JP2000355953A - Pump dredging equipment and pump dredging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent environmental problems and damage on the water industry by providing a waste water receiver and a waste water discharge opening in the vicinity of a waste water conduit and soil intake. SOLUTION: A mixture of water and soil is sucked from an intake 4 and the mixture is sucked up above water through a conduit and then, the mixture is classified into soil and water by a dewatering device 5 eqtzipped on a boat or the like and thereafter, water is recovered in a waste water receiver 1 and jetted out from a waste water discharge outlet 3 installed in the vicinity of a soil intake through a waste water conduit 2. Most of turbid water 7 led to the waste water discharge outlet 3 is sucked as the mixture from the intake 4 together with soil and separated from the soil above water and repeatedly discharged as waste water and circulated. And hence, the volume of turbid water discharged to the surroundings and the quantity of fine particles of soil suspending in water can be reduced. Therefore, it is possible to extremely lessen the environmental problems and generation of turbid water imparting damage to the water industry.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pump dredging apparatus and a pump dredging method used in seas, marshes, lakes, rivers, and the like.

[0002]

2. Description of the Related Art In a conventional pump dredging apparatus, a mixture of earth and sand and water is sucked from an inlet, the mixture is sucked up on water through a conduit, and the mixture is dewatered by a dehydrating apparatus mounted on the water, for example, on a ship. Was separated into sediment and water, and the water was discharged as wastewater.

However, in conventional pump dredging equipment, it is important to suck up a mixture of soil and water with high efficiency, and the separation of small-sized earth and sand using an advanced dewatering apparatus lowers the efficiency of the dredging operation. It was not considered much because it caused the cost and increased costs, and in some cases it was not equipped with a dewatering device.

For this reason, the conventional pump dredging device discharges a very large amount of polluted water as wastewater to the surroundings, causing serious environmental problems and damage to the fishing industry, etc. The cost of compensation for damages to industries is enormous.

[0005]

The problem to be solved by the present invention is that the conventional pump dredging apparatus and the pump dredging method discharge an extremely large amount of polluted water as wastewater to the surroundings, which causes environmental problems and the fishing industry. That is to try to prevent damage to others.

[0006]

Means for Solving the Problems A drainage pipe, a drainage pipe connecting the drainage receptacle and the drainage outlet, and a pump dredging apparatus having a drainage outlet near the earth and sand intake port, and a pump dredging method using the same.

[0007]

FIG. 1 is a view showing one embodiment of a pump dredging apparatus according to the present invention.
Is a drain pipe connecting the drain receiver and the drain outlet, and 3 is a drain outlet provided near the sediment suction port.

2 and 3 are views of a conventional pump dredging device. A mixture of earth and sand and water is sucked from an inlet, the mixture is sucked up on water through a conduit, and installed on water, for example, on a ship. The mixture is separated into a sediment portion and a water portion by the dewatering device, and the water portion is discharged as waste water.

At this time, since the dewatering device provided in the conventional pump dredging device cannot highly separate the mixture into the sediment portion and the water portion, fine sediment particles are discharged to the periphery together with the drainage. However, since fine sediment particles have a low sedimentation speed, they stay in the water for a long time, and the pollution expands.
It will cause serious environmental problems and damage to the fishing industry.

In the pump dredging device according to the present invention, a mixture of earth and sand and water is sucked from an inlet, the mixture is sucked up on water via a conduit, and the mixture is removed from the water by a dehydrating device mounted on a ship, for example, on a ship. After separating the sediment and water parts, the wastewater is collected by a drainage catcher, and the wastewater is guided to a drainage outlet provided near the sediment suction port by a drainage pipe. Although the water is spouted from the discharge port, it is also possible to obtain a mixture of water and earth and sand efficiently by providing a pump in a part of the pipeline to increase the force of the spout. Further, when the type of the pump for sucking the mixture of the earth and sand and the water is a jet pump, there is an advantage that the drainage can be used as the pressure water of the pump.

By properly arranging the relationship between the discharge port and the suction port, most of the turbid water guided to the discharge port is sucked from the suction port as a mixture with earth and sand,
Since the water circulates repeatedly while being separated from earth and sand to become drainage, the amount of turbid water released to the surroundings can be reduced, and the amount of fine earth and sand particles floating in the water can be extremely reduced.

Since the amount of wastewater is smaller than the amount of the mixture of water and earth and sand, the turbid water can be efficiently sucked by directing the discharge outlet to the inlet and slightly in front of the inlet. Even if the turbid water from the discharge outlet is not sufficiently sucked from the inlet, the turbid water is guided near the water bottom, so that fine sediment particles do not float widely from near the water surface to the water bottom.

[0013]

FIG. 1 shows an example of a pump dredging device of a self-propelled ship. However, the present invention can also be applied to a pump dredging device and a dredging method of a type combined with a carrier ship, and a pump dredging device and a dredging method on land. It can also be applied to a dredging device or a dredging method equipped with a cutter near the suction port.

[0014]

By employing the pump dredging apparatus of the present invention and the dredging method using the pump dredging apparatus of the present invention, generation of muddy water due to dredging work which causes environmental problems and damages to the fishing industry, etc. is extremely reduced. It became possible to reduce it.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the structure of a pump dredging device of the present invention.

FIG. 2 is an explanatory view showing the structure of a conventional pump dredging device.

FIG. 3 is a cross-sectional view showing the structure of a conventional pump dredging device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drainage receiver 2 Drainage pipe 3 Drainage discharge port 4 Inlet port 5 Dehydration device 6 Drainage 7 Polluted water 8 Water bottom 9 Water surface

Claims (2)

[Claims] 1. A pump dredging device having a drain receiver, a drain pipe connecting the drain receiver and the drain outlet, and a drain outlet in the vicinity of the sediment inlet. 2. A dredging method using a pump dredging device, comprising: a drain receiver, a drain pipe connecting the drain receiver and the drain outlet, and a drain outlet in the vicinity of the sediment inlet.