JP6569980B2 - Water bottom leveling device for pump dredger and water bottom leveling method using the same - Google Patents

Water bottom leveling device for pump dredger and water bottom leveling method using the same Download PDF

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JP6569980B2
JP6569980B2 JP2015173549A JP2015173549A JP6569980B2 JP 6569980 B2 JP6569980 B2 JP 6569980B2 JP 2015173549 A JP2015173549 A JP 2015173549A JP 2015173549 A JP2015173549 A JP 2015173549A JP 6569980 B2 JP6569980 B2 JP 6569980B2
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喬平 長尾
喬平 長尾
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Penta Ocean Construction Co Ltd
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本発明は、ポンプ浚渫船によって港湾等の水底部を浚渫した際に、水底部を均一に均す為のポンプ浚渫船用水底均し装置及びそれを使用した水底均し方法に関する。   TECHNICAL FIELD The present invention relates to a water leveling device for a pump dredger and a water bottom leveling method using the same for leveling a water bottom when a water bottom is dredged by a pump dredger.

従来、港湾等の水底部を浚渫する方法としては、ポンプ浚渫船を使用した浚渫方法が知られている(例えば、特許文献1を参照)。   Conventionally, a dredging method using a pump dredger has been known as a dredging method for dredging the bottom of a port or the like (for example, see Patent Document 1).

ポンプ浚渫船1は、図9、図10に示すように、浚渫船本体2から先端側を水底部Aに向けて水中に挿入されるラダー3と、浚渫船本体2とともにラダー3を旋回させる旋回手段4と、ラダー3先端部に配置された掘削手段5と、ラダー3先端部に吸引口6aを開口させた排砂管路6と、排砂管路6に接続された吸引ポンプ7とを備えている。   As shown in FIGS. 9 and 10, the pump dredger 1 includes a ladder 3 that is inserted into the water from the dredger main body 2 with the tip side toward the water bottom A, and a turning means 4 that rotates the ladder 3 together with the dredger main body 2. The excavating means 5 disposed at the tip of the ladder 3, the sand discharge pipe 6 having the suction port 6 a opened at the tip of the ladder 3, and the suction pump 7 connected to the sand discharge pipe 6 are provided. .

浚渫船本体2は、船尾部に上下方向に向けた杭状のスパット8,8を備え、一方のスパット8を水底部Aに打ち込み、それを支点としてラダー3とともに水平方向に旋回(スイング)できるとともに、旋回動作に合わせて一方のスパット8を軸に他方のスパット8を移動させる工程と、他方のスパット8を軸に一方のスパットを移動させる工程とを繰り返すこと(以下、スパットの打ち替えという)により前進できるようになっている。   The dredger main body 2 is provided with pile-shaped spats 8 and 8 directed in the vertical direction at the stern part, and one of the spats 8 is driven into the bottom A, and can be swung in the horizontal direction together with the ladder 3 using the spat 8 as a fulcrum. , Repeating the step of moving the other spat 8 about the one spat 8 as an axis, and the step of moving the one spat about the other spat 8 in accordance with the turning operation (hereinafter referred to as “changing the spat”). You can move forward.

図中符号4aは、旋回手段4を構成する旋回用ワイヤであって、船首部に設けられた各ウインチ(図示せず)で旋回用ワイヤ4a,4aを繰り出し・巻き取り動作することにより、スパット8を支点としてラダー3を浚渫船本体2とともに水平方向に旋回(スイング)させるようになっている。   Reference numeral 4a in the figure denotes a turning wire that constitutes the turning means 4, and the turning wires 4a and 4a are fed and taken up by each winch (not shown) provided at the bow, so that the spat The ladder 3 is swung in the horizontal direction together with the dredger body 2 with 8 as a fulcrum.

ラダー3は、その基端部を浚渫船本体2の船首部に枢支軸3aを介して上下に回動可能に支持させ、その先端側が昇降手段9により上下動するようになっている。   The rudder 3 has a base end portion supported on the bow portion of the dredger main body 2 so as to be pivotable up and down via a pivot shaft 3 a, and a tip end side thereof is moved up and down by an elevating means 9.

昇降手段9は、浚渫船本体2の船首部に設置された支柱10の上端部より繰り出されたラダー操作用ワイヤ11,11を備え、ラダー操作用ワイヤ11,11の先端をラダー3の先端部及び中央部にそれぞれ連結させ、浚渫船本体2上に搭載されたウインチ(図示せず)によりラダー操作用ワイヤ11,11を繰り出し・巻き取り動作することにより枢支軸3aを基軸としてラダー3の先端側を上下動させるようになっている。   The elevating means 9 includes ladder operation wires 11 and 11 that are fed from the upper end of a column 10 installed at the bow of the dredger body 2, and the tips of the ladder operation wires 11 and 11 are connected to the tip of the ladder 3 and The ladder operation wires 11 and 11 are fed out and wound up by a winch (not shown) mounted on the dredger main body 2 by being respectively connected to the central portion, and the leading end side of the ladder 3 with the pivot shaft 3a as a base axis. Is designed to move up and down.

掘削手段5は、ラダー3先端部に回転自在に支持されたカッターを備え、このカッターを図示しない駆動モータにより回転させることにより水底部Aの土砂を掘削するようになっている。   The excavation means 5 includes a cutter that is rotatably supported at the tip of the ladder 3, and the earth and sand in the water bottom A is excavated by rotating the cutter with a drive motor (not shown).

また、ラダー3内には、可撓性を有するホース等からなる排砂管路6が配管されており、排砂管路6の一方の端部が吸引口6aとしてラダー3先端部に配置され、掘削手段5により掘削された土砂がこの吸引口6aより周囲の水とともに排砂管路6を通して吸引ポンプ7により吸引されるようになっている。   Further, in the ladder 3, a sand discharge pipe 6 made of a flexible hose or the like is piped, and one end of the sand discharge pipe 6 is disposed at the tip of the ladder 3 as a suction port 6a. The earth and sand excavated by the excavating means 5 is sucked by the suction pump 7 through the sand discharge pipe 6 together with the surrounding water from the suction port 6a.

このポンプ浚渫船1による浚渫作業は、スパット8を水底部Aに打ち込み、このスパット8を軸に浚渫船本体2とともにラダー3を旋回させつつラダー3先端の掘削手段5により水底部Aの土砂を掘削し、その掘削した土砂を周囲の海水とともに排砂管路6を通して吸引ポンプ7により吸い上げ、ポンプ圧送により土捨て場に直接移送する作業(以下、ポンプ浚渫工程)をポンプ浚渫船1の移動毎に繰り返すようになっている。   The dredging operation by the pump dredger 1 is carried out by driving a spat 8 into the bottom A, turning the rudder 3 together with the dredger main body 2 around the spat 8 and excavating the earth and sand of the bottom A by the excavating means 5 at the tip of the ladder 3. Then, the excavated earth and sand together with surrounding seawater is sucked up by the suction pump 7 through the drainage pipe 6 and transferred directly to the dumping site by pumping (hereinafter referred to as pump dredging process) so as to be repeated every time the pump dredger 1 moves. It has become.

しかしながら、このようなポンプ浚渫船1による浚渫作業では、各ポンプ浚渫工程後にポンプ浚渫船1を移動させることで、ポンプ浚渫により形成された旋回方向に連続する溝状の浚渫溝の浚渫船移動方向手前側に凸部が生じ、ポンプ浚渫船の移動方向に不陸が生じる。   However, in such dredging work by the pump dredger 1, the pump dredger 1 is moved after each pump dredging process, so that the grooved dredging groove formed by the pump dredger continues in the dredger movement direction on the front side. Protrusions occur and unevenness occurs in the direction of movement of the pump dredger.

そこで、従来では、図11に示すように、浚渫作業で生じる不陸を考慮し、設定された計画浚渫深度DTよりも余裕を持たせて掘削すること、即ち、余掘りをすることによって浚渫後の計画浚渫深度を確保していた。尚、図中符号D0は現地盤深度である。   Therefore, conventionally, as shown in FIG. 11, in consideration of the unevenness caused by dredging work, excavation with a margin more than the set planned dredging depth DT, that is, by excavating further after dredging The planned dredging depth was secured. In addition, the code | symbol D0 in a figure is a local board depth.

また、グラブバケット等を用いた浚渫工法で生じる不陸に対しては、浚渫船とは別個に作業船を用意し、この作業船下にH型鋼等からなる均し具を吊り下ろして着底させ、この均し具を作業船の移動とともに水底部を移動させることによって水底部を均一に仕上げる工法も知られている(例えば、特許文献2を参照)。   In addition, for unevenness caused by dredging methods using grab buckets, etc., a work ship is prepared separately from the dredger, and a leveling tool made of H-shaped steel or the like is suspended under the work ship and allowed to bottom. There is also known a construction method for uniformly finishing the bottom of the water by moving the water bottom along with the movement of the work boat (see, for example, Patent Document 2).

特開平10―280468号公報Japanese Patent Laid-Open No. 10-280468 特開2012−92561号公報JP 2012-92561 A

しかしながら、現在、浚渫土量に対して土捨て場が慢性的に不足している状況にあることから、浚渫土量を最小限に抑えるために余掘り量の低減が望まれているのに対し、上述の如き従来のポンプ浚渫船による浚渫作業では、浚渫後の水底面の不陸を考慮して実際の浚渫深度に目標浚渫深度より余裕を持たせたことにより、余計な部分の土砂までも余掘りせざるを得ないという問題があった。   However, because there is currently a chronic shortage of dumping sites for dredged soil volume, it is desirable to reduce the amount of overburden to minimize dredged soil volume. In the dredging work by the conventional pump dredger as described above, the actual dredging depth is given more than the target dredging depth in consideration of the unevenness of the bottom surface of the dredging. There was a problem of having to dig.

一方、上述した従来の均し作業は、ポンプ浚渫と同時進行で均し作業を行うことが出来ず、その為、ポンプ浚渫船とは別個に均し作業用の作業船を必要とし、浚渫作業と均し作業とを別の時間帯で行わなければならない為、その分、工期が長期化するとともに工費が嵩むという問題があった。   On the other hand, the above-described conventional leveling work cannot be carried out simultaneously with the pump dredging, and therefore requires a work ship for leveling work separately from the pump dredger. Since the leveling work must be performed in a different time zone, there was a problem that the construction period was prolonged and the construction cost increased.

そこで、本発明は、このような従来の問題に鑑み、ポンプ浚渫船を使用した浚渫作業において、余掘り量の低減を図れ、且つ、効率的に水底部を均すことができるポンプ浚渫船用水底均し装置及びそれを使用した水底均し方法の提供を目的としてなされたものである。   Therefore, in view of such a conventional problem, the present invention can reduce the amount of overburden in dredging work using a pump dredger and can evenly level the bottom of a pump dredger. The purpose of this invention is to provide a water leveling method and a water bottom leveling method using the same.

上述の如き従来の問題を解決するための請求項1に記載の発明の特徴は、浚渫船本体から先端側を水底部に向けて水中に挿入されるラダーと、該ラダーを旋回させる旋回手段と、該ラダー先端部に配置された掘削手段と、前記ラダー先端部に吸引口を開口させた排砂管路と、該排砂管路に接続された吸引ポンプとを備えたポンプ浚渫船にあって、掘削された水底部を均す為のポンプ浚渫船用水底均し装置において、前記ラダーの側部に支持体を介して支持された均し具を備え、該均し具の土砂押圧面が前記ラダーの旋回方向に向けられているポンプ浚渫船用水底均し装置にある。   The features of the invention according to claim 1 for solving the conventional problems as described above are: a ladder that is inserted into the water from the dredger main body toward the bottom of the water, and a turning means for turning the ladder; A pump dredger comprising excavation means disposed at the tip of the ladder, a sand discharge pipe having a suction port opened at the ladder tip, and a suction pump connected to the sand discharge pipe, A water leveling device for a pump dredger for leveling an excavated water bottom, comprising a leveling tool supported on a side of the ladder via a support, and the earth and sand pressing surface of the leveling tool being the ladder The water leveling device for pump dredgers is oriented in the swivel direction.

請求項2に記載の発明の特徴は、請求項1の構成に加え、前記ラダーの先端位置を検知するラダー位置計測手段と、前記ラダー位置計測手段の検知結果に基づき、水底面に対する前記均し具の高さ及び傾斜角を調整する調節手段とを備えていることにある。
According to a second aspect of the present invention, in addition to the configuration of the first aspect, a ladder position measuring means for detecting a tip position of the ladder, and the leveling with respect to the water bottom surface based on a detection result of the ladder position measuring means. And adjusting means for adjusting the height and inclination angle of the tool.

請求項3に記載の発明の特徴は、請求項1又は2の構成に加え、前記支持体は、前記ラダーの側面より外向きに張り出した形状に形成され、前記均し具が前記ラダー側面より距離を置いて支持されていることにある。   According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the support is formed in a shape projecting outward from the side surface of the ladder, and the leveling tool is formed from the side surface of the ladder. It is supported at a distance.

請求項4に記載の発明の特徴は、浚渫船本体から水底部に向けて水中に挿入したラダーを旋回させつつ、ラダー先端部に配置された掘削手段で水底部を掘削し、その掘削した土砂を周囲の海水とともに排砂管路を通して除去するポンプ浚渫工程を前記浚渫船本体の移動毎に繰り返すに際し、前記ラダーの側部に支持体を介して土砂押圧面を旋回方向に向けた均し具を取り付け、該均し具を水底部で前記ラダーの旋回に連動してラダー旋回方向に移動させ、既に前記ポンプ浚渫工程を終えた水底部を平坦に均す均し工程を前記ポンプ浚渫工程と同時に行う水底均し方法にある。   The feature of the invention described in claim 4 is that the rudder inserted in the water is swung from the dredger main body toward the bottom of the water, and the bottom of the water is excavated by the excavating means disposed at the tip of the rudder. When repeating the dredging process with the surrounding seawater through the sand discharge pipe every time the dredger body moves, a leveling tool with the earth and sand pressing surface facing the turning direction is attached to the side of the ladder via a support. The leveling step is carried out simultaneously with the pump dredging step by moving the leveling tool in the rudder swiveling direction in conjunction with the rudder swivel at the bottom of the water and leveling the bottom of the water already finished with the pump dredging step. It is in the water bottom leveling method.

請求項5に記載の発明の特徴は、請求項4の構成に加え、一対の前記均し具を前記ラダーの両側にそれぞれ高さを違えて支持させたことにある。   According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the pair of leveling tools are supported on both sides of the ladder with different heights.

請求項6に記載の発明の特徴は、請求項4又は5の構成に加え、前記均し具を前記ラダーの側面より距離を置いて支持させ、前記掘削手段による掘削幅の外側まで水底部を均すことにある。   According to a sixth aspect of the present invention, in addition to the configuration of the fourth or fifth aspect, the leveling tool is supported at a distance from the side surface of the ladder, and the water bottom is extended to the outside of the excavation width by the excavation means. It is in leveling.

本発明に係るポンプ浚渫船用水底均し装置は、上述したように、浚渫船本体から先端側を水底部に向けて水中に挿入されるラダーと、該ラダーを旋回させる旋回手段と、該ラダー先端部に配置された掘削手段と、前記ラダー先端部に吸引口を開口させた排砂管路と、該排砂管路に接続された吸引ポンプとを備えたポンプ浚渫船にあって、掘削された水底部を均す為のポンプ浚渫船用水底均し装置において、前記ラダーの側部に支持体を介して支持された均し具を備え、該均し具の土砂押圧面が前記ラダーの旋回方向に向けられていることにより、ポンプ浚渫作業と同時に水底部の均し作業を行うことができる。   As described above, the water bottom leveling device for a pump dredger according to the present invention includes a ladder that is inserted into the water from the dredger body with the tip side directed toward the water bottom, a turning means for turning the ladder, and the ladder tip. In the pump dredger, the excavating means is provided with an excavating means, a sand discharge pipe having a suction opening at the tip of the ladder, and a suction pump connected to the sand discharge pipe. In a water leveling device for a pump dredger for leveling the bottom, the leveling device is provided with a leveling tool supported on a side of the ladder via a support, and the earth and sand pressing surface of the leveling tool is in the turning direction of the ladder. By being directed, the water bottom can be leveled simultaneously with the pump dredging.

また、本発明において、前記ラダーの先端位置を検知するラダー位置計測手段と、前記ラダー位置計測手段の検知結果に基づき、水底面に対する前記均し具の高さ及び傾斜角を調整する調節手段とを備えていることにより、潮位変動や波浪が発生し、ラダーの位置や傾斜角度に変動が生じた場合にあっても、均し具の高さを常に一定に維持することができ、高精度で計画した均し面を形成することができる。 Further, in the present invention, a ladder position measuring means for detecting the position of the tip of the ladder, and an adjusting means for adjusting the height and inclination angle of the leveling tool with respect to the bottom surface based on the detection result of the ladder position measuring means; The height of the leveling tool can be maintained at a constant level even when tide level fluctuations and waves occur and the ladder position and tilt angle fluctuate. It is possible to form the leveled surface planned in

更に、本発明において、前記支持体は、前記ラダーの側面より外向きに張り出した形状に形成され、前記均し具が前記ラダー側面より距離を置いて支持されていることにより、均し具がラダー先端部より旋回方向中心側に位置していても、掘削手段による掘削幅よりも広い範囲を均すことができ、均し漏れがない。   Furthermore, in the present invention, the support body is formed in a shape projecting outward from the side surface of the ladder, and the leveling tool is supported at a distance from the side surface of the ladder. Even if it is located closer to the center in the turning direction than the tip of the ladder, a range wider than the excavation width by the excavating means can be leveled and there is no leveling leakage.

また、本発明に係る水底均し方法は、上述したように、浚渫船本体から水底部に向けて水中に挿入したラダーを旋回させつつ、ラダー先端部に配置された掘削手段で水底部を掘削し、その掘削した土砂を周囲の海水とともに排砂管路を通して除去するポンプ浚渫工程を前記浚渫船本体の移動毎に繰り返すに際し、前記ラダーの側部に支持体を介して土砂押圧面を旋回方向に向けた均し具を取り付け、該均し具を水底部で前記ラダーの旋回に連動してラダー旋回方向に移動させ、既に前記ポンプ浚渫工程を終えた水底部を平坦に均す均し工程を前記ポンプ浚渫工程と同時に行うことにより、ポンプ浚渫工法において、ポンプ浚渫作業と同時に均し作業を行うことができ、均しにより実際の浚渫面を平坦にすることで、余計な余掘りをする必要がなくなるので、大幅に余掘り量を低減することができる。   Further, the water bottom leveling method according to the present invention, as described above, excavates the bottom of the water with the excavating means disposed at the tip of the ladder while turning the ladder inserted in the water from the dredger body toward the bottom of the water. When the pump dredging process for removing the excavated earth and sand along with the surrounding seawater through the sand discharge pipe is repeated for each movement of the dredger main body, the earth and sand pressing surface is turned in the swivel direction via the support on the side of the ladder. Attaching a leveling tool, moving the leveling tool in the rudder turning direction in conjunction with the turning of the ladder at the bottom of the water, and leveling the water bottom after finishing the pump dredging step flatly. By performing the pump dredging process simultaneously with the pump dredging process, it is possible to perform leveling work simultaneously with the pump dredging work, and it is necessary to further excavate by flattening the actual dredging surface by leveling. Since Kunar, it is possible to greatly reduce the outbreak amount.

また、本発明において、一対の前記均し具を前記ラダーの両側にそれぞれ高さを違えて支持させたことによって、旋回に伴い粗均しと仕上げ均しとを行うことができ、高精度で浚渫深度を管理することができる。   Further, in the present invention, the pair of leveling tools are supported on both sides of the ladder with different heights, so that it is possible to perform leveling and finishing leveling with turning, with high accuracy. Can manage dredging depth.

更に、本発明において、前記均し具を前記ラダーの側面より距離を置いて支持させ、前記掘削手段による掘削幅の外側まで水底部を均すことにより、掘削手段による掘削幅よりも広い範囲を均すことができ、均し漏れがないようにできる。   Further, in the present invention, the leveling tool is supported at a distance from the side surface of the ladder, and the water bottom is leveled to the outside of the excavation width by the excavation means, thereby widening the range wider than the excavation width by the excavation means. It can be leveled and there can be no leveling leakage.

本発明に係る水底均し装置を備えたポンプ浚渫船の概略を示す部分拡大側面図である。It is a partial expanded side view which shows the outline of the pump dredger provided with the water bottom leveling apparatus which concerns on this invention. 同上の部分拡大平面図である。It is a partial enlarged plan view same as the above. 図1中のラダー先端部を示す拡大側面図である。It is an enlarged side view which shows the ladder front-end | tip part in FIG. 同上のラダー先端部を示す拡大正面図である。It is an enlarged front view which shows a ladder front-end | tip part same as the above. 制御手段を示す概略図である。It is the schematic which shows a control means. 本発明に係る水底均し方法の手順を示すフローチャートである。It is a flowchart which shows the procedure of the water bottom leveling method which concerns on this invention. 本発明に係る水底均し方法の浚渫工程及び均し工程の概略を説明する為の平面図である。It is a top view for demonstrating the outline of the dredging process and leveling process of the water bottom leveling method which concerns on this invention. 本発明方法における水底部の状態を説明するための断面図である。It is sectional drawing for demonstrating the state of the water bottom part in the method of this invention. 従来のポンプ浚渫船の概略を示す側面図である。It is a side view which shows the outline of the conventional pump dredger. 同上の概略平面図である。It is a schematic plan view same as the above. 従来のポンプ浚渫船によって浚渫された水底部の断面図である。It is sectional drawing of the water bottom part dredged with the conventional pump dredger.

次に、本発明に係るポンプ浚渫船用水底均し装置の実施態様を図1〜図5に示した実施例に基づいて説明する。尚、上述した従来例と同様の構成には同一符号を付して説明する。また、図中符号1はポンプ浚渫船、符号Aは水底部、符号Bは水面である。   Next, an embodiment of a water bottom leveling device for a pump dredger according to the present invention will be described based on the examples shown in FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the prior art example mentioned above. In the figure, reference numeral 1 denotes a pump dredger, reference numeral A denotes a water bottom, and reference numeral B denotes a water surface.

ポンプ浚渫船1は、図9、図10に示す従来例と同様に、水上を移動可能な浚渫船本体2と、浚渫船本体2の船主側より水底部Aに向けて水中に挿入されたラダー3と、ラダー3を旋回動作させる旋回手段4と、ラダー3の先端部に配置されたカッター等の掘削手段5と、吸引口6aをラダー3先端部に開口させた排砂管路6と、排砂管路6に接続された吸引ポンプ7とを備え、浚渫船本体2とともにラダー3を旋回させつつラダー3先端の掘削手段5により水底の土砂を掘削し、その掘削した土砂を周囲の海水とともに排砂管路6を通して吸引ポンプ7により吸い上げ、ポンプ圧送により土捨て場に直接移送する作業をポンプ浚渫船1の移動毎に繰り返すようになっている。   As in the conventional example shown in FIGS. 9 and 10, the pump dredger 1 includes a dredger main body 2 that can move on the water, a ladder 3 that is inserted into the water from the shipowner side of the dredger main body 2 toward the bottom A, Turning means 4 for turning the ladder 3, excavation means 5 such as a cutter disposed at the tip of the ladder 3, a sand discharge pipe 6 having a suction port 6 a opened at the tip of the ladder 3, and a sand discharge pipe And a suction pump 7 connected to the path 6, while turning the ladder 3 together with the dredger main body 2, excavating the bottom sediment by the excavating means 5 at the tip of the ladder 3, and the excavated sediment together with surrounding sea water as a sand discharge pipe The operation of sucking up by the suction pump 7 through the path 6 and transferring directly to the dumping site by pumping is repeated every time the pump dredger 1 moves.

また、このポンプ浚渫船1には、水底均し装置20を具備し、浚渫作業と並行して浚渫作業を終えた部分の均し作業を同時に行えるようになっている。   Further, the pump dredger 1 is provided with a water bottom leveling device 20 so that the leveling operation of the portion where the dredging operation has been completed can be performed simultaneously with the dredging operation.

尚、図中符号21は、ポンプ浚渫船1の制御を行う制御室であり、制御室21内には制御装置22を構成するコンピュータ端末等が設置され、この制御装置22により水底均し装置20が自動制御できるようになっている。   Reference numeral 21 in the figure denotes a control room for controlling the pump dredger 1, and a computer terminal or the like constituting the control device 22 is installed in the control room 21, and the water leveling device 20 is controlled by the control device 22. It can be automatically controlled.

水底均し装置20は、図1〜4に示すように、ラダー3の側部に張り出した支持体23を介して支持させた均し具24a,24bを備え、この均し具24a,24bの土砂押圧面がラダー3の旋回方向に向けられ、ラダー3の旋回に伴って均し具24a,24bが水底部Aを移動し、ラダー3の旋回方向と平行に水底部Aを均すようになっている。   As shown in FIGS. 1 to 4, the water bottom leveling device 20 includes leveling tools 24 a and 24 b supported via a support 23 projecting from the side of the ladder 3, and the leveling tools 24 a and 24 b The earth and sand pressing surface is directed in the turning direction of the ladder 3, and the leveling tools 24 a and 24 b move along the bottom A with the turning of the ladder 3 so that the bottom A is leveled parallel to the turning direction of the ladder 3. It has become.

また、水底均し装置20には、ラダー3先端部の位置を計測するラダー位置計測手段25と、ラダー位置計測手段25の計測結果に基づき均し具24a,24bの高さ及び傾斜角度を調整する調節手段とを備え、ラダー位置計測手段25の検知結果に基づいて制御装置22により調節手段が制御されるようになっている。   In addition, the bottom leveling device 20 adjusts the height and the inclination angle of the ladder level measuring means 25 for measuring the position of the tip of the ladder 3 and the leveling tools 24a and 24b based on the measurement result of the ladder position measuring means 25. And adjusting means that is controlled by the control device 22 based on the detection result of the ladder position measuring means 25.

支持体23は、ラダー3の側面に基端が固定された一対の支持部材26,26と、各支持部材26,26の先端に支持された滑車27と、浚渫船本体2上に設置された調節用ウインチ28,28より繰り出された支持ワイヤ29とを備え、滑車27を介して垂下させた支持ワイヤ29の下端に均し具24a,24bが連結され、支持体23を介して均し具24a,24bをラダー3の側部に支持させている。   The support body 23 includes a pair of support members 26, 26 whose base ends are fixed to the side surface of the ladder 3, a pulley 27 supported at the tip of each support member 26, 26, and an adjustment installed on the dredger main body 2. Leveling tools 24a and 24b are connected to the lower end of the support wire 29 suspended from the pulley 27, and the leveling tool 24a is connected via the support 23. , 24b is supported on the side of the ladder 3.

支持部材26は、一定の長さを有する棒状に形成され、ラダー3側面より外向きに突出し、均し具24a,24bがラダー側面より距離を置いて支持されるようにしている。   The support member 26 is formed in a rod shape having a certain length, protrudes outward from the side surface of the ladder 3, and the leveling tools 24 a and 24 b are supported at a distance from the side surface of the ladder.

各均し具24a,24bは、水平方向に向けた土砂押出し面を備えた形状に形成され、本実施例では、H型鋼をもって構成し、上下フランジ30,30間を連結するウェブ31が土砂押圧面を成している。   Each of the leveling tools 24a and 24b is formed in a shape having a sand and sand extruding surface directed in the horizontal direction. In this embodiment, the leveling tool 24a and 24b is made of H-shaped steel, and the web 31 connecting the upper and lower flanges 30 and 30 is pressed against the sand Make up.

また、均し具24a,24bの上面には、長手方向に間隔を置いて一対の連結具32,32が溶接等により固定され、この連結具32,32に支持ワイヤ29の先端が連結され、均し具24a,24bが支持体23を介して高さ及び傾斜角度を調節可能にラダー3の側部に支持されている。   In addition, a pair of connecting tools 32, 32 are fixed to the upper surfaces of the leveling tools 24a, 24b at intervals in the longitudinal direction by welding or the like, and the tips of the support wires 29 are connected to the connecting tools 32, 32, The leveling tools 24a and 24b are supported on the side of the ladder 3 through the support 23 so that the height and the inclination angle can be adjusted.

調節手段には、浚渫船本体2上に設置された調節用ウインチ28,28を使用し、調節用ウインチ28,28によって各支持ワイヤ29を繰り出し又は巻き取り動作することにより均し具24a,24bの水底面に対する高さ及び傾斜角度を調整できるようになっている。   As the adjusting means, adjusting winches 28, 28 installed on the dredger body 2 are used, and the support wires 29 are fed out or wound up by the adjusting winches 28, 28, so that the leveling tools 24 a, 24 b are operated. The height and inclination angle with respect to the water bottom can be adjusted.

ラダー位置計測手段25には、ラダー3の位置制御に使用するものを兼用し、例えば、図5に示すように、ラダー3に設置された傾斜計33と、陸上に設置された潮位測定局から随時潮位計測データを受信する潮位受信機34とを備え、傾斜計33により計測された水平面に対するラダー3の傾斜角と、その際の潮位とをリアルタイムに制御装置22に出力するようになっている。   The ladder position measuring means 25 is also used for the position control of the ladder 3. For example, as shown in FIG. 5, an inclinometer 33 installed on the ladder 3 and a tide level measuring station installed on land are used. A tide level receiver 34 for receiving tide level measurement data at any time, and outputs the inclination angle of the ladder 3 with respect to the horizontal plane measured by the inclinometer 33 and the tide level at that time to the control device 22 in real time. .

次に、このようなポンプ浚渫船1及び水底均し装置20を使用した水底均し方法について図6〜図8に基づいて説明する。尚、図中符号D0は現水底地盤深度、符号40は本実施例のポンプ浚渫により形成される浚渫溝、符号41は従来工法のポンプ浚渫における浚渫溝である。   Next, a water bottom leveling method using such a pump dredger 1 and a water bottom leveling device 20 will be described with reference to FIGS. In the figure, symbol D0 is the depth of the current water bottom ground, symbol 40 is a trough formed by the pump trough of the present embodiment, and symbol 41 is a trough in the pump trough of the conventional method.

先ず、事前準備として、計画浚渫深度DT、計画浚渫範囲Wを設定し、そのデータを、制御装置22を構成するコンピュータ機器に入力しておく。   First, as a preliminary preparation, the planned dredging depth DT and the planned dredging range W are set, and the data is input to the computer equipment constituting the control device 22.

次に、ポンプ浚渫船1を所望の位置まで移動させ、その位置で一方のスパット8を水底部Aに向けて打ち込み、ポンプ浚渫船1の旋回基軸を確保する。   Next, the pump dredger 1 is moved to a desired position, and one of the spats 8 is driven toward the water bottom A at that position, and the pivot base shaft of the pump dredger 1 is secured.

そして、昇降手段9を動作させてラダー3を傾動させ、ラダー3の先端部を水底部Aに向けて水中に挿入し、ラダー3先端部の掘削手段5を水底部Aに降下させる。   And the raising / lowering means 9 is operated, the ladder 3 is tilted, the front-end | tip part of the ladder 3 is inserted in water toward the water bottom A, and the excavation means 5 of the ladder 3 front-end | tip part is dropped to the water bottom A.

その際、計画浚渫深度DTに対するラダー3先端部の深度は、従来の浚渫作業における計画浚渫深度DTに対するラダー3先端部の深度に比べて浅い位置に設定し、余掘り量を大幅に低減した状態で行う。   At that time, the depth of the tip of the ladder 3 with respect to the planned dredging depth DT is set at a shallow position compared to the depth of the tip of the ladder 3 with respect to the planned dredging depth DT in the conventional dredging operation, and the amount of overburden is greatly reduced. To do.

尚、ラダー3を傾動させる作業は、ラダー位置計測手段25によってラダー3先端部の実際の深さ及び位置を計測しつつ行い、制御装置22は、ラダー位置計測手段25による実際の計測データを基にラダー3を動作させ、ラダー3先端部の位置を計画浚渫深度DTに合わせて制御する。   The operation of tilting the ladder 3 is performed while measuring the actual depth and position of the tip of the ladder 3 by the ladder position measuring means 25, and the control device 22 is based on the actual measurement data by the ladder position measuring means 25. The ladder 3 is operated to control the position of the tip of the ladder 3 in accordance with the planned dredging depth DT.

そして、この状態で掘削手段5及び吸引ポンプ7を動作させるとともに、旋回手段4により浚渫船本体2とともにラダー3を旋回させ、ポンプ浚渫工程を開始する。   In this state, the excavating means 5 and the suction pump 7 are operated, and the turning means 4 turns the ladder 3 together with the dredger main body 2 to start the pump dredging process.

このポンプ浚渫工程は、図7に示すように、ラダー3の旋回(スイング)に伴い掘削手段5によって円弧状に水底部Aが掘削され、掘削手段5によって掘削された土砂を周囲の海水とともに排砂管路6を通して吸引ポンプ7により吸い上げ、ポンプ圧送により土捨て場に直接移送する。   In the pump dredging process, as shown in FIG. 7, the bottom A is excavated in an arc shape by the excavating means 5 along with the turning of the ladder 3, and the earth and sand excavated by the excavating means 5 are discharged together with the surrounding seawater. It is sucked up by the suction pump 7 through the sand pipe 6 and directly transferred to the dumping site by pumping.

そして、ラダー3とともに掘削手段5を計画浚渫幅Wの端から端まで旋回させ、計画浚渫幅Wの端から端に亘って浚渫することにより、旋回方向に連続した浚渫溝40が形成される。   Then, the excavation means 5 is swung from end to end of the planned dredging width W together with the ladder 3 and dredded from end to end of the planned dredging width W, whereby the dredging groove 40 continuous in the turning direction is formed.

その際、一方のスパット8を基軸としたポンプ浚渫船1(浚渫船本体2)の旋回(スイング)動作に伴い、他方のスパット8の位置が当該一方のスパット8の位置より前方に移動するので、その位置で他方のスパット8を水底部Aに打ちこみ、一方のスパット8を引き上げること、即ち、両スパット8,8を打ち替えることにより、ポンプ浚渫船1が一定距離前進する。   At that time, the position of the other spat 8 moves forward from the position of the one spat 8 as the pump dredger 1 (the dredger body 2) pivots (swings) with the one spat 8 as a base. When the other spat 8 is driven into the water bottom A at the position and the one spat 8 is pulled up, that is, the both spats 8 and 8 are replaced, the pump dredger 1 moves forward by a certain distance.

しかる後、水底部Aに打ちこまれているスパット8をポンプ浚渫船1の旋回基軸とし、昇降手段9を動作させてラダー3を傾動させ、先端部を水底部Aに向けて水中に挿入し、ラダー3先端部の掘削手段5を水底部Aに降下させ、上記と同様にポンプ浚渫工程を行う。   After that, the spat 8 driven into the water bottom A is used as the pivot base of the pump dredger 1, the lifting means 9 is operated to tilt the ladder 3, and the tip is inserted into the water toward the water bottom A, The excavating means 5 at the tip of the ladder 3 is lowered to the water bottom A, and the pump dredging process is performed in the same manner as described above.

そして、ポンプ浚渫工程をポンプ浚渫船1の移動毎に繰り返すことにより、既に浚渫作業を終えた箇所の浚渫溝40の浚渫船移動方向手前側に新たな浚渫溝40が平行に形成されるとともに、互いにポンプ浚渫船1の移動方向で隣り合う浚渫溝40,40間に山形状の凸部43が形成され、図11に示すように、ポンプ浚渫船1の移動方向に凹凸が連なる不陸が生じる。   Then, by repeating the pump dredging process every time the pump dredger 1 is moved, new dredging grooves 40 are formed in parallel on the front side of the dredging groove 40 in the dredger movement direction at the place where dredging work has already been completed. A mountain-shaped convex portion 43 is formed between the adjacent trenches 40 and 40 in the moving direction of the dredger 1, and unevenness in the moving direction of the pump dredger 1 occurs as shown in FIG. 11.

尚、各ポンプ浚渫工程においては、計画浚渫深度DTに対するラダー3先端部の深度を、従来の浚渫作業における計画浚渫深度DTに対するラダー3先端部の深度に比べて浅い位置に設定したことによって、凸部43の頂部高さが設定された計画浚渫深度DTまで至らない場合がある。   In each pump dredging process, the depth of the tip of the ladder 3 with respect to the planned dredging depth DT is set to a shallow position compared to the depth of the tip of the ladder 3 with respect to the planned dredging depth DT in the conventional dredging operation. The top height of the portion 43 may not reach the planned dredging depth DT.

一方、各ポンプ浚渫工程の際には、均し具24a,24bを水底部Aでラダー3の旋回に連動してラダー3の旋回方向に移動させ、既にポンプ浚渫工程を終えた水底部Aを平坦に均す作業(均し工程)を同時に行う。   On the other hand, in each pump dredging process, the leveling tools 24a and 24b are moved in the swirling direction of the ladder 3 in conjunction with the swirling of the ladder 3 at the water bottom A, and the water bottom A having already finished the pump dredging process is moved. Perform the leveling process (leveling process) at the same time.

均し工程は、先ず、昇降手段9を動作させてラダー3を傾動させ、ラダー3先端部の掘削手段5を水底部Aに降下させる際、ラダー位置計測手段25によって計測されたラダー3の傾斜角及び潮位に基づいて、各調節用ウインチ28,28を動作させ、各均し具24a,24bを着底させる。   In the leveling step, first, the elevating means 9 is operated to tilt the ladder 3, and when the excavating means 5 at the tip of the ladder 3 is lowered to the bottom A, the inclination of the ladder 3 measured by the ladder position measuring means 25 is measured. Based on the angle and the tide level, the respective adjustment winches 28 and 28 are operated, and the leveling tools 24a and 24b are grounded.

その際、各均し具24a,24bは、ラダー3の両側でそれぞれ高さを違えさせ、具体的には、旋回方向前方(本実施例では、図4中右側)の均し具24aを計画浚渫深度DTに合わせ、旋回方向後方(本実施例では、図4中左側)の均し具24bを計画浚渫深度DTよりやや深い位置D1(以下、均し面位置という)に合わせる。   At that time, each of the leveling tools 24a and 24b has a different height on both sides of the ladder 3, and specifically, the leveling tool 24a ahead of the turning direction (right side in FIG. 4 in this embodiment) is planned. In accordance with the dredging depth DT, the leveling tool 24b at the rear in the turning direction (left side in FIG. 4 in this embodiment) is set to a position D1 slightly deeper than the planned dredging depth DT (hereinafter referred to as the leveling surface position).

そして、ラダー3先端部及び各均し具24a,24bをそれぞれ所定の深度DT,D1に着底させた後、旋回手段4により浚渫船本体2とともにラダー3の旋回を開始する。   Then, after the bottom of the ladder 3 and the leveling tools 24a and 24b are settled to the predetermined depths DT and D1, respectively, the turning of the ladder 3 together with the dredger main body 2 is started by the turning means 4.

ラダー位置計測手段25は、ラダー3の旋回中随時、傾斜計33によってラダー3の傾斜角を計測するとともに、潮位受信機34によって潮位データを受信し、ラダー3先端部の位置を検知するとともに、その計測データを制御装置22に出力する。   The ladder position measuring means 25 measures the inclination angle of the ladder 3 by the inclinometer 33 and receives the tide level data by the tide level receiver 34 and detects the position of the tip of the ladder 3 at any time during the turning of the ladder 3. The measurement data is output to the control device 22.

そして、制御装置22は、ラダー位置計測手段25の計測結果に基づき、調節用ウインチ28,28によって支持ワイヤ29を繰り出し・巻き取りすることによって、各均し具24a,24bの高さ及び傾斜角を調節する。   Then, the control device 22 feeds and winds up the support wire 29 by the adjustment winches 28 and 28 based on the measurement result of the ladder position measuring means 25, so that the height and inclination angle of each of the leveling tools 24a and 24b. Adjust.

よって、各均し具24a,24bは、旋回中常に設定された浚渫深度及び傾斜角に維持され、図4、図8に示すように、ラダー3の旋回に伴って、旋回方向前方の均し具24aの土砂押圧面(ウェブ31)で凸部上部43aの土砂を押しやり、押しやられた土砂が両側の浚渫溝40,40に移動し、旋回方向後方の均し具24bで残った部分43bの土砂を押しやりつつ、均し具24bの底面で平坦に整える。   Therefore, each leveling tool 24a, 24b is always maintained at the set depth and inclination angle during turning, and as shown in FIG. 4 and FIG. A portion 43b remaining on the leveling tool 24b at the rear in the swiveling direction, with the earth and sand pressing surface (web 31) of the tool 24a pushing the earth and sand of the convex upper portion 43a, the pushed earth and sand moving to the ridges 40 and 40 on both sides. While smoothing the earth and sand, the bottom surface of the leveling tool 24b is flattened.

このように、均し具24a,24bの高さをラダー3の両側において高さを違え、粗均しと仕上げ均しを二段階で行うことによって、効率良く高精度で均し面を計画浚渫深度DTよりやや深めに整えることができる。   In this way, the leveling surfaces 24a and 24b are different in height on both sides of the ladder 3, and the leveling and finishing leveling are performed in two stages, so that the leveling surface can be planned efficiently and accurately. It can be arranged slightly deeper than the depth DT.

そして、計画浚渫幅Wの端から端に亘ってラダー3を旋回させ、当該浚渫幅に亘ってラダー3先端部の掘削手段5によって掘削を行うとともに、ラダー3先端部より浚渫船移動方向手前側の既に浚渫工程を終えた部分を計画浚渫幅の端から端に亘って平坦に均す。   Then, the ladder 3 is swung from end to end of the planned dredging width W and excavated by the excavating means 5 at the leading end of the ladder 3 over the dredging width, and at the front side in the dredger moving direction from the leading end of the ladder 3 The portion that has already finished the dredging process is leveled flatly from end to end of the planned dredging width.

その際、ラダー3が計画浚渫幅Wの端部まで移動した際、支持部材26,26がラダー3側面より外向きに突出し、均し具24a,24bがラダー側面より距離を置いて支持されているので、図7に示すように、外側の均し具24a,24bがラダー3先端部(掘削手段5)よりも外側まで移動でき、計画浚渫幅Wよりも広い範囲W2を均すことができ、浚渫作業を行った部分を漏れなく均すことができる。   At that time, when the ladder 3 moves to the end of the planned width W, the support members 26 and 26 protrude outward from the side surface of the ladder 3, and the leveling tools 24a and 24b are supported at a distance from the ladder side surface. Therefore, as shown in FIG. 7, the outer leveling tools 24a and 24b can move to the outer side of the tip of the ladder 3 (excavation means 5), and the range W2 wider than the planned width W can be leveled. , The part that has been dredged can be leveled without omission.

次に、計画浚渫幅Wの端から端まで浚渫作業及び均し作業が完了した後、ラダー3を一旦上昇させた後、両スパット8,8の打ち替えを利用してポンプ浚渫船1を一定距離前進させ、上記の浚渫工程及び均し工程をポンプ浚渫船1の移動毎に繰り返す。   Next, after the dredging work and leveling work are completed from end to end of the planned dredging width W, the ladder 3 is once lifted, and then the pump dredger 1 is moved a certain distance by using the replacement of both spats 8 and 8. Advance and repeat the dredging process and the leveling process for each movement of the pump dredger 1.

尚、各均し具24a,24bの高さは、各均し工程の旋回方向に合わせて逆転させ、図4中に示す旋回方向と逆方向に旋回する際には、旋回方向前方の均し具24bの深度を計画浚渫深度DTに合わせ、旋回方向後方の均し具24aの深度を均し面深度D1に合わせて調整する。   In addition, the height of each leveling tool 24a, 24b is reversed according to the turning direction of each leveling process, and when turning in the direction opposite to the turning direction shown in FIG. The depth of the tool 24b is adjusted to the planned dredging depth DT, and the depth of the leveling tool 24a behind the turning direction is adjusted to the leveling surface depth D1.

このように構成された水底部の均し方法では、ポンプ浚渫工法において、浚渫作業と均し作業とを同時に行うことができ、均し作業を行うことで、従来に比べ余掘り量を大幅に低減することができる。   In the water bottom leveling method constructed in this way, in the pump dredging method, dredging work and leveling work can be performed at the same time. Can be reduced.

尚、上述の実施例では、ラダー位置計測手段25をラダー3に設置された傾斜計33と、陸上に設置された潮位計測局から潮位データを受信する潮位受信機34とをもって構成した例について説明したが、ラダー位置計測手段25の構成は上記実施例に限定されず、例えば、水深を計測する水深計と、ラダー3先端部の位置を計測するためのGPS等のGNSS機器との組み合わせをもって構成してもよい。   In the above-described embodiment, an example in which the ladder position measuring means 25 is configured with an inclinometer 33 installed on the ladder 3 and a tide level receiver 34 that receives tide level data from a tide level measurement station installed on land will be described. However, the configuration of the ladder position measuring means 25 is not limited to the above embodiment, and for example, it is configured with a combination of a depth meter for measuring the water depth and a GNSS device such as GPS for measuring the position of the tip of the ladder 3. May be.

また、上述の実施例では、均し具24a,24bが支持ワイヤ29を介して支持され、支持ワイヤ29の繰り出し量で均し具24a,24bの高さ及び傾斜角を調節するようにした例について説明したが、均し具24a,24bの支持手段及び調節手段の態様は、これに限定されず、支持部材26,26に支持させた伸縮可能なシリンダ等の伸縮部材に均し具24a,24bを連結し、伸縮部材の伸縮によって均し具24a,24bを高さ及び傾斜角を調節するようにしてもよい。   In the above-described embodiment, the leveling tools 24 a and 24 b are supported via the support wire 29, and the height and the inclination angle of the leveling tools 24 a and 24 b are adjusted by the feeding amount of the support wire 29. However, the mode of the support means and the adjustment means of the leveling tools 24a, 24b is not limited to this, and the leveling tools 24a, 24a, 24c can be applied to the stretchable members such as the extendable cylinders supported by the support members 26, 26. 24b may be connected, and the height and inclination angle of the leveling tools 24a and 24b may be adjusted by expansion and contraction of the elastic member.

更に、上述の実施例では、均し具をラダー3の両側に設けた例について説明したが、何れか一方のみに設けてもよい。   Furthermore, in the above-described embodiment, the example in which the leveling tool is provided on both sides of the ladder 3 has been described. However, the leveling tool may be provided on only one of them.

1 ポンプ浚渫船
2 浚渫船本体
3 ラダー
4 旋回手段
5 掘削手段
6 排砂管路
7 吸引ポンプ
8 スパット
9 フレーム
10 ラダー操作用ワイヤ
20 水底均し装置
21 制御室
22 制御装置
23 支持体
24a,24b 均し具
25 ラダー位置計測手段
26 支持部材
27 滑車
28 調節用ウインチ
29 支持ワイヤ
30 フランジ
31 ウェブ
32 連結具
33 傾斜計
34 潮位受信機
DESCRIPTION OF SYMBOLS 1 Pump dredger 2 Dredger main body 3 Ladder 4 Turning means 5 Excavation means 6 Sand discharge pipe 7 Suction pump 8 Spat 9 Frame 10 Ladder operation wire 20 Water bottom leveling device 21 Control chamber 22 Control device 23 Supports 24a, 24b Leveling Tool 25 Ladder position measuring means 26 Support member 27 Pulley 28 Adjusting winch 29 Support wire 30 Flange 31 Web 32 Connector 33 Inclinometer 34 Tide level receiver

Claims (6)

浚渫船本体から先端側を水底部に向けて水中に挿入されるラダーと、該ラダーを旋回させる旋回手段と、該ラダー先端部に配置された掘削手段と、前記ラダー先端部に吸引口を開口させた排砂管路と、該排砂管路に接続された吸引ポンプとを備えたポンプ浚渫船にあって、掘削された水底部を均す為のポンプ浚渫船用水底均し装置において、
前記ラダーの側部に支持体を介して支持された均し具を備え、該均し具の土砂押圧面が前記ラダーの旋回方向に向けられていることを特徴とするポンプ浚渫船用水底均し装置。
A ladder inserted into the water with the tip side facing the bottom of the water from the dredger body, a turning means for turning the ladder, an excavation means disposed at the tip of the ladder, and a suction port opened at the tip of the ladder In a pump dredger equipped with a sand discharge pipe and a suction pump connected to the sand discharge pipe, a water leveling device for a pump dredger for leveling an excavated water bottom,
A water leveling unit for pump dredgers comprising a leveling tool supported on a side portion of the ladder via a support, and a soil pressing surface of the leveling tool is directed in a turning direction of the ladder. apparatus.
前記ラダーの先端位置を検知するラダー位置計測手段と、前記ラダー位置計測手段の検知結果に基づき、水底面に対する前記均し具の高さ及び傾斜角を調整する調節手段とを備えている請求項1に記載のポンプ浚渫船用水底均し装置。 A ladder position measuring means for detecting a tip position of the ladder, and an adjusting means for adjusting a height and an inclination angle of the leveling tool with respect to a water bottom based on a detection result of the ladder position measuring means. The water bottom leveling device for pump dredger according to 1. 前記支持体は、前記ラダーの側面より外向きに張り出した形状に形成され、前記均し具が前記ラダー側面より距離を置いて支持されている請求項1又は2に記載のポンプ浚渫船用水底均し装置。   The bottom of the pump dredger according to claim 1 or 2, wherein the support is formed in a shape projecting outward from a side surface of the ladder, and the leveling tool is supported at a distance from the side surface of the ladder. Equipment. 浚渫船本体から水底部に向けて水中に挿入したラダーを旋回させつつ、ラダー先端部に配置された掘削手段で水底部を掘削し、その掘削した土砂を周囲の海水とともに排砂管路を通して除去するポンプ浚渫工程を前記浚渫船本体の移動毎に繰り返すに際し、
前記ラダーの側部に支持体を介して土砂押圧面を旋回方向に向けた均し具を取り付け、該均し具を水底部で前記ラダーの旋回に連動してラダー旋回方向に移動させ、既に前記ポンプ浚渫工程を終えた水底部を平坦に均す均し工程を前記ポンプ浚渫工程と同時に行うことを特徴とする水底均し方法。
While turning the rudder inserted into the water from the dredger body toward the bottom of the water, the bottom of the water is excavated by the excavating means arranged at the tip of the rudder, and the excavated earth and sand are removed through the sand discharge pipe along with the surrounding sea water. When repeating the dredging process every time the dredger body moves,
A leveling tool with the earth and sand pressing surface facing the turning direction is attached to the side of the ladder via a support, and the leveling tool is moved in the ladder turning direction in conjunction with the turning of the ladder at the bottom of the water. A water bottom leveling method characterized by performing a leveling step of flattening a water bottom after finishing the pump dredging step simultaneously with the pump dredging step.
一対の前記均し具を前記ラダーの両側にそれぞれ高さを違えて支持させた請求項4に記載の水底均し方法。   The water bottom leveling method according to claim 4, wherein the pair of leveling tools are supported on both sides of the ladder with different heights. 前記均し具を前記ラダーの側面より距離を置いて支持させ、前記掘削手段による掘削幅の外側まで水底部を均す請求項4又は5に記載の水底均し方法。   6. The water bottom leveling method according to claim 4, wherein the leveling tool is supported at a distance from a side surface of the ladder, and the water bottom is leveled to the outside of the excavation width by the excavation means.
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