JP6951956B2 - Groyne - Google Patents

Groyne Download PDF

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JP6951956B2
JP6951956B2 JP2017235163A JP2017235163A JP6951956B2 JP 6951956 B2 JP6951956 B2 JP 6951956B2 JP 2017235163 A JP2017235163 A JP 2017235163A JP 2017235163 A JP2017235163 A JP 2017235163A JP 6951956 B2 JP6951956 B2 JP 6951956B2
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groyne
river
wall body
target area
water flow
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JP2019100146A (en
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勇司 前田
勇司 前田
前田　一成
一成 前田
康哲 青木
康哲 青木
剛 西畑
剛 西畑
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Penta Ocean Construction Co Ltd
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Description

本発明は、河川の水流を減勢する技術に関する。 The present invention relates to a technique for reducing the water flow of a river.

河川内で工事を行う際、河川の水流が速い程、工事に困難が伴う。 When constructing in a river, the faster the water flow in the river, the more difficult the construction will be.

上述した問題を解決するために、河川の工事を行う領域の水流を減勢させるための技術が提案されている。例えば、特許文献１には、水上構造物の基礎部の構築、維持、補修にあたって硬質地盤に支持層を貫入させた鋼管矢板壁板で基礎部を囲むことによって流水の影響から防護し、環境保全、景観向上を行うことが開示されている。 In order to solve the above-mentioned problems, a technique for reducing the water flow in the area where the river construction is carried out has been proposed. For example, in Patent Document 1, when constructing, maintaining, and repairing a foundation part of a water structure, the foundation part is surrounded by a steel pipe sheet pile wall plate in which a support layer is penetrated into a hard ground to protect the foundation part from the influence of running water and protect the environment. , It is disclosed that the landscape is improved.

特開２００６−３４２６１４号公報Japanese Unexamined Patent Publication No. 2006-342614

上述した特許文献１に記載の技術による場合、水流が減勢されるが、工事を行う領域の三方又は全周が鋼管矢板壁板により囲まれるため、領域に作業船が出入りすることができない。 In the case of the technique described in Patent Document 1 described above, the water flow is reduced, but the work boat cannot enter or leave the area because the three sides or the entire circumference of the area to be constructed are surrounded by the steel pipe sheet pile wall plate.

上記の事情に鑑み、本発明は、作業者が河川内における工事を容易に行うことを可能とする技術を提供する。 In view of the above circumstances, the present invention provides a technique that enables an operator to easily perform construction in a river.

上記の目的を達成するため、本発明は、河川の水流を減勢させたい対象領域の上流側に前記対象領域の水流を減勢するように配置された、下流に向かうに従い前記河川の左岸に近づく部分を有する第１の壁体と、前記第１の壁体と上流側において接し下流に向かうに従い前記河川の右岸に近づく部分を有する第２の壁体とを有する、前記対象領域の側方を覆わない第１の構造物と、前記対象領域の下流側に前記第１の構造物のみが配置された場合と比較し前記対象領域における水流をさらに減勢するように配置された、壁体を有する前記対象領域の側方を覆わない第２の構造物とを備える水制工を第１の態様として提案する。 In order to achieve the above object, the present invention is arranged on the upstream side of the target area where the water flow of the river is desired to be deenergized so as to reduce the water flow of the target area, and on the left bank of the river toward the downstream side. Lateral of the target area, having a first wall having an approaching portion and a second wall having a portion that is in contact with the first wall on the upstream side and approaches the right bank of the river as it goes downstream. A wall body arranged so as to further reduce the water flow in the target area as compared with the case where only the first structure that does not cover the target area and the first structure is arranged on the downstream side of the target area. A water control work including a second structure that does not cover the side of the target area is proposed as a first aspect.

上記の第１の態様に係る水制工によれば、第１の構造物と第２の構造物に挟まれた領域における水流が減勢される。また、第１の構造物と第２の構造物は分離されているため、第１の構造物と第２の構造物に挟まれた領域に対する作業船の出入りが容易である。従って、作業者は、第１の構造物と第２の構造物に挟まれた領域において工事を容易に行うことができる。 According to the groyne work according to the first aspect described above, the water flow in the region sandwiched between the first structure and the second structure is reduced. Further, since the first structure and the second structure are separated, it is easy for the work boat to enter and exit the area sandwiched between the first structure and the second structure. Therefore, the worker can easily carry out the construction in the area sandwiched between the first structure and the second structure.

また、上記の第１の態様に係る方法において、前記第１の壁体は、下流に向かうに従い前記河川の左岸に近づく部分の下流側において水流の方向と平行に延伸する部分を有し、前記第２の壁体は、下流に向かうに従い前記河川の右岸に近づく部分の下流側において水流の方向と平行に延伸する部分を有する、という構成が本発明の第２の態様として採用されてもよい。 Further, in the method according to the first aspect, the first wall body has a portion extending in parallel with the direction of the water flow on the downstream side of the portion approaching the left bank of the river as it goes downstream. A configuration in which the second wall body has a portion extending in parallel with the direction of the water flow on the downstream side of the portion approaching the right bank of the river toward the downstream side may be adopted as the second aspect of the present invention. ..

上記の第２の態様に係る水制工によれば、第１の壁体及び第２の壁体が有する水流の方向と平行に延伸する部分によって、第１の構造物と第２の構造物に挟まれた領域における水流がより効果的に減勢される。 According to the groyne work according to the second aspect described above, the first structure and the second structure are formed by the portions extending in parallel with the direction of the water flow of the first wall body and the second wall body. The water flow in the area sandwiched between the two is more effectively reduced.

また、上記の第１の態様又は第２の態様に係る水制工において、前記第２の構造物が有する壁体は、上流に向かうに従い前記河川の左岸に近づく部分を有する第３の壁体と、前記第３の壁体と下流側において接し上流に向かうに従い前記河川の右岸に近づく部分を有する第４の壁体とを有する、という構成が本発明の第３の態様として採用されてもよい。 Further, in the groyne according to the first aspect or the second aspect, the wall body of the second structure is a third wall body having a portion closer to the left bank of the river as it goes upstream. And, even if the configuration of having the third wall body and the fourth wall body having a portion that comes into contact with the third wall body on the downstream side and approaches the right bank of the river as it goes upstream is adopted as the third aspect of the present invention. good.

上記の第３の態様に係る水制工によれば、工事を行う領域が河口付近であり、下流側から上流側へ水が逆流した場合であっても、第１の構造物と第２の構造物に挟まれた領域における水流が減勢される。 According to the groyne work according to the third aspect described above, even if the area to be constructed is near the river mouth and water flows backward from the downstream side to the upstream side, the first structure and the second structure Water flow in the area between the structures is diminished.

また、上記の第３の態様に係る水制工において、前記第３の壁体は、上流に向かうに従い前記河川の左岸に近づく部分の上流側において水流の方向と平行に延伸する部分を有し、前記第４の壁体は、下流に向かうに従い前記河川の右岸に近づく部分の上流側において水流の方向と平行に延伸する部分を有する、という構成が本発明の第４の態様として採用されてもよい。 Further, in the groyne work according to the third aspect, the third wall body has a portion extending in parallel with the direction of the water flow on the upstream side of the portion approaching the left bank of the river toward the upstream. As the fourth aspect of the present invention, the fourth wall body has a portion extending in parallel with the direction of the water flow on the upstream side of the portion approaching the right bank of the river as it goes downstream. May be good.

上記の第４の態様に係る水制工によれば、水が逆流した場合であっても、第３の壁体及び第４の壁体が有する水流の方向と平行に延伸する部分によって、第１の構造物と第２の構造物に挟まれた領域における水流がより効果的に減勢される。 According to the groyne according to the fourth aspect described above, even when water flows backward, the portion extending in parallel with the direction of the water flow of the third wall body and the fourth wall body makes the third wall body and the fourth wall body. The water flow in the region sandwiched between the first structure and the second structure is more effectively dampened.

本発明によれば、作業者は河川内において工事を容易に行うことができる。 According to the present invention, a worker can easily carry out construction work in a river.

一実施形態に係る水制工の平面図。A plan view of a groyne according to an embodiment. 一実施形態に係る水制工の側面図。A side view of a groyne according to an embodiment. 一実施形態に係る水制工を構成する鋼管矢板の平面図。A plan view of a steel pipe sheet pile constituting a groyne according to an embodiment. 比較例に係る水制工の平面図。Top view of the groyne according to the comparative example. 比較例に係る水制工が配置された河川の流速分布図。Flow velocity distribution map of the river where the groyne according to the comparative example is arranged. 比較例に係る水制工の平面図。Top view of the groyne according to the comparative example. 比較例に係る水制工が配置された河川の流速分布図。Flow velocity distribution map of the river where the groyne according to the comparative example is arranged. 比較例に係る水制工の平面図。Top view of the groyne according to the comparative example. 比較例に係る水制工が配置された河川の流速分布図。Flow velocity distribution map of the river where the groyne according to the comparative example is arranged. 一実施形態に係る水制工が配置された河川の流速分布図。A flow velocity distribution map of a river in which a groyne according to an embodiment is arranged. 一実施形態に係る水制工が配置された河川の流速分布図。A flow velocity distribution map of a river in which a groyne according to an embodiment is arranged. 一実施形態に係る水制工が配置された河川の流速分布図。A flow velocity distribution map of a river in which a groyne according to an embodiment is arranged. 一実施形態に係る水制工が配置された河川の流速分布図。A flow velocity distribution map of a river in which a groyne according to an embodiment is arranged. 一変形例に係る水制工の平面図。A plan view of a groyne according to a modified example. 一変形例に係る水制工が配置された河川の流速分布図。Flow velocity distribution map of the river where the groyne related to the modified example is arranged. 一変形例に係る水制工の平面図。A plan view of a groyne according to a modified example. 一変形例に係る水制工が配置された河川の流速分布図。Flow velocity distribution map of the river where the groyne related to the modified example is arranged. 一変形例に係る水制工の平面図。A plan view of a groyne according to a modified example. 一変形例に係る水制工が配置された河川の流速分布図。Flow velocity distribution map of the river where the groyne related to the modified example is arranged.

［実施形態］
以下に本発明の一実施形態に係る水制工１を説明する。図１は、河川Ｒの対象領域Ｓにおける水流を減勢するために配置された水制工１の平面図であり、図２は水制工１の側面図である。なお、図１及び図２には、対象領域Ｓ内に配置された工作物１００も併せて記載されている。 [Embodiment]
The groyne 1 according to the embodiment of the present invention will be described below. FIG. 1 is a plan view of the groyne 1 arranged for energizing the water flow in the target area S of the river R, and FIG. 2 is a side view of the groyne 1. In addition, in FIG. 1 and FIG. 2, the workpiece 100 arranged in the target area S is also described.

図１において、河川Ｒは左岸ＢＬと右岸ＢＲの間を矢印Ａの方向に流れている。すなわち、図１の右側が河川Ｒの上流側、左側が河川Ｒの下流側となる。 In FIG. 1, the river R flows between the left bank BL and the right bank BR in the direction of arrow A. That is, the right side of FIG. 1 is the upstream side of the river R, and the left side is the downstream side of the river R.

対象領域Ｓは、例えば工作物１００の新設工事、又は、既設の工作物１００の補修工事を行うために、河川Ｒの水流を減勢させたい領域である。なお、工作物１００の形状は図１に示した形状に限られない。 The target area S is an area in which the water flow of the river R is desired to be reduced in order to perform, for example, new construction work of the work piece 100 or repair work of the existing work piece 100. The shape of the workpiece 100 is not limited to the shape shown in FIG.

水制工１は対象領域Ｓの上流側に配置された壁体である第１の構造物１１と、対象領域Ｓの下流側に第１の構造物１１から分離されて配置された壁体である第２の構造物１２を備える。 The groyne 1 is a first structure 11 which is a wall body arranged on the upstream side of the target area S and a wall body separated from the first structure 11 on the downstream side of the target area S. A second structure 12 is provided.

第１の構造物１１は、左岸ＢＬ側に配置された第１の壁体１１１と、右岸ＢＲ側に配置され、第１の壁体１１１と上流側において接する第２の壁体１１２を有する。 The first structure 11 has a first wall body 111 arranged on the left bank BL side and a second wall body 112 arranged on the right bank BR side and in contact with the first wall body 111 on the upstream side.

第１の壁体１１１は、下流に向かうに従い左岸ＢＬに近づく上流側部分１１１１と、上流側部分１１１１の下流側において水流の方向と平行に延伸する下流側部分１１１２を有する。 The first wall body 111 has an upstream side portion 1111 that approaches the left bank BL as it goes downstream, and a downstream side portion 1112 that extends parallel to the direction of the water flow on the downstream side of the upstream side portion 1111.

第２の壁体１１２は、下流に向かうに従い右岸ＢＲに近づく上流側部分１１２１と、上流側部分１１２１の下流側において水流の方向と平行に延伸する下流側部分１１２２を有する。 The second wall 112 has an upstream portion 1121 that approaches the right bank BR as it goes downstream, and a downstream portion 1122 that extends parallel to the direction of the water flow on the downstream side of the upstream portion 1121.

第２の構造物１２は、左岸ＢＬ側に配置された第３の壁体１２１と、右岸ＢＲ側に配置され、第３の壁体１２１と下流側において接する第４の壁体１２２を有する。 The second structure 12 has a third wall body 121 arranged on the left bank BL side and a fourth wall body 122 arranged on the right bank BR side and in contact with the third wall body 121 on the downstream side.

第３の壁体１２１は、上流に向かうに従い左岸ＢＬに近づく下流側部分１２１１と、下流側部分１２１１の上流側において水流の方向と平行に延伸する上流側部分１２１２を有する。 The third wall 121 has a downstream portion 1211 that approaches the left bank BL as it goes upstream, and an upstream portion 1212 that extends parallel to the direction of the water flow on the upstream side of the downstream portion 1211.

第４の壁体１２２は、上流に向かうに従い右岸ＢＲに近づく下流側部分１２２１と、下流側部分１２２１の上流側において水流の方向と平行に延伸する上流側部分１２２２を有する。 The fourth wall body 122 has a downstream side portion 1221 that approaches the right bank BR toward the upstream side, and an upstream side portion 1222 that extends parallel to the direction of the water flow on the upstream side of the downstream side portion 1221.

水制工１は複数本の鋼管矢板を、図１に示される平面形状を描くように整列配置したものである。図２に示されるように、水制工１の上端は河川Ｒの最高水位ＬＨより高く、水制工１の下端は地盤Ｇに打設されている。 The groyne 1 is formed by arranging a plurality of steel pipe sheet piles in an aligned manner so as to draw a planar shape shown in FIG. As shown in FIG. 2, the upper end of the groyne 1 is higher than the maximum water level LH of the river R, and the lower end of the groyne 1 is driven into the ground G.

図３は、水制工１を構成する鋼管矢板９の平面図である。鋼管矢板９は、鋼管本体９１と、鋼管本体９１の外周面上の互いに対向する位置に取り付けられた継手９２及び継手９３を有する。継手９２は軸に平行な方向に延伸する開口部９２１を有する管体である。また、継手９３は軸に平行な方向に延伸する開口部９３１を有する管体である。継手９２及び継手９３の水平断面形状はＣ字を示す。鋼管矢板９の継手９２及び継手９３は、隣接する他の鋼管矢板９の継手９２又は継手９３と連結される。 FIG. 3 is a plan view of the steel pipe sheet pile 9 constituting the groyne 1. The steel pipe sheet pile 9 has a steel pipe main body 91, and a joint 92 and a joint 93 attached at positions facing each other on the outer peripheral surface of the steel pipe main body 91. The joint 92 is a pipe body having an opening 921 extending in a direction parallel to the axis. Further, the joint 93 is a pipe body having an opening 931 extending in a direction parallel to the axis. The horizontal cross-sectional shapes of the joint 92 and the joint 93 show a C shape. The joint 92 and the joint 93 of the steel pipe sheet pile 9 are connected to the joint 92 or the joint 93 of another adjacent steel pipe sheet pile 9.

以下に、図１に示した平面形状の水制工１が効果的に対象領域Ｓにおける水流を減勢することを、シミュレーションモデルの解析結果を用いて説明する。 Below, it will be described using the analysis result of the simulation model that the planar groyne 1 shown in FIG. 1 effectively reduces the water flow in the target region S.

図４は、水制工１が備える第１の構造物１１の水流の減勢効果を確認するための比較例に係る水制工７の平面図である。水制工７は、対象領域Ｓの上流側に、平面形状が水流の方向と垂直な方向に延伸する一文字である壁体の構造物を備え、対象領域Ｓの下流側には構造物を備えない。 FIG. 4 is a plan view of the groyne 7 according to a comparative example for confirming the effect of energizing the water flow of the first structure 11 included in the groyne 1. The groyne 7 is provided with a wall structure having a planar shape extending in a direction perpendicular to the direction of the water flow on the upstream side of the target area S, and a structure on the downstream side of the target area S. No.

図５は、水制工７が配置された河川の流速分布図である。図５及び以下の説明で参照する図７、図９、図１０〜図１３、図１５、図１７、図１９において、横軸は河川の流れ方向の位置を示し、縦軸は河川の幅方向の位置を示し、色が白に近い程、その領域の水流が減勢されていることを示す。なお、水流の方向は右から左へ向かう方向であり、流速は３ｍ／ｓが設定されている。 FIG. 5 is a flow velocity distribution map of the river in which the groyne 7 is arranged. In FIGS. 7, 9, 9, 10, 15, 15, 17, and 19, which are referred to in FIGS. 5 and 5, the horizontal axis indicates the position in the flow direction of the river, and the vertical axis indicates the width direction of the river. The closer the color is to white, the less the water flow in that area. The direction of the water flow is from right to left, and the flow velocity is set to 3 m / s.

図６は、他の比較例に係る水制工８の平面図である。水制工８は、対象領域Ｓの上流側に配置された、下流に向かうに従い左岸に近づく壁体８１と、壁体８１と上流側で接し下流に向かうに従い右岸に近づく壁体８２を備える。図７は、水制工８が配置された河川の流速分布図である。図７は、水制工８の減勢効果が水制工７より高いことを示している。 FIG. 6 is a plan view of the groyne 8 according to another comparative example. The groyne 8 includes a wall body 81 arranged on the upstream side of the target area S and approaching the left bank as it goes downstream, and a wall body 82 that comes into contact with the wall body 81 on the upstream side and approaches the right bank as it goes downstream. FIG. 7 is a flow velocity distribution map of the river in which the groyne 8 is arranged. FIG. 7 shows that the effect of reducing the energy of the groyne 8 is higher than that of the groyne 7.

図８は、他の比較例に係る水制工１０の平面図である。水制工１０は、対象領域Ｓの上流側に配置された、水制工１が備える第１の構造物１１と同じ形状の壁体を備える。図９は、水制工１０が配置された河川の流速分布図である。図９は、水制工１０の減勢効果が水制工８より高いことを示している。 FIG. 8 is a plan view of the groyne 10 according to another comparative example. The groyne 10 includes a wall body arranged on the upstream side of the target area S and having the same shape as the first structure 11 included in the groyne 1. FIG. 9 is a flow velocity distribution map of the river in which the groyne 10 is arranged. FIG. 9 shows that the effect of reducing the energy of the groyne 10 is higher than that of the groyne 8.

図１０は、本実施形態に係る水制工１が配置された河川の流速分布図である。図１０は、水制工１の減勢効果が水制工１０より高いことを示している。すなわち、対象領域Ｓの上流側に壁体を配置するとともに、対象領域Ｓの下流側にも壁体を配置することで、対象領域Ｓにおける水流の減勢効果が高まることが分かる。 FIG. 10 is a flow velocity distribution map of the river in which the groyne 1 according to the present embodiment is arranged. FIG. 10 shows that the effect of reducing the energy of the groyne 1 is higher than that of the groyne 10. That is, it can be seen that by arranging the wall body on the upstream side of the target area S and arranging the wall body on the downstream side of the target area S, the effect of reducing the energy flow in the target area S is enhanced.

図１１〜図１３は、水制工１の第１の構造物１１と第２の構造物１２の距離を変化させた場合に、対象領域Ｓにおける水流の減勢効果がどのように変化するかを確認するために行ったシミュレーションモデルの解析結果を示している。図１０〜図１３の流速分布図から、第１の構造物１１と第２の構造物１２の距離を、第１の構造物１１又は第２の構造物１２の幅方向の長さの２倍以上に広げても、対象領域Ｓにおける水流は十分に減勢されることが分かる。 11 to 13 show how the effect of energizing the water flow in the target area S changes when the distance between the first structure 11 and the second structure 12 of the groyne 1 is changed. The analysis result of the simulation model performed to confirm is shown. From the flow velocity distribution diagram of FIGS. 10 to 13, the distance between the first structure 11 and the second structure 12 is twice the length in the width direction of the first structure 11 or the second structure 12. It can be seen that the water flow in the target area S is sufficiently reduced even if it is expanded as described above.

上述した水制工１によれば、対象領域Ｓにおける水流が十分に減勢される。その結果、作業員は対象領域Ｓにおいて容易に工事を行うことができる。また、水制工１は対象領域Ｓの側方を覆わず、対象領域Ｓの上流側及び下流側にも広いスペースを確保するため、作業船が対象領域Ｓに出入りする妨げとならない。 According to the above-mentioned groyne 1, the water flow in the target area S is sufficiently reduced. As a result, the worker can easily carry out the construction in the target area S. Further, since the groyne 1 does not cover the side of the target area S and secures a wide space on the upstream side and the downstream side of the target area S, it does not hinder the work boat from entering and exiting the target area S.

また、上述した水制工１が備える第２の構造物１２は下流から上流に向かい河川の幅方向に拡がる形状の壁体である。そのため、例えば対象領域Ｓが河川Ｒの河口付近であり、潮流が卓越して水の流向が逆転する時間帯があっても、対象領域Ｓにおける水流の減勢効果が損なわれることがない。 Further, the second structure 12 included in the above-mentioned groyne 1 is a wall body having a shape extending from the downstream to the upstream in the width direction of the river. Therefore, for example, even if the target area S is near the mouth of the river R and there is a time zone in which the tidal current is predominant and the water flow direction is reversed, the effect of energizing the water flow in the target area S is not impaired.

［変形例］
上述の実施形態は本発明の一具体例であって、本発明の技術的思想の範囲内において様々に変形可能である。以下にそれらの変形の例を示す。 [Modification example]
The above-described embodiment is a specific example of the present invention, and can be variously modified within the scope of the technical idea of the present invention. Examples of these modifications are shown below.

対象領域Ｓの下流側に配置される壁体の平面形状は、図１に示したものに限られない。 The planar shape of the wall body arranged on the downstream side of the target area S is not limited to that shown in FIG.

図１４は、水制工１の第２の構造物１２に代えて、対象領域Ｓの下流側に平面形状が一文字である第２の構造物２２を備える水制工２の平面図である。図１５は、水制工２が配置された河川の流速分布図である。 FIG. 14 is a plan view of the groyne 2 including the second structure 22 having a one-letter planar shape on the downstream side of the target area S instead of the second structure 12 of the groyne 1. FIG. 15 is a flow velocity distribution map of the river in which the groyne 2 is arranged.

図１６は、水制工１の第２の構造物１２に代えて、対象領域Ｓの下流側に平面形状が「コ」の字である第２の構造物３２を備える水制工３の平面図である。図１７は、水制工３が配置された河川の流速分布図である。 FIG. 16 shows a plane of the groyne 3 having a second structure 32 having a “U” shape on the downstream side of the target area S instead of the second structure 12 of the groyne 1. It is a figure. FIG. 17 is a flow velocity distribution map of the river in which the groyne 3 is arranged.

図９と図１５及び図１７を比較すると明らかなように、対象領域Ｓの下流側に配置される壁体の平面形状が異なっても、下流側に壁体を配置しない場合と比較して、対象領域Ｓにおける水流の減勢効果が高まる。 As is clear from comparing FIG. 9 with FIGS. 15 and 17, even if the plan shape of the wall body arranged on the downstream side of the target area S is different, the case where the wall body is not arranged on the downstream side is compared with the case where the wall body is not arranged on the downstream side. The effect of reducing the water flow in the target area S is enhanced.

対象領域Ｓの上流側に配置される壁体の平面形状は、図１に示したものに限られない。 The planar shape of the wall body arranged on the upstream side of the target area S is not limited to that shown in FIG.

図１８は、水制工１の第１の構造物１１に代えて、対象領域Ｓの上流側に平面形状が「Ｖ」字である第１の構造物４１を備え、対象領域Ｓの下流側に平面形状が「Ｖ」字である第２の構造物４２を備える水制工４の平面図である。図１９は、水制工４が配置された河川の流速分布図である。 In FIG. 18, instead of the first structure 11 of the groyne 1, a first structure 41 having a “V” -shaped plane shape is provided on the upstream side of the target area S, and the downstream side of the target area S. It is a plan view of a groyne 4 including a second structure 42 having a plane shape of "V". FIG. 19 is a flow velocity distribution map of the river in which the groyne 4 is arranged.

図７と図１９を比較すると明らかなように、対象領域Ｓの上流側に配置される壁体の平面形状が異なっても、下流側に壁体を配置することによって、対象領域Ｓにおける水流の減勢効果が高まる。 As is clear from a comparison between FIGS. 7 and 19, even if the plan shape of the wall body arranged on the upstream side of the target area S is different, by arranging the wall body on the downstream side, the water flow in the target area S can be changed. The effect of reducing energy is enhanced.

水制工を構成する壁体は鋼管矢板に限られない。例えばハット型鋼矢板、Ｕ形鋼矢板等の他の形状の矢板により本発明に係る水制工が構成されてもよい。また、一定間隔に打設されたＨ形鋼等の親杭の間に横矢板を挿入して形成される壁体により本発明に係る水制工が構成されてもよい。また、一定間隔で打設した杭に予め作製した壁体を嵌め込んで形成されるジャケット式の壁体により本発明に係る水制工が構成されてもよい。 The walls that make up the groyne are not limited to steel pipe sheet piles. For example, the groyne according to the present invention may be composed of sheet piles of other shapes such as a hat-shaped steel sheet pile and a U-shaped steel sheet pile. Further, the groyne according to the present invention may be configured by a wall body formed by inserting a horizontal sheet pile between parent piles of H-shaped steel or the like placed at regular intervals. Further, the groyne according to the present invention may be configured by a jacket-type wall body formed by fitting a wall body prepared in advance into piles cast at regular intervals.

１…水制工、２…水制工、３…水制工、４…水制工、７…水制工、８…水制工、９…鋼管矢板、１０…水制工、１１…第１の構造物、１２…第２の構造物、２２…第２の構造物、３２…第２の構造物、４１…第１の構造物、４２…第２の構造物、８１…壁体、８２…壁体、９１…鋼管本体、９２…継手、９３…継手、１００…工作物、１１１…第１の壁体、１１２…第２の壁体、１２１…第３の壁体、１２２…第４の壁体、９２１…開口部、９３１…開口部。 1 ... Water control work, 2 ... Water control work, 3 ... Water control work, 4 ... Water control work, 7 ... Water control work, 8 ... Water control work, 9 ... Steel pipe sheet pile, 10 ... Water control work, 11 ... No. 1 structure, 12 ... second structure, 22 ... second structure, 32 ... second structure, 41 ... first structure, 42 ... second structure, 81 ... wall body, 82 ... wall body, 91 ... steel pipe body, 92 ... joint, 93 ... joint, 100 ... workpiece, 111 ... first wall body, 112 ... second wall body, 121 ... third wall body, 122 ... second 4 wall bodies, 921 ... openings, 931 ... openings.

Claims (4)

河川の水流を減勢させたい対象領域の上流側に前記対象領域の水流を減勢するように配置された、下流に向かうに従い前記河川の左岸に近づく部分を有する第１の壁体と、前記第１の壁体と上流側において接し下流に向かうに従い前記河川の右岸に近づく部分を有する第２の壁体とを有する、前記対象領域の側方を覆わない第１の構造物と、
前記対象領域の下流側に前記第１の構造物のみが配置された場合と比較し前記対象領域における水流をさらに減勢するように配置された、壁体を有する前記対象領域の側方を覆わない第２の構造物と
を備える水制工。 A first wall body having a portion closer to the left bank of the river as it goes downstream, which is arranged so as to reduce the water flow of the target area on the upstream side of the target area where the water flow of the river is to be deenergized, and the said A first structure that does not cover the side of the target area and has a second wall that is in contact with the first wall on the upstream side and has a portion that approaches the right bank of the river as it goes downstream.
Covers the side of the target area having a wall body arranged so as to further reduce the water flow in the target area as compared with the case where only the first structure is arranged on the downstream side of the target area. A groyne with no second structure. 前記第１の壁体は、下流に向かうに従い前記河川の左岸に近づく部分の下流側において水流の方向と平行に延伸する部分を有し、
前記第２の壁体は、下流に向かうに従い前記河川の右岸に近づく部分の下流側において水流の方向と平行に延伸する部分を有する
請求項１に記載の水制工。 The first wall body has a portion extending in parallel with the direction of the water flow on the downstream side of the portion approaching the left bank of the river as it goes downstream.
The groyne according to claim 1, wherein the second wall body has a portion extending in parallel with the direction of the water flow on the downstream side of the portion approaching the right bank of the river as it goes downstream. 前記第２の構造物が有する壁体は、上流に向かうに従い前記河川の左岸に近づく部分を有する第３の壁体と、前記第３の壁体と下流側において接し上流に向かうに従い前記河川の右岸に近づく部分を有する第４の壁体とを有する
請求項１又は２に記載の水制工。 The wall body of the second structure is in contact with the third wall body having a portion approaching the left bank of the river as it goes upstream, and is in contact with the third wall body on the downstream side, and of the river as it goes upstream. The groyne according to claim 1 or 2, which has a fourth wall having a portion approaching the right bank. 前記第３の壁体は、上流に向かうに従い前記河川の左岸に近づく部分の上流側において水流の方向と平行に延伸する部分を有し、
前記第４の壁体は、下流に向かうに従い前記河川の右岸に近づく部分の上流側において水流の方向と平行に延伸する部分を有する
請求項３に記載の水制工。 The third wall body has a portion extending parallel to the direction of the water flow on the upstream side of the portion approaching the left bank of the river toward the upstream.
The groyne according to claim 3, wherein the fourth wall has a portion extending in parallel with the direction of the water flow on the upstream side of the portion approaching the right bank of the river toward the downstream.
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