JP2802983B2 - Ventilation equipment in tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilating device in a tunnel for ventilating a tunnel under construction.

[0002]

2. Description of the Related Art Conventionally, ventilation in a tunnel pit, especially during tunnel construction, is performed continuously by using a contra fan or the like. Adjusting and ventilating; operating a ventilation fan according to a predetermined operation pattern; adjusting the number of rotations of the fan;

[0003]

In the above, since the number of revolutions of the fan cannot be adjusted steplessly, excessive operation must be performed despite good ventilation in the mine, resulting in waste of power consumption. .

In such a case, it is necessary for a person to adjust the number of revolutions of the fan, and ventilation is started after detecting deterioration of the environment.

[0005] Then, the work time often shifts depending on the type of construction, and as a result, it may not match the determined operation pattern.

In the above, since a person performs a visual inspection,
Checks such as breakage of the wind tube side are missing and it takes time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a ventilation device in a tunnel which solves the above-mentioned disadvantages of the prior art, can quickly cope with the deterioration of the working environment, and can automatically perform appropriate control without any trouble. It is in.

[0008]

In order to achieve the above object, the present invention provides a sensor for predicting the generation of dust in addition to a sensor for measuring the underground environment, and outputs the outputs of these sensors to a command circuit in a control panel. The command circuit determines a rotational speed command to the ventilation fan drive unit based on these sensor outputs, or, in addition to this configuration, a sensor for predicting dust generation is provided by a sound pressure level meter or the like. It consists of a blast detection sensor and a spray detection sensor such as a truck mixer pit detection sensor, or a wind-leak detection sensor with this wind tube connected to a ventilation fan and its end led out of the tunnel The point is that the output of the leak detection sensor is also introduced into the command circuit.

[0009]

According to the present invention, the deterioration of the environment is predicted in advance by the sensor for predicting the generation of dust, so that it is possible to quickly respond to the deterioration of the working environment, and to automatically rotate according to the degree of deterioration of the environment such as the amount of dust. Since the number is controlled, it can be operated efficiently. In addition, since the leak detection is automatically performed by the leak detection sensor, there is no need for a person to check the wind duct.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a ventilation device in a tunnel according to the present invention, FIG. 2 is a vertical side view at the time of blasting, and FIG. 3 is a vertical side view at the time of concrete spraying operation.

In FIG. 1, reference numeral 1 denotes a ventilation fan driven by a motor 2. The fan 1 is provided on a fan base 3, and a wind tube 4 is connected. The end of the wind tube 4 is led out of the tunnel. . The fan 1 is inverter-controlled by a motor 2 constituting a drive unit and an inverter 5 for controlling the number of revolutions of the motor. A control panel 6 has an inverter 5 and a command circuit 7 for sending a number-of-revolutions command signal to the inverter 5. Is formed.

In the drawing, reference numeral 8 denotes a centr as a sliding form for placing concrete, and reference numeral 9 denotes concrete.

The present invention relates to a measurement sensor 10 for an underground environment,
A dust meter, a gas sensor, a thermometer, and a hygrometer were provided, and the measurement output of the measurement sensor 10 in the underground environment was introduced into the command circuit 7.

An anemometer, a differential pressure gauge, a pitot tube, and the like are provided as the air leak detection sensor 11 in the wind tube 4. In the case of an anemometer, these are provided at two locations on the inside of the wind tube 4 and on the pit side. The presence or absence of air leakage shall be determined based on the difference. The detection output of the leak detection sensor 11 is also introduced into the command circuit 7.

Further, there is provided a sensor for predicting the generation of dust, comprising a blast detection sensor 12 and a spray detection sensor 13. Of these, the blast detection sensor 12 is provided by a sound pressure meter, a vibration meter, a noise meter, an accelerometer, or the like. Become.

On the other hand, the spray detection sensor 13 is based on a tramiki (truck mixer) entry detection sensor 13a, a pump car or a spray machine movement detection sensor 13b. Only one of these may be used.

As shown in FIGS. 4 and 5, for example, as shown in FIGS.
A magnetic sensor 16 using a Hall element or the like corresponding to the magnet 15 in the fan base 3 through which the track mixer 14 passes, and an amplifier 17 connected to the magnetic sensor 16.
Further, a controller 18 connected to the amplifier 17 is provided, and a tramiki detection signal from the controller 18 is introduced to the control panel 6.

As another embodiment, it is conceivable that the Toramiki entrance detection sensor 13a is constituted by a remote card, an optical sensor, or the like.

The pump car and spraying machine movement detection sensor 13b is a sensor for detecting the closing of the equipment circuit of the pump car 20 attached to the concrete spraying machine 19.

The outputs of the blast detection sensor 12 and the spray detection sensor 13 are also introduced into the command circuit 7.

The command circuit 7 determines a rotational speed command to the fan drive unit based on these sensor outputs. Next, an example in which the usage and operation are applied to NATM tunnel construction will be described.

First, regarding the blasting operation, when there is blasting, the blasting detection sensor 12 detects this and outputs it to the command circuit 7, and the command circuit 7 sets the rotation speed of the fan 1 to a set value as shown in FIG. The output is output to the inverter 5 so as to raise the motor 2, and the inverter 5 performs the inverter control of the motor 2.

For the set time (T), this number of rotations is held,
(T) After the lapse of time, the dust concentration is detected by the measurement sensor 10 in the underground environment, and the rotation speed of the fan 1 follows the dust concentration.

Thereafter, the rotation speed of the fan 1 decreases, and is reduced to the set rotation speed.

Next, with regard to the spraying operation, when the truck mixer 14 enters the mine, the Toramiki entering detection sensor 13a detects this and outputs it to the inverter 5 so as to increase the rotation speed of the fan 1 to a set value. The inverter 5 controls the motor 2 with an inverter.

For the set time (T), this number of rotations is held,
(T) After the lapse of time, the dust concentration is detected by the measurement sensor 10 in the underground environment, and the rotation speed of the fan 1 follows the dust concentration.

Thereafter, the rotation speed of the fan 1 decreases, and is reduced to the set rotation speed.

If the air duct 4 is torn, the air leak detection sensor 11 may detect this and increase the rotation speed of the fan 1 and issue an alarm.

[0029]

As described above, the ventilation device in a tunnel according to the present invention can quickly cope with the deterioration of the working environment by predicting the deterioration of the environment such as dust generation in advance, and furthermore, the deterioration of the environment such as the amount of dust. Since the number of rotations of the fan is automatically controlled in accordance with the degree, the operation can be efficiently performed, and appropriate control can be performed without trouble. Further, since the leak detection is performed automatically, the inspection work by a person is not required.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a ventilation device in a tunnel according to the present invention.

FIG. 2 is a vertical sectional side view of the ventilation device in a tunnel according to the present invention when it is blasted.

FIG. 3 is a vertical sectional side view of a ventilation device in a tunnel of the present invention during a concrete spraying operation.

FIG. 4 is a vertical sectional front view showing the installation of the Toramiki entrance detection sensor.

FIG. 5 is an explanatory diagram of a Toramiki entrance detection sensor.

FIG. 6 is a graph showing an operation example of a fan.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fan 2 ... Motor 3 ... Fan stand 4 ... Wind tube 5 ... Inverter 6 ... Control panel 7 ... Command circuit 8 ... Centre 9 ... Concrete 10 ... Underground environment measurement sensor 11 ... Leakage detection sensor 12 ... Blast detection sensor 13 … Blow detection sensor 13a… Trumiki pit detection sensor 13b… Pump car and spray machine movable detection sensor 14… Truck mixer 15… Magnet 16… Magnetic sensor 17… Amplifier 18… Controller 19… Concrete spray machine 20… Pump car

Continuation of the front page (72) Inventor Motohisa Okamoto 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) References JP-A-2-70900 (JP, A) (58) Survey Field (Int.Cl. ⁶ , DB name) E21F 1/00

Claims (3)

(57) [Claims] 1. A sensor for predicting the generation of dust is provided in addition to a measurement sensor for an underground environment, and the outputs of these sensors are introduced into a command circuit on a control panel, and the command circuit ventilates based on these sensor outputs. A ventilation device in a tunnel, which determines a rotation speed command to a fan drive unit for a vehicle. 2. A ventilating device in a tunnel according to claim 1, wherein the sensors for predicting the generation of dust include a blasting detection sensor such as a sound pressure level meter and a blowing detection sensor such as a truck mixer pit detection sensor. 3. An air flow tube connected to a ventilation fan and having an end led out of the tunnel is provided with a leak detection sensor for the wind tube, and the output of the leak detection sensor is also introduced into the command circuit. The ventilation device in a tunnel according to claim 2.