KR101853391B1

KR101853391B1 - Multipurpose amphibious dredger

Info

Publication number: KR101853391B1
Application number: KR1020170171946A
Authority: KR
Inventors: 백도선
Original assignee: 백도선
Priority date: 2017-12-14
Filing date: 2017-12-14
Publication date: 2018-06-14

Abstract

The present invention relates to a multipurpose amphibious dredger. The present invention is characterized in which a plurality of buoyancy cylinders are easily assembled to a structure disposed on all four sides of a dredger main body, and a dredging process of the dredger can be facilitated. In addition, the present invention is characterized in which a spud structure is newly improved to allow a trailer to get on and off for moving the dredger and smooth mowing. The present invention is characterized in which a buoyant barrel assembly to the dredger main body can be easily performed in one place by a service crane mounted on the dredger main body. In addition, the present invention is characterized in which a power transmission structure for movement in the water surface is newly improved by a structure of a separate hydraulic motor.

Description

Multipurpose amphibious dredger

The present invention relates to a multipurpose amphibious dredger, and more particularly, to a multipurpose amphibious dredger having a structure in which a buoyant vessel is assembled to a main body of a dredger, a process of loading / unloading the entire dredger to / from a trailer, A new improvement, a power transmission structure for movement on the surface of the water, and the like.

Generally, sludge is deposited by various kinds of wastewater flowing from the land in rainy weather at the bottom of the water such as rivers and lakes, and sludge is accumulated by artificial throwing. Such sludge accelerates water pollution, It is becoming a cause.

Therefore, a dredger is used for sludge removal and dredging on the bottom of rivers and lakes.

The dredger is equipped with appropriate equipments and equipments in accordance with the depth of the water area to be dredged, the kind of the soil at the bottom, and the distance of conveyance of the dredged material, and performs dredging to deepen the depth of river, canal, It is used for collecting soil, sand, minerals including sludge under water, foundation work for underwater structure construction, and pulling up and removing seabed waste.

However, existing dredgers have the following problems.

First, the buoyant bucket must be assembled in the main body of the dredger for underwater movement. Since the conventional buoyant bucket is small size and is simply folded and deployed on both sides of the dredger main body, There is a problem that there is a limit in generating large buoyancy.

Second, if the entire dredger including the buoyant trough is transported to the dredging location, it is necessary to process the entire dredger to and from the large trailer. In the past, due to the use of large cranes, There is a drawback that it takes.

Third, the dredger has an engine that supplies power to an endless track for on-the-road running. By diverting the power of the engine to the propeller for underwater movement, a separate power train The entire powertrain structure including the engine becomes very complicated, thereby causing problems such as an increase in manufacturing cost and a decrease in manufacturing assembling workability.

Fourth, there is a problem that when the mudguard exists in the boundary area between the land and the water, the existing dredger can not go smoothly to the power of the idle orbit only or the endless track when moving from the land to the water.

Korean Registered Patent Registration No. 10-1013508 (January 31, 2011) Korean Registered Patent Registration No. 10-1339890 (December 3, 2013)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems and it is an object of the present invention to improve the structure of a dredger so that a plurality of buoyancy cylinders can be easily assembled to a structure disposed on all sides of a dredger main body, And a new spud structure for moving the dredger to and from the trailer to move the dredger, and a buoyancy assembly to the main body of the dredger, etc. can be easily performed in one place by the service crane mounted on the dredger main body The present invention provides a multipurpose amphibious dredger characterized in that the power transmission structure for movement in the water surface is newly improved by a structure of a separate hydraulic motor.

In order to attain the above object, the present invention provides a dredger main body comprising: a dredger body mounted with a cab at a stern side, an excavator including a boom at a bow side, and an infinite track at the bottom; A plurality of buoyancy cylinders detachably mounted on the right and left sides of the dredger main body and disposed at left and right peripheral portions of the dredger main body; A spool mounted on both sides of the aft side of the dredger main body so as to be adjustable in the forward and backward directions and adjustable in the vertical direction by an angle and a vertical length adjusting device; A cutter for detachably mounting the dredging object to be detachably mounted on the end of the boom of the excavator, and a suction hose for vacuuming the cut dredged material and the suspended matter; Power providing means for moving the dredger main body in water; Wherein the power providing means comprises: a hydraulic cylinder for lifting and lowering the propeller mounted on the rear surface of the dredger main body through a bracket; A propeller housing attached to the piston of the hydraulic cylinder for lifting up and down the propeller and ascending and descending with the lifting and lowering of the piston; A propeller drive hydraulic motor mounted on a rear portion of the propeller housing; A propeller mounted on an output shaft of the propeller driving hydraulic motor and rotationally driven when the propeller is driven in water; And a steering hydraulic cylinder connected between a predetermined position on the rear surface of the dredger main body and one side of the hydraulic cylinder for lifting the propeller, for rotating the hydraulic cylinder and the propeller for the submerged propeller; And a dredger connected to the dredger.

In addition, the angle and vertical length adjusting device may include: an angle adjusting bracket having a mounting end which is hingably fastened to both sides of the aft side of the dredger main body so as to be adjustable in forward and backward directions, and a hollow tube portion through which the spider is inserted, ; An angle adjusting cylinder connected between the angle adjusting bracket and the dredger main body; A vertical length adjustment bracket mounted at a predetermined position of the spool; A vertical length adjusting cylinder connected between a rear side of the hollow tube of the angle adjusting bracket and the upper and lower length adjusting brackets and driven to adjust a vertical length of the spool; .

Preferably, a first hinge end is formed on a rear surface of the dredger main body, and a second hinge end is formed on the outer surface of the angle adjusting bracket, and a first hinge end and a second hinge end, And the fixing pin is locked and inserted into the end of the hinge.

In addition, the buoyancy trough is constituted by a front buoyancy passage which is detachably assembled to the front left and right sides of the dredger main body, and a rear buoyancy trough which is detachably assembled to the rear left and right sides of the dredger main body, And a dovetail directed downward is integrally protruded from the insertion space, and an insertion end inserted into the insertion space is formed integrally with the inner side surface of the front and rear buoyancy cylinders, And a plurality of clamps for mutual locking are mounted on the upper end of the dredger main body and the upper end of each buoyancy barrel.

Preferably, the lower part of the front buoyancy barrel is formed in a round shape so as to minimize the contact area with the ground including the moor field to provide smooth mobility.

In addition, the dredger main body is equipped with a service crane for assembling massive parts including a buoyancy barrel.

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

First, by using the service crane mounted on the dredger main body, it is possible to easily assemble a plurality of buoyancy cylinders on all sides of the dredger main body.

Second, the bottom of the aft buoyancy trough is rounded to facilitate the mowing of the dredger. In addition, a plurality of spuds mounted on the dredger body and angularly mounted, Can be easily achieved.

Third, by using a plurality of spudes that are adjustably and angularly mounted on the main body of the dredger, the dredger can easily be mounted / disembled on the trailer for long distance movement.

Fourth, the structure of the power train including the engine can be simplified by separately providing a propeller driving hydraulic motor and a propeller angle adjusting cylinder for underwater movement separately from the engine for driving the endless track of the ship.

Fifth, when the spud of the dredger is arranged vertically, it is possible to prevent the spud from tilting to one side by fixing the spud to the vertical state by using the fixing pin.

1 is a perspective view showing a multipurpose amphibious dredger according to the present invention,
2 is a side view of a multipurpose amphibious dredger according to the present invention,
3 is a rear view of the multipurpose amphibious dredger according to the present invention,
4 is a cross-sectional view of a main part showing a buoyancy coupling structure of a multipurpose amphibious dredger according to the present invention,
FIG. 5 is a side view illustrating the operation of mounting the multipurpose amphibious dredger according to the present invention to a large-sized trailer to move the dredger to a dredging place.
FIG. 6 is a side view showing an operation in which the multipurpose amphibious dredger according to the present invention easily advances and moves on a mown field,
FIG. 7 is a perspective view showing the use state of the multipurpose amphibious dredger according to the present invention,
8 is a view showing a quick clamp for easily detaching and attaching various dredging mechanisms to a boom of a multipurpose amphibious dredger according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show a multipurpose amphibious dredger according to the present invention, and reference numeral 10 denotes a dredger main body.

A cab 11, a service crane 18, an excavator 13, and an endless track 14 for moving are mounted or mounted on the dredger main body 10 for various operations such as shipment and assembly.

More specifically, an operation room 11 for the entire operation and operation of the dredger is mounted on the stern side of the upper surface of the dredger main body 10, an excavator 13 including a boom frame 12 is mounted on the side of a bow, At the bottom, an endless track 14 for land movement is mounted.

A dredging tool 50 (for example, a cutter for cutting dredged material) for dredging an object to be dredged and a suction hose 52 for vacuum-sucking the cut dredged material and suspended matter are provided at the end of the boom stand 12 of the excavator 13 Respectively.

In addition to the basic configuration of these dredgers, dredgers require a buoyancy vessel to provide buoyancy for work on the water besides the land.

To this end, a plurality of buoyancy tubes 20 disposed on left and right circumferential portions of the dredger body 10 may be removably assembled to the left and right sides of the dredger main body 10.

The buoyancy tank 20 includes a front buoyancy tube 21 detachably assembled to the front left and right sides of the dredger main body 10 and a rear buoyancy tank 22 detachably assembled to left and right rear sides of the dredger main body 10, The buoyancy bucket 20 can be easily lifted and lowered by using the service crane 18 when assembling the buoyancy vats 20.

The rear buoyancy tube 22 is detachably assembled to the rear left and right sides of the dredger main body 10. The rear buoyancy tube 22 is detachably assembled to the front left and right sides of the dredger main body 10, 4, a dovetail 17 is formed on the side of the dredger main body 10, and a dovetail groove 23, which is a kind of groove, is formed on the inner side surfaces of the buoyancy cylinders 21, Is applied.

More specifically, horizontally inserted spaces 19 are formed on the left and right sides of the dredger main body 10, and a dovetail 17 directed downward on the upper surface of the inserted space 19 is integrally formed Respectively.

On the other hand, on the inner side surfaces of the front and rear buoyancy tubes 21 and 22, a coupling end 24 inserted into the insertion space 19 is formed integrally with the upper surface of the insertion end 24, And a dovetail groove 23 is formed to be inserted and seated.

A plurality of clamps 25 for locking the upper end of the dredger main body 10 and the upper ends of the buoyancy cylinders 21 and 22 are mounted.

Therefore, the front and rear buoyancy cylinders 21 and 22 are lifted up to the side of the dredger main body 10 by using the service crane 18 and brought into close contact with each other, The dovetail 17 and the dovetail groove 23 on the side of the dredger main body 10 are inserted into the space 19 after the coupling end 24 of the front and rear buoyancy cylinders 21, The buoyancy cylinders 21 and 22 are easily assembled to the dredger main body 10 by locking-coupling the plurality of clamps 25 after matching each other.

At this time, the lower surface in front of the buoyancy bucket 21 is formed as a round surface 26 from the front to the rear so as to minimize the contact area with the ground including the moor field to provide smooth mooring mobility.

As described above, by using the service crane 18 mounted on the dredger main body 10, it is possible to easily assemble a plurality of buoyancy cylinders 21, 22 to both side portions of the dredger main body 10, So that the mowing of the dredger can be easily carried out.

On the other hand, a spud 30 is installed on both sides of the stern body 10 so as to be adjustable in the fore and aft direction and adjustable in the vertical direction by a predetermined angle and a vertical length adjusting device 40, 10 is equipped with a secondary spud 32 which can only be lifted and lowered.

The spud 30 is a means for fixing the dredging line in a dredging operation. The spud 30 adjusts the angle in the forward and backward directions and adjusts the length in the vertical direction by the angle and vertical length adjusting device 40 at both positions on the rear side of the dredger main body 10 Respectively.

In particular, the angle and vertical length adjustment device 40 includes a mounting end 41-1 which is hinged to both sides of the stern side of the dredger main body 10 so as to be angularly adjustable in forward and backward directions, And an angle adjusting bracket 41 having a hollow tube portion 41-2 integrally formed thereon.

An angle adjusting cylinder 42 is connected between the angle adjusting bracket 41 and the dredger main body 10.

A vertical length adjusting bracket 43 is mounted at a predetermined position of the spool 30 and a gap between the rear surface of the hollow tube 41-2 of the angle adjusting bracket 41 and the upper and lower length adjusting bracket 43 And a cylinder 44 for adjusting the length of the flour 30 is mounted for adjusting the length of the flour 30.

Therefore, when the piston of the angle adjusting cylinder 42 is driven in the pulling direction, the mounting end 41-1 of the angle adjusting bracket 41 and the hollow tube portion 41-2 are pulled, And at the same time, the angle of the spud 30 inserted through the hollow tube portion 41-2 of the angle adjusting bracket 41 is adjusted to tilt forward from the vertical position.

At this time, when the piston of the up-and-down length adjusting cylinder 44 is driven in the advancing direction, the vertical length adjusting bracket 43 mounted on the spool 30 ascends and descends and the spool 30 also ascends and descends, And the height of the flood is adjusted.

Therefore, by supporting a plurality of spudes, which are mounted on the dredger main body so as to be adjustable in length and angle, on the ground during the dredging operation, the dredging operation can be smoothly performed together with the fixing of the dredger.

Also, the dredger main body 10 can be easily moved up and down with respect to the trailer for remote movement by using the spud 30.

For example, as shown in FIG. 6, when the auxiliary spud 32 is held in contact with the ground while the spud 30 is lowered by a predetermined length in a vertical state, the dredger body 10 is moved from the ground to a predetermined height In this state, the trailer is moved backward to place the loading portion of the trailer below the dredger main body 10, and then the spool 30 is raised and lowered by a certain length again, and the auxiliary spud 32 is raised and lowered The dredger main body 10 is mounted on the trailer for a long distance movement.

Thus, the dredging operation position far away from the storage place of the dredger main body 10 and the buoyancy tank 20, which are easily mounted on the trailer, can be smoothly moved far away.

In addition, the spud 30 can be used as a tool for moving the dirt field together with the dredger 50 mounted on the boom frame 12 of the excavator.

For example, if there is a midge field on the path of the dredger to the dredging operation position, the forward movement may not be smooth by only the infinite track 14 of the dredger main body 10, The dredging tool 50 mounted on the dredger 12 of the excavator and the pulling operation of the dredger 12 at the same time as pulling the dredger 30 The dredger main body 10 can smoothly move out of the mine field.

At this time, when the dredger main body 10 and the buoyancy tank 20 are moved out of the meadow or the like to the desired primary dredging place (water surface), the spud 30 is moved to the ground surface The dredging work can be smoothly performed together with the fixing of the dredger, and then the movement from the first dredging place to the second dredging place (the water surface) may be required.

However, in order to perform the underwater movement of the dredger main body 10, separate power train arrangements, which are conventionally driven by the rotational force of a propeller connected to the engine, are required for power transmission between the engine and the propeller. The structure can become very complicated.

The power transmission means 60 for moving the dredger main body 10 in the water is provided in the dredger main body 10 so as to provide power to the dredger main body 10 separately from the engine As shown in FIG.

3, a hydraulic cylinder 62 for mounting and lowering the propeller is mounted on the rear surface of the dredger main body 10 as a constitution of the power transmitting means 60. As shown in Fig.

The propeller housing 64 is mounted on the piston 63 which moves forward and backward in the direction of the water surface in the main body of the propeller vertical hydraulic cylinder 62. The propeller housing 64 ) Is rotatably mounted with a propeller 66 that rotates for underwater advancement.

More specifically, a propeller driving hydraulic motor 65 is mounted on the rear portion of the propeller housing 64. A propeller 66 is mounted on the output shaft of the propeller driving hydraulic motor 65 for rotation in water movement do.

Between the predetermined position on the rear side of the dredger main body 10 and one side of the hydraulic cylinder 62 for vertical landing of the propeller is provided a propeller housing 62 including a hydraulic cylinder 62 and a propeller 66 for up- The steering hydraulic cylinder 67 for rotating the steering wheel 64 is mounted.

The propeller housing 64 and the propeller 66 are moved into the water while the piston 63 of the hydraulic cylinder 62 for descending the propeller is lowered and the propeller driving hydraulic motor 65 is driven in succession , The propeller 66 is driven to rotate and the dredger is moved in the water.

At this time, by driving the piston of the steering hydraulic cylinder 67 forward or backward, the propeller housing 64 including the hydraulic cylinder 62 and the propeller 66 rotates to the left or right, The steering direction can be easily performed.

The propeller housing 64 including the hydraulic cylinder 62 and the propeller 66 may be mounted on the dredger main body 62 by moving the piston 63 of the hydraulic cylinder 62 for ascending and descending the propeller up and down during the land movement of the dredger, The propeller can be protected at the time of land movement by being located higher than the bottom surface position of the land 10.

7, when an external force is applied to the spud 30 during the dredging operation in a state where the spud 30 is vertically arranged and supported, that is, the vertical state of the spud 30 The angle adjusting bracket or the like, which is a part of the spool 30, may be damaged, and the spool 30 may fall down to one side.

3, a first hinge section 15 is formed on a rear surface of the dredger main body 10 and a second hinge section 45 is formed on an outer surface of the angle adjusting bracket 41. [ So that the vertical state of the spud 30 can be ensured by inserting the fixing pin 16 into the first and second hinge stages 15 and 45 which coincide with each other.

That is, since the spool 30 is inserted into the hollow tube portion 41-2 of the angle adjusting bracket 41, the second hinge end 45 of the angle adjusting bracket 41 is connected to the dredger main body 10 The vertical position of the spud 30 is ensured by locking the fixing pin 16 in the first and second hinge stages 15 and 45 And it is possible to prevent an accident that the spud 30 is moved to one side.

8, in order to easily replace various dredging tools 50 including an hydraulic cutter, a cram cell, a bucket, a wide bucket, and a rake bucket at the end of the boom frame 12, A quick clamp 54 capable of attaching and detaching is mounted.

That is, at the front end of the boom frame 12 of the excavator mounted on the dredger, a variety of attachments (hydraulic cutter, cram cell, bucket, wide bucket, rake bucket, etc.) It is possible to easily replace various dredging tools according to the working conditions and environment of various dredging sites by mounting the quick clamp 54 so that the dredging work can be easily changed and used at the work site and thus the efficiency and workability of the dredging work can be improved .

On the other hand, the anti-corrosive coating layer may be applied to the surface of the buoyancy tube 20 to prevent the corrosion of the surface, and the surface coating material of the metal material according to the present invention for preventing the corrosion phenomenon may include: 5 wt% of boron, 5 wt% of Carboxy Methyl Cellulose (CMC), 5 wt% of zirconium, 5 wt% of titanium and 45 wt% of aluminum oxide (Al 2 O 3).

Benzotriazole is added for the purpose of preventing corrosion and preventing discoloration, and boron serves as a deoxidizer.

CMC (Carboxy Methyl Cellulose) is a white or whitish powder with high water absorption. It is easily dissolved in water to exhibit viscosity, forming a film, and acting as a dispersant.

Zirconium acts to enhance abrasion resistance and corrosion resistance, and titanium is a corrosion-resistant transition metal element with excellent water resistance and corrosion resistance.

Aluminum oxide is added for the purpose of refractoriness and chemical stability.

The reason why the proportions of the constituent components are limited as described above is that the present inventors have analyzed through several test results, and as a result, showed the optimum corrosion preventing effect at the above ratios.

In addition, the surface of the propeller 66 may be provided with an antifouling coating layer applied with a composition for antifouling coating so as to effectively prevent and remove the adhesion of the antifouling agent. The antifouling coating composition contains sodium hydroxide and alkyl betaine, and the total content of sodium hydroxide and alkyl betaine is 1 to 10 wt% with respect to the total aqueous solution.

The sodium hydroxide and alkyl betaine are preferably used in an amount of 1 to 10% by weight based on the total weight of the composition. When the content is less than 1% by weight, the coating properties of the base material deteriorate. When the content exceeds 10% by weight, Precipitation tends to occur.

On the other hand, as a method of applying the present anti-fouling coating composition to the surface of the propeller 66, it is preferable to apply it by a spray method. The thickness of the final coated film on the propeller 66 is preferably 500 to 2000 angstroms, and more preferably 1000 to 2000 angstroms. When the thickness of the coating film is less than 500 ANGSTROM, there is a problem that it deteriorates in the case of a high-temperature heat treatment. When the thickness is more than 2000 ANGSTROM, crystallization of a coated surface tends to occur.

10: Dredger main body
11: Cab
12: The boom
13: Excavator
14: Infinite orbit
15: First hinge plate
16: Fixing pin
17: dovetail
18: Service crane
19: Insertion space
20: buoyancy bucket
21: forward buoyancy bucket
22: rear buoyancy bucket
23: Dovetail Home
24: coupling end
25: Clamp
26: Round face
30: Spud
32: Secondary Spud
40: Angle and vertical length adjuster
41: Angle adjustment bracket
41-1: Mounting stage
41-2: hollow tube portion
42: Cylinder for angle adjustment
43: Upper and lower length adjustment bracket
44: Cylinder for adjusting the length
45: second hinge pin
50: Dredging tools
52: Suction hose
54: Quick clamp
60: Power transmission means
61: Bracket
62: Hydraulic cylinder for propellers
63: Piston
64: Propeller housing
65: Hydraulic motor for propeller drive
66: Propeller
67: Hydraulic cylinder for steering

Claims

An excavator (13) having a boom tower (12) is mounted on the aft side of the cab and a dredger main body (10) equipped with an endless track (14) for land movement on the bottom.
A plurality of buoyancy cylinders 20 detachably mounted on the left and right sides of the dredger main body 10 and disposed at left and right peripheral portions of the dredger main body 10;
A spud 30 mounted on both sides of the aft side of the dredger main body 10 so as to be adjustable in the fore and aft direction and adjustable in the vertical direction by the angle and vertical length adjusting device 40;
A dredging tool 50 detachably mounted at an end of the boom frame 12 of the excavator 13 for dredging a dredged object and a suction hose 52 for vacuum suctioning the cut dredged material and suspended matter;
Power transmission means (60) for underwater movement of the dredger main body (10);
/ RTI >
The power transmission means (60) comprises:
A hydraulic cylinder (62) for lifting and lowering the propeller mounted on the rear surface of the dredger main body (10) via a bracket (61);
A propeller housing (64) mounted on the piston (63) of the hydraulic cylinder (62) for ascending and descending the propeller and ascending and descending with the ascending and descending of the piston (63);
A propeller driving hydraulic motor 65 mounted on a rear portion of the propeller housing 64;
A propeller 66 mounted on an output shaft of the propeller driving hydraulic motor 65 and rotationally driven during the movement; And
A propeller housing 64 including a hydraulic cylinder 62 and a propeller 66 connected to a predetermined position on the rear side of the dredger main body 10 and a side portion of the hydraulic cylinder 62 for vertically moving the propeller, A steering hydraulic cylinder 67 for rotating the steering wheel;
Characterized in that the dredger is connected to the dredger.

The method according to claim 1,
The angle and vertical length adjusting device 40 comprises:
A mounting end 41-1 which is hinged so as to be angularly adjustable in forward and backward directions and a hollow tube portion 41-2 through which the spud 30 is inserted are integrally formed on both sides of the aft side of the dredger main body 10 A bracket 41 for adjusting the angle of the bracket 41;
An angle adjusting cylinder 42 connected between the angle adjusting bracket 41 and the dredger main body 10;
A vertical length adjustment bracket 43 mounted at a predetermined position of the spool 30;
A vertical length adjusting cylinder 44 connected between the rear surface of the hollow tube 41-2 of the angle adjusting bracket 41 and the upper and lower length adjusting bracket 43 for adjusting the length of the spool 30 ;
A first hinge section 15 is formed on a rear surface of the dredger main body 10 and a second hinge section 45 is formed on an outer surface of the angle adjusting bracket 41 so that a vertical state of the spool 30 Characterized in that the fixing pin (16) is lock-inserted into the first hinge end (15) and the second hinge end (45) which are in agreement with each other so as to ensure that the fixing pin (16) is locked.

The method according to claim 1,
The buoyancy tank 20 includes a front buoyancy tube 21 detachably assembled to the front left and right sides of the dredger main body 10 and a buoyancy bucket 21 detachably assembled to left and right rear sides of the dredger body 10. [ 22,
On the left and right side surfaces of the dredger main body 10, a dovetail 17 directed downward is integrally protruded,
Horizontal insertion spaces 19 are formed on the left and right sides of the dredger main body 10 and a dovetail 17 directed downward is integrally protruded on the upper surface of the insertion space 19,
The coupling end 24 inserted into the insertion space 19 is formed integrally with the inner side surfaces of the front and rear buoyancy tubes 21 and 22 and the dovetail 17 The dovetail groove 23 is formed in the groove 23,
A plurality of clamps (25) for mutual locking are mounted on the upper end of the dredger main body (10) and the upper ends of the buoyancy pipes (21, 22)
Wherein the lower portion of the front buoyancy tube (21) is formed as a round surface (26) so as to minimize the contact area with the ground including the moor field to provide smooth mooring field mobility.

The method according to claim 1,
And a service crane (18) is mounted on the dredger main body (10) for assembling a heavy component such as a buoyant barrel.

The method according to claim 1,
Wherein a quick clamp (54) for attaching and detaching various dredging tools (50) including a hydraulic cutter, a cram cell, a bucket, a wide bucket, and a rake bucket is mounted at the end of the boom stand (12).