JP2004300704A - Construction method and apparatus for removing sediment from bottom of water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method and an apparatus for removing sediment from the bottom of water, which have the function of adjusting the inflow of the sediment so that soil concentration can be set proper, through the use of a natural force, and which enable the sediment to be efficiently removed and discharged in an environment-friendly manner. <P>SOLUTION: A horizontal section 3 of a sediment transfer pipe, wherein a plurality of sediment inflow holes 4 are longitudinally juxtaposed, is buried in sediment 2 accumulated on the bottom of the sea; an intake 7 is positioned underwater so that a water flow 5 for transfer can be led into the horizontal section 3; the sediment 2 is made to flow into the horizontal section 3 from the inflow holes 4; and the water flow 5 is made to flow toward the side of a discharge end 18, so that the sediment flowing into the horizontal section 3 can be transferred toward the discharge end 18 and discharged from the discharged end 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a submarine sediment removal method for removing sediment near the bottom of the water, a submarine sediment removal device, particularly, a seashore sand bypass method (a method of transporting sand from a sand accumulation point to an erosion point), a sea route or a sea route. The present invention relates to a submarine sediment removal method applicable to a sedimentary sediment dredging method and apparatus at a basin and the like, and a submarine sediment removal apparatus.
[0002]
[Prior art]
If sediment accumulates near the bottom of the sea, river, lake, etc., the water depth of the navigation channel and the basin will be shallow, which will hinder the use of ships. For this reason, when the water depth of the channel or the basin becomes shallower than a predetermined value, "dredge", which is an operation of digging out sediment near the water bottom, is performed.
[0003]
However, even if the dredging is performed, the sediment moves from the peripheral portion by a water flow or the like, so that after the dredging, the sediment is again deposited near the water bottom after a lapse of time. For this reason, dredging works are often repeated many times. The dredging work is a large-scale construction and requires a large construction cost. Therefore, if the dredging work is repeated many times, the labor and cost spent cannot be used, and there is a problem that it is inefficient and uneconomical.
[0004]
In addition, the conventional dredging work requires a large-scale device and a great deal of labor because the dredging vessel is used to mechanically dredge the sediment at the bottom of the water once and transport the dredged sediment. Was desired. In addition, dredging works on existing sea routes and berths would be a major obstacle for navigating ships, and there were many requests for dredging methods that would not hinder the navigation of ships. In addition, the dredging work often disturbs the sediment at the bottom of the water, and water pollution at the dredging work part may be an environmental problem.
[0005]
In order to solve such a problem, there has been proposed a construction method and a device in which a sediment transfer pipe having a sediment inflow hole is buried in sediment at the bottom of the water, and the sediment is forcibly discharged using a water flow (for example, Patent Reference 1).
[0006]
[Patent Document 1]
JP-A-2002-235337 (page 1-5, FIG. 1-8)
[0007]
[Problems to be solved by the invention]
However, in the above-described method or apparatus, as a method of forcibly discharging the sediment, power or natural force (water flow) by a pump or the like is used from one end side of the sediment transfer pipe to the other end side. It is necessary to further promote effective utilization and to adjust the power of the water flow in accordance with the characteristics of the earth and sand or the balance with the position or number of the earth and sand inflow holes according to the target water area.
[0008]
That is, when the amount of water in the water flow in the sediment transfer pipe is too large, the sediment gushes from the sediment inflow hole provided in the sediment transfer pipe, and the sediment causes surrounding pollution. Conversely, if the amount of water in the water flow in the sediment transfer pipe is insufficient, the sediment that has flowed in from the sediment inflow hole may be accumulated in the sediment transfer pipe without being discharged, and the sediment transfer pipe may be blocked.
[0009]
For this reason, in order to efficiently transfer the earth and sand in the earth and sand transfer pipe, it is necessary to maintain the ratio of the earth and sand (the mud content) in the earth and sand flow in which the water stream and the earth and sand are mixed at an optimum value. In addition, it is necessary to adjust the amount of sediment discharged according to the location. In the target water area, it is necessary to make full use of the energy of water flows such as tidal currents and river flows. Furthermore, if the sediment water flow is discharged using only the other end (discharge end) of the sediment transfer pipe, the discharged sediment may be concentrated at one location.
[0010]
The present invention has been made in order to solve the above-described problems, and an object of the present invention is to utilize a natural force and adjust a sediment inflow amount so as to have an appropriate mud content. It is an object of the present invention to provide a submarine sediment removal method and a submarine sediment removal apparatus capable of efficiently removing and discharging sediment in consideration of the environment.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the method of removing undersea sediment according to claim 1 comprises:
A plurality of sediment inflow holes bury a sediment transfer pipe, which is juxtaposed in the longitudinal direction of the pipe wall, in the bottom sediment,
A water flow for transfer is introduced into the sediment transfer pipe by placing an intake port at one end of the sediment transfer pipe in water,
Allowing the submerged sediment to flow into the interior of the sediment transfer pipe from the sediment inflow hole,
Transferring the sediment flowing into the sediment transfer pipe toward the other end by flowing the transfer water stream taken from one end of the sediment transfer pipe toward the other end,
The submerged sediment is removed by discharging the conveyed sediment from the other end of the sediment transfer pipe.
[0012]
Further, the undersea sediment removal apparatus according to claim 2 is:
A plurality of sediment inflow holes are juxtaposed in the longitudinal direction of the pipe wall, and an intake port is provided on one end side at a position to be in the water, and a sediment transfer pipe buried in the bottom sediment,
A fluid for forcibly moving the water in the sediment transfer pipe toward the other end of the sediment transfer pipe to generate a transfer water flow, and forcibly moving the bottom sediment flowing from the sediment inflow hole toward the other end. It is characterized by comprising a driving means.
[0013]
Further, the undersea sediment removing device according to claim 3 is the undersea sediment removing device according to claim 2,
The earth and sand inflow hole is provided with earth and sand inflow amount adjusting means for adjusting the inflow amount of earth and sand.
[0014]
The undersea sediment removal apparatus according to claim 4 is the undersea sediment removal apparatus according to claim 3,
The earth and sand inflow amount adjusting means changes a hole diameter of the earth and sand inflow hole.
[0015]
The undersea sediment removing apparatus according to claim 5 is the undersea sediment removing apparatus according to claim 3,
The earth and sand inflow adjusting means changes the number of the earth and sand inflow holes.
[0016]
Further, the undersea sediment removing device according to claim 6 is the undersea sediment removing device according to claim 3,
The earth and sand inflow amount adjusting means changes a position of the earth and sand inflow hole.
[0017]
The undersea sediment removing device according to claim 7 is the undersea sediment removing device according to claim 2,
The intake port is formed in a substantially hopper shape that opens in a direction opposite to the direction of the transfer water flow.
[0018]
The undersea sediment removing device according to claim 8 is the undersea sediment removing device according to claim 7,
The water intake is provided with a water flow follower that follows the change in the direction of the water flow, which is the direction of the transfer water flow, so that the opening direction of the water intake always faces the water flow direction.
[0019]
Further, the undersea sediment removing device according to claim 9 is the undersea sediment removing device according to claim 2,
A check valve for preventing backflow from inside the sediment transfer pipe is provided at a location of the sediment transfer pipe near the water intake port.
[0020]
The undersea sediment removing apparatus according to claim 10 is the undersea sediment removing apparatus according to claim 2,
A plurality of sediment water discharge holes are dispersedly provided on a pipe wall at the other end of the sediment transfer pipe.
[0021]
Further, the undersea sediment removal device according to claim 11 is the undersea sediment removal device according to claim 10,
The sediment water flow discharge hole is provided with a sediment water flow discharge adjusting means for adjusting the discharge amount of the sediment water flow.
[0022]
The undersea sediment removing device according to claim 12 is the undersea sediment removing device according to claim 11,
The earth and sand flow discharge adjusting means changes a hole diameter of the earth and sand flow discharge hole.
[0023]
Further, the undersea sediment removing device according to claim 13 is the undersea sediment removing device according to claim 11,
The said sediment water flow discharge amount adjusting means changes the number of the said sediment water flow discharge holes.
[0024]
Further, the undersea sediment removing device according to claim 14 is the undersea sediment removing device according to claim 11,
The sediment flow discharge adjusting means changes a position of the sediment flow discharge hole.
[0025]
The undersea sediment removing device according to claim 15 is the undersea sediment removing device according to claim 2,
The fluid driving means is a suction pump disposed downstream of the earth and sand transfer pipe.
[0026]
The undersea sediment removing device according to claim 16 is the undersea sediment removing device according to claim 2,
The fluid driving means is a pressurizing pump disposed upstream of the earth and sand transfer pipe.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a submarine sediment removal apparatus according to an embodiment of the present invention. As shown in FIG. 1, the underwater sediment removing apparatus 1 includes a sediment transfer pipe 3.
[0028]
The sediment transfer pipe 3 is a tubular member made of a material such as metal, synthetic resin, or concrete, and is connected to the horizontal part 3 of the sediment transfer pipe, one end of the horizontal part 3 of the sediment transfer pipe, and to the water intake 7 (described later). It has a sediment transfer pipe standing portion 8 to be connected, and is installed inside the sediment 2 deposited on the sea floor. The seabed sediment 2 corresponds to the waterbed sediment in the claims. A plurality of sediment inflow holes 4 are provided in parallel with the pipe wall along the longitudinal direction (the left-right direction in FIG. 1) of the sediment transfer pipe horizontal part 3 above the sediment transfer pipe horizontal part 3.
[0029]
Accordingly, as shown by the small arrow from top to bottom in FIG. 1, the seabed sediment 2 drops through the sediment inflow hole 4 into the sediment transfer pipe horizontal part 3 and flows therein.
[0030]
A sediment transfer pipe standing part 8 is connected to one end (left end in FIG. 1) of the sediment transfer pipe horizontal part 3, and a water intake port 7 is provided at the other end of the sediment transfer pipe standing part 8. . The distal end of the water intake 7 is formed in a substantially hopper-like shape with an upward opening, and is located in the underwater part.
[0031]
On the other hand, a suction pump 6 is provided at the other end (the right end in FIG. 1) of the horizontal portion 3 of the sediment transfer pipe 3, and the suction pump 6 is provided, and water taken from the water inlet 7 (hereinafter referred to as “transfer water”). 5 is sucked to be forcibly transferred to the other end. Instead of the suction pump 6, another pressurizing pump (not shown) is provided on the sediment transfer pipe standing part 8 side to pressurize the water and move the sediment transfer pipe standing part 8 from the sediment transfer pipe horizontal part. 3 may be adopted. The suction pump 6 or another pressurizing pump (not shown) corresponds to a fluid driving unit in the claims.
[0032]
With this configuration, the sediment 2 that has fallen and flowed into the horizontal portion 3 of the sediment transfer pipe from the sediment inflow hole 4 becomes a flow (sediment water flow) 16 mixed with the transfer water 5 to form a sediment transfer pipe. It flows inside the horizontal part 3. Therefore, as shown by the arrow from left to right in FIG. 1, the sediment 2 that has flowed into the horizontal portion 3 of the sediment transfer pipe moves to the sediment discharge end 18 of the horizontal portion 3 of the sediment transfer pipe (the right end in FIG. 1). It is transported toward. Then, the sediment transferred together with the transfer water 5 is discharged from the sediment discharge end 18 of the horizontal portion 3 of the sediment transfer pipe.
[0033]
The earth and sand discharge end 18 of the horizontal portion 3 of the earth and sand transfer pipe is installed in a water area (outside the target water area) where there is no problem even if the earth and sand are accumulated. As a result, the seabed sediment 2 in the target water area in which the horizontal portion 3 is installed is removed.
[0034]
According to the undersea sediment removal method using the undersea sediment removal apparatus 1 described above, there are the following advantages.
[0035]
(A) Since the seabed sediment 2 continuously flows into the inside of the horizontal portion 3 of the sediment transfer pipe in the seabed sediment 2, the sand removal effect is continuously exerted.
[0036]
(B) Initially, it is necessary to install the horizontal part 3 of the sediment transfer pipe in the sediment sediment 2 on the seabed. However, no special labor or equipment is required, and the cost is lower than that of the conventional dredging. It is cheap.
[0037]
(C) After first installing the horizontal portion 3 of the sediment transfer pipe in the sediment 2 on the seabed, there is no hindrance to the navigation of the ship. In addition, since there is no installation on the sea floor, there is little risk of obstruction to bottom seine fishing and damage by the anchor of the ship.
[0038]
(D) The earth and sand flow inside the horizontal portion 3 of the earth and sand transfer pipe below the sea bottom, so that the occurrence of water pollution is minimized.
[0039]
(E) In the state shown in FIG. 1, the internal pressure of the sediment transfer pipe horizontal part 3 is changed to the sediment inflow hole 4 because the water intake port 7 communicating with one end of the sediment transfer pipe horizontal part 3 is open in water. No water pressure higher than the water pressure (water pressure between AB) from the water surface 15 to the water surface 15 is applied. On the other hand, the pressure outside the earth and sand inflow hole 4 is obtained by adding the earth pressure between B and C to the water pressure between A and C. Since the earth pressure between B and C is higher than the water pressure between B and C, there is a possibility that the sediment water flow in the horizontal portion 3 of the sediment transfer pipe flows out (backflow) from the sediment inflow hole 4 to the outside of the pipe to cause pollution. Absent.
[0040]
The underwater sediment removal apparatus 1 described above is provided with a mechanism for further enhancing its operation and effect. FIG. 2 is a diagram illustrating a configuration of an example of a sediment inflow adjusting mechanism provided in the above-described undersea sediment removal apparatus 1.
[0041]
In the example shown in FIG. 2, the valve 9 is used as a mechanism for adjusting the amount of sediment inflow. That is, a valve 9 communicating with the sediment inflow hole 4 is provided on the outer peripheral surface side of the sediment transfer pipe horizontal part 3, and by adjusting the opening of the valve 9, the amount of sediment flowing into the sediment transfer pipe horizontal part 3 is adjusted. Is to adjust. The sediment inflow adjusting mechanism having the valve 9 corresponds to the sediment inflow adjusting means in the claims.
[0042]
The operation of the valve 9 can be remotely controlled by providing an actuator (not shown) to the valve 9 to make it an electromagnetic valve and sending a control signal through a lead wire. Further, it is also possible to provide an actuator (not shown), an ultrasonic receiver, and the like to the valve 9 and send a control signal by ultrasonic waves transmitted in water to remotely control the apparatus wirelessly. When the burial depth of the horizontal portion 3 is small, a mechanical mechanism such as a lever or a gear may be attached to the valve 9 so that the valve 9 can be manually operated.
[0043]
Providing the earth and sand inflow amount adjusting means in the earth and sand inflow hole 4 has the following advantages in addition to the above advantages (a) to (e).
[0044]
(F) Since the ratio of the sediment 2 flowing through the sediment inflow hole 4 to the amount of water flowing through the water intake port 7 (the mud content) can be adjusted, the pollution caused by the backflow of sediment and In addition, it is possible to prevent blockage (clogging) or the like due to accumulation of sediment in the horizontal portion 3 of the sediment transfer pipe due to a shortage of water in the standing portion 8 of the sediment transfer pipe.
[0045]
Further, as the sediment inflow adjusting means, another sediment inflow adjusting mechanism as shown in FIG. 3 is also possible. This earth and sand inflow amount adjusting mechanism has a wire mesh 10, a weight 11, and a wire 12. First, the wire mesh 10 is provided around the outside of the earth and sand inflow hole 4 to prevent dust from entering the earth and sand inflow hole 4. Further, a weight 11 having an outer diameter for closing the earth and sand inflow hole 4 is provided inside the wire mesh 10. Then, the weight 11 is configured to be able to move up and down by the wire 12 inserted into the wire mesh 10 through the mesh of the wire mesh 10. In addition, a driving means (not shown) such as a motor or a jack (not shown) is connected to the wire 12 so that the wire 12 can be driven. With such a configuration, the gap amount between the earth and sand inflow hole 4 and the weight 11 can be adjusted, and the amount of earth and sand inflow can be adjusted. Note that a rod-shaped member or a chain-shaped member may be used instead of the wire 12.
[0046]
Further, the plurality of sediment inflow holes 4 can be selectively closed by the weight 11, and the number of open (or closed) sediment inflow holes 4 can be adjusted. Thereby, the inflow amount of the earth and sand may be adjusted.
[0047]
Alternatively, the horizontal portion 3 of the earth and sand transfer pipe is configured to be rotatable around a center line in the longitudinal direction, and a driving means (not illustrated) such as a motor (not illustrated) is connected so as to be rotatable. . With such a configuration, the vertical position of the earth and sand inflow hole 4 provided on the outer wall of the earth and sand transfer pipe horizontal part 3 can be changed to the top, side, and bottom of the earth and sand transfer pipe horizontal part 3, Thereby, it is also possible to adjust the amount of sediment flowing from the sediment inflow hole 4.
[0048]
In addition, when there is a natural force such as a water flow in the target water area, the above-described underwater sediment removal apparatus 1 can use it. FIG. 4 is a diagram illustrating a configuration of an example of a water intake port in the undersea sediment removal apparatus of FIG. 1.
[0049]
That is, as shown in FIG. 4, a substantially hopper-shaped intake port 7 </ b> A that opens to face the water flow F is provided at the tip of the intake port 7. With such a configuration, the water flow F can be efficiently taken into the sediment transfer pipe standing portion 8, and the natural energy of the water flow F can be used as a support force for the power for transferring the sediment.
[0050]
In this case, by providing the check valve 13 in the sediment transfer pipe standing portion 8, the water flow in the sediment transfer pipe horizontal part 3 reversely flows due to the strength or direction of the water flow or the change in the water level due to the change in natural conditions. Can be prevented.
[0051]
As the above-mentioned natural force, waves, tidal action, tidal current, river flow, etc. can be used in addition to the water current.
[0052]
Next, in the example shown in FIG. 5, the lower end 71 of the water intake port 7A is rotatably fitted to the upper end 81 of the sediment transfer pipe standing portion 8 in consideration of the change in the flowing direction of the water flow F. The intake port 7A is rotatably connected to the sediment transfer pipe standing portion 8 so as to be rotatable in the rotation direction R, and the tail fin 14 is provided at the back (right side in FIG. 5) of the intake port 7A. Thus, a water flow following mechanism that follows a change in the direction of the water flow F is configured. This water flow tracking mechanism corresponds to a water flow tracking device in the claims.
[0053]
With the above configuration, the opening direction of the water intake 7A is always maintained in a direction (parallel) to the water flow F, and the natural energy is always supported by the change of the water flow F to support the earth and sand transfer power. Can be used as power.
[0054]
Next, in the example shown in FIG. 6, if the sediment water flow 16 is discharged only from the discharge end of the sediment discharge end 18 of the horizontal portion 3 of the sediment transfer pipe, the discharged sediment 19 may be concentrated at one location. The amount of earth and sand 19 to be discharged can be adjusted according to the location.
[0055]
That is, as shown in FIG. 6, a plurality of sediment water discharge holes 17 are formed on the side and below the pipe wall of the sediment discharge end 18 of the sediment transfer pipe horizontal part 3 in the longitudinal direction and the circumference of the sediment transfer pipe horizontal part 3. They are distributed in the directions. By providing the plurality of sediment water flow discharge holes 17 in this way, the discharged sediment 19 is dispersed not only from the sediment discharge end 18 but also over a wide range in the longitudinal direction and the radial direction of the horizontal portion 3 of the sediment transfer pipe. As a result, it is possible to prevent the discharged sediment 19 from being concentrated in one place, and to disperse the sediment 20 in a wide area.
[0056]
Although not shown, by providing a mechanism (sediment water flow discharge adjustment mechanism) for adjusting the discharge amount of the sediment water flow in each of the sediment water flow discharge holes 17, the discharge amount of the discharged sediment 19 can be adjusted and the discharge area ( Distribution) can be adjusted.
[0057]
As a specific example of the mechanism for adjusting the amount of discharge of the sediment water flow, a mechanism is provided in which the valve as described in FIG. 2 is provided in the discharge hole 17 of the sediment water flow, and the degree of opening is electromagnetically or manually changed. Thereby, the opening degree of the valve can be adjusted according to the condition of the target water area. Alternatively, a valve may be provided in each of the plurality of sediment water flow discharge holes 17 and individually controlled to adjust the number of open valves.
[0058]
Further, the earth and sand discharge end 18 may be configured to be extendable and contractible in its longitudinal direction (the left-right direction in FIG. 6), and the horizontal position of the earth and sand flow discharge hole 17 may be changed. Alternatively, the portion of the earth and sand discharge end 18 is attached to the end of the earth and sand transfer tube standing portion 8 as a member separate from the earth and sand transfer tube horizontal portion 3 so as to be rotatable in its circumferential direction. It is also possible to change the ejection direction in the circumferential direction.
[0059]
Note that the present invention is not limited to the above-described embodiment and each example. The above-described embodiments and examples are merely examples, and any one having substantially the same configuration as the technical idea described in the claims of the present invention and exerting the same function and effect will be described. However, they are also included in the technical scope of the present invention.
[0060]
For example, in each of the above embodiments, the underwater sediment removal device installed in the sediment on the seabed was described as an example, but the present invention is not limited to this, and other parts other than the seabed, for example, Even when the sediment is placed in the sediment on the bottom of the inland water area such as a lake, a pond, or a swamp, the sediment can be transferred and removed.
[0061]
【The invention's effect】
As described above, according to the undersea sediment removal method and the undersea sediment removal apparatus according to the present invention, a sediment transfer pipe in which a plurality of sediment inflow holes are arranged in the longitudinal direction is buried in the undersea sediment, and the sediment is removed. The transfer water flow is introduced into the sediment transfer pipe by placing the water intake at one end of the transfer pipe in the water, sediment flows into the sediment transfer pipe from the sediment inflow hole, and water is transferred from one end of the sediment transfer pipe. The sediment flowing into the sediment transfer pipe was transferred toward the other end by flowing the irrigation water flow toward the other end, and the transferred sediment was discharged from the other end of the sediment transfer pipe. There is an advantage that soil and sand can be removed efficiently. In addition, since the bottom sediment continuously flows into the inside of the sediment transfer pipe in the bottom sediment, there is an advantage that the sediment removing effect is continuously exerted. At first, it is necessary to install a sediment transfer pipe in the sediment at the bottom of the water, but no special labor or equipment is required, and the cost is lower than conventional dredging. There are advantages. After the sediment transfer pipe is first installed in the bottom sediment, there is no hindrance to the navigation of the ship. In addition, since there is no installation on the water bottom, there is an advantage that there is little risk of obstacles to the bottom seine fishery and damage due to the anchor of the ship. Further, since the earth and sand flows inside the earth and sand transfer pipe below the water bottom, there is an advantage that the occurrence of water pollution is minimized. In addition, the internal pressure of the sediment transfer pipe does not exceed the water pressure from the sediment inflow port to the water surface because the water intake opening communicating with one end of the sediment transfer pipe is open in water. Since the outer pressure is higher than the water pressure, there is an advantage that the sediment water flow in the sediment transfer pipe does not flow out (backflow) from the sediment inflow hole to the outside of the pipe to generate pollution.
[0062]
Further, by providing the sediment inflow control means in the underwater sediment removing apparatus, the ratio of the sediment flowing through the sediment inflow hole to the amount of water flowing through the water intake port (the mud content) can be adjusted. In addition, there is an advantage that it is possible to prevent pollution caused by backflow of earth and sand, and blockage (clogging) caused by accumulation of earth and sand in the earth and sand transfer pipe due to a shortage of water in the earth and sand transfer pipe.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a submarine sediment removal apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a configuration of an example of a sediment inflow control mechanism provided in the undersea sediment removing apparatus of FIG. 1;
FIG. 3 is a diagram showing the configuration of another example of the sediment inflow adjusting mechanism provided in the undersea sediment removing apparatus of FIG. 1;
FIG. 4 is a diagram showing a configuration of an example of a water intake in the undersea sediment removing apparatus of FIG. 1;
FIG. 5 is a diagram showing another example of the configuration of the water intake port in the undersea sediment removing apparatus of FIG. 1;
FIG. 6 is a diagram showing an example of a configuration of a sediment discharge end in the undersea sediment removing apparatus of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Underwater sediment removal apparatus 2 Sediment sediment 3 Sea bottom sediment transfer pipe horizontal part 4 Sediment inflow hole 5 Transfer water 6 Suction pump 7, 7A Intake port 8 Sediment transfer pipe standing part 9 Valve 10 Wire net 11 Weight 12 Wire 13 Check valve 14 Tail 15 Water surface 16 Sediment flow 17 Sediment flow discharge hole 18 Sediment discharge end 19 Discharged sediment 20 Sediment 71 Lower end 81 Upper end F Water flow

Claims (16)

A plurality of sediment inflow holes bury a sediment transfer pipe, which is juxtaposed in the longitudinal direction of the pipe wall, in the bottom sediment,
A water flow for transfer is introduced into the sediment transfer pipe by placing an intake port at one end of the sediment transfer pipe in water,
Allowing the submerged sediment to flow into the interior of the sediment transfer pipe from the sediment inflow hole,
Transferring the sediment flowing into the sediment transfer pipe toward the other end by flowing the transfer water stream taken from one end of the sediment transfer pipe toward the other end,
A method for removing submerged sediment by discharging the conveyed sediment from the other end of the sediment transfer pipe to remove the submerged sediment. A plurality of sediment inflow holes are juxtaposed in the longitudinal direction of the pipe wall, and an intake port is provided on one end side at a position to be in the water, and a sediment transfer pipe buried in the bottom sediment,
A fluid for forcibly moving the water in the sediment transfer pipe toward the other end of the sediment transfer pipe to generate a transfer water flow, and forcibly moving the bottom sediment flowing from the sediment inflow hole toward the other end. An underwater sediment removal apparatus comprising a driving unit. In the underwater sediment removal apparatus according to claim 2,
An underwater sediment removing apparatus, wherein the sediment inflow hole is provided with a sediment inflow adjusting means for adjusting an inflow amount of the sediment. The undersea sediment removal apparatus according to claim 3,
The underwater sediment removal apparatus, wherein the sediment inflow adjusting means changes a hole diameter of the sediment inflow hole. The undersea sediment removal apparatus according to claim 3,
The underwater sediment removal apparatus, wherein the sediment inflow adjusting means changes the number of the sediment inflow holes. The undersea sediment removal apparatus according to claim 3,
The underwater sediment removing apparatus, wherein the sediment inflow adjusting means changes a position of the sediment inflow hole. In the underwater sediment removal apparatus according to claim 2,
The underwater sediment removing apparatus, wherein the water intake port is formed in a substantially hopper shape that opens in a direction opposite to the direction of the transfer water flow. The undersea sediment removal apparatus according to claim 7,
Water-floor sediment, wherein the water intake is provided with a water flow follower for always keeping the opening direction of the water intake opposite to the water flow direction by following a change in a water flow direction which is a direction of the transfer water flow. Removal device. In the underwater sediment removal apparatus according to claim 2,
An underwater sediment removal apparatus, wherein a check valve for preventing backflow from inside the sediment transfer pipe is provided at a location of the sediment transfer pipe near the water intake port. In the underwater sediment removal apparatus according to claim 2,
A submarine sediment removing apparatus, wherein a plurality of sediment water discharge holes are dispersedly provided in a pipe wall at the other end of the sediment transfer pipe. The undersea sediment removal apparatus according to claim 10,
An underwater sediment removing apparatus, wherein the sediment water discharge hole is provided with a sediment water flow discharge adjusting means for adjusting the discharge amount of the sediment water flow. The undersea sediment removal apparatus according to claim 11,
The underwater sediment removal apparatus, wherein the sediment flow discharge adjusting means changes a diameter of the sediment flow discharge hole. The undersea sediment removal apparatus according to claim 11,
The underwater sediment removing apparatus, wherein the sediment water discharge amount adjusting means changes the number of the sediment water discharge holes. The undersea sediment removal apparatus according to claim 11,
The underwater sediment removing apparatus, wherein the sediment water discharge adjusting means changes a position of the sediment water discharge hole. In the underwater sediment removal apparatus according to claim 2,
The underwater sediment removing apparatus, wherein the fluid driving means is a suction pump disposed downstream of the sediment transfer pipe. In the underwater sediment removal apparatus according to claim 2,
The underwater sediment removing apparatus according to claim 1, wherein the fluid driving means is a pressurizing pump disposed upstream of the sediment transfer pipe.

Images