JP2872503B2 - 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 ooze is transported to landfills mainly through pipelines. 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. Each excavator is formed of a discharge pipe, and each of the excavators has a ribbon screw blade spirally disposed around a rotation axis extending vertically downward and a plurality of excavators projecting on the outer peripheral side of the ribbon screw blade. Together and a cutter, adjacent the ribbon screw blades overlap each other in plan view,
In addition, the respective excavators were arranged so as to be in a non-contact state.

[0005]

The dredging apparatus according to the present invention cuts and excavates an ointment layer by rotating a drill cutter attached to a ribbon screw of a plurality of excavators provided at a lower end portion of a vertical screw conveyor, and overlaps and rotates with each other. The excavator is fluidized by the rotation of the excavator, and the foreign matter mixed in the ooze is removed by the excavator while the ooze is transported upward from the lower end opening of the vertical screw conveyor, and is pressurized by the pump from the discharge port and compressed. By the injection of air, the air is conveyed through the discharge pipe and transported to a remote destination.

If the soft mud is hard or highly sticky, only a single paddle-type excavator will cause the soft mud to adhere in a bridge-like manner to the gap between the upper and lower portions of the excavating cutter as the operation continues, and this will gradually develop. It becomes dango-shaped and the excavating function of the excavating cutter is reduced. Therefore, in the present invention, instead of the paddle type, the ribbon screw blade is arranged and fixed around the rotation axis, and a scraper-shaped excavating cutter is attached to the outer periphery of the ribbon screw blade at an equal pitch, and excavation is performed by the excavating cutter of one excavator.・ The cut ooze is agitated and fluidized by the excavator of the adjacent excavator, and also has a cleaning action. In addition, it also works to eliminate foreign matter intrusion together with the adjacent drilling cutter.

[0007]

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 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 a main part of an excavator showing another embodiment of FIG.
FIG. 6 is a detailed plan view of the excavating cutter.
(A) is a plan view, and FIG. 6 (b) is a side view.

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, 70 is a pump, 80 is an air nozzle,
90 is a discharge pipe, 100 is a flexible pipe, and 200 is an ooze layer. The rudder 20 is joined to the dredge 1 so as to be freely tiltable (elevated) by a horizontal axis, and the other end is connected and supported by a wire rope 32 of a winch hoisting machine 30 provided in the dredge 1. At the tip of the ladder 20, a horizontal pin 22
The bifurcated gantry 50 is pin-joined, and the gantry 5 is moved by the retraction of the piston rod 52a of the attitude control hydraulic cylinder 52 pin-joined between the ladder 20 and the gantry 50.
It is configured to control the tilt of zero. As shown in FIG. 2, a vertical screw conveyor 40 is provided on the fork of the base 50.
The lower end of the vertical screw conveyor 40 is fixed to the gantry with the lower end inclined away from the ladder 20, and surrounds the lower end of a vertical screw conveyor 40 provided with an underwater motor 42 at the upper end (see FIGS. 2 and 3). 5) excavator 60
As shown in FIG. 2, it is arranged to be vertical in the actual operation state. Therefore, the excavator 60 and the vertical screw conveyor 40 are arranged obliquely. Excavator 60 is mounted on gantry 50
A ribbon screw blade 62 is provided around a rotating shaft 64 that is supported by a bearing via a bearing and protrudes downward through a support 62a. Then, as shown in FIG. 5, a plurality of excavating cutters 68 are tangentially fastened to the outer peripheral side of the ribbon screw blade 62 at substantially equal intervals with their tips directed in the rotation direction, and fixed so as to be replaceable. . The excavating cutter 68 is made of a wear-resistant alloy and has a sharp tip, as shown in FIG. The ribbon screw blades 62 of each excavator 60 are sequentially arranged clockwise and counterclockwise alternately, and the ribbon screw blades 6 of the excavator 60 adjacent to each other.
In No. 2, the excavator 60 is arranged so that the tips overlap (overlap) in a plan view, and is driven so that the rotation direction is also clockwise and counterclockwise alternately. The rotation speed of the rotating shaft 64 of each excavator 60 is the same, and the synchronization can be performed electrically, or a single power source can be used and a mechanical method such as gear transmission drive or chain drive can be used. .

In the embodiment shown in FIGS. 2 and 3, the rotating shaft 64 is suspended below the gantry 50 and the three supports 62 are provided.
In a, the ribbon screw blades 62 fixed to the rotating shaft 64 rotate so as not to interfere with the ribbon screw blades 62 of the excavator 60 on both sides, but are particularly suitable for excavating a hard soft mud layer. For this reason, in another embodiment shown in FIG. 4, the strength of the rotary shaft 64 is strengthened as a two-point support by bearing the middle of the rotating shaft 64 with a bearing 54 arranged at the lower end of the gantry 50.

While the vertical screw conveyor 40 is fixed to the gantry 50, the pressure pump 70 and the air nozzle 80
A discharge pipe 90 provided with a flexible pipe (flexible pipe) is fixed to the ladder 20, and the discharge port and the inlet of the pressure pump 70 are connected to the flexible pipe (flexible pipe) 10.
0 is connected. This is because the rudder 20 and the gantry 50 tilt and change the angle.

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 with the dredger fixing and advancing wire 2 or a stopper, and furthermore, a ladder is used for swinging the dredger. A swing wire 3 is stretched on the left and right of 20 (anchor is stretched 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, and the underwater motor 42 of the vertical screw conveyor 40 is driven to drive the hydraulic pump 66 and supply the compressed air to the air nozzle 80, while rotating the hydraulic motor 66 of each excavator 60, The dredging device 10 is swung at a low speed in the dredging direction. First, the ooze in the ooze layer is cut and excavated by the excavation cutter 68 attached to the ribbon screw blade 62, and then the fluid is stirred and fluidized by the excavation cutters 68 adjacent to each other. Is removed to the vicinity of the excavating cutter 68 with the rotation of. In addition, the adjacent excavating cutter 68 removes a particularly viscous soft mud from adhering and developing in the gap between the upper and lower parts of the excavating cutter 68 to perform a cleaning action.

The ooze which has been excavated and fluidized by stirring as described above is taken in from the lower end opening 44 of the vertical screw conveyor 40 located at the center of each excavator 60, and moves upward in the vertical screw conveyor 40. From a discharge port at the upper end, a discharge pipe 90 provided with a pressure pump 70 and an air nozzle 80 is transferred via a flexible pipe 100 and pneumatically conveyed to a remote destination. A check valve may be provided between the pressure pump 70 and the discharge pipe 90 with an air nozzle so that the soft mud in the discharge pipe 90 does not move backward to the pressure pump 70 due to the compressed air injected from the air nozzle 80. When the height of the dredging device 10 is adjusted by operating the winch hoist 30 so that the excavating cutter 68 of the dredging device 10 is covered with the ooze in the ooze layer as much as possible, the unremoved portion of the ooze is reduced,
The amount of seawater taken in is reduced. In addition, drilling cutter 6
8 can be mounted at an arbitrary height of the ribbon screw blade 62 wound spirally in the vertical direction, so that the excavation can be performed in comparison with the paddle type in which the excavation cutter can be mounted only intermittently in the vertical direction. The adhesion and development of the soft mud between the cutters can be reduced.

As described above, according to the present invention, it is possible to collect and transport only the ooze from which foreign substances have been removed in a normal operation state at a high concentration and without much residual water.
Since the ribbon screw blades together with the excavating cutter contribute to excavating and cutting, the entire cross-section excavation and sufficient stirring can be performed. Also, since the stirring blade is a ribbon screw blade,
Mud does not stick to the blades and does not lower the stirring effect. Therefore, high efficiency work can be achieved while maintaining continuous stable operation.

[0014]

As described above, according to the dredging apparatus of the present invention, even a solidified mud or an adhesive soft mud layer can be cut, stirred, and stirred by the excavating cutter attached to the ribbon screw blade.
Fluidization, elimination of foreign matter, and removal of adhered mud are possible, enabling dredging with a high concentration with little residual water, achieving continuous stable operation and improving work efficiency.

[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 side view showing another embodiment of the dredging device according to the present invention.

FIG. 5 is a plan view taken along line XX of FIG. 4;

FIG. 6 is a detailed view of an excavating cutter 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 42 Underwater motor 44 Opening 50 Mount 52 Hydraulic cylinder 52a Piston rod 54 Bearing Reference Signs List 60 excavator 62 ribbon screw blade 62a support 64 rotating shaft 66 hydraulic motor 68 excavating cutter 70 pressure pump 72 underwater motor 80 air nozzle 90 discharge pipe 100 flexible pipe 200 soft mud layer

──────────────────────────────────────────────────続 き 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-4-3832 14528 (JP, A) (58) Field 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,
A pedestal which is connected to a tip of the ladder around a horizontal axis and is provided to be tiltable via a hydraulic cylinder, a vertical screw conveyor fixed to the gantry and having an opening at a lower end, and a lower end of the vertical screw conveyor A plurality of rotatable excavators disposed around the section and mounted on the gantry, a pressure pump connected to a discharge port of the vertical screw conveyor, and a discharge pump having an air nozzle for injecting compressed air. And each of the excavators comprises a ribbon screw blade spirally disposed around a rotation axis extending vertically downward, and a plurality of excavation cutters projecting on the outer peripheral side of the ribbon screw blade. And a dredging device provided with each excavator such that adjacent ribbon screw blades overlap with each other in a plan view and do not contact each other.