JPH08232293A - High-concentration dredging device - Google Patents
High-concentration dredging deviceInfo
- Publication number
- JPH08232293A JPH08232293A JP3740895A JP3740895A JPH08232293A JP H08232293 A JPH08232293 A JP H08232293A JP 3740895 A JP3740895 A JP 3740895A JP 3740895 A JP3740895 A JP 3740895A JP H08232293 A JPH08232293 A JP H08232293A
- Authority
- JP
- Japan
- Prior art keywords
- mud
- conveyor
- bottom guide
- guide surface
- dredging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、水底に堆積した泥土を
高濃度で連続して浚渫する高濃度浚渫装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-concentration dredging device for continuously dredging mud deposited on the bottom of water at a high concentration.
【０００２】[0002]
【従来の技術】汚泥浚渫においては、浚渫時にできるだ
け水の混入の防止すると共に、堆積状態のまま浚渫する
ことが望ましく、このため種々の浚渫装置がその目的に
合わせて用いられている。例えばポンプを用いる吸引方
式では、堆積した泥土をそのまま、あるいは攪拌して吸
引するため、泥土は泥水の流れに沿って吸引口に流れ込
み、土質によっては泥土中に所謂みず道ができ易く、こ
のみず道ができると、周囲の水を吸引してしまうため高
含泥での浚渫が困難となる。また、グラブバケットを用
いるグラブ方式では、グラブバケットにより堆積した泥
土を浚渫するものであるが、30〜40センチ程度の薄層の
浚渫を行う場合、グラブバケットの形状により、余分な
水の取り込みが大となり、薄層での高濃度浚渫が困難で
あると共に、水底で浚渫を行ったグラブバケットの泥土
をその都度浚渫船上にあけるため、浚渫作業が断続的な
ものになるという問題があった。2. Description of the Related Art In sludge dredging, it is desirable to prevent water from being mixed in as much as possible during dredging and to dredge in a piled state. Therefore, various dredging devices are used according to the purpose. For example, in the suction method using a pump, the accumulated mud is sucked as it is or with stirring, so the mud flows into the suction port along the flow of the mud, and depending on the soil quality, a so-called water passage can easily form in the mud. If a path is created, it will suck in the surrounding water, making it difficult to dredge with high mud content. In addition, the grab method using a grab bucket dredges the mud accumulated by the grab bucket.However, when performing a dredging of a thin layer of about 30 to 40 cm, the shape of the grab bucket prevents excess water from being taken up. There is a problem that it becomes difficult to perform high-concentration dredging in a thin layer, and the mud in the grab bucket dredged at the bottom of the water is opened on the dredging vessel each time, so that the dredging work becomes intermittent.
【０００３】これらの問題を解消し、高濃度浚渫を可能
にするため、例えば特公平６−８９５５７号公報では、
回転胴部と、この回転胴部の外周から半径方向外方に突
出可能な複数のスライド掘削刃とを有する回転掘削機部
と、上記スライド掘削刃を駆動する機構と、上記回転胴
部の外周に所望の間隙を介して対向配置した板状底面切
削刃を有する固定切削機部と、上記スライド掘削刃と底
面切削刃とにより地盤から切り取られた泥土を揚泥する
機構とより成り、上記スライド掘削刃はその側方に突出
する軸とこの軸によって支承されたガイドローラとを有
し、上記スライド切削刃を駆動する機構は上記ガイドロ
ーラに対接され、上記回転胴部が回転したとき上記スラ
イド掘削刃を次第に上記回転胴部内に向かって押し込む
ための掘削刃押し込みガイドを有する浚渫装置が提案さ
れ、この浚渫装置では、スライド切削刃の駆動により余
分な水の侵入を抑え、非攪乱状態で泥土を浚渫するもの
である。また、特公平５−６１４１３号公報には、カッ
タホイール上に、底部に投入口を有する複数のバケット
を設け、カッタホイールの内側にはバケットで掘削した
水底の泥土を投入するように上部に開口部を備えた貯泥
タンクを取付け、該貯泥タンク内に攪乱翼を設けて、カ
ッタホイールの上方部分を気密フードで覆い、該気密フ
ード内に加圧空気を連続的に供給する供給口を臨ませる
と共に、貯泥タンク内の泥土をパイプラインを介して処
理場に圧送するポンプを設けた高濃度浚渫装置が提案さ
れ、この高濃度浚渫装置では、気密フードにより水中で
気中雰囲気を作り、バケットで浚渫した泥土が気中雰囲
気に入って水切りされ、これにより含泥率の高い泥土を
浚渫するようにしている。In order to solve these problems and enable high-concentration dredging, for example, in Japanese Patent Publication No. 6-895557,
A rotary excavator unit having a rotary body and a plurality of slide excavating blades that can project radially outward from the outer periphery of the rotary body, a mechanism for driving the slide excavating blade, and an outer periphery of the rotary body. A fixed cutting machine section having plate-shaped bottom surface cutting blades opposed to each other through a desired gap, a mechanism for lifting mud cut from the ground by the slide excavating blade and the bottom surface cutting blade, and the slide The excavating blade has a shaft protruding laterally and a guide roller supported by this shaft, and a mechanism for driving the slide cutting blade is brought into contact with the guide roller, and when the rotating body rotates, A dredging device has been proposed that has a drilling blade pushing-in guide for gradually pushing the slide drilling blade toward the inside of the rotary body.In this dredging device, excessive water intrusion is suppressed by driving the slide cutting blade. Is for dredging mud in a non-disrupting conditions. Further, in Japanese Patent Publication No. 5-61413, a plurality of buckets having a charging port at the bottom are provided on a cutter wheel, and an opening is provided on the inside of the cutter wheel so that mud excavated by the bucket is charged into the upper part. A mud storage tank equipped with a section is attached, a disturbance vane is provided in the mud storage tank, the upper part of the cutter wheel is covered with an airtight hood, and a supply port for continuously supplying pressurized air to the airtight hood is provided. A high-concentration dredging device is proposed, which is equipped with a pump that presses the mud in the mud storage tank to the treatment site through a pipeline, and this high-concentration dredging device creates an air atmosphere in water with an airtight hood. The mud dredged in the bucket enters the air atmosphere and is drained, so that the mud with a high mud content is dredged.
【０００４】[0004]
【発明が解決しようとする課題】高濃度で汚泥浚渫を行
うために開発された、上記いずれの装置も、余分な水の
取り込みを極力防ぐ構造を有しており、適正土厚で浚渫
を行う場合、高濃度での浚渫が可能である。All of the above-mentioned devices developed for high-concentration sludge dredging have a structure that prevents the intake of excess water as much as possible, and perform dredging with an appropriate soil thickness. In case of high concentration, dredging is possible.
【０００５】しかしながら、いずれの装置に関しても浚
渫土厚が浚渫装置の適正土厚から外れた薄層で浚渫を行
う場合や、浚渫層厚が厚く２層や３層に別けて浚渫を行
う場合、適正土厚から外れた部分については、余分な水
を取込むこととなる。例えば、適正土厚の２分の１程度
の厚さの泥土層の掘削を行う場合、泥土とほぼ同量の水
を取り込むこととなり、高濃度での浚渫は困難となる。However, in any of the devices, when the dredging soil thickness is different from the appropriate soil thickness of the dredging device, the dredging is performed in a thin layer, or when the dredging layer is thick and divided into two or three layers, the dredging is performed. Excess water will be taken in from the part where the soil thickness is not appropriate. For example, when excavating a mud layer having a thickness of about ½ of the appropriate soil thickness, almost the same amount of water as the mud is taken in, which makes dredging at high concentration difficult.
【０００６】そのため、浚渫泥厚に合った掘削刃が必要
となるが、同一区域内で浚渫泥泥厚が変化する場合、対
応が困難になると予想される。Therefore, an excavating blade suitable for the dredging mud thickness is required, but it is expected that it will be difficult to cope with it if the dredging mud thickness changes within the same area.
【０００７】そこで本発明は、構造簡易にして連続した
高濃度浚渫が可能で、泥土の土質及び泥土層の厚さに合
わせて可変的に浚渫を行うことができる高濃度浚渫装置
を提供することを目的とする。Therefore, the present invention provides a high-concentration dredging device having a simple structure and capable of continuous high-concentration dredging, and capable of variably performing dredging according to the soil quality and the thickness of the mud layer. With the goal.
【０００８】[0008]
【課題を解決するための手段】請求項１の発明は、下部
に掘削用開口部を有する気密フード内に斜設したコンベ
ヤと、このコンベヤの無端状帯体に設けられ外周に突出
した複数の掘削刃と、前記コンベヤの無端状帯体を回転
駆動する回転駆動手段と、前記気密フード内に設けられ
前記無端状帯体の外周に間隔をおいてほぼ平行に設けた
底部案内面と、この底部案内面の上部に前記気密フード
内に連通して設けられ前記掘削刃により前記底部案内部
上に掻き上げた泥土を投入する投入口を有する貯泥タン
クと、前記気密フードに接続された空気供給口と、前記
貯泥タンク内の泥土をパイプラインを介して処理場に圧
送する圧送手段とを備えることを特徴とする高濃度浚渫
装置である。According to a first aspect of the present invention, there is provided a conveyor which is obliquely installed in an airtight hood having an opening for excavation at a lower portion thereof, and a plurality of conveyors which are provided on an endless belt of the conveyor and project outward. An excavating blade, a rotary drive means for rotationally driving the endless belt of the conveyor, a bottom guide surface provided in the airtight hood and provided substantially parallel to the outer periphery of the endless belt at intervals. A mud storage tank that is provided in communication with the inside of the airtight hood at the upper part of the bottom guide surface and has a charging port for charging the mud scraped up on the bottom guide part by the drilling blade, and air connected to the airtight hood. A high-concentration dredging device comprising: a supply port; and a pressure-feeding unit that pressure-feeds the mud in the mud storage tank to a treatment site via a pipeline.
【０００９】請求項２の発明は、前記コンベヤと前記底
部案内面とを一体的に傾動する角度調整機構を設けたこ
とを特徴とする請求項１記載の高濃度浚渫装置である。A second aspect of the present invention is the high-concentration dredging apparatus according to the first aspect, wherein an angle adjusting mechanism for integrally tilting the conveyor and the bottom guide surface is provided.
【００１０】[0010]
【作用】請求項１の構成では、無端状帯体の回転駆動に
より、掘削刃が泥土を気密フード内の底部案内面に連続
的に掻き上げ、該気密フードの気中雰囲気内にて水切り
された状態で貯泥タンク内に投入され、この含水率の低
い泥土がパイプラインを介して処理場に送られる。そし
て底部案内面に沿って掘削刃が泥土を押し上げて運搬す
るため、該掘削刃に平板状のものを用いることができ、
掘削刃に泥土が付着しにくくなると共に、水を掻き揚げ
にくくなる。また、掘削用開口部から底部案内面に掻き
揚げた泥土を、該案内面上部の貯泥タンクに投入するた
め、揚泥距離が比較的短くなる。According to the first aspect of the present invention, the endless belt is rotationally driven so that the excavating blade continuously scrapes up the mud onto the bottom guide surface in the airtight hood and drains it in the air atmosphere of the airtight hood. The mud with low water content is sent to the treatment plant through the pipeline. And since the excavating blade pushes up and conveys the mud along the bottom guide surface, it is possible to use a flat plate-shaped excavating blade,
Muddy soil is less likely to adhere to the drilling blade, and it is more difficult to scoop up water. Further, since the mud scraped up from the excavation opening to the bottom guide surface is put into the mud storage tank above the guide surface, the lifted mud distance becomes relatively short.
【００１１】請求項２の構成では、コンベヤと底部案内
面の角度を小から大に調整することにより、薄層泥土か
ら厚層泥土まで異なる厚さの層の浚渫を行うことができ
る。また、粘性の大きな泥土を浚渫する場合は、前記角
度を小さくすると、掘削刃が垂直に近くなり、該掘削刃
に泥土が付着しにくくなる。According to the second aspect of the present invention, by adjusting the angle between the conveyor and the bottom guide surface from small to large, it is possible to dredge layers having different thicknesses from thin mud to thick mud. Further, in the case of dredging mud having a high viscosity, if the angle is made smaller, the excavating blade becomes closer to vertical, and the mud is less likely to adhere to the excavating blade.
【００１２】[0012]
【実施例】以下、本発明の実施例を添付図面を参照して
説明する。図１ないし図４は本発明の第１実施例を示
し、同図において、浚渫装置本体Ｓは、前側を高く後側
を低くして斜設したコンベヤ１を備え、このコンベヤ１
は、左右平行に配置したコンベヤ側枠部２，２の中央を
幅方向のコンベヤ中央枠部３により連結した平面略Ｈ型
の機枠４を形成し、それらコンベヤ側枠部２，２の前側
及び後側に軸受５を介して駆動軸６と従動軸７とを回動
可能に設け、これら駆動軸６及び従動軸７の左，右，中
央にそれぞれスプロケット８，８，８をそれぞれ固着
し、前後で対応するスプロケット８，８に無端状帯体た
るチェーン９を掛装し、これら左，右，中央のチェーン
９，９，９に複数の掘削刃10を等間隔で設けると共に、
該掘削刃10をコンベヤ１の外周側に突出して設け、これ
ら掘削刃10は板状をなすと共に、前記左右のコンベヤ側
枠部２，２の間隔にほぼ対応した左右幅寸法を有し、該
掘削刃10はチェーン９の長さ方向に直交して保持され、
また、前後に隣合う前記掘削刃10，10の内端10Ａ，10Ａ
間は開口している。そして前記チェーン９は底面側に後
下部から前上部に向かって斜設された運搬路９Ａを少な
くとも有している。さらに前記コンベヤ１は、下部に掘
削用開口部11を有する気密フード12により覆われ、この
気密フード12は、左，右側板部13，13と、これら側板1
3，13を連結する胴部14とを気密に組み立てると共に、
前記左，右側板13，13を前記左，右のコンベヤ側枠部
２，２に一体的に設けている。また、前記胴部14は、上
面部15と前側の半円状湾曲部16と底部案内部17とを有
し、この略平板状をなす底部案内部17の前後縁は下向き
に折り曲げられており、前記底部案内部17の内面である
底部案内面17Ａが前記チェーン９の外周に間隔をおいて
平行に設けられてる。また、前記底部案内面17Ａの上部
には泥土Ｄを投入する投入口18が前記気密フード12内に
連設して設けられ、この投入口18の下部に貯泥タンク19
が設けられ、この貯泥タンク19は前記気密フード12と一
体かつ内部を気密に設けられている。前記貯泥タンク19
には圧送手段たるサンドポンプ20を設け、このサンドポ
ンプ20の回転駆動軸20Ａの先端に攪乱翼21を設け、該サ
ンドポンプ20により吸引した泥土Ｄをパイプラインであ
る排泥管22を介して処理場に圧送するようになってい
る。前記気密フード12の上部には該気密フード12内に空
気を圧送する空気供給口23が設けられ、この空気供給口
23にパイプ24を接続し、このパイプ24が水面上の浚渫船
（図示せず）に設けられた空気圧縮機等の空気供給手段
（図示せず）に接続されている。Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a first embodiment of the present invention, in which a dredging device main body S is provided with a conveyor 1 obliquely installed with its front side being high and its rear side being low.
Forms a plane substantially H-shaped machine frame 4 in which the centers of the conveyor side frame parts 2 and 2 arranged in parallel to each other are connected by a widthwise conveyor center frame part 3, and the front side of these conveyor side frame parts 2 and 2 is formed. Further, a drive shaft 6 and a driven shaft 7 are rotatably provided on the rear side through a bearing 5, and sprockets 8, 8 and 8 are fixed to the left, right and center of the drive shaft 6 and the driven shaft 7, respectively. , The front and rear corresponding sprockets 8 and 8 are hooked with a chain 9 which is an endless belt, and a plurality of excavating blades 10 are provided at equal intervals on these left, right and center chains 9, 9 and 9.
The digging blades 10 are provided so as to project to the outer peripheral side of the conveyor 1, and these digging blades 10 are plate-shaped and have a lateral width dimension substantially corresponding to the interval between the left and right conveyor side frame portions 2 and 2. The drilling blade 10 is held orthogonally to the length direction of the chain 9,
In addition, the inner ends 10A, 10A of the excavating blades 10, 10 adjacent to each other in the front and rear
The spaces are open. The chain 9 has at least a transport path 9A on the bottom surface that is obliquely provided from the lower rear portion to the upper front portion. Further, the conveyor 1 is covered with an airtight hood 12 having an opening 11 for excavation at the bottom, and the airtight hood 12 includes left and right side plate portions 13 and 13, and these side plates 1.
Assemble the body 14 that connects 3 and 13 airtightly,
The left and right side plates 13, 13 are integrally provided on the left and right conveyor side frame portions 2, 2. Further, the body portion 14 has an upper surface portion 15, a front semicircular curved portion 16 and a bottom guide portion 17, and the front and rear edges of the substantially flat plate-shaped bottom guide portion 17 are bent downward. A bottom guide surface 17A, which is an inner surface of the bottom guide portion 17, is provided on the outer periphery of the chain 9 in parallel at a distance. A charging port 18 for charging mud D is continuously provided in the airtight hood 12 above the bottom guide surface 17A, and a mud storage tank 19 is provided below the charging port 18.
This mud storage tank 19 is provided integrally with the airtight hood 12 and is airtightly provided inside. The mud storage tank 19
A sand pump 20, which is a pressure feeding means, is provided at the tip of the rotary drive shaft 20A of the sand pump 20, and a disturbing blade 21 is provided at the tip of the sand pump 20 to pass the mud D sucked by the sand pump 20 through a drain mud pipe 22 that is a pipeline. It is designed to be pumped to the treatment plant. An air supply port 23 for sending air into the airtight hood 12 is provided on the upper part of the airtight hood 12.
A pipe 24 is connected to 23, and the pipe 24 is connected to an air supply means (not shown) such as an air compressor provided in a dredger (not shown) on the water surface.
【００１３】前記コンベヤ１、気密フード12及び貯泥タ
ンク19を備えた前記浚渫装置本体Ｓは、角度調整機構25
によりその傾斜角度θを調整可能に設けられており、こ
の角度調整機構25は前記気密フード12の上面部15のほぼ
中央に左右方向の連結軸26を介して吊下部材27を回動可
能に連結し、この吊下部材27と前記上面部15後側とを油
圧シリンダーなどの伸縮アーム28により連結し、この伸
縮アーム28の両端はそれぞれ枢着されており、前記伸縮
アーム28の伸縮により前記浚渫装置本体Ｓの傾きが調整
されるようになっている。また、図２に示すように前記
駆動軸６を回転駆動するモータなどの回転駆動手段29が
前記気密フード12の前左側に設けられ、その駆動手段29
も気密ケース30に収納されている。The dredging device main body S provided with the conveyor 1, the airtight hood 12 and the mud storage tank 19 has an angle adjusting mechanism 25.
The tilt angle θ can be adjusted by means of the angle adjusting mechanism 25 so that the hanging member 27 can be rotated substantially at the center of the upper surface portion 15 of the airtight hood 12 via a connecting shaft 26 in the left-right direction. The suspension member 27 and the rear side of the upper surface portion 15 are connected to each other by a telescopic arm 28 such as a hydraulic cylinder, and both ends of the telescopic arm 28 are pivotally connected to each other. The inclination of the dredging device body S is adjusted. Further, as shown in FIG. 2, a rotation driving means 29 such as a motor for driving the driving shaft 6 to rotate is provided on the front left side of the airtight hood 12, and the driving means 29 is provided.
Is also stored in an airtight case 30.
【００１４】31は前記コンベヤの後部に設けられた水平
保持体であり、斜設した前記浚渫装置本体Ｓを水平移動
するように保持するものであって、この水平保持体31
は、掘削後の水底の掘削面32に平行に配置される水平板
33と、この水平板33の後部に立設した左右のブラケット
34，34と、前記掘削用開口部11を左右から挟む左右側板
35，35とを一体に有し、前記水平板33は前記掘削用開口
部11より左右方向が僅かに幅広に形成され、前記ブラケ
ット34の上部に伸縮アーム36の下端を連結軸36Ｄを介し
て連結するとともに、該伸縮アーム36の上端を前記吊下
部材27に連結軸36Ｕを介して連結し、これら連結軸36
Ｕ，36Ｄを中心に前記伸縮アーム36，前記ブラケット34
が回動可能でかつ相互の角度を固定できるようになって
おり、前記伸縮アーム36には、油圧シリンダなどが用い
られる。前記吊下部材27は前記浚渫船に連結したラダー
37に水平回動機構38を介して連結されている。また、前
記気密フード12の底部案内部17の下部には、複数の障害
物防御爪39が左右方向に並んで設けられ、その防御爪39
の上端39Ｕが前記底部案内部17側に角度調節かつ固定可
能に連結され、前記防御爪39の角度を調整して該防御爪
39の下端39Ｄの高さを前記水平板33に合わせている。
尚、図中41は深度計測手段たる深度計測管であって、深
度を計測する検知部41Ａを下端に有している。また、図
中42は泥位センサであって、前記貯泥タンク19内の泥土
Ｄの高さを検知する検知部42Ａを下端に有している。Reference numeral 31 is a horizontal holding body provided at the rear portion of the conveyor, which holds the obliquely installed main body S of the dredging device so as to move horizontally.
Is a horizontal plate placed parallel to the excavation surface 32 on the bottom of the water after excavation.
33 and the left and right brackets standing on the rear of this horizontal plate 33
34, 34 and left and right side plates that sandwich the excavation opening 11 from the left and right
35 and 35 are integrally formed, the horizontal plate 33 is formed to be slightly wider in the left-right direction than the excavation opening 11, and the lower end of the telescopic arm 36 is provided above the bracket 34 via a connecting shaft 36D. In addition to connecting, the upper end of the telescopic arm 36 is connected to the suspension member 27 via a connecting shaft 36U.
The expandable arm 36 and the bracket 34 centering around U and 36D
Are rotatable and can fix their mutual angles, and a hydraulic cylinder or the like is used for the telescopic arm 36. The suspension member 27 is a ladder connected to the dredger.
It is connected to 37 via a horizontal rotation mechanism 38. In addition, a plurality of obstacle protection claws 39 are provided in the lower part of the bottom guide portion 17 of the airtight hood 12 side by side in the left-right direction.
An upper end 39U of the protection claw 39 is connected to the side of the bottom guide portion 17 so that the angle can be adjusted and fixed, and the angle of the protection claw 39 can be adjusted.
The height of the lower end 39D of 39 is adjusted to the horizontal plate 33.
Incidentally, reference numeral 41 in the drawing denotes a depth measuring tube which is a depth measuring means, and has a detection unit 41A for measuring the depth at the lower end. Reference numeral 42 in the drawing denotes a mud level sensor, which has a detection portion 42A at the lower end for detecting the height of the mud D in the mud storage tank 19.
【００１５】次に前記構成につきその作用を説明する
と、浚渫船のラダー37を水平方向にスイングして該ラダ
ー37の先端に取付けた浚渫装置本体Ｓを図１中左側の前
方に向かって水平移動させる。同時に回転駆動手段に29
より、前記コンベヤ１のチェーン９を時計回り方向に回
転駆動し、また、空気供給口23から圧縮空気を供給す
る。そしてチェーン９に設けた掘削刃10により底部案内
面17Ａ上に送り込まれた泥土Ｄは、該底部案内面17Ａ上
部の投入口18から貯泥タンク19内に連続的に集められ
る。この際、前記空気供給口23から圧縮空気を気密フー
ド12内に連続的に供給して、図２の二点鎖線に示すフー
ド内水位Ｗより上部を気中雰囲気に保っているため、掘
削刃10により前記底部案内面17Ａを斜め上方に運ばれる
泥土Ｄの水切りが良好に行われ、含水率の低い高濃度の
泥土Ｄが貯泥タンク19内に集められ、この泥土Ｄは含水
率が低いため、これを吸引するサンドポンプ20の動作と
同時に攪乱翼21が泥土Ｄを攪乱し、圧送に適した状態で
排泥管22を通って処理場である浚渫船あるいは処理場で
ある埋立て地へと送られる。また、掘削用開口部11の前
側に設けた複数の障害物防御爪39が、掘削用開口部11前
側の泥土Ｄの夾雑物を除去し、コンベヤ１及びサンドポ
ンプ20の障害になる大型ごみなどが混入することを防止
する。さらに、後方下部に設けた水平保持体31により、
傾斜した浚渫装置本体Ｓが安定して水平移動しながら浚
渫を行うことができ、水平保持体31の水平板33により浚
渫後の掘削面32がほぼ水平に均される。そして前記ラダ
ー37を一側方向にスイングして所定範囲の浚渫を行った
後、水平回動機構38により浚渫装置本体Ｓを１８０°水
平回動して他側方向にラダー37をスイングして浚渫を行
う。また、前記深度計測管41により、浚渫装置本体Ｓの
作業位置の水圧に応じて圧縮空気を気密フード12内に圧
送し、また、コンベヤ１の掘削刃10により泥土Ｄが連続
的に貯泥タンク19内に投入して連続浚渫がなされる。さ
らに、サンドポンプ20は空転を防止するために、泥位セ
ンサ42により貯泥タンク19内が所定以上の泥土Ｄを貯泥
した状態で、該サンドポンプ20を駆動するようになって
いる。そしてこの浚渫装置本体Ｓにおいては、底部案内
面17Ａに沿って掘削刃10が泥土Ｄを押し上げるようにし
て該泥土Ｄを貯泥タンク19へと運搬するため、掘削刃10
に平板状のものを用いることができ、しかも運搬路９Ａ
においては切削刃10が案内面17Ａに垂直で一定の傾きで
水平移動するため、粘性の高い泥土Ｄの浚渫に用いて
も、該掘削刃10に泥土Ｄが付着しにくくなる。また、従
来のバケット式のものでは、該バケットは泥と共に水も
掬い上げることとなるが、平板状の掘削刃10により水抜
けが良好であるとともに、掻き揚げる水の量も少なくな
る。The operation of the above construction will be described. The rudder 37 of the dredging ship is horizontally swung to horizontally move the dredging device main body S attached to the tip of the rudder 37 toward the left front side in FIG. . At the same time, 29
As a result, the chain 9 of the conveyor 1 is driven to rotate clockwise, and compressed air is supplied from the air supply port 23. Then, the mud D fed onto the bottom guide surface 17A by the excavating blade 10 provided on the chain 9 is continuously collected in the mud storage tank 19 from the inlet 18 at the upper part of the bottom guide surface 17A. At this time, the compressed air is continuously supplied from the air supply port 23 into the airtight hood 12 to keep the air above the water level W in the hood shown by the two-dot chain line in FIG. Due to 10, the mud D carried obliquely upward on the bottom guide surface 17A is drained well, and the high-concentration mud D having a low water content is collected in the mud storage tank 19, and the mud D has a low water content. Therefore, at the same time as the operation of the sand pump 20 for sucking this, the disturbing blades 21 disturb the mud D and pass through the mud pipe 22 in a state suitable for pumping to the dredger as the treatment site or the landfill as the treatment site. Is sent. In addition, a plurality of obstacle protection claws 39 provided on the front side of the excavation opening 11 remove foreign matters of the mud D on the front side of the excavation opening 11 to obstruct the conveyor 1 and the sand pump 20. Are prevented from mixing in. Further, by the horizontal holding body 31 provided at the lower rear,
The inclined dredging device main body S can perform the dredging while stably moving horizontally, and the horizontal plate 33 of the horizontal holder 31 flattens the excavated surface 32 after the dredging substantially horizontally. Then, after the ladder 37 is swung in one direction to perform dredging within a predetermined range, the horizontal turning mechanism 38 horizontally turns the dredging device body S by 180 ° to swing the rudder 37 in the other direction and dredge. I do. Further, the depth measuring pipe 41 pumps compressed air into the airtight hood 12 according to the water pressure at the working position of the dredging device main body S, and the excavating blade 10 of the conveyor 1 continuously stores the mud D in the mud storage tank. It is thrown into 19 and continuous dredging is done. Further, in order to prevent the sand pump 20 from idling, the sand pump 20 is driven by the mud level sensor 42 while the mud storage tank 19 stores a predetermined amount or more of mud D. In the dredging device body S, the excavating blade 10 pushes up the mud D along the bottom guide surface 17A so as to convey the mud D to the mud storage tank 19.
A flat plate can be used for the transport path 9A
In the above, since the cutting blade 10 moves vertically to the guide surface 17A with a certain inclination, the mud D is less likely to adhere to the excavating blade 10 even when used for dredging the mud D having high viscosity. Further, in the conventional bucket type, the bucket scoops water together with mud, but the flat plate-shaped excavating blade 10 allows good drainage and reduces the amount of water to be scooped up.
【００１６】さらに前記角度調整機構25により、浚渫装
置本体Ｓの傾斜角度θを調整して大きくすることによ
り、掘削用開口部11の有効高さ寸法Ｈ、すなわち後側案
内縁18の下端と水平板33との高さ間隔が大きくなり、深
層泥土Ｄの浚渫を行うことができる。尚、水平板33の高
さ位置は、回転駆動する掘削刃10先端の最低位置にほぼ
等しくしている。この場合、図４に示すように、浚渫装
置本体Ｓを傾斜角度θを４５度にして傾け、障害物防御
爪39を回動して掘削用開口部11の前方を塞ぐようにし、
また、前記水平保持体31は、伸縮アーム36を伸縮すると
ともに、両端の連結軸36Ｕ，36Ｄを回動して該水平保持
体31を平行位置に固定する。ちなみに斜角度θが３０度
では前記有効高さ寸法Ｈが２００ミリであれば、４５度
では４５０ミリ程度で２倍以上となる。そして掘削刃10
はチェーン９の長さ方向に直交して保持されているた
め、傾斜角度θを４５度にすると、図４に示すように掘
削刃10も４５度の傾斜になるため、掻揚げ力が増し、深
層泥土Ｄの浚渫を良好に行うことができる。Further, the angle adjusting mechanism 25 adjusts and increases the inclination angle θ of the dredging device main body S, so that the effective height dimension H of the excavation opening 11, that is, the lower end of the rear guide edge 18 is horizontal. Since the height interval with the plate 33 is increased, the deep mud D can be dredged. The height position of the horizontal plate 33 is substantially equal to the lowest position of the tip of the excavating blade 10 that is rotationally driven. In this case, as shown in FIG. 4, the dredging device body S is tilted at an inclination angle θ of 45 degrees, and the obstacle protection claw 39 is rotated to close the front of the excavation opening 11.
Further, the horizontal holding body 31 expands and contracts the telescopic arm 36 and rotates the connecting shafts 36U and 36D at both ends to fix the horizontal holding body 31 in the parallel position. By the way, when the inclination angle θ is 30 degrees, the effective height dimension H is 200 mm, and when it is 45 degrees, the effective height dimension H is about 450 mm, which is more than double. And drilling blade 10
Is held orthogonally to the length direction of the chain 9, therefore, when the inclination angle θ is 45 degrees, the excavating blade 10 also has an inclination of 45 degrees as shown in FIG. The deep mud D can be dredged well.
【００１７】このように本実施例では請求項１に対応し
て、下部に掘削用開口部11を有する気密フード12内に斜
設したコンベヤ１と、このコンベヤ１の無端状帯体たる
チェーン９に設けられ外周に突出した複数の掘削刃10
と、コンベヤ１のチェーン９を回転駆動する回転駆動手
段29と、気密フード12内に設けられチェーン９の外周に
間隔をおいてほぼ平行に設けた底部案内面17Ａと、この
底部案内面17Ａの上部に気密フード12内に連通して設け
られ掘削刃10により底部案内面17Ａ上に掻き上げた泥土
Ｄを投入する投入口18を有する貯泥タンク19と、気密フ
ード12に接続された空気供給口23と、貯泥タンク19内の
泥土Ｄをパイプラインたる排泥管22を介して処理場に圧
送する圧送手段たるサンドポンプ20とを備えるものであ
るから、チェーン９の回転駆動により掘削刃10が泥土Ｄ
を気密フード12内の底部案内面17Ａに連続的に掻き上
げ、該泥土Ｄが気密フード12の気中雰囲気内にて水切り
され後、貯泥タンク19内に投入され、この含水率の低い
泥土Ｄが排泥管22を介して処理場に送られ、連続した高
濃度浚渫を行うことができる。そして底部案内面17Ａに
沿って掘削刃10が泥土Ｄを押し上げて運搬するコンベヤ
方式のものであるから、比較的構造簡易となり、また、
該掘削刃10に平板状のものを用いることができるため、
掘削刃10に泥土が付着しにくくなると共に、水を掻き揚
げにくくなり、また、掘削用開口部11から底部案内面17
Ａに掻き揚げた泥土Ｄを、該案内面17Ａ上部の貯泥タン
ク19に投入するため、揚泥距離が比較的短くなり、回転
駆動装置などの小型化及び軽量化も可能となる。そして
また、本実施例では、掘削刃10はその高さ寸法を短くで
きると共に、前後に隣合う掘削刃10の間隔を比較的長く
することができるため、より泥土Ｄの付着を防止するこ
とができる。また、掘削刃10は底部案内面17Ａに摺動す
るが、他部材は摺動部分が少ないため、部材の磨耗の心
配も少なくなる。また、浚渫装置本体Ｓの進行方向に向
かってチェーン９の運搬路９Ａが移動するため、底部案
内面17Ａ上の良好に泥土Ｄを掻揚げることができる。As described above, in this embodiment, according to claim 1, the conveyor 1 obliquely installed in the airtight hood 12 having the opening 11 for excavation at the bottom, and the chain 9 which is an endless belt of the conveyor 1 are provided. A plurality of drilling blades 10 provided on the
A rotary drive means 29 for rotationally driving the chain 9 of the conveyor 1, a bottom guide surface 17A provided in the airtight hood 12 and substantially parallel to the outer circumference of the chain 9 at intervals, and a bottom guide surface 17A of the bottom guide surface 17A. A mud storage tank 19 provided at the upper part in communication with the airtight hood 12 and having an input port 18 for inputting the mud D scraped up on the bottom guide surface 17A by the excavating blade 10, and an air supply connected to the airtight hood 12. Since the mouth 23 and the sand pump 20 which is the pressure feeding means for pressure feeding the mud D in the mud storage tank 19 to the processing site through the drainage pipe 22 which is a pipeline are provided, the excavating blade is driven by the rotation of the chain 9. 10 is mud D
Is continuously scraped up to the bottom guide surface 17A in the airtight hood 12, and the mud D is drained in the air atmosphere of the airtight hood 12 and then put into the mud storage tank 19 to obtain the mud having a low water content. D is sent to the treatment plant via the sludge discharge pipe 22, and continuous high-concentration dredging can be performed. Since the excavating blade 10 pushes up the mud D along the bottom guide surface 17A and conveys it, the structure is relatively simple.
Since it is possible to use a flat plate for the excavating blade 10,
It becomes difficult for mud to adhere to the excavating blade 10 and it is difficult to scoop up water, and the excavation opening 11 to the bottom guide surface 17
Since the mud D scooped up on A is put into the mud storage tank 19 above the guide surface 17A, the mud distance is relatively short, and the rotary drive device and the like can be made compact and lightweight. Further, in the present embodiment, the height dimension of the excavating blade 10 can be shortened, and the interval between the excavating blades 10 adjacent to each other in the front and rear can be made relatively long, so that the adhesion of the mud D can be further prevented. it can. Further, the excavating blade 10 slides on the bottom guide surface 17A, but since other members have few sliding portions, there is less fear of wear of the members. Further, since the transport path 9A of the chain 9 moves in the traveling direction of the dredging device body S, the mud D can be satisfactorily lifted on the bottom guide surface 17A.
【００１８】このように本実施例では請求項２に対応し
て、コンベヤ１と底部案内面17Ａとを一体的に傾動する
角度調整機構25を設けたものであるから、傾斜角度θを
小から大に調整することにより、薄層泥土から厚層泥土
の浚渫を行うことが可能となり、また、粘性の大きな泥
土Ｄを浚渫する場合は、前記傾斜角度θを小さくする
と、掘削刃10が垂直に近くなり、該掘削刃10への泥土Ｄ
の付着を一層防止することができる。As described above, in this embodiment, the angle adjusting mechanism 25 for integrally inclining the conveyor 1 and the bottom guide surface 17A is provided in accordance with the second aspect of the present invention. By adjusting it to a large value, it becomes possible to perform dredging of thick mud from thin mud, and in the case of dredging mud D having a large viscosity, if the inclination angle θ is reduced, the excavating blade 10 becomes vertical. It became close, and mud D to the excavating blade 10
Can be further prevented.
【００１９】また実施例上の効果として、チェーン９に
は底部案内面17Ａに対応して、斜設された運搬路９Ａを
有し、前後に隣合う前記掘削刃10，10の内端10Ａ，10Ａ
間が開口しているため、この開口から速やかに水抜きが
なされる。Further, as an effect of the embodiment, the chain 9 has a slanted conveying path 9A corresponding to the bottom guide surface 17A, and the inner ends 10A of the excavating blades 10, 10 adjacent in the front and rear, 10 A
Since the space is open, water can be drained quickly from this opening.
【００２０】図５は本発明の第２実施例を示し、上記第
１実施例と同一部分に同一符号を付し、その詳細な説明
を省略して詳述すると、この例では右側に幅大に形成し
た貯泥タンク19Ａを備えると共に、該貯泥タンク19Ａの
右側にサンドポンプ20を配置し、貯泥タンク19Ａ内に泥
土を右側に移送するスクリューコンベヤ43を設けた例を
示し、本発明の装置ではコンベヤ１の外部に貯泥タンク
19Ａを設けるものであるから、該貯泥タンク19Ａを大き
くすることができる。FIG. 5 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The present invention shows an example in which the mud storage tank 19A formed in 1 is provided, the sand pump 20 is arranged on the right side of the mud storage tank 19A, and the screw conveyor 43 for transferring the mud to the right side is provided in the mud storage tank 19A. In this device, a mud storage tank is installed outside the conveyor 1.
Since 19A is provided, the mud storage tank 19A can be enlarged.
【００２１】尚、本発明は上記実施例に限定されるもの
ではなく、本発明の要旨の範囲内において種々の変形実
施が可能であり、例えば実施例では無端状帯体にチェー
ンを用いるものを示したが、コンベヤと左右がほぼ同幅
ベルトを用いることもでき、この場合はベルトに掘削刃
を該ベルトの長さ方向に直交して設ければよい。また、
コンベヤの一部、例えば下部のスプロケット８や下部の
軸受５等をゴムなどでカバーすれば、耐久性及び耐磨耗
性が一層向上する。さらに実施例では圧送手段としてサ
ンドポンプを用いて説明したが、ピストン方式等の他の
方式のポンプを用いてもよい。The present invention is not limited to the above embodiment, but various modifications can be made within the scope of the present invention. For example, in the embodiment, a chain is used for the endless belt. Although shown, it is also possible to use a belt having substantially the same width on the left and right sides of the conveyor, and in this case, a digging blade may be provided on the belt at right angles to the length direction of the belt. Also,
If a part of the conveyor, for example, the lower sprocket 8 and the lower bearing 5 are covered with rubber or the like, the durability and abrasion resistance are further improved. Further, although the sand pump is used as the pressure feeding means in the embodiment, a pump of another type such as a piston type may be used.
【００２２】[0022]
【発明の効果】請求項１の発明は、下部に掘削用開口部
を有する気密フード内に斜設したコンベヤと、このコン
ベヤの無端状帯体に設けられ外周に突出した複数の掘削
刃と、前記コンベヤの無端状帯体を回転駆動する回転駆
動手段と、前記気密フード内に設けられ前記無端状帯体
の外周に間隔をおいてほぼ平行に設けた底部案内面と、
この底部案内面の上部に前記気密フード内に連通して設
けられ前記掘削刃により前記底部案内面上に掻き上げた
泥土を投入する投入口を有する貯泥タンクと、前記気密
フードに接続された空気供給口と、前記貯泥タンク内の
泥土をパイプラインを介して処理場に圧送する圧送手段
とを備えるものであり、構造簡易にして連続した高濃度
浚渫が可能な高濃度浚渫装置を提供することができる。According to the invention of claim 1, a conveyor obliquely installed in an airtight hood having a lower opening for excavation, and a plurality of excavating blades provided on an endless belt of the conveyor and protruding to the outer periphery, Rotational drive means for rotationally driving the endless belt of the conveyor, and a bottom guide surface provided in the airtight hood and provided substantially parallel to the outer circumference of the endless belt at intervals.
It was connected to the airtight hood, and a mud storage tank provided at the upper part of the bottom guide surface so as to communicate with the inside of the airtight hood and having a charging port for charging the mud scraped up on the bottom guide surface by the digging blade. A high-concentration dredging device having an air supply port and a pressure-feeding means for pressure-feeding the mud in the mud storage tank to a treatment site through a pipeline, and having a simple structure and capable of continuous high-concentration dredging. can do.
【００２３】請求項２の発明は、前記コンベヤと前記底
部案内面とを一体的に傾動する角度調整機構を設けたも
のであり、構造簡易にして連続した高濃度浚渫を可能と
し、さらに泥土の土質及び泥土層の厚さに合わせた浚渫
を行うことができる高濃度浚渫装置を提供することがで
きる。According to the second aspect of the present invention, an angle adjusting mechanism for integrally tilting the conveyor and the bottom guide surface is provided, and the structure is simplified to enable continuous high-concentration dredging. It is possible to provide a high-concentration dredging device capable of performing dredging adapted to the soil quality and the thickness of the mud layer.
【図１】本発明の第１実施例を示す断面図である。FIG. 1 is a sectional view showing a first embodiment of the present invention.
【図２】本発明の第１実施例を示す一部切欠平面図であ
る。FIG. 2 is a partially cutaway plan view showing the first embodiment of the present invention.
【図３】本発明の第１実施例を示す要部の正面図であ
る。FIG. 3 is a front view of the main part showing the first embodiment of the present invention.
【図４】本発明の第１実施例を示す掘削用開口部回りの
断面図である。FIG. 4 is a sectional view around the excavation opening showing the first embodiment of the present invention.
【図５】本発明の第２実施例を示す要部の正面図であ
る。FIG. 5 is a front view of a main part showing a second embodiment of the present invention.
１ コンベヤ ９ チェーン（無端状帯体） 10 掘削刃 11 掘削用開口部 12 気密フード 17Ａ 底部案内面 18 投入口 19 貯泥タンク 20 サンドポンプ（圧送手段） 22 排泥管（パイプライン） 23 空気供給口 25 角度調整機構 29 回転駆動手段 Ｄ 泥土 1 Conveyor 9 Chain (Endless Band) 10 Drilling Blade 11 Drilling Opening 12 Airtight Hood 17A Bottom Guide Surface 18 Input Port 19 Mud Storage Tank 20 Sand Pump (Pressurizing Means) 22 Mud Pipe (Pipeline) 23 Air Supply Mouth 25 Angle adjustment mechanism 29 Rotation drive means D Mud
Claims (2)
内に斜設したコンベヤと、このコンベヤの無端状帯体に
設けられ外周に突出した複数の掘削刃と、前記コンベヤ
の無端状帯体を回転駆動する回転駆動手段と、前記気密
フード内に設けられ前記無端状帯体の外周に間隔をおい
てほぼ平行に設けた底部案内面と、この底部案内面の上
部に前記気密フード内に連通して設けられ前記掘削刃に
より前記底部案内面上に掻き上げた泥土を投入する投入
口を有する貯泥タンクと、前記気密フードに接続された
空気供給口と、前記貯泥タンク内の泥土をパイプライン
を介して処理場に圧送する圧送手段とを備えることを特
徴とする高濃度浚渫装置。1. A conveyor obliquely installed in an airtight hood having a lower opening for excavation, a plurality of digging blades provided on an endless belt of the conveyor and protruding to the outer periphery, and an endless belt of the conveyor. A rotary drive means for rotating and driving, a bottom guide surface provided in the airtight hood substantially parallel to the outer circumference of the endless strip at intervals, and an upper part of the bottom guide surface in the airtight hood. A mud storage tank having a charging port for charging mud scraped up on the bottom guide surface by the drilling blade, an air supply port connected to the airtight hood, and mud in the mud storage tank. And a high-concentration dredging device, which includes a pressure-feeding unit that pressure-feeds the water to a treatment site through a pipeline.
的に傾動する角度調整機構を設けたことを特徴とする請
求項１記載の高濃度浚渫装置。2. The high-concentration dredging device according to claim 1, further comprising an angle adjusting mechanism for integrally tilting the conveyor and the bottom guide surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7037408A JP2770765B2 (en) | 1995-02-24 | 1995-02-24 | High concentration dredging equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7037408A JP2770765B2 (en) | 1995-02-24 | 1995-02-24 | High concentration dredging equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08232293A true JPH08232293A (en) | 1996-09-10 |
| JP2770765B2 JP2770765B2 (en) | 1998-07-02 |
Family
ID=12496707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7037408A Expired - Lifetime JP2770765B2 (en) | 1995-02-24 | 1995-02-24 | High concentration dredging equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2770765B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090229631A1 (en) * | 2008-03-12 | 2009-09-17 | Compagnie Du Sol | scraper machine |
| JP2018514676A (en) * | 2015-05-08 | 2018-06-07 | アカボティクス，リミティド ライアビリティ カンパニー | Miniature saddle system and method using the same |
| CN111688871A (en) * | 2020-06-03 | 2020-09-22 | 唐杰 | Ocean engineering sea mud short distance conveyor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0820694A (en) * | 1994-07-07 | 1996-01-23 | Kanegafuchi Chem Ind Co Ltd | Reinforced flame retardant thermoplastic resin composition |
-
1995
- 1995-02-24 JP JP7037408A patent/JP2770765B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0820694A (en) * | 1994-07-07 | 1996-01-23 | Kanegafuchi Chem Ind Co Ltd | Reinforced flame retardant thermoplastic resin composition |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090229631A1 (en) * | 2008-03-12 | 2009-09-17 | Compagnie Du Sol | scraper machine |
| US8276600B2 (en) * | 2008-03-12 | 2012-10-02 | Compagnie Du Sol | Scraper machine |
| JP2018514676A (en) * | 2015-05-08 | 2018-06-07 | アカボティクス，リミティド ライアビリティ カンパニー | Miniature saddle system and method using the same |
| CN111688871A (en) * | 2020-06-03 | 2020-09-22 | 唐杰 | Ocean engineering sea mud short distance conveyor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2770765B2 (en) | 1998-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102005683B1 (en) | A dredging machine for a drain pipeline | |
| JP2770765B2 (en) | High concentration dredging equipment | |
| JP2865909B2 (en) | High concentration dredging equipment | |
| JPH09144057A (en) | Dredging method of water channel | |
| JP3341280B2 (en) | High concentration dredging equipment | |
| JP4348687B2 (en) | Dredge equipment | |
| JPS61257540A (en) | Bucket for dredging work | |
| CN113389233A (en) | River channel dredging equipment | |
| JPS63156127A (en) | Dredging apparatus | |
| JPH0673757A (en) | Dredger | |
| CN113417328B (en) | River channel dredging equipment with silt dewatering mechanism | |
| JPH09302713A (en) | Deposit take-in equipment for underwater working machine | |
| JP3332759B2 (en) | Sediment intake device for underwater work machine | |
| US894713A (en) | Excavating apparatus. | |
| JP2872498B2 (en) | Dredging equipment | |
| JP2872503B2 (en) | Dredging equipment | |
| JPH0689557B2 (en) | Dredging device | |
| JPH07224446A (en) | Muddy earth sucking device | |
| JP2872500B2 (en) | Dredging equipment | |
| JP2798163B2 (en) | Dredging equipment | |
| JPH04146333A (en) | Dredging equipment | |
| JP2001279708A (en) | Sludge scraper for dredger | |
| JPH03227796A (en) | Bucket wheel type dredging vessel | |
| JPH06280283A (en) | Dredging bucket | |
| NL8801344A (en) | METHOD AND APPARATUS FOR HIGH DENSITY DREDGING DREDGING |