JP2973283B2 - Emergency shutdown method of mud transport equipment in mud shield system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for urgently stopping a muddy water transport facility in a muddy water shield method used for construction of a submarine tunnel.

[0002]

2. Description of the Related Art A plurality of devices (pumps, valves, etc.) are distributed and installed in a wide range in a muddy water transport system of a muddy water shield method in submarine tunnel construction or the like. Further, each equipment is moved according to the excavation movement of the excavator, and the distance between the equipments becomes longer as the construction progresses, and finally, the distance between the equipments becomes 1 km or more.

In the above-mentioned muddy water transport equipment, each device is controlled by connecting a control device installed near each device and a central monitoring and control device with a communication cable, and connecting the control device to the central monitoring and control device. , An instruction is given by an electric signal to collectively monitor and operate each device.

[0004] If the construction of the excavator advances and the communication cable is sequentially extended and lengthened accordingly, accidents such as disconnection of the communication cable occur frequently. If such an accident occurs, the operation must be stopped urgently if the muddy water transport equipment is in operation.However, if the equipment is not stopped according to the specified order, a water hammer will occur and a serious accident may occur. Connect. However, since a stop command cannot be given to each device, a large number of persons are dispatched to the place where each control device is installed, and each device is stopped according to a stop method specified by communication such as a telephone.

[0005]

As described above, the method of stopping a large number of persons by dispatching a large number of persons to the place where each control device is installed and communicating them by telephone or the like requires a long time for the person to go to a necessary place. There is a problem that it is not possible to cope when it is necessary to stop urgently. In addition, since each device is manually stopped, there is a problem that a serious accident may be caused by an erroneous operation or the like.

In order to solve the above-mentioned problems,
A method in which a large number of people are stationed at the installation location of each device, and a method of manually stopping each device in the event of an emergency, or setting a timer in each control device, starting the timer when the electric signal becomes abnormal, and starting each timer, There is also a method of stopping the operation alone. However, these methods have a problem that a large number of people must be resident, and a method of independently stopping the timer ignoring the original state of the muddy water transport equipment is not necessarily safe.

[0007] The present invention has been made in view of the above points, and in the case of an emergency stoppage of muddy water transport equipment, the muddy water in the muddy water shield construction method system that can be automatically and safely stopped by one-touch operation of one person in a short time. An object of the present invention is to provide an emergency stop method for transportation equipment.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an invention according to claim 1 is an excavator, a mud pump for sending mud to the excavator, and a mud pump for discharging mud from the excavator. A valve system for sending and discharging muddy water to the excavator, and a muddy water pipe and a muddy water pipe for connecting these,
Equipped with a mud pump control unit that drives and controls the mud pump, a mud pump control unit that drives and controls the mud pump, and a valve system control unit that controls the valve system. Each control unit is centrally monitored via a communication cable. In the muddy water transport facility in the muddy water shield construction method system configured to be monitored and controlled by the control unit, a suction pressure detection sensor for detecting a suction pressure of a mud pump, a discharge pressure detection sensor for detecting a discharge pressure, and a suction of a mud pump. A suction pressure detection sensor that detects pressure and a discharge pressure detection sensor that detects discharge pressure are provided, and in the event of an emergency stop, the mud pump control unit and the mud pump control unit operate the mud pump and mud pump in the current state. And the suction pressure and discharge pressure of each pump detected by each suction pressure detection sensor and discharge pressure detection sensor. By operating the emergency stop command means provided at a predetermined location, the valve system control unit operates each valve of the valve system in a predetermined order, and outputs a mud pump control unit and a mud pump control unit. Compares the stored suction pressure and discharge pressure of the mud pump and the discharge pump with the suction pressure and discharge pressure detected by the suction pressure detection sensor and the discharge pressure detection sensor. The mud pump and the mud pump are stopped under predetermined conditions.

Further, in the invention according to claim 2, a plurality of sludge pumps are connected in series by a sludge water pipe, and a sludge pump control unit corresponding to each sludge pump, A suction pressure detection sensor and a discharge pressure detection sensor are provided.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a mud shield construction method system for implementing an emergency shut down method for mud transport equipment of the present invention. In FIG. 1, reference numeral 1 denotes an excavator (shield machine), a valve system 2 that moves with the excavator 1 behind the excavator 1, and a mud pump 3 that discharges mud from the excavator 1. A mud pump 4 for sending mud is arranged on the ground, and a mud pump 5 for feeding mud is disposed on the ground.
And a wastewater pipe 7.

The muddy water pipe 6 and the muddy water pipe 7 are sequentially extended with the excavating movement of the excavator 1, and when the length becomes longer, a mud pump disposed at the rear end of the excavator 1 as necessary. A sludge pump is additionally connected between 3 and the final end sludge pump 4 and a sludge pump is additionally connected to the primary side of the excavator 1.

The valve system 2 has a valve V1 connected in series to the muddy water pipe 6, a valve V2 connected in series to the muddy water pipe 7, and an excavation connected between the muddy water pipe 6 and the muddy water pipe 7. A valve V3 for bypassing the machine 1;
These valves are controlled by a valve system control unit (control device) 8.
It is controlled by.

The sludge pump 3 is controlled by a sludge pump control unit 10 via a rotation speed controller 9. A suction pressure sensor 11 is provided on the suction side of the sludge pump 3, and a discharge pressure detection sensor 1 is provided on the discharge side.
The output of the suction pressure detection sensor 11 and the output of the discharge pressure detection sensor 12 are input to the sludge pump control unit 10.

The sludge pump 4 at the final end is controlled by a sludge pump control section (control device) 13.
Further, a suction pressure detection sensor 14 is provided on the suction side of the mud pump 4 and a discharge pressure detection sensor 15 is provided on the discharge side. The outputs of the suction pressure detection sensor 14 and the discharge pressure detection sensor 15 are The information is input to the pump control unit 13.

The sludge pump 5 is controlled by a sludge pump controller (control device) 16 via a rotation speed controller 17. Further, a suction pressure detection sensor 18 is provided on the suction side of the mud pump 5 and a discharge pressure detection sensor 19 is provided on the discharge side. The outputs of the suction pressure detection sensor 18 and the discharge pressure detection sensor 19 are the same as those of the mud pump. The data is input to the control unit 16.

The valve system controller 8, the sludge pump controller 10, the sludge pump controller 13, and the sludge pump controller 16 are connected to a central monitoring controller (central monitoring controller) 20 via a communication cable 21. Then, the central monitoring and control is performed. Then, the muddy water transport equipment is controlled by the central monitoring and control unit 20 in the face holding mode, the bypass mode,
The excavation mode, the bypass mode, and the face holding mode are repeated for each ring in a normal route, and the tunnel is excavated.

In the muddy water shield construction method system having the above-described configuration, when the muddy water transportation equipment is stopped from the normal digging operation state, the following procedure is performed. First, the valve V3 is opened, and then the valves V1 and V2 are closed. Next, the rotation speed of the mud pump 5 and the sludge pump 3 is slowly reduced to the minimum rotation speed. The sludge pump 4 at the last end is stopped, then the sludge pump 3 and finally the sludge pump 5 are stopped. By stopping the muddy water transport equipment in such a procedure, the equipment can be safely stopped without causing an accident such as a water hammer.

When a trouble such as disconnection of the communication cable 21 occurs during the excavation operation and the muddy water transport equipment is stopped urgently, the emergency stop is realized by the following method. When a communication error occurs, the sludge pump control unit 16 and each sludge pump control unit 1
0, 13 and the valve system control unit 8
The sludge pump 3, the sludge pump 4, and the valve system 2 are maintained in the current state (the pump rotation speed is fixed to the current state, and the valves V1, V2, and V3 are fixed to the current state). In this state, each control unit shifts to the standby state of the stop process, and stores the suction pressure and the discharge pressure of the sludge pump 3, the sludge pump 4, and the sludge pump 5. That is, the suction pressure detection sensors 11, 14, 18 and the discharge pressure detection sensors 12, 1,
The outputs of 5 and 19 are stored in each of the sludge pump control units 10 and 13 and the sludge pump control unit 16.

Subsequently, a human depresses a stop button (not shown) provided in the valve system controller 8. As a result, the valve system control unit 8 opens the valve V3 of the valve system 2 to fully open it, and closes the valves V1 and V2 to fully close them. This operation is performed by the valve system controller 8.
Is to do it alone.

When the valve V3 is fully opened, (a) the discharge pressure of the mud pump 5 drops below the discharge pressure stored in the mud pump control unit 16, and (b) the suction pressure of the mud pump 3. Rises from the suction pressure stored in the sludge pump control unit 8.

The mud pump control unit 16 slowly reduces the rotational speed of the mud pump 5 after waiting for the time when the valves V1 and V2 are fully closed from the state (a). Sludge pump control unit 10
Waits for the time when the valves V1 and V2 are fully closed from the above state (b) and slowly reduces the rotation speed of the sludge pump 5.

In the sludge pump 4, when the rotation speed of the sludge pump 5 and the sludge pump 3 decreases, the discharge pressure gradually decreases, and the pressure difference between the discharge pressure and the suction pressure increases. After a certain period of time, it is determined that the sludge pump 5 and the sludge pump 3 have reached the minimum rotational speed, and the sludge pump control unit 13 stops the sludge pump 4 at the final end.

Next, the sludge pump control unit 10 stores the pressure difference between the discharge pressure and the suction pressure when the sludge pump 3 reaches the minimum rotation speed, and the pressure difference becomes large and becomes constant. When the time has elapsed, it is determined that the sludge pump 4 has stopped, and the sludge pump 3 is stopped. Further, the mud pump control unit 16 stores the pressure difference between the discharge pressure and the suction pressure when the mud pump 5 reaches the minimum rotation speed, as in the case of the mud pump 3, and the pressure difference is large. After a certain period of time, it is determined that the sludge pump 3 has stopped, and the sludge pump 5 is stopped.

As described above, the mud pump control unit 16 checks the suction pressure, discharge pressure and pressure difference of each pump.
By stopping the sludge pump 5 and the sludge pump 3 respectively, the sludge pump control unit 10 can always safely stop the equipment without causing an accident such as a water hammer even during an emergency stop. In addition, since the emergency stop can be performed only by pressing the emergency stop push button provided in the valve system control unit 8, it is not necessary to arrange a large number of persons for the emergency stop.

In the above embodiment, the emergency stop command is issued by pressing the emergency stop button provided in the valve system control unit 8. However, the present invention is not limited to the push button. Any command can be issued as long as the command can be issued. Further, the location where the means for issuing the emergency stop command is provided is not limited to the valve system control unit 8, but may be any location that is easy to operate.

[0026]

As described above, according to the present invention, by operating the emergency stop command means provided in the valve system control section, the emergency stop command means provided in accordance with the suction pressure and discharge pressure of the mud pump and the mud pump. Since the sludge pump and the sludge pump are controlled and stopped, the following excellent effects can be obtained.

(1) In the conventional emergency stop method, a large number of people must be placed on an operation panel placed in each place, and the stop operation must be performed using a telephone or the like. A muddy water transportation facility can be safely stopped by a human.

(2) Conventionally, since a large number of people perform a stop operation while taking the timing by telephone communication, there is a danger of an accident or the like caused by an erroneous operation. Emergency shutdown of mud transport equipment can be safely performed.

(3) In the muddy water transport equipment, since each equipment is dispersed and has a very long distance, conventionally, it takes a long time until the stop operation is started, whereas the present invention is provided at a predetermined place. The stop operation can be started in a short time because the operation can be performed only by operating the emergency stop command means.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a muddy water shield construction method system for implementing an emergency stoppage method for muddy water transport equipment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator 2 Valve system 3 Mud pump 4 Mud pump 5 Mud pump 6 Mud water piping 7 Mud water piping 8 Valve system control unit 9 Speed controller 10 Mud pump control unit 11 Suction pressure detection sensor 12 Discharge pressure detection Sensor 13 Sludge pump control unit 14 Suction pressure detection sensor 15 Discharge pressure detection sensor 16 Mud pump control unit 17 Rotation speed controller 18 Suction pressure detection sensor 19 Discharge pressure detection sensor 20 Central monitoring control unit 21 Communication cable

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiichiro Onuki 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Corporation (72) Inventor Makoto Morikawa 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Inside Ebara Works, Ltd. (72) Inventor Akira Tanokura 11-1, Haneda Asahimachi, Ota-ku, Tokyo Intranet Co., Ltd. (72) Inventor Kazuhisa Watanabe 11-1, Haneda Asahimachi, Ota-ku, Tokyo Ebara Within Plant Construction Co., Ltd. (56) References JP-A-3-129909 (JP, A) JP-A-9-25786 (JP, A) JP-B 61-5217 (JP, B2) (58) Fields surveyed (Int.Cl. ⁶ , DB name) E21D 9/06 301

Claims (2)

(57) [Claims] An excavator, a mud pump for sending mud to the excavator, a mud pump for discharging mud from the excavator, a valve system for sending and discharging mud to the excavator and bypassing the same. Mud water pipe and mud water pipe, a mud pump control unit for driving and controlling the mud pump, a mud pump control unit for driving and controlling the mud pump, a valve system control unit for controlling the valve system, In the muddy water transport equipment in the muddy water shield construction method system configured to monitor and control each of the control units via a communication cable by a central monitoring control unit, a suction pressure detection sensor for detecting a suction pressure of the mud pump and a discharge pressure are provided. A discharge pressure detection sensor for detecting, a suction pressure detection sensor for detecting the suction pressure of the sludge pump, and a discharge pressure detection sensor for detecting the discharge pressure. A sensor, and in the event of an emergency stop, the mud pump control unit and the mud pump control unit maintain the operating state of the mud pump and the mud pump as they are, and the suction pressure detection sensor and the discharge pressure detection. By storing the suction pressure and the discharge pressure of each pump detected by the sensor and operating the emergency stop command means provided at a predetermined location, the valve system control unit operates each valve of the valve system in a predetermined order. The mud pump control unit and the mud pump control unit are configured to store the suction pressure and the discharge pressure of the stored mud pump and the mud pump, and the suction pressure and the discharge pressure detected by the suction pressure detection sensor and the discharge pressure detection sensor. Muddy water pump and mud pump are stopped under predetermined conditions when the result of the comparison becomes a predetermined state. Muddy water transport equipment emergency stop method in Rudo method system. 2. The sludge pump, wherein a plurality of sludge pumps are connected in series by the sludge water pipe, and the sludge pump control unit, the suction pressure detection sensor, and the water discharge corresponding to each of the sludge pumps. The method for urgently stopping muddy water transport equipment in a muddy water shield method according to claim 1, further comprising a pressure detection sensor.