JPS615126A - Dredging equipment - Google Patents

Abstract

PURPOSE:To lessen the bulkiness of sludge soil as well as avoid the muddling of the surrounding water area by providing a shield case to prevent the diffusion of sludge in dredging place and along the carrying-out path of the sludge through which sludge is delivered. CONSTITUTION:Compressed air is supplied by a pump 2 to front of a dredger 1 to form a pressurized chamber 3 where sludge is to be accumulated. Cylindrical shield cases 6 having openings on their tip portions are continuously connected through connectors 5 of a bellows form to the front ends of the chamber 3. A bucket conveyer 9 is provided in the cases 6. The sludge of the bottom under water is scooped up by the bucket 9 and orderly carried into the cases 6. The diffusion of sludge to the surrounding water area can thus be prevented, and the efficiencies of dredging and reclamating work can be greatly enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dredging device, and particularly to a dredging device that continuously dredges the bottom of a seabed or the like to prevent water from being polluted by the dredging in the surrounding water area. This invention relates to a device that prevents muddy soil from absorbing water and increasing its swelling ratio.

2. Description of the Related Art The bottoms of oceans, lakes, rivers, dams, etc. are dredged to purify these bodies of water, or the dredged mud is used for land reclamation.

When carrying out such dredging, pump boats and grab boats are used, but since pump boats suck up the mud from the bottom of the water along with the surrounding water, they are less likely to pollute the surrounding waters. However, the dredged mud is mixed with the water that was sucked up at the same time, and the mud of the original structure contains a lot of water and has a high swell rate, so when it is put into the reclaimed area, the mud particles are easily removed. In order for this settled mud to return to its original structure with less water, it will take a long time to drain the water, and it is also necessary to solve the problem of waste water disposal at the landfill, so it is necessary to carry out dam construction work. It could slow down the progress. Also,
A grab boat digs up mud from the bottom of the water with its claws on both sides, picks it up, moves it through the water, and carries it out onto the water, so when moving through the water, it is unavoidable that the mud spreads into the surrounding waters. , This not only causes pollution of water bodies, but also when the dredged mud is dug up and IJ!
! When it is disposed of, it absorbs water and swells, which can delay the formation of a landfill, similar to the above.

Continuous dredging methods include bucket dredging and auger dredging, but bucket dredging uses a so-called bucket conveyor, in which a large number of buckets are attached to an endlessly rotating conveyor, to scoop up mud from the bottom of the water one after another and bring it above the water. Since dredging is carried out sequentially, dredging work can be carried out continuously and work efficiency is good, but it is impossible to avoid dispersion of the dredged mud into the water during removal of mud, and the mud piled up in the bucket is continuous. As they move through the water, their diffusion into the water increases, increasing the degree of pollution of surrounding water bodies. Moreover, the mud absorbs water while moving underwater and swells, causing the same problems as above. Auger dredging uses a drill-like tip to excavate mud and send it out into the water one by one using a spiral blade installed along the shaft, so when the mud moves underwater, it cannot avoid polluting the surrounding water area. Not only that, but muddy soil cannot be avoided, resulting in the same problems as above.

In both cases of individual dredging and continuous dredging, contamination of the surrounding water area is unavoidable, so the dredging area is surrounded by a submerged embankment fence, which isolates the construction area from the outside world and prevents contamination of the outside water area. Such measures are being taken. However, it is not preferable to install submerged embankment fences in each construction area in this way because it requires materials and takes time to install. Furthermore, effective measures have not yet been taken to prolong the period of reclamation work due to the large swell rate of the dredged mud.

Problems to be Solved by the Invention As described above, the present invention solves the problem that the conventional dredging equipment cannot avoid contamination of the dredged area, and even if the dredged mud is used for reclamation, the swell rate is large. This was done in order to solve the problem that the formation speed of reclaimed ground is slow.

Means for Solving the Problems In order to solve the above problems, the present invention provides a dredging device for dredging the bottom of a water area and transporting the dredged mud. ! The present invention provides a dredging device characterized in that a shielding case is provided along at least a mud discharge route among the discharge routes to prevent the mud from dispersing.

In addition, the present invention provides a dredging device for dredging the bottom of a water area and transporting the dredged mud, as a device that exhibits a remarkable effect in solving the above-mentioned problems. A dredging device characterized by providing a shielding case for preventing the dispersion of mud along at least one of the transporting routes for mud, and a pressurizing means for lowering the water level generated within the shielding case. It provides:

Function: As mentioned above, if a shielding case is provided at the dredging site and at least the transport route of the transported mud, the transported mud that moves through most of the water depth of the water area where pollution is to be prevented will be contained within the shielding case. Since it can prevent diffusion into the surrounding water, it can reduce the pollution of the surrounding water area, but this alone will stir up the water inside the shielding case, so if pressurized air is sent into the shielding case to lower the water level, Since the transported mud moves in pressurized air and is transported without contact with water, the mud does not swell, and the amount of water at the dredging location is reduced, making it easier to stir the mud during dredging. It is possible to better prevent mud from spreading to the surrounding area.

Example Next, embodiments of the present invention will be described based on the drawings.

Reference numeral 1 designates a dredger, and in front of the dredger 1 there is formed a pressurized chamber 3 to which pressurized air is supplied by a pump 2 and where mud is accumulated, and this pressurized chamber 3 is equipped with a screw 3a for discharging the accumulated mud. is provided. A discharge port 3b communicating with the discharge chamber 4 is provided at the rear end of the pressurizing chamber 3, and the opening area of the discharge port 3b can be adjusted by an opening adjustment plate 4a. In addition, a cylindrical shielding case 6 with an open tip is provided at the front end of the pressurizing chamber 3 via a bellows-shaped connecting part 5.
The shielding case 6 is suspended at its tip by a wire 8 by a crane 7 attached to the pressurizing chamber 3, and can be moved vertically and horizontally by the operation of the crane 7. ing. -The above shielding case 6
A packet conveyor 9 is provided inside, and this packet conveyor 9 is attached to the inner wall of the shielding case 6 and is driven by a motor (not shown).

Next, the operation of this embodiment will be explained.

First, the dredger 1 is parked at the dredging site with the tip opening of the shielding case 6 exposed from the water surface, and the opening adjustment plate 4a is operated to close the discharge port 3b. In this state, while operating the pump 2 to send pressurized air into the pressurizing chamber 3, the tip of the shielding case 6 is lowered into the water by operating the crane 7 and placed as shown in the figure. The illustrated example is shielding case 6.
There is a small gap between the water and the bottom of the water. In this state, the supply air pressure is adjusted to adjust the water level in the shielding case 6 as shown in the figure.

When the packet conveyor 9 is driven in this state, the buckets contact the bottom of the water one after another and scoop up the mud, and the scooped up mud is sequentially IM-transmitted inside the shielding case 6, but when each packet scoops up the mud, the amount of water around it is Because the amount of mud is small, it is difficult for the turbidity to spread to other water bodies, and since the amount of water that is scooped up can be reduced, the swell rate can be reduced, so the structure of the original mud can be maintained almost as it is and the shielding case can be used. 6.

Since the mud transported inside the shielding case 6 is transported in pressurized air, the structure of the dredged mud is maintained as it is. This mud is then sequentially discharged to the bottom of the pressurizing chamber 3.

” - If the work described above continues and the amount of mud accumulated in the pressurizing chamber 3 becomes large, operating the opening adjustment plate 4a to open the discharge port 3b will release the water contained in the mud. is pushed out by pressurized air and discharged into the discharge chamber.

Although dredging continues in this manner, by moving the shielding case 6 in the horizontal direction, dredging can be performed at a different location. When the amount of mud stored in the pressurized chamber 3 reaches its limit, the water accumulated in the discharge chamber 4 is discharged overboard,
The mud in the pressurized chamber 3 is removed from the discharge chamber 4 by operating the screw 3a.
to be discharged.

In this manner, when the discharge chamber 4 is filled with mud, the dredger may be moved to the reclamation area and the mud may be dropped by opening the bottom of the ship, for example. At this time, the muddy soil does not have a large swelling ratio in its dredged state, and water is drained by pressurized air in the pressurizing chamber 3, so the muddy structure is dense, and the reclaimed ground is formed. The speed can be increased.

In the above example, a gap is provided between the shielding case 6 and the water bottom, but if this gap is not provided and the tip of the shielding case is brought into close contact with the bottom of the water, pollution of the surrounding water area can be more reliably prevented.
This is desirable because the structure of the dredged mud can also be maintained as it was.

In addition, although the water level inside the shielding case was lowered using pressurized air in the above example, it is possible to prevent the surrounding water from becoming contaminated even if the water level inside the shielding case is kept the same as the water level in the outside world without using this pressurized air. At the same time, since the amount of water in the shielding case is small, the swell rate of the transported soil can also be kept from becoming so large.

Further, although a packet conveyor is used in the above example, an auger may also be used.

Further, the packet conveyor and auger provided as described above may be provided at an angle or may be provided vertically.

Effects of the Invention According to the present invention, since a shielding case is provided around at least the dredged mud transport route among the dredged area and the dredged mud transport route, most of the depth of the water during which the mud is transported is transported to the water surrounding the mud. can prevent the spread of water and prevent pollution of surrounding water bodies. Also, if a shielding case is installed at the dredged area, it will be possible to thoroughly prevent contamination. Not only this, but since the amount of water that the dredged mud comes into contact with can be reduced, its swell rate can also be reduced, and when it is used as land for reclamation, the speed at which the ground forms can be increased and the construction period can be shortened. In this way, pollution of water bodies can be prevented, mud can be used for landfill, and continuous dredging can be performed, so the efficiency of dredging and landfill work can be significantly improved.

Further, according to the second aspect of the present invention, pressurized air is blown into the shielding case, thereby lowering the water level inside the shielding case, so that the agitation of the dredged mud is better prevented than in the above case. In addition to more reliably preventing pollution of the surrounding water area, the swell rate of the dredged mud can be further reduced, and its structure can be made denser, making it possible to further speed up the formation of the reclaimed ground. Furthermore, the efficiency of continuous dredging work can be further improved, and the efficiency of dredging work and reclamation work can be significantly improved.

[Brief explanation of the drawing]

The figure is an explanatory diagram of an apparatus according to an embodiment of the present invention. In the figure, 1 is a dredger, 2 is a pump, 3 is a pressurizing chamber, 3a is a screw, 3b is a discharge port, 4 is a discharge chamber, 4a is an opening adjustment plate, 5 is a connection part, 6 is a shielding case, 7 is a crane, 8
is a wire, and 9 is a conveyor. June 20, 1982

Claims (2)

[Claims] (1) In a dredging device that dredges the bottom of a water body and carries out the dredged mud, a shield is provided to prevent the mud from dispersing at least along the dredged area and along the mud carrying route. A dredging device characterized by being equipped with a case. (2) In a dredging device that dredges the bottom of a body of water and transports the dredged mud, a shield is provided to prevent the mud from dispersing at least along the dredging location and the mud transport route. 1. A dredging device comprising a case and a pressurizing means for lowering the water level generated within the shielding case.