JPH0577814B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a dredging device that dredges deposits such as sludge while traveling on soft ground and pumps it to a remote location via a sludge pipe. be.

[Background of the invention]

In general, when dredging sludge and other underwater sediments, it is possible to shorten the construction period by increasing the amount of sludge dredged per unit time, or to reduce the water content of the dredged sludge and reduce the amount of sludge that is dumped at a planned landfill site. In recent years, there has been a demand for faster drying and faster solidification of the ground in landfills.

In order to satisfy these demands, dredging equipment has been proposed in which dredged mud is pumped from a dredging location to land or the like via a mud pipe using compressed air. Figure 9 shows an example of such dredging equipment. This dredging equipment is suitable for dredging in inland areas such as small and medium-sized rivers, canals, reservoirs, and lakes. It consists of a backhoe 3 that excavates the soil, a mud sorting unit 4 that sorts and crushes the excavated sludge and the like into a pudding-like fluid, and a pair of mud pumping tanks 5a and 5b that alternately store and pump the sludge. A power unit consisting of a mud pumping tank unit 5, a belt conveyor 6 that transports the sludge discharged from the mud sorting and crushing unit 4 to the mud pumping tank unit 5, an air compressor 7a, a generator 7b, and an air receiver tank 7c. A mud feeding pipe 8 is connected to the mud pumping tank unit 5.

Sediments such as sludge excavated by the backhoe 3 are fed into the sorter 9 of the mud sorting and crushing unit 4, where large lumps of sediment, empty cans, fishing nets, etc. are sorted out by the screen 9a. It is transported into a rotating drum cage 10a of a trommel type crusher 10 following the sorter 9. The mud is transported through the mud pipe 8 using compressed air.
Since the inside of the rotating drum cage 10a is pumped, if it lacks fluidity, pipe clogging is likely to occur on the way.
After being crushed into a pudding-like fluid by
The mud is alternately dropped and stored in each of the mud pumping tanks 5a and 5b from above the mud pumping tank unit 5 by the belt conveyor 6. When the mud is fully stored in one of the mud pumping tanks 5a, compressed air is supplied into the mud pumping tank 5a to forcefully transport the mud to a remote location via the mud feeding pipe 8. Mud is stored in the other mud pressure feeding tank 5b.

By the way, since such dredging equipment continuously pumps mud by the mud pumping tank unit 5, it has a high processing capacity for dredged mud, and moreover, the mud is pumped by compressed air. Although this method has the advantage of being able to significantly reduce the moisture content in the transported mud, several drawbacks have been pointed out.

One of them is that if the water bottom is very shallow or if the entire dredging area is on soft ground such as a tidal flat, barge 1 cannot be moved, and dredging is limited to areas with a certain degree of water depth. It is a point.

Another difficulty is that the barge 1 lacks maneuverability in relatively narrow rivers, both because it is large and because the barge 1 cannot move on its own.

[Purpose of the invention]

The present invention was made to solve these problems, and it is possible to perform dredging work on soft ground.
Moreover, it is small and maneuverable, and can efficiently dredge sediment such as sludge and pump it to land, etc.
The object of the present invention is to provide a dredging device in which mud is not caused to backflow due to compressed air for pressure feeding.

[Summary of the Invention] The dredging device of the present invention has a self-propelled floater installed in front of a self-propelled floater in which a pair of rigid floating blocks facing each other and integrally connected are provided with an endless track that can freely rotate along the circumferential direction. An excavator for excavating mud is installed in the rear part, and a mud pumping unit is installed in the rear part, into which the mud excavated by the excavator is input and the mud is pumped to the connected mud pipe. In a dredging device equipped with a drive unit for driving the mud pumping unit, the mud pumping unit includes a hopper having a lattice-like screen in the upper opening for charging mud, and a dredging device that transports the mud falling from the hopper to the self-propelled floater. A screw conveyor arranged substantially horizontally for conveying the mud toward the rear, and an air nozzle connected between the conveying end of the screw conveyor and the mud feeding pipe to supply compressed air for pumping the mud inside. The present invention is characterized in that a check valve is provided at the conveying end of the screw conveyor to prevent backflow of the transported mud in the screw conveyor due to the compressed air in the screw conveyor.

[Embodiments of the invention]

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a side view showing one embodiment of the dredging device according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a front view of FIG. 1, FIG. 4 is a rear view of FIG. 1, and FIG. The figure shows a sectional view taken along line A--A in FIG. 2, and FIG. 6 shows a view taken along line B--B in FIG.

In the figure, reference numeral 20 denotes a self-propelled floater, in which a pair of rigid floating blocks 21, 21 facing each other are connected to each other (four in this example) provided at appropriate intervals along the length direction. Each rigid floating body block 2 is integrally connected via a pipe 22.
Endless tracks 23, 23 are rotatably mounted on the outer circumferential surfaces of 1, 21, respectively. Rigid floating block 21
The structure is such that even if a crack or the like occurs between the plurality of watertight compartments, the water ingress can be kept to a limit.The thrust roller 24 of the edge cutting endless track 23 is fitted in the center of the outer peripheral surface in the width direction. A thrust guide rail 25 having a U-shaped cross section is provided to restrict movement of the endless track 23 in the width direction and guide rotation of the rigid floating block 21 in the circumferential direction. Track rail 2 on which the track rollers 26 of 23 come into contact to obtain smooth rotation.
7 is provided.

On the other hand, in the endless track 23, a plurality of flat claw plates 29 are fixed at equal intervals in the circumferential direction between a pair of opposing endless chains 28, 28, and a thrust roller 24 and a track roller 26 are attached to the back surface of the claw plates 29.
is attached to the rigid floating block 21.
The endless chains 28, 28 are installed on sprockets 30 provided on both sides of the front and rear parts, respectively. The front sprocket 30 provided at the front of the rigid floating body block 21 is a driving sprocket, and includes a transmission sprocket 30b attached to its rotating shaft 30a, and a transmission sprocket 30b attached to the inner wall 21a of the rigid floating body block 21. A drive hydraulic motor 31 with a speed reducer is connected via a drive chain 32, and the rotation is controlled by hydraulic pressure from a hydraulic unit of an excavator, which will be described later, and is connected to this hydraulic motor 31, and the endless track 23 is clockwise controlled. The self-propelled floater 20 is rotated in both the clockwise and counterclockwise directions.
It is designed to move forward and backward and turn left and right.

Therefore, in this self-propelled floater 20, since the pair of rigid floating blocks 21, 21 are integrally connected via the connecting pipe 22, the floater 2
The overall ground pressure is low, making it possible to run stably not only on water but also on muddy, soft ground.

33 is the connecting pipe 2 of the self-propelled floater 20
With an excavator removably attached to 2,22,
An excavation bucket 34a is attached to the tip of the multi-jointed arm 34.
The excavator main body 35 to which the excavator is attached can pivot horizontally. Furthermore, this excavator 33
The self-propelled floater 20 is driven by a built-in hydraulic unit, and the self-propelled floater 20 travels in the operator's cab of the excavator main body. Reference numeral 36 denotes a horizontal stage for work, which is supported by a support bracket 37 provided on opposite sides of the pair of rigid floating blocks 21 and located above the rigid floating blocks 21, 21, and is provided at the rear of the excavator 33. It is being
This horizontal stage 36 is provided with a power unit 38 for driving a mud pumping unit to be described later, and a mud pumping unit 39 is provided at the rear end of the horizontal stage 36. This power unit 38 includes an air compressor (not shown) driven by an engine (not shown) as a power source, and an air receiver unit (not shown) that stores compressed air from the air compressor. , a generator (not shown) driven by the engine, and a speed reducer 40 that reduces the power from the engine to drive the screw conveyor of the mud pumping unit 39. Reference numeral 41 denotes a spat which is provided at the front and back of the outside of the rigid floating body block 21 so as to be able to rise and fall freely.When the self-propelled floater 20 performs dredging work while floating on the water surface, it is driven into the underwater ground and the self-propelled floater 20 is moved up and down. The floater 20 can be fixed.

The mud pumping unit 39 includes a hopper section 42 into which mud excavated by the bucket 34a of the excavator 33 is poured, and a pumping section that continuously pumps the mud from the hopper section 42 to the mud feeding pipe 43. 44. The hopper section 42 includes a hopper 45 whose upper opening is inclined to the left side of the floater 20, and a grid-like screen 46 provided at the upper opening of the hopper 45 via a plurality of vibration generators (not shown). The screen 46 is provided with a shutter 47 extending from the inclined lower end of the screen 46 to the outside of the left rigid floating body block 21. The mud thrown in from the bucket 34a of the excavator 33 is first crushed into large lumps by the vibrating screen 46 and falls into the hopper 45 through the mesh of the grid. The mesh size of the screen 46 is formed to a size that does not allow empty cans etc. to pass through. Therefore, the mud that falls into the hopper 45 is crushed into a fine piece and has fluidity due to the vibration action of the screen 46, so that it does not cause clogging in the mud feeding pipe 43. . Furthermore, empty cans and the like that cannot pass through the screen 46 slide down on the shutter 47 and are discharged. Note that a garbage receptacle may be provided at the lower end of the slope of the shooter 47 to accommodate the garbage in the excavated deposit.

Next, the pumping section 44 of the mud pumping unit 39 will be explained based on FIGS. 7 and 8.

48 is a horizontally arranged screw conveyor,
Two screw shafts 50 and 51 are arranged in parallel within an elongated casing 49. A rectangular opening 52 is provided at the center of the top of one end of the casing 49.
is provided, and the hopper part 4 is provided in this opening 52.
The lower end openings of the second hoppers 45 are connected. Reference numeral 53 denotes a flat flange plate attached to an opening at one end of the casing 49, and is removably attached to a blind plate of a bearing stand, which will be described later, with bolts and nuts (not shown). 54 is a bearing stand for the screw shafts 50, 51, and a blind plate 56 provided at the front end of a horizontal base plate 55 is connected to the flange plate 53 of the casing 49 to close one end opening of the casing 49. ing. by the way,
When the screw shafts 50, 51 are supported at both ends, the bearing provided on the tip side in the direction of transporting the mud has the disadvantage that the transported mud gets into the bearing and becomes easily damaged, resulting in a lack of durability. Therefore, in this embodiment, a first bearing 57 and a second bearing 58 are provided at the horizontal base plate 55 and blind spot 56 of the bearing base 54, respectively, so that the screw shafts 50 and 51 are cantilever-supported. . Furthermore, since these screw shafts 50 and 51 are cantilever-supported by a bearing stand 54, a strong force such as bending stress is applied to the horizontal base plate 55, blind spot 56, and flange plate 53. It is set up. The bearing stand 54 and the casing 49 are fixed to the floater 20 via these brackets 59 and 60, respectively.

The screw shaft 50 has a spiral fin 50a around a right-hand thread, and the screw shaft 51 has a spiral fin 51a around a left-hand thread.By rotating inwardly facing each other, the screw shaft 50 is fed into the casing 49 from the hopper 45. The muddy soil is continuously conveyed in the direction of the tips of the screw shafts 50 and 51. The rotational drive of these screw shafts 50, 51 is performed by the reduction gear 40 of the power unit 38.
The shaft end of one screw shaft 50 is connected to the output shaft 40a of the screw shaft 50 to rotate this screw shaft 50, and the screw shaft 50 and the other screw shaft 51 are meshed with each other to rotate synchronously.
62 is provided to transmit the rotational drive from one screw shaft 50 to the other screw shaft 51 so that both screw shafts 50, 51 can rotate inwardly facing each other.

On the other hand, a connecting pipe 6 is provided on the distal end side of the casing 49.
A pressure feed pipe 64 is connected through 3, and a mud feed pipe 43 is further connected to the tip of this pressure feed pipe 64.
This pressure feed pipe 64 is provided with a first air nozzle 65 and a second air nozzle 66 for jetting compressed air into the pipe, and is continuously supplied from the screw conveyor 48 via the short pipe 63. The compressed air from the first air nozzle 65 and the second air nozzle 66 continuously pumps the mud into the mud feeding pipe 43. Here, this pressure feed pipe 6
The mud conveyed into the screw conveyor 48
If the transported mud is continuously fed through the screw conveyor 48 in a sufficiently clogged state, the mud is forcibly sent into the pressure feeding pipe 64 by the air pressure inside the pressure feeding pipe 64. There will be no backflow.
However, under such conditions, the mud is constantly pumped into the pipe 64.
In the case of conveyance using a general screw conveyor, the amount of supply is small. Therefore, in this embodiment, a check valve 67 is provided in the pressure feed pipe 64 to prevent the mud from flowing backward in the screw conveyor 48 by the compressed air in the pressure feed pipe 64. As shown in FIG. 8, this check valve 67 has a short tube 68 that forms a valve seat with a downwardly inclined tip opening, and a support shaft 69 provided above the tip opening of the short tube 68 as a fulcrum. The short pipe 6 is swingable and is moved by its own weight.
The screw conveyor 48 includes a flat valve portion 70 arranged to be able to close the tip opening of the screw conveyor 48.
The mud transported by the pump pushes up the valve portion 70 and is supplied into the pressure feed pipe 64. Furthermore, when the amount of mud transported by the screw conveyor 48 decreases, the opening degree of the valve section 70 decreases in accordance with the mud transporting force, and the opening and closing of the valve section 70 is repeated, thereby preventing backflow of mud. be done. A rubber sheet provided on the surface of the valve portion 70 of 71 improves the degree of sealing of the check valve 67.

In the pumping section 44 of the mud pumping unit 39, the opening degree of the check valve 67 is small. In other words, if the mud conveyed by the screw conveyor 48 is not sufficiently packed, the amount of pumped soil will be reduced by that amount and the pumping efficiency will be deteriorated. Pressure feed pipe 64
The connecting pipe 63 that connects the screw conveyor 48 has a constricted pipe shape on the side of the pressure feed pipe 64, so that the transported mud from the screw conveyor 48 is supplied into the pressure feed pipe 64 in a clogged state. In addition, in order to efficiently force the mud in the pressure feed pipe 64 to the mud feed pipe 43, the front portion of the pressure feed pipe 64 is formed into a tube shape that is narrowed toward the mud feed pipe 43, and the first Compressed air from the air nozzle 65 is ejected along the front oblique surface of the pressure feed pipe 64. Furthermore, the second
The air nozzle 66 is inserted to a position forward of the tip opening of the short pipe 68 in order to prevent the compressed air ejected from the nozzle end from affecting the opening/closing operation of the valve portion 70 of the check valve 67. has been done. Therefore, mud is almost continuously supplied into the pressure feed pipe 64, and the compressed air from the first air nozzle 65 and the second air nozzle 66 allows the mud in the pressure feed pipe 64 to be fed without backflow. It will be sent under pressure to a remote location such as land via the mud pipe 43.

〔Effect of the invention〕

As explained above, according to the present invention, when dredging under the water surface or dredging on soft ground is carried out using a self-propelled floater, the dredged mud is substantially continuous without flowing back into the mud pipe from the hopper. This means that it can be sent under pressure to remote locations.

[Brief explanation of drawings]

1 to 8 show an embodiment of the dredging device according to the present invention, FIG. 1 is a side view of the dredging device, and FIG. 2 is a side view of the dredging device.
The figure is a plan view, FIG. 3 is a front view, FIG. 4 is a rear view, FIG. 5 is a sectional view taken along line A-A in FIG. 2, and FIG. 6 is a B-- A view in the direction of arrow B, FIG. 7 is a plan view of the pumping section of the mud pumping unit, and FIG. 8 is a side view thereof. FIG. 9 shows a plan view of a conventional dredging facility. 20: Self-propelled floater, 21: Rigid floating block, 22: Connecting pipe, 23: Endless track, 24:
Thrust roller, 25: Thrust guide rail,
26: Truck crawler, 27: Truck rail,
28: Endless chain, 29: Claw plate, 30: Sprocket, 31: Hydraulic motor, 32: Drive chain, 33: Excavator, 34: Multi-articulated arm, 35:
Excavator body, 36: Horizontal stage, 37: Support bracket, 38: Power unit, 39: Mud pumping unit, 40: Reducer, 41: Spat, 4
2: Hopper part, 43: Sludge feeding pipe, 44: Pressure feeding part,
45: Hopper, 46: Screen, 47: Shooter, 48: Screw conveyor, 49: Casing, 50, 51: Screw shaft, 52: Square opening, 53: Flange plate, 54: Bearing stand, 55:
Horizontal base plate, 56: Blind plate, 57, 58: Bearing, 5
9, 60: Bracket, 61, 62: Gear, 6
3: Connection pipe, 64: Pressure feed pipe, 65, 66: Air nozzle, 67: Check valve, 68: Short pipe, 69: Support shaft,
70: Valve part, 71: Rubber sheet.

Claims (1)

[Scope of Claims] 1. A self-propelled floater for mud excavation is attached to the front part of a self-propelled floater in which a pair of rigid floating blocks facing each other and integrally connected with each other is provided with an endless track rotatable along the circumferential direction thereof. The excavator is equipped with a mud pumping unit at the rear, into which the mud excavated by the excavator is input, and which pumps the mud to the connected mud pipe, and the mud pumping unit is mounted on the self-feeding floater. In the dredging device equipped with a drive unit that drives a hopper, the mud pumping unit includes a hopper having a grid-like screen in the upper opening for mud input, and transports mud falling from the hopper toward the rear of the self-propelled floater. a screw conveyor arranged substantially horizontally, and a pressure feeding pipe connected between the conveying end of the screw conveyor and the mud feeding pipe, and having an air nozzle therein for supplying compressed air for pumping mud. ,
A dredging device characterized in that a check valve is provided at a conveying end of the screw conveyor to prevent backflow of mud conveyed in the screw conveyor due to compressed air in the pressure feeding pipe. 2. The dredging device according to claim 1, wherein the screw conveyor has a screw shaft provided in a casing that is rotatably supported in a cantilever manner at a conveyance base end side thereof.