JPH07268900A - Dredging equipment - Google Patents

Abstract

PURPOSE:To mount a dredging equipment on a dredger, and to not only dredge and pump up mud on the sea bottom with high efficiency in high concentration but also operate the dredger simply and easily without stretching the dredger by a swing wire. CONSTITUTION:A dredging equipment 100 is installed to a dredger and fixed onto a lifting-lowering frame body 20A capable of being lifted and lowered by a winch, and formed from a delivery pipe 70 with a vertical type screw conveyor 40, a pressure pump 50 and an air nozzle 60 and a plurality of pairs of drum cutters 30 fastened onto the lifting-lowering frame body 20A and disposed on both sides of the lower end section of the vertical type screw conveyor 40 bilaterally symmetrically. A plurality of cutters 33 protrude from the outer circumference of a drum 32 turned around a horizontal shaft in the drum cutter 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable, for example, to seabeds, lakes,
The present invention relates to a dredging device used when dredging soft mud and sand mud such as sludge accumulated at the intakes of rivers, harbors and power plants.

[0002]

2. Description of the Related Art As a conventional dredging device, there is a pump type. In this pump type dredging device, a large-capacity pump is installed on a barge or the like, and a hose is extended from the pump to the bottom of the water such as the seabed or the bottom of the lake to suck up the soft mud with water. Then, the soft mud dredged in this way is mainly transported to the landfill by a pipeline. At the landfill site, after the mud is settled, the residual water is treated with a coagulant and then discharged.

[0003]

However, in the above-mentioned conventional dredging apparatus, the amount of water sucked up simultaneously with the soft mud is too large and a large-capacity disposal site is required, and the spillage treatment requires a large amount of money. There was a drawback that it required. In addition, in the case of pump dredging, it is necessary to stretch at least two swing wires diagonally to the seabed from the dredger in order to keep the dredger at a fixed position in the ocean during dredging.Unlike wide ocean, dredging in rivers and dams is required. In some cases, the swing width could not be sufficiently secured, which hindered efficient dredging. In addition, in an area where ships frequently travel, such as in a harbor, there is a problem that the stretched swing wires hinder the navigation of other ships.

[0004]

In order to solve these problems, the dredging device of the present invention is a dredging device which is mounted on a dredging ship and which is suspended by an elevating frame which is vertically movable by a winch hoist. The dredging device is fixed to the vertical screw conveyor, a discharge pump having an air nozzle for injecting compressed air, a pressure pump connected to the discharge port of the vertical screw conveyor, and fixed to the elevating frame. The vertical screw conveyor is formed of a plurality of sets of drum cutters symmetrically arranged on both sides of the lower end portion of the vertical screw conveyor, and the drum cutters are arranged at substantially equal intervals on the outer periphery of a drum which is driven to rotate about a horizontal axis. A cutter is provided so as to project. Further, in the second invention, the axial distance between the pair of both drum cutters is increased as the height of the drum cutters is increased, so that the drum cutter row on one side is inclined.

[0005]

According to the dredging device of the present invention, the drum cutters symmetrically arranged on both sides of the lower end of the vertical screw conveyor are brought into contact with the seabed and driven to rotate, and the cutter is detached from the mud and the entire dredging device is placed in the mud. The mud that has been buried in, excavated and fluidized is sequentially taken in from the intake at the lower end of the vertical screw conveyor and transported vertically. In this way, the mud discharged from the discharge port above the vertical screw conveyor is sent to the pressure pump and pressurized, and compressed air is injected into the discharge pipe to transport it to the destination remote from the dredger. To be done.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 relate to an embodiment of the present invention, FIG. 1 is an overall schematic side view of a dredging device, FIG. 2 is a side view of a main part of the dredging device, and FIGS. 3 to 5 are other embodiments of the present invention. FIG. 3 is a side view of a main part of the dredging device, and FIG. 4 is AA of FIG.
6 is a side view of FIG. 6, FIG. 5 is a sectional plan view of FIG.
FIG. 3 is an overall vertical cross-sectional view of a vertical screw conveyor. As shown in FIG. 2, the dredging device 100 has pulleys 20b on the upper surfaces of both ends.
A vertical screw conveyor 40 vertically suspended and fixed in the center of a horizontal elevating frame body 20A made of a shape steel to which is attached
And the pressurizing pump 50 and the discharge pipe 70 which are its accessories
And an air nozzle 60 for injecting compressed air provided in the middle thereof and a plurality of sets of left and right symmetrical drum cutters 30 supported by the elevating frame body 20A. The dredging device 100 configured as described above is suspended by the elevating frame body 20A and moves up and down by elevating the wire ropes 20a wound around the pulleys 20b at both ends of the elevating frame body 20A. That is, as shown in FIG. 1, the wire rope 20a is installed on the top of the tower 10 which is erected on the deck of the dredger 90.
It goes back and forth through the winch hoisting machine 20 while passing through a and 10a.

As shown in FIG. 6, the vertical screw conveyor 40 includes bearings 44 and 4 in a vertical cylindrical casing 41.
A spiral screw 4 is attached to a rotary shaft 42 that is pivotally supported by
3, the screw 43 is rotationally driven together with the rotary shaft 42 by a hydraulic motor 46, and the soft mud and the like taken in from the lower end is discharged from an upper discharge port 47. As shown in FIG. 2, a discharge pipe 70 including a pressurizing pump 50 that is rotationally driven by a hydraulic motor 46 and an air nozzle 60 that injects compressed air is connected downstream of the discharge port 47. Is composed of a flexible pipe, and is connected from the dredger 90 to a remote destination. A plurality of pairs of left and right drum cutters 30, 30 and the like are symmetrically arranged on both sides of the lower end of the vertical screw conveyor 40, and fixed by supports 22 protruding from the elevating frame body 20A.

The drum cutter 30, as shown in FIG.
All four are equipped with plate-shaped cutters 33 having sharp tips at substantially equal intervals on the outer periphery of a drum 32 that rotates around a horizontal rotation shaft 31 in parallel with the rotation shaft 31 in a removable manner. The bearing 31a that supports both ends of the rotary shaft 31 is the support 2 described above.
It is fixed to 2. In the rotation direction of the drum 32, the lower right one in FIG. 2 is clockwise, the upper right one is counterclockwise, and the left half is in the opposite direction. Therefore, the lower drum 32
The mud excavated by the cutter 33 is lifted up as it is and is taken as it is from the intake port at the lower end of the vertical screw conveyor 40. Further, the outer mud is excavated in the upper drum 32, inverted as it is and sent obliquely downward, reaches the lowermost drum 32, and is taken into the vertical screw conveyor 40 by the above-described procedure. The drums 32 are rotationally driven by hydraulic motors (not shown) provided independently of each other. The rotation speed of the drum 32 is 10 to 20 rpm
Adjust the level according to the hardness of the mud (generally lower for hard mud).

On the other hand, what is shown in FIGS. 3 to 5 is another embodiment of the present invention, and the difference from the embodiment of FIG. 2 will be described. The drum 32 of the drum cutter 30 has a rotating shaft 31 and a bearing 31a. Front and rear supports 22, which are supported via
There is a main body drum 32a sandwiched between 22 and a projecting drum 32b formed by a bowl-shaped portion covering a portion projecting outward from the support 22, and the cutter 33 is not a plate-shaped one but a rod-shaped projection. The drums 32 are arranged on the outer surface of the drum 32 in a grid pattern or in a zigzag pattern.
As shown in FIG. 3, the drum 32 is driven to rotate so that the upper drum 32 and the lower drum 32 are the same through a chain 34a and a pair of sprockets 34b, 34b by a hydraulic motor 34 fixed to the elevating frame 20A. Drive in the direction of rotation. In the present embodiment, the number of the hydraulic motors 34 required in the embodiment shown in FIG. 2 is four, whereas the number of the hydraulic motors 34 is four.
There is an advantage that the excavation range is wide because there is the overhanging drum 32b having the same number 1.

The operation of the dredging device 100 of the present invention constructed as above will be described. Dredge device 10 of the present invention
The dredger 90 equipped with 0 is circulated to the dredging site, and after stopping, the winch hoisting machine 20 is operated to gently drop the lifting frame 20A horizontally into the sea. After the drum cutter 30 on the lower end side has landed on the seabed, the drum 32 is rotationally driven. The mud on the seabed is excavated by the rotation drive of the drum 32, and the drum cutter 30 gradually sinks into the mud layer, and eventually all the drum cutters 30 are buried in the mud layer, and the upper-layer drum cutter 30 excavates and
The fluidized mud moves downward, and the lower drum cutter 3
At 0, it is further sent to the intake port of the vertical screw conveyor 40 and sucked into the vertical screw conveyor 40.
In this way, the mud that has entered the vertical screw conveyor 40 rises due to the rotation of the screw 43, is discharged from the discharge port 47, enters the pressurizing pump 50, is pressurized, and is discharged via a check valve (not shown). It is pressure-fed to the delivery pipe 70, and the delivery pipe 70
The compressed air injected from the air nozzle (ejector) 60 arranged at the inlet of the plug is transported by plug (transport by plug) and transported over a long distance.

Since the dredging device 100 of the present invention excavates the mud layer on the seabed with the drum cutters 30 arranged symmetrically, the horizontal reaction force of the reaction force during excavation is offset and the vertical reaction force is offset. Since the dredging device 100 only receives the reaction force, the dredger 90 equipped with the dredging device 100 is prevented from moving laterally, and swing wires, such as a pump dredger,
No need for spuds. Further, in the second aspect of the invention, the drum cutter is tapered downward, so that the drum cutter is relatively easy to be buried in the mud layer at the initial stage of dredging, and the work efficiency is improved.

[0012]

As described above, in the dredging device of the present invention, since the dredging range is expanded after the intake port is easily submerged in the mud layer on the seabed, the mud with a small amount of residual water can be continuously supplied at a high concentration. In addition to being highly efficient, it can be operated efficiently without obstructing the navigation of other vessels because it can omit swing wires and the like.

[Brief description of drawings]

FIG. 1 is an overall schematic side view of a dredging device according to an embodiment of the present invention.

FIG. 2 is a side view of a main part of the dredging device according to the embodiment of the present invention.

FIG. 3 is a side view of a main portion of a dredging device according to another embodiment of the present invention.

FIG. 4 is a side view taken along the line AA of FIG.

5 is a cross-sectional plan view taken along the line BB of FIG.

FIG. 6 is an overall vertical sectional view of a vertical screw conveyor according to an embodiment of the present invention.

[Explanation of symbols]

 10 Turret 10a Pulley 20 Winch Hoisting Machine 20A Elevating Frame 20a Wire Rope 20b Pulley 22 Support 30 Drum Cutter 31 Rotating Shaft 31a Bearing 32 Drum 32a Main Drum 32b Overhanging Drum 33 Cutter 34 Hydraulic Motor 34a Chain 34b Sprocket 35 Sprocket 40 Type Screw conveyor 41 Casing 42 Rotating shaft 43 Screw 44 Bearing 45 Bearing 46 Hydraulic motor 47 Discharge port 48 Guide groove 49 Support plate 50 Pressurizing pump 60 Air nozzle 70 Discharge pipe 90 Dredger 100 Dredging device

Claims (2)

[Claims] 1. A dredging device mounted on a dredger and suspended on an elevating frame which can be vertically moved up and down by a winch hoist, the dredging device being a vertical screw conveyor and a discharge port of the vertical screw conveyor. And a discharge pipe provided with an air nozzle for injecting compressed air, and a plurality of sets of drums which are fixed to the elevating frame and are symmetrically arranged on both sides of the lower end of the vertical screw conveyor. A dredging device which is formed of a cutter, and the drum cutter has a plurality of cutters protruding from the outer periphery of a drum which is driven to rotate about a horizontal axis at substantially equal intervals. 2. The dredging device according to claim 1, wherein the axial distance between the pair of both drum cutters is increased as the height of the drum cutters is increased.