JPH0363323A - Dredged substance discharging device - Google Patents

Abstract

PURPOSE:To perform repair and mending without suspending operation during the occurrence of abnormality by a method wherein horizontal screw conveyors are respectively mounted on both sides of the lower side of a sludge storage tank, and slide gates are arranged facing the respective screw coveyors. CONSTITUTION:Sampled sludge is charged in a hopper 1, through swing of a vibration screen 2, a foreign matter is removed and guided to a sludge storage tank 3, and crushed and decomposed by means of agitating paddles 4 and 5 crossing at right angles with each other. The one slide gate 6 is closed, and through operation of only the horizontal screw conveyor 7 responding to the other gate 6 in an opening state, and sludge is pressurized by means of a pressure feeder 8. The sludge is discharged through discharge pipes 11 and 12 to a destination by means of compressed air pressed in through a nozzle 10. When the conveyor 7 is brought into an inoperable state, the corresponding gate 6 is closed, the other gate 6 is opened, and operation of the conveyor 7 is switched to repair the conveyor 7 brought into failure in operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for discharging sludge, soft mud, etc. (hereinafter abbreviated as sludge) deposited on the seabed, etc. over long distances by mixed pumping. This relates to a dredged material discharge device.

[Conventional technology]

Traditionally, sludge dredged by a dredger is loaded into a purge baracan (iron tank) installed on the dredger, and then
They were transported by water and unloaded on the quay using truck cranes.

However, in the method using the conventional dredged material discharging device described above, the dredged material could only be transported intermittently and inefficiently.

Furthermore, when the sludge is delivered to the purge balkan or discharged from the purge balan, the sludge falls or scatters during transportation, contaminating the surrounding area.

Therefore, as shown in Utility Application No. 1-40546, the present applicant developed a vertical screw conveyor equipped with an inlet device at the tip for scraping up soft mud and capable of tilting in a horizontal state. We proposed a dredged material discharge device that immerses the mud in a mud storage tank, lifts it with a vertical screw conveyor, pressurizes it with a pressure pump, injects compressed air, and discharges it.

[Problem to be solved by the invention]

However, although continuous operation is possible with the above-mentioned dredged material discharging device, there is also the possibility that foreign matter should get into the vertical screw conveyor and get stuck between the screw blades and the casing, resulting in a power overload. In the event of an abnormal situation that may result in damage to the equipment, the vertical screw conveyor can be repaired or repaired by immediately stopping the operation and leveling the vertical screw conveyor using the above-mentioned tilting means. It was impossible to avoid it.

[Means to solve the problem]

By solving the above-mentioned problems and without interrupting operations,
In order to enable repairs and maintenance, the dredged material discharge device of the present invention includes a vibrating screen for removing foreign matter, and a mud storage device disposed below the vibrating screen to store soft mud after passing through the vibrating screen. a tank, at least one stirring paddle provided in the mud storage tank, a horizontal screw conveyor provided on both sides of the bottom of the mud storage tank, a slide gate provided at the entrance of the horizontal screw conveyor, and a horizontal screw conveyor provided at the bottom of the mud storage tank on both sides; It consisted of a pressure feeder connected to the discharge port of the conveyor, and a nozzle for injecting compressed air provided in the discharge pipe after the pressure feeder.

[Effect]

With the above configuration, soft mud such as sludge collected from the seabed or river bottom is supplied to the vibrating screen using civil engineering equipment such as a backhoe, and large foreign objects such as wood chips and rocks that cannot pass through the vibrating screen are removed. The solidified sludge out of the soft mud that has passed through the vibrating screen is crushed by the rotating action of the stirring paddles installed in the mud storage tank, becoming soft and fluid, and then passed through the horizontal type sludge located on both sides of the bottom of the mud storage tank. It is transferred to the screw conveyor. A slide gate is attached to each side of the horizontal screw conveyor, and one slide gate is closed and the other is open, so the soft sludge is transferred by operating the open horizontal screw conveyor. be done.

After being transferred by a horizontal screw conveyor, the discharged soft mud is pressurized by a pressurized feeder, compressed air is continuously injected from a nozzle installed in the middle of the discharge pipe, and the slurry is transported through the discharge pipe as a plug. It is shipped to a remote destination.

〔Example〕

Hereinafter, details of embodiments of the present invention will be described based on the drawings.

Figures 1 to 3 show one embodiment of the present invention, where Figure 1 is a plan view of the device of the present invention, Figure 2 is a side view, and Figure 3 is a longitudinal cross-section taken from Figure 2 - ■. It is a diagram.

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

As shown in FIG. 1, the dredged material discharging device 300 includes a structure 100 consisting of a hopper 1, a vibrating screen 2, a mud storage tank 3, and a horizontal screw conveyor 7, and a pressurized feeder 8 connected to the structure 100 thereafter. Check valve 9, nozzle 10, discharge pipe 11
, 12.

As shown in FIGS. 2 and 3, the structure 100 includes a hopper 1 fixed by a sabot 1a erected from the mud storage tank 3, and a mud storage tank 3 disposed below the hopper 1. A vibrating screen 2 is swingably attached via a compression spring 2c to a support 2d erected on the side wall of the tank, a mud storage tank 3, and a horizontal screw installed at the lower side of the mud storage tank 3. It consists of a conveyor 7, and the vibrating screen 2 has two built-in meshes, upper and lower.
mm, and the lower mesh is 50 to 150 mm, each of which is designed to remove foreign substances such as wood and rocks contained in the soft mud so that they do not enter the mud storage tank.

Further, inside the mud storage tank 3, a plurality of stirring paddles 4 and 5 in two stages, upper and lower, are provided so as to be rotatable about the horizontal axis.
In addition, the upper and lower stirring paddles are arranged to be orthogonal to each other.

Furthermore, horizontal screw conveyors 7 are disposed on both sides of the lower part of the mud storage tank 3, and are equipped with an electric motor 7b and a speed reducer 7.
It can be rotated via a. A slide gate 6 that can move forward and backward in the vertical direction is provided between the entrance of the horizontal screw conveyor 7 and the side wall of the mud storage tank 3 to prevent the transfer of soft mud to the horizontal screw conveyor 7.
It is connected to the hydraulic cylinder 6a.

On the other hand, as shown in FIG.
It consists of 12 to 300 meters, and is designed to transport soft mud to a remote location approximately 1 km away.

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

Soft mud such as sludge collected from the seabed or river bottom is introduced into the hopper 1 using a backhoe, grab bucket, etc., and after foreign matter is removed by the vibration of a vibrating screen, it enters the mud storage tank 3. In the mud storage tank 3, the solidified parts and lumps in the soft mud are crushed and decomposed by the rotation of the upper stirring paddle 4 and the lower stirring paddle 5, and the whole becomes liquid soft mud with high uniformity and fluidity. and is transferred to the horizontal screw conveyor 7.

At this time, one slide gate 6 is in a fully closed state, and only the horizontal screw conveyor 7 corresponding to the other slide gate 6 in an open state is rotated. Note that by adjusting the opening degree of the slide gate 6, the discharge capacity can be adjusted regardless of the volume of the contents in the mud storage tank 2.

During operation, if foreign matter that cannot be removed by the vibrating screen 2 clogs the horizontal screw conveyor 7 and causes an overload, or if some abnormal condition occurs and the horizontal screw conveyor 7 becomes inoperable, immediately Close the corresponding slide gate 6, open the other slide gate 6, switch to the operation of the corresponding horizontal screw conveyor 7, and remove the failed horizontal screw conveyor 7.
Since the equipment will be disassembled, inspected, and repaired, there will be no problem at all with soft mud discharge. Moreover, since the horizontal screw conveyor 7 is exposed to the lower outside of the mud storage tank 3, it can be easily inspected and repaired.

As described above, the soft mud transferred by the horizontal screw conveyor 7 is then pressurized by the pressurizing feeder 8 connected to the discharge port of the horizontal screw conveyor 7, and is sent to the discharge pipe via the check valve 9. 11 and continuously pressurized through the nozzle 10 to form a plug flow with approximately 7 kg/rm 2 compressed air, the discharge pipe 12 directs the air to the destination mud collection site or landfill disposal site. sent to.

As the above-mentioned pressurized feeder, a commercially available centrifugal pump, squeeze pump (tube pump), etc. can be used. In addition,
The check valve 9 is provided to prevent soft mud from flowing back due to compressed air injection.

The dredged material discharging device of the present invention can be used as a relay booster installed in a port or on land, or can be installed compactly in a dredger to transport soft mud dredged at sea to land. It can also be used for transportation. In addition, if the distance from the dredged material discharge device to the sludge collection area is far greater than 1 km, transportation is possible by placing the dredged material at important points in the relay area and connecting the discharge pipes.

〔Effect of the invention〕

Under the above circumstances, the horizontal screw conveyor breaks down or requires repair while the dredged material discharging device is continuously discharging sludge and other soft mud to the collecting area. If this occurs, operation can be immediately switched to one of the horizontal screw conveyors, and since the horizontal screw conveyor is exposed for easy inspection and repair, it is superior in terms of maintenance. Furthermore, even if such an abnormal situation occurs, continuous operation is possible without interrupting operation.

Therefore, the actual operating rate is improved, and repair or repair costs can be significantly reduced.

In addition, since the vibrating screen is provided with a primary and secondary screen, troubles such as foreign matter contamination are drastically reduced, and the possibility of realizing long-term continuous stable operation is increased.

[Brief explanation of drawings]

1 to 3 show one embodiment of the device according to the present invention, FIG. 1 is a plan view of the device, FIG. 2 is a side view, and FIG. 3 is a second embodiment of the device.
FIG. 1... Hopper, 2... Vibrating screen, 3... Sludge storage tank, 4... Stirring paddle (upper stage), 5... Stirring paddle (lower stage) 6... Slide gate, 7...・Horizontal screw conveyor, 8... Pressure feeder, 9... Check valve, 10... Nozzle, 11.12... Discharge pipe, 100
... Structure, 200 ... Piping part, 300 ... Dredged material discharge device.

Claims (1)

[Claims] (1) A vibrating screen for removing foreign matter, a mud storage tank disposed below the vibrating screen to store the soft mud that has passed through the vibrating screen, and at least one stirring paddle provided in the mud storage tank. A horizontal screw conveyor provided on both sides of the lower part of the mud storage tank; A slide gate provided at the entrance of the horizontal screw conveyor; A pressure feeder connected to the discharge port of the horizontal screw conveyor; A dredged material discharge device consisting of a nozzle for injecting compressed air installed in a discharge pipe;