JPS61169534A - Dredging of ground of soft soil-deposited sandy soil - Google Patents
Dredging of ground of soft soil-deposited sandy soilInfo
- Publication number
- JPS61169534A JPS61169534A JP745185A JP745185A JPS61169534A JP S61169534 A JPS61169534 A JP S61169534A JP 745185 A JP745185 A JP 745185A JP 745185 A JP745185 A JP 745185A JP S61169534 A JPS61169534 A JP S61169534A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- suction pipe
- sandy soil
- pipe
- water
- 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.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/92—Digging elements, e.g. suction heads
- E02F3/9206—Digging devices using blowing effect only, like jets or propellers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
- E02F3/92—Digging elements, e.g. suction heads
- E02F3/9287—Vibrating suction heads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
本発明は表−に軟弱土がその下層に透水性の良い砂質土
がそれぞれ存在する水底地盤を浚渫するに際して、軟弱
土の混入を極力抑えて砂質土だけを掘削・揚土して当該
地盤以外の場所に再利用可能に堆積せしめる砂質土に軟
弱土が堆積した地盤の浚渫方法に関するものである。When dredging underwater ground where soft soil exists on the surface and sandy soil with good permeability exists underneath, the present invention minimizes the mixing of soft soil and excavates and lifts only the sandy soil. This invention relates to a method of dredging ground where soft soil is deposited on sandy soil that can be deposited in a place other than the ground so that it can be reused.
一般に港内やそこに至る沿岸航路には長年に亘って河川
から土砂特に軟弱粘性土、軟弱シルト。
ヘドロ等の軟弱土が流入して水深が浅くなって船の出入
に支障を来たし、港の機能が著しく損なわれている。そ
こでそれらの水深を確保するために数年毎に維持浚渫が
行なわれている。この維持浚渫は水底の土砂、堆積物を
排出して水深を深めることが主目的であるから水底の表
層から浚渫し、浚渫土は投棄による環境汚染の防止と有
効利用とを兼ねて海上の一部を締め切った埋立地に投入
しているのが現状である。しかしながら維持浚渫が行な
われる場所では前記の如く通常軟弱土が堆積しているか
ら、埋立地に投入される浚渫上は殆んど軟弱土であり、
従ってこのような軟弱土で造成された埋立地は地盤が緩
いために工場や住宅用地等に有効利用するには非常に長
い期間を経なければならないか、軟弱地盤を早期に改良
するために実大な費用を必要とする等の問題点があった
。
また埋立造成を目的としてそれに必要な土砂を浚渫によ
り得ようとする場合、埋立用土砂としては良質な砂質土
が要求されるが、浚渫地は多くの場合維持浚渫の場合と
同様に軟弱土が表層に堆積しており、このような浚渫地
で砂質土を浚渫土として得るには先ず表層の軟弱土を浚
渫して排除する必要がある。しかしながらこの軟弱土を
埋立地以外の例えば外洋に投棄すると環境を汚染するこ
とになるから、結局表層の軟弱土も砂質土と共に浚渫し
て埋立地に投入しているのが現状であり、従って前記維
持浚渫の浚渫土を投入した埋立地と大同小異なものとな
り、工期の長期化又は費用の増大等の同様な問題があっ
た。
また最近、吸入パイプの中間にブースターポンプが設置
されている大深度用の浚渫装置が製作され、それを使用
して軟弱土層の正否の砂質土を採取する工法も行なわれ
ているが、この装置は長大な吸入パイプをワイヤーでラ
ダーから斜めに吊り下げているだけであってスイングし
ながら表層から浚渫する方法を採るから、軟弱土層を浚
渫しないで貫通させるようなことは出来ず、従って吸入
パイプの吸入口が砂質土１に達するまでの間の浚渫によ
って軟弱土が混入することを避けることが出来ない問題
点があった。In general, the inside of ports and the coastal routes leading to them have been covered with sediment from rivers for many years, especially soft cohesive soil and soft silt. The inflow of sludge and other soft soil has made the water shallower, making it difficult for ships to enter and leave the port, and the port's functionality has been significantly impaired. Therefore, maintenance dredging is carried out every few years to maintain the water depth. The main purpose of this maintenance dredging is to deepen the water depth by discharging sand and sediment from the bottom of the water, so it is dredged from the surface layer of the bottom of the water, and the dredged soil is used to prevent environmental pollution caused by dumping and to use it effectively. Currently, the waste is being disposed of in a closed landfill. However, in areas where maintenance dredging is carried out, soft soil is usually deposited as described above, so the dredged material that is thrown into the reclaimed land is mostly soft soil.
Therefore, reclaimed land created with such soft soil has a very loose ground and must be used for a very long period of time before it can be used effectively for factories or housing, or it must be carried out in order to improve the soft ground as soon as possible. There were problems such as the large cost required. In addition, when obtaining the necessary soil for the purpose of reclamation by dredging, good quality sandy soil is required as the reclamation soil, but in many cases dredged areas are made of soft soil as in the case of maintenance dredging. is deposited on the surface layer, and in order to obtain sandy soil as dredged soil in such a dredged area, it is first necessary to dredge and remove the soft soil on the surface layer. However, if this soft soil is dumped in a place other than a landfill site, for example, in the open ocean, it will pollute the environment, so the current situation is that the soft soil at the surface layer is dredged together with sandy soil and dumped into a landfill site. The landfill site was very different from the one into which the dredged soil was put in during the maintenance dredging, and there were similar problems such as lengthening the construction period and increasing costs. Recently, a dredging device for deep depths with a booster pump installed in the middle of the suction pipe has been manufactured, and a method is being used to collect sandy soil from soft soil layers. This device simply suspends a long suction pipe diagonally from the ladder with a wire, and uses a method of dredging from the surface layer while swinging, so it is not possible to penetrate soft soil layers without dredging. Therefore, there was a problem in that it was impossible to avoid mixing of soft soil due to dredging until the suction port of the suction pipe reached the sandy soil 1.
本発明は上記従来技術の問題点を解決して砂質土だけを
浚渫することの出来る砂質土に軟弱土が堆積した地盤の
浚渫方法に関するものであって、表層に軟弱土がその下
層に砂質土がそれぞれ存在する水底地盤を浚渫するに際
し、下端部に吸入口が設けられている吸入パイプを下降
せしめ、該下端部が軟弱土を貫通した後に該吸入パイプ
の上端部に設けられた起振装置により振動を与えると共
に下端部より高圧水を噴射して砂質土を掘削しながら吸
入パイプに設けられた揚力付与手段により砂質土を水と
共に吸入口より吸入パイプを経て水上に揚土排出して当
該地盤以外の場所に再利用可能に堆積せしめ、次いで掘
削及び下降を停止して起振装置により振動を与えながら
吸入パイプを引き抜くことを特徴とする。
以下、本発明方法を図面によって詳細に説明する。
第１図は本発明方法の１実施例を透視的に示す正面説明
図、第２図は１列に配置した複数基の吸入パイプを同時
に使用する本発明方法の実施状態を示す側面説明図であ
る。
本発明方法を実施するには、地盤中を下降させなから砂
質土を掘削して揚土するための次の如き機能を備えた吸
入パイプ、すなわち、下端部に吸入口が設けられており
、上端部には起振装置がまた下端部には高圧水を噴射す
るためのジェットノズルがそれぞれ設けられていると共
に砂質土を吸入パイプ自体を経て揚土させるための揚力
付与手段が設けられていて上部に排出口を有しており、
上下に移動可能な吸入パイプを準備する。
その１例を第１図及び第２図により説明する。１は吸入
パイプであって、その下端部には吸入口２とジェットノ
ズル３がそれぞれ設けられている。
ジェットノズル３はこれから高圧水を噴射するために、
ウォータージェットポンプ４に連通されている。吸入パ
イプ１の上端部には起振装置５が設けられている。揚力
付与手段としては例えば水中サンドポンプも使用できる
が本例では吸入口２付近の吸入パイプ１内に設けられた
エアー吹出口６とこれに連通しているコンプレッサー７
とから成るエアーリフトポンプが使用されている。そし
て揚土された砂質土を排出する排出管８が吸入パイプ１
の上部に連通して設けられているこの排出管８は吸入パ
イプ１が上下に移動しても連通状態を維持できるように
図示した実施例ではフレキシブルパイプで構成されてい
る。砂質土の排出先は本例では土運船９となっているが
、例えば陸上に設けられた排出地や直接に埋立地であっ
ても良い。
土運船９を使用する場合は土運船９に流入する水を高圧
水として再利用するための吸水管１０をウォータージェ
ットポンプ４の吸水口に取り付けることが軟弱±１３を
乱さないので好ましい。そしてこのように構成された吸
入パイプ１は付属するウォータージェットポンプ４．コ
ンプレッサー７、吸水管１０等を除いて上下に移動可能
なように頂部で起振装置５を介してフレーム１１に懸吊
装置により懸吊されている。そして位置移動容易なよう
に通常は浚渫船１２に懸吊されており、作業時には浚渫
船１２を貫通して上下に移動する。このような吸入パイ
プ１基だけでも本発明方法を実施することが出来るが、
作業能率を高めるために第２図の如く複数基が１列に、
更には複数列配置しておくことが好ましい。The present invention solves the problems of the prior art described above and relates to a method for dredging ground where soft soil is deposited on sandy soil, by which only sandy soil can be dredged. When dredging underwater ground where sandy soil exists, a suction pipe with an inlet at the lower end is lowered, and after the lower end has penetrated the soft soil, a suction pipe is installed at the upper end of the suction pipe. While excavating the sandy soil by applying vibrations using a vibrating device and injecting high-pressure water from the lower end, the sandy soil is lifted up along with water from the suction port through the suction pipe using the lifting force applying means provided on the suction pipe. The method is characterized in that the soil is discharged and deposited in a place other than the ground so that it can be reused, and then the excavation and lowering are stopped and the suction pipe is pulled out while being vibrated by a vibrating device. Hereinafter, the method of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a front explanatory view showing an embodiment of the method of the present invention in perspective, and FIG. 2 is an explanatory side view showing an implementation state of the method of the present invention in which a plurality of suction pipes arranged in one row are used simultaneously. be. In order to carry out the method of the present invention, a suction pipe is provided with the following functions for excavating and lifting sandy soil without descending into the ground, that is, a suction port is provided at the lower end. The upper end is provided with an oscillating device, and the lower end is provided with a jet nozzle for injecting high-pressure water, and is provided with lifting force applying means for lifting sandy soil through the suction pipe itself. It has a discharge port at the top.
Prepare a suction pipe that can be moved up and down. One example will be explained with reference to FIGS. 1 and 2. Reference numeral 1 denotes a suction pipe, and a suction port 2 and a jet nozzle 3 are provided at the lower end of the pipe. Jet nozzle 3 will now spray high-pressure water.
It is connected to a water jet pump 4. A vibration device 5 is provided at the upper end of the suction pipe 1 . For example, a submersible sand pump can be used as the lift applying means, but in this example, an air outlet 6 provided in the suction pipe 1 near the inlet 2 and a compressor 7 communicating therewith are used.
An air lift pump consisting of The discharge pipe 8 for discharging the lifted sandy soil is the suction pipe 1.
This discharge pipe 8, which is provided in communication with the upper part of the suction pipe 1, is constructed of a flexible pipe in the illustrated embodiment so that it can maintain communication even when the suction pipe 1 moves up and down. Although the sandy soil is discharged to the soil transport ship 9 in this example, it may be discharged to a discharge site on land or directly to a landfill, for example. When using the soil transport vessel 9, it is preferable to attach a water suction pipe 10 for reusing the water flowing into the soil transport vessel 9 as high-pressure water to the water intake port of the water jet pump 4 so as not to disturb the softness ±13. The suction pipe 1 configured as described above is connected to the attached water jet pump 4. Except for the compressor 7, water suction pipe 10, etc., the components are suspended from the frame 11 via a vibration device 5 at the top by a suspension device so as to be movable up and down. It is usually suspended on a dredger 12 so that it can be moved easily, and during work, it passes through the dredger 12 and moves up and down. Although the method of the present invention can be carried out with just one such suction pipe,
In order to increase work efficiency, multiple units are arranged in one line as shown in Figure 2.
Furthermore, it is preferable to arrange a plurality of rows.
以上の如く設置された吸入パイプ１を使用して本発明方
法は次のように実施される。すなわち、先ず上記浚渫船
１２を表層に軟弱土１３がその下層に砂質土１４がそれ
ぞれ存在する目的の場所に曳航して所定位置に位置せし
める。このときまで水面上に引き揚げられている吸入パ
イプ１を懸吊装置の 。
操作により下降せしめる。吸入パイプ１は下降を続けて
水底に達するが、表層の軟弱土１３は軟弱であるから自
重によりそのまま軟弱±１３中を下降して第１図の如（
下端部が軟弱±１３を貫通する。この場合ジェットノズ
ル３及びエアー吹出口６を軟弱土で詰らせないようにそ
れぞれ水及びエアーを少愚噴射させながら下降させるの
が好ましい。吸入パイプ１の下端部が軟弱±１３を貫通
した後に起振装置５を作動させて吸入パイプ１に振動を
与えると共にウォータージェットポンプ４を作動させて
下端部のジェットノズル３から高圧水を噴射することに
より軟弱土１３の下の砂質土１４を掘削する。
このような掘削作業と同時にコンプレッサー７によって
発生させた圧縮空気をエアー吹出口６から吸入パイプ１
内に吹き出させることによりエアーリフトポンプの作用
を起こさせて掘削された砂質土１４を水と共に吸入口２
から吸入パイプ１内を上方に揚土し、第１図に示す如く
排出管８から排出させる。このようにして砂質土１４を
吸入パイプ１の下端部で掘削して揚土させると吸入パイ
プ１の先端部周辺の砂質土１４がなくなって吸入パイプ
１は自重で下降を続ける。このようにして吸入パイプ１
が砂質土１４を掘削、揚土しながら下降するに従い、掘
削域の軟弱土１３は吸入パイプ１の上端部周囲に生じた
間隙を埋めるように沈降して行く。
どの深度にまで吸入パイプ１を下降せしめるかは、浚渫
程度或は必要とする砂質土１４の量によって異なり、こ
れらは更に現地地盤構成や地形によっても影響されるか
ら、場合に応じて適切に定められる。吸入パイプ１が所
定の深度にまで達したときは、次いで懸吊装置の操作に
より吸入パイプ１の下降従って掘削を停止し、逆に懸吊
装置により上方に吸入パイプ１を吊り揚げて引き抜く。
この引き抜きを起振装置５により振動を吸入パイプ１に
与えながら行なうことにより引き抜きを容易にすると共
に軟弱±１３に振動を伝えて吸入パイプ１の引抜跡への
軟弱土１３の流入を容易にし、堆積状態を良好にするこ
とが出来る。このようにして掘削域において表層の軟弱
土１３を下方に移動させただけでそのまま残し、その下
層を成していた砂質土１４だけを浚渫して排出するので
ある。このようにして１つの地点での掘削域の浚渫が終
れば、浚渫船１２を次々に掘削域が連続するように隣接
位置に移動させて同じことを繰り返してゆくと、第１図
の如く浚渫された水底が形成されるのである。こ
′の場合、第２図の如く複数基の吸入パイプ１を１列
に各掘削域が連続するように各基間の間隔を狭く配置し
て実施すると一度に広い幅で浚渫することが出来る。
【効果］
本発明方法によれば港内、沿岸航路の維持浚渫や埋立用
土砂採取のために行なう浚渫において、砂質上上に堆積
した軟弱土の混入を極力抑えて下層の良質な砂質土だけ
を掘削排出することができる。従って地盤改良工事など
の必要がなくて早期に有効利用可能となる埋立地を造成
するためなどの埋立用土砂を提供することが出来、特に
維持浚渫の場合−石二鳥の効果を有し、産業上貢猷する
ところ大である。The method of the present invention is carried out as follows using the suction pipe 1 installed as described above. That is, first, the dredger 12 is towed to a desired location where soft soil 13 exists on the surface layer and sandy soil 14 exists below it, and the dredger 12 is positioned at a predetermined position. At this point, the suction pipe 1, which has been raised above the water surface, is placed on a suspension device. It is lowered by operation. The suction pipe 1 continues to descend and reaches the bottom of the water, but since the soft soil 13 on the surface layer is soft, it continues to descend through the soft soil 13 due to its own weight as shown in Figure 1 (
The lower end passes through the soft spot ±13. In this case, it is preferable to lower the jet nozzle 3 and the air outlet 6 while spraying a small amount of water and air, respectively, so as not to clog the jet nozzle 3 and the air outlet 6 with soft soil. After the lower end of the suction pipe 1 passes through the soft zone 13, the vibration device 5 is activated to give vibration to the suction pipe 1, and the water jet pump 4 is activated to inject high-pressure water from the jet nozzle 3 at the lower end. As a result, the sandy soil 14 below the soft soil 13 is excavated. At the same time as this excavation work, the compressed air generated by the compressor 7 is transferred from the air outlet 6 to the suction pipe 1.
The sandy soil 14 that has been excavated is blown into the suction port 2 along with water by causing the action of the air lift pump.
The soil is lifted upward through the suction pipe 1 and discharged from the discharge pipe 8 as shown in FIG. When the sandy soil 14 is excavated and lifted at the lower end of the suction pipe 1 in this manner, the sandy soil 14 around the tip of the suction pipe 1 disappears, and the suction pipe 1 continues to descend under its own weight. In this way, suction pipe 1
As the sandy soil 14 is excavated and lifted up, the soft soil 13 in the excavated area sinks to fill the gap created around the upper end of the suction pipe 1. The depth to which the suction pipe 1 is lowered depends on the degree of dredging and the amount of sandy soil 14 required, and these are further influenced by the local ground composition and topography, so it may be necessary to lower the suction pipe 1 appropriately depending on the case. determined. When the suction pipe 1 reaches a predetermined depth, the suspension device is operated to stop the suction pipe 1 from lowering and therefore the excavation, and conversely, the suction pipe 1 is lifted upward by the suspension device and pulled out. By performing this pulling while applying vibration to the suction pipe 1 using the vibrating device 5, the pulling is facilitated, and the vibration is transmitted to the soft soil 13 to facilitate the flow of the soft soil 13 into the pulled-out trace of the suction pipe 1. The deposition condition can be improved. In this way, in the excavated area, the soft soil 13 at the surface layer is simply moved downward and left as is, and only the sandy soil 14 forming the underlying layer is dredged and discharged. When the dredging of the excavation area at one point is completed in this way, the dredger 12 is moved to the adjacent position one after another so that the excavation area is continuous and the same process is repeated until the dredging is completed as shown in Figure 1. This results in the formation of an underwater bottom. child
In the case of ', if a plurality of suction pipes 1 are arranged in a row with narrow intervals between each suction pipe 1 so that each excavation area is continuous as shown in FIG. 2, a wide width can be dredged at one time. [Effects] According to the method of the present invention, when dredging is carried out for maintenance dredging of ports and coastal channels or for collecting soil for reclamation, the mixing of soft soil deposited on top of sandy soil can be suppressed as much as possible, and the lower layer of good quality sandy soil can be removed. Only the excavation can be discharged. Therefore, it is possible to provide reclamation soil for creating reclaimed land that can be used effectively at an early stage without the need for ground improvement work, and especially in the case of maintenance dredging, it has the effect of killing two birds. There is a great deal of opportunity for industrial tribute.
第１図は本発明方法の１実施例を透視的に示す正面説明
図、第２図は１列に配置した複数基の吸入パイプを同時
に使用する本発明方法の実施状態を示す側面説明図であ
る。
１・・・・吸入パイプ
２・・・・吸入口
３・・・・ジェットノズル
４・・・・ウォータージェットポンプ
５・・・・起振装置
６・・・・エアー吹出ロ
ア・・・・コンプレッサー
８・・・・排出管
９・・・・土運船
１０・・・・吸水管
１１・・・・フレーム
１２・・・・浚渫船
１３・・・・軟弱土
１４・・・・砂質土
第１図FIG. 1 is a front explanatory view showing an embodiment of the method of the present invention in perspective, and FIG. 2 is an explanatory side view showing an implementation state of the method of the present invention in which a plurality of suction pipes arranged in one row are used simultaneously. be. 1... Suction pipe 2... Suction port 3... Jet nozzle 4... Water jet pump 5... Oscillating device 6... Air blowing lower... Compressor 8...Discharge pipe 9...Earth carrier 10...Suction pipe 11...Frame 12...Dredger 13...Soft soil 14...Sandy soil No. Figure 1
Claims (1)
る水底地盤を浚渫するに際し、下端部に吸入口が設けら
れている吸入パイプを下降せしめ、該下端部が軟弱土を
貫通した後に該吸入パイプの上端部に設けられた起振装
置により振動を与えると共に下端部より高圧水を噴射し
て砂質土を掘削しながら吸入パイプに設けられた揚力付
与手段により砂質土を水と共に吸入口より吸入パイプを
経て水上に揚土排出して当該地盤以外の場所に再利用可
能に堆積せしめ、次いで掘削及び下降を停止して起振装
置により振動を与えながら吸入パイプを引き抜くことを
特徴とする砂質土に軟弱土が堆積した地盤の浚渫方法。1 When dredging underwater ground where soft soil exists at the surface layer and sandy soil at the bottom layer, a suction pipe with an inlet at the lower end is lowered, and after the lower end penetrates the soft soil, the suction pipe is dredged. A vibrating device installed at the upper end of the suction pipe applies vibrations, and high-pressure water is injected from the lower end to excavate sandy soil, while the lifting force applying means installed at the suction pipe suctions the sandy soil together with water. The soil is pumped up and discharged from the mouth onto the water through a suction pipe, deposited in a place other than the ground for reuse, and then the excavation and descent are stopped and the suction pipe is pulled out while being vibrated by a vibrating device. A dredging method for ground where soft soil is deposited on sandy soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP745185A JPS61169534A (en) | 1985-01-21 | 1985-01-21 | Dredging of ground of soft soil-deposited sandy soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP745185A JPS61169534A (en) | 1985-01-21 | 1985-01-21 | Dredging of ground of soft soil-deposited sandy soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61169534A true JPS61169534A (en) | 1986-07-31 |
Family
ID=11666189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP745185A Pending JPS61169534A (en) | 1985-01-21 | 1985-01-21 | Dredging of ground of soft soil-deposited sandy soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61169534A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1022719C2 (en) * | 2003-02-18 | 2004-08-19 | Cubic Square B V | Dredging device, comprises suction lances for passing through upper silt layer and into lower silt layer |
| US7628097B2 (en) | 2006-02-20 | 2009-12-08 | Honda Motor Co., Ltd. | Bolt-tightening tool |
| US20140215865A1 (en) * | 2013-02-04 | 2014-08-07 | Ronald G. Walters | Vibrating agitator attachment for Toyo dredge pumps |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5069788A (en) * | 1973-10-03 | 1975-06-10 | ||
| JPS56159435A (en) * | 1980-05-13 | 1981-12-08 | Shigeo Takamura | Dredging method using dragline type water injecting pressure air mixing pump |
| JPS5915135A (en) * | 1982-07-13 | 1984-01-26 | Penta Ocean Constr Co Ltd | Sludge dredger |
-
1985
- 1985-01-21 JP JP745185A patent/JPS61169534A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5069788A (en) * | 1973-10-03 | 1975-06-10 | ||
| JPS56159435A (en) * | 1980-05-13 | 1981-12-08 | Shigeo Takamura | Dredging method using dragline type water injecting pressure air mixing pump |
| JPS5915135A (en) * | 1982-07-13 | 1984-01-26 | Penta Ocean Constr Co Ltd | Sludge dredger |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1022719C2 (en) * | 2003-02-18 | 2004-08-19 | Cubic Square B V | Dredging device, comprises suction lances for passing through upper silt layer and into lower silt layer |
| US7628097B2 (en) | 2006-02-20 | 2009-12-08 | Honda Motor Co., Ltd. | Bolt-tightening tool |
| US20140215865A1 (en) * | 2013-02-04 | 2014-08-07 | Ronald G. Walters | Vibrating agitator attachment for Toyo dredge pumps |
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