JP6871583B1 - Washing prevention unit and washing prevention structure - Google Patents
Washing prevention unit and washing prevention structure Download PDFInfo
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- JP6871583B1 JP6871583B1 JP2020127254A JP2020127254A JP6871583B1 JP 6871583 B1 JP6871583 B1 JP 6871583B1 JP 2020127254 A JP2020127254 A JP 2020127254A JP 2020127254 A JP2020127254 A JP 2020127254A JP 6871583 B1 JP6871583 B1 JP 6871583B1
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- 230000002265 prevention Effects 0.000 title claims abstract description 98
- 238000005406 washing Methods 0.000 title claims description 10
- 239000000463 material Substances 0.000 claims abstract description 119
- 238000009991 scouring Methods 0.000 claims abstract description 97
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000000452 restraining effect Effects 0.000 claims abstract description 12
- 239000004744 fabric Substances 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 238000005315 distribution function Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
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- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
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Abstract
【課題】変形追従機能と応力分散機能の組合せによって、津波などによる局所的な速い水流に対して構造全体で抵抗可能な、粘り強い構造の洗堀防止ユニットと、地盤拘束機能によって高い洗堀防止効果と吸出し防止効果を発揮可能な洗堀防止構造を提供する。【解決手段】地盤の起伏に追従可能な柔軟性を備える拘束面材２０と、拘束面材２０上に配列して拘束面材２０に固定した複数の根固め材１０とを備え、複数の根固め材１０はそれぞれ編地からなる袋体１１と袋体の内部に充填した中詰材を有し、複数の根固め材１０の荷重によって拘束面材２０を介して拘束面材２０背面の地盤を拘束可能に構成した。【選択図】図２PROBLEM TO BE SOLVED: To provide a tenacious structure of a scouring prevention unit capable of resisting a local fast water flow due to a tsunami or the like by a combination of a deformation following function and a stress distribution function, and a high scouring prevention effect by a ground restraining function. To provide a scouring prevention structure that can exert a suction prevention effect. SOLUTION: The restraint surface material 20 having flexibility capable of following the undulations of the ground, and a plurality of root hardening materials 10 arranged on the restraint surface material 20 and fixed to the restraint surface material 20 are provided, and a plurality of roots are provided. The solidifying material 10 has a bag body 11 made of knitted fabric and a filling material filled inside the bag body, respectively, and the ground on the back surface of the restraining surface material 20 is passed through the restraining surface material 20 by the load of the plurality of root solidifying materials 10. Was configured to be restrainable. [Selection diagram] Fig. 2
Description
本発明は洗堀防止ユニット及び洗堀防止構造に関し、特に、根固め材及び拘束面材の変形追従機能と拘束面材の応力分散機能の組合せによって、津波などによる局所的な速い水流に対して構造全体で抵抗可能な、粘り強い構造の洗堀防止ユニットと、地盤拘束機能によって高い洗堀防止効果と吸出し防止効果を発揮可能な、洗堀防止構造に関する。 The present invention relates to a scouring prevention unit and a scouring prevention structure, and in particular, by combining the deformation tracking function of the root hardening material and the restraint surface material and the stress distribution function of the restraint surface material, it is possible to cope with a local fast water flow due to a tsunami or the like. The present invention relates to a scouring prevention unit having a tenacious structure that can resist the entire structure, and a scouring prevention structure that can exert a high scouring prevention effect and suction prevention effect by the ground restraint function.
港湾や海岸部には、大型の津波、高波浪から背後地を守るべく防波堤が設置されている。
防波堤には、傾斜提、直立提、混成提等の種類がある。例えば直立提の場合、海底に敷き込んだ基礎捨石上に、コンクリート製ケーソン等の重力式構造物を配置してなる。基礎捨石の上部は、基部の洗堀防止及び基礎捨石の吸出し防止のため、被覆ブロック等で被覆する。
一方、近年の気候変動等に伴って、波力等の外力は増大の傾向にあり、既存の防波堤の安定性について見直しが求められている。
特に、津波や高波浪に起因する極めて早い水流によって防波堤の基部に局所洗掘が生じることで、防波堤の安定性が大きく損なわれるため、いかにして既存の防波堤を洗堀から保護し、粘り強い構造を達成するかが、喫緊の課題となっている。
以上は、防波堤に限らず、海岸堤防、河川堤防、洋上風力発電施設の基礎等の様々な水中構造物に共通する課題である。
水中構造物の洗堀を防止する技術として、構造物の前面に、特許文献１又は２に開示されるネット状の中詰袋体を複数配置することで、基部の洗堀を防止する技術が知られている。
このほか、特許文献３には、重力式ケーソン防波堤の基礎捨石を、筒状の連続袋体で被覆して保護する技術が開示されている。
特許文献４には、基礎捨石を被覆する被覆ブロックを、杭体で基礎捨石上に固定する技術が開示されている。
Breakwaters have been installed in harbors and coastal areas to protect the hinterland from large tsunamis and high waves.
There are various types of breakwaters, such as inclined ridges, upright ridges, and mixed ridges. For example, in the case of an upright sill, a gravity-type structure such as a concrete caisson is placed on the foundation rubble laid on the seabed. The upper part of the foundation rubble is covered with a covering block or the like to prevent scouring of the base and prevention of suction of the foundation rubble.
On the other hand, with recent climate change, external forces such as wave power tend to increase, and the stability of existing breakwaters is required to be reviewed.
In particular, the extremely fast water flow caused by the tsunami and high waves causes local scouring at the base of the breakwater, which greatly impairs the stability of the breakwater. Is an urgent issue.
The above are issues common not only to breakwaters but also to various underwater structures such as coastal levees, river levees, and foundations of offshore wind power generation facilities.
As a technique for preventing scouring of an underwater structure, there is a technique for preventing scouring of a base by arranging a plurality of net-shaped filling bags disclosed in
In addition, Patent Document 3 discloses a technique for protecting the foundation rubble of a gravity-type caisson breakwater by covering it with a continuous tubular bag.
Patent Document 4 discloses a technique of fixing a covering block covering a foundation rubble on the foundation rubble with a pile body.
複数の中詰袋体で基部を被覆する技術は、水流に対して中詰袋体が単体の重量で抵抗する構成であるため、津波等の強い水流を受けることで移動して、機能しなくなることがある。
また、中詰袋体は扁平な球状の形状を呈するため、転動しやすく、特に積み上げた構造は不安定であり、崩れやすい。
このように、中詰袋体が流失したり崩れる度に再設置する必要があり、維持管理コストが多大なものとなる。
被覆ブロックで被覆する技術は、コンクリート製のブロックや、鋼製の連結材が腐食しやすく、耐用期間に限界がある。また、単体の重量が小さいため、水流により容易に移動して機能しなくなる。
また、被覆ブロックの敷き直しには非常に手間がかかるため、維持管理コストが嵩む。
The technology of covering the base with a plurality of filled bag bodies is such that the filled bag body resists the water flow by the weight of a single body, so that it moves due to a strong water flow such as a tsunami and does not function. Sometimes.
Further, since the filled bag body has a flat spherical shape, it is easy to roll, and in particular, the stacked structure is unstable and easily collapses.
In this way, it is necessary to re-install each time the filled bag body is washed away or collapsed, resulting in a large maintenance cost.
In the technique of covering with a covering block, concrete blocks and steel connecting materials are easily corroded, and the service life is limited. In addition, since the weight of the single unit is small, it easily moves due to the water flow and does not function.
In addition, it takes a lot of time and effort to re-lay the covering block, which increases the maintenance cost.
本発明は、上記のような課題を解決可能な、洗堀防止ユニット及び洗堀防止構造を提供することを目的とする。 An object of the present invention is to provide a scouring prevention unit and a scouring prevention structure capable of solving the above problems.
本発明の洗堀防止ユニットは、地盤の起伏に追従可能な柔軟性を備える拘束面材と、拘束面材上に配列して拘束面材に固定した複数の根固め材と、を備え、複数の根固め材はそれぞれ、編地からなる袋体と、袋体の内部に充填した中詰材を有し、複数の根固め材の荷重によって、拘束面材を介して、拘束面材背面の地盤を拘束可能に構成したことを特徴とする。 The scouring prevention unit of the present invention includes a plurality of restraint surface materials having flexibility capable of following the undulations of the ground, and a plurality of root hardening materials arranged on the restraint surface material and fixed to the restraint surface material. Each of the root hardening materials has a bag body made of knitted fabric and a filling material filled inside the bag body. The feature is that the ground can be restrained.
本発明の洗堀防止ユニットは、拘束面材が、透水性を有していてもよい。 In the scouring prevention unit of the present invention, the restraint surface material may have water permeability.
本発明の洗堀防止ユニットは、拘束面材が、繊維製の網体からなってもよい。 In the scouring prevention unit of the present invention, the restraint surface material may be made of a fiber net.
本発明の洗堀防止ユニットは、複数の根固め材の隙間に充填した間詰材を備えていてもよい。 The scouring prevention unit of the present invention may include a filling material filled in the gaps between a plurality of root hardening materials.
本発明の洗堀防止構造は、基部と地盤の境界の少なくとも一部を覆うように配置した、洗堀防止ユニットを備え、拘束面材の縁部の下部が洗堀されることで、下方に移動した根固め材の荷重と上方に残った根固め材の荷重により、拘束面材を介して拘束面材背面の地盤を拘束可能に構成したことを特徴とする。 The scouring prevention structure of the present invention includes a scouring prevention unit arranged so as to cover at least a part of the boundary between the base and the ground, and the lower part of the edge of the restraint surface material is scoured to lower the scouring. It is characterized in that the ground on the back surface of the restraining surface material can be restrained via the restraining surface material by the load of the root hardening material that has moved and the load of the root hardening material that remains above.
本発明の洗堀防止構造は、複数の洗堀防止ユニットを拘束面材で相互に連結してもよい。 In the scouring prevention structure of the present invention, a plurality of scouring prevention units may be connected to each other with a restraining surface material.
本発明の洗堀防止構造は、複数の洗堀防止ユニットを、構造物の角部又は湾曲部を囲んで配置してもよい。 In the scouring prevention structure of the present invention, a plurality of scouring prevention units may be arranged so as to surround a corner portion or a curved portion of the structure.
本発明の洗堀防止構造は、複数の洗堀防止ユニットを積層してもよい。 In the scouring prevention structure of the present invention, a plurality of scouring prevention units may be laminated.
本発明の洗堀防止ユニットは、根固め材及び拘束面材の変形追従機能と、拘束面材の応力分散機能の組合せによって、津波などによる局所的な速い水流に対して、構造全体で抵抗可能な、粘り強い構造を達成できる。
本発明の洗堀防止構造は、複数の根固め材と拘束面材の協働による地盤拘束機能と、複数の根固め材が拘束面材を介して相互に荷重伝達することによるユニット単体の重量増加によって、高い洗堀防止効果及び吸出し防止効果を奏することができる。
また、複数の洗堀防止ユニットを、相互に連結したり積層することによって、洗堀防止構造をより重厚な構造にして、洗堀防止効果と吸出し防止効果を更に向上させることができる。
さらに、構造物の維持管理として、２０〜５０年に一度程度、既設の洗堀防止ユニットの上方に新たな洗堀防止ユニットを設置すれば、地盤の洗堀に追従変形した既設の洗堀防止ユニットと、新設の洗堀防止ユニットとが一体となって基部地盤を抱き込むことで、新設時以上の洗堀防止効果を発揮し、構造物の耐用年数を延長させることが可能となる。
The scouring prevention unit of the present invention is capable of resisting a local fast water flow due to a tsunami or the like in the entire structure by combining the deformation tracking function of the root hardening material and the restraint surface material and the stress distribution function of the restraint surface material. A tenacious structure can be achieved.
The scouring prevention structure of the present invention has a ground restraint function by the cooperation of a plurality of root compactors and a restraint surface material, and the weight of a single unit due to mutual load transmission of the plurality of root compactors via the restraint surface materials. By increasing the amount, a high scouring prevention effect and a suction prevention effect can be achieved.
Further, by connecting or laminating a plurality of scouring prevention units to each other, the scouring prevention structure can be made a heavier structure, and the scouring prevention effect and the suction prevention effect can be further improved.
Furthermore, as maintenance of the structure, if a new scouring prevention unit is installed above the existing scouring prevention unit about once every 20 to 50 years, the existing scouring prevention that follows the ground scouring and is deformed. By embracing the base ground together with the unit and the newly installed scouring prevention unit, it is possible to exert a scouring prevention effect more than at the time of new installation and extend the useful life of the structure.
以下、図面を参照しながら本発明の洗堀防止ユニット及び洗堀防止構造について詳細に説明する。なお、洗堀防止ユニットについては洗堀防止構造の説明内において説明する。
なお、本発明において「洗堀」とは、水流によって水底の土が削り取られること、及び水底面が吸い出されることを意味する。
本発明において「上」「下」「高さ」「幅」「水平方向」「垂直方向」等の方向性の用語は、洗堀防止ユニットを水底に配置した状態における各方向を意味する。
Hereinafter, the scouring prevention unit and the scouring prevention structure of the present invention will be described in detail with reference to the drawings. The scouring prevention unit will be described in the description of the scouring prevention structure.
In the present invention, "washing" means that the soil on the bottom of the water is scraped off by the water flow and that the bottom of the water is sucked out.
In the present invention, directional terms such as "up", "down", "height", "width", "horizontal direction", and "vertical direction" mean each direction when the scouring prevention unit is placed on the bottom of the water.
[洗堀防止構造]
＜１＞全体の構成（図１）。
本発明の洗堀防止構造Ａは、構造物Ｂの周辺の砂の洗堀防止機能と、基部Ｂ１周辺の砂の吸出し防止機能を兼備した構造である。
洗堀防止構造Ａは、構造物Ｂの基部Ｂ１と地盤の境界の少なくとも一部を、後述する洗堀防止ユニット１で被覆してなる。
洗堀防止ユニット１は、基部Ｂ１を囲むように複数ユニットを連続配置するのが望ましい。この際、隣接する洗堀防止ユニット１を拘束面材２０で相互に連結してもよい。
本例では、相互に連結した複数の洗堀防止ユニット１で、基部Ｂ１の３面を囲い込んで配置する。
このように、連結した洗堀防止ユニット１で、構造物Ｂの基部Ｂ１の角部や湾曲部を囲むことで、基部Ｂ１の片側に、洗堀防止ユニット１を基部Ｂ１から引き離すような水流が生じた際に、基部Ｂ１の反対側の洗堀防止ユニット１が基部Ｂ１に引っ掛かってこれに抵抗するという、相互拘束効果を生じさせることができる。
これによって、例えば津波による短期的な押し波と引き波の反復に対して、基部Ｂ１両側の洗堀防止ユニット１が一体に抵抗することで、洗堀防止ユニット１の流失を防ぐことができる。
[Washing prevention structure]
<1> Overall configuration (Fig. 1).
The scouring prevention structure A of the present invention is a structure having both a sand scouring prevention function around the structure B and a sand suction prevention function around the base B1.
The scouring prevention structure A is formed by covering at least a part of the boundary between the base portion B1 of the structure B and the ground with the
It is desirable that a plurality of units of the
In this example, a plurality of
By surrounding the corners and curved portions of the base portion B1 of the structure B with the connected
As a result, for example, the
＜２＞構造物。
本発明の洗堀防止構造Ａを適用する構造物Ｂは、水底に基部Ｂ１を有する構造物である。
本例では、構造物Ｂとして、コンクリート製ケーソンからなる防波堤（直立提）の例について説明する。
ただし、構造物Ｂはこれに限られず、海岸堤防、河川堤防、洋上風力発電施設の基礎等にも適用可能である。また、防波堤も直立提に限らず、傾斜提又は混成提であってもよい。
要は水底に基部Ｂ１があり、水流によって洗堀を受ける可能性があれば、いかなる構造物Ｂにも適用できる。
<2> Structure.
The structure B to which the scouring prevention structure A of the present invention is applied is a structure having a base B1 on the bottom of the water.
In this example, an example of a breakwater (upright ridge) made of a concrete caisson as the structure B will be described.
However, the structure B is not limited to this, and can be applied to coastal levees, river levees, foundations of offshore wind power generation facilities, and the like. Further, the breakwater is not limited to the upright sill, but may be a sloping sill or a mixed sill.
In short, it can be applied to any structure B as long as it has a base B1 on the bottom of the water and can be washed by a stream of water.
＜３＞洗堀防止ユニット（図２）。
洗堀防止ユニット１は、複数の根固め材１０と、拘束面材２０と、を少なくとも備える、マット状の部材である。
詳細には、地盤上に展開した拘束面材２０の上に、複数の根固め材１０を並列し、各根固め材１０を拘束面材２０に固定してなる。
本例では、根固め材１０の下方の数か所で、根固め材１０の袋体１１の網目と拘束面材２０の網目にロープを連通して締結する。ただし根固め材１０の固定手段はこれに限られず、公知の各種手段を採用することができる。
また、本例では隣り合う根固め材１０の隙間に間詰材３０を充填している。
本例では、略正方形の拘束面材２０上に、３個×３列＝合計９個の根固め材１０を、等間隔に配置する。ただし、根固め材１０の数や配列はこれに限らず、適宜の数と配列を採用することができる。例えば根固め材１０を千鳥状に配置してもよい。
本例では、根固め材１０同士を直接連結はしないが、ロープ等を介して隣り合う根固め材１０同士を直接連結してもよい。
本発明の洗堀防止ユニット１は、根固め材１０及び拘束面材２０の変形追従機能と、拘束面材２０の応力分散機能の組合せによって、津波などによる局所的な速い水流に対して、構造全体で抵抗可能な、粘り強い構造に特徴を有する。
<3> Washing prevention unit (Fig. 2).
The scouring
Specifically, a plurality of root hardening materials 10 are arranged in parallel on the restraint surface material 20 developed on the ground, and each root hardening material 10 is fixed to the restraint face material 20.
In this example, ropes are communicated and fastened to the mesh of the bag body 11 of the root compactor 10 and the mesh of the restraint surface material 20 at several places below the root compactor 10. However, the fixing means of the root hardening material 10 is not limited to this, and various known means can be adopted.
Further, in this example, the filling material 30 is filled in the gap between the adjacent root hardening materials 10.
In this example, 3 × 3 rows = a total of 9 root hardening materials 10 are arranged at equal intervals on a substantially square restraint surface material 20. However, the number and arrangement of the root hardening materials 10 are not limited to this, and an appropriate number and arrangement can be adopted. For example, the root hardening material 10 may be arranged in a staggered pattern.
In this example, the root hardening materials 10 are not directly connected to each other, but adjacent root hardening materials 10 may be directly connected to each other via a rope or the like.
The scouring
＜３．１＞根固め材。
根固め材１０は、荷重により地盤を抑え込む部材である。
根固め材１０は、袋体１１と、袋体１１の内部に充填した中詰材１２と、を少なくとも備える。
袋体１１は、袋状の編地からなる。より詳細には、例えばポリエステル繊維からなる筒状のラッセル編地の下端を絞り込んで底網を形成し、上端部側の開口を袋口として形成した円形袋状の構造を採用する。ただしこれに限らず、編地はナイロン製、ポリエチレン製等であってもよい。また、袋体１１は円形袋状に限らず、直方体形状であってもよい。
袋体１１の袋口には、袋口を絞って閉じるための、袋口ロープを挿通する。
本例では中詰材１２として、直径１５０ｍｍ程度の砕石を採用する。ただしこれに限らず、適宜の直径の、玉石その他の自然骨材やコンクリートガラ等を採用することができる。
<3.1> Root hardening material.
The root hardening material 10 is a member that holds down the ground by a load.
The root hardening material 10 includes at least a bag body 11 and a filling material 12 filled inside the bag body 11.
The bag body 11 is made of a bag-shaped knitted fabric. More specifically, for example, a circular bag-like structure is adopted in which the lower end of a tubular Russell knitted fabric made of polyester fiber is narrowed down to form a bottom net, and the opening on the upper end side is formed as a bag opening. However, the present invention is not limited to this, and the knitted fabric may be made of nylon, polyethylene, or the like. Further, the bag body 11 is not limited to a circular bag shape, and may have a rectangular parallelepiped shape.
A bag mouth rope for squeezing and closing the bag mouth is inserted into the bag mouth of the bag body 11.
In this example, crushed stone having a diameter of about 150 mm is used as the filling material 12. However, the present invention is not limited to this, and boulders and other natural aggregates, concrete glass, etc. having an appropriate diameter can be adopted.
＜３．２＞拘束面材。
拘束面材２０は、地盤を面状に拘束する部材である。
拘束面材２０は、地盤の起伏に追従可能な柔軟性を備える、ネット体又はシート体からなる。
拘束面材２０は、透水性、不透水性いずれであってもよいが、水流によるめくれを防ぐためには透水性を有する構造とすることが望ましい。
本例では拘束面材２０として、ポリエステル繊維製の網体を採用する。
拘束面材２０を網体とすることで、津波等によって局所的にかかる水圧を、網体の張力によって拘束面材２０全体に分散して抵抗することができる。
拘束面材２０はポリエステル繊維製の網体に限らず、例えばポリウレタン繊維製の網体、メッシュシート、適宜の素材の不織布や多重布等を採用してもよいが、十分な引張強度と耐摩耗性を備えた素材・構造とすることに留意する。
<3.2> Restraint surface material.
The restraint surface material 20 is a member that restrains the ground in a plane shape.
The restraint surface material 20 is made of a net body or a sheet body having flexibility capable of following the undulations of the ground.
The restraint surface material 20 may be either water-permeable or impermeable, but it is desirable that the restraint surface material 20 has a water-permeable structure in order to prevent it from being turned over by a water flow.
In this example, a mesh made of polyester fiber is used as the restraint surface material 20.
By using the restraint surface material 20 as a net body, the water pressure locally applied by a tsunami or the like can be dispersed and resisted by the tension of the net body over the entire restraint face material 20.
The restraint surface material 20 is not limited to the polyester fiber net body, and for example, a polyurethane fiber net body, a mesh sheet, a non-woven fabric of an appropriate material, multiple cloths, or the like may be adopted, but sufficient tensile strength and abrasion resistance may be adopted. Keep in mind that the material and structure should be of a nature.
＜３．３＞間詰材。
間詰材３０は、複数の根固め材１０の隙間に間詰する部材である。
複数の根固め材１０の隙間を間詰材３０で塞ぐことで、複数の根固め材１０同士の一体性を高めて一体に挙動させるとともに、洗堀防止ユニット１全体の重量を増加させ、後述する地盤拘束機能を高めることができる。
本例では間詰材３０として、直径１５０ｍｍ程度の砕石を採用する。ただしこれに限らず、適宜の直径の、玉石その他の自然骨材やコンクリートガラ等を採用することができる。
<3.3> Filling material.
The filling material 30 is a member that fills the gaps between the plurality of root hardening materials 10.
By closing the gaps between the plurality of root hardening materials 10 with the filling material 30, the integrity of the plurality of root hardening materials 10 is enhanced and the plurality of root hardening materials 10 are made to behave integrally, and the weight of the entire scouring
In this example, crushed stone having a diameter of about 150 mm is used as the filling material 30. However, the present invention is not limited to this, and boulders and other natural aggregates, concrete glass, etc. having an appropriate diameter can be adopted.
＜３．４＞地盤拘束機能（図３）。
洗堀防止ユニット１は、地盤の先行洗堀に伴い、拘束面材２０が自律的に地盤を拘束する、地盤拘束機能を備える。詳細には、洗堀防止ユニット１は以下のように機能する。
構造物Ｂの基部Ｂ１と地盤の境界を洗堀防止ユニット１で覆うことで、水流による基部Ｂ１前面の地盤の洗堀を防ぐ。一方、水流が洗堀防止ユニット１前方の地盤（詳細には拘束面材２０の縁部付近の地盤）を洗堀することで、地盤上に先行洗堀部Ｃが形成される。
洗堀が進み、先行洗堀部Ｃが深くなると、最前列の根固め材１０が先行洗堀部Ｃ内に落ち込み、落ち込んだ根固め材１０の荷重により拘束面材２０の前縁部が下方に引っ張られる。
一方、拘束面材２０の他部は、上方に残った他の根固め材１０の荷重により地盤に支圧されているため、拘束面材２０の下方への移動が規制される。
こうして、先行洗堀部Ｃ内の根固め材１０の荷重と、先行洗堀部Ｃ外の根固め材１０の荷重とにより、拘束面材２０が上下方向に引っ張られることで、拘束面材２０が背面の地盤を包み込むように拘束する。
以上のように、本発明の洗堀防止ユニット１は、基部Ｂ１の洗堀を防ぎつつ、拘束面材２０の前方に先行洗堀部Ｃを形成することで、拘束面材２０によって地盤を抱き込むように拘束し、極めて速い水流に対しても安定した洗堀防止効果を奏することができる。
<3.4> Ground restraint function (Fig. 3).
The scouring
By covering the boundary between the base B1 of the structure B and the ground with the scouring
As the scouring progresses and the leading scouring portion C becomes deeper, the root hardening material 10 in the front row falls into the leading scouring portion C, and the front edge portion of the restraint surface material 20 is pulled downward by the load of the depressed root hardening material 10. Be done.
On the other hand, since the other part of the restraint surface material 20 is supported on the ground by the load of the other root hardening material 10 remaining above, the downward movement of the restraint surface material 20 is restricted.
In this way, the restraint surface material 20 is pulled in the vertical direction by the load of the root hardening material 10 inside the preceding scouring portion C and the load of the root hardening material 10 outside the preceding scouring portion C, so that the restraint surface material 20 is backed up. Restrained to wrap around the ground.
As described above, the scouring
[洗堀防止ユニットを積層した例]
洗堀防止構造Ａは、複数の洗堀防止ユニット１を積層して構成してもよい（図４）。この場合、上下の洗堀防止ユニット１同士を連結してもよい。
洗堀防止ユニット１を積層することで、上層の根固め材１０が、自重によって下層の根固め材１０の配列の隙間に嵌り込む。このように、上下の根固め材１０によって上層の拘束面材２０を立体的に噛み込むことで、洗堀防止構造Ａ全体の一体性が高まる。
本例の場合、洗堀防止構造Ａの重量と厚みが倍加してより重厚な構造となることで、洗堀防止構造Ａの洗堀防止機能と吸出し防止機能が更に高まる。
[Example of stacking scouring prevention units]
The scouring prevention structure A may be configured by laminating a plurality of scouring prevention units 1 (FIG. 4). In this case, the upper and lower scouring
By stacking the scouring
In the case of this example, the weight and thickness of the scouring prevention structure A are doubled to form a heavier structure, so that the scouring prevention function and the suction prevention function of the scouring prevention structure A are further enhanced.
１ 洗堀防止ユニット
１０ 根固め材
１１ 袋体
１２ 中詰材
２０ 拘束面材
３０ 間詰材
Ａ 洗堀防止構造
Ｂ 構造物
Ｂ１ 基部
Ｃ 先行洗堀部
1 Moat prevention unit 10 Root hardening material 11 Bag body 12 Filling material 20 Restraint surface material 30 Stuffing material A Moat prevention structure B Structure B1 Base C Preceding moat
Claims (8)
前記拘束面材上に配列して前記拘束面材にロープの締結により固定した複数の根固め材と、を備え、
前記複数の根固め材はそれぞれ、編地からなる袋体と、前記袋体の内部に充填した中詰材を有し、
前記拘束面材の縁部の下部の地盤が洗堀されることで、下方に移動した前記根固め材の荷重と上方に残った前記根固め材の荷重によって、前記拘束面材を介して、前記拘束面材背面の地盤を拘束可能に構成したことを特徴とする、
洗堀防止ユニット。 Restraint surface material with flexibility that can follow the undulations of the ground,
A plurality of root hardening materials arranged on the restraint surface material and fixed to the restraint surface material by fastening a rope are provided.
Each of the plurality of root hardening materials has a bag body made of knitted fabric and a filling material filled inside the bag body.
By scouring the ground below the edge of the restraint surface material, the load of the root compactor moved downward and the load of the root compactor remaining above cause the restraint surface material to pass through. The ground on the back surface of the restraint surface material is configured to be restrainable.
Washing prevention unit.
前記基部と地盤の境界の少なくとも一部を覆うように配置した、請求項１乃至４のいずれか一項に記載の洗堀防止ユニットを備え、
前記拘束面材の縁部の下部が洗堀されることで、下方に移動した前記根固め材の荷重と上方に残った前記根固め材の荷重により、前記拘束面材を介して前記拘束面材背面の地盤を拘束可能に構成したことを特徴とする、
洗堀防止構造。 In a structure installed underwater, it is a scouring prevention structure that prevents scouring of the base by water flow.
The scouring prevention unit according to any one of claims 1 to 4, which is arranged so as to cover at least a part of the boundary between the base and the ground.
By scouring the lower part of the edge portion of the restraint surface material, the load of the root hardening material moved downward and the load of the root hardening material remaining above cause the restraint surface via the restraint surface material. The feature is that the ground on the back of the material can be restrained.
Washing prevention structure.
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| JP2001342630A (en) * | 2000-05-31 | 2001-12-14 | Shigeru Kuroda | Greening construction method for existing skeleton |
| JP2002097618A (en) * | 2000-09-26 | 2002-04-02 | Kankyo Kogaku Kk | Revetment structure, method of constructing revetment structure and stone for constructing revetment |
| JP2018155040A (en) * | 2017-03-17 | 2018-10-04 | 前田工繊株式会社 | Connection structure of structural body for civil engineering |
| WO2019155612A1 (en) * | 2018-02-09 | 2019-08-15 | 住友商事株式会社 | Erosion prevention unit and erosion prevention method |
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|---|---|---|---|---|
| JP2001342630A (en) * | 2000-05-31 | 2001-12-14 | Shigeru Kuroda | Greening construction method for existing skeleton |
| JP2002097618A (en) * | 2000-09-26 | 2002-04-02 | Kankyo Kogaku Kk | Revetment structure, method of constructing revetment structure and stone for constructing revetment |
| JP2018155040A (en) * | 2017-03-17 | 2018-10-04 | 前田工繊株式会社 | Connection structure of structural body for civil engineering |
| WO2019155612A1 (en) * | 2018-02-09 | 2019-08-15 | 住友商事株式会社 | Erosion prevention unit and erosion prevention method |
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