JPS63134721A - Dredging apparatus of high density - Google Patents

Abstract

PURPOSE:To continuously execute dredging work in the state of high density, by covering the upper section of a cutter wheel with a fitted sludge-storage-tank into which sludge excavated by a bucket is cast, with an air-tight hood, and by setting a pump for pressure-feeding sludge to its treatment site. CONSTITUTION:At the bottom section of the fitting section of a cutter wheel 1, a casting port 13 for casting sludge into a sludge storage tank 3 is set, and the upper section of the sludge storage tank 3 is provided with an opening section 23 for dropping the sludge through the casting port 13, and a cutter shaft 4 is provided with stirring blades 6, respectively, and the upper section of the wheel 1 is covered with an air-tight hood 10. Water is prevented from blowing into the wheel 1 and the sludge storage tank 3 due to pressure-applying air, and fluidity is applied to the sludge stirred by the stirring blades 6, and through a sludge-absorbing port 7, the sludge is pressure-energized by an absorbed-sludge-pressure-applying auxiliary blade 9, and is permitted to flow into a main pump 8. The sludge in the main pump 8 is pressure-fed to its treatment site via a pipe-line 19 by the pressure-applying air through a pressure- applying air feeding port 20, and is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a high-concentration dredging device that continuously dredges mud deposited on the bottom of a water body at a high concentration and pumps it to a treatment plant.

[Prior art]

In order to continuously dredge the mud deposited on the bottom of the water at a high concentration, it is desirable to prevent water from entering as much as possible and absorb the mud in its deposited state. Various mud suction devices are available depending on the purpose. Examples of this can be seen in inhalation devices using a vortex pump method or a pneumatic pump method.

However, in either method, the accumulated mud is sucked up underwater as it is, or it is disturbed to increase the fluidity of the mud and then sucked in with a pump. Because it flows into the mouth, if the muddy water has a fluidity similar to that of water, for example, if the water content is over 200%, in most cases, water will quickly form a path in the muddy soil, causing water to get mixed in. This is in line with the principle that things that flow easily go in first.

As can be expected from this phenomenon, when using any suction device to suck up mud using the flow of mud, continuous and highly concentrated dredging is difficult due to the principle that what flows easily flows first. It is difficult to describe non-literally.

[Purpose of the invention]

The present invention solves the above-mentioned conventional problems, and aims to excavate mud at the bottom of the water using a bucket wheel installed in an air atmosphere, and continuously dredge the excavated mud in a highly concentrated state. This is what I did.

[Structure of the invention]

In the present invention, a plurality of buckets each having an input port at the bottom are provided on the cutter wheel, and a mud storage tank with an opening at the top is installed inside the cutter wheel to input the mud from the water bottom excavated by the buckets. , consists of a high concentration dredging device that covers the upper part of the cutter wheel with an airtight hood and is equipped with a pump that pumps the mud in the mud storage tank to the treatment plant via a pipeline.

〔Example〕

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a side sectional view of a high concentration dredging device in an embodiment of the present invention, FIG. 2 is a partially sectional front view of FIG. 1, 3 is a plan view of FIG. 1, FIG. 4 is a side view of a dredger equipped with the high concentration dredging device shown in FIG. 1, and FIG. 5 is a plan view of FIG. 4.

First, this high concentration dredging device is connected by a dredger hull 17 and a rudder 16 as shown in FIGS. 4 and 5, and is operated by a spud winch 21, which swings a spud 14 fixed to the seabed. rudder 16
Swing wire 1 by swing winch 22
By the operation 5, this high concentration dredging device performs dredging while being swung from side to side.

Next, this high-concentration dredging device is equipped with a cutter wheel 1 that rotates while holding a number of buckets 2 for excavating mud on the water bottom on its outer periphery, and a cutter wheel 1 that rotates while holding a number of buckets 2 for excavating mud on the water bottom is installed at the bottom of the attachment side of the buckets 2 to the cutter wheel 1. An input port 13 is provided through which mud can be input into a mud storage tank 3 provided inside the cutter wheel 1.

Further, an opening 23 is provided at the top of the mud storage tank 3 to allow the mud from the input port 13 to fall into the mud storage tank 3, and a cutter wheel shaft driving source 5 is provided inside the mud storage tank 3. A cutter wheel shaft 4 is installed through the cutter shaft 4, and the cutter shaft 4 is provided with a disturbance blade 6 that disturbs the mud stored in the mud storage tank 3 and increases its fluidity. .

Further, as described above, the cutter wheel 1 having a built-in mud storage tank 3 has its upper half covered with an airtight hood 10, and is connected to an air compressor 18 on the hull 17 from an air supply port 11.
By supplying pressurized air from the tank and discharging a certain amount or more of air from the air outlet 12, the portion of the cutter wheel 1 exposed underwater and the mud storage tank 3 are maintained in an atmospheric atmosphere. As a result, when excavating mud, surrounding water can be prevented from flowing into the cutter wheel 1 and the mud storage tank 3.

Next, the mud in the mud storage tank 3 is taken out from the mud suction lower, sucked and pressurized by the mud suction pressurizing auxiliary vanes 9, and sent to three pneumatic main pumps 8 to drain the mud. It is designed to be sent under pressure from the top of the ship's hull 17 to a treatment plant (not shown) via a delivery pipeline 19.

Note that a pressurized air supply port 20 is provided at the top of the main pump 8 to open the inside of the main pump 8 to the atmosphere and to supply air to be pressurized and pumped with mud.

This high-concentration dredging device with the above-mentioned configuration is equipped with elements that enable continuous high-concentration dredging by excavating muddy soil at the bottom of the water. Continuously excavate the mud using the airtight hood 1.
In addition to the pressure difference depending on the water depth, the mud suction pressurizing ailerons 9 help the mud flow into the main pump 8, and the mud is removed using pressurized air. There is.

Therefore, during dredging, the main pump 8 and bucket 2 are moved left and right by pulling the swing wire 15 with the spud 14 as the center, and the dredging work is carried out by moving the bucket 2 to the left and right. However, since the inside of the bucket 2 is in an air atmosphere, only the mud at the bottom of the water can be excavated without surrounding water mixing with the mud.

The mud taken into the mud storage tank 3 in this way is disturbed by the stirring blades 6, and the mud increases its fluidity.The mud with increased fluidity is pushed by the air pressure inside the mud storage tank 3, and absorbs mud. The main pump 8
The mud flows into the

The mud in the main pump 8 is drained and dredged by pressurized air from the pressurized air supply port 20 through the pipeline 19.

In this way, since the sediment is excavated and taken into the main pump 8 to be drained, the chances of water getting mixed in can be kept extremely low, so dredging can be carried out continuously at a high concentration.

The high concentration dredging device of this embodiment is provided with mud suction pressurizing auxiliary vanes 9 that absorb and pressurize the mud in the mud storage tank 3 and feed it into the main pump 8. pump 8
Even if the pressure difference necessary for the mud to flow into the main pump 8 is insufficient, the mud suction pressurization assist H9 helps the mud flow into the main pump 8.

〔Effect of the invention〕

In the high-concentration dredging device of the present invention described above, sedimentary soil is collected by mechanical excavation, so it is possible to collect mud reliably, and it also creates an atmospheric atmosphere underwater and stores the excavated mud. Since the mud is poured into the tank, the mud can be collected without mixing with surrounding water, and the air pressure in the air atmosphere acts directly on the mud surface in the mud storage tank. It has the effect of being able to dredge continuously in a highly concentrated state, making it possible to perform highly efficient dredging.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a high concentration dredging device according to an embodiment of the present invention, Fig. 2 is a partially sectional front view of Fig. 1, Fig. 3 is a plan view of Fig. 1, and Fig. 4 is a FIG. 1 is a side view of a dredger equipped with a high concentration dredging device, and FIG. 5 is a plan view of FIG. 4. 1...Cutter wheel, 2...Bucket, 3...
Sludge storage tank, 6... Disturber blade, 8... Main pump, 10
...Airtight hood, 11...Air supply port, 12...
Air outlet, 19...pipeline.

Claims (1)

[Claims] 1. A plurality of buckets each having an input port at the bottom are provided on the cutter wheel, and an opening is provided at the upper part of the cutter wheel so that mud from the water bottom excavated by the buckets can be input into the cutter wheel. This is a high-concentration dredging device that is equipped with a mud storage tank, covers the upper part of the cutter wheel with an airtight hood, and is equipped with a pump that pumps the mud in the mud storage tank to a treatment plant via a pipeline. 2. Claim 1 in which a disturbance blade is provided in the mud storage tank
High-concentration dredging equipment as described in section. 3. The high concentration dredging device according to claim 1 or 2, wherein the airtight hood is provided with an air supply port.