JPH02240331A - Device for dredging and discharging mud - Google Patents

Abstract

PURPOSE:To promote the efficiency of pumping up mud by providing a pumping up mud mechanism lifting a dredging mud holding container having a deterring mechanism up to a discharging position, an external cylinder to be air-tightly enveloped other than the lower end of the pumping up mud mechanism and a mechanism lowering the water level by making force-fit of air into the external cylinder. CONSTITUTION:A pumping up mud mechanism is constituted of a ladder 3, a chain belt 7 and a bucket 8 to house them into an external cylinder 12 having an opening of the lower end thereof, and the upper part thereof connected to an operation ship 1 and the lower part is connected to the lower part of the ladder 3. When the upper part and the lower part of the external cylinder 12 forming a cornice shape section 13 are moved, the bellows shape section 13 is transformed to make it possible to move up and down relatively. The outside space between the upper end section of the external cylinder 12 and the external cylinder is air-tightly cut off to make force-fit of air into the external cylinder 12 by means of an air introduction pipe 18 form above, and opening and shutting of an air conditioning valve 17 is controlled by a water level setting level sensor 19 provided to a specific lower part of the external cylinder 12. According to the constitution, dewatering can be sufficiently made, and the efficiency of pumping up mud can be promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dredged mud lifting and discharging device, and particularly to a dredging mud lifting and discharging device that discharges dredged mud at a high concentration.

[Conventional technology]

Figure 2 shows a conventional dredging mud pumping and discharging device, in which 1 is a work boat, 2 is a support provided on the work boat 1, 3 is a ladder whose upper portion is rotatably supported on this support 2, and 4 In order to displace the lower part of this ladder 3 according to the dredging position, the work boat 1
A winch for raising and lowering the ladder provided above; 5 is a wire lobe that connects the winch 4 for raising and lowering the ladder with the lower part of the ladder 3; 6 is a suitable part of the ladder 3, for example, the upper part;
7 is a chain belt suspended endlessly along the roller 6, and 8 is a plurality of rollers continuously connected to the chain belt 7, each having a drainage hole in its lower part. 9 is a screw conveyor for receiving and discharging dredged mud from each packet 8 at the upper part of the ladder 3, 10 is an anchor wire of a work boat, 11 is the seabed to be dredged, and 14' is a chain drive unit.

In such a conventional dredging mud lifting and discharging device, by moving the chain belt 7, the dredged mud containing a large amount of water dredged by the packet 8 is drained through the lower drainage hole provided in the packet 8 and is then drained to the ladder. 3, the dredged mud is discharged here, and this drained dredged mud is discharged by the screw conveyor 9.

[Problem to be solved by the invention]

In the conventional dredged mud lifting and discharging device as described above, the water contained in the dredged mud is drained from its drainage holes in the packet 8 during the entire period of ascending along the ladder 3, and is reduced to such an extent that However, as shown in FIG. 2, more than half of the length of the rudder 3 is under the water surface, and the above-mentioned drainage function does not function at all under the water surface.

As a result, problems such as the reflamer's soil pumping efficiency decreases or the need for a spillway at the landfill site arise, and there are also restrictions from the perspective of environmental assessment.

The present invention solves these problems.

[Means to solve the problem]

The dredged mud lifting and discharging device of the present invention includes a mud lifting mechanism for raising a dredged mud holding container having a dewatering function from a dredging mud dredging position to a dredged mud discharging position, and a dredging mud lifting mechanism except for its lower end. It is characterized by comprising an outer cylinder that is airtightly surrounded and a mechanism that pressurizes air into the outer cylinder from the upper part of the outer cylinder to lower the water level inside the outer cylinder.

[For production]

In the dredged mud lifting and discharging device of the present invention, a drainage function is applied to the dredged mud over substantially the entire length of the rudder.

〔Example〕

The present invention will be explained in detail below with reference to the drawings.

In the present invention, as shown in FIG. 1, the mud lifting mechanism consisting of the ladder 3, chain belt 7, and bucket saws 1 to 8 is housed in an outer cylinder 12 with an opening at the lower end, and the upper end of this outer cylinder 12 is It is fixed on the work boat 1, and the lower part of the outer cylinder 12 is connected to the lower part of the ladder 3.

A bellows-like part 13 is formed in the upper part of the outer cylinder 12, and the lower part of the outer cylinder 12 is moved together with the rudder 3 by the rudder lifting winch 4 via the wire lobe 5 around the pivot point 14 of the rudder 3. When the bellows-like portion 13 is bent, the bellows-like portion 13 is deformed so that the lower portion of the outer tube 12 can move relative to its upper portion.

Further, a hopper 15 that opens onto the screw conveyor 9 is connected to the upper part of the outer cylinder 12, and a rotary valve 6 is inserted into the opening of the hopper 15 to connect the upper end part of the outer cylinder 12 and the outer cylinder. At the same time, air is forced into the outer cylinder 12 from the upper part thereof through an air introduction vibrator 18 having an air conditioning valve 17, and a level sensor 19 for setting the water level is provided at a predetermined lower part of the outer cylinder 12. is provided, and the air conditioning valve F is controlled to open and close based on the output signal of this level sensor 19.

If necessary, a slurry monitoring mechanism 20 such as a television is provided in the middle portion of the outer cylinder 12.

Since the dredged mud lifting and discharging device of the present invention has the above-described configuration, when lifting dredged mud with the mud lifting mechanism, air is introduced from the upper part of the outer cylinder 12 through the air introduction by 118. The level sensor 1 is press-fitted into the outer cylinder 12 and measures the water level inside the outer cylinder 12.
If the dredged mud in the packet 8 is forcibly lowered to the 9th part and the mud lifting work is carried out in this state, most of the entire length of the ladder 3 will be free of water, and during this time the dredged mud in the packet 8 will be actively dewatered. will be carried out.

The water level inside the outer cylinder 12 is measured by a level sensor 19 and an air conditioning valve 17.
Due to the action of the above, it is possible to maintain the slurry at a substantially constant level, and the state of the slurry lifting can also be constantly monitored by the slurry pumping monitoring mechanism 20.

〔Effect of the invention〕

As described above, according to the dredged mud lifting and discharging device of the present invention, water is sufficiently removed from the dredged mud, the reflamer soil lifting efficiency is increased, and therefore there are great benefits such as no need to provide a spillway at the landfill site. be.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a dredged mud lifting and discharging device of the present invention, and FIG. 2 is an explanatory diagram of a conventional dredging mud lifting and discharging device. 1... Work boat, 2... Strut, 3... Ladder 4...
Winch for lifting ladder, 5...Wire robe, 6.
... Roller, 7... Chain belt, 8... Packet, 9... Screw conveyor, 10... Anchor wire 11... Seabed, 12... Outer cylinder, 13...
... Bellows-shaped part, 14... Pivotal point, 14'... Chain drive part, 15... Hopper 16... Rotary valve, 7... Air conditioning valve, 18... Air introduction vibrator, 19...Level sensor, 20...Sludge monitoring mechanism.

Claims (1)

[Claims] (1) A mud lifting mechanism for raising a dredged mud holding container having a dewatering function from a dredging mud dredging position to a dredged mud discharge position, and an outer cylinder that airtightly surrounds this mud lifting mechanism except for its lower end; A dredging mud lifting and discharging device comprising a mechanism configured to pressurize air into the outer cylinder from the upper part of the outer cylinder to lower the water level inside the outer cylinder.