JP4664958B2 - Pipeline transfer system and pipeline transfer method - Google Patents

Description

  The present invention relates to a pipeline conveying system and a pipe that continuously and stably conveys a slurry obtained by mixing earth and sand dredged in sediments such as lakes and marshes with water with a predetermined mud content. The present invention relates to a line conveying method.

  In general, the sediment at the bottom of the water dredged in lakes and marshes is loaded and transported on a ship, temporarily placed on land and drained, and then loaded onto a dump truck with a cargo handling machine such as a backhoe. Yes. This land transport means not only requires a plurality of dump trucks, but also has intermittent transport efficiency due to intermittent transport, and also causes impacts on the surrounding environment by raising dust, causing vibration and noise during the operation of the dump truck. There is a problem that cannot be ignored.

Therefore, in recent years, instead of the land transport means, so-called pipeline transport means has been proposed in which a pipeline is laid along the transport path and the earth and sand are continuously transported by the pipeline. This pipeline transport means has the advantage that there is almost no generation of dust, vibration, noise, etc., so the impact on the surrounding environment is negligible, and wear resistance such as high density polyethylene pipe as the pipe material of the pipeline There is an advantage that the life cycle cost can be reduced by using a material having excellent durability, and further, as disclosed in Patent Document 1 described later, if the siphon action is applied to the pipeline transportation, the transportation power can be reduced. There is an advantage that the application range of the pipeline conveying means can be further widened.
JP 2006-241790 A

  By the way, in order to convey the earth and sand by the pipeline conveying means, for example, as disclosed in Patent Document 1, the dredged earth and sand needs to be mixed with water to make slurry (muddy water) so as to be easily conveyed. At that time, it is desirable to set the mud content (volume ratio of earth and sand to the slurry mixture) to about 10%. If the mud content is higher than that, the pipe will be clogged with sand and the transport efficiency will decrease. However, troubles such as difficult transport are likely to occur, and if the mud content is lower than that, there is a problem that the transport efficiency of earth and sand is lowered and it becomes uneconomical. Adjusting the mud content in line conveying means is a very important technical issue.

  The present invention has been made in view of such circumstances, a novel pipeline transport system capable of easily adjusting the mud content, and capable of transporting earth and sand continuously, stably and efficiently, and An object is to provide a pipeline conveying method.

In order to achieve the above object, the invention according to claim 1 is a pipeline transport system in which a slurry obtained by stirring and mixing earth and sand is transported by a pipeline laid along a transport path.
A hopper disposed upstream of the pipeline, containing sewage and sand, a fixed amount feeder disposed at a discharge port of the hopper, and quantitatively transporting the discharged sewage from the hopper, and a water tank body The main part is submerged, and in the cylindrical stirring chamber of the tank body, a suction port that communicates in the tangential direction and is always open to the water and at the bottom of the tank body generates suction. an outlet for the water flowing in a swirling flow from the water guide openings, and stirred water bath and sediment stirring and mixing to produce a slurry of a given含泥rate to be introduced from the quantitative transport feeder, the agitation Te communicating connection to the outlet of the water tank, and a slurry of a predetermined含泥rate discharged from the outlet suction, characterized in that it comprises a pipeline for transporting.

  In order to achieve the above object, a second aspect of the present invention is characterized in that, in the first aspect of the present invention, a screen for removing dust is provided at the inlet of the hopper.

  In order to achieve the above object, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the fixed-quantity transport feeder includes a casing having an open top surface, a screw conveyor disposed in the casing, and the screw conveyor. And a motor that rotationally drives the earth and sand, and is characterized in that the soil and sand are continuously conveyed quantitatively.

  In order to achieve the above object, the invention according to claim 4 is the invention according to claim 1, 2 or 3, wherein the agitating water tank in which the main part is submerged has a water inlet in the upper part thereof and a water inlet in the lower part thereof. The outlet is opened and a cylindrical stirring chamber is formed therein, and the water inlet is provided with a water guide pipe directed in the tangential direction of the cylindrical side surface of the stirring chamber, and the inlet of the water guide pipe is opened to the water. The outlet is opened in the stirring chamber along the cylindrical inner peripheral surface.

In order to achieve the above object, the invention of claim 5 is a pipeline transfer method using the pipeline transfer system according to any one of claims 1 to 4,
The earth and sand are dropped and accommodated in the hopper, the discharged earth and sand discharged from the hopper are continuously quantitatively conveyed by the quantitative conveyance feeder, and the discharged earth and sand are dropped from the feeder into the stirring water tank. , its dropping sediment flows into the stirred water bath through submerged has been water guide port opening into water, and the water flowing so its internal always swirling flow mixing, stirring, is adjusted to a predetermined含泥rate The slurry is guided to a connected pipeline connected to the outlet of the stirred water tank, and sucked and conveyed.

  According to the first aspect of the present invention, in the pipeline transport system in which the slurry obtained by stirring and mixing the sand and water is transported by the pipeline laid along the transport path, the volume ratio of the sand to the slurry mixture, that is, The slurry content can be easily adjusted to a desired value, and the slurry can be conveyed stably and continuously efficiently.

  In addition, according to the invention of claim 2, before putting the earth and sand into the hopper, it is possible to automatically remove the coarse dust mixed in the earth and sand in advance, it is possible to save the trouble of removing the coarse dust, In addition, smooth continuous conveyance of earth and sand is guaranteed.

  Furthermore, according to the invention of claim 3, the quantitative conveyance of earth and sand can be performed stably and continuously efficiently.

  Furthermore, according to the invention of claim 4, the slurry having a predetermined mud content can be stably and continuously generated by stirring and mixing the earth and water, and the pipe transportation of the slurry can be carried out smoothly and accurately. Can be done.

  Furthermore, according to the invention of claim 5, in the pipeline conveying method in which the slurry obtained by stirring and mixing the earth and sand and the pipeline laid along the conveying path is conveyed, the slurry has a predetermined mud content. Therefore, the slurry can be pipelined stably and continuously and efficiently.

  Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

  In the accompanying drawings, FIG. 1 is an overall side view of a pipeline transfer system, FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1, FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. FIG. 5 is a perspective view of the hopper, FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. 2, FIG. 6 is a perspective view of the stirring water tank, and FIG. 7 is a sectional view taken along line 7-7 in FIG.

  The pipeline conveyance system according to the present invention is a method for mixing soil and sand dredged by dredging work performed in a lake where river water flows in a mountainous region with water to mix rivers and seas downstream from the lake. Used to transport to the final discharge position.

  And this pipeline conveyance system is provided with the hopper H, the fixed quantity conveyance feeder F, the stirring water tank C, and the pipeline PL which are explained in full detail below.

  In FIGS. 1 and 2, a work table ship S (a non-self-propelled ship, anchored by a mooring line not shown) is anchored on the water surface near the dredged area of the lake. The work table ship S is equipped with the hopper H, the quantitative conveyance feeder F and the agitation water tank C, and further has a backhoe BH as a cargo handling machine.

  On both sides of the work platform ship S, a clay ship is placed. The dredged sand loaded on the work platform ship S is dropped onto a hopper H described later by a backhoe BH.

  The hopper H is mounted at the center of the work table ship S. The structure of the hopper H will be described with reference to FIGS.

  The hopper body 1 of the hopper H includes an upper half 1U having a rectangular tube shape and a lower half 1D having a funnel shape, and a charging port 2 that is inclined in the vertical direction is provided on the upper surface of the upper half 1U. A discharge port 3 is provided at the lower end of the half. The input port 2 is provided with a dust removal screen 4. The dust removal screen 4 is configured by fixing a plurality of screen bars 6 arranged in parallel to each other with a gap in a square frame 5. As shown in FIGS. 3 and 4, coarse dust such as stones and wood that cannot be passed through the dust removal screen 4 contained in the earth and sand introduced into the inlet 2 of the hopper H is separated and removed, and the screen 4 It automatically falls and accumulates outside the hopper H by gravity along the inclined surface.

  In this embodiment, the earth and sand are introduced into the hopper H by the backhoe BH. However, the earth and sand may be introduced into the hopper H by other transport means such as a dump truck and a belt conveyor.

  As shown in FIGS. 1 and 2, the work table ship S is equipped with a quantitative conveyance feeder F for quantitatively conveying the earth and sand accommodated in the hopper H. This fixed quantity conveyance feeder F is comprised by the screw feeder in this Example. The screw feeder extends through the work table ship S in the front-rear direction, and has a bowl-shaped casing 8 with an open upper surface, and runs vertically in the casing 8 and is rotatably supported at both ends of the casing 8. A screw conveyor 9 and a geared motor 10 that rotationally drives the screw conveyor 9 are provided, and are arranged to be inclined upward from the carry-in port 11 toward the carry-out port 12. As shown in FIG. 3, the carry-in port 11 of the screw feeder F is directly below the discharge port 3 of the hopper H and is adapted to receive earth and sand from the hopper H, and as shown in FIG. 5. Moreover, the carry-out port 12 of the screw feeder F is located immediately above the inlet 16 of the stirring water tank C described later. Therefore, according to the driving of the screw feeder F, the contained earth and sand in the hopper H is introduced into the screw feeder F, and is continuously conveyed quantitatively by the screw feeder F and guided to the stirring water tank C. The amount of earth and sand transported is adjusted by rotation control of the geared motor 10.

  In this embodiment, the screw feeder F is employed as the quantitative conveyance feeder, but instead of this, other conventionally known quantitative conveyance feeders such as a belt conveyor may be used.

  As shown in FIGS. 1 and 2, the agitation water tank C is suspended and supported at the front portion of the work platform ship S. The water tank body 15 of the stirring water tank C is composed of an upper half 15U having a hollow cylindrical shape with an open upper surface and a funnel-shaped lower half 15D. An inlet 16 is provided on the upper surface, and an outlet 17 is provided on the lower part. . As shown in FIG. 5, the main part of the tank body 15 of the stirring tank C is submerged under the surface of the lake. As shown in FIGS. 5 to 7, a cylindrical stirring chamber 20 is formed in the upper half of the water tank body 15, and the cylindrical side surface of the stirring chamber 20 has a substantially equal interval in the circumferential direction. A plurality of water inlets 18, 18 are opened in the horizontal direction, and water pipes 19, 19 directed in the tangential direction of the cylindrical side surface are fixed to these water inlets 18, 18, respectively. , 19 are opened in the opposite direction to the outside, and their outlets are opened in the opposite direction along the inner peripheral surface of the stirring water tank C.

  In this embodiment, the inlets of the water conduits 19 and 19 are made to coincide with the water inlets 18 and 18 formed along the cylindrical side surface of the stirring chamber 20, but project outward from the cylindrical side surface. You may let them.

  The plurality of conduits 19 and 19 are submerged under the surface of the lake. Accordingly, water always flows into the stirring water tank C through the pair of conduit pipes 19 and 19, and the inflowing water flows inside the stirring water tank C along the cylindrical inner side surface as shown by arrows in FIGS. After flowing as a swirl flow, it is discharged from the outlet 17.

  As shown in FIGS. 1 and 2, the outlet 17 of the stirring water tank C is connected to a suction port of a siphon tube 21 that generates a suction force in the stirring water tank C. The siphon tube 21 is a part of the pipeline PL, and is provided in the siphon carrier B that is anchored on the lake. The downstream siphon 21D is connected to the downstream end of the upstream siphon tube 21U. The downstream siphon pipe 21D extends from the siphon carrier B to the downstream side of the lake, extends over the weir D of the lake, and is connected to a water receiving tank V provided at a lower position than the lake. And this siphon pipe | tube 21 can suck | inhale the slurry (mud water) of earth and sand mixed with predetermined | prescribed mud content in the stirring water tank C by a siphon effect | action, and can make it suck | inhalate to the water receiving tank V. The siphon carrier B is provided with a water suction pump 23 via a bypass 22 between the upstream siphon pipe 21U and the downstream siphon 21D, and the siphon pipe 21 is provided with a water suction function. To start siphoning. In the middle of the siphon tube 21, the on / off valves 24 and 25 for interrupting the siphon operation temporarily by interrupting the tube at any time, and adjusting the suction force by the siphon operation by mixing air into the tube 21. And air-mixing means (not shown).

  Since the siphon carrier B is a conventionally known one, its detailed description is omitted.

  Moreover, in the said Example, although provision of the suction force to the slurry swirling in the stirring water tank C is dependent on the siphon action by the siphon tube 21, instead of this, a suction pump is provided in the pipeline PL, Thereby, a suction force may be applied to the slurry swirling in the stirring water tank C.

  The water receiving tank V temporarily stores the slurry flowing down from the siphon pipe 21 by the siphon action and allows the slurry to be discharged to the downstream side. The water receiving tank main body 27 is installed on the ground via the gutter 28. The upper surface is opened, the inlet 29 is opened at the top, and the outlet 30 is opened at the funnel-shaped bottom. The water receiving tank V may be provided with opening / closing valves at the inlet 29 and the outlet 30 as necessary.

  An upstream end of a transport pipe 32 that constitutes another part of the pipeline PL is connected to the discharge port 30 of the water receiving tank V. The transport pipe 32 is disposed along the transport path under the lake, and the slurry flowing through the transport pipe 32 is naturally dropped by its own weight.

  The downstream end of the transport pipe 32 faces the sand basin R. The sand basin R is installed on the ground and receives a mixture of sediment and water, that is, a slurry, which has flowed down through the conveying pipe 32, that is, a plurality of sedimentation tanks 33, 34, which sediment the sediment in the slurry. 35, the supernatant water in the slurry sequentially accommodated in the settling tanks 33, 34, 35 is sequentially overflowed, and the supernatant water is finally discharged into the river, the sea, etc. Release.

  In addition, the said sand basin R is a conventionally well-known thing, The detailed description is abbreviate | omitted.

  Next, the operation of this embodiment will be described.

  (1) The dredged sand that has been transported by a ship is put into the hopper H by the backhoe BH. At this time, coarse dust such as stone and wood is removed by the dust removal screen 4 provided at the insertion port 2 of the hopper H and automatically accumulated outside the hopper H. Thereby, the trouble of removing coarse dust is saved, and the continuous supply of earth and sand to the hopper H is not impaired.

  (2) The soil contained in the hopper H is carried into the carry-in port 11 of the screw feeder F through the discharge port 3. By the drive of the screw feeder F, the earth and sand carried therein are continuously conveyed in a constant amount and put into the stirring water tank C.

  (3) Since the water inlets 18 and 18 of the agitation water tank C are submerged, the water of the lake is constantly flowing into the agitation water tank C through the water transmission pipes 19 and 19. Since the inner surface of the stirring water tank C is oriented in the tangential direction, the introduced water continuously flows in the stirring water tank C as a swirling flow. In the agitation water tank C, a fixed amount of charged sediment and the continuously swirling inflow water are agitated and mixed into a slurry, and this slurry continuously flows in the agitation water tank C by the suction force of the siphon officer 21. Then, the pipe 17 is sucked into the pipeline PL, that is, the siphon pipe 21 from the outlet 17 thereof. By the way, by adjusting the rotation of the screw feeder F, the amount of soil that is continuously supplied to the stirring water tank C is adjusted, so that the mixing ratio of the sand and water of the slurry swirling in the stirring water tank C, that is, including the water content is included. It becomes possible to set the mud ratio to about 10%, and thereby the sediment can be efficiently and continuously conveyed without causing troubles such as sediment clogging in the pipes of the pipeline PL.

  (4) Slurry discharged from the outlet 17 of the agitation tank C is sucked into the siphon pipe 21 which is the upstream pipeline PL, and once stored in the water receiving tank V, the transport pipe 32 which is the downstream pipeline PL. And flows down naturally in the conveying pipe 32 due to gravity.

  In addition, if opening / closing valves are provided at the inlet 29 and the outlet 30 of the water receiving tank V, it is possible to adjust the amount of inflow and outflow of muddy water into the water receiving tank V by adjusting the opening of these valves.

  (5) The slurry discharged from the water receiving tank V naturally flows down in the transport pipe 32 constituting the pipeline PL and flows into the sand settling basin R, where the sediment in the slurry is stepped and removed in stages. The supernatant water that overflows from the sand basin R is discharged into the river and the sea, which are the final discharge locations.

  As described above, according to this embodiment, the crushed earth and sand are stably and continuously efficiently conveyed as a slurry adjusted to a predetermined mud content to a final discharge place. Can do.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

  For example, in the above-described embodiment, the case where the present invention is applied to pipeline transportation of dredged earth and sand has been described. However, the present invention can also be applied to pipeline transportation of other earth and sand, for example, earth and sand collected in mountainous areas. it can.

Overall side view of pipeline transfer system 2 arrow view of FIG. Enlarged cross-sectional view along line 3-3 in FIG. Hopper perspective view Enlarged sectional view taken along line 5-5 in FIG. Perspective view of a stirred water tank Sectional view along line 7-7 in FIG.

2 ... Input port 3 ... Discharge port 4 ... Dust removal screen 8 ... Casing 9 ... Screw conveyor 10 ... Motor (geared motor)
DESCRIPTION OF SYMBOLS 15 ... Water tank main body 17 ... Outlet 18 ... Water introduction port 20 ... Stirring chamber H ... Hopper F ... Fixed quantity conveyance feeder (screw feeder)
C ... Stirred water tank PL ... Pipeline

Claims (5)

In a pipeline conveyance system in which slurry obtained by stirring and mixing earth and sand and water is conveyed by a pipeline laid along a conveyance path,
A hopper (H) disposed on the upstream side of the pipeline (PL) and containing earth and sand;
A quantitative conveyance feeder (F) that is disposed at the discharge port (3) of the hopper (H) and quantitatively conveys the discharged soil from the hopper (H);
A main body portion is submerged with a water tank main body (15), and is guided into the cylindrical stirring chamber (20) of the water tank main body (15) so as to be directed in the tangential direction and always open to the water. Mizuguchi (18), the lower portion of the tank body (15), and water with an outlet (17), flows becomes swirling flow from the water guide opening (18) for generating a suction force therein, wherein the quantitative transport An agitation water tank (C) for producing a slurry having a predetermined mud content by stirring and mixing the earth and sand introduced from the feeder (F);
Communicatively connected to the outlet (17) of the stirring water tank (C), a slurry of predetermined含泥rate discharged from the outlet (17) suction, and the pipeline (PL) for transporting,
A pipeline conveying system comprising:   2. The pipeline transfer system according to claim 1, wherein a dust removal screen (4) is provided at the inlet (2) of the hopper (H).   The quantitative conveyance feeder (F) includes a casing (8) having an open top surface, a screw conveyor (9) disposed in the casing (8), and a motor (10) for rotationally driving the screw conveyor (9). The pipeline conveyance system according to claim 1 or 2, wherein the soil is continuously and quantitatively conveyed.   The stirring water tank (C) in which the main portion is submerged has a water inlet (18) submerged in the upper part thereof, an outlet (17) opened in the lower part thereof, and a cylindrical stirring chamber (20) therein. The water inlet (18) is provided with a water conduit (19) directed in the tangential direction of the cylindrical side surface of the stirring chamber (20), and the inlet of the water conduit (19) is opened to the water. 4. The pipeline transfer system according to claim 1, wherein the outlet is opened in the stirring chamber (20) along the cylindrical inner peripheral surface. A pipeline transfer method using the pipeline transfer system according to any one of claims 1 to 4,
The earth and sand are dropped and accommodated in the hopper (H), and the discharged earth and sand discharged from the hopper (H) are continuously quantitatively conveyed by the quantitative conveyance feeder (F), and the discharged earth and sand from the feeder (F) are discharged. Into the stirred water tank (C), and flows into the stirred water tank (C) through the dropped earth and the water inlet (18) that is submerged and opened to the water in the stirred water tank (C). Is mixed with water flowing in a constantly swirling flow , stirred, and a slurry adjusted to a predetermined mud content is pipelined from a siphon pipe (21) connected to the outlet (17) of the stirring water tank (C). Pipeline transport method that guides to (PL), sucks and transports

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