JP2973282B2 - Operation mode control method for 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 controlling an operation mode of a muddy water transport facility in a muddy water shield construction method used for construction of a submarine tunnel, and relates to a control method when the operation mode shifts from a face holding operation mode to a bypass operation mode. Things.

[0002]

2. Description of the Related Art FIG. 1 is a diagram showing a schematic configuration of a muddy water transporting facility of a muddy water shield method in a submarine tunnel construction or the like. 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. And a mud pump 4 for feeding mud water is arranged on the ground. These devices are connected by a mud water pipe 5 and a drain water pipe 6.

The muddy water pipe 5 and the muddy water pipe 6 are sequentially extended with the excavating movement of the excavator 1, and when the length becomes longer, a mud pump provided at the rear end of the excavator 1 as necessary. After 3, a mud pump and a mud pump are connected.

The valve system 2 includes a valve V1 connected in series to the muddy water pipe 5, a valve V2 connected in series to the muddy water pipe 6, and an excavation connected between the muddy water pipe 5 and the muddy water pipe 6. A valve V3 for bypassing the machine 1; and a control valve CV1 for controlling the face pressure in the face holding operation mode and the bypass operation mode. The control valve CV1 is connected to the control switch 13 and is controlled by the face pressure controller 8 as described later. Controlled. The valves V1, V2, and V3 are controlled by a valve system control device (not shown).

[0005] The sludge pump 3 is controlled by a sludge flow controller 12 via a rotation speed controller 14, and the sludge flow controller 12 has an output of a sludge flow detection sensor 11 provided in the sludge water pipe 6. Is entered. The face pressure detecting sensor 7 for detecting the face pressure of the excavator 1 is connected to a face pressure controller 8, and the output of the face pressure controller 8 is connected to a control switch 13. The mud pump 4 is connected to a control switch 13 via a rotation speed controller 15. The output of a mud pressure sensor 9 for detecting the mud pressure provided in the mud pipe 5 is input to a mud pressure controller 10.

In the above-mentioned muddy water transport equipment, usually, a face holding operation mode, a bypass operation mode, an excavation operation mode,
The operation is switched to the bypass operation mode and the face holding operation mode to perform tunnel excavation work. The transition from the face holding operation mode to the bypass operation mode starts from the following state. In the face holding operation mode, the control switch 13 is switched to the b side, and the valve system 2
The valve V3 is fully opened, the valves V1 and V2 are fully closed, the sludge pump 4 and the sludge pump 3 are stopped, and the control valve CV1 is controlled so that the face pressure is constant.

At the time of shifting from the above state to the bypass operation mode, first, the sludge pump 4 is operated at the minimum speed, and the sludge pump 3 is operated at the minimum speed. Next, the sludge pressure controller 1
Numeral 0 reads the mud feeding pressure detected by the mud feeding pressure detecting sensor 9 and controls the operation of the mud feeding pump 4 via the rotation speed controller 15 so that the mud sending pressure becomes a set mud sending pressure value (constant pressure). . Subsequently, the sludge flow controller 12 reads the sludge flow rate detected by the sludge flow rate detection sensor 11 and discharges the sludge flow rate via the rotation speed controller 14 so as to become a set sludge flow rate (constant flow rate). The operation of the mud pump 3 is controlled. During this transition, the face pressure constant control by the control valve CV1 continues.

[0008]

The mud pressure before operation of the mud pump 4 is the natural pressure at the depth of the shaft at the tunnel construction site, and the set mud pressure value during operation of the mud pump 4 is natural. When the pressure is lower than the pressure value, the pressure of the sludge must be reduced by the flow rate of the sludge from the sludge pump 3. When the constant mud pressure control of the mud pump 4 and the constant flow control of the mud pump 3 are performed by the above-described conventional control method for shifting from the face holding operation mode to the bypass operation mode, the natural pressure of the mud pump 4 is reduced. Since the pressure is high, the mud pump 4 is instructed to lower in a state where the actual mud pressure PV is higher than the set mud pressure SV (PV> SV). I have.

Since the sludge pump 3 starts from a state where the sludge flow rate value is 0, the rotation speed of the sludge pump 3 increases when PV <SV, but the rotation speed of the sludge pump 4 does not increase. The pump 3 balances before reaching the set value. That is, the flow rate becomes equal to or less than the set value at the rotation speed of the mud pump 4 of X% and the rotation speed of the sludge pump 3 at 100%. In this state, there has been a problem that it is impossible to shift to the next operation mode, that is, the excavation operation mode, and the operation cannot be performed originally.

In order to solve the above-mentioned problem, the rotation speed of the sludge pump has conventionally been forcibly increased by manual switching at the time of shifting, but the shifting operation becomes complicated or the sludge pump 4 is forcibly forced. When the number of revolutions is increased, there is a problem that a dangerous situation occurs such that disturbance is applied to the face pressure and the face pressure increases or fluctuates.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and is an operation mode of a muddy water transport facility in a muddy shield construction method system in which a transition from a face holding operation mode to a bypass operation mode can be smoothly and automatically performed in a short time. It is to provide a control method.

[0012]

In order to solve the above-mentioned problems, the present invention provides an excavator, a mud pump for sending muddy water to the excavator,
A mud pump for discharging mud from the excavator, a valve system for sending and discharging mud to the excavator, and a mud pump for connecting these, and a mud pipe and a mud pipe connected to the excavator. In the control method of the muddy water transport equipment operation mode in the muddy water shield method that is switched to the bypass operation mode, the excavation operation mode, and the bypass operation mode, when shifting from the face holding operation mode to the bypass operation mode, the set sludge discharge flow rate of the sludge pump. Is increased at a constant speed, the operation of the sludge pump is controlled based on the set sludge flow rate, and the set sludge pressure of the sludge pump becomes Nth power in synchronization with the sludge flow rate of the sludge pump. The operation of the mud pump is controlled based on the set mud pressure.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The muddy water transport equipment of the muddy water shield construction method system that implements the muddy water transport equipment operation mode control method of the present invention is the same as that shown in FIG.

When shifting from the face keeping operation mode to the bypass operation mode, first, the control switch 13 is switched to the b side, the mud pump 4 is operated at the minimum speed, and then the sludge pump 3 is operated at the minimum speed. . The output of the sludge pressure detection sensor 9 and the sludge flow rate detection sensor 11 when the sludge pump 4 and the sludge pump 3 are operated at the minimum number of rotations are provided. Is read, and the mud sending pressure value and the sludge flow rate value are stored.

Next, as shown in FIG. 2A, the set sludge flow rate SQ of the sludge flow controller 12 is changed by the sludge pump 4 and the sludge pump 3 stored in the sludge flow controller 12, as shown in FIG. Actual sludge flow rate PQ1 at minimum rotation speed (= predetermined sludge flow rate SQ
1) Change to a final set sludge flow rate SQ2 at a more constant speed, and the sludge flow controller 12 controls the operation of the sludge pump 3 based on the set sludge flow rate SQ.

At the same time, as shown in FIG. 2 (b), the set sludge pressure SV of the sludge pressure controller 10 is changed to the minimum rotation of the sludge pump 4 and the sludge pump 3 stored in the sludge pressure controller 10. Actual mud pressure PVI at several hours (= set mud pressure SV
1) Synchronize with the mud pump 3 to increase the Nth power characteristic (2
Power characteristic) to change to the final set mud pressure SV2,
The sludge pressure controller 10 controls the operation of the sludge pump 4 based on the set sludge pressure value SV. When the actual sludge flow PQ becomes the final set sludge flow SQ2 and the actual sludge pressure PV becomes the final set sludge pressure SV2, the transition from the holding operation mode to the bypass operation mode is completed.

As described above, the set sludge flow rate SQ of the sludge pump 3 is increased at a constant speed as shown in FIG. 2A, and the operation of the sludge pump 3 is controlled based on the set sludge flow rate SQ. In addition, the set mud pressure SV of the mud pump 4 is shown in FIG.
As shown in (b), the N-th characteristic is obtained in synchronization with the flow rate of the sludge pump 3 and the operation of the sludge pump 4 is controlled based on the set sludge pressure SV. Is controlled prior to the mud pressure control of the mud pump 4, so that the vertical shaft depth is large and the natural pressure is high as in the prior art, and the set mud pressure SV of the mud pump 4 is the natural pressure. If it is lower, the actual mud pressure PV before operation of the mud pump 4 is larger than the set mud pressure SV (PV> SV).
In this state, since the rotation speed of the mud pump 4 does not increase, the mud pump 3 does not reach the set value and does not balance, and the transition from the face holding operation mode to the bypass operation mode is automatically shortened. It can be done smoothly in time.

[0018]

As described above, according to the present invention, when shifting from the face holding operation mode to the bypass operation mode, the set sludge flow rate of the sludge pump is increased at a constant speed.
The operation of the sludge pump is controlled based on the set sludge flow rate, and the set sludge pressure of the sludge pump is set to have an Nth power characteristic in synchronization with the sludge flow rate of the sludge pump. Since the operation of the mud pump is controlled based on the pressure, the following excellent effects can be obtained.

(1) In the conventional transition method, the rotational speed of the mud pump is manually forcibly increased at the time of transition, but in the present invention, the transition control can be automatically performed.

(2) In the conventional transition method, when the rotation speed of the mud pump is forcibly increased without corresponding to the above (1), disturbance is applied to the pressure of the face, which is dangerous for the face such as pressure rise or sudden change. In some cases, such a problem is eliminated in the present invention.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a mud shield construction method system for implementing a mud transport facility operation mode control method of the present invention.

FIG. 2 is a diagram showing set values of a sludge pump and a sludge pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator 2 Valve system 3 Mud pump 4 Mud pump 5 Mud water piping 6 Mud water piping 7 Face pressure detection sensor 8 Face pressure controller 9 Mud pressure detection sensor 10 Mud pressure controller 11 Mud flow detection sensor 12 Sludge flow controller 13 Control switch 14 Speed controller 15 Speed controller

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shigeo Takita 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Corporation (72) Inventor Makoto Morikawa 111-1 Haneda Asahi-cho, Ota-ku, Tokyo Shares Inside Ebara Corporation (72) Inventor Akira Tanokura 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Electric Corporation (72) Inventor Kazuhisa Watanabe 111-1 Asahi-cho Haneda, Ota-ku, Tokyo Ebarapu (56) References JP-A-3-129909 (JP, A) JP-B 61-5217 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9 / 06 301

Claims (1)

(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. Equipped with mud water pipe and drain water pipe, the operation mode is face holding operation mode, bypass operation mode,
In the muddy water transport equipment operation mode control method in the muddy water shield construction method system, which is switched between the excavation operation mode, the bypass operation mode, and the face holding operation mode, when the transition from the face holding operation mode to the bypass operation mode is performed, the set sludge pump is used. The flow rate is increased at a constant rate,
The operation of the sludge pump is controlled based on the set sludge flow rate, and the set sludge pressure of the sludge pump is adjusted to the flow rate / head characteristics of the sludge pump in synchronization with the sludge flow rate of the sludge pump. A method for controlling the operation of a muddy water transport facility in a muddy water shield construction method, wherein the muddy water pump has an Nth power characteristic and the muddy water pump is operated and controlled based on the set muddy pressure.