JPH01102155A - Floor structure - Google Patents

Abstract

PURPOSE: To provide a floor structure which is lightweight and is excellent in sound insulation by forming a rectangular wave-like shape vibration suppressing steel panel in which a viscoelastic material is interposed between two metal plates, so as to constitute a deck plate on which concrete is placed. CONSTITUTION: Concrete 12 is placed on a deck plate 11 in which a vibration suppressing steel panel composed of two steel plates 10a and a viscoelastic material 10b interposed between the two steel plates 10a, is formed in a rectangular wave-like shape. When the vibration suppressing steel panel 10 is vibrated, the viscoelastic material 10b interposed between the steel plates repeats shearing deviation so as convert vibration energy into thermal energy in order to absorb the vibration. Thus, high vibration suppressing effect can be obtained. Thereby it is possible to obtain high sound insulation even though the thickness of the concrete 12 is decreased.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in floor structures.

[Prior Art] House floors are generally constructed of reinforced concrete, except for light structures such as single-family homes and low-rise apartment complexes. Reinforced concrete structures are also common for floors in office buildings.

In floors of such reinforced concrete structures, floor impact noise on the lower floors caused by walking on the upper floors, children jumping, etc. is a problem, and various countermeasures have been considered.

First, when a falling automobile tire is used as an impact source according to JIS-A141g, the sound insulation performance of a concrete floor improves with the thickness of the concrete. Ignoring slight variations, -a concrete floor with a thickness of 120mm in the membrane is L-
A thickness of 60,150 mm is said to have a sound insulation rating of L-55. The above sound insulation grade is JIS-A14.
19, and the smaller the value, the higher the sound insulation.

Furthermore, as shown in Fig. 5, there is a double-floor structure in which a concrete floor is used as the base, and methods such as (a) floor construction method, (b) Nedaform construction method, and (C) wooden joist floor construction method are constructed on top of the concrete floor. The floor construction method is 1.
A particle board 2 is placed on a concrete floor 1 with a thickness of 50 mm via a cushion rubber 5, and a plywood 3 and a flooring 4 are placed on top of the particle board 2.
The Nedaform construction method uses the same concrete floor 1 with foamed plastic 6, veneer plywood 3, and flooring 4, and the wooden joist floor construction method uses the same concrete floor 1 with 8 large pulls and 7 joists.
The flooring 4 is placed between the two.

Table 1 shows the results of constructing these double floor structures and measuring the sound insulation grade against falling tires before and after constructing the double floor. As is clear from Table 1, no improvement in sound insulation performance was observed with the double floor structure, and better sound insulation performance was shown with the concrete floor as it was.

Table 1 Until now, there was no effective way to improve the sound insulation performance of floors other than increasing the thickness of concrete.
In 1981, the Housing and Urban Development Corporation changed the thickness of concrete from 110 to 120 mm to 150 mm. Since then, private housing manufacturers have followed suit, and the current length is 150m.
m thickness is becoming common.

[Problems to be Solved by the Invention] By the way, when the thickness of the concrete floor is set to 150 mm, the following problems have been pointed out.

(1) Increase in floor weight (2) Large increase in seismic load due to this (3) As a result, increase in the cross section of building frames such as beams, columns, foundations, etc. (4) Increase in the number of piles when located on soft ground The increase in concrete thickness to improve sound insulation poses a serious problem.

The present invention was made to solve the problems of conventional concrete floor structures, and aims to provide a lightweight floor structure with excellent sound insulation properties.

[Means for Solving the Problems] In order to achieve the above object, the floor structure according to the present invention is constructed by pouring concrete onto a deck plate formed by forming damping steel plates into a continuous rectangular wave shape. ing. The damping steel plate is made by sandwiching a viscoelastic substance between two steel plates.

[Operation] When the above-mentioned vibration-damping steel plate receives vibration, the viscoelastic material sandwiched between the steel plates repeats the vibration and shear displacement, converting the vibration energy into thermal energy and absorbing the vibration, as shown in Figure 3. It has great vibration damping properties.

The floor structure according to the present invention is configured as described above, and since the deck plate with high vibration damping properties has sound insulating properties, it has sufficient sound insulating properties even if the thickness of the concrete is made thin.

[Embodiment of the invention] Fig. 1 is a sectional view of a floor structure showing an embodiment of the invention, Fig. 2 is a sectional view of a floor structure showing an embodiment of the invention.
The figure is a cross-sectional view of a damping steel plate, and in the figure 10 is a vibration damping steel plate;
a is a steel plate, 10b is a viscoelastic material, 11 is a deck plate, 12 is concrete, D is the depth of the deck plate, t
is the thickness of the concrete.

In the figure, D-50~75mm5 T-80~10Q
mm, and the thickness of the damping steel plate is about 0.8 to 1.6 mm.

The floor structure according to the present invention is classified into the following three categories in terms of structural design.

(1) A design concept that allows the deck plate to function as a formwork and also assumes load-bearing performance as a composite floor integrated with concrete.・ (2) A design concept in which the deck plate is considered to be a permanent concrete formwork, and the applied load is resisted only by reinforced concrete.

(3) A design concept that ignores the structural load-bearing capacity of concrete and supports the load only with deck plates.

In the present invention, any of the above three design concepts can be selected, but the concept (1) of a synthetic floor is the most useful for reducing the weight of the floor.

In Figure 1, the total thickness of the two steel plates, D-50mm and T-50mm5 damping steel plates, is 1.6mm, and the above (3)
Figure 4 shows the measurement results of the impact sound of a tire falling on a floor manufactured using the design concept of . In the figure, A is a line diagram of the measurement results of the floor structure, and B is a line diagram of the measurement results of the floor structure in which the damping steel plate of the floor structure is replaced with a 1.6 mm thick ordinary steel plate.

According to FIG. 4, when a damping steel plate is used, an improvement in sound insulation performance of about 3 dB can be expected compared to a normal steel plate. This is expected to be almost the same as the sound insulation performance when ordinary steel plates are used and the concrete thickness is 100 mm, and the structure of the present invention using damping steel plates has the same sound insulation performance but the concrete thickness is 50 mm. It will be fine. In other words, the floor weight can be reduced by 120 kg per meter.

[Effects of the Invention] Since the floor structure according to the present invention is constructed by pouring concrete onto a deck plate formed from vibration-damping steel plates,
I was able to produce some excellent results as described below.

(1) Due to the vibration energy absorption effect of the distributed steel plate, the thickness of the concrete layer can be reduced to 1.5 liters while maintaining the same sound insulation performance as before.

(2) This reduces the weight of the floor, reducing the burden on the frame structural elements such as beams, columns, and foundations.

(3) Since the thickness of the floor concrete can be made thinner, the overall height of the building can be reduced, making it possible to meet the height restrictions stipulated by the Building Standards Act, and also reducing costs by reducing the amount of walls. Become.

(4) As mentioned above, the rationalization of the building as a whole has been achieved, and the contribution to the architectural world is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a floor structure showing one embodiment of the present invention;
The figure is a cross-sectional view of a damping steel plate, Figure 3 is a line diagram showing the damping performance of a vibration-damping steel plate, Figure 4 is a line diagram showing sound insulation performance, and Figure 5 is a cross-sectional view of a conventional double floor structure. be. In the figure, 10 is a damping steel plate, 11 is a deck plate, and 12 is concrete. 〒

Claims (2)

[Claims] (1) A floor structure characterized by being constructed by pouring concrete onto a deck plate made of vibration-damping steel plates molded into a continuous rectangular wave shape. (2) The floor structure according to claim 1, wherein the vibration damping steel plate is formed by interposing a viscoelastic substance between two steel plates.