JPH0561413B2 - - Google Patents

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 inhalers using the vortex pump method or the pneumatic pump method.

However, in either method, the accumulated mud is absorbed directly into the water, or it is disturbed.
The fluidity of mud is increased and it is sucked in by a pump, and the sucked mud flows into the suction port along the flow of muddy water, so if muddy water has fluidity close to that of water, for example, the water content ratio is 200. % or more, apart from
In most cases, water channels form quickly in muddy soil, leading to water flow, following the principle that what flows easily enters 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. Very difficult.

[Purpose of the invention]

The present invention solves the above-mentioned conventional problems, places the upper part of the cutter wheel in the air, excavates the mud at the bottom of the water, drains the mud, and continuously dredges the mud in a highly concentrated state. It is intended to.

[Structure of the invention]

The present invention provides a plurality of buckets having input ports at the bottom on the cutter wheel, and a mud storage tank with an opening at the top to input the mud from the water bottom excavated by the buckets inside the cutter wheel. Install a stirring blade in the mud storage tank, cover the upper part of the cutter wheel with an airtight hood, expose the supply port that continuously supplies pressurized air into the airtight hood, and The dredging system consists of a high-concentration dredging device equipped with a pump that pumps mud through a pipeline to a treatment plant.

〔Example〕

Embodiments of the present invention will be described 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, and FIG. 2 is a partially sectional front view of FIG. 1. , Figure 3 is a plan view of Figure 1, Figure 4 is a plan view of Figure 1.
Side view of a dredger equipped with high concentration dredging equipment,
FIG. 5 is a plan view of FIG. 4.

First, this high-concentration dredging equipment is
As shown in the figure, the swing wire 15 is connected to the hull 17 of the dredger and the rudder 16, and is operated by a spout winch 21, and the swing wire 15 is operated by the swing winch 22 of the rudder 16 with the spat 14 fixed to the seabed as the swing fulcrum. As a result, this high-concentration dredging device performs dredging while swinging from side to side.

Next, this high-concentration dredging device is provided with a cutter wheel 1 constituting an excavation part that rotates while holding a number of buckets 2 for excavating mud on the water bottom on its outer periphery. An input port 13 is provided at the bottom for introducing excavated mud into an opening 23 provided above a mud storage tank 3 provided in the cutter wheel 1 so as not to rotate.

In addition, an input port 1 is provided at the base of the bucket 2 at the top of the mud storage tank 3 which is in a fixed state.
An opening 23 is provided through which the mud from 3 falls into the mud storage tank 3, and a cutter wheel shaft 4 driven by a cutter wheel shaft drive source 5 is inserted through the mud storage tank 3. The cutter wheel shaft 4 is provided with a stirring blade 6 that increases the fluidity of the mud while stirring the mud stored in the mud storage tank 3.

Furthermore, as described above, the cutter wheel 1 with the built-in mud storage tank 3 is covered almost in its upper half with an airtight hood 10, and the air supply port 11 is connected to the hull 1.
Pressurized air is continuously supplied from an air compressor 18 on 7, and the pressurized air is prevented from dissipating by an airtight hood 10. By discharging more than a certain amount of air from the air outlet 12, the part of the cutter wheel 1 exposed from the water and the mud storage tank 3 are kept in an air atmosphere, and as a result, the cutter wheel 1 is kept in an air atmosphere when excavating mud. Wheel 1 and mud storage tank 3
It is possible to prevent surrounding water from flowing into the interior.

Next, the mud in this mud storage tank 3 is transferred to the mud suction port 7.
The slurry is taken out from the tank, suctioned and pressurized by mud suction pressurizing ailerons 9, sent to three pneumatic type main pumps 8, and passed from above the hull 17 via a mud discharge pipeline 19 (not shown). It is now being pumped to a processing plant.

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. The mud is continuously excavated and sampled, and the mud is agitated in the air atmosphere inside the airtight hood 10. In addition to the pressure difference depending on the water depth, the mud is sucked and pressurized by the auxiliary vanes 9, which causes the mud to flow into the main pump 8. At the same time, the mud inside the bucket is actively discharged by the force of pressurized air, and is also discharged toward the mud suction port.

Therefore, during dredging, the main pump 8 and the bucket 2 are moved left and right by pulling the swing wire 15 with the spout 14 as the center, and the dredging work is carried out by moving the bucket 2 to the left and right. However, when the bucket 2 rotates and enters the airtight hood 10, the water in the bucket 2 flows from the inlet 13 to the mud storage tank 3.
It enters the gap between the cutter wheel 1 and the cutter wheel 1, returns to the water, and only the mud remains in the bucket 2. Since there is an air atmosphere inside the upper bucket 2, water existing in the surrounding area does not mix with the mud. , it is possible to excavate only muddy soil at the bottom of the water.

The mud taken into the mud storage tank 3 in this way is disturbed by the stirring blades 6, and the fluidity of the mud increases.The mud with increased fluidity is pushed by the air pressure inside the mud storage tank 3, and absorbs mud. Passing through the mouth 7, the mud suction pressurizing aileron 9
The mud is pressurized and flows into the main pump 8.

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 accumulated soil 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 that it is possible to dredge continuously at a high concentration.

In addition, 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, so the water depth is shallow and the main pump Even if the pressure difference necessary for mud to flow into the main pump 8 is insufficient, the mud suction pressurizing ailerons 9 help the mud flow into the main pump 8.

Furthermore, when dredging mud in deep water, the airtight hood can be filled with only air by increasing the pressure of the pressurized air sent into the airtight hood. In other words, it is sufficient to send air at a pressure commensurate with the depth of the water.

〔Effect of the invention〕

A: An atmospheric atmosphere is created underwater, and when the mud enters the atmospheric atmosphere, it is first drained and then passed through the atmospheric atmosphere before being put into the mud storage tank. Substantially only mud can be collected without mixing mud.

B The air pressure in the air atmosphere acts directly on the mud surface in the mud storage tank, and as a result, the excavated mud can be pressurized and removed in a highly concentrated state, and it can be dredged continuously, making it highly efficient. Can be dredged.

C The power of pressurized air can actively discharge the mud in the bucket, and the power can also actively discharge the mud toward the mud suction port.

D When the bucket containing mud and water reaches the top and enters the airtight hood, the water in the bucket leaks from the inlet and returns to the water, leaving only the mud in the bucket and filling the mud storage tank. It can be discharged from the opening and enables high-density dredging.

E Since only earth and sand are pumped by air, even if air enters the suction port, there is no problem with pump operation.

F: Disturber blades are installed inside the mud storage tank, making mud discharge easier even when the water content is low.

[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...Katsuta 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 with input ports at the bottom are installed on the cutter wheel, and a mud storage tank with an opening at the top is attached to the inside of the cutter wheel to input the mud from the water bottom excavated by the bucket. A stirring blade is installed in the mud storage tank, the upper part of the cutter wheel is covered with an airtight hood, and the airtight hood faces a supply port that continuously supplies pressurized air, and the mud in the mud storage tank is A high-concentration dredging device equipped with a pump that pumps the water to the treatment plant via a pipeline.