JP2000220164A - Dredging equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a dredging device capable of efficiently raising mud with a high mud content regardless of the viscosity of dredged earth and sand or sludge. A mud-raising transport device (20) is arranged on a floating body (10) so as to be able to move up and down. The mud-raising transport device (20) supports a main screw (22b) in an up-down cylindrical cylinder (21) and has a main screw (22b). On the lower end side, a square screw-shaped auxiliary screw body 25 of the same pitch meshing with the main screw 22b, a part of the blades of the two screws 22b and 25b overlap each other in plan view, and moreover, the main screw 22b It is provided so as to rotate at the same rotation speed in the direction opposite to the rotation direction, and is configured to transfer the dredged earth and sand onto the floating body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dredging device for earth and sand such as harbors, estuaries, lakes and marshes, and ponds and sludge.

[0002]

2. Description of the Related Art In harbors, estuaries, etc., in order to maintain the water depth of the navigation channel, sediment and sludge deposited from rivers and the like are dredged. Dredging earth and sand on the bottom of the lake.

[0003] In addition, surplus food and excretion of cultured fish and shellfish in the sea area and water area where the farm is located, wastewater flows into lakes and marshes and ponds, and sludge and sludge accumulate to deteriorate water quality. In order to kill creatures on the bottom of the water, the sludge and sludge are dredged as one of the measures to prevent eutrophication, water purification and odor control. Heretofore, dredging of these materials such as earth and sand, sludge and the like is mainly performed by a pump barge, and a part of the dredging is performed by a drag suction boat or a grab barge.

[0004] However, a pump barge or a drag suction ship uses a vortex pump to continuously draw soil and sludge from a suction port of a suction pipe lowered to the water bottom to perform dredging. Is drawn into the water flow created by the pump, sucking the sediment and sludge from the bottom of the water,
Since it is a method of transporting the soil and sludge sucked by the water flow in the pipe, it is necessary to suck the soil and sludge together with a large amount of water, and the dredging efficiency is poor. In addition, this centrifugal pump has a structural problem that when the soil concentration increases, suction resistance increases and cavitation occurs.

Further, in the case of the centrifugal pump, since the amount of water to be recovered is remarkably large with respect to the amount of soil and sludge, sewage treatment such as provision of a settling pond for sedimentation of soil and sludge is required. There is a problem that the cost rises and a problem that it is necessary to deal with the occurrence of secondary pollution during the treatment of sewage, resulting in a large cost.

On the other hand, in the grab barge, the grab is suspended, the grab is dropped to the bottom of the water, and the grab is closed by hydraulic pressure or the like, so that the grab is grasped. By opening the grab above and dropping sediment and sludge, dredging is performed intermittently, that is, by badge processing.

[0007] However, in this grab method, the grab content is high because the grab cuts off the water and grabs the soil directly, but the intermittent badge-type mud raising method for raising and lowering the grab increases the dredging efficiency. There is a problem that it is very bad, and because the grab is moved up and down in the water to scoop up the soil and drain on the water surface, part of the sediment held by the grab and mud attached to the grab diffuse into the water, There is a problem that the dredged water area is polluted.

In order to cope with these problems, the dredging should be continuously performed in a high concentration state with a small amount of water having a high mud content while preventing pollution in the dredging water area, and reducing the amount of sewage treatment. As described in JP-A-3-191122 and JP-A-4-277227, a vertical type in which a helical screw is rotated in a vertically supported cylindrical casing to convey earth and sand. A screw conveyor dredging device has been proposed.

[0009]

However, in the case of these vertical screw conveyor systems, the helical screw is rotated in the casing, and the ooze loaded on the screw blades is moved upward by the screw action due to the screw rotation. When the screw is small and the cylindrical cylinder or screw has a small diameter, it is possible to transport the soil and sludge sufficiently. Because the speed is increased, the rotation speed is reduced, while the weight of the fluidized soil by some means does not change, so the operation of scraping it and pushing it into the casing becomes insufficient with only the lower screw blade, There is a problem of inefficiency.

[0010] In other words, in the single-blade vertical screw conveyor system, when the dredged soil and sludge have a high viscosity, the high-viscosity soil and sludge stick to the screw blades, and Since the space between the pitches is closed, there is a problem that the volumetric efficiency is reduced and the mud raising efficiency is reduced.

On the other hand, when the viscosity of the dredged soil and sludge is low, a single-blade vertical screw conveyor system does not pressurize from the bottom. Sludge leaks from the gap between the screw and the cylindrical casing provided in the up-down direction and descends.

In the dredging apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 3-191122, the screw conveyor is rotated around a horizontal rotation axis so as to hold a screw and a rotation axis on both sides of a lower end of the screw conveyor, and after dredging, it becomes oozed and flows. A middle paddle having a plurality of inclined blades for transferring the condensed earth and sand from the side to the lower end of the screw conveyor is provided.

[0013] However, this centering paddle only serves to gather the surrounding earth and sand inside the overhang casing from the side to the center where the lower end of the vertical screw conveyor is located, and pushes the earth and sand into the cylindrical cylinder. However, it is not possible to assist the mud raising of the vertical screw itself by applying pressure from below, so that the problem of poor mud raising efficiency cannot be solved.

In the dredging apparatus disclosed in Japanese Patent Application Laid-Open No. 4-277227, a solidified soft mud layer is formed at the lower end of a screw conveyor with a paddle cutter attached to a horizontal rotating shaft inside a mud intake of a mud collecting hood. Shearing vertically,
Stirring, fluidizing, and furthermore, providing a plurality of tom-shaped inlet cutters in the casing containing the screw at the lower end of the screw conveyor, and rotating the casing together,
A device has been proposed in which vertically cut ooze is horizontally sheared, agitated, and fluidized, and the mud is raised by suction force generated by rotation of a screw of a vertical screw conveyor.

However, even in the dredging apparatus provided with the inlet cutter and the paddle cutter, the cylinder to which the inlet cutter is attached has a large opening, and the lower end of the vertical screw conveyor is largely opened by this opening. Since the mud function has only one blade screw of the vertical screw conveyor, the mud raising efficiency is low as described above, and a large power is required to rotate the inlet cutter with the casing,
There is a problem that the device becomes complicated and large, the power consumption increases, and the dredging cost increases.

The present invention has been made to solve the above-mentioned problems, and the objects thereof are as follows. Firstly, a first object is to provide a dredging device capable of efficiently raising dredged soil and sludge with a high mud content.

It is a second object of the present invention to provide a dredging device capable of efficiently raising mud of dredged earth and sand while preventing the generation of peripheral pollution. It is a third object of the present invention to provide a dredging device capable of efficiently raising mud with a high mud content and increasing the accuracy of a dredging position to efficiently dredge a dredged water area.

[0018]

The dredging device for achieving the above object is constituted as follows. 1) A mud carrier device is arranged on a floating body so as to be able to move up and down. The mud carrier device supports a main screw in a vertical cylindrical cylinder, and at the lower end side of the main screw,
The auxiliary screw body having the same pitch in the form of a square screw meshing with the main screw, the blades of the two screws partially overlap each other in plan view, and rotated at the same rotation speed in the direction opposite to the rotation direction of the main screw. So that the dredged earth and sand is transferred onto the floating body.

With this configuration, when only the blades of the main screw are used, soil with high viscosity sticks to the blades of the main screw to deteriorate the volume ratio and decrease mud elevating efficiency. In this case, a situation occurs in which the mud raising efficiency decreases due to leakage from the gap between the cylindrical cylinder and the main screw, and soil and sand cannot be transported efficiently.
This can be avoided by providing this auxiliary screw.

That is, as the main screw rotates, the square screw-shaped auxiliary screw having the same pitch meshing with the main screw rotates in reverse, so that the blade of the square screw-shaped auxiliary screw is placed on the blade of the main screw. Raises the earth and sand to prevent high viscosity earth and sand from sticking.

Further, since the earth and sand fed between the main screw and the cylindrical cylinder can be pushed up by a square screw-shaped auxiliary screw inserted between the pitches of the main screw and pressurized from below, low viscosity Sediment can be prevented from leaking and descending.

Therefore, it is possible to raise the mud with a high mud content of both the high and low viscosity soils, and the mud raising by the main screw is efficiently performed. 2) Alternatively, a mud lifting device is arranged on the floating body so as to be able to move up and down, and the mud raising device supports a main screw in a vertical cylindrical cylinder and an inlet at a lower end of the cylindrical cylinder. A closed casing having an opening is connected and provided, and a vane pump is provided in the opening, and the dredged soil outside the closed casing is pressure-fed to the main screw by the vane pump, and the dredged sand is placed on the floating body. It is configured to be transported.

According to the configuration having the closed casing,
Since sediment during dredging can be confined inside the casing and mud can be raised with a vertical screw, it is possible to prevent the surrounding water from being sucked and reduce the mud content, and to prevent the sediment from flowing into the surrounding water area. The outflow can be prevented to prevent the surrounding pollution.

Further, by providing a vane pump at the opening of the closed casing, the sludge outside the closed casing is sucked and pushed into the vertical screw conveyor, and the pressure in the closed casing is increased to thereby increase the pressure inside the closed casing. By pressurizing from the lower side, it pushes up the earth and sand between the pitches of the main screw, preventing burrs,
Since earth and sand are prevented from leaking and descending from between the cylindrical cylinder and the main screw, mud rising by the main screw can be efficiently assisted, and dredging efficiency can be improved. 3) Alternatively, a mud lifting transport device is disposed on the floating body so as to be able to move up and down. The mud lifting transport device supports a main screw in a vertical cylindrical cylinder, and has a lower end side of the main screw. A square screw-shaped auxiliary screw body of the same pitch meshing with the main screw, a part of the blades of both screws overlap each other in plan view, and furthermore, rotate at the same rotational speed in the direction opposite to the rotation direction of the main screw. In addition, a closed casing having an opening is connected to the suction port at the lower end of the cylindrical cylinder, and a vane pump is disposed in the opening, and the dredged earth and sand outside the closed casing is removed by the vane pump. It is configured to transfer dredged earth and sand onto the floating body by pumping to the main screw. With this configuration, the operation of the auxiliary screw and the operation and effect of the closed casing and the vane pump can be shared.

The lower end of the above-mentioned mud raising and conveying apparatus is configured as follows. 4) In the mud raising and conveying apparatus, a casing having a front opening and a rear opening which can be opened and closed is provided at a lower end portion of the main screw, and at the time of dredging, the front opening and the rear opening are provided. One is opened and the other is closed so that it can proceed to the open side to allow dredging, and an intake device provided with a foreign matter removing member and an ooze fluidizing device is provided inside the both openings. Is done.

According to this configuration, the cylindrical cylinder equipped with the vertical main screw is connected to the box-shaped casing whose bottom is sealed with the dredging surface or the bottom plate of the casing and has an opening only in the dredging direction. With the movement of the filling device, the mud is absorbed as it is in the box-type casing, and the mud is made to flow with high mud content. The pollution of the surrounding water area can be prevented because the outflow of water can be suppressed.

Further, a front opening and a rear opening that can be opened and closed are provided at front and rear positions of the casing, respectively.
Since one side of the traveling direction is open and the other is closed and dredging,
It is not necessary to change the direction by rotating the mud raising conveyance device by half a turn, and the dredging work at the time of reciprocation can be easily performed, so that the efficiency of the dredging work is improved.

[0028] In addition, the solidified earth and sand and the sludge that have been solidified can be made into a soft mud and fluidized by an ooze fluidizing device provided on the inner side of each of the openings, so that it can be easily transported by a vertical screw conveyor. Since foreign matter can be removed by the foreign matter removing device, clogging and failure of the vertical screw conveyor, the auxiliary screw body, the vane pump, and the like can be prevented, and the transfer efficiency is improved.

These mud raising and conveying devices are arranged on a floating body as follows. 5) A plurality of spuds that can reach the water bottom are provided on the outer periphery of the floating body, and an opening is provided in the center of the floating body. The floating body is independently moved in two directions intersecting in plan view across the opening. A movable carriage whose position can be controlled is provided, and the above-described mud lifting transport device is arranged on the movable carriage.

According to this configuration, the floating body is fixed to the sea floor with a plurality of spuds and is substantially not affected by waves, so that the intake device provided at the lower end of the mud lifting device can be accurately positioned with respect to the water bottom. By moving the intake device back and forth in the front-rear direction and intermittently stepping in the left-right direction, the water bottom below the opening can be dredged with high accuracy.

Further, since the dredging position can be controlled with high accuracy, the overlap width between the previous dredging portion and the next dredging portion can be reduced. As a result, the number of movements for dredging can be reduced to increase the efficiency of dredging, and it is possible to eliminate unevenness, which is unevenness on the sea bottom, and obtain a highly accurate finished surface. In addition, since the work can be performed even if the weather and sea conditions are somewhat roughened, the range of workable weather and sea conditions is expanded, and the dredging efficiency as a whole is improved.

In addition, since the floating body is fixed by the spuds, it is not necessary to extend a mooring line around the floating body. Can be navigated, and the influence on the navigating ship can be reduced. In addition, the berthing of the soil carrier becomes easier, and the time required for berthing can be shortened, so that the dredging work efficiency is improved.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. [Mud-raising conveying device (No. 1)] In the first embodiment of the dredging device according to the present invention, as shown in FIGS.
The dredging device is configured to include a vertical screw conveyor 22 having a main screw 22b in a vertical cylindrical cylinder 21 and a mud lifting conveyor 20 provided with an auxiliary screw body 25.

The vertical screw conveyor 22 includes a main screw 22b in a vertical cylindrical cylinder 21 disposed on a floating body 10 as shown in FIGS.
Is configured to be rotatably driven by a driving motor 22m.

The auxiliary screw body 25 is a main screw.
Square screw-shaped auxiliary screw 25 of the same pitch meshing with 22b
The main screw shaft 22a and the auxiliary screw shaft 25a are provided at the lower end side of the main screw 22b such that the blades of the main screw 22b and the blades of the auxiliary screw 25b overlap and mesh with each other. And the auxiliary screw 25b is rotated at the same rotation speed in the direction opposite to the rotation direction of the main screw 22b.

According to this configuration, the square screw-shaped auxiliary screw having the same pitch meshes with the main screw rotates in reverse with the rotation of the main screw, so that the blade of the square screw-shaped auxiliary screw becomes the blade of the main screw. The upper soil can be scraped up to prevent high viscosity soil from sticking.

Further, the earth and sand sent between the pitch of the main screw and the cylindrical cylinder can be pushed up by the auxiliary screw having a square screw shape inserted between the pitches of the main screw and pressurized from below. Low viscosity clay can be prevented from leaking and falling.

Accordingly, the auxiliary screw 25b attached to the lower end side of the main screw 22b can feed the dredged and oozed mud to the main screw 22b and push it up to assist the mud rising by the main screw 22b. It can be efficiently transported onto the barge 10 with a high mud content.

The function of the auxiliary screw body 25 is, as shown in the schematic diagram of FIG. 4, when the blades of the main screw 22b are linearly developed and drawn. The road is cut off at every pitch, and the cut-off position, that is, the engagement position C rises with rotation and moves to the discharge port side, and as a result, the earth and sand (including sludge, sludge, soft mud, etc.) is pushed up. it can. [Mud-raising transport device (No. 2)] In the second embodiment of the dredging device according to the present invention, the dredging device is mounted in a cylindrical cylinder 21 in the vertical direction as shown in FIGS. Mud raising comprising a vertical screw conveyor 22 having a main screw 22b, a closed casing 26 provided at a lower end of the vertical screw conveyor 22 and a vane pump 27 provided at an opening of the closed casing 26. It has a transport device 20A.

An example of the vane pump 27 is shown in FIG. In the vane pump 27, a rotor 27b is rotatably supported inside a cam ring 27a, and a blade 27c is disposed on the rotor 27b so as to be able to protrude and retract in a radially cut groove. 27a
And moves along with the inner peripheral surface. This roller 27
With the movement of b, the volume of the space surrounded by the cam ring 27a, the rollers 27b and the rollers 27b expands and contracts,
Suction port 27d and discharge port 27e provided in side plate and cam ring 27a
To suck and discharge the earth and sand again.

The closed casing 26 is provided with a main screw 22b.
The vane pump 27 is provided in this opening, and the dredged earth and sand and the soft mud outside the closed casing 26 are sucked from the suction portion 27d of the vane pump 27. And pressurized to feed the main screw 22b of the vertical screw conveyor 22.

With this configuration, the soil during dredging can be confined in the casing 26 and the mud can be raised by the vertical screw conveyor 22, so that the pollution of the surrounding water area due to the outflow of the sand and the surrounding water can be prevented. Can be prevented from lowering the mud content by inhalation. Further, the earth and sand outside the closed casing 26 is pressure-fed to the vertical screw conveyor 22 by the vane pump 27 to increase the pressure in the closed casing 26 and pressurize the cylindrical cylinder 21 from below. By pushing up the earth and sand between the pitches of the 22b and preventing burrs and preventing the earth and sand from leaking and descending from between the cylindrical cylinder 21 and the main screw, mud raising by the main screw 22b can be assisted efficiently. In addition, the efficiency of dredging can be improved by increasing the mud lifting efficiency.

[Throughing device (No. 3)] Further, in the third embodiment of the dredging device according to the present invention, the dredging device is the same as the sludge transferring device 20 of the first embodiment. A vertical screw transport having a main screw 22b in an up-down cylindrical cylinder 21 is constituted by having a mud transport apparatus (not shown) in which the mud transport apparatus 20A of the second embodiment is combined. Machine 22 and the main screw attached to it
Auxiliary screw body of the same pitch of square screw meshing with 22b
25, a closed casing 26 provided at a lower end of the vertical screw transfer device 22, and a vane pump 27 provided at an opening of the closed casing 26.

With this configuration, the soil during dredging can be confined in the casing 26 and the mud can be raised by the vertical screw conveyor 22. Therefore, the pollution of the surrounding water area due to the outflow of the soil can be prevented. Thus, the earth and sand can be pressure-fed to the vertical screw conveyor 22.
Since pressure is applied from the lower side, and further, mud lifting by the main screw 22b can be assisted by the auxiliary screw 25b, dredged soil can be efficiently conveyed onto the dredging barge 10 with a high mud content.

[Intake device] In addition, the above-mentioned mud raising and conveying device 2
The lower ends of 0 and 20A are configured as follows. As shown in FIG. 1, FIG. 5, FIG. 7, and FIG. 8, the intake devices 30 and 30 are inserted into the suction port at the lower end of the main screw 22b of the mud lifting and conveying devices 20 and 20A.
A, 30B are attached, and this intake device 30, 30
A and 30B are open at the bottom in FIGS. 1 and 5, and casings 31 and 31A having a bottom plate 31Ab at the bottom in FIGS.
It is formed having 31B.

The casings 31, 31A, 31B are provided with a front opening 32a and a rear opening 32b which can be opened and closed in two front and rear directions, and a foreign matter removing member is provided inside each of the openings 32a, 32b.
An anti-sinking plate 35 is provided to extend horizontally in the left-right (YY ′) direction.

The front opening 32a and the rear opening 32b are moved up and down by a door opening / closing cylinder 32s.
A door 32c is provided which opens and closes using a guide groove 32g provided at the end of 31 as a guide. The door 32c is formed so as to be opened and closed in addition to the vertical sliding method, a left and right opening and closing method as shown in FIGS. 10A and 10B, and a flip-up method as shown in FIG. You can also.

As shown in FIG. 11 (a), the shape of the casing main body is not limited to a square shape, but also has a truncated pyramid shape in which the openings 32a and 32b are enlarged and the mud raising and conveying device 20 is narrowed. It can also be formed in a mold shape or in such a manner that the openings 32a and 32b sides as shown in FIG. In this case, according to the state of the water bottom B, the opening
Since the sizes of 32a and 32b can be changed, the efficiency of the dredging operation can be increased.

The foreign material removing member 34 is a foreign material intrusion prevention fence formed in a lattice shape. The foreign material removing member 34 is configured to wind foreign matter and hard earth and sand lumps at the bottom of the water into the vertical screw conveyor 22, the auxiliary screw body 25, and the vane pump 27. It has a function of removing foreign matter so that these functions do not stop or be damaged.

The ooze fluidizer 33 is a cutter drum or the like in which a horizontally provided rotating shaft 33a driven by a motor 33m is provided with a blade 33b for disintegrating and fluidizing the sediment that has been deposited and tightened. It is formed.

The blades 33b, which are fluidizing wings, have flat tooth-shaped blades 33b as shown in FIG. 9A, saw-tooth-shaped blades 33Bb as shown in FIG.
9 (c) and 9 (d), a combination of a blade 33Db for releasing the soil and a blade 33Dc for releasing the soil to the rear as shown in FIG. 9 (e), or the like. Constitute.

Further, the shaft diameter, size, number of shafts, arrangement and the like of the blades 33b are also changed according to the soil properties as shown in FIGS. That is, when the blade is soft, the blade is large, and when the blade is hard, the blade is small. The balance with the driving torque is optimized to cut and fluidize the earth and sand.

The positional relationship between the foreign matter removing member 34 and the soft mud fluidizing device 33 depends on the shape and properties of the foreign matter assumed on the water bottom. In this case, the foreign matter removing member 34 is provided in front of the ooze fluidizer 33, and if there is no possibility of breakage of the ooze fluidizer 33, the back of the ooze fluidizer 33, that is, the main screw 22 An arrangement such as providing the foreign matter removing member 34 between them is possible.

The anti-sinking plate 35 has a function of preventing the intake device 30 from sinking too much to prevent dredging even if the dredging surface S is soft ground. Since 35 is placed on the dredging surface S to support the load of the intake device 30, the intake device 30 can be prevented from sinking further. Since it can be kept constant, the finishing accuracy of dredging can be increased.

During the dredging, the intake device 30 opens one of the front opening 32a and the rear opening 32b, that is, the front side in the direction of dredging, and closes the other, that is, the rear side in the direction of dredging. Then, the blades 33b of the ooze fluidizer 33 are rotated to cut and fluidize the earth and sand in the dredged portion, and are fed into the inlet of the main screw 22 through the foreign matter removing member 34 in the casing 31.

Then, earth and sand are cut off at the openings 32 a and 32 b of the casing 31 of the intake device 30, and the amount of mud suction is set so as to supply the soft mud from the ooze fluidizing device 33 housed therein to the mud rising and conveying device 20. Mud raising transport device to balance the amount of mud transported
By adjusting the dredging movement speed or the screw blade rotation speed of 20, it is possible to prevent the fluidized earth and sand from flowing out of the casing 31 and polluting the surrounding water area.

With the above-described structure of the intake devices 30 and 30A, the bottom portions are sealed with the dredging surface S and the bottom plate 31Ab of the casings 31 and 31A, and the box-shaped casings 31 and 31A having openings 32a and 32b only in the dredging direction. Since the cylindrical cylinder casing 21 equipped with the vertical main screw 22b is connected, the sediment that has been softened and fluidized in the box-shaped casings 31 and 31A is sucked as the intake devices 30 and 30A move. Since mud is formed, mud can be raised with a high mud content. In addition, the outflow of fluidized earth and sand to the outside can be suppressed by the box-shaped casings 31 and 31A, so that pollution to the surrounding water area can be prevented.

Further, a front opening 32a and a rear opening 32b which can be opened and closed are respectively provided at front and rear positions of the casings 31 and 31A, and when dredging, one of the traveling directions is opened and the other is closed, so that dredging is performed. The transport devices 20, 20 can be used in the front-rear direction as they are, and the dredging work at the time of reciprocation can be easily performed, so that the efficiency of the dredging work can be improved.

Further, the solidified soil and sludge that have been deposited are softened and fluidized by the softened fluidizers 33 and 33A provided inside the openings 32a and 32b, and the vertical screw conveyor 22 is used.
And the foreign matter can be eliminated by the foreign matter removing device 34, so that clogging and failure of the vertical screw conveyor 22, the auxiliary screw body 25, the vane pump 27, etc. can be prevented, and the transfer efficiency can be improved. [Boat (floating body)] and
In addition, the floating body on which the above-mentioned mud lifting conveyance device is arranged is configured as follows. The barge 10 which is a large floating body is shown in FIGS.
As shown in FIG. 14, it is formed in a substantially rectangular frame shape in plan view having an opening 13 in the center.

Then, the outer peripheral portion of the main body of the dredging barge 10
By providing a plurality of vertically movable spuds 12 on the bottom 11 and lowering the spuds 12 on the water bottom B, the floating body 10 is placed on the water bottom B so as not to be shaken or washed away by the influence of waves, winds and tides. Fix for.

Further, a second movable carriage 15 is provided across the substantially rectangular opening 13 in plan view, and a rail provided on the main body 11 side is provided.
It is configured so that it can be moved back and forth (XX ') on wheels 15a on wheels 15b.
An opening 15c is provided, and the first movable carriage 14 is placed across the second opening 15c so that the wheel 14a can move in the left-right (YY ') direction. That is, the second movable vehicle 15 and the first movable vehicle 14 that can be independently moved and controlled in two directions (XX ′ direction and YY ′ direction) intersecting in plan view are provided.

Then, the mud-raising conveying devices 20 and 20A are disposed on the first movable cart 14. The mud lifting conveying device 20, 20A
As shown in FIG. 2 and FIG. 6,
It is supported by two or more support portions 14b spaced vertically.

According to the dredging device using the barge (floating body) having the above configuration, the following effects can be obtained. The dredging barge 10 is fixed with a plurality of spuds 12, and a mud raising transfer device
The 20 and 20A can be moved and dredged by the first and second movable carts 14 and 15 in two directions of front, rear, left and right, so that the intake device 30 at the lower end of the mud lifting and conveying device 20 and 20A, The effect of waves, winds and tides on 30A can be substantially reduced, and the intake device 30,
It can move while controlling the position of 30A accurately.

The barge 10 fixed to the water bottom B
Since the dredging work is performed above, the dredging work can be performed without being largely affected by waves and wind even if the weather and sea conditions become somewhat rough. Therefore, the operable range is expanded as compared with the conventional method, and the operation rate is improved. [Dredging operation] Next, the dredging operation by the dredging apparatus having the above-described configuration will be described.

First, the intake devices 30, 30A at the lower ends of the sludge transporting devices 20, 20A are moved to the dredging place. This movement is performed by towing to a predetermined position where the dredging barge 10 is dredged, lowering the plurality of spuds 12, piercing the tip of the spud 12 into a water bottom B such as a seabed, a riverbed, or a lakebed, thereby forming a dredging boat. The ship 10 is fixed to the water bottom B, and further, the second movable trolley (left-right movable trolley) 15 is step-moved in an intermittent manner to move the mud lifting transport device 20 in a predetermined direction in the left-right (Y-Y ') direction. Position at dredging position.

Next, when dredging in the front (X) direction, the front door 32 on the dredging direction side of the intake devices 30 and 30A is used.
Open the front opening 32a by operating the door opening / closing cylinder 32s and lift the rear door 32c to the door opening / closing cylinder 32.
The piston of s is contracted and lowered to close the rear opening 32b.

Then, the winch 14c is driven to move the first mobile trolley 14 in the forward (X) direction, and the mud lifting transport devices 20, 20 are moved.
The intake devices 30, 30A at the lower end of A are advanced, and the ooze fluidizers 33, 33A are driven. It is made into soft mud, passed through a lattice-shaped foreign matter removing member 34, and sent to the lower end of the vertical screw conveyor 22.

On the other hand, the motor 22m is driven to rotate the main screw shaft 22a and the main screw blade 22b, and the square screw-shaped blade of the auxiliary screw body 25 provided at the lower end is moved between the blades of the main screw 22b. Reverse rotation. And
By pushing up the soft mud by the blade of the auxiliary screw 25b, the mud rising by the blade of the main screw 22b is assisted.

As shown in FIGS. 7 and 8, the blade 33Ab of the cutter drum 33A, which is the fluidizing device for the soft mud, is made lower than the bottom surface of the casing 31A, so that the earth and sand is removed about 10 cm deeper than the bottom plate 31Ab of the casing 31A. By loosening, the vertical movement of the casing 31A can be suppressed.
In addition, while the earth and sand are loosened by the blade 33Ab of the cutter drum 33A and the blade 33Bb of the auxiliary cutter drum 33B,
Since it moves 30A, the earth and sand can well enter the casing 31 and can be efficiently taken into the main screw 22b.

The mud raised soft mud passes from the discharge port 24 of the mud raising conveying device 20, 20 A via a telescopic chute 41, a first conveyor (shift conveyor) 42, a hopper 43 with a trolley, and a second conveyor (fixed conveyor on a floating body) 44. And is transported to the soil carrier (earth carrier) 50.

As a substitute for the first conveyor and the second conveyor, a high-pressure pump, a cylinder pump, a mortar pump, a squeeze pump, an air pressure tank, and the like can be used.

When the first moving vehicle 14 reaches the front end, the second moving vehicle 15 is moved left and right by a lateral movement amount corresponding to one step, and the door 32 of the front opening 32a of the intake device 30 is moved.
c, close the door 32c of the rear opening 32b, and winch
By driving the drive 14c, the first movable carriage 14 is moved in the backward (X ') direction, and the intake device 30 at the lower end of the mud lifting and conveying device 20 is moved backward to perform dredging.

By repeatedly performing the dredging by the continuous movement of the forward movement and the backward movement and the step movement in the left-right direction, the water bottom under the opening 13 of the dredging barge 10 is dredged all over. In this one-step dredging, for example, a depth of about 50 cm to 100 cm is dredged. [Summary of Effects] According to the dredging apparatus having the above-described configuration, the mud content is extremely high, and the mud can be raised efficiently. Also,
Since the dredging position accuracy is high, the water bottom can be dredged with a small number of reciprocations, a highly accurate finished surface can be obtained, and the operation rate is high with respect to weather and sea conditions, so that dredging efficiency can be significantly improved.

Since the surrounding water area is not polluted by the dredged ooze and the area occupied by the dredging can be reduced, the dredging water area is particularly limited, the number of traffic vessels is large, and a short construction period is required. The effect can be maximized by dredging of the route.

[0075]

As described above, according to the dredging device of the present invention, the following effects can be obtained. In the mud raising conveying device, by using a vertical screw conveying machine and providing an auxiliary screw body, the auxiliary screw pushes up the soil and sand sent between the main screw and the cylindrical cylinder and pressurizes to raise mud. In addition to assisting in
The mud can be raised at a high mud content.

Further, in the mud-raising conveying apparatus, a vertical screw conveying machine is used, and a closed casing and a vane pump are provided. Since the soil can be absorbed by the vane pump and pressurized, the mud can be assisted by the main screw and the mud can be efficiently raised with a high mud content, and the efficiency of the dredging work can be increased.

[0077] By using a vertical screw conveyor and providing an auxiliary screw body, a closed casing and a vane pump in the mud lifting conveyor, both of the above effects can be obtained.

Further, at the lower end of the main screw of the mud lifting and conveying device, there is provided an opening and closing front and rear opening, a foreign matter removing member, and an intake device having a fluidized fluidizer. In addition, since the mud and fluidized soil in the box-shaped casing are sucked as it is, the mud can be raised with a high mud content, and the box-shaped casing can suppress the outflow of the fluidized earth and sand to the outside. Therefore, pollution to the surrounding water area can be prevented.

In addition, since these mud raising and conveying devices are arranged on a movable trolley which can move while controlling the position of the floating body fixed by a plurality of spuds in two directions intersecting in plan view, the mud content is high. The dredging position can be moved with high precision, and dredging can be performed with high finishing precision over the water bottom with a small number of reciprocations. In addition, the influence of waves, winds, and tidal currents on the floating body, the mud raising transport device, and the intake device can be substantially reduced, and dredging can be performed at a high operation rate, so that the efficiency of the dredging operation can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a lower portion of a mud lifting transport device and an intake device of a first embodiment of a dredging device according to the present invention.

FIG. 2 is a front sectional view of the mud raising and conveying apparatus of FIG.

FIG. 3 is a side sectional view showing a lower portion of the mud lifting and conveying device of FIG. 1 and an intake device.

FIGS. 4A and 4B are schematic diagrams for explaining the operation of the mud lifting and conveying apparatus of FIG. 1, wherein FIG. 4A is a side sectional view 1 and FIG.

FIG. 5 is a perspective view showing a lower part of a mud lifting conveyance device and an intake device of a second embodiment of the dredging device according to the present invention.

FIG. 6 is a front sectional view showing the mud lifting transport device of FIG. 5;

FIG. 7 is a side view schematically showing a state where dredging is performed by an intake device having one-stage fluidized blades.

FIG. 8 is a side view schematically showing a state where dredging is performed by an intake device having two-stage fluidized blades.

FIGS. 9A and 9B are side views showing examples of the shape of the blade of the fluidizing device, wherein FIG. 9A shows a blade having a flat tooth shape, FIG. 9B shows a blade having a saw-tooth shape, and FIGS. The wings
Indicates a combination of two types of blades.

FIGS. 10A and 10B are schematic partial perspective views showing an opening and closing method of an opening, wherein FIGS. 10A and 10B show a left and right opening and closing method, and FIG. 10C shows a flip-up method.

11A and 11B are schematic perspective views showing the shape of a casing main body, in which other devices are omitted, wherein FIG. 11A shows a truncated pyramid-shaped casing, and FIG. 11B shows a casing whose opening side can be expanded and contracted.

FIG. 12 is a plan view of a barge of the dredging device according to the present invention.

13 is a side sectional view taken along line A-A 'of FIG.

14 is a front sectional view taken along line B-B 'of FIG.

FIG. 15 is a side sectional view showing an example of a vane pump.

[Explanation of symbols]

 10 Barge (Floating body) 11 Outer part 12 Spud 13 Opening 14 First moving trolley 14c Winch 14s Lifting cylinder 15 Second moving trolley 15c Second opening 15d Support rail 20, 20A Mud carrier 21 Cylindrical cylinder 22 Vertical screw conveyor 22a Main screw shaft 22b Main screw blade 22m Driving motor 24 Discharge port 25 Auxiliary screw body 25a Auxiliary screw shaft 25b Auxiliary screw 26 Hermetic casing 27 Vane pump 27d Suction port 28 Lower connection part 30, 30A, 30B Intake Apparatus 31, 31A, 31B Casing 31Ab Bottom plate 32a Front opening 32b Rear opening 32c Door 32g Guide groove 32s Door opening / closing cylinder 33 Ooline fluidizer 34 Foreign matter removing member 35 Submersion prevention plate 41 Telescopic chute 42 First conveyor 43 Bogie Hopper with 44 44 Second conveyor 50 Soil carrier B Water bottom W Water surface S Dredging surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Matsuura 1 Kita, Senshu Airport, Izumisano City, Osaka Kansai International Airport Co., Ltd. (72) Akio Yoshida 547-1, Kosai Minamicho, Takamatsu City, Kagawa Prefecture Construction Co., Ltd. Shikoku Branch (72) Inventor Shigemi Sato 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Engineering Shipbuilding Co., Ltd.

Claims (5)

[Claims] 1. A mud lifting device is disposed on a floating body so as to be movable up and down. The mud raising device supports a main screw in a vertical cylindrical cylinder and has a lower end side of the main screw. The auxiliary screw body having the same pitch in the form of a square screw meshing with the main screw, the blades of the two screws partially overlap each other in plan view, and rotated at the same rotation speed in the direction opposite to the rotation direction of the main screw. A dredging apparatus, wherein the dredged earth and sand is transported onto the floating body. 2. A mud lifting device is disposed on a floating body so as to be able to move up and down. The mud raising device supports a main screw in a vertical cylindrical cylinder and sucks a lower end of the cylindrical cylinder. A hermetic casing having an opening at the mouth is connected and provided, and a vane pump is provided at the opening, and the dredged earth and sand outside the hermetic casing is pumped to the main screw by the vane pump, and the dredged earth and sand is placed on the floating body. A dredge device configured to be transported to a dredging device. 3. A mud lifting transport device is arranged on the floating body so as to be able to move up and down. The mud raising transport device supports a main screw in a vertical cylindrical cylinder and has a lower end side of the main screw. A square screw-shaped auxiliary screw body having the same pitch meshing with the main screw, the blades of both screws partially overlap each other in plan view, and rotate at the same rotation speed in the direction opposite to the rotation direction of the main screw. In addition, a closed casing having an opening is connected to the suction port at the lower end of the cylindrical cylinder, and a vane pump is disposed in the opening, and dredged earth and sand outside the closed casing by the vane pump. The dredging device is configured to transfer the dredged earth and sand onto the floating body by feeding the water to the main screw. 4. In the mud raising and conveying apparatus, a casing having a front opening and a rear opening which can be opened and closed is provided at a lower end portion of the main screw, and at the time of dredging, the front opening and the casing are provided. One of the rear openings is opened and the other is closed, so that the advancing device can proceed to the opened side so that dredging can be performed, and an intake device provided with a foreign matter removing member and an ooze fluidizing device inside the both openings, respectively. The dredging device according to any one of claims 1 to 3, wherein the dredging device is provided. 5. A plurality of spuds which can reach the water bottom are provided on an outer peripheral portion of the floating body, and an opening is provided in a central portion of the floating body, and is independently provided in two directions intersecting in plan view over the opening. A dredging device, comprising: a movable carriage capable of moving and position-controlling the movable body, and the mud carrier device according to any one of claims 1 to 4 disposed on the movable carriage.