JP2008297880A - Floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor structure which facilitates construction and can obtain superior sound insulating performance of heavy-floor impulsive-sound while reducing slab thickness. <P>SOLUTION: In the floor structure wherein a stud 14 is erected inside a column-beam frame 10 surrounding the internal space of a building, and a reinforced concrete beam-less slab 15 constituting the floor inside the column-beam frame 10 is connected to the column-beam frame 10 and the stud 14, a recessed part 16 is formed on the outer periphery of the stud 14, and the beam-less slab 15 is engaged with the recessed part 16 without being fixed to the stud 14, allowing the vertical load of the beam-less slab 15 to be supported with the stud 14 and at least one of an upper end reinforcement and the lower end reinforcement to be jointed to the column-beam frame 10 without being fixed thereto. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a floor structure that can reduce the weight impact sound generated on the floor of a building.

In general, in a reinforced concrete building 1 as shown in FIG. 5, when a floor slab 2 is constructed in a column beam frame, there is a structure in which the reinforcing bar of the floor slab 2 is fixed to the column 3 and beam 4 of the frame. It has been adopted.
In such a floor structure of the building 1, since the span of the column 3 is divided into small portions by the beams 4, vibration energy due to impact generated in the floor slab 2 in the span is dissipated to the surrounding floor slab 2. It stays in the floor slab 2 without. For this reason, there is a problem that the energy of the vibration in the floor slab 2 partitioned by the beam 4 is increased, and as a result, the heavy floor impact sound is increased.

  In addition, as a result of the floor slab 2 being divided into small portions by the beams 4, the resonance frequency of the floor slab 2 becomes relatively high, so that low-order resonance is included in a frequency band that causes a human hearing problem. Moreover, since the floor slab 2 vibrates easily in the low-order resonance, there is a problem in that the performance of blocking heavy floor impact sound is also lowered.

  Therefore, when trying to improve the performance to block heavy floor impact sound, the slab thickness required to satisfy the performance to block heavy floor impact sound is larger than the slab thickness required for strength. Causes the problem of overdesign.

  On the other hand, as shown in FIG. 6, as a conventional reinforced concrete building, there is no beam that divides the column spans small in the column beam frame, and the inside of the column beam frame surrounding the internal space in the outer peripheral part of the building. A structure is known in which the floor slab 5 is constructed and the reinforcing bars of the floor slab 5 are fixed to the column 3 and the beam 4 of the frame.

  According to the floor structure in the building described above, the floor slab 5 is provided over a wide span without dividing the inside of the column beam frame by the beam 4 as in the building 1 shown in FIG. It is possible to dissipate the vibration of the impact generated in 5 to the surroundings. For this reason, the energy of the vibration caused by the impact does not remain at a specific location, and there is an advantage that the heavy floor impact sound can be reduced.

  In addition, since the floor slab 5 is not divided by small spans, the resonance frequency is low, and the order density is high because of high-order resonance in a frequency band that is problematic for human hearing. As a result, in the frequency band, vibrations at individual frequencies are less likely to occur, so that an effect of improving the performance of blocking heavy floor impact sound is also achieved.

  However, in the floor structure in the building shown in FIG. 6, since the floor slab 5 is constructed over a wide span, the slab thickness required for strength satisfies the insulation performance of heavy floor impact sound. From the viewpoint of obtaining sufficient heavy floor impact sound insulation performance, there is a problem that the design becomes excessively large.

Therefore, as a floor structure that can solve such a problem, for example, a modified cross-section concrete floor slab structure excellent in sound insulation performance of a floor as shown in Patent Document 1 below has been proposed.
In this floor slab structure, the end of the slab connected to the beam is made the minimum thickness required for structural performance, and the other central part etc. are made thick so that the slab is viewed as a whole of the floor support span. In addition, the slab thickness and shape in the span direction are different from each other by a combination of a horizontal plane, an inclined plane and a step.
JP 2006-9249 A

  However, in the floor slab structure having the above-described configuration, there is a problem that a great deal of labor is required to construct the floor slab because the cross-sectional shape of the floor slab is different in a plane. In addition, since the slopes and steps are formed on the top and bottom surfaces, it is necessary to form the floor surface horizontally. There is also a disadvantage that it is inferior.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a floor structure that is easy to construct and that can obtain high weight floor impact sound blocking performance while reducing the slab thickness. It is what.

  In order to solve the above-mentioned problem, the floor structure according to claim 1 is a reinforced concrete structure in which a stud is erected inward of a column beam frame surrounding the interior space of the building, and a floor is formed in the column beam frame. In the floor structure formed by connecting a non-beam slab to the column beam frame and the inter-column, a recess is formed on the outer periphery of the inter-column, and the non-beam slab is formed in the recess without fixing the reinforcing bar to the inter-column. The vertical load of the non-beam slab is supported on the inter-column by engaging, and at least one of the upper and lower bars is joined to the column beam frame without being fixed to the column beam frame. To do.

  The invention according to claim 2 is the invention according to claim 1, wherein the upper surface of the non-beam slab located in the surface of the column beam frame is along the core of the column beam frame. A cushioning material having a lower rigidity than that of concrete is disposed, or a groove is formed.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein a bending moment due to a vertical load is not transmitted to the joint portion between the beam of the column beam frame and the non-beam slab. In addition, a plurality of dowel bars that prevent the non-beam slab from moving in the horizontal direction are interposed in the horizontal direction.

  In the first aspect of the present invention, a stud is erected on the inner side of the column beam frame, a no-beam slab is constructed in the column beam frame, and a reinforcing bar of the no-beam slab is fixed to the stud column. Since the vertical load is supported by the studs without any problem, the beam-free slab is provided over a wide span without dividing the inside of the column beam frame by a beam with a short span. For this reason, since the vibration of the shock generated in the beamless slab is dissipated to the surroundings or the natural frequency is lowered, the energy of vibration caused by the shock does not remain in a specific location. Heavy floor impact sound can be reduced.

  In addition, since the non-beam slab is not divided by a small span, the resonance frequency is low, and in a frequency band that is a problem for human hearing, high-order resonance occurs and the order density increases. Thereby, in the said frequency band, since it becomes difficult to produce the vibration in each frequency, the interruption | blocking performance of a heavy floor impact sound can also be improved.

  In particular, for the above-mentioned pillars, the vertical load is supported by engaging the recesses formed on the outer periphery of the pillars without fixing the reinforcing bars of the beamless slabs to the pillars, Since the non-beam slab is joined to the column beam frame without fixing at least one of the upper and lower bars of the non-beam slab, a restraining force (fixed degree) of the non-beam slab to the inter-column or column beam frame is obtained. It can be kept small.

  For this reason, in the frequency band where the natural frequency is lowered and hence the performance of interrupting the heavy floor impact sound is affected, higher-order vibration is generated, so that the performance of interrupting the heavy floor impact sound can be further improved.

  In particular, since the non-beam slab is engaged with the recess formed on the outer periphery of the stud without fixing the reinforcing bars, it is not necessary to increase the thickness of the non-beam slab in terms of structure. As a result, it is possible to perform a rational design in which the slab thickness for satisfying the performance of blocking heavy floor impact sound and the slab thickness required for structural strength are comparable, and the economy is excellent.

  Moreover, it is possible to reduce the number of times of placing concrete when constructing the above-mentioned studs and non-beam slabs, and the trouble of fixing the reinforcing bars of the non-beam slabs to the pillars, and it is possible to construct a plurality of columns in advance. Therefore, it becomes possible to reduce the construction cost and the construction period required for constructing the above-mentioned studs and non-beam slabs.

  In particular, according to the invention described in claim 2, the rigidity is lower than that of concrete along the core of the column beam frame on the upper surface located within the column beam frame of the beamless slab. Since the cushioning material is provided or the groove is formed, the restraining force of the non-beam slab can be further reduced, so that the above-mentioned heavy floor impact sound blocking performance can be improved by reducing the natural frequency. Further improvement is possible.

In addition, since the above-mentioned non-beam slab is joined to the column beam frame without fixing at least one of the upper and lower bars to the column beam frame, for example, both the upper and lower bars are connected to the column beam frame. If it is not fixed, there is a risk of causing a horizontal displacement with respect to the beam.
In such a case, as in the invention described in claim 3, if a plurality of dowel bars are interposed in the joint portion between the beam of the column beam frame and the non-beam slab, the non-beam slab is provided. Can be reliably prevented.

1 to 4 show an embodiment of a floor structure according to the present invention, and reference numeral 10 in the figure denotes a column beam frame that constitutes a part of a building 11.
The column beam frame 10 is a frame that is arranged on the outer peripheral portion of the building 11 and bears a horizontal force, and is a plurality of columns (16 in the figure as an example, with 16 equal spans) standing upright with a predetermined span. 12 and a beam 13 spanned between these columns 12 are rigidly joined together to form a ramen structure that surrounds the interior space of the building 11. In addition, the code | symbol 11a in the figure is the atrium part formed in the center part of this building 11. FIG.

  In addition, a plurality of (in the figure, five) inter-columns 14 are erected on the inner side of the column beam frame 10 with the same span as the column 12, and a floor is formed throughout the column beam frame 10. A flat slab (non-beam slab) 15 is constructed.

  Here, as shown in FIG. 2 and FIG. 3, a concave portion 16 is formed at the joining position of the stud 14 with the flat slab 15 by cutting out the outer peripheral portion over the entire circumference. The concave portion 16 is formed by an inclined surface 16 a whose upper and lower end portions are inclined toward the outer peripheral surface of the intermediate pillar 14 while an intermediate portion in the vertical direction is formed with a constant depth.

  On the other hand, the flat slab 15 is constructed of cast-in-place concrete without fixing any of the reinforcing bars including the internal upper end bars 15a and the lower end bars 15b to the studs 14. Thereby, a part of the vertical load of the flat slab 15 is supported by the stud 14 via a portion engaged in the recess 16 of the stud 14.

  Further, a plurality of upper end well reinforcing bars 17 are arranged on the upper part of the upper end bars 15a in the flat slab 15 along the outer periphery of the intermediate pillars 14 so as to surround the intermediate pillars 14 so as to surround the intermediate pillars 14. The bar is arranged. Further, a plurality of ring bars 18 are arranged coaxially with the axis of the intermediate column 14 so as to surround the intermediate column 14 in the same manner so as to surround the upper column 15 a in the flat slab 15 positioned around the intermediate column 14. It is installed.

On the other hand, as shown in FIG. 4A, the flat slab 15 is joined to the beam 13 of the column beam frame 10 without fixing the lower end stripe 15b and fixing the upper end stripe 15a.
Here, the lower end bar 15b does not transmit a bending moment due to a vertical load at the joint between the flat slab 15 and the beam 13, and also functions as a dowel bar that prevents the flat slab 15 from moving in the horizontal direction. ing.

  Further, on the upper surface of the flat slab 15 located on the outside of the building 11 or the joint portion (within the construction surface of the column beam frame 10) with the beam 13 (shown in color in FIG. 1) along the atrium portion 11a, 4 (a) and 4 (b), a cushioning material 19 having rigidity lower than that of concrete such as rubber, urethane, and wood is disposed along the core of the column beam frame 10.

  Incidentally, FIG. 4A shows a configuration in which both the beam 13 and the flat slab 15 are constructed by on-site concrete, but as shown in FIG. 4B, a PC beam is used as the beam 13. In addition, a floor panel such as a PC plate can be used as the flat slab 15. In such a case, the cushioning material 19 is interposed between the flat slab 15 and the beam 13, and the flat slab 15 The same effect can be obtained by interposing a plurality of dowel bars 21 in the horizontal direction between the beams 13 (connecting portions). In addition, the code | symbol 20 in a figure is the wall which stands in the said junction part, and faces the exterior of a building or the atrium part 11a.

  In the floor structure having the above-described structure, the inter-column 14 is erected on the inner side of the column beam frame 10 with the same span as the column 12, and the flat slab 15 is constructed in the column beam frame 10. The flat slab 15 divides the inside of the column beam frame 10 with a beam with a short span because both the upper end bar 15a and the lower end bar 15b of 15 are supported on the column 14 without being fixed to the column 14. It is provided over almost the entire surface.

  For this reason, it is possible to dissipate the vibration of the impact generated at an arbitrary location of the flat slab 15 to the periphery thereof, and therefore the energy of the vibration caused by the impact does not remain at the specific location. Impact noise can be reduced.

  In addition, since the flat slab 15 is not divided by a small span, the resonance frequency thereof is low, and in a frequency band that is a problem for human hearing, high-order resonance occurs and the order density increases. Thereby, in the said frequency band, since it becomes difficult to produce the vibration in each frequency, the interruption | blocking performance of a heavy floor impact sound can also be improved.

  In addition, since the upper end bar 15a and the lower end bar 15b of the flat slab 15 are not fixed to the stud 14 but are engaged with the recess 16 formed on the outer periphery of the stud 14 to support the vertical load, The restraining force (fixed degree) with respect to 14 flat slabs 15 can be kept small. For this reason, since the natural frequency is lowered and high-order vibration is generated in a frequency band that affects the performance of blocking heavy floor impact sound, the performance of blocking heavy floor impact sound can be further improved.

  In addition, since the flat slab 15 is fixed to the beam 13 of the column beam frame 10 only at the lower end bar 15b, and the upper slab 15a is bonded to the beam 13 without fixing, the flat slab 15 is attached to the column beam frame 10. The restraining force (fixed degree) of the flat slab 15 can also be reduced, and as a result, the natural frequency is lowered. As a result, high-order vibrations are generated in the frequency band that affects the performance of interrupting heavy floor impact sound. Can be improved.

  In particular, since the flat slab 15 is engaged with the recess 16 formed on the outer periphery of the inter-column 14 without fixing the reinforcing bars such as the upper end bars 15a and the lower end bars 15b, the thickness of the flat slab 15 is structurally increased. There is no need to do. As a result, the slab thickness to satisfy the heavy-floor impact sound insulation performance and the slab thickness required for structural strength are comparable. Excellent.

  Furthermore, according to the said floor structure, the number of times of placing concrete when constructing the stud 14 and the flat slab 15 and the labor for fixing the upper bar 15a and the lower bar 15b of the flat slab 15 to the stud 14 can be reduced. In addition, since it becomes possible to construct the inter-columns 14 for a plurality of layers in advance, it is possible to reduce the construction cost and the construction period required for constructing the inter-columns 14 and the flat slab 15.

  In addition, a cushioning material 19 having a rigidity lower than that of concrete is provided on the upper surface of the flat slab 15 located outside the building 11 or at a joint portion with the beam 13 along the blow-through portion 11a (in the construction surface of the column beam frame 10). Since the beam frame 10 is arranged along the core of the beam frame, the restraining force on the flat slab 15 can be further reduced, so that the above-described performance of blocking heavy floor impact sound by reducing the natural frequency can be further improved. This can be further improved.

  In addition, the joint between the beam 13 of the column beam frame 10 and the flat slab 15 includes a bottom bar 15b of the flat slab 15 in FIG. 4A and a plurality of dowel bars 21 in FIG. 4B. Since it is interposed in the horizontal direction, the flat slab 15 can be reliably prevented from shifting in the horizontal direction with respect to the beam 13.

  In the above embodiment, only the case where the cushioning material 19 is disposed along the core of the column beam frame 10 on the upper surface of the flat slab 15 located in the frame surface of the column beam frame 10 has been described. However, the present invention is not limited to this, and instead of the cushioning material 19, even if a groove is formed along the core of the column beam frame 10 on the upper surface of the flat slab 15, the weight floor is similarly reduced by reducing the natural frequency. A further improvement effect of the impact sound blocking performance can be obtained.

It is a top view which shows one Embodiment of the floor structure of this invention, and the arrangement | positioning of the building and column beam frame to which this is applied. It is a longitudinal cross-sectional view which shows the floor structure of FIG. FIG. 3 is a cross-sectional view of FIG. 2. (A) is a longitudinal cross-sectional view which shows the junction part of a beam and a flat slab, (b) is a longitudinal cross-sectional view which shows the modification. It is a top view which shows the conventional column beam frame and floor structure. It is a top view which shows the other conventional column beam frame and floor structure.

Explanation of symbols

10 Column-beam frame 11 Building 12 Column 13 Beam 14 Spacer 15 Flat slab (no-beam slab)
15a Upper end line 15b Lower end line 16 Recessed part 19 Cushioning material 21 Dowel line

Claims (3)

A floor constructed by setting up studs inside the column beam frame that surrounds the interior space of the building, and connecting the reinforced concrete no-beam slabs that constitute the floor in the column beam frame to the column beam frame and the frame column. In structure
A recess is formed on the outer periphery of the stud, and the no-beam slab is supported on the stud by supporting the vertical load of the no-beam slab by engaging the recess without fixing the reinforcing bar to the stud. A floor structure characterized in that at least one of an upper bar and a lower bar is joined to the column beam frame without being fixed to the column beam frame.   On the upper surface of the non-beam slab located within the surface of the column beam frame, a cushioning material having rigidity lower than that of concrete is disposed along the core of the column beam frame, or a groove is formed. The floor structure according to claim 1, wherein:   A plurality of dowel bars that do not transmit a bending moment due to a vertical load and prevent the horizontal movement of the beamless slab are horizontally connected to the joint between the beam of the column beam frame and the beamless slab. The floor structure according to claim 1, wherein the floor structure is interposed between the floor structure and the floor structure.

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