JP6470661B2 - Transfer method - Google Patents

Description

  The present invention relates to a transfer method, and more particularly to a transfer method for transferring fine particles accumulated at the bottom of a river to the upstream side of the river.

  Conventionally, the artificial ground for rooftop greening described in Patent Document 1 is known. The artificial ground for rooftop greening described in Patent Document 1 includes a water channel constituting a river part, a pond part provided in a downstream part of the water channel, and a pump and a pipe for sending the water of the pond part to the upstream end part of the river part And comprising. One end of the pipe is connected to the pond via a pump, and the other end is connected to the upstream end of the river. In this artificial ground for rooftop greening, water is circulated through the water channel by operating the pump.

JP 2008-61553 A

  In general, in rivers, fine particles flow from the upstream side to the downstream side due to erosion caused by water flow. The fine particles are accumulated at the bottom of the river (bottom environment). In this sediment environment, organisms such as kawainina may inhabit. In order to maintain biodiversity by maintaining the habitat of living organisms in rivers, fine particles from the downstream sediments are removed from the river as fine particles flow from the upstream side of the river. It is conceivable to transfer to the upstream side and suppress the immobilization of fine particles. However, if water on the downstream side of the river is directly sucked with a pump as in the prior art described above, fine particles are crushed and agitated when passing through the pump, damaging the organisms contained in the fine particles. There is a fear. Moreover, since the weight of the fine particle part containing water is large in order to transfer a fine particle part to the upstream of a river by human power, big labor will be required.

  An object of the present invention is to easily transfer fine particles to the upstream side of a river while reducing the possibility of damaging organisms that the fine particles may contain.

  In order to solve the above-mentioned problems, the present inventors have made extensive studies, and as a result, a negative pressure is generated in the throttle portion provided on the pumping flow path, and fine particles are sucked by using this negative pressure. It was found that the possibility of damaging organisms that can be contained in the fine particles can be reduced by transporting the fine particles to the upstream side of the river together with the water to be pumped. Thus, the present inventors have found that the fine particles can be transferred to the upstream side of the river by using the method of sucking the fine particles in this way, and have completed the present invention.

  The transfer method according to the present invention is a transfer method for transferring fine particles accumulated at the bottom of a river to the upstream side of the river, and includes a water pipe connecting the upstream side of the river and the downstream side of the river. The first step of pumping the water downstream of the river to the upstream of the river and the negative pressure at the throttle provided on the pumping flow path of the water pipe using the water pumped through the water pipe A second step of generating a fine particle, a third step of sucking fine particles through a transport pipe connecting the bottom of the river and the throttle section using the negative pressure generated in the throttle section, and a transport pipe And a fourth step of transferring the fine particles sucked through the upstream side of the river together with the water pumped through the water pipe.

  In this transfer method, the water on the downstream side of the river is pumped to the upstream side of the river via a flowing water pipe. A negative pressure is generated in a throttle portion provided on a pumping flow path of the flowing water pipe using water pumped through the flowing water pipe. Using the negative pressure generated in the throttle part, fine particles are sucked through the transport pipe connecting the bottom of the river and the throttle part. The fine particles sucked through the transport pipe are transferred to the upstream side of the river together with the water pumped through the running water pipe. In this way, a negative pressure is generated at the constricted portion provided on the pumping flow path, the fine particles are sucked using this negative pressure, and the fine particles sucked to the upstream side of the river are transported together with the pumped water. Therefore, it is possible to easily transfer the fine particles to the upstream side of the river while reducing the possibility of damaging the organisms that the fine particles may contain.

  This transfer method may further include a fifth step of adjusting the amount of fine particles sucked in the third step. In this case, by adjusting the amount of fine particles to be sucked, the amount of fine particles transferred to the upstream side of the river can be changed according to the amount of fine particles accumulated at the bottom of the river.

  In this transfer method, the amount of fine particles sucked in the fifth step may be adjusted by a valve provided on the negative pressure transmission path. In this case, the amount of fine particles to be sucked can be adjusted directly and easily by using a valve provided on the negative pressure transmission path.

  In this transfer method, in the first step, water on the downstream side of the river may be pumped to the upstream side of the river by a pump. In this case, by using a pump, water on the downstream side of the river can be suitably pumped to the upstream side of the river.

  In this transfer method, fine particles are accumulated at the bottoms at a plurality of locations in the river, and in the third step, the fine particles are sucked through transport pipes connecting the bottoms at the plurality of locations in the river and the throttle portions. Also good. In this case, it is possible to easily transfer the fine particles accumulated in the plurality of locations in the river to the upstream side of the river by sucking the fine particles in each of the bottom portions in the plurality of locations in the river.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to transfer a fine particle part to the upstream of a river easily, reducing the possibility of damaging the organism which a fine particle part may contain.

It is a schematic perspective view which shows the river to which the transfer method is applied. It is a schematic sectional drawing which shows the piping structure of the river of FIG. (A) is sectional drawing which shows a sand settling part. (B) is another sectional view showing a sand settling part. (C) is another sectional view showing a sand settling part. (A) is sectional drawing which shows an aperture_diaphragm | restriction part. (B) is another cross-sectional view showing the aperture portion. It is a schematic perspective view which shows the other river to which the transfer method is applied. (A) is a schematic sectional drawing which shows the piping structure of the river of FIG. (B) is a schematic sectional drawing which shows the other piping structure of the river of FIG. It is a schematic sectional drawing which shows the other river to which the transfer method is applied.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

  As shown in FIG. 1, the river 1 is a stream-type biotope formed, for example, by artificially simulating a stream (murmur). The river 1 is not limited to a stream-type biotope, and may be a relatively large river-type biotope or a naturally formed river. The river 1 may be formed outdoors or indoors.

  The river 1 includes a main channel 2 and a sub channel 3. In the following description, the upstream side in the sub-channel 3 corresponds to the downstream side of the main channel 2, and the downstream side in the sub-channel 3 corresponds to the upstream side of the main channel 2. The term “upstream” or “downstream” simply means upstream in the main channel 2 (upstream of the river 1) or downstream in the main channel 2 (downstream of the river 1).

  In the river 1, the water flows from the upstream side to the downstream side, so that the water flow of the river 1 is obtained. In the river 1, the water flows to the downstream side, then returns to the upstream side through the sub-flow path 3, and circulates in the river 1.

  In the river 1, the main flow path 2 is formed using, for example, earth and sand or stone. The main channel 2 is a water channel with a downward slope from the upstream side toward the downstream side. Therefore, in the river 1, there is a portion where the surface of the main flow path 2 is eroded by the water flow, and gravel and fine particles generated by the erosion flow downstream. The gravel is soil particles having a particle size of 2 mm or more, for example. The fine particles are soil particles having a particle size of less than 2 mm, for example. Examples of the fine particles include coarse sand, fine sand, silt, and clay. In the river 1, generally, the fine grain portion flows more downstream than the gravel portion. In the river 1, fine particles are likely to settle when the flow rate of water is reduced, for example, in a place where the water depth is deep, and are easily accumulated at the bottom of the river (bottom environment). The sediment environment is a living environment for organisms formed at the bottom of a river by accumulating fine particles. The sediment environment here is formed in a thickness of about 20 cm, for example, by design.

  As shown in FIG. 1 and FIG. 2, the main channel 2 has a discharge port 10, a pond unit 11, a water channel 12, a pond unit 13, a water channel 14, and a pond unit 15 in order from the upstream side. Yes. First, the configuration of the main channel 2 will be described.

  The pond part 11 is a water storage part provided in the most upstream part of the river 1. For example, a discharge port 10 is provided in the pond part 11, and water is supplied from the discharge port 10. In addition to the water supplied from the discharge port 10, water may be supplied to the pond part 11 from the outside. A water channel 12 is connected to the pond part 11 on the downstream side. In the pond part 11, the supplied water is stored and the water flows out into the water channel 12.

  The water channel 12 connects the pond part 11 and the pond part 13. In the water channel 12, the width between the two banks in the direction intersecting with the water flow direction (hereinafter simply referred to as the river width direction) (hereinafter simply referred to as the river width) is smaller than the river width of the pond portion 11 and the pond portion 13. Therefore, in the water channel 12, water flows at a flow rate faster than the flow rate of water in the pond part 11 and the pond part 13.

  The pond part 13 is a water storage part provided in the middle of the river 1. The pond part 13 is formed so that the river width is wider than the river width in the water channel 12. Moreover, the pond part 13 has a deeper water depth than the water channel 12. Therefore, in the pond part 13, the flow velocity of the water flow is lower than the flow velocity in the water channel 12, and the fine fraction F <b> 1 shed from the upstream side tends to settle on the bottom of the pond part 13. Therefore, the pond part 13 comprises the part (henceforth the sand settling part S1) in which the fine particle part F1 is accumulate | stored in the bottom part (bottom environment) of a river. The sand settling part S1 is not limited to this example, and may be a part in which the fine grain fraction F1 is accumulated. For example, it may be formed so as to reduce the flow velocity of the water flow by changing other than the width and water depth, or it is arranged with a stone or the like so as to physically capture the fine particle portion F1, and the fine particle portion F1 is accumulated. May be. Moreover, the pond part 13 here is the sand settling part S1 intentionally formed in order to re-supply the fine particle part F1 to the upstream of the river 1. FIG. The sand settling part S1 is not limited to what was formed intentionally, and when the river 1 is a naturally formed river, for example, a dredging part naturally formed by a water flow can be used as the sand settling part S1. it can.

  In the pond part 13, water flowing in from the water channel 12 is stored and water flows out to the water channel 14. The water channel 14 connects the pond part 13 and the pond part 15. The river width of the water channel 14 is smaller than the river width of the pond part 13. Therefore, in the water channel 14, water flows at a flow rate faster than the flow rate of water in the pond part 13.

  The pond part 15 is a water storage part provided in the most downstream part of the river 1. The pond part 15 is provided with, for example, an introduction pipe 20a at the bottom thereof. In the pond part 15, the water flowing in from the water channel 14 is stored, and the stored water is introduced into the auxiliary flow path 3 through the introduction pipe 20a.

  Then, the structure of the subchannel 3 is demonstrated. The sub-flow path 3 includes a flowing water part (flow water pipe) 20, a pumping pump 21, a throttle part 22, and a transport pipe 23. Each component of the sub-flow channel 3 is placed on the ground G and then covered with the soil M at the time of external greening (see FIG. 3A). The scooping of the auxiliary flow path 3 is not limited to this, and various modes can be adopted. For example, the auxiliary flow path 3 may be buried below the ground G as described later.

  The flowing water section 20 is a flowing water pipe that connects the upstream side of the river 1 and the downstream side of the river 1. The flowing water section 20 includes an introduction pipe 20a, a flowing water pipe 20b, and a flowing water pipe 20c from the upstream side of the sub flow path 3. As the flowing water unit 20, for example, a pipe made of vinyl chloride resin can be used. The diameter of the flowing water part 20 can be set according to the output of the pumping pump 21, and can be set to, for example, 25 mm to 150 mm. Here, the diameter of the flowing water part 20 is about 75 mm. The introduction pipe 20 a is a water introduction part from the main flow path 2 to the sub flow path 3. The introduction pipe 20 a connects the pond portion 15 of the main flow path 2 and the pressure feed pump 21 of the sub flow path 3.

  The pumping pump 21 is provided on the flow path of the flowing water unit 20. Here, the pressure pump 21 is a pump provided so as to connect the introduction pipe 20a and the flowing water pipe 20b. The pumping pump 21 pumps the water introduced through the introduction pipe 20a to the flowing water pipe 20b and the flowing water pipe 20c. That is, the flowing water pipe 20b and the flowing water pipe 20c are flow paths (pressure feeding flow paths) through which water pumped by the pressure feeding pump 21 flows. The pumping pump 21 pumps downstream water to the upstream side via the flowing water section 20 that connects the upstream side and the downstream side. Various pumps can be adopted as the pumping pump 21. For example, an axial pump having an electrically powered impeller is used. The output of the pumping pump 21 can be set according to the scale of the river 1, the amount of water circulation in the river 1, and the like, and can be set to, for example, 15L / min to 280L / min. Here, the output of the pressure feed pump 21 is an output of a discharge amount of 90 L per minute.

  The flowing water pipe 20 b is a water flow path connected to the downstream side of the pumping pump 21 in the sub flow path 3. The flowing water pipe 20 c is a water flow path disposed on the downstream side of the flowing water pipe 20 b in the sub flow path 3. In the flowing water pipe 20 c, the discharge port 10 is formed on the downstream side of the sub flow path 3 and connected to the pond part 11. The flowing water pipe 20b and the flowing water pipe 20c circulate the water pumped from the pumping pump 21. Therefore, the pumped water is transferred to the pond part 11.

  The throttle unit 22 is a throttle provided on the downstream side of the pumping pump 21 in the flowing water unit 20 (on the pumping flow path of the flowing water unit 20). Here, the throttle part 22 is provided between the flowing water pipe 20b and the flowing water pipe 20c. The diaphragm unit 22 is a diaphragm configured using the principle of an aspirator. The throttle part 22 is formed so that the flow passage cross-sectional area of the water is smaller than the flow passage cross-sectional areas of the water flow pipe 20b and the water flow pipe 20c. However, the flow path cross-sectional area of the throttle portion 22 does not include the flow path of the transport pipe 23.

  Specifically, as shown in FIG. 4A, the throttle portion 22 may have a shape in which the flow path is entirely throttled. In the example of FIG. 4A, the narrowed portion 22 has a raised portion 22x. The raised portion 22 x is a convex portion formed over the entire circumference in the circumferential direction of the inner periphery of the throttle portion 22. Therefore, the protruding portion 22x makes the flow path cross-sectional area of the throttle portion 22 smaller than the flow path cross-sectional areas of the water flow pipe 20b and the water flow pipe 20c. In the throttle portion 22, for example, the water flow rate increases and the water pressure decreases in the region Lx.

  Further, as shown in FIG. 4B, the restricting portion 22 may have a shape in which the flow path is partially restricted. In the example of FIG. 4B, the aperture 22 has a convex portion 22y. The convex part 22y is a convex part formed so that a part in the circumferential direction of the inner periphery of the throttle part 22 (here, the bottom part of the throttle part 22) protrudes. Therefore, the convex part 22y makes the flow-path cross-sectional area of the throttle part 22 smaller than the flow-path cross-sectional area of the flowing water pipe 20b and the flowing water pipe 20c. In the throttle portion 22, for example, the flow rate of water increases and the water pressure decreases in the region Ly. In addition, as a throttle part 22, it can replace with the example of Fig.4 (a) and FIG.4 (b), and can also apply a water-flow-type aspirator member.

  In the restricting portion 22, the water flow rate is increased and the water pressure is decreased at the location where the flow path is restricted. That is, the throttle unit 22 generates a negative pressure (negative pressure) using water pumped through the flowing water unit 20.

  The transport pipe 23 connects the sand settling part S <b> 1 and the throttle part 22. The transport pipe 23 is liquid-tightly configured between the sand settling part S1 and the throttle part 22, and transmits the negative pressure generated in the throttle part 22 to the sand settling part S1. That is, the transport pipe 23 is a negative pressure transmission path. The transport pipe 23 is connected to the region Lx or the region Ly of the throttle unit 22. More specifically, in the transport pipe 23, the pressure on the other end side (the throttle section 22 side) of the transport pipe 23 is less than the pressure on one end side (the sand settling section S1 side) of the transport pipe 23 due to the negative pressure generated in the throttle section 22. Is also connected to the narrowing portion 22 so as to be low.

  The transport pipe 23 is arranged so that one end thereof is located in the sand settling part S1. On one end side of the transport pipe 23, the fine fraction F1 of the sand settling part S1 is sucked by the negative pressure generated in the throttle part 22. As the transport pipe 23, for example, a rubber hose having an inner diameter of 5 mm to 10 mm can be used, and a thick hose that is not crushed by the negative pressure from the throttle portion 22 is employed. As the transport pipe 23, for example, a hard vinyl chloride pipe may be used. In the case where there is a connection portion for connecting a plurality of hard vinyl chloride pipes to each other in the transport pipe 23, for example, by providing a seal member in the connection portion, leakage of the connection portion is prevented, and the transport pipe 23 is liquid-tight. It may be configured.

  The transport pipe 23 may be placed on the ground G, for example, and may be covered with the soil M at the time of external greening. In this scooping, the transport pipe 23 is arranged so that one end thereof is inserted into the sand settling part S1 and extends toward the water surface of the pond part 13 along the bottom surface of the pond part 13 (see FIG. 3A). ). The transport pipe 23 may be embedded below the ground G. As an example of this scooping, the transport pipe 23 is arranged so that one end side thereof is arranged substantially vertically at the bottom of the pond part 13, extends toward the throttle part 22 through the bent part, and extends along the ground G. (See FIG. 3 (b)). Further, as another example of this scooping, the transport pipe 23 is arranged so that one end side thereof extends along the ground G at the bottom of the pond part 13 and the other end side thereof faces the throttle part 22 along the ground G. (See FIG. 3C).

  The valve V1 is a valve for adjusting the flow rate of the water flowing through the transport pipe 23 and the fine particle fraction F1. The valve V <b> 1 is liquid-tightly provided on the flow path of the transport pipe 23. That is, the valve V1 is provided on the negative pressure transmission path. The position of the valve V1 in the transport pipe 23 is not particularly limited. The valve V1 may be a manual type or an electric type.

  In the river 1 configured as described above, the pumping pump 21 is provided on the flow path of the flowing water portion 20. As a result, the water on the downstream side of the river 1 is pumped to the upstream side of the river 1 by the pumping pump 21 via the flowing water portion 20 that connects the upstream side of the river 1 and the downstream side of the river 1.

  In addition, a throttle portion 22 is provided on the pumping flow path of the flowing water section 20 (between the flowing water pipe 20b and the flowing water pipe 20c). Thereby, a negative pressure is generated in the throttling part 22 by the water pumped through the water pipe 20 b of the water flow part 20.

  In addition, one end of the transport pipe 23 is disposed at the bottom of the river 1 (the sand settling part S1), and the other end of the transport pipe 23 is connected to the regions Lx and Ly of the throttle part 22, and the sand settling part S1 and the throttle part 22 The transport pipe 23 is connected. As a result, the fine particle fraction F <b> 1 is sucked through the transport pipe 23 by the negative pressure generated in the throttle portion 22.

  Further, a valve V1 is provided on the negative pressure transmission path (transport pipe 23). As a result, the amount of fine particles F1 to be sucked is adjusted by the valve V1.

  Moreover, the water pumped by the pumping pump 21 through the flowing water pipe 20b merges with the fine particle portion F1 sucked through the transporting pipe 23 in the throttling portion 22 and flows into the flowing water pipe 20c. Thereby, the fine particle fraction F1 sucked through the transport pipe 23 is transferred to the upstream side of the river 1 together with the water fed under pressure through the flowing water pipe 20c.

  Next, an example of a transfer method for transferring the fine particle fraction F1 to the upstream side of the river 1 will be described. In addition, the 1st process-the 5th process in description of the following transfer methods attach | subject the ordinal number for convenience, and do not limit the order of a process.

  First, the water on the downstream side is pumped to the upstream side by the pumping pump 21 via the flowing water part 20 (first step). In the first step, water at a flow rate (for example, 90 L / min) that can generate a sufficient negative pressure in the second step is pumped by the pumping pump 21.

  Subsequently, a negative pressure is generated in the throttle unit 22 using the water pumped through the flowing water pipe 20b of the flowing water unit 20 (second step). Using the negative pressure generated in the squeezing part 22, the fine particle fraction F1 is sucked through the transport pipe 23 that connects the bottom part of the river 1 (sedimentation part S1) and the squeezing part 22 (third step). The fine particle fraction F1 sucked through the transport pipe 23 is transferred to the upstream side of the river 1 together with the water fed through the flowing water pipe 20c (fourth step).

  Here, the amount of fine particles F1 to be sucked is adjusted by the valve V1 provided on the negative pressure transmission path (transport pipe 23) (fifth step). In the fifth step, the amount of fine particles F1 sucked through the transport pipe 23 is adjusted according to the amount of fine particles F1 accumulated in the sand settling part S1. By adjusting the amount of fine particles F1 sucked through the transport pipe 23, for example, dynamic equilibrium in a sediment environment can be achieved. The dynamic equilibrium in the sediment environment is, for example, the amount of the fine fraction F1 supplied from the upstream side by the water flow of the river 1 and accumulated in the sediment environment, and the fine fraction sucked through the transport pipe 23 It means that the amount of F1 is substantially equal. As a result, in the sand settling part S1, for example, the fine fraction F1 can be suitably replaced while maintaining the thickness of the sediment environment, etc., and air, nutrients, etc. are supplied to the fine fraction F1 to create a sediment environment. It becomes good quality.

  In the transfer method as described above, in the first step, the water on the downstream side of the river 1 is pumped to the upstream side of the river 1 via the flowing water section 20 (the introduction pipe 20a, the flowing water pipe 20b, and the flowing water pipe 20c). Subsequently, in the second step, the water pumped through the flowing water section 20 is used, and the constricted section 22 provided on the pumping flow path of the flowing water section 20 (between the flowing water pipe 20b and the flowing water pipe 20c) is shaded. Generate pressure. Subsequently, by using the negative pressure generated in the squeezing part 22, in the third step, the fine particle fraction F <b> 1 is obtained via the transport pipe 23 that connects the bottom part (sedimentation part S <b> 1) of the river 1 and the squeezing part 22. Suction. And in a 4th process, the fine particle fraction F1 attracted | sucked through the transport pipe 23 is transferred to the upstream of the river 1 with the water pumped through the flowing water part 20 (flowing water pipe 20c). In this way, a negative pressure is generated in the constricted portion 22 provided on the pumping flow path, the fine particle portion F1 is sucked using this negative pressure, and the fine particle portion F1 sucked together with the pumped water is taken up in the river 1 Since it transfers to the upstream side, it becomes possible to transfer the fine particle part F1 to the upstream side of the river 1 easily, reducing the possibility of damaging the organism which the fine particle part F1 may contain.

  This transfer method further includes a fifth step of adjusting the amount of fine particles F1 sucked in the third step. By adjusting the amount of fine particles F1 to be sucked, the amount of fine particles F1 transferred to the upstream side of the river 1 depends on the amount of fine particles F1 accumulated at the bottom of the river 1 (sedimentation part S1). Can be changed.

  In this transfer method, the amount of the fine particle fraction F1 sucked in the fifth step is adjusted by a valve V1 provided on the negative pressure transmission path (transport pipe 23). As described above, by using the valve V1 provided on the negative pressure transmission path, the amount of the fine particles F1 to be sucked can be directly and easily adjusted.

  In this transfer method, water in the downstream side of the river 1 is pumped to the upstream side of the river 1 by the pumping pump 21 in the first step. In this way, by using the pumping pump 21, the water on the downstream side of the river 1 can be suitably pumped to the upstream side of the river 1.

As mentioned above, although preferred embodiment which concerns on this invention was described, this invention is not limited to the said embodiment, It deform | transforms in the range which does not change the summary described in each claim, or is applied to another thing. May be.
[First Modification]

  In the above embodiment, only one sand settling portion S1 is provided in the main flow path 2, but the number of sand settling portions is not limited to this. For example, the transfer method according to the present invention can also be applied to rivers 1A and 1B having a plurality of sand sink portions as shown in FIGS.

  As shown in FIGS. 5 and 6A, the river 1A includes a main flow path 2A and a sub flow path 3A. The river 1A is different from the river 1 in that the ridge 14a and the ridge 14b are provided in the water channel 14 of the main channel 2A, and in the sub-channel 3A, the throttle portions 22a and 22b and the transport pipe 23a. , 23b and valves V2 and V3 are provided.

  In the main flow path 2A of the river 1A, a ridge part 14a and a ridge part 14b are provided as places where the water depth of the water channel 14 becomes deep. The eaves part 14a and the eaves part 14b are parts where the water channel 14 is curved, and the water depth is deeper outside in the radial direction. Since the flow velocity of the water flow is reduced, the fine particle portion F2 tends to settle at the ridge portion 14a, and the fine particle portion F3 tends to settle at the ridge portion 14b. In the heel part 14a, the fine grain fraction F2 is accumulated at the bottom thereof, and in the heel part 14b, the fine grain fraction F3 is accumulated at the bottom thereof, so that a bottom environment is formed respectively. That is, the bottom part of the eaves part 14a comprises the sand settling part S2, and the bottom part of the eaves part 14b comprises the sand settling part S3. The sand settling parts S2 and S3 may be formed intentionally, or may be formed naturally by a water flow, for example. In short, the sand settling portions S2 and S3 may be any ones for transferring the fine particle portions F2 and F3 to the upstream side of the river 1A and re-supplying the fine particle portions F2 and F3.

  In the sub-flow channel 3A of the river 1A, the throttle portions 22a and 22b are basically configured in the same manner as the throttle portion 22. The transport pipes 23a and 23b are basically configured in the same manner as the transport pipe 23. The valves V2 and V3 are basically configured similarly to the valve V1.

  The throttle part 22a and the throttle part 22b are provided on the flowing water pipe 20b (pressure feeding flow path of the flowing water part 20). The throttle portion 22a is provided on the downstream side of the pressure feed pump 21 in the sub-flow channel 3A. The restricting portion 22 a is provided on the downstream side of the restricting portion 22 a in the sub-flow channel 3 </ b> A and on the upstream side of the restricting portion 22. The throttle unit 22a and the throttle unit 22b generate negative pressure by using the water pumped by the pumping pump 21 through the water flow pipe 20b. A transport pipe 23a is connected to a location where the flow path of the throttle portion 22a is throttled (a location where the water pressure decreases). A transport pipe 23b is connected to a location where the flow path of the throttle portion 22b is throttled (a location where the water pressure decreases).

  The transport pipe 23a connects the sand settling part S2 and the throttle part 22a. The transport pipe 23b connects the sand settling part S3 and the throttle part 22b. That is, the transport pipes 23, 23a, and 23b serve as negative pressure transmission paths that are independent of each other. Accordingly, the fine particles F2 of the sand settling part S2 are sucked by the negative pressure generated in the throttle part 22a. Fine particles F3 of the sand settling part S3 are sucked by the negative pressure generated in the throttle part 22b.

  The valve V2 is liquid-tightly provided on the transport pipe 23a (negative pressure transmission path). The valve V3 is liquid-tightly provided on the transport pipe 23b (negative pressure transmission path). Therefore, it is possible to independently adjust the flow rate of the water and fine particle portion F2 flowing through the transport pipe 23a and the flow rate of the water and fine particle portion F3 flowing through the transport tube 23b.

  As shown in FIG. 6B, the river 1B includes a main flow path 2B and a sub flow path 3B. In the river 1B, the main flow path 2B is configured similarly to the main flow path 2A. In the river 1B, the sub flow channel 3B is provided with a throttle portion 22c instead of the throttle portions 22a and 22b, a transport pipe 23c instead of the transport pipes 23a and 23b, and a valve V2 with respect to the sub flow channel 3A. , V3 is different in that a valve V4 is provided.

  In the secondary flow path 3B of the river 1B, the throttle portion 22c is basically configured in the same manner as the throttle portion 22. The transport pipe 23c is basically configured in the same manner as the transport pipe 23 on the throttle portion 22 side. The valve V4 is basically configured similarly to the valve V1.

  The throttle part 22c is provided on the flowing water pipe 20b (pressure feeding flow path of the flowing water part 20). The throttle portion 22 c is provided on the downstream side of the pressure feed pump 21 in the sub-flow channel 3 </ b> B and on the upstream side of the throttle portion 22. The throttling part 22c generates negative pressure using water pumped by the pumping pump 21 via the water flow pipe 20b. A transport pipe 23c is connected to a location where the flow path of the throttle portion 22c is throttled (a location where the water pressure decreases).

  The transport pipe 23c connects the sand settling part S2 and the sand settling part S3 and the throttle part 22c. The transport pipe 23c is branched on the sand settling part S2 side and the sand settling part S3 side, and is connected to the sand settling part S2 and the sand settling part S3, respectively. That is, the transport pipe 23c is a negative pressure transmission path common to the two sand settling portions S2 and S3. Accordingly, the fine sand fraction S2 and the fine sand fraction F3 of the sand settling part S3 are sucked by the negative pressure generated in the throttle part 22c.

  The valve V4 is liquid-tightly provided on the transport pipe 23c (negative pressure transmission path). Therefore, the water flowing through the transport pipe 23c and the flow rates of the fine particle portion F2 and the fine particle portion F3 are collectively adjusted. Therefore, the number of parts of the transport pipe and the valve can be reduced.

As described above, in the rivers 1A and 1B to which this transfer method is applied, the fine fractions F1 to F3 are accumulated at the bottoms (sand sedimentation parts S1 to S3) at a plurality of locations of the rivers 1A and 1B. Therefore, in this transfer method, in the third step, the fine particles F1 to F3 are passed through the transport pipes 23, 23a, 23b, and 23c that connect the sand settling parts S1 to S3 and the throttle parts 22, 22a, 22b, and 22c. Suction. In this case, the fine particles F1 to F3 accumulated in a plurality of locations in the rivers 1A and 1B are drawn upstream of the rivers 1A and 1B by sucking the fine particles F1 to F3 in each of the sand settling parts S1 to S3. It can be easily transferred.
[Second Modification]

  In the said embodiment, water was circulated in the river 1 by pumping water from the pond part 15 to the pond part 11, but it is not necessary to circulate water in the said river. For example, the transfer method according to the present invention can be applied to a river 1C as shown in FIG.

  The river 1C includes a main channel 2C and a sub channel 3C. The river 1C is different from the river 1 in that a drainage channel 15x is provided instead of the introduction pipe 20a in the pond portion 15 of the main flow path 2C, and a pumping pump 21 is connected to the water source via the introduction pipe 20d in the sub-flow path 3C. 30 is different in that it is connected to 30.

  In the river 1C, the water from the water source 30 is supplied to the pond part 11 by the pumping pump 21 via the flowing water part 20, flows to the downstream side in the main flow path 2C, and then drained without being introduced into the sub flow path 3C. The That is, in the river 1C, water does not circulate in the river 1C.

  Even in such a river 1C, according to this transfer method, in the first step, the water of the water source 30 is passed upstream of the river 1 through the flowing water section 20 (introducing pipe 20d, flowing water pipe 20b, and flowing water pipe 20c). To pump. Subsequently, in the second step, the water pumped through the flowing water section 20 is used, and the constricted section 22 provided on the pumping flow path of the flowing water section 20 (between the flowing water pipe 20b and the flowing water pipe 20c) is shaded. Generate pressure. Subsequently, by using the negative pressure generated in the squeezing part 22, in the third step, the fine particle fraction F <b> 1 is obtained via the transport pipe 23 that connects the bottom part (sedimentation part S <b> 1) of the river 1 and the squeezing part 22. Suction. And in a 4th process, the fine particle fraction F1 attracted | sucked through the transport pipe 23 is transferred to the upstream of the river 1 with the water pumped through the flowing water part 20 (flowing water pipe 20c).

  In this way, a negative pressure is generated in the constricted portion 22 provided on the pumping flow path, the fine particle portion F1 is sucked using this negative pressure, and the fine particle portion F1 sucked together with the pumped water is taken up in the river 1 In order to transfer to the upstream side, in the river 1C, water does not circulate in the river 1C, but the fine fraction F can be circulated in the river 1C. Therefore, it becomes possible to easily transfer the fine particle portion F1 to the upstream side of the river 1 while reducing the possibility of damaging the organisms that the fine particle portion F1 may contain.

  1, 1A, 1B, 1C ... River, 2, 2A, 2B, 2C ... Main flow path, 3, 3A, 3B, 3C ... Sub flow path, 10 ... Discharge port, 11, 13, 15 ... Pond, 12, 14 ... Water channel, 20 ... flowing water part (flow water pipe), 21 ... pressure pump (pump), 22, 22a, 22b, 22c ... throttle part, 23, 23a, 23b, 23c ... transport pipe (transmission path), 30 ... water source, F1 , F2, F3 ... fine grain, G ... ground, M ... earth, S1, S2, S3 ... sand settling part, V1, V2, V3, V4 ... valve.

Claims (5)

A transfer method for transferring fine particles accumulated at the bottom of a river upstream from the bottom of the river,
A first step of pumping the water of the second region to the first region via a water pipe connecting the first region upstream of the river and the second region downstream of the river;
A second step of generating a negative pressure at a throttle portion provided on a pumping flow path of the flowing water pipe using the water pumped through the flowing water pipe;
Using the negative pressure generated in the throttle part, a third step of sucking the fine particles through a transport pipe connecting the bottom of the river and the throttle part;
A fourth step of transferring the fine particles sucked through the transport pipe to the first region upstream from the bottom of the river together with the water pumped through the water pipe. .   The transfer method according to claim 1, further comprising a fifth step of adjusting an amount of the fine particles sucked in the third step.   The transfer method according to claim 2, wherein an amount of the fine particles sucked in the fifth step is adjusted by a valve provided on the negative pressure transmission path. The transfer method according to any one of claims 1 to 3, wherein in the first step, the water in the second region is pumped to the first region by a pump. The fine grain fraction is accumulated at the bottom of the river at a plurality of locations,
In the third step, to suck the fine fraction through the transport pipe for connecting the throttle portion and put that bottom portion to the plurality of locations of the river, to any one of claims 1 to 4 The transfer method described.

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