JP4998688B2 - Towing-type bottom sediment removal apparatus and bottom sediment removal method - Google Patents

Towing-type bottom sediment removal apparatus and bottom sediment removal method Download PDF

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JP4998688B2
JP4998688B2 JP2006257440A JP2006257440A JP4998688B2 JP 4998688 B2 JP4998688 B2 JP 4998688B2 JP 2006257440 A JP2006257440 A JP 2006257440A JP 2006257440 A JP2006257440 A JP 2006257440A JP 4998688 B2 JP4998688 B2 JP 4998688B2
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sediment
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sand
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仁志 野口
雄治 藤田
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INDEPENDENT ADMINISTRATIVE INSTITUTION PORT AND AIRPORT RESEARCH INSTITUTE
Toray Engineering Co Ltd
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INDEPENDENT ADMINISTRATIVE INSTITUTION PORT AND AIRPORT RESEARCH INSTITUTE
Toyo Construction Co Ltd
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本発明は、海底、河底、湖底等の水底に堆積した土砂を除去するため水底土砂除去装置および水底土砂除去工法に関する。   The present invention relates to a bottom sediment removal apparatus and a bottom sediment removal method for removing sediment deposited on the bottom of a seabed, riverbed, lake bottom, or the like.

従来、この種の水底土砂除去装置としては、特許文献1に記載されるものがあった。このものは、図9に示されるように、複数の土砂流入口1が長手方向に配設された土砂移送管2と複数の水噴出口3が長手方向に配設された流体噴出管(給水管)4とを備え、該流体噴出管4を土砂移送管2の下側に並設して一体の複合管5を構成し、この複合管5を水底の堆積土砂6中に沈設し、土砂移送管2の一端側に搭載した吸引ポンプ(図示略)により該土砂移送管2内に一方向の水流を発生させると共に、水噴出口3から水ジェットを噴出させ、土砂流入口1から土砂移送管2内に土砂を流入させて、この土砂を前記水流に乗せて外部へ排出するようになっている。このような水底土砂除去装置においては、給水管4の水噴出口3から下方へ噴出される水ジェットにより堆積土砂6が流動化し、土砂移送管2内への土砂の流入が促進されて、効率のよい土砂の除去が可能になる。   Conventionally, as this kind of underwater sediment removal apparatus, there was one described in Patent Document 1. As shown in FIG. 9, this is composed of a sediment transport pipe 2 in which a plurality of sediment inlets 1 are disposed in the longitudinal direction and a fluid ejection pipe (water supply in which a plurality of water ejection ports 3 are disposed in the longitudinal direction. 4), and the fluid ejection pipe 4 is arranged below the earth and sand transfer pipe 2 to form an integrated composite pipe 5. The composite pipe 5 is submerged in the sedimentary sand 6 on the bottom of the earth and sand. A suction pump (not shown) mounted on one end side of the transfer pipe 2 generates a one-way water flow in the earth and sand transfer pipe 2, and a water jet is jetted from the water outlet 3, thereby transferring the earth and sand from the earth and sand inlet 1. Sediment is caused to flow into the pipe 2, and the sediment is placed on the water flow and discharged to the outside. In such a bottom sediment removal apparatus, sedimentary sediment 6 is fluidized by a water jet ejected downward from the water jet 3 of the water supply pipe 4, and the inflow of sediment into the sediment transport pipe 2 is promoted. It is possible to remove soil with good quality.

特開2004−300710号公報JP 2004-300710 A

しかるに、上記特許文献1に記載される水底土砂除去装置は、土砂移送管2と給水管4とを並設した複合管5を水底の堆積土砂6中に沈設した状態で、固定設備として用いられるようになっており、このため、土砂の除去範囲は土砂移送管2の周辺に限定される、という問題があった。   However, the bottom sediment removal apparatus described in Patent Document 1 is used as a fixed facility in a state where the composite pipe 5 in which the sediment transport pipe 2 and the water supply pipe 4 are juxtaposed is set in the sediment sediment 6 on the bottom. Therefore, there has been a problem that the removal range of earth and sand is limited to the periphery of the earth and sand transfer pipe 2.

ところで、土砂の除去範囲を拡大するには、上記土砂移送管2(複合管5)を水底上で平行移動させればよく、例えば、重機(クレーン)で吊って移動させることが考えられる。しかし、この場合は、重機の行動範囲に自ずから限界があるため、土砂移送管の移動範囲は限られたものとなり、その上、コストのかかる重機作業によってコスト負担の増大が避けられないようになる。   By the way, in order to expand the removal range of earth and sand, the earth and sand transfer pipe 2 (composite pipe 5) may be moved in parallel on the bottom of the water. For example, it may be hung and moved by a heavy machine (crane). However, in this case, since the range of action of heavy machinery is naturally limited, the range of movement of the earth and sand transfer pipe is limited, and in addition, an increase in cost burden is unavoidable due to expensive heavy machinery work. .

一方、けん引式で土砂移送管を水底上で平行移動させることが考えられる。このけん引式によれば、けん引用ワイヤを延ばすことで、土砂移送管の移動範囲を拡大することができ、コストの安いウインチの使用も可能になって、利用価値は大きく高まるものと期待される。   On the other hand, it is conceivable to move the earth and sand transfer pipe in parallel on the bottom of the water by a tow type. According to this towing type, by extending the towing wire, it is possible to expand the range of movement of the earth and sand transfer pipe, and it is possible to use a winch with low cost, and the utility value is expected to increase greatly. .

しかしながら、上記特許文献1に記載される水底土砂除去装置は、土砂移送管2の一端側に吸引ポンプが搭載されているため、左右の重量バランスが悪く、そのままでは、土砂移送管2を安定して平行移動させることが困難となる。また、土砂移送管2の下部に給水管4が配置されているため、土砂移送管2(複合管5)を平行移動させると、給水管4が大きな土砂抵抗を受け、土砂移送管2の円滑な移動が困難になる。   However, the bottom sediment removal apparatus described in Patent Document 1 has a suction pump mounted on one end side of the sediment transport pipe 2, so that the weight balance between the left and right is bad, and the sediment transport pipe 2 is stabilized as it is. Making it difficult to translate. Further, since the water supply pipe 4 is arranged at the lower part of the earth and sand transfer pipe 2, when the earth and sand transfer pipe 2 (composite pipe 5) is moved in parallel, the water supply pipe 4 receives a large earth and sand resistance and the earth and sand transfer pipe 2 is smooth. Movement becomes difficult.

本発明は、上記した技術的背景に鑑みてなされたもので、その課題とするところは、けん引式によって土砂移送管を安定してかつ円滑に平行移動させることができるようにし、もって土砂除去範囲の拡大に大きく寄与するけん引式水底土砂除去装置およびけん引式水底土砂除去工法を提供することにある。   The present invention has been made in view of the technical background described above, and the object of the present invention is to enable the sediment transport pipe to be stably and smoothly translated by the towing method, and thus the sediment removal range. It is to provide a towed bottom sediment removal method and a towed bottom sediment removal method that greatly contributes to the expansion of water.

上記課題を解決するため、本発明に係るけん引式水底土砂除去装置は、複数の土砂流入口が長手方向に配設された土砂移送管と複数の水噴出口が長手方向に配設された給水管とを並設してなる複合管を水底の堆積土砂中に沈設し、前記土砂移送管に搭載した吸引ポンプにより該土砂移送管内に水流を起こすと共に、前記水噴出口から水ジェットを噴出させて、前記土砂流入口から土砂移送管内に土砂を流入させ、かつ該土砂を前記水流に乗せて外部へ排出する水底土砂除去装置において、前記吸引ポンプを前記土砂移送管の中央に配置すると共に、前記給水管を前記土砂移送管の上部側に配置し、前記給水管の水噴出口は、該給水管から前記土砂移送管内を貫通して下方へ延ばした枝管の先端に開口させ、かつけん引方式により前記土砂移送管を水底上で平行移動させることを特徴とする。   In order to solve the above problems, a towed bottom sediment removal apparatus according to the present invention includes a sediment transport pipe having a plurality of sediment inlets disposed in the longitudinal direction and a water supply having a plurality of water jets disposed in the longitudinal direction. A composite pipe formed side by side with the pipe is set in the sediment at the bottom of the water, and a water flow is generated in the sediment transport pipe by a suction pump mounted on the sediment transport pipe, and a water jet is ejected from the water jet outlet. In the bottom sediment removal apparatus for allowing sediment to flow into the sediment transport pipe from the sediment flow inlet and discharging the sediment on the water stream to the outside, the suction pump is disposed at the center of the sediment transport pipe, The water supply pipe is arranged on the upper side of the earth and sand transfer pipe, and the water outlet of the water supply pipe is opened at the tip of a branch pipe extending downward from the water supply pipe through the earth and sand transfer pipe. The above earth and sand transfer by the method Wherein the translating the on the sea bed.

このように構成したけん引式水底土砂除去装置においては、土砂移送管の中央に吸引ポンプを配置しているので、その左右の重量バランスがよくなり、けん引式で土砂移送管を安定して平行移動させることができる。また、土砂移送管の上部側に給水管を配置し、該給水管から土砂移送管内を貫通して下方へ延ばした枝管の先端に水噴出口を開口させているので、土砂移送管を平行移動させる際、給水管の枝管の先端部のみに土砂抵抗がかかるだけとなり、給水管にかかる土砂抵抗が大幅に低減して土砂移送管の移動が円滑となる。   In the towing-type bottom sediment removal device configured in this way, the suction pump is arranged in the center of the sediment transport pipe, so the weight balance between the left and right is improved, and the tow-type sediment transport pipe is stably translated Can be made. In addition, a water supply pipe is arranged on the upper side of the earth and sand transfer pipe, and the water jet outlet is opened at the tip of the branch pipe that extends downward from the water supply pipe through the inside of the earth and sand transfer pipe. When moving, only the earth and sand resistance is applied only to the tip of the branch pipe of the water supply pipe, the earth and sand resistance applied to the water supply pipe is greatly reduced, and the earth and sand transfer pipe moves smoothly.

本けん引式水底土砂除去装置において、上記土砂流入口は、土砂移送管の少なくとも下部に設けられており、該土砂流入口と給水管の水噴出口とが、複合管の長手方向に交互に配列されるようにしてもよい。この場合は、水噴出口から噴出された水ジェットにより流動化した土砂が、当該水噴出口に隣接する土砂流入口から土砂移送管内に円滑に流入し、土砂の除去効率が向上する。   In the towing type bottom sediment removal apparatus, the sediment inlet is provided at least in the lower part of the sediment transport pipe, and the sediment inlet and the water jet of the water supply pipe are alternately arranged in the longitudinal direction of the composite pipe. You may be made to do. In this case, the earth and sand fluidized by the water jets ejected from the water outlet smoothly flows into the earth and sand transfer pipe from the earth and sand inlet adjacent to the water outlet and the sediment removal efficiency is improved.

本けん引式水底土砂除去装置は、けん引方向に向けられた土砂移送管の側部に沿って複数の第2の水噴出口を配設し、該第2の水噴出口は、給水管から該土砂移送管の周面に沿って下方へ延ばした第2の枝管の先端に開口させた構成としてもよいものである。このように構成した場合は、土砂移送管の前方へも水ジェットが噴出されるので、けん引方向の前側に存在する土砂も流動化し、土砂移送管の平行移動がより円滑となる。   The towing-type bottom sediment removal apparatus includes a plurality of second water jets disposed along the side of the earth and sand transfer pipe directed in the towing direction, and the second water jets are provided from the water supply pipe. It is good also as a structure opened at the front-end | tip of the 2nd branch pipe extended below along the surrounding surface of the earth-and-sand transfer pipe | tube. In such a configuration, since the water jet is also ejected forward of the sediment transport pipe, the soil present on the front side in the towing direction also fluidizes, and the parallel movement of the sediment transport pipe becomes smoother.

本けん引式水底土砂除去装置はまた、上記第2の水噴出口の配設に代えて、けん引方向に向けられた土砂移送管の側部に、その長手方向に沿って櫛歯状に突起を設けてもよいもので、この場合は、突起によってけん引方向前側の土砂が解されるので、土砂移送管の平行移動がより円滑となる。また、給水管に第2の枝管を設ける必要がないので、給水管の構造が簡単となる。   The towing-type bottom sediment removal apparatus is also provided with a comb-like projection along the longitudinal direction on the side of the earth-and-sand transport pipe directed in the towing direction, instead of disposing the second water jet port. In this case, since the earth and sand on the front side in the traction direction are unraveled by the protrusions, the parallel movement of the earth and sand transfer pipe becomes smoother. Moreover, since it is not necessary to provide a 2nd branch pipe in a water supply pipe, the structure of a water supply pipe becomes simple.

本けん引式水底土砂除去装置において、上記土砂移送管は、吸引ポンプの配置部位を中心としてV字形をなし、該V字形の開き側を前向きにしてけん引されるようにしてもよい。前記土砂移送管が直線状であると、その平行移動に応じて前方の土砂が管端側へ移動し、管端周辺に土砂が堆積しやすくなって土砂抵抗が大きくなるが、前記したように土砂移送管をV字形とした場合は、移動方向前側の土砂が土砂移送管の傾斜に沿って中央側に集まり易くなり、前記した管端周辺での土砂抵抗が低減される。また、中央側に土砂が集まることで、土砂移送管の移動範囲内の土砂の取り残しが少なくなる。さらに、土砂移送管をV字形とすることで、水底への座りがよくなり、けん引時の姿勢が安定する。   In the towing type submarine sediment removing apparatus, the earth and sand transfer pipe may be formed in a V shape centering on a portion where the suction pump is arranged, and towed with the open side of the V shape facing forward. If the earth and sand transfer pipe is linear, the forward earth and sand will move to the pipe end side according to the parallel movement, and sediment will easily accumulate around the pipe end, increasing the earth and sand resistance. When the earth and sand transfer pipe is V-shaped, the earth and sand on the front side in the moving direction easily gather on the center side along the inclination of the earth and sand transfer pipe, and the earth and sand resistance around the pipe end is reduced. In addition, the collection of earth and sand at the center side reduces the amount of left behind in the movement range of the earth and sand transfer pipe. Furthermore, by making the earth and sand transfer pipe V-shaped, the sitting on the bottom of the water is improved, and the posture during towing is stabilized.

さらに、本けん引式水底土砂除去装置は、上記複合管に、吊り部材を介してフロートを連結し、前記フロートの浮力または前記吊り部材の長さを遠隔操作により調整可能としてもよいものである。この場合は、フロートにより前記複合管を浮かせることで土砂除去域への搬入・出が容易となるので、陸域から離れた沖合での土砂除去作業も簡単に行うことができる。また、複合管をフロートの浮力または吊り部材の長さを調整することにより一定水深以浅に保持することで、一定水深以浅の水底の堆積土砂のみを除去する浚渫も可能になる。   Furthermore, the towing-type bottom sediment removal apparatus may be configured such that a float is connected to the composite pipe via a suspension member, and the buoyancy of the float or the length of the suspension member can be adjusted by remote control. In this case, since the composite pipe is floated by a float, it can be easily carried into and out of the earth and sand removal area, and therefore the earth and sand removal work offshore from the land area can be easily performed. Further, by holding the composite pipe at a shallow depth or less by adjusting the float buoyancy of the float or the length of the suspension member, it is possible to remove only sediment sediment on the bottom of the water below the fixed depth.

上記課題を解決するため、本発明に係るけん引式水底土砂除去工法は、上記したように構成された各水底土砂除去装置を水底の堆積土砂中に沈設し、吸引ポンプにより土砂移送管内に水流を起こしかつ給水管の水噴出口から水ジェットを噴出させながら、該水底土砂除去装置をけん引して土砂移送管を水底上で平行移動させることを特徴とする。
このように行う水底土砂除去工法においては、水底土砂除去装置をけん引して土砂移送管を水底上で平行移動させるので、広範囲の土砂を除去することができる。
In order to solve the above-described problems, the tow-type bottom sediment removal method according to the present invention is configured such that each bottom sediment removal apparatus configured as described above is set in the sediment sediment on the bottom, and a water flow is generated in the sediment transport pipe by a suction pump. While raising and ejecting a water jet from the water outlet of the water supply pipe, the bottom sediment removal apparatus is towed to translate the sediment transport pipe on the bottom.
In the bottom sediment removal method performed in this way, the bottom sediment removal device is towed and the sediment transport pipe is translated on the bottom, so that a wide range of sediment can be removed.

本けん引式水底土砂除去工法において、水底土砂除去装置をけん引する方法は任意であるが、陸域に据付けたけん引手段によりけん引用ワイヤを水底に這わせる状態でけん引する場合は、船舶航行を邪魔することがないので、陸域から離れた場所の土砂除去を行う場合に有用となる。この場合、けん引手段として、オートテンションウインチを用いるのが望ましく、これにより土砂堆積状況によって土砂抵抗が変化しても、土砂移送管の移動速度が自動的に調整され、取り残しが著しく少なくなる。また、土砂移送管に過度なけん引力が加わることがなくなるので、ワイヤの断線などのトラブルもなくなり、安全性が向上する。   In this towing-type bottom sediment removal method, the method of towing the bottom sediment removal device is optional, but when towing the towing wire on the bottom by the towing means installed on the land, the vessel navigation is disturbed. This is useful when removing soil and sand away from the land. In this case, it is desirable to use an auto-tension winch as the traction means, so that the moving speed of the earth and sand transfer pipe is automatically adjusted even if the earth and sand resistance changes depending on the situation of earth and sand accumulation, and the remaining amount is remarkably reduced. Further, since excessive traction force is not applied to the earth and sand transfer pipe, troubles such as wire breakage are eliminated, and safety is improved.

本発明に係るけん引式水底土砂除去装置および水底土砂除去工法によれば、けん引式で土砂移送管を安定してかつ円滑に平行移動させることができるので、土砂除去範囲の拡大に大きく寄与し、移動に要するコスト負担の増大も抑えられて、その利用価値は大なるものがある。   According to the towing-type bottom sediment removal apparatus and the bottom sediment removal method according to the present invention, it is possible to stably and smoothly translate the sediment transport pipe in the towing type, greatly contributing to the expansion of the sediment removal range, The increase in cost burden required for movement is also suppressed, and its utility value is great.

以下、本発明を実施するための最良の形態を添付図面に基づいて説明する。   The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

図1〜5は、本発明の一つの実施形態であるけん引式水底土砂除去装置を示したものである。図において、10は、複数の土砂流入口11が長手方向に配設された土砂移送管12と、複数の水噴出口(噴射ノズル)13が長手方向に配設された給水管14とを並設してなる複合管であり、ここでは、土砂移送管12の上部側に給水管14が配置されている。土砂移送管12は、左右の直管12A,12Bを中央の連接管15を介して接続してなっており、その全体は、連接管15を中心にV字形をなしている。また、給水管14は、左右の直管14A,14Bを中央の連接管16を介して接続してなっており、その全体も、前記土砂移送管12に合せてV字形をなしている。   1 to 5 show a towing-type bottom sediment removal apparatus that is one embodiment of the present invention. In the figure, 10 is a parallel arrangement of a sediment transport pipe 12 in which a plurality of sediment inlets 11 are disposed in the longitudinal direction and a water supply pipe 14 in which a plurality of water jets (spray nozzles) 13 are disposed in the longitudinal direction. In this case, a water supply pipe 14 is arranged on the upper side of the earth and sand transfer pipe 12. The earth and sand transfer pipe 12 is formed by connecting right and left straight pipes 12 </ b> A and 12 </ b> B via a central connecting pipe 15, and the whole is V-shaped with the connecting pipe 15 as a center. The water supply pipe 14 is formed by connecting right and left straight pipes 14 </ b> A and 14 </ b> B via a central connecting pipe 16, and the whole of the water supply pipe 14 is also V-shaped in accordance with the earth and sand transfer pipe 12.

上記土砂移送管12の中央に位置する連接管15の上部には土砂流出口17が設けられており、この土砂流出口17には、その周りのフランジ18を利用して吸引ポンプ19が接続されている。吸引ポンプ19には、土砂排送ホース20の一端が接続されるようになっており、この土砂排送ホース18の他端は、図示を略す土砂集積地まで延ばされる。一方、給水管14の中央に位置する連接管16は、土砂移送管12側の連接管15の背後に門形をなすように取り回されており、その中間部位には、給水源(給水ポンプ)から延ばした給水ホース(図示略)を接続するための管継手21が設けられている。   An earth and sand outlet 17 is provided in the upper part of the connecting pipe 15 located at the center of the earth and sand transfer pipe 12, and a suction pump 19 is connected to the earth and sand outlet 17 using a flange 18 around the outlet. ing. One end of a sediment discharge hose 20 is connected to the suction pump 19, and the other end of the sediment discharge hose 18 is extended to a sediment accumulation site (not shown). On the other hand, the connecting pipe 16 located in the center of the water supply pipe 14 is routed in a gate shape behind the connecting pipe 15 on the earth and sand transfer pipe 12 side, and a water supply source (water supply pump) is provided at an intermediate portion thereof. ) Is provided with a pipe joint 21 for connecting a water supply hose (not shown) extended from the pipe.

土砂移送管12の土砂流入口11は、ここでは下部に開口する第1の土砂流入口11aと下方側部に開口する第2の土砂流入口11bとの2列配置となっており、両者は、土砂移送管12を構成する直管12A,12Bの軸方向に1/2ピッチずらして配置されている。また、上記給水管14の水噴射口13は、ここでは給水管14から土砂移送管12内を貫通して下方へ延ばした第1の枝管22の先端に開口する第1の水噴出口13aと給水管14から土砂移送管12の周面に沿って下方へ延ばした第2の枝管23の先端に開口する第2の水噴出口13bとの2列配置となっており、両者は、給水管14を構成する直管14A,14Bの軸方向に1/2ピッチずらして配置されている。一方、第1の土砂流入口11aと第2の水噴出口13b、第2の土砂流入口11bと第1の水噴出口13aとは、それぞれ複合管10の長手方向位置を一致させて配置されている。したがって、第1の土砂流入口11aと第1の水噴出口13b、第2の土砂流入口11bと第2の水噴出口13bとは、それぞれ複合管10の長手方向に交互に配置された状態となっている(図1)。なお、水噴出口13を構成する第2の水噴出口13bは、水平方向へ口向きが設定されている。   The earth and sand inlet 11 of the earth and sand transfer pipe 12 is arranged in two rows here, a first earth and sand inlet 11a that opens to the lower part and a second earth and sand inlet 11b that opens to the lower side. The straight pipes 12A and 12B constituting the earth and sand transfer pipe 12 are arranged with a 1/2 pitch shift in the axial direction. The water injection port 13 of the water supply pipe 14 is here a first water jet 13a that opens from the water supply pipe 14 to the tip of the first branch pipe 22 that extends downward through the earth and sand transfer pipe 12. And a second water jet port 13b opened at the tip of the second branch pipe 23 extending downward from the water supply pipe 14 along the peripheral surface of the earth and sand transfer pipe 12, The straight pipes 14 </ b> A and 14 </ b> B constituting the water supply pipe 14 are arranged so as to be shifted by 1/2 pitch in the axial direction. On the other hand, the first earth and sand inflow port 11a and the second water jet outlet 13b, and the second earth and sand inflow port 11b and the first water jet outlet 13a are arranged so that the longitudinal positions of the composite pipes 10 coincide with each other. ing. Therefore, the 1st earth and sand inflow port 11a and the 1st water jet 13b, and the 2nd earth and sand inflow port 11b and the 2nd water jet 13b are arranged in the longitudinal direction of compound pipe 10 by turns, respectively. (Fig. 1). Note that the second water jet 13b constituting the water jet 13 is set in the horizontal direction.

土砂移送管12の土砂流入口11は、中央の連接管15の下面および側面にも設けられている。また、この連接管15の下面には複数の水噴出口13が設けられており、この水噴射管13には、給水管14を構成する直管14A,14Bの一端から延ばした第3の枝管24が接続されている(図2)。また、複合管10の両端の外側には、給水管14を構成する直管14A,14Bから分岐した第4、第5の枝管25,26が配設されている。これら枝管のうち、第4の枝管25は上記第1の枝管22と同様に下方へ延ばされ、第5の枝管26は、その先端が土砂移送管12(12A,12B)内へ導入されている。さらに、土砂移送管12を構成する各直管12A,12Bの管端には、複数の水流入口27(図5)が設けられている。   The earth and sand inlet 11 of the earth and sand transfer pipe 12 is also provided on the lower surface and side surface of the central connecting pipe 15. A plurality of water jets 13 are provided on the lower surface of the connecting pipe 15, and a third branch extending from one end of the straight pipes 14 </ b> A and 14 </ b> B constituting the water supply pipe 14 is provided in the water jet pipe 13. A tube 24 is connected (FIG. 2). Further, outside the both ends of the composite pipe 10, fourth and fifth branch pipes 25 and 26 branched from the straight pipes 14 </ b> A and 14 </ b> B constituting the water supply pipe 14 are disposed. Among these branch pipes, the fourth branch pipe 25 extends downward in the same manner as the first branch pipe 22, and the tip of the fifth branch pipe 26 is in the sediment transport pipe 12 (12A, 12B). Has been introduced. Furthermore, a plurality of water inlets 27 (FIG. 5) are provided at the pipe ends of the straight pipes 12A and 12B constituting the earth and sand transfer pipe 12.

ここで、本水底土砂除去装置Mは、水底の堆積土砂28(図3〜5)中に沈設され、この状態で水底上をけん引されるようになっている。図1中、29は、陸域に据付けたウインチ(けん引手段)から延ばされたけん引用ワイヤを表しており、該ワイヤ29は、複合管10を構成する土砂移送管12の両端に設けた連結部材30(図5)に連結されている。複合管10(土砂移送管12、給水管14)は、そのV字形の開き側を前向きにしてけん引されるようになっており、前記ワイヤ29は、必要に応じて中央の連接管15を含む土砂移送管12の適当箇所に連結される。なお、31は、装置全体を吊るための複数のアイプレートであり(図1)、該アイプレート31は土砂移送管12の長手方向の適所に複数設けられる。   Here, the main bottom sediment removal apparatus M is set in the bottom sediment sediment 28 (FIGS. 3 to 5), and is pulled on the bottom in this state. In FIG. 1, reference numeral 29 denotes a towing wire extended from a winch (towing means) installed in a land area, and the wire 29 is a connection provided at both ends of the earth and sand transfer pipe 12 constituting the composite pipe 10. It is connected to the member 30 (FIG. 5). The composite pipe 10 (the earth and sand transfer pipe 12 and the water supply pipe 14) is towed with its V-shaped open side facing forward, and the wire 29 includes a central connecting pipe 15 as necessary. It is connected to an appropriate location of the earth and sand transfer pipe 12. Reference numeral 31 denotes a plurality of eye plates for suspending the entire apparatus (FIG. 1). A plurality of eye plates 31 are provided at appropriate positions in the longitudinal direction of the earth and sand transfer pipe 12.

以下、上記のように構成したけん引式水底土砂除去装置Mを用いて行う水底土砂除去工法を説明する。   Hereinafter, the bottom sediment removal method performed using the towed bottom sediment removal apparatus M configured as described above will be described.

本水底土砂除去装置Mにより水底土砂を除去するには、予め土砂移送管12の両端の連結部材30に陸域に据付けたウインチ、望ましくはオートテンションウインチから延ばしたワイヤ29を連結し、さらに土砂移送管12の中央の吸引ポンプ19に土砂排送ホース18を、給水管14の中央の管継手21に給水ポンプから延ばした給水ホースをそれぞれ接続する。そして、前記準備完了後、土砂移送管12に設けたアイプレート31を利用して装置全体を、例えば、台船上のクレーンで吊り上げ、これを目的とする位置まで搬送し、その位置でクレーン操作により装置全体を水底の堆積土砂28上に降ろす。   In order to remove the bottom sediment by the bottom sediment removal apparatus M, a winch installed on the land area, preferably a wire 29 extended from an auto tension winch, is connected to the connecting members 30 at both ends of the sediment transport pipe 12 in advance. The earth and sand discharge hose 18 is connected to the suction pump 19 at the center of the transfer pipe 12, and the water supply hose extended from the water supply pump is connected to the pipe joint 21 at the center of the water supply pipe 14. Then, after the preparation is completed, the entire apparatus is lifted by, for example, a crane on a trolley using an eye plate 31 provided on the earth and sand transfer pipe 12, and is transported to a target position. The entire apparatus is lowered onto the sedimentary sediment 28 at the bottom of the water.

次に、吸引ポンプ19および給水ポンプを作動させる。すると、吸引ポンプ19の作動により土砂移送管12内にその両端から中央に向かう水流が発生し、ベルヌーイの定理により土砂流入口11(第1の土砂流入口11a、第2の土砂流入口11b)から土砂移送管12内に土砂28が流入し、この土砂は管内の水流に乗って中央の土砂流出口17から吸引ポンプ19を経て土砂排送ホース18へ移送される。一方、給水ポンプの作動により給水管14に加圧水が供給され、この加圧水は第1の枝管22と第2の枝管23とに分流して、第1の水噴出口13aから下方向へ、第2の水噴出口13bから水平方向へそれぞれ水ジェットとして噴射される。そして、下方向への水ジェットにより土砂移送管12の下側の堆積土砂28が流動化し、この流動化した土砂28は、主として下部に開口する第1の土砂流入口11aから土砂移送管12内に流入し、前記した管内の水流に乗って移送される。これにより土砂移送管12の下側の水底に窪みが形成されるが、この窪みの周辺の土砂が該窪み内に崩落して流動化し、主として第1の土砂流入口11aから土砂移送管12内に流入し、同様に移送される。なお、前記した周辺土砂の崩落は、水平方向への水ジェットにより促進され、崩落中の土砂の一部は、側部に開口する第2の土砂流入口11bから土砂移送管12内へ流入する。このようにして土砂移送管12(複合管10)の下方の堆積土砂28が除去され、土砂移送管12は次第に沈降(自沈)する。この自沈は、下層になるほど地盤は圧密され締まった状態となっているので、やがて停止し、これにより複合管10は堆積土砂28中に沈設された状態となる。   Next, the suction pump 19 and the water supply pump are operated. Then, by the operation of the suction pump 19, a water flow is generated in the sediment transport pipe 12 from both ends toward the center, and the sediment inlet 11 (first sediment inlet 11a, second sediment inlet 11b) by Bernoulli's theorem. The earth and sand 28 flows into the earth and sand transfer pipe 12 from the central earth and sand outlet 17 through the suction pump 19 and is transferred to the earth and sand discharge hose 18 along the water flow in the pipe. On the other hand, pressurized water is supplied to the feed water pipe 14 by the operation of the feed water pump, and this pressurized water is divided into the first branch pipe 22 and the second branch pipe 23, and downward from the first water jet 13a. Each of the water jets is ejected in the horizontal direction from the second water jet 13b. Then, the sedimentary sediment 28 below the sediment transport pipe 12 is fluidized by the water jet in the downward direction, and the fluidized sediment 28 is mainly introduced into the sediment transport pipe 12 from the first sediment inflow port 11a that opens downward. And is carried on the water flow in the pipe. As a result, a depression is formed in the bottom of the sediment transfer pipe 12, but the sediment around the depression collapses into the depression and is fluidized, mainly from the first sediment inlet 11a into the sediment transfer pipe 12. And is transferred in the same way. The collapse of the surrounding sediment is promoted by a horizontal water jet, and a part of the collapsed sediment flows into the sediment transport pipe 12 from the second sediment inflow port 11b that opens to the side. . In this manner, the accumulated sediment 28 below the sediment transport pipe 12 (composite pipe 10) is removed, and the sediment transport pipe 12 gradually settles (self-sinks). Since this self-sinking is in a state where the ground is consolidated and tightened as the lower layer is reached, it will eventually stop, and the composite pipe 10 is thus set in the sedimentation earth 28.

本実施形態においては特に、土砂移送管12の下部に開口する第1の土砂流入口11aと給水管14の水噴出口13aとが複合管10の長手方向に交互に配置されているので、該第1の水噴出口13aから噴射された水ジェットにより流動化した土砂が、当該水噴出口13aに隣接する第1の土砂流入口11aから土砂移送管12内に円滑に流入し、土砂の除去効率が向上する。また、給水管14の第5の分岐管26を介して加圧流体の一部が土砂移送管12の端部内に導入されているので、土砂流入管12内の水流が加速され、土砂は効率よく移送される。   In the present embodiment, in particular, the first earth and sand inflow port 11a opening at the lower part of the earth and sand transport pipe 12 and the water jet outlet 13a of the water supply pipe 14 are alternately arranged in the longitudinal direction of the composite pipe 10, The earth and sand fluidized by the water jet injected from the first water jet 13a smoothly flows into the earth and sand transfer pipe 12 from the first earth and sand inlet 11a adjacent to the water jet 13a, and the earth and sand are removed. Efficiency is improved. In addition, since a part of the pressurized fluid is introduced into the end of the sediment transport pipe 12 through the fifth branch pipe 26 of the water supply pipe 14, the water flow in the sediment transport pipe 12 is accelerated, and the sediment is efficient. Well transported.

次に、上記した複合管10の沈設にタイミングを合せてウインチを作動させる。すると、本水底土砂除去装置Mの全体が陸域方向へけん引され、土砂移送管12(複合管10)が、そのV字形の開き側を前向きにして水底上で平行移動する。図3〜5は、この様子を示しており、この移動に応じて、移動方向前側の堆積土砂28が、水平方向への水ジェットにより解されて流動化しながら土砂移送管12の下側へ崩落し、この崩落途中で、土砂28の一部は側部に開口する第2の土砂流入口11bから土砂移送管12内へ流入する。また、土砂移送管12の下側へ崩落した土砂は、下方向への水ジェットによりさらに流動化して、下部に開口する第1の土砂流入口11aから土砂移送管12内に流入する。このように土砂移送管12内に流入した土砂は、吸引ポンプ19により土砂移送管12内に発生している水流に乗って土砂排送ホース18へ移送され、これによって土砂移送管12(複合管10)の移動方向前側の堆積土砂28は次第に除去される。   Next, the winch is operated in synchronism with the set-up of the composite pipe 10 described above. Then, the entire bottom sediment removal apparatus M is pulled in the land direction, and the sediment transport pipe 12 (composite pipe 10) moves parallel on the bottom with the V-shaped opening side facing forward. 3 to 5 show this state, and in accordance with this movement, the sediment 28 on the front side in the moving direction collapses to the lower side of the sediment transport pipe 12 while being dissolved and fluidized by the water jet in the horizontal direction. In the middle of the collapse, part of the earth and sand 28 flows into the earth and sand transfer pipe 12 from the second earth and sand inlet 11b that opens to the side. Moreover, the earth and sand collapsed to the lower side of the earth and sand transfer pipe 12 is further fluidized by the water jet in the downward direction, and flows into the earth and sand transfer pipe 12 from the first earth and sand inlet 11a opened at the lower part. In this way, the sediment flowing into the sediment transport pipe 12 is transported to the sediment transport hose 18 by the suction pump 19 along the water flow generated in the sediment transport pipe 12, and thereby the sediment transport pipe 12 (composite pipe). The sedimentation sediment 28 on the front side in the movement direction 10) is gradually removed.

本土砂除去装置Mは、ウインチにより連続してけん引されており、このけん引による土砂移送管12の平行移動に応じて水底の堆積土砂28が次第に除去され、その除去範囲が拡大する。しかして、本実施形態においては、土砂移送管12(複合管10)の中央に吸引ポンプ19を配置しているので、その左右の重量バランスがよくなり、けん引方式により土砂移送管12を安定して平行移動させることができる。また、土砂移送管12の上部側に給水管14を配置し、該給水管14から土砂移送管12内を貫通して下方へ延ばした枝管(第1の枝管)22の先端に水噴出口11(第1の水噴出口11a)を開口させているので、土砂移送管12を平行移動させる際、給水管14の枝管22の先端部にのみ土砂抵抗がかかるだけとなり、給水管14にかかる土砂抵抗が大きく低減して、土砂移送管12の移動が円滑となる。   The main earth and sand removing device M is continuously towed by a winch, and the sediment sediment 28 on the bottom of the water is gradually removed according to the parallel movement of the earth and sand transfer pipe 12 by this towing, and the removal range is expanded. Therefore, in this embodiment, since the suction pump 19 is arranged at the center of the earth and sand transfer pipe 12 (composite pipe 10), the right and left weight balance is improved, and the earth and sand transfer pipe 12 is stabilized by the towing method. Can be translated. In addition, a water supply pipe 14 is arranged on the upper side of the earth and sand transfer pipe 12, and water is sprayed on the tip of a branch pipe (first branch pipe) 22 that penetrates the earth and sand transfer pipe 12 from the water supply pipe 14 and extends downward. Since the outlet 11 (the first water jet outlet 11a) is opened, when the earth and sand transfer pipe 12 is translated, only earth and sand resistance is applied only to the tip of the branch pipe 22 of the water supply pipe 14, and the water supply pipe 14 Therefore, the earth and sand transfer pipe 12 can be moved smoothly.

本実施形態においては特に、給水管14の第2の水噴出口14bから噴射される水平方向の水ジェットによって移動方向前側の堆積土砂が解されるので、土砂移送管12にかかる土砂抵抗は大幅に低減し、土砂移送管12の平行移動はより一層円滑となる。   In the present embodiment, in particular, since the sediment deposited on the front side in the moving direction is unraveled by the horizontal water jet ejected from the second water ejection port 14b of the water supply pipe 14, the sediment resistance applied to the sediment transport pipe 12 is greatly increased. Therefore, the parallel movement of the sediment transport pipe 12 becomes even smoother.

また、土砂移送管12が吸引ポンプ19の配置部位を中心としてV字形をなしているので、その移動方向前側の土砂が土砂移送管の傾斜に沿って中央側に集まり易くなる。すなわち、土砂移送管12の両端周辺に土砂が集まって堆積することはなくなり、この結果、土砂移送管12にかかる土砂抵抗は低減し、この面からも土砂移送管12の平行移動は円滑となる。また、中央側に土砂が集まることで、土砂移送管12の移動範囲内の土砂の取り残しが少なくなる。さらに、土砂移送管12をV字形とすることで、装置全体の水底への座りがよくなり、けん引時の姿勢が安定する。   Moreover, since the earth and sand transfer pipe 12 is V-shaped centering on the arrangement | positioning site | part of the suction pump 19, the earth and sand of the moving direction front side tends to gather on the center side along the inclination of the earth and sand transfer pipe. That is, the sediment does not collect and accumulate around both ends of the sediment transport pipe 12, and as a result, the sediment resistance applied to the sediment transport pipe 12 is reduced, and the parallel movement of the sediment transport pipe 12 is also smooth from this surface. . Moreover, since the earth and sand are collected on the center side, the remaining of the earth and sand within the moving range of the earth and sand transfer pipe 12 is reduced. Further, by making the earth and sand transfer pipe 12 V-shaped, the entire apparatus can sit on the bottom of the water, and the attitude during towing is stabilized.

また、ウインチとして、オートテンションウインチを用いた場合は、水底の土砂堆積状況により土砂移送管12にかかる土砂抵抗が変化しても、その土砂抵抗(ワイヤ29にかかる張力)に応じて土砂移送管12の移動速度が自動的に調整され、結果として取り残しが著しく少なくなる。また、土砂移送管12に過度なけん引力が加わることがなくなるので、けん引用ワイヤ29の断線などのトラブルもなくなり、安全性が向上する。   When an auto tension winch is used as the winch, even if the earth and sand resistance applied to the earth and sand transfer pipe 12 changes depending on the sediment accumulation state on the bottom of the water, the earth and sand transfer pipe is changed according to the earth and sand resistance (tension applied to the wire 29). The twelve moving speeds are automatically adjusted, resulting in significantly less leftovers. In addition, since excessive traction force is not applied to the earth and sand transfer pipe 12, troubles such as disconnection of the citation wire 29 are eliminated, and safety is improved.

なお、本水底土砂除去装置Mをけん引用ワイヤ29により安定してけん引するには、水底を這わせる状態で該ワイヤ29を延ばす必要がある。このため、例えば、図6に示すように、直立形式の護岸(陸域)35にウインチ(オートテンションウインチ)36を据付ける場合は、図示のように護岸35の前面の水底部に滑車37を設置し、ウインチ36から引出したワイヤ29を該滑車37で方向変換して水底を這わせる状態として本水底土砂除去装置Mに連結する。   In addition, in order to tow this water bottom sediment removal apparatus M stably with the towing wire 29, it is necessary to extend the wire 29 in a state where the water bottom is turned. Therefore, for example, as shown in FIG. 6, when installing a winch (auto tension winch) 36 on an upright type revetment (land area) 35, a pulley 37 is attached to the bottom of the water in front of the revetment 35 as shown in the figure. It is installed, and the wire 29 pulled out from the winch 36 is changed in direction by the pulley 37 and is connected to the main bottom sediment removal apparatus M in a state where the bottom is turned.

ここで、上記実施形態においては、給水管14から土砂移送管12の周面に沿って下方へ延ばした第2の枝管23の先端部に第2の水噴出口13bを設けたが、この第2の水噴出口13bは省略してもよいものである。ただし、第2の水噴出口13bを省略する場合は、図7に示すように、けん引方向に向けられた土砂移送管12の側部に、その長手方向に沿って櫛歯状に突起40を設けるのが望ましい、この場合は、該突起40によってけん引方向前側の土砂が解されるので、上記実施形態と同様に土砂移送管12の平行移動が円滑となり、その上、給水管14から第2の枝管23を省略する分、給水管14の構造が簡単となり、その製作に要するコストも低減する。   Here, in the said embodiment, although the 2nd water jet 13b was provided in the front-end | tip part of the 2nd branch pipe 23 extended below along the surrounding surface of the sediment transport pipe 12 from the water supply pipe 14, The second water jet 13b may be omitted. However, in the case of omitting the second water jet port 13b, as shown in FIG. 7, the protrusion 40 is formed in a comb-teeth shape along the longitudinal direction on the side portion of the earth and sand transfer pipe 12 oriented in the traction direction. In this case, it is preferable to provide the earth and sand in the traction direction by the projection 40, so that the parallel movement of the earth and sand transfer pipe 12 becomes smooth as in the above-described embodiment. Since the branch pipe 23 is omitted, the structure of the water supply pipe 14 is simplified, and the cost required for its production is reduced.

本水底土砂除去装置Mはまた、図8に示すように、上記複合管10に、吊り部材(吊りワイヤ)41を介してフロート42を連結し、該フロート42により装置全体を浮かせて土砂除去域に搬入・出できるようにしてもよいものである。この場合、フロート42として遠隔操作により浮力を調整可能な浮力調整機構を付加し、または吊り部材41に遠隔操作により長さ調整可能な長さ調整機構を付加することで、土砂除去域でフロート42の浮力または吊り部材41の長さを遠隔操作により調整して、装置全体を沈降および浮上させるようにするのが望ましい。このように構成した場合は、土砂除去域への装置の搬入・出が容易となるので、陸域から離れた沖合での土砂除去作業も容易となる。また、複合管10をフロート42の浮力または吊り部材41の長さを調整することにより一定水深以浅に保持することで、一定水深以浅の水底の堆積土砂のみを除去する浚渫も可能になり、利用価値が高まる。   As shown in FIG. 8, the present bottom sediment removal apparatus M also connects a float 42 to the composite pipe 10 via a suspension member (suspension wire) 41, and floats the entire apparatus by the float 42, thereby removing a sediment removal area. It may be possible to carry in and out. In this case, by adding a buoyancy adjustment mechanism capable of adjusting the buoyancy by remote operation as the float 42, or by adding a length adjustment mechanism capable of adjusting the length by remote operation to the suspension member 41, the float 42 in the sediment removal area. It is desirable to adjust the buoyancy or the length of the suspension member 41 by remote control so that the entire apparatus sinks and floats. When configured in this manner, it is easy to carry the device into and out of the sediment removal area, and therefore, the sediment removal work offshore away from the land area is facilitated. In addition, by holding the composite pipe 10 below a certain depth by adjusting the buoyancy of the float 42 or the length of the suspension member 41, it becomes possible to remove only sediment sediment at the bottom of the depth below the certain depth. Value increases.

本発明の1つの実施形態としてのけん引式水底土砂除去装置の全体構造を示す平面図である。It is a top view which shows the whole structure of the tow-type water bottom sediment removal apparatus as one Embodiment of this invention. 本水底土砂除去装置の全体構造を示す正面図である。It is a front view which shows the whole structure of this bottom sediment removal apparatus. 本水底土砂除去装置を構成する複合管の構造と使用状態とを示す断面図である。It is sectional drawing which shows the structure and use condition of the composite pipe which comprise this water bottom sediment removal apparatus. 本水底土砂除去装置を構成する複合管の構造と使用状態とを、図3と別断面で示す断面図である。It is sectional drawing which shows the structure and use condition of the composite pipe which comprise this water bottom sediment removal apparatus in a different cross section from FIG. 本水底土砂除去装置を構成する複合管の構造と使用状態とを示す側面図である。It is a side view which shows the structure and use condition of the composite pipe which comprise this water bottom sediment removal apparatus. 本水底土砂除去装置に対するけん引用ワイヤの連結状態の一例を示す模式図である。It is a schematic diagram which shows an example of the connection state of the citation wire with respect to this water bottom sediment removal apparatus. 本けん引式水底土砂除去装置の他の実施形態における複合管の構造と使用状態とを示す断面図である。It is sectional drawing which shows the structure and use condition of the composite pipe | tube in other embodiment of this towing type | formula bottom sediment removal apparatus. 本けん引式水底土砂除去装置の、さらに他の実施形態を示す正面図である。It is a front view which shows other embodiment of this towing type | formula bottom sediment removal apparatus. 従来の水底土砂除去装置の構造と使用状態とを示す断面図である。It is sectional drawing which shows the structure and use condition of the conventional water bottom sediment removal apparatus.

符号の説明Explanation of symbols

10 複合管
11(11A,11B) 土砂流入口
12 土砂移送管
13(13A,13B) 水噴出口
14 給水管
19 吸引ポンプ
22〜26 給水管の枝管
29 けん引用ワイヤ
30 ワイヤの連結部材
35 護岸(陸域)
36 ウインチ
40 櫛歯状突起
41 吊り部材
42 フロート
DESCRIPTION OF SYMBOLS 10 Composite pipe 11 (11A, 11B) Sediment inlet 12 Sediment transfer pipe 13 (13A, 13B) Water outlet 14 Water supply pipe 19 Suction pump 22-26 Branch pipe of water supply pipe 29 Token wire 30 Wire connection member 35 Seawall (Land area)
36 winch 40 comb-like projection 41 suspension member 42 float

Claims (9)

複数の土砂流入口が長手方向に配設された土砂移送管と複数の水噴出口が長手方向に配設された給水管とを並設してなる複合管を水底の堆積土砂中に沈設し、前記土砂移送管に搭載した吸引ポンプにより該土砂移送管内に水流を発生させると共に、前記水噴出口から水ジェットを噴出させて、前記土砂流入口から土砂移送管内に土砂を流入させ、かつ該土砂を前記水流に乗せて外部へ排出する水底土砂除去装置において、前記吸引ポンプを前記土砂移送管の中央に配置すると共に、前記給水管を前記土砂移送管の上部側に配置し、前記給水管の水噴出口は、該給水管から前記土砂移送管内を貫通して下方へ延ばした枝管の先端に開口させ、かつけん引方式により前記土砂移送管を水底上で平行移動させることを特徴とするけん引式水底土砂除去装置。   A composite pipe consisting of a sediment transfer pipe with a plurality of sediment inlets arranged in the longitudinal direction and a water supply pipe with a plurality of water jet outlets arranged in the longitudinal direction is submerged in the sediment at the bottom of the water. A water flow is generated in the earth and sand transfer pipe by a suction pump mounted on the earth and sand transfer pipe, a water jet is jetted from the water outlet, and the earth and sand is allowed to flow into the earth and sand transfer pipe from the earth and sand inlet. In the bottom sediment removal apparatus for discharging sediment to the outside by placing the sediment on the water flow, the suction pump is disposed at the center of the sediment transport pipe, the water supply pipe is disposed on the upper side of the sediment transport pipe, and the water supply pipe The water jet outlet is opened at the tip of a branch pipe extending downward from the water supply pipe through the earth and sand transfer pipe, and the earth and sand transfer pipe is translated on the bottom of the water by a caulking method. Towable bottom sediment removal Apparatus. 土砂流入口が、土砂移送管の少なくとも下部に設けられており、該土砂流入口と給水管の水噴出口とが、複合管の長手方向に交互に配列されることを特徴とする請求項1に記載のけん引式水底土砂除去装置。   The sediment inlet is provided at least in the lower part of the sediment transport pipe, and the sediment inlet and the water outlet of the water supply pipe are alternately arranged in the longitudinal direction of the composite pipe. The towing-type bottom sediment removal apparatus described in 1. けん引方向に向けられた土砂移送管の側部に沿って複数の第2の水噴出口を配設し、該第2の水噴出口は、給水管から該土砂移送管の周面に沿って下方へ延ばした第2の枝管の先端に開口させたことを特徴とする請求項1または2に記載のけん引式水底土砂除去装置。   A plurality of second water jets are disposed along the side of the earth and sand transfer pipe directed in the towing direction, and the second water jets are provided along the peripheral surface of the earth and sand transfer pipe from the water supply pipe. 3. The towing-type bottom sediment removal apparatus according to claim 1 or 2, wherein an opening is provided at the tip of the second branch pipe extending downward. けん引方向に向けられた土砂移送管の側部に、その長手方向に沿って櫛歯状に突起を設けたことを特徴とする請求項1または2に記載のけん引式水底土砂除去装置。   The towing-type bottom sediment removal apparatus according to claim 1 or 2, wherein protrusions are provided in a comb-like shape along a longitudinal direction of a side portion of the earth-and-sand transport pipe directed in the towing direction. 土砂移送管が、吸引ポンプの配置部位を中心にV字形をなし、該V字形の開き側を前向きにしてけん引されることを特徴とする請求項1乃至4の何れか1項に記載のけん引式水底土砂除去装置。   The towing according to any one of claims 1 to 4, wherein the earth and sand transfer pipe is towed with a V-shaped centering on a portion where the suction pump is disposed, and the open side of the V-shaped is directed forward. Water bottom sediment removal device. 複合管に、吊り部材を介してフロートを連結し、前記フロートの浮力または前記吊り部材の長さを遠隔操作により調整可能としたことを特徴とする請求項1乃至5の何れか1項に記載のけん引式水底土砂除去装置。   The float is connected to the composite pipe via a suspension member, and the buoyancy of the float or the length of the suspension member can be adjusted by remote operation. Towing-type bottom sediment removal equipment. 請求項1乃至6の何れか1項に記載の水底土砂除去装置を水底の堆積土砂中に沈設し、吸引ポンプにより土砂移送管内に水流を起こしかつ給水管の水噴出口から水ジェットを噴出させながら、該水底土砂除去装置をけん引して土砂移送管を水底上で平行移動させることを特徴とするけん引式水底土砂除去工法。   The bottom sediment removal apparatus according to any one of claims 1 to 6, wherein the water bottom sediment removal apparatus is set in the sediment sediment on the bottom, a water flow is generated in the sediment transport pipe by a suction pump, and a water jet is ejected from a water outlet of the water supply pipe. However, the towing-type bottom sediment removal method characterized by towing the bottom sediment removal apparatus and translating the sediment transport pipe on the bottom. 水底土砂除去装置を、陸域に据付けたけん引手段によりけん引することを特徴とする請求項7に記載のけん引式水底土砂除去工法。   The towing-type bottom sediment removal method according to claim 7, wherein the bottom sediment removal apparatus is towed by a towing means installed in a land area. けん引手段として、オートテンションウインチを用いることを特徴とする請求項8に記載のけん引式水底土砂除去工法。   9. The towing-type bottom sediment removal method according to claim 8, wherein an automatic tension winch is used as the towing means.
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