JP2013002049A - Tide wall construction method - Google Patents

Tide wall construction method Download PDF

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JP2013002049A
JP2013002049A JP2011131259A JP2011131259A JP2013002049A JP 2013002049 A JP2013002049 A JP 2013002049A JP 2011131259 A JP2011131259 A JP 2011131259A JP 2011131259 A JP2011131259 A JP 2011131259A JP 2013002049 A JP2013002049 A JP 2013002049A
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scouring prevention
water
seawall
ground
scouring
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JP5674560B2 (en
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Takeshi Iketani
毅 池谷
Satoshi Nagashima
聡志 永嶋
Yoshinobu Akiyama
義信 秋山
Shinichiro Uematsu
慎一郎 植松
Hiromitsu Kida
博光 木田
Masaru Fukuda
優 福田
Takeshi Nishikawa
武志 西川
Shigeru Shoji
茂 庄子
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Kajima Corp
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Kajima Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a tide wall construction method, which enables a short-period construction even when a ground is uneven, and can prevent scouring.SOLUTION: Scouring-prevention bodies 1 are piled up on a ground 9 which faces the sea 13. The scouring-prevention body 1 is a component consisting of a holding body 3 packed with a fill material 5 with a mouth at the top being closed. The inside of the holding body 3 is filled with the fill material 5, which can be, for example, crashed stones, preferably with large specific gravity. Part of the piled scouring-prevention bodies is pasted with unwoven fabric 15. The unwoven fabric 15 is pasted at least on the entire surface area of the part facing the sea 13. The entire area of the surface side of the unwoven fabric is sprayed with an impervious material 21 by a spray device 19. The impervious material 21 preferably has a designated strength after hardening, while having elasticity at the same time.

Description

本発明は、津波や高波等が発生した際に、海岸や河川からの水害を防止するための防潮堤の施工方法に関するものである。   The present invention relates to a construction method of a tide embankment for preventing water damage from a coast or a river when a tsunami or a high wave occurs.

地震による津波や、台風などによる高波等による被害を防止するため、海岸沿いや河川脇には、防潮堤が設けられる場合がある。防潮堤は、海岸沿いなどの所定の範囲に対して、所定の高さで形成される。   In order to prevent damage from tsunamis caused by earthquakes and high waves from typhoons, etc., there are cases where seawalls are provided along the coast or alongside rivers. The seawall is formed at a predetermined height with respect to a predetermined range such as along the coast.

このような、防潮堤の施工方法としては、例えば、堤防上にプレキャスト擁壁を配置して形成する方法がある(例えば特許文献1)。   As a construction method of such a seawall, there is, for example, a method of forming a precast retaining wall on the bank (for example, Patent Document 1).

特開2008−190200号公報JP 2008-190200 A

図10(a)は、従来の防潮堤100を示す概略図である。防潮堤100は、例えば海113に面した地盤109上に設けられる。防潮堤100はコンクリート製であり、地盤109に対して所定の高さに形成される。防潮堤100によれば、防潮堤100の高さよりも低い水位の津波や高波が生じても、防潮堤100によって後方の領域への水の流入を抑えることができる。   FIG. 10A is a schematic diagram showing a conventional seawall 100. The seawall 100 is provided on the ground 109 facing the sea 113, for example. The seawall 100 is made of concrete and is formed at a predetermined height with respect to the ground 109. According to the seawall 100, even if a tsunami or a high wave with a water level lower than the height of the seawall 100 is generated, the seawall 100 can suppress the inflow of water to the rear area.

これに対し、このような防潮堤100に対して、例えば津波等が押し寄せて、図10(b)に示すように防潮堤100の高さよりも高い水位となった場合には、海113からの水が、防潮堤100を超えて防潮堤100の後方領域へ流入する(図中矢印D方向)。   On the other hand, for example, when a tsunami or the like rushes against such a tide embankment 100 and becomes a water level higher than the height of the tide embankment 100 as shown in FIG. Water flows over the seawall 100 to the rear area of the seawall 100 (in the direction of arrow D in the figure).

このような場合には、防潮堤100の後方に一気に水が流れ込むため、この近傍の地盤109が洗掘される恐れがある。このため、洗掘された部位に水やがれきが溜まるため、その後の復旧にも時間を要する。   In such a case, since water flows into the back of the seawall 100 at a stretch, there is a risk that the ground 109 in the vicinity will be scoured. For this reason, since water and debris accumulate in the scoured site, it takes time for the subsequent recovery.

また、このようなコンクリート製の防潮堤100を施工するためには、ある程度の工期を要する。特に、地盤109が不陸である場合などは、地盤整備から行う必要があるため、防潮堤100の施工に時間を要する。   Moreover, in order to construct such a concrete tide embankment 100, a certain period of work is required. In particular, when the ground 109 is uneven, it is necessary to perform the construction of the seawall 100 because it is necessary to perform ground maintenance.

これに対し、例えば、大きな地震後の余震により発生する津波や、台風による高波による被害を防止するためには、極めて短期間で防潮堤を構築する必要がある。   On the other hand, for example, in order to prevent damage caused by tsunamis caused by aftershocks after a large earthquake or high waves caused by typhoons, it is necessary to construct a seawall in a very short period of time.

本発明は、このような問題に鑑みてなされたもので、短期間で施工することができ、洗掘を防止することが可能な防潮堤の施工方法を提供することを目的とする。   This invention is made | formed in view of such a problem, and it aims at providing the construction method of the seawall which can be constructed in a short period of time and can prevent scouring.

前述した目的を達成するため、本発明は、防潮堤の施工方法であって、水を透過可能な保持体と、前記保持体の内部に充填される中詰材とを有する洗掘防止体を複数用い、前記洗堀防止体を、海岸または河川近傍の地盤上に積み上げ、積み上げられた前記洗堀防止体の少なくとも海岸または河川方向に面する部位を遮水部材で被覆することを特徴とする防潮堤の施工方法である。   In order to achieve the above-mentioned object, the present invention is a method of constructing a seawall, and includes a scouring prevention body having a holder that is permeable to water and a filling material that is filled inside the holder. A plurality of the scouring prevention bodies are stacked on a ground near a coast or a river, and at least a portion facing the coast or river direction of the piled scouring prevention body is covered with a water shielding member. This is the construction method of the seawall.

積み上げられた前記洗堀防止体の少なくとも海岸または河川方向とは反対側に面する部位には前記遮水部材が設けられず、前記洗掘防止体が露出することが望ましい。   It is desirable that the water blocking member is not provided at least on the portion facing the coast or river direction of the scouring prevention body that is stacked, and the scouring prevention body is exposed.

前記保持体は編み込まれた袋体であり、前記洗堀防止体を地盤上に載置すると、偏平形状に変形可能であり、地盤上に載置された前記洗掘防止体の幅に対する高さが1/3以下であり、少なくとも最上部に位置する前記洗堀防止体同士が連結されることが望ましい。   The holding body is a woven bag body, and when the scouring prevention body is placed on the ground, it can be deformed into a flat shape, and the height relative to the width of the scouring prevention body placed on the ground Is 1/3 or less, and it is desirable that the scouring prevention bodies positioned at least at the uppermost part are connected to each other.

前記遮水部材は、積み上げられた前記洗堀防止体の少なくとも海岸または河川方向に面する部位に不織布を設け、前記不織布の表面に、固化後に伸縮が可能な遮水材を吹き付けることで形成してもよい。前記不織布は、編み込まれた袋体である保持体の編み部にピンで固定されることが望ましい。   The water-impervious member is formed by providing a nonwoven fabric at least on a site facing the coast or river direction of the scouring prevention body stacked, and spraying a water-impervious material that can expand and contract after solidification on the surface of the nonwoven fabric. May be. The nonwoven fabric is preferably fixed to the knitting portion of the holding body, which is a woven bag body, with a pin.

少なくとも一部の保持体の内部には、あらかじめ不織布が配置され、前記中詰材は、前記不織布の内部に充填され、前記不織布が内部に配置された前記洗掘防止体を、少なくとも海岸または河川方向に面する部位に積み上げ、前記遮水部材は、少なくとも海岸または河川方向に面する前記不織布の表面に、固化後に伸縮が可能な遮水材を吹き付けることで形成されてもよい。   At least a part of the holding body is preliminarily provided with a non-woven fabric, the filling material is filled in the non-woven fabric, and the scouring prevention body in which the non-woven fabric is arranged is at least a coast or a river. The water shielding member may be formed by spraying a water shielding material that can expand and contract after solidification on at least the surface of the nonwoven fabric facing the coast or river direction.

前記不織布は遮水シートであり、積み上げられた前記洗堀防止体の少なくとも海岸または河川方向に面する部位に前記遮水シートが貼り付けられてもよい。   The non-woven fabric is a water-impervious sheet, and the water-impervious sheet may be affixed to at least a portion of the stacked scouring prevention body facing the coast or river.

前記地盤上に前記洗堀防止体を配置する前に、前記地盤から海岸または河川方向に向かって形成される斜面に前記洗堀防止体を配置し、前記地盤よりも上部の前記洗堀防止体と、前記地盤よりも下部の前記洗堀防止体との間に、あらかじめ遮水マットを配置してもよい。   Before disposing the scouring prevention body on the ground, the scouring prevention body is disposed on a slope formed from the ground toward the coast or a river, and the scouring prevention body above the ground. And a water-impervious mat may be arranged in advance between the scouring prevention body below the ground.

本発明によれば、保持体内部に中詰材が充填される洗掘防止体を積み上げるため、防潮堤の施工が容易であり、あらかじめ工場で洗掘防止体を製造すれば、現場での設置・積み上げ作業を無人で行うこともでき、極めて短期間で防潮堤を構築することができる。   According to the present invention, since the scouring prevention bodies filled with the filling material are piled up inside the holding body, the construction of the tide bank is easy, and if the scouring prevention body is manufactured in the factory in advance, it can be installed at the site. -Stacking work can be done unattended, and a seawall can be constructed in an extremely short period of time.

また、海岸等に面した側には、遮水部材が設けられるため、水位が上昇しても、防潮堤を透過して水が後方に流入することがない。   Moreover, since a water-impervious member is provided on the side facing the coast or the like, even if the water level rises, water does not flow backward through the seawall.

また、防潮堤の海岸とは反対側の面には、遮水部材が設けられずに、洗掘防止体を露出させることで、万が一防潮堤を水が超えた場合にも、水が洗掘防止体内部を透過して後方に流れ出るため、防潮堤の頂部から一気に水が後方地盤に落下して、地盤が洗掘されることがない。   Also, on the opposite side of the shore of the seawall, there is no water-impervious member, and the scouring prevention body is exposed, so that even if the water exceeds the seawall, the water will be scoured. Since it passes through the inside of the prevention body and flows backward, water does not fall to the rear ground from the top of the seawall, and the ground is not scoured.

また、保持体が編み込まれた袋体であれば、容易に変形することができる。このため、洗掘防止体を地盤に載置した場合や積み上げた場合に、洗掘防止体が設置部の形状に容易に追従して設置することができる。このため、不陸な地盤に対しても、容易に洗掘防止体を積み上げることができる。   Moreover, if it is a bag body in which the holding body is knitted, it can be easily deformed. For this reason, when the scouring prevention body is placed on the ground or stacked, the scouring prevention body can be installed following the shape of the installation part easily. For this reason, a scouring prevention body can be easily piled up also on uneven ground.

また、洗掘防止体を地盤に設置した際に、幅(例えば、平面視において最も狭い幅)に対する高さが1/3以下であれば、強力な水流による力が付与されても、安定性を確保することができ、容易に転がって移動することがない。例えば、通常の土のうのような形状では、積み上げられた状態であっても、力が付与されると容易に転がってしまうが、偏平率が大きく、接地面積に対する高さを低くすることで、より安定した防潮堤を構築することができる。   In addition, when the scouring prevention body is installed on the ground, if the height with respect to the width (for example, the narrowest width in a plan view) is 1/3 or less, the stability can be obtained even if a force from a strong water flow is applied. Can be secured, and does not easily roll and move. For example, in a normal shape like a sandbag, even if it is in a stacked state, it will roll easily when force is applied, but the flatness is large, and by reducing the height with respect to the ground contact area, A stable seawall can be constructed.

また、少なくとも最上部に位置する洗掘防止体同士が連結されることで、より確実に、防潮堤の崩れを防止することができる。   Moreover, the scouring prevention bodies positioned at least at the uppermost part are connected to each other, so that the breakage of the seawall can be more reliably prevented.

また、海岸等に面した部位に不織布を設けて、固化後に伸縮性を有する遮水材を吹き付けることで、容易に防潮堤の遮水性を確保できるとともに、遮水材が伸縮性を有するため、洗掘防止体の揺れや多少の移動等が生じても、遮水材がこれに追従して、遮水性を維持することができる。また、遮水材は吹き付けであれば、作業が迅速であり、短期間で遮水部材を形成することができる。   In addition, by providing a non-woven fabric at the site facing the coast, etc., and spraying a water barrier material having elasticity after solidification, it is possible to easily secure the water barrier of the seawall, and the water barrier material has elasticity. Even if the scouring prevention body is shaken or slightly moved, the water shielding material can follow the water proofing and maintain the water shielding property. Moreover, if the water shielding material is sprayed, the operation is quick and the water shielding member can be formed in a short period of time.

なお、不織布を貼り付ける際には、編み込まれた袋体の編み部にピンで固定することで、不織布が剥がれることがない。したがって、確実に遮水性を維持することができる。   In addition, when sticking a nonwoven fabric, a nonwoven fabric does not peel by fixing to the knitting part of the knitted bag body with a pin. Therefore, it is possible to reliably maintain the water shielding property.

また、少なくとも一部の保持体の内部にあらかじめ不織布を入れておき、不織布の内部に中詰材を充填することで、不織布を貼り付ける作業を削減することができる。この場合には、海岸等に面した部位にのみ不織布入りの洗掘防止体を設置すれば、他の部位に設置する洗掘防止体は、不織布を有さないものであってもよい。   Moreover, the operation | work which sticks a nonwoven fabric can be reduced by putting a nonwoven fabric beforehand in the inside of at least one part holding body, and filling a filling material in the inside of a nonwoven fabric. In this case, if the anti-scouring body containing a non-woven fabric is installed only at the site facing the coast or the like, the anti-scouring material installed at another site may not have the non-woven fabric.

また、不織布への遮水材の吹き付けではなく、海岸等に面した側に、遮水シートを張り付けても、防潮堤の遮水性を確保することができる。   Moreover, even if the water shielding sheet is attached to the side facing the coast or the like instead of spraying the water shielding material to the nonwoven fabric, the water impermeability of the seawall can be secured.

また、地盤から海岸等に向かって形成される斜面に洗掘防止体を配置することで、防潮堤を構築するだけの広さが確保できない場所であっても、海岸等の方向に洗掘防止体を積み上げることで、防潮堤の設置場所を確保することができる。   In addition, by arranging a scouring prevention body on the slope formed from the ground toward the coast, etc., even in places where it is not possible to secure a space enough to build a seawall, it prevents scouring in the direction of the coast, etc. By stacking the body, it is possible to secure a place to install the seawall.

この場合、地盤よりも上に積み上げられる洗掘防止体と下方に積み上げられた洗掘防止体との間に遮水マットを配置することで、海岸等からの水が下方から防潮堤の内部に流入することを防止することができる。   In this case, water from the shore etc. will enter the inside of the tide embankment from below by placing a water-impervious mat between the scouring prevention body stacked above the ground and the scouring prevention body stacked below. Inflow can be prevented.

本発明によれば、例えば地盤が不陸である場合であっても短期間で施工することができ、洗掘を防止することが可能な防潮堤の施工方法を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the ground is uneven, for example, it can be constructed in a short period of time, and a construction method for a seawall that can prevent scouring can be provided.

洗掘防止体1を示す図で、(a)は吊りあげられた状態を示す図、(b)は地盤9に載置された状態を示す図。It is a figure which shows the scouring prevention body 1, (a) is a figure which shows the state lifted, (b) is a figure which shows the state mounted in the ground 9. FIG. 海岸に洗掘防止体1を積み上げた状態を示す図。The figure which shows the state which piled up the scouring prevention body 1 on the shore. 海岸に面した側に不織布15を配置した状態を示す図で、(a)は立面図、(b)は(a)のA部拡大断面図。It is a figure which shows the state which has arrange | positioned the nonwoven fabric 15 on the side which faces the coast, (a) is an elevation view, (b) is the A section expanded sectional view of (a). 不織布15に遮水材21を吹き付ける工程を示す図で、(a)は立面図、(b)は(a)のA部拡大断面図。It is a figure which shows the process of spraying the water-impervious material 21 to the nonwoven fabric 15, (a) is an elevation view, (b) is the A section expanded sectional view of (a). 他の実施形態を示す図で、遮水部材25aを構築する工程を示す図。The figure which shows other embodiment and the figure which shows the process of constructing the water-impervious member 25a. 防潮堤10に対して、潮位が上昇した状態を示す図。The figure which shows the state which the tide level rose with respect to the seawall. 他の実施形態を示す図で、海岸方向の斜面に洗掘防止体を積み上げた状態を示す図。The figure which shows other embodiment, and is a figure which shows the state which piled up the scouring prevention body on the slope of a coast direction. 防潮堤30を構築する工程を示す図。The figure which shows the process of constructing the seawall 30. 洗掘防止体1の積み方の他の実施例を示す図。The figure which shows the other Example of how to pile up the scouring prevention body 1. FIG. 従来の防潮堤100を示す図。The figure which shows the conventional seawall 100.

以下、本発明の実施の形態にかかる防潮堤の施工方法について説明する。図1は、防潮堤に用いられる洗掘防止体1を示す図であり、図1(a)は吊りあげられた状態を示す図、図1(b)は地盤9に載置された状態を示す図である。なお、地盤9は、自然の砂、土、岩等により形成されるものであっても、あらかじめ舗装されたものであってもよい。   Hereinafter, a construction method of a seawall according to an embodiment of the present invention will be described. FIG. 1 is a view showing a scouring prevention body 1 used for a seawall, FIG. 1 (a) is a view showing a suspended state, and FIG. 1 (b) is a view showing a state where it is placed on the ground 9. FIG. The ground 9 may be formed of natural sand, soil, rock, or the like, or may be paved in advance.

洗掘防止体1は、保持体3の内部に中詰材5が充填されたものであり、上部が口閉じされた部材である。保持体3は、例えば、ナイロンや再生PET材等の高強度の合成繊維で編み込まれた袋体である。すなわち、保持体3は容易に水を透過する部材である。なお、保持体3を構成する樹脂には、必要に応じて、耐候性を高めるために、所定量のカーボンブラックを含有させてもよい。   The scouring prevention body 1 is a member in which the inside of the holding body 3 is filled with the filling material 5 and the upper part is closed. The holding body 3 is a bag body knitted with high-strength synthetic fibers such as nylon or recycled PET material, for example. That is, the holding body 3 is a member that easily transmits water. In addition, you may make the resin which comprises the support body 3 contain a predetermined amount of carbon black as needed, in order to improve a weather resistance.

保持体3の内部には、中詰材5が充填されている。中詰材5は、例えば砕石であり、比重の大きな材質のものが望ましい。なお、砕石に代えて、鉄くずやコンクリートがら等を用いても良いが、コンクリートがら等は自然石と比較して比重が小さいため、自然石等を混ぜて用いることが望ましい。   The inside of the holding body 3 is filled with the filling material 5. The filling material 5 is, for example, crushed stone and is preferably made of a material having a large specific gravity. In addition, instead of crushed stone, iron scrap or concrete waste may be used. However, since concrete waste has a smaller specific gravity than natural stone, it is desirable to use natural stone mixed.

洗掘防止体1の上部には、吊りリング7が設けられ、吊りリング7で保持体3の口が閉じられる。したがって、図1(a)に示すように、洗掘防止体1は、吊りリング7にフック等を掛けて、容易に運搬・移動を行うことができる。   A suspension ring 7 is provided on the upper portion of the scouring prevention body 1, and the mouth of the holding body 3 is closed by the suspension ring 7. Therefore, as shown in FIG. 1A, the scouring prevention body 1 can be easily transported and moved by hooking the suspension ring 7 with a hook or the like.

また、図1(b)に示すように、洗掘防止体1は、地盤9上に載置されると、自重によって変形(偏平)する。このように地盤9上で偏平した状態における幅(図中Wであって、平面視で最も狭い部分)に対する高さ(図中H)が1/3以下となることが望ましい。このように大きく偏平させることで、地盤9と洗掘防止体1との接触面積を大きくとることができるとともに、水流等によって側方から力を受けた際に、洗掘防止体1が転がったり移動したりせず、安定して配置することができる。   Moreover, as shown in FIG.1 (b), when the scouring prevention body 1 is mounted on the ground 9, it will deform | transform (flatten) with dead weight. Thus, it is desirable that the height (H in the figure) with respect to the width (W in the figure and the narrowest part in plan view) in the flat state on the ground 9 be 1/3 or less. By flattening in this way, the contact area between the ground 9 and the scouring prevention body 1 can be increased, and the scouring prevention body 1 may roll when receiving a force from the side by a water flow or the like. It can be placed stably without moving.

また、洗掘防止体1が容易に変形可能であることで、載置する地盤9表面が平らではない場合であっても、地盤の凹凸に追従して変形するため、洗掘防止体1を確実に安定して配置することができる。   In addition, since the scouring prevention body 1 can be easily deformed, even if the surface of the ground 9 to be placed is not flat, the scouring prevention body 1 is deformed following the unevenness of the ground. It can be reliably and stably arranged.

なお、このような洗掘防止体1としては、例えば、特開2003−129444号公報に記載のように、袋材部に連結され、袋材の開口を閉じた口部から外に引き出され、底部と口部とを連結する中繋ぎ材が設けられた耐波浪性土木工事用袋材を用いてもよい。   In addition, as such a scouring prevention body 1, for example, as described in JP-A-2003-129444, it is connected to a bag material part, and is drawn out from a mouth part where the opening of the bag material is closed, You may use the wave-resistant civil engineering bag material provided with the middle connecting material which connects a bottom part and a mouth part.

なお、本発明で用いられる洗掘防止体1としては、例えば4〜8t程度の重量のものが用いられる。また、地盤9が平らであり、安定性が確保できれば、保持体3は必ずしも変形が可能な袋体ではなく、形状が定まった籠状部材を用いてもよい。   In addition, as the scouring prevention body 1 used by this invention, the thing of the weight of about 4-8 t is used, for example. If the ground 9 is flat and stability can be secured, the holding body 3 is not necessarily a deformable bag body, and a hook-shaped member having a fixed shape may be used.

次に、本発明の防潮堤の施工方法について説明する。図2は、海岸沿いに防潮堤を施工する状態を示す図である。なお、本発明は、海13に面した海岸以外にも、河川に面した部位に適用することもできる。また、図では、海13のすぐ近くに防潮堤を形成する例を示すが、海13から防潮堤を施工する部位まで、多少の距離があってもよい。   Next, the construction method of the seawall of this invention is demonstrated. FIG. 2 is a diagram showing a state in which a seawall is constructed along the coast. In addition, this invention can also be applied to the part which faced the river besides the coast which faced the sea 13. FIG. Moreover, although the figure shows the example which forms a seawall in the immediate vicinity of the sea 13, there may be some distance from the sea 13 to the site | part which constructs a seawall.

まず、図2に示すように、海13に面した地盤9上に洗掘防止体1を積み上げる。洗掘防止体1の積み上げる段数は、施工する防潮堤の高さに応じて設定される。また、防潮堤を安定させるため、洗掘防止体1は、施工される防潮堤の長手方向から見て、略台形となるように積み上げられる。   First, as shown in FIG. 2, the scouring prevention body 1 is stacked on the ground 9 facing the sea 13. The number of steps of the scouring prevention body 1 to be stacked is set according to the height of the seawall to be constructed. Moreover, in order to stabilize a tide bank, the scouring prevention body 1 is piled up so that it may become a substantially trapezoid seeing from the longitudinal direction of the tide bank to be constructed.

ここで、少なくとも最上部に位置する隣り合う洗掘防止体1(海側から陸側に向かって隣り合う洗掘防止体)の吊りリング7同士は連結部材11により連結される。なお、図示は省略するが、防潮堤の長手方向に隣接する洗掘防止体1同士も同様に連結されることが望ましい。また、最上段のみではなく、その下段の隣り合う洗掘防止体同士(または段をまたいで上下に隣接する洗掘防止体同士)も連結してもよい。   Here, the suspension rings 7 of the adjacent scouring prevention bodies 1 (adjacent scouring prevention bodies from the sea side to the land side) located at least at the uppermost part are connected by a connecting member 11. In addition, although illustration is abbreviate | omitted, it is desirable to connect similarly the scouring prevention bodies 1 adjacent to the longitudinal direction of a seawall. Further, not only the uppermost stage but also the adjacent scouring prevention bodies in the lower stage (or scouring prevention bodies adjacent in the vertical direction across the steps) may be connected.

次に、図3(a)に示すように、積み上げられた洗掘防止体1の一部に不織布15を貼り付ける。不織布15は、少なくとも、海13の方向に面した部位(図中右側の斜面)の全面に貼り付けられる。なお、不織布15を貼り付ける際には、当該貼り付け部位に事前にプライマー(ボンド)を塗布し、積み上げられた洗掘防止体1の形状に沿って、所定の大きさに切断された不織布15を貼り付ける。   Next, as shown to Fig.3 (a), the nonwoven fabric 15 is affixed on a part of the scouring prevention body 1 piled up. The nonwoven fabric 15 is affixed on at least the entire surface of the portion facing the direction of the sea 13 (the slope on the right side in the figure). In addition, when affixing the nonwoven fabric 15, a primer (bond) is applied in advance to the affixing site, and the nonwoven fabric 15 cut into a predetermined size along the shape of the scouring prevention body 1 stacked. Paste.

図3(b)は、図3(a)のA部拡大図である。不織布15を貼り付け後、図3(b)に示すように、不織布15が剥がれないように、不織布15をピン17で保持体3に固定する。例えば、不織布15の表面側からピン17の先端を突き刺して、保持体3の編み部にピン17を引掛ければよい。不織布15の所定か所をピン17で固定することで、不織布15を確実に洗掘防止体1に固定することができる。   FIG.3 (b) is the A section enlarged view of Fig.3 (a). After affixing the nonwoven fabric 15, as shown in FIG. 3B, the nonwoven fabric 15 is fixed to the holding body 3 with pins 17 so that the nonwoven fabric 15 does not peel off. For example, the tip of the pin 17 may be pierced from the surface side of the nonwoven fabric 15 and the pin 17 may be hooked on the knitted portion of the holding body 3. By fixing the predetermined place of the nonwoven fabric 15 with the pin 17, the nonwoven fabric 15 can be reliably fixed to the scouring prevention body 1. FIG.

次に、図4(a)に示すように、吹き付け装置19によって、不織布15の表面全面に遮水材21を吹き付ける。遮水材21は、例えばウレタン樹脂等であり、2液型のウレタン樹脂をスプレー状にして、吹き付け装置19で吹きつければよい。吹き付けられた遮水材21は、不織布15の表面で固化する。ここで、遮水材21としては固化後に、所定の強度を有するとともに、伸縮性を有することが望ましい。このような材料としては、例えば、ダイフレックス社製の「レジテクト」(登録商標)(例えば、伸びが230%以上で、引張強さは7.35N/mm以上)を用いることができる。 Next, as shown in FIG. 4A, the water shielding material 21 is sprayed on the entire surface of the nonwoven fabric 15 by the spraying device 19. The water shielding material 21 is, for example, a urethane resin, and a two-component urethane resin may be sprayed and sprayed by the spraying device 19. The sprayed water shielding material 21 is solidified on the surface of the nonwoven fabric 15. Here, it is desirable that the water shielding material 21 has a predetermined strength after being solidified and has elasticity. As such a material, for example, “Resect” (registered trademark) manufactured by Daiflex Co., Ltd. (for example, elongation is 230% or more and tensile strength is 7.35 N / mm 2 or more) can be used.

図4(b)は、図4(a)のA部拡大図であり、遮水材21が吹き付けられた状態の断面拡大図である。不織布15の固定に金属製のピン17を用いた場合には、遮水材21を吹き付ける間に、ピン17を表面から被覆する絶縁材23を設けることが望ましい。ピン17上に絶縁材23を設けることで、遮水材21を吹き付けた後に、ピン17が遮水材21表面に突き抜けて外部に露出することがなく、ピン17の腐食等を確実に防止することができる。したがって、遮水材21は、直接ピン17と接触せず、不織布15および絶縁材23の表面に吹き付けられる。以上により、洗掘防止体1の表面に、遮水部材25が形成される。なお、ピン17が十分に薄く、強度を有すれば、遮水材21を吹き付けた際に、遮水材21を突きぬけて外部に露出することがないため、絶縁材23は不要である。また、ピン17を用いなくとも、強力接着剤等によって不織布15を強固に洗掘防止体1表面に接着可能であれば、必ずしもピン17を用いる必要はない。   FIG. 4B is an enlarged view of a portion A in FIG. 4A, and is an enlarged cross-sectional view of the state where the water shielding material 21 is sprayed. When the metal pins 17 are used for fixing the nonwoven fabric 15, it is desirable to provide an insulating material 23 that covers the pins 17 from the surface while the water shielding material 21 is sprayed. By providing the insulating material 23 on the pin 17, after the water shielding material 21 is sprayed, the pin 17 does not penetrate the surface of the water shielding material 21 and is not exposed to the outside, thereby reliably preventing corrosion of the pin 17. be able to. Accordingly, the water shielding material 21 does not directly contact the pins 17 but is sprayed on the surfaces of the nonwoven fabric 15 and the insulating material 23. Thus, the water shielding member 25 is formed on the surface of the scouring prevention body 1. If the pins 17 are sufficiently thin and strong, the insulating material 23 is unnecessary because the water shielding material 21 is not exposed to the outside when the water shielding material 21 is sprayed. Even if the pins 17 are not used, the pins 17 are not necessarily used as long as the nonwoven fabric 15 can be firmly bonded to the surface of the scouring prevention body 1 with a strong adhesive or the like.

なお、不織布15を洗掘防止体1に固定する方法は上述の例には限られない。例えば、図5(a)に示すように、保持体3の内部にあらかじめ不織布15を配置しておき、中詰材5が不織布15の内部に投入されていてもよい。このような構成とすることで、不織布15をボンド等で貼り付ける作業が不要となり、また、ピン等を用いる必要もない。   In addition, the method of fixing the nonwoven fabric 15 to the scouring prevention body 1 is not restricted to the above-mentioned example. For example, as shown in FIG. 5A, the nonwoven fabric 15 may be arranged in advance inside the holding body 3 and the filling material 5 may be put into the nonwoven fabric 15. By setting it as such a structure, the operation | work which sticks the nonwoven fabric 15 with a bond etc. becomes unnecessary, and it is not necessary to use a pin etc. FIG.

この場合には、図5(b)に示すように、洗掘防止体1に直接遮水材21を吹き付ければよい。このようにすることで、洗掘防止体1の表面に遮水部材25aを形成することができる。なお、不織布15をあらかじめ洗掘防止体1の内部に配置する場合には、必ずしも使用される全ての洗掘防止体1の内部に不織布15を配置する必要はない。すなわち、図4(a)に示すように、海13に面した側の遮水部材25を形成する部位に設置される洗掘防止体1にのみ、不織布15を配置すればよく、その他の洗掘防止体1には、通常の不織布を有さない洗掘防止体を用いればよい。   In this case, as shown in FIG. 5 (b), the water shielding material 21 may be sprayed directly on the scouring prevention body 1. By doing in this way, the water-impervious member 25a can be formed on the surface of the scouring prevention body 1. In addition, when arrange | positioning the nonwoven fabric 15 in the inside of the scouring prevention body 1 previously, it is not necessary to arrange | position the nonwoven fabric 15 in the inside of all the scouring prevention bodies 1 used. That is, as shown in FIG. 4 (a), the non-woven fabric 15 may be disposed only on the scouring prevention body 1 installed at the site where the water shielding member 25 on the side facing the sea 13 is formed. The digging prevention body 1 may be a scouring prevention body that does not have a normal nonwoven fabric.

次に、上記のようにして施工された防潮堤10の機能について説明する。図6は、防潮堤10が施工された後、津波等によって海13の水位が上昇した状態を示す図である。図6(a)に示すように、水位が防潮堤10の高さよりも低い場合には、防潮堤10の海側の面が遮水部材25によって遮水されているため、水が防潮堤10によって堰き止められ、後方領域に流入することがない。   Next, the function of the seawall 10 constructed as described above will be described. FIG. 6 is a diagram showing a state where the water level of the sea 13 has risen due to a tsunami or the like after the seawall 10 has been constructed. As shown in FIG. 6A, when the water level is lower than the height of the seawall 10, since the sea side surface of the seawall 10 is shielded by the water shielding member 25, the water is Is not blocked and does not flow into the rear region.

また、洗掘防止体1が極めて安定に積み上げられているため、水圧によって、容易に洗掘防止体が崩れたりすることがない。   Moreover, since the scouring prevention bodies 1 are stacked extremely stably, the scouring prevention bodies are not easily collapsed by water pressure.

一方、図6(b)に示すように、水位が防潮堤10の高さよりも高い場合には、水が防潮堤10を乗り越えて、後方に流れ込む。この際、防潮堤10を乗り越えた水は、遮水部材25が形成されない部において、洗掘防止体1の内部に流入する(図中矢印B)。すなわち、水は、防潮堤10の頂部から一気に地盤9上に落下し、地盤近傍で勢いよく地盤を打ちつけることがなく、洗掘防止体1の内部を流れながら、その勢いが抑制されて後方に流れ込む。このため、防潮堤10の後方の地盤9が掘り起こされることが防止される。   On the other hand, as shown in FIG. 6B, when the water level is higher than the height of the seawall 10, the water passes over the seawall 10 and flows backward. At this time, the water over the seawall 10 flows into the scouring prevention body 1 at the portion where the water shielding member 25 is not formed (arrow B in the figure). That is, the water falls on the ground 9 at a stretch from the top of the seawall 10 and does not strike the ground vigorously in the vicinity of the ground, and the momentum is suppressed while flowing through the inside of the scouring prevention body 1. Flows in. For this reason, it is prevented that the ground 9 behind the seawall 10 is dug up.

また、洗掘防止体1同士が連結部材11で連結されるため、水の流れや水圧によって、洗掘防止体が崩れたりすることがない。   Moreover, since the scouring prevention bodies 1 are connected to each other by the connecting member 11, the scouring prevention body is not collapsed by the flow of water or water pressure.

以上、本実施の形態によれば、保持体3に中詰材5が充填された洗掘防止体1を積み上げて防潮堤を構築するため、短期間で施工を行うことができる。このため、余震による津波や、台風による高波など、すぐにでも生じる恐れのある水害に対して、迅速に対応することができる。   As mentioned above, according to this Embodiment, since the scouring prevention body 1 with which the holding | maintenance body 3 was filled with the filling material 5 is piled up and a tide embankment is constructed | assembled, construction can be performed in a short period of time. For this reason, it is possible to quickly respond to flood damage that may occur immediately, such as a tsunami caused by an aftershock or a high wave caused by a typhoon.

また、洗掘防止体1が容易に変形するため、設置場所の地盤9が不陸であっても施工を行うことができる。このため、地盤を平坦にするため工程が不要である。また、洗掘防止体1は、設置した際に偏平して、安定した状態で設置することができるため、洗掘防止体1の崩れ等を防止することができる。   Moreover, since the scouring prevention body 1 is easily deformed, construction can be performed even if the ground 9 of the installation location is uneven. For this reason, a process is unnecessary in order to make the ground flat. Moreover, since the scouring prevention body 1 can be flattened and installed in a stable state when installed, the scouring prevention body 1 can be prevented from collapsing.

また、遮水部材を設けることで、防潮堤まで達した水が、防潮堤の後方に流れ込むことを防止することができる。また、防潮堤の後部には、遮水部材が設けられず、洗掘防止体が露出するため、万が一防潮堤を水が超えた場合にも、防潮堤後方の地盤が水流によって掘り起こされることがない。   Moreover, by providing the water shielding member, it is possible to prevent water that has reached the seawall from flowing into the rear of the seawall. In addition, since there is no water-impervious member at the rear of the tide embankment and the scouring prevention body is exposed, the ground behind the tide embankment may be dug up by the water flow even if the water exceeds the tide embankment. Absent.

また、少なくとも最上部の隣接する洗掘防止体同士が連結されるため、洗掘防止体の崩れを防止することができきる。また、遮水材が固化後に伸縮性を有するため、水の力で洗掘防止体や内部の中詰材が動いても、遮水部材がこの形状変化に追従し、遮水部材が破損することがない。このため、防潮堤の遮水性を維持することができる。   In addition, since at least the uppermost adjacent scouring prevention bodies are connected to each other, the collapse of the scouring prevention bodies can be prevented. In addition, since the water shielding material has elasticity after solidification, even if the scouring prevention body and the internal filling material move due to the force of water, the water shielding member follows this shape change, and the water shielding member is damaged. There is nothing. For this reason, the water-imperviousness of the seawall can be maintained.

次に、他の実施形態について説明する。図7は、地盤9上に、防潮堤を構築する十分なスペースがない場合の防潮堤の施工方法を示す図である。なお、以下の説明において、前述した防潮堤10の施工方法と同様の構成については、重複した説明を省略し、図1から図5と同様の符号を用いる。   Next, another embodiment will be described. FIG. 7 is a diagram showing a construction method of the sea levee when there is not enough space for constructing the sea dyke on the ground 9. In addition, in the following description, about the structure similar to the construction method of the seawall 10 mentioned above, the overlapping description is abbreviate | omitted and the code | symbol similar to FIGS. 1-5 is used.

まず、地盤9から、海13方向の斜面に沿って、海底から洗掘防止体1を積み上げる。この際、特に、海底近傍には、広範囲に洗掘防止体1を配置し、海底の洗掘を防止する。洗掘防止体1は、地盤9の高さ近傍まで積み上げられる。なお、斜面に設けられる洗掘防止体1は、図示したように略水平に積み上げられるのではなく、海13側に傾斜するように配置することもできる。このようにすることで、例えば引き波によって斜面に沿って海側に水流が生じても、洗掘防止体が崩れることを防止することができる。   First, the scouring prevention bodies 1 are piled up from the bottom of the sea 9 along the slope in the direction of the sea 13 from the ground 9. At this time, in particular, in the vicinity of the seabed, the scouring prevention body 1 is disposed over a wide area to prevent scouring of the seabed. The scouring prevention body 1 is stacked up to the vicinity of the height of the ground 9. In addition, the scouring prevention bodies 1 provided on the slope may be arranged so as to be inclined toward the sea 13 side instead of being stacked substantially horizontally as illustrated. By doing in this way, even if a water flow arises on the sea side along a slope by a pulling wave, for example, it can prevent that a scouring prevention body collapses.

次に、図8(a)に示すように、地盤9よりも上方に洗掘防止体1を積み上げる範囲(地盤9および海岸斜面に配置された洗掘防止体洗掘防止体1の上部)に遮水マット31を敷く。遮水マット31としては、摩擦係数が大きなアスファルトマットを用いることができる。   Next, as shown to Fig.8 (a), in the range (upper part of the scouring prevention body 1 scouring prevention body 1 arrange | positioned on the ground 9 and a coastal slope) to pile up the scouring prevention body 1 above the ground 9 Lay the impermeable mat 31. As the water shielding mat 31, an asphalt mat having a large friction coefficient can be used.

遮水マット31上(地盤9および洗掘防止体1上)には、前述した防潮堤10と同様の手順で洗掘防止体1が積み上げられる。また、図8(b)に示すように、海側に面した部位に、遮水部材25が形成される。以上により防潮堤30が形成される。   On the water-impervious mat 31 (on the ground 9 and the scouring prevention body 1), the scouring prevention body 1 is stacked in the same procedure as that of the seawall 10 described above. Moreover, as shown in FIG.8 (b), the water-impervious member 25 is formed in the site | part which faced the sea side. The seawall 30 is formed as described above.

第2の実施の形態にかかる防潮堤30によれば、防潮堤10と同様の効果を得ることができる。また、防潮堤30は、海岸側にも洗掘防止体1を積み上げるため、地盤9に十分なスペースが確保できない部位でも、防潮堤を構築することができる。   According to the seawall 30 according to the second embodiment, the same effect as the seawall 10 can be obtained. Moreover, since the tide embankment 30 piles up the scouring prevention bodies 1 also on the shore side, the tide embankment can be constructed even at a site where a sufficient space cannot be secured in the ground 9.

また、地盤9よりも上方側の洗掘防止体1の下部に、遮水マット31が設けられる。このため、防潮堤30の内部に、洗掘防止体1の下部から水が浸入することがない。すなわち、遮水マット31および遮水部材25によって、防潮堤30の遮水性を確実に確保することができる。   Further, a water-impervious mat 31 is provided at the lower part of the scouring prevention body 1 above the ground 9. For this reason, water does not enter the inside of the tide bank 30 from the lower part of the scouring prevention body 1. That is, the water impervious mat 31 and the water impervious member 25 can ensure the water impermeability of the seawall 30 reliably.

以上、添付図を参照しながら、本発明の実施の形態を説明したが、本発明の技術的範囲は、前述した実施の形態に左右されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。   As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

たとえば、遮水部材としては、不織布に遮水材を吹き付けて構成したが、遮水シートによって洗掘防止体の所定範囲を被覆してもよい。この場合、積み上げられた洗掘防止体の表面に遮水シートを配置してもよく、洗掘防止体同士の隙間に配置してもよい。   For example, the water shielding member is configured by spraying a water shielding material on a nonwoven fabric, but a predetermined range of the scouring prevention body may be covered with a water shielding sheet. In this case, a water shielding sheet may be arranged on the surface of the piled scouring prevention bodies, or may be arranged in a gap between the scouring prevention bodies.

また、本発明によって迅速に防潮堤を構築したのち、さらに安定性を高めるため、防潮堤の後方に鋼管杭等を打設し、防潮堤の後方にさらに壁体を構築してもよい。このような壁体の構築には工数を要するが、本発明の施工方法と組み合わせることによって、迅速に最低限の防潮堤を構築した後、時間をかけて、より高い防潮堤を構築することができる。   Moreover, after constructing a seawall quickly according to the present invention, in order to further enhance the stability, a steel pipe pile or the like may be placed behind the seawall and a wall body may be further constructed behind the seawall. Construction of such a wall requires man-hours, but by combining it with the construction method of the present invention, it is possible to quickly build a minimum seawall and then build a higher seawall over time. it can.

また、積み上げられる洗掘防止体の一部(例えば防潮堤の内部に位置する洗掘防止体)を通常の土のうと置き換えてもよい。すなわち、防潮堤の内部は、必ずしも全て洗掘防止体である必要はない。また、洗掘防止体の配置は、千鳥状にしてもよい。このようにすることで、より安定した防潮堤を構築することができる。   Moreover, you may replace some scouring prevention bodies piled up (for example, the scouring prevention body located inside a seawall) with normal sandbags. That is, the inside of the seawall does not necessarily have to be a scouring prevention body. The arrangement of the scouring prevention bodies may be staggered. By doing in this way, a more stable seawall can be constructed.

また、洗掘防止体同士は、図2等に示したように、必ずしも水平になるように載置する必要はない。例えば、図9(a)に示すように、互いの端部同士が重なり合うようにして配置してもよい。このようにすることで、互いの動きを抑制することができるとともに、重なり代を調整することで、防潮堤の幅(図中左右方向)を任意に調整可能であるため、より設計自由度が高くなり、より安定した台形状の防潮堤を構築することができる。   Further, as shown in FIG. 2 and the like, the scouring prevention bodies do not necessarily have to be placed horizontally. For example, as shown to Fig.9 (a), you may arrange | position so that an edge part may mutually overlap. By doing so, the movement of each other can be suppressed, and the width of the seawall (left and right in the figure) can be arbitrarily adjusted by adjusting the overlap allowance, so there is more design freedom. It becomes higher and a more stable trapezoidal seawall can be constructed.

また、図9(b)に示すように、下部に突出部33を有する洗掘防止体1aを用いてもよい。この場合、洗掘防止体1aを併設する際に、隣の洗掘防止体1aの突出部33と重なるようにして洗掘防止体1aを設置すればよい(図中矢印C方向)。互いの突出部33上に洗掘防止体を並べることで、洗掘防止体のずれを防止することができる。   Moreover, as shown in FIG.9 (b), you may use the scouring prevention body 1a which has the protrusion part 33 in the lower part. In this case, when the scouring prevention body 1a is provided, the scouring prevention body 1a may be installed so as to overlap with the protrusion 33 of the adjacent scouring prevention body 1a (in the direction of arrow C in the figure). By arranging the scouring prevention bodies on the protrusions 33 of each other, it is possible to prevent the scouring prevention bodies from shifting.

1、1a………洗掘防止体
3………保持体
5………中詰材
7………吊りリング
9………地盤
10、30………防潮堤
11………連結部材
13………海
15………不織布
17………ピン
19………吹き付け装置
21………遮水材
23………絶縁材
25、25a………遮水部材
31………遮水マット
33………突出部
DESCRIPTION OF SYMBOLS 1, 1a ......... Scouring prevention body 3 ......... Holding body 5 ......... Inner filling material 7 ......... Suspension ring 9 ......... Ground 10, 30 ......... Seawall 11 ......... Connecting member 13 ... ...... Sea 15 ......... Nonwoven fabric 17 ......... Pin 19 ......... Blowing device 21 ......... Water shielding material 23 ......... Insulating material 25, 25a ......... Water shielding member 31 ......... Water shielding mat 33 ... ...... Protrusions

Claims (8)

防潮堤の施工方法であって、
水を透過可能な保持体と、前記保持体の内部に充填される中詰材とを有する洗掘防止体を複数用い、
前記洗堀防止体を、海岸または河川近傍の地盤上に積み上げ、
積み上げられた前記洗堀防止体の少なくとも海岸または河川方向に面する部位を遮水部材で被覆することを特徴とする防潮堤の施工方法。
A method of constructing a seawall,
Using a plurality of scouring prevention bodies having a water-permeable holding body and a filling material filled in the holding body,
The scouring prevention body is stacked on the ground near the coast or river,
A construction method of a tide embankment characterized in that at least a portion facing the coast or river direction of the scouring prevention bodies stacked is covered with a water shielding member.
積み上げられた前記洗堀防止体の少なくとも海岸または河川方向とは反対側に面する部位には前記遮水部材が設けられず、前記洗掘防止体が露出することを特徴とする請求項1記載の防潮堤の施工方法。   2. The scouring prevention body is exposed at least at a portion of the stacked scouring prevention body that faces away from the coast or river direction, and the water shielding member is not provided. Construction method of seawall. 前記保持体は編み込まれた袋体であり、前記洗堀防止体を地盤上に載置すると、偏平形状に変形可能であり、地盤上に載置された前記洗掘防止体の幅に対する高さが1/3以下であり、
少なくとも最上部に位置する前記洗堀防止体同士が連結されることを特徴とする請求項1または請求項2に記載の防潮堤の施工方法。
The holding body is a woven bag body, and when the scouring prevention body is placed on the ground, it can be deformed into a flat shape, and the height relative to the width of the scouring prevention body placed on the ground Is 1/3 or less,
The construction method of a seawall according to claim 1 or 2, wherein the scouring prevention bodies positioned at least at the uppermost part are connected to each other.
前記遮水部材は、積み上げられた前記洗堀防止体の少なくとも海岸または河川方向に面する部位に不織布を設け、前記不織布の表面に、固化後に伸縮が可能な遮水材を吹き付けることで形成することを特徴とする請求項1から請求項3のいずれかに記載の防潮堤の施工方法。   The water-impervious member is formed by providing a nonwoven fabric on at least a portion facing the coast or river direction of the stacked scouring prevention bodies, and spraying a water-impervious material that can expand and contract after solidification on the surface of the nonwoven fabric. The construction method of a seawall in any one of Claims 1-3 characterized by the above-mentioned. 前記不織布は、編み込まれた袋体である保持体の編み部にピンで固定されることを特徴とする請求項4記載の防潮堤の施工方法。   The said nonwoven fabric is fixed to the knitting part of the holding body which is a knitted bag body with a pin, The construction method of the seawater bank of Claim 4 characterized by the above-mentioned. 少なくとも一部の保持体の内部には、あらかじめ不織布が配置され、前記中詰材は、前記不織布の内部に充填され、
前記不織布が内部に配置された前記洗掘防止体を、少なくとも海岸または河川方向に面する部位に積み上げ、
前記遮水部材は、少なくとも海岸または河川方向に面する前記不織布の表面に、固化後に伸縮が可能な遮水材を吹き付けることで形成することを特徴とする請求項1から請求項3のいずれかに記載の防潮堤の施工方法。
Inside the at least part of the holding body, a non-woven fabric is arranged in advance, and the filling material is filled inside the non-woven fabric,
The scouring prevention body in which the nonwoven fabric is disposed is stacked at least on a portion facing the coast or river direction,
The said water-impervious member is formed by spraying a water-impervious material capable of expanding and contracting after solidification on at least the surface of the nonwoven fabric facing the coast or river direction. Construction method of the seawall as described in 2.
前記遮水部材は遮水シートであり、積み上げられた前記洗堀防止体の少なくとも海岸または河川方向に面する部位に前記遮水シートが貼り付けられることを特徴とする請求項1から請求項3のいずれかに記載の防潮堤の施工方法。   The said water-impervious member is a water-impervious sheet, and the said water-impervious sheet is affixed to the site | part which faces at least the coast or river direction of the said scouring prevention body piled up. A method of constructing a seawall as described in any of the above. 前記地盤上に前記洗堀防止体を配置する前に、前記地盤から海岸または河川方向に向かって形成される斜面に前記洗堀防止体を配置し、前記地盤よりも上部の前記洗堀防止体と、前記地盤よりも下部の前記洗堀防止体との間に、あらかじめ遮水マットを配置することを特徴とする請求項1から請求項7のいずれかに記載の防潮堤の施工方法。   Before disposing the scouring prevention body on the ground, the scouring prevention body is disposed on a slope formed from the ground toward the coast or a river, and the scouring prevention body above the ground. The construction method of a tide embankment according to any one of claims 1 to 7, wherein a water shielding mat is disposed in advance between the scouring prevention body below the ground and the scouring prevention body.
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Publication number Priority date Publication date Assignee Title
JPH0296010A (en) * 1988-10-03 1990-04-06 Dynic Corp Connectable bags
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JP2003129444A (en) * 2001-10-24 2003-05-08 Kyowa Co Ltd Bag material for civil engineering with ocean wave resistance having middle binder and manufacturing method of bag body for civil engineering with ocean resistance using the same
JP2003171918A (en) * 2001-12-04 2003-06-20 Tetra Co Ltd Back-fill structure and back-fill construction method
JP2005113470A (en) * 2003-10-07 2005-04-28 Kanden Plant Kk Slope curing method
JP3122398U (en) * 2005-10-07 2006-06-15 株式会社フィックス River embankment
JP2009024474A (en) * 2007-06-19 2009-02-05 Nippon Solid Co Ltd Flexible bag

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0296010A (en) * 1988-10-03 1990-04-06 Dynic Corp Connectable bags
JPH11216439A (en) * 1998-02-02 1999-08-10 Seibu Construction Co Ltd Method for building impervious layer of slope or the like, impervious layer of slope or the like and application for production of sandbag
JP2003129444A (en) * 2001-10-24 2003-05-08 Kyowa Co Ltd Bag material for civil engineering with ocean wave resistance having middle binder and manufacturing method of bag body for civil engineering with ocean resistance using the same
JP2003171918A (en) * 2001-12-04 2003-06-20 Tetra Co Ltd Back-fill structure and back-fill construction method
JP2005113470A (en) * 2003-10-07 2005-04-28 Kanden Plant Kk Slope curing method
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