KR101933091B1 - Tunnel system for controlling the inflow and control method thereof - Google Patents

Abstract

The present invention provides an inflow controllable tunnel system and a control method thereof. A tunnel installed at a lower part of the ground and set to a plurality of different sections having different inclination from neighboring sections; a water pressure sensor installed at least one in each of a plurality of sections of the tunnel and measuring an external water pressure; And a pump for discharging the fluid introduced from the valve to the outside and a pump for discharging the fluid introduced from the valve to the outside, And a controller for opening the valve and driving the pump when the measured water pressure is equal to or higher than a preset water pressure.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tunnel system,

The present invention relates to an apparatus and method, and more particularly, to an influent controllable tunnel system and a control method thereof.

Most of the construction and operation of tunnels takes place in the ground underground. In tunnel design, the influence of groundwater is a key design factor, and tunnel type is determined considering the purpose of tunnel use and the influence of surrounding structures on groundwater. Tunnel type considering the influence of groundwater can be divided into drain type tunnel and non-drain type tunnel according to the drainage condition.

The types of tunnels can be divided into NATM (New Austrian Tunneling Method) tunnels and segment tunnels. The majority of NATM tunnels constructed in Korea are generally constructed as drainage type tunnels and drainage systems are installed on the backside of the lining and are designed not to generate hydraulic pressure on the backside of the lining by allowing maximum inflow of groundwater.

On the other hand, the segment tunnel is constructed as a non-dividing tunnel which is designed to prevent groundwater from penetrating into the lining by completely watertighting the surrounding of the lining, unlike the NATM tunnel. Therefore, segment tunnels are generally not accompanied by drainage systems.

Superpole tunnels are constructed below the surface of the ground. In particular, it is constructed deeper than the deepest bottom of the section of a river or sea. Because of the characteristics of this installation location, the depth of the tunnel is deep, and a very large water pressure is applied depending on the depth of the upper part.

In particular, the submarine tunnels extend the tunnels because they connect the land between the land and the land in Bay, Bay, Fjord and Straits. This causes various complicated grounds to face each other along the length of the tunnel, resulting in various problems in each section of the tunnel end direction.

Both sides of the submarine tunnels should be installed on the ground and must be higher than the water level, but the deepest section appears because it has to pass under the seabed at the middle point of the tunnel. In other words, since the end slope of the tunnel can not be kept constant, the influent water naturally flows into the deepest part of the tunnel. The collected influent should be pumped out of the tunnel. In this process, the operation of the pump may be delayed for a while, or excessive flooding due to abnormal hydraulic pressure may cause submergence of the tunnel.

It is an object of the present invention to provide a tunnel system capable of controlling the hydraulic pressure of a tunnel and effectively controlling the fluid flowing into the tunnel to ensure the stability of the tunnel structure and to enhance the convenience of the user, . However, these problems are exemplary and do not limit the scope of the present invention.

According to an embodiment of the present invention, there is provided a tunnel structure, comprising: a tunnel installed at a lower portion of a ground, the tunnel being set to a plurality of different sections having different slopes from neighboring sections; And a pump installed between the neighboring drainage unit and discharging the fluid introduced from the valve to the outside, wherein the drainage unit includes a water pressure sensor for measuring a flow rate of the fluid, And a control unit for opening the valve and driving the pump when the water pressure measured among the plurality of sections and the measured water pressure is equal to or higher than a preset water pressure.

In addition, the pump may be installed in a first collection chamber where the fluid introduced from the valve during the plurality of collection chambers is stored.

The drainage unit may further include a flow meter for measuring a flow rate of the fluid passing through the valve, the control unit receiving information on the flow rate of the fluid passing through the valve in the flow meter, Using information on the distance between the pumps, calculating the time that the fluid passing through the valve reaches the pump, and driving the pump before the fluid arrives.

According to another embodiment of the present invention, there is provided a method for controlling influent water in a tunnel, the tunnel being installed at a lower portion of the ground and having a plurality of different sections having different slopes from the adjacent sections, Determining whether the measured hydraulic pressure is a predetermined threshold hydraulic pressure, opening the first valve to introduce an external fluid into the tunnel if the hydraulic pressure is equal to or higher than the threshold hydraulic pressure, Driving the first pump installed in the first collecting compartment before the fluid introduced into the first valve reaches the first collecting compartment adjacent to the first valve; Stopping the operation of the first pump when the water level is below the set minimum water level, re-measuring the water pressure externally applied to the tunnel by the water pressure sensor, And closing the first valve when the water pressure is less than a predetermined minimum water pressure.

In addition, the step of driving the first pump may drive the first pump when the flow rate passing through the first valve is equal to or greater than a predetermined set maximum flow rate.

The method of claim 1, further comprising: receiving information about a flow rate of the fluid passing through the first valve in the flow meter before driving the first pump, and using information about a distance between the first valve and the first pump, And calculating the time at which the fluid passing through the first valve reaches the first pump.

In addition, the installation position of the first valve may be higher than the installation position of the first collecting chamber.

According to an embodiment of the present invention as described above, the influent water-controllable tunnel system and the control method thereof can continuously monitor the hydraulic pressure acting on the tunnel and the underground water flowing into the tunnel to maintain the safety of the tunnel, The economic efficiency of management can be improved.

In addition, the inflow controllable tunnel system and the control method thereof can control the hydraulic pressure, which is a greatest risk factor in a tunnel system of high hydraulic pressure, so that the stability of the structure can be ensured and the user's convenience can be improved.

In addition, the inflow controllable tunnel system and its control method can overcome the difficulty of the management of local flaws and the lack of accessibility by adopting the automated system and monitoring the situation centrally. Of course, the scope of the present invention is not limited by these effects.

1 is a conceptual diagram showing an inflow water controllable tunnel system according to an embodiment of the present invention.
Fig. 2 is a sectional view showing the drainage unit of Fig. 1. Fig.
Fig. 3 is a cross-sectional view showing the dust collection of Fig. 1. Fig.
4 is a block diagram illustrating a portion of the configuration of the influent controllable tunnel system of FIG.
5 is a flowchart illustrating a method of controlling influent water in a tunnel according to another embodiment of the present invention.
6 is a flowchart illustrating a method of controlling influent water in a tunnel according to another embodiment of the present invention.
7A and 7B are graphs showing hydraulic pressure and flow rate relationships of the drainage unit of FIG. 2, respectively.
8A and 8B are graphs showing the relationship between the water level of the water collecting and the pump discharge amount in Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

On the other hand, when various elements such as layers, films, regions, plates and the like are referred to as being " on " another element, not only is it directly on another element, .

FIG. 1 is a conceptual diagram illustrating an inflow water controllable tunnel system according to an embodiment of the present invention.

Referring to FIG. 1, the inflow controllable tunnel system is a tunnel constructed under the ground below the ground. The inflow controllable tunnel system may be set to a plurality of different intervals A1 to An having different slopes from the neighboring intervals. The sections A1 to An can be classified into the section where the longitudinal gradient changes, the section where the hydraulic pressure is ideally generated, and the section where the lipid is classified in the rock classification.

The plurality of sections A1 to An may include drainage units P1 to Pn, dust collectors S1 to Sn, and a control unit 40. [ The drainage units P1 to Pn and the collectors S1 to Sn are installed in advance at the time of tunnel construction. The control unit 40 may be electrically or wirelessly connected to the drain units P1 to Pn and the collectors S1 to Sn.

Fig. 2 is a sectional view showing the drainage unit 20 of Fig. 1, Fig. 3 is a sectional view showing the water collection line 30 of Fig. 1, FIG.

Referring to FIGS. 2 and 4, at least one drainage unit 20 may be installed in each section of the tunnel system. The drainage unit 20 can introduce the fluid outside the tunnel 10 into the interior. The drainage unit 20 may include a water pressure sensor 21, a valve 22 and a flow meter 23.

The water pressure sensor 21 measures the water pressure acting on the outer wall of the tunnel 10 and can transmit the data on the water pressure to the control unit 40.

The valve 22 is installed at one side of the tunnel 10 and can connect the inside and the outside of the tunnel 10. The valve 22 is opened when the hydraulic pressure acting on the outer wall is equal to or higher than a predetermined limit hydraulic pressure, so that the external fluid acting on the tunnel 10 can be introduced into the valve 22. The valve 22 may be electrically or wirelessly connected to the controller 40 to receive an opening / closing signal and an opening / closing signal of the controller 40.

The flow meter 23 is capable of measuring the flow rate through the valve 22. The flow meter 23 can measure data on the flow rate or flow rate of the fluid passing through the inside of the tunnel 10 and can transmit the data to the control unit 40. If the flow rate measured by the flow meter 23 is equal to or greater than a predetermined set maximum flow rate, that is, a flow rate that is necessary for the pump 30 to be operated in advance, the control unit 40 can generate a signal for driving the pump .

Referring to FIGS. 3 and 4, at least one collection crystal 30 may be disposed between each section or each section of the tunnel system. The collection tank 30 can collect the fluid introduced through the drainage unit 20. The collecting unit 30 may include a pump 31 and a water level measuring unit 32.

The pump 31 can discharge the fluid collected in the collecting compartment 30 to the outside. The water level measuring unit 32 may measure the water level of the water collecting unit 30 and transmit the measured water level to the control unit 40. The control unit 40 can generate the operation signal or the stop signal of the pump 31 based on the data on the level of the water collection 30.

The control unit 40 may be connected to the drainage unit 20 and the collecting unit 30. The control unit 40 can receive data on the external water pressure of the tunnel 10 by the water pressure sensor 21. [ The control unit 40 can open the valve 22 by generating a signal to open the valve 22 if the external hydraulic pressure is equal to or higher than a predetermined hydraulic pressure that is a predetermined hydraulic pressure capable of ensuring the safety of the tunnel 10.

The control unit 40 can receive data on the flow rate or the flow rate of the fluid passing through the drainage unit 20 from the flow meter 23. If the flow rate passing through the drainage unit 20 is equal to or more than a predetermined set maximum flow rate, that is, a flow rate that is necessary for operating the pump 31 beforehand in the collection tank 30, a signal for driving the valve 22 is generated can do. The pump 31 that needs to be operated in advance can be defined as a pump 31 installed in the collection tank 30 in which the fluid introduced through the valve 22 first arrives.

Further, the control unit 40 can calculate the time point at which the drive signal of the pump 31 is transmitted. The control unit 40 calculates data on the inclination between the valve 22 and the pump 31, data on the distance between the valve 22 and the pump 31, the flow rate or flow rate of the fluid delivered from the flow meter 23 It is possible to calculate the time taken for the fluid that has passed through the valve 22 to reach the collecting filter 30. Then, the control unit 40 transmits the driving signal of the pump 31 to the pump 31 before the calculated time to discharge the fluid stored in the collection tank 30 to the outside.

That is, the control unit 40 receives the information on the flow rate of the fluid passing through the valve 22 in the flow meter 23 and the information on the distance and inclination between the valve 22 and the pump 31 A step of calculating the time for the fluid passing through the valve 22 to reach the pump 31 and the step for driving the pump 31 before the fluid discharged from the valve 22 reaches the collector 30 Lt; / RTI >

The control unit 40 checks whether the storage space of the collection unit 30 needs to be secured through the data on the flow rate or the flow rate of the fluid flowing from the outside and activates the pump 31 in advance to control the collection unit 30 The inflow water of the tunnel 10 can be stably managed by securing a space for storing the external fluid.

5 is a flowchart illustrating a method of controlling influent water in a tunnel according to another embodiment of the present invention.

Referring to FIG. 5, a method of controlling inflow water flowing into a tunnel includes a step S10 of measuring a hydraulic pressure acting on a tunnel, a step S20 of determining whether the measured hydraulic pressure is a preset hydraulic pressure limit, A step S30 of opening the valve to open the valve and introducing the external fluid into the tunnel if the pressure is equal to or higher than the hydraulic pressure, And stopping the operation of the first pump (S52) if the water level of the collection water is less than a predetermined minimum use water level.

In the method of controlling the inflow water flowing into the tunnel, the step S10 of measuring the hydraulic pressure acting on the tunnel can measure the pressure acting on the tunnel 10 by the water pressure sensor 21 installed at one side of the tunnel 10 . The tunnel system is divided into a plurality of sections, and a plurality of drainage units 20 are installed in each section. Since the drainage unit 20 is connected to the control unit 40, the control unit 40 can monitor the water pressure acting on each section of the tunnel 10 in real time.

The step S20 of determining whether the measured water pressure is a predetermined limit water pressure can determine whether the monitored water pressure in each section may affect the stability of the tunnel 10. [ The critical water pressure is the maximum water pressure which does not affect the stability of the tunnel 10. Thus, if the measured water pressure is above the threshold water pressure, the stability of the tunnel 10 is at risk.

If the water pressure is equal to or higher than the threshold water pressure, step S30 of opening the valve and introducing the external fluid into the tunnel can lower the water pressure around the tunnel 10 by opening the valve 22. [ The control unit 40 generates a signal to open the valve 22 when the water pressure is equal to or higher than the threshold water pressure, and transmits the signal to the valve 22 so that the valve 22 is opened. External fluid can be introduced into the interior of the tunnel 10 in the region of the tunnel 10 having a high local water pressure.

In addition, it may further include a step S31 of determining whether the fluid flowing through the valve 22 is equal to or greater than a predetermined set maximum flow rate. The set maximum flow rate is such that it is necessary to secure the storage space of the collection tank 30 because a large amount of influent water is generated. That is, the introduced fluid is stored in the collecting chamber 30, which is located at a position lower than the valve 22 and located at the nearest position. If there is no storage space for the fluid flowing into the collection tank 30, the stability of the interior of the tunnel 10 may be deteriorated. Therefore, the control unit 40 determines whether or not the flow rate of the inflow fluid is equal to or greater than the preset maximum flow rate. If the flow rate is smaller than the preset maximum flow rate, sufficient storage space is secured in the collection chamber 30, ) And can be stored.

If the flow rate is equal to or greater than the predetermined maximum flow rate, the control unit 40 calculates the time for the fluid passing through the valve to reach the pump for driving the pump 31 installed in the collecting unit 30, (S40) of discharging the fluid to the collection fixture.

In the step S32 of calculating the time for the fluid passing through the valve to reach the pump, the control unit 40 calculates the data on the flow rate and the flow rate of the fluid, the data on the distance between the valve 22 and the pump 31, The time required for the fluid discharged from the valve 22 to reach the pump 31 can be calculated by using data on the gradient between the pump 22 and the pump 31. [ The control unit 40 can drive the pump 31 in a flexible manner using the time required for reaching the collection unit 30.

The control unit 40 can operate the system flexibly by driving the pump 31 within the calculated time (see Fig. 8A). In addition, when the water pressure is urgently increased at one point of the tunnel 10, since the minimum time is secured until the pump 31 is operated, the water pressure can be adjusted by adjusting the opening degree of the valve 22.

Thereafter, a step S50 of measuring the level of collecting water may be provided. The control unit 40 can continuously monitor the level of the water collecting 30 through the water level measuring unit 32. [ (S51) of determining whether the measured water level is lower than a predetermined minimum water level, that is, a minimum water level necessary for use in a tunnel. If the water level of the collection tank 30 is below the lowest used water level, the driving of the pump 31 is stopped (S52). If the lowest used water level is exceeded and the fluid continues to flow in the valve 22, .

Referring to FIG. 6, step S60 of re-measuring the hydraulic pressure acting on the outside of the tunnel may determine whether the measured hydraulic pressure is equal to or less than a predetermined minimum hydraulic pressure. The minimum water pressure can be defined as the water pressure acting on the tunnel in a stable state where the stabilization of the tunnel is finished. Thereafter, if the re-measured water pressure is equal to or less than the predetermined minimum water pressure, the step of closing the valve (S61) may be performed.

6 is a flowchart illustrating a method of controlling influent water in a tunnel according to another embodiment of the present invention.

Referring to FIG. 6, the hydraulic stability control of the tunnel system and the inflow water control method of the tunnel in terms of inflow water management can be described.

First, in terms of hydrostatic stability management, it is determined whether the tunnel hydraulic pressure is equal to or higher than a predetermined threshold hydraulic pressure (S20). If the hydraulic pressure is equal to or higher than the threshold hydraulic pressure, the hydraulic pressure valve is opened (S30).

If the water pressure does not decrease, it is determined that the drainage unit 20 is abnormal. Accordingly, the control unit 40 can generate the inspection check signal (S36). The user can perform the maintenance or repair work of the tunnel system through the inspection check signal.

If the hydraulic pressure decreases, it is determined whether the set minimum hydraulic pressure has been reached (S60). If the hydraulic pressure reaches the set minimum hydraulic pressure, the hydraulic system can be closed (S61).

If the hydraulic pressure valve is opened in step S30, the control unit 40 can determine whether the flow rate measured by the flow meter 23 is equal to or greater than the preset maximum flow rate (S31). At the same time, it can be determined whether the measured flow rate is equal to or greater than the limit flow rate (S37). The limit flow is defined as the flow rate corresponding to the limit of the flow into the tunnel and can be set as an emergency in the tunnel system.

If the measured flow rate is equal to or greater than the limit flow rate, the tunnel shielding system (not shown) may be operated (S38). The tunnel shielding system is an inflatable material previously installed in the tunnel, and can prevent foreign inflow water generated due to destruction of the tunnel by being in close contact with the lining surface of the tunnel 10 in an emergency.

From the viewpoint of influent water management, the pump 31 can be operated when the measured flow rate is equal to or greater than the set maximum flow rate, or is less than the limit flow rate. The pump 31 is defined as a pump installed in the collection tank 30 where the introduced fluid first arrives. Therefore, the pump 31 is installed at a lower position than the valve 22, and is installed so as to be spaced apart from the valve 22.

Further, the control unit 40 may continuously monitor the water level of the water collecting 30 and determine whether the water level of the water collecting correction is equal to or higher than the set water level defined as the water level which is required to lower the water level in the house correction (S39 ). If the water level is equal to or higher than the set water level, the pump can be operated to secure the stability of the water purifying filter 30.

After the pump 31 is operated, it is determined whether the water level of the water collecting 30 corresponds to the minimum water level, that is, the minimum water level necessary for the water used in the tunnel (S51). If the water level corresponds to the minimum water level, (S52).

The influent water control method of the tunnel can control the hydraulic stability by locally introducing the external fluid into the tunnel 10 in a region where the water pressure is high. In addition, it is possible to monitor the flow rate and water pressure of the drainage unit 20 to monitor whether the tunnel is in an emergency or maintenance is required in real time.

The influent water control method of the tunnel can monitor the water level of the water collecting 30 to ensure the stability of the water collecting 30. In addition, when the fluid flows into the tunnel 10, the storage space of the collecting filter 30 can be enlarged by securing a space in which the influent water is stored.

7A and 7B are graphs showing hydraulic pressure and flow rate relationships of the drainage unit 20 of FIG. 2, respectively.

Referring to Figs. 7A and 7B, Stage A represents the water pressure acting on the tunnel 10 in a stable state of the tunnel system. At the first point (A), when the hydraulic pressure exceeds the set value, the valve (22) is opened and the flow rate to be introduced rapidly increases. Thereafter, in Stage B, the hydraulic pressure of the tunnel 10 is lowered and at the second point B corresponds to the set minimum hydraulic pressure (normal hydraulic pressure), so that the valve 22 is closed and the flow rate through the drainage unit 20 is rapidly reduced Maintain the normal flow rate.

8A and 8B are graphs showing the relationship between the water level and the pump discharge amount of the water collecting 30 of FIG.

Referring to FIGS. 8A and 8B, the stage A represents the water level of the collection tank 30 in a stable state of the tunnel system. The valve 22 is opened at the first point A in FIG. 7A but is installed at a predetermined distance between the valve 22 and the water collecting 30 so that during the time when the inflow water reaches the water collecting 30, (31) can be operated. The pump discharge increases sharply during the time the pump 31 is running, and the discharge can be reduced when the pump is stopped.

Undersea super-long tunnels receive hundreds of meters of water pressure at a depth of 50 km or more. In this case, structural water pressure resistance of the tunnel and influent water control are important problems. To do this, we will operate hydraulic pressure gauge, flow meter installation, collection and drainage pumping station. However, the hydraulic pressure and the inflow conditions can be changed by various factors, so it is almost impossible to directly control and manage the operation of the subsea tunnel.

Influent controllable tunnel system and its control method can monitor the water pressure and underground water flow in submarine underground tunnels during operation to maintain the safety of tunnels and to maintain economical efficiency through effective optimum operation .

The inflow controllable tunnel system and its control method can control the hydraulic pressure which can be the greatest risk factor in the tunnel system of high water pressure, so that the stability of the structure can be ensured and the convenience of the user can be improved.

The influent controllable tunnel system and its control method can overcome the difficulties and lack of access to the local flaw elements, which is characteristic of the superpole tunnels, by adopting the automated system and monitoring the situation centrally.

Unless there is explicitly stated or contrary to the description of the steps constituting the method according to the invention, the steps may be carried out in any suitable order. The present invention is not necessarily limited to the order of description of the above steps. The use of all examples or exemplary language (e.g., etc.) in this invention is for the purpose of describing the present invention only in detail and is not intended to be limited by the scope of the claims, But is not limited thereto. It will also be appreciated by those skilled in the art that various modifications, combinations, and alterations may be made depending on design criteria and factors within the scope of the appended claims or equivalents thereof.

Accordingly, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all ranges that are equivalent to or equivalent to the claims of the present invention as well as claims Category.

10: Tunnel
20: Drain unit
21: Hydraulic pressure sensor
22: Valve
23: Flowmeter
30: Edit the house
31: Pump
32:
40:

Claims (7)

A tunnel installed at a lower part of the ground, the tunnel being set to a plurality of different sections having different slopes from neighboring sections;
A drainage unit provided at least one in each of a plurality of sections of the tunnel and including a water pressure sensor for measuring an external water pressure and a valve for introducing an external fluid of the tunnel into the tunnel;
A plurality of dust collecting units installed between adjacent ones of the drainage units and having a pump for discharging the fluid introduced from the valves to the outside; And
And a control unit for opening the valve and driving the pump when the measured water pressure measured in the plurality of intervals is equal to or greater than a preset water pressure,
The control unit
Wherein the valve is driven to drive the first condensate pump which is closest to the first drainage unit in which the valve is opened, wherein, in consideration of the time at which the fluid discharged from the first drainage unit reaches the first collection, Wherein the pump is driven before the first collection correction is reached. The method according to claim 1,
Wherein the pump is installed in a first collection chamber where the fluid introduced from the valve during the plurality of collection chambers is stored. The method according to claim 1,
Wherein the drainage unit further comprises a flow meter for measuring a flow rate of the fluid passing through the valve,
The control unit
Receiving information on the flow rate of the fluid passing through the valve in the flow meter;
Calculating a time at which the fluid passing through the valve reaches the pump, using information on the distance between the valve and the pump; And
And driving the pump prior to the fluid reaching the inlet. A method for controlling an influent of a tunnel installed in a lower part of a ground, the tunnel being set to a plurality of different sections having different slopes from neighboring sections,
Measuring a hydraulic pressure applied to the outside of the tunnel by a hydraulic pressure sensor installed in the tunnel;
Determining whether the measured water pressure is a predetermined limit water pressure;
Opening the first valve and introducing an external fluid into the tunnel if the water pressure is equal to or higher than the threshold water pressure;
Driving a first pump installed in the first collecting chamber before the fluid discharged from the first valve reaches a first collecting closest to the first valve;
Stopping the operation of the first pump when the first collecting water level is lower than a predetermined lowest used water level; And
Measuring the hydraulic pressure acting on the outside of the tunnel by the hydraulic pressure sensor and closing the first valve when the hydraulic pressure is below the predetermined minimum hydraulic pressure,
Wherein the controller drives the first pump in consideration of a time at which the fluid discharged from the first valve reaches the first collection. 5. The method of claim 4,
Wherein the step of driving the first pump comprises:
And the controller drives the first pump when the flow rate passing through the first valve is equal to or greater than a predetermined set maximum flow rate. 5. The method of claim 4,
The method comprising: receiving information on a flow rate of a fluid passing through the first valve in a flow meter before driving the first pump; and using information about a distance between the first valve and the first pump, 1 < / RTI > valve to the first pump, and calculating the time that the fluid passing through the one valve reaches the first pump. 5. The method of claim 4,
Wherein the installation position of the first valve is higher than the installation position of the first collection.

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