JP2872498B2 - Dredging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dredging apparatus used for dredging soft mud such as sludge deposited on the sea floor, lakes, marshes, rivers, ports and intakes of power plants.

[0002]

2. Description of the Related Art As a conventional dredging apparatus, there is a pump type. In this pump-type dredging apparatus, 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 sea or lake, so that the soft mud is sucked up together with the water. The dredged mud is transported to landfills mainly by carriers. In landfills, after sedimentation of the mud, the sewage is treated with a coagulant and discharged.

[0003]

However, in the above-mentioned conventional dredging apparatus, the amount of water sucked up at the same time as the ooze is too large, and a large-capacity disposal site is required. However, there is a disadvantage that the For this reason, the present applicant has proposed an inlet device provided with an inlet cutter at the lower end of a vertical screw conveyor and a dredging device provided with a mud collecting hood (Japanese Patent Application Nos. 2-116881 and 2-145303). , Japanese Patent Application No. 2-145304). These dredging devices are excellent dredging devices that can suck only the ooze, while the intake is buried in the ooze layer on the seabed to prevent intrusion of seawater as much as possible. However, in the case of a relatively hard material composed of the above, there is a drawback that even if the inlet cutter of the inlet device alone can excavate, sufficient stirring and fluidization cannot be performed thereafter.

[0004]

SUMMARY OF THE INVENTION In order to solve these problems, a dredging device according to the present invention is a dredging device which is mounted on a dredger and is disposed at the tip of a rudder tilted by a winch hoist. A pedestal fixedly mounted on the pedestal and having an opening at a lower end thereof, a vertical screw conveyor fixed to the end of the ladder by a pin connected around a horizontal axis, and being tiltable via a hydraulic cylinder; It comprises a plurality of rotatable excavators arranged around the lower end and supported on the gantry, a pressure pump connected to a discharge port of the vertical screw conveyor, and an air nozzle for injecting compressed air. And each of the excavators is provided with a plurality of excavating cutters projecting in a plurality of radial directions and vertically spaced apart from each other at an appropriate distance from each other. Tsu and 挾在 protrude vertically between gap motor arranged, in which the opening of the vertical screw conveyor with a vertically reciprocable shutter gate and reciprocating means for interrupting communication.

[0005]

According to the dredging apparatus of the present invention, after raising the shutter gate in the dredging direction (swing direction) of the vertical screw conveyor to communicate with the opening, the excavator of the plurality of excavators provided at the lower end of the vertical screw conveyor is driven. The cutting and excavation of the ooze layer is performed by the rotation of the cutter, and fluidization is achieved by the rotation of the adjacent digging cutter that overlaps and rotates. At the same time, foreign matter mixed in the ooze is removed by the digging cutter while the ooze is removed by the vertical screw conveyor. It is transported upward from the lower end opening, pressurized by a pressure pump from a discharge port, and conveyed by air through a discharge pipe by injection of compressed air and transported to a remote destination.

If the soft mud is hard or highly sticky, the soft mud adheres to the gap between the upper and lower parts of the excavator in a bridge-like manner and develops into a dango-like shape as the continuation of the operation, and the excavating function of the excavator decreases. . As a countermeasure in this case, an excavating cutter adjacent to the upper and lower gaps sweeps and excavates while also performing a cleaning action. In addition, fluidization is promoted by another drilling cutter entering the gap. When foreign matter enters the gap, the adjacent excavating cutter acts to remove it. When the forward direction is reversed, the opening so far is closed, and the shutter gate in the opposite direction is raised to open the opening.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 relate to an embodiment of the present invention. FIG. 1 is an overall side view of a dredger, FIG. 2 is a side view of a dredging apparatus, FIG. 3 is a plan view of a dredging apparatus, and FIG. FIG. 5 is a side view of the lower end of a vertical screw conveyor.

In the drawing, 1 is a dredger, 10 is a dredging device, 20 is a ladder, 30 is a winch hoist, 32 is a wire rope, 40 is a vertical screw conveyor, 50 is a gantry,
60 is an excavator, 62 is an excavator, 70 is a pump,
80 is an air nozzle, 90 is a discharge pipe. The rudder 20 is joined to the dredger 1 so that it can be freely tilted (elevated) by a horizontal axis.
The other end is connected and supported by a wire rope 32 of a winch hoisting machine 30 installed in the dredger 1. A bifurcated gantry 50 is pin-joined to the tip of the ladder 20 by a horizontal pin 22, and the extension of a piston rod 52 a of a posture control hydraulic cylinder 52 pin-joined between the ladder 20 and the gantry 50. The tilting of the gantry 50 can be controlled by the retreat. As shown in FIG. 2, the lower end of the vertical screw conveyor 40 is fixedly mounted on the fork at the fork of the mount 50 so that the lower end of the vertical screw conveyor 40 is away from the ladder 20, and a submersible motor 42 is provided on the upper end. Conveyor 40
A plurality of (five in the embodiment of FIGS. 2 and 3) excavators 60 are disposed so as to surround the lower end of the excavator so as to be vertical in an actual operation state, as shown in FIG. Therefore, the excavator 60 and the vertical screw conveyor 40 are arranged obliquely. The excavator 60 is supported on the gantry 50 via bearings, and a plurality of (three in the embodiment of FIG. 3) excavating cutters 62 projecting horizontally in the radial direction on the rotating shaft 64 projecting downward. A plurality of stages at equal intervals (3 in the embodiment of FIG. 2)
Stage or four stages).

Each of the excavating cutters 62 is disposed so as to enter a gap above and below the excavating cutter 62 of the adjacent excavating machine 60, and as shown in FIG.
The area (sweep circle) of the excavator 62 of the other excavator 60 enters the sweep circle of the excavator 62 of the other excavator 60 and overlaps. The rotary shaft 64 on which the excavating cutter 62 is implanted is driven to rotate in the same direction by a hydraulic motor 66 provided on the top of the excavator 60. And the direction of rotation rotates toward the mountain side from the valley of the ooze layer. The reason is that the ooze muddy and fluidized is scattered to the valley side and brought to the dense hill side of the ooze layer to be taken in by the vertical screw conveyor 40 so as not to be unrecoverable. FIG. 4 is a work explanatory diagram showing the relationship between the dredging progress direction and the excavating cutter rotation direction.
4A is a plan view, and FIG. 4B is a longitudinal sectional view.

The opening 44 at the lower end of the vertical screw conveyor 40 is provided at at least two places on the circumference. In the embodiment shown in FIG. 5, two openings 44 are provided at the front and rear, and a shutter gate 45 which can reciprocate up and down and which can reciprocate between the openings 44 and the inside thereof and a hydraulic cylinder 46 as reciprocating means are arranged at each of them. Set up. A lower bearing 40a supports the screw shaft.

Next, the operation of the dredging device configured as described above will be described. After the dredger 1 equipped with the dredging device 10 of the present invention circulates to the dredging site and stops, the rear part of the dredger is fixed by the dredger fixing and advancing wire 2 or a stopper. Further, in order to swing the dredger 1, swing wires 3 are set on the left and right sides of the ladder 20 (anchor is installed on the sea floor). The ladder 20 is tilted down by operating the winch hoisting machine 30, and the dredging device 10 is buried in the soft mud layer. Then, the gantry 50 is tilted and fixed so that the excavator 60 becomes vertical by operating the hydraulic cylinder 52 for attitude control. Thereafter, the operation state is entered, the shutter gate 45 of the opening 44 facing the dredging direction is raised, and the underwater motor 42 of the vertical screw conveyor 40 is driven to drive the pressure pump 70 and supply compressed air to the air nozzle 80. While rotating the hydraulic motor 66 of each excavator 60, the dredging device 10 swings at a low speed in the dredging direction. First, the ooze in the ooze layer is cut and excavated by the excavation cutter 62, and then the fluid is stirred and fluidized by the excavation cutters 62 adjacent to each other, and foreign matter contained in the ooze is excavated along with the rotation of the excavation cutter 62. It is removed to the vicinity of the cutter 62. In addition, the adjacent excavating cutter 62 removes particularly strong sticky soft mud from adhering and developing in the gap between the upper and lower parts of the excavating cutter 62 and performs a cleaning action. The ooze excavated and stirred and fluidized as described above is supplied to the lower end opening 44 of the vertical screw conveyor 40 located at the center of each excavator 60.
It is taken up, moves upward in the vertical screw conveyor 40, and is transferred from the discharge port at the upper end to a discharge pipe 90 provided with a pressure pump 70 and an air nozzle 80, and is conveyed to a remote destination by air. The compressed air injected from the air nozzle 80 causes the soft mud in the discharge pipe 90 to be pumped by the pump 70.
A check valve may be provided between the pressure feed pump 70 and the discharge pipe 90 with the air nozzle so as not to move backward. The excavating cutter 62 of the dredging device 10 operates the winch hoist 30 so that the drilling cutter 62 is covered with the ooze in the ooze layer as much as possible.
Adjusting the height of 0 reduces the residual amount of the ooze and reduces the amount of seawater taken in.

As described above, according to the present invention, it is possible to collect and transport only the ooze from which foreign matter has been removed in a normal operation state at a high concentration and without much residual water.
Clogging of the gap between the top and bottom of the excavator can be prevented as much as possible, so that continuous stable operation can be maintained and high efficiency work can be achieved. In addition, since the opening is opened only in the front of the dredging direction, there is little ooze left behind, and most ooze can be removed.

[0013]

As described above, according to the dredging device of the present invention, cutting, agitation, fluidization, foreign matter removal, and removal of adhering mud, even with hardened mud or soft muddy layer, with an excavating cutter can be performed. As a result, dredging of high concentration with little residual water becomes possible, continuous stable operation is achieved, and work efficiency is improved. Also, there is little ooze left behind in the ooze layer.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view of a dredger showing an embodiment according to the present invention.

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

FIG. 3 is a plan view showing an embodiment of the dredging device according to the present invention.

FIG. 4 is a work explanatory view showing an embodiment of the dredging device according to the present invention.

FIG. 5 is a side view of a lower end portion of a vertical screw conveyor showing an embodiment of the dredging device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dredge 2 Dredge fixed / advance wire (Christmas tree) 3 Swing wire 10 Dredging device 20 Ladder 22 Pin 30 Winch hoist 32 Wire rope 40 Vertical screw conveyor 40a Lower bearing 42 Underwater motor 44 Opening 45 Shutter gate 46 Hydraulic cylinder 50 Mount 52 Hydraulic cylinder 52a Piston rod 60 Excavator 62 Drilling cutter 64 Rotating shaft 66 Hydraulic motor 70 Pressure pump 72 Underwater motor 80 Air nozzle 90 Discharge pipe

Continuation of the front page (56) References JP-A-6-116976 (JP, A) JP-A-4-38331 (JP, A) JP-A-4-38332 (JP, A) JP-A-4-14528 (JP) , A) (58) Fields surveyed (Int. Cl. ⁶ , DB name) E02F 3/88

Claims (1)

(57) [Claims] 1. A dredging device provided at a tip of a rudder mounted on a dredge and tilted by a winch hoist, which is pin-joined to a tip of the rudder around a horizontal axis and is tiltable via a hydraulic cylinder. A pedestal provided, a vertical screw conveyor fixed to the pedestal and having an opening at a lower end, and a plurality of rotatable shafts arranged around the lower end of the vertical screw conveyor and supported by the gantry. Excavator, a pressure pump connected to a discharge port of the vertical screw conveyor, and a discharge pipe having an air nozzle for injecting compressed air, each of which extrudes in a plurality of radial directions, The excavator is provided with a plurality of stages of excavating cutters which are separated from each other by an appropriate distance in the vertical direction. Dredging apparatus comprising a vertical reciprocable shutter gate and reciprocating means for interrupting communication.