JPH0551941A - High-concentration dredging device - Google Patents

Abstract

(57) [Summary] [Purpose] Dredging soft mud accumulated in water, such as sludge, at a high concentration with less pollution. [Structure] The suction pipe 13 of the sand pump 12 fixed to the main body frame F is connected to the opening at the lowest position of the other end which is fixed to the main body frame F so that the upper portion is opened. The rotor 4 in which the scraping blades 3 are mounted at equal intervals between the circular plates 2 provided in parallel with the traveling direction of the main body frame F is mounted on the cylindrical pipe 1 so that the rotor 4 can be rotated by the hydraulic motor 7. 4 and an exhaust pipe for supplying compressed air into the hood 9 fixed to the main body frame F so as to cover at least the upper half of the cylindrical pipe 1 and discharging excess air into the atmosphere. 11 is connected to the lowermost end, and an underwater camera 14 that monitors the state of the soft mud 8 that has been scraped up by the scraping blades 3 of the rotor 4 is attached to the upper part of the hood 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-concentration dredging apparatus capable of dredging soft mud accumulated in water such as sludge with a high concentration with less pollution.

[0002]

2. Description of the Related Art Conventionally, there have been a grab dredging method and a pump dredging method as a dredging method for soft mud accumulated in water such as sludge. However, the former grab dredging method not only pollutes the surrounding environment due to the large amount of polluted water because it sprinkles a large amount of polluted water in the water and the atmosphere after excavating the soft mud with a grab, but also the excavated traces. There was a drawback that it became uneven. The latter pump dredging method is a method of drooling soft mud together with water. Therefore, the sludge content is usually about 10 to 20% and the balance is water, so a very large amount of extra water is sent and energy is consumed. However, there is a disadvantage that not only the loss is large but also a large landfill is required, and the treatment of dredging surplus water requires huge cost.

Therefore, recently, an apparatus capable of dredging soft mud at a high concentration for the purpose of eliminating such defects has been disclosed in Japanese Patent Application Laid-Open No. 2-296933 and "Work Vessel" No. 1
No. 87 (January 30, 1990, issued by the Japan Work Vessel Association), etc. The former JP-A-2-296
The "dredging device" proposed in Japanese Laid-Open Patent Publication No. 933 is a rotary body provided with a slide excavating blade that can project outward in the radial direction, and a plate-like shape attached to the outer periphery of the rotary body with a desired gap. It is a dredging device that lifts mud cut from the ground by the bottom cutting blade, but it is a device that absorbs soft mud by rotating the screw conveyor in water and it is not possible to exclude the intrusion of excess water in the water In addition, it is necessary to increase the inner diameter of the rotating body so that the slide drilling blade can be accommodated.Furthermore, since the screw conveyor is attached to the outer periphery of this rotating body, the equipment becomes large-scale, and the dredging capacity is higher than the dredging capacity. There is a drawback in that it is uneconomical because the device and the dredger equipped with it become large.

The latter, "Work Vessel" No. 187, "High Concentration Soft Mud Dredger," is a semi-cylindrical, airtight hood submerged in the bottom of the water, and very slowly moves the bucket wheel for excavation. It is a dredger that rotates and transports the soft mud excavated by the bucket wheel to the assisting device by the screw conveyor, and the upper part of the bucket wheel is hermetically sealed by the hood to ensure a high concentration of the soft mud. However, a dredger with such a structure
Since the bucket wheel is provided with a soft mud reservoir at the center thereof and a screw conveyor for transferring the soft mud excavated by the bucket wheel, the above-mentioned JP-A-2-2969.
Similar to the device described in Japanese Patent No. 33, the structure is large and uneconomical, and the excavation width per one swing / one forward cannot be made large due to the mechanism of the bucket wheel.
It is difficult to make the lap width constant during the swing of the stripe,
It had the drawback of poor construction efficiency.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional apparatus and provides an apparatus having a relatively simple structure capable of dredging the sludge accumulated on the bottom of the water with a high concentration and a high efficiency. The challenge is to provide.

[0006]

As a result of earnest research to solve the above-mentioned problems, the present inventor has found that one end is closed and the other end is at the lowest position on the body frame attached to the arm or ladder of a dredger or amphibious excavator. A cylindrical pipe with an open top and an open top is suspended and fixed, and a plurality of scraping blades are mounted at equal intervals between two or more circular plates provided in parallel with the traveling direction of the main body frame. A rotor mounted on the cylindrical pipe so that the rotor can be rotated at a rotational speed equal to or higher than the traveling speed by a hydraulic motor mounted on the main body frame. Fix the hood to the body frame so that it covers at least the upper half of the pipe so that the mud is being excavated in the air. A supply pipe that supplies compressed air and an exhaust pipe that discharges excess air in the hood to the atmosphere are connected, and the suction port of a sand pump fixed to the main frame is attached to the lowest opening of the cylindrical pipe. If you connect a pipe and attach an underwater camera to the upper part of the hood to monitor the condition of the soft mud that has been scraped up by the scraping blades of the rotor, it is compact in structure and amphibious excavation for soft mud dredging in small and medium rivers. Can be installed in the machine,
The present invention has been completed by studying that it is possible to dredge soft mud in a high concentration state economically without requiring a large hull even in a port.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a high concentration dredging device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing a front part of a hood of a high concentration dredging device according to one embodiment of the present invention with a front portion cut away in a traveling direction, FIG. 2 is a front view showing the front hood removed, and FIG. 3 is a rotor. 4 is a side view of the same, FIG. 4 is a side view of the cylindrical pipe, FIG.
FIG. 3 is a front view showing a state in which the device of the present invention is mounted on an arm or a ladder of a dredger or an amphibious excavator. In the drawing,
1 is the arm or rudder of a dredger or amphibious excavator 2
It is a cylindrical pipe that is suspended and fixed to a main body frame F that is attached to 0, one end is closed and the other end is attached with a flange 1a at the lowest position and is open, and the upper part is open. It serves as a fixed shaft that supports the periphery of the shaft so that it can rotate.

Reference numeral 4 denotes two or more sheets (in the illustrated embodiment) provided in parallel with the traveling direction (swing) of the high-concentration dredging device according to the present invention (direction of arrow in FIG. 1, front side of paper surface in FIG. 2). A plurality of scraping blades 3 are provided at the same intervals (6 in the illustrated embodiment) by the reinforcing members 18 each formed of a short tube between the four annular plates 2 in the example.
The number of attached rotors, and the reinforcing material 1
It is attached to the cylindrical pipe 1 by 8 so that it can rotate smoothly. About two-thirds of the rear side in the traveling direction of the rotor 4 is a fall prevention cover 19 fixed to a hood 9 described later in order to prevent the soft mud 8 scraped up by the scraping blades 3 from falling. It is preferably covered. A large sprocket 6 is fixed to the rotor 4 by a reinforcing member 18, and is connected to a small sprocket 5 fixed to a drive shaft of a hydraulic motor 7 mounted on the main body frame F via a roller chain 17. The rotor 4 has the same rotation speed (usually 3 m) as the traveling speed of the high-concentration dredging device according to the present invention (arm of dredger or amphibious excavator or swing speed of the rudder 20).
/ Min to 6 m / min) or higher. Reference numeral 15 is a grid-like net which is attached to the entire outer peripheral surface of the rotor 4 as necessary when a large number of contaminants such as dust are present at the dredging target location.

Reference numeral 9 denotes a hood fixed to the main body frame F so as to cover at least the upper half of the rotor 4 and the cylindrical pipe 1, and has a compressor (not shown) inside thereof.
A supply pipe 10 for supplying compressed air from the top of the hood 9 to the upper part of the hood 9 and the excess air in the hood 9 blown into the water from the side surface of the hood 9 to the bottom of the hood 9 to the atmosphere so as not to cause pollution. The exhaust pipe 11 for discharging is connected. Thus, the rotor 4 and the cylindrical pipe 1
Since at least the upper half of the inside is kept airtight by the hood 9, excess water falls downward when the soft mud 8 moves into the air from the water, which is the same situation as when excavating in the air. ..

A suction pipe 13 is connected to the sand pump 12 fixed to the body frame F,
The soft mud 8 that has been scraped up by the scraping blades 3 of the rotor 4 and carried to the uppermost portion continuously drops into the cylindrical pipe 1 from the upper open portion of the cylindrical pipe 1, and the opening portion of the cylindrical pipe 1 at the lowest position. The sand is sucked by the sand pump 12 through the suction pipe 13 connected to the flange 1a.

Reference numeral 14 denotes an underwater camera for monitoring, which is attached to the upper part of the hood 9 for monitoring the state of the soft mud 8 which has been scraped up by the scraping blades 3 of the rotor 4 and, if necessary, the hood. It is equipped with a plateau that irradiates the inside of 9. Further, 16 is a viscous soft mud 8, and when the soft mud 8 does not fall from the rotor 4, the soft mud 8 is forcibly forced into the cylindrical pipe 1.
It is a hydraulic actuator that is optionally attached to the upper part of the hood 9 to be pushed in.

Reference numeral 20 denotes an arm or rudder of a dredger or an amphibious excavator to which the device of the present invention is attached via a trunnion 21 as shown in FIG. 7, so that the device of the present invention is always horizontal even if the water depth changes. By the command from the inclinometer 22 which is fixed to the body frame F and measures the inclination,
A hydraulic cylinder 23 is provided for horizontally adjusting the device of the present invention.

Reference numeral 24 denotes a rubber hose for connecting the sand pump 12 of the apparatus of the present invention and the discharge pipe 27 attached to the arm of the amphibious mud truck or the dredger rudder 20.
Reference numeral 25 is a reverse valve for preventing backflow, and 26 is an air supply port for supplying compressed air when the dredged soft mud 8 is discharged for a long distance.

[0014]

With the high-concentration dredging device according to the present invention having the above-described structure, the operation of dredging the sludge 8 or other sludge on the bottom of the water at a high concentration without causing pollution and taking in excess water will be described below. Explained.

First, the main body frame F of the high-concentration dredging device according to the present invention is attached to the arm or rudder 20 of a dredging ship or an amphibious excavator via a trunnion 21 as shown in FIG. Thus, the hydraulic cylinder 23 is operated to adjust the device of the present invention so that it is always horizontal, and the device is lowered into the water to be dredged.

Thus, when the lower end of the cylindrical pipe 1 suspended and fixed to the main body frame F is located at substantially the same height as the surface of the soft mud 8 deposited on the water bottom, at least the upper half of the rotor 4 and the cylindrical pipe 1 is covered. Body frame F
Compressed air is supplied from the supply pipe 10 to the inside of the hood 9 which is fixed to the hood 9, and excess air is discharged into the atmosphere from the exhaust pipe 11 connected to the lowermost end of the hood 9 to hermetically seal the inside of the hood 9. Hold on.

In this state, the hydraulic motor 7 attached to the main body frame F is driven so as to rotate at the same rotation speed as the swing speed of the arm of the dredger or amphibious excavator or the rudder 20 or higher. , A large sprocket 6 fixed from a small sprocket 5 to a rotor 4 via a roller chain 17 by a reinforcing material 18.
The rotor 4 rotatably supported around the cylindrical pipe 1 is rotated by rotating the rotor 4. The rotation speed of the rotor 4 is the same as the swing speed of the arm of the dredger or the amphibious excavator or the swing speed of the rudder 20 so as not to take in excess water when the dredging is the soft mud 8 having a high water content. However, in the case of hard cohesive soil, it is necessary to add water so that mud can be sent smoothly, so that the rotor speed is set higher than the swing speed of the dredger or amphibious excavator arm or the rudder 20 swing speed. You should take in and. Arms or rudder 2 for dredgers and amphibious excavators like the former
In order to rotate the rotor 4 at the same rotation speed as the swing speed of 0, a signal is taken in from a gyro compass (not shown) mounted on the arm of the dredger or amphibious excavator or the rudder 20 to automatically or manually. The rotation speed of the hydraulic motor 7 may be controlled.

In the rotor 4 rotated in this way, the scraping blades 3 are arranged at the same intervals by the reinforcing members 18 each formed of a short tube between two or more circular plates 2 provided parallel to the traveling direction. Since a plurality of sheets are attached to the soft mud 8 scraped up by the scraping blades 3 of the rotor 4,
Is raked up inside the hood 9 without falling by the fall prevention cover 19 covering about two-thirds of the rear side of the rotor 4 in the swing direction, and excess water falls downward to reach the uppermost portion. The soft mud 8 drops into the cylindrical pipe 1 continuously from the upper opening of the cylindrical pipe 1 in the same situation as when excavating in the air. At this time, if the grid-like net 15 is attached to the entire outer circumference of the rotor 4, even if the soft mud 8 at the dredging target location contains a large number of foreign matters such as dust, these foreign matters are prevented by the grid-like net 15 from the rotor 4. Since it does not enter into the inside 4, the sand pump 12 is not damaged, and the softened mud 8 sent is easily treated.

Since the suction pipe 13 connected to the sand pump 12 is connected to the flange 1a of the opening at the lowest position of the cylindrical pipe 1, the soft mud 8 falling into the cylindrical pipe 1 is sanded. After being sucked by the pump 12, the arm of the dredger or amphibious excavator or the rudder 2 is passed through the rubber hose 24 and the reverse valve 25 for preventing backflow.
The sludge is discharged to a predetermined place from the discharge pipe 27 attached to 0. At this time, when the soft mud 8 is discharged for a long distance, compressed air is supplied from the air supply port 26 into the discharge pipe 27.

At this time, the underwater camera 14 attached to the upper part of the hood 9 is used to monitor the condition of the soft mud 8 picked up by the raking blades 3 of the rotor 4 and the water content is adjusted as much as possible. The swing speed of the arm or rudder of the dredger or amphibious excavator and / or the rotation speed of the rotor are controlled so that the amount of the soft mud 8 is strong and the soft mud 8 does not fall from the rotor 4 in the hood 9. It suffices to operate the hydraulic actuator 16 attached to the upper part.

[0021]

As described above in detail, in the high concentration dredging device according to the present invention, the upper portion of the cylindrical pipe, which is the shaft for rotatably supporting the rotor, sucks the sludge in comparison with the conventional device. Therefore, since a complicated machine such as a bucket wheel or a screw conveyor is not required, the dredging capability can be increased by increasing the rotor width with a small size and light weight. Therefore, a working machine equipped with the device of the present invention,
The dredger is small and good economy.

Since the soft mud is taken in from the upper part in the airtight hood, even in the case of the soft mud having a large water content, in the process of scraping the soft mud with the rotor blades into the airtight hood. Since excess water drops, it is possible to dredge with a high mud content, and now that it is difficult to secure landfill, there is an effect that the landfill capacity is economical.

Further, the sink speed of the arm or rudder of the dredger or amphibious excavator and the rotation of the rotor are set to 3 m /
The extremely slow speed of about 6 to 6 m / min has the advantages that the soft mud is not stirred and there is almost no internal pollution.

Since the apparatus of the present invention is equipped with an underwater camera for monitoring in the upper part of the hood in order to monitor the state of the soft mud which has been picked up by the blades of the rotor, this underwater camera is used for the rotor. Monitors the condition of the soft mud that has been picked up by the blades of the drone, and controls the swing speed of the arm or rudder of the dredger or amphibious excavator and / or the rotation speed of the rotor to reduce the water content as much as possible. Therefore, it is possible to dredge a high-concentration soft mud in a stable state at all times.

When a grid-like net is attached to the entire outer circumference of the rotor, even if the soft mud at the dredging target location contains a large number of foreign matters such as dust, the foreign matter is sucked together with the soft mud. Therefore, there is an advantage that the sand pump is not damaged and the sent sludge is easily treated.

Further, when a hydraulic actuator is installed in the upper part of the hood so as to force the soft mud into the cylindrical pipe, even if the soft mud to be dredged has a strong viscosity and the soft mud does not drop from the rotor, By operating the actuator, the dredged soft mud can be reliably sent through the sand pump, and this effect can be obtained by using the underwater camera installed in the hood to check the condition of the soft mud that has been picked up by the rotor's lifting blades. The effect that can be monitored can be exerted more effectively.

The industrial value of the device of the present invention having various effects as listed above is extremely great.

[Brief description of drawings]

FIG. 1 is a side view showing a front portion of a hood of a high concentration dredging device according to an embodiment of the present invention in a traveling direction by cutting out.

FIG. 2 is a front view showing the front side hood of FIG. 1 with the hood removed.

FIG. 3 is a side view of a rotor.

FIG. 4 is a front view of FIG.

FIG. 5 is a side view of a cylindrical pipe.

FIG. 6 is a front view of FIG.

FIG. 7 is a front view showing a state in which the device of the present invention is mounted on an arm or a ladder of a dredger or an amphibious excavator.

[Explanation of symbols]

 F Main body frame 1 Cylindrical pipe 1a Flange 2 Disc plate 3 Rubbing blade 4 Rotor 5 Small sprocket 6 Large sprocket 7 Hydraulic motor 8 Soft mud 9 Hood 10 Supply pipe 11 Exhaust pipe 12 Sand pump 13 Intake pipe 14 Underwater camera 15 Lattice-shaped Net 16 Hydraulic actuator 17 Roller chain 18 Reinforcement material 19 Fall prevention cover 20 Arm or rudder of dredger or amphibious excavator 21 Trunnion 22 Inclinometer 23 Hydraulic cylinder 24 Rubber hose 25 Reverse valve 26 Air supply port 27 Discharge pipe 27

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[Procedure amendment]

[Submission date] December 18, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Reference numeral 14 denotes an underwater camera for monitoring, which is attached to the upper part of the hood 9 for monitoring the state of the soft mud 8 which has been scraped up by the scraping blades 3 of the rotor 4 and, if necessary, the hood. A light source for irradiating the inside of 9 is provided. Further, 16 is a viscous soft mud 8, and when the soft mud 8 does not fall from the rotor 4, the soft mud 8 is forcibly forced into the cylindrical pipe 1.
It is a hydraulic actuator that is optionally attached to the upper part of the hood 9 to be pushed in.

Claims (3)

[Claims] 1. A cylindrical pipe (1), which is suspended and fixed to a main body frame (F), has one end closed and the other end opened at the lowest position and an upper part opened, to the main body frame (F). A rotor (4) having a plurality of scraping blades (3) mounted at equal intervals between two or more circular discs (2) provided parallel to the traveling direction is rotatably mounted. The large sprocket (6) fixed to the rotor (4) is attached to the body frame (F) of the hydraulic motor (7)
It is connected via a roller chain (17) to a small sprocket (5) fixed to the drive shaft of the main body frame (F) so as to cover at least the upper half of the rotor (4) and the cylindrical pipe (1). The hood (9) fixed to is connected to the upper part with a supply pipe (10) for supplying compressed air to the inside, and to the lowermost end with an exhaust pipe (11) for discharging excess air into the atmosphere. The suction pipe (13) of the sand pump (12) fixed to the body frame (F) is connected to the lowest opening of the cylindrical pipe (1),
In the upper part of the hood (9), the scraping blades (3) of the rotor (4)
A high-concentration dredging device, which is equipped with an underwater camera (14) for monitoring the state of the soft mud (8) that has been scraped up by. 2. A mesh (15) in a grid pattern on the outer peripheral portion of the rotor (4).
The high-concentration dredging device according to claim 1, which is attached. 3. An actuator (1) for forcing the soft mud (8) into the cylindrical pipe (1) in the upper part of the hood (9).
The high-concentration dredging device according to claim 1 or 2, wherein 6) is attached.