JPH0816436B2 - Stable mud supply device for shield machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for supplying muddy water to a shield machine used in a muddy water shield construction method.

[0002]

2. Description of the Related Art In a shield machine used in the muddy water shield method, it is necessary to send (muddy water) muddy water (referred to as "stable muddy water") having a specific gravity and viscosity adjusted in order to stabilize the cutting face. . A large amount of discharged mud water generated during excavation is treated as industrial waste in the mud treatment equipment, but part of it is adjusted to stable mud in the adjustment tank in the mud treatment equipment and then sent to the excavator again. Be reused.

In the muddy water treatment facility in the muddy water shield method, one or two adjusting tanks have been conventionally provided. Fig. 2 shows the configuration of the main part of the muddy water treatment facility provided with one adjusting tank.

The waste mud water generated by the shield machine 30 is
First, it is sent to the dewatering sieve 12 by the drainage water pump P2 provided in the drainage water pipe 34. The waste water sent to the dewatering sieve 12 has gravel and sand removed therefrom, and then the lower water tank 14
And is sent to the wet cyclone 16 by the sieve pump P5. The discharged mud water sent to the cyclone 16 is the cyclone 1
It is rotated along the wall of 6. As a result, of the discharged mud water, one having a large specific gravity falls, and one having a small specific gravity (fine mud particles) flows into the adjusting tank 60 over the cyclone 16 (the upper center hole thereof).

Since a part of the waste mud water that has flowed into the adjusting tank 60 is reused, the rest is sent to a mud storage tank (not shown) for processing as industrial waste. Further, the adjusting tank 60 is supplied with dilution water, mud content, etc. for adjusting the specific gravity and viscosity, and is agitated with the reused muddy water by the agitating blades provided therein. As a result, part of the discharged mud that flows in from the cyclone 16 is adjusted to stable mud,
It is sent from the adjustment tank 60 to the shield machine 30 by the mud water pump P1 provided in the mud water pipe 32.

As can be seen from the above description, the adjusting tank 60 in the muddy water treatment facility of FIG. 2 has a plurality of roles such as receiving the discharged muddy water that overflows from the cyclone 16, adjusting it to stable muddy water, and sending muddy water to the shield machine. Fulfill.

In the conventional muddy water treatment equipment, as described above, only one adjusting tank is often provided, but there are also cases where two adjusting tanks are provided. When there are two adjusting tanks, one is used to send the adjusted stable mud to the shield machine, while the other one adjusts the discharged mud received from the cyclone 16 to the stable mud. . However, if the digging distance becomes longer or the digging cross section becomes wider, the amount of mud water sent per unit time increases, so that one adjusting tank must fulfill multiple roles, as in the case of only one unit. .

[0008]

When one adjusting tank plays a plurality of roles as described above, the specific gravity and viscosity of the muddy water sent to the shield machine 30 are constantly changing, and are accurately stable. It cannot be called muddy water. Therefore, the face may become unstable. In addition, it is necessary to carry out the sending and discharging mud water for a long time even while the shield machine is stopped in order to prevent sedimentation and siltation in the sending and discharging mud water pipe. This will shorten the service life of the pump and the mud pipe.

On the other hand, the scale of recent tunnel construction is increasing more and more, and long-distance and large-section excavation is being carried out. In response to this, the amount of mud water sent to the shield machine is also increasing, so a large-capacity adjusting tank is required, and it takes a long time to adjust specific gravity and viscosity (adjusting to stable mud water).

In view of the above, the present invention provides a stable mud supply device for a shield machine, which enables accurate and accurate adjustment to stable mud in a short time, and which eliminates the need for sending and discharging mud while the shield machine is stopped. To aim.

[0011]

SUMMARY OF THE INVENTION In the present invention made to solve the above problems, drainage mud accompanied by excavated soil generated by a shield machine is received via a drainage mud pipe, a dewatering sieve and a wet cyclone, After adjusting to specific gravity and viscosity,
In a stable muddy water supply device for a shield machine, which includes an adjusting tank for sending back to a shield machine through a mud water pipe, at least three adjusting tanks, and a muddy water receiving valve provided between each adjusting tank and the drain mud pipe. And a muddy water delivery valve provided between each adjusting tank and the muddy water pipe, a detection means for detecting the amount of muddy water in each adjusting tank, and a first role of opening the muddy water receiving valve to receive the muddy water, The second role of adjusting the received muddy water to a predetermined specific gravity and viscosity with the muddy water receiving valve and the muddy water delivery valve closed, and opening the muddy water delivery valve of stable muddy water adjusted to the predetermined specific gravity and viscosity. Control means for opening and closing the muddy water receiving valve and the muddy water sending valve based on the detecting means so that each adjusting tank sequentially and cyclically plays at least three roles of the third role of sending out to the mud sending pipe. Characterized in that it comprises a. In addition,
In order to improve the stirring function of the adjusting tank, it is preferable to provide each adjusting tank with a stirring pump for discharging the muddy water sucked from the bottom of the adjusting tank to the upper part of the adjusting tank. Further, in order to stop the sending and discharging mud water with the stop of the shield machine for each ring excavation, in the stable mud water supply device for the shield machine according to claim 1, it is provided near the shield machine, A bypass pipe connecting the water pipe and the drainage mud pipe, a first valve provided between the point at which the bypass pipe is connected in the mudwater pipe and the shield machine, and a bypass pipe in the drainage mud pipe A second valve provided between the point and the shield machine, a third valve provided in the bypass pipe, a mud water pump provided in the mud water pipe, and a drain mud pump provided in the drain mud pipe. After closing the shield machine, after closing the first valve and the second valve and opening the third valve, after filling the inside of the mud water pipe and the inside of the discharged mud water pipe with stable mud water adjusted to a specific gravity and viscosity ,
It is good to have a sending and discharging mud water control means for stopping the mud sending pump and the discharged mud pump.

[0012]

The control means controls the opening and closing of the muddy water receiving valve and the muddy water sending valve of each adjusting tank, so that each adjusting tank is
Play the first, second, and third roles sequentially and cyclically. That is, the adjustment tank in which the muddy water receiving valve is opened and the muddy water sending valve is closed receives waste muddy water accompanied by excavated soil generated by the shield machine (first role), and both the muddy water receiving valve and the muddy water sending valve are closed. The adjusted tank adjusts the specific gravity and viscosity of the muddy water (second role), and the adjusting tank with the muddy water reception valve closed and the muddy water delivery valve opened is stable muddy water (the muddy water adjusted to the specified specific gravity and viscosity. ) Is sent to the mud water pipe (shield machine) (third role). And, when paying attention to one adjusting tank, its role is the first role (receiving function) → the second role (adjusting function).
→ The third role (sending function) → the first role (receiving function), and the switching is performed sequentially and cyclically. When the operation of the adjusting tank is controlled in this way, there is no inflow or outflow of the muddy water into the adjusting tank that adjusts the specific gravity and viscosity of the muddy water, so it is possible to accurately adjust the muddy water to a predetermined specific gravity and viscosity. it can. Further, when the detecting means detects that the amount of stable mud water in the adjusting tank which plays the third role (delivery function) has decreased to a predetermined lower limit value, the adjustment which plays the second role (adjustment function). By making the tank perform the third role (delivery function) (by switching the role), it is possible to continue the mud water supply to the shield machine. However, the adjustment of specific gravity and viscosity in the adjusting tank must be completed at the time of this switching. When the amount of muddy water required by the shield machine increases, the adjustment may not be completed at the time of this switching, but in this case, the number of adjusting tanks is increased and the first, second, and third
One control tank is assigned to each role of, and the control means opens and closes each muddy water reception valve and muddy water delivery valve so that the adjusted muddy water (stable muddy water) is stored in the remaining adjustment tank and kept waiting. You can control it.

As described in claim 2, it is preferable to provide a stirring pump for discharging the muddy water sucked from the bottom of the adjusting tank to the upper part of the adjusting tank. Conventionally, stirring in the adjusting tank has been performed only by the stirring blades provided inside, but when a stirring pump is provided, stirring is also performed by this and the mud is homogenized. And the time required to adjust to viscosity is reduced.

As described above, according to the present invention, the muddy water is accurately adjusted to have a predetermined specific gravity and viscosity. Therefore, when the shield machine is stopped, sedimentation in the muddy water pipe and the muddy water pipe is prevented.
The sending and discharging mud water for preventing silt becomes unnecessary, and it becomes possible to stop the sending and discharging mud water with the stop of the excavator for each ring excavation. In order to realize this concretely, claim 3
The configuration described in 1. may be used. According to this configuration, the sending / discharging muddy water control means closes the first valve and the second valve and opens the third valve after the shield machine is stopped.
As a result, mud water (stable mud water) adjusted to a specific gravity and viscosity in the adjustment tank is sent to the mud water pipe and flows to the mud water pipe via the bypass pipe, so the mud water pipe and the mud water pipe are stable. Filled with muddy water. Then, the sending and discharging mud water control means stops the mud sending pump and the discharged mud pump. This stop will continue until the shield machine is restarted.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stable mud supply device for a shield machine according to an embodiment of the present invention will be described below with reference to FIG. FIG.
2 corresponds to FIG. 2 showing a configuration of a main part (conventional example) in a conventional muddy water treatment facility. The device of this embodiment is
As in the conventional example of FIG. 2, the dehydration screen 12, the lower water tank 14, the wet cyclone 16, the mud water pipe 32, the mud water pipe 34, the mud water pump P1, the mud water pump P2, and the sieve pump P5 are provided. These operations are also similar to the conventional example. However, in the conventional example, there is only one adjusting tank, but in the apparatus of this embodiment, a plurality (4 groups) of adjusting tanks 21 to 24 are provided. Then, each adjusting tank is provided with a stirring pump P4 for discharging the muddy water sucked from the bottom of the adjusting tank to the upper part (only the stirring pump P4 of the adjusting tank 21 is shown in FIG. 1).
In order to control the inflow of muddy water that has passed over the cyclone 16 (hereinafter referred to as "cyclone over muddy water"), the muddy water receiving valves VI21 to VI24 are used to control the inflow of diluting water or mud for adjusting the specific gravity and viscosity. Adjustment valve VT
21 to VT24 (only one adjusting valve is shown in one adjusting tank in FIG. 1, but in reality, adjusting valves corresponding to dilution water and mud are provided separately) , Mud storage valves VS21 to VS24 for controlling the delivery of muddy water to the mud tank, and muddy water delivery valves VO21 to VO2 for controlling the delivery of stable mud to the mud water pipe 32.
4 are provided respectively. In addition, each adjusting tank is provided with liquid level gauges S21 to S24 for detecting the amount of muddy water therein, and the valve V based on the detection signals of these liquid level gauges.
I21 to VI24, VT21 to VT24, VS21 to VS2
4, and a control unit 40 for controlling the opening and closing of VO21 to VO24
It has. Further, a bypass pipe 36 that connects the mud water pipe 32 and the drain mud water pipe 34 is provided in the vicinity of the shield machine 30, and the bypass pipe 3 is provided in the mud water pipe 32.
Between the point where 6 is connected and the excavator 30 the first valve V1
The second valve V2 is provided between the point at which the bypass pipe 36 is connected in the drainage mud pipe 34 and the excavator 30, and the third valve V3 is provided in the bypass pipe 36.

In the apparatus of this embodiment having the above-mentioned structure, when the shield machine 30 is operating, the first valve V1 and the second valve V2 are in the open state, and the third valve V3 is in the closed state. Similarly to the conventional example, the discharged mud water generated by the excavator 30 is sent to the dewatering sieve 12 by the mud water pipe 32. The waste mud water sent to the dewatering sieve 12 is sent to the cyclone 16 after removing gravel and sand therefrom. The muddy water that has passed over the cyclone 16 flows into any of the adjusting tanks 21 to 24.

In this embodiment, each adjusting tank receives cyclone-over mud water (exhaust mud water), adjusts the discharged mud water to a predetermined specific gravity and viscosity (adjusts to stable mud water), waits after adjusting the stable mud water, and advances. The control unit 40 controls the valve V so that the stable muddy water is sent to the machine 30 sequentially and cyclically.
I21 to VI24, VT21 to VT24, VS21 to VS2
4 and control the opening and closing of VO21 to VO24. For example,
The role that the adjusting tank 21 receives the cyclone over mud,
When the adjusting tank 22 performs a role of adjusting to stable mud, the adjusting tank 23 stores the stable mud and stands by, and the adjusting tank 24 serves to send the adjusted stable mud to the excavator 30, respectively, The control unit 40 controls the muddy water receiving valve VI2.
Open 1 to close VI22 to VI24 and adjust valve VT2
1, 24 are closed to open VT22 and VT23, the mud storage valve VS21 is opened to close VS22 to VS24, and the mud water delivery valves VO21 to VO23 are closed to open VO24. However, the adjusting valves VT22 and VT23 are used after the amounts of dilution water and mud necessary for adjusting the discharged mud water to a predetermined specific gravity and viscosity (adjusting to stable mud water) are supplied to the adjusting tanks 22 and 23. The mud storage valve VS21 is closed, and the sludge storage valve VS21 stores the waste sludge that is treated as industrial waste without being reused (not shown).
It will be closed after being sent to.

Under the control of each valve by the controller 40, the adjusting tank 24 supplies the stable mud to the excavator 30. When the control section 40 detects that the level of the stable mud water in the adjusting tank 24 has dropped to a predetermined lower limit by the signal from the liquid level gauge S24, the mud water delivery valve VO24 is closed,
Open the mud storage valve VS24 and the mud water reception valve VI24. As a result, the role of the adjusting tank 24 is switched from the delivery of stable mud to the reception of cyclone over mud.

The adjusting tank 23 stores the stable mud, which has already been adjusted, in a standby state. And the adjusting tank 24
When the water level of the stable muddy water in the inside falls to the lower limit, the control unit 40 opens the muddy water sending valve VO23 of the adjusting tank 23 to send out the stable muddy water. As a result, the role of the adjusting tank 23 is
Switching from waiting after stable mud adjustment to sending stable mud.

In the adjusting tank 22, a predetermined amount of diluting water or mud is added to the discharged mud water (cyclone over mud), and stirring is carried out by the stirring blades provided inside the adjusting tank and the aforementioned stirring pump P4. Done. As a result, the discharged mud water is adjusted to stable mud water having a predetermined specific gravity and viscosity.
Here, in order that the supply of stable muddy water to the machine 30 is not interrupted, it is necessary to finish the adjustment to stable muddy water in the adjusting tank 22 before the stable muddy water in the adjusting tanks 24 and 23 runs out. In the present embodiment, not only the stirring blade but also the stirring pump P4 is used to homogenize the muddy water, so that the stirring time is shortened and the time required for adjusting to stable muddy water is also shortened. Therefore, the apparatus according to the present embodiment can be applied to the excavator having a larger maximum required amount of mud than in the conventional case.
In addition, when the maximum required amount of mud water of the excavator 30 cannot be met even by shortening the stirring time by the stirring pump P4,
This can be handled by adding more adjusting tanks and increasing the number of adjusting tanks that store stable mud and stand by. Although not shown, each adjusting tank is provided with a sampling pump, which collects the muddy water in each adjusting tank and measures its specific gravity and viscosity. When the control unit 40 detects that the muddy water in the adjusting tank 22 has a predetermined specific gravity and viscosity based on the measurement result, it determines that the adjustment to the stable muddy water is completed. As a result, the role of the adjusting tank 22 is
Switching from stable mud adjustment to standby after stable mud adjustment.

In the adjusting tank 21, the waste sludge treated as industrial waste out of the cyclone over sludge is sent to a sludge storage tank (not shown), and then the sludge storage valve VS21 is closed to store the reused cyclone over sludge. There is. Then, the control unit 40 closes the muddy water receiving valve VI21 and opens the adjusting valve VT21 at a predetermined amount when the role of the adjusting tank 24 is switched from the stable mud sending to the cyclone over mud receiving as described above. Adjusting tank 2 for diluting water and mud
Feed to 1. As a result, the role of the adjusting tank 21 is switched from receiving cyclone over mud to adjusting to stable mud.

Although each of the adjusting tanks 21 to 24 operates as described above, focusing on one adjusting tank, the role of the adjusting tank is to receive cyclone over mud, adjust to stable mud, and wait after adjusting stable mud. Stable muddy water is sent out → Cyclone over muddy water is received, which switches sequentially and cyclically. By sequentially switching the role of the adjusting tank, each adjusting tank plays only one role at each time point (the adjusting tank becomes a single function). Therefore, since there is no inflow or outflow of the muddy water in the adjusting tank for adjusting the muddy water to the stable muddy water, it is possible to accurately adjust the muddy water to a predetermined specific gravity and viscosity. Further, the role of each adjusting tank is not fixed and is cyclically switched, so that it is possible to easily cope with a case where the amount of mud water required by the excavator 30 is temporarily increased. That is, in the above-described operation example, when the amount of muddy water supplied to the excavator 30 temporarily increases, the stable muddy water level in the adjustment tank 24 reaches the lower limit in a shorter time than usual, but At that point, the role should be switched to the delivery of stable mud. Since this switching is performed at an earlier time than usual, the adjusting tank that stores the adjusted stable mud and stands by does not exist temporarily, but if the amount of mud supplied to the excavator 30 decreases, 4 One of the base adjusting tanks can be put on standby.

By the way, at present, in the shield construction method, the excavator 30 is stopped for each constant excavation unit called a ring,
It has restarted after installing the outer frame segment of the tunnel. When the excavator 30 is stopped, the device of this embodiment operates as follows.

After stopping the excavator 30, first, in order to wash the inside of the excavator ring with stable mud, the mud water from the adjusting tank is continued for a predetermined time. Next, the first valve V1 provided on the mud water pipe 32 and the second valve V2 provided on the drain mud water pipe 34 are closed and the third valve provided on the bypass pipe 36 is closed.
Open the valve V3. As a result, after the mud water pipe 32 and the drain mud water pipe 34 are filled with stable mud water, the pumps P1 and P2 are
To stop. After that, when the excavator 30 is restarted, the first valves V1 and V2 are opened, the third valve V3 is closed, and the pumps P1 and P2 are operated.

In this way, the pump P is produced for each ring excavation.
By also stopping 1 and P2, pumps P1 and P
2 and the life of the mud water pipe 32 and the drain mud water pipe 34 can be extended as compared with the conventional case. Further, since the mud water pipe 32 and the drain mud water pipe 34 are filled with the stable mud water after the excavator 30 is stopped, the stable mud water can be immediately supplied to the excavator 30 when restarting.

As described above, the excavator 30 is currently stopped for each ring excavation, but the apparatus of this embodiment will be introduced in the future by increasing the number of adjusting tanks as necessary. It is also possible to cope with continuous excavation.

[0027]

As described above, according to the present invention,
Since there is no inflow or outflow of muddy water in the adjusting tank that adjusts to stable muddy water, it is possible to accurately adjust the muddy water to a predetermined specific gravity and viscosity. This ensures the stability of the face in the excavation portion. Further, since the stirring time is shortened by the stirring pump, the time required for adjusting to stable mud is also shortened, and it is possible to cope with a shield machine having a larger maximum required mud amount than the conventional one. Then, the role of each adjusting tank is not fixed and is cyclically changed, so that it is possible to easily cope with a temporary increase in the required amount of muddy water. Furthermore, since it is possible to accurately supply stable mud water adjusted to a specific gravity and viscosity to the shield machine, there is no need for sending and discharging mud water to prevent settling and siltation in the mud water pipe and drain mud pipe. With the stop of the shield machine for each ring excavation, the sent and discharged mud water can also be stopped. This extends the life of the pump, the mud water pipe, and the drain mud pipe.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a stable muddy water supply device for a shield machine, which is an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional stable mud water supply device for a shield machine (main part of a mud water treatment device).

[Explanation of symbols]

 12 ... Dewatering sieve 16 ... Wet cyclone 21-24 ... Adjusting tank 30 ... Shield excavator 32 ... Mud water pipe 34 ... Drainage mud pipe 36 ... Bypass pipe 40 ... Control unit (control means, mud discharge control means) P1 ... Muddy water pump P2 ... Discharged muddy water pump P4 ... Stirring pump S21 to S24 ... Liquid level gauge (detection means) VI21 to VI24 ... Muddy water receiving valve VO21 to VO24 ... Muddy water delivery valve V1 ... First valve V2 ... Second valve V3 ... Third valve

Claims (3)

[Claims] 1. A shield excavator via a mud water pipe after receiving drainage mud water generated by a shield excavator accompanied by excavated soil through a drainage mud pipe, a dehydration screen and a wet cyclone, and adjusting the specific gravity and viscosity to a predetermined value. In a stable muddy water supply device for a shield machine, which comprises an adjusting tank for sending back to, at least three adjusting tanks, a muddy water receiving valve provided between each adjusting tank and a drain mud pipe, each adjusting tank and mud sending A muddy water delivery valve provided between the water pipe, a detection means for detecting the amount of muddy water in each adjusting tank, and a first role of receiving the discharged muddy water by opening the muddy water receiving valve,
The second role of adjusting the received muddy water to a predetermined specific gravity and viscosity with the muddy water receiving valve and the muddy water delivery valve closed, and opening the muddy water delivery valve of stable muddy water adjusted to the predetermined specific gravity and viscosity. Control means for opening and closing the muddy water receiving valve and the muddy water sending valve based on the detecting means so that each adjusting tank sequentially and cyclically plays at least three roles of the third role of sending out to the mud sending pipe. A stable mud supply device for a shield machine, comprising: 2. A stable mud supply for a shield machine according to claim 1, wherein each adjusting tank is provided with a stirring pump for discharging the mud sucked from the bottom of the adjusting tank to the upper part of the adjusting tank. apparatus 3. A bypass pipe which is provided in the vicinity of the shield machine and which connects the mud water pipe and the waste water pipe, and is provided between the shield machine and the point where the bypass pipe is connected in the mud water pipe. The first valve, the second valve provided between the point at which the bypass pipe is connected in the drainage mud pipe and the shield machine, the third valve provided in the bypass pipe, and the mudwater pipe The mud water pump, the mud water pump provided in the mud water pipe, and the shield valve machine are stopped, and the first valve and the second valve are closed and the third valve is opened. 2. A shield excavator according to claim 1, further comprising: a sending and discharging mud water control unit that stops the mud sending pump and the drain mud pump after filling with the stable mud water adjusted to have a predetermined specific gravity and viscosity. Cheap Constant mud supply device.