JP2015078577A - Vibration proof underground wall and sandbag for the same - Google Patents
Vibration proof underground wall and sandbag for the same Download PDFInfo
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- JP2015078577A JP2015078577A JP2013217859A JP2013217859A JP2015078577A JP 2015078577 A JP2015078577 A JP 2015078577A JP 2013217859 A JP2013217859 A JP 2013217859A JP 2013217859 A JP2013217859 A JP 2013217859A JP 2015078577 A JP2015078577 A JP 2015078577A
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- 239000000463 material Substances 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 26
- 239000002689 soil Substances 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 239000004568 cement Substances 0.000 claims abstract description 6
- 230000001902 propagating effect Effects 0.000 claims description 7
- 239000012508 resin bead Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 7
- 229920006248 expandable polystyrene Polymers 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920006328 Styrofoam Polymers 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
Description
本発明は、建設工事現場、工場、鉄道、道路等の振動発生源から地盤を伝播してくる振動を遮断する防振地中壁および防振地中壁用土嚢袋に関する。 The present invention relates to an anti-vibration ground wall and a sandbag for an anti-vibration ground wall that blocks vibration propagating through the ground from vibration sources such as construction sites, factories, railways, and roads.
地中に連続壁もしくは空溝を設けて地盤を伝播してくる振動を遮断する方法は公知の事実であり、実際に鋼矢板やコンクリートを構造材とした振動遮断工法が実施されている。 It is a well-known fact that a continuous wall or an air groove is provided in the ground to block vibration propagating through the ground, and a vibration blocking method using a steel sheet pile or concrete as a structural material is actually being carried out.
具体的には、地盤の剛性より十分に固い材料を用いて、振動の波長、すなわち地盤振動伝播速度を問題となっている振動の周波数で除した値、の１／４程度より深い壁を地中に構築するもので、これを１枚の連続地中壁とする、もしくはこれを２重に構築してその間を掘削して空溝とした構造となっている。 Specifically, using a material that is sufficiently harder than the rigidity of the ground, a wall deeper than about 1/4 of the vibration wavelength, that is, the value obtained by dividing the ground vibration propagation speed by the frequency of the vibration in question. It is constructed inside, and this is used as a single continuous underground wall, or it is constructed in a double structure and excavated between them to form an empty groove.
防振性能は、振動の波長に対して壁や溝が深いほど高く、また比重と剛性を乗じて求める壁材のインピーダンスと地盤のインピーダンスの比が大きいほど防振性能が高い、という性質がある。これは、壁の構築深さを深くするほど壁の下部から回折するための距離が長くなるので振動が低減する一方、壁材と地盤のインピーダンス比が高いほど境界面での反射が増えて透過する振動が低減することに起因しているためである。 The anti-vibration performance is higher as the walls and grooves are deeper with respect to the vibration wavelength, and the higher the ratio of the impedance of the wall material and the impedance of the ground obtained by multiplying the specific gravity and rigidity, the higher the anti-vibration performance. . This is because the greater the wall construction depth, the longer the distance to diffract from the lower part of the wall, so the vibration is reduced. On the other hand, the higher the impedance ratio between the wall material and the ground, the greater the reflection at the interface and transmission. This is because the vibration that occurs is reduced.
また、振動遮断の手法を空溝にすることにより、対向する溝壁面を透過する振動をゼロにして、溝下部からの回折による振動の伝播のみに限定することができる。
ただし、振動の波長は周波数が低いほど長くなる。これに対応するべく壁等の深さを深くするほどコストが増大するため、防振性能を高くすることには限界がある。
In addition, by using an empty groove as a vibration blocking method, it is possible to reduce the vibration transmitted through the opposing groove wall surface to zero and to limit the propagation of vibration due to diffraction from the groove lower portion.
However, the wavelength of vibration becomes longer as the frequency is lower. In order to cope with this, the cost increases as the depth of the wall or the like is increased. Therefore, there is a limit to increasing the vibration isolation performance.
また、壁材と地盤のインピーダンス比を大きくするといっても、土の比重や剛性に対してコンクリートや鋼材のそれを大きくすることには限界があり、また比重が小さくて剛性の小さい発泡材のようなものを地中に設置する場合、地下水位が高いと発泡材が浮き上がるため安定した設置が困難という欠点がある。 Even if the impedance ratio between the wall material and the ground is increased, there is a limit to increasing that of concrete and steel against the specific gravity and rigidity of the soil. When such a thing is installed in the ground, if the groundwater level is high, there is a drawback that a stable installation is difficult because the foam material floats.
一般的に空溝を構築するには、２枚の山留壁を打設した後それらの間を掘削等して土を撤去するが、山留壁は土圧に抵抗して自立させる必要があるため、山留壁は空溝の深さよりさらに深く打設する必要があるためコストが増大する。 Generally, in order to construct an air groove, two pile walls are placed and then the soil is removed by excavating between them. However, it is necessary for the pile wall to be independent by resisting earth pressure. For this reason, it is necessary to drive the mountain retaining wall deeper than the depth of the air groove, which increases the cost.
そこで、通常の地下部の建設現場のように、２枚の山留壁の間に切梁を渡して壁を保持させる構造とした場合、切梁を介して振動が伝播してしまう。このため、上記した対向する溝壁面を透過する振動をゼロにした防振効果が減殺されてしまう欠点がある。
また、空溝の完成後に人や物が溝に転落する事故を防止するために蓋を設けると、同様に蓋が振動伝播経路となってしまう問題も有している。
Therefore, when the structure is such that a cut beam is passed between two mountain retaining walls and the wall is held like a normal underground construction site, vibration is propagated through the cut beam. For this reason, there exists a fault that the vibration proofing effect which made the vibration which permeate | transmits the above-mentioned groove wall surface facing zero was reduced.
In addition, when a lid is provided to prevent an accident in which a person or an object falls into the groove after the empty groove is completed, there is a problem that the lid similarly becomes a vibration propagation path.
本発明は、上述した種々の問題を解決するために創作されたもので、地球環境を保全しつつコストダウン可能かつ安全性と安定性があり、しかも高性能の防振地中壁を提供することを目的とするものである。 The present invention was created to solve the various problems described above, and provides a high-performance anti-vibration ground wall that can be reduced in cost, safe and stable while preserving the global environment. It is for the purpose.
請求項１に係る発明は、振動発生源から地盤を伝播してくる振動を遮断する防振地中壁において、地盤を掘削することにより形成された縦溝と、発泡樹脂等の軽量かつインピーダンスの小さい材料で覆われた袋の内部に土が充填された土嚢と、から構成され、前記縦溝は、多数の前記土嚢にて充填された防振地中壁とした。 The invention according to claim 1 is a vibration-proof ground wall that blocks vibration propagating through the ground from a vibration generating source, a vertical groove formed by excavating the ground, and a lightweight and impedance material such as foamed resin. The bag was covered with a small material, and the sandbag was filled with soil. The longitudinal groove was a middle wall of the anti-vibration ground filled with many sandbags.
請求項２に係る発明は、振動発生源から地盤を伝播してくる振動を遮断する防振地中壁において、鋼矢板、ソイルセメントまたはコンクリートからなる連続地中壁が間隔を置いて２重に打設され、その間に空間が形成された２重山留壁と、発泡樹脂等の軽量かつインピーダンスの小さい材料で覆われた袋の内部に土が充填された土嚢と、から構成され、２重山留壁の空間は、多数の前記土嚢にて充填された防振地中壁とした。 The invention according to claim 2 is the anti-vibration underground wall that blocks the vibration propagating from the vibration source to the ground wall, and the continuous underground wall made of steel sheet pile, soil cement or concrete is doubled at intervals. The double mountain retaining wall is composed of a double mountain retaining wall having a space formed therebetween, and a sandbag filled with soil in a bag covered with a lightweight and low impedance material such as foamed resin. The wall space was an anti-vibration ground wall filled with a large number of sandbags.
請求項３に係る発明は、前記軽量かつインピーダンスの小さい材料は、表面に切り込みが入れられた発泡樹脂製板であり、前記袋の表面に貼付されあるいは二重袋の間隙に収納されていることを特徴としている。 According to a third aspect of the present invention, the lightweight and low-impedance material is a foamed resin plate having a notch formed on the surface thereof, and is affixed to the surface of the bag or stored in a gap between the double bags. It is characterized by.
請求項４に係る発明は、前記軽量かつインピーダンスの小さい材料は、発泡樹脂製ビーズであり、二重袋の間隙に充填されていることを特徴としている。 The invention according to claim 4 is characterized in that the light-weight and low-impedance material is a foamed resin bead and is filled in a gap between double bags.
請求項５に係る発明は、発泡樹脂等の軽量かつインピーダンスの小さい材料が、二重袋の外袋と内袋の間に収納され、前記内袋に土を収納可能とされた防振地中壁用土嚢袋とした。 The invention according to claim 5 is an anti-vibration ground in which a lightweight and low-impedance material such as foamed resin is stored between the outer bag and the inner bag of the double bag, and soil can be stored in the inner bag. A wall sandbag was used.
請求項１に係る発明によれば、発泡樹脂等の軽量かつインピーダンスの小さい材料と地盤のインピーダンス比が高いほどその境界面での反射が増えて透過する振動が低減するので防振性能を高くすることができる。
特に地盤、連続地中壁、反復して出現する発泡樹脂等の層と土の層の境界面、連続地中壁、地盤の如きインピーダンスが異なる境界面を幾重にも設けることによって、各境界面を透過する振動がその都度低減して、防振地中壁部分を透過する振動が大きく低減する効果と、発泡樹脂材自体の減衰性能による効果の、２つを兼ね備えたものとなっているので防振性能を大きく高くすることができる。
According to the first aspect of the invention, the higher the impedance ratio between the light weight and low impedance material such as foamed resin and the ground, the more the reflection at the boundary surface increases and the transmitted vibration decreases, so the vibration isolation performance is increased. be able to.
In particular, each boundary surface is created by providing multiple boundary surfaces with different impedances, such as the ground, continuous underground wall, the boundary surface between the foamed resin layer and soil layer that repeatedly appear, the continuous underground wall, and the ground. The vibration that permeates through each time is reduced, the vibration that permeates through the inner wall of the anti-vibration ground is greatly reduced, and the effect of the damping performance of the foamed resin material itself is combined. The vibration isolation performance can be greatly increased.
また、地下水位が高い場合であっても、発泡樹脂等の軽量かつインピーダンスの小さい材料で覆われた袋の内部に土が充填されているので、土嚢が錘となって発泡樹脂等が浮き上がることがないため、発泡樹脂等を安定して所定の位置に保つことができる。
さらにまた、空溝の完成後に人や物が溝に転落する事故を防止するための蓋を設ける必要がないから、蓋が振動伝播経路となることを防止することができる。
In addition, even when the groundwater level is high, since the soil is filled inside the bag covered with a lightweight and low impedance material such as foamed resin, the foamed resin etc. will float with the sandbag serving as a weight. Therefore, the foamed resin or the like can be stably maintained at a predetermined position.
Furthermore, since it is not necessary to provide a lid for preventing an accident in which a person or an object falls into the groove after completion of the empty groove, the lid can be prevented from becoming a vibration propagation path.
土嚢を作るとき現地発生土を使用するため、現場外への排土量を低減することができ、また、この防振地中壁を仮設の振動対策構造物として使用した場合、袋を重機で取り出して内部の土を用いて埋め戻すことにより、廃棄物を最小限とすることができ、地球環境保全に貢献し得る。 Since soil generated from the site is used when making sandbags, the amount of soil discharged outside the site can be reduced, and when this anti-vibration ground wall is used as a temporary vibration countermeasure structure, By taking it out and backfilling it with the soil inside, it is possible to minimize waste and contribute to the conservation of the global environment.
請求項２に係る発明によれば、土嚢を充填する空間を鋼矢板、ソイルセメントまたはコンクリートからなる連続地中壁を間隔を置いて２重に打設した２重山留壁にて形成したので、工事中に土壁が崩壊することなく防振地中壁構築工事を安定して施工することができる。 According to the invention according to claim 2, because the space for filling the sandbag is formed by the double mountain retaining wall that is formed by doubling the continuous underground wall made of steel sheet pile, soil cement or concrete, The construction of the anti-vibration ground wall can be performed stably without the earth wall collapsing during the construction.
さらに、空溝の山留壁は土圧に抵抗して自立させるため、山留壁は空溝の深さよりさらに深く打設する必要があるが、この発明によれば、袋部分は土で充填されているために、山留壁の土圧の一部を袋詰めされた土に負担させて打設深さを浅くして施工コストを削減することができ、その強度・剛性を高くすることができる。 Furthermore, since the retaining wall of the ditch is self-supporting against earth pressure, it is necessary to drive the retaining wall deeper than the depth of the ditch. According to the present invention, the bag portion is filled with soil. Therefore, it is possible to reduce the construction cost by placing a part of the earth pressure of the mountain retaining wall on the bagged soil to reduce the placement depth, and to increase its strength and rigidity. Can do.
請求項３に係る発明によれば、発泡樹脂製板の表面に切り込みが入れられているので、想定外の発泡樹脂板の破断を防ぎ、また袋表面に貼付されあるいは二重袋の間隙に収納されているので、発泡樹脂板の散逸を防ぐことができる。 According to the invention of claim 3, since the notch is made on the surface of the foamed resin plate, it is possible to prevent an unexpected breakage of the foamed resin plate, and it is affixed to the bag surface or stored in the gap between the double bags. As a result, dissipation of the foamed resin plate can be prevented.
請求項４に係る発明によれば、土嚢の構造が、発泡樹脂製ビーズが二重袋の間隙に充填されたものであるので、製作が容易であるばかりでなく土圧に対して柔軟に抵抗することができる。 According to the invention of claim 4, since the structure of the sandbag is such that the foamed resin beads are filled in the gap between the double bags, not only the manufacture is easy, but also resistance to earth pressure is flexible. can do.
請求項５に係る発明によれば、二重袋の外袋と内袋の間には、発泡樹脂等の軽量かつインピーダンスの小さい材料が既に収納されているので、防振地中壁構築現場では、通常の土嚢を作成するときと同じようにこの防振地中壁用土嚢袋に土を充填するのみでよく、作業性を良くすることができる。 According to the invention according to claim 5, between the outer bag and the inner bag of the double bag, a lightweight and low impedance material such as foamed resin is already stored. In the same way as when creating a normal sandbag, it is only necessary to fill the sandbag for the middle wall of the vibration-proofing ground, and workability can be improved.
本実施例の防振地中壁１の一部を示す横断面図である図１を参照して、本実施例を説明する。
建設工事現場、工場、鉄道、道路等の振動発生源から地盤１１を伝播してくる振動を遮断する防振地中壁１は、鋼矢板、ソイルセメントまたはコンクリートからなる連続地中壁２１．２１が間隔を置いて２重に打設され、その間の地盤を掘削して空間が形成された２重山留壁２と、外面が発泡樹脂で覆われた土嚢３とから構成されている。
The present embodiment will be described with reference to FIG. 1 which is a cross-sectional view showing a part of the middle wall 1 of the vibration-proof ground of the present embodiment.
An anti-vibration ground wall 1 that blocks vibration propagating from the ground 11 from vibration sources such as construction sites, factories, railways, and roads is a continuous underground wall 21.21 made of steel sheet pile, soil cement, or concrete. Is double-punched at intervals, and is composed of a double mountain retaining wall 2 in which a space is formed by excavating the ground therebetween, and a sandbag 3 whose outer surface is covered with foamed resin.
土嚢３は内土嚢袋３１と外土嚢袋３２からなる二重袋とされ、この二重袋の間に外表面に切り込み３５が入れられ、裏面に裏あて材３４が貼付された発泡樹脂製板３３が収納されている。
この切り込み３５は、発泡スチロール板３３の破断を防止するものであり、裏あて材３４は、発泡スチロール板３３が破断したときでもそれらの移動を防いで発泡スチロール板３３を全体として保形するものである。
The sandbag 3 is a double bag composed of an inner sandbag 31 and an outer sandbag 32, a notch 35 is formed on the outer surface between the double bags, and a foamed resin plate having a backing material 34 attached to the back surface. 33 is stored.
This notch 35 prevents the foamed polystyrene plate 33 from breaking, and the backing material 34 prevents the movement of the foamed polystyrene plate 33 even when the foamed polystyrene plate 33 breaks, and holds the foamed polystyrene plate 33 as a whole.
土嚢３は、上記した二重袋の内土嚢袋３１内部に土３６が充填されたものが多数製作される。防振地中壁１は、２重に打設された連続地中壁２１．２１間に形成された２重山留壁空間２２にこれら土嚢３が設置された構造となっている。 A large number of sandbags 3 in which the inner sandbag 31 of the double bag is filled with the soil 36 are manufactured. The anti-vibration ground wall 1 has a structure in which these sandbags 3 are installed in a double mountain retaining wall space 22 formed between continuous ground walls 21.21 that are double-punched.
二重袋の構造は、土嚢３内の充填土３６が外に漏れることのない布製もしくは樹脂製の袋の表面に、可撓性のあるクッション材を貼り付けた構造や袋の素材自体にクッション性を有する構造、あるいは小さな発泡樹脂ブロックが独立して鎧状に袋に張り付いている構造とする。また、クッションの材料は、発泡樹脂以外に、繊維を綿状にしたものでもよい。 The double bag structure has a structure in which a flexible cushioning material is pasted on the surface of a cloth or resin bag where the filling soil 36 in the sandbag 3 does not leak to the outside, or the bag material itself is cushioned. Or a structure in which small foamed resin blocks are independently attached to the bag in an armor shape. Moreover, the material of the cushion may be a cotton-like fiber other than the foamed resin.
以上の実施の態様では、鋼矢板、ソイルセメントまたはコンクリートからなる連続地中壁を間隔を置いて２重に打設して２重山留壁２を構築しているが、この２重山留壁２は必ずしも必須のものではなく、地盤の安定性等の条件によってはこれを削減することも可能である。 In the embodiment described above, the double pile retaining wall 2 is constructed by double-placing continuous underground walls made of steel sheet piles, soil cement, or concrete at intervals. Is not necessarily essential, and it can be reduced depending on conditions such as the stability of the ground.
この実施例は、土嚢３は内土嚢袋３１と外土嚢袋３２からなる二重袋とされ、この二重袋の間に発泡樹脂製ビーズが充填された形態である。
二重袋の構造は、実施例１と同様の構造とすることもできる。
In this embodiment, the sandbag 3 is a double bag composed of an inner sandbag bag 31 and an outer sandbag bag 32, and foamed resin beads are filled between the double bags.
The double bag structure may be the same as that of the first embodiment.
１ 防振地中壁
２ ２重山留壁
２１ 連続地中壁
２２ ２重山留壁空間
３ 土嚢
３１ 内土嚢袋
３２ 外土嚢袋
３３ 発泡スチロール板
３４ 裏あて材
３５ 切り込み
３６ 充填土
３７ 緊締部
DESCRIPTION OF SYMBOLS 1 Anti-vibration ground wall 2 Double mountain retaining wall 21 Continuous underground wall 22 Double mountain retaining wall space 3 Sandbag 31 Inner sandbag 32 Outer sandbag 33 Styrofoam board 34 Backing material 35 Cut 36 Filling soil 37 Fastening part
Claims (5)
地盤を掘削することにより形成された縦溝と、
発泡樹脂等の軽量かつインピーダンスの小さい材料で覆われた袋の内部に土が充填された土嚢と、から構成され、
前記縦溝は、多数の前記土嚢にて充填されていることを特徴とする防振地中壁。 In the anti-vibration underground wall that blocks the vibration propagating from the vibration source to the ground,
Vertical grooves formed by excavating the ground,
A sandbag filled with soil inside a bag covered with a lightweight and low impedance material such as foamed resin, and
The anti-vibration ground wall, wherein the longitudinal grooves are filled with a large number of sandbags.
鋼矢板、ソイルセメントまたはコンクリートからなる連続地中壁が間隔を置いて２重に打設され、その間に空間が形成された２重山留壁と、
発泡樹脂等の軽量かつインピーダンスの小さい材料で覆われた袋の内部に土が充填された土嚢と、から構成され、
２重山留壁の空間は、多数の前記土嚢にて充填されていることを特徴とする防振地中壁。 In the anti-vibration underground wall that blocks the vibration propagating from the vibration source to the ground,
A double pile retaining wall in which a continuous underground wall made of steel sheet pile, soil cement or concrete is placed twice at an interval, and a space is formed between them,
A sandbag filled with soil inside a bag covered with a lightweight and low impedance material such as foamed resin, and
An anti-vibration ground wall, wherein the double mountain retaining wall is filled with a large number of sandbags.
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