JPH0749671B2 - Dredging mud lifting mud discharging device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dredging mud lifting mud discharging device, and more particularly to a dredging mud lifting mud discharging device adapted to discharge dredging mud at a high concentration.

[Conventional technology]

FIG. 2 shows a conventional dredging mud lifting mud discharging device, 1 is a work boat, 2 is a support column provided on the work boat 1, and 3 is this support column 2.
The rudder 4, whose upper part is rotatably supported, displaces the lower part of the rudder 3 in accordance with the dredging position. The rudder lifting winch provided on the work boat 1 is the rudder lifting winch 4 A wire rope connecting the lower portion of the ladder 3 is a roller rotatably provided at an appropriate portion of the ladder 3, for example, an upper portion, a lower portion and an intermediate portion, and 7 is endlessly suspended along the roller 6. A chain belt 8 is connected to the chain belt 7 continuously, for example, a large number of buckets 9 having drain holes at the bottom thereof, 9
Is a screw conveyor that receives and discharges the dredging mud from each bucket 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 discharge device, the chain belt 7 is moved so that the dredging mud drowned by the bucket 8 and containing a large amount of water is drained through a lower drainage hole provided in the bucket 8 while rudder. It reaches the upper part of 3 and discharges the dredged mud, and the discharged dredged mud is discharged by the screw conveyor 9.

[Problems to be Solved by the Invention]

In the conventional dredging mud discharge mud discharging device as described above, the water contained in the dredging mud is drained from the drain holes in the bucket 8 within the entire period of rising along the ladder 3, and is reduced to some extent. However, as shown in FIG. 2, more than half of the length of the ladder 3 is actually under the water surface, and the drainage function as described above does not work at all under the water surface.

As a result, the reclamation efficiency of the reclaimer is reduced, or spillway is required at the landfill site, which limits the environmental assessment.

The present invention solves such a problem.

[Means for Solving the Problems]

The dredging mud discharge mud discharge device of the present invention is a ladder that pivotally supports the upper part of the work boat in a tiltable manner, a dredging part provided in the lower part of the ladder, and the rudder of the ladder to displace the dredging part to the dredging position. In a dredging device consisting of an elevating means for elevating and lowering a lower part, a dredging mechanism for elevating a dredging mud holding container having a dewatering function from a dredging mud dredging position to a dredging mud discharging position, and this dredging mechanism with its lower part Airtightly enclosed, the upper end of which is fixed on the work boat and the lower part is connected to the lower part of the ladder, the bellows-like part inserted between the upper part and the lower part of the outer cylinder, and the outer cylinder. A mechanism for pressurizing air into the outer cylinder from above, a water level detection mechanism provided near the dredging position of the outer cylinder, and an output of the water level detection mechanism for controlling the air pressurization mechanism to control the inside of the outer cylinder. The water level of the A mechanism to be lowered below and interposed in the dredging mud outlet, characterized by being constituted by a rotary valve for blocking always airtight the discharge opening.

[Action]

In the dredging mud discharging device of the present invention, the drainage function is applied to the dredging mud over substantially the entire length of the ladder.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

According to the present invention, as shown in FIG. 1, a sludge mechanism portion including a ladder 3, a chain belt 7 and a bucket 8 is housed in an outer cylinder 12 having a lower end opening, and the upper end of the outer cylinder 12 is a work boat. The lower part of the outer cylinder 12 is connected to the lower part of the ladder 3 while being fixed on the upper part of the ladder 1.

Further, a bellows-like portion 13 is formed on the upper portion of the outer cylinder 12 to form an outer cylinder.
The lower part of 12 together with the rudder 3 is a winch 4 for raising and lowering the rudder.
Via the wire rope 5 the pivot point 14 of the ladder 3
When moved around, the bellows-like portion 13 is deformed and the outer cylinder 12
Allow the lower part of the to move relative to its upper part.

Further, a hopper 15 that opens onto the screw conveyor 9 is connected to the upper portion of the outer cylinder 12, and the hopper 15
The rotary valve 16 is inserted in the opening of the outer cylinder 12 to hermetically block the upper end portion of the outer cylinder 12 from the outside of the outer cylinder, and the air conditioning valve 17
Air is press-fitted into the outer cylinder 12 from above through the air introduction pipe 18 having a water level setting level sensor 19 near the dredging position of the outer cylinder 12, and the level sensor 19 The air-conditioning valve 17 is controlled to be opened / closed by an output signal so that the water level in the outer cylinder 12 becomes equal to or lower than the level sensor 19.

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

Since the dredging mud discharging device of the present invention has the above-described structure, when the dredging mud is lifted by the lifting mechanism, the air is supplied from the upper portion of the outer cylinder 12 to the outer cylinder 12 via the air introduction pipe 18. If the water level in the outer cylinder 12 is forcibly lowered to the level sensor 19 and the mud operation is performed in this state, there will be no water over most of the entire length of the ladder 3, During this period, the dredging mud in the bucket 8 is actively dehydrated.

Further, the water level in the outer cylinder 12 can be maintained substantially constant by the action of the level sensor 19 and the air conditioning valve 17, and the state of the sludge can be monitored by the sludge monitoring mechanism 20.
Can be monitored at all times.

〔The invention's effect〕

As described above, according to the dredging mud lifting mud discharging device of the present invention, dehydration from the dredging mud is sufficiently performed, the reclaimer landing efficiency is increased, and therefore it is not necessary to provide a spillway in the landfill, which is a great advantage There is.

[Brief description of drawings]

FIG. 1 is an explanatory view of a dredging mud lifting mud discharging device of the present invention, and FIG. 2 is an explanatory view of a conventional dredging mud lifting mud discharging device. 1 ... Work ship, 2 ... Posts, 3 ... Ladder, 4 ... Ladder winch, 5 ... Wire rope, 6 ... Roller, 7 ... Chain belt, 8 ... Bucket, 9 ...
… Screw conveyor, 10… Anchor wire, 11…
… Sea bottom, 12 …… Outer cylinder, 13 …… Velvet, 14 …… Pivot,
14 '... Chain drive unit, 15 ... Hopper, 16 ... Rotary valve, 17 ... Air conditioning valve, 18 ... Air introduction pipe,
19: Level sensor, 20: Lifting mud monitoring mechanism.

Claims (1)

[Claims] 1. A ladder for pivotally supporting an upper portion of a work boat in a tiltable manner, a dredging portion provided at a lower portion of the ladder, and lifting means for raising and lowering the lower portion of the ladder for displacing the dredging portion to a dredging position. In the dredging device consisting of, a dredging mud holding container having a dehydrating function to raise the dredging mud holding container from the dredging mud dredging position to the dredging mud discharging position, and this dredging mechanism is hermetically enclosed except for its lower part, An outer cylinder whose upper end is fixed on the work boat and whose lower part is connected to the lower part of the ladder, a bellows-like part inserted between the upper part and the lower part of this outer cylinder, and the inside of the outer cylinder from the upper part of the outer cylinder A mechanism for injecting air into the outer cylinder, a water level detection mechanism provided near the dredging position of the outer cylinder, and the output of this water level detection mechanism to control the air injection mechanism to detect the water level in the outer cylinder. Lower than the mechanism position A mechanism that was interposed in the dredging mud outlet, dredging mud Agedoro discharge apparatus characterized by being configured by the rotary valve for blocking always airtight the discharge opening.