JP2003106089A - Slurry treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new slurry treatment apparatus which ensures carrying of slurry in a slurry discharging tank even if the interior of the tank is kept in a negative pressure state due to driving of a suction device, and efficiently carries out slurry treatment concurrently with construction work according to the shield tunneling method. SOLUTION: The slurry treatment apparatus is comprised of the slurry discharging tank 4 which has its interior kept in the negative pressure state due to driving force of the suction device 8, and stores therein the slurry discharged from a shield machine 3, a slurry discharging pump 10 for discharging the slurry in the slurry discharging tank 4, a slurry discharging pipe 12 having one end thereof connected to the slurry discharging pipe 10, and an automatic on-off valve 13 arranged at a midpoint of the slurry discharging pipe 12. The automatic on-off valve 13 is opened after starting of driving of the slurry discharging pipe 10 and closed before stoppage of the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muddy water treatment device used for treating muddy water discharged from a shield machine by a shield construction method.

[0002]

2. Description of the Related Art Conventionally, for example, an earth pressure type semi-shielding machine,
Semi-sealed machines such as muddy water pressurized semi-shielded machines and mud-concentrated semi-shielded machines and / or semi-shielded construction methods using these machines (hereinafter referred to as shield machines) have a wide range of applicable soil properties and operability. Since it is also rich, it is widely used when constructing tunnels and other underground shafts and sewage pipes.

When performing such a shield construction method, the cutter head provided at the tip of the shield machine is rotated by driving a drive motor provided in the shield machine, and the excavated water content is high. Promote while taking in the mud (muddy water) inside. Further, the tip of the sludge discharge pipe is fixed inside the shield machine body. This sludge pipe is connected to the sludge tank installed on the ground at the base end side through the shield pipe following the shield machine and through the starting vertical shaft from the shield machine, and to this sludge tank. Is connected to an intake device that makes the inside of the sludge tank a negative pressure. That is, the muddy water discharged from the shield machine passes through the mud discharge pipe while being sucked by the driving force of the intake device,
It is expropriated in the sludge tank.

Further, a sludge pump for transferring the muddy water collected in the sludge tank to another treatment tank is arranged in the sludge tank, and the sludge pump is provided with another sludge pump. One end of a mud discharge pipe that serves as a passage for the mud transferred to the treatment tank is connected. Further, an automatic opening / closing valve is provided in the middle part of the sludge pipe, and when the driving of the sludge pump is started,
This automatic opening / closing valve is opened. That is, in the above-described conventional mud water treatment apparatus, when the inside of the mud discharge tank is made to have a negative pressure by driving the suction device, the mud water in the mud pipe is also made to have a negative pressure, and Passing through the pipe,
It is expropriated in the sludge tank. Moreover, in such a state,
When the automatic opening / closing valve is opened and the driving of the sludge pump is started, the muddy water collected in the sludge tank is transferred to another treatment tank through the sludge pipe.

[0005]

However, in the above-mentioned conventional muddy water treatment device, if the automatic opening / closing valve is opened while the intake device is being driven,
When the inside of the sludge tank is in a high negative pressure state, mud water flows backward from the sludge pipe, and the driving force of the sludge pump can transfer the mud water in the sludge tank to another treatment tank. Often not. However, in order to prevent such a situation, when the negative pressure state in the sludge tank by the intake device is relieved,
The muddy water in the mud discharge pipe cannot be efficiently transferred into the mud discharge tank. In order to prevent such a situation, when mud is transferred into the mud tank by the mud pipe, the operation of the mud pump is stopped, and conversely, when the mud pump is operated, the intake device is used. It is also possible to employ a method of stopping the driving of the engine and selectively driving the sludge pump and the intake device.
However, such a method not only hinders the efficiency of muddy water treatment, but also significantly hinders the efficiency of excavation work such as a horizontal shaft by a shield machine, which is one of the causes for significantly lengthening the construction period. .

Therefore, the present invention has been proposed in order to solve the problem of the above-mentioned conventional mud water treatment apparatus, and in the case where the inside of the sludge tank is set to a negative pressure by the drive of the intake device. Even if there is, it is an object of the present invention to provide a novel muddy water treatment device capable of reliably transferring muddy water in the mud discharge tank and efficiently performing both muddy water treatment and construction by a shield construction method at the same time. To do.

[0007]

The present invention has been proposed in order to achieve the above-mentioned object, and the first invention (the invention according to claim 1) is such that the inside is driven by the driving force of the intake device. A mud tank that collects mud water discharged from the shield machine under negative pressure, a mud pump that discharges mud in this mud tank, and a mud pipe that is connected to this mud pump at one end And an automatic opening / closing valve arranged in the middle of the sludge discharge pipe, the automatic opening / closing valve being opened after the start of driving the sludge pump and closed before the stop of the sludge pump. It is characterized by being configured as described above.

In the first aspect of the invention described above, when the mud water in the mud layer is transferred while the mud tank is in a negative pressure due to the drive of the suction device, first, the mud pump is operated. After starting driving, after starting driving of this sludge pump,
The automatic open / close valve is opened. Further, when stopping the transfer of the muddy water in the sludge tank, first, after the automatic opening / closing valve is closed, the driving of the sludge pump is stopped.

Therefore, according to the first aspect of the invention, when the transfer of the muddy water in the sludge tank is started, the driving of the sludge pump is started before the opening of the automatic opening / closing valve. Even when the inside of the sludge discharge tank is in a negative pressure state due to the drive of the intake device, the mud water does not flow backward from the sludge discharge pipe. Further, even when the transfer of the muddy water in the sludge tank is stopped, since the automatic opening / closing valve is closed before the driving of the drainage pump is stopped, the muddy water does not flow backward in the sludge pipe in the same manner.

The second invention (the invention according to claim 2)
In the first invention, the upper limit water level detection sensor for detecting the upper limit water level of the muddy water inside the drainage tank and the lower limit of the muddy water are provided above the suction port of the drainage pump. A lower limit water level detection sensor for detecting the water level is provided, and the drive of the automatic opening / closing valve and the mud pump is controlled by detecting the water level of the mud water by the upper limit water level detection sensor and the lower limit water level detection sensor. is there.

According to the second aspect of the invention, since the driving of the automatic opening / closing valve and the sludge pump is controlled by detecting the water level of the muddy water by the upper limit water level detection sensor and the lower limit water level detection sensor, it is transferred into the sludge tank. The difference between the amount of muddy water that is discharged and the amount of muddy water that is discharged from the sludge tank (that is, the difference between the driving force of the intake device and the driving force of the sludge pump) is balanced, and the muddy water is efficiently discharged. Can be processed. In particular,
In the second aspect of the invention, since the lower limit water level detection sensor is arranged above the suction port of the sludge pump, the sludge can be smoothly transferred at the start of driving the sludge pump. it can.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A muddy water treatment apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings, and an operation of this muddy water treatment apparatus will be described.

The muddy water treatment apparatus 1 according to this embodiment is
As shown in Fig. 1, it is installed on the ground,
A sludge discharge tank 4 connected to a shield machine 3 via a sludge discharge pipe 2 is a constituent element. A cutter head 5 is rotatably arranged at the tip of the shield machine 3, and a large number of cutter bits (not shown) for excavating the ground are fixed to the cutter head 5, and the cutter head 5 is also provided. A plurality of openings (not shown) are formed through which the mud having a high water content is taken in by excavation by the rotation drive of the. In addition, a drive motor (not shown) for rotationally driving the cutter head 3 is built in the shield machine 3, and a flow path 6 through which the muddy water flowing from the opening formed in the cutter head 5 flows is formed. Has been done. A discharge tank 7 for discharging muddy water is formed at the rear of this flow path, and one end of the mud discharge pipe 2 is provided with the discharge tank 7
It is connected to the.

The sludge discharge pipe 2 is connected to the sludge discharge tank 4 through the shield machine 3 and a large number of shield pipes (not shown) following the shield machine 3. The sludge tank 4 is connected to a blower 8 as an intake device constituting the present invention via an intake pipe 9, and the inside of the sludge tank 4 is brought into a negative pressure state by driving the blower 8. Therefore, the muddy water flowing into the shield machine 3 is driven by the blower 8 to pass through the mud discharge pipe 2 and flow into the mud discharge tank 4.

In the sludge tank 4, the sludge pump 1
0 is arranged, and this sludge pump 10 is arranged.
The sludge pump 10 is connected to the other end of a sludge pipe 12 whose one end is connected to the treatment tank 11. A pinch valve 13 as an automatic opening / closing valve of the present invention is arranged in the middle of the sludge discharge pipe 12, and an opening / closing control unit 14 is connected to the pinch valve 13.

A lower limit water level sensor 15 and an upper limit water level sensor 16 are arranged in the sludge tank 4. The lower limit water level sensor 15 is provided above the suction port (not shown) formed in the sludge pump 10 and through which the sludge flows into the sludge pump 10. The fact that the position of the lower limit water level sensor 15 has been reached is detected. Further, the upper limit water level sensor 16 is
It is arranged above the lower limit water level sensor 15 and near the top plate of the sludge tank 4.
The upper limit water level sensor 16
It is to detect that the position has been reached.

The blower 8, the sludge pump 10,
The opening / closing controller 14, the lower limit water level sensor 15, and the upper limit water level sensor 16 are each connected to a central processing unit (CPU) 17. This central processing unit (CPU) 17
When the water level of the muddy water is detected by the lower limit water level sensor 15 and the upper limit water level sensor 16, the blower 8,
The sludge pump 10 and the opening / closing control unit 14 are controlled as in the flowchart shown in FIG.

Hereinafter, according to the flow chart shown in FIG.
The operation of the muddy water treatment apparatus 1 according to this embodiment will be described.
For convenience of explanation, as shown in FIG.
A description will be given starting from the state where about half of the muddy water is filled.
In this state, the blower 8 is driven, the sludge pump 10 is also driven, and the pinch valve 13 is open. Therefore, the muddy water discharged from the shield machine 3 passes through the sludge pipe 2 and flows into the sludge tank 4, and from the sludge tank 4 through the sludge pipe 12 to the treatment tank 11 Have been transferred to. Then, in this state, in step st1, it is determined whether or not the water level of the muddy water in the sludge discharge tank 4 has dropped to reach the position where the lower limit water level sensor 15 is disposed, and the step s
When it is determined at t1 that the lower limit is reached, at step st2, the pinch valve 13 is first closed, and then at step st3, driving of the sludge pump 10 is stopped. In this state, the blower 8 is still driven, and when the mud water level is reached by the upper limit water level sensor 16 (step st4), the sludge pump 10 that has been stopped up to that step In st5, driving is restarted, and then in step st6, the pinch valve 13 which has been closed until then is opened. By such an operation, the muddy water in the sludge tank 4 passes through the sludge pipe 12 again, and is treated in the treatment tank 1
1 is transferred to.

Therefore, according to the muddy water treatment apparatus 1 of the above-described embodiment of the present invention, the blower 8 which is the intake device constituting the present invention is being driven, and the inside of the sludge discharge tank 4 is in a negative pressure state. However, when the sludge pump 10 starts to be driven, the pinch valve 13, which is an automatic opening / closing valve, is opened after the sludge pump 10 starts to be driven. There is no possibility that the mud water will flow back into the mud 4 and the mud water cannot be transferred by the mud pump 10. Further, even when the sludge pump 10 stops, the pinch valve 13 is closed before that, so that the sludge pipe 12 between the sludge pump 10 and the pinch valve 13 is filled with muddy water. Therefore, even when the driving of the sludge discharge pump 10 is started again, the muddy water can be reliably transferred.

[0020]

As is apparent from the above description of the embodiment of the present invention, according to the present invention (the invention according to claim 1), when the transfer of the muddy water in the sludge tank is started. Since the driving of the sludge pump is started before the automatic opening / closing valve is opened, even if the inside of the sludge tank is in a negative pressure state due to the driving of the suction device, The mud does not flow back from the mud pipe. Also,
Even when the transfer of the muddy water in the sludge tank is stopped, the automatic opening / closing valve is closed before the driving of the drainage pump is stopped, so that the muddy water does not flow backward in the sludge pipe in the same manner.

The second invention (the invention according to claim 2)
Then, by controlling the drive of the intake device by detecting the water level of the muddy water by the upper limit water level detection sensor, and by controlling the drive of the automatic opening / closing valve and the mud pump by detecting the water level of the muddy water by the lower limit water level detection sensor. , Balance of difference between the amount of muddy water transferred into the sludge tank and the amount of muddy water discharged from the sludge tank (that is, the difference between the driving force of the intake device and the driving force of the sludge pump) Therefore, muddy water can be efficiently treated. In particular, in the second aspect of the invention, since the lower limit water level detection sensor is arranged above the suction port of the sludge pump, the sludge can be smoothly transferred at the start of driving the sludge pump. be able to.

[Brief description of drawings]

FIG. 1 is a schematic view schematically showing a muddy water treatment device according to an embodiment of the invention.

FIG. 2 is a flowchart showing an operation of the muddy water treatment device.

[Explanation of symbols]

1 Muddy water treatment equipment 2 sludge pipe 3 shield machine 4 sludge tank 8 blowers 10 Sludge pump 12 Drainage pipe 13 pinch valve 15 Lower limit water level sensor 16 Upper limit water level sensor 17 Central processing unit (CPU)

Claims (2)

[Claims] 1. A drainage mud tank in which mud water discharged from a shield machine is taken into a negative pressure by a driving force of an intake device, a mud pump for discharging mud water in the mud tank, and one end A mud pipe connected to the mud pump and an automatic opening / closing valve arranged in the middle of the mud pipe are provided, and the automatic opening / closing valve is opened after the driving of the mud pump is started. In addition, the mud treatment device is configured so as to be closed before the stop of the mud pump. 2. An upper limit water level detection sensor for detecting an upper limit water level of the muddy water inside the mud discharge tank, and a lower limit water level of the muddy water which is arranged above the suction port of the mud discharge pump. The muddy water according to claim 1, further comprising a lower limit water level detection sensor, wherein the drive of the automatic opening / closing valve and the sludge pump is controlled by detecting the water level of the muddy water by the upper limit water level detection sensor and the lower limit water level detection sensor. Processing equipment.