JP2504363B2 - Vibration isolation structure of building and its construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vibration isolation technology for buildings, and particularly for halls, audio-visual rooms, recording studios and other buildings where silence is required for railways such as ground lines and subways. The present invention relates to a vibration insulating structure of a building and a construction method thereof so as not to be affected by noise, vibration, etc. due to the underground propagation vibration.

[0002]

2. Description of the Related Art When constructing a building including a facility such as a concert hall, an audio-visual room or a recording studio where silence is required (hereinafter, such facility is simply referred to as "hall facility"), In order to ensure the quietness of a large hall facility, it is necessary to prevent it from being affected by noise and vibration from the surrounding area of the building. As such noise and vibration, underground propagation vibration due to a ground line near the building or a railway such as a subway is a particular problem.

As a measure against noise and vibration due to underground propagation vibration of railways and the like, at the time of construction of a building, an underground continuous wall as a retaining wall and this underground continuous wall on the vibration source side of the building. Cushioning material for vibration isolation between the building and the building foundation (for displacement due to vibration, "expansion joint (expansion joint
) ”) And a combination structure of underground continuous walls and cushioning materials, or the hall facility itself, which requires quietness in the building, is attached to the building body through an appropriate elastic support member. By combining them, the hall facility is floated from the main body of the building together with the room, and a floating structure is used that is completely separated in a vibrational manner.

(I) [Vibration Insulation Structure Combining Underground Wall and Cushioning Material] As shown in FIG. 11, on one side surface to four peripheral surfaces of the foundation of the building body B where the hall facility H is installed. Correspondingly, a continuous earth retaining wall, that is, an underground continuous wall W is formed in the ground, and a structure in which a cushioning material J such as expanded polystyrene is sandwiched between the underground continuous wall W and the foundation of the building main body B, Insulates underground vibration from vibration source S such as subway tunnel.

In this case, the underground continuous wall W has an effect of blocking or attenuating the vibration to the vibration source S as if it were a soundproof wall on the ground, and reduces the propagation of the vibration inside and outside the continuous wall W. . As the underground continuous wall W for vibration isolation, it is necessary to use a material having a higher specific gravity than the surrounding earth and sand in order to utilize the reflection of waves due to the difference in material density. For example, reinforced concrete (RC)
concrete) is preferable. It is possible to use a soil cement wall (SMW: soil mixing wall) as the underground continuous wall W in the same way as a general earth retaining wall, but since the specific gravity is not much different from the surrounding sediment, the effect cannot be expected so much. It may become assimilated with the surrounding soil due to aging. For the same reason, the cushioning material J for vibration isolation is used.
However, it is necessary to use a material having a low specific gravity with respect to the mountain retaining wall, such as expanded polystyrene.

(Ii) [Floating Structure] As shown in FIG. 12, the hall facility H itself, which requires quietness in the building body B, is
Then, the cushion material C such as glass wool and the elastic supporting member such as the vibration-proof rubber R are completely floated and supported from the frame to be vibrationally separated from the building body B. That is, in the hall facility H, the floor, the ceiling, and the walls are supported by the body of the building body B via elastic supporting members that are less likely to propagate vibration, and are isolated from ambient vibration.

[0007]

As described above, as countermeasures against noise and vibration due to underground propagation vibration of railways, etc.,
Mainly, a vibration insulating structure by a combination of the underground continuous wall W and the cushioning material J, or a floating structure for vibration isolation by an elastic supporting member is used. The vibration insulating structure using the combination of the underground wall W and the cushioning material J has the following problems.

The earth retaining wall which is the underground continuous wall W is not originally considered as a means for vibration isolation, and is originally a protective means for preventing the surrounding soil from collapsing.
The basic role is to protect the surrounding soil from sinking or displacing to the side, even if it does not collapse, and keep it in a safe state. On the other hand, the larger the building body B is, the more labor is required to construct the wall and the like, and the enormous cost of building materials is required. For this reason, it is expected to use a soil cement wall that is cheaper than reinforced concrete and simple in construction, but as mentioned earlier, it is difficult to obtain the required vibration insulation effect with a soil cement wall. is there.

The depth of the underground wall W for vibration isolation is
It depends greatly on the depth of the vibration source S, such as the depth of the elevated ground wire pile or the depth of the subway tunnel. If the depth of the vibration source S is too deep, the underground continuous wall W will be constructed. It may not be possible. In addition, the combined structure of the underground underground wall W and the cushioning material J is not easy to predict the vibration isolation effect, and depending on the size of the vibration source S, there may be some ("complete" or "floor" in the hall facility itself. In some cases, it may be necessary to use a floating structure (such as "only" or "only wall"), which will significantly affect the construction cost.

Further, the floating structure in which the elastic support member is used for vibration isolation has the following problems. In terms of cost, the floating structure that is vibration-isolated by the elastic support member has
It is a little cheaper than the combination structure with. However, in this floating structure, the hall facility H insulates the vibration propagating route including the propagating route by the indoor piping in the building body B from the vibration propagating from the outside to the building body B. However, it must be completely cut off. For this reason, it is necessary to check all the vibration propagation paths over the entire building, which makes the construction supervision during construction very complicated.

The present invention has been made in view of the above-mentioned circumstances, and has a simple construction and a low construction cost.
It is an object of the present invention to provide a vibration insulating structure for a building that can be easily constructed and supervised, and can achieve effective vibration insulation, and a construction method thereof.

[0012]

A vibration isolation structure for a building according to the present invention comprises a cushioning material layer which is disposed so as to cover the entire periphery and bottom surface of a building foundation portion buried in the ground. The cushioning material layer is further provided with an earth retaining wall layer formed so as to cover the outer circumference and the bottom surface.

A method of constructing a structure for vibration isolation of a building according to the present invention comprises a cushioning material layer disposed so as to cover the entire periphery and bottom surface of a building foundation embedded in the ground, and this cushioning material. In constructing a vibration insulation structure for a building that further comprises an earth retaining wall layer formed so as to cover the outer periphery and bottom surface of the layer, forming a peripheral wall of the earth retaining in the ground on the lateral side of the building. 1 step, a second step of excavating the inside of the peripheral wall in which the foundation of the building body is to be buried after forming the earth retaining wall, and the bottom of the earth retaining on the bottom of the excavated portion by the second step. A third step of forming a wall, a fourth step of laying a bottom cushion on the bottom wall, and forming at least a part of the bottom layer of the building body foundation on the bottom cushion, A groove having a predetermined width reaching the bottom cushioning material at the periphery of at least a part of the bottom layer. And a sixth step of forming at least a foundation portion of the building body on at least a part of the bottom layer, and a peripheral cushioning material so as to surround the foundation portion of the building body in the groove. And a seventh step of standing up the plate.

[0014]

In the structure for vibration isolation of a building and the method of constructing the same according to the present invention, a cushioning material layer is provided so as to cover the entire periphery and bottom surface of a building foundation embedded in the ground. With the vibration insulation structure that further covers the outer periphery and bottom of the layer to form the earth retaining wall layer, the entire building can be floated by the cushioning material, so the construction cost is low, construction and construction supervision are easy, and the construction is simple. Effective vibration isolation can be achieved.

In this vibration insulating structure, a peripheral wall of earth retaining is formed in the ground on the lateral side of the building, and the inside of the peripheral wall where the foundation of the main body of the building is to be buried is excavated. A bottom wall of earth retaining is formed on the bottom surface of the part, a bottom cushioning material is laid on the bottom wall, and at least a part of the bottom layer of the building body foundation is formed on the bottom cushioning material, and the bottom layer A groove portion having a predetermined width that reaches the bottom cushioning material is formed on at least a peripheral edge of at least a part of the bottom surface layer, at least a base portion of the building body is formed on at least a part of the bottom surface layer, and a foundation of the building body is formed in the groove portion By surrounding the cushioning material plate so as to surround the portion, the construction can be easily performed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a vibration isolation structure for a building according to an embodiment of the present invention. In this example,
The entire building main body B having the hall facility H is floated by a cushioning material such as expanded polystyrene, and the outside of this cushioning material layer is covered with an earth retaining wall layer for vibration isolation. Inside the building body B, a hall facility H that requires silence is installed. A cushioning material layer 11 made of, for example, expanded polystyrene, expanded polyurethane, or the like is provided so as to cover the entire periphery and bottom surface of the foundation portion embedded in the ground of the building body B. A soil retaining wall layer 12 made of, for example, a soil cement wall or a reinforced concrete is disposed outside the cushioning material layer 11 so as to cover the outer periphery and the bottom surface of the cushioning material layer 11.

That is, the building body B having the hall facility H has the cushioning material layer 1 at the foundation portion buried in the ground.
1 and the earth retaining wall layer 12 are vibration-insulated by the double structure and installed. In addition, for convenience of construction and to increase the vibration insulation effect, a vibration source S such as a subway tunnel is used.
The earth retaining wall layer 12 facing the above may be arranged so as to protrude below the bottom surface of the earth retaining wall layer 12 as shown by an imaginary line in FIG. 1. According to such a structure in which the building body B is vibration-insulated by the double structure of the cushioning material layer 11 and the earth retaining wall layer 12, the following advantages can be obtained.

(A) Since the skeleton of the building body B is floated by the cushioning material layer 12, the vibration insulation effect does not depend on the depth of the vibration source S. (b) Since it is not necessary to consider vibration propagation due to so-called wraparound, it is possible to predict the vibration insulation effect, and it is possible to design including the prediction of the vibration insulation effect. (c) The structure is simple compared to the floating structure, and the construction is easy despite the large effect. (d) Compared with a structure that supports the bottom of the building body through seismic isolation structures that are often used for earthquake countermeasures, such as seismic isolation rubber (an alternate laminated structure of plate-shaped anti-vibration rubber and iron plates), It can be constructed at low cost without the cost of seismic isolation rubber. (e) Since the foundation of the building main body B is surrounded by the cushioning material and the earth retaining wall, there are few restrictions on the specifications of the earth retaining wall, and even if it is not reinforced concrete, the soil cement wall for water stop of the normal construction method, Even if the backfill of miscellaneous concrete is adopted for the earth retaining wall, a sufficient effect can be expected.

Next, with reference to FIGS. 2 to 9, a method of constructing the vibration insulating structure for a building according to this embodiment will be specifically described. (1) As shown in FIG. 2, an earth retaining wall 21 which is a continuous earth retaining wall is formed in the ground on the side of the building.
At this time, the surrounding earth retaining wall is formed in the ground on the other side of the building. The surrounding earth retaining wall is formed, for example, by pouring a soil cement wall or reinforced concrete. (2) After forming the earth retaining wall 21 and the like, as shown in FIG. 3, excavate the inner portion surrounded by the surrounding earth retaining wall where the foundation of the building body is to be buried, and form the floored surface 22. At the same time, the earth anchor 23 is driven into the surrounding ground from the earth retaining wall 21 or the like.

(3) As shown in FIG. 4, an earth retaining bottom wall 24 is formed on the floor-attached surface 22 which is the bottom surface of the excavation portion. The earth retaining bottom wall 24 is an earth retaining wall formed by placing discarded concrete or the like. (4) As shown in FIG. 5, a bottom cushioning material 25 made of, for example, expanded polystyrene plate material is laid on the earth retaining bottom wall 24, and a square material 26 of a predetermined size is attached to the peripheral portion thereof. (5) As shown in FIG. 6, on the earth retaining bottom wall 24, the bottom cushioning material 25 is covered, and further the concrete layer 27 is formed by casting until the upper surface thereof coincides with the upper surface of the square member 26. The concrete layer 27 is integrated with the earth retaining bottom wall 24 on the outer side of the timber 26 to form the earth retaining bottom wall 28.
Inside 6, the concrete layer 29 forms at least a part of the bottom layer of the building body foundation.

(6) The square member 26 is removed to form a groove 30 as shown in FIG. (7) As shown in FIG. 8, at least a base portion of the building body 31 is formed on at least a part of the concrete layer 29, and the groove 30 is further fitted with an edge so that the building body 31 A surrounding cushioning material plate 32, which is also made of expanded polystyrene plate material, is erected to surround the base portion. (8) As shown in FIG. 9, the space between the surrounding earth retaining wall 21 and the surrounding cushioning material plate 32 is backfilled with concrete 33, for example. Thus, when backfilling with the concrete 33 is performed, the concrete is connected to the outside of the cushioning material layer (25, 32) in a shell shape by this and the earth retaining bottom wall 28, and the cushioning material layer and the retaining earth wall layer are combined. The double structure is completed.

In this case, since the space between the surrounding earth retaining wall 21 and the like and the surrounding cushioning material plate 32 is backfilled with concrete 33, the surrounding earth retaining wall 21 and the like as the mountain retaining is a soil cement wall. There is no problem at all. Even if the surrounding earth retaining wall 21 composed of the soil cement wall is assimilated with the earth and sand due to the secular change of the soil cement wall,
As shown in FIG. 10, due to the concrete earth retaining wall layer 34 in which the backfilled concrete 33 and the earth retaining bottom wall 28 are connected in a shell shape, a double structure with the cushioning material layer 35 is formed around the foundation of the building body 31. Is formed. By doing so, it is possible to construct a vibration insulating structure that surrounds the foundation of the building body 31 with a double structure of the cushioning material layer and the earth retaining wall layer at low cost and easily.

2 of such a cushioning material layer and an earth retaining wall layer
The vibration insulation structure surrounded by the heavy structure is simpler in structure and easier to construct than the floating structure mentioned above, and the cost is lower than the seismic isolation structure. It is relatively easy, and the effect of vibration isolation is great.

[0024]

As described above, according to the present invention,
A vibration insulation structure in which a cushioning material layer is provided so as to cover the entire circumference and bottom surface of a building foundation embedded in the ground, and the earth retaining wall layer is formed by further covering the outer circumference and bottom surface of this cushioning material layer. The whole structure is floated by the cushioning material, and the construction cost is low, the construction cost is low, the construction and the construction supervision are easy, and the effective vibration isolation of the building can be achieved. A structure and its construction method can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a configuration of an example of a vibration isolation structure for a building according to the present invention.

FIG. 2 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the embodiment of FIG.

FIG. 3 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the embodiment of FIG.

FIG. 4 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the embodiment of FIG.

5 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the embodiment of FIG.

FIG. 6 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the embodiment of FIG.

FIG. 7 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the example of FIG.

8 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the embodiment of FIG.

FIG. 9 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the embodiment of FIG.

FIG. 10 is a schematic cross-sectional view for explaining a method of constructing a vibration insulation structure for a building in the example of FIG.

FIG. 11 is a cross-sectional view schematically showing the configuration of a conventional example of a vibration isolation structure for a building.

FIG. 12 is a cross-sectional view schematically showing the configuration of another example of the conventional vibration insulating structure for a building.

[Explanation of symbols]

11, 35 ... buffer layer, 12, 34 ... earth retaining wall layer, 3
1, B ... Building body, H ... Hall facility.

Claims (2)

(57) [Claims] 1. A cushioning material layer disposed so as to cover the entire circumference and bottom surface of a building foundation embedded in the ground, and soil formed to further cover the outer circumference and bottom surface of this cushioning material layer. A vibration insulation structure for a building, comprising a retaining wall layer. 2. A cushioning material layer disposed so as to cover the entire periphery and bottom surface of a building foundation embedded in the ground, and soil formed to further cover the outer periphery and bottom surface of this cushioning material layer. When constructing a vibration insulation structure for a building including a retaining wall layer, a first step of forming a peripheral wall of an earth retaining wall in the ground on the lateral side of the building; A second step of excavating the inside of a peripheral wall in which the foundation part of the object body is to be buried; a third step of forming a bottom wall of earth retaining on the bottom surface of the excavation part by the second step; A fourth step of laying a bottom cushioning material on the bottom, and forming at least a part of the bottom layer of the building body foundation on the bottom cushioning material, and the bottom cushioning on the periphery of at least a part of the bottom layer. A fifth step of forming a groove portion having a predetermined width reaching the material, and reducing the bottom layer And a sixth step of forming at least a base portion of the building body on a part thereof, and a seventh step of standing a surrounding cushioning material plate so as to surround the foundation portion of the building body in the groove portion. A method for constructing a vibration isolation structure for a building, characterized by: