopted and constructed, and can improve productivity by expanding factory production. If the floor slab span is larger, it can be applied by applying a prestressed slab made of cast or precast concrete, or a lightweight slab in which hollow voids are randomly arranged.

Minimum thickness Satoshi end 2 of the floor connected with the beam 1 is required on structural performance, the central portion component is formed thicker than the thickness of the pre-Symbol Min. The lower end surface 3 of the slab is formed in an inclined surface linearly descending in the depth direction of the dwelling unit, and when the floor slab is viewed as a whole of the floor support span, the combination of the horizontal surface 6a, the inclined surface 6b and the step 7 in the floor support span direction. The slab thickness in the floor support span direction is constituted by the void 20 having a different cross-sectional configuration having a different slab thickness and shape, or a random combination of the voids 21 having different diameters or the voids 21 having different shapes when viewed as a whole of the floor support span. And a configuration of a variable cross section having a different shape.
As a cross section in the depth direction of the dwelling unit, the slab lower end surface 3 is formed as an inclined surface that linearly descends in the depth direction, the slab upper end surface 6a of the living portion on the balcony 5 side is formed as a horizontal plane, and the water field portion on the back side is a step. 7 is formed on the inclined surface 6b corresponding to the water gradient.

1 and 2 show an embodiment of a variable cross-section concrete floor slab structure excellent in sound insulation of a floor according to the present invention as a cross-sectional view of a part of a building and an enlarged cross-sectional view of one layer therein.
As shown in FIG. 2, in the variable cross-section concrete floor slab structure of the present invention, the end 2 of the slab connected to the beam 1 has a minimum thickness (for example, 180 mm) required for structural performance, and the other center. The portions and the like are formed thick as described below.
In the case of the embodiment shown in FIGS. 1 and 2, in the depth direction cross section of the dwelling unit, which is the left-right direction of the page, the slab lower end surface 3 is formed as an inclined surface that linearly descends in the depth direction (right direction) equally to the water gradient. ing. For example, when viewed with reference to the horizontal floor finish surface 4, the lower end surface of the left end of the slab is a position lowered by 310 mm, while the lower end surface of the right end of the slab is a position lowered by 480 mm.

On the other hand, with respect to the slab upper surface, a living unit content of the slab upper end surface 6a of the balcony 5 side is formed in a horizontal plane, it is thicker than the minimum thickness of the end portion 2. On the other hand, the slab upper end surface 6 b of the water field portion on the back side is formed in an inclined surface corresponding to the water gradient after being lowered by one step 7, specifically, an inclined surface parallel to the slab lower end surface 3. As a result, the slab upper end surface 6a of the living portion on the balcony 5 side is a position lowered by 130 mm when viewed from the horizontal floor finish surface 4, but the horizontal floor is reached when reaching the right end of the slab upper end surface 6b of the water field portion. It is formed at a position lowered by 300 mm from the finished surface 4.
Therefore, even if the drainage pipe 8 is directly placed on the slab upper end surface 6b of the water field portion, a necessary drainage gradient can be secured as it is. Therefore, the degree of freedom of the water plan is high and the renewability of the equipment piping can be secured. As shown by the dotted line 6a 'in FIG. 2, the horizontal slab upper end surface of the living part and the position of the step 7' can be freely designed, and as a result, the skeleton infill (in which the water field can be freely designed throughout the dwelling unit) It is possible to easily respond to requests for handling SI).

As described above, the lower end surface 3 of the slab is formed on an inclined surface that linearly descends in the depth direction and is equal to the water gradient, so that the ceiling 10 formed on the lower side is the ceiling 10 of the living part on the balcony 5 side. As shown in FIG. 2, it can be formed as close to the slab lower end surface 3 as possible. Therefore, the living side can be a comfortable living space with a high ceiling. On the contrary, the ceiling 11 of the water field must be formed as low as it is because the lower end surface 3 of the slab is lowered. In addition, in the vicinity of the beam 1 through which the air supply / exhaust pipe 9 penetrates, a ceiling space 12 for installing air conditioning equipment is secured.
1 and 2, reference numeral 13 indicates a partition wall.

Next, the sound insulation performance of the variable cross-section concrete floor slab structure will be described.
FIG. 3 shows a cross-sectional model (slab end thickness 150 mm, center thickness 250 mm) of a variable cross-section slab (haunch type = 6.4 m × 8.0 m) as a test body of the present invention. As both side portions from the middle portion of the water plane 6a is formed as an inclined face 6b toward the minimum thickness of the end portion 2 of the symmetrically slabs, than has been the smallest region over substantially the entire length of the end portion 2 the thickness of the floor support span It is formed thick. FIG. 4 shows the positions of detection points 1 and 4 of the weight impact sound level = acceleration (ease of floor shaking) in the test body. The conventional model to be compared with the specimen of the present invention is an RC slab having a uniform cross section having a thickness of 200 mm.
FIG. 5 shows a comparative view of the sound insulation performance (ease of shaking) of each floor slab at points 1 and 4. The solid line X in the figure is a vibration characteristic diagram relating to the specimen of the present invention, and the dotted line Y indicates the vibration characteristic of the conventional model. Obvious fact from FIG. 5, the vibration characteristic X specimens of the present invention, the sound insulation performance level in the low frequency region of 60~100Hz at any point is greatly reduced as it can be said that about half of that of the conventional example model In other words, the floor impact sound level of one rank or more is reduced when converted to the sound insulation performance of the floor. This shows that the cross-section slab in which the thickness of the slab end portion 2 is reduced and the thickness of the other central portion is increased has a very large sound insulation effect.

  As described above, the sound insulation performance level of the variable section floor slab is improved by one rank compared to the conventional model of the uniform section, conversely, the thickness, weight and rigidity of the variable section floor slab are reduced by one rank, It is possible to reduce the weight of the floor slab. As a result, the cross section of the main structure (structural frame) such as columns and beams can be reduced by several percent. As a result, it is possible to reduce the construction cost by several percent. In addition, as the floor weight is reduced by reducing the thickness and floor rigidity of the slab end 2 and the cross section of the main structural frame such as pillars and beams is reduced, the cost of foundation work and pile work to support the building is also reduced. It is possible to reduce several percent. Thus, it is possible to obtain a great ripple effect that the shortening of the construction period can be expected as the bulk of the building is reduced.

Figure 6 is a different test bodies models of the present invention, the slab bottom surface 3 is horizontal, the central portion of the slab upper surface increasingly thicker portion 6c via a step difference 7 is horizontally formed, the both side portions 6d minimum An example of a variable-section floor slab (slab end thickness 150 mm) formed in a uniform cross section with the slab end 2 of thickness is shown. The conventional model to be compared with this is an RC slab having a uniform cross section having a thickness of 200 mm.
FIG. 7 shows a comparative view of the sound insulation performance (ease of shaking) of each floor slab at the same points 1 and 4 as in the example of FIG. The solid line X in the figure is a vibration characteristic diagram relating to the specimen of the present invention, and the dotted line Y indicates the vibration characteristic of the conventional model. Obvious fact from FIG. 7, also the vibration characteristic X specimens of the present invention, in any point, the vibration performance level of the floor in the low frequency region of 60~100Hz is approximately half that of conventional models The level has been greatly reduced, and the floor impact sound level of 1 rank or more is reduced when converted into the sound insulation performance of the floor.

What can be said by analogy with the comparative diagrams (FIGS. 5 and 7) of the sound insulation performance (ease of shaking) described above is a combination of the horizontal surface 6a or 6c, the inclined surface 6b, and the step 7 as in the present invention. If the thickness and shape to whole look seeds s different variations sectional configuration of the floor support span, sound insulation performance (impact sound level) is remarkably improved. As a result, the floor slab can be reduced in weight by reducing the thickness, weight, and rigidity of the floor slab by one rank.
Based on the above results, the water plane 6a due to the combination of the inclined surface 6b and the step 7, specific examples of various implementations possible model of superior varying cross-section concrete floor slab structure in sound insulation performance. For example, a floor slab having a variable cross-sectional shape shown in FIGS. 8A to 8E and a floor slab having a variable cross-sectional shape as shown in FIGS. 9A to 9H can be implemented.

Next, the Example regarding the hollow void slab based on invention of Claim 2 is demonstrated.
According to the results of experiments by the inventors, as illustrated in FIGS. 10A to 10C, the end portion 2 of the slab connected to the beam 1 has a minimum thickness required for structural performance. central component is formed thicker than the thickness of said minimum, by a combination of the horizontal plane 6a inclined surface 6b and the step 7, a total of looking the floor supporting spanwise thickness and shape different variable cross-section in the floor support span structure Alternatively, it has been confirmed that the sound insulation performance of the floor is dramatically improved when the slab thickness and shape are changed to different cross sections by randomly arranging and combining the voids 20 having different diameters.

That is, in order to confirm the sound insulation performance of the variable cross-section concrete floor slab structure by the hollow void as described above, a test body shown in FIG. 11 was prepared. This test specimen has a slab end 2 having a thickness of 150 mm, which is the minimum thickness required for structural performance, and has a uniform cross section with the same thickness at the center and the like. Specifically, the diameter of the void 20 in the vicinity of the end 2 is large, the diameter of the void 20 near the center is small and the same size is arranged, and the floor support span is viewed as a whole in the floor support span. The thickness in the support span direction is formed in a substantially variable cross section. On the other hand, the conventional model to be compared with this was an RC slab having a uniform cross section with a thickness of 200 mm.
FIG. 12 shows the positions of the detection points 1 and 4 of each model.

FIG. 13 shows a comparative view of the sound insulation performance (ease of shaking) of each floor slab at points 1 and 4 described above. The solid line X in the figure is a vibration characteristic diagram relating to the specimen of the present invention, and the dotted line Y indicates the vibration characteristic of the conventional model. From FIG. 13, it is clear that the vibration characteristic X of the test specimen of the present invention has a sound insulation performance level in the low frequency region of 60 to 100 Hz that is greatly reduced from that of the conventional model at any point. In addition, the sound insulation performance level against the weight impact sound of the floor is lowered by one rank.
In short, as shown in FIG. 11, the floor support is viewed as a whole in the floor support span by a configuration in which hollow voids 20 having different diameters are randomly arranged on a slab having a uniform cross section whose thickness is equal to the floor support span direction. If the cross-section floor slab has a substantially variable cross-sectional thickness and shape in the span direction, it is confirmed as a concrete floor slab with excellent vibration characteristics as described above and excellent sound insulation performance in the low frequency range of 60 to 100 Hz. It is to be able to do it.

  Therefore, as illustrated in FIGS. 10B and 10C, the thickness of the slab end portion 2 is the minimum thickness required for structural performance, and the central portion has a horizontal surface 6a, an inclined surface 6b, and a step 7. In the case where the thickness is larger than the minimum thickness, and the slab thickness and shape are variously different in the floor support span direction when viewed from the whole floor support span, It can be easily inferred that a more excellent sound insulation characteristic is exhibited.

Of course, as in the embodiment shown in FIG. 10 (a), the thickness of the slab end portion 2 is the minimum thickness required for structural performance, and the central portion is evenly thicker than the minimum thickness. Concrete in which voids 20 having different diameters are arranged randomly, and are formed into substantially variable cross-sectional shapes having different slab thicknesses and shapes in the floor support span direction when viewed as a whole of the floor support span. Even in the case of a floor slab, it can be easily inferred that the sound insulation performance is excellent (the invention described in claim 5).

  As shown in FIG. 14, not only the shape of the void is circular but also a random combination of differently shaped voids 21 such as a quadrangle, a triangle and a polygon, the floor support span is substantially viewed as a whole. It can also be easily analogized that the floor slab having a variable cross-sectional shape having a different slab thickness and shape in the floor support span direction is similarly excellent in the sound insulation performance of the floor.

  Next, FIG. 15 replaces the means for forming the slab upper end surface 6b of the water field portion as an inclined surface corresponding to the water gradient as in FIGS. 24 and the example which formed in the multistage inclination which repeats the level | step difference 7 and the horizontal surface 6e according to the water gradient required for the equipment piping 8 attached to each, and length (invention described in Claim 4). .

Finally, when the variable cross-section concrete floor slab structure excellent in sound insulation performance of the floor according to the present invention is implemented as in each of the above embodiments, the variable cross-section concrete floor slab is a perforated precast concrete composite slab, It is added that the pre-stressed concrete composite slab, prestressed precast concrete slab, or cast-in-place concrete floor slab, pre-stressed in-situ concrete floor slab, etc. can be configured and implemented without changing from the existing technology. Invention described in Item 6).
As a construction method, if it is a floor slab span of 5m to 15m class, a precast concrete composite floor slab (half PC floor slab, perforated PC floor slab, omnia version, etc.) can be used for construction. In this way, productivity can be improved by expanding factory production.
If the floor slab span is larger, it can be applied by applying a prestressed in-situ or precast concrete slab or a lightweight slab in which hollow voids are randomly arranged.

It is sectional drawing which showed a part of building which implemented the variable cross-section concrete floor slab structure excellent in the sound-insulation performance based on this invention. It is sectional drawing which expands and shows the part for the said building. It is sectional drawing which showed the vibration experiment model of the variable cross-section concrete floor slab structure which concerns on this invention. It is a top view which shows the position of the detection point in the said floor slab. It is a sound insulation performance (easiness of shaking) comparison figure in the said point of the model of this invention and a prior art example model. It is sectional drawing which showed the vibration experiment model from which the cross-section concrete floor slab structure concerning this invention differs further. It is a sound insulation performance (easiness of shaking) comparison figure of the model of the present invention described above and the conventional example model. a to e are cross-sectional views showing various examples of the variable cross-section concrete floor slab structure according to the present invention. a to h are cross-sectional views showing still another embodiment of the variable cross-section concrete floor slab structure according to the present invention. FIGS. 4A to 4C are cross-sectional views showing various examples of a variable cross-section concrete floor slab structure with a hollow void according to the present invention. It is sectional drawing which showed the vibration experiment model of the variable cross-section concrete floor slab structure by the hollow void which concerns on this invention. It is a top view which shows the position of the detection point in the said hollow void floor slab. It is a sound insulation performance (easiness of shaking) comparison figure in the said point of the model of this invention and a prior art example model. It is sectional drawing which showed the Example from which the cross-section concrete floor slab structure by the hollow void which concerns on this invention differs. It is sectional drawing which showed the Example from which the cross-section concrete floor slab structure which concerns on this invention differs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Beam 2 End part of slab 3 Lower end surface of slab 6a Horizontal surface 6b Inclined surface 7 Level difference 20 Hollow void 21 Deformed hollow void 5 Balcony

Claims (6)

  The end of the slab connected to the beam is the minimum thickness required for structural performance, the central part is formed thicker than the minimum thickness, and the lower end surface of the slab slopes down linearly in the depth direction of the dwelling unit The floor is characterized in that when the slab is formed as a whole, the floor support span is a combination of a horizontal plane, an inclined surface, and a step, and the slab thickness and shape in the floor support span direction are different cross-sectional configurations. A variable-section concrete floor slab structure with excellent sound insulation performance.   The end of the slab connected to the beam has a minimum thickness required for structural performance, and the central portion is formed to be thicker than the minimum thickness. When the slab is viewed as a whole of the floor support span, the diameter is large or small. A variable cross-section concrete floor slab with excellent sound insulation performance, characterized in that it has a different cross-sectional configuration with different slab thickness and shape in the floor support span direction due to different voids or combinations of voids with different shapes. Construction. As a cross section in the depth direction of the dwelling unit, the lower end surface of the slab is formed on an inclined surface that goes down linearly in the depth direction of the dwelling unit, the upper end surface of the slab on the balcony side is formed as a horizontal plane, and the water field portion on the back side is formed by a step. 3. The variable cross-section concrete floor slab structure with excellent sound insulation performance according to claim 1 or 2, wherein the floor is formed on an inclined surface corresponding to a water gradient after being lowered one step. The water field portion is formed in a multi-stage slope that repeats a step and an inclined surface or a horizontal plane according to the water gradient and length of the equipment piping, and is excellent in sound insulation performance of the floor according to claim 3. Modified section concrete floor slab structure.   The end of the slab connected to the beam has a minimum thickness required for structural performance, and the central portion is formed to have a uniform thickness with a thickness larger than the minimum thickness of the end. The sound insulation performance of the floor is characterized by the configuration of a variable cross section with different slab thickness and shape in the floor support span direction by the combination of voids with different diameters or differently shaped voids. Excellent variable section concrete floor slab structure.   Concrete floor slabs are composed of perforated precast concrete composite slabs, semi-precast concrete composite slabs, precast concrete slabs with pre-stress, in-situ concrete slabs, or in-situ concrete slabs with pre-stress The variable cross-section concrete floor slab structure excellent in the sound insulation performance of the floor as described in any one of Claims 1-5 characterized by the above-mentioned.

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