JPH0638328A - Supervisory system for cable laying work - Google Patents

Abstract

PURPOSE:To realize efficient cable laying work in safety with reduced manpower. CONSTITUTION:In a cable laying work for hauling and laying a cable 1 through hauling machines arranged at 80 appropriate interval in the cable laying direction, an abnormality detector 3 fixed to each hauling machine 2 detects abnormal hauling force, abnormal speed, positional shift, or the like of the cable 1 at the time of laying cable. Upon detection of abnormality through any one detector, all hauling machines 2 are stopped and laying conditions are photographed by means of an ITV camera 5 installed in a culvert 4 and monitored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The cable laying work monitoring method of the present invention is used to automatically monitor the laying condition of a cable such as a power cable when laying it in a cave.

[0002]

2. Description of the Related Art Conventionally, there is a method shown in FIG. 6 as one of the methods for laying a cable such as a power cable in a cave. In this, a cable B is pulled out from a cable drum A installed on the ground, the cable B is guided by a large number of guide rollers C arranged along a laying route, and the holing machine D pulls the cable B in a manhole E, It is designed so that it can be mechanically laid in the underground cave F. In this case, the worker G, who is placed on the ground, in the manhole E, and in various places in the cave F, is proceeding with the laying work while monitoring the cable laying status.

As shown in FIG. 7, the holing machine D is a device capable of sandwiching the cable B by two opposing take-up belts J and sending it out, and is attached to several places in the manhole E on the ground. All the holing machines D are turned on simultaneously by the controller H
It can be turned off.

While the cable B is towed and laid by the holing machine D, one of the workers G detaches the cable B from the roller or the cable B is towed by the holing machine D due to an abnormal load. The cable B that is slipping, bending, twisting,
When an abnormality such as swinging up or down or damage to the cable B was found, the nearest controller H was operated to stop all the holing machines D, and the worker G near the site caused the abnormality. The place is inspected, the cause is removed, and then the controller H is operated to operate the holing machine D, and the work is restarted.

[0005]

However, the conventional cable monitoring method in the cable laying work has the following problems. It is necessary to arrange a worker G for monitoring the laying status of the cable B at several places on the ground, in the manhole E, and in the cave F. As a result, the number of workers G increases and the labor cost increases. , Which was one of the causes of the increase in cable installation costs. Since the worker G visually monitors the delivery status of the cable B, the worker G may overlook the abnormality of the cable B, and the cable B may be damaged in some cases. Numerous workers G in narrow manhole E and cave F
The worker G stumbles on the cable B, the guide roller C, the holing machine D, etc., or the hand or finger is caught by the hauling machine D's take-up belt, which may cause injury. Accidents were likely to occur, and it was very dangerous.

An object of the present invention is to provide a method for monitoring cable laying work which enables the cable laying work to be performed efficiently and safely with a small number of personnel.

[0007]

As shown in FIG. 1, the method for monitoring cable laying work according to the present invention is to pull the cable 1 by a holing machine 2 arranged at appropriate intervals in the laying direction of the cable 1. In the cable laying work, an abnormality at the time of laying is detected by an abnormality detection sensor 3 for detecting a pulling force abnormality, a speed abnormality, a positional deviation, etc. of the cable attached to each holing machine 2, and an abnormality is detected by one of the abnormality detection sensors 3. All of the holing machines 2 are stopped when detected, and the installation condition is photographed by the ITV camera 5 provided in the cave 4 and can be monitored by a monitor.

[0008]

In the method for monitoring cable laying work according to the present invention, when abnormalities such as traction force abnormality, speed abnormality, positional deviation, etc. occur in the holing machine 2 and the cable 1 during cable laying,
It is detected by the abnormality detection sensor 3 and the operation of all the holing machines 2 is stopped. In addition, the ITV camera 5 and the monitor TV 1 can be used to check the condition inside the cave 4 and the cable installation condition
Since it is possible to monitor by means of 8, it is possible to immediately operate the control device 9 and stop all the holing machines 2 when an abnormality is confirmed in the monitor TV 18. For this reason, no abnormalities are overlooked, and there is no need to place workers in the narrow and dangerous cavern 4 during the construction work.
It's also safe.

[0009]

FIG. 1 shows an embodiment of a method for monitoring cable laying work according to the present invention. Reference numeral 1 shown in the figure is a cable such as a power cable, which is wound around a cable drum 10 installed on the ground. Then, the cable 1 drawn out therefrom is introduced into the manhole 11 and the cave 4 along a laying line formed by a number of guide rollers (not shown), and arranged at appropriate intervals along the laying line. Underground cave 4 towed by a moving holing machine 2
It is designed to be sent to the back.

As shown in FIG. 2, the holing machine 2 has two take-up belts 23 arranged on both sides of the cable 1, and each take-up belt 23 has a drive roller 21 rotated by a motor 24 and a pair thereof. Rotating roller 17
It is composed of a pair of rollers 21 and 17 and an endless belt 20 hung between the rollers. When the drive roller 21 is rotated by the motor 24 in the arrow direction, the cable 1 sandwiched between the two belts 20 is pulled and sent in the arrow direction in the figure. The holing machine 2 can be remotely controlled by the control device 9 installed in the office 8. By operating the operation panel 16 of the control device 9, all the holing machines 2 can be turned ON / OFF at once.

Further, the holing machine 2 is also provided with an abnormality detection sensor 3 for detecting an abnormality in the traction force (tension) of the cable 1, an abnormality in the speed, an abnormality in the cable deviation, an abnormality in the current of the motor 24, and an abnormality in the voltage of the motor 24. Although details of the abnormality detection sensor 3 will be described later, the sensor 3
The various detection signals detected by the are sent to the monitoring device 6 (FIG. 5) provided in the control device 9 of the holing machine 2 installed in the office 8, and the detection signals processed here are displayed lamps and digital signals. Displayed as traction force, take-up belt speed, cable speed, cable error, mortal error. When a fault occurs further, a lamp for identifying the faulty holing machine 2 lights up on the alarm indicator 19 as a warning.

In addition, a large number of ITVs are installed on the ceiling of the cave 4.
The cameras 5 are attached at appropriate intervals along the laying route of the cable 1. The video of this ITV camera 5 is also office 8
The image is displayed on a TV monitor 18 provided inside, and a desired image of the ITV camera 5 can be monitored by switching a switch or the like.

Here, the abnormality detecting sensor 3 is the cable 1
Traction force (tension) abnormality, speed abnormality, cable deviation abnormality,
2 to 4 show examples of a current abnormality and a voltage abnormality of the motor 24, of which a traction force (tension) abnormality of the cable 1, a speed abnormality, and a cable deviation abnormality are detected. The current abnormality and voltage abnormality of the motor 24 are not shown because they can be easily detected by the current and voltage flowing through the motor 24. The indicator lamp to notify the abnormality of the motor is turned on.

Reference numeral 30 in FIG. 2 is a tension detecting sensor for detecting the tension applied to the cable 1. This is because the fixed frame 40 of the holing machine 2 (fixed to a cave, a manhole, etc.) and the movable frame 41 supporting the take-up belt 23 are separated so that the take-up belt 23 and the cable 1 move the frame during towing. The strain sensor 42 mounted between the frames 40, 41 detects that 41 is pushed in the Y direction in the figure, so that the tension applied to the cable 1 can be detected.

Reference numeral 31 in FIG. 3 is a position shift detection sensor for observing an abnormal cable shift in the vertical direction of the cable 1.
This is the top and bottom 2 of the tower 43 attached to both sides of the cable 1.
Two pairs of the light emitting element 44 and the light receiving element 45 are attached to the position. When the cable 1 is displaced in the vertical direction and the light output from the upper or lower light emitting element 44 is blocked, the opposite light receiving element 45 is Is detected and a position shift signal can be output. The heights of the light emitting element 44 and the light receiving element 45 can be set to desired heights by turning knobs 46, respectively, and the range of positional deviation can be defined by this adjustment. It should be noted that this displacement detection sensor 3
1, photoelectric switch, laser displacement meter, proximity switch (eddy current type), camera type, ultrasonic type displacement sensor,
Limit switches, vibration sensors, etc. can also be used.

Reference numeral 32 in FIG. 4 is a speed detecting sensor for measuring the moving speed of the cable 1. This depends on the rotation speed of the rotation detector 50 attached to the take-up belt 23.
The speed of the take-up belt 23
The movement speed of the cable 1 can be detected by the rotation speed of the rotation detector 49 of the second take-up belt 48 provided in front of. Among these, the moving speed of the cable 1 detected by the rotation detector 49 is compared with the moving speed of the cable 1 detected by each holing machine 2, and the moving speed between the holing machines 2 is caused due to bending of the cable 1 on the way. , The cable abnormality lamp of the monitoring device 6 is turned on. As the speed detection sensor 32, a mark detection method, a corrugated detection method, a photoelectric switch, a laser switch, an ultrasonic sensor, a rotary encoder, a tachogenerator, or the like can be used.

[0017]

In the method for monitoring cable laying work according to the present invention, the abnormality detection sensor 3 provided on the holing machine 2 monitors the cable 1 for abnormalities such as traction force abnormality, speed abnormality, positional deviation, etc. Since the condition of the inside of the road 4 and the cable laying condition are monitored, it is possible to significantly reduce the number of personnel for monitoring, which also reduces the human danger in the cavern 4 during the laying work. . Even if the abnormality is smaller, the abnormality detection sensor 3 detects it without leaking it and stops the holing machine 2. Therefore, it is possible to prevent the occurrence of an accident in which the cable 1 is damaged.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a method for monitoring cable laying work according to the present invention.

FIG. 2 is a side view showing an example of a tension detection sensor in the method for monitoring cable laying work according to the present invention.

FIG. 3A is a side view showing an example of a position shift detection sensor in the method for monitoring cable laying work according to the present invention;
(B) is a front view of (a).

FIG. 4 is a side view showing an example of a speed detection sensor in the method for monitoring cable laying work according to the present invention.

5 is a schematic diagram showing an example of a monitoring device in the method for monitoring cable laying work in FIG. 1. FIG.

FIG. 6 is a schematic diagram showing an example of a conventional cable laying construction monitoring method.

FIG. 7 is a schematic view showing an example of a holing machine.

[Explanation of symbols]

 1 Cable 2 Holing Machine 3 Abnormality Detection Sensor 4 Cave 5 ITV Camera

Claims (1)

[Claims] 1. In a cable laying work in which a cable 1 is towed by a holing machine 2 arranged at appropriate intervals in the laying direction of the cable 1, an abnormality in the laying is caused by an abnormal pulling force of the cable attached to each holing machine 2. , The abnormality detection sensor 3 for detecting a speed abnormality, a positional deviation, etc., and when any one of the abnormality detection sensors 3 detects an abnormality, all the holing machines 2 are stopped. I installed on the road 4
A method for monitoring cable laying work, characterized in that it can be photographed by the TV camera 5 and can be monitored by a monitor.