JP5518795B2 - Floor stopper - Google Patents

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JP5518795B2
JP5518795B2 JP2011140740A JP2011140740A JP5518795B2 JP 5518795 B2 JP5518795 B2 JP 5518795B2 JP 2011140740 A JP2011140740 A JP 2011140740A JP 2011140740 A JP2011140740 A JP 2011140740A JP 5518795 B2 JP5518795 B2 JP 5518795B2
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fishway
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和男 工藤
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本発明は、河川改修により、魚道を構築するための根固め工と遮水板による床止め工法に関する。   The present invention relates to a root fixing method for constructing a fishway by river improvement and a flooring method using a water shielding plate.

洪水等による河川災害などで河床低下が生じた場合、河川横断構造物(帯工等)下流や自然河床部に落差が生じるため、河川改修により落差部に床止め工や魚道が設置される。   When a riverbed is lowered due to a river disaster caused by flooding, etc., a drop occurs in the downstream part of the river crossing structure (such as a beltwork) or in the natural riverbed.

例えば、深い沼区間と瀬区間とを繰り返して施工し、水中生物が自由に上流及び下流に移動できるように様々な棲息環境を造成し、食物連鎖による河川の健康な生態系を造成する河川の水中生態系復元工法が知られている（特許文献１を参照）。
この公知技術は、河川底と同じ高さに設けられる上流及び下流遮断壁と、それらの上流及び下流遮断壁の間で所定の深さに浚渫される貯水部とから構成される沼区間を複数設け、その沼区間の間に瀬区間を設けることにより、水中生態系復元の基本環境を造成し、その基本環境から河川の水中生態系を復元できるようにしたものである。 For example, by constructing a deep marsh section and a sewer section repeatedly, creating various habitats so that aquatic organisms can move freely upstream and downstream, and creating a healthy ecosystem for rivers by the food chain An underwater ecosystem restoration method is known (see Patent Document 1).
This known technique has a plurality of swamp sections composed of upstream and downstream barrier walls provided at the same height as the river bottom, and a water storage section drowned at a predetermined depth between the upstream and downstream barrier walls. Establishing a base section between the swamp sections to create a basic environment for restoring the underwater ecosystem, and to restore the river's underwater ecosystem from that basic environment.

一方、取水のための落差工に組み合わせた魚類に優しい魚道をどのように構築するかを解決した魚道を組み合わせた河川表流水取水工法が知られている（特許文献２を参照）。
この公知技術は、河川の左右両河岸部に構築した護岸基礎間に、コンクリートに粗石を一部が表面に露出した状態に埋め込み、河川を横断して形成した落差工の上流側に、該落差工と一体的に同じくコンクリートの粗石を一部が表面に露出した状態に埋め込んだ水叩き工を形成し、該水叩き工と落差工とにわたる表流水取水のための保水を目的とする流れ方向の導水路を、上記水叩き工より低床かつ上記落差工で縮幅して形成し、上記落差工の直下流に、松杭と松丸太を組み合わせ粗石で間詰めを行って、上記導水路の直下流が深く両河岸方向に漸次浅くし、かつ緩やかな流れ勾配を持たせて、上記導水路に続く凹溝状の川筋を形成し、該川筋を魚道の遡上が容易な魚道としたものである。 On the other hand, there is known a river surface water intake method that combines a fishway that solves how to construct a fishway that is friendly to fish that is combined with a drop for water intake (see Patent Document 2).
This known technique embeds rough stone in concrete with a part exposed on the surface between the revetment foundations constructed on the left and right riverbanks, and on the upstream side of the drop work formed across the river. A water tapping work in which the rough stone of concrete is embedded in a state where a part of the rough stone is exposed on the surface is formed in the same manner as the heading work, and the purpose is water retention for surface water intake across the water tapping work and the heading work. The waterway in the flow direction is formed with a floor that is lower than the water tapping work and reduced in width by the drop work, and pine piles and pine logs are combined with the rough stone immediately downstream of the drop work, The downstream of the waterway is deeper and shallower in both riverbanks and has a gentle flow gradient to form a grooved river line that follows the waterway. It is a fishway.

この魚道を組み合わせた河川表流水取水工法は、導水路の直下流に魚道を形成し、河床全面に粗石が敷き詰められているため、河床部の流れは粗石と粗石の間を紆余曲折して変化し、また導水路内も側壁が粗石により出入しているため流れが変化して魚類の通過が容易となり、粗石同士の間は魚巣とも成り得るものである。
これに対して、床止め工と魚道を容易且つ安価に設置可能とすること及び不定形な河道断面に対しても床止め工と魚道を設置可能とすることが望まれていた。 The river surface water intake method combined with this fishway forms a fishway directly downstream of the waterway, and the entire riverbed is covered with rough stones, so the flow in the riverbed part turns between the rough stones and the rough stones. In addition, since the side walls of the conduits are made of coarse stones, the flow changes and the passage of fish becomes easy, and the coarse stones can also be fish nests.
On the other hand, it has been desired that the floor stopper and the fishway can be easily and inexpensively installed, and that the floor stopper and the fishway can be installed even for an irregular river channel cross section.

特開２００６−１４４５３９号公報JP 2006-144539 A 特許第２５６７３４２号公報(図６〜１０を参照)Japanese Patent No. 2567342 (see FIGS. 6 to 10)

しかしながら、従来技術では、コンクリート等の強固な床止め工及び魚道を設置してきたが、その設置に伴い用地の拡幅、堤防の開削、多大な工事費、長い工事期間が必要であった。
本発明は、斯かる問題点に鑑みてなされたものであり、洪水等による河川災害などで河床低下が生じた場合、上記課題を解決できる、河川改修により落差部に床止め工や魚道を構築するための根固め工と遮水板による床止め工法を提供することを目的とする。 However, in the prior art, a strong floor stopper such as concrete and a fishway have been installed, but with the installation, widening of the site, excavation of the levee, a great amount of construction cost, and a long construction period were required.
The present invention has been made in view of such problems, and in the event that a river bed is lowered due to a river disaster caused by flooding or the like, the above problems can be solved, and a floor stopper or a fishway is constructed at the head of the head by renovation of the river. The purpose is to provide a floor-fixing method using a root-hardening work and a water shielding board.

請求項１に係る発明は、川底に敷設された遮水シートと、
根固め工と、
川底に打設された遮水板とを備え、
前記遮水板には魚が通過可能な切欠き部が設けられ、
前記遮水板に接する下流側の根固め工は、さらに下流側の根固め工よりも低く配置されることによりプールが形成されていることを特徴とする請求項２に記載の床止め工である。
請求項２に係る発明は、
前記根固め工により前記遮水板の川幅方向端部が固定されていることを特徴とする請求項１に記載の床止め工である。 Invention includes a water shield sheet which has been laid on the river bottom according to claim 1,
Root-setting work,
With a water shielding plate placed at the bottom of the river,
The water shielding plate is provided with a notch through which fish can pass ,
The floor fixing work according to claim 2, wherein a pool is formed by disposing the downstream root- setting work in contact with the water shielding plate to be lower than the downstream root- setting work. is there.
The invention according to claim 2
2. The floor stopper according to claim 1 , wherein an end portion of the water shielding plate in the river width direction is fixed by the rooting work.

本発明の魚道を構築するための根固め工と遮水板による床止め工法は、根固め工及び遮水板を用いるので非常に安価に構築できる。また、用地の拡幅、堤防の開削等が不要になるので、その結果、従来技術に比べて安価で、工期が短くすることが出来る。さらに、根固め工の位置・段数を変え、遮水板の形状を買えることにより、不定形な河道断面に対しても施工することが出来る。   The floor fixing method using a root-setting work and a water shielding plate for constructing the fishway of the present invention can be constructed at a very low cost because it uses a root-setting method and a water shielding plate. In addition, since widening of the site, excavation of the dike and the like are unnecessary, as a result, it is cheaper than the prior art and the construction period can be shortened. Furthermore, by changing the position and the number of steps of the root hardening work and buying the shape of the water shielding plate, it is possible to construct even an irregular river channel cross section.

本発明の魚道を構築するための根固め工と遮水板による床止め工法の平面図である。It is a top view of the floor stop construction method by the rooting work for constructing the fishway of this invention, and a water shielding board. 本発明の魚道を構築するための根固め工と遮水板による床止め工法の縦断図である。It is a longitudinal cross-sectional view of the floor-stopping method by the rooting work and the water shielding board for constructing the fishway of the present invention. 図１の矢視Ａ−Ａ断面図である。It is arrow AA sectional drawing of FIG. 図１の矢視Ｂ−Ｂ断面図である。It is arrow BB sectional drawing of FIG. 図１の矢視Ｃ−Ｃ断面図である。It is CC sectional view taken on the line of FIG. 図１の矢視Ｄ−Ｄ断面図である。It is arrow DD sectional drawing of FIG. 図１の矢視Ｅ−Ｅ断面図である。It is arrow EE sectional drawing of FIG. 図１の矢視Ｆ−Ｆ断面図である。It is arrow FF sectional drawing of FIG. 図１の矢視Ｇ−Ｇ断面図である。It is arrow GG sectional drawing of FIG. 図１の矢視Ｈ−Ｈ断面図である。It is arrow HH sectional drawing of FIG. 本発明の魚道を構築するための根固め工と遮水板による床止め工法の斜視図である。It is a perspective view of the floor-stopping method by the rooting work and the water shielding board for constructing the fishway of the present invention. 図1に係る遮水板の正面図である。FIG. 2 is a front view of a water shielding plate according to FIG.

本発明の魚道を構築するための根固め工と遮水板による床止め工法の一実施例を添付図面に基づいて、以下に説明する。
図１の平面図、図２の縦断図に示すように、本発明の魚道を構築するための根固め工と遮水板による床止め工法は、根固め工の袋詰め石工１の段積み及び板柵土留め（遮水板）２の遮水工により床止め工を構築し、遮水板２の切欠き部により魚道を形成し、遮水シート３により伏流を防止すると共に、根固め工の袋詰め石工１の配置により魚道としての通路４およびプール（深い淵）５を設ける。すなわち、袋詰め石工１を段数を下流部分よりも小さくすることにより（図２では、下流部分が２段で、プールでは１段）プール５を形成している。 One example of a floor-stopping method using a rooting work and a water shielding plate for constructing a fishway of the present invention will be described below with reference to the accompanying drawings.
As shown in the plan view of FIG. 1 and the longitudinal cross-sectional view of FIG. 2, the rooting work and the floor-stopping method using a water shielding plate for constructing the fishway of the present invention are as follows: The floor fence is constructed by the impervious work of the plate fence earth retaining (impervious sheet) 2, the fishway is formed by the notch of the impervious sheet 2, the underwater flow is prevented by the impermeable sheet 3, and the rooting work The passage 4 and the pool (deep coral) 5 as a fishway are provided by the arrangement of the bag masonry 1. That is, the pooling masonry 1 is formed by making the number of steps smaller than the downstream portion (in FIG. 2, the downstream portion has two steps and the pool has one step).

前記根固め工としては、主として袋詰め石工１を用いるが、カゴ工、コンクリートブロックであっても良い。
前記遮水工としては、図１２に示すように、プラ擬木、板柵土留め２を用いた遮水板は、鋼材の支柱を河底に打設して安定を確保し、前記支柱に木材や樹脂による板を組み合わせたものである。また、図１に示すように袋詰め石工１により遮水板の川幅方向端部が固定されている。遮水板の厚さは流量などにより、長さは川幅により計算され定められる。本実施例に係る遮水板は、中央部分と左右部分が別体となっている。中央部分の高さが左右部分よりも低いため、切欠き部６が形成されることとなっている。
また、魚道を形成するための遮水板の切欠き部６の切断形状は、河川流量および対象魚に対応した自由な形状の設置が可能である。
根固め工としては、遮水板の前面および根固め工下部には遮水シート３を設置する。
また、必要により管渠により潜孔を設ける。 As the root hardening work, the bagging masonry 1 is mainly used, but a basket work or a concrete block may be used.
As shown in FIG. 12, the water shielding plate using the plastic pseudo-tree and the plate fence retaining ring 2 is constructed by placing a steel column on the riverbed to ensure stability. It is a combination of plastic plates. Moreover, as shown in FIG. 1, the river width direction edge part of the water shielding board is being fixed by the bagging masonry 1. The thickness of the water shielding plate is calculated and determined by the flow rate and the length by the river width. In the water shielding plate according to the present embodiment, the central portion and the left and right portions are separated. Since the height of the central portion is lower than the left and right portions, the cutout portion 6 is formed.
Moreover, the cut shape of the notch 6 of the water shielding board for forming a fishway can be installed in a free shape corresponding to the river flow rate and the target fish.
As a rooting work, a water shielding sheet 3 is installed on the front surface of the water shielding plate and on the lower part of the root hardening work.
Further, if necessary, a latent hole is provided by a pipe rod.

本発明の魚道を構築するための根固め工と遮水板による床止め工法を下流側から順を追って説明する。
図３の図１の矢視Ａ−Ａ断面図に示すように、河底に河幅一杯に遮水シート３を敷設し、該遮水シート３上に袋詰め石工１を１層に設置して河床を形成し、さらに両護岸に沿って階段状に袋詰め石工１を２層段積みに形成する。
この根固め工によって、袋詰め石工１の１層の中央部には魚道としての通路４が形成され、この通路４の両側には前記袋詰め石工１の２層段積みが形成される。
さらに、この上流側には河幅を横断して鋼材の支柱を３層段積みの高さで河底に打設して、前記支柱に木材や樹脂による板を組み合わせた板柵土留め２の遮水板が設けられる。
前記遮水板には魚道となる切欠き部６が設けられ、この遮水板の切欠き部６により溢水する魚道水位が確保される。 A root fixing method for constructing the fishway of the present invention and a floor fixing method using a water shielding plate will be described in order from the downstream side.
As shown in the arrow AA cross-sectional view of FIG. 1 in FIG. 3, the impermeable sheet 3 is laid on the riverbed to the full width of the river, and the bagging masonry 1 is installed in one layer on the impermeable sheet 3. The riverbed is then formed, and the bagging masonry 1 is formed in a two-tiered structure in a staircase pattern along both revetments.
By this rooting work, a passage 4 as a fishway is formed in the center of one layer of the bagging masonry 1, and two layers of the bagging masonry 1 are formed on both sides of the passage 4.
Furthermore, on this upstream side, a steel fence strut 2 in which steel columns are placed on the bottom of the riverbed at a height of three layers stacked across the river width, and a plate made of wood or resin is combined with the columns. A water shielding plate is provided.
The water shielding plate is provided with a notch 6 serving as a fishway, and the fishway water level overflowing is secured by the notch 6 of the water shielding plate.

図４の図１の矢視Ｂ−Ｂ断面図に示すように、前記板柵土留め２の遮水板の上流側に、前述と同様に河底に河幅一杯に遮水シート３を敷設し、該遮水シート３上に袋詰め石工１を２層に設置して河床を形成し、さらに両護岸に沿って階段状に袋詰め石工１を１層段積みに形成する。
この根固め工によって、袋詰め石工１の２層の中央部には魚道としての通路４が形成され、この通路４の両側には前記袋詰め石工１の１層段積みが形成される。 As shown in the cross-sectional view taken along the line BB in FIG. 1 in FIG. 4, the water-impervious sheet 3 is laid on the upstream side of the water-impervious plate of the plate fence retaining ring 2 to the full river width as described above. Then, the bagging masonry 1 is installed in two layers on the water-impervious sheet 3 to form a river bed, and further, the bagging masonry 1 is formed in a single layer in a staircase pattern along both revetments.
By this rooting, a passage 4 as a fishway is formed in the center of the two layers of the bagging masonry 1, and a one-layer stack of the bagging masonry 1 is formed on both sides of the passage 4.

図５の図１の矢視Ｃ−Ｃ断面図に示すように、前述の魚道としての通路４の上流側に前記遮水シート３上に袋詰め石工１を１層に設置して河床を形成し、さらに両護岸に沿って階段状に袋詰め石工１を３層段積みに形成する。
この根固め工によって、袋詰め石工１の１層の中央部には魚巣としてのプール（深い淵）５が形成され、このプール（深い淵）５の両側には前記袋詰め石工１の３層段積みが形成される。
さらに、河幅を横断して鋼材の支柱を４層段積みの高さで河底に打設して、前記支柱に木材や樹脂による板を組み合わせた板柵土留め２の遮水板が設けられる。
前記遮水板には魚道となる切欠き部６が設けられ、この遮水板の切欠き部６により溢水する魚道水位が確保される。 As shown in the cross-sectional view taken along the line CC in FIG. 1 of FIG. 5, a riverbed is formed by installing a bag masonry 1 in a single layer on the water-impervious sheet 3 on the upstream side of the passage 4 as the fishway. In addition, the bagging masonry 1 is formed in a three-layered structure in a staircase pattern along both revetments.
By this root-setting work, a pool (deep coral) 5 as a fish nest is formed in the center of one layer of the bag masonry 1, and 3 of the bag masonry 1 is formed on both sides of this pool (deep coral) 5. A layer stack is formed.
In addition, steel pillars are placed at the bottom of the river at a height of 4 layers across the river width, and a water barrier is provided for the plate fence earth retaining plate 2 in which plates made of wood or resin are combined. It is done.
The water shielding plate is provided with a notch 6 serving as a fishway, and the fishway water level overflowing is secured by the notch 6 of the water shielding plate.

図６の図１の矢視Ｄ−Ｄ断面図に示すように、前記板柵土留め２の遮水板の上流側に、前述と同様に河底に河幅一杯に遮水シート３を敷設し、該遮水シート３上に袋詰め石工１を２層に設置して河床を形成し、さらに両護岸に沿って階段状に袋詰め石工１を１層段積みに形成する。
この根固め工によって、袋詰め石工１の２層の中央部には魚道としての通路４が形成され、この通路４の両側には前記袋詰め石工１の１層段積みが形成される。 As shown in the arrow DD cross-sectional view of FIG. 1 in FIG. 6, a water-impervious sheet 3 is laid on the upstream side of the water-impervious plate of the plate fence retainer 2 to the full river width in the same manner as described above. Then, the bagging masonry 1 is installed in two layers on the water-impervious sheet 3 to form a river bed, and further, the bagging masonry 1 is formed in a single layer in a staircase pattern along both revetments.
By this rooting, a passage 4 as a fishway is formed in the center of the two layers of the bagging masonry 1, and a one-layer stack of the bagging masonry 1 is formed on both sides of the passage 4.

図７の図１の矢視Ｅ−Ｅ断面図に示すように、前述の魚道としての通路４の上流側に前記遮水シート３上に袋詰め石工１を１層に設置して河床を形成し、さらに両護岸に沿って階段状に袋詰め石工１を３層段積みに形成する。
この根固め工によって、袋詰め石工１の１層の中央部には魚巣としてのプール（深い淵）５が形成され、このプール（深い淵）５の両側には前記袋詰め石工１の３層段積みが形成される。
さらに、河幅を横断して鋼材の支柱を４層段積みの高さで河底に打設して、前記支柱に木材や樹脂による板を組み合わせた板柵土留め２の遮水板が設けられる。
前記遮水板には魚道となる切欠き部６が設けられ、この遮水板の切欠き部６により溢水する魚道水位が確保される。 As shown in the arrow EE cross-sectional view of FIG. 1 in FIG. 7, a riverbed is formed by installing a bagging masonry 1 in a single layer on the water-impervious sheet 3 on the upstream side of the passage 4 as a fishway described above. In addition, the bagging masonry 1 is formed in a three-layered structure in a staircase pattern along both revetments.
By this root-setting work, a pool (deep coral) 5 as a fish nest is formed in the center of one layer of the bag masonry 1, and 3 of the bag masonry 1 is formed on both sides of this pool (deep coral) 5. A layer stack is formed.
In addition, steel pillars are placed at the bottom of the river at a height of 4 layers across the river width, and a water barrier is provided for the plate fence earth retaining plate 2 in which plates made of wood or resin are combined. It is done.
The water shielding plate is provided with a notch 6 serving as a fishway, and the fishway water level overflowing is secured by the notch 6 of the water shielding plate.

図８の図１の矢視Ｆ−Ｆ断面図に示すように、前記板柵土留め２の遮水板の上流側に、前述と同様に河底に河幅一杯に遮水シート３を敷設し、該遮水シート３上に袋詰め石工１を３層に設置して河床を形成し、さらに両護岸に沿って階段状に袋詰め石工１を１層段積みに形成する。
この根固め工によって、袋詰め石工１の３層の中央部には魚道としての通路４が形成され、この通路４の両側には前記袋詰め石工１の１層段積みが形成される。 As shown in the cross-sectional view taken along the line FF in FIG. 1 in FIG. 8, the impermeable sheet 3 is installed on the upstream side of the impermeable board of the plate fence retaining ring 2 to the full river width in the same manner as described above. Then, the bagging masonry 1 is installed in three layers on the water-impervious sheet 3 to form a river bed, and the bagging masonry 1 is formed in a single layer in a staircase pattern along both revetments.
By this rooting, a passage 4 as a fishway is formed in the center of the three layers of the bagging masonry 1, and a one-layer stack of the bagging masonry 1 is formed on both sides of the passage 4.

図９の図１の矢視Ｇ−Ｇ断面図に示すように、前述の魚道としての通路４の上流側に前記遮水シート３上に袋詰め石工１を２層に設置して河床を形成し、さらに両護岸に沿って階段状に袋詰め石工１を２層段積みに形成する。
この根固め工によって、袋詰め石工１の２層の中央部には魚巣としてのプール（深い淵）５が形成され、このプール（深い淵）５の両側には前記袋詰め石工１の２層段積みが形成される。 As shown in the arrow GG cross-sectional view of FIG. 1 in FIG. 9, the riverbed is formed by installing the bagging masonry 1 in two layers on the water-impervious sheet 3 on the upstream side of the passage 4 as the fishway described above. Further, the bagging masonry 1 is formed in a two-layered structure in a staircase pattern along both revetments.
By this rooting, a pool (deep coral) 5 as a fish nest is formed at the center of the two layers of the bag masonry 1, and 2 of the bag masonry 1 are formed on both sides of the pool (deep coral) 5. A layer stack is formed.

図１０の図１の矢視Ｈ−Ｈ断面図に示すように、前述の魚巣としてのプール（深い淵）５の上流側に前記遮水シート３上に袋詰め石工１を２層に設置して河床を形成し、さらに両護岸に沿って階段状に袋詰め石工１を１層段積みに形成する。
この根固め工によって、袋詰め石工１の２層の中央部には魚道としての通路４が形成され、この通路４の両側には前記袋詰め石工の１層段積みが形成される。 As shown in the HH sectional view of FIG. 1 in FIG. 10, the bagging masonry 1 is installed in two layers on the water shielding sheet 3 on the upstream side of the aforementioned pool (deep coral) 5 as a fish nest. Then, the riverbed is formed, and further, the bagging masonry 1 is formed in a one-tiered structure in a staircase pattern along both revetments.
By this rooting, a passage 4 as a fishway is formed at the center of the two layers of the bagging masonry 1, and the one-layer stack of the bagging masonry is formed on both sides of the passage 4.

図１１の斜視図に示すように、このようにして構築された本発明の魚道を構築するための根固め工と遮水板による床止め工法は、河底に河幅一杯に遮水シート３を敷設し、袋詰め石工１を設置することにより伏流水を防止すると共に、河幅を横断して鋼材の支柱を河底に打設して、前記支柱に木材や樹脂による板を組み合わせた板柵土留め２の遮水板が設けられ、該遮水板には切欠き部６が設けられるため、魚道が形成される。
このようにして、床止め工と魚道を容易且つ安価に設置可能とすること及び不定形な河道断面に対しても床止め工と魚道を設置可能とすることができる。
上流からの流水は最上流の板柵土留め２の遮水板により堰き止められ、満水状態から最上流の遮水板の切欠き部６から溢水され、次段の遮水板により満水状態のプール(深い淵)５へ落水し、更に次段の遮水板の切欠き部６から溢水され、次段のプール（深い淵）５へ落水する。この落水高さは、河川流量および対象魚に対応した自由な形状によって設定される。
また、前記板柵土留め２の遮水板の切欠き部６の直下流には、魚巣としてのプール（深い淵）５が形成されているので、魚類の通過が容易となる。
上記実施の実施の形態によれば、根固め工の袋詰め石工の段積み及び板柵土留めの遮水工により床止め工を構築し、板柵土留めの遮水板の切欠き部により魚道を形成し、河底に遮水シートを敷設することにより伏流を防止すると共に、根固め工の袋詰め石工の配置により魚道としての通路およびプールを設けるため、床止め工と魚道を容易且つ安価に設置可能とすることができ、不定形な河道断面に対しても設置可能とすることができる効果がある。
さらに、用地の拡幅、堤防の開削等が不要になり、工期の短縮、工費の削減につながる。また現地発生のコンクリートガラの再利用が可能であり、産業廃棄物も少なく工費の削減になる。すなわち、改修された河川には護岸が設置されているケースが多く、洪水などにより河床低下が進行した場合、再度の改修時に既設護岸を撤去し新たな護岸を設置することとなる。撤去する既設護岸はコンクリ−トガラとなり産業廃棄物として費用をかけて処理する。しかしながら、本実施の形態によれば当該コンクリ−トガラを再利用し袋詰め石工１に使用することで経費の削減となる。
なお、切欠き部の形状は、正面視矩形に限定されず、三角その他の多角形、半円形、半楕円形等、本発明を実施する上で好適な形状することが出来る。また、孔であってもよい。
また、遮水板６は、上記実施の形態では三分割されたものであったが、２つ又は４つ以上に分割されたものであっても、また一体のものであってもよい。 As shown in the perspective view of FIG. 11, the floor fixing method using the root hardening method and the water shielding plate for constructing the fishway of the present invention constructed as described above is the water shielding sheet 3 on the river bed to the full width of the river. This is a plate that prevents underground water by installing a masonry 1 and lays a steel column on the riverbed across the river width, and combines the column with wood and resin. Since the water shielding plate of the fence earth retaining plate 2 is provided, and the notch portion 6 is provided in the water shielding plate, a fishway is formed.
In this way, it is possible to easily and inexpensively install the floor stopper and the fishway, and it is possible to install the floor stopper and the fishway even for an irregular river channel cross section.
The water from the upstream is blocked by the water shielding plate of the uppermost plate fence retaining ring 2 and overflows from the notch 6 of the uppermost water shielding plate from the full water state, and is filled by the next water shielding plate. The water falls into the pool (deep trough) 5 and overflows from the notch 6 of the next-stage impermeable board, and falls into the next-stage pool (deep trough) 5. This falling water height is set by a free shape corresponding to the river flow and the target fish.
Moreover, since a pool (deep coral) 5 as a fish nest is formed immediately downstream of the notch portion 6 of the water shielding plate of the plate fence earth retaining plate 2, passage of fish is facilitated.
According to the embodiment of the above embodiment, the flooring work is constructed by stacking the bagging masonry of the caulking work and the impervious structure of the board fence earth retaining, and by the notch portion of the impermeable board of the board fence earth retaining. Forming a fishway and laying a water-impervious sheet at the bottom of the river to prevent subsidence, and the placement of a bagging masonry as a rooter will provide a passage and pool as a fishway. There is an effect that it can be installed at low cost and can be installed even on an irregular river channel cross section.
Furthermore, widening of the site and excavation of the dike are no longer necessary, leading to a shortened construction period and reduced construction costs. In addition, it is possible to reuse locally generated concrete glass, which reduces industrial waste and reduces construction costs. In other words, rehabilitated rivers are often equipped with revetments, and when the riverbed declines due to flooding, the existing revetment is removed and a new revetment is installed at the time of refurbishment. The existing revetment to be removed becomes a concrete gala and is treated as industrial waste at a high cost. However, according to this embodiment, the cost can be reduced by reusing the concrete glass and using it for the bagging masonry 1.
Note that the shape of the notch is not limited to a rectangular shape when viewed from the front, and may be a shape suitable for practicing the present invention, such as a triangle or other polygonal shape, a semicircular shape, or a semielliptical shape. Moreover, a hole may be sufficient.
Moreover, although the water shielding board 6 was divided into three in the said embodiment, it may be divided into 2 or 4 or more, and may be integrated.

１ 袋詰め石工（根固め工）
２ 板柵土留め（遮水板）
３ 遮水シート
４ 通路
５ プール（深い淵）
６ 切欠き部 1 Bag masonry (root hardening)
2 Board fence earth retaining (water shielding board)
3 Water-blocking sheet 4 Passage 5 Pool (deep wall)
6 Notch

Claims (2)

川底に敷設された遮水シートと、
根固め工と、
川底に打設された遮水板とを備え、
前記遮水板には魚が通過可能な切欠き部が設けられ、
前記遮水板に接する下流側の根固め工は、さらに下流側の根固め工よりも低く配置されることによりプールが形成されていることを特徴とする床止め工。 A water shielding sheet laid on the bottom of the river,
Root-setting work,
With a water shielding plate placed at the bottom of the river,
The water shielding plate is provided with a notch through which fish can pass ,
A floor anchoring work characterized in that a pool is formed by arranging a downstream root- setting work in contact with the water shielding plate lower than a downstream root- setting work. 前記根固め工により前記遮水板の川幅方向端部が固定されていることを特徴とする請求項１に記載の床止め工。 The floor stopper according to claim 1 , wherein a river width direction end portion of the water shielding plate is fixed by the rooting work.
JP2011140740A 2010-12-20 2011-06-24 Floor stopper Expired - Fee Related JP5518795B2 (en)

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