JP2015067981A - Dredging system of dam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dredging system of a dam capable of continuing dredging work even when clogging is caused in a dredging discharge pipe, and capable of reducing a work burden for eliminating the clogging.SOLUTION: A dredging system 100 of a dam comprises a first drain pipe 110 and a second drain pipe 120 extending between a dam lake L and the downstream side of the dam D. A suction pump 112 is provided in a suction port 111 of the first drain pipe 110. The first drain pipe 110 and the second drain pipe 120 are mutually communicated by communication parts 130a-130c. On-off valves 140, 141a, 141b, 142a, 142b, 143a and 143b are provided respectively just behind suction ports 111 and 121 in the first drain pipe 110 and the second drain pipe 120, respectively just before drain ports 113 and 122 and respectively on the downstream side of the communication parts 130b and 130c, and open valves 150a-150d are provided in the respective highest places.

Description

  The present invention relates to a dredging system for a dam that removes sediment such as earth and sand, mud, or dust collected on the bottom of a dam lake.

  Conventionally, a dam dredging system has been proposed that is used for dredging work to remove sediments such as sediment, mud, or dust collected on the bottom of the dam lake in order to secure various functions such as dam water storage function and power generation function. . For example, in Patent Documents 1 and 2 below, a dredging discharge pipe is provided between the dam lake side and the downstream side of the dam, and water in the dam lake is introduced into the discharge pipe to fill the discharge pipe with water. A dam dredging system with a water conduit for operating the principle of siphon is disclosed respectively.

JP-A 61-45721 JP-A 61-246410

  However, in the dam dredging system described in Patent Documents 1 and 2, dredging work cannot be continued if sediment sucked from the dam lake is clogged in the suction port or pipe of the dredging discharge pipe. At the same time, there is a problem that the work of eliminating the clogging of the discharge pipe is extremely difficult and complicated.

  The present invention has been made to cope with the above problem, and its purpose is to continue the dredging operation even when the dredging pipe is clogged and to reduce the work load to eliminate the clogging. The aim is to provide a dam dredge system that can do.

  In order to achieve the above object, the present invention is characterized in that the first drain pipe provided extending from the dam lake formed by the dam to the downstream side of the dam and the dam lake in the first discharge pipe. A water absorption pump that is provided in a portion to be disposed and absorbs the water of the dam lake, a second drain pipe that extends along with the first drain pipe from the vicinity of the bottom of the dam lake to the downstream side of the dam, A communication part for communicating the first drain pipe and the second drain pipe with each other and at least downstream of the communication part of the first drain pipe and the second drain pipe to open and close the pipe line There is an on-off valve to perform.

  According to the characteristic of this invention comprised in this way, the 1st drain pipe and the 2nd drain pipe are each extended and provided in the dam dredging system between the dam lake and the downstream of a dam. In addition, since the first discharge pipe and the second discharge pipe communicate with each other through the communication portion, the dredging operation should be continued using the other discharge pipe even when one of the discharge pipes is clogged. Can do. In the dam dredging system according to the present invention, since the on / off valves are provided at least downstream of the communicating portions in the first discharge pipe and the second discharge pipe, the on / off valves are appropriately opened / closed. Therefore, the water in the second discharge pipe can be caused to flow backward to eliminate clogging. As a result, according to the dredging system of the dam according to the present invention, dredging can be continued even if clogging occurs in the drainage pipe for dredging, and the work load for eliminating clogging can be reduced. Can do.

  Another feature of the present invention is that, in the dredging system of the dam, the communication portion is provided at a plurality of positions from the upstream side to the downstream side of the first drain pipe and the second drain pipe, It exists in each being provided in the downstream of the at least 1 communication part of several communication parts.

  According to another feature of the present invention configured as described above, in the dam dredging system, the communication portions are provided at a plurality of positions from the upstream side to the downstream side of the first drain pipe and the second drain pipe. Therefore, the distribution route can be changed more finely according to the place where the clogging has occurred, and it is possible to cope with the case where clogging occurs at a plurality of places.

  Another feature of the present invention is that in the dredging system of the dam, there is provided an open valve for extracting air in each pipe at the highest position in the first drain pipe and the second drain pipe.

  According to another feature of the present invention thus configured, the dredging system of the dam is provided with an open valve for extracting air in each pipe at the highest point in the first drain pipe and the second drain pipe. Therefore, the air in the first drain pipe and the second drain pipe can be smoothly discharged to allow the principle of siphon to act.

  Another feature of the present invention resides in that the dam dredge system includes a control device for controlling the operations of the water suction pump and the on-off valve.

  According to another feature of the present invention configured as described above, the dredging system of the dam includes a control device that controls the operations of the water suction pump and the on-off valve, so that the dredging operation itself and the first discharge pipe In addition, it is possible to smoothly and easily perform clogging elimination work when the second discharge pipe is clogged.

  Another feature of the present invention is that, in the dredging system of the dam, the on-off valve is provided in the communication portion.

  According to another feature of the present invention configured as described above, the dam dredging system can separate the first discharge pipe and the second discharge pipe through the communication portion, so that a plurality of on-off valves can be appropriately opened and closed. Thus, the water in the first discharge pipe is caused to flow back into the second discharge pipe, and the deposit M clogged in the first discharge pipe and / or the second discharge pipe is pushed out to the suction port of the second discharge pipe. Can be discharged.

It is sectional drawing which showed typically the outline of the physical system structure of the dam dredging system which concerns on one Embodiment of this invention. It is a block diagram which shows the outline of a control system structure of the dam dredging system shown in FIG. FIG. 2 is a cross-sectional view schematically showing a state where a clogging operation is continued by bypassing a clogged portion when clogging occurs in the dam dredging system shown in FIG. 1. It is sectional drawing which showed typically the outline of the physical system structure of the dam dredging system which concerns on the modification of this invention.

  Hereinafter, an embodiment of a dam dredging system according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing an outline of a physical system configuration of a dam dredge system 100 according to the present invention (hereinafter, simply referred to as “dredging system 100”). FIG. 2 is a block diagram showing an outline of a control system configuration of the dam dredge system 100 shown in FIG. This dredging system 100 is a mechanical device for removing sediment M such as earth and sand, mud or dust accumulated on the bottom of the dam lake L formed by the dam D.

(Configuration of cocoon system 100)
The dredge system 100 includes a first drain pipe 110 and a second drain pipe 120, respectively. The first drain pipe 110 is a pipe for guiding the water and sediment M in the dam lake L to the outside of the dam lake L, and is formed to extend between the dam lake L and the downstream side of the dam D. Yes. The first discharge pipe 110 is configured by a flexible plastic pipe having a portion disposed in the dam lake L and is supported by the dredger work ship 160, and is upstream of the dredger work ship 160. A portion hangs down in the dam lake L and a portion downstream from the dredger work ship 160 is provided on the surface of the dam lake L in a state of being floated by a float body (not shown).

  In this case, the part arrange | positioned in the dam lake L in the 1st discharge pipe 110 is comprised so that expansion-contraction is respectively possible with respect to the lake bottom side and the dam D side from the dredger work ship 160. A water suction pump 112 is provided at the suction port 111 that opens at the tip of the first discharge pipe 110 in the dam lake L. The water absorption pump 112 is a mechanical device for pumping up the water of the dam lake L. In the present embodiment, the water absorption pump 112 is configured to be capable of sucking soil and mud in addition to the water of the dam lake L. The operation of the water absorption pump 112 is controlled by a control device 170 described later.

  On the other hand, as for the 1st discharge pipe 110, the downstream part from the part arrange | positioned in the dam lake L is comprised by the pipe made from FRP, and it is being fixed to the wall surface of the dam D toward the downstream of the dam D. ing. In this case, the part arrange | positioned in the dam lake L in the 1st discharge pipe 110 and the part fixed to the wall surface of the dam D are mutually connected detachably. In addition, the tip of the first discharge pipe 110 on the side fixed to the dam D has a discharge port 113 opened to discharge water or sediment M sucked from the dam lake L to the downstream side of the dam D. Is formed.

  The second drain pipe 120 is a pipe for guiding the water and sediment M in the dam lake L to the outside of the dam lake L, and the first drain pipe between the dam lake L and the downstream side of the dam D. 110 extends along the line 110. Similar to the first drain pipe 110, the second drain pipe 120 is supported by the dredger 160 with a flexible resin-made flexible pipe disposed in the dam lake L. The upstream part of the dredging work ship 160 is suspended in the dam lake L, and the downstream part of the dredging work ship 160 is provided on the surface of the dam lake L in a state of being floated by a float body (not shown).

  In this case, the part arrange | positioned in the dam lake L in the 2nd discharge pipe 120 is comprised so that expansion-contraction is respectively possible with respect to the lake bottom side and the dam D side from the dredger work ship 160. Further, a suction port 121 that opens to suck the sediment M from the bottom of the dam lake L is formed at the tip of the second discharge pipe 120 in the dam lake L. The suction port 121 is formed by obliquely cutting the tube body so that the deposit M can be sucked easily.

  On the other hand, as with the first discharge pipe 110, the second discharge pipe 120 is configured by a FRP pipe at the downstream side of the part disposed in the dam lake L, and is downstream of the dam D. It is being fixed to the wall surface of the dam D toward. In this case, the part arrange | positioned in the dam lake L in the 2nd discharge pipe 120 and the part fixed to the wall surface of the dam D are mutually connected detachably. Further, a discharge port 122 opened to discharge the sediment M sucked from the dam lake L to the downstream side of the dam D is formed at the tip of the second discharge pipe 120 fixed to the dam D. Has been.

  The first discharge pipe 110 and the second discharge pipe 120 communicate with each other through a plurality of communication portions 130a, 130b, and 130c. The communication portions 130a, 130b, and 130c are connected to the first discharge pipe 110 and the first discharge pipe 110 and the second discharge pipe 120 between the first discharge pipe 110 and the second discharge pipe 120, respectively. This is a part for communicating the two discharge pipes 120 with each other, and is composed of a tube similar to the first discharge pipe 110 and the second discharge pipe 120. In this case, each communication part 130a, 130b, 130c is mutually connected with respect to the 1st discharge pipe 110 and the 2nd discharge pipe 120 through the joint which is not illustrated, respectively. Therefore, in the present embodiment, the first discharge pipe 110 and the second discharge pipe 120 are configured to be detachable on the upstream side and the downstream side with the communication portions 130a to 130c as boundaries.

  In this embodiment, each communication part 130a, 130b, 130c is the part arrange | positioned in the dam lake L upstream from the dredging work ship 160 in the 1st discharge pipe 110 and the 2nd discharge pipe 120, the dredging work ship 160. And a portion disposed on the water surface of the dam lake L between the dam D and a portion disposed along the wall of the dam D, respectively.

  Further, immediately after the suction port 121 in the second discharge pipe 120, immediately before the discharge ports 113 and 122 in the first discharge pipe 110 and the second discharge pipe 120, and downstream of the communication portions 130b and 130c, On-off valves 140, 141a, 141b, 142a, 142b, 143a, 143b are provided, respectively. The on-off valves 140, 141 a, 141 b, 142 a, 142 b, 143 a, and 143 b are in a state in which the water and sediment M in the dam lake L can be circulated in the first discharge pipe 110 and the second discharge pipe 120. A valve that can be selectively switched between possible states. These on-off valves 140, 141a, 141b, 142a, 142b, 143a, and 143b are controlled to be opened and closed by a controller 170 described later. That is, each on-off valve 140, 141a, 141b, 142a, 142b, 143a, 143b is constituted by an electromagnetic valve in this embodiment.

  An opening valve 150a is provided in a portion of the first discharge pipe 110 and the second discharge pipe 120 on the dredger 160 and a portion of the first discharge pipe 110 and the second discharge pipe 120 that straddles the dam D. To 150d are provided. The release valves 150a to 150d are used to evacuate the air in the first exhaust pipe 110 and the second exhaust pipe 120 in order to apply the siphon principle in the first exhaust pipe 110 and the second exhaust pipe 120. It is a solenoid valve. The opening / closing operations of the release valves 150a to 150d are controlled by the control device 160, respectively.

  The dredger work ship 160 is a ship for moving the suction ports 111 and 121 in the first discharge pipe 110 and the second discharge pipe 120 in the dam lake L. The dredger work ship 160 can freely move on the dam lake L while feeding or winding up the first discharge pipe 110 and the second discharge pipe 120 by the operation of an operator (not shown). The dredger work ship 160 is provided with a control device 170.

  The control device 170 is configured by a microcomputer including a CPU, a ROM, a RAM, and the like, and each of the water absorption pump 112, the on-off valves 140, 141a, 141b, 142a, 142b, 143a, 143b, and the open valves 150a to 150d. Control each operation. Specifically, the control device 170 executes a control program stored in advance in a storage device such as a ROM in accordance with an operation of an operation element 171 to be described later, whereby the water suction pump 112 and the on-off valves 140, 141a, 141b, Each operation of 142a, 142b, 143a, 143b and each open valve 150a-150d is controlled, respectively.

  An operator 171 and a display device 172 are connected to the control device 170, respectively. The operation element 171 is an input device for inputting an operator's instruction to the control device 170, and includes the water absorption pump 112, the on-off valves 140, 141a, 141b, 142a, 142b, 143a, 143b, and the open valves 150a. It is comprised by the push button for instruct | indicating each action of -150d. The display device 172 is a liquid crystal display screen for displaying the operating state of the control device 170. In addition to the control device 170, the dredger work ship 160 supplies power to the control device 170, the water absorption pump 112, the on-off valves 140, 141a, 141b, 142a, 142b, 143a, 143b, and the open valves 150a to 150d. A power supply unit (not shown) for supplying each of them is also provided. However, these are not directly related to the present invention, and the description thereof is omitted.

(Operation of dredging system 100)
Next, the operation of the soot system 100 configured as described above will be described. First, an operator who performs dredging work in the dam lake L of the dam D places the dredger work ship 160 at a work site where dredging work is performed in the dam lake L. In this case, the worker sends the first discharge pipe 110 and the second discharge pipe 120 between the dredger work ship 160 and the dam D as the dredger work ship 160 moves, and the first discharge pipe 110 and A second discharge pipe 120 is disposed.

  Next, the operator inserts the suction ports 111 and 121 side of the first discharge pipe 110 and the second discharge pipe 120 into the dam lake L, respectively. In this case, the operator positions the suction port 111 at a position sufficiently away from the bottom of the dam lake L for the first discharge pipe 110. In addition, the operator positions the suction port 121 at a depth near the bottom of the dam lake L for the second discharge pipe 120.

  Next, an operator sends the water of the dam lake L to the downstream side of the dam D using the principle of siphon. Specifically, the operator opens the on-off valves 141a, 141b, 142a, 142b and the open valves 150a-150d through the control device 170 by operating the operation element 171, and opens the on-off valves 140, 143a, 143b, respectively. After each closing, the operation of the water absorption pump 112 is started via the control device 170 by operating the operation element 171.

  Thereby, the water sucked from the dam lake L is introduced as priming water into each of the first discharge pipe 110 and the second discharge pipe 120. In this case, since the first discharge pipe 110 and the second discharge pipe 120 are provided with release valves 150a to 150d at high places on the path, respectively, the first discharge pipe 110 and the second discharge pipe The air in each of the 120 pipes is discharged from the open valves 150a to 150d as the priming water is filled.

  Therefore, when water is ejected from the open valves 150a and 150b at the highest position among 150a to 150d, the worker uses priming water in each of the first discharge pipe 110 and the second discharge pipe 120. By operating the operation element 171 as being satisfied, the release valves 150a to 150d are closed through the control device 170, and the on-off valves 140 and 143b are opened. Thereby, in the second discharge pipe 120, the water absorbed by the water absorption pump 112 and the water absorbed by the siphon principle are circulated and discharged from the discharge port 122, respectively. Next, the operator operates the operation element 171 to stop the operation of the water absorption pump 112, so that the water of the dam lake L is discharged to the downstream side of the dam D through the second discharge pipe 120 only by the principle of siphon. Let

  Next, the worker starts dredging work on the dam lake L. Specifically, the operator brings the suction port 121 of the second discharge pipe 120 close to the deposit M deposited on the bottom of the dam lake L. Thereby, the deposit M deposited on the bottom of the dam lake L is sucked from the suction port 121 of the second discharge pipe 120 together with the water of the dam lake L, and then is discharged through the second discharge pipe 120. Discharged from. Therefore, the worker can perform dredging work in the dam lake L by moving the position of the suction port 121 on the bottom of the dam lake L.

  During such dredging work, the suction port 121 of the second discharge pipe 120 or the pipe between the suction port 121 and the discharge port 122 is clogged, and hinders smooth suction and discharge of the deposit M. May occur. In this case, the worker can perform the clogging elimination work when the suction port 121 of the second discharge pipe 120 is clogged, and can continue the dredging work when clogging occurs in the pipe. it can.

  When the suction port 121 of the second discharge pipe 120 (or between the communication section 130a in the second discharge pipe 120) is clogged, the operator sucks the water in the second discharge pipe 120. The clogging is eliminated by making the gas flow backward toward the mouth 121. Specifically, the operator closes the on-off valves 141 a and 141 b by operating the operation element 171 and starts the operation of the water absorption pump 112. Accordingly, the water introduced into the first discharge pipe 110 by the water absorption pump 112 flows into the second discharge pipe 120 through the communication holes 130a and 130b, and is guided toward the suction port 121. Then, the deposit M clogged in the suction port 121 can be pushed out to eliminate clogging. When the clogging of the suction port 121 is eliminated, the operator operates the operation element 171 to stop the operation of the water suction pump 112 and opens the on-off valves 141a and 141b to return to the original state.

  On the other hand, when clogging occurs in the second discharge pipe 120, the operator switches the second discharge pipe 120 used for the dredging work to the first discharge pipe 110. Specifically, the operator appropriately opens and closes the on-off valves 141a, 141b, 142a, 142b, 143a, and 143b in accordance with the location where the clogging occurs, and secures a flow path for the deposit M sucked from the suction port 121. To be discharged from the discharge port 113 and / or the discharge port 122.

  For example, as shown in FIG. 3, when clogging T <b> 1 occurs in the pipe between the communication part 130 b and the communication part 130 c in the second discharge pipe 120, the operator opens and closes by operating the operating element 171. The on-off valves 141b and 142a are closed while the valves 141a and 142b are opened. Accordingly, the deposit M sucked from the suction port 121 of the second discharge pipe 120 flows into the first discharge pipe 110 through the communication portions 130a and 130b, and opens and closes the inside of the first discharge pipe 110. After being led to just before the valve 142a, it is led to the second discharge pipe 120 via the communication portion 130c and discharged from the discharge port 122 via the on-off valve 142b. That is, the dredging system 100 guides the deposit M to the downstream side of the dam D while avoiding the pipe line between the on-off valve 141b and the on-off valve 142b in the second discharge pipe 120 (in other words, bypassing). be able to.

  In this case, the operator operates the operating element 171 to open at least the on-off valve 141a and close the on-off valve 141b in addition to opening or closing the on-off valve 142b. 142a may be opened. According to this, the deposit M sucked from the suction port 121 of the second discharge pipe 120 flows into the first discharge pipe 110 through the communication portions 130a and 130b, and enters the first discharge pipe 110. Is discharged from the discharge port 113 through the on-off valve 142a as it is, or is led to the second discharge pipe 120 through the communication portion 130c and discharged through the on-off valve 142b. It is discharged from 122.

  Further, in these cases, the operator bypasses the conduit between the on-off valve 141b and the on-off valve 142b in the second discharge pipe 120, while the conduit between the on-off valve 141b and the on-off valve 142b. Can be removed from the second discharge pipe 120 to eliminate clogging T1 and the pipe in the same section can be replaced with a new one. In FIG. 3, the clogs T1 to T3 are exaggerated and the closed states of the on-off valves 141b and 142a are filled in.

  Further, for example, when clogging T2 occurs in the pipe between the communication portion 130a and the communication portion 130b in the second discharge pipe 120, the deposit M sucked from the suction port 121 of the second discharge pipe 120. Flows into the first discharge pipe 110 through the communication portion 130a and then is discharged downstream of the dam D through the first discharge pipe 110 and / or the second discharge pipe 120 after the communication portion 130b. .

  Further, for example, when clogging T3 occurs in the pipes after the communication part 130c in the second discharge pipe 120, the deposit M sucked from the suction port 121 of the second discharge pipe 120 passes through the communication part 130c. Then, after flowing into the first discharge pipe 110, it is discharged from the discharge port 113 through the on-off valve 142a. Thus, the operator can continue the dredging work by selecting the pipes through which the deposit M flows by appropriately opening and closing each of the on-off valves 141a, 141b, 142a, 142b.

  Then, when finishing the dredging work in the dam lake L, the operator operates the operation element 171 to close the on-off valve 140. Thereby, the dredging system 100 can interrupt dredging work because the inflow of water, sediment M, and air into the first discharge pipe 110 and the second discharge pipe 120 is stopped. In this case, the operator can also interrupt the dredging work by closing the on-off valves other than the on-off valve 140, specifically, the on-off valves 141a, 141b, 142a, 142b, 143a, 143b. Further, the operator raises the suction ports 111 and 121 of the first discharge pipe 110 and the second discharge pipe 120 to the dam lake L or operates the operation element 171 to open the release valves 150 to 150d. By introducing air into each of the first discharge pipe 110 and the second discharge pipe 120, the siphon principle can be eliminated and the dredging operation can be interrupted.

  As can be understood from the above description of operation, according to the embodiment, the dredging system 100 is hung between the dam lake L and the downstream side of the dam D, and the first drain pipe 110 and the second drain pipe 120. And the first discharge pipe 110 and the second discharge pipe 120 communicate with each other via the communication portions 130a to 130c, so that one of the discharge pipes is clogged. Also, the dredging operation can be continued using the other discharge pipe. Further, in the dredging system 100 according to the present invention, the on-off valves 140, 141a, 141b, 142a, 142b, downstream of the plurality of communication portions 130b, 130c in the first discharge pipe 110 and the second discharge pipe 120 are provided. Since 143a and 143b are respectively provided, the water in the second discharge pipe 120 is caused to flow backward by appropriately opening and closing these on-off valves 140, 141a, 141b, 142a, 142b, 143a, and 143b. Clogging can be eliminated. As a result, according to the dredging system 100 of the dam according to the present invention, the dredging operation can be continued even when each discharge pipe is clogged, and the work load for eliminating clogging can be reduced. it can.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

  For example, in the above embodiment, the sediment M of the dam lake L is discharged to the downstream side of the dam D using the second discharge pipe 120. However, the dredging system 100 can also perform dredging work using the first discharge pipe 110 by continuing to operate the water absorption pump 112 that has absorbed the priming water. In this case, when the first discharge pipe 110 is clogged, the operator operates the operation element 117 to appropriately open and close the on-off valves 140, 141a, 141b, 142a, 142b, 143a, 143b, and the deposit M. The dredging operation can be continued by switching the distribution route from the first discharge pipe 110 to the second discharge pipe 120.

  Moreover, in the said embodiment, the dredging system 100 comprised the open valves 150a-150d in the 1st discharge pipe 110 and the 2nd discharge pipe 120, respectively. However, the dredging system 100 is provided at least at the highest points of the first discharge pipe 110 and the second discharge pipe 120 (in this embodiment, the open valves 150c and 150b installed at the place across the dam D). Just do it.

  Moreover, in the said embodiment, the dredging system 100 is provided with the control apparatus 170 which controls each operation | movement of the water absorption pump 112 and the on-off valves 140, 141a, 141b, 142a, 142b, 143a, 143b comprehensively. However, the dredging system 100 may be configured such that the water absorption pump 112 and the on-off valves 140, 141a, 141b, 142a, 142b, 143a, and 143b are individually provided with the operation elements 171 to control their operations individually. The valves 140, 141a, 141b, 142a, 142b, 143a, 143b may be configured by valves that can be manually opened and closed.

  Moreover, in the said embodiment, the gutter system 100 comprised the on-off valve 140,141a, 141b, 142a, 142b, 143a, 143b. However, the on-off valves 140, 141 a, 141 b, 142 a, 142 b, 143 a, and 143 b are provided on the downstream side of at least one of the communication portions 130 a to 130 b in the first discharge pipe 110 and the second discharge pipe 120. Just do it. Therefore, for example, the dredge system 100 can be configured by omitting the on-off valve 140, and the on-off valve 140 can be provided immediately after the water absorption pump 112 in the first discharge pipe 110.

  The on-off valves can be provided in the communication portions 130a to 130c themselves instead of or in addition to the on-off valves 141a, 141b, 142a, 142b. For example, as shown in FIG. 4, in addition to the on-off valves 141a, 141b, 142a, 142b, the on-off valves 180a, 180b, 180c can be provided in the communication portions 130a-130c, respectively. According to this, since the 1st discharge pipe 110 and the 2nd discharge pipe 120 can be isolate | separated via on-off valve 180a, 180b, 180c, the 1st discharge pipe 110 is opened and closed by opening and closing a some on-off valve suitably. Water in the second discharge pipe 120 is caused to flow backward to press the clogging in the first discharge pipe 110 and / or the second discharge pipe 120 toward the suction port 121 side of the second discharge pipe 120. Can do. In this case, the operator pushes the clogging generated in the first discharge pipe 110 and / or the second discharge pipe 120 toward the suction ports 111 and 121 by opening and closing the opening / closing valve as appropriate, or discharges the 113 , 122 can be removed by clogging, and the suction ports 111 and 121 or the discharge ports 113 and 122 can also be discharged to the outside.

  Moreover, in the said embodiment, the gutter system 100 comprised the three communication parts 130a-130c. However, the number of the communication portions 130a to 130c is not necessarily limited to the above-described embodiment as long as one or more in the first discharge pipe 110 and the second discharge pipe 120 are provided.

D ... Dam, L ... Dam lake, M ... Sediment, T1-T3 ... Clogged,
100 ... Sakai system,
110 ... first discharge pipe, 111 ... suction port, 112 ... water absorption pump, 113 ... discharge port,
120 ... second discharge pipe, 121 ... suction port, 122 ... discharge port,
130a-130c ... a communication part,
140, 141a, 141b, 142a, 142b, 143a, 143b ... on-off valve,
150a-150d ... open valve,
160 ... dredgers,
170 ... control device, 171 ... operator, 172 ... display device,
180a-180c ... Open / close valve.

Claims (5)

A first drain pipe provided extending from the dam lake formed by the dam to the downstream side of the dam;
A water absorption pump that is provided in a portion of the first discharge pipe disposed in the dam lake and absorbs the water of the dam lake;
A second drainage pipe provided with the first drainage pipe from the vicinity of the bottom of the dam lake to the downstream side of the dam;
A communicating portion for communicating the first drain pipe and the second drain pipe with each other;
A dam dredge system comprising at least an on-off valve provided on the downstream side of the communicating portion in the first drain pipe and the second drain pipe for opening and closing the pipe line. In the dam dredging system according to claim 1,
The communication part is
Provided at a plurality of positions from the upstream side to the downstream side of the first drain pipe and the second drain pipe,
The on-off valve is
A dam dredging system, wherein the dam dredging system is provided downstream of at least one of the plurality of communication portions. In the dam dredging system according to claim 1 or claim 2,
A dam dredging system comprising an open valve for extracting air from each pipe at the highest point of the first drain pipe and the second drain pipe. In the dam dredging system according to any one of claims 1 to 3,
A dam dredge system comprising a control device for controlling each operation of the water absorption pump and the on-off valve. In the dam dredging system according to any one of claims 1 to 4,
The dam dredge system, wherein the on-off valve is provided in the communication portion.

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