JPH0960034A - Thin layer dredging and discharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve dredging work efficiency by composing a thin layer dredging and discharging device of a dredging device, a lifting device which raises and lowers the dredging device which is loaded on a crawler which can freely traverse on the dredger and a discharging device which pneumatically conveys the dredged matter. SOLUTION: A dredging device 40 is lifted down to the bottom of the water while operating a lifting device 20, and a crawler is moved while operating a suction pump 42 and mixer 52. In the next step, the soft mud in the range covered by a water stop hood 50 is mixed to be liquidized by the mixer 52 and sucked in the suction pump 42 through a flexible pipe 46 and suction pipe 44, being discharged from a discharge pipe 62. In the next step, the soft mud which came out from the discharge pipe 62 is applied pressure by compressed air, being pneumatically plug carried through a discharge pipe 70. Since the moisture content of the soft mud covered by the water stop hood 50 is lowest at the beginning of take-in and then gradually rises, causing an undesirable matter, a opening closing valve 64 is intermittently operated so as to be opened only in the case of high concentration in the soft mud for discharge, achieving efficient dredging and conveyance at a high concentration using water as little as possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-layer dredging and discharging device for dredging soft mud accumulated on the bottom of water such as a harbor, lake, river, etc. The present invention relates to a thin-layer dredging / discharging device capable of efficiently dredging only soft mud and continuously transferring a large amount to a remote destination.

[0002]

2. Description of the Related Art As a conventional dredging apparatus, there is a pump type. In this pump-type dredging apparatus, a large-capacity pump is installed on a barge, a dredger, or the like, a hose is extended from the pump to the bottom of the sea or lake, and the soft mud deposited on the bottom is sucked up together with the water. Further, as another dredging device, a grab bucket type dredging device for opening and closing a grab bucket at the bottom of the water to scoop and a recently developed vertical screw conveyor type dredging device are also used. Then, the soft mud thus dredged is mainly carried to a landfill by a carrier ship called an earth carrier. At the landfill site, a solidifying agent and a coagulant are added to solidify.

[0003]

However, among the above-mentioned dredging devices, in the pump-type dredging device, the amount of water sucked up simultaneously with the soft mud is too large and the solidifying agent is mixed only after the treatment of residual water. However, there is a drawback that the wastewater treatment requires a great deal of cost. In addition, the grab-bucket type dredging device has a drawback that it pollutes the ocean in the dredging area, and the vertical screw conveyor type dredging device uses only a small amount of water for the thick soft mud layer to increase the amount of soft mud. Although it has the advantage of being able to continuously dredge a large amount at a concentration, it has the disadvantage that it is not suitable for thin-layer dredging when the thickness of the soft mud layer is small and the amount of water that accompanies it is large.

[0004]

[Means for Solving the Problems] By solving such a problem, the water accompanying the thin soft mud layer is reduced as much as possible, and only the soft mud is highly concentrated continuously and at a remote purpose. In order to stably convey to the ground, in the first invention, in the first invention, the dredging device installed on the dredging ship and the crawler that is equipped with the dredging device and is traversable on the dredging ship are loaded. The lifting device for raising and lowering the dredging device, and the discharging device connected to the dredging device for pneumatically transporting the dredged material, the dredging device being a suction pipe connected to a cylindrical suction pipe and an upper end of the suction pipe. A pump, a circular lid-shaped water stop hood that is tiltably disposed at the lower end of the suction pipe, a tilting hydraulic cylinder of the water stop hood mounted midway in the suction pipe, and the water stop hood. It is housed inside and is equipped with a plurality of stirring rods facing downward. And a discharge motor connected to the discharge port of the suction pump of the dredging device and provided in the middle of the discharge pipe. The thin-layer dredging and discharging device is provided with the on-off valve and the ejector of compressed air. And in 2nd invention, the raising / lowering apparatus of 1st invention was formed in the backhoe. Further, in the third invention, the first and second
The water-proof hood of the invention is formed by bending in a reverse shape at the central portion. Further, according to a fourth aspect of the present invention, in the above invention, the suction port of the suction pipe and the water blocking hood are connected by a flexible pipe, and the suction port is provided with a bar screen for preventing foreign matter from entering. Further, in the fifth invention, a gamma ray densitometer or a transparent monitoring tube is provided in the middle of the discharge tube.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a dredging device is lowered from a dredging ship moored at a dredging site to a thin-layer soft mud layer at the bottom of the water by an elevating device, and a waterproofing hood is covered with the thin-layer soft mud layer to provide a stirring device. To drive. The soft mud stirred and fluidized by the stirring rod of the stirring device moves toward the suction pipe by the suction force due to the rotation of the suction pump, is sucked up by the suction pipe, exits the discharge pipe, and flows in the discharge pipe of the discharge device. The compressed air injected from the ejector transports the plug inside the discharge pipe and transfers it to a remote destination. As described above, when the traveling equipment is sequentially moved on the dredger to repeat the dredging work and the work in the certain dredging work area is completed, the dredger is moved to the next work site and the same work is repeated again.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention, FIG. 1 is an overall side view of a thin layer dredging and discharging device, FIG. 2 is an enlarged side view of a main portion of the thin layer dredging and discharging device, and FIG. FIG. 4 is an enlarged front view of the main part of the dredging and discharging device, and FIG. 4 is an explanatory diagram for explaining the opening and closing procedure of the opening and closing valve in the middle of the discharging pipe.

The thin-layer dredging and discharging device 100 includes an elevating device 20 movably mounted on the dredger 10 and an elevating device 20.
It is composed of a dredging device 40 that is connected to the tip of the seabed and collects the sludge A deposited on the seabed B, and a discharge device 60 that transfers the dredged sludge to a remote destination. 1, the lifting device 20 includes a crawler 20a.
A backhoe 20A that is rotatably attached to the backhoe is used. A dredging device 40 is attached to the tip of the backhoe 20A that is the elevating device 20, and the soft mud collected by the dredging device 40 is transported over a long distance by a subsequent discharging device 60.

As shown in FIG. 2 and FIG. 3, the dredging device 40 has a bracket 41a erected on a body 41, and a lifting device 20 (backhoe 20A) and a hydraulic cylinder 20b are pin-joined to the body 41 so that the body 41 is tilted downward. Cylinder 50A
The water stop hood 50 which can be tilted by the operation of is installed.
The water-stop hood 50 is bent in a circular shape in a plan view and in an inverted V shape in a side view, and a stirring device 52 in which a plurality of stirring rods 52a are attached downward to a horizontal disc is provided in the lower inside thereof. A stirring motor (hydraulic motor) 54 is rotatably arranged around the vertical axis. On the other hand, above the body 41,
The suction pump 42 and the hydraulic motor 42a are fixedly installed, and the suction pipe 44 and the top plate of the water blocking hood 50 are connected by a flexible pipe 46. Further, immediately before the flexible pipe, a bar screen 56 for removing foreign matter is provided. Is installed.

As shown in FIG. 2, the discharge device 60 is connected to a discharge side of the suction pump 42 and is connected to a discharge pipe 62 via a discharge valve 70 and a check valve 66. An ejector 68 for injecting compressed air is provided, and the dredged soft mud is transported by air to a distant destination by plug transportation.

Next, the operation of the present invention constructed as above will be described. First, the dredging vessel 10 is anchored at a desired dredging site, and the lifting device 20 is operated to gently lower the dredging device 40 to the bottom of the water. After that, the water stop hood 50 is adjusted horizontally by the tilting cylinder 50A so that the rear side is horizontal and the front side is obliquely upward according to the traveling direction of the crawler 20a, and then the suction pump 42 and the stirring device 52 are operated. While moving the crawler 20a. The soft mud in the range covered with the waterproof hood 50 is stirred and fluidized by the stirring device 52 rotating inside the waterproof hood 50, and passes through the flexible pipe 46 and the suction pipe 44 at one end of the waterproof hood 50. Is sucked into the suction pump 42 and discharged from the discharge pipe 62. Foreign substances (wood, iron pieces, algae, plastic containers, etc.) that accompany the inhaled soft mud cannot pass through the bar screen 56 and are removed. The soft mud discharged from the discharge pipe 62 is pressurized by compressed air in the discharge pipe 70 and is transported by plug, and is transported from the dredger 10 to a distant destination. Crawler 20
When a is reversed by the dredger 10 and moves in the opposite direction, the inclination of the water stop hood 50 is also reversed and the same work is repeated. In the present invention, since the soft mud is transported at a high concentration (only the soft mud is reduced with the accompanying water as small as possible), the work is carried out, for example, in the step shown in FIG. That is, the still water hood 5
The soft mud in 0 has the smallest water content at the beginning of intake, and the water content gradually increases as the intake progresses, which is not preferable. Therefore, the open / close valve 64 is set to the intermittent operation.
As shown in FIG. 4, the open / close valve 64 is opened to convey the soft mud only when the concentration of the dredging soft mud is high. When the water content of the soft mud exceeds a certain value, the open / close valve 64 is closed and the intake of the soft mud is stopped. The open / close cycle of the open / close valve 64 is determined in consideration of the soil properties of the dredging soft mud, the moving speed and the swing speed of the crawler 20a, and is, for example, about 5 seconds open and 4 seconds closed. In order to know the state of the soft mud in the dredging, it is desirable to provide a gamma ray densitometer in the discharge pipe 70 to calculate the water content from the density or to visually monitor the middle of the discharge pipe as a transparent pipe. .. The suction pump 42 is kept in continuous operation during business. The reason is that if the operation and the stop are repeated at a high frequency, the life of the motor for driving the pump is shortened. The check valve 6
Reference numeral 6 is for preventing backflow of compressed air. When the work in one place is completed, the dredger 10 is moved to the next work place, and the same work is continued.

As described above, in the present invention, while performing the same dredging as the conventional technique, the dredging of the soft mud having a high water content, which is a drawback of the conventional dredging of the pump, does not occur, but the high concentration of water with less entrainment is required. Achieved soft mud dredging.

[0012]

As described above, the present invention has the following excellent functions and effects. High-concentration soft mud with little accompanying water can be continuously transported in large quantities and stably to a distant destination. The water-proof hood has a strong shape and can be tilted to prevent water from entering, allowing only high-concentration soft mud to be taken in, and a stirrer inside the water-proof hood allows fluidization to some extent even for soft mud. And can be taken in smoothly. When the on-off valve is closed, the soft mud after the ejector has been pressure-fed by injecting compressed air.Even if the on-off valve is opened again to supply the soft mud, the new intake soft mud can be fed without hindrance and blockage in the pipe. It won't happen.

[Brief description of drawings]

FIG. 1 is an overall side view of a thin layer dredging and discharging device according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of a thin layer dredging and discharging device according to an embodiment of the present invention.

FIG. 3 is an enlarged front view of the main parts of the thin-layer dredging and discharging device according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating an opening / closing procedure of an opening / closing valve in the middle of a discharge pipe of a thin layer dredging / discharging device according to an embodiment of the present invention.

[Explanation of symbols]

 10 Dredging Ship 20 Lifting Device (20A Backhoe) 20a Crawler 20b Hydraulic Cylinder 40 Dredging Device 41 Body 41a Bracket 42 Suction Pump 42a Hydraulic Motor 44 Suction Pipe 46 Flexible Pipe 50 Water Stop Hood 50A Tilting Cylinder 52 Stirrer 52a Stirrer (54a Stirrer Hydraulic motor) 56 Bar screen 60 Discharge device 62 Discharge pipe 64 Open / close valve 66 Check valve 68 Ejector 70 Discharge pipe 100 Thin-layer dredging discharge device A Soft mud layer B Ground floor

Claims (5)

[Claims] 1. A thin-layer dredging and discharging device for dredging soft mud accumulated on the bottom of a harbor, lake, river, etc., which comprises a dredging device installed on a dredging ship and the dredging device mounted on the dredging ship. The lifting and lowering device is mounted on a crawler that can be moved laterally and that moves up and down the dredging device, and a discharge device that is connected to the dredging device and that conveys the dredged material by air. The dredging device includes a cylindrical suction pipe and A suction pump connected to the upper end of the suction pipe, a circular lid-shaped water stop hood tiltably arranged at the lower end of the suction pipe, and a tilting of the water stop hood mounted midway in the suction pipe. A hydraulic cylinder, and an agitator that is housed inside the water shut-off hood and has a plurality of agitating rods planted downward and can be swiveled around a vertical axis; and a swivel drive hydraulic motor for the agitating device. The discharging device is a discharge port of the suction pump of the dredging device. A thin-layer dredging and discharging device comprising a discharge pipe connected to the discharge pipe, an on-off valve provided in the middle of the discharge pipe, and an ejector of compressed air. 2. The thin layer dredging and discharging device according to claim 1, wherein the lifting device is formed by a backhoe. 3. The thin layer dredging / discharging device according to claim 1 or 2, wherein the water blocking hood is formed by bending in a reverse shape at the central portion. 4. The thin layer dredge according to claim 1, wherein the suction port of the suction pipe and the water blocking hood are connected by a flexible pipe, and the suction port is provided with a bar screen for preventing foreign matter from entering. Ejection device. 5. The thin layer dredging and discharging apparatus according to claim 1, wherein a gamma ray density meter or a transparent monitoring tube is provided in the middle of the discharging tube.