JPH0820965A - Dredging forced feed device - Google Patents

Abstract

PURPOSE:To dredge hard mud with high efficiency by a method wherein agitating devices are disposed in front of and both sides of a vertical type screw conveyor and a mud collecting plate is arranged to the outside of the mud intake port of a conveyor. CONSTITUTION:A hydraulic motor 217a is driven and agitating blades 218A and 218B of an agitating 216 are rotated to excavate mud. Excavated mud is guided to a mud suction port 214 by a mud collecting plate arranged at the back of the mud suction port 214 of a casing 211. The mud is inputted on a vertical screw conveyor 210 through a mud suction port 214 and transferred upward. Further, mud is pressurized by a pressure pump 220 and conveyed through a discharge pipe 250 by compressed air injected in the discharge pipe 250 through an ejector 260.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dredging pumping device for collecting and transferring mud existing on the bottom of rivers, lakes, harbors and the like.

[0002]

2. Description of the Related Art As shown in FIG. 8, a conventional dredging pressure feeding device 200 comprises a vertical screw conveyor 210 and an inlet device 210X concentrically arranged at the lower end of the vertical screw conveyor 210 and driven to rotate. The dredging device 1 and the pressure-feeding device 100 that pressurizes and pumps the dredged mud. The pressure-feeding device 100 includes the pressurizing pump 220 and the discharge pipe 2.
Ejector 2 for injecting compressed air into 50 and discharge pipe 250
It consisted of 60 etc. and carried mud by air to a distant destination.

[0003]

However, the inlet device 210X in the dredging device of the dredging / pushing device 200 is a horizontal flat plate-like inlet blade 210 that is rotationally driven coaxially with the vertical screw conveyor 210.
Vertical screw conveyor 21 which has Y and cuts a relatively soft mud layer such as sludge and soft mud on the seabed, and fluidizes by stirring and fluidizing.
Although it is effective to take it into the vertical screw conveyor 210 from the mud intake port of 0, in the dredging work for the hardened mud layer with high hardness, the hard mud layer is efficiently excavated, and However, there is a problem that it is impossible to fluidize with stirring, and it is possible to perform only dredging work with low efficiency, which is limited to a very small amount of sampling.

[0004]

[Means for Solving the Problems] By solving the above problems, not only soft mud but also mud with high hardness was continuously excavated and stirred and fluidized to minimize the inflow of seawater. In order to achieve dredging and transfer of high-concentration mud to a distant place, in the present invention, a vertical screw conveyor, a pressure pump connected to the discharge port of the vertical screw conveyor, and a discharge pump following the pressure pump. In a dredging and pressure-feeding device for mud, which is provided with an ejector disposed in the middle of the feed pipe and in the middle of the feed pipe, for feeding compressed air into the discharge pipe, the front and left and right sides of the mud intake at the lower end of the vertical screw conveyor. Is equipped with three agitators that are each driven to rotate around a vertical axis to excavate and stir fluidize the mud, and the agitators horizontally project from the vertical axis and have a plurality of tips bent upward or downward. Of the arm A fixed blade that has a plurality of projections, each of which has a sharp-edged blade-shaped protrusion at substantially equal intervals, is disposed on the side of the blade, and that removes mud solidified in the swirl region of the stirring blade. Along with the arrangement, a vertical flat plate collecting plate for introducing the mud stirred and fluidized by the stirring device to the outside of the mud intake of the vertical screw conveyor is provided. did. Further, in the second invention, the mud collecting plate is further movable forward around the lower end of the vertical screw conveyor around the vertical axis, and the lower end side of the vertical screw conveyor is in the shape of a V in plan view. It is a pair of left and right fixed mud collecting plates.

[0005]

In the present invention, the inlet device is replaced by 3
Two stirrers are arranged in front of and on the left and right of the vertical screw conveyor, respectively, and at the time of the dredging work by the swing movement to the side of the vertical screw conveyor, the front stirrer performs preliminary excavation and stirring of the hard mud layer, The stirrer facing the swing direction was pre-excavated beforehand and subdivided into small pieces to facilitate fluidization.The mud was stirred and fluidized and guided to the mud collecting plate, and a large amount was easily and easily introduced into the vertical screw conveyor from the mud intake port. In addition, it is efficiently taken in and transferred to a distant place by a pressure feeding device below a pressure pump. Since the movable mud collecting plate among the mud collecting plates can change its angle according to the swing direction, it guides the mud stirred and fluidized to the mud intake port very efficiently.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 7 relate to an embodiment of the present invention,
1 is an overall configuration diagram of the dredging pressure feeding device, FIG. 2 is an overall side view of the vertical screw conveyor, FIG. 3 is a side view taken along line AA of FIG. 2, and FIG. 4 is a plan view taken along line BB of FIG. FIG. 5 is a plan view of a mud collecting plate showing another embodiment, FIG. 6 is a plan view of dredging work,
FIG. 7 is a plan view of a mud collecting plate showing another embodiment. As shown in FIG. 1, the dredging pressure feeding device 200 of the present invention is roughly divided into a dredging device 1 including a vertical screw conveyor 210 and a stirring device 216, a pressure pump 220, and a flow meter 23.
0, a check valve 240, a discharge pipe 260, and an ejector 260 having a compressor 262 for supplying compressed air. The dredging device 1 is a stirring device 21 for stirring mud deposited on the seabed, lakebed, riverbed, and the like.
6 is excavated and subdivided, further stirred and fluidized, lifted by a vertical screw conveyor 210, pressurized by a pressurizing pump 220, and then flown through a flow meter 230 and a check valve 240 to a discharge pipe 250. Compressed air supplied from the compressor 262 is blown by the ejector 260 provided in the middle of the discharge pipe 250, and the mud is transported by plug transport (plug transport).

As shown in FIGS. 2 to 4, a vertical screw conveyor 210 according to an embodiment of the present invention includes a vertical cylindrical casing 211, and a screw blade 213 which is concentric with the casing 211 and spirally surrounds the casing. Rotating shaft 2 with
12 is rotatably supported via bearings at the upper and lower ends, and is rotatably driven at a variable speed by a hydraulic motor 212a at the top, and mud taken in from a mud intake port (suction port) 214 that is an opening provided on the lower side surface. It is discharged from the discharge port 215 and transferred to the pressurizing pump 220 for pressurization as described above. The screw rotation speed is variable at 400 to 1200 rpm. Mud suction port (suction port) 214 in the vertical screw conveyor 210
For the purpose of stirring and flowing the mud around it to facilitate and facilitate the transfer to the suction port 214, stirrers 216 are provided at three locations in front of and on the left and right sides of the suction port 214.

The agitating device 216 includes supports 216a, 21 extending horizontally from the upper and lower portions of the casing 211.
A pair of upper and lower stirring blades 218 (218A, 218B) attached to a vertical stirring shaft 217 supported by bearings 217b and 217c disposed at the tip of the hydraulic motor 217a.
It is configured to be rotationally driven at a variable speed via. The stirrer 216 is installed at one front position, and as shown in FIG. 4, two mud intake ports (suction ports) 2 are opened on the left and right sides.
14 are installed facing each other, one on each of the left and right, and a total of three are installed. The stirring blades 218 have a plurality of (four in the example of FIGS. 2 to 4) arms 218a horizontally bent from the stirring shaft 217, and bend the tips of the arms 218a upward or downward at a substantially right angle, and at the outside thereof, a plurality of stirring blades 218a at substantially equal intervals. The protrusion 218b is provided, and the tip of the protrusion 218b is formed into a sharp blade shape. In the type having three stirring devices 216, only the central stirring device 216 is provided with upper and lower stirring blades 218A and 218B, and the left and right stirring devices 216 are provided with only the lower stirring blade 218B. It is used when the material is dredged and transferred at a dredging site having a layer, and is particularly suitable when water pollution due to stirring is disliked. As a matter of course, in such a device for treating mud at the dredging site without fear, the left and right stirring devices 216 may also be provided with a pair of upper and lower stirring blades 218A and 218B. All of the stirring devices 216 shown in FIGS. 2 to 4 are driven to rotate by a hydraulic motor 217a provided at the top, and there is a merit that the rotation direction and the rotation speed can be freely selected independently. is there. On the other hand, as another driving method, the central stirring device 216 among the three stirring devices 216 is set to the hydraulic motor 21.
There is also a type that is driven by 2a, and the stirring devices 216 on both sides are driven by a chain via a sprocket. In this type, the rotation direction and the rotation speed cannot be set independently, but the drive device cost can be reduced. The rotation speed of the stirring shaft 217 of the stirring device 216 is usually 5 to 50 rpm.
The speed is variable and the number of rotations is increased or decreased according to the viscosity of the mud and the water content (water content). The fixed blade 219 is a plate-like member that is fixed and fixed on the support 216b in a space surrounded by the stirring blade (upper) 218A and the stirring blade (lower) 218B, and is fixed in the space. This is to prevent the stagnation of the rice cake in the form of dumplings.

Next, the structure of the mud collecting plate 270 will be described. As shown in FIGS. 3 to 4, the mud collecting plate 270 is formed by a vertical rectangular flat plate behind a mud suction port (suction port) 214 which is symmetrically opened below the casing 211. When the dredging device 1 is moved in the swing direction R and the swing direction L shown in FIG. 4, the function of the mud which is agitated and fluidized by the agitator 216 in the swing upstream direction is released to the surroundings. It smoothly guides everything to the mud suction port (suction port) 214 without scattering.
Compared with the dredging device without the installation of the mud collecting plate 270, the uptake efficiency was improved to 150% to 250%, the mud collecting effect was extremely high, and it became possible to transfer a large amount of dredged mud soil. . The dredging procedure of the dredging area (dredging zone) Z proceeds in a zigzag manner by swinging from the turning center of the dredging ship (the rotation axis of the backhoe or the spud behind the dredging ship), as shown in FIG. 6, for example. FIG. 5 shows another embodiment of the mud collecting plate 270. In addition to the fixed mud collecting plates 270A, 270B on both sides described above, a rotary shaft around a rotation axis vertical to the front of the vertical screw conveyor 210 is shown. The movable mud collecting plate 270C is provided at the center. When the movable mud collecting plate 270C is moved in the swing direction R shown in FIG. 5, the movable mud collecting plate 270C is tilted in the direction shown by the two-dot chain line in the upper part of FIG. Mouth) 214, and in the case of the swing direction L, on the contrary, tilts and fixes like the two-dot chain line below. As described above, by tilting and fixing the movable mud collecting plate 270C depending on the swing direction, the mud collecting effect can be further improved by more than that described above.
It turned out to be improved by ~ 30%. Movable mud plate 270C
Alternatively, the rotary shaft 272 may be extended upward and the lever attached to the upper end may be manually rotated, or it may be rotated via a power means such as an air cylinder. Further, as shown in FIG. 7, a movable shutter 274 that can be moved up and down is formed on the outer circumference of a pair of left and right mud suction ports (suction ports) 214 and is formed by a curved plate that matches the curvature of the casing 211 of the vertical screw conveyor 210. And the movable shutter 274 in the swing advancing direction is raised according to the swing direction L or the swing direction R to raise the mud suction port (suction port) 2
On the other hand, the movable shutter 274 on the rear side in the direction of swing progress is lowered to keep the mud suction port (suction port) 2 open.
When 14 is closed, not only the mud collected by the movable mud collecting plate 270C and the fixed mud collecting plate 270A or 270B can be efficiently collected without being released to the rear, but also water from the rear in the swing direction can be collected. Can be prevented. FIG. 7 shows a state when the vehicle advances in the swing direction L. The state of the two-dot chain line of the movable mud collecting plate 270C shown in FIG. 7 indicates the state during dredging work in the swing direction R, in which the upper movable shutter 274 is raised (opened) and the lower movable shutter 274 is opened. Lower and close.

As described above, in the dredging pressure feeding device 200 of the present invention, three stirring devices 216 of the dredging device 1 are arranged in the front, left and right, and the front stirring device 216 is mainly a hard solid mud layer. The main function is to perform preliminary excavation, and one of the left and right stirring devices 216 and 216 is stirred and fluidized by the stirring device 216 facing the swing direction, and then the mud collecting plate 27
0 (fixed mud collecting plate 270A or 270B and movable mud collecting plate 270C) is transferred from the mud suction port (suction port) 214 by the vertical screw conveyor 210. Further, the stirring device 216 located at the rear of the swing direction smoothes the remaining mud. As described above, the feature of the present invention is that three stirrers 216, which are divided into roles, efficiently excavate hard mud, stir and fluidize it, and can dredge almost all mud efficiently with the mud collecting plate. is there. The soil quality of the symmetrical mud is a solidified viscous layer, fine sand, silt, etc.,
The N value is 4 or less, and the water content ratio in the natural state is equal to or higher than the liquid limit.

Although not shown in FIGS. 1 to 7, when it is necessary to solidify the collected mud at the destination, a solidifying agent adding device may be added to the present device. In this case, the mud is solidified immediately before the pressure pump 220 via piping, an air valve or a check valve in a path connected between the discharge port 215 of the vertical screw conveyor 210 and the pressure pump 220. A solidifying agent silo and a solidifying agent supplying device for supplying and supplying a solidifying agent.The solidifying agent silo contains powder such as cement and cement-based solidifying agent, and the solidifying agent supplying device may be, for example, a rotary feeder or a table feeder. , A feeder such as a piston feeder is used, and a flow meter 2
The drive device is controlled according to the actual flow rate of the mud measured in 30, and the supply amount is adjusted. The solidifying agent may be a powder as it is or a slurry with water added, and the selection is determined by the degree of mixing depending on the soil. However,
Since it is more economical to use the powder as it is, use it as it is if there is no significant difference. When the powder is sent, the pipe may be transferred instead of the flexible screw conveyor. The solidifying agent may be supplied as a powder, but depending on the soil quality, a slurry with water added is desirable in order to uniformly mix it with mud. In the case of slurry-like addition, a storage tank equipped with a mixer (mixing stirrer) is provided in the solidifying agent supply device, and a water supply line is connected thereto to make the solidifying agent in powder form into a slurry, which is then discharged to the piston pump. The solidifying agent is 1 m ³ of soft mud,
Add at a rate of 50-200 kg (usually 100 kg). As another usage of the present invention, as described above, the solidifying agent is introduced into the mud carried in the discharge pipe 250 by air using the negative pressure of the pressure pump 220 immediately before the pressure pump 220. The blades of the pressurizing pump 220 are sufficiently kneaded by the rotation of the blades of the pressure pump 220 to supply the slurry in which the powder or the water is added and mixed in an amount corresponding to the flow rate of the mud, so that the slurry is uniformly mixed with the mud during the plug transportation and can be remote. After reaching the destination of (1), after a certain period of time (usually 2 to 7 days), it solidifies more than necessary strength. That is, the addition amount of the solidifying agent is determined depending on the type of mud soil and how many kgf / cm ² of strength the material should have after a certain number of days. As a matter of course, the larger the added amount, the faster and harder the solidified. Thus, since the uniform mixing of the mud and the solidifying agent is efficiently performed during the plug transportation in the discharge pipe, the length of the discharge pipe 250 is at least 50 m.
Is needed.

[0012]

As described above, in the dredging pressure feeding device of the present invention, even a hard solidified mud can be efficiently and smoothly dredged and transferred in large amounts, so that the dredging efficiency is dramatically improved. In addition, the mud collecting effect is further improved by installing a movable mud collecting plate.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a dredging pressure feeding device according to an embodiment of the present invention.

FIG. 2 is an overall side view of a vertical screw conveyor according to an embodiment of the present invention.

FIG. 3 is a side view taken along the line AA of FIG.

FIG. 4 is a plan view taken along the line BB of FIG.

FIG. 5 is a plan view of a mud collecting plate showing another embodiment of the present invention.

FIG. 6 is an explanatory plan view showing a dredging work procedure according to the embodiment of the present invention.

FIG. 7 is a plan view of a mud collecting plate according to another embodiment of the present invention.

FIG. 8 is an overall configuration diagram of a conventional dredging pressure feeding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dredging device 100 Pressure feeding device 200 Dredging pressure feeding device 210 Vertical screw conveyor 210X Inlet device 210Y Inlet blade 211 Casing 212 Rotating shaft 212a Hydraulic motor 213 Screw blade 214 Suction port 215 Discharging port 216 Stirring device 216a Support 216b Support 216b Support Motor 217b Bearing 217c Bearing 218 Stirring blade 218A Stirring blade (upper) 218B Stirring blade (lower) 218a Arm 218b Protrusion 219 Fixed blade 220 Pressurizing pump 220a Hydraulic motor 230 Flowmeter 240 Check valve 250 Discharge pipe 260 Ejector 262 Compressor 270 Mud collecting plate 270A Fixed mud collecting plate 270B Fixed mud collecting plate 270C Movable mud collecting plate 272 Rotary shaft 274 Movable shutter A Dredging start point B Dredging end Point Z Dredging area (Dredging zone)

Claims (2)

[Claims] 1. A vertical screw conveyor, a pressure pump connected to a discharge port of the vertical screw conveyor, a discharge pipe following the pressure pump, and a discharge pipe disposed in the discharge pipe. In a dredging dredging device for mud equipped with an ejector for feeding compressed air into the mud, the mud is rotatably driven around the vertical axis in front of the mud intake at the lower end of the vertical screw conveyor and on both left and right sides, and the stirring flow is performed. The three stirrers are formed horizontally, and the stirrer is provided with a protrusion having a sharp-edged tip on the outside of a plurality of arms that horizontally project from the vertical axis and have the tips bent upward or downward. A plurality of stirring blades are arranged at substantially equal intervals, and a fixed blade for removing solidified mud is disposed inside the swirling region of the stirring blade, and the mud suctioned by the vertical screw conveyor. Use the stirring device on the outside of the mouth. A dredging pressure-feeding device, characterized in that a vertical flat plate-like mud collecting plate for introducing the fluid which has been stirred and fluidized into the mud intake port is disposed. 2. The mud collecting plate is disposed in front of the lower end of the vertical screw conveyor in the shape of an inverted V in plan view on the lower side of the movable mud collecting plate rotatable around the vertical axis and the lower end of the vertical screw conveyor. The dredging pressure feeding device according to claim 1, which is a pair of left and right fixed mud collecting plates.