JPS6056873B2 - Tuning machine face water pressure control device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a control device for water pressure at a face of an excavator.

Conventionally, the water pressure at the face has been maintained by controlling the water supply by manual valve operation or by controlling the rotation of the water supply pump, but the former method requires manual labor, and the latter has the disadvantage of causing a time lag in water supply.

It is an object of the present invention to eliminate the drawbacks of the conventional devices as described above and to provide a device that can control face water pressure without causing a time lag.

To achieve the above objects, the present invention includes a water pipe that supplies water to a hydraulic chamber, and a drainage pipe that discharges earth and sand excavated at a face in front of the hydraulic chamber to the outside from the hydraulic chamber together with the water. (a) a buffer tank disposed in the water pipe and having a drain pipe, an air supply pipe, and an exhaust pipe; (b) a water level detector disposed in the buffer tank; and (c)
a water level controller that opens and closes a control valve of the drain pipe to adjust the water level of the buffer tank according to a detection result of the water level detector;
) a water supply pressure transmitter disposed in the water supply pipe between the buffer tank and the water pressure chamber; and (e) a water supply pressure transmitter disposed in the water supply pipe between the buffer tank and the water pressure chamber; An apparatus for controlling water pressure at a face of an excavator, characterized by comprising an air pressure regulator that opens and closes a control valve to adjust the pressure of water sent out from the buffer tank.

An embodiment shown in the drawings will be described below.

A water pressure chamber 3 is provided at the front end of the shield tunneling machine 1 by a bulkhead 2.
is formed, one end of each of a water pipe 4 equipped with a water supply pump P1 and a sludge drainage pipe 5 equipped with a sludge pump P2 are opened in this water pressure chamber 3, and the other ends of each of the pipes 4 and 5 are installed on the ground. It opens into a water storage tank (not shown). The water pipe 4 is provided with a sealed buffer tank 7, and the water flowing through the water pipe 4 flows through this buffer tank 7.
An air supply pipe 8 with a control valve 15 and an exhaust pipe 9 with a control valve 16 are provided in the upper part of the buffer tank 7, and a drain pipe 18 with a control valve 20 is provided in the lower part. ing.

The water supply pipe 4 between the water pressure chamber 3 and the buffer tank 7 is provided with a water supply pressure transmitter 27 that detects the water supply pressure and outputs a pressure signal. This air pressure regulator 30 is connected to the control valve 15.
, 16 by signal lines. When the air pressure regulator 30 is set to a predetermined pressure value and receives a pressure signal from the water pressure transmitter 27, it compares this pressure signal with the set pressure and outputs a signal if there is a deviation between the two. This output signal is input to the control valves 15 and 16, which open and close the control valves 15 and 16 to adjust the air pressure, that is, the water pressure in the buffer tank 7. The buffer tank 7 is provided with a water level detector 17 that detects the water level inside the tank and outputs a signal. The detector 17 is connected to a water level controller 19 by a signal line, and this water level controller 19 is connected to a control valve 20 and a water pump P1 by a signal line.

When the water level regulator 19 receives the signal from the water level detector 17, it outputs a signal, and this output signal is input to the control valve 20 or the water pump P1 to adjust the water level in the buffer tank 7. It's summery. A bypass pipe 26 connects the water pipe 4 and the mud removal pipe 5, and is provided with a valve 29.

Next, the operation of the above will be explained.

When the face water pressure increases, the water supply pressure within the water pipe 4 increases accordingly.

When the water pressure transmitter 27 detects this, the signal is input to the pneumatic pressure regulator 30, and if there is a deviation between the input signal and the set pressure, the pneumatic pressure regulator 30 sends a signal to the control valve 16 to adjust the corresponding pressure. The valve 16 is opened to exhaust air, and the air pressure inside the buffer tank 7 is reduced. That is, the water pressure in the buffer tank 7 decreases, and the water pressure in the water pipe 4 decreases to a predetermined pressure.
At the same time, when the face water pressure increases, the water level in the buffer tank 7 increases accordingly.

The water level detector 17 detects the water level and sends a signal to the water level controller 19.
0, the valve 20 is opened, and the water level in the buffer tank 7 is lowered to a predetermined water level. When the water pressure at the face increases in this way, the water level in the buffer tank 7 is lowered while exhausting the air in the buffer tank 7, thereby reducing the water pressure at the face to a predetermined pressure. .

When the face water pressure decreases, the water supply pressure of the water pipe 4 pressure decreases accordingly.

When the water pressure transmitter 27 detects this, the signal is input to the pneumatic pressure regulator 30, and if there is a deviation between the input signal and the set pressure, the pneumatic pressure regulator 30 sends a signal to the control valve 15 to adjust the corresponding pressure. The valve 15 opens to supply air, and the air pressure inside the buffer tank 7 increases. That is, the water pressure in the buffer tank 7 increases, and the water pressure in the water pipe 4 increases to a predetermined pressure.
At the same time, when the face water pressure decreases, the water level in the buffer tank 7 decreases accordingly.

The water level detector 17 detects the water level and sends a signal to the water level controller 19, and the water level controller 19 sends a signal to the water pump P1 to operate its variable speed mechanism 21 to increase the water flow and buffer the water. The water level in tank 7 is raised to a predetermined level. When the water pressure at the face falls in this way, the water level in the buffer tank 7 is raised while supplying air to the buffer tank 7, thereby raising the water pressure at the face to a predetermined pressure.

As described above, according to the present invention, when a fluctuation occurs in the water pressure at the face, the water supply pressure of the water pipe is changed to a predetermined pressure by supplying and exhausting air to the buffer tank, and at the same time, water is supplied to the buffer tank 7. Since water is supplied and discharged to maintain the water level at a predetermined level, the water pressure at the face can be returned to the predetermined pressure without any time lag, allowing safe tunnel construction.

In addition, since fluctuations in the water pressure at the face are detected by a water pressure transmitter installed in the water pipe, appropriate control can be performed without excessively responding to minute fluctuations in the water pressure at the face.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. 1... excavator, 2... bulkhead, 3...
...Water pressure chamber, 4...Water pipe, 5...Sludge removal pipe, 7...Buffer tank, 8...Air supply pipe, 9.
...Exhaust pipe, 15, 16...Control valve, 17
...Water level detector, 18...Drain pipe, 1
9...Water level controller, 20...Control valve, 2
7... Water pressure transmitter, 30... Air pressure controller, P1... Water pump, P2...
・Sludge pump.

Claims (1)

[Claims] 1. In an excavator equipped with a water pipe that supplies water to a water pressure chamber, and a mud removal pipe that discharges earth and sand excavated at a face in front of the water pressure chamber from the water pressure chamber to the outside together with the water (
a) a buffer tank disposed in a water pipe and having a drain pipe, an air supply pipe, and an exhaust pipe; (b) a water level detector disposed in the buffer tank; and (c) according to the detection results of the water level detector. a water level controller that opens and closes a control valve of the drain pipe to adjust the water level of the buffer tank; (d) a water pressure transmitter disposed in a water pipe between the buffer tank and the water pressure chamber; an air pressure controller that opens and closes a control valve of the air supply pipe and a control valve of the exhaust pipe in accordance with a detection result of a water pressure transmitter and a set pressure to adjust the pressure of water sent out from the buffer tank. A control device for water pressure at a face of an excavator.