JP2012017574A - Vibration isolation block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolation block to be buried underground at a construction site for suppressing transmission of vibration, capable of reducing construction cost.SOLUTION: A vibration isolation block 100, which has an approximately rectangular parallelepiped shape, and is to be buried underground at a construction site for suppressing transmission of vibration, comprises a resin foam part 10 and a weight part 20 that is fixed to the resin foam part 10 so as to be transported to a construction site together with the resin foam part 10 and has a larger weight per unit volume compared to the resin foam part 10.

Description

  The present invention relates to an anti-vibration block, and more particularly to an anti-vibration block that is embedded in the ground at a construction site to suppress transmission of vibration.

  A construction method using a foamed resin block made of lightweight foamed polystyrene as a civil engineering material is conventionally known as an “EPS (Expanded Poly-Styrol) construction method”. This foamed polystyrene material can exhibit the merit of being lightweight when providing a civil engineering structure on soft ground. Moreover, since the said material has self-supporting property, it is possible to reduce the man-hour of retaining wall construction and earth retaining work significantly. As a result, according to the EPS method, it is possible to shorten the construction period (early recovery at the time of a disaster), reduce the construction cost, and the like. Examples of conventional techniques relating to such an EPS method include those described in Patent Document 1 below.

  By the way, it has been conventionally performed to embed the foamed resin block in the ground to suppress vibration propagating in the ground. Such a structure is described in Patent Document 2 below, for example.

JP-A-5-33348 JP 2005-188264 A

  Although also described in Patent Document 2, when a foamed resin block is embedded in the ground to form an anti-vibration block, it is necessary to suppress the foamed resin block from being lifted by buoyancy at a location where the groundwater level is high.

  On the other hand, as in the invention described in Patent Document 2, it is not always sufficient to cancel buoyancy simply by adjusting the porosity and the apparent density. If the above-described buoyancy problem can be easily solved, the construction cost for forming the vibration-proof structure can be greatly reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is an anti-vibration block that is embedded in the ground at a construction site to suppress vibration transmission, and has a construction cost. The object is to provide what can be reduced.

  An anti-vibration block according to the present invention has a substantially rectangular parallelepiped shape and is an anti-vibration block embedded in the ground at a construction site to suppress transmission of vibration, and is constructed together with a foamed resin portion and a foamed resin portion. A weight portion made of concrete or mortar having a unit volume weight larger than that of the foamed resin portion fixed to the foamed resin portion so as to be transportable to the site.

  In one embodiment, the weight part has a projection part that resists buoyancy acting on the vibration isolation block buried in the ground in the vibration isolation block.

  In one embodiment, in the vibration-proof block, the foamed resin portion is made of expanded polystyrene.

  According to the vibration isolating block according to the present invention, it is possible to reduce the construction cost for forming the vibration isolating structure.

It is a figure which shows the anti-vibration structure where the anti-vibration block which concerns on one embodiment of this invention is applied. It is a figure which shows the anti-vibration block which concerns on one embodiment of this invention. FIG. 3 is a diagram illustrating an application example of the image stabilization block illustrated in FIG. 2. It is a figure which shows the other application example of the anti-vibration block shown in FIG. It is a figure which shows the further another application example of the anti-vibration block shown in FIG. It is a figure which shows the further another application example of the anti-vibration block shown in FIG. It is a figure for demonstrating the relationship between the surface area of a foamed resin part, and the thickness of a weight part. It is a figure which shows the application example of the anti-vibration block shown to FIGS.

  Embodiments of the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified.

  FIG. 1 is a diagram illustrating a vibration isolation structure to which a vibration isolation block according to the present embodiment is applied. Referring to FIG. 1, vibration generated by vehicle 1 as a “vibration transmission source” that passes over soft ground propagates in the ground toward house 2 as a “vibration isolation target”. Here, the soft ground with a high groundwater level tends to transmit vibration compared to the ground with a low groundwater level. Therefore, in the example of FIG. 1, the anti-vibration block 100 is embedded in the ground located between the part (the roadway) through which the vehicle 1 passes and the house 2.

  As shown in FIG. 2, the vibration-proof block 100 includes a foamed resin portion 10 made of foamed polystyrene and a weight portion 20. The weight portion 20 has a unit volume weight larger than that of the foamed resin portion 10. The foamed resin portion 10 and the weight portion 20 are integrated in advance at the factory, and the anti-vibration block 100 is conveyed to the construction site in the integrated state.

  In addition, although the weight part 20 which concerns on this Embodiment is formed with concrete or mortar, it can also consider using an iron plate etc. instead of these materials. However, considering the durability when buried in the ground and the adhesion to the foamed resin portion 10, the weight portion 20 is most preferably formed of concrete or mortar.

  In the example of FIG. 2, the weight portion 20 is provided only on two opposing surfaces of the foamed resin portion 10 having a rectangular parallelepiped shape, but the weight portion 20 may be provided only on one surface of the foamed resin portion 10. Then, it may be provided on the four surfaces of the foamed resin portion 10 (see FIG. 3), or may be provided on the six surfaces of the foamed resin portion 10. However, in consideration of operability when the anti-vibration block 100 is transported or embedded in the ground, the weight portion 20 is preferably formed at least on two (facing) two surfaces of the foamed resin portion 10. . By doing in this way, eccentricity of the anti-vibration block 100 can be prevented.

For example, assuming a rectangular parallelepiped foamed resin portion 10 shown in FIG. 7, α = 1 m, β = 2 m, γ = 0.5 m, that is, area (A) [total of two opposing surfaces] = 4 m ² , When the area (B) [total of two opposing surfaces] = 2 m ² and the area (C) [total of two opposing surfaces] = 1 m ² , the weight portion 20 is mortar (the unit volume weight in water is 14 kN). / M ³ ) If the buoyancy (about 9.8 kN) is canceled due to the weight of the weight portion 20, when the weight portion 20 is formed only on two surfaces (A), it is formed with a thickness of 18 cm. On the other hand, when the weight portion 20 is formed on the four surfaces (A + B), a thickness of 12 cm is sufficient, and when the weight portion 20 is formed on the six surfaces (A + B + C), a thickness of 11 cm is sufficient. Thus, the thickness of the weight portion 20 can be reduced by forming the weight portion 20 by being dispersed on many surfaces.

  Next, the function of the image stabilization block 100 will be described. Referring to FIG. 1 again, the vibration propagating from the vehicle 1 is attenuated in the ground. However, if a portion having a large density difference with respect to the ground is provided in the ground, the above-described attenuation rate becomes high. Therefore, providing an air layer in the ground is the most effective anti-vibration measure.

  On the other hand, in soft ground with a high groundwater level, since the voids in the ground are filled with groundwater, the above-described attenuation rate is low and vibrations are likely to propagate. Here, it is conceivable to form an air layer as described above by embedding a hollow casing in the ground, and to take measures against vibrations, but frequently inspect the casing once buried in the ground. Since it is difficult to use and has been used for many years, the housing deteriorates, groundwater may enter the housing, and the air layer may be destroyed. Is not preferable from the viewpoints of maintainability and durability.

Therefore, the vibration isolating block 100 according to the present embodiment includes the foamed resin portion 10 made of expanded polystyrene (for example, unit volume weight = 0.12 to 0.3 kN / m ³ ) having a lower density than the ground. It is intended to prevent vibration. In addition, even if the foamed resin portion 10 is buried in the ground for many years, the groundwater does not penetrate into the gap.

  Next, the function and effect of the weight portion 20 will be described. As described above, the weight portion 20 is for canceling part or all of the buoyancy acting on the vibration isolation block 100. When the anti-vibration block 100 is buried underground, if the buoyancy acting on the anti-vibration block 100 can be canceled, construction can be performed simply by dropping into the excavated groove, and large excavation is not required in advance. When large excavations are performed in advance, it is necessary to perform taper excavation that widens toward the opening or to install a sheet pile on the excavation surface to prevent collapse. If the construction is such that the block 100 is simply dropped into the groove, no countermeasure for preventing collapse is required. For this reason, it is possible to significantly reduce the construction cost for forming the vibration-proof structure.

  Next, further application examples of the image stabilization block 100 will be described with reference to FIGS. The application examples shown in FIGS. 4 to 6 are characterized in that a protruding portion 21 is provided on the weight portion 20. By providing such a protruding portion 21, it is possible to increase the friction between the weight portion 20 and the surrounding ground, and as a result, it is possible to increase the resistance to buoyancy.

  In addition, it is more effective to provide the protruding portion 21 so as to extend in the horizontal direction when the vibration isolating block 100 is embedded in the ground. The anti-vibration block 100 may be installed such that the vertical direction in FIGS. 4 to 6 is a vertical direction, or may be installed so that the vertical direction in FIGS. 4 to 6 is a horizontal direction. As shown in FIG. 6, by providing the protrusions 21 in a cross shape, it is possible to effectively increase the resistance to buoyancy regardless of the direction in which the anti-vibration block 100 is installed.

Further, as shown in FIG. 8, a weight portion 20 may be provided inside the foamed resin portion 10.
The above contents are summarized as follows. That is, the vibration isolating block 100 according to the present embodiment has a substantially rectangular parallelepiped shape, and is an anti-vibration block that is embedded in the ground at a construction site to suppress vibration transmission. The weight portion 20 having a unit volume weight larger than that of the foamed resin portion 10 fixed to the foamed resin portion 10 so as to be transportable to the construction site together with the foamed resin portion 10.

  Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Vehicle (vibration transmission source), 2 House (anti-vibration object), 10 Foamed resin part, 20 weight part, 21 protrusion part, 100 anti-vibration block

Claims (3)

An anti-vibration block that has a substantially rectangular parallelepiped shape and is embedded in the ground at a construction site to suppress vibration transmission,
A foamed resin part;
A vibration-proof part comprising a weight part made of concrete or mortar having a unit volume weight larger than that of the foamed resin part fixed to the foamed resin part so as to be transportable to the construction site together with the foamed resin part block.   The anti-vibration block according to claim 1, wherein the weight portion has a protrusion that resists buoyancy acting on the anti-vibration block embedded in the ground.   The anti-vibration block according to claim 1 or 2, wherein the foamed resin portion is made of foamed polystyrene.

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