JP2010144359A - Suction pipe for flow-transporting underwater sediment, flow-transport apparatus for underwater sediment, and method for flow-transporting underwater sediment using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device flow-transporting an underwater sediment accumulated at the bottom of water, efficiently in bulk while being attainable in a simple structure without needing large-scale facilities and power, and to provide a suction pipe. <P>SOLUTION: The suction pipe 5 opened at both ends has one end formed as a water intake 2a and the other end formed as a connection end 51 on the discharge port side. An intermediate part between both ends is formed with a folded part 52, and a lower part of a pipe with the folded part is notched. A flexible sheet member that can follow the change of surface shape of the underwater sediment is bonded to the notched part. The sheet member is provided with a plurality of bottom face suction holes bored communicating with the inside of the pipe to suck the underwater sediment, and a side face part of the suction pipe 5 is provided with a side face suction hole bored communicating with the inside of the pipe to suck the underwater sediment. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a suction pipe for sending an underwater sediment stream for sucking an underwater sediment deposited on the bottom of a closed water area together with water and feeding it to other areas such as a downstream area, and the suction pipe The present invention relates to an underwater sediment feeding apparatus including the above-described apparatus, and an underwater sediment feeding method using the apparatus.

  In water storage facilities such as dams, ponds, sewage treatment plants, and closed water areas such as natural rivers, lakes, ponds, and canals, sediment such as sediment settles on the bottom of the water, reducing the water storage function, In order to cause hindrance to ship operations, water quality, environmental pollution, etc., it is necessary to perform dredging work to remove and remove sediment accumulated on the bottom of the water periodically or as necessary.

  For example, in a dam reservoir where the river has been blocked for the purpose of flood control, water use, or power generation, earth and sand carried by the river from the upstream area will accumulate on the bottom of the dam, reducing the effective amount of water stored in the dam. In addition, the supply of earth and sand to the downstream area is reduced, and problems such as river bed deterioration and coastal erosion (sand beach thinning) occur in the downstream area.

  For this reason, conventionally, using a crane installed on a trolley or the like, the sediments and the like are crushed with a bucket or the like and pumped to the land, and transported to the downstream area from the river dam by land transportation means such as a truck. It was discharged or disposed of elsewhere. Alternatively, sedimentary sand and the like are sucked together with water by a dredging pump capable of sucking mud mixed with earth and sand and discharged to the downstream area. However, these dredging operations all require large-scale facilities and power, and there are problems such as difficult installation of the device itself and excessive costs in mountainous areas where transportation is not convenient. It was.

  In order to solve such a problem, Patent Document 1 discloses that a pipe with an opening is embedded in an underwater sediment, sediment, or accumulation, and the upstream end or the upstream opening is located in the water. As a result, the sediment, sediment or accumulation around the opening is sucked into the pipe by the negative pressure generated in the pipe as water entering from the opening in the upstream end or upstream water flows in the pipe. An underwater sediment inflow method, an apparatus thereof, and the like are disclosed.

  However, the underwater sediment flow feeding device described in Patent Document 1 is advantageous in that it does not require a very large facility or power, but it is necessary to embed an open pipe in the underwater sediment. There was a problem that it was difficult to apply to other dams.

  Further, in Patent Document 2 filed by the applicants of the present application, the opening 22 is placed on the earth and sand S on which the flexible scavenging pipe 21 having the opening 22 on the side surface is deposited, A suction pipe 28 is connected to the base end portion 21b of the sweep pipe 21, and a water flow is formed from the front end opening 21a to the base end portion 21b by the water flow forming means 29 to sweep the sediments S facing the opening 22 while sweeping the sediment. By sucking and transporting, the conical depression of the sediment earth S formed around the tip opening 21a of the scavenging tube 21 is allowed to follow with its flexibility, and due to the large sinking of the tip and collapse of the surrounding earth and sand. There is disclosed a method and apparatus for transporting bottom sediments that can be drained over a three-dimensional conical shape with a two-dimensional shaped scavenging tube 21 (see FIG. 1 of Patent Document 2). ).

  However, although the bottom sediment transport method and apparatus described in Patent Document 2 can economically transport sediment sediment using the difference in water level, (1) sediment sediment as the sediment suction progresses. A mortar-shaped depression is formed in the pit, etc., and earth and sand etc. collapse from the slope of this depression and the tip opening 21a, which is a water intake, is buried, and the tip opening 21a is closed to transport water flow and sedimentary earth and sand. I will stop. (2) Since the sheet-like member 34 is large, the sheet-like member 34 is lifted, bent, wrinkled, etc. as the earth and sand suction progresses, and a space is formed between the sheet-like member 34 and the accumulated earth and sand S. Becomes a water path, and the suction power of earth and sand is reduced. (3) There is a problem that it is difficult to expand the sheet-like member in water.

Japanese Patent Application Laid-Open No. 2002-294677 JP 2006-214092 A

  Therefore, the present invention solves the above-mentioned conventional problems, does not require large-scale facilities and power, can be realized with a simple structure, is easy to install, is economical and difficult to break, and depends on the weather. To provide a method for feeding underwater sediment, a device for the same, and a suction pipe capable of feeding underwater sediment deposited on the bottom of the water to other areas stably and efficiently in large quantities. Objective.

  In order to solve the above-mentioned problems, the invention of the suction pipe for transporting underwater sedimentary flow according to claim 1 is characterized in that the underwater sediment deposited on the bottom of the closed water area is sucked together with water to other areas. It is a suction pipe for transporting underwater sediments for flow, which is formed from a flexible tube with both ends open, one end being a water intake port that is a water intake port, and the other end being a discharge port A folded portion is formed by folding and fixing the pipe material at an intermediate portion between both ends, and a lower portion of the tubular material with the folded portion is cut out, and this cut portion is A sheet member having flexibility capable of following the change in the surface shape of the underwater deposit is bonded, and a plurality of bottom suction holes for sucking the underwater deposit communicate with the inside of the pipe member. And is folded above the sheet member. The then tip portion corresponding side portion of the tube material, the side suction hole for water deposits suction, characterized in that it is bored in communication with the tubing.

  The suction pipe for transporting underwater sediment according to claim 2 is the suction pipe according to claim 1, wherein the outer edge of the sheet member follows the change in the surface shape of the underwater sediment along the edge. It is characterized in that a weight having possible flexibility is provided.

  The suction pipe for transporting a submerged sediment according to claim 3 is the suction pipe according to claim 1 or 2, wherein the overhang length from the tip of the folded portion of the sheet member is the tube diameter of the pipe material. It is characterized by being 1/3 or less.

  The suction pipe for transporting an underwater sediment according to claim 4 is the suction pipe according to any one of claims 1 to 3, wherein the overhang length from the side surface portion of the folded portion of the sheet member is the pipe length. The length in the direction along the tube material of the sheet member is set to about 10 times the diameter of the tube material about twice the diameter.

  The suction pipe for transporting underwater sediment according to claim 5 is the suction pipe according to any one of claims 1 to 4, wherein the distance between the water intake and the side suction hole is the thickness of the underwater sediment. From the thickness and the angle of repose of the underwater sediment, the maximum shape of the mortar-shaped depression formed in the underwater sediment at the end of suction is calculated, and the slope length is calculated. It is set to be longer than the slope length.

  The suction pipe for transporting underwater sediments according to claim 6 is the suction pipe according to any one of claims 1 to 5, wherein a bent elbow pipe is connected to the intake port. The open end is installed upward.

  The invention of the apparatus for feeding underwater sediments according to claim 7 is characterized in that the underwater deposits are sucked together with the water and deposited to other areas by sucking the underwater sediments deposited on the bottom of the closed water area. It is an apparatus, Comprising: It has the suction pipe in any one of Claim 1 thru | or 6, and the water flow generation means to generate | occur | produce the water flow for attracting | sucking a submerged deposit in the pipe | tube of this suction pipe, It is characterized by the above-mentioned. .

  The invention of the method for transporting underwater sediments according to claim 8 uses the underwater sediment distribution transport device according to claim 7 to suck the underwater sediments deposited on the bottom of a closed water area together with water. A method for feeding an underwater deposit to be sent to another region, wherein the suction pipe according to any one of claims 1 to 6 is installed on the underwater deposit, and the suction pipe is used by the water flow generating means. A water flow is generated in the pipe and the suction pipe is negatively pressured by the water flow, thereby sucking underwater deposits together with water from the side suction hole and the bottom suction hole, and the suction pipe with the negative pressure. The tip of the water is submerged in the underwater deposit, and the underwater deposit is dredged while forming a mortar-shaped depression around the underwater deposit.

According to the first aspect of the present invention, as described above, the pipe is formed of a flexible tube having both ends opened, one end being a water intake port that is a water intake port, and the other end being a discharge port side. In the middle part of both ends, a folded part is formed by folding and fixing the pipe material, and the lower part of the pipe material with the folded part is notched, and the notched part has A sheet member having flexibility capable of following a change in the surface shape of the underwater deposit is bonded, and a plurality of bottom surface suction holes for sucking the underwater deposit communicate with the inside of the pipe member. In addition, a side suction hole for sucking underwater deposits is formed in the side part of the pipe member above the sheet member and corresponding to the tip part of the folded portion so as to communicate with the inside of the pipe member. In other words, a water intake was provided in addition to the sediment suction hole. As the underwater sediment suction progresses, a mortar-shaped depression is formed, and the deposit collapses from the slope of this depression, and a high-concentration deposit is removed at once from the side suction hole located at the tip of the suction pipe. Even in the case of clogging due to suction, water can always be taken from the intake port, so that the water flow in the pipe of the suction pipe does not stop. Therefore, the sediment can be sucked continuously until the central portion of the mortar-shaped depression reaches the water bottom. Therefore, it does not require large-scale facilities and power, can be realized with a simple structure, is easy to install, is economical and difficult to break, and is stable and efficient in large quantities underwater. Can be streamed.
In addition, even if the surface shape of the mortar-shaped depression that is formed in the underwater deposits is not smooth, it is covered with a sheet member that can follow the change of the surface shape, and the range of the covered range Underwater deposits can be efficiently sucked from the bottom suction hole by the negative pressure generated in the pipe of the suction pipe.

  According to the second aspect of the present invention, in the suction pipe for transporting the underwater sediment according to the first aspect, the outer edge of the sheet member can follow the change in the surface shape of the underwater sediment along the edge. In addition to the above-described effects, the flexible weight is arranged, so that the sheet member may be swollen or wrinkled due to a water flow flowing in a closed water area or a water flow generated during suction. In this case, a space is formed between the sheet member and the deposit, and the possibility that the suction force decreases due to the water becomes small. Moreover, the deployment of the sheet member in water can be naturally deployed without any effort due to the gravity of the weight.

  According to a third aspect of the present invention, in the suction pipe for transporting an underwater sedimentary flow according to the first or second aspect, the overhang length from the front end portion of the folded portion of the sheet member is 1 of the tube diameter of the pipe material. Therefore, in addition to the above effects, there is no possibility that the protruding portion from the tip end portion of the folded portion of the sheet member will be rolled up by the suction force of the side suction hole and block the side suction hole.

  According to a fourth aspect of the present invention, in the suction pipe for transporting a submerged sediment according to any one of the first to third aspects, the overhang length from the side surface portion of the folded portion of the sheet member is the diameter of the pipe material. The length of the sheet member in the direction along the tube material is set to about 10 times the diameter of the tube material, that is, the sheet member follows the change in the surface shape of the underwater deposit. In addition to the above effects, the underwater sediment can be more efficiently transported (transferred or discarded) because the suction pipe can keep maintaining the suction force and has an optimal size that does not prevent the suction pipe from entering the sediment. can do.

  According to the invention described in claim 5, in the suction pipe for transporting underwater deposits according to any one of claims 1 to 4, the distance between the water intake and the side suction hole is the thickness of the underwater deposit. The maximum shape of the mortar-shaped depression formed in the underwater sediment at the end of suction is calculated from the thickness and the angle of repose of the underwater sediment in advance, and the slope length is calculated. Since it is set to be longer than the length, that is, the intake pipe of the suction pipe is always installed outside the mortar-shaped depression that may collapse, so in addition to the above effects, the collapse The possibility of earth and sand clogging the water intake and the water flow in the pipe of the suction pipe is further reduced.

  According to a sixth aspect of the present invention, in the suction pipe for transporting an underwater sedimentary flow according to any one of the first to fifth aspects, a bent elbow pipe is connected to the water intake, and the opening of the elbow pipe Since the end is installed upward, in addition to the above-described effect, the possibility that clogged earth and sand will clog the intake port and the water flow in the pipe of the suction pipe is further reduced.

  According to the seventh aspect of the present invention, there is provided a device for feeding an underwater sediment, wherein the underwater sediment deposited on the bottom of a closed water area is sucked together with the water and is sent to another region. Since it has the suction pipe according to any one of Items 1 to 6 and a water flow generating means for generating a water flow for sucking underwater deposits in the pipe of the suction pipe, no large facility or power is required. It can be realized by a simple structure, is easy to install, is economical, is not easily broken, and can stably and efficiently flow (transfer or discard) a large amount of underwater sediments regardless of the weather. it can.

  According to the eighth aspect of the present invention, the underwater sediment distribution transport device according to the seventh aspect is used, and the underwater sediment deposited on the bottom of the closed water area is sucked together with the water to flow to other areas. A method for feeding underwater sediment to be sent, wherein the suction pipe according to any one of claims 1 to 6 is installed on the underwater sediment, and a water flow is generated in the pipe of the suction pipe by the water flow generating means. Then, the water pipe sucks the underwater deposit together with water from the side suction hole and the bottom suction hole by making the inside of the suction pipe negative pressure by the water flow, and the tip of the suction pipe is submerged in the negative pressure by the negative pressure. The underwater sediment is dredged while forming a mortar-shaped depression in the underwater sediment centering on the tip, so that it can be realized with a simple structure without requiring large facilities and power. Easy, economical, hard to break, and weather The left and right are stably and efficiently mass-water sediments without can be Nagareoku (transport or disposal).

  An embodiment of the present invention will be described with reference to the drawings.

(Underwater sediment flow device)
First, an embodiment of an underwater sediment inflow device according to the present invention will be described with reference to FIGS. 1 to 3 are explanatory diagrams showing a schematic configuration of a feeding device which is an embodiment of the feeding device for underwater sediments according to the present invention and a progress state of the dredging work in a vertical section. 2 shows the state before the start of suction, FIG. 2 shows the state during the suction operation, FIG. 3 shows the end of the suction, (A) in each figure shows a vertical sectional view, and (B) shows a plan view. .

  Reference symbol A in the figure is a dam reservoir as an example of a closed water area, reference symbol D indicates the dam, reference symbol S indicates an underwater sediment, reference symbol 1 indicates an underwater sediment according to the present invention. It is a flow apparatus illustrated as one embodiment of a flow apparatus. The inflow apparatus 1 includes an inflow pipe 2 which is a transfer path of the deposit S for sucking the deposit S from the dam reservoir A together with water and discharging (discharging) it to the downstream area B, and the inflow pipe 2. Mainly from water flow generating means 3 for generating a water flow inside the pipe 2 and flow rate control means 4 for controlling the flow rate of water discharged from the flow pipe 2 (meaning a mixture of water and sediment; the same applies hereinafter). This is an apparatus having a function of sucking and sucking the underwater sediment S deposited on the bottom of the dam reservoir A together with water and discharging it to the downstream area B.

The end of the dam reservoir A side is the intake port 2a and the end of the downstream region B side is the discharge port 2b. The flow pipe 2 penetrates the dam D from the dam reservoir A to the downstream region B. The dam D penetrating portion is the highest, and the tip of the intake port 2a (suction side) (the end of the dam reservoir A side in the figure) is connected to a suction pipe 5 to be described later according to the present invention. It has become. As the pipe material of the flow pipe 2, resin pipes such as high density polyethylene pipes and vinyl chloride pipes, and metal pipes such as steel pipes, cast iron pipes and stainless steel pipes can be used. Any pipe material having water tightness, air tightness, and pressure resistance that can maintain the negative pressure due to the generated water flow may be used.
The flow pipe 2 does not necessarily pass through the dam D, and may be piped so as to bypass the upper end of the dam D. However, when the siphon phenomenon is used, the water intake port 2a is used. It is necessary to make a detour upward by the amount that allows a predetermined water head pressure to be obtained, and to be piped to the downstream region B side.

  The water flow generating means 3 is provided with a general fluid pump 30 in the middle of the flow pipe 2, and generates an initial water flow that attracts water and sediment S from the dam reservoir A and induces a siphon phenomenon. Once the water flow has started, the fluid pump 30 is stopped, and water is sucked from the dam reservoir A by the head pressure at which the water flow over the top of the flow pipe 2 falls, so that the water flow is maintained. . Of course, instead of using the siphon phenomenon, the water flow may be generated only by the power of the fluid pump 30. Also, the fluid pump 30 is not provided, and the intake port 2a of the flow pipe 2 is higher than the discharge port 2b. In addition, the flow pipe 2 may be provided in a straight line, and a water flow may be generated by utilizing a water level difference (level difference) between the water intake port 2a and the discharge port 2b. In other words, the water flow generation means 3 may be configured to generate a water flow in the pipe of the flow pipe 2. However, power (such as a motor using electric power or light oil) is necessary to operate the fluid pump 30, and the running cost increases. Therefore, it is desirable to use the siphon phenomenon as in the present embodiment. . Moreover, when utilizing a water level difference, the case where it is difficult to attach the height difference of the water intake port 2a and the discharge port 2b only to the extent that a predetermined suction force can be obtained is assumed.

The flow rate control means 4 has a discharge gate 40 in the vicinity of the discharge port 2b, and is configured to be able to adjust the effective opening area in the pipe of the flow pipe 2 by opening and closing the discharge gate 40. By controlling the opening and closing, the suction amount of the deposit S from the suction pipe 5 can also be adjusted, and the suction of the deposit S from the suction pipe 5 can also be stopped by completely closing the discharge gate 40. it can. Further, since the discharge gate 40 is installed in the vicinity of the discharge port 2b (that is, below a sufficient distance from the top), the discharge gate 40 is discharged from the top of the flow pipe 2 only by reopening the discharge gate 40. The water accumulated up to the gate 40 falls, and the sediment S from the suction pipe 5 can be re-sucked by the water head pressure. That is, once the discharge gate 40 is closed and water can be accumulated from the discharge gate 40 to the top of the flow pipe 2, the suction from the suction pipe 5 can be resumed at any time without operating the fluid pump 30. Can do.
The discharge gate 40 may of course be an adjustment valve such as a valve, and may be any mechanism that can adjust the effective opening area in the pipe of the flow pipe 2.

(Suction pipe)
Next, an embodiment of a suction pipe according to the present invention will be described with reference to FIGS.
4 is a plan view of the suction pipe according to the embodiment, FIG. 5 is a side view of the suction pipe of FIG. 4, FIG. 6 is an enlarged plan view mainly showing a folded portion of the suction pipe of FIG. FIG. 8 is a bottom view of the folded portion of FIG. 6, FIG. 8 is an end view taken along line XX of the folded portion of FIG. 4, and FIG. 9 is a side view of the tip portion of the folded portion of FIG.

The suction pipe 5 shown in the figure is mainly composed of a pipe main body 50 whose main material is a flexible pipe material having both ends opened. One open end is at the water intake port 2a and the other open end is a water flow. It is a connection end 51 following the means 3 and the discharge port 2b. Further, a folded portion 52 is formed at the intermediate portion located substantially at the center between the water intake port 2a and the connection end 51, and the folded portion 52 is formed by folding and fixing the tube material of the tube main body 50 in a U shape or a horseshoe shape in plan view. A sheet member 53 is bonded along the bottom surface of the portion 52.
In addition, the folding of the pipe material of the folding part 52 may be oval or circular in a plan view, and the pipe material communicating with the water intake port 2a may be folded and fixed.

  In the present embodiment, the pipe body 50 is composed of a bellows-like flexible pipe made of a hard high-density polyethylene helical wire and a soft high-density polyethylene film that connects the wires. The watertightness, airtightness, and pressure resistance that can maintain the negative pressure due to the water flow generated by the means 3, and the depth and surface shape of the “mortar-shaped” depression of the underwater sediment S that changes as the dredging operation progresses What is necessary is just to be comprised from the pipe material which has the flexibility which can follow the change (refer FIGS. 1-3). In addition, although the pipe diameter d of the pipe main body 50 which concerns on this Embodiment assumes the thing of about 500 mm-1000 mm, the scale of the dam reservoir A (closed water area) which installs the feeding apparatus 1, Needless to say, it can be selected as appropriate in consideration of the period of dredging work.

  As shown in FIGS. 5 and 8, the folded portion 52 is cut out at the lower portion of the tube body 50, the sheet member 53 is bonded thereto, and the bottom surface portion of the tube body 50 becomes a suction surface 52 a formed flat. As shown in FIG. 7, a plurality of bottom surface suction holes 54 for sucking the underwater deposit S are formed in the suction surface 52 a so as to communicate with the inside of the pipe body 50. Further, as shown in FIG. 9, a side suction hole 55 for sucking the underwater deposit S is formed at the tip 52 b of the folded portion 52 so as to communicate with the inside of the pipe body 50 above the sheet member 53. . In the present embodiment, as shown in FIGS. 7 and 8, five bottom suction holes 54 having a size of 1 / 2d (1/2 times the tube diameter d of the tube body 50) are provided. As shown in FIG. 9, one suction hole 55 having a size of 1 / 3d is provided. In the present embodiment, the suction surface 52a is formed from the sheet member 53. However, the suction surface 52a has predetermined strength and rigidity such as the same material as the tube main body 50 according to the tube diameter d of the tube main body 50. A bottom plate made of a material may be provided for reinforcement, and the sheet member may be bonded from the outside of the bottom plate. Further, the bonding between the sheet member 53 and the tube main body 50 may be another fixing method such as heat welding or ultrasonic welding.

The sheet member 53 is made of a resin sheet such as a vinyl sheet having a predetermined flexibility and water impermeability, and has a total length L1 of 10d (10 times the tube diameter d of the tube body 50) as shown in FIGS. ), The overhang length L2 from the tip 52b of the folded portion 52 is 1 / 3d, and the overhang length L3 from the side surface portion of the folded portion 52 is set to a size of about 2d as shown in FIGS. ing. Here, the predetermined flexibility is only required to be able to follow the surface shape (see FIGS. 1 to 3) of the mortar-shaped depression of the underwater sediment S that changes as the dredging operation proceeds. Further, the size of the sheet member 53 is set by trial and error so that the suction amount of the deposit S with respect to the pipe diameter d is maximized from a model experiment or the like. The suction force can be maintained following the change in the surface shape, and the suction pipe 5 has an optimum size that does not prevent the suction pipe 5 from submerging (submitting) in the deposit S.
Then, by setting the overhanging length L2 from the leading end 52b of the folded portion 52 to 1 / 3d or less, the overhanging portion from the leading end portion 52b of the folded portion 52 of the sheet member 53 is rolled by the suction force of the side suction hole 55. There is no possibility that the side suction hole 55 will be closed.

The outer edge portion of the sheet member 53 has a resin sheet folded back and fixed along the edge in a bag shape, and a weight 56 made of a chain material is included in the bag-like portion 53a. For this reason, the sheet member 53 is not swollen or wrinkled due to the water flow flowing in the dam reservoir A (closed water area) or the water flow generated around the suction pipe 5 at the time of suction. Further, since the sheet member 53 has flexibility that can follow the change in the surface shape of the underwater deposit S, a space is formed between the sheet member 53 and the deposit S, which becomes a water channel. This reduces the possibility that the suction force will decrease. Moreover, the deployment of the sheet member 53 in water can also be naturally deployed without any effort due to the gravity of the weight 56.
Of course, the weight 56 is not limited to the chain material, and may be, for example, a weight of a kite that is attached around the edge of the sheet member 53 with a small predetermined interval. Any weight may be used as long as it is flexible enough to follow the change and can seal the suction force of the bottom suction hole 54 by pressing the edge of the sheet member 53.

  4 and 5, a bent elbow pipe 57 is connected to the tip of the water intake port 2a, a pedestal (not shown) is attached, and the open end 2a 'of the elbow pipe 57 faces upward. It is preferable that the opening end is set as a water inlet 2a ′, and by doing so, the water inlet 2a is buried in the accumulation part S, and high-concentration earth and sand are sucked at a time, and the suction pipe 5 There is less risk that the pipe will be clogged and the water flow will stop.

  Furthermore, as shown in FIG. 4, the distance D1 between the water intake 2a (2a ′) and the side suction hole 55 (that is, the tip 52b of the suction pipe 5) is 40d (pipe of the pipe body 50). 40 times the diameter d) or more. By setting in such a manner, the intake port 2a (2a ') of the suction pipe 5 is always installed outside the mortar-shaped depression where there is a risk of collapse of earth and sand (sediment). This is because the possibility that the water flow in the pipe of the suction pipe 5 stops due to clogging or the like is further reduced. The set value of the interval D1 is set according to the following procedure. First, the thickness T1 of the underwater sediment S is grasped in advance by some method, for example, by directly measuring the thickness T1 with a radar or by predicting it based on the annual average thickness of sediment deposition. The underwater angle of repose θ of the deposit S can be predicted to some extent from the composition of the deposit S and the like, as shown in FIG. 3, the deposit S at the end of suction from the thickness T1 and the underwater angle of repose θ. Determine the maximum shape of the mortar-shaped depression formed in the. Next, the slope length D2 of the maximum shape of the mortar-shaped depression is calculated. The distance D1 between the water intake 2a (2a ') and the side suction hole 55 is set to be longer than the slope length D2.

(Operation of underwater sediment feeding device and underwater sediment feeding method)
Next, the operation of the flow feeding device 1 and the method of feeding the underwater sediment will be described with reference to FIGS. As shown in FIG. 1, first, the suction pipe 5, which is the tip portion of the flow pipe 2, is installed on the underwater sediment S collected at the bottom of the dam reservoir A. Then, a water flow is generated in the pipe of the suction pipe 5 (flow pipe 2) by the water flow generating means 3. When a water flow occurs, the suction pipe 5 (flow pipe 2) has a negative pressure in the pipe compared to the surroundings, so that the suction surface 52a of the folded portion 52 in which the bottom suction hole 54 is formed is sucked into the deposit S. The bottom suction hole 54 is attached to the deposit S and suction of the deposit S is started. At this time, fresh water (water of the dam reservoir A not including the deposit S) is taken from the intake port 2a, and a mixture of the deposit S and water is discharged from the discharge port 2b. Discharged to downstream area B.

  Next, when the soot of the deposit S progresses to some extent, as shown in FIG. 2, the tip 52 b of the suction pipe 5 goes under the deposit S, and the suction of the deposit S also starts from the side suction holes 55. Then, on the surface of the deposit S, a recess Sa that is a residue of the deposit S is formed around the tip 52b of the suction pipe 5, and collapse of earth and sand from the upper surface of the slope, Suction of earth and sand from the suction holes 54 and the side suction holes 55 is repeated, and the depression Sa gradually grows in a mortar shape.

  Finally, as shown in FIG. 3, the tip 52 b of the suction pipe 5 reaches the bottom of the dam reservoir A, the suction of the deposit S from the bottom suction hole 54 is stopped, and finally it is buried in the deposit S. The submerged side suction hole 55 appears from the deposit S, and the suction of the deposit S is completely completed. As described above, the flow feeding device 1 can not only stop the suction of the deposit S at any time but can restart it at any time only by opening and closing the discharge gate 40 of the flow rate control means 4. . For this reason, there is no need to leave a trolley or the like, and the sediment S can be moved to the downstream area safely and extremely easily without being affected by the weather of the dam reservoir A (closed water area) or weather conditions such as waves. B can be transferred.

  As described above, according to the flow feeding device 1 according to the present embodiment, a mortar-shaped depression is formed in the underwater deposit S as the underwater deposit S is sucked, and the deposit S is formed from the slope of the depression. Even if the high-concentration sediment S is sucked and clogged at a time from the side suction hole 55 located at the tip 52b of the suction pipe 5, the fresh water always flows from the water intake 2a (2a '). Since the water of the dam reservoir A that does not include the deposit S can be taken, the water flow in the pipe of the suction pipe does not stop. For this reason, the dredging operation of the deposit S can be continued without requiring a large facility or power, and as a result, a large amount can be transferred stably and efficiently. Moreover, since it is realized by a simple structure, it is economical and difficult to break. Moreover, since the suction pipe 5 is transported and installed on the deposit S, it can be installed very easily. For this reason, work is possible regardless of the weather, and it is safe.

  Although the embodiment of the present invention has been described by taking a dam reservoir as an example of a closed water area, the scope of the present invention is not limited to a dam reservoir, but a dam, a reservoir, a sewage treatment plant, It can be applied to water storage facilities and closed waters that require dredging work such as natural rivers, lakes, ponds, or canals. Moreover, although the case where the sediment was transported / released to the downstream area was described, the transport includes not only the transfer to other areas (other water areas and other places) but also the case of disposal. . The configuration of the flow pipe (portion other than the suction pipe), the water flow generation means, the flow rate control means, etc. used to describe the embodiments are merely preferred examples, and other known techniques. Can be substituted. Even in such a case, it is clear that the above-described effect is achieved. Of course, the shapes, dimensions, and the like of the respective components shown in the drawings show a preferable example, and it is needless to say that design changes and modifications can be arbitrarily made within the scope described in the claims. Absent.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which represents the schematic structure of the submerged sediment inflow apparatus which concerns on embodiment of this invention, and the condition before the work start of a submerged sediment and the inflow apparatus with a vertical cross section. It is explanatory drawing showing the condition in work same as the above. It is explanatory drawing showing the condition at the time of completion | finish of work same as the above. It is a top view of the suction pipe concerning an embodiment. It is a side view of a suction pipe same as the above. It is an enlarged plan view which mainly shows the folding | turning part of the suction pipe of FIG. It is a bottom view of the folding | turning part same as the above. X-X-ray cut vertical end view of the folded portion of FIG. It is a side view of the front-end | tip part of a folding | turning part same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow feeder 2 Flow pipe 2a, 2a 'Water intake port 2b Discharge port 3 Water flow generation means 30 Fluid pump 4 Flow rate control means 40 Discharge gate 5 Suction pipe 50 Pipe body 51 Connection end 52 Folding part 52a Bottom)
53 Sheet member 54 Bottom suction hole 55 Side suction hole 56 Weight 57 Elbow pipe S Underwater sediment D Dam A Dam reservoir (closed water area)
B Downstream area (other areas)

Claims (8)

A suction pipe for transporting an underwater sediment stream for sucking together with water the underwater sediment deposited on the bottom of a closed body of water and flowing it to another area,
Formed from a flexible tube with both ends open, one end is a water intake that is a water intake, and the other is a connection end on the discharge port side,
At the middle part of both ends, a folded part is formed by folding and fixing the pipe material, and the lower part of the pipe material with the folded part is cut out, and this cut out part has a surface shape of the underwater sediment. A sheet member having flexibility capable of following the change is bonded, and a plurality of bottom surface suction holes for sucking the underwater deposits are formed in the sheet member so as to communicate with the inside of the pipe member,
An underwater deposition characterized in that a side suction hole for sucking underwater deposits is formed in a side surface portion of the pipe material, which is above the sheet member and corresponds to a tip portion of the folded portion, in communication with the inside of the pipe material. Suction pipe for logistics.   2. The underwater deposition according to claim 1, wherein a flexible weight capable of following a change in a surface shape of the underwater deposit is disposed along an edge of the outer edge portion of the sheet member. Suction pipe for logistics.   The overhanging length of the sheet member from the distal end portion of the folded portion is 1/3 or less of the tube diameter of the pipe material. Suction pipe.   The overhang length of the sheet member from the side surface portion of the folded portion is about twice the diameter of the tube material, and the length of the sheet member in the direction along the tube material is about 10 times the diameter of the tube material. The suction pipe for transporting an underwater sedimentary stream according to any one of claims 1 to 3, wherein the suction pipe is set to be.   The distance between the intake port and the side suction hole is obtained by grasping the thickness of the underwater deposit in advance, and from the thickness and the angle of repose of the underwater deposit, a mortar-like shape formed in the underwater deposit at the end of the suction. 5. The underwater sediment distribution transport according to claim 1, wherein the maximum shape of the depression is determined, the slope length thereof is calculated, and the interval is set to be longer than the slope length. Suction pipe.   A bent elbow pipe is connected to the intake port, and an open end of the elbow pipe is installed upward. Suction pipe. An underwater sediment feeding device that sucks the underwater sediment deposited on the bottom of a closed body of water together with water and sends it to other areas,
An underwater sediment flow comprising: the suction pipe according to any one of claims 1 to 6; and water flow generating means for generating a water flow for sucking the underwater sediment into a pipe of the suction pipe. Feeding device. A method for feeding underwater sediments, wherein the underwater sediment logistics apparatus according to claim 7 is used to suck the underwater sediments deposited on the bottom of a closed water area together with water and feed them to other areas. And
The suction pipe according to any one of claims 1 to 6 is installed on an underwater deposit, a water flow is generated in the pipe of the suction pipe by the water flow generation means, and the negative pressure is generated in the pipe of the suction pipe by the water flow. The underwater deposit is sucked together with water from the side suction hole and the bottom suction hole, and the tip of the suction pipe is submerged in the underwater deposit by the negative pressure, and the underwater deposit is centered on the tip. A method for inflowing underwater sediments, wherein the underwater sediments are dredged while forming a mortar-shaped depression.

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