JPH10204873A - Vibration isolation and soundproof underground wall and execution thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a vibration isolation and soundproof underground wall by pilled-up weight of foaming plastic blocks down to a deep part in soil by reducing buoyancy of the foaming plastic blocks in combination with weight of concrete and the like, and performing settling without influence of muddy water in the ditch wall. SOLUTION: A foaming styrene unit block 3 is constituted of U-shaped foaming styrene 31 of required length in combination with weight material of concrete 32 and the like of its inside, and buoyancy thereof is reduced. An underground wall 1 is positioned in soil, the surface is made one wall body formed by foaming styrene, and sound and vibration in soil are isolated by the foaming styrene 31 of the wall body surface and the weight material of the inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration / sound-proof underground wall made of a foamed plastic block and a method of constructing the same.

[0002]

A foam made of a plastic such as styrene resin as a base material has been widely used as a soundproofing material because of its sound absorbing property. In addition, since it has a foam-like structure due to fine foaming of a foaming agent mixed with plastic, it also has a vibration absorbing property and a heat insulating property, and is used as a vibration insulator for various devices. However, it is mostly used on the ground, and vibration and sound insulation in soil are still in the experimental stage.

According to the data so far, it has been confirmed that even when a styrofoam block is inserted into a 50 mm wide trench excavated in the ground to form an underground wall, there is a vibration isolation effect. Therefore, it can be said that it is sufficiently possible to block the sound and vibration in the soil with the underground wall made of the foamed plastic block.

However, when constructing the underground wall with the foamed plastic block, it is necessary to solve the buoyancy, which is also called the characteristic of the foamed plastic. The trench wall excavated deep in the soil is filled with muddy water that prevents the collapse of the soil wall, and foam plastic blocks are submerged in this muddy in order, piled up from the groove bottom to the ground, and It is technically difficult to do so. Unless this buoyancy is reduced by some means so as not to affect the subsidence of the block, it is not possible to construct an anti-vibration and soundproof ground wall with a foamed plastic block.

[0005] Further, even if the underground wall can be constructed by the foamed plastic block by discharging the muddy water in the groove wall, the buoyancy of the underground wall formed there against the groundwater is extremely large, so that long-term stability is obtained. There is also a problem that in a region where groundwater is likely to be generated as the ground, it is difficult to employ a vibration-proof and soundproof underground wall made of a foamed plastic block.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the buoyancy of a foamed plastic block constituting an underground wall by combining it with a heavy object such as concrete, and to provide a groove wall. In addition to facilitating submersion in muddy water inside, even underground walls composed of piles of foamed plastic blocks remain stable for a long time without being affected by groundwater, -It is to provide a new underground wall which can surely achieve a soundproofing effect and a construction method thereof.

[0007]

The underground wall according to the present invention for the above object comprises a composite of a U-shaped groove-shaped foamed plastic of a required length and a heavy material such as concrete therein. Due to the stacking of the unit blocks of foamed plastic whose buoyancy has been reduced by the heavy object, the surface is located in the soil to form a single wall formed of the foamed plastic, and the sound and vibration in the soil are blocked. It is configured so as to be blocked by the foamed plastic on the body surface and the heavy object inside.

Further, the construction method of the present invention comprises a composite of a foamed plastic of a required length formed in a U-shaped groove and a heavy object such as concrete packed therein.
The unit blocks of foamed plastic whose buoyancy has been reduced by the heavy objects are excavated in the soil, sequentially laid down in the groove wall filled with muddy water, stacked from the groove bottom to the top of the groove wall, and by these unit blocks, Forming one wall body whose surface is formed of the above-mentioned foamed plastic located in the groove wall, narrowing the gap between the wall body and the groove wall to reduce the sound and vibration in the soil to foam the wall surface The underground wall is cut off by plastic and heavy objects inside.

The base material of the foamed plastic used in the present invention may be a styrene resin, a vinyl chloride resin, a polyethylene resin, a polyurethane, a cellulose acetate, or other semi-rigid materials.

[0010]

1 and 2 schematically show an underground wall 1 according to the present invention in a soil 2. The underground wall 1 is formed by digging a required number of unit blocks 3 as shown in FIG. Stacked in order at the top,
Each is composed of one wall, and the space around the wall is 6
And set it in the soil 2.

The unit block 3 is composed of a composite of a polystyrene foam 31 of a required length formed in a U-shaped groove shape and a heavy object made of concrete 32 packed in the inside thereof. The width and length can be arbitrarily set according to the requirements, but the width and length are limited to the range that can be accommodated in the excavation trench in the soil by the horizontal multiaxial pit.

In such a unit block 3, the buoyancy of the styrofoam 31 is reduced by the weight of the concrete 32, and even if the groove wall 4 is filled with muddy water for preventing collapse of the earth wall surface, the buoyancy is calculated in advance. With the weight set from, it can be submerged in muddy water without being affected by buoyancy.

For example, the height (H) shown in FIG.
m, the width (D) 900 mm, when the unit block 3 of the length (L), the dimensions of styrofoam _{h 1, d 1, d 2} : 200mm, the size of the concrete _{h 2: 800mm, d 3:} 500mm, the The setting allows the unit block 3 to sink. Buoyancy of mud water (specific gravity 1.06) Up Up = 1.00 × L × 0.90 × 1.06 t / m ³ =
0.954L _t · Styrofoam weight W _E (specific gravity _{0.02) W E = (0.90-0.40)} L × 0.02t / m 3 =
0.01 L _t · Concrete weight W _c (specific gravity 2.4 t / m ³ ) W _c = 0.80 × L × 0.50 × 2.42.4 t / m ³
= 0.960L _t

[0014] Thus, the unit block 3 becomes larger than the buoyancy and easily sinks in the muddy water to constitute the underground wall 1 even if the unit block 3 is made of the styrene foam 31.

In the underground wall 1 formed deep in the soil by the stacking of the unit blocks 3, the wall surface is formed by styrofoam 31, and the styrofoam 31 and the concrete 32 in the inside make the soil from the vibration source. Sound and vibration that propagate through the inside and reach the underground wall 1 are blocked by being absorbed or reflected. Further, by combining the styrofoam 31 and the concrete 32, sound and vibration of different frequency components can be effectively acted on.

FIG. 4 is an explanatory view of the construction of the underground wall 1. First, an excavation groove 7 is provided in the soil 2 by a horizontal multiaxial pit, and the excavation groove 7 is filled with muddy water 8 to prevent collapse of the soil wall. . While performing this excavation work at regular intervals, the unit block 3 is laid down in the previously completed excavation groove 7.

The laying operation is performed after the guide plate 9 is erected. A pair of guide plates 9 are inserted into both ends of the excavation groove 7 up to the groove bottom 5 and are opposed to each other as shown in FIG. The unit block 3 is sunk by sequentially suspending it between the guide plates 9.
By sinking the inside to the groove bottom 5.

The unit blocks 3 are gradually settled on the lower unit blocks 3 without being rapidly settled due to the buoyancy resistance of the muddy water 8 without being settled, and a wall is formed as the number increases. At the end, the underground wall 1 reaches the ground as shown in FIG. Further, the muddy water 8 is naturally pushed out of the excavation groove 7 to the ground and drained every time the unit block 3 sinks, and only slightly remains in the gap around the wall. As a final treatment, fill the gap with sand, etc. 6
Then, the underground wall 1 is installed in the ground 2 as shown in FIG.

In this construction description, a pair of guide plates 9 is employed as a means for ensuring the stacking of the unit blocks 3. However, this is merely an example, and the stacking can be performed reliably. If so, it is possible to adopt sinking by other means. Also in the embodiment, the underground wall is installed at intervals, but the underground walls can be connected to each other to be continuous. Further, the form of the unit block 3 is not limited to the illustrated one, and a form that further ensures the stacking of the unit blocks by the fitting means or the like can be adopted.

As described above, in the underground wall of the present invention, the vibration-proofing and vibration-reducing effect of the foamed plastic and the heavy object such as concrete are greater than in the case of the foamed plastic alone.
The soundproofing effect is further improved, and it has a heat insulating effect even against soil temperatures. In addition, since the construction obstacles due to buoyancy are eliminated by compounding the foamed plastic block with the heavy object, even if the underground wall is formed by stacking the foamed plastic block, the vibration and soundproof wall is deep underground. Can be installed, and it is in a stable state for a long time without being affected by groundwater even after installation, so that it can be sufficiently adopted even in an area where groundwater is likely to be generated as ground. Again and again
Since the underground wall is based on the stacking of the unit blocks, it is possible to manufacture the factory, and the work on site is only excavation of the trench wall, laying down of the unit block, filling up around the wall, saving labor as well as shortening the construction period. Become.

[Brief description of the drawings]

FIG. 1 is an elevational view schematically showing an anti-vibration / sound-proof ground wall according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a perspective view of a unit block of an underground wall.

FIG. 4 is an explanatory view of a method for constructing an anti-vibration and sound-insulating underground wall according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground wall 2 Underground 3 Unit block 4 Groove wall 5 Groove bottom 6 Filling 7 Excavation groove 8 Muddy water 9 Guide plate 31 Styrofoam 32 Concrete

Claims (2)

[Claims] 1. A unit block of a foamed plastic formed of a U-shaped groove formed of a composite of a foamed plastic of a required length and a heavy object such as concrete therein, the buoyancy of which is reduced by the heavy object. Due to the stacking of the unit blocks, one surface is formed in the soil and the surface is formed by the foamed plastic, and the sound and vibration in the soil are compared with the foamed plastic on the surface of the wall and the heavy object inside. An anti-vibration / sound-proof underground wall, characterized in that it is configured to be shut off by a barrier. 2. A unit of a foamed plastic formed of a U-shaped groove and formed of a composite of a foamed plastic of a required length and a heavy material such as concrete packed therein, the buoyancy of which is reduced by the heavy material. Blocks are excavated in the soil, laid in order in the trench wall filled with muddy water, stacked from the trench bottom to the top of the trench wall, and the unit blocks are located in the trench wall and the surface is formed by the above-mentioned foamed plastic. An underground wall that forms a single formed wall, closes the gap between the wall and the groove wall, and blocks sound and vibration in the soil with foamed plastic on the wall surface and heavy objects inside A method for constructing an anti-vibration / sound-proof underground wall, characterized by comprising: