JP4872389B2 - Pool installation structure - Google Patents

Description

  The present invention relates to a pool installation structure, and more particularly to a pool installation structure that can reduce vibrations propagating from a pool installed in a building downstairs.

  Conventionally, various structures for installing a pool in a building are known (for example, Patent Document 1). In such a structure, when a pool is installed on a rooftop, an upper floor or the like, it is required to reduce solid sound that propagates downstairs due to swimming or diving in the pool. In order to meet this requirement, a so-called floating floor structure in which anti-vibration rubber is provided between the building slab and the bottom of the pool is used. It becomes complicated and the labor required for construction tends to increase.

  Therefore, a structure shown in FIG. 8 is known as a simplified installation structure of the pool. In the figure, on the slab S, a plurality of base materials 50 are stacked stepwise along the inclination direction of the bottom surface P1 of the pool P, and after the sand 51 is laid on the base material 50, the pool P is formed. It is placed. In such a configuration, the base material 50 is formed of an elastic material, so that an anti-vibration effect for the downstairs can be obtained to some extent.

JP-A-7-62907

However, in the structure of FIG. 8, there is a disadvantage in that the elasticity of the region where the overall thickness of the stacked base material 50 is thin (the region on the left side in the figure) is poor and sufficient vibration-proofing performance for the downstairs cannot be obtained. is there.
Here, if each base material 50 is made of a relatively soft material, that is, a material having a low Young's modulus and a low resonance frequency and a small spring constant, the vibration isolation performance can be improved. In this case, the bottom surface P1 of the pool P Does not sink uniformly, causing another inconvenience that the bottom surface P1 is distorted and causes quality degradation. This is because the amount of deflection of the base material 50 increases as the overall thickness of the stacked base material 50 increases due to the weight when the pool P is full, and consequently the amount of deflection of the bottom surface P1 of the pool P. However, this is due to the fact that it varies greatly depending on the thickness of the base material 50.
Further, an excellent vibration-proof material that is soft as the base material 50 and has durability against the weight of the pool P tends to be relatively expensive, and the use of a large amount of such material increases the construction cost of the pool. There are also inconveniences.

[Object of invention]
The present invention has been devised by paying attention to such inconveniences, and its purpose is to suppress the propagation of vibrations to the downstairs etc. due to the use of the pool and prevent the pool bottom surface from being distorted. It is to provide an installation structure of a pool that can do.
Another object of the present invention is to provide a pool installation structure capable of reducing the cost of materials used.

In order to achieve the above object, the present invention provides an installation structure in which a pool whose bottom surface is inclined is installed on the upper side of a base material placed on a slab of a building.
The base material is configured using a material having elasticity, and is provided in a staircase shape along the tilt direction.
When each step of the stairs is divided and viewed as a plurality of different virtual areas, the vertical spring constant per unit area in the base material of each virtual area is 1/1 of the spring constant of the adjacent virtual area. It is also possible to adopt a configuration in which the value is set within a range of 0.7 to 1.7 times.

  Further, the base material is formed by stacking a plurality of plate-like members having different plane areas, and among these plate-like members, some plate-like members are set to have a smaller spring constant than other plate-like members. It is preferable to adopt the configuration of being performed.

In addition, the present invention provides an installation structure in which a pool whose bottom surface is inclined is installed above the base material placed on the slab of the building.
The base material is configured using a material having elasticity, and is provided in a staircase shape along the tilt direction.
When each step of the staircase is divided and viewed as a plurality of different virtual areas, the resonance frequency in the vertical direction in the base material of each virtual area is 0.7 to 1.3 of the resonance frequency of the adjacent virtual area. A configuration in which it is set within the double range is also adopted.

  According to the present invention, when the pool is full, the amount of deflection at the pool bottom surface of each virtual area can be made uniform, and the occurrence of distortion of the bottom surface can be suppressed. In addition, since it is only necessary to place the base material on the slab, the structure can be simplified and the construction labor can be reduced, and the vibration transmitted from the pool can be absorbed by the base material to obtain good vibration isolation performance. Can do.

  In addition, as described above, by reducing the spring constant or the resonance frequency of only some plate-like members, it is possible to suppress the use of expensive materials while reducing the vibration in each virtual area and reducing the cost. Reduction can be achieved.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view schematically illustrating a pool installation structure according to the embodiment. In this figure, a pool P is installed on a slab S, and this slab S is oriented in a substantially horizontal direction to constitute a building such as a predetermined building or a sports facility. The pool P includes a bottom surface P1 inclined in the lower left direction in the drawing in order to form a water gradient, and a peripheral surface P2 rising from the outer peripheral side of the bottom surface P1 to form an internal space capable of storing water. On the outer side of the peripheral surface P2 on the slab S, a frame portion C made of concrete or the like is provided.

A base material 11 is placed on the upper surface of the slab S, and a bottom surface P1 of the pool P is placed on a filler 12 made of sand or the like on the upper side of the base material 11. The base material 11 is configured by combining a plurality of (in the present embodiment, five) plate members 13 having elasticity, and is formed in a stepped shape along the inclination direction of the bottom surface P1. Specifically, the lowermost plate-like member 13 has a flat area that is substantially the same as or slightly larger than the bottom surface P1, and the flat area is different so that the flat area becomes smaller as the position of the plate-like member 13 becomes the upper stage. It has.
As the material of the plate-like member 13, in addition to foamed material and synthetic resin foam, foamed plastic heat insulating material (JIS A 9511) such as polystyrene foam, urethane foam, polyethylene foam, phenol foam, or semi-rigid, closed cell sheet Examples thereof include polyolefin foams (including polyethylene foams) made of a foam. When a foam material or a synthetic resin foam is used, either closed cells or open cells may be used.

  The upper surface of the filler 12 is formed into an inclined surface that is substantially in surface contact with the bottom surface P1 after the base material 11 is placed on the slab S.

  Next, the anti-vibration performance of the base material 11 when the water is stored in the pool and the amount of deflection generated on the bottom surface P1 will be examined.

Here, as shown in FIG. 1, each step of the base material 11 formed in a staircase shape is divided into virtual areas A to E in order from the bottom. In this case, the spring constant in the vertical direction of the base material 11 in each of the virtual areas A to E is expressed by Equation 1 below.
In Equation 1, kx is the spring constant [N / m] per unit area of the virtual area x (x is A to E), En is the Young's modulus [N / m] (n is the lower plate) of the plate member Tn is the thickness [m] of the plate-like member.

  In the present embodiment, the thicknesses of all the plate-like members are substantially the same (T1 = T2 = T3 = T4 = T5), and the Young's modulus E1 of some plate-like members 13, that is, the lowermost plate-like member 13 is used. Was set sufficiently smaller than the Young's modulus E2 to E5 of the other plate-like members 13 (E1 << E2, E3, E4, E5). Based on the conditions of the plate-like member and the above formula 1, the following formula 2 is established.

As can be obtained from Equation 2, the spring constants kA to kE of the virtual areas A to E are set to be substantially the same. Therefore, as can be obtained from Equation 3 below, in this embodiment, the deflection amount Δx of the bottom surface P1 when the pool P is full is achieved. Further, the deflection amount Δx can be made uniform by selecting each plate-like member so that the vertical resonance frequencies f _{0 of the} virtual areas A to E are substantially the same according to Equation 3. It becomes possible.

Here, the spring constant kx of each virtual area A to E is set within a range of 10 ⁶ to 2 × 10 ⁸ N / m, and the resonance frequency f ₀ of each virtual area A to E is within a range of 5 to 40 Hz. It is preferable to set within. By setting to such a range, the base material 11 has elasticity in all the virtual areas A to E while stably supporting the pool by the base material 11, and vibration during pool use such as swimming is the base. It can be attenuated by the material 11 to obtain a good anti-vibration effect.

In addition, the spring constant kx of each virtual area A to E is set within a range of 1 / 1.7 to 1.7 times the spring constant kx of the adjacent virtual areas A to E, or each virtual area the resonance frequency _{f 0} of A~E is preferably set in the range of 0.7 to 1.3 times the resonance frequency _{f 0} of the virtual area A~E adjacent. By setting to such a range, it is possible to suppress as much as possible the distortion of the bottom surface P1 that occurs when the pool 10 is full, and the quality of the pool is kept good.

Here, in the configuration of FIG. 1, the anti-vibration performance by the base material 11 and the amount of deflection generated on the bottom surface P <b> 1 are examined using the examples in which the conditions of the plate-like member 13 are changed and the comparative examples 1 and 2.
In the examples and the comparative examples, the thickness Tn of all the plate-like members was set to 0.05 [m], and the average water depths of the virtual areas A to E were set to the conditions shown in Table 1, respectively. In the examples and the comparative examples, the Young's modulus En and the spring constant kx of the plate-like member and the resonance frequencies f ₀ of the virtual areas A to E were set to the conditions shown in Tables 2 and 3, respectively. The deflection amount shown in Table 4 is calculated from these conditions and Equation 3, and the transmission loss τ [dB] of the force at each frequency f [Hz] is calculated from Equation 4. The calculation results of the transmission loss of this force are shown in the graphs of FIGS.

Referring to Table 4, in the example and each comparative example, the deflection amount is the smallest in the virtual area A and the largest in the virtual area E. The difference is 0.29 mm in the example and 2 in the comparative example 1. .46 mm and Comparative Example 2 is 0.37 mm. Therefore, the state of distortion generated on the bottom surface P is the largest in Comparative Example 1, and the Example and Comparative Example 2 are relatively the same, but the Example is in the best state.
In addition, in FIGS. 2 to 4, when the example and each comparative example are compared in a low frequency region that is important in considering the propagation of the solid sound of the building, that is, a frequency band of 63 [Hz], the example ( It can be understood that FIG. 2) can stably obtain good vibration isolation performance in all the virtual areas A to E as compared with the comparative examples (FIGS. 3 and 4). In Comparative Example 2, the force transmission loss is larger than that in Comparative Example 1 and Example, such as amplification of 0.6 dB in the virtual area A, and the expected vibration isolation performance cannot be obtained.
Therefore, as in the embodiment, by setting the Young's modulus of the lowermost plate-like member to about 1/5 of the Young's modulus of the other plate-like members, the distortion generated on the floor surface P can be suppressed and necessary. It is possible to ensure the anti-vibration performance.

The best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this.
That is, the present invention has been particularly shown and described with respect to particular embodiments, but is not limited to the embodiments described above without departing from the scope and spirit of the present invention. Various modifications may be made by those skilled in the art in terms of position, orientation, and other detailed configurations.

  For example, the base material 11 is provided in a step shape along the inclination direction of the bottom surface P1, and as long as the spring constant or the resonance frequency is set as described above, the number of the plate members 13 is increased or decreased. Various modifications are possible, such as making 13 various shapes.

Specifically, as illustrated in FIG. 5, one plate member 13 having a different height may be provided in each of the virtual areas A to E, and may be formed in a step shape. In this case, a material having a low Young's modulus is laid in an area where the plate-like member 13 is thin. On the other hand, an area where the plate-like member 13 is thick becomes thick even if a cheap material having a high Young's modulus is laid. Thus, the spring constant can be reduced. As a result, the cost of the material used can be reduced while maintaining the same conditions as in the above embodiment.
Further, as shown in FIG. 6, a plate-like member 13 straddling the virtual area A and the virtual area B and a plate-like member 13 straddling the virtual area C and the virtual area D are laid, and the virtual areas B and D above them are laid. A plate-like member 13 may be further provided at a position corresponding to, and a single plate-like member 13 may be provided in the virtual area D.
Furthermore, as shown in FIG. 7, the thickness of the lowermost plate-like member 13 may be made thicker than other plate-like members 13 (about twice in the figure). It becomes possible to set the spring constant kx of the areas A to E to a closer value.

  In addition, the bottom surface P1 of the pool P is inclined in one direction that decreases from the right to the left in the figure, but instead of this, it is inclined in a plurality of different directions, such as a mortar shape, and the base corresponding to this. The material 11 may be formed and placed.

  Furthermore, the filler 12 may be omitted by using a powdery or granular member, or by forming the upper surface side of the base material 11 along the bottom surface P1.

The schematic sectional drawing which modeled the installation structure of the pool which concerns on embodiment. The graph which shows the transmission loss of the force of an Example. The graph which shows the transmission loss of the force of the comparative example 1. FIG. The graph which shows the transmission loss of the force of the comparative example 2. Sectional drawing similar to FIG. 1 which concerns on a modification. Sectional drawing similar to FIG. 1 which concerns on another modification. Furthermore, sectional drawing similar to FIG. 1 which concerns on another modification. Sectional drawing similar to FIG. 1 which concerns on a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Base material, 13 ... Plate-shaped member, S ... Slab, P ... Pool, P1 ... Bottom

Claims (3)

In the installation structure in which a pool with an inclined bottom is installed above the base material placed on the slab of the building,
The base material is configured using a material having elasticity, and is provided in a staircase shape along the tilt direction.
When each step of the stairs is divided and viewed as a plurality of different virtual areas, the vertical spring constant per unit area in the base material of each virtual area is 1/1 of the spring constant of the adjacent virtual area. A pool installation structure characterized in that it is set within the range of 7 to 1.7 times. The base material is formed by stacking a plurality of plate-like members having different plane areas, and among these plate-like members, some plate-like members have the spring constant set smaller than other plate-like members. The pool installation structure according to claim 1, wherein: In the installation structure in which a pool with an inclined bottom is installed above the base material placed on the slab of the building,
The base material is configured using a material having elasticity, and is provided in a staircase shape along the tilt direction.
When each step of the staircase is divided and viewed as a plurality of different virtual areas, the resonance frequency in the vertical direction in the base material of each virtual area is 0.7 to 1.3 of the resonance frequency of the adjacent virtual area. Pool installation structure characterized by being set within the range of double.

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