JP2613478B2 - Dredged material discharging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used to discharge sludge or ooze deposited on the sea floor or the like (hereinafter abbreviated as sludge) over a long distance by mixed-pressure feeding. The present invention relates to a dredged material discharging device.

[Conventional technology]

Conventionally, sludge dredged by a dredger has been once loaded on a barge bakkan (iron tank) provided in the dredger, transported by water, and landed on a shore by using a truck crane or the like.

However, in the system using the above-mentioned conventional dredged material discharging device, only the intermittent and inefficient conveyance was possible. In addition, when the sludge is fed into the barge bacchan or when the sludge is discharged from the barge bacchan, the sludge falls or scatters during transportation, contaminating the surrounding area.

Therefore, the applicant has, for example, as shown in Japanese Utility Model Application No. 1-40546, provided an inlet device for scraping ooze at the tip and provided a rigid screw conveyor capable of tilting in a horizontal state. We proposed a dredged material discharge device that immerses in a mud storage tank, raises mud with a rigid screw conveyor, pressurizes with a pressurizing pump, injects compressed air, and discharges.

[Problems to be solved by the invention]

However, in the above-mentioned dredged material discharge device, continuous operation is possible, but also, in the unlikely event that foreign matter is mixed in the rigid screw conveyor and clogged between the screw blade and the casing, power overload may occur. When an abnormal situation occurs, such as when the equipment is damaged, the operation can be stopped immediately, and the rigid screw conveyor can be repaired or repaired by leveling the rigid screw conveyor by the above-mentioned tilting means. It was impossible to avoid.

[Means for solving the problem]

In order to solve the above-mentioned problems and perform repair / repair without interrupting the operation, the dredged material discharging device of the present invention is provided with a vibrating screen for removing foreign matter and a vibrating screen below the vibrating screen. A mud storage tank disposed to store the soft mud after passing through the vibrating screen, a stirring paddle provided in at least one of the mud storage tanks, a horizontal screw conveyor provided on both lower sides of the mud storage tank, A slide gate provided at the entrance of the horizontal screw conveyor, a pressurized feeder connected to an outlet of the horizontal screw conveyor, and a compressed air injection nozzle provided in a discharge pipe after the pressurized feeder;
It consisted of.

[Action]

By configuring as described above, ooze such as sludge collected from the seabed or riverbed is supplied to the vibrating screen by a civil engineering machine such as a backhoe, and large foreign substances such as wood chips and rocks that cannot pass through the vibrating screen are removed. The sludge solidified from the soft mud that passed through the vibrating screen was disintegrated by the rotation of the stirring paddle laid in the mud storage tank, softened and increased in fluidity. Transferred to conveyor. Sliding gates are installed at the entrances of the horizontal screw conveyor.One of the sliding gates is closed and the other is open, so the soft screw is transported by the operation of the open horizontal screw conveyor. You.

After being transferred by the horizontal screw conveyor, the discharged soft mud is increased in pressure by a pressurized feeder, and compressed air is continuously injected from a nozzle provided in the middle of the discharge pipe, and is plug-transported through the discharge pipe, Discharged to a remote destination.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 show one embodiment of the present invention, FIG. 1 is a plan view of the apparatus of the present invention, FIG. 2 is a side view, and FIG.
FIG. 3 is a longitudinal sectional view as viewed in FIG. III-III.

In the figure, 1 is a hopper, 2 is a vibrating screen, 3 is a mud storage tank, 4 is a stirring paddle provided in an upper stage, 5 is a stirring paddle provided in a lower stage, 6 is a slide gate, 7 is a horizontal screw conveyor, and 8 is a pump. A pressure feeder, 9 is a check valve, 10 is a nozzle for injecting compressed air, 11 is a discharge pipe, and 12 is a discharge pipe after merging.

As shown in FIG. 1, the dredged material discharging device 300 includes a structure 100 including a hopper 1, a vibrating screen 2, a mud storage tank 3, and a horizontal screw conveyor 7, and a pressurized feeder 8, which is connected thereafter. It comprises a piping section 200 composed of a check valve 9, a nozzle 10, and discharge pipes 11 and 12.

As shown in FIGS. 2 and 3, the structure 100 includes a hopper 1 fixed by a support 1a erected from the mud storage tank 3 and a hopper 1 disposed below the hopper 1. A vibrating screen 2 swingably mounted on a support 2d erected on a side wall via a compression spring 2c, a mud storage tank 3 and a horizontal screw conveyor disposed below the mud storage tank 3; The vibrating screen 2 has two upper and lower meshes built in. The upper mesh has a size of 150 to 400 mm, and the lower mesh has a mesh of 50 to 150 mm. Foreign matter can be removed so as not to enter the mud storage tank.

Also, a plurality of upper and lower two-stage stirring paddles 4 and 5 are provided inside the mud storage tank 3 so as to be rotatable about a horizontal axis.
In addition, the upper and lower stirring paddles are disposed orthogonally.

Further, a horizontal screw conveyor 7 is disposed on each side of the lower side of the mud storage tank 3, and an electric motor 7b and a reduction gear 7a are provided.
And can be driven to rotate. Between the entrance of the horizontal screw conveyor 7 and the side wall of the mud storage tank 3, there is provided a slide gate 6 which can move forward and backward in the vertical direction so as to prevent the transfer of the soft mud to the horizontal screw conveyor 7, and a hydraulic cylinder 6a. Are linked.

On the other hand, as shown in FIG.
It is composed of ~ 12 and is designed to discharge ooze to a remote place of about 1km.

The operation of the dredged material discharging device of the present invention configured as described above will be described.

The soft mud such as sludge collected from the seabed or riverbed is thrown into the hopper 1 by a backhoe, a grab bucket, or the like. After the foreign matter is removed by the swing of the vibrating screen, the sludge enters the mud storage tank 3. In the mud storage tank 3, the solidified portion and lumps in the soft mud are disintegrated and decomposed by the rotational drive of the upper stirring paddle 4 and the lower stirring paddle 5, and the liquid soft mud rich in uniform fluidity as a whole is obtained. And transferred to the horizontal screw conveyor 7.

At this time, one slide gate 6 is in the fully closed state, and only the horizontal screw conveyor 7 corresponding to the other open slide gate 6 is operated. By adjusting the opening of the slide gate 6, the discharge capacity can be adjusted regardless of the volume of the contents in the storage tank 2.

During operation, when the foreign matter that cannot be removed by the vibrating screen 2 becomes clogged in the horizontal screw conveyor 7 and becomes overloaded, or when an abnormal state occurs and the horizontal screw conveyor 7 becomes inoperable, immediately The corresponding slide gate 6 is closed, the other slide gate 6 is opened, the operation is switched to the operation of the corresponding horizontal screw conveyor 7, and the failed horizontal screw conveyor 7 is operated.
Is disassembled and inspected and repaired, so there is no hindrance to the discharge of ooze. Moreover, the horizontal screw conveyor 7 has a storage tank 3
As described above, the soft mud transferred by the horizontal screw conveyor 7 is then exposed to the overpressure feeder 8 connected to the discharge port of the horizontal screw conveyor 7 as described above. While being pressurized, discharged through the check valve 9 to the discharge interval 11, and is continuously press-fitted from the nozzle 10, the compressed air of about 7 kg / cm ² forms a plug flow while forming a plug flow. The waste water is sent to a waste collection site or a landfill disposal site by a discharge pipe 12.

As the above-mentioned pressure feeder, a commercially available centrifugal pump, squeeze pump (tube pump), or the like can be used. The check valve 9 is provided to prevent the backflow of the soft mud due to the injection of compressed air.

The dredged material discharging device of the present invention can be used as a relay booster installed in a harbor or on land, or can be compactly installed in a dredger to transport ooze dredged at sea to the sea and to land. It can also be used for transportation. In addition, when the distance from the dredged material discharge device to the mud collection area is much longer than 1 km, it can be transported by arranging it at important points in the relay point and connecting the discharge pipes.

〔The invention's effect〕

Under the situation as described above, the horizontal screw conveyor breaks down while discharging the soft mud such as sludge to the mud collecting place by continuous operation using the dredged material discharging device,
Alternatively, when repair is required, the operation can be immediately switched to the operation of one of the horizontal screw conveyors, and the horizontal screw conveyor is exposed for easy inspection and repair, so that maintenance is excellent. Moreover, even if such an abnormal situation occurs, continuous operation is possible without interrupting the operation.

Therefore, the actual operation rate is improved, and the cost for repair or repair can be significantly reduced.

In addition, since the vibrating screen is provided with primary and secondary screens, troubles due to foreign matter are greatly reduced, and the possibility of realizing long-term continuous stable operation is increased.

[Brief description of the drawings]

1 to 3 show an embodiment of the apparatus according to the present invention. FIG. 1 is a plan view of the apparatus, FIG. 2 is a side view, and FIG.
FIG. 3 is a longitudinal sectional view as viewed in FIG. III-III. 1 ... hopper, 2 ... vibrating screen, 3 ... mud storage tank,
4 stir paddle (upper), 5 stir paddle (lower), 6 slide gate, 7 horizontal screw conveyor, 8 pressurized feeder, 9 check valve, 10 nozzle 11,12 …… Drain pipe, 100 …… Structure, 200 …… Piping part, 300 …… Dredge discharge equipment.

Claims (1)

(57) [Claims] A vibrating screen for removing foreign matter; a mud storage tank disposed below the vibrating screen for storing the soft mud after passing through the vibrating screen; and at least one or more provided in the mud storage tank. A stirring paddle, a horizontal screw conveyor provided on both sides of a lower part of the mud storage tank, a slide gate provided at an entrance of the horizontal screw conveyor, a pressurized feeder connected to an outlet of the horizontal screw conveyor, and the pressurized feeder And a nozzle for injecting compressed air provided in a subsequent discharge pipe.