JPH1030251A - Sea bottom deposit suction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the work efficiency by notching a peripheral wall of an opening in a lower end of a vertical cylindrical body of which upper part is connected with a suction pump locally to provide a difference in steps and forming a plurality of suction ports on the cylindrical peripheral wall in the upper part thereof. SOLUTION: A vertical cylindrical body 4 connected with a suction pump 8 and a support frame 11 which suspends it and sweeps a sea bottom 1 constitute a sea bottom deposit absorption device. Next, at the time of sweeping, a lower fringe of a stepped section S bites a deposit layer 2, and a violent stream generated in a clearance between an upper side of the stepped section S and a surface of the layer 2 collapses the layer 2. Then, deposit which is scraped up and soft deposit in a surface layer part of the layer 2 are suctioned by a pump 8 into a cylinder 4 through a plurality of suction ports 6 formed in an opening at a lower end of the cylinder 4 and on a peripheral wall above it and are stored in a tank 9 for disposal. A cover like a bamboo hat which covers the suction ports 6 guides a stream containing deposit into the suction ports 6 to prevent the pollution of sea water due to the diffusion of the deposit. Consequently, it is possible to execute the work continuously without causing clogging.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for sucking and removing sediment such as sludge on the sea floor.

[0002]

2. Description of the Related Art Conventionally, when sucking and removing sludge on the seabed in a harbor or the like, the main work means has been to intermittently scoop up with a grab. There is a problem that the appropriate suction action cannot be performed due to the occurrence of such a phenomenon or the contamination of the seawater in the vicinity.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention is efficient in that the shape of the opening for sucking the sediment such as sludge on the seabed and the arrangement of the suction port are improved, and the surrounding seawater is not polluted. It is an object to provide a seabed sediment suction device as described above.

[0004]

In order to solve the above-mentioned problems, a submarine sediment suction device according to the present invention comprises a vertical tubular body connected to a suction pump at an upper portion and swept along the seabed. The peripheral wall of the lower end opening of the cylindrical body is locally notched to have a stepped shape, and the peripheral wall of the cylindrical body slightly above the lower end opening has a plurality of suction ports spaced apart in the circumferential direction. Is formed, and a cap-shaped cover in which an inner peripheral portion of an upper opening is fixed to an outer peripheral surface of a peripheral wall of the cylindrical body above the suction port is provided so as to guide a flow sucked into the suction port. It is characterized by having been done.

[0005] In the above seabed sediment suction apparatus of the present invention,
Since the lower end opening of the vertical cylindrical body connected to the suction pump has a stepped shape in which the peripheral wall is partially notched, the above-mentioned stepped portion is formed during the sweeping operation along the seabed of the cylindrical body. While the lower edge of the lower end opening of the shape bites into the sedimentary layer on the sea floor, a gap is maintained between the upper side of the notch step on the peripheral wall of the opening and the surface of the sedimentary layer, and the pump suction The force causes a violent flow through the gap so that the deposited layer is properly sucked into the opening so as to collapse.

On the other hand, the lowermost edge of the lower end opening of the tubular body that has penetrated the deposited layer acts to agitate the collapsed deposited layer as described above when the tubular body advances along with the sweeping operation of the tubular body. The sediment such as sludge scraped up in this manner passes through the cylindrical body through a plurality of suction ports formed in a lower end opening of the cylindrical body and a peripheral wall slightly above the opening. It will be sucked into the inside. In addition, the suction port originally has a function of sucking soft deposits on the surface layer of the deposition layer.

At the time of the above-described suction operation, the cap-shaped cover covering the plurality of suction ports guides the flow including the deposits to the suction ports, so that the soft deposits and the collapse The presence of the cap-shaped cover sufficiently prevents seawater contamination due to the diffusion of the sediment that has been scraped up.

Further, in the seabed sediment suction device of the present invention, the circumferential wall of the lower end opening of the cylindrical body is notched so as to leave a semicylindrical rear portion in the sweep direction of the cylindrical body. It is characterized by having a step shape.

When the rear side of the circumferential wall forming the lower end opening of the cylindrical body is left in a semi-cylindrical shape, this portion scoops up sediment on the seabed like a scoop. Is performed, the action of sucking the deposit into the cylindrical body with the operation of the pump is smoothly performed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a seabed sediment suction device as an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a main part thereof in a cutaway manner, and FIG.
It is sectional drawing in the -A arrow direction.

As shown in FIG. 1, the seabed sediment suction device of the present embodiment is connected to a land-based suction pump 8 via a hose 7 in order to suck and remove the sedimentary layer 2 such as a sludge on the seabed 1. The vertical cylindrical body 4 is swept along the seabed 1 via a suspension means such as a support frame 11 or a wire.

The circumferential wall 10 at the opening at the lower end of the cylindrical body 4
Is locally notched to have a stepped shape S. In the present embodiment, the rear side in the sweep direction is cut out so as to remain in a semi-cylindrical shape as shown in FIGS. In addition, as a mode of the notch having the stepped shape S, three peripheral walls may be left at 60-degree intervals, or two peripheral walls may be left at 90-degree intervals.

The cylindrical body 4 has four suction ports 6 formed on the peripheral wall slightly above the peripheral wall of the lower end opening at intervals in the circumferential direction. The inner peripheral surface of the upper opening of the cap-shaped cover 5 is fixed to the outer peripheral surface of the peripheral wall of the cylindrical body 4, and the cover 5 is arranged to guide the flow sucked into the suction port 6.

In this embodiment, the suction pump 8 is installed on land, and the seabed sediment sucked by the pump 8 is stored in the tank 9 on land. May be mounted on a dredger.

In the above-described submarine sediment suction apparatus according to the present embodiment, the lower end opening of the vertical cylindrical body 4 connected to the suction pump 8 has a stepped shape S in which the peripheral wall 10 is locally notched. Therefore, during the sweeping operation of the cylindrical body 4 along the sea floor, the lower edge of the lower end opening of the step shape bites into the sedimentary layer 2 on the sea floor, and the upper edge of the notch on the peripheral wall of the opening. A gap is maintained between the gap and the surface of the deposited layer 2, and a violent flow through the gap is generated by the suction force of the pump 8, whereby the deposited layer 2 is broken. It is accurately sucked into the opening.

On the other hand, the lowermost edge of the lower end opening of the tubular body 4 that has penetrated the deposited layer 2 is displaced as described above when the tubular body 4 is advanced along with the sweeping operation of the tubular body 4. The sediment such as sludge that has been scraped up in this manner is passed through a plurality of suction ports 6 formed in the lower end opening of the cylindrical body 4 and the peripheral wall slightly above the opening. It is sucked into the inside of the tubular body 4. Also,
The suction port 6 originally has a function of sucking soft deposits on the surface layer of the deposition layer.

At the time of the above-described suction operation, the cap-shaped cover 5 covering the plurality of suction ports 6 guides the flow containing the deposits to the suction ports 6, so that the soft deposits and Seawater pollution due to the diffusion of the sediment that has been broken and raked up is sufficiently prevented by the presence of the cover 5.

In the present embodiment, the rear side of the circumferential wall 10 forming the lower end opening of the cylindrical body 4 is left in a semi-cylindrical shape as shown in FIG. Thus, the operation of scooping up the sediment on the seabed is performed, and the operation of sucking the sediment into the cylindrical body 4 with the operation of the pump 8 is smoothly performed. The seabed sediment sucked and discharged by the pump 8 in this manner is temporarily stored in the tank 9 and then disposed of as appropriate.

In the seabed sediment suction apparatus of this embodiment, the lower end opening having the stepped shape S of the vertical cylindrical body 4 breaks down the layer having high viscosity of the seabed sediment and sucks it. Since the mouth 6 mainly sucks the soft layer having low viscosity, the sea bottom sediment can be continuously suctioned and removed without clogging. Note that reference numeral 3 in FIG.
Indicates a flow flowing into the lower end opening having the stepped shape S and a flow flowing into the suction port 6.

[0020]

As described above in detail, the following effects can be obtained according to the marine sediment suction apparatus of the present invention. (1) Since the lower end opening of the vertical cylindrical body connected to the suction pump has a stepped shape in which the peripheral wall is partially notched, during a sweeping operation along the seabed of the cylindrical body. While the lowermost edge of the lower end opening of the step shape bites into the sedimentary layer on the sea floor, a gap is maintained between the upper side of the notch step of the peripheral wall of the opening and the surface of the sedimentary layer, A violent flow through the gap is generated by the suction force of the pump, so that the deposited layer is properly sucked into the opening so as to be broken. (2) The lowermost edge of the lower end opening of the tubular body that has penetrated the deposited layer performs an action of stirring the deposited layer when the tubular body advances along with the sweeping operation of the tubular body. Deposits such as sludge raised are sucked into the cylindrical body through a plurality of suction ports formed in a lower end opening of the cylindrical body and a peripheral wall slightly above the opening. Become. (3) Since the cap-shaped cover covering the plurality of suction ports guides the flow including the sediment to the suction port, the soft sediment or the spread of the sediment that has been broken up and scraped up. Seawater pollution is sufficiently prevented by the presence of the cap-shaped cover. (4) The lower end opening of the vertical cylindrical body having the stepped shape breaks down the layer with high viscosity of the seabed sediment and sucks it, and the plurality of suction ports above it mainly sucks the weak layer with low viscosity, The seabed sediment can be continuously suctioned and removed without clogging. (5) If the rear side of the circumferential wall forming the lower end opening of the cylindrical body is left in a semi-cylindrical shape, since this portion performs an action of scooping up sediment on the seabed like a scoop, With the operation of the pump, the action of sucking the deposit into the cylindrical body is smoothly performed.

[Brief description of the drawings]

FIG. 1 is a side view showing a seabed sediment suction device as one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3

[Explanation of symbols]

 Reference Signs List 1 seabed 2 sedimentary layer 3 flow 4 vertical cylindrical body 5 cap-shaped cover 6 suction port 7 hose 8 suction pump 9 tank 10 peripheral wall 11 support frame S stepped shape

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[Procedure amendment]

[Submission date] August 28, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Figure 3

[Correction method] Deleted

Claims (2)

[Claims] An upper part is connected to a suction pump and a vertical cylindrical body which is swept along the seabed is provided. A peripheral wall of a lower end opening of the cylindrical body is locally notched to have a stepped shape. A plurality of suction ports are formed at intervals in the circumferential direction on the peripheral wall of the cylindrical body slightly above the lower end opening, and an upper opening is formed on the outer peripheral surface of the peripheral wall of the cylindrical body above the suction port. A sea bottom sediment suction device, characterized in that a cap-shaped cover to which the inner peripheral portion is fixed is disposed so as to guide the flow sucked into the suction port. 2. The seabed sediment suction device according to claim 1, wherein a circumferential wall of a lower end opening of the cylindrical body leaves a rear side portion of the cylindrical body in a sweep direction in a semi-cylindrical shape. A seabed sediment suction device having a notched stepped shape.