Recovery tank system and method of operation thereof

Abstract

To provide a collection tank system and an operation method for the same which can efficiently collect mud, and can absorb a large volumes of mud while avoiding cost increase.SOLUTION: A collection tank system 12a, which absorbs and discharges mud water including soil accumulated at a bottom of water, comprises a plurality of collection tanks T1 and T2 connected to each other in parallel and a controller that controls operation of the collection tanks. The plurality of collection tanks T1 and T2 respectively are constituted of a first tank chamber BL11 that absorbs mud water by setting pressure in the inside thereof to negative pressure and a second tank chamber BL21 having a second opening / closing valve SV21, connected through a first opening / closing valve SV11 to a bottom part of the first tank chamber, which discharges mud water to the bottom part. The controller controls opening and closing of the first and the second opening / closing valves by changing air pressure in the first tank chambers and in the second tank chamber of the collection tanks, so that absorbing / discharging steps of the plurality of collection tanks are continuously executed while delaying timings of the absorbing / discharging steps of the collection tanks by a predetermined time.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an underwater sediment recovery system, and more particularly to a recovery tank system and a method for operating the same. [Background technology]

[0002] Various technologies have been proposed for recovering sediment from underwater. In the sand pumping and transporting device disclosed in Patent Document 1, a vacuum generator is used to suck up the sediment, and compressed air is also used to transport the water and sediment continuously to a sediment recovery section (solid-liquid separation device), where the water and sediment are separated, allowing for the recovery of a high concentration of sediment.

[0003] In addition, the sediment removal equipment disclosed in Patent Document 2 is provided with a pair of recovery tanks for solid-liquid separation, and by alternately switching between suction and discharge, continuous operation of the discharge system is possible. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2018-158277 [Patent Document 2] Patent Publication No. 2011-125865 Summary of the Invention [Problem to be solved by the invention]

[0005] In the discharge system disclosed in Patent Document 2, when the water level in the first collection tank reaches its upper limit, the system switches to the second collection tank. During this time, the wastewater containing sediment stored in the first collection tank is discharged. When the second collection tank reaches its upper limit, the system switches back to the first collection tank. This alternating operation is used. For this reason, if there is a difference between the water absorption process time required for the collection tank to reach its upper limit and the water discharge process time required for the collection tank to reach its lower limit, efficient discharge processing cannot be performed. For example, if the water discharge process time is significantly shorter than the water absorption process time, once one collection tank has completed draining, the system will remain idle until the next water absorption begins.

[0006] If multiple collection tanks are to be operated simultaneously, a vacuum suction device with sufficiently high performance is required, but if a large volume of suction is performed, the collection tank is likely to exceed its upper limit and burst, hindering continuous construction. In addition, the increased frequency of the drainage process causes wear on parts, and the high costs of part replacement are unavoidable.

[0007] The present invention was devised in consideration of the above circumstances, and an object of the present invention is to provide a recovery tank system and an operating method thereof that can improve the efficiency of mud recovery and accommodate large-volume suction while avoiding high costs. [Means for solving the problem]

[0008] In order to achieve the above object, according to one embodiment of the present invention, there is provided a recovery tank system for sucking in and discharging muddy water containing sedimentary soil from the bottom of a body of water, comprising a plurality of recovery tanks connected in parallel and a controller for controlling the operation of each recovery tank, wherein each of the plurality of recovery tanks comprises a first tank chamber that sucks in the muddy water by creating a negative pressure inside it, and a second tank chamber that is connected to the bottom of the first tank chamber via a first open / close valve and has a second open / close valve for discharging the muddy water to the bottom, and the controller controls the opening and closing of the first and second open / close valves by changing the air pressure in the first tank chamber and the second tank chamber of each recovery tank, and sequentially performs the suction / discharge processes of the plurality of recovery tanks in parallel while delaying the timing of the absorption / discharge processes of each recovery tank by a predetermined time.The discharge processes of the plurality of collection tanks are set to different timings, and the predetermined delay time is set to be longer than the discharge process time of each of the plurality of collection tanks. , characterized in that 。 In a recovery tank system according to one embodiment of the present invention, each of the plurality of recovery tanks further has a first control valve for connecting or separating the first tank chamber and the second tank chamber, and a second control valve for connecting or separating the second tank chamber and the outside, and the controller can change the air pressure in the first tank chamber and the second tank chamber by controlling the opening and closing of the first and second control valves, respectively. In a recovery tank system according to one embodiment of the present invention, the controller can perform continuous operation of the multiple recovery tanks by a) opening the first opening / closing valve to cause the muddy water sucked into and stored in the first tank chamber to fall into the second tank chamber and be stored in the second tank chamber, b) closing the first opening / closing valve to store the muddy water sucked into the first tank chamber, c) opening the second opening / closing valve to discharge the muddy water stored in the second tank chamber, and d) closing the second opening / closing valve, and repeating a)-d). To achieve the above object, according to one embodiment of the present invention, there is provided a method for operating a recovery tank system that includes a plurality of recovery tanks connected in parallel and a controller for controlling the operation of each recovery tank, and that sucks in and discharges muddy water containing sediment from the bottom of a body of water, wherein each of the plurality of recovery tanks comprises a first tank chamber that sucks in the muddy water by creating a negative pressure inside the first tank chamber, and a second tank chamber that is connected to the bottom of the first tank chamber via a first open / close valve and has a second open / close valve for discharging the muddy water to the bottom, and the controller controls the opening and closing of the first and second open / close valves by changing the air pressure in the first tank chamber and the second tank chamber of each recovery tank, and sequentially performs the suction / discharge processes of the plurality of recovery tanks in parallel while delaying the timing of the absorption / discharge processes of the plurality of recovery tanks by a predetermined time. The discharge processes of the plurality of collection tanks are set to different timings, and the predetermined delay time is set to be longer than the discharge process time of each of the plurality of collection tanks. Characterized by 。 In a method for operating a recovery tank system according to one embodiment of the present invention, each of the plurality of recovery tanks further has a first control valve for connecting or separating the first tank chamber and the second tank chamber, and a second control valve for connecting or separating the second tank chamber and the outside, and the controller can change the air pressure in the first tank chamber and the second tank chamber by controlling the opening and closing of the first and second control valves, respectively. In one embodiment of the present invention, in a method for operating a recovery tank system, the controller a) opens the first opening / closing valve to cause the muddy water sucked into and stored in the first tank chamber to fall into the second tank chamber and be stored in the second tank chamber, b) closes the first opening / closing valve to store the muddy water sucked into the first tank chamber, c) opens the second opening / closing valve to discharge the muddy water stored in the second tank chamber, and d) closes the second opening / closing valve, and can perform continuous operation of the multiple recovery tanks by repeating a)-d). [Effects of the Invention]

[0009] According to one embodiment of the present invention, by delaying the absorption / discharge timing of each of multiple recovery tanks connected in parallel by a predetermined time, the suction / discharge processes of multiple recovery tanks can be carried out continuously in parallel, thereby making the recovery of sediment more efficient. According to one embodiment of the present invention, by setting the discharge processes of the plurality of collection tanks at different times, the suction / discharge processes can be performed continuously in parallel without overlapping the discharge processes of the plurality of collection tanks in time. This reduces the capacity of the high-concentration conveying pump that discharges muddy water, making it possible to efficiently collect mud and accommodate large-volume suction while avoiding high costs. According to one embodiment of the present invention, the air pressures in the first tank chamber and the second tank chamber are changed by controlling the opening and closing of a first control valve for connecting or separating the first tank chamber and the second tank chamber, and a second control valve for connecting or separating the second tank chamber and the outside. This makes it possible to automatically control the opening and closing of the first and second opening and closing valves of each collection tank without providing a drive mechanism for opening and closing them, thereby simplifying the configuration for opening and closing control. According to one embodiment of the present invention, the recovery tank, which is composed of a first tank chamber and a second tank chamber, is operated continuously by repeating the above-mentioned operations a) to d) to perform continuous operation of multiple recovery tanks. This improves the efficiency of mud recovery and enables large-volume suction while avoiding high costs. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic configuration diagram of a barge-based sediment recovery facility equipped with a recovery tank system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram of one mud recovery tank in the recovery tank system according to the present embodiment. [Figure 3] 3 is a flowchart showing an example of operation control of the mud recovery tank shown in FIG. 2. [Figure 4] FIG. 3 is a schematic diagram showing an example of operation control of the mud recovery tank shown in FIG. 2. [Figure 5] 3 is a time chart showing the mud absorption / discharge cycle of the mud recovery tank shown in FIG. 2. [Figure 6] 1 is a block diagram of a recovery tank system according to a first embodiment of the present invention. [Figure 7] 7 is a time chart showing the operation control of the recovery tank system shown in FIG. 6. [Figure 8] FIG. 10 is a block diagram of a recovery tank system according to a second embodiment of the present invention. [Figure 9] 9 is a time chart showing the operation control of the recovery tank system shown in FIG. 8. [Figure 10] FIG. 10 is a block diagram of a recovery tank system according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] 1. First embodiment As illustrated in Figure 1, the sediment recovery equipment mounted on a barge 10 is equipment that sucks up sediment 20 that has accumulated at the bottom of water in rivers, canals, lakes, dam reservoirs, pump sedimentation basins, etc., and recovers the sediment on the barge 10, and the recovered sediment is transported to a sedimentation basin on land.

[0013] Mounted on barge 10 are portal equipment 11, recovery tank system 12, filter 13, vacuum suction device 14, and high-concentration transport pump 15. Portal equipment 11 suspends mixing high-concentration pump 20 by wire rope 16 so that it can be raised and lowered, and auger-equipped suction machine 21 attached to the bottom of mixing high-concentration pump 20 can be lowered to sediment 22 at the bottom of the water at an arbitrary head h. Sediment 22 sucked up by auger-equipped suction machine 21 is agitated by mixing high-concentration pump 20 and transported to recovery tank system 12 through vacuum suction pipe 23, and the absorbed water is transported to recovery tank system 12 through pumping transport pipe 24.

[0014] The recovery tank system 12 comprises multiple recovery tanks, a system for controlling the operation of each tank, and a water tank W for storing discharged muddy water; in this embodiment, multiple (n) mud recovery tanks T1 to Tn are installed. Each mud recovery tank sucks up muddy water, a mixture of sediment and water, through a vacuum suction pipe 23 in a cycle described below, and discharges it into the water tank W. The muddy water stored in the water tank W is transported to a settling basin by a high-concentration transport pump 15. The suction and discharge of sediment 22 is performed by a vacuum suction device 14 creating a negative pressure inside the recovery tank through a filter 13, as described below, and by the control unit controlling the valves of the mud recovery tank.

[0015] The barge 10 is provided with a control room (not shown), where workers can visually or monitor the continuous operation control of the recovery tank system 12 (described later) and the operation control of the vacuum suction device 14 and high-concentration transport pump 15. Next, the configuration and operation control of the mud recovery tank in the recovery tank system 12 will be described in detail.

[0016] 1.1) Mud collection tank 2, each of the mud recovery tanks T1 to Tn (hereinafter referred to as mud recovery tank T) has a two-tiered structure consisting of an upper tank chamber BL1 and a lower tank chamber BL2. An inlet I and an outlet E are provided on the top surface of the upper tank chamber BL1, and a vacuum suction pipe 23 is connected to the inlet I, and a vacuum suction device 14 is connected to the outlet E.

[0017] The bottom surface of the upper tank chamber BL1 slopes toward the center, and an on-off valve SV1 that opens only downward is provided at the center lower end. The upper tank chamber BL1 can be connected downward to the lower tank chamber BL2 through the on-off valve SV1. In this embodiment, the on-off valve SV1 functions similarly to a check valve and, as described below, opens and closes naturally in response to the air pressure difference between the upper tank chamber BL1 and the lower tank chamber BL2, allowing the muddy water stored in the upper tank chamber BL1 to fall into the lower tank chamber BL2. That is, if the air pressure in the upper tank chamber BL1 is lower than that in the lower tank chamber BL2, the on-off valve SV1 closes to store the muddy water, and if the air pressures in the upper tank chamber BL1 and the lower tank chamber BL2 are equal, the on-off valve SV1 opens to allow the stored muddy water to fall into the lower tank chamber BL2.

[0018] The bottom surface of the lower tank chamber BL2 is slanted toward the center, and an on-off valve SV2 that opens only downward is provided at the bottom center of the bottom surface. In this embodiment, the on-off valve SV2 functions similarly to a check valve, and as described below, it opens and closes naturally in response to the pressure difference between the lower tank chamber BL2 and the atmospheric pressure, similar to the on-off valve SV1 described above, allowing the muddy water stored in the lower tank chamber BL2 to be discharged into the water tank W.

[0019] The mud recovery tank T according to this embodiment can perform continuous mud suction and discharge by controlling the opening and closing of the on-off valves SV1 and SV2, but the opening and closing control of the on-off valves SV1 and SV2 can be achieved in various ways. In this embodiment, as will be described below, the opening and closing control of the on-off valves SV1 and SV2 is performed by utilizing the air pressure difference between the upper tank chamber BL1 and the lower tank chamber BL2, and the air pressure difference between the lower tank chamber BL2 and the outside. In other words, the on-off valves SV1 and SV2 can be configured as passive valves that can open downward, and no special actuators are required for opening and closing.

[0020] Communication ports C1 and C2 on the side of each of the upper and lower tank chambers BL1 and BL2 are connected to a control valve VL1 that can be electromagnetically controlled to open and close, and the upper and lower tank chambers BL1 and BL2 communicate with each other when control valve VL1 is open and are isolated from each other when control valve VL1 is closed.Furthermore, communication port C3 on the side of the lower tank chamber BL2 is connected to a control valve VL2 that can be electromagnetically controlled to open and close, and the lower tank chamber BL2 communicates with the outside when control valve VL2 is open and is isolated from the outside when control valve VL2 is closed.

[0021] Furthermore, the upper tank chamber BL1 and the lower tank chamber BL2 are provided with level sensors S1 and S2, respectively, to detect the muddy water level inside. As will be described later, the valve controller (control unit) 100 opens and closes the control valves VL1 and VL2 while monitoring the water level detected by the level sensors S1 and S2 and / or a timer, thereby controlling the suction / discharge of the mud recovery tank. The suction / discharge control of the mud recovery tank will be described below.

[0022] 1.2) Suction / discharge control The suction / discharge control of the valve controller 100 according to this embodiment will be described in detail with reference to Figures 3 and 4. The functions of the valve controller 100 can be realized by executing a program stored in a memory (not shown) on a computer processor.

[0023] 3, when the vacuum suction device 14 is activated (operation 201), the valve controller 100 opens the control valve VL1 to connect the upper tank chamber BL1 and the lower tank chamber BL2, and closes the control valve VL2 to isolate the lower tank chamber BL2 from the outside (operation 202). As a result, both the upper tank chamber BL1 and the lower tank chamber BL2 become negative pressure, the opening / closing valve SV2 closes naturally, and the opening / closing valve SV1 opens naturally, causing the muddy water to fall into the lower tank chamber BL2 and accumulate there (FIG. 4(A)).

[0024] Next, the valve controller 100 closes the control valves VL1 and VL2 (operation 203). This creates a negative pressure in the upper tank chamber BL1, causing the on-off valve SV1 to close naturally, and the muddy water is sucked into the upper tank chamber BL1 and stored there (FIG. 4(B)).

[0025] The valve controller 100 detects whether the water level in the upper tank chamber BL1 detected by the level sensor S1 exceeds a predetermined threshold value L H It is monitored whether the predetermined threshold L H As another monitoring method, the valve controller 100 measures the elapsed time from when the control valves VL1 and VL2 are closed using a timer, and determines whether the timer reaches a predetermined elapsed time Tsuc and whether the water level in the upper tank chamber BL1 reaches a predetermined threshold L H The elapsed time Tsuc can be calculated by averaging the actual measured time from when the water level in the tank chamber BL1 reaches a predetermined threshold value L (for example, 80% of the tank chamber capacity). H If either the water level in the upper tank chamber BL1 reaches a predetermined threshold value L or the timer reaches a predetermined elapsed time Tsuc, H It can be judged that this has been achieved.

[0026] The water level in the upper tank chamber BL1 reaches the predetermined threshold L HWhen the pressure reaches 0 (NO in operation 204), the valve controller 100 closes the control valve VL1 and opens the control valve VL2 (operation 205). Closing the control valve VL1 separates the lower tank chamber BL2 from the upper tank chamber BL1, and opening the control valve VL2 connects the lower tank chamber BL2 to the outside and increases the pressure to atmospheric pressure. This causes the on-off valve SV2 to open naturally, and the muddy water stored in the lower tank chamber BL2 is discharged into the water tank W (FIG. 4(C)).

[0027] The valve controller 100 monitors whether the water level in the lower tank chamber BL2 detected by the level sensor S2 has reached zero, i.e., whether the discharge has been completed (operation 206). The determination of the completion of the discharge may be made in combination with monitoring the elapsed time using a timer.

[0028] If the draining is complete (YES in operation 206), the valve controller 100 closes the control valves VL1 and VL2 (FIG. 4(D)). If the control is not completed (NO in operation 208), the above-described operations 202 to 208 can be repeated to repeatedly execute the suction / drain cycle shown in FIGS. 4(A) to 4(D).

[0029] As shown in Figure 5, the upper tank chamber BL1 continues the suction operation through Figures 4(A) to 4(D), and the lower tank chamber BL2 stores muddy water in Figures 4(A) to 4(B) and discharges the muddy water in Figures 4(C) to 4(D). Of one cycle from time t1 to t3, the discharge process is from time t2 to t3, and the time required for the discharge process (discharge process time) is shorter than the time required for the suction process (suction process time), for example, the suction process time = 50 seconds and the discharge process time = 5 seconds.

[0030] As described above, the recovery tank system 12 according to this embodiment allows efficient continuous operation as described below by sequentially operating the suction / discharge cycles of the multiple mud recovery tanks T1 to Tn at predetermined timings.

[0031] 2. Working Example 2.1) First Example As illustrated in Figure 6, the recovery tank system 12a according to the first embodiment of the present invention comprises a pair of mud recovery tanks T1 and T2 arranged in parallel, each of which has the structure shown in Figure 2 and operates in the suction / discharge cycle shown in Figures 3 to 5.

[0032] In the following, to avoid duplication of explanation, the following reference symbols are used in Fig. 6. The upper tank chamber BL1, lower tank chamber BL2, on-off valve SV1, on-off valve SV2, control valve VL1 and control valve VL2 of the mud recovery tank T shown in Fig. 2 correspond to the upper tank chamber BL1x, lower tank chamber BL2x, on-off valve SV 1x , Opening and closing valve SV 2x , control valve VL 1x and control valve VL 2x For example, the control valve VL1 of the mud recovery tank T in FIG. 2 corresponds to the control valve VL of the mud recovery tank T1 in FIG. 11 and the control valve VL of the mud recovery tank T2 11 Since the configurations and functions of these corresponding components are basically the same, detailed descriptions of the structures are omitted.

[0033] Although the level sensors S1 and S2 are not shown in Fig. 6, they are provided in the same manner as in Fig. 2. Therefore, the valve controller 100 monitors the water levels in the upper and lower tank chambers of the mud recovery tanks T1 and T2, and controls the control valve VL of the mud recovery tank T1. 11 and VL 21 and the control valve VL of the mud recovery tank T2 12 and VL 22 and performs suction / discharge control of the mud recovery tanks T1 and T2 at the timings described below.

[0034] As shown in Figure 7, the valve controller 100 controls the suction / discharge operations of mud recovery tanks T1 and T2, starting a mud suction / discharge cycle similar to that shown in Figure 5 for mud recovery tank T1 at time t1, and starting a similar mud suction / discharge cycle for mud recovery tank T2 at time t2, a predetermined time td after time t1. This delay time td is set to be longer than the discharge process time (t3 to t4 or t5 to t6) for the mud recovery tanks. In this way, the valve controller 100 can continuously operate mud recovery tanks T1 and T2 so that the discharge process timings are different.

[0035] For example, as shown in FIG. 6, a suction / discharge cycle can be set so that when the mud recovery tank T1 is in the suction state shown in FIG. 4(A), the mud recovery tank T2 is in the discharge process shown in FIG. 4(C).

[0036] As described above, according to the first embodiment of the present invention, when a pair of mud recovery tanks T1 and T2 are operated continuously, the suction / discharge process of one recovery tank can be delayed by a predetermined time compared to the other, so that the suction / discharge processes of the mud recovery tanks T1 and T2 can be carried out continuously in parallel, thereby making the recovery of sediment more efficient.

[0037] 2.2) Second Example The present invention is not limited to the continuous operation of the pair of recovery tanks T1 and T2 described above, but is similarly applicable to continuous operation using multiple (three or more) recovery tanks. Hereinafter, as a second embodiment of the present invention, continuous operation of three recovery tanks T1 to T3 will be described. However, components having the same functions as those in the first embodiment above will be assigned the same reference numerals or symbols, and descriptions thereof will be omitted.

[0038] To avoid repetition of explanation, the following reference numerals are used in Fig. 8. As in Fig. 6, the upper tank chamber BL1, lower tank chamber BL2, on-off valve SV1, on-off valve SV2, control valve VL1 and control valve VL2 of the mud recovery tank T shown in Fig. 2 correspond to the upper tank chamber BL1x, lower tank chamber BL2x, on-off valve SV of the mud recovery tank Tx (x = 1, 2 or 3). 1x , Opening and closing valve SV 2x , control valve VL 1x and control valve VL 2x correspond to the following:

[0039] Similarly, level sensors S1 and S2 are provided in each of the mud recovery tanks T1 to T3. Therefore, the valve controller 100 monitors the water levels in the upper and lower tank chambers of each of the mud recovery tanks T1 to T3, and controls the control valve VL of each mud recovery tank Tx. 1x and VL 2x and performs suction / discharge control of the mud recovery tanks T1 to T3 at the timings described below.

[0040] 9, the valve controller 100 controls the suction / discharge operations of the mud recovery tanks T1 to T3, starting a mud suction / discharge cycle similar to that shown in FIG. 5 for mud recovery tank T1 at time t1, a similar mud suction / discharge cycle for mud recovery tank T2 at time t1+td, a predetermined time td after time t1, and a similar mud suction / discharge cycle for mud recovery tank T3 at time t1+2td, a further predetermined time td later. The valve controller 100 sets this delay time td to be longer than the discharge process time (t3 to t4) of the mud recovery tanks, and controls the discharge process timing of the mud recovery tanks T1 to T3 so that they are time-varying.

[0041] For example, as shown in FIG. 9, the mud recovery tanks T2 and T3 are set to enter the discharging process at different times when the mud recovery tank T1 is in the storing process.

[0042] As described above, according to the second embodiment of the present invention, when three mud recovery tanks T1 to T3 are operated continuously, the suction / discharge processes of the mud recovery tanks T1 to T3 can be carried out continuously in parallel by delaying each other's suction / discharge processes by a predetermined time, thereby making it possible to efficiently recover sediment.

[0043] 2.3) Third Example The third embodiment of the present invention will be described below, which is the continuous operation of two pairs of recovery tanks T1 and T2 and T3 and T4. However, the same reference numerals or symbols are used for members having the same functions as those in the first and second embodiments, and their description will be omitted.

[0044] 10. In order to avoid repetition of explanation, the following reference numerals are used in Fig. 10. As in Fig. 6, the upper tank chamber BL1, lower tank chamber BL2, on-off valve SV1, on-off valve SV2, control valve VL1 and control valve VL2 of the mud recovery tank T shown in Fig. 2 correspond to the upper tank chamber BL1x, lower tank chamber BL2x, on-off valve SV of the mud recovery tank Tx (x = 1, 2, 3 or 4). 1x , Opening and closing valve SV 2x , control valve VL 1x and control valve VL 2x Similarly, level sensors S1 and S2 are provided in each of the mud recovery tanks T1 to T4.

[0045] As shown in FIG. 10, the suction pipe 121 connected to the vacuum suction pipe 23 branches into four branches, and the first branch is connected to the control valve VL 10 The second branch is connected to the suction port I1 of the mud recovery tank T1 via the control valve VL 20 The third branch is connected to the suction port I2 of the mud recovery tank T2 via the control valve VL 30 The fourth branch is connected to the suction port I3 of the mud recovery tank T3 via the control valve VL 40The exhaust port E1 of the mud recovery tank T1 is connected to an exhaust pipe 122 connected to the vacuum suction device 14, and similarly, the exhaust ports E2 to E4 of the mud recovery tanks T2 to T4 are also connected to the exhaust pipe 122.

[0046] Although not shown in FIG. 10, the recovery tank system 12c is provided with a valve controller 100 similar to that shown in FIG. 2, which monitors the water levels in the upper and lower tank chambers of each of the mud recovery tanks T1 to T4 and controls the control valves VL of the mud recovery tanks T1 and T2. 11 , V.L. 21 , V.L. 12 and VL 22 and the control valve VL of the mud recovery tanks T3 and T4. 13 , V.L. 23 , V.L. 14 and VL 24 9. The opening and closing control of the mud recovery tanks T1 to T4 is performed at the same timing as in FIG.

[0047] For example, the valve controller 100 controls the suction / discharge operations of the mud recovery tanks T1-T4, delaying the mud suction / discharge cycle of the mud recovery tanks T1-T4 by a predetermined time td, and continuously operating the mud recovery tanks T1-T4 so that the timing of the discharge process differs over time. Alternatively, as shown in Figure 6, the suction / discharge cycle may be set so that when the mud recovery tanks T1 / T3 are in the suction state shown in Figure 4(A), the mud recovery tanks T2 / T4 are in the discharge process shown in Figure 4(C), and when the mud recovery tanks T1 / T3 are in the suction state shown in Figure 4(A), the suction / discharge cycle may be set so that the mud recovery tanks T2 / T4 are in the discharge process shown in Figure 4(C).

[0048] The valve controller 100 also controls the control valve VL 10 , V.L. 20 , V.L. 30 and VL 40 By independently controlling the opening and closing of each tank, it is possible to determine which combination of mud collection tanks will be operated continuously.

[0049] According to the third embodiment of the present invention, when two pairs of mud recovery tanks T1 and T2, and T3 and T4 are operated continuously, the suction / discharge processes of the mud recovery tanks T1 to T4 can be carried out continuously in parallel by delaying each other's suction / discharge processes by a predetermined time, thereby making it possible to efficiently recover sediment.

[0050] 3.Effects As described above, according to the embodiments and examples of the present invention, by arranging multiple (any number of) recovery tanks configured as shown in Fig. 2 in parallel and delaying the absorption / discharge timing of each recovery tank by a predetermined time td as illustrated in Fig. 7 and Fig. 9, the suction / discharge processes of multiple recovery tanks T1 to Tn can be performed continuously in parallel without overlapping the discharge processes of the multiple recovery tanks, thereby making sediment recovery more efficient. In particular, by setting different timings for the discharge processes of the multiple recovery tanks, the capacity of the high-concentration transfer pump that discharges muddy water can be reduced, making it possible to improve the efficiency of mud recovery and accommodate large-volume suction while avoiding high costs. [Explanation of symbols]

[0051] 10 barges 11 Gate type equipment 12 Recovery Tank System 13 Filters 14 Vacuum suction device 15 High concentration transport pump 16 Wire Rope 20 Sediment soil 21 Mixing high concentration pump 22 Auger-equipped suction machine 23 Vacuum suction tube 24 Pumping and conveying pipe 121 Suction tube 122 Exhaust pipe 100 Valve Controller T1, T2, T3, T4 recovery tanks BL1, BL11-BL14 upper tank room BL2, BL21-BL24 lower tank room S1, S2 level sensors VL1~VL2, VL 11 ~VL 14 , V.L. 21 ~VL 24 Control valve SV1, SV2, SV 11 -SV 14 , S.V. 21 -SV 24 Opening and closing valve

Claims

1. A recovery tank system that sucks up and discharges muddy water containing sediment at the bottom of the water, a plurality of collection tanks connected in parallel; a controller for controlling the operation of each recovery tank; Equipped with Each of the plurality of recovery tanks comprises a first tank chamber that sucks in the muddy water by creating a negative pressure inside, and a second tank chamber that is connected to the bottom of the first tank chamber through a first opening / closing valve and has a second opening / closing valve at the bottom for discharging the muddy water, the controller controls the opening and closing of the first and second opening / closing valves by changing the air pressure in the first tank chamber and the second tank chamber of each recovery tank, and sequentially executes the suction / discharge processes of the plurality of recovery tanks in parallel while delaying the timing of the absorption / discharge processes of each recovery tank by a predetermined time; The discharge processes of the plurality of collection tanks are set at different times, and the predetermined delay time is set longer than the discharge process time of each of the plurality of collection tanks. A recovery tank system.

2. Each of the plurality of recovery tanks a first control valve for connecting or separating the first tank chamber and the second tank chamber; a second control valve for connecting or isolating the second tank chamber from the outside; and 2. The recovery tank system according to claim 1, wherein the controller controls the opening and closing of the first and second control valves to change the air pressure in the first tank chamber and the second tank chamber.

3. The controller: a) opening the first opening / closing valve to allow the muddy water sucked into and stored in the first tank chamber to fall into the second tank chamber and be stored in the second tank chamber; b) closing the first opening / closing valve to store the sucked muddy water in the first tank chamber; c) opening the second opening / closing valve to discharge the muddy water stored in the second tank chamber; d) closing the second on-off valve; 3. The recovery tank system according to claim 1, wherein the plurality of recovery tanks are continuously operated by repeating steps a) to d).

4. A method for operating a recovery tank system that includes a plurality of recovery tanks connected in parallel and a controller that controls the operation of each recovery tank, and that sucks and discharges muddy water containing sediment from the bottom of the water, comprising: Each of the plurality of recovery tanks comprises a first tank chamber that sucks in the muddy water by creating a negative pressure inside, and a second tank chamber that is connected to the bottom of the first tank chamber through a first opening / closing valve and has a second opening / closing valve at the bottom for discharging the muddy water, The controller: controlling the opening and closing of the first and second opening and closing valves by changing the air pressure in the first tank chamber and the second tank chamber of each collection tank; The suction / discharge steps of the plurality of recovery tanks are continuously performed in parallel while delaying the timing of the absorption / discharge steps of the plurality of recovery tanks by a predetermined time, The discharge processes of the plurality of collection tanks are set at different times, and the predetermined delay time is set longer than the discharge process time of each of the plurality of collection tanks. A method for operating a recovery tank system.

5. each of the plurality of recovery tanks further includes a first control valve for connecting or separating the first tank chamber and the second tank chamber, and a second control valve for connecting or separating the second tank chamber and the outside; 5. The method for operating a recovery tank system according to claim 4, wherein the controller changes the air pressure in the first tank chamber and the second tank chamber by controlling the opening and closing of the first and second control valves, respectively.

6. The controller: a) opening the first opening / closing valve to allow the muddy water sucked into and stored in the first tank chamber to fall into the second tank chamber and be stored in the second tank chamber; b) closing the first opening / closing valve to store the sucked muddy water in the first tank chamber; c) opening the second opening / closing valve to discharge the muddy water stored in the second tank chamber; d) closing the second on-off valve; The method for operating a recovery tank system according to claim 4 or 5, wherein the steps a) to d) are repeated to perform continuous operation of the plurality of recovery tanks.

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