JPH03191122A - Dredging device - Google Patents

Abstract

PURPOSE:To make it possible to progress dredging work of a soft muddy layer solidified at the bottom of the water smoothly and continuously for a long period of time by providing mid-raking paddles to both sides of the end of a vertical type screw conveyer, providing shearing paddles to both outsides thereof. CONSTITUTION:A vertical type screw conveyer 1 is provided, and a pair of right and left mid-raking paddles 10 provided with a plurality of inclined blades 10a are provided to both sides of the end thereof. After that, a pair of right and left shearing paddles 20 provided with a plurality of vertical plate-like cutter blades 20a are provided to both outsides. Then, a shutter 6 capable of opening and closing in the vertical directions is provided between the mid-raking paddles 10 and shearing paddles 20, and bar screens 30 and 30 are provided between the cutter blades 20a of the shearing paddles 20 in the approximately vertical direction. Soft mud solidified at the bottom of the water is sheared with the cutter blades 20a, it is raked in the central direction with the mid- raking paddles 10, it is raised in a cylindrical body 2 by the vertical type screw conveyer 1, and it is discharged from a discharge-port of the upper end.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to dredging, which is used, for example, to dredge soft mud such as sludge accumulated in water intakes of power plants, seabeds, lakes, rivers, ports, etc. It is related to the device.

[Conventional technology] There is a pump type dredging device as a conventional dredging device.

This pump-type dredging device installs a large-capacity pump on a barge or the like, and extends a hose from the pump to the bottom of the ocean, such as the bottom of a lake, and sucks up the soft mud along with the water. The soft mud dredged in this way is mainly transported to a landfill by a carrier ship. At the landfill, solidifying agents and flocculants are added to solidify the waste.

[Problems to be Solved by the Invention] However, in the conventional dredging equipment described above, the amount of water that is sucked up at the same time as the soft mud is so large that the solidifying agent cannot be mixed until after the surplus water is treated. The drawback is that water treatment requires a lot of money. Also,
When the thickness of the soft mud layer on the ocean floor is large, it is possible to capture the seabed portion, but it is not possible to fully capture the portion above it.

[Means for Solving the Problems 1] In order to solve the above-mentioned problems, the dredging device of the present invention includes a vertical screw conveyor, and a horizontal rotation shaft disposed on both sides of the tip of the vertical screw conveyor. A pair of left and right centering paddles each having a plurality of inclined blades for transporting the conveyed material in the direction of the vertical screw conveyor while separated by a predetermined distance in the axial direction; A pair of left and right shearing paddles each having a plurality of vertical plate-shaped cutter blades attached at a predetermined distance in the axial direction on a horizontal rotation axis parallel to the shifting paddle rotation axis, and between the center shifting paddle and the shearing paddle. A dredging device equipped with a shutter that can be opened and closed in the vertical direction and a means for opening and closing the shutter, the dredging device having a structure in which a par screen that stands approximately vertically between each of the cutter blades in the axial direction of the shear paddle is provided. And so.

[Function] In the dredging device of the present invention, first, among the shearing paddles located at the outermost end of the tip of the vertical screw conveyor, the shearing paddle in the traveling direction of the vertical screw conveyor is rotationally driven, and the shearing paddle on the downstream side in the traveling direction is driven to rotate. Close the shutter in front of the shear paddle. Then, when a dredger equipped with a dredging device moves forward at low speed, the upstream shearing paddle shears the solidified soft mud layer deposited on the water bottom and separates it into small pieces with rotating cutter blades. The separated soft mud is moved to the middle paddle located in the center of the dredging equipment, and the rotating middle paddle scrapes the soft mud toward the center, and the rotation of the blades of the vertical screw conveyor causes it to rise inside the cylinder and reach the top end. It is discharged after reaching the discharge port.

Foreign objects such as rocks, pieces of wood, and pieces of iron interposed in the soft mud are blocked by the bar screen that stands between the cutter blades of the shearing paddle, and do not reach the intermediate paddle or the vertical screw conveyor.

When the dredger moves in the opposite direction, the same operation as described above is repeated with the shutters on both sides reversed.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

1 to 4 relate to embodiments of the present invention, and FIG. 1 is a vertical cross-sectional view of main parts showing one embodiment of the dredging device according to the present invention, and FIG.
The figure is a plan sectional view taken from Fig. 1 - ■, and Fig. 3 is Fig. 2 m -
Figure 4 is a side view taken from FIG. 2 rV-IV.

The vertical screw conveyor 1 includes a cylindrical body 2 and a screw 3 that is rotatably housed within the body 2. The screw 3 lifts soft mud such as sludge. It is now possible to do so. The screw 3 is
It is connected to a motor (not shown) disposed on the upper end side of the cylindrical body 2, and is configured to be rotationally driven by the motor. Further, the cylindrical body 2 is provided with a casing 7 at its tip for taking in soft mud, and as shown in FIG.
'It has two openings on both sides.

There are screws 3 on both sides of the tip of the vertical screw conveyor l.
and a pair of centering paddles 10 that rotate around a horizontal rotational axis so as to embrace the rotational axis 3a and have a plurality of inclined blades 10a attached with a predetermined distance in the axial direction.
The inclined blades 10a overlap when viewed from the axial direction, and are arranged so as not to interfere with each other. As shown in FIG. 2, the inclined blades 10a of this centering paddle 10 have opposite directions of inclination with respect to the center vertical screw conveyor 1 as a boundary, and are directed in the direction of the arrow shown in the figure. It is designed to transport objects. That is, by driving one centering paddle with the hydraulic motor 10b, the other centering paddle is driven by a gear, and the pair of centering paddles are rotationally driven in opposite directions and synchronously.

Furthermore, on the outside of the middle paddle lO, there is a middle paddle lO.
A shearing paddle 20 in which a plurality of vertical plate-shaped cutter blades 20a are attached at regular intervals to a horizontal rotation axis parallel to the rotation axis of O.
are arranged, one set each on the left and right.

Reference numeral 8 denotes an overhanging casing, which prevents the soft mud cut and fluidized by the shear paddles 20 from spreading around.

As shown in FIG. 1, the cutter blades 20a of this shearing paddle 20 are formed of four vertical plate-shaped blades arranged every 90 degrees, and have a tip curved in the opposite direction to the rotation direction. The part is thinner. Adjacent cutter blades have different attachment angles of 45° from each other. The rotating shaft of the cutter blade 20a attached in this manner is rotationally driven by a hydraulic motor 20b connected to one end.

In addition, as shown in FIGS. 1 and 2, the middle paddle 10
and the shearing paddle 20, which can reciprocate in the vertical direction,
A panel-shaped shutter 6 driven by a hydraulic cylinder 6a fixed to the cylindrical body 2 is disposed, and has a structure capable of blocking communication between the centering paddle lO and the shearing paddle 20.

The inclined blade 10a of the centering paddle 10 is shown in FIG.

In addition to using the panel (plate shape) shown in Figure 3,
A screw-shaped one formed of a curved surface may also be used.

As shown in FIG. 1, the par screen 30 is a substantially U-shaped plate that stands vertically and is attached to the casing 7 by tightening bolts at both ends. It may be a bar screen 30a with a single (single plate) structure, or a bar screen 30b with a double (multiple plate) structure as shown on the left, which makes it easy to remove seaweed or vinyl cloth caught on the par screen with the cutter blade 20a. However, bar screen 30 and cutter blade 20
For a, provide some gap to avoid contact interference.
32 is a grid-like screen provided further inside.

Next, the operation of the dredging device configured as above will be explained.

A driving device of a dredger (not shown) is operated to move the intermediate paddle 10 located at the tip of the vertical screw conveyor 1. The shear paddle 20 is inserted into the soft mud at the bottom of the water, and the drive device (not shown) for the screw 3 is rotated. At the same time, the shutter 6 on one side is lowered by the operation of the hydraulic cylinder a, and the hydraulic motor 10b of the intermediate paddle lO is lowered. and the hydraulic motor 20b of the shearing paddle 20 on the upstream side, and
and rotates the upstream shear paddle 20. The downstream shear paddle 20 stops rotating.

Then, as the dredger quietly moves upstream at low speed,
By the rotation of the shearing paddle 20 on the upstream side, the solidified soft mud around the intake section is cut in the longitudinal direction and is fluidized and transferred toward the intermediate paddle 10.

The soft mud that has reached the centering paddles 10 moves along the axial direction of the centering paddles to the center vertical screw conveyor 1 in the direction of the arrow shown in FIG. It enters the cylindrical body 2 due to the action. In addition,
Large foreign substances in the soft mud are obstructed by the par screen 30 and the grid-like screen 32 and are prevented from flowing into the mud.

On the other hand, the soft mud introduced into the cylindrical body 2 from the centering paddle 10 rises within the cylindrical body 2 by the rotation of the screw 3, and is discharged from a discharge port (not shown) to a predetermined location. For example, the soft mud discharged from the vertical screw conveyor 1 is mixed with a solidifying agent and then dumped into a landfill via a transport ship, a pressure hose, or the like.

If the diameter of the screw 3 is large, some amount of foreign matter can be tolerated, so the pitch and bar screen of each inclined blade of the shearing paddle and centering paddle should be adjusted.

The pitch of the grid screen may be relatively large.

[Effects of the Invention] As described above, according to the present invention, even if the soft mud layer has a large thickness and is solidified, most of the soft mud can be directed to the shear paddle, so the uptake efficiency is excellent. ing.

At the same time, since the soft mud is introduced into the screw conveyor with less surplus water, it is possible to significantly reduce the cost of soft mud processing. In addition, shear paddles and shutters are installed on both sides of the tip of the screw conveyor, making it possible to operate only the shear paddles on the upstream side in the direction of travel.Also, a par screen or lattice screen is installed to remove foreign matter. Since the soft mud is gathered to the center by the action of the centering paddle, the movement of the soft mud into the vertical screw conveyor progresses smoothly, and smooth operation of the screw conveyor can be ensured continuously over a long period of time.

[Brief explanation of drawings]

1 to 4 relate to the present invention, FIG. 1 is a vertical cross-sectional view of essential parts showing one embodiment of the dredging device according to the present invention, and FIG.
Figure II-II plane sectional view, Figure 3 is Figure 2 m-m
FIG. 4 is a side view as viewed from FIG. 2 IV--2. 1... Vertical screw conveyor, 2...
Cylindrical body, 3... Screw 6...
...Shutter, 6a...Hydraulic sill, 6b
...Guide, 7...Casing, 8
...... Overhanging casing, 10 ... Centering paddle, 10a ... Slanted blade, 20 ... Shearing paddle, 20a ... Cutter blade, 30 ...・／Hae screen, 32... Lattice screen.

Claims (1)

[Claims] (1) A vertical screw conveyor, and a plurality of conveyors disposed on both sides of the tip of the vertical screw conveyor, each having a horizontal rotating shaft and transporting objects in the direction of the vertical screw conveyor while being separated by a predetermined distance in the axial direction. A pair of left and right centering paddles each having a plurality of inclined blades attached thereto, and a plurality of centering paddles disposed on both outer sides of the centering paddle and spaced apart by a predetermined distance in the axial direction about a horizontal rotation axis parallel to the centering paddle rotation axis. A dredging device comprising a pair of left and right shearing paddles to which vertical plate-shaped cutter blades are attached, a shutter that can be opened and closed in the vertical direction between the centering paddle and the shearing paddle, and a means for opening and closing the shutter. . A dredging device, wherein a bar screen is provided that stands approximately vertically between each of the cutter blades in the axial direction of the shearing paddle.